$OpenBSD: patch-socket_c,v 1.3 2010/08/30 18:32:20 fkr Exp $
--- socket.c.orig	Mon Jul 26 08:15:03 2010
+++ socket.c	Sun Aug 22 16:13:58 2010
@@ -533,6 +533,20 @@ socket_set_tcp_nodelay (int sd, int state)
 #endif
 }
 
+static void
+socket_set_rtable (int sd, int rtable)
+{
+#ifdef TARGET_OPENBSD
+  if (rtable > 0)
+  {
+    if (setsockopt (sd, IPPROTO_IP, SO_RTABLE, &rtable, sizeof(rtable)) == -1)
+      msg (M_SOCKERR, "Socket flags: SO_RTABLE=%d failed, cannot bind on specified routing domain", rtable);
+    else
+      dmsg (D_SOCKET_DEBUG, "Socket flags: SO_RTABLE=%d succeeded", rtable);
+  }
+#endif
+}
+
 static bool
 socket_set_flags (int sd, unsigned int sockflags)
 {
@@ -1211,6 +1225,7 @@ link_socket_init_phase1 (struct link_socket *sock,
 			 int mtu_discover_type,
 			 int rcvbuf,
 			 int sndbuf,
+			 int rtable,
 			 unsigned int sockflags)
 {
   ASSERT (sock);
@@ -1321,6 +1336,9 @@ link_socket_init_phase1 (struct link_socket *sock,
   else if (mode != LS_MODE_TCP_ACCEPT_FROM)
     {
       create_socket (sock);
+
+      /* set the routing domain for the socket */
+      socket_set_rtable (sock->sd, rtable);
 
       /* set socket buffers based on --sndbuf and --rcvbuf options */
       socket_set_buffers (sock->sd, &sock->socket_buffer_sizes);