diff options
Diffstat (limited to 'src/VBox/NetworkServices/NAT')
34 files changed, 16767 insertions, 0 deletions
diff --git a/src/VBox/NetworkServices/NAT/Makefile.kmk b/src/VBox/NetworkServices/NAT/Makefile.kmk new file mode 100644 index 00000000..6e9a1917 --- /dev/null +++ b/src/VBox/NetworkServices/NAT/Makefile.kmk @@ -0,0 +1,162 @@ +# $Id: Makefile.kmk $ +## @file +# Sub-makefile for NAT Networking +# + +# +# Copyright (C) 2006-2023 Oracle and/or its affiliates. +# +# This file is part of VirtualBox base platform packages, as +# available from https://www.virtualbox.org. +# +# This program is free software; you can redistribute it and/or +# modify it under the terms of the GNU General Public License +# as published by the Free Software Foundation, in version 3 of the +# License. +# +# This program is distributed in the hope that it will be useful, but +# WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, see <https://www.gnu.org/licenses>. +# +# SPDX-License-Identifier: GPL-3.0-only +# + +SUB_DEPTH = ../../../.. +include $(KBUILD_PATH)/subheader.kmk +ifdef VBOX_WITH_LWIP_NAT # entire file + + ifndef LWIP_SOURCES + include $(PATH_SUB_CURRENT)/../../Devices/Network/lwip-new/Config.kmk + endif + + # + # Globals + # + VBOX_PATH_NAT_SRC := $(PATH_SUB_CURRENT) + + + # + # Hardened stub exe for VBoxNetNAT. + # + ifdef VBOX_WITH_HARDENING + PROGRAMS += VBoxNetNATHardened + VBoxNetNATHardened_TEMPLATE = VBoxR3HardenedExe + VBoxNetNATHardened_NAME = VBoxNetNAT + ifdef VBOX_WITH_AUTOMATIC_DEFS_QUOTING + VBoxNetNATHardened_DEFS = SERVICE_NAME="VBoxNetNAT" + else + VBoxNetNATHardened_DEFS = SERVICE_NAME=\"VBoxNetNAT\" + endif + VBoxNetNATHardened_SOURCES = VBoxNetNATHardened.cpp + VBoxNetNATHardened_LDFLAGS.win = /SUBSYSTEM:windows + $(call VBOX_SET_VER_INFO_EXE,VBoxNetNATHardened,VirtualBox NAT Engine,$(VBOX_WINDOWS_ICON_FILE)) # Version info / description. + endif + + + # + # VBoxNetNAT. + # + ifdef VBOX_WITH_HARDENING + DLLS += VBoxNetNAT + else + PROGRAMS += VBoxNetNAT + endif + VBoxNetNAT_TEMPLATE := $(if-expr defined(VBOX_WITH_HARDENING),VBoxMainDll,VBoxMainClientExe) + VBoxNetNAT_NAME := VBoxNetNAT + VBoxNetNAT_DEFS = \ + IPv6 \ + $(if $(VBOX_WITH_INTNET_SERVICE_IN_R3),VBOX_WITH_INTNET_SERVICE_IN_R3,) + # VBoxNetNAT_DEFS.linux = WITH_VALGRIND # instrument lwip memp.c + VBoxNetNAT_DEFS.win = VBOX_COM_OUTOFPROC_MODULE _WIN32_WINNT=0x501 # Windows XP + # Convince Solaris headers to expose socket stuff we need. + # + # Setting _XOPEN_SOURCE to either 500 or 600 would always work, but + # <sys/feature_tests.h> insists that 600 requires C99 and so it + # explodes for older g++. It also insists that 500 is NOT to be used + # with C99. + # + # Newer g++ in C++11 mode (formerly known as C++0x) needs 600, so it + # employs sleight of hand to pretend it's C99 to keep feature test + # happy. + # + # Compile the C code with settings that match g++. This probably + # should be centralized so that whole codebase uses consistent + # settings. + ifeq ($(KBUILD_TARGET),solaris) + ifneq ($(VBOX_GCC_VERSION_CXX),) + if $(VBOX_GCC_VERSION_CXX) >= 40600 + # we compile C++ code with -std=c++0x / -std=c++11 + VBoxNetNAT_CFLAGS.solaris += -std=c99 + VBoxNetNAT_DEFS.solaris += _XOPEN_SOURCE=600 + else + VBoxNetNAT_DEFS.solaris += _XOPEN_SOURCE=500 + endif + endif + VBoxNetNAT_DEFS.solaris += __EXTENSIONS__=1 + endif + + # (current dir is for for lwipopts.h) + VBoxNetNAT_INCS += . $(addprefix ../../Devices/Network/lwip-new/,$(LWIP_INCS)) + + VBoxNetNAT_SOURCES = \ + VBoxNetLwipNAT.cpp \ + ../NetLib/IntNetIf.cpp \ + ../NetLib/VBoxNetPortForwardString.cpp \ + $(addprefix ../../Devices/Network/lwip-new/,$(LWIP_SOURCES)) \ + proxy_pollmgr.c \ + proxy_rtadvd.c \ + proxy.c \ + pxremap.c \ + pxtcp.c \ + pxudp.c \ + pxdns.c \ + fwtcp.c \ + fwudp.c \ + portfwd.c \ + proxy_dhcp6ds.c \ + proxy_tftpd.c + + ifeq ($(KBUILD_TARGET),win) + VBoxNetNAT_SOURCES += pxping_win.c # unprivileged Icmp API + else + VBoxNetNAT_SOURCES += pxping.c # raw sockets + VBoxNetNAT_CFLAGS.linux += -Wno-address-of-packed-member # Needed for GCC 9. + endif + + VBoxNetNAT_SOURCES.darwin += rtmon_bsd.c + VBoxNetNAT_SOURCES.freebsd += rtmon_bsd.c + VBoxNetNAT_SOURCES.linux += rtmon_linux.c + VBoxNetNAT_SOURCES.solaris += rtmon_bsd.c + VBoxNetNAT_SOURCES.win += \ + rtmon_win.c \ + RTWinPoll.cpp \ + RTWinSocketPair.cpp + + VBoxNetNAT_LIBS = \ + $(LIB_RUNTIME) + VBoxNetNAT_LIBS.solaris += socket nsl + + VBoxNetNAT_LDFLAGS.win = /SUBSYSTEM:windows + + # ifeq ($(VBOX_WITH_HARDENING),) + # ifn1of ($(KBUILD_TARGET), darwin win) + # # helper for debugging unprivileged + # VBoxNetNAT_DEFS += VBOX_RAWSOCK_DEBUG_HELPER + # VBoxNetNAT_SOURCES += getrawsock.c + # endif + # endif + + + ifdef VBOX_WITH_HARDENING + $(call VBOX_SET_VER_INFO_DLL,VBoxNetNAT,VirtualBox NAT Engine (dll),$(VBOX_WINDOWS_ICON_FILE)) # Version info / description. + else + $(call VBOX_SET_VER_INFO_EXE,VBoxNetNAT,VirtualBox NAT Engine,$(VBOX_WINDOWS_ICON_FILE)) # Version info / description. + endif + +endif # VBOX_WITH_LWIP_NAT +include $(FILE_KBUILD_SUB_FOOTER) + diff --git a/src/VBox/NetworkServices/NAT/RTWinPoll.cpp b/src/VBox/NetworkServices/NAT/RTWinPoll.cpp new file mode 100644 index 00000000..c1cf2707 --- /dev/null +++ b/src/VBox/NetworkServices/NAT/RTWinPoll.cpp @@ -0,0 +1,164 @@ +/* $Id: RTWinPoll.cpp $ */ +/** @file + * NAT Network - poll(2) implementation for winsock. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ +#define LOG_GROUP LOG_GROUP_NAT_SERVICE + +#include <iprt/asm.h> +#include <iprt/assert.h> +#include <iprt/cdefs.h> +#include <iprt/errcore.h> +#include <iprt/string.h> + +#include <iprt/errcore.h> +#include <VBox/log.h> + +#include <iprt/win/winsock2.h> +#include <iprt/win/windows.h> +#include "winpoll.h" + +static HANDLE g_hNetworkEvent; + +int +RTWinPoll(struct pollfd *pFds, unsigned int nfds, int timeout, int *pNready) +{ + AssertPtrReturn(pFds, VERR_INVALID_PARAMETER); + + if (g_hNetworkEvent == WSA_INVALID_EVENT) + { + g_hNetworkEvent = WSACreateEvent(); + AssertReturn(g_hNetworkEvent != WSA_INVALID_EVENT, VERR_INTERNAL_ERROR); + } + + for (unsigned int i = 0; i < nfds; ++i) + { + long eventMask = 0; + short pollEvents = pFds[i].events; + + /* clean revents */ + pFds[i].revents = 0; + + /* ignore invalid sockets */ + if (pFds[i].fd == INVALID_SOCKET) + continue; + + /* + * POLLIN Data other than high priority data may be read without blocking. + * This is equivalent to ( POLLRDNORM | POLLRDBAND ). + * POLLRDBAND Priority data may be read without blocking. + * POLLRDNORM Normal data may be read without blocking. + */ + if (pollEvents & POLLIN) + eventMask |= FD_READ | FD_ACCEPT; + + /* + * POLLOUT Normal data may be written without blocking. This is equivalent + * to POLLWRNORM. + * POLLWRNORM Normal data may be written without blocking. + */ + if (pollEvents & POLLOUT) + eventMask |= FD_WRITE | FD_CONNECT; + + /* + * This is "moral" equivalent to POLLHUP. + */ + eventMask |= FD_CLOSE; + WSAEventSelect(pFds[i].fd, g_hNetworkEvent, eventMask); + } + + DWORD index = WSAWaitForMultipleEvents(1, + &g_hNetworkEvent, + FALSE, + timeout == RT_INDEFINITE_WAIT ? WSA_INFINITE : timeout, + FALSE); + if (index != WSA_WAIT_EVENT_0) + { + if (index == WSA_WAIT_TIMEOUT) + return VERR_TIMEOUT; + } + + int nready = 0; + for (unsigned int i = 0; i < nfds; ++i) + { + short revents = 0; + WSANETWORKEVENTS NetworkEvents; + int err; + + if (pFds[i].fd == INVALID_SOCKET) + continue; + + RT_ZERO(NetworkEvents); + + err = WSAEnumNetworkEvents(pFds[i].fd, + g_hNetworkEvent, + &NetworkEvents); + + if (err == SOCKET_ERROR) + { + if (WSAGetLastError() == WSAENOTSOCK) + { + pFds[i].revents = POLLNVAL; + ++nready; + } + continue; + } + + /* deassociate socket with event */ + WSAEventSelect(pFds[i].fd, g_hNetworkEvent, 0); + +#define WSA_TO_POLL(_wsaev, _pollev) \ + do { \ + if (NetworkEvents.lNetworkEvents & (_wsaev)) { \ + revents |= (_pollev); \ + if (NetworkEvents.iErrorCode[_wsaev##_BIT] != 0) { \ + Log2(("sock %d: %s: %R[sockerr]\n", \ + pFds[i].fd, #_wsaev, \ + NetworkEvents.iErrorCode[_wsaev##_BIT])); \ + revents |= POLLERR; \ + } \ + } \ + } while (0) + + WSA_TO_POLL(FD_READ, POLLIN); + WSA_TO_POLL(FD_ACCEPT, POLLIN); + WSA_TO_POLL(FD_WRITE, POLLOUT); + WSA_TO_POLL(FD_CONNECT, POLLOUT); + WSA_TO_POLL(FD_CLOSE, POLLHUP | (pFds[i].events & POLLIN)); + + Assert((revents & ~(pFds[i].events | POLLHUP | POLLERR)) == 0); + + if (revents != 0) + { + pFds[i].revents = revents; + ++nready; + } + } + WSAResetEvent(g_hNetworkEvent); + + if (pNready) + *pNready = nready; + + return VINF_SUCCESS; +} diff --git a/src/VBox/NetworkServices/NAT/RTWinSocketPair.cpp b/src/VBox/NetworkServices/NAT/RTWinSocketPair.cpp new file mode 100644 index 00000000..5b405bee --- /dev/null +++ b/src/VBox/NetworkServices/NAT/RTWinSocketPair.cpp @@ -0,0 +1,235 @@ +/* $Id: RTWinSocketPair.cpp $ */ +/** @file + * NAT Network - socketpair(2) emulation for winsock. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#include <iprt/asm.h> +#include <iprt/assert.h> +#include <iprt/cdefs.h> +#include <iprt/errcore.h> + +#include <iprt/errcore.h> + +#include <iprt/win/winsock2.h> +#include <iprt/win/windows.h> + +#include <stdio.h> +#include <iprt/log.h> + +extern "C" int RTWinSocketPair(int domain, int type, int protocol, SOCKET socket_vector[2]) +{ + LogFlowFunc(("ENTER: domain:%d, type:%d, protocol:%d, socket_vector:%p\n", + domain, type, protocol, socket_vector)); + switch (domain) + { + case AF_INET: + break; + case AF_INET6: /* I dobt we really need it. */ + default: + AssertMsgFailedReturn(("Unsuported domain:%d\n", domain), + VERR_INVALID_PARAMETER); + } + + switch(type) + { + case SOCK_STREAM: + case SOCK_DGRAM: + break; + default: + AssertMsgFailedReturn(("Unsuported type:%d\n", type), + VERR_INVALID_PARAMETER); + } + + AssertPtrReturn(socket_vector, VERR_INVALID_PARAMETER); + if (!socket_vector) + return VERR_INVALID_PARAMETER; + + socket_vector[0] = socket_vector[1] = INVALID_SOCKET; + + SOCKET listener = INVALID_SOCKET; + + union { + struct sockaddr_in in_addr; + struct sockaddr addr; + } sa[2]; + + int cb = sizeof(sa); + memset(&sa, 0, cb); + + sa[0].in_addr.sin_family = domain; + sa[0].in_addr.sin_addr.s_addr = RT_H2N_U32(INADDR_LOOPBACK); + sa[0].in_addr.sin_port = 0; + cb = sizeof(sa[0]); + + if (type == SOCK_STREAM) + { + listener = WSASocket(domain, type, protocol, 0, NULL, 0); + + if (listener == INVALID_SOCKET) + { + return VERR_INTERNAL_ERROR; + } + + int reuse = 1; + cb = sizeof(int); + int rc = setsockopt(listener, SOL_SOCKET, SO_REUSEADDR, (char *)&reuse, cb); + + if (rc) + { + goto close_socket; + } + + cb = sizeof(sa[0]); + rc = bind(listener, &sa[0].addr, cb); + if(rc) + { + goto close_socket; + } + + memset(&sa[0], 0, cb); + rc = getsockname(listener, &sa[0].addr, &cb); + if (rc) + { + goto close_socket; + } + + rc = listen(listener, 1); + if (rc) + { + goto close_socket; + } + + socket_vector[0] = WSASocket(domain, type, protocol, 0, NULL, 0); + if (socket_vector[0] == INVALID_SOCKET) + { + goto close_socket; + } + + rc = connect(socket_vector[0], &sa[0].addr, cb); + if (rc) + goto close_socket; + + + socket_vector[1] = accept(listener, NULL, NULL); + if (socket_vector[1] == INVALID_SOCKET) + { + goto close_socket; + } + + closesocket(listener); + } + else + { + socket_vector[0] = WSASocket(domain, type, protocol, 0, NULL, 0); + + cb = sizeof(sa[0]); + int rc = bind(socket_vector[0], &sa[0].addr, cb); + Assert(rc != SOCKET_ERROR); + if (rc == SOCKET_ERROR) + { + goto close_socket; + } + + sa[1].in_addr.sin_family = domain; + sa[1].in_addr.sin_addr.s_addr = RT_H2N_U32(INADDR_LOOPBACK); + sa[1].in_addr.sin_port = 0; + + socket_vector[1] = WSASocket(domain, type, protocol, 0, NULL, 0); + rc = bind(socket_vector[1], &sa[1].addr, cb); + Assert(rc != SOCKET_ERROR); + if (rc == SOCKET_ERROR) + { + goto close_socket; + } + + { + u_long mode = 0; + rc = ioctlsocket(socket_vector[0], FIONBIO, &mode); + AssertMsgReturn(rc != SOCKET_ERROR, + ("ioctl error: %d\n", WSAGetLastError()), + VERR_INTERNAL_ERROR); + + rc = ioctlsocket(socket_vector[1], FIONBIO, &mode); + AssertMsgReturn(rc != SOCKET_ERROR, + ("ioctl error: %d\n", WSAGetLastError()), + VERR_INTERNAL_ERROR); + } + + memset(&sa, 0, 2 * cb); + rc = getsockname(socket_vector[0], &sa[0].addr, &cb); + Assert(rc != SOCKET_ERROR); + if (rc == SOCKET_ERROR) + { + goto close_socket; + } + + rc = getsockname(socket_vector[1], &sa[1].addr, &cb); + Assert(rc != SOCKET_ERROR); + if (rc == SOCKET_ERROR) + { + goto close_socket; + } + + rc = connect(socket_vector[0], &sa[1].addr, cb); + Assert(rc != SOCKET_ERROR); + if (rc == SOCKET_ERROR) + { + goto close_socket; + } + + rc = connect(socket_vector[1], &sa[0].addr, cb); + Assert(rc != SOCKET_ERROR); + if (rc == SOCKET_ERROR) + { + goto close_socket; + } + } + + for (int i = 0; i < 2; ++i) { + SOCKET s = socket_vector[i]; + u_long mode = 1; + + int status = ioctlsocket(s, FIONBIO, &mode); + if (status == SOCKET_ERROR) { + LogRel(("FIONBIO: %R[sockerr]\n", WSAGetLastError())); + } + } + + LogFlowFuncLeaveRC(VINF_SUCCESS); + return VINF_SUCCESS; + +close_socket: + if (listener != INVALID_SOCKET) + closesocket(listener); + + if (socket_vector[0] != INVALID_SOCKET) + closesocket(socket_vector[0]); + + if (socket_vector[1] != INVALID_SOCKET) + closesocket(socket_vector[1]); + + LogFlowFuncLeaveRC(VERR_INTERNAL_ERROR); + return VERR_INTERNAL_ERROR; +} diff --git a/src/VBox/NetworkServices/NAT/VBoxNetLwipNAT.cpp b/src/VBox/NetworkServices/NAT/VBoxNetLwipNAT.cpp new file mode 100644 index 00000000..b07d404c --- /dev/null +++ b/src/VBox/NetworkServices/NAT/VBoxNetLwipNAT.cpp @@ -0,0 +1,2352 @@ +/* $Id: VBoxNetLwipNAT.cpp $ */ +/** @file + * VBoxNetNAT - NAT Service for connecting to IntNet. + */ + +/* + * Copyright (C) 2009-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +/* Must be included before winutils.h (lwip/def.h), otherwise Windows build breaks. */ +#define LOG_GROUP LOG_GROUP_NAT_SERVICE + +#include "winutils.h" + +#include <VBox/com/assert.h> +#include <VBox/com/com.h> +#include <VBox/com/listeners.h> +#include <VBox/com/string.h> +#include <VBox/com/Guid.h> +#include <VBox/com/array.h> +#include <VBox/com/ErrorInfo.h> +#include <VBox/com/errorprint.h> +#include <VBox/com/VirtualBox.h> +#include <VBox/com/NativeEventQueue.h> + +#include <iprt/net.h> +#include <iprt/initterm.h> +#include <iprt/alloca.h> +#ifndef RT_OS_WINDOWS +# include <arpa/inet.h> +#endif +#include <iprt/err.h> +#include <iprt/time.h> +#include <iprt/timer.h> +#include <iprt/thread.h> +#include <iprt/stream.h> +#include <iprt/path.h> +#include <iprt/param.h> +#include <iprt/pipe.h> +#include <iprt/string.h> +#include <iprt/mem.h> +#include <iprt/message.h> +#include <iprt/req.h> +#include <iprt/file.h> +#include <iprt/semaphore.h> +#include <iprt/cpp/utils.h> +#include <VBox/log.h> + +#include <iprt/buildconfig.h> +#include <iprt/getopt.h> +#include <iprt/process.h> + +#include <VBox/sup.h> +#include <VBox/intnet.h> +#include <VBox/intnetinline.h> +#include <VBox/vmm/pdmnetinline.h> +#include <VBox/vmm/vmm.h> +#include <VBox/version.h> + +#ifndef RT_OS_WINDOWS +# include <sys/poll.h> +# include <sys/socket.h> +# include <netinet/in.h> +# ifdef RT_OS_LINUX +# include <linux/icmp.h> /* ICMP_FILTER */ +# endif +# include <netinet/icmp6.h> +#endif + +#include <map> +#include <vector> +#include <iprt/sanitized/string> + +#include <stdio.h> + +#include "../NetLib/IntNetIf.h" +#include "../NetLib/VBoxPortForwardString.h" + +extern "C" +{ +/* bunch of LWIP headers */ +#include "lwip/sys.h" +#include "lwip/pbuf.h" +#include "lwip/netif.h" +#include "lwip/ethip6.h" +#include "lwip/nd6.h" // for proxy_na_hook +#include "lwip/mld6.h" +#include "lwip/tcpip.h" +#include "netif/etharp.h" + +#include "proxy.h" +#include "pxremap.h" +#include "portfwd.h" +} + +#include "VBoxLwipCore.h" + +#ifdef VBOX_RAWSOCK_DEBUG_HELPER +#if defined(VBOX_WITH_HARDENING) /* obviously */ \ + || defined(RT_OS_WINDOWS) /* not used */ \ + || defined(RT_OS_DARWIN) /* not necessary */ +# error Have you forgotten to turn off VBOX_RAWSOCK_DEBUG_HELPER? +#endif +/* ask the privileged helper to create a raw socket for us */ +extern "C" int getrawsock(int type); +#endif + + + +typedef struct NATSERVICEPORTFORWARDRULE +{ + PORTFORWARDRULE Pfr; + fwspec FWSpec; +} NATSERVICEPORTFORWARDRULE, *PNATSERVICEPORTFORWARDRULE; + +typedef std::vector<NATSERVICEPORTFORWARDRULE> VECNATSERVICEPF; +typedef VECNATSERVICEPF::iterator ITERATORNATSERVICEPF; +typedef VECNATSERVICEPF::const_iterator CITERATORNATSERVICEPF; + + +class VBoxNetLwipNAT +{ + static RTGETOPTDEF s_aGetOptDef[]; + + com::Utf8Str m_strNetworkName; + int m_uVerbosity; + + ComPtr<IVirtualBoxClient> virtualboxClient; + ComPtr<IVirtualBox> virtualbox; + ComPtr<IHost> m_host; + ComPtr<INATNetwork> m_net; + + RTMAC m_MacAddress; + INTNETIFCTX m_hIf; + RTTHREAD m_hThrRecv; + + /** Home folder location; used as default directory for several paths. */ + com::Utf8Str m_strHome; + + struct proxy_options m_ProxyOptions; + struct sockaddr_in m_src4; + struct sockaddr_in6 m_src6; + /** + * place for registered local interfaces. + */ + ip4_lomap m_lo2off[10]; + ip4_lomap_desc m_loOptDescriptor; + + uint16_t m_u16Mtu; + netif m_LwipNetIf; + + VECNATSERVICEPF m_vecPortForwardRule4; + VECNATSERVICEPF m_vecPortForwardRule6; + + class Listener + { + class Adapter; + typedef ListenerImpl<Adapter, VBoxNetLwipNAT *> Impl; + + ComObjPtr<Impl> m_pListenerImpl; + ComPtr<IEventSource> m_pEventSource; + + public: + HRESULT init(VBoxNetLwipNAT *pNAT); + void uninit(); + + template <typename IEventful> + HRESULT listen(const ComPtr<IEventful> &pEventful, + const VBoxEventType_T aEvents[]); + HRESULT unlisten(); + + private: + HRESULT doListen(const ComPtr<IEventSource> &pEventSource, + const VBoxEventType_T aEvents[]); + }; + + Listener m_ListenerNATNet; + Listener m_ListenerVirtualBox; + Listener m_ListenerVBoxClient; + +public: + VBoxNetLwipNAT(); + ~VBoxNetLwipNAT(); + + RTEXITCODE parseArgs(int argc, char *argv[]); + + int init(); + int run(); + void shutdown(); + +private: + RTEXITCODE usage(); + + int initCom(); + int initHome(); + int initLog(); + int initIPv4(); + int initIPv4LoopbackMap(); + int initIPv6(); + int initComEvents(); + + int getExtraData(com::Utf8Str &strValueOut, const char *pcszKey); + + static void reportError(const char *a_pcszFormat, ...) RT_IPRT_FORMAT_ATTR(1, 2); + + static HRESULT reportComError(ComPtr<IUnknown> iface, + const com::Utf8Str &strContext, + HRESULT hrc); + static void reportErrorInfoList(const com::ErrorInfo &info, + const com::Utf8Str &strContext); + static void reportErrorInfo(const com::ErrorInfo &info); + + void initIPv4RawSock(); + void initIPv6RawSock(); + + static DECLCALLBACK(void) onLwipTcpIpInit(void *arg); + static DECLCALLBACK(void) onLwipTcpIpFini(void *arg); + static DECLCALLBACK(err_t) netifInit(netif *pNetif) RT_NOTHROW_PROTO; + + HRESULT HandleEvent(VBoxEventType_T aEventType, IEvent *pEvent); + + const char **getHostNameservers(); + + int fetchNatPortForwardRules(VECNATSERVICEPF &vec, bool fIsIPv6); + static int natServiceProcessRegisteredPf(VECNATSERVICEPF &vecPf); + static int natServicePfRegister(NATSERVICEPORTFORWARDRULE &natServicePf); + + static DECLCALLBACK(int) receiveThread(RTTHREAD hThreadSelf, void *pvUser); + + /* input from intnet */ + static DECLCALLBACK(void) processFrame(void *pvUser, void *pvFrame, uint32_t cbFrame); + + /* output to intnet */ + static DECLCALLBACK(err_t) netifLinkoutput(netif *pNetif, pbuf *pBuf) RT_NOTHROW_PROTO; +}; + + + +VBoxNetLwipNAT::VBoxNetLwipNAT() + : m_uVerbosity(0), + m_hThrRecv(NIL_RTTHREAD) +{ + LogFlowFuncEnter(); + + RT_ZERO(m_ProxyOptions.ipv4_addr); + RT_ZERO(m_ProxyOptions.ipv4_mask); + RT_ZERO(m_ProxyOptions.ipv6_addr); + m_ProxyOptions.ipv6_enabled = 0; + m_ProxyOptions.ipv6_defroute = 0; + m_ProxyOptions.icmpsock4 = INVALID_SOCKET; + m_ProxyOptions.icmpsock6 = INVALID_SOCKET; + m_ProxyOptions.tftp_root = NULL; + m_ProxyOptions.src4 = NULL; + m_ProxyOptions.src6 = NULL; + RT_ZERO(m_src4); + RT_ZERO(m_src6); + m_src4.sin_family = AF_INET; + m_src6.sin6_family = AF_INET6; +#if HAVE_SA_LEN + m_src4.sin_len = sizeof(m_src4); + m_src6.sin6_len = sizeof(m_src6); +#endif + m_ProxyOptions.lomap_desc = NULL; + m_ProxyOptions.nameservers = NULL; + + m_LwipNetIf.name[0] = 'N'; + m_LwipNetIf.name[1] = 'T'; + + m_MacAddress.au8[0] = 0x52; + m_MacAddress.au8[1] = 0x54; + m_MacAddress.au8[2] = 0; + m_MacAddress.au8[3] = 0x12; + m_MacAddress.au8[4] = 0x35; + m_MacAddress.au8[5] = 0; + + RT_ZERO(m_lo2off); + m_loOptDescriptor.lomap = NULL; + m_loOptDescriptor.num_lomap = 0; + + LogFlowFuncLeave(); +} + + +VBoxNetLwipNAT::~VBoxNetLwipNAT() +{ + if (m_ProxyOptions.tftp_root) + { + RTStrFree((char *)m_ProxyOptions.tftp_root); + m_ProxyOptions.tftp_root = NULL; + } + if (m_ProxyOptions.nameservers) + { + const char **pv = m_ProxyOptions.nameservers; + while (*pv) + { + RTStrFree((char*)*pv); + pv++; + } + RTMemFree(m_ProxyOptions.nameservers); + m_ProxyOptions.nameservers = NULL; + } +} + + +/** + * Command line options. + */ +RTGETOPTDEF VBoxNetLwipNAT::s_aGetOptDef[] = +{ + { "--network", 'n', RTGETOPT_REQ_STRING }, + { "--verbose", 'v', RTGETOPT_REQ_NOTHING }, +}; + + +/** Icky hack to tell the caller it should exit with RTEXITCODE_SUCCESS */ +#define RTEXITCODE_DONE RTEXITCODE_32BIT_HACK + +RTEXITCODE +VBoxNetLwipNAT::usage() +{ + RTPrintf("%s Version %sr%u\n" + "Copyright (C) 2009-" VBOX_C_YEAR " " VBOX_VENDOR "\n" + "\n" + "Usage: %s <options>\n" + "\n" + "Options:\n", + RTProcShortName(), RTBldCfgVersion(), RTBldCfgRevision(), + RTProcShortName()); + for (size_t i = 0; i < RT_ELEMENTS(s_aGetOptDef); ++i) + RTPrintf(" -%c, %s\n", s_aGetOptDef[i].iShort, s_aGetOptDef[i].pszLong); + + return RTEXITCODE_DONE; +} + + +RTEXITCODE +VBoxNetLwipNAT::parseArgs(int argc, char *argv[]) +{ + unsigned int uVerbosity = 0; + int rc; + + RTGETOPTSTATE State; + rc = RTGetOptInit(&State, argc, argv, + s_aGetOptDef, RT_ELEMENTS(s_aGetOptDef), + 1, 0); + + int ch; + RTGETOPTUNION Val; + while ((ch = RTGetOpt(&State, &Val)) != 0) + { + switch (ch) + { + case 'n': /* --network */ + if (m_strNetworkName.isNotEmpty()) + return RTMsgErrorExit(RTEXITCODE_SYNTAX, "multiple --network options"); + m_strNetworkName = Val.psz; + break; + + case 'v': /* --verbose */ + ++uVerbosity; + break; + + + /* + * Standard options recognized by RTGetOpt() + */ + + case 'V': /* --version */ + RTPrintf("%sr%u\n", RTBldCfgVersion(), RTBldCfgRevision()); + return RTEXITCODE_DONE; + + case 'h': /* --help */ + return usage(); + + case VINF_GETOPT_NOT_OPTION: + return RTMsgErrorExit(RTEXITCODE_SYNTAX, "unexpected non-option argument"); + + default: + return RTGetOptPrintError(ch, &Val); + } + } + + if (m_strNetworkName.isEmpty()) + return RTMsgErrorExit(RTEXITCODE_SYNTAX, "missing --network option"); + + m_uVerbosity = uVerbosity; + return RTEXITCODE_SUCCESS; +} + + +/** + * Perform actual initialization. + * + * This code runs on the main thread. Establish COM connection with + * VBoxSVC so that we can do API calls. Starts the LWIP thread. + */ +int VBoxNetLwipNAT::init() +{ + HRESULT hrc; + int rc; + + LogFlowFuncEnter(); + + /* Get the COM API set up. */ + rc = initCom(); + if (RT_FAILURE(rc)) + return rc; + + /* Get the home folder location. It's ok if it fails. */ + initHome(); + + /* + * We get the network name on the command line. Get hold of its + * API object to get the rest of the configuration from. + */ + hrc = virtualbox->FindNATNetworkByName(com::Bstr(m_strNetworkName).raw(), + m_net.asOutParam()); + if (FAILED(hrc)) + { + reportComError(virtualbox, "FindNATNetworkByName", hrc); + return VERR_NOT_FOUND; + } + + /* + * Now that we know the network name and have ensured that it + * indeed exists we can create the release log file. + */ + initLog(); + + // resolver changes are reported on vbox but are retrieved from + // host so stash a pointer for future lookups + hrc = virtualbox->COMGETTER(Host)(m_host.asOutParam()); + AssertComRCReturn(hrc, VERR_INTERNAL_ERROR); + + + /* Get the settings related to IPv4. */ + rc = initIPv4(); + if (RT_FAILURE(rc)) + return rc; + + /* Get the settings related to IPv6. */ + rc = initIPv6(); + if (RT_FAILURE(rc)) + return rc; + + + fetchNatPortForwardRules(m_vecPortForwardRule4, /* :fIsIPv6 */ false); + if (m_ProxyOptions.ipv6_enabled) + fetchNatPortForwardRules(m_vecPortForwardRule6, /* :fIsIPv6 */ true); + + + if (m_strHome.isNotEmpty()) + { + com::Utf8StrFmt strTftpRoot("%s%c%s", m_strHome.c_str(), RTPATH_DELIMITER, "TFTP"); + char *pszStrTemp; // avoid const char ** vs char ** + rc = RTStrUtf8ToCurrentCP(&pszStrTemp, strTftpRoot.c_str()); + AssertRC(rc); + m_ProxyOptions.tftp_root = pszStrTemp; + } + + m_ProxyOptions.nameservers = getHostNameservers(); + + initComEvents(); + /* end of COM initialization */ + + /* connect to the intnet */ + rc = IntNetR3IfCreate(&m_hIf, m_strNetworkName.c_str()); + if (RT_SUCCESS(rc)) + rc = IntNetR3IfSetActive(m_hIf, true /*fActive*/); + + LogFlowFuncLeaveRC(rc); + return rc; +} + + +/** + * Primary COM initialization performed on the main thread. + * + * This initializes COM and obtains VirtualBox Client and VirtualBox + * objects. + * + * @note The member variables for them are in the base class. We + * currently do it here so that we can report errors properly, because + * the base class' VBoxNetBaseService::init() is a bit naive and + * fixing that would just create unnecessary churn for little + * immediate gain. It's easier to ignore the base class code and do + * it ourselves and do the refactoring later. + */ +int VBoxNetLwipNAT::initCom() +{ + HRESULT hrc; + + hrc = com::Initialize(); + if (FAILED(hrc)) + { +#ifdef VBOX_WITH_XPCOM + if (hrc == NS_ERROR_FILE_ACCESS_DENIED) + { + char szHome[RTPATH_MAX] = ""; + int vrc = com::GetVBoxUserHomeDirectory(szHome, sizeof(szHome), false); + if (RT_SUCCESS(vrc)) + { + return RTMsgErrorExit(RTEXITCODE_INIT, + "Failed to initialize COM: %s: %Rhrf", + szHome, hrc); + } + } +#endif /* VBOX_WITH_XPCOM */ + return RTMsgErrorExit(RTEXITCODE_INIT, + "Failed to initialize COM: %Rhrf", hrc); + } + + hrc = virtualboxClient.createInprocObject(CLSID_VirtualBoxClient); + if (FAILED(hrc)) + { + reportError("Failed to create VirtualBox Client object: %Rhra", hrc); + return VERR_GENERAL_FAILURE; + } + + hrc = virtualboxClient->COMGETTER(VirtualBox)(virtualbox.asOutParam()); + if (FAILED(hrc)) + { + reportError("Failed to obtain VirtualBox object: %Rhra", hrc); + return VERR_GENERAL_FAILURE; + } + + return VINF_SUCCESS; +} + + +/** + * Get the VirtualBox home folder. + * + * It is used as the base directory for the default release log file + * and for the TFTP root location. + */ +int VBoxNetLwipNAT::initHome() +{ + HRESULT hrc; + int rc; + + com::Bstr bstrHome; + hrc = virtualbox->COMGETTER(HomeFolder)(bstrHome.asOutParam()); + if (SUCCEEDED(hrc)) + { + m_strHome = bstrHome; + return VINF_SUCCESS; + } + + /* + * In the unlikely event that we have failed to retrieve + * HomeFolder via the API, try the fallback method. Note that + * despite "com" namespace it does not use COM. + */ + char szHome[RTPATH_MAX] = ""; + rc = com::GetVBoxUserHomeDirectory(szHome, sizeof(szHome), false); + if (RT_SUCCESS(rc)) + { + m_strHome = szHome; + return VINF_SUCCESS; + } + + return rc; +} + + +/* + * Read IPv4 related settings and do necessary initialization. These + * settings will be picked up by the proxy on the lwIP thread. See + * onLwipTcpIpInit(). + */ +int VBoxNetLwipNAT::initIPv4() +{ + HRESULT hrc; + int rc; + + AssertReturn(m_net.isNotNull(), VERR_GENERAL_FAILURE); + + + /* + * IPv4 address and mask. + */ + com::Bstr bstrIPv4Prefix; + hrc = m_net->COMGETTER(Network)(bstrIPv4Prefix.asOutParam()); + if (FAILED(hrc)) + { + reportComError(m_net, "Network", hrc); + return VERR_GENERAL_FAILURE; + } + + RTNETADDRIPV4 Net4, Mask4; + int iPrefixLength; + rc = RTNetStrToIPv4Cidr(com::Utf8Str(bstrIPv4Prefix).c_str(), + &Net4, &iPrefixLength); + if (RT_FAILURE(rc)) + { + reportError("Failed to parse IPv4 prefix %ls\n", bstrIPv4Prefix.raw()); + return rc; + } + + if (iPrefixLength > 30 || 0 >= iPrefixLength) + { + reportError("Invalid IPv4 prefix length %d\n", iPrefixLength); + return VERR_INVALID_PARAMETER; + } + + rc = RTNetPrefixToMaskIPv4(iPrefixLength, &Mask4); + AssertRCReturn(rc, rc); + + /** @todo r=uwe Check the address is unicast, not a loopback, etc. */ + + RTNETADDRIPV4 Addr4; + Addr4.u = Net4.u | RT_H2N_U32_C(0x00000001); + + memcpy(&m_ProxyOptions.ipv4_addr, &Addr4, sizeof(ip_addr)); + memcpy(&m_ProxyOptions.ipv4_mask, &Mask4, sizeof(ip_addr)); + + + /* Raw socket for ICMP. */ + initIPv4RawSock(); + + + /* IPv4 source address (host), if configured. */ + com::Utf8Str strSourceIp4; + rc = getExtraData(strSourceIp4, "SourceIp4"); + if (RT_SUCCESS(rc) && strSourceIp4.isNotEmpty()) + { + RTNETADDRIPV4 addr; + rc = RTNetStrToIPv4Addr(strSourceIp4.c_str(), &addr); + if (RT_SUCCESS(rc)) + { + m_src4.sin_addr.s_addr = addr.u; + m_ProxyOptions.src4 = &m_src4; + + LogRel(("Will use %RTnaipv4 as IPv4 source address\n", + m_src4.sin_addr.s_addr)); + } + else + { + LogRel(("Failed to parse \"%s\" IPv4 source address specification\n", + strSourceIp4.c_str())); + } + } + + /* Make host's loopback(s) available from inside the natnet */ + initIPv4LoopbackMap(); + + return VINF_SUCCESS; +} + + +/** + * Create raw IPv4 socket for sending and snooping ICMP. + */ +void VBoxNetLwipNAT::initIPv4RawSock() +{ + SOCKET icmpsock4 = INVALID_SOCKET; + +#ifndef RT_OS_DARWIN + const int icmpstype = SOCK_RAW; +#else + /* on OS X it's not privileged */ + const int icmpstype = SOCK_DGRAM; +#endif + + icmpsock4 = socket(AF_INET, icmpstype, IPPROTO_ICMP); + if (icmpsock4 == INVALID_SOCKET) + { + perror("IPPROTO_ICMP"); +#ifdef VBOX_RAWSOCK_DEBUG_HELPER + icmpsock4 = getrawsock(AF_INET); +#endif + } + + if (icmpsock4 != INVALID_SOCKET) + { +#ifdef ICMP_FILTER // Linux specific + struct icmp_filter flt = { + ~(uint32_t)( + (1U << ICMP_ECHOREPLY) + | (1U << ICMP_DEST_UNREACH) + | (1U << ICMP_TIME_EXCEEDED) + ) + }; + + int status = setsockopt(icmpsock4, SOL_RAW, ICMP_FILTER, + &flt, sizeof(flt)); + if (status < 0) + { + perror("ICMP_FILTER"); + } +#endif + } + + m_ProxyOptions.icmpsock4 = icmpsock4; +} + + +/** + * Init mapping from the natnet's IPv4 addresses to host's IPv4 + * loopbacks. Plural "loopbacks" because it's now quite common to run + * services on loopback addresses other than 127.0.0.1. E.g. a + * caching dns proxy on 127.0.1.1 or 127.0.0.53. + */ +int VBoxNetLwipNAT::initIPv4LoopbackMap() +{ + HRESULT hrc; + int rc; + + com::SafeArray<BSTR> aStrLocalMappings; + hrc = m_net->COMGETTER(LocalMappings)(ComSafeArrayAsOutParam(aStrLocalMappings)); + if (FAILED(hrc)) + { + reportComError(m_net, "LocalMappings", hrc); + return VERR_GENERAL_FAILURE; + } + + if (aStrLocalMappings.size() == 0) + return VINF_SUCCESS; + + + /* netmask in host order, to verify the offsets */ + uint32_t uMask = RT_N2H_U32(ip4_addr_get_u32(&m_ProxyOptions.ipv4_mask)); + + + /* + * Process mappings of the form "127.x.y.z=off" + */ + unsigned int dst = 0; /* typeof(ip4_lomap_desc::num_lomap) */ + for (size_t i = 0; i < aStrLocalMappings.size(); ++i) + { + com::Utf8Str strMapping(aStrLocalMappings[i]); + const char *pcszRule = strMapping.c_str(); + LogRel(("IPv4 loopback mapping %zu: %s\n", i, pcszRule)); + + RTNETADDRIPV4 Loopback4; + char *pszNext; + rc = RTNetStrToIPv4AddrEx(pcszRule, &Loopback4, &pszNext); + if (RT_FAILURE(rc)) + { + LogRel(("Failed to parse IPv4 address: %Rra\n", rc)); + continue; + } + + if (Loopback4.au8[0] != 127) + { + LogRel(("Not an IPv4 loopback address\n")); + continue; + } + + if (rc != VWRN_TRAILING_CHARS) + { + LogRel(("Missing right hand side\n")); + continue; + } + + pcszRule = RTStrStripL(pszNext); + if (*pcszRule != '=') + { + LogRel(("Invalid rule format\n")); + continue; + } + + pcszRule = RTStrStripL(pcszRule+1); + if (*pszNext == '\0') + { + LogRel(("Empty right hand side\n")); + continue; + } + + uint32_t u32Offset; + rc = RTStrToUInt32Ex(pcszRule, &pszNext, 10, &u32Offset); + if (rc != VINF_SUCCESS && rc != VWRN_TRAILING_SPACES) + { + LogRel(("Invalid offset\n")); + continue; + } + + if (u32Offset <= 1 || u32Offset == ~uMask) + { + LogRel(("Offset maps to a reserved address\n")); + continue; + } + + if ((u32Offset & uMask) != 0) + { + LogRel(("Offset exceeds the network size\n")); + continue; + } + + if (dst >= RT_ELEMENTS(m_lo2off)) + { + LogRel(("Ignoring the mapping, too many mappings already\n")); + continue; + } + + ip4_addr_set_u32(&m_lo2off[dst].loaddr, Loopback4.u); + m_lo2off[dst].off = u32Offset; + ++dst; + } + + if (dst > 0) + { + m_loOptDescriptor.lomap = m_lo2off; + m_loOptDescriptor.num_lomap = dst; + m_ProxyOptions.lomap_desc = &m_loOptDescriptor; + } + + return VINF_SUCCESS; +} + + +/* + * Read IPv6 related settings and do necessary initialization. These + * settings will be picked up by the proxy on the lwIP thread. See + * onLwipTcpIpInit(). + */ +int VBoxNetLwipNAT::initIPv6() +{ + HRESULT hrc; + int rc; + + AssertReturn(m_net.isNotNull(), VERR_GENERAL_FAILURE); + + + /* Is IPv6 enabled for this network at all? */ + BOOL fIPv6Enabled = FALSE; + hrc = m_net->COMGETTER(IPv6Enabled)(&fIPv6Enabled); + if (FAILED(hrc)) + { + reportComError(m_net, "IPv6Enabled", hrc); + return VERR_GENERAL_FAILURE; + } + + m_ProxyOptions.ipv6_enabled = !!fIPv6Enabled; + if (!fIPv6Enabled) + return VINF_SUCCESS; + + + /* + * IPv6 address. + */ + com::Bstr bstrIPv6Prefix; + hrc = m_net->COMGETTER(IPv6Prefix)(bstrIPv6Prefix.asOutParam()); + if (FAILED(hrc)) + { + reportComError(m_net, "IPv6Prefix", hrc); + return VERR_GENERAL_FAILURE; + } + + RTNETADDRIPV6 Net6; + int iPrefixLength; + rc = RTNetStrToIPv6Cidr(com::Utf8Str(bstrIPv6Prefix).c_str(), + &Net6, &iPrefixLength); + if (RT_FAILURE(rc)) + { + reportError("Failed to parse IPv6 prefix %ls\n", bstrIPv6Prefix.raw()); + return rc; + } + + /* Allow both addr:: and addr::/64 */ + if (iPrefixLength == 128) /* no length was specified after the address? */ + iPrefixLength = 64; /* take it to mean /64 which we require anyway */ + else if (iPrefixLength != 64) + { + reportError("Invalid IPv6 prefix length %d," + " must be 64.\n", iPrefixLength); + return rc; + } + + /* Verify the address is unicast. */ + if ( ((Net6.au8[0] & 0xe0) != 0x20) /* global 2000::/3 */ + && ((Net6.au8[0] & 0xfe) != 0xfc)) /* local fc00::/7 */ + { + reportError("IPv6 prefix %RTnaipv6 is not unicast.\n", &Net6); + return VERR_INVALID_PARAMETER; + } + + /* Verify the interfaces ID part is zero */ + if (Net6.au64[1] != 0) + { + reportError("Non-zero bits in the interface ID part" + " of the IPv6 prefix %RTnaipv6/64.\n", &Net6); + return VERR_INVALID_PARAMETER; + } + + /* Use ...::1 as our address */ + RTNETADDRIPV6 Addr6 = Net6; + Addr6.au8[15] = 0x01; + memcpy(&m_ProxyOptions.ipv6_addr, &Addr6, sizeof(ip6_addr_t)); + + + /* + * Should we advertise ourselves as default IPv6 route? If the + * host doesn't have IPv6 connectivity, it's probably better not + * to, to prevent the guest from IPv6 connection attempts doomed + * to fail. + * + * We might want to make this modifiable while the natnet is + * running. + */ + BOOL fIPv6DefaultRoute = FALSE; + hrc = m_net->COMGETTER(AdvertiseDefaultIPv6RouteEnabled)(&fIPv6DefaultRoute); + if (FAILED(hrc)) + { + reportComError(m_net, "AdvertiseDefaultIPv6RouteEnabled", hrc); + return VERR_GENERAL_FAILURE; + } + + m_ProxyOptions.ipv6_defroute = fIPv6DefaultRoute; + + + /* Raw socket for ICMP. */ + initIPv6RawSock(); + + + /* IPv6 source address, if configured. */ + com::Utf8Str strSourceIp6; + rc = getExtraData(strSourceIp6, "SourceIp6"); + if (RT_SUCCESS(rc) && strSourceIp6.isNotEmpty()) + { + RTNETADDRIPV6 addr; + char *pszZone = NULL; + rc = RTNetStrToIPv6Addr(strSourceIp6.c_str(), &addr, &pszZone); + if (RT_SUCCESS(rc)) + { + memcpy(&m_src6.sin6_addr, &addr, sizeof(addr)); + m_ProxyOptions.src6 = &m_src6; + + LogRel(("Will use %RTnaipv6 as IPv6 source address\n", + &m_src6.sin6_addr)); + } + else + { + LogRel(("Failed to parse \"%s\" IPv6 source address specification\n", + strSourceIp6.c_str())); + } + } + + return VINF_SUCCESS; +} + + +/** + * Create raw IPv6 socket for sending and snooping ICMP6. + */ +void VBoxNetLwipNAT::initIPv6RawSock() +{ + SOCKET icmpsock6 = INVALID_SOCKET; + +#ifndef RT_OS_DARWIN + const int icmpstype = SOCK_RAW; +#else + /* on OS X it's not privileged */ + const int icmpstype = SOCK_DGRAM; +#endif + + icmpsock6 = socket(AF_INET6, icmpstype, IPPROTO_ICMPV6); + if (icmpsock6 == INVALID_SOCKET) + { + perror("IPPROTO_ICMPV6"); +#ifdef VBOX_RAWSOCK_DEBUG_HELPER + icmpsock6 = getrawsock(AF_INET6); +#endif + } + + if (icmpsock6 != INVALID_SOCKET) + { +#ifdef ICMP6_FILTER // Windows doesn't support RFC 3542 API + /* + * XXX: We do this here for now, not in pxping.c, to avoid + * name clashes between lwIP and system headers. + */ + struct icmp6_filter flt; + ICMP6_FILTER_SETBLOCKALL(&flt); + + ICMP6_FILTER_SETPASS(ICMP6_ECHO_REPLY, &flt); + + ICMP6_FILTER_SETPASS(ICMP6_DST_UNREACH, &flt); + ICMP6_FILTER_SETPASS(ICMP6_PACKET_TOO_BIG, &flt); + ICMP6_FILTER_SETPASS(ICMP6_TIME_EXCEEDED, &flt); + ICMP6_FILTER_SETPASS(ICMP6_PARAM_PROB, &flt); + + int status = setsockopt(icmpsock6, IPPROTO_ICMPV6, ICMP6_FILTER, + &flt, sizeof(flt)); + if (status < 0) + { + perror("ICMP6_FILTER"); + } +#endif + } + + m_ProxyOptions.icmpsock6 = icmpsock6; +} + + + +/** + * Adapter for the ListenerImpl template. It has to be a separate + * object because ListenerImpl deletes it. Just a small wrapper that + * delegates the real work back to VBoxNetLwipNAT. + */ +class VBoxNetLwipNAT::Listener::Adapter +{ + VBoxNetLwipNAT *m_pNAT; +public: + Adapter() : m_pNAT(NULL) {} + HRESULT init() { return init(NULL); } + void uninit() { m_pNAT = NULL; } + + HRESULT init(VBoxNetLwipNAT *pNAT) + { + m_pNAT = pNAT; + return S_OK; + } + + HRESULT HandleEvent(VBoxEventType_T aEventType, IEvent *pEvent) + { + if (RT_LIKELY(m_pNAT != NULL)) + return m_pNAT->HandleEvent(aEventType, pEvent); + else + return S_OK; + } +}; + + +HRESULT +VBoxNetLwipNAT::Listener::init(VBoxNetLwipNAT *pNAT) +{ + HRESULT hrc; + + hrc = m_pListenerImpl.createObject(); + if (FAILED(hrc)) + return hrc; + + hrc = m_pListenerImpl->init(new Adapter(), pNAT); + if (FAILED(hrc)) + { + VBoxNetLwipNAT::reportComError(m_pListenerImpl, "init", hrc); + return hrc; + } + + return hrc; +} + + +void +VBoxNetLwipNAT::Listener::uninit() +{ + unlisten(); + m_pListenerImpl.setNull(); +} + + +/* + * There's no base interface that exposes "eventSource" so fake it + * with a template. + */ +template <typename IEventful> +HRESULT +VBoxNetLwipNAT::Listener::listen(const ComPtr<IEventful> &pEventful, + const VBoxEventType_T aEvents[]) +{ + HRESULT hrc; + + if (m_pListenerImpl.isNull()) + return S_OK; + + ComPtr<IEventSource> pEventSource; + hrc = pEventful->COMGETTER(EventSource)(pEventSource.asOutParam()); + if (FAILED(hrc)) + { + VBoxNetLwipNAT::reportComError(pEventful, "EventSource", hrc); + return hrc; + } + + /* got a real interface, punt to the non-template code */ + hrc = doListen(pEventSource, aEvents); + if (FAILED(hrc)) + return hrc; + + return hrc; +} + + +HRESULT +VBoxNetLwipNAT::Listener::doListen(const ComPtr<IEventSource> &pEventSource, + const VBoxEventType_T aEvents[]) +{ + HRESULT hrc; + + com::SafeArray<VBoxEventType_T> aInteresting; + for (size_t i = 0; aEvents[i] != VBoxEventType_Invalid; ++i) + aInteresting.push_back(aEvents[i]); + + BOOL fActive = true; + hrc = pEventSource->RegisterListener(m_pListenerImpl, + ComSafeArrayAsInParam(aInteresting), + fActive); + if (FAILED(hrc)) + { + VBoxNetLwipNAT::reportComError(m_pEventSource, "RegisterListener", hrc); + return hrc; + } + + m_pEventSource = pEventSource; + return hrc; +} + + +HRESULT +VBoxNetLwipNAT::Listener::unlisten() +{ + HRESULT hrc; + + if (m_pEventSource.isNull()) + return S_OK; + + const ComPtr<IEventSource> pEventSource = m_pEventSource; + m_pEventSource.setNull(); + + hrc = pEventSource->UnregisterListener(m_pListenerImpl); + if (FAILED(hrc)) + { + VBoxNetLwipNAT::reportComError(pEventSource, "UnregisterListener", hrc); + return hrc; + } + + return hrc; +} + + + +/** + * Create and register API event listeners. + */ +int VBoxNetLwipNAT::initComEvents() +{ + /** + * @todo r=uwe These events are reported on both IVirtualBox and + * INATNetwork objects. We used to listen for them on our + * network, but it was changed later to listen on vbox. Leave it + * that way for now. Note that HandleEvent() has to do additional + * check for them to ignore events for other networks. + */ + static const VBoxEventType_T s_aNATNetEvents[] = { + VBoxEventType_OnNATNetworkPortForward, + VBoxEventType_OnNATNetworkSetting, + VBoxEventType_Invalid + }; + m_ListenerNATNet.init(this); + m_ListenerNATNet.listen(virtualbox, s_aNATNetEvents); // sic! + + static const VBoxEventType_T s_aVirtualBoxEvents[] = { + VBoxEventType_OnHostNameResolutionConfigurationChange, + VBoxEventType_OnNATNetworkStartStop, + VBoxEventType_Invalid + }; + m_ListenerVirtualBox.init(this); + m_ListenerVirtualBox.listen(virtualbox, s_aVirtualBoxEvents); + + static const VBoxEventType_T s_aVBoxClientEvents[] = { + VBoxEventType_OnVBoxSVCAvailabilityChanged, + VBoxEventType_Invalid + }; + m_ListenerVBoxClient.init(this); + m_ListenerVBoxClient.listen(virtualboxClient, s_aVBoxClientEvents); + + return VINF_SUCCESS; +} + + +/** + * Perform lwIP initialization on the lwIP "tcpip" thread. + * + * The lwIP thread was created in init() and this function is run + * before the main lwIP loop is started. It is responsible for + * setting up lwIP state, configuring interface(s), etc. + a*/ +/*static*/ +DECLCALLBACK(void) VBoxNetLwipNAT::onLwipTcpIpInit(void *arg) +{ + AssertPtrReturnVoid(arg); + VBoxNetLwipNAT *self = static_cast<VBoxNetLwipNAT *>(arg); + + HRESULT hrc = com::Initialize(); + AssertComRCReturnVoid(hrc); + + proxy_arp_hook = pxremap_proxy_arp; + proxy_ip4_divert_hook = pxremap_ip4_divert; + + proxy_na_hook = pxremap_proxy_na; + proxy_ip6_divert_hook = pxremap_ip6_divert; + + netif *pNetif = netif_add(&self->m_LwipNetIf /* Lwip Interface */, + &self->m_ProxyOptions.ipv4_addr, /* IP address*/ + &self->m_ProxyOptions.ipv4_mask, /* Network mask */ + &self->m_ProxyOptions.ipv4_addr, /* XXX: Gateway address */ + self /* state */, + VBoxNetLwipNAT::netifInit /* netif_init_fn */, + tcpip_input /* netif_input_fn */); + + AssertPtrReturnVoid(pNetif); + + LogRel(("netif %c%c%d: mac %RTmac\n", + pNetif->name[0], pNetif->name[1], pNetif->num, + pNetif->hwaddr)); + LogRel(("netif %c%c%d: inet %RTnaipv4 netmask %RTnaipv4\n", + pNetif->name[0], pNetif->name[1], pNetif->num, + pNetif->ip_addr, pNetif->netmask)); + for (int i = 0; i < LWIP_IPV6_NUM_ADDRESSES; ++i) { + if (!ip6_addr_isinvalid(netif_ip6_addr_state(pNetif, i))) { + LogRel(("netif %c%c%d: inet6 %RTnaipv6\n", + pNetif->name[0], pNetif->name[1], pNetif->num, + netif_ip6_addr(pNetif, i))); + } + } + + netif_set_up(pNetif); + netif_set_link_up(pNetif); + + if (self->m_ProxyOptions.ipv6_enabled) { + /* + * XXX: lwIP currently only ever calls mld6_joingroup() in + * nd6_tmr() for fresh tentative addresses, which is a wrong place + * to do it - but I'm not keen on fixing this properly for now + * (with correct handling of interface up and down transitions, + * etc). So stick it here as a kludge. + */ + for (int i = 0; i <= 1; ++i) { + ip6_addr_t *paddr = netif_ip6_addr(pNetif, i); + + ip6_addr_t solicited_node_multicast_address; + ip6_addr_set_solicitednode(&solicited_node_multicast_address, + paddr->addr[3]); + mld6_joingroup(paddr, &solicited_node_multicast_address); + } + + /* + * XXX: We must join the solicited-node multicast for the + * addresses we do IPv6 NA-proxy for. We map IPv6 loopback to + * proxy address + 1. We only need the low 24 bits, and those are + * fixed. + */ + { + ip6_addr_t solicited_node_multicast_address; + + ip6_addr_set_solicitednode(&solicited_node_multicast_address, + /* last 24 bits of the address */ + PP_HTONL(0x00000002)); + mld6_netif_joingroup(pNetif, &solicited_node_multicast_address); + } + } + + proxy_init(&self->m_LwipNetIf, &self->m_ProxyOptions); + + natServiceProcessRegisteredPf(self->m_vecPortForwardRule4); + natServiceProcessRegisteredPf(self->m_vecPortForwardRule6); +} + + +/** + * lwIP's callback to configure the interface. + * + * Called from onLwipTcpIpInit() via netif_add(). Called after the + * initerface is mostly initialized, and its IPv4 address is already + * configured. Here we still need to configure the MAC address and + * IPv6 addresses. It's best to consult the source of netif_add() for + * the exact details. + */ +/* static */ DECLCALLBACK(err_t) +VBoxNetLwipNAT::netifInit(netif *pNetif) RT_NOTHROW_DEF +{ + err_t rcLwip = ERR_OK; + + AssertPtrReturn(pNetif, ERR_ARG); + + VBoxNetLwipNAT *self = static_cast<VBoxNetLwipNAT *>(pNetif->state); + AssertPtrReturn(self, ERR_ARG); + + LogFlowFunc(("ENTER: pNetif[%c%c%d]\n", pNetif->name[0], pNetif->name[1], pNetif->num)); + /* validity */ + AssertReturn( pNetif->name[0] == 'N' + && pNetif->name[1] == 'T', ERR_ARG); + + + pNetif->hwaddr_len = sizeof(RTMAC); + memcpy(pNetif->hwaddr, &self->m_MacAddress, sizeof(RTMAC)); + + self->m_u16Mtu = 1500; // XXX: FIXME + pNetif->mtu = self->m_u16Mtu; + + pNetif->flags = NETIF_FLAG_BROADCAST + | NETIF_FLAG_ETHARP /* Don't bother driver with ARP and let Lwip resolve ARP handling */ + | NETIF_FLAG_ETHERNET; /* Lwip works with ethernet too */ + + pNetif->linkoutput = netifLinkoutput; /* ether-level-pipe */ + pNetif->output = etharp_output; /* ip-pipe */ + + if (self->m_ProxyOptions.ipv6_enabled) { + pNetif->output_ip6 = ethip6_output; + + /* IPv6 link-local address in slot 0 */ + netif_create_ip6_linklocal_address(pNetif, /* :from_mac_48bit */ 1); + netif_ip6_addr_set_state(pNetif, 0, IP6_ADDR_PREFERRED); // skip DAD + + /* INATNetwork::IPv6Prefix in slot 1 */ + memcpy(netif_ip6_addr(pNetif, 1), + &self->m_ProxyOptions.ipv6_addr, sizeof(ip6_addr_t)); + netif_ip6_addr_set_state(pNetif, 1, IP6_ADDR_PREFERRED); + +#if LWIP_IPV6_SEND_ROUTER_SOLICIT + pNetif->rs_count = 0; +#endif + } + + LogFlowFunc(("LEAVE: %d\n", rcLwip)); + return rcLwip; +} + + +/** + * Run the pumps. + * + * Spawn the intnet pump thread that gets packets from the intnet and + * feeds them to lwIP. Enter COM event loop here, on the main thread. + */ +int +VBoxNetLwipNAT::run() +{ + int rc; + + AssertReturn(m_hThrRecv == NIL_RTTHREAD, VERR_INVALID_STATE); + + /* spawn the lwIP tcpip thread */ + vboxLwipCoreInitialize(VBoxNetLwipNAT::onLwipTcpIpInit, this); + + /* spawn intnet input pump */ + rc = RTThreadCreate(&m_hThrRecv, + VBoxNetLwipNAT::receiveThread, this, + 0, /* :cbStack */ + RTTHREADTYPE_IO, RTTHREADFLAGS_WAITABLE, + "RECV"); + AssertRCReturn(rc, rc); + + /* main thread will run the API event queue pump */ + com::NativeEventQueue *pQueue = com::NativeEventQueue::getMainEventQueue(); + if (pQueue == NULL) + { + LogRel(("run: getMainEventQueue() == NULL\n")); + return VERR_GENERAL_FAILURE; + } + + /* dispatch API events to our listeners */ + for (;;) + { + rc = pQueue->processEventQueue(RT_INDEFINITE_WAIT); + if (rc == VERR_INTERRUPTED) + { + LogRel(("run: shutdown\n")); + break; + } + else if (rc != VINF_SUCCESS) + { + /* note any unexpected rc */ + LogRel(("run: processEventQueue: %Rrc\n", rc)); + } + } + + /* + * We are out of the event loop, so we were told to shut down. + * Tell other threads to wrap up. + */ + + /* tell the intnet input pump to terminate */ + IntNetR3IfWaitAbort(m_hIf); + + /* tell the lwIP tcpip thread to terminate */ + vboxLwipCoreFinalize(VBoxNetLwipNAT::onLwipTcpIpFini, this); + + rc = RTThreadWait(m_hThrRecv, 5000, NULL); + m_hThrRecv = NIL_RTTHREAD; + + return VINF_SUCCESS; +} + + +void +VBoxNetLwipNAT::shutdown() +{ + int rc; + + com::NativeEventQueue *pQueue = com::NativeEventQueue::getMainEventQueue(); + if (pQueue == NULL) + { + LogRel(("shutdown: getMainEventQueue() == NULL\n")); + return; + } + + /* unregister listeners */ + m_ListenerNATNet.unlisten(); + m_ListenerVirtualBox.unlisten(); + m_ListenerVBoxClient.unlisten(); + + /* tell the event loop in run() to stop */ + rc = pQueue->interruptEventQueueProcessing(); + if (RT_FAILURE(rc)) + LogRel(("shutdown: interruptEventQueueProcessing: %Rrc\n", rc)); +} + + +/** + * Run finalization on the lwIP "tcpip" thread. + */ +/* static */ +DECLCALLBACK(void) VBoxNetLwipNAT::onLwipTcpIpFini(void *arg) +{ + AssertPtrReturnVoid(arg); + VBoxNetLwipNAT *self = static_cast<VBoxNetLwipNAT *>(arg); + + /* XXX: proxy finalization */ + netif_set_link_down(&self->m_LwipNetIf); + netif_set_down(&self->m_LwipNetIf); + netif_remove(&self->m_LwipNetIf); +} + + +/** + * @note: this work on Event thread. + */ +HRESULT VBoxNetLwipNAT::HandleEvent(VBoxEventType_T aEventType, IEvent *pEvent) +{ + HRESULT hrc = S_OK; + switch (aEventType) + { + case VBoxEventType_OnNATNetworkSetting: + { + ComPtr<INATNetworkSettingEvent> pSettingsEvent(pEvent); + + com::Bstr networkName; + hrc = pSettingsEvent->COMGETTER(NetworkName)(networkName.asOutParam()); + AssertComRCReturn(hrc, hrc); + if (networkName != m_strNetworkName) + break; /* change not for our network */ + + // XXX: only handle IPv6 default route for now + if (!m_ProxyOptions.ipv6_enabled) + break; + + BOOL fIPv6DefaultRoute = FALSE; + hrc = pSettingsEvent->COMGETTER(AdvertiseDefaultIPv6RouteEnabled)(&fIPv6DefaultRoute); + AssertComRCReturn(hrc, hrc); + + if (m_ProxyOptions.ipv6_defroute == fIPv6DefaultRoute) + break; + + m_ProxyOptions.ipv6_defroute = fIPv6DefaultRoute; + tcpip_callback_with_block(proxy_rtadvd_do_quick, &m_LwipNetIf, 0); + break; + } + + case VBoxEventType_OnNATNetworkPortForward: + { + ComPtr<INATNetworkPortForwardEvent> pForwardEvent = pEvent; + + com::Bstr networkName; + hrc = pForwardEvent->COMGETTER(NetworkName)(networkName.asOutParam()); + AssertComRCReturn(hrc, hrc); + if (networkName != m_strNetworkName) + break; /* change not for our network */ + + BOOL fCreateFW; + hrc = pForwardEvent->COMGETTER(Create)(&fCreateFW); + AssertComRCReturn(hrc, hrc); + + BOOL fIPv6FW; + hrc = pForwardEvent->COMGETTER(Ipv6)(&fIPv6FW); + AssertComRCReturn(hrc, hrc); + + com::Bstr name; + hrc = pForwardEvent->COMGETTER(Name)(name.asOutParam()); + AssertComRCReturn(hrc, hrc); + + NATProtocol_T proto = NATProtocol_TCP; + hrc = pForwardEvent->COMGETTER(Proto)(&proto); + AssertComRCReturn(hrc, hrc); + + com::Bstr strHostAddr; + hrc = pForwardEvent->COMGETTER(HostIp)(strHostAddr.asOutParam()); + AssertComRCReturn(hrc, hrc); + + LONG lHostPort; + hrc = pForwardEvent->COMGETTER(HostPort)(&lHostPort); + AssertComRCReturn(hrc, hrc); + + com::Bstr strGuestAddr; + hrc = pForwardEvent->COMGETTER(GuestIp)(strGuestAddr.asOutParam()); + AssertComRCReturn(hrc, hrc); + + LONG lGuestPort; + hrc = pForwardEvent->COMGETTER(GuestPort)(&lGuestPort); + AssertComRCReturn(hrc, hrc); + + VECNATSERVICEPF& rules = fIPv6FW ? m_vecPortForwardRule6 + : m_vecPortForwardRule4; + + NATSERVICEPORTFORWARDRULE r; + RT_ZERO(r); + + r.Pfr.fPfrIPv6 = fIPv6FW; + + switch (proto) + { + case NATProtocol_TCP: + r.Pfr.iPfrProto = IPPROTO_TCP; + break; + case NATProtocol_UDP: + r.Pfr.iPfrProto = IPPROTO_UDP; + break; + + default: + LogRel(("Event: %s %s port-forwarding rule \"%s\": invalid protocol %d\n", + fCreateFW ? "Add" : "Remove", + fIPv6FW ? "IPv6" : "IPv4", + com::Utf8Str(name).c_str(), + (int)proto)); + goto port_forward_done; + } + + LogRel(("Event: %s %s port-forwarding rule \"%s\": %s %s%s%s:%d -> %s%s%s:%d\n", + fCreateFW ? "Add" : "Remove", + fIPv6FW ? "IPv6" : "IPv4", + com::Utf8Str(name).c_str(), + proto == NATProtocol_TCP ? "TCP" : "UDP", + /* from */ + fIPv6FW ? "[" : "", + com::Utf8Str(strHostAddr).c_str(), + fIPv6FW ? "]" : "", + lHostPort, + /* to */ + fIPv6FW ? "[" : "", + com::Utf8Str(strGuestAddr).c_str(), + fIPv6FW ? "]" : "", + lGuestPort)); + + if (name.length() > sizeof(r.Pfr.szPfrName)) + { + hrc = E_INVALIDARG; + goto port_forward_done; + } + + RTStrPrintf(r.Pfr.szPfrName, sizeof(r.Pfr.szPfrName), + "%s", com::Utf8Str(name).c_str()); + + RTStrPrintf(r.Pfr.szPfrHostAddr, sizeof(r.Pfr.szPfrHostAddr), + "%s", com::Utf8Str(strHostAddr).c_str()); + + /* XXX: limits should be checked */ + r.Pfr.u16PfrHostPort = (uint16_t)lHostPort; + + RTStrPrintf(r.Pfr.szPfrGuestAddr, sizeof(r.Pfr.szPfrGuestAddr), + "%s", com::Utf8Str(strGuestAddr).c_str()); + + /* XXX: limits should be checked */ + r.Pfr.u16PfrGuestPort = (uint16_t)lGuestPort; + + if (fCreateFW) /* Addition */ + { + int rc = natServicePfRegister(r); + if (RT_SUCCESS(rc)) + rules.push_back(r); + } + else /* Deletion */ + { + ITERATORNATSERVICEPF it; + for (it = rules.begin(); it != rules.end(); ++it) + { + /* compare */ + NATSERVICEPORTFORWARDRULE &natFw = *it; + if ( natFw.Pfr.iPfrProto == r.Pfr.iPfrProto + && natFw.Pfr.u16PfrHostPort == r.Pfr.u16PfrHostPort + && strncmp(natFw.Pfr.szPfrHostAddr, r.Pfr.szPfrHostAddr, INET6_ADDRSTRLEN) == 0 + && natFw.Pfr.u16PfrGuestPort == r.Pfr.u16PfrGuestPort + && strncmp(natFw.Pfr.szPfrGuestAddr, r.Pfr.szPfrGuestAddr, INET6_ADDRSTRLEN) == 0) + { + fwspec *pFwCopy = (fwspec *)RTMemDup(&natFw.FWSpec, sizeof(natFw.FWSpec)); + if (pFwCopy) + { + int status = portfwd_rule_del(pFwCopy); + if (status == 0) + rules.erase(it); /* (pFwCopy is owned by lwip thread now.) */ + else + RTMemFree(pFwCopy); + } + break; + } + } /* loop over vector elements */ + } /* condition add or delete */ + port_forward_done: + /* clean up strings */ + name.setNull(); + strHostAddr.setNull(); + strGuestAddr.setNull(); + break; + } + + case VBoxEventType_OnHostNameResolutionConfigurationChange: + { + const char **ppcszNameServers = getHostNameservers(); + err_t error; + + error = tcpip_callback_with_block(pxdns_set_nameservers, + ppcszNameServers, + /* :block */ 0); + if (error != ERR_OK && ppcszNameServers != NULL) + RTMemFree(ppcszNameServers); + break; + } + + case VBoxEventType_OnNATNetworkStartStop: + { + ComPtr <INATNetworkStartStopEvent> pStartStopEvent = pEvent; + + com::Bstr networkName; + hrc = pStartStopEvent->COMGETTER(NetworkName)(networkName.asOutParam()); + AssertComRCReturn(hrc, hrc); + if (networkName != m_strNetworkName) + break; /* change not for our network */ + + BOOL fStart = TRUE; + hrc = pStartStopEvent->COMGETTER(StartEvent)(&fStart); + AssertComRCReturn(hrc, hrc); + + if (!fStart) + shutdown(); + break; + } + + case VBoxEventType_OnVBoxSVCAvailabilityChanged: + { + LogRel(("VBoxSVC became unavailable, exiting.