1 files changed, 1246 insertions, 290 deletions

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 6980625537c..abfa0b65a11 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -11,6 +11,7 @@
  */
 
 #include <linux/err.h>
+#include <linux/export.h>
 #include <linux/if_ether.h>
 #include <linux/igmp.h>
 #include <linux/jhash.h>
@@ -23,31 +24,83 @@
 #include <linux/skbuff.h>
 #include <linux/slab.h>
 #include <linux/timer.h>
+#include <linux/inetdevice.h>
 #include <net/ip.h>
+#if IS_ENABLED(CONFIG_IPV6)
+#include <net/ipv6.h>
+#include <net/mld.h>
+#include <net/ip6_checksum.h>
+#include <net/addrconf.h>
+#endif
 
 #include "br_private.h"
 
-static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb, __be32 ip)
+static void br_multicast_start_querier(struct net_bridge *br,
+				       struct bridge_mcast_own_query *query);
+unsigned int br_mdb_rehash_seq;
+
+static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
+{
+	if (a->proto != b->proto)
+		return 0;
+	if (a->vid != b->vid)
+		return 0;
+	switch (a->proto) {
+	case htons(ETH_P_IP):
+		return a->u.ip4 == b->u.ip4;
+#if IS_ENABLED(CONFIG_IPV6)
+	case htons(ETH_P_IPV6):
+		return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
+#endif
+	}
+	return 0;
+}
+
+static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
+				__u16 vid)
 {
-	return jhash_1word(mdb->secret, (u32)ip) & (mdb->max - 1);
+	return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
+				const struct in6_addr *ip,
+				__u16 vid)
+{
+	return jhash_2words(ipv6_addr_hash(ip), vid,
+			    mdb->secret) & (mdb->max - 1);
+}
+#endif
+
+static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
+			     struct br_ip *ip)
+{
+	switch (ip->proto) {
+	case htons(ETH_P_IP):
+		return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
+#if IS_ENABLED(CONFIG_IPV6)
+	case htons(ETH_P_IPV6):
+		return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
+#endif
+	}
+	return 0;
 }
 
 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
-	struct net_bridge_mdb_htable *mdb, __be32 dst, int hash)
+	struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
 {
 	struct net_bridge_mdb_entry *mp;
-	struct hlist_node *p;
 
-	hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
-		if (dst == mp->addr)
+	hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
+		if (br_ip_equal(&mp->addr, dst))
 			return mp;
 	}
 
 	return NULL;
 }
 
-static struct net_bridge_mdb_entry *br_mdb_ip_get(
-	struct net_bridge_mdb_htable *mdb, __be32 dst)
+struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
+					   struct br_ip *dst)
 {
 	if (!mdb)
 		return NULL;
@@ -55,20 +108,62 @@ static struct net_bridge_mdb_entry *br_mdb_ip_get(
 	return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
 }
 
+static struct net_bridge_mdb_entry *br_mdb_ip4_get(
+	struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
+{
+	struct br_ip br_dst;
+
+	br_dst.u.ip4 = dst;
+	br_dst.proto = htons(ETH_P_IP);
+	br_dst.vid = vid;
+
+	return br_mdb_ip_get(mdb, &br_dst);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static struct net_bridge_mdb_entry *br_mdb_ip6_get(
+	struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
+	__u16 vid)
+{
+	struct br_ip br_dst;
+
+	br_dst.u.ip6 = *dst;
+	br_dst.proto = htons(ETH_P_IPV6);
+	br_dst.vid = vid;
+
+	return br_mdb_ip_get(mdb, &br_dst);
+}
+#endif
+
 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
-					struct sk_buff *skb)
+					struct sk_buff *skb, u16 vid)
 {
+	struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
+	struct br_ip ip;
+
 	if (br->multicast_disabled)
 		return NULL;
 
+	if (BR_INPUT_SKB_CB(skb)->igmp)
+		return NULL;
+
+	ip.proto = skb->protocol;
+	ip.vid = vid;
+
 	switch (skb->protocol) {
 	case htons(ETH_P_IP):
-		if (BR_INPUT_SKB_CB(skb)->igmp)
-			break;
-		return br_mdb_ip_get(br->mdb, ip_hdr(skb)->daddr);
+		ip.u.ip4 = ip_hdr(skb)->daddr;
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case htons(ETH_P_IPV6):
+		ip.u.ip6 = ipv6_hdr(skb)->daddr;
+		break;
+#endif
+	default:
+		return NULL;
 	}
 
-	return NULL;
+	return br_mdb_ip_get(mdb, &ip);
 }
 
 static void br_mdb_free(struct rcu_head *head)
@@ -87,15 +182,14 @@ static int br_mdb_copy(struct net_bridge_mdb_htable *new,
 		       int elasticity)
 {
 	struct net_bridge_mdb_entry *mp;
-	struct hlist_node *p;
 	int maxlen;
 	int len;
 	int i;
 
 	for (i = 0; i < old->max; i++)
-		hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver])
+		hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
 			hlist_add_head(&mp->hlist[new->ver],
-				       &new->mhash[br_ip_hash(new, mp->addr)]);
+				       &new->mhash[br_ip_hash(new, &mp->addr)]);
 
 	if (!elasticity)
 		return 0;
@@ -103,7 +197,7 @@ static int br_mdb_copy(struct net_bridge_mdb_htable *new,
 	maxlen = 0;
 	for (i = 0; i < new->max; i++) {
 		len = 0;
-		hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver])
+		hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
 			len++;
 		if (len > maxlen)
 			maxlen = len;
@@ -112,7 +206,7 @@ static int br_mdb_copy(struct net_bridge_mdb_htable *new,
 	return maxlen > elasticity ? -EINVAL : 0;
 }
 
-static void br_multicast_free_pg(struct rcu_head *head)
+void br_multicast_free_pg(struct rcu_head *head)
 {
 	struct net_bridge_port_group *p =
 		container_of(head, struct net_bridge_port_group, rcu);
@@ -138,17 +232,16 @@ static void br_multicast_group_expired(unsigned long data)
 	if (!netif_running(br->dev) || timer_pending(&mp->timer))
 		goto out;
 
-	if (!hlist_unhashed(&mp->mglist))
-		hlist_del_init(&mp->mglist);
+	mp->mglist = false;
 
 	if (mp->ports)
 		goto out;
 
-	mdb = br->mdb;
+	mdb = mlock_dereference(br->mdb, br);
+
 	hlist_del_rcu(&mp->hlist[mdb->ver]);
 	mdb->size--;
 
-	del_timer(&mp->query_timer);
 	call_rcu_bh(&mp->rcu, br_multicast_free_group);
 
 out:
@@ -158,26 +251,29 @@ out:
 static void br_multicast_del_pg(struct net_bridge *br,
 				struct net_bridge_port_group *pg)
 {
-	struct net_bridge_mdb_htable *mdb = br->mdb;
+	struct net_bridge_mdb_htable *mdb;
 	struct net_bridge_mdb_entry *mp;
 	struct net_bridge_port_group *p;
-	struct net_bridge_port_group **pp;
+	struct net_bridge_port_group __rcu **pp;
 
-	mp = br_mdb_ip_get(mdb, pg->addr);
+	mdb = mlock_dereference(br->mdb, br);
+
+	mp = br_mdb_ip_get(mdb, &pg->addr);
 	if (WARN_ON(!mp))
 		return;
 
-	for (pp = &mp->ports; (p = *pp); pp = &p->next) {
+	for (pp = &mp->ports;
+	     (p = mlock_dereference(*pp, br)) != NULL;
+	     pp = &p->next) {
 		if (p != pg)
 			continue;
 
-		*pp = p->next;
+		rcu_assign_pointer(*pp, p->next);
 		hlist_del_init(&p->mglist);
 		del_timer(&p->timer);
-		del_timer(&p->query_timer);
 		call_rcu_bh(&p->rcu, br_multicast_free_pg);
 
-		if (!mp->ports && hlist_unhashed(&mp->mglist) &&
+		if (!mp->ports && !mp->mglist &&
 		    netif_running(br->dev))
 			mod_timer(&mp->timer, jiffies);
 
@@ -194,7 +290,7 @@ static void br_multicast_port_group_expired(unsigned long data)
 
 	spin_lock(&br->multicast_lock);
 	if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
-	    hlist_unhashed(&pg->mglist))
+	    hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
 		goto out;
 
 	br_multicast_del_pg(br, pg);
@@ -203,10 +299,10 @@ out:
 	spin_unlock(&br->multicast_lock);
 }
 
-static int br_mdb_rehash(struct net_bridge_mdb_htable **mdbp, int max,
+static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
 			 int elasticity)
 {
-	struct net_bridge_mdb_htable *old = *mdbp;
+	struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
 	struct net_bridge_mdb_htable *mdb;
 	int err;
 
