Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2651 insertions, 0 deletions

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
new file mode 100644
index 000000000..3504c3acd
--- /dev/null
+++ b/net/bridge/br_multicast.c
@@ -0,0 +1,2651 @@
+/*
+ * Bridge multicast support.
+ *
+ * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/if_ether.h>
+#include <linux/igmp.h>
+#include <linux/jhash.h>
+#include <linux/kernel.h>
+#include <linux/log2.h>
+#include <linux/netdevice.h>
+#include <linux/netfilter_bridge.h>
+#include <linux/random.h>
+#include <linux/rculist.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/timer.h>
+#include <linux/inetdevice.h>
+#include <linux/mroute.h>
+#include <net/ip.h>
+#include <net/switchdev.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 void br_multicast_start_querier(struct net_bridge *br,
+				       struct bridge_mcast_own_query *query);
+static void br_multicast_add_router(struct net_bridge *br,
+				    struct net_bridge_port *port);
+static void br_ip4_multicast_leave_group(struct net_bridge *br,
+					 struct net_bridge_port *port,
+					 __be32 group,
+					 __u16 vid,
+					 const unsigned char *src);
+
+static void __del_port_router(struct net_bridge_port *p);
+#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, const unsigned char *src);
+#endif
+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_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, struct br_ip *dst, int hash)
+{
+	struct net_bridge_mdb_entry *mp;
+
+	hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
+		if (br_ip_equal(&mp->addr, dst))
+			return mp;
+	}
+
+	return NULL;
+}
+
+struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
+					   struct br_ip *dst)
+{
+	if (!mdb)
+		return NULL;
+
+	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, 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):
+		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 br_mdb_ip_get(mdb, &ip);
+}
+
+static void br_mdb_free(struct rcu_head *head)
+{
+	struct net_bridge_mdb_htable *mdb =
+		container_of(head, struct net_bridge_mdb_htable, rcu);
+	struct net_bridge_mdb_htable *old = mdb->old;
+
+	mdb->old = NULL;
+	kfree(old->mhash);
+	kfree(old);
+}
+
+static int br_mdb_copy(struct net_bridge_mdb_htable *new,
+		       struct net_bridge_mdb_htable *old,
+		       int elasticity)
+{
+	struct net_bridge_mdb_entry *mp;
+	int maxlen;
+	int len;
+	int i;
+
+	for (i = 0; i < old->max; i++)
+		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)]);
+
+	if (!elasticity)
+		return 0;
+
+	maxlen = 0;
+	for (i = 0; i < new->max; i++) {
+		len = 0;
+		hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
+			len++;
+		if (len > maxlen)
+			maxlen = len;
+	}
+
+	return maxlen > elasticity ? -EINVAL : 0;
+}
+
+void br_multicast_free_pg(struct rcu_head *head)
+{
+	struct net_bridge_port_group *p =
+		container_of(head, struct net_bridge_port_group, rcu);
+
+	kfree(p);
+}
+
+static void br_multicast_free_group(struct rcu_head *head)
+{
+	struct net_bridge_mdb_entry *mp =
+		container_of(head, struct net_bridge_mdb_entry, rcu);
+
+	kfree(mp);
+}
+
+static void br_multicast_group_expired(struct timer_list *t)
+{
+	struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer);
+	struct net_bridge *br = mp->br;
+	struct net_bridge_mdb_htable *mdb;
+
+	spin_lock(&br->multicast_lock);
+	if (!netif_running(br->dev) || timer_pending(&mp->timer))
+		goto out;
+
+	mp->host_joined = false;
+	br_mdb_notify(br->dev, NULL, &mp->addr, RTM_DELMDB, 0);
+
+	if (mp->ports)
+		goto out;
+
+	mdb = mlock_dereference(br->mdb, br);
+
+	hlist_del_rcu(&mp->hlist[mdb->ver]);
+	mdb->size--;
+
+	call_rcu_bh(&mp->rcu, br_multicast_free_group);
+
+out:
+	spin_unlock(&br->multicast_lock);
+}
+
+static void br_multicast_del_pg(struct net_bridge *br,
+				struct net_bridge_port_group *pg)
+{
+	struct net_bridge_mdb_htable *mdb;
+	struct net_bridge_mdb_entry *mp;
+	struct net_bridge_port_group *p;
+	struct net_bridge_port_group __rcu **pp;
+
+	mdb = mlock_dereference(br->mdb, br);
+
+	mp = br_mdb_ip_get(mdb, &pg->addr);
+	if (WARN_ON(!mp))
+		return;
+
+	for (pp = &mp->ports;
+	     (p = mlock_dereference(*pp, br)) != NULL;
+	     pp = &p->next) {
+		if (p != pg)
+			continue;
+
+		rcu_assign_pointer(*pp, p->next);
+		hlist_del_init(&p->mglist);
+		del_timer(&p->timer);
+		br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
+			      p->flags);
+		call_rcu_bh(&p->rcu, br_multicast_free_pg);
+
+		if (!mp->ports && !mp->host_joined &&
+		    netif_running(br->dev))
+			mod_timer(&mp->timer, jiffies);
+
+		return;
+	}
+
+	WARN_ON(1);
+}
+
+static void br_multicast_port_group_expired(struct timer_list *t)
+{
+	struct net_bridge_port_group *pg = from_timer(pg, t, timer);
+	struct net_bridge *br = pg->port->br;
+
+	spin_lock(&br->multicast_lock);
+	if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
+	    hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
+		goto out;
+
+	br_multicast_del_pg(br, pg);
+
+out:
+	spin_unlock(&br->multicast_lock);
+}
+
+static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
+			 int elasticity)
+{
+	struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
+	struct net_bridge_mdb_htable *mdb;
+	int err;
+
+	mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
+	if (!mdb)
+		return -ENOMEM;
+
+	mdb->max = max;
+	mdb->old = old;
+
+	mdb->mhash = kcalloc(max, sizeof(*mdb->mhash), GFP_ATOMIC);
+	if (!mdb->mhash) {
+		kfree(mdb);
+		return -ENOMEM;
+	}
+
+	mdb->size = old ? old->size : 0;
+	mdb->ver = old ? old->ver ^ 1 : 0;
+
+	if (!old || elasticity)
+		get_random_bytes(&mdb->secret, sizeof(mdb->secret));
+	else
+		mdb->secret = old->secret;
+
+	if (!old)
+		goto out;
+
+	err = br_mdb_copy(mdb, old, elasticity);
+	if (err) {
+		kfree(mdb->mhash);
+		kfree(mdb);
+		return err;
+	}
+
+	br_mdb_rehash_seq++;
+	call_rcu_bh(&mdb->rcu, br_mdb_free);
+
+out:
+	rcu_assign_pointer(*mdbp, mdb);
+
+	return 0;
+}
+
+static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
+						    __be32 group,
+						    u8 *igmp_type)
+{
+	struct igmpv3_query *ihv3;
+	size_t igmp_hdr_size;
