bridge: mcast: Account for missing attributes

The 'MDBA_MDB' and 'MDBA_MDB_ENTRY' nest attributes are not accounted
for when calculating the size of MDB notifications. Add them along with
comments for existing attributes.
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/bridge/br_mdb.c

@@ -452,11 +452,18 @@ static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
 
 static size_t rtnl_mdb_nlmsg_size(struct net_bridge_port_group *pg)
 {
-	size_t nlmsg_size = NLMSG_ALIGN(sizeof(struct br_port_msg)) +
-			    nla_total_size(sizeof(struct br_mdb_entry)) +
-			    nla_total_size(sizeof(u32));
 	struct net_bridge_group_src *ent;
-	size_t addr_size = 0;
+	size_t nlmsg_size, addr_size = 0;
+
+	nlmsg_size = NLMSG_ALIGN(sizeof(struct br_port_msg)) +
+		     /* MDBA_MDB */
+		     nla_total_size(0) +
+		     /* MDBA_MDB_ENTRY */
+		     nla_total_size(0) +
+		     /* MDBA_MDB_ENTRY_INFO */
+		     nla_total_size(sizeof(struct br_mdb_entry)) +
+		     /* MDBA_MDB_EATTR_TIMER */
+		     nla_total_size(sizeof(u32));
 
 	if (!pg)
 		goto out;