pimd: PIM BSM Processing bootstrap timer expiry handling

When bs time out occurs,
1. Delete the bsm list
2. Reset the BSR address
3. delete nexthop tracking for the expired BSR
4. Give one more lease of life to all the bsr advertised rp with hold time
5. clear partial list of each grp node if not empty

Signed-off-by: Saravanan K <saravanank@vmware.com>

1 files changed, 58 insertions, 0 deletions

diff --git a/pimd/pim_bsm.c b/pimd/pim_bsm.c
index 66744e334..cd8e9ede2 100644
--- a/pimd/pim_bsm.c
+++ b/pimd/pim_bsm.c
@@ -85,6 +85,64 @@ static void pim_bsm_node_free(struct bsm_info *bsm)
 
 static int pim_on_bs_timer(struct thread *t)
 {
+	struct route_node *rn;
+	struct bsm_scope *scope;
+	struct bsgrp_node *bsgrp_node;
+	struct bsm_rpinfo *bsrp;
+	struct prefix nht_p;
+	char buf[PREFIX2STR_BUFFER];
+	bool is_bsr_tracking = true;
+
+	scope = THREAD_ARG(t);
+	THREAD_OFF(scope->bs_timer);
+
+	if (PIM_DEBUG_BSM)
+		zlog_debug("%s: Bootstrap Timer expired for scope: %d",
+			   __PRETTY_FUNCTION__, scope->sz_id);
+
+	/* Remove next hop tracking for the bsr */
+	nht_p.family = AF_INET;
+	nht_p.prefixlen = IPV4_MAX_BITLEN;
+	nht_p.u.prefix4 = scope->current_bsr;
+	if (PIM_DEBUG_BSM) {
+		prefix2str(&nht_p, buf, sizeof(buf));
+		zlog_debug("%s: Deregister BSR addr %s with Zebra NHT",
+			   __PRETTY_FUNCTION__, buf);
+	}
+	pim_delete_tracked_nexthop(scope->pim, &nht_p, NULL, NULL,
+				   is_bsr_tracking);
+
+	/* Reset scope zone data */
+	scope->accept_nofwd_bsm = false;
+	scope->state = ACCEPT_ANY;
+	scope->current_bsr.s_addr = INADDR_ANY;
+	scope->current_bsr_prio = 0;
+	scope->current_bsr_first_ts = 0;
+	scope->current_bsr_last_ts = 0;
+	scope->bsm_frag_tag = 0;
+	list_delete_all_node(scope->bsm_list);
+
+	for (rn = route_top(scope->bsrp_table); rn; rn = route_next(rn)) {
+
+		bsgrp_node = (struct bsgrp_node *)rn->info;
+		if (!bsgrp_node) {
+			if (PIM_DEBUG_BSM)
+				zlog_debug("%s: bsgrp_node is null",
+					   __PRETTY_FUNCTION__);
+			continue;
+		}
+		/* Give grace time for rp to continue for another hold time */
+		if ((bsgrp_node->bsrp_list) && (bsgrp_node->bsrp_list->count)) {
+			bsrp = listnode_head(bsgrp_node->bsrp_list);
+			pim_g2rp_timer_restart(bsrp, bsrp->rp_holdtime);
+		}
+		/* clear pending list */
+		if ((bsgrp_node->partial_bsrp_list)
+		    && (bsgrp_node->partial_bsrp_list->count)) {
+			list_delete_all_node(bsgrp_node->partial_bsrp_list);
+			bsgrp_node->pend_rp_cnt = 0;
+		}
+	}
 	return 0;
 }