return OSPF_GR_FALSE;
}
+/*
+ * Actions to be taken when topo change detected
+ * HELPER will exit upon topo change.
+ *
+ * ospf
+ * ospf pointer
+ * lsa
+ * topo change occured due to this lsa type (1 to 5 and 7)
+ *
+ * Returns:
+ * Nothing
+ */
+void ospf_helper_handle_topo_chg(struct ospf *ospf, struct ospf_lsa *lsa)
+{
+ struct listnode *node;
+ struct ospf_interface *oi;
+
+ if (!ospf->active_restarter_cnt)
+ return;
+
+ /* Topo change not required to be hanlded if strict
+ * LSA check is disbaled for this router.
+ */
+ if (!ospf->strict_lsa_check)
+ return;
+
+ if (IS_DEBUG_OSPF_GR_HELPER)
+ zlog_debug(
+ "%s, Topo change detected due to lsa LSID:%s type:%d",
+ __PRETTY_FUNCTION__, inet_ntoa(lsa->data->id),
+ lsa->data->type);
+
+ lsa->to_be_acknowledged = OSPF_GR_TRUE;
+
+ for (ALL_LIST_ELEMENTS_RO(ospf->oiflist, node, oi)) {
+ struct route_node *rn = NULL;
+
+ if (ospf_interface_neighbor_count(oi) == 0)
+ continue;
+
+ /* Ref rfc3623 section 3.2.3.b
+ * If change due to external LSA and if the area is
+ * stub, then it is not a topo change. Since Type-5
+ * lsas will not be flooded in stub area.
+ */
+ if ((oi->area->external_routing == OSPF_AREA_STUB)
+ && (lsa->data->type == OSPF_AS_EXTERNAL_LSA)) {
+ continue;
+ }
+
+ for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) {
+ struct ospf_neighbor *nbr = NULL;
+
+ if (!rn->info)
+ continue;
+
+ nbr = rn->info;
+
+ if (OSPF_GR_IS_ACTIVE_HELPER(nbr))
+ ospf_gr_helper_exit(nbr,
+ OSPF_GR_HELPER_TOPO_CHG);
+ }
+ }
+}
+
/*
* Api to exit from HELPER role to take all actions
* required at exit.
void ospf_gr_helper_exit(struct ospf_neighbor *nbr,
enum ospf_helper_exit_reason reason)
{
- return;
+ struct ospf_interface *oi = nbr->oi;
+ struct ospf *ospf = oi->ospf;
+
+ if (!OSPF_GR_IS_ACTIVE_HELPER(nbr))
+ return;
+
+ if (IS_DEBUG_OSPF_GR_HELPER)
+ zlog_debug("%s, Exiting from HELPER support to %s, due to %s",
+ __PRETTY_FUNCTION__, inet_ntoa(nbr->src),
+ ospf_exit_reason_desc[reason]);
+
+ /* Reset helper status*/
+ nbr->gr_helper_info.gr_helper_status = OSPF_GR_NOT_HELPER;
+ nbr->gr_helper_info.helper_exit_reason = reason;
+ nbr->gr_helper_info.actual_grace_period = 0;
+ nbr->gr_helper_info.recvd_grace_period = 0;
+ nbr->gr_helper_info.gr_restart_reason = 0;
+ ospf->last_exit_reason = reason;
+
+ if (ospf->active_restarter_cnt <= 0) {
+ zlog_err(
+ "OSPF GR-Helper: active_restarter_cnt should be greater than zero here.");
+ return;
+ }
+ /* Decrement active Restarter count */
+ ospf->active_restarter_cnt--;
+
+ /* If the exit not triggered due to grace timer
+ * expairy , stop the grace timer.
+ */
+ if (reason != OSPF_GR_HELPER_GRACE_TIMEOUT)
+ THREAD_OFF(nbr->gr_helper_info.t_grace_timer);
+
+ /* check exit triggered due to successful completion
+ * of graceful restart.
+ * If no, bringdown the neighbour.
+ */
+ if (reason != OSPF_GR_HELPER_COMPLETED) {
+ if (IS_DEBUG_OSPF_GR_HELPER)
+ zlog_debug(
+ "%s, Failed GR exit, so bringing down the neighbour",
+ __PRETTY_FUNCTION__);
+ OSPF_NSM_EVENT_EXECUTE(nbr, NSM_KillNbr);
+ }
+
+ /*Recalculate the DR for the network segment */
+ ospf_dr_election(oi);
+
+ /* Originate a router LSA */
+ ospf_router_lsa_update_area(oi->area);
+
+ /* Originate network lsa if it is an DR in the LAN */
+ if (oi->state == ISM_DR)
+ ospf_network_lsa_update(oi);
}
/*
* Process Maxage Grace LSA.
- * It is a indication for successfull completion of GR.
+ * It is a indication for successful completion of GR.
* If router acting as HELPER, It exits from helper role.
*
* ospf
void ospf_process_maxage_grace_lsa(struct ospf *ospf, struct ospf_lsa *lsa,
struct ospf_neighbor *nbr)
{
- return;
+ struct in_addr restartAddr = {0};
+ uint8_t restartReason = 0;
+ uint32_t graceInterval = 0;
+ struct ospf_neighbor *restarter = NULL;
+ struct ospf_interface *oi = nbr->oi;
+ int ret;
+
+ /* Extract the grace lsa packet fields */
+ ret = ospf_extract_grace_lsa_fields(lsa, &graceInterval, &restartAddr,
+ &restartReason);
+ if (ret != OSPF_GR_SUCCESS) {
+ if (IS_DEBUG_OSPF_GR_HELPER)
+ zlog_debug("%s, Wrong Grace LSA packet.",
+ __PRETTY_FUNCTION__);
+ return;
+ }
+
+ if (IS_DEBUG_OSPF_GR_HELPER)
+ zlog_debug("%s, GraceLSA received for neighbour %s.",
+ __PRETTY_FUNCTION__, inet_ntoa(restartAddr));
+
+ /* In case of broadcast links, if RESTARTER is DR_OTHER,
+ * grace LSA might be received from DR, so fetching the
+ * actual neighbour information using restarter address.
+ */
+ if (oi->type != OSPF_IFTYPE_POINTOPOINT) {
+ restarter = ospf_nbr_lookup_by_addr(oi->nbrs, &restartAddr);
+
+ if (!restarter) {
+ if (IS_DEBUG_OSPF_GR_HELPER)
+ zlog_debug(
+ "%s, Restarter is not a neighbour for this router.",
+ __PRETTY_FUNCTION__);
+ return;
+ }
+ } else {
+ restarter = nbr;
+ }
+
+ ospf_gr_helper_exit(restarter, OSPF_GR_HELPER_COMPLETED);
}
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