net: bridge: vlan: add mcast snooping control

[thirdparty/linux.git] / net / bridge / br_multicast.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Bridge multicast support.
 *
 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
 */

#include <linux/err.h>
#include <linux/export.h>
#include <linux/if_ether.h>
#include <linux/igmp.h>
#include <linux/in.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 <linux/icmpv6.h>
#include <net/ipv6.h>
#include <net/mld.h>
#include <net/ip6_checksum.h>
#include <net/addrconf.h>
#endif

#include "br_private.h"
#include "br_private_mcast_eht.h"

static const struct rhashtable_params br_mdb_rht_params = {
        .head_offset = offsetof(struct net_bridge_mdb_entry, rhnode),
        .key_offset = offsetof(struct net_bridge_mdb_entry, addr),
        .key_len = sizeof(struct br_ip),
        .automatic_shrinking = true,
};

static const struct rhashtable_params br_sg_port_rht_params = {
        .head_offset = offsetof(struct net_bridge_port_group, rhnode),
        .key_offset = offsetof(struct net_bridge_port_group, key),
        .key_len = sizeof(struct net_bridge_port_group_sg_key),
        .automatic_shrinking = true,
};

static void br_multicast_start_querier(struct net_bridge_mcast *brmctx,
                                       struct bridge_mcast_own_query *query);
static void br_ip4_multicast_add_router(struct net_bridge_mcast *brmctx,
                                        struct net_bridge_mcast_port *pmctx);
static void br_ip4_multicast_leave_group(struct net_bridge_mcast *brmctx,
                                         struct net_bridge_mcast_port *pmctx,
                                         __be32 group,
                                         __u16 vid,
                                         const unsigned char *src);
static void br_multicast_port_group_rexmit(struct timer_list *t);

static void
br_multicast_rport_del_notify(struct net_bridge_mcast_port *pmctx, bool deleted);
static void br_ip6_multicast_add_router(struct net_bridge_mcast *brmctx,
                                        struct net_bridge_mcast_port *pmctx);
#if IS_ENABLED(CONFIG_IPV6)
static void br_ip6_multicast_leave_group(struct net_bridge_mcast *brmctx,
                                         struct net_bridge_mcast_port *pmctx,
                                         const struct in6_addr *group,
                                         __u16 vid, const unsigned char *src);
#endif
static struct net_bridge_port_group *
__br_multicast_add_group(struct net_bridge_mcast *brmctx,
                         struct net_bridge_mcast_port *pmctx,
                         struct br_ip *group,
                         const unsigned char *src,
                         u8 filter_mode,
                         bool igmpv2_mldv1,
                         bool blocked);
static void br_multicast_find_del_pg(struct net_bridge *br,
                                     struct net_bridge_port_group *pg);
static void __br_multicast_stop(struct net_bridge_mcast *brmctx);

static struct net_bridge_port_group *
br_sg_port_find(struct net_bridge *br,
                struct net_bridge_port_group_sg_key *sg_p)
{
        lockdep_assert_held_once(&br->multicast_lock);

        return rhashtable_lookup_fast(&br->sg_port_tbl, sg_p,
                                      br_sg_port_rht_params);
}

static struct net_bridge_mdb_entry *br_mdb_ip_get_rcu(struct net_bridge *br,
                                                      struct br_ip *dst)
{
        return rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
}

struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge *br,
                                           struct br_ip *dst)
{
        struct net_bridge_mdb_entry *ent;

        lockdep_assert_held_once(&br->multicast_lock);

        rcu_read_lock();
        ent = rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
        rcu_read_unlock();

        return ent;
}

static struct net_bridge_mdb_entry *br_mdb_ip4_get(struct net_bridge *br,
                                                   __be32 dst, __u16 vid)
{
        struct br_ip br_dst;

        memset(&br_dst, 0, sizeof(br_dst));
        br_dst.dst.ip4 = dst;
        br_dst.proto = htons(ETH_P_IP);
        br_dst.vid = vid;

        return br_mdb_ip_get(br, &br_dst);
}

#if IS_ENABLED(CONFIG_IPV6)
static struct net_bridge_mdb_entry *br_mdb_ip6_get(struct net_bridge *br,
                                                   const struct in6_addr *dst,
                                                   __u16 vid)
{
        struct br_ip br_dst;

        memset(&br_dst, 0, sizeof(br_dst));
        br_dst.dst.ip6 = *dst;
        br_dst.proto = htons(ETH_P_IPV6);
        br_dst.vid = vid;

        return br_mdb_ip_get(br, &br_dst);
}
#endif

struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge_mcast *brmctx,
                                        struct sk_buff *skb, u16 vid)
{
        struct net_bridge *br = brmctx->br;
        struct br_ip ip;

        if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
            br_multicast_ctx_vlan_global_disabled(brmctx))
                return NULL;

        if (BR_INPUT_SKB_CB(skb)->igmp)
                return NULL;

        memset(&ip, 0, sizeof(ip));
        ip.proto = skb->protocol;
        ip.vid = vid;

        switch (skb->protocol) {
        case htons(ETH_P_IP):
                ip.dst.ip4 = ip_hdr(skb)->daddr;
                if (brmctx->multicast_igmp_version == 3) {
                        struct net_bridge_mdb_entry *mdb;

                        ip.src.ip4 = ip_hdr(skb)->saddr;
                        mdb = br_mdb_ip_get_rcu(br, &ip);
                        if (mdb)
                                return mdb;
                        ip.src.ip4 = 0;
                }
                break;
#if IS_ENABLED(CONFIG_IPV6)
        case htons(ETH_P_IPV6):
                ip.dst.ip6 = ipv6_hdr(skb)->daddr;
                if (brmctx->multicast_mld_version == 2) {
                        struct net_bridge_mdb_entry *mdb;

                        ip.src.ip6 = ipv6_hdr(skb)->saddr;
                        mdb = br_mdb_ip_get_rcu(br, &ip);
                        if (mdb)
                                return mdb;
                        memset(&ip.src.ip6, 0, sizeof(ip.src.ip6));
                }
                break;
#endif
        default:
                ip.proto = 0;
                ether_addr_copy(ip.dst.mac_addr, eth_hdr(skb)->h_dest);
        }

        return br_mdb_ip_get_rcu(br, &ip);
}

/* IMPORTANT: this function must be used only when the contexts cannot be
 * passed down (e.g. timer) and must be used for read-only purposes because
 * the vlan snooping option can change, so it can return any context
 * (non-vlan or vlan). Its initial intended purpose is to read timer values
 * from the *current* context based on the option. At worst that could lead
 * to inconsistent timers when the contexts are changed, i.e. src timer
 * which needs to re-arm with a specific delay taken from the old context
 */
static struct net_bridge_mcast_port *
br_multicast_pg_to_port_ctx(const struct net_bridge_port_group *pg)
{
        struct net_bridge_mcast_port *pmctx = &pg->key.port->multicast_ctx;
        struct net_bridge_vlan *vlan;

        lockdep_assert_held_once(&pg->key.port->br->multicast_lock);

        /* if vlan snooping is disabled use the port's multicast context */
        if (!pg->key.addr.vid ||
            !br_opt_get(pg->key.port->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED))
                goto out;

        /* locking is tricky here, due to different rules for multicast and
         * vlans we need to take rcu to find the vlan and make sure it has
         * the BR_VLFLAG_MCAST_ENABLED flag set, it can only change under
         * multicast_lock which must be already held here, so the vlan's pmctx
         * can safely be used on return
         */
        rcu_read_lock();
        vlan = br_vlan_find(nbp_vlan_group(pg->key.port), pg->key.addr.vid);
        if (vlan && !br_multicast_port_ctx_vlan_disabled(&vlan->port_mcast_ctx))
                pmctx = &vlan->port_mcast_ctx;
        else
                pmctx = NULL;
        rcu_read_unlock();
out:
        return pmctx;
}

/* when snooping we need to check if the contexts should be used
 * in the following order:
 * - if pmctx is non-NULL (port), check if it should be used
 * - if pmctx is NULL (bridge), check if brmctx should be used
 */
static bool
br_multicast_ctx_should_use(const struct net_bridge_mcast *brmctx,
                            const struct net_bridge_mcast_port *pmctx)
{
        if (!netif_running(brmctx->br->dev))
                return false;

        if (pmctx)
                return !br_multicast_port_ctx_state_disabled(pmctx);
        else
                return !br_multicast_ctx_vlan_disabled(brmctx);
}

static bool br_port_group_equal(struct net_bridge_port_group *p,
                                struct net_bridge_port *port,
                                const unsigned char *src)
{
        if (p->key.port != port)
                return false;

        if (!(port->flags & BR_MULTICAST_TO_UNICAST))
                return true;

        return ether_addr_equal(src, p->eth_addr);
}

static void __fwd_add_star_excl(struct net_bridge_mcast_port *pmctx,
                                struct net_bridge_port_group *pg,
                                struct br_ip *sg_ip)
{
        struct net_bridge_port_group_sg_key sg_key;
        struct net_bridge_port_group *src_pg;
        struct net_bridge_mcast *brmctx;

        memset(&sg_key, 0, sizeof(sg_key));
        brmctx = br_multicast_port_ctx_get_global(pmctx);
        sg_key.port = pg->key.port;
        sg_key.addr = *sg_ip;
        if (br_sg_port_find(brmctx->br, &sg_key))
                return;

        src_pg = __br_multicast_add_group(brmctx, pmctx,
                                          sg_ip, pg->eth_addr,
                                          MCAST_INCLUDE, false, false);
        if (IS_ERR_OR_NULL(src_pg) ||
            src_pg->rt_protocol != RTPROT_KERNEL)
                return;

        src_pg->flags |= MDB_PG_FLAGS_STAR_EXCL;
}

static void __fwd_del_star_excl(struct net_bridge_port_group *pg,
                                struct br_ip *sg_ip)
{
        struct net_bridge_port_group_sg_key sg_key;
        struct net_bridge *br = pg->key.port->br;
        struct net_bridge_port_group *src_pg;

        memset(&sg_key, 0, sizeof(sg_key));
        sg_key.port = pg->key.port;
        sg_key.addr = *sg_ip;
        src_pg = br_sg_port_find(br, &sg_key);
        if (!src_pg || !(src_pg->flags & MDB_PG_FLAGS_STAR_EXCL) ||
            src_pg->rt_protocol != RTPROT_KERNEL)
                return;

        br_multicast_find_del_pg(br, src_pg);
}

/* When a port group transitions to (or is added as) EXCLUDE we need to add it
 * to all other ports' S,G entries which are not blocked by the current group
 * for proper replication, the assumption is that any S,G blocked entries
 * are already added so the S,G,port lookup should skip them.
 * When a port group transitions from EXCLUDE -> INCLUDE mode or is being
 * deleted we need to remove it from all ports' S,G entries where it was
 * automatically installed before (i.e. where it's MDB_PG_FLAGS_STAR_EXCL).
 */
void br_multicast_star_g_handle_mode(struct net_bridge_port_group *pg,
                                     u8 filter_mode)
{
        struct net_bridge *br = pg->key.port->br;
        struct net_bridge_port_group *pg_lst;
        struct net_bridge_mcast_port *pmctx;
        struct net_bridge_mdb_entry *mp;
        struct br_ip sg_ip;

        if (WARN_ON(!br_multicast_is_star_g(&pg->key.addr)))
                return;

        mp = br_mdb_ip_get(br, &pg->key.addr);
        if (!mp)
                return;
        pmctx = br_multicast_pg_to_port_ctx(pg);
        if (!pmctx)
                return;

        memset(&sg_ip, 0, sizeof(sg_ip));
        sg_ip = pg->key.addr;

        for (pg_lst = mlock_dereference(mp->ports, br);
             pg_lst;
             pg_lst = mlock_dereference(pg_lst->next, br)) {
                struct net_bridge_group_src *src_ent;

                if (pg_lst == pg)
                        continue;
                hlist_for_each_entry(src_ent, &pg_lst->src_list, node) {
                        if (!(src_ent->flags & BR_SGRP_F_INSTALLED))
                                continue;
                        sg_ip.src = src_ent->addr.src;
                        switch (filter_mode) {
                        case MCAST_INCLUDE:
                                __fwd_del_star_excl(pg, &sg_ip);
                                break;
                        case MCAST_EXCLUDE:
                                __fwd_add_star_excl(pmctx, pg, &sg_ip);
                                break;
                        }
                }
        }
}

/* called when adding a new S,G with host_joined == false by default */
static void br_multicast_sg_host_state(struct net_bridge_mdb_entry *star_mp,
                                       struct net_bridge_port_group *sg)
{
        struct net_bridge_mdb_entry *sg_mp;

        if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr)))
                return;
        if (!star_mp->host_joined)
                return;

        sg_mp = br_mdb_ip_get(star_mp->br, &sg->key.addr);
        if (!sg_mp)
                return;
        sg_mp->host_joined = true;
}

/* set the host_joined state of all of *,G's S,G entries */
static void br_multicast_star_g_host_state(struct net_bridge_mdb_entry *star_mp)
{
        struct net_bridge *br = star_mp->br;
        struct net_bridge_mdb_entry *sg_mp;
        struct net_bridge_port_group *pg;
        struct br_ip sg_ip;

        if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr)))
                return;

        memset(&sg_ip, 0, sizeof(sg_ip));
        sg_ip = star_mp->addr;
        for (pg = mlock_dereference(star_mp->ports, br);
             pg;
             pg = mlock_dereference(pg->next, br)) {
                struct net_bridge_group_src *src_ent;

                hlist_for_each_entry(src_ent, &pg->src_list, node) {
                        if (!(src_ent->flags & BR_SGRP_F_INSTALLED))
                                continue;
                        sg_ip.src = src_ent->addr.src;
                        sg_mp = br_mdb_ip_get(br, &sg_ip);
                        if (!sg_mp)
                                continue;
                        sg_mp->host_joined = star_mp->host_joined;
                }
        }
}

static void br_multicast_sg_del_exclude_ports(struct net_bridge_mdb_entry *sgmp)
{
        struct net_bridge_port_group __rcu **pp;
        struct net_bridge_port_group *p;

        /* *,G exclude ports are only added to S,G entries */
        if (WARN_ON(br_multicast_is_star_g(&sgmp->addr)))
                return;

        /* we need the STAR_EXCLUDE ports if there are non-STAR_EXCLUDE ports
         * we should ignore perm entries since they're managed by user-space
         */
        for (pp = &sgmp->ports;
             (p = mlock_dereference(*pp, sgmp->br)) != NULL;
             pp = &p->next)
                if (!(p->flags & (MDB_PG_FLAGS_STAR_EXCL |
                                  MDB_PG_FLAGS_PERMANENT)))
                        return;

        /* currently the host can only have joined the *,G which means
         * we treat it as EXCLUDE {}, so for an S,G it's considered a
         * STAR_EXCLUDE entry and we can safely leave it
         */
        sgmp->host_joined = false;

        for (pp = &sgmp->ports;
             (p = mlock_dereference(*pp, sgmp->br)) != NULL;) {
                if (!(p->flags & MDB_PG_FLAGS_PERMANENT))
                        br_multicast_del_pg(sgmp, p, pp);
                else
                        pp = &p->next;
        }
}

void br_multicast_sg_add_exclude_ports(struct net_bridge_mdb_entry *star_mp,
                                       struct net_bridge_port_group *sg)
{
        struct net_bridge_port_group_sg_key sg_key;
        struct net_bridge *br = star_mp->br;
        struct net_bridge_mcast_port *pmctx;
        struct net_bridge_port_group *pg;
        struct net_bridge_mcast *brmctx;

        if (WARN_ON(br_multicast_is_star_g(&sg->key.addr)))
                return;
        if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr)))
                return;

        br_multicast_sg_host_state(star_mp, sg);
        memset(&sg_key, 0, sizeof(sg_key));
        sg_key.addr = sg->key.addr;
        /* we need to add all exclude ports to the S,G */
        for (pg = mlock_dereference(star_mp->ports, br);
             pg;
             pg = mlock_dereference(pg->next, br)) {
                struct net_bridge_port_group *src_pg;

                if (pg == sg || pg->filter_mode == MCAST_INCLUDE)
                        continue;

                sg_key.port = pg->key.port;
                if (br_sg_port_find(br, &sg_key))
                        continue;

                pmctx = br_multicast_pg_to_port_ctx(pg);
                if (!pmctx)
                        continue;
                brmctx = br_multicast_port_ctx_get_global(pmctx);

                src_pg = __br_multicast_add_group(brmctx, pmctx,
                                                  &sg->key.addr,
                                                  sg->eth_addr,
                                                  MCAST_INCLUDE, false, false);
                if (IS_ERR_OR_NULL(src_pg) ||
                    src_pg->rt_protocol != RTPROT_KERNEL)
                        continue;
                src_pg->flags |= MDB_PG_FLAGS_STAR_EXCL;
        }
}

static void br_multicast_fwd_src_add(struct net_bridge_group_src *src)
{
        struct net_bridge_mdb_entry *star_mp;
        struct net_bridge_mcast_port *pmctx;
        struct net_bridge_port_group *sg;
        struct net_bridge_mcast *brmctx;
        struct br_ip sg_ip;

        if (src->flags & BR_SGRP_F_INSTALLED)
                return;

        memset(&sg_ip, 0, sizeof(sg_ip));
        pmctx = br_multicast_pg_to_port_ctx(src->pg);
        if (!pmctx)
                return;
        brmctx = br_multicast_port_ctx_get_global(pmctx);
        sg_ip = src->pg->key.addr;
        sg_ip.src = src->addr.src;

        sg = __br_multicast_add_group(brmctx, pmctx, &sg_ip,
                                      src->pg->eth_addr, MCAST_INCLUDE, false,
                                      !timer_pending(&src->timer));
        if (IS_ERR_OR_NULL(sg))
                return;
        src->flags |= BR_SGRP_F_INSTALLED;
        sg->flags &= ~MDB_PG_FLAGS_STAR_EXCL;

