Implements BGP route refresh.

4 files changed, 83 insertions, 1 deletions

diff --git a/proto/bgp/bgp.c b/proto/bgp/bgp.c
index cde0276..24cd202 100644
--- a/proto/bgp/bgp.c
+++ b/proto/bgp/bgp.c
@@ -676,6 +676,17 @@ bgp_neigh_notify(neighbor *n)
     }
 }
 
+static int
+bgp_reload_routes(struct proto *P)
+{
+  struct bgp_proto *p = (struct bgp_proto *) P;
+  if (!p->conn || !p->conn->peer_refresh_support)
+    return 0;
+
+  bgp_schedule_packet(p->conn, PKT_ROUTE_REFRESH);
+  return 1;
+}
+
 static void
 bgp_start_locked(struct object_lock *lock)
 {
@@ -792,6 +803,7 @@ bgp_init(struct proto_config *C)
   P->rte_better = bgp_rte_better;
   P->import_control = bgp_import_control;
   P->neigh_notify = bgp_neigh_notify;
+  P->reload_routes = bgp_reload_routes;
   p->cf = c;
   p->local_as = c->local_as;
   p->remote_as = c->remote_as;
diff --git a/proto/bgp/bgp.h b/proto/bgp/bgp.h
index c4d0335..59ec9c1 100644
--- a/proto/bgp/bgp.h
+++ b/proto/bgp/bgp.h
@@ -29,6 +29,7 @@ struct bgp_config {
   u32 default_local_pref;		/* Default value for LOCAL_PREF attribute */
   u32 default_med;			/* Default value for MULTI_EXIT_DISC attribute */
   int capabilities;			/* Enable capability handshake [RFC3392] */
+  int enable_refresh;			/* Enable local support for route refresh [RFC2918] */
   int enable_as4;			/* Enable local support for 4B AS numbers [RFC4893] */
   u32 rr_cluster_id;			/* Route reflector cluster ID, if different from local ID */
   int rr_client;			/* Whether neighbor is RR client of me */
@@ -66,6 +67,7 @@ struct bgp_conn {
   int start_state;			/* protocol start_state snapshot when connection established */
   int want_as4_support;			/* Connection tries to establish AS4 session */
   int peer_as4_support;			/* Peer supports 4B AS numbers [RFC4893] */
+  int peer_refresh_support;		/* Peer supports route refresh [RFC2918] */
   unsigned hold_time, keepalive_time;	/* Times calculated from my and neighbor's requirements */
 };
 
@@ -202,6 +204,7 @@ void bgp_log_error(struct bgp_proto *p, u8 class, char *msg, unsigned code, unsi
 #define PKT_UPDATE		0x02
 #define PKT_NOTIFICATION	0x03
 #define PKT_KEEPALIVE		0x04
+#define PKT_ROUTE_REFRESH	0x05
 #define PKT_SCHEDULE_CLOSE	0x1f	/* Used internally to schedule socket close */
 
 /* Attributes */
diff --git a/proto/bgp/config.Y b/proto/bgp/config.Y
index 3576946..3c73d60 100644
--- a/proto/bgp/config.Y
+++ b/proto/bgp/config.Y
@@ -23,7 +23,7 @@ CF_KEYWORDS(BGP, LOCAL, NEIGHBOR, AS, HOLD, TIME, CONNECT, RETRY, KEEPALIVE,
 	BGP_ATOMIC_AGGR, BGP_AGGREGATOR, BGP_COMMUNITY, SOURCE, ADDRESS,
 	PASSWORD, RR, RS, CLIENT, CLUSTER, ID, AS4, ADVERTISE, IPV4,
 	CAPABILITIES, LIMIT, PASSIVE, PREFER, OLDER, MISSING, LLADDR,
-	DROP, IGNORE)
+	DROP, IGNORE, ROUTE, REFRESH)
 
 CF_GRAMMAR
 
@@ -40,6 +40,7 @@ bgp_proto_start: proto_start BGP {
      BGP_CFG->error_amnesia_time = 300;
      BGP_CFG->error_delay_time_min = 60;
      BGP_CFG->error_delay_time_max = 300;
+     BGP_CFG->enable_refresh = 1;
      BGP_CFG->enable_as4 = bgp_as4_support;
      BGP_CFG->capabilities = 2;
      BGP_CFG->advertise_ipv4 = 1;
@@ -77,6 +78,7 @@ bgp_proto:
  | bgp_proto ERROR FORGET TIME expr ';' { BGP_CFG->error_amnesia_time = $5; } 
  | bgp_proto ERROR WAIT TIME expr ',' expr ';' { BGP_CFG->error_delay_time_min = $5; BGP_CFG->error_delay_time_max = $7; }
  | bgp_proto DISABLE AFTER ERROR bool ';' { BGP_CFG->disable_after_error = $5; }
+ | bgp_proto ENABLE ROUTE REFRESH bool ';' { BGP_CFG->enable_refresh = $5; }
  | bgp_proto ENABLE AS4 bool ';' { BGP_CFG->enable_as4 = $4; }
  | bgp_proto CAPABILITIES bool ';' { BGP_CFG->capabilities = $3; }
  | bgp_proto ADVERTISE IPV4 bool ';' { BGP_CFG->advertise_ipv4 = $4; }
diff --git a/proto/bgp/packets.c b/proto/bgp/packets.c
index 4176c9f..91b4792 100644
--- a/proto/bgp/packets.c
+++ b/proto/bgp/packets.c
@@ -64,6 +64,14 @@ bgp_put_cap_ipv4(struct bgp_conn *conn UNUSED, byte *buf)
 #endif
 
