1/*
   2 * Bridge multicast support.
   3 *
   4 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
   5 *
   6 * This program is free software; you can redistribute it and/or modify it
   7 * under the terms of the GNU General Public License as published by the Free
   8 * Software Foundation; either version 2 of the License, or (at your option)
   9 * any later version.
  10 *
  11 */
  12
  13#include <linux/err.h>
  14#include <linux/export.h>
  15#include <linux/if_ether.h>
  16#include <linux/igmp.h>
  17#include <linux/jhash.h>
  18#include <linux/kernel.h>
  19#include <linux/log2.h>
  20#include <linux/netdevice.h>
  21#include <linux/netfilter_bridge.h>
  22#include <linux/random.h>
  23#include <linux/rculist.h>
  24#include <linux/skbuff.h>
  25#include <linux/slab.h>
  26#include <linux/timer.h>
  27#include <linux/inetdevice.h>
  28#include <net/ip.h>
  29#if IS_ENABLED(CONFIG_IPV6)
  30#include <net/ipv6.h>
  31#include <net/mld.h>
  32#include <net/ip6_checksum.h>
  33#include <net/addrconf.h>
 
  34#endif
  35
  36#include "br_private.h"
  37
  38static void br_multicast_start_querier(struct net_bridge *br,
  39				       struct bridge_mcast_own_query *query);
  40static void br_multicast_add_router(struct net_bridge *br,
  41				    struct net_bridge_port *port);
  42static void br_ip4_multicast_leave_group(struct net_bridge *br,
  43					 struct net_bridge_port *port,
  44					 __be32 group,
  45					 __u16 vid);
  46#if IS_ENABLED(CONFIG_IPV6)
  47static void br_ip6_multicast_leave_group(struct net_bridge *br,
  48					 struct net_bridge_port *port,
  49					 const struct in6_addr *group,
  50					 __u16 vid);
 
 
  51#endif
  52unsigned int br_mdb_rehash_seq;
  53
  54static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
  55{
  56	if (a->proto != b->proto)
  57		return 0;
  58	if (a->vid != b->vid)
  59		return 0;
  60	switch (a->proto) {
  61	case htons(ETH_P_IP):
  62		return a->u.ip4 == b->u.ip4;
  63#if IS_ENABLED(CONFIG_IPV6)
  64	case htons(ETH_P_IPV6):
  65		return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
  66#endif
  67	}
  68	return 0;
  69}
  70
  71static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
  72				__u16 vid)
  73{
  74	return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
  75}
  76
  77#if IS_ENABLED(CONFIG_IPV6)
  78static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
  79				const struct in6_addr *ip,
  80				__u16 vid)
  81{
  82	return jhash_2words(ipv6_addr_hash(ip), vid,
  83			    mdb->secret) & (mdb->max - 1);
  84}
  85#endif
  86
  87static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
  88			     struct br_ip *ip)
  89{
  90	switch (ip->proto) {
  91	case htons(ETH_P_IP):
  92		return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
  93#if IS_ENABLED(CONFIG_IPV6)
  94	case htons(ETH_P_IPV6):
  95		return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
  96#endif
  97	}
  98	return 0;
  99}
 100
 101static struct net_bridge_mdb_entry *__br_mdb_ip_get(
 102	struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
 103{
 104	struct net_bridge_mdb_entry *mp;
 
 105
 106	hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
 107		if (br_ip_equal(&mp->addr, dst))
 108			return mp;
 109	}
 110
 111	return NULL;
 112}
 113
 114struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
 115					   struct br_ip *dst)
 116{
 117	if (!mdb)
 118		return NULL;
 119
 120	return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
 121}
 122
 123static struct net_bridge_mdb_entry *br_mdb_ip4_get(
 124	struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
 125{
 126	struct br_ip br_dst;
 127
 128	br_dst.u.ip4 = dst;
 129	br_dst.proto = htons(ETH_P_IP);
 130	br_dst.vid = vid;
 131
 132	return br_mdb_ip_get(mdb, &br_dst);
 133}
 134
 135#if IS_ENABLED(CONFIG_IPV6)
 136static struct net_bridge_mdb_entry *br_mdb_ip6_get(
 137	struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
 138	__u16 vid)
 139{
 140	struct br_ip br_dst;
 141
 142	br_dst.u.ip6 = *dst;
 143	br_dst.proto = htons(ETH_P_IPV6);
 144	br_dst.vid = vid;
 145
 146	return br_mdb_ip_get(mdb, &br_dst);
 147}
 148#endif
 149
 150struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 151					struct sk_buff *skb, u16 vid)
 152{
 153	struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
 154	struct br_ip ip;
 155
 156	if (br->multicast_disabled)
 157		return NULL;
 158
 159	if (BR_INPUT_SKB_CB(skb)->igmp)
 160		return NULL;
 161
 162	ip.proto = skb->protocol;
 163	ip.vid = vid;
 164
 165	switch (skb->protocol) {
 166	case htons(ETH_P_IP):
 167		ip.u.ip4 = ip_hdr(skb)->daddr;
 168		break;
 169#if IS_ENABLED(CONFIG_IPV6)
 170	case htons(ETH_P_IPV6):
 171		ip.u.ip6 = ipv6_hdr(skb)->daddr;
 172		break;
 173#endif
 174	default:
 175		return NULL;
 176	}
 177
 178	return br_mdb_ip_get(mdb, &ip);
 179}
 180
 181static void br_mdb_free(struct rcu_head *head)
 182{
 183	struct net_bridge_mdb_htable *mdb =
 184		container_of(head, struct net_bridge_mdb_htable, rcu);
 185	struct net_bridge_mdb_htable *old = mdb->old;
 186
 187	mdb->old = NULL;
 188	kfree(old->mhash);
 189	kfree(old);
 190}
 191
 192static int br_mdb_copy(struct net_bridge_mdb_htable *new,
 193		       struct net_bridge_mdb_htable *old,
 194		       int elasticity)
 195{
 196	struct net_bridge_mdb_entry *mp;
 