\n")); + shutdown(); + break; + } + + default: break; /* Shut up MSC. */ + } + return hrc; +} + + +/** + * Read the list of host's resolvers via the API. + * + * Called during initialization and in response to the + * VBoxEventType_OnHostNameResolutionConfigurationChange event. + */ +const char **VBoxNetLwipNAT::getHostNameservers() +{ + if (m_host.isNull()) + return NULL; + + com::SafeArray<BSTR> aNameServers; + HRESULT hrc = m_host->COMGETTER(NameServers)(ComSafeArrayAsOutParam(aNameServers)); + if (FAILED(hrc)) + return NULL; + + const size_t cNameServers = aNameServers.size(); + if (cNameServers == 0) + return NULL; + + const char **ppcszNameServers = + (const char **)RTMemAllocZ(sizeof(char *) * (cNameServers + 1)); + if (ppcszNameServers == NULL) + return NULL; + + size_t idxLast = 0; + for (size_t i = 0; i < cNameServers; ++i) + { + com::Utf8Str strNameServer(aNameServers[i]); + ppcszNameServers[idxLast] = RTStrDup(strNameServer.c_str()); + if (ppcszNameServers[idxLast] != NULL) + ++idxLast; + } + + if (idxLast == 0) + { + RTMemFree(ppcszNameServers); + return NULL; + } + + return ppcszNameServers; +} + + +/** + * Fetch port-forwarding rules via the API. + * + * Reads the initial sets of rules from VBoxSVC. The rules will be + * activated when all the initialization and plumbing is done. See + * natServiceProcessRegisteredPf(). + */ +int VBoxNetLwipNAT::fetchNatPortForwardRules(VECNATSERVICEPF &vec, bool fIsIPv6) +{ + HRESULT hrc; + + com::SafeArray<BSTR> rules; + if (fIsIPv6) + hrc = m_net->COMGETTER(PortForwardRules6)(ComSafeArrayAsOutParam(rules)); + else + hrc = m_net->COMGETTER(PortForwardRules4)(ComSafeArrayAsOutParam(rules)); + AssertComRCReturn(hrc, VERR_INTERNAL_ERROR); + + NATSERVICEPORTFORWARDRULE Rule; + for (size_t idxRules = 0; idxRules < rules.size(); ++idxRules) + { + Log(("%d-%s rule: %ls\n", idxRules, (fIsIPv6 ? "IPv6" : "IPv4"), rules[idxRules])); + RT_ZERO(Rule); + + int rc = netPfStrToPf(com::Utf8Str(rules[idxRules]).c_str(), fIsIPv6, + &Rule.Pfr); + if (RT_FAILURE(rc)) + continue; + + vec.push_back(Rule); + } + + return VINF_SUCCESS; +} + + +/** + * Activate the initial set of port-forwarding rules. + * + * Happens after lwIP and lwIP proxy is initialized, right before lwIP + * thread starts processing messages. + */ +/* static */ +int VBoxNetLwipNAT::natServiceProcessRegisteredPf(VECNATSERVICEPF& vecRules) +{ + ITERATORNATSERVICEPF it; + for (it = vecRules.begin(); it != vecRules.end(); ++it) + { + NATSERVICEPORTFORWARDRULE &natPf = *it; + + LogRel(("Loading %s port-forwarding rule \"%s\": %s %s%s%s:%d -> %s%s%s:%d\n", + natPf.Pfr.fPfrIPv6 ? "IPv6" : "IPv4", + natPf.Pfr.szPfrName, + natPf.Pfr.iPfrProto == IPPROTO_TCP ? "TCP" : "UDP", + /* from */ + natPf.Pfr.fPfrIPv6 ? "[" : "", + natPf.Pfr.szPfrHostAddr, + natPf.Pfr.fPfrIPv6 ? "]" : "", + natPf.Pfr.u16PfrHostPort, + /* to */ + natPf.Pfr.fPfrIPv6 ? "[" : "", + natPf.Pfr.szPfrGuestAddr, + natPf.Pfr.fPfrIPv6 ? "]" : "", + natPf.Pfr.u16PfrGuestPort)); + + natServicePfRegister(natPf); + } + + return VINF_SUCCESS; +} + + +/** + * Activate a single port-forwarding rule. + * + * This is used both when we activate all the initial rules on startup + * and when port-forwarding rules are changed and we are notified via + * an API event. + */ +/* static */ +int VBoxNetLwipNAT::natServicePfRegister(NATSERVICEPORTFORWARDRULE &natPf) +{ + int lrc; + + int sockFamily = (natPf.Pfr.fPfrIPv6 ? PF_INET6 : PF_INET); + int socketSpec; + switch(natPf.Pfr.iPfrProto) + { + case IPPROTO_TCP: + socketSpec = SOCK_STREAM; + break; + case IPPROTO_UDP: + socketSpec = SOCK_DGRAM; + break; + default: + return VERR_IGNORED; + } + + const char *pszHostAddr = natPf.Pfr.szPfrHostAddr; + if (pszHostAddr[0] == '\0') + { + if (sockFamily == PF_INET) + pszHostAddr = "0.0.0.0"; + else + pszHostAddr = "::"; + } + + lrc = fwspec_set(&natPf.FWSpec, + sockFamily, + socketSpec, + pszHostAddr, + natPf.Pfr.u16PfrHostPort, + natPf.Pfr.szPfrGuestAddr, + natPf.Pfr.u16PfrGuestPort); + if (lrc != 0) + return VERR_IGNORED; + + fwspec *pFwCopy = (fwspec *)RTMemDup(&natPf.FWSpec, sizeof(natPf.FWSpec)); + if (pFwCopy) + { + lrc = portfwd_rule_add(pFwCopy); + if (lrc == 0) + return VINF_SUCCESS; /* (pFwCopy is owned by lwip thread now.) */ + RTMemFree(pFwCopy); + } + else + LogRel(("Unable to allocate memory for %s rule \"%s\"\n", + natPf.Pfr.fPfrIPv6 ? "IPv6" : "IPv4", + natPf.Pfr.szPfrName)); + return VERR_IGNORED; +} + + +/** + * IntNetIf receive thread. Runs intnet pump with our processFrame() + * as input callback. + */ +/* static */ DECLCALLBACK(int) +VBoxNetLwipNAT::receiveThread(RTTHREAD hThreadSelf, void *pvUser) +{ + HRESULT hrc; + int rc; + + RT_NOREF(hThreadSelf); + + AssertReturn(pvUser != NULL, VERR_INVALID_PARAMETER); + VBoxNetLwipNAT *self = static_cast<VBoxNetLwipNAT *>(pvUser); + + /* do we relaly need to init com on this thread? */ + hrc = com::Initialize(); + if (FAILED(hrc)) + return VERR_GENERAL_FAILURE; + + rc = IntNetR3IfPumpPkts(self->m_hIf, VBoxNetLwipNAT::processFrame, self, + NULL /*pfnInputGso*/, NULL /*pvUserGso*/); + if (rc == VERR_SEM_DESTROYED) + return VINF_SUCCESS; + + LogRel(("receiveThread: IntNetR3IfPumpPkts: unexpected %Rrc\n", rc)); + return VERR_INVALID_STATE; +} + + +/** + * Process an incoming frame received from the intnet. + */ +/* static */ DECLCALLBACK(void) +VBoxNetLwipNAT::processFrame(void *pvUser, void *pvFrame, uint32_t cbFrame) +{ + AssertReturnVoid(pvFrame != NULL); + + /* shouldn't happen, but if it does, don't even bother */ + if (RT_UNLIKELY(cbFrame < sizeof(RTNETETHERHDR))) + return; + + /* we expect normal ethernet frame including .1Q and FCS */ + if (cbFrame > 1522) + return; + + AssertReturnVoid(pvUser != NULL); + VBoxNetLwipNAT *self = static_cast<VBoxNetLwipNAT *>(pvUser); + + struct pbuf *p = pbuf_alloc(PBUF_RAW, (u16_t)cbFrame + ETH_PAD_SIZE, PBUF_POOL); + if (RT_UNLIKELY(p == NULL)) + return; + + /* + * The code below is inlined version of: + * + * pbuf_header(p, -ETH_PAD_SIZE); // hide padding + * pbuf_take(p, pvFrame, cbFrame); + * pbuf_header(p, ETH_PAD_SIZE); // reveal padding + */ + struct pbuf *q = p; + uint8_t *pu8Chunk = (uint8_t *)pvFrame; + do { + uint8_t *payload = (uint8_t *)q->payload; + size_t len = q->len; + +#if ETH_PAD_SIZE + if (RT_LIKELY(q == p)) // single pbuf is large enough + { + payload += ETH_PAD_SIZE; + len -= ETH_PAD_SIZE; + } +#endif + memcpy(payload, pu8Chunk, len); + pu8Chunk += len; + q = q->next; + } while (RT_UNLIKELY(q != NULL)); + + /* pass input to lwIP: netif input funcion tcpip_input() */ + self->m_LwipNetIf.input(p, &self->m_LwipNetIf); +} + + +/** + * Send an outgoing frame from lwIP to intnet. + */ +/* static */ DECLCALLBACK(err_t) +VBoxNetLwipNAT::netifLinkoutput(netif *pNetif, pbuf *pPBuf) RT_NOTHROW_DEF +{ + int rc; + + AssertPtrReturn(pNetif, ERR_ARG); + AssertPtrReturn(pPBuf, ERR_ARG); + + VBoxNetLwipNAT *self = static_cast<VBoxNetLwipNAT *>(pNetif->state); + AssertPtrReturn(self, ERR_IF); + AssertReturn(pNetif == &self->m_LwipNetIf, ERR_IF); + + LogFlowFunc(("ENTER: pNetif[%c%c%d], pPbuf:%p\n", + pNetif->name[0], + pNetif->name[1], + pNetif->num, + pPBuf)); + + if (pPBuf->tot_len < sizeof(struct eth_hdr)) /* includes ETH_PAD_SIZE */ + return ERR_ARG; + + size_t cbFrame = (size_t)pPBuf->tot_len - ETH_PAD_SIZE; + INTNETFRAME Frame; + rc = IntNetR3IfQueryOutputFrame(self->m_hIf, (uint32_t)cbFrame, &Frame); + if (RT_FAILURE(rc)) + return ERR_MEM; + + pbuf_copy_partial(pPBuf, Frame.pvFrame, (u16_t)cbFrame, ETH_PAD_SIZE); + rc = IntNetR3IfOutputFrameCommit(self->m_hIf, &Frame); + if (RT_FAILURE(rc)) + return ERR_IF; + + LogFlowFunc(("LEAVE: %d\n", ERR_OK)); + return ERR_OK; +} + + +/** + * Retrieve network-specific extra data item. + */ +int VBoxNetLwipNAT::getExtraData(com::Utf8Str &strValueOut, const char *pcszKey) +{ + HRESULT hrc; + + AssertReturn(!virtualbox.isNull(), E_FAIL); + AssertReturn(m_strNetworkName.isNotEmpty(), E_FAIL); + AssertReturn(pcszKey != NULL, E_FAIL); + AssertReturn(*pcszKey != '\0', E_FAIL); + + com::BstrFmt bstrKey("NAT/%s/%s", m_strNetworkName.c_str(), pcszKey); + com::Bstr bstrValue; + hrc = virtualbox->GetExtraData(bstrKey.raw(), bstrValue.asOutParam()); + if (FAILED(hrc)) + { + reportComError(virtualbox, "GetExtraData", hrc); + return VERR_GENERAL_FAILURE; + } + + strValueOut = bstrValue; + return VINF_SUCCESS; +} + + +/* static */ +HRESULT VBoxNetLwipNAT::reportComError(ComPtr<IUnknown> iface, + const com::Utf8Str &strContext, + HRESULT hrc) +{ + const com::ErrorInfo info(iface, COM_IIDOF(IUnknown)); + if (info.isFullAvailable() || info.isBasicAvailable()) + { + reportErrorInfoList(info, strContext); + } + else + { + if (strContext.isNotEmpty()) + reportError("%s: %Rhra", strContext.c_str(), hrc); + else + reportError("%Rhra", hrc); + } + + return hrc; +} + + +/* static */ +void VBoxNetLwipNAT::reportErrorInfoList(const com::ErrorInfo &info, + const com::Utf8Str &strContext) +{ + if (strContext.isNotEmpty()) + reportError("%s", strContext.c_str()); + + bool fFirst = true; + for (const com::ErrorInfo *pInfo = &info; + pInfo != NULL; + pInfo = pInfo->getNext()) + { + if (fFirst) + fFirst = false; + else + reportError("--------"); + + reportErrorInfo(*pInfo); + } +} + + +/* static */ +void VBoxNetLwipNAT::reportErrorInfo(const com::ErrorInfo &info) +{ +#if defined (RT_OS_WIN) + bool haveResultCode = info.isFullAvailable(); + bool haveComponent = true; + bool haveInterfaceID = true; +#else /* !RT_OS_WIN */ + bool haveResultCode = true; + bool haveComponent = info.isFullAvailable(); + bool haveInterfaceID = info.isFullAvailable(); +#endif + com::Utf8Str message; + if (info.getText().isNotEmpty()) + message = info.getText(); + + const char *pcszDetails = "Details: "; + const char *pcszComma = ", "; + const char *pcszSeparator = pcszDetails; + + if (haveResultCode) + { + message.appendPrintf("%s" "code %Rhrc (0x%RX32)", + pcszSeparator, info.getResultCode(), info.getResultCode()); + pcszSeparator = pcszComma; + } + + if (haveComponent) + { + message.appendPrintf("%s" "component %ls", + pcszSeparator, info.getComponent().raw()); + pcszSeparator = pcszComma; + } + + if (haveInterfaceID) + { + message.appendPrintf("%s" "interface %ls", + pcszSeparator, info.getInterfaceName().raw()); + pcszSeparator = pcszComma; + } + + if (info.getCalleeName().isNotEmpty()) + { + message.appendPrintf("%s" "callee %ls", + pcszSeparator, info.getCalleeName().raw()); + pcszSeparator = pcszComma; + } + + reportError("%s", message.c_str()); +} + + +/* static */ +void VBoxNetLwipNAT::reportError(const char *a_pcszFormat, ...) +{ + va_list ap; + + va_start(ap, a_pcszFormat); + com::Utf8Str message(a_pcszFormat, ap); + va_end(ap); + + RTMsgError("%s", message.c_str()); + LogRel(("%s", message.c_str())); +} + + + +/** + * Create release logger. + * + * The NAT network name is sanitized so that it can be used in a path + * component. By default the release log is written to the file + * ~/.VirtualBox/${netname}.log but its destiation and content can be + * overridden with VBOXNET_${netname}_RELEASE_LOG family of + * environment variables (also ..._DEST and ..._FLAGS). + */ +/* static */ +int VBoxNetLwipNAT::initLog() +{ + size_t cch; + int rc; + + if (m_strNetworkName.isEmpty()) + return VERR_MISSING; + + char szNetwork[RTPATH_MAX]; + rc = RTStrCopy(szNetwork, sizeof(szNetwork), m_strNetworkName.c_str()); + if (RT_FAILURE(rc)) + return rc; + + // sanitize network name to be usable as a path component + for (char *p = szNetwork; *p != '\0'; ++p) + { + if (RTPATH_IS_SEP(*p)) + *p = '_'; + } + + const char *pcszLogFile = NULL; + char szLogFile[RTPATH_MAX]; + if (m_strHome.isNotEmpty()) + { + cch = RTStrPrintf(szLogFile, sizeof(szLogFile), + "%s%c%s.log", m_strHome.c_str(), RTPATH_DELIMITER, szNetwork); + if (cch < sizeof(szLogFile)) + pcszLogFile = szLogFile; + } + + // sanitize network name some more to be usable as environment variable + for (char *p = szNetwork; *p != '\0'; ++p) + { + if (*p != '_' + && (*p < '0' || '9' < *p) + && (*p < 'a' || 'z' < *p) + && (*p < 'A' || 'Z' < *p)) + { + *p = '_'; + } + } + + char szEnvVarBase[128]; + const char *pcszEnvVarBase = szEnvVarBase; + cch = RTStrPrintf(szEnvVarBase, sizeof(szEnvVarBase), + "VBOXNET_%s_RELEASE_LOG", szNetwork); + if (cch >= sizeof(szEnvVarBase)) + pcszEnvVarBase = NULL; + + rc = com::VBoxLogRelCreate("NAT Network", + pcszLogFile, + RTLOGFLAGS_PREFIX_TIME_PROG, + "all all.restrict -default.restrict", + pcszEnvVarBase, + RTLOGDEST_FILE, + 32768 /* cMaxEntriesPerGroup */, + 0 /* cHistory */, + 0 /* uHistoryFileTime */, + 0 /* uHistoryFileSize */, + NULL /*pErrInfo*/); + + /* + * Provide immediate feedback if corresponding LogRel level is + * enabled. It's frustrating when you chase some rare event and + * discover you didn't actually have the corresponding log level + * enabled because of a typo in the environment variable name or + * its content. + */ +#define LOG_PING(_log) _log((#_log " enabled\n")) + LOG_PING(LogRel2); + LOG_PING(LogRel3); + LOG_PING(LogRel4); + LOG_PING(LogRel5); + LOG_PING(LogRel6); + LOG_PING(LogRel7); + LOG_PING(LogRel8); + LOG_PING(LogRel9); + LOG_PING(LogRel10); + LOG_PING(LogRel11); + LOG_PING(LogRel12); + + return rc; +} + + +/** + * Entry point. + */ +extern "C" DECLEXPORT(int) TrustedMain(int argc, char **argv, char **envp) +{ + LogFlowFuncEnter(); + NOREF(envp); + +#ifdef RT_OS_WINDOWS + WSADATA WsaData = {0}; + int err = WSAStartup(MAKEWORD(2,2), &WsaData); + if (err) + { + fprintf(stderr, "wsastartup: failed (%d)\n", err); + return RTEXITCODE_INIT; + } +#endif + + VBoxNetLwipNAT NAT; + + int rcExit = NAT.parseArgs(argc, argv); + if (rcExit != RTEXITCODE_SUCCESS) + { + /* messages are already printed */ + return rcExit == RTEXITCODE_DONE ? RTEXITCODE_SUCCESS : rcExit; + } + + int rc = NAT.init(); + if (RT_FAILURE(rc)) + return RTEXITCODE_INIT; + + NAT.run(); + + LogRel(("Terminating\n")); + return RTEXITCODE_SUCCESS; +} + + +#ifndef VBOX_WITH_HARDENING + +int main(int argc, char **argv, char **envp) +{ + int rc = RTR3InitExe(argc, &argv, RTR3INIT_FLAGS_SUPLIB); + if (RT_SUCCESS(rc)) + return TrustedMain(argc, argv, envp); + return RTMsgInitFailure(rc); +} + +# if defined(RT_OS_WINDOWS) + +# if 0 /* Some copy and paste from DHCP that nobody explained why was diabled. */ +static LRESULT CALLBACK WindowProc(HWND hwnd, + UINT uMsg, + WPARAM wParam, + LPARAM lParam +) +{ + if(uMsg == WM_DESTROY) + { + PostQuitMessage(0); + return 0; + } + return DefWindowProc (hwnd, uMsg, wParam, lParam); +} + +static LPCWSTR g_WndClassName = L"VBoxNetNatLwipClass"; + +static DWORD WINAPI MsgThreadProc(__in LPVOID lpParameter) +{ + HWND hwnd = 0; + HINSTANCE hInstance = (HINSTANCE)GetModuleHandle (NULL); + bool bExit = false; + + /* Register the Window Class. */ + WNDCLASS wc; + wc.style = 0; + wc.lpfnWndProc = WindowProc; + wc.cbClsExtra = 0; + wc.cbWndExtra = sizeof(void *); + wc.hInstance = hInstance; + wc.hIcon = NULL; + wc.hCursor = NULL; + wc.hbrBackground = (HBRUSH)(COLOR_BACKGROUND + 1); + wc.lpszMenuName = NULL; + wc.lpszClassName = g_WndClassName; + + ATOM atomWindowClass = RegisterClass(&wc); + + if (atomWindowClass != 0) + { + /* Create the window. */ + hwnd = CreateWindowEx(WS_EX_TOOLWINDOW | WS_EX_TRANSPARENT | WS_EX_TOPMOST, + g_WndClassName, g_WndClassName, WS_POPUPWINDOW, + -200, -200, 100, 100, NULL, NULL, hInstance, NULL); + + if (hwnd) + { + SetWindowPos(hwnd, HWND_TOPMOST, -200, -200, 0, 0, + SWP_NOACTIVATE | SWP_HIDEWINDOW | SWP_NOCOPYBITS | SWP_NOREDRAW | SWP_NOSIZE); + + MSG msg; + while (GetMessage(&msg, NULL, 0, 0)) + { + TranslateMessage(&msg); + DispatchMessage(&msg); + } + + DestroyWindow (hwnd); + + bExit = true; + } + + UnregisterClass (g_WndClassName, hInstance); + } + + if(bExit) + { + /* no need any accuracy here, in anyway the DHCP server usually gets terminated with TerminateProcess */ + exit(0); + } + + return 0; +} +# endif + + +/** (We don't want a console usually.) */ +int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) +{ + RT_NOREF(hInstance, hPrevInstance, lpCmdLine, nCmdShow); +# if 0 /* some copy and paste from DHCP that nobody explained why was diabled. */ + NOREF(hInstance); NOREF(hPrevInstance); NOREF(lpCmdLine); NOREF(nCmdShow); + + HANDLE hThread = CreateThread( + NULL, /*__in_opt LPSECURITY_ATTRIBUTES lpThreadAttributes, */ + 0, /*__in SIZE_T dwStackSize, */ + MsgThreadProc, /*__in LPTHREAD_START_ROUTINE lpStartAddress,*/ + NULL, /*__in_opt LPVOID lpParameter,*/ + 0, /*__in DWORD dwCreationFlags,*/ + NULL /*__out_opt LPDWORD lpThreadId*/ + ); + + if(hThread != NULL) + CloseHandle(hThread); + +# endif + return main(__argc, __argv, environ); +} +# endif /* RT_OS_WINDOWS */ + +#endif /* !VBOX_WITH_HARDENING */ diff --git a/src/VBox/NetworkServices/NAT/VBoxNetNATHardened.cpp b/src/VBox/NetworkServices/NAT/VBoxNetNATHardened.cpp new file mode 100644 index 00000000..34a0992b --- /dev/null +++ b/src/VBox/NetworkServices/NAT/VBoxNetNATHardened.cpp @@ -0,0 +1,37 @@ +/* $Id: VBoxNetNATHardened.cpp $ */ +/** @file + * VBoxNetNAT - Hardened main(). + */ + +/* + * Copyright (C) 2009-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#include <VBox/sup.h> + +#ifndef SERVICE_NAME +# error "Please define SERVICE_NAME" +#endif + +int main(int argc, char **argv, char **envp) +{ + return SUPR3HardenedMain(SERVICE_NAME, 0 /* fFlags */, argc, argv, envp); +} diff --git a/src/VBox/NetworkServices/NAT/dhcp6.h b/src/VBox/NetworkServices/NAT/dhcp6.h new file mode 100644 index 00000000..03b26eae --- /dev/null +++ b/src/VBox/NetworkServices/NAT/dhcp6.h @@ -0,0 +1,61 @@ +/* $Id: dhcp6.h $ */ +/** @file + * NAT Network - DHCPv6 protocol definitions. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#ifndef VBOX_INCLUDED_SRC_NAT_dhcp6_h +#define VBOX_INCLUDED_SRC_NAT_dhcp6_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +/* UDP ports */ +#define DHCP6_CLIENT_PORT 546 +#define DHCP6_SERVER_PORT 547 + +/* Message types */ +#define DHCP6_REPLY 7 +#define DHCP6_INFORMATION_REQUEST 11 +#define DHCP6_RELAY_FORW 12 +#define DHCP6_RELAY_REPLY 13 + +/* DUID types */ +#define DHCP6_DUID_LLT 1 +#define DHCP6_DUID_EN 2 +#define DHCP6_DUID_LL 3 + +/* Hardware type for DUID-LLT and DUID-LL */ +#define ARES_HRD_ETHERNET 1 /* RFC 826*/ + +/* Options */ +#define DHCP6_OPTION_CLIENTID 1 +#define DHCP6_OPTION_SERVERID 2 +#define DHCP6_OPTION_ORO 6 +#define DHCP6_OPTION_ELAPSED_TIME 8 +#define DHCP6_OPTION_STATUS_CODE 13 +#define DHCP6_OPTION_DNS_SERVERS 23 /* RFC 3646 */ +#define DHCP6_OPTION_DOMAIN_LIST 24 /* RFC 3646 */ + +#endif /* !VBOX_INCLUDED_SRC_NAT_dhcp6_h */ diff --git a/src/VBox/NetworkServices/NAT/fwtcp.c b/src/VBox/NetworkServices/NAT/fwtcp.c new file mode 100644 index 00000000..79cdfc04 --- /dev/null +++ b/src/VBox/NetworkServices/NAT/fwtcp.c @@ -0,0 +1,333 @@ +/* $Id: fwtcp.c $ */ +/** @file + * NAT Network - TCP port-forwarding. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#define LOG_GROUP LOG_GROUP_NAT_SERVICE + +#include "winutils.h" +#include "proxy.h" +#include "proxy_pollmgr.h" +#include "portfwd.h" +#include "pxtcp.h" + +#ifndef RT_OS_WINDOWS +#include <sys/types.h> +#include <sys/socket.h> +#include <arpa/inet.h> +#include <stdio.h> +#include <poll.h> + +#include <err.h> /* BSD'ism */ +#else +#include <stdio.h> +#include "winpoll.h" +#endif + +#include "lwip/opt.h" + +#include "lwip/sys.h" +#include "lwip/tcpip.h" + + +/** + */ +struct fwtcp { + /** + * Our poll manager handler. + */ + struct pollmgr_handler pmhdl; + + /** + * Forwarding specification. + */ + struct fwspec fwspec; + + /** + * Listening socket. + */ + SOCKET sock; + + /** + * Mailbox for new inbound connections. + * + * XXX: since we have single producer and single consumer we can + * use lockless ringbuf like for pxtcp. + */ + sys_mbox_t connmbox; + + struct tcpip_msg msg_connect; + struct tcpip_msg msg_delete; + + /** + * Linked list entry. + */ + struct fwtcp *next; +}; + + +static struct fwtcp *fwtcp_create(struct fwspec *); + +/* poll manager callback for fwtcp listening socket */ +static int fwtcp_pmgr_listen(struct pollmgr_handler *, SOCKET, int); + +/* lwip thread callbacks called via proxy_lwip_post() */ +static void fwtcp_pcb_connect(void *); +static void fwtcp_pcb_delete(void *); + + +/** + * Linked list of active fwtcp forwarders. + */ +struct fwtcp *fwtcp_list = NULL; + + +void +fwtcp_init(void) +{ + return; +} + + +void +fwtcp_add(struct fwspec *fwspec) +{ + struct fwtcp *fwtcp; + + fwtcp = fwtcp_create(fwspec); + if (fwtcp == NULL) { + DPRINTF0(("%s: failed to add rule for TCP ...\n", __func__)); + return; + } + + DPRINTF0(("%s\n", __func__)); + /* fwtcp_create has put fwtcp on the linked list */ +} + + +void +fwtcp_del(struct fwspec *fwspec) +{ + struct fwtcp *fwtcp; + struct fwtcp **pprev; + + for (pprev = &fwtcp_list; (fwtcp = *pprev) != NULL; pprev = &fwtcp->next) { + if (fwspec_equal(&fwtcp->fwspec, fwspec)) { + *pprev = fwtcp->next; + fwtcp->next = NULL; + break; + } + } + + if (fwtcp == NULL) { + DPRINTF0(("%s: not found\n", __func__)); + return; + } + + DPRINTF0(("%s\n", __func__)); + + pollmgr_del_slot(fwtcp->pmhdl.slot); + fwtcp->pmhdl.slot = -1; + + closesocket(fwtcp->sock); + fwtcp->sock = INVALID_SOCKET; + + /* let pending msg_connect be processed before we delete fwtcp */ + proxy_lwip_post(&fwtcp->msg_delete); +} + + +struct fwtcp * +fwtcp_create(struct fwspec *fwspec) +{ + struct fwtcp *fwtcp; + SOCKET lsock; + int status; + err_t error; + + lsock = proxy_bound_socket(fwspec->sdom, fwspec->stype, &fwspec->src.sa); + if (lsock == INVALID_SOCKET) { + return NULL; + } + + fwtcp = (struct fwtcp *)malloc(sizeof(*fwtcp)); + if (fwtcp == NULL) { + closesocket(lsock); + return NULL; + } + + fwtcp->pmhdl.callback = fwtcp_pmgr_listen; + fwtcp->pmhdl.data = (void *)fwtcp; + fwtcp->pmhdl.slot = -1; + + fwtcp->sock = lsock; + fwtcp->fwspec = *fwspec; /* struct copy */ + + error = sys_mbox_new(&fwtcp->connmbox, 16); + if (error != ERR_OK) { + closesocket(lsock); + free(fwtcp); + return (NULL); + } + +#define CALLBACK_MSG(MSG, FUNC) \ + do { \ + fwtcp->MSG.type = TCPIP_MSG_CALLBACK_STATIC; \ + fwtcp->MSG.sem = NULL; \ + fwtcp->MSG.msg.cb.function = FUNC; \ + fwtcp->MSG.msg.cb.ctx = (void *)fwtcp; \ + } while (0) + + CALLBACK_MSG(msg_connect, fwtcp_pcb_connect); + CALLBACK_MSG(msg_delete, fwtcp_pcb_delete); + +#undef CALLBACK_MSG + + status = pollmgr_add(&fwtcp->pmhdl, fwtcp->sock, POLLIN); + if (status < 0) { + sys_mbox_free(&fwtcp->connmbox); + closesocket(lsock); + free(fwtcp); + return NULL; + } + + fwtcp->next = fwtcp_list; + fwtcp_list = fwtcp; + + return fwtcp; +} + + +int +fwtcp_pmgr_listen(struct pollmgr_handler *handler, SOCKET fd, int revents) +{ + struct fwtcp *fwtcp; + struct sockaddr_storage ss; + socklen_t sslen; + struct pxtcp *pxtcp; + SOCKET newsock; + int status; + err_t error; + + fwtcp = (struct fwtcp *)handler->data; + pxtcp = NULL; + + LWIP_ASSERT1(fwtcp != NULL); + LWIP_ASSERT1(fd == fwtcp->sock); + LWIP_ASSERT1(revents == POLLIN); + LWIP_UNUSED_ARG(fd); + LWIP_UNUSED_ARG(revents); + + LWIP_ASSERT1(sys_mbox_valid(&fwtcp->connmbox)); + + sslen = sizeof(ss); + newsock = accept(fwtcp->sock, (struct sockaddr *)&ss, &sslen); + if (newsock == INVALID_SOCKET) { + return POLLIN; + } + +#ifdef RT_OS_LINUX + status = proxy_fixup_accepted_socket(newsock); + if (status < 0) { + proxy_reset_socket(newsock); + return POLLIN; + } +#endif + + if (ss.ss_family == PF_INET) { + struct sockaddr_in *peer4 = (struct sockaddr_in *)&ss; + RT_NOREF(peer4); + DPRINTF(("<--- TCP %RTnaipv4:%d\n", + peer4->sin_addr.s_addr, ntohs(peer4->sin_port))); + } + else { /* PF_INET6 */ + struct sockaddr_in6 *peer6 = (struct sockaddr_in6 *)&ss; + RT_NOREF(peer6); + DPRINTF(("<--- TCP %RTnaipv6:%d\n", + &peer6->sin6_addr, ntohs(peer6->sin6_port))); + } + + pxtcp = pxtcp_create_forwarded(newsock); + if (pxtcp == NULL) { + proxy_reset_socket(newsock); + return POLLIN; + } + + status = pxtcp_pmgr_add(pxtcp); + if (status < 0) { + pxtcp_cancel_forwarded(pxtcp); + return POLLIN; + } + + error = sys_mbox_trypost(&fwtcp->connmbox, (void *)pxtcp); + if (error != ERR_OK) { + pxtcp_pmgr_del(pxtcp); + pxtcp_cancel_forwarded(pxtcp); + return POLLIN; + } + + proxy_lwip_post(&fwtcp->msg_connect); + return POLLIN; +} + + +void +fwtcp_pcb_connect(void *arg) +{ + struct fwtcp *fwtcp = (struct fwtcp *)arg; + struct pxtcp *pxtcp; + u32_t timo; + + if (!sys_mbox_valid(&fwtcp->connmbox)) { + return; + } + + pxtcp = NULL; + timo = sys_mbox_tryfetch(&fwtcp->connmbox, (void **)&pxtcp); + if (timo == SYS_MBOX_EMPTY) { + return; + } + + LWIP_ASSERT1(pxtcp != NULL); + + /* hand off to pxtcp */ + pxtcp_pcb_connect(pxtcp, &fwtcp->fwspec); +} + + +static void +fwtcp_pcb_delete(void *arg) +{ + struct fwtcp *fwtcp = (struct fwtcp *)arg; + void *data; + u32_t timo; + + timo = sys_mbox_tryfetch(&fwtcp->connmbox, &data); + LWIP_ASSERT1(timo == SYS_MBOX_EMPTY); + LWIP_UNUSED_ARG(timo); /* only in assert */ + + sys_mbox_free(&fwtcp->connmbox); + free(fwtcp); +} diff --git a/src/VBox/NetworkServices/NAT/fwudp.c b/src/VBox/NetworkServices/NAT/fwudp.c new file mode 100644 index 00000000..7c0b69f9 --- /dev/null +++ b/src/VBox/NetworkServices/NAT/fwudp.c @@ -0,0 +1,555 @@ +/* $Id: fwudp.c $ */ +/** @file + * NAT Network - UDP port-forwarding. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#define LOG_GROUP LOG_GROUP_NAT_SERVICE + +#include "winutils.h" +#include "proxy.h" +#include "proxy_pollmgr.h" +#include "portfwd.h" +#include "pxremap.h" + +#ifndef RT_OS_WINDOWS +#include <sys/types.h> +#include <sys/socket.h> +#include <stdio.h> +#include <string.h> +#include <poll.h> + +#include <err.h> /* BSD'ism */ +#else +#include <stdio.h> +#include <string.h> +#include "winpoll.h" +#endif + +#include "lwip/opt.h" +#include "lwip/memp.h" /* XXX: for bulk delete of pcbs */ + +#include "lwip/sys.h" +#include "lwip/tcpip.h" +#include "lwip/udp.h" + +struct fwudp_dgram { + struct pbuf *p; + ipX_addr_t src_addr; + u16_t src_port; +}; + +/** + * UDP port-forwarding. + * + * Unlike pxudp that uses 1:1 mapping between pcb and socket, for + * port-forwarded UDP the setup is bit more elaborated. + * + * For fwtcp things are simple since incoming TCP connection get a new + * socket that we just hand off to pxtcp. Thus fwtcp only handles + * connection initiation. + * + * For fwudp all proxied UDP conversations share the same socket, so + * single fwudp multiplexes to several UDP pcbs. + * + * XXX: TODO: Currently pcbs point back directly to fwudp. It might + * make sense to introduce a per-pcb structure that points to fwudp + * and carries additional information, like pre-mapped peer address. + */ +struct fwudp { + /** + * Our poll manager handler. + */ + struct pollmgr_handler pmhdl; + + /** + * Forwarding specification. + */ + struct fwspec fwspec; + + /** + * XXX: lwip-format copy of destination + */ + ipX_addr_t dst_addr; + u16_t dst_port; + + /** + * Listening socket. + */ + SOCKET sock; + + /** + * Ring-buffer for inbound datagrams. + */ + struct { + struct fwudp_dgram *buf; + size_t bufsize; + volatile size_t vacant; + volatile size_t unsent; + } inbuf; + + struct tcpip_msg msg_send; + struct tcpip_msg msg_delete; + + struct fwudp *next; +}; + + +struct fwudp *fwudp_create(struct fwspec *); + +/* poll manager callback for fwudp socket */ +static int fwudp_pmgr_pump(struct pollmgr_handler *, SOCKET, int); + +/* lwip thread callbacks called via proxy_lwip_post() */ +static void fwudp_pcb_send(void *); +static void fwudp_pcb_delete(void *); + +static void fwudp_pcb_recv(void *, struct udp_pcb *, struct pbuf *, ip_addr_t *, u16_t); +static void fwudp_pcb_forward_outbound(struct fwudp *, struct udp_pcb *, struct pbuf *); + + +/** + * Linked list of active fwtcp forwarders. + */ +struct fwudp *fwudp_list = NULL; + + +void +fwudp_init(void) +{ + return; +} + + +void +fwudp_add(struct fwspec *fwspec) +{ + struct fwudp *fwudp; + + fwudp = fwudp_create(fwspec); + if (fwudp == NULL) { + DPRINTF0(("%s: failed to add rule for UDP ...\n", __func__)); + return; + } + + DPRINTF0(("%s\n", __func__)); + /* fwudp_create has put fwudp on the linked list */ +} + + +void +fwudp_del(struct fwspec *fwspec) +{ + struct fwudp *fwudp; + struct fwudp **pprev; + + for (pprev = &fwudp_list; (fwudp = *pprev) != NULL; pprev = &fwudp->next) { + if (fwspec_equal(&fwudp->fwspec, fwspec)) { + *pprev = fwudp->next; + fwudp->next = NULL; + break; + } + } + + if (fwudp == NULL) { + DPRINTF0(("%s: not found\n", __func__)); + return; + } + + DPRINTF0(("%s\n", __func__)); + + pollmgr_del_slot(fwudp->pmhdl.slot); + fwudp->pmhdl.slot = -1; + + /* let pending msg_send be processed before we delete fwudp */ + proxy_lwip_post(&fwudp->msg_delete); +} + + +struct fwudp * +fwudp_create(struct fwspec *fwspec) +{ + struct fwudp *fwudp; + SOCKET sock; + int status; + + sock = proxy_bound_socket(fwspec->sdom, fwspec->stype, &fwspec->src.sa); + if (sock == INVALID_SOCKET) { + return NULL; + } + + fwudp = (struct fwudp *)malloc(sizeof(*fwudp)); + if (fwudp == NULL) { + closesocket(sock); + return NULL; + } + + fwudp->pmhdl.callback = fwudp_pmgr_pump; + fwudp->pmhdl.data = (void *)fwudp; + fwudp->pmhdl.slot = -1; + + fwudp->sock = sock; + fwudp->fwspec = *fwspec; /* struct copy */ + + /* XXX */ + if (fwspec->sdom == PF_INET) { + struct sockaddr_in *dst4 = &fwspec->dst.sin; + memcpy(&fwudp->dst_addr.ip4, &dst4->sin_addr, sizeof(ip_addr_t)); + fwudp->dst_port = htons(dst4->sin_port); + } + else { /* PF_INET6 */ + struct sockaddr_in6 *dst6 = &fwspec->dst.sin6; + memcpy(&fwudp->dst_addr.ip6, &dst6->sin6_addr, sizeof(ip6_addr_t)); + fwudp->dst_port = htons(dst6->sin6_port); + } + + fwudp->inbuf.bufsize = 256; /* elements */ + fwudp->inbuf.buf + = (struct fwudp_dgram *)calloc(fwudp->inbuf.bufsize, + sizeof(struct fwudp_dgram)); + if (fwudp->inbuf.buf == NULL) { + closesocket(sock); + free(fwudp); + return (NULL); + } + fwudp->inbuf.vacant = 0; + fwudp->inbuf.unsent = 0; + +#define CALLBACK_MSG(MSG, FUNC) \ + do { \ + fwudp->MSG.type = TCPIP_MSG_CALLBACK_STATIC; \ + fwudp->MSG.sem = NULL; \ + fwudp->MSG.msg.cb.function = FUNC; \ + fwudp->MSG.msg.cb.ctx = (void *)fwudp; \ + } while (0) + + CALLBACK_MSG(msg_send, fwudp_pcb_send); + CALLBACK_MSG(msg_delete, fwudp_pcb_delete); + +#undef CALLBACK_MSG + + status = pollmgr_add(&fwudp->pmhdl, fwudp->sock, POLLIN); + if (status < 0) { + closesocket(sock); + free(fwudp->inbuf.buf); + free(fwudp); + return NULL; + } + + fwudp->next = fwudp_list; + fwudp_list = fwudp; + + return fwudp; +} + + +/** + * Poll manager callaback for fwudp::sock + */ +int +fwudp_pmgr_pump(struct pollmgr_handler *handler, SOCKET fd, int revents) +{ + struct fwudp *fwudp; + struct sockaddr_storage ss; + socklen_t sslen = sizeof(ss); + size_t beg, lim; + struct fwudp_dgram *dgram; + struct pbuf *p; + ssize_t nread; + int status; + err_t error; + + fwudp = (struct fwudp *)handler->data; + + LWIP_ASSERT1(fwudp != NULL); + LWIP_ASSERT1(fd == fwudp->sock); + LWIP_ASSERT1(revents == POLLIN); + LWIP_UNUSED_ARG(fd); + LWIP_UNUSED_ARG(revents); + +#ifdef RT_OS_WINDOWS + nread = recvfrom(fwudp->sock, (char *)pollmgr_udpbuf, sizeof(pollmgr_udpbuf), 0, + (struct sockaddr *)&ss, &sslen); +#else + nread = recvfrom(fwudp->sock, pollmgr_udpbuf, sizeof(pollmgr_udpbuf), 0, + (struct sockaddr *)&ss, &sslen); +#endif + if (nread < 0) { + DPRINTF(("%s: %R[sockerr]\n", __func__, SOCKERRNO())); + return POLLIN; + } + + /* Check that ring buffer is not full */ + lim = fwudp->inbuf.unsent; + if (lim == 0) { + lim = fwudp->inbuf.bufsize - 1; /* guard slot at the end */ + } + else { + --lim; + } + + beg = fwudp->inbuf.vacant; + if (beg == lim) { /* no vacant slot */ + return POLLIN; + } + + + dgram = &fwudp->inbuf.buf[beg]; + + + status = fwany_ipX_addr_set_src(&dgram->src_addr, (struct sockaddr *)&ss); + if (status == PXREMAP_FAILED) { + return POLLIN; + } + + if (ss.ss_family == AF_INET) { + const struct sockaddr_in *peer4 = (const struct sockaddr_in *)&ss; + dgram->src_port = htons(peer4->sin_port); + } + else { /* PF_INET6 */ + const struct sockaddr_in6 *peer6 = (const struct sockaddr_in6 *)&ss; + dgram->src_port = htons(peer6->sin6_port); + } + + p = pbuf_alloc(PBUF_RAW, nread, PBUF_RAM); + if (p == NULL) { + DPRINTF(("%s: pbuf_alloc(%d) failed\n", __func__, (int)nread)); + return POLLIN; + } + + error = pbuf_take(p, pollmgr_udpbuf, nread); + if (error != ERR_OK) { + DPRINTF(("%s: pbuf_take(%d) failed\n", __func__, (int)nread)); + pbuf_free(p); + return POLLIN; + } + + dgram->p = p; + + ++beg; + if (beg == fwudp->inbuf.bufsize) { + beg = 0; + } + fwudp->inbuf.vacant = beg; + + proxy_lwip_post(&fwudp->msg_send); + + return POLLIN; +} + + +/** + * Lwip thread callback invoked via fwudp::msg_send + */ +void +fwudp_pcb_send(void *arg) +{ + struct fwudp *fwudp = (struct fwudp *)arg; + struct fwudp_dgram dgram; + struct udp_pcb *pcb; + struct udp_pcb **pprev; + int isv6; + size_t idx; + + idx = fwudp->inbuf.unsent; + + if (idx == fwudp->inbuf.vacant) { + /* empty buffer - shouldn't happen! */ + DPRINTF(("%s: ring buffer empty!\n", __func__)); + return; + } + + dgram = fwudp->inbuf.buf[idx]; /* struct copy */ +#if 1 /* valgrind hint */ + fwudp->inbuf.buf[idx].p = NULL; +#endif + if (++idx == fwudp->inbuf.bufsize) { + idx = 0; + } + fwudp->inbuf.unsent = idx; + + /* XXX: this is *STUPID* */ + isv6 = (fwudp->fwspec.sdom == PF_INET6); + pprev = &udp_proxy_pcbs; + for (pcb = udp_proxy_pcbs; pcb != NULL; pcb = pcb->next) { + if (PCB_ISIPV6(pcb) == isv6 + && pcb->remote_port == fwudp->dst_port + && ipX_addr_cmp(isv6, &fwudp->dst_addr, &pcb->remote_ip) + && pcb->local_port == dgram.src_port + && ipX_addr_cmp(isv6, &dgram.src_addr, &pcb->local_ip)) + { + break; + } + else { + pprev = &pcb->next; + } + } + + if (pcb != NULL) { + *pprev = pcb->next; + pcb->next = udp_proxy_pcbs; + udp_proxy_pcbs = pcb; + + /* + * XXX: check that its ours and not accidentally created by + * outbound traffic. + * + * ???: Otherwise? Expire it and set pcb = NULL; to create a + * new one below? + */ + } + + if (pcb == NULL) { + pcb = udp_new(); + if (pcb == NULL) { + goto out; + } + + ip_set_v6(pcb, isv6); + + /* equivalent of udp_bind */ + ipX_addr_set(isv6, &pcb->local_ip, &dgram.src_addr); + pcb->local_port = dgram.src_port; + + /* equivalent to udp_connect */ + ipX_addr_set(isv6, &pcb->remote_ip, &fwudp->dst_addr); + pcb->remote_port = fwudp->dst_port; + pcb->flags |= UDP_FLAGS_CONNECTED; + + udp_recv(pcb, fwudp_pcb_recv, fwudp); + + pcb->next = udp_proxy_pcbs; + udp_proxy_pcbs = pcb; + udp_proxy_timer_needed(); + } + + udp_send(pcb, dgram.p); + + out: + pbuf_free(dgram.p); +} + + +/** + * udp_recv() callback. + */ +void +fwudp_pcb_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, + ip_addr_t *addr, u16_t port) +{ + struct fwudp *fwudp = (struct fwudp *)arg; + + LWIP_UNUSED_ARG(addr); + LWIP_UNUSED_ARG(port); + + LWIP_ASSERT1(fwudp != NULL); + + if (p == NULL) { + DPRINTF(("%s: pcb %p (fwudp %p); sock %d: expired\n", + __func__, (void *)pcb, (void *)fwudp, fwudp->sock)); + /* NB: fwudp is "global" and not deleted */ + /* XXX: TODO: delete local reference when we will keep one */ + udp_remove(pcb); + return; + } + else { + fwudp_pcb_forward_outbound(fwudp, pcb, p); + } +} + + +/* + * XXX: This is pxudp_pcb_forward_outbound modulo: + * - s/pxudp/fwudp/g + * - addr/port (unused in either) dropped + * - destination is specified since host socket is not connected + */ +static void +fwudp_pcb_forward_outbound(struct fwudp *fwudp, struct udp_pcb *pcb, + struct pbuf *p) +{ + union { + struct sockaddr_in sin; + struct sockaddr_in6 sin6; + } peer; + socklen_t namelen; + + memset(&peer, 0, sizeof(peer)); /* XXX: shut up valgrind */ + + if (fwudp->fwspec.sdom == PF_INET) { + peer.sin.sin_family = AF_INET; +#if HAVE_SA_LEN + peer.sin.sin_len = +#endif + namelen = sizeof(peer.sin); + pxremap_outbound_ip4((ip_addr_t *)&peer.sin.sin_addr, &pcb->local_ip.ip4); + peer.sin.sin_port = htons(pcb->local_port); + } + else { + peer.sin6.sin6_family = AF_INET6; +#if HAVE_SA_LEN + peer.sin6.sin6_len = +#endif + namelen = sizeof(peer.sin6); + + pxremap_outbound_ip6((ip6_addr_t *)&peer.sin6.sin6_addr, &pcb->local_ip.ip6); + peer.sin6.sin6_port = htons(pcb->local_port); + } + + proxy_sendto(fwudp->sock, p, &peer, namelen); + pbuf_free(p); +} + + +/** + * Lwip thread callback invoked via fwudp::msg_delete + */ +static void +fwudp_pcb_delete(void *arg) +{ + struct fwudp *fwudp = (struct fwudp *)arg; + struct udp_pcb *pcb; + struct udp_pcb **pprev; + + LWIP_ASSERT1(fwudp->inbuf.unsent == fwudp->inbuf.vacant); + + pprev = &udp_proxy_pcbs; + pcb = udp_proxy_pcbs; + while (pcb != NULL) { + if (pcb->recv_arg != fwudp) { + pprev = &pcb->next; + pcb = pcb->next; + } + else { + struct udp_pcb *dead = pcb; + pcb = pcb->next; + *pprev = pcb; + memp_free(MEMP_UDP_PCB, dead); + } + } + + closesocket(fwudp->sock); + free(fwudp->inbuf.buf); + free(fwudp); +} diff --git a/src/VBox/NetworkServices/NAT/getrawsock.c b/src/VBox/NetworkServices/NAT/getrawsock.c new file mode 100644 index 00000000..8b93ff6f --- /dev/null +++ b/src/VBox/NetworkServices/NAT/getrawsock.c @@ -0,0 +1,165 @@ +/* $Id: getrawsock.c $ */ +/** @file + * Obtain raw-sockets from a server when debugging unprivileged. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#include <sys/types.h> +#include <sys/socket.h> +#include <sys/un.h> +#include <netinet/in.h> +#include <errno.h> +#include <pwd.h> +#include <signal.h> +#include <stdio.h> +#include <string.h> +#include <unistd.h> + +/* XXX: this should be in a header, but isn't. naughty me. :( */ +int getrawsock(int type); + + +int +getrawsock(int type) +{ + struct sockaddr_un sux; /* because solaris */ + struct passwd *pw; + size_t pathlen; + int rawsock, server; + struct msghdr mh; + struct iovec iov[1]; + char buf[1]; + struct cmsghdr *cmh; + char cmsg[CMSG_SPACE(sizeof(int))]; + ssize_t nread, nsent; + int status; + + server = -1; + rawsock = -1; + + memset(&sux, 0, sizeof(sux)); + sux.sun_family = AF_UNIX; + + if (geteuid() == 0) { + return -1; + } + + if (type == AF_INET) { + buf[0] = '4'; + } + else if (type == AF_INET6) { + buf[0] = '6'; + } + else { + return -1; + } + + errno = 0; + pw = getpwuid(getuid()); + if (pw == NULL) { + perror("getpwuid"); + return -1; + } + + pathlen = snprintf(sux.sun_path, sizeof(sux.sun_path), + "/tmp/.vbox-%s-aux/mkrawsock", pw->pw_name); + if (pathlen > sizeof(sux.sun_path)) { + fprintf(stderr, "socket pathname truncated\n"); + return -1; + } + + server = socket(PF_UNIX, SOCK_STREAM, 0); + if (server < 0) { + perror("socket"); + return -1; + } + + status = connect(server, (struct sockaddr *)&sux, + (sizeof(sux) - sizeof(sux.sun_path) + + strlen(sux.sun_path) + 1)); + if (status < 0) { + perror(sux.sun_path); + goto out; + } + + nsent = send(server, buf, 1, 0); + if (nsent != 1) { + if (nsent < 0) { + perror("send"); + } + else { + fprintf(stderr, "failed to contact mkrawsock\n"); + } + goto out; + } + + buf[0] = '\0'; + + iov[0].iov_base = buf; + iov[0].iov_len = 1; + + memset(&mh, 0, sizeof(mh)); + mh.msg_iov = iov; + mh.msg_iovlen = 1; + mh.msg_control = cmsg; + mh.msg_controllen = sizeof(cmsg); + + nread = recvmsg(server, &mh, 0); + if (nread != 1) { + if (nread < 0) { + perror("recvmsg"); + } + else { + fprintf(stderr, "EOF from mkrawsock\n"); + } + goto out; + } + + if ((type == AF_INET && buf[0] != '4') + || (type == AF_INET6 && buf[0] != '6') + || mh.msg_controllen == 0) + { + goto out; + } + + for (cmh = CMSG_FIRSTHDR(&mh); cmh != NULL; cmh = CMSG_NXTHDR(&mh, cmh)) { + if ((cmh->cmsg_level == SOL_SOCKET) + && (cmh->cmsg_type == SCM_RIGHTS) + && (cmh->cmsg_len == CMSG_LEN(sizeof(rawsock)))) + { + rawsock = *((int *)CMSG_DATA(cmh)); + break; + } + } + + out: + if (server != -1) { + close(server); + } + if (rawsock != -1) { + printf("%s: got ICMPv%c socket %d\n", + __func__, type == AF_INET ? '4' : '6', rawsock); + } + return rawsock; +} diff --git a/src/VBox/NetworkServices/NAT/lwipopts.h b/src/VBox/NetworkServices/NAT/lwipopts.h new file mode 100644 index 00000000..e36b36e0 --- /dev/null +++ b/src/VBox/NetworkServices/NAT/lwipopts.h @@ -0,0 +1,215 @@ +/* $Id: lwipopts.h $ */ +/** @file + * NAT Network - lwIP configuration options. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#ifndef VBOX_INCLUDED_SRC_NAT_lwipopts_h +#define VBOX_INCLUDED_SRC_NAT_lwipopts_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#include <VBox/cdefs.h> /* For VBOX_STRICT. */ +#include <iprt/mem.h> +#include <iprt/alloca.h> /* This may include malloc.h (msc), which is something that has + * to be done before redefining any of the functions therein. */ +#include <iprt/rand.h> /* see LWIP_RAND() definition */ + +/* lwip/sockets.h assumes that if FD_SET is defined (in case of Innotek GCC + * its definition is dragged through iprt/types.h) then struct timeval is + * defined as well, but it's not the case. So include it manually. */ +#ifdef RT_OS_OS2 +# include <sys/time.h> +#endif + +/** Make lwIP use the libc malloc, or more precisely (see below) the IPRT + * memory allocation functions. */ +#define MEM_LIBC_MALLOC 1 + +/** Set proper memory alignment. */ +#if HC_ARCH_BITS == 64 +# define MEM_ALIGNMENT 8 +#else +#define MEM_ALIGNMENT 4 +#endif + +/* Padding before Ethernet header to make IP header aligned */ +#define ETH_PAD_SIZE 2 + +/* IP */ +#define IP_REASSEMBLY 1 +#define IP_REASS_MAX_PBUFS 128 + + + +/** Increase maximum TCP window size. */ +#define TCP_WND 32768 + +/** Increase TCP maximum segment size. */ +#define TCP_MSS 1460 + +/** Enable queueing of out-of-order segments. */ +#define TCP_QUEUE_OOSEQ 1 + +/** TCP sender buffer space (bytes). */ +#define TCP_SND_BUF (32 * TCP_MSS) + +/* TCP sender buffer space (pbufs). This must be at least = 2 * + TCP_SND_BUF/TCP_MSS for things to work. */ +#define TCP_SND_QUEUELEN 128 + +/* MEMP_NUM_PBUF: the number of memp struct pbufs. If the application + sends a lot of data out of ROM (or other static memory), this + should be set high. + + NB: This is for PBUF_ROM and PBUF_REF pbufs only! + + Number of PBUF_POOL pbufs is controlled by PBUF_POOL_SIZE that, + somewhat confusingly, breaks MEMP_NUM_* pattern. + + PBUF_RAM pbufs are allocated with mem_malloc (with MEM_LIBC_MALLOC + set to 1 this is just system malloc), not memp_malloc. */ +#define MEMP_NUM_PBUF (1024 * 4) + + +/* MEMP_NUM_MLD6_GROUP: Maximum number of IPv6 multicast groups that + can be joined. + + We need to be able to join solicited node multicast for each + address (potentially different) and two groups for DHCP6. All + routers multicast is hardcoded in ip6.c and does not require + explicit joining. Provide also for a few extra groups just in + case. */ +#define MEMP_NUM_MLD6_GROUP (LWIP_IPV6_NUM_ADDRESSES + /* dhcp6 */ 2 + /* extra */ 8) + + +/* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP + segments. */ +#define MEMP_NUM_TCP_SEG (MEMP_NUM_TCP_PCB * TCP_SND_QUEUELEN / 2) + +/* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP + connections. */ +#define MEMP_NUM_TCP_PCB 128 + +/* MEMP_NUM_TCPIP_MSG_*: the number of struct tcpip_msg, which is used + for sequential API communication and incoming packets. Used in + src/api/tcpip.c. */ +#define MEMP_NUM_TCPIP_MSG_API 128 +#define MEMP_NUM_TCPIP_MSG_INPKT 1024 + +/* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One + per active UDP "connection". */ +#define MEMP_NUM_UDP_PCB 32 + +/* Pbuf options */ +/* PBUF_POOL_SIZE: the number of buffers in the pbuf pool. + This is only for PBUF_POOL pbufs, primarily used by netif drivers. + + This should have been named with the MEMP_NUM_ prefix (cf. + MEMP_NUM_PBUF for PBUF_ROM and PBUF_REF) as it controls the size of + yet another memp_malloc() pool. */ +#define PBUF_POOL_SIZE (1024 * 4) + +/* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. + Use default that is based on TCP_MSS and PBUF_LINK_HLEN. */ +#undef PBUF_POOL_BUFSIZE + +/** Turn on support for lightweight critical region protection. Leaving this + * off uses synchronization code in pbuf.c which is totally polluted with + * races. All the other lwip source files would fall back to semaphore-based + * synchronization, but pbuf.c is just broken, leading to incorrect allocation + * and as a result to assertions due to buffers being double freed. */ +#define SYS_LIGHTWEIGHT_PROT 1 + +/** Attempt to get rid of htons etc. macro issues. */ +#undef LWIP_PREFIX_BYTEORDER_FUNCS + +#define LWIP_TCPIP_CORE_LOCKING_INPUT 0 +#define LWIP_TCPIP_CORE_LOCKING 0 +#define LWIP_TCP 1 +#define LWIP_SOCKET 0 +#define LWIP_ARP 1 +#define ARP_PROXY 1 +#define LWIP_ETHERNET 1 +#define LWIP_COMPAT_SOCKETS 0 +#define LWIP_COMPAT_MUTEX 1 + +#define LWIP_IPV6 1 +#define LWIP_IPV6_FORWARD 1 +#define LWIP_ND6_PROXY 1 + +#define LWIP_ND6_ALLOW_RA_UPDATES (!LWIP_IPV6_FORWARD) +#define LWIP_IPV6_SEND_ROUTER_SOLICIT (!LWIP_IPV6_FORWARD) +/* IPv6 autoconfig we don't need in proxy, but it required for very seldom cases + * iSCSI over intnet with IPv6 + */ +#define LWIP_IPV6_AUTOCONFIG 1 +#if LWIP_IPV6_FORWARD /* otherwise use the default from lwip/opt.h */ +#define LWIP_IPV6_DUP_DETECT_ATTEMPTS 0 +#endif + +#define LWIP_IPV6_FRAG 1 + +/** + * aka Slirp mode. + */ +#define LWIP_CONNECTION_PROXY 1 +#define IP_FORWARD 1 + +/* MEMP_NUM_SYS_TIMEOUT: the number of simultaneously active + timeouts. */ +#define MEMP_NUM_SYS_TIMEOUT 16 + + +/* this is required for IPv6 and IGMP needs */ +#define LWIP_RAND() RTRandU32() + +/* Debugging stuff. */ +#ifdef DEBUG +# define LWIP_DEBUG +# include "lwip-log.h" + +# define LWIP_PROXY_DEBUG LWIP_DBG_OFF +#endif /* DEBUG */ + +/* printf formatter definitions */ +#define U16_F "hu" +#define S16_F "hd" +#define X16_F "hx" +#define U32_F "u" +#define S32_F "d" +#define X32_F "x" + +/* Redirect libc memory alloc functions to IPRT. */ +#define malloc(x) RTMemAlloc(x) +#define realloc(x,y) RTMemRealloc((x), (y)) +#define free(x) RTMemFree(x) + +/* Align VBOX_STRICT and LWIP_NOASSERT. */ +#ifndef VBOX_STRICT +# define LWIP_NOASSERT 1 +#endif + +#endif /* !VBOX_INCLUDED_SRC_NAT_lwipopts_h */ diff --git a/src/VBox/NetworkServices/NAT/mkrawsock.c b/src/VBox/NetworkServices/NAT/mkrawsock.c new file mode 100644 index 00000000..50e9831f --- /dev/null +++ b/src/VBox/NetworkServices/NAT/mkrawsock.c @@ -0,0 +1,349 @@ +/* $Id: mkrawsock.c $ */ +/** @file + * Auxiliary server to create raw-sockets when debugging unprivileged. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#ifdef __linux__ +#define _GNU_SOURCE +#endif + +#ifdef __sun__ +#if __STDC_VERSION__ - 0 >= 199901L +#define _XOPEN_SOURCE 600 +#else +#define _XOPEN_SOURCE 500 +#endif +#define __EXTENSIONS__ 1 +#endif + +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/socket.h> +#include <sys/un.h> +#include <netinet/in.h> +#ifdef __linux__ +#include <linux/icmp.h> /* for ICMP_FILTER */ +#endif +#include <errno.h> +#include <fcntl.h> +#include <pwd.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + + +static void handler(int sig); +static void serve(int s); +static int mkrawsock(int family); + +volatile sig_atomic_t signaled = 0; + +int +main(int argc, char **argv) +{ + struct sigaction sa; + struct sockaddr_un sux; /* because solaris */ + struct passwd *pw; + size_t pathlen; + char *slash; + int s, client; + int status; + + memset(&sux, 0, sizeof(sux)); + sux.sun_family = AF_UNIX; + + if (getuid() == 0) { + if (argc != 2) { + fprintf(stderr, "username required when run as root\n"); + return EXIT_FAILURE; + } + + errno = 0; + pw = getpwnam(argv[1]); + if (pw == NULL) { + perror("getpwnam"); + return EXIT_FAILURE; + } + if (pw->pw_uid == 0) { + fprintf(stderr, "%s is superuser\n", pw->pw_name); + return EXIT_FAILURE; + } + } + else { + errno = 0; + pw = getpwuid(getuid()); + if (pw == NULL) { + perror("getpwuid"); + return EXIT_FAILURE; + } + } + + pathlen = snprintf(sux.sun_path, sizeof(sux.sun_path), + "/tmp/.vbox-%s-aux/mkrawsock", pw->pw_name); + if (pathlen > sizeof(sux.sun_path)) { + fprintf(stderr, "socket pathname truncated\n"); + return EXIT_FAILURE; + } + + slash = strrchr(sux.sun_path, '/'); + if (slash == NULL) { + fprintf(stderr, "%s: no directory separator\n", sux.sun_path); + return EXIT_FAILURE; + } + + *slash = '\0'; + + status = mkdir(sux.sun_path, 0700); + if (status == 0) { + status = chown(sux.sun_path, pw->pw_uid, pw->pw_gid); + if (status < 0) { + perror("chown"); + return EXIT_FAILURE; + } + } + else if (errno != EEXIST) { + perror("mkdir"); + return EXIT_FAILURE; + } + else { + int dirfd; + struct stat st; + + dirfd = open(sux.sun_path, O_RDONLY, O_DIRECTORY); + if (dirfd < 0) { + perror(sux.sun_path); + return EXIT_FAILURE; + } + + status = fstat(dirfd, &st); + close(dirfd); + + if (status < 0) { + perror(sux.sun_path); + return EXIT_FAILURE; + } + + if (st.st_uid != pw->pw_uid) { + fprintf(stderr, "%s: exists but not owned by %s\n", + sux.sun_path, pw->pw_name); + return EXIT_FAILURE; + } + + if ((st.st_mode & 0777) != 0700) { + fprintf(stderr, "%s: bad mode %04o\n", + sux.sun_path, (unsigned int)(st.st_mode & 0777)); + return EXIT_FAILURE; + } + } + + *slash = '/'; + +#if 0 + status = unlink(sux.sun_path); + if (status < 0 && errno != ENOENT) { + perror("unlink"); + } +#endif + + s = socket(PF_UNIX, SOCK_STREAM, 0); + if (s < 0) { + perror("socket"); + return EXIT_FAILURE; + } + + status = bind(s, (struct sockaddr *)&sux, + (sizeof(sux) - sizeof(sux.sun_path) + + strlen(sux.sun_path) + 1)); + if (status < 0) { + perror(sux.sun_path); + close(s); + return EXIT_FAILURE; + } + + status = chown(sux.sun_path, pw->pw_uid, pw->pw_gid); + if (status < 0) { + perror("chown"); + close(s); + return EXIT_FAILURE; + } + + status = chmod(sux.sun_path, 0600); + if (status < 0) { + perror("chmod"); + close(s); + return EXIT_FAILURE; + } + + status = listen(s, 1); + if (status < 0) { + perror("listen"); + close(s); + return EXIT_FAILURE; + } + + memset(&sa, 0, sizeof(sa)); + sa.sa_handler = handler; + sigemptyset(&sa.sa_mask); + + sigaction(SIGINT, &sa, NULL); + sigaction(SIGTERM, &sa, NULL); + + while (!signaled) { + client = accept(s, NULL, 0); + if (client < 0) { + perror("accept"); + continue; + } + + serve(client); + close(client); + } + + close(s); + status = unlink(sux.sun_path); + if (status < 0) { + perror("unlink"); + } + + return EXIT_SUCCESS; +} + + +static void +handler(int sig) +{ + signaled = 1; +} + + +static void +serve(int client) +{ +#ifdef SO_PEERCRED + struct ucred cr; + socklen_t crlen; +#endif + ssize_t nread, nsent; + struct msghdr mh; + struct iovec iov[1]; + char buf[1]; + struct cmsghdr *cmh; + char cmsg[CMSG_SPACE(sizeof(int))]; + int fd; + int status; + +#ifdef SO_PEERCRED + crlen = sizeof(cr); + status = getsockopt(client, SOL_SOCKET, SO_PEERCRED, &cr, &crlen); + if (status < 0) { + perror("SO_PEERCRED"); + return; + } + + fprintf(stderr, "request from pid %lu uid %lu ", + (unsigned long)cr.pid, (unsigned long)cr.uid); +#endif + + nread = read(client, buf, 1); + if (nread < 0) { + perror("recv"); + return; + } + + fd = -1; + switch (buf[0]) { + + case '4': + fprintf(stderr, "for ICMPv4 socket\n"); + fd = mkrawsock(PF_INET); + break; + + case '6': + fprintf(stderr, "for ICMPv6 socket\n"); + fd = mkrawsock(PF_INET6); + break; + + default: + fprintf(stderr, "bad request 0x%02x\n", (unsigned int)buf[0]); + return; + } + + if (fd < 0) { + buf[0] = '\0'; /* NAK */ + nsent = write(client, buf, 1); + (void)nsent; + return; + } + + memset(&mh, 0, sizeof(mh)); + memset(cmsg, 0, sizeof(cmsg)); + + iov[0].iov_base = buf; + iov[0].iov_len = 1; + + mh.msg_iov = iov; + mh.msg_iovlen = 1; + mh.msg_control = cmsg; + mh.msg_controllen = sizeof(cmsg); + + cmh = CMSG_FIRSTHDR(&mh); + cmh->cmsg_level = SOL_SOCKET; + cmh->cmsg_type = SCM_RIGHTS; + cmh->cmsg_len = CMSG_LEN(sizeof(fd)); + *((int *) CMSG_DATA(cmh)) = fd; + + nsent = sendmsg(client, &mh, 0); + if (nsent < 0) { + perror("sendmsg"); + } + + close(fd); +} + + +static int +mkrawsock(int family) +{ + int fd; + + if (family == PF_INET) { + fd = socket(PF_INET, SOCK_RAW, IPPROTO_ICMP); + if (fd < 0) { + perror("IPPROTO_ICMP"); + return -1; + } + } + else { + fd = socket(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6); + if (fd < 0) { + perror("IPPROTO_ICMPV6"); + return -1; + } + } + + return fd; +} diff --git a/src/VBox/NetworkServices/NAT/portfwd.c b/src/VBox/NetworkServices/NAT/portfwd.c new file mode 100644 index 00000000..9e859944 --- /dev/null +++ b/src/VBox/NetworkServices/NAT/portfwd.c @@ -0,0 +1,273 @@ +/* $Id: portfwd.c $ */ +/** @file + * NAT Network - port-forwarding rules. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#define LOG_GROUP LOG_GROUP_NAT_SERVICE + +#include "winutils.h" +#include "portfwd.h" + +#ifndef RT_OS_WINDOWS +#include <arpa/inet.h> +#include <netdb.h> +#include <poll.h> +#else +# include "winpoll.h" +#endif +#include <stdio.h> +#include <string.h> + +#include "proxy.h" +#include "proxy_pollmgr.h" +#include "pxremap.h" + +#include "lwip/netif.h" + + +struct portfwd_msg { + struct fwspec *fwspec; + int add; +}; + + +static int portfwd_chan_send(struct portfwd_msg *); +static int portfwd_rule_add_del(struct fwspec *, int); +static int portfwd_pmgr_chan(struct pollmgr_handler *, SOCKET, int); + + +static struct pollmgr_handler portfwd_pmgr_chan_hdl; + + +void +portfwd_init(void) +{ + portfwd_pmgr_chan_hdl.callback = portfwd_pmgr_chan; + portfwd_pmgr_chan_hdl.data = NULL; + portfwd_pmgr_chan_hdl.slot = -1; + pollmgr_add_chan(POLLMGR_CHAN_PORTFWD, &portfwd_pmgr_chan_hdl); + + /* add preconfigured forwarders */ + fwtcp_init(); + fwudp_init(); +} + + +static int +portfwd_chan_send(struct portfwd_msg *msg) +{ + ssize_t nsent; + + nsent = pollmgr_chan_send(POLLMGR_CHAN_PORTFWD, &msg, sizeof(msg)); + if (nsent < 0) { + free(msg); + return -1; + } + + return 0; +} + + +static int +portfwd_rule_add_del(struct fwspec *fwspec, int add) +{ + struct portfwd_msg *msg; + + msg = (struct portfwd_msg *)malloc(sizeof(*msg)); + if (msg == NULL) { + DPRINTF0(("%s: failed to allocate message\n", __func__)); + return -1; + } + + msg->fwspec = fwspec; + msg->add = add; + + return portfwd_chan_send(msg); +} + + +int +portfwd_rule_add(struct fwspec *fwspec) +{ + return portfwd_rule_add_del(fwspec, 1); +} + + +int +portfwd_rule_del(struct fwspec *fwspec) +{ + return portfwd_rule_add_del(fwspec, 0); +} + + +/** + * POLLMGR_CHAN_PORTFWD handler. + */ +static int +portfwd_pmgr_chan(struct pollmgr_handler *handler, SOCKET fd, int revents) +{ + void *ptr = pollmgr_chan_recv_ptr(handler, fd, revents); + struct portfwd_msg *msg = (struct portfwd_msg *)ptr; + + if (msg->fwspec->stype == SOCK_STREAM) { + if (msg->add) { + fwtcp_add(msg->fwspec); + } + else { + fwtcp_del(msg->fwspec); + } + } + else { /* SOCK_DGRAM */ + if (msg->add) { + fwudp_add(msg->fwspec); + } + else { + fwudp_del(msg->fwspec); + } + } + + free(msg->fwspec); + free(msg); + + return POLLIN; +} + + +int +fwspec_set(struct fwspec *fwspec, int sdom, int stype, + const char *src_addr_str, uint16_t src_port, + const char *dst_addr_str, uint16_t dst_port) +{ + struct addrinfo hints; + struct addrinfo *ai; + int status; + + LWIP_ASSERT1(sdom == PF_INET || sdom == PF_INET6); + LWIP_ASSERT1(stype == SOCK_STREAM || stype == SOCK_DGRAM); + + fwspec->sdom = sdom; + fwspec->stype = stype; + + memset(&hints, 0, sizeof(hints)); + hints.ai_family = (sdom == PF_INET) ? AF_INET : AF_INET6; + hints.ai_socktype = stype; + hints.ai_flags = AI_NUMERICHOST; + + status = getaddrinfo(src_addr_str, NULL, &hints, &ai); + if (status != 0) { + LogRel(("\"%s\": %s\n", src_addr_str, gai_strerror(status))); + return -1; + } + LWIP_ASSERT1(ai != NULL); + LWIP_ASSERT1(ai->ai_addrlen <= sizeof(fwspec->src)); + memcpy(&fwspec->src, ai->ai_addr, ai->ai_addrlen); + freeaddrinfo(ai); + ai = NULL; + + status = getaddrinfo(dst_addr_str, NULL, &hints, &ai); + if (status != 0) { + LogRel(("\"%s\": %s\n", dst_addr_str, gai_strerror(status))); + return -1; + } + LWIP_ASSERT1(ai != NULL); + LWIP_ASSERT1(ai->ai_addrlen <= sizeof(fwspec->dst)); + memcpy(&fwspec->dst, ai->ai_addr, ai->ai_addrlen); + freeaddrinfo(ai); + ai = NULL; + + if (sdom == PF_INET) { + fwspec->src.sin.sin_port = htons(src_port); + fwspec->dst.sin.sin_port = htons(dst_port); + } + else { /* PF_INET6 */ + fwspec->src.sin6.sin6_port = htons(src_port); + fwspec->dst.sin6.sin6_port = htons(dst_port); + } + + return 0; +} + + +int +fwspec_equal(struct fwspec *a, struct fwspec *b) +{ + LWIP_ASSERT1(a != NULL); + LWIP_ASSERT1(b != NULL); + + if (a->sdom != b->sdom || a->stype != b->stype) { + return 0; + } + + if (a->sdom == PF_INET) { + return a->src.sin.sin_port == b->src.sin.sin_port + && a->dst.sin.sin_port == b->dst.sin.sin_port + && a->src.sin.sin_addr.s_addr == b->src.sin.sin_addr.s_addr + && a->dst.sin.sin_addr.s_addr == b->dst.sin.sin_addr.s_addr; + } + else { /* PF_INET6 */ + return a->src.sin6.sin6_port == b->src.sin6.sin6_port + && a->dst.sin6.sin6_port == b->dst.sin6.sin6_port + && IN6_ARE_ADDR_EQUAL(&a->src.sin6.sin6_addr, &b->src.sin6.sin6_addr) + && IN6_ARE_ADDR_EQUAL(&a->dst.sin6.sin6_addr, &b->dst.sin6.sin6_addr); + } +} + + +/** + * Set fwdsrc to the IP address of the peer. + * + * For port-forwarded connections originating from hosts loopback the + * source address is set to the address of one of lwIP interfaces. + * + * Currently we only have one interface so there's not much logic + * here. In the future we might need to additionally consult fwspec + * and routing table to determine which netif is used for connections + * to the specified guest. + */ +int +fwany_ipX_addr_set_src(ipX_addr_t *fwdsrc, const struct sockaddr *peer) +{ + int mapping; + + if (peer->sa_family == AF_INET) { + const struct sockaddr_in *peer4 = (const struct sockaddr_in *)peer; + ip_addr_t peerip4; + + peerip4.addr = peer4->sin_addr.s_addr; + mapping = pxremap_inbound_ip4(&fwdsrc->ip4, &peerip4); + } + else if (peer->sa_family == AF_INET6) { + const struct sockaddr_in6 *peer6 = (const struct sockaddr_in6 *)peer; + ip6_addr_t peerip6; + + memcpy(&peerip6, &peer6->sin6_addr, sizeof(ip6_addr_t)); + mapping = pxremap_inbound_ip6(&fwdsrc->ip6, &peerip6); + } + else { + mapping = PXREMAP_FAILED; + } + + return mapping; +} diff --git a/src/VBox/NetworkServices/NAT/portfwd.h b/src/VBox/NetworkServices/NAT/portfwd.h new file mode 100644 index 00000000..47c3f817 --- /dev/null +++ b/src/VBox/NetworkServices/NAT/portfwd.h @@ -0,0 +1,84 @@ +/* $Id: portfwd.h $ */ +/** @file + * NAT Network - port-forwarding rules, definitions and declarations. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#ifndef VBOX_INCLUDED_SRC_NAT_portfwd_h +#define VBOX_INCLUDED_SRC_NAT_portfwd_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#ifndef RT_OS_WINDOWS +#include <sys/types.h> +#include <sys/socket.h> +#include <netinet/in.h> +#endif + +#include "lwip/ip_addr.h" + + +struct fwspec { + int sdom; /* PF_INET, PF_INET6 */ + int stype; /* SOCK_STREAM, SOCK_DGRAM */ + + /* listen on */ + union { + struct sockaddr sa; + struct sockaddr_in sin; /* sdom == PF_INET */ + struct sockaddr_in6 sin6; /* sdom == PF_INET6 */ + } src; + + /* forward to */ + union { + struct sockaddr sa; + struct sockaddr_in sin; /* sdom == PF_INET */ + struct sockaddr_in6 sin6; /* sdom == PF_INET6 */ + } dst; +}; + + +void portfwd_init(void); +int portfwd_rule_add(struct fwspec *); +int portfwd_rule_del(struct fwspec *); + + +int fwspec_set(struct fwspec *, int, int, + const char *, uint16_t, + const char *, uint16_t); + +int fwspec_equal(struct fwspec *, struct fwspec *); + +void fwtcp_init(void); +void fwudp_init(void); + +void fwtcp_add(struct fwspec *); +void fwtcp_del(struct fwspec *); +void fwudp_add(struct fwspec *); +void fwudp_del(struct fwspec *); + +int fwany_ipX_addr_set_src(ipX_addr_t *, const struct sockaddr *); + +#endif /* !VBOX_INCLUDED_SRC_NAT_portfwd_h */ diff --git a/src/VBox/NetworkServices/NAT/proxy.c b/src/VBox/NetworkServices/NAT/proxy.c new file mode 100644 index 00000000..900eaf25 --- /dev/null +++ b/src/VBox/NetworkServices/NAT/proxy.c @@ -0,0 +1,746 @@ +/* $Id: proxy.c $ */ +/** @file + * NAT Network - proxy setup and utilities. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#define LOG_GROUP LOG_GROUP_NAT_SERVICE + +#include "winutils.h" + +#include "proxy.h" +#include "proxy_pollmgr.h" +#include "portfwd.h" + +#include "lwip/opt.h" + +#include "lwip/sys.h" +#include "lwip/tcpip.h" + +#ifndef RT_OS_WINDOWS +#include <sys/poll.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <netinet/tcp.h> +#include <arpa/inet.h> +#include <fcntl.h> +#include <stdio.h> +#include <iprt/string.h> +#include <unistd.h> +#include <err.h> +#else +# include <iprt/string.h> +#endif + +#if defined(SOCK_NONBLOCK) && defined(RT_OS_NETBSD) /* XXX: PR kern/47569 */ +# undef SOCK_NONBLOCK +#endif + +#ifndef __arraycount +# define __arraycount(a) (sizeof(a)/sizeof(a[0])) +#endif + +static FNRTSTRFORMATTYPE proxy_sockerr_rtstrfmt; + +static SOCKET proxy_create_socket(int, int); + +volatile struct proxy_options *g_proxy_options; +static sys_thread_t pollmgr_tid; + +/* XXX: for mapping loopbacks to addresses in our network (ip4) */ +struct netif *g_proxy_netif; + + +/* + * Called on the lwip thread (aka tcpip thread) from tcpip_init() via + * its "tcpip_init_done" callback. Raw API is ok to use here + * (e.g. rtadvd), but netconn API is not. + */ +void +proxy_init(struct netif *proxy_netif, struct proxy_options *opts) +{ + int status; + + LWIP_ASSERT1(opts != NULL); + LWIP_UNUSED_ARG(proxy_netif); + + status = RTStrFormatTypeRegister("sockerr", proxy_sockerr_rtstrfmt, NULL); + AssertRC(status); + + g_proxy_options = opts; + g_proxy_netif = proxy_netif; + +#if 1 + proxy_rtadvd_start(proxy_netif); +#endif + + /* + * XXX: We use stateless DHCPv6 only to report IPv6 address(es) of + * nameserver(s). Since we don't yet support IPv6 addresses in + * HostDnsService, there's no point in running DHCPv6. + */ +#if 0 + dhcp6ds_init(proxy_netif); +#endif + + if (opts->tftp_root != NULL) { + tftpd_init(proxy_netif, opts->tftp_root); + } + + status = pollmgr_init(); + if (status < 0) { + errx(EXIT_FAILURE, "failed to initialize poll manager"); + /* NOTREACHED */ + } + + pxtcp_init(); + pxudp_init(); + + portfwd_init(); + + pxdns_init(proxy_netif); + + pxping_init(proxy_netif, opts->icmpsock4, opts->icmpsock6); + + pollmgr_tid = sys_thread_new("pollmgr_thread", + pollmgr_thread, NULL, + DEFAULT_THREAD_STACKSIZE, + DEFAULT_THREAD_PRIO); + if (!pollmgr_tid) { + errx(EXIT_FAILURE, "failed to create poll manager thread"); + /* NOTREACHED */ + } +} + + +#if !defined(RT_OS_WINDOWS) +/** + * Formatter for %R[sockerr] - unix strerror_r() version. + */ +static DECLCALLBACK(size_t) +proxy_sockerr_rtstrfmt(PFNRTSTROUTPUT pfnOutput, void *pvArgOutput, + const char *pszType, const void *pvValue, + int cchWidth, int cchPrecision, unsigned int fFlags, + void *pvUser) +{ + const int error = (int)(intptr_t)pvValue; + + const char *msg; + char buf[128]; + + NOREF(cchWidth); + NOREF(cchPrecision); + NOREF(fFlags); + NOREF(pvUser); + + AssertReturn(strcmp(pszType, "sockerr") == 0, 0); + + /* make sure return type mismatch is caught */ + buf[0] = '\0'; +#if defined(RT_OS_LINUX) && defined(_GNU_SOURCE) + msg = strerror_r(error, buf, sizeof(buf)); +#else + strerror_r(error, buf, sizeof(buf)); + msg = buf; +#endif + return RTStrFormat(pfnOutput, pvArgOutput, NULL, NULL, "%s", msg); +} + +#else /* RT_OS_WINDOWS */ + +/** + * Formatter for %R[sockerr] - windows FormatMessage() version. + */ +static DECLCALLBACK(size_t) +proxy_sockerr_rtstrfmt(PFNRTSTROUTPUT pfnOutput, void *pvArgOutput, + const char *pszType, const void *pvValue, + int cchWidth, int cchPrecision, unsigned int fFlags, + void *pvUser) +{ + const int error = (int)(intptr_t)pvValue; + size_t cb = 0; + + NOREF(cchWidth); + NOREF(cchPrecision); + NOREF(fFlags); + NOREF(pvUser); + + AssertReturn(strcmp(pszType, "sockerr") == 0, 0); + + /* + * XXX: Windows strerror() doesn't handle posix error codes, but + * since winsock uses its own, it shouldn't be much of a problem. + * If you see a strange error message, it's probably from + * FormatMessage() for an error from <WinError.h> that has the + * same numeric value. + */ + if (error < _sys_nerr) { + char buf[128] = ""; + int status; + + status = strerror_s(buf, sizeof(buf), error); + if (status == 0) { + if (strcmp(buf, "Unknown error") == 0) { + /* windows strerror() doesn't add the numeric value */ + cb += RTStrFormat(pfnOutput, pvArgOutput, NULL, NULL, + "Unknown error: %d", error); + } + else { + cb += RTStrFormat(pfnOutput, pvArgOutput, NULL, NULL, + "%s", buf); + } + } + else { + cb += RTStrFormat(pfnOutput, pvArgOutput, NULL, NULL, + "Unknown error: %d", error); + } + } + else { + DWORD nchars; + char *msg = NULL; + + nchars = FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM + | FORMAT_MESSAGE_ALLOCATE_BUFFER, + NULL, error, LANG_NEUTRAL, + (LPSTR)&msg, 0, + NULL); + if (nchars == 0 || msg == NULL) { + cb += RTStrFormat(pfnOutput, pvArgOutput, NULL, NULL, + "Unknown error: %d", error); + } + else { + /* FormatMessage() "helpfully" adds newline; get rid of it */ + char *crpos = strchr(msg, '\r'); + if (crpos != NULL) { + *crpos = '\0'; + } + + cb += RTStrFormat(pfnOutput, pvArgOutput, NULL, NULL, + "%s", msg); + } + + if (msg != NULL) { + LocalFree(msg); + } + } + + return cb; +} +#endif /* RT_OS_WINDOWS */ + + +/** + * Send static callback message from poll manager thread to lwip + * thread, scheduling a function call in lwip thread context. + * + * XXX: Existing lwip api only provides non-blocking version for this. + * It may fail when lwip thread is not running (mbox invalid) or if + * post failed (mbox full). How to handle these? + */ +void +proxy_lwip_post(struct tcpip_msg *msg) +{ + struct tcpip_callback_msg *m; + err_t error; + + LWIP_ASSERT1(msg != NULL); + + /* + * lwip plays games with fake incomplete struct tag to enforce API + */ + m = (struct tcpip_callback_msg *)msg; + error = tcpip_callbackmsg(m); + + if (error == ERR_VAL) { + /* XXX: lwip thread is not running (mbox invalid) */ + LWIP_ASSERT1(error != ERR_VAL); + } + + LWIP_ASSERT1(error == ERR_OK); +} + + +/** + * Create a non-blocking socket. Disable SIGPIPE for TCP sockets if + * possible. On Linux it's not possible and should be disabled for + * each send(2) individually. + */ +static SOCKET +proxy_create_socket(int sdom, int stype) +{ + SOCKET s; + int stype_and_flags; + int status; + + LWIP_UNUSED_ARG(status); /* depends on ifdefs */ + + + stype_and_flags = stype; + +#if defined(SOCK_NONBLOCK) + stype_and_flags |= SOCK_NONBLOCK; +#endif + + /* + * Disable SIGPIPE on disconnected socket. It might be easier to + * forgo it and just use MSG_NOSIGNAL on each send*(2), since we + * have to do it for Linux anyway, but Darwin does NOT have that + * flag (but has SO_NOSIGPIPE socket option). + */ +#if !defined(SOCK_NOSIGPIPE) && !defined(SO_NOSIGPIPE) && !defined(MSG_NOSIGNAL) +#if 0 /* XXX: Solaris has neither, the program should ignore SIGPIPE globally */ +#error Need a way to disable SIGPIPE on connection oriented sockets! +#endif +#endif + +#if defined(SOCK_NOSIGPIPE) + if (stype == SOCK_STREAM) { + stype_and_flags |= SOCK_NOSIGPIPE; + } +#endif + + s = socket(sdom, stype_and_flags, 0); + if (s == INVALID_SOCKET) { + DPRINTF(("socket: %R[sockerr]\n", SOCKERRNO())); + return INVALID_SOCKET; + } + +#if defined(RT_OS_WINDOWS) + { + u_long mode = 1; + status = ioctlsocket(s, FIONBIO, &mode); + if (status == SOCKET_ERROR) { + DPRINTF(("FIONBIO: %R[sockerr]\n", SOCKERRNO())); + closesocket(s); + return INVALID_SOCKET; + } + } +#elif !defined(SOCK_NONBLOCK) + { + int sflags; + + sflags = fcntl(s, F_GETFL, 0); + if (sflags < 0) { + DPRINTF(("F_GETFL: %R[sockerr]\n", SOCKERRNO())); + closesocket(s); + return INVALID_SOCKET; + } + + status = fcntl(s, F_SETFL, sflags | O_NONBLOCK); + if (status < 0) { + DPRINTF(("O_NONBLOCK: %R[sockerr]\n", SOCKERRNO())); + closesocket(s); + return INVALID_SOCKET; + } + } +#endif + +#if !defined(SOCK_NOSIGPIPE) && defined(SO_NOSIGPIPE) + if (stype == SOCK_STREAM) { + int on = 1; + const socklen_t onlen = sizeof(on); + + status = setsockopt(s, SOL_SOCKET, SO_NOSIGPIPE, &on, onlen); + if (status < 0) { + DPRINTF(("SO_NOSIGPIPE: %R[sockerr]\n", SOCKERRNO())); + closesocket(s); + return INVALID_SOCKET; + } + } +#endif + + /* + * Disable the Nagle algorithm. Otherwise the host may hold back + * packets that the guest wants to go out, causing potentially + * horrible performance. The guest is already applying the Nagle + * algorithm (or not) the way it wants. + */ + if (stype == SOCK_STREAM) { + int on = 1; + const socklen_t onlen = sizeof(on); + + status = setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (char *)&on, onlen); + if (status < 0) { + DPRINTF(("TCP_NODELAY: %R[sockerr]\n", SOCKERRNO())); + } + } + +#if defined(RT_OS_WINDOWS) + /* + * lwIP only holds one packet of "refused data" for us. Proxy + * relies on OS socket send buffer and doesn't do its own + * buffering. Unfortunately on Windows send buffer is very small + * (8K by default) and is not dynamically adpated by the OS it + * seems. So a single large write will fill it up and that will + * make lwIP drop segments, causing guest TCP into pathologic + * resend patterns. As a quick and dirty fix just bump it up. + */ + if (stype == SOCK_STREAM) { + int sndbuf; + socklen_t optlen = sizeof(sndbuf); + + status = getsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&sndbuf, &optlen); + if (status == 0) { + if (sndbuf < 64 * 1024) { + sndbuf = 64 * 1024; + status = setsockopt(s, SOL_SOCKET, SO_SNDBUF, + (char *)&sndbuf, optlen); + if (status != 0) { + DPRINTF(("SO_SNDBUF: setsockopt: %R[sockerr]\n", SOCKERRNO())); + } + } + } + else { + DPRINTF(("SO_SNDBUF: getsockopt: %R[sockerr]\n", SOCKERRNO())); + } + } +#endif + + return s; +} + + +#ifdef RT_OS_LINUX +/** + * Fixup a socket returned by accept(2). + * + * On Linux a socket returned by accept(2) does NOT inherit the socket + * options from the listening socket! We need to repeat parts of the + * song and dance we did above to make it non-blocking. + */ +int +proxy_fixup_accepted_socket(SOCKET s) +{ + int sflags; + int status; + + sflags = fcntl(s, F_GETFL, 0); + if (sflags < 0) { + DPRINTF(("F_GETFL: %R[sockerr]\n", SOCKERRNO())); + return -1; + } + + status = fcntl(s, F_SETFL, sflags | O_NONBLOCK); + if (status < 0) { + DPRINTF(("O_NONBLOCK: %R[sockerr]\n", SOCKERRNO())); + return -1; + } + + return 0; +} +#endif /* RT_OS_LINUX */ + + +/** + * Create a socket for outbound connection to dst_addr:dst_port. + * + * The socket is non-blocking and TCP sockets has SIGPIPE disabled if + * possible. On Linux it's not possible and should be disabled for + * each send(2) individually. + */ +SOCKET +proxy_connected_socket(int sdom, int stype, + ipX_addr_t *dst_addr, u16_t dst_port) +{ + struct sockaddr_in6 dst_sin6; + struct sockaddr_in dst_sin; + struct sockaddr *pdst_sa; + socklen_t dst_sa_len; + void *pdst_addr; + const struct sockaddr *psrc_sa; + socklen_t src_sa_len; + int status; + int sockerr; + SOCKET s; + + LWIP_ASSERT1(sdom == PF_INET || sdom == PF_INET6); + LWIP_ASSERT1(stype == SOCK_STREAM || stype == SOCK_DGRAM); + + DPRINTF(("---> %s ", stype == SOCK_STREAM ? "TCP" : "UDP")); + if (sdom == PF_INET6) { + pdst_sa = (struct sockaddr *)&dst_sin6; + pdst_addr = (void *)&dst_sin6.sin6_addr; + + memset(&dst_sin6, 0, sizeof(dst_sin6)); +#if HAVE_SA_LEN + dst_sin6.sin6_len = +#endif + dst_sa_len = sizeof(dst_sin6); + dst_sin6.sin6_family = AF_INET6; + memcpy(&dst_sin6.sin6_addr, &dst_addr->ip6, sizeof(ip6_addr_t)); + dst_sin6.sin6_port = htons(dst_port); + + DPRINTF(("[%RTnaipv6]:%d ", &dst_sin6.sin6_addr, dst_port)); + } + else { /* sdom = PF_INET */ + pdst_sa = (struct sockaddr *)&dst_sin; + pdst_addr = (void *)&dst_sin.sin_addr; + + memset(&dst_sin, 0, sizeof(dst_sin)); +#if HAVE_SA_LEN + dst_sin.sin_len = +#endif + dst_sa_len = sizeof(dst_sin); + dst_sin.sin_family = AF_INET; + dst_sin.sin_addr.s_addr = dst_addr->ip4.addr; /* byte-order? */ + dst_sin.sin_port = htons(dst_port); + + DPRINTF(("%RTnaipv4:%d ", dst_sin.sin_addr.s_addr, dst_port)); + } + + s = proxy_create_socket(sdom, stype); + if (s == INVALID_SOCKET) { + return INVALID_SOCKET; + } + DPRINTF(("socket %d\n", s)); + + /** @todo needs locking if dynamic modifyvm is allowed */ + if (sdom == PF_INET6) { + psrc_sa = (const struct sockaddr *)g_proxy_options->src6; + src_sa_len = sizeof(struct sockaddr_in6); + } + else { + psrc_sa = (const struct sockaddr *)g_proxy_options->src4; + src_sa_len = sizeof(struct sockaddr_in); + } + if (psrc_sa != NULL) { + status = bind(s, psrc_sa, src_sa_len); + if (status == SOCKET_ERROR) { + sockerr = SOCKERRNO(); + DPRINTF(("socket %d: bind: %R[sockerr]\n", s, sockerr)); + closesocket(s); + SET_SOCKERRNO(sockerr); + return INVALID_SOCKET; + } + } + + status = connect(s, pdst_sa, dst_sa_len); + if (status == SOCKET_ERROR +#if !defined(RT_OS_WINDOWS) + && SOCKERRNO() != EINPROGRESS +#else + && SOCKERRNO() != EWOULDBLOCK +#endif + ) + { + sockerr = SOCKERRNO(); + DPRINTF(("socket %d: connect: %R[sockerr]\n", s, sockerr)); + closesocket(s); + SET_SOCKERRNO(sockerr); + return INVALID_SOCKET; + } + + return s; +} + + +/** + * Create a socket for inbound (port-forwarded) connections to + * src_addr (port is part of sockaddr, so not a separate argument). + * + * The socket is non-blocking and TCP sockets has SIGPIPE disabled if + * possible. On Linux it's not possible and should be disabled for + * each send(2) individually. + * + * TODO?: Support v6-mapped v4 so that user can specify she wants + * "udp" and get both versions? + */ +SOCKET +proxy_bound_socket(int sdom, int stype, struct sockaddr *src_addr) +{ + SOCKET s; + int on; + const socklen_t onlen = sizeof(on); + int status; + int sockerr; + + s = proxy_create_socket(sdom, stype); + if (s == INVALID_SOCKET) { + return INVALID_SOCKET; + } + DPRINTF(("socket %d\n", s)); + + on = 1; + status = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&on, onlen); + if (status < 0) { /* not good, but not fatal */ + DPRINTF(("SO_REUSEADDR: %R[sockerr]\n", SOCKERRNO())); + } + + status = bind(s, src_addr, + sdom == PF_INET ? + sizeof(struct sockaddr_in) + : sizeof(struct sockaddr_in6)); + if (status == SOCKET_ERROR) { + sockerr = SOCKERRNO(); + DPRINTF(("bind: %R[sockerr]\n", sockerr)); + closesocket(s); + SET_SOCKERRNO(sockerr); + return INVALID_SOCKET; + } + + if (stype == SOCK_STREAM) { + status = listen(s, 5); + if (status == SOCKET_ERROR) { + sockerr = SOCKERRNO(); + DPRINTF(("listen: %R[sockerr]\n", sockerr)); + closesocket(s); + SET_SOCKERRNO(sockerr); + return INVALID_SOCKET; + } + } + + return s; +} + + +void +proxy_reset_socket(SOCKET s) +{ + struct linger linger; + + linger.l_onoff = 1; + linger.l_linger = 0; + + /* On Windows we can run into issue here, perhaps SO_LINGER isn't enough, and + * we should use WSA{Send,Recv}Disconnect instead. + * + * Links for the reference: + * http://msdn.microsoft.com/en-us/library/windows/desktop/ms738547%28v=vs.85%29.aspx + * http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4468997 + */ + setsockopt(s, SOL_SOCKET, SO_LINGER, (char *)&linger, sizeof(linger)); + + closesocket(s); +} + + +int +proxy_sendto(SOCKET sock, struct pbuf *p, void *name, size_t namelen) +{ + struct pbuf *q; + size_t i, clen; +#ifndef RT_OS_WINDOWS + struct msghdr mh; + ssize_t nsent; +#else + DWORD nsent; +#endif + int rc; + IOVEC fixiov[8]; /* fixed size (typical case) */ + const size_t fixiovsize = sizeof(fixiov)/sizeof(fixiov[0]); + IOVEC *dyniov; /* dynamically sized */ + IOVEC *iov; + int error = 0; + + /* + * Static iov[] is usually enough since UDP protocols use small + * datagrams to avoid fragmentation, but be prepared. + */ + clen = pbuf_clen(p); + if (clen > fixiovsize) { + /* + * XXX: TODO: check that clen is shorter than IOV_MAX + */ + dyniov = (IOVEC *)malloc(clen * sizeof(*dyniov)); + if (dyniov == NULL) { + error = -errno; /* sic: not a socket error */ + goto out; + } + iov = dyniov; + } + else { + dyniov = NULL; + iov = fixiov; + } + + + for (q = p, i = 0; i < clen; q = q->next, ++i) { + LWIP_ASSERT1(q != NULL); + + IOVEC_SET_BASE(iov[i], q->payload); + IOVEC_SET_LEN(iov[i], q->len); + } + +#ifndef RT_OS_WINDOWS + memset(&mh, 0, sizeof(mh)); + mh.msg_name = name; + mh.msg_namelen = namelen; + mh.msg_iov = iov; + mh.msg_iovlen = clen; + + nsent = sendmsg(sock, &mh, 0); + rc = (nsent >= 0) ? 0 : SOCKET_ERROR; +#else + rc = WSASendTo(sock, iov, (DWORD)clen, &nsent, 0, + name, (int)namelen, NULL, NULL); +#endif + if (rc == SOCKET_ERROR) { + error = SOCKERRNO(); + DPRINTF(("%s: socket %d: sendmsg: %R[sockerr]\n", + __func__, sock, error)); + error = -error; + } + + out: + if (dyniov != NULL) { + free(dyniov); + } + return error; +} + + +static const char *lwiperr[] = { + "ERR_OK", + "ERR_MEM", + "ERR_BUF", + "ERR_TIMEOUT", + "ERR_RTE", + "ERR_INPROGRESS", + "ERR_VAL", + "ERR_WOULDBLOCK", + "ERR_USE", + "ERR_ISCONN", + "ERR_ABRT", + "ERR_RST", + "ERR_CLSD", + "ERR_CONN", + "ERR_ARG", + "ERR_IF" +}; + + +const char * +proxy_lwip_strerr(err_t error) +{ + static char buf[32]; + int e = -error; + + if (0 <= e && e < (int)__arraycount(lwiperr)) { + return lwiperr[e]; + } + else { + RTStrPrintf(buf, sizeof(buf), "unknown error %d", error); + return buf; + } +} diff --git a/src/VBox/NetworkServices/NAT/proxy.h b/src/VBox/NetworkServices/NAT/proxy.h new file mode 100644 index 00000000..7da34e30 --- /dev/null +++ b/src/VBox/NetworkServices/NAT/proxy.h @@ -0,0 +1,137 @@ +/* $Id: proxy.h $ */ +/** @file + * NAT Network - common definitions and declarations. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#ifndef VBOX_INCLUDED_SRC_NAT_proxy_h +#define VBOX_INCLUDED_SRC_NAT_proxy_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#if !defined(VBOX) +#include "vbox-compat.h" +#endif + +#include "lwip/err.h" +#include "lwip/ip_addr.h" +#include "winutils.h" + +/* forward */ +struct netif; +struct tcpip_msg; +struct pbuf; +struct sockaddr; +struct sockaddr_in; +struct sockaddr_in6; + +struct ip4_lomap +{ + ip_addr_t loaddr; + uint32_t off; +}; + +struct ip4_lomap_desc +{ + const struct ip4_lomap *lomap; + unsigned int num_lomap; +}; + +struct proxy_options { + ip_addr_t ipv4_addr; + ip_addr_t ipv4_mask; + ip6_addr_t ipv6_addr; + int ipv6_enabled; + int ipv6_defroute; + SOCKET icmpsock4; + SOCKET icmpsock6; + const char *tftp_root; + const struct sockaddr_in *src4; + const struct sockaddr_in6 *src6; + const struct ip4_lomap_desc *lomap_desc; + const char **nameservers; +}; + +extern volatile struct proxy_options *g_proxy_options; +extern struct netif *g_proxy_netif; + +void proxy_init(struct netif *, struct proxy_options *); +SOCKET proxy_connected_socket(int, int, ipX_addr_t *, u16_t); +SOCKET proxy_bound_socket(int, int, struct sockaddr *); +#ifdef RT_OS_LINUX +int proxy_fixup_accepted_socket(SOCKET); +#endif +void proxy_reset_socket(SOCKET); +int proxy_sendto(SOCKET, struct pbuf *, void *, size_t); +void proxy_lwip_post(struct tcpip_msg *); +const char *proxy_lwip_strerr(err_t); + +/* proxy_rtadvd.c */ +void proxy_rtadvd_start(struct netif *); +void proxy_rtadvd_do_quick(void *); + +/* rtmon_*.c */ +int rtmon_get_defaults(void); + +/* proxy_dhcp6ds.c */ +err_t dhcp6ds_init(struct netif *); + +/* proxy_tftpd.c */ +err_t tftpd_init(struct netif *, const char *); + +/* pxtcp.c */ +void pxtcp_init(void); + +/* pxudp.c */ +void pxudp_init(void); + +/* pxdns.c */ +err_t pxdns_init(struct netif *); +void pxdns_set_nameservers(void *); + +/* pxping.c */ +err_t pxping_init(struct netif *, SOCKET, SOCKET); + + +#if defined(RT_OS_LINUX) || defined(RT_OS_SOLARIS) || defined(RT_OS_WINDOWS) +# define HAVE_SA_LEN 0 +#else +# define HAVE_SA_LEN 1 +#endif + +#define LWIP_ASSERT1(condition) LWIP_ASSERT(#condition, condition) + +/* + * TODO: DPRINTF0 should probably become LogRel but its usage needs to + * be cleaned up a bit before. + */ +#define DPRINTF0(a) Log(a) + +#define DPRINTF(a) DPRINTF1(a) +#define DPRINTF1(a) Log2(a) +#define DPRINTF2(a) Log3(a) + +#endif /* !VBOX_INCLUDED_SRC_NAT_proxy_h */ + diff --git a/src/VBox/NetworkServices/NAT/proxy_dhcp6ds.c b/src/VBox/NetworkServices/NAT/proxy_dhcp6ds.c new file mode 100644 index 00000000..a42629f7 --- /dev/null +++ b/src/VBox/NetworkServices/NAT/proxy_dhcp6ds.c @@ -0,0 +1,327 @@ +/* $Id: proxy_dhcp6ds.c $ */ +/** @file + * NAT Network - Simple stateless DHCPv6 (RFC 3736) server. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#define LOG_GROUP LOG_GROUP_NAT_SERVICE + +#include "winutils.h" +#include "dhcp6.h" +#include "proxy.h" + +#include <string.h> + +#include "lwip/opt.h" +#include "lwip/mld6.h" +#include "lwip/udp.h" + + +static void dhcp6ds_recv(void *, struct udp_pcb *, struct pbuf *, ip6_addr_t *, u16_t); + + +/* ff02::1:2 - "All_DHCP_Relay_Agents_and_Servers" link-scoped multicast */ +static /* const */ ip6_addr_t all_dhcp_relays_and_servers = { + { PP_HTONL(0xff020000UL), 0, 0, PP_HTONL(0x00010002UL) } +}; + +/* ff05::1:3 - "All_DHCP_Servers" site-scoped multicast */ +static /* const */ ip6_addr_t all_dhcp_servers = { + { PP_HTONL(0xff050000UL), 0, 0, PP_HTONL(0x00010003UL) } +}; + + +static struct udp_pcb *dhcp6ds_pcb; + +/* prebuilt Server ID option */ +#define DUID_LL_LEN (/* duid type */ 2 + /* hw type */ 2 + /* ether addr */ 6) +static u8_t dhcp6ds_serverid[/* opt */ 2 + /* optlen */ 2 + DUID_LL_LEN]; + +/* prebuilt DNS Servers option */ +static u8_t dhcp6ds_dns[/* opt */ 2 + /* optlen */ 2 + /* IPv6 addr */ 16]; + + +/** + * Initialize DHCP6 server. + * + * Join DHCP6 multicast groups. + * Create and bind server pcb. + * Prebuild fixed parts of reply. + */ +err_t +dhcp6ds_init(struct netif *proxy_netif) +{ + ip6_addr_t *pxaddr, *pxaddr_nonlocal; + int i; + err_t error; + + LWIP_ASSERT1(proxy_netif != NULL); + LWIP_ASSERT1(proxy_netif->hwaddr_len == 6); /* ethernet */ + + pxaddr = netif_ip6_addr(proxy_netif, 0); /* link local */ + + /* + * XXX: TODO: This is a leftover from testing with IPv6 mapped + * loopback with a special IPv6->IPv4 mapping hack in pxudp.c + */ + /* advertise ourself as DNS resolver - will be proxied to host */ + pxaddr_nonlocal = NULL; + for (i = 1; i < LWIP_IPV6_NUM_ADDRESSES; ++i) { + if (ip6_addr_ispreferred(netif_ip6_addr_state(proxy_netif, i)) + && !ip6_addr_islinklocal(netif_ip6_addr(proxy_netif, i))) + { + pxaddr_nonlocal = netif_ip6_addr(proxy_netif, i); + break; + } + } + LWIP_ASSERT1(pxaddr_nonlocal != NULL); /* must be configured on the netif */ + + + error = mld6_joingroup(pxaddr, &all_dhcp_relays_and_servers); + if (error != ERR_OK) { + DPRINTF0(("%s: failed to join All_DHCP_Relay_Agents_and_Servers: %s\n", + __func__, proxy_lwip_strerr(error))); + goto err; + } + + error = mld6_joingroup(pxaddr, &all_dhcp_servers); + if (error != ERR_OK) { + DPRINTF0(("%s: failed to join All_DHCP_Servers: %s\n", + __func__, proxy_lwip_strerr(error))); + goto err1; + } + + + dhcp6ds_pcb = udp_new_ip6(); + if (dhcp6ds_pcb == NULL) { + DPRINTF0(("%s: failed to allocate PCB\n", __func__)); + error = ERR_MEM; + goto err2; + } + + udp_recv_ip6(dhcp6ds_pcb, dhcp6ds_recv, NULL); + + error = udp_bind_ip6(dhcp6ds_pcb, pxaddr, DHCP6_SERVER_PORT); + if (error != ERR_OK) { + DPRINTF0(("%s: failed to bind PCB\n", __func__)); + goto err3; + } + + +#define OPT_SET(buf, off, c) do { \ + u16_t _s = PP_HTONS(c); \ + memcpy(&(buf)[off], &_s, sizeof(u16_t)); \ + } while (0) + +#define SERVERID_SET(off, c) OPT_SET(dhcp6ds_serverid, (off), (c)) +#define DNSSRV_SET(off, c) OPT_SET(dhcp6ds_dns, (off), (c)) + + SERVERID_SET(0, DHCP6_OPTION_SERVERID); + SERVERID_SET(2, DUID_LL_LEN); + SERVERID_SET(4, DHCP6_DUID_LL); + SERVERID_SET(6, ARES_HRD_ETHERNET); + memcpy(&dhcp6ds_serverid[8], proxy_netif->hwaddr, 6); + + DNSSRV_SET(0, DHCP6_OPTION_DNS_SERVERS); + DNSSRV_SET(2, 16); /* one IPv6 address */ + /* + * XXX: TODO: This is a leftover from testing with IPv6 mapped + * loopback with a special IPv6->IPv4 mapping hack in pxudp.c + */ + memcpy(&dhcp6ds_dns[4], pxaddr_nonlocal, sizeof(ip6_addr_t)); + +#undef SERVERID_SET +#undef DNSSRV_SET + + return ERR_OK; + + + err3: + udp_remove(dhcp6ds_pcb); + dhcp6ds_pcb = NULL; + err2: + mld6_leavegroup(pxaddr, &all_dhcp_servers); + err1: + mld6_leavegroup(pxaddr, &all_dhcp_relays_and_servers); + err: + return error; +} + + +static u8_t dhcp6ds_reply_buf[1024]; + +static void +dhcp6ds_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, + ip6_addr_t *addr, u16_t port) +{ + u8_t msg_header[4]; + unsigned int msg_type, msg_tid; + int copied; + size_t roff; + struct pbuf *q; + err_t error; + + LWIP_UNUSED_ARG(arg); + LWIP_ASSERT1(p != NULL); + + copied = pbuf_copy_partial(p, msg_header, sizeof(msg_header), 0); + if (copied != sizeof(msg_header)) { + DPRINTF(("%s: message header truncated\n", __func__)); + pbuf_free(p); + return; + } + pbuf_header(p, -(s16_t)sizeof(msg_header)); + + msg_type = msg_header[0]; + msg_tid = (msg_header[1] << 16) | (msg_header[2] << 8) | msg_header[3]; + DPRINTF(("%s: type %u, tid 0x%6x\n", __func__, msg_type, msg_tid)); + if (msg_type != DHCP6_INFORMATION_REQUEST) { /** @todo ? RELAY_FORW */ + pbuf_free(p); + return; + } + + roff = 0; + + msg_header[0] = DHCP6_REPLY; + memcpy(dhcp6ds_reply_buf + roff, msg_header, sizeof(msg_header)); + roff += sizeof(msg_header); + + + /* loop over options */ + while (p->tot_len > 0) { + u16_t opt, optlen; + + /* fetch option code */ + copied = pbuf_copy_partial(p, &opt, sizeof(opt), 0); + if (copied != sizeof(opt)) { + DPRINTF(("%s: option header truncated\n", __func__)); + pbuf_free(p); + return; + } + pbuf_header(p, -(s16_t)sizeof(opt)); + opt = ntohs(opt); + + /* fetch option length */ + copied = pbuf_copy_partial(p, &optlen, sizeof(optlen), 0); + if (copied != sizeof(optlen)) { + DPRINTF(("%s: option %u length truncated\n", __func__, opt)); + pbuf_free(p); + return; + } + pbuf_header(p, -(s16_t)sizeof(optlen)); + optlen = ntohs(optlen); + + /* enough data? */ + if (optlen > p->tot_len) { + DPRINTF(("%s: option %u truncated: expect %u, got %u\n", + __func__, opt, optlen, p->tot_len)); + pbuf_free(p); + return; + } + + DPRINTF2(("%s: option %u length %u\n", __func__, opt, optlen)); + + if (opt == DHCP6_OPTION_CLIENTID) { + u16_t s; + + /* "A DUID can be no more than 128 octets long (not + including the type code)." */ + if (optlen > 130) { + DPRINTF(("%s: client DUID too long: %u\n", __func__, optlen)); + pbuf_free(p); + return; + } + + s = PP_HTONS(DHCP6_OPTION_CLIENTID); + memcpy(dhcp6ds_reply_buf + roff, &s, sizeof(s)); + roff += sizeof(s); + + s = ntohs(optlen); + memcpy(dhcp6ds_reply_buf + roff, &s, sizeof(s)); + roff += sizeof(s); + + pbuf_copy_partial(p, dhcp6ds_reply_buf + roff, optlen, 0); + roff += optlen; + } + else if (opt == DHCP6_OPTION_ORO) { + u16_t *opts; + int i, nopts; + + if (optlen % 2 != 0) { + DPRINTF2(("%s: Option Request of odd length\n", __func__)); + goto bad_oro; + } + nopts = optlen / 2; + + opts = (u16_t *)malloc(optlen); + if (opts == NULL) { + DPRINTF2(("%s: failed to allocate space for Option Request\n", + __func__)); + goto bad_oro; + } + + pbuf_copy_partial(p, opts, optlen, 0); + for (i = 0; i < nopts; ++i) { + opt = ntohs(opts[i]); + DPRINTF2(("> request option %u\n", opt)); + }; + free(opts); + + bad_oro: /* empty */; + } + + pbuf_header(p, -optlen); /* go to next option */ + } + pbuf_free(p); /* done */ + + + memcpy(dhcp6ds_reply_buf + roff, dhcp6ds_serverid, sizeof(dhcp6ds_serverid)); + roff += sizeof(dhcp6ds_serverid); + + memcpy(dhcp6ds_reply_buf + roff, dhcp6ds_dns, sizeof(dhcp6ds_dns)); + roff += sizeof(dhcp6ds_dns); + + Assert(roff == (u16_t)roff); + q = pbuf_alloc(PBUF_RAW, (u16_t)roff, PBUF_RAM); + if (q == NULL) { + DPRINTF(("%s: pbuf_alloc(%d) failed\n", __func__, (int)roff)); + return; + } + + error = pbuf_take(q, dhcp6ds_reply_buf, (u16_t)roff); + if (error != ERR_OK) { + DPRINTF(("%s: pbuf_take(%d) failed: %s\n", + __func__, (int)roff, proxy_lwip_strerr(error))); + pbuf_free(q); + return; + } + + error = udp_sendto_ip6(pcb, q, addr, port); + if (error != ERR_OK) { + DPRINTF(("%s: udp_sendto failed: %s\n", + __func__, proxy_lwip_strerr(error))); + } + + pbuf_free(q); +} diff --git a/src/VBox/NetworkServices/NAT/proxy_pollmgr.c b/src/VBox/NetworkServices/NAT/proxy_pollmgr.c new file mode 100644 index 00000000..a62c1949 --- /dev/null +++ b/src/VBox/NetworkServices/NAT/proxy_pollmgr.c @@ -0,0 +1,838 @@ +/* $Id: proxy_pollmgr.c $ */ +/** @file + * NAT Network - poll manager. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#define LOG_GROUP LOG_GROUP_NAT_SERVICE + +#include "winutils.h" + +#include "proxy_pollmgr.h" +#include "proxy.h" + +#ifndef RT_OS_WINDOWS +#include <sys/socket.h> +#include <netinet/in.h> +#include <err.h> +#include <errno.h> +#include <fcntl.h> +#include <poll.