br_multicast.c 48.1 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);
284 285 286 287
		hlist_del_init(&p->mglist);
		del_timer(&p->timer);
		call_rcu_bh(&p->rcu, br_multicast_free_pg);

288
		if (!mp->ports && !mp->mglist &&
289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304
		    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) ||
305
	    hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
306 307 308 309 310 311 312 313
		goto out;

	br_multicast_del_pg(br, pg);

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

314
static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
315 316
			 int elasticity)
{
317
	struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351
	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
352
	br_mdb_rehash_seq++;
353 354 355 356 357 358 359 360
	call_rcu_bh(&mdb->rcu, br_mdb_free);

out:
	rcu_assign_pointer(*mdbp, mdb);

	return 0;
}

361 362
static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
						    __be32 group)
363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378
{
	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);

379
	ether_addr_copy(eth->h_source, br->dev->dev_addr);
380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399
	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;
400 401
	iph->saddr = br->multicast_query_use_ifaddr ?
		     inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426
	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
427
#if IS_ENABLED(CONFIG_IPV6)
428
static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
429
						    const struct in6_addr *group)
430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448
{
	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);

449
	ether_addr_copy(eth->h_source, br->dev->dev_addr);
450 451 452 453 454 455 456 457
	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);
458
	ip6h->payload_len = htons(8 + sizeof(*mldq));
459 460
	ip6h->nexthdr = IPPROTO_HOPOPTS;
	ip6h->hop_limit = 1;
461
	ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
462 463 464 465 466
	if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
			       &ip6h->saddr)) {
		kfree_skb(skb);
		return NULL;
	}
467
	ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
468 469 470 471 472 473 474 475

	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;
476 477
	hopopt[6] = IPV6_TLV_PAD1;		/* Pad1 */
	hopopt[7] = IPV6_TLV_PAD1;		/* Pad1 */
478 479 480 481 482 483 484

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

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

485 486 487
	interval = ipv6_addr_any(group) ?
			br->multicast_query_response_interval :
			br->multicast_last_member_interval;
488 489 490 491 492 493

	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
494
	mldq->mld_mca = *group;
495 496 497 498 499 500 501 502 503 504 505 506 507 508 509

	/* 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

510 511 512 513 514 515
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
516
#if IS_ENABLED(CONFIG_IPV6)
517 518 519
	case htons(ETH_P_IPV6):
		return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
#endif
520 521 522 523
	}
	return NULL;
}

524
static struct net_bridge_mdb_entry *br_multicast_get_group(
525 526
	struct net_bridge *br, struct net_bridge_port *port,
	struct br_ip *group, int hash)
527
{
528
	struct net_bridge_mdb_htable *mdb;
529
	struct net_bridge_mdb_entry *mp;
530 531
	unsigned int count = 0;
	unsigned int max;
532 533 534
	int elasticity;
	int err;

535
	mdb = rcu_dereference_protected(br->mdb, 1);
536
	hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
537
		count++;
538
		if (unlikely(br_ip_equal(group, &mp->addr)))
539 540 541 542 543 544 545 546
			return mp;
	}

	elasticity = 0;
	max = mdb->max;

	if (unlikely(count > br->hash_elasticity && count)) {
		if (net_ratelimit())
547 548 549
			br_info(br, "Multicast hash table "
				"chain limit reached: %s\n",
				port ? port->dev->name : br->dev->name);
550 551 552 553 554 555

		elasticity = br->hash_elasticity;
	}

	if (mdb->size >= max) {
		max *= 2;
556 557 558 559 560
		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);
561 562 563 564 565 566 567 568 569 570
			err = -E2BIG;
disable:
			br->multicast_disabled = 1;
			goto err;
		}
	}

	if (max > mdb->max || elasticity) {
		if (mdb->old) {
			if (net_ratelimit())
571 572 573
				br_info(br, "Multicast hash table "
					"on fire: %s\n",
					port ? port->dev->name : br->dev->name);
574 575 576 577 578 579
			err = -EEXIST;
			goto err;
		}

		err = br_mdb_rehash(&br->mdb, max, elasticity);
		if (err) {
580 581 582 583
			br_warn(br, "Cannot rehash multicast "
				"hash table, disabling snooping: %s, %d, %d\n",
				port ? port->dev->name : br->dev->name,
				mdb->size, err);
584 585 586 587 588 589 590 591 592 593 594 595 596 597
			goto disable;
		}

		err = -EAGAIN;
		goto err;
	}

	return NULL;

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

598 599
struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
	struct net_bridge_port *port, struct br_ip *group)
600
{
601
	struct net_bridge_mdb_htable *mdb;
602 603
	struct net_bridge_mdb_entry *mp;
	int hash;
604
	int err;
605

