commit 9e7a53c179f6897128b24435452b5d3d0f8c715a
author Timo Teräs <timo.teras@iki.fi> Thu Apr 24 10:22:37 2014 +0300
committer Timo Teräs <timo.teras@iki.fi> Wed Jun 25 21:20:20 2014 +0300
tree 80a5cc6e9e6dc411587764d865a2bf5f489000ba
parent 2aa640bd78b64821bde9a53ecdd1e96e91b20ae4

bgpd: implement "next-hop-self all"

As specified in:
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/command/irg-cr-book/bgp-m1.html#wp4972925610

This allows overriding next-hop for ibgp learned routes on an
RR for reflected routes.

Especially useful for using iBGP in DMVPN setups. See:
http://blog.ipspace.net/2014/04/changes-in-ibgp-next-hop-processing.html

Signed-off-by: Timo Teräs <timo.teras@iki.fi>

bgpd/bgpd.c

diff --git a/bgpd/bgpd.c b/bgpd/bgpd.c
index 19b96fa..4d374cc 100644
--- a/bgpd/bgpd.c
+++ b/bgpd/bgpd.c
@@ -2355,6 +2355,7 @@
     { PEER_FLAG_ORF_PREFIX_SM,            1, peer_change_reset },
     { PEER_FLAG_ORF_PREFIX_RM,            1, peer_change_reset },
     { PEER_FLAG_NEXTHOP_LOCAL_UNCHANGED,  0, peer_change_reset_out },
+    { PEER_FLAG_NEXTHOP_SELF_ALL,         1, peer_change_reset_out },
     { 0, 0, 0 }
   };
 
@@ -4990,7 +4991,9 @@
   /* Nexthop self. */
   if (peer_af_flag_check (peer, afi, safi, PEER_FLAG_NEXTHOP_SELF)
       && ! peer->af_group[afi][safi])
-    vty_out (vty, " neighbor %s next-hop-self%s", addr, VTY_NEWLINE);
+    vty_out (vty, " neighbor %s next-hop-self%s%s", addr,
+	     peer_af_flag_check (peer, afi, safi, PEER_FLAG_NEXTHOP_SELF_ALL) ?
+	     " all" : "", VTY_NEWLINE);
 
   /* Remove private AS. */
   if (peer_af_flag_check (peer, afi, safi, PEER_FLAG_REMOVE_PRIVATE_AS)