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <time.h> +#include <unistd.h> +#else +#include <iprt/errcore.h> +#include <stdlib.h> +#include <string.h> +#include "winpoll.h" +#endif + +#include <iprt/req.h> +#include <iprt/errcore.h> + + +#define POLLMGR_GARBAGE (-1) + + +enum { + POLLMGR_QUEUE = 0, + + POLLMGR_SLOT_STATIC_COUNT, + POLLMGR_SLOT_FIRST_DYNAMIC = POLLMGR_SLOT_STATIC_COUNT +}; + + +struct pollmgr_chan { + struct pollmgr_handler *handler; + void *arg; + bool arg_valid; +}; + +struct pollmgr { + struct pollfd *fds; + struct pollmgr_handler **handlers; + nfds_t capacity; /* allocated size of the arrays */ + nfds_t nfds; /* part of the arrays in use */ + + /* channels (socketpair) for static slots */ + SOCKET chan[POLLMGR_SLOT_STATIC_COUNT][2]; +#define POLLMGR_CHFD_RD 0 /* - pollmgr side */ +#define POLLMGR_CHFD_WR 1 /* - client side */ + + + /* emulate channels with request queue */ + RTREQQUEUE queue; + struct pollmgr_handler queue_handler; + struct pollmgr_chan chan_handlers[POLLMGR_CHAN_COUNT]; +} pollmgr; + + +static int pollmgr_queue_callback(struct pollmgr_handler *, SOCKET, int); +static void pollmgr_chan_call_handler(int, void *); + +static void pollmgr_loop(void); + +static void pollmgr_add_at(int, struct pollmgr_handler *, SOCKET, int); +static void pollmgr_refptr_delete(struct pollmgr_refptr *); + + +/* + * We cannot portably peek at the length of the incoming datagram and + * pre-allocate pbuf chain to recvmsg() directly to it. On Linux it's + * possible to recv with MSG_PEEK|MSG_TRUC, but extra syscall is + * probably more expensive (haven't measured) than doing an extra copy + * of data, since typical UDP datagrams are small enough to avoid + * fragmentation. + * + * We can use shared buffer here since we read from sockets + * sequentially in a loop over pollfd. + */ +u8_t pollmgr_udpbuf[64 * 1024]; + + +int +pollmgr_init(void) +{ + struct pollfd *newfds; + struct pollmgr_handler **newhdls; + nfds_t newcap; + int rc, status; + nfds_t i; + + rc = RTReqQueueCreate(&pollmgr.queue); + if (RT_FAILURE(rc)) + return -1; + + pollmgr.fds = NULL; + pollmgr.handlers = NULL; + pollmgr.capacity = 0; + pollmgr.nfds = 0; + + for (i = 0; i < POLLMGR_SLOT_STATIC_COUNT; ++i) { + pollmgr.chan[i][POLLMGR_CHFD_RD] = INVALID_SOCKET; + pollmgr.chan[i][POLLMGR_CHFD_WR] = INVALID_SOCKET; + } + + for (i = 0; i < POLLMGR_SLOT_STATIC_COUNT; ++i) { +#ifndef RT_OS_WINDOWS + int j; + + status = socketpair(PF_LOCAL, SOCK_DGRAM, 0, pollmgr.chan[i]); + if (status < 0) { + DPRINTF(("socketpair: %R[sockerr]\n", SOCKERRNO())); + goto cleanup_close; + } + + /* now manually make them O_NONBLOCK */ + for (j = 0; j < 2; ++j) { + int s = pollmgr.chan[i][j]; + int sflags; + + sflags = fcntl(s, F_GETFL, 0); + if (sflags < 0) { + DPRINTF0(("F_GETFL: %R[sockerr]\n", errno)); + goto cleanup_close; + } + + status = fcntl(s, F_SETFL, sflags | O_NONBLOCK); + if (status < 0) { + DPRINTF0(("O_NONBLOCK: %R[sockerr]\n", errno)); + goto cleanup_close; + } + } +#else + status = RTWinSocketPair(PF_INET, SOCK_DGRAM, 0, pollmgr.chan[i]); + if (RT_FAILURE(status)) { + goto cleanup_close; + } +#endif + } + + + newcap = 16; /* XXX: magic */ + LWIP_ASSERT1(newcap >= POLLMGR_SLOT_STATIC_COUNT); + + newfds = (struct pollfd *) + malloc(newcap * sizeof(*pollmgr.fds)); + if (newfds == NULL) { + DPRINTF(("%s: Failed to allocate fds array\n", __func__)); + goto cleanup_close; + } + + newhdls = (struct pollmgr_handler **) + malloc(newcap * sizeof(*pollmgr.handlers)); + if (newhdls == NULL) { + DPRINTF(("%s: Failed to allocate handlers array\n", __func__)); + free(newfds); + goto cleanup_close; + } + + pollmgr.capacity = newcap; + pollmgr.fds = newfds; + pollmgr.handlers = newhdls; + + pollmgr.nfds = POLLMGR_SLOT_STATIC_COUNT; + + for (i = 0; i < pollmgr.capacity; ++i) { + pollmgr.fds[i].fd = INVALID_SOCKET; + pollmgr.fds[i].events = 0; + pollmgr.fds[i].revents = 0; + } + + /* add request queue notification */ + pollmgr.queue_handler.callback = pollmgr_queue_callback; + pollmgr.queue_handler.data = NULL; + pollmgr.queue_handler.slot = -1; + + pollmgr_add_at(POLLMGR_QUEUE, &pollmgr.queue_handler, + pollmgr.chan[POLLMGR_QUEUE][POLLMGR_CHFD_RD], + POLLIN); + + return 0; + + cleanup_close: + for (i = 0; i < POLLMGR_SLOT_STATIC_COUNT; ++i) { + SOCKET *chan = pollmgr.chan[i]; + if (chan[POLLMGR_CHFD_RD] != INVALID_SOCKET) { + closesocket(chan[POLLMGR_CHFD_RD]); + closesocket(chan[POLLMGR_CHFD_WR]); + } + } + + return -1; +} + + +/* + * Add new channel. We now implement channels with request queue, so + * all channels get the same socket that triggers queue processing. + * + * Must be called before pollmgr loop is started, so no locking. + */ +SOCKET +pollmgr_add_chan(int slot, struct pollmgr_handler *handler) +{ + AssertReturn(0 <= slot && slot < POLLMGR_CHAN_COUNT, INVALID_SOCKET); + AssertReturn(handler != NULL && handler->callback != NULL, INVALID_SOCKET); + + handler->slot = slot; + pollmgr.chan_handlers[slot].handler = handler; + return pollmgr.chan[POLLMGR_QUEUE][POLLMGR_CHFD_WR]; +} + + +/* + * This used to actually send data over the channel's socket. Now we + * queue a request and send single byte notification over shared + * POLLMGR_QUEUE socket. + */ +ssize_t +pollmgr_chan_send(int slot, void *buf, size_t nbytes) +{ + static const char notification = 0x5a; + + void *ptr; + SOCKET fd; + ssize_t nsent; + int rc; + + AssertReturn(0 <= slot && slot < POLLMGR_CHAN_COUNT, -1); + + /* + * XXX: Hack alert. We only ever "sent" single pointer which was + * simultaneously both the wakeup event for the poll and the + * argument for the channel handler that it read from the channel. + * So now we pass this pointer to the request and arrange for the + * handler to "read" it when it asks for it. + */ + if (nbytes != sizeof(void *)) { + return -1; + } + + ptr = *(void **)buf; + + rc = RTReqQueueCallEx(pollmgr.queue, NULL, 0, + RTREQFLAGS_VOID | RTREQFLAGS_NO_WAIT, + (PFNRT)pollmgr_chan_call_handler, 2, + slot, ptr); + + fd = pollmgr.chan[POLLMGR_QUEUE][POLLMGR_CHFD_WR]; + nsent = send(fd, ¬ification, 1, 0); + if (nsent == SOCKET_ERROR) { + DPRINTF(("send on chan %d: %R[sockerr]\n", slot, SOCKERRNO())); + return -1; + } + else if ((size_t)nsent != 1) { + DPRINTF(("send on chan %d: datagram truncated to %u bytes", + slot, (unsigned int)nsent)); + return -1; + } + + /* caller thinks it's sending the pointer */ + return sizeof(void *); +} + + +/* + * pollmgr_chan_send() sent us a notification, process the queue. + */ +static int +pollmgr_queue_callback(struct pollmgr_handler *handler, SOCKET fd, int revents) +{ + ssize_t nread; + int sockerr; + int rc; + + RT_NOREF(handler, revents); + Assert(pollmgr.queue != NIL_RTREQQUEUE); + + nread = recv(fd, (char *)pollmgr_udpbuf, sizeof(pollmgr_udpbuf), 0); + sockerr = SOCKERRNO(); /* save now, may be clobbered */ + + if (nread == SOCKET_ERROR) { + DPRINTF0(("%s: recv: %R[sockerr]\n", __func__, sockerr)); + return POLLIN; + } + + DPRINTF2(("%s: read %zd\n", __func__, nread)); + if (nread == 0) { + return POLLIN; + } + + rc = RTReqQueueProcess(pollmgr.queue, 0); + if (RT_UNLIKELY(rc != VERR_TIMEOUT && RT_FAILURE_NP(rc))) { + DPRINTF0(("%s: RTReqQueueProcess: %Rrc\n", __func__, rc)); + } + + return POLLIN; +} + + +/* + * Queued requests use this function to emulate the call to the + * handler's callback. + */ +static void +pollmgr_chan_call_handler(int slot, void *arg) +{ + struct pollmgr_handler *handler; + int nevents; + + AssertReturnVoid(0 <= slot && slot < POLLMGR_CHAN_COUNT); + + handler = pollmgr.chan_handlers[slot].handler; + AssertReturnVoid(handler != NULL && handler->callback != NULL); + + /* arrange for pollmgr_chan_recv_ptr() to "receive" the arg */ + pollmgr.chan_handlers[slot].arg = arg; + pollmgr.chan_handlers[slot].arg_valid = true; + + nevents = handler->callback(handler, INVALID_SOCKET, POLLIN); + if (nevents != POLLIN) { + DPRINTF2(("%s: nevents=0x%x!\n", __func__, nevents)); + } +} + + +/* + * "Receive" a pointer "sent" over poll manager channel. + */ +void * +pollmgr_chan_recv_ptr(struct pollmgr_handler *handler, SOCKET fd, int revents) +{ + int slot; + void *ptr; + + RT_NOREF(fd); + + slot = handler->slot; + Assert(0 <= slot && slot < POLLMGR_CHAN_COUNT); + + if (revents & POLLNVAL) { + errx(EXIT_FAILURE, "chan %d: fd invalid", (int)handler->slot); + /* NOTREACHED */ + } + + if (revents & (POLLERR | POLLHUP)) { + errx(EXIT_FAILURE, "chan %d: fd error", (int)handler->slot); + /* NOTREACHED */ + } + + LWIP_ASSERT1(revents & POLLIN); + + if (!pollmgr.chan_handlers[slot].arg_valid) { + err(EXIT_FAILURE, "chan %d: recv", (int)handler->slot); + /* NOTREACHED */ + } + + ptr = pollmgr.chan_handlers[slot].arg; + pollmgr.chan_handlers[slot].arg_valid = false; + + return ptr; +} + + +/* + * Must be called from pollmgr loop (via callbacks), so no locking. + */ +int +pollmgr_add(struct pollmgr_handler *handler, SOCKET fd, int events) +{ + int slot; + + DPRINTF2(("%s: new fd %d\n", __func__, fd)); + + if (pollmgr.nfds == pollmgr.capacity) { + struct pollfd *newfds; + struct pollmgr_handler **newhdls; + nfds_t newcap; + nfds_t i; + + newcap = pollmgr.capacity * 2; + + newfds = (struct pollfd *) + realloc(pollmgr.fds, newcap * sizeof(*pollmgr.fds)); + if (newfds == NULL) { + DPRINTF(("%s: Failed to reallocate fds array\n", __func__)); + handler->slot = -1; + return -1; + } + + pollmgr.fds = newfds; /* don't crash/leak if realloc(handlers) fails */ + /* but don't update capacity yet! */ + + newhdls = (struct pollmgr_handler **) + realloc(pollmgr.handlers, newcap * sizeof(*pollmgr.handlers)); + if (newhdls == NULL) { + DPRINTF(("%s: Failed to reallocate handlers array\n", __func__)); + /* if we failed to realloc here, then fds points to the + * new array, but we pretend we still has old capacity */ + handler->slot = -1; + return -1; + } + + pollmgr.handlers = newhdls; + pollmgr.capacity = newcap; + + for (i = pollmgr.nfds; i < newcap; ++i) { + newfds[i].fd = INVALID_SOCKET; + newfds[i].events = 0; + newfds[i].revents = 0; + newhdls[i] = NULL; + } + } + + slot = pollmgr.nfds; + ++pollmgr.nfds; + + pollmgr_add_at(slot, handler, fd, events); + return slot; +} + + +static void +pollmgr_add_at(int slot, struct pollmgr_handler *handler, SOCKET fd, int events) +{ + pollmgr.fds[slot].fd = fd; + pollmgr.fds[slot].events = events; + pollmgr.fds[slot].revents = 0; + pollmgr.handlers[slot] = handler; + + handler->slot = slot; +} + + +void +pollmgr_update_events(int slot, int events) +{ + LWIP_ASSERT1(slot >= POLLMGR_SLOT_FIRST_DYNAMIC); + LWIP_ASSERT1((nfds_t)slot < pollmgr.nfds); + + pollmgr.fds[slot].events = events; +} + + +void +pollmgr_del_slot(int slot) +{ + LWIP_ASSERT1(slot >= POLLMGR_SLOT_FIRST_DYNAMIC); + + DPRINTF2(("%s(%d): fd %d ! DELETED\n", + __func__, slot, pollmgr.fds[slot].fd)); + + pollmgr.fds[slot].fd = INVALID_SOCKET; /* see poll loop */ +} + + +void +pollmgr_thread(void *ignored) +{ + LWIP_UNUSED_ARG(ignored); + pollmgr_loop(); +} + + +static void +pollmgr_loop(void) +{ + int nready; + SOCKET delfirst; + SOCKET *pdelprev; + int i; + + for (;;) { +#ifndef RT_OS_WINDOWS + nready = poll(pollmgr.fds, pollmgr.nfds, -1); +#else + int rc = RTWinPoll(pollmgr.fds, pollmgr.nfds,RT_INDEFINITE_WAIT, &nready); + if (RT_FAILURE(rc)) { + err(EXIT_FAILURE, "poll"); /* XXX: what to do on error? */ + /* NOTREACHED*/ + } +#endif + + DPRINTF2(("%s: ready %d fd%s\n", + __func__, nready, (nready == 1 ? "" : "s"))); + + if (nready < 0) { + if (errno == EINTR) { + continue; + } + + err(EXIT_FAILURE, "poll"); /* XXX: what to do on error? */ + /* NOTREACHED*/ + } + else if (nready == 0) { /* cannot happen, we wait forever (-1) */ + continue; /* - but be defensive */ + } + + + delfirst = INVALID_SOCKET; + pdelprev = &delfirst; + + for (i = 0; (nfds_t)i < pollmgr.nfds && nready > 0; ++i) { + struct pollmgr_handler *handler; + SOCKET fd; + int revents, nevents; + + fd = pollmgr.fds[i].fd; + revents = pollmgr.fds[i].revents; + + /* + * Channel handlers can request deletion of dynamic slots + * by calling pollmgr_del_slot() that clobbers slot's fd. + */ + if (fd == INVALID_SOCKET && i >= POLLMGR_SLOT_FIRST_DYNAMIC) { + /* adjust count if events were pending for that slot */ + if (revents != 0) { + --nready; + } + + /* pretend that slot handler requested deletion */ + nevents = -1; + goto update_events; + } + + if (revents == 0) { + continue; /* next fd */ + } + --nready; + + handler = pollmgr.handlers[i]; + + if (handler != NULL && handler->callback != NULL) { +#ifdef LWIP_PROXY_DEBUG +# if LWIP_PROXY_DEBUG /* DEBUG */ + if (i < POLLMGR_SLOT_FIRST_DYNAMIC) { + if (revents == POLLIN) { + DPRINTF2(("%s: ch %d\n", __func__, i)); + } + else { + DPRINTF2(("%s: ch %d @ revents 0x%x!\n", + __func__, i, revents)); + } + } + else { + DPRINTF2(("%s: fd %d @ revents 0x%x\n", + __func__, fd, revents)); + } +# endif /* LWIP_PROXY_DEBUG / DEBUG */ +#endif + nevents = (*handler->callback)(handler, fd, revents); + } + else { + DPRINTF0(("%s: invalid handler for fd %d: ", __func__, fd)); + if (handler == NULL) { + DPRINTF0(("NULL\n")); + } + else { + DPRINTF0(("%p (callback = NULL)\n", (void *)handler)); + } + nevents = -1; /* delete it */ + } + + update_events: + if (nevents >= 0) { + if (nevents != pollmgr.fds[i].events) { + DPRINTF2(("%s: fd %d ! nevents 0x%x\n", + __func__, fd, nevents)); + } + pollmgr.fds[i].events = nevents; + } + else if (i < POLLMGR_SLOT_FIRST_DYNAMIC) { + /* Don't garbage-collect channels. */ + DPRINTF2(("%s: fd %d ! DELETED (channel %d)\n", + __func__, fd, i)); + pollmgr.fds[i].fd = INVALID_SOCKET; + pollmgr.fds[i].events = 0; + pollmgr.fds[i].revents = 0; + pollmgr.handlers[i] = NULL; + } + else { + DPRINTF2(("%s: fd %d ! DELETED\n", __func__, fd)); + + /* schedule for deletion (see g/c loop for details) */ + *pdelprev = i; /* make previous entry point to us */ + pdelprev = &pollmgr.fds[i].fd; + + pollmgr.fds[i].fd = INVALID_SOCKET; /* end of list (for now) */ + pollmgr.fds[i].events = POLLMGR_GARBAGE; + pollmgr.fds[i].revents = 0; + pollmgr.handlers[i] = NULL; + } + } /* processing loop */ + + + /* + * Garbage collect and compact the array. + * + * We overload pollfd::fd of garbage entries to store the + * index of the next garbage entry. The garbage list is + * co-directional with the fds array. The index of the first + * entry is in "delfirst", the last entry "points to" + * INVALID_SOCKET. + * + * See update_events code for nevents < 0 at the end of the + * processing loop above. + */ + while (delfirst != INVALID_SOCKET) { + const int last = pollmgr.nfds - 1; + + /* + * We want a live entry in the last slot to swap into the + * freed slot, so make sure we have one. + */ + if (pollmgr.fds[last].events == POLLMGR_GARBAGE /* garbage */ + || pollmgr.fds[last].fd == INVALID_SOCKET) /* or killed */ + { + /* drop garbage entry at the end of the array */ + --pollmgr.nfds; + + if (delfirst == (SOCKET)last) { + /* congruent to delnext >= pollmgr.nfds test below */ + delfirst = INVALID_SOCKET; /* done */ + } + } + else { + const SOCKET delnext = pollmgr.fds[delfirst].fd; + + /* copy live entry at the end to the first slot being freed */ + pollmgr.fds[delfirst] = pollmgr.fds[last]; /* struct copy */ + pollmgr.handlers[delfirst] = pollmgr.handlers[last]; + pollmgr.handlers[delfirst]->slot = (int)delfirst; + --pollmgr.nfds; + + if ((nfds_t)delnext >= pollmgr.nfds) { + delfirst = INVALID_SOCKET; /* done */ + } + else { + delfirst = delnext; + } + } + + pollmgr.fds[last].fd = INVALID_SOCKET; + pollmgr.fds[last].events = 0; + pollmgr.fds[last].revents = 0; + pollmgr.handlers[last] = NULL; + } + } /* poll loop */ +} + + +/** + * Create strongly held refptr. + */ +struct pollmgr_refptr * +pollmgr_refptr_create(struct pollmgr_handler *ptr) +{ + struct pollmgr_refptr *rp; + + LWIP_ASSERT1(ptr != NULL); + + rp = (struct pollmgr_refptr *)malloc(sizeof (*rp)); + if (rp == NULL) { + return NULL; + } + + sys_mutex_new(&rp->lock); + rp->ptr = ptr; + rp->strong = 1; + rp->weak = 0; + + return rp; +} + + +static void +pollmgr_refptr_delete(struct pollmgr_refptr *rp) +{ + if (rp == NULL) { + return; + } + + LWIP_ASSERT1(rp->strong == 0); + LWIP_ASSERT1(rp->weak == 0); + + sys_mutex_free(&rp->lock); + free(rp); +} + + +/** + * Add weak reference before "rp" is sent over a poll manager channel. + */ +void +pollmgr_refptr_weak_ref(struct pollmgr_refptr *rp) +{ + sys_mutex_lock(&rp->lock); + + LWIP_ASSERT1(rp->ptr != NULL); + LWIP_ASSERT1(rp->strong > 0); + + ++rp->weak; + + sys_mutex_unlock(&rp->lock); +} + + +/** + * Try to get the pointer from implicitely weak reference we've got + * from a channel. + * + * If we detect that the object is still strongly referenced, but no + * longer registered with the poll manager we abort strengthening + * conversion here b/c lwip thread callback is already scheduled to + * destruct the object. + */ +struct pollmgr_handler * +pollmgr_refptr_get(struct pollmgr_refptr *rp) +{ + struct pollmgr_handler *handler; + size_t weak; + + sys_mutex_lock(&rp->lock); + + LWIP_ASSERT1(rp->weak > 0); + weak = --rp->weak; + + handler = rp->ptr; + if (handler == NULL) { + LWIP_ASSERT1(rp->strong == 0); + sys_mutex_unlock(&rp->lock); + if (weak == 0) { + pollmgr_refptr_delete(rp); + } + return NULL; + } + + LWIP_ASSERT1(rp->strong == 1); + + /* + * Here we woild do: + * + * ++rp->strong; + * + * and then, after channel handler is done, we would decrement it + * back. + * + * Instead we check that the object is still registered with poll + * manager. If it is, there's no race with lwip thread trying to + * drop its strong reference, as lwip thread callback to destruct + * the object is always scheduled by its poll manager callback. + * + * Conversly, if we detect that the object is no longer registered + * with poll manager, we immediately abort. Since channel handler + * can't do anything useful anyway and would have to return + * immediately. + * + * Since channel handler would always find rp->strong as it had + * left it, just elide extra strong reference creation to avoid + * the whole back-and-forth. + */ + + if (handler->slot < 0) { /* no longer polling */ + sys_mutex_unlock(&rp->lock); + return NULL; + } + + sys_mutex_unlock(&rp->lock); + return handler; +} + + +/** + * Remove (the only) strong reference. + * + * If it were real strong/weak pointers, we should also call + * destructor for the referenced object, but + */ +void +pollmgr_refptr_unref(struct pollmgr_refptr *rp) +{ + sys_mutex_lock(&rp->lock); + + LWIP_ASSERT1(rp->strong == 1); + --rp->strong; + + if (rp->strong > 0) { + sys_mutex_unlock(&rp->lock); + } + else { + size_t weak; + + /* void *ptr = rp->ptr; */ + rp->ptr = NULL; + + /* delete ptr; // see doc comment */ + + weak = rp->weak; + sys_mutex_unlock(&rp->lock); + if (weak == 0) { + pollmgr_refptr_delete(rp); + } + } +} diff --git a/src/VBox/NetworkServices/NAT/proxy_pollmgr.h b/src/VBox/NetworkServices/NAT/proxy_pollmgr.h new file mode 100644 index 00000000..9ab6bf19 --- /dev/null +++ b/src/VBox/NetworkServices/NAT/proxy_pollmgr.h @@ -0,0 +1,95 @@ +/* $Id: proxy_pollmgr.h $ */ +/** @file + * NAT Network - poll manager, definitions and declarations. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#ifndef VBOX_INCLUDED_SRC_NAT_proxy_pollmgr_h +#define VBOX_INCLUDED_SRC_NAT_proxy_pollmgr_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#ifndef RT_OS_WINDOWS +# include <unistd.h> /* for ssize_t */ +#endif +#include "lwip/sys.h" + +enum pollmgr_slot_t { + POLLMGR_CHAN_PXTCP_ADD, /* new proxy tcp connection from guest */ + POLLMGR_CHAN_PXTCP_POLLIN, /* free space in ringbuf, may POLLIN */ + POLLMGR_CHAN_PXTCP_POLLOUT, /* schedule one-shot POLLOUT callback */ + POLLMGR_CHAN_PXTCP_DEL, /* delete pxtcp */ + POLLMGR_CHAN_PXTCP_RESET, /* send RST and delete pxtcp */ + + POLLMGR_CHAN_PXUDP_ADD, /* new proxy udp conversation from guest */ + POLLMGR_CHAN_PXUDP_DEL, /* delete pxudp from pollmgr */ + + POLLMGR_CHAN_PORTFWD, /* add/remove port forwarding rules */ + + POLLMGR_CHAN_COUNT +}; + + +struct pollmgr_handler; /* forward */ +typedef int (*pollmgr_callback)(struct pollmgr_handler *, SOCKET, int); + +struct pollmgr_handler { + pollmgr_callback callback; + void *data; + int slot; +}; + +struct pollmgr_refptr { + struct pollmgr_handler *ptr; + sys_mutex_t lock; + size_t strong; + size_t weak; +}; + +int pollmgr_init(void); + +/* static named slots (aka "channels") */ +SOCKET pollmgr_add_chan(int, struct pollmgr_handler *); +ssize_t pollmgr_chan_send(int, void *buf, size_t nbytes); +void *pollmgr_chan_recv_ptr(struct pollmgr_handler *, SOCKET, int); + +/* dynamic slots */ +int pollmgr_add(struct pollmgr_handler *, SOCKET, int); + +/* special-purpose strong/weak references */ +struct pollmgr_refptr *pollmgr_refptr_create(struct pollmgr_handler *); +void pollmgr_refptr_weak_ref(struct pollmgr_refptr *); +struct pollmgr_handler *pollmgr_refptr_get(struct pollmgr_refptr *); +void pollmgr_refptr_unref(struct pollmgr_refptr *); + +void pollmgr_update_events(int, int); +void pollmgr_del_slot(int); + +void pollmgr_thread(void *); + +/* buffer for callbacks to receive udp without worrying about truncation */ +extern u8_t pollmgr_udpbuf[64 * 1024]; + +#endif /* !VBOX_INCLUDED_SRC_NAT_proxy_pollmgr_h */ diff --git a/src/VBox/NetworkServices/NAT/proxy_rtadvd.c b/src/VBox/NetworkServices/NAT/proxy_rtadvd.c new file mode 100644 index 00000000..8ba2d3fc --- /dev/null +++ b/src/VBox/NetworkServices/NAT/proxy_rtadvd.c @@ -0,0 +1,427 @@ +/* $Id: proxy_rtadvd.c $ */ +/** @file + * NAT Network - IPv6 router advertisement daemon. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#define LOG_GROUP LOG_GROUP_NAT_SERVICE + +#include "winutils.h" + +#include "proxy.h" + +#include "lwip/opt.h" +#include "lwip/sys.h" +#include "lwip/stats.h" +#include "lwip/timers.h" + +#include "lwip/inet_chksum.h" +#include "lwip/icmp6.h" +#include "lwip/nd6.h" + +#include "lwip/raw.h" + +#include <string.h> + + +static void proxy_rtadvd_timer(void *); +static void proxy_rtadvd_send_multicast(struct netif *); +static void proxy_rtadvd_fill_payload(struct netif *, int); + +static u8_t rtadvd_recv(void *, struct raw_pcb *, struct pbuf *, ip6_addr_t *); + + +/* ff02::1 - link-local all nodes multicast address */ +static ip6_addr_t allnodes_linklocal = { + { PP_HTONL(0xff020000UL), 0, 0, PP_HTONL(0x00000001UL) } +}; + + +/* + * Unsolicited Router Advertisement payload. + * + * NB: Since ICMP checksum covers pseudo-header with destination + * address (link-local allnodes multicast in this case) this payload + * cannot be used for solicited replies to unicast addresses. + */ +static unsigned int unsolicited_ra_payload_length; +static u8_t unsolicited_ra_payload[ + sizeof(struct ra_header) + /* reserves enough space for NETIF_MAX_HWADDR_LEN */ + + sizeof(struct lladdr_option) + /* we only announce one prefix */ + + sizeof(struct prefix_option) * 1 +]; + + +static int ndefaults = 0; + +static struct raw_pcb *rtadvd_pcb; + + +void +proxy_rtadvd_start(struct netif *proxy_netif) +{ +#if 0 /* XXX */ + ndefaults = rtmon_get_defaults(); +#else + ndefaults = g_proxy_options->ipv6_defroute; +#endif + if (ndefaults < 0) { + DPRINTF0(("rtadvd: failed to read IPv6 routing table, aborting\n")); + return; + } + + proxy_rtadvd_fill_payload(proxy_netif, ndefaults > 0); + + rtadvd_pcb = raw_new_ip6(IP6_NEXTH_ICMP6); + if (rtadvd_pcb == NULL) { + DPRINTF0(("rtadvd: failed to allocate pcb, aborting\n")); + return; + } + + /* + * We cannot use raw_bind_ip6() since raw_input() doesn't grok + * multicasts. We are going to use ip6_output_if() directly. + */ + raw_recv_ip6(rtadvd_pcb, rtadvd_recv, proxy_netif); + + sys_timeout(3 * 1000, proxy_rtadvd_timer, proxy_netif); +} + + +static int quick_ras = 2; + + +/** + * lwIP thread callback invoked when we start/stop advertising default + * route. + */ +void +proxy_rtadvd_do_quick(void *arg) +{ + struct netif *proxy_netif = (struct netif *)arg; + + quick_ras = 2; + sys_untimeout(proxy_rtadvd_timer, proxy_netif); + proxy_rtadvd_timer(proxy_netif); /* sends and re-arms */ +} + + +static void +proxy_rtadvd_timer(void *arg) +{ + struct netif *proxy_netif = (struct netif *)arg; + int newdefs; + u32_t delay; + +#if 0 /* XXX */ + newdefs = rtmon_get_defaults(); +#else + newdefs = g_proxy_options->ipv6_defroute; +#endif + if (newdefs != ndefaults && newdefs != -1) { + ndefaults = newdefs; + proxy_rtadvd_fill_payload(proxy_netif, ndefaults > 0); + } + + proxy_rtadvd_send_multicast(proxy_netif); + + if (quick_ras > 0) { + --quick_ras; + delay = 16 * 1000; + } + else { + delay = 600 * 1000; + } + + sys_timeout(delay, proxy_rtadvd_timer, proxy_netif); +} + + +/* + * This should be folded into icmp6/nd6 input, but I don't want to + * solve this in general, making it configurable, etc. + * + * Cf. RFC 4861: + * 6.1.1. Validation of Router Solicitation Messages + */ +static u8_t +rtadvd_recv(void *arg, struct raw_pcb *pcb, struct pbuf *p, ip6_addr_t *addr) +{ + enum raw_recv_status { RAW_RECV_CONTINUE = 0, RAW_RECV_CONSUMED = 1 }; + + struct netif *proxy_netif = (struct netif *)arg; + struct ip6_hdr *ip6_hdr; + struct icmp6_hdr *icmp6_hdr; + struct lladdr_option *lladdr_opt; + void *option; + u8_t opttype, optlen8; + + LWIP_UNUSED_ARG(pcb); + LWIP_UNUSED_ARG(addr); + + /* save a pointer to IP6 header and skip to ICMP6 payload */ + ip6_hdr = (struct ip6_hdr *)p->payload; + pbuf_header(p, -ip_current_header_tot_len()); + + if (p->len < sizeof(struct icmp6_hdr)) { + ICMP6_STATS_INC(icmp6.lenerr); + goto drop; + } + + if (ip6_chksum_pseudo(p, IP6_NEXTH_ICMP6, p->tot_len, + ip6_current_src_addr(), + ip6_current_dest_addr()) != 0) + { + ICMP6_STATS_INC(icmp6.chkerr); + goto drop; + } + + icmp6_hdr = (struct icmp6_hdr *)p->payload; + if (icmp6_hdr->type != ICMP6_TYPE_RS) { + pbuf_header(p, ip_current_header_tot_len()); /* restore payload ptr */ + return RAW_RECV_CONTINUE; /* not interested */ + } + + /* only now that we know it's ICMP6_TYPE_RS we can check IP6 hop limit */ + if (IP6H_HOPLIM(ip6_hdr) != 255) { + ICMP6_STATS_INC(icmp6.proterr); + goto drop; + } + + /* future, backward-incompatible changes may use different Code values. */ + if (icmp6_hdr->code != 0) { + ICMP6_STATS_INC(icmp6.proterr); + goto drop; + } + + /* skip past rs_header, nothing interesting in it */ + if (p->len < sizeof(struct rs_header)) { + ICMP6_STATS_INC(icmp6.lenerr); + goto drop; + } + pbuf_header(p, -(s16_t)sizeof(struct rs_header)); + + lladdr_opt = NULL; + while (p->len > 0) { + int optlen; + + if (p->len < 8) { + ICMP6_STATS_INC(icmp6.lenerr); + goto drop; + } + + option = p->payload; + opttype = ((u8_t *)option)[0]; + optlen8 = ((u8_t *)option)[1]; /* in units of 8 octets */ + + if (optlen8 == 0) { + ICMP6_STATS_INC(icmp6.proterr); + goto drop; + } + + optlen = (unsigned int)optlen8 << 3; + if (p->len < optlen) { + ICMP6_STATS_INC(icmp6.lenerr); + goto drop; + } + + if (opttype == ND6_OPTION_TYPE_SOURCE_LLADDR) { + if (lladdr_opt != NULL) { /* duplicate */ + ICMP6_STATS_INC(icmp6.proterr); + goto drop; + } + lladdr_opt = (struct lladdr_option *)option; + } + + pbuf_header(p, -optlen); + } + + if (ip6_addr_isany(ip6_current_src_addr())) { + if (lladdr_opt != NULL) { + ICMP6_STATS_INC(icmp6.proterr); + goto drop; + } + + /* reply with multicast RA */ + } + else { + /* + * XXX: Router is supposed to update its Neighbor Cache (6.2.6), + * but it's hidden inside nd6.c. + */ + + /* may reply with either unicast or multicast RA */ + } + /* we just always reply with multicast RA */ + + pbuf_free(p); /* NB: this invalidates lladdr_option */ + + sys_untimeout(proxy_rtadvd_timer, proxy_netif); + proxy_rtadvd_timer(proxy_netif); /* sends and re-arms */ + + return RAW_RECV_CONSUMED; + + drop: + pbuf_free(p); + ICMP6_STATS_INC(icmp6.drop); + return RAW_RECV_CONSUMED; +} + + +static void +proxy_rtadvd_send_multicast(struct netif *proxy_netif) +{ + struct pbuf *ph, *pp; + err_t error; + + ph = pbuf_alloc(PBUF_IP, 0, PBUF_RAM); + if (ph == NULL) { + DPRINTF0(("%s: failed to allocate RA header pbuf\n", __func__)); + return; + } + + pp = pbuf_alloc(PBUF_RAW, unsolicited_ra_payload_length, PBUF_ROM); + if (pp == NULL) { + DPRINTF0(("%s: failed to allocate RA payload pbuf\n", __func__)); + pbuf_free(ph); + return; + } + pp->payload = unsolicited_ra_payload; + pbuf_chain(ph, pp); + + error = ip6_output_if(ph, + netif_ip6_addr(proxy_netif, 0), /* src: link-local */ + &allnodes_linklocal, /* dst */ + 255, /* hop limit */ + 0, /* traffic class */ + IP6_NEXTH_ICMP6, + proxy_netif); + if (error != ERR_OK) { + DPRINTF0(("%s: failed to send RA (err=%d)\n", __func__, error)); + } + + pbuf_free(pp); + pbuf_free(ph); +} + + +/* + * XXX: TODO: Only ra_header::router_lifetime (and hence + * ra_header::chksum) need to be changed, so we can precompute it once + * and then only update these two fields. + */ +static void +proxy_rtadvd_fill_payload(struct netif *proxy_netif, int is_default) +{ + struct pbuf *p; + struct ra_header *ra_hdr; + struct lladdr_option *lladdr_opt; + struct prefix_option *pfx_opt; + unsigned int lladdr_optlen; + + LWIP_ASSERT("netif hwaddr too long", + proxy_netif->hwaddr_len <= NETIF_MAX_HWADDR_LEN); + + /* type + length + ll addr + round up to 8 octets */ + lladdr_optlen = (2 + proxy_netif->hwaddr_len + 7) & ~0x7; + + /* actual payload length */ + unsolicited_ra_payload_length = + sizeof(struct ra_header) + + lladdr_optlen + + sizeof(struct prefix_option) * 1; + + /* Set fields. */ + ra_hdr = (struct ra_header *)unsolicited_ra_payload; + lladdr_opt = (struct lladdr_option *)((u8_t *)ra_hdr + sizeof(struct ra_header)); + pfx_opt = (struct prefix_option *)((u8_t *)lladdr_opt + lladdr_optlen); + + memset(unsolicited_ra_payload, 0, sizeof(unsolicited_ra_payload)); + + ra_hdr->type = ICMP6_TYPE_RA; + +#if 0 + /* + * "M" flag. Tell guests to use stateful DHCP6. Disabled here + * since we don't provide stateful server. + */ + ra_hdr->flags |= ND6_RA_FLAG_MANAGED_ADDR_CONFIG; +#endif + /* + * XXX: TODO: Disable "O" flag for now to match disabled stateless + * server. We don't yet get IPv6 nameserver addresses from + * HostDnsService, so we have nothing to say, don't tell guests to + * come asking. + */ +#if 0 + /* + * "O" flag. Tell guests to use DHCP6 for DNS and the like. This + * is served by simple stateless server (RFC 3736). + * + * XXX: "STATEFUL" in the flag name was probably a bug in RFC2461. + * It's present in the text, but not in the router configuration + * variable name. It's dropped in the text in RFC4861. + */ + ra_hdr->flags |= ND6_RA_FLAG_OTHER_STATEFUL_CONFIG; +#endif + + if (is_default) { + ra_hdr->router_lifetime = PP_HTONS(1200); /* seconds */ + } + else { + ra_hdr->router_lifetime = 0; + } + + lladdr_opt->type = ND6_OPTION_TYPE_SOURCE_LLADDR; + lladdr_opt->length = lladdr_optlen >> 3; /* in units of 8 octets */ + memcpy(lladdr_opt->addr, proxy_netif->hwaddr, proxy_netif->hwaddr_len); + + pfx_opt->type = ND6_OPTION_TYPE_PREFIX_INFO; + pfx_opt->length = 4; + pfx_opt->prefix_length = 64; + pfx_opt->flags = ND6_PREFIX_FLAG_ON_LINK + | ND6_PREFIX_FLAG_AUTONOMOUS; + pfx_opt->valid_lifetime = ~0U; /* infinite */ + pfx_opt->preferred_lifetime = ~0U; /* infinite */ + pfx_opt->prefix.addr[0] = netif_ip6_addr(proxy_netif, 1)->addr[0]; + pfx_opt->prefix.addr[1] = netif_ip6_addr(proxy_netif, 1)->addr[1]; + + + /* we need a temp pbuf to calculate the checksum */ + p = pbuf_alloc(PBUF_IP, unsolicited_ra_payload_length, PBUF_ROM); + if (p == NULL) { + DPRINTF0(("rtadvd: failed to allocate RA pbuf\n")); + return; + } + p->payload = unsolicited_ra_payload; + + ra_hdr->chksum = ip6_chksum_pseudo(p, IP6_NEXTH_ICMP6, p->len, + /* src addr: netif's link-local */ + netif_ip6_addr(proxy_netif, 0), + /* dst addr */ + &allnodes_linklocal); + pbuf_free(p); +} diff --git a/src/VBox/NetworkServices/NAT/proxy_tftpd.c b/src/VBox/NetworkServices/NAT/proxy_tftpd.c new file mode 100644 index 00000000..6baa2cae --- /dev/null +++ b/src/VBox/NetworkServices/NAT/proxy_tftpd.c @@ -0,0 +1,991 @@ +/* $Id: proxy_tftpd.c $ */ +/** @file + * NAT Network - TFTP server. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#define LOG_GROUP LOG_GROUP_NAT_SERVICE + +#include "winutils.h" + +#include "proxy.h" +#include "tftp.h" + +#ifndef RT_OS_WINDOWS +#include <sys/types.h> +#include <sys/stat.h> +#include <errno.h> +#include <fcntl.h> +#include <stdarg.h> +#include <stdio.h> +#include <string.h> +#include <unistd.h> +#else +#include <sys/types.h> +#include <sys/stat.h> +#include <errno.h> +#include <fcntl.h> +#include <io.h> +#include <stdarg.h> +#include <stdio.h> +#include <string.h> + +# define O_RDONLY _O_RDONLY +# define S_ISREG(x) ((x) & _S_IFREG) +#endif + +#include "lwip/timers.h" +#include "lwip/udp.h" + +#include <iprt/string.h> + +struct xfer { + struct udp_pcb *pcb; + int fd; + unsigned int ack; + struct pbuf *pbuf; + + struct pbuf *oack; + + int rexmit; + + ipX_addr_t peer_ip; + u16_t peer_port; + + char *filename; + int octet; + + /* options */ + unsigned int blksize; + int blksize_from_opt; + + unsigned int timeout; + int timeout_from_opt; + + off_t tsize; + int tsize_from_opt; +}; + +struct tftpd { + struct udp_pcb *pcb; + char *root; + +#define TFTP_MAX_XFERS 3 + struct xfer xfers[TFTP_MAX_XFERS]; +}; + +struct tftp_option { + const char *name; + int (*getopt)(struct xfer *, const char *); + int (*ackopt)(struct xfer *, char **, size_t *); +}; + + +static void tftpd_recv(void *, struct udp_pcb *, struct pbuf *, ip_addr_t *, u16_t); + +static void tftpd_rrq(struct pbuf *, ip_addr_t *, u16_t); + +static void tftp_xfer_recv(void *, struct udp_pcb *, struct pbuf *, ip_addr_t *, u16_t); + +static void tftp_recv_ack(struct xfer *, u16_t); +static void tftp_fillbuf(struct xfer *); +static void tftp_send(struct xfer *); +static void tftp_timeout(void *); + +static struct xfer *tftp_xfer_alloc(ip_addr_t *, u16_t); +static int tftp_xfer_create_pcb(struct xfer *); +static void tftp_xfer_free(struct xfer *); + +static int tftp_parse_filename(struct xfer *, char **, size_t *); +static int tftp_parse_mode(struct xfer *, char **, size_t *); +static int tftp_parse_option(struct xfer *, char **, size_t *); + +static int tftp_opt_blksize(struct xfer *, const char *); +static int tftp_opt_timeout(struct xfer *, const char *); +static int tftp_opt_tsize(struct xfer *, const char *); + +static char *tftp_getstr(struct xfer *, const char *, char **, size_t *); + +static int tftp_ack_blksize(struct xfer *, char **, size_t *); +static int tftp_ack_timeout(struct xfer *, char **, size_t *); +static int tftp_ack_tsize(struct xfer *, char **, size_t *); + +static int tftp_add_oack(char **, size_t *, const char *, const char *, ...) __attribute__((format(printf, 4, 5))); + +static ssize_t tftp_strnlen(char *, size_t); + +static int tftp_internal_error(struct xfer *); +static int tftp_error(struct xfer *, u16_t, const char *, ...) __attribute__((format(printf, 3, 4))); +static void tftpd_error(ip_addr_t *, u16_t, u16_t, const char *, ...) __attribute__((format(printf, 4, 5))); +static struct pbuf *tftp_verror(u16_t, const char *, va_list); + + +/* const */ int report_transient_errors = 1; +static struct tftpd tftpd; + +static struct tftp_option tftp_options[] = { + { "blksize", tftp_opt_blksize, tftp_ack_blksize }, /* RFC 2348 */ + { "timeout", tftp_opt_timeout, tftp_ack_timeout }, /* RFC 2349 */ + { "tsize", tftp_opt_tsize, tftp_ack_tsize }, /* RFC 2349 */ + { NULL, NULL, NULL } +}; + + +err_t +tftpd_init(struct netif *proxy_netif, const char *tftproot) +{ + size_t len; + err_t error; + + tftpd.root = strdup(tftproot); + if (tftpd.root == NULL) { + DPRINTF0(("%s: failed to allocate tftpd.root\n", __func__)); + return ERR_MEM; + } + + len = strlen(tftproot); + if (tftpd.root[len - 1] == '/') { + tftpd.root[len - 1] = '\0'; + } + + tftpd.pcb = udp_new(); + if (tftpd.pcb == NULL) { + DPRINTF0(("%s: failed to allocate PCB\n", __func__)); + return ERR_MEM; + } + + udp_recv(tftpd.pcb, tftpd_recv, NULL); + + error = udp_bind(tftpd.pcb, &proxy_netif->ip_addr, TFTP_SERVER_PORT); + if (error != ERR_OK) { + DPRINTF0(("%s: failed to bind PCB\n", __func__)); + return error; + } + + return ERR_OK; +} + + +static void +tftpd_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, + ip_addr_t *addr, u16_t port) +{ + u16_t op; + + LWIP_ASSERT1(pcb == tftpd.pcb); + + LWIP_UNUSED_ARG(pcb); /* only in assert */ + LWIP_UNUSED_ARG(arg); + + if (pbuf_clen(p) > 1) { /* this code assumes contiguous aligned payload */ + pbuf_free(p); + return; + } + + op = ntohs(*(u16_t *)p->payload); + switch (op) { + case TFTP_RRQ: + tftpd_rrq(p, addr, port); + break; + + case TFTP_WRQ: + tftpd_error(addr, port, TFTP_EACCESS, "Permission denied"); + break; + + default: + tftpd_error(addr, port, TFTP_ENOSYS, "Bad opcode %d", op); + break; + } + + pbuf_free(p); +} + + +/** + * Parse Read Request packet and start new transfer. + */ +static void +tftpd_rrq(struct pbuf *p, ip_addr_t *addr, u16_t port) +{ + struct xfer *xfer; + char *s; + size_t len; + int has_options; + int status; + + xfer = tftp_xfer_alloc(addr, port); + if (xfer == NULL) { + return; + } + + /* skip opcode */ + s = (char *)p->payload + sizeof(u16_t); + len = p->len - sizeof(u16_t); + + + /* + * Parse RRQ: + * filename, mode, [opt1, value1, [...] ] + */ + status = tftp_parse_filename(xfer, &s, &len); + if (status < 0) { + goto terminate; + } + + status = tftp_parse_mode(xfer, &s, &len); + if (status < 0) { + goto terminate; + } + + has_options = 0; + while (len > 0) { + status = tftp_parse_option(xfer, &s, &len); + if (status < 0) { + goto terminate; + } + has_options += status; + } + + + /* + * Create OACK packet if necessary. + */ + if (has_options) { + xfer->oack = pbuf_alloc(PBUF_RAW, 128, PBUF_RAM); + if (xfer->oack != NULL) { + struct tftp_option *o; + + ((u16_t *)xfer->oack->payload)[0] = PP_HTONS(TFTP_OACK); + + s = (char *)xfer->oack->payload + sizeof(u16_t); + len = xfer->oack->len - sizeof(u16_t); + + for (o = &tftp_options[0]; o->name != NULL; ++o) { + status = (*o->ackopt)(xfer, &s, &len); + if (status < 0) { + pbuf_free(xfer->oack); + xfer->oack = NULL; + break; + } + } + + if (xfer->oack != NULL) { + Assert((u16_t)(xfer->oack->len - len) == xfer->oack->len - len); + pbuf_realloc(xfer->oack, (u16_t)(xfer->oack->len - len)); + } + } + } + + + /* + * Create static pbuf that will be used for all data packets. + */ + xfer->pbuf = pbuf_alloc(PBUF_RAW, xfer->blksize + 4, PBUF_RAM); + if (xfer->pbuf == NULL) { + tftp_internal_error(xfer); + goto terminate; + } + ((u16_t *)xfer->pbuf->payload)[0] = PP_HTONS(TFTP_DATA); + + + /* + * Finally, create PCB. Before this point any error was reported + * from the server port (see tftp_error() for the reason). + */ + status = tftp_xfer_create_pcb(xfer); + if (status < 0) { + goto terminate; + } + + if (xfer->oack) { + tftp_send(xfer); + } + else { + /* trigger send of the first data packet */ + tftp_recv_ack(xfer, 0); + } + + return; + + terminate: + DPRINTF(("%s: terminated", __func__)); + tftp_xfer_free(xfer); +} + + +static void +tftp_xfer_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, + ip_addr_t *addr, u16_t port) +{ + struct xfer *xfer = (struct xfer *)arg; + u16_t op; + + LWIP_UNUSED_ARG(pcb); /* assert only */ + LWIP_UNUSED_ARG(addr); + LWIP_UNUSED_ARG(port); + + LWIP_ASSERT1(xfer->pcb == pcb); + + if (p->len < 2) { + tftp_error(xfer, TFTP_ENOSYS, "Short packet"); + tftp_xfer_free(xfer); + pbuf_free(p); + return; + } + + op = ntohs(*(u16_t *)p->payload); + if (op == TFTP_ACK) { + u16_t ack; + + if (p->len < 4) { + tftp_error(xfer, TFTP_ENOSYS, "Short packet"); + tftp_xfer_free(xfer); + pbuf_free(p); + return; + } + + ack = ntohs(((u16_t *)p->payload)[1]); + tftp_recv_ack(xfer, ack); + } + else if (op == TFTP_ERROR) { + tftp_xfer_free(xfer); + } + else { + tftp_error(xfer, TFTP_ENOSYS, "Unexpected opcode %d", op); + tftp_xfer_free(xfer); + } + + pbuf_free(p); +} + + +static void +tftp_recv_ack(struct xfer *xfer, u16_t ack) +{ + if (ack != (u16_t)xfer->ack) { + DPRINTF2(("%s: expect %u (%u), got %u\n", + __func__, (u16_t)xfer->ack, xfer->ack, ack)); + return; + } + + sys_untimeout(tftp_timeout, xfer); + xfer->rexmit = 0; + + if (xfer->pbuf->len < xfer->blksize) { + DPRINTF(("%s: got final ack %u (%u)\n", + __func__, (u16_t)xfer->ack, xfer->ack)); + tftp_xfer_free(xfer); + return; + } + + if (xfer->oack != NULL) { + pbuf_free(xfer->oack); + xfer->oack = NULL; + } + + ++xfer->ack; + tftp_fillbuf(xfer); + tftp_send(xfer); +} + + +static void +tftp_send(struct xfer *xfer) +{ + struct pbuf *pbuf; + + pbuf = xfer->oack ? xfer->oack : xfer->pbuf; + udp_send(xfer->pcb, pbuf); + sys_timeout(xfer->timeout * 1000, tftp_timeout, xfer); +} + + +static void +tftp_timeout(void *arg) +{ + struct xfer *xfer = (struct xfer *)arg; + int maxrexmit; + + maxrexmit = xfer->timeout < 60 ? 5 : 3; + if (++xfer->rexmit < maxrexmit) { + tftp_send(xfer); + } + else { + tftp_xfer_free(xfer); + } +} + + +static void +tftp_fillbuf(struct xfer *xfer) +{ + ssize_t nread; + + DPRINTF2(("%s: reading block %u\n", __func__, xfer->ack)); + + ((u16_t *)xfer->pbuf->payload)[1] = htons(xfer->ack); + nread = read(xfer->fd, (char *)xfer->pbuf->payload + 4, xfer->blksize); + + if (nread < 0) { + tftp_error(xfer, TFTP_EUNDEF, "Read failed"); + return; + } + + pbuf_realloc(xfer->pbuf, nread + 4); +} + + +/** + * Find a free transfer slot (without a pcb). Record peer's IP + * address and port, but don't allocate a pcb yet. + * + * We delay creation of the pcb in response to the original request + * until the request is verified and accepted. This makes using + * tcpdump(8) easier, since tcpdump does not track TFTP transfers, so + * an error reply from a new pcb is not recognized as such and is not + * decoded as TFTP (see tftp_error()). + * + * If the request is rejected, the pcb remains NULL and the transfer + * slot remains unallocated. Since all TFTP processing happens on the + * lwIP thread, there's no concurrent processing, so we don't need to + * "lock" the transfer slot until the pcb is allocated. + */ +static struct xfer * +tftp_xfer_alloc(ip_addr_t *addr, u16_t port) +{ + struct xfer *xfer; + int i; + + /* Find free xfer slot */ + xfer = NULL; + for (i = 0; i < TFTP_MAX_XFERS; ++i) { + if (tftpd.xfers[i].pcb == NULL) { + xfer = &tftpd.xfers[i]; + break; + } + } + + if (xfer == NULL) { + if (report_transient_errors) { + tftpd_error(addr, port, TFTP_EUNDEF, + "Maximum number of simultaneous connections exceeded"); + } + return NULL; + } + + ipX_addr_copy(0, xfer->peer_ip, *ip_2_ipX(addr)); + xfer->peer_port = port; + + xfer->ack = 0; + + xfer->pbuf = NULL; + xfer->oack = NULL; + xfer->rexmit = 0; + + xfer->blksize = 512; + xfer->blksize_from_opt = 0; + + xfer->timeout = 1; + xfer->timeout_from_opt = 0; + + xfer->tsize = -1; + xfer->tsize_from_opt = 0; + + return xfer; +} + + +static int +tftp_xfer_create_pcb(struct xfer *xfer) +{ + struct udp_pcb *pcb; + err_t error; + + pcb = udp_new(); + + /* Bind */ + if (pcb != NULL) { + error = udp_bind(pcb, ipX_2_ip(&tftpd.pcb->local_ip), 0); + if (error != ERR_OK) { + udp_remove(pcb); + pcb = NULL; + } + } + + /* Connect */ + if (pcb != NULL) { + error = udp_connect(pcb, ipX_2_ip(&xfer->peer_ip), xfer->peer_port); + if (error != ERR_OK) { + udp_remove(pcb); + pcb = NULL; + } + } + + if (pcb == NULL) { + if (report_transient_errors) { + tftp_error(xfer, TFTP_EUNDEF, "Failed to create connection"); + } + return -1; + } + + xfer->pcb = pcb; + udp_recv(xfer->pcb, tftp_xfer_recv, xfer); + + return 0; +} + + +static void +tftp_xfer_free(struct xfer *xfer) +{ + sys_untimeout(tftp_timeout, xfer); + + if (xfer->pcb != NULL) { + udp_remove(xfer->pcb); + xfer->pcb = NULL; + } + + if (xfer->fd > 0) { + close(xfer->fd); + xfer->fd = -1; + } + + if (xfer->oack != NULL) { + pbuf_free(xfer->oack); + xfer->oack = NULL; + } + + if (xfer->pbuf != NULL) { + pbuf_free(xfer->pbuf); + xfer->pbuf = NULL; + } + + if (xfer->filename != NULL) { + free(xfer->filename); + xfer->filename = NULL; + } +} + + +static int +tftp_parse_filename(struct xfer *xfer, char **ps, size_t *plen) +{ + const char *filename; + struct stat st; + char *pathname; + char *s; + size_t len; + int status; + + filename = tftp_getstr(xfer, "filename", ps, plen); + if (filename == NULL) { + return -1; + } + + DPRINTF(("%s: requested file name: %s\n", __func__, filename)); + xfer->filename = strdup(filename); + if (xfer->filename == NULL) { + return tftp_internal_error(xfer); + } + + /* replace backslashes with forward slashes */ + s = xfer->filename; + while ((s = strchr(s, '\\')) != NULL) { + *s++ = '/'; + } + + /* deny attempts to break out of tftp dir */ + if (strncmp(xfer->filename, "../", 3) == 0 + || strstr(xfer->filename, "/../") != NULL) + { + return tftp_error(xfer, TFTP_ENOENT, "Permission denied"); + } + + len = strlen(tftpd.root) + 1 /*slash*/ + strlen(xfer->filename) + 1 /*nul*/; + pathname = (char *)malloc(len); + if (pathname == NULL) { + return tftp_internal_error(xfer); + } + + RTStrPrintf(pathname, len, "%s/%s", tftpd.root, xfer->filename); +/** @todo fix RTStrPrintf because this does not currently work: + * status = RTStrPrintf(pathname, len, "%s/%s", tftpd.root, xfer->filename); + * if (status < 0) { + * return tftp_internal_error(xfer); + * } + */ + + DPRINTF(("%s: full pathname: %s\n", __func__, pathname)); + xfer->fd = open(pathname, O_RDONLY); + if (xfer->fd < 0) { + if (errno == EPERM) { + return tftp_error(xfer, TFTP_ENOENT, "Permission denied"); + } + else { + return tftp_error(xfer, TFTP_ENOENT, "File not found"); + } + } + + status = fstat(xfer->fd, &st); + if (status < 0) { + return tftp_internal_error(xfer); + } + + if (!S_ISREG(st.st_mode)) { + return tftp_error(xfer, TFTP_ENOENT, "File not found"); + } + + xfer->tsize = st.st_size; + return 0; +} + + +static int +tftp_parse_mode(struct xfer *xfer, char **ps, size_t *plen) +{ + const char *modename; + + modename = tftp_getstr(xfer, "mode", ps, plen); + if (modename == NULL) { + return -1; + } + + if (RTStrICmp(modename, "octet") == 0) { + xfer->octet = 1; + } + else if (RTStrICmp(modename, "netascii") == 0) { + xfer->octet = 0; + /* XXX: not (yet?) */ + return tftp_error(xfer, TFTP_ENOSYS, "Mode \"netascii\" not supported"); + } + else if (RTStrICmp(modename, "mail") == 0) { + return tftp_error(xfer, TFTP_ENOSYS, "Mode \"mail\" not supported"); + } + else { + return tftp_error(xfer, TFTP_ENOSYS, "Unknown mode \"%s\"", modename); + } + + return 0; +} + + +static int +tftp_parse_option(struct xfer *xfer, char **ps, size_t *plen) +{ + const char *opt; + const char *val; + struct tftp_option *o; + + opt = tftp_getstr(xfer, "option name", ps, plen); + if (opt == NULL) { + return -1; + } + + if (*plen == 0) { + return tftp_error(xfer, TFTP_EUNDEF, "Missing option value"); + } + + val = tftp_getstr(xfer, "option value", ps, plen); + if (val == NULL) { + return -1; + } + + /* handle option if known, ignore otherwise */ + for (o = &tftp_options[0]; o->name != NULL; ++o) { + if (RTStrICmp(o->name, opt) == 0) { + return (*o->getopt)(xfer, val); + } + } + + return 0; /* unknown option */ +} + + +static int +tftp_opt_blksize(struct xfer *xfer, const char *optval) +{ + char *end; + long blksize; + + errno = 0; + blksize = strtol(optval, &end, 10); + if (errno != 0 || *end != '\0') { + return 0; + } + + if (blksize < 8) { + return 0; + } + + if (blksize > 1428) { /* exceeds ethernet mtu */ + blksize = 1428; + } + + xfer->blksize = blksize; + xfer->blksize_from_opt = 1; + return 1; +} + + +static int +tftp_opt_timeout(struct xfer *xfer, const char *optval) +{ + LWIP_UNUSED_ARG(xfer); + LWIP_UNUSED_ARG(optval); + return 0; +} + + +static int +tftp_opt_tsize(struct xfer *xfer, const char *optval) +{ + LWIP_UNUSED_ARG(optval); /* must be "0", but we don't check it */ + + if (xfer->tsize < 0) { + return 0; + } + + xfer->tsize_from_opt = 1; + return 1; +} + + +static char * +tftp_getstr(struct xfer *xfer, const char *msg, char **ps, size_t *plen) +{ + char *s; + ssize_t slen; + + s = *ps; + slen = tftp_strnlen(s, *plen); + if (slen < 0) { + tftp_error(xfer, TFTP_EUNDEF, "Unterminated %s", msg); + return NULL; + } + + *ps += slen + 1; + *plen -= slen + 1; + + return s; +} + + +static int +tftp_ack_blksize(struct xfer *xfer, char **ps, size_t *plen) +{ + if (!xfer->blksize_from_opt) { + return 0; + } + + return tftp_add_oack(ps, plen, "blksize", "%u", xfer->blksize); +} + + +static int +tftp_ack_timeout(struct xfer *xfer, char **ps, size_t *plen) +{ + if (!xfer->timeout_from_opt) { + return 0; + } + + return tftp_add_oack(ps, plen, "timeout", "%u", xfer->timeout); +} + + +static int +tftp_ack_tsize(struct xfer *xfer, char **ps, size_t *plen) +{ + if (!xfer->tsize_from_opt) { + return 0; + } + + LWIP_ASSERT1(xfer->tsize >= 0); + return tftp_add_oack(ps, plen, "tsize", + /* XXX: FIXME: want 64 bit */ + "%lu", (unsigned long)xfer->tsize); +} + + +static int +tftp_add_oack(char **ps, size_t *plen, + const char *optname, const char *fmt, ...) +{ + va_list ap; + int sz; + +/** @todo Fix RTStrPrintf because this doesn't really work. + * sz = RTStrPrintf(*ps, *plen, "%s", optname); + * if (sz < 0 || (size_t)sz >= *plen) { + * return -1; + * } */ + sz = (int)RTStrPrintf(*ps, *plen, "%s", optname); + if (/*sz < 0 ||*/ (size_t)sz >= *plen) { + return -1; + } + + ++sz; /* for nul byte */ + *ps += sz; + *plen -= sz; + + va_start(ap, fmt); + sz = vsnprintf(*ps, *plen, fmt, ap); + va_end(ap); + if (sz < 0 || (size_t)sz >= *plen) { + return -1; + } + + ++sz; /* for nul byte */ + *ps += sz; + *plen -= sz; + + return 0; +} + + +static ssize_t +tftp_strnlen(char *buf, size_t bufsize) +{ + void *end; + + end = memchr(buf, '\0', bufsize); + if (end == NULL) { + return -1; + } + + return (char *)end - buf; +} + + +static int +tftp_internal_error(struct xfer *xfer) +{ + if (report_transient_errors) { + tftp_error(xfer, TFTP_EUNDEF, "Internal error"); + } + return -1; +} + + +/** + * Send an error packet to the peer. + * + * PCB may not be created yet in which case send the error packet from + * the TFTP server port (*). + * + * (*) We delay creation of the PCB in response to the original + * request until the request is verified and accepted. This makes + * using tcpdump(8) easier, since tcpdump does not track TFTP + * transfers, so an error reply from a new PCB is not recognized as + * such and is not decoded as TFTP. + * + * Always returns -1 for callers to reuse. + */ +static int +tftp_error(struct xfer *xfer, u16_t error, const char *fmt, ...) +{ + va_list ap; + struct pbuf *q; + + LWIP_ASSERT1(xfer != NULL); + + va_start(ap, fmt); + q = tftp_verror(error, fmt, ap); + va_end(ap); + + if (q == NULL) { + return -1; + } + + if (xfer->pcb != NULL) { + udp_send(xfer->pcb, q); + } + else { + udp_sendto(tftpd.pcb, q, ipX_2_ip(&xfer->peer_ip), xfer->peer_port); + } + + pbuf_free(q); + return -1; +} + + +/** + * Send an error packet from TFTP server port to the specified peer. + */ +static void +tftpd_error(ip_addr_t *addr, u16_t port, u16_t error, const char *fmt, ...) +{ + va_list ap; + struct pbuf *q; + + va_start(ap, fmt); + q = tftp_verror(error, fmt, ap); + va_end(ap); + + if (q != NULL) { + udp_sendto(tftpd.pcb, q, addr, port); + pbuf_free(q); + } +} + + +/** + * Create ERROR pbuf with formatted error message. + */ +static struct pbuf * +tftp_verror(u16_t error, const char *fmt, va_list ap) +{ + struct tftp_error { + u16_t opcode; /* TFTP_ERROR */ + u16_t errcode; + char errmsg[512]; + }; + + struct pbuf *p; + struct tftp_error *errpkt; + int msgsz; + + p = pbuf_alloc(PBUF_TRANSPORT, sizeof(*errpkt), PBUF_RAM); + if (p == NULL) { + return NULL; + } + + errpkt = (struct tftp_error *)p->payload; + errpkt->opcode = PP_HTONS(TFTP_ERROR); + errpkt->errcode = htons(error); + + msgsz = vsnprintf(errpkt->errmsg, sizeof(errpkt->errmsg), fmt, ap); + if (msgsz < 0) { + errpkt->errmsg[0] = '\0'; + msgsz = 1; + } + else if ((size_t)msgsz < sizeof(errpkt->errmsg)) { + ++msgsz; /* for nul byte */ + } + else { + msgsz = sizeof(errpkt->errmsg); /* truncated, includes nul byte */ + } + + pbuf_realloc(p, sizeof(*errpkt) - sizeof(errpkt->errmsg) + msgsz); + return p; +} diff --git a/src/VBox/NetworkServices/NAT/pxdns.c b/src/VBox/NetworkServices/NAT/pxdns.c new file mode 100644 index 00000000..5e98824a --- /dev/null +++ b/src/VBox/NetworkServices/NAT/pxdns.c @@ -0,0 +1,942 @@ +/* $Id: pxdns.c $ */ +/** @file + * NAT Network - DNS proxy. + */ + +/* + * Copyright (C) 2009-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +/* + * Copyright (c) 2003,2004,2005 Armin Wolfermann + * + * 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. + */ +#define LOG_GROUP LOG_GROUP_NAT_SERVICE + +#include "winutils.h" + +#include "proxy.h" +#include "proxy_pollmgr.h" +#include "pxtcp.h" + +#include "lwip/sys.h" +#include "lwip/tcpip.h" +#include "lwip/ip_addr.h" +#include "lwip/udp.h" +#include "lwip/tcp.h" + +#ifndef RT_OS_WINDOWS +#include <sys/poll.