From 00a09f3c367e79297f827b52ec5f16842db1ac4e Mon Sep 17 00:00:00 2001
From: Ondrej Zajicek <santiago@crfreenet.org>
Date: Sun, 15 Apr 2012 15:07:58 +0200
Subject: Implement RA_ACCEPTED mode of route propagation.

---
 proto/bgp/bgp.c    |  7 +++++--
 proto/bgp/bgp.h    |  1 +
 proto/bgp/config.Y | 10 +++++++++-
 3 files changed, 15 insertions(+), 3 deletions(-)

(limited to 'proto/bgp')

diff --git a/proto/bgp/bgp.c b/proto/bgp/bgp.c
index 4dd4b7be..099a39a9 100644
--- a/proto/bgp/bgp.c
+++ b/proto/bgp/bgp.c
@@ -909,7 +909,7 @@ bgp_init(struct proto_config *C)
   struct proto *P = proto_new(C, sizeof(struct bgp_proto));
   struct bgp_proto *p = (struct bgp_proto *) P;
 
-  P->accept_ra_types = RA_OPTIMAL;
+  P->accept_ra_types = c->secondary ? RA_ACCEPTED : RA_OPTIMAL;
   P->rt_notify = bgp_rt_notify;
   P->rte_better = bgp_rte_better;
   P->import_control = bgp_import_control;
@@ -955,12 +955,14 @@ bgp_check_config(struct bgp_config *c)
   if (internal && c->rs_client)
     cf_error("Only external neighbor can be RS client");
 
+  /*
   if (c->multihop && (c->gw_mode == GW_DIRECT))
     cf_error("Multihop BGP cannot use direct gateway mode");
 
   if (c->multihop && (ipa_has_link_scope(c->remote_ip) || 
 		      ipa_has_link_scope(c->source_addr)))
     cf_error("Multihop BGP cannot be used with link-local addresses");
+  */
 
   /* Different default based on rs_client */
   if (!c->missing_lladdr)
@@ -968,7 +970,8 @@ bgp_check_config(struct bgp_config *c)
 
   /* Different default for gw_mode */
   if (!c->gw_mode)
-    c->gw_mode = (c->multihop || internal) ? GW_RECURSIVE : GW_DIRECT;
+    // c->gw_mode = (c->multihop || internal) ? GW_RECURSIVE : GW_DIRECT;
+    c->gw_mode = GW_DIRECT;
 }
 
 static int
diff --git a/proto/bgp/bgp.h b/proto/bgp/bgp.h
index a8c5818e..87734425 100644
--- a/proto/bgp/bgp.h
+++ b/proto/bgp/bgp.h
@@ -43,6 +43,7 @@ struct bgp_config {
   u32 route_limit;			/* Number of routes that may be imported, 0 means disable limit */
   int passive;				/* Do not initiate outgoing connection */
   int interpret_communities;		/* Hardwired handling of well-known communities */
+  int secondary;			/* Accept also non-best routes (i.e. RA_ACCEPTED) */
   unsigned connect_retry_time;
   unsigned hold_time, initial_hold_time;
   unsigned keepalive_time;
diff --git a/proto/bgp/config.Y b/proto/bgp/config.Y
index 78ca52de..356415a2 100644
--- a/proto/bgp/config.Y
+++ b/proto/bgp/config.Y
@@ -25,7 +25,8 @@ CF_KEYWORDS(BGP, LOCAL, NEIGHBOR, AS, HOLD, TIME, CONNECT, RETRY,
 	CLUSTER, ID, AS4, ADVERTISE, IPV4, CAPABILITIES, LIMIT, PASSIVE,
 	PREFER, OLDER, MISSING, LLADDR, DROP, IGNORE, ROUTE, REFRESH,
 	INTERPRET, COMMUNITIES, BGP_ORIGINATOR_ID, BGP_CLUSTER_LIST, IGP,
-	TABLE, GATEWAY, DIRECT, RECURSIVE, MED, TTL, SECURITY, DETERMINISTIC)
+	TABLE, GATEWAY, DIRECT, RECURSIVE, MED, TTL, SECURITY, DETERMINISTIC,
+	SECONDARY)
 
 CF_GRAMMAR
 
@@ -73,19 +74,25 @@ bgp_proto:
  | bgp_proto STARTUP HOLD TIME expr ';' { BGP_CFG->initial_hold_time = $5; }
  | bgp_proto CONNECT RETRY TIME expr ';' { BGP_CFG->connect_retry_time = $5; }
  | bgp_proto KEEPALIVE TIME expr ';' { BGP_CFG->keepalive_time = $4; }
+/*
  | bgp_proto MULTIHOP ';' { BGP_CFG->multihop = 64; }
  | bgp_proto MULTIHOP expr ';' { BGP_CFG->multihop = $3; if (($3<1) || ($3>255)) cf_error("Multihop must be in range 1-255"); }
+*/
  | bgp_proto NEXT HOP SELF ';' { BGP_CFG->next_hop_self = 1; }
  | bgp_proto MISSING LLADDR SELF ';' { BGP_CFG->missing_lladdr = MLL_SELF; }
  | bgp_proto MISSING LLADDR DROP ';' { BGP_CFG->missing_lladdr = MLL_DROP; }
  | bgp_proto MISSING LLADDR IGNORE ';' { BGP_CFG->missing_lladdr = MLL_IGNORE; }
+/*
  | bgp_proto GATEWAY DIRECT ';' { BGP_CFG->gw_mode = GW_DIRECT; }
  | bgp_proto GATEWAY RECURSIVE ';' { BGP_CFG->gw_mode = GW_RECURSIVE; }
+*/
  | bgp_proto PATH METRIC bool ';' { BGP_CFG->compare_path_lengths = $4; }
  | bgp_proto MED METRIC bool ';' { BGP_CFG->med_metric = $4; }
  | bgp_proto IGP METRIC bool ';' { BGP_CFG->igp_metric = $4; }
  | bgp_proto PREFER OLDER bool ';' { BGP_CFG->prefer_older = $4; }
+/*
  | bgp_proto DETERMINISTIC MED bool ';' { BGP_CFG->deterministic_med = $4; }
+*/
  | bgp_proto DEFAULT BGP_MED expr ';' { BGP_CFG->default_med = $4; }
  | bgp_proto DEFAULT BGP_LOCAL_PREF expr ';' { BGP_CFG->default_local_pref = $4; }
  | bgp_proto SOURCE ADDRESS ipa ';' { BGP_CFG->source_addr = $4; }
@@ -101,6 +108,7 @@ bgp_proto:
  | bgp_proto ROUTE LIMIT expr ';' { BGP_CFG->route_limit = $4; }
  | bgp_proto PASSIVE bool ';' { BGP_CFG->passive = $3; }
  | bgp_proto INTERPRET COMMUNITIES bool ';' { BGP_CFG->interpret_communities = $4; }
+ | bgp_proto SECONDARY bool ';' { BGP_CFG->secondary = $3; }
  | bgp_proto IGP TABLE rtable ';' { BGP_CFG->igp_table = $4; }
  | bgp_proto TTL SECURITY bool ';' { BGP_CFG->ttl_security = $4; }
  ;
-- 
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