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Honor standard communities (no_export, no_advertise, no_export_subconfed)

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when exporting routes.
This commit is contained in:
Martin Mares 2000-04-17 13:13:08 +00:00
parent 56a2bed46b
commit bd2d8190dd
2 changed files with 43 additions and 4 deletions
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41
proto/bgp/attrs.c
View file

@ -297,6 +297,42 @@ bgp_new_bucket(struct bgp_proto *p, ea_list *new, unsigned hash)
return b;
}
static int
bgp_export_check(struct bgp_proto *p, ea_list *new)
{
eattr *a;
struct adata *d;
/* Check if next hop is valid */
a = ea_find(new, EA_CODE(EAP_BGP, BA_NEXT_HOP));
if (!a || ipa_equal(p->next_hop, *(ip_addr *)a->u.ptr))
{
DBG("\tInvalid NEXT_HOP\n");
return 0;
}
/* Check if we aren't forbidden to export the route by communities */
a = ea_find(new, EA_CODE(EAP_BGP, BA_COMMUNITY));
if (a)
{
d = a->u.ptr;
if (int_set_contains(d, BGP_COMM_NO_ADVERTISE))
{
DBG("\tNO_ADVERTISE\n");
return 0;
}
if (!p->is_internal &&
(int_set_contains(d, BGP_COMM_NO_EXPORT) ||
int_set_contains(d, BGP_COMM_NO_EXPORT_SUBCONFED)))
{
DBG("\tNO_EXPORT\n");
return 0;
}
}
return 1;
}
static struct bgp_bucket *
bgp_get_bucket(struct bgp_proto *p, ea_list *old, ea_list *tmp, int originate)
{
@ -375,10 +411,7 @@ bgp_get_bucket(struct bgp_proto *p, ea_list *old, ea_list *tmp, int originate)
return NULL;
}
/* Check if next hop is valid */
a = ea_find(new, EA_CODE(EAP_BGP, BA_NEXT_HOP));
ASSERT(a);
if (ipa_equal(p->next_hop, *(ip_addr *)a->u.ptr))
if (!bgp_export_check(p, new))
return NULL;
/* Create new bucket */

6
proto/bgp/bgp.h
View file

@ -151,4 +151,10 @@ int bgp_rx(struct birdsock *sk, int size);
#define BS_OPENCONFIRM 4
#define BS_ESTABLISHED 5
/* Well-known communities */
#define BGP_COMM_NO_EXPORT 0xffffff01 /* Don't export outside local AS / confed. */
#define BGP_COMM_NO_ADVERTISE 0xffffff02 /* Don't export at all */
#define BGP_COMM_NO_EXPORT_SUBCONFED 0xffffff03 /* NO_EXPORT even in local confederation */
#endif