bgpd: evpn NLRI route type 5 forging

This patch introduces the ability to make route type 5 message
when EVPN is enabled. Picked up paramters are collected from the
bgp extra attribute structure and are the ESI, the ethernet tag
information. In addition to this, nexthop attribute is collected too.

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>

1 files changed, 51 insertions, 0 deletions

diff --git a/bgpd/bgp_evpn.c b/bgpd/bgp_evpn.c
index fd785b9a6..a9db7d236 100644
--- a/bgpd/bgp_evpn.c
+++ b/bgpd/bgp_evpn.c
@@ -187,3 +187,54 @@ bgp_nlri_parse_evpn (struct peer *peer, struct attr *attr,
 
   return 0;
 }
+
+void
+bgp_packet_mpattr_route_type_5 (struct stream *s,
+                                struct prefix *p, struct prefix_rd *prd,
+                                u_char *label, struct attr *attr)
+{
+  int len;
+  char temp[16];
+  struct evpn_addr *p_evpn_p;
+
+  memset(&temp, 0, 16);
+  if(p->family != AF_ETHERNET)
+    return;
+  p_evpn_p = &(p->u.prefix_evpn);
+  if (p_evpn_p->flags & IP_PREFIX_V4)
+    len = 8; /* ipv4 */
+  else
+    len = 32; /* ipv6 */
+  stream_putc (s, EVPN_IP_PREFIX);
+  stream_putc (s, 8 /* RD */ + 10 /* ESI */  + 4 /* EthTag */ + 1 + len + 3 /* label */);
+  stream_put (s, prd->val, 8);
+  if(attr && attr->extra)
+    stream_put (s, &(attr->extra->evpn_overlay.eth_s_id), 10);
+  else
+    stream_put (s, &temp, 10);
+  stream_putl (s, p_evpn_p->eth_tag);
+  stream_putc (s, p_evpn_p->ip_prefix_length);
+  if (p_evpn_p->flags & IP_PREFIX_V4)
+    stream_put_ipv4(s, p_evpn_p->ip.v4_addr.s_addr);
+  else
+    stream_put(s, &p_evpn_p->ip.v6_addr, 16);
+  if(attr && attr->extra)
+    {
+      if (p_evpn_p->flags & IP_PREFIX_V4)
+        stream_put_ipv4(s, attr->extra->evpn_overlay.gw_ip.ipv4.s_addr);
+      else
+        stream_put(s, &(attr->extra->evpn_overlay.gw_ip.ipv6), 16);
+    }
+  else
+    {
+      if (p_evpn_p->flags & IP_PREFIX_V4)
+        stream_put_ipv4(s, 0);
+      else
+        stream_put(s, &temp, 16);
+    }
+  if(label)
+    stream_put (s, label, 3);
+  else
+    stream_put3 (s, 0);
+  return;
+}