br_multicast.c 49.3 KB
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/*
 * Bridge multicast support.
 *
 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */

#include <linux/err.h>
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#include <linux/export.h>
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#include <linux/if_ether.h>
#include <linux/igmp.h>
#include <linux/jhash.h>
#include <linux/kernel.h>
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#include <linux/log2.h>
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#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>
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#include <linux/inetdevice.h>
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#include <net/ip.h>
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#if IS_ENABLED(CONFIG_IPV6)
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#include <net/ipv6.h>
#include <net/mld.h>
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#include <net/ip6_checksum.h>
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#include <net/addrconf.h>
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#endif
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#include "br_private.h"

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static void br_multicast_start_querier(struct net_bridge *br,
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				       struct bridge_mcast_own_query *query);
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static void br_multicast_add_router(struct net_bridge *br,
				    struct net_bridge_port *port);
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static void br_ip4_multicast_leave_group(struct net_bridge *br,
					 struct net_bridge_port *port,
					 __be32 group,
					 __u16 vid);
#if IS_ENABLED(CONFIG_IPV6)
static void br_ip6_multicast_leave_group(struct net_bridge *br,
					 struct net_bridge_port *port,
					 const struct in6_addr *group,
					 __u16 vid);
#endif
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unsigned int br_mdb_rehash_seq;
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static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
{
	if (a->proto != b->proto)
		return 0;
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	if (a->vid != b->vid)
		return 0;
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	switch (a->proto) {
	case htons(ETH_P_IP):
		return a->u.ip4 == b->u.ip4;
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#if IS_ENABLED(CONFIG_IPV6)
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	case htons(ETH_P_IPV6):
		return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
#endif
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	}
	return 0;
}

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static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
				__u16 vid)
73
{
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	return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
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}

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#if IS_ENABLED(CONFIG_IPV6)
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static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
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				const struct in6_addr *ip,
				__u16 vid)
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{
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	return jhash_2words(ipv6_addr_hash(ip), vid,
			    mdb->secret) & (mdb->max - 1);
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}
#endif

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static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
			     struct br_ip *ip)
{
	switch (ip->proto) {
	case htons(ETH_P_IP):
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		return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
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#if IS_ENABLED(CONFIG_IPV6)
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	case htons(ETH_P_IPV6):
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		return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
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#endif
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	}
	return 0;
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}

static struct net_bridge_mdb_entry *__br_mdb_ip_get(
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	struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
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{
	struct net_bridge_mdb_entry *mp;

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	hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
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		if (br_ip_equal(&mp->addr, dst))
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			return mp;
	}

	return NULL;
}

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struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
					   struct br_ip *dst)
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{
	if (!mdb)
		return NULL;

	return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
}

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static struct net_bridge_mdb_entry *br_mdb_ip4_get(
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	struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
125
{
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	struct br_ip br_dst;

	br_dst.u.ip4 = dst;
	br_dst.proto = htons(ETH_P_IP);
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	br_dst.vid = vid;
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	return br_mdb_ip_get(mdb, &br_dst);
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}

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#if IS_ENABLED(CONFIG_IPV6)
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static struct net_bridge_mdb_entry *br_mdb_ip6_get(
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	struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
	__u16 vid)
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{
	struct br_ip br_dst;
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	br_dst.u.ip6 = *dst;
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	br_dst.proto = htons(ETH_P_IPV6);
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	br_dst.vid = vid;
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	return br_mdb_ip_get(mdb, &br_dst);
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}
#endif

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

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	if (br->multicast_disabled)
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		return NULL;

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

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	ip.proto = skb->protocol;
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	ip.vid = vid;
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	switch (skb->protocol) {
	case htons(ETH_P_IP):
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		ip.u.ip4 = ip_hdr(skb)->daddr;
		break;
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#if IS_ENABLED(CONFIG_IPV6)
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	case htons(ETH_P_IPV6):
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		ip.u.ip6 = ipv6_hdr(skb)->daddr;
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		break;
#endif
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	default:
		return NULL;
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	}

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	return br_mdb_ip_get(mdb, &ip);
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}

static void br_mdb_free(struct rcu_head *head)
{
	struct net_bridge_mdb_htable *mdb =
		container_of(head, struct net_bridge_mdb_htable, rcu);
	struct net_bridge_mdb_htable *old = mdb->old;

	mdb->old = NULL;
	kfree(old->mhash);
	kfree(old);
}

static int br_mdb_copy(struct net_bridge_mdb_htable *new,
		       struct net_bridge_mdb_htable *old,
		       int elasticity)
{
	struct net_bridge_mdb_entry *mp;
	int maxlen;
	int len;
	int i;

	for (i = 0; i < old->max; i++)
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		hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
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			hlist_add_head(&mp->hlist[new->ver],
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				       &new->mhash[br_ip_hash(new, &mp->addr)]);
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	if (!elasticity)
		return 0;

	maxlen = 0;
	for (i = 0; i < new->max; i++) {
		len = 0;
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		hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
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			len++;
		if (len > maxlen)
			maxlen = len;
	}

	return maxlen > elasticity ? -EINVAL : 0;
}

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void br_multicast_free_pg(struct rcu_head *head)
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{
	struct net_bridge_port_group *p =
		container_of(head, struct net_bridge_port_group, rcu);

	kfree(p);
}

static void br_multicast_free_group(struct rcu_head *head)
{
	struct net_bridge_mdb_entry *mp =
		container_of(head, struct net_bridge_mdb_entry, rcu);

	kfree(mp);
}

static void br_multicast_group_expired(unsigned long data)
{
	struct net_bridge_mdb_entry *mp = (void *)data;
	struct net_bridge *br = mp->br;
	struct net_bridge_mdb_htable *mdb;

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

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	mp->mglist = false;
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	if (mp->ports)
		goto out;

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	mdb = mlock_dereference(br->mdb, br);

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	hlist_del_rcu(&mp->hlist[mdb->ver]);
	mdb->size--;

	call_rcu_bh(&mp->rcu, br_multicast_free_group);

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

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

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

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

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		rcu_assign_pointer(*pp, p->next);
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		hlist_del_init(&p->mglist);
		del_timer(&p->timer);
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		br_mdb_notify(br->dev, p, RTM_DELMDB);
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		call_rcu_bh(&p->rcu, br_multicast_free_pg);

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

		return;
	}

	WARN_ON(1);
}

static void br_multicast_port_group_expired(unsigned long data)
{
	struct net_bridge_port_group *pg = (void *)data;
	struct net_bridge *br = pg->port->br;

	spin_lock(&br->multicast_lock);
	if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
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	    hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
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		goto out;

	br_multicast_del_pg(br, pg);

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

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static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
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			 int elasticity)
{
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	struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
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	struct net_bridge_mdb_htable *mdb;
	int err;

	mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
	if (!mdb)
		return -ENOMEM;

	mdb->max = max;
	mdb->old = old;

	mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
	if (!mdb->mhash) {
		kfree(mdb);
		return -ENOMEM;
	}

	mdb->size = old ? old->size : 0;
	mdb->ver = old ? old->ver ^ 1 : 0;

	if (!old || elasticity)
		get_random_bytes(&mdb->secret, sizeof(mdb->secret));
	else
		mdb->secret = old->secret;

	if (!old)
		goto out;

	err = br_mdb_copy(mdb, old, elasticity);
	if (err) {
		kfree(mdb->mhash);
		kfree(mdb);
		return err;
	}

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	br_mdb_rehash_seq++;
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	call_rcu_bh(&mdb->rcu, br_mdb_free);

out:
	rcu_assign_pointer(*mdbp, mdb);

	return 0;
}

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static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
						    __be32 group)
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{
	struct sk_buff *skb;
	struct igmphdr *ih;
	struct ethhdr *eth;
	struct iphdr *iph;

	skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
						 sizeof(*ih) + 4);
	if (!skb)
		goto out;

	skb->protocol = htons(ETH_P_IP);