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <netdb.h> +#else +#include "winpoll.h" +#endif + +#include <stdio.h> +#include <string.h> + + +union sockaddr_inet { + struct sockaddr sa; + struct sockaddr_in sin; + struct sockaddr_in6 sin6; +}; + + +struct request; + + +/** + * DNS Proxy + */ +struct pxdns { + SOCKET sock4; + SOCKET sock6; + + struct pollmgr_handler pmhdl4; + struct pollmgr_handler pmhdl6; + + struct udp_pcb *pcb4; + struct udp_pcb *pcb6; + + struct tcp_pcb *ltcp; + + size_t generation; + size_t nresolvers; + union sockaddr_inet *resolvers; + + u16_t id; + + sys_mutex_t lock; + + size_t active_queries; + size_t expired_queries; + size_t late_answers; + size_t hash_collisions; + +#define TIMEOUT 5 + size_t timeout_slot; + u32_t timeout_mask; + struct request *timeout_list[TIMEOUT]; + +#define HASHSIZE 10 +#define HASH(id) ((id) & ((1 << HASHSIZE) - 1)) + struct request *request_hash[1 << HASHSIZE]; +} g_pxdns; + + +struct request { + /** + * Request ID that we use in relayed request. + */ + u16_t id; + + /** + * pxdns::generation used for this request + */ + size_t generation; + + /** + * Current index into pxdns::resolvers + */ + size_t residx; + + /** + * PCB from which we have received this request. lwIP doesn't + * support listening for both IPv4 and IPv6 on the same pcb, so we + * use two and need to keep track. + */ + struct udp_pcb *pcb; + + /** + * Client this request is from and its original request ID. + */ + ipX_addr_t client_addr; + u16_t client_port; + u16_t client_id; + + /** + * Chaining for pxdns::request_hash + */ + struct request **pprev_hash; + struct request *next_hash; + + /** + * Chaining for pxdns::timeout_list + */ + struct request **pprev_timeout; + struct request *next_timeout; + + /** + * Slot in pxdns::timeout_list + */ + size_t timeout_slot; + + /** + * Pbuf with reply received on pollmgr thread. + */ + struct pbuf *reply; + + /** + * Preallocated lwIP message to send reply from the lwIP thread. + */ + struct tcpip_msg msg_reply; + + /** + * Client request. ID is replaced with ours, original saved in + * client_id. Use a copy since we might need to resend and we + * don't want to hold onto pbuf of the request. + */ + size_t size; + u8_t data[1]; +}; + + +static void pxdns_create_resolver_sockaddrs(struct pxdns *pxdns, + const char **nameservers); + +static err_t pxdns_accept_syn(void *arg, struct tcp_pcb *newpcb, struct pbuf *syn); + +static void pxdns_recv4(void *arg, struct udp_pcb *pcb, struct pbuf *p, + ip_addr_t *addr, u16_t port); +static void pxdns_recv6(void *arg, struct udp_pcb *pcb, struct pbuf *p, + ip6_addr_t *addr, u16_t port); +static void pxdns_query(struct pxdns *pxdns, struct udp_pcb *pcb, struct pbuf *p, + ipX_addr_t *addr, u16_t port); +static void pxdns_timer(void *arg); +static int pxdns_rexmit(struct pxdns *pxdns, struct request *req); +static int pxdns_forward_outbound(struct pxdns *pxdns, struct request *req); + +static int pxdns_pmgr_pump(struct pollmgr_handler *handler, SOCKET fd, int revents); +static void pxdns_pcb_reply(void *ctx); + +static void pxdns_request_register(struct pxdns *pxdns, struct request *req); +static void pxdns_request_deregister(struct pxdns *pxdns, struct request *req); +static struct request *pxdns_request_find(struct pxdns *pxdns, u16_t id); + +static void pxdns_hash_add(struct pxdns *pxdns, struct request *req); +static void pxdns_hash_del(struct pxdns *pxdns, struct request *req); +static void pxdns_timeout_add(struct pxdns *pxdns, struct request *req); +static void pxdns_timeout_del(struct pxdns *pxdns, struct request *req); + +static void pxdns_request_free(struct request *req); + + +err_t +pxdns_init(struct netif *proxy_netif) +{ + struct pxdns *pxdns = &g_pxdns; + err_t error; + + LWIP_UNUSED_ARG(proxy_netif); + + pxdns->ltcp = tcp_new(); + if (pxdns->ltcp != NULL) { + tcp_bind_ip6(pxdns->ltcp, IP6_ADDR_ANY, 53); + pxdns->ltcp = tcp_listen_dual(pxdns->ltcp); + if (pxdns->ltcp != NULL) { + tcp_arg(pxdns->ltcp, pxdns); + tcp_accept_syn(pxdns->ltcp, pxdns_accept_syn); + } + } + + pxdns->pmhdl4.callback = pxdns_pmgr_pump; + pxdns->pmhdl4.data = (void *)pxdns; + pxdns->pmhdl4.slot = -1; + + pxdns->pmhdl6.callback = pxdns_pmgr_pump; + pxdns->pmhdl6.data = (void *)pxdns; + pxdns->pmhdl6.slot = -1; + + pxdns->pcb4 = udp_new(); + if (pxdns->pcb4 == NULL) { + error = ERR_MEM; + goto err_cleanup_pcb; + } + + pxdns->pcb6 = udp_new_ip6(); + if (pxdns->pcb6 == NULL) { + error = ERR_MEM; + goto err_cleanup_pcb; + } + + error = udp_bind(pxdns->pcb4, IP_ADDR_ANY, 53); + if (error != ERR_OK) { + goto err_cleanup_pcb; + } + + error = udp_bind_ip6(pxdns->pcb6, IP6_ADDR_ANY, 53); + if (error != ERR_OK) { + goto err_cleanup_pcb; + } + + udp_recv(pxdns->pcb4, pxdns_recv4, pxdns); + udp_recv_ip6(pxdns->pcb6, pxdns_recv6, pxdns); + + pxdns->sock4 = socket(AF_INET, SOCK_DGRAM, 0); + if (pxdns->sock4 == INVALID_SOCKET) { + goto err_cleanup_pcb; + } + + pxdns->sock6 = socket(AF_INET6, SOCK_DGRAM, 0); + if (pxdns->sock6 == INVALID_SOCKET) { + /* it's ok if the host doesn't support IPv6 */ + /* XXX: TODO: log */ + } + + pxdns->generation = 0; + pxdns->nresolvers = 0; + pxdns->resolvers = NULL; + pxdns_create_resolver_sockaddrs(pxdns, g_proxy_options->nameservers); + + sys_mutex_new(&pxdns->lock); + + pxdns->timeout_slot = 0; + pxdns->timeout_mask = 0; + + /* NB: assumes pollmgr thread is not running yet */ + pollmgr_add(&pxdns->pmhdl4, pxdns->sock4, POLLIN); + if (pxdns->sock6 != INVALID_SOCKET) { + pollmgr_add(&pxdns->pmhdl6, pxdns->sock6, POLLIN); + } + + return ERR_OK; + + err_cleanup_pcb: + if (pxdns->pcb4 != NULL) { + udp_remove(pxdns->pcb4); + pxdns->pcb4 = NULL; + } + if (pxdns->pcb6 != NULL) { + udp_remove(pxdns->pcb6); + pxdns->pcb4 = NULL; + } + + return error; +} + + +/** + * lwIP thread callback to set the new list of nameservers. + */ +void +pxdns_set_nameservers(void *arg) +{ + const char **nameservers = (const char **)arg; + + if (g_proxy_options->nameservers != NULL) { + RTMemFree((void *)g_proxy_options->nameservers); + } + g_proxy_options->nameservers = nameservers; + + pxdns_create_resolver_sockaddrs(&g_pxdns, nameservers); +} + + +/** + * Use this list of nameservers to resolve guest requests. + * + * Runs on lwIP thread, so no new queries or retramsmits compete with + * it for the use of the existing list of resolvers (to be replaced). + */ +static void +pxdns_create_resolver_sockaddrs(struct pxdns *pxdns, const char **nameservers) +{ + struct addrinfo hints; + union sockaddr_inet *resolvers; + size_t nnames, nresolvers; + const char **p; + int status; + + resolvers = NULL; + nresolvers = 0; + + if (nameservers == NULL) { + goto update_resolvers; + } + + nnames = 0; + for (p = nameservers; *p != NULL; ++p) { + ++nnames; + } + + if (nnames == 0) { + goto update_resolvers; + } + + resolvers = (union sockaddr_inet *)calloc(sizeof(resolvers[0]), nnames); + if (resolvers == NULL) { + nresolvers = 0; + goto update_resolvers; + } + + memset(&hints, 0, sizeof(hints)); + hints.ai_family = AF_UNSPEC; + hints.ai_socktype = SOCK_DGRAM; + hints.ai_flags = AI_NUMERICHOST | AI_NUMERICSERV; + + for (p = nameservers; *p != NULL; ++p) { + const char *name = *p; + struct addrinfo *ai; + status = getaddrinfo(name, /* "domain" */ "53", &hints, &ai); + if (status != 0) { + /* XXX: log failed resolution */ + continue; + } + + if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) { + /* XXX: log unsupported address family */ + freeaddrinfo(ai); + continue; + } + + if (ai->ai_addrlen > sizeof(resolvers[nresolvers])) { + /* XXX: log */ + freeaddrinfo(ai); + continue; + } + + if (ai->ai_family == AF_INET6 && pxdns->sock6 == INVALID_SOCKET) { + /* no IPv6 support on the host, can't use this resolver */ + freeaddrinfo(ai); + continue; + } + + memcpy(&resolvers[nresolvers], ai->ai_addr, ai->ai_addrlen); + freeaddrinfo(ai); + ++nresolvers; + } + + if (nresolvers == 0) { + if (resolvers != NULL) { + free(resolvers); + } + resolvers = NULL; + } + + update_resolvers: + ++pxdns->generation; + if (pxdns->resolvers != NULL) { + free(pxdns->resolvers); + } + pxdns->resolvers = resolvers; + pxdns->nresolvers = nresolvers; +} + + +static void +pxdns_request_free(struct request *req) +{ + LWIP_ASSERT1(req->pprev_hash == NULL); + LWIP_ASSERT1(req->pprev_timeout == NULL); + + if (req->reply != NULL) { + pbuf_free(req->reply); + } + free(req); +} + + +static void +pxdns_hash_add(struct pxdns *pxdns, struct request *req) +{ + struct request **chain; + + LWIP_ASSERT1(req->pprev_hash == NULL); + ++pxdns->active_queries; + + chain = &pxdns->request_hash[HASH(req->id)]; + if ((req->next_hash = *chain) != NULL) { + (*chain)->pprev_hash = &req->next_hash; + ++pxdns->hash_collisions; + } + *chain = req; + req->pprev_hash = chain; +} + + +static void +pxdns_timeout_add(struct pxdns *pxdns, struct request *req) +{ + struct request **chain; + u32_t omask; + + LWIP_ASSERT1(req->pprev_timeout == NULL); + + req->timeout_slot = pxdns->timeout_slot; + chain = &pxdns->timeout_list[req->timeout_slot]; + if ((req->next_timeout = *chain) != NULL) { + (*chain)->pprev_timeout = &req->next_timeout; + } + *chain = req; + req->pprev_timeout = chain; + + omask = pxdns->timeout_mask; + pxdns->timeout_mask |= 1U << req->timeout_slot; + if (omask == 0) { + sys_untimeout(pxdns_timer, pxdns); + sys_timeout(1 * 1000, pxdns_timer, pxdns); + } +} + + +static void +pxdns_hash_del(struct pxdns *pxdns, struct request *req) +{ + LWIP_ASSERT1(req->pprev_hash != NULL); + --pxdns->active_queries; + + if (req->next_hash != NULL) { + req->next_hash->pprev_hash = req->pprev_hash; + } + *req->pprev_hash = req->next_hash; + req->pprev_hash = NULL; + req->next_hash = NULL; +} + + +static void +pxdns_timeout_del(struct pxdns *pxdns, struct request *req) +{ + LWIP_ASSERT1(req->pprev_timeout != NULL); + LWIP_ASSERT1(req->timeout_slot < TIMEOUT); + + if (req->next_timeout != NULL) { + req->next_timeout->pprev_timeout = req->pprev_timeout; + } + *req->pprev_timeout = req->next_timeout; + req->pprev_timeout = NULL; + req->next_timeout = NULL; + + if (pxdns->timeout_list[req->timeout_slot] == NULL) { + pxdns->timeout_mask &= ~(1U << req->timeout_slot); + /* may be on pollmgr thread so no sys_untimeout */ + } +} + + + +/** + * Do bookkeeping on new request. Called from pxdns_query(). + */ +static void +pxdns_request_register(struct pxdns *pxdns, struct request *req) +{ + sys_mutex_lock(&pxdns->lock); + + pxdns_hash_add(pxdns, req); + pxdns_timeout_add(pxdns, req); + + sys_mutex_unlock(&pxdns->lock); +} + + +static void +pxdns_request_deregister(struct pxdns *pxdns, struct request *req) +{ + sys_mutex_lock(&pxdns->lock); + + pxdns_hash_del(pxdns, req); + pxdns_timeout_del(pxdns, req); + + sys_mutex_unlock(&pxdns->lock); +} + + +/** + * Find request by the id we used when relaying it and remove it from + * id hash and timeout list. Called from pxdns_pmgr_pump() when reply + * comes. + */ +static struct request * +pxdns_request_find(struct pxdns *pxdns, u16_t id) +{ + struct request *req = NULL; + + sys_mutex_lock(&pxdns->lock); + + /* find request in the id->req hash */ + for (req = pxdns->request_hash[HASH(id)]; req != NULL; req = req->next_hash) { + if (req->id == id) { + break; + } + } + + if (req != NULL) { + pxdns_hash_del(pxdns, req); + pxdns_timeout_del(pxdns, req); + } + + sys_mutex_unlock(&pxdns->lock); + return req; +} + + +/** + * Retransmit of g/c expired requests and move timeout slot forward. + */ +static void +pxdns_timer(void *arg) +{ + struct pxdns *pxdns = (struct pxdns *)arg; + struct request **chain, *req; + u32_t mask; + + sys_mutex_lock(&pxdns->lock); + + /* + * Move timeout slot first. New slot points to the list of + * expired requests. If any expired request is retransmitted, we + * keep it on the list (that is now current), effectively + * resetting the timeout. + */ + LWIP_ASSERT1(pxdns->timeout_slot < TIMEOUT); + if (++pxdns->timeout_slot == TIMEOUT) { + pxdns->timeout_slot = 0; + } + + chain = &pxdns->timeout_list[pxdns->timeout_slot]; + req = *chain; + while (req != NULL) { + struct request *expired = req; + req = req->next_timeout; + + if (pxdns_rexmit(pxdns, expired)) { + continue; + } + + pxdns_hash_del(pxdns, expired); + pxdns_timeout_del(pxdns, expired); + ++pxdns->expired_queries; + + pxdns_request_free(expired); + } + + if (pxdns->timeout_list[pxdns->timeout_slot] == NULL) { + pxdns->timeout_mask &= ~(1U << pxdns->timeout_slot); + } + else { + pxdns->timeout_mask |= 1U << pxdns->timeout_slot; + } + mask = pxdns->timeout_mask; + + sys_mutex_unlock(&pxdns->lock); + + if (mask != 0) { + sys_timeout(1 * 1000, pxdns_timer, pxdns); + } +} + + +static void +pxdns_recv4(void *arg, struct udp_pcb *pcb, struct pbuf *p, + ip_addr_t *addr, u16_t port) +{ + struct pxdns *pxdns = (struct pxdns *)arg; + pxdns_query(pxdns, pcb, p, ip_2_ipX(addr), port); +} + +static void +pxdns_recv6(void *arg, struct udp_pcb *pcb, struct pbuf *p, + ip6_addr_t *addr, u16_t port) +{ + struct pxdns *pxdns = (struct pxdns *)arg; + pxdns_query(pxdns, pcb, p, ip6_2_ipX(addr), port); +} + + +static void +pxdns_query(struct pxdns *pxdns, struct udp_pcb *pcb, struct pbuf *p, + ipX_addr_t *addr, u16_t port) +{ + struct request *req; + int sent; + + if (pxdns->nresolvers == 0) { + /* nothing we can do */ + pbuf_free(p); + return; + } + + req = calloc(1, sizeof(struct request) - 1 + p->tot_len); + if (req == NULL) { + pbuf_free(p); + return; + } + + /* copy request data */ + req->size = p->tot_len; + pbuf_copy_partial(p, req->data, p->tot_len, 0); + + /* save client identity and client's request id */ + req->pcb = pcb; + ipX_addr_copy(PCB_ISIPV6(pcb), req->client_addr, *addr); + req->client_port = port; + memcpy(&req->client_id, req->data, sizeof(req->client_id)); + + /* slap our request id onto it */ + req->id = pxdns->id++; + memcpy(req->data, &req->id, sizeof(u16_t)); + + /* resolver to forward to */ + req->generation = pxdns->generation; + req->residx = 0; + + /* prepare for relaying the reply back to guest */ + req->msg_reply.type = TCPIP_MSG_CALLBACK_STATIC; + req->msg_reply.sem = NULL; + req->msg_reply.msg.cb.function = pxdns_pcb_reply; + req->msg_reply.msg.cb.ctx = (void *)req; + + DPRINTF2(("%s: req=%p: client id %d -> id %d\n", + __func__, (void *)req, req->client_id, req->id)); + + pxdns_request_register(pxdns, req); + + sent = pxdns_forward_outbound(pxdns, req); + if (!sent) { + sent = pxdns_rexmit(pxdns, req); + } + if (!sent) { + pxdns_request_deregister(pxdns, req); + pxdns_request_free(req); + } +} + + +/** + * Forward request to the req::residx resolver in the pxdns::resolvers + * array of upstream resolvers. + * + * Returns 1 on success, 0 on failure. + */ +static int +pxdns_forward_outbound(struct pxdns *pxdns, struct request *req) +{ + union sockaddr_inet *resolver; + ssize_t nsent; +#ifdef RT_OS_WINDOWS + const char *pSendData = (const char *)&req->data[0]; + int cbSendData = (int)req->size; + Assert((size_t)cbSendData == req->size); +#else + const void *pSendData = &req->data[0]; + size_t cbSendData = req->size; +#endif + + DPRINTF2(("%s: req %p: sending to resolver #%lu\n", + __func__, (void *)req, (unsigned long)req->residx)); + + LWIP_ASSERT1(req->generation == pxdns->generation); + LWIP_ASSERT1(req->residx < pxdns->nresolvers); + resolver = &pxdns->resolvers[req->residx]; + + if (resolver->sa.sa_family == AF_INET) { + nsent = sendto(pxdns->sock4, pSendData, cbSendData, 0, + &resolver->sa, sizeof(resolver->sin)); + + } + else if (resolver->sa.sa_family == AF_INET6) { + if (pxdns->sock6 != INVALID_SOCKET) { + nsent = sendto(pxdns->sock6, pSendData, cbSendData, 0, + &resolver->sa, sizeof(resolver->sin6)); + } + else { + /* shouldn't happen, we should have weeded out IPv6 resolvers */ + return 0; + } + } + else { + /* shouldn't happen, we should have weeded out unsupported families */ + return 0; + } + + if ((size_t)nsent == req->size) { + return 1; /* sent */ + } + + if (nsent < 0) { + DPRINTF2(("%s: send: %R[sockerr]\n", __func__, SOCKERRNO())); + } + else { + DPRINTF2(("%s: sent only %lu of %lu\n", + __func__, (unsigned long)nsent, (unsigned long)req->size)); + } + return 0; /* not sent, caller will retry as necessary */ +} + + +/** + * Forward request to the next resolver in the pxdns::resolvers array + * of upstream resolvers if there are any left. + */ +static int +pxdns_rexmit(struct pxdns *pxdns, struct request *req) +{ + int sent; + + if (/* __predict_false */ req->generation != pxdns->generation) { + DPRINTF2(("%s: req %p: generation %lu != pxdns generation %lu\n", + __func__, (void *)req, + (unsigned long)req->generation, + (unsigned long)pxdns->generation)); + return 0; + } + + LWIP_ASSERT1(req->residx < pxdns->nresolvers); + do { + if (++req->residx == pxdns->nresolvers) { + return 0; + } + + sent = pxdns_forward_outbound(pxdns, req); + } while (!sent); + + return 1; +} + + +static int +pxdns_pmgr_pump(struct pollmgr_handler *handler, SOCKET fd, int revents) +{ + struct pxdns *pxdns; + struct request *req; + ssize_t nread; + err_t error; + u16_t id; + + pxdns = (struct pxdns *)handler->data; + LWIP_ASSERT1(handler == &pxdns->pmhdl4 || handler == &pxdns->pmhdl6); + LWIP_ASSERT1(fd == (handler == &pxdns->pmhdl4 ? pxdns->sock4 : pxdns->sock6)); + + if (revents & ~(POLLIN|POLLERR)) { + DPRINTF0(("%s: unexpected revents 0x%x\n", __func__, revents)); + return POLLIN; + } + + if (revents & POLLERR) { + int sockerr = -1; + socklen_t optlen = (socklen_t)sizeof(sockerr); + int status; + + status = getsockopt(fd, SOL_SOCKET, + SO_ERROR, (char *)&sockerr, &optlen); + if (status < 0) { + DPRINTF(("%s: sock %d: SO_ERROR failed: %R[sockerr]\n", + __func__, fd, SOCKERRNO())); + } + else { + DPRINTF(("%s: sock %d: %R[sockerr]\n", + __func__, fd, sockerr)); + } + } + + if ((revents & POLLIN) == 0) { + return POLLIN; + } + + +#ifdef RT_OS_WINDOWS + nread = recv(fd, (char *)pollmgr_udpbuf, sizeof(pollmgr_udpbuf), 0); +#else + nread = recv(fd, pollmgr_udpbuf, sizeof(pollmgr_udpbuf), 0); +#endif + if (nread < 0) { + DPRINTF(("%s: %R[sockerr]\n", __func__, SOCKERRNO())); + return POLLIN; + } + + /* check for minimum dns packet length */ + if (nread < 12) { + DPRINTF2(("%s: short reply %lu bytes\n", + __func__, (unsigned long)nread)); + return POLLIN; + } + + /* XXX: shall we proxy back RCODE=Refused responses? */ + + memcpy(&id, pollmgr_udpbuf, sizeof(id)); + req = pxdns_request_find(pxdns, id); + if (req == NULL) { + DPRINTF2(("%s: orphaned reply for %d\n", __func__, id)); + ++pxdns->late_answers; + return POLLIN; + } + + DPRINTF2(("%s: reply for req=%p: id %d -> client id %d\n", + __func__, (void *)req, req->id, req->client_id)); + + req->reply = pbuf_alloc(PBUF_RAW, nread, PBUF_RAM); + if (req->reply == NULL) { + DPRINTF(("%s: pbuf_alloc(%d) failed\n", __func__, (int)nread)); + pxdns_request_free(req); + return POLLIN; + } + + memcpy(pollmgr_udpbuf, &req->client_id, sizeof(req->client_id)); + error = pbuf_take(req->reply, pollmgr_udpbuf, nread); + if (error != ERR_OK) { + DPRINTF(("%s: pbuf_take(%d) failed\n", __func__, (int)nread)); + pxdns_request_free(req); + return POLLIN; + } + + proxy_lwip_post(&req->msg_reply); + return POLLIN; +} + + +/** + * Called on lwIP thread via request::msg_reply callback. + */ +static void +pxdns_pcb_reply(void *ctx) +{ + struct request *req = (struct request *)ctx; + err_t error; + + error = udp_sendto(req->pcb, req->reply, + ipX_2_ip(&req->client_addr), req->client_port); + if (error != ERR_OK) { + DPRINTF(("%s: udp_sendto err %s\n", + __func__, proxy_lwip_strerr(error))); + } + + pxdns_request_free(req); +} + + +/** + * TCP DNS proxy. This kicks in for large replies that don't fit into + * 512 bytes of UDP payload. Client will retry with TCP to get + * complete reply. + */ +static err_t +pxdns_accept_syn(void *arg, struct tcp_pcb *newpcb, struct pbuf *syn) +{ + struct pxdns *pxdns = (struct pxdns *)arg; + union sockaddr_inet *si; + ipX_addr_t *dst; + u16_t dst_port; + + tcp_accepted(pxdns->ltcp); + + if (pxdns->nresolvers == 0) { + return ERR_CONN; + } + + si = &pxdns->resolvers[0]; + + if (si->sa.sa_family == AF_INET6) { + dst = (ipX_addr_t *)&si->sin6.sin6_addr; + dst_port = ntohs(si->sin6.sin6_port); + } + else { + dst = (ipX_addr_t *)&si->sin.sin_addr; + dst_port = ntohs(si->sin.sin_port); + } + + /* + * XXX: TODO: need to implement protocol hooks. E.g. here if + * connect fails, we should try connecting to a different server. + */ + return pxtcp_pcb_accept_outbound(newpcb, syn, + si->sa.sa_family == AF_INET6, dst, dst_port); +} diff --git a/src/VBox/NetworkServices/NAT/pxping.c b/src/VBox/NetworkServices/NAT/pxping.c new file mode 100644 index 00000000..9acee074 --- /dev/null +++ b/src/VBox/NetworkServices/NAT/pxping.c @@ -0,0 +1,2020 @@ +/* $Id: pxping.c $ */ +/** @file + * NAT Network - ping proxy, raw sockets version. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#define LOG_GROUP LOG_GROUP_NAT_SERVICE + +#include "winutils.h" +#include "proxy.h" +#include "proxy_pollmgr.h" +#include "pxremap.h" + +#include <iprt/string.h> + +#ifndef RT_OS_WINDOWS +#include <sys/types.h> +#include <sys/socket.h> +#ifdef RT_OS_DARWIN +# define __APPLE_USE_RFC_3542 +#endif +#include <netinet/in.h> +#include <poll.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#else +#include <iprt/stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include "winpoll.h" +#endif + +#include "lwip/opt.h" + +#include "lwip/sys.h" +#include "lwip/tcpip.h" +#include "lwip/inet_chksum.h" +#include "lwip/ip.h" +#include "lwip/icmp.h" + +#if defined(RT_OS_LINUX) && !defined(__USE_GNU) +#if __GLIBC_PREREQ(2, 8) +/* + * XXX: This is gross. in6_pktinfo is now hidden behind _GNU_SOURCE + * https://sourceware.org/bugzilla/show_bug.cgi?id=6775 + * + * But in older glibc versions, e.g. RHEL5, it is not! I don't want + * to deal with _GNU_SOURCE now, so as a kludge check for glibc + * version. It seems the __USE_GNU guard was introduced in 2.8. + */ +struct in6_pktinfo { + struct in6_addr ipi6_addr; + unsigned int ipi6_ifindex; +}; +#endif /* __GLIBC_PREREQ */ +#endif /* RT_OS_LINUX && !__USE_GNU */ + + +/* forward */ +struct ping_pcb; + + +/** + * Global state for ping proxy collected in one entity to minimize + * globals. There's only one instance of this structure. + * + * Raw ICMP sockets are promiscuous, so it doesn't make sense to have + * multiple. If this code ever needs to support multiple netifs, the + * netif member should be exiled into "pcb". + */ +struct pxping { + SOCKET sock4; + +#if defined(RT_OS_DARWIN) || defined(RT_OS_SOLARIS) +# define DF_WITH_IP_HDRINCL + int hdrincl; +#else + int df; +#endif + int ttl; + int tos; + + SOCKET sock6; +#ifdef RT_OS_WINDOWS + LPFN_WSARECVMSG pfWSARecvMsg6; +#endif + int hopl; + + struct pollmgr_handler pmhdl4; + struct pollmgr_handler pmhdl6; + + struct netif *netif; + + /** + * Protect lwIP and pmgr accesses to the list of pcbs. + */ + sys_mutex_t lock; + + /* + * We need to find pcbs both from the guest side and from the host + * side. If we need to support industrial grade ping throughput, + * we will need two pcb hashes. For now, a short linked list + * should be enough. Cf. pxping_pcb_for_request() and + * pxping_pcb_for_reply(). + */ +#define PXPING_MAX_PCBS 8 + size_t npcbs; + struct ping_pcb *pcbs; + +#define TIMEOUT 5 + int timer_active; + size_t timeout_slot; + struct ping_pcb *timeout_list[TIMEOUT]; +}; + + +/** + * Quasi PCB for ping. + */ +struct ping_pcb { + ipX_addr_t src; + ipX_addr_t dst; + + u8_t is_ipv6; + u8_t is_mapped; + + u16_t guest_id; + u16_t host_id; + + /** + * Desired slot in pxping::timeout_list. See pxping_timer(). + */ + size_t timeout_slot; + + /** + * Chaining for pxping::timeout_list + */ + struct ping_pcb **pprev_timeout; + struct ping_pcb *next_timeout; + + /** + * Chaining for pxping::pcbs + */ + struct ping_pcb *next; + + union { + struct sockaddr_in sin; + struct sockaddr_in6 sin6; + } peer; +}; + + +/** + * lwIP thread callback message for IPv4 ping. + * + * We pass raw IP datagram for ip_output_if() so we only need pbuf and + * netif (from pxping). + */ +struct ping_msg { + struct tcpip_msg msg; + struct pxping *pxping; + struct pbuf *p; +}; + + +/** + * lwIP thread callback message for IPv6 ping. + * + * We cannot obtain raw IPv6 datagram from host without extra trouble, + * so we pass ICMPv6 payload in pbuf and also other parameters to + * ip6_output_if(). + */ +struct ping6_msg { + struct tcpip_msg msg; + struct pxping *pxping; + struct pbuf *p; + ip6_addr_t src, dst; + int hopl, tclass; +}; + + +#ifdef RT_OS_WINDOWS +static int pxping_init_windows(struct pxping *pxping); +#endif +static void pxping_recv4(void *arg, struct pbuf *p); +static void pxping_recv6(void *arg, struct pbuf *p); + +static void pxping_timer(void *arg); +static void pxping_timer_needed(struct pxping *pxping); + +static struct ping_pcb *pxping_pcb_for_request(struct pxping *pxping, + int is_ipv6, + ipX_addr_t *src, ipX_addr_t *dst, + u16_t guest_id); +static struct ping_pcb *pxping_pcb_for_reply(struct pxping *pxping, int is_ipv6, + ipX_addr_t *dst, u16_t host_id); + +static FNRTSTRFORMATTYPE pxping_pcb_rtstrfmt; +static struct ping_pcb *pxping_pcb_allocate(struct pxping *pxping); +static void pxping_pcb_register(struct pxping *pxping, struct ping_pcb *pcb); +static void pxping_pcb_deregister(struct pxping *pxping, struct ping_pcb *pcb); +static void pxping_pcb_delete(struct pxping *pxping, struct ping_pcb *pcb); +static void pxping_timeout_add(struct pxping *pxping, struct ping_pcb *pcb); +static void pxping_timeout_del(struct pxping *pxping, struct ping_pcb *pcb); + +static int pxping_pmgr_pump(struct pollmgr_handler *handler, SOCKET fd, int revents); + +static void pxping_pmgr_icmp4(struct pxping *pxping); +static void pxping_pmgr_icmp4_echo(struct pxping *pxping, + u16_t iplen, struct sockaddr_in *peer); +static void pxping_pmgr_icmp4_error(struct pxping *pxping, + u16_t iplen, struct sockaddr_in *peer); +static void pxping_pmgr_icmp6(struct pxping *pxping); +static void pxping_pmgr_icmp6_echo(struct pxping *pxping, + ip6_addr_t *src, ip6_addr_t *dst, + int hopl, int tclass, u16_t icmplen); +static void pxping_pmgr_icmp6_error(struct pxping *pxping, + ip6_addr_t *src, ip6_addr_t *dst, + int hopl, int tclass, u16_t icmplen); + +static void pxping_pmgr_forward_inbound(struct pxping *pxping, u16_t iplen); +static void pxping_pcb_forward_inbound(void *arg); + +static void pxping_pmgr_forward_inbound6(struct pxping *pxping, + ip6_addr_t *src, ip6_addr_t *dst, + u8_t hopl, u8_t tclass, + u16_t icmplen); +static void pxping_pcb_forward_inbound6(void *arg); + +/* + * NB: This is not documented except in RTFS. + * + * If ip_output_if() is passed dest == NULL then it treats p as + * complete IP packet with payload pointing to the IP header. It does + * not build IP header, ignores all header-related arguments, fetches + * real destination from the header in the pbuf and outputs pbuf to + * the specified netif. + */ +#define ip_raw_output_if(p, netif) \ + (ip_output_if((p), NULL, NULL, 0, 0, 0, (netif))) + + + +static struct pxping g_pxping; + + +err_t +pxping_init(struct netif *netif, SOCKET sock4, SOCKET sock6) +{ + const int on = 1; + int status; + + if (sock4 == INVALID_SOCKET && sock6 == INVALID_SOCKET) { + return ERR_VAL; + } + + g_pxping.netif = netif; + sys_mutex_new(&g_pxping.lock); + + g_pxping.sock4 = sock4; + if (g_pxping.sock4 != INVALID_SOCKET) { +#ifdef DF_WITH_IP_HDRINCL + g_pxping.hdrincl = 0; +#else + g_pxping.df = -1; +#endif + g_pxping.ttl = -1; + g_pxping.tos = 0; + +#ifdef RT_OS_LINUX + { + const int dont = IP_PMTUDISC_DONT; + status = setsockopt(sock4, IPPROTO_IP, IP_MTU_DISCOVER, + &dont, sizeof(dont)); + if (status != 0) { + DPRINTF(("IP_MTU_DISCOVER: %R[sockerr]\n", SOCKERRNO())); + } + } +#endif /* RT_OS_LINUX */ + + g_pxping.pmhdl4.callback = pxping_pmgr_pump; + g_pxping.pmhdl4.data = (void *)&g_pxping; + g_pxping.pmhdl4.slot = -1; + pollmgr_add(&g_pxping.pmhdl4, g_pxping.sock4, POLLIN); + + ping_proxy_accept(pxping_recv4, &g_pxping); + } + + g_pxping.sock6 = sock6; +#ifdef RT_OS_WINDOWS + /* we need recvmsg */ + if (g_pxping.sock6 != INVALID_SOCKET) { + status = pxping_init_windows(&g_pxping); + if (status == SOCKET_ERROR) { + g_pxping.sock6 = INVALID_SOCKET; + /* close(sock6); */ + } + } +#endif + if (g_pxping.sock6 != INVALID_SOCKET) { + g_pxping.hopl = -1; + +#if !defined(IPV6_RECVPKTINFO) +#define IPV6_RECVPKTINFO (IPV6_PKTINFO) +#endif + status = setsockopt(sock6, IPPROTO_IPV6, IPV6_RECVPKTINFO, + (const char *)&on, sizeof(on)); + if (status < 0) { + DPRINTF(("IPV6_RECVPKTINFO: %R[sockerr]\n", SOCKERRNO())); + /* XXX: for now this is fatal */ + } + +#if !defined(IPV6_RECVHOPLIMIT) +#define IPV6_RECVHOPLIMIT (IPV6_HOPLIMIT) +#endif + status = setsockopt(sock6, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, + (const char *)&on, sizeof(on)); + if (status < 0) { + DPRINTF(("IPV6_RECVHOPLIMIT: %R[sockerr]\n", SOCKERRNO())); + } + +#ifdef IPV6_RECVTCLASS /* new in RFC 3542, there's no RFC 2292 counterpart */ + /** @todo IPV6_RECVTCLASS */ +#endif + + g_pxping.pmhdl6.callback = pxping_pmgr_pump; + g_pxping.pmhdl6.data = (void *)&g_pxping; + g_pxping.pmhdl6.slot = -1; + pollmgr_add(&g_pxping.pmhdl6, g_pxping.sock6, POLLIN); + + ping6_proxy_accept(pxping_recv6, &g_pxping); + } + + status = RTStrFormatTypeRegister("ping_pcb", pxping_pcb_rtstrfmt, NULL); + AssertRC(status); + + return ERR_OK; +} + + +#ifdef RT_OS_WINDOWS +static int +pxping_init_windows(struct pxping *pxping) +{ + GUID WSARecvMsgGUID = WSAID_WSARECVMSG; + DWORD nread; + int status; + + pxping->pfWSARecvMsg6 = NULL; + status = WSAIoctl(pxping->sock6, + SIO_GET_EXTENSION_FUNCTION_POINTER, + &WSARecvMsgGUID, sizeof(WSARecvMsgGUID), + &pxping->pfWSARecvMsg6, sizeof(pxping->pfWSARecvMsg6), + &nread, + NULL, NULL); + return status; +} +#endif /* RT_OS_WINDOWS */ + + +static u32_t +chksum_delta_16(u16_t oval, u16_t nval) +{ + u32_t sum = (u16_t)~oval; + sum += nval; + return sum; +} + + +static u32_t +chksum_update_16(u16_t *oldp, u16_t nval) +{ + u32_t sum = chksum_delta_16(*oldp, nval); + *oldp = nval; + return sum; +} + + +static u32_t +chksum_delta_32(u32_t oval, u32_t nval) +{ + u32_t sum = ~oval; + sum = FOLD_U32T(sum); + sum += FOLD_U32T(nval); + return sum; +} + + +static u32_t +chksum_update_32(u32_t *oldp, u32_t nval) +{ + u32_t sum = chksum_delta_32(*oldp, nval); + *oldp = nval; + return sum; +} + + +static u32_t +chksum_delta_ipv6(const ip6_addr_t *oldp, const ip6_addr_t *newp) +{ + u32_t sum; + + sum = chksum_delta_32(oldp->addr[0], newp->addr[0]); + sum += chksum_delta_32(oldp->addr[1], newp->addr[1]); + sum += chksum_delta_32(oldp->addr[2], newp->addr[2]); + sum += chksum_delta_32(oldp->addr[3], newp->addr[3]); + + return sum; +} + + +static u32_t +chksum_update_ipv6(ip6_addr_t *oldp, const ip6_addr_t *newp) +{ + u32_t sum; + + sum = chksum_update_32(&oldp->addr[0], newp->addr[0]); + sum += chksum_update_32(&oldp->addr[1], newp->addr[1]); + sum += chksum_update_32(&oldp->addr[2], newp->addr[2]); + sum += chksum_update_32(&oldp->addr[3], newp->addr[3]); + + return sum; +} + + +/** + * ICMP Echo Request in pbuf "p" is to be proxied. + */ +static void +pxping_recv4(void *arg, struct pbuf *p) +{ + struct pxping *pxping = (struct pxping *)arg; + struct ping_pcb *pcb; +#ifdef DF_WITH_IP_HDRINCL + struct ip_hdr iph_orig; +#endif + struct icmp_echo_hdr icmph_orig; + struct ip_hdr *iph; + struct icmp_echo_hdr *icmph; + int df, ttl, tos; + u32_t sum; + u16_t iphlen; + int status; + + iphlen = ip_current_header_tot_len(); + if (iphlen != IP_HLEN) { /* we don't do options */ + pbuf_free(p); + return; + } + + iph = (/* UNCONST */ struct ip_hdr *)ip_current_header(); + icmph = (struct icmp_echo_hdr *)p->payload; + + pcb = pxping_pcb_for_request(pxping, 0, + ipX_current_src_addr(), + ipX_current_dest_addr(), + icmph->id); + if (pcb == NULL) { + pbuf_free(p); + return; + } + + DPRINTF(("ping %p: %R[ping_pcb] seq %d len %u ttl %d\n", + pcb, pcb, + ntohs(icmph->seqno), (unsigned int)p->tot_len, + IPH_TTL(iph))); + + ttl = IPH_TTL(iph); + if (!pcb->is_mapped) { + if (RT_UNLIKELY(ttl == 1)) { + status = pbuf_header(p, iphlen); /* back to IP header */ + if (RT_LIKELY(status == 0)) { + icmp_time_exceeded(p, ICMP_TE_TTL); + } + pbuf_free(p); + return; + } + --ttl; + } + + /* + * OS X doesn't provide a socket option to control fragmentation. + * Solaris doesn't provide IP_DONTFRAG on all releases we support. + * In this case we have to use IP_HDRINCL. We don't want to use + * it always since it doesn't handle fragmentation (but that's ok + * for DF) and Windows doesn't do automatic source address + * selection with IP_HDRINCL. + */ + df = (IPH_OFFSET(iph) & PP_HTONS(IP_DF)) != 0; + +#ifdef DF_WITH_IP_HDRINCL + if (df != pxping->hdrincl) { + status = setsockopt(pxping->sock4, IPPROTO_IP, IP_HDRINCL, + &df, sizeof(df)); + if (RT_LIKELY(status == 0)) { + pxping->hdrincl = df; + } + else { + DPRINTF(("IP_HDRINCL: %R[sockerr]\n", SOCKERRNO())); + } + } + + if (pxping->hdrincl) { + status = pbuf_header(p, iphlen); /* back to IP header */ + if (RT_UNLIKELY(status != 0)) { + pbuf_free(p); + return; + } + + /* we will overwrite IP header, save original for ICMP errors */ + memcpy(&iph_orig, iph, iphlen); + + if (pcb->is_mapped) { + ip4_addr_set_u32(&iph->dest, pcb->peer.sin.sin_addr.s_addr); + } + + if (g_proxy_options->src4 != NULL) { + ip4_addr_set_u32(&iph->src, g_proxy_options->src4->sin_addr.s_addr); + } + else { + /* let the kernel select suitable source address */ + ip_addr_set_any(&iph->src); + } + + IPH_TTL_SET(iph, ttl); /* already decremented */ + IPH_ID_SET(iph, 0); /* kernel will set one */ +#ifdef RT_OS_DARWIN + /* wants ip_offset and ip_len fields in host order */ + IPH_OFFSET_SET(iph, ntohs(IPH_OFFSET(iph))); + IPH_LEN_SET(iph, ntohs(IPH_LEN(iph))); + /* wants checksum of everything (sic!), in host order */ + sum = inet_chksum_pbuf(p); + IPH_CHKSUM_SET(iph, sum); +#else /* !RT_OS_DARWIN */ + IPH_CHKSUM_SET(iph, 0); /* kernel will recalculate */ +#endif + } + else /* !pxping->hdrincl */ +#endif /* DF_WITH_IP_HDRINCL */ + { +#if !defined(DF_WITH_IP_HDRINCL) + /* control DF flag via setsockopt(2) */ +#define USE_DF_OPTION(_Optname) \ + const int dfopt = _Optname; \ + const char * const dfoptname = #_Optname; NOREF(dfoptname) +#if defined(RT_OS_LINUX) + USE_DF_OPTION(IP_MTU_DISCOVER); + df = df ? IP_PMTUDISC_DO : IP_PMTUDISC_DONT; +#elif defined(RT_OS_SOLARIS) || defined(RT_OS_FREEBSD) + USE_DF_OPTION(IP_DONTFRAG); +#elif defined(RT_OS_WINDOWS) + USE_DF_OPTION(IP_DONTFRAGMENT); +#endif + if (df != pxping->df) { + status = setsockopt(pxping->sock4, IPPROTO_IP, dfopt, + (char *)&df, sizeof(df)); + if (RT_LIKELY(status == 0)) { + pxping->df = df; + } + else { + DPRINTF(("%s: %R[sockerr]\n", dfoptname, SOCKERRNO())); + } + } +#endif /* !DF_WITH_IP_HDRINCL */ + + if (ttl != pxping->ttl) { + status = setsockopt(pxping->sock4, IPPROTO_IP, IP_TTL, + (char *)&ttl, sizeof(ttl)); + if (RT_LIKELY(status == 0)) { + pxping->ttl = ttl; + } + else { + DPRINTF(("IP_TTL: %R[sockerr]\n", SOCKERRNO())); + } + } + + tos = IPH_TOS(iph); + if (tos != pxping->tos) { + status = setsockopt(pxping->sock4, IPPROTO_IP, IP_TOS, + (char *)&tos, sizeof(tos)); + if (RT_LIKELY(status == 0)) { + pxping->tos = tos; + } + else { + DPRINTF(("IP_TOS: %R[sockerr]\n", SOCKERRNO())); + } + } + } + + /* rewrite ICMP echo header */ + memcpy(&icmph_orig, icmph, sizeof(*icmph)); + sum = (u16_t)~icmph->chksum; + sum += chksum_update_16(&icmph->id, pcb->host_id); + sum = FOLD_U32T(sum); + icmph->chksum = ~sum; + + status = proxy_sendto(pxping->sock4, p, + &pcb->peer.sin, sizeof(pcb->peer.sin)); + if (status != 0) { + int error = -status; + DPRINTF(("%s: sendto: %R[sockerr]\n", __func__, error)); + +#ifdef DF_WITH_IP_HDRINCL + if (pxping->hdrincl) { + /* restore original IP header */ + memcpy(iph, &iph_orig, iphlen); + } + else +#endif + { + status = pbuf_header(p, iphlen); /* back to IP header */ + if (RT_UNLIKELY(status != 0)) { + pbuf_free(p); + return; + } + } + + /* restore original ICMP header */ + memcpy(icmph, &icmph_orig, sizeof(*icmph)); + + /* + * Some ICMP errors may be generated by the kernel and we read + * them from the socket and forward them normally, hence the + * ifdefs below. + */ + switch (error) { + +#if !( defined(RT_OS_SOLARIS) \ + || (defined(RT_OS_LINUX) && !defined(DF_WITH_IP_HDRINCL)) \ + ) + case EMSGSIZE: + icmp_dest_unreach(p, ICMP_DUR_FRAG); + break; +#endif + + case ENETDOWN: + case ENETUNREACH: + icmp_dest_unreach(p, ICMP_DUR_NET); + break; + + case EHOSTDOWN: + case EHOSTUNREACH: + icmp_dest_unreach(p, ICMP_DUR_HOST); + break; + } + } + + pbuf_free(p); +} + + +/** + * ICMPv6 Echo Request in pbuf "p" is to be proxied. + */ +static void +pxping_recv6(void *arg, struct pbuf *p) +{ + struct pxping *pxping = (struct pxping *)arg; + struct ping_pcb *pcb; + struct ip6_hdr *iph; + struct icmp6_echo_hdr *icmph; + int hopl; + u16_t iphlen; + u16_t id, seq; + int status; + + iph = (/* UNCONST */ struct ip6_hdr *)ip6_current_header(); + iphlen = ip_current_header_tot_len(); + + icmph = (struct icmp6_echo_hdr *)p->payload; + + id = icmph->id; + seq = icmph->seqno; + + pcb = pxping_pcb_for_request(pxping, 1, + ipX_current_src_addr(), + ipX_current_dest_addr(), + id); + if (pcb == NULL) { + pbuf_free(p); + return; + } + + DPRINTF(("ping %p: %R[ping_pcb] seq %d len %u hopl %d\n", + pcb, pcb, + ntohs(seq), (unsigned int)p->tot_len, + IP6H_HOPLIM(iph))); + + hopl = IP6H_HOPLIM(iph); + if (!pcb->is_mapped) { + if (hopl == 1) { + status = pbuf_header(p, iphlen); /* back to IP header */ + if (RT_LIKELY(status == 0)) { + icmp6_time_exceeded(p, ICMP6_TE_HL); + } + pbuf_free(p); + return; + } + --hopl; + } + + /* + * Rewrite ICMPv6 echo header. We don't need to recompute the + * checksum since, unlike IPv4, checksum includes pseudo-header. + * OS computes checksum for us on send() since it needs to select + * source address. + */ + icmph->id = pcb->host_id; + + /** @todo use control messages to save a syscall? */ + if (hopl != pxping->hopl) { + status = setsockopt(pxping->sock6, IPPROTO_IPV6, IPV6_UNICAST_HOPS, + (char *)&hopl, sizeof(hopl)); + if (status == 0) { + pxping->hopl = hopl; + } + else { + DPRINTF(("IPV6_HOPLIMIT: %R[sockerr]\n", SOCKERRNO())); + } + } + + status = proxy_sendto(pxping->sock6, p, + &pcb->peer.sin6, sizeof(pcb->peer.sin6)); + if (status != 0) { + int error = -status; + DPRINTF(("%s: sendto: %R[sockerr]\n", __func__, error)); + + status = pbuf_header(p, iphlen); /* back to IP header */ + if (RT_UNLIKELY(status != 0)) { + pbuf_free(p); + return; + } + + /* restore original ICMP header */ + icmph->id = pcb->guest_id; + + switch (error) { + case EACCES: + icmp6_dest_unreach(p, ICMP6_DUR_PROHIBITED); + break; + +#ifdef ENONET + case ENONET: +#endif + case ENETDOWN: + case ENETUNREACH: + case EHOSTDOWN: + case EHOSTUNREACH: + icmp6_dest_unreach(p, ICMP6_DUR_NO_ROUTE); + break; + } + } + + pbuf_free(p); +} + + +/** + * Formatter for %R[ping_pcb]. + */ +static DECLCALLBACK(size_t) +pxping_pcb_rtstrfmt(PFNRTSTROUTPUT pfnOutput, void *pvArgOutput, + const char *pszType, const void *pvValue, + int cchWidth, int cchPrecision, unsigned int fFlags, + void *pvUser) +{ + const struct ping_pcb *pcb = (const struct ping_pcb *)pvValue; + size_t cb = 0; + + NOREF(cchWidth); + NOREF(cchPrecision); + NOREF(fFlags); + NOREF(pvUser); + + AssertReturn(strcmp(pszType, "ping_pcb") == 0, 0); + + if (pcb == NULL) { + return RTStrFormat(pfnOutput, pvArgOutput, NULL, NULL, "(null)"); + } + + /* XXX: %RTnaipv4 takes the value, but %RTnaipv6 takes the pointer */ + if (pcb->is_ipv6) { + cb += RTStrFormat(pfnOutput, pvArgOutput, NULL, NULL, + "%RTnaipv6 -> %RTnaipv6", &pcb->src, &pcb->dst); + if (pcb->is_mapped) { + cb += RTStrFormat(pfnOutput, pvArgOutput, NULL, NULL, + " (%RTnaipv6)", &pcb->peer.sin6.sin6_addr); + } + } + else { + cb += RTStrFormat(pfnOutput, pvArgOutput, NULL, NULL, + "%RTnaipv4 -> %RTnaipv4", + ip4_addr_get_u32(ipX_2_ip(&pcb->src)), + ip4_addr_get_u32(ipX_2_ip(&pcb->dst))); + if (pcb->is_mapped) { + cb += RTStrFormat(pfnOutput, pvArgOutput, NULL, NULL, + " (%RTnaipv4)", pcb->peer.sin.sin_addr.s_addr); + } + } + + cb += RTStrFormat(pfnOutput, pvArgOutput, NULL, NULL, + " id %04x->%04x", ntohs(pcb->guest_id), ntohs(pcb->host_id)); + + return cb; +} + + +static struct ping_pcb * +pxping_pcb_allocate(struct pxping *pxping) +{ + struct ping_pcb *pcb; + + if (pxping->npcbs >= PXPING_MAX_PCBS) { + return NULL; + } + + pcb = (struct ping_pcb *)malloc(sizeof(*pcb)); + if (pcb == NULL) { + return NULL; + } + + ++pxping->npcbs; + return pcb; +} + + +static void +pxping_pcb_delete(struct pxping *pxping, struct ping_pcb *pcb) +{ + LWIP_ASSERT1(pxping->npcbs > 0); + LWIP_ASSERT1(pcb->next == NULL); + LWIP_ASSERT1(pcb->pprev_timeout == NULL); + + DPRINTF(("%s: ping %p\n", __func__, (void *)pcb)); + + --pxping->npcbs; + free(pcb); +} + + +static void +pxping_timeout_add(struct pxping *pxping, struct ping_pcb *pcb) +{ + struct ping_pcb **chain; + + LWIP_ASSERT1(pcb->pprev_timeout == NULL); + + chain = &pxping->timeout_list[pcb->timeout_slot]; + if ((pcb->next_timeout = *chain) != NULL) { + (*chain)->pprev_timeout = &pcb->next_timeout; + } + *chain = pcb; + pcb->pprev_timeout = chain; +} + + +static void +pxping_timeout_del(struct pxping *pxping, struct ping_pcb *pcb) +{ + LWIP_UNUSED_ARG(pxping); + + LWIP_ASSERT1(pcb->pprev_timeout != NULL); + if (pcb->next_timeout != NULL) { + pcb->next_timeout->pprev_timeout = pcb->pprev_timeout; + } + *pcb->pprev_timeout = pcb->next_timeout; + pcb->pprev_timeout = NULL; + pcb->next_timeout = NULL; +} + + +static void +pxping_pcb_register(struct pxping *pxping, struct ping_pcb *pcb) +{ + pcb->next = pxping->pcbs; + pxping->pcbs = pcb; + + pxping_timeout_add(pxping, pcb); +} + + +static void +pxping_pcb_deregister(struct pxping *pxping, struct ping_pcb *pcb) +{ + struct ping_pcb **p; + + for (p = &pxping->pcbs; *p != NULL; p = &(*p)->next) { + if (*p == pcb) { + *p = pcb->next; + pcb->next = NULL; + break; + } + } + + pxping_timeout_del(pxping, pcb); +} + + +static struct ping_pcb * +pxping_pcb_for_request(struct pxping *pxping, + int is_ipv6, ipX_addr_t *src, ipX_addr_t *dst, + u16_t guest_id) +{ + struct ping_pcb *pcb; + + /* on lwip thread, so no concurrent updates */ + for (pcb = pxping->pcbs; pcb != NULL; pcb = pcb->next) { + if (pcb->guest_id == guest_id + && pcb->is_ipv6 == is_ipv6 + && ipX_addr_cmp(is_ipv6, &pcb->dst, dst) + && ipX_addr_cmp(is_ipv6, &pcb->src, src)) + { + break; + } + } + + if (pcb == NULL) { + int mapped; + + pcb = pxping_pcb_allocate(pxping); + if (pcb == NULL) { + return NULL; + } + + pcb->is_ipv6 = is_ipv6; + ipX_addr_copy(is_ipv6, pcb->src, *src); + ipX_addr_copy(is_ipv6, pcb->dst, *dst); + + pcb->guest_id = guest_id; +#ifdef RT_OS_WINDOWS +# define random() (rand()) +#endif + pcb->host_id = random() & 0xffffUL; + + pcb->pprev_timeout = NULL; + pcb->next_timeout = NULL; + + if (is_ipv6) { + pcb->peer.sin6.sin6_family = AF_INET6; +#if HAVE_SA_LEN + pcb->peer.sin6.sin6_len = sizeof(pcb->peer.sin6); +#endif + pcb->peer.sin6.sin6_port = htons(IPPROTO_ICMPV6); + pcb->peer.sin6.sin6_flowinfo = 0; + mapped = pxremap_outbound_ip6((ip6_addr_t *)&pcb->peer.sin6.sin6_addr, + ipX_2_ip6(&pcb->dst)); + } + else { + pcb->peer.sin.sin_family = AF_INET; +#if HAVE_SA_LEN + pcb->peer.sin.sin_len = sizeof(pcb->peer.sin); +#endif + pcb->peer.sin.sin_port = htons(IPPROTO_ICMP); + mapped = pxremap_outbound_ip4((ip_addr_t *)&pcb->peer.sin.sin_addr, + ipX_2_ip(&pcb->dst)); + } + + if (mapped == PXREMAP_FAILED) { + free(pcb); + return NULL; + } + else { + pcb->is_mapped = (mapped == PXREMAP_MAPPED); + } + + pcb->timeout_slot = pxping->timeout_slot; + + sys_mutex_lock(&pxping->lock); + pxping_pcb_register(pxping, pcb); + sys_mutex_unlock(&pxping->lock); + + DPRINTF(("ping %p: %R[ping_pcb] - created\n", pcb, pcb)); + + pxping_timer_needed(pxping); + } + else { + /* just bump up expiration timeout lazily */ + DPRINTF(("ping %p: %R[ping_pcb] - slot %d -> %d\n", + pcb, pcb, + (unsigned int)pcb->timeout_slot, + (unsigned int)pxping->timeout_slot)); + pcb->timeout_slot = pxping->timeout_slot; + } + + return pcb; +} + + +/* GCC 12.2.1 complains that array subscript is partly outside + * of array bounds in expansion of ipX_addr_cmp. */ +#if RT_GNUC_PREREQ(12, 0) +# pragma GCC diagnostic push +# pragma GCC diagnostic ignored "-Warray-bounds" +#endif +/** + * Called on pollmgr thread. Caller must do the locking since caller + * is going to use the returned pcb, which needs to be protected from + * being expired by pxping_timer() on lwip thread. + */ +static struct ping_pcb * +pxping_pcb_for_reply(struct pxping *pxping, + int is_ipv6, ipX_addr_t *dst, u16_t host_id) +{ + struct ping_pcb *pcb; + + for (pcb = pxping->pcbs; pcb != NULL; pcb = pcb->next) { + if (pcb->host_id == host_id + && pcb->is_ipv6 == is_ipv6 + /* XXX: allow broadcast pings? */ + && ipX_addr_cmp(is_ipv6, &pcb->dst, dst)) + { + return pcb; + } + } + + return NULL; +} +#if RT_GNUC_PREREQ(12, 0) +# pragma GCC diagnostic pop +#endif + + +static void +pxping_timer(void *arg) +{ + struct pxping *pxping = (struct pxping *)arg; + struct ping_pcb **chain, *pcb; + + pxping->timer_active = 0; + + /* + * New slot points to the list of pcbs to check for expiration. + */ + LWIP_ASSERT1(pxping->timeout_slot < TIMEOUT); + if (++pxping->timeout_slot == TIMEOUT) { + pxping->timeout_slot = 0; + } + + chain = &pxping->timeout_list[pxping->timeout_slot]; + pcb = *chain; + + /* protect from pollmgr concurrent reads */ + sys_mutex_lock(&pxping->lock); + + while (pcb != NULL) { + struct ping_pcb *xpcb = pcb; + pcb = pcb->next_timeout; + + if (xpcb->timeout_slot == pxping->timeout_slot) { + /* expired */ + pxping_pcb_deregister(pxping, xpcb); + pxping_pcb_delete(pxping, xpcb); + } + else { + /* + * If there was another request, we updated timeout_slot + * but delayed actually moving the pcb until now. + */ + pxping_timeout_del(pxping, xpcb); /* from current slot */ + pxping_timeout_add(pxping, xpcb); /* to new slot */ + } + } + + sys_mutex_unlock(&pxping->lock); + pxping_timer_needed(pxping); +} + + +static void +pxping_timer_needed(struct pxping *pxping) +{ + if (!pxping->timer_active && pxping->pcbs != NULL) { + pxping->timer_active = 1; + sys_timeout(1 * 1000, pxping_timer, pxping); + } +} + + +static int +pxping_pmgr_pump(struct pollmgr_handler *handler, SOCKET fd, int revents) +{ + struct pxping *pxping; + + pxping = (struct pxping *)handler->data; + LWIP_ASSERT1(fd == pxping->sock4 || fd == pxping->sock6); + + if (revents & ~(POLLIN|POLLERR)) { + DPRINTF0(("%s: unexpected revents 0x%x\n", __func__, revents)); + return POLLIN; + } + + if (revents & POLLERR) { + int sockerr = -1; + socklen_t optlen = (socklen_t)sizeof(sockerr); + int status; + + status = getsockopt(fd, SOL_SOCKET, + SO_ERROR, (char *)&sockerr, &optlen); + if (status < 0) { + DPRINTF(("%s: sock %d: SO_ERROR failed: %R[sockerr]\n", + __func__, fd, SOCKERRNO())); + } + else { + DPRINTF(("%s: sock %d: %R[sockerr]\n", + __func__, fd, sockerr)); + } + } + + if ((revents & POLLIN) == 0) { + return POLLIN; + } + + if (fd == pxping->sock4) { + pxping_pmgr_icmp4(pxping); + } + else /* fd == pxping->sock6 */ { + pxping_pmgr_icmp6(pxping); + } + + return POLLIN; +} + + +/** + * Process incoming ICMP message for the host. + * NB: we will get a lot of spam here and have to sift through it. + */ +static void +pxping_pmgr_icmp4(struct pxping *pxping) +{ + struct sockaddr_in sin; + socklen_t salen = sizeof(sin); + ssize_t nread; + struct ip_hdr *iph; + struct icmp_echo_hdr *icmph; + u16_t iplen, ipoff; + + memset(&sin, 0, sizeof(sin)); + + /* + * Reads from raw IPv4 sockets deliver complete IP datagrams with + * IP header included. + */ + nread = recvfrom(pxping->sock4, pollmgr_udpbuf, sizeof(pollmgr_udpbuf), 0, + (struct sockaddr *)&sin, &salen); + if (nread < 0) { + DPRINTF(("%s: %R[sockerr]\n", __func__, SOCKERRNO())); + return; + } + + if (nread < IP_HLEN) { + DPRINTF2(("%s: read %d bytes, IP header truncated\n", + __func__, (unsigned int)nread)); + return; + } + + iph = (struct ip_hdr *)pollmgr_udpbuf; + + /* match version */ + if (IPH_V(iph) != 4) { + DPRINTF2(("%s: unexpected IP version %d\n", __func__, IPH_V(iph))); + return; + } + + /* no fragmentation */ + ipoff = IPH_OFFSET(iph); +#if defined(RT_OS_DARWIN) + /* darwin reports IPH_OFFSET in host byte order */ + ipoff = htons(ipoff); + IPH_OFFSET_SET(iph, ipoff); +#endif + if ((ipoff & PP_HTONS(IP_OFFMASK | IP_MF)) != 0) { + DPRINTF2(("%s: dropping