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If no NLRI's are present in an UPDATE message, parse the attributes, but

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don't check presence of mandatory attributes. [draft-09]
This commit is contained in:
Martin Mares 2000-04-21 12:25:35 +00:00
parent f380aa60fa
commit 2a9e064d7b
3 changed files with 16 additions and 13 deletions
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7
proto/bgp/attrs.c
View file

@ -676,7 +676,7 @@ bgp_path_loopy(struct bgp_proto *p, eattr *a)
}
struct rta *
bgp_decode_attrs(struct bgp_conn *conn, byte *attr, unsigned int len, struct linpool *pool)
bgp_decode_attrs(struct bgp_conn *conn, byte *attr, unsigned int len, struct linpool *pool, int mandatory)
{
struct bgp_proto *bgp = conn->bgp;
rta *a = lp_alloc(pool, sizeof(struct rta));
@ -800,6 +800,8 @@ bgp_decode_attrs(struct bgp_conn *conn, byte *attr, unsigned int len, struct lin
}
/* Check if all mandatory attributes are present */
if (mandatory)
{
for(i=0; i < sizeof(bgp_mandatory_attrs)/sizeof(bgp_mandatory_attrs[0]); i++)
{
code = bgp_mandatory_attrs[i];
@ -809,6 +811,7 @@ bgp_decode_attrs(struct bgp_conn *conn, byte *attr, unsigned int len, struct lin
return NULL;
}
}
}
/* If the AS path attribute contains our AS, reject the routes */
e = ea_find(a->eattrs, EA_CODE(EAP_BGP, BA_AS_PATH));
@ -831,7 +834,7 @@ bgp_decode_attrs(struct bgp_conn *conn, byte *attr, unsigned int len, struct lin
neigh = neigh_find(&bgp->p, &nexthop, 0) ? : bgp->neigh;
a->gw = neigh->addr;
a->iface = neigh->iface;
return rta_lookup(a);
return a;
malformed:
bgp_error(conn, 3, 1, len, 0);

2
proto/bgp/bgp.h
View file

@ -94,7 +94,7 @@ void bgp_close_conn(struct bgp_conn *c);
/* attrs.c */
struct rta *bgp_decode_attrs(struct bgp_conn *conn, byte *a, unsigned int len, struct linpool *pool);
struct rta *bgp_decode_attrs(struct bgp_conn *conn, byte *a, unsigned int len, struct linpool *pool, int mandatory);
int bgp_get_attr(struct eattr *e, byte *buf);
int bgp_rte_better(struct rte *, struct rte *);
void bgp_rt_notify(struct proto *, struct network *, struct rte *, struct rte *, struct ea_list *);

10
proto/bgp/packets.c
View file

@ -305,6 +305,7 @@ bgp_rx_update(struct bgp_conn *conn, byte *pkt, int len)
int withdrawn_len, attr_len, nlri_len, pxlen;
net *n;
rte e;
rta *a0;
rta *a = NULL;
DBG("BGP: UPDATE\n");
@ -341,11 +342,10 @@ bgp_rx_update(struct bgp_conn *conn, byte *pkt, int len)
rte_update(bgp->p.table, n, &bgp->p, NULL);
}
if (nlri_len)
a0 = bgp_decode_attrs(conn, attrs, attr_len, bgp_linpool, nlri_len);
if (a0 && nlri_len)
{
a = bgp_decode_attrs(conn, attrs, attr_len, bgp_linpool);
if (!a)
return;
a = rta_lookup(a0);
while (nlri_len)
{
rte *e;
@ -357,9 +357,9 @@ bgp_rx_update(struct bgp_conn *conn, byte *pkt, int len)
e->pflags = 0;
rte_update(bgp->p.table, n, &bgp->p, e);
}
lp_flush(bgp_linpool);
rta_free(a);
}
lp_flush(bgp_linpool);
return;
malformed: