From 8e63db05f5fc41c53382c5203d81ab6dad010232 Mon Sep 17 00:00:00 2001
From: Alexander Chernikov <melifaro@FreeBSD.org>
Date: Tue, 13 Sep 2022 12:08:58 +0000
Subject: [PATCH 1/1] FreeBSD: add netlink support

Netlink can be enabled by picking new sysconfig target:
./configure --with-sysconfig=bsd-netlink
---
 sysdep/bsd-netlink/Makefile |  6 ++++++
 sysdep/cf/bsd-netlink.h     | 34 ++++++++++++++++++++++++++++++++++
 sysdep/cf/linux.h           |  2 ++
 sysdep/linux/netlink.c      |  7 ++++++-
 4 files changed, 48 insertions(+), 1 deletion(-)
 create mode 100644 sysdep/bsd-netlink/Makefile
 create mode 100644 sysdep/cf/bsd-netlink.h

diff --git a/sysdep/bsd-netlink/Makefile b/sysdep/bsd-netlink/Makefile
new file mode 100644
index 00000000..b34cb9cc
--- /dev/null
+++ b/sysdep/bsd-netlink/Makefile
@@ -0,0 +1,6 @@
+src := ../linux/netlink.c
+obj := $(src-o-files)
+$(all-daemon)
+$(conf-y-targets): $(s)../linux/netlink.Y
+
+tests_objs := $(tests_objs) $(src-o-files)
diff --git a/sysdep/cf/bsd-netlink.h b/sysdep/cf/bsd-netlink.h
new file mode 100644
index 00000000..09149dc4
--- /dev/null
+++ b/sysdep/cf/bsd-netlink.h
@@ -0,0 +1,34 @@
+/*
+ *	Configuration for FreeBSD based systems with netlink support
+ *
+ *	(c) 2022 Alexander Chernikov <melifaro@FreeBSD.org>
+ *
+ *	Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#define CONFIG_AUTO_ROUTES
+#define CONFIG_SELF_CONSCIOUS
+#define CONFIG_MULTIPLE_TABLES
+#define CONFIG_SINGLE_ROUTE
+
+#define CONFIG_SKIP_MC_BIND
+#define CONFIG_NO_IFACE_BIND
+#define CONFIG_USE_HDRINCL
+
+#define CONFIG_INCLUDE_SYSIO_H "sysdep/bsd/sysio.h"
+#define CONFIG_INCLUDE_KRTSYS_H "sysdep/linux/krt-sys.h"
+
+#define	CONFIG_FREEBSD_NETLINK
+
+#ifndef	AF_MPLS
+#define	AF_MPLS	39
+#endif
+
+#ifndef	SO_RCVBUFFORCE
+#define	SO_RCVBUFFORCE	SO_RCVBUF
+#endif
+
+/*
+Link: sysdep/unix
+Link: sysdep/bsd-netlink
+ */
diff --git a/sysdep/cf/linux.h b/sysdep/cf/linux.h
index 56ecf017..334dd749 100644
--- a/sysdep/cf/linux.h
+++ b/sysdep/cf/linux.h
@@ -17,6 +17,8 @@
 #define CONFIG_INCLUDE_SYSIO_H "sysdep/linux/sysio.h"
 #define CONFIG_INCLUDE_KRTSYS_H "sysdep/linux/krt-sys.h"
 
+#define	CONFIG_LINUX_NETLINK
+
 #define CONFIG_RESTRICTED_PRIVILEGES
 #define CONFIG_INCLUDE_SYSPRIV_H "sysdep/linux/syspriv.h"
 
diff --git a/sysdep/linux/netlink.c b/sysdep/linux/netlink.c
index d9e81c10..dcb25911 100644
--- a/sysdep/linux/netlink.c
+++ b/sysdep/linux/netlink.c
@@ -6,7 +6,6 @@
  *	Can be freely distributed and used under the terms of the GNU GPL.
  */
 
-#include <alloca.h>
 #include <stdio.h>
 #include <unistd.h>
 #include <fcntl.h>
@@ -28,10 +27,16 @@
 #include "lib/hash.h"
 #include "conf/conf.h"
 
+#ifdef CONFIG_LINUX_NETLINK
 #include <asm/types.h>
 #include <linux/if.h>
 #include <linux/netlink.h>
 #include <linux/rtnetlink.h>
+#endif
+#ifdef CONFIG_FREEBSD_NETLINK
+#include <netlink/netlink.h>
+#include <netlink/netlink_route.h>
+#endif
 
 #ifdef HAVE_MPLS_KERNEL
 #include <linux/lwtunnel.h>
-- 
2.37.1