Merge branch 'bridge-mcast-fixes'

Nikolay Aleksandrov says:

====================
net: bridge: mcast: fixes for mcast querier state

These three fix querier state dumping. The first patch can be considered
a minor behaviour improvement, it avoids dumping querier state when mcast
snooping is disabled. The second patch was a report of sizeof(0) used
for nested netlink attribute size which should be just 0, and the third
patch accounts for IPv6 querier state size when allocating skb for
notifications.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

net/bridge/br_multicast.c

@@ -2928,10 +2928,16 @@ __br_multicast_get_querier_port(struct net_bridge *br,
 
 size_t br_multicast_querier_state_size(void)
 {
-	return nla_total_size(sizeof(0)) +      /* nest attribute */
+	return nla_total_size(0) +		/* nest attribute */
 	       nla_total_size(sizeof(__be32)) + /* BRIDGE_QUERIER_IP_ADDRESS */
 	       nla_total_size(sizeof(int)) +    /* BRIDGE_QUERIER_IP_PORT */
-	       nla_total_size_64bit(sizeof(u64)); /* BRIDGE_QUERIER_IP_OTHER_TIMER */
+	       nla_total_size_64bit(sizeof(u64)) + /* BRIDGE_QUERIER_IP_OTHER_TIMER */
+#if IS_ENABLED(CONFIG_IPV6)
+	       nla_total_size(sizeof(struct in6_addr)) + /* BRIDGE_QUERIER_IPV6_ADDRESS */
+	       nla_total_size(sizeof(int)) +		 /* BRIDGE_QUERIER_IPV6_PORT */
+	       nla_total_size_64bit(sizeof(u64)) +	 /* BRIDGE_QUERIER_IPV6_OTHER_TIMER */
+#endif
+	       0;
 }
 
 /* protected by rtnl or rcu */
@@ -2943,6 +2949,10 @@ int br_multicast_dump_querier_state(struct sk_buff *skb,
 	struct net_bridge_port *p;
 	struct nlattr *nest;
 
+	if (!br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED) ||
+	    br_multicast_ctx_vlan_global_disabled(brmctx))
+		return 0;
+
 	nest = nla_nest_start(skb, nest_attr);
 	if (!nest)
 		return -EMSGSIZE;