606
	mdb = rcu_dereference_protected(br->mdb, 1);
607
	if (!mdb) {
608 609 610
		err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
		if (err)
			return ERR_PTR(err);
611 612 613 614 615 616 617 618 619 620 621
		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:
622
		mdb = rcu_dereference_protected(br->mdb, 1);
623 624 625 626 627 628 629 630 631
		hash = br_ip_hash(mdb, group);
		break;

	default:
		goto out;
	}

	mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
	if (unlikely(!mp))
632
		return ERR_PTR(-ENOMEM);
633 634

	mp->br = br;
635
	mp->addr = *group;
636 637 638
	setup_timer(&mp->timer, br_multicast_group_expired,
		    (unsigned long)mp);

639 640 641 642 643 644 645
	hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
	mdb->size++;

out:
	return mp;
}

646 647 648
struct net_bridge_port_group *br_multicast_new_port_group(
			struct net_bridge_port *port,
			struct br_ip *group,
649 650
			struct net_bridge_port_group __rcu *next,
			unsigned char state)
651 652 653 654 655 656 657 658 659
{
	struct net_bridge_port_group *p;

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

	p->addr = *group;
	p->port = port;
660
	p->state = state;
661
	rcu_assign_pointer(p->next, next);
662 663 664 665 666 667
	hlist_add_head(&p->mglist, &port->mglist);
	setup_timer(&p->timer, br_multicast_port_group_expired,
		    (unsigned long)p);
	return p;
}

668
static int br_multicast_add_group(struct net_bridge *br,
669 670
				  struct net_bridge_port *port,
				  struct br_ip *group)
671 672 673
{
	struct net_bridge_mdb_entry *mp;
	struct net_bridge_port_group *p;
674
	struct net_bridge_port_group __rcu **pp;
675
	unsigned long now = jiffies;
676 677 678 679 680 681 682 683 684
	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);
685
	if (IS_ERR(mp))
686 687 688
		goto err;

	if (!port) {
689
		mp->mglist = true;
690
		mod_timer(&mp->timer, now + br->multicast_membership_interval);
691 692 693
		goto out;
	}

694 695 696
	for (pp = &mp->ports;
	     (p = mlock_dereference(*pp, br)) != NULL;
	     pp = &p->next) {
697
		if (p->port == port)
698
			goto found;
699 700 701 702
		if ((unsigned long)p->port < (unsigned long)port)
			break;
	}

703
	p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
704 705 706
	if (unlikely(!p))
		goto err;
	rcu_assign_pointer(*pp, p);
C
Cong Wang 已提交
707
	br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
708

709 710
found:
	mod_timer(&p->timer, now + br->multicast_membership_interval);
711 712 713 714 715 716 717 718
out:
	err = 0;

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

719 720
static int br_ip4_multicast_add_group(struct net_bridge *br,
				      struct net_bridge_port *port,
721 722
				      __be32 group,
				      __u16 vid)
723 724 725 726 727 728 729 730
{
	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);
731
	br_group.vid = vid;
732 733 734 735

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

E
Eric Dumazet 已提交
736
#if IS_ENABLED(CONFIG_IPV6)
737 738
static int br_ip6_multicast_add_group(struct net_bridge *br,
				      struct net_bridge_port *port,
739 740
				      const struct in6_addr *group,
				      __u16 vid)
741 742 743
{
	struct br_ip br_group;

744
	if (ipv6_addr_is_ll_all_nodes(group))
745 746
		return 0;

A
Alexey Dobriyan 已提交
747
	br_group.u.ip6 = *group;
748
	br_group.proto = htons(ETH_P_IPV6);
749
	br_group.vid = vid;
750 751 752 753 754

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

755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775
static void br_multicast_router_expired(unsigned long data)
{
	struct net_bridge_port *port = (void *)data;
	struct net_bridge *br = port->br;

	spin_lock(&br->multicast_lock);
	if (port->multicast_router != 1 ||
	    timer_pending(&port->multicast_router_timer) ||
	    hlist_unhashed(&port->rlist))
		goto out;

	hlist_del_init_rcu(&port->rlist);

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

static void br_multicast_local_router_expired(unsigned long data)
{
}

776
static void br_multicast_querier_expired(struct net_bridge *br,
777
					 struct bridge_mcast_own_query *query)
778 779 780 781 782
{
	spin_lock(&br->multicast_lock);
	if (!netif_running(br->dev) || br->multicast_disabled)
		goto out;

783
	br_multicast_start_querier(br, query);
784 785 786 787 788

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

789 790 791 792
static void br_ip4_multicast_querier_expired(unsigned long data)
{
	struct net_bridge *br = (void *)data;

793
	br_multicast_querier_expired(br, &br->ip4_own_query);
794 795 796 797 798 799 800
}

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

801
	br_multicast_querier_expired(br, &br->ip6_own_query);
802 803 804
}
#endif

805 806 807 808 809 810 811 812 813 814 815 816
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
}

817 818 819
static void __br_multicast_send_query(struct net_bridge *br,
				      struct net_bridge_port *port,
				      struct br_ip *ip)
820 821 822
{
	struct sk_buff *skb;

823
	skb = br_multicast_alloc_query(br, ip);
824
	if (!skb)
825
		return;
826 827 828

	if (port) {
		skb->dev = port->dev;
829 830
		NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, NULL, skb,
			NULL, skb->dev,
831
			br_dev_queue_push_xmit);
832 833
	} else {
		br_multicast_select_own_querier(br, ip, skb);
834
		netif_rx(skb);
835
	}
836 837 838
}

static void br_multicast_send_query(struct net_bridge *br,
839
				    struct net_bridge_port *port,
840
				    struct bridge_mcast_own_query *own_query)
841 842 843
{
	unsigned long time;
	struct br_ip br_group;
844
	struct bridge_mcast_other_query *other_query = NULL;
845 846

	if (!netif_running(br->dev) || br->multicast_disabled ||
847
	    !br->multicast_querier)
848 849
		return;

850 851
	memset(&br_group.u, 0, sizeof(br_group.u));

852 853 854
	if (port ? (own_query == &port->ip4_own_query) :
		   (own_query == &br->ip4_own_query)) {
		other_query = &br->ip4_other_query;
855
		br_group.proto = htons(ETH_P_IP);
E
Eric Dumazet 已提交
856
#if IS_ENABLED(CONFIG_IPV6)
857
	} else {
858
		other_query = &br->ip6_other_query;
859
		br_group.proto = htons(ETH_P_IPV6);
860
#endif
861 862
	}

863
	if (!other_query || timer_pending(&other_query->timer))
864 865 866
		return;

	__br_multicast_send_query(br, port, &br_group);
867 868

	time = jiffies;
869
	time += own_query->startup_sent < br->multicast_startup_query_count ?
870 871
		br->multicast_startup_query_interval :
		br->multicast_query_interval;
872
	mod_timer(&own_query->timer, time);
873 874
}

875 876 877
static void
br_multicast_port_query_expired(struct net_bridge_port *port,
				struct bridge_mcast_own_query *query)
878 879 880 881
{
	struct net_bridge *br = port->br;

	spin_lock(&br->multicast_lock);
882 883
	if (port->state == BR_STATE_DISABLED ||
	    port->state == BR_STATE_BLOCKING)
884 885
		goto out;

886 887
	if (query->startup_sent < br->multicast_startup_query_count)
		query->startup_sent++;
888

889
	br_multicast_send_query(port->br, port, query);
890 891 892 893 894

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

895 896 897 898
static void br_ip4_multicast_port_query_expired(unsigned long data)
{
	struct net_bridge_port *port = (void *)data;

899
	br_multicast_port_query_expired(port, &port->ip4_own_query);
900 901 902 903 904 905 906
}

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

907
	br_multicast_port_query_expired(port, &port->ip6_own_query);
908 909 910
}
#endif

911 912 913 914 915 916
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);
917 918
	setup_timer(&port->ip4_own_query.timer,
		    br_ip4_multicast_port_query_expired, (unsigned long)port);
919
#if IS_ENABLED(CONFIG_IPV6)
920 921
	setup_timer(&port->ip6_own_query.timer,
		    br_ip6_multicast_port_query_expired, (unsigned long)port);
922
#endif
923 924 925 926 927 928 929
}

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

930
static void br_multicast_enable(struct bridge_mcast_own_query *query)
931
{
932
	query->startup_sent = 0;
933

934 935 936
	if (try_to_del_timer_sync(&query->timer) >= 0 ||
	    del_timer(&query->timer))
		mod_timer(&query->timer, jiffies);
937 938
}

939 940 941 942 943 944 945 946
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;

947
	br_multicast_enable(&port->ip4_own_query);
948
#if IS_ENABLED(CONFIG_IPV6)
949
	br_multicast_enable(&port->ip6_own_query);
950
#endif
951 952
	if (port->multicast_router == 2 && hlist_unhashed(&port->rlist))
		br_multicast_add_router(br, port);
953 954 955 956 957 958 959 960 961

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;
962
	struct hlist_node *n;
963 964

	spin_lock(&br->multicast_lock);
965
	hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
966 967 968 969 970
		br_multicast_del_pg(br, pg);

	if (!hlist_unhashed(&port->rlist))
		hlist_del_init_rcu(&port->rlist);
	del_timer(&port->multicast_router_timer);
971
	del_timer(&port->ip4_own_query.timer);
972
#if IS_ENABLED(CONFIG_IPV6)
973
	del_timer(&port->ip6_own_query.timer);
974
#endif
975 976 977
	spin_unlock(&br->multicast_lock);
}

