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[mirror_ubuntu-artful-kernel.git] / net / bridge / br_multicast.c
CommitLineData
eb1d1641
HX		 1/*
2 * Bridge multicast support.
3 *
4 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13#include <linux/err.h>
14#include <linux/if_ether.h>
15#include <linux/igmp.h>
16#include <linux/jhash.h>
17#include <linux/kernel.h>
b195167f 18#include <linux/log2.h>
eb1d1641
HX		 19#include <linux/netdevice.h>
20#include <linux/netfilter_bridge.h>
21#include <linux/random.h>
22#include <linux/rculist.h>
23#include <linux/skbuff.h>
24#include <linux/slab.h>
25#include <linux/timer.h>
26#include <net/ip.h>
dfd56b8b 27#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 28#include <net/ipv6.h>
29#include <net/mld.h>
30#include <net/addrconf.h>
d4c4f07d 31#include <net/ip6_checksum.h>
08b202b6 32#endif
eb1d1641
HX		 33
34#include "br_private.h"
35
e8051688
ED		 36#define mlock_dereference(X, br) \
37 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
38
c83b8fab 39static void br_multicast_start_querier(struct net_bridge *br);
2ce297fc 40unsigned int br_mdb_rehash_seq;
c83b8fab 41
dfd56b8b 42#if IS_ENABLED(CONFIG_IPV6)
e4de9f9e 43static inline int ipv6_is_transient_multicast(const struct in6_addr *addr)
eb1d1641 44{
e4de9f9e 45 if (ipv6_addr_is_multicast(addr) && IPV6_ADDR_MC_FLAG_TRANSIENT(addr))
08b202b6
YH		 46 return 1;
47 return 0;
48}
49#endif
50
8ef2a9a5
YH		 51static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
52{
53 if (a->proto != b->proto)
54 return 0;
55 switch (a->proto) {
56 case htons(ETH_P_IP):
57 return a->u.ip4 == b->u.ip4;
dfd56b8b 58#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 59 case htons(ETH_P_IPV6):
60 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
61#endif
8ef2a9a5
YH		 62 }
63 return 0;
64}
65
66static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip)
eb1d1641 67{
0eae88f3 68 return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1);
eb1d1641
HX		 69}
70
dfd56b8b 71#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 72static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
73 const struct in6_addr *ip)
74{
75 return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1);
76}
77#endif
78
8ef2a9a5
YH		 79static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
80 struct br_ip *ip)
81{
82 switch (ip->proto) {
83 case htons(ETH_P_IP):
84 return __br_ip4_hash(mdb, ip->u.ip4);
dfd56b8b 85#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 86 case htons(ETH_P_IPV6):
87 return __br_ip6_hash(mdb, &ip->u.ip6);
88#endif
8ef2a9a5
YH		 89 }
90 return 0;
eb1d1641
HX		 91}
92
93static struct net_bridge_mdb_entry *__br_mdb_ip_get(
8ef2a9a5 94 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
eb1d1641
HX		 95{
96 struct net_bridge_mdb_entry *mp;
97 struct hlist_node *p;
98
49f5fcfd 99 hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
8ef2a9a5 100 if (br_ip_equal(&mp->addr, dst))
eb1d1641
HX		 101 return mp;
102 }
103
104 return NULL;
105}
106
7f285fa7
HX		 107static struct net_bridge_mdb_entry *br_mdb_ip_get(
108 struct net_bridge_mdb_htable *mdb, struct br_ip *dst)
109{
110 if (!mdb)
111 return NULL;
112
113 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
114}
115
8ef2a9a5 116static struct net_bridge_mdb_entry *br_mdb_ip4_get(
eb1d1641
HX		 117 struct net_bridge_mdb_htable *mdb, __be32 dst)
118{
8ef2a9a5
YH		 119 struct br_ip br_dst;
120
121 br_dst.u.ip4 = dst;
122 br_dst.proto = htons(ETH_P_IP);
0821ec55 123
7f285fa7 124 return br_mdb_ip_get(mdb, &br_dst);
8ef2a9a5
YH		 125}
126
dfd56b8b 127#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 128static struct net_bridge_mdb_entry *br_mdb_ip6_get(
129 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst)
130{
131 struct br_ip br_dst;
0821ec55 132
4e3fd7a0 133 br_dst.u.ip6 = *dst;
08b202b6
YH		 134 br_dst.proto = htons(ETH_P_IPV6);
135
7f285fa7 136 return br_mdb_ip_get(mdb, &br_dst);
08b202b6
YH		 137}
138#endif
139
eb1d1641
HX		 140struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
141 struct sk_buff *skb)
142{
e8051688 143 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
8ef2a9a5
YH		 144 struct br_ip ip;
145
7f285fa7 146 if (br->multicast_disabled)
eb1d1641
HX		 147 return NULL;
148
8ef2a9a5 149 if (BR_INPUT_SKB_CB(skb)->igmp)
eb1d1641
HX		 150 return NULL;
151
8ef2a9a5
YH		 152 ip.proto = skb->protocol;
153
eb1d1641
HX		 154 switch (skb->protocol) {
155 case htons(ETH_P_IP):
8ef2a9a5
YH		 156 ip.u.ip4 = ip_hdr(skb)->daddr;
157 break;
dfd56b8b 158#if IS_ENABLED(CONFIG_IPV6)
08b202b6 159 case htons(ETH_P_IPV6):
4e3fd7a0 160 ip.u.ip6 = ipv6_hdr(skb)->daddr;
08b202b6
YH		 161 break;
162#endif
8ef2a9a5
YH		 163 default:
164 return NULL;
eb1d1641
HX		 165 }
166
8ef2a9a5 167 return br_mdb_ip_get(mdb, &ip);
eb1d1641
HX		 168}
169
170static void br_mdb_free(struct rcu_head *head)
171{
172 struct net_bridge_mdb_htable *mdb =
173 container_of(head, struct net_bridge_mdb_htable, rcu);
174 struct net_bridge_mdb_htable *old = mdb->old;
175
176 mdb->old = NULL;
177 kfree(old->mhash);
178 kfree(old);
179}
180
181static int br_mdb_copy(struct net_bridge_mdb_htable *new,
182 struct net_bridge_mdb_htable *old,
183 int elasticity)
184{
185 struct net_bridge_mdb_entry *mp;
186 struct hlist_node *p;
187 int maxlen;
188 int len;
189 int i;
190
191 for (i = 0; i < old->max; i++)
192 hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver])
193 hlist_add_head(&mp->hlist[new->ver],
8ef2a9a5 194 &new->mhash[br_ip_hash(new, &mp->addr)]);
