Adding upstream version 6.1.22-dfsg.upstream/6.1.22-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

52 files changed, 31578 insertions, 0 deletions

diff --git a/src/VBox/HostDrivers/VBoxNetFlt/Makefile.kmk b/src/VBox/HostDrivers/VBoxNetFlt/Makefile.kmk
new file mode 100644
index 00000000..25772395
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/Makefile.kmk
@@ -0,0 +1,578 @@
+# $Id: Makefile.kmk $
+## @file
+# Sub-Makefile for the Network Filter Driver (VBoxNetFlt).
+#
+
+#
+# Copyright (C) 2008-2020 Oracle Corporation
+#
+# This file is part of VirtualBox Open Source Edition (OSE), as
+# available from http://www.virtualbox.org. This file is free software;
+# you can redistribute it and/or modify it under the terms of the GNU
+# General Public License (GPL) as published by the Free Software
+# Foundation, in version 2 as it comes in the "COPYING" file of the
+# VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+# hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+#
+# The contents of this file may alternatively be used under the terms
+# of the Common Development and Distribution License Version 1.0
+# (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+# VirtualBox OSE distribution, in which case the provisions of the
+# CDDL are applicable instead of those of the GPL.
+#
+# You may elect to license modified versions of this file under the
+# terms and conditions of either the GPL or the CDDL or both.
+#
+
+SUB_DEPTH = ../../../..
+include $(KBUILD_PATH)/subheader.kmk
+
+
+if1of ($(KBUILD_TARGET), darwin win) # this ifeq must go, see @todo around elif
+ #
+ # VBoxNetFlt.sys - The mixed case driver.
+ #
+ SYSMODS += VBoxNetFlt
+ VBoxNetFlt_TEMPLATE = VBOXR0DRV
+ VBoxNetFlt_INST = $(INST_VBOXNETFLT)$(if $(eq $(KBUILD_TARGET),darwin),Contents/MacOS/)
+ VBoxNetFlt_DEBUG_INST.darwin = $(patsubst %/,%,$(INST_VBOXNETFLT))
+ if defined(VBOX_SIGNING_MODE) && "$(KBUILD_TARGET)" == "win"
+  VBoxNetFlt_INSTTYPE = none
+  VBoxNetFlt_DEBUG_INSTTYPE = both
+ endif
+ VBoxNetFlt_DEFS = IN_RT_R0 IN_SUP_STATIC
+ VBoxNetFlt_INCS = .
+ VBoxNetFlt_SOURCES.darwin = \
+ 	darwin/VBoxNetFlt-darwin.cpp
+ VBoxNetFlt_SDKS.win = ReorderCompilerIncs $(VBOX_WINDDK_WLH) $(VBOX_WINPSDK)INCS
+ VBoxNetFlt_SOURCES.win = \
+ 	win/drv/VBoxNetFltP-win.cpp \
+ 	win/drv/VBoxNetFltM-win.cpp \
+ 	win/drv/VBoxNetFltRt-win.cpp \
+ 	win/drv/VBoxNetFlt-win.rc
+ # with WINDDKWLH the WIN9X_COMPAT_SPINLOCK is needed to avoid inline declaration of KeInitializeSpinLock
+ # otherwise the linker would complain about dumplicate _KeInitializeSpinLock@4 definition
+ # in ntoskrnl.lib and our object files
+ VBoxNetFlt_DEFS.win += WIN9X_COMPAT_SPINLOCK=1
+ VBoxNetFlt_DEFS.win += VBOXNETFLT_STATIC_CONFIG
+ VBoxNetFlt_DEFS.win += VBOXNETFLT_NO_PACKET_QUEUE
+ VBoxNetFlt_DEFS.win += NDIS_MINIPORT_DRIVER NDIS_WDM=1 BINARY_COMPATIBLE=0
+ VBoxNetFlt_DEFS.win += NDIS50_MINIPORT=1 NDIS50=1
+ ifdef VBOX_LOOPBACK_USEFLAGS
+  VBoxNetFlt_DEFS.win += VBOX_LOOPBACK_USEFLAGS
+ endif
+ VBoxNetFlt_SOURCES = VBoxNetFlt.c
+ #VBoxNetFlt_LDFLAGS.darwin = -v -Wl,-whyload -Wl,-v -Wl,-whatsloaded
+ VBoxNetFlt_LDFLAGS.win.x86 = -Entry:DriverEntry@8
+ VBoxNetFlt_LDFLAGS.win.amd64 = -Entry:DriverEntry
+ VBoxNetFlt_LIBS.win = \
+ 	$(PATH_SDK_$(VBOX_WINDDK_WLH)_LIB)/ntoskrnl.lib \
+ 	$(PATH_SDK_$(VBOX_WINDDK_WLH)_LIB)/hal.lib \
+ 	$(PATH_SDK_$(VBOX_WINDDK_WLH)_LIB)/ndis.lib \
+ 	$(PATH_SDK_$(VBOX_WINDDK_WLH)_LIB)/tdi.lib \
+ 	$(PATH_STAGE_LIB)/RuntimeR0Drv$(VBOX_SUFF_LIB)
+ VBoxNetFlt_LIBS = \
+ 	$(PATH_STAGE_LIB)/SUPR0IdcClient$(VBOX_SUFF_LIB)
+
+ darwin/VBoxNetFlt-darwin.cpp_DEFS = VBOX_SVN_REV=$(VBOX_SVN_REV)
+
+
+# Darwin extras.
+ifeq ($(KBUILD_TARGET),darwin)
+ INSTALLS += VBoxNetFlt.kext
+ VBoxNetFlt.kext_INST     = $(INST_VBOXNETFLT)Contents/
+ VBoxNetFlt.kext_SOURCES  = $(VBoxNetFlt.kext_0_OUTDIR)/Contents/Info.plist
+ VBoxNetFlt.kext_CLEAN    = $(VBoxNetFlt.kext_0_OUTDIR)/Contents/Info.plist
+ VBoxNetFlt.kext_BLDDIRS  = $(VBoxNetFlt.kext_0_OUTDIR)/Contents/
+
+$$(VBoxNetFlt.kext_0_OUTDIR)/Contents/Info.plist: $(PATH_SUB_CURRENT)/darwin/Info.plist $(VBOX_VERSION_MK) | $$(dir $$@)
+	$(call MSG_GENERATE,VBoxNetFlt,$@,$<)
+	$(QUIET)$(RM) -f $@
+	$(QUIET)$(SED) \
+		-e 's/@VBOX_VERSION_STRING@/$(VBOX_VERSION_STRING)/g' \
+		-e 's/@VBOX_VERSION_MAJOR@/$(VBOX_VERSION_MAJOR)/g' \
+		-e 's/@VBOX_VERSION_MINOR@/$(VBOX_VERSION_MINOR)/g' \
+		-e 's/@VBOX_VERSION_BUILD@/$(VBOX_VERSION_BUILD)/g' \
+		-e 's/@VBOX_VENDOR@/$(VBOX_VENDOR)/g' \
+		-e 's/@VBOX_PRODUCT@/$(VBOX_PRODUCT)/g' \
+		-e 's/@VBOX_C_YEAR@/$(VBOX_C_YEAR)/g' \
+		--output $@ \
+		$<
+
+ $(evalcall2 VBOX_TEST_SIGN_KEXT,VBoxNetFlt)
+
+ INSTALLS.darwin += Scripts-darwin
+ Scripts-darwin_INST = $(INST_DIST)
+ Scripts-darwin_EXEC_SOURCES = \
+ 	darwin/loadnetflt.sh
+endif # darwin
+
+
+ifeq ($(KBUILD_TARGET),win)
+ #
+ # Windows extras.
+ #
+ INSTALLS.win += VBoxNetFlt-inf
+ VBoxNetFlt-inf_TEMPLATE = VBoxR0DrvInfCat
+ VBoxNetFlt-inf_SOURCES = \
+ 	$(PATH_TARGET)/VBoxNetFltCat.dir/VBoxNetFlt.inf \
+ 	$(PATH_TARGET)/VBoxNetFltCat.dir/VBoxNetFltM.inf
+ VBoxNetFlt-inf_CLEAN = $(VBoxNetFlt-inf_SOURCES)
+ VBoxNetFlt-inf_BLDDIRS = $(PATH_TARGET)/VBoxNetFltCat.dir
+
+$(PATH_TARGET)/VBoxNetFltCat.dir/VBoxNetFlt.inf: $(PATH_SUB_CURRENT)/win/drv/VBoxNetFlt.inf $(MAKEFILE_CURRENT) | $$(dir $$@)
+	$(call MSG_GENERATE,VBoxNetFlt-inf,$@,$<)
+	$(call VBOX_EDIT_INF_FN,$<,$@)
+
+$(PATH_TARGET)/VBoxNetFltCat.dir/VBoxNetFltM.inf: $(PATH_SUB_CURRENT)/win/drv/VBoxNetFltM.inf $(MAKEFILE_CURRENT) | $$(dir $$@)
+	$(call MSG_GENERATE,VBoxNetFlt-inf,$@,$<)
+	$(call VBOX_EDIT_INF_FN,$<,$@)
+
+ ifdef VBOX_SIGNING_MODE
+VBoxNetFlt-inf_SOURCES += \
+	$(PATH_TARGET)/VBoxNetFltCat.dir/VBoxNetFlt.sys \
+	$(PATH_TARGET)/VBoxNetFltCat.dir/VBoxNetFltNobj.dll \
+	$(PATH_TARGET)/VBoxNetFltCat.dir/VBoxNetFlt.cat
+
+$(PATH_TARGET)/VBoxNetFltCat.dir/VBoxNetFlt.sys: $$(VBoxNetFlt_1_TARGET) | $$(dir $$@)
+	$(INSTALL) -m 644 $< $(@D)
+
+$(PATH_TARGET)/VBoxNetFltCat.dir/VBoxNetFltNobj.dll: $$(VBoxNetFltNobj_1_TARGET) | $$(dir $$@)
+	$(INSTALL) -m 644 $< $(@D)
+
+$(PATH_TARGET)/VBoxNetFltCat.dir/VBoxNetFlt.cat: \
+		$(PATH_TARGET)/VBoxNetFltCat.dir/VBoxNetFlt.sys \
+		$(PATH_TARGET)/VBoxNetFltCat.dir/VBoxNetFltNobj.dll \
+		$(PATH_TARGET)/VBoxNetFltCat.dir/VBoxNetFlt.inf \
+		$(PATH_TARGET)/VBoxNetFltCat.dir/VBoxNetFltM.inf
+	$(call MSG_TOOL,Inf2Cat,VBoxNetFlt-inf,$@,$<)
+	$(call VBOX_MAKE_CAT_FN, $(@D),$@)
+
+ endif # signing
+
+
+ #
+ # VBoxNetLwf.sys - The light-weight filter driver for NDIS6.
+ #
+ SYSMODS += VBoxNetLwf
+ VBoxNetLwf_TEMPLATE = VBOXR0DRV
+ VBoxNetLwf_INST = $(INST_VBOXNETFLT)
+ if defined(VBOX_SIGNING_MODE)
+  VBoxNetLwf_INSTTYPE = none
+  VBoxNetLwf_DEBUG_INSTTYPE = both
+ endif
+ VBoxNetLwf_DEFS = IN_RT_R0 IN_SUP_STATIC
+ VBoxNetLwf_INCS = .
+ VBoxNetLwf_SOURCES = VBoxNetFlt.c VBoxNetFlt.rc
+ VBoxNetLwf_SDKS.win = ReorderCompilerIncs $(VBOX_WINDDK_WLH) $(VBOX_WINPSDK)INCS
+ VBoxNetLwf_SOURCES.win = \
+ 	win/drv/VBoxNetLwf-win.cpp
+ # with WINDDKWLH the WIN9X_COMPAT_SPINLOCK is needed to avoid inline declaration of KeInitializeSpinLock
+ # otherwise the linker would complain about dumplicate _KeInitializeSpinLock@4 definition
+ # in ntoskrnl.lib and our object files
+ VBoxNetLwf_DEFS.win += WIN9X_COMPAT_SPINLOCK=1 NDISLWF=1 DBG=1
+# VBoxNetLwf_DEFS.win += VBOXNETFLT_STATIC_CONFIG
+# VBoxNetLwf_DEFS.win += VBOXNETFLT_NO_PACKET_QUEUE
+# VBoxNetLwf_DEFS.win += NDIS_MINIPORT_DRIVER NDIS_WDM=1 BINARY_COMPATIBLE=0
+ VBoxNetLwf_DEFS.win += NDIS60=1
+# ifdef VBOX_LOOPBACK_USEFLAGS
+#  VBoxNetLwf_DEFS.win += VBOX_LOOPBACK_USEFLAGS
+# endif
+# VBoxNetLwf_SOURCES = VBoxNetLwf.c
+ VBoxNetLwf_LDFLAGS.win.x86 = -Entry:DriverEntry@8
+ VBoxNetLwf_LDFLAGS.win.amd64 = -Entry:DriverEntry
+ VBoxNetLwf_LIBS.win = \
+ 	$(PATH_SDK_$(VBOX_WINDDK_WLH)_LIB)/ntoskrnl.lib \
+ 	$(PATH_SDK_$(VBOX_WINDDK_WLH)_LIB)/hal.lib \
+ 	$(PATH_SDK_$(VBOX_WINDDK_WLH)_LIB)/ndis.lib \
+ 	$(PATH_SDK_$(VBOX_WINDDK_WLH)_LIB)/netio.lib \
+ 	$(PATH_STAGE_LIB)/RuntimeR0Drv$(VBOX_SUFF_LIB)
+ VBoxNetLwf_LIBS = \
+ 	$(PATH_STAGE_LIB)/SUPR0IdcClient$(VBOX_SUFF_LIB)
+ #
+ # VBoxNetLwf installation.
+ #
+ INSTALLS.win += VBoxNetLwf-inf
+ VBoxNetLwf-inf_TEMPLATE = VBoxR0DrvInfCat
+ VBoxNetLwf-inf_SOURCES = \
+ 	$(PATH_TARGET)/VBoxNetLwfCat.dir/VBoxNetLwf.inf
+ VBoxNetLwf-inf_CLEAN = $(VBoxNetLwf-inf_SOURCES)
+ VBoxNetLwf-inf_BLDDIRS = $(PATH_TARGET)/VBoxNetLwfCat.dir
+
+$(PATH_TARGET)/VBoxNetLwfCat.dir/VBoxNetLwf.inf: $(PATH_SUB_CURRENT)/win/drv/VBoxNetLwf.inf $(MAKEFILE_CURRENT) | $$(dir $$@)
+	$(call MSG_GENERATE,VBoxNetLwf-inf,$@,$<)
+	$(call VBOX_EDIT_INF_FN,$<,$@)
+
+ ifdef VBOX_SIGNING_MODE
+VBoxNetLwf-inf_SOURCES += \
+	$(PATH_TARGET)/VBoxNetLwfCat.dir/VBoxNetLwf.sys \
+	$(PATH_TARGET)/VBoxNetLwfCat.dir/VBoxNetLwf.cat \
+	$(PATH_TARGET)/VBoxNetLwfCat.dir/VBoxNetLwf.cat=>VBoxNetLwf-PreW10.cat
+
+#	$(PATH_TARGET)/VBoxNetLwfCat.dir/VBoxNetLwfNobj.dll \
+
+$(PATH_TARGET)/VBoxNetLwfCat.dir/VBoxNetLwf.sys: $$(VBoxNetLwf_1_TARGET) | $$(dir $$@)
+	$(INSTALL) -m 644 $< $(@D)
+
+#$(PATH_TARGET)/VBoxNetLwfCat.dir/VBoxNetLwfNobj.dll: $$(VBoxNetLwfNobj_1_TARGET) | $$(dir $$@)
+#	$(INSTALL) -m 644 $< $(@D)
+
+$(PATH_TARGET)/VBoxNetLwfCat.dir/VBoxNetLwf.cat: \
+		$(PATH_TARGET)/VBoxNetLwfCat.dir/VBoxNetLwf.sys \
+		$(PATH_TARGET)/VBoxNetLwfCat.dir/VBoxNetLwf.inf
+	$(call MSG_TOOL,Inf2Cat,VBoxNetLwf-inf,$@,$<)
+	$(call VBOX_MAKE_CAT_FN, $(@D),$@)
+
+ endif # signing
+
+
+
+ #
+ # WinNetConfig - static library with host network interface config API
+ #
+ LIBRARIES.win += WinNetConfig
+ WinNetConfig_TEMPLATE = VBOXR3STATIC
+ WinNetConfig_DEFS     = _WIN32_WINNT=0x0501 _UNICODE UNICODE
+ WinNetConfig_SDKS     = ReorderCompilerIncs $(VBOX_WINPSDK) $(VBOX_WINDDK)
+ WinNetConfig_SOURCES  = \
+ 	win/cfg/VBoxNetCfg.cpp
+ WinNetConfig_INCS.win += $(PATH_TOOL_$(VBOX_VCC_TOOL)_INC)
+
+ #
+ # NetFltInstall
+ #
+ PROGRAMS.win  += NetFltInstall
+ NetFltInstall_TEMPLATE = VBOXR3STATIC
+ NetFltInstall_SDKS     = ReorderCompilerIncs $(VBOX_WINPSDK) $(VBOX_WINDDK) VBOX_NTDLL
+ NetFltInstall_SOURCES  = win/tools/VBoxNetFltInstall.cpp
+ NetFltInstall_LIBS     = \
+ 	$(WinNetConfig_1_TARGET) \
+	$(PATH_STAGE_LIB)/VBoxDrvCfg$(VBOX_SUFF_LIB) \
+ 	$(PATH_SDK_$(VBOX_WINDDK)_LIB)/Newdev.lib \
+  	$(PATH_TOOL_$(VBOX_VCC_TOOL)_LIB)/comsupp.lib \
+ 	$(PATH_SDK_$(VBOX_WINPSDK)_LIB)/WbemUuid.Lib
+
+
+ #
+ # NetFltUninstall
+ #
+ PROGRAMS.win  += NetFltUninstall
+ NetFltUninstall_TEMPLATE = VBOXR3STATIC
+ NetFltUninstall_SDKS     = ReorderCompilerIncs $(VBOX_WINPSDK) $(VBOX_WINDDK) VBOX_NTDLL
+ NetFltUninstall_SOURCES  = win/tools/VBoxNetFltUninstall.cpp
+ NetFltUninstall_LIBS     = \
+ 	$(WinNetConfig_1_TARGET) \
+	$(PATH_STAGE_LIB)/VBoxDrvCfg$(VBOX_SUFF_LIB) \
+ 	$(PATH_SDK_$(VBOX_WINDDK)_LIB)/Newdev.lib \
+  	$(PATH_TOOL_$(VBOX_VCC_TOOL)_LIB)/comsupp.lib \
+ 	$(PATH_SDK_$(VBOX_WINPSDK)_LIB)/WbemUuid.Lib
+
+ #
+ # NetAdpInstall
+ #
+ PROGRAMS.win  += NetAdpInstall
+ NetAdpInstall_TEMPLATE = VBOXR3STATIC
+ NetAdpInstall_SDKS     = ReorderCompilerIncs $(VBOX_WINPSDK) $(VBOX_WINDDK) VBOX_NTDLL
+ NetAdpInstall_SOURCES  = win/tools/VBoxNetAdpInstall.cpp
+ NetAdpInstall_LIBS     = \
+ 	$(WinNetConfig_1_TARGET) \
+	$(PATH_STAGE_LIB)/VBoxDrvCfg$(VBOX_SUFF_LIB) \
+ 	$(PATH_SDK_$(VBOX_WINDDK)_LIB)/Newdev.lib \
+  	$(PATH_TOOL_$(VBOX_VCC_TOOL)_LIB)/comsupp.lib \
+ 	$(PATH_SDK_$(VBOX_WINPSDK)_LIB)/WbemUuid.Lib
+
+
+ #
+ # NetAdpUninstall
+ #
+ PROGRAMS.win  += NetAdpUninstall
+ NetAdpUninstall_TEMPLATE = VBOXR3STATIC
+ NetAdpUninstall_SDKS     = ReorderCompilerIncs $(VBOX_WINPSDK) $(VBOX_WINDDK) VBOX_NTDLL
+ NetAdpUninstall_SOURCES  = win/tools/VBoxNetAdpUninstall.cpp
+ NetAdpUninstall_LIBS     = \
+ 	$(WinNetConfig_1_TARGET) \
+	$(PATH_STAGE_LIB)/VBoxDrvCfg$(VBOX_SUFF_LIB) \
+ 	$(PATH_SDK_$(VBOX_WINDDK)_LIB)/Newdev.lib \
+  	$(PATH_TOOL_$(VBOX_VCC_TOOL)_LIB)/comsupp.lib \
+ 	$(PATH_SDK_$(VBOX_WINPSDK)_LIB)/WbemUuid.Lib
+
+ #
+ # NetAdp6Install
+ #
+ PROGRAMS.win  += NetAdp6Install
+ NetAdp6Install_TEMPLATE = VBOXR3STATIC
+ NetAdp6Install_SDKS     = ReorderCompilerIncs $(VBOX_WINPSDK) $(VBOX_WINDDK) VBOX_NTDLL
+ NetAdp6Install_SOURCES  = win/tools/VBoxNetAdpInstall.cpp
+ NetAdp6Install_DEFS    += NDIS60=1
+ NetAdp6Install_LIBS     = \
+ 	$(WinNetConfig_1_TARGET) \
+	$(PATH_STAGE_LIB)/VBoxDrvCfg$(VBOX_SUFF_LIB) \
+ 	$(PATH_SDK_$(VBOX_WINDDK)_LIB)/Newdev.lib \
+  	$(PATH_TOOL_$(VBOX_VCC_TOOL)_LIB)/comsupp.lib \
+ 	$(PATH_SDK_$(VBOX_WINPSDK)_LIB)/WbemUuid.Lib
+
+
+ #
+ # NetAdp6Uninstall
+ #
+ PROGRAMS.win  += NetAdp6Uninstall
+ NetAdp6Uninstall_TEMPLATE = VBOXR3STATIC
+ NetAdp6Uninstall_SDKS     = ReorderCompilerIncs $(VBOX_WINPSDK) $(VBOX_WINDDK) VBOX_NTDLL
+ NetAdp6Uninstall_SOURCES  = win/tools/VBoxNetAdpUninstall.cpp
+ NetAdp6Uninstall_DEFS    += NDIS60=1
+ NetAdp6Uninstall_LIBS     = \
+ 	$(WinNetConfig_1_TARGET) \
+	$(PATH_STAGE_LIB)/VBoxDrvCfg$(VBOX_SUFF_LIB) \
+ 	$(PATH_SDK_$(VBOX_WINDDK)_LIB)/Newdev.lib \
+  	$(PATH_TOOL_$(VBOX_VCC_TOOL)_LIB)/comsupp.lib \
+ 	$(PATH_SDK_$(VBOX_WINPSDK)_LIB)/WbemUuid.Lib
+
+ #
+ # NetLwfInstall
+ #
+ PROGRAMS.win  += NetLwfInstall
+ NetLwfInstall_TEMPLATE = VBOXR3STATIC
+ NetLwfInstall_SDKS     = ReorderCompilerIncs $(VBOX_WINPSDK) $(VBOX_WINDDK) VBOX_NTDLL
+ NetLwfInstall_SOURCES  = win/tools/VBoxNetLwfInstall.cpp
+ NetLwfInstall_LIBS     = \
+ 	$(WinNetConfig_1_TARGET) \
+	$(PATH_STAGE_LIB)/VBoxDrvCfg$(VBOX_SUFF_LIB) \
+ 	$(PATH_SDK_$(VBOX_WINDDK)_LIB)/Newdev.lib \
+  	$(PATH_TOOL_$(VBOX_VCC_TOOL)_LIB)/comsupp.lib \
+ 	$(PATH_SDK_$(VBOX_WINPSDK)_LIB)/WbemUuid.Lib
+
+
+ #
+ # NetLwfUninstall
+ #
+ PROGRAMS.win  += NetLwfUninstall
+ NetLwfUninstall_TEMPLATE = VBOXR3STATIC
+ NetLwfUninstall_SDKS     = ReorderCompilerIncs $(VBOX_WINPSDK) $(VBOX_WINDDK) VBOX_NTDLL
+ NetLwfUninstall_SOURCES  = win/tools/VBoxNetLwfUninstall.cpp
+ NetLwfUninstall_LIBS     = \
+ 	$(WinNetConfig_1_TARGET) \
+	$(PATH_STAGE_LIB)/VBoxDrvCfg$(VBOX_SUFF_LIB) \
+ 	$(PATH_SDK_$(VBOX_WINDDK)_LIB)/Newdev.lib \
+  	$(PATH_TOOL_$(VBOX_VCC_TOOL)_LIB)/comsupp.lib \
+ 	$(PATH_SDK_$(VBOX_WINPSDK)_LIB)/WbemUuid.Lib
+
+ #
+ # VBoxNetFltNobj
+ #
+ DLLS.win += VBoxNetFltNobj
+ VBoxNetFltNobj_TEMPLATE   = VBOXR3STATIC
+ if defined(VBOX_SIGNING_MODE)
+  VBoxNetFltNobj_INSTTYPE  = none
+  VBoxNetFltNobj_DEBUG_INSTTYPE = both
+ endif
+ VBoxNetFltNobj_SDKS       = ReorderCompilerIncs $(VBOX_WINPSDK) $(VBOX_WINDDK) VBOX_NTDLL
+ VBoxNetFltNobj_DEFS       = _WIN32_WINNT=0x0500 WIN32 _ATL_STATIC_REGISTRY
+ VBoxNetFltNobj_INCS       = \
+ 	$(VBoxNetFltNobj_0_OUTDIR)
+ VBoxNetFltNobj_SOURCES    = \
+ 	win/nobj/VBoxNetFltNobj.cpp \
+ 	win/nobj/VBoxNetFltNobj.def \
+ 	win/nobj/VBoxNetFltNobj.rc
+ VBoxNetFltNobj_LIBS       = \
+ 	$(VBOX_LIB_RUNTIME_STATIC)
+ #VBoxNetFltNobj_INTERMEDIATES =
+ VBoxNetFltNobj_DEPS       = \
+ 	$(VBoxNetFltNobj_0_OUTDIR)/VBoxNetFltNobjT_i.c \
+ 	$(VBoxNetFltNobj_0_OUTDIR)/VBoxNetFltNobjT_p.c \
+ 	$(VBoxNetFltNobj_0_OUTDIR)/VBoxNetFltNobjT.h \
+ 	$(VBoxNetFltNobj_0_OUTDIR)/dlldata.c \
+ 	$(VBoxNetFltNobj_0_OUTDIR)/VBoxNetFltNobjT.tlb
+ VBoxNetFltNobj_CLEAN      = $(VBoxNetFltNobj_DEPS)
+
+$$(VBoxNetFltNobj_0_OUTDIR)/VBoxNetFltNobjT_i.c \
++ $$(VBoxNetFltNobj_0_OUTDIR)/VBoxNetFltNobjT_p.c \
++ $$(VBoxNetFltNobj_0_OUTDIR)/VBoxNetFltNobjT.h \
++ $$(VBoxNetFltNobj_0_OUTDIR)/dlldata.c \
++ $$(VBoxNetFltNobj_0_OUTDIR)/VBoxNetFltNobjT.tlb: \
+		$(PATH_SUB_CURRENT)/win/nobj/VBoxNetFltNobjT.idl \
+		| $$(dir $$@)
+	$(VBOX_WIN_MIDL) /nologo \
+		/out $(call VBOX_FN_MAKE_WIN_PATH,$(VBoxNetFltNobj_0_OUTDIR)) \
+		/cpp_cmd $(subst $(EXEC_X86_WIN32),,$(call VBOX_FN_MAKE_WIN_PATH,$(TOOL_$(VBOX_VCC_TOOL)_CC))) \
+		$(addprefix /I , $(call VBOX_FN_MAKE_WIN_PATH,$(SDK_$(VBOX_WINDDK)_INCS))) \
+		$(call VBOX_FN_MAKE_WIN_PATH,$<)
+
+ #
+ # VBoxNetAdp.sys - The VirtualBox Adapter miniport driver.
+ #
+ SYSMODS.win += VBoxNetAdp
+ VBoxNetAdp_TEMPLATE = VBOXR0DRV
+ #VBoxNetAdp_INST = $(INST_VBOXNETADP)
+ if defined(VBOX_SIGNING_MODE)
+  VBoxNetAdp_INSTTYPE.win = none
+  VBoxNetAdp_DEBUG_INSTTYPE.win = both
+ endif
+ VBoxNetAdp_DEFS = IN_RT_R0 IN_SUP_STATIC
+ VBoxNetAdp_INCS := $(PATH_SUB_CURRENT)
+ VBoxNetAdp_SDKS = ReorderCompilerIncs $(VBOX_WINDDK_WLH) $(VBOX_WINPSDK)INCS
+ VBoxNetAdp_SOURCES = \
+ 	VBoxNetFlt.c \
+ 	win/drv/VBoxNetFltM-win.cpp \
+ 	win/drv/VBoxNetFltRt-win.cpp \
+ 	win/drv/VBoxNetFlt-win.rc
+ VBoxNetAdp_DEFS += VBOXNETFLT_STATIC_CONFIG VBOXNETADP
+ VBoxNetAdp_DEFS.win += VBOXNETFLT_NO_PACKET_QUEUE
+ VBoxNetAdp_DEFS += NDIS_MINIPORT_DRIVER NDIS_WDM=1 BINARY_COMPATIBLE=0
+ VBoxNetAdp_DEFS += NDIS50_MINIPORT=1 NDIS50=1
+ VBoxNetAdp_LDFLAGS.win.x86 = -Entry:DriverEntry@8
+ VBoxNetAdp_LDFLAGS.win.amd64 = -Entry:DriverEntry
+ VBoxNetAdp_LIBS.win = \
+ 	$(PATH_SDK_$(VBOX_WINDDK)_LIB)/ntoskrnl.lib \
+ 	$(PATH_SDK_$(VBOX_WINDDK)_LIB)/hal.lib \
+ 	$(PATH_SDK_$(VBOX_WINDDK)_LIB)/ndis.lib \
+ 	$(PATH_STAGE_LIB)/RuntimeR0Drv$(VBOX_SUFF_LIB)
+ VBoxNetAdp_LIBS = \
+ 	$(PATH_STAGE_LIB)/SUPR0IdcClient$(VBOX_SUFF_LIB)
+
+
+ INSTALLS.win += VBoxNetAdp-inf
+ VBoxNetAdp-inf_TEMPLATE = VBoxR0DrvInfCat
+ VBoxNetAdp-inf_SOURCES = \
+ 	$(PATH_TARGET)/VBoxNetAdpCat.dir/VBoxNetAdp.inf
+ VBoxNetAdp-inf_CLEAN = $(VBoxNetAdp-inf_SOURCES)
+ VBoxNetAdp-inf_BLDDIRS = $(PATH_TARGET)/VBoxNetAdpCat.dir
+
+$(PATH_TARGET)/VBoxNetAdpCat.dir/VBoxNetAdp.inf: $(PATH_SUB_CURRENT)/win/drv/VBoxNetAdp.inf $(MAKEFILE_CURRENT) | $$(dir $$@)
+	$(call MSG_GENERATE,VBoxNetAdp-inf,$@,$<)
+	$(call VBOX_EDIT_INF_FN,$<,$@)
+
+ ifdef VBOX_SIGNING_MODE
+VBoxNetAdp-inf_SOURCES += \
+	$(PATH_TARGET)/VBoxNetAdpCat.dir/VBoxNetAdp.sys \
+	$(PATH_TARGET)/VBoxNetAdpCat.dir/VBoxNetAdp.cat
+
+$(PATH_TARGET)/VBoxNetAdpCat.dir/VBoxNetAdp.sys: $$(VBoxNetAdp_1_TARGET) | $$(dir $$@)
+	$(INSTALL) -m 644 $< $(@D)
+
+$(PATH_TARGET)/VBoxNetAdpCat.dir/VBoxNetAdp.cat: \
+		$(PATH_TARGET)/VBoxNetAdpCat.dir/VBoxNetAdp.sys \
+		$(PATH_TARGET)/VBoxNetAdpCat.dir/VBoxNetAdp.inf
+	$(call MSG_TOOL,Inf2Cat,VBoxNetFlt-inf,$@,$<)
+	$(call VBOX_MAKE_CAT_FN, $(@D),$@)
+
+ endif #  ifdef VBOX_SIGNING_MODE
+
+endif #ifeq ($(KBUILD_TARGET), win)
+
+else if1of ($(KBUILD_TARGET), solaris freebsd) ## @todo merge this with the mixed case stuff.
+#
+# vboxnetflt(.ko/.o/) - The lower case driver.
+# Note! On Solaris the name has to be <= 8 chars long.
+# The DEBUG_HASH* stuff is for CONFIG_DYNAMIC_DEBUG-enabled kernels
+#
+ ifdef VBOX_WITH_VBOXDRV
+  SYSMODS += vboxnetflt
+  vboxnetflt_TEMPLATE      = VBOXR0DRV
+  vboxnetflt_NAME.solaris  = vboxflt
+  vboxnetflt_DEFS          = IN_RT_R0
+  vboxnetflt_DEPS.solaris += $(VBOX_SVN_REV_KMK)
+  vboxnetflt_INCS         := \
+  	$(PATH_SUB_CURRENT)
+  vboxnetflt_LDFLAGS.solaris += -N drv/vboxdrv -N misc/ctf
+  vboxnetflt_LIBS = \
+  	$(PATH_STAGE_LIB)/SUPR0IdcClient$(VBOX_SUFF_LIB)
+  ## @todo vboxflt should resolves all the IPRT bits from vboxdrv.
+  #vboxnetflt_LIBS += \
+  #	$(PATH_STAGE_LIB)/RuntimeR0Drv$(VBOX_SUFF_LIB)
+  vboxnetflt_SOURCES.solaris = solaris/VBoxNetFlt-solaris.c
+  vboxnetflt_SOURCES.freebsd = freebsd/VBoxNetFlt-freebsd.c
+  vboxnetflt_SOURCES = VBoxNetFlt.c
+  solaris/VBoxNetFlt-solaris.c_DEFS = VBOX_SVN_REV=$(VBOX_SVN_REV)
+
+  ifdef VBOX_WITH_NETFLT_CROSSBOW
+   SYSMODS += vboxnetbow
+   vboxnetbow_TEMPLATE      = VBOXR0DRV
+   vboxnetbow_NAME          = vboxbow
+   vboxnetbow_DEFS          = vboxnetflt_DEFS VBOX_WITH_NETFLT_CROSSBOW
+   vboxnetbow_INCS         := $(PATH_SUB_CURRENT)
+   vboxnetbow_LDFLAGS      += -N drv/vboxdrv -N drv/vnic -N misc/mac -N misc/dls
+   vboxnetbow_LIBS = \
+   	$(PATH_STAGE_LIB)/SUPR0IdcClient$(VBOX_SUFF_LIB)
+   vboxnetbow_SOURCES.solaris = solaris/VBoxNetFltBow-solaris.c
+   vboxnetbow_SOURCES         = VBoxNetFlt.c
+   solaris/VBoxNetFltBow-solaris.c_DEFS = VBOX_SVN_REV=$(VBOX_SVN_REV)
+  endif  # VBOX_WITH_NETFLT_CROSSBOW
+ endif # VBOX_WITH_VBOXDRV
+endif # to be removed.
+
+
+ifeq ($(KBUILD_TARGET),linux)
+ #
+ # Install source files for compilation on Linux.
+ # files_vboxnetflt defines VBOX_VBOXNETFLT_SOURCES.
+ #
+ include $(PATH_SUB_CURRENT)/linux/files_vboxnetflt
+ INSTALLS += VBoxNetFlt-src VBoxNetFlt-sh
+ VBoxNetFlt-src_INST    = bin/src/vboxnetflt/
+ VBoxNetFlt-src_SOURCES = \
+	$(subst $(DQUOTE),,$(VBOX_VBOXNETFLT_SOURCES)) \
+	$(VBoxNetFlt-src_0_OUTDIR)/Makefile
+ VBoxNetFlt-src_CLEAN   = \
+	$(VBoxNetFlt-src_0_OUTDIR)/Makefile \
+	$(PATH_TARGET)/VBoxNetFlt-src-1.dep \
+
+ # Scripts needed for building the kernel module.
+
+ includedep $(PATH_TARGET)/VBoxNetFlt-src-1.dep
+ $$(VBoxNetFlt-src_0_OUTDIR)/Makefile: \
+		$(PATH_SUB_CURRENT)/linux/Makefile \
+		$$(if $$(eq $$(VBoxNetFlt/linux/Makefile_VBOX_HARDENED),$$(VBOX_WITH_HARDENING)),,FORCE) \
+		| $$(dir $$@)
+	$(QUIET)$(RM) -f -- $@
+ ifndef VBOX_WITH_HARDENING
+	$(QUIET)$(SED) -e "s;VBOX_WITH_HARDENING;;g" --output $@ $<
+ else
+	$(QUIET)$(CP) -f $< $@
+ endif
+	%$(QUIET2)$(RM) -f -- $(PATH_TARGET)/VBoxNetFlt-src-1.dep
+	%$(QUIET2)$(APPEND) '$(PATH_TARGET)/VBoxNetFlt-src-1.dep' 'VBoxNetFlt/linux/Makefile_VBOX_HARDENED=$(VBOX_WITH_HARDENING)'
+
+ #
+ # Build test for the linux host kernel modules.
+ #
+ $(evalcall2 VBOX_LINUX_KMOD_TEST_BUILD_RULE_FN,VBoxNetFlt-src,vboxdrv-src,)
+endif # linux
+
+# Gross hack for FreeBSD 7, should figure this out properly
+## @todo Properly generate opt_netgraph.h
+ifeq ($(KBUILD_TARGET),freebsd)
+ vboxnetflt_DEPS.freebsd += $(PATH_OUT)/opt_netgraph.h
+$(PATH_OUT)/opt_netgraph.h:
+	echo > $(PATH_OUT)/opt_netgraph.h
+
+ #
+ # Install source files for compilation on FreeBSD.
+ # files_vboxnetflt defines VBOX_VBOXNETFLT_SOURCES.
+ #
+ include $(PATH_SUB_CURRENT)/freebsd/files_vboxnetflt
+ INSTALLS += VBoxNetFlt-src
+ VBoxNetFlt-src_INST    = bin/src/vboxnetflt/
+ VBoxNetFlt-src_SOURCES = \
+	$(subst $(DQUOTE),,$(VBOX_VBOXNETFLT_SOURCES)) \
+ 	$(VBoxNetFlt-src_0_OUTDIR)/Makefile
+ VBoxNetFlt-src_CLEAN   = \
+ 	$(VBoxNetFlt-src_0_OUTDIR)/Makefile	\
+
+ $$(VBoxNetFlt-src_0_OUTDIR)/Makefile: \
+		$(PATH_SUB_CURRENT)/freebsd/Makefile \
+		$$(if $$(eq $$(VBoxNetFlt/freebsd/Makefile_VBOX_HARDENED),$$(VBOX_WITH_HARDENING)),,FORCE) \
+		| $$(dir $$@)
+	$(QUIET)$(RM) -f -- $@
+	$(QUIET)$(CP) -f $< $@
+ ifndef VBOX_WITH_HARDENING
+	$(QUIET)$(SED) -e "s;VBOX_WITH_HARDENING;;g" --output $@.tmp $@
+	${QUIET}$(MV) -f $@.tmp $@
+ endif
+ ifndef VBOX_WITH_NETFLT_VIMAGE
+	$(QUIET)$(SED) -e "s;-DVIMAGE;;g" --output $@.tmp $@
+	${QUIET}$(MV) -f $@.tmp $@
+ endif
+endif # freebsd
+
+include $(FILE_KBUILD_SUB_FOOTER)
+
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/VBoxNetFlt.c b/src/VBox/HostDrivers/VBoxNetFlt/VBoxNetFlt.c
new file mode 100644
index 00000000..616f7785
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/VBoxNetFlt.c
@@ -0,0 +1,1581 @@
+/* $Id: VBoxNetFlt.c $ */
+/** @file
+ * VBoxNetFlt - Network Filter Driver (Host), Common Code.
+ */
+
+/*
+ * Copyright (C) 2008-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+/** @page pg_netflt     VBoxNetFlt - Network Interface Filter
+ *
+ * This is a kernel module that attaches to a real interface on the host and
+ * filters and injects packets.
+ *
+ * In the big picture we're one of the three trunk interface on the internal
+ * network, the one named "NIC Filter Driver": @image html Networking_Overview.gif
+ *
+ *
+ * @section  sec_netflt_locking     Locking and Potential Races
+ *
+ * The main challenge here is to make sure the netfilter and internal network
+ * instances won't be destroyed while someone is calling into them.
+ *
+ * The main calls into or out of of the filter driver are:
+ *      - Send.
+ *      - Async send completion (not implemented yet)
+ *      - Release by the internal network.
+ *      - Receive.
+ *      - Disappearance of the host networking interface.
+ *      - Reappearance of the host networking interface.
+ *
+ * The latter two calls are can be caused by driver unloading/loading or the
+ * device being physical unplugged (e.g. a USB network device).  Actually, the
+ * unload scenario must fervently be prevent as it will cause panics because the
+ * internal network will assume the trunk is around until it releases it.
+ * @todo Need to figure which host allow unloading and block/fix it.
+ *
+ * Currently the netfilter instance lives until the internal network releases
+ * it. So, it is the internal networks responsibility to make sure there are no
+ * active calls when it releases the trunk and destroys the network.  The
+ * netfilter assists in this by providing INTNETTRUNKIFPORT::pfnSetState and
+ * INTNETTRUNKIFPORT::pfnWaitForIdle.  The trunk state is used to enable/disable
+ * promiscuous mode on the hardware NIC (or similar activation) as well
+ * indicating that disconnect is imminent and no further calls shall be made
+ * into the internal network.  After changing the state to disconnecting and
+ * prior to invoking INTNETTRUNKIFPORT::pfnDisconnectAndRelease, the internal
+ * network will use INTNETTRUNKIFPORT::pfnWaitForIdle to wait for any still
+ * active calls to complete.
+ *
+ * The netfilter employs a busy counter and an internal state in addition to the
+ * public trunk state.  All these variables are protected using a spinlock.
+ *
+ *
+ * @section  sec_netflt_msc     Locking / Sequence Diagrams - OBSOLETE
+ *
+ * !OBSOLETE! - THIS WAS THE OLD APPROACH!
+ *
+ * This secion contains a few sequence diagrams describing the problematic
+ * transitions of a host interface filter instance.
+ *
+ * The thing that makes it all a bit problematic is that multiple events may
+ * happen at the same time, and that we have to be very careful to avoid
+ * deadlocks caused by mixing our locks with the ones in the host kernel. The
+ * main events are receive, send, async send completion, disappearance of the
+ * host networking interface and its reappearance.  The latter two events are
+ * can be caused by driver unloading/loading or the device being physical
+ * unplugged (e.g. a USB network device).
+ *
+ * The strategy for dealing with these issues are:
+ *    - Use a simple state machine.
+ *    - Require the user (IntNet) to serialize all its calls to us,
+ *      while at the same time not owning any lock used by any of the
+ *      the callbacks we might call on receive and async send completion.
+ *    - Make sure we're 100% idle before disconnecting, and have a
+ *      disconnected status on both sides to fend off async calls.
+ *    - Protect the host specific interface handle and the state variables
+ *      using a spinlock.
+ *
+ *
+ * @subsection subsec_netflt_msc_dis_rel    Disconnect from the network and release - OBSOLETE
+ *
+ * @msc
+ *      VM, IntNet, NetFlt, Kernel, Wire;
+ *
+ *      VM->IntNet      [label="pkt0", linecolor="green", textcolor="green"];
+ *      IntNet=>IntNet  [label="Lock Network", linecolor="green", textcolor="green" ];
+ *      IntNet=>IntNet  [label="Route packet -> wire", linecolor="green", textcolor="green" ];
+ *      IntNet=>IntNet  [label="Unlock Network", linecolor="green", textcolor="green" ];
+ *      IntNet=>NetFlt  [label="pkt0 to wire", linecolor="green", textcolor="green" ];
+ *      NetFlt=>Kernel  [label="pkt0 to wire", linecolor="green", textcolor="green"];
+ *      Kernel->Wire    [label="pkt0 to wire", linecolor="green", textcolor="green"];
+ *
+ *      ---             [label="Suspending the trunk interface"];
+ *      IntNet=>IntNet  [label="Lock Network"];
+ *
+ *      Wire->Kernel    [label="pkt1 - racing us", linecolor="red", textcolor="red"];
+ *      Kernel=>>NetFlt [label="pkt1 - racing us", linecolor="red", textcolor="red"];
+ *      NetFlt=>>IntNet [label="pkt1 recv - blocks", linecolor="red", textcolor="red"];
+ *
+ *      IntNet=>IntNet  [label="Mark Trunk Suspended"];
+ *      IntNet=>IntNet  [label="Unlock Network"];
+ *
+ *      IntNet=>NetFlt  [label="pfnSetActive(false)"];
+ *      NetFlt=>NetFlt  [label="Mark inactive (atomic)"];
+ *      IntNet<<NetFlt;
+ *      IntNet=>NetFlt  [label="pfnWaitForIdle(forever)"];
+ *
+ *      IntNet=>>NetFlt [label="pkt1 to host", linecolor="red", textcolor="red"];
+ *      NetFlt=>>Kernel [label="pkt1 to host", linecolor="red", textcolor="red"];
+ *
+ *      Kernel<-Wire    [label="pkt0 on wire", linecolor="green", textcolor="green"];
+ *      NetFlt<<Kernel  [label="pkt0 on wire", linecolor="green", textcolor="green"];
+ *      IntNet<<=NetFlt [label="pfnSGRelease", linecolor="green", textcolor="green"];
+ *      IntNet<<=IntNet [label="Lock Net, free SG, Unlock Net", linecolor="green", textcolor="green"];
+ *      IntNet>>NetFlt  [label="pfnSGRelease", linecolor="green", textcolor="green"];
+ *      NetFlt<-NetFlt  [label="idle", linecolor="green", textcolor="green"];
+ *
+ *      IntNet<<NetFlt  [label="idle (pfnWaitForIdle)"];
+ *
+ *      Wire->Kernel    [label="pkt2", linecolor="red", textcolor="red"];
+ *      Kernel=>>NetFlt [label="pkt2", linecolor="red", textcolor="red"];
+ *      NetFlt=>>Kernel [label="pkt2 to host", linecolor="red", textcolor="red"];
+ *
+ *      VM->IntNet      [label="pkt3", linecolor="green", textcolor="green"];
+ *      IntNet=>IntNet  [label="Lock Network", linecolor="green", textcolor="green" ];
+ *      IntNet=>IntNet  [label="Route packet -> drop", linecolor="green", textcolor="green" ];
+ *      IntNet=>IntNet  [label="Unlock Network", linecolor="green", textcolor="green" ];
+ *
+ *      ---             [label="The trunk interface is idle now, disconnect it"];
+ *      IntNet=>IntNet  [label="Lock Network"];
+ *      IntNet=>IntNet  [label="Unlink Trunk"];
+ *      IntNet=>IntNet  [label="Unlock Network"];
+ *      IntNet=>NetFlt  [label="pfnDisconnectAndRelease"];
+ *      NetFlt=>Kernel  [label="iflt_detach"];
+ *      NetFlt<<=Kernel [label="iff_detached"];
+ *      NetFlt>>Kernel  [label="iff_detached"];
+ *      NetFlt<<Kernel  [label="iflt_detach"];
+ *      NetFlt=>NetFlt  [label="Release"];
+ *      IntNet<<NetFlt  [label="pfnDisconnectAndRelease"];
+ *
+ * @endmsc
+ *
+ *
+ *
+ * @subsection subsec_netflt_msc_hif_rm    Host Interface Removal - OBSOLETE
+ *
+ * The ifnet_t (pIf) is a tricky customer as any reference to it can potentially
+ * race the filter detaching. The simple way of solving it on Darwin is to guard
+ * all access to the pIf member with a spinlock. The other host systems will
+ * probably have similar race conditions, so the spinlock is a generic thing.
+ *
+ * @msc
+ *      VM, IntNet, NetFlt, Kernel;
+ *
+ *      VM->IntNet      [label="pkt0", linecolor="green", textcolor="green"];
+ *      IntNet=>IntNet  [label="Lock Network", linecolor="green", textcolor="green" ];
+ *      IntNet=>IntNet  [label="Route packet -> wire", linecolor="green", textcolor="green" ];
+ *      IntNet=>IntNet  [label="Unlock Network", linecolor="green", textcolor="green" ];
+ *      IntNet=>NetFlt  [label="pkt0 to wire", linecolor="green", textcolor="green" ];
+ *      NetFlt=>Kernel  [label="ifnet_reference w/ spinlock", linecolor="green", textcolor="green" ];
+ *      NetFlt<<Kernel  [label="ifnet_reference", linecolor="green", textcolor="green" ];
+ *      NetFlt=>Kernel  [label="pkt0 to wire (blocks)", linecolor="green", textcolor="green" ];
+ *
+ *      ---             [label="The host interface is being disconnected"];
+ *      Kernel->NetFlt  [label="iff_detached"];
+ *      NetFlt=>Kernel  [label="ifnet_release w/ spinlock"];
+ *      NetFlt<<Kernel  [label="ifnet_release"];
+ *      NetFlt=>NetFlt  [label="fDisconnectedFromHost=true"];
+ *      NetFlt>>Kernel  [label="iff_detached"];
+ *
+ *      NetFlt<<Kernel  [label="dropped", linecolor="green", textcolor="green"];
+ *      NetFlt=>NetFlt  [label="Acquire spinlock", linecolor="green", textcolor="green"];
+ *      NetFlt=>Kernel  [label="ifnet_release", linecolor="green", textcolor="green"];
+ *      NetFlt<<Kernel  [label="ifnet_release", linecolor="green", textcolor="green"];
+ *      NetFlt=>NetFlt  [label="pIf=NULL", linecolor="green", textcolor="green"];
+ *      NetFlt=>NetFlt  [label="Release spinlock", linecolor="green", textcolor="green"];
+ *      IntNet<=NetFlt  [label="pfnSGRelease", linecolor="green", textcolor="green"];
+ *      IntNet>>NetFlt  [label="pfnSGRelease", linecolor="green", textcolor="green"];
+ *      IntNet<<NetFlt  [label="pkt0 to wire", linecolor="green", textcolor="green"];
+ *
+ * @endmsc
+ *
+ *
+ *
+ * @subsection subsec_netflt_msc_hif_rd    Host Interface Rediscovery - OBSOLETE
+ *
+ * The rediscovery is performed when we receive a send request and a certain
+ * period have elapsed since the last attempt, i.e. we're polling it. We
+ * synchronize the rediscovery with disconnection from the internal network
+ * by means of the pfnWaitForIdle call, so no special handling is required.
+ *
+ * @msc
+ *      VM2, VM1, IntNet, NetFlt, Kernel, Wire;
+ *
+ *      ---             [label="Rediscovery conditions are not met"];
+ *      VM1->IntNet     [label="pkt0"];
+ *      IntNet=>IntNet  [label="Lock Network"];
+ *      IntNet=>IntNet  [label="Route packet -> wire"];
+ *      IntNet=>IntNet  [label="Unlock Network"];
+ *      IntNet=>NetFlt  [label="pkt0 to wire"];
+ *      NetFlt=>NetFlt  [label="Read pIf(==NULL) w/ spinlock"];
+ *      IntNet<<NetFlt  [label="pkt0 to wire (dropped)"];
+ *
+ *      ---             [label="Rediscovery conditions"];
+ *      VM1->IntNet     [label="pkt1"];
+ *      IntNet=>IntNet  [label="Lock Network"];
+ *      IntNet=>IntNet  [label="Route packet -> wire"];
+ *      IntNet=>IntNet  [label="Unlock Network"];
+ *      IntNet=>NetFlt  [label="pkt1 to wire"];
+ *      NetFlt=>NetFlt  [label="Read pIf(==NULL) w/ spinlock"];
+ *      NetFlt=>NetFlt  [label="fRediscoveryPending=true w/ spinlock"];
+ *      NetFlt=>Kernel  [label="ifnet_find_by_name"];
+ *      NetFlt<<Kernel  [label="ifnet_find_by_name (success)"];
+ *
+ *      VM2->IntNet     [label="pkt2", linecolor="red", textcolor="red"];
+ *      IntNet=>IntNet  [label="Lock Network", linecolor="red", textcolor="red"];
+ *      IntNet=>IntNet  [label="Route packet -> wire", linecolor="red", textcolor="red"];
+ *      IntNet=>IntNet  [label="Unlock Network", linecolor="red", textcolor="red"];
+ *      IntNet=>NetFlt  [label="pkt2 to wire", linecolor="red", textcolor="red"];
+ *      NetFlt=>NetFlt  [label="!pIf || fRediscoveryPending (w/ spinlock)", linecolor="red", textcolor="red"];
+ *      IntNet<<NetFlt  [label="pkt2 to wire (dropped)", linecolor="red", textcolor="red"];
+
+ *      NetFlt=>Kernel  [label="iflt_attach"];
+ *      NetFlt<<Kernel  [label="iflt_attach (success)"];
+ *      NetFlt=>NetFlt  [label="Acquire spinlock"];
+ *      NetFlt=>NetFlt  [label="Set pIf and update flags"];
+ *      NetFlt=>NetFlt  [label="Release spinlock"];
+ *
+ *      NetFlt=>Kernel  [label="pkt1 to wire"];
+ *      Kernel->Wire    [label="pkt1 to wire"];
+ *      NetFlt<<Kernel  [label="pkt1 to wire"];
+ *      IntNet<<NetFlt  [label="pkt1 to wire"];
+ *
+ *
+ * @endmsc
+ *
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP LOG_GROUP_NET_FLT_DRV
+#include "VBoxNetFltInternal.h"
+
+#include <VBox/sup.h>
+#include <VBox/log.h>
+#include <VBox/err.h>
+#include <iprt/assert.h>
+#include <iprt/string.h>
+#include <iprt/spinlock.h>
+#include <iprt/uuid.h>
+#include <iprt/mem.h>
+#include <iprt/time.h>
+#include <iprt/semaphore.h>
+#include <iprt/thread.h>
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+#define IFPORT_2_VBOXNETFLTINS(pIfPort) \
+    ( (PVBOXNETFLTINS)((uint8_t *)(pIfPort) - RT_UOFFSETOF(VBOXNETFLTINS, MyPort)) )
+
+
+AssertCompileMemberSize(VBOXNETFLTINS, enmState, sizeof(uint32_t));
+
+/**
+ * Sets the enmState member atomically.
+ *
+ * Used for all updates.
+ *
+ * @param   pThis           The instance.
+ * @param   enmNewState     The new value.
+ */
+DECLINLINE(void) vboxNetFltSetState(PVBOXNETFLTINS pThis, VBOXNETFTLINSSTATE enmNewState)
+{
+    ASMAtomicWriteU32((uint32_t volatile *)&pThis->enmState, enmNewState);
+}
+
+
+/**
+ * Gets the enmState member atomically.
+ *
+ * Used for all reads.
+ *
+ * @returns The enmState value.
+ * @param   pThis           The instance.
+ */
+DECLINLINE(VBOXNETFTLINSSTATE) vboxNetFltGetState(PVBOXNETFLTINS pThis)
+{
+    return (VBOXNETFTLINSSTATE)ASMAtomicUoReadU32((uint32_t volatile *)&pThis->enmState);
+}
+
+
+/**
+ * Finds a instance by its name, the caller does the locking.
+ *
+ * @returns Pointer to the instance by the given name. NULL if not found.
+ * @param   pGlobals        The globals.
+ * @param   pszName         The name of the instance.
+ */
+static PVBOXNETFLTINS vboxNetFltFindInstanceLocked(PVBOXNETFLTGLOBALS pGlobals, const char *pszName)
+{
+    PVBOXNETFLTINS pCur;
+    for (pCur = pGlobals->pInstanceHead; pCur; pCur = pCur->pNext)
+        if (!strcmp(pszName, pCur->szName))
+            return pCur;
+    return NULL;
+}
+
+
+/**
+ * Finds a instance by its name, will request the mutex.
+ *
+ * No reference to the instance is retained, we're assuming the caller to
+ * already have one but just for some reason doesn't have the pointer to it.
+ *
+ * @returns Pointer to the instance by the given name. NULL if not found.
+ * @param   pGlobals        The globals.
+ * @param   pszName         The name of the instance.
+ */
+DECLHIDDEN(PVBOXNETFLTINS) vboxNetFltFindInstance(PVBOXNETFLTGLOBALS pGlobals, const char *pszName)
+{
+    PVBOXNETFLTINS pRet;
+    int rc = RTSemFastMutexRequest(pGlobals->hFastMtx);
+    AssertRCReturn(rc, NULL);
+
+    pRet = vboxNetFltFindInstanceLocked(pGlobals, pszName);
+
+    rc = RTSemFastMutexRelease(pGlobals->hFastMtx);
+    AssertRC(rc);
+    return pRet;
+}
+
+
+/**
+ * Unlinks an instance from the chain.
+ *
+ * @param   pGlobals        The globals.
+ * @param   pToUnlink       The instance to unlink.
+ */
+static void vboxNetFltUnlinkLocked(PVBOXNETFLTGLOBALS pGlobals, PVBOXNETFLTINS pToUnlink)
+{
+    if (pGlobals->pInstanceHead == pToUnlink)
+        pGlobals->pInstanceHead = pToUnlink->pNext;
+    else
+    {
+        PVBOXNETFLTINS pCur;
+        for (pCur = pGlobals->pInstanceHead; pCur; pCur = pCur->pNext)
+            if (pCur->pNext == pToUnlink)
+            {
+                pCur->pNext = pToUnlink->pNext;
+                break;
+            }
+        Assert(pCur);
+    }
+    pToUnlink->pNext = NULL;
+}
+
+
+/**
+ * Performs interface rediscovery if it was disconnected from the host.
+ *
+ * @returns true if successfully rediscovered and connected, false if not.
+ * @param   pThis           The instance.
+ */
+static bool vboxNetFltMaybeRediscovered(PVBOXNETFLTINS pThis)
+{
+    uint64_t        Now;
+    bool            fRediscovered;
+    bool            fDoIt;
+
+    /*
+     * Don't do rediscovery if we're called with preemption disabled.
+     *
+     * Note! This may cause trouble if we're always called with preemption
+     *       disabled and vboxNetFltOsMaybeRediscovered actually does some real
+     *       work.  For the time being though, only Darwin and FreeBSD depends
+     *       on these call outs and neither supports sending with preemption
+     *       disabled.
+     */
+    if (!RTThreadPreemptIsEnabled(NIL_RTTHREAD))
+        return false;
+
+    /*
+     * Rediscovered already? Time to try again?
+     */
+    Now = RTTimeNanoTS();
+    RTSpinlockAcquire(pThis->hSpinlock);
+
+    fRediscovered = !ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost);
+    fDoIt = !fRediscovered
+         && !ASMAtomicUoReadBool(&pThis->fRediscoveryPending)
+         && Now - ASMAtomicUoReadU64(&pThis->NanoTSLastRediscovery) > UINT64_C(5000000000); /* 5 sec */
+    if (fDoIt)
+        ASMAtomicWriteBool(&pThis->fRediscoveryPending, true);
+
+    RTSpinlockRelease(pThis->hSpinlock);
+
+    /*
+     * Call the OS specific code to do the job.
+     * Update the state when the call returns, that is everything except for
+     * the fDisconnectedFromHost flag which the OS specific code shall set.
+     */
+    if (fDoIt)
+    {
+        fRediscovered = vboxNetFltOsMaybeRediscovered(pThis);
+
+        Assert(!fRediscovered || !ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost));
+
+        ASMAtomicUoWriteU64(&pThis->NanoTSLastRediscovery, RTTimeNanoTS());
+        ASMAtomicWriteBool(&pThis->fRediscoveryPending, false);
+
+        if (fRediscovered)
+            /** @todo this isn't 100% serialized. */
+            vboxNetFltPortOsSetActive(pThis, pThis->enmTrunkState == INTNETTRUNKIFSTATE_ACTIVE);
+    }
+
+    return fRediscovered;
+}
+
+
+/**
+ * @copydoc INTNETTRUNKIFPORT::pfnXmit
+ */
+static DECLCALLBACK(int) vboxNetFltPortXmit(PINTNETTRUNKIFPORT pIfPort, void *pvIfData, PINTNETSG pSG, uint32_t fDst)
+{
+    PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
+    int rc = VINF_SUCCESS;
+
+    /*
+     * Input validation.
+     */
+    AssertPtr(pThis);
+    AssertPtr(pSG);
+    Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
+    AssertReturn(vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Connected, VERR_INVALID_STATE);
+
+    /*
+     * Do a busy retain and then make sure we're connected to the interface
+     * before invoking the OS specific code.
+     */
+    if (RT_LIKELY(vboxNetFltTryRetainBusyActive(pThis)))
+    {
+        if (    !ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost)
+            ||  vboxNetFltMaybeRediscovered(pThis))
+            rc = vboxNetFltPortOsXmit(pThis, pvIfData, pSG, fDst);
+        vboxNetFltRelease(pThis, true /* fBusy */);
+    }
+
+    return rc;
+}
+
+
+/**
+ * @copydoc INTNETTRUNKIFPORT::pfnWaitForIdle
+ */
+static DECLCALLBACK(int) vboxNetFltPortWaitForIdle(PINTNETTRUNKIFPORT pIfPort, uint32_t cMillies)
+{
+    PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
+    int rc;
+
+    /*
+     * Input validation.
+     */
+    AssertPtr(pThis);
+    Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
+    AssertReturn(vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Connected, VERR_INVALID_STATE);
+    AssertReturn(pThis->enmTrunkState == INTNETTRUNKIFSTATE_DISCONNECTING, VERR_INVALID_STATE);
+
+    /*
+     * Go to sleep on the semaphore after checking the busy count.
+     */
+    vboxNetFltRetain(pThis, false /* fBusy */);
+
+    rc = VINF_SUCCESS;
+    while (pThis->cBusy && RT_SUCCESS(rc))
+        rc = RTSemEventWait(pThis->hEventIdle, cMillies); /** @todo make interruptible? */
+
+    vboxNetFltRelease(pThis, false /* fBusy */);
+
+    return rc;
+}
+
+
+/**
+ * @copydoc INTNETTRUNKIFPORT::pfnSetState
+ */
+static DECLCALLBACK(INTNETTRUNKIFSTATE) vboxNetFltPortSetState(PINTNETTRUNKIFPORT pIfPort, INTNETTRUNKIFSTATE enmState)
+{
+    PVBOXNETFLTINS      pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
+    INTNETTRUNKIFSTATE  enmOldTrunkState;
+
+    /*
+     * Input validation.
+     */
+    AssertPtr(pThis);
+    AssertPtr(pThis->pGlobals);
+    Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
+    AssertReturn(vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Connected, INTNETTRUNKIFSTATE_INVALID);
+    AssertReturn(enmState > INTNETTRUNKIFSTATE_INVALID && enmState < INTNETTRUNKIFSTATE_END,
+                 INTNETTRUNKIFSTATE_INVALID);
+
+    /*
+     * Take the lock and change the state.
+     */
+    RTSpinlockAcquire(pThis->hSpinlock);
+    enmOldTrunkState = pThis->enmTrunkState;
+    if (enmOldTrunkState != enmState)
+        ASMAtomicWriteU32((uint32_t volatile *)&pThis->enmTrunkState, enmState);
+    RTSpinlockRelease(pThis->hSpinlock);
+
+    /*
+     * If the state change indicates that the trunk has become active or
+     * inactive, call the OS specific part so they can work the promiscuous
+     * settings and such.
+     * Note! The caller makes sure there are no concurrent pfnSetState calls.
+     */
+    if ((enmOldTrunkState == INTNETTRUNKIFSTATE_ACTIVE) != (enmState == INTNETTRUNKIFSTATE_ACTIVE))
+        vboxNetFltPortOsSetActive(pThis, (enmState == INTNETTRUNKIFSTATE_ACTIVE));
+
+    return enmOldTrunkState;
+}
+
+
+/**
+ * @copydoc INTNETTRUNKIFPORT::pfnNotifyMacAddress
+ */
+static DECLCALLBACK(void) vboxNetFltPortNotifyMacAddress(PINTNETTRUNKIFPORT pIfPort, void *pvIfData, PCRTMAC pMac)
+{
+    PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
+
+    /*
+     * Input validation.
+     */
+    AssertPtr(pThis);
+    Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
+
+    vboxNetFltRetain(pThis, false /* fBusy */);
+    vboxNetFltPortOsNotifyMacAddress(pThis, pvIfData, pMac);
+    vboxNetFltRelease(pThis, false /* fBusy */);
+}
+
+
+/**
+ * @copydoc INTNETTRUNKIFPORT::pfnConnectInterface
+ */
+static DECLCALLBACK(int) vboxNetFltPortConnectInterface(PINTNETTRUNKIFPORT pIfPort, void *pvIf, void **ppvIfData)
+{
+    PVBOXNETFLTINS  pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
+    int             rc;
+
+    /*
+     * Input validation.
+     */
+    AssertPtr(pThis);
+    Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
+
+    vboxNetFltRetain(pThis, false /* fBusy */);
+    rc = vboxNetFltPortOsConnectInterface(pThis, pvIf, ppvIfData);
+    vboxNetFltRelease(pThis, false /* fBusy */);
+
+    return rc;
+}
+
+
+/**
+ * @copydoc INTNETTRUNKIFPORT::pfnDisconnectInterface
+ */
+static DECLCALLBACK(void) vboxNetFltPortDisconnectInterface(PINTNETTRUNKIFPORT pIfPort, void *pvIfData)
+{
+    PVBOXNETFLTINS  pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
+    int             rc;
+
+    /*
+     * Input validation.
+     */
+    AssertPtr(pThis);
+    Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
+
+    vboxNetFltRetain(pThis, false /* fBusy */);
+    rc = vboxNetFltPortOsDisconnectInterface(pThis, pvIfData);
+    vboxNetFltRelease(pThis, false /* fBusy */);
+    AssertRC(rc); /** @todo fix vboxNetFltPortOsDisconnectInterface. */
+}
+
+
+/**
+ * @copydoc INTNETTRUNKIFPORT::pfnDisconnectAndRelease
+ */
+static DECLCALLBACK(void) vboxNetFltPortDisconnectAndRelease(PINTNETTRUNKIFPORT pIfPort)
+{
+    PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
+
+    /*
+     * Serious paranoia.
+     */
+    AssertPtr(pThis);
+    Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
+    Assert(pThis->MyPort.u32VersionEnd == INTNETTRUNKIFPORT_VERSION);
+    AssertPtr(pThis->pGlobals);
+    Assert(pThis->hEventIdle != NIL_RTSEMEVENT);
+    Assert(pThis->hSpinlock != NIL_RTSPINLOCK);
+    Assert(pThis->szName[0]);
+
+    Assert(vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Connected);
+    Assert(pThis->enmTrunkState == INTNETTRUNKIFSTATE_DISCONNECTING);
+    Assert(!pThis->fRediscoveryPending);
+    Assert(!pThis->cBusy);
+
+    /*
+     * Disconnect and release it.
+     */
+    RTSpinlockAcquire(pThis->hSpinlock);
+    vboxNetFltSetState(pThis, kVBoxNetFltInsState_Disconnecting);
+    RTSpinlockRelease(pThis->hSpinlock);
+
+    vboxNetFltOsDisconnectIt(pThis);
+    pThis->pSwitchPort = NULL;
+
+#ifdef VBOXNETFLT_STATIC_CONFIG
+    RTSpinlockAcquire(pThis->hSpinlock);
+    vboxNetFltSetState(pThis, kVBoxNetFltInsState_Unconnected);
+    RTSpinlockRelease(pThis->hSpinlock);
+#endif
+
+    vboxNetFltRelease(pThis, false /* fBusy */);
+}
+
+
+/**
+ * Destroy a device that has been disconnected from the switch.
+ *
+ * @returns true if the instance is destroyed, false otherwise.
+ * @param   pThis               The instance to be destroyed. This is
+ *                              no longer valid when this function returns.
+ */
+static bool vboxNetFltDestroyInstance(PVBOXNETFLTINS pThis)
+{
+    PVBOXNETFLTGLOBALS pGlobals = pThis->pGlobals;
+    uint32_t cRefs = ASMAtomicUoReadU32((uint32_t volatile *)&pThis->cRefs);
+    int rc;
+    LogFlow(("vboxNetFltDestroyInstance: pThis=%p (%s)\n", pThis, pThis->szName));
+
+    /*
+     * Validate the state.
+     */
+#ifdef VBOXNETFLT_STATIC_CONFIG
+    Assert(   vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Disconnecting
+           || vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Unconnected);
+#else
+    Assert(vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Disconnecting);
+#endif
+    Assert(pThis->enmTrunkState == INTNETTRUNKIFSTATE_DISCONNECTING);
+    Assert(!pThis->fRediscoveryPending);
+    Assert(!pThis->cRefs);
+    Assert(!pThis->cBusy);
+    Assert(!pThis->pSwitchPort);
+
+    /*
+     * Make sure the state is 'disconnecting' / 'destroying' and let the OS
+     * specific code do its part of the cleanup outside the mutex.
+     */
+    rc = RTSemFastMutexRequest(pGlobals->hFastMtx); AssertRC(rc);
+    vboxNetFltSetState(pThis, kVBoxNetFltInsState_Disconnecting);
+    RTSemFastMutexRelease(pGlobals->hFastMtx);
+
+    vboxNetFltOsDeleteInstance(pThis);
+
+    /*
+     * Unlink the instance and free up its resources.
+     */
+    rc = RTSemFastMutexRequest(pGlobals->hFastMtx); AssertRC(rc);
+    vboxNetFltSetState(pThis, kVBoxNetFltInsState_Destroyed);
+    vboxNetFltUnlinkLocked(pGlobals, pThis);
+    RTSemFastMutexRelease(pGlobals->hFastMtx);
+
+    RTSemEventDestroy(pThis->hEventIdle);
+    pThis->hEventIdle = NIL_RTSEMEVENT;
+    RTSpinlockDestroy(pThis->hSpinlock);
+    pThis->hSpinlock = NIL_RTSPINLOCK;
+    RTMemFree(pThis);
+
+    NOREF(cRefs);
+
+    return true;
+}
+
+
+/**
+ * Releases a reference to the specified instance.
+ *
+ * This method will destroy the instance when the count reaches 0.
+ * It will also take care of decrementing the counter and idle wakeup.
+ *
+ * @param   pThis           The instance.
+ * @param   fBusy           Whether the busy counter should be decremented too.
+ */
+DECLHIDDEN(void) vboxNetFltRelease(PVBOXNETFLTINS pThis, bool fBusy)
+{
+    uint32_t cRefs;
+
+    /*
+     * Paranoid Android.
+     */
+    AssertPtr(pThis);
+    Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
+    Assert(pThis->MyPort.u32VersionEnd == INTNETTRUNKIFPORT_VERSION);
+    Assert(   vboxNetFltGetState(pThis) > kVBoxNetFltInsState_Invalid
+           && vboxNetFltGetState(pThis) < kVBoxNetFltInsState_Destroyed);
+    AssertPtr(pThis->pGlobals);
+    Assert(pThis->hEventIdle != NIL_RTSEMEVENT);
+    Assert(pThis->hSpinlock != NIL_RTSPINLOCK);
+    Assert(pThis->szName[0]);
+
+    /*
+     * Work the busy counter.
+     */
+    if (fBusy)
+    {
+        cRefs = ASMAtomicDecU32(&pThis->cBusy);
+        if (!cRefs)
+        {
+            int rc = RTSemEventSignal(pThis->hEventIdle);
+            AssertRC(rc);
+        }
+        else
+            Assert(cRefs < UINT32_MAX / 2);
+    }
+
+    /*
+     * The object reference counting.
+     */
+    cRefs = ASMAtomicDecU32(&pThis->cRefs);
+    if (!cRefs)
+        vboxNetFltDestroyInstance(pThis);
+    else
+        Assert(cRefs < UINT32_MAX / 2);
+}
+
+
+/**
+ * @copydoc INTNETTRUNKIFPORT::pfnRelease
+ */
+static DECLCALLBACK(void) vboxNetFltPortRelease(PINTNETTRUNKIFPORT pIfPort)
+{
+    PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
+    vboxNetFltRelease(pThis, false /* fBusy */);
+}
+
+
+/**
+ * @callback_method_impl{FNINTNETTRUNKIFPORTRELEASEBUSY}
+ */
+DECLHIDDEN(DECLCALLBACK(void)) vboxNetFltPortReleaseBusy(PINTNETTRUNKIFPORT pIfPort)
+{
+    PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
+    vboxNetFltRelease(pThis, true /*fBusy*/);
+}
+
+
+/**
+ * Retains a reference to the specified instance and a busy reference too.
+ *
+ * @param   pThis           The instance.
+ * @param   fBusy           Whether the busy counter should be incremented as well.
+ */
+DECLHIDDEN(void) vboxNetFltRetain(PVBOXNETFLTINS pThis, bool fBusy)
+{
+    uint32_t cRefs;
+
+    /*
+     * Paranoid Android.
+     */
+    AssertPtr(pThis);
+    Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
+    Assert(pThis->MyPort.u32VersionEnd == INTNETTRUNKIFPORT_VERSION);
+    Assert(   vboxNetFltGetState(pThis) > kVBoxNetFltInsState_Invalid
+           && vboxNetFltGetState(pThis) < kVBoxNetFltInsState_Destroyed);
+    AssertPtr(pThis->pGlobals);
+    Assert(pThis->hEventIdle != NIL_RTSEMEVENT);
+    Assert(pThis->hSpinlock != NIL_RTSPINLOCK);
+    Assert(pThis->szName[0]);
+
+    /*
+     * Retain the object.
+     */
+    cRefs = ASMAtomicIncU32(&pThis->cRefs);
+    Assert(cRefs > 1 && cRefs < UINT32_MAX / 2);
+
+    /*
+     * Work the busy counter.
+     */
+    if (fBusy)
+    {
+        cRefs = ASMAtomicIncU32(&pThis->cBusy);
+        Assert(cRefs > 0 && cRefs < UINT32_MAX / 2);
+    }
+
+    NOREF(cRefs);
+}
+
+
+/**
+ * Tries to retain the device as busy if the trunk is active.
+ *
+ * This is used before calling pfnRecv or pfnPreRecv.
+ *
+ * @returns true if we succeeded in retaining a busy reference to the active
+ *          device.  false if we failed.
+ * @param   pThis           The instance.
+ */
+DECLHIDDEN(bool) vboxNetFltTryRetainBusyActive(PVBOXNETFLTINS pThis)
+{
+    uint32_t        cRefs;
+    bool            fRc;
+
+    /*
+     * Paranoid Android.
+     */
+    AssertPtr(pThis);
+    Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
+    Assert(pThis->MyPort.u32VersionEnd == INTNETTRUNKIFPORT_VERSION);
+    Assert(   vboxNetFltGetState(pThis) > kVBoxNetFltInsState_Invalid
+           && vboxNetFltGetState(pThis) < kVBoxNetFltInsState_Destroyed);
+    AssertPtr(pThis->pGlobals);
+    Assert(pThis->hEventIdle != NIL_RTSEMEVENT);
+    Assert(pThis->hSpinlock != NIL_RTSPINLOCK);
+    Assert(pThis->szName[0]);
+
+    /*
+     * Do the retaining and checking behind the spinlock.
+     */
+    RTSpinlockAcquire(pThis->hSpinlock);
+    fRc = pThis->enmTrunkState == INTNETTRUNKIFSTATE_ACTIVE;
+    if (fRc)
+    {
+        cRefs = ASMAtomicIncU32(&pThis->cRefs);
+        AssertMsg(cRefs > 1 && cRefs < UINT32_MAX / 2, ("%d\n", cRefs)); NOREF(cRefs);
+
+        cRefs = ASMAtomicIncU32(&pThis->cBusy);
+        AssertMsg(cRefs >= 1 && cRefs < UINT32_MAX / 2, ("%d\n", cRefs)); NOREF(cRefs);
+    }
+    RTSpinlockRelease(pThis->hSpinlock);
+
+    return fRc;
+}
+
+
+/**
+ * Tries to retain the device as busy if the trunk is not disconnecting.
+ *
+ * This is used before reporting stuff to the internal network.
+ *
+ * @returns true if we succeeded in retaining a busy reference to the active
+ *          device.  false if we failed.
+ * @param   pThis           The instance.
+ */
+DECLHIDDEN(bool) vboxNetFltTryRetainBusyNotDisconnected(PVBOXNETFLTINS pThis)
+{
+    uint32_t        cRefs;
+    bool            fRc;
+
+    /*
+     * Paranoid Android.
+     */
+    AssertPtr(pThis);
+    Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
+    Assert(pThis->MyPort.u32VersionEnd == INTNETTRUNKIFPORT_VERSION);
+    Assert(   vboxNetFltGetState(pThis) > kVBoxNetFltInsState_Invalid
+           && vboxNetFltGetState(pThis) < kVBoxNetFltInsState_Destroyed);
+    AssertPtr(pThis->pGlobals);
+    Assert(pThis->hEventIdle != NIL_RTSEMEVENT);
+    Assert(pThis->hSpinlock != NIL_RTSPINLOCK);
+    Assert(pThis->szName[0]);
+
+    /*
+     * Do the retaining and checking behind the spinlock.
+     */
+    RTSpinlockAcquire(pThis->hSpinlock);
+    fRc =  pThis->enmTrunkState == INTNETTRUNKIFSTATE_ACTIVE
+        || pThis->enmTrunkState == INTNETTRUNKIFSTATE_INACTIVE;
+    if (fRc)
+    {
+        cRefs = ASMAtomicIncU32(&pThis->cRefs);
+        AssertMsg(cRefs > 1 && cRefs < UINT32_MAX / 2, ("%d\n", cRefs)); NOREF(cRefs);
+
+        cRefs = ASMAtomicIncU32(&pThis->cBusy);
+        AssertMsg(cRefs >= 1 && cRefs < UINT32_MAX / 2, ("%d\n", cRefs)); NOREF(cRefs);
+    }
+    RTSpinlockRelease(pThis->hSpinlock);
+
+    return fRc;
+}
+
+
+/**
+ * @copydoc INTNETTRUNKIFPORT::pfnRetain
+ */
+static DECLCALLBACK(void) vboxNetFltPortRetain(PINTNETTRUNKIFPORT pIfPort)
+{
+    PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
+    vboxNetFltRetain(pThis, false /* fBusy */);
+}
+
+
+/**
+ * Connects the instance to the specified switch port.
+ *
+ * Called while owning the lock. We're ASSUMING that the internal
+ * networking code is already owning an recursive mutex, so, there
+ * will be no deadlocks when vboxNetFltOsConnectIt calls back into
+ * it for setting preferences.
+ *
+ * @returns VBox status code.
+ * @param   pThis               The instance.
+ * @param   pSwitchPort         The port on the internal network 'switch'.
+ * @param   ppIfPort            Where to return our port interface.
+ */
+static int vboxNetFltConnectIt(PVBOXNETFLTINS pThis, PINTNETTRUNKSWPORT pSwitchPort, PINTNETTRUNKIFPORT *ppIfPort)
+{
+    int rc;
+
+    /*
+     * Validate state.
+     */
+    Assert(!pThis->fRediscoveryPending);
+    Assert(!pThis->cBusy);
+#ifdef VBOXNETFLT_STATIC_CONFIG
+    Assert(vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Unconnected);
+#else
+    Assert(vboxNetFltGetState(pThis) == kVBoxNetFltInsState_Initializing);
+#endif
+    Assert(pThis->enmTrunkState == INTNETTRUNKIFSTATE_INACTIVE);
+
+    /*
+     * Do the job.
+     * Note that we're calling the os stuff while owning the semaphore here.
+     */
+    pThis->pSwitchPort = pSwitchPort;
+    rc = vboxNetFltOsConnectIt(pThis);
+    if (RT_SUCCESS(rc))
+    {
+        vboxNetFltSetState(pThis, kVBoxNetFltInsState_Connected);
+        *ppIfPort = &pThis->MyPort;
+    }
+    else
+        pThis->pSwitchPort = NULL;
+
+    Assert(pThis->enmTrunkState == INTNETTRUNKIFSTATE_INACTIVE);
+    return rc;
+}
+
+
+/**
+ * Creates a new instance.
+ *
+ * The new instance will be in the suspended state in a dynamic config and in
+ * the inactive in a static one.
+ *
+ * Called without owning the lock, but will request is several times.
+ *
+ * @returns VBox status code.
+ * @param   pGlobals            The globals.
+ * @param   pszName             The instance name.
+ * @param   pSwitchPort         The port on the switch that we're connected with (dynamic only).
+ * @param   fNoPromisc          Do not attempt going into promiscuous mode.
+ * @param   pvContext           Context argument for vboxNetFltOsInitInstance.
+ * @param   ppIfPort            Where to store the pointer to our port interface (dynamic only).
+ */
+static int vboxNetFltNewInstance(PVBOXNETFLTGLOBALS pGlobals, const char *pszName, PINTNETTRUNKSWPORT pSwitchPort,
+                                 bool fNoPromisc, void *pvContext, PINTNETTRUNKIFPORT *ppIfPort)
+{
+    /*
+     * Allocate and initialize a new instance before requesting the mutex.
+     * Note! That in a static config we'll initialize the trunk state to
+     *       disconnecting and flip it in vboxNetFltFactoryCreateAndConnect
+     *       later on.  This better reflext the state and it works better with
+     *       assertions in the destruction path.
+     */
+    int             rc;
+    size_t const    cchName = strlen(pszName);
+    PVBOXNETFLTINS  pNew = (PVBOXNETFLTINS)RTMemAllocZVar(RT_UOFFSETOF_DYN(VBOXNETFLTINS, szName[cchName + 1]));
+    if (!pNew)
+        return VERR_INTNET_FLT_IF_FAILED;
+    AssertMsg(((uintptr_t)pNew & 7) == 0, ("%p LB %#x\n", pNew, RT_UOFFSETOF_DYN(VBOXNETFLTINS, szName[cchName + 1])));
+    pNew->pNext                         = NULL;
+    pNew->MyPort.u32Version             = INTNETTRUNKIFPORT_VERSION;
+    pNew->MyPort.pfnRetain              = vboxNetFltPortRetain;
+    pNew->MyPort.pfnRelease             = vboxNetFltPortRelease;
+    pNew->MyPort.pfnDisconnectAndRelease= vboxNetFltPortDisconnectAndRelease;
+    pNew->MyPort.pfnSetState            = vboxNetFltPortSetState;
+    pNew->MyPort.pfnWaitForIdle         = vboxNetFltPortWaitForIdle;
+    pNew->MyPort.pfnXmit                = vboxNetFltPortXmit;
+    pNew->MyPort.pfnNotifyMacAddress    = vboxNetFltPortNotifyMacAddress;
+    pNew->MyPort.pfnConnectInterface    = vboxNetFltPortConnectInterface;
+    pNew->MyPort.pfnDisconnectInterface = vboxNetFltPortDisconnectInterface;
+    pNew->MyPort.u32VersionEnd          = INTNETTRUNKIFPORT_VERSION;
+    pNew->pSwitchPort                   = pSwitchPort;
+    pNew->pGlobals                      = pGlobals;
+    pNew->hSpinlock                     = NIL_RTSPINLOCK;
+    pNew->enmState                      = kVBoxNetFltInsState_Initializing;
+#ifdef VBOXNETFLT_STATIC_CONFIG
+    pNew->enmTrunkState                 = INTNETTRUNKIFSTATE_DISCONNECTING;
+#else
+    pNew->enmTrunkState                 = INTNETTRUNKIFSTATE_INACTIVE;
+#endif
+    pNew->fDisconnectedFromHost         = false;
+    pNew->fRediscoveryPending           = false;
+    pNew->fDisablePromiscuous           = fNoPromisc;
+    pNew->NanoTSLastRediscovery         = INT64_MAX;
+    pNew->cRefs                         = 1;
+    pNew->cBusy                         = 0;
+    pNew->hEventIdle                    = NIL_RTSEMEVENT;
+    memcpy(pNew->szName, pszName, cchName + 1);
+
+    rc = RTSpinlockCreate(&pNew->hSpinlock, RTSPINLOCK_FLAGS_INTERRUPT_SAFE, "VBoxNetFltNewInstance");
+    if (RT_SUCCESS(rc))
+    {
+        rc = RTSemEventCreate(&pNew->hEventIdle);
+        if (RT_SUCCESS(rc))
+        {
+            rc = vboxNetFltOsPreInitInstance(pNew);
+            if (RT_SUCCESS(rc))
+            {
+                /*
+                 * Insert the instance into the chain, checking for
+                 * duplicates first of course (race).
+                 */
+                rc = RTSemFastMutexRequest(pGlobals->hFastMtx);
+                if (RT_SUCCESS(rc))
+                {
+                    if (!vboxNetFltFindInstanceLocked(pGlobals, pszName))
+                    {
+                        pNew->pNext = pGlobals->pInstanceHead;
+                        pGlobals->pInstanceHead = pNew;
+                        RTSemFastMutexRelease(pGlobals->hFastMtx);
+
+                        /*
+                         * Call the OS specific initialization code.
+                         */
+                        rc = vboxNetFltOsInitInstance(pNew, pvContext);
+                        RTSemFastMutexRequest(pGlobals->hFastMtx);
+                        if (RT_SUCCESS(rc))
+                        {
+#ifdef VBOXNETFLT_STATIC_CONFIG
+                            /*
+                             * Static instances are unconnected at birth.
+                             */
+                            Assert(!pSwitchPort);
+                            pNew->enmState = kVBoxNetFltInsState_Unconnected;
+                            RTSemFastMutexRelease(pGlobals->hFastMtx);
+                            *ppIfPort = &pNew->MyPort;
+                            return rc;
+
+#else  /* !VBOXNETFLT_STATIC_CONFIG */
+                            /*
+                             * Connect it as well, the OS specific bits has to be done outside
+                             * the lock as they may call back to into intnet.
+                             */
+                            rc = vboxNetFltConnectIt(pNew, pSwitchPort, ppIfPort);
+                            if (RT_SUCCESS(rc))
+                            {
+                                RTSemFastMutexRelease(pGlobals->hFastMtx);
+                                Assert(*ppIfPort == &pNew->MyPort);
+                                return rc;
+                            }
+
+                            /* Bail out (failed). */
+                            vboxNetFltOsDeleteInstance(pNew);
+#endif /* !VBOXNETFLT_STATIC_CONFIG */
+                        }
+                        vboxNetFltUnlinkLocked(pGlobals, pNew);
+                    }
+                    else
+                        rc = VERR_INTNET_FLT_IF_BUSY;
+                    RTSemFastMutexRelease(pGlobals->hFastMtx);
+                }
+            }
+            RTSemEventDestroy(pNew->hEventIdle);
+        }
+        RTSpinlockDestroy(pNew->hSpinlock);
+    }
+
+    RTMemFree(pNew);
+    return rc;
+}
+
+
+#ifdef VBOXNETFLT_STATIC_CONFIG
+/**
+ * Searches for the NetFlt instance by its name and creates the new one if not found.
+ *
+ * @returns VBox status code.
+ * @retval  VINF_SUCCESS and *ppInstance if a new instance was created.
+ * @retval  VINF_ALREADY_INITIALIZED and *ppInstance if an instance already exists.
+ *
+ * @param   pGlobal     Pointer to the globals.
+ * @param   pszName     The instance name.
+ * @param   ppInstance  Where to return the instance pointer on success.
+ * @param   pvContext   Context which needs to be passed along to vboxNetFltOsInitInstance.
+ */
+DECLHIDDEN(int) vboxNetFltSearchCreateInstance(PVBOXNETFLTGLOBALS pGlobals, const char *pszName, PVBOXNETFLTINS *ppInstance, void *pvContext)
+{
+    PINTNETTRUNKIFPORT pIfPort;
+    PVBOXNETFLTINS pCur;
+    VBOXNETFTLINSSTATE enmState;
+    int rc;
+
+    *ppInstance = NULL;
+    rc = RTSemFastMutexRequest(pGlobals->hFastMtx);
+    AssertRCReturn(rc, rc);
+
+    /*
+     * Look for an existing instance in the list.
+     *
+     * There might be an existing one in the list if the driver was unbound
+     * while it was connected to an internal network. We're running into
+     * a destruction race that is a bit similar to the one in
+     * vboxNetFltFactoryCreateAndConnect, only the roles are reversed
+     * and we're not in a position to back down. Instead of backing down
+     * we'll delay a bit giving the other thread time to complete the
+     * destructor.
+     */
+    pCur = vboxNetFltFindInstanceLocked(pGlobals, pszName);
+    while (pCur)
+    {
+        uint32_t cRefs = ASMAtomicIncU32(&pCur->cRefs);
+        if (cRefs > 1)
+        {
+            enmState = vboxNetFltGetState(pCur);
+            switch (enmState)
+            {
+                case kVBoxNetFltInsState_Unconnected:
+                case kVBoxNetFltInsState_Connected:
+                case kVBoxNetFltInsState_Disconnecting:
+                    if (pCur->fDisconnectedFromHost)
+                    {
+                        /* Wait for it to exit the transitional disconnecting
+                           state. It might otherwise be running the risk of
+                           upsetting the OS specific code...  */
+                        /** @todo This reconnect stuff should be serialized correctly for static
+                         *        devices. Shouldn't it? In the dynamic case we're using the INTNET
+                         *        outbound thunk lock, but that doesn't quite cut it here, or does
+                         *        it? We could either transition to initializing  or make a callback
+                         *        while owning the mutex here... */
+                        if (enmState == kVBoxNetFltInsState_Disconnecting)
+                        {
+                            do
+                            {
+                                RTSemFastMutexRelease(pGlobals->hFastMtx);
+                                RTThreadSleep(2); /* (2ms) */
+                                RTSemFastMutexRequest(pGlobals->hFastMtx);
+                                enmState = vboxNetFltGetState(pCur);
+                            }
+                            while (enmState == kVBoxNetFltInsState_Disconnecting);
+                            AssertMsg(enmState == kVBoxNetFltInsState_Unconnected, ("%d\n", enmState));
+                            Assert(pCur->fDisconnectedFromHost);
+                        }
+
+                        RTSemFastMutexRelease(pGlobals->hFastMtx);
+                        *ppInstance = pCur;
+                        return VINF_ALREADY_INITIALIZED;
+                    }
+                    /* fall thru */
+
+                default:
+                {
+                    bool fDfH = pCur->fDisconnectedFromHost;
+                    RTSemFastMutexRelease(pGlobals->hFastMtx);
+                    vboxNetFltRelease(pCur, false /* fBusy */);
+                    LogRel(("VBoxNetFlt: Huh? An instance of '%s' already exists! [pCur=%p cRefs=%d fDfH=%RTbool enmState=%d]\n",
+                            pszName, pCur, cRefs - 1, fDfH, enmState));
+                    *ppInstance = NULL;
+                    return VERR_INTNET_FLT_IF_BUSY;
+                }
+            }
+        }
+
+        /* Zero references, it's being destroyed. Delay a bit so the destructor
+           can finish its work and try again. (vboxNetFltNewInstance will fail
+           with duplicate name if we don't.) */
+# ifdef RT_STRICT
+        Assert(cRefs == 1);
+        enmState = vboxNetFltGetState(pCur);
+        AssertMsg(   enmState == kVBoxNetFltInsState_Unconnected
+                  || enmState == kVBoxNetFltInsState_Disconnecting
+                  || enmState == kVBoxNetFltInsState_Destroyed, ("%d\n", enmState));
+# endif
+        ASMAtomicDecU32(&pCur->cRefs);
+        RTSemFastMutexRelease(pGlobals->hFastMtx);
+        RTThreadSleep(2); /* (2ms) */
+        rc = RTSemFastMutexRequest(pGlobals->hFastMtx);
+        AssertRCReturn(rc, rc);
+
+        /* try again */
+        pCur = vboxNetFltFindInstanceLocked(pGlobals, pszName);
+    }
+
+    RTSemFastMutexRelease(pGlobals->hFastMtx);
+
+    /*
+     * Try create a new instance.
+     * (fNoPromisc is overridden in the vboxNetFltFactoryCreateAndConnect path, so pass true here.)
+     */
+    rc = vboxNetFltNewInstance(pGlobals, pszName, NULL, true /* fNoPromisc */, pvContext, &pIfPort);
+    if (RT_SUCCESS(rc))
+        *ppInstance = IFPORT_2_VBOXNETFLTINS(pIfPort);
+    else
+        *ppInstance = NULL;
+
+    return rc;
+}
+#endif /* VBOXNETFLT_STATIC_CONFIG */
+
+
+/**
+ * @copydoc INTNETTRUNKFACTORY::pfnCreateAndConnect
+ */
+static DECLCALLBACK(int) vboxNetFltFactoryCreateAndConnect(PINTNETTRUNKFACTORY pIfFactory, const char *pszName,
+                                                           PINTNETTRUNKSWPORT pSwitchPort, uint32_t fFlags,
+                                                           PINTNETTRUNKIFPORT *ppIfPort)
+{
+    PVBOXNETFLTGLOBALS pGlobals = (PVBOXNETFLTGLOBALS)((uint8_t *)pIfFactory - RT_UOFFSETOF(VBOXNETFLTGLOBALS, TrunkFactory));
+    PVBOXNETFLTINS pCur;
+    int rc;
+
+    LogFlow(("vboxNetFltFactoryCreateAndConnect: pszName=%p:{%s} fFlags=%#x\n", pszName, pszName, fFlags));
+    Assert(pGlobals->cFactoryRefs > 0);
+    AssertMsgReturn(!(fFlags & ~(INTNETTRUNKFACTORY_FLAG_NO_PROMISC)),
+                    ("%#x\n", fFlags), VERR_INVALID_PARAMETER);
+
+    /*
+     * Static: Find instance, check if busy, connect if not.
+     * Dynamic: Check for duplicate / busy interface instance.
+     */
+    rc = RTSemFastMutexRequest(pGlobals->hFastMtx);
+    AssertRCReturn(rc, rc);
+
+//#if defined(VBOXNETADP) && defined(RT_OS_WINDOWS)
+//    /* temporary hack to pick up the first adapter */
+//    pCur = pGlobals->pInstanceHead; /** @todo Don't for get to remove this temporary hack... :-) */
+//#else
+    pCur = vboxNetFltFindInstanceLocked(pGlobals, pszName);
+//#endif
+    if (pCur)
+    {
+#ifdef VBOXNETFLT_STATIC_CONFIG
+        /* Try grab a reference. If the count had already reached zero we're racing the
+           destructor code and must back down. */
+        uint32_t cRefs = ASMAtomicIncU32(&pCur->cRefs);
+        if (cRefs > 1)
+        {
+            if (vboxNetFltGetState(pCur) == kVBoxNetFltInsState_Unconnected)
+            {
+                pCur->enmTrunkState = INTNETTRUNKIFSTATE_INACTIVE; /** @todo protect me? */
+                pCur->fDisablePromiscuous = !!(fFlags & INTNETTRUNKFACTORY_FLAG_NO_PROMISC);
+                rc = vboxNetFltConnectIt(pCur, pSwitchPort, ppIfPort);
+                if (RT_SUCCESS(rc))
+                    pCur = NULL; /* Don't release it, reference given to the caller. */
+                else
+                    pCur->enmTrunkState = INTNETTRUNKIFSTATE_DISCONNECTING;
+            }
+            else
+                rc = VERR_INTNET_FLT_IF_BUSY;
+        }
+        else
+        {
+            Assert(cRefs == 1);
+            ASMAtomicDecU32(&pCur->cRefs);
+            pCur = NULL; /* nothing to release */
+            rc = VERR_INTNET_FLT_IF_NOT_FOUND;
+        }
+
+        RTSemFastMutexRelease(pGlobals->hFastMtx);
+        if (pCur)
+            vboxNetFltRelease(pCur, false /* fBusy */);
+#else
+        rc = VERR_INTNET_FLT_IF_BUSY;
+        RTSemFastMutexRelease(pGlobals->hFastMtx);
+#endif
+        LogFlow(("vboxNetFltFactoryCreateAndConnect: returns %Rrc\n", rc));
+        return rc;
+    }
+
+    RTSemFastMutexRelease(pGlobals->hFastMtx);
+
+#ifdef VBOXNETFLT_STATIC_CONFIG
+    rc = VERR_INTNET_FLT_IF_NOT_FOUND;
+#else
+    /*
+     * Dynamically create a new instance.
+     */
+    rc = vboxNetFltNewInstance(pGlobals,
+                               pszName,
+                               pSwitchPort,
+                               !!(fFlags & INTNETTRUNKFACTORY_FLAG_NO_PROMISC),
+                               NULL,
+                               ppIfPort);
+#endif
+    LogFlow(("vboxNetFltFactoryCreateAndConnect: returns %Rrc\n", rc));
+    return rc;
+}
+
+
+/**
+ * @copydoc INTNETTRUNKFACTORY::pfnRelease
+ */
+static DECLCALLBACK(void) vboxNetFltFactoryRelease(PINTNETTRUNKFACTORY pIfFactory)
+{
+    PVBOXNETFLTGLOBALS pGlobals = (PVBOXNETFLTGLOBALS)((uint8_t *)pIfFactory - RT_UOFFSETOF(VBOXNETFLTGLOBALS, TrunkFactory));
+
+    int32_t cRefs = ASMAtomicDecS32(&pGlobals->cFactoryRefs);
+    Assert(cRefs >= 0); NOREF(cRefs);
+    LogFlow(("vboxNetFltFactoryRelease: cRefs=%d (new)\n", cRefs));
+}
+
+
+/**
+ * Implements the SUPDRV component factor interface query method.
+ *
+ * @returns Pointer to an interface. NULL if not supported.
+ *
+ * @param   pSupDrvFactory      Pointer to the component factory registration structure.
+ * @param   pSession            The session - unused.
+ * @param   pszInterfaceUuid    The factory interface id.
+ */
+static DECLCALLBACK(void *) vboxNetFltQueryFactoryInterface(PCSUPDRVFACTORY pSupDrvFactory, PSUPDRVSESSION pSession,
+                                                            const char *pszInterfaceUuid)
+{
+    PVBOXNETFLTGLOBALS pGlobals = (PVBOXNETFLTGLOBALS)((uint8_t *)pSupDrvFactory - RT_UOFFSETOF(VBOXNETFLTGLOBALS, SupDrvFactory));
+
+    /*
+     * Convert the UUID strings and compare them.
+     */
+    RTUUID UuidReq;
+    int rc = RTUuidFromStr(&UuidReq, pszInterfaceUuid);
+    if (RT_SUCCESS(rc))
+    {
+        if (!RTUuidCompareStr(&UuidReq, INTNETTRUNKFACTORY_UUID_STR))
+        {
+            ASMAtomicIncS32(&pGlobals->cFactoryRefs);
+            return &pGlobals->TrunkFactory;
+        }
+#ifdef LOG_ENABLED
+        /* log legacy queries */
+        /* else if (!RTUuidCompareStr(&UuidReq, INTNETTRUNKFACTORY_V1_UUID_STR))
+            Log(("VBoxNetFlt: V1 factory query\n"));
+        */
+        else
+            Log(("VBoxNetFlt: unknown factory interface query (%s)\n", pszInterfaceUuid));
+#endif
+    }
+    else
+        Log(("VBoxNetFlt: rc=%Rrc, uuid=%s\n", rc, pszInterfaceUuid));
+
+    RT_NOREF1(pSession);
+    return NULL;
+}
+
+
+/**
+ * Checks whether the VBoxNetFlt wossname can be unloaded.
+ *
+ * This will return false if someone is currently using the module.
+ *
+ * @returns true if it's relatively safe to unload it, otherwise false.
+ * @param   pGlobals        Pointer to the globals.
+ */
+DECLHIDDEN(bool) vboxNetFltCanUnload(PVBOXNETFLTGLOBALS pGlobals)
+{
+    int rc = RTSemFastMutexRequest(pGlobals->hFastMtx);
+    bool fRc = !pGlobals->pInstanceHead
+            && pGlobals->cFactoryRefs <= 0;
+    RTSemFastMutexRelease(pGlobals->hFastMtx);
+    AssertRC(rc);
+    return fRc;
+}
+
+
+/**
+ * Try to close the IDC connection to SUPDRV if established.
+ *
+ * @returns VBox status code.
+ * @retval  VINF_SUCCESS on success.
+ * @retval  VERR_WRONG_ORDER if we're busy.
+ *
+ * @param   pGlobals        Pointer to the globals.
+ *
+ * @sa      vboxNetFltTryDeleteIdcAndGlobals()
+ */
+DECLHIDDEN(int) vboxNetFltTryDeleteIdc(PVBOXNETFLTGLOBALS pGlobals)
+{
+    int rc;
+
+    Assert(pGlobals->hFastMtx != NIL_RTSEMFASTMUTEX);
+
+    /*
+     * Check before trying to deregister the factory.
+     */
+    if (!vboxNetFltCanUnload(pGlobals))
+        return VERR_WRONG_ORDER;
+
+    if (!pGlobals->fIDCOpen)
+        rc = VINF_SUCCESS;
+    else
+    {
+        /*
+         * Disconnect from SUPDRV and check that nobody raced us,
+         * reconnect if that should happen.
+         */
+        rc = SUPR0IdcComponentDeregisterFactory(&pGlobals->SupDrvIDC, &pGlobals->SupDrvFactory);
+        AssertRC(rc);
+        if (!vboxNetFltCanUnload(pGlobals))
+        {
+            rc = SUPR0IdcComponentRegisterFactory(&pGlobals->SupDrvIDC, &pGlobals->SupDrvFactory);
+            AssertRC(rc);
+            return VERR_WRONG_ORDER;
+        }
+
+        SUPR0IdcClose(&pGlobals->SupDrvIDC);
+        pGlobals->fIDCOpen = false;
+    }
+
+    return rc;
+}
+
+
+/**
+ * Establishes the IDC connection to SUPDRV and registers our component factory.
+ *
+ * @returns VBox status code.
+ * @param   pGlobals    Pointer to the globals.
+ * @sa      vboxNetFltInitGlobalsAndIdc().
+ */
+DECLHIDDEN(int) vboxNetFltInitIdc(PVBOXNETFLTGLOBALS pGlobals)
+{
+    int rc;
+    Assert(!pGlobals->fIDCOpen);
+
+    /*
+     * Establish a connection to SUPDRV and register our component factory.
+     */
+    rc = SUPR0IdcOpen(&pGlobals->SupDrvIDC, 0 /* iReqVersion = default */, 0 /* iMinVersion = default */, NULL, NULL, NULL);
+    if (RT_SUCCESS(rc))
+    {
+        rc = SUPR0IdcComponentRegisterFactory(&pGlobals->SupDrvIDC, &pGlobals->SupDrvFactory);
+        if (RT_SUCCESS(rc))
+        {
+            pGlobals->fIDCOpen = true;
+            Log(("VBoxNetFlt: pSession=%p\n", SUPR0IdcGetSession(&pGlobals->SupDrvIDC)));
+            return rc;
+        }
+
+        /* bail out. */
+        LogRel(("VBoxNetFlt: Failed to register component factory, rc=%Rrc\n", rc));
+        SUPR0IdcClose(&pGlobals->SupDrvIDC);
+    }
+
+    return rc;
+}
+
+
+/**
+ * Deletes the globals.
+ *
+ * This must be called after the IDC connection has been closed,
+ * see vboxNetFltTryDeleteIdc().
+ *
+ * @param   pGlobals        Pointer to the globals.
+ * @sa      vboxNetFltTryDeleteIdcAndGlobals()
+ */
+DECLHIDDEN(void) vboxNetFltDeleteGlobals(PVBOXNETFLTGLOBALS pGlobals)
+{
+    Assert(!pGlobals->fIDCOpen);
+
+    /*
+     * Release resources.
+     */
+    RTSemFastMutexDestroy(pGlobals->hFastMtx);
+    pGlobals->hFastMtx = NIL_RTSEMFASTMUTEX;
+}
+
+
+/**
+ * Initializes the globals.
+ *
+ * @returns VBox status code.
+ * @param   pGlobals        Pointer to the globals.
+ * @sa      vboxNetFltInitGlobalsAndIdc().
+ */
+DECLHIDDEN(int) vboxNetFltInitGlobals(PVBOXNETFLTGLOBALS pGlobals)
+{
+    /*
+     * Initialize the common portions of the structure.
+     */
+    int rc = RTSemFastMutexCreate(&pGlobals->hFastMtx);
+    if (RT_SUCCESS(rc))
+    {
+        pGlobals->pInstanceHead = NULL;
+
+        pGlobals->TrunkFactory.pfnRelease = vboxNetFltFactoryRelease;
+        pGlobals->TrunkFactory.pfnCreateAndConnect = vboxNetFltFactoryCreateAndConnect;
+#if defined(RT_OS_WINDOWS) && defined(VBOXNETADP)
+        memcpy(pGlobals->SupDrvFactory.szName, "VBoxNetAdp", sizeof("VBoxNetAdp"));
+#else
+        memcpy(pGlobals->SupDrvFactory.szName, "VBoxNetFlt", sizeof("VBoxNetFlt"));
+#endif
+        pGlobals->SupDrvFactory.pfnQueryFactoryInterface = vboxNetFltQueryFactoryInterface;
+        pGlobals->fIDCOpen = false;
+
+        return rc;
+    }
+
+    return rc;
+}
+
+
+/**
+ * Called by the native part when the OS wants the driver to unload.
+ *
+ * @returns VINF_SUCCESS on success, VERR_WRONG_ORDER if we're busy.
+ *
+ * @param   pGlobals        Pointer to the globals.
+ */
+DECLHIDDEN(int) vboxNetFltTryDeleteIdcAndGlobals(PVBOXNETFLTGLOBALS pGlobals)
+{
+    int rc = vboxNetFltTryDeleteIdc(pGlobals);
+    if (RT_SUCCESS(rc))
+        vboxNetFltDeleteGlobals(pGlobals);
+    return rc;
+}
+
+
+/**
+ * Called by the native driver/kext module initialization routine.
+ *
+ * It will initialize the common parts of the globals, assuming the caller
+ * has already taken care of the OS specific bits, and establish the IDC
+ * connection to SUPDRV.
+ *
+ * @returns VBox status code.
+ * @param   pGlobals    Pointer to the globals.
+ */
+DECLHIDDEN(int) vboxNetFltInitGlobalsAndIdc(PVBOXNETFLTGLOBALS pGlobals)
+{
+    /*
+     * Initialize the common portions of the structure.
+     */
+    int rc = vboxNetFltInitGlobals(pGlobals);
+    if (RT_SUCCESS(rc))
+    {
+        rc = vboxNetFltInitIdc(pGlobals);
+        if (RT_SUCCESS(rc))
+            return rc;
+
+        /* bail out. */
+        vboxNetFltDeleteGlobals(pGlobals);
+    }
+
+    return rc;
+}
+
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/VBoxNetFlt.rc b/src/VBox/HostDrivers/VBoxNetFlt/VBoxNetFlt.rc
new file mode 100644
index 00000000..66daaadb
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/VBoxNetFlt.rc
@@ -0,0 +1,59 @@
+/* $Id: VBoxNetFlt.rc $ */
+/** @file
+ * VBoxNetFlt - Resource file containing version info and icon.
+ */
+/*
+ * Copyright (C) 2014-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#include <windows.h>
+#include <VBox/version.h>
+
+LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
+
+VS_VERSION_INFO VERSIONINFO
+   FILEVERSION      VBOX_RC_FILE_VERSION
+   PRODUCTVERSION   VBOX_RC_FILE_VERSION
+   FILEFLAGSMASK    VS_FFI_FILEFLAGSMASK
+   FILEFLAGS        VBOX_RC_FILE_FLAGS
+   FILEOS           VBOX_RC_FILE_OS
+   FILETYPE         VBOX_RC_TYPE_DRV
+   FILESUBTYPE      VFT2_DRV_NETWORK
+BEGIN
+   BLOCK "StringFileInfo"
+   BEGIN
+      BLOCK "040904b0"
+      BEGIN
+         VALUE "FileDescription",  "VirtualBox NDIS 6.0 Lightweight Filter Driver\0"
+         VALUE "InternalName",     "VBoxNetLwf\0"
+         VALUE "OriginalFilename", "VBoxNetLwf.sys\0"
+         VALUE "CompanyName",      VBOX_RC_COMPANY_NAME
+         VALUE "FileVersion",      VBOX_RC_FILE_VERSION_STR
+         VALUE "LegalCopyright",   VBOX_RC_LEGAL_COPYRIGHT
+         VALUE "ProductName",      VBOX_RC_PRODUCT_NAME_STR
+         VALUE "ProductVersion",   VBOX_RC_PRODUCT_VERSION_STR
+         VBOX_RC_MORE_STRINGS
+      END
+   END
+   BLOCK "VarFileInfo"
+   BEGIN
+      VALUE "Translation", 0x409, 1200
+   END
+END
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/VBoxNetFltInternal.h b/src/VBox/HostDrivers/VBoxNetFlt/VBoxNetFltInternal.h
new file mode 100644
index 00000000..f1f7d6f8
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/VBoxNetFltInternal.h
@@ -0,0 +1,490 @@
+/* $Id: VBoxNetFltInternal.h $ */
+/** @file
+ * VBoxNetFlt - Network Filter Driver (Host), Internal Header.
+ */
+
+/*
+ * Copyright (C) 2008-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#ifndef VBOX_INCLUDED_SRC_VBoxNetFlt_VBoxNetFltInternal_h
+#define VBOX_INCLUDED_SRC_VBoxNetFlt_VBoxNetFltInternal_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <VBox/sup.h>
+#include <VBox/intnet.h>
+#include <iprt/semaphore.h>
+#include <iprt/assert.h>
+
+
+RT_C_DECLS_BEGIN
+
+/** Pointer to the globals. */
+typedef struct VBOXNETFLTGLOBALS *PVBOXNETFLTGLOBALS;
+
+
+/**
+ * The state of a filter driver instance.
+ *
+ * The state machine differs a bit between the platforms because of
+ * the way we hook into the stack. On some hosts we can dynamically
+ * attach when required (on CreateInstance) and on others we will
+ * have to connect when the network stack is bound up. These modes
+ * are called static and dynamic config and governed at compile time
+ * by the VBOXNETFLT_STATIC_CONFIG define.
+ *
+ * See sec_netflt_msc for more details on locking and synchronization.
+ */
+typedef enum VBOXNETFTLINSSTATE
+{
+    /** The usual invalid state. */
+    kVBoxNetFltInsState_Invalid = 0,
+    /** Initialization.
+     * We've reserved the interface name but need to attach to the actual
+     * network interface outside the lock to avoid deadlocks.
+     * In the dynamic case this happens during a Create(Instance) call.
+     * In the static case it happens during driver initialization. */
+    kVBoxNetFltInsState_Initializing,
+#ifdef VBOXNETFLT_STATIC_CONFIG
+    /** Unconnected, not hooked up to a switch (static only).
+     * The filter driver instance has been instantiated and hooked up,
+     * waiting to be connected to an internal network. */
+    kVBoxNetFltInsState_Unconnected,
+#endif
+    /** Connected to an internal network. */
+    kVBoxNetFltInsState_Connected,
+    /** Disconnecting from the internal network and possibly the host network interface.
+     * Partly for reasons of deadlock avoidance again. */
+    kVBoxNetFltInsState_Disconnecting,
+    /** The instance has been disconnected from both the host and the internal network. */
+    kVBoxNetFltInsState_Destroyed,
+
+    /** The habitual 32-bit enum hack.  */
+    kVBoxNetFltInsState_32BitHack = 0x7fffffff
+} VBOXNETFTLINSSTATE;
+
+
+/**
+ * The per-instance data of the VBox filter driver.
+ *
+ * This is data associated with a network interface / NIC / wossname which
+ * the filter driver has been or may be attached to. When possible it is
+ * attached dynamically, but this may not be possible on all OSes so we have
+ * to be flexible about things.
+ *
+ * A network interface / NIC / wossname can only have one filter driver
+ * instance attached to it. So, attempts at connecting an internal network
+ * to an interface that's already in use (connected to another internal network)
+ * will result in a VERR_SHARING_VIOLATION.
+ *
+ * Only one internal network can connect to a filter driver instance.
+ */
+typedef struct VBOXNETFLTINS
+{
+    /** Pointer to the next interface in the list. (VBOXNETFLTGLOBAL::pInstanceHead) */
+    struct VBOXNETFLTINS *pNext;
+    /** Our RJ-45 port.
+     * This is what the internal network plugs into. */
+    INTNETTRUNKIFPORT MyPort;
+    /** The RJ-45 port on the INTNET "switch".
+     * This is what we're connected to. */
+    PINTNETTRUNKSWPORT pSwitchPort;
+    /** Pointer to the globals. */
+    PVBOXNETFLTGLOBALS pGlobals;
+
+    /** The spinlock protecting the state variables and host interface handle. */
+    RTSPINLOCK hSpinlock;
+    /** The current interface state. */
+    VBOXNETFTLINSSTATE volatile enmState;
+    /** The trunk state. */
+    INTNETTRUNKIFSTATE volatile enmTrunkState;
+    bool volatile fActive;
+    /** Disconnected from the host network interface. */
+    bool volatile fDisconnectedFromHost;
+    /** Rediscovery is pending.
+     * cBusy will never reach zero during rediscovery, so which
+     * takes care of serializing rediscovery and disconnecting. */
+    bool volatile fRediscoveryPending;
+    /** Whether we should not attempt to set promiscuous mode at all. */
+    bool fDisablePromiscuous;
+#if (ARCH_BITS == 32) && defined(__GNUC__)
+#if 0
+    uint32_t u32Padding;    /**< Alignment padding, will assert in ASMAtomicUoWriteU64 otherwise. */
+#endif
+#endif
+    /** The timestamp of the last rediscovery. */
+    uint64_t volatile NanoTSLastRediscovery;
+    /** Reference count. */
+    uint32_t volatile cRefs;
+    /** The busy count.
+     * This counts the number of current callers and pending packet. */
+    uint32_t volatile cBusy;
+    /** The event that is signaled when we go idle and that pfnWaitForIdle blocks on. */
+    RTSEMEVENT hEventIdle;
+
+    /** @todo move MacAddr out of this structure!  */
+    union
+    {
+#ifdef VBOXNETFLT_OS_SPECFIC
+        struct
+        {
+# if defined(RT_OS_DARWIN)
+            /** @name Darwin instance data.
+             * @{ */
+            /** Pointer to the darwin network interface we're attached to.
+             * This is treated as highly volatile and should only be read and retained
+             * while owning hSpinlock. Releasing references to this should not be done
+             * while owning it though as we might end up destroying it in some paths. */
+            ifnet_t volatile pIfNet;
+            /** The interface filter handle.
+             * Same access rules as with pIfNet. */
+            interface_filter_t volatile pIfFilter;
+            /** Whether we've need to set promiscuous mode when the interface comes up. */
+            bool volatile fNeedSetPromiscuous;
+            /** Whether we've successfully put the interface into to promiscuous mode.
+             * This is for dealing with the ENETDOWN case. */
+            bool volatile fSetPromiscuous;
+            /** The MAC address of the interface. */
+            RTMAC MacAddr;
+            /** PF_SYSTEM socket to listen for events (XXX: globals?) */
+            socket_t pSysSock;
+            /** @} */
+# elif defined(RT_OS_LINUX)
+            /** @name Linux instance data
+             * @{ */
+            /** Pointer to the device. */
+            struct net_device * volatile pDev;
+            /** MTU of host's interface. */
+            uint32_t cbMtu;
+            /** Whether we've successfully put the interface into to promiscuous mode.
+             * This is for dealing with the ENETDOWN case. */
+            bool volatile fPromiscuousSet;
+            /** Whether device exists and physically attached. */
+            bool volatile fRegistered;
+            /** Whether our packet handler is installed. */
+            bool volatile fPacketHandler;
+            /** The MAC address of the interface. */
+            RTMAC MacAddr;
+            struct notifier_block Notifier; /* netdevice */
+            struct notifier_block NotifierIPv4;
+            struct notifier_block NotifierIPv6;
+            struct packet_type    PacketType;
+#  ifndef VBOXNETFLT_LINUX_NO_XMIT_QUEUE
+            struct sk_buff_head   XmitQueue;
+            struct work_struct    XmitTask;
+#  endif
+            /** @} */
+# elif defined(RT_OS_SOLARIS)
+            /** @name Solaris instance data.
+             * @{ */
+#  ifdef VBOX_WITH_NETFLT_CROSSBOW
+            /** Whether the underlying interface is a VNIC or not. */
+            bool fIsVNIC;
+            /** Whether the underlying interface is a VNIC template or not. */
+            bool fIsVNICTemplate;
+            /** Handle to list of created VNICs. */
+            list_t hVNICs;
+            /** The MAC address of the host interface. */
+            RTMAC MacAddr;
+            /** Handle of this interface (lower MAC). */
+            mac_handle_t hInterface;
+            /** Handle to link state notifier. */
+            mac_notify_handle_t hNotify;
+#  else
+            /** Pointer to the bound IPv4 stream. */
+            struct vboxnetflt_stream_t * volatile pIp4Stream;
+            /** Pointer to the bound IPv6 stream. */
+            struct vboxnetflt_stream_t * volatile pIp6Stream;
+            /** Pointer to the bound ARP stream. */
+            struct vboxnetflt_stream_t * volatile pArpStream;
+            /** Pointer to the unbound promiscuous stream. */
+            struct vboxnetflt_promisc_stream_t * volatile pPromiscStream;
+            /** Whether we are attaching to IPv6 stream dynamically now. */
+            bool volatile fAttaching;
+            /** Whether this is a VLAN interface or not. */
+            bool volatile fVLAN;
+            /** Layered device handle to the interface. */
+            ldi_handle_t hIface;
+            /** The MAC address of the interface. */
+            RTMAC MacAddr;
+            /** Mutex protection used for loopback. */
+            kmutex_t hMtx;
+            /** Mutex protection used for dynamic IPv6 attaches. */
+            RTSEMFASTMUTEX hPollMtx;
+#  endif
+            /** @} */
+# elif defined(RT_OS_FREEBSD)
+            /** @name FreeBSD instance data.
+             * @{ */
+            /** Interface handle */
+            struct ifnet *ifp;
+            /** Netgraph node handle */
+            node_p node;
+            /** Input hook */
+            hook_p input;
+            /** Output hook */
+            hook_p output;
+            /** Original interface flags */
+            unsigned int flags;
+            /** Input queue */
+            struct ifqueue inq;
+            /** Output queue */
+            struct ifqueue outq;
+            /** Input task */
+            struct task tskin;
+            /** Output task */
+            struct task tskout;
+            /** The MAC address of the interface. */
+            RTMAC MacAddr;
+            /** @} */
+# elif defined(RT_OS_WINDOWS)
+            /** @name Windows instance data.
+             * @{ */
+            /** Filter driver device context. */
+            VBOXNETFLTWIN WinIf;
+
+            volatile uint32_t cModeNetFltRefs;
+            volatile uint32_t cModePassThruRefs;
+#ifndef VBOXNETFLT_NO_PACKET_QUEUE
+            /** Packet worker thread info */
+            PACKET_QUEUE_WORKER PacketQueueWorker;
+#endif
+            /** The MAC address of the interface. Caching MAC for performance reasons. */
+            RTMAC MacAddr;
+            /** mutex used to synchronize WinIf init/deinit */
+            RTSEMMUTEX hWinIfMutex;
+            /** @}  */
+# else
+#  error "PORTME"
+# endif
+        } s;
+#endif
+        /** Padding. */
+#if defined(RT_OS_WINDOWS)
+# if defined(VBOX_NETFLT_ONDEMAND_BIND)
+        uint8_t abPadding[192];
+# elif defined(VBOXNETADP)
+        uint8_t abPadding[256];
+# else
+        uint8_t abPadding[1024];
+# endif
+#elif defined(RT_OS_LINUX)
+        uint8_t abPadding[320];
+#elif defined(RT_OS_FREEBSD)
+        uint8_t abPadding[320];
+#else
+        uint8_t abPadding[128];
+#endif
+    } u;
+
+    /** The interface name. */
+    char szName[1];
+} VBOXNETFLTINS;
+/** Pointer to the instance data of a host network filter driver. */
+typedef struct VBOXNETFLTINS *PVBOXNETFLTINS;
+
+AssertCompileMemberAlignment(VBOXNETFLTINS, NanoTSLastRediscovery, 8);
+#ifdef VBOXNETFLT_OS_SPECFIC
+AssertCompile(RT_SIZEOFMEMB(VBOXNETFLTINS, u.s) <= RT_SIZEOFMEMB(VBOXNETFLTINS, u.abPadding));
+#endif
+
+
+/**
+ * The global data of the VBox filter driver.
+ *
+ * This contains the bit required for communicating with support driver, VBoxDrv
+ * (start out as SupDrv).
+ */
+typedef struct VBOXNETFLTGLOBALS
+{
+    /** Mutex protecting the list of instances and state changes. */
+    RTSEMFASTMUTEX hFastMtx;
+    /** Pointer to a list of instance data. */
+    PVBOXNETFLTINS pInstanceHead;
+
+    /** The INTNET trunk network interface factory. */
+    INTNETTRUNKFACTORY TrunkFactory;
+    /** The SUPDRV component factory registration. */
+    SUPDRVFACTORY SupDrvFactory;
+    /** The number of current factory references. */
+    int32_t volatile cFactoryRefs;
+    /** Whether the IDC connection is open or not.
+     * This is only for cleaning up correctly after the separate IDC init on Windows. */
+    bool fIDCOpen;
+    /** The SUPDRV IDC handle (opaque struct). */
+    SUPDRVIDCHANDLE SupDrvIDC;
+} VBOXNETFLTGLOBALS;
+
+
+DECLHIDDEN(int) vboxNetFltInitGlobalsAndIdc(PVBOXNETFLTGLOBALS pGlobals);
+DECLHIDDEN(int) vboxNetFltInitGlobals(PVBOXNETFLTGLOBALS pGlobals);
+DECLHIDDEN(int) vboxNetFltInitIdc(PVBOXNETFLTGLOBALS pGlobals);
+DECLHIDDEN(int) vboxNetFltTryDeleteIdcAndGlobals(PVBOXNETFLTGLOBALS pGlobals);
+DECLHIDDEN(void) vboxNetFltDeleteGlobals(PVBOXNETFLTGLOBALS pGlobals);
+DECLHIDDEN(int) vboxNetFltTryDeleteIdc(PVBOXNETFLTGLOBALS pGlobals);
+
+DECLHIDDEN(bool) vboxNetFltCanUnload(PVBOXNETFLTGLOBALS pGlobals);
+DECLHIDDEN(PVBOXNETFLTINS) vboxNetFltFindInstance(PVBOXNETFLTGLOBALS pGlobals, const char *pszName);
+
+DECLHIDDEN(DECLCALLBACK(void)) vboxNetFltPortReleaseBusy(PINTNETTRUNKIFPORT pIfPort);
+DECLHIDDEN(void) vboxNetFltRetain(PVBOXNETFLTINS pThis, bool fBusy);
+DECLHIDDEN(bool) vboxNetFltTryRetainBusyActive(PVBOXNETFLTINS pThis);
+DECLHIDDEN(bool) vboxNetFltTryRetainBusyNotDisconnected(PVBOXNETFLTINS pThis);
+DECLHIDDEN(void) vboxNetFltRelease(PVBOXNETFLTINS pThis, bool fBusy);
+
+#ifdef VBOXNETFLT_STATIC_CONFIG
+DECLHIDDEN(int) vboxNetFltSearchCreateInstance(PVBOXNETFLTGLOBALS pGlobals, const char *pszName, PVBOXNETFLTINS *ppInstance, void * pContext);
+#endif
+
+
+
+/** @name The OS specific interface.
+ * @{ */
+/**
+ * Try rediscover the host interface.
+ *
+ * This is called periodically from the transmit path if we're marked as
+ * disconnected from the host. There is no chance of a race here.
+ *
+ * @returns true if the interface was successfully rediscovered and reattach,
+ *          otherwise false.
+ * @param   pThis           The new instance.
+ */
+DECLHIDDEN(bool) vboxNetFltOsMaybeRediscovered(PVBOXNETFLTINS pThis);
+
+/**
+ * Transmits a frame.
+ *
+ * @return  IPRT status code.
+ * @param   pThis           The new instance.
+ * @param   pvIfData        Pointer to the host-private interface data.
+ * @param   pSG             The (scatter/)gather list.
+ * @param   fDst            The destination mask. At least one bit will be set.
+ *
+ * @remarks Owns the out-bound trunk port semaphore.
+ */
+DECLHIDDEN(int) vboxNetFltPortOsXmit(PVBOXNETFLTINS pThis, void *pvIfData, PINTNETSG pSG, uint32_t fDst);
+
+/**
+ * This is called when activating or suspending the instance.
+ *
+ * Use this method to enable and disable promiscuous mode on
+ * the interface to prevent unnecessary interrupt load.
+ *
+ * It is only called when the state changes.
+ *
+ * @param   pThis           The instance.
+ * @param   fActive         Whether to active (@c true) or deactive.
+ *
+ * @remarks Owns the lock for the out-bound trunk port.
+ */
+DECLHIDDEN(void) vboxNetFltPortOsSetActive(PVBOXNETFLTINS pThis, bool fActive);
+
+/**
+ * This is called when a network interface has obtained a new MAC address.
+ *
+ * @param   pThis           The instance.
+ * @param   pvIfData        Pointer to the private interface data.
+ * @param   pMac            Pointer to the new MAC address.
+ */
+DECLHIDDEN(void) vboxNetFltPortOsNotifyMacAddress(PVBOXNETFLTINS pThis, void *pvIfData, PCRTMAC pMac);
+
+/**
+ * This is called when an interface is connected to the network.
+ *
+ * @return IPRT status code.
+ * @param   pThis           The instance.
+ * @param   pvIf            Pointer to the interface.
+ * @param   ppvIfData       Where to store the private interface data.
+ */
+DECLHIDDEN(int) vboxNetFltPortOsConnectInterface(PVBOXNETFLTINS pThis, void *pvIf, void **ppvIfData);
+
+/**
+ * This is called when a VM host disconnects from the network.
+ *
+ * @param   pThis           The instance.
+ * @param   pvIfData        Pointer to the private interface data.
+ */
+DECLHIDDEN(int) vboxNetFltPortOsDisconnectInterface(PVBOXNETFLTINS pThis, void *pvIfData);
+
+/**
+ * This is called to when disconnecting from a network.
+ *
+ * @return  IPRT status code.
+ * @param   pThis           The new instance.
+ *
+ * @remarks May own the semaphores for the global list, the network lock and the out-bound trunk port.
+ */
+DECLHIDDEN(int) vboxNetFltOsDisconnectIt(PVBOXNETFLTINS pThis);
+
+/**
+ * This is called to when connecting to a network.
+ *
+ * @return  IPRT status code.
+ * @param   pThis           The new instance.
+ *
+ * @remarks Owns the semaphores for the global list, the network lock and the out-bound trunk port.
+ */
+DECLHIDDEN(int) vboxNetFltOsConnectIt(PVBOXNETFLTINS pThis);
+
+/**
+ * Counter part to vboxNetFltOsInitInstance().
+ *
+ * @return  IPRT status code.
+ * @param   pThis           The new instance.
+ *
+ * @remarks May own the semaphores for the global list, the network lock and the out-bound trunk port.
+ */
+DECLHIDDEN(void) vboxNetFltOsDeleteInstance(PVBOXNETFLTINS pThis);
+
+/**
+ * This is called to attach to the actual host interface
+ * after linking the instance into the list.
+ *
+ * The MAC address as well promiscuousness and GSO capabilities should be
+ * reported by this function.
+ *
+ * @return  IPRT status code.
+ * @param   pThis           The new instance.
+ * @param   pvContext       The user supplied context in the static config only.
+ *                          NULL in the dynamic config.
+ *
+ * @remarks Owns no locks.
+ */
+DECLHIDDEN(int) vboxNetFltOsInitInstance(PVBOXNETFLTINS pThis, void *pvContext);
+
+/**
+ * This is called to perform structure initializations.
+ *
+ * @return  IPRT status code.
+ * @param   pThis           The new instance.
+ *
+ * @remarks Owns no locks.
+ */
+DECLHIDDEN(int) vboxNetFltOsPreInitInstance(PVBOXNETFLTINS pThis);
+/** @} */
+
+
+RT_C_DECLS_END
+
+#endif /* !VBOX_INCLUDED_SRC_VBoxNetFlt_VBoxNetFltInternal_h */
+
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/darwin/Info.plist b/src/VBox/HostDrivers/VBoxNetFlt/darwin/Info.plist
new file mode 100644
index 00000000..20338308
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/darwin/Info.plist
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>CFBundleDevelopmentRegion</key>        <string>English</string>
+    <key>CFBundleExecutable</key>               <string>VBoxNetFlt</string>
+    <key>CFBundleIdentifier</key>               <string>org.virtualbox.kext.VBoxNetFlt</string>
+    <key>CFBundleInfoDictionaryVersion</key>    <string>6.0</string>
+    <key>CFBundleName</key>                     <string>VBoxNetFlt</string>
+    <key>CFBundlePackageType</key>              <string>KEXT</string>
+    <key>CFBundleSignature</key>                <string>????</string>
+    <key>CFBundleGetInfoString</key>            <string>@VBOX_PRODUCT@ @VBOX_VERSION_STRING@, © 2007-@VBOX_C_YEAR@ @VBOX_VENDOR@</string>
+    <key>CFBundleVersion</key>                  <string>@VBOX_VERSION_MAJOR@.@VBOX_VERSION_MINOR@.@VBOX_VERSION_BUILD@</string>
+    <key>CFBundleShortVersionString</key>       <string>@VBOX_VERSION_MAJOR@.@VBOX_VERSION_MINOR@.@VBOX_VERSION_BUILD@</string>
+    <key>IOKitPersonalities</key>
+    <dict>
+    </dict>
+    <key>OSBundleLibraries</key>
+    <dict>
+        <key>com.apple.kpi.bsd</key>            <string>8.8.1</string>
+        <key>com.apple.kpi.mach</key>           <string>8.8.1</string>
+        <key>com.apple.kpi.libkern</key>        <string>8.8.1</string>
+        <key>com.apple.kpi.unsupported</key>    <string>8.8.1</string>
+        <key>com.apple.kpi.iokit</key>          <string>8.8.1</string>
+        <key>org.virtualbox.kext.VBoxDrv</key>  <string>@VBOX_VERSION_MAJOR@.@VBOX_VERSION_MINOR@.@VBOX_VERSION_BUILD@</string>
+    </dict>
+    <key>OSBundleLibraries_x86_64</key>
+    <dict>
+        <key>com.apple.kpi.bsd</key>            <string>10.0.0d3</string>
+        <key>com.apple.kpi.mach</key>           <string>10.0.0d3</string>
+        <key>com.apple.kpi.libkern</key>        <string>10.0.0d3</string>
+        <key>com.apple.kpi.unsupported</key>    <string>10.0.0d3</string>
+        <key>com.apple.kpi.iokit</key>          <string>10.0.0d3</string>
+        <key>org.virtualbox.kext.VBoxDrv</key>  <string>@VBOX_VERSION_MAJOR@.@VBOX_VERSION_MINOR@.@VBOX_VERSION_BUILD@</string>
+    </dict>
+</dict>
+</plist>
+
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/darwin/Makefile.kup b/src/VBox/HostDrivers/VBoxNetFlt/darwin/Makefile.kup
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/darwin/Makefile.kup
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/darwin/VBoxNetFlt-darwin.cpp b/src/VBox/HostDrivers/VBoxNetFlt/darwin/VBoxNetFlt-darwin.cpp
new file mode 100644
index 00000000..767a34e0
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/darwin/VBoxNetFlt-darwin.cpp
@@ -0,0 +1,1717 @@
+/* $Id: VBoxNetFlt-darwin.cpp $ */
+/** @file
+ * VBoxNetFlt - Network Filter Driver (Host), Darwin Specific Code.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP LOG_GROUP_NET_FLT_DRV
+#include "../../../Runtime/r0drv/darwin/the-darwin-kernel.h"
+
+#include <VBox/log.h>
+#include <VBox/err.h>
+#include <VBox/intnetinline.h>
+#include <VBox/version.h>
+#include <iprt/initterm.h>
+#include <iprt/assert.h>
+#include <iprt/spinlock.h>
+#include <iprt/semaphore.h>
+#include <iprt/process.h>
+#include <iprt/alloc.h>
+#include <iprt/alloca.h>
+#include <iprt/time.h>
+#include <iprt/net.h>
+#include <iprt/thread.h>
+
+#include "../../darwin/VBoxNetSend.h"
+
+#include <mach/kmod.h>
+#include <sys/conf.h>
+#include <sys/errno.h>
+#include <sys/ioccom.h>
+#include <sys/filio.h>
+#include <sys/malloc.h>
+#include <sys/proc.h>
+#include <sys/socket.h>
+#include <sys/sockio.h>
+#include <sys/kern_event.h>
+#include <net/kpi_interface.h>
+RT_C_DECLS_BEGIN /* Buggy 10.4 headers, fixed in 10.5. */
+#include <sys/kpi_mbuf.h>
+#include <net/kpi_interfacefilter.h>
+RT_C_DECLS_END
+
+#include <sys/kpi_socket.h>
+#include <net/if.h>
+#include <net/if_var.h>
+RT_C_DECLS_BEGIN
+#include <net/bpf.h>
+RT_C_DECLS_END
+#include <netinet/in.h>
+#include <netinet/in_var.h>
+#include <netinet6/in6_var.h>
+
+#define VBOXNETFLT_OS_SPECFIC 1
+#include "../VBoxNetFltInternal.h"
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+/** The maximum number of SG segments.
+ * Used to prevent stack overflow and similar bad stuff. */
+#define VBOXNETFLT_DARWIN_MAX_SEGS      32
+
+#if 0
+/** For testing extremely segmented frames. */
+#define VBOXNETFLT_DARWIN_TEST_SEG_SIZE 14
+#endif
+
+/* XXX: hidden undef #ifdef __APPLE__ */
+#define VBOX_IN_LOOPBACK(addr)  (((addr) & IN_CLASSA_NET) == 0x7f000000)
+#define VBOX_IN_LINKLOCAL(addr) (((addr) & IN_CLASSB_NET) == 0xa9fe0000)
+
+
+
+/*********************************************************************************************************************************
+*   Internal Functions                                                                                                           *
+*********************************************************************************************************************************/
+RT_C_DECLS_BEGIN
+static kern_return_t    VBoxNetFltDarwinStart(struct kmod_info *pKModInfo, void *pvData);
+static kern_return_t    VBoxNetFltDarwinStop(struct kmod_info *pKModInfo, void *pvData);
+
+static void vboxNetFltDarwinSysSockUpcall(socket_t pSysSock, void *pvData, int fWait);
+RT_C_DECLS_END
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/**
+ * The mbuf tag data.
+ *
+ * We have to associate the ethernet header with each packet we're sending
+ * because things like icmp will inherit the tag it self so the tag along
+ * isn't sufficient to identify our mbufs. For the icmp scenario the ethernet
+ * header naturally changes before the packet is send pack, so let check it.
+ */
+typedef struct VBOXNETFLTTAG
+{
+    /** The ethernet header of the outgoing frame. */
+    RTNETETHERHDR EthHdr;
+} VBOXNETFLTTAG;
+/** Pointer to a VBoxNetFlt mbuf tag. */
+typedef VBOXNETFLTTAG *PVBOXNETFLTTAG;
+/** Pointer to a const VBoxNetFlt mbuf tag. */
+typedef VBOXNETFLTTAG const *PCVBOXNETFLTTAG;
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+/**
+ * Declare the module stuff.
+ */
+RT_C_DECLS_BEGIN
+extern kern_return_t _start(struct kmod_info *pKModInfo, void *pvData);
+extern kern_return_t _stop(struct kmod_info *pKModInfo, void *pvData);
+
+KMOD_EXPLICIT_DECL(VBoxNetFlt, VBOX_VERSION_STRING, _start, _stop)
+DECLHIDDEN(kmod_start_func_t *) _realmain = VBoxNetFltDarwinStart;
+DECLHIDDEN(kmod_stop_func_t  *) _antimain = VBoxNetFltDarwinStop;
+DECLHIDDEN(int)                 _kext_apple_cc = __APPLE_CC__;
+RT_C_DECLS_END
+
+
+/**
+ * The (common) global data.
+ */
+static VBOXNETFLTGLOBALS g_VBoxNetFltGlobals;
+
+/** The unique tag id for this module.
+ * This is basically a unique string hash that lives on until reboot.
+ * It is used for tagging mbufs. */
+static mbuf_tag_id_t g_idTag;
+
+/** The offset of the struct ifnet::if_pcount variable.
+ * @remarks Initial value is valid for Lion and earlier. We adjust it on attach
+ *          for later releases.  */
+static unsigned g_offIfNetPCount = sizeof(void *) * (1 /*if_softc*/ + 1 /*if_name*/ + 2 /*if_link*/ + 2 /*if_addrhead*/ + 1 /*if_check_multi*/)
+                                 + sizeof(u_long) /*if_refcnt*/;
+/** Macro for accessing ifnet::if_pcount. */
+#define VBOX_GET_PCOUNT(pIfNet) ( *(int *)((uintptr_t)pIfNet + g_offIfNetPCount) )
+/** The size of area of ifnet structure we try to locate if_pcount in. */
+#define VBOXNETFLT_DARWIN_IFNET_SIZE 256
+/** Indicates whether g_offIfNetPCount has been adjusted already (no point in
+ * doing it more than once). */
+static bool g_fNetPCountFound  = false;
+
+
+/**
+ * Change the promiscuous setting and try spot the changed in @a pIfNet.
+ *
+ * @returns Offset of potential p_count field.
+ * @param   pIfNet      The interface we're attaching to.
+ * @param   iPromisc    Whether to enable (1) or disable (0) promiscuous mode.
+ *
+ * @note    This implementation relies on if_pcount to be aligned on sizeof(int).
+ */
+static unsigned vboxNetFltDarwinSetAndDiff(ifnet_t pIfNet, int iPromisc)
+{
+    int aiSavedState[VBOXNETFLT_DARWIN_IFNET_SIZE / sizeof(int)];
+    memcpy(aiSavedState, pIfNet, sizeof(aiSavedState));
+
+    ifnet_set_promiscuous(pIfNet, iPromisc);
+
+    int const iDiff = iPromisc ? 1 : -1;
+
+    /*
+     * We assume that ifnet structure will never have less members in front of if_pcount
+     * than it used to have in Lion. If this turns out to be false assumption we will
+     * have to start from zero offset.
+     */
+    for (unsigned i = g_offIfNetPCount / sizeof(int); i < RT_ELEMENTS(aiSavedState); i++)
+        if (((int*)pIfNet)[i] - aiSavedState[i] == iDiff)
+            return i * sizeof(int);
+
+    return 0;
+}
+
+
+/**
+ * Detect and adjust the offset of ifnet::if_pcount.
+ *
+ * @param   pIfNet      The interface we're attaching to.
+ */
+static void vboxNetFltDarwinDetectPCountOffset(ifnet_t pIfNet)
+{
+    if (g_fNetPCountFound)
+        return;
+
+    /*
+     * It would be nice to use locking at this point, but it is not available via KPI.
+     * This is why we try several times. At each attempt we modify if_pcount four times
+     * to rule out false detections.
+     */
+    unsigned offTry1, offTry2, offTry3, offTry4;
+    for (int iAttempt = 0; iAttempt < 3; iAttempt++)
+    {
+        offTry1 = vboxNetFltDarwinSetAndDiff(pIfNet, 1);
+        offTry2 = vboxNetFltDarwinSetAndDiff(pIfNet, 1);
+        offTry3 = vboxNetFltDarwinSetAndDiff(pIfNet, 0);
+        offTry4 = vboxNetFltDarwinSetAndDiff(pIfNet, 0);
+        if (offTry1 == offTry2 && offTry2 == offTry3 && offTry3 == offTry4)
+        {
+            if (g_offIfNetPCount != offTry1)
+            {
+                Log(("VBoxNetFltDarwinDetectPCountOffset: Adjusted if_pcount offset to %x from %x.\n", offTry1, g_offIfNetPCount));
+                g_offIfNetPCount = offTry1;
+                g_fNetPCountFound = true;
+            }
+            break;
+        }
+    }
+
+    if (g_offIfNetPCount != offTry1)
+        LogRel(("VBoxNetFlt: Failed to detect promiscuous count, all traffic may reach wire (%x != %x).\n", g_offIfNetPCount, offTry1));
+}
+
+
+/**
+ * Start the kernel module.
+ */
+static kern_return_t    VBoxNetFltDarwinStart(struct kmod_info *pKModInfo, void *pvData)
+{
+    RT_NOREF(pKModInfo, pvData);
+
+    /*
+     * Initialize IPRT and find our module tag id.
+     * (IPRT is shared with VBoxDrv, it creates the loggers.)
+     */
+    int rc = RTR0Init(0);
+    if (RT_SUCCESS(rc))
+    {
+        Log(("VBoxNetFltDarwinStart\n"));
+        errno_t err = mbuf_tag_id_find("org.VirtualBox.kext.VBoxFltDrv", &g_idTag);
+        if (!err)
+        {
+            /*
+             * Initialize the globals and connect to the support driver.
+             *
+             * This will call back vboxNetFltOsOpenSupDrv (and maybe vboxNetFltOsCloseSupDrv)
+             * for establishing the connect to the support driver.
+             */
+            memset(&g_VBoxNetFltGlobals, 0, sizeof(g_VBoxNetFltGlobals));
+            rc = vboxNetFltInitGlobalsAndIdc(&g_VBoxNetFltGlobals);
+            if (RT_SUCCESS(rc))
+            {
+                LogRel(("VBoxFltDrv: version " VBOX_VERSION_STRING " r%d\n", VBOX_SVN_REV));
+                return KMOD_RETURN_SUCCESS;
+            }
+
+            LogRel(("VBoxFltDrv: failed to initialize device extension (rc=%d)\n", rc));
+        }
+        else
+            LogRel(("VBoxFltDrv: mbuf_tag_id_find failed, err=%d\n", err));
+        RTR0Term();
+    }
+    else
+        printf("VBoxFltDrv: failed to initialize IPRT (rc=%d)\n", rc);
+
+    memset(&g_VBoxNetFltGlobals, 0, sizeof(g_VBoxNetFltGlobals));
+    return KMOD_RETURN_FAILURE;
+}
+
+
+/**
+ * Stop the kernel module.
+ */
+static kern_return_t VBoxNetFltDarwinStop(struct kmod_info *pKModInfo, void *pvData)
+{
+    RT_NOREF(pKModInfo, pvData);
+    Log(("VBoxNetFltDarwinStop\n"));
+
+    /*
+     * Refuse to unload if anyone is currently using the filter driver.
+     * This is important as I/O kit / xnu will to be able to do usage
+     * tracking for us!
+     */
+    int rc = vboxNetFltTryDeleteIdcAndGlobals(&g_VBoxNetFltGlobals);
+    if (RT_FAILURE(rc))
+    {
+        Log(("VBoxNetFltDarwinStop - failed, busy.\n"));
+        return KMOD_RETURN_FAILURE;
+    }
+
+    /*
+     * Undo the work done during start (in reverse order).
+     */
+    memset(&g_VBoxNetFltGlobals, 0, sizeof(g_VBoxNetFltGlobals));
+
+    RTR0Term();
+
+    return KMOD_RETURN_SUCCESS;
+}
+
+
+/**
+ * Reads and retains the host interface handle.
+ *
+ * @returns The handle, NULL if detached.
+ * @param   pThis
+ */
+DECLINLINE(ifnet_t) vboxNetFltDarwinRetainIfNet(PVBOXNETFLTINS pThis)
+{
+    ifnet_t pIfNet = NULL;
+
+    /*
+     * Be careful here to avoid problems racing the detached callback.
+     */
+    RTSpinlockAcquire(pThis->hSpinlock);
+    if (!ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost))
+    {
+        pIfNet = ASMAtomicUoReadPtrT(&pThis->u.s.pIfNet, ifnet_t);
+        if (pIfNet)
+            ifnet_reference(pIfNet);
+    }
+    RTSpinlockRelease(pThis->hSpinlock);
+
+    return pIfNet;
+}
+
+
+/**
+ * Release the host interface handle previously retained
+ * by vboxNetFltDarwinRetainIfNet.
+ *
+ * @param   pThis           The instance.
+ * @param   pIfNet          The vboxNetFltDarwinRetainIfNet return value, NULL is fine.
+ */
+DECLINLINE(void) vboxNetFltDarwinReleaseIfNet(PVBOXNETFLTINS pThis, ifnet_t pIfNet)
+{
+    NOREF(pThis);
+    if (pIfNet)
+        ifnet_release(pIfNet);
+}
+
+
+/**
+ * Checks whether this is an mbuf created by vboxNetFltDarwinMBufFromSG,
+ * i.e. a buffer which we're pushing and should be ignored by the filter callbacks.
+ *
+ * @returns true / false accordingly.
+ * @param   pThis           The instance.
+ * @param   pMBuf           The mbuf.
+ * @param   pvFrame         The frame pointer, optional.
+ */
+DECLINLINE(bool) vboxNetFltDarwinMBufIsOur(PVBOXNETFLTINS pThis, mbuf_t pMBuf, void *pvFrame)
+{
+    NOREF(pThis);
+
+    /*
+     * Lookup the tag set by vboxNetFltDarwinMBufFromSG.
+     */
+    PCVBOXNETFLTTAG pTagData;
+    size_t cbTagData;
+    errno_t err = mbuf_tag_find(pMBuf, g_idTag, 0 /* type */, &cbTagData, (void **)&pTagData);
+    if (err)
+        return false;
+    AssertReturn(cbTagData == sizeof(*pTagData), false);
+
+    /*
+     * Dig out the ethernet header from the mbuf.
+     */
+    PCRTNETETHERHDR pEthHdr = (PCRTNETETHERHDR)pvFrame;
+    if (!pEthHdr)
+        pEthHdr = (PCRTNETETHERHDR)mbuf_pkthdr_header(pMBuf);
+    if (!pEthHdr)
+        pEthHdr = (PCRTNETETHERHDR)mbuf_data(pMBuf);
+    /* ASSUMING that there is enough data to work on! */
+    if (    pEthHdr->DstMac.au8[0] != pTagData->EthHdr.DstMac.au8[0]
+        ||  pEthHdr->DstMac.au8[1] != pTagData->EthHdr.DstMac.au8[1]
+        ||  pEthHdr->DstMac.au8[2] != pTagData->EthHdr.DstMac.au8[2]
+        ||  pEthHdr->DstMac.au8[3] != pTagData->EthHdr.DstMac.au8[3]
+        ||  pEthHdr->DstMac.au8[4] != pTagData->EthHdr.DstMac.au8[4]
+        ||  pEthHdr->DstMac.au8[5] != pTagData->EthHdr.DstMac.au8[5]
+        ||  pEthHdr->SrcMac.au8[0] != pTagData->EthHdr.SrcMac.au8[0]
+        ||  pEthHdr->SrcMac.au8[1] != pTagData->EthHdr.SrcMac.au8[1]
+        ||  pEthHdr->SrcMac.au8[2] != pTagData->EthHdr.SrcMac.au8[2]
+        ||  pEthHdr->SrcMac.au8[3] != pTagData->EthHdr.SrcMac.au8[3]
+        ||  pEthHdr->SrcMac.au8[4] != pTagData->EthHdr.SrcMac.au8[4]
+        ||  pEthHdr->SrcMac.au8[5] != pTagData->EthHdr.SrcMac.au8[5]
+        ||  pEthHdr->EtherType     != pTagData->EthHdr.EtherType)
+    {
+        Log3(("tagged, but the ethernet header has changed\n"));
+        return false;
+    }
+
+    return true;
+}
+
+
+/**
+ * Internal worker that create a darwin mbuf for a (scatter/)gather list.
+ *
+ * @returns Pointer to the mbuf.
+ * @param   pThis           The instance.
+ * @param   pSG             The (scatter/)gather list.
+ */
+static mbuf_t vboxNetFltDarwinMBufFromSG(PVBOXNETFLTINS pThis, PINTNETSG pSG)
+{
+    /// @todo future? mbuf_how_t How = preemption enabled ? MBUF_DONTWAIT : MBUF_WAITOK;
+    mbuf_how_t How = MBUF_WAITOK;
+
+    /*
+     * We need some way of getting back to our instance data when
+     * the mbuf is freed, so use pvUserData for this.
+     *  -- this is not relevant anylonger! --
+     */
+    Assert(!pSG->pvUserData || pSG->pvUserData == pThis);
+    Assert(!pSG->pvUserData2);
+    pSG->pvUserData = pThis;
+
+    /*
+     * Allocate a packet and copy over the data.
+     *
+     * Using mbuf_attachcluster() here would've been nice but there are two
+     * issues with it: (1) it's 10.5.x only, and (2) the documentation indicates
+     * that it's not supposed to be used for really external buffers. The 2nd
+     * point might be argued against considering that the only m_clattach user
+     * is mallocs memory for the ext mbuf and not doing what's stated in the docs.
+     * However, it's hard to tell if these m_clattach buffers actually makes it
+     * to the NICs or not, and even if they did, the NIC would need the physical
+     * addresses for the pages they contain and might end up copying the data
+     * to a new mbuf anyway.
+     *
+     * So, in the end it's better to just do it the simple way that will work
+     * 100%, even if it involves some extra work (alloc + copy) we really wished
+     * to avoid.
+     *
+     * Note. We can't make use of the physical addresses on darwin because the
+     *       way the mbuf / cluster stuff works (see mbuf_data_to_physical and
+     *       mcl_to_paddr).
+     */
+    mbuf_t pPkt = NULL;
+    errno_t err = mbuf_allocpacket(How, pSG->cbTotal, NULL, &pPkt);
+    if (!err)
+    {
+        /* Skip zero sized memory buffers (paranoia). */
+        mbuf_t pCur = pPkt;
+        while (pCur && !mbuf_maxlen(pCur))
+            pCur = mbuf_next(pCur);
+        Assert(pCur);
+
+        /* Set the required packet header attributes. */
+        mbuf_pkthdr_setlen(pPkt, pSG->cbTotal);
+        mbuf_pkthdr_setheader(pPkt, mbuf_data(pCur));
+
+        /* Special case the single buffer copy. */
+        if (    mbuf_next(pCur)
+            &&  mbuf_maxlen(pCur) >= pSG->cbTotal)
+        {
+            mbuf_setlen(pCur, pSG->cbTotal);
+            IntNetSgRead(pSG, mbuf_data(pCur));
+        }
+        else
+        {
+            /* Multi buffer copying. */
+            size_t  cbLeft = pSG->cbTotal;
+            size_t  offSrc = 0;
+            while (cbLeft > 0 && pCur)
+            {
+                size_t cb = mbuf_maxlen(pCur);
+                if (cb > cbLeft)
+                    cb = cbLeft;
+                mbuf_setlen(pCur, cb);
+                IntNetSgReadEx(pSG, offSrc, cb, mbuf_data(pCur));
+
+                /* advance */
+                offSrc += cb;
+                cbLeft -= cb;
+                pCur = mbuf_next(pCur);
+            }
+            Assert(cbLeft == 0);
+        }
+        if (!err)
+        {
+            /*
+             * Tag the packet and return successfully.
+             */
+            PVBOXNETFLTTAG pTagData;
+            err = mbuf_tag_allocate(pPkt, g_idTag, 0 /* type */, sizeof(VBOXNETFLTTAG) /* tag len */, How, (void **)&pTagData);
+            if (!err)
+            {
+                Assert(pSG->aSegs[0].cb >= sizeof(pTagData->EthHdr));
+                memcpy(&pTagData->EthHdr, pSG->aSegs[0].pv, sizeof(pTagData->EthHdr));
+                return pPkt;
+            }
+
+            /* bailout: */
+            AssertMsg(err == ENOMEM || err == EWOULDBLOCK, ("err=%d\n", err));
+        }
+
+        mbuf_freem(pPkt);
+    }
+    else
+        AssertMsg(err == ENOMEM || err == EWOULDBLOCK, ("err=%d\n", err));
+    pSG->pvUserData = NULL;
+
+    return NULL;
+}
+
+
+/**
+ * Calculates the number of segments required to represent the mbuf.
+ *
+ * @returns Number of segments.
+ * @param   pThis               The instance.
+ * @param   pMBuf               The mbuf.
+ * @param   pvFrame             The frame pointer, optional.
+ */
+DECLINLINE(unsigned) vboxNetFltDarwinMBufCalcSGSegs(PVBOXNETFLTINS pThis, mbuf_t pMBuf, void *pvFrame)
+{
+    NOREF(pThis);
+
+    /*
+     * Count the buffers in the chain.
+     */
+    unsigned cSegs = 0;
+    for (mbuf_t pCur = pMBuf; pCur; pCur = mbuf_next(pCur))
+        if (mbuf_len(pCur))
+            cSegs++;
+        else if (   !cSegs
+                 && pvFrame
+                 && (uintptr_t)pvFrame - (uintptr_t)mbuf_datastart(pMBuf) < mbuf_maxlen(pMBuf))
+            cSegs++;
+
+#ifdef PADD_RUNT_FRAMES_FROM_HOST
+    /*
+     * Add one buffer if the total is less than the ethernet minimum 60 bytes.
+     * This may allocate a segment too much if the ethernet header is separated,
+     * but that shouldn't harm us much.
+     */
+    if (mbuf_pkthdr_len(pMBuf) < 60)
+        cSegs++;
+#endif
+
+#ifdef VBOXNETFLT_DARWIN_TEST_SEG_SIZE
+    /* maximize the number of segments. */
+    cSegs = RT_MAX(VBOXNETFLT_DARWIN_MAX_SEGS - 1, cSegs);
+#endif
+
+    return cSegs ? cSegs : 1;
+}
+
+
+/**
+ * Initializes a SG list from an mbuf.
+ *
+ * @returns Number of segments.
+ * @param   pThis               The instance.
+ * @param   pMBuf               The mbuf.
+ * @param   pSG                 The SG.
+ * @param   pvFrame             The frame pointer, optional.
+ * @param   cSegs               The number of segments allocated for the SG.
+ *                              This should match the number in the mbuf exactly!
+ * @param   fSrc                The source of the frame.
+ */
+DECLINLINE(void) vboxNetFltDarwinMBufToSG(PVBOXNETFLTINS pThis, mbuf_t pMBuf, void *pvFrame, PINTNETSG pSG, unsigned cSegs,
+                                          uint32_t fSrc)
+{
+    RT_NOREF(pThis, fSrc);
+
+    /*
+     * Walk the chain and convert the buffers to segments.  Works INTNETSG::cbTotal.
+     */
+    unsigned iSeg = 0;
+    IntNetSgInitTempSegs(pSG, 0 /*cbTotal*/, cSegs, 0 /*cSegsUsed*/);
+    for (mbuf_t pCur = pMBuf; pCur; pCur = mbuf_next(pCur))
+    {
+        size_t cbSeg = mbuf_len(pCur);
+        if (cbSeg)
+        {
+            void *pvSeg = mbuf_data(pCur);
+
+            /* deal with pvFrame */
+            if (!iSeg && pvFrame && pvFrame != pvSeg)
+            {
+                void     *pvStart   = mbuf_datastart(pMBuf);
+                uintptr_t offSeg    = (uintptr_t)pvSeg - (uintptr_t)pvStart;
+                uintptr_t offSegEnd = offSeg + cbSeg;
+                Assert(pvStart && pvSeg && offSeg < mbuf_maxlen(pMBuf) && offSegEnd <= mbuf_maxlen(pMBuf)); NOREF(offSegEnd);
+                uintptr_t offFrame  = (uintptr_t)pvFrame - (uintptr_t)pvStart;
+                if (RT_LIKELY(offFrame < offSeg))
+                {
+                    pvSeg = pvFrame;
+                    cbSeg += offSeg - offFrame;
+                }
+                else
+                    AssertMsgFailed(("pvFrame=%p pvStart=%p pvSeg=%p offSeg=%p cbSeg=%#zx offSegEnd=%p offFrame=%p maxlen=%#zx\n",
+                                     pvFrame, pvStart, pvSeg, offSeg, cbSeg, offSegEnd, offFrame, mbuf_maxlen(pMBuf)));
+                pvFrame = NULL;
+            }
+
+            AssertBreak(iSeg < cSegs);
+            pSG->cbTotal += cbSeg;
+            pSG->aSegs[iSeg].cb = cbSeg;
+            pSG->aSegs[iSeg].pv = pvSeg;
+            pSG->aSegs[iSeg].Phys = NIL_RTHCPHYS;
+            iSeg++;
+        }
+        /* The pvFrame might be in a now empty buffer. */
+        else if (   !iSeg
+                 && pvFrame
+                 && (uintptr_t)pvFrame - (uintptr_t)mbuf_datastart(pMBuf) < mbuf_maxlen(pMBuf))
+        {
+            cbSeg = (uintptr_t)mbuf_datastart(pMBuf) + mbuf_maxlen(pMBuf) - (uintptr_t)pvFrame;
+            pSG->cbTotal += cbSeg;
+            pSG->aSegs[iSeg].cb = cbSeg;
+            pSG->aSegs[iSeg].pv = pvFrame;
+            pSG->aSegs[iSeg].Phys = NIL_RTHCPHYS;
+            iSeg++;
+            pvFrame = NULL;
+        }
+    }
+
+    Assert(iSeg && iSeg <= cSegs);
+    pSG->cSegsUsed = iSeg;
+
+#ifdef PADD_RUNT_FRAMES_FROM_HOST
+    /*
+     * Add a trailer if the frame is too small.
+     *
+     * Since we're getting to the packet before it is framed, it has not
+     * yet been padded. The current solution is to add a segment pointing
+     * to a buffer containing all zeros and pray that works for all frames...
+     */
+    if (pSG->cbTotal < 60 && (fSrc == INTNETTRUNKDIR_HOST))
+    {
+        AssertReturnVoid(iSeg < cSegs);
+
+        static uint8_t const s_abZero[128] = {0};
+        pSG->aSegs[iSeg].Phys = NIL_RTHCPHYS;
+        pSG->aSegs[iSeg].pv = (void *)&s_abZero[0];
+        pSG->aSegs[iSeg].cb = 60 - pSG->cbTotal;
+        pSG->cbTotal = 60;
+        pSG->cSegsUsed++;
+    }
+#endif
+
+#ifdef VBOXNETFLT_DARWIN_TEST_SEG_SIZE
+    /*
+     * Redistribute the segments.
+     */
+    if (pSG->cSegsUsed < pSG->cSegsAlloc)
+    {
+        /* copy the segments to the end. */
+        int iSrc = pSG->cSegsUsed;
+        int iDst = pSG->cSegsAlloc;
+        while (iSrc > 0)
+        {
+            iDst--;
+            iSrc--;
+            pSG->aSegs[iDst] = pSG->aSegs[iSrc];
+        }
+
+        /* create small segments from the start. */
+        pSG->cSegsUsed = pSG->cSegsAlloc;
+        iSrc = iDst;
+        iDst = 0;
+        while (     iDst < iSrc
+               &&   iDst < pSG->cSegsAlloc)
+        {
+            pSG->aSegs[iDst].Phys = NIL_RTHCPHYS;
+            pSG->aSegs[iDst].pv = pSG->aSegs[iSrc].pv;
+            pSG->aSegs[iDst].cb = RT_MIN(pSG->aSegs[iSrc].cb, VBOXNETFLT_DARWIN_TEST_SEG_SIZE);
+            if (pSG->aSegs[iDst].cb != pSG->aSegs[iSrc].cb)
+            {
+                pSG->aSegs[iSrc].cb -= pSG->aSegs[iDst].cb;
+                pSG->aSegs[iSrc].pv = (uint8_t *)pSG->aSegs[iSrc].pv + pSG->aSegs[iDst].cb;
+            }
+            else if (++iSrc >= pSG->cSegsAlloc)
+            {
+                pSG->cSegsUsed = iDst + 1;
+                break;
+            }
+            iDst++;
+        }
+    }
+#endif
+
+    AssertMsg(!pvFrame, ("pvFrame=%p pMBuf=%p iSeg=%d\n", pvFrame, pMBuf, iSeg));
+}
+
+
+/**
+ * Helper for determining whether the host wants the interface to be
+ * promiscuous.
+ */
+static bool vboxNetFltDarwinIsPromiscuous(PVBOXNETFLTINS pThis)
+{
+    bool fRc = false;
+    ifnet_t pIfNet = vboxNetFltDarwinRetainIfNet(pThis);
+    if (pIfNet)
+    {
+        /* gather the data */
+        uint16_t fIf = ifnet_flags(pIfNet);
+        unsigned cPromisc = VBOX_GET_PCOUNT(pIfNet);
+        bool fSetPromiscuous = ASMAtomicUoReadBool(&pThis->u.s.fSetPromiscuous);
+        vboxNetFltDarwinReleaseIfNet(pThis, pIfNet);
+
+        /* calc the return. */
+        fRc = (fIf & IFF_PROMISC)
+           && cPromisc > fSetPromiscuous;
+    }
+    return fRc;
+}
+
+
+
+/**
+ *
+ * @see iff_detached_func in the darwin kpi.
+ */
+static void vboxNetFltDarwinIffDetached(void *pvThis, ifnet_t pIfNet)
+{
+    PVBOXNETFLTINS pThis = (PVBOXNETFLTINS)pvThis;
+    uint64_t NanoTS = RTTimeSystemNanoTS();
+    LogFlow(("vboxNetFltDarwinIffDetached: pThis=%p NanoTS=%RU64 (%d)\n",
+             pThis, NanoTS, VALID_PTR(pIfNet) ? VBOX_GET_PCOUNT(pIfNet) :  -1));
+
+    Assert(!pThis->fDisconnectedFromHost);
+    Assert(!pThis->fRediscoveryPending);
+
+    /*
+     * If we've put it into promiscuous mode, undo that now. If we don't
+     * the if_pcount will go all wrong when it's replugged.
+     */
+    if (ASMAtomicXchgBool(&pThis->u.s.fSetPromiscuous, false))
+        ifnet_set_promiscuous(pIfNet, 0);
+
+    /*
+     * We carefully take the spinlock and increase the interface reference
+     * behind it in order to avoid problematic races with the detached callback.
+     */
+    RTSpinlockAcquire(pThis->hSpinlock);
+
+    pIfNet = ASMAtomicUoReadPtrT(&pThis->u.s.pIfNet, ifnet_t);
+    int cPromisc = VALID_PTR(pIfNet) ? VBOX_GET_PCOUNT(pIfNet) : - 1;
+
+    ASMAtomicUoWriteNullPtr(&pThis->u.s.pIfNet);
+    ASMAtomicUoWriteNullPtr(&pThis->u.s.pIfFilter);
+    ASMAtomicWriteBool(&pThis->u.s.fNeedSetPromiscuous, false);
+    pThis->u.s.fSetPromiscuous = false;
+    ASMAtomicUoWriteU64(&pThis->NanoTSLastRediscovery, NanoTS);
+    ASMAtomicUoWriteBool(&pThis->fRediscoveryPending, false);
+    ASMAtomicWriteBool(&pThis->fDisconnectedFromHost, true);
+
+    RTSpinlockRelease(pThis->hSpinlock);
+
+    if (pIfNet)
+        ifnet_release(pIfNet);
+    LogRel(("VBoxNetFlt: was detached from '%s' (%d)\n", pThis->szName, cPromisc));
+}
+
+
+/**
+ *
+ * @see iff_ioctl_func in the darwin kpi.
+ */
+static errno_t vboxNetFltDarwinIffIoCtl(void *pvThis, ifnet_t pIfNet, protocol_family_t eProtocol, u_long uCmd, void *pvArg)
+{
+    RT_NOREF(pIfNet);
+    PVBOXNETFLTINS pThis = (PVBOXNETFLTINS)pvThis;
+    LogFlow(("vboxNetFltDarwinIffIoCtl: pThis=%p uCmd=%lx\n", pThis, uCmd));
+
+    /*
+     * Update fOtherPromiscuous.
+     */
+    /** @todo we'll have to find the offset of if_pcount to get this right! */
+    //if (uCmd == SIOCSIFFLAGS)
+    //{
+    //
+    //}
+
+    /*
+     * We didn't handle it, continue processing.
+     */
+    NOREF(pThis);
+    NOREF(eProtocol);
+    NOREF(uCmd);
+    NOREF(pvArg);
+    return EOPNOTSUPP;
+}
+
+
+/**
+ *
+ * @see iff_event_func in the darwin kpi.
+ */
+static void vboxNetFltDarwinIffEvent(void *pvThis, ifnet_t pIfNet, protocol_family_t eProtocol, const struct kev_msg *pEvMsg)
+{
+    PVBOXNETFLTINS pThis = (PVBOXNETFLTINS)pvThis;
+    LogFlow(("vboxNetFltDarwinIffEvent: pThis=%p\n", pThis));
+
+    NOREF(pThis);
+    NOREF(pIfNet);
+    NOREF(eProtocol);
+    NOREF(pEvMsg);
+
+    /*
+     * Watch out for the interface going online / offline.
+     */
+    if (    VALID_PTR(pThis)
+        &&  VALID_PTR(pEvMsg)
+        &&  pEvMsg->vendor_code  == KEV_VENDOR_APPLE
+        &&  pEvMsg->kev_class    == KEV_NETWORK_CLASS
+        &&  pEvMsg->kev_subclass == KEV_DL_SUBCLASS)
+    {
+        if (pThis->u.s.pIfNet    == pIfNet)
+        {
+            if (pEvMsg->event_code == KEV_DL_LINK_ON)
+            {
+                if (ASMAtomicUoReadBool(&pThis->u.s.fNeedSetPromiscuous))
+                {
+                    /* failed to bring it online. */
+                    errno_t err = ifnet_set_promiscuous(pIfNet, 1);
+                    if (!err)
+                    {
+                        ASMAtomicWriteBool(&pThis->u.s.fSetPromiscuous, true);
+                        ASMAtomicWriteBool(&pThis->u.s.fNeedSetPromiscuous, false);
+                        Log(("vboxNetFltDarwinIffEvent: enabled promiscuous mode on %s (%d)\n", pThis->szName, VBOX_GET_PCOUNT(pIfNet)));
+                    }
+                    else
+                        Log(("vboxNetFltDarwinIffEvent: ifnet_set_promiscuous failed on %s, err=%d (%d)\n", pThis->szName, err, VBOX_GET_PCOUNT(pIfNet)));
+                }
+                else if (   ASMAtomicUoReadBool(&pThis->u.s.fSetPromiscuous)
+                         && !(ifnet_flags(pIfNet) & IFF_PROMISC))
+                {
+                    /* Try fix the inconsistency. */
+                    errno_t err = ifnet_set_flags(pIfNet, IFF_PROMISC, IFF_PROMISC);
+                    if (!err)
+                        err = ifnet_ioctl(pIfNet, 0, SIOCSIFFLAGS, NULL);
+                    if (!err && (ifnet_flags(pIfNet) & IFF_PROMISC))
+                        Log(("vboxNetFltDarwinIffEvent: fixed IFF_PROMISC on %s (%d)\n", pThis->szName, VBOX_GET_PCOUNT(pIfNet)));
+                    else
+                        Log(("vboxNetFltDarwinIffEvent: failed to fix IFF_PROMISC on %s, err=%d flags=%#x (%d)\n",
+                             pThis->szName, err, ifnet_flags(pIfNet), VBOX_GET_PCOUNT(pIfNet)));
+                }
+                else
+                    Log(("vboxNetFltDarwinIffEvent: online, '%s'. flags=%#x (%d)\n", pThis->szName, ifnet_flags(pIfNet), VBOX_GET_PCOUNT(pIfNet)));
+            }
+            else if (pEvMsg->event_code == KEV_DL_LINK_OFF)
+                Log(("vboxNetFltDarwinIffEvent: %s goes down (%d)\n", pThis->szName, VBOX_GET_PCOUNT(pIfNet)));
+/** @todo KEV_DL_LINK_ADDRESS_CHANGED  -> pfnReportMacAddress */
+/** @todo KEV_DL_SIFFLAGS              -> pfnReportPromiscuousMode */
+        }
+        else
+            Log(("vboxNetFltDarwinIffEvent: pThis->u.s.pIfNet=%p pIfNet=%p (%d)\n", pThis->u.s.pIfNet, pIfNet, VALID_PTR(pIfNet) ? VBOX_GET_PCOUNT(pIfNet) : -1));
+    }
+    else if (VALID_PTR(pEvMsg))
+        Log(("vboxNetFltDarwinIffEvent: vendor_code=%#x kev_class=%#x kev_subclass=%#x event_code=%#x\n",
+             pEvMsg->vendor_code, pEvMsg->kev_class, pEvMsg->kev_subclass, pEvMsg->event_code));
+}
+
+
+/**
+ * Internal worker for  vboxNetFltDarwinIffInput and vboxNetFltDarwinIffOutput,
+ *
+ * @returns 0 or EJUSTRETURN.
+ * @param   pThis           The instance.
+ * @param   pMBuf           The mbuf.
+ * @param   pvFrame         The start of the frame, optional.
+ * @param   fSrc            Where the packet (allegedly) comes from, one INTNETTRUNKDIR_* value.
+ * @param   eProtocol       The protocol.
+ */
+static errno_t vboxNetFltDarwinIffInputOutputWorker(PVBOXNETFLTINS pThis, mbuf_t pMBuf, void *pvFrame,
+                                                    uint32_t fSrc, protocol_family_t eProtocol)
+{
+    /*
+     * Drop it immediately?
+     */
+    Log2(("vboxNetFltDarwinIffInputOutputWorker: pThis=%p pMBuf=%p pvFrame=%p fSrc=%#x cbPkt=%x\n",
+          pThis, pMBuf, pvFrame, fSrc, pMBuf ? mbuf_pkthdr_len(pMBuf) : -1));
+    if (!pMBuf)
+        return 0;
+#if 0 /* debugging lost icmp packets */
+    if (mbuf_pkthdr_len(pMBuf) > 0x300)
+    {
+        uint8_t *pb = (uint8_t *)(pvFrame ? pvFrame : mbuf_data(pMBuf));
+        Log3(("D=%.6Rhxs  S=%.6Rhxs  T=%04x IFF\n", pb, pb + 6, RT_BE2H_U16(*(uint16_t *)(pb + 12))));
+    }
+#endif
+    if (vboxNetFltDarwinMBufIsOur(pThis, pMBuf, pvFrame))
+        return 0;
+
+    /*
+     * Active? Retain the instance and increment the busy counter.
+     */
+    if (!vboxNetFltTryRetainBusyActive(pThis))
+        return 0;
+
+    /*
+     * Finalize out-bound packets since the stack puts off finalizing
+     * TCP/IP checksums as long as possible.
+     * ASSUMES this only applies to outbound IP packets.
+     */
+    if (fSrc == INTNETTRUNKDIR_HOST)
+    {
+        Assert(!pvFrame);
+        mbuf_outbound_finalize(pMBuf, eProtocol, sizeof(RTNETETHERHDR));
+    }
+
+    /*
+     * Create a (scatter/)gather list for the mbuf and feed it to the internal network.
+     */
+    bool fDropIt = false;
+    unsigned cSegs = vboxNetFltDarwinMBufCalcSGSegs(pThis, pMBuf, pvFrame);
+    if (cSegs < VBOXNETFLT_DARWIN_MAX_SEGS)
+    {
+        PINTNETSG pSG = (PINTNETSG)alloca(RT_UOFFSETOF_DYN(INTNETSG, aSegs[cSegs]));
+        vboxNetFltDarwinMBufToSG(pThis, pMBuf, pvFrame, pSG, cSegs, fSrc);
+
+        fDropIt = pThis->pSwitchPort->pfnRecv(pThis->pSwitchPort, NULL /* pvIf */, pSG, fSrc);
+        if (fDropIt)
+        {
+            /*
+             * If the interface is in promiscuous mode we should let
+             * all inbound packets (this one was for a bridged guest)
+             * reach the driver as it passes them to tap callbacks in
+             * order for BPF to work properly.
+             */
+            if (   fSrc == INTNETTRUNKDIR_WIRE
+                && vboxNetFltDarwinIsPromiscuous(pThis))
+            {
+                fDropIt = false;
+            }
+
+            /*
+             * A packet from the host to a guest.  As we won't pass it
+             * to the drvier/wire we need to feed it to bpf ourselves.
+             *
+             * XXX: TODO: bpf should be done before; use pfnPreRecv?
+             */
+            if (fSrc == INTNETTRUNKDIR_HOST)
+            {
+                bpf_tap_out(pThis->u.s.pIfNet, DLT_EN10MB, pMBuf, NULL, 0);
+                ifnet_stat_increment_out(pThis->u.s.pIfNet, 1, mbuf_len(pMBuf), 0);
+            }
+        }
+    }
+
+    vboxNetFltRelease(pThis, true /* fBusy */);
+
+    if (fDropIt)
+    {
+        mbuf_freem(pMBuf);
+        return EJUSTRETURN;
+    }
+    return 0;
+}
+
+
+/**
+ * From the host.
+ *
+ * @see iff_output_func in the darwin kpi.
+ */
+static errno_t vboxNetFltDarwinIffOutput(void *pvThis, ifnet_t pIfNet, protocol_family_t eProtocol, mbuf_t *ppMBuf)
+{
+    /** @todo there was some note about the ethernet header here or something like that... */
+
+    NOREF(eProtocol);
+    NOREF(pIfNet);
+    return vboxNetFltDarwinIffInputOutputWorker((PVBOXNETFLTINS)pvThis, *ppMBuf, NULL, INTNETTRUNKDIR_HOST, eProtocol);
+}
+
+
+/**
+ * From the wire.
+ *
+ * @see iff_input_func in the darwin kpi.
+ */
+static errno_t vboxNetFltDarwinIffInput(void *pvThis, ifnet_t pIfNet, protocol_family_t eProtocol, mbuf_t *ppMBuf, char **ppchFrame)
+{
+    RT_NOREF(eProtocol, pIfNet);
+    return vboxNetFltDarwinIffInputOutputWorker((PVBOXNETFLTINS)pvThis, *ppMBuf, *ppchFrame, INTNETTRUNKDIR_WIRE, eProtocol);
+}
+
+
+/** A worker thread for vboxNetFltSendDummy(). */
+static DECLCALLBACK(int) vboxNetFltSendDummyWorker(RTTHREAD hThreadSelf, void *pvUser)
+{
+    RT_NOREF(hThreadSelf);
+    Assert(pvUser);
+    ifnet_t pIfNet = (ifnet_t)pvUser;
+    return VBoxNetSendDummy(pIfNet);
+}
+
+
+/**
+ * Prevent GUI icon freeze issue when VirtualBoxVM process terminates.
+ *
+ * This function is a workaround for stuck-in-dock issue.  The idea here is to
+ * send a dummy packet to an interface from the context of a kernel thread.
+ * Therefore, an XNU's receive thread (which is created as a result if we are
+ * the first who is communicating with the interface) will be associated with
+ * the kernel thread instead of VirtualBoxVM process.