        /* if it was added by user-space as perm we can skip next steps */
        if (sg->rt_protocol != RTPROT_KERNEL &&
            (sg->flags & MDB_PG_FLAGS_PERMANENT))
                return;

        /* the kernel is now responsible for removing this S,G */
        del_timer(&sg->timer);
        star_mp = br_mdb_ip_get(src->br, &src->pg->key.addr);
        if (!star_mp)
                return;

        br_multicast_sg_add_exclude_ports(star_mp, sg);
}

static void br_multicast_fwd_src_remove(struct net_bridge_group_src *src,
                                        bool fastleave)
{
        struct net_bridge_port_group *p, *pg = src->pg;
        struct net_bridge_port_group __rcu **pp;
        struct net_bridge_mdb_entry *mp;
        struct br_ip sg_ip;

        memset(&sg_ip, 0, sizeof(sg_ip));
        sg_ip = pg->key.addr;
        sg_ip.src = src->addr.src;

        mp = br_mdb_ip_get(src->br, &sg_ip);
        if (!mp)
                return;

        for (pp = &mp->ports;
             (p = mlock_dereference(*pp, src->br)) != NULL;
             pp = &p->next) {
                if (!br_port_group_equal(p, pg->key.port, pg->eth_addr))
                        continue;

                if (p->rt_protocol != RTPROT_KERNEL &&
                    (p->flags & MDB_PG_FLAGS_PERMANENT))
                        break;

                if (fastleave)
                        p->flags |= MDB_PG_FLAGS_FAST_LEAVE;
                br_multicast_del_pg(mp, p, pp);
                break;
        }
        src->flags &= ~BR_SGRP_F_INSTALLED;
}

/* install S,G and based on src's timer enable or disable forwarding */
static void br_multicast_fwd_src_handle(struct net_bridge_group_src *src)
{
        struct net_bridge_port_group_sg_key sg_key;
        struct net_bridge_port_group *sg;
        u8 old_flags;

        br_multicast_fwd_src_add(src);

        memset(&sg_key, 0, sizeof(sg_key));
        sg_key.addr = src->pg->key.addr;
        sg_key.addr.src = src->addr.src;
        sg_key.port = src->pg->key.port;

        sg = br_sg_port_find(src->br, &sg_key);
        if (!sg || (sg->flags & MDB_PG_FLAGS_PERMANENT))
                return;

        old_flags = sg->flags;
        if (timer_pending(&src->timer))
                sg->flags &= ~MDB_PG_FLAGS_BLOCKED;
        else
                sg->flags |= MDB_PG_FLAGS_BLOCKED;

        if (old_flags != sg->flags) {
                struct net_bridge_mdb_entry *sg_mp;

                sg_mp = br_mdb_ip_get(src->br, &sg_key.addr);
                if (!sg_mp)
                        return;
                br_mdb_notify(src->br->dev, sg_mp, sg, RTM_NEWMDB);
        }
}

static void br_multicast_destroy_mdb_entry(struct net_bridge_mcast_gc *gc)
{
        struct net_bridge_mdb_entry *mp;

        mp = container_of(gc, struct net_bridge_mdb_entry, mcast_gc);
        WARN_ON(!hlist_unhashed(&mp->mdb_node));
        WARN_ON(mp->ports);

        del_timer_sync(&mp->timer);
        kfree_rcu(mp, rcu);
}

static void br_multicast_del_mdb_entry(struct net_bridge_mdb_entry *mp)
{
        struct net_bridge *br = mp->br;

        rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
                               br_mdb_rht_params);
        hlist_del_init_rcu(&mp->mdb_node);
        hlist_add_head(&mp->mcast_gc.gc_node, &br->mcast_gc_list);
        queue_work(system_long_wq, &br->mcast_gc_work);
}

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;

        spin_lock(&br->multicast_lock);
        if (hlist_unhashed(&mp->mdb_node) || !netif_running(br->dev) ||
            timer_pending(&mp->timer))
                goto out;

        br_multicast_host_leave(mp, true);

        if (mp->ports)
                goto out;
        br_multicast_del_mdb_entry(mp);
out:
        spin_unlock(&br->multicast_lock);
}

static void br_multicast_destroy_group_src(struct net_bridge_mcast_gc *gc)
{
        struct net_bridge_group_src *src;

        src = container_of(gc, struct net_bridge_group_src, mcast_gc);
        WARN_ON(!hlist_unhashed(&src->node));

        del_timer_sync(&src->timer);
        kfree_rcu(src, rcu);
}

void br_multicast_del_group_src(struct net_bridge_group_src *src,
                                bool fastleave)
{
        struct net_bridge *br = src->pg->key.port->br;

        br_multicast_fwd_src_remove(src, fastleave);
        hlist_del_init_rcu(&src->node);
        src->pg->src_ents--;
        hlist_add_head(&src->mcast_gc.gc_node, &br->mcast_gc_list);
        queue_work(system_long_wq, &br->mcast_gc_work);
}

static void br_multicast_destroy_port_group(struct net_bridge_mcast_gc *gc)
{
        struct net_bridge_port_group *pg;

        pg = container_of(gc, struct net_bridge_port_group, mcast_gc);
        WARN_ON(!hlist_unhashed(&pg->mglist));
        WARN_ON(!hlist_empty(&pg->src_list));

        del_timer_sync(&pg->rexmit_timer);
        del_timer_sync(&pg->timer);
        kfree_rcu(pg, rcu);
}

void br_multicast_del_pg(struct net_bridge_mdb_entry *mp,
                         struct net_bridge_port_group *pg,
                         struct net_bridge_port_group __rcu **pp)
{
        struct net_bridge *br = pg->key.port->br;
        struct net_bridge_group_src *ent;
        struct hlist_node *tmp;

        rcu_assign_pointer(*pp, pg->next);
        hlist_del_init(&pg->mglist);
        br_multicast_eht_clean_sets(pg);
        hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node)
                br_multicast_del_group_src(ent, false);
        br_mdb_notify(br->dev, mp, pg, RTM_DELMDB);
        if (!br_multicast_is_star_g(&mp->addr)) {
                rhashtable_remove_fast(&br->sg_port_tbl, &pg->rhnode,
                                       br_sg_port_rht_params);
                br_multicast_sg_del_exclude_ports(mp);
        } else {
                br_multicast_star_g_handle_mode(pg, MCAST_INCLUDE);
        }
        hlist_add_head(&pg->mcast_gc.gc_node, &br->mcast_gc_list);
        queue_work(system_long_wq, &br->mcast_gc_work);

        if (!mp->ports && !mp->host_joined && netif_running(br->dev))
                mod_timer(&mp->timer, jiffies);
}

static void br_multicast_find_del_pg(struct net_bridge *br,
                                     struct net_bridge_port_group *pg)
{
        struct net_bridge_port_group __rcu **pp;
        struct net_bridge_mdb_entry *mp;
        struct net_bridge_port_group *p;

        mp = br_mdb_ip_get(br, &pg->key.addr);
        if (WARN_ON(!mp))
                return;

        for (pp = &mp->ports;
             (p = mlock_dereference(*pp, br)) != NULL;
             pp = &p->next) {
                if (p != pg)
                        continue;

                br_multicast_del_pg(mp, pg, pp);
                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_group_src *src_ent;
        struct net_bridge *br = pg->key.port->br;
        struct hlist_node *tmp;
        bool changed;

        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;

        changed = !!(pg->filter_mode == MCAST_EXCLUDE);
        pg->filter_mode = MCAST_INCLUDE;
        hlist_for_each_entry_safe(src_ent, tmp, &pg->src_list, node) {
                if (!timer_pending(&src_ent->timer)) {
                        br_multicast_del_group_src(src_ent, false);
                        changed = true;
                }
        }

        if (hlist_empty(&pg->src_list)) {
                br_multicast_find_del_pg(br, pg);
        } else if (changed) {
                struct net_bridge_mdb_entry *mp = br_mdb_ip_get(br, &pg->key.addr);

                if (changed && br_multicast_is_star_g(&pg->key.addr))
                        br_multicast_star_g_handle_mode(pg, MCAST_INCLUDE);

                if (WARN_ON(!mp))
                        goto out;
                br_mdb_notify(br->dev, mp, pg, RTM_NEWMDB);
        }
out:
        spin_unlock(&br->multicast_lock);
}

static void br_multicast_gc(struct hlist_head *head)
{
        struct net_bridge_mcast_gc *gcent;
        struct hlist_node *tmp;

        hlist_for_each_entry_safe(gcent, tmp, head, gc_node) {
                hlist_del_init(&gcent->gc_node);
                gcent->destroy(gcent);
        }
}

static void __br_multicast_query_handle_vlan(struct net_bridge_mcast *brmctx,
                                             struct net_bridge_mcast_port *pmctx,
                                             struct sk_buff *skb)
{
        struct net_bridge_vlan *vlan = NULL;

        if (pmctx && br_multicast_port_ctx_is_vlan(pmctx))
                vlan = pmctx->vlan;
        else if (br_multicast_ctx_is_vlan(brmctx))
                vlan = brmctx->vlan;

        if (vlan && !(vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED)) {
                u16 vlan_proto;

                if (br_vlan_get_proto(brmctx->br->dev, &vlan_proto) != 0)
                        return;
                __vlan_hwaccel_put_tag(skb, htons(vlan_proto), vlan->vid);
        }
}

static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge_mcast *brmctx,
                                                    struct net_bridge_mcast_port *pmctx,
                                                    struct net_bridge_port_group *pg,
                                                    __be32 ip_dst, __be32 group,
                                                    bool with_srcs, bool over_lmqt,
                                                    u8 sflag, u8 *igmp_type,
                                                    bool *need_rexmit)
{
        struct net_bridge_port *p = pg ? pg->key.port : NULL;
        struct net_bridge_group_src *ent;
        size_t pkt_size, igmp_hdr_size;
        unsigned long now = jiffies;
        struct igmpv3_query *ihv3;
        void *csum_start = NULL;
        __sum16 *csum = NULL;
        struct sk_buff *skb;
        struct igmphdr *ih;
        struct ethhdr *eth;
        unsigned long lmqt;
        struct iphdr *iph;
        u16 lmqt_srcs = 0;

        igmp_hdr_size = sizeof(*ih);
        if (brmctx->multicast_igmp_version == 3) {
                igmp_hdr_size = sizeof(*ihv3);
                if (pg && with_srcs) {
                        lmqt = now + (brmctx->multicast_last_member_interval *
                                      brmctx->multicast_last_member_count);
                        hlist_for_each_entry(ent, &pg->src_list, node) {
                                if (over_lmqt == time_after(ent->timer.expires,
                                                            lmqt) &&
                                    ent->src_query_rexmit_cnt > 0)
                                        lmqt_srcs++;
                        }

                        if (!lmqt_srcs)
                                return NULL;
                        igmp_hdr_size += lmqt_srcs * sizeof(__be32);
                }
        }

        pkt_size = sizeof(*eth) + sizeof(*iph) + 4 + igmp_hdr_size;
        if ((p && pkt_size > p->dev->mtu) ||
            pkt_size > brmctx->br->dev->mtu)
                return NULL;

        skb = netdev_alloc_skb_ip_align(brmctx->br->dev, pkt_size);
        if (!skb)
                goto out;

        __br_multicast_query_handle_vlan(brmctx, pmctx, skb);
        skb->protocol = htons(ETH_P_IP);

        skb_reset_mac_header(skb);
        eth = eth_hdr(skb);

        ether_addr_copy(eth->h_source, brmctx->br->dev->dev_addr);
        ip_eth_mc_map(ip_dst, eth->h_dest);
        eth->h_proto = htons(ETH_P_IP);
        skb_put(skb, sizeof(*eth));

        skb_set_network_header(skb, skb->len);
        iph = ip_hdr(skb);
        iph->tot_len = htons(pkt_size - sizeof(*eth));

        iph->version = 4;
        iph->ihl = 6;
        iph->tos = 0xc0;
        iph->id = 0;
        iph->frag_off = htons(IP_DF);
        iph->ttl = 1;
        iph->protocol = IPPROTO_IGMP;
        iph->saddr = br_opt_get(brmctx->br, BROPT_MULTICAST_QUERY_USE_IFADDR) ?
                     inet_select_addr(brmctx->br->dev, 0, RT_SCOPE_LINK) : 0;
        iph->daddr = ip_dst;
        ((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 (brmctx->multicast_igmp_version) {
        case 2:
                ih = igmp_hdr(skb);
                ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
                ih->code = (group ? brmctx->multicast_last_member_interval :
                                    brmctx->multicast_query_response_interval) /
                           (HZ / IGMP_TIMER_SCALE);
                ih->group = group;
                ih->csum = 0;
                csum = &ih->csum;
                csum_start = (void *)ih;
                break;
        case 3:
                ihv3 = igmpv3_query_hdr(skb);
                ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
                ihv3->code = (group ? brmctx->multicast_last_member_interval :
                                      brmctx->multicast_query_response_interval) /
                             (HZ / IGMP_TIMER_SCALE);
                ihv3->group = group;
                ihv3->qqic = brmctx->multicast_query_interval / HZ;
                ihv3->nsrcs = htons(lmqt_srcs);
                ihv3->resv = 0;
                ihv3->suppress = sflag;
                ihv3->qrv = 2;
                ihv3->csum = 0;
                csum = &ihv3->csum;
                csum_start = (void *)ihv3;
                if (!pg || !with_srcs)
                        break;

                lmqt_srcs = 0;
                hlist_for_each_entry(ent, &pg->src_list, node) {
                        if (over_lmqt == time_after(ent->timer.expires,
                                                    lmqt) &&
                            ent->src_query_rexmit_cnt > 0) {
                                ihv3->srcs[lmqt_srcs++] = ent->addr.src.ip4;
                                ent->src_query_rexmit_cnt--;
                                if (need_rexmit && ent->src_query_rexmit_cnt)
                                        *need_rexmit = true;
                        }
                }
                if (WARN_ON(lmqt_srcs != ntohs(ihv3->nsrcs))) {
                        kfree_skb(skb);
                        return NULL;
                }
                break;
        }

        if (WARN_ON(!csum || !csum_start)) {
                kfree_skb(skb);
                return NULL;
        }

        *csum = ip_compute_csum(csum_start, igmp_hdr_size);
        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_mcast *brmctx,
                                                    struct net_bridge_mcast_port *pmctx,
                                                    struct net_bridge_port_group *pg,
                                                    const struct in6_addr *ip6_dst,
                                                    const struct in6_addr *group,
                                                    bool with_srcs, bool over_llqt,
                                                    u8 sflag, u8 *igmp_type,
                                                    bool *need_rexmit)
{
        struct net_bridge_port *p = pg ? pg->key.port : NULL;
        struct net_bridge_group_src *ent;
        size_t pkt_size, mld_hdr_size;
        unsigned long now = jiffies;
        struct mld2_query *mld2q;
        void *csum_start = NULL;
        unsigned long interval;
        __sum16 *csum = NULL;
        struct ipv6hdr *ip6h;
        struct mld_msg *mldq;
        struct sk_buff *skb;
        unsigned long llqt;
        struct ethhdr *eth;
        u16 llqt_srcs = 0;
        u8 *hopopt;

        mld_hdr_size = sizeof(*mldq);
        if (brmctx->multicast_mld_version == 2) {
                mld_hdr_size = sizeof(*mld2q);
                if (pg && with_srcs) {
                        llqt = now + (brmctx->multicast_last_member_interval *
                                      brmctx->multicast_last_member_count);
                        hlist_for_each_entry(ent, &pg->src_list, node) {
                                if (over_llqt == time_after(ent->timer.expires,
                                                            llqt) &&
                                    ent->src_query_rexmit_cnt > 0)
                                        llqt_srcs++;
                        }