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

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	ether_addr_copy(eth->h_source, br->dev->dev_addr);
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	eth->h_dest[0] = 1;
	eth->h_dest[1] = 0;
	eth->h_dest[2] = 0x5e;
	eth->h_dest[3] = 0;
	eth->h_dest[4] = 0;
	eth->h_dest[5] = 1;
	eth->h_proto = htons(ETH_P_IP);
	skb_put(skb, sizeof(*eth));

	skb_set_network_header(skb, skb->len);
	iph = ip_hdr(skb);

	iph->version = 4;
	iph->ihl = 6;
	iph->tos = 0xc0;
	iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
	iph->id = 0;
	iph->frag_off = htons(IP_DF);
	iph->ttl = 1;
	iph->protocol = IPPROTO_IGMP;
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	iph->saddr = br->multicast_query_use_ifaddr ?
		     inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
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	iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
	((u8 *)&iph[1])[0] = IPOPT_RA;
	((u8 *)&iph[1])[1] = 4;
	((u8 *)&iph[1])[2] = 0;
	((u8 *)&iph[1])[3] = 0;
	ip_send_check(iph);
	skb_put(skb, 24);

	skb_set_transport_header(skb, skb->len);
	ih = igmp_hdr(skb);
	ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
	ih->code = (group ? br->multicast_last_member_interval :
			    br->multicast_query_response_interval) /
		   (HZ / IGMP_TIMER_SCALE);
	ih->group = group;
	ih->csum = 0;
	ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
	skb_put(skb, sizeof(*ih));

	__skb_pull(skb, sizeof(*eth));

out:
	return skb;
}

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#if IS_ENABLED(CONFIG_IPV6)
429
static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
430
						    const struct in6_addr *group)
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{
	struct sk_buff *skb;
	struct ipv6hdr *ip6h;
	struct mld_msg *mldq;
	struct ethhdr *eth;
	u8 *hopopt;
	unsigned long interval;

	skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
						 8 + sizeof(*mldq));
	if (!skb)
		goto out;

	skb->protocol = htons(ETH_P_IPV6);

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

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	ether_addr_copy(eth->h_source, br->dev->dev_addr);
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	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);
459
	ip6h->payload_len = htons(8 + sizeof(*mldq));
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	ip6h->nexthdr = IPPROTO_HOPOPTS;
	ip6h->hop_limit = 1;
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	ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
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	if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
			       &ip6h->saddr)) {
		kfree_skb(skb);
		return NULL;
	}
468
	ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
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	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;
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	hopopt[6] = IPV6_TLV_PAD1;		/* Pad1 */
	hopopt[7] = IPV6_TLV_PAD1;		/* Pad1 */
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	skb_put(skb, sizeof(*ip6h) + 8);

	/* ICMPv6 */
	skb_set_transport_header(skb, skb->len);
	mldq = (struct mld_msg *) icmp6_hdr(skb);

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	interval = ipv6_addr_any(group) ?
			br->multicast_query_response_interval :
			br->multicast_last_member_interval;
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	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;
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	mldq->mld_mca = *group;
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	/* checksum */
	mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
					  sizeof(*mldq), IPPROTO_ICMPV6,
					  csum_partial(mldq,
						       sizeof(*mldq), 0));
	skb_put(skb, sizeof(*mldq));

	__skb_pull(skb, sizeof(*eth));

out:
	return skb;
}
#endif

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static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
						struct br_ip *addr)
{
	switch (addr->proto) {
	case htons(ETH_P_IP):
		return br_ip4_multicast_alloc_query(br, addr->u.ip4);
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#if IS_ENABLED(CONFIG_IPV6)
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	case htons(ETH_P_IPV6):
		return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
#endif
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	}
	return NULL;
}

525
static struct net_bridge_mdb_entry *br_multicast_get_group(
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	struct net_bridge *br, struct net_bridge_port *port,
	struct br_ip *group, int hash)
528
{
529
	struct net_bridge_mdb_htable *mdb;
530
	struct net_bridge_mdb_entry *mp;
531 532
	unsigned int count = 0;
	unsigned int max;
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	int elasticity;
	int err;

536
	mdb = rcu_dereference_protected(br->mdb, 1);
537
	hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
538
		count++;
539
		if (unlikely(br_ip_equal(group, &mp->addr)))
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			return mp;
	}

	elasticity = 0;
	max = mdb->max;

	if (unlikely(count > br->hash_elasticity && count)) {
		if (net_ratelimit())
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			br_info(br, "Multicast hash table "
				"chain limit reached: %s\n",
				port ? port->dev->name : br->dev->name);
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		elasticity = br->hash_elasticity;
	}

	if (mdb->size >= max) {
		max *= 2;
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		if (unlikely(max > br->hash_max)) {
			br_warn(br, "Multicast hash table maximum of %d "
				"reached, disabling snooping: %s\n",
				br->hash_max,
				port ? port->dev->name : br->dev->name);
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			err = -E2BIG;
disable:
			br->multicast_disabled = 1;
			goto err;
		}
	}

	if (max > mdb->max || elasticity) {
		if (mdb->old) {
			if (net_ratelimit())
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				br_info(br, "Multicast hash table "
					"on fire: %s\n",
					port ? port->dev->name : br->dev->name);
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			err = -EEXIST;
			goto err;
		}

		err = br_mdb_rehash(&br->mdb, max, elasticity);
		if (err) {
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			br_warn(br, "Cannot rehash multicast "
				"hash table, disabling snooping: %s, %d, %d\n",
				port ? port->dev->name : br->dev->name,
				mdb->size, err);
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			goto disable;
		}

		err = -EAGAIN;
		goto err;
	}

	return NULL;

err:
	mp = ERR_PTR(err);
	return mp;
}

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struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
	struct net_bridge_port *port, struct br_ip *group)
601
{
602
	struct net_bridge_mdb_htable *mdb;
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	struct net_bridge_mdb_entry *mp;
	int hash;
605
	int err;
606

607
	mdb = rcu_dereference_protected(br->mdb, 1);
608
	if (!mdb) {
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		err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
		if (err)
			return ERR_PTR(err);
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		goto rehash;
	}

	hash = br_ip_hash(mdb, group);
	mp = br_multicast_get_group(br, port, group, hash);
	switch (PTR_ERR(mp)) {
	case 0:
		break;

	case -EAGAIN:
rehash:
623
		mdb = rcu_dereference_protected(br->mdb, 1);
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		hash = br_ip_hash(mdb, group);
		break;

	default:
		goto out;
	}

	mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
	if (unlikely(!mp))
633
		return ERR_PTR(-ENOMEM);
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	mp->br = br;
636
	mp->addr = *group;
637 638 639
	setup_timer(&mp->timer, br_multicast_group_expired,
		    (unsigned long)mp);

640 641 642 643 644 645 646
	hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
	mdb->size++;

out:
	return mp;
}

647 648 649
struct net_bridge_port_group *br_multicast_new_port_group(
			struct net_bridge_port *port,
			struct br_ip *group,
650
			struct net_bridge_port_group __rcu *next,
651
			unsigned char flags)
652 653 654 655 656 657 658 659 660
{
	struct net_bridge_port_group *p;

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

	p->addr = *group;
	p->port = port;
661
	p->flags = flags;
662
	rcu_assign_pointer(p->next, next);
663 664 665 666 667 668
	hlist_add_head(&p->mglist, &port->mglist);
	setup_timer(&p->timer, br_multicast_port_group_expired,
		    (unsigned long)p);
	return p;
}