+ *
+ * @param pIfNet    Interface to be used to send data.
+ */
+static void vboxNetFltSendDummy(ifnet_t pIfNet)
+{
+    RTTHREAD hThread;
+    int rc = RTThreadCreate(&hThread, vboxNetFltSendDummyWorker, (void *)pIfNet, 0,
+                            RTTHREADTYPE_DEFAULT, RTTHREADFLAGS_WAITABLE, "DummyThread");
+    if (RT_SUCCESS(rc))
+    {
+        RTThreadWait(hThread, RT_INDEFINITE_WAIT, NULL);
+        LogFlow(("vboxNetFltSendDummy: a dummy packet has been successfully sent in order to prevent stuck-in-dock issue\n"));
+    }
+    else
+        LogFlow(("vboxNetFltSendDummy: unable to send dummy packet in order to prevent stuck-in-dock issue\n"));
+}
+
+
+/**
+ * Internal worker for vboxNetFltOsInitInstance and vboxNetFltOsMaybeRediscovered.
+ *
+ * @returns VBox status code.
+ * @param   pThis           The instance.
+ * @param   fRediscovery    If set we're doing a rediscovery attempt, so, don't
+ *                          flood the release log.
+ */
+static int vboxNetFltDarwinAttachToInterface(PVBOXNETFLTINS pThis, bool fRediscovery)
+{
+    LogFlow(("vboxNetFltDarwinAttachToInterface: pThis=%p (%s)\n", pThis, pThis->szName));
+    IPRT_DARWIN_SAVE_EFL_AC();
+
+    /*
+     * Locate the interface first.
+     *
+     * The pIfNet member is updated before iflt_attach is called and used
+     * to deal with the hypothetical case where someone rips out the
+     * interface immediately after our iflt_attach call.
+     */
+    ifnet_t pIfNet = NULL;
+    errno_t err = ifnet_find_by_name(pThis->szName, &pIfNet);
+    if (err)
+    {
+        Assert(err == ENXIO);
+        if (!fRediscovery)
+            LogRel(("VBoxFltDrv: failed to find ifnet '%s' (err=%d)\n", pThis->szName, err));
+        else
+            Log(("VBoxFltDrv: failed to find ifnet '%s' (err=%d)\n", pThis->szName, err));
+        IPRT_DARWIN_RESTORE_EFL_AC();
+        return VERR_INTNET_FLT_IF_NOT_FOUND;
+    }
+
+    AssertCompileMemberAlignment(VBOXNETFLTINS, u.s.pIfNet, ARCH_BITS / 8);
+    AssertMsg(!((uintptr_t)&pThis->u.s.pIfNet & (ARCH_BITS / 8 - 1)), ("pThis=%p\n", pThis));
+    RTSpinlockAcquire(pThis->hSpinlock);
+    ASMAtomicUoWritePtr(&pThis->u.s.pIfNet, pIfNet);
+    RTSpinlockRelease(pThis->hSpinlock);
+
+    /* Adjust g_offIfNetPCount as it varies for different versions of xnu. */
+    vboxNetFltDarwinDetectPCountOffset(pIfNet);
+
+    /* Prevent stuck-in-dock issue by associating interface receive thread with kernel thread. */
+    vboxNetFltSendDummy(pIfNet);
+
+    /*
+     * Get the mac address while we still have a valid ifnet reference.
+     */
+    err = ifnet_lladdr_copy_bytes(pIfNet, &pThis->u.s.MacAddr, sizeof(pThis->u.s.MacAddr));
+    if (!err)
+    {
+        /*
+         * Try attach the filter.
+         */
+        struct iff_filter RegRec;
+        RegRec.iff_cookie   = pThis;
+        RegRec.iff_name     = "VBoxNetFlt";
+        RegRec.iff_protocol = 0;
+        RegRec.iff_input    = vboxNetFltDarwinIffInput;
+        RegRec.iff_output   = vboxNetFltDarwinIffOutput;
+        RegRec.iff_event    = vboxNetFltDarwinIffEvent;
+        RegRec.iff_ioctl    = vboxNetFltDarwinIffIoCtl;
+        RegRec.iff_detached = vboxNetFltDarwinIffDetached;
+        interface_filter_t pIfFilter = NULL;
+        err = iflt_attach(pIfNet, &RegRec, &pIfFilter);
+        Assert(err || pIfFilter);
+
+        RTSpinlockAcquire(pThis->hSpinlock);
+        pIfNet = ASMAtomicUoReadPtrT(&pThis->u.s.pIfNet, ifnet_t);
+        if (pIfNet && !err)
+        {
+            ASMAtomicUoWriteBool(&pThis->fDisconnectedFromHost, false);
+            ASMAtomicUoWritePtr(&pThis->u.s.pIfFilter, pIfFilter);
+            pIfNet = NULL; /* don't dereference it */
+        }
+        RTSpinlockRelease(pThis->hSpinlock);
+
+        /* Report capabilities. */
+        if (   !pIfNet
+            && vboxNetFltTryRetainBusyNotDisconnected(pThis))
+        {
+            Assert(pThis->pSwitchPort);
+            pThis->pSwitchPort->pfnReportMacAddress(pThis->pSwitchPort, &pThis->u.s.MacAddr);
+#if 0
+            /*
+             * XXX: Don't tell SrvIntNetR0 if the interface is
+             * promiscuous, because there's no code yet to update that
+             * information and we don't want it stuck, spamming all
+             * traffic to the host.
+             */
+            pThis->pSwitchPort->pfnReportPromiscuousMode(pThis->pSwitchPort, vboxNetFltDarwinIsPromiscuous(pThis));
+#endif
+            pThis->pSwitchPort->pfnReportGsoCapabilities(pThis->pSwitchPort, 0,  INTNETTRUNKDIR_WIRE | INTNETTRUNKDIR_HOST);
+            pThis->pSwitchPort->pfnReportNoPreemptDsts(pThis->pSwitchPort, 0 /* none */);
+            vboxNetFltRelease(pThis, true /*fBusy*/);
+        }
+    }
+
+    /* Release the interface on failure. */
+    if (pIfNet)
+        ifnet_release(pIfNet);
+
+    int rc = RTErrConvertFromErrno(err);
+    if (RT_SUCCESS(rc))
+        LogRel(("VBoxFltDrv: attached to '%s' / %RTmac\n", pThis->szName, &pThis->u.s.MacAddr));
+    else
+        LogRel(("VBoxFltDrv: failed to attach to ifnet '%s' (err=%d)\n", pThis->szName, err));
+    IPRT_DARWIN_RESTORE_EFL_AC();
+    return rc;
+}
+
+
+bool vboxNetFltOsMaybeRediscovered(PVBOXNETFLTINS pThis)
+{
+    vboxNetFltDarwinAttachToInterface(pThis, true /* fRediscovery */);
+    return !ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost);
+}
+
+
+int  vboxNetFltPortOsXmit(PVBOXNETFLTINS pThis, void *pvIfData, PINTNETSG pSG, uint32_t fDst)
+{
+    IPRT_DARWIN_SAVE_EFL_AC();
+    NOREF(pvIfData);
+
+    int rc = VINF_SUCCESS;
+    ifnet_t pIfNet = vboxNetFltDarwinRetainIfNet(pThis);
+    if (pIfNet)
+    {
+        /*
+         * Create a mbuf for the gather list and push it onto the wire.
+         * BPF tap and stats will be taken care of by the driver.
+         */
+        if (fDst & INTNETTRUNKDIR_WIRE)
+        {
+            mbuf_t pMBuf = vboxNetFltDarwinMBufFromSG(pThis, pSG);
+            if (pMBuf)
+            {
+                errno_t err = ifnet_output_raw(pIfNet, PF_LINK, pMBuf);
+                if (err)
+                    rc = RTErrConvertFromErrno(err);
+            }
+            else
+                rc = VERR_NO_MEMORY;
+        }
+
+        /*
+         * Create a mbuf for the gather list and push it onto the host stack.
+         * BPF tap and stats are on us.
+         */
+        if (fDst & INTNETTRUNKDIR_HOST)
+        {
+            mbuf_t pMBuf = vboxNetFltDarwinMBufFromSG(pThis, pSG);
+            if (pMBuf)
+            {
+                void *pvEthHdr = mbuf_data(pMBuf);
+                unsigned const cbEthHdr = 14;
+                struct ifnet_stat_increment_param stats;
+
+                RT_ZERO(stats);
+                stats.packets_in = 1;
+                stats.bytes_in = mbuf_len(pMBuf); /* full ethernet frame */
+
+                mbuf_pkthdr_setrcvif(pMBuf, pIfNet);
+                mbuf_pkthdr_setheader(pMBuf, pvEthHdr); /* link-layer header */
+                mbuf_adj(pMBuf, cbEthHdr);              /* move to payload */
+
+#if 0 /* XXX: disabled since we don't request promiscuous from intnet */
+                /*
+                 * TODO: Since intnet knows whether it forwarded us
+                 * this packet because it's for us or because we are
+                 * promiscuous, it can perhaps set a flag for us in
+                 * INTNETSG::fFlags so that we don't have to re-check
+                 * it here.
+                 */
+                PCRTNETETHERHDR pcEthHdr = (PCRTNETETHERHDR)pvEthHdr;
+                if (   (pcEthHdr->DstMac.au8[0] & 1) == 0 /* unicast? */
+                    && memcmp(&pcEthHdr->DstMac, &pThis->u.s.MacAddr, sizeof(RTMAC)) != 0)
+                {
+                    mbuf_setflags_mask(pMBuf, MBUF_PROMISC, MBUF_PROMISC);
+                }
+#endif
+
+                bpf_tap_in(pIfNet, DLT_EN10MB, pMBuf, pvEthHdr, cbEthHdr);
+                errno_t err = ifnet_input(pIfNet, pMBuf, &stats);
+                if (err)
+                    rc = RTErrConvertFromErrno(err);
+            }
+            else
+                rc = VERR_NO_MEMORY;
+        }
+
+        vboxNetFltDarwinReleaseIfNet(pThis, pIfNet);
+    }
+
+    IPRT_DARWIN_RESTORE_EFL_AC();
+    return rc;
+}
+
+
+void vboxNetFltPortOsSetActive(PVBOXNETFLTINS pThis, bool fActive)
+{
+    IPRT_DARWIN_SAVE_EFL_AC();
+    ifnet_t pIfNet = vboxNetFltDarwinRetainIfNet(pThis);
+    if (pIfNet)
+    {
+        if (pThis->fDisablePromiscuous)
+        {
+            /*
+             * Promiscuous mode should not be used (wireless), we just need to
+             * make sure the interface is up.
+             */
+            if (fActive)
+            {
+                u_int16_t fIf = ifnet_flags(pIfNet);
+                if ((fIf & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING))
+                {
+                    ifnet_set_flags(pIfNet, IFF_UP, IFF_UP);
+                    ifnet_ioctl(pIfNet, 0, SIOCSIFFLAGS, NULL);
+                }
+            }
+        }
+        else
+        {
+            /*
+             * This api is a bit weird, the best reference is the code.
+             *
+             * Also, we have a bit or race conditions wrt the maintenance of
+             * host the interface promiscuity for vboxNetFltPortOsIsPromiscuous.
+             */
+            unsigned const cPromiscBefore = VBOX_GET_PCOUNT(pIfNet);
+            u_int16_t fIf;
+            if (fActive)
+            {
+                Assert(!pThis->u.s.fSetPromiscuous);
+                errno_t err = ENETDOWN;
+                ASMAtomicWriteBool(&pThis->u.s.fNeedSetPromiscuous, true);
+
+                /*
+                 * Try bring the interface up and running if it's down.
+                 */
+                fIf = ifnet_flags(pIfNet);
+                if ((fIf & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING))
+                {
+                    err = ifnet_set_flags(pIfNet, IFF_UP, IFF_UP);
+                    errno_t err2 = ifnet_ioctl(pIfNet, 0, SIOCSIFFLAGS, NULL);
+                    if (!err)
+                        err = err2;
+                    fIf = ifnet_flags(pIfNet);
+                }
+
+                /*
+                 * Is it already up?  If it isn't, leave it to the link event or
+                 * we'll upset if_pcount (as stated above, ifnet_set_promiscuous is weird).
+                 */
+                if ((fIf & (IFF_UP | IFF_RUNNING)) == (IFF_UP | IFF_RUNNING))
+                {
+                    err = ifnet_set_promiscuous(pIfNet, 1);
+                    pThis->u.s.fSetPromiscuous = err == 0;
+                    if (!err)
+                    {
+                        ASMAtomicWriteBool(&pThis->u.s.fNeedSetPromiscuous, false);
+
+                        /* check if it actually worked, this stuff is not always behaving well. */
+                        if (!(ifnet_flags(pIfNet) & IFF_PROMISC))
+                        {
+                            err = ifnet_set_flags(pIfNet, IFF_PROMISC, IFF_PROMISC);
+                            if (!err)
+                                err = ifnet_ioctl(pIfNet, 0, SIOCSIFFLAGS, NULL);
+                            if (!err)
+                                Log(("vboxNetFlt: fixed IFF_PROMISC on %s (%d->%d)\n", pThis->szName, cPromiscBefore, VBOX_GET_PCOUNT(pIfNet)));
+                            else
+                                Log(("VBoxNetFlt: failed to fix IFF_PROMISC on %s, err=%d (%d->%d)\n",
+                                     pThis->szName, err, cPromiscBefore, VBOX_GET_PCOUNT(pIfNet)));
+                        }
+                    }
+                    else
+                        Log(("VBoxNetFlt: ifnet_set_promiscuous -> err=%d grr! (%d->%d)\n", err, cPromiscBefore, VBOX_GET_PCOUNT(pIfNet)));
+                }
+                else if (!err)
+                    Log(("VBoxNetFlt: Waiting for the link to come up... (%d->%d)\n", cPromiscBefore, VBOX_GET_PCOUNT(pIfNet)));
+                if (err)
+                    LogRel(("VBoxNetFlt: Failed to put '%s' into promiscuous mode, err=%d (%d->%d)\n", pThis->szName, err, cPromiscBefore, VBOX_GET_PCOUNT(pIfNet)));
+            }
+            else
+            {
+                ASMAtomicWriteBool(&pThis->u.s.fNeedSetPromiscuous, false);
+                if (pThis->u.s.fSetPromiscuous)
+                {
+                    errno_t err = ifnet_set_promiscuous(pIfNet, 0);
+                    AssertMsg(!err, ("%d\n", err)); NOREF(err);
+                }
+                pThis->u.s.fSetPromiscuous = false;
+
+                fIf = ifnet_flags(pIfNet);
+                Log(("VBoxNetFlt: fIf=%#x; %d->%d\n", fIf, cPromiscBefore, VBOX_GET_PCOUNT(pIfNet)));
+            }
+        }
+
+        vboxNetFltDarwinReleaseIfNet(pThis, pIfNet);
+    }
+    IPRT_DARWIN_RESTORE_EFL_AC();
+}
+
+
+int vboxNetFltOsDisconnectIt(PVBOXNETFLTINS pThis)
+{
+    /* Nothing to do here. */
+    RT_NOREF(pThis);
+    return VINF_SUCCESS;
+}
+
+
+int  vboxNetFltOsConnectIt(PVBOXNETFLTINS pThis)
+{
+    /* Nothing to do here. */
+    RT_NOREF(pThis);
+    return VINF_SUCCESS;
+}
+
+
+void vboxNetFltOsDeleteInstance(PVBOXNETFLTINS pThis)
+{
+    IPRT_DARWIN_SAVE_EFL_AC();
+
+    /*
+     * Carefully obtain the interface filter reference and detach it.
+     */
+    RTSpinlockAcquire(pThis->hSpinlock);
+    interface_filter_t pIfFilter = ASMAtomicUoReadPtrT(&pThis->u.s.pIfFilter, interface_filter_t);
+    if (pIfFilter)
+        ASMAtomicUoWriteNullPtr(&pThis->u.s.pIfFilter);
+    RTSpinlockRelease(pThis->hSpinlock);
+
+    if (pIfFilter)
+        iflt_detach(pIfFilter);
+
+    if (pThis->u.s.pSysSock != NULL)
+    {
+        sock_close(pThis->u.s.pSysSock);
+        pThis->u.s.pSysSock = NULL;
+    }
+
+    IPRT_DARWIN_RESTORE_EFL_AC();
+}
+
+
+int  vboxNetFltOsInitInstance(PVBOXNETFLTINS pThis, void *pvContext)
+{
+    NOREF(pvContext);
+
+    int rc = vboxNetFltDarwinAttachToInterface(pThis, false /* fRediscovery */);
+    if (RT_FAILURE(rc))
+        return rc;
+
+    if (pThis->pSwitchPort->pfnNotifyHostAddress == NULL)
+        return rc;
+
+    /*
+     * XXX: uwe
+     *
+     * Learn host's IP addresses and set up notifications for changes.
+     * To avoid racing, set up notifications first.
+     *
+     * XXX: This should probably be global, since the only thing
+     * specific to ifnet here is its IPv6 link-local address.
+     */
+    IPRT_DARWIN_SAVE_EFL_AC();
+    errno_t error;
+
+    /** @todo reorg code to not have numerous returns with duplicate code... */
+    error = sock_socket(PF_SYSTEM, SOCK_RAW, SYSPROTO_EVENT,
+                        vboxNetFltDarwinSysSockUpcall, pThis,
+                        &pThis->u.s.pSysSock);
+    if (error != 0)
+    {
+        LogRel(("sock_socket(SYSPROTO_EVENT): error %d\n", error));
+        IPRT_DARWIN_RESTORE_EFL_AC();
+        return rc;
+    }
+
+    int nbio = 1;
+    error = sock_ioctl(pThis->u.s.pSysSock, FIONBIO, &nbio);
+    if (error != 0)
+    {
+        LogRel(("FIONBIO: error %d\n", error));
+        sock_close(pThis->u.s.pSysSock);
+        IPRT_DARWIN_RESTORE_EFL_AC();
+        return rc;
+    }
+
+    if (!sock_isnonblocking(pThis->u.s.pSysSock))
+    {
+        LogRel(("FIONBIO ok, but socket is blocking?!\n"));
+        sock_close(pThis->u.s.pSysSock);
+        IPRT_DARWIN_RESTORE_EFL_AC();
+        return rc;
+    }
+
+    struct kev_request req;
+    req.vendor_code = KEV_VENDOR_APPLE;
+    req.kev_class = KEV_NETWORK_CLASS;
+    req.kev_subclass = KEV_ANY_SUBCLASS; /* need both INET and INET6, so have to request all */
+
+    error = sock_ioctl(pThis->u.s.pSysSock, SIOCSKEVFILT, &req);
+    if (error != 0)
+    {
+        LogRel(("SIOCSKEVFILT: error %d\n", error));
+        sock_close(pThis->u.s.pSysSock);
+        IPRT_DARWIN_RESTORE_EFL_AC();
+        return rc;
+    }
+
+    ifnet_t pIfNet = pThis->u.s.pIfNet; /* already retained */
+
+    ifaddr_t *pIfAddrList;
+    error = ifnet_get_address_list(/* all interfaces*/ NULL, &pIfAddrList);
+    if (error != 0)
+    {
+        LogRel(("ifnet_get_address_list: error %d\n", error));
+        IPRT_DARWIN_RESTORE_EFL_AC();
+        return rc;
+    }
+
+    for (ifaddr_t *pIfAddr = pIfAddrList; *pIfAddr != NULL; ++pIfAddr)
+    {
+        ifaddr_t ifa = *pIfAddr;
+        sa_family_t family = ifaddr_address_family(ifa);
+        struct sockaddr_storage ss;
+
+        error = ifaddr_address(ifa, (struct sockaddr *)&ss, sizeof(ss));
+        if (error != 0)
+        {
+            LogRel(("getting address family %d: error %d\n", family, error));
+            continue;
+        }
+
+        if (family == AF_INET)
+        {
+            struct sockaddr_in *sin = (struct sockaddr_in *)&ss;
+            u_int32_t u32Addr = ntohl(sin->sin_addr.s_addr);
+
+            if (VBOX_IN_LOOPBACK(u32Addr))
+                continue;
+
+            if (ifaddr_ifnet(ifa) != pIfNet && VBOX_IN_LINKLOCAL(u32Addr))
+                continue;
+
+            Log(("> inet %RTnaipv4\n", sin->sin_addr.s_addr));
+            pThis->pSwitchPort->pfnNotifyHostAddress(pThis->pSwitchPort,
+                /* :fAdded */ true, kIntNetAddrType_IPv4, &sin->sin_addr);
+        }
+        else if (family == AF_INET6)
+        {
+            struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&ss;
+
+            if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
+                continue;
+
+            /* link-local from other interfaces are out of scope */
+            if (ifaddr_ifnet(ifa) != pIfNet && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
+                continue;
+
+            Log(("> inet6 %RTnaipv6\n", &sin6->sin6_addr));
+            pThis->pSwitchPort->pfnNotifyHostAddress(pThis->pSwitchPort,
+                /* :fAdded */ true, kIntNetAddrType_IPv6, &sin6->sin6_addr);
+        }
+    }
+
+    ifnet_free_address_list(pIfAddrList);
+
+    /*
+     * Now that we've got current addresses, check for events that
+     * might have happened while we were working.
+     */
+    vboxNetFltDarwinSysSockUpcall(pThis->u.s.pSysSock, pThis, MBUF_DONTWAIT);
+
+    IPRT_DARWIN_RESTORE_EFL_AC();
+    return rc;
+}
+
+
+static void vboxNetFltDarwinSysSockUpcall(socket_t pSysSock, void *pvData, int fWait)
+{
+    PVBOXNETFLTINS pThis = (PVBOXNETFLTINS)pvData;
+    errno_t error;
+
+    NOREF(fWait);
+
+    if (RT_UNLIKELY(pSysSock != pThis->u.s.pSysSock))
+    {
+        Log(("vboxNetFltDarwinSysSockUpcall: %p != %p?\n",
+             pSysSock, pThis->u.s.pSysSock));
+        return;
+    }
+
+    ifnet_t pIfNet = pThis->u.s.pIfNet; /* XXX: retain? */
+    ifnet_family_t if_family = ifnet_family(pIfNet);
+    u_int32_t if_unit = ifnet_unit(pIfNet);
+
+    for (;;)
+    {
+        mbuf_t m;
+        size_t len = sizeof(struct kern_event_msg) - sizeof(u_int32_t) + sizeof(struct kev_in6_data);
+
+        error = sock_receivembuf(pSysSock, NULL, &m, 0, &len);
+        if (error != 0)
+        {
+            if (error == EWOULDBLOCK)
+            {
+                Log(("vboxNetFltDarwinSysSockUpcall: EWOULDBLOCK - we are done\n"));
+                error = 0;
+            }
+            else
+                Log(("sock_receivembuf: error %d\n", error));
+            break;
+        }
+
+        if (len < sizeof(struct kern_event_msg) - sizeof(u_int32_t))
+        {
+            Log(("vboxNetFltDarwinSysSockUpcall: %u bytes is too short\n", (unsigned int)len));
+            mbuf_freem(m);
+            return;
+        }
+
+        struct kern_event_msg *msg = (struct kern_event_msg *)mbuf_data(m);
+        if (msg->kev_subclass == KEV_INET_SUBCLASS)
+        {
+            if (len - (sizeof(struct kern_event_msg) - sizeof(u_int32_t)) < sizeof(struct kev_in_data))
+            {
+                Log(("vboxNetFltDarwinSysSockUpcall: %u bytes is too short for KEV_INET_SUBCLASS\n",
+                     (unsigned int)len));
+                mbuf_freem(m);
+                return;
+            }
+
+            struct kev_in_data *iev = (struct kev_in_data *)msg->event_data;
+            struct net_event_data *link = &iev->link_data;
+            PCRTNETADDRU pAddr = (PCRTNETADDRU)&iev->ia_addr;
+            u_int32_t u32Addr = ntohl(pAddr->IPv4.u);
+
+            if (VBOX_IN_LOOPBACK(u32Addr))
+            {
+                mbuf_freem(m);
+                continue;
+            }
+
+            if (   (link->if_family != if_family || link->if_unit != if_unit)
+                && VBOX_IN_LINKLOCAL(u32Addr))
+            {
+                mbuf_freem(m);
+                continue;
+            }
+
+            switch (msg->event_code)
+            {
+                case KEV_INET_NEW_ADDR:
+                    Log(("KEV_INET_NEW_ADDR %.*s%d: %RTnaipv4\n", IFNAMSIZ, link->if_name, link->if_unit, pAddr->IPv4.u));
+                    pThis->pSwitchPort->pfnNotifyHostAddress(pThis->pSwitchPort, true /*fAdded*/, kIntNetAddrType_IPv4, pAddr);
+                    break;
+
+                case KEV_INET_ADDR_DELETED:
+                    Log(("KEV_INET_ADDR_DELETED %.*s%d: %RTnaipv4\n", IFNAMSIZ, link->if_name, link->if_unit, pAddr->IPv4.u));
+                    pThis->pSwitchPort->pfnNotifyHostAddress(pThis->pSwitchPort, false /*fAdded*/, kIntNetAddrType_IPv4, pAddr);
+                    break;
+
+                default:
+                    Log(("KEV INET event %u %.*s%d: addr %RTnaipv4\n",
+                         msg->event_code, IFNAMSIZ, link->if_name, link->if_unit, pAddr->IPv4.u));
+                    break;
+            }
+        }
+        else if (msg->kev_subclass == KEV_INET6_SUBCLASS)
+        {
+            if (len - (sizeof(struct kern_event_msg) - sizeof(u_int32_t)) < sizeof(struct kev_in6_data))
+            {
+                Log(("vboxNetFltDarwinSysSockUpcall: %u bytes is too short for KEV_INET6_SUBCLASS\n",
+                        (unsigned int)len));
+                mbuf_freem(m);
+                return;
+            }
+
+            struct kev_in6_data *iev6 = (struct kev_in6_data *)msg->event_data;
+            struct net_event_data *link = &iev6->link_data;
+            PCRTNETADDRU pAddr = (PCRTNETADDRU)&iev6->ia_addr.sin6_addr;
+
+            if (IN6_IS_ADDR_LOOPBACK(&iev6->ia_addr.sin6_addr))
+            {
+                mbuf_freem(m);
+                continue;
+            }
+
+            if (   (link->if_family != if_family || link->if_unit != if_unit)
+                && IN6_IS_ADDR_LINKLOCAL(&iev6->ia_addr.sin6_addr))
+            {
+                mbuf_freem(m);
+                continue;
+            }
+
+            switch (msg->event_code)
+            {
+                case KEV_INET6_NEW_USER_ADDR:
+                    Log(("KEV_INET6_NEW_USER_ADDR %.*s%d: %RTnaipv6\n",
+                         IFNAMSIZ, link->if_name, link->if_unit, pAddr));
+                    goto kev_inet6_new;
+
+                case KEV_INET6_NEW_LL_ADDR:
+                    Log(("KEV_INET6_NEW_LL_ADDR %.*s%d: %RTnaipv6\n",
+                         IFNAMSIZ, link->if_name, link->if_unit, pAddr));
+                    goto kev_inet6_new;
+
+                case KEV_INET6_NEW_RTADV_ADDR:
+                    Log(("KEV_INET6_NEW_RTADV_ADDR %.*s%d: %RTnaipv6\n",
+                         IFNAMSIZ, link->if_name, link->if_unit, pAddr));
+                    goto kev_inet6_new;
+
+                kev_inet6_new:
+                    pThis->pSwitchPort->pfnNotifyHostAddress(pThis->pSwitchPort,
+                        /* :fAdded */ true, kIntNetAddrType_IPv6, pAddr);
+                    break;
+
+                case KEV_INET6_ADDR_DELETED:
+                    Log(("KEV_INET6_ADDR_DELETED %.*s%d: %RTnaipv6\n",
+                         IFNAMSIZ, link->if_name, link->if_unit, pAddr));
+
+                    pThis->pSwitchPort->pfnNotifyHostAddress(pThis->pSwitchPort,
+                        /* :fAdded */ false, kIntNetAddrType_IPv6, pAddr);
+                    break;
+
+                default:
+                    Log(("KEV INET6 event %u %.*s%d: addr %RTnaipv6\n",
+                         msg->event_code, IFNAMSIZ, link->if_name, link->if_unit, pAddr));
+                    break;
+            }
+        }
+        else
+            Log(("vboxNetFltDarwinSysSockUpcall: subclass %u ignored\n", (unsigned)msg->kev_subclass));
+
+        mbuf_freem(m);
+    }
+}
+
+
+int  vboxNetFltOsPreInitInstance(PVBOXNETFLTINS pThis)
+{
+    /*
+     * Init the darwin specific members.
+     */
+    pThis->u.s.pIfNet = NULL;
+    pThis->u.s.pIfFilter = NULL;
+    pThis->u.s.fSetPromiscuous = false;
+    pThis->u.s.fNeedSetPromiscuous = false;
+    //pThis->u.s.MacAddr = {0};
+    pThis->u.s.pSysSock = NULL;
+
+    return VINF_SUCCESS;
+}
+
+
+void vboxNetFltPortOsNotifyMacAddress(PVBOXNETFLTINS pThis, void *pvIfData, PCRTMAC pMac)
+{
+    NOREF(pThis); NOREF(pvIfData); NOREF(pMac);
+}
+
+
+int vboxNetFltPortOsConnectInterface(PVBOXNETFLTINS pThis, void *pvIf, void **ppvIfData)
+{
+    /* Nothing to do */
+    NOREF(pThis); NOREF(pvIf); NOREF(ppvIfData);
+    return VINF_SUCCESS;
+}
+
+
+int vboxNetFltPortOsDisconnectInterface(PVBOXNETFLTINS pThis, void *pvIfData)
+{
+    /* Nothing to do */
+    NOREF(pThis); NOREF(pvIfData);
+    return VINF_SUCCESS;
+}
+
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/darwin/loadnetflt.sh b/src/VBox/HostDrivers/VBoxNetFlt/darwin/loadnetflt.sh
new file mode 100755
index 00000000..d689feca
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/darwin/loadnetflt.sh
@@ -0,0 +1,123 @@
+#!/bin/bash
+## @file
+# For development.
+#
+
+#
+# Copyright (C) 2006-2020 Oracle Corporation
+#
+# This file is part of VirtualBox Open Source Edition (OSE), as
+# available from http://www.virtualbox.org. This file is free software;
+# you can redistribute it and/or modify it under the terms of the GNU
+# General Public License (GPL) as published by the Free Software
+# Foundation, in version 2 as it comes in the "COPYING" file of the
+# VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+# hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+#
+# The contents of this file may alternatively be used under the terms
+# of the Common Development and Distribution License Version 1.0
+# (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+# VirtualBox OSE distribution, in which case the provisions of the
+# CDDL are applicable instead of those of the GPL.
+#
+# You may elect to license modified versions of this file under the
+# terms and conditions of either the GPL or the CDDL or both.
+#
+
+SCRIPT_NAME="loadnetflt"
+XNU_VERSION=`LC_ALL=C uname -r | LC_ALL=C cut -d . -f 1`
+
+DRVNAME="VBoxNetFlt.kext"
+BUNDLE="org.virtualbox.kext.VBoxNetFlt"
+
+DEP_DRVNAME="VBoxDrv.kext"
+DEP_BUNDLE="org.virtualbox.kext.VBoxDrv"
+
+
+DIR=`dirname "$0"`
+DIR=`cd "$DIR" && pwd`
+DEP_DIR="$DIR/$DEP_DRVNAME"
+DIR="$DIR/$DRVNAME"
+if [ ! -d "$DIR" ]; then
+    echo "Cannot find $DIR or it's not a directory..."
+    exit 1;
+fi
+if [ ! -d "$DEP_DIR" ]; then
+    echo "Cannot find $DEP_DIR or it's not a directory... (dependency)"
+    exit 1;
+fi
+if [ -n "$*" ]; then
+  OPTS="$*"
+else
+  OPTS="-t"
+fi
+
+trap "sudo chown -R `whoami` $DIR $DEP_DIR; exit 1" INT
+
+# Try unload any existing instance first.
+LOADED=`kextstat -b $BUNDLE -l`
+if test -n "$LOADED"; then
+    echo "${SCRIPT_NAME}.sh: Unloading $BUNDLE..."
+    sudo kextunload -v 6 -b $BUNDLE
+    LOADED=`kextstat -b $BUNDLE -l`
+    if test -n "$LOADED"; then
+        echo "${SCRIPT_NAME}.sh: failed to unload $BUNDLE, see above..."
+        exit 1;
+    fi
+    echo "${SCRIPT_NAME}.sh: Successfully unloaded $BUNDLE"
+fi
+
+set -e
+
+# Copy the .kext to the symbols directory and tweak the kextload options.
+if test -n "$VBOX_DARWIN_SYMS"; then
+    echo "${SCRIPT_NAME}.sh: copying the extension the symbol area..."
+    rm -Rf "$VBOX_DARWIN_SYMS/$DRVNAME"
+    mkdir -p "$VBOX_DARWIN_SYMS"
+    cp -R "$DIR" "$VBOX_DARWIN_SYMS/"
+    OPTS="$OPTS -s $VBOX_DARWIN_SYMS/ "
+    sync
+fi
+
+# On smbfs, this might succeed just fine but make no actual changes,
+# so we might have to temporarily copy the driver to a local directory.
+if sudo chown -R root:wheel "$DIR" "$DEP_DIR"; then
+    OWNER=`/usr/bin/stat -f "%u" "$DIR"`
+else
+    OWNER=1000
+fi
+if test "$OWNER" -ne 0; then
+    TMP_DIR=/tmp/${SCRIPT_NAME}.tmp
+    echo "${SCRIPT_NAME}.sh: chown didn't work on $DIR, using temp location $TMP_DIR/$DRVNAME"
+
+    # clean up first (no sudo rm)
+    if test -e "$TMP_DIR"; then
+        sudo chown -R `whoami` "$TMP_DIR"
+        rm -Rf "$TMP_DIR"
+    fi
+
+    # make a copy and switch over DIR
+    mkdir -p "$TMP_DIR/"
+    sudo cp -Rp "$DIR" "$TMP_DIR/"
+    DIR="$TMP_DIR/$DRVNAME"
+
+    # load.sh puts it here.
+    DEP_DIR="/tmp/loaddrv.tmp/$DEP_DRVNAME"
+
+    # retry
+    sudo chown -R root:wheel "$DIR" "$DEP_DIR"
+fi
+
+sudo chmod -R o-rwx "$DIR"
+sync
+if [ "$XNU_VERSION" -ge "10" ]; then
+    echo "${SCRIPT_NAME}.sh: loading $DIR... (kextutil $OPTS -d \"$DEP_DIR\" \"$DIR\")"
+    sudo kextutil $OPTS -d "$DEP_DIR" "$DIR"
+else
+    echo "${SCRIPT_NAME}.sh: loading $DIR... (kextload $OPTS -d \"$DEP_DIR\" \"$DIR\")"
+sudo kextload $OPTS -d "$DEP_DIR" "$DIR"
+fi
+sync
+sudo chown -R `whoami` "$DIR" "$DEP_DIR"
+kextstat | grep org.virtualbox.kext
+
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/freebsd/Makefile b/src/VBox/HostDrivers/VBoxNetFlt/freebsd/Makefile
new file mode 100644
index 00000000..6b279e66
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/freebsd/Makefile
@@ -0,0 +1,47 @@
+# $Id: Makefile $
+## @file
+# Makefile for the VirtualBox FreeBSD Host Driver.
+#
+
+#
+# Copyright (C) 2006-2020 Oracle Corporation
+#
+# This file is part of VirtualBox Open Source Edition (OSE), as
+# available from http://www.virtualbox.org. This file is free software;
+# you can redistribute it and/or modify it under the terms of the GNU
+# General Public License (GPL) as published by the Free Software
+# Foundation, in version 2 as it comes in the "COPYING" file of the
+# VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+# hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+#
+# The contents of this file may alternatively be used under the terms
+# of the Common Development and Distribution License Version 1.0
+# (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+# VirtualBox OSE distribution, in which case the provisions of the
+# CDDL are applicable instead of those of the GPL.
+#
+# You may elect to license modified versions of this file under the
+# terms and conditions of either the GPL or the CDDL or both.
+#
+
+KMOD = vboxnetflt
+
+CFLAGS += -DRT_OS_FREEBSD -DIN_RING0 -DIN_RT_R0 -DIN_SUP_R0 -DVBOX -DRT_WITH_VBOX -Iinclude -I. -Ir0drv -w -DVBOX_WITH_HARDENING -DVIMAGE
+
+.if (${MACHINE_ARCH} == "i386")
+ CFLAGS += -DRT_ARCH_X86
+.elif (${MACHINE_ARCH} == "amd64")
+ CFLAGS += -DRT_ARCH_AMD64
+.endif
+
+SRCS = \
+	VBoxNetFlt-freebsd.c \
+	VBoxNetFlt.c \
+	SUPR0IdcClient-freebsd.c \
+	SUPR0IdcClient.c \
+	SUPR0IdcClientComponent.c
+
+SRCS += device_if.h bus_if.h opt_netgraph.h
+
+.include <bsd.kmod.mk>
+
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/freebsd/VBoxNetFlt-freebsd.c b/src/VBox/HostDrivers/VBoxNetFlt/freebsd/VBoxNetFlt-freebsd.c
new file mode 100644
index 00000000..b8b4212e
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/freebsd/VBoxNetFlt-freebsd.c
@@ -0,0 +1,817 @@
+/* $Id: VBoxNetFlt-freebsd.c $ */
+/** @file
+ * VBoxNetFlt - Network Filter Driver (Host), FreeBSD Specific Code.
+ */
+
+/*
+ * Copyright (c) 2009 Fredrik Lindberg <fli@shapeshifter.se>
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <sys/param.h>
+#undef PVM
+#include <sys/types.h>
+#include <sys/module.h>
+#include <sys/systm.h>
+#include <sys/errno.h>
+#include <sys/kernel.h>
+#include <sys/fcntl.h>
+#include <sys/conf.h>
+#include <sys/socket.h>
+#include <sys/sockio.h>
+#include <sys/syscallsubr.h>
+#include <sys/queue.h>
+#include <sys/taskqueue.h>
+
+#include <net/if.h>
+#include <net/if_var.h>
+#include <net/if_dl.h>
+#include <net/if_types.h>
+#include <net/ethernet.h>
+
+#include <netgraph/ng_message.h>
+#include <netgraph/netgraph.h>
+#include <netgraph/ng_parse.h>
+
+#define LOG_GROUP LOG_GROUP_NET_FLT_DRV
+#include <VBox/version.h>
+#include <VBox/err.h>
+#include <VBox/log.h>
+#include <VBox/intnetinline.h>
+#include <iprt/initterm.h>
+#include <iprt/string.h>
+#include <iprt/spinlock.h>
+#include <iprt/process.h>
+#include <iprt/assert.h>
+#include <iprt/uuid.h>
+#include <iprt/alloc.h>
+#include <iprt/err.h>
+
+#define VBOXNETFLT_OS_SPECFIC 1
+#include "../VBoxNetFltInternal.h"
+
+static int vboxnetflt_modevent(struct module *, int, void *);
+static ng_constructor_t    ng_vboxnetflt_constructor;
+static ng_rcvmsg_t    ng_vboxnetflt_rcvmsg;
+static ng_shutdown_t    ng_vboxnetflt_shutdown;
+static ng_newhook_t    ng_vboxnetflt_newhook;
+static ng_rcvdata_t    ng_vboxnetflt_rcvdata;
+static ng_disconnect_t    ng_vboxnetflt_disconnect;
+static int        ng_vboxnetflt_mod_event(module_t mod, int event, void *data);
+
+/** Netgraph node type */
+#define NG_VBOXNETFLT_NODE_TYPE     "vboxnetflt"
+/** Netgraph message cookie */
+#define NGM_VBOXNETFLT_COOKIE       0x56424f58
+
+/** Input netgraph hook name */
+#define NG_VBOXNETFLT_HOOK_IN       "input"
+/** Output netgraph hook name */
+#define NG_VBOXNETFLT_HOOK_OUT      "output"
+
+/** mbuf tag identifier */
+#define MTAG_VBOX                   0x56424f58
+/** mbuf packet tag */
+#define PACKET_TAG_VBOX             128
+
+#if defined(__FreeBSD_version) && __FreeBSD_version >= 800500
+# include <sys/jail.h>
+# include <net/vnet.h>
+
+# define VBOXCURVNET_SET(arg)           CURVNET_SET_QUIET(arg)
+# define VBOXCURVNET_SET_FROM_UCRED()   VBOXCURVNET_SET(CRED_TO_VNET(curthread->td_ucred))
+# define VBOXCURVNET_RESTORE()          CURVNET_RESTORE()
+
+#else /* !defined(__FreeBSD_version) || __FreeBSD_version < 800500 */
+
+# define VBOXCURVNET_SET(arg)
+# define VBOXCURVNET_SET_FROM_UCRED()
+# define VBOXCURVNET_RESTORE()
+
+#endif /* !defined(__FreeBSD_version) || __FreeBSD_version < 800500 */
+
+/*
+ * Netgraph command list, we don't support any
+ * additional commands.
+ */
+static const struct ng_cmdlist ng_vboxnetflt_cmdlist[] =
+{
+    { 0 }
+};
+
+/*
+ * Netgraph type definition
+ */
+static struct ng_type ng_vboxnetflt_typestruct =
+{
+    .version    = NG_ABI_VERSION,
+    .name       = NG_VBOXNETFLT_NODE_TYPE,
+    .mod_event  = vboxnetflt_modevent,
+    .constructor= ng_vboxnetflt_constructor,
+    .rcvmsg     = ng_vboxnetflt_rcvmsg,
+    .shutdown   = ng_vboxnetflt_shutdown,
+    .newhook    = ng_vboxnetflt_newhook,
+    .rcvdata    = ng_vboxnetflt_rcvdata,
+    .disconnect = ng_vboxnetflt_disconnect,
+    .cmdlist    = ng_vboxnetflt_cmdlist,
+};
+NETGRAPH_INIT(vboxnetflt, &ng_vboxnetflt_typestruct);
+
+/*
+ * Use vboxnetflt because the kernel module is named vboxnetflt and vboxnetadp
+ * depends on this when loading dependencies.
+ * NETGRAP_INIT will prefix the given name with ng_ so MODULE_DEPEND needs the
+ * prefixed name.
+ */
+MODULE_VERSION(vboxnetflt, 1);
+MODULE_DEPEND(ng_vboxnetflt, vboxdrv, 1, 1, 1);
+
+/**
+ * The (common) global data.
+ */
+static VBOXNETFLTGLOBALS g_VBoxNetFltGlobals;
+
+/**
+ * Module event handler, called from netgraph subsystem.
+ */
+static int vboxnetflt_modevent(struct module *pMod, int enmEventType, void *pvArg)
+{
+    int rc;
+
+    Log(("VBoxNetFltFreeBSDModuleEvent\n"));
+
+    switch (enmEventType)
+    {
+        case MOD_LOAD:
+            rc = RTR0Init(0);
+            if (RT_FAILURE(rc))
+            {
+                printf("RTR0Init failed %d\n", rc);
+                return RTErrConvertToErrno(rc);
+            }
+
+            memset(&g_VBoxNetFltGlobals, 0, sizeof(VBOXNETFLTGLOBALS));
+            rc = vboxNetFltInitGlobalsAndIdc(&g_VBoxNetFltGlobals);
+            if (RT_FAILURE(rc))
+            {
+                printf("vboxNetFltInitGlobalsAndIdc failed %d\n", rc);
+                return RTErrConvertToErrno(rc);
+            }
+            /* No MODULE_VERSION in ng_ether so we can't MODULE_DEPEND it */
+            kern_kldload(curthread, "ng_ether", NULL);
+            break;
+
+        case MOD_UNLOAD:
+            rc = vboxNetFltTryDeleteIdcAndGlobals(&g_VBoxNetFltGlobals);
+            memset(&g_VBoxNetFltGlobals, 0, sizeof(VBOXNETFLTGLOBALS));
+            RTR0Term();
+            break;
+
+        case MOD_SHUTDOWN:
+        case MOD_QUIESCE:
+        default:
+            return EOPNOTSUPP;
+    }
+
+    if (RT_SUCCESS(rc))
+        return 0;
+    return RTErrConvertToErrno(rc);
+}
+
+/*
+ * Convert from mbufs to vbox scatter-gather data structure
+ */
+static void vboxNetFltFreeBSDMBufToSG(PVBOXNETFLTINS pThis, struct mbuf *m, PINTNETSG pSG,
+    unsigned int cSegs, unsigned int segOffset)
+{
+    static uint8_t const s_abZero[128] = {0};
+    unsigned int i;
+    struct mbuf *m0;
+
+    IntNetSgInitTempSegs(pSG, m_length(m, NULL), cSegs, 0 /*cSegsUsed*/);
+
+    for (m0 = m, i = segOffset; m0; m0 = m0->m_next)
+    {
+        if (m0->m_len == 0)
+            continue;
+
+        pSG->aSegs[i].cb = m0->m_len;
+        pSG->aSegs[i].pv = mtod(m0, uint8_t *);
+        pSG->aSegs[i].Phys = NIL_RTHCPHYS;
+        i++;
+    }
+
+#ifdef PADD_RUNT_FRAMES_FROM_HOST
+    if (pSG->cbTotal < 60)
+    {
+        pSG->aSegs[i].Phys = NIL_RTHCPHYS;
+        pSG->aSegs[i].pv = (void *)&s_abZero[0];
+        pSG->aSegs[i].cb = 60 - pSG->cbTotal;
+        pSG->cbTotal = 60;
+        i++;
+    }
+#endif
+
+    pSG->cSegsUsed = i;
+}
+
+/*
+ * Convert to mbufs from vbox scatter-gather data structure
+ */
+static struct mbuf * vboxNetFltFreeBSDSGMBufFromSG(PVBOXNETFLTINS pThis, PINTNETSG pSG)
+{
+    struct mbuf *m;
+    int error;
+    unsigned int i;
+
+    if (pSG->cbTotal == 0)
+        return (NULL);
+
+    m = m_getcl(M_WAITOK, MT_DATA, M_PKTHDR);
+    if (m == NULL)
+        return (NULL);
+
+    m->m_pkthdr.len = m->m_len = 0;
+    m->m_pkthdr.rcvif = NULL;
+
+    for (i = 0; i < pSG->cSegsUsed; i++)
+    {
+        error = m_append(m, pSG->aSegs[i].cb, pSG->aSegs[i].pv);
+        if (error == 0)
+        {
+            m_freem(m);
+            return (NULL);
+        }
+    }
+    return (m);
+}
+
+
+static int ng_vboxnetflt_constructor(node_p node)
+{
+    /* Nothing to do */
+    return (EINVAL);
+}
+
+/*
+ * Setup netgraph hooks
+ */
+static int ng_vboxnetflt_newhook(node_p node, hook_p hook, const char *name)
+{
+    PVBOXNETFLTINS pThis = NG_NODE_PRIVATE(node);
+
+    if (strcmp(name, NG_VBOXNETFLT_HOOK_IN) == 0)
+    {
+#if __FreeBSD_version >= 800000
+        NG_HOOK_SET_TO_INBOUND(hook);
+#endif
+        pThis->u.s.input = hook;
+    }
+    else if (strcmp(name, NG_VBOXNETFLT_HOOK_OUT) == 0)
+    {
+        pThis->u.s.output = hook;
+    }
+    else
+        return (EINVAL);
+
+    NG_HOOK_HI_STACK(hook);
+    return (0);
+}
+
+/**
+ * Netgraph message processing for node specific messages.
+ * We don't accept any special messages so this is not used.
+ */
+static int ng_vboxnetflt_rcvmsg(node_p node, item_p item, hook_p lasthook)
+{
+    PVBOXNETFLTINS pThis = NG_NODE_PRIVATE(node);
+    struct ng_mesg *msg;
+    int error = 0;
+
+    NGI_GET_MSG(item, msg);
+    if (msg->header.typecookie != NGM_VBOXNETFLT_COOKIE)
+        return (EINVAL);
+
+    switch (msg->header.cmd)
+    {
+        default:
+            error = EINVAL;
+    }
+    return (error);
+}
+
+/**
+ * Handle data on netgraph hooks.
+ * Frames processing is deferred to a taskqueue because this might
+ * be called with non-sleepable locks held and code paths inside
+ * the virtual switch might sleep.
+ */
+static int ng_vboxnetflt_rcvdata(hook_p hook, item_p item)
+{
+    const node_p node = NG_HOOK_NODE(hook);
+    PVBOXNETFLTINS pThis = NG_NODE_PRIVATE(node);
+    struct ifnet *ifp = pThis->u.s.ifp;
+    struct mbuf *m;
+    struct m_tag *mtag;
+    bool fActive;
+
+    VBOXCURVNET_SET(ifp->if_vnet);
+    fActive = vboxNetFltTryRetainBusyActive(pThis);
+
+    NGI_GET_M(item, m);
+    NG_FREE_ITEM(item);
+
+    /* Locate tag to see if processing should be skipped for this frame */
+    mtag = m_tag_locate(m, MTAG_VBOX, PACKET_TAG_VBOX, NULL);
+    if (mtag != NULL)
+    {
+        m_tag_unlink(m, mtag);
+        m_tag_free(mtag);
+    }
+
+    /*
+     * Handle incoming hook. This is connected to the
+     * input path of the interface, thus handling incoming frames.
+     */
+    if (pThis->u.s.input == hook)
+    {
+        if (mtag != NULL || !fActive)
+        {
+            ether_demux(ifp, m);
+            if (fActive)
+                vboxNetFltRelease(pThis, true /*fBusy*/);
+            VBOXCURVNET_RESTORE();
+            return (0);
+        }
+        mtx_lock_spin(&pThis->u.s.inq.ifq_mtx);
+        _IF_ENQUEUE(&pThis->u.s.inq, m);
+        mtx_unlock_spin(&pThis->u.s.inq.ifq_mtx);
+#if __FreeBSD_version > 1100100
+        taskqueue_enqueue(taskqueue_fast, &pThis->u.s.tskin);
+#else
+        taskqueue_enqueue_fast(taskqueue_fast, &pThis->u.s.tskin);
+#endif
+    }
+    /*
+     * Handle mbufs on the outgoing hook, frames going to the interface
+     */
+    else if (pThis->u.s.output == hook)
+    {
+        if (mtag != NULL || !fActive)
+        {
+            int rc = ether_output_frame(ifp, m);
+            if (fActive)
+                vboxNetFltRelease(pThis, true /*fBusy*/);
+            VBOXCURVNET_RESTORE();
+            return rc;
+        }
+        mtx_lock_spin(&pThis->u.s.outq.ifq_mtx);
+        _IF_ENQUEUE(&pThis->u.s.outq, m);
+        mtx_unlock_spin(&pThis->u.s.outq.ifq_mtx);
+#if __FreeBSD_version > 1100100
+        taskqueue_enqueue(taskqueue_fast, &pThis->u.s.tskout);
+#else
+        taskqueue_enqueue_fast(taskqueue_fast, &pThis->u.s.tskout);
+#endif
+    }
+    else
+    {
+        m_freem(m);
+    }
+
+    if (fActive)
+        vboxNetFltRelease(pThis, true /*fBusy*/);
+    VBOXCURVNET_RESTORE();
+    return (0);
+}
+
+static int ng_vboxnetflt_shutdown(node_p node)
+{
+    PVBOXNETFLTINS pThis = NG_NODE_PRIVATE(node);
+    bool fActive;
+
+    /* Prevent node shutdown if we're active */
+    if (pThis->enmTrunkState == INTNETTRUNKIFSTATE_ACTIVE)
+        return (EBUSY);
+    NG_NODE_UNREF(node);
+    return (0);
+}
+
+static int ng_vboxnetflt_disconnect(hook_p hook)
+{
+    return (0);
+}
+
+/**
+ * Input processing task, handles incoming frames
+ */
+static void vboxNetFltFreeBSDinput(void *arg, int pending)
+{
+    PVBOXNETFLTINS pThis = (PVBOXNETFLTINS)arg;
+    struct mbuf *m, *m0;
+    struct ifnet *ifp = pThis->u.s.ifp;
+    unsigned int cSegs = 0;
+    bool fDropIt = false, fActive;
+    PINTNETSG pSG;
+
+    VBOXCURVNET_SET(ifp->if_vnet);
+    vboxNetFltRetain(pThis, true /* fBusy */);
+    for (;;)
+    {
+        mtx_lock_spin(&pThis->u.s.inq.ifq_mtx);
+        _IF_DEQUEUE(&pThis->u.s.inq, m);
+        mtx_unlock_spin(&pThis->u.s.inq.ifq_mtx);
+        if (m == NULL)
+            break;
+
+        for (m0 = m; m0 != NULL; m0 = m0->m_next)
+            if (m0->m_len > 0)
+                cSegs++;
+
+#ifdef PADD_RUNT_FRAMES_FROM_HOST
+        if (m_length(m, NULL) < 60)
+            cSegs++;
+#endif
+
+        /* Create a copy and deliver to the virtual switch */
+        pSG = RTMemTmpAlloc(RT_UOFFSETOF_DYN(INTNETSG, aSegs[cSegs]));
+        vboxNetFltFreeBSDMBufToSG(pThis, m, pSG, cSegs, 0);
+        fDropIt = pThis->pSwitchPort->pfnRecv(pThis->pSwitchPort, NULL /* pvIf */, pSG, INTNETTRUNKDIR_WIRE);
+        RTMemTmpFree(pSG);
+        if (fDropIt)
+            m_freem(m);
+        else
+            ether_demux(ifp, m);
+    }
+    vboxNetFltRelease(pThis, true /* fBusy */);
+    VBOXCURVNET_RESTORE();
+}
+
+/**
+ * Output processing task, handles outgoing frames
+ */
+static void vboxNetFltFreeBSDoutput(void *arg, int pending)
+{
+    PVBOXNETFLTINS pThis = (PVBOXNETFLTINS)arg;
+    struct mbuf *m, *m0;
+    struct ifnet *ifp = pThis->u.s.ifp;
+    unsigned int cSegs = 0;
+    bool fDropIt = false, fActive;
+    PINTNETSG pSG;
+
+    VBOXCURVNET_SET(ifp->if_vnet);
+    vboxNetFltRetain(pThis, true /* fBusy */);
+    for (;;)
+    {
+        mtx_lock_spin(&pThis->u.s.outq.ifq_mtx);
+        _IF_DEQUEUE(&pThis->u.s.outq, m);
+        mtx_unlock_spin(&pThis->u.s.outq.ifq_mtx);
+        if (m == NULL)
+            break;
+
+        for (m0 = m; m0 != NULL; m0 = m0->m_next)
+            if (m0->m_len > 0)
+                cSegs++;
+
+#ifdef PADD_RUNT_FRAMES_FROM_HOST
+        if (m_length(m, NULL) < 60)
+            cSegs++;
+#endif
+        /* Create a copy and deliver to the virtual switch */
+        pSG = RTMemTmpAlloc(RT_UOFFSETOF_DYN(INTNETSG, aSegs[cSegs]));
+        vboxNetFltFreeBSDMBufToSG(pThis, m, pSG, cSegs, 0);
+        fDropIt = pThis->pSwitchPort->pfnRecv(pThis->pSwitchPort, NULL /* pvIf */, pSG, INTNETTRUNKDIR_HOST);
+        RTMemTmpFree(pSG);
+
+        if (fDropIt)
+            m_freem(m);
+        else
+            ether_output_frame(ifp, m);
+    }
+    vboxNetFltRelease(pThis, true /* fBusy */);
+    VBOXCURVNET_RESTORE();
+}
+
+/**
+ * Called to deliver a frame to either the host, the wire or both.
+ */
+int vboxNetFltPortOsXmit(PVBOXNETFLTINS pThis, void *pvIfData, PINTNETSG pSG, uint32_t fDst)
+{
+    NOREF(pvIfData);
+
+    void (*input_f)(struct ifnet *, struct mbuf *);
+    struct ifnet *ifp;
+    struct mbuf *m;
+    struct m_tag *mtag;
+    bool fActive;
+    int error;
+
+    ifp = ASMAtomicUoReadPtrT(&pThis->u.s.ifp, struct ifnet *);
+    VBOXCURVNET_SET(ifp->if_vnet);
+
+    if (fDst & INTNETTRUNKDIR_WIRE)
+    {
+        m = vboxNetFltFreeBSDSGMBufFromSG(pThis, pSG);
+        if (m == NULL)
+            return VERR_NO_MEMORY;
+        m = m_pullup(m, ETHER_HDR_LEN);
+        if (m == NULL)
+            return VERR_NO_MEMORY;
+
+        m->m_flags |= M_PKTHDR;
+        ether_output_frame(ifp, m);
+    }
+
+    if (fDst & INTNETTRUNKDIR_HOST)
+    {
+        m = vboxNetFltFreeBSDSGMBufFromSG(pThis, pSG);
+        if (m == NULL)
+            return VERR_NO_MEMORY;
+        m = m_pullup(m, ETHER_HDR_LEN);
+        if (m == NULL)
+            return VERR_NO_MEMORY;
+        /*
+         * Delivering packets to the host will be captured by the
+         * input hook. Tag the packet with a mbuf tag so that we
+         * can skip re-delivery of the packet to the guest during
+         * input hook processing.
+         */
+        mtag = m_tag_alloc(MTAG_VBOX, PACKET_TAG_VBOX, 0, M_NOWAIT);
+        if (mtag == NULL)
+        {
+            m_freem(m);
+            return VERR_NO_MEMORY;
+        }
+
+        m_tag_init(m);
+        m_tag_prepend(m, mtag);
+        m->m_flags |= M_PKTHDR;
+        m->m_pkthdr.rcvif = ifp;
+        ifp->if_input(ifp, m);
+    }
+    VBOXCURVNET_RESTORE();
+    return VINF_SUCCESS;
+}
+
+static bool vboxNetFltFreeBsdIsPromiscuous(PVBOXNETFLTINS pThis)
+{
+    /** @todo This isn't taking into account that we put the interface in
+     *        promiscuous mode.  */
+    return (pThis->u.s.flags & IFF_PROMISC) ? true : false;
+}
+
+int vboxNetFltOsInitInstance(PVBOXNETFLTINS pThis, void *pvContext)
+{
+    char nam[NG_NODESIZ];
+    struct ifnet *ifp;
+    node_p node;
+
+    VBOXCURVNET_SET_FROM_UCRED();
+    NOREF(pvContext);
+    ifp = ifunit(pThis->szName);
+    if (ifp == NULL)
+        return VERR_INTNET_FLT_IF_NOT_FOUND;
+
+    /* Create a new netgraph node for this instance */
+    if (ng_make_node_common(&ng_vboxnetflt_typestruct, &node) != 0)
+        return VERR_INTERNAL_ERROR;
+
+    RTSpinlockAcquire(pThis->hSpinlock);
+
+    ASMAtomicUoWritePtr(&pThis->u.s.ifp, ifp);
+    pThis->u.s.node = node;
+    bcopy(IF_LLADDR(ifp), &pThis->u.s.MacAddr, ETHER_ADDR_LEN);
+    ASMAtomicUoWriteBool(&pThis->fDisconnectedFromHost, false);
+
+    /* Initialize deferred input queue */
+    bzero(&pThis->u.s.inq, sizeof(struct ifqueue));
+    mtx_init(&pThis->u.s.inq.ifq_mtx, "vboxnetflt inq", NULL, MTX_SPIN);
+    TASK_INIT(&pThis->u.s.tskin, 0, vboxNetFltFreeBSDinput, pThis);
+
+    /* Initialize deferred output queue */
+    bzero(&pThis->u.s.outq, sizeof(struct ifqueue));
+    mtx_init(&pThis->u.s.outq.ifq_mtx, "vboxnetflt outq", NULL, MTX_SPIN);
+    TASK_INIT(&pThis->u.s.tskout, 0, vboxNetFltFreeBSDoutput, pThis);
+
+    RTSpinlockRelease(pThis->hSpinlock);
+
+    NG_NODE_SET_PRIVATE(node, pThis);
+
+    /* Attempt to name it vboxnetflt_<ifname> */
+    snprintf(nam, NG_NODESIZ, "vboxnetflt_%s", pThis->szName);
+    ng_name_node(node, nam);
+
+    /* Report MAC address, promiscuous mode and GSO capabilities. */
+    /** @todo keep these reports up to date, either by polling for changes or
+     *        intercept some control flow if possible. */
+    if (vboxNetFltTryRetainBusyNotDisconnected(pThis))
+    {
+        Assert(pThis->pSwitchPort);
+        pThis->pSwitchPort->pfnReportMacAddress(pThis->pSwitchPort, &pThis->u.s.MacAddr);
+        pThis->pSwitchPort->pfnReportPromiscuousMode(pThis->pSwitchPort, vboxNetFltFreeBsdIsPromiscuous(pThis));
+        pThis->pSwitchPort->pfnReportGsoCapabilities(pThis->pSwitchPort, 0, INTNETTRUNKDIR_WIRE | INTNETTRUNKDIR_HOST);
+        pThis->pSwitchPort->pfnReportNoPreemptDsts(pThis->pSwitchPort, 0 /* none */);
+        vboxNetFltRelease(pThis, true /*fBusy*/);
+    }
+    VBOXCURVNET_RESTORE();
+
+    return VINF_SUCCESS;
+}
+
+bool vboxNetFltOsMaybeRediscovered(PVBOXNETFLTINS pThis)
+{
+    struct ifnet *ifp, *ifp0;
+
+    ifp = ASMAtomicUoReadPtrT(&pThis->u.s.ifp, struct ifnet *);
+    VBOXCURVNET_SET(ifp->if_vnet);
+    /*
+     * Attempt to check if the interface is still there and re-initialize if
+     * something has changed.
+     */
+    ifp0 = ifunit(pThis->szName);
+    if (ifp != ifp0)
+    {
+        ASMAtomicUoWriteBool(&pThis->fDisconnectedFromHost, true);
+        ng_rmnode_self(pThis->u.s.node);
+        pThis->u.s.node = NULL;
+    }
+    VBOXCURVNET_RESTORE();
+
+    if (ifp0 != NULL)
+    {
+        vboxNetFltOsDeleteInstance(pThis);
+        vboxNetFltOsInitInstance(pThis, NULL);
+    }
+
+    return !ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost);
+}
+
+void vboxNetFltOsDeleteInstance(PVBOXNETFLTINS pThis)
+{
+
+    taskqueue_drain(taskqueue_fast, &pThis->u.s.tskin);
+    taskqueue_drain(taskqueue_fast, &pThis->u.s.tskout);
+
+    mtx_destroy(&pThis->u.s.inq.ifq_mtx);
+    mtx_destroy(&pThis->u.s.outq.ifq_mtx);
+
+    VBOXCURVNET_SET_FROM_UCRED();
+    if (pThis->u.s.node != NULL)
+        ng_rmnode_self(pThis->u.s.node);
+    VBOXCURVNET_RESTORE();
+    pThis->u.s.node = NULL;
+}
+
+int vboxNetFltOsPreInitInstance(PVBOXNETFLTINS pThis)
+{
+
+    pThis->u.s.ifp = NULL;
+    pThis->u.s.flags = 0;
+    pThis->u.s.node = NULL;
+    return VINF_SUCCESS;
+}
+
+void vboxNetFltPortOsSetActive(PVBOXNETFLTINS pThis, bool fActive)
+{
+    struct ifnet *ifp;
+    struct ifreq ifreq;
+    int error;
+    node_p node;
+    struct ng_mesg *msg;
+    struct ngm_connect *con;
+    struct ngm_rmhook *rm;
+    char path[NG_PATHSIZ];
+
+    Log(("%s: fActive:%d\n", __func__, fActive));
+
+    ifp = ASMAtomicUoReadPtrT(&pThis->u.s.ifp, struct ifnet *);
+    VBOXCURVNET_SET(ifp->if_vnet);
+    node = ASMAtomicUoReadPtrT(&pThis->u.s.node, node_p);
+
+    memset(&ifreq, 0, sizeof(struct ifreq));
+    /* Activate interface */
+    if (fActive)
+    {
+        pThis->u.s.flags = ifp->if_flags;
+        ifpromisc(ifp, 1);
+
+        /* ng_ether nodes are named after the interface name */
+        snprintf(path, sizeof(path), "%s:", ifp->if_xname);
+
+        /*
+         * Send a netgraph connect message to the ng_ether node
+         * assigned to the bridged interface. Connecting
+         * the hooks 'lower' (ng_ether) to out 'input'.
+         */
+        NG_MKMESSAGE(msg, NGM_GENERIC_COOKIE, NGM_CONNECT,
+            sizeof(struct ngm_connect), M_NOWAIT);
+        if (msg == NULL)
+            return;
+        con = (struct ngm_connect *)msg->data;
+        snprintf(con->path, NG_PATHSIZ, "vboxnetflt_%s:", ifp->if_xname);
+        strlcpy(con->ourhook, "lower", NG_HOOKSIZ);
+        strlcpy(con->peerhook, "input", NG_HOOKSIZ);
+        NG_SEND_MSG_PATH(error, node, msg, path, 0);
+
+        /*
+         * Do the same for the hooks 'upper' (ng_ether) and our
+         * 'output' hook.
+         */
+        NG_MKMESSAGE(msg, NGM_GENERIC_COOKIE, NGM_CONNECT,
+            sizeof(struct ngm_connect), M_NOWAIT);
+        if (msg == NULL)
+            return;
+        con = (struct ngm_connect *)msg->data;
+        snprintf(con->path, NG_PATHSIZ, "vboxnetflt_%s:",
+            ifp->if_xname);
+        strlcpy(con->ourhook, "upper", sizeof(con->ourhook));
+        strlcpy(con->peerhook, "output", sizeof(con->peerhook));
+        NG_SEND_MSG_PATH(error, node, msg, path, 0);
+    }
+    else
+    {
+        /* De-activate interface */
+        pThis->u.s.flags = 0;
+        ifpromisc(ifp, 0);
+
+        /* Disconnect msgs are addressed to ourself */
+        snprintf(path, sizeof(path), "vboxnetflt_%s:", ifp->if_xname);
+
+        /*
+         * Send a netgraph message to disconnect our 'input' hook
+         */
+        NG_MKMESSAGE(msg, NGM_GENERIC_COOKIE, NGM_RMHOOK,
+            sizeof(struct ngm_rmhook), M_NOWAIT);
+        if (msg == NULL)
+            return;
+        rm = (struct ngm_rmhook *)msg->data;
+        strlcpy(rm->ourhook, "input", NG_HOOKSIZ);
+        NG_SEND_MSG_PATH(error, node, msg, path, 0);
+
+        /*
+         * Send a netgraph message to disconnect our 'output' hook
+         */
+        NG_MKMESSAGE(msg, NGM_GENERIC_COOKIE, NGM_RMHOOK,
+            sizeof(struct ngm_rmhook), M_NOWAIT);
+        if (msg == NULL)
+            return;
+        rm = (struct ngm_rmhook *)msg->data;
+        strlcpy(rm->ourhook, "output", NG_HOOKSIZ);
+        NG_SEND_MSG_PATH(error, node, msg, path, 0);
+    }
+    VBOXCURVNET_RESTORE();
+}
+
+int vboxNetFltOsDisconnectIt(PVBOXNETFLTINS pThis)
+{
+    return VINF_SUCCESS;
+}
+
+int vboxNetFltOsConnectIt(PVBOXNETFLTINS pThis)
+{
+    return VINF_SUCCESS;
+}
+
+void vboxNetFltPortOsNotifyMacAddress(PVBOXNETFLTINS pThis, void *pvIfData, PCRTMAC pMac)
+{
+    NOREF(pThis); NOREF(pvIfData); NOREF(pMac);
+}
+
+int vboxNetFltPortOsConnectInterface(PVBOXNETFLTINS pThis, void *pvIf, void **ppvIfData)
+{
+    /* Nothing to do */
+    NOREF(pThis); NOREF(pvIf); NOREF(ppvIfData);
+    return VINF_SUCCESS;
+}
+
+int vboxNetFltPortOsDisconnectInterface(PVBOXNETFLTINS pThis, void *pvIfData)
+{
+    /* Nothing to do */
+    NOREF(pThis); NOREF(pvIfData);
+    return VINF_SUCCESS;
+}
+
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/freebsd/files_vboxnetflt b/src/VBox/HostDrivers/VBoxNetFlt/freebsd/files_vboxnetflt
new file mode 100755
index 00000000..7aa29028
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/freebsd/files_vboxnetflt
@@ -0,0 +1,88 @@
+#!/bin/sh
+# $Id: files_vboxnetflt $
+## @file
+# Shared file between Makefile.kmk and export_modules.sh.
+#
+
+#
+# Copyright (C) 2007-2020 Oracle Corporation
+#
+# This file is part of VirtualBox Open Source Edition (OSE), as
+# available from http://www.virtualbox.org. This file is free software;
+# you can redistribute it and/or modify it under the terms of the GNU
+# General Public License (GPL) as published by the Free Software
+# Foundation, in version 2 as it comes in the "COPYING" file of the
+# VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+# hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+#
+# The contents of this file may alternatively be used under the terms
+# of the Common Development and Distribution License Version 1.0
+# (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+# VirtualBox OSE distribution, in which case the provisions of the
+# CDDL are applicable instead of those of the GPL.
+#
+# You may elect to license modified versions of this file under the
+# terms and conditions of either the GPL or the CDDL or both.
+#
+
+VBOX_VBOXNETFLT_SOURCES=" \
+    ${PATH_ROOT}/include/iprt/alloc.h=>include/iprt/alloc.h \
+    ${PATH_ROOT}/include/iprt/alloca.h=>include/iprt/alloca.h \
+    ${PATH_ROOT}/include/iprt/asm.h=>include/iprt/asm.h \
+    ${PATH_ROOT}/include/iprt/asm-amd64-x86.h=>include/iprt/asm-amd64-x86.h \
+    ${PATH_ROOT}/include/iprt/asm-math.h=>include/iprt/asm-math.h \
+    ${PATH_ROOT}/include/iprt/assert.h=>include/iprt/assert.h \
+    ${PATH_ROOT}/include/iprt/assertcompile.h=>include/iprt/assertcompile.h \
+    ${PATH_ROOT}/include/iprt/avl.h=>include/iprt/avl.h \
+    ${PATH_ROOT}/include/iprt/cdefs.h=>include/iprt/cdefs.h \
+    ${PATH_ROOT}/include/iprt/cpuset.h=>include/iprt/cpuset.h \
+    ${PATH_ROOT}/include/iprt/ctype.h=>include/iprt/ctype.h \
+    ${PATH_ROOT}/include/iprt/err.h=>include/iprt/err.h \
+    ${PATH_ROOT}/include/iprt/errcore.h=>include/iprt/errcore.h \
+    ${PATH_ROOT}/include/iprt/heap.h=>include/iprt/heap.h \
+    ${PATH_ROOT}/include/iprt/initterm.h=>include/iprt/initterm.h \
+    ${PATH_ROOT}/include/iprt/latin1.h=>include/iprt/latin1.h \
+    ${PATH_ROOT}/include/iprt/log.h=>include/iprt/log.h \
+    ${PATH_ROOT}/include/iprt/mangling.h=>include/iprt/mangling.h \
+    ${PATH_ROOT}/include/iprt/mem.h=>include/iprt/mem.h \
+    ${PATH_ROOT}/include/iprt/memobj.h=>include/iprt/memobj.h \
+    ${PATH_ROOT}/include/iprt/mp.h=>include/iprt/mp.h \
+    ${PATH_ROOT}/include/iprt/param.h=>include/iprt/param.h \
+    ${PATH_ROOT}/include/iprt/power.h=>include/iprt/power.h \
+    ${PATH_ROOT}/include/iprt/process.h=>include/iprt/process.h \
+    ${PATH_ROOT}/include/iprt/semaphore.h=>include/iprt/semaphore.h \
+    ${PATH_ROOT}/include/iprt/spinlock.h=>include/iprt/spinlock.h \
+    ${PATH_ROOT}/include/iprt/stdarg.h=>include/iprt/stdarg.h \
+    ${PATH_ROOT}/include/iprt/stdint.h=>include/iprt/stdint.h \
+    ${PATH_ROOT}/include/iprt/string.h=>include/iprt/string.h \
+    ${PATH_ROOT}/include/iprt/thread.h=>include/iprt/thread.h \
+    ${PATH_ROOT}/include/iprt/time.h=>include/iprt/time.h \
+    ${PATH_ROOT}/include/iprt/timer.h=>include/iprt/timer.h \
+    ${PATH_ROOT}/include/iprt/types.h=>include/iprt/types.h \
+    ${PATH_ROOT}/include/iprt/uni.h=>include/iprt/uni.h \
+    ${PATH_ROOT}/include/iprt/utf16.h=>include/iprt/utf16.h \
+    ${PATH_ROOT}/include/iprt/uuid.h=>include/iprt/uuid.h \
+    ${PATH_ROOT}/include/iprt/nocrt/limits.h=>include/iprt/nocrt/limits.h \
+    ${PATH_ROOT}/include/VBox/cdefs.h=>include/VBox/cdefs.h \
+    ${PATH_ROOT}/include/VBox/err.h=>include/VBox/err.h \
+    ${PATH_ROOT}/include/VBox/log.h=>include/VBox/log.h \
+    ${PATH_ROOT}/include/VBox/intnet.h=>include/VBox/intnet.h \
+    ${PATH_ROOT}/include/VBox/intnetinline.h=>include/VBox/intnetinline.h \
+    ${PATH_ROOT}/include/VBox/vmm/stam.h=>include/VBox/vmm/stam.h \
+    ${PATH_ROOT}/include/VBox/sup.h=>include/VBox/sup.h \
+    ${PATH_ROOT}/include/VBox/types.h=>include/VBox/types.h \
+    ${PATH_ROOT}/include/VBox/version.h=>include/VBox/version.h \
+    ${PATH_ROOT}/include/VBox/SUPDrvMangling.h=>include/VBox/SUPDrvMangling.h \
+    ${PATH_ROOT}/src/VBox/HostDrivers/VBoxNetFlt/freebsd/VBoxNetFlt-freebsd.c=>VBoxNetFlt-freebsd.c \
+    ${PATH_ROOT}/src/VBox/HostDrivers/VBoxNetFlt/VBoxNetFlt.c=>VBoxNetFlt.c \
+    ${PATH_ROOT}/src/VBox/HostDrivers/VBoxNetFlt/VBoxNetFltInternal.h=>VBoxNetFltInternal.h \
+    ${PATH_ROOT}/src/VBox/HostDrivers/Support/SUPDrvIDC.h=>SUPDrvIDC.h \
+    ${PATH_ROOT}/src/VBox/HostDrivers/Support/SUPR0IdcClient.c=>SUPR0IdcClient.c \
+    ${PATH_ROOT}/src/VBox/HostDrivers/Support/SUPR0IdcClientComponent.c=>SUPR0IdcClientComponent.c \
+    ${PATH_ROOT}/src/VBox/HostDrivers/Support/SUPR0IdcClientInternal.h=>SUPR0IdcClientInternal.h \
+    ${PATH_ROOT}/src/VBox/HostDrivers/Support/freebsd/SUPR0IdcClient-freebsd.c=>SUPR0IdcClient-freebsd.c \
+    ${PATH_ROOT}/src/VBox/Runtime/r0drv/freebsd/the-freebsd-kernel.h=>r0drv/freebsd/the-freebsd-kernel.h \
+    ${PATH_OUT}/version-generated.h=>version-generated.h \
+    ${PATH_OUT}/product-generated.h=>product-generated.h \
+"
+
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/linux/Makefile b/src/VBox/HostDrivers/VBoxNetFlt/linux/Makefile
new file mode 100644
index 00000000..d311ba3f
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/linux/Makefile
@@ -0,0 +1,71 @@
+# $Id: Makefile $
+## @file
+# Makefile for the VirtualBox Linux Host Network Filter Driver.
+#
+
+#
+# Copyright (C) 2006-2020 Oracle Corporation
+#
+# This file is part of VirtualBox Open Source Edition (OSE), as
+# available from http://www.virtualbox.org. This file is free software;
+# you can redistribute it and/or modify it under the terms of the GNU
+# General Public License (GPL) as published by the Free Software
+# Foundation, in version 2 as it comes in the "COPYING" file of the
+# VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+# hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+#
+# The contents of this file may alternatively be used under the terms
+# of the Common Development and Distribution License Version 1.0
+# (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+# VirtualBox OSE distribution, in which case the provisions of the
+# CDDL are applicable instead of those of the GPL.
+#
+# You may elect to license modified versions of this file under the
+# terms and conditions of either the GPL or the CDDL or both.
+#
+
+# Linux kbuild sets this to our source directory if we are called from there
+obj ?= $(CURDIR)
+include $(obj)/Makefile-header.gmk
+VBOXNETFLT_DIR := $(VBOX_MODULE_SRC_DIR)
+
+# Allow building directly from the subdirectory without assuming the toplevel
+# makefile has done the copying. Not the default use case, but can be handy.
+ifndef KBUILD_EXTRA_SYMBOLS
+KBUILD_EXTRA_SYMBOLS=$(abspath $(VBOXNETFLT_DIR)/../vboxdrv/Module.symvers)
+endif
+
+VBOXMOD_NAME = vboxnetflt
+VBOXMOD_OBJS = \
+	linux/VBoxNetFlt-linux.o \
+	VBoxNetFlt.o \
+	SUPR0IdcClient.o \
+	SUPR0IdcClientComponent.o \
+	linux/SUPR0IdcClient-linux.o
+ifeq ($(BUILD_TARGET_ARCH),x86)
+VBOXMOD_OBJS += \
+	math/gcc/divdi3.o \
+	math/gcc/moddi3.o \
+	math/gcc/qdivrem.o \
+	math/gcc/udivdi3.o \
+	math/gcc/udivmoddi4.o \
+	math/gcc/divdi3.o \
+	math/gcc/umoddi3.o
+endif
+VBOXMOD_INCL = \
+	$(VBOXNETFLT_DIR) \
+	$(VBOXNETFLT_DIR)include \
+	$(VBOXNETFLT_DIR)r0drv/linux
+VBOXMOD_DEFS = \
+	RT_OS_LINUX \
+	IN_RING0 \
+	IN_RT_R0 \
+	IN_SUP_R0 \
+	VBOX \
+	RT_WITH_VBOX \
+	VBOX_WITH_HARDENING \
+	VBOX_WITH_64_BITS_GUESTS # <-- must be consistent with Config.kmk!
+VBOXMOD_CFLAGS = -include $(VBOXNETFLT_DIR)include/VBox/SUPDrvMangling.h -fno-pie -Wno-declaration-after-statement
+
+include $(obj)/Makefile-footer.gmk
+
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/linux/Makefile.kup b/src/VBox/HostDrivers/VBoxNetFlt/linux/Makefile.kup
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/linux/Makefile.kup
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/linux/VBoxNetFlt-linux.c b/src/VBox/HostDrivers/VBoxNetFlt/linux/VBoxNetFlt-linux.c
new file mode 100644
index 00000000..bc6b5f3b
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/linux/VBoxNetFlt-linux.c
@@ -0,0 +1,2593 @@
+/* $Id: VBoxNetFlt-linux.c $ */
+/** @file
+ * VBoxNetFlt - Network Filter Driver (Host), Linux Specific Code.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP LOG_GROUP_NET_FLT_DRV
+#define VBOXNETFLT_LINUX_NO_XMIT_QUEUE
+#include "the-linux-kernel.h"
+#include "version-generated.h"
+#include "revision-generated.h"
+#include "product-generated.h"
+#if RTLNX_VER_MIN(2,6,24)
+# include <linux/nsproxy.h>
+#endif
+#include <linux/netdevice.h>
+#if RTLNX_VER_MAX(2,6,29) || RTLNX_VER_MIN(5,11,0)
+# include <linux/ethtool.h>
+#endif
+#include <linux/etherdevice.h>
+#include <linux/rtnetlink.h>
+#include <linux/miscdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/if_vlan.h>
+#if RTLNX_VER_MIN(4,5,0)
+# include <uapi/linux/pkt_cls.h>
+#endif
+#include <net/ipv6.h>
+#include <net/if_inet6.h>
+#include <net/addrconf.h>
+
+#include <VBox/log.h>
+#include <VBox/err.h>
+#include <VBox/intnetinline.h>
+#include <VBox/vmm/pdmnetinline.h>
+#include <VBox/param.h>
+#include <iprt/alloca.h>
+#include <iprt/assert.h>
+#include <iprt/spinlock.h>
+#include <iprt/semaphore.h>
+#include <iprt/initterm.h>
+#include <iprt/process.h>
+#include <iprt/mem.h>
+#include <iprt/net.h>
+#include <iprt/log.h>
+#include <iprt/mp.h>
+#include <iprt/mem.h>
+#include <iprt/time.h>
+
+#define VBOXNETFLT_OS_SPECFIC 1
+#include "../VBoxNetFltInternal.h"
+
+typedef struct VBOXNETFLTNOTIFIER {
+    struct notifier_block Notifier;
+    PVBOXNETFLTINS pThis;
+} VBOXNETFLTNOTIFIER;
+typedef struct VBOXNETFLTNOTIFIER *PVBOXNETFLTNOTIFIER;
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+#define VBOX_FLT_NB_TO_INST(pNB)    RT_FROM_MEMBER(pNB, VBOXNETFLTINS, u.s.Notifier)
+#define VBOX_FLT_PT_TO_INST(pPT)    RT_FROM_MEMBER(pPT, VBOXNETFLTINS, u.s.PacketType)
+#ifndef VBOXNETFLT_LINUX_NO_XMIT_QUEUE
+# define VBOX_FLT_XT_TO_INST(pXT)   RT_FROM_MEMBER(pXT, VBOXNETFLTINS, u.s.XmitTask)
+#endif
+
+#if RTLNX_VER_MIN(3,11,0)
+# define VBOX_NETDEV_NOTIFIER_INFO_TO_DEV(ptr) netdev_notifier_info_to_dev(ptr)
+#else
+# define VBOX_NETDEV_NOTIFIER_INFO_TO_DEV(ptr) ((struct net_device *)ptr)
+#endif
+
+#if RTLNX_VER_MIN(3,5,0)
+# define VBOX_SKB_KMAP_FRAG(frag) kmap_atomic(skb_frag_page(frag))
+# define VBOX_SKB_KUNMAP_FRAG(vaddr) kunmap_atomic(vaddr)
+#else
+# if RTLNX_VER_MIN(3,2,0)
+#  define VBOX_SKB_KMAP_FRAG(frag) kmap_atomic(skb_frag_page(frag), KM_SKB_DATA_SOFTIRQ)
+#  define VBOX_SKB_KUNMAP_FRAG(vaddr) kunmap_atomic(vaddr, KM_SKB_DATA_SOFTIRQ)
+# else
+#  define VBOX_SKB_KMAP_FRAG(frag) kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ)
+#  define VBOX_SKB_KUNMAP_FRAG(vaddr) kunmap_atomic(vaddr, KM_SKB_DATA_SOFTIRQ)
+# endif
+#endif
+
+#if RTLNX_VER_MIN(2,6,34)
+# define VBOX_NETDEV_NAME(dev)              netdev_name(dev)
+#else
+# define VBOX_NETDEV_NAME(dev)              ((dev)->reg_state != NETREG_REGISTERED ? "(unregistered net_device)" : (dev)->name)
+#endif
+
+#if RTLNX_VER_MIN(2,6,25)
+# define VBOX_IPV4_IS_LOOPBACK(addr)        ipv4_is_loopback(addr)
+# define VBOX_IPV4_IS_LINKLOCAL_169(addr)   ipv4_is_linklocal_169(addr)
+#else
+# define VBOX_IPV4_IS_LOOPBACK(addr)        ((addr & htonl(IN_CLASSA_NET)) == htonl(0x7f000000))
+# define VBOX_IPV4_IS_LINKLOCAL_169(addr)   ((addr & htonl(IN_CLASSB_NET)) == htonl(0xa9fe0000))
+#endif
+
+#if RTLNX_VER_MIN(2,6,22)
+# define VBOX_SKB_RESET_NETWORK_HDR(skb)    skb_reset_network_header(skb)
+# define VBOX_SKB_RESET_MAC_HDR(skb)        skb_reset_mac_header(skb)
+# define VBOX_SKB_CSUM_OFFSET(skb)          skb->csum_offset
+#else
+# define VBOX_SKB_RESET_NETWORK_HDR(skb)    skb->nh.raw = skb->data
+# define VBOX_SKB_RESET_MAC_HDR(skb)        skb->mac.raw = skb->data
+# define VBOX_SKB_CSUM_OFFSET(skb)          skb->csum
+#endif
+
+#if RTLNX_VER_MIN(2,6,19)
+# define VBOX_SKB_CHECKSUM_HELP(skb)        skb_checksum_help(skb)
+#else
+# define CHECKSUM_PARTIAL                   CHECKSUM_HW
+# if RTLNX_VER_MIN(2,6,10)
+#  define VBOX_SKB_CHECKSUM_HELP(skb)       skb_checksum_help(skb, 0)
+# else
+#  if RTLNX_VER_MIN(2,6,7)
+#   define VBOX_SKB_CHECKSUM_HELP(skb)      skb_checksum_help(&skb, 0)
+#  else
+#   define VBOX_SKB_CHECKSUM_HELP(skb)      (!skb_checksum_help(skb))
+#  endif
+/* Versions prior 2.6.10 use stats for both bstats and qstats */
+#  define bstats stats
+#  define qstats stats
+# endif
+#endif
+
+#if RTLNX_VER_MIN(3,20,0) || RTLNX_RHEL_RANGE(7,2,  8,0) || RTLNX_RHEL_RANGE(6,8,  7,0)
+# define VBOX_HAVE_SKB_VLAN
+#endif
+
+#ifdef VBOX_HAVE_SKB_VLAN
+# define vlan_tx_tag_get(skb)       skb_vlan_tag_get(skb)
+# define vlan_tx_tag_present(skb)   skb_vlan_tag_present(skb)
+#endif
+
+#ifndef NET_IP_ALIGN
+# define NET_IP_ALIGN 2
+#endif
+
+#if 1
+/** Create scatter / gather segments for fragments. When not used, we will
+ *  linearize the socket buffer before creating the internal networking SG. */
+# define VBOXNETFLT_SG_SUPPORT 1
+#endif
+
+#if RTLNX_VER_MIN(2,6,18)
+
+/** Indicates that the linux kernel may send us GSO frames. */
+# define VBOXNETFLT_WITH_GSO                1
+
+/** This enables or disables the transmitting of GSO frame from the internal
+ *  network and to the host.  */
+# define VBOXNETFLT_WITH_GSO_XMIT_HOST      1
+
+# if 0 /** @todo This is currently disable because it causes performance loss of 5-10%.  */
+/** This enables or disables the transmitting of GSO frame from the internal
+ *  network and to the wire. */
+#  define VBOXNETFLT_WITH_GSO_XMIT_WIRE     1
+# endif
+
+/** This enables or disables the forwarding/flooding of GSO frame from the host
+ *  to the internal network.  */
+# define VBOXNETFLT_WITH_GSO_RECV           1
+
+#endif /* RTLNX_VER_MIN(2,6,18) */
+
+#if RTLNX_VER_MIN(2,6,29)
+/** This enables or disables handling of GSO frames coming from the wire (GRO). */
+# define VBOXNETFLT_WITH_GRO                1
+#endif
+
+/*
+ * GRO support was backported to RHEL 5.4
+ */
+#if RTLNX_RHEL_MAJ_PREREQ(5, 4)
+# define VBOXNETFLT_WITH_GRO                1
+#endif
+
+
+/*********************************************************************************************************************************
+*   Internal Functions                                                                                                           *
+*********************************************************************************************************************************/
+static int      __init VBoxNetFltLinuxInit(void);
+static void     __exit VBoxNetFltLinuxUnload(void);
+static void     vboxNetFltLinuxForwardToIntNet(PVBOXNETFLTINS pThis, struct sk_buff *pBuf);
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+/**
+ * The (common) global data.
+ */
+static VBOXNETFLTGLOBALS g_VBoxNetFltGlobals;
+
+module_init(VBoxNetFltLinuxInit);
+module_exit(VBoxNetFltLinuxUnload);
+
+MODULE_AUTHOR(VBOX_VENDOR);
+MODULE_DESCRIPTION(VBOX_PRODUCT " Network Filter Driver");
+MODULE_LICENSE("GPL");
+#ifdef MODULE_VERSION
+MODULE_VERSION(VBOX_VERSION_STRING " r" RT_XSTR(VBOX_SVN_REV) " (" RT_XSTR(INTNETTRUNKIFPORT_VERSION) ")");
+#endif
+
+
+#if RTLNX_VER_MAX(2,6,12) && defined(LOG_ENABLED)
+unsigned dev_get_flags(const struct net_device *dev)
+{
+    unsigned flags;
+
+    flags = (dev->flags & ~(IFF_PROMISC |
+                            IFF_ALLMULTI |
+                            IFF_RUNNING)) |
+            (dev->gflags & (IFF_PROMISC |
+                            IFF_ALLMULTI));
+
+    if (netif_running(dev) && netif_carrier_ok(dev))
+        flags |= IFF_RUNNING;
+
+    return flags;
+}
+#endif /* RTLNX_VER_MAX(2,6,12) */
+
+
+/**
+ * Initialize module.
+ *
+ * @returns appropriate status code.
+ */
+static int __init VBoxNetFltLinuxInit(void)
+{
+    int rc;
+    /*
+     * Initialize IPRT.
+     */
+    rc = RTR0Init(0);
+    if (RT_SUCCESS(rc))
+    {
+        Log(("VBoxNetFltLinuxInit\n"));
+
+        /*
+         * Initialize the globals and connect to the support driver.
+         *
+         * This will call back vboxNetFltOsOpenSupDrv (and maybe vboxNetFltOsCloseSupDrv)
+         * for establishing the connect to the support driver.
+         */
+        memset(&g_VBoxNetFltGlobals, 0, sizeof(g_VBoxNetFltGlobals));
+        rc = vboxNetFltInitGlobalsAndIdc(&g_VBoxNetFltGlobals);
+        if (RT_SUCCESS(rc))
+        {
+            LogRel(("VBoxNetFlt: Successfully started.\n"));
+            return 0;
+        }
+
+        LogRel(("VBoxNetFlt: failed to initialize device extension (rc=%d)\n", rc));
+        RTR0Term();
+    }
+    else
+        LogRel(("VBoxNetFlt: failed to initialize IPRT (rc=%d)\n", rc));
+
+    memset(&g_VBoxNetFltGlobals, 0, sizeof(g_VBoxNetFltGlobals));
+    return -RTErrConvertToErrno(rc);
+}
+
+
+/**
+ * Unload the module.
+ *
+ * @todo We have to prevent this if we're busy!
+ */
+static void __exit VBoxNetFltLinuxUnload(void)
+{
+    int rc;
+    Log(("VBoxNetFltLinuxUnload\n"));
+    Assert(vboxNetFltCanUnload(&g_VBoxNetFltGlobals));
+
+    /*
+     * Undo the work done during start (in reverse order).
+     */
+    rc = vboxNetFltTryDeleteIdcAndGlobals(&g_VBoxNetFltGlobals);
+    AssertRC(rc); NOREF(rc);
+
+    RTR0Term();
+
+    memset(&g_VBoxNetFltGlobals, 0, sizeof(g_VBoxNetFltGlobals));
+
+    Log(("VBoxNetFltLinuxUnload - done\n"));
+}
+
+
+/**
+ * We filter traffic from the host to the internal network
+ * before it reaches the NIC driver.
+ *
+ * The current code uses a very ugly hack overriding hard_start_xmit
+ * callback in the device structure, but it has been shown to give us a
+ * performance boost of 60-100% though. Eventually we have to find some
+ * less hacky way of getting this job done.
+ */
+#define VBOXNETFLT_WITH_HOST2WIRE_FILTER
+
+#ifdef VBOXNETFLT_WITH_HOST2WIRE_FILTER
+
+# if RTLNX_VER_MAX(2,6,29)
+
+typedef struct ethtool_ops OVR_OPSTYPE;
+# define OVR_OPS  ethtool_ops
+# define OVR_XMIT pfnStartXmit
+
+# else /* RTLNX_VER_MIN(2,6,29) */
+
+typedef struct net_device_ops OVR_OPSTYPE;
+# define OVR_OPS  netdev_ops
+# define OVR_XMIT pOrgOps->ndo_start_xmit
+
+# endif /* RTLNX_VER_MIN(2,6,29) */
+
+/**
+ * The overridden net_device_ops of the device we're attached to.
+ *
+ * As there is no net_device_ops structure in pre-2.6.29 kernels we override
+ * ethtool_ops instead along with hard_start_xmit callback in net_device
+ * structure.
+ *
+ * This is a very dirty hack that was created to explore how much we can improve
+ * the host to guest transfers by not CC'ing the NIC. It turns out to be
+ * the only way to filter outgoing packets for devices without TX queue.
+ */
+typedef struct VBoxNetDeviceOpsOverride
+{
+    /** Our overridden ops. */
+    OVR_OPSTYPE                     Ops;
+    /** Magic word. */
+    uint32_t                        u32Magic;
+    /** Pointer to the original ops. */
+    OVR_OPSTYPE const              *pOrgOps;
+# if RTLNX_VER_MAX(2,6,29)
+    /** Pointer to the original hard_start_xmit function. */
+    int (*pfnStartXmit)(struct sk_buff *pSkb, struct net_device *pDev);
+# endif /* RTLNX_VER_MAX(2,6,29) */
+    /** Pointer to the net filter instance. */
+    PVBOXNETFLTINS                  pVBoxNetFlt;
+    /** The number of filtered packages. */
+    uint64_t                        cFiltered;
+    /** The total number of packets */
+    uint64_t                        cTotal;
+} VBOXNETDEVICEOPSOVERRIDE, *PVBOXNETDEVICEOPSOVERRIDE;
+/** VBOXNETDEVICEOPSOVERRIDE::u32Magic value. */
+#define VBOXNETDEVICEOPSOVERRIDE_MAGIC  UINT32_C(0x00c0ffee)
+
+/**
+ * ndo_start_xmit wrapper that drops packets that shouldn't go to the wire
+ * because they belong on the internal network.
+ *
+ * @returns NETDEV_TX_XXX.
+ * @param   pSkb                The socket buffer to transmit.
+ * @param   pDev                The net device.
+ */
+static int vboxNetFltLinuxStartXmitFilter(struct sk_buff *pSkb, struct net_device *pDev)
+{
+    PVBOXNETDEVICEOPSOVERRIDE   pOverride = (PVBOXNETDEVICEOPSOVERRIDE)pDev->OVR_OPS;
+    uint8_t                     abHdrBuf[sizeof(RTNETETHERHDR) + sizeof(uint32_t) + RTNETIPV4_MIN_LEN];
+    PCRTNETETHERHDR             pEtherHdr;
+    PINTNETTRUNKSWPORT          pSwitchPort;
+    uint32_t                    cbHdrs;
+
+
+    /*
+     * Validate the override structure.
+     *
+     * Note! We're racing vboxNetFltLinuxUnhookDev here.  If this was supposed
+     *       to be production quality code, we would have to be much more
+     *       careful here and avoid the race.
+     */
+    if (   !VALID_PTR(pOverride)
+        || pOverride->u32Magic != VBOXNETDEVICEOPSOVERRIDE_MAGIC
+# if RTLNX_VER_MIN(2,6,29)
+        || !VALID_PTR(pOverride->pOrgOps)
+# endif /* RTLNX_VER_MIN(2,6,29) */
+        )
+    {
+        printk("vboxNetFltLinuxStartXmitFilter: bad override %p\n", pOverride);
+        dev_kfree_skb(pSkb);
+        return NETDEV_TX_OK;
+    }
+    pOverride->cTotal++;
+
+    /*
+     * Do the filtering base on the default OUI of our virtual NICs
+     *
+     * Note! In a real solution, we would ask the switch whether the
+     *       destination MAC is 100% to be on the internal network and then
+     *       drop it.
+     */
+    cbHdrs = skb_headlen(pSkb);
+    cbHdrs = RT_MIN(cbHdrs, sizeof(abHdrBuf));
+    pEtherHdr = (PCRTNETETHERHDR)skb_header_pointer(pSkb, 0, cbHdrs, &abHdrBuf[0]);
+    if (   pEtherHdr
+        && VALID_PTR(pOverride->pVBoxNetFlt)
+        && (pSwitchPort = pOverride->pVBoxNetFlt->pSwitchPort) != NULL
+        && VALID_PTR(pSwitchPort)
+        && cbHdrs >= 6)
+    {
+        INTNETSWDECISION enmDecision;
+
+        /** @todo consider reference counting, etc. */
+        enmDecision = pSwitchPort->pfnPreRecv(pSwitchPort, pEtherHdr, cbHdrs, INTNETTRUNKDIR_HOST);
+        if (enmDecision == INTNETSWDECISION_INTNET)
+        {
+            dev_kfree_skb(pSkb);
+            pOverride->cFiltered++;
+            return NETDEV_TX_OK;
+        }
+    }
+
+    return pOverride->OVR_XMIT(pSkb, pDev);
+}
+
+/**
+ * Hooks the device ndo_start_xmit operation of the device.
+ *
+ * @param   pThis               The net filter instance.
+ * @param   pDev                The net device.
+ */
+static void vboxNetFltLinuxHookDev(PVBOXNETFLTINS pThis, struct net_device *pDev)
+{
+    PVBOXNETDEVICEOPSOVERRIDE   pOverride;
+
+    /* Cancel override if ethtool_ops is missing (host-only case, @bugref{5712}) */
+    if (!VALID_PTR(pDev->OVR_OPS))
+        return;
+    pOverride = RTMemAlloc(sizeof(*pOverride));
+    if (!pOverride)
+        return;
+    pOverride->pOrgOps              = pDev->OVR_OPS;
+    pOverride->Ops                  = *pDev->OVR_OPS;
+# if RTLNX_VER_MAX(2,6,29)
+    pOverride->pfnStartXmit         = pDev->hard_start_xmit;
+# else /* RTLNX_VER_MIN(2,6,29) */
+    pOverride->Ops.ndo_start_xmit   = vboxNetFltLinuxStartXmitFilter;
+# endif /* RTLNX_VER_MIN(2,6,29) */
+    pOverride->u32Magic             = VBOXNETDEVICEOPSOVERRIDE_MAGIC;
+    pOverride->cTotal               = 0;
+    pOverride->cFiltered            = 0;
+    pOverride->pVBoxNetFlt          = pThis;
+
+    RTSpinlockAcquire(pThis->hSpinlock); /* (this isn't necessary, but so what) */
+    ASMAtomicWritePtr((void * volatile *)&pDev->OVR_OPS, pOverride);
+# if RTLNX_VER_MAX(2,6,29)
+    ASMAtomicXchgPtr((void * volatile *)&pDev->hard_start_xmit, vboxNetFltLinuxStartXmitFilter);
+# endif /* RTLNX_VER_MAX(2,6,29) */
+    RTSpinlockRelease(pThis->hSpinlock);
+}
+
+/**
+ * Undos what vboxNetFltLinuxHookDev did.
+ *
+ * @param   pThis               The net filter instance.
+ * @param   pDev                The net device.  Can be NULL, in which case
+ *                              we'll try retrieve it from @a pThis.
+ */
+static void vboxNetFltLinuxUnhookDev(PVBOXNETFLTINS pThis, struct net_device *pDev)
+{
+    PVBOXNETDEVICEOPSOVERRIDE   pOverride;
+
+    RTSpinlockAcquire(pThis->hSpinlock);
+    if (!pDev)
+        pDev = ASMAtomicUoReadPtrT(&pThis->u.s.pDev, struct net_device *);
+    if (VALID_PTR(pDev))
+    {
+        pOverride = (PVBOXNETDEVICEOPSOVERRIDE)pDev->OVR_OPS;
+        if (    VALID_PTR(pOverride)
+            &&  pOverride->u32Magic == VBOXNETDEVICEOPSOVERRIDE_MAGIC
+            &&  VALID_PTR(pOverride->pOrgOps)
+           )
+        {
+# if RTLNX_VER_MAX(2,6,29)
+            ASMAtomicWritePtr((void * volatile *)&pDev->hard_start_xmit, pOverride->pfnStartXmit);
+# endif /* RTLNX_VER_MAX(2,6,29) */
+            ASMAtomicWritePtr((void const * volatile *)&pDev->OVR_OPS, pOverride->pOrgOps);
+            ASMAtomicWriteU32(&pOverride->u32Magic, 0);
+        }
+        else
+            pOverride = NULL;
+    }
+    else
+        pOverride = NULL;
+    RTSpinlockRelease(pThis->hSpinlock);
+
+    if (pOverride)
+    {
+        printk("vboxnetflt: %llu out of %llu packets were not sent (directed to host)\n", pOverride->cFiltered, pOverride->cTotal);
+        RTMemFree(pOverride);
+    }
+}
+
+#endif /* VBOXNETFLT_WITH_HOST2WIRE_FILTER */
+
+
+/**
+ * Reads and retains the host interface handle.
+ *
+ * @returns The handle, NULL if detached.
+ * @param   pThis
+ */
+DECLINLINE(struct net_device *) vboxNetFltLinuxRetainNetDev(PVBOXNETFLTINS pThis)
+{
+#if 0
+    struct net_device *pDev = NULL;
+
+    Log(("vboxNetFltLinuxRetainNetDev\n"));
+    /*
+     * Be careful here to avoid problems racing the detached callback.
+     */
+    RTSpinlockAcquire(pThis->hSpinlock);
+    if (!ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost))
+    {
+        pDev = (struct net_device *)ASMAtomicUoReadPtr((void * volatile *)&pThis->u.s.pDev);
+        if (pDev)
+        {
+            dev_hold(pDev);
+            Log(("vboxNetFltLinuxRetainNetDev: Device %p(%s) retained. ref=%d\n",
+                 pDev, pDev->name,
+#if RTLNX_VER_MIN(2,6,37)
+                 netdev_refcnt_read(pDev)
+#else
+                 atomic_read(&pDev->refcnt)
+#endif
+                 ));
+        }
+    }
+    RTSpinlockRelease(pThis->hSpinlock);
+
+    Log(("vboxNetFltLinuxRetainNetDev - done\n"));
+    return pDev;
+#else
+    return ASMAtomicUoReadPtrT(&pThis->u.s.pDev, struct net_device *);
+#endif
+}
+
+
+/**
+ * Release the host interface handle previously retained
+ * by vboxNetFltLinuxRetainNetDev.
+ *
+ * @param   pThis           The instance.
+ * @param   pDev            The vboxNetFltLinuxRetainNetDev
+ *                          return value, NULL is fine.
+ */
+DECLINLINE(void) vboxNetFltLinuxReleaseNetDev(PVBOXNETFLTINS pThis, struct net_device *pDev)
+{
+#if 0
+    Log(("vboxNetFltLinuxReleaseNetDev\n"));
+    NOREF(pThis);
+    if (pDev)
+    {
+        dev_put(pDev);
+        Log(("vboxNetFltLinuxReleaseNetDev: Device %p(%s) released. ref=%d\n",
+             pDev, pDev->name,
+#if RTLNX_VER_MIN(2,6,37)
+             netdev_refcnt_read(pDev)
+#else
+             atomic_read(&pDev->refcnt)
+#endif
+             ));
+    }
+    Log(("vboxNetFltLinuxReleaseNetDev - done\n"));
+#endif
+}
+
+#define VBOXNETFLT_CB_TAG(skb) (0xA1C90000 | (skb->dev->ifindex & 0xFFFF))
+#define VBOXNETFLT_SKB_TAG(skb) (*(uint32_t*)&((skb)->cb[sizeof((skb)->cb)-sizeof(uint32_t)]))
+
+/**
+ * Checks whether this is an mbuf created by vboxNetFltLinuxMBufFromSG,
+ * i.e. a buffer which we're pushing and should be ignored by the filter callbacks.
+ *
+ * @returns true / false accordingly.
+ * @param   pBuf            The sk_buff.
+ */
+DECLINLINE(bool) vboxNetFltLinuxSkBufIsOur(struct sk_buff *pBuf)
+{
+    return VBOXNETFLT_SKB_TAG(pBuf) == VBOXNETFLT_CB_TAG(pBuf);
+}
+
+
+/**
+ * Checks whether this SG list contains a GSO packet.
+ *
+ * @returns true / false accordingly.
+ * @param   pSG             The (scatter/)gather list.
+ */
+DECLINLINE(bool) vboxNetFltLinuxIsGso(PINTNETSG pSG)
+{
+#if defined(VBOXNETFLT_WITH_GSO_XMIT_WIRE) || defined(VBOXNETFLT_WITH_GSO_XMIT_HOST)
+    return !((PDMNETWORKGSOTYPE)pSG->GsoCtx.u8Type == PDMNETWORKGSOTYPE_INVALID);
+#else /* !VBOXNETFLT_WITH_GSO_XMIT_WIRE && !VBOXNETFLT_WITH_GSO_XMIT_HOST */
+    return false;
+#endif /* !VBOXNETFLT_WITH_GSO_XMIT_WIRE && !VBOXNETFLT_WITH_GSO_XMIT_HOST */
+}
+
+
+/**
+ * Find out the frame size (of a single segment in case of GSO frames).
+ *
+ * @returns the frame size.
+ * @param   pSG             The (scatter/)gather list.
+ */
+DECLINLINE(uint32_t) vboxNetFltLinuxFrameSize(PINTNETSG pSG)
+{
+    uint16_t u16Type = 0;
+    uint32_t cbVlanTag = 0;
+    if (pSG->aSegs[0].cb >= sizeof(RTNETETHERHDR))
+        u16Type = RT_BE2H_U16(((PCRTNETETHERHDR)pSG->aSegs[0].pv)->EtherType);
+    else if (pSG->cbTotal >= sizeof(RTNETETHERHDR))
+    {
+        uint32_t off = RT_UOFFSETOF(RTNETETHERHDR, EtherType);
+        uint32_t i;
+        for (i = 0; i < pSG->cSegsUsed; ++i)
+        {
+            if (off <= pSG->aSegs[i].cb)
+            {
+                if (off + sizeof(uint16_t) <= pSG->aSegs[i].cb)
+                    u16Type = RT_BE2H_U16(*(uint16_t *)((uintptr_t)pSG->aSegs[i].pv + off));
+                else if (i + 1 < pSG->cSegsUsed)
+                    u16Type = RT_BE2H_U16(  ((uint16_t)( ((uint8_t *)pSG->aSegs[i].pv)[off] ) << 8)
+                                          + *(uint8_t *)pSG->aSegs[i + 1].pv); /* ASSUMES no empty segments! */
+                /* else: frame is too short. */
+                break;
+            }
+            off -= pSG->aSegs[i].cb;
+        }
+    }
+    if (u16Type == RTNET_ETHERTYPE_VLAN)
+        cbVlanTag = 4;
+    return (vboxNetFltLinuxIsGso(pSG) ? (uint32_t)pSG->GsoCtx.cbMaxSeg + pSG->GsoCtx.cbHdrsTotal : pSG->cbTotal) - cbVlanTag;
+}
+
+
+/**
+ * Internal worker that create a linux sk_buff for a
+ * (scatter/)gather list.
+ *
+ * @returns Pointer to the sk_buff.
+ * @param   pThis           The instance.
+ * @param   pSG             The (scatter/)gather list.
+ * @param   fDstWire        Set if the destination is the wire.
+ */
+static struct sk_buff *vboxNetFltLinuxSkBufFromSG(PVBOXNETFLTINS pThis, PINTNETSG pSG, bool fDstWire)
+{
+    struct sk_buff *pPkt;
+    struct net_device *pDev;
+#if defined(VBOXNETFLT_WITH_GSO_XMIT_WIRE) || defined(VBOXNETFLT_WITH_GSO_XMIT_HOST)
+    unsigned fGsoType = 0;
+#endif
+
+    if (pSG->cbTotal == 0)
+    {
+        LogRel(("VBoxNetFlt: Dropped empty packet coming from internal network.\n"));
+        return NULL;
+    }
+    Log5(("VBoxNetFlt: Packet to %s of %d bytes (frame=%d).\n", fDstWire?"wire":"host", pSG->cbTotal, vboxNetFltLinuxFrameSize(pSG)));
+    if (fDstWire && (vboxNetFltLinuxFrameSize(pSG) > ASMAtomicReadU32(&pThis->u.s.cbMtu) + 14))
+    {
+        static bool s_fOnce = true;
+        if (s_fOnce)
+        {
+            s_fOnce = false;
+            printk("VBoxNetFlt: Dropped over-sized packet (%d bytes) coming from internal network.\n", vboxNetFltLinuxFrameSize(pSG));
+        }
+        return NULL;
+    }
+
+    /** @todo We should use fragments mapping the SG buffers with large packets.
+     *        256 bytes seems to be the a threshold used a lot for this.  It
+     *        requires some nasty work on the intnet side though...  */
+    /*
+     * Allocate a packet and copy over the data.
+     */
+    pDev = ASMAtomicUoReadPtrT(&pThis->u.s.pDev, struct net_device *);
+    pPkt = dev_alloc_skb(pSG->cbTotal + NET_IP_ALIGN);
+    if (RT_UNLIKELY(!pPkt))
+    {
+        Log(("vboxNetFltLinuxSkBufFromSG: Failed to allocate sk_buff(%u).\n", pSG->cbTotal));
+        pSG->pvUserData = NULL;
+        return NULL;
+    }
+    pPkt->dev       = pDev;
+    pPkt->ip_summed = CHECKSUM_NONE;
+
+    /* Align IP header on 16-byte boundary: 2 + 14 (ethernet hdr size). */
+    skb_reserve(pPkt, NET_IP_ALIGN);
+
+    /* Copy the segments. */
+    skb_put(pPkt, pSG->cbTotal);
+    IntNetSgRead(pSG, pPkt->data);
+
+#if defined(VBOXNETFLT_WITH_GSO_XMIT_WIRE) || defined(VBOXNETFLT_WITH_GSO_XMIT_HOST)
+    /*
+     * Setup GSO if used by this packet.
+     */
+    switch ((PDMNETWORKGSOTYPE)pSG->GsoCtx.u8Type)
+    {
+        default:
+            AssertMsgFailed(("%u (%s)\n", pSG->GsoCtx.u8Type, PDMNetGsoTypeName((PDMNETWORKGSOTYPE)pSG->GsoCtx.u8Type) ));
+            /* fall thru */
+        case PDMNETWORKGSOTYPE_INVALID:
+            fGsoType = 0;
+            break;
+        case PDMNETWORKGSOTYPE_IPV4_TCP:
+            fGsoType = SKB_GSO_TCPV4;
+            break;
+        case PDMNETWORKGSOTYPE_IPV6_TCP:
+            fGsoType = SKB_GSO_TCPV6;
+            break;
+    }
+    if (fGsoType)
+    {
+        struct skb_shared_info *pShInfo = skb_shinfo(pPkt);
+
+        pShInfo->gso_type = fGsoType | SKB_GSO_DODGY;
+        pShInfo->gso_size = pSG->GsoCtx.cbMaxSeg;
+        pShInfo->gso_segs = PDMNetGsoCalcSegmentCount(&pSG->GsoCtx, pSG->cbTotal);
+
+        /*
+         * We need to set checksum fields even if the packet goes to the host
+         * directly as it may be immediately forwarded by IP layer @bugref{5020}.
+         */
+        Assert(skb_headlen(pPkt) >= pSG->GsoCtx.cbHdrsTotal);
+        pPkt->ip_summed  = CHECKSUM_PARTIAL;
+# if RTLNX_VER_MIN(2,6,22)
+        pPkt->csum_start = skb_headroom(pPkt) + pSG->GsoCtx.offHdr2;
+        if (fGsoType & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))
+            pPkt->csum_offset = RT_UOFFSETOF(RTNETTCP, th_sum);
+        else
+            pPkt->csum_offset = RT_UOFFSETOF(RTNETUDP, uh_sum);
+# else
+        pPkt->h.raw = pPkt->data + pSG->GsoCtx.offHdr2;
+        if (fGsoType & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))
+            pPkt->csum = RT_UOFFSETOF(RTNETTCP, th_sum);
+        else
+            pPkt->csum = RT_UOFFSETOF(RTNETUDP, uh_sum);
+# endif
+        if (!fDstWire)
+            PDMNetGsoPrepForDirectUse(&pSG->GsoCtx, pPkt->data, pSG->cbTotal, PDMNETCSUMTYPE_PSEUDO);
+    }
+#endif /* VBOXNETFLT_WITH_GSO_XMIT_WIRE || VBOXNETFLT_WITH_GSO_XMIT_HOST */
+
+    /*
+     * Finish up the socket buffer.
+     */
+    pPkt->protocol = eth_type_trans(pPkt, pDev);
+    if (fDstWire)
+    {
+        VBOX_SKB_RESET_NETWORK_HDR(pPkt);
+
+        /* Restore ethernet header back. */
+        skb_push(pPkt, ETH_HLEN); /** @todo VLAN: +4 if VLAN? */
+        VBOX_SKB_RESET_MAC_HDR(pPkt);
+    }
+    VBOXNETFLT_SKB_TAG(pPkt) = VBOXNETFLT_CB_TAG(pPkt);
+
+    return pPkt;
+}
+
+
+/**
+ * Return the offset where to start checksum computation from.
+ *
+ * @returns the offset relative to pBuf->data.
+ * @param   pBuf                The socket buffer.
+ */
+DECLINLINE(unsigned) vboxNetFltLinuxGetChecksumStartOffset(struct sk_buff *pBuf)
+{
+#if RTLNX_VER_MIN(2,6,38)
+    return skb_checksum_start_offset(pBuf);
+#elif RTLNX_VER_MIN(2,6,22)
+    return pBuf->csum_start - skb_headroom(pBuf);
+#else
+    unsigned char *pTransportHdr = pBuf->h.raw;
+# if RTLNX_VER_MAX(2,6,19)
+    /*
+     * Try to work around the problem with CentOS 4.7 and 5.2 (2.6.9
+     * and 2.6.18 kernels), they pass wrong 'h' pointer down. We take IP
+     * header length from the header itself and reconstruct 'h' pointer
+     * to TCP (or whatever) header.
+     */
+    if (pBuf->h.raw == pBuf->nh.raw && pBuf->protocol == htons(ETH_P_IP))
+        pTransportHdr = pBuf->nh.raw + pBuf->nh.iph->ihl * 4;
+# endif
+    return pTransportHdr - pBuf->data;
+#endif
+}
+
+
+/**
+ * Initializes a SG list from an sk_buff.
+ *
+ * @returns Number of segments.
+ * @param   pThis               The instance.
+ * @param   pBuf                The sk_buff.
+ * @param   pSG                 The SG.
+ * @param   cbExtra             The number of bytes of extra space allocated immediately after the SG.
+ * @param   cSegs               The number of segments allocated for the SG.
+ *                              This should match the number in the mbuf exactly!
+ * @param   fSrc                The source of the frame.
+ * @param   pGsoCtx             Pointer to the GSO context if it's a GSO
+ *                              internal network frame.  NULL if regular frame.
+ */
+static void vboxNetFltLinuxSkBufToSG(PVBOXNETFLTINS pThis, struct sk_buff *pBuf, PINTNETSG pSG,
+                                     unsigned cbExtra, unsigned cSegs, uint32_t fSrc, PCPDMNETWORKGSO pGsoCtx)
+{
+    int i;
+    NOREF(pThis);
+
+#ifndef VBOXNETFLT_SG_SUPPORT
+    Assert(!skb_shinfo(pBuf)->frag_list);
+#else /* VBOXNETFLT_SG_SUPPORT */
+    uint8_t *pExtra = (uint8_t *)&pSG->aSegs[cSegs];
+    unsigned cbConsumed = 0;
+    unsigned cbProduced = 0;
+
+# if RTLNX_VER_MIN(2,6,27)
+    /* Restore VLAN tag stripped by host hardware */
+    if (vlan_tx_tag_present(pBuf))
+    {
+        uint8_t *pMac = pBuf->data;
+        struct vlan_ethhdr *pVHdr = (struct vlan_ethhdr *)pExtra;
+        Assert(ETH_ALEN * 2 + VLAN_HLEN <= cbExtra);
+        memmove(pVHdr, pMac, ETH_ALEN * 2);
+        /* Consume whole Ethernet header: 2 addresses + EtherType (see @bugref{8599}) */
+        cbConsumed += ETH_ALEN * 2 + sizeof(uint16_t);
+        pVHdr->h_vlan_proto = RT_H2N_U16(ETH_P_8021Q);
+        pVHdr->h_vlan_TCI   = RT_H2N_U16(vlan_tx_tag_get(pBuf));
+        pVHdr->h_vlan_encapsulated_proto = *(uint16_t*)(pMac + ETH_ALEN * 2);
+        cbProduced += VLAN_ETH_HLEN;
+    }
+# endif /* RTLNX_VER_MIN(2,6,27) */
+
+    if (pBuf->ip_summed == CHECKSUM_PARTIAL && pBuf->pkt_type == PACKET_OUTGOING)
+    {
+        unsigned uCsumStartOffset = vboxNetFltLinuxGetChecksumStartOffset(pBuf);
+        unsigned uCsumStoreOffset = uCsumStartOffset + VBOX_SKB_CSUM_OFFSET(pBuf) - cbConsumed;
+        Log3(("cbConsumed=%u cbProduced=%u uCsumStartOffset=%u uCsumStoreOffset=%u\n",
+              cbConsumed, cbProduced, uCsumStartOffset, uCsumStoreOffset));
+        Assert(cbProduced + uCsumStoreOffset + sizeof(uint16_t) <= cbExtra);
+        /*
+         * We assume that the checksum is stored at the very end of the transport header
+         * so we will have all headers in a single fragment. If our assumption is wrong
+         * we may see suboptimal performance.
+         */
+        memmove(pExtra + cbProduced,
+                pBuf->data + cbConsumed,
+                uCsumStoreOffset);
+        unsigned uChecksum = skb_checksum(pBuf, uCsumStartOffset, pBuf->len - uCsumStartOffset, 0);
+        *(uint16_t*)(pExtra + cbProduced + uCsumStoreOffset) = csum_fold(uChecksum);
+        cbProduced += uCsumStoreOffset + sizeof(uint16_t);
+        cbConsumed += uCsumStoreOffset + sizeof(uint16_t);
+    }
+#endif /* VBOXNETFLT_SG_SUPPORT */
+
+    if (!pGsoCtx)
+        IntNetSgInitTempSegs(pSG, pBuf->len + cbProduced - cbConsumed, cSegs, 0 /*cSegsUsed*/);
+    else
+        IntNetSgInitTempSegsGso(pSG, pBuf->len + cbProduced - cbConsumed, cSegs, 0 /*cSegsUsed*/, pGsoCtx);
+
+    int iSeg = 0;
+#ifdef VBOXNETFLT_SG_SUPPORT
+    if (cbProduced)
+    {
+        pSG->aSegs[iSeg].cb = cbProduced;
+        pSG->aSegs[iSeg].pv = pExtra;
+        pSG->aSegs[iSeg++].Phys = NIL_RTHCPHYS;
+    }
+    pSG->aSegs[iSeg].cb = skb_headlen(pBuf) - cbConsumed;
+    pSG->aSegs[iSeg].pv = pBuf->data + cbConsumed;
+    pSG->aSegs[iSeg++].Phys = NIL_RTHCPHYS;
+    Assert(iSeg <= pSG->cSegsAlloc);
+
+# ifdef LOG_ENABLED
+    if (pBuf->data_len)
+        Log6(("  kmap_atomic:"));
+# endif /* LOG_ENABLED */
+    for (i = 0; i < skb_shinfo(pBuf)->nr_frags; i++)
+    {
+        skb_frag_t *pFrag = &skb_shinfo(pBuf)->frags[i];
+# if RTLNX_VER_MIN(5,4,0) || RTLNX_SUSE_MAJ_PREREQ(15, 2)
+        pSG->aSegs[iSeg].cb = pFrag->bv_len;
+        pSG->aSegs[iSeg].pv = VBOX_SKB_KMAP_FRAG(pFrag) + pFrag->bv_offset;
+# else /* < KERNEL_VERSION(5, 4, 0) */
+        pSG->aSegs[iSeg].cb = pFrag->size;
+        pSG->aSegs[iSeg].pv = VBOX_SKB_KMAP_FRAG(pFrag) + pFrag->page_offset;
+# endif /* >= KERNEL_VERSION(5, 4, 0) */
+        Log6((" %p", pSG->aSegs[iSeg].pv));
+        pSG->aSegs[iSeg++].Phys = NIL_RTHCPHYS;
+        Assert(iSeg <= pSG->cSegsAlloc);
+    }
+    struct sk_buff *pFragBuf;
+    for (pFragBuf = skb_shinfo(pBuf)->frag_list; pFragBuf; pFragBuf = pFragBuf->next)
+    {
+        pSG->aSegs[iSeg].cb = skb_headlen(pFragBuf);
+        pSG->aSegs[iSeg].pv = pFragBuf->data;
+        pSG->aSegs[iSeg++].Phys = NIL_RTHCPHYS;
+        Assert(iSeg <= pSG->cSegsAlloc);
+        for (i = 0; i < skb_shinfo(pFragBuf)->nr_frags; i++)
+        {
+            skb_frag_t *pFrag = &skb_shinfo(pFragBuf)->frags[i];
+# if RTLNX_VER_MIN(5,4,0) || RTLNX_SUSE_MAJ_PREREQ(15, 2)
+            pSG->aSegs[iSeg].cb = pFrag->bv_len;
+            pSG->aSegs[iSeg].pv = VBOX_SKB_KMAP_FRAG(pFrag) + pFrag->bv_offset;
+# else /* < KERNEL_VERSION(5, 4, 0) */
+            pSG->aSegs[iSeg].cb = pFrag->size;
+            pSG->aSegs[iSeg].pv = VBOX_SKB_KMAP_FRAG(pFrag) + pFrag->page_offset;
+# endif /* >= KERNEL_VERSION(5, 4, 0) */
+            Log6((" %p", pSG->aSegs[iSeg].pv));
+            pSG->aSegs[iSeg++].Phys = NIL_RTHCPHYS;
+            Assert(iSeg <= pSG->cSegsAlloc);
+        }
+    }
+# ifdef LOG_ENABLED
+    if (pBuf->data_len)
+        Log6(("\n"));
+# endif /* LOG_ENABLED */
+#else
+    pSG->aSegs[iSeg].cb = pBuf->len;
+    pSG->aSegs[iSeg].pv = pBuf->data;
+    pSG->aSegs[iSeg++].Phys = NIL_RTHCPHYS;
+#endif
+
+    pSG->cSegsUsed = iSeg;
+
+#if 0
+    if (cbProduced)
+    {
+        LogRel(("vboxNetFltLinuxSkBufToSG: original packet dump:\n%.*Rhxd\n", pBuf->len-pBuf->data_len, skb_mac_header(pBuf)));
+        LogRel(("vboxNetFltLinuxSkBufToSG: cbConsumed=%u cbProduced=%u cbExtra=%u\n", cbConsumed, cbProduced, cbExtra));
+        uint32_t offset = 0;
+        for (i = 0; i < pSG->cSegsUsed; ++i)
+        {
+            LogRel(("vboxNetFltLinuxSkBufToSG: seg#%d (%d bytes, starting at 0x%x):\n%.*Rhxd\n",
+                    i, pSG->aSegs[i].cb, offset, pSG->aSegs[i].cb, pSG->aSegs[i].pv));
+            offset += pSG->aSegs[i].cb;
+        }
+    }
+#endif
+
+#ifdef PADD_RUNT_FRAMES_FROM_HOST
+    /*
+     * Add a trailer if the frame is too small.
+     *
+     * Since we're getting to the packet before it is framed, it has not
+     * yet been padded. The current solution is to add a segment pointing
+     * to a buffer containing all zeros and pray that works for all frames...
+     */
+    if (pSG->cbTotal < 60 && (fSrc & INTNETTRUNKDIR_HOST))
+    {
+        Assert(pBuf->data_len == 0); /* Packets with fragments are never small! */
+        static uint8_t const s_abZero[128] = {0};
+
+        AssertReturnVoid(iSeg < cSegs);
+
+        pSG->aSegs[iSeg].Phys = NIL_RTHCPHYS;
+        pSG->aSegs[iSeg].pv = (void *)&s_abZero[0];
+        pSG->aSegs[iSeg++].cb = 60 - pSG->cbTotal;
+        pSG->cbTotal = 60;
+        pSG->cSegsUsed++;
+        Assert(iSeg <= pSG->cSegsAlloc)
+    }
+#endif
+
+    Log6(("vboxNetFltLinuxSkBufToSG: allocated=%d, segments=%d frags=%d next=%p frag_list=%p pkt_type=%x fSrc=%x\n",
+          pSG->cSegsAlloc, pSG->cSegsUsed, skb_shinfo(pBuf)->nr_frags, pBuf->next, skb_shinfo(pBuf)->frag_list, pBuf->pkt_type, fSrc));
+    for (i = 0; i < pSG->cSegsUsed; i++)
+        Log6(("vboxNetFltLinuxSkBufToSG:   #%d: cb=%d pv=%p\n",
+              i, pSG->aSegs[i].cb, pSG->aSegs[i].pv));
+}
+
+/**
+ * Packet handler; not really documented - figure it out yourself.
+ *
+ * @returns 0 or EJUSTRETURN - this is probably copy & pastry and thus wrong.
+ */
+#if RTLNX_VER_MIN(2,6,14)
+static int vboxNetFltLinuxPacketHandler(struct sk_buff *pBuf,
+                                        struct net_device *pSkbDev,
+                                        struct packet_type *pPacketType,
+                                        struct net_device *pOrigDev)
+#else
+static int vboxNetFltLinuxPacketHandler(struct sk_buff *pBuf,
+                                        struct net_device *pSkbDev,
+                                        struct packet_type *pPacketType)
+#endif
+{
+    PVBOXNETFLTINS pThis;
+    struct net_device *pDev;
+    LogFlow(("vboxNetFltLinuxPacketHandler: pBuf=%p pSkbDev=%p pPacketType=%p\n",
+             pBuf, pSkbDev, pPacketType));
+#if RTLNX_VER_MIN(2,6,18)
+    Log3(("vboxNetFltLinuxPacketHandler: skb len=%u data_len=%u truesize=%u next=%p nr_frags=%u gso_size=%u gso_seqs=%u gso_type=%x frag_list=%p pkt_type=%x\n",
+          pBuf->len, pBuf->data_len, pBuf->truesize, pBuf->next, skb_shinfo(pBuf)->nr_frags, skb_shinfo(pBuf)->gso_size, skb_shinfo(pBuf)->gso_segs, skb_shinfo(pBuf)->gso_type, skb_shinfo(pBuf)->frag_list, pBuf->pkt_type));
+# if RTLNX_VER_MIN(2,6,22)
+    Log6(("vboxNetFltLinuxPacketHandler: packet dump follows:\n%.*Rhxd\n", pBuf->len-pBuf->data_len, skb_mac_header(pBuf)));
+# endif
+#else
+    Log3(("vboxNetFltLinuxPacketHandler: skb len=%u data_len=%u truesize=%u next=%p nr_frags=%u tso_size=%u tso_seqs=%u frag_list=%p pkt_type=%x\n",
+          pBuf->len, pBuf->data_len, pBuf->truesize, pBuf->next, skb_shinfo(pBuf)->nr_frags, skb_shinfo(pBuf)->tso_size, skb_shinfo(pBuf)->tso_segs, skb_shinfo(pBuf)->frag_list, pBuf->pkt_type));
+#endif
+    /*
+     * Drop it immediately?
+     */
+    if (!pBuf)
+        return 0;
+
+    if (pBuf->pkt_type == PACKET_LOOPBACK)
+    {
+        /*
+         * We are not interested in loopbacked packets as they will always have
+         * another copy going to the wire.
+         */
+        Log2(("vboxNetFltLinuxPacketHandler: dropped loopback packet (cb=%u)\n", pBuf->len));
+        dev_kfree_skb(pBuf); /* We must 'consume' all packets we get (@bugref{6539})! */
+        return 0;
+    }
+
+    pThis = VBOX_FLT_PT_TO_INST(pPacketType);
+    pDev = ASMAtomicUoReadPtrT(&pThis->u.s.pDev, struct net_device *);
+    if (pDev != pSkbDev)
+    {
+        Log(("vboxNetFltLinuxPacketHandler: Devices do not match, pThis may be wrong! pThis=%p\n", pThis));
+        kfree_skb(pBuf); /* This is a failure, so we use kfree_skb instead of dev_kfree_skb. */
+        return 0;
+    }
+
+    Log6(("vboxNetFltLinuxPacketHandler: pBuf->cb dump:\n%.*Rhxd\n", sizeof(pBuf->cb), pBuf->cb));
+    if (vboxNetFltLinuxSkBufIsOur(pBuf))
+    {
+        Log2(("vboxNetFltLinuxPacketHandler: got our own sk_buff, drop it.\n"));
+        dev_kfree_skb(pBuf);
+        return 0;
+    }
+
+#ifndef VBOXNETFLT_SG_SUPPORT
+    {
+        /*
+         * Get rid of fragmented packets, they cause too much trouble.
+         */
+        unsigned int uMacLen = pBuf->mac_len;
+        struct sk_buff *pCopy = skb_copy(pBuf, GFP_ATOMIC);
+        dev_kfree_skb(pBuf);
+        if (!pCopy)
+        {
+            LogRel(("VBoxNetFlt: Failed to allocate packet buffer, dropping the packet.\n"));
+            return 0;
+        }
+        pBuf = pCopy;
+        /* Somehow skb_copy ignores mac_len */
+        pBuf->mac_len = uMacLen;
+# if RTLNX_VER_MIN(2,6,27)
+        /* Restore VLAN tag stripped by host hardware */
+        if (vlan_tx_tag_present(pBuf) && skb_headroom(pBuf) >= VLAN_ETH_HLEN)
+        {
+            uint8_t *pMac = (uint8_t*)skb_mac_header(pBuf);
+            struct vlan_ethhdr *pVHdr = (struct vlan_ethhdr *)(pMac - VLAN_HLEN);
+            memmove(pVHdr, pMac, ETH_ALEN * 2);
+            pVHdr->h_vlan_proto = RT_H2N_U16(ETH_P_8021Q);
+            pVHdr->h_vlan_TCI   = RT_H2N_U16(vlan_tx_tag_get(pBuf));
+            pBuf->mac_header   -= VLAN_HLEN;
+            pBuf->mac_len      += VLAN_HLEN;
+        }
+# endif /* RTLNX_VER_MIN(2,6,27) */
+
+# if RTLNX_VER_MIN(2,6,18)
+        Log3(("vboxNetFltLinuxPacketHandler: skb copy len=%u data_len=%u truesize=%u next=%p nr_frags=%u gso_size=%u gso_seqs=%u gso_type=%x frag_list=%p pkt_type=%x\n",
+              pBuf->len, pBuf->data_len, pBuf->truesize, pBuf->next, skb_shinfo(pBuf)->nr_frags, skb_shinfo(pBuf)->gso_size, skb_shinfo(pBuf)->gso_segs, skb_shinfo(pBuf)->gso_type, skb_shinfo(pBuf)->frag_list, pBuf->pkt_type));
+#  if RTLNX_VER_MIN(2,6,22)
+        Log6(("vboxNetFltLinuxPacketHandler: packet dump follows:\n%.*Rhxd\n", pBuf->len-pBuf->data_len, skb_mac_header(pBuf)));
+#  endif /* RTLNX_VER_MIN(2,6,22) */
+# else /* RTLNX_VER_MAX(2,6,18) */
+        Log3(("vboxNetFltLinuxPacketHandler: skb copy len=%u data_len=%u truesize=%u next=%p nr_frags=%u tso_size=%u tso_seqs=%u frag_list=%p pkt_type=%x\n",
+              pBuf->len, pBuf->data_len, pBuf->truesize, pBuf->next, skb_shinfo(pBuf)->nr_frags, skb_shinfo(pBuf)->tso_size, skb_shinfo(pBuf)->tso_segs, skb_shinfo(pBuf)->frag_list, pBuf->pkt_type));
+# endif /* RTLNX_VER_MAX(2,6,18) */
+    }
+#endif /* !VBOXNETFLT_SG_SUPPORT */
+
+#ifdef VBOXNETFLT_LINUX_NO_XMIT_QUEUE
+    /* Forward it to the internal network. */
+    vboxNetFltLinuxForwardToIntNet(pThis, pBuf);
+#else /* !VBOXNETFLT_LINUX_NO_XMIT_QUEUE */
+    /* Add the packet to transmit queue and schedule the bottom half. */
+    skb_queue_tail(&pThis->u.s.XmitQueue, pBuf);
+    schedule_work(&pThis->u.s.XmitTask);
+    Log6(("vboxNetFltLinuxPacketHandler: scheduled work %p for sk_buff %p\n",
+          &pThis->u.s.XmitTask, pBuf));
+#endif /* !VBOXNETFLT_LINUX_NO_XMIT_QUEUE */
+
+    /* It does not really matter what we return, it is ignored by the kernel. */
+    return 0;
+}
+
+/**
+ * Calculate the number of INTNETSEG segments the socket buffer will need.
+ *
+ * @returns Segment count.
+ * @param   pBuf                The socket buffer.
+ * @param   pcbTemp             Where to store the number of bytes of the part
+ *                              of the socket buffer that will be copied to
+ *                              a temporary storage.
+ */
+DECLINLINE(unsigned) vboxNetFltLinuxCalcSGSegments(struct sk_buff *pBuf, unsigned *pcbTemp)
+{
+    *pcbTemp = 0;
+#ifdef VBOXNETFLT_SG_SUPPORT
+    unsigned cSegs = 1 + skb_shinfo(pBuf)->nr_frags;
+    if (pBuf->ip_summed == CHECKSUM_PARTIAL && pBuf->pkt_type == PACKET_OUTGOING)
+    {
+        *pcbTemp = vboxNetFltLinuxGetChecksumStartOffset(pBuf) + VBOX_SKB_CSUM_OFFSET(pBuf) + sizeof(uint16_t);
+    }
+# if RTLNX_VER_MIN(2,6,27)
+    if (vlan_tx_tag_present(pBuf))
+    {
+        if (*pcbTemp)
+            *pcbTemp += VLAN_HLEN;
+        else
+            *pcbTemp = VLAN_ETH_HLEN;
+    }
+# endif /* RTLNX_VER_MIN(2,6,27) */
+    if (*pcbTemp)
+        ++cSegs;
+    struct sk_buff *pFrag;
+    for (pFrag = skb_shinfo(pBuf)->frag_list; pFrag; pFrag = pFrag->next)
+    {
+        Log6(("vboxNetFltLinuxCalcSGSegments: frag=%p len=%d data_len=%d frags=%d frag_list=%p next=%p\n",
+              pFrag, pFrag->len, pFrag->data_len, skb_shinfo(pFrag)->nr_frags, skb_shinfo(pFrag)->frag_list, pFrag->next));
+        cSegs += 1 + skb_shinfo(pFrag)->nr_frags;
+    }
+#else
+    unsigned cSegs = 1;
+#endif
+#ifdef PADD_RUNT_FRAMES_FROM_HOST
+    /* vboxNetFltLinuxSkBufToSG adds a padding segment if it's a runt. */
+    if (pBuf->len < 60)
+        cSegs++;
+#endif
+    return cSegs;
+}
+
+
+/**
+ * Destroy the intnet scatter / gather buffer created by
+ * vboxNetFltLinuxSkBufToSG.
+ *
+ * @param   pSG             The (scatter/)gather list.
+ * @param   pBuf            The original socket buffer that was used to create
+ *                          the scatter/gather list.
+ */
+static void vboxNetFltLinuxDestroySG(PINTNETSG pSG, struct sk_buff *pBuf)
+{
+#ifdef VBOXNETFLT_SG_SUPPORT
+    int i, iSeg = 1; /* Skip non-paged part of SKB */
+    /* Check if the extra buffer behind SG structure was used for modified packet header */
+    if (pBuf->data != pSG->aSegs[0].pv)
+        ++iSeg; /* Skip it as well */
+# ifdef LOG_ENABLED
+    if (pBuf->data_len)
+        Log6(("kunmap_atomic:"));
+# endif /* LOG_ENABLED */
+    /* iSeg now points to the first mapped fragment if there are any */
+    for (i = 0; i < skb_shinfo(pBuf)->nr_frags; i++)
+    {
+        Log6((" %p", pSG->aSegs[iSeg].pv));
+        VBOX_SKB_KUNMAP_FRAG(pSG->aSegs[iSeg++].pv);
+    }
+    struct sk_buff *pFragBuf;
+    for (pFragBuf = skb_shinfo(pBuf)->frag_list; pFragBuf; pFragBuf = pFragBuf->next)
+    {
+        ++iSeg; /* Non-fragment (unmapped) portion of chained SKB */
+        for (i = 0; i < skb_shinfo(pFragBuf)->nr_frags; i++)
+        {
+            Log6((" %p", pSG->aSegs[iSeg].pv));
+            VBOX_SKB_KUNMAP_FRAG(pSG->aSegs[iSeg++].pv);
+        }
+    }
+# ifdef LOG_ENABLED
+    if (pBuf->data_len)
+        Log6(("\n"));
+# endif /* LOG_ENABLED */
+#endif
+    NOREF(pSG);
+}
+
+#ifdef LOG_ENABLED
+/**
+ * Logging helper.
+ */
+static void vboxNetFltDumpPacket(PINTNETSG pSG, bool fEgress, const char *pszWhere, int iIncrement)
+{
+    int i, offSeg;
+    uint8_t *pInt, *pExt;
+    static int iPacketNo = 1;
+    iPacketNo += iIncrement;
+    if (fEgress)
+    {
+        pExt = pSG->aSegs[0].pv;
+        pInt = pExt + 6;
+    }
+    else
+    {
+        pInt = pSG->aSegs[0].pv;
+        pExt = pInt + 6;
+    }
+    Log(("VBoxNetFlt: (int)%02x:%02x:%02x:%02x:%02x:%02x"
+         " %s (%s)%02x:%02x:%02x:%02x:%02x:%02x (%u bytes) packet #%u\n",
+         pInt[0], pInt[1], pInt[2], pInt[3], pInt[4], pInt[5],
+         fEgress ? "-->" : "<--", pszWhere,
+         pExt[0], pExt[1], pExt[2], pExt[3], pExt[4], pExt[5],
+         pSG->cbTotal, iPacketNo));
+    if (pSG->cSegsUsed == 1)
+    {
+        Log4(("%.*Rhxd\n", pSG->aSegs[0].cb, pSG->aSegs[0].pv));
+    }
+    else
+    {
+        for (i = 0, offSeg = 0; i < pSG->cSegsUsed; i++)
+        {
+            Log4(("-- segment %d at 0x%x (%d bytes)\n --\n%.*Rhxd\n",
+                  i, offSeg, pSG->aSegs[i].cb, pSG->aSegs[i].cb, pSG->aSegs[i].pv));
+            offSeg += pSG->aSegs[i].cb;
+        }
+    }
+}
+#else
+# define vboxNetFltDumpPacket(a, b, c, d) do {} while (0)
+#endif
+
+#ifdef VBOXNETFLT_WITH_GSO_RECV
+
+/**
+ * Worker for vboxNetFltLinuxForwardToIntNet that checks if we can forwards a
+ * GSO socket buffer without having to segment it.
+ *
+ * @returns true on success, false if needs segmenting.
+ * @param   pThis               The net filter instance.
+ * @param   pSkb                The GSO socket buffer.
+ * @param   fSrc                The source.
+ * @param   pGsoCtx             Where to return the GSO context on success.
+ */
+static bool vboxNetFltLinuxCanForwardAsGso(PVBOXNETFLTINS pThis, struct sk_buff *pSkb, uint32_t fSrc,
+                                           PPDMNETWORKGSO pGsoCtx)
+{
+    PDMNETWORKGSOTYPE   enmGsoType;
+    uint16_t            uEtherType;
+    unsigned int        cbTransport;
+    unsigned int        offTransport;
+    unsigned int        cbTransportHdr;
+    unsigned            uProtocol;
+    union
+    {
+        RTNETIPV4           IPv4;
+        RTNETIPV6           IPv6;
+        RTNETTCP            Tcp;
+        uint8_t             ab[40];
+        uint16_t            au16[40/2];
+        uint32_t            au32[40/4];
+    }                   Buf;
+
+    /*
+     * Check the GSO properties of the socket buffer and make sure it fits.
+     */
+    /** @todo Figure out how to handle SKB_GSO_TCP_ECN! */
+    if (RT_UNLIKELY( skb_shinfo(pSkb)->gso_type & ~(SKB_GSO_DODGY | SKB_GSO_TCPV6 | SKB_GSO_TCPV4) ))
+    {
+        Log5(("vboxNetFltLinuxCanForwardAsGso: gso_type=%#x\n", skb_shinfo(pSkb)->gso_type));
+        return false;
+    }
+    if (RT_UNLIKELY(   skb_shinfo(pSkb)->gso_size < 1
+                    || pSkb->len > VBOX_MAX_GSO_SIZE ))
+    {
+        Log5(("vboxNetFltLinuxCanForwardAsGso: gso_size=%#x skb_len=%#x (max=%#x)\n", skb_shinfo(pSkb)->gso_size, pSkb->len, VBOX_MAX_GSO_SIZE));
+        return false;
+    }
+
+    /*
+     * Switch on the ethertype.
+     */
+    uEtherType = pSkb->protocol;
+    if (   uEtherType    == RT_H2N_U16_C(RTNET_ETHERTYPE_VLAN)
+        && pSkb->mac_len == sizeof(RTNETETHERHDR) + sizeof(uint32_t))
+    {
+        uint16_t const *puEtherType = skb_header_pointer(pSkb, sizeof(RTNETETHERHDR) + sizeof(uint16_t), sizeof(uint16_t), &Buf);
+        if (puEtherType)
+            uEtherType = *puEtherType;
+    }
+    switch (uEtherType)
+    {
+        case RT_H2N_U16_C(RTNET_ETHERTYPE_IPV4):
+        {
+            unsigned int cbHdr;
+            PCRTNETIPV4  pIPv4 = (PCRTNETIPV4)skb_header_pointer(pSkb, pSkb->mac_len, sizeof(Buf.IPv4), &Buf);
+            if (RT_UNLIKELY(!pIPv4))
+            {
+                Log5(("vboxNetFltLinuxCanForwardAsGso: failed to access IPv4 hdr\n"));
+                return false;
+            }
+
+            cbHdr       = pIPv4->ip_hl * 4;
+            cbTransport = RT_N2H_U16(pIPv4->ip_len);
+            if (RT_UNLIKELY(   cbHdr < RTNETIPV4_MIN_LEN
+                            || cbHdr > cbTransport ))
+            {
+                Log5(("vboxNetFltLinuxCanForwardAsGso: invalid IPv4 lengths: ip_hl=%u ip_len=%u\n", pIPv4->ip_hl, RT_N2H_U16(pIPv4->ip_len)));
+                return false;
+            }
+            cbTransport -= cbHdr;
+            offTransport = pSkb->mac_len + cbHdr;
+            uProtocol    = pIPv4->ip_p;
+            if (uProtocol == RTNETIPV4_PROT_TCP)
+                enmGsoType = PDMNETWORKGSOTYPE_IPV4_TCP;
+            else if (uProtocol == RTNETIPV4_PROT_UDP)
+                enmGsoType = PDMNETWORKGSOTYPE_IPV4_UDP;
+            else /** @todo IPv6: 4to6 tunneling */
+                enmGsoType = PDMNETWORKGSOTYPE_INVALID;
+            break;
+        }
+
+        case RT_H2N_U16_C(RTNET_ETHERTYPE_IPV6):
+        {
+            PCRTNETIPV6 pIPv6 = (PCRTNETIPV6)skb_header_pointer(pSkb, pSkb->mac_len, sizeof(Buf.IPv6), &Buf);
+            if (RT_UNLIKELY(!pIPv6))
+            {
+                Log5(("vboxNetFltLinuxCanForwardAsGso: failed to access IPv6 hdr\n"));
+                return false;
+            }
+
+            cbTransport  = RT_N2H_U16(pIPv6->ip6_plen);
+            offTransport = pSkb->mac_len + sizeof(RTNETIPV6);
+            uProtocol    = pIPv6->ip6_nxt;
+            /** @todo IPv6: Dig our way out of the other headers. */
+            if (uProtocol == RTNETIPV4_PROT_TCP)
+                enmGsoType = PDMNETWORKGSOTYPE_IPV6_TCP;
+            else if (uProtocol == RTNETIPV4_PROT_UDP)
+                enmGsoType = PDMNETWORKGSOTYPE_IPV6_UDP;
+            else
+                enmGsoType = PDMNETWORKGSOTYPE_INVALID;
+            break;
+        }
+
+        default:
+            Log5(("vboxNetFltLinuxCanForwardAsGso: uEtherType=%#x\n", RT_H2N_U16(uEtherType)));
+            return false;
+    }
+
+    if (enmGsoType == PDMNETWORKGSOTYPE_INVALID)
+    {
+        Log5(("vboxNetFltLinuxCanForwardAsGso: Unsupported protocol %d\n", uProtocol));
+        return false;
+    }
+
+    if (RT_UNLIKELY(   offTransport + cbTransport <= offTransport
+                    || offTransport + cbTransport > pSkb->len
+                    || cbTransport < (uProtocol == RTNETIPV4_PROT_TCP ? RTNETTCP_MIN_LEN : RTNETUDP_MIN_LEN)) )
+    {
+        Log5(("vboxNetFltLinuxCanForwardAsGso: Bad transport length; off=%#x + cb=%#x => %#x; skb_len=%#x (%s)\n",
+              offTransport, cbTransport, offTransport + cbTransport, pSkb->len, PDMNetGsoTypeName(enmGsoType) ));
+        return false;
+    }
+
+    /*
+     * Check the TCP/UDP bits.
+     */
+    if (uProtocol == RTNETIPV4_PROT_TCP)
+    {
+        PCRTNETTCP pTcp = (PCRTNETTCP)skb_header_pointer(pSkb, offTransport, sizeof(Buf.Tcp), &Buf);
+        if (RT_UNLIKELY(!pTcp))
+        {
+            Log5(("vboxNetFltLinuxCanForwardAsGso: failed to access TCP hdr\n"));
+            return false;
+        }
+
+        cbTransportHdr = pTcp->th_off * 4;
+        pGsoCtx->cbHdrsSeg = offTransport + cbTransportHdr;
+        if (RT_UNLIKELY(   cbTransportHdr < RTNETTCP_MIN_LEN
+                        || cbTransportHdr > cbTransport
+                        || offTransport + cbTransportHdr >= UINT8_MAX
+                        || offTransport + cbTransportHdr >= pSkb->len ))
+        {
+            Log5(("vboxNetFltLinuxCanForwardAsGso: No space for TCP header; off=%#x cb=%#x skb_len=%#x\n", offTransport, cbTransportHdr, pSkb->len));
+            return false;
+        }
+
+    }
+    else
+    {
+        Assert(uProtocol == RTNETIPV4_PROT_UDP);
+        cbTransportHdr = sizeof(RTNETUDP);
+        pGsoCtx->cbHdrsSeg = offTransport; /* Exclude UDP header */
+        if (RT_UNLIKELY(   offTransport + cbTransportHdr >= UINT8_MAX
+                        || offTransport + cbTransportHdr >= pSkb->len ))
+        {
+            Log5(("vboxNetFltLinuxCanForwardAsGso: No space for UDP header; off=%#x skb_len=%#x\n", offTransport, pSkb->len));
+            return false;
+        }
+    }
+
+    /*
+     * We're good, init the GSO context.
+     */
+    pGsoCtx->u8Type       = enmGsoType;
+    pGsoCtx->cbHdrsTotal  = offTransport + cbTransportHdr;
+    pGsoCtx->cbMaxSeg     = skb_shinfo(pSkb)->gso_size;
+    pGsoCtx->offHdr1      = pSkb->mac_len;
+    pGsoCtx->offHdr2      = offTransport;
+    pGsoCtx->u8Unused     = 0;
+
+    return true;
+}
+
+/**
+ * Forward the socket buffer as a GSO internal network frame.
+ *
+ * @returns IPRT status code.
+ * @param   pThis               The net filter instance.
+ * @param   pSkb                The GSO socket buffer.
+ * @param   fSrc                The source.
+ * @param   pGsoCtx             Where to return the GSO context on success.
+ */
+static int vboxNetFltLinuxForwardAsGso(PVBOXNETFLTINS pThis, struct sk_buff *pSkb, uint32_t fSrc, PCPDMNETWORKGSO pGsoCtx)
+{
+    int         rc;
+    unsigned    cbExtra;
+    unsigned    cSegs = vboxNetFltLinuxCalcSGSegments(pSkb, &cbExtra);
+    PINTNETSG pSG = (PINTNETSG)alloca(RT_UOFFSETOF_DYN(INTNETSG, aSegs[cSegs]) + cbExtra);
+    if (RT_LIKELY(pSG))
+    {
+        vboxNetFltLinuxSkBufToSG(pThis, pSkb, pSG, cbExtra, cSegs, fSrc, pGsoCtx);
+
+        vboxNetFltDumpPacket(pSG, false, (fSrc & INTNETTRUNKDIR_HOST) ? "host" : "wire", 1);
+        pThis->pSwitchPort->pfnRecv(pThis->pSwitchPort, NULL /* pvIf */, pSG, fSrc);
+
+        vboxNetFltLinuxDestroySG(pSG, pSkb);
+        rc = VINF_SUCCESS;
+    }
+    else
+    {
+        Log(("VBoxNetFlt: Dropping the sk_buff (failure case).\n"));
+        rc = VERR_NO_MEMORY;
+    }
+    return rc;
+}
+
+#endif /* VBOXNETFLT_WITH_GSO_RECV */
+
+/**
+ * Worker for vboxNetFltLinuxForwardToIntNet.
+ *
+ * @returns VINF_SUCCESS or VERR_NO_MEMORY.
+ * @param   pThis               The net filter instance.
+ * @param   pBuf                The socket buffer.
+ * @param   fSrc                The source.
+ */
+static int vboxNetFltLinuxForwardSegment(PVBOXNETFLTINS pThis, struct sk_buff *pBuf, uint32_t fSrc)
+{
+    int         rc;
+    unsigned    cbExtra;
+    unsigned    cSegs = vboxNetFltLinuxCalcSGSegments(pBuf, &cbExtra);
+    PINTNETSG pSG = (PINTNETSG)alloca(RT_UOFFSETOF_DYN(INTNETSG, aSegs[cSegs]) + cbExtra);
+    if (RT_LIKELY(pSG))
+    {
+        vboxNetFltLinuxSkBufToSG(pThis, pBuf, pSG, cbExtra, cSegs, fSrc, NULL /*pGsoCtx*/);
+
+        vboxNetFltDumpPacket(pSG, false, (fSrc & INTNETTRUNKDIR_HOST) ? "host" : "wire", 1);
+        pThis->pSwitchPort->pfnRecv(pThis->pSwitchPort, NULL /* pvIf */, pSG, fSrc);
+
+        vboxNetFltLinuxDestroySG(pSG, pBuf);
+        rc = VINF_SUCCESS;
+    }
+    else
+    {
+        Log(("VBoxNetFlt: Failed to allocate SG buffer.\n"));
+        rc = VERR_NO_MEMORY;
+    }
+    return rc;
+}
+
+
+/**
+ * I won't disclose what I do, figure it out yourself, including pThis referencing.
+ *
+ * @param   pThis       The net filter instance.
+ * @param   pBuf        The socket buffer.
+ * @param   fSrc        Where the packet comes from.
+ */
+static void vboxNetFltLinuxForwardToIntNetInner(PVBOXNETFLTINS pThis, struct sk_buff *pBuf, uint32_t fSrc)
+{
+#ifdef VBOXNETFLT_WITH_GSO
+    if (skb_is_gso(pBuf))
+    {
+        PDMNETWORKGSO GsoCtx;
+        Log6(("vboxNetFltLinuxForwardToIntNetInner: skb len=%u data_len=%u truesize=%u next=%p"
+              " nr_frags=%u gso_size=%u gso_seqs=%u gso_type=%x frag_list=%p pkt_type=%x ip_summed=%d\n",
+              pBuf->len, pBuf->data_len, pBuf->truesize, pBuf->next,
+              skb_shinfo(pBuf)->nr_frags, skb_shinfo(pBuf)->gso_size,
+              skb_shinfo(pBuf)->gso_segs, skb_shinfo(pBuf)->gso_type,
+              skb_shinfo(pBuf)->frag_list, pBuf->pkt_type, pBuf->ip_summed));
+#ifndef VBOXNETFLT_SG_SUPPORT
+        if (RT_LIKELY(fSrc & INTNETTRUNKDIR_HOST))
+        {
+            /*
+             * skb_gso_segment does the following. Do we need to do it as well?
+             */
+# if RTLNX_VER_MIN(2,6,22)
+            skb_reset_mac_header(pBuf);
+            pBuf->mac_len = pBuf->network_header - pBuf->mac_header;
+# else
+            pBuf->mac.raw = pBuf->data;
+            pBuf->mac_len = pBuf->nh.raw - pBuf->data;
+# endif
+        }
+#endif /* !VBOXNETFLT_SG_SUPPORT */
+# ifdef VBOXNETFLT_WITH_GSO_RECV
+        if (   (skb_shinfo(pBuf)->gso_type & (SKB_GSO_TCPV6 | SKB_GSO_TCPV4))
+            && vboxNetFltLinuxCanForwardAsGso(pThis, pBuf, fSrc, &GsoCtx) )
+            vboxNetFltLinuxForwardAsGso(pThis, pBuf, fSrc, &GsoCtx);
+        else
+# endif /* VBOXNETFLT_WITH_GSO_RECV */
+        {
+            /* Need to segment the packet */
+            struct sk_buff *pNext;
+            struct sk_buff *pSegment = skb_gso_segment(pBuf, 0 /*supported features*/);
+            if (IS_ERR(pSegment))
+            {
+                LogRel(("VBoxNetFlt: Failed to segment a packet (%d).\n", PTR_ERR(pSegment)));
+                return;
+            }
+
+            for (; pSegment; pSegment = pNext)
+            {
+                Log6(("vboxNetFltLinuxForwardToIntNetInner: segment len=%u data_len=%u truesize=%u next=%p"
+                      " nr_frags=%u gso_size=%u gso_seqs=%u gso_type=%x frag_list=%p pkt_type=%x\n",
+                      pSegment->len, pSegment->data_len, pSegment->truesize, pSegment->next,
+                      skb_shinfo(pSegment)->nr_frags, skb_shinfo(pSegment)->gso_size,
+                      skb_shinfo(pSegment)->gso_segs, skb_shinfo(pSegment)->gso_type,
+                      skb_shinfo(pSegment)->frag_list, pSegment->pkt_type));
+                pNext = pSegment->next;
+                pSegment->next = 0;
+                vboxNetFltLinuxForwardSegment(pThis, pSegment, fSrc);
+                dev_kfree_skb(pSegment);
+            }
+        }
+    }
+    else
+#endif /* VBOXNETFLT_WITH_GSO */
+    {
+        Log6(("vboxNetFltLinuxForwardToIntNetInner: ptk_type=%d ip_summed=%d len=%d"
+              " data_len=%d headroom=%d hdr_len=%d csum_offset=%d\n",
+              pBuf->pkt_type, pBuf->ip_summed, pBuf->len, pBuf->data_len, skb_headroom(pBuf),
+              skb_headlen(pBuf), vboxNetFltLinuxGetChecksumStartOffset(pBuf)));
+#ifndef VBOXNETFLT_SG_SUPPORT
+        if (pBuf->ip_summed == CHECKSUM_PARTIAL && pBuf->pkt_type == PACKET_OUTGOING)
+        {
+# if RTLNX_VER_MIN(2,6,19)
+            int rc = VBOX_SKB_CHECKSUM_HELP(pBuf);
+# else
+            /*
+             * Try to work around the problem with CentOS 4.7 and 5.2 (2.6.9
+             * and 2.6.18 kernels), they pass wrong 'h' pointer down. We take IP
+             * header length from the header itself and reconstruct 'h' pointer
+             * to TCP (or whatever) header.
+             */
+            unsigned char *tmp = pBuf->h.raw;
+            if (pBuf->h.raw == pBuf->nh.raw && pBuf->protocol == htons(ETH_P_IP))
+                pBuf->h.raw = pBuf->nh.raw + pBuf->nh.iph->ihl * 4;
+            int rc = VBOX_SKB_CHECKSUM_HELP(pBuf);
+            /* Restore the original (wrong) pointer. */
+            pBuf->h.raw = tmp;
+# endif
+            if (rc)
+            {
+                LogRel(("VBoxNetFlt: Failed to compute checksum, dropping the packet.\n"));
+                return;
+            }
+        }
+#endif /* !VBOXNETFLT_SG_SUPPORT */
+        vboxNetFltLinuxForwardSegment(pThis, pBuf, fSrc);
+    }
+}
+
+
+/**
+ * Temporarily adjust pBuf->data so it always points to the Ethernet header,
+ * then forward it to the internal network.
+ *
+ * @param   pThis       The net filter instance.
+ * @param   pBuf        The socket buffer.  This is consumed by this function.
+ */
+static void vboxNetFltLinuxForwardToIntNet(PVBOXNETFLTINS pThis, struct sk_buff *pBuf)
+{
+    uint32_t fSrc = pBuf->pkt_type == PACKET_OUTGOING ? INTNETTRUNKDIR_HOST : INTNETTRUNKDIR_WIRE;
+
+    if (RT_UNLIKELY(fSrc & INTNETTRUNKDIR_WIRE))
+    {
+        /*
+         * The packet came from the wire and the driver has already consumed
+         * mac header. We need to restore it back. Moreover, after we are
+         * through with this skb we need to restore its original state!
+         */
+        skb_push(pBuf, pBuf->mac_len);
+        Log5(("vboxNetFltLinuxForwardToIntNet: mac_len=%d data=%p mac_header=%p network_header=%p\n",
+              pBuf->mac_len, pBuf->data, skb_mac_header(pBuf), skb_network_header(pBuf)));
+    }
+
+    vboxNetFltLinuxForwardToIntNetInner(pThis, pBuf, fSrc);
+
+    /*
+     * Restore the original state of skb as there are other handlers this skb
+     * will be provided to.
+     */
+    if (RT_UNLIKELY(fSrc & INTNETTRUNKDIR_WIRE))
+        skb_pull(pBuf, pBuf->mac_len);
+
+    dev_kfree_skb(pBuf);
+}
+
+
+#ifndef VBOXNETFLT_LINUX_NO_XMIT_QUEUE
+/**
+ * Work queue handler that forwards the socket buffers queued by
+ * vboxNetFltLinuxPacketHandler to the internal network.
+ *
+ * @param   pWork               The work queue.
+ */
+# if RTLNX_VER_MIN(2,6,20)
+static void vboxNetFltLinuxXmitTask(struct work_struct *pWork)
+# else
+static void vboxNetFltLinuxXmitTask(void *pWork)
+# endif
+{
+    PVBOXNETFLTINS  pThis   = VBOX_FLT_XT_TO_INST(pWork);
+    struct sk_buff *pBuf;
+
+    Log6(("vboxNetFltLinuxXmitTask: Got work %p.\n", pWork));
+
+    /*
+     * Active? Retain the instance and increment the busy counter.
+     */
+    if (vboxNetFltTryRetainBusyActive(pThis))
+    {
+        while ((pBuf = skb_dequeue(&pThis->u.s.XmitQueue)) != NULL)
+            vboxNetFltLinuxForwardToIntNet(pThis, pBuf);
+
+        vboxNetFltRelease(pThis, true /* fBusy */);
+    }
+    else
+    {
+        /** @todo Shouldn't we just drop the packets here? There is little point in
+         *        making them accumulate when the VM is paused and it'll only waste
+         *        kernel memory anyway... Hmm. maybe wait a short while (2-5 secs)
+         *        before start draining the packets (goes for the intnet ring buf
+         *        too)? */
+    }
+}
+#endif /* !VBOXNETFLT_LINUX_NO_XMIT_QUEUE */
+
+/**
+ * Reports the GSO capabilities of the hardware NIC.
+ *
+ * @param   pThis               The net filter instance.  The caller hold a
+ *                              reference to this.
+ */
+static void vboxNetFltLinuxReportNicGsoCapabilities(PVBOXNETFLTINS pThis)
+{
+#ifdef VBOXNETFLT_WITH_GSO_XMIT_WIRE
+    if (vboxNetFltTryRetainBusyNotDisconnected(pThis))
+    {
+        struct net_device  *pDev;
+        PINTNETTRUNKSWPORT  pSwitchPort;
+        unsigned int        fFeatures;
+
+        RTSpinlockAcquire(pThis->hSpinlock);
+
+        pSwitchPort = pThis->pSwitchPort; /* this doesn't need to be here, but it doesn't harm. */
+        pDev = ASMAtomicUoReadPtrT(&pThis->u.s.pDev, struct net_device *);
+        if (pDev)
+            fFeatures = pDev->features;
+        else
+            fFeatures = 0;
+
+        RTSpinlockRelease(pThis->hSpinlock);
+
+        if (pThis->pSwitchPort)
+        {
+            /* Set/update the GSO capabilities of the NIC. */
+            uint32_t fGsoCapabilites = 0;
+            if (fFeatures & NETIF_F_TSO)
+                fGsoCapabilites |= RT_BIT_32(PDMNETWORKGSOTYPE_IPV4_TCP);
+            if (fFeatures & NETIF_F_TSO6)
+                fGsoCapabilites |= RT_BIT_32(PDMNETWORKGSOTYPE_IPV6_TCP);
+            Log3(("vboxNetFltLinuxReportNicGsoCapabilities: reporting wire %s%s%s%s\n",
+                  (fGsoCapabilites & RT_BIT_32(PDMNETWORKGSOTYPE_IPV4_TCP)) ? "tso " : "",
+                  (fGsoCapabilites & RT_BIT_32(PDMNETWORKGSOTYPE_IPV6_TCP)) ? "tso6 " : ""));
+            pThis->pSwitchPort->pfnReportGsoCapabilities(pThis->pSwitchPort, fGsoCapabilites, INTNETTRUNKDIR_WIRE);
+        }
+
+        vboxNetFltRelease(pThis, true /*fBusy*/);
+    }
+#endif /* VBOXNETFLT_WITH_GSO_XMIT_WIRE */
+}
+
+/**
+ * Helper that determines whether the host (ignoreing us) is operating the
+ * interface in promiscuous mode or not.
+ */
+static bool vboxNetFltLinuxPromiscuous(PVBOXNETFLTINS pThis)
+{
+    bool                fRc  = false;
+    struct net_device * pDev = vboxNetFltLinuxRetainNetDev(pThis);
+    if (pDev)
+    {
+        fRc = !!(pDev->promiscuity - (ASMAtomicUoReadBool(&pThis->u.s.fPromiscuousSet) & 1));
+        LogFlow(("vboxNetFltPortOsIsPromiscuous: returns %d, pDev->promiscuity=%d, fPromiscuousSet=%d\n",
+                 fRc, pDev->promiscuity, pThis->u.s.fPromiscuousSet));
+        vboxNetFltLinuxReleaseNetDev(pThis, pDev);
+    }
+    return fRc;
+}
+
+/**
+ * Does this device needs link state change signaled?
+ * Currently we need it for our own VBoxNetAdp and TAP.
+ */
+static bool vboxNetFltNeedsLinkState(PVBOXNETFLTINS pThis, struct net_device *pDev)
+{
+    if (pDev->ethtool_ops && pDev->ethtool_ops->get_drvinfo)
+    {
+        struct ethtool_drvinfo Info;
+
+        memset(&Info, 0, sizeof(Info));
+        Info.cmd = ETHTOOL_GDRVINFO;
+        pDev->ethtool_ops->get_drvinfo(pDev, &Info);
+        Log3(("%s: driver=%.*s version=%.*s bus_info=%.*s\n",
+              __FUNCTION__,
+              sizeof(Info.driver),   Info.driver,
+              sizeof(Info.version),  Info.version,
+              sizeof(Info.bus_info), Info.bus_info));
+
+        if (!strncmp(Info.driver, "vboxnet", sizeof(Info.driver)))
+            return true;
+
+#if RTLNX_VER_MIN(2,6,36) /* TAP started doing carrier */
+        return !strncmp(Info.driver,   "tun", 4)
+            && !strncmp(Info.bus_info, "tap", 4);
+#endif
+    }
+
+    return false;
+}
+
+#if RTLNX_VER_MAX(2,6,18)
+DECLINLINE(void) netif_tx_lock_bh(struct net_device *pDev)
+{
+    spin_lock_bh(&pDev->xmit_lock);
+}
+
+DECLINLINE(void) netif_tx_unlock_bh(struct net_device *pDev)
+{
+    spin_unlock_bh(&pDev->xmit_lock);
+}
+#endif
+
+/**
+ * Some devices need link state change when filter attaches/detaches
+ * since the filter is their link in a sense.
+ */
+static void vboxNetFltSetLinkState(PVBOXNETFLTINS pThis, struct net_device *pDev, bool fLinkUp)
+{
+    if (vboxNetFltNeedsLinkState(pThis, pDev))
+    {
+        Log3(("%s: bringing device link %s\n",
+              __FUNCTION__, fLinkUp ? "up" : "down"));
+        netif_tx_lock_bh(pDev);
+        if (fLinkUp)
+            netif_carrier_on(pDev);
+        else
+            netif_carrier_off(pDev);
+        netif_tx_unlock_bh(pDev);
+    }
+}
+
+/**
+ * Internal worker for vboxNetFltLinuxNotifierCallback.
+ *
+ * @returns VBox status code.
+ * @param   pThis           The instance.
+ * @param   pDev            The device to attach to.
+ */
+static int vboxNetFltLinuxAttachToInterface(PVBOXNETFLTINS pThis, struct net_device *pDev)
+{
+    LogFlow(("vboxNetFltLinuxAttachToInterface: pThis=%p (%s)\n", pThis, pThis->szName));
+
+    /*
+     * Retain and store the device.
+     */
+    dev_hold(pDev);
+
+    RTSpinlockAcquire(pThis->hSpinlock);
+    ASMAtomicUoWritePtr(&pThis->u.s.pDev, pDev);
+    RTSpinlockRelease(pThis->hSpinlock);
+
+    Log(("vboxNetFltLinuxAttachToInterface: Device %p(%s) retained. ref=%d\n",
+          pDev, pDev->name,
+#if RTLNX_VER_MIN(2,6,37)
+          netdev_refcnt_read(pDev)
+#else
+          atomic_read(&pDev->refcnt)
+#endif
+          ));
+    Log(("vboxNetFltLinuxAttachToInterface: Got pDev=%p pThis=%p pThis->u.s.pDev=%p\n",
+          pDev, pThis, ASMAtomicUoReadPtrT(&pThis->u.s.pDev, struct net_device *)));
+
+    /* Get the mac address while we still have a valid net_device reference. */
+    memcpy(&pThis->u.s.MacAddr, pDev->dev_addr, sizeof(pThis->u.s.MacAddr));
+    /* Initialize MTU */
+    pThis->u.s.cbMtu = pDev->mtu;
+
+    /*
+     * Install a packet filter for this device with a protocol wildcard (ETH_P_ALL).
+     */
+    pThis->u.s.PacketType.type = __constant_htons(ETH_P_ALL);
+    pThis->u.s.PacketType.dev  = pDev;
+    pThis->u.s.PacketType.func = vboxNetFltLinuxPacketHandler;
+    dev_add_pack(&pThis->u.s.PacketType);
+    ASMAtomicUoWriteBool(&pThis->u.s.fPacketHandler, true);
+    Log(("vboxNetFltLinuxAttachToInterface: this=%p: Packet handler installed.\n", pThis));
+
+#ifdef VBOXNETFLT_WITH_HOST2WIRE_FILTER
+    vboxNetFltLinuxHookDev(pThis, pDev);
+#endif
+
+    /*
+     * Are we the "carrier" for this device (e.g. vboxnet or tap)?
+     */
+    vboxNetFltSetLinkState(pThis, pDev, true);
+
+    /*
+     * Set indicators that require the spinlock. Be abit paranoid about racing
+     * the device notification handle.
+     */
+    RTSpinlockAcquire(pThis->hSpinlock);
+    pDev = ASMAtomicUoReadPtrT(&pThis->u.s.pDev, struct net_device *);
+    if (pDev)
+    {
+        ASMAtomicUoWriteBool(&pThis->fDisconnectedFromHost, false);
+        ASMAtomicUoWriteBool(&pThis->u.s.fRegistered, true);
+        pDev = NULL; /* don't dereference it */
+    }
+    RTSpinlockRelease(pThis->hSpinlock);
+
+    /*
+     * Report GSO capabilities
+     */
+    Assert(pThis->pSwitchPort);
+    if (vboxNetFltTryRetainBusyNotDisconnected(pThis))
+    {
+        vboxNetFltLinuxReportNicGsoCapabilities(pThis);
+        pThis->pSwitchPort->pfnReportMacAddress(pThis->pSwitchPort, &pThis->u.s.MacAddr);
+        pThis->pSwitchPort->pfnReportPromiscuousMode(pThis->pSwitchPort, vboxNetFltLinuxPromiscuous(pThis));
+        pThis->pSwitchPort->pfnReportNoPreemptDsts(pThis->pSwitchPort, INTNETTRUNKDIR_WIRE | INTNETTRUNKDIR_HOST);
+        vboxNetFltRelease(pThis, true /*fBusy*/);
+    }
+
+    LogRel(("VBoxNetFlt: attached to '%s' / %RTmac\n", pThis->szName, &pThis->u.s.MacAddr));
+    return VINF_SUCCESS;
+}
+
+
+static int vboxNetFltLinuxUnregisterDevice(PVBOXNETFLTINS pThis, struct net_device *pDev)
+{
+    bool fRegistered;
+    Assert(!pThis->fDisconnectedFromHost);
+
+#ifdef VBOXNETFLT_WITH_HOST2WIRE_FILTER
+    vboxNetFltLinuxUnhookDev(pThis, pDev);
+#endif
+
+    if (ASMAtomicCmpXchgBool(&pThis->u.s.fPacketHandler, false, true))
+    {
+        dev_remove_pack(&pThis->u.s.PacketType);
+        Log(("vboxNetFltLinuxUnregisterDevice: this=%p: packet handler removed.\n", pThis));
+    }
+
+    RTSpinlockAcquire(pThis->hSpinlock);
+    fRegistered = ASMAtomicXchgBool(&pThis->u.s.fRegistered, false);
+    if (fRegistered)
+    {
+        ASMAtomicWriteBool(&pThis->fDisconnectedFromHost, true);
+        ASMAtomicUoWriteNullPtr(&pThis->u.s.pDev);
+    }
+    RTSpinlockRelease(pThis->hSpinlock);
+
+    if (fRegistered)
+    {
+#ifndef VBOXNETFLT_LINUX_NO_XMIT_QUEUE
+        skb_queue_purge(&pThis->u.s.XmitQueue);
+#endif
+        Log(("vboxNetFltLinuxUnregisterDevice: this=%p: xmit queue purged.\n", pThis));
+        Log(("vboxNetFltLinuxUnregisterDevice: Device %p(%s) released. ref=%d\n",
+             pDev, pDev->name,
+#if RTLNX_VER_MIN(2,6,37)
+             netdev_refcnt_read(pDev)
+#else
+             atomic_read(&pDev->refcnt)
+#endif
+           ));
+        dev_put(pDev);
+    }
+
+    return NOTIFY_OK;
+}
+
+static int vboxNetFltLinuxDeviceIsUp(PVBOXNETFLTINS pThis, struct net_device *pDev)
+{
+    /* Check if we are not suspended and promiscuous mode has not been set. */
+    if (   pThis->enmTrunkState == INTNETTRUNKIFSTATE_ACTIVE
+        && !ASMAtomicUoReadBool(&pThis->u.s.fPromiscuousSet))
+    {
+        /* Note that there is no need for locking as the kernel got hold of the lock already. */
+        dev_set_promiscuity(pDev, 1);
+        ASMAtomicWriteBool(&pThis->u.s.fPromiscuousSet, true);
+        Log(("vboxNetFltLinuxDeviceIsUp: enabled promiscuous mode on %s (%d)\n", pThis->szName, pDev->promiscuity));
+    }
+    else
+        Log(("vboxNetFltLinuxDeviceIsUp: no need to enable promiscuous mode on %s (%d)\n", pThis->szName, pDev->promiscuity));
+    return NOTIFY_OK;
+}
+
+static int vboxNetFltLinuxDeviceGoingDown(PVBOXNETFLTINS pThis, struct net_device *pDev)
+{
+    /* Undo promiscuous mode if we has set it. */
+    if (ASMAtomicUoReadBool(&pThis->u.s.fPromiscuousSet))
+    {
+        /* Note that there is no need for locking as the kernel got hold of the lock already. */
+        dev_set_promiscuity(pDev, -1);
+        ASMAtomicWriteBool(&pThis->u.s.fPromiscuousSet, false);
+        Log(("vboxNetFltLinuxDeviceGoingDown: disabled promiscuous mode on %s (%d)\n", pThis->szName, pDev->promiscuity));
+    }
+    else
+        Log(("vboxNetFltLinuxDeviceGoingDown: no need to disable promiscuous mode on %s (%d)\n", pThis->szName, pDev->promiscuity));
+    return NOTIFY_OK;
+}
+
+/**
+ * Callback for listening to MTU change event.
+ *
+ * We need to track changes of host's inteface MTU to discard over-sized frames
+ * coming from the internal network as they may hang the TX queue of host's
+ * adapter.
+ *
+ * @returns NOTIFY_OK
+ * @param   pThis               The netfilter instance.
+ * @param   pDev                Pointer to device structure of host's interface.
+ */
+static int vboxNetFltLinuxDeviceMtuChange(PVBOXNETFLTINS pThis, struct net_device *pDev)
+{
+    ASMAtomicWriteU32(&pThis->u.s.cbMtu, pDev->mtu);
+    Log(("vboxNetFltLinuxDeviceMtuChange: set MTU for %s to %d\n", pThis->szName, pDev->mtu));
+    return NOTIFY_OK;
+}
+
+#ifdef LOG_ENABLED
+/** Stringify the NETDEV_XXX constants. */
+static const char *vboxNetFltLinuxGetNetDevEventName(unsigned long ulEventType)
+{
+    const char *pszEvent = "NETDEV_<unknown>";
+    switch (ulEventType)
+    {
+        case NETDEV_REGISTER: pszEvent = "NETDEV_REGISTER"; break;
+        case NETDEV_UNREGISTER: pszEvent = "NETDEV_UNREGISTER"; break;
+        case NETDEV_UP: pszEvent = "NETDEV_UP"; break;
+        case NETDEV_DOWN: pszEvent = "NETDEV_DOWN"; break;
+        case NETDEV_REBOOT: pszEvent = "NETDEV_REBOOT"; break;
+        case NETDEV_CHANGENAME: pszEvent = "NETDEV_CHANGENAME"; break;
+        case NETDEV_CHANGE: pszEvent = "NETDEV_CHANGE"; break;
+        case NETDEV_CHANGEMTU: pszEvent = "NETDEV_CHANGEMTU"; break;
+        case NETDEV_CHANGEADDR: pszEvent = "NETDEV_CHANGEADDR"; break;
+        case NETDEV_GOING_DOWN: pszEvent = "NETDEV_GOING_DOWN"; break;
+# ifdef NETDEV_FEAT_CHANGE
+        case NETDEV_FEAT_CHANGE: pszEvent = "NETDEV_FEAT_CHANGE"; break;
+# endif
+    }
+    return pszEvent;
+}
+#endif /* LOG_ENABLED */
+
+/**
+ * Callback for listening to netdevice events.
