br_multicast.c 48.8 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13
/*
 * 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>
14
#include <linux/export.h>
15 16 17 18
#include <linux/if_ether.h>
#include <linux/igmp.h>
#include <linux/jhash.h>
#include <linux/kernel.h>
19
#include <linux/log2.h>
20 21 22 23 24 25 26
#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>
27
#include <linux/inetdevice.h>
28
#include <net/ip.h>
E
Eric Dumazet 已提交
29
#if IS_ENABLED(CONFIG_IPV6)
30 31
#include <net/ipv6.h>
#include <net/mld.h>
32
#include <net/ip6_checksum.h>
33
#include <net/addrconf.h>
34
#endif
35 36 37

#include "br_private.h"

38
static void br_multicast_start_querier(struct net_bridge *br,
39
				       struct bridge_mcast_own_query *query);
40 41
static void br_multicast_add_router(struct net_bridge *br,
				    struct net_bridge_port *port);
42 43 44 45 46 47 48 49 50 51
static void br_ip4_multicast_leave_group(struct net_bridge *br,
					 struct net_bridge_port *port,
					 __be32 group,
					 __u16 vid);
#if IS_ENABLED(CONFIG_IPV6)
static void br_ip6_multicast_leave_group(struct net_bridge *br,
					 struct net_bridge_port *port,
					 const struct in6_addr *group,
					 __u16 vid);
#endif
C
Cong Wang 已提交
52
unsigned int br_mdb_rehash_seq;
53

54 55 56 57
static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
{
	if (a->proto != b->proto)
		return 0;
58 59
	if (a->vid != b->vid)
		return 0;
60 61 62
	switch (a->proto) {
	case htons(ETH_P_IP):
		return a->u.ip4 == b->u.ip4;
E
Eric Dumazet 已提交
63
#if IS_ENABLED(CONFIG_IPV6)
64 65 66
	case htons(ETH_P_IPV6):
		return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
#endif
67 68 69 70
	}
	return 0;
}

71 72
static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
				__u16 vid)
73
{
74
	return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
75 76
}

E
Eric Dumazet 已提交
77
#if IS_ENABLED(CONFIG_IPV6)
78
static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
79 80
				const struct in6_addr *ip,
				__u16 vid)
81
{
82 83
	return jhash_2words(ipv6_addr_hash(ip), vid,
			    mdb->secret) & (mdb->max - 1);
84 85 86
}
#endif

87 88 89 90 91
static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
			     struct br_ip *ip)
{
	switch (ip->proto) {
	case htons(ETH_P_IP):
92
		return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
E
Eric Dumazet 已提交
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;
99 100 101
}

static struct net_bridge_mdb_entry *__br_mdb_ip_get(
102
	struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
103 104 105
{
	struct net_bridge_mdb_entry *mp;

106
	hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
107
		if (br_ip_equal(&mp->addr, dst))
108 109 110 111 112 113
			return mp;
	}

	return NULL;
}

114 115
struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
					   struct br_ip *dst)
116 117 118 119 120 121 122
{
	if (!mdb)
		return NULL;

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

123
static struct net_bridge_mdb_entry *br_mdb_ip4_get(
124
	struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
125
{
126 127 128 129
	struct br_ip br_dst;

	br_dst.u.ip4 = dst;
	br_dst.proto = htons(ETH_P_IP);
130
	br_dst.vid = vid;
131

132
	return br_mdb_ip_get(mdb, &br_dst);
133 134
}

E
Eric Dumazet 已提交
135
#if IS_ENABLED(CONFIG_IPV6)
136
static struct net_bridge_mdb_entry *br_mdb_ip6_get(
137 138
	struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
	__u16 vid)
139 140
{
	struct br_ip br_dst;
141

A
Alexey Dobriyan 已提交
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);
147 148 149
}
#endif

150
struct 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);
154 155
	struct br_ip ip;

156
	if (br->multicast_disabled)
157 158
		return NULL;

159
	if (BR_INPUT_SKB_CB(skb)->igmp)
160 161
		return NULL;

162
	ip.proto = skb->protocol;
163
	ip.vid = vid;
164

165 166
	switch (skb->protocol) {
	case htons(ETH_P_IP):
167 168
		ip.u.ip4 = ip_hdr(skb)->daddr;
		break;
E
Eric Dumazet 已提交
169
#if IS_ENABLED(CONFIG_IPV6)
170
	case htons(ETH_P_IPV6):
A
Alexey Dobriyan 已提交
171
		ip.u.ip6 = ipv6_hdr(skb)->daddr;
172 173
		break;
#endif
174 175
	default:
		return NULL;
176 177
	}

178
	return br_mdb_ip_get(mdb, &ip);
179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201
}

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

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

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

	for (i = 0; i < old->max; i++)
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)]);
205 206 207 208 209 210 211

	if (!elasticity)
		return 0;

	maxlen = 0;
	for (i = 0; i < new->max; i++) {
		len = 0;
212
		hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
213 214 215 216 217 218 219 220
			len++;
		if (len > maxlen)
			maxlen = len;
	}

	return maxlen > elasticity ? -EINVAL : 0;
}

221
void br_multicast_free_pg(struct rcu_head *head)
222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246
{
	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;

