bridge: send query as soon as leave is received

Continue sending queries when leave is received if the user marks
it as a querier.

Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Adam Baker <linux@baker-net.org.uk>
Signed-off-by: Cong Wang <amwang@redhat.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 26 insertions, 0 deletions

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 40bda804fbd9..37a467697967 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1250,6 +1250,32 @@ static void br_multicast_leave_group(struct net_bridge *br,
         if (!mp)
                 goto out;
 
+        if (br->multicast_querier &&
+            !timer_pending(&br->multicast_querier_timer)) {
+                __br_multicast_send_query(br, port, &mp->addr);
+
+                time = jiffies + br->multicast_last_member_count *
+                                 br->multicast_last_member_interval;
+                mod_timer(port ? &port->multicast_query_timer :
+                                 &br->multicast_query_timer, time);
+
+                for (p = mlock_dereference(mp->ports, br);
+                     p != NULL;
+                     p = mlock_dereference(p->next, br)) {
+                        if (p->port != port)
+                                continue;
+
+                        if (!hlist_unhashed(&p->mglist) &&
+                            (timer_pending(&p->timer) ?
+                             time_after(p->timer.expires, time) :
+                             try_to_del_timer_sync(&p->timer) >= 0)) {
+                                mod_timer(&p->timer, time);
+                        }
+
+                        break;
+                }
+        }
+
         if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
                 struct net_bridge_port_group __rcu **pp;