978 979
static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
					 struct net_bridge_port *port,
980 981
					 struct sk_buff *skb,
					 u16 vid)
982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000
{
	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
1001
		grec = (void *)(skb->data + len - sizeof(*grec));
1002 1003 1004
		group = grec->grec_mca;
		type = grec->grec_type;

E
Eric Dumazet 已提交
1005
		len += ntohs(grec->grec_nsrcs) * 4;
1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022
		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;
		}

1023 1024 1025 1026 1027 1028 1029 1030 1031
		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;
		}
1032 1033 1034 1035 1036
	}

	return err;
}

E
Eric Dumazet 已提交
1037
#if IS_ENABLED(CONFIG_IPV6)
1038 1039
static int br_ip6_multicast_mld2_report(struct net_bridge *br,
					struct net_bridge_port *port,
1040 1041
					struct sk_buff *skb,
					u16 vid)
1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061
{
	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,
1062
							  grec_nsrcs),
1063 1064 1065 1066 1067 1068
					   sizeof(_nsrcs), &_nsrcs);
		if (!nsrcs)
			return -EINVAL;

		if (!pskb_may_pull(skb,
				   len + sizeof(*grec) +
1069
				   sizeof(struct in6_addr) * ntohs(*nsrcs)))
1070 1071 1072
			return -EINVAL;

		grec = (struct mld2_grec *)(skb->data + len);
1073 1074
		len += sizeof(*grec) +
		       sizeof(struct in6_addr) * ntohs(*nsrcs);
1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089

		/* 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;
		}

1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100
		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;
		}
1101 1102 1103 1104 1105 1106
	}

	return err;
}
#endif

1107
static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1108
					    struct net_bridge_port *port,
1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125
					    __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;

1126 1127 1128
	/* update protected by general multicast_lock by caller */
	rcu_assign_pointer(br->ip4_querier.port, port);

1129 1130 1131 1132 1133
	return true;
}

#if IS_ENABLED(CONFIG_IPV6)
static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1134
					    struct net_bridge_port *port,
1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148
					    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;

1149 1150 1151
	/* update protected by general multicast_lock by caller */
	rcu_assign_pointer(br->ip6_querier.port, port);

1152 1153 1154 1155 1156
	return true;
}
#endif

static bool br_multicast_select_querier(struct net_bridge *br,
1157
					struct net_bridge_port *port,
1158 1159 1160 1161
					struct br_ip *saddr)
{
	switch (saddr->proto) {
	case htons(ETH_P_IP):
1162
		return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1163 1164
#if IS_ENABLED(CONFIG_IPV6)
	case htons(ETH_P_IPV6):
1165
		return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1166 1167 1168 1169 1170 1171
#endif
	}

	return false;
}

1172
static void
1173 1174 1175
br_multicast_update_query_timer(struct net_bridge *br,
				struct bridge_mcast_other_query *query,
				unsigned long max_delay)
1176
{
1177 1178
	if (!timer_pending(&query->timer))
		query->delay_time = jiffies + max_delay;
1179

1180
	mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1181 1182
}

1183
/*
C
Cong Wang 已提交
1184
 * Add port to router_list
1185 1186 1187
 *  list is maintained ordered by pointer value
 *  and locked by br->multicast_lock and RCU
 */
1188 1189 1190
static void br_multicast_add_router(struct net_bridge *br,
				    struct net_bridge_port *port)
{
1191
	struct net_bridge_port *p;
1192
	struct hlist_node *slot = NULL;
1193

1194 1195 1196
	if (!hlist_unhashed(&port->rlist))
		return;

1197
	hlist_for_each_entry(p, &br->router_list, rlist) {
1198 1199
		if ((unsigned long) port >= (unsigned long) p)
			break;
1200
		slot = &p->rlist;
1201 1202
	}

1203
	if (slot)
1204
		hlist_add_behind_rcu(&port->rlist, slot);
1205 1206
	else
		hlist_add_head_rcu(&port->rlist, &br->router_list);
1207 1208
}

1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223
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;

1224
	br_multicast_add_router(br, port);
1225 1226 1227 1228 1229 1230 1231

	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,
1232
					struct bridge_mcast_other_query *query,
1233
					struct br_ip *saddr,
1234
					unsigned long max_delay)
1235
{
1236
	if (!br_multicast_select_querier(br, port, saddr))
1237 1238
		return;

1239
	br_multicast_update_query_timer(br, query, max_delay);
1240 1241 1242
	br_multicast_mark_router(br, port);
}

1243 1244
static int br_ip4_multicast_query(struct net_bridge *br,
				  struct net_bridge_port *port,
1245 1246
				  struct sk_buff *skb,
				  u16 vid)
1247
{
1248
	const struct iphdr *iph = ip_hdr(skb);
1249 1250 1251 1252
	struct igmphdr *ih = igmp_hdr(skb);
	struct net_bridge_mdb_entry *mp;
	struct igmpv3_query *ih3;
	struct net_bridge_port_group *p;
1253
	struct net_bridge_port_group __rcu **pp;
1254
	struct br_ip saddr;
1255 1256 1257
	unsigned long max_delay;
	unsigned long now = jiffies;
	__be32 group;
1258
	int err = 0;
1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273