                        if (!llqt_srcs)
                                return NULL;
                        mld_hdr_size += llqt_srcs * sizeof(struct in6_addr);
                }
        }

        pkt_size = sizeof(*eth) + sizeof(*ip6h) + 8 + mld_hdr_size;
        if ((p && pkt_size > p->dev->mtu) ||
            pkt_size > brmctx->br->dev->mtu)
                return NULL;

        skb = netdev_alloc_skb_ip_align(brmctx->br->dev, pkt_size);
        if (!skb)
                goto out;

        __br_multicast_query_handle_vlan(brmctx, pmctx, skb);
        skb->protocol = htons(ETH_P_IPV6);

        /* Ethernet header */
        skb_reset_mac_header(skb);
        eth = eth_hdr(skb);

        ether_addr_copy(eth->h_source, brmctx->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;
        ip6h->daddr = *ip6_dst;
        if (ipv6_dev_get_saddr(dev_net(brmctx->br->dev), brmctx->br->dev,
                               &ip6h->daddr, 0, &ip6h->saddr)) {
                kfree_skb(skb);
                br_opt_toggle(brmctx->br, BROPT_HAS_IPV6_ADDR, false);
                return NULL;
        }

        br_opt_toggle(brmctx->br, BROPT_HAS_IPV6_ADDR, true);
        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(group) ?
                        brmctx->multicast_query_response_interval :
                        brmctx->multicast_last_member_interval;
        *igmp_type = ICMPV6_MGM_QUERY;
        switch (brmctx->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 = *group;
                csum = &mldq->mld_cksum;
                csum_start = (void *)mldq;
                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 = sflag;
                mld2q->mld2q_qrv = 2;
                mld2q->mld2q_nsrcs = htons(llqt_srcs);
                mld2q->mld2q_qqic = brmctx->multicast_query_interval / HZ;
                mld2q->mld2q_mca = *group;
                csum = &mld2q->mld2q_cksum;
                csum_start = (void *)mld2q;
                if (!pg || !with_srcs)
                        break;

                llqt_srcs = 0;
                hlist_for_each_entry(ent, &pg->src_list, node) {
                        if (over_llqt == time_after(ent->timer.expires,
                                                    llqt) &&
                            ent->src_query_rexmit_cnt > 0) {
                                mld2q->mld2q_srcs[llqt_srcs++] = ent->addr.src.ip6;
                                ent->src_query_rexmit_cnt--;
                                if (need_rexmit && ent->src_query_rexmit_cnt)
                                        *need_rexmit = true;
                        }
                }
                if (WARN_ON(llqt_srcs != ntohs(mld2q->mld2q_nsrcs))) {
                        kfree_skb(skb);
                        return NULL;
                }
                break;
        }

        if (WARN_ON(!csum || !csum_start)) {
                kfree_skb(skb);
                return NULL;
        }

        *csum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, mld_hdr_size,
                                IPPROTO_ICMPV6,
                                csum_partial(csum_start, mld_hdr_size, 0));
        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_mcast *brmctx,
                                                struct net_bridge_mcast_port *pmctx,
                                                struct net_bridge_port_group *pg,
                                                struct br_ip *ip_dst,
                                                struct br_ip *group,
                                                bool with_srcs, bool over_lmqt,
                                                u8 sflag, u8 *igmp_type,
                                                bool *need_rexmit)
{
        __be32 ip4_dst;

        switch (group->proto) {
        case htons(ETH_P_IP):
                ip4_dst = ip_dst ? ip_dst->dst.ip4 : htonl(INADDR_ALLHOSTS_GROUP);
                return br_ip4_multicast_alloc_query(brmctx, pmctx, pg,
                                                    ip4_dst, group->dst.ip4,
                                                    with_srcs, over_lmqt,
                                                    sflag, igmp_type,
                                                    need_rexmit);
#if IS_ENABLED(CONFIG_IPV6)
        case htons(ETH_P_IPV6): {
                struct in6_addr ip6_dst;

                if (ip_dst)
                        ip6_dst = ip_dst->dst.ip6;
                else
                        ipv6_addr_set(&ip6_dst, htonl(0xff020000), 0, 0,
                                      htonl(1));

                return br_ip6_multicast_alloc_query(brmctx, pmctx, pg,
                                                    &ip6_dst, &group->dst.ip6,
                                                    with_srcs, over_lmqt,
                                                    sflag, igmp_type,
                                                    need_rexmit);
        }
#endif
        }
        return NULL;
}

struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
                                                    struct br_ip *group)
{
        struct net_bridge_mdb_entry *mp;
        int err;

        mp = br_mdb_ip_get(br, group);
        if (mp)
                return mp;

        if (atomic_read(&br->mdb_hash_tbl.nelems) >= br->hash_max) {
                br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false);
                return ERR_PTR(-E2BIG);
        }

        mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
        if (unlikely(!mp))
                return ERR_PTR(-ENOMEM);

        mp->br = br;
        mp->addr = *group;
        mp->mcast_gc.destroy = br_multicast_destroy_mdb_entry;
        timer_setup(&mp->timer, br_multicast_group_expired, 0);
        err = rhashtable_lookup_insert_fast(&br->mdb_hash_tbl, &mp->rhnode,
                                            br_mdb_rht_params);
        if (err) {
                kfree(mp);
                mp = ERR_PTR(err);
        } else {
                hlist_add_head_rcu(&mp->mdb_node, &br->mdb_list);
        }

        return mp;
}

static void br_multicast_group_src_expired(struct timer_list *t)
{
        struct net_bridge_group_src *src = from_timer(src, t, timer);
        struct net_bridge_port_group *pg;
        struct net_bridge *br = src->br;

        spin_lock(&br->multicast_lock);
        if (hlist_unhashed(&src->node) || !netif_running(br->dev) ||
            timer_pending(&src->timer))
                goto out;

        pg = src->pg;
        if (pg->filter_mode == MCAST_INCLUDE) {
                br_multicast_del_group_src(src, false);
                if (!hlist_empty(&pg->src_list))
                        goto out;
                br_multicast_find_del_pg(br, pg);
        } else {
                br_multicast_fwd_src_handle(src);
        }

out:
        spin_unlock(&br->multicast_lock);
}

struct net_bridge_group_src *
br_multicast_find_group_src(struct net_bridge_port_group *pg, struct br_ip *ip)
{
        struct net_bridge_group_src *ent;

        switch (ip->proto) {
        case htons(ETH_P_IP):
                hlist_for_each_entry(ent, &pg->src_list, node)
                        if (ip->src.ip4 == ent->addr.src.ip4)
                                return ent;
                break;
#if IS_ENABLED(CONFIG_IPV6)
        case htons(ETH_P_IPV6):
                hlist_for_each_entry(ent, &pg->src_list, node)
                        if (!ipv6_addr_cmp(&ent->addr.src.ip6, &ip->src.ip6))
                                return ent;
                break;
#endif
        }

        return NULL;
}

static struct net_bridge_group_src *
br_multicast_new_group_src(struct net_bridge_port_group *pg, struct br_ip *src_ip)
{
        struct net_bridge_group_src *grp_src;

        if (unlikely(pg->src_ents >= PG_SRC_ENT_LIMIT))
                return NULL;

        switch (src_ip->proto) {
        case htons(ETH_P_IP):
                if (ipv4_is_zeronet(src_ip->src.ip4) ||
                    ipv4_is_multicast(src_ip->src.ip4))
                        return NULL;
                break;
#if IS_ENABLED(CONFIG_IPV6)
        case htons(ETH_P_IPV6):
                if (ipv6_addr_any(&src_ip->src.ip6) ||
                    ipv6_addr_is_multicast(&src_ip->src.ip6))
                        return NULL;
                break;
#endif
        }

        grp_src = kzalloc(sizeof(*grp_src), GFP_ATOMIC);
        if (unlikely(!grp_src))
                return NULL;

        grp_src->pg = pg;
        grp_src->br = pg->key.port->br;
        grp_src->addr = *src_ip;
        grp_src->mcast_gc.destroy = br_multicast_destroy_group_src;
        timer_setup(&grp_src->timer, br_multicast_group_src_expired, 0);

        hlist_add_head_rcu(&grp_src->node, &pg->src_list);
        pg->src_ents++;

        return grp_src;
}

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,
                        u8 filter_mode,
                        u8 rt_protocol)
{
        struct net_bridge_port_group *p;

        p = kzalloc(sizeof(*p), GFP_ATOMIC);
        if (unlikely(!p))
                return NULL;

        p->key.addr = *group;
        p->key.port = port;
        p->flags = flags;
        p->filter_mode = filter_mode;
        p->rt_protocol = rt_protocol;
        p->eht_host_tree = RB_ROOT;
        p->eht_set_tree = RB_ROOT;
        p->mcast_gc.destroy = br_multicast_destroy_port_group;
        INIT_HLIST_HEAD(&p->src_list);

        if (!br_multicast_is_star_g(group) &&
            rhashtable_lookup_insert_fast(&port->br->sg_port_tbl, &p->rhnode,
                                          br_sg_port_rht_params)) {
                kfree(p);
                return NULL;
        }

        rcu_assign_pointer(p->next, next);
        timer_setup(&p->timer, br_multicast_port_group_expired, 0);
        timer_setup(&p->rexmit_timer, br_multicast_port_group_rexmit, 0);
        hlist_add_head(&p->mglist, &port->mglist);

        if (src)
                memcpy(p->eth_addr, src, ETH_ALEN);
        else
                eth_broadcast_addr(p->eth_addr);

        return p;
}

void br_multicast_host_join(struct net_bridge_mdb_entry *mp, bool notify)
{
        if (!mp->host_joined) {
                mp->host_joined = true;
                if (br_multicast_is_star_g(&mp->addr))
                        br_multicast_star_g_host_state(mp);
                if (notify)
                        br_mdb_notify(mp->br->dev, mp, NULL, RTM_NEWMDB);
        }

        if (br_group_is_l2(&mp->addr))
                return;

        mod_timer(&mp->timer,
                  jiffies + mp->br->multicast_ctx.multicast_membership_interval);
}

void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify)
{
        if (!mp->host_joined)
                return;

        mp->host_joined = false;
        if (br_multicast_is_star_g(&mp->addr))
                br_multicast_star_g_host_state(mp);
        if (notify)
                br_mdb_notify(mp->br->dev, mp, NULL, RTM_DELMDB);
}

static struct net_bridge_port_group *
__br_multicast_add_group(struct net_bridge_mcast *brmctx,
                         struct net_bridge_mcast_port *pmctx,
                         struct br_ip *group,
                         const unsigned char *src,
                         u8 filter_mode,
                         bool igmpv2_mldv1,
                         bool blocked)
{
        struct net_bridge_port_group __rcu **pp;
        struct net_bridge_port_group *p = NULL;
        struct net_bridge_mdb_entry *mp;
        unsigned long now = jiffies;

        if (!br_multicast_ctx_should_use(brmctx, pmctx))
                goto out;

        mp = br_multicast_new_group(brmctx->br, group);
        if (IS_ERR(mp))
                return ERR_CAST(mp);

        if (!pmctx) {
                br_multicast_host_join(mp, true);
                goto out;
        }

        for (pp = &mp->ports;
             (p = mlock_dereference(*pp, brmctx->br)) != NULL;
             pp = &p->next) {
                if (br_port_group_equal(p, pmctx->port, src))
                        goto found;
                if ((unsigned long)p->key.port < (unsigned long)pmctx->port)
                        break;
        }

        p = br_multicast_new_port_group(pmctx->port, group, *pp, 0, src,
                                        filter_mode, RTPROT_KERNEL);
        if (unlikely(!p)) {
                p = ERR_PTR(-ENOMEM);
                goto out;
        }
        rcu_assign_pointer(*pp, p);
        if (blocked)
                p->flags |= MDB_PG_FLAGS_BLOCKED;
        br_mdb_notify(brmctx->br->dev, mp, p, RTM_NEWMDB);

found:
        if (igmpv2_mldv1)
                mod_timer(&p->timer,
                          now + brmctx->multicast_membership_interval);

out:
        return p;
}

static int br_multicast_add_group(struct net_bridge_mcast *brmctx,
                                  struct net_bridge_mcast_port *pmctx,
                                  struct br_ip *group,
                                  const unsigned char *src,
                                  u8 filter_mode,
                                  bool igmpv2_mldv1)
{
        struct net_bridge_port_group *pg;
        int err;

        spin_lock(&brmctx->br->multicast_lock);
        pg = __br_multicast_add_group(brmctx, pmctx, group, src, filter_mode,
                                      igmpv2_mldv1, false);
        /* NULL is considered valid for host joined groups */
        err = PTR_ERR_OR_ZERO(pg);
        spin_unlock(&brmctx->br->multicast_lock);

        return err;
}

static int br_ip4_multicast_add_group(struct net_bridge_mcast *brmctx,
                                      struct net_bridge_mcast_port *pmctx,
                                      __be32 group,
                                      __u16 vid,
                                      const unsigned char *src,
                                      bool igmpv2)
{
        struct br_ip br_group;
        u8 filter_mode;

        if (ipv4_is_local_multicast(group))
                return 0;

        memset(&br_group, 0, sizeof(br_group));
        br_group.dst.ip4 = group;
        br_group.proto = htons(ETH_P_IP);
        br_group.vid = vid;
        filter_mode = igmpv2 ? MCAST_EXCLUDE : MCAST_INCLUDE;

        return br_multicast_add_group(brmctx, pmctx, &br_group, src,
                                      filter_mode, igmpv2);
}

#if IS_ENABLED(CONFIG_IPV6)
static int br_ip6_multicast_add_group(struct net_bridge_mcast *brmctx,
                                      struct net_bridge_mcast_port *pmctx,
                                      const struct in6_addr *group,
                                      __u16 vid,
                                      const unsigned char *src,
                                      bool mldv1)
{
        struct br_ip br_group;
        u8 filter_mode;

        if (ipv6_addr_is_ll_all_nodes(group))
                return 0;

        memset(&br_group, 0, sizeof(br_group));
        br_group.dst.ip6 = *group;
        br_group.proto = htons(ETH_P_IPV6);
        br_group.vid = vid;
        filter_mode = mldv1 ? MCAST_EXCLUDE : MCAST_INCLUDE;

        return br_multicast_add_group(brmctx, pmctx, &br_group, src,
                                      filter_mode, mldv1);
}
#endif

static bool br_multicast_rport_del(struct hlist_node *rlist)
{
        if (hlist_unhashed(rlist))
                return false;

        hlist_del_init_rcu(rlist);
        return true;
}

static bool br_ip4_multicast_rport_del(struct net_bridge_mcast_port *pmctx)
{
        return br_multicast_rport_del(&pmctx->ip4_rlist);
}

static bool br_ip6_multicast_rport_del(struct net_bridge_mcast_port *pmctx)
{
#if IS_ENABLED(CONFIG_IPV6)
        return br_multicast_rport_del(&pmctx->ip6_rlist);
#else
        return false;
#endif
}

static void br_multicast_router_expired(struct net_bridge_mcast_port *pmctx,
                                        struct timer_list *t,
                                        struct hlist_node *rlist)
{
        struct net_bridge *br = pmctx->port->br;
        bool del;

        spin_lock(&br->multicast_lock);
        if (pmctx->multicast_router == MDB_RTR_TYPE_DISABLED ||
            pmctx->multicast_router == MDB_RTR_TYPE_PERM ||
            timer_pending(t))
                goto out;

        del = br_multicast_rport_del(rlist);
        br_multicast_rport_del_notify(pmctx, del);
out:
        spin_unlock(&br->multicast_lock);
}

static void br_ip4_multicast_router_expired(struct timer_list *t)
{
        struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t,
                                                         ip4_mc_router_timer);

        br_multicast_router_expired(pmctx, t, &pmctx->ip4_rlist);
}

#if IS_ENABLED(CONFIG_IPV6)
static void br_ip6_multicast_router_expired(struct timer_list *t)
{
        struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t,
                                                         ip6_mc_router_timer);

        br_multicast_router_expired(pmctx, t, &pmctx->ip6_rlist);
}
#endif

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, NULL);
}

static void br_multicast_local_router_expired(struct net_bridge_mcast *brmctx,
                                              struct timer_list *timer)
{
        spin_lock(&brmctx->br->multicast_lock);
        if (brmctx->multicast_router == MDB_RTR_TYPE_DISABLED ||
            brmctx->multicast_router == MDB_RTR_TYPE_PERM ||
            br_ip4_multicast_is_router(brmctx) ||
            br_ip6_multicast_is_router(brmctx))
                goto out;

        br_mc_router_state_change(brmctx->br, false);
out:
        spin_unlock(&brmctx->br->multicast_lock);
}

static void br_ip4_multicast_local_router_expired(struct timer_list *t)
{
        struct net_bridge_mcast *brmctx = from_timer(brmctx, t,
                                                     ip4_mc_router_timer);

        br_multicast_local_router_expired(brmctx, t);
}

#if IS_ENABLED(CONFIG_IPV6)
static void br_ip6_multicast_local_router_expired(struct timer_list *t)
{
        struct net_bridge_mcast *brmctx = from_timer(brmctx, t,
                                                     ip6_mc_router_timer);