247
	mp->mglist = false;
248 249 250 251

	if (mp->ports)
		goto out;

252 253
	mdb = mlock_dereference(br->mdb, br);

254 255 256 257 258 259 260 261 262 263 264 265
	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)
{
266
	struct net_bridge_mdb_htable *mdb;
267 268
	struct net_bridge_mdb_entry *mp;
	struct net_bridge_port_group *p;
269 270 271
	struct net_bridge_port_group __rcu **pp;

	mdb = mlock_dereference(br->mdb, br);
272

273
	mp = br_mdb_ip_get(mdb, &pg->addr);
274 275 276
	if (WARN_ON(!mp))
		return;

277 278 279
	for (pp = &mp->ports;
	     (p = mlock_dereference(*pp, br)) != NULL;
	     pp = &p->next) {
280 281 282
		if (p != pg)
			continue;

283
		rcu_assign_pointer(*pp, p->next);
284 285
		hlist_del_init(&p->mglist);
		del_timer(&p->timer);
286 287
		br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
			      p->state);
288 289
		call_rcu_bh(&p->rcu, br_multicast_free_pg);

290
		if (!mp->ports && !mp->mglist &&
291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306
		    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) ||
307
	    hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
308 309 310 311 312 313 314 315
		goto out;

	br_multicast_del_pg(br, pg);

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

316
static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
317 318
			 int elasticity)
{
319
	struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353
	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;
	}

C
Cong Wang 已提交
354
	br_mdb_rehash_seq++;
355 356 357 358 359 360 361 362
	call_rcu_bh(&mdb->rcu, br_mdb_free);

out:
	rcu_assign_pointer(*mdbp, mdb);

	return 0;
}

363 364
static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
						    __be32 group)
365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380
{
	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);

381
	ether_addr_copy(eth->h_source, br->dev->dev_addr);
382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401
	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;
402 403
	iph->saddr = br->multicast_query_use_ifaddr ?
		     inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428
	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;
}

E
Eric Dumazet 已提交
429
#if IS_ENABLED(CONFIG_IPV6)
430
static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
431
						    const struct in6_addr *group)
432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450
{
	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);

451
	ether_addr_copy(eth->h_source, br->dev->dev_addr);
452 453 454 455 456 457 458 459
	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);
460
	ip6h->payload_len = htons(8 + sizeof(*mldq));
461 462
	ip6h->nexthdr = IPPROTO_HOPOPTS;
	ip6h->hop_limit = 1;
463
	ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
464 465 466 467 468
	if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
			       &ip6h->saddr)) {
		kfree_skb(skb);
		return NULL;
	}
469
	ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
470 471 472 473 474 475 476 477

	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;
478 479
	hopopt[6] = IPV6_TLV_PAD1;		/* Pad1 */
	hopopt[7] = IPV6_TLV_PAD1;		/* Pad1 */
480 481 482 483 484 485 486

	skb_put(skb, sizeof(*ip6h) + 8);

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

487 488 489
	interval = ipv6_addr_any(group) ?
			br->multicast_query_response_interval :
			br->multicast_last_member_interval;
490 491 492 493 494 495

	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;
A
Alexey Dobriyan 已提交
496
	mldq->mld_mca = *group;
497 498 499 500 501 502 503 504 505 506 507 508 509 510 511

	/* 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

512 513 514 515 516 517
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);
E
Eric Dumazet 已提交
518
#if IS_ENABLED(CONFIG_IPV6)
519 520 521
	case htons(ETH_P_IPV6):
		return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
#endif
522 523 524 525
	}
	return NULL;
}

526
static struct net_bridge_mdb_entry *br_multicast_get_group(
527 528
	struct net_bridge *br, struct net_bridge_port *port,
	struct br_ip *group, int hash)
529
{
530
	struct net_bridge_mdb_htable *mdb;
531
	struct net_bridge_mdb_entry *mp;
532 533
	unsigned int count = 0;
	unsigned int max;
534 535 536
	int elasticity;
	int err;

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)))
541 542 543 544 545 546 547 548
			return mp;
	}

	elasticity = 0;
	max = mdb->max;

	if (unlikely(count > br->hash_elasticity && count)) {
		if (net_ratelimit())
549 550 551
			br_info(br, "Multicast hash table "
				"chain limit reached: %s\n",
				port ? port->dev->name : br->dev->name);
552 553 554 555 556 557

		elasticity = br->hash_elasticity;
	}

	if (mdb->size >= max) {
		max *= 2;
558 559 560 561 562
		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);
563 564 565 566 567 568 569 570 571 572
			err = -E2BIG;
disable:
			br->multicast_disabled = 1;
			goto err;
		}
	}

	if (max > mdb->max || elasticity) {
		if (mdb->old) {
			if (net_ratelimit())
573 574 575
				br_info(br, "Multicast hash table "
					"on fire: %s\n",
					port ? port->dev->name : br->dev->name);
576 577 578 579 580 581
			err = -EEXIST;
			goto err;
		}

		err = br_mdb_rehash(&br->mdb, max, elasticity);
		if (err) {
582 583 584 585
			br_warn(br, "Cannot rehash multicast "
				"hash table, disabling snooping: %s, %d, %d\n",
				port ? port->dev->name : br->dev->name,
				mdb->size, err);
586 587 588 589 590 591 592 593 594 595 596 597 598 599
			goto disable;
		}

		err = -EAGAIN;
		goto err;
	}

	return NULL;

