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Implements 'allow local as' option.

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Similar to allowas-in option on other routers.
This commit is contained in:
Ondrej Zajicek
2013-10-21 14:58:32 +02:00
parent f8cc7396cf
commit a15dab76f9
7 changed files with 22 additions and 6 deletions
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3
proto/bgp/attrs.c
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@@ -950,8 +950,9 @@ bgp_create_attrs(struct bgp_proto *p, rte *e, ea_list **attrs, struct linpool *p
static inline int
bgp_as_path_loopy(struct bgp_proto *p, rta *a)
{
int num = p->cf->allow_local_as + 1;
eattr *e = ea_find(a->eattrs, EA_CODE(EAP_BGP, BA_AS_PATH));
return (e && as_path_is_member(e->u.ptr, p->local_as));
return (e && (num > 0) && as_path_contains(e->u.ptr, p->local_as, num));
}
static inline int

1
proto/bgp/bgp.h
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@@ -44,6 +44,7 @@ struct bgp_config {
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) */
int allow_local_as; /* Allow that number of local ASNs in incoming AS_PATHs */
unsigned connect_retry_time;
unsigned hold_time, initial_hold_time;
unsigned keepalive_time;

4
proto/bgp/config.Y
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@@ -26,7 +26,7 @@ CF_KEYWORDS(BGP, LOCAL, NEIGHBOR, AS, HOLD, TIME, CONNECT, RETRY,
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,
SECONDARY)
SECONDARY, ALLOW)
CF_GRAMMAR
@@ -108,6 +108,8 @@ bgp_proto:
| 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 ALLOW LOCAL AS ';' { BGP_CFG->allow_local_as = -1; }
| bgp_proto ALLOW LOCAL AS expr ';' { BGP_CFG->allow_local_as = $5; }
| bgp_proto IGP TABLE rtable ';' { BGP_CFG->igp_table = $4; }
| bgp_proto TTL SECURITY bool ';' { BGP_CFG->ttl_security = $4; }
;