	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;
		}
1274
	} else if (skb->len >= sizeof(*ih3)) {
1275 1276
		ih3 = igmpv3_query_hdr(skb);
		if (ih3->nsrcs)
1277
			goto out;
1278

1279 1280
		max_delay = ih3->code ?
			    IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1281
	} else {
1282 1283 1284
		goto out;
	}

1285 1286 1287
	if (!group) {
		saddr.proto = htons(ETH_P_IP);
		saddr.u.ip4 = iph->saddr;
1288

1289 1290
		br_multicast_query_received(br, port, &br->ip4_other_query,
					    &saddr, max_delay);
1291
		goto out;
1292
	}
1293

1294
	mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1295 1296 1297 1298 1299
	if (!mp)
		goto out;

	max_delay *= br->multicast_last_member_count;

1300
	if (mp->mglist &&
1301 1302 1303 1304 1305
	    (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);

1306 1307 1308
	for (pp = &mp->ports;
	     (p = mlock_dereference(*pp, br)) != NULL;
	     pp = &p->next) {
1309 1310 1311
		if (timer_pending(&p->timer) ?
		    time_after(p->timer.expires, now + max_delay) :
		    try_to_del_timer_sync(&p->timer) >= 0)
1312
			mod_timer(&p->timer, now + max_delay);
1313 1314 1315 1316
	}

out:
	spin_unlock(&br->multicast_lock);
1317
	return err;
1318 1319
}

E
Eric Dumazet 已提交
1320
#if IS_ENABLED(CONFIG_IPV6)
1321 1322
static int br_ip6_multicast_query(struct net_bridge *br,
				  struct net_bridge_port *port,
1323 1324
				  struct sk_buff *skb,
				  u16 vid)
1325
{
1326
	const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1327
	struct mld_msg *mld;
1328 1329
	struct net_bridge_mdb_entry *mp;
	struct mld2_query *mld2q;
1330 1331
	struct net_bridge_port_group *p;
	struct net_bridge_port_group __rcu **pp;
1332
	struct br_ip saddr;
1333 1334
	unsigned long max_delay;
	unsigned long now = jiffies;
1335
	const struct in6_addr *group = NULL;
1336
	bool is_general_query;
1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349
	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
1350
		max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1351 1352
		if (max_delay)
			group = &mld->mld_mca;
1353
	} else {
1354 1355 1356 1357 1358 1359 1360
		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;
1361 1362

		max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1363 1364
	}

1365 1366
	is_general_query = group && ipv6_addr_any(group);

1367 1368 1369
	if (is_general_query) {
		saddr.proto = htons(ETH_P_IPV6);
		saddr.u.ip6 = ip6h->saddr;
1370

1371 1372
		br_multicast_query_received(br, port, &br->ip6_other_query,
					    &saddr, max_delay);
1373
		goto out;
1374 1375
	} else if (!group) {
		goto out;
1376
	}
1377

1378
	mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1379 1380 1381 1382
	if (!mp)
		goto out;

	max_delay *= br->multicast_last_member_count;
1383
	if (mp->mglist &&
1384 1385 1386 1387 1388
	    (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);

1389 1390 1391
	for (pp = &mp->ports;
	     (p = mlock_dereference(*pp, br)) != NULL;
	     pp = &p->next) {
1392 1393 1394
		if (timer_pending(&p->timer) ?
		    time_after(p->timer.expires, now + max_delay) :
		    try_to_del_timer_sync(&p->timer) >= 0)
1395
			mod_timer(&p->timer, now + max_delay);
1396 1397 1398 1399 1400 1401 1402 1403
	}

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

1404 1405 1406 1407 1408 1409
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)
1410 1411 1412 1413 1414 1415 1416 1417 1418
{
	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) ||
1419
	    (port && port->state == BR_STATE_DISABLED))
1420 1421
		goto out;

1422
	mdb = mlock_dereference(br->mdb, br);
1423 1424 1425 1426
	mp = br_mdb_ip_get(mdb, group);
	if (!mp)
		goto out;

1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451
	if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
		struct net_bridge_port_group __rcu **pp;

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

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

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

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

1452
	if (br->multicast_querier) {
1453 1454 1455 1456
		__br_multicast_send_query(br, port, &mp->addr);

		time = jiffies + br->multicast_last_member_count *
				 br->multicast_last_member_interval;
1457

1458
		mod_timer(&own_query->timer, time);
1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476