@@ -241,6 +337,7 @@ static int br_mdb_rehash(struct net_bridge_mdb_htable **mdbp, int max,
 		return err;
 	}
 
+	br_mdb_rehash_seq++;
 	call_rcu_bh(&mdb->rcu, br_mdb_free);
 
 out:
@@ -249,8 +346,8 @@ out:
 	return 0;
 }
 
-static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
-						__be32 group)
+static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
+						    __be32 group)
 {
 	struct sk_buff *skb;
 	struct igmphdr *ih;
@@ -267,7 +364,7 @@ static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
 	skb_reset_mac_header(skb);
 	eth = eth_hdr(skb);
 
-	memcpy(eth->h_source, br->dev->dev_addr, 6);
+	ether_addr_copy(eth->h_source, br->dev->dev_addr);
 	eth->h_dest[0] = 1;
 	eth->h_dest[1] = 0;
 	eth->h_dest[2] = 0x5e;
@@ -288,7 +385,8 @@ static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
 	iph->frag_off = htons(IP_DF);
 	iph->ttl = 1;
 	iph->protocol = IPPROTO_IGMP;
-	iph->saddr = 0;
+	iph->saddr = br->multicast_query_use_ifaddr ?
+		     inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
 	iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
 	((u8 *)&iph[1])[0] = IPOPT_RA;
 	((u8 *)&iph[1])[1] = 4;
@@ -314,91 +412,119 @@ out:
 	return skb;
 }
 
-static void br_multicast_send_group_query(struct net_bridge_mdb_entry *mp)
+#if IS_ENABLED(CONFIG_IPV6)
+static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
+						    const struct in6_addr *group)
 {
-	struct net_bridge *br = mp->br;
 	struct sk_buff *skb;
+	struct ipv6hdr *ip6h;
+	struct mld_msg *mldq;
+	struct ethhdr *eth;
+	u8 *hopopt;
+	unsigned long interval;
 
-	skb = br_multicast_alloc_query(br, mp->addr);
+	skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
+						 8 + sizeof(*mldq));
 	if (!skb)
-		goto timer;
-
-	netif_rx(skb);
+		goto out;
 
-timer:
-	if (++mp->queries_sent < br->multicast_last_member_count)
-		mod_timer(&mp->query_timer,
-			  jiffies + br->multicast_last_member_interval);
-}
+	skb->protocol = htons(ETH_P_IPV6);
 
-static void br_multicast_group_query_expired(unsigned long data)
-{
-	struct net_bridge_mdb_entry *mp = (void *)data;
-	struct net_bridge *br = mp->br;
+	/* Ethernet header */
+	skb_reset_mac_header(skb);
+	eth = eth_hdr(skb);
 
-	spin_lock(&br->multicast_lock);
-	if (!netif_running(br->dev) || hlist_unhashed(&mp->mglist) ||
-	    mp->queries_sent >= br->multicast_last_member_count)
-		goto out;
+	ether_addr_copy(eth->h_source, br->dev->dev_addr);
+	eth->h_proto = htons(ETH_P_IPV6);
+	skb_put(skb, sizeof(*eth));
 
-	br_multicast_send_group_query(mp);
+	/* IPv6 header + HbH option */
+	skb_set_network_header(skb, skb->len);
+	ip6h = ipv6_hdr(skb);
+
+	*(__force __be32 *)ip6h = htonl(0x60000000);
+	ip6h->payload_len = htons(8 + sizeof(*mldq));
+	ip6h->nexthdr = IPPROTO_HOPOPTS;
+	ip6h->hop_limit = 1;
+	ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
+	if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
+			       &ip6h->saddr)) {
+		kfree_skb(skb);
+		return NULL;
+	}
+	ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
 
-out:
-	spin_unlock(&br->multicast_lock);
-}
+	hopopt = (u8 *)(ip6h + 1);
+	hopopt[0] = IPPROTO_ICMPV6;		/* next hdr */
+	hopopt[1] = 0;				/* length of HbH */
+	hopopt[2] = IPV6_TLV_ROUTERALERT;	/* Router Alert */
+	hopopt[3] = 2;				/* Length of RA Option */
+	hopopt[4] = 0;				/* Type = 0x0000 (MLD) */
+	hopopt[5] = 0;
+	hopopt[6] = IPV6_TLV_PAD1;		/* Pad1 */
+	hopopt[7] = IPV6_TLV_PAD1;		/* Pad1 */
 
-static void br_multicast_send_port_group_query(struct net_bridge_port_group *pg)
-{
-	struct net_bridge_port *port = pg->port;
-	struct net_bridge *br = port->br;
-	struct sk_buff *skb;
+	skb_put(skb, sizeof(*ip6h) + 8);
 
-	skb = br_multicast_alloc_query(br, pg->addr);
-	if (!skb)
-		goto timer;
+	/* ICMPv6 */
+	skb_set_transport_header(skb, skb->len);
+	mldq = (struct mld_msg *) icmp6_hdr(skb);
+
+	interval = ipv6_addr_any(group) ?
+			br->multicast_query_response_interval :
+			br->multicast_last_member_interval;
+
+	mldq->mld_type = ICMPV6_MGM_QUERY;
+	mldq->mld_code = 0;
+	mldq->mld_cksum = 0;
+	mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
+	mldq->mld_reserved = 0;
+	mldq->mld_mca = *group;
+
+	/* checksum */
+	mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
+					  sizeof(*mldq), IPPROTO_ICMPV6,
+					  csum_partial(mldq,
+						       sizeof(*mldq), 0));
+	skb_put(skb, sizeof(*mldq));
 
-	br_deliver(port, skb);
+	__skb_pull(skb, sizeof(*eth));
 
-timer:
-	if (++pg->queries_sent < br->multicast_last_member_count)
-		mod_timer(&pg->query_timer,
-			  jiffies + br->multicast_last_member_interval);
+out:
+	return skb;
 }
+#endif
 
-static void br_multicast_port_group_query_expired(unsigned long data)
+static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
+						struct br_ip *addr)
 {
-	struct net_bridge_port_group *pg = (void *)data;
-	struct net_bridge_port *port = pg->port;
-	struct net_bridge *br = port->br;
-
-	spin_lock(&br->multicast_lock);
-	if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) ||
-	    pg->queries_sent >= br->multicast_last_member_count)
-		goto out;
-
-	br_multicast_send_port_group_query(pg);
-
-out:
-	spin_unlock(&br->multicast_lock);
+	switch (addr->proto) {
+	case htons(ETH_P_IP):
+		return br_ip4_multicast_alloc_query(br, addr->u.ip4);
+#if IS_ENABLED(CONFIG_IPV6)
+	case htons(ETH_P_IPV6):
+		return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
+#endif
+	}
+	return NULL;
 }
 
 static struct net_bridge_mdb_entry *br_multicast_get_group(
-	struct net_bridge *br, struct net_bridge_port *port, __be32 group,
-	int hash)
+	struct net_bridge *br, struct net_bridge_port *port,
+	struct br_ip *group, int hash)
 {
-	struct net_bridge_mdb_htable *mdb = br->mdb;
+	struct net_bridge_mdb_htable *mdb;
 	struct net_bridge_mdb_entry *mp;
-	struct hlist_node *p;
-	unsigned count = 0;
-	unsigned max;
+	unsigned int count = 0;
+	unsigned int max;
 	int elasticity;
 	int err;
 
-	hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
+	mdb = rcu_dereference_protected(br->mdb, 1);
+	hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
 		count++;
-		if (unlikely(group == mp->addr)) {
+		if (unlikely(br_ip_equal(group, &mp->addr)))
 			return mp;
-		}
 	}
 
 	elasticity = 0;
@@ -406,22 +532,20 @@ static struct net_bridge_mdb_entry *br_multicast_get_group(
 
 	if (unlikely(count > br->hash_elasticity && count)) {
 		if (net_ratelimit())
-			printk(KERN_INFO "%s: Multicast hash table "
-			       "chain limit reached: %s\n",
-			       br->dev->name, port ? port->dev->name :
-						     br->dev->name);
+			br_info(br, "Multicast hash table "
+				"chain limit reached: %s\n",
+				port ? port->dev->name : br->dev->name);
 
 		elasticity = br->hash_elasticity;
 	}
 
 	if (mdb->size >= max) {
 		max *= 2;
-		if (unlikely(max >= br->hash_max)) {
-			printk(KERN_WARNING "%s: Multicast hash table maximum "
-			       "reached, disabling snooping: %s, %d\n",
-			       br->dev->name, port ? port->dev->name :
-						     br->dev->name,
-			       max);
+		if (unlikely(max > br->hash_max)) {
+			br_warn(br, "Multicast hash table maximum of %d "
+				"reached, disabling snooping: %s\n",
+				br->hash_max,
+				port ? port->dev->name : br->dev->name);
 			err = -E2BIG;
 disable:
 			br->multicast_disabled = 1;
@@ -432,22 +556,19 @@ disable:
 	if (max > mdb->max || elasticity) {
 		if (mdb->old) {
 			if (net_ratelimit())
-				printk(KERN_INFO "%s: Multicast hash table "
-				       "on fire: %s\n",
-				       br->dev->name, port ? port->dev->name :
-							     br->dev->name);
+				br_info(br, "Multicast hash table "
+					"on fire: %s\n",
+					port ? port->dev->name : br->dev->name);
 			err = -EEXIST;
 			goto err;
 		}
 
 		err = br_mdb_rehash(&br->mdb, max, elasticity);
 		if (err) {
-			printk(KERN_WARNING "%s: Cannot rehash multicast "
-			       "hash table, disabling snooping: "
-			       "%s, %d, %d\n",
-			       br->dev->name, port ? port->dev->name :
-						     br->dev->name,
-			       mdb->size, err);
+			br_warn(br, "Cannot rehash multicast "
+				"hash table, disabling snooping: %s, %d, %d\n",
+				port ? port->dev->name : br->dev->name,
+				mdb->size, err);
 			goto disable;
 		}
 