 197	int maxlen;
 198	int len;
 199	int i;
 200
 201	for (i = 0; i < old->max; i++)
 202		hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
 203			hlist_add_head(&mp->hlist[new->ver],
 204				       &new->mhash[br_ip_hash(new, &mp->addr)]);
 205
 206	if (!elasticity)
 207		return 0;
 208
 209	maxlen = 0;
 210	for (i = 0; i < new->max; i++) {
 211		len = 0;
 212		hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
 213			len++;
 214		if (len > maxlen)
 215			maxlen = len;
 216	}
 217
 218	return maxlen > elasticity ? -EINVAL : 0;
 219}
 220
 221void br_multicast_free_pg(struct rcu_head *head)
 222{
 223	struct net_bridge_port_group *p =
 224		container_of(head, struct net_bridge_port_group, rcu);
 225
 226	kfree(p);
 227}
 228
 229static void br_multicast_free_group(struct rcu_head *head)
 230{
 231	struct net_bridge_mdb_entry *mp =
 232		container_of(head, struct net_bridge_mdb_entry, rcu);
 233
 234	kfree(mp);
 235}
 236
 237static void br_multicast_group_expired(unsigned long data)
 238{
 239	struct net_bridge_mdb_entry *mp = (void *)data;
 240	struct net_bridge *br = mp->br;
 241	struct net_bridge_mdb_htable *mdb;
 242
 243	spin_lock(&br->multicast_lock);
 244	if (!netif_running(br->dev) || timer_pending(&mp->timer))
 245		goto out;
 246
 247	mp->mglist = false;
 248
 249	if (mp->ports)
 250		goto out;
 251
 252	mdb = mlock_dereference(br->mdb, br);
 253
 254	hlist_del_rcu(&mp->hlist[mdb->ver]);
 255	mdb->size--;
 256
 257	call_rcu_bh(&mp->rcu, br_multicast_free_group);
 258
 259out:
 260	spin_unlock(&br->multicast_lock);
 261}
 262
 263static void br_multicast_del_pg(struct net_bridge *br,
 264				struct net_bridge_port_group *pg)
 265{
 266	struct net_bridge_mdb_htable *mdb;
 267	struct net_bridge_mdb_entry *mp;
 268	struct net_bridge_port_group *p;
 269	struct net_bridge_port_group __rcu **pp;
 270
 271	mdb = mlock_dereference(br->mdb, br);
 272
 273	mp = br_mdb_ip_get(mdb, &pg->addr);
 274	if (WARN_ON(!mp))
 275		return;
 276
 277	for (pp = &mp->ports;
 278	     (p = mlock_dereference(*pp, br)) != NULL;
 279	     pp = &p->next) {
 280		if (p != pg)
 281			continue;
 282
 283		rcu_assign_pointer(*pp, p->next);
 284		hlist_del_init(&p->mglist);
 285		del_timer(&p->timer);
 286		br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
 287			      p->flags);
 288		call_rcu_bh(&p->rcu, br_multicast_free_pg);
 289
 290		if (!mp->ports && !mp->mglist &&
 291		    netif_running(br->dev))
 292			mod_timer(&mp->timer, jiffies);
 293
 294		return;
 295	}
 296
 297	WARN_ON(1);
 298}
 299
 300static void br_multicast_port_group_expired(unsigned long data)
 301{
 302	struct net_bridge_port_group *pg = (void *)data;
 303	struct net_bridge *br = pg->port->br;
 304
 305	spin_lock(&br->multicast_lock);
 306	if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
 307	    hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
 308		goto out;
 309
 310	br_multicast_del_pg(br, pg);
 311
 312out:
 313	spin_unlock(&br->multicast_lock);
 314}
 315
 316static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
 317			 int elasticity)
 318{
 319	struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
 320	struct net_bridge_mdb_htable *mdb;
 321	int err;
 322
 323	mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
 324	if (!mdb)
 325		return -ENOMEM;
 326
 327	mdb->max = max;
 328	mdb->old = old;
 329
 330	mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
 331	if (!mdb->mhash) {
 332		kfree(mdb);
 333		return -ENOMEM;
 334	}
 335
 336	mdb->size = old ? old->size : 0;
 337	mdb->ver = old ? old->ver ^ 1 : 0;
 338
 339	if (!old || elasticity)
 340		get_random_bytes(&mdb->secret, sizeof(mdb->secret));
 341	else
 342		mdb->secret = old->secret;
 343
 344	if (!old)
 345		goto out;
 346
 347	err = br_mdb_copy(mdb, old, elasticity);
 348	if (err) {
 349		kfree(mdb->mhash);
 350		kfree(mdb);
 351		return err;
 352	}
 353
 354	br_mdb_rehash_seq++;
 355	call_rcu_bh(&mdb->rcu, br_mdb_free);
 356
 357out:
 358	rcu_assign_pointer(*mdbp, mdb);
 359
 360	return 0;
 361}
 362
 363static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
 364						    __be32 group)
 365{
 366	struct sk_buff *skb;
 367	struct igmphdr *ih;
 368	struct ethhdr *eth;
 369	struct iphdr *iph;
 370
 371	skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
 372						 sizeof(*ih) + 4);
 373	if (!skb)
 374		goto out;
 375
 376	skb->protocol = htons(ETH_P_IP);
 377
 378	skb_reset_mac_header(skb);
 379	eth = eth_hdr(skb);
 380
 381	ether_addr_copy(eth->h_source, br->dev->dev_addr);
 382	eth->h_dest[0] = 1;
 383	eth->h_dest[1] = 0;
 384	eth->h_dest[2] = 0x5e;
 385	eth->h_dest[3] = 0;
 386	eth->h_dest[4] = 0;
 387	eth->h_dest[5] = 1;
 388	eth->h_proto = htons(ETH_P_IP);
 389	skb_put(skb, sizeof(*eth));
 390
 391	skb_set_network_header(skb, skb->len);
 392	iph = ip_hdr(skb);
 393
 394	iph->version = 4;
 395	iph->ihl = 6;
 396	iph->tos = 0xc0;
 397	iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
 398	iph->id = 0;
 399	iph->frag_off = htons(IP_DF);
 400	iph->ttl = 1;
 401	iph->protocol = IPPROTO_IGMP;
 402	iph->saddr = br->multicast_query_use_ifaddr ?
 403		     inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
 404	iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
 405	((u8 *)&iph[1])[0] = IPOPT_RA;
 406	((u8 *)&iph[1])[1] = 4;
 407	((u8 *)&iph[1])[2] = 0;
 408	((u8 *)&iph[1])[3] = 0;
 409	ip_send_check(iph);
 410	skb_put(skb, 24);
 411
 412	skb_set_transport_header(skb, skb->len);
 413	ih = igmp_hdr(skb);
 414	ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
 415	ih->code = (group ? br->multicast_last_member_interval :
 416			    br->multicast_query_response_interval) /
 417		   (HZ / IGMP_TIMER_SCALE);
 418	ih->group = group;
 419	ih->csum = 0;
 420	ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 421	skb_put(skb, sizeof(*ih));
 422
 423	__skb_pull(skb, sizeof(*eth));
 424
 425out:
 426	return skb;
 427}
 428
 429#if IS_ENABLED(CONFIG_IPV6)
 430static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
 431						    const struct in6_addr *group)
 432{
 433	struct sk_buff *skb;
 434	struct ipv6hdr *ip6h;
 435	struct mld_msg *mldq;
 436	struct ethhdr *eth;
 437	u8 *hopopt;
 438	unsigned long interval;
 439
 440	skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
 441						 8 + sizeof(*mldq));
 442	if (!skb)
 443		goto out;
 444
 445	skb->protocol = htons(ETH_P_IPV6);
 446
 447	/* Ethernet header */
 448	skb_reset_mac_header(skb);
 449	eth = eth_hdr(skb);
 450
 451	ether_addr_copy(eth->h_source, br->dev->dev_addr);
 452	eth->h_proto = htons(ETH_P_IPV6);
 453	skb_put(skb, sizeof(*eth));
 454
 455	/* IPv6 header + HbH option */
 456	skb_set_network_header(skb, skb->len);
 457	ip6h = ipv6_hdr(skb);
 458
 459	*(__force __be32 *)ip6h = htonl(0x60000000);
 460	ip6h->payload_len = htons(8 + sizeof(*mldq));
 461	ip6h->nexthdr = IPPROTO_HOPOPTS;
 462	ip6h->hop_limit = 1;
 463	ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
 464	if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
 465			       &ip6h->saddr)) {
 466		kfree_skb(skb);
 467		return NULL;
 468	}
 469	ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
 470
 471	hopopt = (u8 *)(ip6h + 1);
 472	hopopt[0] = IPPROTO_ICMPV6;		/* next hdr */
 473	hopopt[1] = 0;				/* length of HbH */
 474	hopopt[2] = IPV6_TLV_ROUTERALERT;	/* Router Alert */
 475	hopopt[3] = 2;				/* Length of RA Option */
 476	hopopt[4] = 0;				/* Type = 0x0000 (MLD) */
 477	hopopt[5] = 0;
 478	hopopt[6] = IPV6_TLV_PAD1;		/* Pad1 */
 479	hopopt[7] = IPV6_TLV_PAD1;		/* Pad1 */
 480
 481	skb_put(skb, sizeof(*ip6h) + 8);
 482
 483	/* ICMPv6 */
 484	skb_set_transport_header(skb, skb->len);
 485	mldq = (struct mld_msg *) icmp6_hdr(skb);
 486
 487	interval = ipv6_addr_any(group) ?
 488			br->multicast_query_response_interval :
 489			br->multicast_last_member_interval;
 490
 491	mldq->mld_type = ICMPV6_MGM_QUERY;
 492	mldq->mld_code = 0;
 493	mldq->mld_cksum = 0;
 494	mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
 495	mldq->mld_reserved = 0;
 496	mldq->mld_mca = *group;
 497
 498	/* checksum */
 499	mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
 500					  sizeof(*mldq), IPPROTO_ICMPV6,
 501					  csum_partial(mldq,
 502						       sizeof(*mldq), 0));
 503	skb_put(skb, sizeof(*mldq));
 504
 505	__skb_pull(skb, sizeof(*eth));
 506
 507out:
 508	return skb;
 509}
 510#endif
 511
 512static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
 513						struct br_ip *addr)
 514{
 515	switch (addr->proto) {
 516	case htons(ETH_P_IP):
 517		return br_ip4_multicast_alloc_query(br, addr->u.ip4);
 518#if IS_ENABLED(CONFIG_IPV6)
 519	case htons(ETH_P_IPV6):
 520		return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
 521#endif
 522	}
 523	return NULL;
 524}
 525
 526static struct net_bridge_mdb_entry *br_multicast_get_group(
 527	struct net_bridge *br, struct net_bridge_port *port,
 528	struct br_ip *group, int hash)
 529{
 530	struct net_bridge_mdb_htable *mdb;
 531	struct net_bridge_mdb_entry *mp;
 
 532	unsigned int count = 0;
 533	unsigned int max;
 534	int elasticity;
 535	int err;
 536
 537	mdb = rcu_dereference_protected(br->mdb, 1);
 538	hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
 539		count++;
 540		if (unlikely(br_ip_equal(group, &mp->addr)))
 541			return mp;
 542	}
 543
 544	elasticity = 0;
 545	max = mdb->max;
 546
 547	if (unlikely(count > br->hash_elasticity && count)) {
 548		if (net_ratelimit())
 549			br_info(br, "Multicast hash table "
 550				"chain limit reached: %s\n",
 551				port ? port->dev->name : br->dev->name);
 552
 553		elasticity = br->hash_elasticity;
 554	}
 555
 556	if (mdb->size >= max) {
 557		max *= 2;
 558		if (unlikely(max > br->hash_max)) {
 559			br_warn(br, "Multicast hash table maximum of %d "
 560				"reached, disabling snooping: %s\n",
 561				br->hash_max,
 562				port ? port->dev->name : br->dev->name);
 563			err = -E2BIG;
 564disable:
 565			br->multicast_disabled = 1;
 566			goto err;
 567		}
 568	}
 569
 570	if (max > mdb->max || elasticity) {
 571		if (mdb->old) {
 572			if (net_ratelimit())
 573				br_info(br, "Multicast hash table "
 574					"on fire: %s\n",
 575					port ? port->dev->name : br->dev->name);
 576			err = -EEXIST;
 577			goto err;
 578		}
 579
 580		err = br_mdb_rehash(&br->mdb, max, elasticity);
 581		if (err) {
 582			br_warn(br, "Cannot rehash multicast "
 583				"hash table, disabling snooping: %s, %d, %d\n",
 584				port ? port->dev->name : br->dev->name,
 585				mdb->size, err);
 586			goto disable;
 587		}
 588
 589		err = -EAGAIN;
 590		goto err;
 591	}
 592
 593	return NULL;
 594
 595err:
 596	mp = ERR_PTR(err);
 597	return mp;
 598}
 599
 600struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
 601	struct net_bridge_port *port, struct br_ip *group)
 
 602{
 603	struct net_bridge_mdb_htable *mdb;
 604	struct net_bridge_mdb_entry *mp;
 605	int hash;
 606	int err;
 607
 608	mdb = rcu_dereference_protected(br->mdb, 1);
 609	if (!mdb) {
 610		err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
 611		if (err)
 612			return ERR_PTR(err);
 613		goto rehash;
 614	}
 615
 616	hash = br_ip_hash(mdb, group);
 617	mp = br_multicast_get_group(br, port, group, hash);
 618	switch (PTR_ERR(mp)) {
 619	case 0:
 620		break;
 621
 622	case -EAGAIN:
 623rehash:
 624		mdb = rcu_dereference_protected(br->mdb, 1);
 625		hash = br_ip_hash(mdb, group);
 626		break;
 627
 628	default:
 629		goto out;
 630	}
 631
 632	mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
 633	if (unlikely(!mp))
 634		return ERR_PTR(-ENOMEM);
 635
 636	mp->br = br;
 637	mp->addr = *group;
 638	setup_timer(&mp->timer, br_multicast_group_expired,
 639		    (unsigned long)mp);
 640
 641	hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
 642	mdb->size++;
 643
 644out:
 645	return mp;
 646}
 647
 648struct net_bridge_port_group *br_multicast_new_port_group(
 649			struct net_bridge_port *port,
 650			struct br_ip *group,
 651			struct net_bridge_port_group __rcu *next,
 652			unsigned char flags)
 653{
 654	struct net_bridge_port_group *p;
 655
 656	p = kzalloc(sizeof(*p), GFP_ATOMIC);
 657	if (unlikely(!p))
 658		return NULL;
 659
 660	p->addr = *group;
 661	p->port = port;
 662	p->flags = flags;
 663	rcu_assign_pointer(p->next, next);
 664	hlist_add_head(&p->mglist, &port->mglist);
 665	setup_timer(&p->timer, br_multicast_port_group_expired,
 666		    (unsigned long)p);
 667	return p;
 668}
 669
 670static int br_multicast_add_group(struct net_bridge *br,
 671				  struct net_bridge_port *port,
 672				  struct br_ip *group)
 673{
 674	struct net_bridge_mdb_entry *mp;
 675	struct net_bridge_port_group *p;
 676	struct net_bridge_port_group __rcu **pp;
 677	unsigned long now = jiffies;
 678	int err;
 679
 680	spin_lock(&br->multicast_lock);
 681	if (!netif_running(br->dev) ||
 682	    (port && port->state == BR_STATE_DISABLED))
 683		goto out;
 684
 685	mp = br_multicast_new_group(br, port, group);
 686	err = PTR_ERR(mp);
 687	if (IS_ERR(mp))
 688		goto err;
 689
 690	if (!port) {
 691		mp->mglist = true;
 692		mod_timer(&mp->timer, now + br->multicast_membership_interval);
 693		goto out;
 694	}
 695
 696	for (pp = &mp->ports;
 697	     (p = mlock_dereference(*pp, br)) != NULL;
 698	     pp = &p->next) {
 699		if (p->port == port)
 700			goto found;
 701		if ((unsigned long)p->port < (unsigned long)port)
 702			break;
 703	}
 704
 705	p = br_multicast_new_port_group(port, group, *pp, 0);
 
 706	if (unlikely(!p))
 707		goto err;
 
 
 
 
 
 
 
 
 708	rcu_assign_pointer(*pp, p);
 709	br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
 710
 711found:
 712	mod_timer(&p->timer, now + br->multicast_membership_interval);
 713out:
 714	err = 0;
 715
 716err:
 717	spin_unlock(&br->multicast_lock);
 718	return err;
 719}
 720
 721static int br_ip4_multicast_add_group(struct net_bridge *br,
 722				      struct net_bridge_port *port,
 723				      __be32 group,
 724				      __u16 vid)
 725{
 726	struct br_ip br_group;
 727
 728	if (ipv4_is_local_multicast(group))
 729		return 0;
 730
 731	br_group.u.ip4 = group;
 732	br_group.proto = htons(ETH_P_IP);
 733	br_group.vid = vid;
 734
 735	return br_multicast_add_group(br, port, &br_group);
 736}
 737
 738#if IS_ENABLED(CONFIG_IPV6)
 739static int br_ip6_multicast_add_group(struct net_bridge *br,
 740				      struct net_bridge_port *port,
 741				      const struct in6_addr *group,
 742				      __u16 vid)
 743{
 744	struct br_ip br_group;
 745
 746	if (ipv6_addr_is_ll_all_nodes(group))
 747		return 0;
 748
 749	br_group.u.ip6 = *group;
 750	br_group.proto = htons(ETH_P_IPV6);
 751	br_group.vid = vid;
 752
 753	return br_multicast_add_group(br, port, &br_group);
 754}
 755#endif
 756
 757static void br_multicast_router_expired(unsigned long data)
 758{
 759	struct net_bridge_port *port = (void *)data;
 760	struct net_bridge *br = port->br;
 761
 762	spin_lock(&br->multicast_lock);
 763	if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
 764	    port->multicast_router == MDB_RTR_TYPE_PERM ||
 765	    timer_pending(&port->multicast_router_timer) ||
 766	    hlist_unhashed(&port->rlist))
 767		goto out;
 768
 769	hlist_del_init_rcu(&port->rlist);
 770	br_rtr_notify(br->dev, port, RTM_DELMDB);
 771	/* Don't allow timer refresh if the router expired */
 772	if (port->multicast_router == MDB_RTR_TYPE_TEMP)
 773		port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
 774
 775out:
 776	spin_unlock(&br->multicast_lock);
 777}
 778
 779static void br_multicast_local_router_expired(unsigned long data)
 780{
 781}
 782
 783static void br_multicast_querier_expired(struct net_bridge *br,
 784					 struct bridge_mcast_own_query *query)
 785{
 
 
 786	spin_lock(&br->multicast_lock);
 787	if (!netif_running(br->dev) || br->multicast_disabled)
 788		goto out;
 789
 790	br_multicast_start_querier(br, query);
 791
 792out:
 793	spin_unlock(&br->multicast_lock);
 794}
 795
 796static void br_ip4_multicast_querier_expired(unsigned long data)
 797{
 798	struct net_bridge *br = (void *)data;
 799
 800	br_multicast_querier_expired(br, &br->ip4_own_query);
 801}
 802
 803#if IS_ENABLED(CONFIG_IPV6)
 804static void br_ip6_multicast_querier_expired(unsigned long data)
 805{
 806	struct net_bridge *br = (void *)data;
 807
 808	br_multicast_querier_expired(br, &br->ip6_own_query);
 809}
 810#endif
 811
 812static void br_multicast_select_own_querier(struct net_bridge *br,
 813					    struct br_ip *ip,
 814					    struct sk_buff *skb)
 815{
 816	if (ip->proto == htons(ETH_P_IP))
 817		br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
 818#if IS_ENABLED(CONFIG_IPV6)
 819	else
 820		br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
 821#endif
 822}
 823
 824static void __br_multicast_send_query(struct net_bridge *br,
 825				      struct net_bridge_port *port,
 826				      struct br_ip *ip)
 827{
 828	struct sk_buff *skb;
 829
 830	skb = br_multicast_alloc_query(br, ip);
 831	if (!skb)
 832		return;
 833
 834	if (port) {
 
 835		skb->dev = port->dev;
 836		NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
 837			dev_net(port->dev), NULL, skb, NULL, skb->dev,
 838			br_dev_queue_push_xmit);
 839	} else {
 840		br_multicast_select_own_querier(br, ip, skb);
 841		netif_rx(skb);
 842	}
 843}
 844
 845static void br_multicast_send_query(struct net_bridge *br,
 846				    struct net_bridge_port *port,
 847				    struct bridge_mcast_own_query *own_query)
 848{
 849	unsigned long time;
 850	struct br_ip br_group;
 851	struct bridge_mcast_other_query *other_query = NULL;
 852
 853	if (!netif_running(br->dev) || br->multicast_disabled ||
 854	    !br->multicast_querier)
 
 855		return;
 856
 857	memset(&br_group.u, 0, sizeof(br_group.u));
 858
 859	if (port ? (own_query == &port->ip4_own_query) :
 860		   (own_query == &br->ip4_own_query)) {
 861		other_query = &br->ip4_other_query;
 862		br_group.proto = htons(ETH_P_IP);
 863#if IS_ENABLED(CONFIG_IPV6)
 864	} else {
 865		other_query = &br->ip6_other_query;
 866		br_group.proto = htons(ETH_P_IPV6);
 867#endif
 868	}
 869
 870	if (!other_query || timer_pending(&other_query->timer))
 871		return;
 872
 
 
 873	__br_multicast_send_query(br, port, &br_group);
 
 874
 875	time = jiffies;
 876	time += own_query->startup_sent < br->multicast_startup_query_count ?
 877		br->multicast_startup_query_interval :
 878		br->multicast_query_interval;
 879	mod_timer(&own_query->timer, time);
 
 880}
 881
 882static void
 883br_multicast_port_query_expired(struct net_bridge_port *port,
 884				struct bridge_mcast_own_query *query)
 885{
 
 886	struct net_bridge *br = port->br;
 887
 888	spin_lock(&br->multicast_lock);
 889	if (port->state == BR_STATE_DISABLED ||
 890	    port->state == BR_STATE_BLOCKING)
 891		goto out;
 892
 893	if (query->startup_sent < br->multicast_startup_query_count)
 894		query->startup_sent++;
 
 895
 896	br_multicast_send_query(port->br, port, query);
 
 897
 898out:
 899	spin_unlock(&br->multicast_lock);
 900}
 901
 902static void br_ip4_multicast_port_query_expired(unsigned long data)
 903{
 904	struct net_bridge_port *port = (void *)data;
 905
 906	br_multicast_port_query_expired(port, &port->ip4_own_query);
 907}
 908
 909#if IS_ENABLED(CONFIG_IPV6)
 910static void br_ip6_multicast_port_query_expired(unsigned long data)
 911{
 912	struct net_bridge_port *port = (void *)data;
 913
 914	br_multicast_port_query_expired(port, &port->ip6_own_query);
 915}
 916#endif
 917
 918void br_multicast_add_port(struct net_bridge_port *port)
 919{
 920	port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
 921
 922	setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
 923		    (unsigned long)port);
 924	setup_timer(&port->ip4_own_query.timer,
 925		    br_ip4_multicast_port_query_expired, (unsigned long)port);
 926#if IS_ENABLED(CONFIG_IPV6)
 927	setup_timer(&port->ip6_own_query.timer,
 928		    br_ip6_multicast_port_query_expired, (unsigned long)port);
 929#endif
 930}
 931
 932void br_multicast_del_port(struct net_bridge_port *port)
 933{
 934	struct net_bridge *br = port->br;
 935	struct net_bridge_port_group *pg;
 936	struct hlist_node *n;
 937
 938	/* Take care of the remaining groups, only perm ones should be left */
 939	spin_lock_bh(&br->multicast_lock);
 940	hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
 941		br_multicast_del_pg(br, pg);
 942	spin_unlock_bh(&br->multicast_lock);
 943	del_timer_sync(&port->multicast_router_timer);
 944}
 945
 946static void br_multicast_enable(struct bridge_mcast_own_query *query)
 947{
 948	query->startup_sent = 0;
 949
 950	if (try_to_del_timer_sync(&query->timer) >= 0 ||
 951	    del_timer(&query->timer))
 952		mod_timer(&query->timer, jiffies);
 953}
 954
 955void br_multicast_enable_port(struct net_bridge_port *port)
 956{
 957	struct net_bridge *br = port->br;
 958
 959	spin_lock(&br->multicast_lock);
 960	if (br->multicast_disabled || !netif_running(br->dev))
 961		goto out;
 962
 963	br_multicast_enable(&port->ip4_own_query);
 964#if IS_ENABLED(CONFIG_IPV6)
 965	br_multicast_enable(&port->ip6_own_query);
 966#endif
 967	if (port->multicast_router == MDB_RTR_TYPE_PERM &&
 968	    hlist_unhashed(&port->rlist))
 969		br_multicast_add_router(br, port);
 970
 971out:
 972	spin_unlock(&br->multicast_lock);
 973}
 974
 975void br_multicast_disable_port(struct net_bridge_port *port)
 976{
 977	struct net_bridge *br = port->br;
 978	struct net_bridge_port_group *pg;
 979	struct hlist_node *n;
 980
 981	spin_lock(&br->multicast_lock);
 982	hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
 983		if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
 984			br_multicast_del_pg(br, pg);
 985
 986	if (!hlist_unhashed(&port->rlist)) {
 987		hlist_del_init_rcu(&port->rlist);
 988		br_rtr_notify(br->dev, port, RTM_DELMDB);
 989		/* Don't allow timer refresh if disabling */
 990		if (port->multicast_router == MDB_RTR_TYPE_TEMP)
 991			port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
 992	}
 993	del_timer(&port->multicast_router_timer);
 994	del_timer(&port->ip4_own_query.timer);
 995#if IS_ENABLED(CONFIG_IPV6)
 996	del_timer(&port->ip6_own_query.timer);
 997#endif
 998	spin_unlock(&br->multicast_lock);
 999}
1000
1001static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1002					 struct net_bridge_port *port,
1003					 struct sk_buff *skb,
1004					 u16 vid)
1005{
1006	struct igmpv3_report *ih;
1007	struct igmpv3_grec *grec;
1008	int i;
1009	int len;
1010	int num;
1011	int type;
1012	int err = 0;
1013	__be32 group;
1014
 
 
 
1015	ih = igmpv3_report_hdr(skb);
1016	num = ntohs(ih->ngrec);
1017	len = skb_transport_offset(skb) + sizeof(*ih);
1018
1019	for (i = 0; i < num; i++) {
1020		len += sizeof(*grec);
1021		if (!pskb_may_pull(skb, len))
1022			return -EINVAL;
1023
1024		grec = (void *)(skb->data + len - sizeof(*grec));
1025		group = grec->grec_mca;
1026		type = grec->grec_type;
1027
1028		len += ntohs(grec->grec_nsrcs) * 4;
1029		if (!pskb_may_pull(skb, len))
1030			return -EINVAL;
1031
1032		/* We treat this as an IGMPv2 report for now. */
1033		switch (type) {
1034		case IGMPV3_MODE_IS_INCLUDE:
1035		case IGMPV3_MODE_IS_EXCLUDE:
1036		case IGMPV3_CHANGE_TO_INCLUDE:
1037		case IGMPV3_CHANGE_TO_EXCLUDE:
1038		case IGMPV3_ALLOW_NEW_SOURCES:
1039		case IGMPV3_BLOCK_OLD_SOURCES:
1040			break;
1041
1042		default:
1043			continue;
1044		}
1045
1046		if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1047		     type == IGMPV3_MODE_IS_INCLUDE) &&
1048		    ntohs(grec->grec_nsrcs) == 0) {
1049			br_ip4_multicast_leave_group(br, port, group, vid);
1050		} else {
1051			err = br_ip4_multicast_add_group(br, port, group, vid);
1052			if (err)
1053				break;
1054		}
1055	}
1056
1057	return err;
1058}
1059
1060#if IS_ENABLED(CONFIG_IPV6)
1061static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1062					struct net_bridge_port *port,
1063					struct sk_buff *skb,
1064					u16 vid)
1065{
1066	struct icmp6hdr *icmp6h;
1067	struct mld2_grec *grec;
1068	int i;
1069	int len;
1070	int num;
1071	int err = 0;
1072
1073	if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1074		return -EINVAL;
1075
1076	icmp6h = icmp6_hdr(skb);
1077	num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1078	len = skb_transport_offset(skb) + sizeof(*icmp6h);
1079
1080	for (i = 0; i < num; i++) {
1081		__be16 *nsrcs, _nsrcs;
1082
1083		nsrcs = skb_header_pointer(skb,
1084					   len + offsetof(struct mld2_grec,
1085							  grec_nsrcs),
1086					   sizeof(_nsrcs), &_nsrcs);
1087		if (!nsrcs)
1088			return -EINVAL;
1089
1090		if (!pskb_may_pull(skb,
1091				   len + sizeof(*grec) +
1092				   sizeof(struct in6_addr) * ntohs(*nsrcs)))
1093			return -EINVAL;
1094
1095		grec = (struct mld2_grec *)(skb->data + len);
1096		len += sizeof(*grec) +
1097		       sizeof(struct in6_addr) * ntohs(*nsrcs);
1098
1099		/* We treat these as MLDv1 reports for now. */
1100		switch (grec->grec_type) {
1101		case MLD2_MODE_IS_INCLUDE:
1102		case MLD2_MODE_IS_EXCLUDE:
1103		case MLD2_CHANGE_TO_INCLUDE:
1104		case MLD2_CHANGE_TO_EXCLUDE:
1105		case MLD2_ALLOW_NEW_SOURCES:
1106		case MLD2_BLOCK_OLD_SOURCES:
1107			break;
1108
1109		default:
1110			continue;
1111		}
1112
1113		if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1114		     grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1115		    ntohs(*nsrcs) == 0) {
1116			br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1117						     vid);
1118		} else {
1119			err = br_ip6_multicast_add_group(br, port,
1120							 &grec->grec_mca, vid);
1121			if (!err)
1122				break;
1123		}
1124	}
1125
1126	return err;
1127}
1128#endif
1129
1130static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1131					    struct net_bridge_port *port,
1132					    __be32 saddr)
1133{
1134	if (!timer_pending(&br->ip4_own_query.timer) &&
1135	    !timer_pending(&br->ip4_other_query.timer))
1136		goto update;
1137
1138	if (!br->ip4_querier.addr.u.ip4)
1139		goto update;
1140
1141	if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1142		goto update;
1143
1144	return false;
1145
1146update:
1147	br->ip4_querier.addr.u.ip4 = saddr;
1148
1149	/* update protected by general multicast_lock by caller */
1150	rcu_assign_pointer(br->ip4_querier.port, port);
1151
1152	return true;
1153}
1154
1155#if IS_ENABLED(CONFIG_IPV6)
1156static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1157					    struct net_bridge_port *port,
1158					    struct in6_addr *saddr)
1159{
1160	if (!timer_pending(&br->ip6_own_query.timer) &&
1161	    !timer_pending(&br->ip6_other_query.timer))
1162		goto update;
1163
1164	if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1165		goto update;
1166
1167	return false;
1168
1169update:
1170	br->ip6_querier.addr.u.ip6 = *saddr;
1171
1172	/* update protected by general multicast_lock by caller */
1173	rcu_assign_pointer(br->ip6_querier.port, port);
1174
1175	return true;
1176}
1177#endif
1178
1179static bool br_multicast_select_querier(struct net_bridge *br,
1180					struct net_bridge_port *port,
1181					struct br_ip *saddr)
1182{
1183	switch (saddr->proto) {
1184	case htons(ETH_P_IP):
1185		return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1186#if IS_ENABLED(CONFIG_IPV6)
1187	case htons(ETH_P_IPV6):
1188		return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1189#endif
1190	}
1191
1192	return false;
1193}
1194
1195static void
1196br_multicast_update_query_timer(struct net_bridge *br,
1197				struct bridge_mcast_other_query *query,
1198				unsigned long max_delay)
1199{
1200	if (!timer_pending(&query->timer))
1201		query->delay_time = jiffies + max_delay;
1202
1203	mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1204}
1205
1206/*
1207 * Add port to router_list
1208 *  list is maintained ordered by pointer value
1209 *  and locked by br->multicast_lock and RCU
1210 */
1211static void br_multicast_add_router(struct net_bridge *br,
1212				    struct net_bridge_port *port)
1213{
1214	struct net_bridge_port *p;
1215	struct hlist_node *slot = NULL;
1216
1217	if (!hlist_unhashed(&port->rlist))
1218		return;
1219
1220	hlist_for_each_entry(p, &br->router_list, rlist) {
1221		if ((unsigned long) port >= (unsigned long) p)
1222			break;
1223		slot = &p->rlist;
1224	}
1225
1226	if (slot)
1227		hlist_add_behind_rcu(&port->rlist, slot);
1228	else
1229		hlist_add_head_rcu(&port->rlist, &br->router_list);
1230	br_rtr_notify(br->dev, port, RTM_NEWMDB);
1231}
1232
1233static void br_multicast_mark_router(struct net_bridge *br,
1234				     struct net_bridge_port *port)
1235{
1236	unsigned long now = jiffies;
1237
1238	if (!port) {
1239		if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY)
1240			mod_timer(&br->multicast_router_timer,
1241				  now + br->multicast_querier_interval);
1242		return;
1243	}
1244
1245	if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1246	    port->multicast_router == MDB_RTR_TYPE_PERM)
1247		return;
1248
 
 
 
1249	br_multicast_add_router(br, port);
1250
 
1251	mod_timer(&port->multicast_router_timer,
1252		  now + br->multicast_querier_interval);
1253}
1254
1255static void br_multicast_query_received(struct net_bridge *br,
1256					struct net_bridge_port *port,
1257					struct bridge_mcast_other_query *query,
1258					struct br_ip *saddr,
1259					unsigned long max_delay)
1260{
1261	if (!br_multicast_select_querier(br, port, saddr))
 
 
 
1262		return;
1263
1264	br_multicast_update_query_timer(br, query, max_delay);
1265	br_multicast_mark_router(br, port);
1266}
1267
1268static int br_ip4_multicast_query(struct net_bridge *br,
1269				  struct net_bridge_port *port,
1270				  struct sk_buff *skb,
1271				  u16 vid)
1272{
1273	const struct iphdr *iph = ip_hdr(skb);
1274	struct igmphdr *ih = igmp_hdr(skb);
1275	struct net_bridge_mdb_entry *mp;
1276	struct igmpv3_query *ih3;
1277	struct net_bridge_port_group *p;
1278	struct net_bridge_port_group __rcu **pp;
1279	struct br_ip saddr;
1280	unsigned long max_delay;
1281	unsigned long now = jiffies;
1282	unsigned int offset = skb_transport_offset(skb);
1283	__be32 group;
1284	int err = 0;
1285
1286	spin_lock(&br->multicast_lock);
1287	if (!netif_running(br->dev) ||
1288	    (port && port->state == BR_STATE_DISABLED))
1289		goto out;
1290
 
 
1291	group = ih->group;
1292
1293	if (skb->len == offset + sizeof(*ih)) {
1294		max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1295
1296		if (!max_delay) {
1297			max_delay = 10 * HZ;
1298			group = 0;
1299		}
1300	} else if (skb->len >= offset + sizeof(*ih3)) {
 
 
 
 
 
1301		ih3 = igmpv3_query_hdr(skb);
1302		if (ih3->nsrcs)
1303			goto out;
1304
1305		max_delay = ih3->code ?
1306			    IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1307	} else {
1308		goto out;
1309	}
1310
1311	if (!group) {
1312		saddr.proto = htons(ETH_P_IP);
1313		saddr.u.ip4 = iph->saddr;
1314
1315		br_multicast_query_received(br, port, &br->ip4_other_query,
1316					    &saddr, max_delay);
1317		goto out;
1318	}
1319
1320	mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1321	if (!mp)
1322		goto out;
1323
1324	max_delay *= br->multicast_last_member_count;
1325
1326	if (mp->mglist &&
1327	    (timer_pending(&mp->timer) ?
1328	     time_after(mp->timer.expires, now + max_delay) :
1329	     try_to_del_timer_sync(&mp->timer) >= 0))
1330		mod_timer(&mp->timer, now + max_delay);
1331
1332	for (pp = &mp->ports;
1333	     (p = mlock_dereference(*pp, br)) != NULL;
1334	     pp = &p->next) {
1335		if (timer_pending(&p->timer) ?
1336		    time_after(p->timer.expires, now + max_delay) :
1337		    try_to_del_timer_sync(&p->timer) >= 0)
1338			mod_timer(&p->timer, now + max_delay);
1339	}
1340
1341out:
1342	spin_unlock(&br->multicast_lock);
1343	return err;
1344}
1345
1346#if IS_ENABLED(CONFIG_IPV6)
1347static int br_ip6_multicast_query(struct net_bridge *br,
1348				  struct net_bridge_port *port,
1349				  struct sk_buff *skb,
1350				  u16 vid)
1351{
1352	const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1353	struct mld_msg *mld;
1354	struct net_bridge_mdb_entry *mp;
1355	struct mld2_query *mld2q;
1356	struct net_bridge_port_group *p;
1357	struct net_bridge_port_group __rcu **pp;
1358	struct br_ip saddr;
1359	unsigned long max_delay;
1360	unsigned long now = jiffies;
1361	unsigned int offset = skb_transport_offset(skb);
1362	const struct in6_addr *group = NULL;
1363	bool is_general_query;
1364	int err = 0;
1365
1366	spin_lock(&br->multicast_lock);
1367	if (!netif_running(br->dev) ||
1368	    (port && port->state == BR_STATE_DISABLED))
1369		goto out;
1370
1371	if (skb->len == offset + sizeof(*mld)) {
1372		if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
 
 
1373			err = -EINVAL;
1374			goto out;
1375		}
1376		mld = (struct mld_msg *) icmp6_hdr(skb);
1377		max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1378		if (max_delay)
1379			group = &mld->mld_mca;
1380	} else {
1381		if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1382			err = -EINVAL;
1383			goto out;
1384		}
1385		mld2q = (struct mld2_query *)icmp6_hdr(skb);
1386		if (!mld2q->mld2q_nsrcs)
1387			group = &mld2q->mld2q_mca;
1388
1389		max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1390	}
1391
1392	is_general_query = group && ipv6_addr_any(group);
1393
1394	if (is_general_query) {
1395		saddr.proto = htons(ETH_P_IPV6);
1396		saddr.u.ip6 = ip6h->saddr;
1397
1398		br_multicast_query_received(br, port, &br->ip6_other_query,
1399					    &saddr, max_delay);
1400		goto out;
1401	} else if (!group) {
1402		goto out;
1403	}
1404
1405	mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1406	if (!mp)
1407		goto out;
1408
1409	max_delay *= br->multicast_last_member_count;
1410	if (mp->mglist &&
1411	    (timer_pending(&mp->timer) ?
1412	     time_after(mp->timer.expires, now + max_delay) :
1413	     try_to_del_timer_sync(&mp->timer) >= 0))
1414		mod_timer(&mp->timer, now + max_delay);
1415
1416	for (pp = &mp->ports;
1417	     (p = mlock_dereference(*pp, br)) != NULL;
1418	     pp = &p->next) {
1419		if (timer_pending(&p->timer) ?
1420		    time_after(p->timer.expires, now + max_delay) :
1421		    try_to_del_timer_sync(&p->timer) >= 0)
1422			mod_timer(&p->timer, now + max_delay);
1423	}
1424
1425out:
1426	spin_unlock(&br->multicast_lock);
1427	return err;
1428}
1429#endif
1430
1431static void
1432br_multicast_leave_group(struct net_bridge *br,
1433			 struct net_bridge_port *port,
1434			 struct br_ip *group,
1435			 struct bridge_mcast_other_query *other_query,
1436			 struct bridge_mcast_own_query *own_query)
1437{
1438	struct net_bridge_mdb_htable *mdb;
1439	struct net_bridge_mdb_entry *mp;
1440	struct net_bridge_port_group *p;
1441	unsigned long now;
1442	unsigned long time;
1443
1444	spin_lock(&br->multicast_lock);
1445	if (!netif_running(br->dev) ||
1446	    (port && port->state == BR_STATE_DISABLED))
 
1447		goto out;
1448
1449	mdb = mlock_dereference(br->mdb, br);
1450	mp = br_mdb_ip_get(mdb, group);
1451	if (!mp)
1452		goto out;
1453
1454	if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1455		struct net_bridge_port_group __rcu **pp;
1456
1457		for (pp = &mp->ports;
1458		     (p = mlock_dereference(*pp, br)) != NULL;
1459		     pp = &p->next) {
1460			if (p->port != port)
1461				continue;
1462
1463			rcu_assign_pointer(*pp, p->next);
1464			hlist_del_init(&p->mglist);
1465			del_timer(&p->timer);
1466			call_rcu_bh(&p->rcu, br_multicast_free_pg);
1467			br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1468				      p->flags);
1469
1470			if (!mp->ports && !mp->mglist &&
1471			    netif_running(br->dev))
1472				mod_timer(&mp->timer, jiffies);
1473		}
1474		goto out;
1475	}
1476
1477	if (timer_pending(&other_query->timer))
1478		goto out;
1479
1480	if (br->multicast_querier) {
1481		__br_multicast_send_query(br, port, &mp->addr);
1482
1483		time = jiffies + br->multicast_last_member_count *
1484				 br->multicast_last_member_interval;
1485
1486		mod_timer(&own_query->timer, time);
1487
1488		for (p = mlock_dereference(mp->ports, br);
1489		     p != NULL;
1490		     p = mlock_dereference(p->next, br)) {
1491			if (p->port != port)
1492				continue;
1493
1494			if (!hlist_unhashed(&p->mglist) &&
1495			    (timer_pending(&p->timer) ?
1496			     time_after(p->timer.expires, time) :
1497			     try_to_del_timer_sync(&p->timer) >= 0)) {
1498				mod_timer(&p->timer, time);
1499			}
1500
1501			break;
1502		}
1503	}
1504
1505	now = jiffies;
1506	time = now + br->multicast_last_member_count *
1507		     br->multicast_last_member_interval;
1508
1509	if (!port) {
1510		if (mp->mglist &&
1511		    (timer_pending(&mp->timer) ?
1512		     time_after(mp->timer.expires, time) :
1513		     try_to_del_timer_sync(&mp->timer) >= 0)) {
1514			mod_timer(&mp->timer, time);
1515		}
1516
1517		goto out;
1518	}
1519
1520	for (p = mlock_dereference(mp->ports, br);
1521	     p != NULL;
1522	     p = mlock_dereference(p->next, br)) {
1523		if (p->port != port)
1524			continue;
1525
1526		if (!hlist_unhashed(&p->mglist) &&
1527		    (timer_pending(&p->timer) ?
1528		     time_after(p->timer.expires, time) :
1529		     try_to_del_timer_sync(&p->timer) >= 0)) {
1530			mod_timer(&p->timer, time);
1531		}
1532
1533		break;
1534	}
 
1535out:
1536	spin_unlock(&br->multicast_lock);
1537}
1538
1539static void br_ip4_multicast_leave_group(struct net_bridge *br,
1540					 struct net_bridge_port *port,
1541					 __be32 group,
1542					 __u16 vid)
1543{
1544	struct br_ip br_group;
1545	struct bridge_mcast_own_query *own_query;
1546
1547	if (ipv4_is_local_multicast(group))
1548		return;
1549
1550	own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1551
1552	br_group.u.ip4 = group;
1553	br_group.proto = htons(ETH_P_IP);
1554	br_group.vid = vid;
1555
1556	br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1557				 own_query);
1558}
1559
1560#if IS_ENABLED(CONFIG_IPV6)
1561static void br_ip6_multicast_leave_group(struct net_bridge *br,
1562					 struct net_bridge_port *port,
1563					 const struct in6_addr *group,
1564					 __u16 vid)
1565{
1566	struct br_ip br_group;
1567	struct bridge_mcast_own_query *own_query;
1568
1569	if (ipv6_addr_is_ll_all_nodes(group))
1570		return;
1571
1572	own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1573
1574	br_group.u.ip6 = *group;
1575	br_group.proto = htons(ETH_P_IPV6);
1576	br_group.vid = vid;
1577
1578	br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1579				 own_query);
1580}
1581#endif
1582
1583static int br_multicast_ipv4_rcv(struct net_bridge *br,
1584				 struct net_bridge_port *port,
1585				 struct sk_buff *skb,
1586				 u16 vid)
1587{
1588	struct sk_buff *skb_trimmed = NULL;
 
1589	struct igmphdr *ih;
 
 
1590	int err;
1591
1592	err = ip_mc_check_igmp(skb, &skb_trimmed);
 
 
 
 
 
 
 
 
 
 
1593
1594	if (err == -ENOMSG) {
1595		if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
 
 
 
 
 
1596			BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1597		return 0;
1598	} else if (err < 0) {
1599		return err;
1600	}
1601
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1602	BR_INPUT_SKB_CB(skb)->igmp = 1;
1603	ih = igmp_hdr(skb);
1604
1605	switch (ih->type) {
1606	case IGMP_HOST_MEMBERSHIP_REPORT:
1607	case IGMPV2_HOST_MEMBERSHIP_REPORT:
1608		BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1609		err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1610		break;
1611	case IGMPV3_HOST_MEMBERSHIP_REPORT:
1612		err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1613		break;
1614	case IGMP_HOST_MEMBERSHIP_QUERY:
1615		err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1616		break;
1617	case IGMP_HOST_LEAVE_MESSAGE:
1618		br_ip4_multicast_leave_group(br, port, ih->group, vid);
1619		break;
1620	}
1621
1622	if (skb_trimmed && skb_trimmed != skb)
1623		kfree_skb(skb_trimmed);
1624
 