fragmented datagram (0x%04x)\n", + __func__, ntohs(ipoff))); + return; + } + + /* no options */ + if (IPH_HL(iph) * 4 != IP_HLEN) { + DPRINTF2(("%s: dropping datagram with options (IP header length %d)\n", + __func__, IPH_HL(iph) * 4)); + return; + } + + if (IPH_PROTO(iph) != IP_PROTO_ICMP) { + DPRINTF2(("%s: unexpected protocol %d\n", __func__, IPH_PROTO(iph))); + return; + } + + iplen = IPH_LEN(iph); +#if !defined(RT_OS_DARWIN) + /* darwin reports IPH_LEN in host byte order */ + iplen = ntohs(iplen); +#endif +#if defined(RT_OS_DARWIN) || defined(RT_OS_SOLARIS) + /* darwin and solaris change IPH_LEN to payload length only */ + iplen += IP_HLEN; /* we verified there are no options */ + IPH_LEN_SET(iph, htons(iplen)); +#endif + if (nread < iplen) { + DPRINTF2(("%s: read %d bytes but total length is %d bytes\n", + __func__, (unsigned int)nread, (unsigned int)iplen)); + return; + } + + if (iplen < IP_HLEN + ICMP_HLEN) { + DPRINTF2(("%s: IP length %d bytes, ICMP header truncated\n", + __func__, iplen)); + return; + } + + icmph = (struct icmp_echo_hdr *)(pollmgr_udpbuf + IP_HLEN); + if (ICMPH_TYPE(icmph) == ICMP_ER) { + pxping_pmgr_icmp4_echo(pxping, iplen, &sin); + } + else if (ICMPH_TYPE(icmph) == ICMP_DUR || ICMPH_TYPE(icmph) == ICMP_TE) { + pxping_pmgr_icmp4_error(pxping, iplen, &sin); + } +#if 1 + else { + DPRINTF2(("%s: ignoring ICMP type %d\n", __func__, ICMPH_TYPE(icmph))); + } +#endif +} + + +/** + * Check if this incoming ICMP echo reply is for one of our pings and + * forward it to the guest. + */ +static void +pxping_pmgr_icmp4_echo(struct pxping *pxping, + u16_t iplen, struct sockaddr_in *peer) +{ + struct ip_hdr *iph; + struct icmp_echo_hdr *icmph; + u16_t id, seq; + ip_addr_t guest_ip, target_ip; + int mapped; + struct ping_pcb *pcb; + u16_t guest_id; + u16_t oipsum; + u32_t sum; + RT_NOREF(peer); + + iph = (struct ip_hdr *)pollmgr_udpbuf; + icmph = (struct icmp_echo_hdr *)(pollmgr_udpbuf + IP_HLEN); + + id = icmph->id; + seq = icmph->seqno; + + DPRINTF(("<--- PING %RTnaipv4 id 0x%x seq %d\n", + peer->sin_addr.s_addr, ntohs(id), ntohs(seq))); + + /* + * Is this a reply to one of our pings? + */ + + ip_addr_copy(target_ip, iph->src); + mapped = pxremap_inbound_ip4(&target_ip, &target_ip); + if (mapped == PXREMAP_FAILED) { + return; + } + if (mapped == PXREMAP_ASIS && IPH_TTL(iph) == 1) { + DPRINTF2(("%s: dropping packet with ttl 1\n", __func__)); + return; + } + + sys_mutex_lock(&pxping->lock); + pcb = pxping_pcb_for_reply(pxping, 0, ip_2_ipX(&target_ip), id); + if (pcb == NULL) { + sys_mutex_unlock(&pxping->lock); + DPRINTF2(("%s: no match\n", __func__)); + return; + } + + DPRINTF2(("%s: pcb %p\n", __func__, (void *)pcb)); + + /* save info before unlocking since pcb may expire */ + ip_addr_copy(guest_ip, *ipX_2_ip(&pcb->src)); + guest_id = pcb->guest_id; + + sys_mutex_unlock(&pxping->lock); + + + /* + * Rewrite headers and forward to guest. + */ + + /* rewrite ICMP echo header */ + sum = (u16_t)~icmph->chksum; + sum += chksum_update_16(&icmph->id, guest_id); + sum = FOLD_U32T(sum); + icmph->chksum = ~sum; + + /* rewrite IP header */ + oipsum = IPH_CHKSUM(iph); + if (oipsum == 0) { + /* Solaris doesn't compute checksum for local replies */ + ip_addr_copy(iph->dest, guest_ip); + if (mapped == PXREMAP_MAPPED) { + ip_addr_copy(iph->src, target_ip); + } + else { + IPH_TTL_SET(iph, IPH_TTL(iph) - 1); + } + IPH_CHKSUM_SET(iph, inet_chksum(iph, ntohs(IPH_LEN(iph)))); + } + else { + sum = (u16_t)~oipsum; + sum += chksum_update_32((u32_t *)&iph->dest, + ip4_addr_get_u32(&guest_ip)); + if (mapped == PXREMAP_MAPPED) { + sum += chksum_update_32((u32_t *)&iph->src, + ip4_addr_get_u32(&target_ip)); + } + else { + IPH_TTL_SET(iph, IPH_TTL(iph) - 1); + sum += PP_NTOHS(~0x0100); + } + sum = FOLD_U32T(sum); + IPH_CHKSUM_SET(iph, ~sum); + } + + pxping_pmgr_forward_inbound(pxping, iplen); +} + + +/** + * Check if this incoming ICMP error (destination unreachable or time + * exceeded) is about one of our pings and forward it to the guest. + */ +static void +pxping_pmgr_icmp4_error(struct pxping *pxping, + u16_t iplen, struct sockaddr_in *peer) +{ + struct ip_hdr *iph, *oiph; + struct icmp_echo_hdr *icmph, *oicmph; + u16_t oipoff, oiphlen, oiplen; + u16_t id, seq; + ip_addr_t guest_ip, target_ip, error_ip; + int target_mapped, error_mapped; + struct ping_pcb *pcb; + u16_t guest_id; + u32_t sum; + RT_NOREF(peer); + + iph = (struct ip_hdr *)pollmgr_udpbuf; + icmph = (struct icmp_echo_hdr *)(pollmgr_udpbuf + IP_HLEN); + + /* + * Inner IP datagram is not checked by the kernel and may be + * anything, possibly malicious. + */ + + oipoff = IP_HLEN + ICMP_HLEN; + oiplen = iplen - oipoff; /* NB: truncated length, not IPH_LEN(oiph) */ + if (oiplen < IP_HLEN) { + DPRINTF2(("%s: original datagram truncated to %d bytes\n", + __func__, oiplen)); + } + + /* IP header of the original message */ + oiph = (struct ip_hdr *)(pollmgr_udpbuf + oipoff); + + /* match version */ + if (IPH_V(oiph) != 4) { + DPRINTF2(("%s: unexpected IP version %d\n", __func__, IPH_V(oiph))); + return; + } + + /* can't match fragments except the first one */ + if ((IPH_OFFSET(oiph) & PP_HTONS(IP_OFFMASK)) != 0) { + DPRINTF2(("%s: ignoring fragment with offset %d\n", + __func__, ntohs(IPH_OFFSET(oiph) & PP_HTONS(IP_OFFMASK)))); + return; + } + + if (IPH_PROTO(oiph) != IP_PROTO_ICMP) { +#if 0 + /* don't spam with every "destination unreachable" in the system */ + DPRINTF2(("%s: ignoring protocol %d\n", __func__, IPH_PROTO(oiph))); +#endif + return; + } + + oiphlen = IPH_HL(oiph) * 4; + if (oiplen < oiphlen + ICMP_HLEN) { + DPRINTF2(("%s: original datagram truncated to %d bytes\n", + __func__, oiplen)); + return; + } + + oicmph = (struct icmp_echo_hdr *)(pollmgr_udpbuf + oipoff + oiphlen); + if (ICMPH_TYPE(oicmph) != ICMP_ECHO) { + DPRINTF2(("%s: ignoring ICMP error for original ICMP type %d\n", + __func__, ICMPH_TYPE(oicmph))); + return; + } + + id = oicmph->id; + seq = oicmph->seqno; + + DPRINTF2(("%s: ping %RTnaipv4 id 0x%x seq %d", + __func__, ip4_addr_get_u32(&oiph->dest), ntohs(id), ntohs(seq))); + if (ICMPH_TYPE(icmph) == ICMP_DUR) { + DPRINTF2((" unreachable (code %d)\n", ICMPH_CODE(icmph))); + } + else { + DPRINTF2((" time exceeded\n")); + } + + + /* + * Is the inner (failed) datagram one of our pings? + */ + + ip_addr_copy(target_ip, oiph->dest); /* inner (failed) */ + target_mapped = pxremap_inbound_ip4(&target_ip, &target_ip); + if (target_mapped == PXREMAP_FAILED) { + return; + } + + sys_mutex_lock(&pxping->lock); + pcb = pxping_pcb_for_reply(pxping, 0, ip_2_ipX(&target_ip), id); + if (pcb == NULL) { + sys_mutex_unlock(&pxping->lock); + DPRINTF2(("%s: no match\n", __func__)); + return; + } + + DPRINTF2(("%s: pcb %p\n", __func__, (void *)pcb)); + + /* save info before unlocking since pcb may expire */ + ip_addr_copy(guest_ip, *ipX_2_ip(&pcb->src)); + guest_id = pcb->guest_id; + + sys_mutex_unlock(&pxping->lock); + + + /* + * Rewrite both inner and outer headers and forward to guest. + * Note that the checksum of the outer ICMP error message is + * preserved by the changes we do to inner headers. + */ + + ip_addr_copy(error_ip, iph->src); /* node that reports the error */ + error_mapped = pxremap_inbound_ip4(&error_ip, &error_ip); + if (error_mapped == PXREMAP_FAILED) { + return; + } + if (error_mapped == PXREMAP_ASIS && IPH_TTL(iph) == 1) { + DPRINTF2(("%s: dropping packet with ttl 1\n", __func__)); + return; + } + + /* rewrite inner ICMP echo header */ + sum = (u16_t)~oicmph->chksum; + sum += chksum_update_16(&oicmph->id, guest_id); + sum = FOLD_U32T(sum); + oicmph->chksum = ~sum; + + /* rewrite inner IP header */ +#if defined(RT_OS_DARWIN) + /* darwin converts inner length to host byte order too */ + IPH_LEN_SET(oiph, htons(IPH_LEN(oiph))); +#endif + sum = (u16_t)~IPH_CHKSUM(oiph); + sum += chksum_update_32((u32_t *)&oiph->src, ip4_addr_get_u32(&guest_ip)); + if (target_mapped == PXREMAP_MAPPED) { + sum += chksum_update_32((u32_t *)&oiph->dest, ip4_addr_get_u32(&target_ip)); + } + sum = FOLD_U32T(sum); + IPH_CHKSUM_SET(oiph, ~sum); + + /* rewrite outer IP header */ + sum = (u16_t)~IPH_CHKSUM(iph); + sum += chksum_update_32((u32_t *)&iph->dest, ip4_addr_get_u32(&guest_ip)); + if (error_mapped == PXREMAP_MAPPED) { + sum += chksum_update_32((u32_t *)&iph->src, ip4_addr_get_u32(&error_ip)); + } + else { + IPH_TTL_SET(iph, IPH_TTL(iph) - 1); + sum += PP_NTOHS(~0x0100); + } + sum = FOLD_U32T(sum); + IPH_CHKSUM_SET(iph, ~sum); + + pxping_pmgr_forward_inbound(pxping, iplen); +} + + +/** + * Process incoming ICMPv6 message for the host. + * NB: we will get a lot of spam here and have to sift through it. + */ +static void +pxping_pmgr_icmp6(struct pxping *pxping) +{ +#ifndef RT_OS_WINDOWS + struct msghdr mh; + ssize_t nread; +#else + WSAMSG mh; + DWORD nread; +#endif + IOVEC iov[1]; + static u8_t cmsgbuf[128]; + struct cmsghdr *cmh; + struct sockaddr_in6 sin6; + /* socklen_t salen = sizeof(sin6); - unused */ + struct icmp6_echo_hdr *icmph; + struct in6_pktinfo *pktinfo; + int hopl, tclass; +#ifdef RT_OS_WINDOWS + int status; +#endif + + /* + * Reads from raw IPv6 sockets deliver only the payload. Full + * headers are available via recvmsg(2)/cmsg(3). + */ + IOVEC_SET_BASE(iov[0], pollmgr_udpbuf); + IOVEC_SET_LEN(iov[0], sizeof(pollmgr_udpbuf)); + + memset(&mh, 0, sizeof(mh)); +#ifndef RT_OS_WINDOWS + mh.msg_name = &sin6; + mh.msg_namelen = sizeof(sin6); + mh.msg_iov = iov; + mh.msg_iovlen = 1; + mh.msg_control = cmsgbuf; + mh.msg_controllen = sizeof(cmsgbuf); + mh.msg_flags = 0; + + nread = recvmsg(pxping->sock6, &mh, 0); + if (nread < 0) { + DPRINTF(("%s: %R[sockerr]\n", __func__, SOCKERRNO())); + return; + } +#else /* RT_OS_WINDOWS */ + mh.name = (LPSOCKADDR)&sin6; + mh.namelen = sizeof(sin6); + mh.lpBuffers = iov; + mh.dwBufferCount = 1; + mh.Control.buf = cmsgbuf; + mh.Control.len = sizeof(cmsgbuf); + mh.dwFlags = 0; + + status = (*pxping->pfWSARecvMsg6)(pxping->sock6, &mh, &nread, NULL, NULL); + if (status == SOCKET_ERROR) { + DPRINTF2(("%s: error %d\n", __func__, WSAGetLastError())); + return; + } +#endif + + icmph = (struct icmp6_echo_hdr *)pollmgr_udpbuf; + + DPRINTF2(("%s: %RTnaipv6 ICMPv6: ", __func__, &sin6.sin6_addr)); + + if (icmph->type == ICMP6_TYPE_EREP) { + DPRINTF2(("echo reply %04x %u\n", + (unsigned int)icmph->id, (unsigned int)icmph->seqno)); + } + else { /* XXX */ + if (icmph->type == ICMP6_TYPE_EREQ) { + DPRINTF2(("echo request %04x %u\n", + (unsigned int)icmph->id, (unsigned int)icmph->seqno)); + } + else if (icmph->type == ICMP6_TYPE_DUR) { + DPRINTF2(("destination unreachable\n")); + } + else if (icmph->type == ICMP6_TYPE_PTB) { + DPRINTF2(("packet too big\n")); + } + else if (icmph->type == ICMP6_TYPE_TE) { + DPRINTF2(("time exceeded\n")); + } + else if (icmph->type == ICMP6_TYPE_PP) { + DPRINTF2(("parameter problem\n")); + } + else { + DPRINTF2(("type %d len %u\n", icmph->type, (unsigned int)nread)); + } + + if (icmph->type >= ICMP6_TYPE_EREQ) { + return; /* informational message */ + } + } + + pktinfo = NULL; + hopl = -1; + tclass = -1; + for (cmh = CMSG_FIRSTHDR(&mh); cmh != NULL; cmh = CMSG_NXTHDR(&mh, cmh)) { + if (cmh->cmsg_len == 0) + break; + + if (cmh->cmsg_level == IPPROTO_IPV6 + && cmh->cmsg_type == IPV6_HOPLIMIT + && cmh->cmsg_len == CMSG_LEN(sizeof(int))) + { + hopl = *(int *)CMSG_DATA(cmh); + DPRINTF2(("hoplimit = %d\n", hopl)); + } + + if (cmh->cmsg_level == IPPROTO_IPV6 + && cmh->cmsg_type == IPV6_PKTINFO + && cmh->cmsg_len == CMSG_LEN(sizeof(struct in6_pktinfo))) + { + pktinfo = (struct in6_pktinfo *)CMSG_DATA(cmh); + DPRINTF2(("pktinfo found\n")); + } + } + + if (pktinfo == NULL) { + /* + * ip6_output_if() doesn't do checksum for us so we need to + * manually recompute it - for this we must know the + * destination address of the pseudo-header that we will + * rewrite with guest's address. (TODO: yeah, yeah, we can + * compute it from scratch...) + */ + DPRINTF2(("%s: unable to get pktinfo\n", __func__)); + return; + } + + if (hopl < 0) { + hopl = LWIP_ICMP6_HL; + } + + if (icmph->type == ICMP6_TYPE_EREP) { + pxping_pmgr_icmp6_echo(pxping, + (ip6_addr_t *)&sin6.sin6_addr, + (ip6_addr_t *)&pktinfo->ipi6_addr, + hopl, tclass, (u16_t)nread); + } + else if (icmph->type < ICMP6_TYPE_EREQ) { + pxping_pmgr_icmp6_error(pxping, + (ip6_addr_t *)&sin6.sin6_addr, + (ip6_addr_t *)&pktinfo->ipi6_addr, + hopl, tclass, (u16_t)nread); + } +} + + +/** + * Check if this incoming ICMPv6 echo reply is for one of our pings + * and forward it to the guest. + */ +static void +pxping_pmgr_icmp6_echo(struct pxping *pxping, + ip6_addr_t *src, ip6_addr_t *dst, + int hopl, int tclass, u16_t icmplen) +{ + struct icmp6_echo_hdr *icmph; + ip6_addr_t guest_ip, target_ip; + int mapped; + struct ping_pcb *pcb; + u16_t id, guest_id; + u32_t sum; + + ip6_addr_copy(target_ip, *src); + mapped = pxremap_inbound_ip6(&target_ip, &target_ip); + if (mapped == PXREMAP_FAILED) { + return; + } + else if (mapped == PXREMAP_ASIS) { + if (hopl == 1) { + DPRINTF2(("%s: dropping packet with ttl 1\n", __func__)); + return; + } + --hopl; + } + + icmph = (struct icmp6_echo_hdr *)pollmgr_udpbuf; + id = icmph->id; + + sys_mutex_lock(&pxping->lock); + pcb = pxping_pcb_for_reply(pxping, 1, ip6_2_ipX(&target_ip), id); + if (pcb == NULL) { + sys_mutex_unlock(&pxping->lock); + DPRINTF2(("%s: no match\n", __func__)); + return; + } + + DPRINTF2(("%s: pcb %p\n", __func__, (void *)pcb)); + + /* save info before unlocking since pcb may expire */ + ip6_addr_copy(guest_ip, *ipX_2_ip6(&pcb->src)); + guest_id = pcb->guest_id; + + sys_mutex_unlock(&pxping->lock); + + /* rewrite ICMPv6 echo header */ + sum = (u16_t)~icmph->chksum; + sum += chksum_update_16(&icmph->id, guest_id); + sum += chksum_delta_ipv6(dst, &guest_ip); /* pseudo */ + if (mapped) { + sum += chksum_delta_ipv6(src, &target_ip); /* pseudo */ + } + sum = FOLD_U32T(sum); + icmph->chksum = ~sum; + + pxping_pmgr_forward_inbound6(pxping, + &target_ip, /* echo reply src */ + &guest_ip, /* echo reply dst */ + hopl, tclass, icmplen); +} + + +/** + * Check if this incoming ICMPv6 error is about one of our pings and + * forward it to the guest. + */ +static void +pxping_pmgr_icmp6_error(struct pxping *pxping, + ip6_addr_t *src, ip6_addr_t *dst, + int hopl, int tclass, u16_t icmplen) +{ + struct icmp6_hdr *icmph; + u8_t *bufptr; + size_t buflen, hlen; + int proto; + struct ip6_hdr *oiph; + struct icmp6_echo_hdr *oicmph; + struct ping_pcb *pcb; + ip6_addr_t guest_ip, target_ip, error_ip; + int target_mapped, error_mapped; + u16_t guest_id; + u32_t sum; + + icmph = (struct icmp6_hdr *)pollmgr_udpbuf; + + /* + * Inner IP datagram is not checked by the kernel and may be + * anything, possibly malicious. + */ + oiph = NULL; + oicmph = NULL; + + bufptr = pollmgr_udpbuf; + buflen = icmplen; + + hlen = sizeof(*icmph); + proto = IP6_NEXTH_ENCAPS; /* i.e. IPv6, lwIP's name is unfortuate */ + for (;;) { + if (hlen > buflen) { + DPRINTF2(("truncated datagram inside ICMPv6 error message is too short\n")); + return; + } + buflen -= hlen; + bufptr += hlen; + + if (proto == IP6_NEXTH_ENCAPS && oiph == NULL) { /* outermost IPv6 */ + oiph = (struct ip6_hdr *)bufptr; + if (IP6H_V(oiph) != 6) { + DPRINTF2(("%s: unexpected IP version %d\n", __func__, IP6H_V(oiph))); + return; + } + + proto = IP6H_NEXTH(oiph); + hlen = IP6_HLEN; + } + else if (proto == IP6_NEXTH_ICMP6) { + oicmph = (struct icmp6_echo_hdr *)bufptr; + break; + } + else if (proto == IP6_NEXTH_ROUTING + || proto == IP6_NEXTH_HOPBYHOP + || proto == IP6_NEXTH_DESTOPTS) + { + proto = bufptr[0]; + hlen = (bufptr[1] + 1) * 8; + } + else { + DPRINTF2(("%s: stopping at protocol %d\n", __func__, proto)); + break; + } + } + + if (oiph == NULL || oicmph == NULL) { + return; + } + + if (buflen < sizeof(*oicmph)) { + DPRINTF2(("%s: original ICMPv6 is truncated too short\n", __func__)); + return; + } + + if (oicmph->type != ICMP6_TYPE_EREQ) { + DPRINTF2(("%s: ignoring original ICMPv6 type %d\n", __func__, oicmph->type)); + return; + } + + ip6_addr_copy(target_ip, oiph->dest); /* inner (failed) */ + target_mapped = pxremap_inbound_ip6(&target_ip, &target_ip); + if (target_mapped == PXREMAP_FAILED) { + return; + } + + sys_mutex_lock(&pxping->lock); + pcb = pxping_pcb_for_reply(pxping, 1, ip6_2_ipX(&target_ip), oicmph->id); + if (pcb == NULL) { + sys_mutex_unlock(&pxping->lock); + DPRINTF2(("%s: no match\n", __func__)); + return; + } + + DPRINTF2(("%s: pcb %p\n", __func__, (void *)pcb)); + + /* save info before unlocking since pcb may expire */ + ip6_addr_copy(guest_ip, *ipX_2_ip6(&pcb->src)); + guest_id = pcb->guest_id; + + sys_mutex_unlock(&pxping->lock); + + + /* + * Rewrite inner and outer headers and forward to guest. Note + * that IPv6 has no IP header checksum, but uses pseudo-header for + * ICMPv6, so we update both in one go, adjusting ICMPv6 checksum + * as we rewrite IP header. + */ + + ip6_addr_copy(error_ip, *src); /* node that reports the error */ + error_mapped = pxremap_inbound_ip6(&error_ip, &error_ip); + if (error_mapped == PXREMAP_FAILED) { + return; + } + if (error_mapped == PXREMAP_ASIS && hopl == 1) { + DPRINTF2(("%s: dropping packet with ttl 1\n", __func__)); + return; + } + + /* rewrite inner ICMPv6 echo header and inner IPv6 header */ + sum = (u16_t)~oicmph->chksum; + sum += chksum_update_16(&oicmph->id, guest_id); + sum += chksum_update_ipv6((ip6_addr_t *)&oiph->src, &guest_ip); + if (target_mapped) { + sum += chksum_delta_ipv6((ip6_addr_t *)&oiph->dest, &target_ip); + } + sum = FOLD_U32T(sum); + oicmph->chksum = ~sum; + + /* rewrite outer ICMPv6 error header */ + sum = (u16_t)~icmph->chksum; + sum += chksum_delta_ipv6(dst, &guest_ip); /* pseudo */ + if (error_mapped) { + sum += chksum_delta_ipv6(src, &error_ip); /* pseudo */ + } + sum = FOLD_U32T(sum); + icmph->chksum = ~sum; + + pxping_pmgr_forward_inbound6(pxping, + &error_ip, /* error src */ + &guest_ip, /* error dst */ + hopl, tclass, icmplen); +} + + +/** + * Hand off ICMP datagram to the lwip thread where it will be + * forwarded to the guest. + * + * We no longer need ping_pcb. The pcb may get expired on the lwip + * thread, but we have already patched necessary information into the + * datagram. + */ +static void +pxping_pmgr_forward_inbound(struct pxping *pxping, u16_t iplen) +{ + struct pbuf *p; + struct ping_msg *msg; + err_t error; + + p = pbuf_alloc(PBUF_LINK, iplen, PBUF_RAM); + if (p == NULL) { + DPRINTF(("%s: pbuf_alloc(%d) failed\n", + __func__, (unsigned int)iplen)); + return; + } + + error = pbuf_take(p, pollmgr_udpbuf, iplen); + if (error != ERR_OK) { + DPRINTF(("%s: pbuf_take(%d) failed\n", + __func__, (unsigned int)iplen)); + pbuf_free(p); + return; + } + + msg = (struct ping_msg *)malloc(sizeof(*msg)); + if (msg == NULL) { + pbuf_free(p); + return; + } + + msg->msg.type = TCPIP_MSG_CALLBACK_STATIC; + msg->msg.sem = NULL; + msg->msg.msg.cb.function = pxping_pcb_forward_inbound; + msg->msg.msg.cb.ctx = (void *)msg; + + msg->pxping = pxping; + msg->p = p; + + proxy_lwip_post(&msg->msg); +} + + +static void +pxping_pcb_forward_inbound(void *arg) +{ + struct ping_msg *msg = (struct ping_msg *)arg; + err_t error; + + LWIP_ASSERT1(msg != NULL); + LWIP_ASSERT1(msg->pxping != NULL); + LWIP_ASSERT1(msg->p != NULL); + + error = ip_raw_output_if(msg->p, msg->pxping->netif); + if (error != ERR_OK) { + DPRINTF(("%s: ip_output_if: %s\n", + __func__, proxy_lwip_strerr(error))); + } + pbuf_free(msg->p); + free(msg); +} + + +static void +pxping_pmgr_forward_inbound6(struct pxping *pxping, + ip6_addr_t *src, ip6_addr_t *dst, + u8_t hopl, u8_t tclass, + u16_t icmplen) +{ + struct pbuf *p; + struct ping6_msg *msg; + + err_t error; + + p = pbuf_alloc(PBUF_IP, icmplen, PBUF_RAM); + if (p == NULL) { + DPRINTF(("%s: pbuf_alloc(%d) failed\n", + __func__, (unsigned int)icmplen)); + return; + } + + error = pbuf_take(p, pollmgr_udpbuf, icmplen); + if (error != ERR_OK) { + DPRINTF(("%s: pbuf_take(%d) failed\n", + __func__, (unsigned int)icmplen)); + pbuf_free(p); + return; + } + + msg = (struct ping6_msg *)malloc(sizeof(*msg)); + if (msg == NULL) { + pbuf_free(p); + return; + } + + msg->msg.type = TCPIP_MSG_CALLBACK_STATIC; + msg->msg.sem = NULL; + msg->msg.msg.cb.function = pxping_pcb_forward_inbound6; + msg->msg.msg.cb.ctx = (void *)msg; + + msg->pxping = pxping; + msg->p = p; + ip6_addr_copy(msg->src, *src); + ip6_addr_copy(msg->dst, *dst); + msg->hopl = hopl; + msg->tclass = tclass; + + proxy_lwip_post(&msg->msg); +} + + +static void +pxping_pcb_forward_inbound6(void *arg) +{ + struct ping6_msg *msg = (struct ping6_msg *)arg; + err_t error; + + LWIP_ASSERT1(msg != NULL); + LWIP_ASSERT1(msg->pxping != NULL); + LWIP_ASSERT1(msg->p != NULL); + + error = ip6_output_if(msg->p, + &msg->src, &msg->dst, msg->hopl, msg->tclass, + IP6_NEXTH_ICMP6, msg->pxping->netif); + if (error != ERR_OK) { + DPRINTF(("%s: ip6_output_if: %s\n", + __func__, proxy_lwip_strerr(error))); + } + pbuf_free(msg->p); + free(msg); +} diff --git a/src/VBox/NetworkServices/NAT/pxping_win.c b/src/VBox/NetworkServices/NAT/pxping_win.c new file mode 100644 index 00000000..2c6da8fd --- /dev/null +++ b/src/VBox/NetworkServices/NAT/pxping_win.c @@ -0,0 +1,672 @@ +/* $Id: pxping_win.c $ */ +/** @file + * NAT Network - ping proxy, Windows ICMP API version. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#define LOG_GROUP LOG_GROUP_NAT_SERVICE + +#include "winutils.h" +#include "proxy.h" +#include "pxremap.h" + +#include "lwip/ip.h" +#include "lwip/icmp.h" +#include "lwip/inet_chksum.h" + +/* XXX: lwIP names conflict with winsock <iphlpapi.h> */ +#undef IP_STATS +#undef ICMP_STATS +#undef TCP_STATS +#undef UDP_STATS +#undef IP6_STATS + +#include <winternl.h> /* for PIO_APC_ROUTINE &c */ +#ifndef PIO_APC_ROUTINE_DEFINED +# define PIO_APC_ROUTINE_DEFINED 1 +#endif +#include <iprt/win/iphlpapi.h> +#include <icmpapi.h> + +#include <stdio.h> + + +struct pxping { + /* + * We use single ICMP handle for all pings. This means that all + * proxied pings will have the same id and share single sequence + * of sequence numbers. + */ + HANDLE hdl4; + HANDLE hdl6; + + struct netif *netif; + + /* + * On Windows XP and Windows Server 2003 IcmpSendEcho2() callback + * is FARPROC, but starting from Vista it's PIO_APC_ROUTINE with + * two extra arguments. Callbacks use WINAPI (stdcall) calling + * convention with callee responsible for popping the arguments, + * so to avoid stack corruption we check windows version at run + * time and provide correct callback. + */ + PIO_APC_ROUTINE pfnCallback4; + PIO_APC_ROUTINE pfnCallback6; +}; + + +struct pong4 { + struct netif *netif; + + struct ip_hdr reqiph; + struct icmp_echo_hdr reqicmph; + + size_t bufsize; + u8_t buf[1]; +}; + + +struct pong6 { + struct netif *netif; + + ip6_addr_t reqsrc; + struct icmp6_echo_hdr reqicmph; + size_t reqsize; + + size_t bufsize; + u8_t buf[1]; +}; + + +static void pxping_recv4(void *arg, struct pbuf *p); +static void pxping_recv6(void *arg, struct pbuf *p); + +static VOID WINAPI pxping_icmp4_callback_old(void *); +static VOID WINAPI pxping_icmp4_callback_apc(void *, PIO_STATUS_BLOCK, ULONG); +static void pxping_icmp4_callback(struct pong4 *pong); + +static VOID WINAPI pxping_icmp6_callback_old(void *); +static VOID WINAPI pxping_icmp6_callback_apc(void *, PIO_STATUS_BLOCK, ULONG); +static void pxping_icmp6_callback(struct pong6 *pong); + + +struct pxping g_pxping; + + +err_t +pxping_init(struct netif *netif, SOCKET sock4, SOCKET sock6) +{ + OSVERSIONINFO osvi; + int status; + + LWIP_UNUSED_ARG(sock4); + LWIP_UNUSED_ARG(sock6); + + ZeroMemory(&osvi, sizeof(OSVERSIONINFO)); + osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); + status = GetVersionEx(&osvi); + if (status == 0) { + return ERR_ARG; + } + + if (osvi.dwMajorVersion >= 6) { + g_pxping.pfnCallback4 = pxping_icmp4_callback_apc; + g_pxping.pfnCallback6 = pxping_icmp6_callback_apc; + } + else { + g_pxping.pfnCallback4 = (PIO_APC_ROUTINE)pxping_icmp4_callback_old; + g_pxping.pfnCallback6 = (PIO_APC_ROUTINE)pxping_icmp6_callback_old; + } + + + g_pxping.hdl4 = IcmpCreateFile(); + if (g_pxping.hdl4 != INVALID_HANDLE_VALUE) { + ping_proxy_accept(pxping_recv4, &g_pxping); + } + else { + DPRINTF(("IcmpCreateFile: error %d\n", GetLastError())); + } + + g_pxping.hdl6 = Icmp6CreateFile(); + if (g_pxping.hdl6 != INVALID_HANDLE_VALUE) { + ping6_proxy_accept(pxping_recv6, &g_pxping); + } + else { + DPRINTF(("Icmp6CreateFile: error %d\n", GetLastError())); + } + + if (g_pxping.hdl4 == INVALID_HANDLE_VALUE + && g_pxping.hdl6 == INVALID_HANDLE_VALUE) + { + return ERR_ARG; + } + + g_pxping.netif = netif; + + return ERR_OK; +} + + +/** + * ICMP Echo Request in pbuf "p" is to be proxied. + */ +static void +pxping_recv4(void *arg, struct pbuf *p) +{ + struct pxping *pxping = (struct pxping *)arg; + const struct ip_hdr *iph; + const struct icmp_echo_hdr *icmph; + u16_t iphlen; + size_t bufsize; + struct pong4 *pong; + IPAddr dst; + int mapped; + int ttl; + IP_OPTION_INFORMATION opts; + void *reqdata; + size_t reqsize; + int status; + + pong = NULL; + + iphlen = ip_current_header_tot_len(); + if (RT_UNLIKELY(iphlen != IP_HLEN)) { /* we don't do options */ + goto out; + } + + iph = (const struct ip_hdr *)ip_current_header(); + icmph = (const struct icmp_echo_hdr *)p->payload; + + mapped = pxremap_outbound_ip4((ip_addr_t *)&dst, (ip_addr_t *)&iph->dest); + if (RT_UNLIKELY(mapped == PXREMAP_FAILED)) { + goto out; + } + + ttl = IPH_TTL(iph); + if (mapped == PXREMAP_ASIS) { + if (RT_UNLIKELY(ttl == 1)) { + status = pbuf_header(p, iphlen); /* back to IP header */ + if (RT_LIKELY(status == 0)) { + icmp_time_exceeded(p, ICMP_TE_TTL); + } + goto out; + } + --ttl; + } + + status = pbuf_header(p, -(u16_t)sizeof(*icmph)); /* to ping payload */ + if (RT_UNLIKELY(status != 0)) { + goto out; + } + + bufsize = sizeof(ICMP_ECHO_REPLY); + if (p->tot_len < sizeof(IO_STATUS_BLOCK) + sizeof(struct icmp_echo_hdr)) + bufsize += sizeof(IO_STATUS_BLOCK) + sizeof(struct icmp_echo_hdr); + else + bufsize += p->tot_len; + bufsize += 16; /* whatever that is; empirically at least XP needs it */ + + pong = (struct pong4 *)malloc(RT_UOFFSETOF(struct pong4, buf) + bufsize); + if (RT_UNLIKELY(pong == NULL)) { + goto out; + } + pong->bufsize = bufsize; + pong->netif = pxping->netif; + + memcpy(&pong->reqiph, iph, sizeof(*iph)); + memcpy(&pong->reqicmph, icmph, sizeof(*icmph)); + + reqsize = p->tot_len; + if (p->next == NULL) { + /* single pbuf can be directly used as request data source */ + reqdata = p->payload; + } + else { + /* data from pbuf chain must be concatenated */ + pbuf_copy_partial(p, pong->buf, p->tot_len, 0); + reqdata = pong->buf; + } + + opts.Ttl = ttl; + opts.Tos = IPH_TOS(iph); /* affected by DisableUserTOSSetting key */ + opts.Flags = (IPH_OFFSET(iph) & PP_HTONS(IP_DF)) != 0 ? IP_FLAG_DF : 0; + opts.OptionsSize = 0; + opts.OptionsData = 0; + + status = IcmpSendEcho2(pxping->hdl4, NULL, + pxping->pfnCallback4, pong, + dst, reqdata, (WORD)reqsize, &opts, + pong->buf, (DWORD)pong->bufsize, + 5 * 1000 /* ms */); + + if (RT_UNLIKELY(status != 0)) { + DPRINTF(("IcmpSendEcho2: unexpected status %d\n", status)); + goto out; + } + if ((status = GetLastError()) != ERROR_IO_PENDING) { + int code; + + DPRINTF(("IcmpSendEcho2: error %d\n", status)); + switch (status) { + case ERROR_NETWORK_UNREACHABLE: + code = ICMP_DUR_NET; + break; + case ERROR_HOST_UNREACHABLE: + code = ICMP_DUR_HOST; + break; + default: + code = -1; + break; + } + + if (code != -1) { + /* move payload back to IP header */ + status = pbuf_header(p, (u16_t)(sizeof(*icmph) + iphlen)); + if (RT_LIKELY(status == 0)) { + icmp_dest_unreach(p, code); + } + } + goto out; + } + + pong = NULL; /* callback owns it now */ + out: + if (pong != NULL) { + free(pong); + } + pbuf_free(p); +} + + +static VOID WINAPI +pxping_icmp4_callback_apc(void *ctx, PIO_STATUS_BLOCK iob, ULONG reserved) +{ + struct pong4 *pong = (struct pong4 *)ctx; + LWIP_UNUSED_ARG(iob); + LWIP_UNUSED_ARG(reserved); + + if (pong != NULL) { + pxping_icmp4_callback(pong); + free(pong); + } +} + + +static VOID WINAPI +pxping_icmp4_callback_old(void *ctx) +{ + struct pong4 *pong = (struct pong4 *)ctx; + + if (pong != NULL) { + pxping_icmp4_callback(pong); + free(pong); + } +} + + +static void +pxping_icmp4_callback(struct pong4 *pong) +{ + ICMP_ECHO_REPLY *reply; + DWORD nreplies; + size_t icmplen; + struct pbuf *p; + struct icmp_echo_hdr *icmph; + ip_addr_t src; + int mapped; + + nreplies = IcmpParseReplies(pong->buf, (DWORD)pong->bufsize); + if (nreplies == 0) { + DWORD error = GetLastError(); + if (error == IP_REQ_TIMED_OUT) { + DPRINTF2(("pong4: %p timed out\n", (void *)pong)); + } + else { + DPRINTF(("pong4: %p: IcmpParseReplies: error %d\n", + (void *)pong, error)); + } + return; + } + + reply = (ICMP_ECHO_REPLY *)pong->buf; + + if (reply->Options.OptionsSize != 0) { /* don't do options */ + return; + } + + mapped = pxremap_inbound_ip4(&src, (ip_addr_t *)&reply->Address); + if (mapped == PXREMAP_FAILED) { + return; + } + if (mapped == PXREMAP_ASIS) { + if (reply->Options.Ttl == 1) { + return; + } + --reply->Options.Ttl; + } + + if (reply->Status == IP_SUCCESS) { + icmplen = sizeof(struct icmp_echo_hdr) + reply->DataSize; + if ((reply->Options.Flags & IP_FLAG_DF) != 0 + && IP_HLEN + icmplen > pong->netif->mtu) + { + return; + } + + p = pbuf_alloc(PBUF_IP, (u16_t)icmplen, PBUF_RAM); + if (RT_UNLIKELY(p == NULL)) { + return; + } + + icmph = (struct icmp_echo_hdr *)p->payload; + icmph->type = ICMP_ER; + icmph->code = 0; + icmph->chksum = 0; + icmph->id = pong->reqicmph.id; + icmph->seqno = pong->reqicmph.seqno; + + memcpy((u8_t *)p->payload + sizeof(*icmph), + reply->Data, reply->DataSize); + } + else { + u8_t type, code; + + switch (reply->Status) { + case IP_DEST_NET_UNREACHABLE: + type = ICMP_DUR; code = ICMP_DUR_NET; + break; + case IP_DEST_HOST_UNREACHABLE: + type = ICMP_DUR; code = ICMP_DUR_HOST; + break; + case IP_DEST_PROT_UNREACHABLE: + type = ICMP_DUR; code = ICMP_DUR_PROTO; + break; + case IP_PACKET_TOO_BIG: + type = ICMP_DUR; code = ICMP_DUR_FRAG; + break; + case IP_SOURCE_QUENCH: + type = ICMP_SQ; code = 0; + break; + case IP_TTL_EXPIRED_TRANSIT: + type = ICMP_TE; code = ICMP_TE_TTL; + break; + case IP_TTL_EXPIRED_REASSEM: + type = ICMP_TE; code = ICMP_TE_FRAG; + break; + default: + DPRINTF(("pong4: reply status %d, dropped\n", reply->Status)); + return; + } + + DPRINTF(("pong4: reply status %d -> type %d/code %d\n", + reply->Status, type, code)); + + icmplen = sizeof(*icmph) + sizeof(pong->reqiph) + sizeof(pong->reqicmph); + + p = pbuf_alloc(PBUF_IP, (u16_t)icmplen, PBUF_RAM); + if (RT_UNLIKELY(p == NULL)) { + return; + } + + icmph = (struct icmp_echo_hdr *)p->payload; + icmph->type = type; + icmph->code = code; + icmph->chksum = 0; + icmph->id = 0; + icmph->seqno = 0; + + /* + * XXX: we don't know the TTL of the request at the time this + * ICMP error was generated (we can guess it was 1 for ttl + * exceeded, but don't bother faking it). + */ + memcpy((u8_t *)p->payload + sizeof(*icmph), + &pong->reqiph, sizeof(pong->reqiph)); + + memcpy((u8_t *)p->payload + sizeof(*icmph) + sizeof(pong->reqiph), + &pong->reqicmph, sizeof(pong->reqicmph)); + } + + icmph->chksum = inet_chksum(p->payload, (u16_t)icmplen); + ip_output_if(p, &src, + (ip_addr_t *)&pong->reqiph.src, /* dst */ + reply->Options.Ttl, + reply->Options.Tos, + IPPROTO_ICMP, + pong->netif); + pbuf_free(p); +} + + +static void +pxping_recv6(void *arg, struct pbuf *p) +{ + struct pxping *pxping = (struct pxping *)arg; + struct icmp6_echo_hdr *icmph; + size_t bufsize; + struct pong6 *pong; + int mapped; + void *reqdata; + size_t reqsize; + struct sockaddr_in6 src, dst; + int hopl; + IP_OPTION_INFORMATION opts; + int status; + + pong = NULL; + + icmph = (struct icmp6_echo_hdr *)p->payload; + + memset(&dst, 0, sizeof(dst)); + dst.sin6_family = AF_INET6; + mapped = pxremap_outbound_ip6((ip6_addr_t *)&dst.sin6_addr, + ip6_current_dest_addr()); + if (RT_UNLIKELY(mapped == PXREMAP_FAILED)) { + goto out; + } + + hopl = IP6H_HOPLIM(ip6_current_header()); + if (mapped == PXREMAP_ASIS) { + if (RT_UNLIKELY(hopl == 1)) { + status = pbuf_header(p, ip_current_header_tot_len()); + if (RT_LIKELY(status == 0)) { + icmp6_time_exceeded(p, ICMP6_TE_HL); + } + goto out; + } + --hopl; + } + + status = pbuf_header(p, -(u16_t)sizeof(*icmph)); /* to ping payload */ + if (RT_UNLIKELY(status != 0)) { + goto out; + } + + /* XXX: parrotted from IPv4 version, not tested all os version/bitness */ + bufsize = sizeof(ICMPV6_ECHO_REPLY); + if (p->tot_len < sizeof(IO_STATUS_BLOCK) + sizeof(struct icmp6_echo_hdr)) + bufsize += sizeof(IO_STATUS_BLOCK) + sizeof(struct icmp6_echo_hdr); + else + bufsize += p->tot_len; + bufsize += 16; + + pong = (struct pong6 *)malloc(RT_UOFFSETOF(struct pong6, buf) + bufsize); + if (RT_UNLIKELY(pong == NULL)) { + goto out; + } + pong->bufsize = bufsize; + pong->netif = pxping->netif; + + ip6_addr_copy(pong->reqsrc, *ip6_current_src_addr()); + memcpy(&pong->reqicmph, icmph, sizeof(*icmph)); + + memset(pong->buf, 0xa5, pong->bufsize); + + pong->reqsize = reqsize = p->tot_len; + if (p->next == NULL) { + /* single pbuf can be directly used as request data source */ + reqdata = p->payload; + } + else { + /* data from pbuf chain must be concatenated */ + pbuf_copy_partial(p, pong->buf, p->tot_len, 0); + reqdata = pong->buf; + } + + memset(&src, 0, sizeof(src)); + src.sin6_family = AF_INET6; + src.sin6_addr = in6addr_any; /* let the OS select host source address */ + + memset(&opts, 0, sizeof(opts)); + opts.Ttl = hopl; + + status = Icmp6SendEcho2(pxping->hdl6, NULL, + pxping->pfnCallback6, pong, + &src, &dst, reqdata, (WORD)reqsize, &opts, + pong->buf, (DWORD)pong->bufsize, + 5 * 1000 /* ms */); + + if (RT_UNLIKELY(status != 0)) { + DPRINTF(("Icmp6SendEcho2: unexpected status %d\n", status)); + goto out; + } + if ((status = GetLastError()) != ERROR_IO_PENDING) { + int code; + + DPRINTF(("Icmp6SendEcho2: error %d\n", status)); + switch (status) { + case ERROR_NETWORK_UNREACHABLE: + case ERROR_HOST_UNREACHABLE: + code = ICMP6_DUR_NO_ROUTE; + break; + default: + code = -1; + break; + } + + if (code != -1) { + /* move payload back to IP header */ + status = pbuf_header(p, (u16_t)(sizeof(*icmph) + + ip_current_header_tot_len())); + if (RT_LIKELY(status == 0)) { + icmp6_dest_unreach(p, code); + } + } + goto out; + } + + pong = NULL; /* callback owns it now */ + out: + if (pong != NULL) { + free(pong); + } + pbuf_free(p); +} + + +static VOID WINAPI +pxping_icmp6_callback_apc(void *ctx, PIO_STATUS_BLOCK iob, ULONG reserved) +{ + struct pong6 *pong = (struct pong6 *)ctx; + LWIP_UNUSED_ARG(iob); + LWIP_UNUSED_ARG(reserved); + + if (pong != NULL) { + pxping_icmp6_callback(pong); + free(pong); + } +} + + +static VOID WINAPI +pxping_icmp6_callback_old(void *ctx) +{ + struct pong6 *pong = (struct pong6 *)ctx; + + if (pong != NULL) { + pxping_icmp6_callback(pong); + free(pong); + } +} + + +static void +pxping_icmp6_callback(struct pong6 *pong) +{ + DWORD nreplies; + ICMPV6_ECHO_REPLY *reply; + struct pbuf *p; + struct icmp6_echo_hdr *icmph; + size_t icmplen; + ip6_addr_t src; + int mapped; + + nreplies = Icmp6ParseReplies(pong->buf, (DWORD)pong->bufsize); + if (nreplies == 0) { + DWORD error = GetLastError(); + if (error == IP_REQ_TIMED_OUT) { + DPRINTF2(("pong6: %p timed out\n", (void *)pong)); + } + else { + DPRINTF(("pong6: %p: Icmp6ParseReplies: error %d\n", + (void *)pong, error)); + } + return; + } + + reply = (ICMPV6_ECHO_REPLY *)pong->buf; + + mapped = pxremap_inbound_ip6(&src, (ip6_addr_t *)reply->Address.sin6_addr); + if (mapped == PXREMAP_FAILED) { + return; + } + + /* + * Reply data follows ICMPV6_ECHO_REPLY structure in memory, but + * it doesn't tell us its size. Assume it's equal the size of the + * request. + */ + icmplen = sizeof(*icmph) + pong->reqsize; + p = pbuf_alloc(PBUF_IP, (u16_t)icmplen, PBUF_RAM); + if (RT_UNLIKELY(p == NULL)) { + return; + } + + icmph = (struct icmp6_echo_hdr *)p->payload; + icmph->type = ICMP6_TYPE_EREP; + icmph->code = 0; + icmph->chksum = 0; + icmph->id = pong->reqicmph.id; + icmph->seqno = pong->reqicmph.seqno; + + memcpy((u8_t *)p->payload + sizeof(*icmph), + pong->buf + sizeof(*reply), pong->reqsize); + + icmph->chksum = ip6_chksum_pseudo(p, IP6_NEXTH_ICMP6, p->tot_len, + &src, &pong->reqsrc); + ip6_output_if(p, /* :src */ &src, /* :dst */ &pong->reqsrc, + LWIP_ICMP6_HL, 0, IP6_NEXTH_ICMP6, + pong->netif); + pbuf_free(p); +} diff --git a/src/VBox/NetworkServices/NAT/pxremap.c b/src/VBox/NetworkServices/NAT/pxremap.c new file mode 100644 index 00000000..04d96591 --- /dev/null +++ b/src/VBox/NetworkServices/NAT/pxremap.c @@ -0,0 +1,333 @@ +/* $Id: pxremap.c $ */ +/** @file + * NAT Network - Loopback remapping. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +/* + * This file contains functions pertinent to magic address remapping. + * + * We want to expose host's loopback interfaces to the guest by + * mapping them to the addresses from the same prefix/subnet, so if, + * for example proxy interface is 10.0.2.1, we redirect traffic to + * 10.0.2.2 to host's 127.0.0.1 loopback. If need be, we may extend + * this to provide additional mappings, e.g. 127.0.1.1 loopback + * address is used on Ubuntu 12.10+ for NetworkManager's dnsmasq. + * + * Ditto for IPv6, except that IPv6 only has one loopback address. + */ +#define LOG_GROUP LOG_GROUP_NAT_SERVICE + +#include "winutils.h" +#include "pxremap.h" +#include "proxy.h" + +#include "lwip/netif.h" +#include "netif/etharp.h" /* proxy arp hook */ + +#include "lwip/ip4.h" /* IPv4 divert hook */ +#include "lwip/ip6.h" /* IPv6 divert hook */ + +#include <string.h> + + +/** + * Check if "dst" is an IPv4 address that proxy remaps to host's + * loopback. + */ +static int +proxy_ip4_is_mapped_loopback(struct netif *netif, const ip_addr_t *dst, ip_addr_t *lo) +{ + u32_t off; + const struct ip4_lomap *lomap; + size_t i; + + LWIP_ASSERT1(dst != NULL); + + if (g_proxy_options->lomap_desc == NULL) { + return 0; + } + + if (!ip_addr_netcmp(dst, &netif->ip_addr, &netif->netmask)) { + return 0; + } + + /* XXX: TODO: check netif is a proxying netif! */ + + off = ntohl(ip4_addr_get_u32(dst) & ~ip4_addr_get_u32(&netif->netmask)); + lomap = g_proxy_options->lomap_desc->lomap; + for (i = 0; i < g_proxy_options->lomap_desc->num_lomap; ++i) { + if (off == lomap[i].off) { + if (lo != NULL) { + ip_addr_copy(*lo, lomap[i].loaddr); + } + return 1; + } + } + return 0; +} + + +#if ARP_PROXY +/** + * Hook function for etharp_arp_input() - returns true to cause proxy + * ARP reply to be generated for "dst". + */ +int +pxremap_proxy_arp(struct netif *netif, ip_addr_t *dst) +{ + return proxy_ip4_is_mapped_loopback(netif, dst, NULL); +} +#endif /* ARP_PROXY */ + + +/** + * Hook function for ip_forward() - returns true to divert packets to + * "dst" to proxy (instead of forwarding them via "netif" or dropping). + */ +int +pxremap_ip4_divert(struct netif *netif, ip_addr_t *dst) +{ + return proxy_ip4_is_mapped_loopback(netif, dst, NULL); +} + + +/** + * Mapping from local network to loopback for outbound connections. + * + * Copy "src" to "dst" with ip_addr_set(dst, src), but if "src" is a + * local network address that maps host's loopback address, copy + * loopback address to "dst". + */ +int +pxremap_outbound_ip4(ip_addr_t *dst, ip_addr_t *src) +{ + struct netif *netif; + + LWIP_ASSERT1(dst != NULL); + LWIP_ASSERT1(src != NULL); + + for (netif = netif_list; netif != NULL; netif = netif->next) { + if (netif_is_up(netif) /* && this is a proxy netif */) { + if (proxy_ip4_is_mapped_loopback(netif, src, dst)) { + return PXREMAP_MAPPED; + } + } + } + + /* not remapped, just copy src */ + ip_addr_set(dst, src); + return PXREMAP_ASIS; +} + + +/** + * Mapping from loopback to local network for inbound (port-forwarded) + * connections. + * + * Copy "src" to "dst" with ip_addr_set(dst, src), but if "src" is a + * host's loopback address, copy local network address that maps it to + * "dst". + */ +int +pxremap_inbound_ip4(ip_addr_t *dst, ip_addr_t *src) +{ + struct netif *netif; + const struct ip4_lomap *lomap; + unsigned int i; + + if (ip4_addr1(src) != IP_LOOPBACKNET) { + ip_addr_set(dst, src); + return PXREMAP_ASIS; + } + + if (g_proxy_options->lomap_desc == NULL) { + return PXREMAP_FAILED; + } + +#if 0 /* ?TODO: with multiple interfaces we need to consider fwspec::dst */ + netif = ip_route(target); + if (netif == NULL) { + return PXREMAP_FAILED; + } +#else + netif = netif_list; + LWIP_ASSERT1(netif != NULL); + LWIP_ASSERT1(netif->next == NULL); +#endif + + lomap = g_proxy_options->lomap_desc->lomap; + for (i = 0; i < g_proxy_options->lomap_desc->num_lomap; ++i) { + if (ip_addr_cmp(src, &lomap[i].loaddr)) { + ip_addr_t net; + + ip_addr_get_network(&net, &netif->ip_addr, &netif->netmask); + ip4_addr_set_u32(dst, + htonl(ntohl(ip4_addr_get_u32(&net)) + + lomap[i].off)); + return PXREMAP_MAPPED; + } + } + + return PXREMAP_FAILED; +} + + +static int +proxy_ip6_is_mapped_loopback(struct netif *netif, ip6_addr_t *dst) +{ + int i; + + /* XXX: TODO: check netif is a proxying netif! */ + + LWIP_ASSERT1(dst != NULL); + + for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; ++i) { + if (ip6_addr_ispreferred(netif_ip6_addr_state(netif, i)) + && ip6_addr_isuniquelocal(netif_ip6_addr(netif, i))) + { + ip6_addr_t *ifaddr = netif_ip6_addr(netif, i); + if (memcmp(dst, ifaddr, sizeof(ip6_addr_t) - 1) == 0 + && ((IP6_ADDR_BLOCK8(dst) & 0xff) + == (IP6_ADDR_BLOCK8(ifaddr) & 0xff) + 1)) + { + return 1; + } + } + } + + return 0; +} + + +/** + * Hook function for nd6_input() - returns true to cause proxy NA + * reply to be generated for "dst". + */ +int +pxremap_proxy_na(struct netif *netif, ip6_addr_t *dst) +{ + return proxy_ip6_is_mapped_loopback(netif, dst); +} + + +/** + * Hook function for ip6_forward() - returns true to divert packets to + * "dst" to proxy (instead of forwarding them via "netif" or dropping). + */ +int +pxremap_ip6_divert(struct netif *netif, ip6_addr_t *dst) +{ + return proxy_ip6_is_mapped_loopback(netif, dst); +} + + +/** + * Mapping from local network to loopback for outbound connections. + * + * Copy "src" to "dst" with ip6_addr_set(dst, src), but if "src" is a + * local network address that maps host's loopback address, copy IPv6 + * loopback address to "dst". + */ +int +pxremap_outbound_ip6(ip6_addr_t *dst, ip6_addr_t *src) +{ + struct netif *netif; + int i; + + LWIP_ASSERT1(dst != NULL); + LWIP_ASSERT1(src != NULL); + + for (netif = netif_list; netif != NULL; netif = netif->next) { + if (!netif_is_up(netif) /* || this is not a proxy netif */) { + continue; + } + + for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; ++i) { + if (ip6_addr_ispreferred(netif_ip6_addr_state(netif, i)) + && ip6_addr_isuniquelocal(netif_ip6_addr(netif, i))) + { + ip6_addr_t *ifaddr = netif_ip6_addr(netif, i); + if (memcmp(src, ifaddr, sizeof(ip6_addr_t) - 1) == 0 + && ((IP6_ADDR_BLOCK8(src) & 0xff) + == (IP6_ADDR_BLOCK8(ifaddr) & 0xff) + 1)) + { + ip6_addr_set_loopback(dst); + return PXREMAP_MAPPED; + } + } + } + } + + /* not remapped, just copy src */ + ip6_addr_set(dst, src); + return PXREMAP_ASIS; +} + + +/** + * Mapping from loopback to local network for inbound (port-forwarded) + * connections. + * + * Copy "src" to "dst" with ip6_addr_set(dst, src), but if "src" is a + * host's loopback address, copy local network address that maps it to + * "dst". + */ +int +pxremap_inbound_ip6(ip6_addr_t *dst, ip6_addr_t *src) +{ + ip6_addr_t loopback; + struct netif *netif; + int i; + + ip6_addr_set_loopback(&loopback); + if (!ip6_addr_cmp(src, &loopback)) { + ip6_addr_set(dst, src); + return PXREMAP_ASIS; + } + +#if 0 /* ?TODO: with multiple interfaces we need to consider fwspec::dst */ + netif = ip6_route_fwd(target); + if (netif == NULL) { + return PXREMAP_FAILED; + } +#else + netif = netif_list; + LWIP_ASSERT1(netif != NULL); + LWIP_ASSERT1(netif->next == NULL); +#endif + + for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; ++i) { + ip6_addr_t *ifaddr = netif_ip6_addr(netif, i); + if (ip6_addr_ispreferred(netif_ip6_addr_state(netif, i)) + && ip6_addr_isuniquelocal(ifaddr)) + { + ip6_addr_set(dst, ifaddr); + ++((u8_t *)&dst->addr[3])[3]; + return PXREMAP_MAPPED; + } + } + + return PXREMAP_FAILED; +} diff --git a/src/VBox/NetworkServices/NAT/pxremap.h b/src/VBox/NetworkServices/NAT/pxremap.h new file mode 100644 index 00000000..b99d8111 --- /dev/null +++ b/src/VBox/NetworkServices/NAT/pxremap.h @@ -0,0 +1,62 @@ +/* $Id: pxremap.h $ */ +/** @file + * NAT Network - Loopback remapping, declarations and definitions. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#ifndef VBOX_INCLUDED_SRC_NAT_pxremap_h +#define VBOX_INCLUDED_SRC_NAT_pxremap_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#include "lwip/err.h" +#include "lwip/ip_addr.h" + +struct netif; + + +#define PXREMAP_FAILED (-1) +#define PXREMAP_ASIS 0 +#define PXREMAP_MAPPED 1 + +/* IPv4 */ +#if ARP_PROXY +int pxremap_proxy_arp(struct netif *netif, ip_addr_t *dst); +#endif +int pxremap_ip4_divert(struct netif *netif, ip_addr_t *dst); +int pxremap_outbound_ip4(ip_addr_t *dst, ip_addr_t *src); +int pxremap_inbound_ip4(ip_addr_t *dst, ip_addr_t *src); + +/* IPv6 */ +int pxremap_proxy_na(struct netif *netif, ip6_addr_t *dst); +int pxremap_ip6_divert(struct netif *netif, ip6_addr_t *dst); +int pxremap_outbound_ip6(ip6_addr_t *dst, ip6_addr_t *src); +int pxremap_inbound_ip6(ip6_addr_t *dst, ip6_addr_t *src); + +#define pxremap_outbound_ipX(is_ipv6, dst, src) \ + ((is_ipv6) ? pxremap_outbound_ip6(&(dst)->ip6, &(src)->ip6) \ + : pxremap_outbound_ip4(&(dst)->ip4, &(src)->ip4)) + +#endif /* !VBOX_INCLUDED_SRC_NAT_pxremap_h */ diff --git a/src/VBox/NetworkServices/NAT/pxtcp.c b/src/VBox/NetworkServices/NAT/pxtcp.c new file mode 100644 index 00000000..716e9aff --- /dev/null +++ b/src/VBox/NetworkServices/NAT/pxtcp.c @@ -0,0 +1,2524 @@ +/* $Id: pxtcp.c $ */ +/** @file + * NAT Network - TCP proxy. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#define LOG_GROUP LOG_GROUP_NAT_SERVICE + +#include "winutils.h" + +#include "pxtcp.h" + +#include "proxy.h" +#include "proxy_pollmgr.h" +#include "pxremap.h" +#include "portfwd.h" /* fwspec */ + +#ifndef RT_OS_WINDOWS +#include <sys/types.h> +#include <sys/socket.h> +#include <sys/ioctl.h> +#ifdef RT_OS_SOLARIS +#include <sys/filio.h> /* FIONREAD is BSD'ism */ +#endif +#include <stdlib.h> +#include <stdint.h> +#include <stdio.h> +#include <string.h> +#include <poll.h> + +#include <err.h> /* BSD'ism */ +#else +#include <stdlib.h> +#include <stdio.h> +#include <string.h> + +#include <iprt/stdint.h> +#include "winpoll.h" +#endif + +#include "lwip/opt.h" + +#include "lwip/sys.h" +#include "lwip/tcpip.h" +#include "lwip/netif.h" +#include "lwip/tcp_impl.h" /* XXX: to access tcp_abandon() */ +#include "lwip/icmp.h" +#include "lwip/icmp6.h" + +/* + * Different OSes have different quirks in reporting POLLHUP for TCP + * sockets. + * + * Using shutdown(2) "how" values here would be more readable, but + * since SHUT_RD is 0, we can't use 0 for "none", unfortunately. + */ +#if defined(RT_OS_NETBSD) || defined(RT_OS_SOLARIS) +# define HAVE_TCP_POLLHUP 0 /* not reported */ +#elif defined(RT_OS_DARWIN) || defined(RT_OS_WINDOWS) +# define HAVE_TCP_POLLHUP POLLIN /* reported when remote closes */ +#else +# define HAVE_TCP_POLLHUP (POLLIN|POLLOUT) /* reported when both directions are closed */ +#endif + + +/** + * Ring buffer for inbound data. Filled with data from the host + * socket on poll manager thread. Data consumed by scheduling + * tcp_write() to the pcb on the lwip thread. + * + * NB: There is actually third party present, the lwip stack itself. + * Thus the buffer doesn't have dual free vs. data split, but rather + * three-way free / send and unACKed data / unsent data split. + */ +struct ringbuf { + char *buf; + size_t bufsize; + + /* + * Start of free space, producer writes here (up till "unacked"). + */ + volatile size_t vacant; + + /* + * Start of sent but unacknowledged data. The data are "owned" by + * the stack as it may need to retransmit. This is the free space + * limit for producer. + */ + volatile size_t unacked; + + /* + * Start of unsent data, consumer reads/sends from here (up till + * "vacant"). Not declared volatile since it's only accessed from + * the consumer thread. + */ + size_t unsent; +}; + + +/** + */ +struct pxtcp { + /** + * Our poll manager handler. Must be first, strong/weak + * references depend on this "inheritance". + */ + struct pollmgr_handler pmhdl; + + /** + * lwIP (internal/guest) side of the proxied connection. + */ + struct tcp_pcb *pcb; + + /** + * Host (external) side of the proxied connection. + */ + SOCKET sock; + + /** + * Socket events we are currently polling for. + */ + int events; + + /** + * Socket error. Currently used to save connect(2) errors so that + * we can decide if we need to send ICMP error. + */ + int sockerr; + + /** + * Interface that we have got the SYN from. Needed to send ICMP + * with correct source address. + */ + struct netif *netif; + + /** + * For tentatively accepted connections for which we are in + * process of connecting to the real destination this is the + * initial pbuf that we might need to build ICMP error. + * + * When connection is established this is used to hold outbound + * pbuf chain received by pxtcp_pcb_recv() but not yet completely + * forwarded over the socket. We cannot "return" it to lwIP since + * the head of the chain is already sent and freed. + */ + struct pbuf *unsent; + + /** + * Guest has closed its side. Reported to pxtcp_pcb_recv() only + * once and we might not be able to forward it immediately if we + * have unsent pbuf. + */ + int outbound_close; + + /** + * Outbound half-close has been done on the socket. + */ + int outbound_close_done; + + /** + * External has closed its side. We might not be able to forward + * it immediately if we have unforwarded data. + */ + int inbound_close; + + /** + * Inbound half-close has been done on the pcb. + */ + int inbound_close_done; + + /** + * On systems that report POLLHUP as soon as the final FIN is + * received on a socket we cannot continue polling for the rest of + * input, so we have to read (pull) last data from the socket on + * the lwIP thread instead of polling/pushing it from the poll + * manager thread. See comment in pxtcp_pmgr_pump() POLLHUP case. + */ + int inbound_pull; + + + /** + * When poll manager schedules delete we may not be able to delete + * a pxtcp immediately if not all inbound data has been acked by + * the guest: lwIP may need to resend and the data are in pxtcp's + * inbuf::buf. We defer delete until all data are acked to + * pxtcp_pcb_sent(). + */ + int deferred_delete; + + /** + * Ring-buffer for inbound data. + */ + struct ringbuf inbuf; + + /** + * lwIP thread's strong reference to us. + */ + struct pollmgr_refptr *rp; + + + /* + * We use static messages to call functions on the lwIP thread to + * void malloc/free overhead. + */ + struct tcpip_msg msg_delete; /* delete pxtcp */ + struct tcpip_msg msg_reset; /* reset connection and delete pxtcp */ + struct tcpip_msg msg_accept; /* confirm accept of proxied connection */ + struct tcpip_msg msg_outbound; /* trigger send of outbound data */ + struct tcpip_msg msg_inbound; /* trigger send of inbound data */ +#if HAVE_TCP_POLLHUP + struct tcpip_msg msg_inpull; /* trigger pull of last inbound data */ +#endif +}; + + + +static struct pxtcp *pxtcp_allocate(void); +static void pxtcp_free(struct pxtcp *); + +static void pxtcp_pcb_associate(struct pxtcp *, struct tcp_pcb *); +static void pxtcp_pcb_dissociate(struct pxtcp *); + +/* poll manager callbacks for pxtcp related channels */ +static int pxtcp_pmgr_chan_add(struct pollmgr_handler *, SOCKET, int); +static int pxtcp_pmgr_chan_pollout(struct pollmgr_handler *, SOCKET, int); +static int pxtcp_pmgr_chan_pollin(struct pollmgr_handler *, SOCKET, int); +#if !