From a244c5524b30874e24fc4dfbdb8cef243bd33178 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Wed, 3 Nov 2010 01:40:36 +0100
Subject: Added support for sending and handling the multicast capability

---
 proto/bgp/packets.c | 42 ++++++++++++++++++++++++++++++++++--------
 1 file changed, 34 insertions(+), 8 deletions(-)

(limited to 'proto/bgp/packets.c')

diff --git a/proto/bgp/packets.c b/proto/bgp/packets.c
index bf98640..1a1e7b7 100644
--- a/proto/bgp/packets.c
+++ b/proto/bgp/packets.c
@@ -117,12 +117,12 @@ bgp_create_notification(struct bgp_conn *conn, byte *buf)
 static byte *
 bgp_put_cap_ipv6(struct bgp_conn *conn UNUSED, byte *buf)
 {
-  *buf++ = 1;		/* Capability 1: Multiprotocol extensions */
+  *buf++ = BGP_CAP_MP;		/* Capability 1: Multiprotocol extensions */
   *buf++ = 4;		/* Capability data length */
   *buf++ = 0;		/* We support AF IPv6 */
   *buf++ = BGP_AF_IPV6;
   *buf++ = 0;		/* RFU */
-  *buf++ = 1;		/* and SAFI 1 */
+  *buf++ = BGP_SAF_UNICAST;		/* and SAFI 1 */
   return buf;
 }
 
@@ -131,20 +131,32 @@ bgp_put_cap_ipv6(struct bgp_conn *conn UNUSED, byte *buf)
 static byte *
 bgp_put_cap_ipv4(struct bgp_conn *conn UNUSED, byte *buf)
 {
-  *buf++ = 1;		/* Capability 1: Multiprotocol extensions */
+  *buf++ = BGP_CAP_MP;		/* Capability 1: Multiprotocol extensions */
   *buf++ = 4;		/* Capability data length */
   *buf++ = 0;		/* We support AF IPv4 */
   *buf++ = BGP_AF_IPV4;
   *buf++ = 0;		/* RFU */
-  *buf++ = 1;		/* and SAFI 1 */
+  *buf++ = BGP_SAF_UNICAST;		/* and SAFI 1 */
   return buf;
 }
 #endif
 
+static byte *
+bgp_put_cap_multicast(struct bgp_conn *conn UNUSED, byte *buf)
+{
+  *buf++ = BGP_CAP_MP;		/* Capability 1: Multiprotocol extensions */
+  *buf++ = 4;		/* Capability data length */
+  *buf++ = 0;
+  *buf++ = BGP_AF;
+  *buf++ = 0;		/* RFU */
+  *buf++ = BGP_SAF_MULTICAST;		/* and SAFI 2 */
+  return buf;
+}
+
 static byte *
 bgp_put_cap_rr(struct bgp_conn *conn UNUSED, byte *buf)
 {
-  *buf++ = 2;		/* Capability 2: Support for route refresh */
+  *buf++ = BGP_CAP_REFRESH;		/* Capability 2: Support for route refresh */
   *buf++ = 0;		/* Capability data length */
   return buf;
 }
@@ -152,7 +164,7 @@ bgp_put_cap_rr(struct bgp_conn *conn UNUSED, byte *buf)
 static byte *
 bgp_put_cap_as4(struct bgp_conn *conn, byte *buf)
 {
-  *buf++ = 65;		/* Capability 65: Support for 4-octet AS number */
+  *buf++ = BGP_CAP_AS4;		/* Capability 65: Support for 4-octet AS number */
   *buf++ = 4;		/* Capability data length */
   put_u32(buf, conn->bgp->local_as);
   return buf + 4;
@@ -197,6 +209,9 @@ bgp_create_open(struct bgp_conn *conn, byte *buf)
   if (conn->want_as4_support)
     cap = bgp_put_cap_as4(conn, cap);
 
+  if (conn->want_multicast_support)
+    cap = bgp_put_cap_multicast(conn, cap);
+
   cap_len = cap - buf - 12;
   if (cap_len > 0)
     {
@@ -625,13 +640,24 @@ bgp_parse_capabilities(struct bgp_conn *conn, byte *opt, int len)
 
       switch (opt[0])
 	{
-	case 2:	/* Route refresh capability, RFC 2918 */
+	case BGP_CAP_MP:	/* Multiprotocol capability, RFC 4760 */
+	  if (cl != 4)
+	    goto err;
+	  
+	  if (get_u16(opt + 2) != BGP_AF)
+	    break;
+
+	  if (opt[5] == BGP_SAF_MULTICAST)
+	    conn->peer_multicast_support = 1;
+	  break;
+
+	case BGP_CAP_REFRESH:	/* Route refresh capability, RFC 2918 */
 	  if (cl != 0)
 	    goto err;
 	  conn->peer_refresh_support = 1;
 	  break;
 
-	case 65: /* AS4 capability, RFC 4893 */ 
+	case BGP_CAP_AS4: /* AS4 capability, RFC 4893 */ 
 	  if (cl != 4)
 	    goto err;
 	  conn->peer_as4_support = 1;
-- 
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