669
static int br_multicast_add_group(struct net_bridge *br,
670 671
				  struct net_bridge_port *port,
				  struct br_ip *group)
672 673 674
{
	struct net_bridge_mdb_entry *mp;
	struct net_bridge_port_group *p;
675
	struct net_bridge_port_group __rcu **pp;
676
	unsigned long now = jiffies;
677 678 679 680 681 682 683 684 685
	int err;

	spin_lock(&br->multicast_lock);
	if (!netif_running(br->dev) ||
	    (port && port->state == BR_STATE_DISABLED))
		goto out;

	mp = br_multicast_new_group(br, port, group);
	err = PTR_ERR(mp);
686
	if (IS_ERR(mp))
687 688 689
		goto err;

	if (!port) {
690
		mp->mglist = true;
691
		mod_timer(&mp->timer, now + br->multicast_membership_interval);
692 693 694
		goto out;
	}

695 696 697
	for (pp = &mp->ports;
	     (p = mlock_dereference(*pp, br)) != NULL;
	     pp = &p->next) {
698
		if (p->port == port)
699
			goto found;
700 701 702 703
		if ((unsigned long)p->port < (unsigned long)port)
			break;
	}

704
	p = br_multicast_new_port_group(port, group, *pp, 0);
705 706 707
	if (unlikely(!p))
		goto err;
	rcu_assign_pointer(*pp, p);
708
	br_mdb_notify(br->dev, p, RTM_NEWMDB);
709

710 711
found:
	mod_timer(&p->timer, now + br->multicast_membership_interval);
712 713 714 715 716 717 718 719
out:
	err = 0;

err:
	spin_unlock(&br->multicast_lock);
	return err;
}

720 721
static int br_ip4_multicast_add_group(struct net_bridge *br,
				      struct net_bridge_port *port,
722 723
				      __be32 group,
				      __u16 vid)
724 725 726 727 728 729 730 731
{
	struct br_ip br_group;

	if (ipv4_is_local_multicast(group))
		return 0;

	br_group.u.ip4 = group;
	br_group.proto = htons(ETH_P_IP);
732
	br_group.vid = vid;
733 734 735 736

	return br_multicast_add_group(br, port, &br_group);
}

E
Eric Dumazet 已提交
737
#if IS_ENABLED(CONFIG_IPV6)
738 739
static int br_ip6_multicast_add_group(struct net_bridge *br,
				      struct net_bridge_port *port,
740 741
				      const struct in6_addr *group,
				      __u16 vid)
742 743 744
{
	struct br_ip br_group;

745
	if (ipv6_addr_is_ll_all_nodes(group))
746 747
		return 0;

A
Alexey Dobriyan 已提交
748
	br_group.u.ip6 = *group;
749
	br_group.proto = htons(ETH_P_IPV6);
750
	br_group.vid = vid;
751 752 753 754 755

	return br_multicast_add_group(br, port, &br_group);
}
#endif

756 757 758 759 760 761
static void br_multicast_router_expired(unsigned long data)
{
	struct net_bridge_port *port = (void *)data;
	struct net_bridge *br = port->br;

	spin_lock(&br->multicast_lock);
762
	if (port->multicast_router != MDB_RTR_TYPE_TEMP_QUERY ||
763 764 765 766 767
	    timer_pending(&port->multicast_router_timer) ||
	    hlist_unhashed(&port->rlist))
		goto out;

	hlist_del_init_rcu(&port->rlist);
768
	br_rtr_notify(br->dev, port, RTM_DELMDB);
769 770 771 772 773 774 775 776 777

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

static void br_multicast_local_router_expired(unsigned long data)
{
}

778
static void br_multicast_querier_expired(struct net_bridge *br,
779
					 struct bridge_mcast_own_query *query)
780 781 782 783 784
{
	spin_lock(&br->multicast_lock);
	if (!netif_running(br->dev) || br->multicast_disabled)
		goto out;

785
	br_multicast_start_querier(br, query);
786 787 788 789 790

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

791 792 793 794
static void br_ip4_multicast_querier_expired(unsigned long data)
{
	struct net_bridge *br = (void *)data;

795
	br_multicast_querier_expired(br, &br->ip4_own_query);
796 797 798 799 800 801 802
}

#if IS_ENABLED(CONFIG_IPV6)
static void br_ip6_multicast_querier_expired(unsigned long data)
{
	struct net_bridge *br = (void *)data;

803
	br_multicast_querier_expired(br, &br->ip6_own_query);
804 805 806
}
#endif

807 808 809 810 811 812 813 814 815 816 817 818
static void br_multicast_select_own_querier(struct net_bridge *br,
					    struct br_ip *ip,
					    struct sk_buff *skb)
{
	if (ip->proto == htons(ETH_P_IP))
		br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
#if IS_ENABLED(CONFIG_IPV6)
	else
		br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
#endif
}

819 820 821
static void __br_multicast_send_query(struct net_bridge *br,
				      struct net_bridge_port *port,
				      struct br_ip *ip)
822 823 824
{
	struct sk_buff *skb;

825
	skb = br_multicast_alloc_query(br, ip);
826
	if (!skb)
827
		return;
828 829 830

	if (port) {
		skb->dev = port->dev;
831 832
		NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
			dev_net(port->dev), NULL, skb, NULL, skb->dev,
833
			br_dev_queue_push_xmit);
834 835
	} else {
		br_multicast_select_own_querier(br, ip, skb);
836
		netif_rx(skb);
837
	}
838 839 840
}

static void br_multicast_send_query(struct net_bridge *br,
841
				    struct net_bridge_port *port,
842
				    struct bridge_mcast_own_query *own_query)
843 844 845
{
	unsigned long time;
	struct br_ip br_group;
846
	struct bridge_mcast_other_query *other_query = NULL;
847 848

	if (!netif_running(br->dev) || br->multicast_disabled ||
849
	    !br->multicast_querier)
850 851
		return;

852 853
	memset(&br_group.u, 0, sizeof(br_group.u));

854 855 856
	if (port ? (own_query == &port->ip4_own_query) :
		   (own_query == &br->ip4_own_query)) {
		other_query = &br->ip4_other_query;
857
		br_group.proto = htons(ETH_P_IP);
E
Eric Dumazet 已提交
858
#if IS_ENABLED(CONFIG_IPV6)
859
	} else {
860
		other_query = &br->ip6_other_query;
861
		br_group.proto = htons(ETH_P_IPV6);
862
#endif
863 864
	}

865
	if (!other_query || timer_pending(&other_query->timer))
866 867 868
		return;

	__br_multicast_send_query(br, port, &br_group);
869 870

	time = jiffies;
871
	time += own_query->startup_sent < br->multicast_startup_query_count ?
872 873
		br->multicast_startup_query_interval :
		br->multicast_query_interval;
874
	mod_timer(&own_query->timer, time);
875 876
}

877 878 879
static void
br_multicast_port_query_expired(struct net_bridge_port *port,
				struct bridge_mcast_own_query *query)
880 881 882 883
{
	struct net_bridge *br = port->br;

	spin_lock(&br->multicast_lock);
884 885
	if (port->state == BR_STATE_DISABLED ||
	    port->state == BR_STATE_BLOCKING)
886 887
		goto out;

888 889
	if (query->startup_sent < br->multicast_startup_query_count)
		query->startup_sent++;
890

891
	br_multicast_send_query(port->br, port, query);
892 893 894 895 896

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

897 898 899 900
static void br_ip4_multicast_port_query_expired(unsigned long data)
{
	struct net_bridge_port *port = (void *)data;

901
	br_multicast_port_query_expired(port, &port->ip4_own_query);
902 903 904 905 906 907 908
}

#if IS_ENABLED(CONFIG_IPV6)
static void br_ip6_multicast_port_query_expired(unsigned long data)
{
	struct net_bridge_port *port = (void *)data;

909
	br_multicast_port_query_expired(port, &port->ip6_own_query);
910 911 912
}
#endif