+	struct sk_buff *skb;
+	struct igmphdr *ih;
+	struct ethhdr *eth;
+	struct iphdr *iph;
+
+	igmp_hdr_size = sizeof(*ih);
+	if (br->multicast_igmp_version == 3)
+		igmp_hdr_size = sizeof(*ihv3);
+	skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
+						 igmp_hdr_size + 4);
+	if (!skb)
+		goto out;
+
+	skb->protocol = htons(ETH_P_IP);
+
+	skb_reset_mac_header(skb);
+	eth = eth_hdr(skb);
+
+	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;
+	eth->h_dest[3] = 0;
+	eth->h_dest[4] = 0;
+	eth->h_dest[5] = 1;
+	eth->h_proto = htons(ETH_P_IP);
+	skb_put(skb, sizeof(*eth));
+
+	skb_set_network_header(skb, skb->len);
+	iph = ip_hdr(skb);
+
+	iph->version = 4;
+	iph->ihl = 6;
+	iph->tos = 0xc0;
+	iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4);
+	iph->id = 0;
+	iph->frag_off = htons(IP_DF);
+	iph->ttl = 1;
+	iph->protocol = IPPROTO_IGMP;
+	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;
+	((u8 *)&iph[1])[2] = 0;
+	((u8 *)&iph[1])[3] = 0;
+	ip_send_check(iph);
+	skb_put(skb, 24);
+
+	skb_set_transport_header(skb, skb->len);
+	*igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
+
+	switch (br->multicast_igmp_version) {
+	case 2:
+		ih = igmp_hdr(skb);
+		ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
+		ih->code = (group ? br->multicast_last_member_interval :
+				    br->multicast_query_response_interval) /
+			   (HZ / IGMP_TIMER_SCALE);
+		ih->group = group;
+		ih->csum = 0;
+		ih->csum = ip_compute_csum((void *)ih, sizeof(*ih));
+		break;
+	case 3:
+		ihv3 = igmpv3_query_hdr(skb);
+		ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
+		ihv3->code = (group ? br->multicast_last_member_interval :
+				      br->multicast_query_response_interval) /
+			     (HZ / IGMP_TIMER_SCALE);
+		ihv3->group = group;
+		ihv3->qqic = br->multicast_query_interval / HZ;
+		ihv3->nsrcs = 0;
+		ihv3->resv = 0;
+		ihv3->suppress = 0;
+		ihv3->qrv = 2;
+		ihv3->csum = 0;
+		ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3));
+		break;
+	}
+
+	skb_put(skb, igmp_hdr_size);
+	__skb_pull(skb, sizeof(*eth));
+
+out:
+	return skb;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
+						    const struct in6_addr *grp,
+						    u8 *igmp_type)
+{
+	struct mld2_query *mld2q;
+	unsigned long interval;
+	struct ipv6hdr *ip6h;
+	struct mld_msg *mldq;
+	size_t mld_hdr_size;
+	struct sk_buff *skb;
+	struct ethhdr *eth;
+	u8 *hopopt;
+
+	mld_hdr_size = sizeof(*mldq);
+	if (br->multicast_mld_version == 2)
+		mld_hdr_size = sizeof(*mld2q);
+	skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
+						 8 + mld_hdr_size);
+	if (!skb)
+		goto out;
+
+	skb->protocol = htons(ETH_P_IPV6);
+
+	/* Ethernet header */
+	skb_reset_mac_header(skb);
+	eth = eth_hdr(skb);
+
+	ether_addr_copy(eth->h_source, br->dev->dev_addr);
+	eth->h_proto = htons(ETH_P_IPV6);
+	skb_put(skb, sizeof(*eth));
+
+	/* 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 + mld_hdr_size);
+	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);
+		br->has_ipv6_addr = 0;
+		return NULL;
+	}
+
+	br->has_ipv6_addr = 1;
+	ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
+
+	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 */
+
+	skb_put(skb, sizeof(*ip6h) + 8);
+
+	/* ICMPv6 */
+	skb_set_transport_header(skb, skb->len);
+	interval = ipv6_addr_any(grp) ?
+			br->multicast_query_response_interval :
+			br->multicast_last_member_interval;
+	*igmp_type = ICMPV6_MGM_QUERY;
+	switch (br->multicast_mld_version) {
+	case 1:
+		mldq = (struct mld_msg *)icmp6_hdr(skb);
+		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 = *grp;
+		mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
+						  sizeof(*mldq), IPPROTO_ICMPV6,
+						  csum_partial(mldq,
+							       sizeof(*mldq),
+							       0));
+		break;
+	case 2:
+		mld2q = (struct mld2_query *)icmp6_hdr(skb);
+		mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
+		mld2q->mld2q_type = ICMPV6_MGM_QUERY;
+		mld2q->mld2q_code = 0;
+		mld2q->mld2q_cksum = 0;
+		mld2q->mld2q_resv1 = 0;
+		mld2q->mld2q_resv2 = 0;
+		mld2q->mld2q_suppress = 0;
+		mld2q->mld2q_qrv = 2;
+		mld2q->mld2q_nsrcs = 0;
+		mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
+		mld2q->mld2q_mca = *grp;
+		mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
+						     sizeof(*mld2q),
+						     IPPROTO_ICMPV6,
+						     csum_partial(mld2q,
+								  sizeof(*mld2q),
+								  0));
+		break;
+	}
+	skb_put(skb, mld_hdr_size);
+
+	__skb_pull(skb, sizeof(*eth));
+
+out:
+	return skb;
+}
+#endif
+
+static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
+						struct br_ip *addr,
+						u8 *igmp_type)
+{
+	switch (addr->proto) {
+	case htons(ETH_P_IP):
+		return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
+#if IS_ENABLED(CONFIG_IPV6)
+	case htons(ETH_P_IPV6):
+		return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
+						    igmp_type);
+#endif
+	}
+	return NULL;
+}
+
+static struct net_bridge_mdb_entry *br_multicast_get_group(
+	struct net_bridge *br, struct net_bridge_port *port,
+	struct br_ip *group, int hash)
+{
+	struct net_bridge_mdb_htable *mdb;
+	struct net_bridge_mdb_entry *mp;
+	unsigned int count = 0;
+	unsigned int max;
+	int elasticity;
+	int err;
+
+	mdb = rcu_dereference_protected(br->mdb, 1);
+	hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
+		count++;
+		if (unlikely(br_ip_equal(group, &mp->addr)))
+			return mp;
+	}
+
+	elasticity = 0;
+	max = mdb->max;
+
+	if (unlikely(count > br->hash_elasticity && count)) {
+		if (net_ratelimit())
+			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)) {
+			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;
+			goto err;
+		}
+	}
+
+	if (max > mdb->max || elasticity) {
+		if (mdb->old) {
+			if (net_ratelimit())
+				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) {
+			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;
+		}
+
+		err = -EAGAIN;
+		goto err;
+	}
+
+	return NULL;
+
+err:
+	mp = ERR_PTR(err);
+	return mp;
+}
+
+struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
+						    struct net_bridge_port *p,
+						    struct br_ip *group)
+{