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

600 601
struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
	struct net_bridge_port *port, struct br_ip *group)
602
{
603
	struct net_bridge_mdb_htable *mdb;
604 605
	struct net_bridge_mdb_entry *mp;
	int hash;
606
	int err;
607

608
	mdb = rcu_dereference_protected(br->mdb, 1);
609
	if (!mdb) {
610 611 612
		err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
		if (err)
			return ERR_PTR(err);
613 614 615 616 617 618 619 620 621 622 623
		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:
624
		mdb = rcu_dereference_protected(br->mdb, 1);
625 626 627 628 629 630 631 632 633
		hash = br_ip_hash(mdb, group);
		break;

	default:
		goto out;
	}

	mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
	if (unlikely(!mp))
634
		return ERR_PTR(-ENOMEM);
635 636

	mp->br = br;
637
	mp->addr = *group;
638 639 640
	setup_timer(&mp->timer, br_multicast_group_expired,
		    (unsigned long)mp);

641 642 643 644 645 646 647
	hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
	mdb->size++;

out:
	return mp;
}

648 649 650
struct net_bridge_port_group *br_multicast_new_port_group(
			struct net_bridge_port *port,
			struct br_ip *group,
651 652
			struct net_bridge_port_group __rcu *next,
			unsigned char state)
653 654 655 656 657 658 659 660 661
{
	struct net_bridge_port_group *p;

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

	p->addr = *group;
	p->port = port;
662
	p->state = state;
663
	rcu_assign_pointer(p->next, next);
664 665 666 667 668 669
	hlist_add_head(&p->mglist, &port->mglist);
	setup_timer(&p->timer, br_multicast_port_group_expired,
		    (unsigned long)p);
	return p;
}

670
static int br_multicast_add_group(struct net_bridge *br,
671 672
				  struct net_bridge_port *port,
				  struct br_ip *group)
673 674 675
{
	struct net_bridge_mdb_entry *mp;
	struct net_bridge_port_group *p;
676
	struct net_bridge_port_group __rcu **pp;
677
	unsigned long now = jiffies;
678 679 680 681 682 683 684 685 686
	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);
687
	if (IS_ERR(mp))
688 689 690
		goto err;

	if (!port) {
691
		mp->mglist = true;
692
		mod_timer(&mp->timer, now + br->multicast_membership_interval);
693 694 695
		goto out;
	}

696 697 698
	for (pp = &mp->ports;
	     (p = mlock_dereference(*pp, br)) != NULL;
	     pp = &p->next) {
699
		if (p->port == port)
700
			goto found;
701 702 703 704
		if ((unsigned long)p->port < (unsigned long)port)
			break;
	}

705
	p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
706 707 708
	if (unlikely(!p))
		goto err;
	rcu_assign_pointer(*pp, p);
709
	br_mdb_notify(br->dev, port, group, RTM_NEWMDB, MDB_TEMPORARY);
710

711 712
found:
	mod_timer(&p->timer, now + br->multicast_membership_interval);
713 714 715 716 717 718 719 720
out:
	err = 0;

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

721 722
static int br_ip4_multicast_add_group(struct net_bridge *br,
				      struct net_bridge_port *port,
723 724
				      __be32 group,
				      __u16 vid)
725 726 727 728 729 730 731 732
{
	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);
733
	br_group.vid = vid;
734 735 736 737

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

E
Eric Dumazet 已提交
738
#if IS_ENABLED(CONFIG_IPV6)
739 740
static int br_ip6_multicast_add_group(struct net_bridge *br,
				      struct net_bridge_port *port,
741 742
				      const struct in6_addr *group,
				      __u16 vid)
743 744 745
{
	struct br_ip br_group;

746
	if (ipv6_addr_is_ll_all_nodes(group))
747 748
		return 0;

A
Alexey Dobriyan 已提交
749
	br_group.u.ip6 = *group;
750
	br_group.proto = htons(ETH_P_IPV6);
751
	br_group.vid = vid;
752 753 754 755 756

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

757 758 759 760 761 762 763 764 765 766 767 768
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);
769
	br_rtr_notify(br->dev, port, RTM_DELMDB);
770 771 772 773 774 775 776 777 778

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

static void br_multicast_local_router_expired(unsigned long data)
{
}

779
static void br_multicast_querier_expired(struct net_bridge *br,
780
					 struct bridge_mcast_own_query *query)
781 782 783 784 785
{
	spin_lock(&br->multicast_lock);
	if (!netif_running(br->dev) || br->multicast_disabled)
		goto out;

786
	br_multicast_start_querier(br, query);
787 788 789 790 791

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

792 793 794 795
static void br_ip4_multicast_querier_expired(unsigned long data)
{
	struct net_bridge *br = (void *)data;