913 914
void br_multicast_add_port(struct net_bridge_port *port)
{
915
	port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
916 917 918

	setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
		    (unsigned long)port);
919 920
	setup_timer(&port->ip4_own_query.timer,
		    br_ip4_multicast_port_query_expired, (unsigned long)port);
921
#if IS_ENABLED(CONFIG_IPV6)
922 923
	setup_timer(&port->ip6_own_query.timer,
		    br_ip6_multicast_port_query_expired, (unsigned long)port);
924
#endif
925 926 927 928
}

void br_multicast_del_port(struct net_bridge_port *port)
{
929 930 931 932 933 934 935 936 937
	struct net_bridge *br = port->br;
	struct net_bridge_port_group *pg;
	struct hlist_node *n;

	/* Take care of the remaining groups, only perm ones should be left */
	spin_lock_bh(&br->multicast_lock);
	hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
		br_multicast_del_pg(br, pg);
	spin_unlock_bh(&br->multicast_lock);
938 939 940
	del_timer_sync(&port->multicast_router_timer);
}

941
static void br_multicast_enable(struct bridge_mcast_own_query *query)
942
{
943
	query->startup_sent = 0;
944

945 946 947
	if (try_to_del_timer_sync(&query->timer) >= 0 ||
	    del_timer(&query->timer))
		mod_timer(&query->timer, jiffies);
948 949
}

950 951 952 953 954 955 956 957
void br_multicast_enable_port(struct net_bridge_port *port)
{
	struct net_bridge *br = port->br;

	spin_lock(&br->multicast_lock);
	if (br->multicast_disabled || !netif_running(br->dev))
		goto out;

958
	br_multicast_enable(&port->ip4_own_query);
959
#if IS_ENABLED(CONFIG_IPV6)
960
	br_multicast_enable(&port->ip6_own_query);
961
#endif
962 963
	if (port->multicast_router == MDB_RTR_TYPE_PERM &&
	    hlist_unhashed(&port->rlist))
964
		br_multicast_add_router(br, port);
965 966 967 968 969 970 971 972 973

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

void br_multicast_disable_port(struct net_bridge_port *port)
{
	struct net_bridge *br = port->br;
	struct net_bridge_port_group *pg;
974
	struct hlist_node *n;
975 976

	spin_lock(&br->multicast_lock);
977
	hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
978
		if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
979
			br_multicast_del_pg(br, pg);
980

981
	if (!hlist_unhashed(&port->rlist)) {
982
		hlist_del_init_rcu(&port->rlist);
983 984
		br_rtr_notify(br->dev, port, RTM_DELMDB);
	}
985
	del_timer(&port->multicast_router_timer);
986
	del_timer(&port->ip4_own_query.timer);
987
#if IS_ENABLED(CONFIG_IPV6)
988
	del_timer(&port->ip6_own_query.timer);
989
#endif
990 991 992
	spin_unlock(&br->multicast_lock);
}

993 994
static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
					 struct net_bridge_port *port,
995 996
					 struct sk_buff *skb,
					 u16 vid)
997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008
{
	struct igmpv3_report *ih;
	struct igmpv3_grec *grec;
	int i;
	int len;
	int num;
	int type;
	int err = 0;
	__be32 group;

	ih = igmpv3_report_hdr(skb);
	num = ntohs(ih->ngrec);
1009
	len = skb_transport_offset(skb) + sizeof(*ih);
1010 1011 1012 1013 1014 1015

	for (i = 0; i < num; i++) {
		len += sizeof(*grec);
		if (!pskb_may_pull(skb, len))
			return -EINVAL;

H
Herbert Xu 已提交
1016
		grec = (void *)(skb->data + len - sizeof(*grec));
1017 1018 1019
		group = grec->grec_mca;
		type = grec->grec_type;

E
Eric Dumazet 已提交
1020
		len += ntohs(grec->grec_nsrcs) * 4;
1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037
		if (!pskb_may_pull(skb, len))
			return -EINVAL;

		/* We treat this as an IGMPv2 report for now. */
		switch (type) {
		case IGMPV3_MODE_IS_INCLUDE:
		case IGMPV3_MODE_IS_EXCLUDE:
		case IGMPV3_CHANGE_TO_INCLUDE:
		case IGMPV3_CHANGE_TO_EXCLUDE:
		case IGMPV3_ALLOW_NEW_SOURCES:
		case IGMPV3_BLOCK_OLD_SOURCES:
			break;

		default:
			continue;
		}

1038 1039 1040 1041 1042 1043 1044 1045 1046
		if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
		     type == IGMPV3_MODE_IS_INCLUDE) &&
		    ntohs(grec->grec_nsrcs) == 0) {
			br_ip4_multicast_leave_group(br, port, group, vid);
		} else {
			err = br_ip4_multicast_add_group(br, port, group, vid);
			if (err)
				break;
		}
1047 1048 1049 1050 1051
	}

	return err;
}

E
Eric Dumazet 已提交
1052
#if IS_ENABLED(CONFIG_IPV6)
1053 1054
static int br_ip6_multicast_mld2_report(struct net_bridge *br,
					struct net_bridge_port *port,
1055 1056
					struct sk_buff *skb,
					u16 vid)
1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069
{
	struct icmp6hdr *icmp6h;
	struct mld2_grec *grec;
	int i;
	int len;
	int num;
	int err = 0;

	if (!pskb_may_pull(skb, sizeof(*icmp6h)))
		return -EINVAL;

	icmp6h = icmp6_hdr(skb);
	num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1070
	len = skb_transport_offset(skb) + sizeof(*icmp6h);
1071 1072 1073 1074 1075 1076

	for (i = 0; i < num; i++) {
		__be16 *nsrcs, _nsrcs;

		nsrcs = skb_header_pointer(skb,
					   len + offsetof(struct mld2_grec,
1077
							  grec_nsrcs),
1078 1079 1080 1081 1082 1083
					   sizeof(_nsrcs), &_nsrcs);
		if (!nsrcs)
			return -EINVAL;

		if (!pskb_may_pull(skb,
				   len + sizeof(*grec) +
1084
				   sizeof(struct in6_addr) * ntohs(*nsrcs)))
1085 1086 1087
			return -EINVAL;

		grec = (struct mld2_grec *)(skb->data + len);
1088 1089
		len += sizeof(*grec) +
		       sizeof(struct in6_addr) * ntohs(*nsrcs);
1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104

		/* We treat these as MLDv1 reports for now. */
		switch (grec->grec_type) {
		case MLD2_MODE_IS_INCLUDE:
		case MLD2_MODE_IS_EXCLUDE:
		case MLD2_CHANGE_TO_INCLUDE:
		case MLD2_CHANGE_TO_EXCLUDE:
		case MLD2_ALLOW_NEW_SOURCES:
		case MLD2_BLOCK_OLD_SOURCES:
			break;

		default:
			continue;
		}

1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115
		if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
		     grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
		    ntohs(*nsrcs) == 0) {
			br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
						     vid);
		} else {
			err = br_ip6_multicast_add_group(br, port,
							 &grec->grec_mca, vid);
			if (!err)
				break;
		}
1116 1117 1118 1119 1120 1121
	}

	return err;
}
#endif

1122
static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1123
					    struct net_bridge_port *port,
1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140
					    __be32 saddr)
{
	if (!timer_pending(&br->ip4_own_query.timer) &&
	    !timer_pending(&br->ip4_other_query.timer))
		goto update;

	if (!br->ip4_querier.addr.u.ip4)
		goto update;

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

	return false;

update:
	br->ip4_querier.addr.u.ip4 = saddr;

1141 1142 1143
	/* update protected by general multicast_lock by caller */
	rcu_assign_pointer(br->ip4_querier.port, port);

1144 1145 1146 1147 1148
	return true;
}

#if IS_ENABLED(CONFIG_IPV6)
static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1149
					    struct net_bridge_port *port,
1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163
					    struct in6_addr *saddr)
{
	if (!timer_pending(&br->ip6_own_query.timer) &&
	    !timer_pending(&br->ip6_other_query.timer))
		goto update;

