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Implementation of an option for disabling AS4 support per BGP instance.

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This commit is contained in:
Ondrej Zajicek 2008-10-26 22:48:02 +01:00
parent 4847a894bf
commit ba5ed6f3e4
5 changed files with 20 additions and 13 deletions
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14
proto/bgp/attrs.c
View file

@ -73,13 +73,13 @@ bgp_check_path(byte *a, int len, int bs, int errcode)
static int static int
bgp_check_as_path(struct bgp_proto *p, byte *a, int len) bgp_check_as_path(struct bgp_proto *p, byte *a, int len)
{ {
return bgp_check_path(a, len, (bgp_as4_support && p->as4_support) ? 4 : 2, 11); return bgp_check_path(a, len, p->as4_session ? 4 : 2, 11);
} }
static int static int
bgp_check_as4_path(struct bgp_proto *p, byte *a, int len) bgp_check_as4_path(struct bgp_proto *p, byte *a, int len)
{ {
if (bgp_as4_support && (! p->as4_support)) if (bgp_as4_support && (! p->as4_session))
return bgp_check_path(a, len, 4, 9); return bgp_check_path(a, len, 4, 9);
else else
return 0; return 0;
@ -106,7 +106,7 @@ bgp_check_next_hop(struct bgp_proto *p UNUSED, byte *a, int len)
static int static int
bgp_check_aggregator(struct bgp_proto *p, UNUSED byte *a, int len) bgp_check_aggregator(struct bgp_proto *p, UNUSED byte *a, int len)
{ {
int exp_len = (bgp_as4_support && p->as4_support) ? 8 : 6; int exp_len = p->as4_session ? 8 : 6;
return (len == exp_len) ? 0 : 5; return (len == exp_len) ? 0 : 5;
} }
@ -344,7 +344,7 @@ 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 * we have to convert our 4B AS_PATH to 2B AS_PATH and send our AS_PATH
* as optional AS4_PATH attribute. * as optional AS4_PATH attribute.
*/ */
if ((code == BA_AS_PATH) && bgp_as4_support && (! p->as4_support)) if ((code == BA_AS_PATH) && bgp_as4_support && (! p->as4_session))
{ {
len = a->u.ptr->length; len = a->u.ptr->length;
@ -384,7 +384,7 @@ bgp_encode_attrs(struct bgp_proto *p, byte *w, ea_list *attrs, int remains)
} }
/* The same issue with AGGREGATOR attribute */ /* The same issue with AGGREGATOR attribute */
if ((code == BA_AGGREGATOR) && bgp_as4_support && (! p->as4_support)) if ((code == BA_AGGREGATOR) && bgp_as4_support && (! p->as4_session))
{ {
int new_used; int new_used;
@ -1082,7 +1082,7 @@ bgp_remove_as4_attrs(struct bgp_proto *p, rta *a)
if ((fid == id1) || (fid == id2)) if ((fid == id1) || (fid == id2))
{ {
*el = (*el)->next; *el = (*el)->next;
if (p->as4_support) if (p->as4_session)
log(L_WARN "BGP: Unexpected AS4_* attributes received"); log(L_WARN "BGP: Unexpected AS4_* attributes received");
} }
else else
@ -1246,7 +1246,7 @@ bgp_decode_attrs(struct bgp_conn *conn, byte *attr, unsigned int len, struct lin
/* When receiving attributes from non-AS4-aware BGP speaker, /* When receiving attributes from non-AS4-aware BGP speaker,
* we have to reconstruct 4B AS_PATH and AGGREGATOR attributes * we have to reconstruct 4B AS_PATH and AGGREGATOR attributes
*/ */
if (bgp_as4_support && (! bgp->as4_support)) if (bgp_as4_support && (! bgp->as4_session))
bgp_reconstruct_4b_atts(bgp, a, pool); bgp_reconstruct_4b_atts(bgp, a, pool);
if (bgp_as4_support) if (bgp_as4_support)

6
proto/bgp/bgp.c
View file

@ -636,9 +636,11 @@ bgp_check(struct bgp_config *c)
cf_error("Local AS number must be set"); cf_error("Local AS number must be set");
if (!c->remote_as) if (!c->remote_as)
cf_error("Neighbor must be configured"); cf_error("Neighbor must be configured");
if (!bgp_as4_support && (c->local_as > 0xFFFF)) if (!bgp_as4_support && c->enable_as4)
cf_error("AS4 support disabled globbaly");
if (!c->enable_as4 && (c->local_as > 0xFFFF))
cf_error("Local AS number out of range"); cf_error("Local AS number out of range");
if (!bgp_as4_support && (c->remote_as > 0xFFFF)) if (!c->enable_as4 && (c->remote_as > 0xFFFF))
cf_error("Neighbor AS number out of range"); cf_error("Neighbor AS number out of range");
if ((c->local_as != c->remote_as) && (c->rr_client)) if ((c->local_as != c->remote_as) && (c->rr_client))
cf_error("Only internal neighbor can be RR client"); cf_error("Only internal neighbor can be RR client");