@@ -462,16 +583,19 @@ err:
 	return mp;
 }
 
-static struct net_bridge_mdb_entry *br_multicast_new_group(
-	struct net_bridge *br, struct net_bridge_port *port, __be32 group)
+struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
+	struct net_bridge_port *port, struct br_ip *group)
 {
-	struct net_bridge_mdb_htable *mdb = br->mdb;
+	struct net_bridge_mdb_htable *mdb;
 	struct net_bridge_mdb_entry *mp;
 	int hash;
+	int err;
 
+	mdb = rcu_dereference_protected(br->mdb, 1);
 	if (!mdb) {
-		if (br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0))
-			return NULL;
+		err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
+		if (err)
+			return ERR_PTR(err);
 		goto rehash;
 	}
 
@@ -483,7 +607,7 @@ static struct net_bridge_mdb_entry *br_multicast_new_group(
 
 	case -EAGAIN:
 rehash:
-		mdb = br->mdb;
+		mdb = rcu_dereference_protected(br->mdb, 1);
 		hash = br_ip_hash(mdb, group);
 		break;
 
@@ -493,14 +617,12 @@ rehash:
 
 	mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
 	if (unlikely(!mp))
-		goto out;
+		return ERR_PTR(-ENOMEM);
 
 	mp->br = br;
-	mp->addr = group;
+	mp->addr = *group;
 	setup_timer(&mp->timer, br_multicast_group_expired,
 		    (unsigned long)mp);
-	setup_timer(&mp->query_timer, br_multicast_group_query_expired,
-		    (unsigned long)mp);
 
 	hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
 	mdb->size++;
@@ -509,18 +631,38 @@ out:
 	return mp;
 }
 
+struct net_bridge_port_group *br_multicast_new_port_group(
+			struct net_bridge_port *port,
+			struct br_ip *group,
+			struct net_bridge_port_group __rcu *next,
+			unsigned char state)
+{
+	struct net_bridge_port_group *p;
+
+	p = kzalloc(sizeof(*p), GFP_ATOMIC);
+	if (unlikely(!p))
+		return NULL;
+
+	p->addr = *group;
+	p->port = port;
+	p->state = state;
+	rcu_assign_pointer(p->next, next);
+	hlist_add_head(&p->mglist, &port->mglist);
+	setup_timer(&p->timer, br_multicast_port_group_expired,
+		    (unsigned long)p);
+	return p;
+}
+
 static int br_multicast_add_group(struct net_bridge *br,
-				  struct net_bridge_port *port, __be32 group)
+				  struct net_bridge_port *port,
+				  struct br_ip *group)
 {
 	struct net_bridge_mdb_entry *mp;
 	struct net_bridge_port_group *p;
-	struct net_bridge_port_group **pp;
+	struct net_bridge_port_group __rcu **pp;
 	unsigned long now = jiffies;
 	int err;
 
-	if (ipv4_is_local_multicast(group))
-		return 0;
-
 	spin_lock(&br->multicast_lock);
 	if (!netif_running(br->dev) ||
 	    (port && port->state == BR_STATE_DISABLED))
@@ -528,37 +670,29 @@ static int br_multicast_add_group(struct net_bridge *br,
 
 	mp = br_multicast_new_group(br, port, group);
 	err = PTR_ERR(mp);
-	if (unlikely(IS_ERR(mp) || !mp))
+	if (IS_ERR(mp))
 		goto err;
 
 	if (!port) {
-		hlist_add_head(&mp->mglist, &br->mglist);
+		mp->mglist = true;
 		mod_timer(&mp->timer, now + br->multicast_membership_interval);
 		goto out;
 	}
 
-	for (pp = &mp->ports; (p = *pp); pp = &p->next) {
+	for (pp = &mp->ports;
+	     (p = mlock_dereference(*pp, br)) != NULL;
+	     pp = &p->next) {
 		if (p->port == port)
 			goto found;
 		if ((unsigned long)p->port < (unsigned long)port)
 			break;
 	}
 
-	p = kzalloc(sizeof(*p), GFP_ATOMIC);
-	err = -ENOMEM;
+	p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
 	if (unlikely(!p))
 		goto err;
-
-	p->addr = group;
-	p->port = port;
-	p->next = *pp;
-	hlist_add_head(&p->mglist, &port->mglist);
-	setup_timer(&p->timer, br_multicast_port_group_expired,
-		    (unsigned long)p);
-	setup_timer(&p->query_timer, br_multicast_port_group_query_expired,
-		    (unsigned long)p);
-
 	rcu_assign_pointer(*pp, p);
+	br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
 
 found:
 	mod_timer(&p->timer, now + br->multicast_membership_interval);
@@ -570,6 +704,42 @@ err:
 	return err;
 }
 
+static int br_ip4_multicast_add_group(struct net_bridge *br,
+				      struct net_bridge_port *port,
+				      __be32 group,
+				      __u16 vid)
+{
+	struct br_ip br_group;
+
+	if (ipv4_is_local_multicast(group))
+		return 0;
+
+	br_group.u.ip4 = group;
+	br_group.proto = htons(ETH_P_IP);
+	br_group.vid = vid;
+
+	return br_multicast_add_group(br, port, &br_group);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static int br_ip6_multicast_add_group(struct net_bridge *br,
+				      struct net_bridge_port *port,
+				      const struct in6_addr *group,
+				      __u16 vid)
+{
+	struct br_ip br_group;
+
+	if (ipv6_addr_is_ll_all_nodes(group))
+		return 0;
+
+	br_group.u.ip6 = *group;
+	br_group.proto = htons(ETH_P_IPV6);
+	br_group.vid = vid;
+
+	return br_multicast_add_group(br, port, &br_group);
+}
+#endif
+
 static void br_multicast_router_expired(unsigned long data)
 {
 	struct net_bridge_port *port = (void *)data;
@@ -591,40 +761,109 @@ static void br_multicast_local_router_expired(unsigned long data)
 {
 }
 
-static void br_multicast_send_query(struct net_bridge *br,
-				    struct net_bridge_port *port, u32 sent)
+static void br_multicast_querier_expired(struct net_bridge *br,
+					 struct bridge_mcast_own_query *query)
 {
-	unsigned long time;
-	struct sk_buff *skb;
+	spin_lock(&br->multicast_lock);
+	if (!netif_running(br->dev) || br->multicast_disabled)
+		goto out;
 
-	if (!netif_running(br->dev) || br->multicast_disabled ||
-	    timer_pending(&br->multicast_querier_timer))
-		return;
+	br_multicast_start_querier(br, query);
+
+out:
+	spin_unlock(&br->multicast_lock);
+}
+
+static void br_ip4_multicast_querier_expired(unsigned long data)
+{
+	struct net_bridge *br = (void *)data;
 