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

	return false;

update:
	br->ip6_querier.addr.u.ip6 = *saddr;

1164 1165 1166
	/* update protected by general multicast_lock by caller */
	rcu_assign_pointer(br->ip6_querier.port, port);

1167 1168 1169 1170 1171
	return true;
}
#endif

static bool br_multicast_select_querier(struct net_bridge *br,
1172
					struct net_bridge_port *port,
1173 1174 1175 1176
					struct br_ip *saddr)
{
	switch (saddr->proto) {
	case htons(ETH_P_IP):
1177
		return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1178 1179
#if IS_ENABLED(CONFIG_IPV6)
	case htons(ETH_P_IPV6):
1180
		return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1181 1182 1183 1184 1185 1186
#endif
	}

	return false;
}

1187
static void
1188 1189 1190
br_multicast_update_query_timer(struct net_bridge *br,
				struct bridge_mcast_other_query *query,
				unsigned long max_delay)
1191
{
1192 1193
	if (!timer_pending(&query->timer))
		query->delay_time = jiffies + max_delay;
1194

1195
	mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1196 1197
}

1198
/*
C
Cong Wang 已提交
1199
 * Add port to router_list
1200 1201 1202
 *  list is maintained ordered by pointer value
 *  and locked by br->multicast_lock and RCU
 */
1203 1204 1205
static void br_multicast_add_router(struct net_bridge *br,
				    struct net_bridge_port *port)
{
1206
	struct net_bridge_port *p;
1207
	struct hlist_node *slot = NULL;
1208

1209 1210 1211
	if (!hlist_unhashed(&port->rlist))
		return;

1212
	hlist_for_each_entry(p, &br->router_list, rlist) {
1213 1214
		if ((unsigned long) port >= (unsigned long) p)
			break;
1215
		slot = &p->rlist;
1216 1217
	}

1218
	if (slot)
1219
		hlist_add_behind_rcu(&port->rlist, slot);
1220 1221
	else
		hlist_add_head_rcu(&port->rlist, &br->router_list);
1222
	br_rtr_notify(br->dev, port, RTM_NEWMDB);
1223 1224
}

1225 1226 1227 1228 1229 1230
static void br_multicast_mark_router(struct net_bridge *br,
				     struct net_bridge_port *port)
{
	unsigned long now = jiffies;

	if (!port) {
1231
		if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY)
1232 1233 1234 1235 1236
			mod_timer(&br->multicast_router_timer,
				  now + br->multicast_querier_interval);
		return;
	}

1237
	if (port->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
1238 1239
		return;

1240
	br_multicast_add_router(br, port);
1241 1242 1243 1244 1245 1246 1247

	mod_timer(&port->multicast_router_timer,
		  now + br->multicast_querier_interval);
}

static void br_multicast_query_received(struct net_bridge *br,
					struct net_bridge_port *port,
1248
					struct bridge_mcast_other_query *query,
1249
					struct br_ip *saddr,
1250
					unsigned long max_delay)
1251
{
1252
	if (!br_multicast_select_querier(br, port, saddr))
1253 1254
		return;

1255
	br_multicast_update_query_timer(br, query, max_delay);
1256 1257 1258
	br_multicast_mark_router(br, port);
}

1259 1260
static int br_ip4_multicast_query(struct net_bridge *br,
				  struct net_bridge_port *port,
1261 1262
				  struct sk_buff *skb,
				  u16 vid)
1263
{
1264
	const struct iphdr *iph = ip_hdr(skb);
1265 1266 1267 1268
	struct igmphdr *ih = igmp_hdr(skb);
	struct net_bridge_mdb_entry *mp;
	struct igmpv3_query *ih3;
	struct net_bridge_port_group *p;
1269
	struct net_bridge_port_group __rcu **pp;
1270
	struct br_ip saddr;
1271 1272 1273
	unsigned long max_delay;
	unsigned long now = jiffies;
	__be32 group;
1274
	int err = 0;
1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289

	spin_lock(&br->multicast_lock);
	if (!netif_running(br->dev) ||
	    (port && port->state == BR_STATE_DISABLED))
		goto out;

	group = ih->group;

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

		if (!max_delay) {
			max_delay = 10 * HZ;
			group = 0;
		}
1290
	} else if (skb->len >= sizeof(*ih3)) {
1291 1292
		ih3 = igmpv3_query_hdr(skb);
		if (ih3->nsrcs)
1293
			goto out;
1294

1295 1296
		max_delay = ih3->code ?
			    IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1297
	} else {
1298 1299 1300
		goto out;
	}

1301 1302 1303
	if (!group) {
		saddr.proto = htons(ETH_P_IP);
		saddr.u.ip4 = iph->saddr;
1304

1305 1306
		br_multicast_query_received(br, port, &br->ip4_other_query,
					    &saddr, max_delay);
1307
		goto out;
1308
	}
1309

1310
	mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1311 1312 1313 1314 1315
	if (!mp)
		goto out;

	max_delay *= br->multicast_last_member_count;

1316
	if (mp->mglist &&
1317 1318 1319 1320 1321
	    (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);

1322 1323 1324
	for (pp = &mp->ports;
	     (p = mlock_dereference(*pp, br)) != NULL;
	     pp = &p->next) {
1325 1326 1327
		if (timer_pending(&p->timer) ?
		    time_after(p->timer.expires, now + max_delay) :
		    try_to_del_timer_sync(&p->timer) >= 0)
1328
			mod_timer(&p->timer, now + max_delay);
1329 1330 1331 1332
	}

out:
	spin_unlock(&br->multicast_lock);
1333
	return err;
1334 1335
}

E
Eric Dumazet 已提交
1336
#if IS_ENABLED(CONFIG_IPV6)
1337 1338
static int br_ip6_multicast_query(struct net_bridge *br,
				  struct net_bridge_port *port,
1339 1340
				  struct sk_buff *skb,
				  u16 vid)
1341
{
1342
	const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1343
	struct mld_msg *mld;
1344 1345
	struct net_bridge_mdb_entry *mp;
	struct mld2_query *mld2q;
1346 1347
	struct net_bridge_port_group *p;
	struct net_bridge_port_group __rcu **pp;
1348
	struct br_ip saddr;
1349 1350
	unsigned long max_delay;
	unsigned long now = jiffies;
1351
	const struct in6_addr *group = NULL;
1352
	bool is_general_query;
1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365
	int err = 0;

	spin_lock(&br->multicast_lock);
	if (!netif_running(br->dev) ||
	    (port && port->state == BR_STATE_DISABLED))
		goto out;

	if (skb->len == sizeof(*mld)) {
		if (!pskb_may_pull(skb, sizeof(*mld))) {
			err = -EINVAL;
			goto out;
		}
		mld = (struct mld_msg *) icmp6_hdr(skb);
L
Li RongQing 已提交
1366
		max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1367 1368
		if (max_delay)
			group = &mld->mld_mca;
1369
	} else {
1370 1371 1372 1373 1374 1375 1376
		if (!pskb_may_pull(skb, sizeof(*mld2q))) {
			err = -EINVAL;
			goto out;
		}
		mld2q = (struct mld2_query *)icmp6_hdr(skb);
		if (!mld2q->mld2q_nsrcs)
			group = &mld2q->mld2q_mca;
1377 1378

		max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1379 1380
	}

1381 1382
	is_general_query = group && ipv6_addr_any(group);

1383 1384 1385
	if (is_general_query) {
		saddr.proto = htons(ETH_P_IPV6);
		saddr.u.ip6 = ip6h->saddr;
1386

1387 1388
		br_multicast_query_received(br, port, &br->ip6_other_query,
					    &saddr, max_delay);
1389
		goto out;
1390 1391
	} else if (!group) {
		goto out;
1392
	}
1393