        br_multicast_local_router_expired(brmctx, t);
}
#endif

static void br_multicast_querier_expired(struct net_bridge_mcast *brmctx,
                                         struct bridge_mcast_own_query *query)
{
        spin_lock(&brmctx->br->multicast_lock);
        if (!netif_running(brmctx->br->dev) ||
            br_multicast_ctx_vlan_global_disabled(brmctx) ||
            !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED))
                goto out;

        br_multicast_start_querier(brmctx, query);

out:
        spin_unlock(&brmctx->br->multicast_lock);
}

static void br_ip4_multicast_querier_expired(struct timer_list *t)
{
        struct net_bridge_mcast *brmctx = from_timer(brmctx, t,
                                                     ip4_other_query.timer);

        br_multicast_querier_expired(brmctx, &brmctx->ip4_own_query);
}

#if IS_ENABLED(CONFIG_IPV6)
static void br_ip6_multicast_querier_expired(struct timer_list *t)
{
        struct net_bridge_mcast *brmctx = from_timer(brmctx, t,
                                                     ip6_other_query.timer);

        br_multicast_querier_expired(brmctx, &brmctx->ip6_own_query);
}
#endif

static void br_multicast_select_own_querier(struct net_bridge_mcast *brmctx,
                                            struct br_ip *ip,
                                            struct sk_buff *skb)
{
        if (ip->proto == htons(ETH_P_IP))
                brmctx->ip4_querier.addr.src.ip4 = ip_hdr(skb)->saddr;
#if IS_ENABLED(CONFIG_IPV6)
        else
                brmctx->ip6_querier.addr.src.ip6 = ipv6_hdr(skb)->saddr;
#endif
}

static void __br_multicast_send_query(struct net_bridge_mcast *brmctx,
                                      struct net_bridge_mcast_port *pmctx,
                                      struct net_bridge_port_group *pg,
                                      struct br_ip *ip_dst,
                                      struct br_ip *group,
                                      bool with_srcs,
                                      u8 sflag,
                                      bool *need_rexmit)
{
        bool over_lmqt = !!sflag;
        struct sk_buff *skb;
        u8 igmp_type;

        if (!br_multicast_ctx_should_use(brmctx, pmctx))
                return;

again_under_lmqt:
        skb = br_multicast_alloc_query(brmctx, pmctx, pg, ip_dst, group,
                                       with_srcs, over_lmqt, sflag, &igmp_type,
                                       need_rexmit);
        if (!skb)
                return;

        if (pmctx) {
                skb->dev = pmctx->port->dev;
                br_multicast_count(brmctx->br, pmctx->port, skb, igmp_type,
                                   BR_MCAST_DIR_TX);
                NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
                        dev_net(pmctx->port->dev), NULL, skb, NULL, skb->dev,
                        br_dev_queue_push_xmit);

                if (over_lmqt && with_srcs && sflag) {
                        over_lmqt = false;
                        goto again_under_lmqt;
                }
        } else {
                br_multicast_select_own_querier(brmctx, group, skb);
                br_multicast_count(brmctx->br, NULL, skb, igmp_type,
                                   BR_MCAST_DIR_RX);
                netif_rx(skb);
        }
}

static void br_multicast_send_query(struct net_bridge_mcast *brmctx,
                                    struct net_bridge_mcast_port *pmctx,
                                    struct bridge_mcast_own_query *own_query)
{
        struct bridge_mcast_other_query *other_query = NULL;
        struct br_ip br_group;
        unsigned long time;

        if (!br_multicast_ctx_should_use(brmctx, pmctx) ||
            !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED) ||
            !br_opt_get(brmctx->br, BROPT_MULTICAST_QUERIER))
                return;

        memset(&br_group.dst, 0, sizeof(br_group.dst));

        if (pmctx ? (own_query == &pmctx->ip4_own_query) :
                    (own_query == &brmctx->ip4_own_query)) {
                other_query = &brmctx->ip4_other_query;
                br_group.proto = htons(ETH_P_IP);
#if IS_ENABLED(CONFIG_IPV6)
        } else {
                other_query = &brmctx->ip6_other_query;
                br_group.proto = htons(ETH_P_IPV6);
#endif
        }

        if (!other_query || timer_pending(&other_query->timer))
                return;

        __br_multicast_send_query(brmctx, pmctx, NULL, NULL, &br_group, false,
                                  0, NULL);

        time = jiffies;
        time += own_query->startup_sent < brmctx->multicast_startup_query_count ?
                brmctx->multicast_startup_query_interval :
                brmctx->multicast_query_interval;
        mod_timer(&own_query->timer, time);
}

static void
br_multicast_port_query_expired(struct net_bridge_mcast_port *pmctx,
                                struct bridge_mcast_own_query *query)
{
        struct net_bridge *br = pmctx->port->br;
        struct net_bridge_mcast *brmctx;

        spin_lock(&br->multicast_lock);
        if (br_multicast_port_ctx_state_stopped(pmctx))
                goto out;

        brmctx = br_multicast_port_ctx_get_global(pmctx);
        if (query->startup_sent < brmctx->multicast_startup_query_count)
                query->startup_sent++;

        br_multicast_send_query(brmctx, pmctx, query);

out:
        spin_unlock(&br->multicast_lock);
}

static void br_ip4_multicast_port_query_expired(struct timer_list *t)
{
        struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t,
                                                         ip4_own_query.timer);

        br_multicast_port_query_expired(pmctx, &pmctx->ip4_own_query);
}

#if IS_ENABLED(CONFIG_IPV6)
static void br_ip6_multicast_port_query_expired(struct timer_list *t)
{
        struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t,
                                                         ip6_own_query.timer);

        br_multicast_port_query_expired(pmctx, &pmctx->ip6_own_query);
}
#endif

static void br_multicast_port_group_rexmit(struct timer_list *t)
{
        struct net_bridge_port_group *pg = from_timer(pg, t, rexmit_timer);
        struct bridge_mcast_other_query *other_query = NULL;
        struct net_bridge *br = pg->key.port->br;
        struct net_bridge_mcast_port *pmctx;
        struct net_bridge_mcast *brmctx;
        bool need_rexmit = false;

        spin_lock(&br->multicast_lock);
        if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) ||
            !br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
            !br_opt_get(br, BROPT_MULTICAST_QUERIER))
                goto out;

        pmctx = br_multicast_pg_to_port_ctx(pg);
        if (!pmctx)
                goto out;
        brmctx = br_multicast_port_ctx_get_global(pmctx);
        if (pg->key.addr.proto == htons(ETH_P_IP))
                other_query = &brmctx->ip4_other_query;
#if IS_ENABLED(CONFIG_IPV6)
        else
                other_query = &brmctx->ip6_other_query;
#endif

        if (!other_query || timer_pending(&other_query->timer))
                goto out;

        if (pg->grp_query_rexmit_cnt) {
                pg->grp_query_rexmit_cnt--;
                __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr,
                                          &pg->key.addr, false, 1, NULL);
        }
        __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr,
                                  &pg->key.addr, true, 0, &need_rexmit);

        if (pg->grp_query_rexmit_cnt || need_rexmit)
                mod_timer(&pg->rexmit_timer, jiffies +
                                             brmctx->multicast_last_member_interval);
out:
        spin_unlock(&br->multicast_lock);
}

static int br_mc_disabled_update(struct net_device *dev, bool value,
                                 struct netlink_ext_ack *extack)
{
        struct switchdev_attr attr = {
                .orig_dev = dev,
                .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
                .flags = SWITCHDEV_F_DEFER,
                .u.mc_disabled = !value,
        };

        return switchdev_port_attr_set(dev, &attr, extack);
}

void br_multicast_port_ctx_init(struct net_bridge_port *port,
                                struct net_bridge_vlan *vlan,
                                struct net_bridge_mcast_port *pmctx)
{
        pmctx->port = port;
        pmctx->vlan = vlan;
        pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
        timer_setup(&pmctx->ip4_mc_router_timer,
                    br_ip4_multicast_router_expired, 0);
        timer_setup(&pmctx->ip4_own_query.timer,
                    br_ip4_multicast_port_query_expired, 0);
#if IS_ENABLED(CONFIG_IPV6)
        timer_setup(&pmctx->ip6_mc_router_timer,
                    br_ip6_multicast_router_expired, 0);
        timer_setup(&pmctx->ip6_own_query.timer,
                    br_ip6_multicast_port_query_expired, 0);
#endif
}

void br_multicast_port_ctx_deinit(struct net_bridge_mcast_port *pmctx)
{
#if IS_ENABLED(CONFIG_IPV6)
        del_timer_sync(&pmctx->ip6_mc_router_timer);
#endif
        del_timer_sync(&pmctx->ip4_mc_router_timer);
}

int br_multicast_add_port(struct net_bridge_port *port)
{
        int err;

        port->multicast_eht_hosts_limit = BR_MCAST_DEFAULT_EHT_HOSTS_LIMIT;
        br_multicast_port_ctx_init(port, NULL, &port->multicast_ctx);

        err = br_mc_disabled_update(port->dev,
                                    br_opt_get(port->br,
                                               BROPT_MULTICAST_ENABLED),
                                    NULL);
        if (err && err != -EOPNOTSUPP)
                return err;

        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;
        HLIST_HEAD(deleted_head);
        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_find_del_pg(br, pg);
        hlist_move_list(&br->mcast_gc_list, &deleted_head);
        spin_unlock_bh(&br->multicast_lock);
        br_multicast_gc(&deleted_head);
        br_multicast_port_ctx_deinit(&port->multicast_ctx);
        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_ctx(struct net_bridge_mcast_port *pmctx)
{
        struct net_bridge *br = pmctx->port->br;
        struct net_bridge_mcast *brmctx;

        brmctx = br_multicast_port_ctx_get_global(pmctx);
        if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
            !netif_running(br->dev))
                return;

        br_multicast_enable(&pmctx->ip4_own_query);
#if IS_ENABLED(CONFIG_IPV6)
        br_multicast_enable(&pmctx->ip6_own_query);
#endif
        if (pmctx->multicast_router == MDB_RTR_TYPE_PERM) {
                br_ip4_multicast_add_router(brmctx, pmctx);
                br_ip6_multicast_add_router(brmctx, pmctx);
        }
}

void br_multicast_enable_port(struct net_bridge_port *port)
{
        struct net_bridge *br = port->br;

        spin_lock_bh(&br->multicast_lock);
        __br_multicast_enable_port_ctx(&port->multicast_ctx);
        spin_unlock_bh(&br->multicast_lock);
}

static void __br_multicast_disable_port_ctx(struct net_bridge_mcast_port *pmctx)
{
        struct net_bridge_port_group *pg;
        struct hlist_node *n;
        bool del = false;

        hlist_for_each_entry_safe(pg, n, &pmctx->port->mglist, mglist)
                if (!(pg->flags & MDB_PG_FLAGS_PERMANENT) &&
                    (!br_multicast_port_ctx_is_vlan(pmctx) ||
                     pg->key.addr.vid == pmctx->vlan->vid))
                        br_multicast_find_del_pg(pmctx->port->br, pg);

        del |= br_ip4_multicast_rport_del(pmctx);
        del_timer(&pmctx->ip4_mc_router_timer);
        del_timer(&pmctx->ip4_own_query.timer);
        del |= br_ip6_multicast_rport_del(pmctx);
#if IS_ENABLED(CONFIG_IPV6)
        del_timer(&pmctx->ip6_mc_router_timer);
        del_timer(&pmctx->ip6_own_query.timer);
#endif
        br_multicast_rport_del_notify(pmctx, del);
}

void br_multicast_disable_port(struct net_bridge_port *port)
{
        spin_lock_bh(&port->br->multicast_lock);
        __br_multicast_disable_port_ctx(&port->multicast_ctx);
        spin_unlock_bh(&port->br->multicast_lock);
}

static int __grp_src_delete_marked(struct net_bridge_port_group *pg)
{
        struct net_bridge_group_src *ent;
        struct hlist_node *tmp;
        int deleted = 0;

        hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node)
                if (ent->flags & BR_SGRP_F_DELETE) {
                        br_multicast_del_group_src(ent, false);
                        deleted++;
                }

        return deleted;
}

static void __grp_src_mod_timer(struct net_bridge_group_src *src,
                                unsigned long expires)
{
        mod_timer(&src->timer, expires);
        br_multicast_fwd_src_handle(src);
}

static void __grp_src_query_marked_and_rexmit(struct net_bridge_mcast *brmctx,
                                              struct net_bridge_mcast_port *pmctx,
                                              struct net_bridge_port_group *pg)
{
        struct bridge_mcast_other_query *other_query = NULL;
        u32 lmqc = brmctx->multicast_last_member_count;
        unsigned long lmqt, lmi, now = jiffies;
        struct net_bridge_group_src *ent;

        if (!netif_running(brmctx->br->dev) ||
            !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED))
                return;

        if (pg->key.addr.proto == htons(ETH_P_IP))
                other_query = &brmctx->ip4_other_query;
#if IS_ENABLED(CONFIG_IPV6)
        else
                other_query = &brmctx->ip6_other_query;
#endif

        lmqt = now + br_multicast_lmqt(brmctx);
        hlist_for_each_entry(ent, &pg->src_list, node) {
                if (ent->flags & BR_SGRP_F_SEND) {
                        ent->flags &= ~BR_SGRP_F_SEND;
                        if (ent->timer.expires > lmqt) {
                                if (br_opt_get(brmctx->br,
                                               BROPT_MULTICAST_QUERIER) &&
                                    other_query &&
                                    !timer_pending(&other_query->timer))
                                        ent->src_query_rexmit_cnt = lmqc;
                                __grp_src_mod_timer(ent, lmqt);
                        }
                }
        }

        if (!br_opt_get(brmctx->br, BROPT_MULTICAST_QUERIER) ||
            !other_query || timer_pending(&other_query->timer))
                return;

        __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr,
                                  &pg->key.addr, true, 1, NULL);

        lmi = now + brmctx->multicast_last_member_interval;
        if (!timer_pending(&pg->rexmit_timer) ||
            time_after(pg->rexmit_timer.expires, lmi))
                mod_timer(&pg->rexmit_timer, lmi);
}

static void __grp_send_query_and_rexmit(struct net_bridge_mcast *brmctx,
                                        struct net_bridge_mcast_port *pmctx,
                                        struct net_bridge_port_group *pg)
{
        struct bridge_mcast_other_query *other_query = NULL;
        unsigned long now = jiffies, lmi;

        if (!netif_running(brmctx->br->dev) ||
            !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED))
                return;

        if (pg->key.addr.proto == htons(ETH_P_IP))
                other_query = &brmctx->ip4_other_query;
#if IS_ENABLED(CONFIG_IPV6)
        else
                other_query = &brmctx->ip6_other_query;
#endif

        if (br_opt_get(brmctx->br, BROPT_MULTICAST_QUERIER) &&
            other_query && !timer_pending(&other_query->timer)) {
                lmi = now + brmctx->multicast_last_member_interval;
                pg->grp_query_rexmit_cnt = brmctx->multicast_last_member_count - 1;
                __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr,
                                          &pg->key.addr, false, 0, NULL);
                if (!timer_pending(&pg->rexmit_timer) ||
                    time_after(pg->rexmit_timer.expires, lmi))
                        mod_timer(&pg->rexmit_timer, lmi);
        }

        if (pg->filter_mode == MCAST_EXCLUDE &&
            (!timer_pending(&pg->timer) ||
             time_after(pg->timer.expires, now + br_multicast_lmqt(brmctx))))
                mod_timer(&pg->timer, now + br_multicast_lmqt(brmctx));
}

/* State          Msg type      New state                Actions
 * INCLUDE (A)    IS_IN (B)     INCLUDE (A+B)            (B)=GMI
 * INCLUDE (A)    ALLOW (B)     INCLUDE (A+B)            (B)=GMI
 * EXCLUDE (X,Y)  ALLOW (A)     EXCLUDE (X+A,Y-A)        (A)=GMI
 */
static bool br_multicast_isinc_allow(const struct net_bridge_mcast *brmctx,
                                     struct net_bridge_port_group *pg, void *h_addr,
                                     void *srcs, u32 nsrcs, size_t addr_size,
                                     int grec_type)
{
        struct net_bridge_group_src *ent;
        unsigned long now = jiffies;
        bool changed = false;
        struct br_ip src_ip;
        u32 src_idx;

        memset(&src_ip, 0, sizeof(src_ip));
        src_ip.proto = pg->key.addr.proto;
        for (src_idx = 0; src_idx < nsrcs; src_idx++) {
                memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
                ent = br_multicast_find_group_src(pg, &src_ip);
                if (!ent) {
                        ent = br_multicast_new_group_src(pg, &src_ip);
                        if (ent)
                                changed = true;
                }

                if (ent)
                        __grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx));
        }

        if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
                                    grec_type))
                changed = true;

        return changed;
}

/* State          Msg type      New state                Actions
 * INCLUDE (A)    IS_EX (B)     EXCLUDE (A*B,B-A)        (B-A)=0
 *                                                       Delete (A-B)
 *                                                       Group Timer=GMI
 */
static void __grp_src_isexc_incl(const struct net_bridge_mcast *brmctx,
                                 struct net_bridge_port_group *pg, void *h_addr,
                                 void *srcs, u32 nsrcs, size_t addr_size,
                                 int grec_type)
{
        struct net_bridge_group_src *ent;
        struct br_ip src_ip;
        u32 src_idx;

        hlist_for_each_entry(ent, &pg->src_list, node)
                ent->flags |= BR_SGRP_F_DELETE;

        memset(&src_ip, 0, sizeof(src_ip));
        src_ip.proto = pg->key.addr.proto;
        for (src_idx = 0; src_idx < nsrcs; src_idx++) {
                memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
                ent = br_multicast_find_group_src(pg, &src_ip);
                if (ent)
                        ent->flags &= ~BR_SGRP_F_DELETE;
                else
                        ent = br_multicast_new_group_src(pg, &src_ip);
                if (ent)
                        br_multicast_fwd_src_handle(ent);
        }

        br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
                                grec_type);