-	skb = br_multicast_alloc_query(br, 0);
+	br_multicast_querier_expired(br, &br->ip4_own_query);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static void br_ip6_multicast_querier_expired(unsigned long data)
+{
+	struct net_bridge *br = (void *)data;
+
+	br_multicast_querier_expired(br, &br->ip6_own_query);
+}
+#endif
+
+static void br_multicast_select_own_querier(struct net_bridge *br,
+					    struct br_ip *ip,
+					    struct sk_buff *skb)
+{
+	if (ip->proto == htons(ETH_P_IP))
+		br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
+#if IS_ENABLED(CONFIG_IPV6)
+	else
+		br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
+#endif
+}
+
+static void __br_multicast_send_query(struct net_bridge *br,
+				      struct net_bridge_port *port,
+				      struct br_ip *ip)
+{
+	struct sk_buff *skb;
+
+	skb = br_multicast_alloc_query(br, ip);
 	if (!skb)
-		goto timer;
+		return;
 
 	if (port) {
 		__skb_push(skb, sizeof(struct ethhdr));
 		skb->dev = port->dev;
-		NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
+		NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
 			dev_queue_xmit);
-	} else
+	} else {
+		br_multicast_select_own_querier(br, ip, skb);
 		netif_rx(skb);
+	}
+}
+
+static void br_multicast_send_query(struct net_bridge *br,
+				    struct net_bridge_port *port,
+				    struct bridge_mcast_own_query *own_query)
+{
+	unsigned long time;
+	struct br_ip br_group;
+	struct bridge_mcast_other_query *other_query = NULL;
+
+	if (!netif_running(br->dev) || br->multicast_disabled ||
+	    !br->multicast_querier)
+		return;
+
+	memset(&br_group.u, 0, sizeof(br_group.u));
+
+	if (port ? (own_query == &port->ip4_own_query) :
+		   (own_query == &br->ip4_own_query)) {
+		other_query = &br->ip4_other_query;
+		br_group.proto = htons(ETH_P_IP);
+#if IS_ENABLED(CONFIG_IPV6)
+	} else {
+		other_query = &br->ip6_other_query;
+		br_group.proto = htons(ETH_P_IPV6);
+#endif
+	}
+
+	if (!other_query || timer_pending(&other_query->timer))
+		return;
+
+	__br_multicast_send_query(br, port, &br_group);
 
-timer:
 	time = jiffies;
-	time += sent < br->multicast_startup_query_count ?
+	time += own_query->startup_sent < br->multicast_startup_query_count ?
 		br->multicast_startup_query_interval :
 		br->multicast_query_interval;
-	mod_timer(port ? &port->multicast_query_timer :
-			 &br->multicast_query_timer, time);
+	mod_timer(&own_query->timer, time);
 }
 
-static void br_multicast_port_query_expired(unsigned long data)
+static void
+br_multicast_port_query_expired(struct net_bridge_port *port,
+				struct bridge_mcast_own_query *query)
 {
-	struct net_bridge_port *port = (void *)data;
 	struct net_bridge *br = port->br;
 
 	spin_lock(&br->multicast_lock);
@@ -632,25 +871,43 @@ static void br_multicast_port_query_expired(unsigned long data)
 	    port->state == BR_STATE_BLOCKING)
 		goto out;
 
-	if (port->multicast_startup_queries_sent <
-	    br->multicast_startup_query_count)
-		port->multicast_startup_queries_sent++;
+	if (query->startup_sent < br->multicast_startup_query_count)
+		query->startup_sent++;
 
-	br_multicast_send_query(port->br, port,
-				port->multicast_startup_queries_sent);
+	br_multicast_send_query(port->br, port, query);
 
 out:
 	spin_unlock(&br->multicast_lock);
 }
 
+static void br_ip4_multicast_port_query_expired(unsigned long data)
+{
+	struct net_bridge_port *port = (void *)data;
+
+	br_multicast_port_query_expired(port, &port->ip4_own_query);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static void br_ip6_multicast_port_query_expired(unsigned long data)
+{
+	struct net_bridge_port *port = (void *)data;
+
+	br_multicast_port_query_expired(port, &port->ip6_own_query);
+}
+#endif
+
 void br_multicast_add_port(struct net_bridge_port *port)
 {
 	port->multicast_router = 1;
 
 	setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
 		    (unsigned long)port);
-	setup_timer(&port->multicast_query_timer,
-		    br_multicast_port_query_expired, (unsigned long)port);
+	setup_timer(&port->ip4_own_query.timer,
+		    br_ip4_multicast_port_query_expired, (unsigned long)port);
+#if IS_ENABLED(CONFIG_IPV6)
+	setup_timer(&port->ip6_own_query.timer,
+		    br_ip6_multicast_port_query_expired, (unsigned long)port);
+#endif
 }
 
 void br_multicast_del_port(struct net_bridge_port *port)
@@ -658,13 +915,13 @@ void br_multicast_del_port(struct net_bridge_port *port)
 	del_timer_sync(&port->multicast_router_timer);
 }
 
-static void __br_multicast_enable_port(struct net_bridge_port *port)
+static void br_multicast_enable(struct bridge_mcast_own_query *query)
 {
-	port->multicast_startup_queries_sent = 0;
+	query->startup_sent = 0;
 
-	if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
-	    del_timer(&port->multicast_query_timer))
-		mod_timer(&port->multicast_query_timer, jiffies);
+	if (try_to_del_timer_sync(&query->timer) >= 0 ||
+	    del_timer(&query->timer))
+		mod_timer(&query->timer, jiffies);
 }
 
 void br_multicast_enable_port(struct net_bridge_port *port)
@@ -675,7 +932,10 @@ void br_multicast_enable_port(struct net_bridge_port *port)
 	if (br->multicast_disabled || !netif_running(br->dev))
 		goto out;
 
-	__br_multicast_enable_port(port);
+	br_multicast_enable(&port->ip4_own_query);
+#if IS_ENABLED(CONFIG_IPV6)
+	br_multicast_enable(&port->ip6_own_query);
+#endif
 
 out:
 	spin_unlock(&br->multicast_lock);
@@ -685,22 +945,26 @@ void br_multicast_disable_port(struct net_bridge_port *port)
 {
 	struct net_bridge *br = port->br;
 	struct net_bridge_port_group *pg;
-	struct hlist_node *p, *n;
+	struct hlist_node *n;
 
 	spin_lock(&br->multicast_lock);
-	hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist)
+	hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
 		br_multicast_del_pg(br, pg);
 
 	if (!hlist_unhashed(&port->rlist))
 		hlist_del_init_rcu(&port->rlist);
 	del_timer(&port->multicast_router_timer);
-	del_timer(&port->multicast_query_timer);
+	del_timer(&port->ip4_own_query.timer);
+#if IS_ENABLED(CONFIG_IPV6)
+	del_timer(&port->ip6_own_query.timer);
+#endif
 	spin_unlock(&br->multicast_lock);
 }
 
-static int br_multicast_igmp3_report(struct net_bridge *br,
-				     struct net_bridge_port *port,
-				     struct sk_buff *skb)
+static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
+					 struct net_bridge_port *port,
+					 struct sk_buff *skb,
+					 u16 vid)
 {
 	struct igmpv3_report *ih;
 	struct igmpv3_grec *grec;
@@ -723,11 +987,11 @@ static int br_multicast_igmp3_report(struct net_bridge *br,
 		if (!pskb_may_pull(skb, len))
 			return -EINVAL;
 
-		grec = (void *)(skb->data + len);
+		grec = (void *)(skb->data + len - sizeof(*grec));
 		group = grec->grec_mca;
 		type = grec->grec_type;
 
-		len += grec->grec_nsrcs * 4;
+		len += ntohs(grec->grec_nsrcs) * 4;
 		if (!pskb_may_pull(skb, len))
 			return -EINVAL;
 
@@ -745,7 +1009,7 @@ static int br_multicast_igmp3_report(struct net_bridge *br,
 			continue;
 		}
 
-		err = br_multicast_add_group(br, port, group);
+		err = br_ip4_multicast_add_group(br, port, group, vid);
 		if (err)
 			break;
 	}
@@ -753,24 +1017,166 @@ static int br_multicast_igmp3_report(struct net_bridge *br,
 	return err;
 }
 