+	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) {
+		err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
+		if (err)
+			return ERR_PTR(err);
+		goto rehash;
+	}
+
+	hash = br_ip_hash(mdb, group);
+	mp = br_multicast_get_group(br, p, group, hash);
+	switch (PTR_ERR(mp)) {
+	case 0:
+		break;
+
+	case -EAGAIN:
+rehash:
+		mdb = rcu_dereference_protected(br->mdb, 1);
+		hash = br_ip_hash(mdb, group);
+		break;
+
+	default:
+		goto out;
+	}
+
+	mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
+	if (unlikely(!mp))
+		return ERR_PTR(-ENOMEM);
+
+	mp->br = br;
+	mp->addr = *group;
+	timer_setup(&mp->timer, br_multicast_group_expired, 0);
+
+	hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
+	mdb->size++;
+
+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 flags,
+			const unsigned char *src)
+{
+	struct net_bridge_port_group *p;
+
+	p = kzalloc(sizeof(*p), GFP_ATOMIC);
+	if (unlikely(!p))
+		return NULL;
+
+	p->addr = *group;
+	p->port = port;
+	p->flags = flags;
+	rcu_assign_pointer(p->next, next);
+	hlist_add_head(&p->mglist, &port->mglist);
+	timer_setup(&p->timer, br_multicast_port_group_expired, 0);
+
+	if (src)
+		memcpy(p->eth_addr, src, ETH_ALEN);
+	else
+		memset(p->eth_addr, 0xff, ETH_ALEN);
+
+	return p;
+}
+
+static bool br_port_group_equal(struct net_bridge_port_group *p,
+				struct net_bridge_port *port,
+				const unsigned char *src)
+{
+	if (p->port != port)
+		return false;
+
+	if (!(port->flags & BR_MULTICAST_TO_UNICAST))
+		return true;
+
+	return ether_addr_equal(src, p->eth_addr);
+}
+
+static int br_multicast_add_group(struct net_bridge *br,
+				  struct net_bridge_port *port,
+				  struct br_ip *group,
+				  const unsigned char *src)
+{
+	struct net_bridge_port_group __rcu **pp;
+	struct net_bridge_port_group *p;
+	struct net_bridge_mdb_entry *mp;
+	unsigned long now = jiffies;
+	int err;
+
+	spin_lock(&br->multicast_lock);
+	if (!netif_running(br->dev) ||
+	    (port && port->state == BR_STATE_DISABLED))
+		goto out;
+
+	mp = br_multicast_new_group(br, port, group);
+	err = PTR_ERR(mp);
+	if (IS_ERR(mp))
+		goto err;
+
+	if (!port) {
+		if (!mp->host_joined) {
+			mp->host_joined = true;
+			br_mdb_notify(br->dev, NULL, &mp->addr, RTM_NEWMDB, 0);
+		}
+		mod_timer(&mp->timer, now + br->multicast_membership_interval);
+		goto out;
+	}
+
+	for (pp = &mp->ports;
+	     (p = mlock_dereference(*pp, br)) != NULL;
+	     pp = &p->next) {
+		if (br_port_group_equal(p, port, src))
+			goto found;
+		if ((unsigned long)p->port < (unsigned long)port)
+			break;
+	}
+
+	p = br_multicast_new_port_group(port, group, *pp, 0, src);
+	if (unlikely(!p))
+		goto err;
+	rcu_assign_pointer(*pp, p);
+	br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
+
+found:
+	mod_timer(&p->timer, now + br->multicast_membership_interval);
+out:
+	err = 0;
+
+err:
+	spin_unlock(&br->multicast_lock);
+	return err;
+}
+
+static int br_ip4_multicast_add_group(struct net_bridge *br,
+				      struct net_bridge_port *port,
+				      __be32 group,
+				      __u16 vid,
+				      const unsigned char *src)
+{
+	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, src);
+}
+
+#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,
+				      const unsigned char *src)
+{
+	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, src);
+}
+#endif
+
+static void br_multicast_router_expired(struct timer_list *t)
+{
+	struct net_bridge_port *port =
+			from_timer(port, t, multicast_router_timer);
+	struct net_bridge *br = port->br;
+
+	spin_lock(&br->multicast_lock);
+	if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
+	    port->multicast_router == MDB_RTR_TYPE_PERM ||
+	    timer_pending(&port->multicast_router_timer))
+		goto out;
+
+	__del_port_router(port);
+out:
+	spin_unlock(&br->multicast_lock);
+}
+
+static void br_mc_router_state_change(struct net_bridge *p,
+				      bool is_mc_router)
+{
+	struct switchdev_attr attr = {
+		.orig_dev = p->dev,
+		.id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
+		.flags = SWITCHDEV_F_DEFER,
+		.u.mrouter = is_mc_router,
+	};
+
+	switchdev_port_attr_set(p->dev, &attr);
+}
+
+static void br_multicast_local_router_expired(struct timer_list *t)
+{
+	struct net_bridge *br = from_timer(br, t, multicast_router_timer);
+
+	spin_lock(&br->multicast_lock);
+	if (br->multicast_router == MDB_RTR_TYPE_DISABLED ||
+	    br->multicast_router == MDB_RTR_TYPE_PERM ||
+	    timer_pending(&br->multicast_router_timer))
+		goto out;
+
+	br_mc_router_state_change(br, false);
+out:
+	spin_unlock(&br->multicast_lock);
+}
+
+static void br_multicast_querier_expired(struct net_bridge *br,
+					 struct bridge_mcast_own_query *query)
+{
+	spin_lock(&br->multicast_lock);
+	if (!netif_running(br->dev) || br->multicast_disabled)
+		goto out;
+
+	br_multicast_start_querier(br, query);
+
+out:
+	spin_unlock(&br->multicast_lock);
+}
+
+static void br_ip4_multicast_querier_expired(struct timer_list *t)
+{
+	struct net_bridge *br = from_timer(br, t, ip4_other_query.timer);
+
+	br_multicast_querier_expired(br, &br->ip4_own_query);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static void br_ip6_multicast_querier_expired(struct timer_list *t)
+{
+	struct net_bridge *br = from_timer(br, t, ip6_other_query.timer);
+
+	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;
+	u8 igmp_type;
+
+	skb = br_multicast_alloc_query(br, ip, &igmp_type);
+	if (!skb)
+		return;
+
+	if (port) {
+		skb->dev = port->dev;
+		br_multicast_count(br, port, skb, igmp_type,
+				   BR_MCAST_DIR_TX);
+		NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
+			dev_net(port->dev), NULL, skb, NULL, skb->dev,
+			br_dev_queue_push_xmit);
+	} else {
+		br_multicast_select_own_querier(br, ip, skb);
+		br_multicast_count(br, port, skb, igmp_type,
+				   BR_MCAST_DIR_RX);
+		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)
+{
+	struct bridge_mcast_other_query *other_query = NULL;
+	struct br_ip br_group;
+	unsigned long time;
+
+	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);
+
+	time = jiffies;
+	time += own_query->startup_sent < br->multicast_startup_query_count ?
