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Merge pull request #10509 from mobash-rasool/fixes2

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pimd: Querier to non-querier transistion to be ignored in a case
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Donald Sharp 2022-02-08 14:06:33 -05:00 committed by GitHub
commit 12da18e059
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1 changed files with 24 additions and 0 deletions
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pimd/pim_igmp.c
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@ -377,6 +377,30 @@ static int igmp_recv_query(struct gm_sock *igmp, int query_version,
*/
if (ntohl(from.s_addr) < ntohl(igmp->ifaddr.s_addr)) {
/* As per RFC 2236 section 3:
* When a Querier receives a Leave Group message for a group
* that has group members on the reception interface, it sends
* [Last Member Query Count] Group-Specific Queries every [Last
* Member Query Interval] to the group being left. These
* Group-Specific Queries have their Max Response time set to
* [Last Member Query Interval]. If no Reports are received
* after the response time of the last query expires, the
* routers assume that the group has no local members, as above.
* Any Querier to non-Querier transition is ignored during this
* time; the same router keeps sending the Group-Specific
* Queries.
*/
struct gm_group *group;
group = find_group_by_addr(igmp, group_addr);
if (group && group->t_group_query_retransmit_timer) {
if (PIM_DEBUG_IGMP_TRACE)
zlog_debug(
"%s: lower address query packet from %s is ignored when last member query interval timer is running",
ifp->name, from_str);
return 0;
}
if (PIM_DEBUG_IGMP_TRACE) {
char ifaddr_str[INET_ADDRSTRLEN];
pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str,