eb1d1641
HX		 195
196 if (!elasticity)
197 return 0;
198
199 maxlen = 0;
200 for (i = 0; i < new->max; i++) {
201 len = 0;
202 hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver])
203 len++;
204 if (len > maxlen)
205 maxlen = len;
206 }
207
208 return maxlen > elasticity ? -EINVAL : 0;
209}
210
211static void br_multicast_free_pg(struct rcu_head *head)
212{
213 struct net_bridge_port_group *p =
214 container_of(head, struct net_bridge_port_group, rcu);
215
216 kfree(p);
217}
218
219static void br_multicast_free_group(struct rcu_head *head)
220{
221 struct net_bridge_mdb_entry *mp =
222 container_of(head, struct net_bridge_mdb_entry, rcu);
223
224 kfree(mp);
225}
226
227static void br_multicast_group_expired(unsigned long data)
228{
229 struct net_bridge_mdb_entry *mp = (void *)data;
230 struct net_bridge *br = mp->br;
231 struct net_bridge_mdb_htable *mdb;
232
233 spin_lock(&br->multicast_lock);
234 if (!netif_running(br->dev) || timer_pending(&mp->timer))
235 goto out;
236
8a870178 237 mp->mglist = false;
eb1d1641
HX		 238
239 if (mp->ports)
240 goto out;
241
e8051688
ED		 242 mdb = mlock_dereference(br->mdb, br);
243
eb1d1641
HX		 244 hlist_del_rcu(&mp->hlist[mdb->ver]);
245 mdb->size--;
246
eb1d1641
HX		 247 call_rcu_bh(&mp->rcu, br_multicast_free_group);
248
249out:
250 spin_unlock(&br->multicast_lock);
251}
252
253static void br_multicast_del_pg(struct net_bridge *br,
254 struct net_bridge_port_group *pg)
255{
e8051688 256 struct net_bridge_mdb_htable *mdb;
eb1d1641
HX		 257 struct net_bridge_mdb_entry *mp;
258 struct net_bridge_port_group *p;
e8051688
ED		 259 struct net_bridge_port_group __rcu **pp;
260
261 mdb = mlock_dereference(br->mdb, br);
eb1d1641 262
8ef2a9a5 263 mp = br_mdb_ip_get(mdb, &pg->addr);
eb1d1641
HX		 264 if (WARN_ON(!mp))
265 return;
266
e8051688
ED		 267 for (pp = &mp->ports;
268 (p = mlock_dereference(*pp, br)) != NULL;
269 pp = &p->next) {
eb1d1641
HX		 270 if (p != pg)
271 continue;
272
83f6a740 273 rcu_assign_pointer(*pp, p->next);
eb1d1641
HX		 274 hlist_del_init(&p->mglist);
275 del_timer(&p->timer);
eb1d1641
HX		 276 call_rcu_bh(&p->rcu, br_multicast_free_pg);
277
8a870178 278 if (!mp->ports && !mp->mglist &&
eb1d1641
HX		 279 netif_running(br->dev))
280 mod_timer(&mp->timer, jiffies);
281
282 return;
283 }
284
285 WARN_ON(1);
286}
287
288static void br_multicast_port_group_expired(unsigned long data)
289{
290 struct net_bridge_port_group *pg = (void *)data;
291 struct net_bridge *br = pg->port->br;
292
293 spin_lock(&br->multicast_lock);
294 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
295 hlist_unhashed(&pg->mglist))
296 goto out;
297
298 br_multicast_del_pg(br, pg);
299
300out:
301 spin_unlock(&br->multicast_lock);
302}
303
e8051688 304static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
eb1d1641
HX		 305 int elasticity)
306{
e8051688 307 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
eb1d1641
HX		 308 struct net_bridge_mdb_htable *mdb;
309 int err;
310
311 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
312 if (!mdb)
313 return -ENOMEM;
314
315 mdb->max = max;
316 mdb->old = old;
317
318 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
319 if (!mdb->mhash) {
320 kfree(mdb);
321 return -ENOMEM;
322 }
323
324 mdb->size = old ? old->size : 0;
325 mdb->ver = old ? old->ver ^ 1 : 0;
326
327 if (!old || elasticity)
328 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
329 else
330 mdb->secret = old->secret;
331
332 if (!old)
333 goto out;
334
335 err = br_mdb_copy(mdb, old, elasticity);
336 if (err) {
337 kfree(mdb->mhash);
338 kfree(mdb);
339 return err;
340 }
341
2ce297fc 342 br_mdb_rehash_seq++;
eb1d1641
HX		 343 call_rcu_bh(&mdb->rcu, br_mdb_free);
344
345out:
346 rcu_assign_pointer(*mdbp, mdb);
347
348 return 0;
349}
350
8ef2a9a5
YH		 351static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
352 __be32 group)
eb1d1641
HX		 353{
354 struct sk_buff *skb;
355 struct igmphdr *ih;
356 struct ethhdr *eth;
357 struct iphdr *iph;
358
359 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
360 sizeof(*ih) + 4);
361 if (!skb)
362 goto out;
363
364 skb->protocol = htons(ETH_P_IP);
365
366 skb_reset_mac_header(skb);
367 eth = eth_hdr(skb);
368
369 memcpy(eth->h_source, br->dev->dev_addr, 6);
370 eth->h_dest[0] = 1;
371 eth->h_dest[1] = 0;
372 eth->h_dest[2] = 0x5e;
373 eth->h_dest[3] = 0;
374 eth->h_dest[4] = 0;
375 eth->h_dest[5] = 1;
376 eth->h_proto = htons(ETH_P_IP);
377 skb_put(skb, sizeof(*eth));
378
379 skb_set_network_header(skb, skb->len);
380 iph = ip_hdr(skb);
381
382 iph->version = 4;
383 iph->ihl = 6;
384 iph->tos = 0xc0;
385 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
386 iph->id = 0;
387 iph->frag_off = htons(IP_DF);
388 iph->ttl = 1;
389 iph->protocol = IPPROTO_IGMP;
390 iph->saddr = 0;
391 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
392 ((u8 *)&iph[1])[0] = IPOPT_RA;
393 ((u8 *)&iph[1])[1] = 4;
394 ((u8 *)&iph[1])[2] = 0;
395 ((u8 *)&iph[1])[3] = 0;
396 ip_send_check(iph);
397 skb_put(skb, 24);
398
399 skb_set_transport_header(skb, skb->len);
400 ih = igmp_hdr(skb);
401 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
402 ih->code = (group ? br->multicast_last_member_interval :
403 br->multicast_query_response_interval) /
404 (HZ / IGMP_TIMER_SCALE);
405 ih->group = group;
406 ih->csum = 0;
407 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
408 skb_put(skb, sizeof(*ih));
409
410 __skb_pull(skb, sizeof(*eth));
411
412out:
413 return skb;
414}
415
dfd56b8b 416#if IS_ENABLED(CONFIG_IPV6)
08b202b6 417static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
b71d1d42 418 const struct in6_addr *group)
08b202b6
YH		 419{
420 struct sk_buff *skb;
421 struct ipv6hdr *ip6h;
422 struct mld_msg *mldq;
423 struct ethhdr *eth;
424 u8 *hopopt;
425 unsigned long interval;
426
427 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
428 8 + sizeof(*mldq));
429 if (!skb)
430 goto out;
431
432 skb->protocol = htons(ETH_P_IPV6);
433
434 /* Ethernet header */
435 skb_reset_mac_header(skb);
436 eth = eth_hdr(skb);
437
438 memcpy(eth->h_source, br->dev->dev_addr, 6);
08b202b6
YH		 439 eth->h_proto = htons(ETH_P_IPV6);
440 skb_put(skb, sizeof(*eth));
441
442 /* IPv6 header + HbH option */
443 skb_set_network_header(skb, skb->len);
444 ip6h = ipv6_hdr(skb);
445
446 *(__force __be32 *)ip6h = htonl(0x60000000);
76d66158 447 ip6h->payload_len = htons(8 + sizeof(*mldq));
08b202b6
YH		 448 ip6h->nexthdr = IPPROTO_HOPOPTS;
449 ip6h->hop_limit = 1;
a7bff75b 450 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
d1d81d4c
UW		 451 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
452 &ip6h->saddr)) {
453 kfree_skb(skb);
454 return NULL;
455 }
36cff5a1 456 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
08b202b6
YH		 457
458 hopopt = (u8 *)(ip6h + 1);
459 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
460 hopopt[1] = 0; /* length of HbH */
461 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
462 hopopt[3] = 2; /* Length of RA Option */
463 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
464 hopopt[5] = 0;
1de5a71c
EZ		 465 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
466 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
08b202b6
YH		 467
468 skb_put(skb, sizeof(*ip6h) + 8);
469
470 /* ICMPv6 */
471 skb_set_transport_header(skb, skb->len);
472 mldq = (struct mld_msg *) icmp6_hdr(skb);
473
474 interval = ipv6_addr_any(group) ? br->multicast_last_member_interval :
475 br->multicast_query_response_interval;
476
477 mldq->mld_type = ICMPV6_MGM_QUERY;
478 mldq->mld_code = 0;
479 mldq->mld_cksum = 0;
480 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
481 mldq->mld_reserved = 0;
4e3fd7a0 482 mldq->mld_mca = *group;
08b202b6
YH		 483
484 /* checksum */
485 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
486 sizeof(*mldq), IPPROTO_ICMPV6,
487 csum_partial(mldq,
488 sizeof(*mldq), 0));
489 skb_put(skb, sizeof(*mldq));
490
491 __skb_pull(skb, sizeof(*eth));
492
493out:
494 return skb;
495}
496#endif
497
8ef2a9a5
YH		 498static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
499 struct br_ip *addr)
500{
501 switch (addr->proto) {
502 case htons(ETH_P_IP):
503 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
dfd56b8b 504#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 505 case htons(ETH_P_IPV6):
506 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
507#endif
8ef2a9a5
YH		 508 }
509 return NULL;
510}
511
eb1d1641 512static struct net_bridge_mdb_entry *br_multicast_get_group(
8ef2a9a5
YH		 513 struct net_bridge *br, struct net_bridge_port *port,
514 struct br_ip *group, int hash)
eb1d1641 515{
e8051688 516 struct net_bridge_mdb_htable *mdb;
eb1d1641
HX		 517 struct net_bridge_mdb_entry *mp;
518 struct hlist_node *p;
95c96174
ED		 519 unsigned int count = 0;
520 unsigned int max;
eb1d1641
HX		 521 int elasticity;
522 int err;
523
e8051688 524 mdb = rcu_dereference_protected(br->mdb, 1);
eb1d1641
HX		 525 hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
526 count++;
8ef2a9a5 527 if (unlikely(br_ip_equal(group, &mp->addr)))
eb1d1641 528 return mp;
eb1d1641
HX		 529 }
530
531 elasticity = 0;
532 max = mdb->max;
533
534 if (unlikely(count > br->hash_elasticity && count)) {
535 if (net_ratelimit())
28a16c97 536 br_info(br, "Multicast hash table "
537 "chain limit reached: %s\n",
538 port ? port->dev->name : br->dev->name);
eb1d1641
HX		 539
540 elasticity = br->hash_elasticity;
541 }
542
543 if (mdb->size >= max) {
544 max *= 2;
036be6db
TG		 545 if (unlikely(max > br->hash_max)) {
546 br_warn(br, "Multicast hash table maximum of %d "
547 "reached, disabling snooping: %s\n",
548 br->hash_max,
549 port ? port->dev->name : br->dev->name);
eb1d1641
HX		 550 err = -E2BIG;
551disable:
552 br->multicast_disabled = 1;
553 goto err;
554 }
555 }
556
557 if (max > mdb->max || elasticity) {
558 if (mdb->old) {
559 if (net_ratelimit())
28a16c97 560 br_info(br, "Multicast hash table "
561 "on fire: %s\n",
562 port ? port->dev->name : br->dev->name);
eb1d1641
HX		 563 err = -EEXIST;
564 goto err;
565 }
566
567 err = br_mdb_rehash(&br->mdb, max, elasticity);
568 if (err) {
28a16c97 569 br_warn(br, "Cannot rehash multicast "
570 "hash table, disabling snooping: %s, %d, %d\n",
571 port ? port->dev->name : br->dev->name,
572 mdb->size, err);
eb1d1641
HX		 573 goto disable;
574 }
575
576 err = -EAGAIN;
577 goto err;
578 }
579
580 return NULL;
581
582err:
583 mp = ERR_PTR(err);
584 return mp;
585}
586
587static struct net_bridge_mdb_entry *br_multicast_new_group(
8ef2a9a5
YH		 588 struct net_bridge *br, struct net_bridge_port *port,
589 struct br_ip *group)
eb1d1641 590{
e8051688 591 struct net_bridge_mdb_htable *mdb;
eb1d1641
HX		 592 struct net_bridge_mdb_entry *mp;
593 int hash;
4c0833bc 594 int err;
eb1d1641 595
e8051688 596 mdb = rcu_dereference_protected(br->mdb, 1);
eb1d1641 597 if (!mdb) {
4c0833bc
TK		 598 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
599 if (err)