+#if IS_ENABLED(CONFIG_IPV6)
+static int br_ip6_multicast_mld2_report(struct net_bridge *br,
+					struct net_bridge_port *port,
+					struct sk_buff *skb,
+					u16 vid)
+{
+	struct icmp6hdr *icmp6h;
+	struct mld2_grec *grec;
+	int i;
+	int len;
+	int num;
+	int err = 0;
+
+	if (!pskb_may_pull(skb, sizeof(*icmp6h)))
+		return -EINVAL;
+
+	icmp6h = icmp6_hdr(skb);
+	num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
+	len = sizeof(*icmp6h);
+
+	for (i = 0; i < num; i++) {
+		__be16 *nsrcs, _nsrcs;
+
+		nsrcs = skb_header_pointer(skb,
+					   len + offsetof(struct mld2_grec,
+							  grec_nsrcs),
+					   sizeof(_nsrcs), &_nsrcs);
+		if (!nsrcs)
+			return -EINVAL;
+
+		if (!pskb_may_pull(skb,
+				   len + sizeof(*grec) +
+				   sizeof(struct in6_addr) * ntohs(*nsrcs)))
+			return -EINVAL;
+
+		grec = (struct mld2_grec *)(skb->data + len);
+		len += sizeof(*grec) +
+		       sizeof(struct in6_addr) * ntohs(*nsrcs);
+
+		/* We treat these as MLDv1 reports for now. */
+		switch (grec->grec_type) {
+		case MLD2_MODE_IS_INCLUDE:
+		case MLD2_MODE_IS_EXCLUDE:
+		case MLD2_CHANGE_TO_INCLUDE:
+		case MLD2_CHANGE_TO_EXCLUDE:
+		case MLD2_ALLOW_NEW_SOURCES:
+		case MLD2_BLOCK_OLD_SOURCES:
+			break;
+
+		default:
+			continue;
+		}
+
+		err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
+						 vid);
+		if (!err)
+			break;
+	}
+
+	return err;
+}
+#endif
+
+static bool br_ip4_multicast_select_querier(struct net_bridge *br,
+					    struct net_bridge_port *port,
+					    __be32 saddr)
+{
+	if (!timer_pending(&br->ip4_own_query.timer) &&
+	    !timer_pending(&br->ip4_other_query.timer))
+		goto update;
+
+	if (!br->ip4_querier.addr.u.ip4)
+		goto update;
+
+	if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
+		goto update;
+
+	return false;
+
+update:
+	br->ip4_querier.addr.u.ip4 = saddr;
+
+	/* update protected by general multicast_lock by caller */
+	rcu_assign_pointer(br->ip4_querier.port, port);
+
+	return true;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static bool br_ip6_multicast_select_querier(struct net_bridge *br,
+					    struct net_bridge_port *port,
+					    struct in6_addr *saddr)
+{
+	if (!timer_pending(&br->ip6_own_query.timer) &&
+	    !timer_pending(&br->ip6_other_query.timer))
+		goto update;
+
+	if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
+		goto update;
+
+	return false;
+
+update:
+	br->ip6_querier.addr.u.ip6 = *saddr;
+
+	/* update protected by general multicast_lock by caller */
+	rcu_assign_pointer(br->ip6_querier.port, port);
+
+	return true;
+}
+#endif
+
+static bool br_multicast_select_querier(struct net_bridge *br,
+					struct net_bridge_port *port,
+					struct br_ip *saddr)
+{
+	switch (saddr->proto) {
+	case htons(ETH_P_IP):
+		return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
+#if IS_ENABLED(CONFIG_IPV6)
+	case htons(ETH_P_IPV6):
+		return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
+#endif
+	}
+
+	return false;
+}
+
+static void
+br_multicast_update_query_timer(struct net_bridge *br,
+				struct bridge_mcast_other_query *query,
+				unsigned long max_delay)
+{
+	if (!timer_pending(&query->timer))
+		query->delay_time = jiffies + max_delay;
+
+	mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
+}
+
+/*
+ * Add port to router_list
+ *  list is maintained ordered by pointer value
+ *  and locked by br->multicast_lock and RCU
+ */
 static void br_multicast_add_router(struct net_bridge *br,
 				    struct net_bridge_port *port)
 {
-	struct hlist_node *p;
-	struct hlist_node **h;
+	struct net_bridge_port *p;
+	struct hlist_node *slot = NULL;
 
-	for (h = &br->router_list.first;
-	     (p = *h) &&
-	     (unsigned long)container_of(p, struct net_bridge_port, rlist) >
-	     (unsigned long)port;
-	     h = &p->next)
-		;
+	hlist_for_each_entry(p, &br->router_list, rlist) {
+		if ((unsigned long) port >= (unsigned long) p)
+			break;
+		slot = &p->rlist;
+	}
 
-	port->rlist.pprev = h;
-	port->rlist.next = p;
-	rcu_assign_pointer(*h, &port->rlist);
-	if (p)
-		p->pprev = &port->rlist.next;
+	if (slot)
+		hlist_add_after_rcu(slot, &port->rlist);
+	else
+		hlist_add_head_rcu(&port->rlist, &br->router_list);
 }
 
 static void br_multicast_mark_router(struct net_bridge *br,
@@ -800,27 +1206,29 @@ timer:
 
 static void br_multicast_query_received(struct net_bridge *br,
 					struct net_bridge_port *port,
-					__be32 saddr)
+					struct bridge_mcast_other_query *query,
+					struct br_ip *saddr,
+					unsigned long max_delay)
 {
-	if (saddr)
-		mod_timer(&br->multicast_querier_timer,
-			  jiffies + br->multicast_querier_interval);
-	else if (timer_pending(&br->multicast_querier_timer))
+	if (!br_multicast_select_querier(br, port, saddr))
 		return;
 
+	br_multicast_update_query_timer(br, query, max_delay);
 	br_multicast_mark_router(br, port);
 }
 
-static int br_multicast_query(struct net_bridge *br,
-			      struct net_bridge_port *port,
-			      struct sk_buff *skb)
+static int br_ip4_multicast_query(struct net_bridge *br,
+				  struct net_bridge_port *port,
+				  struct sk_buff *skb,
+				  u16 vid)
 {
-	struct iphdr *iph = ip_hdr(skb);
+	const struct iphdr *iph = ip_hdr(skb);
 	struct igmphdr *ih = igmp_hdr(skb);
 	struct net_bridge_mdb_entry *mp;
 	struct igmpv3_query *ih3;
 	struct net_bridge_port_group *p;
-	struct net_bridge_port_group **pp;
+	struct net_bridge_port_group __rcu **pp;
+	struct br_ip saddr;
 	unsigned long max_delay;
 	unsigned long now = jiffies;
 	__be32 group;
@@ -831,8 +1239,6 @@ static int br_multicast_query(struct net_bridge *br,
 	    (port && port->state == BR_STATE_DISABLED))
 		goto out;
 
-	br_multicast_query_received(br, port, iph->saddr);
-
 	group = ih->group;
 
 	if (skb->len == sizeof(*ih)) {
@@ -856,26 +1262,42 @@ static int br_multicast_query(struct net_bridge *br,
 			    IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
 	}
 
-	if (!group)
+	/* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
+	 * all-systems destination addresses (224.0.0.1) for general queries
+	 */
+	if (!group && iph->daddr != htonl(INADDR_ALLHOSTS_GROUP)) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	if (!group) {
+		saddr.proto = htons(ETH_P_IP);
+		saddr.u.ip4 = iph->saddr;
+
+		br_multicast_query_received(br, port, &br->ip4_other_query,
+					    &saddr, max_delay);
 		goto out;
+	}
 
-	mp = br_mdb_ip_get(br->mdb, group);
+	mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
 	if (!mp)
 		goto out;
 
 	max_delay *= br->multicast_last_member_count;
 
-	if (!hlist_unhashed(&mp->mglist) &&
+	if (mp->mglist &&
 	    (timer_pending(&mp->timer) ?
 	     time_after(mp->timer.expires, now + max_delay) :
 	     try_to_del_timer_sync(&mp->timer) >= 0))
 		mod_timer(&mp->timer, now + max_delay);
 
-	for (pp = &mp->ports; (p = *pp); pp = &p->next) {
+	for (pp = &mp->ports;
+	     (p = mlock_dereference(*pp, br)) != NULL;
+	     pp = &p->next) {
 		if (timer_pending(&p->timer) ?
 		    time_after(p->timer.expires, now + max_delay) :
 		    try_to_del_timer_sync(&p->timer) >= 0)
-			mod_timer(&mp->timer, now + max_delay);
+			mod_timer(&p->timer, now + max_delay);
 	}
 