        __grp_src_delete_marked(pg);
}

/* State          Msg type      New state                Actions
 * EXCLUDE (X,Y)  IS_EX (A)     EXCLUDE (A-Y,Y*A)        (A-X-Y)=GMI
 *                                                       Delete (X-A)
 *                                                       Delete (Y-A)
 *                                                       Group Timer=GMI
 */
static bool __grp_src_isexc_excl(const struct net_bridge_mcast *brmctx,
                                 struct net_bridge_port_group *pg, void *h_addr,
                                 void *srcs, u32 nsrcs, size_t addr_size,
                                 int grec_type)
{
        struct net_bridge_group_src *ent;
        unsigned long now = jiffies;
        bool changed = false;
        struct br_ip src_ip;
        u32 src_idx;

        hlist_for_each_entry(ent, &pg->src_list, node)
                ent->flags |= BR_SGRP_F_DELETE;

        memset(&src_ip, 0, sizeof(src_ip));
        src_ip.proto = pg->key.addr.proto;
        for (src_idx = 0; src_idx < nsrcs; src_idx++) {
                memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
                ent = br_multicast_find_group_src(pg, &src_ip);
                if (ent) {
                        ent->flags &= ~BR_SGRP_F_DELETE;
                } else {
                        ent = br_multicast_new_group_src(pg, &src_ip);
                        if (ent) {
                                __grp_src_mod_timer(ent,
                                                    now + br_multicast_gmi(brmctx));
                                changed = true;
                        }
                }
        }

        if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
                                    grec_type))
                changed = true;

        if (__grp_src_delete_marked(pg))
                changed = true;

        return changed;
}

static bool br_multicast_isexc(const struct net_bridge_mcast *brmctx,
                               struct net_bridge_port_group *pg, void *h_addr,
                               void *srcs, u32 nsrcs, size_t addr_size,
                               int grec_type)
{
        bool changed = false;

        switch (pg->filter_mode) {
        case MCAST_INCLUDE:
                __grp_src_isexc_incl(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
                                     grec_type);
                br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE);
                changed = true;
                break;
        case MCAST_EXCLUDE:
                changed = __grp_src_isexc_excl(brmctx, pg, h_addr, srcs, nsrcs,
                                               addr_size, grec_type);
                break;
        }

        pg->filter_mode = MCAST_EXCLUDE;
        mod_timer(&pg->timer, jiffies + br_multicast_gmi(brmctx));

        return changed;
}

/* State          Msg type      New state                Actions
 * INCLUDE (A)    TO_IN (B)     INCLUDE (A+B)            (B)=GMI
 *                                                       Send Q(G,A-B)
 */
static bool __grp_src_toin_incl(struct net_bridge_mcast *brmctx,
                                struct net_bridge_mcast_port *pmctx,
                                struct net_bridge_port_group *pg, void *h_addr,
                                void *srcs, u32 nsrcs, size_t addr_size,
                                int grec_type)
{
        u32 src_idx, to_send = pg->src_ents;
        struct net_bridge_group_src *ent;
        unsigned long now = jiffies;
        bool changed = false;
        struct br_ip src_ip;

        hlist_for_each_entry(ent, &pg->src_list, node)
                ent->flags |= BR_SGRP_F_SEND;

        memset(&src_ip, 0, sizeof(src_ip));
        src_ip.proto = pg->key.addr.proto;
        for (src_idx = 0; src_idx < nsrcs; src_idx++) {
                memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
                ent = br_multicast_find_group_src(pg, &src_ip);
                if (ent) {
                        ent->flags &= ~BR_SGRP_F_SEND;
                        to_send--;
                } else {
                        ent = br_multicast_new_group_src(pg, &src_ip);
                        if (ent)
                                changed = true;
                }
                if (ent)
                        __grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx));
        }

        if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
                                    grec_type))
                changed = true;

        if (to_send)
                __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg);

        return changed;
}

/* State          Msg type      New state                Actions
 * EXCLUDE (X,Y)  TO_IN (A)     EXCLUDE (X+A,Y-A)        (A)=GMI
 *                                                       Send Q(G,X-A)
 *                                                       Send Q(G)
 */
static bool __grp_src_toin_excl(struct net_bridge_mcast *brmctx,
                                struct net_bridge_mcast_port *pmctx,
                                struct net_bridge_port_group *pg, void *h_addr,
                                void *srcs, u32 nsrcs, size_t addr_size,
                                int grec_type)
{
        u32 src_idx, to_send = pg->src_ents;
        struct net_bridge_group_src *ent;
        unsigned long now = jiffies;
        bool changed = false;
        struct br_ip src_ip;

        hlist_for_each_entry(ent, &pg->src_list, node)
                if (timer_pending(&ent->timer))
                        ent->flags |= BR_SGRP_F_SEND;

        memset(&src_ip, 0, sizeof(src_ip));
        src_ip.proto = pg->key.addr.proto;
        for (src_idx = 0; src_idx < nsrcs; src_idx++) {
                memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
                ent = br_multicast_find_group_src(pg, &src_ip);
                if (ent) {
                        if (timer_pending(&ent->timer)) {
                                ent->flags &= ~BR_SGRP_F_SEND;
                                to_send--;
                        }
                } else {
                        ent = br_multicast_new_group_src(pg, &src_ip);
                        if (ent)
                                changed = true;
                }
                if (ent)
                        __grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx));
        }

        if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
                                    grec_type))
                changed = true;

        if (to_send)
                __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg);

        __grp_send_query_and_rexmit(brmctx, pmctx, pg);

        return changed;
}

static bool br_multicast_toin(struct net_bridge_mcast *brmctx,
                              struct net_bridge_mcast_port *pmctx,
                              struct net_bridge_port_group *pg, void *h_addr,
                              void *srcs, u32 nsrcs, size_t addr_size,
                              int grec_type)
{
        bool changed = false;

        switch (pg->filter_mode) {
        case MCAST_INCLUDE:
                changed = __grp_src_toin_incl(brmctx, pmctx, pg, h_addr, srcs,
                                              nsrcs, addr_size, grec_type);
                break;
        case MCAST_EXCLUDE:
                changed = __grp_src_toin_excl(brmctx, pmctx, pg, h_addr, srcs,
                                              nsrcs, addr_size, grec_type);
                break;
        }

        if (br_multicast_eht_should_del_pg(pg)) {
                pg->flags |= MDB_PG_FLAGS_FAST_LEAVE;
                br_multicast_find_del_pg(pg->key.port->br, pg);
                /* a notification has already been sent and we shouldn't
                 * access pg after the delete so we have to return false
                 */
                changed = false;
        }

        return changed;
}

/* State          Msg type      New state                Actions
 * INCLUDE (A)    TO_EX (B)     EXCLUDE (A*B,B-A)        (B-A)=0
 *                                                       Delete (A-B)
 *                                                       Send Q(G,A*B)
 *                                                       Group Timer=GMI
 */
static void __grp_src_toex_incl(struct net_bridge_mcast *brmctx,
                                struct net_bridge_mcast_port *pmctx,
                                struct net_bridge_port_group *pg, void *h_addr,
                                void *srcs, u32 nsrcs, size_t addr_size,
                                int grec_type)
{
        struct net_bridge_group_src *ent;
        u32 src_idx, to_send = 0;
        struct br_ip src_ip;

        hlist_for_each_entry(ent, &pg->src_list, node)
                ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE;

        memset(&src_ip, 0, sizeof(src_ip));
        src_ip.proto = pg->key.addr.proto;
        for (src_idx = 0; src_idx < nsrcs; src_idx++) {
                memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
                ent = br_multicast_find_group_src(pg, &src_ip);
                if (ent) {
                        ent->flags = (ent->flags & ~BR_SGRP_F_DELETE) |
                                     BR_SGRP_F_SEND;
                        to_send++;
                } else {
                        ent = br_multicast_new_group_src(pg, &src_ip);
                }
                if (ent)
                        br_multicast_fwd_src_handle(ent);
        }

        br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
                                grec_type);

        __grp_src_delete_marked(pg);
        if (to_send)
                __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg);
}

/* State          Msg type      New state                Actions
 * EXCLUDE (X,Y)  TO_EX (A)     EXCLUDE (A-Y,Y*A)        (A-X-Y)=Group Timer
 *                                                       Delete (X-A)
 *                                                       Delete (Y-A)
 *                                                       Send Q(G,A-Y)
 *                                                       Group Timer=GMI
 */
static bool __grp_src_toex_excl(struct net_bridge_mcast *brmctx,
                                struct net_bridge_mcast_port *pmctx,
                                struct net_bridge_port_group *pg, void *h_addr,
                                void *srcs, u32 nsrcs, size_t addr_size,
                                int grec_type)
{
        struct net_bridge_group_src *ent;
        u32 src_idx, to_send = 0;
        bool changed = false;
        struct br_ip src_ip;

        hlist_for_each_entry(ent, &pg->src_list, node)
                ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE;

        memset(&src_ip, 0, sizeof(src_ip));
        src_ip.proto = pg->key.addr.proto;
        for (src_idx = 0; src_idx < nsrcs; src_idx++) {
                memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
                ent = br_multicast_find_group_src(pg, &src_ip);
                if (ent) {
                        ent->flags &= ~BR_SGRP_F_DELETE;
                } else {
                        ent = br_multicast_new_group_src(pg, &src_ip);
                        if (ent) {
                                __grp_src_mod_timer(ent, pg->timer.expires);
                                changed = true;
                        }
                }
                if (ent && timer_pending(&ent->timer)) {
                        ent->flags |= BR_SGRP_F_SEND;
                        to_send++;
                }
        }

        if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
                                    grec_type))
                changed = true;

        if (__grp_src_delete_marked(pg))
                changed = true;
        if (to_send)
                __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg);

        return changed;
}

static bool br_multicast_toex(struct net_bridge_mcast *brmctx,
                              struct net_bridge_mcast_port *pmctx,
                              struct net_bridge_port_group *pg, void *h_addr,
                              void *srcs, u32 nsrcs, size_t addr_size,
                              int grec_type)
{
        bool changed = false;

        switch (pg->filter_mode) {
        case MCAST_INCLUDE:
                __grp_src_toex_incl(brmctx, pmctx, pg, h_addr, srcs, nsrcs,
                                    addr_size, grec_type);
                br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE);
                changed = true;
                break;
        case MCAST_EXCLUDE:
                changed = __grp_src_toex_excl(brmctx, pmctx, pg, h_addr, srcs,
                                              nsrcs, addr_size, grec_type);
                break;
        }

        pg->filter_mode = MCAST_EXCLUDE;
        mod_timer(&pg->timer, jiffies + br_multicast_gmi(brmctx));

        return changed;
}

/* State          Msg type      New state                Actions
 * INCLUDE (A)    BLOCK (B)     INCLUDE (A)              Send Q(G,A*B)
 */
static bool __grp_src_block_incl(struct net_bridge_mcast *brmctx,
                                 struct net_bridge_mcast_port *pmctx,
                                 struct net_bridge_port_group *pg, void *h_addr,
                                 void *srcs, u32 nsrcs, size_t addr_size, int grec_type)
{
        struct net_bridge_group_src *ent;
        u32 src_idx, to_send = 0;
        bool changed = false;
        struct br_ip src_ip;

        hlist_for_each_entry(ent, &pg->src_list, node)
                ent->flags &= ~BR_SGRP_F_SEND;

        memset(&src_ip, 0, sizeof(src_ip));
        src_ip.proto = pg->key.addr.proto;
        for (src_idx = 0; src_idx < nsrcs; src_idx++) {
                memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
                ent = br_multicast_find_group_src(pg, &src_ip);
                if (ent) {
                        ent->flags |= BR_SGRP_F_SEND;
                        to_send++;
                }
        }

        if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
                                    grec_type))
                changed = true;

        if (to_send)
                __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg);

        return changed;
}

/* State          Msg type      New state                Actions
 * EXCLUDE (X,Y)  BLOCK (A)     EXCLUDE (X+(A-Y),Y)      (A-X-Y)=Group Timer
 *                                                       Send Q(G,A-Y)
 */
static bool __grp_src_block_excl(struct net_bridge_mcast *brmctx,
                                 struct net_bridge_mcast_port *pmctx,
                                 struct net_bridge_port_group *pg, void *h_addr,
                                 void *srcs, u32 nsrcs, size_t addr_size, int grec_type)
{
        struct net_bridge_group_src *ent;
        u32 src_idx, to_send = 0;
        bool changed = false;
        struct br_ip src_ip;

        hlist_for_each_entry(ent, &pg->src_list, node)
                ent->flags &= ~BR_SGRP_F_SEND;

        memset(&src_ip, 0, sizeof(src_ip));
        src_ip.proto = pg->key.addr.proto;
        for (src_idx = 0; src_idx < nsrcs; src_idx++) {
                memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
                ent = br_multicast_find_group_src(pg, &src_ip);
                if (!ent) {
                        ent = br_multicast_new_group_src(pg, &src_ip);
                        if (ent) {
                                __grp_src_mod_timer(ent, pg->timer.expires);
                                changed = true;
                        }
                }
                if (ent && timer_pending(&ent->timer)) {
                        ent->flags |= BR_SGRP_F_SEND;
                        to_send++;
                }
        }

        if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
                                    grec_type))
                changed = true;

        if (to_send)
                __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg);

        return changed;
}

static bool br_multicast_block(struct net_bridge_mcast *brmctx,
                               struct net_bridge_mcast_port *pmctx,
                               struct net_bridge_port_group *pg, void *h_addr,
                               void *srcs, u32 nsrcs, size_t addr_size, int grec_type)
{
        bool changed = false;

        switch (pg->filter_mode) {
        case MCAST_INCLUDE:
                changed = __grp_src_block_incl(brmctx, pmctx, pg, h_addr, srcs,
                                               nsrcs, addr_size, grec_type);
                break;
        case MCAST_EXCLUDE:
                changed = __grp_src_block_excl(brmctx, pmctx, pg, h_addr, srcs,
                                               nsrcs, addr_size, grec_type);
                break;
        }

        if ((pg->filter_mode == MCAST_INCLUDE && hlist_empty(&pg->src_list)) ||
            br_multicast_eht_should_del_pg(pg)) {
                if (br_multicast_eht_should_del_pg(pg))
                        pg->flags |= MDB_PG_FLAGS_FAST_LEAVE;
                br_multicast_find_del_pg(pg->key.port->br, pg);
                /* a notification has already been sent and we shouldn't
                 * access pg after the delete so we have to return false
                 */
                changed = false;
        }

        return changed;
}

static struct net_bridge_port_group *
br_multicast_find_port(struct net_bridge_mdb_entry *mp,
                       struct net_bridge_port *p,
                       const unsigned char *src)
{
        struct net_bridge *br __maybe_unused = mp->br;
        struct net_bridge_port_group *pg;

        for (pg = mlock_dereference(mp->ports, br);
             pg;
             pg = mlock_dereference(pg->next, br))
                if (br_port_group_equal(pg, p, src))
                        return pg;

        return NULL;
}

static int br_ip4_multicast_igmp3_report(struct net_bridge_mcast *brmctx,
                                         struct net_bridge_mcast_port *pmctx,
                                         struct sk_buff *skb,
                                         u16 vid)
{
        bool igmpv2 = brmctx->multicast_igmp_version == 2;
        struct net_bridge_mdb_entry *mdst;
        struct net_bridge_port_group *pg;
        const unsigned char *src;
        struct igmpv3_report *ih;
        struct igmpv3_grec *grec;
        int i, len, num, type;
        __be32 group, *h_addr;
        bool changed = false;
        int err = 0;
        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 (!ip_mc_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 (!ip_mc_may_pull(skb, len))
                        return -EINVAL;

