bgpd: EVPN route handling

Core EVPN route handling functionality. This includes support for the
following:
- interface with zebra to learn about local VNIs and MACIPs as well as
to install remote VTEPs (per VNI) and remote MACIPs
- create/update/delete EVPN type-2 and type-3 routes
- attribute creation, route selection and install
- route handling per VNI and for the global routing table
- parsing of received EVPN routes and handling by route type
- encoding attributes for EVPN routes and EVPN prefix creation (for
Updates)

Signed-off-by: Vivek Venkatraman <vivek@cumulusnetworks.com>
Reviewed-by:   Donald Sharp <sharpd@cumulusnetworks.com>
Reviewed-by:   Daniel Walton <dwalton@cumulusnetworks.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/bgpd/bgp_updgrp_packet.c b/bgpd/bgp_updgrp_packet.c
index cecb844fc..872ead000 100644
--- a/bgpd/bgp_updgrp_packet.c
+++ b/bgpd/bgp_updgrp_packet.c
@@ -607,6 +607,30 @@ bpacket_reformat_for_peer (struct bpacket *pkt, struct peer_af *paf)
                             (nhlen == 24 ? " and RD" : ""));
             }
 	}
+      else if (paf->afi == AFI_L2VPN)
+        {
+          struct in_addr v4nh, *mod_v4nh;
+          int nh_modified = 0;
+
+          stream_get_from (&v4nh, s, vec->offset + 1, 4);
+          mod_v4nh = &v4nh;
+
+          /* No route-map changes allowed for EVPN nexthops. */
+          if (!v4nh.s_addr)
+            {
+               mod_v4nh = &peer->nexthop.v4;
+               nh_modified = 1;
+            }
+
+          if (nh_modified)
+            stream_put_in_addr_at (s, vec->offset + 1, mod_v4nh);
+
+          if (bgp_debug_update(peer, NULL, NULL, 0))
+            zlog_debug ("u%" PRIu64 ":s%" PRIu64 " %s send UPDATE w/ nexthop %s",
+                    PAF_SUBGRP(paf)->update_group->id, PAF_SUBGRP(paf)->id,
+                    peer->host, inet_ntoa (*mod_v4nh));
+
+        }
     }
 
   bgp_packet_add (peer, s);