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Fixes a bug in duplicit configured stubnets.

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If there was the same configured stubnet on local and remote
router, the remote route always won regardless of its cost.
This commit is contained in:
Ondrej Zajicek 2010-05-26 12:32:30 +02:00
parent 52572e94ec
commit e0a62ad0f8
2 changed files with 15 additions and 7 deletions
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18
proto/ospf/rt.c
View file

@ -244,14 +244,12 @@ add_network(struct ospf_area *oa, ip_addr px, int pxlen, int metric, struct top_
* Local stub networks does not have proper iface in en->nhi
* (because they all have common top_hash_entry en).
* We have to find iface responsible for that stub network.
* Some stubnets does not have any iface. Ignore them.
* Configured stubnets does not have any iface. They will
* be removed in rt_sync().
*/
nf.ifa = find_stub_src(oa, px, pxlen);
nf.nh = IPA_NONE;
if (!nf.ifa)
return;
}
ri_install_net(oa->po, px, pxlen, &nf);
@ -813,7 +811,7 @@ decide_sum_lsa(struct ospf_area *oa, ort *nf, int dest)
return 0;
/* 12.4.3 p4 */
if (nf->n.ifa->oa->areaid == oa->areaid)
if (nf->n.ifa && (nf->n.ifa->oa->areaid == oa->areaid))
return 0;
/* 12.4.3 p5 */
@ -961,7 +959,7 @@ ospf_rt_abr(struct proto_ospf *po)
/* RFC 2328 G.3 - incomplete resolution of virtual next hops */
if (nf->n.type && (nf->n.ifa->type == OSPF_IT_VLINK))
if (nf->n.type && nf->n.ifa && (nf->n.ifa->type == OSPF_IT_VLINK))
reset_ri(&nf->n);
@ -1153,6 +1151,10 @@ ospf_ext_spf(struct proto_ospf *po)
if ((nf2->n.type != RTS_OSPF) && (nf2->n.type != RTS_OSPF_IA))
continue;
/* Next-hop is a part of a configured stubnet */
if (!nf2->n.ifa)
continue;
/* If nh is zero, it is a device route */
nh = ipa_nonzero(nf2->n.nh) ? nf2->n.nh : rt_fwaddr;
nhi = nf2->n.ifa;
@ -1539,6 +1541,10 @@ again1:
if (po->areano > 1)
check_sum_net_lsa(po, nf);
/* Remove configured stubnets */
if (!nf->n.ifa)
reset_ri(&nf->n);
if (reload || memcmp(&nf->n, &nf->o, sizeof(orta)))
{
net *ne = net_get(p->table, nf->fn.prefix, nf->fn.pxlen);

4
proto/ospf/rt.h
View file

@ -72,7 +72,9 @@ ort;
* - nodes may be invalid (fn.type == 0), in that case other invariants don't hold
* - n.metric1 may be at most a small multiple of LSINFINITY,
* therefore sums do not overflow
* - n.oa and n.ifa are always non-NULL
* - n.oa is always non-NULL
* - n.ifa is always non-NULL with one exception - configured stubnet
nodes (in po->rtf). In that case, n.nh is IFA_NONE.
* - oa->rtr does not contain calculating router itself
*/