600 return ERR_PTR(err);
eb1d1641
HX		 601 goto rehash;
602 }
603
604 hash = br_ip_hash(mdb, group);
605 mp = br_multicast_get_group(br, port, group, hash);
606 switch (PTR_ERR(mp)) {
607 case 0:
608 break;
609
610 case -EAGAIN:
611rehash:
e8051688 612 mdb = rcu_dereference_protected(br->mdb, 1);
eb1d1641
HX		 613 hash = br_ip_hash(mdb, group);
614 break;
615
616 default:
617 goto out;
618 }
619
620 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
621 if (unlikely(!mp))
4c0833bc 622 return ERR_PTR(-ENOMEM);
eb1d1641
HX		 623
624 mp->br = br;
8ef2a9a5 625 mp->addr = *group;
eb1d1641
HX		 626 setup_timer(&mp->timer, br_multicast_group_expired,
627 (unsigned long)mp);
eb1d1641
HX		 628
629 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
630 mdb->size++;
631
632out:
633 return mp;
634}
635
636static int br_multicast_add_group(struct net_bridge *br,
8ef2a9a5
YH		 637 struct net_bridge_port *port,
638 struct br_ip *group)
eb1d1641
HX		 639{
640 struct net_bridge_mdb_entry *mp;
641 struct net_bridge_port_group *p;
e8051688 642 struct net_bridge_port_group __rcu **pp;
eb1d1641
HX		 643 unsigned long now = jiffies;
644 int err;
645
eb1d1641
HX		 646 spin_lock(&br->multicast_lock);
647 if (!netif_running(br->dev) ||
648 (port && port->state == BR_STATE_DISABLED))
649 goto out;
650
651 mp = br_multicast_new_group(br, port, group);
652 err = PTR_ERR(mp);
4c0833bc 653 if (IS_ERR(mp))
eb1d1641
HX		 654 goto err;
655
656 if (!port) {
8a870178 657 mp->mglist = true;
eb1d1641
HX		 658 mod_timer(&mp->timer, now + br->multicast_membership_interval);
659 goto out;
660 }
661
e8051688
ED		 662 for (pp = &mp->ports;
663 (p = mlock_dereference(*pp, br)) != NULL;
664 pp = &p->next) {
eb1d1641
HX		 665 if (p->port == port)
666 goto found;
667 if ((unsigned long)p->port < (unsigned long)port)
668 break;
669 }
670
671 p = kzalloc(sizeof(*p), GFP_ATOMIC);
672 err = -ENOMEM;
673 if (unlikely(!p))
674 goto err;
675
8ef2a9a5 676 p->addr = *group;
eb1d1641
HX		 677 p->port = port;
678 p->next = *pp;
679 hlist_add_head(&p->mglist, &port->mglist);
680 setup_timer(&p->timer, br_multicast_port_group_expired,
681 (unsigned long)p);
eb1d1641
HX		 682
683 rcu_assign_pointer(*pp, p);
684
685found:
686 mod_timer(&p->timer, now + br->multicast_membership_interval);
687out:
688 err = 0;
689
690err:
691 spin_unlock(&br->multicast_lock);
692 return err;
693}
694
8ef2a9a5
YH		 695static int br_ip4_multicast_add_group(struct net_bridge *br,
696 struct net_bridge_port *port,
697 __be32 group)
698{
699 struct br_ip br_group;
700
701 if (ipv4_is_local_multicast(group))
702 return 0;
703
704 br_group.u.ip4 = group;
705 br_group.proto = htons(ETH_P_IP);
706
707 return br_multicast_add_group(br, port, &br_group);
708}
709
dfd56b8b 710#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 711static int br_ip6_multicast_add_group(struct net_bridge *br,
712 struct net_bridge_port *port,
713 const struct in6_addr *group)
714{
715 struct br_ip br_group;
716
e4de9f9e 717 if (!ipv6_is_transient_multicast(group))
08b202b6
YH		 718 return 0;
719
4e3fd7a0 720 br_group.u.ip6 = *group;
9cc6e0c4 721 br_group.proto = htons(ETH_P_IPV6);
08b202b6
YH		 722
723 return br_multicast_add_group(br, port, &br_group);
724}
725#endif
726
eb1d1641
HX		 727static void br_multicast_router_expired(unsigned long data)
728{
729 struct net_bridge_port *port = (void *)data;
730 struct net_bridge *br = port->br;
731
732 spin_lock(&br->multicast_lock);
733 if (port->multicast_router != 1 ||
734 timer_pending(&port->multicast_router_timer) ||
735 hlist_unhashed(&port->rlist))
736 goto out;
737
738 hlist_del_init_rcu(&port->rlist);
739
740out:
741 spin_unlock(&br->multicast_lock);
742}
743
744static void br_multicast_local_router_expired(unsigned long data)
745{
746}
747
c83b8fab
HX		 748static void br_multicast_querier_expired(unsigned long data)
749{
bb63f1f8 750 struct net_bridge *br = (void *)data;
c83b8fab
HX		 751
752 spin_lock(&br->multicast_lock);
753 if (!netif_running(br->dev) || br->multicast_disabled)
754 goto out;
755
756 br_multicast_start_querier(br);
757
758out:
759 spin_unlock(&br->multicast_lock);
760}
761
8ef2a9a5
YH		 762static void __br_multicast_send_query(struct net_bridge *br,
763 struct net_bridge_port *port,
764 struct br_ip *ip)
eb1d1641 765{
eb1d1641
HX		 766 struct sk_buff *skb;
767
8ef2a9a5 768 skb = br_multicast_alloc_query(br, ip);
eb1d1641 769 if (!skb)
8ef2a9a5 770 return;
eb1d1641
HX		 771
772 if (port) {
773 __skb_push(skb, sizeof(struct ethhdr));
774 skb->dev = port->dev;
713aefa3 775 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
eb1d1641
HX		 776 dev_queue_xmit);
777 } else
778 netif_rx(skb);
8ef2a9a5
YH		 779}
780
781static void br_multicast_send_query(struct net_bridge *br,
782 struct net_bridge_port *port, u32 sent)
783{
784 unsigned long time;
785 struct br_ip br_group;
786
787 if (!netif_running(br->dev) || br->multicast_disabled ||
c5c23260 788 !br->multicast_querier ||
8ef2a9a5
YH		 789 timer_pending(&br->multicast_querier_timer))
790 return;
791
08b202b6
YH		 792 memset(&br_group.u, 0, sizeof(br_group.u));
793
8ef2a9a5 794 br_group.proto = htons(ETH_P_IP);
08b202b6 795 __br_multicast_send_query(br, port, &br_group);
8ef2a9a5 796
dfd56b8b 797#if IS_ENABLED(CONFIG_IPV6)
08b202b6 798 br_group.proto = htons(ETH_P_IPV6);
8ef2a9a5 799 __br_multicast_send_query(br, port, &br_group);
08b202b6 800#endif
eb1d1641 801
eb1d1641
HX		 802 time = jiffies;
803 time += sent < br->multicast_startup_query_count ?
