1 files changed, 50 insertions, 0 deletions
diff --git a/cmake/modules/Findnl.cmake b/cmake/modules/Findnl.cmake
new file mode 100644
index 000000000..1fd2fcda6
--- /dev/null
+++ b/cmake/modules/Findnl.cmake
@@ -0,0 +1,50 @@
+# - Find libnl
+# Find the libnl-3 library and includes
+#
+# nl_INCLUDE_DIR - where to find netlink.h, etc.
+# nl_<COMPONENT>_LIBRARY - library when using nl::<COMPONENT>.
+# nl_FOUND - True if nl found.
+
+find_path(nl_INCLUDE_DIR
+  NAMES
+    netlink/netlink.h
+  PATH_SUFFIXES
+    libnl3)
+
+foreach(component "core" ${nl_FIND_COMPONENTS})
+  set(nl_COMPONENTS core cli genl idiag nf route xfrm)
+  list(FIND nl_COMPONENTS "${component}" found)
+  if(found EQUAL -1)
+    message(FATAL_ERROR "unknown libnl-3 component: ${component}")
+  endif()
+  if(component STREQUAL "core")
+    find_library(nl_${component}_LIBRARY nl-3)
+  else()
+    find_library(nl_${component}_LIBRARY nl-${component}-3)
+  endif()
+  list(APPEND nl_LIBRARIES "nl_${component}_LIBRARY")
+endforeach()
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(nl
+  DEFAULT_MSG ${nl_LIBRARIES} nl_INCLUDE_DIR)
+
+mark_as_advanced(
+  ${nl_LIBRARIES}
+  nl_INCLUDE_DIR)
+
+if(nl_FOUND)
+  foreach(component "core" ${nl_FIND_COMPONENTS})
+    if(NOT TARGET nl::${component})
+      add_library(nl::${component} UNKNOWN IMPORTED)
+      set_target_properties(nl::${component} PROPERTIES
+        INTERFACE_INCLUDE_DIRECTORIES "${nl_INCLUDE_DIR}"
+        IMPORTED_LINK_INTERFACE_LANGUAGES "C"
+        IMPORTED_LOCATION "${nl_${component}_LIBRARY}")
+      if(NOT component STREQUAL "core")
+        set_target_properties(nl::${component} PROPERTIES
+          INTERFACE_LINK_LIBRARIES "${nl_core_LIBRARY}")
+      endif()
+    endif()
+  endforeach()
+endif()