+ *
+ * This works the rediscovery, clean up on unregistration, promiscuity on
+ * up/down, and GSO feature changes from ethtool.
+ *
+ * @returns NOTIFY_OK
+ * @param   self                Pointer to our notifier registration block.
+ * @param   ulEventType         The event.
+ * @param   ptr                 Event specific, but it is usually the device it
+ *                              relates to.
+ */
+static int vboxNetFltLinuxNotifierCallback(struct notifier_block *self, unsigned long ulEventType, void *ptr)
+
+{
+    PVBOXNETFLTINS      pThis = VBOX_FLT_NB_TO_INST(self);
+    struct net_device  *pMyDev = ASMAtomicUoReadPtrT(&pThis->u.s.pDev, struct net_device *);
+    struct net_device  *pDev  = VBOX_NETDEV_NOTIFIER_INFO_TO_DEV(ptr);
+    int                 rc    = NOTIFY_OK;
+
+    Log(("VBoxNetFlt: got event %s(0x%lx) on %s, pDev=%p pThis=%p pThis->u.s.pDev=%p\n",
+         vboxNetFltLinuxGetNetDevEventName(ulEventType), ulEventType, pDev->name, pDev, pThis, pMyDev));
+
+    if (ulEventType == NETDEV_REGISTER)
+    {
+#if RTLNX_VER_MIN(2,6,24) /* cgroups/namespaces introduced */
+# if RTLNX_VER_MIN(2,6,26)
+#  define VBOX_DEV_NET(dev)             dev_net(dev)
+#  define VBOX_NET_EQ(n1, n2)           net_eq((n1), (n2))
+# else
+#  define VBOX_DEV_NET(dev)             ((dev)->nd_net)
+#  define VBOX_NET_EQ(n1, n2)           ((n1) == (n2))
+# endif
+        struct net *pMyNet = current->nsproxy->net_ns;
+        struct net *pDevNet = VBOX_DEV_NET(pDev);
+
+        if (VBOX_NET_EQ(pDevNet, pMyNet))
+#endif  /* namespaces */
+        {
+            if (strcmp(pDev->name, pThis->szName) == 0)
+            {
+                vboxNetFltLinuxAttachToInterface(pThis, pDev);
+            }
+        }
+    }
+    else
+    {
+        if (pDev == pMyDev)
+        {
+            switch (ulEventType)
+            {
+                case NETDEV_UNREGISTER:
+                    rc = vboxNetFltLinuxUnregisterDevice(pThis, pDev);
+                    break;
+                case NETDEV_UP:
+                    rc = vboxNetFltLinuxDeviceIsUp(pThis, pDev);
+                    break;
+                case NETDEV_GOING_DOWN:
+                    rc = vboxNetFltLinuxDeviceGoingDown(pThis, pDev);
+                    break;
+                case NETDEV_CHANGEMTU:
+                    rc = vboxNetFltLinuxDeviceMtuChange(pThis, pDev);
+                    break;
+                case NETDEV_CHANGENAME:
+                    break;
+#ifdef NETDEV_FEAT_CHANGE
+                case NETDEV_FEAT_CHANGE:
+                    vboxNetFltLinuxReportNicGsoCapabilities(pThis);
+                    break;
+#endif
+            }
+        }
+    }
+
+    return rc;
+}
+
+/*
+ * Initial enumeration of netdevs.  Called with NETDEV_REGISTER by
+ * register_netdevice_notifier() under rtnl lock.
+ */
+static int vboxNetFltLinuxEnumeratorCallback(struct notifier_block *self, unsigned long ulEventType, void *ptr)
+{
+    PVBOXNETFLTINS pThis = ((PVBOXNETFLTNOTIFIER)self)->pThis;
+    struct net_device *dev  = VBOX_NETDEV_NOTIFIER_INFO_TO_DEV(ptr);
+    struct in_device *in_dev;
+    struct inet6_dev *in6_dev;
+
+    if (ulEventType != NETDEV_REGISTER)
+        return NOTIFY_OK;
+
+    if (RT_UNLIKELY(pThis->pSwitchPort->pfnNotifyHostAddress == NULL))
+        return NOTIFY_OK;
+
+    /*
+     * IPv4
+     */
+#if RTLNX_VER_MIN(2,6,14)
+    in_dev = __in_dev_get_rtnl(dev);
+#else
+    in_dev = __in_dev_get(dev);
+#endif
+    if (in_dev != NULL)
+    {
+        struct in_ifaddr *ifa;
+
+        for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
+            if (VBOX_IPV4_IS_LOOPBACK(ifa->ifa_address))
+                return NOTIFY_OK;
+
+            if (   dev != pThis->u.s.pDev
+                && VBOX_IPV4_IS_LINKLOCAL_169(ifa->ifa_address))
+                continue;
+
+            Log(("%s: %s: IPv4 addr %RTnaipv4 mask %RTnaipv4\n",
+                 __FUNCTION__, VBOX_NETDEV_NAME(dev),
+                 ifa->ifa_address, ifa->ifa_mask));
+
+            pThis->pSwitchPort->pfnNotifyHostAddress(pThis->pSwitchPort,
+                /* :fAdded */ true, kIntNetAddrType_IPv4, &ifa->ifa_address);
+        }
+    }
+
+    /*
+     * IPv6
+     */
+    in6_dev = __in6_dev_get(dev);
+    if (in6_dev != NULL)
+    {
+        struct inet6_ifaddr *ifa;
+
+        read_lock_bh(&in6_dev->lock);
+#if RTLNX_VER_MIN(2,6,35)
+        list_for_each_entry(ifa, &in6_dev->addr_list, if_list)
+#else
+        for (ifa = in6_dev->addr_list; ifa != NULL; ifa = ifa->if_next)
+#endif
+        {
+            if (   dev != pThis->u.s.pDev
+                && ipv6_addr_type(&ifa->addr) & (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK))
+                continue;
+
+            Log(("%s: %s: IPv6 addr %RTnaipv6/%u\n",
+                 __FUNCTION__, VBOX_NETDEV_NAME(dev),
+                 &ifa->addr, (unsigned)ifa->prefix_len));
+
+            pThis->pSwitchPort->pfnNotifyHostAddress(pThis->pSwitchPort,
+                /* :fAdded */ true, kIntNetAddrType_IPv6, &ifa->addr);
+        }
+        read_unlock_bh(&in6_dev->lock);
+    }
+
+    return NOTIFY_OK;
+}
+
+
+static int vboxNetFltLinuxNotifierIPv4Callback(struct notifier_block *self, unsigned long ulEventType, void *ptr)
+{
+    PVBOXNETFLTINS     pThis = RT_FROM_MEMBER(self, VBOXNETFLTINS, u.s.NotifierIPv4);
+    struct net_device *pDev, *pEventDev;
+    struct in_ifaddr  *ifa   = (struct in_ifaddr *)ptr;
+    bool               fMyDev;
+    int                rc    = NOTIFY_OK;
+
+    pDev = vboxNetFltLinuxRetainNetDev(pThis);
+    pEventDev = ifa->ifa_dev->dev;
+    fMyDev = (pDev == pEventDev);
+    Log(("VBoxNetFlt: %s: IPv4 event %s(0x%lx) %s: addr %RTnaipv4 mask %RTnaipv4\n",
+         pDev ? VBOX_NETDEV_NAME(pDev) : "<unknown>",
+         vboxNetFltLinuxGetNetDevEventName(ulEventType), ulEventType,
+         pEventDev ? VBOX_NETDEV_NAME(pEventDev) : "<unknown>",
+         ifa->ifa_address, ifa->ifa_mask));
+
+    if (pDev != NULL)
+        vboxNetFltLinuxReleaseNetDev(pThis, pDev);
+
+    if (VBOX_IPV4_IS_LOOPBACK(ifa->ifa_address))
+        return NOTIFY_OK;
+
+    if (   !fMyDev
+        && VBOX_IPV4_IS_LINKLOCAL_169(ifa->ifa_address))
+        return NOTIFY_OK;
+
+    if (pThis->pSwitchPort->pfnNotifyHostAddress)
+    {
+        bool fAdded;
+        if (ulEventType == NETDEV_UP)
+            fAdded = true;
+        else if (ulEventType == NETDEV_DOWN)
+            fAdded = false;
+        else
+            return NOTIFY_OK;
+
+        pThis->pSwitchPort->pfnNotifyHostAddress(pThis->pSwitchPort, fAdded,
+                                                 kIntNetAddrType_IPv4, &ifa->ifa_local);
+    }
+
+    return rc;
+}
+
+
+static int vboxNetFltLinuxNotifierIPv6Callback(struct notifier_block *self, unsigned long ulEventType, void *ptr)
+{
+    PVBOXNETFLTINS       pThis = RT_FROM_MEMBER(self, VBOXNETFLTINS, u.s.NotifierIPv6);
+    struct net_device   *pDev, *pEventDev;
+    struct inet6_ifaddr *ifa   = (struct inet6_ifaddr *)ptr;
+    bool                 fMyDev;
+    int                  rc    = NOTIFY_OK;
+
+    pDev = vboxNetFltLinuxRetainNetDev(pThis);
+    pEventDev = ifa->idev->dev;
+    fMyDev = (pDev == pEventDev);
+    Log(("VBoxNetFlt: %s: IPv6 event %s(0x%lx) %s: %RTnaipv6\n",
+         pDev ? VBOX_NETDEV_NAME(pDev) : "<unknown>",
+         vboxNetFltLinuxGetNetDevEventName(ulEventType), ulEventType,
+         pEventDev ? VBOX_NETDEV_NAME(pEventDev) : "<unknown>",
+         &ifa->addr));
+
+    if (pDev != NULL)
+        vboxNetFltLinuxReleaseNetDev(pThis, pDev);
+
+    if (   !fMyDev
+        && ipv6_addr_type(&ifa->addr) & (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK))
+        return NOTIFY_OK;
+
+    if (pThis->pSwitchPort->pfnNotifyHostAddress)
+    {
+        bool fAdded;
+        if (ulEventType == NETDEV_UP)
+            fAdded = true;
+        else if (ulEventType == NETDEV_DOWN)
+            fAdded = false;
+        else
+            return NOTIFY_OK;
+
+        pThis->pSwitchPort->pfnNotifyHostAddress(pThis->pSwitchPort, fAdded,
+                                                 kIntNetAddrType_IPv6, &ifa->addr);
+    }
+
+    return rc;
+}
+
+
+bool vboxNetFltOsMaybeRediscovered(PVBOXNETFLTINS pThis)
+{
+    return !ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost);
+}
+
+int  vboxNetFltPortOsXmit(PVBOXNETFLTINS pThis, void *pvIfData, PINTNETSG pSG, uint32_t fDst)
+{
+    struct net_device * pDev;
+    int err;
+    int rc = VINF_SUCCESS;
+    IPRT_LINUX_SAVE_EFL_AC();
+    NOREF(pvIfData);
+
+    LogFlow(("vboxNetFltPortOsXmit: pThis=%p (%s)\n", pThis, pThis->szName));
+
+    pDev = vboxNetFltLinuxRetainNetDev(pThis);
+    if (pDev)
+    {
+        /*
+         * Create a sk_buff for the gather list and push it onto the wire.
+         */
+        if (fDst & INTNETTRUNKDIR_WIRE)
+        {
+            struct sk_buff *pBuf = vboxNetFltLinuxSkBufFromSG(pThis, pSG, true);
+            if (pBuf)
+            {
+                vboxNetFltDumpPacket(pSG, true, "wire", 1);
+                Log6(("vboxNetFltPortOsXmit: pBuf->cb dump:\n%.*Rhxd\n", sizeof(pBuf->cb), pBuf->cb));
+                Log6(("vboxNetFltPortOsXmit: dev_queue_xmit(%p)\n", pBuf));
+                err = dev_queue_xmit(pBuf);
+                if (err)
+                    rc = RTErrConvertFromErrno(err);
+            }
+            else
+                rc = VERR_NO_MEMORY;
+        }
+
+        /*
+         * Create a sk_buff for the gather list and push it onto the host stack.
+         */
+        if (fDst & INTNETTRUNKDIR_HOST)
+        {
+            struct sk_buff *pBuf = vboxNetFltLinuxSkBufFromSG(pThis, pSG, false);
+            if (pBuf)
+            {
+                vboxNetFltDumpPacket(pSG, true, "host", (fDst & INTNETTRUNKDIR_WIRE) ? 0 : 1);
+                Log6(("vboxNetFltPortOsXmit: pBuf->cb dump:\n%.*Rhxd\n", sizeof(pBuf->cb), pBuf->cb));
+                Log6(("vboxNetFltPortOsXmit: netif_rx_ni(%p)\n", pBuf));
+                err = netif_rx_ni(pBuf);
+                if (err)
+                    rc = RTErrConvertFromErrno(err);
+            }
+            else
+                rc = VERR_NO_MEMORY;
+        }
+
+        vboxNetFltLinuxReleaseNetDev(pThis, pDev);
+    }
+
+    IPRT_LINUX_RESTORE_EFL_AC();
+    return rc;
+}
+
+
+void vboxNetFltPortOsSetActive(PVBOXNETFLTINS pThis, bool fActive)
+{
+    struct net_device *pDev;
+    IPRT_LINUX_SAVE_EFL_AC();
+
+    LogFlow(("vboxNetFltPortOsSetActive: pThis=%p (%s), fActive=%RTbool, fDisablePromiscuous=%RTbool\n",
+             pThis, pThis->szName, fActive, pThis->fDisablePromiscuous));
+
+    if (pThis->fDisablePromiscuous)
+        return;
+
+    pDev = vboxNetFltLinuxRetainNetDev(pThis);
+    if (pDev)
+    {
+        /*
+         * This api is a bit weird, the best reference is the code.
+         *
+         * Also, we have a bit or race conditions wrt the maintenance of
+         * host the interface promiscuity for vboxNetFltPortOsIsPromiscuous.
+         */
+#ifdef LOG_ENABLED
+        u_int16_t fIf;
+        unsigned const cPromiscBefore = pDev->promiscuity;
+#endif
+        if (fActive)
+        {
+            Assert(!pThis->u.s.fPromiscuousSet);
+
+            rtnl_lock();
+            dev_set_promiscuity(pDev, 1);
+            rtnl_unlock();
+            pThis->u.s.fPromiscuousSet = true;
+            Log(("vboxNetFltPortOsSetActive: enabled promiscuous mode on %s (%d)\n", pThis->szName, pDev->promiscuity));
+        }
+        else
+        {
+            if (pThis->u.s.fPromiscuousSet)
+            {
+                rtnl_lock();
+                dev_set_promiscuity(pDev, -1);
+                rtnl_unlock();
+                Log(("vboxNetFltPortOsSetActive: disabled promiscuous mode on %s (%d)\n", pThis->szName, pDev->promiscuity));
+            }
+            pThis->u.s.fPromiscuousSet = false;
+
+#ifdef LOG_ENABLED
+            fIf = dev_get_flags(pDev);
+            Log(("VBoxNetFlt: fIf=%#x; %d->%d\n", fIf, cPromiscBefore, pDev->promiscuity));
+#endif
+        }
+
+        vboxNetFltLinuxReleaseNetDev(pThis, pDev);
+    }
+    IPRT_LINUX_RESTORE_EFL_AC();
+}
+
+
+int vboxNetFltOsDisconnectIt(PVBOXNETFLTINS pThis)
+{
+    /*
+     * Remove packet handler when we get disconnected from internal switch as
+     * we don't want the handler to forward packets to disconnected switch.
+     */
+    if (ASMAtomicCmpXchgBool(&pThis->u.s.fPacketHandler, false, true))
+    {
+        IPRT_LINUX_SAVE_EFL_AC();
+        dev_remove_pack(&pThis->u.s.PacketType);
+        Log(("vboxNetFltOsDisconnectIt: this=%p: Packet handler removed.\n", pThis));
+        IPRT_LINUX_RESTORE_EFL_AC();
+    }
+    return VINF_SUCCESS;
+}
+
+
+int  vboxNetFltOsConnectIt(PVBOXNETFLTINS pThis)
+{
+    IPRT_LINUX_SAVE_EFL_AC();
+
+    /*
+     * Report the GSO capabilities of the host and device (if connected).
+     * Note! No need to mark ourselves busy here.
+     */
+    /** @todo duplicate work here now? Attach */
+#if defined(VBOXNETFLT_WITH_GSO_XMIT_HOST)
+    Log3(("vboxNetFltOsConnectIt: reporting host tso tso6\n"));
+    pThis->pSwitchPort->pfnReportGsoCapabilities(pThis->pSwitchPort,
+                                                 0
+                                                 | RT_BIT_32(PDMNETWORKGSOTYPE_IPV4_TCP)
+                                                 | RT_BIT_32(PDMNETWORKGSOTYPE_IPV6_TCP)
+                                                 , INTNETTRUNKDIR_HOST);
+
+#endif
+    vboxNetFltLinuxReportNicGsoCapabilities(pThis);
+
+    IPRT_LINUX_RESTORE_EFL_AC();
+    return VINF_SUCCESS;
+}
+
+
+void vboxNetFltOsDeleteInstance(PVBOXNETFLTINS pThis)
+{
+    struct net_device  *pDev;
+    bool                fRegistered;
+    IPRT_LINUX_SAVE_EFL_AC();
+
+#ifdef VBOXNETFLT_WITH_HOST2WIRE_FILTER
+    vboxNetFltLinuxUnhookDev(pThis, NULL);
+#endif
+
+    /** @todo This code may race vboxNetFltLinuxUnregisterDevice (very very
+     *        unlikely, but none the less).  Since it doesn't actually update the
+     *        state (just reads it), it is likely to panic in some interesting
+     *        ways. */
+
+    RTSpinlockAcquire(pThis->hSpinlock);
+    pDev = ASMAtomicUoReadPtrT(&pThis->u.s.pDev, struct net_device *);
+    fRegistered = ASMAtomicXchgBool(&pThis->u.s.fRegistered, false);
+    RTSpinlockRelease(pThis->hSpinlock);
+
+    if (fRegistered)
+    {
+        vboxNetFltSetLinkState(pThis, pDev, false);
+
+#ifndef VBOXNETFLT_LINUX_NO_XMIT_QUEUE
+        skb_queue_purge(&pThis->u.s.XmitQueue);
+#endif
+        Log(("vboxNetFltOsDeleteInstance: this=%p: xmit queue purged.\n", pThis));
+        Log(("vboxNetFltOsDeleteInstance: Device %p(%s) released. ref=%d\n",
+             pDev, pDev->name,
+#if RTLNX_VER_MIN(2,6,37)
+             netdev_refcnt_read(pDev)
+#else
+             atomic_read(&pDev->refcnt)
+#endif
+             ));
+        dev_put(pDev);
+    }
+
+    unregister_inet6addr_notifier(&pThis->u.s.NotifierIPv6);
+    unregister_inetaddr_notifier(&pThis->u.s.NotifierIPv4);
+
+    Log(("vboxNetFltOsDeleteInstance: this=%p: Notifier removed.\n", pThis));
+    unregister_netdevice_notifier(&pThis->u.s.Notifier);
+    module_put(THIS_MODULE);
+
+    IPRT_LINUX_RESTORE_EFL_AC();
+}
+
+
+int  vboxNetFltOsInitInstance(PVBOXNETFLTINS pThis, void *pvContext)
+{
+    int err;
+    IPRT_LINUX_SAVE_EFL_AC();
+    NOREF(pvContext);
+
+    pThis->u.s.Notifier.notifier_call = vboxNetFltLinuxNotifierCallback;
+    err = register_netdevice_notifier(&pThis->u.s.Notifier);
+    if (err)
+    {
+        IPRT_LINUX_RESTORE_EFL_AC();
+        return VERR_INTNET_FLT_IF_FAILED;
+    }
+    if (!pThis->u.s.fRegistered)
+    {
+        unregister_netdevice_notifier(&pThis->u.s.Notifier);
+        LogRel(("VBoxNetFlt: failed to find %s.\n", pThis->szName));
+        IPRT_LINUX_RESTORE_EFL_AC();
+        return VERR_INTNET_FLT_IF_NOT_FOUND;
+    }
+
+    Log(("vboxNetFltOsInitInstance: this=%p: Notifier installed.\n", pThis));
+    if (   pThis->fDisconnectedFromHost
+        || !try_module_get(THIS_MODULE))
+    {
+        IPRT_LINUX_RESTORE_EFL_AC();
+        return VERR_INTNET_FLT_IF_FAILED;
+    }
+
+    if (pThis->pSwitchPort->pfnNotifyHostAddress)
+    {
+        VBOXNETFLTNOTIFIER Enumerator;
+
+        /*
+         * register_inetaddr_notifier() and register_inet6addr_notifier()
+         * do not call the callback for existing devices.  Enumerating
+         * all network devices explicitly is a bit of an ifdef mess,
+         * so co-opt register_netdevice_notifier() to do that for us.
+         */
+        RT_ZERO(Enumerator);
+        Enumerator.Notifier.notifier_call = vboxNetFltLinuxEnumeratorCallback;
+        Enumerator.pThis = pThis;
+
+        err = register_netdevice_notifier(&Enumerator.Notifier);
+        if (err)
+        {
+            LogRel(("%s: failed to enumerate network devices: error %d\n", __FUNCTION__, err));
+            IPRT_LINUX_RESTORE_EFL_AC();
+            return VINF_SUCCESS;
+        }
+
+        unregister_netdevice_notifier(&Enumerator.Notifier);
+
+        pThis->u.s.NotifierIPv4.notifier_call = vboxNetFltLinuxNotifierIPv4Callback;
+        err = register_inetaddr_notifier(&pThis->u.s.NotifierIPv4);
+        if (err)
+            LogRel(("%s: failed to register IPv4 notifier: error %d\n", __FUNCTION__, err));
+
+        pThis->u.s.NotifierIPv6.notifier_call = vboxNetFltLinuxNotifierIPv6Callback;
+        err = register_inet6addr_notifier(&pThis->u.s.NotifierIPv6);
+        if (err)
+            LogRel(("%s: failed to register IPv6 notifier: error %d\n", __FUNCTION__, err));
+    }
+
+    IPRT_LINUX_RESTORE_EFL_AC();
+    return VINF_SUCCESS;
+}
+
+int  vboxNetFltOsPreInitInstance(PVBOXNETFLTINS pThis)
+{
+    IPRT_LINUX_SAVE_EFL_AC();
+
+    /*
+     * Init the linux specific members.
+     */
+    ASMAtomicUoWriteNullPtr(&pThis->u.s.pDev);
+    pThis->u.s.fRegistered     = false;
+    pThis->u.s.fPromiscuousSet = false;
+    pThis->u.s.fPacketHandler  = false;
+    memset(&pThis->u.s.PacketType, 0, sizeof(pThis->u.s.PacketType));
+#ifndef VBOXNETFLT_LINUX_NO_XMIT_QUEUE
+    skb_queue_head_init(&pThis->u.s.XmitQueue);
+# if RTLNX_VER_MIN(2,6,20)
+    INIT_WORK(&pThis->u.s.XmitTask, vboxNetFltLinuxXmitTask);
+# else
+    INIT_WORK(&pThis->u.s.XmitTask, vboxNetFltLinuxXmitTask, &pThis->u.s.XmitTask);
+# endif
+#endif
+
+    IPRT_LINUX_RESTORE_EFL_AC();
+    return VINF_SUCCESS;
+}
+
+
+void vboxNetFltPortOsNotifyMacAddress(PVBOXNETFLTINS pThis, void *pvIfData, PCRTMAC pMac)
+{
+    NOREF(pThis); NOREF(pvIfData); NOREF(pMac);
+}
+
+
+int vboxNetFltPortOsConnectInterface(PVBOXNETFLTINS pThis, void *pvIf, void **pvIfData)
+{
+    /* Nothing to do */
+    NOREF(pThis); NOREF(pvIf); NOREF(pvIfData);
+    return VINF_SUCCESS;
+}
+
+
+int vboxNetFltPortOsDisconnectInterface(PVBOXNETFLTINS pThis, void *pvIfData)
+{
+    /* Nothing to do */
+    NOREF(pThis); NOREF(pvIfData);
+    return VINF_SUCCESS;
+}
+
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/linux/files_vboxnetflt b/src/VBox/HostDrivers/VBoxNetFlt/linux/files_vboxnetflt
new file mode 100755
index 00000000..a9372f51
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/linux/files_vboxnetflt
@@ -0,0 +1,102 @@
+#!/bin/sh
+# $Id: files_vboxnetflt $
+## @file
+# Shared file between Makefile.kmk and export_modules.sh.
+#
+
+#
+# Copyright (C) 2007-2020 Oracle Corporation
+#
+# This file is part of VirtualBox Open Source Edition (OSE), as
+# available from http://www.virtualbox.org. This file is free software;
+# you can redistribute it and/or modify it under the terms of the GNU
+# General Public License (GPL) as published by the Free Software
+# Foundation, in version 2 as it comes in the "COPYING" file of the
+# VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+# hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+#
+# The contents of this file may alternatively be used under the terms
+# of the Common Development and Distribution License Version 1.0
+# (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+# VirtualBox OSE distribution, in which case the provisions of the
+# CDDL are applicable instead of those of the GPL.
+#
+# You may elect to license modified versions of this file under the
+# terms and conditions of either the GPL or the CDDL or both.
+#
+
+VBOX_VBOXNETFLT_SOURCES=" \
+    ${PATH_ROOT}/include/iprt/alloc.h=>include/iprt/alloc.h \
+    ${PATH_ROOT}/include/iprt/alloca.h=>include/iprt/alloca.h \
+    ${PATH_ROOT}/include/iprt/asm.h=>include/iprt/asm.h \
+    ${PATH_ROOT}/include/iprt/asm-amd64-x86.h=>include/iprt/asm-amd64-x86.h \
+    ${PATH_ROOT}/include/iprt/asm-math.h=>include/iprt/asm-math.h \
+    ${PATH_ROOT}/include/iprt/assert.h=>include/iprt/assert.h \
+    ${PATH_ROOT}/include/iprt/assertcompile.h=>include/iprt/assertcompile.h \
+    ${PATH_ROOT}/include/iprt/avl.h=>include/iprt/avl.h \
+    ${PATH_ROOT}/include/iprt/cdefs.h=>include/iprt/cdefs.h \
+    ${PATH_ROOT}/include/iprt/cpuset.h=>include/iprt/cpuset.h \
+    ${PATH_ROOT}/include/iprt/ctype.h=>include/iprt/ctype.h \
+    ${PATH_ROOT}/include/iprt/err.h=>include/iprt/err.h \
+    ${PATH_ROOT}/include/iprt/errcore.h=>include/iprt/errcore.h \
+    ${PATH_ROOT}/include/iprt/heap.h=>include/iprt/heap.h \
+    ${PATH_ROOT}/include/iprt/initterm.h=>include/iprt/initterm.h \
+    ${PATH_ROOT}/include/iprt/latin1.h=>include/iprt/latin1.h \
+    ${PATH_ROOT}/include/iprt/log.h=>include/iprt/log.h \
+    ${PATH_ROOT}/include/iprt/mangling.h=>include/iprt/mangling.h \
+    ${PATH_ROOT}/include/iprt/mem.h=>include/iprt/mem.h \
+    ${PATH_ROOT}/include/iprt/memobj.h=>include/iprt/memobj.h \
+    ${PATH_ROOT}/include/iprt/mp.h=>include/iprt/mp.h \
+    ${PATH_ROOT}/include/iprt/net.h=>include/iprt/net.h \
+    ${PATH_ROOT}/include/iprt/param.h=>include/iprt/param.h \
+    ${PATH_ROOT}/include/iprt/power.h=>include/iprt/power.h \
+    ${PATH_ROOT}/include/iprt/process.h=>include/iprt/process.h \
+    ${PATH_ROOT}/include/iprt/semaphore.h=>include/iprt/semaphore.h \
+    ${PATH_ROOT}/include/iprt/spinlock.h=>include/iprt/spinlock.h \
+    ${PATH_ROOT}/include/iprt/stdarg.h=>include/iprt/stdarg.h \
+    ${PATH_ROOT}/include/iprt/stdint.h=>include/iprt/stdint.h \
+    ${PATH_ROOT}/include/iprt/string.h=>include/iprt/string.h \
+    ${PATH_ROOT}/include/iprt/thread.h=>include/iprt/thread.h \
+    ${PATH_ROOT}/include/iprt/time.h=>include/iprt/time.h \
+    ${PATH_ROOT}/include/iprt/timer.h=>include/iprt/timer.h \
+    ${PATH_ROOT}/include/iprt/types.h=>include/iprt/types.h \
+    ${PATH_ROOT}/include/iprt/uint64.h=>include/iprt/uint64.h \
+    ${PATH_ROOT}/include/iprt/uni.h=>include/iprt/uni.h \
+    ${PATH_ROOT}/include/iprt/utf16.h=>include/iprt/utf16.h \
+    ${PATH_ROOT}/include/iprt/uuid.h=>include/iprt/uuid.h \
+    ${PATH_ROOT}/include/iprt/linux/version.h=>include/iprt/linux/version.h \
+    ${PATH_ROOT}/include/iprt/nocrt/limits.h=>include/iprt/nocrt/limits.h \
+    ${PATH_ROOT}/include/VBox/cdefs.h=>include/VBox/cdefs.h \
+    ${PATH_ROOT}/include/VBox/err.h=>include/VBox/err.h \
+    ${PATH_ROOT}/include/VBox/log.h=>include/VBox/log.h \
+    ${PATH_ROOT}/include/VBox/intnet.h=>include/VBox/intnet.h \
+    ${PATH_ROOT}/include/VBox/intnetinline.h=>include/VBox/intnetinline.h \
+    ${PATH_ROOT}/include/VBox/vmm/pdmnetinline.h=>include/VBox/vmm/pdmnetinline.h \
+    ${PATH_ROOT}/include/VBox/param.h=>include/VBox/param.h \
+    ${PATH_ROOT}/include/VBox/vmm/stam.h=>include/VBox/vmm/stam.h \
+    ${PATH_ROOT}/include/VBox/sup.h=>include/VBox/sup.h \
+    ${PATH_ROOT}/include/VBox/types.h=>include/VBox/types.h \
+    ${PATH_ROOT}/include/VBox/SUPDrvMangling.h=>include/VBox/SUPDrvMangling.h \
+    ${PATH_ROOT}/src/VBox/HostDrivers/VBoxNetFlt/linux/VBoxNetFlt-linux.c=>linux/VBoxNetFlt-linux.c \
+    ${PATH_ROOT}/src/VBox/HostDrivers/VBoxNetFlt/VBoxNetFlt.c=>VBoxNetFlt.c \
+    ${PATH_ROOT}/src/VBox/HostDrivers/VBoxNetFlt/VBoxNetFltInternal.h=>VBoxNetFltInternal.h \
+    ${PATH_ROOT}/src/VBox/HostDrivers/Support/SUPDrvIDC.h=>SUPDrvIDC.h \
+    ${PATH_ROOT}/src/VBox/HostDrivers/Support/SUPR0IdcClient.c=>SUPR0IdcClient.c \
+    ${PATH_ROOT}/src/VBox/HostDrivers/Support/SUPR0IdcClientComponent.c=>SUPR0IdcClientComponent.c \
+    ${PATH_ROOT}/src/VBox/HostDrivers/Support/SUPR0IdcClientInternal.h=>SUPR0IdcClientInternal.h \
+    ${PATH_ROOT}/src/VBox/HostDrivers/Support/linux/SUPR0IdcClient-linux.c=>linux/SUPR0IdcClient-linux.c \
+    ${PATH_ROOT}/src/VBox/Installer/linux/Makefile-footer.gmk=>Makefile-footer.gmk \
+    ${PATH_ROOT}/src/VBox/Installer/linux/Makefile-header.gmk=>Makefile-header.gmk \
+    ${PATH_ROOT}/src/VBox/Runtime/common/math/gcc/divdi3.c=>math/gcc/divdi3.c \
+    ${PATH_ROOT}/src/VBox/Runtime/common/math/gcc/moddi3.c=>math/gcc/moddi3.c \
+    ${PATH_ROOT}/src/VBox/Runtime/common/math/gcc/qdivrem.c=>math/gcc/qdivrem.c \
+    ${PATH_ROOT}/src/VBox/Runtime/common/math/gcc/quad.h=>math/gcc/quad.h \
+    ${PATH_ROOT}/src/VBox/Runtime/common/math/gcc/udivdi3.c=>math/gcc/udivdi3.c \
+    ${PATH_ROOT}/src/VBox/Runtime/common/math/gcc/udivmoddi4.c=>math/gcc/udivmoddi4.c \
+    ${PATH_ROOT}/src/VBox/Runtime/common/math/gcc/umoddi3.c=>math/gcc/umoddi3.c \
+    ${PATH_ROOT}/src/VBox/Runtime/r0drv/linux/the-linux-kernel.h=>r0drv/linux/the-linux-kernel.h \
+    ${PATH_OUT}/version-generated.h=>version-generated.h \
+    ${PATH_OUT}/revision-generated.h=>revision-generated.h \
+    ${PATH_OUT}/product-generated.h=>product-generated.h \
+"
+
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/solaris/VBoxNetFlt-solaris.c b/src/VBox/HostDrivers/VBoxNetFlt/solaris/VBoxNetFlt-solaris.c
new file mode 100644
index 00000000..f50ceaad
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/solaris/VBoxNetFlt-solaris.c
@@ -0,0 +1,4031 @@
+/* $Id: VBoxNetFlt-solaris.c $ */
+/** @file
+ * VBoxNetFlt - Network Filter Driver (Host), Solaris Specific Code.
+ */
+
+/*
+ * Copyright (C) 2008-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP LOG_GROUP_NET_FLT_DRV
+#include <VBox/log.h>
+#include <VBox/err.h>
+#include <VBox/intnetinline.h>
+#include <VBox/version.h>
+#include <iprt/string.h>
+#include <iprt/initterm.h>
+#include <iprt/assert.h>
+#include <iprt/alloca.h>
+#include <iprt/net.h>
+#include <iprt/mem.h>
+#include <iprt/thread.h>
+#include <iprt/spinlock.h>
+#include <iprt/crc.h>
+#include <iprt/err.h>
+#include <iprt/ctype.h>
+#define VBOXNETFLT_SOLARIS_IPV6_POLLING
+#ifdef VBOXNETFLT_SOLARIS_IPV6_POLLING
+# include <iprt/timer.h>
+# include <iprt/time.h>
+#endif
+
+#include <inet/ip.h>
+#include <net/if.h>
+#include <sys/socket.h>
+#include <sys/kstr.h>
+#include <sys/file.h>
+#include <sys/sockio.h>
+#include <sys/strsubr.h>
+#include <sys/pathname.h>
+#include <sys/t_kuser.h>
+
+#include <sys/types.h>
+#include <sys/dlpi.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/param.h>
+#include <sys/ethernet.h>
+#include <sys/stat.h>
+#include <sys/stream.h>
+#include <sys/stropts.h>
+#include <sys/strsun.h>
+#include <sys/modctl.h>
+#include <sys/ddi.h>
+#include <sys/sunddi.h>
+#include <sys/sunldi.h>
+#include <sys/ctf_api.h>
+
+// Workaround for very strange define in sys/user.h
+// #define u       (curproc->p_user)       /* user is now part of proc structure */
+#ifdef u
+#undef u
+#endif
+
+#define VBOXNETFLT_OS_SPECFIC 1
+#include "../VBoxNetFltInternal.h"
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+/** The module name. */
+#define DEVICE_NAME                     "vboxflt"
+/** The module descriptions as seen in 'modinfo'. */
+#define DEVICE_DESC_DRV                 "VirtualBox NetDrv"
+#define DEVICE_DESC_MOD                 "VirtualBox NetMod"
+
+#ifdef VBOXNETFLT_SOLARIS_IPV6_POLLING
+/** Driver properties */
+# define VBOXNETFLT_IP6POLLINTERVAL      "ipv6-pollinterval"
+#endif
+
+/** Maximum loopback packet queue size per interface */
+#define VBOXNETFLT_LOOPBACK_SIZE        32
+
+/** VLAN tag masking, should probably be in IPRT? */
+#define VLAN_ID(vlan)          (((vlan) >>  0) & 0x0fffu)
+#define VLAN_CFI(vlan)         (((vlan) >> 12) & 0x0001u)
+#define VLAN_PRI(vlan)         (((vlan) >> 13) & 0x0007u)
+#define VLAN_TAG(pri,cfi,vid)  (((pri) << 13) | ((cfi) << 12) | ((vid) << 0))
+
+typedef struct VLANHEADER
+{
+    uint16_t Type;
+    uint16_t Data;
+} VLANHEADER;
+typedef struct VLANHEADER *PVLANHEADER;
+
+
+/*********************************************************************************************************************************
+*   Global Functions                                                                                                             *
+*********************************************************************************************************************************/
+/**
+ * Stream Driver hooks.
+ */
+static int VBoxNetFltSolarisGetInfo(dev_info_t *pDip, ddi_info_cmd_t enmCmd, void *pArg, void **ppvResult);
+static int VBoxNetFltSolarisAttach(dev_info_t *pDip, ddi_attach_cmd_t enmCmd);
+static int VBoxNetFltSolarisDetach(dev_info_t *pDip, ddi_detach_cmd_t enmCmd);
+static int VBoxNetFltSolarisQuiesceNotNeeded(dev_info_t *pDip);
+
+/**
+ * Stream Module hooks.
+ */
+static int VBoxNetFltSolarisModOpen(queue_t *pQueue, dev_t *pDev, int fFile, int fStream, cred_t *pCred);
+static int VBoxNetFltSolarisModClose(queue_t *pQueue, int fFile, cred_t *pCred);
+static int VBoxNetFltSolarisModReadPut(queue_t *pQueue, mblk_t *pMsg);
+static int VBoxNetFltSolarisModWritePut(queue_t *pQueue, mblk_t *pMsg);
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/**
+ * Streams: module info.
+ */
+static struct module_info g_VBoxNetFltSolarisModInfo =
+{
+    0xbad,                          /* module id */
+    DEVICE_NAME,
+    0,                              /* min. packet size */
+    INFPSZ,                         /* max. packet size */
+    0,                              /* hi-water mark */
+    0                               /* lo-water mark */
+};
+
+/**
+ * Streams: read queue hooks.
+ */
+static struct qinit g_VBoxNetFltSolarisReadQ =
+{
+    VBoxNetFltSolarisModReadPut,
+    NULL,                           /* service */
+    VBoxNetFltSolarisModOpen,
+    VBoxNetFltSolarisModClose,
+    NULL,                           /* admin (reserved) */
+    &g_VBoxNetFltSolarisModInfo,
+    NULL                            /* module stats */
+};
+
+/**
+ * Streams: write queue hooks.
+ */
+static struct qinit g_VBoxNetFltSolarisWriteQ =
+{
+    VBoxNetFltSolarisModWritePut,
+    NULL,                           /* service */
+    NULL,                           /* open */
+    NULL,                           /* close */
+    NULL,                           /* admin (reserved) */
+    &g_VBoxNetFltSolarisModInfo,
+    NULL                            /* module stats */
+};
+
+/**
+ * Streams: IO stream tab.
+ */
+static struct streamtab g_VBoxNetFltSolarisStreamTab =
+{
+    &g_VBoxNetFltSolarisReadQ,
+    &g_VBoxNetFltSolarisWriteQ,
+    NULL,                           /* muxread init */
+    NULL                            /* muxwrite init */
+};
+
+/**
+ * cb_ops: driver char/block entry points
+ */
+static struct cb_ops g_VBoxNetFltSolarisCbOps =
+{
+    nulldev,                        /* cb open */
+    nulldev,                        /* cb close */
+    nodev,                          /* b strategy */
+    nodev,                          /* b dump */
+    nodev,                          /* b print */
+    nodev,                          /* cb read */
+    nodev,                          /* cb write */
+    nodev,                          /* cb ioctl */
+    nodev,                          /* c devmap */
+    nodev,                          /* c mmap */
+    nodev,                          /* c segmap */
+    nochpoll,                       /* c poll */
+    ddi_prop_op,                    /* property ops */
+    &g_VBoxNetFltSolarisStreamTab,
+    D_NEW | D_MP | D_MTQPAIR | D_MTOUTPERIM | D_MTOCEXCL, /* compat. flag */
+    CB_REV                          /* revision */
+};
+
+/**
+ * dev_ops: driver entry/exit and other ops.
+ */
+static struct dev_ops g_VBoxNetFltSolarisDevOps =
+{
+    DEVO_REV,                       /* driver build revision */
+    0,                              /* ref count */
+    VBoxNetFltSolarisGetInfo,
+    nulldev,                        /* identify */
+    nulldev,                        /* probe */
+    VBoxNetFltSolarisAttach,
+    VBoxNetFltSolarisDetach,
+    nodev,                          /* reset */
+    &g_VBoxNetFltSolarisCbOps,
+    (struct bus_ops *)0,
+    nodev,                          /* power */
+    VBoxNetFltSolarisQuiesceNotNeeded
+};
+
+/**
+ * modldrv: export driver specifics to kernel
+ */
+static struct modldrv g_VBoxNetFltSolarisDriver =
+{
+    &mod_driverops,                 /* extern from kernel */
+    DEVICE_DESC_DRV " " VBOX_VERSION_STRING "r" RT_XSTR(VBOX_SVN_REV),
+    &g_VBoxNetFltSolarisDevOps
+};
+
+/**
+ * fmodsw: streams module ops
+ */
+static struct fmodsw g_VBoxNetFltSolarisModOps =
+{
+    DEVICE_NAME,
+    &g_VBoxNetFltSolarisStreamTab,
+    D_NEW | D_MP | D_MTQPAIR | D_MTOUTPERIM | D_MTOCEXCL
+};
+
+/**
+ * modlstrmod: streams module specifics to kernel
+ */
+static struct modlstrmod g_VBoxNetFltSolarisModule =
+{
+    &mod_strmodops,                 /* extern from kernel */
+    DEVICE_DESC_MOD " " VBOX_VERSION_STRING "r" RT_XSTR(VBOX_SVN_REV),
+    &g_VBoxNetFltSolarisModOps
+};
+
+/**
+ * modlinkage: export install/remove/info to the kernel
+ */
+static struct modlinkage g_VBoxNetFltSolarisModLinkage =
+{
+    MODREV_1,                        /* loadable module system revision */
+    {
+        &g_VBoxNetFltSolarisDriver,  /* streams driver framework */
+        &g_VBoxNetFltSolarisModule,  /* streams module framework */
+        NULL                         /* terminate array of linkage structures */
+    }
+};
+
+struct vboxnetflt_state_t;
+
+/**
+ * vboxnetflt_dladdr_t: DL SAP address format
+ */
+typedef struct vboxnetflt_dladdr_t
+{
+    ether_addr_t Mac;
+    uint16_t SAP;
+} vboxnetflt_dladdr_t;
+
+#define VBOXNETFLT_DLADDRL        sizeof(vboxnetflt_dladdr_t)
+
+/**
+ * which stream is this?
+ */
+typedef enum VBOXNETFLTSTREAMTYPE
+{
+    kUndefined = 0,
+    kIp4Stream = 0x1b,
+    kIp6Stream = 0xcc,
+    kArpStream = 0xab,
+    kPromiscStream = 0xdf
+} VBOXNETFLTSTREAMTYPE;
+
+/**
+ * loopback packet identifier
+ */
+typedef struct VBOXNETFLTPACKETID
+{
+    struct VBOXNETFLTPACKETID *pNext;
+    uint16_t cbPacket;
+    uint16_t Checksum;
+    RTMAC SrcMac;
+    RTMAC DstMac;
+} VBOXNETFLTPACKETID;
+typedef struct VBOXNETFLTPACKETID *PVBOXNETFLTPACKETID;
+
+/**
+ * vboxnetflt_stream_t: per-stream data (multiple streams per interface)
+ */
+typedef struct vboxnetflt_stream_t
+{
+    int DevMinor;                         /* minor device no. (for clone) */
+    queue_t *pReadQueue;                  /* read side queue */
+    struct vboxnetflt_stream_t *pNext;    /* next stream in list */
+    PVBOXNETFLTINS volatile pThis;        /* the backend instance */
+    VBOXNETFLTSTREAMTYPE Type;            /* the type of the stream */
+} vboxnetflt_stream_t;
+
+/**
+ * vboxnetflt_promisc_stream_t: per-interface dedicated stream data
+ */
+typedef struct vboxnetflt_promisc_stream_t
+{
+    vboxnetflt_stream_t Stream;           /* dedicated/promiscuous stream */
+    bool fPromisc;                        /* cached promiscuous value */
+    bool fRawMode;                        /* whether raw mode request was successful */
+    uint32_t ModeReqId;                   /* track MIOCTLs for swallowing our fake request acknowledgements */
+#ifdef VBOXNETFLT_SOLARIS_IPV6_POLLING
+    PRTTIMER pIp6Timer;                   /* ipv6 stream poll timer for dynamic ipv6 stream attachment */
+#endif
+    size_t cLoopback;                     /* loopback queue size list */
+    timeout_id_t volatile TimeoutId;      /* timeout id of promisc. req */
+    PVBOXNETFLTPACKETID pHead;            /* loopback packet identifier head */
+    PVBOXNETFLTPACKETID pTail;            /* loopback packet identifier tail */
+} vboxnetflt_promisc_stream_t;
+
+typedef struct vboxnetflt_promisc_params_t
+{
+    PVBOXNETFLTINS pThis;                 /* the backend instance */
+    bool fPromiscOn;                      /* whether promiscuous req. on or off */
+} vboxnetflt_promisc_params_t;
+
+
+/*********************************************************************************************************************************
+*   Internal Functions                                                                                                           *
+*********************************************************************************************************************************/
+static int vboxNetFltSolarisSetRawMode(vboxnetflt_promisc_stream_t *pPromiscStream);
+/* static int vboxNetFltSolarisSetFastMode(queue_t *pQueue); */
+
+static int vboxNetFltSolarisPhysAddrReq(queue_t *pQueue);
+static void vboxNetFltSolarisCachePhysAddr(PVBOXNETFLTINS pThis, mblk_t *pPhysAddrAckMsg);
+static int vboxNetFltSolarisBindReq(queue_t *pQueue, int SAP);
+static int vboxNetFltSolarisNotifyReq(queue_t *pQueue);
+
+/*  static int vboxNetFltSolarisUnitDataToRaw(PVBOXNETFLTINS pThis, mblk_t *pMsg, mblk_t **ppRawMsg); */
+static int vboxNetFltSolarisRawToUnitData(mblk_t *pMsg, mblk_t **ppDlpiMsg);
+
+static inline void vboxNetFltSolarisInitPacketId(PVBOXNETFLTPACKETID pTag, mblk_t *pMsg);
+static int vboxNetFltSolarisQueueLoopback(PVBOXNETFLTINS pThis, vboxnetflt_promisc_stream_t *pPromiscStream, mblk_t *pMsg);
+static bool vboxNetFltSolarisIsOurMBlk(PVBOXNETFLTINS pThis, vboxnetflt_promisc_stream_t *pPromiscStream, mblk_t *pMsg);
+
+static mblk_t *vboxNetFltSolarisMBlkFromSG(PVBOXNETFLTINS pThis, PINTNETSG pSG, uint32_t fDst);
+static unsigned vboxNetFltSolarisMBlkCalcSGSegs(PVBOXNETFLTINS pThis, mblk_t *pMsg);
+static int vboxNetFltSolarisMBlkToSG(PVBOXNETFLTINS pThis, mblk_t *pMsg, PINTNETSG pSG, unsigned cSegs, uint32_t fSrc);
+static int vboxNetFltSolarisRecv(PVBOXNETFLTINS pThis, vboxnetflt_stream_t *pStream, queue_t *pQueue, mblk_t *pMsg);
+/* static mblk_t *vboxNetFltSolarisFixChecksums(mblk_t *pMsg); */
+/* static void vboxNetFltSolarisAnalyzeMBlk(mblk_t *pMsg); */
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+/** Global device info handle. */
+static dev_info_t *g_pVBoxNetFltSolarisDip = NULL;
+
+/** The (common) global data. */
+static VBOXNETFLTGLOBALS g_VBoxNetFltSolarisGlobals;
+
+/** The list of all opened streams. */
+vboxnetflt_stream_t *g_VBoxNetFltSolarisStreams = NULL;
+
+/** Global mutex protecting open/close. */
+static RTSEMFASTMUTEX g_VBoxNetFltSolarisMtx = NIL_RTSEMFASTMUTEX;
+
+/** Global credentials using during open/close. */
+static cred_t *g_pVBoxNetFltSolarisCred = NULL;
+
+/**
+ * g_VBoxNetFltInstance is the current PVBOXNETFLTINS to be associated with the stream being created
+ * in ModOpen. This is just shared global data between the dynamic attach and the ModOpen procedure.
+ */
+PVBOXNETFLTINS volatile g_VBoxNetFltSolarisInstance = NULL;
+
+/** Goes along with the instance to determine type of stream being opened/created. */
+VBOXNETFLTSTREAMTYPE volatile g_VBoxNetFltSolarisStreamType = kUndefined;
+
+#ifdef VBOXNETFLT_SOLARIS_IPV6_POLLING
+/** Global IPv6 polling interval */
+static int g_VBoxNetFltSolarisPollInterval = -1;
+#endif
+
+static int s_off_vnode = -1;
+#define VNODE_FOR_FILE_T(filetpointer)         (*(struct vnode **)((char *)(filetpointer) + s_off_vnode))
+
+
+static int
+vboxNetFltSolarisCtfGetMemberOffset(ctf_file_t *pCtfFile, const char *pszStruct, const char *pszMember, int *pOffset)
+{
+    AssertReturn(pCtfFile, VERR_INVALID_PARAMETER);
+    AssertReturn(pszStruct, VERR_INVALID_PARAMETER);
+    AssertReturn(pszMember, VERR_INVALID_PARAMETER);
+    AssertReturn(pOffset, VERR_INVALID_PARAMETER);
+
+    ctf_id_t TypeId = ctf_lookup_by_name(pCtfFile, pszStruct);
+    if (TypeId != CTF_ERR)
+    {
+        ctf_membinfo_t MemberInfo;
+        bzero(&MemberInfo, sizeof(MemberInfo));
+        if (ctf_member_info(pCtfFile, TypeId, pszMember, &MemberInfo) != CTF_ERR)
+        {
+            *pOffset = (MemberInfo.ctm_offset >> 3);
+            LogRel((DEVICE_NAME ":%s::%s at %d\n", pszStruct, pszMember, *pOffset));
+            return VINF_SUCCESS;
+        }
+        else
+            LogRel((DEVICE_NAME ":ctf_member_info failed for struct %s member %s\n", pszStruct, pszMember));
+    }
+    else
+        LogRel((DEVICE_NAME ":ctf_lookup_by_name failed for struct %s\n", pszStruct));
+
+    return VERR_NOT_FOUND;
+}
+
+
+static int
+vboxNetFltSolarisProbeCtf(void)
+{
+    /*
+     * CTF probing for fluid f_vnode member in file_t.
+     */
+    int rc = VERR_INTERNAL_ERROR;
+    modctl_t *pModCtl = mod_hold_by_name("genunix");
+    if (pModCtl)
+    {
+        int err;
+        mutex_enter(&mod_lock);
+        ctf_file_t *pCtfFile = ctf_modopen(pModCtl->mod_mp, &err);
+        mutex_exit(&mod_lock);
+        if (pCtfFile)
+        {
+            rc = vboxNetFltSolarisCtfGetMemberOffset(pCtfFile, "file_t", "f_vnode", &s_off_vnode);
+            ctf_close(pCtfFile);
+        }
+        else
+            LogRel((DEVICE_NAME ":ctf_modopen failed. err=%d\n", err));
+
+        mod_release_mod(pModCtl);
+    }
+    else
+        LogRel((DEVICE_NAME ":mod_hold_by_name failed.\n"));
+
+    return rc;
+}
+
+
+/**
+ * Kernel entry points
+ */
+int _init(void)
+{
+    LogFunc((DEVICE_NAME ":_init\n"));
+
+    /*
+     * Prevent module autounloading.
+     */
+    modctl_t *pModCtl = mod_getctl(&g_VBoxNetFltSolarisModLinkage);
+    if (pModCtl)
+        pModCtl->mod_loadflags |= MOD_NOAUTOUNLOAD;
+    else
+        LogRel((DEVICE_NAME ":failed to disable autounloading!\n"));
+
+    /*
+     * Initialize IPRT.
+     */
+    int rc = RTR0Init(0);
+    if (RT_SUCCESS(rc))
+    {
+        rc = vboxNetFltSolarisProbeCtf();
+        if (RT_SUCCESS(rc))
+        {
+            /*
+             * Initialize Solaris specific globals here.
+             */
+            g_VBoxNetFltSolarisStreams = NULL;
+            g_VBoxNetFltSolarisInstance = NULL;
+            g_pVBoxNetFltSolarisCred = crdup(kcred);
+            if (RT_LIKELY(g_pVBoxNetFltSolarisCred))
+            {
+                rc = RTSemFastMutexCreate(&g_VBoxNetFltSolarisMtx);
+                if (RT_SUCCESS(rc))
+                {
+                    /*
+                     * Initialize the globals and connect to the support driver.
+                     *
+                     * This will call back vboxNetFltOsOpenSupDrv (and maybe vboxNetFltOsCloseSupDrv)
+                     * for establishing the connect to the support driver.
+                     */
+                    memset(&g_VBoxNetFltSolarisGlobals, 0, sizeof(g_VBoxNetFltSolarisGlobals));
+                    rc = vboxNetFltInitGlobalsAndIdc(&g_VBoxNetFltSolarisGlobals);
+                    if (RT_SUCCESS(rc))
+                    {
+                        rc = mod_install(&g_VBoxNetFltSolarisModLinkage);
+                        if (!rc)
+                            return rc;
+
+                        LogRel((DEVICE_NAME ":mod_install failed. rc=%d\n", rc));
+                        vboxNetFltTryDeleteIdcAndGlobals(&g_VBoxNetFltSolarisGlobals);
+                    }
+                    else
+                        LogRel((DEVICE_NAME ":failed to initialize globals.\n"));
+
+                    RTSemFastMutexDestroy(g_VBoxNetFltSolarisMtx);
+                    g_VBoxNetFltSolarisMtx = NIL_RTSEMFASTMUTEX;
+                }
+            }
+            else
+            {
+                LogRel((DEVICE_NAME ":failed to allocate credentials.\n"));
+                rc = VERR_NO_MEMORY;
+            }
+        }
+        else
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisProbeCtf failed. rc=%d\n", rc));
+
+        RTR0Term();
+    }
+    else
+        LogRel((DEVICE_NAME ":failed to initialize IPRT (rc=%d)\n", rc));
+
+    memset(&g_VBoxNetFltSolarisGlobals, 0, sizeof(g_VBoxNetFltSolarisGlobals));
+    return RTErrConvertToErrno(rc);
+}
+
+
+int _fini(void)
+{
+    int rc;
+    LogFunc((DEVICE_NAME ":_fini\n"));
+
+    /*
+     * Undo the work done during start (in reverse order).
+     */
+    rc = vboxNetFltTryDeleteIdcAndGlobals(&g_VBoxNetFltSolarisGlobals);
+    if (RT_FAILURE(rc))
+    {
+        LogRel((DEVICE_NAME ":_fini - busy!\n"));
+        return EBUSY;
+    }
+
+    rc = mod_remove(&g_VBoxNetFltSolarisModLinkage);
+    if (!rc)
+    {
+        if (g_pVBoxNetFltSolarisCred)
+        {
+            crfree(g_pVBoxNetFltSolarisCred);
+            g_pVBoxNetFltSolarisCred = NULL;
+        }
+
+        if (g_VBoxNetFltSolarisMtx != NIL_RTSEMFASTMUTEX)
+        {
+            RTSemFastMutexDestroy(g_VBoxNetFltSolarisMtx);
+            g_VBoxNetFltSolarisMtx = NIL_RTSEMFASTMUTEX;
+        }
+
+        RTR0Term();
+    }
+
+    return rc;
+}
+
+
+int _info(struct modinfo *pModInfo)
+{
+    LogFunc((DEVICE_NAME ":_info\n"));
+
+    int rc = mod_info(&g_VBoxNetFltSolarisModLinkage, pModInfo);
+
+    Log((DEVICE_NAME ":_info returns %d\n", rc));
+    return rc;
+}
+
+
+/**
+ * Attach entry point, to attach a device to the system or resume it.
+ *
+ * @param   pDip            The module structure instance.
+ * @param   enmCmd          Operation type (attach/resume).
+ *
+ * @returns corresponding solaris error code.
+ */
+static int VBoxNetFltSolarisAttach(dev_info_t *pDip, ddi_attach_cmd_t enmCmd)
+{
+    LogFunc((DEVICE_NAME ":VBoxNetFltSolarisAttach pDip=%p enmCmd=%d\n", pDip, enmCmd));
+
+    switch (enmCmd)
+    {
+        case DDI_ATTACH:
+        {
+            int instance = ddi_get_instance(pDip);
+            int rc = ddi_create_minor_node(pDip, DEVICE_NAME, S_IFCHR, instance, DDI_PSEUDO, CLONE_DEV);
+            if (rc == DDI_SUCCESS)
+            {
+                g_pVBoxNetFltSolarisDip = pDip;
+#ifdef VBOXNETFLT_SOLARIS_IPV6_POLLING
+                /*
+                 * Get the user prop. for polling interval.
+                 */
+                int Interval = ddi_getprop(DDI_DEV_T_ANY, pDip, DDI_PROP_DONTPASS, VBOXNETFLT_IP6POLLINTERVAL, -1 /* default */);
+                if (Interval == -1)
+                    Log((DEVICE_NAME ":vboxNetFltSolarisSetupIp6Polling: no poll interval property specified. Skipping Ipv6 polling.\n"));
+                else if (Interval < 1 || Interval > 120)
+                {
+                    LogRel((DEVICE_NAME ":vboxNetFltSolarisSetupIp6Polling: Invalid polling interval %d. Expected between 1 and 120 secs.\n",
+                                        Interval));
+                    Interval = -1;
+                }
+
+                g_VBoxNetFltSolarisPollInterval = Interval;
+#endif
+                ddi_report_dev(pDip);
+                return DDI_SUCCESS;
+            }
+            else
+                LogRel((DEVICE_NAME ":VBoxNetFltSolarisAttach failed to create minor node. rc%d\n", rc));
+            return DDI_FAILURE;
+        }
+
+        case DDI_RESUME:
+        {
+            /* Nothing to do here... */
+            return DDI_SUCCESS;
+        }
+
+        /* case DDI_PM_RESUME: */
+        default:
+            return DDI_FAILURE;
+    }
+}
+
+
+/**
+ * Detach entry point, to detach a device to the system or suspend it.
+ *
+ * @param   pDip            The module structure instance.
+ * @param   enmCmd          Operation type (detach/suspend).
+ *
+ * @returns corresponding solaris error code.
+ */
+static int VBoxNetFltSolarisDetach(dev_info_t *pDip, ddi_detach_cmd_t enmCmd)
+{
+    LogFunc((DEVICE_NAME ":VBoxNetFltSolarisDetach pDip=%p enmCmd=%d\n", pDip, enmCmd));
+
+    switch (enmCmd)
+    {
+        case DDI_DETACH:
+        {
+            ddi_remove_minor_node(pDip, NULL);
+            return DDI_SUCCESS;
+        }
+
+        case DDI_RESUME:
+        {
+            /* Nothing to do here... */
+            return DDI_SUCCESS;
+        }
+
+        /* case DDI_PM_SUSPEND: */
+        /* case DDI_HOT_PLUG_DETACH: */
+        default:
+            return DDI_FAILURE;
+    }
+}
+
+
+/**
+ * Quiesce not-needed entry point, as Solaris 10 doesn't have any
+ * ddi_quiesce_not_needed() function.
+ *
+ * @param   pDip            The module structure instance.
+ *
+ * @return  corresponding solaris error code.
+ */
+static int VBoxNetFltSolarisQuiesceNotNeeded(dev_info_t *pDip)
+{
+    return DDI_SUCCESS;
+}
+
+
+/**
+ * Info entry point, called by solaris kernel for obtaining driver info.
+ *
+ * @param   pDip            The module structure instance (do not use).
+ * @param   enmCmd          Information request type.
+ * @param   pvArg           Type specific argument.
+ * @param   ppvResult       Where to store the requested info.
+ *
+ * @returns  corresponding solaris error code.
+ */
+static int VBoxNetFltSolarisGetInfo(dev_info_t *pDip, ddi_info_cmd_t enmCmd, void *pvArg, void **ppvResult)
+{
+    LogFunc((DEVICE_NAME ":VBoxNetFltSolarisGetInfo pDip=%p enmCmd=%d pArg=%p instance=%d\n", pDip, enmCmd,
+                getminor((dev_t)pvArg)));
+
+    switch (enmCmd)
+    {
+        case DDI_INFO_DEVT2DEVINFO:
+        {
+            *ppvResult = g_pVBoxNetFltSolarisDip;
+            return DDI_SUCCESS;
+        }
+
+        case DDI_INFO_DEVT2INSTANCE:
+        {
+            int instance = getminor((dev_t)pvArg);
+            *ppvResult = (void *)(uintptr_t)instance;
+            return DDI_SUCCESS;
+        }
+    }
+
+    return DDI_FAILURE;
+}
+
+
+/**
+ * Stream module open entry point, initializes the queue and allows streams processing.
+ *
+ * @param   pQueue          Pointer to the read queue (cannot be NULL).
+ * @param   pDev            Pointer to the dev_t associated with the driver at the end of the stream.
+ * @param   fOpenMode       Open mode (always 0 for streams driver, thus ignored).
+ * @param   fStreamMode     Stream open mode.
+ * @param   pCred           Pointer to user credentials.
+ *
+ * @returns corresponding solaris error code.
+ */
+static int VBoxNetFltSolarisModOpen(queue_t *pQueue, dev_t *pDev, int fOpenMode, int fStreamMode, cred_t *pCred)
+{
+    Assert(pQueue);
+
+    LogFunc((DEVICE_NAME ":VBoxNetFltSolarisModOpen pQueue=%p pDev=%p fOpenMode=%d fStreamMode=%d\n", pQueue, pDev,
+            fOpenMode, fStreamMode));
+
+    /*
+     * Already open?
+     */
+    if (pQueue->q_ptr)
+    {
+        LogRel((DEVICE_NAME ":VBoxNetFltSolarisModOpen invalid open.\n"));
+        return ENOENT;
+    }
+
+    /*
+     * Check that the request was initiated by our code.
+     *
+     * This ASSUMES that crdup() will return a copy with a unique address and
+     * not do any kind of clever pooling.  This check will when combined with
+     * g_VBoxNetFltSolarisMtx prevent races and that the instance gets
+     * associated with the wrong streams.
+     */
+    if (pCred != g_pVBoxNetFltSolarisCred)
+    {
+        LogRel((DEVICE_NAME ":VBoxNetFltSolarisModOpen invalid credentials.\n"));
+        return EACCES;
+    }
+
+    /*
+     * Check for the VirtualBox instance.
+     */
+    PVBOXNETFLTINS pThis = g_VBoxNetFltSolarisInstance;
+    if (!pThis)
+    {
+        LogRel((DEVICE_NAME ":VBoxNetFltSolarisModOpen failed to get VirtualBox instance.\n"));
+        return ENOENT;
+    }
+
+    /*
+     * Check VirtualBox stream type.
+     */
+    if (   g_VBoxNetFltSolarisStreamType != kPromiscStream
+        && g_VBoxNetFltSolarisStreamType != kArpStream
+        && g_VBoxNetFltSolarisStreamType != kIp6Stream
+        && g_VBoxNetFltSolarisStreamType != kIp4Stream)
+    {
+        LogRel((DEVICE_NAME ":VBoxNetFltSolarisModOpen failed due to undefined VirtualBox open mode. Type=%d\n",
+                g_VBoxNetFltSolarisStreamType));
+        return ENOENT;
+    }
+
+    /*
+     * Get minor number. For clone opens provide a new dev_t.
+     */
+    minor_t DevMinor = 0;
+    vboxnetflt_stream_t *pStream = NULL;
+    vboxnetflt_stream_t **ppPrevStream = &g_VBoxNetFltSolarisStreams;
+    if (fStreamMode == CLONEOPEN)
+    {
+        for (; (pStream = *ppPrevStream) != NULL; ppPrevStream = &pStream->pNext)
+        {
+            if (DevMinor < pStream->DevMinor)
+                break;
+            DevMinor++;
+        }
+        *pDev = makedevice(getmajor(*pDev), DevMinor);
+    }
+    else
+        DevMinor = getminor(*pDev);
+
+    if (g_VBoxNetFltSolarisStreamType == kPromiscStream)
+    {
+        vboxnetflt_promisc_stream_t *pPromiscStream = RTMemAlloc(sizeof(vboxnetflt_promisc_stream_t));
+        if (RT_UNLIKELY(!pPromiscStream))
+        {
+            LogRel((DEVICE_NAME ":VBoxNetFltSolarisModOpen failed to allocate promiscuous stream data.\n"));
+            return ENOMEM;
+        }
+
+        pPromiscStream->fPromisc = false;
+        pPromiscStream->fRawMode = false;
+        pPromiscStream->ModeReqId = 0;
+        pPromiscStream->pHead = NULL;
+        pPromiscStream->pTail = NULL;
+        pPromiscStream->cLoopback = 0;
+        pPromiscStream->TimeoutId = 0;
+#ifdef VBOXNETFLT_SOLARIS_IPV6_POLLING
+        pPromiscStream->pIp6Timer = NULL;
+#endif
+        pStream = (vboxnetflt_stream_t *)pPromiscStream;
+    }
+    else
+    {
+        /*
+         * Allocate & initialize per-stream data. Hook it into the (read and write) queue's module specific data.
+         */
+        pStream = RTMemAlloc(sizeof(vboxnetflt_stream_t));
+        if (RT_UNLIKELY(!pStream))
+        {
+            LogRel((DEVICE_NAME ":VBoxNetFltSolarisModOpen failed to allocate stream data.\n"));
+            return ENOMEM;
+        }
+    }
+    pStream->DevMinor = DevMinor;
+    pStream->pReadQueue = pQueue;
+
+    /*
+     * Pick up the current global VBOXNETFLTINS instance as
+     * the one that we will associate this stream with.
+     */
+    ASMAtomicUoWritePtr(&pStream->pThis, pThis);
+    pStream->Type = g_VBoxNetFltSolarisStreamType;
+    switch (pStream->Type)
+    {
+        case kIp4Stream:        ASMAtomicUoWritePtr((void**)&pThis->u.s.pIp4Stream, pStream);        break;
+        case kIp6Stream:        ASMAtomicUoWritePtr((void**)&pThis->u.s.pIp6Stream, pStream);        break;
+        case kArpStream:        ASMAtomicUoWritePtr((void**)&pThis->u.s.pArpStream, pStream);        break;
+        case kPromiscStream:    ASMAtomicUoWritePtr((void**)&pThis->u.s.pPromiscStream, pStream);    break;
+        default:    /* Heh. */
+        {
+            LogRel((DEVICE_NAME ":VBoxNetFltSolarisModOpen huh!? Invalid stream type %d\n", pStream->Type));
+            RTMemFree(pStream);
+            return EINVAL;
+        }
+    }
+
+    pQueue->q_ptr = pStream;
+    WR(pQueue)->q_ptr = pStream;
+
+    /*
+     * Link it to the list of streams.
+     */
+    pStream->pNext = *ppPrevStream;
+    *ppPrevStream = pStream;
+
+    /*
+     * Increment IntNet reference count for this stream.
+     */
+    vboxNetFltRetain(pThis, false /* fBusy */);
+
+    qprocson(pQueue);
+
+    /*
+     * Don't hold the spinlocks across putnext calls as it could
+     * (and does mostly) re-enter the put procedure on the same thread.
+     */
+    if (pStream->Type == kPromiscStream)
+    {
+        vboxnetflt_promisc_stream_t *pPromiscStream = (vboxnetflt_promisc_stream_t *)pStream;
+
+        /*
+         * Bind to SAP 0 (DL_ETHER).
+         * Note: We don't support DL_TPR (token passing ring) SAP as that is unnecessary asynchronous
+         * work to get DL_INFO_REQ acknowledgements and determine SAP based on the Mac Type etc.
+         * Besides TPR doesn't really exist anymore practically as far as I know.
+         */
+        int rc = vboxNetFltSolarisBindReq(pStream->pReadQueue, 0 /* SAP */);
+        if (RT_LIKELY(RT_SUCCESS(rc)))
+        {
+            /*
+             * Request the physical address (we cache the acknowledgement).
+             */
+            rc = vboxNetFltSolarisPhysAddrReq(pStream->pReadQueue);
+            if (RT_LIKELY(RT_SUCCESS(rc)))
+            {
+                /*
+                 * Ask for DLPI link notifications, don't bother check for errors here.
+                 */
+                vboxNetFltSolarisNotifyReq(pStream->pReadQueue);
+
+                /*
+                 * Enable raw mode.
+                 */
+                rc = vboxNetFltSolarisSetRawMode(pPromiscStream);
+                if (RT_FAILURE(rc))
+                    LogRel((DEVICE_NAME ":vboxNetFltSolarisSetRawMode failed rc=%Rrc.\n", rc));
+            }
+            else
+                LogRel((DEVICE_NAME ":vboxNetFltSolarisSetRawMode failed rc=%Rrc.\n", rc));
+        }
+        else
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisBindReq failed rc=%Rrc.\n", rc));
+    }
+
+    NOREF(fOpenMode);
+
+    Log((DEVICE_NAME ":VBoxNetFltSolarisModOpen returns 0, DevMinor=%d pQueue=%p\n", DevMinor, pStream->pReadQueue));
+
+    return 0;
+}
+
+
+/**
+ * Stream module close entry point, undoes the work done on open and closes the stream.
+ *
+ * @param   pQueue          Pointer to the read queue (cannot be NULL).
+ * @param   fOpenMode       Open mode (always 0 for streams driver, thus ignored).
+ * @param   pCred           Pointer to user credentials.
+ *
+ * @returns  corresponding solaris error code.
+ */
+static int VBoxNetFltSolarisModClose(queue_t *pQueue, int fOpenMode, cred_t *pCred)
+{
+    Assert(pQueue);
+
+    LogFunc((DEVICE_NAME ":VBoxNetFltSolarisModClose pQueue=%p fOpenMode=%d\n", pQueue, fOpenMode));
+
+    vboxnetflt_stream_t *pStream = NULL;
+    vboxnetflt_stream_t **ppPrevStream = NULL;
+
+    /*
+     * Get instance data.
+     */
+    pStream = (vboxnetflt_stream_t *)pQueue->q_ptr;
+    if (RT_UNLIKELY(!pStream))
+    {
+        LogRel((DEVICE_NAME ":VBoxNetFltSolarisModClose failed to get stream.\n"));
+        return ENXIO;
+    }
+
+    if (pStream->Type == kPromiscStream)
+    {
+        /*
+         * If there are any timeout scheduled, we need to make sure they are cancelled.
+         */
+        vboxnetflt_promisc_stream_t *pPromiscStream = (vboxnetflt_promisc_stream_t *)pStream;
+        timeout_id_t TimeoutId = ASMAtomicReadPtr(&pPromiscStream->TimeoutId);
+        if (TimeoutId)
+        {
+            quntimeout(WR(pPromiscStream->Stream.pReadQueue), TimeoutId);
+            ASMAtomicWritePtr(&pPromiscStream->TimeoutId, NULL);
+        }
+
+        flushq(pQueue, FLUSHALL);
+        flushq(WR(pQueue), FLUSHALL);
+    }
+
+    qprocsoff(pQueue);
+
+    if (pStream->Type == kPromiscStream)
+    {
+        vboxnetflt_promisc_stream_t *pPromiscStream = (vboxnetflt_promisc_stream_t *)pStream;
+
+        mutex_enter(&pStream->pThis->u.s.hMtx);
+
+        /*
+         * Free-up loopback buffers.
+         */
+        PVBOXNETFLTPACKETID pCur = pPromiscStream->pHead;
+        while (pCur)
+        {
+            PVBOXNETFLTPACKETID pNext = pCur->pNext;
+            RTMemFree(pCur);
+            pCur = pNext;
+        }
+        pPromiscStream->pHead = NULL;
+        pPromiscStream->pTail = NULL;
+        pPromiscStream->cLoopback = 0;
+
+#ifdef VBOXNETFLT_SOLARIS_IPV6_POLLING
+        /*
+         * Sheer paranoia.
+         */
+        if (pPromiscStream->pIp6Timer != NULL)
+        {
+            RTTimerStop(pPromiscStream->pIp6Timer);
+            RTTimerDestroy(pPromiscStream->pIp6Timer);
+            ASMAtomicUoWriteNullPtr(&pPromiscStream->pIp6Timer);
+        }
+#endif
+
+        mutex_exit(&pStream->pThis->u.s.hMtx);
+    }
+
+    /*
+     * Unlink it from the list of streams.
+     */
+    for (ppPrevStream = &g_VBoxNetFltSolarisStreams; (pStream = *ppPrevStream) != NULL; ppPrevStream = &pStream->pNext)
+        if (pStream == (vboxnetflt_stream_t *)pQueue->q_ptr)
+            break;
+    *ppPrevStream = pStream->pNext;
+
+    /*
+     * Delete the stream.
+     */
+    switch (pStream->Type)
+    {
+        case kIp4Stream:        ASMAtomicUoWriteNullPtr(&pStream->pThis->u.s.pIp4Stream);     break;
+        case kIp6Stream:        ASMAtomicUoWriteNullPtr(&pStream->pThis->u.s.pIp6Stream);     break;
+        case kArpStream:        ASMAtomicUoWriteNullPtr(&pStream->pThis->u.s.pArpStream);     break;
+        case kPromiscStream:    ASMAtomicUoWriteNullPtr(&pStream->pThis->u.s.pPromiscStream); break;
+        default:    /* Heh. */
+        {
+            AssertRelease(pStream->Type);
+            break;
+        }
+    }
+
+    /*
+     * Decrement IntNet reference count for this stream.
+     */
+    vboxNetFltRelease(pStream->pThis, false /* fBusy */);
+
+    RTMemFree(pStream);
+    pQueue->q_ptr = NULL;
+    WR(pQueue)->q_ptr = NULL;
+
+    NOREF(fOpenMode);
+    NOREF(pCred);
+
+    return 0;
+}
+
+
+/**
+ * Read side put procedure for processing messages in the read queue.
+ * All streams, bound and unbound share this read procedure.
+ *
+ * @param   pQueue      Pointer to the read queue.
+ * @param   pMsg        Pointer to the message.
+ *
+ * @returns corresponding solaris error code.
+ */
+static int VBoxNetFltSolarisModReadPut(queue_t *pQueue, mblk_t *pMsg)
+{
+    if (!pMsg)
+        return 0;
+
+    LogFunc((DEVICE_NAME ":VBoxNetFltSolarisModReadPut pQueue=%p pMsg=%p\n", pQueue, pMsg));
+
+    bool fSendUpstream = true;
+    vboxnetflt_stream_t *pStream = pQueue->q_ptr;
+    PVBOXNETFLTINS pThis = NULL;
+
+    /*
+     * In the unlikely case where VirtualBox crashed and this filter
+     * is somehow still in the host stream we must try not to panic the host.
+     */
+    if (   pStream
+        && pStream->Type == kPromiscStream)
+    {
+        fSendUpstream = false;
+        pThis = ASMAtomicUoReadPtrT(&pStream->pThis, PVBOXNETFLTINS);
+        if (RT_LIKELY(pThis))
+        {
+            /*
+             * Retain the instance if we're filtering regardless of we are active or not
+             * The reason being even when we are inactive we reference the instance (e.g
+             * the promiscuous OFF acknowledgement case).
+             */
+            RTSpinlockAcquire(pThis->hSpinlock);
+            const bool fActive = pThis->enmTrunkState == INTNETTRUNKIFSTATE_ACTIVE;
+            vboxNetFltRetain(pThis, true /* fBusy */);
+            RTSpinlockRelease(pThis->hSpinlock);
+
+            vboxnetflt_promisc_stream_t *pPromiscStream = (vboxnetflt_promisc_stream_t *)pStream;
+
+            switch (DB_TYPE(pMsg))
+            {
+                case M_DATA:
+                {
+                    Log((DEVICE_NAME ":VBoxNetFltSolarisModReadPut M_DATA\n"));
+
+                    if (   fActive
+                        && pPromiscStream->fRawMode)
+                    {
+                        vboxNetFltSolarisRecv(pThis, pStream, pQueue, pMsg);
+                    }
+                    break;
+                }
+
+                case M_PROTO:
+                case M_PCPROTO:
+                {
+                    union DL_primitives *pPrim = (union DL_primitives *)pMsg->b_rptr;
+                    t_uscalar_t Prim = pPrim->dl_primitive;
+
+                    Log((DEVICE_NAME ":VBoxNetFltSolarisModReadPut: M_PCPROTO %d\n", Prim));
+                    switch (Prim)
+                    {
+                        case DL_NOTIFY_IND:
+                        {
+                            if (MBLKL(pMsg) < DL_NOTIFY_IND_SIZE)
+                            {
+                                LogRel((DEVICE_NAME ":VBoxNetFltSolarisModReadPut: Invalid notification size; expected>=%d"
+                                        " got=%d\n", DL_NOTIFY_IND_SIZE, MBLKL(pMsg)));
+                                break;
+                            }
+
+                            dl_notify_ind_t *pNotifyInd = (dl_notify_ind_t *)pMsg->b_rptr;
+                            switch (pNotifyInd->dl_notification)
+                            {
+                                case DL_NOTE_PHYS_ADDR:
+                                {
+                                    if (pNotifyInd->dl_data != DL_CURR_PHYS_ADDR)
+                                        break;
+
+                                    size_t cOffset = pNotifyInd->dl_addr_offset;
+                                    size_t cbAddr = pNotifyInd->dl_addr_length;
+
+                                    if (!cOffset || !cbAddr)
+                                    {
+                                        LogRel((DEVICE_NAME ":VBoxNetFltSolarisModReadPut: DL_NOTE_PHYS_ADDR."
+                                                "Invalid offset/addr.\n"));
+                                        fSendUpstream = false;
+                                        break;
+                                    }
+
+                                    bcopy(pMsg->b_rptr + cOffset, &pThis->u.s.MacAddr, sizeof(pThis->u.s.MacAddr));
+                                    Log((DEVICE_NAME ":VBoxNetFltSolarisModReadPut: DL_NOTE_PHYS_ADDR. New Mac=%.*Rhxs\n",
+                                             sizeof(pThis->u.s.MacAddr), &pThis->u.s.MacAddr));
+                                    break;
+                                }
+
+                                case DL_NOTE_LINK_UP:
+                                {
+                                    if (ASMAtomicXchgBool(&pThis->fDisconnectedFromHost, false))
+                                        Log((DEVICE_NAME ":VBoxNetFltSolarisModReadPut: DL_NOTE_LINK_UP.\n"));
+                                    break;
+                                }
+
+                                case DL_NOTE_LINK_DOWN:
+                                {
+                                    if (!ASMAtomicXchgBool(&pThis->fDisconnectedFromHost, true))
+                                        Log((DEVICE_NAME ":VBoxNetFltSolarisModReadPut: DL_NOTE_LINK_DOWN.\n"));
+                                    break;
+                                }
+                            }
+                            break;
+                        }
+
+                        case DL_BIND_ACK:
+                        {
+                            /*
+                             * Swallow our bind request acknowledgement.
+                             */
+                            Log((DEVICE_NAME ":VBoxNetFltSolarisModReadPut: DL_BIND_ACK. Bound to requested SAP!\n"));
+                            break;
+                        }
+
+                        case DL_PHYS_ADDR_ACK:
+                        {
+                            /*
+                             * Swallow our physical address request acknowledgement.
+                             */
+                            vboxNetFltSolarisCachePhysAddr(pThis, pMsg);
+                            break;
+                        }
+
+                        case DL_OK_ACK:
+                        {
+                            /*
+                             * Swallow our fake promiscuous request acknowledgement.
+                             */
+                            dl_ok_ack_t *pOkAck = (dl_ok_ack_t *)pMsg->b_rptr;
+                            if (pOkAck->dl_correct_primitive == DL_PROMISCON_REQ)
+                            {
+                                Log((DEVICE_NAME ":VBoxNetFltSolarisModReadPut: M_PCPROTO: DL_OK_ACK: fPromisc is ON.\n"));
+                                pPromiscStream->fPromisc = true;
+                            }
+                            else if (pOkAck->dl_correct_primitive == DL_PROMISCOFF_REQ)
+                            {
+                                Log((DEVICE_NAME ":VBoxNetFltSolarisModReadPut: M_PCPROTO: DL_OK_ACK: fPromisc is OFF.\n"));
+                                pPromiscStream->fPromisc = false;
+                            }
+                            break;
+                        }
+                    }
+                    break;
+                }
+
+                case M_IOCACK:
+                {
+                    /*
+                     * Swallow our fake raw/fast path mode request acknowledgement.
+                     */
+                    struct iocblk *pIOC = (struct iocblk *)pMsg->b_rptr;
+                    if (pIOC->ioc_id == pPromiscStream->ModeReqId)
+                    {
+                        pPromiscStream->fRawMode = true;
+                        Log((DEVICE_NAME ":VBoxNetFltSolarisModReadPut: Mode acknowledgement. RawMode is %s\n",
+                                pPromiscStream->fRawMode ? "ON" : "OFF"));
+                    }
+                    break;
+                }
+
+                case M_IOCNAK:
+                {
+                    /*
+                     * Swallow our fake raw/fast path mode request not acknowledged.
+                     */
+                    struct iocblk *pIOC = (struct iocblk *)pMsg->b_rptr;
+                    if (pIOC->ioc_id == pPromiscStream->ModeReqId)
+                    {
+                        pPromiscStream->fRawMode = false;
+                        LogRel((DEVICE_NAME ":VBoxNetFltSolarisModReadPut: WARNING! Mode not acknowledged. RawMode is %s\n",
+                                pPromiscStream->fRawMode ? "ON" : "OFF"));
+                    }
+                    break;
+                }
+
+                case M_FLUSH:
+                {
+                    /*
+                     * We must support flushing queues.
+                     */
+                    Log((DEVICE_NAME ":VBoxNetFltSolarisModReadPut: M_FLUSH\n"));
+                    if (*pMsg->b_rptr & FLUSHR)
+                        flushq(pQueue, FLUSHALL);
+                    break;
+                }
+            }
+
+            vboxNetFltRelease(pThis, true /* fBusy */);
+        }
+        else
+            LogRel((DEVICE_NAME ":VBoxNetFltSolarisModReadPut: Could not find VirtualBox instance!!\n"));
+    }
+
+    if (fSendUpstream)
+    {
+        /*
+         * Don't queue up things here, can cause bad things to happen when the system
+         * is under heavy loads and we need to jam across high priority messages which
+         * if it's not done properly will end up in an infinite loop.
+         */
+        putnext(pQueue, pMsg);
+    }
+    else
+    {
+        /*
+         * We need to free up the message if we don't pass it through.
+         */
+        freemsg(pMsg);
+    }
+
+    return 0;
+}
+
+
+/**
+ * Write side put procedure for processing messages in the write queue.
+ * All streams, bound and unbound share this write procedure.
+ *
+ * @param   pQueue      Pointer to the write queue.
+ * @param   pMsg        Pointer to the message.
+ *
+ * @returns corresponding solaris error code.
+ */
+static int VBoxNetFltSolarisModWritePut(queue_t *pQueue, mblk_t *pMsg)
+{
+    LogFunc((DEVICE_NAME ":VBoxNetFltSolarisModWritePut pQueue=%p pMsg=%p\n", pQueue, pMsg));
+
+    putnext(pQueue, pMsg);
+    return 0;
+}
+
+
+/**
+ * Put the stream in raw mode.
+ *
+ * @returns VBox status code.
+ * @param   pPromiscStream  Pointer to the read queue.
+ */
+static int vboxNetFltSolarisSetRawMode(vboxnetflt_promisc_stream_t *pPromiscStream)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisSetRawMode pPromiscStream=%p\n", pPromiscStream));
+
+    mblk_t *pRawMsg = NULL;
+    pRawMsg = mkiocb(DLIOCRAW);
+    if (RT_UNLIKELY(!pRawMsg))
+        return VERR_NO_MEMORY;
+
+    queue_t *pQueue = pPromiscStream->Stream.pReadQueue;
+    if (!pQueue)
+        return VERR_INVALID_POINTER;
+
+    struct iocblk *pIOC = (struct iocblk *)pRawMsg->b_rptr;
+    pPromiscStream->ModeReqId = pIOC->ioc_id;
+    pIOC->ioc_count = 0;
+
+    qreply(pQueue, pRawMsg);
+    return VINF_SUCCESS;
+}
+
+
+#if 0
+/**
+ * Put the stream back in fast path mode.
+ *
+ * @returns VBox status code.
+ * @param   pQueue      Pointer to the read queue.
+ */
+static int vboxNetFltSolarisSetFastMode(queue_t *pQueue)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisSetFastMode pQueue=%p\n", pQueue));
+
+    mblk_t *pFastMsg = mkiocb(DL_IOC_HDR_INFO);
+    if (RT_UNLIKELY(!pFastMsg))
+        return VERR_NO_MEMORY;
+
+    vboxnetflt_stream_t *pStream = pQueue->q_ptr;
+    struct iocblk *pIOC = (struct iocblk *)pFastMsg->b_rptr;
+    pStream->ModeReqId = pIOC->ioc_id;
+
+    size_t cbReq = sizeof(dl_unitdata_req_t) + sizeof(vboxnetflt_dladdr_t);
+    mblk_t *pDataReqMsg = allocb(cbReq, BPRI_MED);
+    if (RT_UNLIKELY(!pDataReqMsg))
+        return VERR_NO_MEMORY;
+
+    DB_TYPE(pDataReqMsg) = M_PROTO;
+    dl_unitdata_req_t *pDataReq = (dl_unitdata_req_t *)pDataReqMsg->b_rptr;
+    pDataReq->dl_primitive = DL_UNITDATA_REQ;
+    pDataReq->dl_dest_addr_length = sizeof(vboxnetflt_dladdr_t);
+    pDataReq->dl_dest_addr_offset = sizeof(dl_unitdata_req_t);
+    pDataReq->dl_priority.dl_min = 0;
+    pDataReq->dl_priority.dl_max = 0;
+
+    bzero(pDataReqMsg->b_rptr + sizeof(dl_unitdata_req_t), sizeof(vboxnetflt_dladdr_t));
+    pDataReqMsg->b_wptr = pDataReqMsg->b_rptr + cbReq;
+
+    /*
+     * Link the data format request message into the header ioctl message.
+     */
+    pFastMsg->b_cont = pDataReqMsg;
+    pIOC->ioc_count = msgdsize(pDataReqMsg);
+
+    qreply(pQueue, pFastMsg);
+    return VINF_SUCCESS;
+}
+#endif
+
+
+/**
+ * Callback function for qwriter to send promiscuous request messages
+ * downstream.
+ *
+ * @param   pQueue          Pointer to the write queue.
+ * @param   fPromisc        Whether to send promiscuous ON or OFF requests.
+ *
+ * @returns VBox status code.
+ */
+static int vboxNetFltSolarisPromiscReq(queue_t *pQueue, bool fPromisc)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisPromiscReq pQueue=%p fPromisc=%d\n", pQueue, fPromisc));
+
+    t_uscalar_t Cmd;
+    size_t cbReq = 0;
+    if (fPromisc)
+    {
+        Cmd = DL_PROMISCON_REQ;
+        cbReq = DL_PROMISCON_REQ_SIZE;
+    }
+    else
+    {
+        Cmd = DL_PROMISCOFF_REQ;
+        cbReq = DL_PROMISCOFF_REQ_SIZE;
+    }
+
+    mblk_t *pPromiscPhysMsg = mexchange(NULL, NULL, cbReq, M_PROTO, Cmd);
+    if (RT_UNLIKELY(!pPromiscPhysMsg))
+        return VERR_NO_MEMORY;
+
+    mblk_t *pPromiscSapMsg = mexchange(NULL, NULL, cbReq, M_PROTO, Cmd);
+    if (RT_UNLIKELY(!pPromiscSapMsg))
+    {
+        freemsg(pPromiscPhysMsg);
+        return VERR_NO_MEMORY;
+    }
+
+    if (fPromisc)
+    {
+        ((dl_promiscon_req_t *)pPromiscPhysMsg->b_rptr)->dl_level = DL_PROMISC_PHYS;
+        ((dl_promiscon_req_t *)pPromiscSapMsg->b_rptr)->dl_level = DL_PROMISC_SAP;
+    }
+    else
+    {
+        ((dl_promiscoff_req_t *)pPromiscPhysMsg->b_rptr)->dl_level = DL_PROMISC_PHYS;
+        ((dl_promiscoff_req_t *)pPromiscSapMsg->b_rptr)->dl_level = DL_PROMISC_SAP;
+    }
+
+    putnext(pQueue, pPromiscPhysMsg);
+    putnext(pQueue, pPromiscSapMsg);
+
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Callback wrapper for qwriter() to safely send promiscuous requests. This is
+ * called at the outer perimeter with exclusive lock held.
+ *
+ * @param pQueue            Pointer to the write queue.
+ * @param pMsg              A one byte message indicates a Promisc ON, otherwise
+ *                          a promiscuous OFF request. See
+ *                          vboxNetFltSolarisPromiscReqWrap().
+ */
+static void vboxNetFltSolarisPromiscReqWrapExcl(queue_t *pQueue, mblk_t *pMsg)
+{
+    /*
+     * Paranoia.
+     */
+    AssertReturnVoid(pQueue);
+    if (RT_UNLIKELY(!pMsg))
+        LogRel((DEVICE_NAME ":VBoxNetFltSolarisPromiscReqWrapExcl pQueue=%p missing message!\n", pQueue));
+
+    bool fPromisc = (MBLKL(pMsg) == 1);
+    freemsg(pMsg);
+    pMsg = NULL;
+    int rc = vboxNetFltSolarisPromiscReq(pQueue, fPromisc);
+    if (RT_FAILURE(rc))
+        LogRel((DEVICE_NAME ":VBoxNetFltSolarisPromiscReqWrapExcl vboxNetFltSolarisPromiscReq failed. rc=%d\n", rc));
+}
+
+
+/**
+ * Callback wrapper for qtimeout() to safely send promiscuous requests. This is
+ * called at the inner perimeter with shared lock.
+ *
+ * @param pvData            Pointer to vboxnetflt_promisc_params_t. See
+ *                          vboxNetFltPortOsSetActive().
+ */
+static void vboxNetFltSolarisPromiscReqWrap(void *pvData)
+{
+    vboxnetflt_promisc_params_t *pParams = pvData;
+    if (RT_LIKELY(pParams))
+    {
+        PVBOXNETFLTINS pThis = pParams->pThis;
+        vboxnetflt_promisc_stream_t *pPromiscStream = ASMAtomicUoReadPtrT(&pThis->u.s.pPromiscStream,
+                                                                          vboxnetflt_promisc_stream_t *);
+        if (   pPromiscStream
+            && pPromiscStream->Stream.pReadQueue)
+        {
+            /*
+             * Use size of message to indicate to qwriter callback whether it must send
+             * promiscuous On or Off messages. This is ugly but easier and more efficient than
+             * scheduling two separate qwriter callbacks with prepared messages to putnext.
+             */
+            size_t cbMsg = pParams->fPromiscOn ? 1 : 2;
+            mblk_t *pMsg = allocb(cbMsg, BPRI_HI);
+            if (RT_UNLIKELY(!pMsg))
+            {
+                LogRel((DEVICE_NAME ":Failed to alloc message of %u bytes\n", cbMsg));
+                return;
+            }
+
+            /*
+             * Move the data pointer so we can use MBLKL, as MBLKSIZE gets the db_lim which is
+             * always aligned.
+             */
+            pMsg->b_wptr += cbMsg;
+
+            /*
+             * Upgrade inner perimeter lock to exclusive outer perimeter lock and
+             * then call putnext while we are at the outer perimeter.
+             */
+            qwriter(WR(pPromiscStream->Stream.pReadQueue), pMsg, vboxNetFltSolarisPromiscReqWrapExcl, PERIM_OUTER);
+            ASMAtomicWritePtr(&pPromiscStream->TimeoutId, NULL);
+        }
+        RTMemFree(pParams);
+    }
+}
+
+
+/**
+ * Send a fake physical address request downstream.
+ *
+ * @returns VBox status code.
+ * @param   pQueue      Pointer to the read queue.
+ */
+static int vboxNetFltSolarisPhysAddrReq(queue_t *pQueue)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisPhysAddrReq pQueue=%p\n", pQueue));
+
+    t_uscalar_t Cmd = DL_PHYS_ADDR_REQ;
+    size_t cbReq = DL_PHYS_ADDR_REQ_SIZE;
+    mblk_t *pPhysAddrMsg = mexchange(NULL, NULL, cbReq, M_PROTO, Cmd);
+    if (RT_UNLIKELY(!pPhysAddrMsg))
+        return VERR_NO_MEMORY;
+
+    dl_phys_addr_req_t *pPhysAddrReq = (dl_phys_addr_req_t *)pPhysAddrMsg->b_rptr;
+    pPhysAddrReq->dl_addr_type = DL_CURR_PHYS_ADDR;
+
+    qreply(pQueue, pPhysAddrMsg);
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Cache the MAC address into the VirtualBox instance given a physical
+ * address acknowledgement message.
+ *
+ * @param   pThis       The instance.
+ * @param   pMsg        Pointer to the physical address acknowledgement message.
+ */
+static void vboxNetFltSolarisCachePhysAddr(PVBOXNETFLTINS pThis, mblk_t *pMsg)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisCachePhysAddr pThis=%p pMsg=%p\n", pThis, pMsg));
+
+    AssertCompile(sizeof(RTMAC) == ETHERADDRL);
+    dl_phys_addr_ack_t *pPhysAddrAck = (dl_phys_addr_ack_t *)pMsg->b_rptr;
+    if (pPhysAddrAck->dl_addr_length == sizeof(pThis->u.s.MacAddr))
+    {
+        bcopy(pMsg->b_rptr + pPhysAddrAck->dl_addr_offset, &pThis->u.s.MacAddr, sizeof(pThis->u.s.MacAddr));
+
+        Log((DEVICE_NAME ":vboxNetFltSolarisCachePhysAddr: DL_PHYS_ADDR_ACK: Mac=%.*Rhxs\n",
+                 sizeof(pThis->u.s.MacAddr), &pThis->u.s.MacAddr));
+
+        if (vboxNetFltTryRetainBusyNotDisconnected(pThis))
+        {
+            Assert(pThis->pSwitchPort);
+            if (pThis->pSwitchPort)
+                pThis->pSwitchPort->pfnReportMacAddress(pThis->pSwitchPort, &pThis->u.s.MacAddr);
+            vboxNetFltRelease(pThis, true /*fBusy*/);
+        }
+    }
+    else
+    {
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisCachePhysAddr: Invalid address size. expected=%d got=%d\n", ETHERADDRL,
+                pPhysAddrAck->dl_addr_length));
+    }
+}
+
+
+/**
+ * Prepare DLPI bind request to a SAP.
+ *
+ * @returns VBox status code.
+ * @param   pQueue      Pointer to the read queue.
+ * @param   SAP         The SAP to bind the stream to.
+ */
+static int vboxNetFltSolarisBindReq(queue_t *pQueue, int SAP)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisBindReq SAP=%d\n", SAP));
+
+    mblk_t *pBindMsg = mexchange(NULL, NULL, DL_BIND_REQ_SIZE, M_PROTO, DL_BIND_REQ);
+    if (RT_UNLIKELY(!pBindMsg))
+        return VERR_NO_MEMORY;
+
+    dl_bind_req_t *pBindReq = (dl_bind_req_t *)pBindMsg->b_rptr;
+    pBindReq->dl_sap = SAP;
+    pBindReq->dl_max_conind = 0;
+    pBindReq->dl_conn_mgmt = 0;
+    pBindReq->dl_xidtest_flg = 0;
+    pBindReq->dl_service_mode = DL_CLDLS;
+
+    qreply(pQueue, pBindMsg);
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Prepare DLPI notifications request.
+ *
+ * @returns VBox status code.
+ * @param   pQueue          Pointer to the read queue.
+ */
+static int vboxNetFltSolarisNotifyReq(queue_t *pQueue)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisNotifyReq\n"));
+
+    mblk_t *pNotifyMsg = mexchange(NULL, NULL, DL_NOTIFY_REQ_SIZE, M_PROTO, DL_NOTIFY_REQ);
+    if (RT_UNLIKELY(!pNotifyMsg))
+        return VERR_NO_MEMORY;
+
+    dl_notify_req_t *pNotifyReq = (dl_notify_req_t *)pNotifyMsg->b_rptr;
+    pNotifyReq->dl_notifications = DL_NOTE_LINK_UP | DL_NOTE_LINK_DOWN | DL_NOTE_PHYS_ADDR;
+
+    qreply(pQueue, pNotifyMsg);
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Opens the required device and returns the vnode_t associated with it.
+ * We require this for the funny attach/detach routine.
+ *
+ * @returns VBox status code.
+ * @param   pszDev          The device path.
+ * @param   ppVNode         Where to store the vnode_t pointer associated with the opened device.
+ * @param   ppVNodeHeld     Where to store the vnode_t required during closing of the device.
+ * @param   ppUser          Open handle required while closing the device.
+ */
+static int vboxNetFltSolarisOpenDev(char *pszDev, vnode_t **ppVNode, vnode_t **ppVNodeHeld, TIUSER **ppUser)
+{
+    int rc;
+    vnode_t *pVNodeHeld = NULL;
+    rc = lookupname(pszDev, UIO_SYSSPACE, FOLLOW, NULLVPP, &pVNodeHeld);
+    if (   !rc
+        && pVNodeHeld)
+    {
+        TIUSER *pUser;
+        rc = t_kopen((file_t *)NULL, pVNodeHeld->v_rdev, FREAD | FWRITE, &pUser, kcred);
+        if (!rc)
+        {
+            if (   pUser
+                && pUser->fp
+                && VNODE_FOR_FILE_T(pUser->fp))
+            {
+                *ppVNode = VNODE_FOR_FILE_T(pUser->fp);
+                *ppVNodeHeld = pVNodeHeld;
+                *ppUser = pUser;
+                return VINF_SUCCESS;
+            }
+            else
+            {
+                LogRel((DEVICE_NAME ":vboxNetFltSolarisOpenDev failed. pUser=%p fp=%p f_vnode=%p\n", pUser,
+                        pUser ? pUser->fp : NULL, pUser && pUser->fp ? VNODE_FOR_FILE_T(pUser->fp) : NULL));
+            }
+
+            if (pUser)
+                t_kclose(pUser, 0);
+        }
+        else
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisOpenDev t_kopen failed. rc=%d\n", rc));
+
+        VN_RELE(pVNodeHeld);
+    }
+    else
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisOpenDev lookupname failed. rc=%d pVNodeHeld=%p\n", rc, pVNodeHeld));
+
+    return VERR_PATH_NOT_FOUND;
+}
+
+
+/**
+ * Close the device opened using vboxNetFltSolarisOpenDev.
+ *
+ * @param   pVNodeHeld      Pointer to the held vnode of the device.
+ * @param   pUser           Pointer to the file handle.
+ */
+static void vboxNetFltSolarisCloseDev(vnode_t *pVNodeHeld, TIUSER *pUser)
+{
+    t_kclose(pUser, 0);
+    VN_RELE(pVNodeHeld);
+}
+
+
+/**
+ * Set the DLPI style-2 PPA via an attach request, Synchronous.
+ * Waits for request acknowledgement and verifies the result.
+ *
+ * @returns VBox status code.
+ * @param   hDevice        Layered device handle.
+ * @param   PPA            Physical Point of Attachment (PPA) number.
+ */
+static int vboxNetFltSolarisAttachReq(ldi_handle_t hDevice, int PPA)
+{
+    int rc;
+    mblk_t *pAttachMsg = mexchange(NULL, NULL, DL_ATTACH_REQ_SIZE, M_PROTO, DL_ATTACH_REQ);
+    if (RT_UNLIKELY(!pAttachMsg))
+        return VERR_NO_MEMORY;
+
+    dl_attach_req_t *pAttachReq = (dl_attach_req_t *)pAttachMsg->b_rptr;
+    pAttachReq->dl_ppa = PPA;
+
+    rc = ldi_putmsg(hDevice, pAttachMsg);
+    if (!rc)
+    {
+        rc = ldi_getmsg(hDevice, &pAttachMsg, NULL);
+        if (!rc)
+        {
+            /*
+             * Verify if the attach succeeded.
+             */
+            size_t cbMsg = MBLKL(pAttachMsg);
+            if (cbMsg >= sizeof(t_uscalar_t))
+            {
+                union DL_primitives *pPrim = (union DL_primitives *)pAttachMsg->b_rptr;
+                t_uscalar_t AckPrim = pPrim->dl_primitive;
+
+                if (   AckPrim == DL_OK_ACK                     /* Success! */
+                    && cbMsg == DL_OK_ACK_SIZE)
+                {
+                    rc = VINF_SUCCESS;
+                }
+                else if (  AckPrim == DL_ERROR_ACK              /* Error Ack. */
+                        && cbMsg == DL_ERROR_ACK_SIZE)
+                {
+                    LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachReq ldi_getmsg succeeded, but unsupported op.\n"));
+                    rc = VERR_NOT_SUPPORTED;
+                }
+                else                                            /* Garbled reply */
+                {
+                    LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachReq ldi_getmsg succeeded, but invalid op."
+                            " expected %d recvd %d\n", DL_OK_ACK, AckPrim));
+                    rc = VERR_INVALID_FUNCTION;
+                }
+            }
+            else
+            {
+                LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachReq ldi_getmsg succeeded, but invalid size %d expected %d\n", cbMsg,
+                            DL_OK_ACK_SIZE));
+                rc = VERR_INVALID_FUNCTION;
+            }
+        }
+        else
+        {
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachReq ldi_getmsg failed. rc=%d\n", rc));
+            rc = VERR_INVALID_FUNCTION;
+        }
+    }
+    else
+    {
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachReq ldi_putmsg failed. rc=%d\n", rc));
+        rc = VERR_UNRESOLVED_ERROR;
+    }
+
+    freemsg(pAttachMsg);
+    return rc;
+}
+
+
+/**
+ * Get the logical interface flags from the stream.
+ *
+ * @returns VBox status code.
+ * @param   hDevice        Layered device handle.
+ * @param   pInterface     Pointer to the interface.
+ */
+static int vboxNetFltSolarisGetIfFlags(ldi_handle_t hDevice, struct lifreq *pInterface)
+{
+    struct strioctl IOCReq;
+    int rc;
+    int ret;
+    IOCReq.ic_cmd = SIOCGLIFFLAGS;
+    IOCReq.ic_timout = 40;
+    IOCReq.ic_len = sizeof(struct lifreq);
+    IOCReq.ic_dp = (caddr_t)pInterface;
+    rc = ldi_ioctl(hDevice, I_STR, (intptr_t)&IOCReq, FKIOCTL, kcred, &ret);
+    if (!rc)
+        return VINF_SUCCESS;
+
+    return RTErrConvertFromErrno(rc);
+}
+
+
+/**
+ * Sets the multiplexor ID from the interface.
+ *
+ * @returns VBox status code.
+ * @param   pVNode      Pointer to the device vnode.
+ * @param   pInterface  Pointer to the interface.
+ */
+static int vboxNetFltSolarisSetMuxId(vnode_t *pVNode, struct lifreq *pInterface)
+{
+    struct strioctl IOCReq;
+    int rc;
+    int ret;
+    IOCReq.ic_cmd = SIOCSLIFMUXID;
+    IOCReq.ic_timout = 40;
+    IOCReq.ic_len = sizeof(struct lifreq);
+    IOCReq.ic_dp = (caddr_t)pInterface;
+
+    rc = strioctl(pVNode, I_STR, (intptr_t)&IOCReq, 0, K_TO_K, kcred, &ret);
+    if (!rc)
+        return VINF_SUCCESS;
+
+    return RTErrConvertFromErrno(rc);
+}
+
+
+/**
+ * Get the multiplexor file descriptor of the lower stream.
+ *
+ * @returns VBox status code.
+ * @param   pVNode  Pointer to the device vnode.
+ * @param   MuxId   The multiplexor ID.
+ * @param   pFd     Where to store the lower stream file descriptor.
+ */
+static int vboxNetFltSolarisMuxIdToFd(vnode_t *pVNode, int MuxId, int *pFd)
+{
+    int ret;
+    int rc = strioctl(pVNode, _I_MUXID2FD, (intptr_t)MuxId, 0, K_TO_K, kcred, &ret);
+    if (!rc)
+    {
+        *pFd = ret;
+        return VINF_SUCCESS;
+    }
+
+    return RTErrConvertFromErrno(rc);
+}
+
+
+/**
+ * Relinks the lower and the upper IPv4 stream.
+ *
+ * @returns VBox status code.
+ * @param   pVNode      Pointer to the device vnode.
+ * @param   pInterface  Pointer to the interface.
+ * @param   IpMuxFd     The IP multiplexor ID.
+ * @param   ArpMuxFd    The ARP multiplexor ID.
+ */
+static int vboxNetFltSolarisRelinkIp4(vnode_t *pVNode, struct lifreq *pInterface, int IpMuxFd, int ArpMuxFd)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisRelinkIp4: pVNode=%p pInterface=%p IpMuxFd=%d ArpMuxFd=%d\n", pVNode,
+            pInterface, IpMuxFd, ArpMuxFd));
+
+    int NewIpMuxId;
+    int NewArpMuxId;
+    int rc = strioctl(pVNode, I_PLINK, (intptr_t)IpMuxFd, 0, K_TO_K, kcred, &NewIpMuxId);
+    int rc2 = strioctl(pVNode, I_PLINK, (intptr_t)ArpMuxFd, 0, K_TO_K, kcred, &NewArpMuxId);
+    if (   !rc
+        && !rc2)
+    {
+        pInterface->lifr_ip_muxid = NewIpMuxId;
+        pInterface->lifr_arp_muxid = NewArpMuxId;
+        rc = vboxNetFltSolarisSetMuxId(pVNode, pInterface);
+        if (RT_SUCCESS(rc))
+            return VINF_SUCCESS;
+
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisRelinkIp4: failed to set new Mux Id.\n"));
+    }
+    else
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisRelinkIp4: failed to link.\n"));
+
+    return VERR_GENERAL_FAILURE;
+}
+
+
+/**
+ * Relinks the lower and the upper IPv6 stream.
+ *
+ * @returns VBox status code.
+ * @param   pVNode      Pointer to the device vnode.
+ * @param   pInterface  Pointer to the interface.
+ * @param   Ip6MuxFd    The IPv6 multiplexor ID.
+ */
+static int vboxNetFltSolarisRelinkIp6(vnode_t *pVNode, struct lifreq *pInterface, int Ip6MuxFd)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisRelinkIp6: pVNode=%p pInterface=%p Ip6MuxFd=%d\n", pVNode, pInterface, Ip6MuxFd));
+
+    int NewIp6MuxId;
+    int rc = strioctl(pVNode, I_PLINK, (intptr_t)Ip6MuxFd, 0, K_TO_K, kcred, &NewIp6MuxId);
+    if (!rc)
+    {
+        pInterface->lifr_ip_muxid = NewIp6MuxId;
+        rc = vboxNetFltSolarisSetMuxId(pVNode, pInterface);
+        if (RT_SUCCESS(rc))
+            return VINF_SUCCESS;
+
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisRelinkIp6: failed to set new Mux Id.\n"));
+    }
+    else
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisRelinkIp6: failed to link.\n"));
+
+    return VERR_GENERAL_FAILURE;
+}
+
+
+/**
+ * Dynamically find the position on the host stack where to attach/detach ourselves.
+ *
+ * @returns VBox status code.
+ * @param   fAttach     Is this an attach or detach.
+ * @param   pVNode      Pointer to the lower stream vnode.
+ * @param   pModPos     Where to store the module position.
+ */
+static int vboxNetFltSolarisDetermineModPos(bool fAttach, vnode_t *pVNode, int *pModPos)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisDetermineModPos: fAttach=%d pVNode=%p pModPos=%p\n", fAttach, pVNode, pModPos));
+
+    int cMod;
+    int rc = strioctl(pVNode, I_LIST, (intptr_t)NULL, 0, K_TO_K, kcred, &cMod);
+    if (!rc)
+    {
+        if (cMod < 1)
+        {
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisDetermineModPos: too few modules on host interface. cMod=%d\n"));
+            return VERR_OUT_OF_RANGE;
+        }
+
+        /*
+         * While attaching we make sure we are at the bottom most of the stack, excepting
+         * the host driver.
+         */
+        Log((DEVICE_NAME ":vboxNetFltSolarisDetermineModPos: cMod=%d\n", cMod));
+        if (fAttach)
+        {
+            *pModPos = cMod - 1;
+            return VINF_SUCCESS;
+        }
+
+        /*
+         * Detaching is a bit more complicated; since user could have altered the stack positions
+         * we take the safe approach by finding our position.
+         */
+        struct str_list StrList;
+        StrList.sl_nmods = cMod;
+        StrList.sl_modlist = RTMemAllocZ(cMod * sizeof(struct str_list));
+        if (RT_UNLIKELY(!StrList.sl_modlist))
+        {
+            Log((DEVICE_NAME ":vboxNetFltSolarisDetermineModPos: failed to alloc memory for StrList.\n"));
+            return VERR_NO_MEMORY;
+        }
+
+        /*
+         * Get the list of all modules on the stack.
+         */
+        int ret;
+        rc = strioctl(pVNode, I_LIST, (intptr_t)&StrList, 0, K_TO_K, kcred, &ret);
+        if (!rc)
+        {
+            /*
+             * Find our filter.
+             */
+            for (int i = 0; i < StrList.sl_nmods; i++)
+            {
+                if (!strcmp(DEVICE_NAME, StrList.sl_modlist[i].l_name))
+                {
+                    Log((DEVICE_NAME ":vboxNetFltSolarisDetermineModPos: Success! Found %s at %d.\n", DEVICE_NAME, i));
+                    *pModPos = i;
+                    RTMemFree(StrList.sl_modlist);
+                    return VINF_SUCCESS;
+                }
+            }
+
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisDetermineModPos: failed to find %s in the host stack.\n", DEVICE_NAME));
+        }
+        else
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisDetermineModPos: failed to get module information. rc=%d\n"));
+
+        RTMemFree(StrList.sl_modlist);
+    }
+    else
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisDetermineModPos: failed to get list of modules on host interface. rc=%d\n", rc));
+    return VERR_GENERAL_FAILURE;
+}
+
+
+/**
+ * Opens up the DLPI style 2 link that requires explicit PPA attach
+ * phase.
+ *
+ * @returns VBox status code.
+ * @param   pThis       The instance.
+ * @param   pDevId      Where to store the opened LDI device id.
+ */
+static int vboxNetFltSolarisOpenStyle2(PVBOXNETFLTINS pThis, ldi_ident_t *pDevId)
+{
+    /*
+     * Strip out PPA from the device name, eg: "ce3".
+     */
+    char *pszDev = RTStrDup(pThis->szName);
+    if (!pszDev)
+        return VERR_NO_MEMORY;
+
+    char *pszEnd = strchr(pszDev, '\0');
+    while (--pszEnd > pszDev)
+        if (!RT_C_IS_DIGIT(*pszEnd))
+            break;
+    pszEnd++;
+
+    int rc = VERR_GENERAL_FAILURE;
+    long PPA = -1;
+    if (   pszEnd
+        && ddi_strtol(pszEnd, NULL, 10, &PPA) == 0)
+    {
+        *pszEnd = '\0';
+        char szDev[128];
+        RTStrPrintf(szDev, sizeof(szDev), "/dev/%s", pszDev);
+
+        /*
+         * Try open the device as DPLI style 2.
+         */
+        rc = ldi_open_by_name(szDev, FREAD | FWRITE, kcred, &pThis->u.s.hIface, *pDevId);
+        if (!rc)
+        {
+            /*
+             * Attach the PPA explictly.
+             */
+            rc = vboxNetFltSolarisAttachReq(pThis->u.s.hIface, (int)PPA);
+            if (RT_SUCCESS(rc))
+            {
+                RTStrFree(pszDev);
+                return rc;
+            }
+
+            ldi_close(pThis->u.s.hIface, FREAD | FWRITE, kcred);
+            pThis->u.s.hIface = NULL;
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisOpenStyle2 dl_attach failed. rc=%d szDev=%s PPA=%d rc=%d\n", rc, szDev, PPA));
+        }
+        else
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisOpenStyle2 Failed to open. rc=%d szDev=%s PPA=%d\n", rc, szDev, PPA));
+    }
+    else
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisOpenStyle2 Failed to construct PPA. pszDev=%s pszEnd=%s.\n", pszDev, pszEnd));
+
+    RTStrFree(pszDev);
+    return VERR_INTNET_FLT_IF_FAILED;
+}
+
+
+/**
+ * Opens up dedicated stream on top of the interface.
+ * As a side-effect, the stream gets opened during
+ * the I_PUSH phase.
+ *
+ * @param   pThis       The instance.
+ */
+static int vboxNetFltSolarisOpenStream(PVBOXNETFLTINS pThis)
+{
+    ldi_ident_t DevId;
+    DevId = ldi_ident_from_anon();
+    int ret;
+
+    /*
+     * Figure out if this is a VLAN interface or not based on the interface name.
+     * Only works for the VLAN PPA-hack based names. See @bugref{4854} for details.
+     */
+    char *pszEnd = strchr(pThis->szName, '\0');
+    while (--pszEnd > pThis->szName)
+        if (!RT_C_IS_DIGIT(*pszEnd))
+            break;
+    pszEnd++;
+    uint32_t PPA = RTStrToUInt32(pszEnd);
+    if (PPA > 1000)
+    {
+        pThis->u.s.fVLAN = true;
+        LogRel((DEVICE_NAME ": %s detected as VLAN interface with VID=%u.\n", pThis->szName, PPA / 1000U));
+    }
+
+    /*
+     * Try style-1 open first.
+     */
+    char szDev[128];
+    RTStrPrintf(szDev, sizeof(szDev), "/dev/net/%s", pThis->szName);
+    int rc = ldi_open_by_name(szDev, FREAD | FWRITE, kcred, &pThis->u.s.hIface, DevId);
+    if (   rc
+        && rc == ENODEV)    /* ENODEV is returned when resolvepath fails, not ENOENT */
+    {
+        /*
+         * Fallback to non-ClearView style-1 open.
+         */
+        RTStrPrintf(szDev, sizeof(szDev), "/dev/%s", pThis->szName);
+        rc = ldi_open_by_name(szDev, FREAD | FWRITE, kcred, &pThis->u.s.hIface, DevId);
+    }
+
+    if (rc)
+    {
+        /*
+         * Try DLPI style 2.
+         */
+        rc = vboxNetFltSolarisOpenStyle2(pThis, &DevId);
+        if (RT_FAILURE(rc))
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisOpenStream vboxNetFltSolarisOpenStyle2 failed. rc=%d\n", rc));
+        else
+            rc = 0;
+    }
+
+    ldi_ident_release(DevId);
+    if (rc)
+    {
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisOpenStream Failed to open '%s' rc=%d pszName='%s'\n", szDev, rc, pThis->szName));
+        return VERR_INTNET_FLT_IF_FAILED;
+    }
+
+    rc = ldi_ioctl(pThis->u.s.hIface, I_FIND, (intptr_t)DEVICE_NAME, FKIOCTL, kcred, &ret);
+    if (!rc)
+    {
+        if (!ret)
+        {
+            if (RT_LIKELY(g_pVBoxNetFltSolarisCred))        /* Paranoia */
+            {
+                rc = RTSemFastMutexRequest(g_VBoxNetFltSolarisMtx);
+                AssertRCReturn(rc, rc);
+
+                g_VBoxNetFltSolarisInstance = pThis;
+                g_VBoxNetFltSolarisStreamType = kPromiscStream;
+
+                rc = ldi_ioctl(pThis->u.s.hIface, I_PUSH, (intptr_t)DEVICE_NAME, FKIOCTL, g_pVBoxNetFltSolarisCred, &ret);
+
+                g_VBoxNetFltSolarisInstance = NULL;
+                g_VBoxNetFltSolarisStreamType = kUndefined;
+
+                RTSemFastMutexRelease(g_VBoxNetFltSolarisMtx);
+            }
+            else
+            {
+                LogRel((DEVICE_NAME ":vboxNetFltSolarisOpenStream huh!? Missing credentials.\n"));
+                rc = VERR_INVALID_POINTER;
+            }
+
+            if (!rc)
+                return VINF_SUCCESS;
+
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisOpenStream Failed to push filter onto host interface '%s'\n", pThis->szName));
+        }
+        else
+            return VINF_SUCCESS;
+    }
+    else
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisOpenStream Failed to search for filter in interface '%s'.\n", pThis->szName));
+
+    ldi_close(pThis->u.s.hIface, FREAD | FWRITE, kcred);
+    pThis->u.s.hIface = NULL;
+
+    return VERR_INTNET_FLT_IF_FAILED;
+}
+
+
+/**
+ * Closes the interface, thereby closing the dedicated stream.
+ *
+ * @param   pThis       The instance.
+ */
+static void vboxNetFltSolarisCloseStream(PVBOXNETFLTINS pThis)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisCloseStream pThis=%p\n"));
+
+    if (pThis->u.s.hIface)
+    {
+        ldi_close(pThis->u.s.hIface, FREAD | FWRITE, kcred);
+        pThis->u.s.hIface = NULL;
+    }
+}
+
+
+/**
+ * Dynamically attach under IPv4 and ARP streams on the host stack.
+ *
+ * @returns VBox status code.
+ * @param   pThis       The instance.
+ * @param   fAttach     Is this an attach or detach.
+ */
+static int vboxNetFltSolarisAttachIp4(PVBOXNETFLTINS pThis, bool fAttach)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisAttachIp4 pThis=%p fAttach=%d\n", pThis, fAttach));
+
+    /*
+     * Statutory Warning: Hackish code ahead.
+     */
+    char *pszModName = DEVICE_NAME;
+
+    struct lifreq Ip4Interface;
+    bzero(&Ip4Interface, sizeof(Ip4Interface));
+    Ip4Interface.lifr_addr.ss_family = AF_INET;
+    strncpy(Ip4Interface.lifr_name, pThis->szName, sizeof(Ip4Interface.lifr_name));
+
+    struct strmodconf StrMod;
+    StrMod.mod_name = pszModName;
+    StrMod.pos = -1;        /* this is filled in later. */
+
+    struct strmodconf ArpStrMod;
+    bcopy(&StrMod, &ArpStrMod, sizeof(StrMod));
+
+    int rc;
+    int rc2;
+    int ret;
+    ldi_ident_t DeviceIdent = ldi_ident_from_anon();
+    ldi_handle_t Ip4DevHandle;
+    ldi_handle_t ArpDevHandle;
+
+    /*
+     * Open the IP and ARP streams as layered devices.
+     */
+    rc = ldi_open_by_name(IP_DEV_NAME, FREAD | FWRITE, kcred, &Ip4DevHandle, DeviceIdent);
+    if (rc)
+    {
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachIp4: failed to open the IP stream on '%s'.\n", pThis->szName));
+        ldi_ident_release(DeviceIdent);
+        return VERR_INTNET_FLT_IF_FAILED;
+    }
+
+    rc = ldi_open_by_name("/dev/arp", FREAD | FWRITE, kcred, &ArpDevHandle, DeviceIdent);
+    if (rc)
+    {
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachIp4: failed to open the ARP stream on '%s'.\n", pThis->szName));
+        ldi_ident_release(DeviceIdent);
+        ldi_close(Ip4DevHandle, FREAD | FWRITE, kcred);
+        return VERR_INTNET_FLT_IF_FAILED;
+    }
+
+    ldi_ident_release(DeviceIdent);
+
+    /*
+     * Obtain the interface flags from IPv4.
+     */
+    rc = vboxNetFltSolarisGetIfFlags(Ip4DevHandle, &Ip4Interface);
+    if (RT_SUCCESS(rc))
+    {
+        /*
+         * Open the UDP stream. We sort of cheat here and obtain the vnode so that we can perform
+         * things that are not possible from the layered interface.
+         */
+        vnode_t *pUdp4VNode = NULL;
+        vnode_t *pUdp4VNodeHeld = NULL;
+        TIUSER *pUdp4User = NULL;
+        rc = vboxNetFltSolarisOpenDev(UDP_DEV_NAME, &pUdp4VNode, &pUdp4VNodeHeld, &pUdp4User);
+        if (RT_SUCCESS(rc))
+        {
+            /*
+             * Get the multiplexor IDs.
+             */
+            rc = ldi_ioctl(Ip4DevHandle, SIOCGLIFMUXID, (intptr_t)&Ip4Interface, FKIOCTL, kcred, &ret);
+            if (!rc)
+            {
+                /*
+                 * Get the multiplex file descriptor to the lower streams. Generally this is lost
+                 * once a module is I_PLINK, we need to reobtain it for inserting/removing ourselves from the stack.
+                 */
+                int Ip4MuxFd;
+                int ArpMuxFd;
+                rc = vboxNetFltSolarisMuxIdToFd(pUdp4VNode, Ip4Interface.lifr_ip_muxid, &Ip4MuxFd);
+                rc2 = vboxNetFltSolarisMuxIdToFd(pUdp4VNode, Ip4Interface.lifr_arp_muxid, &ArpMuxFd);
+                if (   RT_SUCCESS(rc)
+                    && RT_SUCCESS(rc2))
+                {
+                    /*
+                     * We need to I_PUNLINK on these multiplexor IDs before we can start
+                     * operating on the lower stream as insertions are direct operations on the lower stream.
+                     */
+                    rc = strioctl(pUdp4VNode, I_PUNLINK, (intptr_t)Ip4Interface.lifr_ip_muxid, 0, K_TO_K, kcred, &ret);
+                    rc2 = strioctl(pUdp4VNode, I_PUNLINK, (intptr_t)Ip4Interface.lifr_arp_muxid, 0, K_TO_K, kcred, &ret);
+                    if (   !rc
+                        && !rc2)
+                    {
+                        /*
+                         * Obtain the vnode from the useless userland file descriptor.
+                         */
+                        file_t *pIpFile = getf(Ip4MuxFd);
+                        file_t *pArpFile = getf(ArpMuxFd);
+                        if (   pIpFile
+                            && pArpFile
+                            && VNODE_FOR_FILE_T(pArpFile)
+                            && VNODE_FOR_FILE_T(pIpFile))
+                        {
+                            vnode_t *pIp4VNode = VNODE_FOR_FILE_T(pIpFile);
+                            vnode_t *pArpVNode = VNODE_FOR_FILE_T(pArpFile);
+
+                            /*
+                             * Find the position on the host stack for attaching/detaching ourselves.
+                             */
+                            rc = vboxNetFltSolarisDetermineModPos(fAttach, pIp4VNode, &StrMod.pos);
+                            rc2 = vboxNetFltSolarisDetermineModPos(fAttach, pArpVNode, &ArpStrMod.pos);
+                            if (   RT_SUCCESS(rc)
+                                && RT_SUCCESS(rc2))
+                            {
+                                /*
+                                 * Inject/Eject from the host IP stack.
+                                 */
+
+                                /*
+                                 * Set global data which will be grabbed by ModOpen.
+                                 * There is a known (though very unlikely) race here because
+                                 * of the inability to pass user data while inserting.
+                                 */
+                                rc = RTSemFastMutexRequest(g_VBoxNetFltSolarisMtx);
+                                AssertRCReturn(rc, rc);
+
+                                if (fAttach)
+                                {
+                                    g_VBoxNetFltSolarisInstance = pThis;
+                                    g_VBoxNetFltSolarisStreamType = kIp4Stream;
+                                }
+
+                                rc = strioctl(pIp4VNode, fAttach ? _I_INSERT : _I_REMOVE, (intptr_t)&StrMod, 0, K_TO_K,
+                                            g_pVBoxNetFltSolarisCred, &ret);
+
+                                if (fAttach)
+                                {
+                                    g_VBoxNetFltSolarisInstance = NULL;
+                                    g_VBoxNetFltSolarisStreamType = kUndefined;
+                                }
+
+                                RTSemFastMutexRelease(g_VBoxNetFltSolarisMtx);
+
+                                if (!rc)
+                                {
+                                    /*
+                                     * Inject/Eject from the host ARP stack.
+                                     */
+                                    rc = RTSemFastMutexRequest(g_VBoxNetFltSolarisMtx);
+                                    AssertRCReturn(rc, rc);
+
+                                    if (fAttach)
+                                    {
+                                        g_VBoxNetFltSolarisInstance = pThis;
+                                        g_VBoxNetFltSolarisStreamType = kArpStream;
+                                    }
+
+                                    rc = strioctl(pArpVNode, fAttach ? _I_INSERT : _I_REMOVE, (intptr_t)&ArpStrMod, 0, K_TO_K,
+                                                g_pVBoxNetFltSolarisCred, &ret);
+
+                                    if (fAttach)
+                                    {
+                                        g_VBoxNetFltSolarisInstance = NULL;
+                                        g_VBoxNetFltSolarisStreamType = kUndefined;
+                                    }
+
+                                    RTSemFastMutexRelease(g_VBoxNetFltSolarisMtx);
+
+                                    if (!rc)
+                                    {
+                                        /*
+                                         * Our job's not yet over; we need to relink the upper and lower streams
+                                         * otherwise we've pretty much screwed up the host interface.
+                                         */
+                                        rc = vboxNetFltSolarisRelinkIp4(pUdp4VNode, &Ip4Interface, Ip4MuxFd, ArpMuxFd);
+                                        if (RT_SUCCESS(rc))
+                                        {
+                                            /*
+                                             * Close the devices ONLY during the return from function case; otherwise
+                                             * we end up close twice which is an instant kernel panic.
+                                             */
+                                            vboxNetFltSolarisCloseDev(pUdp4VNodeHeld, pUdp4User);
+                                            ldi_close(ArpDevHandle, FREAD | FWRITE, kcred);
+                                            ldi_close(Ip4DevHandle, FREAD | FWRITE, kcred);
+                                            releasef(Ip4MuxFd);
+                                            releasef(ArpMuxFd);
+
+                                            Log((DEVICE_NAME ":vboxNetFltSolarisAttachIp4: Success! %s %s@(IPv4:%d Arp:%d) "
+                                                    "%s interface %s\n", fAttach ? "Injected" : "Ejected", StrMod.mod_name,
+                                                    StrMod.pos, ArpStrMod.pos, fAttach ? "to" : "from", pThis->szName));
+                                            return VINF_SUCCESS;
+                                        }
+                                        else
+                                        {
+                                            LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachIp4: Relinking failed. Mode=%s rc=%d.\n",
+                                                    fAttach ? "inject" : "eject", rc));
+                                        }
+
+                                        /*
+                                         * Try failing gracefully during attach.
+                                         */
+                                        if (fAttach)
+                                            strioctl(pArpVNode, _I_REMOVE, (intptr_t)&StrMod, 0, K_TO_K, kcred, &ret);
+                                    }
+                                    else
+                                    {
+                                        LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachIp4: failed to %s the ARP stack. rc=%d\n",
+                                                fAttach ? "inject into" : "eject from", rc));
+                                    }
+
+                                    if (fAttach)
+                                        strioctl(pIp4VNode, _I_REMOVE, (intptr_t)&StrMod, 0, K_TO_K, kcred, &ret);
+
+                                    vboxNetFltSolarisRelinkIp4(pUdp4VNode, &Ip4Interface, Ip4MuxFd, ArpMuxFd);
+                                }
+                                else
+                                {
+                                    LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachIp4: failed to %s the IP stack. rc=%d\n",
+                                            fAttach ? "inject into" : "eject from", rc));
+                                }
+                            }
+                            else
+                            {
+                                LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachIp4: failed to find position. rc=%d rc2=%d\n", rc,
+                                        rc2));
+                            }
+
+                            releasef(Ip4MuxFd);
+                            releasef(ArpMuxFd);
+                        }
+                        else
+                            LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachIp4: failed to get vnode from MuxFd.\n"));
+                    }
+                    else
+                    {
+                        LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachIp4: failed to unlink upper stream rc=%d rc2=%d.\n", rc,
+                                rc2));
+                    }
+                }
+                else
+                    LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachIp4: failed to get MuxFd from MuxId. rc=%d rc2=%d\n", rc, rc2));
+            }
+            else
+                LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachIp4: failed to get Mux Ids. rc=%d\n", rc));
+            vboxNetFltSolarisCloseDev(pUdp4VNodeHeld, pUdp4User);
+        }
+        else
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachIp4: failed to open UDP. rc=%d\n", rc));
+
+        rc = VERR_INTNET_FLT_IF_FAILED;
+    }
+    else
+    {
+        /*
+         * This would happen for interfaces that are not plumbed.
+         */
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachIp4: Warning: seems '%s' is unplumbed.\n", pThis->szName));
+        rc = VINF_SUCCESS;
+    }
+
+    ldi_close(ArpDevHandle, FREAD | FWRITE, kcred);
+    ldi_close(Ip4DevHandle, FREAD | FWRITE, kcred);
+
+    return rc;
+}
+
+
+/**
+ * Dynamically attach under IPv6 on the host stack.
+ *
+ * @returns VBox status code.
+ * @param   pThis       The instance.
+ * @param   fAttach     Is this an attach or detach.
+ */
+static int vboxNetFltSolarisAttachIp6(PVBOXNETFLTINS pThis, bool fAttach)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisAttachIp6 pThis=%p fAttach=%d\n", pThis, fAttach));
+
+    /*
+     * Statutory Warning: Hackish code ahead.
+     */
+    char *pszModName = DEVICE_NAME;
+
+    struct lifreq Ip6Interface;
+    bzero(&Ip6Interface, sizeof(Ip6Interface));
+    Ip6Interface.lifr_addr.ss_family = AF_INET6;
+    strncpy(Ip6Interface.lifr_name, pThis->szName, sizeof(Ip6Interface.lifr_name));
+
+    struct strmodconf StrMod;
+    StrMod.mod_name = pszModName;
+    StrMod.pos = -1;        /* this is filled in later. */
+
+    int rc;
+    int ret;
+    ldi_ident_t DeviceIdent = ldi_ident_from_anon();
+    ldi_handle_t Ip6DevHandle;
+
+    /*
+     * Open the IPv6 stream as a layered devices.
+     */
+    rc = ldi_open_by_name(IP6_DEV_NAME, FREAD | FWRITE, kcred, &Ip6DevHandle, DeviceIdent);
+    ldi_ident_release(DeviceIdent);
+    if (rc)
+    {
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachIp6: failed to open the IPv6 stream on '%s'.\n", pThis->szName));
+        return VERR_INTNET_FLT_IF_FAILED;
+    }
+
+    /*
+     * Obtain the interface flags from IPv6.
+     */
+    rc = vboxNetFltSolarisGetIfFlags(Ip6DevHandle, &Ip6Interface);
+    if (RT_SUCCESS(rc))
+    {
+        /*
+         * Open the UDP stream. We sort of cheat here and obtain the vnode so that we can perform
+         * things that are not possible from the layered interface.
+         */
+        vnode_t *pUdp6VNode = NULL;
+        vnode_t *pUdp6VNodeHeld = NULL;
+        TIUSER *pUdp6User = NULL;
+        rc = vboxNetFltSolarisOpenDev(UDP6_DEV_NAME, &pUdp6VNode, &pUdp6VNodeHeld, &pUdp6User);
+        if (RT_SUCCESS(rc))
+        {
+            /*
+             * Get the multiplexor IDs.
+             */
+            rc = ldi_ioctl(Ip6DevHandle, SIOCGLIFMUXID, (intptr_t)&Ip6Interface, FKIOCTL, kcred, &ret);
+            if (!rc)
+            {
+                /*
+                 * Get the multiplex file descriptor to the lower streams. Generally this is lost
+                 * once a module is I_PLINK, we need to reobtain it for inserting/removing ourselves from the stack.
+                 */
+                int Ip6MuxFd;
+                rc = vboxNetFltSolarisMuxIdToFd(pUdp6VNode, Ip6Interface.lifr_ip_muxid, &Ip6MuxFd);
+                if (RT_SUCCESS(rc))
+                {
+                    /*
+                     * We need to I_PUNLINK on these multiplexor IDs before we can start
+                     * operating on the lower stream as insertions are direct operations on the lower stream.
+                     */
+                    rc = strioctl(pUdp6VNode, I_PUNLINK, (intptr_t)Ip6Interface.lifr_ip_muxid, 0, K_TO_K, kcred, &ret);
+                    if (!rc)
+                    {
+                        /*
+                         * Obtain the vnode from the useless userland file descriptor.
+                         */
+                        file_t *pIpFile = getf(Ip6MuxFd);
+                        if (   pIpFile
+                            && VNODE_FOR_FILE_T(pIpFile))
+                        {
+                            vnode_t *pIp6VNode = VNODE_FOR_FILE_T(pIpFile);
+
+                            /*
+                             * Find the position on the host stack for attaching/detaching ourselves.
+                             */
+                            rc = vboxNetFltSolarisDetermineModPos(fAttach, pIp6VNode, &StrMod.pos);
+                            if (RT_SUCCESS(rc))
+                            {
+                                /*
+                                 * Set global data which will be grabbed by ModOpen.
+                                 * There is a known (though very unlikely) race here because
+                                 * of the inability to pass user data while inserting.
+                                 */
+                                rc = RTSemFastMutexRequest(g_VBoxNetFltSolarisMtx);
+                                AssertRCReturn(rc, rc);
+
+                                if (fAttach)
+                                {
+                                    g_VBoxNetFltSolarisInstance = pThis;
+                                    g_VBoxNetFltSolarisStreamType = kIp6Stream;
+                                }
+
+                                /*
+                                 * Inject/Eject from the host IPv6 stack.
+                                 */
+                                rc = strioctl(pIp6VNode, fAttach ? _I_INSERT : _I_REMOVE, (intptr_t)&StrMod, 0, K_TO_K,
+                                            g_pVBoxNetFltSolarisCred, &ret);
+
+                                if (fAttach)
+                                {
+                                    g_VBoxNetFltSolarisInstance = NULL;
+                                    g_VBoxNetFltSolarisStreamType = kUndefined;
+                                }
+
+                                RTSemFastMutexRelease(g_VBoxNetFltSolarisMtx);
+
+                                if (!rc)
+                                {
+                                    /*
+                                     * Our job's not yet over; we need to relink the upper and lower streams
+                                     * otherwise we've pretty much screwed up the host interface.
+                                     */
+                                    rc = vboxNetFltSolarisRelinkIp6(pUdp6VNode, &Ip6Interface, Ip6MuxFd);
+                                    if (RT_SUCCESS(rc))
+                                    {
+                                        /*
+                                         * Close the devices ONLY during the return from function case; otherwise
+                                         * we end up close twice which is an instant kernel panic.
+                                         */
+                                        vboxNetFltSolarisCloseDev(pUdp6VNodeHeld, pUdp6User);
+                                        ldi_close(Ip6DevHandle, FREAD | FWRITE, kcred);
+                                        releasef(Ip6MuxFd);
+
+                                        Log((DEVICE_NAME ":vboxNetFltSolarisAttachIp6: Success! %s %s@(IPv6:%d) "
+                                                "%s interface %s\n", fAttach ? "Injected" : "Ejected", StrMod.mod_name,
+                                                StrMod.pos, fAttach ? "to" : "from", pThis->szName));
+                                        return VINF_SUCCESS;
+                                    }
+                                    else
+                                    {
+                                        LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachIp6: Relinking failed. Mode=%s rc=%d.\n",
+                                                fAttach ? "inject" : "eject", rc));
+                                    }
+
+                                    if (fAttach)
+                                        strioctl(pIp6VNode, _I_REMOVE, (intptr_t)&StrMod, 0, K_TO_K, kcred, &ret);
+
+                                    vboxNetFltSolarisRelinkIp6(pUdp6VNode, &Ip6Interface, Ip6MuxFd);
+                                }
+                                else
+                                {
+                                    LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachIp6: failed to %s the IP stack. rc=%d\n",
+                                            fAttach ? "inject into" : "eject from", rc));
+                                }
+                            }
+                            else
+                                LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachIp6: failed to find position. rc=%d\n", rc));
+
+                            releasef(Ip6MuxFd);
+                        }
+                        else
+                             LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachIp6: failed to get vnode from MuxFd.\n"));
+                    }
+                    else
+                        LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachIp6: failed to unlink upper stream rc=%d.\n", rc));
+                }
+                else
+                    LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachIp6: failed to get MuxFd from MuxId. rc=%d\n", rc));
+            }
+            else
+                LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachIp6: failed to get Mux Ids. rc=%d\n", rc));
+
+            vboxNetFltSolarisCloseDev(pUdp6VNodeHeld, pUdp6User);
+        }
+        else
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachIp6: failed to open UDP. rc=%d\n", rc));
+
+        rc = VERR_INTNET_FLT_IF_FAILED;
+    }
+    else
+    {
+        Log((DEVICE_NAME ":vboxNetFltSolarisAttachIp6: failed to get IPv6 flags.\n", pThis->szName));
+        rc = VERR_INTNET_FLT_IF_NOT_FOUND;
+    }
+
+    ldi_close(Ip6DevHandle, FREAD | FWRITE, kcred);
+
+    return rc;
+}
+
+
+#ifdef VBOXNETFLT_SOLARIS_IPV6_POLLING
+/**
+ * Ipv6 dynamic attachment timer callback to attach to the Ipv6 stream if needed.
+ *
+ * @param   pTimer          Pointer to the timer.
+ * @param   pvData          Opaque pointer to the instance.
+ * @param   iTick           Timer tick (unused).
+ */
+static void vboxNetFltSolarispIp6Timer(PRTTIMER pTimer, void *pvData, uint64_t iTick)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarispIp6Timer pTimer=%p pvData=%p\n", pTimer, pvData));
+
+    PVBOXNETFLTINS pThis = (PVBOXNETFLTINS)pvData;
+    if (   RT_LIKELY(pThis)
+        && RT_LIKELY(pTimer))
+    {
+        vboxnetflt_stream_t *pIp6Stream = ASMAtomicUoReadPtrT(&pThis->u.s.pIp6Stream, vboxnetflt_stream_t *);
+        bool fIp6Attaching = ASMAtomicUoReadBool(&pThis->u.s.fAttaching);
+        if (   !pIp6Stream
+            && !fIp6Attaching)
+        {
+            int rc = RTSemFastMutexRequest(pThis->u.s.hPollMtx);
+            if (RT_SUCCESS(rc))
+            {
+                ASMAtomicUoWriteBool(&pThis->u.s.fAttaching, true);
+
+                vboxNetFltSolarisAttachIp6(pThis, true /* fAttach */);
+
+                ASMAtomicUoWriteBool(&pThis->u.s.fAttaching, false);
+                RTSemFastMutexRelease(pThis->u.s.hPollMtx);
+            }
+            else
+                LogRel((DEVICE_NAME ":vboxNetFltSolarispIp6Timer failed to obtain mutex. rc=%Rrc\n", rc));
+        }
+    }
+
+    NOREF(iTick);
+}
+
+
+/**
+ * Setups up a kernel timer based on the driver property for attaching to IPv6 stream
+ * whenever the stream gets plumbed for the interface.
+ *
+ * @returns VBox status code.
+ * @param   pThis           The instance.
+ */
+static int vboxNetFltSolarisSetupIp6Polling(PVBOXNETFLTINS pThis)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisSetupIp6Polling pThis=%p\n", pThis));
+
+    int rc = VERR_GENERAL_FAILURE;
+    vboxnetflt_promisc_stream_t *pPromiscStream = ASMAtomicUoReadPtrT(&pThis->u.s.pPromiscStream, vboxnetflt_promisc_stream_t *);
+    if (RT_LIKELY(pPromiscStream))
+    {
+        if (RT_LIKELY(pPromiscStream->pIp6Timer == NULL))
+        {
+            /*
+             * Validate IPv6 polling interval.
+             */
+            int Interval = g_VBoxNetFltSolarisPollInterval;
+            if (Interval < 1 || Interval > 120)
+            {
+                LogRel((DEVICE_NAME ":vboxNetFltSolarisSetupIp6Polling: Invalid polling interval %d. Expected between"
+                        " 1 and 120 secs.\n", Interval));
+                return VERR_INVALID_PARAMETER;
+            }
+
+            /*
+             * Setup kernel poll timer.
+             */
+            rc = RTTimerCreateEx(&pPromiscStream->pIp6Timer, Interval * (uint64_t)1000000000, RTTIMER_FLAGS_CPU_ANY,
+                                vboxNetFltSolarispIp6Timer, (void *)pThis);
+            if (RT_SUCCESS(rc))
+            {
+                rc = RTTimerStart(pPromiscStream->pIp6Timer, 10 * (uint64_t)1000000000 /* 10 seconds to blastoff */);
+                Log((DEVICE_NAME ":vboxNetFltSolarisSetupIp6Polling: Ipv6 %d second timer begins firing in 10 seconds.\n",
+                     Interval));
+            }
+            else
+                LogRel((DEVICE_NAME ":vboxNetFltSolarisSetupIp6Polling: Failed to create timer. rc=%d\n", rc));
+        }
+        else
+        {
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisSetupIp6Polling: Polling already started.\n"));
+            rc = VINF_SUCCESS;
+        }
+    }
+    return rc;
+}
+#endif
+
+/**
+ * Wrapper for detaching ourselves from the interface.
+ *
+ * @returns VBox status code.
+ * @param   pThis           The instance.
+ * @remarks Owns the globals mutex, so re-requesting it anytime during this phase
+ *          would panic the system (e.g. in vboxNetFltSolarisFindInstance).
+ */
+static int vboxNetFltSolarisDetachFromInterface(PVBOXNETFLTINS pThis)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisDetachFromInterface pThis=%p\n", pThis));
+
+    ASMAtomicWriteBool(&pThis->fDisconnectedFromHost, true);
+    vboxNetFltSolarisCloseStream(pThis);
+    int rc = VINF_SUCCESS;
+    if (pThis->u.s.pIp4Stream)
+        rc = vboxNetFltSolarisAttachIp4(pThis, false /* fAttach */);
+    if (pThis->u.s.pIp6Stream)
+        rc = vboxNetFltSolarisAttachIp6(pThis, false /* fAttach */);
+
+#ifdef VBOXNETFLT_SOLARIS_IPV6_POLLING
+    vboxnetflt_promisc_stream_t *pPromiscStream = ASMAtomicUoReadPtrT(&pThis->u.s.pPromiscStream, vboxnetflt_promisc_stream_t *);
+    if (   pPromiscStream
+        && pPromiscStream->pIp6Timer == NULL)
+    {
+        RTTimerStop(pPromiscStream->pIp6Timer);
+        RTTimerDestroy(pPromiscStream->pIp6Timer);
+        ASMAtomicUoWriteNullPtr(&pPromiscStream->pIp6Timer);
+    }
+#endif
+
+    return rc;
+}
+
+
+/**
+ * Wrapper for attaching ourselves to the interface.
+ *
+ * @returns VBox status code.
+ * @param   pThis           The instance.
+ */
+static int vboxNetFltSolarisAttachToInterface(PVBOXNETFLTINS pThis)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisAttachToInterface pThis=%p\n", pThis));
+
+    /*
+     * Since this is asynchronous streams injection, let the attach succeed before we can start
+     * processing the stream.
+     */
+    ASMAtomicWriteBool(&pThis->fDisconnectedFromHost, true);
+    int rc = vboxNetFltSolarisOpenStream(pThis);
+    if (RT_SUCCESS(rc))
+    {
+        rc = vboxNetFltSolarisAttachIp4(pThis, true /* fAttach */);
+        if (RT_SUCCESS(rc))
+        {
+            /*
+             * Ipv6 attaching is optional and can fail. We don't bother to bring down the whole
+             * attach process just if Ipv6 interface is unavailable.
+             */
+            int rc2 = vboxNetFltSolarisAttachIp6(pThis, true /* fAttach */);
+
+#ifdef VBOXNETFLT_SOLARIS_IPV6_POLLING
+            /*
+             * If Ip6 interface is not plumbed and an Ip6 polling interval is specified, we need
+             * to begin polling to attach on the Ip6 interface whenever it comes up.
+             */
+            if (   rc2 == VERR_INTNET_FLT_IF_NOT_FOUND
+                && g_VBoxNetFltSolarisPollInterval != -1)
+            {
+                int rc3 = vboxNetFltSolarisSetupIp6Polling(pThis);
+                if (RT_FAILURE(rc3))
+                {
+                    /*
+                     * If we failed to setup Ip6 polling, warn in the release log and continue.
+                     */
+                    LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachToInterface IPv6 polling inactive. rc=%Rrc\n", rc3));
+                }
+            }
+#endif
+
+            /*
+             * Report promiscuousness and capabilities.
+             */
+            if (vboxNetFltTryRetainBusyNotDisconnected(pThis))
+            {
+                Assert(pThis->pSwitchPort);
+                /** @todo There is no easy way of obtaining the global host side promiscuous
+                 * counter. Currently we just return false.  */
+                pThis->pSwitchPort->pfnReportPromiscuousMode(pThis->pSwitchPort, false);
+                pThis->pSwitchPort->pfnReportGsoCapabilities(pThis->pSwitchPort, 0,  INTNETTRUNKDIR_WIRE | INTNETTRUNKDIR_HOST);
+                pThis->pSwitchPort->pfnReportNoPreemptDsts(pThis->pSwitchPort, 0 /* none */);
+                vboxNetFltRelease(pThis, true /*fBusy*/);
+            }
+
+            /*
+             * Ipv4 is successful, and maybe Ipv6, we're ready for transfers.
+             */
+            ASMAtomicWriteBool(&pThis->fDisconnectedFromHost, false);
+
+            return VINF_SUCCESS;
+        }
+
+        vboxNetFltSolarisCloseStream(pThis);
+    }
+    else
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachToInterface vboxNetFltSolarisOpenStream failed rc=%Rrc\n", rc));
+
+    return rc;
+}
+
+
+/**
+ * Create a solaris message block from the SG list.
+ *
+ * @returns Solaris message block.
+ * @param   pThis           The instance.
+ * @param   pSG             Pointer to the scatter-gather list.
+ * @param   fDst            The destination mask, INTNETTRUNKDIR_XXX. Ignored.
+ */
+static mblk_t *vboxNetFltSolarisMBlkFromSG(PVBOXNETFLTINS pThis, PINTNETSG pSG, uint32_t fDst)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisMBlkFromSG pThis=%p pSG=%p\n", pThis, pSG));
+
+    mblk_t *pMsg = allocb(pSG->cbTotal, BPRI_MED);
+    if (RT_UNLIKELY(!pMsg))
+    {
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisMBlkFromSG failed to alloc %d bytes for mblk_t.\n", pSG->cbTotal));
+        return NULL;
+    }
+
+    /*
+     * Single buffer copy. Maybe later explore the
+     * need/possibility for using a mblk_t chain rather.
+     */
+    for (unsigned i = 0; i < pSG->cSegsUsed; i++)
+    {
+        if (pSG->aSegs[i].pv)
+        {
+            bcopy(pSG->aSegs[i].pv, pMsg->b_wptr, pSG->aSegs[i].cb);
+            pMsg->b_wptr += pSG->aSegs[i].cb;
+        }
+    }
+    DB_TYPE(pMsg) = M_DATA;
+    return pMsg;
+}
+
+
+/**
+ * Calculate the number of segments required for this message block.
+ *
+ * @returns Number of segments.
+ * @param   pThis   The instance
+ * @param   pMsg    Pointer to the data message.
+ */
+static unsigned vboxNetFltSolarisMBlkCalcSGSegs(PVBOXNETFLTINS pThis, mblk_t *pMsg)
+{
+    unsigned cSegs = 0;
+    for (mblk_t *pCur = pMsg; pCur; pCur = pCur->b_cont)
+        if (MBLKL(pCur))
+            cSegs++;
+
+#ifdef PADD_RUNT_FRAMES_FROM_HOST
+    if (msgdsize(pMsg) < 60)
+        cSegs++;
+#endif
+
+    NOREF(pThis);
+    return RT_MAX(cSegs, 1);
+}
+
+
+/**
+ * Initializes an SG list from the given message block.
+ *
+ * @returns VBox status code.
+ * @param   pThis   The instance.
+ * @param   pMsg    Pointer to the data message.
+                    The caller must ensure it's not a control message block.
+ * @param   pSG     Pointer to the SG.
+ * @param   cSegs   Number of segments in the SG.
+ *                  This should match the number in the message block exactly!
+ * @param   fSrc    The source of the message.
+ */
+static int vboxNetFltSolarisMBlkToSG(PVBOXNETFLTINS pThis, mblk_t *pMsg, PINTNETSG pSG, unsigned cSegs, uint32_t fSrc)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisMBlkToSG pThis=%p pMsg=%p pSG=%p cSegs=%d\n", pThis, pMsg, pSG, cSegs));
+
+    /*
+     * Convert the message block to segments. Work INTNETSG::cbTotal.
+     */
+    IntNetSgInitTempSegs(pSG, 0 /*cbTotal*/, cSegs, 0 /*cSegsUsed*/);
+    mblk_t *pCur = pMsg;
+    unsigned iSeg = 0;
+    while (pCur)
+    {
+        size_t cbSeg = MBLKL(pCur);
+        if (cbSeg)
+        {
+            void *pvSeg = pCur->b_rptr;
+            pSG->aSegs[iSeg].pv = pvSeg;
+            pSG->aSegs[iSeg].cb = cbSeg;
+            pSG->aSegs[iSeg].Phys = NIL_RTHCPHYS;
+            pSG->cbTotal += cbSeg;
+            iSeg++;
+        }
+        pCur = pCur->b_cont;
+    }
+    pSG->cSegsUsed = iSeg;
+
+#ifdef PADD_RUNT_FRAMES_FROM_HOST
+    if (pSG->cbTotal < 60 && (fSrc & INTNETTRUNKDIR_HOST))
+    {
+        Log((DEVICE_NAME ":vboxNetFltSolarisMBlkToSG pulling up to length.\n"));
+
+        static uint8_t const s_abZero[128] = {0};
+        pSG->aSegs[iSeg].Phys = NIL_RTHCPHYS;
+        pSG->aSegs[iSeg].pv = (void *)&s_abZero[0];
+        pSG->aSegs[iSeg].cb = 60 - pSG->cbTotal;
+        pSG->cbTotal = 60;
+        pSG->cSegsUsed++;
+        Assert(iSeg + 1 < cSegs);
+    }
+#endif
+
+    Log((DEVICE_NAME ":vboxNetFltSolarisMBlkToSG iSeg=%d pSG->cbTotal=%d msgdsize=%d\n", iSeg, pSG->cbTotal, msgdsize(pMsg)));
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Converts raw mode M_DATA messages to M_PROTO DL_UNITDATA_IND format.
+ *
+ * @returns VBox status code.
+ * @param   pMsg        Pointer to the raw message.
+ * @param   ppDlpiMsg   Where to store the M_PROTO message.
+ *
+ * @remarks The original raw message would be no longer valid and will be
+ *          linked as part of the new DLPI message. Callers must take care
+ *          not to use the raw message if this routine is successful.
+ */
+static int vboxNetFltSolarisRawToUnitData(mblk_t *pMsg, mblk_t **ppDlpiMsg)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisRawToUnitData pMsg=%p\n", pMsg));
+
+    if (DB_TYPE(pMsg) != M_DATA)
+        return VERR_NO_MEMORY;
+
+    size_t cbMsg = sizeof(dl_unitdata_ind_t) + 2 * sizeof(vboxnetflt_dladdr_t);
+    mblk_t *pDlpiMsg = allocb(cbMsg, BPRI_MED);
+    if (RT_UNLIKELY(!pDlpiMsg))
+        return VERR_NO_MEMORY;
+
+    DB_TYPE(pDlpiMsg) = M_PROTO;
+    dl_unitdata_ind_t *pDlpiData = (dl_unitdata_ind_t *)pDlpiMsg->b_rptr;
+    pDlpiData->dl_primitive = DL_UNITDATA_IND;
+    pDlpiData->dl_dest_addr_length = VBOXNETFLT_DLADDRL;
+    pDlpiData->dl_dest_addr_offset = sizeof(dl_unitdata_ind_t);
+    pDlpiData->dl_src_addr_length = VBOXNETFLT_DLADDRL;
+    pDlpiData->dl_src_addr_offset = VBOXNETFLT_DLADDRL + sizeof(dl_unitdata_ind_t);
+
+    PRTNETETHERHDR pEthHdr = (PRTNETETHERHDR)pMsg->b_rptr;
+
+    vboxnetflt_dladdr_t *pDlAddr = (vboxnetflt_dladdr_t *)(pDlpiMsg->b_rptr + pDlpiData->dl_dest_addr_offset);
+    pDlAddr->SAP = RT_BE2H_U16(pEthHdr->EtherType);
+    bcopy(&pEthHdr->DstMac, &pDlAddr->Mac, sizeof(RTMAC));
+
+    pDlAddr = (vboxnetflt_dladdr_t *)(pDlpiMsg->b_rptr + pDlpiData->dl_src_addr_offset);
+    pDlAddr->SAP = RT_BE2H_U16(pEthHdr->EtherType);
+    bcopy(&pEthHdr->SrcMac, &pDlAddr->Mac, sizeof(RTMAC));
+
+    pDlpiMsg->b_wptr = pDlpiMsg->b_rptr + cbMsg;
+
+    /* Make the message point to the protocol header */
+    pMsg->b_rptr += sizeof(RTNETETHERHDR);
+
+    pDlpiMsg->b_cont = pMsg;
+    *ppDlpiMsg = pDlpiMsg;
+    return VINF_SUCCESS;
+}
+
+#if 0
+/**
+ * Converts DLPI M_PROTO messages to the raw mode M_DATA format.
+ *
+ * @returns VBox status code.
+ * @param   pMsg        Pointer to the M_PROTO message.
+ * @param   ppRawMsg    Where to store the converted message.
+ *
+ * @remarks If successful, the original pMsg is no longer valid, it will be deleted.
+ *          Callers must take care not to continue to use pMsg after a successful
+ *          call to this conversion routine.
+ */
+static int vboxNetFltSolarisUnitDataToRaw(PVBOXNETFLTINS pThis, mblk_t *pMsg, mblk_t **ppRawMsg)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisUnitDataToRaw pMsg=%p\n", pMsg));
+
+    if (   !pMsg->b_cont
+        || DB_TYPE(pMsg) != M_PROTO)
+    {
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisUnitDataToRaw invalid input message.\n"));
+        return VERR_NET_PROTOCOL_ERROR;
+    }
+
+    /*
+     * Upstream consumers send/receive packets in the fast path mode.
+     * We of course need to convert them into raw ethernet frames.
+     */
+    RTNETETHERHDR EthHdr;
+    union DL_primitives *pPrim = (union DL_primitives *)pMsg->b_rptr;
+    switch (pPrim->dl_primitive)
+    {
+        case DL_UNITDATA_IND:
+        {
+            /*
+             * Receive side.
+             */
+            dl_unitdata_ind_t *pDlpiMsg = (dl_unitdata_ind_t *)pMsg->b_rptr;
+            bcopy(pMsg->b_rptr + pDlpiMsg->dl_dest_addr_offset, &EthHdr.DstMac, sizeof(EthHdr.DstMac));
+            bcopy(pMsg->b_rptr + pDlpiMsg->dl_src_addr_offset, &EthHdr.SrcMac, sizeof(EthHdr.SrcMac));
+
+            vboxnetflt_dladdr_t *pDLSapAddr = (vboxnetflt_dladdr_t *)(pMsg->b_rptr + pDlpiMsg->dl_dest_addr_offset);
+            EthHdr.EtherType = RT_H2BE_U16(pDLSapAddr->SAP);
+
+            break;
+        }
+
+        case DL_UNITDATA_REQ:
+        {
+            /*
+             * Send side.
+             */
+            dl_unitdata_req_t *pDlpiMsg = (dl_unitdata_req_t *)pMsg->b_rptr;
+
+            bcopy(pMsg->b_rptr + pDlpiMsg->dl_dest_addr_offset, &EthHdr.DstMac, sizeof(EthHdr.DstMac));
+            bcopy(&pThis->u.s.MacAddr, &EthHdr.SrcMac, sizeof(EthHdr.SrcMac));
+
+            vboxnetflt_dladdr_t *pDLSapAddr = (vboxnetflt_dladdr_t *)(pMsg->b_rptr + pDlpiMsg->dl_dest_addr_offset);
+            EthHdr.EtherType = RT_H2BE_U16(pDLSapAddr->SAP);
+
+            break;
+        }
+
+        default:
+        {
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisUnitDataToRaw Unknown M_PROTO. This shouldn't be happening!!"));
+            return VERR_NET_PROTOCOL_ERROR;
+        }
+    }
+
+    /*
+     * Let us just link it as a mblk_t chain rather than re-copy the entire message.
+     * The vboxNetFltSolarisMBlkToSG function will handle chained mblk_t's.
+     */
+    size_t cbLen = sizeof(EthHdr);
+    mblk_t *pEtherMsg = allocb(cbLen, BPRI_MED);
+    if (RT_UNLIKELY(!pEtherMsg))
+        return VERR_NO_MEMORY;
+
+    DB_TYPE(pEtherMsg) = M_DATA;
+    bcopy(&EthHdr, pEtherMsg->b_wptr, sizeof(EthHdr));
+    pEtherMsg->b_wptr += cbLen;
+
+    pEtherMsg->b_cont = pMsg->b_cont;
+
+    /*
+     * Change the chained blocks to type M_DATA.
+     */
+    for (mblk_t *pTmp = pEtherMsg->b_cont; pTmp; pTmp = pTmp->b_cont)
+        DB_TYPE(pTmp) = M_DATA;
+
+    pMsg->b_cont = NULL;
+    freemsg(pMsg);
+
+    *ppRawMsg = pEtherMsg;
+    return VINF_SUCCESS;
+}
+#endif
+
+/**
+ * Initializes a packet identifier.
+ *
+ * @param   pTag        Pointer to the packed identifier.
+ * @param   pMsg        Pointer to the message to be identified.
+ *
+ * @remarks Warning!!! This function assumes 'pMsg' is an unchained message.
+ */
+static inline void vboxNetFltSolarisInitPacketId(PVBOXNETFLTPACKETID pTag, mblk_t *pMsg)
+{
+    PCRTNETETHERHDR pEthHdr = (PCRTNETETHERHDR)pMsg->b_rptr;
+    size_t cbMsg = MBLKL(pMsg);
+
+    pTag->cbPacket = cbMsg;
+    pTag->Checksum = RTCrc32(pMsg->b_rptr, cbMsg);
+    bcopy(&pEthHdr->SrcMac, &pTag->SrcMac, sizeof(RTMAC));
+    bcopy(&pEthHdr->DstMac, &pTag->DstMac, sizeof(RTMAC));
+}
+
+
+/**
+ * Queues a packet for loopback elimination.
+ *
+ * @returns VBox status code.
+ * @param   pThis               The instance.
+ * @param   pPromiscStream      Pointer to the promiscuous stream.
+ * @param   pMsg                Pointer to the message.
+ */
+static int vboxNetFltSolarisQueueLoopback(PVBOXNETFLTINS pThis, vboxnetflt_promisc_stream_t *pPromiscStream, mblk_t *pMsg)
+{
+    Assert(pThis);
+    Assert(pMsg);
+    Assert(DB_TYPE(pMsg) == M_DATA);
+    Assert(pPromiscStream);
+
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisQueueLoopback pThis=%p pPromiscStream=%p pMsg=%p\n", pThis, pPromiscStream, pMsg));
+
+    if (RT_UNLIKELY(pMsg->b_cont))
+    {
+        /*
+         * We don't currently make chained messages in on Xmit
+         * so this only needs to be supported when we do that.
+         */
+        return VERR_NOT_SUPPORTED;
+    }
+
+    size_t cbMsg = MBLKL(pMsg);
+    if (RT_UNLIKELY(cbMsg < sizeof(RTNETETHERHDR)))
+        return VERR_NET_MSG_SIZE;
+
+    int rc = VINF_SUCCESS;
+    mutex_enter(&pThis->u.s.hMtx);
+
+    PVBOXNETFLTPACKETID pCur = NULL;
+    if (pPromiscStream->cLoopback < VBOXNETFLT_LOOPBACK_SIZE
+        || (   pPromiscStream->pHead
+            && pPromiscStream->pHead->cbPacket == 0))
+    {
+        do
+        {
+            if (!pPromiscStream->pHead)
+            {
+                pCur = RTMemAlloc(sizeof(VBOXNETFLTPACKETID));
+                if (RT_UNLIKELY(!pCur))
+                {
+                    rc = VERR_NO_MEMORY;
+                    break;
+                }
+
+                vboxNetFltSolarisInitPacketId(pCur, pMsg);
+
+                pCur->pNext = NULL;
+                pPromiscStream->pHead = pCur;
+                pPromiscStream->pTail = pCur;
+                pPromiscStream->cLoopback++;
+
+                Log((DEVICE_NAME ":vboxNetFltSolarisQueueLoopback initialized head. checksum=%u.\n",
+                        pPromiscStream->pHead->Checksum));
+                break;
+            }
+            else if (   pPromiscStream->pHead
+                     && pPromiscStream->pHead->cbPacket == 0)
+            {
+                pCur = pPromiscStream->pHead;
+                vboxNetFltSolarisInitPacketId(pCur, pMsg);
+
+                Log((DEVICE_NAME ":vboxNetFltSolarisQueueLoopback re-used head checksum=%u cLoopback=%d.\n",
+                        pCur->Checksum, pPromiscStream->cLoopback));
+                break;
+            }
+            else
+            {
+                pCur = RTMemAlloc(sizeof(VBOXNETFLTPACKETID));
+                if (RT_UNLIKELY(!pCur))
+                {
+                    rc = VERR_NO_MEMORY;
+                    break;
+                }
+
+                vboxNetFltSolarisInitPacketId(pCur, pMsg);
+
+                pCur->pNext = pPromiscStream->pHead;
+                pPromiscStream->pHead = pCur;
+                pPromiscStream->cLoopback++;
+
+                Log((DEVICE_NAME ":vboxNetFltSolarisQueueLoopback added head checksum=%u cLoopback=%d.\n", pCur->Checksum,
+                        pPromiscStream->cLoopback));
+                break;
+            }
+        } while (0);
+    }
+    else
+    {
+        /*
+         * Maximum loopback queue size reached. Re-use tail as head.
+         */
+        Assert(pPromiscStream->pHead);
+        Assert(pPromiscStream->pTail);
+
+        /*
+         * Find tail's previous item.
+         */
+        PVBOXNETFLTPACKETID pPrev = NULL;
+        pCur = pPromiscStream->pHead;
+
+        /** @todo consider if this is worth switching to a double linked list... */
+        while (pCur != pPromiscStream->pTail)
+        {
+            pPrev = pCur;
+            pCur = pCur->pNext;
+        }
+
+        pPromiscStream->pTail = pPrev;
+        pPromiscStream->pTail->pNext = NULL;
+        pCur->pNext = pPromiscStream->pHead;
+        pPromiscStream->pHead = pCur;
+
+        vboxNetFltSolarisInitPacketId(pCur, pMsg);
+        Log((DEVICE_NAME ":vboxNetFltSolarisQueueLoopback recycled tail!! checksum=%u cLoopback=%d\n", pCur->Checksum,
+                pPromiscStream->cLoopback));
+    }
+
+    mutex_exit(&pThis->u.s.hMtx);
+
+    return rc;
+}
+
+
+/**
+ * Checks if the packet is enqueued for loopback as our own packet.
+ *
+ * @returns If it's our packet, returns true after dequeuing it, otherwise false.
+ * @param   pThis               The instance.
+ * @param   pPromiscStream      Pointer to the promiscuous stream.
+ * @param   pMsg                Pointer to the message.
+ */
+static bool vboxNetFltSolarisIsOurMBlk(PVBOXNETFLTINS pThis, vboxnetflt_promisc_stream_t *pPromiscStream, mblk_t *pMsg)
+{
+    Assert(pThis);
+    Assert(pPromiscStream);
+    Assert(pMsg);
+    Assert(DB_TYPE(pMsg) == M_DATA);
+
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisIsOurMBlk pThis=%p pMsg=%p\n", pThis, pMsg));
+
+    if (pMsg->b_cont)
+    {
+        /** Handle this when Xmit makes chained messages */
+        return false;
+    }
+
+    size_t cbMsg = MBLKL(pMsg);
+    if (cbMsg < sizeof(RTNETETHERHDR))
+        return false;
+
+    mutex_enter(&pThis->u.s.hMtx);
+
+    PVBOXNETFLTPACKETID pPrev = NULL;
+    PVBOXNETFLTPACKETID pCur = pPromiscStream->pHead;
+    bool fIsOurPacket = false;
+    while (pCur)
+    {
+        PCRTNETETHERHDR pEthHdr = (PCRTNETETHERHDR)pMsg->b_rptr;
+        if (   pCur->cbPacket != cbMsg
+            || pCur->SrcMac.au8[0] != pEthHdr->SrcMac.au8[0]
+            || pCur->SrcMac.au8[1] != pEthHdr->SrcMac.au8[1]
+            || pCur->SrcMac.au8[2] != pEthHdr->SrcMac.au8[2]
+            || pCur->SrcMac.au8[3] != pEthHdr->SrcMac.au8[3]
+            || pCur->SrcMac.au8[4] != pEthHdr->SrcMac.au8[4]
+            || pCur->SrcMac.au8[5] != pEthHdr->SrcMac.au8[5]
+            || pCur->DstMac.au8[0] != pEthHdr->DstMac.au8[0]
+            || pCur->DstMac.au8[1] != pEthHdr->DstMac.au8[1]
+            || pCur->DstMac.au8[2] != pEthHdr->DstMac.au8[2]
+            || pCur->DstMac.au8[3] != pEthHdr->DstMac.au8[3]
+            || pCur->DstMac.au8[4] != pEthHdr->DstMac.au8[4]
+            || pCur->DstMac.au8[5] != pEthHdr->DstMac.au8[5])
+        {
+            pPrev = pCur;
+            pCur = pCur->pNext;
+            continue;
+        }
+
+        uint16_t Checksum = RTCrc32(pMsg->b_rptr, cbMsg);
+        if (pCur->Checksum != Checksum)
+        {
+            pPrev = pCur;
+            pCur = pCur->pNext;
+            continue;
+        }
+
+        /*
+         * Yes, it really is our own packet, mark it as handled
+         * and move it as a "free slot" to the head and return success.
+         */
+        pCur->cbPacket = 0;
+        if (pPrev)
+        {
+            if (!pCur->pNext)
+                pPromiscStream->pTail = pPrev;
+
+            pPrev->pNext = pCur->pNext;
+            pCur->pNext = pPromiscStream->pHead;
+            pPromiscStream->pHead = pCur;
+        }
+        fIsOurPacket = true;
+
+        Log((DEVICE_NAME ":vboxNetFltSolarisIsOurMBlk found packet %p Checksum=%u cLoopback=%d\n", pMsg, Checksum,
+                    pPromiscStream->cLoopback));
+        break;
+    }
+
+    Log((DEVICE_NAME ":vboxNetFltSolarisIsOurMBlk returns %d.\n", fIsOurPacket));
+    mutex_exit(&pThis->u.s.hMtx);
+    return fIsOurPacket;
+}
+
+
+/**
+ * Helper.
+ */
+DECLINLINE(bool) vboxNetFltPortSolarisIsHostMac(PVBOXNETFLTINS pThis, PCRTMAC pMac)
+{
+    /*
+     * MAC address change acknowledgements are intercepted on the read side
+     * hence theoretically we are always update to date with any changes.
+     */
+    return pThis->u.s.MacAddr.au16[0] == pMac->au16[0]
+        && pThis->u.s.MacAddr.au16[1] == pMac->au16[1]
+        && pThis->u.s.MacAddr.au16[2] == pMac->au16[2];
+}
+
+
+/**
+ * Worker for routing messages from the wire or from the host.
+ *
+ * @returns VBox status code.
+ * @param   pThis       The instance.
+ * @param   pStream     Pointer to the stream.
+ * @param   pQueue      Pointer to the read queue.
+ * @param   pMsg        Pointer to the message.
+ */
+static int vboxNetFltSolarisRecv(PVBOXNETFLTINS pThis, vboxnetflt_stream_t *pStream, queue_t *pQueue, mblk_t *pMsg)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisRecv pThis=%p pMsg=%p\n", pThis, pMsg));
+
+    AssertCompile(sizeof(struct ether_header) == sizeof(RTNETETHERHDR));
+    Assert(pStream->Type == kPromiscStream);
+
+    vboxnetflt_promisc_stream_t *pPromiscStream = ASMAtomicUoReadPtrT(&pThis->u.s.pPromiscStream, vboxnetflt_promisc_stream_t *);
+    if (RT_UNLIKELY(!pPromiscStream))
+    {
+        LogRel((DEVICE_NAME ":Promiscuous stream missing!! Failing to receive packet.\n"));
+        return VERR_INVALID_POINTER;
+    }
+
+    /*
+     * Paranoia...
+     */
+    if (RT_UNLIKELY(MBLKL(pMsg) < sizeof(RTNETETHERHDR)))
+    {
+        size_t cbMsg = msgdsize(pMsg);
+        if (cbMsg < sizeof(RTNETETHERHDR))
+        {
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisRecv %s: packet too small. Dropping packet.\n", pThis->szName));
+            return VINF_SUCCESS;
+        }
+
+        mblk_t *pFullMsg = msgpullup(pMsg, -1 /* all data blocks */);
+        if (pFullMsg)
+        {
+            freemsg(pMsg);
+            pMsg = pFullMsg;
+        }
+        else
+        {
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisRecv msgpullup failed.\n"));
+            return VERR_NO_MEMORY;
+        }
+    }
+
+    /*
+     * Don't loopback packets we transmit to the wire.
+     */
+    if (vboxNetFltSolarisIsOurMBlk(pThis, pPromiscStream, pMsg))
+    {
+        Log((DEVICE_NAME ":Avoiding packet loopback.\n"));
+        return VINF_SUCCESS;
+    }
+
+    /*
+     * Figure out the source of the packet based on the source Mac address.
+     */
+    uint32_t fSrc = INTNETTRUNKDIR_WIRE;
+    PRTNETETHERHDR pEthHdr = (PRTNETETHERHDR)pMsg->b_rptr;
+    if (vboxNetFltPortSolarisIsHostMac(pThis, &pEthHdr->SrcMac))
+        fSrc = INTNETTRUNKDIR_HOST;
+
+    /*
+     * Afaik; we no longer need to worry about incorrect checksums because we now use
+     * a dedicated stream and don't intercept packets under IP/ARP which might be doing
+     * checksum offloading.
+     */
+#if 0
+    if (fSrc & INTNETTRUNKDIR_HOST)
+    {
+        mblk_t *pCorrectedMsg = vboxNetFltSolarisFixChecksums(pMsg);
+        if (pCorrectedMsg)
+            pMsg = pCorrectedMsg;
+    }
+    vboxNetFltSolarisAnalyzeMBlk(pMsg);
+#endif
+
+    /*
+     * Solaris raw mode streams for priority-tagged VLAN does not strip the VLAN tag.
+     * It zero's the VLAN-Id but keeps the tag intact as part of the Ethernet header.
+     * We need to manually strip these tags out or the guests might get confused.
+     */
+    bool fCopied = false;
+    bool fTagged = false;
+    if (   pThis->u.s.fVLAN
+        && pPromiscStream->fRawMode)
+    {
+        if (pEthHdr->EtherType == RT_H2BE_U16(RTNET_ETHERTYPE_VLAN))
+        {
+            if (msgdsize(pMsg) > sizeof(RTNETETHERHDR) + sizeof(VLANHEADER))
+            {
+                if (pMsg->b_cont)
+                {
+                    mblk_t *pFullMsg = msgpullup(pMsg, -1 /* all data blocks */);
+                    if (pFullMsg)
+                    {
+                        /* Original pMsg will be freed by the caller */
+                        pMsg = pFullMsg;
+                        fCopied = true;
+                    }
+                    else
+                    {
+                        LogRel((DEVICE_NAME ":vboxNetFltSolarisRecv msgpullup failed.\n"));
+                        return VERR_NO_MEMORY;
+                    }
+                }
+
+                PVLANHEADER pVlanHdr = (PVLANHEADER)(pMsg->b_rptr + sizeof(RTNETETHERHDR) - sizeof(pEthHdr->EtherType));
+                Log((DEVICE_NAME ":Recv VLAN Pcp=%u Cfi=%u Id=%u\n", VLAN_PRI(RT_BE2H_U16(pVlanHdr->Data)),
+                            VLAN_CFI(RT_BE2H_U16(pVlanHdr->Data)), VLAN_ID(RT_BE2H_U16(pVlanHdr->Data))));
+                if (   VLAN_PRI(RT_BE2H_U16(pVlanHdr->Data)) > 0
+                    && VLAN_ID(RT_BE2H_U16(pVlanHdr->Data)) == 0)
+                {
+                    /*
+                     * Create new Ethernet header with stripped VLAN tag.
+                     */
+                    size_t cbEthPrefix = sizeof(RTNETETHERHDR) - sizeof(pEthHdr->EtherType);
+                    mblk_t *pStrippedMsg = allocb(cbEthPrefix, BPRI_MED);
+                    if (RT_LIKELY(pStrippedMsg))
+                    {
+                        fTagged = true;
+
+                        /*
+                         * Copy ethernet header excluding the ethertype.
+                         */
+                        bcopy(pMsg->b_rptr, pStrippedMsg->b_wptr, cbEthPrefix);
+                        pStrippedMsg->b_wptr += cbEthPrefix;
+
+                        /*
+                         * Link the rest of the message (ethertype + data, skipping VLAN header).
+                         */
+                        pMsg->b_rptr += cbEthPrefix + sizeof(VLANHEADER);
+                        pStrippedMsg->b_cont = pMsg;
+                        pMsg = pStrippedMsg;
+                        Log((DEVICE_NAME ":Stripped VLAN tag.\n"));
+                    }
+                    else
+                    {
+                        LogRel((DEVICE_NAME ":vboxNetFltSolarisRecv insufficient memory for creating VLAN stripped packet"
+                                " cbMsg=%u.\n", cbEthPrefix));
+                        if (fCopied)
+                            freemsg(pMsg);
+                        return VERR_NO_MEMORY;
+                    }
+                }
+            }
+        }
+    }
+
+    /*
+     * Route all received packets into the internal network.