804 br->multicast_startup_query_interval :
805 br->multicast_query_interval;
806 mod_timer(port ? &port->multicast_query_timer :
807 &br->multicast_query_timer, time);
808}
809
810static void br_multicast_port_query_expired(unsigned long data)
811{
812 struct net_bridge_port *port = (void *)data;
813 struct net_bridge *br = port->br;
814
815 spin_lock(&br->multicast_lock);
02a780c0
DC		 816 if (port->state == BR_STATE_DISABLED ||
817 port->state == BR_STATE_BLOCKING)
eb1d1641
HX		 818 goto out;
819
820 if (port->multicast_startup_queries_sent <
821 br->multicast_startup_query_count)
822 port->multicast_startup_queries_sent++;
823
824 br_multicast_send_query(port->br, port,
825 port->multicast_startup_queries_sent);
826
827out:
828 spin_unlock(&br->multicast_lock);
829}
830
831void br_multicast_add_port(struct net_bridge_port *port)
832{
833 port->multicast_router = 1;
834
835 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
836 (unsigned long)port);
837 setup_timer(&port->multicast_query_timer,
838 br_multicast_port_query_expired, (unsigned long)port);
839}
840
841void br_multicast_del_port(struct net_bridge_port *port)
842{
843 del_timer_sync(&port->multicast_router_timer);
844}
845
561f1103
HX		 846static void __br_multicast_enable_port(struct net_bridge_port *port)
847{
848 port->multicast_startup_queries_sent = 0;
849
850 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
851 del_timer(&port->multicast_query_timer))
852 mod_timer(&port->multicast_query_timer, jiffies);
853}
854
eb1d1641
HX		 855void br_multicast_enable_port(struct net_bridge_port *port)
856{
857 struct net_bridge *br = port->br;
858
859 spin_lock(&br->multicast_lock);
860 if (br->multicast_disabled || !netif_running(br->dev))
861 goto out;
862
561f1103 863 __br_multicast_enable_port(port);
eb1d1641
HX		 864
865out:
866 spin_unlock(&br->multicast_lock);
867}
868
869void br_multicast_disable_port(struct net_bridge_port *port)
870{
871 struct net_bridge *br = port->br;
872 struct net_bridge_port_group *pg;
873 struct hlist_node *p, *n;
874
875 spin_lock(&br->multicast_lock);
876 hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist)
877 br_multicast_del_pg(br, pg);
878
879 if (!hlist_unhashed(&port->rlist))
880 hlist_del_init_rcu(&port->rlist);
881 del_timer(&port->multicast_router_timer);
882 del_timer(&port->multicast_query_timer);
883 spin_unlock(&br->multicast_lock);
884}
885
8ef2a9a5
YH		 886static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
887 struct net_bridge_port *port,
888 struct sk_buff *skb)
eb1d1641
HX		 889{
890 struct igmpv3_report *ih;
891 struct igmpv3_grec *grec;
892 int i;
893 int len;
894 int num;
895 int type;
896 int err = 0;
897 __be32 group;
898
899 if (!pskb_may_pull(skb, sizeof(*ih)))
900 return -EINVAL;
901
902 ih = igmpv3_report_hdr(skb);
903 num = ntohs(ih->ngrec);
904 len = sizeof(*ih);
905
906 for (i = 0; i < num; i++) {
907 len += sizeof(*grec);
908 if (!pskb_may_pull(skb, len))
909 return -EINVAL;
910
fd218cf9 911 grec = (void *)(skb->data + len - sizeof(*grec));
eb1d1641
HX		 912 group = grec->grec_mca;
913 type = grec->grec_type;
914
8eabf95c 915 len += ntohs(grec->grec_nsrcs) * 4;
eb1d1641
HX		 916 if (!pskb_may_pull(skb, len))
917 return -EINVAL;
918
919 /* We treat this as an IGMPv2 report for now. */
920 switch (type) {
921 case IGMPV3_MODE_IS_INCLUDE:
922 case IGMPV3_MODE_IS_EXCLUDE:
923 case IGMPV3_CHANGE_TO_INCLUDE:
924 case IGMPV3_CHANGE_TO_EXCLUDE:
925 case IGMPV3_ALLOW_NEW_SOURCES:
926 case IGMPV3_BLOCK_OLD_SOURCES:
927 break;
928
929 default:
930 continue;
931 }
932
8ef2a9a5 933 err = br_ip4_multicast_add_group(br, port, group);
eb1d1641
HX		 934 if (err)
935 break;
936 }
937
938 return err;
939}
940
dfd56b8b 941#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 942static int br_ip6_multicast_mld2_report(struct net_bridge *br,
943 struct net_bridge_port *port,
944 struct sk_buff *skb)
945{
946 struct icmp6hdr *icmp6h;
947 struct mld2_grec *grec;
948 int i;
949 int len;
950 int num;
951 int err = 0;
952
953 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
954 return -EINVAL;
955
956 icmp6h = icmp6_hdr(skb);
957 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
958 len = sizeof(*icmp6h);
959
960 for (i = 0; i < num; i++) {
961 __be16 *nsrcs, _nsrcs;
962
963 nsrcs = skb_header_pointer(skb,
964 len + offsetof(struct mld2_grec,
649e984d 965 grec_nsrcs),
08b202b6
YH		 966 sizeof(_nsrcs), &_nsrcs);
967 if (!nsrcs)
968 return -EINVAL;
969
970 if (!pskb_may_pull(skb,
971 len + sizeof(*grec) +
d41db9f3 972 sizeof(struct in6_addr) * ntohs(*nsrcs)))
08b202b6
YH		 973 return -EINVAL;
974
975 grec = (struct mld2_grec *)(skb->data + len);
d41db9f3
LL		 976 len += sizeof(*grec) +
977 sizeof(struct in6_addr) * ntohs(*nsrcs);
08b202b6
YH		 978
979 /* We treat these as MLDv1 reports for now. */
980 switch (grec->grec_type) {
981 case MLD2_MODE_IS_INCLUDE:
982 case MLD2_MODE_IS_EXCLUDE:
983 case MLD2_CHANGE_TO_INCLUDE:
984 case MLD2_CHANGE_TO_EXCLUDE:
985 case MLD2_ALLOW_NEW_SOURCES:
986 case MLD2_BLOCK_OLD_SOURCES:
987 break;
988
989 default:
990 continue;
991 }
992
993 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca);
994 if (!err)
995 break;
996 }
997
998 return err;
999}
1000#endif
1001
7e80c124 1002/*
1003 * Add port to rotuer_list
1004 * list is maintained ordered by pointer value
1005 * and locked by br->multicast_lock and RCU
1006 */
0909e117
HX		 1007static void br_multicast_add_router(struct net_bridge *br,
1008 struct net_bridge_port *port)
1009{
dcdca2c4 1010 struct net_bridge_port *p;
7e80c124 1011 struct hlist_node *n, *slot = NULL;
dcdca2c4 1012
709b9326 1013 hlist_for_each_entry(p, n, &br->router_list, rlist) {