                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 (nsrcs == 0 &&
                    (type == IGMPV3_CHANGE_TO_INCLUDE ||
                     type == IGMPV3_MODE_IS_INCLUDE)) {
                        if (!pmctx || igmpv2) {
                                br_ip4_multicast_leave_group(brmctx, pmctx,
                                                             group, vid, src);
                                continue;
                        }
                } else {
                        err = br_ip4_multicast_add_group(brmctx, pmctx, group,
                                                         vid, src, igmpv2);
                        if (err)
                                break;
                }

                if (!pmctx || igmpv2)
                        continue;

                spin_lock_bh(&brmctx->br->multicast_lock);
                if (!br_multicast_ctx_should_use(brmctx, pmctx))
                        goto unlock_continue;

                mdst = br_mdb_ip4_get(brmctx->br, group, vid);
                if (!mdst)
                        goto unlock_continue;
                pg = br_multicast_find_port(mdst, pmctx->port, src);
                if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT))
                        goto unlock_continue;
                /* reload grec and host addr */
                grec = (void *)(skb->data + len - sizeof(*grec) - (nsrcs * 4));
                h_addr = &ip_hdr(skb)->saddr;
                switch (type) {
                case IGMPV3_ALLOW_NEW_SOURCES:
                        changed = br_multicast_isinc_allow(brmctx, pg, h_addr,
                                                           grec->grec_src,
                                                           nsrcs, sizeof(__be32), type);
                        break;
                case IGMPV3_MODE_IS_INCLUDE:
                        changed = br_multicast_isinc_allow(brmctx, pg, h_addr,
                                                           grec->grec_src,
                                                           nsrcs, sizeof(__be32), type);
                        break;
                case IGMPV3_MODE_IS_EXCLUDE:
                        changed = br_multicast_isexc(brmctx, pg, h_addr,
                                                     grec->grec_src,
                                                     nsrcs, sizeof(__be32), type);
                        break;
                case IGMPV3_CHANGE_TO_INCLUDE:
                        changed = br_multicast_toin(brmctx, pmctx, pg, h_addr,
                                                    grec->grec_src,
                                                    nsrcs, sizeof(__be32), type);
                        break;
                case IGMPV3_CHANGE_TO_EXCLUDE:
                        changed = br_multicast_toex(brmctx, pmctx, pg, h_addr,
                                                    grec->grec_src,
                                                    nsrcs, sizeof(__be32), type);
                        break;
                case IGMPV3_BLOCK_OLD_SOURCES:
                        changed = br_multicast_block(brmctx, pmctx, pg, h_addr,
                                                     grec->grec_src,
                                                     nsrcs, sizeof(__be32), type);
                        break;
                }
                if (changed)
                        br_mdb_notify(brmctx->br->dev, mdst, pg, RTM_NEWMDB);
unlock_continue:
                spin_unlock_bh(&brmctx->br->multicast_lock);
        }

        return err;
}

#if IS_ENABLED(CONFIG_IPV6)
static int br_ip6_multicast_mld2_report(struct net_bridge_mcast *brmctx,
                                        struct net_bridge_mcast_port *pmctx,
                                        struct sk_buff *skb,
                                        u16 vid)
{
        bool mldv1 = brmctx->multicast_mld_version == 1;
        struct net_bridge_mdb_entry *mdst;
        struct net_bridge_port_group *pg;
        unsigned int nsrcs_offset;
        const unsigned char *src;
        struct icmp6hdr *icmp6h;
        struct in6_addr *h_addr;
        struct mld2_grec *grec;
        unsigned int grec_len;
        bool changed = false;
        int i, len, num;
        int err = 0;

        if (!ipv6_mc_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_offset = len + offsetof(struct mld2_grec, grec_nsrcs);

                if (skb_transport_offset(skb) + ipv6_transport_len(skb) <
                    nsrcs_offset + sizeof(__nsrcs))
                        return -EINVAL;

                _nsrcs = skb_header_pointer(skb, nsrcs_offset,
                                            sizeof(__nsrcs), &__nsrcs);
                if (!_nsrcs)
                        return -EINVAL;

                nsrcs = ntohs(*_nsrcs);
                grec_len = struct_size(grec, grec_src, nsrcs);

                if (!ipv6_mc_may_pull(skb, len + grec_len))
                        return -EINVAL;

                grec = (struct mld2_grec *)(skb->data + len);
                len += grec_len;

                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) {
                        if (!pmctx || mldv1) {
                                br_ip6_multicast_leave_group(brmctx, pmctx,
                                                             &grec->grec_mca,
                                                             vid, src);
                                continue;
                        }
                } else {
                        err = br_ip6_multicast_add_group(brmctx, pmctx,
                                                         &grec->grec_mca, vid,
                                                         src, mldv1);
                        if (err)
                                break;
                }

                if (!pmctx || mldv1)
                        continue;

                spin_lock_bh(&brmctx->br->multicast_lock);
                if (!br_multicast_ctx_should_use(brmctx, pmctx))
                        goto unlock_continue;

                mdst = br_mdb_ip6_get(brmctx->br, &grec->grec_mca, vid);
                if (!mdst)
                        goto unlock_continue;
                pg = br_multicast_find_port(mdst, pmctx->port, src);
                if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT))
                        goto unlock_continue;
                h_addr = &ipv6_hdr(skb)->saddr;
                switch (grec->grec_type) {
                case MLD2_ALLOW_NEW_SOURCES:
                        changed = br_multicast_isinc_allow(brmctx, pg, h_addr,
                                                           grec->grec_src, nsrcs,
                                                           sizeof(struct in6_addr),
                                                           grec->grec_type);
                        break;
                case MLD2_MODE_IS_INCLUDE:
                        changed = br_multicast_isinc_allow(brmctx, pg, h_addr,
                                                           grec->grec_src, nsrcs,
                                                           sizeof(struct in6_addr),
                                                           grec->grec_type);
                        break;
                case MLD2_MODE_IS_EXCLUDE:
                        changed = br_multicast_isexc(brmctx, pg, h_addr,
                                                     grec->grec_src, nsrcs,
                                                     sizeof(struct in6_addr),
                                                     grec->grec_type);
                        break;
                case MLD2_CHANGE_TO_INCLUDE:
                        changed = br_multicast_toin(brmctx, pmctx, pg, h_addr,
                                                    grec->grec_src, nsrcs,
                                                    sizeof(struct in6_addr),
                                                    grec->grec_type);
                        break;
                case MLD2_CHANGE_TO_EXCLUDE:
                        changed = br_multicast_toex(brmctx, pmctx, pg, h_addr,
                                                    grec->grec_src, nsrcs,
                                                    sizeof(struct in6_addr),
                                                    grec->grec_type);
                        break;
                case MLD2_BLOCK_OLD_SOURCES:
                        changed = br_multicast_block(brmctx, pmctx, pg, h_addr,
                                                     grec->grec_src, nsrcs,
                                                     sizeof(struct in6_addr),
                                                     grec->grec_type);
                        break;
                }
                if (changed)
                        br_mdb_notify(brmctx->br->dev, mdst, pg, RTM_NEWMDB);
unlock_continue:
                spin_unlock_bh(&brmctx->br->multicast_lock);
        }

        return err;
}
#endif

static bool br_ip4_multicast_select_querier(struct net_bridge_mcast *brmctx,
                                            struct net_bridge_port *port,
                                            __be32 saddr)
{
        if (!timer_pending(&brmctx->ip4_own_query.timer) &&
            !timer_pending(&brmctx->ip4_other_query.timer))
                goto update;

        if (!brmctx->ip4_querier.addr.src.ip4)
                goto update;

        if (ntohl(saddr) <= ntohl(brmctx->ip4_querier.addr.src.ip4))
                goto update;

        return false;

update:
        brmctx->ip4_querier.addr.src.ip4 = saddr;

        /* update protected by general multicast_lock by caller */
        rcu_assign_pointer(brmctx->ip4_querier.port, port);

        return true;
}

#if IS_ENABLED(CONFIG_IPV6)
static bool br_ip6_multicast_select_querier(struct net_bridge_mcast *brmctx,
                                            struct net_bridge_port *port,
                                            struct in6_addr *saddr)
{
        if (!timer_pending(&brmctx->ip6_own_query.timer) &&
            !timer_pending(&brmctx->ip6_other_query.timer))
                goto update;

        if (ipv6_addr_cmp(saddr, &brmctx->ip6_querier.addr.src.ip6) <= 0)
                goto update;

        return false;

update:
        brmctx->ip6_querier.addr.src.ip6 = *saddr;

        /* update protected by general multicast_lock by caller */
        rcu_assign_pointer(brmctx->ip6_querier.port, port);

        return true;
}
#endif

static void
br_multicast_update_query_timer(struct net_bridge_mcast *brmctx,
                                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 + brmctx->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, NULL);
}

static struct net_bridge_port *
br_multicast_rport_from_node(struct net_bridge_mcast *brmctx,
                             struct hlist_head *mc_router_list,
                             struct hlist_node *rlist)
{
        struct net_bridge_mcast_port *pmctx;

#if IS_ENABLED(CONFIG_IPV6)
        if (mc_router_list == &brmctx->ip6_mc_router_list)
                pmctx = hlist_entry(rlist, struct net_bridge_mcast_port,
                                    ip6_rlist);
        else
#endif
                pmctx = hlist_entry(rlist, struct net_bridge_mcast_port,
                                    ip4_rlist);

        return pmctx->port;
}

static struct hlist_node *
br_multicast_get_rport_slot(struct net_bridge_mcast *brmctx,
                            struct net_bridge_port *port,
                            struct hlist_head *mc_router_list)

{
        struct hlist_node *slot = NULL;
        struct net_bridge_port *p;
        struct hlist_node *rlist;

        hlist_for_each(rlist, mc_router_list) {
                p = br_multicast_rport_from_node(brmctx, mc_router_list, rlist);

                if ((unsigned long)port >= (unsigned long)p)
                        break;

                slot = rlist;
        }

        return slot;
}

static bool br_multicast_no_router_otherpf(struct net_bridge_mcast_port *pmctx,
                                           struct hlist_node *rnode)
{
#if IS_ENABLED(CONFIG_IPV6)
        if (rnode != &pmctx->ip6_rlist)
                return hlist_unhashed(&pmctx->ip6_rlist);
        else
                return hlist_unhashed(&pmctx->ip4_rlist);
#else
        return true;
#endif
}

/* 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_mcast *brmctx,
                                    struct net_bridge_mcast_port *pmctx,
                                    struct hlist_node *rlist,
                                    struct hlist_head *mc_router_list)
{
        struct hlist_node *slot;

        if (!hlist_unhashed(rlist))
                return;

        slot = br_multicast_get_rport_slot(brmctx, pmctx->port, mc_router_list);

        if (slot)
                hlist_add_behind_rcu(rlist, slot);
        else
                hlist_add_head_rcu(rlist, mc_router_list);

        /* For backwards compatibility for now, only notify if we
         * switched from no IPv4/IPv6 multicast router to a new
         * IPv4 or IPv6 multicast router.
         */
        if (br_multicast_no_router_otherpf(pmctx, rlist)) {
                br_rtr_notify(pmctx->port->br->dev, pmctx, RTM_NEWMDB);
                br_port_mc_router_state_change(pmctx->port, true);
        }
}

/* Add port to router_list
 *  list is maintained ordered by pointer value
 *  and locked by br->multicast_lock and RCU
 */
static void br_ip4_multicast_add_router(struct net_bridge_mcast *brmctx,
                                        struct net_bridge_mcast_port *pmctx)
{
        br_multicast_add_router(brmctx, pmctx, &pmctx->ip4_rlist,
                                &brmctx->ip4_mc_router_list);
}

/* Add port to router_list
 *  list is maintained ordered by pointer value
 *  and locked by br->multicast_lock and RCU
 */
static void br_ip6_multicast_add_router(struct net_bridge_mcast *brmctx,
                                        struct net_bridge_mcast_port *pmctx)
{
#if IS_ENABLED(CONFIG_IPV6)
        br_multicast_add_router(brmctx, pmctx, &pmctx->ip6_rlist,
                                &brmctx->ip6_mc_router_list);
#endif
}

static void br_multicast_mark_router(struct net_bridge_mcast *brmctx,
                                     struct net_bridge_mcast_port *pmctx,
                                     struct timer_list *timer,
                                     struct hlist_node *rlist,
                                     struct hlist_head *mc_router_list)
{
        unsigned long now = jiffies;

        if (!br_multicast_ctx_should_use(brmctx, pmctx))
                return;

        if (!pmctx) {
                if (brmctx->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
                        if (!br_ip4_multicast_is_router(brmctx) &&
                            !br_ip6_multicast_is_router(brmctx))
                                br_mc_router_state_change(brmctx->br, true);
                        mod_timer(timer, now + brmctx->multicast_querier_interval);
                }
                return;
        }

        if (pmctx->multicast_router == MDB_RTR_TYPE_DISABLED ||
            pmctx->multicast_router == MDB_RTR_TYPE_PERM)
                return;

        br_multicast_add_router(brmctx, pmctx, rlist, mc_router_list);
        mod_timer(timer, now + brmctx->multicast_querier_interval);
}

static void br_ip4_multicast_mark_router(struct net_bridge_mcast *brmctx,
                                         struct net_bridge_mcast_port *pmctx)
{
        struct timer_list *timer = &brmctx->ip4_mc_router_timer;
        struct hlist_node *rlist = NULL;

        if (pmctx) {
                timer = &pmctx->ip4_mc_router_timer;
                rlist = &pmctx->ip4_rlist;
        }

        br_multicast_mark_router(brmctx, pmctx, timer, rlist,
                                 &brmctx->ip4_mc_router_list);
}

static void br_ip6_multicast_mark_router(struct net_bridge_mcast *brmctx,
                                         struct net_bridge_mcast_port *pmctx)
{
#if IS_ENABLED(CONFIG_IPV6)
        struct timer_list *timer = &brmctx->ip6_mc_router_timer;
        struct hlist_node *rlist = NULL;

        if (pmctx) {
                timer = &pmctx->ip6_mc_router_timer;
                rlist = &pmctx->ip6_rlist;
        }

        br_multicast_mark_router(brmctx, pmctx, timer, rlist,
                                 &brmctx->ip6_mc_router_list);
#endif
}

static void
br_ip4_multicast_query_received(struct net_bridge_mcast *brmctx,
                                struct net_bridge_mcast_port *pmctx,
                                struct bridge_mcast_other_query *query,
                                struct br_ip *saddr,
                                unsigned long max_delay)
{
        if (!br_ip4_multicast_select_querier(brmctx, pmctx->port, saddr->src.ip4))
                return;

        br_multicast_update_query_timer(brmctx, query, max_delay);
        br_ip4_multicast_mark_router(brmctx, pmctx);
}

#if IS_ENABLED(CONFIG_IPV6)
static void
br_ip6_multicast_query_received(struct net_bridge_mcast *brmctx,
                                struct net_bridge_mcast_port *pmctx,
                                struct bridge_mcast_other_query *query,
                                struct br_ip *saddr,
                                unsigned long max_delay)
{
        if (!br_ip6_multicast_select_querier(brmctx, pmctx->port, &saddr->src.ip6))
                return;

        br_multicast_update_query_timer(brmctx, query, max_delay);
        br_ip6_multicast_mark_router(brmctx, pmctx);
}
#endif

static void br_ip4_multicast_query(struct net_bridge_mcast *brmctx,
                                   struct net_bridge_mcast_port *pmctx,
                                   struct sk_buff *skb,
                                   u16 vid)
{
        unsigned int transport_len = ip_transport_len(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 __rcu **pp;
        struct br_ip saddr;
        unsigned long max_delay;
        unsigned long now = jiffies;
        __be32 group;

        spin_lock(&brmctx->br->multicast_lock);
        if (!br_multicast_ctx_should_use(brmctx, pmctx))
                goto out;

        group = ih->group;

        if (transport_len == sizeof(*ih)) {
                max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);

                if (!max_delay) {
                        max_delay = 10 * HZ;
                        group = 0;
                }
        } else if (transport_len >= sizeof(*ih3)) {
                ih3 = igmpv3_query_hdr(skb);
                if (ih3->nsrcs ||
                    (brmctx->multicast_igmp_version == 3 && group &&
                     ih3->suppress))
                        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.src.ip4 = iph->saddr;

                br_ip4_multicast_query_received(brmctx, pmctx,
                                                &brmctx->ip4_other_query,
                                                &saddr, max_delay);
                goto out;
        }

        mp = br_mdb_ip4_get(brmctx->br, group, vid);
        if (!mp)
                goto out;

        max_delay *= brmctx->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, brmctx->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 &&
                    (brmctx->multicast_igmp_version == 2 ||
                     p->filter_mode == MCAST_EXCLUDE))
                        mod_timer(&p->timer, now + max_delay);
        }

out:
        spin_unlock(&brmctx->br->multicast_lock);
}

#if IS_ENABLED(CONFIG_IPV6)
static int br_ip6_multicast_query(struct net_bridge_mcast *brmctx,
                                  struct net_bridge_mcast_port *pmctx,
                                  struct sk_buff *skb,
                                  u16 vid)
{
        unsigned int transport_len = ipv6_transport_len(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;
        unsigned int offset = skb_transport_offset(skb);
        const struct in6_addr *group = NULL;
        bool is_general_query;
        int err = 0;

        spin_lock(&brmctx->br->multicast_lock);
        if (!br_multicast_ctx_should_use(brmctx, pmctx))
                goto out;

        if (transport_len == 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;
                if (brmctx->multicast_mld_version == 2 &&
                    !ipv6_addr_any(&mld2q->mld2q_mca) &&
                    mld2q->mld2q_suppress)
                        goto out;