2
proto/bgp/bgp.h
View file

@ -25,6 +25,7 @@ struct bgp_config {
int compare_path_lengths; /* Use path lengths when selecting best route */ int compare_path_lengths; /* Use path lengths when selecting best route */
u32 default_local_pref; /* Default value for LOCAL_PREF attribute */ u32 default_local_pref; /* Default value for LOCAL_PREF attribute */
u32 default_med; /* Default value for MULTI_EXIT_DISC attribute */ u32 default_med; /* Default value for MULTI_EXIT_DISC attribute */
int enable_as4; /* Enable local support for 4B AS numbers [RFC4893] */
u32 rr_cluster_id; /* Route reflector cluster ID, if different from local ID */ u32 rr_cluster_id; /* Route reflector cluster ID, if different from local ID */
int rr_client; /* Whether neighbor is RR client of me */ int rr_client; /* Whether neighbor is RR client of me */
unsigned connect_retry_time; unsigned connect_retry_time;
@ -60,6 +61,7 @@ struct bgp_proto {
u32 local_as, remote_as; u32 local_as, remote_as;
int is_internal; /* Internal BGP connection (local_as == remote_as) */ int is_internal; /* Internal BGP connection (local_as == remote_as) */
int as4_support; /* Peer supports 4B AS numbers [RFC4893] */ int as4_support; /* Peer supports 4B AS numbers [RFC4893] */
int as4_session; /* Session uses 4B AS numbers in AS_PATH (both sides support it) */
u32 local_id; /* BGP identifier of this router */ u32 local_id; /* BGP identifier of this router */
u32 remote_id; /* BGP identifier of the neighbor */ u32 remote_id; /* BGP identifier of the neighbor */
u32 rr_cluster_id; /* Route reflector cluster ID */ u32 rr_cluster_id; /* Route reflector cluster ID */

6
proto/bgp/config.Y
View file

@ -18,10 +18,10 @@ CF_DECLS
CF_KEYWORDS(BGP, LOCAL, NEIGHBOR, AS, HOLD, TIME, CONNECT, RETRY, KEEPALIVE, CF_KEYWORDS(BGP, LOCAL, NEIGHBOR, AS, HOLD, TIME, CONNECT, RETRY, KEEPALIVE,
MULTIHOP, STARTUP, VIA, NEXT, HOP, SELF, DEFAULT, PATH, METRIC, MULTIHOP, STARTUP, VIA, NEXT, HOP, SELF, DEFAULT, PATH, METRIC,
ERROR, START, DELAY, FORGET, WAIT, DISABLE, AFTER, ERROR, START, DELAY, FORGET, WAIT, ENABLE, DISABLE, AFTER,
BGP_PATH, BGP_LOCAL_PREF, BGP_MED, BGP_ORIGIN, BGP_NEXT_HOP, BGP_PATH, BGP_LOCAL_PREF, BGP_MED, BGP_ORIGIN, BGP_NEXT_HOP,
BGP_ATOMIC_AGGR, BGP_AGGREGATOR, BGP_COMMUNITY, SOURCE, ADDRESS, BGP_ATOMIC_AGGR, BGP_AGGREGATOR, BGP_COMMUNITY, SOURCE, ADDRESS,
PASSWORD, RR, CLIENT, CLUSTER, ID) PASSWORD, RR, CLIENT, CLUSTER, ID, AS4)
CF_GRAMMAR CF_GRAMMAR
@ -39,6 +39,7 @@ bgp_proto_start: proto_start BGP {
BGP_CFG->error_amnesia_time = 300; BGP_CFG->error_amnesia_time = 300;
BGP_CFG->error_delay_time_min = 60; BGP_CFG->error_delay_time_min = 60;
BGP_CFG->error_delay_time_max = 300; BGP_CFG->error_delay_time_max = 300;
BGP_CFG->enable_as4 = bgp_as4_support;
} }
; ;
@ -68,6 +69,7 @@ bgp_proto:
| bgp_proto ERROR FORGET TIME expr ';' { BGP_CFG->error_amnesia_time = $5; } | 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 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 DISABLE AFTER ERROR bool ';' { BGP_CFG->disable_after_error = $5; }
| bgp_proto ENABLE AS4 bool ';' { BGP_CFG->enable_as4 = $4; }
| bgp_proto PASSWORD TEXT ';' { BGP_CFG->password = $3; } | bgp_proto PASSWORD TEXT ';' { BGP_CFG->password = $3; }
; ;

5
proto/bgp/packets.c
View file

@ -73,7 +73,7 @@ bgp_create_open(struct bgp_conn *conn, byte *buf)
#ifdef IPV6 #ifdef IPV6
cap = bgp_put_cap_ipv6(conn, cap); cap = bgp_put_cap_ipv6(conn, cap);
#endif #endif
if (bgp_as4_support) if (p->cf->enable_as4)
cap = bgp_put_cap_as4(conn, cap); cap = bgp_put_cap_as4(conn, cap);
cap_len = cap - buf - 12; cap_len = cap - buf - 12;
@ -407,7 +407,8 @@ bgp_parse_capabilities(struct bgp_conn *conn, byte *opt, int len)
if (cl != 4) if (cl != 4)
goto err; goto err;
p->as4_support = 1; p->as4_support = 1;
if (bgp_as4_support) p->as4_session = p->cf->enable_as4;
if (p->as4_session)
conn->advertised_as = get_u32(opt + 2); conn->advertised_as = get_u32(opt + 2);
break; break;