 out:
@@ -883,9 +1305,110 @@ out:
 	return err;
 }
 
-static void br_multicast_leave_group(struct net_bridge *br,
-				     struct net_bridge_port *port,
-				     __be32 group)
+#if IS_ENABLED(CONFIG_IPV6)
+static int br_ip6_multicast_query(struct net_bridge *br,
+				  struct net_bridge_port *port,
+				  struct sk_buff *skb,
+				  u16 vid)
+{
+	const struct ipv6hdr *ip6h = ipv6_hdr(skb);
+	struct mld_msg *mld;
+	struct net_bridge_mdb_entry *mp;
+	struct mld2_query *mld2q;
+	struct net_bridge_port_group *p;
+	struct net_bridge_port_group __rcu **pp;
+	struct br_ip saddr;
+	unsigned long max_delay;
+	unsigned long now = jiffies;
+	const struct in6_addr *group = NULL;
+	bool is_general_query;
+	int err = 0;
+
+	spin_lock(&br->multicast_lock);
+	if (!netif_running(br->dev) ||
+	    (port && port->state == BR_STATE_DISABLED))
+		goto out;
+
+	/* RFC2710+RFC3810 (MLDv1+MLDv2) require link-local source addresses */
+	if (!(ipv6_addr_type(&ip6h->saddr) & IPV6_ADDR_LINKLOCAL)) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	if (skb->len == sizeof(*mld)) {
+		if (!pskb_may_pull(skb, sizeof(*mld))) {
+			err = -EINVAL;
+			goto out;
+		}
+		mld = (struct mld_msg *) icmp6_hdr(skb);
+		max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
+		if (max_delay)
+			group = &mld->mld_mca;
+	} else {
+		if (!pskb_may_pull(skb, sizeof(*mld2q))) {
+			err = -EINVAL;
+			goto out;
+		}
+		mld2q = (struct mld2_query *)icmp6_hdr(skb);
+		if (!mld2q->mld2q_nsrcs)
+			group = &mld2q->mld2q_mca;
+
+		max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
+	}
+
+	is_general_query = group && ipv6_addr_any(group);
+
+	/* RFC2710+RFC3810 (MLDv1+MLDv2) require the multicast link layer
+	 * all-nodes destination address (ff02::1) for general queries
+	 */
+	if (is_general_query && !ipv6_addr_is_ll_all_nodes(&ip6h->daddr)) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	if (is_general_query) {
+		saddr.proto = htons(ETH_P_IPV6);
+		saddr.u.ip6 = ip6h->saddr;
+
+		br_multicast_query_received(br, port, &br->ip6_other_query,
+					    &saddr, max_delay);
+		goto out;
+	} else if (!group) {
+		goto out;
+	}
+
+	mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
+	if (!mp)
+		goto out;
+
+	max_delay *= br->multicast_last_member_count;
+	if (mp->mglist &&
+	    (timer_pending(&mp->timer) ?
+	     time_after(mp->timer.expires, now + max_delay) :
+	     try_to_del_timer_sync(&mp->timer) >= 0))
+		mod_timer(&mp->timer, now + max_delay);
+
+	for (pp = &mp->ports;
+	     (p = mlock_dereference(*pp, br)) != NULL;
+	     pp = &p->next) {
+		if (timer_pending(&p->timer) ?
+		    time_after(p->timer.expires, now + max_delay) :
+		    try_to_del_timer_sync(&p->timer) >= 0)
+			mod_timer(&p->timer, now + max_delay);
+	}
+
+out:
+	spin_unlock(&br->multicast_lock);
+	return err;
+}
+#endif
+
+static void
+br_multicast_leave_group(struct net_bridge *br,
+			 struct net_bridge_port *port,
+			 struct br_ip *group,
+			 struct bridge_mcast_other_query *other_query,
+			 struct bridge_mcast_own_query *own_query)
 {
 	struct net_bridge_mdb_htable *mdb;
 	struct net_bridge_mdb_entry *mp;
@@ -893,39 +1416,82 @@ static void br_multicast_leave_group(struct net_bridge *br,
 	unsigned long now;
 	unsigned long time;
 
-	if (ipv4_is_local_multicast(group))
-		return;
-
 	spin_lock(&br->multicast_lock);
 	if (!netif_running(br->dev) ||
 	    (port && port->state == BR_STATE_DISABLED) ||
-	    timer_pending(&br->multicast_querier_timer))
+	    timer_pending(&other_query->timer))
 		goto out;
 
-	mdb = br->mdb;
+	mdb = mlock_dereference(br->mdb, br);
 	mp = br_mdb_ip_get(mdb, group);
 	if (!mp)
 		goto out;
 
+	if (br->multicast_querier) {
+		__br_multicast_send_query(br, port, &mp->addr);
+
+		time = jiffies + br->multicast_last_member_count *
+				 br->multicast_last_member_interval;
+
+		mod_timer(&own_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;
+
+		for (pp = &mp->ports;
+		     (p = mlock_dereference(*pp, br)) != NULL;
+		     pp = &p->next) {
+			if (p->port != port)
+				continue;
+
+			rcu_assign_pointer(*pp, p->next);
+			hlist_del_init(&p->mglist);
+			del_timer(&p->timer);
+			call_rcu_bh(&p->rcu, br_multicast_free_pg);
+			br_mdb_notify(br->dev, port, group, RTM_DELMDB);
+
+			if (!mp->ports && !mp->mglist &&
+			    netif_running(br->dev))
+				mod_timer(&mp->timer, jiffies);
+		}
+		goto out;
+	}
+
 	now = jiffies;
 	time = now + br->multicast_last_member_count *
 		     br->multicast_last_member_interval;
 
 	if (!port) {
-		if (!hlist_unhashed(&mp->mglist) &&
+		if (mp->mglist &&
 		    (timer_pending(&mp->timer) ?
 		     time_after(mp->timer.expires, time) :
 		     try_to_del_timer_sync(&mp->timer) >= 0)) {
 			mod_timer(&mp->timer, time);
-
-			mp->queries_sent = 0;
-			mod_timer(&mp->query_timer, now);
 		}
 
 		goto out;
 	}
 
-	for (p = mp->ports; p; p = p->next) {
+	for (p = mlock_dereference(mp->ports, br);
+	     p != NULL;
+	     p = mlock_dereference(p->next, br)) {
 		if (p->port != port)
 			continue;
 
@@ -934,32 +1500,70 @@ static void br_multicast_leave_group(struct net_bridge *br,
 		     time_after(p->timer.expires, time) :
 		     try_to_del_timer_sync(&p->timer) >= 0)) {
 			mod_timer(&p->timer, time);
-
-			p->queries_sent = 0;
-			mod_timer(&p->query_timer, now);
 		}
 
 		break;
 	}
-
 out:
 	spin_unlock(&br->multicast_lock);
 }
 
+static void br_ip4_multicast_leave_group(struct net_bridge *br,
+					 struct net_bridge_port *port,
+					 __be32 group,
+					 __u16 vid)
+{
+	struct br_ip br_group;
+	struct bridge_mcast_own_query *own_query;
+
+	if (ipv4_is_local_multicast(group))
+		return;
+
+	own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
+
+	br_group.u.ip4 = group;
+	br_group.proto = htons(ETH_P_IP);
+	br_group.vid = vid;
+
+	br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
+				 own_query);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static void br_ip6_multicast_leave_group(struct net_bridge *br,
+					 struct net_bridge_port *port,
+					 const struct in6_addr *group,
+					 __u16 vid)
+{
+	struct br_ip br_group;
+	struct bridge_mcast_own_query *own_query;
+
+	if (ipv6_addr_is_ll_all_nodes(group))
+		return;
+
+	own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
+
+	br_group.u.ip6 = *group;
+	br_group.proto = htons(ETH_P_IPV6);
+	br_group.vid = vid;
+
+	br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
+				 own_query);
+}
+#endif
+
 static int br_multicast_ipv4_rcv(struct net_bridge *br,
 				 struct net_bridge_port *port,
-				 struct sk_buff *skb)
+				 struct sk_buff *skb,
+				 u16 vid)
 {
 	struct sk_buff *skb2 = skb;
-	struct iphdr *iph;
+	const struct iphdr *iph;
 	struct igmphdr *ih;
-	unsigned len;
-	unsigned offset;
+	unsigned int len;
+	unsigned int offset;
 	int err;
 
-	BR_INPUT_SKB_CB(skb)->igmp = 0;
-	BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
-
 	/* We treat OOM as packet loss for now. */
 	if (!pskb_may_pull(skb, sizeof(*iph)))
 		return -EINVAL;
@@ -977,8 +1581,11 @@ static int br_multicast_ipv4_rcv(struct net_bridge *br,
 	if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
 		return -EINVAL;
 
-	if (iph->protocol != IPPROTO_IGMP)
+	if (iph->protocol != IPPROTO_IGMP) {
+		if (!ipv4_is_local_multicast(iph->daddr))
+			BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
 		return 0;
+	}
 
 	len = ntohs(iph->tot_len);
 	if (skb->len < len || len < ip_hdrlen(skb))
@@ -1003,8 +1610,6 @@ static int br_multicast_ipv4_rcv(struct net_bridge *br,
 	if (!pskb_may_pull(skb2, sizeof(*ih)))
 		goto out;
 
-	iph = ip_hdr(skb2);
-
 	switch (skb2->ip_summed) {
 	case CHECKSUM_COMPLETE:
 		if (!csum_fold(skb2->csum))
@@ -1024,17 +1629,17 @@ static int br_multicast_ipv4_rcv(struct net_bridge *br,
 	switch (ih->type) {
 	case IGMP_HOST_MEMBERSHIP_REPORT:
 	case IGMPV2_HOST_MEMBERSHIP_REPORT:
-		BR_INPUT_SKB_CB(skb2)->mrouters_only = 1;
-		err = br_multicast_add_group(br, port, ih->group);
+		BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
+		err = br_ip4_multicast_add_group(br, port, ih->group, vid);
 		break;
 	case IGMPV3_HOST_MEMBERSHIP_REPORT:
-		err = br_multicast_igmp3_report(br, port, skb2);
+		err = br_ip4_multicast_igmp3_report(br, port, skb2, vid);
 		break;
 	case IGMP_HOST_MEMBERSHIP_QUERY:
-		err = br_multicast_query(br, port, skb2);
+		err = br_ip4_multicast_query(br, port, skb2, vid);
 		break;
 	case IGMP_HOST_LEAVE_MESSAGE:
-		br_multicast_leave_group(br, port, ih->group);
+		br_ip4_multicast_leave_group(br, port, ih->group, vid);
 		break;
 	}
 