+     */
+    unsigned cSegs = vboxNetFltSolarisMBlkCalcSGSegs(pThis, pMsg);
+    PINTNETSG pSG = (PINTNETSG)alloca(RT_UOFFSETOF_DYN(INTNETSG, aSegs[cSegs]));
+    int rc = vboxNetFltSolarisMBlkToSG(pThis, pMsg, pSG, cSegs, fSrc);
+    if (RT_SUCCESS(rc))
+        pThis->pSwitchPort->pfnRecv(pThis->pSwitchPort, NULL /* pvIf */, pSG, fSrc);
+    else
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisMBlkToSG failed. rc=%d\n", rc));
+
+    /*
+     * If we've allocated the prefix before the VLAN tag in a new message, free that.
+     */
+    if (fTagged)
+    {
+        mblk_t *pTagMsg = pMsg->b_cont;
+        pMsg->b_cont = NULL; /* b_cont could be the message from the caller or a copy we made (fCopied) */
+        freemsg(pMsg);
+        pMsg = pTagMsg;
+    }
+
+    /*
+     * If we made an extra copy for VLAN stripping, we need to free that ourselves.
+     */
+    if (fCopied)
+        freemsg(pMsg);
+
+    return VINF_SUCCESS;
+}
+
+#if 0
+/**
+ * Finalize the message to be fed into the internal network.
+ * Verifies and tries to fix checksums for TCP, UDP and IP.
+ *
+ * @returns Corrected message or NULL if no change was required.
+ * @param   pMsg    Pointer to the message block.
+ *                  This must not be DLPI linked messages, must be M_DATA.
+ *
+ * @remarks If this function returns a checksum adjusted message, the
+ *          passed in input message has been freed and should not be
+ *          referenced anymore by the caller.
+ */
+static mblk_t *vboxNetFltSolarisFixChecksums(mblk_t *pMsg)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisFixChecksums pMsg=%p\n"));
+
+    Assert(DB_TYPE(pMsg) == M_DATA);
+
+    if (MBLKL(pMsg) < sizeof(RTNETETHERHDR))
+    {
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisFixChecksums Packet shorter than ethernet header size!\n"));
+        return NULL;
+    }
+
+    PRTNETETHERHDR pEthHdr = (PRTNETETHERHDR)pMsg->b_rptr;
+    if (pEthHdr->EtherType == RT_H2BE_U16(RTNET_ETHERTYPE_IPV4))
+    {
+        /*
+         * Check if we have a complete packet or being fed a chain.
+         */
+        size_t cbIpPacket = 0;
+        mblk_t *pFullMsg = NULL;
+        if (pMsg->b_cont)
+        {
+            Log((DEVICE_NAME ":Chained mblk_t.\n"));
+
+            /*
+             * Handle chain by making a packet copy to verify if the IP checksum is correct.
+             * Contributions to calculating IP checksums from a chained message block with
+             * odd/non-pulled up sizes are welcome.
+             */
+            size_t cbFullMsg = msgdsize(pMsg);
+            mblk_t *pFullMsg = allocb(cbFullMsg, BPRI_MED);
+            Log((DEVICE_NAME ":msgdsize returns %d\n", cbFullMsg));
+            if (RT_UNLIKELY(!pFullMsg))
+            {
+                LogRel((DEVICE_NAME ":vboxNetFltSolarisFixChecksums failed to alloc new message of %d bytes.\n", cbFullMsg));
+                return NULL;
+            }
+
+            for (mblk_t *pTmp = pMsg; pTmp; pTmp = pTmp->b_cont)
+            {
+                if (DB_TYPE(pTmp) == M_DATA)
+                {
+                    bcopy(pTmp->b_rptr, pFullMsg->b_wptr, MBLKL(pTmp));
+                    pFullMsg->b_wptr += MBLKL(pTmp);
+                }
+            }
+
+            DB_TYPE(pFullMsg) = M_DATA;
+            pEthHdr = (PRTNETETHERHDR)pFullMsg->b_rptr;
+            cbIpPacket = MBLKL(pFullMsg) - sizeof(RTNETETHERHDR);
+        }
+        else
+            cbIpPacket = MBLKL(pMsg) - sizeof(RTNETETHERHDR);
+
+        /*
+         * Check if the IP checksum is valid.
+         */
+        uint8_t *pbProtocol = (uint8_t *)(pEthHdr + 1);
+        PRTNETIPV4 pIpHdr = (PRTNETIPV4)pbProtocol;
+        size_t cbPayload = cbIpPacket - (pIpHdr->ip_hl << 2);
+        bool fChecksumAdjusted = false;
+        if (RTNetIPv4IsHdrValid(pIpHdr, cbPayload, cbPayload))
+        {
+            pbProtocol += (pIpHdr->ip_hl << 2);
+
+            /*
+             * Fix up TCP/UDP and IP checksums if they're incomplete/invalid.
+             */
+            if (pIpHdr->ip_p == RTNETIPV4_PROT_TCP)
+            {
+                PRTNETTCP pTcpHdr = (PRTNETTCP)pbProtocol;
+                uint16_t TcpChecksum = RTNetIPv4TCPChecksum(pIpHdr, pTcpHdr, NULL);
+                if (pTcpHdr->th_sum != TcpChecksum)
+                {
+                    pTcpHdr->th_sum = TcpChecksum;
+                    fChecksumAdjusted = true;
+                    Log((DEVICE_NAME ":fixed TCP checksum.\n"));
+                }
+            }
+            else if (pIpHdr->ip_p == RTNETIPV4_PROT_UDP)
+            {
+                PRTNETUDP pUdpHdr = (PRTNETUDP)pbProtocol;
+                uint16_t UdpChecksum = RTNetIPv4UDPChecksum(pIpHdr, pUdpHdr, pUdpHdr + 1);
+
+                if (pUdpHdr->uh_sum != UdpChecksum)
+                {
+                    pUdpHdr->uh_sum = UdpChecksum;
+                    fChecksumAdjusted = true;
+                    Log((DEVICE_NAME ":Fixed UDP checksum."));
+                }
+            }
+        }
+
+        if (fChecksumAdjusted)
+        {
+            /*
+             * If we made a copy and the checksum is corrected on the copy,
+             * free the original, return the checksum fixed copy.
+             */
+            if (pFullMsg)
+            {
+                freemsg(pMsg);
+                return pFullMsg;
+            }
+
+            return pMsg;
+        }
+
+        /*
+         * If we made a copy and the checksum is NOT corrected, free the copy,
+         * and return NULL.
+         */
+        if (pFullMsg)
+            freemsg(pFullMsg);
+
+        return NULL;
+    }
+
+    return NULL;
+}
+
+
+/**
+ * Simple packet dump, used for internal debugging.
+ *
+ * @param   pMsg    Pointer to the message to analyze and dump.
+ */
+static void vboxNetFltSolarisAnalyzeMBlk(mblk_t *pMsg)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisAnalyzeMBlk pMsg=%p\n", pMsg));
+
+    PCRTNETETHERHDR pEthHdr = (PCRTNETETHERHDR)pMsg->b_rptr;
+    uint8_t *pb = pMsg->b_rptr;
+    if (pEthHdr->EtherType == RT_H2BE_U16(RTNET_ETHERTYPE_IPV4))
+    {
+        PRTNETIPV4 pIpHdr = (PRTNETIPV4)(pEthHdr + 1);
+        size_t cbLen = MBLKL(pMsg) - sizeof(*pEthHdr);
+        if (!pMsg->b_cont)
+        {
+            if (pIpHdr->ip_p == RTNETIPV4_PROT_ICMP)
+                LogRel((DEVICE_NAME ":ICMP D=%.6Rhxs  S=%.6Rhxs  T=%04x\n", pb, pb + 6, RT_BE2H_U16(*(uint16_t *)(pb + 12))));
+            else if (pIpHdr->ip_p == RTNETIPV4_PROT_TCP)
+                LogRel((DEVICE_NAME ":TCP D=%.6Rhxs  S=%.6Rhxs\n", pb, pb + 6));
+            else if (pIpHdr->ip_p == RTNETIPV4_PROT_UDP)
+            {
+                PCRTNETUDP pUdpHdr = (PCRTNETUDP)((uint32_t *)pIpHdr + pIpHdr->ip_hl);
+                if (   RT_BE2H_U16(pUdpHdr->uh_sport) == 67
+                    && RT_BE2H_U16(pUdpHdr->uh_dport) == 68)
+                {
+                    LogRel((DEVICE_NAME ":UDP bootp ack D=%.6Rhxs S=%.6Rhxs UDP_CheckSum=%04x Computex=%04x\n", pb, pb + 6,
+                                RT_BE2H_U16(pUdpHdr->uh_sum), RT_BE2H_U16(RTNetIPv4UDPChecksum(pIpHdr, pUdpHdr, pUdpHdr + 1))));
+                }
+            }
+        }
+        else
+        {
+            Log((DEVICE_NAME ":Chained IP packet. Skipping validity check.\n"));
+        }
+    }
+    else if (pEthHdr->EtherType == RT_H2BE_U16(RTNET_ETHERTYPE_VLAN))
+    {
+        PVLANHEADER pVlanHdr = (PVLANHEADER)(pMsg->b_rptr + sizeof(RTNETETHERHDR) - sizeof(pEthHdr->EtherType));
+        LogRel((DEVICE_NAME ":VLAN Pcp=%u Cfi=%u Id=%u\n", VLAN_PRI(RT_BE2H_U16(pVlanHdr->Data)),
+               VLAN_CFI(RT_BE2H_U16(pVlanHdr->Data)), VLAN_ID(RT_BE2H_U16(pVlanHdr->Data))));
+        LogRel((DEVICE_NAME "%.*Rhxd\n", sizeof(VLANHEADER), pVlanHdr));
+    }
+    else if (pEthHdr->EtherType == RT_H2BE_U16(RTNET_ETHERTYPE_ARP))
+    {
+        PRTNETARPHDR pArpHdr = (PRTNETARPHDR)(pEthHdr + 1);
+        LogRel((DEVICE_NAME ":ARP Op=%d\n", pArpHdr->ar_oper));
+    }
+    else if (pEthHdr->EtherType == RT_H2BE_U16(RTNET_ETHERTYPE_IPV6))
+    {
+        LogRel((DEVICE_NAME ":IPv6 D=%.6Rhxs S=%.6Rhxs\n", pb, pb + 6));
+    }
+    else if (pEthHdr->EtherType == RT_H2BE_U16(RTNET_ETHERTYPE_IPX_1)
+             || pEthHdr->EtherType == RT_H2BE_U16(RTNET_ETHERTYPE_IPX_2)
+             || pEthHdr->EtherType == RT_H2BE_U16(RTNET_ETHERTYPE_IPX_3))
+    {
+        LogRel((DEVICE_NAME ":IPX packet.\n"));
+    }
+    else
+    {
+        LogRel((DEVICE_NAME ":Unknown EtherType=%x D=%.6Rhxs S=%.6Rhxs\n", RT_H2BE_U16(pEthHdr->EtherType), &pEthHdr->DstMac,
+                    &pEthHdr->SrcMac));
+        /* Log((DEVICE_NAME ":%.*Rhxd\n", MBLKL(pMsg), pMsg->b_rptr)); */
+    }
+}
+#endif
+
+
+/* -=-=-=-=-=- Common Hooks -=-=-=-=-=- */
+
+
+
+void vboxNetFltPortOsSetActive(PVBOXNETFLTINS pThis, bool fActive)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltPortOsSetActive pThis=%p fActive=%d\n", pThis, fActive));
+
+    /*
+     * Enable/disable promiscuous mode.
+     */
+    vboxnetflt_promisc_params_t *pData = RTMemAllocZ(sizeof(vboxnetflt_promisc_params_t));
+    if (RT_LIKELY(pData))
+    {
+        /*
+         * See @bugref{5262} as to why we need to do all this qtimeout/qwriter tricks.
+         */
+        vboxnetflt_promisc_stream_t *pPromiscStream = ASMAtomicUoReadPtrT(&pThis->u.s.pPromiscStream,
+                                                                          vboxnetflt_promisc_stream_t *);
+        if (   pPromiscStream
+            && pPromiscStream->Stream.pReadQueue)
+        {
+            pData->pThis      = pThis;
+            pData->fPromiscOn = fActive;
+            if (ASMAtomicReadPtr(&pPromiscStream->TimeoutId))
+                quntimeout(WR(pPromiscStream->Stream.pReadQueue), pPromiscStream->TimeoutId);
+            timeout_id_t TimeoutId = qtimeout(WR(pPromiscStream->Stream.pReadQueue), vboxNetFltSolarisPromiscReqWrap,
+                                              pData, 1 /* ticks */);
+            ASMAtomicWritePtr(&pPromiscStream->TimeoutId, TimeoutId);
+            return; /* pData will be freed by vboxNetFltSolarisPromiscReqWrap() */
+        }
+        else
+            LogRel((DEVICE_NAME ":vboxNetFltPortOsSetActive pThis=%p fActive=%d missing stream!\n", pThis, fActive));
+        RTMemFree(pData);
+    }
+    else
+        LogRel((DEVICE_NAME ":vboxNetFltPortOsSetActive out of memory!\n"));
+}
+
+
+int vboxNetFltOsDisconnectIt(PVBOXNETFLTINS pThis)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltOsDisconnectIt pThis=%p\n", pThis));
+
+    vboxNetFltSolarisDetachFromInterface(pThis);
+
+    return VINF_SUCCESS;
+}
+
+
+int  vboxNetFltOsConnectIt(PVBOXNETFLTINS pThis)
+{
+    /* Nothing to do here. */
+    return VINF_SUCCESS;
+}
+
+
+void vboxNetFltOsDeleteInstance(PVBOXNETFLTINS pThis)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltOsDeleteInstance pThis=%p\n", pThis));
+
+    mutex_destroy(&pThis->u.s.hMtx);
+
+#ifdef VBOXNETFLT_SOLARIS_IPV6_POLLING
+    if (pThis->u.s.hPollMtx != NIL_RTSEMFASTMUTEX)
+    {
+        RTSemFastMutexDestroy(pThis->u.s.hPollMtx);
+        pThis->u.s.hPollMtx = NIL_RTSEMFASTMUTEX;
+    }
+#endif
+
+}
+
+
+int vboxNetFltOsInitInstance(PVBOXNETFLTINS pThis, void *pvContext)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltOsInitInstance pThis=%p\n"));
+
+    /*
+     * Mutex used for loopback lockouts.
+     */
+    int rc = VINF_SUCCESS;
+    mutex_init(&pThis->u.s.hMtx, NULL /* name */, MUTEX_DRIVER, NULL /* cookie */);
+#ifdef VBOXNETFLT_SOLARIS_IPV6_POLLING
+    rc = RTSemFastMutexCreate(&pThis->u.s.hPollMtx);
+    if (RT_SUCCESS(rc))
+    {
+#endif
+        rc = vboxNetFltSolarisAttachToInterface(pThis);
+        if (RT_SUCCESS(rc))
+            return rc;
+
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisAttachToInterface failed. rc=%Rrc\n", rc));
+
+#ifdef VBOXNETFLT_SOLARIS_IPV6_POLLING
+        RTSemFastMutexDestroy(pThis->u.s.hPollMtx);
+        pThis->u.s.hPollMtx = NIL_RTSEMFASTMUTEX;
+    }
+    else
+        LogRel((DEVICE_NAME ":vboxNetFltOsInitInstance failed to create poll mutex. rc=%Rrc\n", rc));
+#endif
+
+    mutex_destroy(&pThis->u.s.hMtx);
+
+    NOREF(pvContext);
+    return rc;
+}
+
+
+int vboxNetFltOsPreInitInstance(PVBOXNETFLTINS pThis)
+{
+    /*
+     * Init. the solaris specific data.
+     */
+    pThis->u.s.hIface = NULL;
+    pThis->u.s.pIp4Stream = NULL;
+    pThis->u.s.pIp6Stream = NULL;
+    pThis->u.s.pArpStream = NULL;
+    pThis->u.s.pPromiscStream = NULL;
+    pThis->u.s.fAttaching = false;
+    pThis->u.s.fVLAN = false;
+#ifdef VBOXNETFLT_SOLARIS_IPV6_POLLING
+    pThis->u.s.hPollMtx = NIL_RTSEMFASTMUTEX;
+#endif
+    bzero(&pThis->u.s.MacAddr, sizeof(pThis->u.s.MacAddr));
+    return VINF_SUCCESS;
+}
+
+
+bool vboxNetFltOsMaybeRediscovered(PVBOXNETFLTINS pThis)
+{
+    /*
+     * We don't support interface rediscovery on Solaris hosts because the
+     * filter is very tightly bound to the stream.
+     */
+    return false;
+}
+
+
+void vboxNetFltPortOsNotifyMacAddress(PVBOXNETFLTINS pThis, void *pvIfData, PCRTMAC pMac)
+{
+    NOREF(pThis); NOREF(pvIfData); NOREF(pMac);
+}
+
+
+int vboxNetFltPortOsConnectInterface(PVBOXNETFLTINS pThis, void *pvIf, void **ppvIfData)
+{
+    /* Nothing to do */
+    NOREF(pThis); NOREF(pvIf); NOREF(ppvIfData);
+    return VINF_SUCCESS;
+}
+
+
+int vboxNetFltPortOsDisconnectInterface(PVBOXNETFLTINS pThis, void *pvIfData)
+{
+    /* Nothing to do */
+    NOREF(pThis); NOREF(pvIfData);
+    return VINF_SUCCESS;
+}
+
+
+int vboxNetFltPortOsXmit(PVBOXNETFLTINS pThis, void *pvIfData, PINTNETSG pSG, uint32_t fDst)
+{
+    NOREF(pvIfData);
+    LogFunc((DEVICE_NAME ":vboxNetFltPortOsXmit pThis=%p pSG=%p fDst=%d\n", pThis, pSG, fDst));
+
+    int rc = VINF_SUCCESS;
+    if (fDst & INTNETTRUNKDIR_WIRE)
+    {
+        vboxnetflt_promisc_stream_t *pPromiscStream = ASMAtomicUoReadPtrT(&pThis->u.s.pPromiscStream,
+                                                                          vboxnetflt_promisc_stream_t *);
+        if (RT_LIKELY(pPromiscStream))
+        {
+            mblk_t *pMsg = vboxNetFltSolarisMBlkFromSG(pThis, pSG, fDst);
+            if (RT_LIKELY(pMsg))
+            {
+                Log((DEVICE_NAME ":vboxNetFltPortOsXmit INTNETTRUNKDIR_WIRE\n"));
+
+                vboxNetFltSolarisQueueLoopback(pThis, pPromiscStream, pMsg);
+                putnext(WR(pPromiscStream->Stream.pReadQueue), pMsg);
+            }
+            else
+            {
+                LogRel((DEVICE_NAME ":vboxNetFltPortOsXmit vboxNetFltSolarisMBlkFromSG failed.\n"));
+                return VERR_NO_MEMORY;
+            }
+        }
+    }
+
+    if (fDst & INTNETTRUNKDIR_HOST)
+    {
+        /*
+         * For unplumbed interfaces we would not be bound to IP or ARP.
+         * We either bind to both or neither; so atomic reading one should be sufficient.
+         */
+        vboxnetflt_stream_t *pIp4Stream = ASMAtomicUoReadPtrT(&pThis->u.s.pIp4Stream, vboxnetflt_stream_t *);
+        if (!pIp4Stream)
+            return rc;
+
+        /*
+         * Create a message block and send it up the host stack (upstream).
+         */
+        mblk_t *pMsg = vboxNetFltSolarisMBlkFromSG(pThis, pSG, fDst);
+        if (RT_LIKELY(pMsg))
+        {
+            PCRTNETETHERHDR pEthHdr = (PCRTNETETHERHDR)pMsg->b_rptr;
+
+            /*
+             * Send message up ARP stream.
+             */
+            if (pEthHdr->EtherType == RT_H2BE_U16(RTNET_ETHERTYPE_ARP))
+            {
+                Log((DEVICE_NAME ":vboxNetFltPortOsXmit INTNETTRUNKDIR_HOST ARP\n"));
+
+                vboxnetflt_stream_t *pArpStream = ASMAtomicUoReadPtrT(&pThis->u.s.pArpStream, vboxnetflt_stream_t *);
+                if (pArpStream)
+                {
+                    /*
+                     * Construct a DL_UNITDATA_IND style message for ARP as it doesn't understand fast path.
+                     */
+                    mblk_t *pDlpiMsg;
+                    rc = vboxNetFltSolarisRawToUnitData(pMsg, &pDlpiMsg);
+                    if (RT_SUCCESS(rc))
+                    {
+                        pMsg = pDlpiMsg;
+
+                        queue_t *pArpReadQueue = pArpStream->pReadQueue;
+                        putnext(pArpReadQueue, pMsg);
+                    }
+                    else
+                    {
+                        LogRel((DEVICE_NAME ":vboxNetFltSolarisRawToUnitData failed!\n"));
+                        freemsg(pMsg);
+                        rc = VERR_NO_MEMORY;
+                    }
+                }
+                else
+                    freemsg(pMsg);  /* Should really never happen... */
+            }
+            else
+            {
+                 vboxnetflt_stream_t *pIp6Stream = ASMAtomicUoReadPtrT(&pThis->u.s.pIp6Stream, vboxnetflt_stream_t *);
+                 if (   pEthHdr->EtherType == RT_H2BE_U16(RTNET_ETHERTYPE_IPV6)
+                     && pIp6Stream)
+                 {
+                     /*
+                      * Send messages up IPv6 stream.
+                      */
+                     Log((DEVICE_NAME ":vboxNetFltPortOsXmit INTNETTRUNKDIR_HOST IPv6\n"));
+
+                     pMsg->b_rptr += sizeof(RTNETETHERHDR);
+                     queue_t *pIp6ReadQueue = pIp6Stream->pReadQueue;
+                     putnext(pIp6ReadQueue, pMsg);
+                 }
+                 else
+                 {
+                    /*
+                     * Send messages up IPv4 stream.
+                     */
+                    Log((DEVICE_NAME ":vboxNetFltPortOsXmit INTNETTRUNKDIR_HOST IPv4\n"));
+
+                    pMsg->b_rptr += sizeof(RTNETETHERHDR);
+                    queue_t *pIp4ReadQueue = pIp4Stream->pReadQueue;
+                    putnext(pIp4ReadQueue, pMsg);
+                }
+            }
+        }
+        else
+        {
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisMBlkFromSG failed.\n"));
+            rc = VERR_NO_MEMORY;
+        }
+    }
+
+    return rc;
+}
+
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/solaris/VBoxNetFltBow-solaris.c b/src/VBox/HostDrivers/VBoxNetFlt/solaris/VBoxNetFltBow-solaris.c
new file mode 100644
index 00000000..9ef84540
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/solaris/VBoxNetFltBow-solaris.c
@@ -0,0 +1,1692 @@
+/* $Id: VBoxNetFltBow-solaris.c $ */
+/** @file
+ * VBoxNetFlt - Network Filter Driver (Host), Solaris Specific Code.
+ */
+
+/*
+ * Copyright (C) 2008-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP LOG_GROUP_NET_FLT_DRV
+#include <VBox/log.h>
+#include <VBox/err.h>
+#include <VBox/intnetinline.h>
+#include <VBox/version.h>
+#include <iprt/initterm.h>
+#include <iprt/alloca.h>
+#include <iprt/assert.h>
+#include <iprt/err.h>
+#include <iprt/string.h>
+#include <iprt/rand.h>
+#include <iprt/net.h>
+#include <iprt/spinlock.h>
+#include <iprt/mem.h>
+
+#include <sys/types.h>
+#include <sys/modctl.h>
+#include <sys/conf.h>
+#include <sys/stat.h>
+#include <sys/ddi.h>
+#include <sys/gld.h>
+#include <sys/sunddi.h>
+#include <sys/strsubr.h>
+#include <sys/dlpi.h>
+#include <sys/dls_mgmt.h>
+#include <sys/mac.h>
+#include <sys/strsun.h>
+
+#include <sys/vnic_mgmt.h>
+#include <sys/mac_client.h>
+#include <sys/mac_provider.h>
+#include <sys/dls.h>
+#include <sys/dld.h>
+#include <sys/cred.h>
+
+
+#define VBOXNETFLT_OS_SPECFIC 1
+#include "../VBoxNetFltInternal.h"
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+/** The module name. */
+#define DEVICE_NAME                     "vboxbow"
+/** The module descriptions as seen in 'modinfo'. */
+#define DEVICE_DESC_DRV                 "VirtualBox NetBow"
+/** The dynamically created VNIC name (hardcoded in NetIf-solaris.cpp).
+ *  @todo move this define into a common header. */
+#define VBOXBOW_VNIC_NAME               "vboxvnic"
+/** The VirtualBox VNIC template name (hardcoded in NetIf-solaris.cpp).
+ *  @todo move this define into a common header. */
+#define VBOXBOW_VNIC_TEMPLATE_NAME      "vboxvnic_template"
+/** Debugging switch for using symbols in kmdb */
+# define LOCAL                          static
+/** VBOXNETFLTVNIC::u32Magic */
+# define VBOXNETFLTVNIC_MAGIC           0x0ddfaced
+
+/** VLAN tag masking, should probably be in IPRT? */
+#define VLAN_ID(vlan)          (((vlan) >>  0) & 0x0fffu)
+#define VLAN_CFI(vlan)         (((vlan) >> 12) & 0x0001u)
+#define VLAN_PRI(vlan)         (((vlan) >> 13) & 0x0007u)
+#define VLAN_TAG(pri,cfi,vid)  (((pri) << 13) | ((cfi) << 12) | ((vid) << 0))
+
+typedef struct VLANHEADER
+{
+    uint16_t Type;
+    uint16_t Data;
+} VLANHEADER;
+typedef struct VLANHEADER *PVLANHEADER;
+
+/* Private: from sys/vlan.h */
+#ifndef VLAN_ID_NONE
+# define VLAN_ID_NONE           0
+#endif
+
+/* Private: from sys/param.h */
+#ifndef MAXLINKNAMESPECIFIER
+# define MAXLINKNAMESPECIFIER   96 /* MAXLINKNAMELEN + ZONENAME_MAX */
+#endif
+
+/* Private: from sys/mac_client_priv.h, mac client function prototypes. */
+extern uint16_t mac_client_vid(mac_client_handle_t hClient);
+extern void     mac_client_get_resources(mac_client_handle_t hClient, mac_resource_props_t *pResources);
+extern int      mac_client_set_resources(mac_client_handle_t hClient, mac_resource_props_t *pResources);
+
+
+/*********************************************************************************************************************************
+*   Kernel Entry Hooks                                                                                                           *
+*********************************************************************************************************************************/
+LOCAL int VBoxNetFltSolarisAttach(dev_info_t *pDip, ddi_attach_cmd_t enmCmd);
+LOCAL int VBoxNetFltSolarisDetach(dev_info_t *pDip, ddi_detach_cmd_t enmCmd);
+LOCAL int VBoxNetFltSolarisGetInfo(dev_info_t *pDip, ddi_info_cmd_t enmCmd, void *pArg, void **ppvResult);
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/**
+ * cb_ops: for drivers that support char/block entry points
+ */
+static struct cb_ops g_VBoxNetFltSolarisCbOps =
+{
+    nulldev,                    /* c open */
+    nulldev,                    /* c close */
+    nodev,                      /* b strategy */
+    nodev,                      /* b dump */
+    nodev,                      /* b print */
+    nodev,                      /* c read */
+    nodev,                      /* c write*/
+    nodev,                      /* c ioctl*/
+    nodev,                      /* c devmap */
+    nodev,                      /* c mmap */
+    nodev,                      /* c segmap */
+    nochpoll,                   /* c poll */
+    ddi_prop_op,                /* property ops */
+    NULL,                       /* streamtab  */
+    D_NEW | D_MP,               /* compat. flag */
+    CB_REV,                     /* revision */
+    nodev,                      /* c aread */
+    nodev                       /* c awrite */
+};
+
+/**
+ * dev_ops: for driver device operations
+ */
+static struct dev_ops g_VBoxNetFltSolarisDevOps =
+{
+    DEVO_REV,                   /* driver build revision */
+    0,                          /* ref count */
+    VBoxNetFltSolarisGetInfo,
+    nulldev,                    /* identify */
+    nulldev,                    /* probe */
+    VBoxNetFltSolarisAttach,
+    VBoxNetFltSolarisDetach,
+    nodev,                      /* reset */
+    &g_VBoxNetFltSolarisCbOps,
+    NULL,                       /* bus ops */
+    nodev,                      /* power */
+    ddi_quiesce_not_needed
+};
+
+/**
+ * modldrv: export driver specifics to the kernel
+ */
+static struct modldrv g_VBoxNetFltSolarisModule =
+{
+    &mod_driverops,             /* extern from kernel */
+    DEVICE_DESC_DRV " " VBOX_VERSION_STRING "r" RT_XSTR(VBOX_SVN_REV),
+    &g_VBoxNetFltSolarisDevOps
+};
+
+/**
+ * modlinkage: export install/remove/info to the kernel
+ */
+static struct modlinkage g_VBoxNetFltSolarisModLinkage =
+{
+    MODREV_1,
+    {
+        &g_VBoxNetFltSolarisModule,
+        NULL,
+    }
+};
+
+/*
+ * VBOXNETFLTVNICTEMPLATE: VNIC template information.
+ */
+typedef struct VBOXNETFLTVNICTEMPLATE
+{
+    /** The name of link on which the VNIC template is created on. */
+    char                        szLinkName[MAXNAMELEN];
+    /** The VLAN Id (can be VLAN_ID_NONE). */
+    uint16_t                    uVLANId;
+    /** Resources (bandwidth, CPU bindings, flow priority etc.) */
+    mac_resource_props_t        Resources;
+} VBOXNETFLTVNICTEMPLATE;
+typedef struct VBOXNETFLTVNICTEMPLATE *PVBOXNETFLTVNICTEMPLATE;
+
+/**
+ * VBOXNETFLTVNIC: Per-VNIC instance data.
+ */
+typedef struct VBOXNETFLTVNIC
+{
+    /** Magic number (VBOXNETFLTVNIC_MAGIC). */
+    uint32_t                    u32Magic;
+    /** Whether we created the VNIC or not. */
+    bool                        fCreated;
+    /** Pointer to the VNIC template if any. */
+    PVBOXNETFLTVNICTEMPLATE     pVNICTemplate;
+    /** Pointer to the VirtualBox interface instance. */
+    void                       *pvIf;
+    /** The MAC handle. */
+    mac_handle_t                hInterface;
+    /** The VNIC link ID. */
+    datalink_id_t               hLinkId;
+    /** The MAC client handle */
+    mac_client_handle_t         hClient;
+    /** The unicast address handle. */
+    mac_unicast_handle_t        hUnicast;
+    /** The promiscuous handle. */
+    mac_promisc_handle_t        hPromisc;
+    /* The VNIC name. */
+    char                        szName[MAXLINKNAMESPECIFIER];
+    /** Handle to the next VNIC in the list. */
+    list_node_t                 hNode;
+} VBOXNETFLTVNIC;
+typedef struct VBOXNETFLTVNIC *PVBOXNETFLTVNIC;
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+/** Global Device handle we only support one instance. */
+static dev_info_t *g_pVBoxNetFltSolarisDip = NULL;
+/** The (common) global data. */
+static VBOXNETFLTGLOBALS g_VBoxNetFltSolarisGlobals;
+/** Global next-free VNIC Id (never decrements). */
+static volatile uint64_t g_VBoxNetFltSolarisVNICId;
+
+
+/*********************************************************************************************************************************
+*   Internal Functions                                                                                                           *
+*********************************************************************************************************************************/
+LOCAL mblk_t *vboxNetFltSolarisMBlkFromSG(PVBOXNETFLTINS pThis, PINTNETSG pSG, uint32_t fDst);
+LOCAL unsigned vboxNetFltSolarisMBlkCalcSGSegs(PVBOXNETFLTINS pThis, mblk_t *pMsg);
+LOCAL int vboxNetFltSolarisMBlkToSG(PVBOXNETFLTINS pThis, mblk_t *pMsg, PINTNETSG pSG, unsigned cSegs, uint32_t fSrc);
+LOCAL void vboxNetFltSolarisRecv(void *pvData, mac_resource_handle_t hResource, mblk_t *pMsg, boolean_t fLoopback);
+//LOCAL void vboxNetFltSolarisAnalyzeMBlk(mblk_t *pMsg);
+LOCAL int vboxNetFltSolarisReportInfo(PVBOXNETFLTINS pThis, mac_handle_t hInterface, bool fIsVNIC);
+LOCAL int vboxNetFltSolarisInitVNIC(PVBOXNETFLTINS pThis, PVBOXNETFLTVNIC pVNIC);
+LOCAL int vboxNetFltSolarisInitVNICTemplate(PVBOXNETFLTINS pThis, PVBOXNETFLTVNICTEMPLATE pVNICTemplate);
+LOCAL PVBOXNETFLTVNIC vboxNetFltSolarisAllocVNIC(void);
+LOCAL void vboxNetFltSolarisFreeVNIC(PVBOXNETFLTVNIC pVNIC);
+LOCAL void vboxNetFltSolarisDestroyVNIC(PVBOXNETFLTVNIC pVNIC);
+LOCAL int vboxNetFltSolarisCreateVNIC(PVBOXNETFLTINS pThis, PVBOXNETFLTVNIC *ppVNIC);
+DECLINLINE(int) vboxNetFltSolarisGetLinkId(const char *pszMacName, datalink_id_t *pLinkId);
+
+/**
+ * Kernel entry points
+ */
+int _init(void)
+{
+    Log((DEVICE_NAME ":_init\n"));
+
+    /*
+     * Prevent module autounloading.
+     */
+    modctl_t *pModCtl = mod_getctl(&g_VBoxNetFltSolarisModLinkage);
+    if (pModCtl)
+        pModCtl->mod_loadflags |= MOD_NOAUTOUNLOAD;
+    else
+        cmn_err(CE_NOTE, ":failed to disable autounloading!\n");
+
+    /*
+     * Initialize IPRT.
+     */
+    int rc = RTR0Init(0);
+    if (RT_SUCCESS(rc))
+    {
+        /*
+         * Initialize the globals and connect to the support driver.
+         *
+         * This will call back vboxNetFltOsOpenSupDrv (and maybe vboxNetFltOsCloseSupDrv)
+         * for establishing the connect to the support driver.
+         */
+        memset(&g_VBoxNetFltSolarisGlobals, 0, sizeof(g_VBoxNetFltSolarisGlobals));
+        rc = vboxNetFltInitGlobalsAndIdc(&g_VBoxNetFltSolarisGlobals);
+        if (RT_SUCCESS(rc))
+        {
+            rc = mod_install(&g_VBoxNetFltSolarisModLinkage);
+            if (!rc)
+                return rc;
+
+            LogRel((DEVICE_NAME ":mod_install failed. rc=%d\n", rc));
+            vboxNetFltTryDeleteIdcAndGlobals(&g_VBoxNetFltSolarisGlobals);
+        }
+        else
+            LogRel((DEVICE_NAME ":failed to initialize globals.\n"));
+
+        RTR0Term();
+    }
+    else
+        cmn_err(CE_NOTE, "failed to initialize IPRT (rc=%d)\n", rc);
+
+    memset(&g_VBoxNetFltSolarisGlobals, 0, sizeof(g_VBoxNetFltSolarisGlobals));
+    return RTErrConvertToErrno(rc);
+}
+
+
+int _fini(void)
+{
+    int rc;
+    Log((DEVICE_NAME ":_fini\n"));
+
+    /*
+     * Undo the work done during start (in reverse order).
+     */
+    rc = vboxNetFltTryDeleteIdcAndGlobals(&g_VBoxNetFltSolarisGlobals);
+    if (RT_FAILURE(rc))
+    {
+        LogRel((DEVICE_NAME ":_fini - busy! rc=%d\n", rc));
+        return EBUSY;
+    }
+
+    rc = mod_remove(&g_VBoxNetFltSolarisModLinkage);
+    if (!rc)
+        RTR0Term();
+
+    return rc;
+}
+
+
+int _info(struct modinfo *pModInfo)
+{
+    /* _info() can be called before _init() so RTR0Init() might not be called at this point. */
+    int rc = mod_info(&g_VBoxNetFltSolarisModLinkage, pModInfo);
+    return rc;
+}
+
+
+/**
+ * Attach entry point, to attach a device to the system or resume it.
+ *
+ * @param   pDip            The module structure instance.
+ * @param   enmCmd          Operation type (attach/resume).
+ *
+ * @returns corresponding solaris error code.
+ */
+LOCAL int VBoxNetFltSolarisAttach(dev_info_t *pDip, ddi_attach_cmd_t enmCmd)
+{
+    Log((DEVICE_NAME ":VBoxNetFltSolarisAttach pDip=%p enmCmd=%d\n", pDip, enmCmd));
+
+    switch (enmCmd)
+    {
+        case DDI_ATTACH:
+        {
+            g_pVBoxNetFltSolarisDip = pDip;
+            return DDI_SUCCESS;
+        }
+
+        case DDI_RESUME:
+        {
+            /* Nothing to do here... */
+            return DDI_SUCCESS;
+        }
+
+        /* case DDI_PM_RESUME: */
+        default:
+            return DDI_FAILURE;
+    }
+}
+
+
+/**
+ * Detach entry point, to detach a device to the system or suspend it.
+ *
+ * @param   pDip            The module structure instance.
+ * @param   enmCmd          Operation type (detach/suspend).
+ *
+ * @returns corresponding solaris error code.
+ */
+LOCAL int VBoxNetFltSolarisDetach(dev_info_t *pDip, ddi_detach_cmd_t enmCmd)
+{
+    Log((DEVICE_NAME ":VBoxNetFltSolarisDetach pDip=%p enmCmd=%d\n", pDip, enmCmd));
+
+    switch (enmCmd)
+    {
+        case DDI_DETACH:
+        {
+            return DDI_SUCCESS;
+        }
+
+        case DDI_RESUME:
+        {
+            /* Nothing to do here... */
+            return DDI_SUCCESS;
+        }
+
+        /* case DDI_PM_SUSPEND: */
+        /* case DDI_HOT_PLUG_DETACH: */
+        default:
+            return DDI_FAILURE;
+    }
+}
+
+
+/**
+ * Info entry point, called by solaris kernel for obtaining driver info.
+ *
+ * @param   pDip            The module structure instance (do not use).
+ * @param   enmCmd          Information request type.
+ * @param   pvArg           Type specific argument.
+ * @param   ppvResult       Where to store the requested info.
+ *
+ * @returns corresponding solaris error code.
+ */
+LOCAL int VBoxNetFltSolarisGetInfo(dev_info_t *pDip, ddi_info_cmd_t enmCmd, void *pvArg, void **ppvResult)
+{
+    Log((DEVICE_NAME ":VBoxNetFltSolarisGetInfo pDip=%p enmCmd=%d pArg=%p instance=%d\n", pDip, enmCmd, getminor((dev_t)pvArg)));
+
+    switch (enmCmd)
+    {
+        case DDI_INFO_DEVT2DEVINFO:
+        {
+            *ppvResult = g_pVBoxNetFltSolarisDip;
+            return DDI_SUCCESS;
+        }
+
+        case DDI_INFO_DEVT2INSTANCE:
+        {
+            int instance = getminor((dev_t)pvArg);
+            *ppvResult = (void *)(uintptr_t)instance;
+            return DDI_SUCCESS;
+        }
+    }
+
+    return DDI_FAILURE;
+}
+
+
+/**
+ * Create a solaris message block from the SG list.
+ *
+ * @param   pThis           The instance.
+ * @param   pSG             Pointer to the scatter-gather list.
+ * @param   fDst            INTNETTRUNKDIR_XXX.
+ *
+ * @returns Solaris message block.
+ */
+DECLINLINE(mblk_t *) vboxNetFltSolarisMBlkFromSG(PVBOXNETFLTINS pThis, PINTNETSG pSG, uint32_t fDst)
+{
+    Log((DEVICE_NAME ":vboxNetFltSolarisMBlkFromSG pThis=%p pSG=%p\n", pThis, pSG));
+
+    mblk_t *pMsg = allocb(pSG->cbTotal, BPRI_HI);
+    if (RT_UNLIKELY(!pMsg))
+    {
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisMBlkFromSG failed to alloc %d bytes for mblk_t.\n", pSG->cbTotal));
+        return NULL;
+    }
+
+    /*
+     * Single buffer copy. Maybe later explore the
+     * need/possibility for using a mblk_t chain rather.
+     */
+    for (unsigned i = 0; i < pSG->cSegsUsed; i++)
+    {
+        if (pSG->aSegs[i].pv)
+        {
+            bcopy(pSG->aSegs[i].pv, pMsg->b_wptr, pSG->aSegs[i].cb);
+            pMsg->b_wptr += pSG->aSegs[i].cb;
+        }
+    }
+    return pMsg;
+}
+
+
+/**
+ * Calculate the number of segments required for this message block.
+ *
+ * @param   pThis   The instance
+ * @param   pMsg    Pointer to the data message.
+ *
+ * @returns Number of segments.
+ */
+LOCAL unsigned vboxNetFltSolarisMBlkCalcSGSegs(PVBOXNETFLTINS pThis, mblk_t *pMsg)
+{
+    unsigned cSegs = 0;
+    for (mblk_t *pCur = pMsg; pCur; pCur = pCur->b_cont)
+        if (MBLKL(pCur))
+            cSegs++;
+
+#ifdef PADD_RUNT_FRAMES_FROM_HOST
+    if (msgdsize(pMsg) < 60)
+        cSegs++;
+#endif
+
+    NOREF(pThis);
+    return RT_MAX(cSegs, 1);
+}
+
+
+/**
+ * Initializes an SG list from the given message block.
+ *
+ * @param   pThis   The instance.
+ * @param   pMsg    Pointer to the data message.
+                    The caller must ensure it's not a control message block.
+ * @param   pSG     Pointer to the SG.
+ * @param   cSegs   Number of segments in the SG.
+ *                  This should match the number in the message block exactly!
+ * @param   fSrc    The source of the message.
+ *
+ * @returns VBox status code.
+ */
+LOCAL int vboxNetFltSolarisMBlkToSG(PVBOXNETFLTINS pThis, mblk_t *pMsg, PINTNETSG pSG, unsigned cSegs, uint32_t fSrc)
+{
+    Log((DEVICE_NAME ":vboxNetFltSolarisMBlkToSG pThis=%p pMsg=%p pSG=%p cSegs=%d\n", pThis, pMsg, pSG, cSegs));
+
+    /*
+     * Convert the message block to segments. Works cbTotal and sets cSegsUsed.
+     */
+    IntNetSgInitTempSegs(pSG, 0 /*cbTotal*/, cSegs, 0 /*cSegsUsed*/);
+    mblk_t *pCur = pMsg;
+    unsigned iSeg = 0;
+    while (pCur)
+    {
+        size_t cbSeg = MBLKL(pCur);
+        if (cbSeg)
+        {
+            void *pvSeg = pCur->b_rptr;
+            pSG->aSegs[iSeg].pv = pvSeg;
+            pSG->aSegs[iSeg].cb = cbSeg;
+            pSG->aSegs[iSeg].Phys = NIL_RTHCPHYS;
+            pSG->cbTotal += cbSeg;
+            iSeg++;
+        }
+        pCur = pCur->b_cont;
+    }
+    pSG->cSegsUsed = iSeg;
+
+#ifdef PADD_RUNT_FRAMES_FROM_HOST
+    if (pSG->cbTotal < 60 && (fSrc & INTNETTRUNKDIR_HOST))
+    {
+        Log((DEVICE_NAME ":vboxNetFltSolarisMBlkToSG pulling up to length.\n"));
+
+        static uint8_t const s_abZero[128] = {0};
+        pSG->aSegs[iSeg].Phys = NIL_RTHCPHYS;
+        pSG->aSegs[iSeg].pv = (void *)&s_abZero[0];
+        pSG->aSegs[iSeg].cb = 60 - pSG->cbTotal;
+        pSG->cbTotal = 60;
+        pSG->cSegsUsed++;
+        Assert(iSeg + 1 < cSegs);
+    }
+#endif
+
+    Log((DEVICE_NAME ":vboxNetFltSolarisMBlkToSG iSeg=%d pSG->cbTotal=%d msgdsize=%d\n", iSeg, pSG->cbTotal, msgdsize(pMsg)));
+    return VINF_SUCCESS;
+}
+
+
+#if 0
+/**
+ * Simple packet dump, used for internal debugging.
+ *
+ * @param   pMsg    Pointer to the message to analyze and dump.
+ */
+LOCAL void vboxNetFltSolarisAnalyzeMBlk(mblk_t *pMsg)
+{
+    LogFunc((DEVICE_NAME ":vboxNetFltSolarisAnalyzeMBlk pMsg=%p\n", pMsg));
+
+    PCRTNETETHERHDR pEthHdr = (PCRTNETETHERHDR)pMsg->b_rptr;
+    uint8_t *pb = pMsg->b_rptr;
+    if (pEthHdr->EtherType == RT_H2BE_U16(RTNET_ETHERTYPE_IPV4))
+    {
+        PRTNETIPV4 pIpHdr = (PRTNETIPV4)(pEthHdr + 1);
+        if (!pMsg->b_cont)
+        {
+            if (pIpHdr->ip_p == RTNETIPV4_PROT_ICMP)
+                LogRel((DEVICE_NAME ":ICMP D=%.6Rhxs  S=%.6Rhxs  T=%04x\n", pb, pb + 6, RT_BE2H_U16(*(uint16_t *)(pb + 12))));
+            else if (pIpHdr->ip_p == RTNETIPV4_PROT_TCP)
+                LogRel((DEVICE_NAME ":TCP D=%.6Rhxs  S=%.6Rhxs\n", pb, pb + 6));
+            else if (pIpHdr->ip_p == RTNETIPV4_PROT_UDP)
+            {
+                PCRTNETUDP pUdpHdr = (PCRTNETUDP)((uint32_t *)pIpHdr + pIpHdr->ip_hl);
+                if (   RT_BE2H_U16(pUdpHdr->uh_sport) == 67
+                    && RT_BE2H_U16(pUdpHdr->uh_dport) == 68)
+                {
+                    LogRel((DEVICE_NAME ":UDP bootp ack D=%.6Rhxs S=%.6Rhxs UDP_CheckSum=%04x Computex=%04x\n", pb, pb + 6,
+                                RT_BE2H_U16(pUdpHdr->uh_sum), RT_BE2H_U16(RTNetIPv4UDPChecksum(pIpHdr, pUdpHdr, pUdpHdr + 1))));
+                }
+            }
+        }
+        else
+        {
+            Log((DEVICE_NAME ":Chained IP packet. Skipping validity check.\n"));
+        }
+    }
+    else if (pEthHdr->EtherType == RT_H2BE_U16(RTNET_ETHERTYPE_VLAN))
+    {
+        PVLANHEADER pVlanHdr = (PVLANHEADER)(pMsg->b_rptr + sizeof(RTNETETHERHDR) - sizeof(pEthHdr->EtherType));
+        LogRel((DEVICE_NAME ":VLAN Pcp=%u Cfi=%u Id=%u\n", VLAN_PRI(RT_BE2H_U16(pVlanHdr->Data)),
+                VLAN_CFI(RT_BE2H_U16(pVlanHdr->Data)), VLAN_ID(RT_BE2H_U16(pVlanHdr->Data))));
+        LogRel((DEVICE_NAME "%.*Rhxd\n", sizeof(VLANHEADER), pVlanHdr));
+    }
+    else if (pEthHdr->EtherType == RT_H2BE_U16(RTNET_ETHERTYPE_ARP))
+    {
+        PRTNETARPHDR pArpHdr = (PRTNETARPHDR)(pEthHdr + 1);
+        LogRel((DEVICE_NAME ":ARP Op=%d\n", pArpHdr->ar_oper));
+    }
+    else if (pEthHdr->EtherType == RT_H2BE_U16(RTNET_ETHERTYPE_IPV6))
+    {
+        LogRel((DEVICE_NAME ":IPv6 D=%.6Rhxs S=%.6Rhxs\n", pb, pb + 6));
+    }
+    else if (   pEthHdr->EtherType == RT_H2BE_U16(RTNET_ETHERTYPE_IPX_1)
+             || pEthHdr->EtherType == RT_H2BE_U16(RTNET_ETHERTYPE_IPX_2)
+             || pEthHdr->EtherType == RT_H2BE_U16(RTNET_ETHERTYPE_IPX_3))
+    {
+        LogRel((DEVICE_NAME ":IPX packet.\n"));
+    }
+    else
+    {
+        LogRel((DEVICE_NAME ":Unknown EtherType=%x D=%.6Rhxs S=%.6Rhxs\n", RT_H2BE_U16(pEthHdr->EtherType), &pEthHdr->DstMac,
+                    &pEthHdr->SrcMac));
+        /* Log((DEVICE_NAME ":%.*Rhxd\n", MBLKL(pMsg), pMsg->b_rptr)); */
+    }
+}
+#endif
+
+
+/**
+ * Helper.
+ */
+DECLINLINE(bool) vboxNetFltPortSolarisIsHostMac(PVBOXNETFLTINS pThis, PCRTMAC pMac)
+{
+    return pThis->u.s.MacAddr.au16[0] == pMac->au16[0]
+        && pThis->u.s.MacAddr.au16[1] == pMac->au16[1]
+        && pThis->u.s.MacAddr.au16[2] == pMac->au16[2];
+}
+
+
+/**
+ * Receive (rx) entry point.
+ *
+ * @param   pvData          Private data.
+ * @param   hResource       The resource handle.
+ * @param   pMsg            The packet.
+ * @param   fLoopback       Whether this is a loopback packet or not.
+ */
+LOCAL void vboxNetFltSolarisRecv(void *pvData, mac_resource_handle_t hResource, mblk_t *pMsg, boolean_t fLoopback)
+{
+    Log((DEVICE_NAME ":vboxNetFltSolarisRecv pvData=%p pMsg=%p fLoopback=%d cbData=%d\n", pvData, pMsg, fLoopback,
+         pMsg ? MBLKL(pMsg) : 0));
+
+    PVBOXNETFLTINS pThis = (PVBOXNETFLTINS)pvData;
+    AssertPtrReturnVoid(pThis);
+    AssertPtrReturnVoid(pMsg);
+
+    /*
+     * Active? Retain the instance and increment the busy counter.
+     */
+    if (!vboxNetFltTryRetainBusyActive(pThis))
+    {
+        freemsgchain(pMsg);
+        return;
+    }
+
+    uint32_t fSrc = INTNETTRUNKDIR_WIRE;
+    PRTNETETHERHDR pEthHdr = (PRTNETETHERHDR)pMsg->b_rptr;
+    if (   MBLKL(pMsg) >= sizeof(RTNETETHERHDR)
+        && vboxNetFltPortSolarisIsHostMac(pThis, &pEthHdr->SrcMac))
+        fSrc = INTNETTRUNKDIR_HOST;
+
+    /*
+     * Route all received packets into the internal network.
+     */
+    uint16_t cFailed = 0;
+    for (mblk_t *pCurMsg = pMsg; pCurMsg != NULL; pCurMsg = pCurMsg->b_next)
+    {
+        unsigned cSegs = vboxNetFltSolarisMBlkCalcSGSegs(pThis, pCurMsg);
+        PINTNETSG pSG = (PINTNETSG)alloca(RT_UOFFSETOF_DYN(INTNETSG, aSegs[cSegs]));
+        int rc = vboxNetFltSolarisMBlkToSG(pThis, pMsg, pSG, cSegs, fSrc);
+        if (RT_SUCCESS(rc))
+            pThis->pSwitchPort->pfnRecv(pThis->pSwitchPort, NULL, pSG, fSrc);
+        else
+            cFailed++;
+    }
+    vboxNetFltRelease(pThis, true /* fBusy */);
+
+    if (RT_UNLIKELY(cFailed))
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisMBlkToSG failed for %u packets.\n", cFailed));
+
+    freemsgchain(pMsg);
+
+    NOREF(hResource);
+}
+
+
+#if 0
+/**
+ * MAC layer link notification hook.
+ *
+ * @param    pvArg          Opaque pointer to the instance.
+ * @param    Type           Notification Type.
+ *
+ * @remarks This hook will be invoked for various changes to the underlying
+ *          interface even when VMs aren't running so don't do any funky stuff
+ *          here.
+ */
+LOCAL void vboxNetFltSolarisLinkNotify(void *pvArg, mac_notify_type_t Type)
+{
+    LogRel((DEVICE_NAME ":vboxNetFltSolarisLinkNotify pvArg=%p Type=%d\n", pvArg, Type));
+
+    PVBOXNETFLTINS pThis = pvArg;
+    AssertReturnVoid(VALID_PTR(pThis));
+    AssertReturnVoid(pThis->u.s.hInterface);
+
+    switch (Type)
+    {
+        case MAC_NOTE_LINK:
+        {
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisLinkNotify link state change\n"));
+            link_state_t hLinkState = mac_stat_get(pThis->u.s.hInterface, MAC_STAT_LINK_STATE);
+            bool fDisconnectedFromHost = hLinkState == LINK_STATE_UP ? false : true;
+            if (fDisconnectedFromHost != ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost))
+            {
+                ASMAtomicUoWriteBool(&pThis->fDisconnectedFromHost, fDisconnectedFromHost);
+                LogRel((DEVICE_NAME ":vboxNetFltSolarisLinkNotify link state change: new state=%s\n",
+                fDisconnectedFromHost ? "DOWN" : "UP"));
+            }
+            break;
+        }
+
+        default:
+            return;
+    }
+}
+#endif
+
+
+/**
+ * Report capabilities and MAC address to IntNet after obtaining the MAC address
+ * of the underlying interface for a VNIC or the current interface if it's a
+ * physical/ether-stub interface.
+ *
+ * @param   pThis           The instance.
+ * @param   hInterface      The Interface handle.
+ * @param   fIsVNIC         Whether this interface handle corresponds to a VNIC
+ *                          or not.
+ *
+ * @remarks Retains the instance while doing it's job.
+ * @returns VBox status code.
+ */
+LOCAL int vboxNetFltSolarisReportInfo(PVBOXNETFLTINS pThis, mac_handle_t hInterface, bool fIsVNIC)
+{
+    mac_handle_t hLowerMac = NULL;
+    if (!fIsVNIC)
+        hLowerMac = hInterface;
+    else
+    {
+        hLowerMac = mac_get_lower_mac_handle(hInterface);
+        if (RT_UNLIKELY(!hLowerMac))
+        {
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisReportInfo failed to get lower MAC handle for '%s'\n", pThis->szName));
+            return VERR_INVALID_HANDLE;
+        }
+    }
+
+    pThis->u.s.hInterface = hLowerMac;
+
+#if 0
+    /*
+     * Try setup link notification hooks, this might fail if mac_no_notification()
+     * doesn't support it. We won't bother using the private function since link notification
+     * isn't critical for us and ignore failures.
+     */
+    pThis->u.s.hNotify = mac_notify_add(hLowerMac, vboxNetFltSolarisLinkNotify, pThis);
+    if (!pThis->u.s.hNotify)
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisReportInfo Warning! Failed to setup link notification hook.\n"));
+#endif
+
+    mac_unicast_primary_get(hLowerMac, (uint8_t *)pThis->u.s.MacAddr.au8);
+    if (vboxNetFltTryRetainBusyNotDisconnected(pThis))
+    {
+        Assert(pThis->pSwitchPort);
+        Log((DEVICE_NAME ":vboxNetFltSolarisReportInfo phys mac %.6Rhxs\n", &pThis->u.s.MacAddr));
+        pThis->pSwitchPort->pfnReportMacAddress(pThis->pSwitchPort, &pThis->u.s.MacAddr);
+        pThis->pSwitchPort->pfnReportPromiscuousMode(pThis->pSwitchPort, false); /** @todo Promisc */
+        pThis->pSwitchPort->pfnReportGsoCapabilities(pThis->pSwitchPort, 0, INTNETTRUNKDIR_WIRE | INTNETTRUNKDIR_HOST);
+        pThis->pSwitchPort->pfnReportNoPreemptDsts(pThis->pSwitchPort, 0 /* none */);
+        vboxNetFltRelease(pThis, true /*fBusy*/);
+        return VINF_SUCCESS;
+    }
+    else
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisReportInfo failed to retain interface. pThis=%p\n", pThis));
+
+    return VERR_INTNET_FLT_IF_BUSY;
+}
+
+
+/**
+ * Initialize a VNIC, optionally from a template.
+ *
+ * @param   pThis           The instance.
+ * @param   pVNIC           Pointer to the VNIC.
+ *
+ * @returns VBox status code.
+ */
+LOCAL int vboxNetFltSolarisInitVNIC(PVBOXNETFLTINS pThis, PVBOXNETFLTVNIC pVNIC)
+{
+    /*
+     * Some paranoia.
+     */
+    AssertReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertReturn(pVNIC, VERR_INVALID_PARAMETER);
+    AssertReturn(pVNIC->hInterface, VERR_INVALID_POINTER);
+    AssertReturn(pVNIC->hLinkId != DATALINK_INVALID_LINKID, VERR_INVALID_HANDLE);
+    AssertReturn(!pVNIC->hClient, VERR_INVALID_POINTER);
+
+    int rc = mac_client_open(pVNIC->hInterface, &pVNIC->hClient,
+                         NULL,                                   /* name of this client */
+                         MAC_OPEN_FLAGS_USE_DATALINK_NAME |      /* client name same as underlying NIC */
+                         MAC_OPEN_FLAGS_MULTI_PRIMARY            /* allow multiple primary unicasts */
+                         );
+    if (RT_LIKELY(!rc))
+    {
+        if (pVNIC->pVNICTemplate)
+            rc = mac_client_set_resources(pVNIC->hClient, &pVNIC->pVNICTemplate->Resources);
+
+        if (RT_LIKELY(!rc))
+        {
+            Log((DEVICE_NAME ":vboxNetFltSolarisInitVNIC succesfully initialized VNIC.\n"));
+            return VINF_SUCCESS;
+        }
+        else
+        {
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisInitVNIC mac_client_set_resources failed. rc=%d\n", rc));
+            rc = VERR_INTNET_FLT_VNIC_INIT_FAILED;
+        }
+
+        mac_client_close(pVNIC->hClient, 0 /* flags */);
+        pVNIC->hClient = NULL;
+    }
+    else
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisInitVNIC failed to open mac client for '%s' rc=%d\n", pThis->szName, rc));
+
+    return VERR_INTNET_FLT_VNIC_OPEN_FAILED;
+}
+
+
+
+/**
+ * Get the underlying link name for a VNIC (template).
+ *
+ * @return VBox status code.
+ * @param   hVNICMacHandle      The handle to the VNIC.
+ * @param   pszLowerLinkName    Where to store the lower-mac linkname, must be
+ *                              at least MAXLINKNAMELEN in size.
+ */
+LOCAL int vboxNetFltSolarisGetLowerLinkName(mac_handle_t hVNICMacHandle, char *pszLowerLinkName)
+{
+    Assert(mac_is_vnic(hVNICMacHandle));
+    mac_handle_t hPhysLinkHandle = mac_get_lower_mac_handle(hVNICMacHandle);
+    if (RT_LIKELY(hPhysLinkHandle))
+    {
+        datalink_id_t PhysLinkId;
+        const char *pszMacName = mac_name(hPhysLinkHandle);
+        int rc = vboxNetFltSolarisGetLinkId(pszMacName, &PhysLinkId);
+        if (RT_SUCCESS(rc))
+        {
+            rc = dls_mgmt_get_linkinfo(PhysLinkId, pszLowerLinkName, NULL /*class*/, NULL /*media*/, NULL /*flags*/);
+            if (RT_LIKELY(!rc))
+                return VINF_SUCCESS;
+
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisGetLowerLinkName failed to get link info. pszMacName=%s pszLowerLinkName=%s\n",
+                    pszMacName, pszLowerLinkName));
+            return VERR_INTNET_FLT_LOWER_LINK_INFO_NOT_FOUND;
+        }
+
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisGetLowerLinkName failed to get link id. pszMacName=%s pszLowerLinkName=%s\n",
+                pszMacName, pszLowerLinkName));
+        return VERR_INTNET_FLT_LOWER_LINK_ID_NOT_FOUND;
+    }
+
+    LogRel((DEVICE_NAME ":vboxNetFltSolarisGetLowerLinkName failed to get lower-mac. pszLowerLinkName=%s\n", pszLowerLinkName));
+    return VERR_INTNET_FLT_LOWER_LINK_OPEN_FAILED;
+}
+
+
+/**
+ * Initializes the VNIC template. This involves opening the template VNIC to
+ * retreive info. like the VLAN Id, underlying MAC address etc.
+ *
+ * @param   pThis           The VM connection instance.
+ * @param   pVNICTemplate   Pointer to a VNIC template to initialize.
+ *
+ * @returns VBox status code.
+ */
+LOCAL int vboxNetFltSolarisInitVNICTemplate(PVBOXNETFLTINS pThis, PVBOXNETFLTVNICTEMPLATE pVNICTemplate)
+{
+    Log((DEVICE_NAME ":vboxNetFltSolarisInitVNICTemplate pThis=%p pVNICTemplate=%p\n", pThis, pVNICTemplate));
+
+    AssertReturn(pVNICTemplate, VERR_INVALID_PARAMETER);
+    AssertReturn(pThis->u.s.fIsVNICTemplate == true, VERR_INVALID_STATE);
+
+    /*
+     * Get the VNIC template's datalink ID.
+     */
+    datalink_id_t VNICLinkId;
+    int rc = vboxNetFltSolarisGetLinkId(pThis->szName, &VNICLinkId);
+    if (RT_SUCCESS(rc))
+    {
+        /*
+         * Open the VNIC to obtain a MAC handle so as to retreive the VLAN ID.
+         */
+        mac_handle_t hInterface;
+        rc = mac_open_by_linkid(VNICLinkId, &hInterface);
+        if (!rc)
+        {
+            /*
+             * Get the underlying linkname.
+             */
+            AssertCompile(sizeof(pVNICTemplate->szLinkName) >= MAXLINKNAMELEN);
+            rc = vboxNetFltSolarisGetLowerLinkName(hInterface, pVNICTemplate->szLinkName);
+            if (RT_SUCCESS(rc))
+            {
+                /*
+                 * Now open the VNIC template to retrieve the VLAN Id & resources.
+                 */
+                mac_client_handle_t hClient;
+                rc = mac_client_open(hInterface, &hClient,
+                                     NULL,                                   /* name of this client */
+                                     MAC_OPEN_FLAGS_USE_DATALINK_NAME |      /* client name same as underlying NIC */
+                                     MAC_OPEN_FLAGS_MULTI_PRIMARY            /* allow multiple primary unicasts */
+                                     );
+                if (RT_LIKELY(!rc))
+                {
+                    pVNICTemplate->uVLANId = mac_client_vid(hClient);
+                    mac_client_get_resources(hClient, &pVNICTemplate->Resources);
+                    mac_client_close(hClient, 0 /* fFlags */);
+                    mac_close(hInterface);
+
+                    LogRel((DEVICE_NAME ":vboxNetFltSolarisInitVNICTemplate successfully init. VNIC template. szLinkName=%s "
+                            "VLAN Id=%u\n", pVNICTemplate->szLinkName, pVNICTemplate->uVLANId));
+                    return VINF_SUCCESS;
+                }
+                else
+                {
+                    LogRel((DEVICE_NAME ":vboxNetFltSolarisInitVNICTemplate failed to open VNIC template. rc=%d\n", rc));
+                    rc = VERR_INTNET_FLT_IF_FAILED;
+                }
+            }
+            else
+                LogRel((DEVICE_NAME ":vboxNetFltSolarisInitVNICTemplate failed to get lower linkname for VNIC template '%s'.\n",
+                        pThis->szName));
+
+            mac_close(hInterface);
+        }
+        else
+        {
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisInitVNICTemplate failed to open by link ID. rc=%d\n", rc));
+            rc = VERR_INTNET_FLT_IF_FAILED;
+        }
+    }
+    else
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisInitVNICTemplate failed to get VNIC template link Id. rc=%d\n", rc));
+
+    return rc;
+}
+
+
+/**
+ * Allocate a VNIC structure.
+ *
+ * @returns An allocated VNIC structure or NULL in case of errors.
+ */
+LOCAL PVBOXNETFLTVNIC vboxNetFltSolarisAllocVNIC(void)
+{
+    PVBOXNETFLTVNIC pVNIC = RTMemAllocZ(sizeof(VBOXNETFLTVNIC));
+    if (RT_UNLIKELY(!pVNIC))
+        return NULL;
+
+    pVNIC->u32Magic        = VBOXNETFLTVNIC_MAGIC;
+    pVNIC->fCreated        = false;
+    pVNIC->pVNICTemplate   = NULL;
+    pVNIC->pvIf            = NULL;
+    pVNIC->hInterface      = NULL;
+    pVNIC->hLinkId         = DATALINK_INVALID_LINKID;
+    pVNIC->hClient         = NULL;
+    pVNIC->hUnicast        = NULL;
+    pVNIC->hPromisc        = NULL;
+    RT_ZERO(pVNIC->szName);
+    list_link_init(&pVNIC->hNode);
+    return pVNIC;
+}
+
+
+/**
+ * Frees an allocated VNIC.
+ *
+ * @param   pVNIC           Pointer to the VNIC.
+ */
+DECLINLINE(void) vboxNetFltSolarisFreeVNIC(PVBOXNETFLTVNIC pVNIC)
+{
+    RTMemFree(pVNIC);
+}
+
+
+/**
+ * Destroy a created VNIC if it was created by us, or just
+ * de-initializes the VNIC freeing up resources handles.
+ *
+ * @param   pVNIC           Pointer to the VNIC.
+ */
+LOCAL void vboxNetFltSolarisDestroyVNIC(PVBOXNETFLTVNIC pVNIC)
+{
+    AssertPtrReturnVoid(pVNIC);
+    AssertMsgReturnVoid(pVNIC->u32Magic == VBOXNETFLTVNIC_MAGIC, ("pVNIC=%p u32Magic=%#x\n", pVNIC, pVNIC->u32Magic));
+    if (pVNIC)
+    {
+        if (pVNIC->hClient)
+        {
+#if 0
+            if (pVNIC->hUnicast)
+            {
+                mac_unicast_remove(pVNIC->hClient, pVNIC->hUnicast);
+                pVNIC->hUnicast = NULL;
+            }
+#endif
+
+            if (pVNIC->hPromisc)
+            {
+                mac_promisc_remove(pVNIC->hPromisc);
+                pVNIC->hPromisc = NULL;
+            }
+
+            mac_rx_clear(pVNIC->hClient);
+
+            mac_client_close(pVNIC->hClient, 0 /* fFlags */);
+            pVNIC->hClient = NULL;
+        }
+
+        if (pVNIC->hInterface)
+        {
+            mac_close(pVNIC->hInterface);
+            pVNIC->hInterface = NULL;
+        }
+
+        if (pVNIC->fCreated)
+        {
+            vnic_delete(pVNIC->hLinkId, 0 /* Flags */);
+            pVNIC->hLinkId = DATALINK_INVALID_LINKID;
+            pVNIC->fCreated = false;
+        }
+
+        if (pVNIC->pVNICTemplate)
+        {
+            RTMemFree(pVNIC->pVNICTemplate);
+            pVNIC->pVNICTemplate = NULL;
+        }
+    }
+}
+
+
+/**
+ * Create a non-persistent VNIC over the given interface.
+ *
+ * @param   pThis           The VM connection instance.
+ * @param   ppVNIC          Where to store the created VNIC.
+ *
+ * @returns VBox status code.
+ */
+LOCAL int vboxNetFltSolarisCreateVNIC(PVBOXNETFLTINS pThis, PVBOXNETFLTVNIC *ppVNIC)
+{
+    Log((DEVICE_NAME ":vboxNetFltSolarisCreateVNIC pThis=%p\n", pThis));
+
+    AssertReturn(pThis, VERR_INVALID_POINTER);
+    AssertReturn(ppVNIC, VERR_INVALID_POINTER);
+
+    int rc = VERR_INVALID_STATE;
+    PVBOXNETFLTVNIC pVNIC = vboxNetFltSolarisAllocVNIC();
+    if (RT_UNLIKELY(!pVNIC))
+        return VERR_NO_MEMORY;
+
+    /*
+     * Set a random MAC address for now. It will be changed to the VM interface's
+     * MAC address later, see vboxNetFltPortOsNotifyMacAddress().
+     */
+    RTMAC GuestMac;
+    GuestMac.au8[0] = 0x08;
+    GuestMac.au8[1] = 0x00;
+    GuestMac.au8[2] = 0x27;
+    RTRandBytes(&GuestMac.au8[3], 3);
+
+    AssertCompile(sizeof(RTMAC) <= MAXMACADDRLEN);
+
+    const char *pszLinkName       = pThis->szName;
+    uint16_t uVLANId              = VLAN_ID_NONE;
+    vnic_mac_addr_type_t AddrType = VNIC_MAC_ADDR_TYPE_FIXED;
+    vnic_ioc_diag_t Diag          = VNIC_IOC_DIAG_NONE;
+    int MacSlot                   = 0;
+    int MacLen                    = sizeof(GuestMac);
+    uint32_t fFlags               = 0;
+
+    if (pThis->u.s.fIsVNICTemplate)
+    {
+        pVNIC->pVNICTemplate = RTMemAllocZ(sizeof(VBOXNETFLTVNICTEMPLATE));
+        if (RT_UNLIKELY(!pVNIC->pVNICTemplate))
+        {
+            vboxNetFltSolarisFreeVNIC(pVNIC);
+            return VERR_NO_MEMORY;
+        }
+
+        /*
+         * Initialize the VNIC template.
+         */
+        rc = vboxNetFltSolarisInitVNICTemplate(pThis, pVNIC->pVNICTemplate);
+        if (RT_FAILURE(rc))
+        {
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisCreateVNIC failed to initialize VNIC from VNIC template. rc=%Rrc\n", rc));
+            vboxNetFltSolarisFreeVNIC(pVNIC);
+            return rc;
+        }
+
+        pszLinkName = pVNIC->pVNICTemplate->szLinkName;
+        uVLANId     = pVNIC->pVNICTemplate->uVLANId;
+#if 0
+        /*
+         * Required only if we're creating a VLAN interface & not a VNIC with a VLAN Id.
+         */
+        if (uVLANId != VLAN_ID_NONE)
+            fFlags |= MAC_VLAN;
+#endif
+        Log((DEVICE_NAME ":vboxNetFltSolarisCreateVNIC pThis=%p VLAN Id=%u\n", pThis, uVLANId));
+    }
+
+    /*
+     * Make sure the dynamic VNIC we're creating doesn't already exists, if so pick a new instance.
+     * This is to avoid conflicts with users manually creating VNICs whose name starts with VBOXBOW_VNIC_NAME.
+     */
+    do
+    {
+        AssertCompile(sizeof(pVNIC->szName) > sizeof(VBOXBOW_VNIC_NAME "18446744073709551615" /* UINT64_MAX */));
+        RTStrPrintf(pVNIC->szName, sizeof(pVNIC->szName), "%s%RU64", VBOXBOW_VNIC_NAME, g_VBoxNetFltSolarisVNICId);
+        mac_handle_t hTmpMacHandle;
+        rc = mac_open_by_linkname(pVNIC->szName, &hTmpMacHandle);
+        if (rc)
+            break;
+        mac_close(hTmpMacHandle);
+        ASMAtomicIncU64(&g_VBoxNetFltSolarisVNICId);
+    } while (1);
+
+    /*
+     * Create the VNIC under 'pszLinkName', which can be the one from the VNIC template or can
+     * be a physical interface.
+     */
+    rc = vnic_create(pVNIC->szName, pszLinkName, &AddrType, &MacLen, GuestMac.au8, &MacSlot, 0 /* Mac-Prefix Length */, uVLANId,
+                        fFlags, &pVNIC->hLinkId, &Diag, NULL /* Reserved */);
+    if (!rc)
+    {
+        pVNIC->fCreated = true;
+        ASMAtomicIncU64(&g_VBoxNetFltSolarisVNICId);
+
+        /*
+         * Now try opening the created VNIC.
+         */
+        rc = mac_open_by_linkid(pVNIC->hLinkId, &pVNIC->hInterface);
+        if (!rc)
+        {
+            /*
+             * Initialize the VNIC from the physical interface or the VNIC template.
+             */
+            rc = vboxNetFltSolarisInitVNIC(pThis, pVNIC);
+            if (RT_SUCCESS(rc))
+            {
+                Log((DEVICE_NAME ":vboxNetFltSolarisCreateVNIC created VNIC '%s' over '%s' with random mac %.6Rhxs\n",
+                     pVNIC->szName, pszLinkName, &GuestMac));
+                *ppVNIC = pVNIC;
+                return VINF_SUCCESS;
+            }
+
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisCreateVNIC vboxNetFltSolarisInitVNIC failed. rc=%d\n", rc));
+            mac_close(pVNIC->hInterface);
+            pVNIC->hInterface = NULL;
+        }
+        else
+        {
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisCreateVNIC logrel failed to open VNIC '%s' over '%s'. rc=%d\n", pVNIC->szName,
+                    pThis->szName, rc));
+            rc = VERR_INTNET_FLT_VNIC_LINK_ID_NOT_FOUND;
+        }
+
+        vboxNetFltSolarisDestroyVNIC(pVNIC);
+    }
+    else
+    {
+        LogRel((DEVICE_NAME ":vboxNetFltSolarisCreateVNIC failed to create VNIC '%s' over '%s' rc=%d Diag=%d\n", pVNIC->szName,
+                    pszLinkName, rc, Diag));
+        rc = VERR_INTNET_FLT_VNIC_CREATE_FAILED;
+    }
+
+    vboxNetFltSolarisFreeVNIC(pVNIC);
+
+    return rc;
+}
+
+
+/**
+ * Wrapper for getting the datalink ID given the MAC name.
+ *
+ * @param    pszMacName     The MAC name.
+ * @param    pLinkId        Where to store the datalink ID.
+ *
+ * @returns VBox status code.
+ */
+DECLINLINE(int) vboxNetFltSolarisGetLinkId(const char *pszMacName, datalink_id_t *pLinkId)
+{
+    /*
+     * dls_mgmt_get_linkid() requires to be in a state to answer upcalls. We should always use this
+     * first before resorting to other means to retrieve the MAC name.
+     */
+    int rc = dls_mgmt_get_linkid(pszMacName, pLinkId);
+    if (rc)
+        rc = dls_devnet_macname2linkid(pszMacName, pLinkId);
+
+    if (RT_LIKELY(!rc))
+        return VINF_SUCCESS;
+
+    LogRel((DEVICE_NAME ":vboxNetFltSolarisGetLinkId failed for '%s'. rc=%d\n", pszMacName, rc));
+    return RTErrConvertFromErrno(rc);
+}
+
+
+/**
+ * Set the promiscuous mode RX hook.
+ *
+ * @param    pThis          The VM connection instance.
+ * @param    pVNIC          Pointer to the VNIC.
+ *
+ * @returns VBox status code.
+ */
+DECLINLINE(int) vboxNetFltSolarisSetPromisc(PVBOXNETFLTINS pThis, PVBOXNETFLTVNIC pVNIC)
+{
+    int rc = VINF_SUCCESS;
+    if (!pVNIC->hPromisc)
+    {
+        rc = mac_promisc_add(pVNIC->hClient, MAC_CLIENT_PROMISC_FILTERED, vboxNetFltSolarisRecv, pThis, &pVNIC->hPromisc,
+                             MAC_PROMISC_FLAGS_NO_TX_LOOP | MAC_PROMISC_FLAGS_VLAN_TAG_STRIP | MAC_PROMISC_FLAGS_NO_PHYS);
+        if (RT_UNLIKELY(rc))
+            LogRel((DEVICE_NAME ":vboxNetFltSolarisSetPromisc failed. rc=%d\n", rc));
+        rc = RTErrConvertFromErrno(rc);
+    }
+    return rc;
+}
+
+
+/**
+ * Clear the promiscuous mode RX hook.
+ *
+ * @param   pThis           The VM connection instance.
+ * @param   pVNIC           Pointer to the VNIC.
+ */
+DECLINLINE(void) vboxNetFltSolarisRemovePromisc(PVBOXNETFLTINS pThis, PVBOXNETFLTVNIC pVNIC)
+{
+    if (pVNIC->hPromisc)
+    {
+        mac_promisc_remove(pVNIC->hPromisc);
+        pVNIC->hPromisc = NULL;
+    }
+}
+
+
+/* -=-=-=-=-=- Common Hooks -=-=-=-=-=- */
+
+
+void vboxNetFltPortOsSetActive(PVBOXNETFLTINS pThis, bool fActive)
+{
+    Log((DEVICE_NAME ":vboxNetFltPortOsSetActive pThis=%p fActive=%d\n", pThis, fActive));
+
+    /*
+     * Reactivate/quiesce the interface.
+     */
+    PVBOXNETFLTVNIC pVNIC = list_head(&pThis->u.s.hVNICs);
+    if (fActive)
+    {
+        for (; pVNIC != NULL; pVNIC = list_next(&pThis->u.s.hVNICs, pVNIC))
+            if (pVNIC->hClient)
+            {
+#if 0
+                mac_rx_set(pVNIC->hClient, vboxNetFltSolarisRecv, pThis);
+#endif
+                vboxNetFltSolarisSetPromisc(pThis, pVNIC);
+            }
+    }
+    else
+    {
+        for (; pVNIC != NULL; pVNIC = list_next(&pThis->u.s.hVNICs, pVNIC))
+            if (pVNIC->hClient)
+            {
+#if 0
+                mac_rx_clear(pVNIC->hClient);
+#endif
+                vboxNetFltSolarisRemovePromisc(pThis, pVNIC);
+            }
+    }
+}
+
+
+int vboxNetFltOsDisconnectIt(PVBOXNETFLTINS pThis)
+{
+    Log((DEVICE_NAME ":vboxNetFltOsDisconnectIt pThis=%p\n", pThis));
+    return VINF_SUCCESS;
+}
+
+
+int  vboxNetFltOsConnectIt(PVBOXNETFLTINS pThis)
+{
+    Log((DEVICE_NAME ":vboxNetFltOsConnectIt pThis=%p\n", pThis));
+    return VINF_SUCCESS;
+}
+
+
+void vboxNetFltOsDeleteInstance(PVBOXNETFLTINS pThis)
+{
+    Log((DEVICE_NAME ":vboxNetFltOsDeleteInstance pThis=%p\n", pThis));
+
+    if (pThis->u.s.hNotify)
+        mac_notify_remove(pThis->u.s.hNotify, B_TRUE /* Wait */);
+
+    /*
+     * Destroy all managed VNICs. If a VNIC was passed to us, there
+     * will be only 1 item in the list, otherwise as many interfaces
+     * that were somehow not destroyed using DisconnectInterface() will be
+     * present.
+     */
+    PVBOXNETFLTVNIC pVNIC = NULL;
+    while ((pVNIC = list_remove_head(&pThis->u.s.hVNICs)) != NULL)
+    {
+        vboxNetFltSolarisDestroyVNIC(pVNIC);
+        vboxNetFltSolarisFreeVNIC(pVNIC);
+    }
+
+    list_destroy(&pThis->u.s.hVNICs);
+}
+
+
+int vboxNetFltOsInitInstance(PVBOXNETFLTINS pThis, void *pvContext)
+{
+    Log((DEVICE_NAME ":vboxNetFltOsInitInstance pThis=%p pvContext=%p\n", pThis, pvContext));
+
+    /*
+     * Figure out if the interface is a VNIC or a physical/etherstub/whatever NIC, then
+     * do the actual VNIC creation if necessary in vboxNetFltPortOsConnectInterface().
+     */
+    mac_handle_t hInterface;
+    int rc = mac_open_by_linkname(pThis->szName, &hInterface);
+    if (RT_LIKELY(!rc))
+    {
+        rc = mac_is_vnic(hInterface);
+        if (!rc)
+        {
+            Log((DEVICE_NAME ":vboxNetFltOsInitInstance pThis=%p physical interface '%s' detected.\n", pThis, pThis->szName));
+            pThis->u.s.fIsVNIC = false;
+        }
+        else
+        {
+            pThis->u.s.fIsVNIC = true;
+            if (RTStrNCmp(pThis->szName, VBOXBOW_VNIC_TEMPLATE_NAME, sizeof(VBOXBOW_VNIC_TEMPLATE_NAME) - 1) == 0)
+            {
+                Log((DEVICE_NAME ":vboxNetFltOsInitInstance pThis=%p VNIC template '%s' detected.\n", pThis, pThis->szName));
+                pThis->u.s.fIsVNICTemplate = true;
+            }
+        }
+
+        if (    pThis->u.s.fIsVNIC
+            && !pThis->u.s.fIsVNICTemplate)
+            Log((DEVICE_NAME ":vboxNetFltOsInitInstance pThis=%p VNIC '%s' detected.\n", pThis, pThis->szName));
+
+        /*
+         * Report info. (host MAC address, promiscuous, GSO capabilities etc.) to IntNet.
+         */
+        rc = vboxNetFltSolarisReportInfo(pThis, hInterface, pThis->u.s.fIsVNIC);
+        if (RT_FAILURE(rc))
+            LogRel((DEVICE_NAME ":vboxNetFltOsInitInstance failed to report info. rc=%d\n", rc));
+
+        mac_close(hInterface);
+    }
+    else
+    {
+        LogRel((DEVICE_NAME ":vboxNetFltOsInitInstance failed to open link '%s'! rc=%d\n", pThis->szName, rc));
+        rc = VERR_INTNET_FLT_IF_FAILED;
+    }
+
+    return rc;
+}
+
+
+int vboxNetFltOsPreInitInstance(PVBOXNETFLTINS pThis)
+{
+    /*
+     * Init. the solaris specific data.
+     */
+    pThis->u.s.fIsVNIC         = false;
+    pThis->u.s.fIsVNICTemplate = false;
+    list_create(&pThis->u.s.hVNICs, sizeof(VBOXNETFLTVNIC), offsetof(VBOXNETFLTVNIC, hNode));
+    pThis->u.s.hNotify         = NULL;
+    RT_ZERO(pThis->u.s.MacAddr);
+    return VINF_SUCCESS;
+}
+
+
+bool vboxNetFltOsMaybeRediscovered(PVBOXNETFLTINS pThis)
+{
+    /*
+     * @todo Think about this.
+     */
+    return false;
+}
+
+
+int vboxNetFltPortOsXmit(PVBOXNETFLTINS pThis, void *pvIfData, PINTNETSG pSG, uint32_t fDst)
+{
+    /*
+     * Validate parameters.
+     */
+    PVBOXNETFLTVNIC pVNIC = pvIfData;
+    AssertReturn(VALID_PTR(pVNIC), VERR_INVALID_POINTER);
+    AssertMsgReturn(pVNIC->u32Magic == VBOXNETFLTVNIC_MAGIC,
+                    ("Invalid magic=%#x (expected %#x)\n", pVNIC->u32Magic, VBOXNETFLTVNIC_MAGIC),
+                    VERR_INVALID_MAGIC);
+
+    /*
+     * Xmit the packet down the appropriate VNIC interface.
+     */
+    int rc = VINF_SUCCESS;
+    mblk_t *pMsg = vboxNetFltSolarisMBlkFromSG(pThis, pSG, fDst);
+    if (RT_LIKELY(pMsg))
+    {
+        Log((DEVICE_NAME ":vboxNetFltPortOsXmit pThis=%p cbData=%d\n", pThis, MBLKL(pMsg)));
+
+        mac_tx_cookie_t pXmitCookie = mac_tx(pVNIC->hClient, pMsg, 0 /* Hint */, MAC_DROP_ON_NO_DESC, NULL /* return message */);
+        if (RT_LIKELY(!pXmitCookie))
+            return VINF_SUCCESS;
+
+        pMsg = NULL;
+        rc = VERR_NET_IO_ERROR;
+        LogRel((DEVICE_NAME ":vboxNetFltPortOsXmit Xmit failed pVNIC=%p.\n", pVNIC));
+    }
+    else
+    {
+        LogRel((DEVICE_NAME ":vboxNetFltPortOsXmit no memory for allocating Xmit packet.\n"));
+        rc = VERR_NO_MEMORY;
+    }
+
+    return rc;
+}
+
+
+void vboxNetFltPortOsNotifyMacAddress(PVBOXNETFLTINS pThis, void *pvIfData, PCRTMAC pMac)
+{
+    Log((DEVICE_NAME ":vboxNetFltPortOSNotifyMacAddress pszIf=%s pszVNIC=%s MAC=%.6Rhxs\n", pThis->szName,
+             ((PVBOXNETFLTVNIC)pvIfData)->szName, pMac));
+
+    /*
+     * Validate parameters.
+     */
+    PVBOXNETFLTVNIC pVNIC = pvIfData;
+    AssertMsgReturnVoid(VALID_PTR(pVNIC) && pVNIC->u32Magic == VBOXNETFLTVNIC_MAGIC,
+                    ("Invalid pVNIC=%p magic=%#x (expected %#x)\n", pvIfData,
+                     VALID_PTR(pVNIC) ? pVNIC->u32Magic : 0, VBOXNETFLTVNIC_MAGIC));
+    AssertMsgReturnVoid(pVNIC->hLinkId != DATALINK_INVALID_LINKID,
+                    ("Invalid hLinkId pVNIC=%p magic=%#x\n", pVNIC, pVNIC->u32Magic));
+
+    /*
+     * Set the MAC address of the VNIC to the one used by the VM interface.
+     */
+    uchar_t au8GuestMac[MAXMACADDRLEN];
+    bcopy(pMac->au8, au8GuestMac, sizeof(RTMAC));
+
+    vnic_mac_addr_type_t AddrType = VNIC_MAC_ADDR_TYPE_FIXED;
+    vnic_ioc_diag_t      Diag     = VNIC_IOC_DIAG_NONE;
+    int                  MacSlot  = 0;
+    int                  MacLen   = sizeof(RTMAC);
+
+    int rc = vnic_modify_addr(pVNIC->hLinkId, &AddrType, &MacLen, au8GuestMac, &MacSlot, 0 /* Mac-Prefix Length */, &Diag);
+    if (RT_LIKELY(!rc))
+    {
+        /*
+         * Remove existing unicast address, promisc. and the RX hook.
+         */
+#if 0
+        if (pVNIC->hUnicast)
+        {
+            mac_rx_clear(pVNIC->hClient);
+            mac_unicast_remove(pVNIC->hClient, pVNIC->hUnicast);
+            pVNIC->hUnicast = NULL;
+        }
+#endif
+
+        if (pVNIC->hPromisc)
+        {
+            mac_promisc_remove(pVNIC->hPromisc);
+            pVNIC->hPromisc = NULL;
+        }
+
+        mac_diag_t MacDiag = MAC_DIAG_NONE;
+        /* uint16_t uVLANId = pVNIC->pVNICTemplate ? pVNIC->pVNICTemplate->uVLANId : 0; */
+#if 0
+        rc = mac_unicast_add(pVNIC->hClient, NULL, MAC_UNICAST_PRIMARY, &pVNIC->hUnicast, 0 /* VLAN Id */, &MacDiag);
+#endif
+        if (RT_LIKELY(!rc))
+        {
+            rc = vboxNetFltSolarisSetPromisc(pThis, pVNIC);
+#if 0
+            if (RT_SUCCESS(rc))
+            {
+                /*
+                 * Set the RX receive function.
+                 * This shouldn't be necessary as vboxNetFltPortOsSetActive() will be invoked after this, but in the future,
+                 * if the guest NIC changes MAC address this may not be followed by a vboxNetFltPortOsSetActive() call,
+                 * so set it here anyway.
+                 */
+                mac_rx_set(pVNIC->hClient, vboxNetFltSolarisRecv, pThis);
+                Log((DEVICE_NAME ":vboxNetFltPortOsNotifyMacAddress successfully added unicast address %.6Rhxs\n", pMac));
+            }
+            else
+                LogRel((DEVICE_NAME ":vboxNetFltPortOsNotifyMacAddress failed to set promiscuous mode. rc=%d\n", rc));
+            mac_unicast_remove(pVNIC->hClient,  pVNIC->hUnicast);
+            pVNIC->hUnicast = NULL;
+#endif
+        }
+        else
+        {
+            LogRel((DEVICE_NAME ":vboxNetFltPortOsNotifyMacAddress failed to add primary unicast address. rc=%d Diag=%d\n", rc,
+                    MacDiag));
+        }
+    }
+    else
+    {
+        /*
+         * They really ought to use EEXIST, but I'm afraid this error comes from the VNIC device driver directly.
+         * Sequence: vnic_modify_addr()->mac_unicast_primary_set()->mac_update_macaddr() which uses a function pointer
+         * to the MAC driver (calls mac_vnic_unicast_set() in our case). Documented here if the error code should change we know
+         * where to look.
+         */
+        if (rc == ENOTSUP)
+        {
+            LogRel((DEVICE_NAME ":vboxNetFltPortOsNotifyMacAddress: failed! a VNIC with mac %.6Rhxs probably already exists.",
+                    pMac, rc));
+            LogRel((DEVICE_NAME ":vboxNetFltPortOsNotifyMacAddress: This NIC cannot establish connection. szName=%s szVNIC=%s\n",
+                    pThis->szName, pVNIC->szName));
+        }
+        else
+            LogRel((DEVICE_NAME ":vboxNetFltPortOsNotifyMacAddress failed! mac %.6Rhxs rc=%d Diag=%d\n", pMac, rc, Diag));
+    }
+}
+
+
+int vboxNetFltPortOsConnectInterface(PVBOXNETFLTINS pThis, void *pvIf, void **ppvIfData)
+{
+    Log((DEVICE_NAME ":vboxNetFltPortOsConnectInterface pThis=%p pvIf=%p\n", pThis, pvIf));
+
+    int rc = VINF_SUCCESS;
+
+    /*
+     * If the underlying interface is a physical interface or a VNIC template, we need to create
+     * a VNIC per guest NIC.
+     */
+    if (  !pThis->u.s.fIsVNIC
+        || pThis->u.s.fIsVNICTemplate)
+    {
+        PVBOXNETFLTVNIC pVNIC = NULL;
+        rc = vboxNetFltSolarisCreateVNIC(pThis, &pVNIC);
+        if (RT_SUCCESS(rc))
+        {
+            /*
+             * VM Interface<->VNIC association so that we can Xmit/Recv on the right ones.
+             */
+            pVNIC->pvIf = pvIf;
+            *ppvIfData = pVNIC;
+
+            /*
+             * Add the created VNIC to the list of VNICs we manage.
+             */
+            list_insert_tail(&pThis->u.s.hVNICs, pVNIC);
+            return VINF_SUCCESS;
+        }
+        else
+            LogRel((DEVICE_NAME ":vboxNetFltPortOsConnectInterface failed to create VNIC rc=%d\n", rc));
+    }
+    else
+    {
+        /*
+         * This is a VNIC passed to us, use it directly.
+         */
+        PVBOXNETFLTVNIC pVNIC = vboxNetFltSolarisAllocVNIC();
+        if (RT_LIKELY(pVNIC))
+        {
+            pVNIC->fCreated = false;
+
+            rc = mac_open_by_linkname(pThis->szName, &pVNIC->hInterface);
+            if (!rc)
+            {
+                /*
+                 * Obtain the data link ID for this VNIC, it's needed for modifying the MAC address among other things.
+                 */
+                rc = vboxNetFltSolarisGetLinkId(pThis->szName, &pVNIC->hLinkId);
+                if (RT_SUCCESS(rc))
+                {
+                    /*
+                     * Initialize the VNIC and add it to the list of managed VNICs.
+                     */
+                    RTStrPrintf(pVNIC->szName, sizeof(pVNIC->szName), "%s", pThis->szName);
+                    rc = vboxNetFltSolarisInitVNIC(pThis, pVNIC);
+                    if (!rc)
+                    {
+                        pVNIC->pvIf = pvIf;
+                        *ppvIfData = pVNIC;
+                        list_insert_head(&pThis->u.s.hVNICs, pVNIC);
+                        return VINF_SUCCESS;
+                    }
+                    else
+                        LogRel((DEVICE_NAME ":vboxNetFltPortOsConnectInterface failed to initialize VNIC. rc=%d\n", rc));
+                }
+                else
+                {
+                    LogRel((DEVICE_NAME ":vboxNetFltPortOsConnectInterface failed to get link id for '%s'. rc=%d\n",
+                            pThis->szName, rc));
+                }
+            }
+            else
+            {
+                LogRel((DEVICE_NAME ":vboxNetFltPortOsConnectInterface failed to open VNIC '%s'. rc=%d\n", pThis->szName, rc));
+                rc = VERR_OPEN_FAILED;
+            }
+
+            vboxNetFltSolarisFreeVNIC(pVNIC);
+        }
+        else
+        {
+            LogRel((DEVICE_NAME ":vboxNetFltOsInitInstance failed to allocate VNIC private data.\n"));
+            rc = VERR_NO_MEMORY;
+        }
+    }
+
+    return rc;
+}
+
+
+int vboxNetFltPortOsDisconnectInterface(PVBOXNETFLTINS pThis, void *pvIfData)
+{
+    Log((DEVICE_NAME ":vboxNetFltPortOsDisconnectInterface pThis=%p\n", pThis));
+
+    /*
+     * It is possible we get called when vboxNetFltPortOsConnectInterface() didn't succeed
+     * in which case pvIfData will be NULL. See intnetR0NetworkCreateIf() pfnConnectInterface call
+     * through reference counting in SUPR0ObjRelease() for the "pIf" object.
+     */
+    PVBOXNETFLTVNIC pVNIC = pvIfData;
+    if (RT_LIKELY(pVNIC))
+    {
+        AssertMsgReturn(pVNIC->u32Magic == VBOXNETFLTVNIC_MAGIC,
+                        ("Invalid magic=%#x (expected %#x)\n", pVNIC->u32Magic, VBOXNETFLTVNIC_MAGIC), VERR_INVALID_POINTER);
+
+        /*
+         * If the underlying interface is a physical interface or a VNIC template, we need to delete the created VNIC.
+         */
+        if (   !pThis->u.s.fIsVNIC
+            || pThis->u.s.fIsVNICTemplate)
+        {
+            /*
+             * Remove the VNIC from the list, destroy and free it.
+             */
+            list_remove(&pThis->u.s.hVNICs, pVNIC);
+            Log((DEVICE_NAME ":vboxNetFltPortOsDisconnectInterface destroying pVNIC=%p\n", pVNIC));
+            vboxNetFltSolarisDestroyVNIC(pVNIC);
+            vboxNetFltSolarisFreeVNIC(pVNIC);
+        }
+    }
+
+    return VINF_SUCCESS;
+}
+
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/solaris/vboxbow.conf b/src/VBox/HostDrivers/VBoxNetFlt/solaris/vboxbow.conf
new file mode 100644
index 00000000..e97f1f3a
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/solaris/vboxbow.conf
@@ -0,0 +1,33 @@
+# $Id: vboxbow.conf $
+## @file
+# Solaris Host VBoxBow (Crossbow) Configuration
+#
+
+#
+# Copyright (C) 2008-2020 Oracle Corporation
+#
+# This file is part of VirtualBox Open Source Edition (OSE), as
+# available from http://www.virtualbox.org. This file is free software;
+# you can redistribute it and/or modify it under the terms of the GNU
+# General Public License (GPL) as published by the Free Software
+# Foundation, in version 2 as it comes in the "COPYING" file of the
+# VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+# hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+#
+# The contents of this file may alternatively be used under the terms
+# of the Common Development and Distribution License Version 1.0
+# (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+# VirtualBox OSE distribution, in which case the provisions of the
+# CDDL are applicable instead of those of the GPL.
+#
+# You may elect to license modified versions of this file under the
+# terms and conditions of either the GPL or the CDDL or both.
+#
+
+# This needs to go into /platform/i86pc/kernel/drv,
+# while the 64-bit driver object goes into the amd64
+# subdirectory (32-bit drivers goes into the same
+# directory).
+#
+name="vboxbow" parent="pseudo" instance=0;
+
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/solaris/vboxflt.conf b/src/VBox/HostDrivers/VBoxNetFlt/solaris/vboxflt.conf
new file mode 100644
index 00000000..721ff6d2
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/solaris/vboxflt.conf
@@ -0,0 +1,46 @@
+# $Id: vboxflt.conf $
+## @file
+# Solaris Host VBoxFlt Configuration
+#
+
+#
+# Copyright (C) 2008-2020 Oracle Corporation
+#
+# This file is part of VirtualBox Open Source Edition (OSE), as
+# available from http://www.virtualbox.org. This file is free software;
+# you can redistribute it and/or modify it under the terms of the GNU
+# General Public License (GPL) as published by the Free Software
+# Foundation, in version 2 as it comes in the "COPYING" file of the
+# VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+# hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+#
+# The contents of this file may alternatively be used under the terms
+# of the Common Development and Distribution License Version 1.0
+# (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+# VirtualBox OSE distribution, in which case the provisions of the
+# CDDL are applicable instead of those of the GPL.
+#
+# You may elect to license modified versions of this file under the
+# terms and conditions of either the GPL or the CDDL or both.
+#
+
+# This needs to go into /platform/i86pc/kernel/drv,
+# while the 64-bit driver object goes into the amd64
+# subdirectory (32-bit drivers goes into the same
+# directory).
+#
+name="vboxflt" parent="pseudo" instance=0;
+
+# If the interface being used does not have IPv6 plumbed and you want
+# vboxflt to automatically attach to it by checking for Ipv6 stream every
+# "ipv6-pollinterval" seconds.
+#
+# By default this is disabled meaning if the interface does not have Ipv6
+# plumbed when the virtual machine starts, guest<->host Ipv6 will not work
+# though guest<->remote Ipv6 would work.
+#
+# Enable if you have a dynamically plumbing/unplumbing Ipv6 interface for
+# which you want vboxflt to adjust accordingly, otherwise keep this disabled.
+# Enabling this option will have some minor performance penalty.
+#ipv6-pollinterval=3;
+
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/Makefile.kup b/src/VBox/HostDrivers/VBoxNetFlt/win/Makefile.kup
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/Makefile.kup
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/cfg/Makefile.kup b/src/VBox/HostDrivers/VBoxNetFlt/win/cfg/Makefile.kup
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/cfg/Makefile.kup
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/cfg/VBoxNetCfg.cpp b/src/VBox/HostDrivers/VBoxNetFlt/win/cfg/VBoxNetCfg.cpp
new file mode 100644
index 00000000..83919743
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/cfg/VBoxNetCfg.cpp
@@ -0,0 +1,3835 @@
+/* $Id: VBoxNetCfg.cpp $ */
+/** @file
+ * VBoxNetCfg.cpp - Network Configuration API.
+ */
+/*
+ * Copyright (C) 2011-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+#include "VBox/VBoxNetCfg-win.h"
+#include "VBox/VBoxDrvCfg-win.h"
+
+#define _WIN32_DCOM
+
+#include <devguid.h>
+#include <stdio.h>
+#include <regstr.h>
+#include <iprt/win/shlobj.h>
+#include <cfgmgr32.h>
+#include <tchar.h>
+#include <iprt/win/objbase.h>
+
+#include <crtdbg.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <Wbemidl.h>
+#include <comdef.h>
+
+#include <iprt/win/winsock2.h>
+#include <iprt/win/ws2tcpip.h>
+#include <ws2ipdef.h>
+#include <iprt/win/netioapi.h>
+#include <iprt/win/iphlpapi.h>
+
+#include <set>
+
+#ifndef Assert   /** @todo r=bird: where would this be defined? */
+//# ifdef DEBUG
+//#  define Assert(_expr) assert(_expr)
+//# else
+//#  define Assert(_expr) do{ }while (0)
+//# endif
+# define Assert _ASSERT
+# define AssertMsg(expr, msg) do{}while (0)
+#endif
+static LOG_ROUTINE g_Logger = NULL;
+
+static VOID DoLogging(LPCSTR szString, ...);
+#define NonStandardLog DoLogging
+#define NonStandardLogFlow(x) DoLogging x
+
+#define DbgLog                              /** @todo r=bird: What does this do? */
+
+#define VBOX_NETCFG_LOCK_TIME_OUT     5000  /** @todo r=bird: What does this do? */
+
+#define VBOXNETCFGWIN_NETADP_ID L"sun_VBoxNetAdp"
+
+/*
+* Wrappers for HelpAPI functions
+*/
+typedef void FNINITIALIZEIPINTERFACEENTRY( _Inout_ PMIB_IPINTERFACE_ROW row);
+typedef FNINITIALIZEIPINTERFACEENTRY *PFNINITIALIZEIPINTERFACEENTRY;
+
+typedef NETIOAPI_API FNGETIPINTERFACEENTRY( _Inout_ PMIB_IPINTERFACE_ROW row);
+typedef FNGETIPINTERFACEENTRY *PFNGETIPINTERFACEENTRY;
+
+typedef NETIOAPI_API FNSETIPINTERFACEENTRY( _Inout_ PMIB_IPINTERFACE_ROW row);
+typedef FNSETIPINTERFACEENTRY *PFNSETIPINTERFACEENTRY;
+
+static  PFNINITIALIZEIPINTERFACEENTRY   g_pfnInitializeIpInterfaceEntry = NULL;
+static  PFNGETIPINTERFACEENTRY          g_pfnGetIpInterfaceEntry        = NULL;
+static  PFNSETIPINTERFACEENTRY          g_pfnSetIpInterfaceEntry        = NULL;
+
+
+/*
+* Forward declaration for using vboxNetCfgWinSetupMetric()
+*/
+HRESULT vboxNetCfgWinSetupMetric(IN NET_LUID* pLuid);
+HRESULT vboxNetCfgWinGetInterfaceLUID(IN HKEY hKey, OUT NET_LUID* pLUID);
+
+
+/*
+ * For some weird reason we do not want to use IPRT here, hence the following
+ * function provides a replacement for BstrFmt.
+ */
+static bstr_t bstr_printf(const char *cszFmt, ...)
+{
+    char szBuffer[4096];
+    szBuffer[sizeof(szBuffer) - 1] = 0; /* Make sure the string will be null-terminated */
+    va_list va;
+    va_start(va, cszFmt);
+    _vsnprintf(szBuffer, sizeof(szBuffer) - 1, cszFmt, va);
+    va_end(va);
+    return bstr_t(szBuffer);
+}
+
+static HRESULT vboxNetCfgWinINetCfgLock(IN INetCfg *pNetCfg,
+                                        IN LPCWSTR pszwClientDescription,
+                                        IN DWORD cmsTimeout,
+                                        OUT LPWSTR *ppszwClientDescription)
+{
+    INetCfgLock *pLock;
+    HRESULT hr = pNetCfg->QueryInterface(IID_INetCfgLock, (PVOID*)&pLock);
+    if (FAILED(hr))
+    {
+        NonStandardLogFlow(("QueryInterface failed, hr (0x%x)\n", hr));
+        return hr;
+    }
+
+    hr = pLock->AcquireWriteLock(cmsTimeout, pszwClientDescription, ppszwClientDescription);
+    if (hr == S_FALSE)
+    {
+        NonStandardLogFlow(("Write lock busy\n"));
+    }
+    else if (FAILED(hr))
+    {
+        NonStandardLogFlow(("AcquireWriteLock failed, hr (0x%x)\n", hr));
+    }
+
+    pLock->Release();
+    return hr;
+}
+
+static HRESULT vboxNetCfgWinINetCfgUnlock(IN INetCfg *pNetCfg)
+{
+    INetCfgLock *pLock;
+    HRESULT hr = pNetCfg->QueryInterface(IID_INetCfgLock, (PVOID*)&pLock);
+    if (FAILED(hr))
+    {
+        NonStandardLogFlow(("QueryInterface failed, hr (0x%x)\n", hr));
+        return hr;
+    }
+
+    hr = pLock->ReleaseWriteLock();
+    if (FAILED(hr))
+        NonStandardLogFlow(("ReleaseWriteLock failed, hr (0x%x)\n", hr));
+
+    pLock->Release();
+    return hr;
+}
+
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinQueryINetCfg(OUT INetCfg **ppNetCfg,
+                                                      IN BOOL fGetWriteLock,
+                                                      IN LPCWSTR pszwClientDescription,
+                                                      IN DWORD cmsTimeout,
+                                                      OUT LPWSTR *ppszwClientDescription)
+{
+    INetCfg *pNetCfg;
+    HRESULT hr = CoCreateInstance(CLSID_CNetCfg, NULL, CLSCTX_INPROC_SERVER, IID_INetCfg, (PVOID*)&pNetCfg);
+    if (FAILED(hr))
+    {
+        NonStandardLogFlow(("CoCreateInstance failed, hr (0x%x)\n", hr));
+        return hr;
+    }
+
+    if (fGetWriteLock)
+    {
+        hr = vboxNetCfgWinINetCfgLock(pNetCfg, pszwClientDescription, cmsTimeout, ppszwClientDescription);
+        if (hr == S_FALSE)
+        {
+            NonStandardLogFlow(("Write lock is busy\n", hr));
+            hr = NETCFG_E_NO_WRITE_LOCK;
+        }
+    }
+
+    if (SUCCEEDED(hr))
+    {
+        hr = pNetCfg->Initialize(NULL);
+        if (SUCCEEDED(hr))
+        {
+            *ppNetCfg = pNetCfg;
+            return S_OK;
+        }
+        else
+            NonStandardLogFlow(("Initialize failed, hr (0x%x)\n", hr));
+    }
+
+    pNetCfg->Release();
+    return hr;
+}
+
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinReleaseINetCfg(IN INetCfg *pNetCfg, IN BOOL fHasWriteLock)
+{
+    if (!pNetCfg) /* If network config has been released already, just bail out. */
+    {
+        NonStandardLogFlow(("Warning: No network config given but write lock is set to TRUE\n"));
+        return S_OK;
+    }
+
+    HRESULT hr = pNetCfg->Uninitialize();
+    if (FAILED(hr))
+    {
+        NonStandardLogFlow(("Uninitialize failed, hr (0x%x)\n", hr));
+        /* Try to release the write lock below. */
+    }
+
+    if (fHasWriteLock)
+    {
+        HRESULT hr2 = vboxNetCfgWinINetCfgUnlock(pNetCfg);
+        if (FAILED(hr2))
+            NonStandardLogFlow(("vboxNetCfgWinINetCfgUnlock failed, hr (0x%x)\n", hr2));
+        if (SUCCEEDED(hr))
+            hr = hr2;
+    }
+
+    pNetCfg->Release();
+    return hr;
+}
+
+static HRESULT vboxNetCfgWinGetComponentByGuidEnum(IEnumNetCfgComponent *pEnumNcc,
+                                                   IN const GUID *pGuid,
+                                                   OUT INetCfgComponent **ppNcc)
+{
+    HRESULT hr = pEnumNcc->Reset();
+    if (FAILED(hr))
+    {
+        NonStandardLogFlow(("Reset failed, hr (0x%x)\n", hr));
+        return hr;
+    }
+
+    INetCfgComponent *pNcc;
+    while ((hr = pEnumNcc->Next(1, &pNcc, NULL)) == S_OK)
+    {
+        ULONG uComponentStatus;
+        hr = pNcc->GetDeviceStatus(&uComponentStatus);
+        if (SUCCEEDED(hr))
+        {
+            if (uComponentStatus == 0)
+            {
+                GUID NccGuid;
+                hr = pNcc->GetInstanceGuid(&NccGuid);
+
+                if (SUCCEEDED(hr))
+                {
+                    if (NccGuid == *pGuid)
+                    {
+                        /* found the needed device */
+                        *ppNcc = pNcc;
+                        break;
+                    }
+                }
+                else
+                    NonStandardLogFlow(("GetInstanceGuid failed, hr (0x%x)\n", hr));
+            }
+        }
+
+        pNcc->Release();
+    }
+    return hr;
+}
+
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinGetComponentByGuid(IN INetCfg *pNc,
+                                                            IN const GUID *pguidClass,
+                                                            IN const GUID * pComponentGuid,
+                                                            OUT INetCfgComponent **ppncc)
+{
+    IEnumNetCfgComponent *pEnumNcc;
+    HRESULT hr = pNc->EnumComponents(pguidClass, &pEnumNcc);
+
+    if (SUCCEEDED(hr))
+    {
+        hr = vboxNetCfgWinGetComponentByGuidEnum(pEnumNcc, pComponentGuid, ppncc);
+        if (hr == S_FALSE)
+        {
+            NonStandardLogFlow(("Component not found\n"));
+        }
+        else if (FAILED(hr))
+        {
+            NonStandardLogFlow(("vboxNetCfgWinGetComponentByGuidEnum failed, hr (0x%x)\n", hr));
+        }
+        pEnumNcc->Release();
+    }
+    else
+        NonStandardLogFlow(("EnumComponents failed, hr (0x%x)\n", hr));
+    return hr;
+}
+
+static HRESULT vboxNetCfgWinQueryInstaller(IN INetCfg *pNetCfg, IN const GUID *pguidClass, INetCfgClassSetup **ppSetup)
+{
+    HRESULT hr = pNetCfg->QueryNetCfgClass(pguidClass, IID_INetCfgClassSetup, (void**)ppSetup);
+    if (FAILED(hr))
+        NonStandardLogFlow(("QueryNetCfgClass failed, hr (0x%x)\n", hr));
+    return hr;
+}
+
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinInstallComponent(IN INetCfg *pNetCfg, IN LPCWSTR pszwComponentId, IN const GUID *pguidClass,
+                                                          OUT INetCfgComponent **ppComponent)
+{
+    INetCfgClassSetup *pSetup;
+    HRESULT hr = vboxNetCfgWinQueryInstaller(pNetCfg, pguidClass, &pSetup);
+    if (FAILED(hr))
+    {
+        NonStandardLogFlow(("vboxNetCfgWinQueryInstaller failed, hr (0x%x)\n", hr));
+        return hr;
+    }
+
+    OBO_TOKEN Token;
+    ZeroMemory(&Token, sizeof (Token));
+    Token.Type = OBO_USER;
+    INetCfgComponent* pTempComponent = NULL;
+
+    hr = pSetup->Install(pszwComponentId, &Token,
+                         0,    /* IN DWORD dwSetupFlags */
+                         0,    /* IN DWORD dwUpgradeFromBuildNo */
+                         NULL, /* IN LPCWSTR pszwAnswerFile */
+                         NULL, /* IN LPCWSTR pszwAnswerSections */
+                         &pTempComponent);
+    if (SUCCEEDED(hr))
+    {
+        if (pTempComponent != NULL)
+        {
+            HKEY hkey = (HKEY)INVALID_HANDLE_VALUE;
+            HRESULT res;
+
+            /*
+            *   Set default metric value of interface to fix multicast issue
+            *   See @bugref{6379} for details.
+            */
+            res = pTempComponent->OpenParamKey(&hkey);
+
+            /* Set default metric value for host-only interface only */
+            if (   SUCCEEDED(res)
+                && hkey != INVALID_HANDLE_VALUE
+                && wcsnicmp(pszwComponentId, VBOXNETCFGWIN_NETADP_ID, 256) == 0)
+            {
+                NET_LUID luid;
+                res = vboxNetCfgWinGetInterfaceLUID(hkey, &luid);
+
+                /* Close the key as soon as possible. See @bugref{7973}. */
+                RegCloseKey (hkey);
+                hkey = (HKEY)INVALID_HANDLE_VALUE;
+
+                if (FAILED(res))
+                {
+                    /*
+                     *   The setting of Metric is not very important functionality,
+                     *   So we will not break installation process due to this error.
+                     */
+                    NonStandardLogFlow(("VBoxNetCfgWinInstallComponent Warning! "
+                                        "vboxNetCfgWinGetInterfaceLUID failed, default metric "
+                                        "for new interface will not be set, hr (0x%x)\n", res));
+                }
+                else
+                {
+                    res = vboxNetCfgWinSetupMetric(&luid);
+                    if (FAILED(res))
+                    {
+                        /*
+                         *   The setting of Metric is not very important functionality,
+                         *   So we will not break installation process due to this error.
+                         */
+                        NonStandardLogFlow(("VBoxNetCfgWinInstallComponent Warning! "
+                                            "vboxNetCfgWinSetupMetric failed, default metric "
+                                            "for new interface will not be set, hr (0x%x)\n", res));
+                    }
+                }
+            }
+            if (hkey != INVALID_HANDLE_VALUE)
+            {
+                RegCloseKey (hkey);
+                hkey = (HKEY)INVALID_HANDLE_VALUE;
+            }
+            if (ppComponent != NULL)
+                *ppComponent = pTempComponent;
+            else
+                pTempComponent->Release();
+        }
+
+        /* ignore the apply failure */
+        HRESULT tmpHr = pNetCfg->Apply();
+        Assert(tmpHr == S_OK);
+        if (tmpHr != S_OK)
+            NonStandardLogFlow(("Apply failed, hr (0x%x)\n", tmpHr));
+    }
+    else
+        NonStandardLogFlow(("Install failed, hr (0x%x)\n", hr));
+
+    pSetup->Release();
+    return hr;
+}
+
+static HRESULT vboxNetCfgWinInstallInfAndComponent(IN INetCfg *pNetCfg, IN LPCWSTR pszwComponentId, IN const GUID *pguidClass,
+                                                   IN LPCWSTR const *apInfPaths, IN UINT cInfPaths,
+                                                   OUT INetCfgComponent **ppComponent)
+{
+    HRESULT hr = S_OK;
+    UINT cFilesProcessed = 0;
+
+    NonStandardLogFlow(("Installing %u INF files ...\n", cInfPaths));
+
+    for (; cFilesProcessed < cInfPaths; cFilesProcessed++)
+    {
+        NonStandardLogFlow(("Installing INF file \"%ws\" ...\n", apInfPaths[cFilesProcessed]));
+        hr = VBoxDrvCfgInfInstall(apInfPaths[cFilesProcessed]);
+        if (FAILED(hr))
+        {
+            NonStandardLogFlow(("VBoxNetCfgWinInfInstall failed, hr (0x%x)\n", hr));
+            break;
+        }
+    }
+
+    if (SUCCEEDED(hr))
+    {
+        hr = VBoxNetCfgWinInstallComponent(pNetCfg, pszwComponentId, pguidClass, ppComponent);
+        if (FAILED(hr))
+            NonStandardLogFlow(("VBoxNetCfgWinInstallComponent failed, hr (0x%x)\n", hr));
+    }
+
+    if (FAILED(hr))
+    {
+        NonStandardLogFlow(("Installation failed, rolling back installation set ...\n"));
+
+        do
+        {
+            HRESULT hr2 = VBoxDrvCfgInfUninstall(apInfPaths[cFilesProcessed], 0);
+            if (FAILED(hr2))
+                NonStandardLogFlow(("VBoxDrvCfgInfUninstall failed, hr (0x%x)\n", hr2));
+                /* Keep going. */
+            if (!cFilesProcessed)
+                break;
+        } while (cFilesProcessed--);
+
+        NonStandardLogFlow(("Rollback complete\n"));
+    }
+
+    return hr;
+}
+
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinUninstallComponent(IN INetCfg *pNetCfg, IN INetCfgComponent *pComponent)
+{
+    GUID GuidClass;
+    HRESULT hr = pComponent->GetClassGuid(&GuidClass);
+    if (FAILED(hr))
+    {
+        NonStandardLogFlow(("GetClassGuid failed, hr (0x%x)\n", hr));
+        return hr;
+    }
+
+    INetCfgClassSetup *pSetup = NULL;
+    hr = vboxNetCfgWinQueryInstaller(pNetCfg, &GuidClass, &pSetup);
+    if (FAILED(hr))
+    {
+        NonStandardLogFlow(("vboxNetCfgWinQueryInstaller failed, hr (0x%x)\n", hr));
+        return hr;
+    }
+
+    OBO_TOKEN Token;
+    ZeroMemory(&Token, sizeof(Token));
+    Token.Type = OBO_USER;
+
+    hr = pSetup->DeInstall(pComponent, &Token, NULL /* OUT LPWSTR *pmszwRefs */);
+    if (SUCCEEDED(hr))
+    {
+        hr = pNetCfg->Apply();
+        if (FAILED(hr))
+            NonStandardLogFlow(("Apply failed, hr (0x%x)\n", hr));
+    }
+    else
+        NonStandardLogFlow(("DeInstall failed, hr (0x%x)\n", hr));
+
+    if (pSetup)
+        pSetup->Release();
+    return hr;
+}
+
+typedef BOOL (*VBOXNETCFGWIN_NETCFGENUM_CALLBACK) (IN INetCfg *pNetCfg, IN INetCfgComponent *pNetCfgComponent, PVOID pContext);
+
+static HRESULT vboxNetCfgWinEnumNetCfgComponents(IN INetCfg *pNetCfg,
+                                                 IN const GUID *pguidClass,
+                                                 VBOXNETCFGWIN_NETCFGENUM_CALLBACK callback,
+                                                 PVOID pContext)
+{
+    IEnumNetCfgComponent *pEnumComponent;
+    HRESULT hr = pNetCfg->EnumComponents(pguidClass, &pEnumComponent);
+    if (SUCCEEDED(hr))
+    {
+        INetCfgComponent *pNetCfgComponent;
+        hr = pEnumComponent->Reset();
+        do
+        {
+            hr = pEnumComponent->Next(1, &pNetCfgComponent, NULL);
+            if (hr == S_OK)
+            {
+//                ULONG uComponentStatus;
+//                hr = pNcc->GetDeviceStatus(&uComponentStatus);
+//                if (SUCCEEDED(hr))
+                BOOL fResult = FALSE;
+                if (pNetCfgComponent)
+                {
+                    if (pContext)
+                        fResult = callback(pNetCfg, pNetCfgComponent, pContext);
+                    pNetCfgComponent->Release();
+                }
+
+                if (!fResult)
+                    break;
+            }
+            else
+            {
+                if (hr == S_FALSE)
+                {
+                    hr = S_OK;
+                }
+                else
+                    NonStandardLogFlow(("Next failed, hr (0x%x)\n", hr));
+                break;
+            }
+        } while (true);
+        pEnumComponent->Release();
+    }
+    return hr;
+}
+
+/*
+ * Forward declarations of functions used in vboxNetCfgWinRemoveAllNetDevicesOfIdCallback.
+ */
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinGenHostonlyConnectionName(PCWSTR DevName, WCHAR *pBuf, PULONG pcbBuf);
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinRenameConnection(LPWSTR pGuid, PCWSTR NewName);
+
+static BOOL vboxNetCfgWinRemoveAllNetDevicesOfIdCallback(HDEVINFO hDevInfo, PSP_DEVINFO_DATA pDev, PVOID pvContext)
+{
+    RT_NOREF1(pvContext);
+    SP_REMOVEDEVICE_PARAMS rmdParams;
+    memset(&rmdParams, 0, sizeof(SP_REMOVEDEVICE_PARAMS));
+    rmdParams.ClassInstallHeader.cbSize = sizeof(SP_CLASSINSTALL_HEADER);
+    rmdParams.ClassInstallHeader.InstallFunction = DIF_REMOVE;
+    rmdParams.Scope = DI_REMOVEDEVICE_GLOBAL;
+
+    if (SetupDiSetClassInstallParams(hDevInfo,pDev,
+                                     &rmdParams.ClassInstallHeader, sizeof(rmdParams)))
+    {
+        if (SetupDiSetSelectedDevice(hDevInfo, pDev))
+        {
+#ifndef VBOXNETCFG_DELAYEDRENAME
+            /* Figure out NetCfgInstanceId. */
+            HKEY hKey = SetupDiOpenDevRegKey(hDevInfo,
+                                             pDev,
+                                             DICS_FLAG_GLOBAL,
+                                             0,
+                                             DIREG_DRV,
+                                             KEY_READ);
+            if (hKey == INVALID_HANDLE_VALUE)
+            {
+                NonStandardLogFlow(("vboxNetCfgWinRemoveAllNetDevicesOfIdCallback: SetupDiOpenDevRegKey failed with error %ld\n",
+                                    GetLastError()));
+            }
+            else
+            {
+                WCHAR wszCfgGuidString[50] = { L'' };
+                DWORD cbSize = sizeof(wszCfgGuidString);
+                DWORD dwValueType;
+                DWORD ret = RegQueryValueExW(hKey, L"NetCfgInstanceId", NULL,
+                                             &dwValueType, (LPBYTE)wszCfgGuidString, &cbSize);
+                if (ret == ERROR_SUCCESS)
+                {
+                    NonStandardLogFlow(("vboxNetCfgWinRemoveAllNetDevicesOfIdCallback: Processing device ID \"%S\"\n",
+                                        wszCfgGuidString));
+
+                    /* Figure out device name. */
+                    WCHAR wszDevName[256], wszTempName[256];
+                    ULONG cbName = sizeof(wszTempName);
+
+                    if (SetupDiGetDeviceRegistryPropertyW(hDevInfo, pDev,
+                                                          SPDRP_FRIENDLYNAME, /* IN  DWORD Property,*/
+                                                          NULL,               /* OUT PDWORD PropertyRegDataType, OPTIONAL*/
+                                                          (PBYTE)wszDevName,  /* OUT PBYTE PropertyBuffer,*/
+                                                          sizeof(wszDevName), /* IN  DWORD PropertyBufferSize,*/
+                                                          NULL                /* OUT PDWORD RequiredSize OPTIONAL*/))
+                    {
+                        /*
+                         * Rename the connection before removing the device. This will
+                         * hopefully prevent an error when we will be attempting
+                         * to rename a newly created connection (see @bugref{6740}).
+                         */
+                        HRESULT hr = VBoxNetCfgWinGenHostonlyConnectionName(wszDevName, wszTempName, &cbName);
+                        wcscat_s(wszTempName, sizeof(wszTempName), L" removed");
+                        if (SUCCEEDED(hr))
+                            hr = VBoxNetCfgWinRenameConnection(wszCfgGuidString, wszTempName);
+                        //NonStandardLogFlow(("VBoxNetCfgWinRenameConnection(%S,%S) => 0x%x\n", pWCfgGuidString, TempName, hr_tmp));
+                    }
+                    else
+                    {
+                        NonStandardLogFlow(("vboxNetCfgWinRemoveAllNetDevicesOfIdCallback: Failed to get friendly name for device \"%S\"\n",
+                                            wszCfgGuidString));
+                    }
+                }
+                else
+                {
+                    NonStandardLogFlow(("vboxNetCfgWinRemoveAllNetDevicesOfIdCallback: Querying instance ID failed with %d\n",
+                                        ret));
+                }
+
+                RegCloseKey(hKey);
+            }
+#endif /* VBOXNETCFG_DELAYEDRENAME */
+
+            if (SetupDiCallClassInstaller(DIF_REMOVE, hDevInfo, pDev))
+            {
+                SP_DEVINSTALL_PARAMS devParams;
+                memset(&devParams, 0, sizeof(SP_DEVINSTALL_PARAMS));
+                devParams.cbSize = sizeof(devParams);
+
+                if (SetupDiGetDeviceInstallParams(hDevInfo, pDev, &devParams))
+                {
+                    if (   (devParams.Flags & DI_NEEDRESTART)
+                        || (devParams.Flags & DI_NEEDREBOOT))
+                    {
+                        NonStandardLog(("vboxNetCfgWinRemoveAllNetDevicesOfIdCallback: A reboot is required\n"));
+                    }
+                }
+                else
+                    NonStandardLogFlow(("vboxNetCfgWinRemoveAllNetDevicesOfIdCallback: SetupDiGetDeviceInstallParams failed with %ld\n",
+                                        GetLastError()));
+            }
+            else
+                NonStandardLogFlow(("vboxNetCfgWinRemoveAllNetDevicesOfIdCallback: SetupDiCallClassInstaller failed with %ld\n",
+                                    GetLastError()));
+        }
+        else
+            NonStandardLogFlow(("vboxNetCfgWinRemoveAllNetDevicesOfIdCallback: SetupDiSetSelectedDevice failed with %ld\n",
+                                GetLastError()));
+    }
+    else
+        NonStandardLogFlow(("vboxNetCfgWinRemoveAllNetDevicesOfIdCallback: SetupDiSetClassInstallParams failed with %ld\n",
+                            GetLastError()));
+
+    /* Continue enumeration. */
+    return TRUE;
+}
+
+typedef struct VBOXNECTFGWINPROPCHANGE
+{
+    VBOXNECTFGWINPROPCHANGE_TYPE enmPcType;
+    HRESULT hr;
+} VBOXNECTFGWINPROPCHANGE ,*PVBOXNECTFGWINPROPCHANGE;
+
+static BOOL vboxNetCfgWinPropChangeAllNetDevicesOfIdCallback(HDEVINFO hDevInfo, PSP_DEVINFO_DATA pDev, PVOID pContext)
+{
+    PVBOXNECTFGWINPROPCHANGE pPc = (PVBOXNECTFGWINPROPCHANGE)pContext;
+
+    SP_PROPCHANGE_PARAMS PcParams;
+    memset (&PcParams, 0, sizeof (PcParams));
+    PcParams.ClassInstallHeader.cbSize = sizeof(SP_CLASSINSTALL_HEADER);
+    PcParams.ClassInstallHeader.InstallFunction = DIF_PROPERTYCHANGE;
+    PcParams.Scope = DICS_FLAG_GLOBAL;
+
+    switch(pPc->enmPcType)
+    {
+        case VBOXNECTFGWINPROPCHANGE_TYPE_DISABLE:
+            PcParams.StateChange = DICS_DISABLE;
+            NonStandardLogFlow(("vboxNetCfgWinPropChangeAllNetDevicesOfIdCallback: Change type (DICS_DISABLE): %d\n", pPc->enmPcType));
+            break;
+        case VBOXNECTFGWINPROPCHANGE_TYPE_ENABLE:
+            PcParams.StateChange = DICS_ENABLE;
+            NonStandardLogFlow(("vboxNetCfgWinPropChangeAllNetDevicesOfIdCallback: Change type (DICS_ENABLE): %d\n", pPc->enmPcType));
+            break;
+        default:
+            NonStandardLogFlow(("vboxNetCfgWinPropChangeAllNetDevicesOfIdCallback: Unexpected prop change type: %d\n", pPc->enmPcType));
+            pPc->hr = E_INVALIDARG;
+            return FALSE;
+    }
+
+    if (SetupDiSetClassInstallParams(hDevInfo, pDev, &PcParams.ClassInstallHeader, sizeof(PcParams)))
+    {
+        if (SetupDiSetSelectedDevice(hDevInfo, pDev))
+        {
+            if (SetupDiCallClassInstaller(DIF_PROPERTYCHANGE, hDevInfo, pDev))
+            {
+                SP_DEVINSTALL_PARAMS devParams;
+                devParams.cbSize = sizeof(devParams);
+                if (SetupDiGetDeviceInstallParams(hDevInfo,pDev,&devParams))
+                {
+                    if (   (devParams.Flags & DI_NEEDRESTART)
+                        || (devParams.Flags & DI_NEEDREBOOT))
+                    {
+                        NonStandardLog(("vboxNetCfgWinPropChangeAllNetDevicesOfIdCallback: A reboot is required\n"));
+                    }
+                }
+                else
+                    NonStandardLogFlow(("vboxNetCfgWinPropChangeAllNetDevicesOfIdCallback: SetupDiGetDeviceInstallParams failed with %ld\n",
+                                        GetLastError()));
+            }
+            else
+                NonStandardLogFlow(("vboxNetCfgWinPropChangeAllNetDevicesOfIdCallback: SetupDiCallClassInstaller failed with %ld\n",
+                                    GetLastError()));
+        }
+        else
+            NonStandardLogFlow(("SetupDiSetSelectedDevice failed with %ld\n", GetLastError()));
+    }
+    else
+        NonStandardLogFlow(("SetupDiSetClassInstallParams failed with %ld\n", GetLastError()));
+
+    /* Continue enumeration. */
+    return TRUE;
+}
+
+typedef BOOL (*PFNVBOXNETCFGWINNETENUMCALLBACK)(HDEVINFO hDevInfo, PSP_DEVINFO_DATA pDev, PVOID pContext);
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinEnumNetDevices(LPCWSTR pwszPnPId,
+                                                        PFNVBOXNETCFGWINNETENUMCALLBACK pfnCallback, PVOID pvContext)
+{
+    NonStandardLogFlow(("VBoxNetCfgWinEnumNetDevices: Searching for: %S\n", pwszPnPId));
+
+    HRESULT hr;
+    HDEVINFO hDevInfo = SetupDiGetClassDevsExW(&GUID_DEVCLASS_NET,
+                                               NULL,            /* IN PCTSTR Enumerator, OPTIONAL */
+                                               NULL,            /* IN HWND hwndParent, OPTIONAL */
+                                               DIGCF_PRESENT,   /* IN DWORD Flags,*/
+                                               NULL,            /* IN HDEVINFO DeviceInfoSet, OPTIONAL */
+                                               NULL,            /* IN PCTSTR MachineName, OPTIONAL */
+                                               NULL             /* IN PVOID Reserved */);
+    if (hDevInfo != INVALID_HANDLE_VALUE)
+    {
+        DWORD winEr = NO_ERROR;
+
+        DWORD dwDevId = 0;
+        size_t cPnPId = wcslen(pwszPnPId);
+
+        PBYTE pBuffer = NULL;
+
+        for (;;)
+        {
+            SP_DEVINFO_DATA Dev;
+            memset(&Dev, 0, sizeof(SP_DEVINFO_DATA));
+            Dev.cbSize = sizeof(SP_DEVINFO_DATA);
+
+            if (!SetupDiEnumDeviceInfo(hDevInfo, dwDevId, &Dev))
+            {
+                winEr = GetLastError();
+                if (winEr == ERROR_NO_MORE_ITEMS)
+                    winEr = ERROR_SUCCESS;
+                break;
+            }
+
+            NonStandardLogFlow(("VBoxNetCfgWinEnumNetDevices: Enumerating device %ld ... \n", dwDevId));
+            dwDevId++;
+
+            if (pBuffer)
+                free(pBuffer);
+            pBuffer = NULL;
+            DWORD cbBuffer = 0;
+            DWORD cbRequired = 0;
+
+            if (!SetupDiGetDeviceRegistryPropertyW(hDevInfo, &Dev,
+                                                   SPDRP_HARDWAREID, /* IN DWORD Property */
+                                                   NULL,             /* OUT PDWORD PropertyRegDataType OPTIONAL */
+                                                   pBuffer,          /* OUT PBYTE PropertyBuffer */
+                                                   cbBuffer,         /* IN DWORD PropertyBufferSize */
+                                                   &cbRequired       /* OUT PDWORD RequiredSize OPTIONAL */))
+            {
+                winEr = GetLastError();
+                if (winEr != ERROR_INSUFFICIENT_BUFFER)
+                {
+                    NonStandardLogFlow(("VBoxNetCfgWinEnumNetDevices: SetupDiGetDeviceRegistryPropertyW (1) failed with %ld\n", winEr));
+                    break;
+                }
+
+                pBuffer = (PBYTE)malloc(cbRequired);
+                if (!pBuffer)
+                {
+                    NonStandardLogFlow(("VBoxNetCfgWinEnumNetDevices: Out of memory allocating %ld bytes\n",
+                                        cbRequired));
+                    winEr = ERROR_OUTOFMEMORY;
+                    break;
+                }
+
+                cbBuffer = cbRequired;
+
+                if (!SetupDiGetDeviceRegistryPropertyW(hDevInfo,&Dev,
+                                                       SPDRP_HARDWAREID, /* IN DWORD Property */
+                                                       NULL,             /* OUT PDWORD PropertyRegDataType, OPTIONAL */
+                                                       pBuffer,          /* OUT PBYTE PropertyBuffer */
+                                                       cbBuffer,         /* IN DWORD PropertyBufferSize */
+                                                       &cbRequired       /* OUT PDWORD RequiredSize OPTIONAL */))
+                {
+                    winEr = GetLastError();
+                    NonStandardLogFlow(("VBoxNetCfgWinEnumNetDevices: SetupDiGetDeviceRegistryPropertyW (2) failed with %ld\n",
+                                        winEr));
+                    break;
+                }
+            }
+
+            PWSTR pCurId = (PWSTR)pBuffer;
+            size_t cCurId = wcslen(pCurId);
+
+            NonStandardLogFlow(("VBoxNetCfgWinEnumNetDevices: Device %ld: %S\n", dwDevId, pCurId));
+
+            if (cCurId >= cPnPId)
+            {
+                NonStandardLogFlow(("!wcsnicmp(pCurId = (%S), pwszPnPId = (%S), cPnPId = (%d))\n", pCurId, pwszPnPId, cPnPId));
+
+                pCurId += cCurId - cPnPId;
+                if (!wcsnicmp(pCurId, pwszPnPId, cPnPId))
+                {
+                    if (!pfnCallback(hDevInfo, &Dev, pvContext))
+                        break;
+                }
+            }
+        }
+
+        NonStandardLogFlow(("VBoxNetCfgWinEnumNetDevices: Found %ld devices total\n", dwDevId));
+
+        if (pBuffer)
+            free(pBuffer);
+
+        hr = HRESULT_FROM_WIN32(winEr);
+
+        SetupDiDestroyDeviceInfoList(hDevInfo);
+    }
+    else
+    {
+        DWORD winEr = GetLastError();
+        NonStandardLogFlow(("VBoxNetCfgWinEnumNetDevices: SetupDiGetClassDevsExW failed with %ld\n", winEr));
+        hr = HRESULT_FROM_WIN32(winEr);
+    }
+
+    NonStandardLogFlow(("VBoxNetCfgWinEnumNetDevices: Ended with hr (0x%x)\n", hr));
+    return hr;
+}
+
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinRemoveAllNetDevicesOfId(IN LPCWSTR lpszPnPId)
+{
+    return VBoxNetCfgWinEnumNetDevices(lpszPnPId, vboxNetCfgWinRemoveAllNetDevicesOfIdCallback, NULL);
+}
+
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinPropChangeAllNetDevicesOfId(IN LPCWSTR lpszPnPId, VBOXNECTFGWINPROPCHANGE_TYPE enmPcType)
+{
+    VBOXNECTFGWINPROPCHANGE Pc;
+    Pc.enmPcType = enmPcType;
+    Pc.hr = S_OK;
+    NonStandardLogFlow(("Calling VBoxNetCfgWinEnumNetDevices with lpszPnPId =(%S) and vboxNetCfgWinPropChangeAllNetDevicesOfIdCallback\n", lpszPnPId));
+
+    HRESULT hr = VBoxNetCfgWinEnumNetDevices(lpszPnPId, vboxNetCfgWinPropChangeAllNetDevicesOfIdCallback, &Pc);
+    if (!SUCCEEDED(hr))
+    {
+        NonStandardLogFlow(("VBoxNetCfgWinEnumNetDevices failed 0x%x\n", hr));
+        return hr;
+    }
+
+    if (!SUCCEEDED(Pc.hr))
+    {
+        NonStandardLogFlow(("vboxNetCfgWinPropChangeAllNetDevicesOfIdCallback failed 0x%x\n", Pc.hr));
+        return Pc.hr;
+    }
+
+    return S_OK;
+}
+
+/*
+ * logging
+ */
+static VOID DoLogging(LPCSTR szString, ...)
+{
+    LOG_ROUTINE pfnRoutine = (LOG_ROUTINE)(*((void * volatile *)&g_Logger));
+    if (pfnRoutine)
+    {
+        char szBuffer[4096] = {0};
+        va_list va;
+        va_start(va, szString);
+        _vsnprintf(szBuffer, RT_ELEMENTS(szBuffer), szString, va);
+        va_end(va);
+
+        pfnRoutine(szBuffer);
+    }
+}
+
+VBOXNETCFGWIN_DECL(VOID) VBoxNetCfgWinSetLogging(IN LOG_ROUTINE pfnLog)
+{
+    *((void * volatile *)&g_Logger) = pfnLog;
+}
+
+/*
+ * IP configuration API
+ */
+/* network settings config */
+/**
+ *  Strong referencing operators. Used as a second argument to ComPtr<>/ComObjPtr<>.
+ */
+template <class C>
+class ComStrongRef
+{
+protected:
+
+    static void addref (C *p) { p->AddRef(); }
+    static void release (C *p) { p->Release(); }
+};
+
+
+/**
+ *  Base template for smart COM pointers. Not intended to be used directly.
+ */
+template <class C, template <class> class RefOps = ComStrongRef>
+class ComPtrBase : protected RefOps <C>
+{
+public:
+
+    /* special template to disable AddRef()/Release() */
+    template <class I>
+    class NoAddRefRelease : public I
+    {
+        private:
+#if !defined (VBOX_WITH_XPCOM)
+            STDMETHOD_(ULONG, AddRef)() = 0;
+            STDMETHOD_(ULONG, Release)() = 0;
+#else /* !defined (VBOX_WITH_XPCOM) */
+            NS_IMETHOD_(nsrefcnt) AddRef(void) = 0;
+            NS_IMETHOD_(nsrefcnt) Release(void) = 0;
+#endif /* !defined (VBOX_WITH_XPCOM) */
+    };
+
+protected:
+
+    ComPtrBase () : p (NULL) {}
+    ComPtrBase (const ComPtrBase &that) : p (that.p) { addref(); }
+    ComPtrBase (C *that_p) : p (that_p) { addref(); }
+
+    ~ComPtrBase() { release(); }
+
+    ComPtrBase &operator= (const ComPtrBase &that)
+    {
+        safe_assign (that.p);
+        return *this;
+    }
+
+    ComPtrBase &operator= (C *that_p)
+    {
+        safe_assign (that_p);
+        return *this;
+    }
+
+public:
+
+    void setNull()
+    {
+        release();
+        p = NULL;
+    }
+
+    bool isNull() const
+    {
+        return (p == NULL);
+    }
+
+    bool operator! () const { return isNull(); }
+
+    bool operator< (C* that_p) const { return p < that_p; }
+    bool operator== (C* that_p) const { return p == that_p; }
+
+    template <class I>
+    bool equalsTo (I *aThat) const
+    {
+        return ComPtrEquals (p, aThat);
+    }
+
+    template <class OC>
+    bool equalsTo (const ComPtrBase <OC> &oc) const
+    {
+        return equalsTo ((OC *) oc);
+    }
+
+    /** Intended to pass instances as in parameters to interface methods */
+    operator C* () const { return p; }
+
+    /**
+     *  Dereferences the instance (redirects the -> operator to the managed
+     *  pointer).
+     */
+    NoAddRefRelease <C> *operator-> () const
+    {
+        AssertMsg (p, ("Managed pointer must not be null\n"));
+        return (NoAddRefRelease <C> *) p;
+    }
+
+    template <class I>
+    HRESULT queryInterfaceTo (I **pp) const
+    {
+        if (pp)
+        {
+            if (p)
+            {
+                return p->QueryInterface (COM_IIDOF (I), (void **) pp);
+            }
+            else
+            {
+                *pp = NULL;
+                return S_OK;
+            }
+        }
+
+        return E_INVALIDARG;
+    }
+
+    /** Intended to pass instances as out parameters to interface methods */
+    C **asOutParam()
+    {
+        setNull();
+        return &p;
+    }
+
+private:
+
+    void addref()
+    {
+        if (p)
+            RefOps <C>::addref (p);
+    }
+
+    void release()
+    {
+        if (p)
+            RefOps <C>::release (p);
+    }
+
+    void safe_assign (C *that_p)
+    {
+        /* be aware of self-assignment */
+        if (that_p)
+            RefOps <C>::addref (that_p);
+        release();
+        p = that_p;
+    }
+
+    C *p;
+};
+
+/**
+ *  Smart COM pointer wrapper that automatically manages refcounting of
+ *  interface pointers.
+ *
+ *  @param I    COM interface class
+ */
+template <class I, template <class> class RefOps = ComStrongRef>
+class ComPtr : public ComPtrBase <I, RefOps>
+{
+    typedef ComPtrBase <I, RefOps> Base;
+
+public:
+
+    ComPtr () : Base() {}
+    ComPtr (const ComPtr &that) : Base(that) {}
+    ComPtr &operator= (const ComPtr &that)
+    {
+        Base::operator= (that);
+        return *this;
+    }
+
+    template <class OI>
+    ComPtr (OI *that_p) : Base () { operator= (that_p); }
+
+    /* specialization for I */
+    ComPtr (I *that_p) : Base (that_p) {}
+
+    template <class OC>
+    ComPtr (const ComPtr <OC, RefOps> &oc) : Base () { operator= ((OC *) oc); }
+
+    template <class OI>
+    ComPtr &operator= (OI *that_p)
+    {
+        if (that_p)
+            that_p->QueryInterface (COM_IIDOF (I), (void **) Base::asOutParam());
+        else
+            Base::setNull();
+        return *this;
+    }
+
+    /* specialization for I */
+    ComPtr &operator=(I *that_p)
+    {
+        Base::operator= (that_p);
+        return *this;
+    }
+
+    template <class OC>
+    ComPtr &operator= (const ComPtr <OC, RefOps> &oc)
+    {
+        return operator= ((OC *) oc);
+    }
+};
+
+static HRESULT netIfWinFindAdapterClassById(IWbemServices * pSvc, const GUID * pGuid, IWbemClassObject **pAdapterConfig)
+{
+    HRESULT hr;
+    WCHAR wszQuery[256];
+    WCHAR wszGuid[50];
+
+    int length = StringFromGUID2(*pGuid, wszGuid, RT_ELEMENTS(wszGuid));
+    if (length)
+    {
+        swprintf(wszQuery, L"SELECT * FROM Win32_NetworkAdapterConfiguration WHERE SettingID = \"%s\"", wszGuid);
+        IEnumWbemClassObject* pEnumerator = NULL;
+        hr = pSvc->ExecQuery(bstr_t("WQL"), bstr_t(wszQuery), WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY,
+                             NULL, &pEnumerator);
+        if (SUCCEEDED(hr))
+        {
+            if (pEnumerator)
+            {
+                IWbemClassObject *pclsObj;
+                ULONG uReturn = 0;
+                hr = pEnumerator->Next(WBEM_INFINITE, 1, &pclsObj, &uReturn);
+                NonStandardLogFlow(("netIfWinFindAdapterClassById: IEnumWbemClassObject::Next -> hr=0x%x pclsObj=%p uReturn=%u 42=%u\n",
+                                    hr, (void *)pclsObj, uReturn, 42));
+                if (SUCCEEDED(hr))
+                {
+                    if (uReturn && pclsObj != NULL)
+                    {
+                        *pAdapterConfig = pclsObj;
+                        pEnumerator->Release();
+                        NonStandardLogFlow(("netIfWinFindAdapterClassById: S_OK and %p\n", *pAdapterConfig));
+                        return S_OK;
+                    }
+
+                    hr = E_FAIL;
+                }
+
+                pEnumerator->Release();
+            }
+            else
+            {
+                NonStandardLogFlow(("ExecQuery returned no enumerator\n"));
+                hr = E_FAIL;
+            }
+        }
+        else
+            NonStandardLogFlow(("ExecQuery failed (0x%x)\n", hr));
+    }
+    else
+    {
+        DWORD winEr = GetLastError();
+        hr = HRESULT_FROM_WIN32( winEr );
+        if (SUCCEEDED(hr))
+            hr = E_FAIL;
+        NonStandardLogFlow(("StringFromGUID2 failed winEr=%u, hr=0x%x\n", winEr, hr));
+    }
+
+    NonStandardLogFlow(("netIfWinFindAdapterClassById: 0x%x and %p\n", hr, *pAdapterConfig));
+    return hr;
+}
+
+static HRESULT netIfWinIsHostOnly(IWbemClassObject * pAdapterConfig, BOOL * pbIsHostOnly)
+{
+    VARIANT vtServiceName;
+    VariantInit(&vtServiceName);
+
+    HRESULT hr = pAdapterConfig->Get(L"ServiceName", 0 /*lFlags*/, &vtServiceName, NULL /*pvtType*/, NULL /*plFlavor*/);
+    if (SUCCEEDED(hr))
+    {
+        *pbIsHostOnly = bstr_t(vtServiceName.bstrVal) == bstr_t("VBoxNetAdp");
+
+        VariantClear(&vtServiceName);
+    }
+
+    return hr;
+}
+
+static HRESULT netIfWinGetIpSettings(IWbemClassObject * pAdapterConfig, ULONG *pIpv4, ULONG *pMaskv4)
+{
+    VARIANT vtIp;
+    HRESULT hr;
+    VariantInit(&vtIp);
+
+    *pIpv4 = 0;
+    *pMaskv4 = 0;
+
+    hr = pAdapterConfig->Get(L"IPAddress", 0, &vtIp, 0, 0);
+    if (SUCCEEDED(hr))
+    {
+        if (vtIp.vt == (VT_ARRAY | VT_BSTR))
+        {
+            VARIANT vtMask;
+            VariantInit(&vtMask);
+            hr = pAdapterConfig->Get(L"IPSubnet", 0, &vtMask, 0, 0);
+            if (SUCCEEDED(hr))
+            {
+                if (vtMask.vt == (VT_ARRAY | VT_BSTR))
+                {
+                    SAFEARRAY * pIpArray = vtIp.parray;
+                    SAFEARRAY * pMaskArray = vtMask.parray;
+                    if (pIpArray && pMaskArray)
+                    {
+                        BSTR pCurIp;
+                        BSTR pCurMask;
+                        for (LONG i = 0;
+                            SafeArrayGetElement(pIpArray, &i, (PVOID)&pCurIp) == S_OK
+                            && SafeArrayGetElement(pMaskArray, &i, (PVOID)&pCurMask) == S_OK;
+                            i++)
+                        {
+                            bstr_t ip(pCurIp);
+
+                            ULONG Ipv4 = inet_addr((char*)(ip));
+                            if (Ipv4 != INADDR_NONE)
+                            {
+                                *pIpv4 = Ipv4;
+                                bstr_t mask(pCurMask);
+                                *pMaskv4 = inet_addr((char*)(mask));
+                                break;
+                            }
+                        }
+                    }
+                }
+                else
+                {
+                    *pIpv4 = 0;
+                    *pMaskv4 = 0;
+                }
+
+                VariantClear(&vtMask);
+            }
+        }
+        else
+        {
+            *pIpv4 = 0;
+            *pMaskv4 = 0;
+        }
+
+        VariantClear(&vtIp);
+    }
+
+    return hr;
+}
+
+#if 0 /* unused */
+
+static HRESULT netIfWinHasIpSettings(IWbemClassObject * pAdapterConfig, SAFEARRAY * pCheckIp, SAFEARRAY * pCheckMask, bool *pFound)
+{
+    VARIANT vtIp;
+    HRESULT hr;
+    VariantInit(&vtIp);
+
+    *pFound = false;
+
+    hr = pAdapterConfig->Get(L"IPAddress", 0, &vtIp, 0, 0);
+    if (SUCCEEDED(hr))
+    {
+        VARIANT vtMask;
+        VariantInit(&vtMask);
+        hr = pAdapterConfig->Get(L"IPSubnet", 0, &vtMask, 0, 0);
+        if (SUCCEEDED(hr))
+        {
+            SAFEARRAY * pIpArray = vtIp.parray;
+            SAFEARRAY * pMaskArray = vtMask.parray;
+            if (pIpArray && pMaskArray)
+            {
+                BSTR pIp, pMask;
+                for (LONG k = 0;
+                    SafeArrayGetElement(pCheckIp, &k, (PVOID)&pIp) == S_OK
+                    && SafeArrayGetElement(pCheckMask, &k, (PVOID)&pMask) == S_OK;
+                    k++)
+                {
+                    BSTR pCurIp;
+                    BSTR pCurMask;
+                    for (LONG i = 0;
+                        SafeArrayGetElement(pIpArray, &i, (PVOID)&pCurIp) == S_OK
+                        && SafeArrayGetElement(pMaskArray, &i, (PVOID)&pCurMask) == S_OK;
+                        i++)
+                    {
+                        if (!wcsicmp(pCurIp, pIp))
+                        {
+                            if (!wcsicmp(pCurMask, pMask))
+                                *pFound = true;
+                            break;
+                        }
+                    }
+                }
+            }
+
+
+            VariantClear(&vtMask);
+        }
+
+        VariantClear(&vtIp);
+    }
+
+    return hr;
+}
+
+static HRESULT netIfWinWaitIpSettings(IWbemServices *pSvc, const GUID * pGuid, SAFEARRAY * pCheckIp, SAFEARRAY * pCheckMask, ULONG sec2Wait, bool *pFound)
+{
+    /* on Vista we need to wait for the address to get applied */
+    /* wait for the address to appear in the list */
+    HRESULT hr = S_OK;
+    ULONG i;
+    *pFound = false;
+    ComPtr <IWbemClassObject> pAdapterConfig;
+    for (i = 0;
+            (hr = netIfWinFindAdapterClassById(pSvc, pGuid, pAdapterConfig.asOutParam())) == S_OK
+         && (hr = netIfWinHasIpSettings(pAdapterConfig, pCheckIp, pCheckMask, pFound)) == S_OK
+         && !(*pFound)
+         && i < sec2Wait/6;
+         i++)
+    {
+        Sleep(6000);
+    }
+
+    return hr;
+}
+
+#endif /* unused */
+
+static HRESULT netIfWinCreateIWbemServices(IWbemServices ** ppSvc)
+{
+    IWbemLocator *pLoc = NULL;
+    HRESULT hr = CoCreateInstance(CLSID_WbemLocator, 0, CLSCTX_INPROC_SERVER, IID_IWbemLocator, (LPVOID *) &pLoc);
+    if (SUCCEEDED(hr))
+    {
+        IWbemServices *pSvc = NULL;
+        hr = pLoc->ConnectServer(bstr_t(L"ROOT\\CIMV2"), /* [in] const BSTR strNetworkResource */
+                NULL, /* [in] const BSTR strUser */
+                NULL, /* [in] const BSTR strPassword */
+                0,    /* [in] const BSTR strLocale */
+                NULL, /* [in] LONG lSecurityFlags */
+                0,    /* [in] const BSTR strAuthority */
+                0,    /* [in] IWbemContext* pCtx */
+                &pSvc /* [out] IWbemServices** ppNamespace */);
+        if (SUCCEEDED(hr))
+        {
+            hr = CoSetProxyBlanket(pSvc, /* IUnknown * pProxy */
+                    RPC_C_AUTHN_WINNT, /* DWORD dwAuthnSvc */
+                    RPC_C_AUTHZ_NONE, /* DWORD dwAuthzSvc */
+                    NULL, /* WCHAR * pServerPrincName */
+                    RPC_C_AUTHN_LEVEL_CALL, /* DWORD dwAuthnLevel */
+                    RPC_C_IMP_LEVEL_IMPERSONATE, /* DWORD dwImpLevel */
+                    NULL, /* RPC_AUTH_IDENTITY_HANDLE pAuthInfo */
+                    EOAC_NONE /* DWORD dwCapabilities */
+                    );
+            if (SUCCEEDED(hr))
+            {
+                *ppSvc = pSvc;
+                /* do not need it any more */
+                pLoc->Release();
+                return hr;
+            }
+            else
+                NonStandardLogFlow(("CoSetProxyBlanket failed, hr (0x%x)\n", hr));
+
+            pSvc->Release();
+        }
+        else
+            NonStandardLogFlow(("ConnectServer failed, hr (0x%x)\n", hr));
+        pLoc->Release();
+    }
+    else
+        NonStandardLogFlow(("CoCreateInstance failed, hr (0x%x)\n", hr));
+    return hr;
+}
+
+static HRESULT netIfWinAdapterConfigPath(IWbemClassObject *pObj, BSTR * pStr)
+{
+    VARIANT index;
+    HRESULT hr = pObj->Get(L"Index", 0, &index, 0, 0);
+    if (SUCCEEDED(hr))
+    {
+        WCHAR strIndex[8];
+        swprintf(strIndex, L"%u", index.uintVal);
+        *pStr = (bstr_t(L"Win32_NetworkAdapterConfiguration.Index='") + strIndex + "'").copy();
+    }
+    else
+        NonStandardLogFlow(("Get failed, hr (0x%x)\n", hr));
+    return hr;
+}
+
+static HRESULT netIfExecMethod(IWbemServices * pSvc, IWbemClassObject *pClass, BSTR ObjPath,
+        BSTR MethodName, LPWSTR *pArgNames, LPVARIANT *pArgs, UINT cArgs,
+        IWbemClassObject** ppOutParams
+        )
+{
+    HRESULT hr = S_OK;
+    ComPtr<IWbemClassObject> pInParamsDefinition;
+    ComPtr<IWbemClassObject> pClassInstance;
+
+    if (cArgs)
+    {
+        hr = pClass->GetMethod(MethodName, 0, pInParamsDefinition.asOutParam(), NULL);
+        if (SUCCEEDED(hr))
+        {
+            hr = pInParamsDefinition->SpawnInstance(0, pClassInstance.asOutParam());
+            if (SUCCEEDED(hr))
+            {
+                for (UINT i = 0; i < cArgs; i++)
+                {
+                    hr = pClassInstance->Put(pArgNames[i], 0,
+                        pArgs[i], 0);
+                    if (FAILED(hr))
+                        break;
+                }
+            }
+        }
+    }
+
+    if (SUCCEEDED(hr))
+    {
+        IWbemClassObject* pOutParams = NULL;
+        hr = pSvc->ExecMethod(ObjPath, MethodName, 0, NULL, pClassInstance, &pOutParams, NULL);
+        if (SUCCEEDED(hr))
+        {
+            *ppOutParams = pOutParams;
+        }
+    }
+
+    return hr;
+}
+
+static HRESULT netIfWinCreateIpArray(SAFEARRAY **ppArray, in_addr* aIp, UINT cIp)
+{
+    HRESULT hr = S_OK; /* MSC maybe used uninitialized */
+    SAFEARRAY * pIpArray = SafeArrayCreateVector(VT_BSTR, 0, cIp);
+    if (pIpArray)
+    {
+        for (UINT i = 0; i < cIp; i++)
+        {
+            char* addr = inet_ntoa(aIp[i]);
+            BSTR val = bstr_t(addr).copy();
+            long aIndex[1];
+            aIndex[0] = i;
+            hr = SafeArrayPutElement(pIpArray, aIndex, val);
+            if (FAILED(hr))
+            {
+                SysFreeString(val);
+                SafeArrayDestroy(pIpArray);
+                break;
+            }
+        }
+
+        if (SUCCEEDED(hr))
+        {
+            *ppArray = pIpArray;
+        }
+    }
+    else
+        hr = HRESULT_FROM_WIN32(GetLastError());
+
+    return hr;
+}
+
+#if 0 /* unused */
+static HRESULT netIfWinCreateIpArrayV4V6(SAFEARRAY **ppArray, BSTR Ip)
+{
+    HRESULT hr;
+    SAFEARRAY *pIpArray = SafeArrayCreateVector(VT_BSTR, 0, 1);
+    if (pIpArray)
+    {
+        BSTR val = bstr_t(Ip, false).copy();
+        long aIndex[1];
+        aIndex[0] = 0;
+        hr = SafeArrayPutElement(pIpArray, aIndex, val);
+        if (FAILED(hr))
+        {
+            SysFreeString(val);
+            SafeArrayDestroy(pIpArray);
+        }
+
+        if (SUCCEEDED(hr))
+        {
+            *ppArray = pIpArray;
+        }
+    }
+    else
+        hr = HRESULT_FROM_WIN32(GetLastError());
+
+    return hr;
+}
+#endif
+
+
+static HRESULT netIfWinCreateIpArrayVariantV4(VARIANT * pIpAddresses, in_addr* aIp, UINT cIp)
+{
+    HRESULT hr;
+    VariantInit(pIpAddresses);
+    pIpAddresses->vt = VT_ARRAY | VT_BSTR;
+    SAFEARRAY *pIpArray;
+    hr = netIfWinCreateIpArray(&pIpArray, aIp, cIp);
+    if (SUCCEEDED(hr))
+    {
+        pIpAddresses->parray = pIpArray;
+    }
+    return hr;
+}
+
+#if 0 /* unused */
+static HRESULT netIfWinCreateIpArrayVariantV4V6(VARIANT * pIpAddresses, BSTR Ip)
+{
+    HRESULT hr;
+    VariantInit(pIpAddresses);
+    pIpAddresses->vt = VT_ARRAY | VT_BSTR;
+    SAFEARRAY *pIpArray;
+    hr = netIfWinCreateIpArrayV4V6(&pIpArray, Ip);
+    if (SUCCEEDED(hr))
+    {
+        pIpAddresses->parray = pIpArray;
+    }
+    return hr;
+}
+#endif
+
+static HRESULT netIfWinEnableStatic(IWbemServices *pSvc, const GUID *pGuid, BSTR ObjPath, VARIANT *pIp, VARIANT *pMask)
+{
+    ComPtr<IWbemClassObject> pClass;
+    BSTR ClassName = SysAllocString(L"Win32_NetworkAdapterConfiguration");
+    HRESULT hr;
+    if (ClassName)
+    {
+        hr = pSvc->GetObject(ClassName, 0, NULL, pClass.asOutParam(), NULL);
+        if (SUCCEEDED(hr))
+        {
+            LPWSTR argNames[] = {L"IPAddress", L"SubnetMask"};
+            LPVARIANT args[] = {pIp, pMask};
+            ComPtr<IWbemClassObject> pOutParams;
+
+            hr = netIfExecMethod(pSvc, pClass, ObjPath, bstr_t(L"EnableStatic"), argNames, args, 2, pOutParams.asOutParam());
+            if (SUCCEEDED(hr))
+            {
+                VARIANT varReturnValue;
+                hr = pOutParams->Get(bstr_t(L"ReturnValue"), 0,
+                    &varReturnValue, NULL, 0);
+                Assert(SUCCEEDED(hr));
+                if (SUCCEEDED(hr))
+                {
+//                    Assert(varReturnValue.vt == VT_UINT);
+                    int winEr = varReturnValue.uintVal;
+                    switch (winEr)
+                    {
+                        case 0:
+                        {
+                            hr = S_OK;
+//                            bool bFound;
+//                            HRESULT tmpHr = netIfWinWaitIpSettings(pSvc, pGuid, pIp->parray, pMask->parray, 180, &bFound);
+                            NOREF(pGuid);
+                            break;
+                        }
+                        default:
+                            hr = HRESULT_FROM_WIN32( winEr );
+                            break;
+                    }
+                }
+            }
+        }
+        SysFreeString(ClassName);
+    }
+    else
+        hr = HRESULT_FROM_WIN32(GetLastError());
+
+    return hr;
+}
+
+
+static HRESULT netIfWinEnableStaticV4(IWbemServices * pSvc, const GUID * pGuid, BSTR ObjPath, in_addr* aIp, in_addr * aMask, UINT cIp)
+{
+    VARIANT ipAddresses;
+    HRESULT hr = netIfWinCreateIpArrayVariantV4(&ipAddresses, aIp, cIp);
+    if (SUCCEEDED(hr))
+    {
+        VARIANT ipMasks;
+        hr = netIfWinCreateIpArrayVariantV4(&ipMasks, aMask, cIp);
+        if (SUCCEEDED(hr))
+        {
+            hr = netIfWinEnableStatic(pSvc, pGuid, ObjPath, &ipAddresses, &ipMasks);
+            VariantClear(&ipMasks);
+        }
+        VariantClear(&ipAddresses);
+    }
+    return hr;
+}
+
+#if 0 /* unused */
+
+static HRESULT netIfWinEnableStaticV4V6(IWbemServices * pSvc, const GUID * pGuid, BSTR ObjPath, BSTR Ip, BSTR Mask)
+{
+    VARIANT ipAddresses;
+    HRESULT hr = netIfWinCreateIpArrayVariantV4V6(&ipAddresses, Ip);
+    if (SUCCEEDED(hr))
+    {
+        VARIANT ipMasks;
+        hr = netIfWinCreateIpArrayVariantV4V6(&ipMasks, Mask);
+        if (SUCCEEDED(hr))
+        {
+            hr = netIfWinEnableStatic(pSvc, pGuid, ObjPath, &ipAddresses, &ipMasks);
+            VariantClear(&ipMasks);
+        }
+        VariantClear(&ipAddresses);
+    }
+    return hr;
+}
+
+/* win API allows to set gw metrics as well, we are not setting them */
+static HRESULT netIfWinSetGateways(IWbemServices * pSvc, BSTR ObjPath, VARIANT * pGw)
+{
+    ComPtr<IWbemClassObject> pClass;
+    BSTR ClassName = SysAllocString(L"Win32_NetworkAdapterConfiguration");
+    HRESULT hr;
+    if (ClassName)
+    {
+        hr = pSvc->GetObject(ClassName, 0, NULL, pClass.asOutParam(), NULL);
+        if (SUCCEEDED(hr))
+        {
+            LPWSTR argNames[] = {L"DefaultIPGateway"};
+            LPVARIANT args[] = {pGw};
+            ComPtr<IWbemClassObject> pOutParams;
+
+            hr = netIfExecMethod(pSvc, pClass, ObjPath, bstr_t(L"SetGateways"), argNames, args, 1, pOutParams.asOutParam());
+            if (SUCCEEDED(hr))
+            {
+                VARIANT varReturnValue;
+                hr = pOutParams->Get(bstr_t(L"ReturnValue"), 0, &varReturnValue, NULL, 0);
+                Assert(SUCCEEDED(hr));
+                if (SUCCEEDED(hr))
+                {
+//                    Assert(varReturnValue.vt == VT_UINT);
+                    int winEr = varReturnValue.uintVal;
+                    switch (winEr)
+                    {
+                    case 0:
+                        hr = S_OK;
+                        break;
+                    default:
+                        hr = HRESULT_FROM_WIN32( winEr );
+                        break;
+                    }
+                }
+            }
+        }
+        SysFreeString(ClassName);
+    }
+    else
+        hr = HRESULT_FROM_WIN32(GetLastError());
+
+    return hr;
+}
+
+/* win API allows to set gw metrics as well, we are not setting them */
+static HRESULT netIfWinSetGatewaysV4(IWbemServices * pSvc, BSTR ObjPath, in_addr* aGw, UINT cGw)
+{
+    VARIANT gwais;
+    HRESULT hr = netIfWinCreateIpArrayVariantV4(&gwais, aGw, cGw);
+    if (SUCCEEDED(hr))
+    {
+        netIfWinSetGateways(pSvc, ObjPath, &gwais);
+        VariantClear(&gwais);
+    }
+    return hr;
+}
+
+/* win API allows to set gw metrics as well, we are not setting them */
+static HRESULT netIfWinSetGatewaysV4V6(IWbemServices * pSvc, BSTR ObjPath, BSTR Gw)
+{
+    VARIANT vGw;
+    HRESULT hr = netIfWinCreateIpArrayVariantV4V6(&vGw, Gw);
+    if (SUCCEEDED(hr))
+    {
+        netIfWinSetGateways(pSvc, ObjPath, &vGw);
+        VariantClear(&vGw);
+    }
+    return hr;
+}
+
+#endif /* unused */
+
+static HRESULT netIfWinEnableDHCP(IWbemServices * pSvc, BSTR ObjPath)
+{
+    ComPtr<IWbemClassObject> pClass;
+    BSTR ClassName = SysAllocString(L"Win32_NetworkAdapterConfiguration");
+    HRESULT hr;
+    if (ClassName)
+    {
+        hr = pSvc->GetObject(ClassName, 0, NULL, pClass.asOutParam(), NULL);
+        if (SUCCEEDED(hr))
+        {
+            ComPtr<IWbemClassObject> pOutParams;
+
+            hr = netIfExecMethod(pSvc, pClass, ObjPath, bstr_t(L"EnableDHCP"), NULL, NULL, 0, pOutParams.asOutParam());
+            if (SUCCEEDED(hr))
+            {
+                VARIANT varReturnValue;
+                hr = pOutParams->Get(bstr_t(L"ReturnValue"), 0,
+                    &varReturnValue, NULL, 0);
+                Assert(SUCCEEDED(hr));
+                if (SUCCEEDED(hr))
+                {
+//                    Assert(varReturnValue.vt == VT_UINT);
+                    int winEr = varReturnValue.uintVal;
+                    switch (winEr)
+                    {
+                    case 0:
+                        hr = S_OK;
+                        break;
+                    default:
+                        hr = HRESULT_FROM_WIN32( winEr );
+                        break;
+                    }
+                }
+            }
+        }
+        SysFreeString(ClassName);
+    }
+    else
+        hr = HRESULT_FROM_WIN32(GetLastError());
+
+    return hr;
+}
+
+static HRESULT netIfWinDhcpRediscover(IWbemServices * pSvc, BSTR ObjPath)
+{
+    ComPtr<IWbemClassObject> pClass;
+    BSTR ClassName = SysAllocString(L"Win32_NetworkAdapterConfiguration");
+    HRESULT hr;
+    if (ClassName)
+    {
+        hr = pSvc->GetObject(ClassName, 0, NULL, pClass.asOutParam(), NULL);
+        if (SUCCEEDED(hr))
+        {
+            ComPtr<IWbemClassObject> pOutParams;
+
+            hr = netIfExecMethod(pSvc, pClass, ObjPath, bstr_t(L"ReleaseDHCPLease"), NULL, NULL, 0, pOutParams.asOutParam());
+            if (SUCCEEDED(hr))
+            {
+                VARIANT varReturnValue;
+                hr = pOutParams->Get(bstr_t(L"ReturnValue"), 0, &varReturnValue, NULL, 0);
+                Assert(SUCCEEDED(hr));
+                if (SUCCEEDED(hr))
+                {
+//                    Assert(varReturnValue.vt == VT_UINT);
+                    int winEr = varReturnValue.uintVal;
+                    if (winEr == 0)
+                    {
+                        hr = netIfExecMethod(pSvc, pClass, ObjPath, bstr_t(L"RenewDHCPLease"), NULL, NULL, 0, pOutParams.asOutParam());
+                        if (SUCCEEDED(hr))
+                        {
+                            VARIANT varReturnValue;
+                            hr = pOutParams->Get(bstr_t(L"ReturnValue"), 0, &varReturnValue, NULL, 0);
+                            Assert(SUCCEEDED(hr));
+                            if (SUCCEEDED(hr))
+                            {
+            //                    Assert(varReturnValue.vt == VT_UINT);
+                                int winEr = varReturnValue.uintVal;
+                                if (winEr == 0)
+                                    hr = S_OK;
+                                else
+                                    hr = HRESULT_FROM_WIN32( winEr );
+                            }
+                        }
+                    }
+                    else
+                        hr = HRESULT_FROM_WIN32( winEr );
+                }
+            }
+        }
+        SysFreeString(ClassName);
+    }
+    else
+        hr = HRESULT_FROM_WIN32(GetLastError());
+
+    return hr;
+}
+
+static HRESULT vboxNetCfgWinIsDhcpEnabled(IWbemClassObject * pAdapterConfig, BOOL *pEnabled)
+{
+    VARIANT vtEnabled;
+    HRESULT hr = pAdapterConfig->Get(L"DHCPEnabled", 0, &vtEnabled, 0, 0);
+    if (SUCCEEDED(hr))
+        *pEnabled = vtEnabled.boolVal;
+    return hr;
+}
+
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinGetAdapterSettings(IN const GUID * pGuid, OUT PADAPTER_SETTINGS pSettings)
+{
+    HRESULT hr;
+    ComPtr <IWbemServices> pSvc;
+    hr = netIfWinCreateIWbemServices(pSvc.asOutParam());
+    if (SUCCEEDED(hr))
+    {
+        ComPtr<IWbemClassObject> pAdapterConfig;
+        hr = netIfWinFindAdapterClassById(pSvc, pGuid, pAdapterConfig.asOutParam());
+        if (SUCCEEDED(hr))
+        {
+            hr = vboxNetCfgWinIsDhcpEnabled(pAdapterConfig, &pSettings->bDhcp);
+            if (SUCCEEDED(hr))
+                hr = netIfWinGetIpSettings(pAdapterConfig, &pSettings->ip, &pSettings->mask);
+        }
+    }
+
+    return hr;
+}
+
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinIsDhcpEnabled(const GUID * pGuid, BOOL *pEnabled)
+{
+    HRESULT hr;
+    ComPtr <IWbemServices> pSvc;
+    hr = netIfWinCreateIWbemServices(pSvc.asOutParam());
+    if (SUCCEEDED(hr))
+    {
+        ComPtr<IWbemClassObject> pAdapterConfig;
+        hr = netIfWinFindAdapterClassById(pSvc, pGuid, pAdapterConfig.asOutParam());
+        if (SUCCEEDED(hr))
+        {
+            VARIANT vtEnabled;
+            hr = pAdapterConfig->Get(L"DHCPEnabled", 0, &vtEnabled, 0, 0);
+            if (SUCCEEDED(hr))
+                *pEnabled = vtEnabled.boolVal;
+        }
+    }
+
+    return hr;
+}
+
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinEnableStaticIpConfig(IN const GUID *pGuid, IN ULONG ip, IN ULONG mask)
+{
+    NonStandardLogFlow(("VBoxNetCfgWinEnableStaticIpConfig: ip=0x%x mask=0x%x\n", ip, mask));
+    ComPtr<IWbemServices> pSvc;
+    HRESULT hr = netIfWinCreateIWbemServices(pSvc.asOutParam());
+    if (SUCCEEDED(hr))
+    {
+        ComPtr<IWbemClassObject> pAdapterConfig;
+        hr = netIfWinFindAdapterClassById(pSvc, pGuid, pAdapterConfig.asOutParam());
+        if (SUCCEEDED(hr))
+        {
+            BOOL bIsHostOnly;
+            hr = netIfWinIsHostOnly(pAdapterConfig, &bIsHostOnly);
+            if (SUCCEEDED(hr))
+            {
+                if (bIsHostOnly)
+                {
+                    in_addr aIp[1];
+                    in_addr aMask[1];
+                    aIp[0].S_un.S_addr = ip;
+                    aMask[0].S_un.S_addr = mask;
+
+                    BSTR ObjPath;
+                    hr = netIfWinAdapterConfigPath(pAdapterConfig, &ObjPath);
+                    if (SUCCEEDED(hr))
+                    {
+                        hr = netIfWinEnableStaticV4(pSvc, pGuid, ObjPath, aIp, aMask, ip != 0 ? 1 : 0);
+                        if (SUCCEEDED(hr))
+                        {
+#if 0
+                            in_addr aGw[1];
+                            aGw[0].S_un.S_addr = gw;
+                            hr = netIfWinSetGatewaysV4(pSvc, ObjPath, aGw, 1);
+                            if (SUCCEEDED(hr))
+#endif
+                            {
+                            }
+                        }
+                        SysFreeString(ObjPath);
+                    }
+                }
+                else
+                {
+                    hr = E_FAIL;
+                }
+            }
+        }
+    }
+
+    NonStandardLogFlow(("VBoxNetCfgWinEnableStaticIpConfig: returns 0x%x\n", hr));
+    return hr;
+}
+
+#if 0
+static HRESULT netIfEnableStaticIpConfigV6(const GUID *pGuid, IN_BSTR aIPV6Address, IN_BSTR aIPV6Mask, IN_BSTR aIPV6DefaultGateway)
+{
+    HRESULT hr;
+        ComPtr <IWbemServices> pSvc;
+        hr = netIfWinCreateIWbemServices(pSvc.asOutParam());
+        if (SUCCEEDED(hr))
+        {
+            ComPtr<IWbemClassObject> pAdapterConfig;
+            hr = netIfWinFindAdapterClassById(pSvc, pGuid, pAdapterConfig.asOutParam());
+            if (SUCCEEDED(hr))
+            {
+                BSTR ObjPath;
+                hr = netIfWinAdapterConfigPath(pAdapterConfig, &ObjPath);
+                if (SUCCEEDED(hr))
+                {
+                    hr = netIfWinEnableStaticV4V6(pSvc, pAdapterConfig, ObjPath, aIPV6Address, aIPV6Mask);
+                    if (SUCCEEDED(hr))
+                    {
+                        if (aIPV6DefaultGateway)
+                        {
+                            hr = netIfWinSetGatewaysV4V6(pSvc, ObjPath, aIPV6DefaultGateway);
+                        }
+                        if (SUCCEEDED(hr))
+                        {
+//                            hr = netIfWinUpdateConfig(pIf);
+                        }
+                    }
+                    SysFreeString(ObjPath);
+                }
+            }
+        }
+
+    return SUCCEEDED(hr) ? VINF_SUCCESS : VERR_GENERAL_FAILURE;
+}
+
+static HRESULT netIfEnableStaticIpConfigV6(const GUID *pGuid, IN_BSTR aIPV6Address, ULONG aIPV6MaskPrefixLength)
+{
+    RTNETADDRIPV6 Mask;
+    int rc = RTNetPrefixToMaskIPv6(aIPV6MaskPrefixLength, &Mask);
+    if (RT_SUCCESS(rc))
+    {
+        Bstr maskStr = composeIPv6Address(&Mask);
+        rc = netIfEnableStaticIpConfigV6(pGuid, aIPV6Address, maskStr, NULL);
+    }
+    return rc;
+}
+#endif
+
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinEnableDynamicIpConfig(IN const GUID *pGuid)
+{
+    HRESULT hr;
+        ComPtr <IWbemServices> pSvc;
+        hr = netIfWinCreateIWbemServices(pSvc.asOutParam());
+        if (SUCCEEDED(hr))
+        {
+            ComPtr<IWbemClassObject> pAdapterConfig;
+            hr = netIfWinFindAdapterClassById(pSvc, pGuid, pAdapterConfig.asOutParam());
+            if (SUCCEEDED(hr))
+            {
+                BOOL bIsHostOnly;
+                hr = netIfWinIsHostOnly(pAdapterConfig, &bIsHostOnly);
+                if (SUCCEEDED(hr))
+                {
+                    if (bIsHostOnly)
+                    {
+                        BSTR ObjPath;
+                        hr = netIfWinAdapterConfigPath(pAdapterConfig, &ObjPath);
+                        if (SUCCEEDED(hr))
+                        {
+                            hr = netIfWinEnableDHCP(pSvc, ObjPath);
+                            if (SUCCEEDED(hr))
+                            {
+//                              hr = netIfWinUpdateConfig(pIf);
+                            }
+                            SysFreeString(ObjPath);
+                        }
+                    }
+                    else
+                    {
+                        hr = E_FAIL;
+                    }
+                }
+            }
+        }
+
+
+    return hr;
+}
+
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinDhcpRediscover(IN const GUID *pGuid)
+{
+    HRESULT hr;
+    ComPtr <IWbemServices> pSvc;
+    hr = netIfWinCreateIWbemServices(pSvc.asOutParam());
+    if (SUCCEEDED(hr))
+    {
+        ComPtr<IWbemClassObject> pAdapterConfig;
+        hr = netIfWinFindAdapterClassById(pSvc, pGuid, pAdapterConfig.asOutParam());
+        if (SUCCEEDED(hr))
+        {
+            BOOL bIsHostOnly;
+            hr = netIfWinIsHostOnly(pAdapterConfig, &bIsHostOnly);
+            if (SUCCEEDED(hr))
+            {
+                if (bIsHostOnly)
+                {
+                    BSTR ObjPath;
+                    hr = netIfWinAdapterConfigPath(pAdapterConfig, &ObjPath);
+                    if (SUCCEEDED(hr))
+                    {
+                        hr = netIfWinDhcpRediscover(pSvc, ObjPath);
+                        if (SUCCEEDED(hr))
+                        {
+                            //hr = netIfWinUpdateConfig(pIf);
+                        }
+                        SysFreeString(ObjPath);
+                    }
+                }
+                else
+                {
+                    hr = E_FAIL;
+                }
+            }
+        }
+    }
+
+
+    return hr;
+}
+
+static const char *vboxNetCfgWinAddrToStr(char *pszBuf, LPSOCKADDR pAddr)
+{
+    switch (pAddr->sa_family)
+    {
+        case AF_INET:
+            sprintf(pszBuf, "%d.%d.%d.%d",
+                    ((PSOCKADDR_IN)pAddr)->sin_addr.S_un.S_un_b.s_b1,
+                    ((PSOCKADDR_IN)pAddr)->sin_addr.S_un.S_un_b.s_b2,
+                    ((PSOCKADDR_IN)pAddr)->sin_addr.S_un.S_un_b.s_b3,
+                    ((PSOCKADDR_IN)pAddr)->sin_addr.S_un.S_un_b.s_b4);
+            break;
+        case AF_INET6:
+            sprintf(pszBuf, "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x",
+                 ((PSOCKADDR_IN6)pAddr)->sin6_addr.s6_addr[0], ((PSOCKADDR_IN6)pAddr)->sin6_addr.s6_addr[1],
+                 ((PSOCKADDR_IN6)pAddr)->sin6_addr.s6_addr[2], ((PSOCKADDR_IN6)pAddr)->sin6_addr.s6_addr[3],
+                 ((PSOCKADDR_IN6)pAddr)->sin6_addr.s6_addr[4], ((PSOCKADDR_IN6)pAddr)->sin6_addr.s6_addr[5],
+                 ((PSOCKADDR_IN6)pAddr)->sin6_addr.s6_addr[6], ((PSOCKADDR_IN6)pAddr)->sin6_addr.s6_addr[7],
+                 ((PSOCKADDR_IN6)pAddr)->sin6_addr.s6_addr[8], ((PSOCKADDR_IN6)pAddr)->sin6_addr.s6_addr[9],
+                 ((PSOCKADDR_IN6)pAddr)->sin6_addr.s6_addr[10], ((PSOCKADDR_IN6)pAddr)->sin6_addr.s6_addr[11],
+                 ((PSOCKADDR_IN6)pAddr)->sin6_addr.s6_addr[12], ((PSOCKADDR_IN6)pAddr)->sin6_addr.s6_addr[13],
+                 ((PSOCKADDR_IN6)pAddr)->sin6_addr.s6_addr[14], ((PSOCKADDR_IN6)pAddr)->sin6_addr.s6_addr[15]);
+            break;
+        default:
+            strcpy(pszBuf, "unknown");
+            break;
+    }
+    return pszBuf;
+}
+
+typedef bool (*PFNVBOXNETCFG_IPSETTINGS_CALLBACK) (ULONG ip, ULONG mask, PVOID pContext);
+
+static void vboxNetCfgWinEnumIpConfig(PIP_ADAPTER_ADDRESSES pAddresses, PFNVBOXNETCFG_IPSETTINGS_CALLBACK pfnCallback, PVOID pContext)
+{
+    PIP_ADAPTER_ADDRESSES pAdapter;
+    for (pAdapter = pAddresses; pAdapter; pAdapter = pAdapter->Next)
+    {
+        char szBuf[80];
+
+        NonStandardLogFlow(("+- Enumerating adapter '%ls' %s\n", pAdapter->FriendlyName, pAdapter->AdapterName));
+        for (PIP_ADAPTER_PREFIX pPrefix = pAdapter->FirstPrefix; pPrefix; pPrefix = pPrefix->Next)
+        {
+            const char *pcszAddress = vboxNetCfgWinAddrToStr(szBuf, pPrefix->Address.lpSockaddr);
+            /* We are concerned with IPv4 only, ignore the rest. */
+            if (pPrefix->Address.lpSockaddr->sa_family != AF_INET)
+            {
+                NonStandardLogFlow(("| +- %s %d: not IPv4, ignoring\n", pcszAddress, pPrefix->PrefixLength));
+                continue;
+            }
+            /* Ignore invalid prefixes as well as host addresses. */
+            if (pPrefix->PrefixLength < 1 || pPrefix->PrefixLength > 31)
+            {
+                NonStandardLogFlow(("| +- %s %d: host or broadcast, ignoring\n", pcszAddress, pPrefix->PrefixLength));
+                continue;
+            }
+            /* Ignore multicast and beyond. */
+            ULONG ip = ((struct sockaddr_in *)pPrefix->Address.lpSockaddr)->sin_addr.s_addr;
+            if ((ip & 0xF0) > 224)
+            {
+                NonStandardLogFlow(("| +- %s %d: multicast, ignoring\n", pcszAddress, pPrefix->PrefixLength));
+                continue;
+            }
+            ULONG mask = htonl((~(((ULONG)~0) >> pPrefix->PrefixLength)));
+            bool fContinue = pfnCallback(ip, mask, pContext);
+            if (!fContinue)
+            {
+                NonStandardLogFlow(("| +- %s %d: CONFLICT!\n", pcszAddress, pPrefix->PrefixLength));
+                return;
+            }
+            else
+                NonStandardLogFlow(("| +- %s %d: no conflict, moving on\n", pcszAddress, pPrefix->PrefixLength));
+        }
+    }
+}
+
+typedef struct _IPPROBE_CONTEXT
+{
+    ULONG Prefix;
+    bool bConflict;
+}IPPROBE_CONTEXT, *PIPPROBE_CONTEXT;
+
+#define IPPROBE_INIT(_pContext, _addr) \
+    ((_pContext)->bConflict = false, \
+     (_pContext)->Prefix = _addr)
+
+#define IPPROBE_INIT_STR(_pContext, _straddr) \
+    IPROBE_INIT(_pContext, inet_addr(_straddr))
+
+static bool vboxNetCfgWinIpProbeCallback (ULONG ip, ULONG mask, PVOID pContext)
+{
+    PIPPROBE_CONTEXT pProbe = (PIPPROBE_CONTEXT)pContext;
+
+    if ((ip & mask) == (pProbe->Prefix & mask))
+    {
+        pProbe->bConflict = true;
+        return false;
+    }
+
+    return true;
+}
+
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinGenHostOnlyNetworkNetworkIp(OUT PULONG pNetIp, OUT PULONG pNetMask)
+{
+    DWORD dwRc;
+    HRESULT hr = S_OK;
+    /*
+     * MSDN recommends to pre-allocate a 15KB buffer.
