Fixed seladb#1635 xsk.h should be taken from libxdp

CMakeLists.txt

@@ -235,6 +235,10 @@ if(PCAPPP_USE_XDP)
   if(NOT BPF_FOUND)
     message(FATAL_ERROR "libbpf not found!")
   endif()
+  find_package(XDP)
+  if(NOT XDP_FOUND)
+    message(FATAL_ERROR "libxdp not found!")
+  endif()
   add_definitions(-DUSE_XDP)
 endif()
 

Pcap++/CMakeLists.txt

@@ -89,6 +89,7 @@ target_link_libraries(
     $<$<BOOL:${PCAPPP_USE_PF_RING}>:PF_RING::PF_RING>
     $<$<BOOL:${PCAPPP_USE_DPDK}>:DPDK::DPDK>
     $<$<BOOL:${PCAPPP_USE_XDP}>:BPF::BPF>
+    $<$<BOOL:${PCAPPP_USE_XDP}>:XDP::XDP>
     PCAP::PCAP
     Threads::Threads
 )

Pcap++/src/XdpDevice.cpp

@@ -5,7 +5,7 @@
 #include "Logger.h"
 #include "Packet.h"
 #include <bpf/libbpf.h>
-#include <bpf/xsk.h>
+#include <xdp/xsk.h>
 #include <linux/if_link.h>
 #include <net/if.h>
 #include <sys/mman.h>

cmake/modules/FindXDP.cmake

@@ -0,0 +1,34 @@
+# ~~~
+# - Try to find libxdp
+#
+# Once done this will define
+#
+#  XDP_FOUND        - System has libxdp
+#  XDP_INCLUDE_DIRS - The libxdp include directories
+#  XDP_LIBRARIES    - The libraries needed to use libxdp
+# ~~~
+
+find_package(PkgConfig QUIET)
+pkg_check_modules(PC_LIBBPF libxdp)
+
+find_path(
+  XDP_INCLUDE_DIRS
+  NAMES xdp/xsk.h
+  HINTS ${PC_LIBXDP_INCLUDE_DIRS})
+
+find_library(
+  XDP
+  NAMES xdp
+  HINTS ${PC_LIBXDP_LIBRARY_DIRS})
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(
+  XDP
+  REQUIRED_VARS XDP XDP_INCLUDE_DIRS
+  VERSION_VAR XDP_VERSION
+  FAIL_MESSAGE "libxdp not found!")
+
+if(XDP_FOUND AND NOT TARGET XDP::XDP)
+  add_library(XDP::XDP INTERFACE IMPORTED)
+  set_target_properties(XDP::XDP PROPERTIES INTERFACE_LINK_LIBRARIES "${XDP_LIBRARIES}" INTERFACE_INCLUDE_DIRECTORIES "${XDP_INCLUDE_DIRS}")
+endif()