                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.src.ip6 = ipv6_hdr(skb)->saddr;

                br_ip6_multicast_query_received(brmctx, pmctx,
                                                &brmctx->ip6_other_query,
                                                &saddr, max_delay);
                goto out;
        } else if (!group) {
                goto out;
        }

        mp = br_mdb_ip6_get(brmctx->br, group, vid);
        if (!mp)
                goto out;

        max_delay *= brmctx->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, brmctx->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 &&
                    (brmctx->multicast_mld_version == 1 ||
                     p->filter_mode == MCAST_EXCLUDE))
                        mod_timer(&p->timer, now + max_delay);
        }

out:
        spin_unlock(&brmctx->br->multicast_lock);
        return err;
}
#endif

static void
br_multicast_leave_group(struct net_bridge_mcast *brmctx,
                         struct net_bridge_mcast_port *pmctx,
                         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_entry *mp;
        struct net_bridge_port_group *p;
        unsigned long now;
        unsigned long time;

        spin_lock(&brmctx->br->multicast_lock);
        if (!br_multicast_ctx_should_use(brmctx, pmctx))
                goto out;

        mp = br_mdb_ip_get(brmctx->br, group);
        if (!mp)
                goto out;

        if (pmctx && (pmctx->port->flags & BR_MULTICAST_FAST_LEAVE)) {
                struct net_bridge_port_group __rcu **pp;

                for (pp = &mp->ports;
                     (p = mlock_dereference(*pp, brmctx->br)) != NULL;
                     pp = &p->next) {
                        if (!br_port_group_equal(p, pmctx->port, src))
                                continue;

                        if (p->flags & MDB_PG_FLAGS_PERMANENT)
                                break;

                        p->flags |= MDB_PG_FLAGS_FAST_LEAVE;
                        br_multicast_del_pg(mp, p, pp);
                }
                goto out;
        }

        if (timer_pending(&other_query->timer))
                goto out;

        if (br_opt_get(brmctx->br, BROPT_MULTICAST_QUERIER)) {
                __br_multicast_send_query(brmctx, pmctx, NULL, NULL, &mp->addr,
                                          false, 0, NULL);

                time = jiffies + brmctx->multicast_last_member_count *
                                 brmctx->multicast_last_member_interval;

                mod_timer(&own_query->timer, time);

                for (p = mlock_dereference(mp->ports, brmctx->br);
                     p != NULL;
                     p = mlock_dereference(p->next, brmctx->br)) {
                        if (!br_port_group_equal(p, pmctx->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 + brmctx->multicast_last_member_count *
                     brmctx->multicast_last_member_interval;

        if (!pmctx) {
                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, brmctx->br);
             p != NULL;
             p = mlock_dereference(p->next, brmctx->br)) {
                if (p->key.port != pmctx->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(&brmctx->br->multicast_lock);
}

static void br_ip4_multicast_leave_group(struct net_bridge_mcast *brmctx,
                                         struct net_bridge_mcast_port *pmctx,
                                         __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 = pmctx ? &pmctx->ip4_own_query : &brmctx->ip4_own_query;

        memset(&br_group, 0, sizeof(br_group));
        br_group.dst.ip4 = group;
        br_group.proto = htons(ETH_P_IP);
        br_group.vid = vid;

        br_multicast_leave_group(brmctx, pmctx, &br_group,
                                 &brmctx->ip4_other_query,
                                 own_query, src);
}

#if IS_ENABLED(CONFIG_IPV6)
static void br_ip6_multicast_leave_group(struct net_bridge_mcast *brmctx,
                                         struct net_bridge_mcast_port *pmctx,
                                         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 = pmctx ? &pmctx->ip6_own_query : &brmctx->ip6_own_query;

        memset(&br_group, 0, sizeof(br_group));
        br_group.dst.ip6 = *group;
        br_group.proto = htons(ETH_P_IPV6);
        br_group.vid = vid;

        br_multicast_leave_group(brmctx, pmctx, &br_group,
                                 &brmctx->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_opt_get(br, BROPT_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_mcast *brmctx,
                             struct net_bridge_mcast_port *pmctx,
                             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(&brmctx->br->multicast_lock);
        br_ip4_multicast_mark_router(brmctx, pmctx);
        spin_unlock(&brmctx->br->multicast_lock);
}

static int br_ip4_multicast_mrd_rcv(struct net_bridge_mcast *brmctx,
                                    struct net_bridge_mcast_port *pmctx,
                                    struct sk_buff *skb)
{
        if (ip_hdr(skb)->protocol != IPPROTO_IGMP ||
            igmp_hdr(skb)->type != IGMP_MRDISC_ADV)
                return -ENOMSG;

        spin_lock(&brmctx->br->multicast_lock);
        br_ip4_multicast_mark_router(brmctx, pmctx);
        spin_unlock(&brmctx->br->multicast_lock);

        return 0;
}

static int br_multicast_ipv4_rcv(struct net_bridge_mcast *brmctx,
                                 struct net_bridge_mcast_port *pmctx,
                                 struct sk_buff *skb,
                                 u16 vid)
{
        struct net_bridge_port *p = pmctx ? pmctx->port : NULL;
        const unsigned char *src;
        struct igmphdr *ih;
        int err;

        err = ip_mc_check_igmp(skb);

        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(brmctx, pmctx, skb);
                } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) {
                        br_ip4_multicast_mrd_rcv(brmctx, pmctx, skb);
                }

                return 0;
        } else if (err < 0) {
                br_multicast_err_count(brmctx->br, p, 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(brmctx, pmctx, ih->group, vid,
                                                 src, true);
                break;
        case IGMPV3_HOST_MEMBERSHIP_REPORT:
                err = br_ip4_multicast_igmp3_report(brmctx, pmctx, skb, vid);
                break;
        case IGMP_HOST_MEMBERSHIP_QUERY:
                br_ip4_multicast_query(brmctx, pmctx, skb, vid);
                break;
        case IGMP_HOST_LEAVE_MESSAGE:
                br_ip4_multicast_leave_group(brmctx, pmctx, ih->group, vid, src);
                break;
        }

        br_multicast_count(brmctx->br, p, skb, BR_INPUT_SKB_CB(skb)->igmp,
                           BR_MCAST_DIR_RX);

        return err;
}

#if IS_ENABLED(CONFIG_IPV6)
static void br_ip6_multicast_mrd_rcv(struct net_bridge_mcast *brmctx,
                                     struct net_bridge_mcast_port *pmctx,
                                     struct sk_buff *skb)
{
        if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV)
                return;

        spin_lock(&brmctx->br->multicast_lock);
        br_ip6_multicast_mark_router(brmctx, pmctx);
        spin_unlock(&brmctx->br->multicast_lock);
}

static int br_multicast_ipv6_rcv(struct net_bridge_mcast *brmctx,
                                 struct net_bridge_mcast_port *pmctx,
                                 struct sk_buff *skb,
                                 u16 vid)
{
        struct net_bridge_port *p = pmctx ? pmctx->port : NULL;
        const unsigned char *src;
        struct mld_msg *mld;
        int err;

        err = ipv6_mc_check_mld(skb);

        if (err == -ENOMSG || err == -ENODATA) {
                if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
                        BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
                if (err == -ENODATA &&
                    ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr))
                        br_ip6_multicast_mrd_rcv(brmctx, pmctx, skb);

                return 0;
        } else if (err < 0) {
                br_multicast_err_count(brmctx->br, p, 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(brmctx, pmctx, &mld->mld_mca,
                                                 vid, src, true);
                break;
        case ICMPV6_MLD2_REPORT:
                err = br_ip6_multicast_mld2_report(brmctx, pmctx, skb, vid);
                break;
        case ICMPV6_MGM_QUERY:
                err = br_ip6_multicast_query(brmctx, pmctx, skb, vid);
                break;
        case ICMPV6_MGM_REDUCTION:
                src = eth_hdr(skb)->h_source;
                br_ip6_multicast_leave_group(brmctx, pmctx, &mld->mld_mca, vid,
                                             src);
                break;
        }

        br_multicast_count(brmctx->br, p, skb, BR_INPUT_SKB_CB(skb)->igmp,
                           BR_MCAST_DIR_RX);

        return err;
}
#endif

int br_multicast_rcv(struct net_bridge_mcast **brmctx,
                     struct net_bridge_mcast_port **pmctx,
                     struct net_bridge_vlan *vlan,
                     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_opt_get((*brmctx)->br, BROPT_MULTICAST_ENABLED))
                return 0;

        if (br_opt_get((*brmctx)->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) && vlan) {
                const struct net_bridge_vlan *masterv;

                /* the vlan has the master flag set only when transmitting
                 * through the bridge device
                 */
                if (br_vlan_is_master(vlan)) {
                        masterv = vlan;
                        *brmctx = &vlan->br_mcast_ctx;
                        *pmctx = NULL;
                } else {
                        masterv = vlan->brvlan;
                        *brmctx = &vlan->brvlan->br_mcast_ctx;
                        *pmctx = &vlan->port_mcast_ctx;
                }

                if (!(masterv->priv_flags & BR_VLFLAG_GLOBAL_MCAST_ENABLED))
                        return 0;
        }

        switch (skb->protocol) {
        case htons(ETH_P_IP):
                ret = br_multicast_ipv4_rcv(*brmctx, *pmctx, skb, vid);
                break;
#if IS_ENABLED(CONFIG_IPV6)
        case htons(ETH_P_IPV6):
                ret = br_multicast_ipv6_rcv(*brmctx, *pmctx, skb, vid);
                break;
#endif
        }

        return ret;
}

static void br_multicast_query_expired(struct net_bridge_mcast *brmctx,
                                       struct bridge_mcast_own_query *query,
                                       struct bridge_mcast_querier *querier)
{
        spin_lock(&brmctx->br->multicast_lock);
        if (br_multicast_ctx_vlan_disabled(brmctx))
                goto out;

        if (query->startup_sent < brmctx->multicast_startup_query_count)
                query->startup_sent++;

        RCU_INIT_POINTER(querier->port, NULL);
        br_multicast_send_query(brmctx, NULL, query);
out:
        spin_unlock(&brmctx->br->multicast_lock);
}

static void br_ip4_multicast_query_expired(struct timer_list *t)
{
        struct net_bridge_mcast *brmctx = from_timer(brmctx, t,
                                                     ip4_own_query.timer);

        br_multicast_query_expired(brmctx, &brmctx->ip4_own_query,
                                   &brmctx->ip4_querier);
}

#if IS_ENABLED(CONFIG_IPV6)
static void br_ip6_multicast_query_expired(struct timer_list *t)
{
        struct net_bridge_mcast *brmctx = from_timer(brmctx, t,
                                                     ip6_own_query.timer);

        br_multicast_query_expired(brmctx, &brmctx->ip6_own_query,
                                   &brmctx->ip6_querier);
}
#endif

static void br_multicast_gc_work(struct work_struct *work)
{
        struct net_bridge *br = container_of(work, struct net_bridge,
                                             mcast_gc_work);
        HLIST_HEAD(deleted_head);

        spin_lock_bh(&br->multicast_lock);
        hlist_move_list(&br->mcast_gc_list, &deleted_head);
        spin_unlock_bh(&br->multicast_lock);

        br_multicast_gc(&deleted_head);
}

void br_multicast_ctx_init(struct net_bridge *br,
                           struct net_bridge_vlan *vlan,
                           struct net_bridge_mcast *brmctx)
{
        brmctx->br = br;
        brmctx->vlan = vlan;
        brmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
        brmctx->multicast_last_member_count = 2;
        brmctx->multicast_startup_query_count = 2;

        brmctx->multicast_last_member_interval = HZ;
        brmctx->multicast_query_response_interval = 10 * HZ;
        brmctx->multicast_startup_query_interval = 125 * HZ / 4;
        brmctx->multicast_query_interval = 125 * HZ;
        brmctx->multicast_querier_interval = 255 * HZ;
        brmctx->multicast_membership_interval = 260 * HZ;

        brmctx->ip4_other_query.delay_time = 0;
        brmctx->ip4_querier.port = NULL;
        brmctx->multicast_igmp_version = 2;
#if IS_ENABLED(CONFIG_IPV6)
        brmctx->multicast_mld_version = 1;
        brmctx->ip6_other_query.delay_time = 0;
        brmctx->ip6_querier.port = NULL;
#endif

        timer_setup(&brmctx->ip4_mc_router_timer,
                    br_ip4_multicast_local_router_expired, 0);
        timer_setup(&brmctx->ip4_other_query.timer,
                    br_ip4_multicast_querier_expired, 0);
        timer_setup(&brmctx->ip4_own_query.timer,
                    br_ip4_multicast_query_expired, 0);
#if IS_ENABLED(CONFIG_IPV6)
        timer_setup(&brmctx->ip6_mc_router_timer,
                    br_ip6_multicast_local_router_expired, 0);
        timer_setup(&brmctx->ip6_other_query.timer,
                    br_ip6_multicast_querier_expired, 0);
        timer_setup(&brmctx->ip6_own_query.timer,
                    br_ip6_multicast_query_expired, 0);
#endif
}

void br_multicast_ctx_deinit(struct net_bridge_mcast *brmctx)
{
        __br_multicast_stop(brmctx);
}

void br_multicast_init(struct net_bridge *br)
{
        br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX;

        br_multicast_ctx_init(br, NULL, &br->multicast_ctx);

        br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true);
        br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);

        spin_lock_init(&br->multicast_lock);
        INIT_HLIST_HEAD(&br->mdb_list);
        INIT_HLIST_HEAD(&br->mcast_gc_list);
        INIT_WORK(&br->mcast_gc_work, br_multicast_gc_work);
}

static void br_ip4_multicast_join_snoopers(struct net_bridge *br)
{
        struct in_device *in_dev = in_dev_get(br->dev);

        if (!in_dev)
                return;

        __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
        in_dev_put(in_dev);
}

#if IS_ENABLED(CONFIG_IPV6)
static void br_ip6_multicast_join_snoopers(struct net_bridge *br)
{
        struct in6_addr addr;

        ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
        ipv6_dev_mc_inc(br->dev, &addr);
}
#else
static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br)
{
}
#endif

void br_multicast_join_snoopers(struct net_bridge *br)
{
        br_ip4_multicast_join_snoopers(br);
        br_ip6_multicast_join_snoopers(br);
}

static void br_ip4_multicast_leave_snoopers(struct net_bridge *br)
{
        struct in_device *in_dev = in_dev_get(br->dev);

        if (WARN_ON(!in_dev))
                return;

        __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
        in_dev_put(in_dev);
}

#if IS_ENABLED(CONFIG_IPV6)
static void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
{
        struct in6_addr addr;

        ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
        ipv6_dev_mc_dec(br->dev, &addr);
}
#else
static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
{
}
#endif

void br_multicast_leave_snoopers(struct net_bridge *br)
{
        br_ip4_multicast_leave_snoopers(br);
        br_ip6_multicast_leave_snoopers(br);
}

static void __br_multicast_open_query(struct net_bridge *br,
                                      struct bridge_mcast_own_query *query)
{
        query->startup_sent = 0;

        if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
                return;

        mod_timer(&query->timer, jiffies);
}

static void __br_multicast_open(struct net_bridge_mcast *brmctx)
{
        __br_multicast_open_query(brmctx->br, &brmctx->ip4_own_query);
#if IS_ENABLED(CONFIG_IPV6)
        __br_multicast_open_query(brmctx->br, &brmctx->ip6_own_query);
#endif
}

void br_multicast_open(struct net_bridge *br)
{
        ASSERT_RTNL();

        if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) {
                struct net_bridge_vlan_group *vg;
                struct net_bridge_vlan *vlan;

                vg = br_vlan_group(br);
                if (vg) {
                        list_for_each_entry(vlan, &vg->vlan_list, vlist) {
                                struct net_bridge_mcast *brmctx;

                                brmctx = &vlan->br_mcast_ctx;
                                if (br_vlan_is_brentry(vlan) &&
                                    !br_multicast_ctx_vlan_disabled(brmctx))
                                        __br_multicast_open(&vlan->br_mcast_ctx);
                        }
                }
        }

