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LOCAL_PREF is now always present and exported over all ibgp connections [draft]

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Allow setting of address of the local end of the TCP connection.

Several bug fixes.
This commit is contained in:
Martin Mares 2000-04-21 13:01:28 +00:00
parent 2a9e064d7b
commit 8b258e4e65
4 changed files with 31 additions and 9 deletions
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31
proto/bgp/attrs.c
View File

@ -6,9 +6,6 @@
* Can be freely distributed and used under the terms of the GNU GPL.
*/
/* FIXME: Latest draft says that LOCAL_PREF is mandatory for iBGP */
/* FIXME: Mandatory attributes may be missing in messages that don't contain NLRI */
#define LOCAL_DEBUG
#include <stdlib.h>
@ -352,7 +349,7 @@ bgp_get_bucket(struct bgp_proto *p, ea_list *old, ea_list *tmp, int originate)
new = alloca(ea_scan(tmp));
ea_merge(tmp, new);
t->next = NULL;
ea_sort(tmp);
ea_sort(new);
/* Normalize attributes */
d = new->attrs;
@ -470,14 +467,14 @@ bgp_rt_notify(struct proto *P, net *n, rte *new, rte *old, ea_list *tmpa)
static int
bgp_create_attrs(struct bgp_proto *p, rte *e, ea_list **attrs, struct linpool *pool)
{
ea_list *ea = lp_alloc(pool, sizeof(ea_list) + 3*sizeof(eattr));
ea_list *ea = lp_alloc(pool, sizeof(ea_list) + 4*sizeof(eattr));
eattr *a = ea->attrs;
rta *rta = e->attrs;
ea->next = *attrs;
*attrs = ea;
ea->flags = EALF_SORTED;
ea->count = 3;
ea->count = 4;
a->id = EA_CODE(EAP_BGP, BA_ORIGIN);
a->flags = BAF_TRANSITIVE;
@ -502,7 +499,7 @@ bgp_create_attrs(struct bgp_proto *p, rte *e, ea_list **attrs, struct linpool *p
a->u.ptr = lp_alloc(pool, sizeof(struct adata) + 4);
a->u.ptr->length = 4;
z = a->u.ptr->data;
z[0] = 2; /* AS_SEQUENCE */
z[0] = AS_PATH_SEQUENCE;
z[1] = 1; /* 1 AS */
put_u16(z+2, p->local_as);
}
@ -519,6 +516,12 @@ bgp_create_attrs(struct bgp_proto *p, rte *e, ea_list **attrs, struct linpool *p
*(ip_addr *)a->u.ptr->data = p->local_addr;
else
*(ip_addr *)a->u.ptr->data = e->attrs->gw;
a++;
a->id = EA_CODE(EAP_BGP, BA_LOCAL_PREF);
a->flags = BAF_OPTIONAL;
a->type = EAF_TYPE_INT;
a->u.data = 0;
return 0; /* Leave decision to the filters */
}
@ -822,6 +825,20 @@ bgp_decode_attrs(struct bgp_conn *conn, byte *attr, unsigned int len, struct lin
return NULL;
}
/* If there's no local preference, define one */
if (!(seen[0] && (1 << BA_LOCAL_PREF)))
{
ea = lp_alloc(pool, sizeof(ea_list) + sizeof(eattr));
ea->next = a->eattrs;
a->eattrs = ea;
ea->flags = 0;
ea->count = 1;
ea->attrs[0].id = EA_CODE(EAP_BGP, BA_LOCAL_PREF);
ea->attrs[0].flags = BAF_OPTIONAL;
ea->attrs[0].type = EAF_TYPE_INT;
ea->attrs[0].u.data = 0;
}
/* Fill in the remaining rta fields */
e = ea_find(a->eattrs, EA_CODE(EAP_BGP, BA_NEXT_HOP));
ASSERT(e);

5
proto/bgp/bgp.c
View File

@ -210,7 +210,10 @@ bgp_connect(struct bgp_proto *p) /* Enter Connect state and start establishing c
DBG("BGP: Connecting\n");
s = sk_new(p->p.pool);
s->type = SK_TCP_ACTIVE;
s->saddr = p->local_addr;
if (ipa_nonzero(p->cf->source_addr))
s->saddr = p->cf->source_addr;
else
s->saddr = p->local_addr;
s->daddr = p->cf->remote_ip;
s->dport = BGP_PORT;
bgp_setup_sk(p, conn, s);

1
proto/bgp/bgp.h
View File

@ -20,6 +20,7 @@ struct bgp_config {
ip_addr remote_ip;
int multihop; /* Number of hops if multihop */
ip_addr multihop_via; /* Multihop: address to route to */
ip_addr source_addr; /* Source address to use */
int next_hop_self; /* Always set next hop to local IP address */
int compare_path_lengths; /* Use path lengths when selecting best route */
u32 default_local_pref; /* Default value for LOCAL_PREF attribute */

3
proto/bgp/config.Y
View File

@ -17,7 +17,7 @@ CF_DECLS
CF_KEYWORDS(BGP, LOCAL, NEIGHBOR, AS, HOLD, TIME, CONNECT, RETRY, KEEPALIVE,
MULTIHOP, STARTUP, VIA, NEXT, HOP, SELF, DEFAULT, PATH, METRIC,
BGP_PATH, BGP_LOCAL_PREF, BGP_MED, BGP_ORIGIN, BGP_NEXT_HOP,
BGP_ATOMIC_AGGR, BGP_AGGREGATOR, BGP_COMMUNITY)
BGP_ATOMIC_AGGR, BGP_AGGREGATOR, BGP_COMMUNITY, SOURCE, ADDRESS)
CF_GRAMMAR
@ -55,6 +55,7 @@ bgp_proto:
| bgp_proto PATH METRIC NUM ';' { BGP_CFG->compare_path_lengths = $4; }
| bgp_proto DEFAULT BGP_MED NUM ';' { BGP_CFG->default_med = $4; }
| bgp_proto DEFAULT BGP_LOCAL_PREF NUM ';' { BGP_CFG->default_local_pref = $4; }
| bgp_proto SOURCE ADDRESS IPA ';' { BGP_CFG->source_addr = $4; }
;
CF_ADDTO(dynamic_attr, BGP_PATH