796
	br_multicast_querier_expired(br, &br->ip4_own_query);
797 798 799 800 801 802 803
}

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

804
	br_multicast_querier_expired(br, &br->ip6_own_query);
805 806 807
}
#endif

808 809 810 811 812 813 814 815 816 817 818 819
static void br_multicast_select_own_querier(struct net_bridge *br,
					    struct br_ip *ip,
					    struct sk_buff *skb)
{
	if (ip->proto == htons(ETH_P_IP))
		br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
#if IS_ENABLED(CONFIG_IPV6)
	else
		br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
#endif
}

820 821 822
static void __br_multicast_send_query(struct net_bridge *br,
				      struct net_bridge_port *port,
				      struct br_ip *ip)
823 824 825
{
	struct sk_buff *skb;

826
	skb = br_multicast_alloc_query(br, ip);
827
	if (!skb)
828
		return;
829 830 831

	if (port) {
		skb->dev = port->dev;
832 833
		NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, NULL, skb,
			NULL, skb->dev,
834
			br_dev_queue_push_xmit);
835 836
	} else {
		br_multicast_select_own_querier(br, ip, skb);
837
		netif_rx(skb);
838
	}
839 840 841
}

static void br_multicast_send_query(struct net_bridge *br,
842
				    struct net_bridge_port *port,
843
				    struct bridge_mcast_own_query *own_query)
844 845 846
{
	unsigned long time;
	struct br_ip br_group;
847
	struct bridge_mcast_other_query *other_query = NULL;
848 849

	if (!netif_running(br->dev) || br->multicast_disabled ||
850
	    !br->multicast_querier)
851 852
		return;

853 854
	memset(&br_group.u, 0, sizeof(br_group.u));

855 856 857
	if (port ? (own_query == &port->ip4_own_query) :
		   (own_query == &br->ip4_own_query)) {
		other_query = &br->ip4_other_query;
858
		br_group.proto = htons(ETH_P_IP);
E
Eric Dumazet 已提交
859
#if IS_ENABLED(CONFIG_IPV6)
860
	} else {
861
		other_query = &br->ip6_other_query;
862
		br_group.proto = htons(ETH_P_IPV6);
863
#endif
864 865
	}

866
	if (!other_query || timer_pending(&other_query->timer))
867 868 869
		return;

	__br_multicast_send_query(br, port, &br_group);
870 871

	time = jiffies;
872
	time += own_query->startup_sent < br->multicast_startup_query_count ?
873 874
		br->multicast_startup_query_interval :
		br->multicast_query_interval;
875
	mod_timer(&own_query->timer, time);
876 877
}

878 879 880
static void
br_multicast_port_query_expired(struct net_bridge_port *port,
				struct bridge_mcast_own_query *query)
881 882 883 884
{
	struct net_bridge *br = port->br;

	spin_lock(&br->multicast_lock);
885 886
	if (port->state == BR_STATE_DISABLED ||
	    port->state == BR_STATE_BLOCKING)
887 888
		goto out;

889 890
	if (query->startup_sent < br->multicast_startup_query_count)
		query->startup_sent++;
891

892
	br_multicast_send_query(port->br, port, query);
893 894 895 896 897

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

898 899 900 901
static void br_ip4_multicast_port_query_expired(unsigned long data)
{
	struct net_bridge_port *port = (void *)data;

902
	br_multicast_port_query_expired(port, &port->ip4_own_query);
903 904 905 906 907 908 909
}

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

910
	br_multicast_port_query_expired(port, &port->ip6_own_query);
911 912 913
}
#endif

914 915 916 917 918 919
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);
920 921
	setup_timer(&port->ip4_own_query.timer,
		    br_ip4_multicast_port_query_expired, (unsigned long)port);
922
#if IS_ENABLED(CONFIG_IPV6)
923 924
	setup_timer(&port->ip6_own_query.timer,
		    br_ip6_multicast_port_query_expired, (unsigned long)port);
925
#endif
926 927 928 929
}

void br_multicast_del_port(struct net_bridge_port *port)
{
930 931 932 933 934 935 936 937 938
	struct net_bridge *br = port->br;
	struct net_bridge_port_group *pg;
	struct hlist_node *n;

	/* Take care of the remaining groups, only perm ones should be left */
	spin_lock_bh(&br->multicast_lock);
	hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
		br_multicast_del_pg(br, pg);
	spin_unlock_bh(&br->multicast_lock);
939 940 941
	del_timer_sync(&port->multicast_router_timer);
}

942
static void br_multicast_enable(struct bridge_mcast_own_query *query)
943
{
944
	query->startup_sent = 0;
945

946 947 948
	if (try_to_del_timer_sync(&query->timer) >= 0 ||
	    del_timer(&query->timer))
		mod_timer(&query->timer, jiffies);
949 950
}

951 952 953 954 955 956 957 958
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;

959
	br_multicast_enable(&port->ip4_own_query);
960
#if IS_ENABLED(CONFIG_IPV6)
961
	br_multicast_enable(&port->ip6_own_query);
962
#endif
963 964
	if (port->multicast_router == 2 && hlist_unhashed(&port->rlist))
		br_multicast_add_router(br, port);
965 966 967 968 969 970 971 972 973

