[PATCH net-next v2 05/14] net: bridge: mcast: track active state, foreign IGMP/MLD querier disappearance

["Linus Lüssing" <linus.luessing@c0d3.blue>]

This change ensures that the new multicast active state variable is unset
again after a foreign IGMP/MLD querier has disappeared (default: 255
seconds). If no new, other IGMP/MLD querier took over then we can't
reliably receive IGMP/MLD reports anymore and in turn can't ensure the
completeness of our MDB anymore either.

No functional change for the fast/data path yet.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
---
 net/bridge/br_multicast.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index d5c623dce7eb..0fc29875db9c 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1826,6 +1826,10 @@ static void br_multicast_querier_expired(struct net_bridge_mcast *brmctx,
 	br_multicast_start_querier(brmctx, query);
 
 out:
+	/* another IGMP/MLD querier disappeared, set multicast state to inactive
+	 * if our own querier is disabled, too
+	 */
+	br_multicast_update_active(brmctx);
 	spin_unlock(&brmctx->br->multicast_lock);
 }
 
-- 
2.51.0