 static byte *
+bgp_put_cap_rr(struct bgp_conn *conn UNUSED, byte *buf)
+{
+  *buf++ = 2;		/* Capability 2: Support for route refresh */
+  *buf++ = 0;		/* Capability data length */
+  return buf;
+}
+
+static byte *
 bgp_put_cap_as4(struct bgp_conn *conn, byte *buf)
 {
   *buf++ = 65;		/* Capability 65: Support for 4-octet AS number */
@@ -105,6 +113,9 @@ bgp_create_open(struct bgp_conn *conn, byte *buf)
   cap = bgp_put_cap_ipv6(conn, cap);
 #endif
 
+  if (p->cf->enable_refresh)
+    cap = bgp_put_cap_rr(conn, cap);
+
   if (conn->want_as4_support)
     cap = bgp_put_cap_as4(conn, cap);
 
@@ -386,6 +397,24 @@ bgp_create_update(struct bgp_conn *conn, byte *buf)
 
 #endif
 
+static byte *
+bgp_create_route_refresh(struct bgp_conn *conn, byte *buf)
+{
+  struct bgp_proto *p = conn->bgp;
+  BGP_TRACE(D_PACKETS, "Sending ROUTE-REFRESH");
+
+#ifdef IPV6
+  *buf++ = 0;		/* AFI IPv6 */
+  *buf++ = BGP_AF_IPV6;
+#else
+  *buf++ = 0;		/* AFI IPv4 */
+  *buf++ = BGP_AF_IPV4;
+#endif
+  *buf++ = 0;		/* RFU */
+  *buf++ = 1;		/* and SAFI 1 */
+  return buf;
+}
+
 static void
 bgp_create_header(byte *buf, unsigned int len, unsigned int type)
 {
@@ -447,6 +476,12 @@ bgp_fire_tx(struct bgp_conn *conn)
       type = PKT_OPEN;
       end = bgp_create_open(conn, pkt);
     }
+  else if (s & (1 << PKT_ROUTE_REFRESH))
+    {
+      s &= ~(1 << PKT_ROUTE_REFRESH);
+      type = PKT_ROUTE_REFRESH;
+      end = bgp_create_route_refresh(conn, pkt);
+    }
   else if (s & (1 << PKT_UPDATE))
     {
       end = bgp_create_update(conn, pkt);
@@ -517,6 +552,11 @@ bgp_parse_capabilities(struct bgp_conn *conn, byte *opt, int len)
 
       switch (opt[0])
 	{
+	case 2:
+	  if (cl != 0)
+	    goto err;
+	  conn->peer_refresh_support = 1;
+	  break;
 	case 65:
 	  if (cl != 4)
 	    goto err;
@@ -1084,6 +1124,30 @@ bgp_rx_keepalive(struct bgp_conn *conn)
     }
 }
 
+static void
+bgp_rx_route_refresh(struct bgp_conn *conn, byte *pkt, int len)
+{
+  struct bgp_proto *p = conn->bgp;
+
+  BGP_TRACE(D_PACKETS, "Got ROUTE-REFRESH");
+
+  if (conn->state != BS_ESTABLISHED)
+    { bgp_error(conn, 5, 0, NULL, 0); return; }
+
+  if (!p->cf->enable_refresh)
+    { bgp_error(conn, 1, 3, pkt+18, 1); return; }
+
+  if (len != (BGP_HEADER_LENGTH + 4))
+    { bgp_error(conn, 1, 2, pkt+16, 2); return; }
+
+  /* FIXME - we ignore AFI/SAFI values, as we support
+     just one value and even an error code for an invalid
+     request is not defined */
+
+  proto_request_feeding(&p->p);
+}
+
+
 /**
  * bgp_rx_packet - handle a received packet
  * @conn: BGP connection
@@ -1103,6 +1167,7 @@ bgp_rx_packet(struct bgp_conn *conn, byte *pkt, unsigned len)
     case PKT_UPDATE:		return bgp_rx_update(conn, pkt, len);
     case PKT_NOTIFICATION:      return bgp_rx_notification(conn, pkt, len);
     case PKT_KEEPALIVE:		return bgp_rx_keepalive(conn);
+    case PKT_ROUTE_REFRESH:	return bgp_rx_route_refresh(conn, pkt, len);
     default:			bgp_error(conn, 1, 3, pkt+18, 1);
     }
 }