 
1625	return err;
1626}
1627
1628#if IS_ENABLED(CONFIG_IPV6)
1629static int br_multicast_ipv6_rcv(struct net_bridge *br,
1630				 struct net_bridge_port *port,
1631				 struct sk_buff *skb,
1632				 u16 vid)
1633{
1634	struct sk_buff *skb_trimmed = NULL;
1635	struct mld_msg *mld;
 
 
 
 
 
1636	int err;
1637
1638	err = ipv6_mc_check_mld(skb, &skb_trimmed);
 
1639
1640	if (err == -ENOMSG) {
1641		if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1642			BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
 
 
 
 
 
 
 
 
1643		return 0;
1644	} else if (err < 0) {
1645		return err;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1646	}
1647
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1648	BR_INPUT_SKB_CB(skb)->igmp = 1;
1649	mld = (struct mld_msg *)skb_transport_header(skb);
1650
1651	switch (mld->mld_type) {
1652	case ICMPV6_MGM_REPORT:
 
 
 
 
 
 
 
1653		BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1654		err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1655		break;
 
1656	case ICMPV6_MLD2_REPORT:
1657		err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1658		break;
1659	case ICMPV6_MGM_QUERY:
1660		err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1661		break;
1662	case ICMPV6_MGM_REDUCTION:
1663		br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1664		break;
 
 
 
 
 
 
 
1665	}
1666
1667	if (skb_trimmed && skb_trimmed != skb)
1668		kfree_skb(skb_trimmed);
1669
1670	return err;
1671}
1672#endif
1673
1674int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1675		     struct sk_buff *skb, u16 vid)
1676{
1677	BR_INPUT_SKB_CB(skb)->igmp = 0;
1678	BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1679
1680	if (br->multicast_disabled)
1681		return 0;
1682
1683	switch (skb->protocol) {
1684	case htons(ETH_P_IP):
1685		return br_multicast_ipv4_rcv(br, port, skb, vid);
1686#if IS_ENABLED(CONFIG_IPV6)
1687	case htons(ETH_P_IPV6):
1688		return br_multicast_ipv6_rcv(br, port, skb, vid);
1689#endif
1690	}
1691
1692	return 0;
1693}
1694
1695static void br_multicast_query_expired(struct net_bridge *br,
1696				       struct bridge_mcast_own_query *query,
1697				       struct bridge_mcast_querier *querier)
1698{
1699	spin_lock(&br->multicast_lock);
1700	if (query->startup_sent < br->multicast_startup_query_count)
1701		query->startup_sent++;
1702
1703	RCU_INIT_POINTER(querier->port, NULL);
1704	br_multicast_send_query(br, NULL, query);
1705	spin_unlock(&br->multicast_lock);
1706}
1707
1708static void br_ip4_multicast_query_expired(unsigned long data)
1709{
1710	struct net_bridge *br = (void *)data;
1711
1712	br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1713}
 
 
1714
1715#if IS_ENABLED(CONFIG_IPV6)
1716static void br_ip6_multicast_query_expired(unsigned long data)
1717{
1718	struct net_bridge *br = (void *)data;
1719
1720	br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1721}
1722#endif
1723
1724void br_multicast_init(struct net_bridge *br)
1725{
1726	br->hash_elasticity = 4;
1727	br->hash_max = 512;
1728
1729	br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1730	br->multicast_querier = 0;
1731	br->multicast_query_use_ifaddr = 0;
1732	br->multicast_last_member_count = 2;
1733	br->multicast_startup_query_count = 2;
1734
1735	br->multicast_last_member_interval = HZ;
1736	br->multicast_query_response_interval = 10 * HZ;
1737	br->multicast_startup_query_interval = 125 * HZ / 4;
1738	br->multicast_query_interval = 125 * HZ;
1739	br->multicast_querier_interval = 255 * HZ;
1740	br->multicast_membership_interval = 260 * HZ;
1741
1742	br->ip4_other_query.delay_time = 0;
1743	br->ip4_querier.port = NULL;
1744#if IS_ENABLED(CONFIG_IPV6)
1745	br->ip6_other_query.delay_time = 0;
1746	br->ip6_querier.port = NULL;
1747#endif
1748
1749	spin_lock_init(&br->multicast_lock);
1750	setup_timer(&br->multicast_router_timer,
1751		    br_multicast_local_router_expired, 0);
1752	setup_timer(&br->ip4_other_query.timer,
1753		    br_ip4_multicast_querier_expired, (unsigned long)br);
1754	setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1755		    (unsigned long)br);
1756#if IS_ENABLED(CONFIG_IPV6)
1757	setup_timer(&br->ip6_other_query.timer,
1758		    br_ip6_multicast_querier_expired, (unsigned long)br);
1759	setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1760		    (unsigned long)br);
1761#endif
1762}
1763
1764static void __br_multicast_open(struct net_bridge *br,
1765				struct bridge_mcast_own_query *query)
1766{
1767	query->startup_sent = 0;
1768
1769	if (br->multicast_disabled)
1770		return;
1771
1772	mod_timer(&query->timer, jiffies);
1773}
1774
1775void br_multicast_open(struct net_bridge *br)
1776{
1777	__br_multicast_open(br, &br->ip4_own_query);
1778#if IS_ENABLED(CONFIG_IPV6)
1779	__br_multicast_open(br, &br->ip6_own_query);
1780#endif
1781}
1782
1783void br_multicast_stop(struct net_bridge *br)
1784{
1785	del_timer_sync(&br->multicast_router_timer);
1786	del_timer_sync(&br->ip4_other_query.timer);
1787	del_timer_sync(&br->ip4_own_query.timer);
1788#if IS_ENABLED(CONFIG_IPV6)
1789	del_timer_sync(&br->ip6_other_query.timer);
1790	del_timer_sync(&br->ip6_own_query.timer);
1791#endif
1792}
1793
1794void br_multicast_dev_del(struct net_bridge *br)
1795{
1796	struct net_bridge_mdb_htable *mdb;
1797	struct net_bridge_mdb_entry *mp;
1798	struct hlist_node *n;
1799	u32 ver;
1800	int i;
1801
 
 
 
 
1802	spin_lock_bh(&br->multicast_lock);
1803	mdb = mlock_dereference(br->mdb, br);
1804	if (!mdb)
1805		goto out;
1806
1807	br->mdb = NULL;
1808
1809	ver = mdb->ver;
1810	for (i = 0; i < mdb->max; i++) {
1811		hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1812					  hlist[ver]) {
1813			del_timer(&mp->timer);
1814			call_rcu_bh(&mp->rcu, br_multicast_free_group);
1815		}
1816	}
1817
1818	if (mdb->old) {
1819		spin_unlock_bh(&br->multicast_lock);
1820		rcu_barrier_bh();
1821		spin_lock_bh(&br->multicast_lock);
1822		WARN_ON(mdb->old);
1823	}
1824
1825	mdb->old = mdb;
1826	call_rcu_bh(&mdb->rcu, br_mdb_free);
1827
1828out:
1829	spin_unlock_bh(&br->multicast_lock);
1830}
1831
1832int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1833{
1834	int err = -EINVAL;
1835
1836	spin_lock_bh(&br->multicast_lock);
 
 
1837
1838	switch (val) {
1839	case MDB_RTR_TYPE_DISABLED:
1840	case MDB_RTR_TYPE_PERM:
1841		del_timer(&br->multicast_router_timer);
1842		/* fall through */
1843	case MDB_RTR_TYPE_TEMP_QUERY:
1844		br->multicast_router = val;
1845		err = 0;
1846		break;
 
 
 
 
1847	}
1848
 
1849	spin_unlock_bh(&br->multicast_lock);
1850
1851	return err;
1852}
1853
1854static void __del_port_router(struct net_bridge_port *p)
1855{
1856	if (hlist_unhashed(&p->rlist))
1857		return;
1858	hlist_del_init_rcu(&p->rlist);
1859	br_rtr_notify(p->br->dev, p, RTM_DELMDB);
1860}
1861
1862int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1863{
1864	struct net_bridge *br = p->br;
1865	unsigned long now = jiffies;
1866	int err = -EINVAL;
1867
1868	spin_lock(&br->multicast_lock);
1869	if (p->multicast_router == val) {
1870		/* Refresh the temp router port timer */
1871		if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1872			mod_timer(&p->multicast_router_timer,
1873				  now + br->multicast_querier_interval);
1874		err = 0;
1875		goto unlock;
1876	}
1877	switch (val) {
1878	case MDB_RTR_TYPE_DISABLED:
1879		p->multicast_router = MDB_RTR_TYPE_DISABLED;
1880		__del_port_router(p);
1881		del_timer(&p->multicast_router_timer);
1882		break;
1883	case MDB_RTR_TYPE_TEMP_QUERY:
1884		p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1885		__del_port_router(p);
1886		break;
1887	case MDB_RTR_TYPE_PERM:
1888		p->multicast_router = MDB_RTR_TYPE_PERM;
 