1394
	mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1395 1396 1397 1398
	if (!mp)
		goto out;

	max_delay *= br->multicast_last_member_count;
1399
	if (mp->mglist &&
1400 1401 1402 1403 1404
	    (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);

1405 1406 1407
	for (pp = &mp->ports;
	     (p = mlock_dereference(*pp, br)) != NULL;
	     pp = &p->next) {
1408 1409 1410
		if (timer_pending(&p->timer) ?
		    time_after(p->timer.expires, now + max_delay) :
		    try_to_del_timer_sync(&p->timer) >= 0)
1411
			mod_timer(&p->timer, now + max_delay);
1412 1413 1414 1415 1416 1417 1418 1419
	}

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

1420 1421 1422 1423 1424 1425
static void
br_multicast_leave_group(struct net_bridge *br,
			 struct net_bridge_port *port,
			 struct br_ip *group,
			 struct bridge_mcast_other_query *other_query,
			 struct bridge_mcast_own_query *own_query)
1426 1427 1428 1429 1430 1431 1432 1433 1434
{
	struct net_bridge_mdb_htable *mdb;
	struct net_bridge_mdb_entry *mp;
	struct net_bridge_port_group *p;
	unsigned long now;
	unsigned long time;

	spin_lock(&br->multicast_lock);
	if (!netif_running(br->dev) ||
1435
	    (port && port->state == BR_STATE_DISABLED))
1436 1437
		goto out;

1438
	mdb = mlock_dereference(br->mdb, br);
1439 1440 1441 1442
	mp = br_mdb_ip_get(mdb, group);
	if (!mp)
		goto out;

1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455
	if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
		struct net_bridge_port_group __rcu **pp;

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

			rcu_assign_pointer(*pp, p->next);
			hlist_del_init(&p->mglist);
			del_timer(&p->timer);
			call_rcu_bh(&p->rcu, br_multicast_free_pg);
1456
			br_mdb_notify(br->dev, p, RTM_DELMDB);
1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467

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

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

1468
	if (br->multicast_querier) {
1469 1470 1471 1472
		__br_multicast_send_query(br, port, &mp->addr);

		time = jiffies + br->multicast_last_member_count *
				 br->multicast_last_member_interval;
1473

1474
		mod_timer(&own_query->timer, time);
1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492

		for (p = mlock_dereference(mp->ports, br);
		     p != NULL;
		     p = mlock_dereference(p->next, br)) {
			if (p->port != port)
				continue;

			if (!hlist_unhashed(&p->mglist) &&
			    (timer_pending(&p->timer) ?
			     time_after(p->timer.expires, time) :
			     try_to_del_timer_sync(&p->timer) >= 0)) {
				mod_timer(&p->timer, time);
			}

			break;
		}
	}

1493 1494 1495 1496 1497
	now = jiffies;
	time = now + br->multicast_last_member_count *
		     br->multicast_last_member_interval;

	if (!port) {
1498
		if (mp->mglist &&
1499 1500 1501 1502 1503
		    (timer_pending(&mp->timer) ?
		     time_after(mp->timer.expires, time) :
		     try_to_del_timer_sync(&mp->timer) >= 0)) {
			mod_timer(&mp->timer, time);
		}
1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521

		goto out;
	}

	for (p = mlock_dereference(mp->ports, br);
	     p != NULL;
	     p = mlock_dereference(p->next, br)) {
		if (p->port != port)
			continue;

		if (!hlist_unhashed(&p->mglist) &&
		    (timer_pending(&p->timer) ?
		     time_after(p->timer.expires, time) :
		     try_to_del_timer_sync(&p->timer) >= 0)) {
			mod_timer(&p->timer, time);
		}

		break;
1522 1523 1524 1525 1526
	}
out:
	spin_unlock(&br->multicast_lock);
}

1527 1528
static void br_ip4_multicast_leave_group(struct net_bridge *br,
					 struct net_bridge_port *port,
1529 1530
					 __be32 group,
					 __u16 vid)
1531 1532
{
	struct br_ip br_group;
1533
	struct bridge_mcast_own_query *own_query;
1534 1535 1536 1537

	if (ipv4_is_local_multicast(group))
		return;

1538 1539
	own_query = port ? &port->ip4_own_query : &br->ip4_own_query;

1540 1541
	br_group.u.ip4 = group;
	br_group.proto = htons(ETH_P_IP);
1542
	br_group.vid = vid;
1543

1544 1545
	br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
				 own_query);
1546 1547
}

E
Eric Dumazet 已提交
1548
#if IS_ENABLED(CONFIG_IPV6)
1549 1550
static void br_ip6_multicast_leave_group(struct net_bridge *br,
					 struct net_bridge_port *port,
1551 1552
					 const struct in6_addr *group,
					 __u16 vid)
1553 1554
{
	struct br_ip br_group;
1555
	struct bridge_mcast_own_query *own_query;
1556

1557
	if (ipv6_addr_is_ll_all_nodes(group))
1558 1559
		return;

1560 1561
	own_query = port ? &port->ip6_own_query : &br->ip6_own_query;

A
Alexey Dobriyan 已提交
1562
	br_group.u.ip6 = *group;
1563
	br_group.proto = htons(ETH_P_IPV6);
1564
	br_group.vid = vid;
1565

1566 1567
	br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
				 own_query);
1568 1569
}
#endif
1570

1571 1572
static int br_multicast_ipv4_rcv(struct net_bridge *br,
				 struct net_bridge_port *port,
1573 1574
				 struct sk_buff *skb,
				 u16 vid)
1575
{
1576
	struct sk_buff *skb_trimmed = NULL;
1577 1578 1579
	struct igmphdr *ih;
	int err;

1580
	err = ip_mc_check_igmp(skb, &skb_trimmed);
1581

1582 1583
	if (err == -ENOMSG) {
		if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
1584
			BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1585
		return 0;
1586 1587
	} else if (err < 0) {
		return err;
1588
	}
1589 1590

	BR_INPUT_SKB_CB(skb)->igmp = 1;
1591
	ih = igmp_hdr(skb);
1592 1593 1594 1595

	switch (ih->type) {
	case IGMP_HOST_MEMBERSHIP_REPORT:
	case IGMPV2_HOST_MEMBERSHIP_REPORT:
1596
		BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1597
		err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1598 1599
		break;
	case IGMPV3_HOST_MEMBERSHIP_REPORT:
1600
		err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1601 1602
		break;
	case IGMP_HOST_MEMBERSHIP_QUERY:
1603
		err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1604 1605
		break;
	case IGMP_HOST_LEAVE_MESSAGE:
1606
		br_ip4_multicast_leave_group(br, port, ih->group, vid);
1607 1608 1609
		break;
	}

1610
	if (skb_trimmed && skb_trimmed != skb)
1611 1612
		kfree_skb(skb_trimmed);

1613 1614 1615
	return err;
}

E
Eric Dumazet 已提交
1616
#if IS_ENABLED(CONFIG_IPV6)
1617 1618
static int br_multicast_ipv6_rcv(struct net_bridge *br,
				 struct net_bridge_port *port,
1619 1620
				 struct sk_buff *skb,
				 u16 vid)
1621
{
1622 1623
	struct sk_buff *skb_trimmed = NULL;
	struct mld_msg *mld;
1624 1625
	int err;

1626
	err = ipv6_mc_check_mld(skb, &skb_trimmed);
1627

1628 1629 1630
	if (err == -ENOMSG) {
		if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
			BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1631
		return 0;
1632 1633
	} else if (err < 0) {
		return err;
1634 1635 1636
	}

	BR_INPUT_SKB_CB(skb)->igmp = 1;
1637
	mld = (struct mld_msg *)skb_transport_header(skb);
1638