        __br_multicast_open(&br->multicast_ctx);
}

static void __br_multicast_stop(struct net_bridge_mcast *brmctx)
{
        del_timer_sync(&brmctx->ip4_mc_router_timer);
        del_timer_sync(&brmctx->ip4_other_query.timer);
        del_timer_sync(&brmctx->ip4_own_query.timer);
#if IS_ENABLED(CONFIG_IPV6)
        del_timer_sync(&brmctx->ip6_mc_router_timer);
        del_timer_sync(&brmctx->ip6_other_query.timer);
        del_timer_sync(&brmctx->ip6_own_query.timer);
#endif
}

void br_multicast_toggle_one_vlan(struct net_bridge_vlan *vlan, bool on)
{
        struct net_bridge *br;

        /* it's okay to check for the flag without the multicast lock because it
         * can only change under RTNL -> multicast_lock, we need the latter to
         * sync with timers and packets
         */
        if (on == !!(vlan->priv_flags & BR_VLFLAG_MCAST_ENABLED))
                return;

        if (br_vlan_is_master(vlan)) {
                br = vlan->br;

                if (!br_vlan_is_brentry(vlan) ||
                    (on &&
                     br_multicast_ctx_vlan_global_disabled(&vlan->br_mcast_ctx)))
                        return;

                spin_lock_bh(&br->multicast_lock);
                vlan->priv_flags ^= BR_VLFLAG_MCAST_ENABLED;
                spin_unlock_bh(&br->multicast_lock);

                if (on)
                        __br_multicast_open(&vlan->br_mcast_ctx);
                else
                        __br_multicast_stop(&vlan->br_mcast_ctx);
        } else {
                struct net_bridge_mcast *brmctx;

                brmctx = br_multicast_port_ctx_get_global(&vlan->port_mcast_ctx);
                if (on && br_multicast_ctx_vlan_global_disabled(brmctx))
                        return;

                br = vlan->port->br;
                spin_lock_bh(&br->multicast_lock);
                vlan->priv_flags ^= BR_VLFLAG_MCAST_ENABLED;
                if (on)
                        __br_multicast_enable_port_ctx(&vlan->port_mcast_ctx);
                else
                        __br_multicast_disable_port_ctx(&vlan->port_mcast_ctx);
                spin_unlock_bh(&br->multicast_lock);
        }
}

void br_multicast_toggle_vlan(struct net_bridge_vlan *vlan, bool on)
{
        struct net_bridge_port *p;

        if (WARN_ON_ONCE(!br_vlan_is_master(vlan)))
                return;

        list_for_each_entry(p, &vlan->br->port_list, list) {
                struct net_bridge_vlan *vport;

                vport = br_vlan_find(nbp_vlan_group(p), vlan->vid);
                if (!vport)
                        continue;
                br_multicast_toggle_one_vlan(vport, on);
        }
}

int br_multicast_toggle_vlan_snooping(struct net_bridge *br, bool on,
                                      struct netlink_ext_ack *extack)
{
        struct net_bridge_vlan_group *vg;
        struct net_bridge_vlan *vlan;
        struct net_bridge_port *p;

        if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) == on)
                return 0;

        if (on && !br_opt_get(br, BROPT_VLAN_ENABLED)) {
                NL_SET_ERR_MSG_MOD(extack, "Cannot enable multicast vlan snooping with vlan filtering disabled");
                return -EINVAL;
        }

        vg = br_vlan_group(br);
        if (!vg)
                return 0;

        br_opt_toggle(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED, on);

        /* disable/enable non-vlan mcast contexts based on vlan snooping */
        if (on)
                __br_multicast_stop(&br->multicast_ctx);
        else
                __br_multicast_open(&br->multicast_ctx);
        list_for_each_entry(p, &br->port_list, list) {
                if (on)
                        br_multicast_disable_port(p);
                else
                        br_multicast_enable_port(p);
        }

        list_for_each_entry(vlan, &vg->vlan_list, vlist)
                br_multicast_toggle_vlan(vlan, on);

        return 0;
}

bool br_multicast_toggle_global_vlan(struct net_bridge_vlan *vlan, bool on)
{
        ASSERT_RTNL();

        /* BR_VLFLAG_GLOBAL_MCAST_ENABLED relies on eventual consistency and
         * requires only RTNL to change
         */
        if (on == !!(vlan->priv_flags & BR_VLFLAG_GLOBAL_MCAST_ENABLED))
                return false;

        vlan->priv_flags ^= BR_VLFLAG_GLOBAL_MCAST_ENABLED;
        br_multicast_toggle_vlan(vlan, on);

        return true;
}

void br_multicast_stop(struct net_bridge *br)
{
        ASSERT_RTNL();

        if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) {
                struct net_bridge_vlan_group *vg;
                struct net_bridge_vlan *vlan;

                vg = br_vlan_group(br);
                if (vg) {
                        list_for_each_entry(vlan, &vg->vlan_list, vlist) {
                                struct net_bridge_mcast *brmctx;

                                brmctx = &vlan->br_mcast_ctx;
                                if (br_vlan_is_brentry(vlan) &&
                                    !br_multicast_ctx_vlan_disabled(brmctx))
                                        __br_multicast_stop(&vlan->br_mcast_ctx);
                        }
                }
        }

        __br_multicast_stop(&br->multicast_ctx);
}

void br_multicast_dev_del(struct net_bridge *br)
{
        struct net_bridge_mdb_entry *mp;
        HLIST_HEAD(deleted_head);
        struct hlist_node *tmp;

        spin_lock_bh(&br->multicast_lock);
        hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node)
                br_multicast_del_mdb_entry(mp);
        hlist_move_list(&br->mcast_gc_list, &deleted_head);
        spin_unlock_bh(&br->multicast_lock);

        br_multicast_ctx_deinit(&br->multicast_ctx);
        br_multicast_gc(&deleted_head);
        cancel_work_sync(&br->mcast_gc_work);

        rcu_barrier();
}

int br_multicast_set_router(struct net_bridge *br, unsigned long val)
{
        struct net_bridge_mcast *brmctx = &br->multicast_ctx;
        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(&brmctx->ip4_mc_router_timer);
#if IS_ENABLED(CONFIG_IPV6)
                del_timer(&brmctx->ip6_mc_router_timer);
#endif
                brmctx->multicast_router = val;
                err = 0;
                break;
        case MDB_RTR_TYPE_TEMP_QUERY:
                if (brmctx->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
                        br_mc_router_state_change(br, false);
                brmctx->multicast_router = val;
                err = 0;
                break;
        }

        spin_unlock_bh(&br->multicast_lock);

        return err;
}

static void
br_multicast_rport_del_notify(struct net_bridge_mcast_port *pmctx, bool deleted)
{
        if (!deleted)
                return;

        /* For backwards compatibility for now, only notify if there is
         * no multicast router anymore for both IPv4 and IPv6.
         */
        if (!hlist_unhashed(&pmctx->ip4_rlist))
                return;
#if IS_ENABLED(CONFIG_IPV6)
        if (!hlist_unhashed(&pmctx->ip6_rlist))
                return;
#endif

        br_rtr_notify(pmctx->port->br->dev, pmctx, RTM_DELMDB);
        br_port_mc_router_state_change(pmctx->port, false);

        /* don't allow timer refresh */
        if (pmctx->multicast_router == MDB_RTR_TYPE_TEMP)
                pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
}

int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
{
        struct net_bridge_mcast *brmctx = &p->br->multicast_ctx;
        struct net_bridge_mcast_port *pmctx = &p->multicast_ctx;
        unsigned long now = jiffies;
        int err = -EINVAL;
        bool del = false;

        spin_lock(&p->br->multicast_lock);
        if (pmctx->multicast_router == val) {
                /* Refresh the temp router port timer */
                if (pmctx->multicast_router == MDB_RTR_TYPE_TEMP) {
                        mod_timer(&pmctx->ip4_mc_router_timer,
                                  now + brmctx->multicast_querier_interval);
#if IS_ENABLED(CONFIG_IPV6)
                        mod_timer(&pmctx->ip6_mc_router_timer,
                                  now + brmctx->multicast_querier_interval);
#endif
                }
                err = 0;
                goto unlock;
        }
        switch (val) {
        case MDB_RTR_TYPE_DISABLED:
                pmctx->multicast_router = MDB_RTR_TYPE_DISABLED;
                del |= br_ip4_multicast_rport_del(pmctx);
                del_timer(&pmctx->ip4_mc_router_timer);
                del |= br_ip6_multicast_rport_del(pmctx);
#if IS_ENABLED(CONFIG_IPV6)
                del_timer(&pmctx->ip6_mc_router_timer);
#endif
                br_multicast_rport_del_notify(pmctx, del);
                break;
        case MDB_RTR_TYPE_TEMP_QUERY:
                pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
                del |= br_ip4_multicast_rport_del(pmctx);
                del |= br_ip6_multicast_rport_del(pmctx);
                br_multicast_rport_del_notify(pmctx, del);
                break;
        case MDB_RTR_TYPE_PERM:
                pmctx->multicast_router = MDB_RTR_TYPE_PERM;
                del_timer(&pmctx->ip4_mc_router_timer);
                br_ip4_multicast_add_router(brmctx, pmctx);
#if IS_ENABLED(CONFIG_IPV6)
                del_timer(&pmctx->ip6_mc_router_timer);
#endif
                br_ip6_multicast_add_router(brmctx, pmctx);
                break;
        case MDB_RTR_TYPE_TEMP:
                pmctx->multicast_router = MDB_RTR_TYPE_TEMP;
                br_ip4_multicast_mark_router(brmctx, pmctx);
                br_ip6_multicast_mark_router(brmctx, pmctx);
                break;
        default:
                goto unlock;
        }
        err = 0;
unlock:
        spin_unlock(&p->br->multicast_lock);

        return err;
}

static void br_multicast_start_querier(struct net_bridge_mcast *brmctx,
                                       struct bridge_mcast_own_query *query)
{
        struct net_bridge_port *port;

        __br_multicast_open_query(brmctx->br, query);

        rcu_read_lock();
        list_for_each_entry_rcu(port, &brmctx->br->port_list, list) {
                struct bridge_mcast_own_query *ip4_own_query;
#if IS_ENABLED(CONFIG_IPV6)
                struct bridge_mcast_own_query *ip6_own_query;
#endif

                if (br_multicast_port_ctx_state_stopped(&port->multicast_ctx))
                        continue;

                if (br_multicast_ctx_is_vlan(brmctx)) {
                        struct net_bridge_vlan *vlan;

                        vlan = br_vlan_find(nbp_vlan_group(port), brmctx->vlan->vid);
                        if (!vlan ||
                            br_multicast_port_ctx_state_stopped(&vlan->port_mcast_ctx))
                                continue;

                        ip4_own_query = &vlan->port_mcast_ctx.ip4_own_query;
#if IS_ENABLED(CONFIG_IPV6)
                        ip6_own_query = &vlan->port_mcast_ctx.ip6_own_query;
#endif
                } else {
                        ip4_own_query = &port->multicast_ctx.ip4_own_query;
#if IS_ENABLED(CONFIG_IPV6)
                        ip6_own_query = &port->multicast_ctx.ip6_own_query;
#endif
                }

                if (query == &brmctx->ip4_own_query)
                        br_multicast_enable(ip4_own_query);
#if IS_ENABLED(CONFIG_IPV6)
                else
                        br_multicast_enable(ip6_own_query);
#endif
        }
        rcu_read_unlock();
}

int br_multicast_toggle(struct net_bridge *br, unsigned long val,
                        struct netlink_ext_ack *extack)
{
        struct net_bridge_port *port;
        bool change_snoopers = false;
        int err = 0;

        spin_lock_bh(&br->multicast_lock);
        if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val)
                goto unlock;

        err = br_mc_disabled_update(br->dev, val, extack);
        if (err == -EOPNOTSUPP)
                err = 0;
        if (err)
                goto unlock;

        br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val);
        if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) {
                change_snoopers = true;
                goto unlock;
        }

        if (!netif_running(br->dev))
                goto unlock;

        br_multicast_open(br);
        list_for_each_entry(port, &br->port_list, list)
                __br_multicast_enable_port_ctx(&port->multicast_ctx);

        change_snoopers = true;

unlock:
        spin_unlock_bh(&br->multicast_lock);

        /* br_multicast_join_snoopers has the potential to cause
         * an MLD Report/Leave to be delivered to br_multicast_rcv,
         * which would in turn call br_multicast_add_group, which would
         * attempt to acquire multicast_lock. This function should be
         * called after the lock has been released to avoid deadlocks on
         * multicast_lock.
         *
         * br_multicast_leave_snoopers does not have the problem since
         * br_multicast_rcv first checks BROPT_MULTICAST_ENABLED, and
         * returns without calling br_multicast_ipv4/6_rcv if it's not
         * enabled. Moved both functions out just for symmetry.
         */
        if (change_snoopers) {
                if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
                        br_multicast_join_snoopers(br);
                else
                        br_multicast_leave_snoopers(br);
        }

        return err;
}

bool br_multicast_enabled(const struct net_device *dev)
{
        struct net_bridge *br = netdev_priv(dev);

        return !!br_opt_get(br, BROPT_MULTICAST_ENABLED);
}
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->multicast_ctx, NULL);
        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)
{
        struct net_bridge_mcast *brmctx = &br->multicast_ctx;
        unsigned long max_delay;

        val = !!val;

        spin_lock_bh(&br->multicast_lock);
        if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val)
                goto unlock;

        br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val);
        if (!val)
                goto unlock;

        max_delay = brmctx->multicast_query_response_interval;

        if (!timer_pending(&brmctx->ip4_other_query.timer))
                brmctx->ip4_other_query.delay_time = jiffies + max_delay;

        br_multicast_start_querier(brmctx, &brmctx->ip4_own_query);

#if IS_ENABLED(CONFIG_IPV6)
        if (!timer_pending(&brmctx->ip6_other_query.timer))
                brmctx->ip6_other_query.delay_time = jiffies + max_delay;

        br_multicast_start_querier(brmctx, &brmctx->ip6_own_query);
#endif

unlock:
        spin_unlock_bh(&br->multicast_lock);

        return 0;
}

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_ctx.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_ctx.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 || !netif_is_bridge_port(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->key.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 (!netif_is_bridge_port(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->multicast_ctx, &eth, NULL);

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_mcast *brmctx;
        struct net_bridge *br;
        struct net_bridge_port *port;
        bool ret = false;

        rcu_read_lock();
        if (!netif_is_bridge_port(dev))
                goto unlock;

        port = br_port_get_rcu(dev);
        if (!port || !port->br)
                goto unlock;

        br = port->br;
        brmctx = &br->multicast_ctx;

        switch (proto) {
        case ETH_P_IP:
                if (!timer_pending(&brmctx->ip4_other_query.timer) ||
                    rcu_dereference(brmctx->ip4_querier.port) == port)
                        goto unlock;
                break;
#if IS_ENABLED(CONFIG_IPV6)
        case ETH_P_IPV6:
                if (!timer_pending(&brmctx->ip6_other_query.timer) ||
                    rcu_dereference(brmctx->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);

/**
 * br_multicast_has_router_adjacent - Checks for a router behind a bridge port
 * @dev: The bridge port adjacent to which to check for a multicast router
 * @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 multicast router is behind one of the other ports of this
 * bridge. Otherwise returns false.
 */
bool br_multicast_has_router_adjacent(struct net_device *dev, int proto)
{
        struct net_bridge_mcast_port *pmctx;
        struct net_bridge_mcast *brmctx;
        struct net_bridge_port *port;
        bool ret = false;

        rcu_read_lock();
        port = br_port_get_check_rcu(dev);
        if (!port)
                goto unlock;

        brmctx = &port->br->multicast_ctx;
        switch (proto) {
        case ETH_P_IP:
                hlist_for_each_entry_rcu(pmctx, &brmctx->ip4_mc_router_list,
                                         ip4_rlist) {
                        if (pmctx->port == port)
                                continue;

                        ret = true;
                        goto unlock;
                }
                break;
#if IS_ENABLED(CONFIG_IPV6)
        case ETH_P_IPV6:
                hlist_for_each_entry_rcu(pmctx, &brmctx->ip6_mc_router_list,
                                         ip6_rlist) {
                        if (pmctx->port == port)
                                continue;

                        ret = true;
                        goto unlock;
                }
                break;
#endif
        default:
                /* when compiled without IPv6 support, be conservative and
                 * always assume presence of an IPv6 multicast router
                 */
                ret = true;
        }

unlock:
        rcu_read_unlock();
        return ret;
}
EXPORT_SYMBOL_GPL(br_multicast_has_router_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_opt_get(br, BROPT_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);
}

/* noinline for https://bugs.llvm.org/show_bug.cgi?id=45802#c9 */
static noinline_for_stack 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));
}

int br_mdb_hash_init(struct net_bridge *br)
{
        int err;

        err = rhashtable_init(&br->sg_port_tbl, &br_sg_port_rht_params);
        if (err)
                return err;

        err = rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params);
        if (err) {
                rhashtable_destroy(&br->sg_port_tbl);
                return err;
        }

        return 0;
}

void br_mdb_hash_fini(struct net_bridge *br)
{
        rhashtable_destroy(&br->sg_port_tbl);
        rhashtable_destroy(&br->mdb_hash_tbl);
}