From 43c1ceccb9caf8c4f63f191346c2f33889b4ad22 Mon Sep 17 00:00:00 2001
From: Ondrej Zajicek <santiago@crfreenet.org>
Date: Mon, 14 Dec 2009 23:31:25 +0100
Subject: Remove bgp_as4_support variable.

---
 proto/bgp/attrs.c  | 34 ++++++++++------------------------
 proto/bgp/bgp.c    |  6 ------
 proto/bgp/bgp.h    |  2 --
 proto/bgp/config.Y |  2 +-
 4 files changed, 11 insertions(+), 33 deletions(-)

(limited to 'proto/bgp')

diff --git a/proto/bgp/attrs.c b/proto/bgp/attrs.c
index 7b49bdf..ec81bd0 100644
--- a/proto/bgp/attrs.c
+++ b/proto/bgp/attrs.c
@@ -196,16 +196,8 @@ bgp_format_aggregator(eattr *a, byte *buf, int buflen UNUSED)
   byte *data = ad->data;
   u32 as;
 
-  if (bgp_as4_support)
-    {
-      as = get_u32(data);
-      data += 4;
-    }
-  else
-    {
-      as = get_u16(data);
-      data += 2;
-    }
+  as = get_u32(data);
+  data += 4;
 
   bsprintf(buf, "%d.%d.%d.%d AS%d", data[0], data[1], data[2], data[3], as);
 }
@@ -279,9 +271,8 @@ static struct attr_desc bgp_attr_table[] = {
     NULL, NULL }
 };
 
-/* BA_AS4_PATH is type EAF_TYPE_OPAQUE and not type EAF_TYPE_AS_PATH because
- * EAF_TYPE_AS_PATH is supposed to have different format (2 or 4 B for each ASN)
- * depending on bgp_as4_support variable.
+/* BA_AS4_PATH is type EAF_TYPE_OPAQUE and not type EAF_TYPE_AS_PATH.
+ * It does not matter as this attribute does not appear on routes in the routing table.
  */
 
 #define ATTR_KNOWN(code) ((code) < ARRAY_SIZE(bgp_attr_table) && bgp_attr_table[code].name)
@@ -449,7 +440,7 @@ bgp_encode_attrs(struct bgp_proto *p, byte *w, ea_list *attrs, int remains)
        * we have to convert our 4B AS_PATH to 2B AS_PATH and send our AS_PATH 
        * as optional AS4_PATH attribute.
        */
-      if ((code == BA_AS_PATH) && bgp_as4_support && (! p->as4_session))
+      if ((code == BA_AS_PATH) && (! p->as4_session))
 	{
 	  len = a->u.ptr->length;
 
@@ -491,7 +482,7 @@ bgp_encode_attrs(struct bgp_proto *p, byte *w, ea_list *attrs, int remains)
 	}
 
       /* The same issue with AGGREGATOR attribute */
-      if ((code == BA_AGGREGATOR) && bgp_as4_support && (! p->as4_session))
+      if ((code == BA_AGGREGATOR) && (! p->as4_session))
 	{
 	  int new_used;
 
@@ -864,14 +855,10 @@ bgp_create_attrs(struct bgp_proto *p, rte *e, ea_list **attrs, struct linpool *p
     bgp_set_attr_wa(ea->attrs+1, pool, BA_AS_PATH, 0);
   else
     {
-      z = bgp_set_attr_wa(ea->attrs+1, pool, BA_AS_PATH, bgp_as4_support ? 6 : 4);
+      z = bgp_set_attr_wa(ea->attrs+1, pool, BA_AS_PATH, 6);
       z[0] = AS_PATH_SEQUENCE;
       z[1] = 1;				/* 1 AS */
-
-      if (bgp_as4_support)
-	put_u32(z+2, p->local_as);
-      else
-	put_u16(z+2, p->local_as);
+      put_u32(z+2, p->local_as);
     }
 
   z = bgp_set_attr_wa(ea->attrs+2, pool, BA_NEXT_HOP, NEXT_HOP_LENGTH);
@@ -1416,11 +1403,10 @@ bgp_decode_attrs(struct bgp_conn *conn, byte *attr, unsigned int len, struct lin
   /* When receiving attributes from non-AS4-aware BGP speaker,
    * we have to reconstruct 4B AS_PATH and AGGREGATOR attributes
    */
-  if (bgp_as4_support && (! bgp->as4_session))
+  if (! bgp->as4_session)
     bgp_reconstruct_4b_atts(bgp, a, pool);
 
-  if (bgp_as4_support)
-    bgp_remove_as4_attrs(bgp, a);
+  bgp_remove_as4_attrs(bgp, a);
 
   /* If the AS path attribute contains our AS, reject the routes */
   if (bgp_as_path_loopy(bgp, a))
diff --git a/proto/bgp/bgp.c b/proto/bgp/bgp.c
index 24cd202..3cbcb6d 100644
--- a/proto/bgp/bgp.c
+++ b/proto/bgp/bgp.c
@@ -884,12 +884,6 @@ bgp_check(struct bgp_config *c)
   if (!c->remote_as)
     cf_error("Neighbor must be configured");
 
-  if (!bgp_as4_support && c->enable_as4)
-    cf_error("AS4 support disabled globally");
-
-  if (!bgp_as4_support && (c->local_as > 0xFFFF))
-    cf_error("Local AS number out of range");
-
   if (!(c->capabilities && c->enable_as4) && (c->remote_as > 0xFFFF))
     cf_error("Neighbor AS number out of range (AS4 not available)");
 
diff --git a/proto/bgp/bgp.h b/proto/bgp/bgp.h
index 59ec9c1..7cbd655 100644
--- a/proto/bgp/bgp.h
+++ b/proto/bgp/bgp.h
@@ -132,8 +132,6 @@ struct bgp_bucket {
 
 extern struct linpool *bgp_linpool;
 
-extern int bgp_as4_support;
-
 
 void bgp_start_timer(struct timer *t, int value);
 void bgp_check(struct bgp_config *c);
diff --git a/proto/bgp/config.Y b/proto/bgp/config.Y
index 3c73d60..a469b4d 100644
--- a/proto/bgp/config.Y
+++ b/proto/bgp/config.Y
@@ -41,7 +41,7 @@ bgp_proto_start: proto_start BGP {
      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->enable_as4 = 1;
      BGP_CFG->capabilities = 2;
      BGP_CFG->advertise_ipv4 = 1;
  }
-- 
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