(HAVE_TCP_POLLHUP & POLLOUT) +static int pxtcp_pmgr_chan_del(struct pollmgr_handler *, SOCKET, int); +#endif +static int pxtcp_pmgr_chan_reset(struct pollmgr_handler *, SOCKET, int); + +/* helper functions for sending/receiving pxtcp over poll manager channels */ +static ssize_t pxtcp_chan_send(enum pollmgr_slot_t, struct pxtcp *); +static ssize_t pxtcp_chan_send_weak(enum pollmgr_slot_t, struct pxtcp *); +static struct pxtcp *pxtcp_chan_recv(struct pollmgr_handler *, SOCKET, int); +static struct pxtcp *pxtcp_chan_recv_strong(struct pollmgr_handler *, SOCKET, int); + +/* poll manager callbacks for individual sockets */ +static int pxtcp_pmgr_connect(struct pollmgr_handler *, SOCKET, int); +static int pxtcp_pmgr_pump(struct pollmgr_handler *, SOCKET, int); + +/* get incoming traffic into ring buffer */ +static ssize_t pxtcp_sock_read(struct pxtcp *, int *); +static ssize_t pxtcp_sock_recv(struct pxtcp *, IOVEC *, size_t); /* default */ + +/* convenience functions for poll manager callbacks */ +static int pxtcp_schedule_delete(struct pxtcp *); +static int pxtcp_schedule_reset(struct pxtcp *); +static int pxtcp_schedule_reject(struct pxtcp *); + +/* lwip thread callbacks called via proxy_lwip_post() */ +static void pxtcp_pcb_delete_pxtcp(void *); +static void pxtcp_pcb_reset_pxtcp(void *); +static void pxtcp_pcb_accept_refuse(void *); +static void pxtcp_pcb_accept_confirm(void *); +static void pxtcp_pcb_write_outbound(void *); +static void pxtcp_pcb_write_inbound(void *); +#if HAVE_TCP_POLLHUP +static void pxtcp_pcb_pull_inbound(void *); +#endif + +/* tcp pcb callbacks */ +static err_t pxtcp_pcb_heard(void *, struct tcp_pcb *, struct pbuf *); /* global */ +static err_t pxtcp_pcb_accept(void *, struct tcp_pcb *, err_t); +static err_t pxtcp_pcb_connected(void *, struct tcp_pcb *, err_t); +static err_t pxtcp_pcb_recv(void *, struct tcp_pcb *, struct pbuf *, err_t); +static err_t pxtcp_pcb_sent(void *, struct tcp_pcb *, u16_t); +static err_t pxtcp_pcb_poll(void *, struct tcp_pcb *); +static void pxtcp_pcb_err(void *, err_t); + +static err_t pxtcp_pcb_forward_outbound(struct pxtcp *, struct pbuf *); +static void pxtcp_pcb_forward_outbound_close(struct pxtcp *); + +static ssize_t pxtcp_sock_send(struct pxtcp *, IOVEC *, size_t); + +static void pxtcp_pcb_forward_inbound(struct pxtcp *); +static void pxtcp_pcb_forward_inbound_close(struct pxtcp *); +DECLINLINE(int) pxtcp_pcb_forward_inbound_done(const struct pxtcp *); +static void pxtcp_pcb_schedule_poll(struct pxtcp *); +static void pxtcp_pcb_cancel_poll(struct pxtcp *); + +static void pxtcp_pcb_reject(struct tcp_pcb *, int, struct netif *, struct pbuf *); +DECLINLINE(void) pxtcp_pcb_maybe_deferred_delete(struct pxtcp *); + +/* poll manager handlers for pxtcp channels */ +static struct pollmgr_handler pxtcp_pmgr_chan_add_hdl; +static struct pollmgr_handler pxtcp_pmgr_chan_pollout_hdl; +static struct pollmgr_handler pxtcp_pmgr_chan_pollin_hdl; +#if !(HAVE_TCP_POLLHUP & POLLOUT) +static struct pollmgr_handler pxtcp_pmgr_chan_del_hdl; +#endif +static struct pollmgr_handler pxtcp_pmgr_chan_reset_hdl; + + +/** + * Init PXTCP - must be run when neither lwIP tcpip thread, nor poll + * manager threads haven't been created yet. + */ +void +pxtcp_init(void) +{ + /* + * Create channels. + */ +#define CHANNEL(SLOT, NAME) do { \ + NAME##_hdl.callback = NAME; \ + NAME##_hdl.data = NULL; \ + NAME##_hdl.slot = -1; \ + pollmgr_add_chan(SLOT, &NAME##_hdl); \ + } while (0) + + CHANNEL(POLLMGR_CHAN_PXTCP_ADD, pxtcp_pmgr_chan_add); + CHANNEL(POLLMGR_CHAN_PXTCP_POLLIN, pxtcp_pmgr_chan_pollin); + CHANNEL(POLLMGR_CHAN_PXTCP_POLLOUT, pxtcp_pmgr_chan_pollout); +#if !(HAVE_TCP_POLLHUP & POLLOUT) + CHANNEL(POLLMGR_CHAN_PXTCP_DEL, pxtcp_pmgr_chan_del); +#endif + CHANNEL(POLLMGR_CHAN_PXTCP_RESET, pxtcp_pmgr_chan_reset); + +#undef CHANNEL + + /* + * Listen to outgoing connection from guest(s). + */ + tcp_proxy_accept(pxtcp_pcb_heard); +} + + +/** + * Syntactic sugar for sending pxtcp pointer over poll manager + * channel. Used by lwip thread functions. + */ +static ssize_t +pxtcp_chan_send(enum pollmgr_slot_t slot, struct pxtcp *pxtcp) +{ + return pollmgr_chan_send(slot, &pxtcp, sizeof(pxtcp)); +} + + +/** + * Syntactic sugar for sending weak reference to pxtcp over poll + * manager channel. Used by lwip thread functions. + */ +static ssize_t +pxtcp_chan_send_weak(enum pollmgr_slot_t slot, struct pxtcp *pxtcp) +{ + pollmgr_refptr_weak_ref(pxtcp->rp); + return pollmgr_chan_send(slot, &pxtcp->rp, sizeof(pxtcp->rp)); +} + + +/** + * Counterpart of pxtcp_chan_send(). + */ +static struct pxtcp * +pxtcp_chan_recv(struct pollmgr_handler *handler, SOCKET fd, int revents) +{ + struct pxtcp *pxtcp; + + pxtcp = (struct pxtcp *)pollmgr_chan_recv_ptr(handler, fd, revents); + return pxtcp; +} + + +/** + * Counterpart of pxtcp_chan_send_weak(). + */ +static struct pxtcp * +pxtcp_chan_recv_strong(struct pollmgr_handler *handler, SOCKET fd, int revents) +{ + struct pollmgr_refptr *rp; + struct pollmgr_handler *base; + struct pxtcp *pxtcp; + + rp = (struct pollmgr_refptr *)pollmgr_chan_recv_ptr(handler, fd, revents); + base = (struct pollmgr_handler *)pollmgr_refptr_get(rp); + pxtcp = (struct pxtcp *)base; + + return pxtcp; +} + + +/** + * Register pxtcp with poll manager. + * + * Used for POLLMGR_CHAN_PXTCP_ADD and by port-forwarding. Since + * error handling is different in these two cases, we leave it up to + * the caller. + */ +int +pxtcp_pmgr_add(struct pxtcp *pxtcp) +{ + int status; + + LWIP_ASSERT1(pxtcp != NULL); +#ifdef RT_OS_WINDOWS + LWIP_ASSERT1(pxtcp->sock != INVALID_SOCKET); +#else + LWIP_ASSERT1(pxtcp->sock >= 0); +#endif + LWIP_ASSERT1(pxtcp->pmhdl.callback != NULL); + LWIP_ASSERT1(pxtcp->pmhdl.data == (void *)pxtcp); + LWIP_ASSERT1(pxtcp->pmhdl.slot < 0); + + status = pollmgr_add(&pxtcp->pmhdl, pxtcp->sock, pxtcp->events); + return status; +} + + +/** + * Unregister pxtcp with poll manager. + * + * Used for POLLMGR_CHAN_PXTCP_RESET and by port-forwarding (on error + * leg). + */ +void +pxtcp_pmgr_del(struct pxtcp *pxtcp) +{ + LWIP_ASSERT1(pxtcp != NULL); + + pollmgr_del_slot(pxtcp->pmhdl.slot); +} + + +/** + * POLLMGR_CHAN_PXTCP_ADD handler. + * + * Get new pxtcp from lwip thread and start polling its socket. + */ +static int +pxtcp_pmgr_chan_add(struct pollmgr_handler *handler, SOCKET fd, int revents) +{ + struct pxtcp *pxtcp; + int status; + + pxtcp = pxtcp_chan_recv(handler, fd, revents); + DPRINTF0(("pxtcp_add: new pxtcp %p; pcb %p; sock %d\n", + (void *)pxtcp, (void *)pxtcp->pcb, pxtcp->sock)); + + status = pxtcp_pmgr_add(pxtcp); + if (status < 0) { + (void) pxtcp_schedule_reset(pxtcp); + } + + return POLLIN; +} + + +/** + * POLLMGR_CHAN_PXTCP_POLLOUT handler. + * + * pxtcp_pcb_forward_outbound() on the lwIP thread tried to send data + * and failed, it now requests us to poll the socket for POLLOUT and + * schedule pxtcp_pcb_forward_outbound() when sock is writable again. + */ +static int +pxtcp_pmgr_chan_pollout(struct pollmgr_handler *handler, SOCKET fd, int revents) +{ + struct pxtcp *pxtcp; + + pxtcp = pxtcp_chan_recv_strong(handler, fd, revents); + DPRINTF0(("pxtcp_pollout: pxtcp %p\n", (void *)pxtcp)); + + if (pxtcp == NULL) { + return POLLIN; + } + + LWIP_ASSERT1(pxtcp->pmhdl.data == (void *)pxtcp); + LWIP_ASSERT1(pxtcp->pmhdl.slot > 0); + + pxtcp->events |= POLLOUT; + pollmgr_update_events(pxtcp->pmhdl.slot, pxtcp->events); + + return POLLIN; +} + + +/** + * POLLMGR_CHAN_PXTCP_POLLIN handler. + */ +static int +pxtcp_pmgr_chan_pollin(struct pollmgr_handler *handler, SOCKET fd, int revents) +{ + struct pxtcp *pxtcp; + + pxtcp = pxtcp_chan_recv_strong(handler, fd, revents); + DPRINTF2(("pxtcp_pollin: pxtcp %p\n", (void *)pxtcp)); + + if (pxtcp == NULL) { + return POLLIN; + } + + LWIP_ASSERT1(pxtcp->pmhdl.data == (void *)pxtcp); + LWIP_ASSERT1(pxtcp->pmhdl.slot > 0); + + if (pxtcp->inbound_close) { + return POLLIN; + } + + pxtcp->events |= POLLIN; + pollmgr_update_events(pxtcp->pmhdl.slot, pxtcp->events); + + return POLLIN; +} + + +#if !(HAVE_TCP_POLLHUP & POLLOUT) +/** + * POLLMGR_CHAN_PXTCP_DEL handler. + * + * Schedule pxtcp deletion. We only need this if host system doesn't + * report POLLHUP for fully closed tcp sockets. + */ +static int +pxtcp_pmgr_chan_del(struct pollmgr_handler *handler, SOCKET fd, int revents) +{ + struct pxtcp *pxtcp; + + pxtcp = pxtcp_chan_recv_strong(handler, fd, revents); + if (pxtcp == NULL) { + return POLLIN; + } + + DPRINTF(("PXTCP_DEL: pxtcp %p; pcb %p; sock %d\n", + (void *)pxtcp, (void *)pxtcp->pcb, pxtcp->sock)); + + LWIP_ASSERT1(pxtcp->pmhdl.callback != NULL); + LWIP_ASSERT1(pxtcp->pmhdl.data == (void *)pxtcp); + + LWIP_ASSERT1(pxtcp->inbound_close); /* EOF read */ + LWIP_ASSERT1(pxtcp->outbound_close_done); /* EOF sent */ + + pxtcp_pmgr_del(pxtcp); + (void) pxtcp_schedule_delete(pxtcp); + + return POLLIN; +} +#endif /* !(HAVE_TCP_POLLHUP & POLLOUT) */ + + +/** + * POLLMGR_CHAN_PXTCP_RESET handler. + * + * Close the socket with RST and delete pxtcp. + */ +static int +pxtcp_pmgr_chan_reset(struct pollmgr_handler *handler, SOCKET fd, int revents) +{ + struct pxtcp *pxtcp; + + pxtcp = pxtcp_chan_recv_strong(handler, fd, revents); + if (pxtcp == NULL) { + return POLLIN; + } + + DPRINTF0(("PXTCP_RESET: pxtcp %p; pcb %p; sock %d\n", + (void *)pxtcp, (void *)pxtcp->pcb, pxtcp->sock)); + + LWIP_ASSERT1(pxtcp->pmhdl.callback != NULL); + LWIP_ASSERT1(pxtcp->pmhdl.data == (void *)pxtcp); + + pxtcp_pmgr_del(pxtcp); + + proxy_reset_socket(pxtcp->sock); + pxtcp->sock = INVALID_SOCKET; + + (void) pxtcp_schedule_reset(pxtcp); + + return POLLIN; +} + + +static struct pxtcp * +pxtcp_allocate(void) +{ + struct pxtcp *pxtcp; + + pxtcp = (struct pxtcp *)malloc(sizeof(*pxtcp)); + if (pxtcp == NULL) { + return NULL; + } + + pxtcp->pmhdl.callback = NULL; + pxtcp->pmhdl.data = (void *)pxtcp; + pxtcp->pmhdl.slot = -1; + + pxtcp->pcb = NULL; + pxtcp->sock = INVALID_SOCKET; + pxtcp->events = 0; + pxtcp->sockerr = 0; + pxtcp->netif = NULL; + pxtcp->unsent = NULL; + pxtcp->outbound_close = 0; + pxtcp->outbound_close_done = 0; + pxtcp->inbound_close = 0; + pxtcp->inbound_close_done = 0; + pxtcp->inbound_pull = 0; + pxtcp->deferred_delete = 0; + + pxtcp->inbuf.bufsize = 64 * 1024; + pxtcp->inbuf.buf = (char *)malloc(pxtcp->inbuf.bufsize); + if (pxtcp->inbuf.buf == NULL) { + free(pxtcp); + return NULL; + } + pxtcp->inbuf.vacant = 0; + pxtcp->inbuf.unacked = 0; + pxtcp->inbuf.unsent = 0; + + pxtcp->rp = pollmgr_refptr_create(&pxtcp->pmhdl); + if (pxtcp->rp == NULL) { + free(pxtcp->inbuf.buf); + free(pxtcp); + return NULL; + } + +#define CALLBACK_MSG(MSG, FUNC) \ + do { \ + pxtcp->MSG.type = TCPIP_MSG_CALLBACK_STATIC; \ + pxtcp->MSG.sem = NULL; \ + pxtcp->MSG.msg.cb.function = FUNC; \ + pxtcp->MSG.msg.cb.ctx = (void *)pxtcp; \ + } while (0) + + CALLBACK_MSG(msg_delete, pxtcp_pcb_delete_pxtcp); + CALLBACK_MSG(msg_reset, pxtcp_pcb_reset_pxtcp); + CALLBACK_MSG(msg_accept, pxtcp_pcb_accept_confirm); + CALLBACK_MSG(msg_outbound, pxtcp_pcb_write_outbound); + CALLBACK_MSG(msg_inbound, pxtcp_pcb_write_inbound); +#if HAVE_TCP_POLLHUP + CALLBACK_MSG(msg_inpull, pxtcp_pcb_pull_inbound); +#endif + +#undef CALLBACK_MSG + + return pxtcp; +} + + +/** + * Exported to fwtcp to create pxtcp for incoming port-forwarded + * connections. Completed with pcb in pxtcp_pcb_connect(). + */ +struct pxtcp * +pxtcp_create_forwarded(SOCKET sock) +{ + struct pxtcp *pxtcp; + + pxtcp = pxtcp_allocate(); + if (pxtcp == NULL) { + return NULL; + } + + pxtcp->sock = sock; + pxtcp->pmhdl.callback = pxtcp_pmgr_pump; + pxtcp->events = 0; + + return pxtcp; +} + + +static void +pxtcp_pcb_associate(struct pxtcp *pxtcp, struct tcp_pcb *pcb) +{ + LWIP_ASSERT1(pxtcp != NULL); + LWIP_ASSERT1(pcb != NULL); + + pxtcp->pcb = pcb; + + tcp_arg(pcb, pxtcp); + + tcp_recv(pcb, pxtcp_pcb_recv); + tcp_sent(pcb, pxtcp_pcb_sent); + tcp_poll(pcb, NULL, 255); + tcp_err(pcb, pxtcp_pcb_err); +} + + +static void +pxtcp_free(struct pxtcp *pxtcp) +{ + if (pxtcp->unsent != NULL) { + pbuf_free(pxtcp->unsent); + } + if (pxtcp->inbuf.buf != NULL) { + free(pxtcp->inbuf.buf); + } + free(pxtcp); +} + + +/** + * Counterpart to pxtcp_create_forwarded() to destruct pxtcp that + * fwtcp failed to register with poll manager to post to lwip thread + * for doing connect. + */ +void +pxtcp_cancel_forwarded(struct pxtcp *pxtcp) +{ + LWIP_ASSERT1(pxtcp->pcb == NULL); + pxtcp_pcb_reset_pxtcp(pxtcp); +} + + +static void +pxtcp_pcb_dissociate(struct pxtcp *pxtcp) +{ + if (pxtcp == NULL || pxtcp->pcb == NULL) { + return; + } + + DPRINTF(("%s: pxtcp %p <-> pcb %p\n", + __func__, (void *)pxtcp, (void *)pxtcp->pcb)); + + /* + * We must have dissociated from a fully closed pcb immediately + * since lwip recycles them and we don't wan't to mess with what + * would be someone else's pcb that we happen to have a stale + * pointer to. + */ + LWIP_ASSERT1(pxtcp->pcb->callback_arg == pxtcp); + + tcp_recv(pxtcp->pcb, NULL); + tcp_sent(pxtcp->pcb, NULL); + tcp_poll(pxtcp->pcb, NULL, 255); + tcp_err(pxtcp->pcb, NULL); + tcp_arg(pxtcp->pcb, NULL); + pxtcp->pcb = NULL; +} + + +/** + * Lwip thread callback invoked via pxtcp::msg_delete + * + * Since we use static messages to communicate to the lwip thread, we + * cannot delete pxtcp without making sure there are no unprocessed + * messages in the lwip thread mailbox. + * + * The easiest way to ensure that is to send this "delete" message as + * the last one and when it's processed we know there are no more and + * it's safe to delete pxtcp. + * + * Poll manager handlers should use pxtcp_schedule_delete() + * convenience function. + */ +static void +pxtcp_pcb_delete_pxtcp(void *ctx) +{ + struct pxtcp *pxtcp = (struct pxtcp *)ctx; + + DPRINTF(("%s: pxtcp %p, pcb %p, sock %d%s\n", + __func__, (void *)pxtcp, (void *)pxtcp->pcb, pxtcp->sock, + (pxtcp->deferred_delete && !pxtcp->inbound_pull + ? " (was deferred)" : ""))); + + LWIP_ASSERT1(pxtcp != NULL); + LWIP_ASSERT1(pxtcp->pmhdl.slot < 0); + LWIP_ASSERT1(pxtcp->outbound_close_done); + LWIP_ASSERT1(pxtcp->inbound_close); /* not necessarily done */ + + + /* + * pxtcp is no longer registered with poll manager, so it's safe + * to close the socket. + */ + if (pxtcp->sock != INVALID_SOCKET) { + closesocket(pxtcp->sock); + pxtcp->sock = INVALID_SOCKET; + } + + /* + * We might have already dissociated from a fully closed pcb, or + * guest might have sent us a reset while msg_delete was in + * transit. If there's no pcb, we are done. + */ + if (pxtcp->pcb == NULL) { + pollmgr_refptr_unref(pxtcp->rp); + pxtcp_free(pxtcp); + return; + } + + /* + * Have we completely forwarded all inbound traffic to the guest? + * + * We may still be waiting for ACKs. We may have failed to send + * some of the data (tcp_write() failed with ERR_MEM). We may + * have failed to send the FIN (tcp_shutdown() failed with + * ERR_MEM). + */ + if (pxtcp_pcb_forward_inbound_done(pxtcp)) { + pxtcp_pcb_dissociate(pxtcp); + pollmgr_refptr_unref(pxtcp->rp); + pxtcp_free(pxtcp); + } + else { + DPRINTF2(("delete: pxtcp %p; pcb %p:" + " unacked %d, unsent %d, vacant %d, %s - DEFER!\n", + (void *)pxtcp, (void *)pxtcp->pcb, + (int)pxtcp->inbuf.unacked, + (int)pxtcp->inbuf.unsent, + (int)pxtcp->inbuf.vacant, + pxtcp->inbound_close_done ? "FIN sent" : "FIN is NOT sent")); + + LWIP_ASSERT1(!pxtcp->deferred_delete); + pxtcp->deferred_delete = 1; + } +} + + +/** + * If we couldn't delete pxtcp right away in the msg_delete callback + * from the poll manager thread, we repeat the check at the end of + * relevant pcb callbacks. + */ +DECLINLINE(void) +pxtcp_pcb_maybe_deferred_delete(struct pxtcp *pxtcp) +{ + if (pxtcp->deferred_delete && pxtcp_pcb_forward_inbound_done(pxtcp)) { + pxtcp_pcb_delete_pxtcp(pxtcp); + } +} + + +/** + * Poll manager callbacks should use this convenience wrapper to + * schedule pxtcp deletion on the lwip thread and to deregister from + * the poll manager. + */ +static int +pxtcp_schedule_delete(struct pxtcp *pxtcp) +{ + /* + * If pollmgr_refptr_get() is called by any channel before + * scheduled deletion happens, let them know we are gone. + */ + pxtcp->pmhdl.slot = -1; + + /* + * Schedule deletion. Since poll manager thread may be pre-empted + * right after we send the message, the deletion may actually + * happen on the lwip thread before we return from this function, + * so it's not safe to refer to pxtcp after this call. + */ + proxy_lwip_post(&pxtcp->msg_delete); + + /* tell poll manager to deregister us */ + return -1; +} + + +/** + * Lwip thread callback invoked via pxtcp::msg_reset + * + * Like pxtcp_pcb_delete(), but sends RST to the guest before + * deleting this pxtcp. + */ +static void +pxtcp_pcb_reset_pxtcp(void *ctx) +{ + struct pxtcp *pxtcp = (struct pxtcp *)ctx; + LWIP_ASSERT1(pxtcp != NULL); + + DPRINTF0(("%s: pxtcp %p, pcb %p, sock %d\n", + __func__, (void *)pxtcp, (void *)pxtcp->pcb, pxtcp->sock)); + + if (pxtcp->sock != INVALID_SOCKET) { + proxy_reset_socket(pxtcp->sock); + pxtcp->sock = INVALID_SOCKET; + } + + if (pxtcp->pcb != NULL) { + struct tcp_pcb *pcb = pxtcp->pcb; + pxtcp_pcb_dissociate(pxtcp); + tcp_abort(pcb); + } + + pollmgr_refptr_unref(pxtcp->rp); + pxtcp_free(pxtcp); +} + + + +/** + * Poll manager callbacks should use this convenience wrapper to + * schedule pxtcp reset and deletion on the lwip thread and to + * deregister from the poll manager. + * + * See pxtcp_schedule_delete() for additional comments. + */ +static int +pxtcp_schedule_reset(struct pxtcp *pxtcp) +{ + pxtcp->pmhdl.slot = -1; + proxy_lwip_post(&pxtcp->msg_reset); + return -1; +} + + +/** + * Reject proxy connection attempt. Depending on the cause (sockerr) + * we may just drop the pcb silently, generate an ICMP datagram or + * send TCP reset. + */ +static void +pxtcp_pcb_reject(struct tcp_pcb *pcb, int sockerr, + struct netif *netif, struct pbuf *p) +{ + int reset = 0; + + if (sockerr == ECONNREFUSED) { + reset = 1; + } + else if (p != NULL) { + struct netif *oif; + + LWIP_ASSERT1(netif != NULL); + + oif = ip_current_netif(); + ip_current_netif() = netif; + + if (PCB_ISIPV6(pcb)) { + if (sockerr == EHOSTDOWN) { + icmp6_dest_unreach(p, ICMP6_DUR_ADDRESS); /* XXX: ??? */ + } + else if (sockerr == EHOSTUNREACH + || sockerr == ENETDOWN + || sockerr == ENETUNREACH) + { + icmp6_dest_unreach(p, ICMP6_DUR_NO_ROUTE); + } + } + else { + if (sockerr == EHOSTDOWN + || sockerr == EHOSTUNREACH + || sockerr == ENETDOWN + || sockerr == ENETUNREACH) + { + icmp_dest_unreach(p, ICMP_DUR_HOST); + } + } + + ip_current_netif() = oif; + } + + tcp_abandon(pcb, reset); +} + + +/** + * Called from poll manager thread via pxtcp::msg_accept when proxy + * failed to connect to the destination. Also called when we failed + * to register pxtcp with poll manager. + * + * This is like pxtcp_pcb_reset_pxtcp() but is more discriminate in + * how this unestablished connection is terminated. + */ +static void +pxtcp_pcb_accept_refuse(void *ctx) +{ + struct pxtcp *pxtcp = (struct pxtcp *)ctx; + + DPRINTF0(("%s: pxtcp %p, pcb %p, sock %d: %R[sockerr]\n", + __func__, (void *)pxtcp, (void *)pxtcp->pcb, + pxtcp->sock, pxtcp->sockerr)); + + LWIP_ASSERT1(pxtcp != NULL); + LWIP_ASSERT1(pxtcp->sock == INVALID_SOCKET); + + if (pxtcp->pcb != NULL) { + struct tcp_pcb *pcb = pxtcp->pcb; + pxtcp_pcb_dissociate(pxtcp); + pxtcp_pcb_reject(pcb, pxtcp->sockerr, pxtcp->netif, pxtcp->unsent); + } + + pollmgr_refptr_unref(pxtcp->rp); + pxtcp_free(pxtcp); +} + + +/** + * Convenience wrapper for poll manager connect callback to reject + * connection attempt. + * + * Like pxtcp_schedule_reset(), but the callback is more discriminate + * in how this unestablished connection is terminated. + */ +static int +pxtcp_schedule_reject(struct pxtcp *pxtcp) +{ + pxtcp->msg_accept.msg.cb.function = pxtcp_pcb_accept_refuse; + pxtcp->pmhdl.slot = -1; + proxy_lwip_post(&pxtcp->msg_accept); + return -1; +} + + +/** + * Global tcp_proxy_accept() callback for proxied outgoing TCP + * connections from guest(s). + */ +static err_t +pxtcp_pcb_heard(void *arg, struct tcp_pcb *newpcb, struct pbuf *syn) +{ + LWIP_UNUSED_ARG(arg); + + return pxtcp_pcb_accept_outbound(newpcb, syn, + PCB_ISIPV6(newpcb), &newpcb->local_ip, newpcb->local_port); +} + + +err_t +pxtcp_pcb_accept_outbound(struct tcp_pcb *newpcb, struct pbuf *p, + int is_ipv6, ipX_addr_t *dst_addr, u16_t dst_port) +{ + struct pxtcp *pxtcp; + ipX_addr_t mapped_dst_addr; + int sdom; + SOCKET sock; + ssize_t nsent; + int sockerr = 0; + + /* + * TCP first calls accept callback when it receives the first SYN + * and "tentatively accepts" new proxied connection attempt. When + * proxy "confirms" the SYN and sends SYN|ACK and the guest + * replies with ACK the accept callback is called again, this time + * with the established connection. + */ + LWIP_ASSERT1(newpcb->state == SYN_RCVD_0); + tcp_accept(newpcb, pxtcp_pcb_accept); + tcp_arg(newpcb, NULL); + + tcp_setprio(newpcb, TCP_PRIO_MAX); + + pxremap_outbound_ipX(is_ipv6, &mapped_dst_addr, dst_addr); + + sdom = is_ipv6 ? PF_INET6 : PF_INET; + sock = proxy_connected_socket(sdom, SOCK_STREAM, + &mapped_dst_addr, dst_port); + if (sock == INVALID_SOCKET) { + sockerr = SOCKERRNO(); + goto abort; + } + + pxtcp = pxtcp_allocate(); + if (pxtcp == NULL) { + proxy_reset_socket(sock); + goto abort; + } + + /* save initial datagram in case we need to reply with ICMP */ + if (p != NULL) { + pbuf_ref(p); + pxtcp->unsent = p; + pxtcp->netif = ip_current_netif(); + } + + pxtcp_pcb_associate(pxtcp, newpcb); + pxtcp->sock = sock; + + pxtcp->pmhdl.callback = pxtcp_pmgr_connect; + pxtcp->events = POLLOUT; + + nsent = pxtcp_chan_send(POLLMGR_CHAN_PXTCP_ADD, pxtcp); + if (nsent < 0) { + pxtcp->sock = INVALID_SOCKET; + proxy_reset_socket(sock); + pxtcp_pcb_accept_refuse(pxtcp); + return ERR_ABRT; + } + + return ERR_OK; + + abort: + DPRINTF0(("%s: pcb %p, sock %d: %R[sockerr]\n", + __func__, (void *)newpcb, sock, sockerr)); + pxtcp_pcb_reject(newpcb, sockerr, ip_current_netif(), p); + return ERR_ABRT; +} + + +/** + * tcp_proxy_accept() callback for accepted proxied outgoing TCP + * connections from guest(s). This is "real" accept with three-way + * handshake completed. + */ +static err_t +pxtcp_pcb_accept(void *arg, struct tcp_pcb *pcb, err_t error) +{ + struct pxtcp *pxtcp = (struct pxtcp *)arg; + + LWIP_UNUSED_ARG(pcb); /* used only in asserts */ + LWIP_UNUSED_ARG(error); /* always ERR_OK */ + + LWIP_ASSERT1(pxtcp != NULL); + LWIP_ASSERT1(pxtcp->pcb = pcb); + LWIP_ASSERT1(pcb->callback_arg == pxtcp); + + /* send any inbound data that are already queued */ + pxtcp_pcb_forward_inbound(pxtcp); + return ERR_OK; +} + + +/** + * Initial poll manager callback for proxied outgoing TCP connections. + * pxtcp_pcb_accept() sets pxtcp::pmhdl::callback to this. + * + * Waits for connect(2) to the destination to complete. On success + * replaces itself with pxtcp_pmgr_pump() callback common to all + * established TCP connections. + */ +static int +pxtcp_pmgr_connect(struct pollmgr_handler *handler, SOCKET fd, int revents) +{ + struct pxtcp *pxtcp; + RT_NOREF(fd); + + pxtcp = (struct pxtcp *)handler->data; + LWIP_ASSERT1(handler == &pxtcp->pmhdl); + LWIP_ASSERT1(fd == pxtcp->sock); + LWIP_ASSERT1(pxtcp->sockerr == 0); + + if (revents & POLLNVAL) { + pxtcp->sock = INVALID_SOCKET; + pxtcp->sockerr = ETIMEDOUT; + return pxtcp_schedule_reject(pxtcp); + } + + /* + * Solaris and NetBSD don't report either POLLERR or POLLHUP when + * connect(2) fails, just POLLOUT. In that case we always need to + * check SO_ERROR. + */ +#if defined(RT_OS_SOLARIS) || defined(RT_OS_NETBSD) +# define CONNECT_CHECK_ERROR POLLOUT +#else +# define CONNECT_CHECK_ERROR (POLLERR | POLLHUP) +#endif + + /* + * Check the cause of the failure so that pxtcp_pcb_reject() may + * behave accordingly. + */ + if (revents & CONNECT_CHECK_ERROR) { + socklen_t optlen = (socklen_t)sizeof(pxtcp->sockerr); + int status; + SOCKET s; + + status = getsockopt(pxtcp->sock, SOL_SOCKET, SO_ERROR, + (char *)&pxtcp->sockerr, &optlen); + if (RT_UNLIKELY(status == SOCKET_ERROR)) { /* should not happen */ + DPRINTF(("%s: sock %d: SO_ERROR failed: %R[sockerr]\n", + __func__, fd, SOCKERRNO())); + pxtcp->sockerr = ETIMEDOUT; + } + else { + /* don't spam this log on successful connect(2) */ + if ((revents & (POLLERR | POLLHUP)) /* we were told it's failed */ + || pxtcp->sockerr != 0) /* we determined it's failed */ + { + DPRINTF(("%s: sock %d: connect: %R[sockerr]\n", + __func__, fd, pxtcp->sockerr)); + } + + if ((revents & (POLLERR | POLLHUP)) + && RT_UNLIKELY(pxtcp->sockerr == 0)) + { + /* if we're told it's failed, make sure it's marked as such */ + pxtcp->sockerr = ETIMEDOUT; + } + } + + if (pxtcp->sockerr != 0) { + s = pxtcp->sock; + pxtcp->sock = INVALID_SOCKET; + closesocket(s); + return pxtcp_schedule_reject(pxtcp); + } + } + + if (revents & POLLOUT) { /* connect is successful */ + /* confirm accept to the guest */ + proxy_lwip_post(&pxtcp->msg_accept); + + /* + * Switch to common callback used for all established proxied + * connections. + */ + pxtcp->pmhdl.callback = pxtcp_pmgr_pump; + + /* + * Initially we poll for incoming traffic only. Outgoing + * traffic is fast-forwarded by pxtcp_pcb_recv(); if it fails + * it will ask us to poll for POLLOUT too. + */ + pxtcp->events = POLLIN; + return pxtcp->events; + } + + /* should never get here */ + DPRINTF0(("%s: pxtcp %p, sock %d: unexpected revents 0x%x\n", + __func__, (void *)pxtcp, fd, revents)); + return pxtcp_schedule_reset(pxtcp); +} + + +/** + * Called from poll manager thread via pxtcp::msg_accept when proxy + * connected to the destination. Finalize accept by sending SYN|ACK + * to the guest. + */ +static void +pxtcp_pcb_accept_confirm(void *ctx) +{ + struct pxtcp *pxtcp = (struct pxtcp *)ctx; + err_t error; + + LWIP_ASSERT1(pxtcp != NULL); + if (pxtcp->pcb == NULL) { + return; + } + + /* we are not going to reply with ICMP, so we can drop initial pbuf */ + if (pxtcp->unsent != NULL) { + pbuf_free(pxtcp->unsent); + pxtcp->unsent = NULL; + } + + error = tcp_proxy_accept_confirm(pxtcp->pcb); + + /* + * If lwIP failed to enqueue SYN|ACK because it's out of pbufs it + * abandons the pcb. Retrying that is not very easy, since it + * would require keeping "fractional state". From guest's point + * of view there is no reply to its SYN so it will either resend + * the SYN (effetively triggering full connection retry for us), + * or it will eventually time out. + */ + if (error == ERR_ABRT) { + pxtcp->pcb = NULL; /* pcb is gone */ + pxtcp_chan_send_weak(POLLMGR_CHAN_PXTCP_RESET, pxtcp); + } + + /* + * else if (error != ERR_OK): even if tcp_output() failed with + * ERR_MEM - don't give up, that SYN|ACK is enqueued and will be + * retransmitted eventually. + */ +} + + +/** + * Entry point for port-forwarding. + * + * fwtcp accepts new incoming connection, creates pxtcp for the socket + * (with no pcb yet) and adds it to the poll manager (polling for + * errors only). Then it calls this function to construct the pcb and + * perform connection to the guest. + */ +void +pxtcp_pcb_connect(struct pxtcp *pxtcp, const struct fwspec *fwspec) +{ + struct sockaddr_storage ss; + socklen_t sslen; + struct tcp_pcb *pcb; + ipX_addr_t src_addr, dst_addr; + u16_t src_port, dst_port; + int status; + err_t error; + + LWIP_ASSERT1(pxtcp != NULL); + LWIP_ASSERT1(pxtcp->pcb == NULL); + LWIP_ASSERT1(fwspec->stype == SOCK_STREAM); + + pcb = tcp_new(); + if (pcb == NULL) { + goto reset; + } + + tcp_setprio(pcb, TCP_PRIO_MAX); + pxtcp_pcb_associate(pxtcp, pcb); + + sslen = sizeof(ss); + status = getpeername(pxtcp->sock, (struct sockaddr *)&ss, &sslen); + if (status == SOCKET_ERROR) { + goto reset; + } + + /* nit: compares PF and AF, but they are the same everywhere */ + LWIP_ASSERT1(ss.ss_family == fwspec->sdom); + + status = fwany_ipX_addr_set_src(&src_addr, (const struct sockaddr *)&ss); + if (status == PXREMAP_FAILED) { + goto reset; + } + + if (ss.ss_family == PF_INET) { + const struct sockaddr_in *peer4 = (const struct sockaddr_in *)&ss; + + src_port = peer4->sin_port; + + memcpy(&dst_addr.ip4, &fwspec->dst.sin.sin_addr, sizeof(ip_addr_t)); + dst_port = fwspec->dst.sin.sin_port; + } + else { /* PF_INET6 */ + const struct sockaddr_in6 *peer6 = (const struct sockaddr_in6 *)&ss; + ip_set_v6(pcb, 1); + + src_port = peer6->sin6_port; + + memcpy(&dst_addr.ip6, &fwspec->dst.sin6.sin6_addr, sizeof(ip6_addr_t)); + dst_port = fwspec->dst.sin6.sin6_port; + } + + /* lwip port arguments are in host order */ + src_port = ntohs(src_port); + dst_port = ntohs(dst_port); + + error = tcp_proxy_bind(pcb, ipX_2_ip(&src_addr), src_port); + if (error != ERR_OK) { + goto reset; + } + + error = tcp_connect(pcb, ipX_2_ip(&dst_addr), dst_port, + /* callback: */ pxtcp_pcb_connected); + if (error != ERR_OK) { + goto reset; + } + + return; + + reset: + pxtcp_chan_send_weak(POLLMGR_CHAN_PXTCP_RESET, pxtcp); +} + + +/** + * Port-forwarded connection to guest is successful, pump data. + */ +static err_t +pxtcp_pcb_connected(void *arg, struct tcp_pcb *pcb, err_t error) +{ + struct pxtcp *pxtcp = (struct pxtcp *)arg; + + LWIP_ASSERT1(error == ERR_OK); /* always called with ERR_OK */ + LWIP_UNUSED_ARG(error); + + LWIP_ASSERT1(pxtcp != NULL); + LWIP_ASSERT1(pxtcp->pcb == pcb); + LWIP_ASSERT1(pcb->callback_arg == pxtcp); + LWIP_UNUSED_ARG(pcb); + + DPRINTF0(("%s: new pxtcp %p; pcb %p; sock %d\n", + __func__, (void *)pxtcp, (void *)pxtcp->pcb, pxtcp->sock)); + + /* ACK on connection is like ACK on data in pxtcp_pcb_sent() */ + pxtcp_chan_send_weak(POLLMGR_CHAN_PXTCP_POLLIN, pxtcp); + + return ERR_OK; +} + + +/** + * tcp_recv() callback. + */ +static err_t +pxtcp_pcb_recv(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t error) +{ + struct pxtcp *pxtcp = (struct pxtcp *)arg; + + LWIP_ASSERT1(error == ERR_OK); /* always called with ERR_OK */ + LWIP_UNUSED_ARG(error); + + LWIP_ASSERT1(pxtcp != NULL); + LWIP_ASSERT1(pxtcp->pcb == pcb); + LWIP_ASSERT1(pcb->callback_arg == pxtcp); + LWIP_UNUSED_ARG(pcb); + + + /* + * Have we done sending previous batch? + */ + if (pxtcp->unsent != NULL) { + if (p != NULL) { + /* + * Return an error to tell TCP to hold onto that pbuf. + * It will be presented to us later from tcp_fasttmr(). + */ + return ERR_WOULDBLOCK; + } + else { + /* + * Unlike data, p == NULL indicating orderly shutdown is + * NOT presented to us again + */ + pxtcp->outbound_close = 1; + return ERR_OK; + } + } + + + /* + * Guest closed? + */ + if (p == NULL) { + pxtcp->outbound_close = 1; + pxtcp_pcb_forward_outbound_close(pxtcp); + return ERR_OK; + } + + + /* + * Got data, send what we can without blocking. + */ + return pxtcp_pcb_forward_outbound(pxtcp, p); +} + + +/** + * Guest half-closed its TX side of the connection. + * + * Called either immediately from pxtcp_pcb_recv() when it gets NULL, + * or from pxtcp_pcb_forward_outbound() when it finishes forwarding + * previously unsent data and sees pxtcp::outbound_close flag saved by + * pxtcp_pcb_recv(). + */ +static void +pxtcp_pcb_forward_outbound_close(struct pxtcp *pxtcp) +{ + struct tcp_pcb *pcb; + + LWIP_ASSERT1(pxtcp != NULL); + LWIP_ASSERT1(pxtcp->outbound_close); + LWIP_ASSERT1(!pxtcp->outbound_close_done); + + pcb = pxtcp->pcb; + LWIP_ASSERT1(pcb != NULL); + + DPRINTF(("outbound_close: pxtcp %p; pcb %p %s\n", + (void *)pxtcp, (void *)pcb, tcp_debug_state_str(pcb->state))); + + + /* set the flag first, since shutdown() may trigger POLLHUP */ + pxtcp->outbound_close_done = 1; + shutdown(pxtcp->sock, SHUT_WR); /* half-close the socket */ + +#if !(HAVE_TCP_POLLHUP & POLLOUT) + /* + * We need to nudge poll manager manually, since OS will not + * report POLLHUP. + */ + if (pxtcp->inbound_close) { + pxtcp_chan_send_weak(POLLMGR_CHAN_PXTCP_DEL, pxtcp); + } +#endif + + + /* no more outbound data coming to us */ + tcp_recv(pcb, NULL); + + /* + * If we have already done inbound close previously (active close + * on the pcb), then we must not hold onto a pcb in TIME_WAIT + * state since those will be recycled by lwip when it runs out of + * free pcbs in the pool. + * + * The test is true also for a pcb in CLOSING state that waits + * just for the ACK of its FIN (to transition to TIME_WAIT). + */ + if (pxtcp_pcb_forward_inbound_done(pxtcp)) { + pxtcp_pcb_dissociate(pxtcp); + } +} + + +/** + * Forward outbound data from pcb to socket. + * + * Called by pxtcp_pcb_recv() to forward new data and by callout + * triggered by POLLOUT on the socket to send previously unsent data. + * + * (Re)scehdules one-time callout if not all data are sent. + */ +static err_t +pxtcp_pcb_forward_outbound(struct pxtcp *pxtcp, struct pbuf *p) +{ + struct pbuf *qs, *q; + size_t qoff; + size_t forwarded; + int sockerr; + + LWIP_ASSERT1(pxtcp->unsent == NULL || pxtcp->unsent == p); + + forwarded = 0; + sockerr = 0; + + q = NULL; + qoff = 0; + + qs = p; + while (qs != NULL) { + IOVEC iov[8]; + const size_t iovsize = sizeof(iov)/sizeof(iov[0]); + size_t fwd1; + ssize_t nsent; + size_t i; + + fwd1 = 0; + for (i = 0, q = qs; i < iovsize && q != NULL; ++i, q = q->next) { + LWIP_ASSERT1(q->len > 0); + IOVEC_SET_BASE(iov[i], q->payload); + IOVEC_SET_LEN(iov[i], q->len); + fwd1 += q->len; + } + + /* + * TODO: This is where application-level proxy can hook into + * to process outbound traffic. + */ + nsent = pxtcp_sock_send(pxtcp, iov, i); + + if (nsent == (ssize_t)fwd1) { + /* successfully sent this chain fragment completely */ + forwarded += nsent; + qs = q; + } + else if (nsent >= 0) { + /* successfully sent only some data */ + forwarded += nsent; + + /* find the first pbuf that was not completely forwarded */ + qoff = nsent; + for (i = 0, q = qs; i < iovsize && q != NULL; ++i, q = q->next) { + if (qoff < q->len) { + break; + } + qoff -= q->len; + } + LWIP_ASSERT1(q != NULL); + LWIP_ASSERT1(qoff < q->len); + break; + } + else { + sockerr = -nsent; + + /* + * Some errors are really not errors - if we get them, + * it's not different from getting nsent == 0, so filter + * them out here. + */ + if (proxy_error_is_transient(sockerr)) { + sockerr = 0; + } + q = qs; + qoff = 0; + break; + } + } + + if (forwarded > 0) { + DPRINTF2(("forward_outbound: pxtcp %p, pcb %p: sent %d bytes\n", + (void *)pxtcp, (void *)pxtcp->pcb, (int)forwarded)); + tcp_recved(pxtcp->pcb, (u16_t)forwarded); + } + + if (q == NULL) { /* everything is forwarded? */ + LWIP_ASSERT1(sockerr == 0); + LWIP_ASSERT1(forwarded == p->tot_len); + + pxtcp->unsent = NULL; + pbuf_free(p); + if (pxtcp->outbound_close) { + pxtcp_pcb_forward_outbound_close(pxtcp); + } + } + else { + if (q != p) { + /* free forwarded pbufs at the beginning of the chain */ + pbuf_ref(q); + pbuf_free(p); + } + if (qoff > 0) { + /* advance payload pointer past the forwarded part */ + pbuf_header(q, -(s16_t)qoff); + } + pxtcp->unsent = q; + DPRINTF2(("forward_outbound: pxtcp %p, pcb %p: kept %d bytes\n", + (void *)pxtcp, (void *)pxtcp->pcb, (int)q->tot_len)); + + /* + * Have sendmsg() failed? + * + * Connection reset will be detected by poll and + * pxtcp_schedule_reset() will be called. + * + * Otherwise something *really* unexpected must have happened, + * so we'd better abort. + */ + if (sockerr != 0 && sockerr != ECONNRESET) { + struct tcp_pcb *pcb = pxtcp->pcb; + DPRINTF2(("forward_outbound: pxtcp %p, pcb %p: %R[sockerr]\n", + (void *)pxtcp, (void *)pcb, sockerr)); + + pxtcp_pcb_dissociate(pxtcp); + + tcp_abort(pcb); + + /* call error callback manually since we've already dissociated */ + pxtcp_pcb_err((void *)pxtcp, ERR_ABRT); + return ERR_ABRT; + } + + /* schedule one-shot POLLOUT on the socket */ + pxtcp_chan_send_weak(POLLMGR_CHAN_PXTCP_POLLOUT, pxtcp); + } + return ERR_OK; +} + + +#if !defined(RT_OS_WINDOWS) +static ssize_t +pxtcp_sock_send(struct pxtcp *pxtcp, IOVEC *iov, size_t iovlen) +{ + struct msghdr mh; + ssize_t nsent; + +#ifdef MSG_NOSIGNAL + const int send_flags = MSG_NOSIGNAL; +#else + const int send_flags = 0; +#endif + + memset(&mh, 0, sizeof(mh)); + + mh.msg_iov = iov; + mh.msg_iovlen = iovlen; + + nsent = sendmsg(pxtcp->sock, &mh, send_flags); + if (nsent < 0) { + nsent = -SOCKERRNO(); + } + + return nsent; +} +#else /* RT_OS_WINDOWS */ +static ssize_t +pxtcp_sock_send(struct pxtcp *pxtcp, IOVEC *iov, size_t iovlen) +{ + DWORD nsent; + int status; + + status = WSASend(pxtcp->sock, iov, (DWORD)iovlen, &nsent, + 0, NULL, NULL); + if (status == SOCKET_ERROR) { + return -SOCKERRNO(); + } + + return nsent; +} +#endif /* RT_OS_WINDOWS */ + + +/** + * Callback from poll manager (on POLLOUT) to send data from + * pxtcp::unsent pbuf to socket. + */ +static void +pxtcp_pcb_write_outbound(void *ctx) +{ + struct pxtcp *pxtcp = (struct pxtcp *)ctx; + LWIP_ASSERT1(pxtcp != NULL); + + if (pxtcp->pcb == NULL) { + return; + } + + pxtcp_pcb_forward_outbound(pxtcp, pxtcp->unsent); +} + + +/** + * Common poll manager callback used by both outgoing and incoming + * (port-forwarded) connections that has connected socket. + */ +static int +pxtcp_pmgr_pump(struct pollmgr_handler *handler, SOCKET fd, int revents) +{ + struct pxtcp *pxtcp; + int status; + int sockerr; + RT_NOREF(fd); + + pxtcp = (struct pxtcp *)handler->data; + LWIP_ASSERT1(handler == &pxtcp->pmhdl); + LWIP_ASSERT1(fd == pxtcp->sock); + + if (revents & POLLNVAL) { + pxtcp->sock = INVALID_SOCKET; + return pxtcp_schedule_reset(pxtcp); + } + + if (revents & POLLERR) { + socklen_t optlen = (socklen_t)sizeof(sockerr); + + status = getsockopt(pxtcp->sock, SOL_SOCKET, SO_ERROR, + (char *)&sockerr, &optlen); + if (status == SOCKET_ERROR) { /* should not happen */ + DPRINTF(("sock %d: POLLERR: SO_ERROR failed: %R[sockerr]\n", + fd, SOCKERRNO())); + } + else { + DPRINTF0(("sock %d: POLLERR: %R[sockerr]\n", fd, sockerr)); + } + return pxtcp_schedule_reset(pxtcp); + } + + if (revents & POLLOUT) { + pxtcp->events &= ~POLLOUT; + proxy_lwip_post(&pxtcp->msg_outbound); + } + + if (revents & POLLIN) { + ssize_t nread; + int stop_pollin; + + nread = pxtcp_sock_read(pxtcp, &stop_pollin); + if (nread < 0) { + sockerr = -(int)nread; + DPRINTF0(("sock %d: POLLIN: %R[sockerr]\n", fd, sockerr)); + return pxtcp_schedule_reset(pxtcp); + } + + if (stop_pollin) { + pxtcp->events &= ~POLLIN; + } + + if (nread > 0) { + proxy_lwip_post(&pxtcp->msg_inbound); +#if !HAVE_TCP_POLLHUP + /* + * If host does not report POLLHUP for closed sockets + * (e.g. NetBSD) we should check for full close manually. + */ + if (pxtcp->inbound_close && pxtcp->outbound_close_done) { + LWIP_ASSERT1((revents & POLLHUP) == 0); + return pxtcp_schedule_delete(pxtcp); + } +#endif + } + } + +#if !HAVE_TCP_POLLHUP + LWIP_ASSERT1((revents & POLLHUP) == 0); +#else + if (revents & POLLHUP) { + DPRINTF(("sock %d: HUP\n", fd)); + +#if HAVE_TCP_POLLHUP == POLLIN + /* + * XXX: OSX reports POLLHUP once more when inbound is already + * half-closed (which has already been reported as a "normal" + * POLLHUP, handled below), the socket is polled for POLLOUT + * (guest sends a lot of data that we can't push out fast + * enough), and remote sends a reset - e.g. an http client + * that half-closes after request and then aborts the transfer. + * + * It really should have been reported as POLLERR, but it + * seems OSX never reports POLLERR for sockets. + */ +#if defined(RT_OS_DARWIN) + { + socklen_t optlen = (socklen_t)sizeof(sockerr); + + status = getsockopt(pxtcp->sock, SOL_SOCKET, SO_ERROR, + (char *)&sockerr, &optlen); + if (status == SOCKET_ERROR) { /* should not happen */ + DPRINTF(("sock %d: POLLHUP: SO_ERROR failed: %R[sockerr]\n", + fd, SOCKERRNO())); + sockerr = ECONNRESET; + } + else if (sockerr != 0) { + DPRINTF0(("sock %d: POLLHUP: %R[sockerr]\n", fd, sockerr)); + } + + if (sockerr != 0) { /* XXX: should have been POLLERR */ + return pxtcp_schedule_reset(pxtcp); + } + } +#endif /* RT_OS_DARWIN */ + + /* + * Remote closed inbound. + */ + if (!pxtcp->outbound_close_done) { + /* + * We might still need to poll for POLLOUT, but we can not + * poll for POLLIN anymore (even if not all data are read) + * because we will be spammed by POLLHUP. + */ + pxtcp->events &= ~POLLIN; + if (!pxtcp->inbound_close) { + /* the rest of the input has to be pulled */ + proxy_lwip_post(&pxtcp->msg_inpull); + } + } + else +#endif + /* + * Both directions are closed. + */ + { + LWIP_ASSERT1(pxtcp->outbound_close_done); + + if (pxtcp->inbound_close) { + /* there's no unread data, we are done */ + return pxtcp_schedule_delete(pxtcp); + } + else { + /* pull the rest of the input first (deferred_delete) */ + pxtcp->pmhdl.slot = -1; + proxy_lwip_post(&pxtcp->msg_inpull); + return -1; + } + /* NOTREACHED */ + } + + } +#endif /* HAVE_TCP_POLLHUP */ + + return pxtcp->events; +} + + +/** + * Read data from socket to ringbuf. This may be used both on lwip + * and poll manager threads. + * + * Flag pointed to by pstop is set when further reading is impossible, + * either temporary when buffer is full, or permanently when EOF is + * received. + * + * Returns number of bytes read. NB: EOF is reported as 1! + * + * Returns zero if nothing was read, either because buffer is full, or + * if no data is available (EWOULDBLOCK, EINTR &c). + * + * Returns -errno on real socket errors. + */ +static ssize_t +pxtcp_sock_read(struct pxtcp *pxtcp, int *pstop) +{ + IOVEC iov[2]; + size_t iovlen; + ssize_t nread; + + const size_t sz = pxtcp->inbuf.bufsize; + size_t beg, lim, wrnew; + + *pstop = 0; + + beg = pxtcp->inbuf.vacant; + IOVEC_SET_BASE(iov[0], &pxtcp->inbuf.buf[beg]); + + /* lim is the index we can NOT write to */ + lim = pxtcp->inbuf.unacked; + if (lim == 0) { + lim = sz - 1; /* empty slot at the end */ + } + else if (lim == 1 && beg != 0) { + lim = sz; /* empty slot at the beginning */ + } + else { + --lim; + } + + if (beg == lim) { + /* + * Buffer is full, stop polling for POLLIN. + * + * pxtcp_pcb_sent() will re-enable POLLIN when guest ACKs + * data, freeing space in the ring buffer. + */ + *pstop = 1; + return 0; + } + + if (beg < lim) { + /* free space in one chunk */ + iovlen = 1; + IOVEC_SET_LEN(iov[0], lim - beg); + } + else { + /* free space in two chunks */ + iovlen = 2; + IOVEC_SET_LEN(iov[0], sz - beg); + IOVEC_SET_BASE(iov[1], &pxtcp->inbuf.buf[0]); + IOVEC_SET_LEN(iov[1], lim); + } + + /* + * TODO: This is where application-level proxy can hook into to + * process inbound traffic. + */ + nread = pxtcp_sock_recv(pxtcp, iov, iovlen); + + if (nread > 0) { + wrnew = beg + nread; + if (wrnew >= sz) { + wrnew -= sz; + } + pxtcp->inbuf.vacant = wrnew; + DPRINTF2(("pxtcp %p: sock %d read %d bytes\n", + (void *)pxtcp, pxtcp->sock, (int)nread)); + return nread; + } + else if (nread == 0) { + *pstop = 1; + pxtcp->inbound_close = 1; + DPRINTF2(("pxtcp %p: sock %d read EOF\n", + (void *)pxtcp, pxtcp->sock)); + return 1; + } + else { + int sockerr = -nread; + + if (proxy_error_is_transient(sockerr)) { + /* haven't read anything, just return */ + DPRINTF2(("pxtcp %p: sock %d read cancelled\n", + (void *)pxtcp, pxtcp->sock)); + return 0; + } + else { + /* socket error! */ + DPRINTF0(("pxtcp %p: sock %d read: %R[sockerr]\n", + (void *)pxtcp, pxtcp->sock, sockerr)); + return -sockerr; + } + } +} + + +#if !defined(RT_OS_WINDOWS) +static ssize_t +pxtcp_sock_recv(struct pxtcp *pxtcp, IOVEC *iov, size_t iovlen) +{ + struct msghdr mh; + ssize_t nread; + + memset(&mh, 0, sizeof(mh)); + + mh.msg_iov = iov; + mh.msg_iovlen = iovlen; + + nread = recvmsg(pxtcp->sock, &mh, 0); + if (nread < 0) { + nread = -SOCKERRNO(); + } + + return nread; +} +#else /* RT_OS_WINDOWS */ +static ssize_t +pxtcp_sock_recv(struct pxtcp *pxtcp, IOVEC *iov, size_t iovlen) +{ + DWORD flags; + DWORD nread; + int status; + + flags = 0; + status = WSARecv(pxtcp->sock, iov, (DWORD)iovlen, &nread, + &flags, NULL, NULL); + if (status == SOCKET_ERROR) { + return -SOCKERRNO(); + } + + return (ssize_t)nread; +} +#endif /* RT_OS_WINDOWS */ + + +/** + * Callback from poll manager (pxtcp::msg_inbound) to trigger output + * from ringbuf to guest. + */ +static void +pxtcp_pcb_write_inbound(void *ctx) +{ + struct pxtcp *pxtcp = (struct pxtcp *)ctx; + LWIP_ASSERT1(pxtcp != NULL); + + if (pxtcp->pcb == NULL) { + return; + } + + pxtcp_pcb_forward_inbound(pxtcp); +} + + +/** + * tcp_poll() callback + * + * We swtich it on when tcp_write() or tcp_shutdown() fail with + * ERR_MEM to prevent connection from stalling. If there are ACKs or + * more inbound data then pxtcp_pcb_forward_inbound() will be + * triggered again, but if neither happens, tcp_poll() comes to the + * rescue. + */ +static err_t +pxtcp_pcb_poll(void *arg, struct tcp_pcb *pcb) +{ + struct pxtcp *pxtcp = (struct pxtcp *)arg; + LWIP_UNUSED_ARG(pcb); + + DPRINTF2(("%s: pxtcp %p; pcb %p\n", + __func__, (void *)pxtcp, (void *)pxtcp->pcb)); + + pxtcp_pcb_forward_inbound(pxtcp); + + /* + * If the last thing holding up deletion of the pxtcp was failed + * tcp_shutdown() and it succeeded, we may be the last callback. + */ + pxtcp_pcb_maybe_deferred_delete(pxtcp); + + return ERR_OK; +} + + +static void +pxtcp_pcb_schedule_poll(struct pxtcp *pxtcp) +{ + tcp_poll(pxtcp->pcb, pxtcp_pcb_poll, 0); +} + + +static void +pxtcp_pcb_cancel_poll(struct pxtcp *pxtcp) +{ + tcp_poll(pxtcp->pcb, NULL, 255); +} + + +/** + * Forward inbound data from ring buffer to the guest. + * + * Scheduled by poll manager thread after it receives more data into + * the ring buffer (we have more data to send). + + * Also called from tcp_sent() callback when guest ACKs some data, + * increasing pcb->snd_buf (we are permitted to send more data). + * + * Also called from tcp_poll() callback if previous attempt to forward + * inbound data failed with ERR_MEM (we need to try again). + */ +static void +pxtcp_pcb_forward_inbound(struct pxtcp *pxtcp) +{ + struct tcp_pcb *pcb; + size_t sndbuf; + size_t beg, lim, sndlim; + size_t toeob, tolim; + size_t nsent; + err_t error; + + LWIP_ASSERT1(pxtcp != NULL); + pcb = pxtcp->pcb; + if (pcb == NULL) { + return; + } + + if (/* __predict_false */ pcb->state < ESTABLISHED) { + /* + * If we have just confirmed accept of this connection, the + * pcb is in SYN_RCVD state and we still haven't received the + * ACK of our SYN. It's only in SYN_RCVD -> ESTABLISHED + * transition that lwip decrements pcb->acked so that that ACK + * is not reported to pxtcp_pcb_sent(). If we send something + * now and immediately close (think "daytime", e.g.) while + * still in SYN_RCVD state, we will move directly to + * FIN_WAIT_1 and when our confirming SYN is ACK'ed lwip will + * report it to pxtcp_pcb_sent(). + */ + DPRINTF2(("forward_inbound: pxtcp %p; pcb %p %s - later...