1889		del_timer(&p->multicast_router_timer);
 
 
 
 
1890		br_multicast_add_router(br, p);
1891		break;
1892	case MDB_RTR_TYPE_TEMP:
1893		p->multicast_router = MDB_RTR_TYPE_TEMP;
1894		br_multicast_mark_router(br, p);
1895		break;
1896	default:
1897		goto unlock;
 
1898	}
1899	err = 0;
1900unlock:
1901	spin_unlock(&br->multicast_lock);
1902
1903	return err;
1904}
1905
1906static void br_multicast_start_querier(struct net_bridge *br,
1907				       struct bridge_mcast_own_query *query)
1908{
1909	struct net_bridge_port *port;
1910
1911	__br_multicast_open(br, query);
1912
1913	list_for_each_entry(port, &br->port_list, list) {
1914		if (port->state == BR_STATE_DISABLED ||
1915		    port->state == BR_STATE_BLOCKING)
1916			continue;
1917
1918		if (query == &br->ip4_own_query)
1919			br_multicast_enable(&port->ip4_own_query);
1920#if IS_ENABLED(CONFIG_IPV6)
1921		else
1922			br_multicast_enable(&port->ip6_own_query);
1923#endif
1924	}
1925}
1926
1927int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1928{
1929	int err = 0;
1930	struct net_bridge_mdb_htable *mdb;
1931
1932	spin_lock_bh(&br->multicast_lock);
1933	if (br->multicast_disabled == !val)
1934		goto unlock;
1935
1936	br->multicast_disabled = !val;
1937	if (br->multicast_disabled)
1938		goto unlock;
1939
1940	if (!netif_running(br->dev))
1941		goto unlock;
1942
1943	mdb = mlock_dereference(br->mdb, br);
1944	if (mdb) {
1945		if (mdb->old) {
1946			err = -EEXIST;
1947rollback:
1948			br->multicast_disabled = !!val;
1949			goto unlock;
1950		}
1951
1952		err = br_mdb_rehash(&br->mdb, mdb->max,
1953				    br->hash_elasticity);
1954		if (err)
1955			goto rollback;
1956	}
1957
1958	br_multicast_start_querier(br, &br->ip4_own_query);
1959#if IS_ENABLED(CONFIG_IPV6)
1960	br_multicast_start_querier(br, &br->ip6_own_query);
1961#endif
1962
1963unlock:
1964	spin_unlock_bh(&br->multicast_lock);
1965
1966	return err;
1967}
1968
1969int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1970{
1971	unsigned long max_delay;
1972
1973	val = !!val;
1974
1975	spin_lock_bh(&br->multicast_lock);
1976	if (br->multicast_querier == val)
1977		goto unlock;
1978
1979	br->multicast_querier = val;
1980	if (!val)
1981		goto unlock;
1982
1983	max_delay = br->multicast_query_response_interval;
1984
1985	if (!timer_pending(&br->ip4_other_query.timer))
1986		br->ip4_other_query.delay_time = jiffies + max_delay;
1987
1988	br_multicast_start_querier(br, &br->ip4_own_query);
1989
1990#if IS_ENABLED(CONFIG_IPV6)
1991	if (!timer_pending(&br->ip6_other_query.timer))
1992		br->ip6_other_query.delay_time = jiffies + max_delay;
1993
1994	br_multicast_start_querier(br, &br->ip6_own_query);
1995#endif
1996
1997unlock:
1998	spin_unlock_bh(&br->multicast_lock);
1999
2000	return 0;
2001}
2002
2003int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2004{
2005	int err = -EINVAL;
2006	u32 old;
2007	struct net_bridge_mdb_htable *mdb;
2008
2009	spin_lock_bh(&br->multicast_lock);
 
 
 
 
2010	if (!is_power_of_2(val))
2011		goto unlock;
2012
2013	mdb = mlock_dereference(br->mdb, br);
2014	if (mdb && val < mdb->size)
2015		goto unlock;
2016
2017	err = 0;
2018
2019	old = br->hash_max;
2020	br->hash_max = val;
2021
2022	if (mdb) {
2023		if (mdb->old) {
2024			err = -EEXIST;
2025rollback:
2026			br->hash_max = old;
2027			goto unlock;
2028		}
2029
2030		err = br_mdb_rehash(&br->mdb, br->hash_max,
2031				    br->hash_elasticity);
2032		if (err)
2033			goto rollback;
2034	}
2035
2036unlock:
2037	spin_unlock_bh(&br->multicast_lock);
2038
2039	return err;
2040}
2041
2042/**
2043 * br_multicast_list_adjacent - Returns snooped multicast addresses
2044 * @dev:	The bridge port adjacent to which to retrieve addresses
2045 * @br_ip_list:	The list to store found, snooped multicast IP addresses in
2046 *
2047 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2048 * snooping feature on all bridge ports of dev's bridge device, excluding
2049 * the addresses from dev itself.
2050 *
2051 * Returns the number of items added to br_ip_list.
2052 *
2053 * Notes:
2054 * - br_ip_list needs to be initialized by caller
2055 * - br_ip_list might contain duplicates in the end
2056 *   (needs to be taken care of by caller)
2057 * - br_ip_list needs to be freed by caller
2058 */
2059int br_multicast_list_adjacent(struct net_device *dev,
2060			       struct list_head *br_ip_list)
2061{
2062	struct net_bridge *br;
2063	struct net_bridge_port *port;
2064	struct net_bridge_port_group *group;
2065	struct br_ip_list *entry;
2066	int count = 0;
2067
2068	rcu_read_lock();
2069	if (!br_ip_list || !br_port_exists(dev))
2070		goto unlock;
2071
2072	port = br_port_get_rcu(dev);
2073	if (!port || !port->br)
2074		goto unlock;
2075
2076	br = port->br;
2077
2078	list_for_each_entry_rcu(port, &br->port_list, list) {
2079		if (!port->dev || port->dev == dev)
2080			continue;
2081
2082		hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2083			entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2084			if (!entry)
2085				goto unlock;
2086
2087			entry->addr = group->addr;
2088			list_add(&entry->list, br_ip_list);
2089			count++;
2090		}
2091	}
2092
2093unlock:
2094	rcu_read_unlock();
2095	return count;
2096}
2097EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2098
2099/**
2100 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2101 * @dev: The bridge port providing the bridge on which to check for a querier
2102 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2103 *
2104 * Checks whether the given interface has a bridge on top and if so returns
2105 * true if a valid querier exists anywhere on the bridged link layer.
2106 * Otherwise returns false.
2107 */
2108bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2109{
2110	struct net_bridge *br;
2111	struct net_bridge_port *port;
2112	struct ethhdr eth;
2113	bool ret = false;
2114
2115	rcu_read_lock();
2116	if (!br_port_exists(dev))
2117		goto unlock;
2118
2119	port = br_port_get_rcu(dev);
2120	if (!port || !port->br)
2121		goto unlock;
2122
2123	br = port->br;
2124
2125	memset(&eth, 0, sizeof(eth));
2126	eth.h_proto = htons(proto);
2127
2128	ret = br_multicast_querier_exists(br, &eth);
2129
2130unlock:
2131	rcu_read_unlock();
2132	return ret;
2133}
2134EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2135
2136/**
2137 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2138 * @dev: The bridge port adjacent to which to check for a querier
2139 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2140 *
2141 * Checks whether the given interface has a bridge on top and if so returns
2142 * true if a selected querier is behind one of the other ports of this
2143 * bridge. Otherwise returns false.
2144 */
2145bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2146{
2147	struct net_bridge *br;
2148	struct net_bridge_port *port;
2149	bool ret = false;
2150
2151	rcu_read_lock();
2152	if (!br_port_exists(dev))
2153		goto unlock;
2154
2155	port = br_port_get_rcu(dev);
2156	if (!port || !port->br)
2157		goto unlock;
2158
2159	br = port->br;
2160
2161	switch (proto) {
2162	case ETH_P_IP:
2163		if (!timer_pending(&br->ip4_other_query.timer) ||
2164		    rcu_dereference(br->ip4_querier.port) == port)
2165			goto unlock;
2166		break;
2167#if IS_ENABLED(CONFIG_IPV6)
2168	case ETH_P_IPV6:
2169		if (!timer_pending(&br->ip6_other_query.timer) ||
2170		    rcu_dereference(br->ip6_querier.port) == port)
2171			goto unlock;
2172		break;
2173#endif
2174	default:
2175		goto unlock;
2176	}
2177
2178	ret = true;
2179unlock:
2180	rcu_read_unlock();
2181	return ret;
2182}
2183EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);