@@ -1046,33 +1651,197 @@ err_out:
 	return err;
 }
 
+#if IS_ENABLED(CONFIG_IPV6)
+static int br_multicast_ipv6_rcv(struct net_bridge *br,
+				 struct net_bridge_port *port,
+				 struct sk_buff *skb,
+				 u16 vid)
+{
+	struct sk_buff *skb2;
+	const struct ipv6hdr *ip6h;
+	u8 icmp6_type;
+	u8 nexthdr;
+	__be16 frag_off;
+	unsigned int len;
+	int offset;
+	int err;
+
+	if (!pskb_may_pull(skb, sizeof(*ip6h)))
+		return -EINVAL;
+
+	ip6h = ipv6_hdr(skb);
+
+	/*
+	 * We're interested in MLD messages only.
+	 *  - Version is 6
+	 *  - MLD has always Router Alert hop-by-hop option
+	 *  - But we do not support jumbrograms.
+	 */
+	if (ip6h->version != 6)
+		return 0;
+
+	/* Prevent flooding this packet if there is no listener present */
+	if (!ipv6_addr_is_ll_all_nodes(&ip6h->daddr))
+		BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
+
+	if (ip6h->nexthdr != IPPROTO_HOPOPTS ||
+	    ip6h->payload_len == 0)
+		return 0;
+
+	len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
+	if (skb->len < len)
+		return -EINVAL;
+
+	nexthdr = ip6h->nexthdr;
+	offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
+
+	if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
+		return 0;
+
+	/* Okay, we found ICMPv6 header */
+	skb2 = skb_clone(skb, GFP_ATOMIC);
+	if (!skb2)
+		return -ENOMEM;
+
+	err = -EINVAL;
+	if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
+		goto out;
+
+	len -= offset - skb_network_offset(skb2);
+
+	__skb_pull(skb2, offset);
+	skb_reset_transport_header(skb2);
+	skb_postpull_rcsum(skb2, skb_network_header(skb2),
+			   skb_network_header_len(skb2));
+
+	icmp6_type = icmp6_hdr(skb2)->icmp6_type;
+
+	switch (icmp6_type) {
+	case ICMPV6_MGM_QUERY:
+	case ICMPV6_MGM_REPORT:
+	case ICMPV6_MGM_REDUCTION:
+	case ICMPV6_MLD2_REPORT:
+		break;
+	default:
+		err = 0;
+		goto out;
+	}
+
+	/* Okay, we found MLD message. Check further. */
+	if (skb2->len > len) {
+		err = pskb_trim_rcsum(skb2, len);
+		if (err)
+			goto out;
+		err = -EINVAL;
+	}
+
+	ip6h = ipv6_hdr(skb2);
+
+	switch (skb2->ip_summed) {
+	case CHECKSUM_COMPLETE:
+		if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
+					IPPROTO_ICMPV6, skb2->csum))
+			break;
+		/*FALLTHROUGH*/
+	case CHECKSUM_NONE:
+		skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
+							&ip6h->daddr,
+							skb2->len,
+							IPPROTO_ICMPV6, 0));
+		if (__skb_checksum_complete(skb2))
+			goto out;
+	}
+
+	err = 0;
+
+	BR_INPUT_SKB_CB(skb)->igmp = 1;
+
+	switch (icmp6_type) {
+	case ICMPV6_MGM_REPORT:
+	    {
+		struct mld_msg *mld;
+		if (!pskb_may_pull(skb2, sizeof(*mld))) {
+			err = -EINVAL;
+			goto out;
+		}
+		mld = (struct mld_msg *)skb_transport_header(skb2);
+		BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
+		err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
+		break;
+	    }
+	case ICMPV6_MLD2_REPORT:
+		err = br_ip6_multicast_mld2_report(br, port, skb2, vid);
+		break;
+	case ICMPV6_MGM_QUERY:
+		err = br_ip6_multicast_query(br, port, skb2, vid);
+		break;
+	case ICMPV6_MGM_REDUCTION:
+	    {
+		struct mld_msg *mld;
+		if (!pskb_may_pull(skb2, sizeof(*mld))) {
+			err = -EINVAL;
+			goto out;
+		}
+		mld = (struct mld_msg *)skb_transport_header(skb2);
+		br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
+	    }
+	}
+
+out:
+	kfree_skb(skb2);
+	return err;
+}
+#endif
+
 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
-		     struct sk_buff *skb)
+		     struct sk_buff *skb, u16 vid)
 {
+	BR_INPUT_SKB_CB(skb)->igmp = 0;
+	BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
+
 	if (br->multicast_disabled)
 		return 0;
 
 	switch (skb->protocol) {
 	case htons(ETH_P_IP):
-		return br_multicast_ipv4_rcv(br, port, skb);
+		return br_multicast_ipv4_rcv(br, port, skb, vid);
+#if IS_ENABLED(CONFIG_IPV6)
+	case htons(ETH_P_IPV6):
+		return br_multicast_ipv6_rcv(br, port, skb, vid);
+#endif
 	}
 
 	return 0;
 }
 
-static void br_multicast_query_expired(unsigned long data)
+static void br_multicast_query_expired(struct net_bridge *br,
+				       struct bridge_mcast_own_query *query,
+				       struct bridge_mcast_querier *querier)
+{
+	spin_lock(&br->multicast_lock);
+	if (query->startup_sent < br->multicast_startup_query_count)
+		query->startup_sent++;
+
+	rcu_assign_pointer(querier, NULL);
+	br_multicast_send_query(br, NULL, query);
+	spin_unlock(&br->multicast_lock);
+}
+
+static void br_ip4_multicast_query_expired(unsigned long data)
 {
 	struct net_bridge *br = (void *)data;
 
-	spin_lock(&br->multicast_lock);
-	if (br->multicast_startup_queries_sent <
-	    br->multicast_startup_query_count)
-		br->multicast_startup_queries_sent++;
+	br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
+}
 
-	br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
+#if IS_ENABLED(CONFIG_IPV6)
+static void br_ip6_multicast_query_expired(unsigned long data)
+{
+	struct net_bridge *br = (void *)data;
 
-	spin_unlock(&br->multicast_lock);
+	br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
 }
+#endif
 
 void br_multicast_init(struct net_bridge *br)
 {
@@ -1080,6 +1849,8 @@ void br_multicast_init(struct net_bridge *br)
 	br->hash_max = 512;
 
 	br->multicast_router = 1;
+	br->multicast_querier = 0;
+	br->multicast_query_use_ifaddr = 0;
 	br->multicast_last_member_count = 2;
 	br->multicast_startup_query_count = 2;
 
@@ -1090,39 +1861,65 @@ void br_multicast_init(struct net_bridge *br)
 	br->multicast_querier_interval = 255 * HZ;
 	br->multicast_membership_interval = 260 * HZ;
 
+	br->ip4_other_query.delay_time = 0;
+	br->ip4_querier.port = NULL;
+#if IS_ENABLED(CONFIG_IPV6)
+	br->ip6_other_query.delay_time = 0;
+	br->ip6_querier.port = NULL;
+#endif
+
 	spin_lock_init(&br->multicast_lock);
 	setup_timer(&br->multicast_router_timer,
 		    br_multicast_local_router_expired, 0);
-	setup_timer(&br->multicast_querier_timer,
-		    br_multicast_local_router_expired, 0);
-	setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
+	setup_timer(&br->ip4_other_query.timer,
+		    br_ip4_multicast_querier_expired, (unsigned long)br);
+	setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
+		    (unsigned long)br);
+#if IS_ENABLED(CONFIG_IPV6)
+	setup_timer(&br->ip6_other_query.timer,
+		    br_ip6_multicast_querier_expired, (unsigned long)br);
+	setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
 		    (unsigned long)br);
+#endif
 }
 
-void br_multicast_open(struct net_bridge *br)
+static void __br_multicast_open(struct net_bridge *br,
+				struct bridge_mcast_own_query *query)
 {
-	br->multicast_startup_queries_sent = 0;
+	query->startup_sent = 0;
 
 	if (br->multicast_disabled)
 		return;
 