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

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

	spin_lock(&br->multicast_lock);
977
	hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
978 979
		if (pg->state == MDB_TEMPORARY)
			br_multicast_del_pg(br, pg);
980

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

993 994
static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
					 struct net_bridge_port *port,
995 996
					 struct sk_buff *skb,
					 u16 vid)
997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015
{
	struct igmpv3_report *ih;
	struct igmpv3_grec *grec;
	int i;
	int len;
	int num;
	int type;
	int err = 0;
	__be32 group;

	ih = igmpv3_report_hdr(skb);
	num = ntohs(ih->ngrec);
	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
1016
		grec = (void *)(skb->data + len - sizeof(*grec));
1017 1018 1019
		group = grec->grec_mca;
		type = grec->grec_type;

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

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

		default:
			continue;
		}

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

	return err;
}

E
Eric Dumazet 已提交
1052
#if IS_ENABLED(CONFIG_IPV6)
1053 1054
static int br_ip6_multicast_mld2_report(struct net_bridge *br,
					struct net_bridge_port *port,
1055 1056
					struct sk_buff *skb,
					u16 vid)
1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076
{
	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,
1077
							  grec_nsrcs),
1078 1079 1080 1081 1082 1083
					   sizeof(_nsrcs), &_nsrcs);
		if (!nsrcs)
			return -EINVAL;

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

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

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

		default:
			continue;
		}

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

	return err;
}
#endif

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

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

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

	return false;

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

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

1144 1145 1146 1147 1148
	return true;
}

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

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

	return false;

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

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

1167 1168 1169 1170 1171
	return true;
}
#endif

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

	return false;
}

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

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

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

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

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

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

1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239
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;

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

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

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

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

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

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

	group = ih->group;

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

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

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

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

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

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

	max_delay *= br->multicast_last_member_count;

1316
	if (mp->mglist &&
1317 1318 1319 1320 1321
	    (timer_pending(&mp->timer) ?
	     time_after(mp->timer.expires, now + max_delay) :
	     try_to_del_timer_sync(&mp->timer) >= 0))
		mod_timer(&mp->timer, now + max_delay);

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

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

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

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

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

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

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

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

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

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

	max_delay *= br->multicast_last_member_count;
1399
	if (mp->mglist &&
1400 1401 1402 1403 1404
	    (timer_pending(&mp->timer) ?
	     time_after(mp->timer.expires, now + max_delay) :
	     try_to_del_timer_sync(&mp->timer) >= 0))
		mod_timer(&mp->timer, now + max_delay);

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

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

1420 1421 1422 1423 1424 1425
static void
br_multicast_leave_group(struct net_bridge *br,
			 struct net_bridge_port *port,
			 struct br_ip *group,
			 struct bridge_mcast_other_query *other_query,
			 struct bridge_mcast_own_query *own_query)
1426 1427 1428 1429 1430 1431 1432 1433 1434 1435
{
	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) ||
1436
	    timer_pending(&other_query->timer))
1437 1438
		goto out;

1439
	mdb = mlock_dereference(br->mdb, br);
1440 1441 1442 1443
	mp = br_mdb_ip_get(mdb, group);
	if (!mp)
		goto out;

1444
	if (br->multicast_querier) {
1445 1446 1447 1448
		__br_multicast_send_query(br, port, &mp->addr);

		time = jiffies + br->multicast_last_member_count *
				 br->multicast_last_member_interval;
1449

1450
		mod_timer(&own_query->timer, time);
1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468

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

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

			break;
		}
	}

1469
	if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480
		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);
1481 1482
			br_mdb_notify(br->dev, port, group, RTM_DELMDB,
				      p->state);
1483 1484
			call_rcu_bh(&p->rcu, br_multicast_free_pg);

1485
			if (!mp->ports && !mp->mglist &&
1486 1487 1488 1489 1490 1491
			    netif_running(br->dev))
				mod_timer(&mp->timer, jiffies);
		}
		goto out;
	}

1492 1493 1494 1495 1496
	now = jiffies;
	time = now + br->multicast_last_member_count *
		     br->multicast_last_member_interval;

	if (!port) {
1497
		if (mp->mglist &&
1498 1499 1500 1501 1502
		    (timer_pending(&mp->timer) ?
		     time_after(mp->timer.expires, time) :
		     try_to_del_timer_sync(&mp->timer) >= 0)) {
			mod_timer(&mp->timer, time);
		}
1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520

		goto out;
	}

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

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

		break;
1521 1522 1523 1524 1525
	}
out:
	spin_unlock(&br->multicast_lock);
}

1526 1527
static void br_ip4_multicast_leave_group(struct net_bridge *br,
					 struct net_bridge_port *port,
1528 1529
					 __be32 group,
					 __u16 vid)
1530 1531
{
	struct br_ip br_group;
1532
	struct bridge_mcast_own_query *own_query;
1533 1534 1535 1536

	if (ipv4_is_local_multicast(group))
		return;

1537 1538
	own_query = port ? &port->ip4_own_query : &br->ip4_own_query;