+		br->multicast_startup_query_interval :
+		br->multicast_query_interval;
+	mod_timer(&own_query->timer, time);
+}
+
+static void
+br_multicast_port_query_expired(struct net_bridge_port *port,
+				struct bridge_mcast_own_query *query)
+{
+	struct net_bridge *br = port->br;
+
+	spin_lock(&br->multicast_lock);
+	if (port->state == BR_STATE_DISABLED ||
+	    port->state == BR_STATE_BLOCKING)
+		goto out;
+
+	if (query->startup_sent < br->multicast_startup_query_count)
+		query->startup_sent++;
+
+	br_multicast_send_query(port->br, port, query);
+
+out:
+	spin_unlock(&br->multicast_lock);
+}
+
+static void br_ip4_multicast_port_query_expired(struct timer_list *t)
+{
+	struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer);
+
+	br_multicast_port_query_expired(port, &port->ip4_own_query);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static void br_ip6_multicast_port_query_expired(struct timer_list *t)
+{
+	struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer);
+
+	br_multicast_port_query_expired(port, &port->ip6_own_query);
+}
+#endif
+
+static void br_mc_disabled_update(struct net_device *dev, bool value)
+{
+	struct switchdev_attr attr = {
+		.orig_dev = dev,
+		.id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
+		.flags = SWITCHDEV_F_DEFER,
+		.u.mc_disabled = value,
+	};
+
+	switchdev_port_attr_set(dev, &attr);
+}
+
+int br_multicast_add_port(struct net_bridge_port *port)
+{
+	port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
+
+	timer_setup(&port->multicast_router_timer,
+		    br_multicast_router_expired, 0);
+	timer_setup(&port->ip4_own_query.timer,
+		    br_ip4_multicast_port_query_expired, 0);
+#if IS_ENABLED(CONFIG_IPV6)
+	timer_setup(&port->ip6_own_query.timer,
+		    br_ip6_multicast_port_query_expired, 0);
+#endif
+	br_mc_disabled_update(port->dev, port->br->multicast_disabled);
+
+	port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
+	if (!port->mcast_stats)
+		return -ENOMEM;
+
+	return 0;
+}
+
+void br_multicast_del_port(struct net_bridge_port *port)
+{
+	struct net_bridge *br = port->br;
+	struct net_bridge_port_group *pg;
+	struct hlist_node *n;
+
+	/* Take care of the remaining groups, only perm ones should be left */
+	spin_lock_bh(&br->multicast_lock);
+	hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
+		br_multicast_del_pg(br, pg);
+	spin_unlock_bh(&br->multicast_lock);
+	del_timer_sync(&port->multicast_router_timer);
+	free_percpu(port->mcast_stats);
+}
+
+static void br_multicast_enable(struct bridge_mcast_own_query *query)
+{
+	query->startup_sent = 0;
+
+	if (try_to_del_timer_sync(&query->timer) >= 0 ||
+	    del_timer(&query->timer))
+		mod_timer(&query->timer, jiffies);
+}
+
+static void __br_multicast_enable_port(struct net_bridge_port *port)
+{
+	struct net_bridge *br = port->br;
+
+	if (br->multicast_disabled || !netif_running(br->dev))
+		return;
+
+	br_multicast_enable(&port->ip4_own_query);
+#if IS_ENABLED(CONFIG_IPV6)
+	br_multicast_enable(&port->ip6_own_query);
+#endif
+	if (port->multicast_router == MDB_RTR_TYPE_PERM &&
+	    hlist_unhashed(&port->rlist))
+		br_multicast_add_router(br, port);
+}
+
+void br_multicast_enable_port(struct net_bridge_port *port)
+{
+	struct net_bridge *br = port->br;
+
+	spin_lock(&br->multicast_lock);
+	__br_multicast_enable_port(port);
+	spin_unlock(&br->multicast_lock);
+}
+
+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 *n;
+
+	spin_lock(&br->multicast_lock);
+	hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
+		if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
+			br_multicast_del_pg(br, pg);
+
+	__del_port_router(port);
+
+	del_timer(&port->multicast_router_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_ip4_multicast_igmp3_report(struct net_bridge *br,
+					 struct net_bridge_port *port,
+					 struct sk_buff *skb,
+					 u16 vid)
+{
+	const unsigned char *src;
+	struct igmpv3_report *ih;
+	struct igmpv3_grec *grec;
+	int i;
+	int len;
+	int num;
+	int type;
+	int err = 0;
+	__be32 group;
+	u16 nsrcs;
+
+	ih = igmpv3_report_hdr(skb);
+	num = ntohs(ih->ngrec);
+	len = skb_transport_offset(skb) + sizeof(*ih);
+
+	for (i = 0; i < num; i++) {
+		len += sizeof(*grec);
+		if (!pskb_may_pull(skb, len))
+			return -EINVAL;
+
+		grec = (void *)(skb->data + len - sizeof(*grec));
+		group = grec->grec_mca;
+		type = grec->grec_type;
+		nsrcs = ntohs(grec->grec_nsrcs);
+
+		len += nsrcs * 4;
+		if (!pskb_may_pull(skb, len))
+			return -EINVAL;
+
+		/* We treat this as an IGMPv2 report for now. */
+		switch (type) {
+		case IGMPV3_MODE_IS_INCLUDE:
+		case IGMPV3_MODE_IS_EXCLUDE:
+		case IGMPV3_CHANGE_TO_INCLUDE:
+		case IGMPV3_CHANGE_TO_EXCLUDE:
+		case IGMPV3_ALLOW_NEW_SOURCES:
+		case IGMPV3_BLOCK_OLD_SOURCES:
+			break;
+
+		default:
+			continue;
+		}
+
+		src = eth_hdr(skb)->h_source;
+		if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
+		     type == IGMPV3_MODE_IS_INCLUDE) &&
+		    nsrcs == 0) {
+			br_ip4_multicast_leave_group(br, port, group, vid, src);
+		} else {
+			err = br_ip4_multicast_add_group(br, port, group, vid,
+							 src);
+			if (err)
+				break;
+		}
+	}
+
+	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)
+{
+	const unsigned char *src;
+	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 = skb_transport_offset(skb) + sizeof(*icmp6h);
+
+	for (i = 0; i < num; i++) {
+		__be16 *_nsrcs, __nsrcs;
+		u16 nsrcs;
+
+		_nsrcs = skb_header_pointer(skb,
+					    len + offsetof(struct mld2_grec,
+							   grec_nsrcs),
+					    sizeof(__nsrcs), &__nsrcs);
+		if (!_nsrcs)
+			return -EINVAL;
+
