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OSPF: Fix handling of external routes on graceful restart

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We need to flush learned external LSAs a bit later than other LSAs (after
first feed after end of the graceful restart) to avoid flap of external
routes.
This commit is contained in:
Ondrej Zajicek (work)
2019-07-09 03:31:54 +02:00
parent 05e3933c06
commit 85840d4c03
6 changed files with 75 additions and 35 deletions
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38
proto/ospf/ospf.c
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@@ -246,18 +246,33 @@ void
ospf_stop_gr_recovery(struct ospf_proto *p)
{
p->gr_recovery = 0;
p->gr_cleanup = 1;
p->gr_timeout = 0;
channel_graceful_restart_unlock(p->p.main_channel);
/* Reorigination of router/network LSAs is already scheduled */
ospf_mark_lsadb(p);
/*
* NOTE: We should move channel_graceful_restart_unlock() to the end of
* ospf_disp() in order to have local LSA reorigination / LSAdb cleanup /
* routing table recomputation before official end of GR. It does not matter
* when we are single-threaded.
*/
/* Rest is done in ospf_cleanup_gr_recovery() */
}
static void
ospf_cleanup_gr_recovery(struct ospf_proto *p)
{
struct top_hash_entry *en;
/* Flush dirty LSAa except external ones, these will be handled by feed */
WALK_SLIST(en, p->lsal)
if (en->gr_dirty)
{
if ((en->lsa_type == LSA_T_EXT) || (en->lsa_type == LSA_T_NSSA))
en->mode = LSA_M_EXPORT;
else
ospf_flush_lsa(p, en);
}
/* End graceful restart on channel, will also schedule feed */
channel_graceful_restart_unlock(p->p.main_channel);
p->gr_cleanup = 0;
}
static int
@@ -361,6 +376,8 @@ ospf_init(struct proto_config *CF)
P->ifa_notify = cf->ospf2 ? ospf_ifa_notify2 : ospf_ifa_notify3;
P->preexport = ospf_preexport;
P->reload_routes = ospf_reload_routes;
P->feed_begin = ospf_feed_begin;
P->feed_end = ospf_feed_end;
P->make_tmp_attrs = ospf_make_tmp_attrs;
P->store_tmp_attrs = ospf_store_tmp_attrs;
P->rte_better = ospf_rte_better;
@@ -436,6 +453,7 @@ ospf_disp(timer * timer)
{
struct ospf_proto *p = timer->data;
/* Check for end of graceful restart */
if (p->gr_recovery)
ospf_update_gr_recovery(p);
@@ -448,6 +466,10 @@ ospf_disp(timer * timer)
/* Calculate routing table */
if (p->calcrt)
ospf_rt_spf(p);
/* Cleanup after graceful restart */
if (p->gr_cleanup)
ospf_cleanup_gr_recovery(p);
}