+     */
+    ULONG uBufLen = 15 * 1024;
+    PIP_ADAPTER_ADDRESSES pAddresses = (PIP_ADAPTER_ADDRESSES)malloc(uBufLen);
+    if (!pAddresses)
+        return HRESULT_FROM_WIN32(ERROR_NOT_ENOUGH_MEMORY);
+    dwRc = GetAdaptersAddresses(AF_UNSPEC, GAA_FLAG_INCLUDE_PREFIX, NULL, pAddresses, &uBufLen);
+    if (dwRc == ERROR_BUFFER_OVERFLOW)
+    {
+        /* Impressive! More than 10 adapters! Get more memory and try again. */
+        free(pAddresses);
+        pAddresses = (PIP_ADAPTER_ADDRESSES)malloc(uBufLen);
+        if (!pAddresses)
+            return HRESULT_FROM_WIN32(ERROR_NOT_ENOUGH_MEMORY);
+        dwRc = GetAdaptersAddresses(AF_UNSPEC, GAA_FLAG_INCLUDE_PREFIX, NULL, pAddresses, &uBufLen);
+    }
+    if (dwRc == NO_ERROR)
+    {
+        IPPROBE_CONTEXT Context;
+        const ULONG ip192168 = inet_addr("192.168.0.0");
+        srand(GetTickCount());
+
+        *pNetIp = 0;
+        *pNetMask = 0;
+
+        for (int i = 0; i < 255; i++)
+        {
+            ULONG ipProbe = rand()*255/RAND_MAX;
+            ipProbe = ip192168 | (ipProbe << 16);
+            unsigned char *a = (unsigned char *)&ipProbe;
+            NonStandardLogFlow(("probing %d.%d.%d.%d\n", a[0], a[1], a[2], a[3]));
+            IPPROBE_INIT(&Context, ipProbe);
+            vboxNetCfgWinEnumIpConfig(pAddresses, vboxNetCfgWinIpProbeCallback, &Context);
+            if (!Context.bConflict)
+            {
+                NonStandardLogFlow(("found unused net %d.%d.%d.%d\n", a[0], a[1], a[2], a[3]));
+                *pNetIp = ipProbe;
+                *pNetMask = inet_addr("255.255.255.0");
+                break;
+            }
+        }
+        if (*pNetIp == 0)
+            dwRc = ERROR_DHCP_ADDRESS_CONFLICT;
+    }
+    else
+        NonStandardLogFlow(("GetAdaptersAddresses err (%d)\n", dwRc));
+
+    if (pAddresses)
+        free(pAddresses);
+
+    if (dwRc != NO_ERROR)
+    {
+        hr = HRESULT_FROM_WIN32(dwRc);
+    }
+
+    return hr;
+}
+
+/*
+ * convenience functions to perform netflt/adp manipulations
+ */
+#define VBOXNETCFGWIN_NETFLT_ID    L"sun_VBoxNetFlt"
+#define VBOXNETCFGWIN_NETFLT_MP_ID L"sun_VBoxNetFltmp"
+
+static HRESULT vboxNetCfgWinNetFltUninstall(IN INetCfg *pNc, DWORD InfRmFlags)
+{
+    INetCfgComponent *pNcc = NULL;
+    HRESULT hr = pNc->FindComponent(VBOXNETCFGWIN_NETFLT_ID, &pNcc);
+    if (hr == S_OK)
+    {
+        NonStandardLog("NetFlt is installed currently, uninstalling ...\n");
+
+        hr = VBoxNetCfgWinUninstallComponent(pNc, pNcc);
+        NonStandardLogFlow(("NetFlt component uninstallation ended with hr (0x%x)\n", hr));
+
+        pNcc->Release();
+    }
+    else if (hr == S_FALSE)
+    {
+        NonStandardLog("NetFlt is not installed currently\n");
+    }
+    else
+    {
+        NonStandardLogFlow(("FindComponent failed, hr (0x%x)\n", hr));
+    }
+
+    VBoxDrvCfgInfUninstallAllF(L"NetService", VBOXNETCFGWIN_NETFLT_ID, InfRmFlags);
+    VBoxDrvCfgInfUninstallAllF(L"Net", VBOXNETCFGWIN_NETFLT_MP_ID, InfRmFlags);
+
+    return hr;
+}
+
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinNetFltUninstall(IN INetCfg *pNc)
+{
+    return vboxNetCfgWinNetFltUninstall(pNc, 0);
+}
+
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinNetFltInstall(IN INetCfg *pNc,
+                                                       IN LPCWSTR const *apInfFullPaths, IN UINT cInfFullPaths)
+{
+    HRESULT hr = vboxNetCfgWinNetFltUninstall(pNc, SUOI_FORCEDELETE);
+    if (SUCCEEDED(hr))
+    {
+        NonStandardLog("NetFlt will be installed ...\n");
+        hr = vboxNetCfgWinInstallInfAndComponent(pNc, VBOXNETCFGWIN_NETFLT_ID,
+                                                 &GUID_DEVCLASS_NETSERVICE,
+                                                 apInfFullPaths,
+                                                 cInfFullPaths,
+                                                 NULL);
+    }
+    return hr;
+}
+
+static HRESULT vboxNetCfgWinNetAdpUninstall(IN INetCfg *pNc, LPCWSTR pwszId, DWORD InfRmFlags)
+{
+    NOREF(pNc);
+    NonStandardLog("Finding NetAdp driver package and trying to uninstall it ...\n");
+
+    VBoxDrvCfgInfUninstallAllF(L"Net", pwszId, InfRmFlags);
+    NonStandardLog("NetAdp is not installed currently\n");
+    return S_OK;
+}
+
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinNetAdpUninstall(IN INetCfg *pNc, IN LPCWSTR pwszId)
+{
+    return vboxNetCfgWinNetAdpUninstall(pNc, pwszId, SUOI_FORCEDELETE);
+}
+
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinNetAdpInstall(IN INetCfg *pNc,
+                                                       IN LPCWSTR const pInfFullPath)
+{
+    NonStandardLog("NetAdp will be installed ...\n");
+    HRESULT hr = vboxNetCfgWinInstallInfAndComponent(pNc, VBOXNETCFGWIN_NETADP_ID,
+                                             &GUID_DEVCLASS_NET,
+                                             &pInfFullPath,
+                                             1,
+                                             NULL);
+    return hr;
+}
+
+#define VBOXNETCFGWIN_NETLWF_ID    L"oracle_VBoxNetLwf"
+
+static HRESULT vboxNetCfgWinNetLwfUninstall(IN INetCfg *pNc, DWORD InfRmFlags)
+{
+    INetCfgComponent * pNcc = NULL;
+    HRESULT hr = pNc->FindComponent(VBOXNETCFGWIN_NETLWF_ID, &pNcc);
+    if (hr == S_OK)
+    {
+        NonStandardLog("NetLwf is installed currently, uninstalling ...\n");
+
+        hr = VBoxNetCfgWinUninstallComponent(pNc, pNcc);
+
+        pNcc->Release();
+    }
+    else if (hr == S_FALSE)
+    {
+        NonStandardLog("NetLwf is not installed currently\n");
+        hr = S_OK;
+    }
+    else
+    {
+        NonStandardLogFlow(("FindComponent failed, hr (0x%x)\n", hr));
+        hr = S_OK;
+    }
+
+    VBoxDrvCfgInfUninstallAllF(L"NetService", VBOXNETCFGWIN_NETLWF_ID, InfRmFlags);
+
+    return hr;
+}
+
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinNetLwfUninstall(IN INetCfg *pNc)
+{
+    return vboxNetCfgWinNetLwfUninstall(pNc, 0);
+}
+
+static void VBoxNetCfgWinFilterLimitWorkaround(void)
+{
+    /*
+     * Need to check if the system has a limit of installed filter drivers. If it
+     * has, bump the limit to 14, which the maximum value supported by Windows 7.
+     * Note that we only touch the limit if it is set to the default value (8).
+     * See @bugref{7899}.
+     */
+    HKEY hNetKey;
+    DWORD dwMaxNumFilters = 0;
+    DWORD cbMaxNumFilters = sizeof(dwMaxNumFilters);
+    LONG hr = RegOpenKeyEx(HKEY_LOCAL_MACHINE,
+                           _T("SYSTEM\\CurrentControlSet\\Control\\Network"),
+                           0, KEY_QUERY_VALUE | KEY_SET_VALUE, &hNetKey);
+    if (SUCCEEDED(hr))
+    {
+        hr = RegQueryValueEx(hNetKey, _T("MaxNumFilters"), NULL, NULL,
+                             (LPBYTE)&dwMaxNumFilters, &cbMaxNumFilters);
+        if (SUCCEEDED(hr) && cbMaxNumFilters == sizeof(dwMaxNumFilters) && dwMaxNumFilters == 8)
+        {
+            dwMaxNumFilters = 14;
+            hr = RegSetValueEx(hNetKey, _T("MaxNumFilters"), 0, REG_DWORD,
+                             (LPBYTE)&dwMaxNumFilters, sizeof(dwMaxNumFilters));
+            if (SUCCEEDED(hr))
+                NonStandardLog("Adjusted the installed filter limit to 14...\n");
+            else
+                NonStandardLog("Failed to set MaxNumFilters, error code 0x%x\n", hr);
+        }
+        RegCloseKey(hNetKey);
+    }
+    else
+    {
+        NonStandardLog("Failed to open network key, error code 0x%x\n", hr);
+    }
+
+}
+
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinNetLwfInstall(IN INetCfg *pNc,
+                                                       IN LPCWSTR const pInfFullPath)
+{
+    HRESULT hr = vboxNetCfgWinNetLwfUninstall(pNc, SUOI_FORCEDELETE);
+    if (SUCCEEDED(hr))
+    {
+        VBoxNetCfgWinFilterLimitWorkaround();
+        NonStandardLog("NetLwf will be installed ...\n");
+        hr = vboxNetCfgWinInstallInfAndComponent(pNc, VBOXNETCFGWIN_NETLWF_ID,
+                                                 &GUID_DEVCLASS_NETSERVICE,
+                                                 &pInfFullPath,
+                                                 1,
+                                                 NULL);
+    }
+    return hr;
+}
+
+#define VBOX_CONNECTION_NAME L"VirtualBox Host-Only Network"
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinGenHostonlyConnectionName(PCWSTR DevName, WCHAR *pBuf, PULONG pcbBuf)
+{
+    const WCHAR * pSuffix = wcsrchr( DevName, L'#' );
+    ULONG cbSize = sizeof(VBOX_CONNECTION_NAME);
+
+    if (pSuffix)
+    {
+        cbSize += (ULONG)wcslen(pSuffix) * 2;
+        cbSize += 2; /* for space */
+    }
+
+    if (*pcbBuf < cbSize)
+    {
+        *pcbBuf = cbSize;
+        return E_FAIL;
+    }
+
+    wcscpy(pBuf, VBOX_CONNECTION_NAME);
+    if (pSuffix)
+    {
+        wcscat(pBuf, L" ");
+        wcscat(pBuf, pSuffix);
+    }
+
+    return S_OK;
+}
+
+static BOOL vboxNetCfgWinAdjustHostOnlyNetworkInterfacePriority(IN INetCfg *pNc, IN INetCfgComponent *pNcc, PVOID pContext)
+{
+    RT_NOREF1(pNc);
+    INetCfgComponentBindings *pNetCfgBindings;
+    GUID *pGuid = (GUID*)pContext;
+
+    /* Get component's binding. */
+    HRESULT hr = pNcc->QueryInterface(IID_INetCfgComponentBindings, (PVOID*)&pNetCfgBindings);
+    if (SUCCEEDED(hr))
+    {
+        /* Get binding path enumerator reference. */
+        IEnumNetCfgBindingPath *pEnumNetCfgBindPath;
+        hr = pNetCfgBindings->EnumBindingPaths(EBP_BELOW, &pEnumNetCfgBindPath);
+        if (SUCCEEDED(hr))
+        {
+            bool bFoundIface = false;
+            hr = pEnumNetCfgBindPath->Reset();
+            do
+            {
+                INetCfgBindingPath *pNetCfgBindPath;
+                hr = pEnumNetCfgBindPath->Next(1, &pNetCfgBindPath, NULL);
+                if (hr == S_OK)
+                {
+                    IEnumNetCfgBindingInterface *pEnumNetCfgBindIface;
+                    hr = pNetCfgBindPath->EnumBindingInterfaces(&pEnumNetCfgBindIface);
+                    if (hr == S_OK)
+                    {
+                        pEnumNetCfgBindIface->Reset();
+                        do
+                        {
+                            INetCfgBindingInterface *pNetCfgBindIfce;
+                            hr = pEnumNetCfgBindIface->Next(1, &pNetCfgBindIfce, NULL);
+                            if (hr == S_OK)
+                            {
+                                INetCfgComponent *pNetCfgCompo;
+                                hr = pNetCfgBindIfce->GetLowerComponent(&pNetCfgCompo);
+                                if (hr == S_OK)
+                                {
+                                    ULONG uComponentStatus;
+                                    hr = pNetCfgCompo->GetDeviceStatus(&uComponentStatus);
+                                    if (hr == S_OK)
+                                    {
+                                        GUID guid;
+                                        hr = pNetCfgCompo->GetInstanceGuid(&guid);
+                                        if (   hr == S_OK
+                                            && guid == *pGuid)
+                                        {
+                                            hr = pNetCfgBindings->MoveAfter(pNetCfgBindPath, NULL);
+                                            if (FAILED(hr))
+                                                NonStandardLogFlow(("Unable to move interface, hr (0x%x)\n", hr));
+                                            bFoundIface = true;
+                                            /*
+                                             * Enable binding paths for host-only adapters bound to bridged filter
+                                             * (see @bugref{8140}).
+                                             */
+                                            HRESULT hr2;
+                                            LPWSTR pwszHwId = NULL;
+                                            if ((hr2 = pNcc->GetId(&pwszHwId)) != S_OK)
+                                                NonStandardLogFlow(("Failed to get HW ID, hr (0x%x)\n", hr2));
+                                            else if (_wcsnicmp(pwszHwId, VBOXNETCFGWIN_NETLWF_ID,
+                                                               sizeof(VBOXNETCFGWIN_NETLWF_ID)/2))
+                                                NonStandardLogFlow(("Ignoring component %ls\n", pwszHwId));
+                                            else if ((hr2 = pNetCfgBindPath->IsEnabled()) != S_FALSE)
+                                                NonStandardLogFlow(("Already enabled binding path, hr (0x%x)\n", hr2));
+                                            else if ((hr2 = pNetCfgBindPath->Enable(TRUE)) != S_OK)
+                                                NonStandardLogFlow(("Failed to enable binding path, hr (0x%x)\n", hr2));
+                                            else
+                                                NonStandardLogFlow(("Enabled binding path\n"));
+                                            if (pwszHwId)
+                                                CoTaskMemFree(pwszHwId);
+                                        }
+                                    }
+                                    pNetCfgCompo->Release();
+                                }
+                                else
+                                    NonStandardLogFlow(("GetLowerComponent failed, hr (0x%x)\n", hr));
+                                pNetCfgBindIfce->Release();
+                            }
+                            else
+                            {
+                                if (hr == S_FALSE) /* No more binding interfaces? */
+                                    hr = S_OK;
+                                else
+                                    NonStandardLogFlow(("Next binding interface failed, hr (0x%x)\n", hr));
+                                break;
+                            }
+                        } while (!bFoundIface);
+                        pEnumNetCfgBindIface->Release();
+                    }
+                    else
+                        NonStandardLogFlow(("EnumBindingInterfaces failed, hr (0x%x)\n", hr));
+                    pNetCfgBindPath->Release();
+                }
+                else
+                {
+                    if (hr == S_FALSE) /* No more binding paths? */
+                        hr = S_OK;
+                    else
+                        NonStandardLogFlow(("Next bind path failed, hr (0x%x)\n", hr));
+                    break;
+                }
+            } while (!bFoundIface);
+            pEnumNetCfgBindPath->Release();
+        }
+        else
+            NonStandardLogFlow(("EnumBindingPaths failed, hr (0x%x)\n", hr));
+        pNetCfgBindings->Release();
+    }
+    else
+        NonStandardLogFlow(("QueryInterface for IID_INetCfgComponentBindings failed, hr (0x%x)\n", hr));
+    return TRUE;
+}
+
+static UINT WINAPI vboxNetCfgWinPspFileCallback(
+        PVOID Context,
+        UINT Notification,
+        UINT_PTR Param1,
+        UINT_PTR Param2
+    )
+{
+    switch (Notification)
+    {
+        case SPFILENOTIFY_TARGETNEWER:
+        case SPFILENOTIFY_TARGETEXISTS:
+            return TRUE;
+    }
+    return SetupDefaultQueueCallback(Context, Notification, Param1, Param2);
+}
+
+/* The original source of the VBoxNetAdp adapter creation/destruction code has the following copyright */
+/*
+   Copyright 2004 by the Massachusetts Institute of Technology
+
+   All rights reserved.
+
+   Permission to use, copy, modify, and distribute this software and its
+   documentation for any purpose and without fee is hereby granted,
+   provided that the above copyright notice appear in all copies and that
+   both that copyright notice and this permission notice appear in
+   supporting documentation, and that the name of the Massachusetts
+   Institute of Technology (M.I.T.) not be used in advertising or publicity
+   pertaining to distribution of the software without specific, written
+   prior permission.
+
+   M.I.T. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
+   ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
+   M.I.T. BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
+   ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+   WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+   ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+   SOFTWARE.
+*/
+
+
+/**
+ *  Use the IShellFolder API to rename the connection.
+ */
+static HRESULT rename_shellfolder (PCWSTR wGuid, PCWSTR wNewName)
+{
+    /* This is the GUID for the network connections folder. It is constant.
+     * {7007ACC7-3202-11D1-AAD2-00805FC1270E} */
+    const GUID CLSID_NetworkConnections = {
+        0x7007ACC7, 0x3202, 0x11D1, {
+            0xAA, 0xD2, 0x00, 0x80, 0x5F, 0xC1, 0x27, 0x0E
+        }
+    };
+
+    LPITEMIDLIST pidl = NULL;
+    IShellFolder *pShellFolder = NULL;
+    HRESULT hr;
+
+    /* Build the display name in the form "::{GUID}". */
+    if (wcslen(wGuid) >= MAX_PATH)
+        return E_INVALIDARG;
+    WCHAR szAdapterGuid[MAX_PATH + 2] = {0};
+    swprintf(szAdapterGuid, L"::%ls", wGuid);
+
+    /* Create an instance of the network connections folder. */
+    hr = CoCreateInstance(CLSID_NetworkConnections, NULL,
+                          CLSCTX_INPROC_SERVER, IID_IShellFolder,
+                          reinterpret_cast<LPVOID *>(&pShellFolder));
+    /* Parse the display name. */
+    if (SUCCEEDED (hr))
+    {
+        hr = pShellFolder->ParseDisplayName (NULL, NULL, szAdapterGuid, NULL,
+                                             &pidl, NULL);
+    }
+    if (SUCCEEDED (hr))
+    {
+        hr = pShellFolder->SetNameOf (NULL, pidl, wNewName, SHGDN_NORMAL,
+                                      &pidl);
+    }
+
+    CoTaskMemFree (pidl);
+
+    if (pShellFolder)
+        pShellFolder->Release();
+
+    return hr;
+}
+
+/**
+ * Loads a system DLL.
+ *
+ * @returns Module handle or NULL
+ * @param   pszName             The DLL name.
+ */
+static HMODULE loadSystemDll(const char *pszName)
+{
+    char   szPath[MAX_PATH];
+    UINT   cchPath = GetSystemDirectoryA(szPath, sizeof(szPath));
+    size_t cbName  = strlen(pszName) + 1;
+    if (cchPath + 1 + cbName > sizeof(szPath))
+        return NULL;
+    szPath[cchPath] = '\\';
+    memcpy(&szPath[cchPath + 1], pszName, cbName);
+    return LoadLibraryA(szPath);
+}
+
+static bool vboxNetCfgWinDetectStaleConnection(PCWSTR pName)
+{
+    HKEY hkeyConnection, hkeyAdapter, hkeyAdapters;
+    WCHAR wszAdaptersKeyName[] = L"SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}";
+    WCHAR wszAdapterSubKeyName[MAX_PATH];
+    LSTATUS status = RegOpenKeyEx(HKEY_LOCAL_MACHINE, wszAdaptersKeyName, 0, KEY_ALL_ACCESS, &hkeyAdapters);
+    if (status != ERROR_SUCCESS)
+        return false;
+
+    bool fFailureImminent = false;
+    for (DWORD i = 0; !fFailureImminent; ++i)
+    {
+        DWORD cbName = MAX_PATH;
+        status = RegEnumKeyEx(hkeyAdapters, i, wszAdapterSubKeyName, &cbName, NULL, NULL, NULL, NULL);
+        // if (status == ERROR_NO_MORE_ITEMS)
+        //     break;
+        if (status != ERROR_SUCCESS)
+            break;
+
+        status = RegOpenKeyEx(hkeyAdapters, wszAdapterSubKeyName, 0, KEY_ALL_ACCESS, &hkeyAdapter);
+        if (status == ERROR_SUCCESS)
+        {
+            status = RegOpenKeyEx(hkeyAdapter, L"Connection", 0, KEY_ALL_ACCESS, &hkeyConnection);
+            if (status == ERROR_SUCCESS)
+            {
+                WCHAR wszName[MAX_PATH];
+                cbName = MAX_PATH;
+                status = RegQueryValueEx(hkeyConnection, L"Name", NULL, NULL, (LPBYTE)wszName, &cbName);
+                if (status == ERROR_SUCCESS)
+                    if (wcsicmp(wszName, pName) == 0)
+                        fFailureImminent = true;
+                RegCloseKey(hkeyConnection);
+            }
+            RegCloseKey(hkeyAdapter);
+        }
+    }
+    RegCloseKey(hkeyAdapters);
+
+    return fFailureImminent;
+}
+
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinRenameConnection (LPWSTR pGuid, PCWSTR NewName)
+{
+    typedef HRESULT (WINAPI *lpHrRenameConnection) (const GUID *, PCWSTR);
+    lpHrRenameConnection RenameConnectionFunc = NULL;
+    HRESULT status;
+
+    /*
+     * Before attempting to rename the connection, check if there is a stale
+     * connection with the same name. We must return ok, so the rest of
+     * configuration process proceeds normally.
+     */
+    if (vboxNetCfgWinDetectStaleConnection(NewName))
+        return S_OK;
+    /* First try the IShellFolder interface, which was unimplemented
+     * for the network connections folder before XP. */
+    status = rename_shellfolder (pGuid, NewName);
+    if (status == E_NOTIMPL)
+    {
+/** @todo that code doesn't seem to work! */
+        /* The IShellFolder interface is not implemented on this platform.
+         * Try the (undocumented) HrRenameConnection API in the netshell
+         * library. */
+        CLSID clsid;
+        HINSTANCE hNetShell;
+        status = CLSIDFromString ((LPOLESTR) pGuid, &clsid);
+        if (FAILED(status))
+            return E_FAIL;
+        hNetShell = loadSystemDll("netshell.dll");
+        if (hNetShell == NULL)
+            return E_FAIL;
+        RenameConnectionFunc =
+          (lpHrRenameConnection) GetProcAddress (hNetShell,
+                                                 "HrRenameConnection");
+        if (RenameConnectionFunc == NULL)
+        {
+            FreeLibrary (hNetShell);
+            return E_FAIL;
+        }
+        status = RenameConnectionFunc (&clsid, NewName);
+        FreeLibrary (hNetShell);
+    }
+    if (FAILED (status))
+        return status;
+
+    return S_OK;
+}
+
+#define DRIVERHWID _T("sun_VBoxNetAdp")
+
+#define SetErrBreak(strAndArgs) \
+    if (1) { \
+        hrc = E_FAIL; \
+        NonStandardLog strAndArgs; \
+        bstrError = bstr_printf strAndArgs; \
+        break; \
+    } else do {} while (0)
+
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinRemoveHostOnlyNetworkInterface(IN const GUID *pGUID, OUT BSTR *pErrMsg)
+{
+    HRESULT hrc = S_OK;
+    bstr_t bstrError;
+
+    do
+    {
+        TCHAR lszPnPInstanceId [512] = {0};
+
+        /* We have to find the device instance ID through a registry search */
+
+        HKEY hkeyNetwork = 0;
+        HKEY hkeyConnection = 0;
+
+        do
+        {
+            WCHAR strRegLocation [256];
+            WCHAR wszGuid[50];
+
+            int length = StringFromGUID2(*pGUID, wszGuid, RT_ELEMENTS(wszGuid));
+            if (!length)
+                SetErrBreak(("Failed to create a Guid string"));
+
+            swprintf (strRegLocation,
+                     L"SYSTEM\\CurrentControlSet\\Control\\Network\\"
+                     L"{4D36E972-E325-11CE-BFC1-08002BE10318}\\%s",
+                     wszGuid);
+
+            LONG status;
+            status = RegOpenKeyExW (HKEY_LOCAL_MACHINE, strRegLocation, 0,
+                                    KEY_READ, &hkeyNetwork);
+            if ((status != ERROR_SUCCESS) || !hkeyNetwork)
+                SetErrBreak (("Host interface network is not found in registry (%S) [1]",
+                    strRegLocation));
+
+            status = RegOpenKeyExW (hkeyNetwork, L"Connection", 0,
+                                    KEY_READ, &hkeyConnection);
+            if ((status != ERROR_SUCCESS) || !hkeyConnection)
+                SetErrBreak (("Host interface network is not found in registry (%S) [2]",
+                    strRegLocation));
+
+            DWORD len = sizeof (lszPnPInstanceId);
+            DWORD dwKeyType;
+            status = RegQueryValueExW (hkeyConnection, L"PnPInstanceID", NULL,
+                                       &dwKeyType, (LPBYTE) lszPnPInstanceId, &len);
+            if ((status != ERROR_SUCCESS) || (dwKeyType != REG_SZ))
+                SetErrBreak (("Host interface network is not found in registry (%S) [3]",
+                    strRegLocation));
+        }
+        while (0);
+
+        if (hkeyConnection)
+            RegCloseKey (hkeyConnection);
+        if (hkeyNetwork)
+            RegCloseKey (hkeyNetwork);
+
+        if (FAILED (hrc))
+            break;
+
+        /*
+         * Now we are going to enumerate all network devices and
+         * wait until we encounter the right device instance ID
+         */
+
+        HDEVINFO hDeviceInfo = INVALID_HANDLE_VALUE;
+
+        do
+        {
+            BOOL ok;
+            GUID netGuid;
+            SP_DEVINFO_DATA DeviceInfoData;
+            DWORD index = 0;
+            BOOL found = FALSE;
+            DWORD size = 0;
+
+            /* initialize the structure size */
+            DeviceInfoData.cbSize = sizeof (SP_DEVINFO_DATA);
+
+            /* copy the net class GUID */
+            memcpy(&netGuid, &GUID_DEVCLASS_NET, sizeof (GUID_DEVCLASS_NET));
+
+            /* return a device info set contains all installed devices of the Net class */
+            hDeviceInfo = SetupDiGetClassDevs(&netGuid, NULL, NULL, DIGCF_PRESENT);
+
+            if (hDeviceInfo == INVALID_HANDLE_VALUE)
+                SetErrBreak(("SetupDiGetClassDevs failed (0x%08X)", GetLastError()));
+
+            /* enumerate the driver info list */
+            while (TRUE)
+            {
+                TCHAR *deviceHwid;
+
+                ok = SetupDiEnumDeviceInfo(hDeviceInfo, index, &DeviceInfoData);
+
+                if (!ok)
+                {
+                    if (GetLastError() == ERROR_NO_MORE_ITEMS)
+                        break;
+                    else
+                    {
+                        index++;
+                        continue;
+                    }
+                }
+
+                /* try to get the hardware ID registry property */
+                ok = SetupDiGetDeviceRegistryProperty(hDeviceInfo,
+                                                      &DeviceInfoData,
+                                                      SPDRP_HARDWAREID,
+                                                      NULL,
+                                                      NULL,
+                                                      0,
+                                                      &size);
+                if (!ok)
+                {
+                    if (GetLastError() != ERROR_INSUFFICIENT_BUFFER)
+                    {
+                        index++;
+                        continue;
+                    }
+
+                    deviceHwid = (TCHAR *) malloc(size);
+                    ok = SetupDiGetDeviceRegistryProperty(hDeviceInfo,
+                                                          &DeviceInfoData,
+                                                          SPDRP_HARDWAREID,
+                                                          NULL,
+                                                          (PBYTE)deviceHwid,
+                                                          size,
+                                                          NULL);
+                    if (!ok)
+                    {
+                        free(deviceHwid);
+                        deviceHwid = NULL;
+                        index++;
+                        continue;
+                    }
+                }
+                else
+                {
+                    /* something is wrong.  This shouldn't have worked with a NULL buffer */
+                    index++;
+                    continue;
+                }
+
+                for (TCHAR *t = deviceHwid;
+                     t && *t && t < &deviceHwid[size / sizeof(TCHAR)];
+                     t += _tcslen(t) + 1)
+                {
+                    if (!_tcsicmp(DRIVERHWID, t))
+                    {
+                          /* get the device instance ID */
+                          TCHAR devId[MAX_DEVICE_ID_LEN];
+                          if (CM_Get_Device_ID(DeviceInfoData.DevInst,
+                                               devId, MAX_DEVICE_ID_LEN, 0) == CR_SUCCESS)
+                          {
+                              /* compare to what we determined before */
+                              if (wcscmp(devId, lszPnPInstanceId) == 0)
+                              {
+                                  found = TRUE;
+                                  break;
+                              }
+                          }
+                    }
+                }
+
+                if (deviceHwid)
+                {
+                    free (deviceHwid);
+                    deviceHwid = NULL;
+                }
+
+                if (found)
+                    break;
+
+                index++;
+            }
+
+            if (found == FALSE)
+                SetErrBreak (("Host Interface Network driver not found (0x%08X)",
+                              GetLastError()));
+
+            ok = SetupDiSetSelectedDevice (hDeviceInfo, &DeviceInfoData);
+            if (!ok)
+                SetErrBreak (("SetupDiSetSelectedDevice failed (0x%08X)",
+                              GetLastError()));
+
+            ok = SetupDiCallClassInstaller (DIF_REMOVE, hDeviceInfo, &DeviceInfoData);
+            if (!ok)
+                SetErrBreak (("SetupDiCallClassInstaller (DIF_REMOVE) failed (0x%08X)",
+                              GetLastError()));
+        }
+        while (0);
+
+        /* clean up the device info set */
+        if (hDeviceInfo != INVALID_HANDLE_VALUE)
+            SetupDiDestroyDeviceInfoList (hDeviceInfo);
+
+        if (FAILED (hrc))
+            break;
+    }
+    while (0);
+
+    if (pErrMsg && bstrError.length())
+        *pErrMsg = bstrError.Detach();
+
+    return hrc;
+}
+
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinUpdateHostOnlyNetworkInterface(LPCWSTR pcsxwInf, BOOL *pbRebootRequired, LPCWSTR pcsxwId)
+{
+    return VBoxDrvCfgDrvUpdate(pcsxwId, pcsxwInf, pbRebootRequired);
+}
+
+static const char *vboxNetCfgWinGetStateText(DWORD dwState)
+{
+    switch (dwState)
+    {
+        case SERVICE_STOPPED: return "is not running";
+        case SERVICE_STOP_PENDING: return "is stopping";
+        case SERVICE_CONTINUE_PENDING: return "continue is pending";
+        case SERVICE_PAUSE_PENDING: return "pause is pending";
+        case SERVICE_PAUSED: return "is paused";
+        case SERVICE_RUNNING: return "is running";
+        case SERVICE_START_PENDING: return "is starting";
+    }
+    return "state is invalid";
+}
+
+static DWORD vboxNetCfgWinGetNetSetupState(SC_HANDLE hService)
+{
+    SERVICE_STATUS status;
+    status.dwCurrentState = SERVICE_RUNNING;
+    if (hService) {
+        if (QueryServiceStatus(hService, &status))
+            NonStandardLogFlow(("NetSetupSvc %s\n", vboxNetCfgWinGetStateText(status.dwCurrentState)));
+        else
+            NonStandardLogFlow(("QueryServiceStatus failed (0x%x)\n", GetLastError()));
+    }
+    return status.dwCurrentState;
+}
+
+DECLINLINE(bool) vboxNetCfgWinIsNetSetupRunning(SC_HANDLE hService)
+{
+    return vboxNetCfgWinGetNetSetupState(hService) == SERVICE_RUNNING;
+}
+
+DECLINLINE(bool) vboxNetCfgWinIsNetSetupStopped(SC_HANDLE hService)
+{
+    return vboxNetCfgWinGetNetSetupState(hService) == SERVICE_STOPPED;
+}
+
+typedef struct {
+    BSTR bstrName;
+    GUID *pGuid;
+    HRESULT hr;
+} RENAMING_CONTEXT;
+
+static BOOL vboxNetCfgWinRenameHostOnlyNetworkInterface(IN INetCfg *pNc, IN INetCfgComponent *pNcc, PVOID pContext)
+{
+    RT_NOREF1(pNc);
+    RENAMING_CONTEXT *pParams = (RENAMING_CONTEXT *)pContext;
+
+    GUID guid;
+    pParams->hr = pNcc->GetInstanceGuid(&guid);
+    if ( pParams->hr == S_OK && guid == *pParams->pGuid)
+    {
+        /* Located our component, rename it */
+        pParams->hr = pNcc->SetDisplayName(pParams->bstrName);
+        return FALSE;
+    }
+    return TRUE;
+}
+
+/* We assume the following name matches the device description in vboxnetadp6.inf */
+#define HOSTONLY_ADAPTER_NAME "VirtualBox Host-Only Ethernet Adapter"
+
+/*
+ * Enumerate all host-only adapters collecting their names into a set, then
+ * come up with the next available name by taking the first unoccupied index.
+ */
+static HRESULT vboxNetCfgWinNextAvailableDevName(bstr_t& bstrName)
+{
+    SP_DEVINFO_DATA DeviceInfoData;
+    /* initialize the structure size */
+    DeviceInfoData.cbSize = sizeof (SP_DEVINFO_DATA);
+
+    HDEVINFO DeviceInfoSet = SetupDiGetClassDevs(&GUID_DEVCLASS_NET, NULL, NULL, DIGCF_PRESENT);
+    if (DeviceInfoSet == INVALID_HANDLE_VALUE)
+        return GetLastError();
+
+    DWORD i;
+    std::set<bstr_t> aExistingNames;
+    for (i = 0; SetupDiEnumDeviceInfo(DeviceInfoSet, i, &DeviceInfoData); ++i)
+    {
+        /* Should be more than enough for both our device id and our device name, we do not care about the rest */
+        WCHAR wszDevName[64];
+        if (!SetupDiGetDeviceRegistryProperty(DeviceInfoSet, &DeviceInfoData, SPDRP_HARDWAREID,
+                                              NULL, (PBYTE)wszDevName, sizeof(wszDevName), NULL))
+            continue;
+        /* Ignore everything except our host-only adapters */
+        if (_wcsicmp(wszDevName, DRIVERHWID))
+            continue;
+        if (   SetupDiGetDeviceRegistryProperty(DeviceInfoSet, &DeviceInfoData, SPDRP_FRIENDLYNAME,
+                                                NULL, (PBYTE)wszDevName, sizeof(wszDevName), NULL)
+            || SetupDiGetDeviceRegistryProperty(DeviceInfoSet, &DeviceInfoData, SPDRP_DEVICEDESC,
+                                                NULL, (PBYTE)wszDevName, sizeof(wszDevName), NULL))
+            aExistingNames.insert(bstr_t(wszDevName));
+    }
+    /* Try the name without index first */
+    bstrName = HOSTONLY_ADAPTER_NAME;
+    if (aExistingNames.find(bstrName) != aExistingNames.end())
+    {
+        WCHAR wszSuffix[16];
+        /* Try indexed names until we find unused one */
+        for (i = 2;; ++i)
+        {
+            wsprintf(wszSuffix, L" #%u", i);
+            if (aExistingNames.find(bstrName + wszSuffix) == aExistingNames.end())
+            {
+                bstrName += wszSuffix;
+                break;
+            }
+        }
+    }
+
+    if (DeviceInfoSet)
+        SetupDiDestroyDeviceInfoList(DeviceInfoSet);
+    return S_OK;
+}
+
+static HRESULT vboxNetCfgWinCreateHostOnlyNetworkInterface(IN LPCWSTR pInfPath, IN bool bIsInfPathFile, IN BSTR bstrDesiredName,
+                                                           OUT GUID *pGuid, OUT BSTR *lppszName, OUT BSTR *pErrMsg)
+{
+    HRESULT hrc = S_OK;
+
+    HDEVINFO hDeviceInfo = INVALID_HANDLE_VALUE;
+    SP_DEVINFO_DATA DeviceInfoData;
+    PVOID pQueueCallbackContext = NULL;
+    DWORD ret = 0;
+    BOOL registered = FALSE;
+    BOOL destroyList = FALSE;
+    WCHAR pWCfgGuidString [50];
+    WCHAR DevName[256];
+    HKEY hkey = (HKEY)INVALID_HANDLE_VALUE;
+    bstr_t bstrError;
+    bstr_t bstrNewInterfaceName;
+
+    if (SysStringLen(bstrDesiredName) != 0)
+        bstrNewInterfaceName = bstrDesiredName;
+    else
+    {
+        hrc = vboxNetCfgWinNextAvailableDevName(bstrNewInterfaceName);
+        if (FAILED(hrc))
+            NonStandardLogFlow(("vboxNetCfgWinNextAvailableDevName failed with 0x%x\n", hrc));
+    }
+
+    do
+    {
+        BOOL found = FALSE;
+        GUID netGuid;
+        SP_DRVINFO_DATA DriverInfoData;
+        SP_DEVINSTALL_PARAMS DeviceInstallParams;
+        TCHAR className [MAX_PATH];
+        DWORD index = 0;
+        PSP_DRVINFO_DETAIL_DATA pDriverInfoDetail;
+        /* for our purposes, 2k buffer is more
+         * than enough to obtain the hardware ID
+         * of the VBoxNetAdp driver. */
+        DWORD detailBuf [2048];
+
+        DWORD cbSize;
+        DWORD dwValueType;
+
+        /* initialize the structure size */
+        DeviceInfoData.cbSize = sizeof (SP_DEVINFO_DATA);
+        DriverInfoData.cbSize = sizeof (SP_DRVINFO_DATA);
+
+        /* copy the net class GUID */
+        memcpy(&netGuid, &GUID_DEVCLASS_NET, sizeof(GUID_DEVCLASS_NET));
+
+        /* create an empty device info set associated with the net class GUID */
+        hDeviceInfo = SetupDiCreateDeviceInfoList(&netGuid, NULL);
+        if (hDeviceInfo == INVALID_HANDLE_VALUE)
+            SetErrBreak (("SetupDiCreateDeviceInfoList failed (0x%08X)",
+                          GetLastError()));
+
+        /* get the class name from GUID */
+        BOOL fResult = SetupDiClassNameFromGuid (&netGuid, className, MAX_PATH, NULL);
+        if (!fResult)
+            SetErrBreak (("SetupDiClassNameFromGuid failed (0x%08X)",
+                          GetLastError()));
+
+        /* create a device info element and add the new device instance
+         * key to registry */
+        fResult = SetupDiCreateDeviceInfo (hDeviceInfo, className, &netGuid, NULL, NULL,
+                                     DICD_GENERATE_ID, &DeviceInfoData);
+        if (!fResult)
+            SetErrBreak (("SetupDiCreateDeviceInfo failed (0x%08X)",
+                          GetLastError()));
+
+        /* select the newly created device info to be the currently
+           selected member */
+        fResult = SetupDiSetSelectedDevice (hDeviceInfo, &DeviceInfoData);
+        if (!fResult)
+            SetErrBreak (("SetupDiSetSelectedDevice failed (0x%08X)",
+                          GetLastError()));
+
+        if (pInfPath)
+        {
+            /* get the device install parameters and disable filecopy */
+            DeviceInstallParams.cbSize = sizeof(SP_DEVINSTALL_PARAMS);
+            fResult = SetupDiGetDeviceInstallParams (hDeviceInfo, &DeviceInfoData,
+                                                &DeviceInstallParams);
+            if (fResult)
+            {
+                memset(DeviceInstallParams.DriverPath, 0, sizeof(DeviceInstallParams.DriverPath));
+                size_t pathLenght = wcslen(pInfPath) + 1/* null terminator */;
+                if (pathLenght < sizeof(DeviceInstallParams.DriverPath)/sizeof(DeviceInstallParams.DriverPath[0]))
+                {
+                    memcpy(DeviceInstallParams.DriverPath, pInfPath, pathLenght*sizeof(DeviceInstallParams.DriverPath[0]));
+
+                    if (bIsInfPathFile)
+                    {
+                        DeviceInstallParams.Flags |= DI_ENUMSINGLEINF;
+                    }
+
+                    fResult = SetupDiSetDeviceInstallParams(hDeviceInfo, &DeviceInfoData,
+                                                       &DeviceInstallParams);
+                    if (!fResult)
+                    {
+                        DWORD winEr = GetLastError();
+                        NonStandardLogFlow(("SetupDiSetDeviceInstallParams failed, winEr (%d)\n", winEr));
+                        break;
+                    }
+                }
+                else
+                {
+                    NonStandardLogFlow(("SetupDiSetDeviceInstallParams faileed: INF path is too long\n"));
+                    break;
+                }
+            }
+            else
+            {
+                DWORD winEr = GetLastError();
+                NonStandardLogFlow(("SetupDiGetDeviceInstallParams failed, winEr (%d)\n", winEr));
+            }
+        }
+
+        /* build a list of class drivers */
+        fResult = SetupDiBuildDriverInfoList (hDeviceInfo, &DeviceInfoData,
+                                              SPDIT_CLASSDRIVER);
+        if (!fResult)
+            SetErrBreak (("SetupDiBuildDriverInfoList failed (0x%08X)",
+                          GetLastError()));
+
+        destroyList = TRUE;
+
+        /* enumerate the driver info list */
+        while (TRUE)
+        {
+            BOOL ret;
+
+            ret = SetupDiEnumDriverInfo (hDeviceInfo, &DeviceInfoData,
+                                         SPDIT_CLASSDRIVER, index, &DriverInfoData);
+
+            /* if the function failed and GetLastError() returned
+             * ERROR_NO_MORE_ITEMS, then we have reached the end of the
+             * list.  Otherwise there was something wrong with this
+             * particular driver. */
+            if (!ret)
+            {
+                if (GetLastError() == ERROR_NO_MORE_ITEMS)
+                    break;
+                else
+                {
+                    index++;
+                    continue;
+                }
+            }
+
+            pDriverInfoDetail = (PSP_DRVINFO_DETAIL_DATA) detailBuf;
+            pDriverInfoDetail->cbSize = sizeof(SP_DRVINFO_DETAIL_DATA);
+
+            /* if we successfully find the hardware ID and it turns out to
+             * be the one for the loopback driver, then we are done. */
+            if (SetupDiGetDriverInfoDetail (hDeviceInfo,
+                                            &DeviceInfoData,
+                                            &DriverInfoData,
+                                            pDriverInfoDetail,
+                                            sizeof (detailBuf),
+                                            NULL))
+            {
+                TCHAR * t;
+
+                /* pDriverInfoDetail->HardwareID is a MULTISZ string.  Go through the
+                 * whole list and see if there is a match somewhere. */
+                t = pDriverInfoDetail->HardwareID;
+                while (t && *t && t < (TCHAR *) &detailBuf [RT_ELEMENTS(detailBuf)])
+                {
+                    if (!_tcsicmp(t, DRIVERHWID))
+                        break;
+
+                    t += _tcslen(t) + 1;
+                }
+
+                if (t && *t && t < (TCHAR *) &detailBuf [RT_ELEMENTS(detailBuf)])
+                {
+                    found = TRUE;
+                    break;
+                }
+            }
+
+            index ++;
+        }
+
+        if (!found)
+            SetErrBreak(("Could not find Host Interface Networking driver! Please reinstall"));
+
+        /* set the loopback driver to be the currently selected */
+        fResult = SetupDiSetSelectedDriver (hDeviceInfo, &DeviceInfoData,
+                                       &DriverInfoData);
+        if (!fResult)
+            SetErrBreak(("SetupDiSetSelectedDriver failed (0x%08X)",
+                         GetLastError()));
+
+        /* register the phantom device to prepare for install */
+        fResult = SetupDiCallClassInstaller (DIF_REGISTERDEVICE, hDeviceInfo,
+                                             &DeviceInfoData);
+        if (!fResult)
+        {
+            DWORD err = GetLastError();
+            SetErrBreak (("SetupDiCallClassInstaller failed (0x%08X)",
+                          err));
+        }
+
+        /* registered, but remove if errors occur in the following code */
+        registered = TRUE;
+
+        /* ask the installer if we can install the device */
+        fResult = SetupDiCallClassInstaller (DIF_ALLOW_INSTALL, hDeviceInfo,
+                                             &DeviceInfoData);
+        if (!fResult)
+        {
+            if (GetLastError() != ERROR_DI_DO_DEFAULT)
+                SetErrBreak (("SetupDiCallClassInstaller (DIF_ALLOW_INSTALL) failed (0x%08X)",
+                              GetLastError()));
+            /* that's fine */
+        }
+
+        /* get the device install parameters and disable filecopy */
+        DeviceInstallParams.cbSize = sizeof(SP_DEVINSTALL_PARAMS);
+        fResult = SetupDiGetDeviceInstallParams (hDeviceInfo, &DeviceInfoData,
+                                                 &DeviceInstallParams);
+        if (fResult)
+        {
+            pQueueCallbackContext = SetupInitDefaultQueueCallback(NULL);
+            if (pQueueCallbackContext)
+            {
+                DeviceInstallParams.InstallMsgHandlerContext = pQueueCallbackContext;
+                DeviceInstallParams.InstallMsgHandler = (PSP_FILE_CALLBACK)vboxNetCfgWinPspFileCallback;
+                fResult = SetupDiSetDeviceInstallParams (hDeviceInfo, &DeviceInfoData,
+                                                    &DeviceInstallParams);
+                if (!fResult)
+                {
+                    DWORD winEr = GetLastError();
+                    NonStandardLogFlow(("SetupDiSetDeviceInstallParams failed, winEr (%d)\n", winEr));
+                }
+                Assert(fResult);
+            }
+            else
+            {
+                DWORD winEr = GetLastError();
+                NonStandardLogFlow(("SetupInitDefaultQueueCallback failed, winEr (%d)\n", winEr));
+            }
+        }
+        else
+        {
+            DWORD winEr = GetLastError();
+            NonStandardLogFlow(("SetupDiGetDeviceInstallParams failed, winEr (%d)\n", winEr));
+        }
+
+        /* install the files first */
+        fResult = SetupDiCallClassInstaller (DIF_INSTALLDEVICEFILES, hDeviceInfo,
+                                        &DeviceInfoData);
+        if (!fResult)
+            SetErrBreak (("SetupDiCallClassInstaller (DIF_INSTALLDEVICEFILES) failed (0x%08X)",
+                          GetLastError()));
+        /* get the device install parameters and disable filecopy */
+        DeviceInstallParams.cbSize = sizeof(SP_DEVINSTALL_PARAMS);
+        fResult = SetupDiGetDeviceInstallParams (hDeviceInfo, &DeviceInfoData,
+                                            &DeviceInstallParams);
+        if (fResult)
+        {
+            DeviceInstallParams.Flags |= DI_NOFILECOPY;
+            fResult = SetupDiSetDeviceInstallParams(hDeviceInfo, &DeviceInfoData,
+                                                    &DeviceInstallParams);
+            if (!fResult)
+                SetErrBreak (("SetupDiSetDeviceInstallParams failed (0x%08X)",
+                              GetLastError()));
+        }
+
+        /*
+         * Register any device-specific co-installers for this device,
+         */
+        fResult = SetupDiCallClassInstaller(DIF_REGISTER_COINSTALLERS,
+                                            hDeviceInfo,
+                                            &DeviceInfoData);
+        if (!fResult)
+            SetErrBreak (("SetupDiCallClassInstaller (DIF_REGISTER_COINSTALLERS) failed (0x%08X)",
+                          GetLastError()));
+
+        /*
+         * install any installer-specified interfaces.
+         * and then do the real install
+         */
+        fResult = SetupDiCallClassInstaller(DIF_INSTALLINTERFACES,
+                                            hDeviceInfo,
+                                            &DeviceInfoData);
+        if (!fResult)
+            SetErrBreak (("SetupDiCallClassInstaller (DIF_INSTALLINTERFACES) failed (0x%08X)",
+                          GetLastError()));
+
+        fResult = SetupDiCallClassInstaller(DIF_INSTALLDEVICE,
+                                            hDeviceInfo,
+                                            &DeviceInfoData);
+        if (!fResult)
+            SetErrBreak (("SetupDiCallClassInstaller (DIF_INSTALLDEVICE) failed (0x%08X)",
+                          GetLastError()));
+
+        /* Query the instance ID; on Windows 10, the registry key may take a short
+         * while to appear. Microsoft recommends waiting for up to 5 seconds, but
+         * we want to be on the safe side, so let's wait for 20 seconds. Waiting
+         * longer is harmful as network setup service will shut down after a period
+         * of inactivity.
+         */
+        for (int retries = 0; retries < 2 * 20; ++retries)
+        {
+            Sleep(500); /* half second */
+
+            /* Figure out NetCfgInstanceId */
+            hkey = SetupDiOpenDevRegKey(hDeviceInfo,
+                                        &DeviceInfoData,
+                                        DICS_FLAG_GLOBAL,
+                                        0,
+                                        DIREG_DRV,
+                                        KEY_READ);
+            if (hkey == INVALID_HANDLE_VALUE)
+                break;
+
+            cbSize = sizeof(pWCfgGuidString);
+            ret = RegQueryValueExW (hkey, L"NetCfgInstanceId", NULL,
+                                   &dwValueType, (LPBYTE) pWCfgGuidString, &cbSize);
+            /* As long as the return code is FILE_NOT_FOUND, sleep and retry. */
+            if (ret != ERROR_FILE_NOT_FOUND)
+                break;
+
+            RegCloseKey (hkey);
+            hkey = (HKEY)INVALID_HANDLE_VALUE;
+        }
+
+        if (ret == ERROR_FILE_NOT_FOUND)
+        {
+            hrc = E_ABORT;
+            break;
+        }
+
+        /*
+         * We need to check 'hkey' after we check 'ret' to distinguish the case
+         * of failed SetupDiOpenDevRegKey from the case when we timed out.
+         */
+        if (hkey == INVALID_HANDLE_VALUE)
+            SetErrBreak(("SetupDiOpenDevRegKey failed (0x%08X)", GetLastError()));
+
+        if (ret != ERROR_SUCCESS)
+            SetErrBreak(("Querying NetCfgInstanceId failed (0x%08X)", ret));
+
+        NET_LUID luid;
+        HRESULT hSMRes = vboxNetCfgWinGetInterfaceLUID(hkey, &luid);
+
+        /* Close the key as soon as possible. See @bugref{7973}. */
+        RegCloseKey (hkey);
+        hkey = (HKEY)INVALID_HANDLE_VALUE;
+
+        if (FAILED(hSMRes))
+        {
+            /*
+            *   The setting of Metric is not very important functionality,
+            *   So we will not break installation process due to this error.
+            */
+            NonStandardLogFlow(("vboxNetCfgWinCreateHostOnlyNetworkInterface Warning! "
+                                "vboxNetCfgWinGetInterfaceLUID failed, default metric "
+                                "for new interface will not be set, hr (0x%x)\n", hSMRes));
+        }
+        else
+        {
+            /*
+             *   Set default metric value of interface to fix multicast issue
+             *   See @bugref{6379} for details.
+             */
+            hSMRes = vboxNetCfgWinSetupMetric(&luid);
+            if (FAILED(hSMRes))
+            {
+                /*
+                 *   The setting of Metric is not very important functionality,
+                 *   So we will not break installation process due to this error.
+                 */
+                NonStandardLogFlow(("vboxNetCfgWinCreateHostOnlyNetworkInterface Warning! "
+                                    "vboxNetCfgWinSetupMetric failed, default metric "
+                                    "for new interface will not be set, hr (0x%x)\n", hSMRes));
+            }
+        }
+
+
+        /*
+         * We need to query the device name after we have succeeded in querying its
+         * instance ID to avoid similar waiting-and-retrying loop (see @bugref{7973}).
+         */
+        if (!SetupDiGetDeviceRegistryPropertyW(hDeviceInfo, &DeviceInfoData,
+                                               SPDRP_FRIENDLYNAME , /* IN DWORD Property,*/
+                                               NULL, /*OUT PDWORD PropertyRegDataType, OPTIONAL*/
+                                               (PBYTE)DevName, /*OUT PBYTE PropertyBuffer,*/
+                                               sizeof(DevName), /* IN DWORD PropertyBufferSize,*/
+                                               NULL /*OUT PDWORD RequiredSize OPTIONAL*/))
+        {
+            int err = GetLastError();
+            if (err != ERROR_INVALID_DATA)
+            {
+                SetErrBreak (("SetupDiGetDeviceRegistryProperty failed (0x%08X)",
+                              err));
+            }
+
+            if (!SetupDiGetDeviceRegistryPropertyW(hDeviceInfo, &DeviceInfoData,
+                              SPDRP_DEVICEDESC, /* IN DWORD Property,*/
+                              NULL, /*OUT PDWORD PropertyRegDataType, OPTIONAL*/
+                              (PBYTE)DevName, /*OUT PBYTE PropertyBuffer,*/
+                              sizeof(DevName), /* IN DWORD PropertyBufferSize,*/
+                              NULL /*OUT PDWORD RequiredSize OPTIONAL*/
+                            ))
+            {
+                err = GetLastError();
+                SetErrBreak (("SetupDiGetDeviceRegistryProperty failed (0x%08X)",
+                                              err));
+            }
+        }
+        /* No need to rename the device if the names match. */
+        if (!wcscmp(bstrNewInterfaceName.GetBSTR(), DevName))
+            bstrNewInterfaceName.Assign(NULL);
+#ifdef VBOXNETCFG_DELAYEDRENAME
+        /* Re-use DevName for device instance id retrieval. */
+        if (!SetupDiGetDeviceInstanceId(hDeviceInfo, &DeviceInfoData, DevName, RT_ELEMENTS(DevName), &cbSize))
+            SetErrBreak (("SetupDiGetDeviceInstanceId failed (0x%08X)",
+                          GetLastError()));
+#endif /* VBOXNETCFG_DELAYEDRENAME */
+    }
+    while (0);
+
+    /*
+     * cleanup
+     */
+    if (hkey != INVALID_HANDLE_VALUE)
+        RegCloseKey (hkey);
+
+    if (pQueueCallbackContext)
+        SetupTermDefaultQueueCallback(pQueueCallbackContext);
+
+    if (hDeviceInfo != INVALID_HANDLE_VALUE)
+    {
+        /* an error has occurred, but the device is registered, we must remove it */
+        if (ret != 0 && registered)
+            SetupDiCallClassInstaller(DIF_REMOVE, hDeviceInfo, &DeviceInfoData);
+
+        SetupDiDeleteDeviceInfo(hDeviceInfo, &DeviceInfoData);
+
+        /* destroy the driver info list */
+        if (destroyList)
+            SetupDiDestroyDriverInfoList(hDeviceInfo, &DeviceInfoData,
+                                         SPDIT_CLASSDRIVER);
+        /* clean up the device info set */
+        SetupDiDestroyDeviceInfoList (hDeviceInfo);
+    }
+
+    /* return the network connection GUID on success */
+    if (SUCCEEDED(hrc))
+    {
+        HRESULT hr;
+        INetCfg *pNetCfg = NULL;
+        LPWSTR lpszApp = NULL;
+
+        RENAMING_CONTEXT context;
+        context.hr = E_FAIL;
+
+        if (pGuid)
+        {
+            hrc = CLSIDFromString(pWCfgGuidString, (LPCLSID)pGuid);
+            if (FAILED(hrc))
+                NonStandardLogFlow(("CLSIDFromString failed, hrc (0x%x)\n", hrc));
+        }
+
+        hr = VBoxNetCfgWinQueryINetCfg(&pNetCfg, TRUE, L"VirtualBox Host-Only Creation",
+                                       30 * 1000, /* on Vista we often get 6to4svc.dll holding the lock, wait for 30 sec.  */
+                                       /** @todo special handling for 6to4svc.dll ???, i.e. several retrieves */
+                                       &lpszApp);
+        if (hr == S_OK)
+        {
+            if (!!bstrNewInterfaceName)
+            {
+                /* The assigned name does not match the desired one, rename the device */
+                context.bstrName = bstrNewInterfaceName.GetBSTR();
+                context.pGuid = pGuid;
+                hr = vboxNetCfgWinEnumNetCfgComponents(pNetCfg,
+                                                       &GUID_DEVCLASS_NET,
+                                                       vboxNetCfgWinRenameHostOnlyNetworkInterface,
+                                                       &context);
+            }
+            if (SUCCEEDED(hr))
+                hr = vboxNetCfgWinEnumNetCfgComponents(pNetCfg,
+                                                       &GUID_DEVCLASS_NETSERVICE,
+                                                       vboxNetCfgWinAdjustHostOnlyNetworkInterfacePriority,
+                                                       pGuid);
+            if (SUCCEEDED(hr))
+                hr = vboxNetCfgWinEnumNetCfgComponents(pNetCfg,
+                                                       &GUID_DEVCLASS_NETTRANS,
+                                                       vboxNetCfgWinAdjustHostOnlyNetworkInterfacePriority,
+                                                       pGuid);
+            if (SUCCEEDED(hr))
+                hr = vboxNetCfgWinEnumNetCfgComponents(pNetCfg,
+                                                       &GUID_DEVCLASS_NETCLIENT,
+                                                       vboxNetCfgWinAdjustHostOnlyNetworkInterfacePriority,
+                                                       pGuid);
+            if (SUCCEEDED(hr))
+            {
+                hr = pNetCfg->Apply();
+            }
+            else
+                NonStandardLogFlow(("Enumeration failed, hr 0x%x\n", hr));
+            VBoxNetCfgWinReleaseINetCfg(pNetCfg, TRUE);
+        }
+        else if (hr == NETCFG_E_NO_WRITE_LOCK && lpszApp)
+        {
+            NonStandardLogFlow(("Application %ws is holding the lock, failed\n", lpszApp));
+            CoTaskMemFree(lpszApp);
+        }
+        else
+            NonStandardLogFlow(("VBoxNetCfgWinQueryINetCfg failed, hr 0x%x\n", hr));
+
+#ifndef VBOXNETCFG_DELAYEDRENAME
+        if (SUCCEEDED(hr) && SUCCEEDED(context.hr))
+        {
+            /* The device has been successfully renamed, replace the name now. */
+            wcscpy_s(DevName, RT_ELEMENTS(DevName), bstrDesiredName);
+        }
+
+        WCHAR ConnectionName[128];
+        ULONG cbName = sizeof(ConnectionName);
+
+        hr = VBoxNetCfgWinGenHostonlyConnectionName(DevName, ConnectionName, &cbName);
+        if (SUCCEEDED(hr))
+            hr = VBoxNetCfgWinRenameConnection(pWCfgGuidString, ConnectionName);
+#endif
+        if (lppszName)
+        {
+            *lppszName = SysAllocString((const OLECHAR *) DevName);
+            if (!*lppszName)
+            {
+                NonStandardLogFlow(("SysAllocString failed\n"));
+                hrc = HRESULT_FROM_WIN32(ERROR_NOT_ENOUGH_MEMORY);
+            }
+        }
+    }
+
+    if (pErrMsg && bstrError.length())
+        *pErrMsg = bstrError.Detach();
+
+    return hrc;
+}
+
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinCreateHostOnlyNetworkInterface(IN LPCWSTR pInfPath, IN bool bIsInfPathFile, IN BSTR pwsDesiredName,
+                                                                        OUT GUID *pGuid, OUT BSTR *lppszName, OUT BSTR *pErrMsg)
+{
+    HRESULT hrc = vboxNetCfgWinCreateHostOnlyNetworkInterface(pInfPath, bIsInfPathFile, pwsDesiredName, pGuid, lppszName, pErrMsg);
+    if (hrc == E_ABORT)
+    {
+        NonStandardLogFlow(("Timed out while waiting for NetCfgInstanceId, try again immediately...\n"));
+        /*
+         * This is the first time we fail to obtain NetCfgInstanceId, let us
+         * retry it once. It is needed to handle the situation when network
+         * setup fails to recognize the arrival of our device node while it
+         * is busy removing another host-only interface, and it gets stuck
+         * with no matching network interface created for our device node.
+         * See @bugref{7973} for details.
+         */
+        hrc = vboxNetCfgWinCreateHostOnlyNetworkInterface(pInfPath, bIsInfPathFile, pwsDesiredName, pGuid, lppszName, pErrMsg);
+        if (hrc == E_ABORT)
+        {
+            NonStandardLogFlow(("Timed out again while waiting for NetCfgInstanceId, try again after a while...\n"));
+            /*
+             * This is the second time we fail to obtain NetCfgInstanceId, let us
+             * retry it once more. This time we wait to network setup service
+             * to go down before retrying. Hopefully it will resolve all error
+             * conditions. See @bugref{7973} for details.
+             */
+
+            SC_HANDLE hSCM = NULL;
+            SC_HANDLE hService = NULL;
+
+            hSCM = OpenSCManager(NULL, NULL, GENERIC_READ);
+            if (hSCM)
+            {
+                hService = OpenService(hSCM, _T("NetSetupSvc"), GENERIC_READ);
+                if (hService)
+                {
+                    for (int retries = 0; retries < 60 && !vboxNetCfgWinIsNetSetupStopped(hService); ++retries)
+                        Sleep(1000);
+                    CloseServiceHandle(hService);
+                    hrc = vboxNetCfgWinCreateHostOnlyNetworkInterface(pInfPath, bIsInfPathFile, pwsDesiredName, pGuid, lppszName, pErrMsg);
+                }
+                else
+                    NonStandardLogFlow(("OpenService failed (0x%x)\n", GetLastError()));
+                CloseServiceHandle(hSCM);
+            }
+            else
+                NonStandardLogFlow(("OpenSCManager failed (0x%x)", GetLastError()));
+            /* Give up and report the error. */
+            if (hrc == E_ABORT)
+            {
+                if (pErrMsg)
+                {
+                    bstr_t bstrError = bstr_printf("Querying NetCfgInstanceId failed (0x%08X)", ERROR_FILE_NOT_FOUND);
+                    *pErrMsg = bstrError.Detach();
+                }
+                hrc = E_FAIL;
+            }
+        }
+    }
+    return hrc;
+}
+
+
+HRESULT vboxLoadIpHelpFunctions(HINSTANCE& pIpHlpInstance)
+{
+    Assert(pIpHlpInstance != NULL);
+
+    pIpHlpInstance = loadSystemDll("Iphlpapi.dll");
+    if (pIpHlpInstance == NULL)
+        return E_FAIL;
+
+    g_pfnInitializeIpInterfaceEntry =
+        (PFNINITIALIZEIPINTERFACEENTRY)GetProcAddress(pIpHlpInstance, "InitializeIpInterfaceEntry");
+    Assert(g_pfnInitializeIpInterfaceEntry);
+
+    if (g_pfnInitializeIpInterfaceEntry)
+    {
+        g_pfnGetIpInterfaceEntry =
+            (PFNGETIPINTERFACEENTRY)GetProcAddress(pIpHlpInstance, "GetIpInterfaceEntry");
+        Assert(g_pfnGetIpInterfaceEntry);
+    }
+
+    if (g_pfnGetIpInterfaceEntry)
+    {
+        g_pfnSetIpInterfaceEntry =
+            (PFNSETIPINTERFACEENTRY)GetProcAddress(pIpHlpInstance, "SetIpInterfaceEntry");
+        Assert(g_pfnSetIpInterfaceEntry);
+    }
+
+    if (g_pfnInitializeIpInterfaceEntry == NULL)
+    {
+        FreeLibrary(pIpHlpInstance);
+        pIpHlpInstance = NULL;
+        return E_FAIL;
+    }
+
+    return S_OK;
+}
+
+
+HRESULT vboxNetCfgWinGetLoopbackMetric(OUT int* Metric)
+{
+    HRESULT rc = S_OK;
+    MIB_IPINTERFACE_ROW row;
+
+    Assert(g_pfnInitializeIpInterfaceEntry != NULL);
+    Assert(g_pfnGetIpInterfaceEntry != NULL);
+
+    g_pfnInitializeIpInterfaceEntry(&row);
+    row.Family = AF_INET;
+    row.InterfaceLuid.Info.IfType = IF_TYPE_SOFTWARE_LOOPBACK;
+
+    rc = g_pfnGetIpInterfaceEntry(&row);
+    if (rc != NO_ERROR)
+        return HRESULT_FROM_WIN32(rc);
+
+    *Metric = row.Metric;
+
+    return rc;
+}
+
+
+HRESULT vboxNetCfgWinSetInterfaceMetric(
+    IN NET_LUID* pInterfaceLuid,
+    IN DWORD metric)
+{
+    MIB_IPINTERFACE_ROW newRow;
+
+    Assert(g_pfnInitializeIpInterfaceEntry != NULL);
+    Assert(g_pfnSetIpInterfaceEntry != NULL);
+
+    g_pfnInitializeIpInterfaceEntry(&newRow);
+    // identificate the interface to change
+    newRow.InterfaceLuid = *pInterfaceLuid;
+    newRow.Family = AF_INET;
+    // changed settings
+    newRow.UseAutomaticMetric = false;
+    newRow.Metric = metric;
+
+    // change settings
+    return HRESULT_FROM_WIN32(g_pfnSetIpInterfaceEntry(&newRow));
+}
+
+
+HRESULT vboxNetCfgWinGetInterfaceLUID(IN HKEY hKey, OUT NET_LUID* pLUID)
+{
+    HRESULT res = S_OK;
+    DWORD luidIndex = 0;
+    DWORD ifType = 0;
+    DWORD cbSize = sizeof(luidIndex);
+    DWORD dwValueType = REG_DWORD;
+
+    if (pLUID == NULL)
+        return E_INVALIDARG;
+
+    res = RegQueryValueExW(hKey, L"NetLuidIndex", NULL,
+        &dwValueType, (LPBYTE)&luidIndex, &cbSize);
+    if (res != 0)
+        return HRESULT_FROM_WIN32(res);
+
+    cbSize = sizeof(ifType);
+    dwValueType = REG_DWORD;
+    res = RegQueryValueExW(hKey, L"*IfType", NULL,
+        &dwValueType, (LPBYTE)&ifType, &cbSize);
+    if (res != 0)
+        return HRESULT_FROM_WIN32(res);
+
+    ZeroMemory(pLUID, sizeof(NET_LUID));
+    pLUID->Info.IfType = ifType;
+    pLUID->Info.NetLuidIndex = luidIndex;
+
+    return res;
+}
+
+
+HRESULT vboxNetCfgWinSetupMetric(IN NET_LUID* pLuid)
+{
+    HINSTANCE hModule = NULL;
+    HRESULT rc = vboxLoadIpHelpFunctions(hModule);
+    if (SUCCEEDED(rc))
+    {
+        int loopbackMetric;
+        rc = vboxNetCfgWinGetLoopbackMetric(&loopbackMetric);
+        if (SUCCEEDED(rc))
+            rc = vboxNetCfgWinSetInterfaceMetric(pLuid, loopbackMetric - 1);
+    }
+
+    g_pfnInitializeIpInterfaceEntry = NULL;
+    g_pfnSetIpInterfaceEntry = NULL;
+    g_pfnGetIpInterfaceEntry = NULL;
+
+    FreeLibrary(hModule);
+    return rc;
+}
+#ifdef VBOXNETCFG_DELAYEDRENAME
+VBOXNETCFGWIN_DECL(HRESULT) VBoxNetCfgWinRenameHostOnlyConnection(IN const GUID *pGuid, IN LPCWSTR pwszId, OUT BSTR *pDevName)
+{
+    HRESULT hr = S_OK;
+    WCHAR wszDevName[256];
+    WCHAR wszConnectionNewName[128];
+    ULONG cbName = sizeof(wszConnectionNewName);
+
+    HDEVINFO hDevInfo = SetupDiCreateDeviceInfoList(&GUID_DEVCLASS_NET, NULL);
+    if (hDevInfo != INVALID_HANDLE_VALUE)
+    {
+        SP_DEVINFO_DATA DevInfoData;
+
+        DevInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
+        if (SetupDiOpenDeviceInfo(hDevInfo, pwszId, NULL, 0, &DevInfoData))
+        {
+            DWORD err = ERROR_SUCCESS;
+            if (!SetupDiGetDeviceRegistryPropertyW(hDevInfo, &DevInfoData,
+                                                   SPDRP_FRIENDLYNAME, NULL,
+                                                   (PBYTE)wszDevName, RT_ELEMENTS(wszDevName), NULL))
+            {
+                err = GetLastError();
+                if (err == ERROR_INVALID_DATA)
+                {
+                    err = SetupDiGetDeviceRegistryPropertyW(hDevInfo, &DevInfoData,
+                                                            SPDRP_DEVICEDESC, NULL,
+                                                            (PBYTE)wszDevName, RT_ELEMENTS(wszDevName), NULL)
+                        ? ERROR_SUCCESS
+                        : GetLastError();
+                }
+            }
+            if (err == ERROR_SUCCESS)
+            {
+                hr = VBoxNetCfgWinGenHostonlyConnectionName(wszDevName, wszConnectionNewName, &cbName);
+                if (SUCCEEDED(hr))
+                {
+                    WCHAR wszGuid[50];
+                    int cbWGuid = StringFromGUID2(*pGuid, wszGuid, RT_ELEMENTS(wszGuid));
+                    if (cbWGuid)
+                    {
+                        hr = VBoxNetCfgWinRenameConnection(wszGuid, wszConnectionNewName);
+                        if (FAILED(hr))
+                            NonStandardLogFlow(("VBoxNetCfgWinRenameHostOnlyConnection: VBoxNetCfgWinRenameConnection failed (0x%x)\n", hr));
+                    }
+                    else
+                    {
+                        err = GetLastError();
+                        hr = HRESULT_FROM_WIN32(err);
+                        if (SUCCEEDED(hr))
+                            hr = E_FAIL;
+                        NonStandardLogFlow(("StringFromGUID2 failed err=%u, hr=0x%x\n", err, hr));
+                    }
+                }
+                else
+                    NonStandardLogFlow(("VBoxNetCfgWinRenameHostOnlyConnection: VBoxNetCfgWinGenHostonlyConnectionName failed (0x%x)\n", hr));
+                if (SUCCEEDED(hr) && pDevName)
+                {
+                    *pDevName = SysAllocString((const OLECHAR *)wszDevName);
+                    if (!*pDevName)
+                    {
+                        NonStandardLogFlow(("SysAllocString failed\n"));
+                        hr = HRESULT_FROM_WIN32(ERROR_NOT_ENOUGH_MEMORY);
+                    }
+                }
+            }
+            else
+            {
+                hr = HRESULT_FROM_WIN32(err);
+                NonStandardLogFlow(("VBoxNetCfgWinRenameHostOnlyConnection: SetupDiGetDeviceRegistryPropertyW failed (0x%x)\n", err));
+            }
+        }
+        else
+        {
+            DWORD err = GetLastError();
+            hr = HRESULT_FROM_WIN32(err);
+            NonStandardLogFlow(("VBoxNetCfgWinRenameHostOnlyConnection: SetupDiOpenDeviceInfo failed (0x%x)\n", err));
+        }
+        SetupDiDestroyDeviceInfoList(hDevInfo);
+    }
+
+    return hr;
+}
+#endif /* VBOXNETCFG_DELAYEDRENAME */
+
+#undef SetErrBreak
+
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/drv/Makefile.kup b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/Makefile.kup
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/Makefile.kup
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetAdp.inf b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetAdp.inf
new file mode 100644
index 00000000..c3fe0d74
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetAdp.inf
@@ -0,0 +1,94 @@
+; $Id: VBoxNetAdp.inf $
+;; @file
+; VBoxNetAdp.inf - VirtualBox Host-Only Driver inf file
+;
+
+;
+; Copyright (C) 2011-2020 Oracle Corporation
+;
+; This file is part of VirtualBox Open Source Edition (OSE), as
+; available from http://www.virtualbox.org. This file is free software;
+; you can redistribute it and/or modify it under the terms of the GNU
+; General Public License (GPL) as published by the Free Software
+; Foundation, in version 2 as it comes in the "COPYING" file of the
+; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+;
+; The contents of this file may alternatively be used under the terms
+; of the Common Development and Distribution License Version 1.0
+; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+; VirtualBox OSE distribution, in which case the provisions of the
+; CDDL are applicable instead of those of the GPL.
+;
+; You may elect to license modified versions of this file under the
+; terms and conditions of either the GPL or the CDDL or both.
+;
+
+[Version]
+signature  = "$Windows NT$"
+;cat   CatalogFile = VBoxNetAdp.cat
+Class      = Net
+ClassGUID  = {4d36e972-e325-11ce-bfc1-08002be10318}
+Provider   = %Provider%
+; DriverPackageType=Network
+; DriverPackageDisplayName=%VBoxNetAdp_Desc%
+;edit-DriverVer=08/13/2008,1.1.0.1
+
+[ControlFlags]
+;ExcludeFromSelect = sun_VBoxNetAdp
+
+[SourceDisksNames]
+1=%DiskDescription%,"",,
+
+[SourceDisksFiles]
+VBoxNetAdp.sys=1
+
+[DestinationDirs]
+DefaultDestDir = 12
+VBoxNetAdp.Files.Sys   = 12   ; %windir%\System32\drivers
+
+[Manufacturer]
+%Provider% = VBox,NTx86,NTia64,NTamd64
+
+[VBox]
+%VBoxNetAdp_Desc% = VBoxNetAdp.ndi, sun_VBoxNetAdp
+
+[VBox.NTx86]
+%VBoxNetAdp_Desc% = VBoxNetAdp.ndi, sun_VBoxNetAdp
+
+[VBox.NTia64]
+%VBoxNetAdp_Desc% = VBoxNetAdp.ndi, sun_VBoxNetAdp
+
+[VBox.NTamd64]
+%VBoxNetAdp_Desc% = VBoxNetAdp.ndi, sun_VBoxNetAdp
+
+[VBoxNetAdp.ndi]
+Characteristics = 0x1 ; NCF_VIRTUAL
+CopyFiles = VBoxNetAdp.Files.Sys
+AddReg = VBoxNetAdp.AddReg
+
+[VBoxNetAdp.Files.Sys]
+VBoxNetAdp.sys,,,2
+
+[VBoxNetAdp.ndi.Services]
+AddService = VBoxNetAdp,0x2, VBoxNetAdp.AddService
+
+[VBoxNetAdp.AddService]
+DisplayName     = %VBoxNetAdp_Desc%
+ServiceType    = 1 ;SERVICE_KERNEL_DRIVER
+StartType      = 3 ;SERVICE_DEMAND_START
+ErrorControl   = 1 ;SERVICE_ERROR_NORMAL
+ServiceBinary  = %12%\VBoxNetAdp.sys
+LoadOrderGroup  = NDIS
+
+[VBoxNetAdp.AddReg]
+HKR,    ,                         *NdisDeviceType,     0x00010001, 1   ; NDIS_DEVICE_TYPE_ENDPOINT
+HKR, Ndi,                         Service,             0, "VBoxNetAdp"
+HKR, Ndi\Interfaces,              UpperRange,          0, "ndis5"
+HKR, Ndi\Interfaces,              LowerRange,          0, "ethernet"
+
+[Strings]
+Provider = "Oracle Corporation"
+VBoxNetAdp_Desc = "VirtualBox Host-Only Ethernet Adapter"
+DiskDescription = "VirtualBox Host-Only Ethernet Adapter"
+
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFlt-win.rc b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFlt-win.rc
new file mode 100644
index 00000000..eea1cb37
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFlt-win.rc
@@ -0,0 +1,67 @@
+/* $Id: VBoxNetFlt-win.rc $ */
+/** @file
+ * VBoxNetFlt - Resource file containing version info and icon.
+ */
+/*
+ * Copyright (C) 2011-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#include <windows.h>
+#include <VBox/version.h>
+
+#ifndef VBOXNETADP
+# define DESCRIPTION_STR    "VirtualBox Bridged Networking Driver\0"
+# define FILENAME_STR       "VBoxNetFlt"
+#else
+# define DESCRIPTION_STR    "VirtualBox Host-Only Network Adapter Driver\0"
+# define FILENAME_STR       "VBoxNetAdp"
+#endif
+
+LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
+
+VS_VERSION_INFO VERSIONINFO
+  FILEVERSION      VBOX_RC_FILE_VERSION
+  PRODUCTVERSION   VBOX_RC_FILE_VERSION
+  FILEFLAGSMASK    VS_FFI_FILEFLAGSMASK
+  FILEFLAGS        VBOX_RC_FILE_FLAGS
+  FILEOS           VBOX_RC_FILE_OS
+  FILETYPE         VBOX_RC_TYPE_DRV
+  FILESUBTYPE      VFT2_DRV_NETWORK
+BEGIN
+  BLOCK "StringFileInfo"
+  BEGIN
+    BLOCK "040904b0" // Lang=US English, CharSet=Unicode
+    BEGIN
+      VALUE "CompanyName",      VBOX_RC_COMPANY_NAME
+      VALUE "FileDescription",  DESCRIPTION_STR
+      VALUE "FileVersion",      VBOX_RC_FILE_VERSION_STR
+      VALUE "InternalName",     FILENAME_STR "\0"
+      VALUE "LegalCopyright",   VBOX_RC_LEGAL_COPYRIGHT
+      VALUE "OriginalFilename", FILENAME_STR ".sys\0"
+      VALUE "ProductName",      VBOX_RC_PRODUCT_NAME_STR
+      VALUE "ProductVersion",   VBOX_RC_PRODUCT_VERSION_STR
+      VBOX_RC_MORE_STRINGS
+    END
+  END
+  BLOCK "VarFileInfo"
+  BEGIN
+    VALUE "Translation", 0x409, 1200
+  END
+END
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFlt.inf b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFlt.inf
new file mode 100644
index 00000000..4ea8b285
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFlt.inf
@@ -0,0 +1,113 @@
+; $Id: VBoxNetFlt.inf $
+;; @file
+; VBoxNetFlt.inf - VirtualBox Bridged Networking Driver inf file Protocol edge
+;
+
+;
+; Copyright (C) 2011-2020 Oracle Corporation
+;
+; This file is part of VirtualBox Open Source Edition (OSE), as
+; available from http://www.virtualbox.org. This file is free software;
+; you can redistribute it and/or modify it under the terms of the GNU
+; General Public License (GPL) as published by the Free Software
+; Foundation, in version 2 as it comes in the "COPYING" file of the
+; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+;
+; The contents of this file may alternatively be used under the terms
+; of the Common Development and Distribution License Version 1.0
+; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+; VirtualBox OSE distribution, in which case the provisions of the
+; CDDL are applicable instead of those of the GPL.
+;
+; You may elect to license modified versions of this file under the
+; terms and conditions of either the GPL or the CDDL or both.
+;
+
+[Version]
+Signature  = "$Windows NT$"
+;cat   CatalogFile = VBoxNetFlt.cat
+Class      = NetService
+ClassGUID  = {4D36E974-E325-11CE-BFC1-08002BE10318}
+Provider   = %Provider%
+;DriverPackageType=Network
+;DriverPackageDisplayName=%VBoxNetFlt_Desc%
+;edit-DriverVer=08/13/2008,1.1.0.1
+
+
+[Manufacturer]
+%Provider% = VBox,NTx86,NTamd64
+
+[ControlFlags]
+
+[VBox]
+%VBoxNetFlt_Desc% = VBoxNetFlt.ndi, sun_VBoxNetFlt
+
+[VBox.NTx86]
+%VBoxNetFlt_Desc% = VBoxNetFlt.ndi, sun_VBoxNetFlt
+
+[VBox.NTamd64]
+%VBoxNetFlt_Desc% = VBoxNetFlt.ndi, sun_VBoxNetFlt
+
+[VBoxNetFlt.ndi]
+AddReg          = VBoxNetFlt.ndi.AddReg, VBoxNetFlt.AddReg
+Characteristics = 0x4410 ;  NCF_FILTER | NCF_NDIS_PROTOCOL
+CopyFiles       = VBoxNetFlt.Files.DLL, VBoxNetFlt.Files.Sys
+CopyInf         = VBoxNetFltM.inf
+
+[VBoxNetFlt.ndi.Remove]
+DelFiles        = VBoxNetFlt.Files.DLL, VBoxNetFlt.Files.Sys
+
+[VBoxNetFlt.ndi.Services]
+AddService = VBoxNetFlt,, VBoxNetFlt.AddService
+
+[VBoxNetFlt.AddService]
+DisplayName    = %VBoxNetFltService_Desc%
+ServiceType    = 1 ;SERVICE_KERNEL_DRIVER
+StartType      = 3 ;SERVICE_DEMAND_START
+ErrorControl   = 1 ;SERVICE_ERROR_NORMAL
+ServiceBinary  = %12%\VBoxNetFlt.sys
+LoadOrderGroup = PNP_TDI
+AddReg         = VBoxNetFlt.AddService.AddReg
+
+
+[VBoxNetFlt.AddService.AddReg]
+
+[SourceDisksNames]
+1=%DiskDescription%,"",,
+
+[SourceDisksFiles]
+VBoxNetFlt.sys=1
+VBoxNetFltNobj.dll=1
+
+[DestinationDirs]
+DefaultDestDir = 12
+VBoxNetFlt.Files.DLL   = 11   ; %windir%\System32
+VBoxNetFlt.Files.Sys   = 12   ; %windir%\System32\drivers
+
+[VBoxNetFlt.Files.Sys]
+VBoxNetFlt.sys,,,2
+
+[VBoxNetFlt.Files.DLL]
+VBoxNetFltNobj.dll,,,2
+
+[VBoxNetFlt.ndi.AddReg]
+HKR, Ndi, HelpText, , %VBoxNetFlt_HELP%
+HKR, Ndi,            ClsID,              0, {f374d1a0-bf08-4bdc-9cb2-c15ddaeef955}
+HKR, Ndi,            ComponentDll,        , VBoxNetFltNobj.dll
+HKR, Ndi,            FilterClass,         , failover
+HKR, Ndi,            FilterDeviceInfId,   , sun_VBoxNetFltmp
+HKR, Ndi,            Service,             , VBoxNetFlt
+HKR, Ndi\Interfaces, UpperRange,          , noupper
+HKR, Ndi\Interfaces, LowerRange,          , nolower
+HKR, Ndi\Interfaces, FilterMediaTypes,    , "ethernet, nolower"
+
+[VBoxNetFlt.AddReg]
+HKR, Parameters, Param1, 0, 4
+
+[Strings]
+Provider = "Oracle Corporation"
+DiskDescription = "VirtualBox Bridged Networking Driver"
+VBoxNetFlt_Desc = "VirtualBox Bridged Networking Driver"
+VBoxNetFlt_HELP = "VirtualBox Bridged Networking Driver"
+VBoxNetFltService_Desc = "VirtualBox Bridged Networking Service"
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFltCmn-win.h b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFltCmn-win.h
new file mode 100644
index 00000000..fd20ae64
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFltCmn-win.h
@@ -0,0 +1,523 @@
+/* $Id: VBoxNetFltCmn-win.h $ */
+/** @file
+ * VBoxNetFltCmn-win.h - Bridged Networking Driver, Windows Specific Code.
+ * Common header with configuration defines and global defs
+ */
+
+/*
+ * Copyright (C) 2011-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#ifndef VBOX_INCLUDED_SRC_VBoxNetFlt_win_drv_VBoxNetFltCmn_win_h
+#define VBOX_INCLUDED_SRC_VBoxNetFlt_win_drv_VBoxNetFltCmn_win_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#define LOG_GROUP LOG_GROUP_NET_FLT_DRV
+
+/* debugging flags */
+#ifdef DEBUG
+//# define DEBUG_NETFLT_PACKETS
+# ifndef DEBUG_misha
+#  define RT_NO_STRICT
+# endif
+/* # define DEBUG_NETFLT_LOOPBACK */
+/* receive logic has several branches */
+/* the DEBUG_NETFLT_RECV* macros used to debug the ProtocolReceive callback
+ * which is typically not used in case the underlying miniport indicates the packets with NdisMIndicateReceivePacket
+ * the best way to debug the ProtocolReceive (which in turn has several branches) is to enable the DEBUG_NETFLT_RECV
+ * one by one in the below order, i.e.
+ * first DEBUG_NETFLT_RECV
+ * then DEBUG_NETFLT_RECV + DEBUG_NETFLT_RECV_NOPACKET */
+//# define DEBUG_NETFLT_RECV
+//# define DEBUG_NETFLT_RECV_NOPACKET
+//# define DEBUG_NETFLT_RECV_TRANSFERDATA
+/* use ExAllocatePoolWithTag instead of NdisAllocateMemoryWithTag */
+// #define DEBUG_NETFLT_USE_EXALLOC
+#endif
+
+#include <VBox/intnet.h>
+#include <VBox/log.h>
+#include <VBox/err.h>
+#include <VBox/version.h>
+#include <iprt/initterm.h>
+#include <iprt/assert.h>
+#include <iprt/spinlock.h>
+#include <iprt/semaphore.h>
+#include <iprt/process.h>
+#include <iprt/alloc.h>
+#include <iprt/alloca.h>
+#include <iprt/time.h>
+#include <iprt/net.h>
+#include <iprt/list.h>
+
+#include <iprt/nt/ntddk.h>
+#include <iprt/nt/ndis.h>
+
+#define VBOXNETFLT_OS_SPECFIC 1
+
+/** version
+ * NOTE: we are NOT using NDIS 5.1 features now */
+#ifdef NDIS51_MINIPORT
+# define VBOXNETFLT_VERSION_MP_NDIS_MAJOR     5
+# define VBOXNETFLT_VERSION_MP_NDIS_MINOR     1
+#else
+# define VBOXNETFLT_VERSION_MP_NDIS_MAJOR     5
+# define VBOXNETFLT_VERSION_MP_NDIS_MINOR     0
+#endif
+
+#ifndef VBOXNETADP
+#ifdef NDIS51
+# define VBOXNETFLT_VERSION_PT_NDIS_MAJOR     5
+# define VBOXNETFLT_VERSION_PT_NDIS_MINOR     1 /* todo: use 0 here as well ? */
+#else
+# define VBOXNETFLT_VERSION_PT_NDIS_MAJOR     5
+# define VBOXNETFLT_VERSION_PT_NDIS_MINOR     0
+#endif
+
+# define VBOXNETFLT_NAME_PROTOCOL             L"VBoxNetFlt"
+/** device to be used to prevent the driver unload & ioctl interface (if necessary in the future) */
+# define VBOXNETFLT_NAME_LINK                 L"\\DosDevices\\Global\\VBoxNetFlt"
+# define VBOXNETFLT_NAME_DEVICE               L"\\Device\\VBoxNetFlt"
+#else
+# define VBOXNETFLT_NAME_LINK                 L"\\DosDevices\\Global\\VBoxNetAdp"
+# define VBOXNETFLT_NAME_DEVICE               L"\\Device\\VBoxNetAdp"
+#endif
+
+typedef struct VBOXNETFLTINS *PVBOXNETFLTINS;
+
+/** configuration */
+
+/** Ndis Packet pool settings
+ * these are applied to both receive and send packet pools */
+/* number of packets for normal used */
+#define VBOXNETFLT_PACKET_POOL_SIZE_NORMAL    0x000000FF
+/* number of additional overflow packets */
+#define VBOXNETFLT_PACKET_POOL_SIZE_OVERFLOW  0x0000FF00
+
+/** packet queue size used when the driver is working in the "active" mode */
+#define VBOXNETFLT_PACKET_INFO_POOL_SIZE      0x0000FFFF
+
+#ifndef VBOXNETADP
+/** memory tag used for memory allocations
+ * (VBNF stands for VBox NetFlt) */
+# define VBOXNETFLT_MEM_TAG                   'FNBV'
+#else
+/** memory tag used for memory allocations
+ * (VBNA stands for VBox NetAdp) */
+# define VBOXNETFLT_MEM_TAG                   'ANBV'
+#endif
+
+/** receive and transmit Ndis buffer pool size */
+#define VBOXNETFLT_BUFFER_POOL_SIZE_TX        128
+#define VBOXNETFLT_BUFFER_POOL_SIZE_RX        128
+
+#define VBOXNETFLT_PACKET_ETHEADER_SIZE       14
+#define VBOXNETFLT_PACKET_HEADER_MATCH_SIZE   24
+#define VBOXNETFLT_PACKET_QUEUE_SG_SEGS_ALLOC 32
+
+
+#if defined(DEBUG_NETFLT_PACKETS) || !defined(VBOX_LOOPBACK_USEFLAGS)
+# define VBOXNETFLT_PACKETMATCH_LENGTH        (VBOXNETFLT_PACKET_ETHEADER_SIZE + 2)
+#endif
+
+#ifdef VBOXNETADP
+#define VBOXNETADP_HEADER_SIZE                14
+#define VBOXNETADP_MAX_DATA_SIZE              1500
+#define VBOXNETADP_MAX_PACKET_SIZE            (VBOXNETADP_HEADER_SIZE + VBOXNETADP_MAX_DATA_SIZE)
+#define VBOXNETADP_MIN_PACKET_SIZE            60
+/* link speed 100Mbps (measured in 100 bps) */
+#define     VBOXNETADP_LINK_SPEED             1000000
+#define VBOXNETADP_MAX_LOOKAHEAD_SIZE         VBOXNETADP_MAX_DATA_SIZE
+#define VBOXNETADP_VENDOR_ID 0x080027
+#define VBOXNETADP_VENDOR_DRIVER_VERSION      0x00010000
+#define VBOXNETADP_VENDOR_DESC                "Sun"
+#define VBOXNETADP_MAX_MCAST_LIST             32
+#define VBOXNETADP_ETH_ADDRESS_LENGTH         6
+
+//#define VBOXNETADP_REPORT_DISCONNECTED
+#endif
+/* type defs */
+
+/** Flag specifying that the type of enqueued packet
+ * if set the info contains the PINTNETSG packet
+ * if clear the packet info contains the PNDIS_PACKET packet
+ * Typically the packet queue we are maintaining contains PNDIS_PACKETs only,
+ * however in case the underlying miniport indicates a packet with the NDIS_STATUS_RESOURCES status
+ * we MUST return the packet back to the miniport immediately
+ * this is why we are creating the INTNETSG, copying the ndis packet info there and enqueueing it */
+#define VBOXNETFLT_PACKET_SG                  0x00000001
+
+/** the flag specifying that the packet source
+ * if set the packet comes from the host (upperlying protocol)
+ * if clear the packet comes from the wire (underlying miniport) */
+#define VBOXNETFLT_PACKET_SRC_HOST            0x00000002
+
+#ifndef VBOXNETFLT_NO_PACKET_QUEUE
+/** flag specifying the packet was originated by our driver
+ * i.e. we could use it on our needs and should not return it
+ * we are enqueueing "our" packets on ProtocolReceive call-back when
+ * Ndis does not give us a receive packet (the driver below us has called NdisM..IndicateReceive)
+ * this is supported for Ndis Packet only */
+#define VBOXNETFLT_PACKET_MINE                0x00000004
+
+/** flag passed to vboxNetFltWinQuEnqueuePacket specifying that the packet should be copied
+ * this is supported for Ndis Packet only */
+#define VBOXNETFLT_PACKET_COPY                0x00000008
+#endif
+
+/** packet queue element containing the packet info */
+typedef struct VBOXNETFLT_PACKET_INFO
+{
+    /** list entry used for enqueueing the info */
+    LIST_ENTRY ListEntry;
+    /** pointer to the pool containing this packet info */
+    struct VBOXNETFLT_PACKET_INFO_POOL *pPool;
+    /** flags describing the referenced packet. Contains PACKET_xxx flags (i.e. PACKET_SG, PACKET_SRC_HOST) */
+    uint32_t fFlags;
+    /** pointer to the packet this info represents */
+    PVOID pPacket;
+} VBOXNETFLT_PACKET_INFO, *PVBOXNETFLT_PACKET_INFO;
+
+/* paranoid check to make sure the elements in the packet info array are properly aligned */
+AssertCompile((sizeof(VBOXNETFLT_PACKET_INFO) & (sizeof(PVOID) - 1)) == 0);
+
+/** represents the packet queue */
+typedef LIST_ENTRY PVBOXNETFLT_ACKET_QUEUE, *PVBOXNETFLT_PACKET_QUEUE;
+
+/*
+ * we are using non-interlocked versions of LIST_ENTRY-related operations macros and synchronize
+ * access to the queue and its elements by acquiring/releasing a spinlock using Ndis[Acquire,Release]Spinlock
+ *
+ * we are NOT using interlocked versions of insert/remove head/tail list functions because we need to iterate though
+ * the queue elements as well as remove elements from the midle of the queue
+ *
+ * * @todo: it seems that we can switch to using interlocked versions of list-entry functions
+ * since we have removed all functionality (mentioned above, i.e. queue elements iteration, etc.) that might prevent us from doing this
+ */
+typedef struct VBOXNETFLT_INTERLOCKED_PACKET_QUEUE
+{
+    /** queue */
+    PVBOXNETFLT_ACKET_QUEUE Queue;
+    /** queue lock */
+    NDIS_SPIN_LOCK Lock;
+} VBOXNETFLT_INTERLOCKED_PACKET_QUEUE, *PVBOXNETFLT_INTERLOCKED_PACKET_QUEUE;
+
+typedef struct VBOXNETFLT_SINGLE_LIST
+{
+    /** queue */
+    SINGLE_LIST_ENTRY Head;
+    /** pointer to the list tail. used to enqueue elements to the tail of the list */
+    PSINGLE_LIST_ENTRY pTail;
+} VBOXNETFLT_SINGLE_LIST, *PVBOXNETFLT_SINGLE_LIST;
+
+typedef struct VBOXNETFLT_INTERLOCKED_SINGLE_LIST
+{
+    /** queue */
+    VBOXNETFLT_SINGLE_LIST List;
+    /** queue lock */
+    NDIS_SPIN_LOCK Lock;
+} VBOXNETFLT_INTERLOCKED_SINGLE_LIST, *PVBOXNETFLT_INTERLOCKED_SINGLE_LIST;
+
+/** packet info pool contains free packet info elements to be used for the packet queue
+ * we are using the pool mechanism to allocate packet queue elements
+ * the pool mechanism is pretty simple now, we are allocating a bunch of memory
+ * for maintaining VBOXNETFLT_PACKET_INFO_POOL_SIZE queue elements and just returning null when the pool is exhausted
+ * This mechanism seems to be enough for now since we are using VBOXNETFLT_PACKET_INFO_POOL_SIZE = 0xffff which is
+ * the maximum size of packets the ndis packet pool supports */
+typedef struct VBOXNETFLT_PACKET_INFO_POOL
+{
+    /** free packet info queue */
+    VBOXNETFLT_INTERLOCKED_PACKET_QUEUE Queue;
+    /** memory bugger used by the pool */
+    PVOID pBuffer;
+} VBOXNETFLT_PACKET_INFO_POOL, *PVBOXNETFLT_PACKET_INFO_POOL;
+
+typedef enum VBOXNETDEVOPSTATE
+{
+    kVBoxNetDevOpState_InvalidValue = 0,
+    kVBoxNetDevOpState_Initializing,
+    kVBoxNetDevOpState_Initialized,
+    kVBoxNetDevOpState_Deinitializing,
+    kVBoxNetDevOpState_Deinitialized,
+
+} VBOXNETDEVOPSTATE;
+
+typedef enum VBOXNETFLT_WINIFSTATE
+{
+   /** The usual invalid state. */
+    kVBoxWinIfState_Invalid = 0,
+    /** Initialization. */
+    kVBoxWinIfState_Connecting,
+    /** Connected fuly functional state */
+    kVBoxWinIfState_Connected,
+    /** Disconnecting  */
+    kVBoxWinIfState_Disconnecting,
+    /** Disconnected  */
+    kVBoxWinIfState_Disconnected,
+} VBOXNETFLT_WINIFSTATE;
+
+/** structure used to maintain the state and reference count of the miniport and protocol */
+typedef struct VBOXNETFLT_WINIF_DEVICE
+{
+    /** initialize state */
+    VBOXNETDEVOPSTATE OpState;
+    /** ndis power state */
+    NDIS_DEVICE_POWER_STATE PowerState;
+    /** reference count */
+    uint32_t cReferences;
+} VBOXNETFLT_WINIF_DEVICE, *PVBOXNETFLT_WINIF_DEVICE;
+
+#define VBOXNDISREQUEST_INPROGRESS  1
+#define VBOXNDISREQUEST_QUEUED      2
+
+typedef struct VBOXNETFLTWIN_STATE
+{
+    union
+    {
+        struct
+        {
+            UINT fRequestInfo : 2;
+            UINT fInterfaceClosing : 1;
+            UINT fStandBy : 1;
+            UINT fProcessingPacketFilter : 1;
+            UINT fPPFNetFlt : 1;
+            UINT fUpperProtSetFilterInitialized : 1;
+            UINT Reserved : 25;
+        };
+        UINT Value;
+    };
+} VBOXNETFLTWIN_STATE, *PVBOXNETFLTWIN_STATE;
+
+DECLINLINE(VBOXNETFLTWIN_STATE) vboxNetFltWinAtomicUoReadWinState(VBOXNETFLTWIN_STATE State)
+{
+    UINT fValue = ASMAtomicUoReadU32((volatile uint32_t *)&State.Value);
+    return *((PVBOXNETFLTWIN_STATE)((void*)&fValue));
+}
+
+/* miniport layer globals */
+typedef struct VBOXNETFLTGLOBALS_MP
+{
+    /** our miniport handle */
+    NDIS_HANDLE hMiniport;
+    /** ddis wrapper handle */
+    NDIS_HANDLE hNdisWrapper;
+} VBOXNETFLTGLOBALS_MP, *PVBOXNETFLTGLOBALS_MP;
+
+#ifndef VBOXNETADP
+/* protocol layer globals */
+typedef struct VBOXNETFLTGLOBALS_PT
+{
+    /** our protocol handle */
+    NDIS_HANDLE hProtocol;
+} VBOXNETFLTGLOBALS_PT, *PVBOXNETFLTGLOBALS_PT;
+#endif /* #ifndef VBOXNETADP */
+
+typedef struct VBOXNETFLTGLOBALS_WIN
+{
+    /** synch event used for device creation synchronization */
+    KEVENT SynchEvent;
+    /** Device reference count */
+    int cDeviceRefs;
+    /** ndis device */
+    NDIS_HANDLE hDevice;
+    /** device object */
+    PDEVICE_OBJECT pDevObj;
+    /* loopback flags */
+    /* ndis packet flags to disable packet loopback */
+    UINT fPacketDontLoopBack;
+    /* ndis packet flags specifying whether the packet is looped back */
+    UINT fPacketIsLoopedBack;
+    /* Minport info */
+    VBOXNETFLTGLOBALS_MP Mp;
+#ifndef VBOXNETADP
+    /* Protocol info */
+    VBOXNETFLTGLOBALS_PT Pt;
+    /** lock protecting the filter list */
+    NDIS_SPIN_LOCK lockFilters;
+    /** the head of filter list */
+    RTLISTANCHOR listFilters;
+    /** IP address change notifier handle */
+    HANDLE hNotifier;
+#endif
+} VBOXNETFLTGLOBALS_WIN, *PVBOXNETFLTGLOBALS_WIN;
+
+extern VBOXNETFLTGLOBALS_WIN g_VBoxNetFltGlobalsWin;
+
+/** represents filter driver device context*/
+typedef struct VBOXNETFLTWIN
+{
+    /** handle used by miniport edge for ndis calls */
+    NDIS_HANDLE hMiniport;
+    /** miniport edge state */
+    VBOXNETFLT_WINIF_DEVICE MpState;
+    /** ndis packet pool used for receives */
+    NDIS_HANDLE hRecvPacketPool;
+    /** ndis buffer pool used for receives */
+    NDIS_HANDLE hRecvBufferPool;
+    /** driver bind adapter state. */
+    VBOXNETFLT_WINIFSTATE enmState;
+#ifndef VBOXNETADP
+    /* misc state flags */
+    VBOXNETFLTWIN_STATE StateFlags;
+    /** handle used by protocol edge for ndis calls */
+    NDIS_HANDLE hBinding;
+    /** protocol edge state */
+    VBOXNETFLT_WINIF_DEVICE PtState;
+    /** ndis packet pool used for receives */
+    NDIS_HANDLE hSendPacketPool;
+    /** ndis buffer pool used for receives */
+    NDIS_HANDLE hSendBufferPool;
+    /** used for maintaining the pending send packets for handling packet loopback */
+    VBOXNETFLT_INTERLOCKED_SINGLE_LIST SendPacketQueue;
+    /** used for serializing calls to the NdisRequest in the vboxNetFltWinSynchNdisRequest */
+    RTSEMFASTMUTEX hSynchRequestMutex;
+    /** event used to synchronize with the Ndis Request completion in the vboxNetFltWinSynchNdisRequest */
+    KEVENT hSynchCompletionEvent;
+    /** status of the Ndis Request initiated by the vboxNetFltWinSynchNdisRequest */
+    NDIS_STATUS volatile SynchCompletionStatus;
+    /** pointer to the Ndis Request being executed by the vboxNetFltWinSynchNdisRequest */
+    PNDIS_REQUEST volatile pSynchRequest;
+    /** open/close adapter status.
+     * Since ndis adapter open and close requests may complete asynchronously,
+     * we are using event mechanism to wait for open/close completion
+     * the status field is being set by the completion call-back */
+    NDIS_STATUS OpenCloseStatus;
+    /** open/close adaptor completion event */
+    NDIS_EVENT OpenCloseEvent;
+    /** medium we are attached to */
+    NDIS_MEDIUM enmMedium;
+    /**
+     * Passdown request info
+     */
+    /** ndis request we pass down to the miniport below */
+    NDIS_REQUEST PassDownRequest;
+    /** Ndis pass down request bytes read or written original pointer */
+    PULONG pcPDRBytesRW;
+    /** Ndis pass down request bytes needed original pointer */
+    PULONG pcPDRBytesNeeded;
+    /** true if we should indicate the receive complete used by the ProtocolReceive mechanism.
+     * We need to indicate it only with the ProtocolReceive + NdisMEthIndicateReceive path.
+     * Note: we're using KeGetCurrentProcessorNumber, which is not entirely correct in case
+     * we're running on 64bit win7+, which can handle > 64 CPUs, however since KeGetCurrentProcessorNumber
+     * always returns the number < than the number of CPUs in the first group, we're guaranteed to have CPU index < 64
+     * @todo: use KeGetCurrentProcessorNumberEx for Win7+ 64 and dynamically extended array */
+    bool abIndicateRxComplete[64];
+    /** Pending transfer data packet queue (i.e. packets that were indicated as pending on NdisTransferData call */
+    VBOXNETFLT_INTERLOCKED_SINGLE_LIST TransferDataList;
+    /* mac options initialized on OID_GEN_MAC_OPTIONS */
+    ULONG fMacOptions;
+    /** our miniport devuice name */
+    NDIS_STRING MpDeviceName;
+    /** synchronize with unbind with Miniport initialization */
+    NDIS_EVENT MpInitCompleteEvent;
+    /** media connect status that we indicated */
+    NDIS_STATUS MpIndicatedMediaStatus;
+    /** media connect status pending to indicate */
+    NDIS_STATUS MpUnindicatedMediaStatus;
+    /** packet filter flags set by the upper protocols */
+    ULONG fUpperProtocolSetFilter;
+    /** packet filter flags set by the upper protocols */
+    ULONG fSetFilterBuffer;
+    /** packet filter flags set by us */
+    ULONG fOurSetFilter;
+    /** our own list of filters, needed by notifier */
+    RTLISTNODE node;
+#else
+    volatile ULONG cTxSuccess;
+    volatile ULONG cRxSuccess;
+    volatile ULONG cTxError;
+    volatile ULONG cRxError;
+#endif
+} VBOXNETFLTWIN, *PVBOXNETFLTWIN;
+
+typedef struct VBOXNETFLT_PACKET_QUEUE_WORKER
+{
+    /** this event is used to initiate a packet queue worker thread kill */
+    KEVENT KillEvent;
+    /** this event is used to notify a worker thread that the packets are added to the queue */
+    KEVENT NotifyEvent;
+    /** pointer to the packet queue worker thread object */
+    PKTHREAD pThread;
+    /** pointer to the SG used by the packet queue for IntNet receive notifications */
+    PINTNETSG pSG;
+    /** Packet queue */
+    VBOXNETFLT_INTERLOCKED_PACKET_QUEUE PacketQueue;
+    /** Packet info pool, i.e. the pool for the packet queue elements */
+    VBOXNETFLT_PACKET_INFO_POOL PacketInfoPool;
+} VBOXNETFLT_PACKET_QUEUE_WORKER, *PVBOXNETFLT_PACKET_QUEUE_WORKER;
+
+/* protocol reserved data held in ndis packet */
+typedef struct VBOXNETFLT_PKTRSVD_PT
+{
+    /** original packet received from the upperlying protocol
+     * can be null if the packet was originated by intnet */
+    PNDIS_PACKET pOrigPacket;
+    /** pointer to the buffer to be freed on send completion
+     * can be null if no buffer is to be freed */
+    PVOID pBufToFree;
+#if !defined(VBOX_LOOPBACK_USEFLAGS) || defined(DEBUG_NETFLT_PACKETS)
+    SINGLE_LIST_ENTRY ListEntry;
+    /* true if the packet is from IntNet */
+    bool bFromIntNet;
+#endif
+} VBOXNETFLT_PKTRSVD_PT, *PVBOXNETFLT_PKTRSVD_PT;
+
+/** miniport reserved data held in ndis packet */
+typedef struct VBOXNETFLT_PKTRSVD_MP
+{
+    /** original packet received from the underling miniport
+     * can be null if the packet was originated by intnet */
+    PNDIS_PACKET pOrigPacket;
+    /** pointer to the buffer to be freed on receive completion
+     * can be null if no buffer is to be freed */
+    PVOID pBufToFree;
+} VBOXNETFLT_PKTRSVD_MP, *PVBOXNETFLT_PKTRSVD_MP;
+
+/** represents the data stored in the protocol reserved field of ndis packet on NdisTransferData processing */
+typedef struct VBOXNETFLT_PKTRSVD_TRANSFERDATA_PT
+{
+    /** next packet in a list */
+    SINGLE_LIST_ENTRY ListEntry;
+    /* packet buffer start */
+    PNDIS_BUFFER pOrigBuffer;
+} VBOXNETFLT_PKTRSVD_TRANSFERDATA_PT, *PVBOXNETFLT_PKTRSVD_TRANSFERDATA_PT;
+
+/* VBOXNETFLT_PKTRSVD_TRANSFERDATA_PT should fit into PROTOCOL_RESERVED_SIZE_IN_PACKET because we use protocol reserved part
+ * of our miniport edge on transfer data processing for honding our own info */
+AssertCompile(sizeof (VBOXNETFLT_PKTRSVD_TRANSFERDATA_PT) <= PROTOCOL_RESERVED_SIZE_IN_PACKET);
+/* this should fit in MiniportReserved */
+AssertCompile(sizeof (VBOXNETFLT_PKTRSVD_MP) <= RT_SIZEOFMEMB(NDIS_PACKET, MiniportReserved));
+/* we use RTAsmAtomic*U32 for those, make sure we're correct */
+AssertCompile(sizeof (NDIS_DEVICE_POWER_STATE) == sizeof (uint32_t));
+AssertCompile(sizeof (UINT) == sizeof (uint32_t));
+
+
+#define NDIS_FLAGS_SKIP_LOOPBACK_W2K    0x400
+
+#include "../../VBoxNetFltInternal.h"
+#include "VBoxNetFltRt-win.h"
+#ifndef VBOXNETADP
+# include "VBoxNetFltP-win.h"
+#endif
+#include "VBoxNetFltM-win.h"
+
+#endif /* !VBOX_INCLUDED_SRC_VBoxNetFlt_win_drv_VBoxNetFltCmn_win_h */
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFltM-win.cpp b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFltM-win.cpp
new file mode 100644
index 00000000..f857c30a
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFltM-win.cpp
@@ -0,0 +1,1560 @@
+/* $Id: VBoxNetFltM-win.cpp $ */
+/** @file
+ * VBoxNetFltM-win.cpp - Bridged Networking Driver, Windows Specific Code.
+ * Miniport edge
+ */
+/*
+ * Copyright (C) 2011-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+#include "VBoxNetFltCmn-win.h"
+
+static const char* vboxNetFltWinMpDumpOid(ULONG oid);
+
+#ifndef VBOXNETADP
+static NDIS_STATUS vboxNetFltWinMpInitialize(OUT PNDIS_STATUS OpenErrorStatus,
+        OUT PUINT SelectedMediumIndex,
+        IN PNDIS_MEDIUM MediumArray,
+        IN UINT MediumArraySize,
+        IN NDIS_HANDLE MiniportAdapterHandle,
+        IN NDIS_HANDLE WrapperConfigurationContext)
+{
+    RT_NOREF1(WrapperConfigurationContext);
+    PVBOXNETFLTINS pNetFlt = (PVBOXNETFLTINS)NdisIMGetDeviceContext(MiniportAdapterHandle);
+    NDIS_STATUS Status = NDIS_STATUS_FAILURE;
+
+    LogFlowFunc(("ENTER: pNetFlt (0x%p)\n", pNetFlt));
+
+    pNetFlt->u.s.WinIf.hMiniport = MiniportAdapterHandle;
+    Assert(vboxNetFltWinGetOpState(&pNetFlt->u.s.WinIf.MpState) == kVBoxNetDevOpState_Initializing);
+    /* the MP state should be already set to kVBoxNetDevOpState_Initializing, just a paranoia
+     * in case NDIS for some reason calls us in some irregular way */
+    vboxNetFltWinSetOpState(&pNetFlt->u.s.WinIf.MpState, kVBoxNetDevOpState_Initializing);
+
+    NDIS_MEDIUM enmMedium = pNetFlt->u.s.WinIf.enmMedium;
+    if (enmMedium == NdisMediumWan)
+        enmMedium = NdisMedium802_3;
+
+    UINT i = 0;
+    for (; i < MediumArraySize; i++)
+    {
+        if (MediumArray[i] == enmMedium)
+        {
+            *SelectedMediumIndex = i;
+            break;
+        }
+    }
+
+    do
+    {
+        if (i != MediumArraySize)
+        {
+            NdisMSetAttributesEx(MiniportAdapterHandle, pNetFlt, 0,
+                                     NDIS_ATTRIBUTE_IGNORE_PACKET_TIMEOUT    |
+                                     NDIS_ATTRIBUTE_IGNORE_REQUEST_TIMEOUT|
+                                     NDIS_ATTRIBUTE_INTERMEDIATE_DRIVER |
+                                     NDIS_ATTRIBUTE_DESERIALIZE |
+                                     NDIS_ATTRIBUTE_NO_HALT_ON_SUSPEND,
+                                     NdisInterfaceInternal /* 0 */);
+
+            pNetFlt->u.s.WinIf.MpIndicatedMediaStatus = NDIS_STATUS_MEDIA_CONNECT;
+            Assert(vboxNetFltWinGetPowerState(&pNetFlt->u.s.WinIf.MpState) == NdisDeviceStateD3);
+            vboxNetFltWinSetPowerState(&pNetFlt->u.s.WinIf.MpState, NdisDeviceStateD0);
+            Assert(pNetFlt->u.s.WinIf.MpState.OpState == kVBoxNetDevOpState_Initializing);
+            vboxNetFltWinSetOpState(&pNetFlt->u.s.WinIf.MpState, kVBoxNetDevOpState_Initialized);
+
+            Status = NDIS_STATUS_SUCCESS;
+            break;
+        }
+        else
+        {
+            Status = NDIS_STATUS_UNSUPPORTED_MEDIA;
+        }
+
+        Assert(Status != NDIS_STATUS_SUCCESS);
+        Assert(vboxNetFltWinGetPowerState(&pNetFlt->u.s.WinIf.MpState) == NdisDeviceStateD3);
+        Assert(pNetFlt->u.s.WinIf.MpState.OpState == kVBoxNetDevOpState_Initializing);
+        vboxNetFltWinSetOpState(&pNetFlt->u.s.WinIf.MpState, kVBoxNetDevOpState_Deinitialized);
+    } while (0);
+
+    NdisSetEvent(&pNetFlt->u.s.WinIf.MpInitCompleteEvent);
+
+    LogFlowFunc(("LEAVE: pNetFlt (0x%p), Status (0x%x)\n", pNetFlt, Status));
+
+    *OpenErrorStatus = Status;
+
+    return Status;
+}
+
+/**
+ * process the packet send in a "passthru" mode
+ */
+static NDIS_STATUS vboxNetFltWinSendPassThru(PVBOXNETFLTINS pNetFlt, PNDIS_PACKET pPacket
+#ifdef VBOXNETFLT_NO_PACKET_QUEUE
+    , bool bNetFltActive
+#endif
+    )
+{
+    PNDIS_PACKET pMyPacket;
+    NDIS_STATUS Status = vboxNetFltWinPrepareSendPacket(pNetFlt, pPacket, &pMyPacket);
+    Assert(Status == NDIS_STATUS_SUCCESS);
+    if (Status == NDIS_STATUS_SUCCESS)
+    {
+#if !defined(VBOX_LOOPBACK_USEFLAGS) /* || defined(DEBUG_NETFLT_PACKETS) */
+# ifdef VBOXNETFLT_NO_PACKET_QUEUE
+        if (bNetFltActive)
+            vboxNetFltWinLbPutSendPacket(pNetFlt, pMyPacket, false /* bFromIntNet */);
+# else
+        /* no need for the loop enqueue & check in a passthru mode , ndis will do everything for us */
+# endif
+#endif
+        NdisSend(&Status, pNetFlt->u.s.WinIf.hBinding, pMyPacket);
+        if (Status != NDIS_STATUS_PENDING)
+        {
+            NdisIMCopySendCompletePerPacketInfo(pPacket, pMyPacket);
+#if defined(VBOXNETFLT_NO_PACKET_QUEUE) && !defined(VBOX_LOOPBACK_USEFLAGS)
+        if (bNetFltActive)
+            vboxNetFltWinLbRemoveSendPacket(pNetFlt, pMyPacket);
+#endif
+            NdisFreePacket(pMyPacket);
+        }
+    }
+    return Status;
+}
+
+#else /* defined VBOXNETADP */
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinMpDoDeinitialization(PVBOXNETFLTINS pNetFlt)
+{
+    uint64_t NanoTS = RTTimeSystemNanoTS();
+
+    Assert(vboxNetFltWinGetOpState(&pNetFlt->u.s.WinIf.MpState) == kVBoxNetDevOpState_Initialized);
+
+    RTSpinlockAcquire(pNetFlt->hSpinlock);
+    ASMAtomicUoWriteBool(&pNetFlt->fDisconnectedFromHost, true);
+    ASMAtomicUoWriteBool(&pNetFlt->fRediscoveryPending, false);
+    ASMAtomicUoWriteU64(&pNetFlt->NanoTSLastRediscovery, NanoTS);
+
+    vboxNetFltWinSetOpState(&pNetFlt->u.s.WinIf.MpState, kVBoxNetDevOpState_Deinitializing);
+
+    RTSpinlockRelease(pNetFlt->hSpinlock);
+
+    vboxNetFltWinWaitDereference(&pNetFlt->u.s.WinIf.MpState);
+
+    /* check packet pool is empty */
+    int cPPUsage = NdisPacketPoolUsage(pNetFlt->u.s.WinIf.hRecvPacketPool);
+    Assert(cPPUsage == 0);
+    /* for debugging only, ignore the err in release */
+    NOREF(cPPUsage);
+
+    vboxNetFltWinSetOpState(&pNetFlt->u.s.WinIf.MpState, kVBoxNetDevOpState_Deinitialized);
+
+    return NDIS_STATUS_SUCCESS;
+}
+
+static NDIS_STATUS vboxNetFltWinMpReadApplyConfig(PVBOXNETFLTINS pThis, NDIS_HANDLE hMiniportAdapter,
+                                                  NDIS_HANDLE hWrapperConfigurationContext)
+{
+    RT_NOREF1(hMiniportAdapter);
+    NDIS_STATUS Status = NDIS_STATUS_SUCCESS;
+    NDIS_HANDLE hConfiguration;
+    PNDIS_CONFIGURATION_PARAMETER pParameterValue;
+    NDIS_STRING strMAC = NDIS_STRING_CONST("MAC");
+    RTMAC mac;
+
+    NdisOpenConfiguration(
+        &Status,
+        &hConfiguration,
+        hWrapperConfigurationContext);
+    Assert(Status == NDIS_STATUS_SUCCESS);
+    if (Status == NDIS_STATUS_SUCCESS)
+    {
+        do
+        {
+            int rc;
+            NDIS_CONFIGURATION_PARAMETER param;
+            WCHAR MacBuf[13];
+
+            NdisReadConfiguration(&Status,
+                                  &pParameterValue,
+                                  hConfiguration,
+                                  &strMAC,
+                                  NdisParameterString);
+//            Assert(Status == NDIS_STATUS_SUCCESS);
+            if (Status == NDIS_STATUS_SUCCESS)
+            {
+
+                rc = vboxNetFltWinMACFromNdisString(&mac, &pParameterValue->ParameterData.StringData);
+                AssertRC(rc);
+                if (RT_SUCCESS(rc))
+                {
+                    break;
+                }
+            }
+
+            vboxNetFltWinGenerateMACAddress(&mac);
+            param.ParameterType = NdisParameterString;
+            param.ParameterData.StringData.Buffer = MacBuf;
+            param.ParameterData.StringData.MaximumLength = sizeof(MacBuf);
+
+            rc = vboxNetFltWinMAC2NdisString(&mac, &param.ParameterData.StringData);
+            Assert(RT_SUCCESS(rc));
+            if (RT_SUCCESS(rc))
+            {
+                NdisWriteConfiguration(&Status,
+                        hConfiguration,
+                        &strMAC,
+                        &param);
+                Assert(Status == NDIS_STATUS_SUCCESS);
+                if (Status != NDIS_STATUS_SUCCESS)
+                {
+                    /* ignore the failure */
+                    Status = NDIS_STATUS_SUCCESS;
+                }
+            }
+        } while (0);
+
+        NdisCloseConfiguration(hConfiguration);
+    }
+    else
+    {
+        vboxNetFltWinGenerateMACAddress(&mac);
+    }
+
+    pThis->u.s.MacAddr = mac;
+
+    return NDIS_STATUS_SUCCESS;
+}
+
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinMpDoInitialization(PVBOXNETFLTINS pNetFlt, NDIS_HANDLE hMiniportAdapter, NDIS_HANDLE hWrapperConfigurationContext)
+{
+    NDIS_STATUS Status;
+    pNetFlt->u.s.WinIf.hMiniport = hMiniportAdapter;
+
+    LogFlowFunc(("ENTER: pNetFlt 0x%p\n", pNetFlt));
+
+    Assert(vboxNetFltWinGetOpState(&pNetFlt->u.s.WinIf.MpState) == kVBoxNetDevOpState_Deinitialized);
+    vboxNetFltWinSetOpState(&pNetFlt->u.s.WinIf.MpState, kVBoxNetDevOpState_Initializing);
+
+    vboxNetFltWinMpReadApplyConfig(pNetFlt, hMiniportAdapter, hWrapperConfigurationContext);
+
+    NdisMSetAttributesEx(hMiniportAdapter, pNetFlt,
+                            0, /* CheckForHangTimeInSeconds */
+                            NDIS_ATTRIBUTE_DESERIALIZE |
+                            NDIS_ATTRIBUTE_NO_HALT_ON_SUSPEND,
+                            NdisInterfaceInternal/* 0 */);
+
+    Assert(vboxNetFltWinGetPowerState(&pNetFlt->u.s.WinIf.MpState) == NdisDeviceStateD3);
+    vboxNetFltWinSetPowerState(&pNetFlt->u.s.WinIf.MpState, NdisDeviceStateD0);
+    Assert(vboxNetFltWinGetOpState(&pNetFlt->u.s.WinIf.MpState) == kVBoxNetDevOpState_Initializing);
+    vboxNetFltWinSetOpState(&pNetFlt->u.s.WinIf.MpState, kVBoxNetDevOpState_Initialized);
+
+    Status = NDIS_STATUS_SUCCESS;
+
+    LogFlowFunc(("pNetFlt 0x%p, Status 0x%x\n", pNetFlt, Status));
+
+    return Status;
+}
+
+static NDIS_STATUS vboxNetFltWinMpInitialize(OUT PNDIS_STATUS OpenErrorStatus,
+                        OUT PUINT SelectedMediumIndex,
+                        IN PNDIS_MEDIUM MediumArray,
+                        IN UINT MediumArraySize,
+                        IN NDIS_HANDLE MiniportAdapterHandle,
+                        IN NDIS_HANDLE WrapperConfigurationContext)
+{
+
+    NDIS_STATUS Status = NDIS_STATUS_FAILURE;
+    UINT i = 0;
+
+    LogFlowFuncEnter();
+
+    for (; i < MediumArraySize; i++)
+    {
+        if (MediumArray[i] == NdisMedium802_3)
+        {
+            *SelectedMediumIndex = i;
+            break;
+        }
+    }
+
+    if (i != MediumArraySize)
+    {
+        PDEVICE_OBJECT pPdo, pFdo;
+#define KEY_PREFIX L"\\Registry\\Machine\\System\\CurrentControlSet\\Control\\Class\\"
+        UCHAR Buf[512];
+        PUCHAR pSuffix;
+        ULONG cbBuf;
+        NDIS_STRING RtlStr;
+
+        wcscpy((WCHAR*)Buf, KEY_PREFIX);
+        pSuffix = Buf + (sizeof(KEY_PREFIX)-2);
+
+        NdisMGetDeviceProperty(MiniportAdapterHandle,
+                           &pPdo,
+                           &pFdo,
+                           NULL, //Next Device Object
+                           NULL,
+                           NULL);
+
+        Status = IoGetDeviceProperty (pPdo,
+                                      DevicePropertyDriverKeyName,
+                                      sizeof(Buf) - (sizeof(KEY_PREFIX)-2),
+                                      pSuffix,
+                                      &cbBuf);
+        if (Status == STATUS_SUCCESS)
+        {
+            OBJECT_ATTRIBUTES ObjAttr;
+            HANDLE hDrvKey;
+            RtlStr.Buffer=(WCHAR*)Buf;
+            RtlStr.Length=(USHORT)cbBuf - 2 + sizeof(KEY_PREFIX) - 2;
+            RtlStr.MaximumLength=sizeof(Buf);
+
+            InitializeObjectAttributes(&ObjAttr, &RtlStr, OBJ_CASE_INSENSITIVE, NULL, NULL);
+
+            Status = ZwOpenKey(&hDrvKey, KEY_READ, &ObjAttr);
+            if (Status == STATUS_SUCCESS)
+            {
+                static UNICODE_STRING NetCfgInstanceIdValue = NDIS_STRING_CONST("NetCfgInstanceId");
+//                UCHAR valBuf[sizeof(KEY_VALUE_PARTIAL_INFORMATION) + RTUUID_STR_LENGTH*2 + 10];
+//                ULONG cLength = sizeof(valBuf);
+#define NAME_PREFIX L"\\DEVICE\\"
+                PKEY_VALUE_PARTIAL_INFORMATION pInfo = (PKEY_VALUE_PARTIAL_INFORMATION)Buf;
+                Status = ZwQueryValueKey(hDrvKey,
+                            &NetCfgInstanceIdValue,
+                            KeyValuePartialInformation,
+                            pInfo,
+                            sizeof(Buf),
+                            &cbBuf);
+                if (Status == STATUS_SUCCESS)
+                {
+                    if (pInfo->Type == REG_SZ && pInfo->DataLength > 2)
+                    {
+                        WCHAR *pName;
+                        Status = vboxNetFltWinMemAlloc((PVOID*)&pName, pInfo->DataLength + sizeof(NAME_PREFIX));
+                        if (Status == STATUS_SUCCESS)
+                        {
+                            PVBOXNETFLTINS pNetFlt;
+                            wcscpy(pName, NAME_PREFIX);
+                            wcscpy(pName+(sizeof(NAME_PREFIX)-2)/2, (WCHAR*)pInfo->Data);
+                            RtlStr.Buffer=pName;
+                            RtlStr.Length = (USHORT)pInfo->DataLength - 2 + sizeof(NAME_PREFIX) - 2;
+                            RtlStr.MaximumLength = (USHORT)pInfo->DataLength + sizeof(NAME_PREFIX);
+
+                            Status = vboxNetFltWinPtInitBind(&pNetFlt, MiniportAdapterHandle, &RtlStr, WrapperConfigurationContext);
+
+                            if (Status == STATUS_SUCCESS)
+                            {
+                                Assert(vboxNetFltWinGetOpState(&pNetFlt->u.s.WinIf.MpState) == kVBoxNetDevOpState_Initialized);
+                                vboxNetFltWinSetOpState(&pNetFlt->u.s.WinIf.MpState, kVBoxNetDevOpState_Initialized);
+#if 0
+                                NdisMIndicateStatus(pNetFlt->u.s.WinIf.hMiniport,
+                                                         NDIS_STATUS_MEDIA_CONNECT,
+                                                         (PVOID)NULL,
+                                                         0);
+#endif
+                            }
+                            else
+                            {
+                                Assert(vboxNetFltWinGetOpState(&pNetFlt->u.s.WinIf.MpState) == kVBoxNetDevOpState_Deinitialized);
+                                vboxNetFltWinSetOpState(&pNetFlt->u.s.WinIf.MpState, kVBoxNetDevOpState_Deinitialized);
+                            }
+
+                            vboxNetFltWinMemFree(pName);
+
+                        }
+                    }
+                    else
+                    {
+                        Status = NDIS_STATUS_FAILURE;
+                    }
+                }
+            }
+        }
+    }
+    else
+    {
+        Status = NDIS_STATUS_UNSUPPORTED_MEDIA;
+    }
+
+    /** @todo */
+    *OpenErrorStatus = Status;
+
+    LogFlowFunc(("LEAVE: Status (0x%x)\n", Status));
+
+    return Status;
+}
+#endif
+
+static VOID vboxNetFltWinMpSendPackets(IN NDIS_HANDLE hMiniportAdapterContext,
+        IN PPNDIS_PACKET pPacketArray,
+        IN UINT cNumberOfPackets)
+{
+    PVBOXNETFLTINS pNetFlt = (PVBOXNETFLTINS)hMiniportAdapterContext;
+    NDIS_STATUS Status = NDIS_STATUS_SUCCESS;
+    bool bNetFltActive;
+
+    LogFlowFunc(("ENTER: pNetFlt (0x%p)\n", pNetFlt));
+
+    Assert(cNumberOfPackets);
+
+    if (vboxNetFltWinIncReferenceWinIfNetFlt(pNetFlt, cNumberOfPackets, &bNetFltActive))
+    {
+        uint32_t cAdaptRefs = cNumberOfPackets;
+        uint32_t cNetFltRefs;
+        uint32_t cPassThruRefs;
+        if (bNetFltActive)
+        {
+            cNetFltRefs = cNumberOfPackets;
+            cPassThruRefs = 0;
+        }
+        else
+        {
+            cPassThruRefs = cNumberOfPackets;
+            cNetFltRefs = 0;
+        }
+
+        for (UINT i = 0; i < cNumberOfPackets; i++)
+        {
+            PNDIS_PACKET pPacket;
+
+            pPacket = pPacketArray[i];
+
+            if (!cNetFltRefs
+#ifdef VBOXNETFLT_NO_PACKET_QUEUE
+                    || !vboxNetFltWinPostIntnet(pNetFlt, pPacket, VBOXNETFLT_PACKET_SRC_HOST)
+#else
+                    || (fStatus = vboxNetFltWinQuEnqueuePacket(pNetFlt, pPacket, VBOXNETFLT_PACKET_SRC_HOST)) != NDIS_STATUS_SUCCESS
+#endif
+                    )
+            {
+#ifndef VBOXNETADP
+                Status = vboxNetFltWinSendPassThru(pNetFlt, pPacket
+#ifdef VBOXNETFLT_NO_PACKET_QUEUE
+                               , !!cNetFltRefs
+#endif
+                        );
+#else
+                if (!cNetFltRefs)
+                {
+# ifdef VBOXNETADP_REPORT_DISCONNECTED
+                    Status = NDIS_STATUS_MEDIA_DISCONNECT;
+                    STATISTIC_INCREASE(pNetFlt->u.s.WinIf.cTxError);
+# else
+                    Status = NDIS_STATUS_SUCCESS;
+# endif
+                }
+#endif
+
+                if (Status != NDIS_STATUS_PENDING)
+                {
+                    NdisMSendComplete(pNetFlt->u.s.WinIf.hMiniport, pPacket, Status);
+                }
+                else
+                {
+                    cAdaptRefs--;
+                }
+            }
+            else
+            {
+#ifdef VBOXNETFLT_NO_PACKET_QUEUE
+                NdisMSendComplete(pNetFlt->u.s.WinIf.hMiniport, pPacket, NDIS_STATUS_SUCCESS);
+#else
+                cAdaptRefs--;
+                cNetFltRefs--;
+#endif
+            }
+        }
+
+        if (cNetFltRefs)
+        {
+            vboxNetFltWinDecReferenceNetFlt(pNetFlt, cNetFltRefs);
+        }
+        else if (cPassThruRefs)
+        {
+            vboxNetFltWinDecReferenceModePassThru(pNetFlt, cPassThruRefs);
+        }
+        if (cAdaptRefs)
+        {
+            vboxNetFltWinDecReferenceWinIf(pNetFlt, cAdaptRefs);
+        }
+    }
+    else
+    {
+        NDIS_HANDLE h = pNetFlt->u.s.WinIf.hMiniport;
+        AssertFailed();
+        if (h)
+        {
+            for (UINT i = 0; i < cNumberOfPackets; i++)
+            {
+                PNDIS_PACKET pPacket;
+                pPacket = pPacketArray[i];
+                NdisMSendComplete(h, pPacket, NDIS_STATUS_FAILURE);
+            }
+        }
+    }
+
+    LogFlowFunc(("LEAVE: pNetFlt (0x%p)\n", pNetFlt));
+}
+
+#ifndef VBOXNETADP
+static UINT vboxNetFltWinMpRequestStatePrep(PVBOXNETFLTINS pNetFlt, NDIS_STATUS *pStatus)
+{
+    Assert(!pNetFlt->u.s.WinIf.StateFlags.fRequestInfo);
+
+    if (vboxNetFltWinGetOpState(&pNetFlt->u.s.WinIf.PtState) > kVBoxNetDevOpState_Initialized /* protocol unbind in progress */
+            || vboxNetFltWinGetPowerState(&pNetFlt->u.s.WinIf.MpState) > NdisDeviceStateD0)
+    {
+        *pStatus = NDIS_STATUS_FAILURE;
+        return 0;
+    }
+
+    RTSpinlockAcquire(pNetFlt->hSpinlock);
+    Assert(!pNetFlt->u.s.WinIf.StateFlags.fRequestInfo);
+    if (vboxNetFltWinGetOpState(&pNetFlt->u.s.WinIf.PtState) > kVBoxNetDevOpState_Initialized /* protocol unbind in progress */
+            || vboxNetFltWinGetPowerState(&pNetFlt->u.s.WinIf.MpState) > NdisDeviceStateD0)
+    {
+        RTSpinlockRelease(pNetFlt->hSpinlock);
+        *pStatus = NDIS_STATUS_FAILURE;
+        return 0;
+    }
+
+    if ((vboxNetFltWinGetPowerState(&pNetFlt->u.s.WinIf.PtState) > NdisDeviceStateD0)
+            && !pNetFlt->u.s.WinIf.StateFlags.fStandBy)
+    {
+        pNetFlt->u.s.WinIf.StateFlags.fRequestInfo = VBOXNDISREQUEST_INPROGRESS | VBOXNDISREQUEST_QUEUED;
+        RTSpinlockRelease(pNetFlt->hSpinlock);
+        *pStatus = NDIS_STATUS_PENDING;
+        return VBOXNDISREQUEST_INPROGRESS | VBOXNDISREQUEST_QUEUED;
+    }
+
+    if (pNetFlt->u.s.WinIf.StateFlags.fStandBy)
+    {
+        RTSpinlockRelease(pNetFlt->hSpinlock);
+        *pStatus = NDIS_STATUS_FAILURE;
+        return 0;
+    }
+
+    pNetFlt->u.s.WinIf.StateFlags.fRequestInfo = VBOXNDISREQUEST_INPROGRESS;
+
+    RTSpinlockRelease(pNetFlt->hSpinlock);
+
+    *pStatus = NDIS_STATUS_SUCCESS;
+    return VBOXNDISREQUEST_INPROGRESS;
+}
+
+static NDIS_STATUS vboxNetFltWinMpRequestPostQuery(PVBOXNETFLTINS pNetFlt)
+{
+    if (pNetFlt->u.s.WinIf.PassDownRequest.DATA.QUERY_INFORMATION.Oid == OID_GEN_CURRENT_PACKET_FILTER && VBOXNETFLT_PROMISCUOUS_SUPPORTED(pNetFlt))
+    {
+        bool fNetFltActive;
+        const bool fWinIfActive = vboxNetFltWinReferenceWinIfNetFlt(pNetFlt, &fNetFltActive);
+
+        Assert(pNetFlt->u.s.WinIf.PassDownRequest.DATA.QUERY_INFORMATION.InformationBuffer);
+        Assert(!pNetFlt->u.s.WinIf.StateFlags.fProcessingPacketFilter);
+
+        if (fNetFltActive)
+        {
+            /* netflt is active, simply return the cached value */
+            *((PULONG)pNetFlt->u.s.WinIf.PassDownRequest.DATA.QUERY_INFORMATION.InformationBuffer) = pNetFlt->u.s.WinIf.fUpperProtocolSetFilter;
+
+            /* we've intercepted the query and completed it */
+            vboxNetFltWinMpRequestStateComplete(pNetFlt);
+
+            vboxNetFltWinDereferenceNetFlt(pNetFlt);
+            vboxNetFltWinDereferenceWinIf(pNetFlt);
+
+            return NDIS_STATUS_SUCCESS;
+        }
+        else if (fWinIfActive)
+        {
+            pNetFlt->u.s.WinIf.StateFlags.fProcessingPacketFilter = 1;
+            pNetFlt->u.s.WinIf.StateFlags.fPPFNetFlt = 0;
+            /* we're cleaning it in RequestComplete */
+        }
+    }
+
+    NDIS_STATUS Status;
+    /* issue the request */
+    NdisRequest(&Status, pNetFlt->u.s.WinIf.hBinding, &pNetFlt->u.s.WinIf.PassDownRequest);
+    if (Status != NDIS_STATUS_PENDING)
+    {
+        vboxNetFltWinPtRequestComplete(pNetFlt, &pNetFlt->u.s.WinIf.PassDownRequest, Status);
+        Status = NDIS_STATUS_PENDING;
+    }
+
+    return Status;
+}
+
+static NDIS_STATUS vboxNetFltWinMpQueryInformation(IN NDIS_HANDLE MiniportAdapterContext,
+        IN NDIS_OID Oid,
+        IN PVOID InformationBuffer,
+        IN ULONG InformationBufferLength,
+        OUT PULONG BytesWritten,
+        OUT PULONG BytesNeeded)
+{
+    PVBOXNETFLTINS pNetFlt = (PVBOXNETFLTINS)MiniportAdapterContext;
+    NDIS_STATUS Status = NDIS_STATUS_FAILURE;
+
+    LogFlowFunc(("ENTER: pNetFlt (0x%p), Oid (%s)\n", pNetFlt, vboxNetFltWinMpDumpOid(Oid)));
+
+    /* fist check if this is the oid we want to pass down */
+    switch (Oid)
+    {
+        case OID_PNP_QUERY_POWER:
+            Status = NDIS_STATUS_SUCCESS;
+            break;
+        case OID_TCP_TASK_OFFLOAD:
+        case OID_GEN_SUPPORTED_GUIDS:
+            Status = NDIS_STATUS_NOT_SUPPORTED;
+            break;
+        default:
+        {
+            /* the oid is to be passed down,
+             * check the device state if we can do it
+             * and update device state accordingly */
+            UINT uOp = vboxNetFltWinMpRequestStatePrep(pNetFlt, &Status);
+            if (uOp)
+            {
+                /* save the request info */
+                pNetFlt->u.s.WinIf.PassDownRequest.RequestType = NdisRequestQueryInformation;
+                pNetFlt->u.s.WinIf.PassDownRequest.DATA.QUERY_INFORMATION.Oid = Oid;
+                pNetFlt->u.s.WinIf.PassDownRequest.DATA.QUERY_INFORMATION.InformationBuffer = InformationBuffer;
+                pNetFlt->u.s.WinIf.PassDownRequest.DATA.QUERY_INFORMATION.InformationBufferLength = InformationBufferLength;
+                pNetFlt->u.s.WinIf.pcPDRBytesNeeded = BytesNeeded;
+                pNetFlt->u.s.WinIf.pcPDRBytesRW = BytesWritten;
+
+                /* the oid can be processed */
+                if (!(uOp & VBOXNDISREQUEST_QUEUED))
+                {
+                    Status = vboxNetFltWinMpRequestPostQuery(pNetFlt);
+                }
+            }
+            break;
+        }
+    }
+
+    LogFlowFunc(("LEAVE: pNetFlt (0x%p), Oid (%s), Status (0x%x)\n", pNetFlt, vboxNetFltWinMpDumpOid(Oid), Status));
+
+    return Status;
+}
+
+#endif /* ifndef VBOXNETADP*/
+
+static NDIS_STATUS vboxNetFltWinMpHandlePowerState(PVBOXNETFLTINS pNetFlt, NDIS_DEVICE_POWER_STATE enmState)
+{
+    if (vboxNetFltWinGetPowerState(&pNetFlt->u.s.WinIf.MpState) > NdisDeviceStateD0
+            && enmState != NdisDeviceStateD0)
+    {
+        /* invalid state transformation */
+        AssertFailed();
+        return NDIS_STATUS_FAILURE;
+    }
+
+#ifndef VBOXNETADP
+    if (vboxNetFltWinGetPowerState(&pNetFlt->u.s.WinIf.MpState) == NdisDeviceStateD0
+            && enmState > NdisDeviceStateD0)
+    {
+        pNetFlt->u.s.WinIf.StateFlags.fStandBy = TRUE;
+    }
+
+    if (vboxNetFltWinGetPowerState(&pNetFlt->u.s.WinIf.MpState) > NdisDeviceStateD0
+            && enmState == NdisDeviceStateD0)
+    {
+        pNetFlt->u.s.WinIf.StateFlags.fStandBy = FALSE;
+    }
+#endif
+
+    vboxNetFltWinSetPowerState(&pNetFlt->u.s.WinIf.MpState, enmState);
+
+#ifndef VBOXNETADP
+    if (pNetFlt->u.s.WinIf.StateFlags.fStandBy == FALSE)
+    {
+        if (pNetFlt->u.s.WinIf.MpIndicatedMediaStatus != pNetFlt->u.s.WinIf.MpUnindicatedMediaStatus)
+        {
+           NdisMIndicateStatus(pNetFlt->u.s.WinIf.hMiniport, pNetFlt->u.s.WinIf.MpUnindicatedMediaStatus, NULL, 0);
+           NdisMIndicateStatusComplete(pNetFlt->u.s.WinIf.hMiniport);
+           pNetFlt->u.s.WinIf.MpIndicatedMediaStatus = pNetFlt->u.s.WinIf.MpUnindicatedMediaStatus;
+        }
+    }
+    else
+    {
+        pNetFlt->u.s.WinIf.MpUnindicatedMediaStatus = pNetFlt->u.s.WinIf.MpIndicatedMediaStatus;
+    }
+#endif
+
+    return NDIS_STATUS_SUCCESS;
+}
+
+#ifndef VBOXNETADP
+static NDIS_STATUS vboxNetFltWinMpRequestPostSet(PVBOXNETFLTINS pNetFlt)
+{
+    if (pNetFlt->u.s.WinIf.PassDownRequest.DATA.SET_INFORMATION.Oid == OID_GEN_CURRENT_PACKET_FILTER && VBOXNETFLT_PROMISCUOUS_SUPPORTED(pNetFlt))
+    {
+        /* need to disable cleaning promiscuous here ?? */
+        bool fNetFltActive;
+        const bool fWinIfActive = vboxNetFltWinReferenceWinIfNetFlt(pNetFlt, &fNetFltActive);
+
+        Assert(pNetFlt->u.s.WinIf.PassDownRequest.DATA.SET_INFORMATION.InformationBuffer);
+        Assert(!pNetFlt->u.s.WinIf.StateFlags.fProcessingPacketFilter);
+
+        if (fNetFltActive)
+        {
+            Assert(fWinIfActive);
+
+            /* netflt is active, update the cached value */
+            /** @todo in case we are are not in promiscuous now, we are issuing a request.
+             * what should we do in case of a failure?
+             * i.e. should we update the fUpperProtocolSetFilter in completion routine in this case? etc. */
+            pNetFlt->u.s.WinIf.fUpperProtocolSetFilter = *((PULONG)pNetFlt->u.s.WinIf.PassDownRequest.DATA.SET_INFORMATION.InformationBuffer);
+            pNetFlt->u.s.WinIf.StateFlags.fUpperProtSetFilterInitialized = TRUE;
+
+            if (!(pNetFlt->u.s.WinIf.fOurSetFilter & NDIS_PACKET_TYPE_PROMISCUOUS))
+            {
+                pNetFlt->u.s.WinIf.fSetFilterBuffer = NDIS_PACKET_TYPE_PROMISCUOUS;
+                pNetFlt->u.s.WinIf.PassDownRequest.DATA.SET_INFORMATION.InformationBuffer = &pNetFlt->u.s.WinIf.fSetFilterBuffer;
+                pNetFlt->u.s.WinIf.PassDownRequest.DATA.SET_INFORMATION.InformationBufferLength = sizeof (pNetFlt->u.s.WinIf.fSetFilterBuffer);
+                pNetFlt->u.s.WinIf.StateFlags.fProcessingPacketFilter = 1;
+                pNetFlt->u.s.WinIf.StateFlags.fPPFNetFlt = 1;
+                /* we'll do dereferencing in request complete */
+            }
+            else
+            {
+                vboxNetFltWinDereferenceNetFlt(pNetFlt);
+                vboxNetFltWinDereferenceWinIf(pNetFlt);
+
+                /* we've intercepted the query and completed it */
+                vboxNetFltWinMpRequestStateComplete(pNetFlt);
+                return NDIS_STATUS_SUCCESS;
+            }
+        }
+        else if (fWinIfActive)
+        {
+            pNetFlt->u.s.WinIf.StateFlags.fProcessingPacketFilter = 1;
+            pNetFlt->u.s.WinIf.StateFlags.fPPFNetFlt = 0;
+            /* dereference on completion */
+        }
+    }
+
+    NDIS_STATUS Status;
+
+    NdisRequest(&Status, pNetFlt->u.s.WinIf.hBinding, &pNetFlt->u.s.WinIf.PassDownRequest);
+    if (Status != NDIS_STATUS_PENDING)
+    {
+        vboxNetFltWinPtRequestComplete(pNetFlt, &pNetFlt->u.s.WinIf.PassDownRequest, Status);
+    }
+
+    return Status;
+}
+
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinMpRequestPost(PVBOXNETFLTINS pNetFlt)
+{
+    switch (pNetFlt->u.s.WinIf.PassDownRequest.RequestType)
+    {
+        case NdisRequestQueryInformation:
+            return vboxNetFltWinMpRequestPostQuery(pNetFlt);
+        case NdisRequestSetInformation:
+            return vboxNetFltWinMpRequestPostSet(pNetFlt);
+        default:
+            AssertBreakpoint();
+            return NDIS_STATUS_FAILURE;
+    }
+}
+
+static NDIS_STATUS vboxNetFltWinMpSetInformation(IN NDIS_HANDLE MiniportAdapterContext,
+        IN NDIS_OID Oid,
+        IN PVOID InformationBuffer,
+        IN ULONG InformationBufferLength,
+        OUT PULONG BytesRead,
+        OUT PULONG BytesNeeded)
+{
+    PVBOXNETFLTINS pNetFlt = (PVBOXNETFLTINS)MiniportAdapterContext;
+    NDIS_STATUS Status = NDIS_STATUS_FAILURE;
+
+    LogFlowFunc(("ENTER: pNetFlt (0x%p), Oid (%s)\n", pNetFlt, vboxNetFltWinMpDumpOid(Oid)));
+
+    switch (Oid)
+    {
+        case OID_PNP_SET_POWER:
+        {
+            if (InformationBufferLength >= sizeof (NDIS_DEVICE_POWER_STATE))
+            {
+                NDIS_DEVICE_POWER_STATE *penmState = (NDIS_DEVICE_POWER_STATE*)InformationBuffer;
+                Status = vboxNetFltWinMpHandlePowerState(pNetFlt, *penmState);
+            }
+            else
+            {
+                Status = NDIS_STATUS_INVALID_LENGTH;
+            }
+
+            if (Status == NDIS_STATUS_SUCCESS)
+            {
+                *BytesRead = sizeof (NDIS_DEVICE_POWER_STATE);
+                *BytesNeeded = 0;
+            }
+            else
+            {
+                *BytesRead = 0;
+                *BytesNeeded = sizeof (NDIS_DEVICE_POWER_STATE);
+            }
+            break;
+        }
+        default:
+        {
+            /* the oid is to be passed down,
+             * check the device state if we can do it
+             * and update device state accordingly */
+            UINT uOp = vboxNetFltWinMpRequestStatePrep(pNetFlt, &Status);
+            if (uOp)
+            {
+                /* save the request info */
+                pNetFlt->u.s.WinIf.PassDownRequest.RequestType = NdisRequestSetInformation;
+                pNetFlt->u.s.WinIf.PassDownRequest.DATA.SET_INFORMATION.Oid = Oid;
+                pNetFlt->u.s.WinIf.PassDownRequest.DATA.SET_INFORMATION.InformationBuffer = InformationBuffer;
+                pNetFlt->u.s.WinIf.PassDownRequest.DATA.SET_INFORMATION.InformationBufferLength = InformationBufferLength;
+                pNetFlt->u.s.WinIf.pcPDRBytesNeeded = BytesNeeded;
+                pNetFlt->u.s.WinIf.pcPDRBytesRW = BytesRead;
+
+                /* the oid can be processed */
+                if (!(uOp & VBOXNDISREQUEST_QUEUED))
+                {
+                    Status = vboxNetFltWinMpRequestPostSet(pNetFlt);
+                }
+            }
+            break;
+        }
+    }
+
+    LogFlowFunc(("LEAVE: pNetFlt (0x%p), Oid (%s), Status (0x%x)\n", pNetFlt, vboxNetFltWinMpDumpOid(Oid), Status));
+
+    return Status;
+}
+#else
+static NDIS_OID g_vboxNetFltWinMpSupportedOids[] =
+{
+    OID_GEN_SUPPORTED_LIST,
+    OID_GEN_HARDWARE_STATUS,
+    OID_GEN_MEDIA_SUPPORTED,
+    OID_GEN_MEDIA_IN_USE,
+    OID_GEN_MAXIMUM_LOOKAHEAD,
+    OID_GEN_CURRENT_LOOKAHEAD,
+    OID_GEN_MAXIMUM_FRAME_SIZE,
+    OID_GEN_MAXIMUM_TOTAL_SIZE,
+    OID_GEN_TRANSMIT_BLOCK_SIZE,
+    OID_GEN_RECEIVE_BLOCK_SIZE,
+    OID_GEN_MAC_OPTIONS,
+    OID_GEN_LINK_SPEED,
+    OID_GEN_TRANSMIT_BUFFER_SPACE,
+    OID_GEN_RECEIVE_BUFFER_SPACE,
+    OID_GEN_VENDOR_ID,
+    OID_GEN_VENDOR_DESCRIPTION,
+    OID_GEN_VENDOR_DRIVER_VERSION,
+    OID_GEN_DRIVER_VERSION,
+    OID_GEN_MAXIMUM_SEND_PACKETS,
+    OID_GEN_MEDIA_CONNECT_STATUS,
+    OID_GEN_CURRENT_PACKET_FILTER,
+    OID_PNP_CAPABILITIES,
+    OID_PNP_QUERY_POWER,
+    OID_GEN_XMIT_OK,
+    OID_GEN_RCV_OK,
+    OID_GEN_XMIT_ERROR,
+    OID_GEN_RCV_ERROR,
+    OID_GEN_RCV_NO_BUFFER,
+    OID_GEN_RCV_CRC_ERROR,
+    OID_GEN_TRANSMIT_QUEUE_LENGTH,
+    OID_PNP_SET_POWER,
+    OID_802_3_PERMANENT_ADDRESS,
+    OID_802_3_CURRENT_ADDRESS,
+    OID_802_3_MULTICAST_LIST,
+    OID_802_3_MAC_OPTIONS,
+    OID_802_3_MAXIMUM_LIST_SIZE,
+    OID_802_3_RCV_ERROR_ALIGNMENT,
+    OID_802_3_XMIT_ONE_COLLISION,
+    OID_802_3_XMIT_MORE_COLLISIONS,
+    OID_802_3_XMIT_DEFERRED,
+    OID_802_3_XMIT_MAX_COLLISIONS,
+    OID_802_3_RCV_OVERRUN,
+    OID_802_3_XMIT_UNDERRUN,
+    OID_802_3_XMIT_HEARTBEAT_FAILURE,
+    OID_802_3_XMIT_TIMES_CRS_LOST,
+    OID_802_3_XMIT_LATE_COLLISIONS,
+};
+
+static NDIS_STATUS vboxNetFltWinMpQueryInformation(IN NDIS_HANDLE MiniportAdapterContext,
+        IN NDIS_OID Oid,
+        IN PVOID InformationBuffer,
+        IN ULONG InformationBufferLength,
+        OUT PULONG BytesWritten,
+        OUT PULONG BytesNeeded)
+{
+    /* static data */
+    static const NDIS_HARDWARE_STATUS enmHwStatus = NdisHardwareStatusReady;
+    static const NDIS_MEDIUM enmMedium = NdisMedium802_3;
+    static NDIS_PNP_CAPABILITIES PnPCaps = {0};
+    static BOOLEAN bPnPCapsInited = FALSE;
+
+    PVBOXNETFLTINS pNetFlt = (PVBOXNETFLTINS)MiniportAdapterContext;
+    NDIS_STATUS Status = NDIS_STATUS_SUCCESS;
+    ULONG64 u64Info = 0;
+    ULONG u32Info = 0;
+    USHORT u16Info = 0;
+    /* default is 4bytes */
+    const void* pvInfo = (void*)&u32Info;
+    ULONG cbInfo = sizeof (u32Info);
+
+    LogFlowFunc(("ENTER: pNetFlt (0x%p), Oid (%s)\n", pNetFlt, vboxNetFltWinMpDumpOid(Oid)));
+
+    *BytesWritten = 0;
+    *BytesNeeded = 0;
+
+    switch (Oid)
+    {
+        case OID_GEN_SUPPORTED_LIST:
+            pvInfo = g_vboxNetFltWinMpSupportedOids;
+            cbInfo = sizeof (g_vboxNetFltWinMpSupportedOids);
+            break;
+
+        case OID_GEN_HARDWARE_STATUS:
+            pvInfo = &enmHwStatus;
+            cbInfo = sizeof (NDIS_HARDWARE_STATUS);
+            break;
+
+        case OID_GEN_MEDIA_SUPPORTED:
+        case OID_GEN_MEDIA_IN_USE:
+            pvInfo = &enmMedium;
+            cbInfo = sizeof (NDIS_MEDIUM);
+            break;
+
+        case OID_GEN_MAXIMUM_LOOKAHEAD:
+        case OID_GEN_CURRENT_LOOKAHEAD:
+            u32Info = VBOXNETADP_MAX_LOOKAHEAD_SIZE;
+            break;
+
+        case OID_GEN_MAXIMUM_FRAME_SIZE:
+            u32Info = VBOXNETADP_MAX_PACKET_SIZE - VBOXNETADP_HEADER_SIZE;
+            break;
+
+        case OID_GEN_MAXIMUM_TOTAL_SIZE:
+        case OID_GEN_TRANSMIT_BLOCK_SIZE:
+        case OID_GEN_RECEIVE_BLOCK_SIZE:
+            u32Info = VBOXNETADP_MAX_PACKET_SIZE;
+            break;
+
+        case OID_GEN_MAC_OPTIONS:
+            u32Info = NDIS_MAC_OPTION_COPY_LOOKAHEAD_DATA |
+                        NDIS_MAC_OPTION_TRANSFERS_NOT_PEND |
+                        NDIS_MAC_OPTION_NO_LOOPBACK;
+            break;
+
+        case OID_GEN_LINK_SPEED:
+            u32Info = VBOXNETADP_LINK_SPEED;
+            break;
+
+        case OID_GEN_TRANSMIT_BUFFER_SPACE:
+        case OID_GEN_RECEIVE_BUFFER_SPACE:
+            u32Info = VBOXNETADP_MAX_PACKET_SIZE * VBOXNETFLT_PACKET_INFO_POOL_SIZE;
+            break;
+
+        case OID_GEN_VENDOR_ID:
+            u32Info = VBOXNETADP_VENDOR_ID;
+            break;
+
+        case OID_GEN_VENDOR_DESCRIPTION:
+            pvInfo = VBOXNETADP_VENDOR_DESC;
+            cbInfo = sizeof (VBOXNETADP_VENDOR_DESC);
+            break;
+
+        case OID_GEN_VENDOR_DRIVER_VERSION:
+            u32Info = VBOXNETADP_VENDOR_DRIVER_VERSION;
+            break;
+
+        case OID_GEN_DRIVER_VERSION:
+            u16Info = (USHORT)((VBOXNETFLT_VERSION_MP_NDIS_MAJOR << 8) + VBOXNETFLT_VERSION_MP_NDIS_MINOR);
+            pvInfo = (PVOID)&u16Info;
+            cbInfo = sizeof (USHORT);
+            break;
+
+        case OID_GEN_MAXIMUM_SEND_PACKETS:
+            u32Info = VBOXNETFLT_PACKET_INFO_POOL_SIZE;
+            break;
+
+        case OID_GEN_MEDIA_CONNECT_STATUS:
+#ifdef VBOXNETADP_REPORT_DISCONNECTED
+            {
+                bool bNetFltActive;
+                bool bActive = vboxNetFltWinReferenceWinIfNetFltFromAdapt(pNetFlt, bNetFltActive);
+                if (bActive && bNetFltActive)
+                {
+                    u32Info = NdisMediaStateConnected;
+                }
+                else
+                {
+                    u32Info = NdisMediaStateDisconnected;
+                }
+
+                if (bActive)
+                {
+                    vboxNetFltWinDereferenceWinIf(pNetFlt);
+                }
+                if (bNetFltActive)
+                {
+                    vboxNetFltWinDereferenceNetFlt(pNetFlt);
+                }
+                else
+                {
+                    vboxNetFltWinDereferenceModePassThru(pNetFlt);
+                }
+            }
+#else
+            u32Info = NdisMediaStateConnected;
+#endif
+            break;
+
+        case OID_GEN_CURRENT_PACKET_FILTER:
+            u32Info = NDIS_PACKET_TYPE_BROADCAST
+                        | NDIS_PACKET_TYPE_DIRECTED
+                        | NDIS_PACKET_TYPE_ALL_FUNCTIONAL
+                        | NDIS_PACKET_TYPE_ALL_LOCAL
+                        | NDIS_PACKET_TYPE_GROUP
+                        | NDIS_PACKET_TYPE_MULTICAST;
+            break;
+
+        case OID_PNP_CAPABILITIES:
+            if (!bPnPCapsInited)
+            {
+                PnPCaps.WakeUpCapabilities.MinMagicPacketWakeUp = NdisDeviceStateUnspecified;
+                PnPCaps.WakeUpCapabilities.MinPatternWakeUp = NdisDeviceStateUnspecified;
+                bPnPCapsInited = TRUE;
+            }
+            cbInfo = sizeof (NDIS_PNP_CAPABILITIES);
+            pvInfo = &PnPCaps;
+
+            break;
+
+        case OID_PNP_QUERY_POWER:
+            Status = NDIS_STATUS_SUCCESS;
+            break;
+
+        case OID_GEN_XMIT_OK:
+            u64Info = pNetFlt->u.s.WinIf.cTxSuccess;
+            pvInfo = &u64Info;
+            if (InformationBufferLength >= sizeof (ULONG64) || InformationBufferLength == 0)
+            {
+                cbInfo = sizeof (ULONG64);
+            }
+            else
+            {
+                cbInfo = sizeof (ULONG);
+            }
+            *BytesNeeded = sizeof (ULONG64);
+            break;
+
+        case OID_GEN_RCV_OK:
+            u64Info = pNetFlt->u.s.WinIf.cRxSuccess;
+            pvInfo = &u64Info;
+            if (InformationBufferLength >= sizeof (ULONG64) || InformationBufferLength == 0)
+            {
+                cbInfo = sizeof (ULONG64);
+            }
+            else
+            {
+                cbInfo = sizeof (ULONG);
+            }
+            *BytesNeeded = sizeof (ULONG64);
+            break;
+
+        case OID_GEN_XMIT_ERROR:
+            u32Info = pNetFlt->u.s.WinIf.cTxError;
+            break;
+
+        case OID_GEN_RCV_ERROR:
+            u32Info = pNetFlt->u.s.WinIf.cRxError;
+            break;
+
+        case OID_GEN_RCV_NO_BUFFER:
+        case OID_GEN_RCV_CRC_ERROR:
+            u32Info = 0;
+            break;
+
+        case OID_GEN_TRANSMIT_QUEUE_LENGTH:
+            u32Info = VBOXNETFLT_PACKET_INFO_POOL_SIZE;
+            break;
+
+        case OID_802_3_PERMANENT_ADDRESS:
+            pvInfo = &pNetFlt->u.s.MacAddr;
+            cbInfo = VBOXNETADP_ETH_ADDRESS_LENGTH;
+            break;
+
+        case OID_802_3_CURRENT_ADDRESS:
+            pvInfo = &pNetFlt->u.s.MacAddr;
+            cbInfo = VBOXNETADP_ETH_ADDRESS_LENGTH;
+            break;
+
+        case OID_802_3_MAXIMUM_LIST_SIZE:
+            u32Info = VBOXNETADP_MAX_MCAST_LIST;
+            break;
+
+        case OID_802_3_MAC_OPTIONS:
+        case OID_802_3_RCV_ERROR_ALIGNMENT:
+        case OID_802_3_XMIT_ONE_COLLISION:
+        case OID_802_3_XMIT_MORE_COLLISIONS:
+        case OID_802_3_XMIT_DEFERRED:
+        case OID_802_3_XMIT_MAX_COLLISIONS:
+        case OID_802_3_RCV_OVERRUN:
+        case OID_802_3_XMIT_UNDERRUN:
+        case OID_802_3_XMIT_HEARTBEAT_FAILURE:
+        case OID_802_3_XMIT_TIMES_CRS_LOST:
+        case OID_802_3_XMIT_LATE_COLLISIONS:
+            u32Info = 0;
+            break;
+
+        default:
+            Status = NDIS_STATUS_NOT_SUPPORTED;
+            break;
+    }
+
+    if (Status == NDIS_STATUS_SUCCESS)
+    {
+        if (cbInfo <= InformationBufferLength)
+        {
+            *BytesWritten = cbInfo;
+            if (cbInfo)
+                NdisMoveMemory(InformationBuffer, pvInfo, cbInfo);
+        }
+        else
+        {
+            *BytesNeeded = cbInfo;
+            Status = NDIS_STATUS_INVALID_LENGTH;
+        }
+    }
+
+
+    LogFlowFunc(("LEAVE: pNetFlt (0x%p), Oid (%s), Status (0x%x)\n", pNetFlt, vboxNetFltWinMpDumpOid(Oid), Status));
+
+    return Status;
+}
+
+static NDIS_STATUS vboxNetFltWinMpSetInformation(IN NDIS_HANDLE MiniportAdapterContext,
+        IN NDIS_OID Oid,
+        IN PVOID InformationBuffer,
+        IN ULONG InformationBufferLength,
+        OUT PULONG BytesRead,
+        OUT PULONG BytesNeeded)
+{
+    PVBOXNETFLTINS pNetFlt = (PVBOXNETFLTINS) MiniportAdapterContext;
+    NDIS_STATUS Status = NDIS_STATUS_SUCCESS;
+
+    LogFlowFunc(("ENTER: pNetFlt (0x%p), Oid (%s)\n", pNetFlt, vboxNetFltWinMpDumpOid(Oid)));
+
+    *BytesRead = 0;
+    *BytesNeeded = 0;
+
+    switch (Oid)
+    {
+        case OID_802_3_MULTICAST_LIST:
+            *BytesRead = InformationBufferLength;
+            if (InformationBufferLength % VBOXNETADP_ETH_ADDRESS_LENGTH)
+            {
+                Status = NDIS_STATUS_INVALID_LENGTH;
+                break;
+            }
+
+            if (InformationBufferLength > (VBOXNETADP_MAX_MCAST_LIST * VBOXNETADP_ETH_ADDRESS_LENGTH))
+            {
+                Status = NDIS_STATUS_MULTICAST_FULL;
+                *BytesNeeded = VBOXNETADP_MAX_MCAST_LIST * VBOXNETADP_ETH_ADDRESS_LENGTH;
+                break;
+            }
+            break;
+
+        case OID_GEN_CURRENT_PACKET_FILTER:
+            if (InformationBufferLength != sizeof (ULONG))
+            {
+                *BytesNeeded = sizeof (ULONG);
+                Status = NDIS_STATUS_INVALID_LENGTH;
+                break;
+            }
+
+            *BytesRead = InformationBufferLength;
+
+            break;
+
+        case OID_GEN_CURRENT_LOOKAHEAD:
+            if (InformationBufferLength != sizeof (ULONG)){
+                *BytesNeeded = sizeof(ULONG);
+                Status = NDIS_STATUS_INVALID_LENGTH;
+                break;
+            }
+
+            break;
+
+        case OID_PNP_SET_POWER:
+            if (InformationBufferLength >= sizeof(NDIS_DEVICE_POWER_STATE))
+            {
+                NDIS_DEVICE_POWER_STATE *penmState = (NDIS_DEVICE_POWER_STATE*)InformationBuffer;
+                Status = vboxNetFltWinMpHandlePowerState(pNetFlt, *penmState);
+            }
+            else
+            {
+                Status = NDIS_STATUS_INVALID_LENGTH;
+            }
+
+            if (Status == NDIS_STATUS_SUCCESS)
+            {
+                *BytesRead = sizeof (NDIS_DEVICE_POWER_STATE);
+                *BytesNeeded = 0;
+            }
+            else
+            {
+                *BytesRead = 0;
+                *BytesNeeded = sizeof (NDIS_DEVICE_POWER_STATE);
+            }
+            break;
+
+        default:
+            Status = NDIS_STATUS_INVALID_OID;
+            break;
+    }
+
+    LogFlowFunc(("LEAVE: pNetFlt (0x%p), Oid (%s), Status (0x%x)\n", pNetFlt, vboxNetFltWinMpDumpOid(Oid), Status));
+
+    return Status;
+}
+
+#endif
+
+#define VBOXNETFLTDUMP_STRCASE(_t) \
+        case _t: return #_t;
+#define VBOXNETFLTDUMP_STRCASE_UNKNOWN() \
+        default: /*AssertFailed();*/ return "Unknown";
+
+static const char* vboxNetFltWinMpDumpOid(ULONG oid)
+{
+    switch (oid)
+    {
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_SUPPORTED_LIST)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_HARDWARE_STATUS)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_MEDIA_SUPPORTED)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_MEDIA_IN_USE)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_MAXIMUM_LOOKAHEAD)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_MAXIMUM_FRAME_SIZE)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_LINK_SPEED)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_TRANSMIT_BUFFER_SPACE)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_RECEIVE_BUFFER_SPACE)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_TRANSMIT_BLOCK_SIZE)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_RECEIVE_BLOCK_SIZE)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_VENDOR_ID)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_VENDOR_DESCRIPTION)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_CURRENT_PACKET_FILTER)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_CURRENT_LOOKAHEAD)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_DRIVER_VERSION)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_MAXIMUM_TOTAL_SIZE)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_PROTOCOL_OPTIONS)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_MAC_OPTIONS)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_MEDIA_CONNECT_STATUS)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_MAXIMUM_SEND_PACKETS)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_VENDOR_DRIVER_VERSION)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_SUPPORTED_GUIDS)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_NETWORK_LAYER_ADDRESSES)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_TRANSPORT_HEADER_OFFSET)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_MACHINE_NAME)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_RNDIS_CONFIG_PARAMETER)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_VLAN_ID)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_MEDIA_CAPABILITIES)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_PHYSICAL_MEDIUM)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_XMIT_OK)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_RCV_OK)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_XMIT_ERROR)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_RCV_ERROR)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_RCV_NO_BUFFER)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_DIRECTED_BYTES_XMIT)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_DIRECTED_FRAMES_XMIT)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_MULTICAST_BYTES_XMIT)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_MULTICAST_FRAMES_XMIT)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_BROADCAST_BYTES_XMIT)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_BROADCAST_FRAMES_XMIT)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_DIRECTED_BYTES_RCV)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_DIRECTED_FRAMES_RCV)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_MULTICAST_BYTES_RCV)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_MULTICAST_FRAMES_RCV)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_BROADCAST_BYTES_RCV)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_BROADCAST_FRAMES_RCV)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_RCV_CRC_ERROR)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_TRANSMIT_QUEUE_LENGTH)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_GET_TIME_CAPS)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_GET_NETCARD_TIME)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_NETCARD_LOAD)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_DEVICE_PROFILE)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_INIT_TIME_MS)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_RESET_COUNTS)
+        VBOXNETFLTDUMP_STRCASE(OID_GEN_MEDIA_SENSE_COUNTS)
+        VBOXNETFLTDUMP_STRCASE(OID_PNP_CAPABILITIES)
+        VBOXNETFLTDUMP_STRCASE(OID_PNP_SET_POWER)
+        VBOXNETFLTDUMP_STRCASE(OID_PNP_QUERY_POWER)
+        VBOXNETFLTDUMP_STRCASE(OID_PNP_ADD_WAKE_UP_PATTERN)
+        VBOXNETFLTDUMP_STRCASE(OID_PNP_REMOVE_WAKE_UP_PATTERN)
+        VBOXNETFLTDUMP_STRCASE(OID_PNP_ENABLE_WAKE_UP)
+        VBOXNETFLTDUMP_STRCASE(OID_802_3_PERMANENT_ADDRESS)
+        VBOXNETFLTDUMP_STRCASE(OID_802_3_CURRENT_ADDRESS)
+        VBOXNETFLTDUMP_STRCASE(OID_802_3_MULTICAST_LIST)
+        VBOXNETFLTDUMP_STRCASE(OID_802_3_MAXIMUM_LIST_SIZE)
+        VBOXNETFLTDUMP_STRCASE(OID_802_3_MAC_OPTIONS)
+        VBOXNETFLTDUMP_STRCASE(OID_802_3_RCV_ERROR_ALIGNMENT)
+        VBOXNETFLTDUMP_STRCASE(OID_802_3_XMIT_ONE_COLLISION)
+        VBOXNETFLTDUMP_STRCASE(OID_802_3_XMIT_MORE_COLLISIONS)
+        VBOXNETFLTDUMP_STRCASE(OID_802_3_XMIT_DEFERRED)
+        VBOXNETFLTDUMP_STRCASE(OID_802_3_XMIT_MAX_COLLISIONS)
+        VBOXNETFLTDUMP_STRCASE(OID_802_3_RCV_OVERRUN)
+        VBOXNETFLTDUMP_STRCASE(OID_802_3_XMIT_UNDERRUN)
+        VBOXNETFLTDUMP_STRCASE(OID_802_3_XMIT_HEARTBEAT_FAILURE)
+        VBOXNETFLTDUMP_STRCASE(OID_802_3_XMIT_TIMES_CRS_LOST)
+        VBOXNETFLTDUMP_STRCASE(OID_802_3_XMIT_LATE_COLLISIONS)
+        VBOXNETFLTDUMP_STRCASE(OID_TCP_TASK_OFFLOAD)
+        VBOXNETFLTDUMP_STRCASE(OID_TCP_TASK_IPSEC_ADD_SA)
+        VBOXNETFLTDUMP_STRCASE(OID_TCP_TASK_IPSEC_DELETE_SA)
+        VBOXNETFLTDUMP_STRCASE(OID_TCP_SAN_SUPPORT)
+        VBOXNETFLTDUMP_STRCASE(OID_TCP_TASK_IPSEC_ADD_UDPESP_SA)
+        VBOXNETFLTDUMP_STRCASE(OID_TCP_TASK_IPSEC_DELETE_UDPESP_SA)
+        VBOXNETFLTDUMP_STRCASE_UNKNOWN()
+    }
+}
+
+DECLHIDDEN(VOID) vboxNetFltWinMpReturnPacket(IN NDIS_HANDLE hMiniportAdapterContext, IN PNDIS_PACKET pPacket)
+{
+    PVBOXNETFLTINS pNetFlt = (PVBOXNETFLTINS)hMiniportAdapterContext;
+    PVBOXNETFLT_PKTRSVD_MP pInfo = (PVBOXNETFLT_PKTRSVD_MP)pPacket->MiniportReserved;
+    PNDIS_PACKET pOrigPacket = pInfo->pOrigPacket;
+    PVOID pBufToFree = pInfo->pBufToFree;
+
+    LogFlowFunc(("ENTER: pNetFlt (0x%p)\n", pNetFlt));
+
+    if (pOrigPacket)
+    {
+        /* the packet was sent from underlying miniport */
+        NdisFreePacket(pPacket);
+        NdisReturnPackets(&pOrigPacket, 1);
+    }
+    else
+    {
+        /* the packet was sent from IntNet or it is a packet we allocated on PtReceive for TransferData processing */
+        vboxNetFltWinFreeSGNdisPacket(pPacket, !pBufToFree /* bFreeMem */);
+    }
+
+    if (pBufToFree)
+    {
+        vboxNetFltWinMemFree(pBufToFree);
+    }
+
+    vboxNetFltWinDereferenceWinIf(pNetFlt);
+
+    LogFlowFunc(("LEAVE: pNetFlt (0x%p)\n", pNetFlt));
+}
+
+static NDIS_STATUS vboxNetFltWinMpTransferData(OUT PNDIS_PACKET Packet,
+        OUT PUINT BytesTransferred,
+        IN NDIS_HANDLE hContext,
+        IN NDIS_HANDLE MiniportReceiveContext,
+        IN UINT ByteOffset,
+        IN UINT BytesToTransfer)
+{
+#ifndef VBOXNETADP
+    PVBOXNETFLTINS pNetFlt = (PVBOXNETFLTINS)hContext;
+    NDIS_STATUS Status;
+
+    LogFlowFunc(("ENTER: pNetFlt (0x%p)\n", pNetFlt));
+
+    if (   vboxNetFltWinGetPowerState(&pNetFlt->u.s.WinIf.PtState) != NdisDeviceStateD0
+        || vboxNetFltWinGetPowerState(&pNetFlt->u.s.WinIf.MpState) != NdisDeviceStateD0)
+    {
+        LogFlowFunc(("LEAVE: pNetFlt (0x%p), Status (0x%x)\n", pNetFlt, NDIS_STATUS_FAILURE));
+        return NDIS_STATUS_FAILURE;
+    }
+
+    NdisTransferData(&Status, pNetFlt->u.s.WinIf.hBinding, MiniportReceiveContext,
+                     ByteOffset, BytesToTransfer, Packet, BytesTransferred);
+
+    LogFlowFunc(("LEAVE: pNetFlt (0x%p), Status (0x%x)\n", pNetFlt, Status));
+    return Status;
+
+#else
+    RT_NOREF6(Packet, BytesTransferred, hContext, MiniportReceiveContext, ByteOffset, BytesToTransfer);
+    LogFlowFunc(("ENTER: pNetFlt (0x%p)\n", hContext));
+    /* should never be here */
+    AssertFailed();
+    LogFlowFunc(("LEAVE: pNetFlt (0x%p), Status (0x%x)\n", hContext, NDIS_STATUS_FAILURE));
+    return NDIS_STATUS_FAILURE;
+#endif
+}
+
+static void vboxNetFltWinMpHalt(IN NDIS_HANDLE hContext)
+{
+    PVBOXNETFLTINS pNetFlt = (PVBOXNETFLTINS)hContext;
+    NDIS_STATUS Status;
+
+    LogFlowFunc(("ENTER: pNetFlt (0x%p)\n", pNetFlt));
+
+#ifndef VBOXNETADP
+    if (vboxNetFltWinGetWinIfState(pNetFlt) == kVBoxWinIfState_Disconnecting)
+    {
+        Assert(vboxNetFltWinGetOpState(&pNetFlt->u.s.WinIf.MpState) == kVBoxNetDevOpState_Deinitializing);
+        vboxNetFltWinSetOpState(&pNetFlt->u.s.WinIf.MpState, kVBoxNetDevOpState_Deinitializing);
+
+        vboxNetFltWinPtCloseInterface(pNetFlt, &Status);
+
+        Assert(vboxNetFltWinGetOpState(&pNetFlt->u.s.WinIf.PtState) == kVBoxNetDevOpState_Deinitializing);
+        vboxNetFltWinSetOpState(&pNetFlt->u.s.WinIf.PtState, kVBoxNetDevOpState_Deinitialized);
+        vboxNetFltWinSetOpState(&pNetFlt->u.s.WinIf.MpState, kVBoxNetDevOpState_Deinitialized);
+    }
+    else
+#endif
+    {
+        /* we're NOT called from protocolUnbinAdapter, perform a full disconnect */
+        Assert(vboxNetFltWinGetOpState(&pNetFlt->u.s.WinIf.MpState) == kVBoxNetDevOpState_Initialized);
+#ifndef VBOXNETADP
+        AssertBreakpoint();
+#endif
+        Status = vboxNetFltWinDetachFromInterface(pNetFlt, false);
+        Assert(Status == NDIS_STATUS_SUCCESS);
+    }
+
+    LogFlowFunc(("LEAVE: pNetFlt (0x%p)\n", pNetFlt));
+}
+
+/**
+ * register the miniport edge
+ */
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinMpRegister(PVBOXNETFLTGLOBALS_MP pGlobalsMp, PDRIVER_OBJECT pDriverObject, PUNICODE_STRING pRegistryPathStr)
+{
+    NDIS_MINIPORT_CHARACTERISTICS MpChars;
+
+    NdisMInitializeWrapper(&pGlobalsMp->hNdisWrapper, pDriverObject, pRegistryPathStr, NULL);
+
+    NdisZeroMemory(&MpChars, sizeof (MpChars));
+
+    MpChars.MajorNdisVersion = VBOXNETFLT_VERSION_MP_NDIS_MAJOR;
+    MpChars.MinorNdisVersion = VBOXNETFLT_VERSION_MP_NDIS_MINOR;
+
+    MpChars.HaltHandler = vboxNetFltWinMpHalt;
+    MpChars.InitializeHandler = vboxNetFltWinMpInitialize;
+    MpChars.QueryInformationHandler = vboxNetFltWinMpQueryInformation;
+    MpChars.SetInformationHandler = vboxNetFltWinMpSetInformation;
+    MpChars.TransferDataHandler = vboxNetFltWinMpTransferData;
+    MpChars.ReturnPacketHandler = vboxNetFltWinMpReturnPacket;
+    MpChars.SendPacketsHandler = vboxNetFltWinMpSendPackets;
+
+#ifndef VBOXNETADP
+    NDIS_STATUS Status = NdisIMRegisterLayeredMiniport(pGlobalsMp->hNdisWrapper, &MpChars, sizeof (MpChars), &pGlobalsMp->hMiniport);
+#else
+    NDIS_STATUS Status = NdisMRegisterMiniport(pGlobalsMp->hNdisWrapper, &MpChars, sizeof (MpChars));
+#endif
+    Assert(Status == NDIS_STATUS_SUCCESS);
+    if (Status == NDIS_STATUS_SUCCESS)
+    {
+        NdisMRegisterUnloadHandler(pGlobalsMp->hNdisWrapper, vboxNetFltWinUnload);
+    }
+
+    return Status;
+}
+
+/**
+ * deregister the miniport edge
+ */
+DECLHIDDEN(VOID) vboxNetFltWinMpDeregister(PVBOXNETFLTGLOBALS_MP pGlobalsMp)
+{
+#ifndef VBOXNETADP
+    NdisIMDeregisterLayeredMiniport(pGlobalsMp->hMiniport);
+#endif
+    NdisTerminateWrapper(pGlobalsMp->hNdisWrapper, NULL);
+
+    NdisZeroMemory(pGlobalsMp, sizeof (*pGlobalsMp));
+}
+
+#ifndef VBOXNETADP
+
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinMpInitializeDevideInstance(PVBOXNETFLTINS pThis)
+{
+    NDIS_STATUS Status;
+    Assert(vboxNetFltWinGetOpState(&pThis->u.s.WinIf.MpState) == kVBoxNetDevOpState_Deinitialized);
+    vboxNetFltWinSetOpState(&pThis->u.s.WinIf.MpState, kVBoxNetDevOpState_Initializing);
+
+    Status = NdisIMInitializeDeviceInstanceEx(g_VBoxNetFltGlobalsWin.Mp.hMiniport,
+                                       &pThis->u.s.WinIf.MpDeviceName,
+                                       pThis);
+    if (Status == NDIS_STATUS_SUCCESS)
+    {
+        if (pThis->u.s.WinIf.OpenCloseStatus == NDIS_STATUS_SUCCESS)
+        {
+            return NDIS_STATUS_SUCCESS;
+        }
+        AssertBreakpoint();
+        vboxNetFltWinMpDeInitializeDeviceInstance(pThis, &Status);
+        Assert(vboxNetFltWinGetOpState(&pThis->u.s.WinIf.MpState) == kVBoxNetDevOpState_Deinitialized);
+        vboxNetFltWinSetOpState(&pThis->u.s.WinIf.MpState, kVBoxNetDevOpState_Deinitialized);
+        return pThis->u.s.WinIf.OpenCloseStatus;
+    }
+
+    Assert(vboxNetFltWinGetOpState(&pThis->u.s.WinIf.MpState) == kVBoxNetDevOpState_Deinitialized);
+    vboxNetFltWinSetOpState(&pThis->u.s.WinIf.MpState, kVBoxNetDevOpState_Deinitialized);
+
+    return Status;
+}
+
+DECLHIDDEN(bool) vboxNetFltWinMpDeInitializeDeviceInstance(PVBOXNETFLTINS pThis, PNDIS_STATUS pStatus)
+{
+    NDIS_STATUS Status;
+
+    if (vboxNetFltWinGetOpState(&pThis->u.s.WinIf.MpState) == kVBoxNetDevOpState_Initializing)
+    {
+        Status = NdisIMCancelInitializeDeviceInstance(g_VBoxNetFltGlobalsWin.Mp.hMiniport, &pThis->u.s.WinIf.MpDeviceName);
+        if (Status == NDIS_STATUS_SUCCESS)
+        {
+            /* we've canceled the initialization successfully */
+            Assert(pThis->u.s.WinIf.hMiniport == NULL);
+            Assert(vboxNetFltWinGetOpState(&pThis->u.s.WinIf.MpState) == kVBoxNetDevOpState_Deinitialized);
+            vboxNetFltWinSetOpState(&pThis->u.s.WinIf.MpState, kVBoxNetDevOpState_Deinitialized);
+        }
+        else
+            NdisWaitEvent(&pThis->u.s.WinIf.MpInitCompleteEvent, 0);
+    }
+    else
+        Status = NDIS_STATUS_SUCCESS;
+
+    Assert(   vboxNetFltWinGetOpState(&pThis->u.s.WinIf.MpState) == kVBoxNetDevOpState_Initialized
+           || vboxNetFltWinGetOpState(&pThis->u.s.WinIf.MpState) == kVBoxNetDevOpState_Deinitialized);
+    if (vboxNetFltWinGetOpState(&pThis->u.s.WinIf.MpState) == kVBoxNetDevOpState_Initialized)
+    {
+        vboxNetFltWinSetOpState(&pThis->u.s.WinIf.MpState, kVBoxNetDevOpState_Deinitializing);
+
+        Status = NdisIMDeInitializeDeviceInstance(pThis->u.s.WinIf.hMiniport);
+
+        vboxNetFltWinSetOpState(&pThis->u.s.WinIf.MpState, kVBoxNetDevOpState_Deinitialized);
+        if (Status != NDIS_STATUS_SUCCESS)
+            Status = NDIS_STATUS_FAILURE;
+
+        *pStatus = Status;
+        return true;
+    }
+
+    Assert(vboxNetFltWinGetOpState(&pThis->u.s.WinIf.MpState) == kVBoxNetDevOpState_Deinitialized);
+    vboxNetFltWinSetOpState(&pThis->u.s.WinIf.MpState, kVBoxNetDevOpState_Deinitialized);
+
+    *pStatus = Status;
+    return false;
+}
+
+#endif /* !VBOXNETADP */
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFltM-win.h b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFltM-win.h
new file mode 100644
index 00000000..689caebf
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFltM-win.h
@@ -0,0 +1,57 @@
+/* $Id: VBoxNetFltM-win.h $ */
+/** @file
+ * VBoxNetFltM-win.h - Bridged Networking Driver, Windows Specific Code - Miniport edge API
+ */
+
+/*
+ * Copyright (C) 2011-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#ifndef VBOX_INCLUDED_SRC_VBoxNetFlt_win_drv_VBoxNetFltM_win_h
+#define VBOX_INCLUDED_SRC_VBoxNetFlt_win_drv_VBoxNetFltM_win_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinMpRegister(PVBOXNETFLTGLOBALS_MP pGlobalsMp, PDRIVER_OBJECT pDriverObject, PUNICODE_STRING pRegistryPathStr);
+DECLHIDDEN(VOID) vboxNetFltWinMpDeregister(PVBOXNETFLTGLOBALS_MP pGlobalsMp);
+DECLHIDDEN(VOID) vboxNetFltWinMpReturnPacket(IN NDIS_HANDLE hMiniportAdapterContext, IN PNDIS_PACKET pPacket);
+
+#ifdef VBOXNETADP
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinMpDoInitialization(PVBOXNETFLTINS pThis, NDIS_HANDLE hMiniportAdapter, NDIS_HANDLE hWrapperConfigurationContext);
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinMpDoDeinitialization(PVBOXNETFLTINS pThis);
+
+#else
+
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinMpInitializeDevideInstance(PVBOXNETFLTINS pThis);
+DECLHIDDEN(bool) vboxNetFltWinMpDeInitializeDeviceInstance(PVBOXNETFLTINS pThis, PNDIS_STATUS pStatus);
+
+DECLINLINE(VOID) vboxNetFltWinMpRequestStateComplete(PVBOXNETFLTINS pNetFlt)
+{
+    RTSpinlockAcquire(pNetFlt->hSpinlock);
+    pNetFlt->u.s.WinIf.StateFlags.fRequestInfo = 0;
+    RTSpinlockRelease(pNetFlt->hSpinlock);
+}
+
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinMpRequestPost(PVBOXNETFLTINS pNetFlt);
+#endif
+
+#endif /* !VBOX_INCLUDED_SRC_VBoxNetFlt_win_drv_VBoxNetFltM_win_h */
+
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFltM.inf b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFltM.inf
new file mode 100644
index 00000000..1b83fdac
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFltM.inf
@@ -0,0 +1,78 @@
+; $Id: VBoxNetFltM.inf $
+;; @file
+; VBoxNetFltM.inf - VirtualBox Bridged Networking Driver inf file Miniport edge
+;
+
+;
+; Copyright (C) 2011-2020 Oracle Corporation
+;
+; This file is part of VirtualBox Open Source Edition (OSE), as
+; available from http://www.virtualbox.org. This file is free software;
+; you can redistribute it and/or modify it under the terms of the GNU
+; General Public License (GPL) as published by the Free Software
+; Foundation, in version 2 as it comes in the "COPYING" file of the
+; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+;
+; The contents of this file may alternatively be used under the terms
+; of the Common Development and Distribution License Version 1.0
+; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+; VirtualBox OSE distribution, in which case the provisions of the
+; CDDL are applicable instead of those of the GPL.