1539 1540
	br_group.u.ip4 = group;
	br_group.proto = htons(ETH_P_IP);
1541
	br_group.vid = vid;
1542

1543 1544
	br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
				 own_query);
1545 1546
}

E
Eric Dumazet 已提交
1547
#if IS_ENABLED(CONFIG_IPV6)
1548 1549
static void br_ip6_multicast_leave_group(struct net_bridge *br,
					 struct net_bridge_port *port,
1550 1551
					 const struct in6_addr *group,
					 __u16 vid)
1552 1553
{
	struct br_ip br_group;
1554
	struct bridge_mcast_own_query *own_query;
1555

1556
	if (ipv6_addr_is_ll_all_nodes(group))
1557 1558
		return;

1559 1560
	own_query = port ? &port->ip6_own_query : &br->ip6_own_query;

A
Alexey Dobriyan 已提交
1561
	br_group.u.ip6 = *group;
1562
	br_group.proto = htons(ETH_P_IPV6);
1563
	br_group.vid = vid;
1564

1565 1566
	br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
				 own_query);
1567 1568
}
#endif
1569

1570 1571
static int br_multicast_ipv4_rcv(struct net_bridge *br,
				 struct net_bridge_port *port,
1572 1573
				 struct sk_buff *skb,
				 u16 vid)
1574
{
1575
	struct sk_buff *skb_trimmed = NULL;
1576 1577 1578
	struct igmphdr *ih;
	int err;

1579
	err = ip_mc_check_igmp(skb, &skb_trimmed);
1580

1581 1582
	if (err == -ENOMSG) {
		if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
1583
			BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1584
		return 0;
1585 1586
	} else if (err < 0) {
		return err;
1587
	}
1588 1589

	BR_INPUT_SKB_CB(skb)->igmp = 1;
1590
	ih = igmp_hdr(skb);
1591 1592 1593 1594

	switch (ih->type) {
	case IGMP_HOST_MEMBERSHIP_REPORT:
	case IGMPV2_HOST_MEMBERSHIP_REPORT:
1595
		BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1596
		err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1597 1598
		break;
	case IGMPV3_HOST_MEMBERSHIP_REPORT:
1599
		err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1600 1601
		break;
	case IGMP_HOST_MEMBERSHIP_QUERY:
1602
		err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1603 1604
		break;
	case IGMP_HOST_LEAVE_MESSAGE:
1605
		br_ip4_multicast_leave_group(br, port, ih->group, vid);
1606 1607 1608
		break;
	}

1609 1610 1611
	if (skb_trimmed)
		kfree_skb(skb_trimmed);

1612 1613 1614
	return err;
}

E
Eric Dumazet 已提交
1615
#if IS_ENABLED(CONFIG_IPV6)
1616 1617
static int br_multicast_ipv6_rcv(struct net_bridge *br,
				 struct net_bridge_port *port,
1618 1619
				 struct sk_buff *skb,
				 u16 vid)
1620
{
1621 1622
	struct sk_buff *skb_trimmed = NULL;
	struct mld_msg *mld;
1623 1624
	int err;

1625
	err = ipv6_mc_check_mld(skb, &skb_trimmed);
1626

1627 1628 1629
	if (err == -ENOMSG) {
		if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
			BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1630
		return 0;
1631 1632
	} else if (err < 0) {
		return err;
1633 1634 1635
	}

	BR_INPUT_SKB_CB(skb)->igmp = 1;
1636
	mld = (struct mld_msg *)skb_transport_header(skb);
1637

1638
	switch (mld->mld_type) {
1639
	case ICMPV6_MGM_REPORT:
1640
		BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1641
		err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1642 1643
		break;
	case ICMPV6_MLD2_REPORT:
1644
		err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1645 1646
		break;
	case ICMPV6_MGM_QUERY:
1647
		err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1648 1649
		break;
	case ICMPV6_MGM_REDUCTION:
1650
		br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1651
		break;
1652 1653
	}

1654 1655 1656
	if (skb_trimmed)
		kfree_skb(skb_trimmed);

1657 1658 1659 1660
	return err;
}
#endif

1661
int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1662
		     struct sk_buff *skb, u16 vid)
1663
{
1664 1665 1666
	BR_INPUT_SKB_CB(skb)->igmp = 0;
	BR_INPUT_SKB_CB(skb)->mrouters_only = 0;

1667 1668 1669 1670 1671
	if (br->multicast_disabled)
		return 0;

	switch (skb->protocol) {
	case htons(ETH_P_IP):
1672
		return br_multicast_ipv4_rcv(br, port, skb, vid);
E
Eric Dumazet 已提交
1673
#if IS_ENABLED(CONFIG_IPV6)
1674
	case htons(ETH_P_IPV6):
1675
		return br_multicast_ipv6_rcv(br, port, skb, vid);
1676
#endif
1677 1678 1679 1680 1681
	}

	return 0;
}

1682
static void br_multicast_query_expired(struct net_bridge *br,
1683 1684
				       struct bridge_mcast_own_query *query,
				       struct bridge_mcast_querier *querier)
1685 1686 1687 1688 1689
{
	spin_lock(&br->multicast_lock);
	if (query->startup_sent < br->multicast_startup_query_count)
		query->startup_sent++;