		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;
		}
	}

1477 1478 1479 1480 1481
	now = jiffies;
	time = now + br->multicast_last_member_count *
		     br->multicast_last_member_interval;

	if (!port) {
1482
		if (mp->mglist &&
1483 1484 1485 1486 1487
		    (timer_pending(&mp->timer) ?
		     time_after(mp->timer.expires, time) :
		     try_to_del_timer_sync(&mp->timer) >= 0)) {
			mod_timer(&mp->timer, time);
		}
1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505

		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;
1506 1507 1508 1509 1510
	}
out:
	spin_unlock(&br->multicast_lock);
}

1511 1512
static void br_ip4_multicast_leave_group(struct net_bridge *br,
					 struct net_bridge_port *port,
1513 1514
					 __be32 group,
					 __u16 vid)
1515 1516
{
	struct br_ip br_group;
1517
	struct bridge_mcast_own_query *own_query;
1518 1519 1520 1521

	if (ipv4_is_local_multicast(group))
		return;

1522 1523
	own_query = port ? &port->ip4_own_query : &br->ip4_own_query;

1524 1525
	br_group.u.ip4 = group;
	br_group.proto = htons(ETH_P_IP);
1526
	br_group.vid = vid;
1527

1528 1529
	br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
				 own_query);
1530 1531
}

E
Eric Dumazet 已提交
1532
#if IS_ENABLED(CONFIG_IPV6)
1533 1534
static void br_ip6_multicast_leave_group(struct net_bridge *br,
					 struct net_bridge_port *port,
1535 1536
					 const struct in6_addr *group,
					 __u16 vid)
1537 1538
{
	struct br_ip br_group;
1539
	struct bridge_mcast_own_query *own_query;
1540

1541
	if (ipv6_addr_is_ll_all_nodes(group))
1542 1543
		return;

1544 1545
	own_query = port ? &port->ip6_own_query : &br->ip6_own_query;

A
Alexey Dobriyan 已提交
1546
	br_group.u.ip6 = *group;
1547
	br_group.proto = htons(ETH_P_IPV6);
1548
	br_group.vid = vid;
1549

1550 1551
	br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
				 own_query);
1552 1553
}
#endif
1554

1555 1556
static int br_multicast_ipv4_rcv(struct net_bridge *br,
				 struct net_bridge_port *port,
1557 1558
				 struct sk_buff *skb,
				 u16 vid)
1559
{
1560
	struct sk_buff *skb_trimmed = NULL;
1561 1562 1563
	struct igmphdr *ih;
	int err;

1564
	err = ip_mc_check_igmp(skb, &skb_trimmed);
1565

1566 1567
	if (err == -ENOMSG) {
		if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
1568
			BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1569
		return 0;
1570 1571
	} else if (err < 0) {
		return err;
1572
	}
1573 1574

	BR_INPUT_SKB_CB(skb)->igmp = 1;
1575
	ih = igmp_hdr(skb);
1576 1577 1578 1579

	switch (ih->type) {
	case IGMP_HOST_MEMBERSHIP_REPORT:
	case IGMPV2_HOST_MEMBERSHIP_REPORT:
1580
		BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1581
		err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1582 1583
		break;
	case IGMPV3_HOST_MEMBERSHIP_REPORT:
1584
		err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1585 1586
		break;
	case IGMP_HOST_MEMBERSHIP_QUERY:
1587
		err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1588 1589
		break;
	case IGMP_HOST_LEAVE_MESSAGE:
1590
		br_ip4_multicast_leave_group(br, port, ih->group, vid);
1591 1592 1593
		break;
	}

1594 1595 1596
	if (skb_trimmed)
		kfree_skb(skb_trimmed);

1597 1598 1599
	return err;
}

E
Eric Dumazet 已提交
1600
#if IS_ENABLED(CONFIG_IPV6)
1601 1602
static int br_multicast_ipv6_rcv(struct net_bridge *br,
				 struct net_bridge_port *port,
1603 1604
				 struct sk_buff *skb,
				 u16 vid)
1605
{
1606 1607
	struct sk_buff *skb_trimmed = NULL;
	struct mld_msg *mld;
1608 1609
	int err;

1610
	err = ipv6_mc_check_mld(skb, &skb_trimmed);
1611

1612 1613 1614
	if (err == -ENOMSG) {
		if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
			BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1615
		return 0;
1616 1617
	} else if (err < 0) {
		return err;
1618 1619 1620
	}

	BR_INPUT_SKB_CB(skb)->igmp = 1;
1621
	mld = (struct mld_msg *)skb_transport_header(skb);
1622

1623
	switch (mld->mld_type) {
1624
	case ICMPV6_MGM_REPORT:
1625
		BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1626
		err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1627 1628
		break;
	case ICMPV6_MLD2_REPORT:
1629
		err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1630 1631
		break;
	case ICMPV6_MGM_QUERY:
1632
		err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1633 1634
		break;
	case ICMPV6_MGM_REDUCTION:
1635
		br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1636
		break;
1637 1638
	}