+;
+; You may elect to license modified versions of this file under the
+; terms and conditions of either the GPL or the CDDL or both.
+;
+
+[Version]
+signature  = "$Windows NT$"
+;cat   CatalogFile = VBoxNetFlt.cat
+Class      = Net
+ClassGUID  = {4d36e972-e325-11ce-bfc1-08002be10318}
+Provider   = %Provider%
+;DriverPackageType=NdisImMiniport
+;DriverPackageDisplayName=%VBoxNetFltMP_Desc%
+;edit-DriverVer=08/13/2008,1.1.0.1
+
+[ControlFlags]
+ExcludeFromSelect = sun_VBoxNetFltmp
+
+[DestinationDirs]
+DefaultDestDir=12
+; No files to copy
+
+[Manufacturer]
+%Provider% = VBox,NTx86,NTamd64
+
+[VBox]
+%VBoxNetFltMP_Desc% = VBoxNetFltMP.ndi, sun_VBoxNetFltmp
+
+[VBox.NTx86]
+%VBoxNetFltMP_Desc% = VBoxNetFltMP.ndi, sun_VBoxNetFltmp
+
+[VBox.NTamd64]
+%VBoxNetFltMP_Desc% = VBoxNetFltMP.ndi, sun_VBoxNetFltmp
+
+[VBoxNetFltMP.ndi]
+Characteristics = 0x29 ;NCF_NOT_USER_REMOVABLE | NCF_VIRTUAL | NCF_HIDDEN
+CopyFiles =
+
+[VBoxNetFltMP.ndi.Services]
+AddService = VBoxNetFlt,0x2, VBoxNetFltMP.AddService
+
+[VBoxNetFltMP.AddService]
+ServiceType    = 1 ;SERVICE_KERNEL_DRIVER
+StartType      = 3 ;SERVICE_DEMAND_START
+ErrorControl   = 1 ;SERVICE_ERROR_NORMAL
+ServiceBinary  = %12%\VBoxNetFlt.sys
+
+[VBoxNetFltMP.AddService.AddReg]
+
+[Strings]
+Provider = "Oracle Corporation"
+VBoxNetFltMP_Desc = "VirtualBox Bridged Networking Driver Miniport"
+
+[SourceDisksNames]
+
+[SourceDisksFiles]
+
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFltP-win.cpp b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFltP-win.cpp
new file mode 100644
index 00000000..76ab1a6e
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFltP-win.cpp
@@ -0,0 +1,1585 @@
+/* $Id: VBoxNetFltP-win.cpp $ */
+/** @file
+ * VBoxNetFltP-win.cpp - Bridged Networking Driver, Windows Specific Code.
+ * Protocol edge
+ */
+/*
+ * Copyright (C) 2011-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+#include "VBoxNetFltCmn-win.h"
+
+#ifdef VBOXNETADP
+# error "No protocol edge"
+#endif
+
+#define VBOXNETFLT_PT_STATUS_IS_FILTERED(_s) (\
+       (_s) == NDIS_STATUS_MEDIA_CONNECT \
+    || (_s) == NDIS_STATUS_MEDIA_DISCONNECT \
+    )
+
+/**
+ * performs binding to the given adapter
+ */
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinPtDoBinding(PVBOXNETFLTINS pThis, PNDIS_STRING pOurDeviceName, PNDIS_STRING pBindToDeviceName)
+{
+    Assert(pThis->u.s.WinIf.PtState.PowerState == NdisDeviceStateD3);
+    Assert(pThis->u.s.WinIf.PtState.OpState == kVBoxNetDevOpState_Deinitialized);
+    Assert(KeGetCurrentIrql() == PASSIVE_LEVEL);
+
+    vboxNetFltWinSetOpState(&pThis->u.s.WinIf.PtState, kVBoxNetDevOpState_Initializing);
+
+    NDIS_STATUS Status = vboxNetFltWinCopyString(&pThis->u.s.WinIf.MpDeviceName, pOurDeviceName);
+    Assert (Status == NDIS_STATUS_SUCCESS);
+    if (Status == NDIS_STATUS_SUCCESS)
+    {
+        vboxNetFltWinSetPowerState(&pThis->u.s.WinIf.PtState, NdisDeviceStateD0);
+        pThis->u.s.WinIf.OpenCloseStatus = NDIS_STATUS_SUCCESS;
+
+        UINT iMedium;
+        NDIS_STATUS TmpStatus;
+        NDIS_MEDIUM aenmNdisMedium[] =
+        {
+                /* Ethernet */
+                NdisMedium802_3,
+                /* Wan */
+                NdisMediumWan
+        };
+
+        NdisResetEvent(&pThis->u.s.WinIf.OpenCloseEvent);
+
+        NdisOpenAdapter(&Status, &TmpStatus, &pThis->u.s.WinIf.hBinding, &iMedium,
+                aenmNdisMedium, RT_ELEMENTS(aenmNdisMedium),
+                g_VBoxNetFltGlobalsWin.Pt.hProtocol,
+                pThis,
+                pBindToDeviceName,
+                0, /* IN UINT OpenOptions, (reserved, should be NULL) */
+                NULL /* IN PSTRING AddressingInformation  OPTIONAL */
+                );
+        Assert(Status == NDIS_STATUS_PENDING || Status == STATUS_SUCCESS);
+        if (Status == NDIS_STATUS_PENDING)
+        {
+            NdisWaitEvent(&pThis->u.s.WinIf.OpenCloseEvent, 0);
+            Status = pThis->u.s.WinIf.OpenCloseStatus;
+        }
+
+        Assert(Status == NDIS_STATUS_SUCCESS);
+        if (Status == NDIS_STATUS_SUCCESS)
+        {
+            Assert(pThis->u.s.WinIf.hBinding);
+            pThis->u.s.WinIf.enmMedium = aenmNdisMedium[iMedium];
+            vboxNetFltWinSetOpState(&pThis->u.s.WinIf.PtState, kVBoxNetDevOpState_Initialized);
+
+            Status = vboxNetFltWinMpInitializeDevideInstance(pThis);
+            Assert(Status == NDIS_STATUS_SUCCESS);
+            if (Status == NDIS_STATUS_SUCCESS)
+            {
+                return NDIS_STATUS_SUCCESS;
+            }
+            else
+            {
+                LogRelFunc(("vboxNetFltWinMpInitializeDevideInstance failed, Status 0x%x\n", Status));
+            }
+
+            vboxNetFltWinSetOpState(&pThis->u.s.WinIf.PtState, kVBoxNetDevOpState_Deinitializing);
+            vboxNetFltWinPtCloseInterface(pThis, &TmpStatus);
+            Assert(TmpStatus == NDIS_STATUS_SUCCESS);
+            vboxNetFltWinSetOpState(&pThis->u.s.WinIf.PtState, kVBoxNetDevOpState_Deinitialized);
+        }
+        else
+        {
+            LogRelFunc(("NdisOpenAdapter failed, Status (0x%x)", Status));
+        }
+
+        vboxNetFltWinSetOpState(&pThis->u.s.WinIf.PtState, kVBoxNetDevOpState_Deinitialized);
+        pThis->u.s.WinIf.hBinding = NULL;
+    }
+
+    return Status;
+}
+
+static VOID vboxNetFltWinPtBindAdapter(OUT PNDIS_STATUS pStatus,
+        IN NDIS_HANDLE hBindContext,
+        IN PNDIS_STRING pDeviceNameStr,
+        IN PVOID pvSystemSpecific1,
+        IN PVOID pvSystemSpecific2)
+{
+    LogFlowFuncEnter();
+    RT_NOREF2(hBindContext, pvSystemSpecific2);
+
+    NDIS_STATUS Status;
+    NDIS_HANDLE hConfig = NULL;
+
+    NdisOpenProtocolConfiguration(&Status, &hConfig, (PNDIS_STRING)pvSystemSpecific1);
+    Assert(Status == NDIS_STATUS_SUCCESS);
+    if (Status == NDIS_STATUS_SUCCESS)
+    {
+        PNDIS_CONFIGURATION_PARAMETER pParam;
+        NDIS_STRING UppedBindStr = NDIS_STRING_CONST("UpperBindings");
+        NdisReadConfiguration(&Status, &pParam, hConfig, &UppedBindStr, NdisParameterString);
+        Assert(Status == NDIS_STATUS_SUCCESS);
+        if (Status == NDIS_STATUS_SUCCESS)
+        {
+            PVBOXNETFLTINS pNetFlt;
+            Status = vboxNetFltWinPtInitBind(&pNetFlt, &pParam->ParameterData.StringData, pDeviceNameStr);
+            Assert(Status == NDIS_STATUS_SUCCESS);
+        }
+
+        NdisCloseConfiguration(hConfig);
+    }
+
+    *pStatus = Status;
+
+    LogFlowFunc(("LEAVE: Status 0x%x\n", Status));
+}
+
+static VOID vboxNetFltWinPtOpenAdapterComplete(IN NDIS_HANDLE hProtocolBindingContext, IN NDIS_STATUS Status, IN NDIS_STATUS OpenErrorStatus)
+{
+    PVBOXNETFLTINS pNetFlt = (PVBOXNETFLTINS)hProtocolBindingContext;
+    RT_NOREF1(OpenErrorStatus);
+
+    LogFlowFunc(("ENTER: pNetFlt (0x%p), Status (0x%x), OpenErrorStatus(0x%x)\n", pNetFlt, Status, OpenErrorStatus));
+    Assert(pNetFlt->u.s.WinIf.OpenCloseStatus == NDIS_STATUS_SUCCESS);
+    Assert(Status == NDIS_STATUS_SUCCESS);
+    if (pNetFlt->u.s.WinIf.OpenCloseStatus == NDIS_STATUS_SUCCESS)
+    {
+        pNetFlt->u.s.WinIf.OpenCloseStatus = Status;
+        Assert(Status == NDIS_STATUS_SUCCESS);
+        if (Status != NDIS_STATUS_SUCCESS)
+            LogRelFunc(("Open Complete status is 0x%x", Status));
+    }
+    else
+        LogRelFunc(("Adapter maintained status is 0x%x", pNetFlt->u.s.WinIf.OpenCloseStatus));
+    NdisSetEvent(&pNetFlt->u.s.WinIf.OpenCloseEvent);
+    LogFlowFunc(("LEAVE: pNetFlt (0x%p), Status (0x%x), OpenErrorStatus(0x%x)\n", pNetFlt, Status, OpenErrorStatus));
+}
+
+static void vboxNetFltWinPtRequestsWaitComplete(PVBOXNETFLTINS pNetFlt)
+{
+    /* wait for request to complete */
+    while (vboxNetFltWinAtomicUoReadWinState(pNetFlt->u.s.WinIf.StateFlags).fRequestInfo == VBOXNDISREQUEST_INPROGRESS)
+    {
+        vboxNetFltWinSleep(2);
+    }
+
+    /*
+     * If the below miniport is going to low power state, complete the queued request
+     */
+    RTSpinlockAcquire(pNetFlt->hSpinlock);
+    if (pNetFlt->u.s.WinIf.StateFlags.fRequestInfo & VBOXNDISREQUEST_QUEUED)
+    {
+        /* mark the request as InProgress before posting it to RequestComplete */
+        pNetFlt->u.s.WinIf.StateFlags.fRequestInfo = VBOXNDISREQUEST_INPROGRESS;
+        RTSpinlockRelease(pNetFlt->hSpinlock);
+        vboxNetFltWinPtRequestComplete(pNetFlt, &pNetFlt->u.s.WinIf.PassDownRequest, NDIS_STATUS_FAILURE);
+    }
+    else
+    {
+        RTSpinlockRelease(pNetFlt->hSpinlock);
+    }
+}
+
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinPtDoUnbinding(PVBOXNETFLTINS pNetFlt, bool bOnUnbind)
+{
+    NDIS_STATUS Status;
+    uint64_t NanoTS = RTTimeSystemNanoTS();
+    int cPPUsage;
+
+    LogFlowFunc(("ENTER: pNetFlt 0x%p\n", pNetFlt));
+
+    Assert(KeGetCurrentIrql() == PASSIVE_LEVEL);
+
+    Assert(vboxNetFltWinGetOpState(&pNetFlt->u.s.WinIf.PtState) == kVBoxNetDevOpState_Initialized);
+
+    RTSpinlockAcquire(pNetFlt->hSpinlock);
+
+    ASMAtomicUoWriteBool(&pNetFlt->fDisconnectedFromHost, true);
+    ASMAtomicUoWriteBool(&pNetFlt->fRediscoveryPending, false);
+    ASMAtomicUoWriteU64(&pNetFlt->NanoTSLastRediscovery, NanoTS);
+
+    vboxNetFltWinSetOpState(&pNetFlt->u.s.WinIf.PtState, kVBoxNetDevOpState_Deinitializing);
+    if (!bOnUnbind)
+    {
+        vboxNetFltWinSetOpState(&pNetFlt->u.s.WinIf.MpState, kVBoxNetDevOpState_Deinitializing);
+    }
+
+    RTSpinlockRelease(pNetFlt->hSpinlock);
+
+    vboxNetFltWinPtRequestsWaitComplete(pNetFlt);
+
+    vboxNetFltWinWaitDereference(&pNetFlt->u.s.WinIf.MpState);
+    vboxNetFltWinWaitDereference(&pNetFlt->u.s.WinIf.PtState);
+
+    /* check packet pool is empty */
+    cPPUsage = NdisPacketPoolUsage(pNetFlt->u.s.WinIf.hSendPacketPool);
+    Assert(cPPUsage == 0);
+    cPPUsage = NdisPacketPoolUsage(pNetFlt->u.s.WinIf.hRecvPacketPool);
+    Assert(cPPUsage == 0);
+    /* for debugging only, ignore the err in release */
+    NOREF(cPPUsage);
+
+    if (!bOnUnbind || !vboxNetFltWinMpDeInitializeDeviceInstance(pNetFlt, &Status))
+    {
+        vboxNetFltWinPtCloseInterface(pNetFlt, &Status);
+        vboxNetFltWinSetOpState(&pNetFlt->u.s.WinIf.PtState, kVBoxNetDevOpState_Deinitialized);
+
+        if (!bOnUnbind)
+        {
+            Assert(vboxNetFltWinGetOpState(&pNetFlt->u.s.WinIf.MpState) == kVBoxNetDevOpState_Deinitializing);
+            vboxNetFltWinSetOpState(&pNetFlt->u.s.WinIf.MpState, kVBoxNetDevOpState_Deinitialized);
+        }
+        else
+        {
+            Assert(vboxNetFltWinGetOpState(&pNetFlt->u.s.WinIf.MpState) == kVBoxNetDevOpState_Deinitialized);
+        }
+    }
+    else
+    {
+        Assert(vboxNetFltWinGetOpState(&pNetFlt->u.s.WinIf.MpState) == kVBoxNetDevOpState_Deinitialized);
+    }
+
+    LogFlowFunc(("LEAVE: pNetFlt 0x%p\n", pNetFlt));
+
+    return Status;
+}
+
+static VOID vboxNetFltWinPtUnbindAdapter(OUT PNDIS_STATUS pStatus,
+        IN NDIS_HANDLE hContext,
+        IN NDIS_HANDLE hUnbindContext)
+{
+    PVBOXNETFLTINS pNetFlt = (PVBOXNETFLTINS)hContext;
+    RT_NOREF1(hUnbindContext);
+
+    LogFlowFunc(("ENTER: pNetFlt (0x%p)\n", pNetFlt));
+
+    *pStatus = vboxNetFltWinDetachFromInterface(pNetFlt, true);
+    Assert(*pStatus == NDIS_STATUS_SUCCESS);
+
+    LogFlowFunc(("LEAVE: pNetFlt (0x%p)\n", pNetFlt));
+}
+
+static VOID vboxNetFltWinPtUnloadProtocol()
+{
+    LogFlowFuncEnter();
+    NDIS_STATUS Status = vboxNetFltWinPtDeregister(&g_VBoxNetFltGlobalsWin.Pt);
+    Assert(Status == NDIS_STATUS_SUCCESS); NOREF(Status);
+    LogFlowFunc(("LEAVE: PtDeregister Status (0x%x)\n", Status));
+}
+
+
+static VOID vboxNetFltWinPtCloseAdapterComplete(IN NDIS_HANDLE ProtocolBindingContext, IN NDIS_STATUS Status)
+{
+    PVBOXNETFLTINS pNetFlt = (PVBOXNETFLTINS)ProtocolBindingContext;
+
+    LogFlowFunc(("ENTER: pNetFlt (0x%p), Status (0x%x)\n", pNetFlt, Status));
+    Assert(pNetFlt->u.s.WinIf.OpenCloseStatus == NDIS_STATUS_SUCCESS);
+    Assert(Status == NDIS_STATUS_SUCCESS);
+    Assert(pNetFlt->u.s.WinIf.OpenCloseStatus == NDIS_STATUS_SUCCESS);
+    if (pNetFlt->u.s.WinIf.OpenCloseStatus == NDIS_STATUS_SUCCESS)
+    {
+        pNetFlt->u.s.WinIf.OpenCloseStatus = Status;
+    }
+    NdisSetEvent(&pNetFlt->u.s.WinIf.OpenCloseEvent);
+    LogFlowFunc(("LEAVE: pNetFlt (0x%p), Status (0x%x)\n", pNetFlt, Status));
+}
+
+static VOID vboxNetFltWinPtResetComplete(IN NDIS_HANDLE hProtocolBindingContext, IN NDIS_STATUS Status)
+{
+    RT_NOREF2(hProtocolBindingContext, Status);
+    LogFlowFunc(("ENTER: pNetFlt 0x%p, Status 0x%x\n", hProtocolBindingContext, Status));
+    /*
+     * should never be here
+     */
+    AssertFailed();
+    LogFlowFunc(("LEAVE: pNetFlt 0x%p, Status 0x%x\n", hProtocolBindingContext, Status));
+}
+
+static NDIS_STATUS vboxNetFltWinPtHandleQueryInfoComplete(PVBOXNETFLTINS pNetFlt, NDIS_STATUS Status)
+{
+    PNDIS_REQUEST pRequest = &pNetFlt->u.s.WinIf.PassDownRequest;
+
+    switch (pRequest->DATA.QUERY_INFORMATION.Oid)
+    {
+        case OID_PNP_CAPABILITIES:
+        {
+            if (Status == NDIS_STATUS_SUCCESS)
+            {
+                if (pRequest->DATA.QUERY_INFORMATION.InformationBufferLength >= sizeof (NDIS_PNP_CAPABILITIES))
+                {
+                    PNDIS_PNP_CAPABILITIES pPnPCaps = (PNDIS_PNP_CAPABILITIES)(pRequest->DATA.QUERY_INFORMATION.InformationBuffer);
+                    PNDIS_PM_WAKE_UP_CAPABILITIES pPmWuCaps = &pPnPCaps->WakeUpCapabilities;
+                    pPmWuCaps->MinMagicPacketWakeUp = NdisDeviceStateUnspecified;
+                    pPmWuCaps->MinPatternWakeUp = NdisDeviceStateUnspecified;
+                    pPmWuCaps->MinLinkChangeWakeUp = NdisDeviceStateUnspecified;
+                    *pNetFlt->u.s.WinIf.pcPDRBytesRW = sizeof (NDIS_PNP_CAPABILITIES);
+                    *pNetFlt->u.s.WinIf.pcPDRBytesNeeded = 0;
+                    Status = NDIS_STATUS_SUCCESS;
+                }
+                else
+                {
+                    AssertFailed();
+                    *pNetFlt->u.s.WinIf.pcPDRBytesNeeded = sizeof(NDIS_PNP_CAPABILITIES);
+                    Status = NDIS_STATUS_RESOURCES;
+                }
+            }
+            break;
+        }
+
+        case OID_GEN_MAC_OPTIONS:
+        {
+            if (Status == NDIS_STATUS_SUCCESS)
+            {
+                if (pRequest->DATA.QUERY_INFORMATION.InformationBufferLength >= sizeof (ULONG))
+                {
+                    pNetFlt->u.s.WinIf.fMacOptions = *(PULONG)pRequest->DATA.QUERY_INFORMATION.InformationBuffer;
+#ifndef VBOX_LOOPBACK_USEFLAGS
+                    /* clearing this flag tells ndis we'll handle loopback ourselves
+                     * the ndis layer or nic driver below us would loopback packets as necessary */
+                    *(PULONG)pRequest->DATA.QUERY_INFORMATION.InformationBuffer &= ~NDIS_MAC_OPTION_NO_LOOPBACK;
+#else
+                    /* we have to catch loopbacks from the underlying driver, so no duplications will occur,
+                     * just indicate NDIS to handle loopbacks for the packets coming from the protocol */
+                    *(PULONG)pRequest->DATA.QUERY_INFORMATION.InformationBuffer |= NDIS_MAC_OPTION_NO_LOOPBACK;
+#endif
+                }
+                else
+                {
+                    AssertFailed();
+                    *pNetFlt->u.s.WinIf.pcPDRBytesNeeded = sizeof (ULONG);
+                    Status = NDIS_STATUS_RESOURCES;
+                }
+            }
+            break;
+        }
+
+        case OID_GEN_CURRENT_PACKET_FILTER:
+        {
+            if (VBOXNETFLT_PROMISCUOUS_SUPPORTED(pNetFlt))
+            {
+                /* we're here _ONLY_ in the passthru mode */
+                Assert(pNetFlt->u.s.WinIf.StateFlags.fProcessingPacketFilter && !pNetFlt->u.s.WinIf.StateFlags.fPPFNetFlt);
+                if (pNetFlt->u.s.WinIf.StateFlags.fProcessingPacketFilter && !pNetFlt->u.s.WinIf.StateFlags.fPPFNetFlt)
+                {
+                    Assert(pNetFlt->enmTrunkState != INTNETTRUNKIFSTATE_ACTIVE);
+                    vboxNetFltWinDereferenceModePassThru(pNetFlt);
+                    vboxNetFltWinDereferenceWinIf(pNetFlt);
+                }
+
+                if (Status == NDIS_STATUS_SUCCESS)
+                {
+                    if (pRequest->DATA.QUERY_INFORMATION.InformationBufferLength >= sizeof (ULONG))
+                    {
+                        /* the filter request is issued below only in case netflt is not active,
+                         * simply update the cache here */
+                        /* cache the filter used by upper protocols */
+                        pNetFlt->u.s.WinIf.fUpperProtocolSetFilter = *(PULONG)pRequest->DATA.QUERY_INFORMATION.InformationBuffer;
+                        pNetFlt->u.s.WinIf.StateFlags.fUpperProtSetFilterInitialized = TRUE;
+                    }
+                    else
+                    {
+                        AssertFailed();
+                        *pNetFlt->u.s.WinIf.pcPDRBytesNeeded = sizeof (ULONG);
+                        Status = NDIS_STATUS_RESOURCES;
+                    }
+                }
+            }
+            break;
+        }
+
+        default:
+            Assert(pRequest->DATA.QUERY_INFORMATION.Oid != OID_PNP_QUERY_POWER);
+            break;
+    }
+
+    *pNetFlt->u.s.WinIf.pcPDRBytesRW = pRequest->DATA.QUERY_INFORMATION.BytesWritten;
+    *pNetFlt->u.s.WinIf.pcPDRBytesNeeded = pRequest->DATA.QUERY_INFORMATION.BytesNeeded;
+
+    return Status;
+}
+
+static NDIS_STATUS vboxNetFltWinPtHandleSetInfoComplete(PVBOXNETFLTINS pNetFlt, NDIS_STATUS Status)
+{
+    PNDIS_REQUEST pRequest = &pNetFlt->u.s.WinIf.PassDownRequest;
+
+    switch (pRequest->DATA.SET_INFORMATION.Oid)
+    {
+        case OID_GEN_CURRENT_PACKET_FILTER:
+        {
+            if (VBOXNETFLT_PROMISCUOUS_SUPPORTED(pNetFlt))
+            {
+                Assert(Status == NDIS_STATUS_SUCCESS);
+                if (pNetFlt->u.s.WinIf.StateFlags.fProcessingPacketFilter)
+                {
+                    if (pNetFlt->u.s.WinIf.StateFlags.fPPFNetFlt)
+                    {
+                        Assert(pNetFlt->enmTrunkState == INTNETTRUNKIFSTATE_ACTIVE);
+                        pNetFlt->u.s.WinIf.StateFlags.fPPFNetFlt = 0;
+                        if (Status == NDIS_STATUS_SUCCESS)
+                        {
+                            if (pRequest->DATA.SET_INFORMATION.InformationBufferLength >= sizeof (ULONG))
+                            {
+                                pNetFlt->u.s.WinIf.fOurSetFilter = *((PULONG)pRequest->DATA.SET_INFORMATION.InformationBuffer);
+                                Assert(pNetFlt->u.s.WinIf.fOurSetFilter == NDIS_PACKET_TYPE_PROMISCUOUS);
+                            }
+                            else
+                            {
+                                AssertFailed();
+                                *pNetFlt->u.s.WinIf.pcPDRBytesNeeded = sizeof (ULONG);
+                                Status = NDIS_STATUS_RESOURCES;
+                            }
+                        }
+                        vboxNetFltWinDereferenceNetFlt(pNetFlt);
+                    }
+                    else
+                    {
+                        Assert(pNetFlt->enmTrunkState != INTNETTRUNKIFSTATE_ACTIVE);
+
+                        if (Status == NDIS_STATUS_SUCCESS)
+                        {
+                            if (pRequest->DATA.SET_INFORMATION.InformationBufferLength >= sizeof (ULONG))
+                            {
+                                /* the request was issued when the netflt was not active, simply update the cache here */
+                                pNetFlt->u.s.WinIf.fUpperProtocolSetFilter = *((PULONG)pRequest->DATA.SET_INFORMATION.InformationBuffer);
+                                pNetFlt->u.s.WinIf.StateFlags.fUpperProtSetFilterInitialized = TRUE;
+                            }
+                            else
+                            {
+                                AssertFailed();
+                                *pNetFlt->u.s.WinIf.pcPDRBytesNeeded = sizeof (ULONG);
+                                Status = NDIS_STATUS_RESOURCES;
+                            }
+                        }
+                        vboxNetFltWinDereferenceModePassThru(pNetFlt);
+                    }
+
+                    pNetFlt->u.s.WinIf.StateFlags.fProcessingPacketFilter = 0;
+                    vboxNetFltWinDereferenceWinIf(pNetFlt);
+                }
+#ifdef DEBUG_misha
+                else
+                {
+                    AssertFailed();
+                }
+#endif
+            }
+            break;
+        }
+
+        default:
+            Assert(pRequest->DATA.SET_INFORMATION.Oid != OID_PNP_SET_POWER);
+            break;
+    }
+
+    *pNetFlt->u.s.WinIf.pcPDRBytesRW = pRequest->DATA.SET_INFORMATION.BytesRead;
+    *pNetFlt->u.s.WinIf.pcPDRBytesNeeded = pRequest->DATA.SET_INFORMATION.BytesNeeded;
+
+    return Status;
+}
+
+DECLHIDDEN(VOID) vboxNetFltWinPtRequestComplete(NDIS_HANDLE hContext, PNDIS_REQUEST pNdisRequest, NDIS_STATUS Status)
+{
+    PVBOXNETFLTINS pNetFlt = (PVBOXNETFLTINS)hContext;
+    PNDIS_REQUEST pSynchRequest = pNetFlt->u.s.WinIf.pSynchRequest;
+
+    LogFlowFunc(("ENTER: pNetFlt (0x%p), pNdisRequest (0x%p), Status (0x%x)\n", pNetFlt, pNdisRequest, Status));
+
+    if (pSynchRequest == pNdisRequest)
+    {
+        /* asynchronous completion of our sync request */
+        /*1.set the status */
+        pNetFlt->u.s.WinIf.SynchCompletionStatus = Status;
+        /* 2. set event */
+        KeSetEvent(&pNetFlt->u.s.WinIf.hSynchCompletionEvent, 0, FALSE);
+        /* 3. return; */
+
+        LogFlowFunc(("LEAVE: pNetFlt (0x%p), pNdisRequest (0x%p), Status (0x%x)\n", pNetFlt, pNdisRequest, Status));
+        return;
+    }
+
+    Assert(&pNetFlt->u.s.WinIf.PassDownRequest == pNdisRequest);
+    Assert(pNetFlt->u.s.WinIf.StateFlags.fRequestInfo == VBOXNDISREQUEST_INPROGRESS);
+    vboxNetFltWinMpRequestStateComplete(pNetFlt);
+
+    switch (pNdisRequest->RequestType)
+    {
+      case NdisRequestQueryInformation:
+          Status = vboxNetFltWinPtHandleQueryInfoComplete(pNetFlt, Status);
+          NdisMQueryInformationComplete(pNetFlt->u.s.WinIf.hMiniport, Status);
+          break;
+
+      case NdisRequestSetInformation:
+          Status = vboxNetFltWinPtHandleSetInfoComplete(pNetFlt, Status);
+          NdisMSetInformationComplete(pNetFlt->u.s.WinIf.hMiniport, Status);
+          break;
+
+      default:
+          AssertFailed();
+          break;
+    }
+
+    LogFlowFunc(("LEAVE: pNetFlt (0x%p), pNdisRequest (0x%p), Status (0x%x)\n", pNetFlt, pNdisRequest, Status));
+}
+
+static VOID vboxNetFltWinPtStatus(IN NDIS_HANDLE hProtocolBindingContext, IN NDIS_STATUS GeneralStatus, IN PVOID pvStatusBuffer, IN UINT cbStatusBuffer)
+{
+    PVBOXNETFLTINS pNetFlt = (PVBOXNETFLTINS)hProtocolBindingContext;
+
+    LogFlowFunc(("ENTER: pNetFlt (0x%p), GeneralStatus (0x%x)\n", pNetFlt, GeneralStatus));
+
+    if (vboxNetFltWinReferenceWinIf(pNetFlt))
+    {
+        Assert(pNetFlt->u.s.WinIf.hMiniport);
+
+        if (VBOXNETFLT_PT_STATUS_IS_FILTERED(GeneralStatus))
+        {
+            pNetFlt->u.s.WinIf.MpIndicatedMediaStatus = GeneralStatus;
+        }
+        NdisMIndicateStatus(pNetFlt->u.s.WinIf.hMiniport,
+                            GeneralStatus,
+                            pvStatusBuffer,
+                            cbStatusBuffer);
+
+        vboxNetFltWinDereferenceWinIf(pNetFlt);
+    }
+    else
+    {
+        if (pNetFlt->u.s.WinIf.hMiniport != NULL
+                && VBOXNETFLT_PT_STATUS_IS_FILTERED(GeneralStatus)
+           )
+        {
+            pNetFlt->u.s.WinIf.MpUnindicatedMediaStatus = GeneralStatus;
+        }
+    }
+
+    LogFlowFunc(("LEAVE: pNetFlt (0x%p), GeneralStatus (0x%x)\n", pNetFlt, GeneralStatus));
+}
+
+
+static VOID vboxNetFltWinPtStatusComplete(IN NDIS_HANDLE hProtocolBindingContext)
+{
+    PVBOXNETFLTINS pNetFlt = (PVBOXNETFLTINS)hProtocolBindingContext;
+
+    LogFlowFunc(("ENTER: pNetFlt (0x%p)\n", pNetFlt));
+
+    if (vboxNetFltWinReferenceWinIf(pNetFlt))
+    {
+        NdisMIndicateStatusComplete(pNetFlt->u.s.WinIf.hMiniport);
+
+        vboxNetFltWinDereferenceWinIf(pNetFlt);
+    }
+
+    LogFlowFunc(("LEAVE: pNetFlt (0x%p)\n", pNetFlt));
+}
+
+static VOID vboxNetFltWinPtSendComplete(IN NDIS_HANDLE hProtocolBindingContext, IN PNDIS_PACKET pPacket, IN NDIS_STATUS Status)
+{
+    PVBOXNETFLTINS pNetFlt = (PVBOXNETFLTINS)hProtocolBindingContext;
+    PVBOXNETFLT_PKTRSVD_PT pSendInfo = (PVBOXNETFLT_PKTRSVD_PT)pPacket->ProtocolReserved;
+    PNDIS_PACKET pOrigPacket = pSendInfo->pOrigPacket;
+    PVOID pBufToFree = pSendInfo->pBufToFree;
+    LogFlowFunc(("ENTER: pNetFlt (0x%p), pPacket (0x%p), Status (0x%x)\n", pNetFlt, pPacket, Status));
+
+#if defined(DEBUG_NETFLT_PACKETS) || !defined(VBOX_LOOPBACK_USEFLAGS)
+    /** @todo for optimization we could check only for netflt-mode packets
+     * do it for all for now */
+     vboxNetFltWinLbRemoveSendPacket(pNetFlt, pPacket);
+#endif
+
+     if (pOrigPacket)
+     {
+         NdisIMCopySendCompletePerPacketInfo(pOrigPacket, pPacket);
+         NdisFreePacket(pPacket);
+         /* the ptk was posted from the upperlying protocol */
+         NdisMSendComplete(pNetFlt->u.s.WinIf.hMiniport, pOrigPacket, Status);
+     }
+     else
+     {
+         /* if the pOrigPacket is zero - the ptk was originated by netFlt send/receive
+          * need to free packet buffers */
+         vboxNetFltWinFreeSGNdisPacket(pPacket, !pBufToFree);
+     }
+
+     if (pBufToFree)
+     {
+         vboxNetFltWinMemFree(pBufToFree);
+     }
+
+    vboxNetFltWinDereferenceWinIf(pNetFlt);
+
+    LogFlowFunc(("LEAVE: pNetFlt (0x%p), pPacket (0x%p), Status (0x%x)\n", pNetFlt, pPacket, Status));
+}
+
+/**
+ * removes searches for the packet in the list and removes it if found
+ * @return true if the packet was found and removed, false - otherwise
+ */
+static bool vboxNetFltWinRemovePacketFromList(PVBOXNETFLT_INTERLOCKED_SINGLE_LIST pList, PNDIS_PACKET pPacket)
+{
+    PVBOXNETFLT_PKTRSVD_TRANSFERDATA_PT pTDR = (PVBOXNETFLT_PKTRSVD_TRANSFERDATA_PT)pPacket->ProtocolReserved;
+    return vboxNetFltWinInterlockedSearchListEntry(pList, &pTDR->ListEntry, true /* remove*/);
+}
+
+/**
+ * puts the packet to the tail of the list
+ */
+static void vboxNetFltWinPutPacketToList(PVBOXNETFLT_INTERLOCKED_SINGLE_LIST pList, PNDIS_PACKET pPacket, PNDIS_BUFFER pOrigBuffer)
+{
+    PVBOXNETFLT_PKTRSVD_TRANSFERDATA_PT pTDR = (PVBOXNETFLT_PKTRSVD_TRANSFERDATA_PT)pPacket->ProtocolReserved;
+    pTDR->pOrigBuffer = pOrigBuffer;
+    vboxNetFltWinInterlockedPutTail(pList, &pTDR->ListEntry);
+}
+
+static bool vboxNetFltWinPtTransferDataCompleteActive(PVBOXNETFLTINS pNetFltIf, PNDIS_PACKET pPacket, NDIS_STATUS Status)
+{
+    PNDIS_BUFFER pBuffer;
+    PVBOXNETFLT_PKTRSVD_TRANSFERDATA_PT pTDR;
+
+    if (!vboxNetFltWinRemovePacketFromList(&pNetFltIf->u.s.WinIf.TransferDataList, pPacket))
+        return false;
+
+    pTDR = (PVBOXNETFLT_PKTRSVD_TRANSFERDATA_PT)pPacket->ProtocolReserved;
+    Assert(pTDR);
+    Assert(pTDR->pOrigBuffer);
+
+    do
+    {
+        NdisUnchainBufferAtFront(pPacket, &pBuffer);
+
+        Assert(pBuffer);
+
+        NdisFreeBuffer(pBuffer);
+
+        pBuffer = pTDR->pOrigBuffer;
+
+        NdisChainBufferAtBack(pPacket, pBuffer);
+
+        /* data transfer was initiated when the netFlt was active
+         * the netFlt is still retained by us
+         * 1. check if loopback
+         * 2. enqueue packet
+         * 3. release netFlt */
+
+        if (Status == NDIS_STATUS_SUCCESS)
+        {
+
+#ifdef VBOX_LOOPBACK_USEFLAGS
+            if (vboxNetFltWinIsLoopedBackPacket(pPacket))
+            {
+                /* should not be here */
+                AssertFailed();
+            }
+#else
+            PNDIS_PACKET pLb = vboxNetFltWinLbSearchLoopBack(pNetFltIf, pPacket, false);
+            if (pLb)
+            {
+#ifndef DEBUG_NETFLT_RECV_TRANSFERDATA
+                /* should not be here */
+                AssertFailed();
+#endif
+                if (!vboxNetFltWinLbIsFromIntNet(pLb))
+                {
+                    /* the packet is not from int net, need to pass it up to the host */
+                    NdisMIndicateReceivePacket(pNetFltIf->u.s.WinIf.hMiniport, &pPacket, 1);
+                    /* dereference NetFlt, WinIf will be dereferenced on Packet return */
+                    vboxNetFltWinDereferenceNetFlt(pNetFltIf);
+                    break;
+                }
+            }
+#endif
+            else
+            {
+                /* 2. enqueue */
+                /* use the same packet info to put the packet in the processing packet queue */
+                PVBOXNETFLT_PKTRSVD_MP pRecvInfo = (PVBOXNETFLT_PKTRSVD_MP)pPacket->MiniportReserved;
+
+                VBOXNETFLT_LBVERIFY(pNetFltIf, pPacket);
+
+                pRecvInfo->pOrigPacket = NULL;
+                pRecvInfo->pBufToFree = NULL;
+
+                NdisGetPacketFlags(pPacket) = 0;
+# ifdef VBOXNETFLT_NO_PACKET_QUEUE
+                if (vboxNetFltWinPostIntnet(pNetFltIf, pPacket, 0))
+                {
+                    /* drop it */
+                    vboxNetFltWinFreeSGNdisPacket(pPacket, true);
+                    vboxNetFltWinDereferenceWinIf(pNetFltIf);
+                }
+                else
+                {
+                    NdisMIndicateReceivePacket(pNetFltIf->u.s.WinIf.hMiniport, &pPacket, 1);
+                }
+                vboxNetFltWinDereferenceNetFlt(pNetFltIf);
+                break;
+# else
+                Status = vboxNetFltWinQuEnqueuePacket(pNetFltIf, pPacket, PACKET_MINE);
+                if (Status == NDIS_STATUS_SUCCESS)
+                {
+                    break;
+                }
+                AssertFailed();
+# endif
+            }
+        }
+        else
+        {
+            AssertFailed();
+        }
+        /* we are here because of error either in data transfer or in enqueueing the packet */
+        vboxNetFltWinFreeSGNdisPacket(pPacket, true);
+        vboxNetFltWinDereferenceNetFlt(pNetFltIf);
+        vboxNetFltWinDereferenceWinIf(pNetFltIf);
+    } while (0);
+
+    return true;
+}
+
+static VOID vboxNetFltWinPtTransferDataComplete(IN NDIS_HANDLE hProtocolBindingContext,
+                    IN PNDIS_PACKET pPacket,
+                    IN NDIS_STATUS Status,
+                    IN UINT cbTransferred)
+{
+    PVBOXNETFLTINS pNetFlt = (PVBOXNETFLTINS)hProtocolBindingContext;
+    LogFlowFunc(("ENTER: pNetFlt (0x%p), pPacket (0x%p), Status (0x%x), cbTransfered (%d)\n", pNetFlt, pPacket, Status, cbTransferred));
+    if (!vboxNetFltWinPtTransferDataCompleteActive(pNetFlt, pPacket, Status))
+    {
+        if (pNetFlt->u.s.WinIf.hMiniport)
+        {
+            NdisMTransferDataComplete(pNetFlt->u.s.WinIf.hMiniport,
+                                      pPacket,
+                                      Status,
+                                      cbTransferred);
+        }
+
+        vboxNetFltWinDereferenceWinIf(pNetFlt);
+    }
+    /* else - all processing is done with vboxNetFltWinPtTransferDataCompleteActive already */
+
+    LogFlowFunc(("LEAVE: pNetFlt (0x%p), pPacket (0x%p), Status (0x%x), cbTransfered (%d)\n", pNetFlt, pPacket, Status, cbTransferred));
+}
+
+static INT vboxNetFltWinRecvPacketPassThru(PVBOXNETFLTINS pNetFlt, PNDIS_PACKET pPacket)
+{
+    Assert(KeGetCurrentIrql() == DISPATCH_LEVEL);
+
+    PNDIS_PACKET pMyPacket;
+    NDIS_STATUS Status = vboxNetFltWinPrepareRecvPacket(pNetFlt, pPacket, &pMyPacket, true);
+    /* the Status holds the current packet status it will be checked for NDIS_STATUS_RESOURCES later
+     * (see below) */
+    Assert(pMyPacket);
+    if (pMyPacket)
+    {
+        NdisMIndicateReceivePacket(pNetFlt->u.s.WinIf.hMiniport, &pMyPacket, 1);
+        if (Status == NDIS_STATUS_RESOURCES)
+        {
+            NdisDprFreePacket(pMyPacket);
+            return 0;
+        }
+
+        return 1;
+    }
+
+    return 0;
+}
+
+/**
+ * process the packet receive in a "passthru" mode
+ */
+static NDIS_STATUS vboxNetFltWinRecvPassThru(PVBOXNETFLTINS pNetFlt, PNDIS_PACKET pPacket)
+{
+    Assert(KeGetCurrentIrql() == DISPATCH_LEVEL);
+
+    NDIS_STATUS Status;
+    PNDIS_PACKET pMyPacket;
+
+    NdisDprAllocatePacket(&Status, &pMyPacket, pNetFlt->u.s.WinIf.hRecvPacketPool);
+    Assert(Status == NDIS_STATUS_SUCCESS);
+    if (Status == NDIS_STATUS_SUCCESS)
+    {
+        vboxNetFltWinCopyPacketInfoOnRecv(pMyPacket, pPacket, true /* force NDIS_STATUS_RESOURCES */);
+        Assert(NDIS_GET_PACKET_STATUS(pMyPacket) == NDIS_STATUS_RESOURCES);
+
+        NdisMIndicateReceivePacket(pNetFlt->u.s.WinIf.hMiniport, &pMyPacket, 1);
+
+        NdisDprFreePacket(pMyPacket);
+    }
+    return Status;
+}
+
+static VOID vboxNetFltWinRecvIndicatePassThru(PVBOXNETFLTINS pNetFlt, NDIS_HANDLE MacReceiveContext,
+                PVOID pHeaderBuffer, UINT cbHeaderBuffer, PVOID pLookAheadBuffer, UINT cbLookAheadBuffer, UINT cbPacket)
+{
+    /* Note: we're using KeGetCurrentProcessorNumber, which is not entirely correct in case
+    * we're running on 64bit win7+, which can handle > 64 CPUs, however since KeGetCurrentProcessorNumber
+    * always returns the number < than the number of CPUs in the first group, we're guaranteed to have CPU index < 64
+    * @todo: use KeGetCurrentProcessorNumberEx for Win7+ 64 and dynamically extended array */
+    ULONG Proc = KeGetCurrentProcessorNumber();
+    Assert(Proc < RT_ELEMENTS(pNetFlt->u.s.WinIf.abIndicateRxComplete));
+    pNetFlt->u.s.WinIf.abIndicateRxComplete[Proc] = TRUE;
+    switch (pNetFlt->u.s.WinIf.enmMedium)
+    {
+        case NdisMedium802_3:
+        case NdisMediumWan:
+            NdisMEthIndicateReceive(pNetFlt->u.s.WinIf.hMiniport,
+                                         MacReceiveContext,
+                                         (PCHAR)pHeaderBuffer,
+                                         cbHeaderBuffer,
+                                         pLookAheadBuffer,
+                                         cbLookAheadBuffer,
+                                         cbPacket);
+            break;
+        default:
+            AssertFailed();
+            break;
+    }
+}
+
+/**
+ * process the ProtocolReceive in an "active" mode
+ *
+ * @return NDIS_STATUS_SUCCESS - the packet is processed
+ * NDIS_STATUS_PENDING - the packet is being processed, we are waiting for the ProtocolTransferDataComplete to be called
+ * NDIS_STATUS_NOT_ACCEPTED - the packet is not needed - typically this is because this is a loopback packet
+ * NDIS_STATUS_FAILURE - packet processing failed
+ */
+static NDIS_STATUS vboxNetFltWinPtReceiveActive(PVBOXNETFLTINS pNetFlt, NDIS_HANDLE MacReceiveContext, PVOID pHeaderBuffer, UINT cbHeaderBuffer,
+                        PVOID pLookaheadBuffer, UINT cbLookaheadBuffer, UINT cbPacket)
+{
+    NDIS_STATUS Status = NDIS_STATUS_SUCCESS;
+
+    do
+    {
+        if (cbHeaderBuffer != VBOXNETFLT_PACKET_ETHEADER_SIZE)
+        {
+            Status = NDIS_STATUS_NOT_ACCEPTED;
+            break;
+        }
+
+#ifndef DEBUG_NETFLT_RECV_TRANSFERDATA
+        if (cbPacket == cbLookaheadBuffer)
+        {
+            PINTNETSG pSG;
+            PUCHAR pRcvData;
+#ifndef VBOX_LOOPBACK_USEFLAGS
+            PNDIS_PACKET pLb;
+#endif
+
+            /* allocate SG buffer */
+            Status = vboxNetFltWinAllocSG(cbPacket + cbHeaderBuffer, &pSG);
+            if (Status != NDIS_STATUS_SUCCESS)
+            {
+                AssertFailed();
+                break;
+            }
+
+            pRcvData = (PUCHAR)pSG->aSegs[0].pv;
+
+            NdisMoveMappedMemory(pRcvData, pHeaderBuffer, cbHeaderBuffer);
+
+            NdisCopyLookaheadData(pRcvData+cbHeaderBuffer,
+                                                  pLookaheadBuffer,
+                                                  cbLookaheadBuffer,
+                                                  pNetFlt->u.s.WinIf.fMacOptions);
+#ifndef VBOX_LOOPBACK_USEFLAGS
+            pLb = vboxNetFltWinLbSearchLoopBackBySG(pNetFlt, pSG, false);
+            if (pLb)
+            {
+#ifndef DEBUG_NETFLT_RECV_NOPACKET
+                /* should not be here */
+                AssertFailed();
+#endif
+                if (!vboxNetFltWinLbIsFromIntNet(pLb))
+                {
+                    PNDIS_PACKET pMyPacket;
+                    pMyPacket = vboxNetFltWinNdisPacketFromSG(pNetFlt, /* PVBOXNETFLTINS */
+                        pSG, /* PINTNETSG */
+                        pSG, /* PVOID pBufToFree */
+                        false, /* bool bToWire */
+                        false); /* bool bCopyMemory */
+                    if (pMyPacket)
+                    {
+                        NdisMIndicateReceivePacket(pNetFlt->u.s.WinIf.hMiniport, &pMyPacket, 1);
+                        /* dereference the NetFlt here & indicate SUCCESS, which would mean the caller would not do a dereference
+                         * the WinIf dereference will be done on packet return */
+                        vboxNetFltWinDereferenceNetFlt(pNetFlt);
+                        Status = NDIS_STATUS_SUCCESS;
+                    }
+                    else
+                    {
+                        vboxNetFltWinMemFree(pSG);
+                        Status = NDIS_STATUS_FAILURE;
+                    }
+                }
+                else
+                {
+                    vboxNetFltWinMemFree(pSG);
+                    Status = NDIS_STATUS_NOT_ACCEPTED;
+                }
+                break;
+            }
+#endif
+            VBOXNETFLT_LBVERIFYSG(pNetFlt, pSG);
+
+                /* enqueue SG */
+# ifdef VBOXNETFLT_NO_PACKET_QUEUE
+            if (vboxNetFltWinPostIntnet(pNetFlt, pSG, VBOXNETFLT_PACKET_SG))
+            {
+                /* drop it */
+                vboxNetFltWinMemFree(pSG);
+                vboxNetFltWinDereferenceWinIf(pNetFlt);
+            }
+            else
+            {
+                PNDIS_PACKET pMyPacket = vboxNetFltWinNdisPacketFromSG(pNetFlt, /* PVBOXNETFLTINS */
+                        pSG, /* PINTNETSG */
+                        pSG, /* PVOID pBufToFree */
+                        false, /* bool bToWire */
+                        false); /* bool bCopyMemory */
+                Assert(pMyPacket);
+                if (pMyPacket)
+                {
+                    NDIS_SET_PACKET_STATUS(pMyPacket, NDIS_STATUS_SUCCESS);
+
+                    DBG_CHECK_PACKET_AND_SG(pMyPacket, pSG);
+
+                    LogFlow(("non-ndis packet info, packet created (%p)\n", pMyPacket));
+                    NdisMIndicateReceivePacket(pNetFlt->u.s.WinIf.hMiniport, &pMyPacket, 1);
+                }
+                else
+                {
+                    vboxNetFltWinDereferenceWinIf(pNetFlt);
+                    Status = NDIS_STATUS_RESOURCES;
+                }
+            }
+            vboxNetFltWinDereferenceNetFlt(pNetFlt);
+# else
+            Status = vboxNetFltWinQuEnqueuePacket(pNetFlt, pSG, PACKET_SG | PACKET_MINE);
+            if (Status != NDIS_STATUS_SUCCESS)
+            {
+                AssertFailed();
+                vboxNetFltWinMemFree(pSG);
+                break;
+            }
+# endif
+#endif
+        }
+        else
+        {
+            PNDIS_PACKET pPacket;
+            PNDIS_BUFFER pTransferBuffer;
+            PNDIS_BUFFER pOrigBuffer;
+            PUCHAR pMemBuf;
+            UINT cbBuf = cbPacket + cbHeaderBuffer;
+            UINT cbTransferred;
+
+            /* allocate NDIS Packet buffer */
+            NdisAllocatePacket(&Status, &pPacket, pNetFlt->u.s.WinIf.hRecvPacketPool);
+            if (Status != NDIS_STATUS_SUCCESS)
+            {
+                AssertFailed();
+                break;
+            }
+
+            VBOXNETFLT_OOB_INIT(pPacket);
+
+#ifdef VBOX_LOOPBACK_USEFLAGS
+            /* set "don't loopback" flags */
+            NdisGetPacketFlags(pPacket) = g_VBoxNetFltGlobalsWin.fPacketDontLoopBack;
+#else
+            NdisGetPacketFlags(pPacket) =  0;
+#endif
+
+            Status = vboxNetFltWinMemAlloc((PVOID*)(&pMemBuf), cbBuf);
+            if (Status != NDIS_STATUS_SUCCESS)
+            {
+                AssertFailed();
+                NdisFreePacket(pPacket);
+                break;
+            }
+            NdisAllocateBuffer(&Status, &pTransferBuffer, pNetFlt->u.s.WinIf.hRecvBufferPool, pMemBuf + cbHeaderBuffer, cbPacket);
+            if (Status != NDIS_STATUS_SUCCESS)
+            {
+                AssertFailed();
+                Status = NDIS_STATUS_FAILURE;
+                NdisFreePacket(pPacket);
+                vboxNetFltWinMemFree(pMemBuf);
+                break;
+            }
+
+            NdisAllocateBuffer(&Status, &pOrigBuffer, pNetFlt->u.s.WinIf.hRecvBufferPool, pMemBuf, cbBuf);
+            if (Status != NDIS_STATUS_SUCCESS)
+            {
+                AssertFailed();
+                Status = NDIS_STATUS_FAILURE;
+                NdisFreeBuffer(pTransferBuffer);
+                NdisFreePacket(pPacket);
+                vboxNetFltWinMemFree(pMemBuf);
+                break;
+            }
+
+            NdisChainBufferAtBack(pPacket, pTransferBuffer);
+
+            NdisMoveMappedMemory(pMemBuf, pHeaderBuffer, cbHeaderBuffer);
+
+            vboxNetFltWinPutPacketToList(&pNetFlt->u.s.WinIf.TransferDataList, pPacket, pOrigBuffer);
+
+#ifdef DEBUG_NETFLT_RECV_TRANSFERDATA
+            if (cbPacket == cbLookaheadBuffer)
+            {
+                NdisCopyLookaheadData(pMemBuf+cbHeaderBuffer,
+                                                  pLookaheadBuffer,
+                                                  cbLookaheadBuffer,
+                                                  pNetFlt->u.s.WinIf.fMacOptions);
+            }
+            else
+#endif
+            {
+                Assert(cbPacket > cbLookaheadBuffer);
+
+                NdisTransferData(&Status, pNetFlt->u.s.WinIf.hBinding, MacReceiveContext,
+                        0,  /* ByteOffset */
+                        cbPacket, pPacket, &cbTransferred);
+            }
+
+            if (Status != NDIS_STATUS_PENDING)
+            {
+                vboxNetFltWinPtTransferDataComplete(pNetFlt, pPacket, Status, cbTransferred);
+            }
+        }
+    } while (0);
+
+    return Status;
+}
+
+static NDIS_STATUS vboxNetFltWinPtReceive(IN NDIS_HANDLE hProtocolBindingContext,
+                        IN NDIS_HANDLE MacReceiveContext,
+                        IN PVOID pHeaderBuffer,
+                        IN UINT cbHeaderBuffer,
+                        IN PVOID pLookAheadBuffer,
+                        IN UINT cbLookAheadBuffer,
+                        IN UINT cbPacket)
+{
+    PVBOXNETFLTINS pNetFlt = (PVBOXNETFLTINS)hProtocolBindingContext;
+    PNDIS_PACKET pPacket = NULL;
+    NDIS_STATUS Status = NDIS_STATUS_SUCCESS;
+    bool bNetFltActive;
+    bool fWinIfActive = vboxNetFltWinReferenceWinIfNetFlt(pNetFlt, &bNetFltActive);
+    const bool bPassThruActive = !bNetFltActive;
+
+    LogFlowFunc(("ENTER: pNetFlt (0x%p)\n", pNetFlt));
+
+    if (fWinIfActive)
+    {
+        do
+        {
+#ifndef DEBUG_NETFLT_RECV_NOPACKET
+            pPacket = NdisGetReceivedPacket(pNetFlt->u.s.WinIf.hBinding, MacReceiveContext);
+            if (pPacket)
+            {
+# ifndef VBOX_LOOPBACK_USEFLAGS
+                PNDIS_PACKET pLb = NULL;
+# else
+                if (vboxNetFltWinIsLoopedBackPacket(pPacket))
+                {
+                    AssertFailed();
+                    /* nothing else to do here, just return the packet */
+                    //NdisReturnPackets(&pPacket, 1);
+                    Status = NDIS_STATUS_NOT_ACCEPTED;
+                    break;
+                }
+
+                VBOXNETFLT_LBVERIFY(pNetFlt, pPacket);
+# endif
+
+                if (bNetFltActive)
+                {
+# ifndef VBOX_LOOPBACK_USEFLAGS
+                    pLb = vboxNetFltWinLbSearchLoopBack(pNetFlt, pPacket, false);
+                    if (!pLb)
+# endif
+                    {
+                        VBOXNETFLT_LBVERIFY(pNetFlt, pPacket);
+
+# ifdef VBOXNETFLT_NO_PACKET_QUEUE
+                        if (vboxNetFltWinPostIntnet(pNetFlt, pPacket, 0))
+                        {
+                            /* drop it */
+                            break;
+                        }
+# else
+                        Status = vboxNetFltWinQuEnqueuePacket(pNetFlt, pPacket, PACKET_COPY);
+                        Assert(Status == NDIS_STATUS_SUCCESS);
+                        if (Status == NDIS_STATUS_SUCCESS)
+                        {
+                            //NdisReturnPackets(&pPacket, 1);
+                            fWinIfActive = false;
+                            bNetFltActive = false;
+                            break;
+                        }
+# endif
+                    }
+# ifndef VBOX_LOOPBACK_USEFLAGS
+                    else if (vboxNetFltWinLbIsFromIntNet(pLb))
+                    {
+                        /* nothing else to do here, just return the packet */
+                        //NdisReturnPackets(&pPacket, 1);
+                        Status = NDIS_STATUS_NOT_ACCEPTED;
+                        break;
+                    }
+                    /* we are here because this is a looped back packet set not from intnet
+                     * we will post it to the upper protocol */
+# endif
+                }
+
+                Assert(Status == STATUS_SUCCESS);
+                if (Status == STATUS_SUCCESS)
+                {
+# ifndef VBOX_LOOPBACK_USEFLAGS
+                    Assert(!pLb || !vboxNetFltWinLbIsFromIntNet(pLb));
+# endif
+                    Status = vboxNetFltWinRecvPassThru(pNetFlt, pPacket);
+                    Assert(Status == STATUS_SUCCESS);
+                    /* we are done with packet processing, and we will
+                     * not receive packet return event for this packet,
+                     * fWinIfActive should be true to ensure we release WinIf*/
+                    Assert(fWinIfActive);
+                    if (Status == STATUS_SUCCESS)
+                        break;
+                }
+                else
+                {
+                    /* intnet processing failed - fall back to no-packet mode */
+                    Assert(bNetFltActive);
+                    Assert(fWinIfActive);
+                }
+
+            }
+#endif /* #ifndef DEBUG_NETFLT_RECV_NOPACKET */
+
+            if (bNetFltActive)
+            {
+                Status = vboxNetFltWinPtReceiveActive(pNetFlt, MacReceiveContext, pHeaderBuffer, cbHeaderBuffer,
+                        pLookAheadBuffer, cbLookAheadBuffer, cbPacket);
+                if (NT_SUCCESS(Status))
+                {
+                    if (Status != NDIS_STATUS_NOT_ACCEPTED)
+                    {
+                        fWinIfActive = false;
+                        bNetFltActive = false;
+                    }
+                    else
+                    {
+#ifndef VBOX_LOOPBACK_USEFLAGS
+                        /* this is a loopback packet, nothing to do here */
+#else
+                        AssertFailed();
+                        /* should not be here */
+#endif
+                    }
+                    break;
+                }
+            }
+
+            /* we are done with packet processing, and we will
+             * not receive packet return event for this packet,
+             * fWinIfActive should be true to ensure we release WinIf*/
+            Assert(fWinIfActive);
+
+            vboxNetFltWinRecvIndicatePassThru(pNetFlt, MacReceiveContext, pHeaderBuffer, cbHeaderBuffer, pLookAheadBuffer, cbLookAheadBuffer, cbPacket);
+            /* the status could contain an error value here in case the IntNet recv failed,
+             * ensure we return back success status */
+            Status = NDIS_STATUS_SUCCESS;
+
+        } while (0);
+
+        if (bNetFltActive)
+        {
+            vboxNetFltWinDereferenceNetFlt(pNetFlt);
+        }
+        else if (bPassThruActive)
+        {
+            vboxNetFltWinDereferenceModePassThru(pNetFlt);
+        }
+        if (fWinIfActive)
+        {
+            vboxNetFltWinDereferenceWinIf(pNetFlt);
+        }
+    }
+    else
+    {
+        Status = NDIS_STATUS_FAILURE;
+    }
+
+    LogFlowFunc(("LEAVE: pNetFlt (0x%p)\n", pNetFlt));
+
+    return Status;
+
+}
+
+static VOID vboxNetFltWinPtReceiveComplete(NDIS_HANDLE hProtocolBindingContext)
+{
+    PVBOXNETFLTINS pNetFlt = (PVBOXNETFLTINS)hProtocolBindingContext;
+    bool fNetFltActive;
+    bool fWinIfActive = vboxNetFltWinReferenceWinIfNetFlt(pNetFlt, &fNetFltActive);
+    NDIS_HANDLE hMiniport = pNetFlt->u.s.WinIf.hMiniport;
+    /* Note: we're using KeGetCurrentProcessorNumber, which is not entirely correct in case
+    * we're running on 64bit win7+, which can handle > 64 CPUs, however since KeGetCurrentProcessorNumber
+    * always returns the number < than the number of CPUs in the first group, we're guaranteed to have CPU index < 64
+    * @todo: use KeGetCurrentProcessorNumberEx for Win7+ 64 and dynamically extended array */
+    ULONG iProc = KeGetCurrentProcessorNumber();
+    Assert(iProc < RT_ELEMENTS(pNetFlt->u.s.WinIf.abIndicateRxComplete));
+
+    LogFlowFunc(("ENTER: pNetFlt (0x%p)\n", pNetFlt));
+
+    if (hMiniport != NULL && pNetFlt->u.s.WinIf.abIndicateRxComplete[iProc])
+    {
+        switch (pNetFlt->u.s.WinIf.enmMedium)
+        {
+            case NdisMedium802_3:
+            case NdisMediumWan:
+                NdisMEthIndicateReceiveComplete(hMiniport);
+                break;
+            default:
+                AssertFailed();
+                break;
+        }
+    }
+
+    pNetFlt->u.s.WinIf.abIndicateRxComplete[iProc] = FALSE;
+
+    if (fWinIfActive)
+    {
+        if (fNetFltActive)
+            vboxNetFltWinDereferenceNetFlt(pNetFlt);
+        else
+            vboxNetFltWinDereferenceModePassThru(pNetFlt);
+        vboxNetFltWinDereferenceWinIf(pNetFlt);
+    }
+
+    LogFlowFunc(("LEAVE: pNetFlt (0x%p)\n", pNetFlt));
+}
+
+static INT vboxNetFltWinPtReceivePacket(NDIS_HANDLE hProtocolBindingContext, PNDIS_PACKET pPacket)
+{
+    PVBOXNETFLTINS pNetFlt = (PVBOXNETFLTINS)hProtocolBindingContext;
+    INT cRefCount = 0;
+    bool bNetFltActive;
+    bool fWinIfActive = vboxNetFltWinReferenceWinIfNetFlt(pNetFlt, &bNetFltActive);
+    const bool bPassThruActive = !bNetFltActive;
+
+    LogFlowFunc(("ENTER: pNetFlt (0x%p)\n", pNetFlt));
+
+    if (fWinIfActive)
+    {
+        do
+        {
+#ifdef VBOX_LOOPBACK_USEFLAGS
+            if (vboxNetFltWinIsLoopedBackPacket(pPacket))
+            {
+                AssertFailed();
+                Log(("lb_rp"));
+
+                /* nothing else to do here, just return the packet */
+                cRefCount = 0;
+                //NdisReturnPackets(&pPacket, 1);
+                break;
+            }
+
+            VBOXNETFLT_LBVERIFY(pNetFlt, pPacket);
+#endif
+
+            if (bNetFltActive)
+            {
+#ifndef VBOX_LOOPBACK_USEFLAGS
+                PNDIS_PACKET pLb = vboxNetFltWinLbSearchLoopBack(pNetFlt, pPacket, false);
+                if (!pLb)
+#endif
+                {
+#ifndef VBOXNETFLT_NO_PACKET_QUEUE
+                    NDIS_STATUS fStatus;
+#endif
+                    bool fResources = NDIS_GET_PACKET_STATUS(pPacket) == NDIS_STATUS_RESOURCES; NOREF(fResources);
+
+                    VBOXNETFLT_LBVERIFY(pNetFlt, pPacket);
+#ifdef DEBUG_misha
+                    /** @todo remove this assert.
+                     * this is a temporary assert for debugging purposes:
+                     * we're probably doing something wrong with the packets if the miniport reports NDIS_STATUS_RESOURCES */
+                    Assert(!fResources);
+#endif
+
+#ifdef VBOXNETFLT_NO_PACKET_QUEUE
+                    if (vboxNetFltWinPostIntnet(pNetFlt, pPacket, 0))
+                    {
+                        /* drop it */
+                        cRefCount = 0;
+                        break;
+                    }
+
+#else
+                    fStatus = vboxNetFltWinQuEnqueuePacket(pNetFlt, pPacket, fResources ? PACKET_COPY : 0);
+                    if (fStatus == NDIS_STATUS_SUCCESS)
+                    {
+                        bNetFltActive = false;
+                        fWinIfActive = false;
+                        if (fResources)
+                        {
+                            cRefCount = 0;
+                            //NdisReturnPackets(&pPacket, 1);
+                        }
+                        else
+                            cRefCount = 1;
+                        break;
+                    }
+                    else
+                    {
+                        AssertFailed();
+                    }
+#endif
+                }
+#ifndef VBOX_LOOPBACK_USEFLAGS
+                else if (vboxNetFltWinLbIsFromIntNet(pLb))
+                {
+                    /* the packet is from intnet, it has already been set to the host,
+                     * no need for loopng it back to the host again */
+                    /* nothing else to do here, just return the packet */
+                    cRefCount = 0;
+                    //NdisReturnPackets(&pPacket, 1);
+                    break;
+                }
+#endif
+            }
+
+            cRefCount = vboxNetFltWinRecvPacketPassThru(pNetFlt, pPacket);
+            if (cRefCount)
+            {
+                Assert(cRefCount == 1);
+                fWinIfActive = false;
+            }
+
+        } while (FALSE);
+
+        if (bNetFltActive)
+        {
+            vboxNetFltWinDereferenceNetFlt(pNetFlt);
+        }
+        else if (bPassThruActive)
+        {
+            vboxNetFltWinDereferenceModePassThru(pNetFlt);
+        }
+        if (fWinIfActive)
+        {
+            vboxNetFltWinDereferenceWinIf(pNetFlt);
+        }
+    }
+    else
+    {
+        cRefCount = 0;
+        //NdisReturnPackets(&pPacket, 1);
+    }
+
+    LogFlowFunc(("LEAVE: pNetFlt (0x%p), cRefCount (%d)\n", pNetFlt, cRefCount));
+
+    return cRefCount;
+}
+
+DECLHIDDEN(bool) vboxNetFltWinPtCloseInterface(PVBOXNETFLTINS pNetFlt, PNDIS_STATUS pStatus)
+{
+    RTSpinlockAcquire(pNetFlt->hSpinlock);
+
+    if (pNetFlt->u.s.WinIf.StateFlags.fInterfaceClosing)
+    {
+        RTSpinlockRelease(pNetFlt->hSpinlock);
+        AssertFailed();
+        return false;
+    }
+    if (pNetFlt->u.s.WinIf.hBinding == NULL)
+    {
+        RTSpinlockRelease(pNetFlt->hSpinlock);
+        AssertFailed();
+        return false;
+    }
+
+    pNetFlt->u.s.WinIf.StateFlags.fInterfaceClosing = TRUE;
+    RTSpinlockRelease(pNetFlt->hSpinlock);
+
+    NdisResetEvent(&pNetFlt->u.s.WinIf.OpenCloseEvent);
+    NdisCloseAdapter(pStatus, pNetFlt->u.s.WinIf.hBinding);
+    if (*pStatus == NDIS_STATUS_PENDING)
+    {
+        NdisWaitEvent(&pNetFlt->u.s.WinIf.OpenCloseEvent, 0);
+        *pStatus = pNetFlt->u.s.WinIf.OpenCloseStatus;
+    }
+
+    Assert (*pStatus == NDIS_STATUS_SUCCESS);
+
+    pNetFlt->u.s.WinIf.hBinding = NULL;
+
+    return true;
+}
+
+static NDIS_STATUS vboxNetFltWinPtPnPSetPower(PVBOXNETFLTINS pNetFlt, NDIS_DEVICE_POWER_STATE enmPowerState)
+{
+    NDIS_DEVICE_POWER_STATE enmPrevPowerState = vboxNetFltWinGetPowerState(&pNetFlt->u.s.WinIf.PtState);
+
+    RTSpinlockAcquire(pNetFlt->hSpinlock);
+
+    vboxNetFltWinSetPowerState(&pNetFlt->u.s.WinIf.PtState, enmPowerState);
+
+    if (vboxNetFltWinGetPowerState(&pNetFlt->u.s.WinIf.PtState) > NdisDeviceStateD0)
+    {
+        if (enmPrevPowerState == NdisDeviceStateD0)
+        {
+            pNetFlt->u.s.WinIf.StateFlags.fStandBy = TRUE;
+        }
+        RTSpinlockRelease(pNetFlt->hSpinlock);
+        vboxNetFltWinPtRequestsWaitComplete(pNetFlt);
+        vboxNetFltWinWaitDereference(&pNetFlt->u.s.WinIf.MpState);
+        vboxNetFltWinWaitDereference(&pNetFlt->u.s.WinIf.PtState);
+
+        /* check packet pool is empty */
+        UINT cPPUsage = NdisPacketPoolUsage(pNetFlt->u.s.WinIf.hSendPacketPool);
+        Assert(cPPUsage == 0);
+        cPPUsage = NdisPacketPoolUsage(pNetFlt->u.s.WinIf.hRecvPacketPool);
+        Assert(cPPUsage == 0);
+        /* for debugging only, ignore the err in release */
+        NOREF(cPPUsage);
+
+        Assert(!pNetFlt->u.s.WinIf.StateFlags.fRequestInfo);
+    }
+    else
+    {
+        if (enmPrevPowerState > NdisDeviceStateD0)
+        {
+            pNetFlt->u.s.WinIf.StateFlags.fStandBy = FALSE;
+        }
+
+        if (pNetFlt->u.s.WinIf.StateFlags.fRequestInfo & VBOXNDISREQUEST_QUEUED)
+        {
+            pNetFlt->u.s.WinIf.StateFlags.fRequestInfo = VBOXNDISREQUEST_INPROGRESS;
+            RTSpinlockRelease(pNetFlt->hSpinlock);
+
+            vboxNetFltWinMpRequestPost(pNetFlt);
+        }
+        else
+        {
+            RTSpinlockRelease(pNetFlt->hSpinlock);
+        }
+    }
+
+    return NDIS_STATUS_SUCCESS;
+}
+
+
+static NDIS_STATUS vboxNetFltWinPtPnPEvent(IN NDIS_HANDLE hProtocolBindingContext, IN PNET_PNP_EVENT pNetPnPEvent)
+{
+    PVBOXNETFLTINS pNetFlt = (PVBOXNETFLTINS)hProtocolBindingContext;
+
+    LogFlowFunc(("ENTER: pNetFlt (0x%p), NetEvent (%d)\n", pNetFlt, pNetPnPEvent->NetEvent));
+
+    switch (pNetPnPEvent->NetEvent)
+    {
+        case NetEventSetPower:
+        {
+            NDIS_DEVICE_POWER_STATE enmPowerState = *((PNDIS_DEVICE_POWER_STATE)pNetPnPEvent->Buffer);
+            NDIS_STATUS rcNdis = vboxNetFltWinPtPnPSetPower(pNetFlt, enmPowerState);
+            LogFlowFunc(("LEAVE: pNetFlt (0x%p), NetEvent (%d), rcNdis=%#x\n", pNetFlt, pNetPnPEvent->NetEvent, rcNdis));
+            return rcNdis;
+        }
+
+        case NetEventReconfigure:
+        {
+            if (!pNetFlt)
+            {
+                NdisReEnumerateProtocolBindings(g_VBoxNetFltGlobalsWin.Pt.hProtocol);
+            }
+        }
+        /** @todo r=bird: Is the fall thru intentional?? */
+        default:
+            LogFlowFunc(("LEAVE: pNetFlt (0x%p), NetEvent (%d)\n", pNetFlt, pNetPnPEvent->NetEvent));
+            return NDIS_STATUS_SUCCESS;
+    }
+
+}
+
+#ifdef __cplusplus
+# define PTCHARS_40(_p) ((_p).Ndis40Chars)
+#else
+# define PTCHARS_40(_p) (_p)
+#endif
+
+/**
+ * register the protocol edge
+ */
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinPtRegister(PVBOXNETFLTGLOBALS_PT pGlobalsPt, PDRIVER_OBJECT pDriverObject,
+                                                PUNICODE_STRING pRegistryPathStr)
+{
+    RT_NOREF2(pDriverObject, pRegistryPathStr);
+    NDIS_PROTOCOL_CHARACTERISTICS PtChars;
+    NDIS_STRING NameStr;
+
+    NdisInitUnicodeString(&NameStr, VBOXNETFLT_NAME_PROTOCOL);
+
+    NdisZeroMemory(&PtChars, sizeof (PtChars));
+    PTCHARS_40(PtChars).MajorNdisVersion = VBOXNETFLT_VERSION_PT_NDIS_MAJOR;
+    PTCHARS_40(PtChars).MinorNdisVersion = VBOXNETFLT_VERSION_PT_NDIS_MINOR;
+
+    PTCHARS_40(PtChars).Name = NameStr;
+    PTCHARS_40(PtChars).OpenAdapterCompleteHandler = vboxNetFltWinPtOpenAdapterComplete;
+    PTCHARS_40(PtChars).CloseAdapterCompleteHandler = vboxNetFltWinPtCloseAdapterComplete;
+    PTCHARS_40(PtChars).SendCompleteHandler = vboxNetFltWinPtSendComplete;
+    PTCHARS_40(PtChars).TransferDataCompleteHandler = vboxNetFltWinPtTransferDataComplete;
+    PTCHARS_40(PtChars).ResetCompleteHandler = vboxNetFltWinPtResetComplete;
+    PTCHARS_40(PtChars).RequestCompleteHandler = vboxNetFltWinPtRequestComplete;
+    PTCHARS_40(PtChars).ReceiveHandler = vboxNetFltWinPtReceive;
+    PTCHARS_40(PtChars).ReceiveCompleteHandler = vboxNetFltWinPtReceiveComplete;
+    PTCHARS_40(PtChars).StatusHandler = vboxNetFltWinPtStatus;
+    PTCHARS_40(PtChars).StatusCompleteHandler = vboxNetFltWinPtStatusComplete;
+    PTCHARS_40(PtChars).BindAdapterHandler = vboxNetFltWinPtBindAdapter;
+    PTCHARS_40(PtChars).UnbindAdapterHandler = vboxNetFltWinPtUnbindAdapter;
+    PTCHARS_40(PtChars).UnloadHandler = vboxNetFltWinPtUnloadProtocol;
+#if !defined(DEBUG_NETFLT_RECV)
+    PTCHARS_40(PtChars).ReceivePacketHandler = vboxNetFltWinPtReceivePacket;
+#endif
+    PTCHARS_40(PtChars).PnPEventHandler = vboxNetFltWinPtPnPEvent;
+
+    NDIS_STATUS Status;
+    NdisRegisterProtocol(&Status, &pGlobalsPt->hProtocol, &PtChars, sizeof (PtChars));
+    Assert(Status == STATUS_SUCCESS);
+    return Status;
+}
+
+/**
+ * deregister the protocol edge
+ */
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinPtDeregister(PVBOXNETFLTGLOBALS_PT pGlobalsPt)
+{
+    if (!pGlobalsPt->hProtocol)
+        return NDIS_STATUS_SUCCESS;
+
+    NDIS_STATUS Status;
+
+    NdisDeregisterProtocol(&Status, pGlobalsPt->hProtocol);
+    Assert (Status == NDIS_STATUS_SUCCESS);
+    if (Status == NDIS_STATUS_SUCCESS)
+    {
+        NdisZeroMemory(pGlobalsPt, sizeof (*pGlobalsPt));
+    }
+    return Status;
+}
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFltP-win.h b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFltP-win.h
new file mode 100644
index 00000000..f2909353
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFltP-win.h
@@ -0,0 +1,42 @@
+/* $Id: VBoxNetFltP-win.h $ */
+/** @file
+ * VBoxNetFltP-win.h - Bridged Networking Driver, Windows Specific Code.
+ * Protocol edge API
+ */
+/*
+ * Copyright (C) 2011-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#ifndef VBOX_INCLUDED_SRC_VBoxNetFlt_win_drv_VBoxNetFltP_win_h
+#define VBOX_INCLUDED_SRC_VBoxNetFlt_win_drv_VBoxNetFltP_win_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#ifdef VBOXNETADP
+# error "No protocol edge"
+#endif
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinPtRegister(PVBOXNETFLTGLOBALS_PT pGlobalsPt, PDRIVER_OBJECT pDriverObject, PUNICODE_STRING pRegistryPathStr);
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinPtDeregister(PVBOXNETFLTGLOBALS_PT pGlobalsPt);
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinPtDoUnbinding(PVBOXNETFLTINS pNetFlt, bool bOnUnbind);
+DECLHIDDEN(VOID) vboxNetFltWinPtRequestComplete(NDIS_HANDLE hContext, PNDIS_REQUEST pNdisRequest, NDIS_STATUS Status);
+DECLHIDDEN(bool) vboxNetFltWinPtCloseInterface(PVBOXNETFLTINS pNetFlt, PNDIS_STATUS pStatus);
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinPtDoBinding(PVBOXNETFLTINS pThis, PNDIS_STRING pOurDeviceName, PNDIS_STRING pBindToDeviceName);
+#endif /* !VBOX_INCLUDED_SRC_VBoxNetFlt_win_drv_VBoxNetFltP_win_h */
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFltRt-win.cpp b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFltRt-win.cpp
new file mode 100644
index 00000000..f0017e48
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFltRt-win.cpp
@@ -0,0 +1,3640 @@
+/* $Id: VBoxNetFltRt-win.cpp $ */
+/** @file
+ * VBoxNetFltRt-win.cpp - Bridged Networking Driver, Windows Specific Runtime Code.
+ */
+
+/*
+ * Copyright (C) 2011-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "VBoxNetFltCmn-win.h"
+#include <VBox/intnetinline.h>
+#include <iprt/thread.h>
+
+#include <iprt/nt/tdikrnl.h>
+#include <mstcpip.h>
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/** represents the job element of the job queue
+ * see comments for VBOXNETFLT_JOB_QUEUE */
+typedef struct VBOXNETFLT_JOB
+{
+    /** link in the job queue */
+    LIST_ENTRY ListEntry;
+    /** job function to be executed */
+    PFNVBOXNETFLT_JOB_ROUTINE pfnRoutine;
+    /** parameter to be passed to the job function */
+    PVOID pContext;
+    /** event that will be fired on job completion */
+    KEVENT CompletionEvent;
+    /** true if the job manager should use the completion even for completion indication, false-otherwise*/
+    bool bUseCompletionEvent;
+} VBOXNETFLT_JOB, *PVBOXNETFLT_JOB;
+
+/**
+ * represents the queue of jobs processed by the worker thread
+ *
+ * we use the thread to process tasks which are required to be done at passive level
+ * our callbacks may be called at APC level by IntNet, there are some tasks that we can not create at APC,
+ * e.g. thread creation. This is why we schedule such jobs to the worker thread working at passive level
+ */
+typedef struct VBOXNETFLT_JOB_QUEUE
+{
+    /* jobs */
+    LIST_ENTRY Jobs;
+    /* we are using ExInterlocked..List functions to access the jobs list */
+    KSPIN_LOCK Lock;
+    /** this event is used to initiate a job worker thread kill */
+    KEVENT KillEvent;
+    /** this event is used to notify a worker thread that jobs are added to the queue */
+    KEVENT NotifyEvent;
+    /** worker thread */
+    PKTHREAD pThread;
+} VBOXNETFLT_JOB_QUEUE, *PVBOXNETFLT_JOB_QUEUE;
+
+typedef struct _CREATE_INSTANCE_CONTEXT
+{
+#ifndef VBOXNETADP
+    PNDIS_STRING pOurName;
+    PNDIS_STRING pBindToName;
+#else
+    NDIS_HANDLE hMiniportAdapter;
+    NDIS_HANDLE hWrapperConfigurationContext;
+#endif
+    NDIS_STATUS Status;
+} CREATE_INSTANCE_CONTEXT, *PCREATE_INSTANCE_CONTEXT;
+
+/*contexts used for our jobs */
+/* Attach context */
+typedef struct _ATTACH_INFO
+{
+    PVBOXNETFLTINS pNetFltIf;
+    PCREATE_INSTANCE_CONTEXT pCreateContext;
+    bool fRediscovery;
+    int Status;
+} ATTACH_INFO, *PATTACH_INFO;
+
+/* general worker context */
+typedef struct _WORKER_INFO
+{
+    PVBOXNETFLTINS pNetFltIf;
+    int Status;
+} WORKER_INFO, *PWORKER_INFO;
+
+/* idc initialization */
+typedef struct _INIT_IDC_INFO
+{
+    VBOXNETFLT_JOB Job;
+    bool bInitialized;
+    volatile bool bStop;
+    volatile int rc;
+    KEVENT hCompletionEvent;
+} INIT_IDC_INFO, *PINIT_IDC_INFO;
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+/** global job queue. some operations are required to be done at passive level, e.g. thread creation, adapter bind/unbind initiation,
+ * while IntNet typically calls us APC_LEVEL, so we just create a system thread in our DriverEntry and enqueue the jobs to that thread */
+static VBOXNETFLT_JOB_QUEUE g_VBoxJobQueue;
+volatile static bool g_bVBoxIdcInitialized;
+INIT_IDC_INFO g_VBoxInitIdcInfo;
+
+/**
+ * The (common) global data.
+ */
+static VBOXNETFLTGLOBALS g_VBoxNetFltGlobals;
+/* win-specific global data */
+VBOXNETFLTGLOBALS_WIN g_VBoxNetFltGlobalsWin = {0};
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+#define LIST_ENTRY_2_JOB(pListEntry) \
+    ( (PVBOXNETFLT_JOB)((uint8_t *)(pListEntry) - RT_UOFFSETOF(VBOXNETFLT_JOB, ListEntry)) )
+
+
+/*********************************************************************************************************************************
+*   Internal Functions                                                                                                           *
+*********************************************************************************************************************************/
+static int vboxNetFltWinAttachToInterface(PVBOXNETFLTINS pThis, void * pContext, bool fRediscovery);
+static int vboxNetFltWinConnectIt(PVBOXNETFLTINS pThis);
+static int vboxNetFltWinFiniIdc();
+static void vboxNetFltWinFiniNetFltBase();
+static int vboxNetFltWinInitNetFltBase();
+static int vboxNetFltWinFiniNetFlt();
+static int vboxNetFltWinStartInitIdcProbing();
+static int vboxNetFltWinStopInitIdcProbing();
+
+
+
+/** makes the current thread to sleep for the given number of miliseconds */
+DECLHIDDEN(void) vboxNetFltWinSleep(ULONG milis)
+{
+    RTThreadSleep(milis);
+}
+
+/** wait for the given device to be dereferenced */
+DECLHIDDEN(void) vboxNetFltWinWaitDereference(PVBOXNETFLT_WINIF_DEVICE pState)
+{
+#ifdef DEBUG
+    uint64_t StartNanoTS = RTTimeSystemNanoTS();
+    uint64_t CurNanoTS;
+#endif
+    Assert(KeGetCurrentIrql() < DISPATCH_LEVEL);
+
+    while (ASMAtomicUoReadU32((volatile uint32_t *)&pState->cReferences))
+    {
+        vboxNetFltWinSleep(2);
+#ifdef DEBUG
+        CurNanoTS = RTTimeSystemNanoTS();
+        if (CurNanoTS - StartNanoTS > 20000000)
+        {
+            LogRel(("device not idle"));
+            AssertFailed();
+//            break;
+        }
+#endif
+    }
+}
+
+/**
+ * mem functions
+ */
+/* allocates and zeroes the nonpaged memory of a given size */
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinMemAlloc(PVOID *ppvMemBuf, UINT cbLength)
+{
+#ifdef DEBUG_NETFLT_USE_EXALLOC
+    *ppvMemBuf = ExAllocatePoolWithTag(NonPagedPool, cbLength, VBOXNETFLT_MEM_TAG);
+    if (*ppvMemBuf)
+    {
+        NdisZeroMemory(*ppvMemBuf, cbLength);
+        return NDIS_STATUS_SUCCESS;
+    }
+    return NDIS_STATUS_FAILURE;
+#else
+    NDIS_STATUS fStatus = NdisAllocateMemoryWithTag(ppvMemBuf, cbLength, VBOXNETFLT_MEM_TAG);
+    if (fStatus == NDIS_STATUS_SUCCESS)
+        NdisZeroMemory(*ppvMemBuf, cbLength);
+    return fStatus;
+#endif
+}
+
+/* frees memory allocated with vboxNetFltWinMemAlloc */
+DECLHIDDEN(void) vboxNetFltWinMemFree(PVOID pvMemBuf)
+{
+#ifdef DEBUG_NETFLT_USE_EXALLOC
+    ExFreePool(pvMemBuf);
+#else
+    NdisFreeMemory(pvMemBuf, 0, 0);
+#endif
+}
+
+#ifndef VBOXNETFLT_NO_PACKET_QUEUE
+
+/* initializes packet info pool and allocates the cSize packet infos for the pool */
+static NDIS_STATUS vboxNetFltWinPpAllocatePacketInfoPool(PVBOXNETFLT_PACKET_INFO_POOL pPool, UINT cSize)
+{
+    UINT cbBufSize = sizeof(PACKET_INFO)*cSize;
+    PACKET_INFO * pPacketInfos;
+    NDIS_STATUS fStatus;
+    UINT i;
+
+    Assert(cSize > 0);
+
+    INIT_INTERLOCKED_PACKET_QUEUE(&pPool->Queue);
+
+    fStatus = vboxNetFltWinMemAlloc((PVOID*)&pPacketInfos, cbBufSize);
+
+    if (fStatus == NDIS_STATUS_SUCCESS)
+    {
+        PVBOXNETFLTPACKET_INFO pInfo;
+        pPool->pBuffer = pPacketInfos;
+
+        for (i = 0; i < cSize; i++)
+        {
+            pInfo = &pPacketInfos[i];
+            vboxNetFltWinQuEnqueueTail(&pPool->Queue.Queue, pInfo);
+            pInfo->pPool = pPool;
+        }
+    }
+    else
+    {
+        AssertFailed();
+    }
+
+    return fStatus;
+}
+
+/* frees the packet info pool */
+VOID vboxNetFltWinPpFreePacketInfoPool(PVBOXNETFLT_PACKET_INFO_POOL pPool)
+{
+    vboxNetFltWinMemFree(pPool->pBuffer);
+
+    FINI_INTERLOCKED_PACKET_QUEUE(&pPool->Queue)
+}
+
+#endif
+
+/**
+ * copies one string to another. in case the destination string size is not enough to hold the complete source string
+ * does nothing and returns NDIS_STATUS_RESOURCES .
+ */
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinCopyString(PNDIS_STRING pDst, PNDIS_STRING pSrc)
+{
+    NDIS_STATUS Status = NDIS_STATUS_SUCCESS;
+
+    if (pDst != pSrc)
+    {
+        if (pDst->MaximumLength < pSrc->Length)
+        {
+            AssertFailed();
+            Status = NDIS_STATUS_RESOURCES;
+        }
+        else
+        {
+            pDst->Length = pSrc->Length;
+
+            if (pDst->Buffer != pSrc->Buffer)
+            {
+                NdisMoveMemory(pDst->Buffer, pSrc->Buffer, pSrc->Length);
+            }
+        }
+    }
+    return Status;
+}
+
+/************************************************************************************
+ * PINTNETSG pSG manipulation functions
+ ************************************************************************************/
+
+/* moves the contents of the given NDIS_BUFFER and all other buffers chained to it to the PINTNETSG
+ * the PINTNETSG is expected to contain one segment whose bugger is large enough to maintain
+ * the contents of the given NDIS_BUFFER and all other buffers chained to it */
+static NDIS_STATUS vboxNetFltWinNdisBufferMoveToSG0(PNDIS_BUFFER pBuffer, PINTNETSG pSG)
+{
+    PINTNETSEG paSeg;
+    uint8_t * ptr;
+    PVOID pVirtualAddress;
+    UINT cbCurrentLength;
+    NDIS_STATUS fStatus = NDIS_STATUS_SUCCESS;
+
+    Assert(pSG->cSegsAlloc == 1);
+
+    paSeg = pSG->aSegs;
+    ptr = (uint8_t*)paSeg->pv;
+    paSeg->cb = 0;
+    paSeg->Phys = NIL_RTHCPHYS;
+    pSG->cbTotal = 0;
+
+    Assert(paSeg->pv);
+
+    while (pBuffer)
+    {
+        NdisQueryBufferSafe(pBuffer, &pVirtualAddress, &cbCurrentLength, NormalPagePriority);
+
+        if (!pVirtualAddress)
+        {
+            fStatus = NDIS_STATUS_FAILURE;
+            break;
+        }
+
+        pSG->cbTotal += cbCurrentLength;
+        paSeg->cb += cbCurrentLength;
+        NdisMoveMemory(ptr, pVirtualAddress, cbCurrentLength);
+        ptr += cbCurrentLength;
+
+        NdisGetNextBuffer(pBuffer, &pBuffer);
+    }
+
+    if (fStatus == NDIS_STATUS_SUCCESS)
+    {
+        pSG->cSegsUsed = 1;
+        Assert(pSG->cbTotal == paSeg->cb);
+    }
+    return fStatus;
+}
+
+/* converts the PNDIS_BUFFER to PINTNETSG by making the PINTNETSG segments to point to the memory buffers the
+ * ndis buffer(s) point to (as opposed to vboxNetFltWinNdisBufferMoveToSG0 which copies the memory from ndis buffers(s) to PINTNETSG) */
+static NDIS_STATUS vboxNetFltWinNdisBuffersToSG(PNDIS_BUFFER pBuffer, PINTNETSG pSG)
+{
+    UINT cSegs = 0;
+    NDIS_STATUS Status = NDIS_STATUS_SUCCESS;
+    PVOID pVirtualAddress;
+    UINT cbCurrentLength;
+
+    while (pBuffer)
+    {
+        NdisQueryBufferSafe(pBuffer, &pVirtualAddress, &cbCurrentLength, NormalPagePriority);
+
+        if (!pVirtualAddress)
+        {
+            Status = NDIS_STATUS_FAILURE;
+            break;
+        }
+
+        pSG->cbTotal += cbCurrentLength;
+        pSG->aSegs[cSegs].cb = cbCurrentLength;
+        pSG->aSegs[cSegs].pv = pVirtualAddress;
+        pSG->aSegs[cSegs].Phys = NIL_RTHCPHYS;
+        cSegs++;
+
+        NdisGetNextBuffer(pBuffer, &pBuffer);
+    }
+
+    AssertFatal(cSegs <= pSG->cSegsAlloc);
+
+    if (Status == NDIS_STATUS_SUCCESS)
+    {
+        pSG->cSegsUsed = cSegs;
+    }
+
+    return Status;
+}
+
+static void vboxNetFltWinDeleteSG(PINTNETSG pSG)
+{
+    vboxNetFltWinMemFree(pSG);
+}
+
+static PINTNETSG vboxNetFltWinCreateSG(uint32_t cSegs)
+{
+    PINTNETSG pSG;
+    NTSTATUS Status = vboxNetFltWinMemAlloc((PVOID*)&pSG, RT_UOFFSETOF_DYN(INTNETSG, aSegs[cSegs]));
+    if (Status == STATUS_SUCCESS)
+    {
+        IntNetSgInitTempSegs(pSG, 0 /*cbTotal*/, cSegs, 0 /*cSegsUsed*/);
+        return pSG;
+    }
+
+    return NULL;
+}
+
+/************************************************************************************
+ * packet queue functions
+ ************************************************************************************/
+#ifndef VBOXNETFLT_NO_PACKET_QUEUE
+#if !defined(VBOXNETADP)
+static NDIS_STATUS vboxNetFltWinQuPostPacket(PVBOXNETFLTINS pNetFlt, PNDIS_PACKET pPacket, PINTNETSG pSG, uint32_t fFlags
+# ifdef DEBUG_NETFLT_PACKETS
+        , PNDIS_PACKET pTmpPacket
+# endif
+        )
+{
+    NDIS_STATUS Status;
+    PNDIS_PACKET pMyPacket;
+    bool bSrcHost = fFlags & PACKET_SRC_HOST;
+
+    LogFlow(("posting packet back to driver stack..\n"));
+
+    if (!pPacket)
+    {
+        /* INTNETSG was in the packet queue, create a new NdisPacket from INTNETSG*/
+        pMyPacket = vboxNetFltWinNdisPacketFromSG(pNetFlt,
+                pSG, /* PINTNETSG */
+                pSG, /* PVOID pBufToFree */
+                bSrcHost, /* bool bToWire */
+                false); /* bool bCopyMemory */
+
+        Assert(pMyPacket);
+
+        NDIS_SET_PACKET_STATUS(pMyPacket, NDIS_STATUS_SUCCESS);
+
+        DBG_CHECK_PACKET_AND_SG(pMyPacket, pSG);
+
+#ifdef DEBUG_NETFLT_PACKETS
+        Assert(pTmpPacket);
+
+        DBG_CHECK_PACKET_AND_SG(pTmpPacket, pSG);
+
+        DBG_CHECK_PACKETS(pTmpPacket, pMyPacket);
+#endif
+
+        LogFlow(("non-ndis packet info, packet created (%p)\n", pMyPacket));
+    }
+    else
+    {
+        /* NDIS_PACKET was in the packet queue */
+        DBG_CHECK_PACKET_AND_SG(pPacket, pSG);
+
+        if (!(fFlags & PACKET_MINE))
+        {
+            /* the packet is the one that was passed to us in send/receive callback
+             * According to the DDK, we can not post it further,
+             * instead we should allocate our own packet.
+             * So, allocate our own packet (pMyPacket) and copy the packet info there */
+            if (bSrcHost)
+            {
+                Status = vboxNetFltWinPrepareSendPacket(pNetFlt, pPacket, &pMyPacket/*, true*/);
+                LogFlow(("packet from wire, packet created (%p)\n", pMyPacket));
+            }
+            else
+            {
+                Status = vboxNetFltWinPrepareRecvPacket(pNetFlt, pPacket, &pMyPacket, false);
+                LogFlow(("packet from wire, packet created (%p)\n", pMyPacket));
+            }
+        }
+        else
+        {
+            /* the packet enqueued is ours, simply assign pMyPacket and zero pPacket */
+            pMyPacket = pPacket;
+            pPacket = NULL;
+        }
+        Assert(pMyPacket);
+    }
+
+    if (pMyPacket)
+    {
+        /* we have successfully initialized our packet, post it to the host or to the wire */
+        if (bSrcHost)
+        {
+#if defined(DEBUG_NETFLT_PACKETS) || !defined(VBOX_LOOPBACK_USEFLAGS)
+            vboxNetFltWinLbPutSendPacket(pNetFlt, pMyPacket, false /* bFromIntNet */);
+#endif
+            NdisSend(&Status, pNetFlt->u.s.hBinding, pMyPacket);
+
+            if (Status != NDIS_STATUS_PENDING)
+            {
+#if defined(DEBUG_NETFLT_PACKETS) || !defined(VBOX_LOOPBACK_USEFLAGS)
+                /* the status is NOT pending, complete the packet */
+                bool bTmp = vboxNetFltWinLbRemoveSendPacket(pNetFlt, pMyPacket);
+                Assert(bTmp);
+#endif
+                if (pPacket)
+                {
+                    LogFlow(("status is not pending, completing packet (%p)\n", pPacket));
+
+                    NdisIMCopySendCompletePerPacketInfo (pPacket, pMyPacket);
+
+                    NdisFreePacket(pMyPacket);
+                }
+                else
+                {
+                    /* should never be here since the PINTNETSG is stored only when the underlying miniport
+                     * indicates NDIS_STATUS_RESOURCES, we should never have this when processing
+                     * the "from-host" packets */
+                    AssertFailed();
+                    LogFlow(("status is not pending, freeing myPacket (%p)\n", pMyPacket));
+                    vboxNetFltWinFreeSGNdisPacket(pMyPacket, false);
+                }
+            }
+        }
+        else
+        {
+            NdisMIndicateReceivePacket(pNetFlt->u.s.hMiniport, &pMyPacket, 1);
+
+            Status = NDIS_STATUS_PENDING;
+            /* the packet receive completion is always indicated via MiniportReturnPacket */
+        }
+    }
+    else
+    {
+        /*we failed to create our packet */
+        AssertFailed();
+        Status = NDIS_STATUS_FAILURE;
+    }
+
+    return Status;
+}
+#endif
+
+static bool vboxNetFltWinQuProcessInfo(PVBOXNETFLTINS pNetFltIf, PPACKET_QUEUE_WORKER pWorker, PVOID pvPacket, const UINT fFlags)
+#else
+DECLHIDDEN(bool) vboxNetFltWinPostIntnet(PVBOXNETFLTINS pNetFltIf, PVOID pvPacket, const UINT fFlags)
+#endif
+{
+    PNDIS_PACKET pPacket = NULL;
+    PINTNETSG pSG = NULL;
+    NDIS_STATUS Status;
+#ifndef VBOXNETADP
+    bool bSrcHost;
+    bool bDropIt;
+# ifndef VBOXNETFLT_NO_PACKET_QUEUE
+    bool bPending;
+# endif
+#endif
+#ifdef VBOXNETFLT_NO_PACKET_QUEUE
+    bool bDeleteSG = false;
+#endif
+#ifdef DEBUG_NETFLT_PACKETS
+    /* packet used for matching */
+    PNDIS_PACKET pTmpPacket = NULL;
+#endif
+
+#ifndef VBOXNETADP
+    bSrcHost = (fFlags & VBOXNETFLT_PACKET_SRC_HOST) != 0;
+#endif
+
+    /* we first need to obtain the INTNETSG to be passed to intnet */
+
+    /* the queue may contain two "types" of packets:
+     * the NDIS_PACKET and the INTNETSG.
+     * I.e. on send/receive we typically enqueue the NDIS_PACKET passed to us by ndis,
+     * however in case our ProtocolReceive is called or the packet's status is set to NDIS_STSTUS_RESOURCES
+     * in ProtocolReceivePacket, we must return the packet immediately on ProtocolReceive*** exit
+     * In this case we allocate the INTNETSG, copy the ndis packet data there and enqueue it.
+     * In this case the packet info flags has the VBOXNETFLT_PACKET_SG fag set
+     *
+     * Besides that the NDIS_PACKET contained in the queue could be either the one passed to us in our send/receive callback
+     * or the one created by us. The latter is possible in case our ProtocolReceive callback is called and we call NdisTransferData
+     * in this case we need to allocate the packet the data to be transferred to.
+     * If the enqueued packet is the one allocated by us the VBOXNETFLT_PACKET_MINE flag is set
+     * */
+    if ((fFlags & VBOXNETFLT_PACKET_SG) == 0)
+    {
+        /* we have NDIS_PACKET enqueued, we need to convert it to INTNETSG to be passed to intnet */
+        PNDIS_BUFFER pCurrentBuffer = NULL;
+        UINT cBufferCount;
+        UINT cbPacketLength;
+
+        pPacket = (PNDIS_PACKET)pvPacket;
+
+        LogFlow(("ndis packet info, packet (%p)\n", pPacket));
+
+        LogFlow(("preparing pSG"));
+        NdisQueryPacket(pPacket, NULL, &cBufferCount, &pCurrentBuffer, &cbPacketLength);
+        Assert(cBufferCount);
+
+#ifdef VBOXNETFLT_NO_PACKET_QUEUE
+        pSG = vboxNetFltWinCreateSG(cBufferCount);
+#else
+        /* we can not allocate the INTNETSG on stack since in this case we may get stack overflow
+         * somewhere outside of our driver (3 pages of system thread stack does not seem to be enough)
+         *
+         * since we have a "serialized" packet processing, i.e. all packets are being processed and passed
+         * to intnet by this thread, we just use one previously allocated INTNETSG which is stored in PVBOXNETFLTINS */
+        pSG = pWorker->pSG;
+
+        if (cBufferCount > pSG->cSegsAlloc)
+        {
+            pSG = vboxNetFltWinCreateSG(cBufferCount + 2);
+            if (pSG)
+            {
+                vboxNetFltWinDeleteSG(pWorker->pSG);
+                pWorker->pSG = pSG;
+            }
+            else
+            {
+                LogRel(("Failed to reallocate the pSG\n"));
+            }
+        }
+#endif
+
+        if (pSG)
+        {
+#ifdef VBOXNETFLT_NO_PACKET_QUEUE
+            bDeleteSG = true;
+#endif
+            /* reinitialize */
+            IntNetSgInitTempSegs(pSG, 0 /*cbTotal*/, pSG->cSegsAlloc, 0 /*cSegsUsed*/);
+
+            /* convert the ndis buffers to INTNETSG */
+            Status = vboxNetFltWinNdisBuffersToSG(pCurrentBuffer, pSG);
+            if (Status != NDIS_STATUS_SUCCESS)
+            {
+                pSG = NULL;
+            }
+            else
+            {
+                DBG_CHECK_PACKET_AND_SG(pPacket, pSG);
+            }
+        }
+    }
+    else
+    {
+        /* we have the INTNETSG enqueued. (see the above comment explaining why/when this may happen)
+         * just use the INTNETSG to pass it to intnet */
+#ifndef VBOXNETADP
+        /* the PINTNETSG is stored only when the underlying miniport
+         * indicates NDIS_STATUS_RESOURCES, we should never have this when processing
+         * the "from-host" packedts */
+        Assert(!bSrcHost);
+#endif
+        pSG = (PINTNETSG)pvPacket;
+
+        LogFlow(("not ndis packet info, pSG (%p)\n", pSG));
+    }
+
+#ifdef DEBUG_NETFLT_PACKETS
+    if (!pPacket && !pTmpPacket)
+    {
+        /* create tmp packet that woud be used for matching */
+        pTmpPacket = vboxNetFltWinNdisPacketFromSG(pNetFltIf,
+                    pSG, /* PINTNETSG */
+                    pSG, /* PVOID pBufToFree */
+                    bSrcHost, /* bool bToWire */
+                    true); /* bool bCopyMemory */
+
+        NDIS_SET_PACKET_STATUS(pTmpPacket, NDIS_STATUS_SUCCESS);
+
+        DBG_CHECK_PACKET_AND_SG(pTmpPacket, pSG);
+
+        Assert(pTmpPacket);
+    }
+#endif
+    do
+    {
+#ifndef VBOXNETADP
+        /* the pSG was successfully initialized, post it to the netFlt*/
+        bDropIt = pSG ? pNetFltIf->pSwitchPort->pfnRecv(pNetFltIf->pSwitchPort, NULL /* pvIf */, pSG,
+                    bSrcHost ? INTNETTRUNKDIR_HOST : INTNETTRUNKDIR_WIRE
+                            )
+              : false;
+#else
+        if (pSG)
+        {
+            pNetFltIf->pSwitchPort->pfnRecv(pNetFltIf->pSwitchPort, NULL /* pvIf */, pSG, INTNETTRUNKDIR_HOST);
+            STATISTIC_INCREASE(pNetFltIf->u.s.WinIf.cTxSuccess);
+        }
+        else
+        {
+            STATISTIC_INCREASE(pNetFltIf->u.s.WinIf.cTxError);
+        }
+#endif
+
+#ifndef VBOXNETFLT_NO_PACKET_QUEUE
+
+# if !defined(VBOXNETADP)
+        if (!bDropIt)
+        {
+            Status = vboxNetFltWinQuPostPacket(pNetFltIf, pPacket, pSG, fFlags
+#  ifdef DEBUG_NETFLT_PACKETS
+                               , pTmpPacket
+#  endif
+            );
+
+            if (Status == NDIS_STATUS_PENDING)
+            {
+                /* we will process packet completion in the completion routine */
+                bPending = true;
+                break;
+            }
+        }
+        else
+# endif
+        {
+            Status = NDIS_STATUS_SUCCESS;
+        }
+
+        /* drop it */
+        if (pPacket)
+        {
+            if (!(fFlags & PACKET_MINE))
+            {
+# if !defined(VBOXNETADP)
+                /* complete the packets */
+                if (fFlags & PACKET_SRC_HOST)
+                {
+# endif
+/*                    NDIS_SET_PACKET_STATUS(pPacket, Status); */
+                    NdisMSendComplete(pNetFltIf->u.s.hMiniport, pPacket, Status);
+# if !defined(VBOXNETADP)
+                }
+                else
+                {
+# endif
+# ifndef VBOXNETADP
+                    NdisReturnPackets(&pPacket, 1);
+# endif
+# if !defined(VBOXNETADP)
+                }
+# endif
+            }
+            else
+            {
+                Assert(!(fFlags & PACKET_SRC_HOST));
+                vboxNetFltWinFreeSGNdisPacket(pPacket, true);
+            }
+        }
+        else
+        {
+            Assert(pSG);
+            vboxNetFltWinMemFree(pSG);
+        }
+# ifndef VBOXNETADP
+        bPending = false;
+# endif
+    } while (0);
+
+#ifdef DEBUG_NETFLT_PACKETS
+    if (pTmpPacket)
+    {
+        vboxNetFltWinFreeSGNdisPacket(pTmpPacket, true);
+    }
+#endif
+
+#ifndef VBOXNETADP
+    return bPending;
+#else
+    return false;
+#endif
+#else /* #ifdef VBOXNETFLT_NO_PACKET_QUEUE */
+    } while (0);
+
+    if (bDeleteSG)
+        vboxNetFltWinMemFree(pSG);
+
+# ifndef VBOXNETADP
+    return bDropIt;
+# else
+    return true;
+# endif
+#endif
+}
+#ifndef VBOXNETFLT_NO_PACKET_QUEUE
+/*
+ * thread start function for the thread which processes the packets enqueued in our send and receive callbacks called by ndis
+ *
+ * ndis calls us at DISPATCH_LEVEL, while IntNet is using kernel functions which require Irql<DISPATCH_LEVEL
+ * this is why we can not immediately post packets to IntNet from our sen/receive callbacks
+ * instead we put the incoming packets to the queue and maintain the system thread running at passive level
+ * which processes the queue and posts the packets to IntNet, and further to the host or to the wire.
+ */
+static VOID vboxNetFltWinQuPacketQueueWorkerThreadProc(PVBOXNETFLTINS pNetFltIf)
+{
+    bool fResume = true;
+    NTSTATUS fStatus;
+    PPACKET_QUEUE_WORKER pWorker = &pNetFltIf->u.s.PacketQueueWorker;
+
+    PVOID apEvents[] = {
+        (PVOID)&pWorker->KillEvent,
+        (PVOID)&pWorker->NotifyEvent
+    };
+
+    while (fResume)
+    {
+        uint32_t cNumProcessed;
+        uint32_t cNumPostedToHostWire;
+
+        fStatus = KeWaitForMultipleObjects(RT_ELEMENTS(apEvents), apEvents, WaitAny, Executive, KernelMode, FALSE, NULL, NULL);
+        if (!NT_SUCCESS(fStatus) || fStatus == STATUS_WAIT_0)
+        {
+            /* "kill" event was set
+             * will process queued packets and exit */
+            fResume = false;
+        }
+
+        LogFlow(("processing vboxNetFltWinQuPacketQueueWorkerThreadProc\n"));
+
+        cNumProcessed = 0;
+        cNumPostedToHostWire = 0;
+
+        do
+        {
+            PVBOXNETFLTPACKET_INFO pInfo;
+
+#ifdef DEBUG_NETFLT_PACKETS
+            /* packet used for matching */
+            PNDIS_PACKET pTmpPacket = NULL;
+#endif
+
+            /** @todo FIXME: !!! the better approach for performance would be to dequeue all packets at once
+             * and then go through all dequeued packets
+             * the same should be done for enqueue !!! */
+            pInfo = vboxNetFltWinQuInterlockedDequeueHead(&pWorker->PacketQueue);
+
+            if (!pInfo)
+            {
+                break;
+            }
+
+            LogFlow(("found info (0x%p)\n", pInfo));
+
+            if (vboxNetFltWinQuProcessInfo(pNetFltIf, pWorker, pInfo->pPacket, pInfo->fFlags))
+            {
+                cNumPostedToHostWire++;
+            }
+
+            vboxNetFltWinPpFreePacketInfo(pInfo);
+
+            cNumProcessed++;
+        } while (TRUE);
+
+        if (cNumProcessed)
+        {
+            vboxNetFltWinDecReferenceNetFlt(pNetFltIf, cNumProcessed);
+
+            Assert(cNumProcessed >= cNumPostedToHostWire);
+
+            if (cNumProcessed != cNumPostedToHostWire)
+            {
+                vboxNetFltWinDecReferenceWinIf(pNetFltIf, cNumProcessed - cNumPostedToHostWire);
+            }
+        }
+    }
+
+    PsTerminateSystemThread(STATUS_SUCCESS);
+}
+#endif
+/**
+ * thread start function for the job processing thread
+ *
+ * see comments for PVBOXNETFLT_JOB_QUEUE
+ */
+static VOID vboxNetFltWinJobWorkerThreadProc(PVBOXNETFLT_JOB_QUEUE pQueue)
+{
+    bool fResume = true;
+    NTSTATUS Status;
+
+    PVOID apEvents[] = {
+        (PVOID)&pQueue->KillEvent,
+        (PVOID)&pQueue->NotifyEvent,
+    };
+
+    do
+    {
+        Status = KeWaitForMultipleObjects(RT_ELEMENTS(apEvents), apEvents, WaitAny, Executive, KernelMode, FALSE, NULL, NULL);
+        Assert(NT_SUCCESS(Status));
+        if (!NT_SUCCESS(Status) || Status == STATUS_WAIT_0)
+        {
+            /* will process queued jobs and exit */
+            Assert(Status == STATUS_WAIT_0);
+            fResume = false;
+        }
+
+        do
+        {
+            PLIST_ENTRY pJobEntry = ExInterlockedRemoveHeadList(&pQueue->Jobs, &pQueue->Lock);
+            PVBOXNETFLT_JOB pJob;
+
+            if (!pJobEntry)
+                break;
+
+            pJob = LIST_ENTRY_2_JOB(pJobEntry);
+
+            Assert(KeGetCurrentIrql() == PASSIVE_LEVEL);
+            pJob->pfnRoutine(pJob->pContext);
+            Assert(KeGetCurrentIrql() == PASSIVE_LEVEL);
+
+            if (pJob->bUseCompletionEvent)
+            {
+                KeSetEvent(&pJob->CompletionEvent, 1, FALSE);
+            }
+        } while (TRUE);
+    } while (fResume);
+
+    Assert(Status == STATUS_WAIT_0);
+
+    PsTerminateSystemThread(STATUS_SUCCESS);
+}
+
+/**
+ * enqueues the job to the job queue to be processed by the job worker thread
+ * see comments for PVBOXNETFLT_JOB_QUEUE
+ */
+static VOID vboxNetFltWinJobEnqueueJob(PVBOXNETFLT_JOB_QUEUE pQueue, PVBOXNETFLT_JOB pJob, bool bEnqueueHead)
+{
+    if (bEnqueueHead)
+    {
+        ExInterlockedInsertHeadList(&pQueue->Jobs, &pJob->ListEntry, &pQueue->Lock);
+    }
+    else
+    {
+        ExInterlockedInsertTailList(&pQueue->Jobs, &pJob->ListEntry, &pQueue->Lock);
+    }
+
+    KeSetEvent(&pQueue->NotifyEvent, 1, FALSE);
+}
+
+DECLINLINE(VOID) vboxNetFltWinJobInit(PVBOXNETFLT_JOB pJob, PFNVBOXNETFLT_JOB_ROUTINE pfnRoutine, PVOID pContext, bool bUseEvent)
+{
+    pJob->pfnRoutine = pfnRoutine;
+    pJob->pContext = pContext;
+    pJob->bUseCompletionEvent = bUseEvent;
+    if (bUseEvent)
+        KeInitializeEvent(&pJob->CompletionEvent, NotificationEvent, FALSE);
+}
+
+/**
+ * enqueues the job to the job queue to be processed by the job worker thread and
+ * blocks until the job is done
+ * see comments for PVBOXNETFLT_JOB_QUEUE
+ */
+static VOID vboxNetFltWinJobSynchExec(PVBOXNETFLT_JOB_QUEUE pQueue, PFNVBOXNETFLT_JOB_ROUTINE pfnRoutine, PVOID pContext)
+{
+    VBOXNETFLT_JOB Job;
+
+    Assert(KeGetCurrentIrql() < DISPATCH_LEVEL);
+
+    vboxNetFltWinJobInit(&Job, pfnRoutine, pContext, true);
+
+    vboxNetFltWinJobEnqueueJob(pQueue, &Job, false);
+
+    KeWaitForSingleObject(&Job.CompletionEvent, Executive, KernelMode, FALSE, NULL);
+}
+
+/**
+ * enqueues the job to be processed by the job worker thread at passive level and
+ * blocks until the job is done
+ */
+DECLHIDDEN(VOID) vboxNetFltWinJobSynchExecAtPassive(PFNVBOXNETFLT_JOB_ROUTINE pfnRoutine, PVOID pContext)
+{
+    vboxNetFltWinJobSynchExec(&g_VBoxJobQueue, pfnRoutine, pContext);
+}
+
+/**
+ * helper function used for system thread creation
+ */
+static NTSTATUS vboxNetFltWinQuCreateSystemThread(PKTHREAD *ppThread, PKSTART_ROUTINE pfnStartRoutine, PVOID pvStartContext)
+{
+    OBJECT_ATTRIBUTES ObjectAttributes;
+    Assert(KeGetCurrentIrql() == PASSIVE_LEVEL);
+
+    InitializeObjectAttributes(&ObjectAttributes, NULL, OBJ_KERNEL_HANDLE, NULL, NULL);
+
+    HANDLE hThread;
+    NTSTATUS Status = PsCreateSystemThread(&hThread, THREAD_ALL_ACCESS, &ObjectAttributes, NULL, NULL, (PKSTART_ROUTINE)pfnStartRoutine, pvStartContext);
+    Assert(Status == STATUS_SUCCESS);
+    if (Status == STATUS_SUCCESS)
+    {
+        Status = ObReferenceObjectByHandle(hThread, THREAD_ALL_ACCESS, NULL, KernelMode, (PVOID*)ppThread, NULL);
+        Assert(Status == STATUS_SUCCESS);
+        ZwClose(hThread);
+        if (Status == STATUS_SUCCESS)
+        {
+            return STATUS_SUCCESS;
+        }
+
+        /** @todo how would we fail in this case ?*/
+    }
+    return Status;
+}
+
+/**
+ * initialize the job queue
+ * see comments for PVBOXNETFLT_JOB_QUEUE
+ */
+static NTSTATUS vboxNetFltWinJobInitQueue(PVBOXNETFLT_JOB_QUEUE pQueue)
+{
+    NTSTATUS fStatus;
+
+    Assert(KeGetCurrentIrql() == PASSIVE_LEVEL);
+
+    NdisZeroMemory(pQueue, sizeof(VBOXNETFLT_JOB_QUEUE));
+
+    KeInitializeEvent(&pQueue->KillEvent, NotificationEvent, FALSE);
+
+    KeInitializeEvent(&pQueue->NotifyEvent, SynchronizationEvent, FALSE);
+
+    InitializeListHead(&pQueue->Jobs);
+
+    fStatus = vboxNetFltWinQuCreateSystemThread(&pQueue->pThread, (PKSTART_ROUTINE)vboxNetFltWinJobWorkerThreadProc, pQueue);
+    if (fStatus != STATUS_SUCCESS)
+    {
+        pQueue->pThread = NULL;
+    }
+    else
+    {
+        Assert(pQueue->pThread);
+    }
+
+    return fStatus;
+}
+
+/**
+ * deinitialize the job queue
+ * see comments for PVBOXNETFLT_JOB_QUEUE
+ */
+static void vboxNetFltWinJobFiniQueue(PVBOXNETFLT_JOB_QUEUE pQueue)
+{
+    Assert(KeGetCurrentIrql() == PASSIVE_LEVEL);
+
+    if (pQueue->pThread)
+    {
+        KeSetEvent(&pQueue->KillEvent, 0, FALSE);
+
+        KeWaitForSingleObject(pQueue->pThread, Executive,
+                            KernelMode, FALSE, NULL);
+    }
+}
+
+#ifndef VBOXNETFLT_NO_PACKET_QUEUE
+
+/**
+ * initializes the packet queue
+ * */
+DECLHIDDEN(NTSTATUS) vboxNetFltWinQuInitPacketQueue(PVBOXNETFLTINS pInstance)
+{
+    NTSTATUS Status;
+    PPACKET_QUEUE_WORKER pWorker = &pInstance->u.s.PacketQueueWorker;
+
+    AssertFatal(!pWorker->pSG);
+
+    Assert(KeGetCurrentIrql() == PASSIVE_LEVEL);
+
+    KeInitializeEvent(&pWorker->KillEvent, NotificationEvent, FALSE);
+
+    KeInitializeEvent(&pWorker->NotifyEvent, SynchronizationEvent, FALSE);
+
+    INIT_INTERLOCKED_PACKET_QUEUE(&pWorker->PacketQueue);
+
+    do
+    {
+    Status = vboxNetFltWinPpAllocatePacketInfoPool(&pWorker->PacketInfoPool, VBOXNETFLT_PACKET_INFO_POOL_SIZE);
+
+    if (Status == NDIS_STATUS_SUCCESS)
+    {
+        pWorker->pSG = vboxNetFltWinCreateSG(PACKET_QUEUE_SG_SEGS_ALLOC);
+        if (!pWorker->pSG)
+        {
+            Status = STATUS_INSUFFICIENT_RESOURCES;
+            break;
+        }
+
+        Status = vboxNetFltWinQuCreateSystemThread(&pWorker->pThread, (PKSTART_ROUTINE)vboxNetFltWinQuPacketQueueWorkerThreadProc, pInstance);
+        if (Status != STATUS_SUCCESS)
+        {
+            vboxNetFltWinPpFreePacketInfoPool(&pWorker->PacketInfoPool);
+            vboxNetFltWinMemFree(pWorker->pSG);
+            pWorker->pSG = NULL;
+            break;
+        }
+    }
+
+    } while (0);
+
+    return Status;
+}
+
+/*
+ * deletes the packet queue
+ */
+DECLHIDDEN(void) vboxNetFltWinQuFiniPacketQueue(PVBOXNETFLTINS pInstance)
+{
+    PINTNETSG pSG;
+    PPACKET_QUEUE_WORKER pWorker = &pInstance->u.s.PacketQueueWorker;
+    Assert(KeGetCurrentIrql() < DISPATCH_LEVEL);
+
+    /* using the pPacketQueueSG as an indicator that the packet queue is initialized */
+    RTSpinlockAcquire((pInstance)->hSpinlock);
+    if (pWorker->pSG)
+    {
+        pSG = pWorker->pSG;
+        pWorker->pSG = NULL;
+        RTSpinlockRelease((pInstance)->hSpinlock);
+        KeSetEvent(&pWorker->KillEvent, 0, FALSE);
+
+        KeWaitForSingleObject(pWorker->pThread, Executive,
+                            KernelMode, FALSE, NULL);
+
+        vboxNetFltWinPpFreePacketInfoPool(&pWorker->PacketInfoPool);
+
+        vboxNetFltWinDeleteSG(pSG);
+
+        FINI_INTERLOCKED_PACKET_QUEUE(&pWorker->PacketQueue);
+    }
+    else
+    {
+        RTSpinlockRelease((pInstance)->hSpinlock);
+    }
+}
+
+#endif
+
+/*
+ * creates the INTNETSG containing one segment pointing to the buffer of size cbBufSize
+ * the INTNETSG created should be cleaned with vboxNetFltWinMemFree
+ */
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinAllocSG(UINT cbPacket, PINTNETSG *ppSG)
+{
+    NDIS_STATUS Status;
+    PINTNETSG pSG;
+
+    /* allocation:
+     * 1. SG_PACKET - with one aSegs pointing to
+     * 2. buffer of cbPacket containing the entire packet */
+    AssertCompileSizeAlignment(INTNETSG, sizeof(PVOID));
+    Status = vboxNetFltWinMemAlloc((PVOID*)&pSG, cbPacket + sizeof(INTNETSG));
+    if (Status == NDIS_STATUS_SUCCESS)
+    {
+        IntNetSgInitTemp(pSG, pSG + 1, cbPacket);
+        LogFlow(("pSG created (%p)\n", pSG));
+        *ppSG = pSG;
+    }
+    return Status;
+}
+
+#ifndef VBOXNETFLT_NO_PACKET_QUEUE
+/**
+ * put the packet info to the queue
+ */
+DECLINLINE(void) vboxNetFltWinQuEnqueueInfo(PVBOXNETFLTPACKET_QUEUE_WORKER pWorker, PVBOXNETFLTPACKET_INFO pInfo)
+{
+    vboxNetFltWinQuInterlockedEnqueueTail(&pWorker->PacketQueue, pInfo);
+
+    KeSetEvent(&pWorker->NotifyEvent, IO_NETWORK_INCREMENT, FALSE);
+}
+
+/**
+ * puts the packet to the queue
+ *
+ * @return NDIST_STATUS_SUCCESS iff the packet was enqueued successfully
+ * and error status otherwise.
+ * NOTE: that the success status does NOT mean that the packet processing is completed, but only that it was enqueued successfully
+ * the packet can be returned to the caller protocol/moniport only in case the bReleasePacket was set to true (in this case the copy of the packet was enqueued)
+ * or if vboxNetFltWinQuEnqueuePacket failed, i.e. the packet was NOT enqueued
+ */
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinQuEnqueuePacket(PVBOXNETFLTINS pInstance, PVOID pPacket, const UINT fPacketFlags)
+{
+    PVBOXNETFLT_PACKET_INFO pInfo;
+    PVBOXNETFLT_PACKET_QUEUE_WORKER pWorker = &pInstance->u.s.PacketQueueWorker;
+    NDIS_STATUS fStatus = NDIS_STATUS_SUCCESS;
+
+    do
+    {
+        if (fPacketFlags & PACKET_COPY)
+        {
+            PNDIS_BUFFER pBuffer = NULL;
+            UINT cBufferCount;
+            UINT uBytesCopied = 0;
+            UINT cbPacketLength;
+            PINTNETSG pSG;
+
+            /* the packet is Ndis packet */
+            Assert(!(fPacketFlags & PACKET_SG));
+            Assert(!(fPacketFlags & PACKET_MINE));
+
+            NdisQueryPacket((PNDIS_PACKET)pPacket,
+                    NULL,
+                    &cBufferCount,
+                    &pBuffer,
+                    &cbPacketLength);
+
+
+            Assert(cBufferCount);
+
+            fStatus = vboxNetFltWinAllocSG(cbPacketLength, &pSG);
+            if (fStatus != NDIS_STATUS_SUCCESS)
+            {
+                AssertFailed();
+                break;
+            }
+
+            pInfo = vboxNetFltWinPpAllocPacketInfo(&pWorker->PacketInfoPool);
+
+            if (!pInfo)
+            {
+                AssertFailed();
+                /** @todo what status to set? */
+                fStatus = NDIS_STATUS_FAILURE;
+                vboxNetFltWinMemFree(pSG);
+                break;
+            }
+
+            Assert(pInfo->pPool);
+
+            /* the packet we are queueing is SG, add PACKET_SG to flags */
+            SET_FLAGS_TO_INFO(pInfo, fPacketFlags | PACKET_SG);
+            SET_PACKET_TO_INFO(pInfo, pSG);
+
+            fStatus = vboxNetFltWinNdisBufferMoveToSG0(pBuffer, pSG);
+            if (fStatus != NDIS_STATUS_SUCCESS)
+            {
+                AssertFailed();
+                vboxNetFltWinPpFreePacketInfo(pInfo);
+                vboxNetFltWinMemFree(pSG);
+                break;
+            }
+
+            DBG_CHECK_PACKET_AND_SG((PNDIS_PACKET)pPacket, pSG);
+        }
+        else
+        {
+            pInfo = vboxNetFltWinPpAllocPacketInfo(&pWorker->PacketInfoPool);
+
+            if (!pInfo)
+            {
+                AssertFailed();
+                /** @todo what status to set? */
+                fStatus = NDIS_STATUS_FAILURE;
+                break;
+            }
+
+            Assert(pInfo->pPool);
+
+            SET_FLAGS_TO_INFO(pInfo, fPacketFlags);
+            SET_PACKET_TO_INFO(pInfo, pPacket);
+        }
+
+        vboxNetFltWinQuEnqueueInfo(pWorker, pInfo);
+
+    } while (0);
+
+    return fStatus;
+}
+#endif
+
+
+/*
+ * netflt
+ */
+#ifndef VBOXNETADP
+static NDIS_STATUS vboxNetFltWinSynchNdisRequest(PVBOXNETFLTINS pNetFlt, PNDIS_REQUEST pRequest)
+{
+    int rc;
+
+    Assert(KeGetCurrentIrql() < DISPATCH_LEVEL);
+
+    /* 1. serialize */
+    rc = RTSemFastMutexRequest(pNetFlt->u.s.WinIf.hSynchRequestMutex); AssertRC(rc);
+    if (RT_SUCCESS(rc))
+    {
+        NDIS_STATUS fRequestStatus = NDIS_STATUS_SUCCESS;
+
+        /* 2. set pNetFlt->u.s.pSynchRequest */
+        Assert(!pNetFlt->u.s.WinIf.pSynchRequest);
+        pNetFlt->u.s.WinIf.pSynchRequest = pRequest;
+
+        /* 3. call NdisRequest */
+        NdisRequest(&fRequestStatus, pNetFlt->u.s.WinIf.hBinding, pRequest);
+
+        if (fRequestStatus == NDIS_STATUS_PENDING)
+        {
+        /* 3.1 if pending wait and assign the resulting status */
+            KeWaitForSingleObject(&pNetFlt->u.s.WinIf.hSynchCompletionEvent, Executive,
+                            KernelMode, FALSE, NULL);
+
+            fRequestStatus = pNetFlt->u.s.WinIf.SynchCompletionStatus;
+        }
+
+        /* 4. clear the pNetFlt->u.s.pSynchRequest */
+        pNetFlt->u.s.WinIf.pSynchRequest = NULL;
+
+        RTSemFastMutexRelease(pNetFlt->u.s.WinIf.hSynchRequestMutex); AssertRC(rc);
+        return fRequestStatus;
+    }
+    return NDIS_STATUS_FAILURE;
+}
+
+
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinGetMacAddress(PVBOXNETFLTINS pNetFlt, PRTMAC pMac)
+{
+    NDIS_REQUEST request;
+    NDIS_STATUS status;
+    request.RequestType = NdisRequestQueryInformation;
+    request.DATA.QUERY_INFORMATION.InformationBuffer = pMac;
+    request.DATA.QUERY_INFORMATION.InformationBufferLength = sizeof(RTMAC);
+    request.DATA.QUERY_INFORMATION.Oid = OID_802_3_CURRENT_ADDRESS;
+    status = vboxNetFltWinSynchNdisRequest(pNetFlt, &request);
+    if (status != NDIS_STATUS_SUCCESS)
+    {
+        /** @todo */
+        AssertFailed();
+    }
+
+    return status;
+
+}
+
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinQueryPhysicalMedium(PVBOXNETFLTINS pNetFlt, NDIS_PHYSICAL_MEDIUM * pMedium)
+{
+    NDIS_REQUEST Request;
+    NDIS_STATUS Status;
+    Request.RequestType = NdisRequestQueryInformation;
+    Request.DATA.QUERY_INFORMATION.InformationBuffer = pMedium;
+    Request.DATA.QUERY_INFORMATION.InformationBufferLength = sizeof(NDIS_PHYSICAL_MEDIUM);
+    Request.DATA.QUERY_INFORMATION.Oid = OID_GEN_PHYSICAL_MEDIUM;
+    Status = vboxNetFltWinSynchNdisRequest(pNetFlt, &Request);
+    if (Status != NDIS_STATUS_SUCCESS)
+    {
+        if (Status == NDIS_STATUS_NOT_SUPPORTED || Status == NDIS_STATUS_NOT_RECOGNIZED || Status == NDIS_STATUS_INVALID_OID)
+        {
+            Status = NDIS_STATUS_NOT_SUPPORTED;
+        }
+        else
+        {
+            LogRel(("OID_GEN_PHYSICAL_MEDIUM failed: Status (0x%x)", Status));
+            AssertFailed();
+        }
+    }
+    return Status;
+}
+
+DECLHIDDEN(bool) vboxNetFltWinIsPromiscuous(PVBOXNETFLTINS pNetFlt)
+{
+    /** @todo r=bird: This is too slow and is probably returning the wrong
+     *        information. What we're interested in is whether someone besides us
+     *        has put the interface into promiscuous mode. */
+    NDIS_REQUEST request;
+    NDIS_STATUS status;
+    ULONG filter;
+    Assert(VBOXNETFLT_PROMISCUOUS_SUPPORTED(pNetFlt));
+    request.RequestType = NdisRequestQueryInformation;
+    request.DATA.QUERY_INFORMATION.InformationBuffer = &filter;
+    request.DATA.QUERY_INFORMATION.InformationBufferLength = sizeof(filter);
+    request.DATA.QUERY_INFORMATION.Oid = OID_GEN_CURRENT_PACKET_FILTER;
+    status = vboxNetFltWinSynchNdisRequest(pNetFlt, &request);
+    if (status != NDIS_STATUS_SUCCESS)
+    {
+        /** @todo */
+        AssertFailed();
+        return false;
+    }
+    return (filter & NDIS_PACKET_TYPE_PROMISCUOUS) != 0;
+}
+
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinSetPromiscuous(PVBOXNETFLTINS pNetFlt, bool bYes)
+{
+/** @todo Need to report changes to the switch via:
+ *  pThis->pSwitchPort->pfnReportPromiscuousMode(pThis->pSwitchPort, fPromisc);
+ */
+    Assert(VBOXNETFLT_PROMISCUOUS_SUPPORTED(pNetFlt));
+    if (VBOXNETFLT_PROMISCUOUS_SUPPORTED(pNetFlt))
+    {
+        NDIS_REQUEST Request;
+        NDIS_STATUS fStatus;
+        ULONG fFilter;
+        ULONG fExpectedFilter;
+        ULONG fOurFilter;
+        Request.RequestType = NdisRequestQueryInformation;
+        Request.DATA.QUERY_INFORMATION.InformationBuffer = &fFilter;
+        Request.DATA.QUERY_INFORMATION.InformationBufferLength = sizeof(fFilter);
+        Request.DATA.QUERY_INFORMATION.Oid = OID_GEN_CURRENT_PACKET_FILTER;
+        fStatus = vboxNetFltWinSynchNdisRequest(pNetFlt, &Request);
+        if (fStatus != NDIS_STATUS_SUCCESS)
+        {
+            /** @todo */
+            AssertFailed();
+            return fStatus;
+        }
+
+        if (!pNetFlt->u.s.WinIf.StateFlags.fUpperProtSetFilterInitialized)
+        {
+            /* the cache was not initialized yet, initiate it with the current filter value */
+            pNetFlt->u.s.WinIf.fUpperProtocolSetFilter = fFilter;
+            pNetFlt->u.s.WinIf.StateFlags.fUpperProtSetFilterInitialized = TRUE;
+        }
+
+
+        if (bYes)
+        {
+            fExpectedFilter = NDIS_PACKET_TYPE_PROMISCUOUS;
+            fOurFilter = NDIS_PACKET_TYPE_PROMISCUOUS;
+        }
+        else
+        {
+            fExpectedFilter = pNetFlt->u.s.WinIf.fUpperProtocolSetFilter;
+            fOurFilter = 0;
+        }
+
+        if (fExpectedFilter != fFilter)
+        {
+            Request.RequestType = NdisRequestSetInformation;
+            Request.DATA.SET_INFORMATION.InformationBuffer = &fExpectedFilter;
+            Request.DATA.SET_INFORMATION.InformationBufferLength = sizeof(fExpectedFilter);
+            Request.DATA.SET_INFORMATION.Oid = OID_GEN_CURRENT_PACKET_FILTER;
+            fStatus = vboxNetFltWinSynchNdisRequest(pNetFlt, &Request);
+            if (fStatus != NDIS_STATUS_SUCCESS)
+            {
+                /** @todo */
+                AssertFailed();
+                return fStatus;
+            }
+        }
+        pNetFlt->u.s.WinIf.fOurSetFilter = fOurFilter;
+        return fStatus;
+    }
+    return NDIS_STATUS_NOT_SUPPORTED;
+}
+
+#else /* VBOXNETADP */
+
+/**
+ *  Generates a new unique MAC address based on our vendor ID
+ */
+DECLHIDDEN(void) vboxNetFltWinGenerateMACAddress(RTMAC *pMac)
+{
+    /* temporary use a time info */
+    uint64_t NanoTS = RTTimeSystemNanoTS();
+    pMac->au8[0] = (uint8_t)((VBOXNETADP_VENDOR_ID >> 16) & 0xff);
+    pMac->au8[1] = (uint8_t)((VBOXNETADP_VENDOR_ID >> 8) & 0xff);
+    pMac->au8[2] = (uint8_t)(VBOXNETADP_VENDOR_ID & 0xff);
+    pMac->au8[3] = (uint8_t)(NanoTS & 0xff0000);
+    pMac->au16[2] = (uint16_t)(NanoTS & 0xffff);
+}
+
+DECLHIDDEN(int) vboxNetFltWinMAC2NdisString(RTMAC *pMac, PNDIS_STRING pNdisString)
+{
+    static const char s_achDigits[17] = "0123456789abcdef";
+    PWSTR pString;
+
+    /* validate parameters */
+    AssertPtrReturn(pMac, VERR_INVALID_PARAMETER);
+    AssertPtrReturn(pNdisString, VERR_INVALID_PARAMETER);
+    AssertReturn(pNdisString->MaximumLength >= 13*sizeof(pNdisString->Buffer[0]), VERR_INVALID_PARAMETER);
+
+    pString = pNdisString->Buffer;
+
+    for (int i = 0; i < 6; i++)
+    {
+        uint8_t u8 = pMac->au8[i];
+        pString[0] = s_achDigits[(u8 >>  4) & 0xf];
+        pString[1] = s_achDigits[(u8/*>>0*/)& 0xf];
+        pString += 2;
+    }
+
+    pNdisString->Length = 12*sizeof(pNdisString->Buffer[0]);
+
+    *pString = L'\0';
+
+    return VINF_SUCCESS;
+}
+
+static int vboxNetFltWinWchar2Byte(WCHAR c, uint8_t *pb)
+{
+    if (c >= L'A' && c <= L'F')
+        *pb = (c - L'A') + 10;
+    else if (c >= L'a' && c <= L'f')
+        *pb = (c - L'a') + 10;
+    else if (c >= L'0' && c <= L'9')
+        *pb = (c - L'0');
+    else
+        return VERR_INVALID_PARAMETER;
+    return VINF_SUCCESS;
+}
+
+DECLHIDDEN(int) vboxNetFltWinMACFromNdisString(RTMAC *pMac, PNDIS_STRING pNdisString)
+{
+
+    /* validate parameters */
+    AssertPtrReturn(pMac, VERR_INVALID_PARAMETER);
+    AssertPtrReturn(pNdisString, VERR_INVALID_PARAMETER);
+    AssertReturn(pNdisString->Length >= 12*sizeof(pNdisString->Buffer[0]), VERR_INVALID_PARAMETER);
+
+    int rc = VINF_SUCCESS;
+    PWSTR pString = pNdisString->Buffer;
+    for (int i = 0; i < 6; i++)
+    {
+        uint8_t v1, v2;
+        rc = vboxNetFltWinWchar2Byte(pString[0], &v1);
+        if (RT_FAILURE(rc))
+            break;
+
+        rc = vboxNetFltWinWchar2Byte(pString[1], &v2);
+        if (RT_FAILURE(rc))
+            break;
+
+        pMac->au8[i] = (v1 << 4) | v2;
+
+        pString += 2;
+    }
+
+    return rc;
+}
+
+#endif /* VBOXNETADP */
+
+/**
+ * creates a NDIS_PACKET from the PINTNETSG
+ */
+DECLHIDDEN(PNDIS_PACKET) vboxNetFltWinNdisPacketFromSG(PVBOXNETFLTINS pNetFlt, PINTNETSG pSG, PVOID pBufToFree, bool bToWire, bool bCopyMemory)
+{
+    NDIS_STATUS fStatus;
+    PNDIS_PACKET pPacket;
+
+    Assert(pSG->aSegs[0].pv);
+    Assert(pSG->cbTotal >= VBOXNETFLT_PACKET_ETHEADER_SIZE);
+
+/** @todo Hrmpf, how can we fix this assumption?  I fear this'll cause data
+ *        corruption and maybe even BSODs ... */
+    AssertReturn(pSG->cSegsUsed == 1 || bCopyMemory, NULL);
+
+#ifdef VBOXNETADP
+    NdisAllocatePacket(&fStatus, &pPacket, pNetFlt->u.s.WinIf.hRecvPacketPool);
+#else
+    NdisAllocatePacket(&fStatus, &pPacket, bToWire ? pNetFlt->u.s.WinIf.hSendPacketPool : pNetFlt->u.s.WinIf.hRecvPacketPool);
+#endif
+    if (fStatus == NDIS_STATUS_SUCCESS)
+    {
+        PNDIS_BUFFER pBuffer;
+        PVOID pvMemBuf;
+
+        /** @todo generally we do not always need to zero-initialize the complete OOB data here, reinitialize only when/what we need,
+         * however we DO need to reset the status for the packets we indicate via NdisMIndicateReceivePacket to avoid packet loss
+         * in case the status contains NDIS_STATUS_RESOURCES */
+        VBOXNETFLT_OOB_INIT(pPacket);
+
+        if (bCopyMemory)
+        {
+            fStatus = vboxNetFltWinMemAlloc(&pvMemBuf, pSG->cbTotal);
+            Assert(fStatus == NDIS_STATUS_SUCCESS);
+            if (fStatus == NDIS_STATUS_SUCCESS)
+                IntNetSgRead(pSG, pvMemBuf);
+        }
+        else
+        {
+            pvMemBuf = pSG->aSegs[0].pv;
+        }
+        if (fStatus == NDIS_STATUS_SUCCESS)
+        {
+#ifdef VBOXNETADP
+            NdisAllocateBuffer(&fStatus, &pBuffer,
+                    pNetFlt->u.s.WinIf.hRecvBufferPool,
+                    pvMemBuf,
+                    pSG->cbTotal);
+#else
+            NdisAllocateBuffer(&fStatus, &pBuffer,
+                    bToWire ? pNetFlt->u.s.WinIf.hSendBufferPool : pNetFlt->u.s.WinIf.hRecvBufferPool,
+                    pvMemBuf,
+                    pSG->cbTotal);
+#endif
+
+            if (fStatus == NDIS_STATUS_SUCCESS)
+            {
+                NdisChainBufferAtBack(pPacket, pBuffer);
+
+                if (bToWire)
+                {
+                    PVBOXNETFLT_PKTRSVD_PT pSendInfo = (PVBOXNETFLT_PKTRSVD_PT)pPacket->ProtocolReserved;
+                    pSendInfo->pOrigPacket = NULL;
+                    pSendInfo->pBufToFree = pBufToFree;
+#ifdef VBOX_LOOPBACK_USEFLAGS
+                    /* set "don't loopback" flags */
+                    NdisGetPacketFlags(pPacket) = g_VBoxNetFltGlobalsWin.fPacketDontLoopBack;
+#else
+                    NdisGetPacketFlags(pPacket) = 0;
+#endif
+                }
+                else
+                {
+                    PVBOXNETFLT_PKTRSVD_MP pRecvInfo = (PVBOXNETFLT_PKTRSVD_MP)pPacket->MiniportReserved;
+                    pRecvInfo->pOrigPacket = NULL;
+                    pRecvInfo->pBufToFree = pBufToFree;
+
+                    /* we must set the header size on receive */
+                    NDIS_SET_PACKET_HEADER_SIZE(pPacket, VBOXNETFLT_PACKET_ETHEADER_SIZE);
+                    /* NdisAllocatePacket zero-initializes the OOB data,
+                     * but keeps the packet flags, clean them here */
+                    NdisGetPacketFlags(pPacket) = 0;
+                }
+                /** @todo set out of bound data */
+            }
+            else
+            {
+                AssertFailed();
+                if (bCopyMemory)
+                {
+                    vboxNetFltWinMemFree(pvMemBuf);
+                }
+                NdisFreePacket(pPacket);
+                pPacket = NULL;
+            }
+        }
+        else
+        {
+            AssertFailed();
+            NdisFreePacket(pPacket);
+            pPacket = NULL;
+        }
+    }
+    else
+    {
+        pPacket = NULL;
+    }
+
+    DBG_CHECK_PACKET_AND_SG(pPacket, pSG);
+
+    return pPacket;
+}
+
+/*
+ * frees NDIS_PACKET created with vboxNetFltWinNdisPacketFromSG
+ */
+DECLHIDDEN(void) vboxNetFltWinFreeSGNdisPacket(PNDIS_PACKET pPacket, bool bFreeMem)
+{
+    UINT cBufCount;
+    PNDIS_BUFFER pFirstBuffer;
+    UINT uTotalPacketLength;
+    PNDIS_BUFFER pBuffer;
+
+    NdisQueryPacket(pPacket, NULL, &cBufCount, &pFirstBuffer, &uTotalPacketLength);
+
+    Assert(cBufCount == 1);
+
+    do
+    {
+        NdisUnchainBufferAtBack(pPacket, &pBuffer);
+        if (pBuffer != NULL)
+        {
+            PVOID pvMemBuf;
+            UINT cbLength;
+
+            NdisQueryBufferSafe(pBuffer, &pvMemBuf, &cbLength, NormalPagePriority);
+            NdisFreeBuffer(pBuffer);
+            if (bFreeMem)
+            {
+                vboxNetFltWinMemFree(pvMemBuf);
+            }
+        }
+        else
+        {
+            break;
+        }
+    } while (true);
+
+    NdisFreePacket(pPacket);
+}
+
+#if !defined(VBOXNETADP)
+static void vboxNetFltWinAssociateMiniportProtocol(PVBOXNETFLTGLOBALS_WIN pGlobalsWin)
+{
+    NdisIMAssociateMiniport(pGlobalsWin->Mp.hMiniport, pGlobalsWin->Pt.hProtocol);
+}
+#endif
+
+/*
+ * NetFlt driver unload function
+ */
+DECLHIDDEN(VOID) vboxNetFltWinUnload(IN PDRIVER_OBJECT DriverObject)
+{
+    int rc;
+    UNREFERENCED_PARAMETER(DriverObject);
+
+    LogFlowFunc(("ENTER: DO (0x%x)\n", DriverObject));
+
+    rc = vboxNetFltWinFiniIdc();
+    if (RT_FAILURE(rc))
+    {
+        /** @todo we can not prevent driver unload here */
+        AssertFailed();
+
+        LogFlowFunc(("vboxNetFltWinFiniIdc - failed, busy.\n"));
+    }
+
+    vboxNetFltWinJobFiniQueue(&g_VBoxJobQueue);
+#ifndef VBOXNETADP
+    vboxNetFltWinPtDeregister(&g_VBoxNetFltGlobalsWin.Pt);
+#endif
+
+    vboxNetFltWinMpDeregister(&g_VBoxNetFltGlobalsWin.Mp);
+
+#ifndef VBOXNETADP
+    NdisFreeSpinLock(&g_VBoxNetFltGlobalsWin.lockFilters);
+#endif /* VBOXNETADP */
+
+    LogFlow(("LEAVE: DO (0x%x)\n", DriverObject));
+
+    vboxNetFltWinFiniNetFltBase();
+    /* don't use logging or any RT after de-init */
+}
+
+RT_C_DECLS_BEGIN
+
+NTSTATUS DriverEntry(IN PDRIVER_OBJECT DriverObject, IN PUNICODE_STRING RegistryPath);
+
+RT_C_DECLS_END
+
+NTSTATUS DriverEntry(IN PDRIVER_OBJECT DriverObject, IN PUNICODE_STRING RegistryPath)
+{
+    NDIS_STATUS Status = NDIS_STATUS_SUCCESS;
+    int rc;
+
+    /* the idc registration is initiated via IOCTL since our driver
+     * can be loaded when the VBoxDrv is not in case we are a Ndis IM driver */
+    rc = vboxNetFltWinInitNetFltBase();
+    AssertRC(rc);
+    if (RT_SUCCESS(rc))
+    {
+        Status = vboxNetFltWinJobInitQueue(&g_VBoxJobQueue);
+        Assert(Status == STATUS_SUCCESS);
+        if (Status == STATUS_SUCCESS)
+        {
+            ULONG MjVersion;
+            ULONG MnVersion;
+
+            /* note: we do it after we initialize the Job Queue */
+            vboxNetFltWinStartInitIdcProbing();
+
+            NdisZeroMemory(&g_VBoxNetFltGlobalsWin, sizeof (g_VBoxNetFltGlobalsWin));
+            KeInitializeEvent(&g_VBoxNetFltGlobalsWin.SynchEvent, SynchronizationEvent, TRUE /* signalled*/);
+
+            PsGetVersion(&MjVersion, &MnVersion,
+              NULL, /* PULONG BuildNumber OPTIONAL */
+              NULL /* PUNICODE_STRING CSDVersion OPTIONAL */
+              );
+
+            g_VBoxNetFltGlobalsWin.fPacketDontLoopBack = NDIS_FLAGS_DONT_LOOPBACK;
+
+            if (MjVersion == 5 && MnVersion == 0)
+            {
+                /* this is Win2k, we don't support it actually, but just in case */
+                g_VBoxNetFltGlobalsWin.fPacketDontLoopBack |= NDIS_FLAGS_SKIP_LOOPBACK_W2K;
+            }
+
+            g_VBoxNetFltGlobalsWin.fPacketIsLoopedBack = NDIS_FLAGS_IS_LOOPBACK_PACKET;
+
+#ifndef VBOXNETADP
+            RTListInit(&g_VBoxNetFltGlobalsWin.listFilters);
+            NdisAllocateSpinLock(&g_VBoxNetFltGlobalsWin.lockFilters);
+#endif
+
+            Status = vboxNetFltWinMpRegister(&g_VBoxNetFltGlobalsWin.Mp, DriverObject, RegistryPath);
+            Assert(Status == STATUS_SUCCESS);
+            if (Status == NDIS_STATUS_SUCCESS)
+            {
+#ifndef VBOXNETADP
+                Status = vboxNetFltWinPtRegister(&g_VBoxNetFltGlobalsWin.Pt, DriverObject, RegistryPath);
+                Assert(Status == STATUS_SUCCESS);
+                if (Status == NDIS_STATUS_SUCCESS)
+#endif
+                {
+#ifndef VBOXNETADP
+                    vboxNetFltWinAssociateMiniportProtocol(&g_VBoxNetFltGlobalsWin);
+#endif
+                    return STATUS_SUCCESS;
+
+//#ifndef VBOXNETADP
+//                vboxNetFltWinPtDeregister(&g_VBoxNetFltGlobalsWin.Pt);
+//#endif
+                }
+#ifndef VBOXNETADP /* unreachable for VBOXNETADP because of the above return */
+                vboxNetFltWinMpDeregister(&g_VBoxNetFltGlobalsWin.Mp);
+# ifndef VBOXNETADP
+                NdisFreeSpinLock(&g_VBoxNetFltGlobalsWin.lockFilters);
+# endif
+#endif
+            }
+            vboxNetFltWinJobFiniQueue(&g_VBoxJobQueue);
+        }
+        vboxNetFltWinFiniNetFlt();
+    }
+    else
+    {
+        Status = NDIS_STATUS_FAILURE;
+    }
+
+    return Status;
+}
+
+#ifndef VBOXNETADP
+/**
+ * creates and initializes the packet to be sent to the underlying miniport given a packet posted to our miniport edge
+ * according to DDK docs we must create our own packet rather than posting the one passed to us
+ */
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinPrepareSendPacket(PVBOXNETFLTINS pNetFlt, PNDIS_PACKET pPacket, PNDIS_PACKET *ppMyPacket)
+{
+    NDIS_STATUS Status;
+
+    NdisAllocatePacket(&Status, ppMyPacket, pNetFlt->u.s.WinIf.hSendPacketPool);
+
+    if (Status == NDIS_STATUS_SUCCESS)
+    {
+        PVBOXNETFLT_PKTRSVD_PT pSendInfo = (PVBOXNETFLT_PKTRSVD_PT)((*ppMyPacket)->ProtocolReserved);
+        pSendInfo->pOrigPacket = pPacket;
+        pSendInfo->pBufToFree = NULL;
+        /* the rest will be filled on send */
+
+        vboxNetFltWinCopyPacketInfoOnSend(*ppMyPacket, pPacket);
+
+#ifdef VBOX_LOOPBACK_USEFLAGS
+        NdisGetPacketFlags(*ppMyPacket) |= g_VBoxNetFltGlobalsWin.fPacketDontLoopBack;
+#endif
+    }
+    else
+    {
+        *ppMyPacket = NULL;
+    }
+
+    return Status;
+}
+
+/**
+ * creates and initializes the packet to be sent to the upperlying protocol given a packet indicated to our protocol edge
+ * according to DDK docs we must create our own packet rather than posting the one passed to us
+ */
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinPrepareRecvPacket(PVBOXNETFLTINS pNetFlt, PNDIS_PACKET pPacket, PNDIS_PACKET *ppMyPacket, bool bDpr)
+{
+    NDIS_STATUS Status;
+
+    if (bDpr)
+    {
+        Assert(KeGetCurrentIrql() == DISPATCH_LEVEL);
+        NdisDprAllocatePacket(&Status, ppMyPacket, pNetFlt->u.s.WinIf.hRecvPacketPool);
+    }
+    else
+    {
+        NdisAllocatePacket(&Status, ppMyPacket, pNetFlt->u.s.WinIf.hRecvPacketPool);
+    }
+
+    if (Status == NDIS_STATUS_SUCCESS)
+    {
+        PVBOXNETFLT_PKTRSVD_MP pRecvInfo = (PVBOXNETFLT_PKTRSVD_MP)((*ppMyPacket)->MiniportReserved);
+        pRecvInfo->pOrigPacket = pPacket;
+        pRecvInfo->pBufToFree = NULL;
+
+        Status = vboxNetFltWinCopyPacketInfoOnRecv(*ppMyPacket, pPacket, false);
+    }
+    else
+    {
+        *ppMyPacket = NULL;
+    }
+    return Status;
+}
+#endif
+/**
+ * initializes the VBOXNETFLTINS (our context structure) and binds to the given adapter
+ */
+#if defined(VBOXNETADP)
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinPtInitBind(PVBOXNETFLTINS *ppNetFlt, NDIS_HANDLE hMiniportAdapter, PNDIS_STRING pBindToMiniportName /* actually this is our miniport name*/, NDIS_HANDLE hWrapperConfigurationContext)
+#else
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinPtInitBind(PVBOXNETFLTINS *ppNetFlt, PNDIS_STRING pOurMiniportName, PNDIS_STRING pBindToMiniportName)
+#endif
+{
+    NDIS_STATUS Status;
+    do
+    {
+        ANSI_STRING AnsiString;
+        int rc;
+        PVBOXNETFLTINS pInstance;
+        USHORT cbAnsiName = pBindToMiniportName->Length;/* the length is is bytes ; *2 ;RtlUnicodeStringToAnsiSize(pBindToMiniportName)*/
+        CREATE_INSTANCE_CONTEXT Context;
+
+# ifndef VBOXNETADP
+        Context.pOurName = pOurMiniportName;
+        Context.pBindToName = pBindToMiniportName;
+# else
+        Context.hMiniportAdapter = hMiniportAdapter;
+        Context.hWrapperConfigurationContext = hWrapperConfigurationContext;
+# endif
+        Context.Status = NDIS_STATUS_SUCCESS;
+
+        AnsiString.Buffer = 0; /* will be allocated by RtlUnicodeStringToAnsiString */
+        AnsiString.Length = 0;
+        AnsiString.MaximumLength = cbAnsiName;
+
+        Assert(KeGetCurrentIrql() == PASSIVE_LEVEL);
+
+        Status = RtlUnicodeStringToAnsiString(&AnsiString, pBindToMiniportName, true);
+
+        if (Status != STATUS_SUCCESS)
+        {
+            break;
+        }
+
+        rc = vboxNetFltSearchCreateInstance(&g_VBoxNetFltGlobals, AnsiString.Buffer, &pInstance, &Context);
+        RtlFreeAnsiString(&AnsiString);
+        if (RT_FAILURE(rc))
+        {
+            AssertFailed();
+            Status = Context.Status != NDIS_STATUS_SUCCESS ? Context.Status : NDIS_STATUS_FAILURE;
+            break;
+        }
+
+        Assert(pInstance);
+
+        if (rc == VINF_ALREADY_INITIALIZED)
+        {
+            /* the case when our adapter was unbound while IntNet was connected to it */
+            /* the instance remains valid until IntNet disconnects from it, we simply search and re-use it*/
+            rc = vboxNetFltWinAttachToInterface(pInstance, &Context, true);
+            if (RT_FAILURE(rc))
+            {
+                AssertFailed();
+                Status = Context.Status != NDIS_STATUS_SUCCESS ? Context.Status : NDIS_STATUS_FAILURE;
+                /* release netflt */
+                vboxNetFltRelease(pInstance, false);
+
+                break;
+            }
+        }
+
+        *ppNetFlt = pInstance;
+
+    } while (FALSE);
+
+    return Status;
+}
+/*
+ * deinitializes the VBOXNETFLTWIN
+ */
+DECLHIDDEN(VOID) vboxNetFltWinPtFiniWinIf(PVBOXNETFLTWIN pWinIf)
+{
+#ifndef VBOXNETADP
+    int rc;
+#endif
+
+    LogFlowFunc(("ENTER: pWinIf 0x%p\n", pWinIf));
+
+    Assert(KeGetCurrentIrql() == PASSIVE_LEVEL);
+#ifndef VBOXNETADP
+    if (pWinIf->MpDeviceName.Buffer)
+    {
+        vboxNetFltWinMemFree(pWinIf->MpDeviceName.Buffer);
+    }
+
+    FINI_INTERLOCKED_SINGLE_LIST(&pWinIf->TransferDataList);
+# if defined(DEBUG_NETFLT_LOOPBACK) || !defined(VBOX_LOOPBACK_USEFLAGS)
+    FINI_INTERLOCKED_SINGLE_LIST(&pWinIf->SendPacketQueue);
+# endif
+    NdisFreeBufferPool(pWinIf->hSendBufferPool);
+    NdisFreePacketPool(pWinIf->hSendPacketPool);
+    rc = RTSemFastMutexDestroy(pWinIf->hSynchRequestMutex);  AssertRC(rc);
+#endif
+
+    /* NOTE: NULL is a valid handle */
+    NdisFreeBufferPool(pWinIf->hRecvBufferPool);
+    NdisFreePacketPool(pWinIf->hRecvPacketPool);
+
+    LogFlowFunc(("LEAVE: pWinIf 0x%p\n", pWinIf));
+}
+
+#ifndef VBOXNETADP
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinPtInitWinIf(PVBOXNETFLTWIN pWinIf, IN PNDIS_STRING pOurDeviceName)
+#else
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinPtInitWinIf(PVBOXNETFLTWIN pWinIf)
+#endif
+{
+    NDIS_STATUS Status = NDIS_STATUS_SUCCESS;
+#ifndef VBOXNETADP
+    int rc;
+#endif
+
+    LogFlowFunc(("ENTER: pWinIf 0x%p\n", pWinIf));
+
+    Assert(KeGetCurrentIrql() == PASSIVE_LEVEL);
+
+    NdisZeroMemory(pWinIf, sizeof (VBOXNETFLTWIN));
+    NdisAllocatePacketPoolEx(&Status, &pWinIf->hRecvPacketPool,
+                               VBOXNETFLT_PACKET_POOL_SIZE_NORMAL,
+                               VBOXNETFLT_PACKET_POOL_SIZE_OVERFLOW,
+                               PROTOCOL_RESERVED_SIZE_IN_PACKET);
+    Assert(Status == NDIS_STATUS_SUCCESS);
+    if (Status == NDIS_STATUS_SUCCESS)
+    {
+        /* NOTE: NULL is a valid handle !!! */
+        NdisAllocateBufferPool(&Status, &pWinIf->hRecvBufferPool, VBOXNETFLT_BUFFER_POOL_SIZE_RX);
+        Assert(Status == NDIS_STATUS_SUCCESS);
+        if (Status == NDIS_STATUS_SUCCESS)
+        {
+            pWinIf->MpState.PowerState = NdisDeviceStateD3;
+            vboxNetFltWinSetOpState(&pWinIf->MpState, kVBoxNetDevOpState_Deinitialized);
+#ifndef VBOXNETADP
+            pWinIf->PtState.PowerState = NdisDeviceStateD3;
+            vboxNetFltWinSetOpState(&pWinIf->PtState, kVBoxNetDevOpState_Deinitialized);
+
+            NdisAllocateBufferPool(&Status,
+                    &pWinIf->hSendBufferPool,
+                    VBOXNETFLT_BUFFER_POOL_SIZE_TX);
+            Assert(Status == NDIS_STATUS_SUCCESS);
+            if (Status == NDIS_STATUS_SUCCESS)
+            {
+                INIT_INTERLOCKED_SINGLE_LIST(&pWinIf->TransferDataList);
+
+# if defined(DEBUG_NETFLT_LOOPBACK) || !defined(VBOX_LOOPBACK_USEFLAGS)
+                INIT_INTERLOCKED_SINGLE_LIST(&pWinIf->SendPacketQueue);
+# endif
+                NdisInitializeEvent(&pWinIf->OpenCloseEvent);
+
+                KeInitializeEvent(&pWinIf->hSynchCompletionEvent, SynchronizationEvent, FALSE);
+
+                NdisInitializeEvent(&pWinIf->MpInitCompleteEvent);
+
+                NdisAllocatePacketPoolEx(&Status, &pWinIf->hSendPacketPool,
+                                           VBOXNETFLT_PACKET_POOL_SIZE_NORMAL,
+                                           VBOXNETFLT_PACKET_POOL_SIZE_OVERFLOW,
+                                           sizeof (PVBOXNETFLT_PKTRSVD_PT));
+                Assert(Status == NDIS_STATUS_SUCCESS);
+                if (Status == NDIS_STATUS_SUCCESS)
+                {
+                    rc = RTSemFastMutexCreate(&pWinIf->hSynchRequestMutex);
+                    AssertRC(rc);
+                    if (RT_SUCCESS(rc))
+                    {
+                        Status = vboxNetFltWinMemAlloc((PVOID*)&pWinIf->MpDeviceName.Buffer, pOurDeviceName->Length);
+                        Assert(Status == NDIS_STATUS_SUCCESS);
+                        if (Status == NDIS_STATUS_SUCCESS)
+                        {
+                            pWinIf->MpDeviceName.MaximumLength = pOurDeviceName->Length;
+                            pWinIf->MpDeviceName.Length = 0;
+                            Status = vboxNetFltWinCopyString(&pWinIf->MpDeviceName, pOurDeviceName);
+#endif
+                            return NDIS_STATUS_SUCCESS;
+#ifndef VBOXNETADP
+                            // unreachable: vboxNetFltWinMemFree(pWinIf->MpDeviceName.Buffer);
+                        }
+                        RTSemFastMutexDestroy(pWinIf->hSynchRequestMutex);
+                    }
+                    else
+                        Status = NDIS_STATUS_FAILURE;
+                    NdisFreePacketPool(pWinIf->hSendPacketPool);
+                }
+                NdisFreeBufferPool(pWinIf->hSendBufferPool);
+            }
+            NdisFreeBufferPool(pWinIf->hRecvBufferPool);
+#endif
+        }
+        NdisFreePacketPool(pWinIf->hRecvPacketPool);
+    }
+
+    LogFlowFunc(("LEAVE: pWinIf 0x%p, Status 0x%x\n", pWinIf, Status));
+
+    return Status;
+}
+
+/**
+ * match packets
+ */
+#define NEXT_LIST_ENTRY(_Entry) ((_Entry)->Flink)
+#define PREV_LIST_ENTRY(_Entry) ((_Entry)->Blink)
+#define FIRST_LIST_ENTRY NEXT_LIST_ENTRY
+#define LAST_LIST_ENTRY PREV_LIST_ENTRY
+
+#define MIN(_a, _b) ((_a) < (_b) ? (_a) : (_b))
+
+#ifndef VBOXNETADP
+
+#ifdef DEBUG_misha
+
+RTMAC g_vboxNetFltWinVerifyMACBroadcast = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
+RTMAC g_vboxNetFltWinVerifyMACGuest = {0x08, 0x00, 0x27, 0x01, 0x02, 0x03};
+
+DECLHIDDEN(PRTNETETHERHDR) vboxNetFltWinGetEthHdr(PNDIS_PACKET pPacket)
+{
+    UINT cBufCount1;
+    PNDIS_BUFFER pBuffer1;
+    UINT uTotalPacketLength1;
+    RTNETETHERHDR* pEth;
+    UINT cbLength1 = 0;
+    UINT i = 0;
+
+    NdisQueryPacket(pPacket, NULL, &cBufCount1, &pBuffer1, &uTotalPacketLength1);
+
+    Assert(pBuffer1);
+    Assert(uTotalPacketLength1 >= VBOXNETFLT_PACKET_ETHEADER_SIZE);
+    if (uTotalPacketLength1 < VBOXNETFLT_PACKET_ETHEADER_SIZE)
+        return NULL;
+
+    NdisQueryBufferSafe(pBuffer1, &pEth, &cbLength1, NormalPagePriority);
+    Assert(cbLength1 >= VBOXNETFLT_PACKET_ETHEADER_SIZE);
+    if (cbLength1 < VBOXNETFLT_PACKET_ETHEADER_SIZE)
+        return NULL;
+
+    return pEth;
+}
+
+DECLHIDDEN(PRTNETETHERHDR) vboxNetFltWinGetEthHdrSG(PINTNETSG pSG)
+{
+    Assert(pSG->cSegsUsed);
+    Assert(pSG->cSegsAlloc >= pSG->cSegsUsed);
+    Assert(pSG->aSegs[0].cb >= VBOXNETFLT_PACKET_ETHEADER_SIZE);
+
+    if (!pSG->cSegsUsed)
+        return NULL;
+
+    if (pSG->aSegs[0].cb < VBOXNETFLT_PACKET_ETHEADER_SIZE)
+        return NULL;
+
+    return (PRTNETETHERHDR)pSG->aSegs[0].pv;
+}
+
+DECLHIDDEN(bool) vboxNetFltWinCheckMACs(PNDIS_PACKET pPacket, PRTMAC pDst, PRTMAC pSrc)
+{
+    PRTNETETHERHDR pHdr = vboxNetFltWinGetEthHdr(pPacket);
+    Assert(pHdr);
+
+    if (!pHdr)
+        return false;
+
+    if (pDst && memcmp(pDst, &pHdr->DstMac, sizeof(RTMAC)))
+        return false;
+
+    if (pSrc && memcmp(pSrc, &pHdr->SrcMac, sizeof(RTMAC)))
+        return false;
+
+    return true;
+}
+
+DECLHIDDEN(bool) vboxNetFltWinCheckMACsSG(PINTNETSG pSG, PRTMAC pDst, PRTMAC pSrc)
+{
+    PRTNETETHERHDR pHdr = vboxNetFltWinGetEthHdrSG(pSG);
+    Assert(pHdr);
+
+    if (!pHdr)
+        return false;
+
+    if (pDst && memcmp(pDst, &pHdr->DstMac, sizeof(RTMAC)))
+        return false;
+
+    if (pSrc && memcmp(pSrc, &pHdr->SrcMac, sizeof(RTMAC)))
+        return false;
+
+    return true;
+}
+#endif
+
+# if !defined(VBOX_LOOPBACK_USEFLAGS) || defined(DEBUG_NETFLT_PACKETS)
+/*
+ * answers whether the two given packets match based on the packet length and the first cbMatch bytes of the packets
+ * if cbMatch < 0 matches complete packets.