-	mod_timer(&br->multicast_query_timer, jiffies);
+	mod_timer(&query->timer, jiffies);
+}
+
+void br_multicast_open(struct net_bridge *br)
+{
+	__br_multicast_open(br, &br->ip4_own_query);
+#if IS_ENABLED(CONFIG_IPV6)
+	__br_multicast_open(br, &br->ip6_own_query);
+#endif
 }
 
 void br_multicast_stop(struct net_bridge *br)
 {
 	struct net_bridge_mdb_htable *mdb;
 	struct net_bridge_mdb_entry *mp;
-	struct hlist_node *p, *n;
+	struct hlist_node *n;
 	u32 ver;
 	int i;
 
 	del_timer_sync(&br->multicast_router_timer);
-	del_timer_sync(&br->multicast_querier_timer);
-	del_timer_sync(&br->multicast_query_timer);
+	del_timer_sync(&br->ip4_other_query.timer);
+	del_timer_sync(&br->ip4_own_query.timer);
+#if IS_ENABLED(CONFIG_IPV6)
+	del_timer_sync(&br->ip6_other_query.timer);
+	del_timer_sync(&br->ip6_own_query.timer);
+#endif
 
 	spin_lock_bh(&br->multicast_lock);
-	mdb = br->mdb;
+	mdb = mlock_dereference(br->mdb, br);
 	if (!mdb)
 		goto out;
 
@@ -1130,10 +1927,9 @@ void br_multicast_stop(struct net_bridge *br)
 
 	ver = mdb->ver;
 	for (i = 0; i < mdb->max; i++) {
-		hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i],
+		hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
 					  hlist[ver]) {
 			del_timer(&mp->timer);
-			del_timer(&mp->query_timer);
 			call_rcu_bh(&mp->rcu, br_multicast_free_group);
 		}
 	}
@@ -1222,16 +2018,33 @@ unlock:
 	return err;
 }
 
-int br_multicast_toggle(struct net_bridge *br, unsigned long val)
+static void br_multicast_start_querier(struct net_bridge *br,
+				       struct bridge_mcast_own_query *query)
 {
 	struct net_bridge_port *port;
-	int err = -ENOENT;
 
-	spin_lock(&br->multicast_lock);
-	if (!netif_running(br->dev))
-		goto unlock;
+	__br_multicast_open(br, query);
 
-	err = 0;
+	list_for_each_entry(port, &br->port_list, list) {
+		if (port->state == BR_STATE_DISABLED ||
+		    port->state == BR_STATE_BLOCKING)
+			continue;
+
+		if (query == &br->ip4_own_query)
+			br_multicast_enable(&port->ip4_own_query);
+#if IS_ENABLED(CONFIG_IPV6)
+		else
+			br_multicast_enable(&port->ip6_own_query);
+#endif
+	}
+}
+
+int br_multicast_toggle(struct net_bridge *br, unsigned long val)
+{
+	int err = 0;
+	struct net_bridge_mdb_htable *mdb;
+
+	spin_lock_bh(&br->multicast_lock);
 	if (br->multicast_disabled == !val)
 		goto unlock;
 
@@ -1239,48 +2052,85 @@ int br_multicast_toggle(struct net_bridge *br, unsigned long val)
 	if (br->multicast_disabled)
 		goto unlock;
 
-	if (br->mdb) {
-		if (br->mdb->old) {
+	if (!netif_running(br->dev))
+		goto unlock;
+
+	mdb = mlock_dereference(br->mdb, br);
+	if (mdb) {
+		if (mdb->old) {
 			err = -EEXIST;
 rollback:
 			br->multicast_disabled = !!val;
 			goto unlock;
 		}
 
-		err = br_mdb_rehash(&br->mdb, br->mdb->max,
+		err = br_mdb_rehash(&br->mdb, mdb->max,
 				    br->hash_elasticity);
 		if (err)
 			goto rollback;
 	}
 
-	br_multicast_open(br);
-	list_for_each_entry(port, &br->port_list, list) {
-		if (port->state == BR_STATE_DISABLED ||
-		    port->state == BR_STATE_BLOCKING)
-			continue;
-
-		__br_multicast_enable_port(port);
-	}
+	br_multicast_start_querier(br, &br->ip4_own_query);
+#if IS_ENABLED(CONFIG_IPV6)
+	br_multicast_start_querier(br, &br->ip6_own_query);
+#endif
 
 unlock:
-	spin_unlock(&br->multicast_lock);
+	spin_unlock_bh(&br->multicast_lock);
 
 	return err;
 }
 
+int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
+{
+	unsigned long max_delay;
+
+	val = !!val;
+
+	spin_lock_bh(&br->multicast_lock);
+	if (br->multicast_querier == val)
+		goto unlock;
+
+	br->multicast_querier = val;
+	if (!val)
+		goto unlock;
+
+	max_delay = br->multicast_query_response_interval;
+
+	if (!timer_pending(&br->ip4_other_query.timer))
+		br->ip4_other_query.delay_time = jiffies + max_delay;
+
+	br_multicast_start_querier(br, &br->ip4_own_query);
+
+#if IS_ENABLED(CONFIG_IPV6)
+	if (!timer_pending(&br->ip6_other_query.timer))
+		br->ip6_other_query.delay_time = jiffies + max_delay;
+
+	br_multicast_start_querier(br, &br->ip6_own_query);
+#endif
+
+unlock:
+	spin_unlock_bh(&br->multicast_lock);
+
+	return 0;
+}
+
 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
 {
 	int err = -ENOENT;
 	u32 old;
+	struct net_bridge_mdb_htable *mdb;
 
-	spin_lock(&br->multicast_lock);
+	spin_lock_bh(&br->multicast_lock);
 	if (!netif_running(br->dev))
 		goto unlock;
 
 	err = -EINVAL;
 	if (!is_power_of_2(val))
 		goto unlock;
-	if (br->mdb && val < br->mdb->size)
+
+	mdb = mlock_dereference(br->mdb, br);
+	if (mdb && val < mdb->size)
 		goto unlock;
 
 	err = 0;
@@ -1288,8 +2138,8 @@ int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
 	old = br->hash_max;
 	br->hash_max = val;
 
-	if (br->mdb) {
-		if (br->mdb->old) {
+	if (mdb) {
+		if (mdb->old) {
 			err = -EEXIST;
 rollback:
 			br->hash_max = old;
@@ -1303,7 +2153,113 @@ rollback:
 	}
 
 unlock:
-	spin_unlock(&br->multicast_lock);
+	spin_unlock_bh(&br->multicast_lock);
 
 	return err;
 }
+
+/**
+ * br_multicast_list_adjacent - Returns snooped multicast addresses
+ * @dev:	The bridge port adjacent to which to retrieve addresses
+ * @br_ip_list:	The list to store found, snooped multicast IP addresses in
+ *
+ * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
+ * snooping feature on all bridge ports of dev's bridge device, excluding
+ * the addresses from dev itself.
+ *
+ * Returns the number of items added to br_ip_list.
+ *
+ * Notes:
+ * - br_ip_list needs to be initialized by caller
+ * - br_ip_list might contain duplicates in the end
+ *   (needs to be taken care of by caller)
+ * - br_ip_list needs to be freed by caller
+ */
+int br_multicast_list_adjacent(struct net_device *dev,
+			       struct list_head *br_ip_list)
+{
+	struct net_bridge *br;
+	struct net_bridge_port *port;
+	struct net_bridge_port_group *group;
+	struct br_ip_list *entry;
+	int count = 0;
+
+	rcu_read_lock();
+	if (!br_ip_list || !br_port_exists(dev))
+		goto unlock;
+
+	port = br_port_get_rcu(dev);
+	if (!port || !port->br)
+		goto unlock;
+
+	br = port->br;
+
+	list_for_each_entry_rcu(port, &br->port_list, list) {
+		if (!port->dev || port->dev == dev)
+			continue;
+
+		hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
+			entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
+			if (!entry)
+				goto unlock;
+
+			entry->addr = group->addr;
+			list_add(&entry->list, br_ip_list);
+			count++;
+		}
+	}
+
+unlock:
+	rcu_read_unlock();
+	return count;
+}
+EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
+
+/**
+ * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
+ * @dev: The bridge port adjacent to which to check for a querier
+ * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
+ *
+ * Checks whether the given interface has a bridge on top and if so returns
+ * true if a selected querier is behind one of the other ports of this
+ * bridge. Otherwise returns false.
+ */
+bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
+{
+	struct net_bridge *br;
+	struct net_bridge_port *port;
+	bool ret = false;
+
+	rcu_read_lock();
+	if (!br_port_exists(dev))
+		goto unlock;
+
+	port = br_port_get_rcu(dev);
+	if (!port || !port->br)
+		goto unlock;
+
+	br = port->br;
+
+	switch (proto) {
+	case ETH_P_IP:
+		if (!timer_pending(&br->ip4_other_query.timer) ||
+		    rcu_dereference(br->ip4_querier.port) == port)
+			goto unlock;
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case ETH_P_IPV6:
+		if (!timer_pending(&br->ip6_other_query.timer) ||
+		    rcu_dereference(br->ip6_querier.port) == port)
+			goto unlock;
+		break;
+#endif
+	default:
+		goto unlock;
+	}
+
+	ret = true;
+unlock:
+	rcu_read_unlock();
+	return ret;
+}
+EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);