br_multicast.c 39.8 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>
#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>
#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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#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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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;
	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;
}

static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip)
54
{
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	return jhash_1word(mdb->secret, (__force u32)ip) & (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,
				const struct in6_addr *ip)
{
	return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1);
}
#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):
		return __br_ip4_hash(mdb, ip->u.ip4);
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#if IS_ENABLED(CONFIG_IPV6)
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	case htons(ETH_P_IPV6):
		return __br_ip6_hash(mdb, &ip->u.ip6);
#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;
	struct hlist_node *p;

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	hlist_for_each_entry_rcu(mp, p, &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)
{
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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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	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(
	struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst)
{
	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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	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,
					struct sk_buff *skb)
{
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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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	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;
	struct hlist_node *p;
	int maxlen;
	int len;
	int i;

	for (i = 0; i < old->max; i++)
		hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver])
			hlist_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;
		hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver])
			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);
		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) ||
	    hlist_unhashed(&pg->mglist))
		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);

	memcpy(eth->h_source, br->dev->dev_addr, 6);
	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;
	iph->saddr = 0;
	iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
	((u8 *)&iph[1])[0] = IPOPT_RA;
	((u8 *)&iph[1])[1] = 4;
	((u8 *)&iph[1])[2] = 0;
	((u8 *)&iph[1])[3] = 0;
	ip_send_check(iph);
	skb_put(skb, 24);

	skb_set_transport_header(skb, skb->len);
	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)
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static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
405
						    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);

	memcpy(eth->h_source, br->dev->dev_addr, 6);
	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);
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	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;
	}
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	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);

	interval = ipv6_addr_any(group) ? br->multicast_last_member_interval :
					  br->multicast_query_response_interval;

	mldq->mld_type = ICMPV6_MGM_QUERY;
	mldq->mld_code = 0;
	mldq->mld_cksum = 0;
	mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
	mldq->mld_reserved = 0;
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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;
}

499
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)
502
{
503
	struct net_bridge_mdb_htable *mdb;
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	struct net_bridge_mdb_entry *mp;
	struct hlist_node *p;
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	unsigned int count = 0;
	unsigned int max;
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	int elasticity;
	int err;

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	mdb = rcu_dereference_protected(br->mdb, 1);
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	hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
		count++;
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		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)
576
{
577
	struct net_bridge_mdb_htable *mdb;
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	struct net_bridge_mdb_entry *mp;
	int hash;
580
	int err;
581

582
	mdb = rcu_dereference_protected(br->mdb, 1);
583
	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:
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		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))
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		return ERR_PTR(-ENOMEM);
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	mp->br = br;
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	mp->addr = *group;
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	setup_timer(&mp->timer, br_multicast_group_expired,
		    (unsigned long)mp);

	hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
	mdb->size++;

out:
	return mp;
}

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struct net_bridge_port_group *br_multicast_new_port_group(
			struct net_bridge_port *port,
			struct br_ip *group,
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			struct net_bridge_port_group __rcu *next)
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{
	struct net_bridge_port_group *p;

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

	p->addr = *group;
	p->port = port;
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	rcu_assign_pointer(p->next, next);
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	hlist_add_head(&p->mglist, &port->mglist);
	setup_timer(&p->timer, br_multicast_port_group_expired,
		    (unsigned long)p);
	return p;
}

642
static int br_multicast_add_group(struct net_bridge *br,
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				  struct net_bridge_port *port,
				  struct br_ip *group)
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{
	struct net_bridge_mdb_entry *mp;
	struct net_bridge_port_group *p;
648
	struct net_bridge_port_group __rcu **pp;
649 650 651 652 653 654 655 656 657 658
	unsigned long now = jiffies;
	int err;

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

	mp = br_multicast_new_group(br, port, group);
	err = PTR_ERR(mp);
659
	if (IS_ERR(mp))
660 661 662
		goto err;

	if (!port) {
663
		mp->mglist = true;
664 665 666 667
		mod_timer(&mp->timer, now + br->multicast_membership_interval);
		goto out;
	}

668 669 670
	for (pp = &mp->ports;
	     (p = mlock_dereference(*pp, br)) != NULL;
	     pp = &p->next) {
671 672 673 674 675 676
		if (p->port == port)
			goto found;
		if ((unsigned long)p->port < (unsigned long)port)
			break;
	}

677
	p = br_multicast_new_port_group(port, group, *pp);
678 679 680
	if (unlikely(!p))
		goto err;
	rcu_assign_pointer(*pp, p);
C
Cong Wang 已提交
681
	br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
682 683 684 685 686 687 688 689 690 691 692

found:
	mod_timer(&p->timer, now + br->multicast_membership_interval);
out:
	err = 0;

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

693 694 695 696 697 698 699 700 701 702 703 704 705 706 707
static int br_ip4_multicast_add_group(struct net_bridge *br,
				      struct net_bridge_port *port,
				      __be32 group)
{
	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);

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

E
Eric Dumazet 已提交
708
#if IS_ENABLED(CONFIG_IPV6)
709 710 711 712 713 714
static int br_ip6_multicast_add_group(struct net_bridge *br,
				      struct net_bridge_port *port,
				      const struct in6_addr *group)
{
	struct br_ip br_group;

715
	if (!ipv6_is_transient_multicast(group))
716 717
		return 0;

A
Alexey Dobriyan 已提交
718
	br_group.u.ip6 = *group;
719
	br_group.proto = htons(ETH_P_IPV6);
720 721 722 723 724

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

725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745
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);
	if (port->multicast_router != 1 ||
	    timer_pending(&port->multicast_router_timer) ||
	    hlist_unhashed(&port->rlist))
		goto out;

	hlist_del_init_rcu(&port->rlist);

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

static void br_multicast_local_router_expired(unsigned long data)
{
}

746 747
static void br_multicast_querier_expired(unsigned long data)
{
748
	struct net_bridge *br = (void *)data;
749 750 751 752 753 754 755 756 757 758 759

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

	br_multicast_start_querier(br);

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

760 761 762
static void __br_multicast_send_query(struct net_bridge *br,
				      struct net_bridge_port *port,
				      struct br_ip *ip)
763 764 765
{
	struct sk_buff *skb;

766
	skb = br_multicast_alloc_query(br, ip);
767
	if (!skb)
768
		return;
769 770 771 772

	if (port) {
		__skb_push(skb, sizeof(struct ethhdr));
		skb->dev = port->dev;
773
		NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
774 775 776
			dev_queue_xmit);
	} else
		netif_rx(skb);
777 778 779 780 781 782 783 784 785
}

static void br_multicast_send_query(struct net_bridge *br,
				    struct net_bridge_port *port, u32 sent)
{
	unsigned long time;
	struct br_ip br_group;

	if (!netif_running(br->dev) || br->multicast_disabled ||
786
	    !br->multicast_querier ||
787 788 789
	    timer_pending(&br->multicast_querier_timer))
		return;

790 791
	memset(&br_group.u, 0, sizeof(br_group.u));

792
	br_group.proto = htons(ETH_P_IP);
793
	__br_multicast_send_query(br, port, &br_group);
794

E
Eric Dumazet 已提交
795
#if IS_ENABLED(CONFIG_IPV6)
796
	br_group.proto = htons(ETH_P_IPV6);
797
	__br_multicast_send_query(br, port, &br_group);
798
#endif
799 800 801 802 803 804 805 806 807 808 809 810 811 812 813

	time = jiffies;
	time += sent < br->multicast_startup_query_count ?
		br->multicast_startup_query_interval :
		br->multicast_query_interval;
	mod_timer(port ? &port->multicast_query_timer :
			 &br->multicast_query_timer, time);
}

static void br_multicast_port_query_expired(unsigned long data)
{
	struct net_bridge_port *port = (void *)data;
	struct net_bridge *br = port->br;

	spin_lock(&br->multicast_lock);
814 815
	if (port->state == BR_STATE_DISABLED ||
	    port->state == BR_STATE_BLOCKING)
816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843
		goto out;

	if (port->multicast_startup_queries_sent <
	    br->multicast_startup_query_count)
		port->multicast_startup_queries_sent++;

	br_multicast_send_query(port->br, port,
				port->multicast_startup_queries_sent);

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

void br_multicast_add_port(struct net_bridge_port *port)
{
	port->multicast_router = 1;

	setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
		    (unsigned long)port);
	setup_timer(&port->multicast_query_timer,
		    br_multicast_port_query_expired, (unsigned long)port);
}

void br_multicast_del_port(struct net_bridge_port *port)
{
	del_timer_sync(&port->multicast_router_timer);
}

844 845 846 847 848 849 850 851 852
static void __br_multicast_enable_port(struct net_bridge_port *port)
{
	port->multicast_startup_queries_sent = 0;

	if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
	    del_timer(&port->multicast_query_timer))
		mod_timer(&port->multicast_query_timer, jiffies);
}

853 854 855 856 857 858 859 860
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;

861
	__br_multicast_enable_port(port);
862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883

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;
	struct hlist_node *p, *n;

	spin_lock(&br->multicast_lock);
	hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist)
		br_multicast_del_pg(br, pg);

	if (!hlist_unhashed(&port->rlist))
		hlist_del_init_rcu(&port->rlist);
	del_timer(&port->multicast_router_timer);
	del_timer(&port->multicast_query_timer);
	spin_unlock(&br->multicast_lock);
}

884 885 886
static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
					 struct net_bridge_port *port,
					 struct sk_buff *skb)
887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908
{
	struct igmpv3_report *ih;
	struct igmpv3_grec *grec;
	int i;
	int len;
	int num;
	int type;
	int err = 0;
	__be32 group;

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

	ih = igmpv3_report_hdr(skb);
	num = ntohs(ih->ngrec);
	len = sizeof(*ih);

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

H
Herbert Xu 已提交
909
		grec = (void *)(skb->data + len - sizeof(*grec));
910 911 912
		group = grec->grec_mca;
		type = grec->grec_type;

E
Eric Dumazet 已提交
913
		len += ntohs(grec->grec_nsrcs) * 4;
914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930
		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;
		}

931
		err = br_ip4_multicast_add_group(br, port, group);
932 933 934 935 936 937 938
		if (err)
			break;
	}

	return err;
}

E
Eric Dumazet 已提交
939
#if IS_ENABLED(CONFIG_IPV6)
940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962
static int br_ip6_multicast_mld2_report(struct net_bridge *br,
					struct net_bridge_port *port,
					struct sk_buff *skb)
{
	struct icmp6hdr *icmp6h;
	struct mld2_grec *grec;
	int i;
	int len;
	int num;
	int err = 0;

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

	icmp6h = icmp6_hdr(skb);
	num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
	len = sizeof(*icmp6h);

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

		nsrcs = skb_header_pointer(skb,
					   len + offsetof(struct mld2_grec,
963
							  grec_nsrcs),
964 965 966 967 968 969
					   sizeof(_nsrcs), &_nsrcs);
		if (!nsrcs)
			return -EINVAL;

		if (!pskb_may_pull(skb,
				   len + sizeof(*grec) +
970
				   sizeof(struct in6_addr) * ntohs(*nsrcs)))
971 972 973
			return -EINVAL;

		grec = (struct mld2_grec *)(skb->data + len);
974 975
		len += sizeof(*grec) +
		       sizeof(struct in6_addr) * ntohs(*nsrcs);
976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999

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

		default:
			continue;
		}

		err = br_ip6_multicast_add_group(br, port, &grec->grec_mca);
		if (!err)
			break;
	}

	return err;
}
#endif

1000 1001 1002 1003 1004
/*
 * Add port to rotuer_list
 *  list is maintained ordered by pointer value
 *  and locked by br->multicast_lock and RCU
 */
1005 1006 1007
static void br_multicast_add_router(struct net_bridge *br,
				    struct net_bridge_port *port)
{
1008
	struct net_bridge_port *p;
1009
	struct hlist_node *n, *slot = NULL;
1010

1011
	hlist_for_each_entry(p, n, &br->router_list, rlist) {
1012 1013 1014
		if ((unsigned long) port >= (unsigned long) p)
			break;
		slot = n;
1015 1016
	}

1017 1018
	if (slot)
		hlist_add_after_rcu(slot, &port->rlist);
1019 1020
	else
		hlist_add_head_rcu(&port->rlist, &br->router_list);
1021 1022
}

1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040
static void br_multicast_mark_router(struct net_bridge *br,
				     struct net_bridge_port *port)
{
	unsigned long now = jiffies;

	if (!port) {
		if (br->multicast_router == 1)
			mod_timer(&br->multicast_router_timer,
				  now + br->multicast_querier_interval);
		return;
	}

	if (port->multicast_router != 1)
		return;

	if (!hlist_unhashed(&port->rlist))
		goto timer;

1041
	br_multicast_add_router(br, port);
1042 1043 1044 1045 1046 1047 1048 1049

timer:
	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,
1050
					int saddr)
1051 1052 1053 1054 1055 1056 1057 1058 1059 1060
{
	if (saddr)
		mod_timer(&br->multicast_querier_timer,
			  jiffies + br->multicast_querier_interval);
	else if (timer_pending(&br->multicast_querier_timer))
		return;

	br_multicast_mark_router(br, port);
}

1061 1062 1063
static int br_ip4_multicast_query(struct net_bridge *br,
				  struct net_bridge_port *port,
				  struct sk_buff *skb)
1064
{
1065
	const struct iphdr *iph = ip_hdr(skb);
1066 1067 1068 1069
	struct igmphdr *ih = igmp_hdr(skb);
	struct net_bridge_mdb_entry *mp;
	struct igmpv3_query *ih3;
	struct net_bridge_port_group *p;
1070
	struct net_bridge_port_group __rcu **pp;
1071 1072 1073
	unsigned long max_delay;
	unsigned long now = jiffies;
	__be32 group;
1074
	int err = 0;
1075 1076 1077 1078 1079 1080

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

1081
	br_multicast_query_received(br, port, !!iph->saddr);
1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092

	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;
		}
	} else {
1093 1094 1095 1096
		if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
			err = -EINVAL;
			goto out;
		}
1097 1098 1099

		ih3 = igmpv3_query_hdr(skb);
		if (ih3->nsrcs)
1100
			goto out;
1101

1102 1103
		max_delay = ih3->code ?
			    IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1104 1105 1106 1107 1108
	}

	if (!group)
		goto out;

1109
	mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group);
1110 1111 1112 1113 1114
	if (!mp)
		goto out;

	max_delay *= br->multicast_last_member_count;

1115
	if (mp->mglist &&
1116 1117 1118 1119 1120
	    (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);

1121 1122 1123
	for (pp = &mp->ports;
	     (p = mlock_dereference(*pp, br)) != NULL;
	     pp = &p->next) {
1124 1125 1126
		if (timer_pending(&p->timer) ?
		    time_after(p->timer.expires, now + max_delay) :
		    try_to_del_timer_sync(&p->timer) >= 0)
1127
			mod_timer(&p->timer, now + max_delay);
1128 1129 1130 1131
	}

out:
	spin_unlock(&br->multicast_lock);
1132
	return err;
1133 1134
}

E
Eric Dumazet 已提交
1135
#if IS_ENABLED(CONFIG_IPV6)
1136 1137 1138 1139
static int br_ip6_multicast_query(struct net_bridge *br,
				  struct net_bridge_port *port,
				  struct sk_buff *skb)
{
1140
	const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1141
	struct mld_msg *mld;
1142 1143
	struct net_bridge_mdb_entry *mp;
	struct mld2_query *mld2q;
1144 1145
	struct net_bridge_port_group *p;
	struct net_bridge_port_group __rcu **pp;
1146 1147
	unsigned long max_delay;
	unsigned long now = jiffies;
1148
	const struct in6_addr *group = NULL;
1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163
	int err = 0;

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

	br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr));

	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
1164
		max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1165 1166 1167
		if (max_delay)
			group = &mld->mld_mca;
	} else if (skb->len >= sizeof(*mld2q)) {
1168
		u16 mrc;
1169 1170 1171 1172 1173 1174 1175
		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;
1176 1177
		mrc = ntohs(mld2q->mld2q_mrc);
		max_delay = mrc ? MLDV2_MRC(mrc) : 1;
1178 1179 1180 1181 1182
	}

	if (!group)
		goto out;

1183
	mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group);
1184 1185 1186 1187
	if (!mp)
		goto out;

	max_delay *= br->multicast_last_member_count;
1188
	if (mp->mglist &&
1189 1190 1191 1192 1193
	    (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);

1194 1195 1196
	for (pp = &mp->ports;
	     (p = mlock_dereference(*pp, br)) != NULL;
	     pp = &p->next) {
1197 1198 1199
		if (timer_pending(&p->timer) ?
		    time_after(p->timer.expires, now + max_delay) :
		    try_to_del_timer_sync(&p->timer) >= 0)
1200
			mod_timer(&p->timer, now + max_delay);
1201 1202 1203 1204 1205 1206 1207 1208
	}

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

1209 1210
static void br_multicast_leave_group(struct net_bridge *br,
				     struct net_bridge_port *port,
1211
				     struct br_ip *group)
1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224
{
	struct net_bridge_mdb_htable *mdb;
	struct net_bridge_mdb_entry *mp;
	struct net_bridge_port_group *p;
	unsigned long now;
	unsigned long time;

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

1225
	mdb = mlock_dereference(br->mdb, br);
1226 1227 1228 1229
	mp = br_mdb_ip_get(mdb, group);
	if (!mp)
		goto out;

1230
	if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242
		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);
C
Cong Wang 已提交
1243
			br_mdb_notify(br->dev, port, group, RTM_DELMDB);
1244 1245 1246 1247 1248 1249 1250 1251

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

1252 1253 1254 1255 1256
	now = jiffies;
	time = now + br->multicast_last_member_count *
		     br->multicast_last_member_interval;

	if (!port) {
1257
		if (mp->mglist &&
1258 1259 1260 1261 1262 1263 1264 1265 1266
		    (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;
	}

1267 1268 1269
	for (p = mlock_dereference(mp->ports, br);
	     p != NULL;
	     p = mlock_dereference(p->next, br)) {
1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286
		if (p->port != port)
			continue;

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

		break;
	}

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

1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301
static void br_ip4_multicast_leave_group(struct net_bridge *br,
					 struct net_bridge_port *port,
					 __be32 group)
{
	struct br_ip br_group;

	if (ipv4_is_local_multicast(group))
		return;

	br_group.u.ip4 = group;
	br_group.proto = htons(ETH_P_IP);

	br_multicast_leave_group(br, port, &br_group);
}

E
Eric Dumazet 已提交
1302
#if IS_ENABLED(CONFIG_IPV6)
1303 1304 1305 1306 1307 1308
static void br_ip6_multicast_leave_group(struct net_bridge *br,
					 struct net_bridge_port *port,
					 const struct in6_addr *group)
{
	struct br_ip br_group;

1309
	if (!ipv6_is_transient_multicast(group))
1310 1311
		return;

A
Alexey Dobriyan 已提交
1312
	br_group.u.ip6 = *group;
1313 1314 1315 1316 1317
	br_group.proto = htons(ETH_P_IPV6);

	br_multicast_leave_group(br, port, &br_group);
}
#endif
1318

1319 1320 1321 1322 1323
static int br_multicast_ipv4_rcv(struct net_bridge *br,
				 struct net_bridge_port *port,
				 struct sk_buff *skb)
{
	struct sk_buff *skb2 = skb;
1324
	const struct iphdr *iph;
1325
	struct igmphdr *ih;
1326 1327
	unsigned int len;
	unsigned int offset;
1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346
	int err;

	/* We treat OOM as packet loss for now. */
	if (!pskb_may_pull(skb, sizeof(*iph)))
		return -EINVAL;

	iph = ip_hdr(skb);

	if (iph->ihl < 5 || iph->version != 4)
		return -EINVAL;

	if (!pskb_may_pull(skb, ip_hdrlen(skb)))
		return -EINVAL;

	iph = ip_hdr(skb);

	if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
		return -EINVAL;

1347 1348 1349
	if (iph->protocol != IPPROTO_IGMP) {
		if ((iph->daddr & IGMP_LOCAL_GROUP_MASK) != IGMP_LOCAL_GROUP)
			BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1350
		return 0;
1351
	}
1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363

	len = ntohs(iph->tot_len);
	if (skb->len < len || len < ip_hdrlen(skb))
		return -EINVAL;

	if (skb->len > len) {
		skb2 = skb_clone(skb, GFP_ATOMIC);
		if (!skb2)
			return -ENOMEM;

		err = pskb_trim_rcsum(skb2, len);
		if (err)
1364
			goto err_out;
1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383
	}

	len -= ip_hdrlen(skb2);
	offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
	__skb_pull(skb2, offset);
	skb_reset_transport_header(skb2);

	err = -EINVAL;
	if (!pskb_may_pull(skb2, sizeof(*ih)))
		goto out;

	switch (skb2->ip_summed) {
	case CHECKSUM_COMPLETE:
		if (!csum_fold(skb2->csum))
			break;
		/* fall through */
	case CHECKSUM_NONE:
		skb2->csum = 0;
		if (skb_checksum_complete(skb2))
1384
			goto out;
1385 1386 1387 1388 1389 1390 1391 1392 1393 1394
	}

	err = 0;

	BR_INPUT_SKB_CB(skb)->igmp = 1;
	ih = igmp_hdr(skb2);

	switch (ih->type) {
	case IGMP_HOST_MEMBERSHIP_REPORT:
	case IGMPV2_HOST_MEMBERSHIP_REPORT:
1395
		BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1396
		err = br_ip4_multicast_add_group(br, port, ih->group);
1397 1398
		break;
	case IGMPV3_HOST_MEMBERSHIP_REPORT:
1399
		err = br_ip4_multicast_igmp3_report(br, port, skb2);
1400 1401
		break;
	case IGMP_HOST_MEMBERSHIP_QUERY:
1402
		err = br_ip4_multicast_query(br, port, skb2);
1403 1404
		break;
	case IGMP_HOST_LEAVE_MESSAGE:
1405
		br_ip4_multicast_leave_group(br, port, ih->group);
1406 1407 1408 1409 1410
		break;
	}

out:
	__skb_push(skb2, offset);
1411
err_out:
1412 1413 1414 1415 1416
	if (skb2 != skb)
		kfree_skb(skb2);
	return err;
}

E
Eric Dumazet 已提交
1417
#if IS_ENABLED(CONFIG_IPV6)
1418 1419 1420 1421
static int br_multicast_ipv6_rcv(struct net_bridge *br,
				 struct net_bridge_port *port,
				 struct sk_buff *skb)
{
1422
	struct sk_buff *skb2;
1423
	const struct ipv6hdr *ip6h;
1424
	u8 icmp6_type;
1425
	u8 nexthdr;
1426
	__be16 frag_off;
1427
	unsigned int len;
K
Kulikov Vasiliy 已提交
1428
	int offset;
1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446
	int err;

	if (!pskb_may_pull(skb, sizeof(*ip6h)))
		return -EINVAL;

	ip6h = ipv6_hdr(skb);

	/*
	 * We're interested in MLD messages only.
	 *  - Version is 6
	 *  - MLD has always Router Alert hop-by-hop option
	 *  - But we do not support jumbrograms.
	 */
	if (ip6h->version != 6 ||
	    ip6h->nexthdr != IPPROTO_HOPOPTS ||
	    ip6h->payload_len == 0)
		return 0;

1447
	len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
1448 1449 1450 1451
	if (skb->len < len)
		return -EINVAL;

	nexthdr = ip6h->nexthdr;
1452
	offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
1453 1454 1455 1456 1457 1458 1459 1460 1461

	if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
		return 0;

	/* Okay, we found ICMPv6 header */
	skb2 = skb_clone(skb, GFP_ATOMIC);
	if (!skb2)
		return -ENOMEM;

1462 1463 1464 1465
	err = -EINVAL;
	if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
		goto out;

1466 1467 1468 1469
	len -= offset - skb_network_offset(skb2);

	__skb_pull(skb2, offset);
	skb_reset_transport_header(skb2);
1470 1471
	skb_postpull_rcsum(skb2, skb_network_header(skb2),
			   skb_network_header_len(skb2));
1472

1473
	icmp6_type = icmp6_hdr(skb2)->icmp6_type;
1474

1475
	switch (icmp6_type) {
1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490
	case ICMPV6_MGM_QUERY:
	case ICMPV6_MGM_REPORT:
	case ICMPV6_MGM_REDUCTION:
	case ICMPV6_MLD2_REPORT:
		break;
	default:
		err = 0;
		goto out;
	}

	/* Okay, we found MLD message. Check further. */
	if (skb2->len > len) {
		err = pskb_trim_rcsum(skb2, len);
		if (err)
			goto out;
1491
		err = -EINVAL;
1492 1493
	}

1494 1495
	ip6h = ipv6_hdr(skb2);

1496 1497
	switch (skb2->ip_summed) {
	case CHECKSUM_COMPLETE:
1498 1499
		if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
					IPPROTO_ICMPV6, skb2->csum))
1500 1501 1502
			break;
		/*FALLTHROUGH*/
	case CHECKSUM_NONE:
1503 1504 1505 1506 1507
		skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
							&ip6h->daddr,
							skb2->len,
							IPPROTO_ICMPV6, 0));
		if (__skb_checksum_complete(skb2))
1508 1509 1510 1511 1512 1513 1514
			goto out;
	}

	err = 0;

	BR_INPUT_SKB_CB(skb)->igmp = 1;

1515
	switch (icmp6_type) {
1516 1517
	case ICMPV6_MGM_REPORT:
	    {
1518 1519 1520 1521 1522 1523
		struct mld_msg *mld;
		if (!pskb_may_pull(skb2, sizeof(*mld))) {
			err = -EINVAL;
			goto out;
		}
		mld = (struct mld_msg *)skb_transport_header(skb2);
1524
		BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535
		err = br_ip6_multicast_add_group(br, port, &mld->mld_mca);
		break;
	    }
	case ICMPV6_MLD2_REPORT:
		err = br_ip6_multicast_mld2_report(br, port, skb2);
		break;
	case ICMPV6_MGM_QUERY:
		err = br_ip6_multicast_query(br, port, skb2);
		break;
	case ICMPV6_MGM_REDUCTION:
	    {
1536 1537 1538 1539 1540 1541
		struct mld_msg *mld;
		if (!pskb_may_pull(skb2, sizeof(*mld))) {
			err = -EINVAL;
			goto out;
		}
		mld = (struct mld_msg *)skb_transport_header(skb2);
1542 1543 1544 1545 1546
		br_ip6_multicast_leave_group(br, port, &mld->mld_mca);
	    }
	}

out:
1547
	kfree_skb(skb2);
1548 1549 1550 1551
	return err;
}
#endif

1552 1553 1554
int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
		     struct sk_buff *skb)
{
1555 1556 1557
	BR_INPUT_SKB_CB(skb)->igmp = 0;
	BR_INPUT_SKB_CB(skb)->mrouters_only = 0;

1558 1559 1560 1561 1562 1563
	if (br->multicast_disabled)
		return 0;

	switch (skb->protocol) {
	case htons(ETH_P_IP):
		return br_multicast_ipv4_rcv(br, port, skb);
E
Eric Dumazet 已提交
1564
#if IS_ENABLED(CONFIG_IPV6)
1565 1566 1567
	case htons(ETH_P_IPV6):
		return br_multicast_ipv6_rcv(br, port, skb);
#endif
1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592
	}

	return 0;
}

static void br_multicast_query_expired(unsigned long data)
{
	struct net_bridge *br = (void *)data;

	spin_lock(&br->multicast_lock);
	if (br->multicast_startup_queries_sent <
	    br->multicast_startup_query_count)
		br->multicast_startup_queries_sent++;

	br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);

	spin_unlock(&br->multicast_lock);
}

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

	br->multicast_router = 1;
1593
	br->multicast_querier = 0;
1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607
	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;

	spin_lock_init(&br->multicast_lock);
	setup_timer(&br->multicast_router_timer,
		    br_multicast_local_router_expired, 0);
	setup_timer(&br->multicast_querier_timer,
1608
		    br_multicast_querier_expired, (unsigned long)br);
1609 1610
	setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
		    (unsigned long)br);
1611
	br_mdb_init();
1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636
}

void br_multicast_open(struct net_bridge *br)
{
	br->multicast_startup_queries_sent = 0;

	if (br->multicast_disabled)
		return;

	mod_timer(&br->multicast_query_timer, jiffies);
}

void br_multicast_stop(struct net_bridge *br)
{
	struct net_bridge_mdb_htable *mdb;
	struct net_bridge_mdb_entry *mp;
	struct hlist_node *p, *n;
	u32 ver;
	int i;

	del_timer_sync(&br->multicast_router_timer);
	del_timer_sync(&br->multicast_querier_timer);
	del_timer_sync(&br->multicast_query_timer);

	spin_lock_bh(&br->multicast_lock);
1637
	mdb = mlock_dereference(br->mdb, br);
1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653
	if (!mdb)
		goto out;

	br->mdb = NULL;

	ver = mdb->ver;
	for (i = 0; i < mdb->max; i++) {
		hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i],
					  hlist[ver]) {
			del_timer(&mp->timer);
			call_rcu_bh(&mp->rcu, br_multicast_free_group);
		}
	}

	if (mdb->old) {
		spin_unlock_bh(&br->multicast_lock);
1654
		rcu_barrier_bh();
1655 1656 1657 1658 1659 1660 1661 1662 1663 1664
		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);
}
1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734

int br_multicast_set_router(struct net_bridge *br, unsigned long val)
{
	int err = -ENOENT;

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

	switch (val) {
	case 0:
	case 2:
		del_timer(&br->multicast_router_timer);
		/* fall through */
	case 1:
		br->multicast_router = val;
		err = 0;
		break;

	default:
		err = -EINVAL;
		break;
	}

unlock:
	spin_unlock_bh(&br->multicast_lock);

	return err;
}

int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
{
	struct net_bridge *br = p->br;
	int err = -ENOENT;

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

	switch (val) {
	case 0:
	case 1:
	case 2:
		p->multicast_router = val;
		err = 0;

		if (val < 2 && !hlist_unhashed(&p->rlist))
			hlist_del_init_rcu(&p->rlist);

		if (val == 1)
			break;

		del_timer(&p->multicast_router_timer);

		if (val == 0)
			break;

		br_multicast_add_router(br, p);
		break;

	default:
		err = -EINVAL;
		break;
	}

unlock:
	spin_unlock(&br->multicast_lock);

	return err;
}
1735

1736
static void br_multicast_start_querier(struct net_bridge *br)
1737 1738
{
	struct net_bridge_port *port;
1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752

	br_multicast_open(br);

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

		__br_multicast_enable_port(port);
	}
}

int br_multicast_toggle(struct net_bridge *br, unsigned long val)
{
1753
	int err = 0;
1754
	struct net_bridge_mdb_htable *mdb;
1755

1756
	spin_lock_bh(&br->multicast_lock);
1757 1758 1759 1760 1761 1762 1763
	if (br->multicast_disabled == !val)
		goto unlock;

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

1764 1765 1766
	if (!netif_running(br->dev))
		goto unlock;

1767 1768 1769
	mdb = mlock_dereference(br->mdb, br);
	if (mdb) {
		if (mdb->old) {
1770 1771 1772 1773 1774 1775
			err = -EEXIST;
rollback:
			br->multicast_disabled = !!val;
			goto unlock;
		}

1776
		err = br_mdb_rehash(&br->mdb, mdb->max,
1777 1778 1779 1780 1781
				    br->hash_elasticity);
		if (err)
			goto rollback;
	}

1782
	br_multicast_start_querier(br);
1783 1784

unlock:
1785
	spin_unlock_bh(&br->multicast_lock);
1786 1787 1788

	return err;
}
1789

1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807
int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
{
	val = !!val;

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

	br->multicast_querier = val;
	if (val)
		br_multicast_start_querier(br);

unlock:
	spin_unlock_bh(&br->multicast_lock);

	return 0;
}

1808 1809 1810 1811
int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
{
	int err = -ENOENT;
	u32 old;
1812
	struct net_bridge_mdb_htable *mdb;
1813 1814 1815 1816 1817 1818 1819 1820

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

	err = -EINVAL;
	if (!is_power_of_2(val))
		goto unlock;
1821 1822 1823

	mdb = mlock_dereference(br->mdb, br);
	if (mdb && val < mdb->size)
1824 1825 1826 1827 1828 1829 1830
		goto unlock;

	err = 0;

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

1831 1832
	if (mdb) {
		if (mdb->old) {
1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849
			err = -EEXIST;
rollback:
			br->hash_max = old;
			goto unlock;
		}

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

unlock:
	spin_unlock(&br->multicast_lock);

	return err;
}