+ */
+DECLHIDDEN(bool) vboxNetFltWinMatchPackets(PNDIS_PACKET pPacket1, PNDIS_PACKET pPacket2, const INT cbMatch)
+{
+    UINT cBufCount1;
+    PNDIS_BUFFER pBuffer1;
+    UINT uTotalPacketLength1;
+    uint8_t *pbMemBuf1 = NULL;
+    UINT cbLength1 = 0;
+
+    UINT cBufCount2;
+    PNDIS_BUFFER pBuffer2;
+    UINT uTotalPacketLength2;
+    uint8_t *pbMemBuf2 = NULL;
+    UINT cbLength2 = 0;
+    bool bMatch = true;
+
+#ifdef DEBUG_NETFLT_PACKETS
+    bool bCompleteMatch = false;
+#endif
+
+    NdisQueryPacket(pPacket1, NULL, &cBufCount1, &pBuffer1, &uTotalPacketLength1);
+    NdisQueryPacket(pPacket2, NULL, &cBufCount2, &pBuffer2, &uTotalPacketLength2);
+
+    Assert(pBuffer1);
+    Assert(pBuffer2);
+
+    if (uTotalPacketLength1 != uTotalPacketLength2)
+    {
+        bMatch = false;
+    }
+    else
+    {
+        UINT ucbLength2Match = 0;
+        UINT ucbMatch;
+        if (cbMatch < 0 || (UINT)cbMatch > uTotalPacketLength1)
+        {
+            /* NOTE: assuming uTotalPacketLength1 == uTotalPacketLength2*/
+            ucbMatch = uTotalPacketLength1;
+#ifdef DEBUG_NETFLT_PACKETS
+            bCompleteMatch = true;
+#endif
+        }
+        else
+        {
+            ucbMatch = (UINT)cbMatch;
+        }
+
+        for (;;)
+        {
+            if (!cbLength1)
+            {
+                NdisQueryBufferSafe(pBuffer1, &pbMemBuf1, &cbLength1, NormalPagePriority);
+                NdisGetNextBuffer(pBuffer1, &pBuffer1);
+            }
+            else
+            {
+                Assert(pbMemBuf1);
+                Assert(ucbLength2Match);
+                pbMemBuf1 += ucbLength2Match;
+            }
+
+            if (!cbLength2)
+            {
+                NdisQueryBufferSafe(pBuffer2, &pbMemBuf2, &cbLength2, NormalPagePriority);
+                NdisGetNextBuffer(pBuffer2, &pBuffer2);
+            }
+            else
+            {
+                Assert(pbMemBuf2);
+                Assert(ucbLength2Match);
+                pbMemBuf2 += ucbLength2Match;
+            }
+
+            ucbLength2Match = MIN(ucbMatch, cbLength1);
+            ucbLength2Match = MIN(ucbLength2Match, cbLength2);
+
+            if (memcmp(pbMemBuf1, pbMemBuf2, ucbLength2Match))
+            {
+                bMatch = false;
+                break;
+            }
+
+            ucbMatch -= ucbLength2Match;
+            if (!ucbMatch)
+                break;
+
+            cbLength1 -= ucbLength2Match;
+            cbLength2 -= ucbLength2Match;
+        }
+    }
+
+#ifdef DEBUG_NETFLT_PACKETS
+    if (bMatch && !bCompleteMatch)
+    {
+        /* check that the packets fully match */
+        DBG_CHECK_PACKETS(pPacket1, pPacket2);
+    }
+#endif
+
+    return bMatch;
+}
+
+/*
+ * answers whether the ndis packet and PINTNETSG match based on the packet length and the first cbMatch bytes of the packet and PINTNETSG
+ * if cbMatch < 0 matches complete packets.
+ */
+DECLHIDDEN(bool) vboxNetFltWinMatchPacketAndSG(PNDIS_PACKET pPacket, PINTNETSG pSG, const INT cbMatch)
+{
+    UINT cBufCount1;
+    PNDIS_BUFFER pBuffer1;
+    UINT uTotalPacketLength1;
+    uint8_t *pbMemBuf1 = NULL;
+    UINT cbLength1 = 0;
+    UINT uTotalPacketLength2 = pSG->cbTotal;
+    uint8_t *pbMemBuf2 = NULL;
+    UINT cbLength2 = 0;
+    bool bMatch = true;
+    bool bCompleteMatch = false;
+    UINT i = 0;
+
+    NdisQueryPacket(pPacket, NULL, &cBufCount1, &pBuffer1, &uTotalPacketLength1);
+
+    Assert(pBuffer1);
+    Assert(pSG->cSegsUsed);
+    Assert(pSG->cSegsAlloc >= pSG->cSegsUsed);
+
+    if (uTotalPacketLength1 != uTotalPacketLength2)
+    {
+        AssertFailed();
+        bMatch = false;
+    }
+    else
+    {
+        UINT ucbLength2Match = 0;
+        UINT ucbMatch;
+
+        if (cbMatch < 0 || (UINT)cbMatch > uTotalPacketLength1)
+        {
+            /* NOTE: assuming uTotalPacketLength1 == uTotalPacketLength2*/
+            ucbMatch = uTotalPacketLength1;
+            bCompleteMatch = true;
+        }
+        else
+        {
+            ucbMatch = (UINT)cbMatch;
+        }
+
+        for (;;)
+        {
+            if (!cbLength1)
+            {
+                NdisQueryBufferSafe(pBuffer1, &pbMemBuf1, &cbLength1, NormalPagePriority);
+                NdisGetNextBuffer(pBuffer1, &pBuffer1);
+            }
+            else
+            {
+                Assert(pbMemBuf1);
+                Assert(ucbLength2Match);
+                pbMemBuf1 += ucbLength2Match;
+            }
+
+            if (!cbLength2)
+            {
+                Assert(i < pSG->cSegsUsed);
+                pbMemBuf2 = (uint8_t*)pSG->aSegs[i].pv;
+                cbLength2 = pSG->aSegs[i].cb;
+                i++;
+            }
+            else
+            {
+                Assert(pbMemBuf2);
+                Assert(ucbLength2Match);
+                pbMemBuf2 += ucbLength2Match;
+            }
+
+            ucbLength2Match = MIN(ucbMatch, cbLength1);
+            ucbLength2Match = MIN(ucbLength2Match, cbLength2);
+
+            if (memcmp(pbMemBuf1, pbMemBuf2, ucbLength2Match))
+            {
+                bMatch = false;
+                AssertFailed();
+                break;
+            }
+
+            ucbMatch -= ucbLength2Match;
+            if (!ucbMatch)
+                break;
+
+            cbLength1 -= ucbLength2Match;
+            cbLength2 -= ucbLength2Match;
+        }
+    }
+
+    if (bMatch && !bCompleteMatch)
+    {
+        /* check that the packets fully match */
+        DBG_CHECK_PACKET_AND_SG(pPacket, pSG);
+    }
+    return bMatch;
+}
+
+#  if 0
+/*
+ * answers whether the two PINTNETSGs match based on the packet length and the first cbMatch bytes of the PINTNETSG
+ * if cbMatch < 0 matches complete packets.
+ */
+static bool vboxNetFltWinMatchSGs(PINTNETSG pSG1, PINTNETSG pSG2, const INT cbMatch)
+{
+    UINT uTotalPacketLength1 = pSG1->cbTotal;
+    PVOID pbMemBuf1 = NULL;
+    UINT cbLength1 = 0;
+    UINT i1 = 0;
+    UINT uTotalPacketLength2 = pSG2->cbTotal;
+    PVOID pbMemBuf2 = NULL;
+    UINT cbLength2 = 0;
+
+    bool bMatch = true;
+    bool bCompleteMatch = false;
+    UINT i2 = 0;
+
+    Assert(pSG1->cSegsUsed);
+    Assert(pSG2->cSegsUsed);
+    Assert(pSG1->cSegsAlloc >= pSG1->cSegsUsed);
+    Assert(pSG2->cSegsAlloc >= pSG2->cSegsUsed);
+
+    if (uTotalPacketLength1 != uTotalPacketLength2)
+    {
+        AssertFailed();
+        bMatch = false;
+    }
+    else
+    {
+        UINT ucbMatch;
+        if (cbMatch < 0 || (UINT)cbMatch > uTotalPacketLength1)
+        {
+            /* NOTE: assuming uTotalPacketLength1 == uTotalPacketLength2*/
+            ucbMatch = uTotalPacketLength1;
+            bCompleteMatch = true;
+        }
+        else
+        {
+            ucbMatch = (UINT)cbMatch;
+        }
+
+        do
+        {
+            UINT ucbLength2Match;
+            if (!cbLength1)
+            {
+                Assert(i1 < pSG1->cSegsUsed);
+                pbMemBuf1 = pSG1->aSegs[i1].pv;
+                cbLength1 = pSG1->aSegs[i1].cb;
+                i1++;
+            }
+
+            if (!cbLength2)
+            {
+                Assert(i2 < pSG2->cSegsUsed);
+                pbMemBuf2 = pSG2->aSegs[i2].pv;
+                cbLength2 = pSG2->aSegs[i2].cb;
+                i2++;
+            }
+
+            ucbLength2Match = MIN(ucbMatch, cbLength1);
+            ucbLength2Match = MIN(ucbLength2Match, cbLength2);
+
+            if (memcmp(pbMemBuf1, pbMemBuf2, ucbLength2Match))
+            {
+                bMatch = false;
+                AssertFailed();
+                break;
+            }
+            ucbMatch -= ucbLength2Match;
+            cbLength1 -= ucbLength2Match;
+            cbLength2 -= ucbLength2Match;
+        } while (ucbMatch);
+    }
+
+    if (bMatch && !bCompleteMatch)
+    {
+        /* check that the packets fully match */
+        DBG_CHECK_SGS(pSG1, pSG2);
+    }
+    return bMatch;
+}
+#  endif
+# endif
+#endif
+
+static void vboxNetFltWinFiniNetFltBase()
+{
+    do
+    {
+        vboxNetFltDeleteGlobals(&g_VBoxNetFltGlobals);
+
+        /*
+         * Undo the work done during start (in reverse order).
+         */
+        memset(&g_VBoxNetFltGlobals, 0, sizeof(g_VBoxNetFltGlobals));
+
+        RTLogDestroy(RTLogRelSetDefaultInstance(NULL));
+        RTLogDestroy(RTLogSetDefaultInstance(NULL));
+
+        RTR0Term();
+    } while (0);
+}
+
+/*
+ * Defines max timeout for waiting for driver unloading
+ * (3000 * 100 ms = 5 minutes)
+ */
+#define MAX_UNLOAD_PROBES 3000
+
+static int vboxNetFltWinFiniIdc()
+{
+    int rc;
+    int i;
+
+    vboxNetFltWinStopInitIdcProbing();
+
+    if (g_bVBoxIdcInitialized)
+    {
+         for (i = 0; (rc = vboxNetFltTryDeleteIdc(&g_VBoxNetFltGlobals)) == VERR_WRONG_ORDER
+            && i < MAX_UNLOAD_PROBES; i++)
+        {
+            RTThreadSleep(100);
+        }
+        if (i == MAX_UNLOAD_PROBES)
+        {
+            // seems something hungs in driver
+            LogFlow(("vboxNetFltWinFiniIdc - Can't delete Idc. pInH=%p cFRefs=%d fIDcOpen=%s",
+                        g_VBoxNetFltGlobals.pInstanceHead, g_VBoxNetFltGlobals.cFactoryRefs,
+                        g_VBoxNetFltGlobals.fIDCOpen ? "true" : "false"));
+            LogFlow(("vboxNetFltWinFiniIdc g_VBoxNetFltGlobalsWin cDvRefs=%d hDev=%x pDev=%p Mp=%x \n",
+                        g_VBoxNetFltGlobalsWin.cDeviceRefs, g_VBoxNetFltGlobalsWin.hDevice,
+                        g_VBoxNetFltGlobalsWin.pDevObj, g_VBoxNetFltGlobalsWin.Mp.hMiniport));
+            Assert(i == MAX_UNLOAD_PROBES);
+            return VERR_WRONG_ORDER;
+        }
+
+        if (RT_SUCCESS(rc))
+        {
+            g_bVBoxIdcInitialized = false;
+        }
+    }
+    else
+    {
+        rc = VINF_SUCCESS;
+    }
+    return rc;
+
+}
+
+static int vboxNetFltWinFiniNetFlt()
+{
+    int rc = vboxNetFltWinFiniIdc();
+    if (RT_SUCCESS(rc))
+    {
+        vboxNetFltWinFiniNetFltBase();
+    }
+    return rc;
+}
+
+/**
+ * base netflt initialization
+ */
+static int vboxNetFltWinInitNetFltBase()
+{
+    int rc;
+
+    do
+    {
+        Assert(!g_bVBoxIdcInitialized);
+
+        rc = RTR0Init(0);
+        if (!RT_SUCCESS(rc))
+        {
+            break;
+        }
+
+        memset(&g_VBoxNetFltGlobals, 0, sizeof(g_VBoxNetFltGlobals));
+        rc = vboxNetFltInitGlobals(&g_VBoxNetFltGlobals);
+        if (!RT_SUCCESS(rc))
+        {
+            RTR0Term();
+            break;
+        }
+    }while (0);
+
+    return rc;
+}
+
+/**
+ * initialize IDC
+ */
+static int vboxNetFltWinInitIdc()
+{
+    int rc;
+
+    do
+    {
+        if (g_bVBoxIdcInitialized)
+        {
+            rc = VINF_ALREADY_INITIALIZED;
+            break;
+        }
+
+        /*
+         * connect to the support driver.
+         *
+         * This will call back vboxNetFltOsOpenSupDrv (and maybe vboxNetFltOsCloseSupDrv)
+         * for establishing the connect to the support driver.
+         */
+        rc = vboxNetFltInitIdc(&g_VBoxNetFltGlobals);
+        if (!RT_SUCCESS(rc))
+        {
+            break;
+        }
+
+        g_bVBoxIdcInitialized = true;
+    } while (0);
+
+    return rc;
+}
+
+static VOID vboxNetFltWinInitIdcProbingWorker(PVOID pvContext)
+{
+    PINIT_IDC_INFO pInitIdcInfo = (PINIT_IDC_INFO)pvContext;
+    int rc = vboxNetFltWinInitIdc();
+    if (RT_FAILURE(rc))
+    {
+        bool bInterupted = ASMAtomicUoReadBool(&pInitIdcInfo->bStop);
+        if (!bInterupted)
+        {
+            RTThreadSleep(1000); /* 1 s */
+            bInterupted = ASMAtomicUoReadBool(&pInitIdcInfo->bStop);
+            if (!bInterupted)
+            {
+                vboxNetFltWinJobEnqueueJob(&g_VBoxJobQueue, &pInitIdcInfo->Job, false);
+                return;
+            }
+        }
+
+        /* it's interrupted */
+        rc = VERR_INTERRUPTED;
+    }
+
+    ASMAtomicUoWriteS32(&pInitIdcInfo->rc, rc);
+    KeSetEvent(&pInitIdcInfo->hCompletionEvent, 0, FALSE);
+}
+
+static int vboxNetFltWinStopInitIdcProbing()
+{
+    if (!g_VBoxInitIdcInfo.bInitialized)
+        return VERR_INVALID_STATE;
+
+    ASMAtomicUoWriteBool(&g_VBoxInitIdcInfo.bStop, true);
+    KeWaitForSingleObject(&g_VBoxInitIdcInfo.hCompletionEvent, Executive, KernelMode, FALSE, NULL);
+
+    return g_VBoxInitIdcInfo.rc;
+}
+
+static int vboxNetFltWinStartInitIdcProbing()
+{
+    Assert(!g_bVBoxIdcInitialized);
+    KeInitializeEvent(&g_VBoxInitIdcInfo.hCompletionEvent, NotificationEvent, FALSE);
+    g_VBoxInitIdcInfo.bStop = false;
+    g_VBoxInitIdcInfo.bInitialized = true;
+    vboxNetFltWinJobInit(&g_VBoxInitIdcInfo.Job, vboxNetFltWinInitIdcProbingWorker, &g_VBoxInitIdcInfo, false);
+    vboxNetFltWinJobEnqueueJob(&g_VBoxJobQueue, &g_VBoxInitIdcInfo.Job, false);
+    return VINF_SUCCESS;
+}
+
+static int vboxNetFltWinInitNetFlt()
+{
+    int rc;
+
+    do
+    {
+        rc = vboxNetFltWinInitNetFltBase();
+        if (RT_FAILURE(rc))
+        {
+            AssertFailed();
+            break;
+        }
+
+        /*
+         * connect to the support driver.
+         *
+         * This will call back vboxNetFltOsOpenSupDrv (and maybe vboxNetFltOsCloseSupDrv)
+         * for establishing the connect to the support driver.
+         */
+        rc = vboxNetFltWinInitIdc();
+        if (RT_FAILURE(rc))
+        {
+            AssertFailed();
+            vboxNetFltWinFiniNetFltBase();
+            break;
+        }
+    } while (0);
+
+    return rc;
+}
+
+/* detach*/
+static int vboxNetFltWinDeleteInstance(PVBOXNETFLTINS pThis)
+{
+    LogFlow(("vboxNetFltWinDeleteInstance: pThis=0x%p \n", pThis));
+
+    Assert(KeGetCurrentIrql() < DISPATCH_LEVEL);
+    Assert(pThis);
+    Assert(pThis->fDisconnectedFromHost);
+    Assert(!pThis->fRediscoveryPending);
+    Assert(pThis->enmTrunkState != INTNETTRUNKIFSTATE_ACTIVE);
+#ifndef VBOXNETADP
+    Assert(pThis->u.s.WinIf.PtState.OpState == kVBoxNetDevOpState_Deinitialized);
+    Assert(!pThis->u.s.WinIf.hBinding);
+#endif
+    Assert(pThis->u.s.WinIf.MpState.OpState == kVBoxNetDevOpState_Deinitialized);
+#ifndef VBOXNETFLT_NO_PACKET_QUEUE
+    Assert(!pThis->u.s.PacketQueueWorker.pSG);
+#endif
+
+    RTSemMutexDestroy(pThis->u.s.hWinIfMutex);
+
+    vboxNetFltWinDrvDereference();
+
+    return VINF_SUCCESS;
+}
+
+static NDIS_STATUS vboxNetFltWinDisconnectIt(PVBOXNETFLTINS pInstance)
+{
+#ifndef VBOXNETFLT_NO_PACKET_QUEUE
+    vboxNetFltWinQuFiniPacketQueue(pInstance);
+#else
+    RT_NOREF1(pInstance);
+#endif
+    return NDIS_STATUS_SUCCESS;
+}
+
+/* detach*/
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinDetachFromInterface(PVBOXNETFLTINS pNetFlt, bool bOnUnbind)
+{
+    NDIS_STATUS Status;
+    int rc;
+    LogFlowFunc(("ENTER: pThis=%0xp\n", pNetFlt));
+
+    Assert(KeGetCurrentIrql() < DISPATCH_LEVEL);
+    Assert(pNetFlt);
+
+    /* paranoia to ensure the instance is not removed while we're waiting on the mutex
+     * in case ndis does something unpredictable, e.g. calls our miniport halt independently
+     * from protocol unbind and concurrently with it*/
+    vboxNetFltRetain(pNetFlt, false);
+
+    rc = RTSemMutexRequest(pNetFlt->u.s.hWinIfMutex, RT_INDEFINITE_WAIT);
+    if (RT_SUCCESS(rc))
+    {
+        Assert(vboxNetFltWinGetWinIfState(pNetFlt) == kVBoxWinIfState_Connected);
+        Assert(vboxNetFltWinGetOpState(&pNetFlt->u.s.WinIf.MpState) == kVBoxNetDevOpState_Initialized);
+#ifndef VBOXNETADP
+        Assert(vboxNetFltWinGetOpState(&pNetFlt->u.s.WinIf.PtState) == kVBoxNetDevOpState_Initialized);
+#endif
+        if (vboxNetFltWinGetWinIfState(pNetFlt) == kVBoxWinIfState_Connected)
+        {
+            vboxNetFltWinSetWinIfState(pNetFlt, kVBoxWinIfState_Disconnecting);
+#ifndef VBOXNETADP
+            Status = vboxNetFltWinPtDoUnbinding(pNetFlt, bOnUnbind);
+#else
+            Status = vboxNetFltWinMpDoDeinitialization(pNetFlt);
+#endif
+            Assert(Status == NDIS_STATUS_SUCCESS);
+
+            vboxNetFltWinSetWinIfState(pNetFlt, kVBoxWinIfState_Disconnected);
+            Assert(vboxNetFltWinGetOpState(&pNetFlt->u.s.WinIf.MpState) == kVBoxNetDevOpState_Deinitialized);
+#ifndef VBOXNETADP
+            Assert(vboxNetFltWinGetOpState(&pNetFlt->u.s.WinIf.PtState) == kVBoxNetDevOpState_Deinitialized);
+#endif
+            vboxNetFltWinPtFiniWinIf(&pNetFlt->u.s.WinIf);
+
+            /* we're unbinding, make an unbind-related release */
+            vboxNetFltRelease(pNetFlt, false);
+        }
+        else
+        {
+            AssertBreakpoint();
+#ifndef VBOXNETADP
+            pNetFlt->u.s.WinIf.OpenCloseStatus = NDIS_STATUS_FAILURE;
+#endif
+            if (!bOnUnbind)
+            {
+                vboxNetFltWinSetOpState(&pNetFlt->u.s.WinIf.MpState, kVBoxNetDevOpState_Deinitialized);
+            }
+            Status = NDIS_STATUS_FAILURE;
+        }
+        RTSemMutexRelease(pNetFlt->u.s.hWinIfMutex);
+    }
+    else
+    {
+        AssertBreakpoint();
+        Status = NDIS_STATUS_FAILURE;
+    }
+
+    /* release for the retain we made before waining on the mutex */
+    vboxNetFltRelease(pNetFlt, false);
+
+    LogFlowFunc(("LEAVE: Status 0x%x\n", Status));
+
+    return Status;
+}
+
+
+/**
+ * Checks if the host (not us) has put the adapter in promiscuous mode.
+ *
+ * @returns true if promiscuous, false if not.
+ * @param   pThis               The instance.
+ */
+static bool vboxNetFltWinIsPromiscuous2(PVBOXNETFLTINS pThis)
+{
+#ifndef VBOXNETADP
+    if (VBOXNETFLT_PROMISCUOUS_SUPPORTED(pThis))
+    {
+        bool bPromiscuous;
+        if (!vboxNetFltWinReferenceWinIf(pThis))
+            return false;
+
+        bPromiscuous = (pThis->u.s.WinIf.fUpperProtocolSetFilter & NDIS_PACKET_TYPE_PROMISCUOUS) == NDIS_PACKET_TYPE_PROMISCUOUS;
+            /*vboxNetFltWinIsPromiscuous(pAdapt);*/
+
+        vboxNetFltWinDereferenceWinIf(pThis);
+        return bPromiscuous;
+    }
+    return false;
+#else
+    RT_NOREF1(pThis);
+    return true;
+#endif
+}
+
+
+/**
+ * Report the MAC address, promiscuous mode setting, GSO capabilities and
+ * no-preempt destinations to the internal network.
+ *
+ * Does nothing if we're not currently connected to an internal network.
+ *
+ * @param   pThis           The instance data.
+ */
+static void vboxNetFltWinReportStuff(PVBOXNETFLTINS pThis)
+{
+    /** @todo Keep these up to date, esp. the promiscuous mode bit. */
+    if (pThis->pSwitchPort
+        && vboxNetFltTryRetainBusyNotDisconnected(pThis))
+    {
+        pThis->pSwitchPort->pfnReportMacAddress(pThis->pSwitchPort, &pThis->u.s.MacAddr);
+        pThis->pSwitchPort->pfnReportPromiscuousMode(pThis->pSwitchPort,
+                                                     vboxNetFltWinIsPromiscuous2(pThis));
+        pThis->pSwitchPort->pfnReportGsoCapabilities(pThis->pSwitchPort, 0,
+                                                     INTNETTRUNKDIR_WIRE | INTNETTRUNKDIR_HOST);
+        /** @todo We should be able to do pfnXmit at DISPATCH_LEVEL... */
+        pThis->pSwitchPort->pfnReportNoPreemptDsts(pThis->pSwitchPort, 0 /* none */);
+        vboxNetFltRelease(pThis, true /*fBusy*/);
+    }
+}
+
+/**
+ * Worker for vboxNetFltWinAttachToInterface.
+ *
+ * @param   pAttachInfo     Structure for communicating with
+ *                          vboxNetFltWinAttachToInterface.
+ */
+static void vboxNetFltWinAttachToInterfaceWorker(PATTACH_INFO pAttachInfo)
+{
+    PVBOXNETFLTINS pThis = pAttachInfo->pNetFltIf;
+    NDIS_STATUS Status = NDIS_STATUS_SUCCESS;
+    int rc;
+
+    Assert(KeGetCurrentIrql() == PASSIVE_LEVEL);
+
+    /* to ensure we're not removed while we're here */
+    vboxNetFltRetain(pThis, false);
+
+    rc = RTSemMutexRequest(pThis->u.s.hWinIfMutex, RT_INDEFINITE_WAIT);
+    if (RT_SUCCESS(rc))
+    {
+        Assert(vboxNetFltWinGetWinIfState(pThis) == kVBoxWinIfState_Disconnected);
+        Assert(vboxNetFltWinGetOpState(&pThis->u.s.WinIf.MpState) == kVBoxNetDevOpState_Deinitialized);
+#ifndef VBOXNETADP
+        Assert(vboxNetFltWinGetOpState(&pThis->u.s.WinIf.PtState) == kVBoxNetDevOpState_Deinitialized);
+#endif
+        if (vboxNetFltWinGetWinIfState(pThis) == kVBoxWinIfState_Disconnected)
+        {
+            if (pAttachInfo->fRediscovery)
+            {
+                /* rediscovery means adaptor bind is performed while intnet is already using it
+                 * i.e. adaptor was unbound while being used by intnet and now being bound back again */
+                Assert(   ((VBOXNETFTLINSSTATE)ASMAtomicUoReadU32((uint32_t volatile *)&pThis->enmState))
+                       == kVBoxNetFltInsState_Connected);
+            }
+#ifndef VBOXNETADP
+            Status = vboxNetFltWinPtInitWinIf(&pThis->u.s.WinIf, pAttachInfo->pCreateContext->pOurName);
+#else
+            Status = vboxNetFltWinPtInitWinIf(&pThis->u.s.WinIf);
+#endif
+            if (Status == NDIS_STATUS_SUCCESS)
+            {
+                vboxNetFltWinSetWinIfState(pThis, kVBoxWinIfState_Connecting);
+
+#ifndef VBOXNETADP
+                Status = vboxNetFltWinPtDoBinding(pThis, pAttachInfo->pCreateContext->pOurName, pAttachInfo->pCreateContext->pBindToName);
+#else
+                Status = vboxNetFltWinMpDoInitialization(pThis, pAttachInfo->pCreateContext->hMiniportAdapter, pAttachInfo->pCreateContext->hWrapperConfigurationContext);
+#endif
+                if (Status == NDIS_STATUS_SUCCESS)
+                {
+                    if (!pAttachInfo->fRediscovery)
+                        vboxNetFltWinDrvReference();
+#ifndef VBOXNETADP
+                    if (pThis->u.s.WinIf.OpenCloseStatus == NDIS_STATUS_SUCCESS)
+#endif
+                    {
+                        vboxNetFltWinSetWinIfState(pThis, kVBoxWinIfState_Connected);
+#ifndef VBOXNETADP
+                        Assert(vboxNetFltWinGetOpState(&pThis->u.s.WinIf.PtState) == kVBoxNetDevOpState_Initialized);
+#endif
+                        /* 4. mark as connected */
+                        RTSpinlockAcquire(pThis->hSpinlock);
+                        ASMAtomicUoWriteBool(&pThis->fDisconnectedFromHost, false);
+                        RTSpinlockRelease(pThis->hSpinlock);
+
+                        pAttachInfo->Status = VINF_SUCCESS;
+                        pAttachInfo->pCreateContext->Status = NDIS_STATUS_SUCCESS;
+
+                        RTSemMutexRelease(pThis->u.s.hWinIfMutex);
+
+                        vboxNetFltRelease(pThis, false);
+
+                        /* 5. Report MAC address, promiscuousness and GSO capabilities. */
+                        vboxNetFltWinReportStuff(pThis);
+
+                        return;
+                    }
+#ifndef VBOXNETADP /* unreachable for VBOXNETADP because of the return above */
+                    AssertBreakpoint();
+
+                    if (!pAttachInfo->fRediscovery)
+                    {
+                        vboxNetFltWinDrvDereference();
+                    }
+# ifndef VBOXNETADP
+                    vboxNetFltWinPtDoUnbinding(pThis, true);
+/*# else - unreachable
+                    vboxNetFltWinMpDoDeinitialization(pThis); */
+# endif
+#endif
+                }
+                AssertBreakpoint();
+                vboxNetFltWinPtFiniWinIf(&pThis->u.s.WinIf);
+            }
+            AssertBreakpoint();
+            vboxNetFltWinSetWinIfState(pThis, kVBoxWinIfState_Disconnected);
+            Assert(vboxNetFltWinGetOpState(&pThis->u.s.WinIf.MpState) == kVBoxNetDevOpState_Deinitialized);
+#ifndef VBOXNETADP
+            Assert(vboxNetFltWinGetOpState(&pThis->u.s.WinIf.PtState) == kVBoxNetDevOpState_Deinitialized);
+#endif
+        }
+        AssertBreakpoint();
+
+        pAttachInfo->Status = VERR_GENERAL_FAILURE;
+        pAttachInfo->pCreateContext->Status = Status;
+        RTSemMutexRelease(pThis->u.s.hWinIfMutex);
+    }
+    else
+    {
+        AssertBreakpoint();
+        pAttachInfo->Status = rc;
+    }
+
+    vboxNetFltRelease(pThis, false);
+
+    return;
+}
+
+/**
+ * Common code for vboxNetFltOsInitInstance and
+ * vboxNetFltOsMaybeRediscovered.
+ *
+ * @returns IPRT status code.
+ * @param   pThis           The instance.
+ * @param   fRediscovery    True if vboxNetFltOsMaybeRediscovered is calling,
+ *                          false if it's vboxNetFltOsInitInstance.
+ */
+static int vboxNetFltWinAttachToInterface(PVBOXNETFLTINS pThis, void * pContext, bool fRediscovery)
+{
+    ATTACH_INFO Info;
+    Info.pNetFltIf = pThis;
+    Info.fRediscovery = fRediscovery;
+    Info.pCreateContext = (PCREATE_INSTANCE_CONTEXT)pContext;
+
+    vboxNetFltWinAttachToInterfaceWorker(&Info);
+
+    return Info.Status;
+}
+static NTSTATUS vboxNetFltWinPtDevDispatch(IN PDEVICE_OBJECT pDevObj, IN PIRP pIrp)
+{
+    RT_NOREF1(pDevObj);
+    PIO_STACK_LOCATION pIrpSl = IoGetCurrentIrpStackLocation(pIrp);;
+    NTSTATUS Status = STATUS_SUCCESS;
+
+    switch (pIrpSl->MajorFunction)
+    {
+        case IRP_MJ_DEVICE_CONTROL:
+            Status = STATUS_NOT_SUPPORTED;
+            break;
+        case IRP_MJ_CREATE:
+        case IRP_MJ_CLEANUP:
+        case IRP_MJ_CLOSE:
+            break;
+        default:
+            AssertFailed();
+            break;
+    }
+
+    pIrp->IoStatus.Status = Status;
+    IoCompleteRequest(pIrp, IO_NO_INCREMENT);
+
+    return Status;
+}
+
+static NDIS_STATUS vboxNetFltWinDevCreate(PVBOXNETFLTGLOBALS_WIN pGlobals)
+{
+    NDIS_STRING DevName, LinkName;
+    PDRIVER_DISPATCH aMajorFunctions[IRP_MJ_MAXIMUM_FUNCTION+1];
+    NdisInitUnicodeString(&DevName, VBOXNETFLT_NAME_DEVICE);
+    NdisInitUnicodeString(&LinkName, VBOXNETFLT_NAME_LINK);
+
+    Assert(!pGlobals->hDevice);
+    Assert(!pGlobals->pDevObj);
+    NdisZeroMemory(aMajorFunctions, sizeof (aMajorFunctions));
+    aMajorFunctions[IRP_MJ_CREATE] = vboxNetFltWinPtDevDispatch;
+    aMajorFunctions[IRP_MJ_CLEANUP] = vboxNetFltWinPtDevDispatch;
+    aMajorFunctions[IRP_MJ_CLOSE] = vboxNetFltWinPtDevDispatch;
+    aMajorFunctions[IRP_MJ_DEVICE_CONTROL] = vboxNetFltWinPtDevDispatch;
+
+    NDIS_STATUS Status = NdisMRegisterDevice(pGlobals->Mp.hNdisWrapper,
+              &DevName, &LinkName,
+              aMajorFunctions,
+              &pGlobals->pDevObj,
+              &pGlobals->hDevice);
+    Assert(Status == NDIS_STATUS_SUCCESS);
+    return Status;
+}
+
+static NDIS_STATUS vboxNetFltWinDevDestroy(PVBOXNETFLTGLOBALS_WIN pGlobals)
+{
+    Assert(pGlobals->hDevice);
+    Assert(pGlobals->pDevObj);
+    NDIS_STATUS Status = NdisMDeregisterDevice(pGlobals->hDevice);
+    Assert(Status == NDIS_STATUS_SUCCESS);
+    if (Status == NDIS_STATUS_SUCCESS)
+    {
+        pGlobals->hDevice = NULL;
+        pGlobals->pDevObj = NULL;
+    }
+    return Status;
+}
+
+static NDIS_STATUS vboxNetFltWinDevCreateReference(PVBOXNETFLTGLOBALS_WIN pGlobals)
+{
+    Assert(KeGetCurrentIrql() == PASSIVE_LEVEL);
+    NDIS_STATUS Status = KeWaitForSingleObject(&pGlobals->SynchEvent, Executive, KernelMode, FALSE, NULL);
+    Assert(Status == STATUS_SUCCESS);
+    if (Status == STATUS_SUCCESS)
+    {
+        Assert(pGlobals->cDeviceRefs >= 0);
+        if (++pGlobals->cDeviceRefs == 1)
+        {
+            Status = vboxNetFltWinDevCreate(pGlobals);
+            if (Status == NDIS_STATUS_SUCCESS)
+            {
+                ObReferenceObject(pGlobals->pDevObj);
+            }
+        }
+        else
+        {
+            Status = NDIS_STATUS_SUCCESS;
+        }
+        KeSetEvent(&pGlobals->SynchEvent, 0, FALSE);
+    }
+    else
+    {
+        /* should never happen actually */
+        AssertFailed();
+        Status = NDIS_STATUS_FAILURE;
+    }
+    return Status;
+}
+
+static NDIS_STATUS vboxNetFltWinDevDereference(PVBOXNETFLTGLOBALS_WIN pGlobals)
+{
+    Assert(KeGetCurrentIrql() == PASSIVE_LEVEL);
+    NDIS_STATUS Status = KeWaitForSingleObject(&pGlobals->SynchEvent, Executive, KernelMode, FALSE, NULL);
+    Assert(Status == STATUS_SUCCESS);
+    if (Status == STATUS_SUCCESS)
+    {
+        Assert(pGlobals->cDeviceRefs > 0);
+        if (!(--pGlobals->cDeviceRefs))
+        {
+            ObDereferenceObject(pGlobals->pDevObj);
+            Status = vboxNetFltWinDevDestroy(pGlobals);
+        }
+        else
+        {
+            Status = NDIS_STATUS_SUCCESS;
+        }
+        KeSetEvent(&pGlobals->SynchEvent, 0, FALSE);
+    }
+    else
+    {
+        /* should never happen actually */
+        AssertFailed();
+        Status = NDIS_STATUS_FAILURE;
+    }
+    return Status;
+}
+
+/* reference the driver module to prevent driver unload */
+DECLHIDDEN(void) vboxNetFltWinDrvReference()
+{
+    vboxNetFltWinDevCreateReference(&g_VBoxNetFltGlobalsWin);
+}
+
+/* dereference the driver module to prevent driver unload */
+DECLHIDDEN(void) vboxNetFltWinDrvDereference()
+{
+    vboxNetFltWinDevDereference(&g_VBoxNetFltGlobalsWin);
+}
+
+/*
+ *
+ * The OS specific interface definition
+ *
+ */
+
+
+bool vboxNetFltOsMaybeRediscovered(PVBOXNETFLTINS pThis)
+{
+    /* AttachToInterface true if disconnected */
+    return !ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost);
+}
+
+int vboxNetFltPortOsXmit(PVBOXNETFLTINS pThis, void *pvIfData, PINTNETSG pSG, uint32_t fDst)
+{
+    RT_NOREF1(pvIfData);
+    int rc = VINF_SUCCESS;
+    uint32_t cRefs = 0;
+#ifndef VBOXNETADP
+    if (fDst & INTNETTRUNKDIR_WIRE)
+        cRefs++;
+    if (fDst & INTNETTRUNKDIR_HOST)
+        cRefs++;
+#else
+    if ((fDst & INTNETTRUNKDIR_WIRE) || (fDst & INTNETTRUNKDIR_HOST))
+        cRefs = 1;
+#endif
+
+    AssertReturn(cRefs, VINF_SUCCESS);
+
+    if (!vboxNetFltWinIncReferenceWinIf(pThis, cRefs))
+    {
+        return VERR_GENERAL_FAILURE;
+    }
+#ifndef VBOXNETADP
+    if (fDst & INTNETTRUNKDIR_WIRE)
+    {
+        PNDIS_PACKET pPacket;
+
+        pPacket = vboxNetFltWinNdisPacketFromSG(pThis, pSG, NULL /*pBufToFree*/,
+                                                true /*fToWire*/, true /*fCopyMemory*/);
+
+        if (pPacket)
+        {
+            NDIS_STATUS fStatus;
+
+#ifndef VBOX_LOOPBACK_USEFLAGS
+            /* force "don't loopback" flags to prevent loopback branch invocation in any case
+             * to avoid ndis misbehave */
+            NdisGetPacketFlags(pPacket) |= g_VBoxNetFltGlobalsWin.fPacketDontLoopBack;
+#else
+            /* this is done by default in vboxNetFltWinNdisPacketFromSG */
+#endif
+
+#if defined(DEBUG_NETFLT_PACKETS) || !defined(VBOX_LOOPBACK_USEFLAGS)
+            vboxNetFltWinLbPutSendPacket(pThis, pPacket, true /* bFromIntNet */);
+#endif
+            NdisSend(&fStatus, pThis->u.s.WinIf.hBinding, pPacket);
+            if (fStatus != NDIS_STATUS_PENDING)
+            {
+#if defined(DEBUG_NETFLT_PACKETS) || !defined(VBOX_LOOPBACK_USEFLAGS)
+                /* the status is NOT pending, complete the packet */
+                bool fTmp = vboxNetFltWinLbRemoveSendPacket(pThis, pPacket);
+                Assert(fTmp); NOREF(fTmp);
+#endif
+                if (!NT_SUCCESS(fStatus))
+                    rc = VERR_GENERAL_FAILURE; /** @todo convert status to VERR_xxx */
+
+                vboxNetFltWinFreeSGNdisPacket(pPacket, true);
+            }
+            else
+            {
+                /* pending, dereference on packet complete */
+                cRefs--;
+            }
+        }
+        else
+        {
+            AssertFailed();
+            rc = VERR_NO_MEMORY;
+        }
+    }
+#endif
+
+#ifndef VBOXNETADP
+    if (fDst & INTNETTRUNKDIR_HOST)
+#else
+    if (cRefs)
+#endif
+    {
+        PNDIS_PACKET pPacket = vboxNetFltWinNdisPacketFromSG(pThis, pSG, NULL /*pBufToFree*/,
+                                                             false /*fToWire*/, true /*fCopyMemory*/);
+        if (pPacket)
+        {
+            NdisMIndicateReceivePacket(pThis->u.s.WinIf.hMiniport, &pPacket, 1);
+            cRefs--;
+#ifdef VBOXNETADP
+            STATISTIC_INCREASE(pThis->u.s.WinIf.cRxSuccess);
+#endif
+        }
+        else
+        {
+            AssertFailed();
+#ifdef VBOXNETADP
+            STATISTIC_INCREASE(pThis->u.s.WinIf.cRxError);
+#endif
+            rc = VERR_NO_MEMORY;
+        }
+    }
+
+    Assert(cRefs <= 2);
+
+    if (cRefs)
+    {
+        vboxNetFltWinDecReferenceWinIf(pThis, cRefs);
+    }
+
+    return rc;
+}
+
+void vboxNetFltPortOsSetActive(PVBOXNETFLTINS pThis, bool fActive)
+{
+#ifndef VBOXNETADP
+    NDIS_STATUS Status;
+#endif
+    /* we first wait for all pending ops to complete
+     * this might include all packets queued for processing */
+    for (;;)
+    {
+        if (fActive)
+        {
+            if (!pThis->u.s.cModePassThruRefs)
+            {
+                break;
+            }
+        }
+        else
+        {
+            if (!pThis->u.s.cModeNetFltRefs)
+            {
+                break;
+            }
+        }
+        vboxNetFltWinSleep(2);
+    }
+
+    if (!vboxNetFltWinReferenceWinIf(pThis))
+        return;
+#ifndef VBOXNETADP
+
+    if (fActive)
+    {
+#ifdef DEBUG_misha
+        NDIS_PHYSICAL_MEDIUM PhMedium;
+        bool bPromiscSupported;
+
+        Status = vboxNetFltWinQueryPhysicalMedium(pThis, &PhMedium);
+        if (Status != NDIS_STATUS_SUCCESS)
+        {
+
+            LogRel(("vboxNetFltWinQueryPhysicalMedium failed, Status (0x%x), setting medium to NdisPhysicalMediumUnspecified\n", Status));
+            Assert(Status == NDIS_STATUS_NOT_SUPPORTED);
+            if (Status != NDIS_STATUS_NOT_SUPPORTED)
+            {
+                LogRel(("vboxNetFltWinQueryPhysicalMedium failed, Status (0x%x), setting medium to NdisPhysicalMediumUnspecified\n", Status));
+            }
+            PhMedium = NdisPhysicalMediumUnspecified;
+        }
+        else
+        {
+            LogRel(("(SUCCESS) vboxNetFltWinQueryPhysicalMedium SUCCESS\n"));
+        }
+
+        bPromiscSupported = (!(PhMedium == NdisPhysicalMediumWirelessWan
+                        || PhMedium == NdisPhysicalMediumWirelessLan
+                        || PhMedium == NdisPhysicalMediumNative802_11
+                        || PhMedium == NdisPhysicalMediumBluetooth
+                        /*|| PhMedium == NdisPhysicalMediumWiMax */
+                        ));
+
+        Assert(bPromiscSupported == VBOXNETFLT_PROMISCUOUS_SUPPORTED(pThis));
+#endif
+    }
+
+    if (VBOXNETFLT_PROMISCUOUS_SUPPORTED(pThis))
+    {
+        Status = vboxNetFltWinSetPromiscuous(pThis, fActive);
+        if (Status != NDIS_STATUS_SUCCESS)
+        {
+            LogRel(("vboxNetFltWinSetPromiscuous failed, Status (0x%x), fActive (%d)\n", Status, fActive));
+            AssertFailed();
+        }
+    }
+#else
+# ifdef VBOXNETADP_REPORT_DISCONNECTED
+    if (fActive)
+    {
+        NdisMIndicateStatus(pThis->u.s.WinIf.hMiniport,
+                                 NDIS_STATUS_MEDIA_CONNECT,
+                                 (PVOID)NULL,
+                                 0);
+    }
+    else
+    {
+        NdisMIndicateStatus(pThis->u.s.WinIf.hMiniport,
+                                 NDIS_STATUS_MEDIA_DISCONNECT,
+                                 (PVOID)NULL,
+                                 0);
+    }
+#else
+    if (fActive)
+    {
+        /* indicate status change to make the ip settings be re-picked for dhcp */
+        NdisMIndicateStatus(pThis->u.s.WinIf.hMiniport,
+                                 NDIS_STATUS_MEDIA_DISCONNECT,
+                                 (PVOID)NULL,
+                                 0);
+
+        NdisMIndicateStatus(pThis->u.s.WinIf.hMiniport,
+                                 NDIS_STATUS_MEDIA_CONNECT,
+                                 (PVOID)NULL,
+                                 0);
+    }
+# endif
+#endif
+    vboxNetFltWinDereferenceWinIf(pThis);
+
+    return;
+}
+
+#ifndef VBOXNETADP
+
+DECLINLINE(bool) vboxNetFltWinIsAddrLinkLocal4(PCRTNETADDRIPV4 pAddr)
+{
+    return (pAddr->s.Lo == 0xfea9); /* 169.254 */
+}
+
+DECLINLINE(bool) vboxNetFltWinIsAddrLinkLocal6(PCRTNETADDRIPV6 pAddr)
+{
+    return ((pAddr->au8[0] == 0xfe) && ((pAddr->au8[1] & 0xc0) == 0x80));
+}
+
+void vboxNetFltWinNotifyHostAddress(PTA_ADDRESS pAddress, bool fAdded)
+{
+    void *pvAddr = NULL;
+    INTNETADDRTYPE enmAddrType = kIntNetAddrType_Invalid;
+
+    LogFlow(("==>vboxNetFltWinNotifyHostAddress: AddrType=%d %s\n",
+             pAddress->AddressType, fAdded ? "added" : "deleted"));
+    if (pAddress->AddressType == TDI_ADDRESS_TYPE_IP)
+    {
+        PTDI_ADDRESS_IP pTdiAddrIp = (PTDI_ADDRESS_IP)pAddress->Address;
+        /*
+         * Note that we do not get loopback addresses here. If we did we should
+         * have checked and ignored them too.
+         */
+        if (!vboxNetFltWinIsAddrLinkLocal4((PCRTNETADDRIPV4)(&pTdiAddrIp->in_addr)))
+        {
+            pvAddr = &pTdiAddrIp->in_addr;
+            enmAddrType = kIntNetAddrType_IPv4;
+        }
+        else
+            Log2(("vboxNetFltWinNotifyHostAddress: ignoring link-local address %RTnaipv4\n",
+                  pTdiAddrIp->in_addr));
+    }
+    else if (pAddress->AddressType == TDI_ADDRESS_TYPE_IP6)
+    {
+        PTDI_ADDRESS_IP6 pTdiAddrIp6 = (PTDI_ADDRESS_IP6)pAddress->Address;
+        if (!vboxNetFltWinIsAddrLinkLocal6((PCRTNETADDRIPV6)(pTdiAddrIp6->sin6_addr)))
+        {
+            pvAddr = pTdiAddrIp6->sin6_addr;
+            enmAddrType = kIntNetAddrType_IPv6;
+        }
+        else
+            Log2(("vboxNetFltWinNotifyHostAddress: ignoring link-local address %RTnaipv6\n",
+                  pTdiAddrIp6->sin6_addr));
+    }
+    else
+    {
+        Log2(("vboxNetFltWinNotifyHostAddress: ignoring irrelevant address type %d\n",
+              pAddress->AddressType));
+        LogFlow(("<==vboxNetFltWinNotifyHostAddress\n"));
+        return;
+    }
+    if (pvAddr)
+    {
+        NdisAcquireSpinLock(&g_VBoxNetFltGlobalsWin.lockFilters);
+        /* At this point the list must contain at least one element. */
+        PVBOXNETFLTINS pInstance = NULL;
+        PVBOXNETFLTWIN pFilter;
+        RTListForEach(&g_VBoxNetFltGlobalsWin.listFilters, pFilter, VBOXNETFLTWIN, node)
+        {
+            pInstance = RT_FROM_MEMBER(pFilter, VBOXNETFLTINS, u.s.WinIf);
+            if (vboxNetFltWinReferenceWinIf(pInstance))
+            {
+                if (pInstance->pSwitchPort && pInstance->pSwitchPort->pfnNotifyHostAddress)
+                    break;
+                vboxNetFltWinDereferenceWinIf(pInstance);
+            }
+            else
+                Log2(("vboxNetFltWinNotifyHostAddress: failed to retain filter instance %p\n", pInstance));
+            pInstance = NULL;
+        }
+        NdisReleaseSpinLock(&g_VBoxNetFltGlobalsWin.lockFilters);
+        if (pInstance)
+        {
+            if (enmAddrType == kIntNetAddrType_IPv4)
+                Log2(("vboxNetFltWin%sAddressHandler: %RTnaipv4\n",
+                      fAdded ? "Add" : "Del", *(PCRTNETADDRIPV4)pvAddr));
+            else
+                Log2(("vboxNetFltWin%sAddressHandler: %RTnaipv6\n",
+                      fAdded ? "Add" : "Del", pvAddr));
+            pInstance->pSwitchPort->pfnNotifyHostAddress(pInstance->pSwitchPort, fAdded,
+                                                         enmAddrType, pvAddr);
+            vboxNetFltWinDereferenceWinIf(pInstance);
+        }
+        else
+            Log2(("vboxNetFltWinNotifyHostAddress: no filters require notification\n"));
+    }
+    LogFlow(("<==vboxNetFltWinNotifyHostAddress\n"));
+}
+
+void vboxNetFltWinAddAddressHandler(PTA_ADDRESS Address,
+                                    PUNICODE_STRING DeviceName,
+                                    PTDI_PNP_CONTEXT Context)
+{
+    RT_NOREF2(DeviceName, Context);
+    vboxNetFltWinNotifyHostAddress(Address, true);
+}
+
+void vboxNetFltWinDelAddressHandler(PTA_ADDRESS Address,
+                                    PUNICODE_STRING DeviceName,
+                                    PTDI_PNP_CONTEXT Context)
+{
+    RT_NOREF2(DeviceName, Context);
+    vboxNetFltWinNotifyHostAddress(Address, false);
+}
+
+void vboxNetFltWinRegisterIpAddrNotifier(PVBOXNETFLTINS pThis)
+{
+    LogFlow(("==>vboxNetFltWinRegisterIpAddrNotifier: instance=%p pThis->pSwitchPort=%p pThis->pSwitchPort->pfnNotifyHostAddress=%p\n",
+             pThis, pThis->pSwitchPort, pThis->pSwitchPort ? pThis->pSwitchPort->pfnNotifyHostAddress : NULL));
+    if (pThis->pSwitchPort && pThis->pSwitchPort->pfnNotifyHostAddress)
+    {
+        NdisAcquireSpinLock(&g_VBoxNetFltGlobalsWin.lockFilters);
+        bool fRegisterHandlers = RTListIsEmpty(&g_VBoxNetFltGlobalsWin.listFilters);
+        RTListPrepend(&g_VBoxNetFltGlobalsWin.listFilters, &pThis->u.s.WinIf.node);
+        NdisReleaseSpinLock(&g_VBoxNetFltGlobalsWin.lockFilters);
+
+        if (fRegisterHandlers)
+        {
+            TDI_CLIENT_INTERFACE_INFO Info;
+            UNICODE_STRING ClientName = RTL_CONSTANT_STRING(L"VBoxNetFlt");
+            memset(&Info, 0, sizeof(Info));
+            Info.MajorTdiVersion = 2;
+            Info.MinorTdiVersion = 0;
+            Info.ClientName = &ClientName;
+            Info.AddAddressHandlerV2 = vboxNetFltWinAddAddressHandler;
+            Info.DelAddressHandlerV2 = vboxNetFltWinDelAddressHandler;
+            Assert(!g_VBoxNetFltGlobalsWin.hNotifier);
+            NTSTATUS Status = TdiRegisterPnPHandlers(&Info, sizeof(Info), &g_VBoxNetFltGlobalsWin.hNotifier);
+            Log2(("vboxNetFltWinRegisterIpAddrNotifier: TdiRegisterPnPHandlers returned %d\n", Status)); NOREF(Status);
+        }
+        else
+            Log2(("vboxNetFltWinRegisterIpAddrNotifier: already registed\n"));
+    }
+    else
+        Log2(("vboxNetFltWinRegisterIpAddrNotifier: this instance does not require notifications, ignoring...\n"));
+    LogFlow(("<==vboxNetFltWinRegisterIpAddrNotifier: notifier=%p\n", g_VBoxNetFltGlobalsWin.hNotifier));
+}
+
+void vboxNetFltWinUnregisterIpAddrNotifier(PVBOXNETFLTINS pThis)
+{
+    LogFlow(("==>vboxNetFltWinUnregisterIpAddrNotifier: notifier=%p\n", g_VBoxNetFltGlobalsWin.hNotifier));
+    if (pThis->pSwitchPort && pThis->pSwitchPort->pfnNotifyHostAddress)
+    {
+        NdisAcquireSpinLock(&g_VBoxNetFltGlobalsWin.lockFilters);
+        /* At this point the list must contain at least one element. */
+        Assert(!RTListIsEmpty(&g_VBoxNetFltGlobalsWin.listFilters));
+        RTListNodeRemove(&pThis->u.s.WinIf.node);
+        HANDLE hNotifier = NULL;
+        if (RTListIsEmpty(&g_VBoxNetFltGlobalsWin.listFilters))
+        {
+            /*
+             * The list has become empty, so we need to deregister handlers. We
+             * grab hNotifier and reset it while still holding the lock. This
+             * guaranties that we won't interfere with setting it in
+             * vboxNetFltWinRegisterIpAddrNotifier(). It is inconceivable that
+             * vboxNetFltWinUnregisterIpAddrNotifier() will be called for the
+             * same filter instance while it is still being processed by
+             * vboxNetFltWinRegisterIpAddrNotifier(). This would require trunk
+             * destruction in the middle of its creation. It is possible that
+             * vboxNetFltWinUnregisterIpAddrNotifier() is called for another
+             * filter instance, but in such case we won't even get here as the
+             * list won't be empty.
+             */
+            hNotifier = g_VBoxNetFltGlobalsWin.hNotifier;
+            g_VBoxNetFltGlobalsWin.hNotifier = NULL;
+        }
+        NdisReleaseSpinLock(&g_VBoxNetFltGlobalsWin.lockFilters);
+        if (hNotifier)
+        {
+            NTSTATUS Status = TdiDeregisterPnPHandlers(hNotifier);
+            Log2(("vboxNetFltWinUnregisterIpAddrNotifier: TdiDeregisterPnPHandlers(%p) returned %d\n",
+                  hNotifier, Status)); NOREF(Status);
+        }
+        else
+            Log2(("vboxNetFltWinUnregisterIpAddrNotifier: filters remain, do not deregister handlers yet\n"));
+    }
+    else
+        Log2(("vboxNetFltWinUnregisterIpAddrNotifier: this instance did not require notifications, ignoring...\n"));
+    LogFlow(("<==vboxNetFltWinUnregisterIpAddrNotifier\n"));
+}
+#else /* VBOXNETADP */
+#define vboxNetFltWinRegisterIpAddrNotifier(x)
+#define vboxNetFltWinUnregisterIpAddrNotifier(x)
+#endif /* VBOXNETADP */
+
+int vboxNetFltOsDisconnectIt(PVBOXNETFLTINS pThis)
+{
+    NDIS_STATUS Status = vboxNetFltWinDisconnectIt(pThis);
+    Log2(("vboxNetFltOsDisconnectIt: pThis=%p pThis->pSwitchPort=%p pThis->pSwitchPort->pfnNotifyHostAddress=%p\n",
+          pThis, pThis->pSwitchPort, pThis->pSwitchPort ? pThis->pSwitchPort->pfnNotifyHostAddress : NULL));
+    vboxNetFltWinUnregisterIpAddrNotifier(pThis);
+    return Status == NDIS_STATUS_SUCCESS ? VINF_SUCCESS : VERR_GENERAL_FAILURE;
+}
+
+static void vboxNetFltWinConnectItWorker(PVOID pvContext)
+{
+    PWORKER_INFO pInfo = (PWORKER_INFO)pvContext;
+#if !defined(VBOXNETADP) || !defined(VBOXNETFLT_NO_PACKET_QUEUE)
+    NDIS_STATUS Status;
+#endif
+    PVBOXNETFLTINS pInstance = pInfo->pNetFltIf;
+
+    Assert(KeGetCurrentIrql() == PASSIVE_LEVEL);
+
+    /* this is not a rediscovery, initialize Mac cache */
+    if (vboxNetFltWinReferenceWinIf(pInstance))
+    {
+#ifndef VBOXNETADP
+        Status = vboxNetFltWinGetMacAddress(pInstance, &pInstance->u.s.MacAddr);
+        if (Status == NDIS_STATUS_SUCCESS)
+#endif
+        {
+#ifdef VBOXNETFLT_NO_PACKET_QUEUE
+            pInfo->Status = VINF_SUCCESS;
+#else
+            Status = vboxNetFltWinQuInitPacketQueue(pInstance);
+            if (Status == NDIS_STATUS_SUCCESS)
+            {
+                pInfo->Status = VINF_SUCCESS;
+            }
+            else
+            {
+                pInfo->Status = VERR_GENERAL_FAILURE;
+            }
+#endif
+        }
+#ifndef VBOXNETADP
+        else
+        {
+            pInfo->Status = VERR_INTNET_FLT_IF_FAILED;
+        }
+#endif
+
+        vboxNetFltWinDereferenceWinIf(pInstance);
+    }
+    else
+    {
+        pInfo->Status = VERR_INTNET_FLT_IF_NOT_FOUND;
+    }
+}
+
+static int vboxNetFltWinConnectIt(PVBOXNETFLTINS pThis)
+{
+    WORKER_INFO Info;
+    Info.pNetFltIf = pThis;
+
+    vboxNetFltWinJobSynchExecAtPassive(vboxNetFltWinConnectItWorker, &Info);
+
+    if (RT_SUCCESS(Info.Status))
+        vboxNetFltWinReportStuff(pThis);
+
+    return Info.Status;
+}
+
+int vboxNetFltOsConnectIt(PVBOXNETFLTINS pThis)
+{
+    Log2(("vboxNetFltOsConnectIt: pThis=%p pThis->pSwitchPort=%p pThis->pSwitchPort->pfnNotifyHostAddress=%p\n",
+          pThis, pThis->pSwitchPort, pThis->pSwitchPort ? pThis->pSwitchPort->pfnNotifyHostAddress : NULL));
+    vboxNetFltWinRegisterIpAddrNotifier(pThis);
+    return vboxNetFltWinConnectIt(pThis);
+}
+
+void vboxNetFltOsDeleteInstance(PVBOXNETFLTINS pThis)
+{
+    vboxNetFltWinDeleteInstance(pThis);
+}
+
+int vboxNetFltOsInitInstance(PVBOXNETFLTINS pThis, void *pvContext)
+{
+    int rc = RTSemMutexCreate(&pThis->u.s.hWinIfMutex);
+    if (RT_SUCCESS(rc))
+    {
+        rc = vboxNetFltWinAttachToInterface(pThis, pvContext, false /*fRediscovery*/ );
+        if (RT_SUCCESS(rc))
+        {
+            return rc;
+        }
+        RTSemMutexDestroy(pThis->u.s.hWinIfMutex);
+    }
+    return rc;
+}
+
+int vboxNetFltOsPreInitInstance(PVBOXNETFLTINS pThis)
+{
+    pThis->u.s.cModeNetFltRefs = 0;
+    pThis->u.s.cModePassThruRefs = 0;
+    vboxNetFltWinSetWinIfState(pThis, kVBoxWinIfState_Disconnected);
+    vboxNetFltWinSetOpState(&pThis->u.s.WinIf.MpState, kVBoxNetDevOpState_Deinitialized);
+#ifndef VBOXNETADP
+    vboxNetFltWinSetOpState(&pThis->u.s.WinIf.PtState, kVBoxNetDevOpState_Deinitialized);
+#endif
+    return VINF_SUCCESS;
+}
+
+void vboxNetFltPortOsNotifyMacAddress(PVBOXNETFLTINS pThis, void *pvIfData, PCRTMAC pMac)
+{
+    RT_NOREF3(pThis, pvIfData, pMac);
+}
+
+int vboxNetFltPortOsConnectInterface(PVBOXNETFLTINS pThis, void *pvIf, void **ppvIfData)
+{
+    /* Nothing to do */
+    RT_NOREF3(pThis, pvIf, ppvIfData);
+    return VINF_SUCCESS;
+}
+
+int vboxNetFltPortOsDisconnectInterface(PVBOXNETFLTINS pThis, void *pvIfData)
+{
+    /* Nothing to do */
+    RT_NOREF2(pThis, pvIfData);
+    return VINF_SUCCESS;
+}
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFltRt-win.h b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFltRt-win.h
new file mode 100644
index 00000000..d878271a
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetFltRt-win.h
@@ -0,0 +1,962 @@
+/* $Id: VBoxNetFltRt-win.h $ */
+/** @file
+ * VBoxNetFltRt-win.h - Bridged Networking Driver, Windows Specific Code.
+ * NetFlt Runtime API
+ */
+/*
+ * Copyright (C) 2011-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#ifndef VBOX_INCLUDED_SRC_VBoxNetFlt_win_drv_VBoxNetFltRt_win_h
+#define VBOX_INCLUDED_SRC_VBoxNetFlt_win_drv_VBoxNetFltRt_win_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+DECLHIDDEN(VOID) vboxNetFltWinUnload(IN PDRIVER_OBJECT DriverObject);
+
+#ifndef VBOXNETADP
+# if !defined(VBOX_LOOPBACK_USEFLAGS) || defined(DEBUG_NETFLT_PACKETS)
+DECLHIDDEN(bool) vboxNetFltWinMatchPackets(PNDIS_PACKET pPacket1, PNDIS_PACKET pPacket2, const INT cbMatch);
+DECLHIDDEN(bool) vboxNetFltWinMatchPacketAndSG(PNDIS_PACKET pPacket, PINTNETSG pSG, const INT cbMatch);
+# endif
+#endif
+
+/*************************
+ * packet queue API      *
+ *************************/
+
+
+#define LIST_ENTRY_2_PACKET_INFO(pListEntry) \
+    ( (PVBOXNETFLT_PACKET_INFO)((uint8_t *)(pListEntry) - RT_UOFFSETOF(VBOXNETFLT_PACKET_INFO, ListEntry)) )
+
+#if !defined(VBOX_LOOPBACK_USEFLAGS) || defined(DEBUG_NETFLT_PACKETS)
+
+#define VBOX_SLE_2_PKTRSVD_PT(_pEntry) \
+    ( (PVBOXNETFLT_PKTRSVD_PT)((uint8_t *)(_pEntry) - RT_UOFFSETOF(VBOXNETFLT_PKTRSVD_PT, ListEntry)) )
+
+#define VBOX_SLE_2_SENDPACKET(_pEntry) \
+    ( (PNDIS_PACKET)((uint8_t *)(VBOX_SLE_2_PKTRSVD_PT(_pEntry)) - RT_UOFFSETOF(NDIS_PACKET, ProtocolReserved)) )
+
+#endif
+/**
+ * enqueus the packet info to the tail of the queue
+ */
+DECLINLINE(void) vboxNetFltWinQuEnqueueTail(PVBOXNETFLT_PACKET_QUEUE pQueue, PVBOXNETFLT_PACKET_INFO pPacketInfo)
+{
+    InsertTailList(pQueue, &pPacketInfo->ListEntry);
+}
+
+DECLINLINE(void) vboxNetFltWinQuEnqueueHead(PVBOXNETFLT_PACKET_QUEUE pQueue, PVBOXNETFLT_PACKET_INFO pPacketInfo)
+{
+    Assert(pPacketInfo->pPool);
+    InsertHeadList(pQueue, &pPacketInfo->ListEntry);
+}
+
+/**
+ * enqueus the packet info to the tail of the queue
+ */
+DECLINLINE(void) vboxNetFltWinQuInterlockedEnqueueTail(PVBOXNETFLT_INTERLOCKED_PACKET_QUEUE pQueue, PVBOXNETFLT_PACKET_INFO pPacketInfo)
+{
+    Assert(pPacketInfo->pPool);
+    NdisAcquireSpinLock(&pQueue->Lock);
+    vboxNetFltWinQuEnqueueTail(&pQueue->Queue, pPacketInfo);
+    NdisReleaseSpinLock(&pQueue->Lock);
+}
+
+DECLINLINE(void) vboxNetFltWinQuInterlockedEnqueueHead(PVBOXNETFLT_INTERLOCKED_PACKET_QUEUE pQueue, PVBOXNETFLT_PACKET_INFO pPacketInfo)
+{
+    NdisAcquireSpinLock(&pQueue->Lock);
+    vboxNetFltWinQuEnqueueHead(&pQueue->Queue, pPacketInfo);
+    NdisReleaseSpinLock(&pQueue->Lock);
+}
+
+/**
+ * dequeus the packet info from the head of the queue
+ */
+DECLINLINE(PVBOXNETFLT_PACKET_INFO) vboxNetFltWinQuDequeueHead(PVBOXNETFLT_PACKET_QUEUE pQueue)
+{
+    PLIST_ENTRY pListEntry = RemoveHeadList(pQueue);
+    if (pListEntry != pQueue)
+    {
+        PVBOXNETFLT_PACKET_INFO pInfo = LIST_ENTRY_2_PACKET_INFO(pListEntry);
+        Assert(pInfo->pPool);
+        return pInfo;
+    }
+    return NULL;
+}
+
+DECLINLINE(PVBOXNETFLT_PACKET_INFO) vboxNetFltWinQuDequeueTail(PVBOXNETFLT_PACKET_QUEUE pQueue)
+{
+    PLIST_ENTRY pListEntry = RemoveTailList(pQueue);
+    if (pListEntry != pQueue)
+    {
+        PVBOXNETFLT_PACKET_INFO pInfo = LIST_ENTRY_2_PACKET_INFO(pListEntry);
+        Assert(pInfo->pPool);
+        return pInfo;
+    }
+    return NULL;
+}
+
+DECLINLINE(PVBOXNETFLT_PACKET_INFO) vboxNetFltWinQuInterlockedDequeueHead(PVBOXNETFLT_INTERLOCKED_PACKET_QUEUE pInterlockedQueue)
+{
+    PVBOXNETFLT_PACKET_INFO pInfo;
+    NdisAcquireSpinLock(&pInterlockedQueue->Lock);
+    pInfo = vboxNetFltWinQuDequeueHead(&pInterlockedQueue->Queue);
+    NdisReleaseSpinLock(&pInterlockedQueue->Lock);
+    return pInfo;
+}
+
+DECLINLINE(PVBOXNETFLT_PACKET_INFO) vboxNetFltWinQuInterlockedDequeueTail(PVBOXNETFLT_INTERLOCKED_PACKET_QUEUE pInterlockedQueue)
+{
+    PVBOXNETFLT_PACKET_INFO pInfo;
+    NdisAcquireSpinLock(&pInterlockedQueue->Lock);
+    pInfo = vboxNetFltWinQuDequeueTail(&pInterlockedQueue->Queue);
+    NdisReleaseSpinLock(&pInterlockedQueue->Lock);
+    return pInfo;
+}
+
+DECLINLINE(void) vboxNetFltWinQuDequeue(PVBOXNETFLT_PACKET_INFO pInfo)
+{
+    RemoveEntryList(&pInfo->ListEntry);
+}
+
+DECLINLINE(void) vboxNetFltWinQuInterlockedDequeue(PVBOXNETFLT_INTERLOCKED_PACKET_QUEUE pInterlockedQueue, PVBOXNETFLT_PACKET_INFO pInfo)
+{
+    NdisAcquireSpinLock(&pInterlockedQueue->Lock);
+    vboxNetFltWinQuDequeue(pInfo);
+    NdisReleaseSpinLock(&pInterlockedQueue->Lock);
+}
+
+/**
+ * allocates the packet info from the pool
+ */
+DECLINLINE(PVBOXNETFLT_PACKET_INFO) vboxNetFltWinPpAllocPacketInfo(PVBOXNETFLT_PACKET_INFO_POOL pPool)
+{
+    return vboxNetFltWinQuInterlockedDequeueHead(&pPool->Queue);
+}
+
+/**
+ * returns the packet info to the pool
+ */
+DECLINLINE(void) vboxNetFltWinPpFreePacketInfo(PVBOXNETFLT_PACKET_INFO pInfo)
+{
+    PVBOXNETFLT_PACKET_INFO_POOL pPool = pInfo->pPool;
+    vboxNetFltWinQuInterlockedEnqueueHead(&pPool->Queue, pInfo);
+}
+
+/** initializes the packet queue */
+#define INIT_PACKET_QUEUE(_pQueue) InitializeListHead((_pQueue))
+
+/** initializes the packet queue */
+#define INIT_INTERLOCKED_PACKET_QUEUE(_pQueue) \
+    { \
+        INIT_PACKET_QUEUE(&(_pQueue)->Queue); \
+        NdisAllocateSpinLock(&(_pQueue)->Lock); \
+    }
+
+/** delete the packet queue */
+#define FINI_INTERLOCKED_PACKET_QUEUE(_pQueue) NdisFreeSpinLock(&(_pQueue)->Lock)
+
+/** returns the packet the packet info contains */
+#define GET_PACKET_FROM_INFO(_pPacketInfo) (ASMAtomicUoReadPtr((void * volatile *)&(_pPacketInfo)->pPacket))
+
+/** assignes the packet to the packet info */
+#define SET_PACKET_TO_INFO(_pPacketInfo, _pPacket) (ASMAtomicUoWritePtr(&(_pPacketInfo)->pPacket, (_pPacket)))
+
+/** returns the flags the packet info contains */
+#define GET_FLAGS_FROM_INFO(_pPacketInfo) (ASMAtomicUoReadU32((volatile uint32_t *)&(_pPacketInfo)->fFlags))
+
+/** sets flags to the packet info */
+#define SET_FLAGS_TO_INFO(_pPacketInfo, _fFlags) (ASMAtomicUoWriteU32((volatile uint32_t *)&(_pPacketInfo)->fFlags, (_fFlags)))
+
+#ifdef VBOXNETFLT_NO_PACKET_QUEUE
+DECLHIDDEN(bool) vboxNetFltWinPostIntnet(PVBOXNETFLTINS pInstance, PVOID pvPacket, const UINT fFlags);
+#else
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinQuEnqueuePacket(PVBOXNETFLTINS pInstance, PVOID pPacket, const UINT fPacketFlags);
+DECLHIDDEN(void) vboxNetFltWinQuFiniPacketQueue(PVBOXNETFLTINS pInstance);
+DECLHIDDEN(NTSTATUS) vboxNetFltWinQuInitPacketQueue(PVBOXNETFLTINS pInstance);
+#endif /* #ifndef VBOXNETFLT_NO_PACKET_QUEUE */
+
+
+#ifndef VBOXNETADP
+/**
+ * searches the list entry in a single-linked list
+ */
+DECLINLINE(bool) vboxNetFltWinSearchListEntry(PVBOXNETFLT_SINGLE_LIST pList, PSINGLE_LIST_ENTRY pEntry2Search, bool bRemove)
+{
+    PSINGLE_LIST_ENTRY pHead = &pList->Head;
+    PSINGLE_LIST_ENTRY pCur;
+    PSINGLE_LIST_ENTRY pPrev;
+    for (pCur = pHead->Next, pPrev = pHead; pCur; pPrev = pCur, pCur = pCur->Next)
+    {
+        if (pEntry2Search == pCur)
+        {
+            if (bRemove)
+            {
+                pPrev->Next = pCur->Next;
+                if (pCur == pList->pTail)
+                {
+                    pList->pTail = pPrev;
+                }
+            }
+            return true;
+        }
+    }
+    return false;
+}
+
+#if !defined(VBOX_LOOPBACK_USEFLAGS) || defined(DEBUG_NETFLT_PACKETS)
+
+DECLINLINE(PNDIS_PACKET) vboxNetFltWinSearchPacket(PVBOXNETFLT_SINGLE_LIST pList, PNDIS_PACKET pPacket2Search, int cbMatch, bool bRemove)
+{
+    PSINGLE_LIST_ENTRY pHead = &pList->Head;
+    PSINGLE_LIST_ENTRY pCur;
+    PSINGLE_LIST_ENTRY pPrev;
+    PNDIS_PACKET pCurPacket;
+    for (pCur = pHead->Next, pPrev = pHead; pCur; pPrev = pCur, pCur = pCur->Next)
+    {
+        pCurPacket = VBOX_SLE_2_SENDPACKET(pCur);
+        if (pCurPacket == pPacket2Search || vboxNetFltWinMatchPackets(pPacket2Search, pCurPacket, cbMatch))
+        {
+            if (bRemove)
+            {
+                pPrev->Next = pCur->Next;
+                if (pCur == pList->pTail)
+                {
+                    pList->pTail = pPrev;
+                }
+            }
+            return pCurPacket;
+        }
+    }
+    return NULL;
+}
+
+DECLINLINE(PNDIS_PACKET) vboxNetFltWinSearchPacketBySG(PVBOXNETFLT_SINGLE_LIST pList, PINTNETSG pSG, int cbMatch, bool bRemove)
+{
+    PSINGLE_LIST_ENTRY pHead = &pList->Head;
+    PSINGLE_LIST_ENTRY pCur;
+    PSINGLE_LIST_ENTRY pPrev;
+    PNDIS_PACKET pCurPacket;
+    for (pCur = pHead->Next, pPrev = pHead; pCur; pPrev = pCur, pCur = pCur->Next)
+    {
+        pCurPacket = VBOX_SLE_2_SENDPACKET(pCur);
+        if (vboxNetFltWinMatchPacketAndSG(pCurPacket, pSG, cbMatch))
+        {
+            if (bRemove)
+            {
+                pPrev->Next = pCur->Next;
+                if (pCur == pList->pTail)
+                {
+                    pList->pTail = pPrev;
+                }
+            }
+            return pCurPacket;
+        }
+    }
+    return NULL;
+}
+
+#endif /* #if !defined(VBOX_LOOPBACK_USEFLAGS) || defined(DEBUG_NETFLT_PACKETS) */
+
+DECLINLINE(bool) vboxNetFltWinSListIsEmpty(PVBOXNETFLT_SINGLE_LIST pList)
+{
+    return !pList->Head.Next;
+}
+
+DECLINLINE(void) vboxNetFltWinPutTail(PVBOXNETFLT_SINGLE_LIST pList, PSINGLE_LIST_ENTRY pEntry)
+{
+    pList->pTail->Next = pEntry;
+    pList->pTail = pEntry;
+    pEntry->Next = NULL;
+}
+
+DECLINLINE(void) vboxNetFltWinPutHead(PVBOXNETFLT_SINGLE_LIST pList, PSINGLE_LIST_ENTRY pEntry)
+{
+    pEntry->Next = pList->Head.Next;
+    pList->Head.Next = pEntry;
+    if (!pEntry->Next)
+        pList->pTail = pEntry;
+}
+
+DECLINLINE(PSINGLE_LIST_ENTRY) vboxNetFltWinGetHead(PVBOXNETFLT_SINGLE_LIST pList)
+{
+    PSINGLE_LIST_ENTRY pEntry = pList->Head.Next;
+    if (pEntry && pEntry == pList->pTail)
+    {
+        pList->Head.Next = NULL;
+        pList->pTail = &pList->Head;
+    }
+    return pEntry;
+}
+
+DECLINLINE(bool) vboxNetFltWinInterlockedSearchListEntry(PVBOXNETFLT_INTERLOCKED_SINGLE_LIST pList, PSINGLE_LIST_ENTRY pEntry2Search, bool bRemove)
+{
+    bool bFound;
+    NdisAcquireSpinLock(&pList->Lock);
+    bFound = vboxNetFltWinSearchListEntry(&pList->List, pEntry2Search, bRemove);
+    NdisReleaseSpinLock(&pList->Lock);
+    return bFound;
+}
+
+#if !defined(VBOX_LOOPBACK_USEFLAGS) || defined(DEBUG_NETFLT_PACKETS)
+
+DECLINLINE(PNDIS_PACKET) vboxNetFltWinInterlockedSearchPacket(PVBOXNETFLT_INTERLOCKED_SINGLE_LIST pList, PNDIS_PACKET pPacket2Search, int cbMatch, bool bRemove)
+{
+    PNDIS_PACKET pFound;
+    NdisAcquireSpinLock(&pList->Lock);
+    pFound = vboxNetFltWinSearchPacket(&pList->List, pPacket2Search, cbMatch, bRemove);
+    NdisReleaseSpinLock(&pList->Lock);
+    return pFound;
+}
+
+DECLINLINE(PNDIS_PACKET) vboxNetFltWinInterlockedSearchPacketBySG(PVBOXNETFLT_INTERLOCKED_SINGLE_LIST pList, PINTNETSG pSG, int cbMatch, bool bRemove)
+{
+    PNDIS_PACKET pFound;
+    NdisAcquireSpinLock(&pList->Lock);
+    pFound = vboxNetFltWinSearchPacketBySG(&pList->List, pSG, cbMatch, bRemove);
+    NdisReleaseSpinLock(&pList->Lock);
+    return pFound;
+}
+#endif /* #if !defined(VBOX_LOOPBACK_USEFLAGS) || defined(DEBUG_NETFLT_PACKETS) */
+
+DECLINLINE(void) vboxNetFltWinInterlockedPutTail(PVBOXNETFLT_INTERLOCKED_SINGLE_LIST pList, PSINGLE_LIST_ENTRY pEntry)
+{
+    NdisAcquireSpinLock(&pList->Lock);
+    vboxNetFltWinPutTail(&pList->List, pEntry);
+    NdisReleaseSpinLock(&pList->Lock);
+}
+
+DECLINLINE(void) vboxNetFltWinInterlockedPutHead(PVBOXNETFLT_INTERLOCKED_SINGLE_LIST pList, PSINGLE_LIST_ENTRY pEntry)
+{
+    NdisAcquireSpinLock(&pList->Lock);
+    vboxNetFltWinPutHead(&pList->List, pEntry);
+    NdisReleaseSpinLock(&pList->Lock);
+}
+
+DECLINLINE(PSINGLE_LIST_ENTRY) vboxNetFltWinInterlockedGetHead(PVBOXNETFLT_INTERLOCKED_SINGLE_LIST pList)
+{
+    PSINGLE_LIST_ENTRY pEntry;
+    NdisAcquireSpinLock(&pList->Lock);
+    pEntry = vboxNetFltWinGetHead(&pList->List);
+    NdisReleaseSpinLock(&pList->Lock);
+    return pEntry;
+}
+
+# if defined(DEBUG_NETFLT_PACKETS) || !defined(VBOX_LOOPBACK_USEFLAGS)
+DECLINLINE(void) vboxNetFltWinLbPutSendPacket(PVBOXNETFLTINS pNetFlt, PNDIS_PACKET pPacket, bool bFromIntNet)
+{
+    PVBOXNETFLT_PKTRSVD_PT pSrv = (PVBOXNETFLT_PKTRSVD_PT)pPacket->ProtocolReserved;
+    pSrv->bFromIntNet = bFromIntNet;
+    vboxNetFltWinInterlockedPutHead(&pNetFlt->u.s.WinIf.SendPacketQueue, &pSrv->ListEntry);
+}
+
+DECLINLINE(bool) vboxNetFltWinLbIsFromIntNet(PNDIS_PACKET pPacket)
+{
+    PVBOXNETFLT_PKTRSVD_PT pSrv = (PVBOXNETFLT_PKTRSVD_PT)pPacket->ProtocolReserved;
+    return pSrv->bFromIntNet;
+}
+
+DECLINLINE(PNDIS_PACKET) vboxNetFltWinLbSearchLoopBack(PVBOXNETFLTINS pNetFlt, PNDIS_PACKET pPacket, bool bRemove)
+{
+    return vboxNetFltWinInterlockedSearchPacket(&pNetFlt->u.s.WinIf.SendPacketQueue, pPacket, VBOXNETFLT_PACKETMATCH_LENGTH, bRemove);
+}
+
+DECLINLINE(PNDIS_PACKET) vboxNetFltWinLbSearchLoopBackBySG(PVBOXNETFLTINS pNetFlt, PINTNETSG pSG, bool bRemove)
+{
+    return vboxNetFltWinInterlockedSearchPacketBySG(&pNetFlt->u.s.WinIf.SendPacketQueue, pSG, VBOXNETFLT_PACKETMATCH_LENGTH, bRemove);
+}
+
+DECLINLINE(bool) vboxNetFltWinLbRemoveSendPacket(PVBOXNETFLTINS pNetFlt, PNDIS_PACKET pPacket)
+{
+    PVBOXNETFLT_PKTRSVD_PT pSrv = (PVBOXNETFLT_PKTRSVD_PT)pPacket->ProtocolReserved;
+    bool bRet = vboxNetFltWinInterlockedSearchListEntry(&pNetFlt->u.s.WinIf.SendPacketQueue, &pSrv->ListEntry, true);
+#ifdef DEBUG_misha
+    Assert(bRet == (pNetFlt->enmTrunkState == INTNETTRUNKIFSTATE_ACTIVE));
+#endif
+    return bRet;
+}
+
+# endif
+
+#endif
+
+#ifdef DEBUG_misha
+DECLHIDDEN(bool) vboxNetFltWinCheckMACs(PNDIS_PACKET pPacket, PRTMAC pDst, PRTMAC pSrc);
+DECLHIDDEN(bool) vboxNetFltWinCheckMACsSG(PINTNETSG pSG, PRTMAC pDst, PRTMAC pSrc);
+extern RTMAC g_vboxNetFltWinVerifyMACBroadcast;
+extern RTMAC g_vboxNetFltWinVerifyMACGuest;
+
+# define VBOXNETFLT_LBVERIFY(_pnf, _p) \
+    do { \
+        Assert(!vboxNetFltWinCheckMACs(_p, NULL, &g_vboxNetFltWinVerifyMACGuest)); \
+        Assert(!vboxNetFltWinCheckMACs(_p, NULL, &(_pnf)->u.s.MacAddr)); \
+    } while (0)
+
+# define VBOXNETFLT_LBVERIFYSG(_pnf, _p) \
+    do { \
+        Assert(!vboxNetFltWinCheckMACsSG(_p, NULL, &g_vboxNetFltWinVerifyMACGuest)); \
+        Assert(!vboxNetFltWinCheckMACsSG(_p, NULL, &(_pnf)->u.s.MacAddr)); \
+    } while (0)
+
+#else
+# define VBOXNETFLT_LBVERIFY(_pnf, _p) do { } while (0)
+# define VBOXNETFLT_LBVERIFYSG(_pnf, _p) do { } while (0)
+#endif
+
+/** initializes the list */
+#define INIT_SINGLE_LIST(_pList) \
+    { \
+        (_pList)->Head.Next = NULL; \
+        (_pList)->pTail = &(_pList)->Head; \
+    }
+
+/** initializes the list */
+#define INIT_INTERLOCKED_SINGLE_LIST(_pList) \
+    do { \
+        INIT_SINGLE_LIST(&(_pList)->List); \
+        NdisAllocateSpinLock(&(_pList)->Lock); \
+    } while (0)
+
+/** delete the packet queue */
+#define FINI_INTERLOCKED_SINGLE_LIST(_pList) \
+    do { \
+        Assert(vboxNetFltWinSListIsEmpty(&(_pList)->List)); \
+        NdisFreeSpinLock(&(_pList)->Lock) \
+    } while (0)
+
+
+/**************************************************************************
+ * PVBOXNETFLTINS , WinIf reference/dereference (i.e. retain/release) API *
+ **************************************************************************/
+
+
+DECLHIDDEN(void) vboxNetFltWinWaitDereference(PVBOXNETFLT_WINIF_DEVICE pState);
+
+DECLINLINE(void) vboxNetFltWinReferenceModeNetFlt(PVBOXNETFLTINS pIns)
+{
+    ASMAtomicIncU32((volatile uint32_t *)&pIns->u.s.cModeNetFltRefs);
+}
+
+DECLINLINE(void) vboxNetFltWinReferenceModePassThru(PVBOXNETFLTINS pIns)
+{
+    ASMAtomicIncU32((volatile uint32_t *)&pIns->u.s.cModePassThruRefs);
+}
+
+DECLINLINE(void) vboxNetFltWinIncReferenceModeNetFlt(PVBOXNETFLTINS pIns, uint32_t v)
+{
+    ASMAtomicAddU32((volatile uint32_t *)&pIns->u.s.cModeNetFltRefs, v);
+}
+
+DECLINLINE(void) vboxNetFltWinIncReferenceModePassThru(PVBOXNETFLTINS pIns, uint32_t v)
+{
+    ASMAtomicAddU32((volatile uint32_t *)&pIns->u.s.cModePassThruRefs, v);
+}
+
+DECLINLINE(void) vboxNetFltWinDereferenceModeNetFlt(PVBOXNETFLTINS pIns)
+{
+    ASMAtomicDecU32((volatile uint32_t *)&pIns->u.s.cModeNetFltRefs);
+}
+
+DECLINLINE(void) vboxNetFltWinDereferenceModePassThru(PVBOXNETFLTINS pIns)
+{
+    ASMAtomicDecU32((volatile uint32_t *)&pIns->u.s.cModePassThruRefs);
+}
+
+DECLINLINE(void) vboxNetFltWinDecReferenceModeNetFlt(PVBOXNETFLTINS pIns, uint32_t v)
+{
+    Assert(v);
+    ASMAtomicAddU32((volatile uint32_t *)&pIns->u.s.cModeNetFltRefs, (uint32_t)(-((int32_t)v)));
+}
+
+DECLINLINE(void) vboxNetFltWinDecReferenceModePassThru(PVBOXNETFLTINS pIns, uint32_t v)
+{
+    Assert(v);
+    ASMAtomicAddU32((volatile uint32_t *)&pIns->u.s.cModePassThruRefs, (uint32_t)(-((int32_t)v)));
+}
+
+DECLINLINE(void) vboxNetFltWinSetPowerState(PVBOXNETFLT_WINIF_DEVICE pState, NDIS_DEVICE_POWER_STATE State)
+{
+    ASMAtomicUoWriteU32((volatile uint32_t *)&pState->PowerState, State);
+}
+
+DECLINLINE(NDIS_DEVICE_POWER_STATE) vboxNetFltWinGetPowerState(PVBOXNETFLT_WINIF_DEVICE pState)
+{
+    return (NDIS_DEVICE_POWER_STATE)ASMAtomicUoReadU32((volatile uint32_t *)&pState->PowerState);
+}
+
+DECLINLINE(void) vboxNetFltWinSetOpState(PVBOXNETFLT_WINIF_DEVICE pState, VBOXNETDEVOPSTATE State)
+{
+    ASMAtomicUoWriteU32((volatile uint32_t *)&pState->OpState, State);
+}
+
+DECLINLINE(VBOXNETDEVOPSTATE) vboxNetFltWinGetOpState(PVBOXNETFLT_WINIF_DEVICE pState)
+{
+    return (VBOXNETDEVOPSTATE)ASMAtomicUoReadU32((volatile uint32_t *)&pState->OpState);
+}
+
+DECLINLINE(bool) vboxNetFltWinDoReferenceDevice(PVBOXNETFLT_WINIF_DEVICE pState)
+{
+    if (vboxNetFltWinGetPowerState(pState) == NdisDeviceStateD0 && vboxNetFltWinGetOpState(pState) == kVBoxNetDevOpState_Initialized)
+    {
+        /** @todo r=bird: Since this is a volatile member, why don't you declare it as
+         *        such and save yourself all the casting? */
+        ASMAtomicIncU32((uint32_t volatile *)&pState->cReferences);
+        return true;
+    }
+    return false;
+}
+
+#ifndef VBOXNETADP
+DECLINLINE(bool) vboxNetFltWinDoReferenceDevices(PVBOXNETFLT_WINIF_DEVICE pState1, PVBOXNETFLT_WINIF_DEVICE pState2)
+{
+    if (vboxNetFltWinGetPowerState(pState1) == NdisDeviceStateD0
+            && vboxNetFltWinGetOpState(pState1) == kVBoxNetDevOpState_Initialized
+            && vboxNetFltWinGetPowerState(pState2) == NdisDeviceStateD0
+            && vboxNetFltWinGetOpState(pState2) == kVBoxNetDevOpState_Initialized)
+    {
+        ASMAtomicIncU32((uint32_t volatile *)&pState1->cReferences);
+        ASMAtomicIncU32((uint32_t volatile *)&pState2->cReferences);
+        return true;
+    }
+    return false;
+}
+#endif
+
+DECLINLINE(void) vboxNetFltWinDereferenceDevice(PVBOXNETFLT_WINIF_DEVICE pState)
+{
+    ASMAtomicDecU32((uint32_t volatile *)&pState->cReferences);
+    /** @todo r=bird: Add comment explaining why these cannot hit 0 or why
+     *        reference are counted  */
+}
+
+#ifndef VBOXNETADP
+DECLINLINE(void) vboxNetFltWinDereferenceDevices(PVBOXNETFLT_WINIF_DEVICE pState1, PVBOXNETFLT_WINIF_DEVICE pState2)
+{
+    ASMAtomicDecU32((uint32_t volatile *)&pState1->cReferences);
+    ASMAtomicDecU32((uint32_t volatile *)&pState2->cReferences);
+}
+#endif
+
+DECLINLINE(void) vboxNetFltWinDecReferenceDevice(PVBOXNETFLT_WINIF_DEVICE pState, uint32_t v)
+{
+    Assert(v);
+    ASMAtomicAddU32((uint32_t volatile *)&pState->cReferences, (uint32_t)(-((int32_t)v)));
+}
+
+#ifndef VBOXNETADP
+DECLINLINE(void) vboxNetFltWinDecReferenceDevices(PVBOXNETFLT_WINIF_DEVICE pState1, PVBOXNETFLT_WINIF_DEVICE pState2, uint32_t v)
+{
+    ASMAtomicAddU32((uint32_t volatile *)&pState1->cReferences, (uint32_t)(-((int32_t)v)));
+    ASMAtomicAddU32((uint32_t volatile *)&pState2->cReferences, (uint32_t)(-((int32_t)v)));
+}
+#endif
+
+DECLINLINE(bool) vboxNetFltWinDoIncReferenceDevice(PVBOXNETFLT_WINIF_DEVICE pState, uint32_t v)
+{
+    Assert(v);
+    if (vboxNetFltWinGetPowerState(pState) == NdisDeviceStateD0 && vboxNetFltWinGetOpState(pState) == kVBoxNetDevOpState_Initialized)
+    {
+        ASMAtomicAddU32((uint32_t volatile *)&pState->cReferences, v);
+        return true;
+    }
+    return false;
+}
+
+#ifndef VBOXNETADP
+DECLINLINE(bool) vboxNetFltWinDoIncReferenceDevices(PVBOXNETFLT_WINIF_DEVICE pState1, PVBOXNETFLT_WINIF_DEVICE pState2, uint32_t v)
+{
+    if (vboxNetFltWinGetPowerState(pState1) == NdisDeviceStateD0
+            && vboxNetFltWinGetOpState(pState1) == kVBoxNetDevOpState_Initialized
+            && vboxNetFltWinGetPowerState(pState2) == NdisDeviceStateD0
+            && vboxNetFltWinGetOpState(pState2) == kVBoxNetDevOpState_Initialized)
+    {
+        ASMAtomicAddU32((uint32_t volatile *)&pState1->cReferences, v);
+        ASMAtomicAddU32((uint32_t volatile *)&pState2->cReferences, v);
+        return true;
+    }
+    return false;
+}
+#endif
+
+
+DECLINLINE(bool) vboxNetFltWinReferenceWinIfNetFlt(PVBOXNETFLTINS pNetFlt, bool * pbNetFltActive)
+{
+    RTSpinlockAcquire((pNetFlt)->hSpinlock);
+#ifndef VBOXNETADP
+    if (!vboxNetFltWinDoReferenceDevices(&pNetFlt->u.s.WinIf.MpState, &pNetFlt->u.s.WinIf.PtState))
+#else
+    if (!vboxNetFltWinDoReferenceDevice(&pNetFlt->u.s.WinIf.MpState))
+#endif
+    {
+        RTSpinlockRelease((pNetFlt)->hSpinlock);
+        *pbNetFltActive = false;
+        return false;
+    }
+
+    if (pNetFlt->enmTrunkState != INTNETTRUNKIFSTATE_ACTIVE)
+    {
+        vboxNetFltWinReferenceModePassThru(pNetFlt);
+        RTSpinlockRelease((pNetFlt)->hSpinlock);
+        *pbNetFltActive = false;
+        return true;
+    }
+
+    vboxNetFltRetain((pNetFlt), true /* fBusy */);
+    vboxNetFltWinReferenceModeNetFlt(pNetFlt);
+    RTSpinlockRelease((pNetFlt)->hSpinlock);
+
+    *pbNetFltActive = true;
+    return true;
+}
+
+DECLINLINE(bool) vboxNetFltWinIncReferenceWinIfNetFlt(PVBOXNETFLTINS pNetFlt, uint32_t v, bool *pbNetFltActive)
+{
+    uint32_t i;
+
+    Assert(v);
+    if (!v)
+    {
+        *pbNetFltActive = false;
+        return false;
+    }
+
+    RTSpinlockAcquire((pNetFlt)->hSpinlock);
+#ifndef VBOXNETADP
+    if (!vboxNetFltWinDoIncReferenceDevices(&pNetFlt->u.s.WinIf.MpState, &pNetFlt->u.s.WinIf.PtState, v))
+#else
+    if (!vboxNetFltWinDoIncReferenceDevice(&pNetFlt->u.s.WinIf.MpState, v))
+#endif
+    {
+        RTSpinlockRelease(pNetFlt->hSpinlock);
+        *pbNetFltActive = false;
+        return false;
+    }
+
+    if (pNetFlt->enmTrunkState != INTNETTRUNKIFSTATE_ACTIVE)
+    {
+        vboxNetFltWinIncReferenceModePassThru(pNetFlt, v);
+
+        RTSpinlockRelease((pNetFlt)->hSpinlock);
+        *pbNetFltActive = false;
+        return true;
+    }
+
+    vboxNetFltRetain(pNetFlt, true /* fBusy */);
+
+    vboxNetFltWinIncReferenceModeNetFlt(pNetFlt, v);
+
+    RTSpinlockRelease(pNetFlt->hSpinlock);
+
+    /* we have marked it as busy, so can do the res references outside the lock */
+    for (i = 0; i < v-1; i++)
+    {
+        vboxNetFltRetain(pNetFlt, true /* fBusy */);
+    }
+
+    *pbNetFltActive = true;
+
+    return true;
+}
+
+DECLINLINE(void) vboxNetFltWinDecReferenceNetFlt(PVBOXNETFLTINS pNetFlt, uint32_t n)
+{
+    uint32_t i;
+    for (i = 0; i < n; i++)
+    {
+        vboxNetFltRelease(pNetFlt, true);
+    }
+
+    vboxNetFltWinDecReferenceModeNetFlt(pNetFlt, n);
+}
+
+DECLINLINE(void) vboxNetFltWinDereferenceNetFlt(PVBOXNETFLTINS pNetFlt)
+{
+    vboxNetFltRelease(pNetFlt, true);
+
+    vboxNetFltWinDereferenceModeNetFlt(pNetFlt);
+}
+
+DECLINLINE(void) vboxNetFltWinDecReferenceWinIf(PVBOXNETFLTINS pNetFlt, uint32_t v)
+{
+#ifdef VBOXNETADP
+    vboxNetFltWinDecReferenceDevice(&pNetFlt->u.s.WinIf.MpState, v);
+#else
+    vboxNetFltWinDecReferenceDevices(&pNetFlt->u.s.WinIf.MpState, &pNetFlt->u.s.WinIf.PtState, v);
+#endif
+}
+
+DECLINLINE(void) vboxNetFltWinDereferenceWinIf(PVBOXNETFLTINS pNetFlt)
+{
+#ifdef VBOXNETADP
+    vboxNetFltWinDereferenceDevice(&pNetFlt->u.s.WinIf.MpState);
+#else
+    vboxNetFltWinDereferenceDevices(&pNetFlt->u.s.WinIf.MpState, &pNetFlt->u.s.WinIf.PtState);
+#endif
+}
+
+DECLINLINE(bool) vboxNetFltWinIncReferenceWinIf(PVBOXNETFLTINS pNetFlt, uint32_t v)
+{
+    Assert(v);
+    if (!v)
+    {
+        return false;
+    }
+
+    RTSpinlockAcquire(pNetFlt->hSpinlock);
+#ifdef VBOXNETADP
+    if (vboxNetFltWinDoIncReferenceDevice(&pNetFlt->u.s.WinIf.MpState, v))
+#else
+    if (vboxNetFltWinDoIncReferenceDevices(&pNetFlt->u.s.WinIf.MpState, &pNetFlt->u.s.WinIf.PtState, v))
+#endif
+    {
+        RTSpinlockRelease(pNetFlt->hSpinlock);
+        return true;
+    }
+
+    RTSpinlockRelease(pNetFlt->hSpinlock);
+    return false;
+}
+
+DECLINLINE(bool) vboxNetFltWinReferenceWinIf(PVBOXNETFLTINS pNetFlt)
+{
+    RTSpinlockAcquire(pNetFlt->hSpinlock);
+#ifdef VBOXNETADP
+    if (vboxNetFltWinDoReferenceDevice(&pNetFlt->u.s.WinIf.MpState))
+#else
+    if (vboxNetFltWinDoReferenceDevices(&pNetFlt->u.s.WinIf.MpState, &pNetFlt->u.s.WinIf.PtState))
+#endif
+    {
+        RTSpinlockRelease(pNetFlt->hSpinlock);
+        return true;
+    }
+
+    RTSpinlockRelease(pNetFlt->hSpinlock);
+    return false;
+}
+
+/***********************************************
+ * methods for accessing the network card info *
+ ***********************************************/
+
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinGetMacAddress(PVBOXNETFLTINS pNetFlt, PRTMAC pMac);
+DECLHIDDEN(bool) vboxNetFltWinIsPromiscuous(PVBOXNETFLTINS pNetFlt);
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinSetPromiscuous(PVBOXNETFLTINS pNetFlt, bool bYes);
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinQueryPhysicalMedium(PVBOXNETFLTINS pNetFlt, NDIS_PHYSICAL_MEDIUM * pMedium);
+
+/*********************
+ * mem alloc API     *
+ *********************/
+
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinMemAlloc(PVOID* ppMemBuf, UINT cbLength);
+
+DECLHIDDEN(void) vboxNetFltWinMemFree(PVOID pMemBuf);
+
+/* convenience method used which allocates and initializes the PINTNETSG containing one
+ * segment referring the buffer of size cbBufSize
+ * the allocated PINTNETSG should be freed with the vboxNetFltWinMemFree.
+ *
+ * This is used when our ProtocolReceive callback is called and we have to return the indicated NDIS_PACKET
+ * on a callback exit. This is why we allocate the PINTNETSG and put the packet info there and enqueue it
+ * for the packet queue */
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinAllocSG(UINT cbBufSize, PINTNETSG *ppSG);
+
+/************************
+ * WinIf init/fini API *
+ ************************/
+#if defined(VBOXNETADP)
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinPtInitBind(PVBOXNETFLTINS *ppNetFlt, NDIS_HANDLE hMiniportAdapter, PNDIS_STRING pBindToMiniportName /* actually this is our miniport name*/, NDIS_HANDLE hWrapperConfigurationContext);
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinPtInitWinIf(PVBOXNETFLTWIN pWinIf);
+#else
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinPtInitBind(PVBOXNETFLTINS *ppNetFlt, PNDIS_STRING pOurMiniportName, PNDIS_STRING pBindToMiniportName);
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinPtInitWinIf(PVBOXNETFLTWIN pWinIf, PNDIS_STRING pOurDeviceName);
+#endif
+
+DECLHIDDEN(VOID) vboxNetFltWinPtFiniWinIf(PVBOXNETFLTWIN pWinIf);
+
+/************************************
+ * Execute Job at passive level API *
+ ************************************/
+
+typedef VOID (*PFNVBOXNETFLT_JOB_ROUTINE) (PVOID pContext);
+
+DECLHIDDEN(VOID) vboxNetFltWinJobSynchExecAtPassive(PFNVBOXNETFLT_JOB_ROUTINE pfnRoutine, PVOID pContext);
+
+/*******************************
+ * Ndis Packets processing API *
+ *******************************/
+DECLHIDDEN(PNDIS_PACKET) vboxNetFltWinNdisPacketFromSG(PVBOXNETFLTINS pNetFlt, PINTNETSG pSG, PVOID pBufToFree, bool bToWire, bool bCopyMemory);
+
+DECLHIDDEN(void) vboxNetFltWinFreeSGNdisPacket(PNDIS_PACKET pPacket, bool bFreeMem);
+
+#ifdef DEBUG_NETFLT_PACKETS
+#define DBG_CHECK_PACKETS(_p1, _p2) \
+    {   \
+        bool _b = vboxNetFltWinMatchPackets(_p1, _p2, -1);  \
+        Assert(_b);  \
+    }
+
+#define DBG_CHECK_PACKET_AND_SG(_p, _sg) \
+    {   \
+        bool _b = vboxNetFltWinMatchPacketAndSG(_p, _sg, -1);  \
+        Assert(_b);  \
+    }
+
+#define DBG_CHECK_SGS(_sg1, _sg2) \
+    {   \
+        bool _b = vboxNetFltWinMatchSGs(_sg1, _sg2, -1);  \
+        Assert(_b);  \
+    }
+
+#else
+#define DBG_CHECK_PACKETS(_p1, _p2)
+#define DBG_CHECK_PACKET_AND_SG(_p, _sg)
+#define DBG_CHECK_SGS(_sg1, _sg2)
+#endif
+
+/**
+ * Ndis loops back broadcast packets posted to the wire by IntNet
+ * This routine is used in the mechanism of preventing this looping
+ *
+ * @param pAdapt
+ * @param pPacket
+ * @param bOnRecv true is we are receiving the packet from the wire
+ * false otherwise (i.e. the packet is from the host)
+ *
+ * @return true if the packet is a looped back one, false otherwise
+ */
+#ifdef VBOX_LOOPBACK_USEFLAGS
+DECLINLINE(bool) vboxNetFltWinIsLoopedBackPacket(PNDIS_PACKET pPacket)
+{
+    return (NdisGetPacketFlags(pPacket) & g_fPacketIsLoopedBack) == g_fPacketIsLoopedBack;
+}
+#endif
+
+/**************************************************************
+ * utility methods for ndis packet creation/initialization    *
+ **************************************************************/
+
+#define VBOXNETFLT_OOB_INIT(_p) \
+    { \
+        NdisZeroMemory(NDIS_OOB_DATA_FROM_PACKET(_p), sizeof(NDIS_PACKET_OOB_DATA)); \
+        NDIS_SET_PACKET_HEADER_SIZE(_p, VBOXNETFLT_PACKET_ETHEADER_SIZE); \
+    }
+
+#ifndef VBOXNETADP
+
+DECLINLINE(NDIS_STATUS) vboxNetFltWinCopyPacketInfoOnRecv(PNDIS_PACKET pDstPacket, PNDIS_PACKET pSrcPacket, bool bForceStatusResources)
+{
+    NDIS_STATUS Status = bForceStatusResources ? NDIS_STATUS_RESOURCES : NDIS_GET_PACKET_STATUS(pSrcPacket);
+    NDIS_SET_PACKET_STATUS(pDstPacket, Status);
+
+    NDIS_PACKET_FIRST_NDIS_BUFFER(pDstPacket) = NDIS_PACKET_FIRST_NDIS_BUFFER(pSrcPacket);
+    NDIS_PACKET_LAST_NDIS_BUFFER(pDstPacket) = NDIS_PACKET_LAST_NDIS_BUFFER(pSrcPacket);
+
+    NdisGetPacketFlags(pDstPacket) = NdisGetPacketFlags(pSrcPacket);
+
+    NDIS_SET_ORIGINAL_PACKET(pDstPacket, NDIS_GET_ORIGINAL_PACKET(pSrcPacket));
+    NDIS_SET_PACKET_HEADER_SIZE(pDstPacket, NDIS_GET_PACKET_HEADER_SIZE(pSrcPacket));
+
+    return Status;
+}
+
+DECLINLINE(void) vboxNetFltWinCopyPacketInfoOnSend(PNDIS_PACKET pDstPacket, PNDIS_PACKET pSrcPacket)
+{
+    NDIS_PACKET_FIRST_NDIS_BUFFER(pDstPacket) = NDIS_PACKET_FIRST_NDIS_BUFFER(pSrcPacket);
+    NDIS_PACKET_LAST_NDIS_BUFFER(pDstPacket) = NDIS_PACKET_LAST_NDIS_BUFFER(pSrcPacket);
+
+    NdisGetPacketFlags(pDstPacket) = NdisGetPacketFlags(pSrcPacket);
+
+    NdisMoveMemory(NDIS_OOB_DATA_FROM_PACKET(pDstPacket),
+                    NDIS_OOB_DATA_FROM_PACKET(pSrcPacket),
+                    sizeof (NDIS_PACKET_OOB_DATA));
+
+    NdisIMCopySendPerPacketInfo(pDstPacket, pSrcPacket);
+
+    PVOID pMediaSpecificInfo = NULL;
+    UINT fMediaSpecificInfoSize = 0;
+
+    NDIS_GET_PACKET_MEDIA_SPECIFIC_INFO(pSrcPacket, &pMediaSpecificInfo, &fMediaSpecificInfoSize);
+
+    if (pMediaSpecificInfo || fMediaSpecificInfoSize)
+    {
+        NDIS_SET_PACKET_MEDIA_SPECIFIC_INFO(pDstPacket, pMediaSpecificInfo, fMediaSpecificInfoSize);
+    }
+}
+
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinPrepareSendPacket(PVBOXNETFLTINS pNetFlt, PNDIS_PACKET pPacket, PNDIS_PACKET *ppMyPacket);
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinPrepareRecvPacket(PVBOXNETFLTINS pNetFlt, PNDIS_PACKET pPacket, PNDIS_PACKET *ppMyPacket, bool bDpr);
+#endif
+
+DECLHIDDEN(void) vboxNetFltWinSleep(ULONG milis);
+
+#define MACS_EQUAL(_m1, _m2) \
+    ((_m1).au16[0] == (_m2).au16[0] \
+        && (_m1).au16[1] == (_m2).au16[1] \
+        && (_m1).au16[2] == (_m2).au16[2])
+
+
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinDetachFromInterface(PVBOXNETFLTINS pNetFlt, bool bOnUnbind);
+DECLHIDDEN(NDIS_STATUS) vboxNetFltWinCopyString(PNDIS_STRING pDst, PNDIS_STRING pSrc);
+
+
+/**
+ * Sets the enmState member atomically.
+ *
+ * Used for all updates.
+ *
+ * @param   pThis           The instance.
+ * @param   enmNewState     The new value.
+ */
+DECLINLINE(void) vboxNetFltWinSetWinIfState(PVBOXNETFLTINS pNetFlt, VBOXNETFLT_WINIFSTATE enmNewState)
+{
+    ASMAtomicWriteU32((uint32_t volatile *)&pNetFlt->u.s.WinIf.enmState, enmNewState);
+}
+
+/**
+ * Gets the enmState member atomically.
+ *
+ * Used for all reads.
+ *
+ * @returns The enmState value.
+ * @param   pThis           The instance.
+ */
+DECLINLINE(VBOXNETFLT_WINIFSTATE) vboxNetFltWinGetWinIfState(PVBOXNETFLTINS pNetFlt)
+{
+    return (VBOXNETFLT_WINIFSTATE)ASMAtomicUoReadU32((uint32_t volatile *)&pNetFlt->u.s.WinIf.enmState);
+}
+
+/* reference the driver module to prevent driver unload */
+DECLHIDDEN(void) vboxNetFltWinDrvReference();
+/* dereference the driver module to prevent driver unload */
+DECLHIDDEN(void) vboxNetFltWinDrvDereference();
+
+
+#ifndef VBOXNETADP
+# define VBOXNETFLT_PROMISCUOUS_SUPPORTED(_pNetFlt) (!(_pNetFlt)->fDisablePromiscuous)
+#else
+# define STATISTIC_INCREASE(_s) ASMAtomicIncU32((uint32_t volatile *)&(_s));
+
+DECLHIDDEN(void) vboxNetFltWinGenerateMACAddress(RTMAC *pMac);
+DECLHIDDEN(int) vboxNetFltWinMAC2NdisString(RTMAC *pMac, PNDIS_STRING pNdisString);
+DECLHIDDEN(int) vboxNetFltWinMACFromNdisString(RTMAC *pMac, PNDIS_STRING pNdisString);
+
+#endif
+#endif /* !VBOX_INCLUDED_SRC_VBoxNetFlt_win_drv_VBoxNetFltRt_win_h */
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetLwf-win.cpp b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetLwf-win.cpp
new file mode 100644
index 00000000..40e025eb
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetLwf-win.cpp
@@ -0,0 +1,2726 @@
+/* $Id: VBoxNetLwf-win.cpp $ */
+/** @file
+ * VBoxNetLwf-win.cpp - NDIS6 Bridged Networking Driver, Windows-specific code.
+ */
+/*
+ * Copyright (C) 2014-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+#define LOG_GROUP LOG_GROUP_NET_FLT_DRV
+
+/*
+ * If VBOXNETLWF_SYNC_SEND is defined we won't allocate data buffers, but use
+ * the original buffers coming from IntNet to build MDLs around them. This
+ * also means that we need to wait for send operation to complete before
+ * returning the buffers, which hinders performance way too much.
+ */
+//#define VBOXNETLWF_SYNC_SEND
+
+/*
+ * If VBOXNETLWF_FIXED_SIZE_POOLS is defined we pre-allocate data buffers of
+ * fixed size in five pools. Each pool uses different size to accomodate packets
+ * of various sizes. We allocate these buffers once and re-use them when send
+ * operation is complete.
+ * If VBOXNETLWF_FIXED_SIZE_POOLS is not defined we allocate data buffers before
+ * each send operation and free then upon completion.
+ */
+#define VBOXNETLWF_FIXED_SIZE_POOLS
+
+/*
+ * Don't ask me why it is 42. Empirically this is what goes down the stack.
+ * OTOH, as we know from trustworthy sources, 42 is the answer, so be it.
+ */
+#define VBOXNETLWF_MAX_FRAME_SIZE(mtu) (mtu + 42)
+
+#include <VBox/version.h>
+#include <VBox/err.h>
+#include <iprt/initterm.h>
+#include <iprt/net.h>
+#include <iprt/list.h>
+#include <VBox/intnetinline.h>
+
+#include <iprt/nt/ntddk.h>
+#include <iprt/nt/ndis.h>
+#include <iprt/win/netioapi.h>
+#include <mstcpip.h>
+
+#define LogError(x) DbgPrint x
+
+#if 0
+#undef Log
+#define Log(x) DbgPrint x
+#undef LogFlow
+#define LogFlow(x) DbgPrint x
+#endif
+
+/** We have an entirely different structure than the one defined in VBoxNetFltCmn-win.h */
+typedef struct VBOXNETFLTWIN
+{
+    /** filter module context handle */
+    NDIS_HANDLE hModuleCtx;
+    /** IP address change notifier handle */
+    HANDLE hNotifier; /* Must be here as hModuleCtx may already be NULL when vboxNetFltOsDeleteInstance is called */
+} VBOXNETFLTWIN, *PVBOXNETFLTWIN;
+#define VBOXNETFLT_NO_PACKET_QUEUE
+#define VBOXNETFLT_OS_SPECFIC 1
+#include "VBoxNetFltInternal.h"
+
+#include "VBoxNetLwf-win.h"
+#include "VBox/VBoxNetCmn-win.h"
+
+typedef enum {
+    LwfState_Detached = 0,
+    LwfState_Attaching,
+    LwfState_Paused,
+    LwfState_Restarting,
+    LwfState_Running,
+    LwfState_Pausing,
+    LwfState_32BitHack = 0x7fffffff
+} VBOXNETLWFSTATE;
+
+/*
+ * Valid state transitions are:
+ * 1) Disconnected -> Connecting   : start the worker thread, attempting to init IDC;
+ * 2) Connecting   -> Disconnected : failed to start IDC init worker thread;
+ * 3) Connecting   -> Connected    : IDC init successful, terminate the worker;
+ * 4) Connecting   -> Stopping     : IDC init incomplete, but the driver is being unloaded, terminate the worker;
+ * 5) Connected    -> Stopping     : IDC init was successful, no worker, the driver is being unloaded;
+ *
+ * Driver terminates in Stopping state.
+ */
+typedef enum {
+    LwfIdcState_Disconnected = 0, /* Initial state */
+    LwfIdcState_Connecting,       /* Attemping to init IDC, worker thread running */
+    LwfIdcState_Connected,        /* Successfully connected to IDC, worker thread terminated */
+    LwfIdcState_Stopping          /* Terminating the worker thread and disconnecting IDC */
+} VBOXNETLWFIDCSTATE;
+
+struct _VBOXNETLWF_MODULE;
+
+typedef struct VBOXNETLWFGLOBALS
+{
+    /** synch event used for device creation synchronization */
+    //KEVENT SynchEvent;
+    /** Device reference count */
+    //int cDeviceRefs;
+    /** ndis device */
+    NDIS_HANDLE hDevice;
+    /** device object */
+    PDEVICE_OBJECT pDevObj;
+    /** our filter driver handle */
+    NDIS_HANDLE hFilterDriver;
+    /** lock protecting the module list */
+    NDIS_SPIN_LOCK Lock;
+    /** the head of module list */
+    RTLISTANCHOR listModules;
+    /** IDC initialization state */
+    volatile uint32_t enmIdcState;
+    /** IDC init thread handle */
+    HANDLE hInitIdcThread;
+} VBOXNETLWFGLOBALS, *PVBOXNETLWFGLOBALS;
+
+/**
+ * The (common) global data.
+ */
+static VBOXNETFLTGLOBALS g_VBoxNetFltGlobals;
+/* win-specific global data */
+VBOXNETLWFGLOBALS g_VBoxNetLwfGlobals;
+
+#ifdef VBOXNETLWF_FIXED_SIZE_POOLS
+static ULONG g_cbPool[] = { 576+56, 1556, 4096+56, 6192+56, 9056 };
+#endif /* VBOXNETLWF_FIXED_SIZE_POOLS */
+
+typedef struct _VBOXNETLWF_MODULE {
+    RTLISTNODE node;
+
+    NDIS_HANDLE hFilter;
+#ifndef VBOXNETLWF_FIXED_SIZE_POOLS
+    NDIS_HANDLE hPool;
+#else /* VBOXNETLWF_FIXED_SIZE_POOLS */
+    NDIS_HANDLE hPool[RT_ELEMENTS(g_cbPool)];
+#endif /* VBOXNETLWF_FIXED_SIZE_POOLS */
+    PVBOXNETLWFGLOBALS pGlobals;
+    /** Associated instance of NetFlt, one-to-one relationship */
+    PVBOXNETFLTINS pNetFlt; /// @todo Consider automic access!
+    /** Module state as described in http://msdn.microsoft.com/en-us/library/windows/hardware/ff550017(v=vs.85).aspx */
+    volatile uint32_t enmState; /* No lock needed yet, atomic should suffice. */
+    /** Mutex to prevent pausing while transmitting on behalf of NetFlt */
+    NDIS_MUTEX InTransmit;
+#ifdef VBOXNETLWF_SYNC_SEND
+    /** Event signalled when sending to the wire is complete */
+    KEVENT EventWire;
+    /** Event signalled when NDIS returns our receive notification */
+    KEVENT EventHost;
+#else /* !VBOXNETLWF_SYNC_SEND */
+    /** Event signalled when all pending sends (both to wire and host) have completed */
+    NDIS_EVENT EventSendComplete;
+    /** Counter for pending sends (both to wire and host) */
+    int32_t cPendingBuffers;
+    /** Work Item to deliver offloading indications at passive IRQL */
+    NDIS_HANDLE hWorkItem;
+#endif /* !VBOXNETLWF_SYNC_SEND */
+    /** MAC address of underlying adapter */
+    RTMAC MacAddr;
+    /** Size of offload config structure */
+    USHORT cbOffloadConfig;
+    /** Saved offload configuration */
+    PNDIS_OFFLOAD pSavedOffloadConfig;
+    /** Temporary buffer for disabling offload configuration */
+    PNDIS_OFFLOAD pDisabledOffloadConfig;
+    /** the cloned request we have passed down */
+    PNDIS_OID_REQUEST pPendingRequest;
+    /** true if the underlying miniport supplied offloading config */
+    bool fOffloadConfigValid;
+    /** true if the trunk expects data from us */
+    bool fActive;
+    /** true if the host wants the adapter to be in promisc mode */
+    bool fHostPromisc;
+    /** true if the user wants packets being sent or received by VMs to be visible to the host in promisc mode */
+    bool fPassVmTrafficToHost;
+    /** Name of underlying adapter */
+    char szMiniportName[1];
+} VBOXNETLWF_MODULE;
+typedef VBOXNETLWF_MODULE *PVBOXNETLWF_MODULE;
+
+/*
+ * A structure to wrap OID requests in.
+ */
+typedef struct _VBOXNETLWF_OIDREQ {
+    NDIS_OID_REQUEST Request;
+    NDIS_STATUS Status;
+    NDIS_EVENT Event;
+} VBOXNETLWF_OIDREQ;
+typedef VBOXNETLWF_OIDREQ *PVBOXNETLWF_OIDREQ;
+
+
+/*********************************************************************************************************************************
+*   Internal Functions                                                                                                           *
+*********************************************************************************************************************************/
+static FILTER_ATTACH                            vboxNetLwfWinAttach;
+static FILTER_DETACH                            vboxNetLwfWinDetach;
+static FILTER_RESTART                           vboxNetLwfWinRestart;
+static FILTER_PAUSE                             vboxNetLwfWinPause;
+static FILTER_OID_REQUEST                       vboxNetLwfWinOidRequest;
+static FILTER_OID_REQUEST_COMPLETE              vboxNetLwfWinOidRequestComplete;
+//static FILTER_CANCEL_OID_REQUEST                vboxNetLwfWinCancelOidRequest;
+static FILTER_STATUS                            vboxNetLwfWinStatus;
+//static FILTER_NET_PNP_EVENT                     vboxNetLwfWinPnPEvent;
+static FILTER_SEND_NET_BUFFER_LISTS             vboxNetLwfWinSendNetBufferLists;
+static FILTER_SEND_NET_BUFFER_LISTS_COMPLETE    vboxNetLwfWinSendNetBufferListsComplete;
+static FILTER_RECEIVE_NET_BUFFER_LISTS          vboxNetLwfWinReceiveNetBufferLists;
+static FILTER_RETURN_NET_BUFFER_LISTS           vboxNetLwfWinReturnNetBufferLists;
+static KSTART_ROUTINE vboxNetLwfWinInitIdcWorker;
+
+static VOID vboxNetLwfWinUnloadDriver(IN PDRIVER_OBJECT pDriver);
+static int  vboxNetLwfWinInitBase(void);
+static int  vboxNetLwfWinFini(void);
+
+
+
+/**
+ * Logs an error to the system event log.
+ *
+ * @param   ErrCode        Error to report to event log.
+ * @param   ReturnedStatus Error that was reported by the driver to the caller.
+ * @param   uErrId         Unique error id representing the location in the driver.
+ * @param   cbDumpData     Number of bytes at pDumpData.
+ * @param   pDumpData      Pointer to data that will be added to the message (see 'details' tab).
+ */
+static void vboxNetLwfLogErrorEvent(NTSTATUS uErrCode, NTSTATUS uReturnedStatus, ULONG uErrId)
+{
+    /* Figure out how many modules are attached and if they are going to fit into the dump data. */
+    unsigned cMaxModules = (ERROR_LOG_MAXIMUM_SIZE - FIELD_OFFSET(IO_ERROR_LOG_PACKET, DumpData)) / sizeof(RTMAC);
+    unsigned cModules = 0;
+    PVBOXNETLWF_MODULE pModuleCtx;
+    NdisAcquireSpinLock(&g_VBoxNetLwfGlobals.Lock);
+    RTListForEach(&g_VBoxNetLwfGlobals.listModules, pModuleCtx, VBOXNETLWF_MODULE, node)
+        ++cModules;
+    NdisReleaseSpinLock(&g_VBoxNetLwfGlobals.Lock);
+    /* Prevent overflow */
+    if (cModules > cMaxModules)
+        cModules = cMaxModules;
+
+    /* DumpDataSize must be a multiple of sizeof(ULONG). */
+    unsigned cbDumpData = (cModules * sizeof(RTMAC) + 3) & ~3;
+    /* Prevent underflow */
+    unsigned cbTotal = RT_MAX(FIELD_OFFSET(IO_ERROR_LOG_PACKET, DumpData) + cbDumpData,
+                              sizeof(IO_ERROR_LOG_PACKET));
+
+    PIO_ERROR_LOG_PACKET pErrEntry;
+    pErrEntry = (PIO_ERROR_LOG_PACKET)IoAllocateErrorLogEntry(g_VBoxNetLwfGlobals.pDevObj,
+                                                              (UCHAR)cbTotal);
+    if (pErrEntry)
+    {
+        PRTMAC pDump = (PRTMAC)pErrEntry->DumpData;
+        /*
+         * Initialize the whole structure with zeros in case we are suddenly short
+         * of data because the list is empty or has become smaller.
+         */
+        memset(pErrEntry, 0, cbTotal);
+
+        NdisAcquireSpinLock(&g_VBoxNetLwfGlobals.Lock);
+        RTListForEach(&g_VBoxNetLwfGlobals.listModules, pModuleCtx, VBOXNETLWF_MODULE, node)
+        {
+            /* The list could have been modified while we were allocating the entry, rely on cModules instead! */
+            if (cModules-- == 0)
+                break;
+            *pDump++ = pModuleCtx->MacAddr;
+        }
+        NdisReleaseSpinLock(&g_VBoxNetLwfGlobals.Lock);
+
+        pErrEntry->DumpDataSize     = cbDumpData;
+        pErrEntry->ErrorCode        = uErrCode;
+        pErrEntry->UniqueErrorValue = uErrId;
+        pErrEntry->FinalStatus      = uReturnedStatus;
+        IoWriteErrorLogEntry(pErrEntry);
+    }
+    else
+    {
+        DbgPrint("Failed to allocate error log entry (cb=%u)\n", cbTotal);
+    }
+}
+
+#ifdef DEBUG
+
+static const char *vboxNetLwfWinStatusToText(NDIS_STATUS code)
+{
+    switch (code)
+    {
+        case NDIS_STATUS_MEDIA_CONNECT: return "NDIS_STATUS_MEDIA_CONNECT";
+        case NDIS_STATUS_MEDIA_DISCONNECT: return "NDIS_STATUS_MEDIA_DISCONNECT";
+        case NDIS_STATUS_RESET_START: return "NDIS_STATUS_RESET_START";
+        case NDIS_STATUS_RESET_END: return "NDIS_STATUS_RESET_END";
+        case NDIS_STATUS_MEDIA_BUSY: return "NDIS_STATUS_MEDIA_BUSY";
+        case NDIS_STATUS_MEDIA_SPECIFIC_INDICATION: return "NDIS_STATUS_MEDIA_SPECIFIC_INDICATION";
+        case NDIS_STATUS_LINK_SPEED_CHANGE: return "NDIS_STATUS_LINK_SPEED_CHANGE";
+        case NDIS_STATUS_LINK_STATE: return "NDIS_STATUS_LINK_STATE";
+        case NDIS_STATUS_PORT_STATE: return "NDIS_STATUS_PORT_STATE";
+        case NDIS_STATUS_OPER_STATUS: return "NDIS_STATUS_OPER_STATUS";
+        case NDIS_STATUS_NETWORK_CHANGE: return "NDIS_STATUS_NETWORK_CHANGE";
+        case NDIS_STATUS_PACKET_FILTER: return "NDIS_STATUS_PACKET_FILTER";
+        case NDIS_STATUS_TASK_OFFLOAD_CURRENT_CONFIG: return "NDIS_STATUS_TASK_OFFLOAD_CURRENT_CONFIG";
+        case NDIS_STATUS_TASK_OFFLOAD_HARDWARE_CAPABILITIES: return "NDIS_STATUS_TASK_OFFLOAD_HARDWARE_CAPABILITIES";
+        case NDIS_STATUS_OFFLOAD_ENCASPULATION_CHANGE: return "NDIS_STATUS_OFFLOAD_ENCASPULATION_CHANGE";
+        case NDIS_STATUS_TCP_CONNECTION_OFFLOAD_HARDWARE_CAPABILITIES: return "NDIS_STATUS_TCP_CONNECTION_OFFLOAD_HARDWARE_CAPABILITIES";
+    }
+    return "unknown";
+}
+
+static void vboxNetLwfWinDumpFilterTypes(ULONG uFlags)
+{
+    if (uFlags & NDIS_PACKET_TYPE_DIRECTED) Log5(("   NDIS_PACKET_TYPE_DIRECTED\n"));
+    if (uFlags & NDIS_PACKET_TYPE_MULTICAST) Log5(("   NDIS_PACKET_TYPE_MULTICAST\n"));
+    if (uFlags & NDIS_PACKET_TYPE_ALL_MULTICAST) Log5(("   NDIS_PACKET_TYPE_ALL_MULTICAST\n"));
+    if (uFlags & NDIS_PACKET_TYPE_BROADCAST) Log5(("   NDIS_PACKET_TYPE_BROADCAST\n"));
+    if (uFlags & NDIS_PACKET_TYPE_PROMISCUOUS) Log5(("   NDIS_PACKET_TYPE_PROMISCUOUS\n"));
+    if (uFlags & NDIS_PACKET_TYPE_ALL_FUNCTIONAL) Log5(("   NDIS_PACKET_TYPE_ALL_FUNCTIONAL\n"));
+    if (uFlags & NDIS_PACKET_TYPE_ALL_LOCAL) Log5(("   NDIS_PACKET_TYPE_ALL_LOCAL\n"));
+    if (uFlags & NDIS_PACKET_TYPE_FUNCTIONAL) Log5(("   NDIS_PACKET_TYPE_FUNCTIONAL\n"));
+    if (uFlags & NDIS_PACKET_TYPE_GROUP) Log5(("   NDIS_PACKET_TYPE_GROUP\n"));
+    if (uFlags & NDIS_PACKET_TYPE_MAC_FRAME) Log5(("   NDIS_PACKET_TYPE_MAC_FRAME\n"));
+    if (uFlags & NDIS_PACKET_TYPE_SMT) Log5(("   NDIS_PACKET_TYPE_SMT\n"));
+    if (uFlags & NDIS_PACKET_TYPE_SOURCE_ROUTING) Log5(("   NDIS_PACKET_TYPE_SOURCE_ROUTING\n"));
+    if (uFlags == 0) Log5(("   NONE\n"));
+}
+
+DECLINLINE(void) vboxNetLwfWinDumpEncapsulation(const char *pcszText, ULONG uEncapsulation)
+{
+    if (uEncapsulation == NDIS_ENCAPSULATION_NOT_SUPPORTED)
+        Log5(("%s not supported\n", pcszText));
+    else
+    {
+        Log5(("%s", pcszText));
+        if (uEncapsulation & NDIS_ENCAPSULATION_NULL)
+            Log5((" null"));
+        if (uEncapsulation & NDIS_ENCAPSULATION_IEEE_802_3)
+            Log5((" 802.3"));
+        if (uEncapsulation & NDIS_ENCAPSULATION_IEEE_802_3_P_AND_Q)
+            Log5((" 802.3pq"));
+        if (uEncapsulation & NDIS_ENCAPSULATION_IEEE_802_3_P_AND_Q_IN_OOB)
+            Log5((" 802.3pq(oob)"));
+        if (uEncapsulation & NDIS_ENCAPSULATION_IEEE_LLC_SNAP_ROUTED)
+            Log5((" LLC"));
+        Log5(("\n"));
+    }
+}
+
+DECLINLINE(const char *) vboxNetLwfWinSetOnOffText(ULONG uOnOff)
+{
+    switch (uOnOff)
+    {
+        case NDIS_OFFLOAD_SET_NO_CHANGE: return "no change";
+        case NDIS_OFFLOAD_SET_ON: return "on";
+        case NDIS_OFFLOAD_SET_OFF: return "off";
+    }
+    return "unknown";
+}
+
+DECLINLINE(const char *) vboxNetLwfWinOnOffText(ULONG uOnOff)
+{
+    switch (uOnOff)
+    {
+        case NDIS_OFFLOAD_NOT_SUPPORTED: return "off";
+        case NDIS_OFFLOAD_SUPPORTED: return "on";
+    }
+    return "unknown";
+}
+
+DECLINLINE(const char *) vboxNetLwfWinSupportedText(ULONG uSupported)
+{
+    switch (uSupported)
+    {
+        case NDIS_OFFLOAD_NOT_SUPPORTED: return "not supported";
+        case NDIS_OFFLOAD_SUPPORTED: return "supported";
+    }
+    return "unknown";
+}
+
+static void vboxNetLwfWinDumpSetOffloadSettings(PNDIS_OFFLOAD pOffloadConfig)
+{
+    vboxNetLwfWinDumpEncapsulation("   Checksum.IPv4Transmit.Encapsulation               =", pOffloadConfig->Checksum.IPv4Transmit.Encapsulation);
+    Log5(("   Checksum.IPv4Transmit.IpOptionsSupported          = %s\n", vboxNetLwfWinSetOnOffText(pOffloadConfig->Checksum.IPv4Transmit.IpOptionsSupported)));
+    Log5(("   Checksum.IPv4Transmit.TcpOptionsSupported         = %s\n", vboxNetLwfWinSetOnOffText(pOffloadConfig->Checksum.IPv4Transmit.TcpOptionsSupported)));
+    Log5(("   Checksum.IPv4Transmit.TcpChecksum                 = %s\n", vboxNetLwfWinSetOnOffText(pOffloadConfig->Checksum.IPv4Transmit.TcpChecksum)));
+    Log5(("   Checksum.IPv4Transmit.UdpChecksum                 = %s\n", vboxNetLwfWinSetOnOffText(pOffloadConfig->Checksum.IPv4Transmit.UdpChecksum)));
+    Log5(("   Checksum.IPv4Transmit.IpChecksum                  = %s\n", vboxNetLwfWinSetOnOffText(pOffloadConfig->Checksum.IPv4Transmit.IpChecksum)));
+    vboxNetLwfWinDumpEncapsulation("   Checksum.IPv4Receive.Encapsulation                =", pOffloadConfig->Checksum.IPv4Receive.Encapsulation);
+    Log5(("   Checksum.IPv4Receive.IpOptionsSupported           = %s\n", vboxNetLwfWinSetOnOffText(pOffloadConfig->Checksum.IPv4Receive.IpOptionsSupported)));
+    Log5(("   Checksum.IPv4Receive.TcpOptionsSupported          = %s\n", vboxNetLwfWinSetOnOffText(pOffloadConfig->Checksum.IPv4Receive.TcpOptionsSupported)));
+    Log5(("   Checksum.IPv4Receive.TcpChecksum                  = %s\n", vboxNetLwfWinSetOnOffText(pOffloadConfig->Checksum.IPv4Receive.TcpChecksum)));
+    Log5(("   Checksum.IPv4Receive.UdpChecksum                  = %s\n", vboxNetLwfWinSetOnOffText(pOffloadConfig->Checksum.IPv4Receive.UdpChecksum)));
+    Log5(("   Checksum.IPv4Receive.IpChecksum                   = %s\n", vboxNetLwfWinSetOnOffText(pOffloadConfig->Checksum.IPv4Receive.IpChecksum)));
+    vboxNetLwfWinDumpEncapsulation("   Checksum.IPv6Transmit.Encapsulation               =", pOffloadConfig->Checksum.IPv6Transmit.Encapsulation);
+    Log5(("   Checksum.IPv6Transmit.IpExtensionHeadersSupported = %s\n", vboxNetLwfWinSetOnOffText(pOffloadConfig->Checksum.IPv6Transmit.IpExtensionHeadersSupported)));
+    Log5(("   Checksum.IPv6Transmit.TcpOptionsSupported         = %s\n", vboxNetLwfWinSetOnOffText(pOffloadConfig->Checksum.IPv6Transmit.TcpOptionsSupported)));
+    Log5(("   Checksum.IPv6Transmit.TcpChecksum                 = %s\n", vboxNetLwfWinSetOnOffText(pOffloadConfig->Checksum.IPv6Transmit.TcpChecksum)));
+    Log5(("   Checksum.IPv6Transmit.UdpChecksum                 = %s\n", vboxNetLwfWinSetOnOffText(pOffloadConfig->Checksum.IPv6Transmit.UdpChecksum)));
+    vboxNetLwfWinDumpEncapsulation("   Checksum.IPv6Receive.Encapsulation                =", pOffloadConfig->Checksum.IPv6Receive.Encapsulation);
+    Log5(("   Checksum.IPv6Receive.IpExtensionHeadersSupported  = %s\n", vboxNetLwfWinSetOnOffText(pOffloadConfig->Checksum.IPv6Receive.IpExtensionHeadersSupported)));
+    Log5(("   Checksum.IPv6Receive.TcpOptionsSupported          = %s\n", vboxNetLwfWinSetOnOffText(pOffloadConfig->Checksum.IPv6Receive.TcpOptionsSupported)));
+    Log5(("   Checksum.IPv6Receive.TcpChecksum                  = %s\n", vboxNetLwfWinSetOnOffText(pOffloadConfig->Checksum.IPv6Receive.TcpChecksum)));
+    Log5(("   Checksum.IPv6Receive.UdpChecksum                  = %s\n", vboxNetLwfWinSetOnOffText(pOffloadConfig->Checksum.IPv6Receive.UdpChecksum)));
+    vboxNetLwfWinDumpEncapsulation("   LsoV1.IPv4.Encapsulation                          =", pOffloadConfig->LsoV1.IPv4.Encapsulation);
+    Log5(("   LsoV1.IPv4.TcpOptions                             = %s\n", vboxNetLwfWinSupportedText(pOffloadConfig->LsoV1.IPv4.TcpOptions)));
+    Log5(("   LsoV1.IPv4.IpOptions                              = %s\n", vboxNetLwfWinSupportedText(pOffloadConfig->LsoV1.IPv4.IpOptions)));
+    vboxNetLwfWinDumpEncapsulation("   LsoV2.IPv4.Encapsulation                          =", pOffloadConfig->LsoV2.IPv4.Encapsulation);
+    vboxNetLwfWinDumpEncapsulation("   LsoV2.IPv6.Encapsulation                          =", pOffloadConfig->LsoV2.IPv6.Encapsulation);
+    Log5(("   LsoV2.IPv6.IpExtensionHeadersSupported            = %s\n", vboxNetLwfWinSupportedText(pOffloadConfig->LsoV2.IPv6.IpExtensionHeadersSupported)));
+    Log5(("   LsoV2.IPv6.TcpOptionsSupported                    = %s\n", vboxNetLwfWinSupportedText(pOffloadConfig->LsoV2.IPv6.TcpOptionsSupported)));
+}
+
+static void vboxNetLwfWinDumpOffloadSettings(PNDIS_OFFLOAD pOffloadConfig)
+{
+    vboxNetLwfWinDumpEncapsulation("   Checksum.IPv4Transmit.Encapsulation               =", pOffloadConfig->Checksum.IPv4Transmit.Encapsulation);
+    Log5(("   Checksum.IPv4Transmit.IpOptionsSupported          = %s\n", vboxNetLwfWinOnOffText(pOffloadConfig->Checksum.IPv4Transmit.IpOptionsSupported)));
+    Log5(("   Checksum.IPv4Transmit.TcpOptionsSupported         = %s\n", vboxNetLwfWinOnOffText(pOffloadConfig->Checksum.IPv4Transmit.TcpOptionsSupported)));
+    Log5(("   Checksum.IPv4Transmit.TcpChecksum                 = %s\n", vboxNetLwfWinOnOffText(pOffloadConfig->Checksum.IPv4Transmit.TcpChecksum)));
+    Log5(("   Checksum.IPv4Transmit.UdpChecksum                 = %s\n", vboxNetLwfWinOnOffText(pOffloadConfig->Checksum.IPv4Transmit.UdpChecksum)));
+    Log5(("   Checksum.IPv4Transmit.IpChecksum                  = %s\n", vboxNetLwfWinOnOffText(pOffloadConfig->Checksum.IPv4Transmit.IpChecksum)));
+    vboxNetLwfWinDumpEncapsulation("   Checksum.IPv4Receive.Encapsulation                =", pOffloadConfig->Checksum.IPv4Receive.Encapsulation);
+    Log5(("   Checksum.IPv4Receive.IpOptionsSupported           = %s\n", vboxNetLwfWinOnOffText(pOffloadConfig->Checksum.IPv4Receive.IpOptionsSupported)));
+    Log5(("   Checksum.IPv4Receive.TcpOptionsSupported          = %s\n", vboxNetLwfWinOnOffText(pOffloadConfig->Checksum.IPv4Receive.TcpOptionsSupported)));
+    Log5(("   Checksum.IPv4Receive.TcpChecksum                  = %s\n", vboxNetLwfWinOnOffText(pOffloadConfig->Checksum.IPv4Receive.TcpChecksum)));
+    Log5(("   Checksum.IPv4Receive.UdpChecksum                  = %s\n", vboxNetLwfWinOnOffText(pOffloadConfig->Checksum.IPv4Receive.UdpChecksum)));
+    Log5(("   Checksum.IPv4Receive.IpChecksum                   = %s\n", vboxNetLwfWinOnOffText(pOffloadConfig->Checksum.IPv4Receive.IpChecksum)));
+    vboxNetLwfWinDumpEncapsulation("   Checksum.IPv6Transmit.Encapsulation               =", pOffloadConfig->Checksum.IPv6Transmit.Encapsulation);
+    Log5(("   Checksum.IPv6Transmit.IpExtensionHeadersSupported = %s\n", vboxNetLwfWinOnOffText(pOffloadConfig->Checksum.IPv6Transmit.IpExtensionHeadersSupported)));
+    Log5(("   Checksum.IPv6Transmit.TcpOptionsSupported         = %s\n", vboxNetLwfWinOnOffText(pOffloadConfig->Checksum.IPv6Transmit.TcpOptionsSupported)));
+    Log5(("   Checksum.IPv6Transmit.TcpChecksum                 = %s\n", vboxNetLwfWinOnOffText(pOffloadConfig->Checksum.IPv6Transmit.TcpChecksum)));
+    Log5(("   Checksum.IPv6Transmit.UdpChecksum                 = %s\n", vboxNetLwfWinOnOffText(pOffloadConfig->Checksum.IPv6Transmit.UdpChecksum)));
+    vboxNetLwfWinDumpEncapsulation("   Checksum.IPv6Receive.Encapsulation                =", pOffloadConfig->Checksum.IPv6Receive.Encapsulation);
+    Log5(("   Checksum.IPv6Receive.IpExtensionHeadersSupported  = %s\n", vboxNetLwfWinOnOffText(pOffloadConfig->Checksum.IPv6Receive.IpExtensionHeadersSupported)));
+    Log5(("   Checksum.IPv6Receive.TcpOptionsSupported          = %s\n", vboxNetLwfWinOnOffText(pOffloadConfig->Checksum.IPv6Receive.TcpOptionsSupported)));
+    Log5(("   Checksum.IPv6Receive.TcpChecksum                  = %s\n", vboxNetLwfWinOnOffText(pOffloadConfig->Checksum.IPv6Receive.TcpChecksum)));
+    Log5(("   Checksum.IPv6Receive.UdpChecksum                  = %s\n", vboxNetLwfWinOnOffText(pOffloadConfig->Checksum.IPv6Receive.UdpChecksum)));
+    vboxNetLwfWinDumpEncapsulation("   LsoV1.IPv4.Encapsulation                          =", pOffloadConfig->LsoV1.IPv4.Encapsulation);
+    Log5(("   LsoV1.IPv4.TcpOptions                             = %s\n", vboxNetLwfWinSupportedText(pOffloadConfig->LsoV1.IPv4.TcpOptions)));
+    Log5(("   LsoV1.IPv4.IpOptions                              = %s\n", vboxNetLwfWinSupportedText(pOffloadConfig->LsoV1.IPv4.IpOptions)));
+    vboxNetLwfWinDumpEncapsulation("   LsoV2.IPv4.Encapsulation                          =", pOffloadConfig->LsoV2.IPv4.Encapsulation);
+    vboxNetLwfWinDumpEncapsulation("   LsoV2.IPv6.Encapsulation                          =", pOffloadConfig->LsoV2.IPv6.Encapsulation);
+    Log5(("   LsoV2.IPv6.IpExtensionHeadersSupported            = %s\n", vboxNetLwfWinSupportedText(pOffloadConfig->LsoV2.IPv6.IpExtensionHeadersSupported)));
+    Log5(("   LsoV2.IPv6.TcpOptionsSupported                    = %s\n", vboxNetLwfWinSupportedText(pOffloadConfig->LsoV2.IPv6.TcpOptionsSupported)));
+}
+
+static const char *vboxNetLwfWinStateToText(uint32_t enmState)
+{
+    switch (enmState)
+    {
+        case LwfState_Detached: return "Detached";
+        case LwfState_Attaching: return "Attaching";
+        case LwfState_Paused: return "Paused";
+        case LwfState_Restarting: return "Restarting";
+        case LwfState_Running: return "Running";
+        case LwfState_Pausing: return "Pausing";
+    }
+    return "invalid";
+}
+
+static void vboxNetLwfWinDumpPackets(const char *pszMsg, PNET_BUFFER_LIST pBufLists)
+{
+    for (PNET_BUFFER_LIST pList = pBufLists; pList; pList = NET_BUFFER_LIST_NEXT_NBL(pList))
+    {
+        for (PNET_BUFFER pBuf = NET_BUFFER_LIST_FIRST_NB(pList); pBuf; pBuf = NET_BUFFER_NEXT_NB(pBuf))
+        {
+            Log6(("%s packet: src=%p cb=%d offset=%d", pszMsg, pList->SourceHandle, NET_BUFFER_DATA_LENGTH(pBuf), NET_BUFFER_DATA_OFFSET(pBuf)));
+            for (PMDL pMdl = NET_BUFFER_FIRST_MDL(pBuf);
+                 pMdl != NULL;
+                 pMdl = NDIS_MDL_LINKAGE(pMdl))
+            {
+                Log6((" MDL: cb=%d", MmGetMdlByteCount(pMdl)));
+            }
+            Log6(("\n"));
+        }
+    }
+}
+
+DECLINLINE(const char *) vboxNetLwfWinEthTypeStr(uint16_t uType)
+{
+    switch (uType)
+    {
+        case RTNET_ETHERTYPE_IPV4: return "IP";
+        case RTNET_ETHERTYPE_IPV6: return "IPv6";
+        case RTNET_ETHERTYPE_ARP:  return "ARP";
+    }
+    return "unknown";
+}
+
+#define VBOXNETLWF_PKTDMPSIZE 0x50
+
+/**
+ * Dump a packet to debug log.
+ *
+ * @param   cpPacket    The packet.
+ * @param   cb          The size of the packet.
+ * @param   cszText     A string denoting direction of packet transfer.
+ */
+DECLINLINE(void) vboxNetLwfWinDumpPacket(PCINTNETSG pSG, const char *cszText)
+{
+    uint8_t bPacket[VBOXNETLWF_PKTDMPSIZE];
+
+    uint32_t cb = pSG->cbTotal < VBOXNETLWF_PKTDMPSIZE ? pSG->cbTotal : VBOXNETLWF_PKTDMPSIZE;
+    IntNetSgReadEx(pSG, 0, cb, bPacket);
+
+    AssertReturnVoid(cb >= 14);
+
+    uint8_t *pHdr = bPacket;
+    uint8_t *pEnd = bPacket + cb;
+    AssertReturnVoid(pEnd - pHdr >= 14);
+    uint16_t uEthType = RT_N2H_U16(*(uint16_t*)(pHdr+12));
+    Log2(("NetLWF: %s (%d bytes), %RTmac => %RTmac, EthType=%s(0x%x)\n",
+          cszText, pSG->cbTotal, pHdr+6, pHdr, vboxNetLwfWinEthTypeStr(uEthType), uEthType));
+    pHdr += sizeof(RTNETETHERHDR);
+    if (uEthType == RTNET_ETHERTYPE_VLAN)
+    {
+        AssertReturnVoid(pEnd - pHdr >= 4);
+        uEthType = RT_N2H_U16(*(uint16_t*)(pHdr+2));
+        Log2((" + VLAN: id=%d EthType=%s(0x%x)\n", RT_N2H_U16(*(uint16_t*)(pHdr)) & 0xFFF,
+              vboxNetLwfWinEthTypeStr(uEthType), uEthType));
+        pHdr += 2 * sizeof(uint16_t);
+    }
+    uint8_t uProto = 0xFF;
+    switch (uEthType)
+    {
+        case RTNET_ETHERTYPE_IPV6:
+            AssertReturnVoid(pEnd - pHdr >= 40);
+            uProto = pHdr[6];
+            Log2((" + IPv6: %RTnaipv6 => %RTnaipv6\n", pHdr+8, pHdr+24));
+            pHdr += 40;
+            break;
+        case RTNET_ETHERTYPE_IPV4:
+            AssertReturnVoid(pEnd - pHdr >= 20);
+            uProto = pHdr[9];
+            Log2((" + IP: %RTnaipv4 => %RTnaipv4\n", *(uint32_t*)(pHdr+12), *(uint32_t*)(pHdr+16)));
+            pHdr += (pHdr[0] & 0xF) * 4;
+            break;
+        case RTNET_ETHERTYPE_ARP:
+            AssertReturnVoid(pEnd - pHdr >= 28);
+            AssertReturnVoid(RT_N2H_U16(*(uint16_t*)(pHdr+2)) == RTNET_ETHERTYPE_IPV4);
+            switch (RT_N2H_U16(*(uint16_t*)(pHdr+6)))
+            {
+                case 1: /* ARP request */
+                    Log2((" + ARP-REQ: who-has %RTnaipv4 tell %RTnaipv4\n",
+                          *(uint32_t*)(pHdr+24), *(uint32_t*)(pHdr+14)));
+                    break;
+                case 2: /* ARP reply */
+                    Log2((" + ARP-RPL: %RTnaipv4 is-at %RTmac\n",
+                          *(uint32_t*)(pHdr+14), pHdr+8));
+                    break;
+                default:
+                    Log2((" + ARP: unknown op %d\n", RT_N2H_U16(*(uint16_t*)(pHdr+6))));
+                    break;
+            }
+            break;
+        /* There is no default case as uProto is initialized with 0xFF */
+    }
+    while (uProto != 0xFF)
+    {
+        switch (uProto)
+        {
+            case 0:  /* IPv6 Hop-by-Hop option*/
+            case 60: /* IPv6 Destination option*/
+            case 43: /* IPv6 Routing option */
+            case 44: /* IPv6 Fragment option */
+                Log2((" + IPv6 option (%d): <not implemented>\n", uProto));
+                uProto = pHdr[0];
+                pHdr += pHdr[1] * 8 + 8; /* Skip to the next extension/protocol */
+                break;
+            case 51: /* IPv6 IPsec AH */
+                Log2((" + IPv6 IPsec AH: <not implemented>\n"));
+                uProto = pHdr[0];
+                pHdr += (pHdr[1] + 2) * 4; /* Skip to the next extension/protocol */
+                break;
+            case 50: /* IPv6 IPsec ESP */
+                /* Cannot decode IPsec, fall through */
+                Log2((" + IPv6 IPsec ESP: <not implemented>\n"));
+                uProto = 0xFF;
+                break;
+            case 59: /* No Next Header */
+                Log2((" + IPv6 No Next Header\n"));
+                uProto = 0xFF;
+                break;
+            case 58: /* IPv6-ICMP */
+                switch (pHdr[0])
+                {
+                    case 1:   Log2((" + IPv6-ICMP: destination unreachable, code %d\n", pHdr[1])); break;
+                    case 128: Log2((" + IPv6-ICMP: echo request\n")); break;
+                    case 129: Log2((" + IPv6-ICMP: echo reply\n")); break;
+                    default:  Log2((" + IPv6-ICMP: unknown type %d, code %d\n", pHdr[0], pHdr[1])); break;
+                }
+                uProto = 0xFF;
+                break;
+            case 1: /* ICMP */
+                switch (pHdr[0])
+                {
+                    case 0:  Log2((" + ICMP: echo reply\n")); break;
+                    case 8:  Log2((" + ICMP: echo request\n")); break;
+                    case 3:  Log2((" + ICMP: destination unreachable, code %d\n", pHdr[1])); break;
+                    default: Log2((" + ICMP: unknown type %d, code %d\n", pHdr[0], pHdr[1])); break;
+                }
+                uProto = 0xFF;
+                break;
+            case 6: /* TCP */
+                Log2((" + TCP: src=%d dst=%d seq=%x ack=%x\n",
+                      RT_N2H_U16(*(uint16_t*)(pHdr)), RT_N2H_U16(*(uint16_t*)(pHdr+2)),
+                      RT_N2H_U32(*(uint32_t*)(pHdr+4)), RT_N2H_U32(*(uint32_t*)(pHdr+8))));
+                uProto = 0xFF;
+                break;
+            case 17: /* UDP */
+                Log2((" + UDP: src=%d dst=%d\n",
+                      RT_N2H_U16(*(uint16_t*)(pHdr)), RT_N2H_U16(*(uint16_t*)(pHdr+2))));
+                uProto = 0xFF;
+                break;
+            default:
+                Log2((" + Unknown: proto=0x%x\n", uProto));
+                uProto = 0xFF;
+                break;
+        }
+    }
+    Log3(("%.*Rhxd\n", cb, bPacket));
+}
+
+#else /* !DEBUG */
+# define vboxNetLwfWinDumpFilterTypes(uFlags)    do { } while (0)
+# define vboxNetLwfWinDumpOffloadSettings(p)     do { } while (0)
+# define vboxNetLwfWinDumpSetOffloadSettings(p)  do { } while (0)
+# define vboxNetLwfWinDumpPackets(m,l)           do { } while (0)
+# define vboxNetLwfWinDumpPacket(p,t)            do { } while (0)
+#endif /* !DEBUG */
+
+DECLINLINE(bool) vboxNetLwfWinChangeState(PVBOXNETLWF_MODULE pModuleCtx, uint32_t enmNew, uint32_t enmOld = LwfState_32BitHack)
+{
+    AssertReturn(pModuleCtx, false);
+
+    bool fSuccess = true;
+    if (enmOld != LwfState_32BitHack)
+    {
+        fSuccess = ASMAtomicCmpXchgU32(&pModuleCtx->enmState, enmNew, enmOld);
+        if (fSuccess)
+            Log(("vboxNetLwfWinChangeState: state change %s -> %s\n",
+                 vboxNetLwfWinStateToText(enmOld),
+                 vboxNetLwfWinStateToText(enmNew)));
+        else
+            Log(("ERROR! vboxNetLwfWinChangeState: failed state change %s (actual=%s) -> %s\n",
+                 vboxNetLwfWinStateToText(enmOld),
+                 vboxNetLwfWinStateToText(ASMAtomicReadU32(&pModuleCtx->enmState)),
+                 vboxNetLwfWinStateToText(enmNew)));
+        Assert(fSuccess);
+    }
+    else
+    {
+        uint32_t enmPrevState = ASMAtomicXchgU32(&pModuleCtx->enmState, enmNew);
+        Log(("vboxNetLwfWinChangeState: state change %s -> %s\n",
+             vboxNetLwfWinStateToText(enmPrevState),
+             vboxNetLwfWinStateToText(enmNew)));
+        NOREF(enmPrevState);
+    }
+    return fSuccess;
+}
+
+DECLINLINE(void) vboxNetLwfWinInitOidRequest(PVBOXNETLWF_OIDREQ pRequest)
+{
+    NdisZeroMemory(pRequest, sizeof(VBOXNETLWF_OIDREQ));
+
+    NdisInitializeEvent(&pRequest->Event);
+
+    pRequest->Request.Header.Type = NDIS_OBJECT_TYPE_OID_REQUEST;
+    pRequest->Request.Header.Revision = NDIS_OID_REQUEST_REVISION_1;
+    pRequest->Request.Header.Size = NDIS_SIZEOF_OID_REQUEST_REVISION_1;
+
+    pRequest->Request.RequestId = (PVOID)VBOXNETLWF_REQ_ID;
+}
+
+static NDIS_STATUS vboxNetLwfWinSyncOidRequest(PVBOXNETLWF_MODULE pModuleCtx, PVBOXNETLWF_OIDREQ pRequest)
+{
+    NDIS_STATUS Status = NdisFOidRequest(pModuleCtx->hFilter, &pRequest->Request);
+    if (Status == NDIS_STATUS_PENDING)
+    {
+        NdisWaitEvent(&pRequest->Event, 0);
+        Status = pRequest->Status;
+    }
+    return Status;
+}
+
+DECLINLINE(void) vboxNetLwfWinCopyOidRequestResults(PNDIS_OID_REQUEST pFrom, PNDIS_OID_REQUEST pTo)
+{
+    switch (pFrom->RequestType)
+    {
+        case NdisRequestSetInformation:
+            pTo->DATA.SET_INFORMATION.BytesRead   = pFrom->DATA.SET_INFORMATION.BytesRead;
+            pTo->DATA.SET_INFORMATION.BytesNeeded = pFrom->DATA.SET_INFORMATION.BytesNeeded;
+            break;
+        case NdisRequestMethod:
+            pTo->DATA.METHOD_INFORMATION.OutputBufferLength = pFrom->DATA.METHOD_INFORMATION.OutputBufferLength;
+            pTo->DATA.METHOD_INFORMATION.BytesWritten       = pFrom->DATA.METHOD_INFORMATION.BytesWritten;
+            pTo->DATA.METHOD_INFORMATION.BytesRead          = pFrom->DATA.METHOD_INFORMATION.BytesRead;
+            pTo->DATA.METHOD_INFORMATION.BytesNeeded        = pFrom->DATA.METHOD_INFORMATION.BytesNeeded;
+            break;
+        case NdisRequestQueryInformation:
+        case NdisRequestQueryStatistics:
+        default:
+            pTo->DATA.QUERY_INFORMATION.BytesWritten = pFrom->DATA.QUERY_INFORMATION.BytesWritten;
+            pTo->DATA.QUERY_INFORMATION.BytesNeeded  = pFrom->DATA.QUERY_INFORMATION.BytesNeeded;
+    }
+}
+
+void inline vboxNetLwfWinOverridePacketFiltersUp(PVBOXNETLWF_MODULE pModuleCtx, ULONG *pFilters)
+{
+    if (ASMAtomicReadBool(&pModuleCtx->fActive) && !ASMAtomicReadBool(&pModuleCtx->fHostPromisc))
+        *pFilters &= ~NDIS_PACKET_TYPE_PROMISCUOUS;
+}
+
+NDIS_STATUS vboxNetLwfWinOidRequest(IN NDIS_HANDLE hModuleCtx,
+                                    IN PNDIS_OID_REQUEST pOidRequest)
+{
+    LogFlow(("==>vboxNetLwfWinOidRequest: module=%p\n", hModuleCtx));
+    vboxNetCmnWinDumpOidRequest(__FUNCTION__, pOidRequest);
+    PVBOXNETLWF_MODULE pModuleCtx = (PVBOXNETLWF_MODULE)hModuleCtx;
+    PNDIS_OID_REQUEST pClone = NULL;
+    NDIS_STATUS Status = NdisAllocateCloneOidRequest(pModuleCtx->hFilter,
+                                                     pOidRequest,
+                                                     VBOXNETLWF_MEM_TAG,
+                                                     &pClone);
+    if (Status == NDIS_STATUS_SUCCESS)
+    {
+        /* Save the pointer to the original */
+        *((PNDIS_OID_REQUEST*)(pClone->SourceReserved)) = pOidRequest;
+
+        pClone->RequestId = pOidRequest->RequestId;
+        /* We are not supposed to get another request until we are through with the one we "postponed" */
+        PNDIS_OID_REQUEST pPrev = ASMAtomicXchgPtrT(&pModuleCtx->pPendingRequest, pClone, PNDIS_OID_REQUEST);
+        Assert(pPrev == NULL);
+        pModuleCtx->pPendingRequest = pClone;
+        if (pOidRequest->RequestType == NdisRequestSetInformation
+            && pOidRequest->DATA.SET_INFORMATION.Oid == OID_GEN_CURRENT_PACKET_FILTER)
+        {
+            ASMAtomicWriteBool(&pModuleCtx->fHostPromisc, !!(*(ULONG*)pOidRequest->DATA.SET_INFORMATION.InformationBuffer & NDIS_PACKET_TYPE_PROMISCUOUS));
+            Log(("vboxNetLwfWinOidRequest: host wanted to set packet filter value to:\n"));
+            vboxNetLwfWinDumpFilterTypes(*(ULONG*)pOidRequest->DATA.SET_INFORMATION.InformationBuffer);
+            /* Keep adapter in promisc mode as long as we are active. */
+            if (ASMAtomicReadBool(&pModuleCtx->fActive))
+                *(ULONG*)pClone->DATA.SET_INFORMATION.InformationBuffer |= NDIS_PACKET_TYPE_PROMISCUOUS;
+            Log5(("vboxNetLwfWinOidRequest: pass the following packet filters to miniport:\n"));
+            vboxNetLwfWinDumpFilterTypes(*(ULONG*)pOidRequest->DATA.SET_INFORMATION.InformationBuffer);
+        }
+        if (pOidRequest->RequestType == NdisRequestSetInformation
+            && pOidRequest->DATA.SET_INFORMATION.Oid == OID_TCP_OFFLOAD_CURRENT_CONFIG)
+        {
+            Log5(("vboxNetLwfWinOidRequest: offloading set to:\n"));
+            vboxNetLwfWinDumpSetOffloadSettings((PNDIS_OFFLOAD)pOidRequest->DATA.SET_INFORMATION.InformationBuffer);
+        }
+
+        /* Forward the clone to underlying filters/miniport */
+        Status = NdisFOidRequest(pModuleCtx->hFilter, pClone);
+        if (Status != NDIS_STATUS_PENDING)
+        {
+            /* Synchronous completion */
+            pPrev = ASMAtomicXchgPtrT(&pModuleCtx->pPendingRequest, NULL, PNDIS_OID_REQUEST);
+            Assert(pPrev == pClone);
+            Log5(("vboxNetLwfWinOidRequest: got the following packet filters from miniport:\n"));
+            vboxNetLwfWinDumpFilterTypes(*(ULONG*)pOidRequest->DATA.QUERY_INFORMATION.InformationBuffer);
+            /*
+             * The host does not expect the adapter to be in promisc mode,
+             * unless it enabled the mode. Let's not disillusion it.
+             */
+            if (   pOidRequest->RequestType == NdisRequestQueryInformation
+                && pOidRequest->DATA.QUERY_INFORMATION.Oid == OID_GEN_CURRENT_PACKET_FILTER)
+                vboxNetLwfWinOverridePacketFiltersUp(pModuleCtx, (ULONG*)pOidRequest->DATA.QUERY_INFORMATION.InformationBuffer);
+            Log5(("vboxNetLwfWinOidRequest: reporting to the host the following packet filters:\n"));
+            vboxNetLwfWinDumpFilterTypes(*(ULONG*)pOidRequest->DATA.QUERY_INFORMATION.InformationBuffer);
+            vboxNetLwfWinCopyOidRequestResults(pClone, pOidRequest);
+            NdisFreeCloneOidRequest(pModuleCtx->hFilter, pClone);
+        }
+        /* In case of async completion we do the rest in vboxNetLwfWinOidRequestComplete() */
+    }
+    else
+    {
+        LogError(("vboxNetLwfWinOidRequest: NdisAllocateCloneOidRequest failed with 0x%x\n", Status));
+    }
+    LogFlow(("<==vboxNetLwfWinOidRequest: Status=0x%x\n", Status));
+    return Status;
+}
+
+VOID vboxNetLwfWinOidRequestComplete(IN NDIS_HANDLE hModuleCtx,
+                                     IN PNDIS_OID_REQUEST pRequest,
+                                     IN NDIS_STATUS Status)
+{
+    LogFlow(("==>vboxNetLwfWinOidRequestComplete: module=%p req=%p status=0x%x\n", hModuleCtx, pRequest, Status));
+    PVBOXNETLWF_MODULE pModuleCtx = (PVBOXNETLWF_MODULE)hModuleCtx;
+    PNDIS_OID_REQUEST pOriginal = *((PNDIS_OID_REQUEST*)(pRequest->SourceReserved));
+    if (pOriginal)
+    {
+        /* NDIS is supposed to serialize requests */
+        PNDIS_OID_REQUEST pPrev = ASMAtomicXchgPtrT(&pModuleCtx->pPendingRequest, NULL, PNDIS_OID_REQUEST);
+        Assert(pPrev == pRequest); NOREF(pPrev);
+
+        Log5(("vboxNetLwfWinOidRequestComplete: completed rq type=%d oid=%x\n", pRequest->RequestType, pRequest->DATA.QUERY_INFORMATION.Oid));
+        vboxNetLwfWinCopyOidRequestResults(pRequest, pOriginal);
+        if (   pRequest->RequestType == NdisRequestQueryInformation
+            && pRequest->DATA.QUERY_INFORMATION.Oid == OID_GEN_CURRENT_PACKET_FILTER)
+        {
+            Log5(("vboxNetLwfWinOidRequestComplete: underlying miniport reports its packet filters:\n"));
+            vboxNetLwfWinDumpFilterTypes(*(ULONG*)pRequest->DATA.QUERY_INFORMATION.InformationBuffer);
+            vboxNetLwfWinOverridePacketFiltersUp(pModuleCtx, (ULONG*)pRequest->DATA.QUERY_INFORMATION.InformationBuffer);
+            Log5(("vboxNetLwfWinOidRequestComplete: reporting the following packet filters to upper protocol:\n"));
+            vboxNetLwfWinDumpFilterTypes(*(ULONG*)pRequest->DATA.QUERY_INFORMATION.InformationBuffer);
+        }
+        NdisFreeCloneOidRequest(pModuleCtx->hFilter, pRequest);
+        NdisFOidRequestComplete(pModuleCtx->hFilter, pOriginal, Status);
+    }
+    else
+    {
+        /* This is not a clone, we originated it */
+        Log(("vboxNetLwfWinOidRequestComplete: locally originated request (%p) completed, status=0x%x\n", pRequest, Status));
+        PVBOXNETLWF_OIDREQ pRqWrapper = RT_FROM_MEMBER(pRequest, VBOXNETLWF_OIDREQ, Request);
+        pRqWrapper->Status = Status;
+        NdisSetEvent(&pRqWrapper->Event);
+    }
+    LogFlow(("<==vboxNetLwfWinOidRequestComplete\n"));
+}
+
+
+static bool vboxNetLwfWinIsPromiscuous(PVBOXNETLWF_MODULE pModuleCtx)
+{
+    return ASMAtomicReadBool(&pModuleCtx->fHostPromisc);
+}
+
+#if 0
+static NDIS_STATUS vboxNetLwfWinGetPacketFilter(PVBOXNETLWF_MODULE pModuleCtx)
+{
+    LogFlow(("==>vboxNetLwfWinGetPacketFilter: module=%p\n", pModuleCtx));
+    VBOXNETLWF_OIDREQ Rq;
+    vboxNetLwfWinInitOidRequest(&Rq);
+    Rq.Request.RequestType = NdisRequestQueryInformation;
+    Rq.Request.DATA.QUERY_INFORMATION.Oid = OID_GEN_CURRENT_PACKET_FILTER;
+    Rq.Request.DATA.QUERY_INFORMATION.InformationBuffer = &pModuleCtx->uPacketFilter;
+    Rq.Request.DATA.QUERY_INFORMATION.InformationBufferLength = sizeof(pModuleCtx->uPacketFilter);
+    NDIS_STATUS Status = vboxNetLwfWinSyncOidRequest(pModuleCtx, &Rq);
+    if (Status != NDIS_STATUS_SUCCESS)
+    {
+        LogError(("vboxNetLwfWinGetPacketFilter: vboxNetLwfWinSyncOidRequest(query, OID_GEN_CURRENT_PACKET_FILTER) failed with 0x%x\n", Status));
+        return FALSE;
+    }
+    if (Rq.Request.DATA.QUERY_INFORMATION.BytesWritten != sizeof(pModuleCtx->uPacketFilter))
+    {
+        LogError(("vboxNetLwfWinGetPacketFilter: vboxNetLwfWinSyncOidRequest(query, OID_GEN_CURRENT_PACKET_FILTER) failed to write neccessary amount (%d bytes), actually written %d bytes\n", sizeof(pModuleCtx->uPacketFilter), Rq.Request.DATA.QUERY_INFORMATION.BytesWritten));
+    }
+
+    Log5(("vboxNetLwfWinGetPacketFilter: OID_GEN_CURRENT_PACKET_FILTER query returned the following filters:\n"));
+    vboxNetLwfWinDumpFilterTypes(pModuleCtx->uPacketFilter);
+
+    LogFlow(("<==vboxNetLwfWinGetPacketFilter: status=0x%x\n", Status));
+    return Status;
+}
+#endif
+
+static NDIS_STATUS vboxNetLwfWinSetPacketFilter(PVBOXNETLWF_MODULE pModuleCtx, bool fPromisc)
+{
+    LogFlow(("==>vboxNetLwfWinSetPacketFilter: module=%p %s\n", pModuleCtx, fPromisc ? "promiscuous" : "normal"));
+    ULONG uFilter = 0;
+    VBOXNETLWF_OIDREQ Rq;
+    vboxNetLwfWinInitOidRequest(&Rq);
+    Rq.Request.RequestType = NdisRequestQueryInformation;
+    Rq.Request.DATA.QUERY_INFORMATION.Oid = OID_GEN_CURRENT_PACKET_FILTER;
+    Rq.Request.DATA.QUERY_INFORMATION.InformationBuffer = &uFilter;
+    Rq.Request.DATA.QUERY_INFORMATION.InformationBufferLength = sizeof(uFilter);
+    NDIS_STATUS Status = vboxNetLwfWinSyncOidRequest(pModuleCtx, &Rq);
+    if (Status != NDIS_STATUS_SUCCESS)
+    {
+        LogError(("vboxNetLwfWinSetPacketFilter: vboxNetLwfWinSyncOidRequest(query, OID_GEN_CURRENT_PACKET_FILTER) failed with 0x%x\n", Status));
+        return Status;
+    }
+    if (Rq.Request.DATA.QUERY_INFORMATION.BytesWritten != sizeof(uFilter))
+    {
+        LogError(("vboxNetLwfWinSetPacketFilter: vboxNetLwfWinSyncOidRequest(query, OID_GEN_CURRENT_PACKET_FILTER) failed to write neccessary amount (%d bytes), actually written %d bytes\n", sizeof(uFilter), Rq.Request.DATA.QUERY_INFORMATION.BytesWritten));
+        return NDIS_STATUS_FAILURE;
+    }
+
+    Log5(("vboxNetLwfWinSetPacketFilter: OID_GEN_CURRENT_PACKET_FILTER query returned the following filters:\n"));
+    vboxNetLwfWinDumpFilterTypes(uFilter);
+
+    if (fPromisc)
+    {
+        /* If we about to go promiscuous, save the state before we change it. */
+        ASMAtomicWriteBool(&pModuleCtx->fHostPromisc, !!(uFilter & NDIS_PACKET_TYPE_PROMISCUOUS));
+        uFilter |= NDIS_PACKET_TYPE_PROMISCUOUS;
+    }
+    else
+    {
+        /* Reset promisc only if it was not enabled before we had changed it. */
+        if (!ASMAtomicReadBool(&pModuleCtx->fHostPromisc))
+            uFilter &= ~NDIS_PACKET_TYPE_PROMISCUOUS;
+    }
+
+    Log5(("vboxNetLwfWinSetPacketFilter: OID_GEN_CURRENT_PACKET_FILTER about to set the following filters:\n"));
+    vboxNetLwfWinDumpFilterTypes(uFilter);
+
+    NdisResetEvent(&Rq.Event); /* need to reset as it has been set by query op */
+    Rq.Request.RequestType = NdisRequestSetInformation;
+    Rq.Request.DATA.SET_INFORMATION.Oid = OID_GEN_CURRENT_PACKET_FILTER;
+    Rq.Request.DATA.SET_INFORMATION.InformationBuffer = &uFilter;
+    Rq.Request.DATA.SET_INFORMATION.InformationBufferLength = sizeof(uFilter);
+    Status = vboxNetLwfWinSyncOidRequest(pModuleCtx, &Rq);
+    if (Status != NDIS_STATUS_SUCCESS)
+    {
+        LogError(("vboxNetLwfWinSetPacketFilter: vboxNetLwfWinSyncOidRequest(set, OID_GEN_CURRENT_PACKET_FILTER, vvv below vvv) failed with 0x%x\n", Status));
+        vboxNetLwfWinDumpFilterTypes(uFilter);
+    }
+    LogFlow(("<==vboxNetLwfWinSetPacketFilter: status=0x%x\n", Status));
+    return Status;
+}
+
+
+static NTSTATUS vboxNetLwfWinDevDispatch(IN PDEVICE_OBJECT pDevObj, IN PIRP pIrp)
+{
+    RT_NOREF1(pDevObj);
+    PIO_STACK_LOCATION pIrpSl = IoGetCurrentIrpStackLocation(pIrp);;
+    NTSTATUS Status = STATUS_SUCCESS;
+
+    switch (pIrpSl->MajorFunction)
+    {
+        case IRP_MJ_DEVICE_CONTROL:
+            Status = STATUS_NOT_SUPPORTED;
+            break;
+        case IRP_MJ_CREATE:
+        case IRP_MJ_CLEANUP:
+        case IRP_MJ_CLOSE:
+            break;
+        default:
+            AssertFailed();
+            break;
+    }
+
+    pIrp->IoStatus.Status = Status;
+    IoCompleteRequest(pIrp, IO_NO_INCREMENT);
+
+    return Status;
+}
+
+/** @todo So far we had no use for device, should we even bother to create it? */
+static NDIS_STATUS vboxNetLwfWinDevCreate(PVBOXNETLWFGLOBALS pGlobals)
+{
+    NDIS_STRING DevName, LinkName;
+    PDRIVER_DISPATCH aMajorFunctions[IRP_MJ_MAXIMUM_FUNCTION+1];
+    NdisInitUnicodeString(&DevName, VBOXNETLWF_NAME_DEVICE);
+    NdisInitUnicodeString(&LinkName, VBOXNETLWF_NAME_LINK);
+
+    Assert(!pGlobals->hDevice);
+    Assert(!pGlobals->pDevObj);
+    NdisZeroMemory(aMajorFunctions, sizeof (aMajorFunctions));
+    aMajorFunctions[IRP_MJ_CREATE] = vboxNetLwfWinDevDispatch;
+    aMajorFunctions[IRP_MJ_CLEANUP] = vboxNetLwfWinDevDispatch;
+    aMajorFunctions[IRP_MJ_CLOSE] = vboxNetLwfWinDevDispatch;
+    aMajorFunctions[IRP_MJ_DEVICE_CONTROL] = vboxNetLwfWinDevDispatch;
+
+    NDIS_DEVICE_OBJECT_ATTRIBUTES DeviceAttributes;
+    NdisZeroMemory(&DeviceAttributes, sizeof(DeviceAttributes));
+    DeviceAttributes.Header.Type = NDIS_OBJECT_TYPE_DEVICE_OBJECT_ATTRIBUTES;
+    DeviceAttributes.Header.Revision = NDIS_DEVICE_OBJECT_ATTRIBUTES_REVISION_1;
+    DeviceAttributes.Header.Size = sizeof(DeviceAttributes);
+    DeviceAttributes.DeviceName = &DevName;
+    DeviceAttributes.SymbolicName = &LinkName;
+    DeviceAttributes.MajorFunctions = aMajorFunctions;
+    //DeviceAttributes.ExtensionSize = sizeof(FILTER_DEVICE_EXTENSION);
+
+    NDIS_STATUS Status = NdisRegisterDeviceEx(pGlobals->hFilterDriver,
+                                              &DeviceAttributes,
+                                              &pGlobals->pDevObj,
+                                              &pGlobals->hDevice);
+    Log(("vboxNetLwfWinDevCreate: NdisRegisterDeviceEx returned 0x%x\n", Status));
+    Assert(Status == NDIS_STATUS_SUCCESS);
+#if 0
+    if (Status == NDIS_STATUS_SUCCESS)
+    {
+        PFILTER_DEVICE_EXTENSION pExtension;
+        pExtension = NdisGetDeviceReservedExtension(pGlobals->pDevObj);
+        pExtension->Signature = VBOXNETLWF_MEM_TAG;
+        pExtension->Handle = pGlobals->hFilterDriver;
+    }
+#endif
+    return Status;
+}
+
+static void vboxNetLwfWinDevDestroy(PVBOXNETLWFGLOBALS pGlobals)
+{
+    Assert(pGlobals->hDevice);
+    Assert(pGlobals->pDevObj);
+    NdisDeregisterDeviceEx(pGlobals->hDevice);
+    pGlobals->hDevice = NULL;
+    pGlobals->pDevObj = NULL;
+}
+
+static void vboxNetLwfWinDisableOffloading(PNDIS_OFFLOAD pOffloadConfig)
+{
+    pOffloadConfig->Checksum.IPv4Transmit.Encapsulation               = NDIS_ENCAPSULATION_NOT_SUPPORTED;
+    pOffloadConfig->Checksum.IPv4Transmit.IpOptionsSupported          = NDIS_OFFLOAD_NOT_SUPPORTED;
+    pOffloadConfig->Checksum.IPv4Transmit.TcpOptionsSupported         = NDIS_OFFLOAD_NOT_SUPPORTED;
+    pOffloadConfig->Checksum.IPv4Transmit.TcpChecksum                 = NDIS_OFFLOAD_NOT_SUPPORTED;
+    pOffloadConfig->Checksum.IPv4Transmit.UdpChecksum                 = NDIS_OFFLOAD_NOT_SUPPORTED;
+    pOffloadConfig->Checksum.IPv4Transmit.IpChecksum                  = NDIS_OFFLOAD_NOT_SUPPORTED;
+    pOffloadConfig->Checksum.IPv6Transmit.Encapsulation               = NDIS_ENCAPSULATION_NOT_SUPPORTED;
+    pOffloadConfig->Checksum.IPv6Transmit.IpExtensionHeadersSupported = NDIS_OFFLOAD_NOT_SUPPORTED;
+    pOffloadConfig->Checksum.IPv6Transmit.TcpOptionsSupported         = NDIS_OFFLOAD_NOT_SUPPORTED;
+    pOffloadConfig->Checksum.IPv6Transmit.TcpChecksum                 = NDIS_OFFLOAD_NOT_SUPPORTED;
+    pOffloadConfig->Checksum.IPv6Transmit.UdpChecksum                 = NDIS_OFFLOAD_NOT_SUPPORTED;
+    pOffloadConfig->LsoV1.IPv4.Encapsulation                          = NDIS_ENCAPSULATION_NOT_SUPPORTED;
+    pOffloadConfig->LsoV1.IPv4.TcpOptions                             = NDIS_OFFLOAD_NOT_SUPPORTED;
+    pOffloadConfig->LsoV1.IPv4.IpOptions                              = NDIS_OFFLOAD_NOT_SUPPORTED;
+    pOffloadConfig->LsoV2.IPv4.Encapsulation                          = NDIS_ENCAPSULATION_NOT_SUPPORTED;
+    pOffloadConfig->LsoV2.IPv6.Encapsulation                          = NDIS_ENCAPSULATION_NOT_SUPPORTED;
+    pOffloadConfig->LsoV2.IPv6.IpExtensionHeadersSupported            = NDIS_OFFLOAD_NOT_SUPPORTED;
+    pOffloadConfig->LsoV2.IPv6.TcpOptionsSupported                    = NDIS_OFFLOAD_NOT_SUPPORTED;
+}
+
+static void vboxNetLwfWinUpdateSavedOffloadConfig(PVBOXNETLWF_MODULE pModuleCtx, PNDIS_OFFLOAD pOffload)
+{
+    if (pModuleCtx->cbOffloadConfig < pOffload->Header.Size)
+    {
+        vboxNetLwfLogErrorEvent(IO_ERR_INTERNAL_ERROR, STATUS_SUCCESS, 10);
+        return;
+    }
+
+    NdisMoveMemory(pModuleCtx->pSavedOffloadConfig, pOffload, pOffload->Header.Size);
+    NdisMoveMemory(pModuleCtx->pDisabledOffloadConfig, pOffload, pOffload->Header.Size);
+    vboxNetLwfWinDisableOffloading(pModuleCtx->pDisabledOffloadConfig);
+    pModuleCtx->fOffloadConfigValid = true;
+}
+
+#ifdef VBOXNETLWF_FIXED_SIZE_POOLS
+static void vboxNetLwfWinFreePools(PVBOXNETLWF_MODULE pModuleCtx, int cPools)
+{
+    for (int i = 0; i < cPools; ++i)
+    {
+        if (pModuleCtx->hPool[i])
+        {
+            NdisFreeNetBufferListPool(pModuleCtx->hPool[i]);
+            Log4(("vboxNetLwfWinFreePools: freed NBL+NB pool 0x%p\n", pModuleCtx->hPool[i]));
+        }
+    }
+}
+#endif /* VBOXNETLWF_FIXED_SIZE_POOLS */
+
+
+static void vboxNetLwfWinFreeModuleResources(PVBOXNETLWF_MODULE pModuleCtx)
+{
+#ifdef VBOXNETLWF_FIXED_SIZE_POOLS
+    vboxNetLwfWinFreePools(pModuleCtx, RT_ELEMENTS(g_cbPool));
+#else /* !VBOXNETLWF_FIXED_SIZE_POOLS */
+    if (pModuleCtx->hPool)
+    {
+        NdisFreeNetBufferListPool(pModuleCtx->hPool);
+        Log4(("vboxNetLwfWinFreeModuleResources: freed NBL+NB pool 0x%p\n", pModuleCtx->hPool));
+    }
+#endif /* !VBOXNETLWF_FIXED_SIZE_POOLS */
+    if (pModuleCtx->pDisabledOffloadConfig)
+        NdisFreeMemory(pModuleCtx->pDisabledOffloadConfig, 0, 0);
+    if (pModuleCtx->pSavedOffloadConfig)
+        NdisFreeMemory(pModuleCtx->pSavedOffloadConfig, 0, 0);
+    if (pModuleCtx->hWorkItem)
+        NdisFreeIoWorkItem(pModuleCtx->hWorkItem);
+    NdisFreeMemory(pModuleCtx, 0, 0);
+}
+
+
+DECLARE_GLOBAL_CONST_UNICODE_STRING(g_strHostOnlyMiniportName, L"VirtualBox Host-Only");
+
+static NDIS_STATUS vboxNetLwfWinAttach(IN NDIS_HANDLE hFilter, IN NDIS_HANDLE hDriverCtx,
+                                       IN PNDIS_FILTER_ATTACH_PARAMETERS pParameters)
+{
+    LogFlow(("==>vboxNetLwfWinAttach: filter=%p\n", hFilter));
+
+    PVBOXNETLWFGLOBALS pGlobals = (PVBOXNETLWFGLOBALS)hDriverCtx;
+    if (!pGlobals)
+    {
+        vboxNetLwfLogErrorEvent(IO_ERR_INTERNAL_ERROR, NDIS_STATUS_FAILURE, 1);
+        return NDIS_STATUS_FAILURE;
+    }
+
+    /*
+     * We need a copy of NDIS_STRING structure as we are going to modify length
+     * of the base miniport instance name since RTL does not support comparing
+     * first n characters of two strings. We check if miniport names start with
+     * "Virtual Host-Only" to detect host-only adapters. It is a waste of resources
+     * to bind our filter to host-only adapters since they now operate independently.