7e80c124 1014 if ((unsigned long) port >= (unsigned long) p)
1015 break;
1016 slot = n;
dcdca2c4 1017 }
1018
7e80c124 1019 if (slot)
1020 hlist_add_after_rcu(slot, &port->rlist);
dcdca2c4 1021 else
1022 hlist_add_head_rcu(&port->rlist, &br->router_list);
0909e117
HX		 1023}
1024
eb1d1641
HX		 1025static void br_multicast_mark_router(struct net_bridge *br,
1026 struct net_bridge_port *port)
1027{
1028 unsigned long now = jiffies;
eb1d1641
HX		 1029
1030 if (!port) {
1031 if (br->multicast_router == 1)
1032 mod_timer(&br->multicast_router_timer,
1033 now + br->multicast_querier_interval);
1034 return;
1035 }
1036
1037 if (port->multicast_router != 1)
1038 return;
1039
1040 if (!hlist_unhashed(&port->rlist))
1041 goto timer;
1042
0909e117 1043 br_multicast_add_router(br, port);
eb1d1641
HX		 1044
1045timer:
1046 mod_timer(&port->multicast_router_timer,
1047 now + br->multicast_querier_interval);
1048}
1049
1050static void br_multicast_query_received(struct net_bridge *br,
1051 struct net_bridge_port *port,
8ef2a9a5 1052 int saddr)
eb1d1641
HX		 1053{
1054 if (saddr)
1055 mod_timer(&br->multicast_querier_timer,
1056 jiffies + br->multicast_querier_interval);
1057 else if (timer_pending(&br->multicast_querier_timer))
1058 return;
1059
1060 br_multicast_mark_router(br, port);
1061}
1062
8ef2a9a5
YH		 1063static int br_ip4_multicast_query(struct net_bridge *br,
1064 struct net_bridge_port *port,
1065 struct sk_buff *skb)
eb1d1641 1066{
b71d1d42 1067 const struct iphdr *iph = ip_hdr(skb);
eb1d1641
HX		 1068 struct igmphdr *ih = igmp_hdr(skb);
1069 struct net_bridge_mdb_entry *mp;
1070 struct igmpv3_query *ih3;
1071 struct net_bridge_port_group *p;
e8051688 1072 struct net_bridge_port_group __rcu **pp;
eb1d1641
HX		 1073 unsigned long max_delay;
1074 unsigned long now = jiffies;
1075 __be32 group;
bec68ff1 1076 int err = 0;
eb1d1641
HX		 1077
1078 spin_lock(&br->multicast_lock);
1079 if (!netif_running(br->dev) ||
1080 (port && port->state == BR_STATE_DISABLED))
1081 goto out;
1082
8ef2a9a5 1083 br_multicast_query_received(br, port, !!iph->saddr);
eb1d1641
HX		 1084
1085 group = ih->group;
1086
1087 if (skb->len == sizeof(*ih)) {
1088 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1089
1090 if (!max_delay) {
1091 max_delay = 10 * HZ;
1092 group = 0;
1093 }
1094 } else {
bec68ff1
YH		 1095 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1096 err = -EINVAL;
1097 goto out;
1098 }
eb1d1641
HX		 1099
1100 ih3 = igmpv3_query_hdr(skb);
1101 if (ih3->nsrcs)
bec68ff1 1102 goto out;
eb1d1641 1103
0ba8c9ec
YH		 1104 max_delay = ih3->code ?
1105 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
eb1d1641
HX		 1106 }
1107
1108 if (!group)
1109 goto out;
1110
e8051688 1111 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group);
eb1d1641
HX		 1112 if (!mp)
1113 goto out;
1114
1115 max_delay *= br->multicast_last_member_count;
1116
8a870178 1117 if (mp->mglist &&
eb1d1641
HX		 1118 (timer_pending(&mp->timer) ?
1119 time_after(mp->timer.expires, now + max_delay) :
1120 try_to_del_timer_sync(&mp->timer) >= 0))
1121 mod_timer(&mp->timer, now + max_delay);
1122
e8051688
ED		 1123 for (pp = &mp->ports;
1124 (p = mlock_dereference(*pp, br)) != NULL;
1125 pp = &p->next) {
eb1d1641
HX		 1126 if (timer_pending(&p->timer) ?
1127 time_after(p->timer.expires, now + max_delay) :
1128 try_to_del_timer_sync(&p->timer) >= 0)
24f9cdcb 1129 mod_timer(&p->timer, now + max_delay);
eb1d1641
HX		 1130 }
1131
1132out:
1133 spin_unlock(&br->multicast_lock);
bec68ff1 1134 return err;
eb1d1641
HX		 1135}
1136
dfd56b8b 1137#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1138static int br_ip6_multicast_query(struct net_bridge *br,
1139 struct net_bridge_port *port,
1140 struct sk_buff *skb)
1141{
b71d1d42 1142 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
08b202b6
YH		 1143 struct mld_msg *mld = (struct mld_msg *) icmp6_hdr(skb);
1144 struct net_bridge_mdb_entry *mp;
1145 struct mld2_query *mld2q;
e8051688
ED		 1146 struct net_bridge_port_group *p;
1147 struct net_bridge_port_group __rcu **pp;
08b202b6
YH		 1148 unsigned long max_delay;
1149 unsigned long now = jiffies;
b71d1d42 1150 const struct in6_addr *group = NULL;
08b202b6
YH		 1151 int err = 0;
1152
1153 spin_lock(&br->multicast_lock);
1154 if (!netif_running(br->dev) ||
1155 (port && port->state == BR_STATE_DISABLED))
1156 goto out;
1157
1158 br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr));
1159
1160 if (skb->len == sizeof(*mld)) {
1161 if (!pskb_may_pull(skb, sizeof(*mld))) {
1162 err = -EINVAL;
1163 goto out;
1164 }
1165 mld = (struct mld_msg *) icmp6_hdr(skb);
4715213d 1166 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
08b202b6
YH		 1167 if (max_delay)
1168 group = &mld->mld_mca;
1169 } else if (skb->len >= sizeof(*mld2q)) {
1170 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1171 err = -EINVAL;
1172 goto out;
1173 }
1174 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1175 if (!mld2q->mld2q_nsrcs)
1176 group = &mld2q->mld2q_mca;
1177 max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(mld2q->mld2q_mrc) : 1;
1178 }
1179
1180 if (!group)
1181 goto out;
1182
e8051688 1183 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group);
08b202b6
YH		 1184 if (!mp)
1185 goto out;
1186
1187 max_delay *= br->multicast_last_member_count;
8a870178 1188 if (mp->mglist &&
08b202b6
YH		 1189 (timer_pending(&mp->timer) ?
1190 time_after(mp->timer.expires, now + max_delay) :
1191 try_to_del_timer_sync(&mp->timer) >= 0))
1192 mod_timer(&mp->timer, now + max_delay);
1193
e8051688
ED		 1194 for (pp = &mp->ports;
1195 (p = mlock_dereference(*pp, br)) != NULL;
1196 pp = &p->next) {
08b202b6
YH		 1197 if (timer_pending(&p->timer) ?