+		nsrcs = ntohs(*_nsrcs);
+
+		if (!pskb_may_pull(skb,
+				   len + sizeof(*grec) +
+				   sizeof(struct in6_addr) * nsrcs))
+			return -EINVAL;
+
+		grec = (struct mld2_grec *)(skb->data + len);
+		len += sizeof(*grec) +
+		       sizeof(struct in6_addr) * 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;
+		}
+
+		src = eth_hdr(skb)->h_source;
+		if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
+		     grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
+		    nsrcs == 0) {
+			br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
+						     vid, src);
+		} else {
+			err = br_ip6_multicast_add_group(br, port,
+							 &grec->grec_mca, vid,
+							 src);
+			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);
+}
+
+static void br_port_mc_router_state_change(struct net_bridge_port *p,
+					   bool is_mc_router)
+{
+	struct switchdev_attr attr = {
+		.orig_dev = p->dev,
+		.id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
+		.flags = SWITCHDEV_F_DEFER,
+		.u.mrouter = is_mc_router,
+	};
+
+	switchdev_port_attr_set(p->dev, &attr);
+}
+
+/*
+ * 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 net_bridge_port *p;
+	struct hlist_node *slot = NULL;
+
+	if (!hlist_unhashed(&port->rlist))
+		return;
+
+	hlist_for_each_entry(p, &br->router_list, rlist) {
+		if ((unsigned long) port >= (unsigned long) p)
+			break;
+		slot = &p->rlist;
+	}
+
+	if (slot)
+		hlist_add_behind_rcu(&port->rlist, slot);
+	else
+		hlist_add_head_rcu(&port->rlist, &br->router_list);
+	br_rtr_notify(br->dev, port, RTM_NEWMDB);
+	br_port_mc_router_state_change(port, true);
+}
+
+static void br_multicast_mark_router(struct net_bridge *br,
+				     struct net_bridge_port *port)
+{
+	unsigned long now = jiffies;
+
+	if (!port) {
+		if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
+			if (!timer_pending(&br->multicast_router_timer))
+				br_mc_router_state_change(br, true);
+			mod_timer(&br->multicast_router_timer,
+				  now + br->multicast_querier_interval);
+		}
+		return;
+	}
+
+	if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
+	    port->multicast_router == MDB_RTR_TYPE_PERM)
+		return;
+
+	br_multicast_add_router(br, port);
+
+	mod_timer(&port->multicast_router_timer,
+		  now + br->multicast_querier_interval);
+}
+
+static void br_multicast_query_received(struct net_bridge *br,
+					struct net_bridge_port *port,
+					struct bridge_mcast_other_query *query,
+					struct br_ip *saddr,
+					unsigned long max_delay)
+{
+	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 void br_ip4_multicast_query(struct net_bridge *br,
+				   struct net_bridge_port *port,
+				   struct sk_buff *skb,
+				   u16 vid)
+{
+	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 __rcu **pp;
+	struct br_ip saddr;
+	unsigned long max_delay;
+	unsigned long now = jiffies;
+	unsigned int offset = skb_transport_offset(skb);
+	__be32 group;
+
+	spin_lock(&br->multicast_lock);
+	if (!netif_running(br->dev) ||
+	    (port && port->state == BR_STATE_DISABLED))
+		goto out;
+
+	group = ih->group;
+
+	if (skb->len == offset + sizeof(*ih)) {
+		max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
+
+		if (!max_delay) {
+			max_delay = 10 * HZ;
+			group = 0;
+		}
+	} else if (skb->len >= offset + sizeof(*ih3)) {
+		ih3 = igmpv3_query_hdr(skb);
+		if (ih3->nsrcs)
+			goto out;
+
+		max_delay = ih3->code ?
+			    IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
+	} else {
+		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_ip4_get(mlock_dereference(br->mdb, br), group, vid);
+	if (!mp)
+		goto out;
+
+	max_delay *= br->multicast_last_member_count;
+
+	if (mp->host_joined &&
+	    (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);
+}
+
+#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)
+{
+	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;
+	unsigned int offset = skb_transport_offset(skb);
+	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;
+
+	if (skb->len == offset + sizeof(*mld)) {
+		if (!pskb_may_pull(skb, offset + 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, offset + 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);
+
+	if (is_general_query) {
+		saddr.proto = htons(ETH_P_IPV6);
+		saddr.u.ip6 = ipv6_hdr(skb)->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->host_joined &&
+	    (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,
+			 const unsigned char *src)
+{
+	struct net_bridge_mdb_htable *mdb;
+	struct net_bridge_mdb_entry *mp;
+	struct net_bridge_port_group *p;
+	unsigned long now;
+	unsigned long time;
+
+	spin_lock(&br->multicast_lock);
+	if (!netif_running(br->dev) ||
+	    (port && port->state == BR_STATE_DISABLED))
+		goto out;
+
+	mdb = mlock_dereference(br->mdb, br);
+	mp = br_mdb_ip_get(mdb, group);
+	if (!mp)
+		goto out;
+
+	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 (!br_port_group_equal(p, port, src))
+				continue;
+
+			if (p->flags & MDB_PG_FLAGS_PERMANENT)
+				break;
+
+			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,
+				      p->flags);
+
+			if (!mp->ports && !mp->host_joined &&
+			    netif_running(br->dev))
+				mod_timer(&mp->timer, jiffies);
+		}
+		goto out;
+	}
+
+	if (timer_pending(&other_query->timer))
+		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 (!br_port_group_equal(p, port, src))
+				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;
+		}
+	}
+
+	now = jiffies;
+	time = now + br->multicast_last_member_count *
+		     br->multicast_last_member_interval;
+
+	if (!port) {
+		if (mp->host_joined &&
+		    (timer_pending(&mp->timer) ?