\n", + (void *)pxtcp, (void *)pcb, tcp_debug_state_str(pcb->state))); + return; + } + + + beg = pxtcp->inbuf.unsent; /* private to lwip thread */ + lim = pxtcp->inbuf.vacant; + + if (beg == lim) { + if (pxtcp->inbound_close && !pxtcp->inbound_close_done) { + pxtcp_pcb_forward_inbound_close(pxtcp); + tcp_output(pcb); + return; + } + + /* + * Else, there's no data to send. + * + * If there is free space in the buffer, producer will + * reschedule us as it receives more data and vacant (lim) + * advances. + * + * If buffer is full when all data have been passed to + * tcp_write() but not yet acknowledged, we will advance + * unacked on ACK, freeing some space for producer to write to + * (then see above). + */ + return; + } + + sndbuf = tcp_sndbuf(pcb); + if (sndbuf == 0) { + /* + * Can't send anything now. As guest ACKs some data, TCP will + * call pxtcp_pcb_sent() callback and we will come here again. + */ + return; + } + + nsent = 0; + + /* + * We have three limits to consider: + * - how much data we have in the ringbuf + * - how much data we are allowed to send + * - ringbuf size + */ + toeob = pxtcp->inbuf.bufsize - beg; + if (lim < beg) { /* lim wrapped */ + if (sndbuf < toeob) { /* but we are limited by sndbuf */ + /* so beg is not going to wrap, treat sndbuf as lim */ + lim = beg + sndbuf; /* ... and proceed to the simple case */ + } + else { /* we are limited by the end of the buffer, beg will wrap */ + u8_t maybemore; + if (toeob == sndbuf || lim == 0) { + maybemore = 0; + } + else { + maybemore = TCP_WRITE_FLAG_MORE; + } + + Assert(toeob == (u16_t)toeob); + error = tcp_write(pcb, &pxtcp->inbuf.buf[beg], (u16_t)toeob, maybemore); + if (error != ERR_OK) { + goto writeerr; + } + nsent += toeob; + pxtcp->inbuf.unsent = 0; /* wrap */ + + if (maybemore) { + beg = 0; + sndbuf -= toeob; + } + else { + /* we are done sending, but ... */ + goto check_inbound_close; + } + } + } + + LWIP_ASSERT1(beg < lim); + sndlim = beg + sndbuf; + if (lim > sndlim) { + lim = sndlim; + } + tolim = lim - beg; + if (tolim > 0) { + error = tcp_write(pcb, &pxtcp->inbuf.buf[beg], (u16_t)tolim, 0); + if (error != ERR_OK) { + goto writeerr; + } + nsent += tolim; + pxtcp->inbuf.unsent = lim; + } + + check_inbound_close: + if (pxtcp->inbound_close && pxtcp->inbuf.unsent == pxtcp->inbuf.vacant) { + pxtcp_pcb_forward_inbound_close(pxtcp); + } + + DPRINTF2(("forward_inbound: pxtcp %p, pcb %p: sent %d bytes\n", + (void *)pxtcp, (void *)pcb, (int)nsent)); + tcp_output(pcb); + pxtcp_pcb_cancel_poll(pxtcp); + return; + + writeerr: + if (error == ERR_MEM) { + if (nsent > 0) { /* first write succeeded, second failed */ + DPRINTF2(("forward_inbound: pxtcp %p, pcb %p: sent %d bytes only\n", + (void *)pxtcp, (void *)pcb, (int)nsent)); + tcp_output(pcb); + } + DPRINTF(("forward_inbound: pxtcp %p, pcb %p: ERR_MEM\n", + (void *)pxtcp, (void *)pcb)); + pxtcp_pcb_schedule_poll(pxtcp); + } + else { + DPRINTF(("forward_inbound: pxtcp %p, pcb %p: %s\n", + (void *)pxtcp, (void *)pcb, proxy_lwip_strerr(error))); + + /* XXX: We shouldn't get ERR_ARG. Check ERR_CONN conditions early? */ + LWIP_ASSERT1(error == ERR_MEM); + } +} + + +static void +pxtcp_pcb_forward_inbound_close(struct pxtcp *pxtcp) +{ + struct tcp_pcb *pcb; + err_t error; + + LWIP_ASSERT1(pxtcp != NULL); + LWIP_ASSERT1(pxtcp->inbound_close); + LWIP_ASSERT1(!pxtcp->inbound_close_done); + LWIP_ASSERT1(pxtcp->inbuf.unsent == pxtcp->inbuf.vacant); + + pcb = pxtcp->pcb; + LWIP_ASSERT1(pcb != NULL); + + DPRINTF(("inbound_close: pxtcp %p; pcb %p: %s\n", + (void *)pxtcp, (void *)pcb, tcp_debug_state_str(pcb->state))); + + error = tcp_shutdown(pcb, /*RX*/ 0, /*TX*/ 1); + if (error != ERR_OK) { + DPRINTF(("inbound_close: pxtcp %p; pcb %p:" + " tcp_shutdown: error=%s\n", + (void *)pxtcp, (void *)pcb, proxy_lwip_strerr(error))); + pxtcp_pcb_schedule_poll(pxtcp); + return; + } + + pxtcp_pcb_cancel_poll(pxtcp); + pxtcp->inbound_close_done = 1; + + + /* + * If we have already done outbound close previously (passive + * close on the pcb), then we must not hold onto a pcb in LAST_ACK + * state since those will be deleted by lwip when that last ack + * comes from the guest. + * + * NB: We do NOT check for deferred delete here, even though we + * have just set one of its conditions, inbound_close_done. We + * let pcb callbacks that called us do that. It's simpler and + * cleaner that way. + */ + if (pxtcp->outbound_close_done && pxtcp_pcb_forward_inbound_done(pxtcp)) { + pxtcp_pcb_dissociate(pxtcp); + } +} + + +/** + * Check that all forwarded inbound data is sent and acked, and that + * inbound close is scheduled (we aren't called back when it's acked). + */ +DECLINLINE(int) +pxtcp_pcb_forward_inbound_done(const struct pxtcp *pxtcp) +{ + return (pxtcp->inbound_close_done /* also implies that all data forwarded */ + && pxtcp->inbuf.unacked == pxtcp->inbuf.unsent); +} + + +/** + * tcp_sent() callback - guest acknowledged len bytes. + * + * We can advance inbuf::unacked index, making more free space in the + * ringbuf and wake up producer on poll manager thread. + * + * We can also try to send more data if we have any since pcb->snd_buf + * was increased and we are now permitted to send more. + */ +static err_t +pxtcp_pcb_sent(void *arg, struct tcp_pcb *pcb, u16_t len) +{ + struct pxtcp *pxtcp = (struct pxtcp *)arg; + size_t unacked; + + LWIP_ASSERT1(pxtcp != NULL); + LWIP_ASSERT1(pxtcp->pcb == pcb); + LWIP_ASSERT1(pcb->callback_arg == pxtcp); + LWIP_UNUSED_ARG(pcb); /* only in assert */ + + DPRINTF2(("%s: pxtcp %p; pcb %p: +%d ACKed:" + " unacked %d, unsent %d, vacant %d\n", + __func__, (void *)pxtcp, (void *)pcb, (int)len, + (int)pxtcp->inbuf.unacked, + (int)pxtcp->inbuf.unsent, + (int)pxtcp->inbuf.vacant)); + + if (/* __predict_false */ len == 0) { + /* we are notified to start pulling */ + LWIP_ASSERT1(!pxtcp->inbound_close); + LWIP_ASSERT1(pxtcp->inbound_pull); + + unacked = pxtcp->inbuf.unacked; + } + else { + /* + * Advance unacked index. Guest acknowledged the data, so it + * won't be needed again for potential retransmits. + */ + unacked = pxtcp->inbuf.unacked + len; + if (unacked > pxtcp->inbuf.bufsize) { + unacked -= pxtcp->inbuf.bufsize; + } + pxtcp->inbuf.unacked = unacked; + } + + /* arrange for more inbound data */ + if (!pxtcp->inbound_close) { + if (!pxtcp->inbound_pull) { + /* wake up producer, in case it has stopped polling for POLLIN */ + pxtcp_chan_send_weak(POLLMGR_CHAN_PXTCP_POLLIN, pxtcp); +#ifdef RT_OS_WINDOWS + /** + * We have't got enought room in ring buffer to read atm, + * but we don't want to lose notification from WSAW4ME when + * space would be available, so we reset event with empty recv + */ + recv(pxtcp->sock, NULL, 0, 0); +#endif + } + else { + ssize_t nread; + int stop_pollin; /* ignored */ + + nread = pxtcp_sock_read(pxtcp, &stop_pollin); + + if (nread < 0) { + int sockerr = -(int)nread; + LWIP_UNUSED_ARG(sockerr); + DPRINTF0(("%s: sock %d: %R[sockerr]\n", + __func__, pxtcp->sock, sockerr)); + +#if HAVE_TCP_POLLHUP == POLLIN /* see counterpart in pxtcp_pmgr_pump() */ + /* + * It may still be registered with poll manager for POLLOUT. + */ + pxtcp_chan_send_weak(POLLMGR_CHAN_PXTCP_RESET, pxtcp); + return ERR_OK; +#else + /* + * It is no longer registered with poll manager so we + * can kill it directly. + */ + pxtcp_pcb_reset_pxtcp(pxtcp); + return ERR_ABRT; +#endif + } + } + } + + /* forward more data if we can */ + if (!pxtcp->inbound_close_done) { + pxtcp_pcb_forward_inbound(pxtcp); + + /* + * NB: we might have dissociated from a pcb that transitioned + * to LAST_ACK state, so don't refer to pcb below. + */ + } + + + /* have we got all the acks? */ + if (pxtcp->inbound_close /* no more new data */ + && pxtcp->inbuf.unsent == pxtcp->inbuf.vacant /* all data is sent */ + && unacked == pxtcp->inbuf.unsent) /* ... and is acked */ + { + char *buf; + + DPRINTF(("%s: pxtcp %p; pcb %p; all data ACKed\n", + __func__, (void *)pxtcp, (void *)pxtcp->pcb)); + + /* no more retransmits, so buf is not needed */ + buf = pxtcp->inbuf.buf; + pxtcp->inbuf.buf = NULL; + free(buf); + + /* no more acks, so no more callbacks */ + if (pxtcp->pcb != NULL) { + tcp_sent(pxtcp->pcb, NULL); + } + + /* + * We may be the last callback for this pcb if we have also + * successfully forwarded inbound_close. + */ + pxtcp_pcb_maybe_deferred_delete(pxtcp); + } + + return ERR_OK; +} + + +#if HAVE_TCP_POLLHUP +/** + * Callback from poll manager (pxtcp::msg_inpull) to switch + * pxtcp_pcb_sent() to actively pull the last bits of input. See + * POLLHUP comment in pxtcp_pmgr_pump(). + * + * pxtcp::sock is deregistered from poll manager after this callback + * is scheduled. + */ +static void +pxtcp_pcb_pull_inbound(void *ctx) +{ + struct pxtcp *pxtcp = (struct pxtcp *)ctx; + LWIP_ASSERT1(pxtcp != NULL); + + if (pxtcp->pcb == NULL) { + DPRINTF(("%s: pxtcp %p: PCB IS GONE\n", __func__, (void *)pxtcp)); + pxtcp_pcb_reset_pxtcp(pxtcp); + return; + } + + pxtcp->inbound_pull = 1; + if (pxtcp->pmhdl.slot < 0) { + DPRINTF(("%s: pxtcp %p: pcb %p (deferred delete)\n", + __func__, (void *)pxtcp, (void *)pxtcp->pcb)); + pxtcp->deferred_delete = 1; + } + else { + DPRINTF(("%s: pxtcp %p: pcb %p\n", + __func__, (void *)pxtcp, (void *)pxtcp->pcb)); + } + + pxtcp_pcb_sent(pxtcp, pxtcp->pcb, 0); +} +#endif /* HAVE_TCP_POLLHUP */ + + +/** + * tcp_err() callback. + * + * pcb is not passed to this callback since it may be already + * deallocated by the stack, but we can't do anything useful with it + * anyway since connection is gone. + */ +static void +pxtcp_pcb_err(void *arg, err_t error) +{ + struct pxtcp *pxtcp = (struct pxtcp *)arg; + LWIP_ASSERT1(pxtcp != NULL); + + /* + * ERR_CLSD is special - it is reported here when: + * + * . guest has already half-closed + * . we send FIN to guest when external half-closes + * . guest acks that FIN + * + * Since connection is closed but receive has been already closed + * lwip can only report this via tcp_err. At this point the pcb + * is still alive, so we can peek at it if need be. + * + * The interesting twist is when the ACK from guest that akcs our + * FIN also acks some data. In this scenario lwip will NOT call + * tcp_sent() callback with the ACK for that last bit of data but + * instead will call tcp_err with ERR_CLSD right away. Since that + * ACK also acknowledges all the data, we should run some of + * pxtcp_pcb_sent() logic here. + */ + if (error == ERR_CLSD) { + struct tcp_pcb *pcb = pxtcp->pcb; /* still alive */ + + DPRINTF2(("ERR_CLSD: pxtcp %p; pcb %p:" + " pcb->acked %d;" + " unacked %d, unsent %d, vacant %d\n", + (void *)pxtcp, (void *)pcb, + pcb->acked, + (int)pxtcp->inbuf.unacked, + (int)pxtcp->inbuf.unsent, + (int)pxtcp->inbuf.vacant)); + + LWIP_ASSERT1(pxtcp->pcb == pcb); + LWIP_ASSERT1(pcb->callback_arg == pxtcp); + + if (pcb->acked > 0) { + pxtcp_pcb_sent(pxtcp, pcb, pcb->acked); + } + return; + } + + DPRINTF0(("tcp_err: pxtcp=%p, error=%s\n", + (void *)pxtcp, proxy_lwip_strerr(error))); + + pxtcp->pcb = NULL; /* pcb is gone */ + if (pxtcp->deferred_delete) { + pxtcp_pcb_reset_pxtcp(pxtcp); + } + else { + pxtcp_chan_send_weak(POLLMGR_CHAN_PXTCP_RESET, pxtcp); + } +} diff --git a/src/VBox/NetworkServices/NAT/pxtcp.h b/src/VBox/NetworkServices/NAT/pxtcp.h new file mode 100644 index 00000000..6e182411 --- /dev/null +++ b/src/VBox/NetworkServices/NAT/pxtcp.h @@ -0,0 +1,52 @@ +/* $Id: pxtcp.h $ */ +/** @file + * NAT Network - TCP proxy, internal interface declarations. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#ifndef VBOX_INCLUDED_SRC_NAT_pxtcp_h +#define VBOX_INCLUDED_SRC_NAT_pxtcp_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#include "lwip/err.h" +#include "lwip/ip_addr.h" + +struct pbuf; +struct tcp_pcb; +struct pxtcp; +struct fwspec; + +err_t pxtcp_pcb_accept_outbound(struct tcp_pcb *, struct pbuf *, int, ipX_addr_t *, u16_t); + +struct pxtcp *pxtcp_create_forwarded(SOCKET); +void pxtcp_cancel_forwarded(struct pxtcp *); + +void pxtcp_pcb_connect(struct pxtcp *, const struct fwspec *); + +int pxtcp_pmgr_add(struct pxtcp *); +void pxtcp_pmgr_del(struct pxtcp *); + +#endif /* !VBOX_INCLUDED_SRC_NAT_pxtcp_h */ diff --git a/src/VBox/NetworkServices/NAT/pxudp.c b/src/VBox/NetworkServices/NAT/pxudp.c new file mode 100644 index 00000000..1c8fab12 --- /dev/null +++ b/src/VBox/NetworkServices/NAT/pxudp.c @@ -0,0 +1,858 @@ +/* $Id: pxudp.c $ */ +/** @file + * NAT Network - UDP proxy. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#define LOG_GROUP LOG_GROUP_NAT_SERVICE + +#include "winutils.h" +#include "proxy.h" +#include "proxy_pollmgr.h" +#include "pxremap.h" + +#ifndef RT_OS_WINDOWS +#include <sys/types.h> +#include <sys/socket.h> +#ifdef RT_OS_DARWIN +# define __APPLE_USE_RFC_3542 +#endif +#include <netinet/in.h> +#include <stdlib.h> +#include <stdint.h> +#include <stdio.h> +#include <poll.h> + +#include <err.h> /* BSD'ism */ +#else +#include <stdlib.h> +#include <iprt/stdint.h> +#include <stdio.h> +#include "winpoll.h" +#endif + +#include "lwip/opt.h" + +#include "lwip/sys.h" +#include "lwip/tcpip.h" +#include "lwip/udp.h" +#include "lwip/icmp.h" + +struct pxudp { + /** + * Our poll manager handler. + */ + struct pollmgr_handler pmhdl; + + /** + * lwIP ("internal") side of the proxied connection. + */ + struct udp_pcb *pcb; + + /** + * Host ("external") side of the proxied connection. + */ + SOCKET sock; + + /** + * Is this pcb a mapped host loopback? + */ + int is_mapped; + + /** + * Cached value of TTL socket option. + */ + int ttl; + + /** + * Cached value of TOS socket option. + */ + int tos; + + /** + * Cached value of "don't fragment" socket option. + */ + int df; + + /** + * For some protocols (notably: DNS) we know we are getting just + * one reply, so we don't want the pcb and the socket to sit there + * waiting to be g/c'ed by timeout. This field counts request and + * replies for them. + */ + int count; + + /** + * Mailbox for inbound pbufs. + * + * XXX: since we have single producer and single consumer we can + * use lockless ringbuf like for pxtcp. + */ + sys_mbox_t inmbox; + + /** + * lwIP thread's strong reference to us. + */ + struct pollmgr_refptr *rp; + + /* + * We use static messages to void malloc/free overhead. + */ + struct tcpip_msg msg_delete; /* delete pxudp */ + struct tcpip_msg msg_inbound; /* trigger send of inbound data */ +}; + + +static struct pxudp *pxudp_allocate(void); +static void pxudp_drain_inmbox(struct pxudp *); +static void pxudp_free(struct pxudp *); + +static struct udp_pcb *pxudp_pcb_dissociate(struct pxudp *); + +/* poll manager callbacks for pxudp related channels */ +static int pxudp_pmgr_chan_add(struct pollmgr_handler *, SOCKET, int); +static int pxudp_pmgr_chan_del(struct pollmgr_handler *, SOCKET, int); + +/* helper functions for sending/receiving pxudp over poll manager channels */ +static ssize_t pxudp_chan_send(enum pollmgr_slot_t, struct pxudp *); +static ssize_t pxudp_chan_send_weak(enum pollmgr_slot_t, struct pxudp *); +static struct pxudp *pxudp_chan_recv(struct pollmgr_handler *, SOCKET, int); +static struct pxudp *pxudp_chan_recv_strong(struct pollmgr_handler *, SOCKET, int); + +/* poll manager callbacks for individual sockets */ +static int pxudp_pmgr_pump(struct pollmgr_handler *, SOCKET, int); + +/* convenience function for poll manager callback */ +static int pxudp_schedule_delete(struct pxudp *); + +/* lwip thread callbacks called via proxy_lwip_post() */ +static void pxudp_pcb_delete_pxudp(void *); + +/* outbound ttl check */ +static int pxudp_ttl_expired(struct pbuf *); + +/* udp pcb callbacks &c */ +static void pxudp_pcb_accept(void *, struct udp_pcb *, struct pbuf *, ip_addr_t *, u16_t); +static void pxudp_pcb_recv(void *, struct udp_pcb *, struct pbuf *, ip_addr_t *, u16_t); +static void pxudp_pcb_forward_outbound(struct pxudp *, struct pbuf *, ip_addr_t *, u16_t); +static void pxudp_pcb_expired(struct pxudp *); +static void pxudp_pcb_write_inbound(void *); +static void pxudp_pcb_forward_inbound(struct pxudp *); + +/* poll manager handlers for pxudp channels */ +static struct pollmgr_handler pxudp_pmgr_chan_add_hdl; +static struct pollmgr_handler pxudp_pmgr_chan_del_hdl; + + +void +pxudp_init(void) +{ + /* + * Create channels. + */ + pxudp_pmgr_chan_add_hdl.callback = pxudp_pmgr_chan_add; + pxudp_pmgr_chan_add_hdl.data = NULL; + pxudp_pmgr_chan_add_hdl.slot = -1; + pollmgr_add_chan(POLLMGR_CHAN_PXUDP_ADD, &pxudp_pmgr_chan_add_hdl); + + pxudp_pmgr_chan_del_hdl.callback = pxudp_pmgr_chan_del; + pxudp_pmgr_chan_del_hdl.data = NULL; + pxudp_pmgr_chan_del_hdl.slot = -1; + pollmgr_add_chan(POLLMGR_CHAN_PXUDP_DEL, &pxudp_pmgr_chan_del_hdl); + + udp_proxy_accept(pxudp_pcb_accept); +} + + +/** + * Syntactic sugar for sending pxudp pointer over poll manager + * channel. Used by lwip thread functions. + */ +static ssize_t +pxudp_chan_send(enum pollmgr_slot_t chan, struct pxudp *pxudp) +{ + return pollmgr_chan_send(chan, &pxudp, sizeof(pxudp)); +} + + +/** + * Syntactic sugar for sending weak reference to pxudp over poll + * manager channel. Used by lwip thread functions. + */ +static ssize_t +pxudp_chan_send_weak(enum pollmgr_slot_t chan, struct pxudp *pxudp) +{ + pollmgr_refptr_weak_ref(pxudp->rp); + return pollmgr_chan_send(chan, &pxudp->rp, sizeof(pxudp->rp)); +} + + +/** + * Counterpart of pxudp_chan_send(). + */ +static struct pxudp * +pxudp_chan_recv(struct pollmgr_handler *handler, SOCKET fd, int revents) +{ + struct pxudp *pxudp; + + pxudp = (struct pxudp *)pollmgr_chan_recv_ptr(handler, fd, revents); + return pxudp; +} + + +/** + * Counterpart of pxudp_chan_send_weak(). + */ +struct pxudp * +pxudp_chan_recv_strong(struct pollmgr_handler *handler, SOCKET fd, int revents) +{ + struct pollmgr_refptr *rp; + struct pollmgr_handler *base; + struct pxudp *pxudp; + + rp = (struct pollmgr_refptr *)pollmgr_chan_recv_ptr(handler, fd, revents); + base = (struct pollmgr_handler *)pollmgr_refptr_get(rp); + pxudp = (struct pxudp *)base; + + return pxudp; +} + + +/** + * POLLMGR_CHAN_PXUDP_ADD handler. + * + * Get new pxudp from lwip thread and start polling its socket. + */ +static int +pxudp_pmgr_chan_add(struct pollmgr_handler *handler, SOCKET fd, int revents) +{ + struct pxudp *pxudp; + int status; + + pxudp = pxudp_chan_recv(handler, fd, revents); + DPRINTF(("pxudp_add: new pxudp %p; pcb %p\n", + (void *)pxudp, (void *)pxudp->pcb)); + + LWIP_ASSERT1(pxudp != NULL); + LWIP_ASSERT1(pxudp->pmhdl.callback != NULL); + LWIP_ASSERT1(pxudp->pmhdl.data = (void *)pxudp); + LWIP_ASSERT1(pxudp->pmhdl.slot < 0); + + + status = pollmgr_add(&pxudp->pmhdl, pxudp->sock, POLLIN); + if (status < 0) { + pxudp_schedule_delete(pxudp); + } + + return POLLIN; +} + + +/** + * POLLMGR_CHAN_PXUDP_DEL handler. + */ +static int +pxudp_pmgr_chan_del(struct pollmgr_handler *handler, SOCKET fd, int revents) +{ + struct pxudp *pxudp; + + pxudp = pxudp_chan_recv_strong(handler, fd, revents); + if (pxudp == NULL) { + return POLLIN; + } + + DPRINTF(("pxudp_del: pxudp %p; socket %d\n", (void *)pxudp, pxudp->sock)); + + pollmgr_del_slot(pxudp->pmhdl.slot); + + /* + * Go back to lwip thread to delete after any pending callbacks + * for unprocessed inbound traffic are drained. + */ + pxudp_schedule_delete(pxudp); + + return POLLIN; +} + + +static struct pxudp * +pxudp_allocate(void) +{ + struct pxudp *pxudp; + err_t error; + + pxudp = (struct pxudp *)malloc(sizeof(*pxudp)); + if (pxudp == NULL) { + return NULL; + } + + pxudp->pmhdl.callback = NULL; + pxudp->pmhdl.data = (void *)pxudp; + pxudp->pmhdl.slot = -1; + + pxudp->pcb = NULL; + pxudp->sock = INVALID_SOCKET; + pxudp->df = -1; + pxudp->ttl = -1; + pxudp->tos = -1; + pxudp->count = 0; + + pxudp->rp = pollmgr_refptr_create(&pxudp->pmhdl); + if (pxudp->rp == NULL) { + free(pxudp); + return NULL; + } + + error = sys_mbox_new(&pxudp->inmbox, 16); + if (error != ERR_OK) { + pollmgr_refptr_unref(pxudp->rp); + free(pxudp); + return NULL; + } + +#define CALLBACK_MSG(MSG, FUNC) \ + do { \ + pxudp->MSG.type = TCPIP_MSG_CALLBACK_STATIC; \ + pxudp->MSG.sem = NULL; \ + pxudp->MSG.msg.cb.function = FUNC; \ + pxudp->MSG.msg.cb.ctx = (void *)pxudp; \ + } while (0) + + CALLBACK_MSG(msg_delete, pxudp_pcb_delete_pxudp); + CALLBACK_MSG(msg_inbound, pxudp_pcb_write_inbound); + + return pxudp; +} + + +static void +pxudp_drain_inmbox(struct pxudp *pxudp) +{ + void *ptr; + + if (!sys_mbox_valid(&pxudp->inmbox)) { + return; + } + + while (sys_mbox_tryfetch(&pxudp->inmbox, &ptr) != SYS_MBOX_EMPTY) { + struct pbuf *p = (struct pbuf *)ptr; + pbuf_free(p); + } + + sys_mbox_free(&pxudp->inmbox); + sys_mbox_set_invalid(&pxudp->inmbox); +} + + +static void +pxudp_free(struct pxudp *pxudp) +{ + pxudp_drain_inmbox(pxudp); + free(pxudp); +} + + +/** + * Dissociate pxudp and its udp_pcb. + * + * Unlike its TCP cousin returns the pcb since UDP pcbs need to be + * actively deleted, so save callers the trouble of saving a copy + * before calling us. + */ +static struct udp_pcb * +pxudp_pcb_dissociate(struct pxudp *pxudp) +{ + struct udp_pcb *pcb; + + if (pxudp == NULL || pxudp->pcb == NULL) { + return NULL; + } + + pcb = pxudp->pcb; + + udp_recv(pxudp->pcb, NULL, NULL); + pxudp->pcb = NULL; + + return pcb; +} + + +/** + * Lwip thread callback invoked via pxudp::msg_delete + * + * Since we use static messages to communicate to the lwip thread, we + * cannot delete pxudp without making sure there are no unprocessed + * messages in the lwip thread mailbox. + * + * The easiest way to ensure that is to send this "delete" message as + * the last one and when it's processed we know there are no more and + * it's safe to delete pxudp. + * + * Channel callback should use pxudp_schedule_delete() convenience + * function defined below. + */ +static void +pxudp_pcb_delete_pxudp(void *arg) +{ + struct pxudp *pxudp = (struct pxudp *)arg; + struct udp_pcb *pcb; + + LWIP_ASSERT1(pxudp != NULL); + + if (pxudp->sock != INVALID_SOCKET) { + closesocket(pxudp->sock); + pxudp->sock = INVALID_SOCKET; + } + + pcb = pxudp_pcb_dissociate(pxudp); + if (pcb != NULL) { + udp_remove(pcb); + } + + pollmgr_refptr_unref(pxudp->rp); + pxudp_free(pxudp); +} + + +/** + * Poll manager callback should use this convenience wrapper to + * schedule pxudp deletion on the lwip thread and to deregister from + * the poll manager. + */ +static int +pxudp_schedule_delete(struct pxudp *pxudp) +{ + /* + * If pollmgr_refptr_get() is called by any channel before + * scheduled deletion happens, let them know we are gone. + */ + pxudp->pmhdl.slot = -1; + + /* + * Schedule deletion. Since poll manager thread may be pre-empted + * right after we send the message, the deletion may actually + * happen on the lwip thread before we return from this function, + * so it's not safe to refer to pxudp after this call. + */ + proxy_lwip_post(&pxudp->msg_delete); + + /* tell poll manager to deregister us */ + return -1; +} + + +/** + * Outbound TTL/HOPL check. + */ +static int +pxudp_ttl_expired(struct pbuf *p) +{ + int ttl; + + if (ip_current_is_v6()) { + ttl = IP6H_HOPLIM(ip6_current_header()); + } + else { + ttl = IPH_TTL(ip_current_header()); + } + + if (RT_UNLIKELY(ttl <= 1)) { + int status = pbuf_header(p, ip_current_header_tot_len() + UDP_HLEN); + if (RT_LIKELY(status == 0)) { + if (ip_current_is_v6()) { + icmp6_time_exceeded(p, ICMP6_TE_HL); + } + else { + icmp_time_exceeded(p, ICMP_TE_TTL); + } + } + pbuf_free(p); + return 1; + } + + return 0; +} + + +/** + * New proxied UDP conversation created. + * Global callback for udp_proxy_accept(). + */ +static void +pxudp_pcb_accept(void *arg, struct udp_pcb *newpcb, struct pbuf *p, + ip_addr_t *addr, u16_t port) +{ + struct pxudp *pxudp; + ipX_addr_t dst_addr; + int mapping; + int sdom; + SOCKET sock; + + LWIP_ASSERT1(newpcb != NULL); + LWIP_ASSERT1(p != NULL); + LWIP_UNUSED_ARG(arg); + + mapping = pxremap_outbound_ipX(PCB_ISIPV6(newpcb), &dst_addr, &newpcb->local_ip); + if (mapping != PXREMAP_MAPPED && pxudp_ttl_expired(p)) { + udp_remove(newpcb); + return; + } + + pxudp = pxudp_allocate(); + if (pxudp == NULL) { + DPRINTF(("pxudp_allocate: failed\n")); + udp_remove(newpcb); + pbuf_free(p); + return; + } + + sdom = PCB_ISIPV6(newpcb) ? PF_INET6 : PF_INET; + pxudp->is_mapped = (mapping == PXREMAP_MAPPED); + +#if 0 /* XXX: DNS IPv6->IPv4 remapping hack */ + if (pxudp->is_mapped + && newpcb->local_port == 53 + && PCB_ISIPV6(newpcb)) + { + /* + * "Remap" DNS over IPv6 to IPv4 since Ubuntu dnsmasq does not + * listen on IPv6. + */ + sdom = PF_INET; + ipX_addr_set_loopback(0, &dst_addr); + } +#endif /* DNS IPv6->IPv4 remapping hack */ + + sock = proxy_connected_socket(sdom, SOCK_DGRAM, + &dst_addr, newpcb->local_port); + if (sock == INVALID_SOCKET) { + udp_remove(newpcb); + pbuf_free(p); + return; + } + + pxudp->sock = sock; + pxudp->pcb = newpcb; + udp_recv(newpcb, pxudp_pcb_recv, pxudp); + + pxudp->pmhdl.callback = pxudp_pmgr_pump; + pxudp_chan_send(POLLMGR_CHAN_PXUDP_ADD, pxudp); + + /* dispatch directly instead of calling pxudp_pcb_recv() */ + pxudp_pcb_forward_outbound(pxudp, p, addr, port); +} + + +/** + * udp_recv() callback. + */ +static void +pxudp_pcb_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, + ip_addr_t *addr, u16_t port) +{ + struct pxudp *pxudp = (struct pxudp *)arg; + + LWIP_ASSERT1(pxudp != NULL); + LWIP_ASSERT1(pcb == pxudp->pcb); + LWIP_UNUSED_ARG(pcb); + + if (p != NULL) { + pxudp_pcb_forward_outbound(pxudp, p, addr, port); + } + else { + pxudp_pcb_expired(pxudp); + } +} + + +static void +pxudp_pcb_forward_outbound(struct pxudp *pxudp, struct pbuf *p, + ip_addr_t *addr, u16_t port) +{ + int status; + + LWIP_UNUSED_ARG(addr); + LWIP_UNUSED_ARG(port); + + if (!pxudp->is_mapped && pxudp_ttl_expired(p)) { + return; + } + + if (!ip_current_is_v6()) { /* IPv4 */ + const struct ip_hdr *iph = ip_current_header(); + int ttl, tos, df; + + /* + * Different OSes have different socket options for DF. + * Unlike pxping.c, we can't use IP_HDRINCL here as it's only + * valid for SOCK_RAW. + */ +# define USE_DF_OPTION(_Optname) \ + const int dfopt = _Optname; \ + const char * const dfoptname = #_Optname; \ + RT_NOREF_PV(dfoptname) +#if defined(IP_MTU_DISCOVER) /* Linux */ + USE_DF_OPTION(IP_MTU_DISCOVER); +#elif defined(IP_DONTFRAG) /* Solaris 11+, FreeBSD */ + USE_DF_OPTION(IP_DONTFRAG); +#elif defined(IP_DONTFRAGMENT) /* Windows */ + USE_DF_OPTION(IP_DONTFRAGMENT); +#else + USE_DF_OPTION(0); +#endif + + ttl = IPH_TTL(iph); + if (!pxudp->is_mapped) { + LWIP_ASSERT1(ttl > 1); + --ttl; + } + + if (ttl != pxudp->ttl) { + status = setsockopt(pxudp->sock, IPPROTO_IP, IP_TTL, + (char *)&ttl, sizeof(ttl)); + if (RT_LIKELY(status == 0)) { + pxudp->ttl = ttl; + } + else { + DPRINTF(("IP_TTL: %R[sockerr]\n", SOCKERRNO())); + } + } + + tos = IPH_TOS(iph); + if (tos != pxudp->tos) { + status = setsockopt(pxudp->sock, IPPROTO_IP, IP_TOS, + (char *)&tos, sizeof(tos)); + if (RT_LIKELY(status == 0)) { + pxudp->tos = tos; + } + else { + DPRINTF(("IP_TOS: %R[sockerr]\n", SOCKERRNO())); + } + } + + if (dfopt) { + df = (IPH_OFFSET(iph) & PP_HTONS(IP_DF)) != 0; +#if defined(IP_MTU_DISCOVER) + df = df ? IP_PMTUDISC_DO : IP_PMTUDISC_DONT; +#endif + if (df != pxudp->df) { + status = setsockopt(pxudp->sock, IPPROTO_IP, dfopt, + (char *)&df, sizeof(df)); + if (RT_LIKELY(status == 0)) { + pxudp->df = df; + } + else { + DPRINTF(("%s: %R[sockerr]\n", dfoptname, SOCKERRNO())); + } + } + } + } + else { /* IPv6 */ + const struct ip6_hdr *iph = ip6_current_header(); + int ttl; + + ttl = IP6H_HOPLIM(iph); + if (!pxudp->is_mapped) { + LWIP_ASSERT1(ttl > 1); + --ttl; + } + + if (ttl != pxudp->ttl) { + status = setsockopt(pxudp->sock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, + (char *)&ttl, sizeof(ttl)); + if (RT_LIKELY(status == 0)) { + pxudp->ttl = ttl; + } + else { + DPRINTF(("IPV6_UNICAST_HOPS: %R[sockerr]\n", SOCKERRNO())); + } + } + } + + if (pxudp->pcb->local_port == 53) { + ++pxudp->count; + } + + proxy_sendto(pxudp->sock, p, NULL, 0); + pbuf_free(p); +} + + +/** + * Proxy udp_pcbs are expired by timer, which is signaled by passing + * NULL pbuf to the udp_recv() callback. At that point the pcb is + * removed from the list of proxy udp pcbs so no new datagrams will be + * delivered. + */ +static void +pxudp_pcb_expired(struct pxudp *pxudp) +{ + struct udp_pcb *pcb; + + DPRINTF2(("%s: pxudp %p, pcb %p, sock %d: expired\n", + __func__, (void *)pxudp, (void *)pxudp->pcb, pxudp->sock)); + + pcb = pxudp_pcb_dissociate(pxudp); + if (pcb != NULL) { + udp_remove(pcb); + } + + pxudp_chan_send_weak(POLLMGR_CHAN_PXUDP_DEL, pxudp); +} + + +/** + */ +static int +pxudp_pmgr_pump(struct pollmgr_handler *handler, SOCKET fd, int revents) +{ + struct pxudp *pxudp; + struct pbuf *p; + ssize_t nread; + err_t error; + + pxudp = (struct pxudp *)handler->data; + LWIP_ASSERT1(handler == &pxudp->pmhdl); + LWIP_ASSERT1(fd == pxudp->sock); + LWIP_UNUSED_ARG(fd); + + + if (revents & ~(POLLIN|POLLERR)) { + DPRINTF(("%s: unexpected revents 0x%x\n", __func__, revents)); + return pxudp_schedule_delete(pxudp); + } + + /* + * XXX: AFAICS, there's no way to match the error with the + * outgoing datagram that triggered it, since we do non-blocking + * sends from lwip thread. + */ + if (revents & POLLERR) { + int sockerr = -1; + socklen_t optlen = (socklen_t)sizeof(sockerr); + int status; + + status = getsockopt(pxudp->sock, SOL_SOCKET, + SO_ERROR, (char *)&sockerr, &optlen); + if (status < 0) { + DPRINTF(("%s: sock %d: SO_ERROR failed:%R[sockerr]\n", + __func__, pxudp->sock, SOCKERRNO())); + } + else { + DPRINTF(("%s: sock %d: %R[sockerr]\n", + __func__, pxudp->sock, sockerr)); + } + } + + if ((revents & POLLIN) == 0) { + return POLLIN; + } + +#ifdef RT_OS_WINDOWS + nread = recv(pxudp->sock, (char *)pollmgr_udpbuf, sizeof(pollmgr_udpbuf), 0); +#else + nread = recv(pxudp->sock, pollmgr_udpbuf, sizeof(pollmgr_udpbuf), 0); +#endif + if (nread == SOCKET_ERROR) { + DPRINTF(("%s: %R[sockerr]\n", __func__, SOCKERRNO())); + return POLLIN; + } + + p = pbuf_alloc(PBUF_RAW, (u16_t)nread, PBUF_RAM); + if (p == NULL) { + DPRINTF(("%s: pbuf_alloc(%d) failed\n", __func__, (int)nread)); + return POLLIN; + } + + error = pbuf_take(p, pollmgr_udpbuf, (u16_t)nread); + if (error != ERR_OK) { + DPRINTF(("%s: pbuf_take(%d) failed\n", __func__, (int)nread)); + pbuf_free(p); + return POLLIN; + } + + error = sys_mbox_trypost(&pxudp->inmbox, p); + if (error != ERR_OK) { + pbuf_free(p); + return POLLIN; + } + + proxy_lwip_post(&pxudp->msg_inbound); + + return POLLIN; +} + + +/** + * Callback from poll manager to trigger sending to guest. + */ +static void +pxudp_pcb_write_inbound(void *ctx) +{ + struct pxudp *pxudp = (struct pxudp *)ctx; + LWIP_ASSERT1(pxudp != NULL); + + if (pxudp->pcb == NULL) { + return; + } + + pxudp_pcb_forward_inbound(pxudp); +} + + +static void +pxudp_pcb_forward_inbound(struct pxudp *pxudp) +{ + struct pbuf *p; + u32_t timo; + err_t error; + + if (!sys_mbox_valid(&pxudp->inmbox)) { + return; + } + + timo = sys_mbox_tryfetch(&pxudp->inmbox, (void **)&p); + if (timo == SYS_MBOX_EMPTY) { + return; + } + + error = udp_send(pxudp->pcb, p); + if (error != ERR_OK) { + DPRINTF(("%s: udp_send(pcb %p) err %d\n", + __func__, (void *)pxudp, error)); + } + + pbuf_free(p); + + /* + * If we enabled counting in pxudp_pcb_forward_outbound() check + * that we have (all) the reply(s). + */ + if (pxudp->count > 0) { + --pxudp->count; + if (pxudp->count == 0) { + pxudp_pcb_expired(pxudp); + } + } +} diff --git a/src/VBox/NetworkServices/NAT/rtmon_bsd.c b/src/VBox/NetworkServices/NAT/rtmon_bsd.c new file mode 100644 index 00000000..05bec3da --- /dev/null +++ b/src/VBox/NetworkServices/NAT/rtmon_bsd.c @@ -0,0 +1,126 @@ +/* $Id: rtmon_bsd.c $ */ +/** @file + * NAT Network - IPv6 default route monitor for BSD routing sockets. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + + +#define LOG_GROUP LOG_GROUP_NAT_SERVICE + +#include "proxy.h" + +#include <sys/types.h> +#include <sys/socket.h> + +#include <net/if_dl.h> +#include <net/route.h> + +#include <netinet/in.h> +#include <netinet/ip6.h> + +#include <errno.h> +#include <string.h> +#include <unistd.h> + + +/** + * Query IPv6 routing table - BSD routing sockets version. + * + * We don't actually monitor the routing socket for updates, and + * instead query the kernel each time. + * + * We take a shortcut and don't read the reply to our RTM_GET - if + * there's no default IPv6 route, write(2) will fail with ESRCH + * synchronously. In theory it may fail asynchronously and we should + * wait for the RTM_GET reply and check rt_msghdr::rtm_errno. + * + * KAME code in *BSD maintains internally a list of default routers + * that it learned from RAs, and installs only one of them into the + * routing table (actually, I'm not sure if BSD routing table can + * handle multiple routes to the same destination). One side-effect + * of this is that when manually configured route (e.g. teredo) is + * deleted, the system will lose its default route even when KAME IPv6 + * has default router(s) in its internal list. Next RA will force the + * update, though. + * + * Solaris does expose multiple routes in the routing table and + * replies to RTM_GET with "default default". + */ +int +rtmon_get_defaults(void) +{ + int rtsock; + struct req { + struct rt_msghdr rtm; + struct sockaddr_in6 dst; + struct sockaddr_in6 mask; + struct sockaddr_dl ifp; + } req; + ssize_t nsent; + + rtsock = socket(PF_ROUTE, SOCK_RAW, AF_INET6); + if (rtsock < 0) { + DPRINTF0(("rtmon: failed to create routing socket\n")); + return -1; + } + + memset(&req, 0, sizeof(req)); + + req.rtm.rtm_type = RTM_GET; + req.rtm.rtm_version = RTM_VERSION; + req.rtm.rtm_msglen = sizeof(req); + req.rtm.rtm_seq = 0x12345; + + req.rtm.rtm_flags = RTF_UP; + req.rtm.rtm_addrs = RTA_DST | RTA_NETMASK | RTA_IFP; + + req.dst.sin6_family = AF_INET6; +#if HAVE_SA_LEN + req.dst.sin6_len = sizeof(req.dst); +#endif + + req.mask.sin6_family = AF_INET6; +#if HAVE_SA_LEN + req.mask.sin6_len = sizeof(req.mask); +#endif + + req.ifp.sdl_family = AF_LINK; +#if HAVE_SA_LEN + req.ifp.sdl_len = sizeof(req.ifp); +#endif + + nsent = write(rtsock, &req, req.rtm.rtm_msglen); + if (nsent < 0) { + if (errno == ESRCH) { + /* there's no default route */ + return 0; + } + else { + DPRINTF0(("rtmon: failed to send RTM_GET\n")); + return -1; + } + } + + return 1; +} diff --git a/src/VBox/NetworkServices/NAT/rtmon_linux.c b/src/VBox/NetworkServices/NAT/rtmon_linux.c new file mode 100644 index 00000000..1ef37e34 --- /dev/null +++ b/src/VBox/NetworkServices/NAT/rtmon_linux.c @@ -0,0 +1,259 @@ +/* $Id: rtmon_linux.c $ */ +/** @file + * NAT Network - IPv6 default route monitor for Linux netlink. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + + +#define LOG_GROUP LOG_GROUP_NAT_SERVICE + +#include "proxy.h" + +#include <sys/types.h> /* must come before linux/netlink */ +#include <sys/socket.h> + +#include <asm/types.h> +#include <linux/netlink.h> +#include <linux/rtnetlink.h> + +#include <errno.h> +#include <string.h> +#include <unistd.h> + + +static int rtmon_check_defaults(const void *buf, size_t len); + + +/** + * Read IPv6 routing table - Linux rtnetlink version. + * + * XXX: TODO: To avoid re-reading the table we should subscribe to + * updates by binding a monitoring NETLINK_ROUTE socket to + * sockaddr_nl::nl_groups = RTMGRP_IPV6_ROUTE. + * + * But that will provide updates only. Documentation is scarce, but + * from what I've seen it seems that to get accurate routing info the + * monitoring socket needs to be created first, then full routing + * table requested (easier to do via spearate socket), then monitoring + * socket polled for input. The first update(s) of the monitoring + * socket may happen before full table is returned, so we can't just + * count the defaults, we need to keep track of their { oif, gw } to + * correctly ignore updates that are reported via monitoring socket, + * but that are already reflected in the full routing table returned + * in response to our request. + */ +int +rtmon_get_defaults(void) +{ + int rtsock; + ssize_t nsent, ssize; + int ndefrts; + + char *buf = NULL; + size_t bufsize; + + struct { + struct nlmsghdr nh; + struct rtmsg rtm; + char attrbuf[512]; + } rtreq; + + memset(&rtreq, 0, sizeof(rtreq)); + rtreq.nh.nlmsg_type = RTM_GETROUTE; + rtreq.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP; + rtreq.rtm.rtm_family = AF_INET6; + rtreq.rtm.rtm_table = RT_TABLE_MAIN; + rtreq.rtm.rtm_protocol = RTPROT_UNSPEC; + + rtreq.nh.nlmsg_len = NLMSG_SPACE(sizeof(rtreq.rtm)); + + bufsize = 1024; + ssize = bufsize; + for (;;) { + char *newbuf; + int recverr; + + newbuf = (char *)realloc(buf, ssize); + if (newbuf == NULL) { + DPRINTF0(("rtmon: failed to %sallocate buffer\n", + buf == NULL ? "" : "re")); + free(buf); + return -1; + } + + buf = newbuf; + bufsize = ssize; + + /* it's easier to reopen than to flush */ + rtsock = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE); + if (rtsock < 0) { + DPRINTF0(("rtmon: failed to create netlink socket: %s", strerror(errno))); + free(buf); + return -1; + } + + nsent = send(rtsock, &rtreq, rtreq.nh.nlmsg_len, 0); + if (nsent < 0) { + DPRINTF0(("rtmon: RTM_GETROUTE failed: %s", strerror(errno))); + close (rtsock); + free(buf); + return -1; + } + + ssize = recv(rtsock, buf, bufsize, MSG_TRUNC); + recverr = errno; + close (rtsock); + + if (ssize < 0) { + DPRINTF(("rtmon: failed to read RTM_GETROUTE response: %s", + strerror(recverr))); + free(buf); + return -1; + } + + if ((size_t)ssize <= bufsize) { + DPRINTF2(("rtmon: RTM_GETROUTE: %lu bytes\n", + (unsigned long)ssize)); + break; + } + + DPRINTF2(("rtmon: RTM_GETROUTE: truncated %lu to %lu bytes, retrying\n", + (unsigned long)ssize, (unsigned long)bufsize)); + /* try again with larger buffer */ + } + + ndefrts = rtmon_check_defaults(buf, (size_t)ssize); + free(buf); + + if (ndefrts == 0) { + DPRINTF(("rtmon: no IPv6 default routes found\n")); + } + else { + DPRINTF(("rtmon: %d IPv6 default route%s found\n", + ndefrts, + ndefrts == 1 || ndefrts == -1 ? "" : "s")); + } + + return ndefrts; +} + + +/** + * Scan netlink message in the buffer for IPv6 default route changes. + */ +static int +rtmon_check_defaults(const void *buf, size_t len) +{ + struct nlmsghdr *nh; + int dfltdiff = 0; + + for (nh = (struct nlmsghdr *)buf; + NLMSG_OK(nh, len); + nh = NLMSG_NEXT(nh, len)) + { + struct rtmsg *rtm; + struct rtattr *rta; + int attrlen; + int delta = 0; + const void *gwbuf; + size_t gwlen; + int oif; + + DPRINTF2(("nlmsg seq %d type %d flags 0x%x\n", + nh->nlmsg_seq, nh->nlmsg_type, nh->nlmsg_flags)); + + if (nh->nlmsg_type == NLMSG_DONE) { + break; + } + + if (nh->nlmsg_type == NLMSG_ERROR) { + struct nlmsgerr *ne = (struct nlmsgerr *)NLMSG_DATA(nh); + DPRINTF2(("> error %d\n", ne->error)); + LWIP_UNUSED_ARG(ne); + break; + } + + if (nh->nlmsg_type < RTM_BASE || RTM_MAX <= nh->nlmsg_type) { + /* shouldn't happen */ + DPRINTF2(("> not an RTM message!\n")); + continue; + } + + + rtm = (struct rtmsg *)NLMSG_DATA(nh); + attrlen = RTM_PAYLOAD(nh); + + if (nh->nlmsg_type == RTM_NEWROUTE) { + delta = +1; + } + else if (nh->nlmsg_type == RTM_DELROUTE) { + delta = -1; + } + else { + /* shouldn't happen */ + continue; + } + + /* + * Is this an IPv6 default route in the main table? (Local + * table always has ::/0 reject route, hence the last check). + */ + if (rtm->rtm_family == AF_INET6 /* should always be true */ + && rtm->rtm_dst_len == 0 + && rtm->rtm_table == RT_TABLE_MAIN) + { + dfltdiff += delta; + } + else { + /* some other route change */ + continue; + } + + + gwbuf = NULL; + gwlen = 0; + oif = -1; + + for (rta = RTM_RTA(rtm); + RTA_OK(rta, attrlen); + rta = RTA_NEXT(rta, attrlen)) + { + if (rta->rta_type == RTA_GATEWAY) { + gwbuf = RTA_DATA(rta); + gwlen = RTA_PAYLOAD(rta); + } + else if (rta->rta_type == RTA_OIF) { + /* assert RTA_PAYLOAD(rta) == 4 */ + memcpy(&oif, RTA_DATA(rta), sizeof(oif)); + } + } + + /* XXX: TODO: note that { oif, gw } was added/removed */ + LWIP_UNUSED_ARG(gwbuf); + LWIP_UNUSED_ARG(gwlen); + LWIP_UNUSED_ARG(oif); + } + + return dfltdiff; +} diff --git a/src/VBox/NetworkServices/NAT/rtmon_win.c b/src/VBox/NetworkServices/NAT/rtmon_win.c new file mode 100644 index 00000000..7ceb431b --- /dev/null +++ b/src/VBox/NetworkServices/NAT/rtmon_win.c @@ -0,0 +1,31 @@ +/* $Id: rtmon_win.c $ */ +/** @file + * NAT Network - IPv6 default route monitor for Windows. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +int +rtmon_get_defaults(void) { + return 0; +} diff --git a/src/VBox/NetworkServices/NAT/tftp.h b/src/VBox/NetworkServices/NAT/tftp.h new file mode 100644 index 00000000..7e8d67b4 --- /dev/null +++ b/src/VBox/NetworkServices/NAT/tftp.h @@ -0,0 +1,59 @@ +/* $Id: tftp.h $ */ +/** @file + * NAT Network - Definitions for TFTP protocol. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#ifndef VBOX_INCLUDED_SRC_NAT_tftp_h +#define VBOX_INCLUDED_SRC_NAT_tftp_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#define TFTP_SERVER_PORT 69 + +/* opcodes */ +#define TFTP_RRQ 1 +#define TFTP_WRQ 2 +#define TFTP_DATA 3 +#define TFTP_ACK 4 +#define TFTP_ERROR 5 +/* RFC 2347 */ +#define TFTP_OACK 6 + + +/* error codes */ +#define TFTP_EUNDEF 0 /* Not defined, see error message (if any). */ +#define TFTP_ENOENT 1 /* File not found. */ +#define TFTP_EACCESS 2 /* Access violation. */ +#define TFTP_EFBIG 3 /* Disk full or allocation exceeded. */ +#define TFTP_ENOSYS 4 /* Illegal TFTP operation. */ +#define TFTP_ESRCH 5 /* Unknown transfer ID. */ +#define TFTP_EEXIST 6 /* File already exists. */ +#define TFTP_EUSER 7 /* No such user. */ +/* RFC 2347 */ +#define TFTP_EONAK 8 /* Option refused. */ + + +#endif /* !VBOX_INCLUDED_SRC_NAT_tftp_h */ diff --git a/src/VBox/NetworkServices/NAT/winpoll.h b/src/VBox/NetworkServices/NAT/winpoll.h new file mode 100644 index 00000000..5223946d --- /dev/null +++ b/src/VBox/NetworkServices/NAT/winpoll.h @@ -0,0 +1,63 @@ +/* $Id: winpoll.h $ */ +/** @file + * NAT Network - poll(2) for winsock, definitions and declarations. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#ifndef VBOX_INCLUDED_SRC_NAT_winpoll_h +#define VBOX_INCLUDED_SRC_NAT_winpoll_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif +# include <iprt/cdefs.h> +/** + * WinSock2 has definition for POLL* and pollfd, but it defined for _WIN32_WINNT > 0x0600 + * and used in WSAPoll, which has very unclear history. + */ +# if(_WIN32_WINNT < 0x0600) +# define POLLRDNORM 0x0100 +# define POLLRDBAND 0x0200 +# define POLLIN (POLLRDNORM | POLLRDBAND) +# define POLLPRI 0x0400 + +# define POLLWRNORM 0x0010 +# define POLLOUT (POLLWRNORM) +# define POLLWRBAND 0x0020 + +# define POLLERR 0x0001 +# define POLLHUP 0x0002 +# define POLLNVAL 0x0004 + +struct pollfd { + + SOCKET fd; + SHORT events; + SHORT revents; + +}; +#endif +RT_C_DECLS_BEGIN +int RTWinPoll(struct pollfd *pFds, unsigned int nfds, int timeout, int *pNready); +RT_C_DECLS_END +#endif /* !VBOX_INCLUDED_SRC_NAT_winpoll_h */ diff --git a/src/VBox/NetworkServices/NAT/winutils.h b/src/VBox/NetworkServices/NAT/winutils.h new file mode 100644 index 00000000..be34680a --- /dev/null +++ b/src/VBox/NetworkServices/NAT/winutils.h @@ -0,0 +1,220 @@ +/* $Id: winutils.h $ */ +/** @file + * NAT Network - winsock compatibility shim. + */ + +/* + * Copyright (C) 2013-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#ifndef VBOX_INCLUDED_SRC_NAT_winutils_h +#define VBOX_INCLUDED_SRC_NAT_winutils_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +# include <iprt/cdefs.h> + +# ifdef RT_OS_WINDOWS +# include <iprt/win/winsock2.h> +# include <iprt/win/ws2tcpip.h> +# include <mswsock.h> +# include <iprt/win/windows.h> +# include <iprt/err.h> +# include <iprt/net.h> +# include <iprt/log.h> +/** + * Inclusion of lwip/def.h was added here to avoid conflict of definitions + * of hton-family functions in LWIP and windock's headers. + */ +# include <lwip/def.h> + +# ifndef PF_LOCAL +# define PF_LOCAL AF_INET +# endif + +# ifdef DEBUG +# define err(code,...) do { \ + AssertMsgFailed((__VA_ARGS__)); \ + }while(0) +#else +# define err(code,...) do { \ + DPRINTF0((__VA_ARGS__)); \ + ExitProcess(code); \ + }while(0) +#endif +# define errx err +# define __func__ __FUNCTION__ +# define __attribute__(x) /* IGNORE */ + +# define SOCKERRNO() (WSAGetLastError()) +# define SET_SOCKERRNO(error) do { WSASetLastError(error); } while (0) + +/** + * "Windows Sockets Error Codes" obtained with WSAGetLastError(). + * http://msdn.microsoft.com/en-us/library/windows/desktop/ms740668(v=vs.85).aspx + * + * This block of error codes from <winsock2.h> conflicts with "POSIX + * supplement" error codes from <errno.h>, but we don't expect to ever + * encounter the latter in the proxy code, so redefine them to their + * unixy names. + */ +# undef EWOULDBLOCK +# define EWOULDBLOCK WSAEWOULDBLOCK +# undef EINPROGRESS +# define EINPROGRESS WSAEINPROGRESS +# undef EALREADY +# define EALREADY WSAEALREADY +# undef ENOTSOCK +# define ENOTSOCK WSAENOTSOCK +# undef EDESTADDRREQ +# define EDESTADDRREQ WSAEDESTADDRREQ +# undef EMSGSIZE +# define EMSGSIZE WSAEMSGSIZE +# undef EPROTOTYPE +# define EPROTOTYPE WSAEPROTOTYPE +# undef ENOPROTOOPT +# define ENOPROTOOPT WSAENOPROTOOPT +# undef EPROTONOSUPPORT +# define EPROTONOSUPPORT WSAEPROTONOSUPPORT +# undef ESOCKTNOSUPPORT +# define ESOCKTNOSUPPORT WSAESOCKTNOSUPPORT +# undef EOPNOTSUPP +# define EOPNOTSUPP WSAEOPNOTSUPP +# undef EPFNOSUPPORT +# define EPFNOSUPPORT WSAEPFNOSUPPORT +# undef EAFNOSUPPORT +# define EAFNOSUPPORT WSAEAFNOSUPPORT +# undef EADDRINUSE +# define EADDRINUSE WSAEADDRINUSE +# undef EADDRNOTAVAIL +# define EADDRNOTAVAIL WSAEADDRNOTAVAIL +# undef ENETDOWN +# define ENETDOWN WSAENETDOWN +# undef ENETUNREACH +# define ENETUNREACH WSAENETUNREACH +# undef ENETRESET +# define ENETRESET WSAENETRESET +# undef ECONNABORTED +# define ECONNABORTED WSAECONNABORTED +# undef ECONNRESET +# define ECONNRESET WSAECONNRESET +# undef ENOBUFS +# define ENOBUFS WSAENOBUFS +# undef EISCONN +# define EISCONN WSAEISCONN +# undef ENOTCONN +# define ENOTCONN WSAENOTCONN +# undef ESHUTDOWN +# define ESHUTDOWN WSAESHUTDOWN +# undef ETOOMANYREFS +# define ETOOMANYREFS WSAETOOMANYREFS +# undef ETIMEDOUT +# define ETIMEDOUT WSAETIMEDOUT +# undef ECONNREFUSED +# define ECONNREFUSED WSAECONNREFUSED +# undef ELOOP +# define ELOOP WSAELOOP +# undef ENAMETOOLONG +# define ENAMETOOLONG WSAENAMETOOLONG +# undef EHOSTDOWN +# define EHOSTDOWN WSAEHOSTDOWN +# undef EHOSTUNREACH +# define EHOSTUNREACH WSAEHOSTUNREACH + +/** + * parameters to shutdown (2) with Winsock2 + * http://msdn.microsoft.com/en-us/library/windows/desktop/ms740481(v=vs.85).aspx + */ +# define SHUT_RD SD_RECEIVE +# define SHUT_WR SD_SEND +# define SHUT_RDWR SD_BOTH + +typedef ULONG nfds_t; + +typedef WSABUF IOVEC; + +# define IOVEC_GET_BASE(iov) ((iov).buf) +# define IOVEC_SET_BASE(iov, b) ((iov).buf = (b)) + +# define IOVEC_GET_LEN(iov) ((iov).len) +# define IOVEC_SET_LEN(iov, l) ((iov).len = (ULONG)(l)) + +#if _WIN32_WINNT < 0x0600 +/* otherwise defined the other way around in ws2def.h */ +#define cmsghdr _WSACMSGHDR + +#undef CMSG_DATA /* wincrypt.h can byte my shiny metal #undef */ +#define CMSG_DATA WSA_CMSG_DATA +#define CMSG_LEN WSA_CMSG_LEN +#define CMSG_SPACE WSA_CMSG_SPACE + +#define CMSG_FIRSTHDR WSA_CMSG_FIRSTHDR +#define CMSG_NXTHDR WSA_CMSG_NXTHDR +#endif /* _WIN32_WINNT < 0x0600 - provide unglified CMSG names */ + +RT_C_DECLS_BEGIN +int RTWinSocketPair(int domain, int type, int protocol, SOCKET socket_vector[2]); +RT_C_DECLS_END + +# else /* !RT_OS_WINDOWS */ + +# include <errno.h> +# include <unistd.h> + +# define SOCKET int +# define INVALID_SOCKET (-1) +# define SOCKET_ERROR (-1) + +# define SOCKERRNO() (errno) +# define SET_SOCKERRNO(error) do { errno = (error); } while (0) + +# define closesocket(s) close(s) +# define ioctlsocket(s, req, arg) ioctl((s), (req), (arg)) + +typedef struct iovec IOVEC; + +# define IOVEC_GET_BASE(iov) ((iov).iov_base) +# define IOVEC_SET_BASE(iov, b) ((iov).iov_base = (b)) + +# define IOVEC_GET_LEN(iov) ((iov).iov_len) +# define IOVEC_SET_LEN(iov, l) ((iov).iov_len = (l)) +# endif + +DECLINLINE(int) +proxy_error_is_transient(int error) +{ +# if !defined(RT_OS_WINDOWS) + return error == EWOULDBLOCK +# if EAGAIN != EWOULDBLOCK + || error == EAGAIN +# endif + || error == EINTR + || error == ENOBUFS + || error == ENOMEM; +# else + return error == WSAEWOULDBLOCK + || error == WSAEINTR /* NB: we don't redefine EINTR above */ + || error == WSAENOBUFS; +# endif +} + +#endif /* !VBOX_INCLUDED_SRC_NAT_winutils_h */ |