+     */
+    NDIS_STRING strTruncatedInstanceName = *pParameters->BaseMiniportInstanceName; /* Do not copy data, only the structure itself */
+    strTruncatedInstanceName.Length = g_strHostOnlyMiniportName.Length; /* Truncate instance name */
+    if (RtlEqualUnicodeString(&strTruncatedInstanceName, &g_strHostOnlyMiniportName, TRUE /* Case insensitive */))
+    {
+        DbgPrint("vboxNetLwfWinAttach: won't attach to %wZ\n", pParameters->BaseMiniportInstanceName);
+        return NDIS_STATUS_FAILURE;
+    }
+
+    ANSI_STRING strMiniportName;
+    /* We use the miniport name to associate this filter module with the netflt instance */
+    NTSTATUS rc = RtlUnicodeStringToAnsiString(&strMiniportName,
+                                               pParameters->BaseMiniportName,
+                                               TRUE);
+    if (rc != STATUS_SUCCESS)
+    {
+        LogError(("vboxNetLwfWinAttach: RtlUnicodeStringToAnsiString(%ls) failed with 0x%x\n",
+             pParameters->BaseMiniportName, rc));
+        vboxNetLwfLogErrorEvent(IO_ERR_INTERNAL_ERROR, NDIS_STATUS_FAILURE, 2);
+        return NDIS_STATUS_FAILURE;
+    }
+    DbgPrint("vboxNetLwfWinAttach: friendly name=%wZ\n", pParameters->BaseMiniportInstanceName);
+    DbgPrint("vboxNetLwfWinAttach: name=%Z\n", &strMiniportName);
+
+    UINT cbModuleWithNameExtra = sizeof(VBOXNETLWF_MODULE) + strMiniportName.Length;
+    PVBOXNETLWF_MODULE pModuleCtx = (PVBOXNETLWF_MODULE)NdisAllocateMemoryWithTagPriority(hFilter,
+                                                                      cbModuleWithNameExtra,
+                                                                      VBOXNETLWF_MEM_TAG,
+                                                                      LowPoolPriority);
+    if (!pModuleCtx)
+    {
+        LogError(("vboxNetLwfWinAttach: Failed to allocate module context for %ls\n", pParameters->BaseMiniportName));
+        RtlFreeAnsiString(&strMiniportName);
+        vboxNetLwfLogErrorEvent(IO_ERR_INSUFFICIENT_RESOURCES, NDIS_STATUS_RESOURCES, 3);
+        return NDIS_STATUS_RESOURCES;
+    }
+    Log4(("vboxNetLwfWinAttach: allocated module context 0x%p\n", pModuleCtx));
+
+    NdisZeroMemory(pModuleCtx, cbModuleWithNameExtra);
+    NdisMoveMemory(pModuleCtx->szMiniportName, strMiniportName.Buffer, strMiniportName.Length);
+    RtlFreeAnsiString(&strMiniportName);
+
+    pModuleCtx->hWorkItem = NdisAllocateIoWorkItem(g_VBoxNetLwfGlobals.hFilterDriver);
+    if (!pModuleCtx->hWorkItem)
+    {
+        LogError(("vboxNetLwfWinAttach: Failed to allocate work item for %ls\n",
+                pParameters->BaseMiniportName));
+        NdisFreeMemory(pModuleCtx, 0, 0);
+        vboxNetLwfLogErrorEvent(IO_ERR_INSUFFICIENT_RESOURCES, NDIS_STATUS_RESOURCES, 4);
+        return NDIS_STATUS_RESOURCES;
+    }
+
+    Assert(pParameters->MacAddressLength == sizeof(RTMAC));
+    NdisMoveMemory(&pModuleCtx->MacAddr, pParameters->CurrentMacAddress, RT_MIN(sizeof(RTMAC), pParameters->MacAddressLength));
+
+    pModuleCtx->cbOffloadConfig = sizeof(NDIS_OFFLOAD) * 2; /* Best guess to accomodate future expansion. */
+    /* Get the exact size, if possible. */
+    if (pParameters->DefaultOffloadConfiguration)
+        pModuleCtx->cbOffloadConfig = pParameters->DefaultOffloadConfiguration->Header.Size;
+    else
+        vboxNetLwfLogErrorEvent(IO_ERR_INTERNAL_ERROR, STATUS_SUCCESS, 8);
+
+    pModuleCtx->pSavedOffloadConfig =
+        (PNDIS_OFFLOAD)NdisAllocateMemoryWithTagPriority(hFilter, pModuleCtx->cbOffloadConfig,
+                                                         VBOXNETLWF_MEM_TAG, LowPoolPriority);
+    pModuleCtx->pDisabledOffloadConfig =
+        (PNDIS_OFFLOAD)NdisAllocateMemoryWithTagPriority(hFilter, pModuleCtx->cbOffloadConfig,
+                                                         VBOXNETLWF_MEM_TAG, LowPoolPriority);
+    if (!pModuleCtx->pSavedOffloadConfig || !pModuleCtx->pDisabledOffloadConfig)
+    {
+        LogError(("vboxNetLwfWinAttach: Failed to allocate offload config buffers for %ls\n",
+                pParameters->BaseMiniportName));
+        vboxNetLwfWinFreeModuleResources(pModuleCtx);
+        vboxNetLwfLogErrorEvent(IO_ERR_INSUFFICIENT_RESOURCES, NDIS_STATUS_RESOURCES, 9);
+        return NDIS_STATUS_RESOURCES;
+    }
+
+    if (pParameters->DefaultOffloadConfiguration)
+        vboxNetLwfWinUpdateSavedOffloadConfig(pModuleCtx, pParameters->DefaultOffloadConfiguration);
+    else
+    {
+        NdisZeroMemory(pModuleCtx->pDisabledOffloadConfig, pModuleCtx->cbOffloadConfig);
+        pModuleCtx->pDisabledOffloadConfig->Header.Type = NDIS_OBJECT_TYPE_OFFLOAD;
+        pModuleCtx->pDisabledOffloadConfig->Header.Revision = NDIS_OFFLOAD_REVISION_1;
+        pModuleCtx->pDisabledOffloadConfig->Header.Size = NDIS_SIZEOF_NDIS_OFFLOAD_REVISION_1;
+    }
+
+    pModuleCtx->pGlobals  = pGlobals;
+    pModuleCtx->hFilter   = hFilter;
+    vboxNetLwfWinChangeState(pModuleCtx, LwfState_Attaching);
+    /* Initialize transmission mutex and events */
+    NDIS_INIT_MUTEX(&pModuleCtx->InTransmit);
+#ifdef VBOXNETLWF_SYNC_SEND
+    KeInitializeEvent(&pModuleCtx->EventWire, SynchronizationEvent, FALSE);
+    KeInitializeEvent(&pModuleCtx->EventHost, SynchronizationEvent, FALSE);
+#else /* !VBOXNETLWF_SYNC_SEND */
+    NdisInitializeEvent(&pModuleCtx->EventSendComplete);
+    pModuleCtx->cPendingBuffers = 0;
+#endif /* !VBOXNETLWF_SYNC_SEND */
+
+#ifdef VBOXNETLWF_FIXED_SIZE_POOLS
+    for (int i = 0; i < RT_ELEMENTS(g_cbPool); ++i)
+    {
+        /* Allocate buffer pools */
+        NET_BUFFER_LIST_POOL_PARAMETERS PoolParams;
+        NdisZeroMemory(&PoolParams, sizeof(PoolParams));
+        PoolParams.Header.Type = NDIS_OBJECT_TYPE_DEFAULT;
+        PoolParams.Header.Revision = NET_BUFFER_LIST_POOL_PARAMETERS_REVISION_1;
+        PoolParams.Header.Size = sizeof(PoolParams);
+        PoolParams.ProtocolId = NDIS_PROTOCOL_ID_DEFAULT;
+        PoolParams.fAllocateNetBuffer = TRUE;
+        PoolParams.ContextSize = 0; /** @todo Do we need to consider underlying drivers? I think not. */
+        PoolParams.PoolTag = VBOXNETLWF_MEM_TAG;
+        PoolParams.DataSize = g_cbPool[i];
+        pModuleCtx->hPool[i] = NdisAllocateNetBufferListPool(hFilter, &PoolParams);
+        if (!pModuleCtx->hPool[i])
+        {
+            LogError(("vboxNetLwfWinAttach: NdisAllocateNetBufferListPool failed\n"));
+            vboxNetLwfWinFreeModuleResources(pModuleCtx);
+            vboxNetLwfLogErrorEvent(IO_ERR_INSUFFICIENT_RESOURCES, NDIS_STATUS_RESOURCES, 7);
+            return NDIS_STATUS_RESOURCES;
+        }
+        Log4(("vboxNetLwfWinAttach: allocated NBL+NB pool (data size=%u) 0x%p\n",
+              PoolParams.DataSize, pModuleCtx->hPool[i]));
+    }
+#else /* !VBOXNETLWF_FIXED_SIZE_POOLS */
+    /* Allocate buffer pools */
+    NET_BUFFER_LIST_POOL_PARAMETERS PoolParams;
+    NdisZeroMemory(&PoolParams, sizeof(PoolParams));
+    PoolParams.Header.Type = NDIS_OBJECT_TYPE_DEFAULT;
+    PoolParams.Header.Revision = NET_BUFFER_LIST_POOL_PARAMETERS_REVISION_1;
+    PoolParams.Header.Size = sizeof(PoolParams);
+    PoolParams.ProtocolId = NDIS_PROTOCOL_ID_DEFAULT;
+    PoolParams.fAllocateNetBuffer = TRUE;
+    PoolParams.ContextSize = 0; /** @todo Do we need to consider underlying drivers? I think not. */
+    PoolParams.PoolTag = VBOXNETLWF_MEM_TAG;
+    pModuleCtx->hPool = NdisAllocateNetBufferListPool(hFilter, &PoolParams);
+    if (!pModuleCtx->hPool)
+    {
+        LogError(("vboxNetLwfWinAttach: NdisAllocateNetBufferListPool failed\n"));
+        vboxNetLwfWinFreeModuleResources(pModuleCtx);
+        vboxNetLwfLogErrorEvent(IO_ERR_INSUFFICIENT_RESOURCES, NDIS_STATUS_RESOURCES, 7);
+        return NDIS_STATUS_RESOURCES;
+    }
+    Log4(("vboxNetLwfWinAttach: allocated NBL+NB pool 0x%p\n", pModuleCtx->hPool));
+#endif /* !VBOXNETLWF_FIXED_SIZE_POOLS */
+
+    NDIS_FILTER_ATTRIBUTES Attributes;
+    NdisZeroMemory(&Attributes, sizeof(Attributes));
+    Attributes.Header.Revision = NDIS_FILTER_ATTRIBUTES_REVISION_1;
+    Attributes.Header.Size = sizeof(Attributes);
+    Attributes.Header.Type = NDIS_OBJECT_TYPE_FILTER_ATTRIBUTES;
+    Attributes.Flags = 0;
+    NDIS_STATUS Status = NdisFSetAttributes(hFilter, pModuleCtx, &Attributes);
+    if (Status != NDIS_STATUS_SUCCESS)
+    {
+        LogError(("vboxNetLwfWinAttach: NdisFSetAttributes failed with 0x%x\n", Status));
+        vboxNetLwfWinFreeModuleResources(pModuleCtx);
+        vboxNetLwfLogErrorEvent(IO_ERR_INTERNAL_ERROR, NDIS_STATUS_RESOURCES, 5);
+        return NDIS_STATUS_RESOURCES;
+    }
+    /* Insert into module chain */
+    NdisAcquireSpinLock(&pGlobals->Lock);
+    RTListPrepend(&pGlobals->listModules, &pModuleCtx->node);
+    NdisReleaseSpinLock(&pGlobals->Lock);
+
+    vboxNetLwfWinChangeState(pModuleCtx, LwfState_Paused);
+
+    /// @todo Somehow the packet filter is 0 at this point: Status = vboxNetLwfWinGetPacketFilter(pModuleCtx);
+    /// @todo We actually update it later in status handler, perhaps we should not do anything here.
+
+    LogFlow(("<==vboxNetLwfWinAttach: Status = 0x%x\n", Status));
+    return Status;
+}
+
+static VOID vboxNetLwfWinDetach(IN NDIS_HANDLE hModuleCtx)
+{
+    LogFlow(("==>vboxNetLwfWinDetach: module=%p\n", hModuleCtx));
+    PVBOXNETLWF_MODULE pModuleCtx = (PVBOXNETLWF_MODULE)hModuleCtx;
+    vboxNetLwfWinChangeState(pModuleCtx, LwfState_Detached, LwfState_Paused);
+
+    /* Remove from module chain */
+    NdisAcquireSpinLock(&pModuleCtx->pGlobals->Lock);
+    RTListNodeRemove(&pModuleCtx->node);
+    NdisReleaseSpinLock(&pModuleCtx->pGlobals->Lock);
+
+    PVBOXNETFLTINS pNetFltIns = pModuleCtx->pNetFlt; /// @todo Atomic?
+    if (pNetFltIns && vboxNetFltTryRetainBusyNotDisconnected(pNetFltIns))
+    {
+        /*
+         * Set hModuleCtx to null now in order to prevent filter restart,
+         * OID requests and other stuff associated with NetFlt deactivation.
+         */
+        pNetFltIns->u.s.WinIf.hModuleCtx = NULL;
+        /* Notify NetFlt that we are going down */
+        pNetFltIns->pSwitchPort->pfnDisconnect(pNetFltIns->pSwitchPort, &pNetFltIns->MyPort, vboxNetFltPortReleaseBusy);
+        /* We do not 'release' netflt instance since it has been done by pfnDisconnect */
+    }
+    pModuleCtx->pNetFlt = NULL;
+
+    /*
+     * We have to make sure that all NET_BUFFER_LIST structures have been freed by now, but
+     * it does not require us to do anything here since it has already been taken care of
+     * by vboxNetLwfWinPause().
+     */
+    vboxNetLwfWinFreeModuleResources(pModuleCtx);
+    Log4(("vboxNetLwfWinDetach: freed module context 0x%p\n", pModuleCtx));
+    LogFlow(("<==vboxNetLwfWinDetach\n"));
+}
+
+
+static NDIS_STATUS vboxNetLwfWinPause(IN NDIS_HANDLE hModuleCtx, IN PNDIS_FILTER_PAUSE_PARAMETERS pParameters)
+{
+    RT_NOREF1(pParameters);
+    LogFlow(("==>vboxNetLwfWinPause: module=%p\n", hModuleCtx));
+    PVBOXNETLWF_MODULE pModuleCtx = (PVBOXNETLWF_MODULE)hModuleCtx;
+    vboxNetLwfWinChangeState(pModuleCtx, LwfState_Pausing, LwfState_Running);
+    /* Wait for pending send/indication operations to complete. */
+    NDIS_WAIT_FOR_MUTEX(&pModuleCtx->InTransmit);
+#ifndef VBOXNETLWF_SYNC_SEND
+    NdisWaitEvent(&pModuleCtx->EventSendComplete, 1000 /* ms */);
+#endif /* !VBOXNETLWF_SYNC_SEND */
+    vboxNetLwfWinChangeState(pModuleCtx, LwfState_Paused, LwfState_Pausing);
+    NDIS_RELEASE_MUTEX(&pModuleCtx->InTransmit);
+    LogFlow(("<==vboxNetLwfWinPause\n"));
+    return NDIS_STATUS_SUCCESS; /* Failure is not an option */
+}
+
+
+static void vboxNetLwfWinIndicateOffload(PVBOXNETLWF_MODULE pModuleCtx, PNDIS_OFFLOAD pOffload)
+{
+    Log5(("vboxNetLwfWinIndicateOffload: offload config changed to:\n"));
+    vboxNetLwfWinDumpOffloadSettings(pOffload);
+    NDIS_STATUS_INDICATION OffloadingIndication;
+    NdisZeroMemory(&OffloadingIndication, sizeof(OffloadingIndication));
+    OffloadingIndication.Header.Type = NDIS_OBJECT_TYPE_STATUS_INDICATION;
+    OffloadingIndication.Header.Revision = NDIS_STATUS_INDICATION_REVISION_1;
+    OffloadingIndication.Header.Size = NDIS_SIZEOF_STATUS_INDICATION_REVISION_1;
+    OffloadingIndication.SourceHandle = pModuleCtx->hFilter;
+    OffloadingIndication.StatusCode = NDIS_STATUS_TASK_OFFLOAD_CURRENT_CONFIG;
+    OffloadingIndication.StatusBuffer = pOffload;
+    OffloadingIndication.StatusBufferSize = pOffload->Header.Size;
+    NdisFIndicateStatus(pModuleCtx->hFilter, &OffloadingIndication);
+}
+
+
+static NDIS_STATUS vboxNetLwfWinRestart(IN NDIS_HANDLE hModuleCtx, IN PNDIS_FILTER_RESTART_PARAMETERS pParameters)
+{
+    RT_NOREF1(pParameters);
+    LogFlow(("==>vboxNetLwfWinRestart: module=%p\n", hModuleCtx));
+    PVBOXNETLWF_MODULE pModuleCtx = (PVBOXNETLWF_MODULE)hModuleCtx;
+    vboxNetLwfWinChangeState(pModuleCtx, LwfState_Restarting, LwfState_Paused);
+
+    /* By default the packets that go between VMs and wire are invisible to the host. */
+    pModuleCtx->fPassVmTrafficToHost = false;
+
+    NDIS_HANDLE hConfig;
+    NDIS_CONFIGURATION_OBJECT cfgObj;
+    cfgObj.Header.Type = NDIS_OBJECT_TYPE_CONFIGURATION_OBJECT;
+    cfgObj.Header.Revision = NDIS_CONFIGURATION_OBJECT_REVISION_1;
+    cfgObj.Header.Size = sizeof(NDIS_CONFIGURATION_OBJECT);
+    cfgObj.NdisHandle = g_VBoxNetLwfGlobals.hFilterDriver;
+
+    NDIS_STATUS Status = NdisOpenConfigurationEx(&cfgObj, &hConfig);
+    if (Status == NDIS_STATUS_SUCCESS)
+    {
+        NDIS_STRING strCfgParam = NDIS_STRING_CONST("PassVmTrafficToHost");
+        PNDIS_CONFIGURATION_PARAMETER pParam = NULL;
+        NdisReadConfiguration(&Status, &pParam, hConfig, &strCfgParam, NdisParameterInteger);
+        if (Status != NDIS_STATUS_SUCCESS)
+        {
+            Log(("vboxNetLwfWinRestart: Failed to read 'PassVmTrafficToHost' from the registry.\n"));
+        }
+        else if (pParam->ParameterData.IntegerData != 0)
+        {
+            Log(("vboxNetLwfWinRestart: Allowing the host to see VM traffic in promisc mode by user request.\n"));
+            pModuleCtx->fPassVmTrafficToHost = true;
+        }
+        NdisCloseConfiguration(hConfig);
+    }
+    vboxNetLwfWinChangeState(pModuleCtx, LwfState_Running, LwfState_Restarting);
+    LogFlow(("<==vboxNetLwfWinRestart: Status = 0x%x, returning NDIS_STATUS_SUCCESS nontheless.\n", Status));
+    return NDIS_STATUS_SUCCESS;
+}
+
+
+static void vboxNetLwfWinDestroySG(PINTNETSG pSG)
+{
+    NdisFreeMemory(pSG, 0, 0);
+    Log4(("vboxNetLwfWinDestroySG: freed SG 0x%p\n", pSG));
+}
+
+/**
+ * Worker for vboxNetLwfWinNBtoSG() that gets the max segment count needed.
+ * @note vboxNetLwfWinNBtoSG may use fewer depending on cbPacket and offset!
+ * @note vboxNetAdpWinCalcSegments() is a copy of this code.
+ */
+DECLINLINE(ULONG) vboxNetLwfWinCalcSegments(PNET_BUFFER pNetBuf)
+{
+    ULONG cSegs = 0;
+    for (PMDL pMdl = NET_BUFFER_CURRENT_MDL(pNetBuf); pMdl; pMdl = NDIS_MDL_LINKAGE(pMdl))
+    {
+        /* Skip empty MDLs (see @bugref{9233}) */
+        if (MmGetMdlByteCount(pMdl))
+            cSegs++;
+    }
+    return cSegs;
+}
+
+DECLINLINE(void) vboxNetLwfWinFreeMdlChain(PMDL pMdl)
+{
+#ifndef VBOXNETLWF_FIXED_SIZE_POOLS
+    PMDL pMdlNext;
+    while (pMdl)
+    {
+        pMdlNext = pMdl->Next;
+# ifndef VBOXNETLWF_SYNC_SEND
+        PUCHAR pDataBuf;
+        ULONG cb = 0;
+        NdisQueryMdl(pMdl, &pDataBuf, &cb, NormalPagePriority);
+# endif /* !VBOXNETLWF_SYNC_SEND */
+        NdisFreeMdl(pMdl);
+        Log4(("vboxNetLwfWinFreeMdlChain: freed MDL 0x%p\n", pMdl));
+# ifndef VBOXNETLWF_SYNC_SEND
+        NdisFreeMemory(pDataBuf, 0, 0);
+        Log4(("vboxNetLwfWinFreeMdlChain: freed data buffer 0x%p\n", pDataBuf));
+# endif /* !VBOXNETLWF_SYNC_SEND */
+        pMdl = pMdlNext;
+    }
+#else  /* VBOXNETLWF_FIXED_SIZE_POOLS */
+    RT_NOREF1(pMdl);
+#endif /* VBOXNETLWF_FIXED_SIZE_POOLS */
+}
+
+/** @todo
+ * 1) Copy data from SG to MDL (if we decide to complete asynchronously).
+ * 2) Provide context/backfill space. Nobody does it, should we?
+ * 3) We always get a single segment from intnet. Simplify?
+ */
+static PNET_BUFFER_LIST vboxNetLwfWinSGtoNB(PVBOXNETLWF_MODULE pModule, PINTNETSG pSG)
+{
+    AssertReturn(pSG->cSegsUsed >= 1, NULL);
+    LogFlow(("==>vboxNetLwfWinSGtoNB: segments=%d hPool=%p cb=%u\n", pSG->cSegsUsed,
+             pModule->hPool, pSG->cbTotal));
+    AssertReturn(pModule->hPool, NULL);
+
+#ifdef VBOXNETLWF_SYNC_SEND
+    PINTNETSEG pSeg = pSG->aSegs;
+    PMDL pMdl = NdisAllocateMdl(pModule->hFilter, pSeg->pv, pSeg->cb);
+    if (!pMdl)
+    {
+        LogError(("vboxNetLwfWinSGtoNB: failed to allocate an MDL\n"));
+        LogFlow(("<==vboxNetLwfWinSGtoNB: return NULL\n"));
+        return NULL;
+    }
+    Log4(("vboxNetLwfWinSGtoNB: allocated Mdl 0x%p\n", pMdl));
+    PMDL pMdlCurr = pMdl;
+    for (int i = 1; i < pSG->cSegsUsed; i++)
+    {
+        pSeg = &pSG->aSegs[i];
+        pMdlCurr->Next = NdisAllocateMdl(pModule->hFilter, pSeg->pv, pSeg->cb);
+        if (!pMdlCurr->Next)
+        {
+            LogError(("vboxNetLwfWinSGtoNB: failed to allocate an MDL\n"));
+            /* Tear down all MDL we chained so far */
+            vboxNetLwfWinFreeMdlChain(pMdl);
+            return NULL;
+        }
+        pMdlCurr = pMdlCurr->Next;
+        Log4(("vboxNetLwfWinSGtoNB: allocated Mdl 0x%p\n", pMdlCurr));
+    }
+    PNET_BUFFER_LIST pBufList = NdisAllocateNetBufferAndNetBufferList(pModule->hPool,
+                                                                      0 /* ContextSize */,
+                                                                      0 /* ContextBackFill */,
+                                                                      pMdl,
+                                                                      0 /* DataOffset */,
+                                                                      pSG->cbTotal);
+    if (pBufList)
+    {
+        Log4(("vboxNetLwfWinSGtoNB: allocated NBL+NB 0x%p\n", pBufList));
+        pBufList->SourceHandle = pModule->hFilter;
+        /** @todo Do we need to initialize anything else? */
+    }
+    else
+    {
+        LogError(("vboxNetLwfWinSGtoNB: failed to allocate an NBL+NB\n"));
+        vboxNetLwfWinFreeMdlChain(pMdl);
+    }
+#else /* !VBOXNETLWF_SYNC_SEND */
+
+# ifdef VBOXNETLWF_FIXED_SIZE_POOLS
+    int iPool = 0;
+    ULONG cbFrame = VBOXNETLWF_MAX_FRAME_SIZE(pSG->cbTotal);
+    /* Let's find the appropriate pool first */
+    for (iPool = 0; iPool < RT_ELEMENTS(g_cbPool); ++iPool)
+        if (cbFrame <= g_cbPool[iPool])
+            break;
+    if (iPool >= RT_ELEMENTS(g_cbPool))
+    {
+        LogError(("vboxNetLwfWinSGtoNB: frame is too big (%u > %u), drop it.\n", cbFrame, g_cbPool[RT_ELEMENTS(g_cbPool)-1]));
+        LogFlow(("<==vboxNetLwfWinSGtoNB: return NULL\n"));
+        return NULL;
+    }
+    PNET_BUFFER_LIST pBufList = NdisAllocateNetBufferList(pModule->hPool[iPool],
+                                                          0 /** @todo ContextSize */,
+                                                          0 /** @todo ContextBackFill */);
+    if (!pBufList)
+    {
+        LogError(("vboxNetLwfWinSGtoNB: failed to allocate netbuffer (cb=%u) from pool %d\n", cbFrame, iPool));
+        LogFlow(("<==vboxNetLwfWinSGtoNB: return NULL\n"));
+        return NULL;
+    }
+    const ULONG cbAlignmentMask = sizeof(USHORT) - 1; /* Microsoft LB/FO provider expects packets to be aligned at word boundary. */
+    ULONG cbAlignedFrame = (pSG->cbTotal + cbAlignmentMask) & ~cbAlignmentMask;
+    Assert(cbAlignedFrame >= pSG->cbTotal);
+    Assert(cbFrame >= cbAlignedFrame);
+    NET_BUFFER *pBuffer = NET_BUFFER_LIST_FIRST_NB(pBufList);
+    NDIS_STATUS Status = NdisRetreatNetBufferDataStart(pBuffer, cbAlignedFrame, 0 /** @todo DataBackfill */, NULL);
+    if (cbAlignedFrame - pSG->cbTotal > 0)
+    {
+        /* Make sure padding zeros do not get to the wire. */
+        if (NET_BUFFER_DATA_LENGTH(pBuffer) != cbAlignedFrame)
+            vboxNetLwfLogErrorEvent(IO_ERR_INTERNAL_ERROR, STATUS_SUCCESS, 11);
+        else
+            NET_BUFFER_DATA_LENGTH(pBuffer) = pSG->cbTotal;
+    }
+    if (Status == NDIS_STATUS_SUCCESS)
+    {
+        uint8_t *pDst = (uint8_t*)NdisGetDataBuffer(pBuffer, pSG->cbTotal, NULL, 1, 0);
+        if (pDst)
+        {
+            for (int i = 0; i < pSG->cSegsUsed; i++)
+            {
+                NdisMoveMemory(pDst, pSG->aSegs[i].pv, pSG->aSegs[i].cb);
+                pDst += pSG->aSegs[i].cb;
+            }
+            Log4(("vboxNetLwfWinSGtoNB: allocated NBL+NB 0x%p\n", pBufList));
+            pBufList->SourceHandle = pModule->hFilter;
+        }
+        else
+        {
+            LogError(("vboxNetLwfWinSGtoNB: failed to obtain the buffer pointer (size=%u)\n", pSG->cbTotal));
+            NdisAdvanceNetBufferDataStart(pBuffer, cbAlignedFrame, false, NULL); /** @todo why bother? */
+            NdisFreeNetBufferList(pBufList);
+            pBufList = NULL;
+        }
+    }
+    else
+    {
+        LogError(("vboxNetLwfWinSGtoNB: NdisRetreatNetBufferDataStart failed with 0x%x (size=%u)\n", Status, pSG->cbTotal));
+        NdisFreeNetBufferList(pBufList);
+        pBufList = NULL;
+    }
+# else /* !VBOXNETLWF_FIXED_SIZE_POOLS */
+    PNET_BUFFER_LIST pBufList = NULL;
+    ULONG cbMdl = VBOXNETLWF_MAX_FRAME_SIZE(pSG->cbTotal);
+    ULONG uDataOffset = cbMdl - pSG->cbTotal;
+    PUCHAR pDataBuf = (PUCHAR)NdisAllocateMemoryWithTagPriority(pModule->hFilter, cbMdl,
+                                                                VBOXNETLWF_MEM_TAG, NormalPoolPriority);
+    if (pDataBuf)
+    {
+        Log4(("vboxNetLwfWinSGtoNB: allocated data buffer (cb=%u) 0x%p\n", cbMdl, pDataBuf));
+        PMDL pMdl = NdisAllocateMdl(pModule->hFilter, pDataBuf, cbMdl);
+        if (!pMdl)
+        {
+            NdisFreeMemory(pDataBuf, 0, 0);
+            Log4(("vboxNetLwfWinSGtoNB: freed data buffer 0x%p\n", pDataBuf));
+            LogError(("vboxNetLwfWinSGtoNB: failed to allocate an MDL (cb=%u)\n", cbMdl));
+            LogFlow(("<==vboxNetLwfWinSGtoNB: return NULL\n"));
+            return NULL;
+        }
+        PUCHAR pDst = pDataBuf + uDataOffset;
+        for (int i = 0; i < pSG->cSegsUsed; i++)
+        {
+            NdisMoveMemory(pDst, pSG->aSegs[i].pv, pSG->aSegs[i].cb);
+            pDst += pSG->aSegs[i].cb;
+        }
+        pBufList = NdisAllocateNetBufferAndNetBufferList(pModule->hPool,
+                                                         0 /* ContextSize */,
+                                                         0 /* ContextBackFill */,
+                                                         pMdl,
+                                                         uDataOffset,
+                                                         pSG->cbTotal);
+        if (pBufList)
+        {
+            Log4(("vboxNetLwfWinSGtoNB: allocated NBL+NB 0x%p\n", pBufList));
+            pBufList->SourceHandle = pModule->hFilter;
+            /** @todo Do we need to initialize anything else? */
+        }
+        else
+        {
+            LogError(("vboxNetLwfWinSGtoNB: failed to allocate an NBL+NB\n"));
+            vboxNetLwfWinFreeMdlChain(pMdl);
+        }
+    }
+    else
+    {
+        LogError(("vboxNetLwfWinSGtoNB: failed to allocate data buffer (size=%u)\n", cbMdl));
+    }
+# endif /* !VBOXNETLWF_FIXED_SIZE_POOLS */
+
+#endif /* !VBOXNETLWF_SYNC_SEND */
+    LogFlow(("<==vboxNetLwfWinSGtoNB: return %p\n", pBufList));
+    return pBufList;
+}
+
+/**
+ * @note vboxNetAdpWinNBtoSG() is a copy of this code.
+ */
+static PINTNETSG vboxNetLwfWinNBtoSG(PVBOXNETLWF_MODULE pModule, PNET_BUFFER pNetBuf)
+{
+    ULONG cbPacket = NET_BUFFER_DATA_LENGTH(pNetBuf);
+    ULONG cSegs = vboxNetLwfWinCalcSegments(pNetBuf);
+    /* Allocate and initialize SG */
+    PINTNETSG pSG = (PINTNETSG)NdisAllocateMemoryWithTagPriority(pModule->hFilter,
+                                                                 RT_UOFFSETOF_DYN(INTNETSG, aSegs[cSegs]),
+                                                                 VBOXNETLWF_MEM_TAG,
+                                                                 NormalPoolPriority);
+    AssertReturn(pSG, pSG);
+    Log4(("vboxNetLwfWinNBtoSG: allocated SG 0x%p\n", pSG));
+    IntNetSgInitTempSegs(pSG, cbPacket /*cbTotal*/, cSegs, cSegs /*cSegsUsed*/);
+
+    ULONG uOffset = NET_BUFFER_CURRENT_MDL_OFFSET(pNetBuf);
+    cSegs = 0;
+    for (PMDL pMdl = NET_BUFFER_CURRENT_MDL(pNetBuf);
+         pMdl != NULL && cbPacket > 0;
+         pMdl = NDIS_MDL_LINKAGE(pMdl))
+    {
+        ULONG cbSrc = MmGetMdlByteCount(pMdl);
+        if (cbSrc == 0)
+            continue; /* Skip empty MDLs (see @bugref{9233}) */
+
+        PUCHAR pSrc = (PUCHAR)MmGetSystemAddressForMdlSafe(pMdl, LowPagePriority);
+        if (!pSrc)
+        {
+            vboxNetLwfWinDestroySG(pSG);
+            return NULL;
+        }
+
+        /* Handle the offset in the current (which is the first for us) MDL */
+        if (uOffset)
+        {
+            if (uOffset < cbSrc)
+            {
+                pSrc  += uOffset;
+                cbSrc -= uOffset;
+                uOffset = 0;
+            }
+            else
+            {
+                /* This is an invalid MDL chain */
+                vboxNetLwfWinDestroySG(pSG);
+                return NULL;
+            }
+        }
+
+        /* Do not read the last MDL beyond packet's end */
+        if (cbSrc > cbPacket)
+            cbSrc = cbPacket;
+
+        Assert(cSegs < pSG->cSegsAlloc);
+        pSG->aSegs[cSegs].pv = pSrc;
+        pSG->aSegs[cSegs].cb = cbSrc;
+        pSG->aSegs[cSegs].Phys = NIL_RTHCPHYS;
+        cSegs++;
+        cbPacket -= cbSrc;
+    }
+
+    Assert(cbPacket == 0);
+    Assert(cSegs <= pSG->cSegsUsed);
+
+    /* Update actual segment count in case we used fewer than anticipated. */
+    pSG->cSegsUsed = (uint16_t)cSegs;
+
+    return pSG;
+}
+
+VOID vboxNetLwfWinStatus(IN NDIS_HANDLE hModuleCtx, IN PNDIS_STATUS_INDICATION pIndication)
+{
+    LogFlow(("==>vboxNetLwfWinStatus: module=%p\n", hModuleCtx));
+    PVBOXNETLWF_MODULE pModuleCtx = (PVBOXNETLWF_MODULE)hModuleCtx;
+    Log(("vboxNetLwfWinStatus: Got status indication: %s\n", vboxNetLwfWinStatusToText(pIndication->StatusCode)));
+    switch (pIndication->StatusCode)
+    {
+        case NDIS_STATUS_PACKET_FILTER:
+            vboxNetLwfWinDumpFilterTypes(*(ULONG*)pIndication->StatusBuffer);
+            vboxNetLwfWinOverridePacketFiltersUp(pModuleCtx, (ULONG*)pIndication->StatusBuffer);
+            Log(("vboxNetLwfWinStatus: Reporting status: %s\n", vboxNetLwfWinStatusToText(pIndication->StatusCode)));
+            vboxNetLwfWinDumpFilterTypes(*(ULONG*)pIndication->StatusBuffer);
+            break;
+        case NDIS_STATUS_TASK_OFFLOAD_CURRENT_CONFIG:
+            Log5(("vboxNetLwfWinStatus: offloading currently set to:\n"));
+            vboxNetLwfWinDumpOffloadSettings((PNDIS_OFFLOAD)pIndication->StatusBuffer);
+            vboxNetLwfWinUpdateSavedOffloadConfig(pModuleCtx, (PNDIS_OFFLOAD)pIndication->StatusBuffer);
+            if (ASMAtomicReadBool(&pModuleCtx->fActive))
+                vboxNetLwfWinDisableOffloading((PNDIS_OFFLOAD)pIndication->StatusBuffer);
+            Log5(("vboxNetLwfWinStatus: reporting offloading up as:\n"));
+            vboxNetLwfWinDumpOffloadSettings((PNDIS_OFFLOAD)pIndication->StatusBuffer);
+            break;
+    }
+    NdisFIndicateStatus(pModuleCtx->hFilter, pIndication);
+    LogFlow(("<==vboxNetLwfWinStatus\n"));
+}
+
+static bool vboxNetLwfWinForwardToIntNet(PVBOXNETLWF_MODULE pModuleCtx, PNET_BUFFER_LIST pBufLists, uint32_t fSrc)
+{
+    /* We must not forward anything to the trunk unless it is ready to receive. */
+    if (!ASMAtomicReadBool(&pModuleCtx->fActive))
+    {
+        Log(("vboxNetLwfWinForwardToIntNet: trunk is inactive, won't forward\n"));
+        return false;
+    }
+    /* Some NPF protocols make NDIS to loop back packets at miniport level, we must ignore those. */
+    if (NdisTestNblFlag(pBufLists, NDIS_NBL_FLAGS_IS_LOOPBACK_PACKET))
+    {
+        if (pBufLists->SourceHandle == pModuleCtx->hFilter && !pModuleCtx->fPassVmTrafficToHost)
+        {
+            /* Drop the packets we've injected. */
+            vboxNetLwfWinDumpPackets("vboxNetLwfWinForwardToIntNet: dropping loopback", pBufLists);
+            return true;
+        }
+        vboxNetLwfWinDumpPackets("vboxNetLwfWinForwardToIntNet: passing through loopback", pBufLists);
+        return false;
+    }
+
+    AssertReturn(pModuleCtx->pNetFlt, false);
+    AssertReturn(pModuleCtx->pNetFlt->pSwitchPort, false);
+    AssertReturn(pModuleCtx->pNetFlt->pSwitchPort->pfnRecv, false);
+    LogFlow(("==>vboxNetLwfWinForwardToIntNet: module=%p\n", pModuleCtx));
+    Assert(pBufLists);                                                   /* The chain must contain at least one list */
+    Assert(NET_BUFFER_LIST_NEXT_NBL(pBufLists) == NULL); /* The caller is supposed to unlink the list from the chain */
+    /*
+     * Even if NBL contains more than one buffer we are prepared to deal with it.
+     * When any of buffers should not be dropped we keep the whole list. It is
+     * better to leak some "unexpected" packets to the wire/host than to loose any.
+     */
+    bool fDropIt   = false;
+    bool fDontDrop = false;
+    int nLists = 0;
+    for (PNET_BUFFER_LIST pList = pBufLists; pList; pList = NET_BUFFER_LIST_NEXT_NBL(pList))
+    {
+        int nBuffers = 0;
+        nLists++;
+        for (PNET_BUFFER pBuf = NET_BUFFER_LIST_FIRST_NB(pList); pBuf; pBuf = NET_BUFFER_NEXT_NB(pBuf))
+        {
+            nBuffers++;
+            PINTNETSG pSG = vboxNetLwfWinNBtoSG(pModuleCtx, pBuf);
+            if (pSG)
+            {
+                vboxNetLwfWinDumpPacket(pSG, (fSrc & INTNETTRUNKDIR_WIRE)?"intnet <-- wire":"intnet <-- host");
+                /* A bit paranoid, but we do not use any locks, so... */
+                if (ASMAtomicReadBool(&pModuleCtx->fActive))
+                    if (pModuleCtx->pNetFlt->pSwitchPort->pfnRecv(pModuleCtx->pNetFlt->pSwitchPort, NULL, pSG, fSrc))
+                        fDropIt = true;
+                    else
+                        fDontDrop = true;
+                vboxNetLwfWinDestroySG(pSG);
+            }
+        }
+        Log(("vboxNetLwfWinForwardToIntNet: list=%d buffers=%d\n", nLists, nBuffers));
+    }
+    Log(("vboxNetLwfWinForwardToIntNet: lists=%d drop=%s don't=%s\n", nLists, fDropIt ? "true":"false", fDontDrop ? "true":"false"));
+
+    /* If the host (and the user) wants to see all packets we must not drop any. */
+    if (pModuleCtx->fPassVmTrafficToHost && vboxNetLwfWinIsPromiscuous(pModuleCtx))
+        fDropIt = false;
+
+    LogFlow(("<==vboxNetLwfWinForwardToIntNet: return '%s'\n",
+             fDropIt ? (fDontDrop ? "do not drop (some)" : "drop it") : "do not drop (any)"));
+    return fDropIt && !fDontDrop; /* Drop the list if ALL its buffers are being dropped! */
+}
+
+DECLINLINE(bool) vboxNetLwfWinIsRunning(PVBOXNETLWF_MODULE pModule)
+{
+    Log(("vboxNetLwfWinIsRunning: state=%d\n", ASMAtomicReadU32(&pModule->enmState)));
+    return ASMAtomicReadU32(&pModule->enmState) == LwfState_Running;
+}
+
+VOID vboxNetLwfWinSendNetBufferLists(IN NDIS_HANDLE hModuleCtx, IN PNET_BUFFER_LIST pBufLists, IN NDIS_PORT_NUMBER nPort, IN ULONG fFlags)
+{
+    LogFlow(("==>vboxNetLwfWinSendNetBufferLists: module=%p\n", hModuleCtx));
+    PVBOXNETLWF_MODULE pModule = (PVBOXNETLWF_MODULE)hModuleCtx;
+    vboxNetLwfWinDumpPackets("vboxNetLwfWinSendNetBufferLists: got", pBufLists);
+
+    if (!ASMAtomicReadBool(&pModule->fActive))
+    {
+        /*
+         * The trunk is inactive, jusp pass along all packets to the next
+         * underlying driver.
+         */
+        NdisFSendNetBufferLists(pModule->hFilter, pBufLists, nPort, fFlags);
+        return;
+    }
+
+    if (vboxNetLwfWinIsRunning(pModule))
+    {
+        PNET_BUFFER_LIST pNext     = NULL;
+        PNET_BUFFER_LIST pDropHead = NULL;
+        PNET_BUFFER_LIST pDropTail = NULL;
+        PNET_BUFFER_LIST pPassHead = NULL;
+        PNET_BUFFER_LIST pPassTail = NULL;
+        for (PNET_BUFFER_LIST pList = pBufLists; pList; pList = pNext)
+        {
+            pNext = NET_BUFFER_LIST_NEXT_NBL(pList);
+            NET_BUFFER_LIST_NEXT_NBL(pList) = NULL; /* Unlink */
+            if (vboxNetLwfWinForwardToIntNet(pModule, pList, INTNETTRUNKDIR_HOST))
+            {
+                NET_BUFFER_LIST_STATUS(pList) = NDIS_STATUS_SUCCESS;
+                if (pDropHead)
+                {
+                    NET_BUFFER_LIST_NEXT_NBL(pDropTail) = pList;
+                    pDropTail = pList;
+                }
+                else
+                    pDropHead = pDropTail = pList;
+            }
+            else
+            {
+                if (pPassHead)
+                {
+                    NET_BUFFER_LIST_NEXT_NBL(pPassTail) = pList;
+                    pPassTail = pList;
+                }
+                else
+                    pPassHead = pPassTail = pList;
+            }
+        }
+        Assert((pBufLists == pPassHead) || (pBufLists == pDropHead));
+        if (pPassHead)
+        {
+            vboxNetLwfWinDumpPackets("vboxNetLwfWinSendNetBufferLists: passing down", pPassHead);
+            NdisFSendNetBufferLists(pModule->hFilter, pBufLists, nPort, fFlags);
+        }
+        if (pDropHead)
+        {
+            vboxNetLwfWinDumpPackets("vboxNetLwfWinSendNetBufferLists: consumed", pDropHead);
+            NdisFSendNetBufferListsComplete(pModule->hFilter, pDropHead,
+                                            fFlags & NDIS_SEND_FLAGS_DISPATCH_LEVEL ? NDIS_SEND_COMPLETE_FLAGS_DISPATCH_LEVEL : 0);
+        }
+    }
+    else
+    {
+        for (PNET_BUFFER_LIST pList = pBufLists; pList; pList = NET_BUFFER_LIST_NEXT_NBL(pList))
+        {
+            NET_BUFFER_LIST_STATUS(pList) = NDIS_STATUS_PAUSED;
+        }
+        vboxNetLwfWinDumpPackets("vboxNetLwfWinSendNetBufferLists: consumed", pBufLists);
+        NdisFSendNetBufferListsComplete(pModule->hFilter, pBufLists,
+                                        fFlags & NDIS_SEND_FLAGS_DISPATCH_LEVEL ? NDIS_SEND_COMPLETE_FLAGS_DISPATCH_LEVEL : 0);
+
+    }
+    LogFlow(("<==vboxNetLwfWinSendNetBufferLists\n"));
+}
+
+VOID vboxNetLwfWinSendNetBufferListsComplete(IN NDIS_HANDLE hModuleCtx, IN PNET_BUFFER_LIST pBufLists, IN ULONG fFlags)
+{
+    LogFlow(("==>vboxNetLwfWinSendNetBufferListsComplete: module=%p\n", hModuleCtx));
+    PVBOXNETLWF_MODULE pModule = (PVBOXNETLWF_MODULE)hModuleCtx;
+    PNET_BUFFER_LIST pList = pBufLists;
+    PNET_BUFFER_LIST pNextList;
+    PNET_BUFFER_LIST pPrevList = NULL;
+    while (pList)
+    {
+        pNextList = NET_BUFFER_LIST_NEXT_NBL(pList);
+        if (pList->SourceHandle == pModule->hFilter)
+        {
+            /* We allocated this NET_BUFFER_LIST, let's free it up */
+            Assert(NET_BUFFER_LIST_FIRST_NB(pList));
+            Assert(NET_BUFFER_FIRST_MDL(NET_BUFFER_LIST_FIRST_NB(pList)));
+            /*
+             * All our NBLs hold a single NB each, no need to iterate over a list.
+             * There is no need to free an associated NB explicitly either, as it was
+             * preallocated with NBL structure.
+             */
+            Assert(!NET_BUFFER_NEXT_NB(NET_BUFFER_LIST_FIRST_NB(pList)));
+            vboxNetLwfWinFreeMdlChain(NET_BUFFER_FIRST_MDL(NET_BUFFER_LIST_FIRST_NB(pList)));
+            /* Unlink this list from the chain */
+            if (pPrevList)
+                NET_BUFFER_LIST_NEXT_NBL(pPrevList) = pNextList;
+            else
+                pBufLists = pNextList;
+            Log(("vboxNetLwfWinSendNetBufferListsComplete: our list %p, next=%p, previous=%p, head=%p\n", pList, pNextList, pPrevList, pBufLists));
+            NdisFreeNetBufferList(pList);
+#ifdef VBOXNETLWF_SYNC_SEND
+            Log4(("vboxNetLwfWinSendNetBufferListsComplete: freed NBL+NB 0x%p\n", pList));
+            KeSetEvent(&pModule->EventWire, 0, FALSE);
+#else /* !VBOXNETLWF_SYNC_SEND */
+            Log4(("vboxNetLwfWinSendNetBufferListsComplete: freed NBL+NB+MDL+Data 0x%p\n", pList));
+            Assert(ASMAtomicReadS32(&pModule->cPendingBuffers) > 0);
+            if (ASMAtomicDecS32(&pModule->cPendingBuffers) == 0)
+                NdisSetEvent(&pModule->EventSendComplete);
+#endif /* !VBOXNETLWF_SYNC_SEND */
+        }
+        else
+        {
+            pPrevList = pList;
+            Log(("vboxNetLwfWinSendNetBufferListsComplete: passing list %p, next=%p, previous=%p, head=%p\n", pList, pNextList, pPrevList, pBufLists));
+        }
+        pList = pNextList;
+    }
+    if (pBufLists)
+    {
+        /* There are still lists remaining in the chain, pass'em up */
+        NdisFSendNetBufferListsComplete(pModule->hFilter, pBufLists, fFlags);
+    }
+    LogFlow(("<==vboxNetLwfWinSendNetBufferListsComplete\n"));
+}
+
+VOID vboxNetLwfWinReceiveNetBufferLists(IN NDIS_HANDLE hModuleCtx,
+                                        IN PNET_BUFFER_LIST pBufLists,
+                                        IN NDIS_PORT_NUMBER nPort,
+                                        IN ULONG nBufLists,
+                                        IN ULONG fFlags)
+{
+    /// @todo Do we need loopback handling?
+    LogFlow(("==>vboxNetLwfWinReceiveNetBufferLists: module=%p\n", hModuleCtx));
+    PVBOXNETLWF_MODULE pModule = (PVBOXNETLWF_MODULE)hModuleCtx;
+    vboxNetLwfWinDumpPackets("vboxNetLwfWinReceiveNetBufferLists: got", pBufLists);
+
+    if (!ASMAtomicReadBool(&pModule->fActive))
+    {
+        /*
+         * The trunk is inactive, just pass along all packets to the next
+         * overlying driver.
+         */
+        NdisFIndicateReceiveNetBufferLists(pModule->hFilter, pBufLists, nPort, nBufLists, fFlags);
+        LogFlow(("<==vboxNetLwfWinReceiveNetBufferLists: inactive trunk\n"));
+        return;
+    }
+
+    if (vboxNetLwfWinIsRunning(pModule))
+    {
+        if (NDIS_TEST_RECEIVE_CANNOT_PEND(fFlags))
+        {
+            for (PNET_BUFFER_LIST pList = pBufLists; pList; pList = NET_BUFFER_LIST_NEXT_NBL(pList))
+            {
+                PNET_BUFFER_LIST pNext = NET_BUFFER_LIST_NEXT_NBL(pList);
+                NET_BUFFER_LIST_NEXT_NBL(pList) = NULL; /* Unlink temporarily */
+                if (!vboxNetLwfWinForwardToIntNet(pModule, pList, INTNETTRUNKDIR_WIRE))
+                {
+                    vboxNetLwfWinDumpPackets("vboxNetLwfWinReceiveNetBufferLists: passing up", pList);
+                    NdisFIndicateReceiveNetBufferLists(pModule->hFilter, pList, nPort, nBufLists, fFlags);
+                }
+                NET_BUFFER_LIST_NEXT_NBL(pList) = pNext; /* Restore the link */
+            }
+        }
+        else
+        {
+            /* We collect dropped NBLs in a separate list in order to "return" them. */
+            PNET_BUFFER_LIST pNext     = NULL;
+            PNET_BUFFER_LIST pDropHead = NULL;
+            PNET_BUFFER_LIST pDropTail = NULL;
+            PNET_BUFFER_LIST pPassHead = NULL;
+            PNET_BUFFER_LIST pPassTail = NULL;
+            ULONG nDrop = 0, nPass = 0;
+            for (PNET_BUFFER_LIST pList = pBufLists; pList; pList = pNext)
+            {
+                pNext = NET_BUFFER_LIST_NEXT_NBL(pList);
+                NET_BUFFER_LIST_NEXT_NBL(pList) = NULL; /* Unlink */
+                if (vboxNetLwfWinForwardToIntNet(pModule, pList, INTNETTRUNKDIR_WIRE))
+                {
+                    if (nDrop++)
+                    {
+                        NET_BUFFER_LIST_NEXT_NBL(pDropTail) = pList;
+                        pDropTail = pList;
+                    }
+                    else
+                        pDropHead = pDropTail = pList;
+                }
+                else
+                {
+                    if (nPass++)
+                    {
+                        NET_BUFFER_LIST_NEXT_NBL(pPassTail) = pList;
+                        pPassTail = pList;
+                    }
+                    else
+                        pPassHead = pPassTail = pList;
+                }
+            }
+            Assert((pBufLists == pPassHead) || (pBufLists == pDropHead));
+            Assert(nDrop + nPass == nBufLists);
+            if (pPassHead)
+            {
+                vboxNetLwfWinDumpPackets("vboxNetLwfWinReceiveNetBufferLists: passing up", pPassHead);
+                NdisFIndicateReceiveNetBufferLists(pModule->hFilter, pPassHead, nPort, nPass, fFlags);
+            }
+            if (pDropHead)
+            {
+                vboxNetLwfWinDumpPackets("vboxNetLwfWinReceiveNetBufferLists: consumed", pDropHead);
+                NdisFReturnNetBufferLists(pModule->hFilter, pDropHead,
+                                          fFlags & NDIS_RECEIVE_FLAGS_DISPATCH_LEVEL ? NDIS_RETURN_FLAGS_DISPATCH_LEVEL : 0);
+            }
+        }
+
+    }
+    else
+    {
+        vboxNetLwfWinDumpPackets("vboxNetLwfWinReceiveNetBufferLists: consumed", pBufLists);
+        if ((fFlags & NDIS_RECEIVE_FLAGS_RESOURCES) == 0)
+            NdisFReturnNetBufferLists(pModule->hFilter, pBufLists,
+                                      fFlags & NDIS_RECEIVE_FLAGS_DISPATCH_LEVEL ? NDIS_RETURN_FLAGS_DISPATCH_LEVEL : 0);
+    }
+    LogFlow(("<==vboxNetLwfWinReceiveNetBufferLists\n"));
+}
+
+VOID vboxNetLwfWinReturnNetBufferLists(IN NDIS_HANDLE hModuleCtx, IN PNET_BUFFER_LIST pBufLists, IN ULONG fFlags)
+{
+    LogFlow(("==>vboxNetLwfWinReturnNetBufferLists: module=%p\n", hModuleCtx));
+    PVBOXNETLWF_MODULE pModule = (PVBOXNETLWF_MODULE)hModuleCtx;
+    PNET_BUFFER_LIST pList = pBufLists;
+    PNET_BUFFER_LIST pNextList;
+    PNET_BUFFER_LIST pPrevList = NULL;
+    /** @todo Move common part into a separate function to be used by vboxNetLwfWinSendNetBufferListsComplete() as well */
+    while (pList)
+    {
+        pNextList = NET_BUFFER_LIST_NEXT_NBL(pList);
+        if (pList->SourceHandle == pModule->hFilter)
+        {
+            /* We allocated this NET_BUFFER_LIST, let's free it up */
+            Assert(NET_BUFFER_LIST_FIRST_NB(pList));
+            Assert(NET_BUFFER_FIRST_MDL(NET_BUFFER_LIST_FIRST_NB(pList)));
+            /*
+             * All our NBLs hold a single NB each, no need to iterate over a list.
+             * There is no need to free an associated NB explicitly either, as it was
+             * preallocated with NBL structure.
+             */
+            vboxNetLwfWinFreeMdlChain(NET_BUFFER_FIRST_MDL(NET_BUFFER_LIST_FIRST_NB(pList)));
+            /* Unlink this list from the chain */
+            if (pPrevList)
+                NET_BUFFER_LIST_NEXT_NBL(pPrevList) = pNextList;
+            else
+                pBufLists = pNextList;
+            NdisFreeNetBufferList(pList);
+#ifdef VBOXNETLWF_SYNC_SEND
+            Log4(("vboxNetLwfWinReturnNetBufferLists: freed NBL+NB 0x%p\n", pList));
+            KeSetEvent(&pModule->EventHost, 0, FALSE);
+#else /* !VBOXNETLWF_SYNC_SEND */
+            Log4(("vboxNetLwfWinReturnNetBufferLists: freed NBL+NB+MDL+Data 0x%p\n", pList));
+            Assert(ASMAtomicReadS32(&pModule->cPendingBuffers) > 0);
+            if (ASMAtomicDecS32(&pModule->cPendingBuffers) == 0)
+                NdisSetEvent(&pModule->EventSendComplete);
+#endif /* !VBOXNETLWF_SYNC_SEND */
+        }
+        else
+            pPrevList = pList;
+        pList = pNextList;
+    }
+    if (pBufLists)
+    {
+        /* There are still lists remaining in the chain, pass'em up */
+        NdisFReturnNetBufferLists(pModule->hFilter, pBufLists, fFlags);
+    }
+    LogFlow(("<==vboxNetLwfWinReturnNetBufferLists\n"));
+}
+
+/**
+ * register the filter driver
+ */
+DECLHIDDEN(NDIS_STATUS) vboxNetLwfWinRegister(PDRIVER_OBJECT pDriverObject, PUNICODE_STRING pRegistryPathStr)
+{
+    RT_NOREF1(pRegistryPathStr);
+    NDIS_FILTER_DRIVER_CHARACTERISTICS FChars;
+    NDIS_STRING FriendlyName;
+    NDIS_STRING UniqueName;
+    NDIS_STRING ServiceName;
+
+    NdisInitUnicodeString(&FriendlyName, VBOXNETLWF_NAME_FRIENDLY);
+    NdisInitUnicodeString(&UniqueName, VBOXNETLWF_NAME_UNIQUE);
+    NdisInitUnicodeString(&ServiceName, VBOXNETLWF_NAME_SERVICE);
+
+    NdisZeroMemory(&FChars, sizeof (FChars));
+
+    FChars.Header.Type = NDIS_OBJECT_TYPE_FILTER_DRIVER_CHARACTERISTICS;
+    FChars.Header.Size = sizeof(NDIS_FILTER_DRIVER_CHARACTERISTICS);
+    FChars.Header.Revision = NDIS_FILTER_CHARACTERISTICS_REVISION_1;
+
+    FChars.MajorNdisVersion = VBOXNETLWF_VERSION_NDIS_MAJOR;
+    FChars.MinorNdisVersion = VBOXNETLWF_VERSION_NDIS_MINOR;
+
+    FChars.FriendlyName = FriendlyName;
+    FChars.UniqueName = UniqueName;
+    FChars.ServiceName = ServiceName;
+
+    /* Mandatory functions */
+    FChars.AttachHandler = vboxNetLwfWinAttach;
+    FChars.DetachHandler = vboxNetLwfWinDetach;
+    FChars.RestartHandler = vboxNetLwfWinRestart;
+    FChars.PauseHandler = vboxNetLwfWinPause;
+
+    /* Optional functions, non changeble at run-time */
+    FChars.OidRequestHandler = vboxNetLwfWinOidRequest;
+    FChars.OidRequestCompleteHandler = vboxNetLwfWinOidRequestComplete;
+    //FChars.CancelOidRequestHandler = vboxNetLwfWinCancelOidRequest;
+    FChars.StatusHandler = vboxNetLwfWinStatus;
+    //FChars.NetPnPEventHandler = vboxNetLwfWinPnPEvent;
+
+    /* Datapath functions */
+    FChars.SendNetBufferListsHandler = vboxNetLwfWinSendNetBufferLists;
+    FChars.SendNetBufferListsCompleteHandler = vboxNetLwfWinSendNetBufferListsComplete;
+    FChars.ReceiveNetBufferListsHandler = vboxNetLwfWinReceiveNetBufferLists;
+    FChars.ReturnNetBufferListsHandler = vboxNetLwfWinReturnNetBufferLists;
+
+    pDriverObject->DriverUnload = vboxNetLwfWinUnloadDriver;
+
+    NDIS_STATUS Status;
+    g_VBoxNetLwfGlobals.hFilterDriver = NULL;
+    Log(("vboxNetLwfWinRegister: registering filter driver...\n"));
+    Status = NdisFRegisterFilterDriver(pDriverObject,
+                                       (NDIS_HANDLE)&g_VBoxNetLwfGlobals,
+                                       &FChars,
+                                       &g_VBoxNetLwfGlobals.hFilterDriver);
+    Assert(Status == STATUS_SUCCESS);
+    if (Status == STATUS_SUCCESS)
+    {
+        Log(("vboxNetLwfWinRegister: successfully registered filter driver; registering device...\n"));
+        Status = vboxNetLwfWinDevCreate(&g_VBoxNetLwfGlobals);
+        Assert(Status == STATUS_SUCCESS);
+        Log(("vboxNetLwfWinRegister: vboxNetLwfWinDevCreate() returned 0x%x\n", Status));
+    }
+    else
+    {
+        LogError(("vboxNetLwfWinRegister: failed to register filter driver, status=0x%x", Status));
+    }
+    return Status;
+}
+
+static int vboxNetLwfWinStartInitIdcThread()
+{
+    int rc = VERR_INVALID_STATE;
+
+    if (ASMAtomicCmpXchgU32(&g_VBoxNetLwfGlobals.enmIdcState, LwfIdcState_Connecting, LwfIdcState_Disconnected))
+    {
+        Log(("vboxNetLwfWinStartInitIdcThread: IDC state change Diconnected -> Connecting\n"));
+
+        NTSTATUS Status = PsCreateSystemThread(&g_VBoxNetLwfGlobals.hInitIdcThread,
+                                               THREAD_ALL_ACCESS,
+                                               NULL,
+                                               NULL,
+                                               NULL,
+                                               vboxNetLwfWinInitIdcWorker,
+                                               &g_VBoxNetLwfGlobals);
+        Log(("vboxNetLwfWinStartInitIdcThread: create IDC initialization thread, status=0x%x\n", Status));
+        if (Status != STATUS_SUCCESS)
+        {
+            LogError(("vboxNetLwfWinStartInitIdcThread: IDC initialization failed (system thread creation, status=0x%x)\n", Status));
+            /*
+             * We failed to init IDC and there will be no second chance.
+             */
+            Log(("vboxNetLwfWinStartInitIdcThread: IDC state change Connecting -> Diconnected\n"));
+            ASMAtomicWriteU32(&g_VBoxNetLwfGlobals.enmIdcState, LwfIdcState_Disconnected);
+        }
+        rc = RTErrConvertFromNtStatus(Status);
+    }
+    return rc;
+}
+
+static void vboxNetLwfWinStopInitIdcThread()
+{
+}
+
+
+RT_C_DECLS_BEGIN
+
+NTSTATUS DriverEntry(IN PDRIVER_OBJECT pDriverObject, IN PUNICODE_STRING pRegistryPath);
+
+RT_C_DECLS_END
+
+NTSTATUS DriverEntry(IN PDRIVER_OBJECT pDriverObject, IN PUNICODE_STRING pRegistryPath)
+{
+    NDIS_STATUS Status = NDIS_STATUS_SUCCESS;
+    int rc;
+
+    /* the idc registration is initiated via IOCTL since our driver
+     * can be loaded when the VBoxDrv is not in case we are a Ndis IM driver */
+    rc = vboxNetLwfWinInitBase();
+    AssertRC(rc);
+    if (RT_SUCCESS(rc))
+    {
+        NdisZeroMemory(&g_VBoxNetLwfGlobals, sizeof (g_VBoxNetLwfGlobals));
+        RTListInit(&g_VBoxNetLwfGlobals.listModules);
+        NdisAllocateSpinLock(&g_VBoxNetLwfGlobals.Lock);
+        /*
+         * We choose to ignore IDC initialization errors here because if we fail to load
+         * our filter the upper protocols won't bind to the associated adapter, causing
+         * network failure at the host. Better to have non-working filter than broken
+         * networking on the host.
+         */
+        rc = vboxNetLwfWinStartInitIdcThread();
+        AssertRC(rc);
+
+        Status = vboxNetLwfWinRegister(pDriverObject, pRegistryPath);
+        Assert(Status == STATUS_SUCCESS);
+        if (Status == NDIS_STATUS_SUCCESS)
+        {
+            Log(("NETLWF: started successfully\n"));
+            return STATUS_SUCCESS;
+        }
+        NdisFreeSpinLock(&g_VBoxNetLwfGlobals.Lock);
+        vboxNetLwfWinFini();
+    }
+    else
+    {
+        Status = NDIS_STATUS_FAILURE;
+    }
+
+    return Status;
+}
+
+
+static VOID vboxNetLwfWinUnloadDriver(IN PDRIVER_OBJECT pDriver)
+{
+    RT_NOREF1(pDriver);
+    LogFlow(("==>vboxNetLwfWinUnloadDriver: driver=%p\n", pDriver));
+    vboxNetLwfWinDevDestroy(&g_VBoxNetLwfGlobals);
+    NdisFDeregisterFilterDriver(g_VBoxNetLwfGlobals.hFilterDriver);
+    NdisFreeSpinLock(&g_VBoxNetLwfGlobals.Lock);
+    LogFlow(("<==vboxNetLwfWinUnloadDriver\n"));
+    vboxNetLwfWinFini();
+}
+
+static const char *vboxNetLwfWinIdcStateToText(uint32_t enmState)
+{
+    switch (enmState)
+    {
+        case LwfIdcState_Disconnected: return "Disconnected";
+        case LwfIdcState_Connecting: return "Connecting";
+        case LwfIdcState_Connected: return "Connected";
+        case LwfIdcState_Stopping: return "Stopping";
+    }
+    return "Unknown";
+}
+
+static VOID vboxNetLwfWinInitIdcWorker(PVOID pvContext)
+{
+    int rc;
+    PVBOXNETLWFGLOBALS pGlobals = (PVBOXNETLWFGLOBALS)pvContext;
+
+    while (ASMAtomicReadU32(&pGlobals->enmIdcState) == LwfIdcState_Connecting)
+    {
+        rc = vboxNetFltInitIdc(&g_VBoxNetFltGlobals);
+        if (RT_SUCCESS(rc))
+        {
+            if (!ASMAtomicCmpXchgU32(&pGlobals->enmIdcState, LwfIdcState_Connected, LwfIdcState_Connecting))
+            {
+                /* The state has been changed (the only valid transition is to "Stopping"), undo init */
+                rc = vboxNetFltTryDeleteIdc(&g_VBoxNetFltGlobals);
+                Log(("vboxNetLwfWinInitIdcWorker: state change (Connecting -> %s) while initializing IDC, deleted IDC, rc=0x%x\n",
+                     vboxNetLwfWinIdcStateToText(ASMAtomicReadU32(&pGlobals->enmIdcState)), rc));
+            }
+            else
+            {
+                Log(("vboxNetLwfWinInitIdcWorker: IDC state change Connecting -> Connected\n"));
+            }
+        }
+        else
+        {
+            LARGE_INTEGER WaitIn100nsUnits;
+            WaitIn100nsUnits.QuadPart = -(LONGLONG)10000000; /* 1 sec */
+            KeDelayExecutionThread(KernelMode, FALSE /* non-alertable */, &WaitIn100nsUnits);
+        }
+    }
+    PsTerminateSystemThread(STATUS_SUCCESS);
+}
+
+static int vboxNetLwfWinTryFiniIdc()
+{
+    int rc = VINF_SUCCESS;
+    NTSTATUS Status;
+    PKTHREAD pThread = NULL;
+    uint32_t enmPrevState = ASMAtomicXchgU32(&g_VBoxNetLwfGlobals.enmIdcState, LwfIdcState_Stopping);
+
+    Log(("vboxNetLwfWinTryFiniIdc: IDC state change %s -> Stopping\n", vboxNetLwfWinIdcStateToText(enmPrevState)));
+
+    switch (enmPrevState)
+    {
+        case LwfIdcState_Disconnected:
+            /* Have not even attempted to connect -- nothing to do. */
+            break;
+        case LwfIdcState_Stopping:
+            /* Impossible, but another thread is alreading doing FiniIdc, bail out */
+            LogError(("vboxNetLwfWinTryFiniIdc: called in 'Stopping' state\n"));
+            rc = VERR_INVALID_STATE;
+            break;
+        case LwfIdcState_Connecting:
+            /* the worker thread is running, let's wait for it to stop */
+            Status = ObReferenceObjectByHandle(g_VBoxNetLwfGlobals.hInitIdcThread,
+                                               THREAD_ALL_ACCESS, NULL, KernelMode,
+                                               (PVOID*)&pThread, NULL);
+            if (Status == STATUS_SUCCESS)
+            {
+                KeWaitForSingleObject(pThread, Executive, KernelMode, FALSE, NULL);
+                ObDereferenceObject(pThread);
+            }
+            else
+            {
+                LogError(("vboxNetLwfWinTryFiniIdc: ObReferenceObjectByHandle(%p) failed with 0x%x\n",
+                     g_VBoxNetLwfGlobals.hInitIdcThread, Status));
+            }
+            rc = RTErrConvertFromNtStatus(Status);
+            break;
+        case LwfIdcState_Connected:
+            /* the worker succeeded in IDC init and terminated */
+            rc = vboxNetFltTryDeleteIdc(&g_VBoxNetFltGlobals);
+            Log(("vboxNetLwfWinTryFiniIdc: deleted IDC, rc=0x%x\n", rc));
+            break;
+    }
+    return rc;
+}
+
+static void vboxNetLwfWinFiniBase()
+{
+    vboxNetFltDeleteGlobals(&g_VBoxNetFltGlobals);
+
+    /*
+     * Undo the work done during start (in reverse order).
+     */
+    memset(&g_VBoxNetFltGlobals, 0, sizeof(g_VBoxNetFltGlobals));
+
+    RTLogDestroy(RTLogRelSetDefaultInstance(NULL));
+    RTLogDestroy(RTLogSetDefaultInstance(NULL));
+
+    RTR0Term();
+}
+
+static int vboxNetLwfWinInitBase()
+{
+    int rc = RTR0Init(0);
+    if (!RT_SUCCESS(rc))
+        return rc;
+
+    memset(&g_VBoxNetFltGlobals, 0, sizeof(g_VBoxNetFltGlobals));
+    rc = vboxNetFltInitGlobals(&g_VBoxNetFltGlobals);
+    if (!RT_SUCCESS(rc))
+        RTR0Term();
+
+    return rc;
+}
+
+static int vboxNetLwfWinFini()
+{
+    int rc = vboxNetLwfWinTryFiniIdc();
+    if (RT_SUCCESS(rc))
+    {
+        vboxNetLwfWinFiniBase();
+    }
+    return rc;
+}
+
+
+/*
+ *
+ * The OS specific interface definition
+ *
+ */
+
+
+bool vboxNetFltOsMaybeRediscovered(PVBOXNETFLTINS pThis)
+{
+    LogFlow(("==>vboxNetFltOsMaybeRediscovered: instance=%p\n", pThis));
+    LogFlow(("<==vboxNetFltOsMaybeRediscovered: return %RTbool\n", !ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost)));
+    /* AttachToInterface true if disconnected */
+    return !ASMAtomicUoReadBool(&pThis->fDisconnectedFromHost);
+}
+
+int vboxNetFltPortOsXmit(PVBOXNETFLTINS pThis, void *pvIfData, PINTNETSG pSG, uint32_t fDst)
+{
+    RT_NOREF1(pvIfData);
+    int rc = VINF_SUCCESS;
+
+    PVBOXNETLWF_MODULE pModule = (PVBOXNETLWF_MODULE)pThis->u.s.WinIf.hModuleCtx;
+    LogFlow(("==>vboxNetFltPortOsXmit: instance=%p module=%p\n", pThis, pModule));
+    if (!pModule)
+    {
+        LogFlow(("<==vboxNetFltPortOsXmit: pModule is null, return %d\n", VERR_INTERNAL_ERROR));
+        return VERR_INTERNAL_ERROR;
+    }
+    /* Prevent going into "paused" state until all transmissions have been completed. */
+    NDIS_WAIT_FOR_MUTEX(&pModule->InTransmit);
+    /* Ignore all sends if the stack is paused or being paused, etc... */
+    if (!vboxNetLwfWinIsRunning(pModule))
+    {
+        NDIS_RELEASE_MUTEX(&pModule->InTransmit);
+        return VINF_SUCCESS;
+    }
+
+    vboxNetLwfWinDumpPacket(pSG,   !(fDst & INTNETTRUNKDIR_WIRE) ? "intnet --> host"
+                                 : !(fDst & INTNETTRUNKDIR_HOST) ? "intnet --> wire" : "intnet --> all");
+
+    /*
+     * There are two possible strategies to deal with incoming SGs:
+     * 1) make a copy of data and complete asynchronously;
+     * 2) complete synchronously using the original data buffers.
+     * Before we consider implementing (1) it is quite interesting to see
+     * how well (2) performs. So we block until our requests are complete.
+     * Actually there is third possibility -- to use SG retain/release
+     * callbacks, but those seem not be fully implemented yet.
+     * Note that ansynchronous completion will require different implementation
+     * of vboxNetLwfWinPause(), not relying on InTransmit mutex.
+     */
+#ifdef VBOXNETLWF_SYNC_SEND
+    PVOID aEvents[2]; /* To wire and to host */
+    ULONG nEvents = 0;
+    LARGE_INTEGER timeout;
+    timeout.QuadPart = -(LONGLONG)10000000; /* 1 sec */
+#endif /* VBOXNETLWF_SYNC_SEND */
+    if (fDst & INTNETTRUNKDIR_WIRE)
+    {
+        PNET_BUFFER_LIST pBufList = vboxNetLwfWinSGtoNB(pModule, pSG);
+        if (pBufList)
+        {
+            vboxNetLwfWinDumpPackets("vboxNetFltPortOsXmit: sending down", pBufList);
+#ifdef VBOXNETLWF_SYNC_SEND
+            aEvents[nEvents++] = &pModule->EventWire;
+#else /* !VBOXNETLWF_SYNC_SEND */
+            if (ASMAtomicIncS32(&pModule->cPendingBuffers) == 1)
+                NdisResetEvent(&pModule->EventSendComplete);
+#endif /* !VBOXNETLWF_SYNC_SEND */
+            NdisFSendNetBufferLists(pModule->hFilter, pBufList, NDIS_DEFAULT_PORT_NUMBER, 0); /** @todo sendFlags! */
+        }
+    }
+    if (fDst & INTNETTRUNKDIR_HOST)
+    {
+        PNET_BUFFER_LIST pBufList = vboxNetLwfWinSGtoNB(pModule, pSG);
+        if (pBufList)
+        {
+            vboxNetLwfWinDumpPackets("vboxNetFltPortOsXmit: sending up", pBufList);
+#ifdef VBOXNETLWF_SYNC_SEND
+            aEvents[nEvents++] = &pModule->EventHost;
+#else /* !VBOXNETLWF_SYNC_SEND */
+            if (ASMAtomicIncS32(&pModule->cPendingBuffers) == 1)
+                NdisResetEvent(&pModule->EventSendComplete);
+#endif /* !VBOXNETLWF_SYNC_SEND */
+            NdisFIndicateReceiveNetBufferLists(pModule->hFilter, pBufList, NDIS_DEFAULT_PORT_NUMBER, 1, 0);
+        }
+    }
+#ifdef VBOXNETLWF_SYNC_SEND
+    if (nEvents)
+    {
+        NTSTATUS Status = KeWaitForMultipleObjects(nEvents, aEvents, WaitAll, Executive, KernelMode, FALSE, &timeout, NULL);
+        if (Status != STATUS_SUCCESS)
+        {
+            LogError(("vboxNetFltPortOsXmit: KeWaitForMultipleObjects() failed with 0x%x\n", Status));
+            if (Status == STATUS_TIMEOUT)
+                rc = VERR_TIMEOUT;
+            else
+                rc = RTErrConvertFromNtStatus(Status);
+        }
+    }
+#endif /* VBOXNETLWF_SYNC_SEND */
+    NDIS_RELEASE_MUTEX(&pModule->InTransmit);
+
+    LogFlow(("<==vboxNetFltPortOsXmit: return %d\n", rc));
+    return rc;
+}
+
+
+NDIS_IO_WORKITEM_FUNCTION vboxNetLwfWinToggleOffloading;
+
+VOID vboxNetLwfWinToggleOffloading(PVOID WorkItemContext, NDIS_HANDLE NdisIoWorkItemHandle)
+{
+    /* WARNING! Call this with IRQL=Passive! */
+    RT_NOREF1(NdisIoWorkItemHandle);
+    PVBOXNETLWF_MODULE pModuleCtx = (PVBOXNETLWF_MODULE)WorkItemContext;
+
+    if (ASMAtomicReadBool(&pModuleCtx->fActive))
+    {
+        /* Disable offloading temporarily by indicating offload config change. */
+        /** @todo Be sure to revise this when implementing offloading support! */
+        vboxNetLwfWinIndicateOffload(pModuleCtx, pModuleCtx->pDisabledOffloadConfig);
+        Log(("vboxNetLwfWinToggleOffloading: set offloading off\n"));
+    }
+    else
+    {
+        /* The filter is inactive -- restore offloading configuration. */
+        if (pModuleCtx->fOffloadConfigValid)
+        {
+            vboxNetLwfWinIndicateOffload(pModuleCtx, pModuleCtx->pSavedOffloadConfig);
+            Log(("vboxNetLwfWinToggleOffloading: restored offloading config\n"));
+        }
+        else
+            DbgPrint("VBoxNetLwf: no saved offload config to restore for %s\n", pModuleCtx->szMiniportName);
+    }
+}
+
+
+void vboxNetFltPortOsSetActive(PVBOXNETFLTINS pThis, bool fActive)
+{
+    PVBOXNETLWF_MODULE pModuleCtx = (PVBOXNETLWF_MODULE)pThis->u.s.WinIf.hModuleCtx;
+    LogFlow(("==>vboxNetFltPortOsSetActive: instance=%p module=%p fActive=%RTbool\n", pThis, pModuleCtx, fActive));
+    if (!pModuleCtx)
+    {
+        LogFlow(("<==vboxNetFltPortOsSetActive: pModuleCtx is null\n"));
+        return;
+    }
+
+    NDIS_STATUS Status = STATUS_SUCCESS;
+    bool fOldActive = ASMAtomicXchgBool(&pModuleCtx->fActive, fActive);
+    if (fOldActive != fActive)
+    {
+        NdisQueueIoWorkItem(pModuleCtx->hWorkItem, vboxNetLwfWinToggleOffloading, pModuleCtx);
+        Status = vboxNetLwfWinSetPacketFilter(pModuleCtx, fActive);
+        LogFlow(("<==vboxNetFltPortOsSetActive: vboxNetLwfWinSetPacketFilter() returned 0x%x\n", Status));
+    }
+    else
+        LogFlow(("<==vboxNetFltPortOsSetActive: no change, remain %sactive\n", fActive ? "":"in"));
+}
+
+int vboxNetFltOsDisconnectIt(PVBOXNETFLTINS pThis)
+{
+    RT_NOREF1(pThis);
+    LogFlow(("==>vboxNetFltOsDisconnectIt: instance=%p\n", pThis));
+    LogFlow(("<==vboxNetFltOsDisconnectIt: return 0\n"));
+    return VINF_SUCCESS;
+}
+
+int vboxNetFltOsConnectIt(PVBOXNETFLTINS pThis)
+{
+    RT_NOREF1(pThis);
+    LogFlow(("==>vboxNetFltOsConnectIt: instance=%p\n", pThis));
+    LogFlow(("<==vboxNetFltOsConnectIt: return 0\n"));
+    return VINF_SUCCESS;
+}
+
+/*
+ * Uncommenting the following line produces debug log messages on IP address changes,
+ * including wired interfaces. No actual calls to a switch port are made. This is for
+ * debug purposes only!
+ * #define VBOXNETLWFWIN_DEBUGIPADDRNOTIF 1
+ */
+static void __stdcall vboxNetLwfWinIpAddrChangeCallback(IN PVOID pvCtx,
+                                                        IN PMIB_UNICASTIPADDRESS_ROW pRow,
+                                                        IN MIB_NOTIFICATION_TYPE enmNotifType)
+{
+    PVBOXNETFLTINS pThis = (PVBOXNETFLTINS)pvCtx;
+
+    /* We are only interested in add or remove notifications. */
+    bool fAdded;
+    if (enmNotifType == MibAddInstance)
+        fAdded = true;
+    else if (enmNotifType == MibDeleteInstance)
+        fAdded = false;
+    else
+        return;
+
+    if (   pRow
+#ifndef VBOXNETLWFWIN_DEBUGIPADDRNOTIF
+        && pThis->pSwitchPort->pfnNotifyHostAddress
+#endif /* !VBOXNETLWFWIN_DEBUGIPADDRNOTIF */
+       )
+    {
+        switch (pRow->Address.si_family)
+        {
+            case AF_INET:
+                if (   IN4_IS_ADDR_LINKLOCAL(&pRow->Address.Ipv4.sin_addr)
+                    || pRow->Address.Ipv4.sin_addr.s_addr == IN4ADDR_LOOPBACK)
+                {
+                    Log(("vboxNetLwfWinIpAddrChangeCallback: ignoring %s address (%RTnaipv4)\n",
+                         pRow->Address.Ipv4.sin_addr.s_addr == IN4ADDR_LOOPBACK ? "loopback" : "link-local",
+                         pRow->Address.Ipv4.sin_addr));
+                    break;
+                }
+                Log(("vboxNetLwfWinIpAddrChangeCallback: %s IPv4 addr=%RTnaipv4 on luid=(%u,%u)\n",
+                     fAdded ? "add" : "remove", pRow->Address.Ipv4.sin_addr,
+                     pRow->InterfaceLuid.Info.IfType, pRow->InterfaceLuid.Info.NetLuidIndex));
+#ifndef VBOXNETLWFWIN_DEBUGIPADDRNOTIF
+                pThis->pSwitchPort->pfnNotifyHostAddress(pThis->pSwitchPort, fAdded, kIntNetAddrType_IPv4,
+                                                         &pRow->Address.Ipv4.sin_addr);
+#endif /* !VBOXNETLWFWIN_DEBUGIPADDRNOTIF */
+                break;
+            case AF_INET6:
+                if (Ipv6AddressScope(pRow->Address.Ipv6.sin6_addr.u.Byte) <= ScopeLevelLink)
+                {
+                    Log(("vboxNetLwfWinIpAddrChangeCallback: ignoring link-local address (%RTnaipv6)\n",
+                         &pRow->Address.Ipv6.sin6_addr));
+                    break;
+                }
+                Log(("vboxNetLwfWinIpAddrChangeCallback: %s IPv6 addr=%RTnaipv6 scope=%d luid=(%u,%u)\n",
+                     fAdded ? "add" : "remove", &pRow->Address.Ipv6.sin6_addr,
+                     Ipv6AddressScope(pRow->Address.Ipv6.sin6_addr.u.Byte),
+                     pRow->InterfaceLuid.Info.IfType, pRow->InterfaceLuid.Info.NetLuidIndex));
+#ifndef VBOXNETLWFWIN_DEBUGIPADDRNOTIF
+                pThis->pSwitchPort->pfnNotifyHostAddress(pThis->pSwitchPort, fAdded, kIntNetAddrType_IPv6,
+                                                         &pRow->Address.Ipv6.sin6_addr);
+#endif /* !VBOXNETLWFWIN_DEBUGIPADDRNOTIF */
+                break;
+        }
+    }
+    else
+        Log(("vboxNetLwfWinIpAddrChangeCallback: pRow=%p pfnNotifyHostAddress=%p\n",
+             pRow, pThis->pSwitchPort->pfnNotifyHostAddress));
+}
+
+void vboxNetLwfWinRegisterIpAddrNotifier(PVBOXNETFLTINS pThis)
+{
+    LogFlow(("==>vboxNetLwfWinRegisterIpAddrNotifier: instance=%p\n", pThis));
+    if (   pThis->pSwitchPort
+#ifndef VBOXNETLWFWIN_DEBUGIPADDRNOTIF
+        && pThis->pSwitchPort->pfnNotifyHostAddress
+#endif /* !VBOXNETLWFWIN_DEBUGIPADDRNOTIF */
+       )
+    {
+        NETIO_STATUS Status;
+        /* First we need to go over all host IP addresses and add them via pfnNotifyHostAddress. */
+        PMIB_UNICASTIPADDRESS_TABLE HostIpAddresses = NULL;
+        Status = GetUnicastIpAddressTable(AF_UNSPEC, &HostIpAddresses);
+        if (NETIO_SUCCESS(Status))
+        {
+            for (unsigned i = 0; i < HostIpAddresses->NumEntries; i++)
+                vboxNetLwfWinIpAddrChangeCallback(pThis, &HostIpAddresses->Table[i], MibAddInstance);
+        }
+        else
+            LogError(("vboxNetLwfWinRegisterIpAddrNotifier: GetUnicastIpAddressTable failed with %x\n", Status));
+        /* Now we can register a callback function to keep track of address changes. */
+        Status = NotifyUnicastIpAddressChange(AF_UNSPEC, vboxNetLwfWinIpAddrChangeCallback,
+                                              pThis, false, &pThis->u.s.WinIf.hNotifier);
+        if (NETIO_SUCCESS(Status))
+            Log(("vboxNetLwfWinRegisterIpAddrNotifier: notifier=%p\n", pThis->u.s.WinIf.hNotifier));
+        else
+            LogError(("vboxNetLwfWinRegisterIpAddrNotifier: NotifyUnicastIpAddressChange failed with %x\n", Status));
+    }
+    else
+        pThis->u.s.WinIf.hNotifier = NULL;
+    LogFlow(("<==vboxNetLwfWinRegisterIpAddrNotifier\n"));
+}
+
+void vboxNetLwfWinUnregisterIpAddrNotifier(PVBOXNETFLTINS pThis)
+{
+    Log(("vboxNetLwfWinUnregisterIpAddrNotifier: notifier=%p\n", pThis->u.s.WinIf.hNotifier));
+    if (pThis->u.s.WinIf.hNotifier)
+        CancelMibChangeNotify2(pThis->u.s.WinIf.hNotifier);
+}
+
+void vboxNetFltOsDeleteInstance(PVBOXNETFLTINS pThis)
+{
+    PVBOXNETLWF_MODULE pModuleCtx = (PVBOXNETLWF_MODULE)pThis->u.s.WinIf.hModuleCtx;
+    LogFlow(("==>vboxNetFltOsDeleteInstance: instance=%p module=%p\n", pThis, pModuleCtx));
+    /* Cancel IP address change notifications */
+    vboxNetLwfWinUnregisterIpAddrNotifier(pThis);
+    /* Technically it is possible that the module has already been gone by now. */
+    if (pModuleCtx)
+    {
+        Assert(!pModuleCtx->fActive); /* Deactivation ensures bypass mode */
+        pModuleCtx->pNetFlt = NULL;
+        pThis->u.s.WinIf.hModuleCtx = NULL;
+    }
+    LogFlow(("<==vboxNetFltOsDeleteInstance\n"));
+}
+
+static void vboxNetLwfWinReportCapabilities(PVBOXNETFLTINS pThis, PVBOXNETLWF_MODULE pModuleCtx)
+{
+    if (pThis->pSwitchPort
+        && vboxNetFltTryRetainBusyNotDisconnected(pThis))
+    {
+        pThis->pSwitchPort->pfnReportMacAddress(pThis->pSwitchPort, &pModuleCtx->MacAddr);
+        pThis->pSwitchPort->pfnReportPromiscuousMode(pThis->pSwitchPort,
+                                                     vboxNetLwfWinIsPromiscuous(pModuleCtx));
+        pThis->pSwitchPort->pfnReportGsoCapabilities(pThis->pSwitchPort, 0,
+                                                     INTNETTRUNKDIR_WIRE | INTNETTRUNKDIR_HOST);
+        pThis->pSwitchPort->pfnReportNoPreemptDsts(pThis->pSwitchPort, 0 /* none */);
+        vboxNetFltRelease(pThis, true /*fBusy*/);
+    }
+}
+
+int vboxNetFltOsInitInstance(PVBOXNETFLTINS pThis, void *pvContext)
+{
+    RT_NOREF1(pvContext);
+    LogFlow(("==>vboxNetFltOsInitInstance: instance=%p context=%p\n", pThis, pvContext));
+    AssertReturn(pThis, VERR_INVALID_PARAMETER);
+    Log(("vboxNetFltOsInitInstance: trunk name=%s\n", pThis->szName));
+    NdisAcquireSpinLock(&g_VBoxNetLwfGlobals.Lock);
+    PVBOXNETLWF_MODULE pModuleCtx;
+    RTListForEach(&g_VBoxNetLwfGlobals.listModules, pModuleCtx, VBOXNETLWF_MODULE, node)
+    {
+        DbgPrint("vboxNetFltOsInitInstance: evaluating module, name=%s\n", pModuleCtx->szMiniportName);
+        if (!RTStrICmp(pThis->szName, pModuleCtx->szMiniportName))
+        {
+            NdisReleaseSpinLock(&g_VBoxNetLwfGlobals.Lock);
+            Log(("vboxNetFltOsInitInstance: found matching module, name=%s\n", pThis->szName));
+            pThis->u.s.WinIf.hModuleCtx = pModuleCtx;
+            pModuleCtx->pNetFlt = pThis;
+            vboxNetLwfWinReportCapabilities(pThis, pModuleCtx);
+            vboxNetLwfWinRegisterIpAddrNotifier(pThis);
+            LogFlow(("<==vboxNetFltOsInitInstance: return 0\n"));
+            return VINF_SUCCESS;
+        }
+    }
+    NdisReleaseSpinLock(&g_VBoxNetLwfGlobals.Lock);
+    // Internal network code will try to reconnect periodically, we should not spam in event log
+    //vboxNetLwfLogErrorEvent(IO_ERR_INTERNAL_ERROR, STATUS_SUCCESS, 6);
+    LogFlow(("<==vboxNetFltOsInitInstance: return VERR_INTNET_FLT_IF_NOT_FOUND\n"));
+    return VERR_INTNET_FLT_IF_NOT_FOUND;
+}
+
+int vboxNetFltOsPreInitInstance(PVBOXNETFLTINS pThis)
+{
+    LogFlow(("==>vboxNetFltOsPreInitInstance: instance=%p\n", pThis));
+    pThis->u.s.WinIf.hModuleCtx = 0;
+    pThis->u.s.WinIf.hNotifier  = NULL;
+    LogFlow(("<==vboxNetFltOsPreInitInstance: return 0\n"));
+    return VINF_SUCCESS;
+}
+
+void vboxNetFltPortOsNotifyMacAddress(PVBOXNETFLTINS pThis, void *pvIfData, PCRTMAC pMac)
+{
+    RT_NOREF3(pThis, pvIfData, pMac);
+    LogFlow(("==>vboxNetFltPortOsNotifyMacAddress: instance=%p data=%p mac=%RTmac\n", pThis, pvIfData, pMac));
+    LogFlow(("<==vboxNetFltPortOsNotifyMacAddress\n"));
+}
+
+int vboxNetFltPortOsConnectInterface(PVBOXNETFLTINS pThis, void *pvIf, void **ppvIfData)
+{
+    RT_NOREF3(pThis, pvIf, ppvIfData);
+    LogFlow(("==>vboxNetFltPortOsConnectInterface: instance=%p if=%p data=%p\n", pThis, pvIf, ppvIfData));
+    LogFlow(("<==vboxNetFltPortOsConnectInterface: return 0\n"));
+    /* Nothing to do */
+    return VINF_SUCCESS;
+}
+
+int vboxNetFltPortOsDisconnectInterface(PVBOXNETFLTINS pThis, void *pvIfData)
+{
+    RT_NOREF2(pThis, pvIfData);
+    LogFlow(("==>vboxNetFltPortOsDisconnectInterface: instance=%p data=%p\n", pThis, pvIfData));
+    LogFlow(("<==vboxNetFltPortOsDisconnectInterface: return 0\n"));
+    /* Nothing to do */
+    return VINF_SUCCESS;
+}
+
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetLwf-win.h b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetLwf-win.h
new file mode 100644
index 00000000..7842d11f
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetLwf-win.h
@@ -0,0 +1,45 @@
+/* $Id: VBoxNetLwf-win.h $ */
+/** @file
+ * VBoxNetLwf-win.h - Bridged Networking Driver, Windows-specific code.
+ */
+/*
+ * Copyright (C) 2014-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#ifndef VBOX_INCLUDED_SRC_VBoxNetFlt_win_drv_VBoxNetLwf_win_h
+#define VBOX_INCLUDED_SRC_VBoxNetFlt_win_drv_VBoxNetLwf_win_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#define VBOXNETLWF_VERSION_NDIS_MAJOR        6
+#define VBOXNETLWF_VERSION_NDIS_MINOR        0
+
+#define VBOXNETLWF_NAME_FRIENDLY             L"VirtualBox NDIS Light-Weight Filter"
+#define VBOXNETLWF_NAME_UNIQUE               L"{7af6b074-048d-4444-bfce-1ecc8bc5cb76}"
+#define VBOXNETLWF_NAME_SERVICE              L"VBoxNetLwf"
+
+#define VBOXNETLWF_NAME_LINK                 L"\\DosDevices\\Global\\VBoxNetLwf"
+#define VBOXNETLWF_NAME_DEVICE               L"\\Device\\VBoxNetLwf"
+
+#define VBOXNETLWF_MEM_TAG                   'FLBV'
+#define VBOXNETLWF_REQ_ID                    'fLBV'
+
+#endif /* !VBOX_INCLUDED_SRC_VBoxNetFlt_win_drv_VBoxNetLwf_win_h */
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetLwf.inf b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetLwf.inf
new file mode 100644
index 00000000..0a26ec08
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/drv/VBoxNetLwf.inf
@@ -0,0 +1,116 @@
+; $Id: VBoxNetLwf.inf $
+; @file
+; VBoxNetLwf.inf - VirtualBox Bridged Networking Driver inf file
+;
+
+;
+; Copyright (C) 2014-2020 Oracle Corporation
+;
+; This file is part of VirtualBox Open Source Edition (OSE), as
+; available from http://www.virtualbox.org. This file is free software;
+; you can redistribute it and/or modify it under the terms of the GNU
+; General Public License (GPL) as published by the Free Software
+; Foundation, in version 2 as it comes in the "COPYING" file of the
+; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+;
+; The contents of this file may alternatively be used under the terms
+; of the Common Development and Distribution License Version 1.0
+; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+; VirtualBox OSE distribution, in which case the provisions of the
+; CDDL are applicable instead of those of the GPL.
+;
+; You may elect to license modified versions of this file under the
+; terms and conditions of either the GPL or the CDDL or both.
+;
+
+[Version]
+Signature   = "$Windows NT$"
+;cat  CatalogFile = VBoxNetLwf.cat
+Class       = NetService
+ClassGUID   = {4D36E974-E325-11CE-BFC1-08002BE10318}
+Provider    = %Provider%
+;edit-DriverVer=10/23/2014,1.0.1.0
+
+
+[Manufacturer]
+%Provider% = VBox,NTx86,NTamd64
+
+[ControlFlags]
+
+[VBox]
+%VBoxNetLwf_Desc% = VBoxNetLwf.ndi, oracle_VBoxNetLwf
+
+[VBox.NTx86]
+%VBoxNetLwf_Desc% = VBoxNetLwf.ndi, oracle_VBoxNetLwf
+
+[VBox.NTamd64]
+%VBoxNetLwf_Desc% = VBoxNetLwf.ndi, oracle_VBoxNetLwf
+
+[VBoxNetLwf.ndi]
+AddReg           = VBoxNetLwf.ndi.AddReg, VBoxNetLwf.AddReg
+Characteristics  = 0x40000 ;  NCF_LW_FILTER
+CopyFiles        = VBoxNetLwf.Files.Sys
+NetCfgInstanceId = "{7af6b074-048d-4444-bfce-1ecc8bc5cb76}"
+
+[VBoxNetLwf.ndi.Remove.Services]
+DelService       = VBoxNetLwf,0x200 ; Stop the service before uninstalling
+
+[VBoxNetLwf.ndi.Services]
+AddService = VBoxNetLwf,, VBoxNetLwf.AddService, VBoxNetLwf.AddEventLog
+
+[VBoxNetLwf.AddService]
+DisplayName    = %VBoxNetLwfService_Desc%
+ServiceType    = 1 ;SERVICE_KERNEL_DRIVER
+StartType      = 1 ;SERVICE_SYSTEM_START
+ErrorControl   = 1 ;SERVICE_ERROR_NORMAL
+ServiceBinary  = %12%\VBoxNetLwf.sys
+LoadOrderGroup = NDIS
+AddReg         = VBoxNetLwf.AddService.AddReg
+
+[VBoxNetLwf.AddService.AddReg]
+
+[VBoxNetLwf.AddEventLog]
+AddReg         = VBoxNetLwf.AddEventLog.AddReg
+
+[VBoxNetLwf.AddEventLog.AddReg]
+HKR,,EventMessageFile,0x00020000,"%%SystemRoot%%\System32\IoLogMsg.dll"
+HKR,,TypesSupported,0x00010001,7
+
+
+[SourceDisksNames]
+1=%DiskDescription%,"",,
+
+[SourceDisksFiles]
+VBoxNetLwf.sys=1
+
+[DestinationDirs]
+DefaultDestDir = 12
+VBoxNetLwf.Files.Sys   = 12   ; %windir%\System32\drivers
+
+[VBoxNetLwf.Files.Sys]
+VBoxNetLwf.sys,,,2
+
+
+[VBoxNetLwf.ndi.AddReg]
+HKR, Ndi, HelpText, , %VBoxNetLwf_HELP%
+;HKR, Ndi,            ClsID,              0, {f374d1a0-bf08-4bdc-9cb2-c15ddaeef955}
+;HKR, Ndi,            ComponentDll,        , VBoxNetLwfNobj.dll
+HKR, Ndi,            FilterClass,         , compression
+HKR, Ndi,            FilterType,   0x10001, 0x2
+HKR, Ndi,            FilterRunType,0x10001, 2 ; OPTIONAL, to prevent unbinding of protocol drivers
+HKR, Ndi,            Service,             , VBoxNetLwf
+HKR, Ndi,            CoServices,   0x10000, VBoxNetLwf
+HKR, Ndi\Interfaces, UpperRange,          , noupper
+HKR, Ndi\Interfaces, LowerRange,          , nolower
+HKR, Ndi\Interfaces, FilterMediaTypes,    , ethernet
+
+[VBoxNetLwf.AddReg]
+;HKR, Parameters, Param1, 0, 4
+
+[Strings]
+Provider = "Oracle Corporation"
+DiskDescription = "VirtualBox NDIS6 Bridged Networking Driver"
+VBoxNetLwf_Desc = "VirtualBox NDIS6 Bridged Networking Driver"
+VBoxNetLwf_HELP = "VirtualBox NDIS6 Bridged Networking Driver"
+VBoxNetLwfService_Desc = "VirtualBox NDIS6 Bridged Networking Service"
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/nobj/Makefile.kup b/src/VBox/HostDrivers/VBoxNetFlt/win/nobj/Makefile.kup
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/nobj/Makefile.kup
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/nobj/VBoxNetFltNobj.cpp b/src/VBox/HostDrivers/VBoxNetFlt/win/nobj/VBoxNetFltNobj.cpp
new file mode 100644
index 00000000..f344e881
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/nobj/VBoxNetFltNobj.cpp
@@ -0,0 +1,746 @@
+/* $Id: VBoxNetFltNobj.cpp $ */
+/** @file
+ * VBoxNetFltNobj.cpp - Notify Object for Bridged Networking Driver.
+ * Used to filter Bridged Networking Driver bindings
+ */
+/*
+ * Copyright (C) 2011-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+#include "VBoxNetFltNobj.h"
+#include <iprt/win/ntddndis.h>
+#include <assert.h>
+#include <stdio.h>
+
+#include <VBoxNetFltNobjT_i.c>
+
+#include <Olectl.h>
+
+//# define VBOXNETFLTNOTIFY_DEBUG_BIND
+
+#ifdef DEBUG
+# define NonStandardAssert(a) assert(a)
+# define NonStandardAssertBreakpoint() assert(0)
+#else
+# define NonStandardAssert(a) do{}while (0)
+# define NonStandardAssertBreakpoint() do{}while (0)
+#endif
+
+VBoxNetFltNobj::VBoxNetFltNobj() :
+    mpNetCfg(NULL),
+    mpNetCfgComponent(NULL),
+    mbInstalling(FALSE)
+{
+}
+
+VBoxNetFltNobj::~VBoxNetFltNobj()
+{
+    cleanup();
+}
+
+void VBoxNetFltNobj::cleanup()
+{
+    if (mpNetCfg)
+    {
+        mpNetCfg->Release();
+        mpNetCfg = NULL;
+    }
+
+    if (mpNetCfgComponent)
+    {
+        mpNetCfgComponent->Release();
+        mpNetCfgComponent = NULL;
+    }
+}
+
+void VBoxNetFltNobj::init(IN INetCfgComponent *pNetCfgComponent, IN INetCfg *pNetCfg, IN BOOL bInstalling)
+{
+    cleanup();
+
+    NonStandardAssert(pNetCfg);
+    NonStandardAssert(pNetCfgComponent);
+    if (pNetCfg)
+    {
+        pNetCfg->AddRef();
+        mpNetCfg = pNetCfg;
+    }
+
+    if (pNetCfgComponent)
+    {
+        pNetCfgComponent->AddRef();
+        mpNetCfgComponent = pNetCfgComponent;
+    }
+
+    mbInstalling = bInstalling;
+}
+
+/* INetCfgComponentControl methods */
+STDMETHODIMP VBoxNetFltNobj::Initialize(IN INetCfgComponent *pNetCfgComponent, IN INetCfg *pNetCfg, IN BOOL bInstalling)
+{
+    init(pNetCfgComponent, pNetCfg, bInstalling);
+    return S_OK;
+}
+
+STDMETHODIMP VBoxNetFltNobj::ApplyRegistryChanges()
+{
+    return S_OK;
+}
+
+STDMETHODIMP VBoxNetFltNobj::ApplyPnpChanges(IN INetCfgPnpReconfigCallback *pCallback)
+{
+    RT_NOREF1(pCallback);
+    return S_OK;
+}
+
+STDMETHODIMP VBoxNetFltNobj::CancelChanges()
+{
+    return S_OK;
+}
+
+static HRESULT vboxNetFltWinQueryInstanceKey(IN INetCfgComponent *pComponent, OUT PHKEY phKey)
+{
+    LPWSTR pPnpId;
+    HRESULT hr = pComponent->GetPnpDevNodeId(&pPnpId);
+    if (hr == S_OK)
+    {
+        WCHAR KeyName[MAX_PATH];
+        wcscpy(KeyName, L"SYSTEM\\CurrentControlSet\\Enum\\");
+        wcscat(KeyName,pPnpId);
+
+        LONG winEr = RegOpenKeyExW(HKEY_LOCAL_MACHINE, KeyName,
+          0, /*__reserved DWORD ulOptions*/
+          KEY_READ, /*__in REGSAM samDesired*/
+          phKey);
+
+        if (winEr != ERROR_SUCCESS)
+        {
+            hr = HRESULT_FROM_WIN32(winEr);
+            NonStandardAssertBreakpoint();
+        }
+
+        CoTaskMemFree(pPnpId);
+    }
+    else
+    {
+        NonStandardAssertBreakpoint();
+    }
+
+    return hr;
+}
+
+static HRESULT vboxNetFltWinQueryDriverKey(IN HKEY InstanceKey, OUT PHKEY phKey)
+{
+    DWORD Type = REG_SZ;
+    WCHAR Value[MAX_PATH];
+    DWORD cbValue = sizeof(Value);
+    HRESULT hr = S_OK;
+    LONG winEr = RegQueryValueExW(InstanceKey,
+            L"Driver", /*__in_opt LPCTSTR lpValueName*/
+            0, /*__reserved LPDWORD lpReserved*/
+            &Type, /*__out_opt LPDWORD lpType*/
+            (LPBYTE)Value, /*__out_opt LPBYTE lpData*/
+            &cbValue/*__inout_opt LPDWORD lpcbData*/
+            );
+
+    if (winEr == ERROR_SUCCESS)
+    {
+        WCHAR KeyName[MAX_PATH];
+        wcscpy(KeyName, L"SYSTEM\\CurrentControlSet\\Control\\Class\\");
+        wcscat(KeyName,Value);
+
+        winEr = RegOpenKeyExW(HKEY_LOCAL_MACHINE, KeyName,
+          0, /*__reserved DWORD ulOptions*/
+          KEY_READ, /*__in REGSAM samDesired*/
+          phKey);
+
+        if (winEr != ERROR_SUCCESS)
+        {
+            hr = HRESULT_FROM_WIN32(winEr);
+            NonStandardAssertBreakpoint();
+        }
+    }
+    else
+    {
+        hr = HRESULT_FROM_WIN32(winEr);
+        NonStandardAssertBreakpoint();
+    }
+
+    return hr;
+}
+
+static HRESULT vboxNetFltWinQueryDriverKey(IN INetCfgComponent *pComponent, OUT PHKEY phKey)
+{
+    HKEY InstanceKey;
+    HRESULT hr = vboxNetFltWinQueryInstanceKey(pComponent, &InstanceKey);
+    if (hr == S_OK)
+    {
+        hr = vboxNetFltWinQueryDriverKey(InstanceKey, phKey);
+        if (hr != S_OK)
+        {
+            NonStandardAssertBreakpoint();
+        }
+        RegCloseKey(InstanceKey);
+    }
+    else
+    {
+        NonStandardAssertBreakpoint();
+    }
+
+    return hr;
+}
+
+static HRESULT vboxNetFltWinNotifyCheckNetAdp(IN INetCfgComponent *pComponent, OUT bool * pbShouldBind)
+{
+    HRESULT hr;
+    LPWSTR pDevId;
+    hr = pComponent->GetId(&pDevId);
+    if (hr == S_OK)
+    {
+        if (!_wcsnicmp(pDevId, L"sun_VBoxNetAdp", sizeof(L"sun_VBoxNetAdp")/2))
+        {
+            *pbShouldBind = false;
+        }
+        else
+        {
+            hr = S_FALSE;
+        }
+        CoTaskMemFree(pDevId);
+    }
+    else
+    {
+        NonStandardAssertBreakpoint();
+    }
+
+    return hr;
+}
+
+static HRESULT vboxNetFltWinNotifyCheckMsLoop(IN INetCfgComponent *pComponent, OUT bool * pbShouldBind)
+{
+    HRESULT hr;
+    LPWSTR pDevId;
+    hr = pComponent->GetId(&pDevId);
+    if (hr == S_OK)
+    {
+        if (!_wcsnicmp(pDevId, L"*msloop", sizeof(L"*msloop")/2))
+        {
+            /* we need to detect the medium the adapter is presenting
+             * to do that we could examine in the registry the *msloop params */
+            HKEY DriverKey;
+            hr = vboxNetFltWinQueryDriverKey(pComponent, &DriverKey);
+            if (hr == S_OK)
+            {
+                DWORD Type = REG_SZ;
+                WCHAR Value[64]; /* 2 should be enough actually, paranoid check for extra spaces */
+                DWORD cbValue = sizeof(Value);
+                LONG winEr = RegQueryValueExW(DriverKey,
+                            L"Medium", /*__in_opt LPCTSTR lpValueName*/
+                            0, /*__reserved LPDWORD lpReserved*/
+                            &Type, /*__out_opt LPDWORD lpType*/
+                            (LPBYTE)Value, /*__out_opt LPBYTE lpData*/
+                            &cbValue/*__inout_opt LPDWORD lpcbData*/
+                            );
+                if (winEr == ERROR_SUCCESS)
+                {
+                    PWCHAR endPrt;
+                    ULONG enmMedium = wcstoul(Value,
+                       &endPrt,
+                       0 /* base*/);
+
+                    winEr = errno;
+                    if (winEr == ERROR_SUCCESS)
+                    {
+                        if (enmMedium == 0) /* 0 is Ethernet */
+                        {
+                            *pbShouldBind = true;
+                        }
+                        else
+                        {
+                            *pbShouldBind = false;
+                        }
+                    }
+                    else
+                    {
+                        NonStandardAssertBreakpoint();
+                        *pbShouldBind = true;
+                    }
+                }
+                else
+                {
+                    /** @todo we should check the default medium in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002bE10318}\<driver_id>\Ndi\Params\Medium, REG_SZ "Default" value */
+                    NonStandardAssertBreakpoint();
+                    *pbShouldBind = true;
+                }
+
+                RegCloseKey(DriverKey);
+            }
+            else
+            {
+                NonStandardAssertBreakpoint();
+            }
+        }
+        else
+        {
+            hr = S_FALSE;
+        }
+        CoTaskMemFree(pDevId);
+    }
+    else
+    {
+        NonStandardAssertBreakpoint();
+    }
+
+    return hr;
+}
+
+static HRESULT vboxNetFltWinNotifyCheckLowerRange(IN INetCfgComponent *pComponent, OUT bool * pbShouldBind)
+{
+    HKEY DriverKey;
+    HKEY InterfacesKey;
+    HRESULT hr = vboxNetFltWinQueryDriverKey(pComponent, &DriverKey);
+    if (hr == S_OK)
+    {
+        LONG winEr = RegOpenKeyExW(DriverKey, L"Ndi\\Interfaces",
+                        0, /*__reserved DWORD ulOptions*/
+                        KEY_READ, /*__in REGSAM samDesired*/
+                        &InterfacesKey);
+        if (winEr == ERROR_SUCCESS)
+        {
+            DWORD Type = REG_SZ;
+            WCHAR Value[MAX_PATH];
+            DWORD cbValue = sizeof(Value);
+            winEr = RegQueryValueExW(InterfacesKey,
+                    L"LowerRange", /*__in_opt LPCTSTR lpValueName*/
+                    0, /*__reserved LPDWORD lpReserved*/
+                    &Type, /*__out_opt LPDWORD lpType*/
+                    (LPBYTE)Value, /*__out_opt LPBYTE lpData*/
+                    &cbValue/*__inout_opt LPDWORD lpcbData*/
+                    );
+            if (winEr == ERROR_SUCCESS)
+            {
+                if (wcsstr(Value,L"ethernet") || wcsstr(Value, L"wan"))
+                {
+                    *pbShouldBind = true;
+                }
+                else
+                {
+                    *pbShouldBind = false;
+                }
+            }
+            else
+            {
+                /* do not set err status to it */
+                *pbShouldBind = false;
+                NonStandardAssertBreakpoint();
+            }
+
+            RegCloseKey(InterfacesKey);
+        }
+        else
+        {
+            hr = HRESULT_FROM_WIN32(winEr);
+            NonStandardAssertBreakpoint();
+        }
+
+        RegCloseKey(DriverKey);
+    }
+    else
+    {
+        NonStandardAssertBreakpoint();
+    }
+
+    return hr;
+}
+
+static HRESULT vboxNetFltWinNotifyShouldBind(IN INetCfgComponent *pComponent, OUT bool *pbShouldBind)
+{
+    DWORD fCharacteristics;
+    HRESULT hr;
+
+    do
+    {
+        /* filter out only physical adapters */
+        hr = pComponent->GetCharacteristics(&fCharacteristics);
+        if (hr != S_OK)
+        {
+            NonStandardAssertBreakpoint();
+            break;
+        }
+
+
+        if (fCharacteristics & NCF_HIDDEN)
+        {
+            /* we are not binding to hidden adapters */
+            *pbShouldBind = false;
+            break;
+        }
+
+        hr = vboxNetFltWinNotifyCheckMsLoop(pComponent, pbShouldBind);
+        if (hr == S_OK)
+        {
+            /* this is a loopback adapter,
+             * the pbShouldBind already contains the result */
+            break;
+        }
+        else if (hr != S_FALSE)
+        {
+            /* error occurred */
+            break;
+        }
+
+        hr = vboxNetFltWinNotifyCheckNetAdp(pComponent, pbShouldBind);
+        if (hr == S_OK)
+        {
+            /* this is a VBoxNetAdp adapter,
+             * the pbShouldBind already contains the result */
+            break;
+        }
+        else if (hr != S_FALSE)
+        {
+            /* error occurred */
+            break;
+        }
+
+        /* hr == S_FALSE means this is not a loopback adpater, set it to S_OK */
+        hr = S_OK;
+
+//        if (!(fCharacteristics & NCF_PHYSICAL))
+//        {
+//            /* we are binding to physical adapters only */
+//            *pbShouldBind = false;
+//            break;
+//        }
+
+        hr = vboxNetFltWinNotifyCheckLowerRange(pComponent, pbShouldBind);
+        if (hr == S_OK)
+        {
+            /* the vboxNetFltWinNotifyCheckLowerRange ccucceeded,
+             * the pbShouldBind already contains the result */
+            break;
+        }
+        /* we are here because of the fail, nothing else to do */
+    } while (0);
+
+    return hr;
+}
+
+
+static HRESULT vboxNetFltWinNotifyShouldBind(IN INetCfgBindingInterface *pIf, OUT bool *pbShouldBind)
+{
+    INetCfgComponent * pAdapterComponent;
+    HRESULT hr = pIf->GetLowerComponent(&pAdapterComponent);
+    if (hr == S_OK)
+    {
+        hr = vboxNetFltWinNotifyShouldBind(pAdapterComponent, pbShouldBind);
+
+        pAdapterComponent->Release();
+    }
+    else
+    {
+        NonStandardAssertBreakpoint();
+    }
+
+    return hr;
+}
+
+static HRESULT vboxNetFltWinNotifyShouldBind(IN INetCfgBindingPath *pPath, OUT bool *pbDoBind)
+{
+    IEnumNetCfgBindingInterface *pEnumBindingIf;
+    HRESULT hr = pPath->EnumBindingInterfaces(&pEnumBindingIf);
+    if (hr == S_OK)
+    {
+        hr = pEnumBindingIf->Reset();
+        if (hr == S_OK)
+        {
+            ULONG ulCount;
+            INetCfgBindingInterface *pBindingIf;
+            do
+            {
+                hr = pEnumBindingIf->Next(1, &pBindingIf, &ulCount);
+                if (hr == S_OK)
+                {
+                    hr = vboxNetFltWinNotifyShouldBind(pBindingIf, pbDoBind);
+
+                    pBindingIf->Release();
+
+                    if (hr == S_OK)
+                    {
+                        if (!(*pbDoBind))
+                        {
+                            break;
+                        }
+                    }
+                    else
+                    {
+                        /* break on failure */
+                        break;
+                    }
+                }
+                else if (hr == S_FALSE)
+                {
+                    /* no more elements */
+                    hr = S_OK;
+                    break;
+                }
+                else
+                {
+                    NonStandardAssertBreakpoint();
+                    /* break on falure */
+                    break;
+                }
+            } while (true);
+        }
+        else
+        {
+            NonStandardAssertBreakpoint();
+        }
+
+        pEnumBindingIf->Release();
+    }
+    else
+    {
+        NonStandardAssertBreakpoint();
+    }
+
+    return hr;
+}
+
+static bool vboxNetFltWinNotifyShouldBind(IN INetCfgBindingPath *pPath)
+{
+#ifdef VBOXNETFLTNOTIFY_DEBUG_BIND
+    return VBOXNETFLTNOTIFY_DEBUG_BIND;
+#else
+    bool bShouldBind;
+    HRESULT hr = vboxNetFltWinNotifyShouldBind(pPath, &bShouldBind) ;
+    if (hr != S_OK)
+    {
+        bShouldBind = VBOXNETFLTNOTIFY_ONFAIL_BINDDEFAULT;
+    }
+
+    return bShouldBind;
+#endif
+}
+
+
+/* INetCfgComponentNotifyBinding methods */
+STDMETHODIMP VBoxNetFltNobj::NotifyBindingPath(IN DWORD dwChangeFlag, IN INetCfgBindingPath *pNetCfgBP)
+{
+    if (!(dwChangeFlag & NCN_ENABLE) || (dwChangeFlag & NCN_REMOVE) || vboxNetFltWinNotifyShouldBind(pNetCfgBP))
+        return S_OK;
+    return NETCFG_S_DISABLE_QUERY;
+}
+
+STDMETHODIMP VBoxNetFltNobj::QueryBindingPath(IN DWORD dwChangeFlag, IN INetCfgBindingPath *pNetCfgBP)
+{
+    RT_NOREF1(dwChangeFlag);
+    if (vboxNetFltWinNotifyShouldBind(pNetCfgBP))
+        return S_OK;
+    return NETCFG_S_DISABLE_QUERY;
+}
+
+
+static ATL::CComModule _Module;
+
+BEGIN_OBJECT_MAP(ObjectMap)
+    OBJECT_ENTRY(CLSID_VBoxNetFltNobj, VBoxNetFltNobj)
+END_OBJECT_MAP()
+
+extern "C"
+BOOL WINAPI DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID /*lpReserved*/)
+{
+    if (dwReason == DLL_PROCESS_ATTACH)
+    {
+        _Module.Init(ObjectMap, hInstance);
+        DisableThreadLibraryCalls(hInstance);
+    }
+    else if (dwReason == DLL_PROCESS_DETACH)
+    {
+        _Module.Term();
+    }
+    return TRUE;
+}
+
+STDAPI DllCanUnloadNow()
+{
+    return (_Module.GetLockCount() == 0) ? S_OK : S_FALSE;
+}
+
+STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID* ppv)
+{
+    return _Module.GetClassObject(rclsid, riid, ppv);
+}
+
+/*
+ * ATL::CComModule does not suport server registration/unregistration methods,
+ * so we need to do it manually. Since this is the only place we do registraton
+ * manually, we do it the quick-and-dirty way.
+ */
+
+/* Someday we may want to log errors. */
+class AdHocRegError
+{
+public:
+    AdHocRegError(LSTATUS rc) { RT_NOREF1(rc); };
+};
+
+/* A simple wrapper on Windows registry functions. */
+class AdHocRegKey
+{
+public:
+    AdHocRegKey(HKEY hKey) : m_hKey(hKey) {};
+    AdHocRegKey(LPCWSTR pcwszName, HKEY hParent = HKEY_CLASSES_ROOT);
+    ~AdHocRegKey() { RegCloseKey(m_hKey); };
+
+    AdHocRegKey *create(LPCWSTR pcwszSubkey, LPCWSTR pcwszDefaultValue = NULL);
+    void remove(LPCWSTR pcwszSubkey);
+    void setValue(LPCWSTR pcwszName, LPCWSTR pcwszValue);
+    HKEY getKey(void) { return m_hKey; };
+private:
+    HKEY m_hKey;
+};
+
+AdHocRegKey::AdHocRegKey(LPCWSTR pcwszName, HKEY hParent)
+{
+    LSTATUS rc = RegOpenKeyExW(hParent, pcwszName, 0, KEY_ALL_ACCESS, &m_hKey);
+    if (rc != ERROR_SUCCESS)
+        throw AdHocRegError(rc);
+}
+
+void AdHocRegKey::remove(LPCWSTR pcwszSubkey)
+{
+    LSTATUS rc;
+    WCHAR wszName[256];
+    DWORD dwName;
+
+    /* Remove all subkeys of subkey first */
+    AdHocRegKey *subkey = new AdHocRegKey(pcwszSubkey, m_hKey);
+    for (;;)
+    {
+        /* Always ask for the first subkey, because we remove it before calling RegEnumKeyEx again */
+        dwName = 255;
+        rc = RegEnumKeyExW(subkey->getKey(), 0, wszName, &dwName, NULL, NULL, NULL, NULL);
+        if (rc != ERROR_SUCCESS)
+            break;
+        subkey->remove(wszName);
+    }
+    delete subkey;
+
+    /* Remove the subkey itself */
+    rc = RegDeleteKeyW(m_hKey, pcwszSubkey);
+    if (rc != ERROR_SUCCESS)
+        throw AdHocRegError(rc);
+}
+
+AdHocRegKey *AdHocRegKey::create(LPCWSTR pcwszSubkey, LPCWSTR pcwszDefaultValue)
+{
+    HKEY hSubkey;
+    LSTATUS rc = RegCreateKeyExW(m_hKey, pcwszSubkey,
+                                 0 /*Reserved*/, NULL /*pszClass*/, 0 /*fOptions*/,
+                                 KEY_ALL_ACCESS, NULL /*pSecAttr*/, &hSubkey, NULL /*pdwDisposition*/);
+    if (rc != ERROR_SUCCESS)
+        throw AdHocRegError(rc);
+    AdHocRegKey *pSubkey = new AdHocRegKey(hSubkey);
+    if (pcwszDefaultValue)
+        pSubkey->setValue(NULL, pcwszDefaultValue);
+    return pSubkey;
+}
+
+void AdHocRegKey::setValue(LPCWSTR pcwszName, LPCWSTR pcwszValue)
+{
+    LSTATUS rc = RegSetValueExW(m_hKey, pcwszName, 0, REG_SZ, (const BYTE *)pcwszValue,
+                                (DWORD)((wcslen(pcwszValue) + 1) * sizeof(WCHAR)));
+    if (rc != ERROR_SUCCESS)
+        throw AdHocRegError(rc);
+}
+
+/*
+ * Auxiliary class that facilitates automatic destruction of AdHocRegKey objects
+ * allocated in heap. No reference counting here!
+ */
+class AdHocRegKeyPtr
+{
+public:
+    AdHocRegKeyPtr(AdHocRegKey *pKey) : m_pKey(pKey) {};
+    ~AdHocRegKeyPtr() { delete m_pKey; };
+
+    AdHocRegKey *create(LPCWSTR pcwszSubkey, LPCWSTR pcwszDefaultValue = NULL)
+        { return m_pKey->create(pcwszSubkey, pcwszDefaultValue); };
+    void remove(LPCWSTR pcwszSubkey)
+        { return m_pKey->remove(pcwszSubkey); };
+    void setValue(LPCWSTR pcwszName, LPCWSTR pcwszValue)
+        { return m_pKey->setValue(pcwszName, pcwszValue); };
+private:
+    AdHocRegKey *m_pKey;
+    /* Prevent copying, since we do not support reference counting */
+    AdHocRegKeyPtr(const AdHocRegKeyPtr&);
+    AdHocRegKeyPtr& operator=(const AdHocRegKeyPtr&);
+};
+
+
+STDAPI DllRegisterServer()
+{
+    WCHAR wszModule[MAX_PATH + 1];
+    if (GetModuleFileNameW(GetModuleHandleW(L"VBoxNetFltNobj"), wszModule, MAX_PATH) == 0)
+        return SELFREG_E_CLASS;
+
+    try {
+        AdHocRegKey keyCLSID(L"CLSID");
+        AdHocRegKeyPtr pkeyNobjClass(keyCLSID.create(L"{f374d1a0-bf08-4bdc-9cb2-c15ddaeef955}",
+                                                     L"VirtualBox Bridged Networking Driver Notify Object v1.1"));
+        AdHocRegKeyPtr pkeyNobjSrv(pkeyNobjClass.create(L"InProcServer32", wszModule));
+        pkeyNobjSrv.setValue(L"ThreadingModel", L"Both");
+    }
+    catch (AdHocRegError)
+    {
+        return SELFREG_E_CLASS;
+    }
+
+    try {
+        AdHocRegKey keyTypeLib(L"TypeLib");
+        AdHocRegKeyPtr pkeyNobjLib(keyTypeLib.create(L"{2A0C94D1-40E1-439C-8FE8-24107CAB0840}\\1.1",
+                                                     L"VirtualBox Bridged Networking Driver Notify Object v1.1 Type Library"));
+        AdHocRegKeyPtr pkeyNobjLib0(pkeyNobjLib.create(L"0\\win64", wszModule));
+        AdHocRegKeyPtr pkeyNobjLibFlags(pkeyNobjLib.create(L"FLAGS", L"0"));
+        if (GetSystemDirectoryW(wszModule, MAX_PATH) == 0)
+            return SELFREG_E_TYPELIB;
+        AdHocRegKeyPtr pkeyNobjLibHelpDir(pkeyNobjLib.create(L"HELPDIR", wszModule));
+    }
+    catch (AdHocRegError)
+    {
+        return SELFREG_E_CLASS;
+    }
+
+    return S_OK;
+}
+
+STDAPI DllUnregisterServer()
+{
+    try {
+        AdHocRegKey keyTypeLib(L"TypeLib");
+        keyTypeLib.remove(L"{2A0C94D1-40E1-439C-8FE8-24107CAB0840}");
+    }
+    catch (AdHocRegError) { return SELFREG_E_TYPELIB; }
+
+    try {
+        AdHocRegKey keyCLSID(L"CLSID");
+        keyCLSID.remove(L"{f374d1a0-bf08-4bdc-9cb2-c15ddaeef955}");
+    }
+    catch (AdHocRegError) { return SELFREG_E_CLASS; }
+
+    return S_OK;
+}
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/nobj/VBoxNetFltNobj.def b/src/VBox/HostDrivers/VBoxNetFlt/win/nobj/VBoxNetFltNobj.def
new file mode 100644
index 00000000..25641bb2
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/nobj/VBoxNetFltNobj.def
@@ -0,0 +1,32 @@
+; $Id: VBoxNetFltNobj.def $
+; @file
+; VBoxNetFltNobj.def - Notify Object for Bridged Networking Driver.
+; Library def file
+;
+
+;
+; Copyright (C) 2011-2020 Oracle Corporation
+;
+; This file is part of VirtualBox Open Source Edition (OSE), as
+; available from http://www.virtualbox.org. This file is free software;
+; you can redistribute it and/or modify it under the terms of the GNU
+; General Public License (GPL) as published by the Free Software
+; Foundation, in version 2 as it comes in the "COPYING" file of the
+; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+;
+; The contents of this file may alternatively be used under the terms
+; of the Common Development and Distribution License Version 1.0
+; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+; VirtualBox OSE distribution, in which case the provisions of the
+; CDDL are applicable instead of those of the GPL.
+;
+; You may elect to license modified versions of this file under the
+; terms and conditions of either the GPL or the CDDL or both.
+;
+LIBRARY VBoxNetFltNobj
+EXPORTS
+    DllCanUnloadNow     PRIVATE
+    DllGetClassObject   PRIVATE
+    DllRegisterServer   PRIVATE
+    DllUnregisterServer PRIVATE
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/nobj/VBoxNetFltNobj.h b/src/VBox/HostDrivers/VBoxNetFlt/win/nobj/VBoxNetFltNobj.h
new file mode 100644
index 00000000..b18eb852
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/nobj/VBoxNetFltNobj.h
@@ -0,0 +1,86 @@
+/* $Id: VBoxNetFltNobj.h $ */
+/** @file
+ * VBoxNetFltNobj.h - Notify Object for Bridged Networking Driver.
+ * Used to filter Bridged Networking Driver bindings
+ */
+/*
+ * Copyright (C) 2011-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#ifndef VBOX_INCLUDED_SRC_VBoxNetFlt_win_nobj_VBoxNetFltNobj_h
+#define VBOX_INCLUDED_SRC_VBoxNetFlt_win_nobj_VBoxNetFltNobj_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <iprt/win/windows.h>
+
+#include "VBox/com/defs.h"
+#include "VBoxNetFltNobjT.h"
+#include "VBoxNetFltNobjRc.h"
+
+#define VBOXNETFLTNOTIFY_ONFAIL_BINDDEFAULT false
+
+/*
+ * VirtualBox Bridging driver notify object.
+ * Needed to make our driver bind to "real" host adapters only
+ */
+class ATL_NO_VTABLE VBoxNetFltNobj :
+    public ATL::CComObjectRootEx<ATL::CComMultiThreadModel>,
+    public ATL::CComCoClass<VBoxNetFltNobj, &CLSID_VBoxNetFltNobj>,
+    public INetCfgComponentControl,
+    public INetCfgComponentNotifyBinding
+{
+public:
+    VBoxNetFltNobj();
+    virtual ~VBoxNetFltNobj();
+
+    BEGIN_COM_MAP(VBoxNetFltNobj)
+        COM_INTERFACE_ENTRY(INetCfgComponentControl)
+        COM_INTERFACE_ENTRY(INetCfgComponentNotifyBinding)
+    END_COM_MAP()
+
+    // this is a "just in case" conditional, which is not defined
+#ifdef VBOX_FORCE_REGISTER_SERVER
+    DECLARE_REGISTRY_RESOURCEID(IDR_VBOXNETFLT_NOBJ)
+#endif
+
+    /* INetCfgComponentControl methods */
+    STDMETHOD(Initialize)(IN INetCfgComponent *pNetCfgComponent, IN INetCfg *pNetCfg, IN BOOL bInstalling);
+    STDMETHOD(ApplyRegistryChanges)();
+    STDMETHOD(ApplyPnpChanges)(IN INetCfgPnpReconfigCallback *pCallback);
+    STDMETHOD(CancelChanges)();
+
+    /* INetCfgComponentNotifyBinding methods */
+    STDMETHOD(NotifyBindingPath)(IN DWORD dwChangeFlag, IN INetCfgBindingPath *pNetCfgBP);
+    STDMETHOD(QueryBindingPath)(IN DWORD dwChangeFlag, IN INetCfgBindingPath *pNetCfgBP);
+private:
+
+    void init(IN INetCfgComponent *pNetCfgComponent, IN INetCfg *pNetCfg, IN BOOL bInstalling);
+    void cleanup();
+
+    /* these two used to maintain the component info passed to
+     * INetCfgComponentControl::Initialize */
+    INetCfg *mpNetCfg;
+    INetCfgComponent *mpNetCfgComponent;
+    BOOL mbInstalling;
+};
+
+#endif /* !VBOX_INCLUDED_SRC_VBoxNetFlt_win_nobj_VBoxNetFltNobj_h */
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/nobj/VBoxNetFltNobj.rc b/src/VBox/HostDrivers/VBoxNetFlt/win/nobj/VBoxNetFltNobj.rc
new file mode 100644
index 00000000..54761dd3
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/nobj/VBoxNetFltNobj.rc
@@ -0,0 +1,68 @@
+/* $Id: VBoxNetFltNobj.rc $ */
+/** @file
+ * VBoxNetFltNobj - Resource file containing version info and icon.
+ */
+/*
+ * Copyright (C) 2011-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#include <windows.h>
+#include <VBox/version.h>
+
+#include "VBoxNetFltNobjRc.h"
+
+VS_VERSION_INFO VERSIONINFO
+  FILEVERSION      VBOX_RC_FILE_VERSION
+  PRODUCTVERSION   VBOX_RC_FILE_VERSION
+  FILEFLAGSMASK    VS_FFI_FILEFLAGSMASK
+  FILEFLAGS        VBOX_RC_FILE_FLAGS
+  FILEOS           VBOX_RC_FILE_OS
+  FILETYPE         VBOX_RC_TYPE_DLL
+  FILESUBTYPE      VFT2_UNKNOWN
+BEGIN
+  BLOCK "StringFileInfo"
+  BEGIN
+    BLOCK "040904E4" // Lang=US English, CharSet=Windows Multilingual
+    BEGIN
+      VALUE "FileDescription",  "VirtualBox Bridged Networking Driver Notify Object v1.1\0"
+      VALUE "InternalName",     "VBoxNetFltNobj\0"
+      VALUE "OriginalFilename", "VBoxNetFltNobj.dll\0"
+      VALUE "CompanyName",      VBOX_RC_COMPANY_NAME
+      VALUE "FileVersion",      VBOX_RC_FILE_VERSION_STR
+      VALUE "LegalCopyright",   VBOX_RC_LEGAL_COPYRIGHT
+      VALUE "ProductName",      VBOX_RC_PRODUCT_NAME_STR
+      VALUE "ProductVersion",   VBOX_RC_PRODUCT_VERSION_STR
+      VBOX_RC_MORE_STRINGS
+    END
+  END
+  BLOCK "VarFileInfo"
+  BEGIN
+    VALUE "Translation", 0x409, 1252
+  END
+END
+
+/////////////////////////////////////////////////////////////////////////////
+//
+// REGISTRY
+//
+
+IDR_VBOXNETFLT_NOBJ     REGISTRY   "VBoxNetFltNobj.rgs"
+
+1 TYPELIB "VBoxNetFltNobjT.tlb"
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/nobj/VBoxNetFltNobj.rgs b/src/VBox/HostDrivers/VBoxNetFlt/win/nobj/VBoxNetFltNobj.rgs
new file mode 100644
index 00000000..d6f9bae3
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/nobj/VBoxNetFltNobj.rgs
@@ -0,0 +1,13 @@
+HKCR
+{
+    NoRemove CLSID
+    {
+        ForceRemove {f374d1a0-bf08-4bdc-9cb2-c15ddaeef955} = s 'VirtualBox Bridged Networking Driver Notify Object v1.1'
+        {
+            InProcServer32 = s '%MODULE%'
+            {
+                val ThreadingModel = s 'Both'
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/nobj/VBoxNetFltNobjRc.h b/src/VBox/HostDrivers/VBoxNetFlt/win/nobj/VBoxNetFltNobjRc.h
new file mode 100644
index 00000000..1c3df7c2
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/nobj/VBoxNetFltNobjRc.h
@@ -0,0 +1,36 @@
+/* $Id: VBoxNetFltNobjRc.h $ */
+/** @file
+ * VBoxNetFltNobjRc.h - Notify Object for Bridged Networking Driver.
+ * Resource definitions
+ */
+/*
+ * Copyright (C) 2011-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#ifndef VBOX_INCLUDED_SRC_VBoxNetFlt_win_nobj_VBoxNetFltNobjRc_h
+#define VBOX_INCLUDED_SRC_VBoxNetFlt_win_nobj_VBoxNetFltNobjRc_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+/* registry script rc ID */
+#define IDR_VBOXNETFLT_NOBJ 101
+
+#endif /* !VBOX_INCLUDED_SRC_VBoxNetFlt_win_nobj_VBoxNetFltNobjRc_h */
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/nobj/VBoxNetFltNobjT.idl b/src/VBox/HostDrivers/VBoxNetFlt/win/nobj/VBoxNetFltNobjT.idl
new file mode 100644
index 00000000..e85c5f31
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/nobj/VBoxNetFltNobjT.idl
@@ -0,0 +1,45 @@
+/* $Id: VBoxNetFltNobjT.idl $ */
+/** @file
+ * VBoxNetFltNobjT.idl - Notify Object for Bridged Networking Driver, typelib definition.
+ */
+
+/*
+ * Copyright (C) 2011-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#include <netcfgn.idl>
+
+[
+    uuid(2a0c94d1-40e1-439c-8fe8-24107cab0840),
+    version(1.1),
+    helpstring("VirtualBox Bridged Networking Driver Notify Object v1.1 Type Library")
+]
+library VBoxNetFltNobjLib
+{
+    [
+        uuid(f374d1a0-bf08-4bdc-9cb2-c15ddaeef955),
+        helpstring("VirtualBox Bridged Networking Driver Notify Object Class")
+    ]
+    coclass VBoxNetFltNobj
+    {
+       [restricted] interface INetCfgComponentControl;
+       [restricted] interface INetCfgComponentNotifyBinding;
+    };
+};
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/tools/Makefile.kup b/src/VBox/HostDrivers/VBoxNetFlt/win/tools/Makefile.kup
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/tools/Makefile.kup
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/tools/VBoxNetAdpInstall.cpp b/src/VBox/HostDrivers/VBoxNetFlt/win/tools/VBoxNetAdpInstall.cpp
new file mode 100644
index 00000000..5078c3cf
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/tools/VBoxNetAdpInstall.cpp
@@ -0,0 +1,341 @@
+/* $Id: VBoxNetAdpInstall.cpp $ */
+/** @file
+ * NetAdpInstall - VBoxNetAdp installer command line tool.
+ */
+
+/*
+ * Copyright (C) 2009-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <VBox/VBoxNetCfg-win.h>
+#include <VBox/VBoxDrvCfg-win.h>
+#include <stdio.h>
+#include <devguid.h>
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+#define VBOX_NETADP_APP_NAME L"NetAdpInstall"
+
+#define VBOX_NETADP_HWID L"sun_VBoxNetAdp"
+#ifdef NDIS60
+# define VBOX_NETADP_INF L"VBoxNetAdp6.inf"
+#else
+# define VBOX_NETADP_INF L"VBoxNetAdp.inf"
+#endif
+
+
+static VOID winNetCfgLogger(LPCSTR szString)
+{
+    printf("%s\n", szString);
+}
+
+
+/** Wrapper around GetfullPathNameW that will try an alternative INF location.
+ *
+ * The default location is the current directory.  If not found there, the
+ * alternative location is the executable directory.  If not found there either,
+ * the first alternative is present to the caller.
+ */
+static DWORD MyGetfullPathNameW(LPCWSTR pwszName, size_t cchFull, LPWSTR pwszFull)
+{
+    LPWSTR pwszFilePart;
+    DWORD dwSize = GetFullPathNameW(pwszName, (DWORD)cchFull, pwszFull, &pwszFilePart);
+    if (dwSize <= 0)
+        return dwSize;
+
+    /* if it doesn't exist, see if the file exists in the same directory as the executable. */
+    if (GetFileAttributesW(pwszFull) == INVALID_FILE_ATTRIBUTES)
+    {
+        WCHAR wsz[512];
+        DWORD cch = GetModuleFileNameW(GetModuleHandle(NULL), &wsz[0], sizeof(wsz) / sizeof(wsz[0]));
+        if (cch > 0)
+        {
+            while (cch > 0 && wsz[cch - 1] != '/' && wsz[cch - 1] != '\\' && wsz[cch - 1] != ':')
+                cch--;
+            unsigned i = 0;
+            while (cch < sizeof(wsz) / sizeof(wsz[0]))
+            {
+                wsz[cch] = pwszFilePart[i++];
+                if (!wsz[cch])
+                {
+                    dwSize = GetFullPathNameW(wsz, (DWORD)cchFull, pwszFull, NULL);
+                    if (dwSize > 0 && GetFileAttributesW(pwszFull) != INVALID_FILE_ATTRIBUTES)
+                        return dwSize;
+                    break;
+                }
+                cch++;
+            }
+        }
+    }
+
+    /* fallback */
+    return GetFullPathNameW(pwszName, (DWORD)cchFull, pwszFull, NULL);
+}
+
+
+static int VBoxNetAdpInstall(void)
+{
+    VBoxNetCfgWinSetLogging(winNetCfgLogger);
+
+    HRESULT hr = CoInitialize(NULL);
+    if (SUCCEEDED(hr))
+    {
+        wprintf(L"adding host-only interface..\n");
+
+        WCHAR wszInfFile[MAX_PATH];
+        DWORD cwcInfFile = MyGetfullPathNameW(VBOX_NETADP_INF, sizeof(wszInfFile) / sizeof(wszInfFile[0]), wszInfFile);
+        if (cwcInfFile > 0)
+        {
+            INetCfg *pnc;
+            LPWSTR lpszLockedBy = NULL;
+            hr = VBoxNetCfgWinQueryINetCfg(&pnc, TRUE, VBOX_NETADP_APP_NAME, 10000, &lpszLockedBy);
+            if (hr == S_OK)
+            {
+
+                hr = VBoxNetCfgWinNetAdpInstall(pnc, wszInfFile);
+
+                if (hr == S_OK)
+                {
+                    wprintf(L"installed successfully\n");
+                }
+                else
+                {
+                    wprintf(L"error installing VBoxNetAdp (0x%x)\n", hr);
+                }
+
+                VBoxNetCfgWinReleaseINetCfg(pnc, TRUE);
+            }
+            else
+                wprintf(L"VBoxNetCfgWinQueryINetCfg failed: hr = 0x%x\n", hr);
+            /*
+            hr = VBoxDrvCfgInfInstall(MpInf);
+            if (FAILED(hr))
+                printf("VBoxDrvCfgInfInstall failed %#x\n", hr);
+
+            GUID guid;
+            BSTR name, errMsg;
+
+            hr = VBoxNetCfgWinCreateHostOnlyNetworkInterface (MpInf, true, &guid, &name, &errMsg);
+            if (SUCCEEDED(hr))
+            {
+                ULONG ip, mask;
+                hr = VBoxNetCfgWinGenHostOnlyNetworkNetworkIp(&ip, &mask);
+                if (SUCCEEDED(hr))
+                {
+                    // ip returned by VBoxNetCfgWinGenHostOnlyNetworkNetworkIp is a network ip,
+                    // i.e. 192.168.xxx.0, assign  192.168.xxx.1 for the hostonly adapter
+                    ip = ip | (1 << 24);
+                    hr = VBoxNetCfgWinEnableStaticIpConfig(&guid, ip, mask);
+                    if (SUCCEEDED(hr))
+                    {
+                        printf("installation successful\n");
+                    }
+                    else
+                        printf("VBoxNetCfgWinEnableStaticIpConfig failed: hr = 0x%x\n", hr);
+                }
+                else
+                    printf("VBoxNetCfgWinGenHostOnlyNetworkNetworkIp failed: hr = 0x%x\n", hr);
+            }
+            else
+                printf("VBoxNetCfgWinCreateHostOnlyNetworkInterface failed: hr = 0x%x\n", hr);
+            */
+        }
+        else
+        {
+            DWORD dwErr = GetLastError();
+            wprintf(L"GetFullPathNameW failed: winEr = %d\n", dwErr);
+            hr = HRESULT_FROM_WIN32(dwErr);
+        }
+        CoUninitialize();
+    }
+    else
+        wprintf(L"Error initializing COM (0x%x)\n", hr);
+
+    VBoxNetCfgWinSetLogging(NULL);
+
+    return SUCCEEDED(hr) ? 0 : 1;
+}
+
+static int VBoxNetAdpUninstall(void)
+{
+    VBoxNetCfgWinSetLogging(winNetCfgLogger);
+
+    printf("uninstalling all host-only interfaces..\n");
+
+    HRESULT hr = CoInitialize(NULL);
+    if (SUCCEEDED(hr))
+    {
+        hr = VBoxNetCfgWinRemoveAllNetDevicesOfId(VBOX_NETADP_HWID);
+        if (SUCCEEDED(hr))
+        {
+            hr = VBoxDrvCfgInfUninstallAllSetupDi(&GUID_DEVCLASS_NET, L"Net", VBOX_NETADP_HWID, 0/* could be SUOI_FORCEDELETE */);
+            if (SUCCEEDED(hr))
+            {
+                printf("uninstallation successful\n");
+            }
+            else
+                printf("uninstalled successfully, but failed to remove infs\n");
+        }
+        else
+            printf("uninstall failed, hr = 0x%x\n", hr);
+        CoUninitialize();
+    }
+    else
+        printf("Error initializing COM (0x%x)\n", hr);
+
+    VBoxNetCfgWinSetLogging(NULL);
+
+    return SUCCEEDED(hr) ? 0 : 1;
+}
+
+static int VBoxNetAdpUpdate(void)
+{
+    VBoxNetCfgWinSetLogging(winNetCfgLogger);
+
+    printf("uninstalling all host-only interfaces..\n");
+
+    HRESULT hr = CoInitialize(NULL);
+    if (SUCCEEDED(hr))
+    {
+        BOOL fRebootRequired = FALSE;
+        /*
+         * Before we can update the driver for existing adapters we need to remove
+         * all old driver packages from the driver cache. Otherwise we may end up
+         * with both NDIS5 and NDIS6 versions of VBoxNetAdp in the cache which
+         * will cause all sorts of trouble.
+         */
+        VBoxDrvCfgInfUninstallAllF(L"Net", VBOX_NETADP_HWID, SUOI_FORCEDELETE);
+        hr = VBoxNetCfgWinUpdateHostOnlyNetworkInterface(VBOX_NETADP_INF, &fRebootRequired, VBOX_NETADP_HWID);
+        if (SUCCEEDED(hr))
+        {
+            if (fRebootRequired)
+                printf("!!REBOOT REQUIRED!!\n");
+            printf("updated successfully\n");
+        }
+        else
+            printf("update failed, hr = 0x%x\n", hr);
+
+        CoUninitialize();
+    }
+    else
+        printf("Error initializing COM (0x%x)\n", hr);
+
+    VBoxNetCfgWinSetLogging(NULL);
+
+    return SUCCEEDED(hr) ? 0 : 1;
+}
+
+static int VBoxNetAdpDisable(void)
+{
+    VBoxNetCfgWinSetLogging(winNetCfgLogger);
+
+    printf("disabling all host-only interfaces..\n");
+
+    HRESULT hr = CoInitialize(NULL);
+    if (SUCCEEDED(hr))
+    {
+        hr = VBoxNetCfgWinPropChangeAllNetDevicesOfId(VBOX_NETADP_HWID, VBOXNECTFGWINPROPCHANGE_TYPE_DISABLE);
+        if (SUCCEEDED(hr))
+        {
+            printf("disabling successful\n");
+        }
+        else
+            printf("disable failed, hr = 0x%x\n", hr);
+
+        CoUninitialize();
+    }
+    else
+        printf("Error initializing COM (0x%x)\n", hr);
+
+    VBoxNetCfgWinSetLogging(NULL);
+
+    return SUCCEEDED(hr) ? 0 : 1;
+}
+
+static int VBoxNetAdpEnable(void)
+{
+    VBoxNetCfgWinSetLogging(winNetCfgLogger);
+
+    printf("enabling all host-only interfaces..\n");
+
+    HRESULT hr = CoInitialize(NULL);
+    if (SUCCEEDED(hr))
+    {
+        hr = VBoxNetCfgWinPropChangeAllNetDevicesOfId(VBOX_NETADP_HWID, VBOXNECTFGWINPROPCHANGE_TYPE_ENABLE);
+        if (SUCCEEDED(hr))
+        {
+            printf("enabling successful\n");
+        }
+        else
+            printf("enabling failed, hr = 0x%x\n", hr);
+
+        CoUninitialize();
+    }
+    else
+        printf("Error initializing COM (0x%x)\n", hr);
+
+    VBoxNetCfgWinSetLogging(NULL);
+
+    return SUCCEEDED(hr) ? 0 : 1;
+}
+
+static void printUsage(void)
+{
+    printf("host-only network adapter configuration tool\n"
+            "  Usage: VBoxNetAdpInstall [cmd]\n"
+            "    cmd can be one of the following values:\n"
+            "       i  - install a new host-only interface (default command)\n"
+            "       u  - uninstall all host-only interfaces\n"
+            "       a  - update the host-only driver\n"
+            "       d  - disable all host-only interfaces\n"
+            "       e  - enable all host-only interfaces\n"
+            "       h  - print this message\n");
+}
+
+int __cdecl main(int argc, char **argv)
+{
+    if (argc < 2)
+        return VBoxNetAdpInstall();
+    if (argc > 2)
+    {
+        printUsage();
+        return 1;
+    }
+
+    if (!strcmp(argv[1], "i"))
+        return VBoxNetAdpInstall();
+    if (!strcmp(argv[1], "u"))
+        return VBoxNetAdpUninstall();
+    if (!strcmp(argv[1], "a"))
+        return VBoxNetAdpUpdate();
+    if (!strcmp(argv[1], "d"))
+        return VBoxNetAdpDisable();
+    if (!strcmp(argv[1], "e"))
+        return VBoxNetAdpEnable();
+
+    printUsage();
+    return !strcmp(argv[1], "h");
+}
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/tools/VBoxNetAdpUninstall.cpp b/src/VBox/HostDrivers/VBoxNetFlt/win/tools/VBoxNetAdpUninstall.cpp
new file mode 100644
index 00000000..12c6571d
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/tools/VBoxNetAdpUninstall.cpp
@@ -0,0 +1,89 @@
+/* $Id: VBoxNetAdpUninstall.cpp $ */
+/** @file
+ * NetAdpUninstall - VBoxNetAdp uninstaller command line tool
+ */
+
+/*
+ * Copyright (C) 2009-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#include <VBox/VBoxNetCfg-win.h>
+#include <VBox/VBoxDrvCfg-win.h>
+#include <stdio.h>
+
+#include <devguid.h>
+
+#ifdef NDIS60
+#define VBOX_NETADP_HWID L"sun_VBoxNetAdp6"
+#else /* !NDIS60 */
+#define VBOX_NETADP_HWID L"sun_VBoxNetAdp"
+#endif /* !NDIS60 */
+
+static VOID winNetCfgLogger (LPCSTR szString)
+{
+    printf("%s", szString);
+}
+
+static int VBoxNetAdpUninstall()
+{
+    int r = 1;
+    VBoxNetCfgWinSetLogging(winNetCfgLogger);
+
+    printf("uninstalling all Host-Only interfaces..\n");
+
+    HRESULT hr = CoInitialize(NULL);
+    if (hr == S_OK)
+    {
+        hr = VBoxNetCfgWinRemoveAllNetDevicesOfId(VBOX_NETADP_HWID);
+        if (hr == S_OK)
+        {
+            hr = VBoxDrvCfgInfUninstallAllSetupDi(&GUID_DEVCLASS_NET, L"Net", VBOX_NETADP_HWID, 0/* could be SUOI_FORCEDELETE */);
+            if (hr == S_OK)
+            {
+                printf("uninstalled successfully\n");
+            }
+            else
+            {
+                printf("uninstalled successfully, but failed to remove infs\n");
+            }
+            r = 0;
+        }
+        else
+        {
+            printf("uninstall failed, hr = 0x%x\n", hr);
+        }
+
+        CoUninitialize();
+    }
+    else
+    {
+        wprintf(L"Error initializing COM (0x%x)\n", hr);
+    }
+
+    VBoxNetCfgWinSetLogging(NULL);
+
+    return r;
+}
+
+int __cdecl main(int argc, char **argv)
+{
+    RT_NOREF2(argc, argv);
+    return VBoxNetAdpUninstall();
+}
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/tools/VBoxNetFltInstall.cpp b/src/VBox/HostDrivers/VBoxNetFlt/win/tools/VBoxNetFltInstall.cpp
new file mode 100644
index 00000000..3fd04512
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/tools/VBoxNetFltInstall.cpp
@@ -0,0 +1,183 @@
+/* $Id: VBoxNetFltInstall.cpp $ */
+/** @file
+ * NetFltInstall - VBoxNetFlt installer command line tool
+ */
+
+/*
+ * Copyright (C) 2008-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#include <VBox/VBoxNetCfg-win.h>
+#include <devguid.h>
+#include <stdio.h>
+
+#define NETFLT_ID L"sun_VBoxNetFlt"
+#define VBOX_NETCFG_APP_NAME L"NetFltInstall"
+#define VBOX_NETFLT_PT_INF L".\\VBoxNetFlt.inf"
+#define VBOX_NETFLT_MP_INF L".\\VBoxNetFltM.inf"
+#define VBOX_NETFLT_RETRIES 10
+
+
+static VOID winNetCfgLogger (LPCSTR szString)
+{
+    printf("%s", szString);
+}
+
+/** Wrapper around GetfullPathNameW that will try an alternative INF location.
+ *
+ * The default location is the current directory.  If not found there, the
+ * alternative location is the executable directory.  If not found there either,
+ * the first alternative is present to the caller.
+ */
+static DWORD MyGetfullPathNameW(LPCWSTR pwszName, size_t cchFull, LPWSTR pwszFull)
+{
+    LPWSTR pwszFilePart;
+    DWORD dwSize = GetFullPathNameW(pwszName, (DWORD)cchFull, pwszFull, &pwszFilePart);
+    if (dwSize <= 0)
+        return dwSize;
+
+    /* if it doesn't exist, see if the file exists in the same directory as the executable. */
+    if (GetFileAttributesW(pwszFull) == INVALID_FILE_ATTRIBUTES)
+    {
+        WCHAR wsz[512];
+        DWORD cch = GetModuleFileNameW(GetModuleHandle(NULL), &wsz[0], sizeof(wsz) / sizeof(wsz[0]));
+        if (cch > 0)
+        {
+            while (cch > 0 && wsz[cch - 1] != '/' && wsz[cch - 1] != '\\' && wsz[cch - 1] != ':')
+                cch--;
+            unsigned i = 0;
+            while (cch < sizeof(wsz) / sizeof(wsz[0]))
+            {
+                wsz[cch] = pwszFilePart[i++];
+                if (!wsz[cch])
+                {
+                    dwSize = GetFullPathNameW(wsz, (DWORD)cchFull, pwszFull, NULL);
+                    if (dwSize > 0 && GetFileAttributesW(pwszFull) != INVALID_FILE_ATTRIBUTES)
+                        return dwSize;
+                    break;
+                }
+                cch++;
+            }
+        }
+    }
+
+    /* fallback */
+    return GetFullPathNameW(pwszName, (DWORD)cchFull, pwszFull, NULL);
+}
+
+static int VBoxNetFltInstall()
+{
+    WCHAR PtInf[MAX_PATH];
+    WCHAR MpInf[MAX_PATH];
+    INetCfg *pnc;
+    LPWSTR lpszLockedBy = NULL;
+    int r = 1;
+
+    VBoxNetCfgWinSetLogging(winNetCfgLogger);
+
+    HRESULT hr = CoInitialize(NULL);
+    if (hr == S_OK)
+    {
+        int i = 0;
+        do
+        {
+            hr = VBoxNetCfgWinQueryINetCfg(&pnc, TRUE, VBOX_NETCFG_APP_NAME, 10000, &lpszLockedBy);
+            if (hr == S_OK)
+            {
+                DWORD dwSize;
+                dwSize = MyGetfullPathNameW(VBOX_NETFLT_PT_INF, sizeof(PtInf)/sizeof(PtInf[0]), PtInf);
+                if (dwSize > 0)
+                {
+                    /** @todo add size check for (sizeof(PtInf)/sizeof(PtInf[0])) == dwSize (string length in sizeof(PtInf[0])) */
+
+                    dwSize = MyGetfullPathNameW(VBOX_NETFLT_MP_INF, sizeof(MpInf)/sizeof(MpInf[0]), MpInf);
+                    if (dwSize > 0)
+                    {
+                        /** @todo add size check for (sizeof(MpInf)/sizeof(MpInf[0])) == dwSize (string length in sizeof(MpInf[0])) */
+
+                        LPCWSTR aInfs[] = {PtInf, MpInf};
+                        hr = VBoxNetCfgWinNetFltInstall(pnc, aInfs, 2);
+                        if (hr == S_OK)
+                        {
+                            wprintf(L"installed successfully\n");
+                            r = 0;
+                        }
+                        else
+                        {
+                            wprintf(L"error installing VBoxNetFlt (0x%x)\n", hr);
+                        }
+                    }
+                    else
+                    {
+                        hr = HRESULT_FROM_WIN32(GetLastError());
+                        wprintf(L"error getting full inf path for VBoxNetFltM.inf (0x%x)\n", hr);
+                    }
+                }
+                else
+                {
+                    hr = HRESULT_FROM_WIN32(GetLastError());
+                    wprintf(L"error getting full inf path for VBoxNetFlt.inf (0x%x)\n", hr);
+                }
+
+
+                VBoxNetCfgWinReleaseINetCfg(pnc, TRUE);
+                break;
+            }
+            else if (hr == NETCFG_E_NO_WRITE_LOCK && lpszLockedBy)
+            {
+                if (i < VBOX_NETFLT_RETRIES && !wcscmp(lpszLockedBy, L"6to4svc.dll"))
+                {
+                    wprintf(L"6to4svc.dll is holding the lock, retrying %d out of %d\n", ++i, VBOX_NETFLT_RETRIES);
+                    CoTaskMemFree(lpszLockedBy);
+                }
+                else
+                {
+                    wprintf(L"Error: write lock is owned by another application (%s), close the application and retry installing\n", lpszLockedBy);
+                    r = 1;
+                    CoTaskMemFree(lpszLockedBy);
+                    break;
+                }
+            }
+            else
+            {
+                wprintf(L"Error getting the INetCfg interface (0x%x)\n", hr);
+                r = 1;
+                break;
+            }
+        } while (true);
+
+        CoUninitialize();
+    }
+    else
+    {
+        wprintf(L"Error initializing COM (0x%x)\n", hr);
+        r = 1;
+    }
+
+    VBoxNetCfgWinSetLogging(NULL);
+
+    return r;
+}
+
+int __cdecl main(int argc, char **argv)
+{
+    RT_NOREF2(argc, argv);
+    return VBoxNetFltInstall();
+}
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/tools/VBoxNetFltUninstall.cpp b/src/VBox/HostDrivers/VBoxNetFlt/win/tools/VBoxNetFltUninstall.cpp
new file mode 100644
index 00000000..68c6f54b
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/tools/VBoxNetFltUninstall.cpp
@@ -0,0 +1,113 @@
+/* $Id: VBoxNetFltUninstall.cpp $ */
+/** @file
+ * NetFltUninstall - VBoxNetFlt uninstaller command line tool
+ */
+
+/*
+ * Copyright (C) 2008-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#include <VBox/VBoxNetCfg-win.h>
+#include <stdio.h>
+
+#define NETFLT_ID L"sun_VBoxNetFlt"
+#define VBOX_NETCFG_APP_NAME L"NetFltUninstall"
+#define VBOX_NETFLT_PT_INF L".\\VBoxNetFlt.inf"
+#define VBOX_NETFLT_MP_INF L".\\VBoxNetFltM.inf"
+#define VBOX_NETFLT_RETRIES 10
+
+static VOID winNetCfgLogger (LPCSTR szString)
+{
+    printf("%s", szString);
+}
+
+static int VBoxNetFltUninstall()
+{
+    INetCfg *pnc;
+    LPWSTR lpszLockedBy = NULL;
+    int r;
+
+    VBoxNetCfgWinSetLogging(winNetCfgLogger);
+
+    HRESULT hr = CoInitialize(NULL);
+    if (hr == S_OK)
+    {
+        int i = 0;
+        do
+        {
+            hr = VBoxNetCfgWinQueryINetCfg(&pnc, TRUE, VBOX_NETCFG_APP_NAME, 10000, &lpszLockedBy);
+            if (hr == S_OK)
+            {
+                hr = VBoxNetCfgWinNetFltUninstall(pnc);
+                if (hr != S_OK && hr != S_FALSE)
+                {
+                    wprintf(L"error uninstalling VBoxNetFlt (0x%x)\n", hr);
+                    r = 1;
+                }
+                else
+                {
+                    wprintf(L"uninstalled successfully\n");
+                    r = 0;
+                }
+
+                VBoxNetCfgWinReleaseINetCfg(pnc, TRUE);
+                break;
+            }
+            else if (hr == NETCFG_E_NO_WRITE_LOCK && lpszLockedBy)
+            {
+                if (i < VBOX_NETFLT_RETRIES && !wcscmp(lpszLockedBy, L"6to4svc.dll"))
+                {
+                    wprintf(L"6to4svc.dll is holding the lock, retrying %d out of %d\n", ++i, VBOX_NETFLT_RETRIES);
+                    CoTaskMemFree(lpszLockedBy);
+                }
+                else
+                {
+                    wprintf(L"Error: write lock is owned by another application (%s), close the application and retry uninstalling\n", lpszLockedBy);
+                    r = 1;
+                    CoTaskMemFree(lpszLockedBy);
+                    break;
+                }
+            }
+            else
+            {
+                wprintf(L"Error getting the INetCfg interface (0x%x)\n", hr);
+                r = 1;
+                break;
+            }
+        } while (true);
+
+        CoUninitialize();
+    }
+    else
+    {
+        wprintf(L"Error initializing COM (0x%x)\n", hr);
+        r = 1;
+    }
+
+    VBoxNetCfgWinSetLogging(NULL);
+
+    return r;
+}
+
+int __cdecl main(int argc, char **argv)
+{
+    RT_NOREF2(argc, argv);
+    return VBoxNetFltUninstall();
+}
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/tools/VBoxNetLwfInstall.cpp b/src/VBox/HostDrivers/VBoxNetFlt/win/tools/VBoxNetLwfInstall.cpp
new file mode 100644
index 00000000..4f8ff239
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/tools/VBoxNetLwfInstall.cpp
@@ -0,0 +1,167 @@
+/* $Id: VBoxNetLwfInstall.cpp $ */
+/** @file
+ * NetLwfInstall - VBoxNetLwf installer command line tool
+ */
+
+/*
+ * Copyright (C) 2014-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#include <VBox/VBoxNetCfg-win.h>
+#include <devguid.h>
+#include <stdio.h>
+
+#define VBOX_NETCFG_APP_NAME L"NetLwfInstall"
+#define VBOX_NETLWF_INF L".\\VBoxNetLwf.inf"
+#define VBOX_NETLWF_RETRIES 10
+
+
+static VOID winNetCfgLogger (LPCSTR szString)
+{
+    printf("%s", szString);
+}
+
+/** Wrapper around GetfullPathNameW that will try an alternative INF location.
+ *
+ * The default location is the current directory.  If not found there, the
+ * alternative location is the executable directory.  If not found there either,
+ * the first alternative is present to the caller.
+ */
+static DWORD MyGetfullPathNameW(LPCWSTR pwszName, size_t cchFull, LPWSTR pwszFull)
+{
+    LPWSTR pwszFilePart;
+    DWORD dwSize = GetFullPathNameW(pwszName, (DWORD)cchFull, pwszFull, &pwszFilePart);
+    if (dwSize <= 0)
+        return dwSize;
+
+    /* if it doesn't exist, see if the file exists in the same directory as the executable. */
+    if (GetFileAttributesW(pwszFull) == INVALID_FILE_ATTRIBUTES)
+    {
+        WCHAR wsz[512];
+        DWORD cch = GetModuleFileNameW(GetModuleHandle(NULL), &wsz[0], sizeof(wsz) / sizeof(wsz[0]));
+        if (cch > 0)
+        {
+            while (cch > 0 && wsz[cch - 1] != '/' && wsz[cch - 1] != '\\' && wsz[cch - 1] != ':')
+                cch--;
+            unsigned i = 0;
+            while (cch < sizeof(wsz) / sizeof(wsz[0]))
+            {
+                wsz[cch] = pwszFilePart[i++];
+                if (!wsz[cch])
+                {
+                    dwSize = GetFullPathNameW(wsz, (DWORD)cchFull, pwszFull, NULL);
+                    if (dwSize > 0 && GetFileAttributesW(pwszFull) != INVALID_FILE_ATTRIBUTES)
+                        return dwSize;
+                    break;
+                }
+                cch++;
+            }
+        }
+    }
+
+    /* fallback */
+    return GetFullPathNameW(pwszName, (DWORD)cchFull, pwszFull, NULL);
+}
+
+static int VBoxNetLwfInstall()
+{
+    WCHAR Inf[MAX_PATH];
+    INetCfg *pnc;
+    LPWSTR lpszLockedBy = NULL;
+    int r = 1;
+
+    VBoxNetCfgWinSetLogging(winNetCfgLogger);
+
+    HRESULT hr = CoInitialize(NULL);
+    if (hr == S_OK)
+    {
+        int i = 0;
+        do
+        {
+            hr = VBoxNetCfgWinQueryINetCfg(&pnc, TRUE, VBOX_NETCFG_APP_NAME, 10000, &lpszLockedBy);
+            if (hr == S_OK)
+            {
+                DWORD dwSize;
+                dwSize = MyGetfullPathNameW(VBOX_NETLWF_INF, sizeof(Inf)/sizeof(Inf[0]), Inf);
+                if (dwSize > 0)
+                {
+                    /** @todo add size check for (sizeof(Inf)/sizeof(Inf[0])) == dwSize (string length in sizeof(Inf[0])) */
+                    hr = VBoxNetCfgWinNetLwfInstall(pnc, Inf);
+                    if (hr == S_OK)
+                    {
+                        wprintf(L"installed successfully\n");
+                        r = 0;
+                    }
+                    else
+                    {
+                        wprintf(L"error installing VBoxNetLwf (0x%x)\n", hr);
+                    }
+                }
+                else
+                {
+                    hr = HRESULT_FROM_WIN32(GetLastError());
+                    wprintf(L"error getting full inf path for VBoxNetLwf.inf (0x%x)\n", hr);
+                }
+
+
+                VBoxNetCfgWinReleaseINetCfg(pnc, TRUE);
+                break;
+            }
+            else if (hr == NETCFG_E_NO_WRITE_LOCK && lpszLockedBy)
+            {
+                if (i < VBOX_NETLWF_RETRIES && !wcscmp(lpszLockedBy, L"6to4svc.dll"))
+                {
+                    wprintf(L"6to4svc.dll is holding the lock, retrying %d out of %d\n", ++i, VBOX_NETLWF_RETRIES);
+                    CoTaskMemFree(lpszLockedBy);
+                }
+                else
+                {
+                    wprintf(L"Error: write lock is owned by another application (%s), close the application and retry installing\n", lpszLockedBy);
+                    r = 1;
+                    CoTaskMemFree(lpszLockedBy);
+                    break;
+                }
+            }
+            else
+            {
+                wprintf(L"Error getting the INetCfg interface (0x%x)\n", hr);
+                r = 1;
+                break;
+            }
+        } while (true);
+
+        CoUninitialize();
+    }
+    else
+    {
+        wprintf(L"Error initializing COM (0x%x)\n", hr);
+        r = 1;
+    }
+
+    VBoxNetCfgWinSetLogging(NULL);
+
+    return r;
+}
+
+int __cdecl main(int argc, char **argv)
+{
+    RT_NOREF2(argc, argv);
+    return VBoxNetLwfInstall();
+}
diff --git a/src/VBox/HostDrivers/VBoxNetFlt/win/tools/VBoxNetLwfUninstall.cpp b/src/VBox/HostDrivers/VBoxNetFlt/win/tools/VBoxNetLwfUninstall.cpp
new file mode 100644
index 00000000..390b792d
--- /dev/null
+++ b/src/VBox/HostDrivers/VBoxNetFlt/win/tools/VBoxNetLwfUninstall.cpp
@@ -0,0 +1,110 @@
+/* $Id: VBoxNetLwfUninstall.cpp $ */
+/** @file
+ * NetLwfUninstall - VBoxNetLwf uninstaller command line tool
+ */
+
+/*
+ * Copyright (C) 2014-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#include <VBox/VBoxNetCfg-win.h>
+#include <stdio.h>
+
+#define VBOX_NETCFG_APP_NAME L"NetLwfUninstall"
+#define VBOX_NETLWF_RETRIES 10
+
+static VOID winNetCfgLogger (LPCSTR szString)
+{
+    printf("%s", szString);
+}
+
+static int VBoxNetLwfUninstall()
+{
+    INetCfg *pnc;
+    LPWSTR lpszLockedBy = NULL;
+    int r;
+
+    VBoxNetCfgWinSetLogging(winNetCfgLogger);
+
+    HRESULT hr = CoInitialize(NULL);
+    if (hr == S_OK)
+    {
+        int i = 0;
+        do
+        {
+            hr = VBoxNetCfgWinQueryINetCfg(&pnc, TRUE, VBOX_NETCFG_APP_NAME, 10000, &lpszLockedBy);
+            if (hr == S_OK)
+            {
+                hr = VBoxNetCfgWinNetLwfUninstall(pnc);
+                if (hr != S_OK)
+                {
+                    wprintf(L"error uninstalling VBoxNetLwf (0x%x)\n", hr);
+                    r = 1;
+                }
+                else
+                {
+                    wprintf(L"uninstalled successfully\n");
+                    r = 0;
+                }
+
+                VBoxNetCfgWinReleaseINetCfg(pnc, TRUE);
+                break;
+            }
+            else if (hr == NETCFG_E_NO_WRITE_LOCK && lpszLockedBy)
+            {
+                if (i < VBOX_NETLWF_RETRIES && !wcscmp(lpszLockedBy, L"6to4svc.dll"))
+                {
+                    wprintf(L"6to4svc.dll is holding the lock, retrying %d out of %d\n", ++i, VBOX_NETLWF_RETRIES);
+                    CoTaskMemFree(lpszLockedBy);
+                }
+                else
+                {
+                    wprintf(L"Error: write lock is owned by another application (%s), close the application and retry uninstalling\n", lpszLockedBy);
+                    r = 1;
+                    CoTaskMemFree(lpszLockedBy);
+                    break;
+                }
+            }
+            else
+            {
+                wprintf(L"Error getting the INetCfg interface (0x%x)\n", hr);
+                r = 1;
+                break;
+            }
+        } while (true);
+
+        CoUninitialize();
+    }
+    else
+    {
+        wprintf(L"Error initializing COM (0x%x)\n", hr);
+        r = 1;
+    }
+
+    VBoxNetCfgWinSetLogging(NULL);
+
+    return r;
+}
+
+int __cdecl main(int argc, char **argv)
+{
+    RT_NOREF2(argc, argv);
+    return VBoxNetLwfUninstall();
+}