1639
	switch (mld->mld_type) {
1640
	case ICMPV6_MGM_REPORT:
1641
		BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1642
		err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1643 1644
		break;
	case ICMPV6_MLD2_REPORT:
1645
		err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1646 1647
		break;
	case ICMPV6_MGM_QUERY:
1648
		err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1649 1650
		break;
	case ICMPV6_MGM_REDUCTION:
1651
		br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1652
		break;
1653 1654
	}

1655
	if (skb_trimmed && skb_trimmed != skb)
1656 1657
		kfree_skb(skb_trimmed);

1658 1659 1660 1661
	return err;
}
#endif

1662
int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1663
		     struct sk_buff *skb, u16 vid)
1664
{
1665 1666 1667
	BR_INPUT_SKB_CB(skb)->igmp = 0;
	BR_INPUT_SKB_CB(skb)->mrouters_only = 0;

1668 1669 1670 1671 1672
	if (br->multicast_disabled)
		return 0;

	switch (skb->protocol) {
	case htons(ETH_P_IP):
1673
		return br_multicast_ipv4_rcv(br, port, skb, vid);
E
Eric Dumazet 已提交
1674
#if IS_ENABLED(CONFIG_IPV6)
1675
	case htons(ETH_P_IPV6):
1676
		return br_multicast_ipv6_rcv(br, port, skb, vid);
1677
#endif
1678 1679 1680 1681 1682
	}

	return 0;
}

1683
static void br_multicast_query_expired(struct net_bridge *br,
1684 1685
				       struct bridge_mcast_own_query *query,
				       struct bridge_mcast_querier *querier)
1686 1687 1688 1689 1690
{
	spin_lock(&br->multicast_lock);
	if (query->startup_sent < br->multicast_startup_query_count)
		query->startup_sent++;

1691
	RCU_INIT_POINTER(querier->port, NULL);
1692 1693 1694 1695 1696
	br_multicast_send_query(br, NULL, query);
	spin_unlock(&br->multicast_lock);
}

static void br_ip4_multicast_query_expired(unsigned long data)
1697 1698 1699
{
	struct net_bridge *br = (void *)data;

1700
	br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1701
}
1702

1703 1704 1705 1706
#if IS_ENABLED(CONFIG_IPV6)
static void br_ip6_multicast_query_expired(unsigned long data)
{
	struct net_bridge *br = (void *)data;
1707

1708
	br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1709
}
1710
#endif
1711 1712 1713 1714 1715 1716

void br_multicast_init(struct net_bridge *br)
{
	br->hash_elasticity = 4;
	br->hash_max = 512;

1717
	br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1718
	br->multicast_querier = 0;
1719
	br->multicast_query_use_ifaddr = 0;
1720 1721 1722 1723 1724 1725 1726 1727 1728 1729
	br->multicast_last_member_count = 2;
	br->multicast_startup_query_count = 2;

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

1730
	br->ip4_other_query.delay_time = 0;
1731
	br->ip4_querier.port = NULL;
1732
#if IS_ENABLED(CONFIG_IPV6)
1733
	br->ip6_other_query.delay_time = 0;
1734
	br->ip6_querier.port = NULL;
1735
#endif
1736

1737 1738 1739
	spin_lock_init(&br->multicast_lock);
	setup_timer(&br->multicast_router_timer,
		    br_multicast_local_router_expired, 0);
1740 1741 1742
	setup_timer(&br->ip4_other_query.timer,
		    br_ip4_multicast_querier_expired, (unsigned long)br);
	setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1743
		    (unsigned long)br);
1744
#if IS_ENABLED(CONFIG_IPV6)
1745 1746 1747
	setup_timer(&br->ip6_other_query.timer,
		    br_ip6_multicast_querier_expired, (unsigned long)br);
	setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1748 1749
		    (unsigned long)br);
#endif
1750 1751
}

1752
static void __br_multicast_open(struct net_bridge *br,
1753
				struct bridge_mcast_own_query *query)
1754
{
1755
	query->startup_sent = 0;
1756 1757 1758 1759

	if (br->multicast_disabled)
		return;

1760 1761 1762 1763 1764
	mod_timer(&query->timer, jiffies);
}

void br_multicast_open(struct net_bridge *br)
{
1765
	__br_multicast_open(br, &br->ip4_own_query);
1766
#if IS_ENABLED(CONFIG_IPV6)
1767
	__br_multicast_open(br, &br->ip6_own_query);
1768
#endif
1769 1770 1771 1772 1773
}

void br_multicast_stop(struct net_bridge *br)
{
	del_timer_sync(&br->multicast_router_timer);
1774 1775
	del_timer_sync(&br->ip4_other_query.timer);
	del_timer_sync(&br->ip4_own_query.timer);
1776
#if IS_ENABLED(CONFIG_IPV6)
1777 1778
	del_timer_sync(&br->ip6_other_query.timer);
	del_timer_sync(&br->ip6_own_query.timer);
1779
#endif
1780 1781 1782 1783 1784 1785 1786 1787 1788
}

void br_multicast_dev_del(struct net_bridge *br)
{
	struct net_bridge_mdb_htable *mdb;
	struct net_bridge_mdb_entry *mp;
	struct hlist_node *n;
	u32 ver;
	int i;
1789 1790

	spin_lock_bh(&br->multicast_lock);
1791
	mdb = mlock_dereference(br->mdb, br);
1792 1793 1794 1795 1796 1797 1798
	if (!mdb)
		goto out;

	br->mdb = NULL;

	ver = mdb->ver;
	for (i = 0; i < mdb->max; i++) {
1799
		hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1800 1801 1802 1803 1804 1805 1806 1807
					  hlist[ver]) {
			del_timer(&mp->timer);
			call_rcu_bh(&mp->rcu, br_multicast_free_group);
		}
	}

	if (mdb->old) {
		spin_unlock_bh(&br->multicast_lock);
1808
		rcu_barrier_bh();
1809 1810 1811 1812 1813 1814 1815 1816 1817 1818
		spin_lock_bh(&br->multicast_lock);
		WARN_ON(mdb->old);
	}

	mdb->old = mdb;
	call_rcu_bh(&mdb->rcu, br_mdb_free);

out:
	spin_unlock_bh(&br->multicast_lock);
}
1819 1820 1821

int br_multicast_set_router(struct net_bridge *br, unsigned long val)
{
1822
	int err = -EINVAL;
1823 1824 1825 1826

	spin_lock_bh(&br->multicast_lock);

	switch (val) {
1827 1828
	case MDB_RTR_TYPE_DISABLED:
	case MDB_RTR_TYPE_PERM:
1829 1830
		del_timer(&br->multicast_router_timer);
		/* fall through */
1831
	case MDB_RTR_TYPE_TEMP_QUERY:
1832 1833 1834 1835 1836 1837 1838 1839 1840 1841
		br->multicast_router = val;
		err = 0;
		break;
	}

	spin_unlock_bh(&br->multicast_lock);

	return err;
}

1842 1843 1844 1845 1846 1847 1848 1849
static void __del_port_router(struct net_bridge_port *p)
{
	if (hlist_unhashed(&p->rlist))
		return;
	hlist_del_init_rcu(&p->rlist);
	br_rtr_notify(p->br->dev, p, RTM_DELMDB);
}