+		     time_after(mp->timer.expires, time) :
+		     try_to_del_timer_sync(&mp->timer) >= 0)) {
+			mod_timer(&mp->timer, time);
+		}
+
+		goto out;
+	}
+
+	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;
+	}
+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,
+					 const unsigned char *src)
+{
+	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, src);
+}
+
+#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,
+					 const unsigned char *src)
+{
+	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, src);
+}
+#endif
+
+static void br_multicast_err_count(const struct net_bridge *br,
+				   const struct net_bridge_port *p,
+				   __be16 proto)
+{
+	struct bridge_mcast_stats __percpu *stats;
+	struct bridge_mcast_stats *pstats;
+
+	if (!br->multicast_stats_enabled)
+		return;
+
+	if (p)
+		stats = p->mcast_stats;
+	else
+		stats = br->mcast_stats;
+	if (WARN_ON(!stats))
+		return;
+
+	pstats = this_cpu_ptr(stats);
+
+	u64_stats_update_begin(&pstats->syncp);
+	switch (proto) {
+	case htons(ETH_P_IP):
+		pstats->mstats.igmp_parse_errors++;
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case htons(ETH_P_IPV6):
+		pstats->mstats.mld_parse_errors++;
+		break;
+#endif
+	}
+	u64_stats_update_end(&pstats->syncp);
+}
+
+static void br_multicast_pim(struct net_bridge *br,
+			     struct net_bridge_port *port,
+			     const struct sk_buff *skb)
+{
+	unsigned int offset = skb_transport_offset(skb);
+	struct pimhdr *pimhdr, _pimhdr;
+
+	pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
+	if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
+	    pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
+		return;
+
+	spin_lock(&br->multicast_lock);
+	br_multicast_mark_router(br, port);
+	spin_unlock(&br->multicast_lock);
+}
+
+static int br_multicast_ipv4_rcv(struct net_bridge *br,
+				 struct net_bridge_port *port,
+				 struct sk_buff *skb,
+				 u16 vid)
+{
+	struct sk_buff *skb_trimmed = NULL;
+	const unsigned char *src;
+	struct igmphdr *ih;
+	int err;
+
+	err = ip_mc_check_igmp(skb, &skb_trimmed);
+
+	if (err == -ENOMSG) {
+		if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
+			BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
+		} else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
+			if (ip_hdr(skb)->protocol == IPPROTO_PIM)
+				br_multicast_pim(br, port, skb);
+		}
+		return 0;
+	} else if (err < 0) {
+		br_multicast_err_count(br, port, skb->protocol);
+		return err;
+	}
+
+	ih = igmp_hdr(skb);
+	src = eth_hdr(skb)->h_source;
+	BR_INPUT_SKB_CB(skb)->igmp = ih->type;
+
+	switch (ih->type) {
+	case IGMP_HOST_MEMBERSHIP_REPORT:
+	case IGMPV2_HOST_MEMBERSHIP_REPORT:
+		BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
+		err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
+		break;
+	case IGMPV3_HOST_MEMBERSHIP_REPORT:
+		err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
+		break;
+	case IGMP_HOST_MEMBERSHIP_QUERY:
+		br_ip4_multicast_query(br, port, skb_trimmed, vid);
+		break;
+	case IGMP_HOST_LEAVE_MESSAGE:
+		br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
+		break;
+	}
+
+	if (skb_trimmed && skb_trimmed != skb)
+		kfree_skb(skb_trimmed);
+
+	br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
+			   BR_MCAST_DIR_RX);
+
+	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 *skb_trimmed = NULL;
+	const unsigned char *src;
+	struct mld_msg *mld;
+	int err;
+
+	err = ipv6_mc_check_mld(skb, &skb_trimmed);
+
+	if (err == -ENOMSG) {
+		if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
+			BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
+		return 0;
+	} else if (err < 0) {
+		br_multicast_err_count(br, port, skb->protocol);
+		return err;
+	}
+
+	mld = (struct mld_msg *)skb_transport_header(skb);
+	BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
+
+	switch (mld->mld_type) {
+	case ICMPV6_MGM_REPORT:
+		src = eth_hdr(skb)->h_source;
+		BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
+		err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
+						 src);
+		break;
+	case ICMPV6_MLD2_REPORT:
+		err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
+		break;
+	case ICMPV6_MGM_QUERY:
+		err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
+		break;
+	case ICMPV6_MGM_REDUCTION:
+		src = eth_hdr(skb)->h_source;
+		br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
+		break;
+	}
+
+	if (skb_trimmed && skb_trimmed != skb)
+		kfree_skb(skb_trimmed);
+
+	br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
+			   BR_MCAST_DIR_RX);
+
+	return err;
+}
+#endif
+
+int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
+		     struct sk_buff *skb, u16 vid)
+{
+	int ret = 0;
+
+	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):
+		ret = br_multicast_ipv4_rcv(br, port, skb, vid);
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case htons(ETH_P_IPV6):
+		ret = br_multicast_ipv6_rcv(br, port, skb, vid);
+		break;
+#endif
+	}
+
+	return ret;
+}
+
+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_INIT_POINTER(querier->port, NULL);
+	br_multicast_send_query(br, NULL, query);
+	spin_unlock(&br->multicast_lock);
+}
+
+static void br_ip4_multicast_query_expired(struct timer_list *t)
+{
+	struct net_bridge *br = from_timer(br, t, ip4_own_query.timer);
+
+	br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static void br_ip6_multicast_query_expired(struct timer_list *t)
+{
+	struct net_bridge *br = from_timer(br, t, ip6_own_query.timer);
+
+	br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
+}
+#endif
+
+void br_multicast_init(struct net_bridge *br)
+{
+	br->hash_elasticity = 4;
+	br->hash_max = 512;
+
+	br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
+	br->multicast_querier = 0;
+	br->multicast_query_use_ifaddr = 0;
+	br->multicast_last_member_count = 2;
+	br->multicast_startup_query_count = 2;
+
+	br->multicast_last_member_interval = HZ;
+	br->multicast_query_response_interval = 10 * HZ;
+	br->multicast_startup_query_interval = 125 * HZ / 4;
+	br->multicast_query_interval = 125 * HZ;
+	br->multicast_querier_interval = 255 * HZ;
+	br->multicast_membership_interval = 260 * HZ;
+
+	br->ip4_other_query.delay_time = 0;
+	br->ip4_querier.port = NULL;
+	br->multicast_igmp_version = 2;
+#if IS_ENABLED(CONFIG_IPV6)
+	br->multicast_mld_version = 1;
+	br->ip6_other_query.delay_time = 0;
+	br->ip6_querier.port = NULL;
+#endif
+	br->has_ipv6_addr = 1;
+
+	spin_lock_init(&br->multicast_lock);
+	timer_setup(&br->multicast_router_timer,
+		    br_multicast_local_router_expired, 0);
+	timer_setup(&br->ip4_other_query.timer,
+		    br_ip4_multicast_querier_expired, 0);