1639 1640 1641
	if (skb_trimmed)
		kfree_skb(skb_trimmed);

1642 1643 1644 1645
	return err;
}
#endif

1646
int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1647
		     struct sk_buff *skb, u16 vid)
1648
{
1649 1650 1651
	BR_INPUT_SKB_CB(skb)->igmp = 0;
	BR_INPUT_SKB_CB(skb)->mrouters_only = 0;

1652 1653 1654 1655 1656
	if (br->multicast_disabled)
		return 0;

	switch (skb->protocol) {
	case htons(ETH_P_IP):
1657
		return br_multicast_ipv4_rcv(br, port, skb, vid);
E
Eric Dumazet 已提交
1658
#if IS_ENABLED(CONFIG_IPV6)
1659
	case htons(ETH_P_IPV6):
1660
		return br_multicast_ipv6_rcv(br, port, skb, vid);
1661
#endif
1662 1663 1664 1665 1666
	}

	return 0;
}

1667
static void br_multicast_query_expired(struct net_bridge *br,
1668 1669
				       struct bridge_mcast_own_query *query,
				       struct bridge_mcast_querier *querier)
1670 1671 1672 1673 1674
{
	spin_lock(&br->multicast_lock);
	if (query->startup_sent < br->multicast_startup_query_count)
		query->startup_sent++;

1675
	RCU_INIT_POINTER(querier->port, NULL);
1676 1677 1678 1679 1680
	br_multicast_send_query(br, NULL, query);
	spin_unlock(&br->multicast_lock);
}

static void br_ip4_multicast_query_expired(unsigned long data)
1681 1682 1683
{
	struct net_bridge *br = (void *)data;

1684
	br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1685
}
1686

1687 1688 1689 1690
#if IS_ENABLED(CONFIG_IPV6)
static void br_ip6_multicast_query_expired(unsigned long data)
{
	struct net_bridge *br = (void *)data;
1691

1692
	br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1693
}
1694
#endif
1695 1696 1697 1698 1699 1700 1701

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

	br->multicast_router = 1;
1702
	br->multicast_querier = 0;
1703
	br->multicast_query_use_ifaddr = 0;
1704 1705 1706 1707 1708 1709 1710 1711 1712 1713
	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;

1714
	br->ip4_other_query.delay_time = 0;
1715
	br->ip4_querier.port = NULL;
1716
#if IS_ENABLED(CONFIG_IPV6)
1717
	br->ip6_other_query.delay_time = 0;
1718
	br->ip6_querier.port = NULL;
1719
#endif
1720

1721 1722 1723
	spin_lock_init(&br->multicast_lock);
	setup_timer(&br->multicast_router_timer,
		    br_multicast_local_router_expired, 0);
1724 1725 1726
	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,
1727
		    (unsigned long)br);
1728
#if IS_ENABLED(CONFIG_IPV6)
1729 1730 1731
	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,
1732 1733
		    (unsigned long)br);
#endif
1734 1735
}

1736
static void __br_multicast_open(struct net_bridge *br,
1737
				struct bridge_mcast_own_query *query)
1738
{
1739
	query->startup_sent = 0;
1740 1741 1742 1743

	if (br->multicast_disabled)
		return;

1744 1745 1746 1747 1748
	mod_timer(&query->timer, jiffies);
}

void br_multicast_open(struct net_bridge *br)
{
1749
	__br_multicast_open(br, &br->ip4_own_query);
1750
#if IS_ENABLED(CONFIG_IPV6)
1751
	__br_multicast_open(br, &br->ip6_own_query);
1752
#endif
1753 1754 1755 1756 1757 1758
}

void br_multicast_stop(struct net_bridge *br)
{
	struct net_bridge_mdb_htable *mdb;
	struct net_bridge_mdb_entry *mp;
1759
	struct hlist_node *n;
1760 1761 1762 1763
	u32 ver;
	int i;

	del_timer_sync(&br->multicast_router_timer);
1764 1765
	del_timer_sync(&br->ip4_other_query.timer);
	del_timer_sync(&br->ip4_own_query.timer);
1766
#if IS_ENABLED(CONFIG_IPV6)
1767 1768
	del_timer_sync(&br->ip6_other_query.timer);
	del_timer_sync(&br->ip6_own_query.timer);
1769
#endif
1770 1771

	spin_lock_bh(&br->multicast_lock);
1772
	mdb = mlock_dereference(br->mdb, br);
1773 1774 1775 1776 1777 1778 1779
	if (!mdb)
		goto out;

	br->mdb = NULL;

	ver = mdb->ver;
	for (i = 0; i < mdb->max; i++) {
1780
		hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1781 1782 1783 1784 1785 1786 1787 1788
					  hlist[ver]) {
			del_timer(&mp->timer);
			call_rcu_bh(&mp->rcu, br_multicast_free_group);
		}
	}

	if (mdb->old) {
		spin_unlock_bh(&br->multicast_lock);
1789
		rcu_barrier_bh();
1790 1791 1792 1793 1794 1795 1796 1797 1798 1799
		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);
}
1800 1801 1802

int br_multicast_set_router(struct net_bridge *br, unsigned long val)
{
1803
	int err = -EINVAL;
1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825