1198 time_after(p->timer.expires, now + max_delay) :
1199 try_to_del_timer_sync(&p->timer) >= 0)
24f9cdcb 1200 mod_timer(&p->timer, now + max_delay);
08b202b6
YH		 1201 }
1202
1203out:
1204 spin_unlock(&br->multicast_lock);
1205 return err;
1206}
1207#endif
1208
eb1d1641
HX		 1209static void br_multicast_leave_group(struct net_bridge *br,
1210 struct net_bridge_port *port,
8ef2a9a5 1211 struct br_ip *group)
eb1d1641
HX		 1212{
1213 struct net_bridge_mdb_htable *mdb;
1214 struct net_bridge_mdb_entry *mp;
1215 struct net_bridge_port_group *p;
1216 unsigned long now;
1217 unsigned long time;
1218
eb1d1641
HX		 1219 spin_lock(&br->multicast_lock);
1220 if (!netif_running(br->dev) ||
1221 (port && port->state == BR_STATE_DISABLED) ||
1222 timer_pending(&br->multicast_querier_timer))
1223 goto out;
1224
e8051688 1225 mdb = mlock_dereference(br->mdb, br);
eb1d1641
HX		 1226 mp = br_mdb_ip_get(mdb, group);
1227 if (!mp)
1228 goto out;
1229
c2d3babf 1230 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
50426b59
AW		 1231 struct net_bridge_port_group __rcu **pp;
1232
1233 for (pp = &mp->ports;
1234 (p = mlock_dereference(*pp, br)) != NULL;
1235 pp = &p->next) {
1236 if (p->port != port)
1237 continue;
1238
1239 rcu_assign_pointer(*pp, p->next);
1240 hlist_del_init(&p->mglist);
1241 del_timer(&p->timer);
1242 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1243
1244 if (!mp->ports && !mp->mglist &&
1245 netif_running(br->dev))
1246 mod_timer(&mp->timer, jiffies);
1247 }
1248 goto out;
1249 }
1250
eb1d1641
HX		 1251 now = jiffies;
1252 time = now + br->multicast_last_member_count *
1253 br->multicast_last_member_interval;
1254
1255 if (!port) {
8a870178 1256 if (mp->mglist &&
eb1d1641
HX		 1257 (timer_pending(&mp->timer) ?
1258 time_after(mp->timer.expires, time) :
1259 try_to_del_timer_sync(&mp->timer) >= 0)) {
1260 mod_timer(&mp->timer, time);
eb1d1641
HX		 1261 }
1262
1263 goto out;
1264 }
1265
e8051688
ED		 1266 for (p = mlock_dereference(mp->ports, br);
1267 p != NULL;
1268 p = mlock_dereference(p->next, br)) {
eb1d1641
HX		 1269 if (p->port != port)
1270 continue;
1271
1272 if (!hlist_unhashed(&p->mglist) &&
1273 (timer_pending(&p->timer) ?
1274 time_after(p->timer.expires, time) :
1275 try_to_del_timer_sync(&p->timer) >= 0)) {
1276 mod_timer(&p->timer, time);
eb1d1641
HX		 1277 }
1278
1279 break;
1280 }
1281
1282out:
1283 spin_unlock(&br->multicast_lock);
1284}
1285
8ef2a9a5
YH		 1286static void br_ip4_multicast_leave_group(struct net_bridge *br,
1287 struct net_bridge_port *port,
1288 __be32 group)
1289{
1290 struct br_ip br_group;
1291
1292 if (ipv4_is_local_multicast(group))
1293 return;
1294
1295 br_group.u.ip4 = group;
1296 br_group.proto = htons(ETH_P_IP);
1297
1298 br_multicast_leave_group(br, port, &br_group);
1299}
1300
dfd56b8b 1301#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1302static void br_ip6_multicast_leave_group(struct net_bridge *br,
1303 struct net_bridge_port *port,
1304 const struct in6_addr *group)
1305{
1306 struct br_ip br_group;
1307
e4de9f9e 1308 if (!ipv6_is_transient_multicast(group))
08b202b6
YH		 1309 return;
1310
4e3fd7a0 1311 br_group.u.ip6 = *group;
08b202b6
YH		 1312 br_group.proto = htons(ETH_P_IPV6);
1313
1314 br_multicast_leave_group(br, port, &br_group);
1315}
1316#endif
8ef2a9a5 1317
eb1d1641
HX		 1318static int br_multicast_ipv4_rcv(struct net_bridge *br,
1319 struct net_bridge_port *port,
1320 struct sk_buff *skb)
1321{
1322 struct sk_buff *skb2 = skb;
b71d1d42 1323 const struct iphdr *iph;
eb1d1641 1324 struct igmphdr *ih;
95c96174
ED		 1325 unsigned int len;
1326 unsigned int offset;
eb1d1641
HX		 1327 int err;
1328
eb1d1641
HX		 1329 /* We treat OOM as packet loss for now. */
1330 if (!pskb_may_pull(skb, sizeof(*iph)))
1331 return -EINVAL;
1332
1333 iph = ip_hdr(skb);
1334
1335 if (iph->ihl < 5 || iph->version != 4)
1336 return -EINVAL;
1337
1338 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1339 return -EINVAL;
1340
1341 iph = ip_hdr(skb);
1342
1343 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1344 return -EINVAL;
1345
bd4265fe
HX		 1346 if (iph->protocol != IPPROTO_IGMP) {
1347 if ((iph->daddr & IGMP_LOCAL_GROUP_MASK) != IGMP_LOCAL_GROUP)
1348 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
eb1d1641 1349 return 0;
bd4265fe 1350 }
eb1d1641
HX		 1351
1352 len = ntohs(iph->tot_len);
1353 if (skb->len < len || len < ip_hdrlen(skb))
1354 return -EINVAL;
1355
1356 if (skb->len > len) {
1357 skb2 = skb_clone(skb, GFP_ATOMIC);
1358 if (!skb2)
1359 return -ENOMEM;
1360
1361 err = pskb_trim_rcsum(skb2, len);
1362 if (err)
8440853b 1363 goto err_out;
eb1d1641
HX		 1364 }
1365
1366 len -= ip_hdrlen(skb2);
1367 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1368 __skb_pull(skb2, offset);
1369 skb_reset_transport_header(skb2);
1370
1371 err = -EINVAL;
1372 if (!pskb_may_pull(skb2, sizeof(*ih)))
1373 goto out;
1374
eb1d1641
HX		 1375 switch (skb2->ip_summed) {
1376 case CHECKSUM_COMPLETE:
1377 if (!csum_fold(skb2->csum))
1378 break;
1379 /* fall through */
1380 case CHECKSUM_NONE:
1381 skb2->csum = 0;
1382 if (skb_checksum_complete(skb2))
8440853b 1383 goto out;
eb1d1641
HX		 1384 }
1385
1386 err = 0;
1387
1388 BR_INPUT_SKB_CB(skb)->igmp = 1;
1389 ih = igmp_hdr(skb2);
1390
1391 switch (ih->type) {
1392 case IGMP_HOST_MEMBERSHIP_REPORT:
1393 case IGMPV2_HOST_MEMBERSHIP_REPORT:
62b2bcb4 1394 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
8ef2a9a5 1395 err = br_ip4_multicast_add_group(br, port, ih->group);
eb1d1641
HX		 1396 break;
1397 case IGMPV3_HOST_MEMBERSHIP_REPORT:
8ef2a9a5 1398 err = br_ip4_multicast_igmp3_report(br, port, skb2);
eb1d1641
HX		 1399 break;
1400 case IGMP_HOST_MEMBERSHIP_QUERY:
8ef2a9a5 1401 err = br_ip4_multicast_query(br, port, skb2);
eb1d1641
HX		 1402 break;
1403 case IGMP_HOST_LEAVE_MESSAGE:
8ef2a9a5 1404 br_ip4_multicast_leave_group(br, port, ih->group);
eb1d1641
HX		 1405 break;
1406 }
1407
1408out:
1409 __skb_push(skb2, offset);
8440853b 1410err_out:
eb1d1641
HX		 1411 if (skb2 != skb)
1412 kfree_skb(skb2);
1413 return err;
1414}
1415
dfd56b8b 1416#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1417static int br_multicast_ipv6_rcv(struct net_bridge *br,
1418 struct net_bridge_port *port,
1419 struct sk_buff *skb)
1420{
9d89081d 1421 struct sk_buff *skb2;
b71d1d42 1422 const struct ipv6hdr *ip6h;
22df1331 1423 u8 icmp6_type;
08b202b6 1424 u8 nexthdr;
75f2811c 1425 __be16 frag_off;
95c96174 1426 unsigned int len;
bb7a0bd6 1427 int offset;
08b202b6
YH		 1428 int err;
1429
08b202b6
YH		 1430 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1431 return -EINVAL;
1432
1433 ip6h = ipv6_hdr(skb);
1434
1435 /*
1436 * We're interested in MLD messages only.