1690
	RCU_INIT_POINTER(querier->port, NULL);
1691 1692 1693 1694 1695
	br_multicast_send_query(br, NULL, query);
	spin_unlock(&br->multicast_lock);
}

static void br_ip4_multicast_query_expired(unsigned long data)
1696 1697 1698
{
	struct net_bridge *br = (void *)data;

1699
	br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1700
}
1701

1702 1703 1704 1705
#if IS_ENABLED(CONFIG_IPV6)
static void br_ip6_multicast_query_expired(unsigned long data)
{
	struct net_bridge *br = (void *)data;
1706

1707
	br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1708
}
1709
#endif
1710 1711 1712 1713 1714 1715 1716

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

	br->multicast_router = 1;
1717
	br->multicast_querier = 0;
1718
	br->multicast_query_use_ifaddr = 0;
1719 1720 1721 1722 1723 1724 1725 1726 1727 1728
	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;

1729
	br->ip4_other_query.delay_time = 0;
1730
	br->ip4_querier.port = NULL;
1731
#if IS_ENABLED(CONFIG_IPV6)
1732
	br->ip6_other_query.delay_time = 0;
1733
	br->ip6_querier.port = NULL;
1734
#endif
1735

1736 1737 1738
	spin_lock_init(&br->multicast_lock);
	setup_timer(&br->multicast_router_timer,
		    br_multicast_local_router_expired, 0);
1739 1740 1741
	setup_timer(&br->ip4_other_query.timer,
		    br_ip4_multicast_querier_expired, (unsigned long)br);
	setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1742
		    (unsigned long)br);
1743
#if IS_ENABLED(CONFIG_IPV6)
1744 1745 1746
	setup_timer(&br->ip6_other_query.timer,
		    br_ip6_multicast_querier_expired, (unsigned long)br);
	setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1747 1748
		    (unsigned long)br);
#endif
1749 1750
}

1751
static void __br_multicast_open(struct net_bridge *br,
1752
				struct bridge_mcast_own_query *query)
1753
{
1754
	query->startup_sent = 0;
1755 1756 1757 1758

	if (br->multicast_disabled)
		return;

1759 1760 1761 1762 1763
	mod_timer(&query->timer, jiffies);
}

void br_multicast_open(struct net_bridge *br)
{
1764
	__br_multicast_open(br, &br->ip4_own_query);
1765
#if IS_ENABLED(CONFIG_IPV6)
1766
	__br_multicast_open(br, &br->ip6_own_query);
1767
#endif
1768 1769 1770 1771 1772
}

void br_multicast_stop(struct net_bridge *br)
{
	del_timer_sync(&br->multicast_router_timer);
1773 1774
	del_timer_sync(&br->ip4_other_query.timer);
	del_timer_sync(&br->ip4_own_query.timer);
1775
#if IS_ENABLED(CONFIG_IPV6)
1776 1777
	del_timer_sync(&br->ip6_other_query.timer);
	del_timer_sync(&br->ip6_own_query.timer);
1778
#endif
1779 1780 1781 1782 1783 1784 1785 1786 1787
}

void br_multicast_dev_del(struct net_bridge *br)
{
	struct net_bridge_mdb_htable *mdb;
	struct net_bridge_mdb_entry *mp;
	struct hlist_node *n;
	u32 ver;
	int i;
1788 1789

	spin_lock_bh(&br->multicast_lock);
1790
	mdb = mlock_dereference(br->mdb, br);
1791 1792 1793 1794 1795 1796 1797
	if (!mdb)
		goto out;

	br->mdb = NULL;

	ver = mdb->ver;
	for (i = 0; i < mdb->max; i++) {
1798
		hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1799 1800 1801 1802 1803 1804 1805 1806
					  hlist[ver]) {
			del_timer(&mp->timer);
			call_rcu_bh(&mp->rcu, br_multicast_free_group);
		}
	}

	if (mdb->old) {
		spin_unlock_bh(&br->multicast_lock);
1807
		rcu_barrier_bh();
1808 1809 1810 1811 1812 1813 1814 1815 1816 1817
		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);
}
1818 1819 1820

int br_multicast_set_router(struct net_bridge *br, unsigned long val)
{
1821
	int err = -EINVAL;
1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843

	spin_lock_bh(&br->multicast_lock);

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

	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;
1844
	int err = -EINVAL;
1845 1846 1847 1848 1849 1850 1851 1852 1853 1854

	spin_lock(&br->multicast_lock);

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

1855
		if (val < 2 && !hlist_unhashed(&p->rlist)) {
1856
			hlist_del_init_rcu(&p->rlist);
1857 1858
			br_rtr_notify(br->dev, p, RTM_DELMDB);
		}
1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875

		if (val == 1)
			break;

		del_timer(&p->multicast_router_timer);

		if (val == 0)
			break;

		br_multicast_add_router(br, p);
		break;
	}

	spin_unlock(&br->multicast_lock);

	return err;
}
1876

1877
static void br_multicast_start_querier(struct net_bridge *br,
1878
				       struct bridge_mcast_own_query *query)
1879 1880
{
	struct net_bridge_port *port;
1881

