From: Nikolay Aleksandrov nikolay@cumulusnetworks.com
[ Upstream commit 5c725b6b65067909548ac9ca9bc777098ec9883d ]
When permanent entries were introduced by the commit below, they were exempt from timing out and thus igmp leave wouldn't affect them unless fast leave was enabled on the port which was added before permanent entries existed. It shouldn't matter if fast leave is enabled or not if the user added a permanent entry it shouldn't be deleted on igmp leave.
Before: $ echo 1 > /sys/class/net/eth4/brport/multicast_fast_leave $ bridge mdb add dev br0 port eth4 grp 229.1.1.1 permanent $ bridge mdb show dev br0 port eth4 grp 229.1.1.1 permanent
< join and leave 229.1.1.1 on eth4 >
$ bridge mdb show $
After: $ echo 1 > /sys/class/net/eth4/brport/multicast_fast_leave $ bridge mdb add dev br0 port eth4 grp 229.1.1.1 permanent $ bridge mdb show dev br0 port eth4 grp 229.1.1.1 permanent
< join and leave 229.1.1.1 on eth4 >
$ bridge mdb show dev br0 port eth4 grp 229.1.1.1 permanent
Fixes: ccb1c31a7a87 ("bridge: add flags to distinguish permanent mdb entires") Signed-off-by: Nikolay Aleksandrov nikolay@cumulusnetworks.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/bridge/br_multicast.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/net/bridge/br_multicast.c +++ b/net/bridge/br_multicast.c @@ -1621,6 +1621,9 @@ br_multicast_leave_group(struct net_brid if (!br_port_group_equal(p, port, src)) continue;
+ if (p->flags & MDB_PG_FLAGS_PERMANENT) + break; + rcu_assign_pointer(*pp, p->next); hlist_del_init(&p->mglist); del_timer(&p->timer);