+	timer_setup(&br->ip4_own_query.timer,
+		    br_ip4_multicast_query_expired, 0);
+#if IS_ENABLED(CONFIG_IPV6)
+	timer_setup(&br->ip6_other_query.timer,
+		    br_ip6_multicast_querier_expired, 0);
+	timer_setup(&br->ip6_own_query.timer,
+		    br_ip6_multicast_query_expired, 0);
+#endif
+}
+
+static void __br_multicast_open(struct net_bridge *br,
+				struct bridge_mcast_own_query *query)
+{
+	query->startup_sent = 0;
+
+	if (br->multicast_disabled)
+		return;
+
+	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)
+{
+	del_timer_sync(&br->multicast_router_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
+}
+
+void br_multicast_dev_del(struct net_bridge *br)
+{
+	struct net_bridge_mdb_htable *mdb;
+	struct net_bridge_mdb_entry *mp;
+	struct hlist_node *n;
+	u32 ver;
+	int i;
+
+	spin_lock_bh(&br->multicast_lock);
+	mdb = mlock_dereference(br->mdb, br);
+	if (!mdb)
+		goto out;
+
+	br->mdb = NULL;
+
+	ver = mdb->ver;
+	for (i = 0; i < mdb->max; i++) {
+		hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
+					  hlist[ver]) {
+			del_timer(&mp->timer);
+			call_rcu_bh(&mp->rcu, br_multicast_free_group);
+		}
+	}
+
+	if (mdb->old) {
+		spin_unlock_bh(&br->multicast_lock);
+		rcu_barrier_bh();
+		spin_lock_bh(&br->multicast_lock);
+		WARN_ON(mdb->old);
+	}
+
+	mdb->old = mdb;
+	call_rcu_bh(&mdb->rcu, br_mdb_free);
+
+out:
+	spin_unlock_bh(&br->multicast_lock);
+}
+
+int br_multicast_set_router(struct net_bridge *br, unsigned long val)
+{
+	int err = -EINVAL;
+
+	spin_lock_bh(&br->multicast_lock);
+
+	switch (val) {
+	case MDB_RTR_TYPE_DISABLED:
+	case MDB_RTR_TYPE_PERM:
+		br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM);
+		del_timer(&br->multicast_router_timer);
+		br->multicast_router = val;
+		err = 0;
+		break;
+	case MDB_RTR_TYPE_TEMP_QUERY:
+		if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
+			br_mc_router_state_change(br, false);
+		br->multicast_router = val;
+		err = 0;
+		break;
+	}
+
+	spin_unlock_bh(&br->multicast_lock);
+
+	return err;
+}
+
+static void __del_port_router(struct net_bridge_port *p)
+{
+	if (hlist_unhashed(&p->rlist))
+		return;
+	hlist_del_init_rcu(&p->rlist);
+	br_rtr_notify(p->br->dev, p, RTM_DELMDB);
+	br_port_mc_router_state_change(p, false);
+
+	/* don't allow timer refresh */
+	if (p->multicast_router == MDB_RTR_TYPE_TEMP)
+		p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
+}
+
+int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
+{
+	struct net_bridge *br = p->br;
+	unsigned long now = jiffies;
+	int err = -EINVAL;
+
+	spin_lock(&br->multicast_lock);
+	if (p->multicast_router == val) {
+		/* Refresh the temp router port timer */
+		if (p->multicast_router == MDB_RTR_TYPE_TEMP)
+			mod_timer(&p->multicast_router_timer,
+				  now + br->multicast_querier_interval);
+		err = 0;
+		goto unlock;
+	}
+	switch (val) {
+	case MDB_RTR_TYPE_DISABLED:
+		p->multicast_router = MDB_RTR_TYPE_DISABLED;
+		__del_port_router(p);
+		del_timer(&p->multicast_router_timer);
+		break;
+	case MDB_RTR_TYPE_TEMP_QUERY:
+		p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
+		__del_port_router(p);
+		break;
+	case MDB_RTR_TYPE_PERM:
+		p->multicast_router = MDB_RTR_TYPE_PERM;
+		del_timer(&p->multicast_router_timer);
+		br_multicast_add_router(br, p);
+		break;
+	case MDB_RTR_TYPE_TEMP:
+		p->multicast_router = MDB_RTR_TYPE_TEMP;
+		br_multicast_mark_router(br, p);
+		break;
+	default:
+		goto unlock;
+	}
+	err = 0;
+unlock:
+	spin_unlock(&br->multicast_lock);
+
+	return err;
+}
+
+static void br_multicast_start_querier(struct net_bridge *br,
+				       struct bridge_mcast_own_query *query)
+{
+	struct net_bridge_port *port;
+
+	__br_multicast_open(br, query);
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(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
+	}
+	rcu_read_unlock();
+}
+
+int br_multicast_toggle(struct net_bridge *br, unsigned long val)
+{
+	struct net_bridge_mdb_htable *mdb;
+	struct net_bridge_port *port;
+	int err = 0;
+
+	spin_lock_bh(&br->multicast_lock);
+	if (br->multicast_disabled == !val)
+		goto unlock;
+
+	br_mc_disabled_update(br->dev, !val);
+	br->multicast_disabled = !val;
+	if (br->multicast_disabled)
+		goto unlock;
+
+	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, mdb->max,
+				    br->hash_elasticity);
+		if (err)
+			goto rollback;
+	}
+
+	br_multicast_open(br);
+	list_for_each_entry(port, &br->port_list, list)
+		__br_multicast_enable_port(port);
+
+unlock:
+	spin_unlock_bh(&br->multicast_lock);
+
+	return err;
+}
+
+bool br_multicast_enabled(const struct net_device *dev)
+{
+	struct net_bridge *br = netdev_priv(dev);
+
+	return !br->multicast_disabled;
+}
+EXPORT_SYMBOL_GPL(br_multicast_enabled);
+
+bool br_multicast_router(const struct net_device *dev)
+{
+	struct net_bridge *br = netdev_priv(dev);
+	bool is_router;
+
+	spin_lock_bh(&br->multicast_lock);
+	is_router = br_multicast_is_router(br);
+	spin_unlock_bh(&br->multicast_lock);
+	return is_router;
+}
+EXPORT_SYMBOL_GPL(br_multicast_router);
+
+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 = -EINVAL;
+	u32 old;
+	struct net_bridge_mdb_htable *mdb;
+
+	spin_lock_bh(&br->multicast_lock);
+	if (!is_power_of_2(val))
+		goto unlock;
+
+	mdb = mlock_dereference(br->mdb, br);
+	if (mdb && val < mdb->size)
+		goto unlock;
+
+	err = 0;
+
+	old = br->hash_max;
+	br->hash_max = val;
+
+	if (mdb) {
+		if (mdb->old) {
+			err = -EEXIST;
+rollback:
+			br->hash_max = old;
+			goto unlock;
+		}
+
+		err = br_mdb_rehash(&br->mdb, br->hash_max,
+				    br->hash_elasticity);
+		if (err)
+			goto rollback;
+	}
+
+unlock:
+	spin_unlock_bh(&br->multicast_lock);
+
+	return err;
+}
+
+int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
+{
+	/* Currently we support only version 2 and 3 */
+	switch (val) {
+	case 2:
+	case 3:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	spin_lock_bh(&br->multicast_lock);
+	br->multicast_igmp_version = val;
+	spin_unlock_bh(&br->multicast_lock);
+
+	return 0;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
+{
+	/* Currently we support version 1 and 2 */
+	switch (val) {
+	case 1:
+	case 2:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	spin_lock_bh(&br->multicast_lock);
+	br->multicast_mld_version = val;
+	spin_unlock_bh(&br->multicast_lock);
+
+	return 0;
+}
+#endif
+
+/**
+ * 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_anywhere - Checks for a querier on a bridge
+ * @dev: The bridge port providing the bridge on 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 valid querier exists anywhere on the bridged link layer.