1882
	__br_multicast_open(br, query);
1883 1884 1885 1886 1887 1888

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

1889 1890
		if (query == &br->ip4_own_query)
			br_multicast_enable(&port->ip4_own_query);
1891 1892
#if IS_ENABLED(CONFIG_IPV6)
		else
1893
			br_multicast_enable(&port->ip6_own_query);
1894
#endif
1895 1896 1897 1898 1899
	}
}

int br_multicast_toggle(struct net_bridge *br, unsigned long val)
{
1900
	int err = 0;
1901
	struct net_bridge_mdb_htable *mdb;
1902

1903
	spin_lock_bh(&br->multicast_lock);
1904 1905 1906 1907 1908 1909 1910
	if (br->multicast_disabled == !val)
		goto unlock;

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

1911 1912 1913
	if (!netif_running(br->dev))
		goto unlock;

1914 1915 1916
	mdb = mlock_dereference(br->mdb, br);
	if (mdb) {
		if (mdb->old) {
1917 1918 1919 1920 1921 1922
			err = -EEXIST;
rollback:
			br->multicast_disabled = !!val;
			goto unlock;
		}

1923
		err = br_mdb_rehash(&br->mdb, mdb->max,
1924 1925 1926 1927 1928
				    br->hash_elasticity);
		if (err)
			goto rollback;
	}

1929
	br_multicast_start_querier(br, &br->ip4_own_query);
1930
#if IS_ENABLED(CONFIG_IPV6)
1931
	br_multicast_start_querier(br, &br->ip6_own_query);
1932
#endif
1933 1934

unlock:
1935
	spin_unlock_bh(&br->multicast_lock);
1936 1937 1938

	return err;
}
1939

1940 1941
int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
{
1942 1943
	unsigned long max_delay;

1944 1945 1946 1947 1948 1949 1950
	val = !!val;

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

	br->multicast_querier = val;
1951 1952 1953 1954 1955
	if (!val)
		goto unlock;

	max_delay = br->multicast_query_response_interval;

1956 1957
	if (!timer_pending(&br->ip4_other_query.timer))
		br->ip4_other_query.delay_time = jiffies + max_delay;
1958

1959
	br_multicast_start_querier(br, &br->ip4_own_query);
1960 1961

#if IS_ENABLED(CONFIG_IPV6)
1962 1963
	if (!timer_pending(&br->ip6_other_query.timer))
		br->ip6_other_query.delay_time = jiffies + max_delay;
1964

1965
	br_multicast_start_querier(br, &br->ip6_own_query);
1966
#endif
1967 1968 1969 1970 1971 1972 1973

unlock:
	spin_unlock_bh(&br->multicast_lock);

	return 0;
}

1974 1975
int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
{
1976
	int err = -EINVAL;
1977
	u32 old;
1978
	struct net_bridge_mdb_htable *mdb;
1979

1980
	spin_lock_bh(&br->multicast_lock);
1981 1982
	if (!is_power_of_2(val))
		goto unlock;
1983 1984 1985

	mdb = mlock_dereference(br->mdb, br);
	if (mdb && val < mdb->size)
1986 1987 1988 1989 1990 1991 1992
		goto unlock;

	err = 0;

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

1993 1994
	if (mdb) {
		if (mdb->old) {
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007
			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:
2008
	spin_unlock_bh(&br->multicast_lock);
2009 2010 2011

	return err;
}
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068

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

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

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

	br = port->br;

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

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

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

unlock:
	rcu_read_unlock();
	return count;
}
EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2069

2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106
/**
 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
 * @dev: The bridge port providing the bridge on which to check for a querier
 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
 *
 * Checks whether the given interface has a bridge on top and if so returns
 * true if a valid querier exists anywhere on the bridged link layer.
 * Otherwise returns false.
 */
bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
{
	struct net_bridge *br;
	struct net_bridge_port *port;
	struct ethhdr eth;
	bool ret = false;

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

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

	br = port->br;

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

	ret = br_multicast_querier_exists(br, &eth);

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

2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137
/**
 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
 * @dev: The bridge port adjacent to which to check for a querier
 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
 *
 * Checks whether the given interface has a bridge on top and if so returns
 * true if a selected querier is behind one of the other ports of this
 * bridge. Otherwise returns false.
 */
bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
{
	struct net_bridge *br;
	struct net_bridge_port *port;
	bool ret = false;

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

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

	br = port->br;

	switch (proto) {
	case ETH_P_IP:
		if (!timer_pending(&br->ip4_other_query.timer) ||
		    rcu_dereference(br->ip4_querier.port) == port)
			goto unlock;
		break;
2138
#if IS_ENABLED(CONFIG_IPV6)
2139 2140 2141 2142 2143
	case ETH_P_IPV6:
		if (!timer_pending(&br->ip6_other_query.timer) ||
		    rcu_dereference(br->ip6_querier.port) == port)
			goto unlock;
		break;
2144
#endif
2145 2146 2147 2148 2149 2150 2151 2152 2153 2154
	default:
		goto unlock;
	}

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