diff options
| author | Mobashshera Rasool <mrasool@vmware.com> | 2022-02-06 23:23:21 -0800 |
|---|---|---|
| committer | Mobashshera Rasool <mrasool@vmware.com> | 2022-02-07 01:46:19 -0800 |
| commit | 5bc4a46b007b14a4b3729f11d0160402b8e89429 (patch) | |
| tree | dea8e10d7fa922a80fb97bd2968c18820917226c /pimd/pim_igmp.c | |
| parent | 8dd61ca240ca0c95b6b05d6050f2c2c726219631 (diff) | |
pimd: Querier to non-querier transistion to be ignored in a case
As per RFC 2236 section 3, when the leave message is received at a querier,
it starts sending Query messages for "last Member Query Interval*query count"
During this time there should not be any querier to non-querier
transition and the same router needs to send the remaning queries.
Fixes: #10422
Signed-off-by: Mobashshera Rasool <mrasool@vmware.com>
Diffstat (limited to 'pimd/pim_igmp.c')
| -rw-r--r-- | pimd/pim_igmp.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/pimd/pim_igmp.c b/pimd/pim_igmp.c index cf7613f4e4..512384d642 100644 --- a/pimd/pim_igmp.c +++ b/pimd/pim_igmp.c @@ -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, |