+ * Otherwise returns false.
+ */
+bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
+{
+	struct net_bridge *br;
+	struct net_bridge_port *port;
+	struct ethhdr eth;
+	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;
+
+	memset(&eth, 0, sizeof(eth));
+	eth.h_proto = htons(proto);
+
+	ret = br_multicast_querier_exists(br, &eth);
+
+unlock:
+	rcu_read_unlock();
+	return ret;
+}
+EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
+
+/**
+ * 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);
+
+static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
+			       const struct sk_buff *skb, u8 type, u8 dir)
+{
+	struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
+	__be16 proto = skb->protocol;
+	unsigned int t_len;
+
+	u64_stats_update_begin(&pstats->syncp);
+	switch (proto) {
+	case htons(ETH_P_IP):
+		t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
+		switch (type) {
+		case IGMP_HOST_MEMBERSHIP_REPORT:
+			pstats->mstats.igmp_v1reports[dir]++;
+			break;
+		case IGMPV2_HOST_MEMBERSHIP_REPORT:
+			pstats->mstats.igmp_v2reports[dir]++;
+			break;
+		case IGMPV3_HOST_MEMBERSHIP_REPORT:
+			pstats->mstats.igmp_v3reports[dir]++;
+			break;
+		case IGMP_HOST_MEMBERSHIP_QUERY:
+			if (t_len != sizeof(struct igmphdr)) {
+				pstats->mstats.igmp_v3queries[dir]++;
+			} else {
+				unsigned int offset = skb_transport_offset(skb);
+				struct igmphdr *ih, _ihdr;
+
+				ih = skb_header_pointer(skb, offset,
+							sizeof(_ihdr), &_ihdr);
+				if (!ih)
+					break;
+				if (!ih->code)
+					pstats->mstats.igmp_v1queries[dir]++;
+				else
+					pstats->mstats.igmp_v2queries[dir]++;
+			}
+			break;
+		case IGMP_HOST_LEAVE_MESSAGE:
+			pstats->mstats.igmp_leaves[dir]++;
+			break;
+		}
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case htons(ETH_P_IPV6):
+		t_len = ntohs(ipv6_hdr(skb)->payload_len) +
+			sizeof(struct ipv6hdr);
+		t_len -= skb_network_header_len(skb);
+		switch (type) {
+		case ICMPV6_MGM_REPORT:
+			pstats->mstats.mld_v1reports[dir]++;
+			break;
+		case ICMPV6_MLD2_REPORT:
+			pstats->mstats.mld_v2reports[dir]++;
+			break;
+		case ICMPV6_MGM_QUERY:
+			if (t_len != sizeof(struct mld_msg))
+				pstats->mstats.mld_v2queries[dir]++;
+			else
+				pstats->mstats.mld_v1queries[dir]++;
+			break;
+		case ICMPV6_MGM_REDUCTION:
+			pstats->mstats.mld_leaves[dir]++;
+			break;
+		}
+		break;
+#endif /* CONFIG_IPV6 */
+	}
+	u64_stats_update_end(&pstats->syncp);
+}
+
+void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
+			const struct sk_buff *skb, u8 type, u8 dir)
+{
+	struct bridge_mcast_stats __percpu *stats;
+
+	/* if multicast_disabled is true then igmp type can't be set */
+	if (!type || !br->multicast_stats_enabled)
+		return;
+
+	if (p)
+		stats = p->mcast_stats;
+	else
+		stats = br->mcast_stats;
+	if (WARN_ON(!stats))
+		return;
+
+	br_mcast_stats_add(stats, skb, type, dir);
+}
+
+int br_multicast_init_stats(struct net_bridge *br)
+{
+	br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
+	if (!br->mcast_stats)
+		return -ENOMEM;
+
+	return 0;
+}
+
+void br_multicast_uninit_stats(struct net_bridge *br)
+{
+	free_percpu(br->mcast_stats);
+}
+
+static void mcast_stats_add_dir(u64 *dst, u64 *src)
+{
+	dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
+	dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
+}
+
+void br_multicast_get_stats(const struct net_bridge *br,
+			    const struct net_bridge_port *p,
+			    struct br_mcast_stats *dest)
+{
+	struct bridge_mcast_stats __percpu *stats;
+	struct br_mcast_stats tdst;
+	int i;
+
+	memset(dest, 0, sizeof(*dest));
+	if (p)
+		stats = p->mcast_stats;
+	else
+		stats = br->mcast_stats;
+	if (WARN_ON(!stats))
+		return;
+
+	memset(&tdst, 0, sizeof(tdst));
+	for_each_possible_cpu(i) {
+		struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
+		struct br_mcast_stats temp;
+		unsigned int start;
+
+		do {
+			start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
+			memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
+		} while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
+
+		mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
+		mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
+		mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
+		mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
+		mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
+		mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
+		mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
+		tdst.igmp_parse_errors += temp.igmp_parse_errors;
+
+		mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
+		mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
+		mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
+		mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
+		mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
+		tdst.mld_parse_errors += temp.mld_parse_errors;
+	}
+	memcpy(dest, &tdst, sizeof(*dest));
+}