1850 1851 1852
int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
{
	struct net_bridge *br = p->br;
1853
	int err = -EINVAL;
1854 1855

	spin_lock(&br->multicast_lock);
1856 1857 1858 1859
	if (p->multicast_router == val) {
		err = 0;
		goto unlock;
	}
1860
	switch (val) {
1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871
	case MDB_RTR_TYPE_DISABLED:
		p->multicast_router = MDB_RTR_TYPE_DISABLED;
		__del_port_router(p);
		del_timer(&p->multicast_router_timer);
		break;
	case MDB_RTR_TYPE_TEMP_QUERY:
		p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
		__del_port_router(p);
		break;
	case MDB_RTR_TYPE_PERM:
		p->multicast_router = MDB_RTR_TYPE_PERM;
1872 1873 1874
		del_timer(&p->multicast_router_timer);
		br_multicast_add_router(br, p);
		break;
1875 1876
	default:
		goto unlock;
1877
	}
1878 1879
	err = 0;
unlock:
1880 1881 1882 1883
	spin_unlock(&br->multicast_lock);

	return err;
}
1884

1885
static void br_multicast_start_querier(struct net_bridge *br,
1886
				       struct bridge_mcast_own_query *query)
1887 1888
{
	struct net_bridge_port *port;
1889

1890
	__br_multicast_open(br, query);
1891 1892 1893 1894 1895 1896

	list_for_each_entry(port, &br->port_list, list) {
		if (port->state == BR_STATE_DISABLED ||
		    port->state == BR_STATE_BLOCKING)
			continue;

1897 1898
		if (query == &br->ip4_own_query)
			br_multicast_enable(&port->ip4_own_query);
1899 1900
#if IS_ENABLED(CONFIG_IPV6)
		else
1901
			br_multicast_enable(&port->ip6_own_query);
1902
#endif
1903 1904 1905 1906 1907
	}
}

int br_multicast_toggle(struct net_bridge *br, unsigned long val)
{
1908
	int err = 0;
1909
	struct net_bridge_mdb_htable *mdb;
1910

1911
	spin_lock_bh(&br->multicast_lock);
1912 1913 1914 1915 1916 1917 1918
	if (br->multicast_disabled == !val)
		goto unlock;

	br->multicast_disabled = !val;
	if (br->multicast_disabled)
		goto unlock;

1919 1920 1921
	if (!netif_running(br->dev))
		goto unlock;

1922 1923 1924
	mdb = mlock_dereference(br->mdb, br);
	if (mdb) {
		if (mdb->old) {
1925 1926 1927 1928 1929 1930
			err = -EEXIST;
rollback:
			br->multicast_disabled = !!val;
			goto unlock;
		}

1931
		err = br_mdb_rehash(&br->mdb, mdb->max,
1932 1933 1934 1935 1936
				    br->hash_elasticity);
		if (err)
			goto rollback;
	}

1937
	br_multicast_start_querier(br, &br->ip4_own_query);
1938
#if IS_ENABLED(CONFIG_IPV6)
1939
	br_multicast_start_querier(br, &br->ip6_own_query);
1940
#endif
1941 1942

unlock:
1943
	spin_unlock_bh(&br->multicast_lock);
1944 1945 1946

	return err;
}
1947

1948 1949
int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
{
1950 1951
	unsigned long max_delay;

1952 1953 1954 1955 1956 1957 1958
	val = !!val;

	spin_lock_bh(&br->multicast_lock);
	if (br->multicast_querier == val)
		goto unlock;

	br->multicast_querier = val;
1959 1960 1961 1962 1963
	if (!val)
		goto unlock;

	max_delay = br->multicast_query_response_interval;

1964 1965
	if (!timer_pending(&br->ip4_other_query.timer))
		br->ip4_other_query.delay_time = jiffies + max_delay;
1966

1967
	br_multicast_start_querier(br, &br->ip4_own_query);
1968 1969

#if IS_ENABLED(CONFIG_IPV6)
1970 1971
	if (!timer_pending(&br->ip6_other_query.timer))
		br->ip6_other_query.delay_time = jiffies + max_delay;
1972

1973
	br_multicast_start_querier(br, &br->ip6_own_query);
1974
#endif
1975 1976 1977 1978 1979 1980 1981

unlock:
	spin_unlock_bh(&br->multicast_lock);

	return 0;
}

1982 1983
int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
{
1984
	int err = -EINVAL;
1985
	u32 old;
1986
	struct net_bridge_mdb_htable *mdb;
1987

1988
	spin_lock_bh(&br->multicast_lock);
1989 1990
	if (!is_power_of_2(val))
		goto unlock;
1991 1992 1993

	mdb = mlock_dereference(br->mdb, br);
	if (mdb && val < mdb->size)
1994 1995 1996 1997 1998 1999 2000
		goto unlock;

	err = 0;

	old = br->hash_max;
	br->hash_max = val;

2001 2002
	if (mdb) {
		if (mdb->old) {
2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015
			err = -EEXIST;
rollback:
			br->hash_max = old;
			goto unlock;
		}

		err = br_mdb_rehash(&br->mdb, br->hash_max,
				    br->hash_elasticity);
		if (err)
			goto rollback;
	}

unlock:
2016
	spin_unlock_bh(&br->multicast_lock);
2017 2018 2019

	return err;
}
2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076

/**
 * br_multicast_list_adjacent - Returns snooped multicast addresses
 * @dev:	The bridge port adjacent to which to retrieve addresses
 * @br_ip_list:	The list to store found, snooped multicast IP addresses in
 *
 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
 * snooping feature on all bridge ports of dev's bridge device, excluding
 * the addresses from dev itself.
 *
 * Returns the number of items added to br_ip_list.
 *
 * Notes:
 * - br_ip_list needs to be initialized by caller
 * - br_ip_list might contain duplicates in the end
 *   (needs to be taken care of by caller)
 * - br_ip_list needs to be freed by caller
 */
int br_multicast_list_adjacent(struct net_device *dev,
			       struct list_head *br_ip_list)
{
	struct net_bridge *br;
	struct net_bridge_port *port;
	struct net_bridge_port_group *group;
	struct br_ip_list *entry;
	int count = 0;

	rcu_read_lock();
	if (!br_ip_list || !br_port_exists(dev))
		goto unlock;

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

	br = port->br;

	list_for_each_entry_rcu(port, &br->port_list, list) {
		if (!port->dev || port->dev == dev)
			continue;

		hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
			entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
			if (!entry)
				goto unlock;

			entry->addr = group->addr;
			list_add(&entry->list, br_ip_list);
			count++;
		}
	}

unlock:
	rcu_read_unlock();
	return count;
}
EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2077

2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114
/**
 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
 * @dev: The bridge port providing the bridge on which to check for a querier
 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
 *
 * Checks whether the given interface has a bridge on top and if so returns
 * true if a valid querier exists anywhere on the bridged link layer.
 * Otherwise returns false.
 */
bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
{
	struct net_bridge *br;
	struct net_bridge_port *port;
	struct ethhdr eth;
	bool ret = false;

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

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

	br = port->br;

	memset(&eth, 0, sizeof(eth));
	eth.h_proto = htons(proto);

	ret = br_multicast_querier_exists(br, &eth);

unlock:
	rcu_read_unlock();
	return ret;
}
EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);

2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145
/**
 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
 * @dev: The bridge port adjacent to which to check for a querier
 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
 *
 * Checks whether the given interface has a bridge on top and if so returns
 * true if a selected querier is behind one of the other ports of this
 * bridge. Otherwise returns false.
 */
bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
{
	struct net_bridge *br;
	struct net_bridge_port *port;
	bool ret = false;

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

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

	br = port->br;

	switch (proto) {
	case ETH_P_IP:
		if (!timer_pending(&br->ip4_other_query.timer) ||
		    rcu_dereference(br->ip4_querier.port) == port)
			goto unlock;
		break;
2146
#if IS_ENABLED(CONFIG_IPV6)
2147 2148 2149 2150 2151
	case ETH_P_IPV6:
		if (!timer_pending(&br->ip6_other_query.timer) ||
		    rcu_dereference(br->ip6_querier.port) == port)
			goto unlock;
		break;
2152
#endif
2153 2154 2155 2156 2157 2158 2159 2160 2161 2162
	default:
		goto unlock;
	}

	ret = true;
unlock:
	rcu_read_unlock();
	return ret;
}
EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);