bgpd: Implement BGP confederation error handling (RFC5065, Par. 5)
This patch implements BGP confederation error handling in Quagga as described
in RFC5065, paragraph 5.
* bgp_aspath.c: (aspath_confed_check, aspath_left_confed_check) new functions
* bgp_attr.c: (bgp_attr_aspath_check) apply previous and NOTIFY if there's
a problem.
diff --git a/bgpd/bgp_aspath.c b/bgpd/bgp_aspath.c
index 13f32b8..e65541f 100644
--- a/bgpd/bgp_aspath.c
+++ b/bgpd/bgp_aspath.c
@@ -1122,6 +1122,42 @@
return 1;
}
+/* AS path confed check. If aspath contains confed set or sequence then return 1. */
+int
+aspath_confed_check (struct aspath *aspath)
+{
+ struct assegment *seg;
+
+ if ( !(aspath && aspath->segments) )
+ return 0;
+
+ seg = aspath->segments;
+
+ while (seg)
+ {
+ if (seg->type == AS_CONFED_SET || seg->type == AS_CONFED_SEQUENCE)
+ return 1;
+ seg = seg->next;
+ }
+ return 0;
+}
+
+/* Leftmost AS path segment confed check. If leftmost AS segment is of type
+ AS_CONFED_SEQUENCE or AS_CONFED_SET then return 1. */
+int
+aspath_left_confed_check (struct aspath *aspath)
+{
+
+ if ( !(aspath && aspath->segments) )
+ return 0;
+
+ if ( (aspath->segments->type == AS_CONFED_SEQUENCE)
+ || (aspath->segments->type == AS_CONFED_SET) )
+ return 1;
+
+ return 0;
+}
+
/* Merge as1 to as2. as2 should be uninterned aspath. */
static struct aspath *
aspath_merge (struct aspath *as1, struct aspath *as2)