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OSPF: Support for graceful restart

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Implement OSPFv2 (RFC 3623) and OSPFv3 (RFC 5187) graceful restart,
for both restarting and helper sides. Graceful restart is initiated
by 'graceful down' command.
This commit is contained in:
Ondrej Zajicek (work)
2019-06-30 20:12:59 +02:00
parent 8a68316eb9
commit 1a2ad348f6
13 changed files with 660 additions and 26 deletions
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20
proto/ospf/lsupd.c
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@@ -185,6 +185,13 @@ static int ospf_flood_lsupd(struct ospf_proto *p, struct top_hash_entry **lsa_li
static void
ospf_enqueue_lsa(struct ospf_proto *p, struct top_hash_entry *en, struct ospf_iface *ifa)
{
/* Exception for local Grace-LSA, they are flooded synchronously */
if ((en->lsa_type == LSA_T_GR) && (en->lsa.rt == p->router_id))
{
ospf_flood_lsupd(p, &en, 1, 1, ifa);
return;
}
if (ifa->flood_queue_used == ifa->flood_queue_size)
{
/* If we already have full queue, we send some packets */
@@ -591,8 +598,9 @@ ospf_receive_lsupd(struct ospf_packet *pkt, struct ospf_iface *ifa,
}
/* 13. (5f) - handle self-originated LSAs, see also 13.4. */
if ((lsa.rt == p->router_id) ||
(ospf_is_v2(p) && (lsa_type == LSA_T_NET) && ospf_addr_is_local(p, ifa->oa, ipa_from_u32(lsa.id))))
if (!p->gr_recovery &&
((lsa.rt == p->router_id) ||
(ospf_is_v2(p) && (lsa_type == LSA_T_NET) && ospf_addr_is_local(p, ifa->oa, ipa_from_u32(lsa.id)))))
{
OSPF_TRACE(D_EVENTS, "Received unexpected self-originated LSA");
ospf_advance_lsa(p, en, &lsa, lsa_type, lsa_domain, body);
@@ -629,6 +637,14 @@ ospf_receive_lsupd(struct ospf_packet *pkt, struct ospf_iface *ifa,
if (lsa_type == LSA_T_LINK)
ospf_notify_net_lsa(ifa);
/* RFC 3623 3.1 - entering graceful restart helper mode */
if (lsa_type == LSA_T_GR)
ospf_neigh_notify_grace_lsa(n, en);
/* Link received pre-restart router LSA */
if (p->gr_recovery && (lsa_type == LSA_T_RT) && (lsa.rt == p->router_id))
ifa->oa->rt = en;
/* 13. (5b) - flood new LSA */
int flood_back = ospf_flood_lsa(p, en, n);