	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;
1826
	int err = -EINVAL;
1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855

	spin_lock(&br->multicast_lock);

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

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

		if (val == 1)
			break;

		del_timer(&p->multicast_router_timer);

		if (val == 0)
			break;

		br_multicast_add_router(br, p);
		break;
	}

	spin_unlock(&br->multicast_lock);

	return err;
}
1856

1857
static void br_multicast_start_querier(struct net_bridge *br,
1858
				       struct bridge_mcast_own_query *query)
1859 1860
{
	struct net_bridge_port *port;
1861

1862
	__br_multicast_open(br, query);
1863 1864 1865 1866 1867 1868

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

1869 1870
		if (query == &br->ip4_own_query)
			br_multicast_enable(&port->ip4_own_query);
1871 1872
#if IS_ENABLED(CONFIG_IPV6)
		else
1873
			br_multicast_enable(&port->ip6_own_query);
1874
#endif
1875 1876 1877 1878 1879
	}
}

int br_multicast_toggle(struct net_bridge *br, unsigned long val)
{
1880
	int err = 0;
1881
	struct net_bridge_mdb_htable *mdb;
1882

1883
	spin_lock_bh(&br->multicast_lock);
1884 1885 1886 1887 1888 1889 1890
	if (br->multicast_disabled == !val)
		goto unlock;

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

1891 1892 1893
	if (!netif_running(br->dev))
		goto unlock;

1894 1895 1896
	mdb = mlock_dereference(br->mdb, br);
	if (mdb) {
		if (mdb->old) {
1897 1898 1899 1900 1901 1902
			err = -EEXIST;
rollback:
			br->multicast_disabled = !!val;
			goto unlock;
		}

1903
		err = br_mdb_rehash(&br->mdb, mdb->max,
1904 1905 1906 1907 1908
				    br->hash_elasticity);
		if (err)
			goto rollback;
	}

1909
	br_multicast_start_querier(br, &br->ip4_own_query);
1910
#if IS_ENABLED(CONFIG_IPV6)
1911
	br_multicast_start_querier(br, &br->ip6_own_query);
1912
#endif
1913 1914

unlock:
1915
	spin_unlock_bh(&br->multicast_lock);
1916 1917 1918

	return err;
}
1919

1920 1921
int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
{
1922 1923
	unsigned long max_delay;

1924 1925 1926 1927 1928 1929 1930
	val = !!val;

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

	br->multicast_querier = val;
1931 1932 1933 1934 1935
	if (!val)
		goto unlock;

	max_delay = br->multicast_query_response_interval;

1936 1937
	if (!timer_pending(&br->ip4_other_query.timer))
		br->ip4_other_query.delay_time = jiffies + max_delay;
1938

1939
	br_multicast_start_querier(br, &br->ip4_own_query);
1940 1941

#if IS_ENABLED(CONFIG_IPV6)
1942 1943
	if (!timer_pending(&br->ip6_other_query.timer))
		br->ip6_other_query.delay_time = jiffies + max_delay;
1944

1945
	br_multicast_start_querier(br, &br->ip6_own_query);
1946
#endif
1947 1948 1949 1950 1951 1952 1953

unlock:
	spin_unlock_bh(&br->multicast_lock);

	return 0;
}

1954 1955
int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
{
1956
	int err = -EINVAL;
1957
	u32 old;
1958
	struct net_bridge_mdb_htable *mdb;
1959

1960
	spin_lock_bh(&br->multicast_lock);
1961 1962
	if (!is_power_of_2(val))
		goto unlock;
1963 1964 1965

	mdb = mlock_dereference(br->mdb, br);
	if (mdb && val < mdb->size)
1966 1967 1968 1969 1970 1971 1972
		goto unlock;

	err = 0;

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

1973 1974
	if (mdb) {
		if (mdb->old) {
1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987
			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:
1988
	spin_unlock_bh(&br->multicast_lock);
1989 1990 1991

	return err;
}
1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 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

/**
 * 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);
2049

2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086
/**
 * 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);

2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117
/**
 * 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;
2118
#if IS_ENABLED(CONFIG_IPV6)
2119 2120 2121 2122 2123
	case ETH_P_IPV6:
		if (!timer_pending(&br->ip6_other_query.timer) ||
		    rcu_dereference(br->ip6_querier.port) == port)
			goto unlock;
		break;
2124
#endif
2125 2126 2127 2128 2129 2130 2131 2132 2133 2134
	default:
		goto unlock;
	}

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