1437 * - Version is 6
1438 * - MLD has always Router Alert hop-by-hop option
1439 * - But we do not support jumbrograms.
1440 */
1441 if (ip6h->version != 6 ||
1442 ip6h->nexthdr != IPPROTO_HOPOPTS ||
1443 ip6h->payload_len == 0)
1444 return 0;
1445
ff9a57a6 1446 len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
08b202b6
YH		 1447 if (skb->len < len)
1448 return -EINVAL;
1449
1450 nexthdr = ip6h->nexthdr;
75f2811c 1451 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
08b202b6
YH		 1452
1453 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1454 return 0;
1455
1456 /* Okay, we found ICMPv6 header */
1457 skb2 = skb_clone(skb, GFP_ATOMIC);
1458 if (!skb2)
1459 return -ENOMEM;
1460
9d89081d
TW		 1461 err = -EINVAL;
1462 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1463 goto out;
1464
08b202b6
YH		 1465 len -= offset - skb_network_offset(skb2);
1466
1467 __skb_pull(skb2, offset);
1468 skb_reset_transport_header(skb2);
fa2da8cd 1469 skb_postpull_rcsum(skb2, skb_network_header(skb2),
1470 skb_network_header_len(skb2));
08b202b6 1471
22df1331 1472 icmp6_type = icmp6_hdr(skb2)->icmp6_type;
08b202b6 1473
22df1331 1474 switch (icmp6_type) {
08b202b6
YH		 1475 case ICMPV6_MGM_QUERY:
1476 case ICMPV6_MGM_REPORT:
1477 case ICMPV6_MGM_REDUCTION:
1478 case ICMPV6_MLD2_REPORT:
1479 break;
1480 default:
1481 err = 0;
1482 goto out;
1483 }
1484
1485 /* Okay, we found MLD message. Check further. */
1486 if (skb2->len > len) {
1487 err = pskb_trim_rcsum(skb2, len);
1488 if (err)
1489 goto out;
4b275d7e 1490 err = -EINVAL;
08b202b6
YH		 1491 }
1492
4b275d7e
YZ		 1493 ip6h = ipv6_hdr(skb2);
1494
08b202b6
YH		 1495 switch (skb2->ip_summed) {
1496 case CHECKSUM_COMPLETE:
4b275d7e
YZ		 1497 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
1498 IPPROTO_ICMPV6, skb2->csum))
08b202b6
YH		 1499 break;
1500 /*FALLTHROUGH*/
1501 case CHECKSUM_NONE:
4b275d7e
YZ		 1502 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
1503 &ip6h->daddr,
1504 skb2->len,
1505 IPPROTO_ICMPV6, 0));
1506 if (__skb_checksum_complete(skb2))
08b202b6
YH		 1507 goto out;
1508 }
1509
1510 err = 0;
1511
1512 BR_INPUT_SKB_CB(skb)->igmp = 1;
1513
22df1331 1514 switch (icmp6_type) {
08b202b6
YH		 1515 case ICMPV6_MGM_REPORT:
1516 {
9d89081d
TW		 1517 struct mld_msg *mld;
1518 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1519 err = -EINVAL;
1520 goto out;
1521 }
1522 mld = (struct mld_msg *)skb_transport_header(skb2);
fc2af6c7 1523 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
08b202b6
YH		 1524 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca);
1525 break;
1526 }
1527 case ICMPV6_MLD2_REPORT:
1528 err = br_ip6_multicast_mld2_report(br, port, skb2);
1529 break;
1530 case ICMPV6_MGM_QUERY:
1531 err = br_ip6_multicast_query(br, port, skb2);
1532 break;
1533 case ICMPV6_MGM_REDUCTION:
1534 {
9d89081d
TW		 1535 struct mld_msg *mld;
1536 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1537 err = -EINVAL;
1538 goto out;
1539 }
1540 mld = (struct mld_msg *)skb_transport_header(skb2);
08b202b6
YH		 1541 br_ip6_multicast_leave_group(br, port, &mld->mld_mca);
1542 }
1543 }
1544
1545out:
9d89081d 1546 kfree_skb(skb2);
08b202b6
YH		 1547 return err;
1548}
1549#endif
1550
eb1d1641
HX		 1551int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1552 struct sk_buff *skb)
1553{
1fafc7a9
YH		 1554 BR_INPUT_SKB_CB(skb)->igmp = 0;
1555 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1556
eb1d1641
HX		 1557 if (br->multicast_disabled)
1558 return 0;
1559
1560 switch (skb->protocol) {
1561 case htons(ETH_P_IP):
1562 return br_multicast_ipv4_rcv(br, port, skb);
dfd56b8b 1563#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1564 case htons(ETH_P_IPV6):
1565 return br_multicast_ipv6_rcv(br, port, skb);
1566#endif
eb1d1641
HX		 1567 }
1568
1569 return 0;
1570}
1571
1572static void br_multicast_query_expired(unsigned long data)
1573{
1574 struct net_bridge *br = (void *)data;
1575
1576 spin_lock(&br->multicast_lock);
1577 if (br->multicast_startup_queries_sent <
1578 br->multicast_startup_query_count)
1579 br->multicast_startup_queries_sent++;
1580
1581 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
1582
1583 spin_unlock(&br->multicast_lock);
1584}
1585
1586void br_multicast_init(struct net_bridge *br)
1587{
1588 br->hash_elasticity = 4;
1589 br->hash_max = 512;
1590
1591 br->multicast_router = 1;
c5c23260 1592 br->multicast_querier = 0;
eb1d1641
HX		 1593 br->multicast_last_member_count = 2;
1594 br->multicast_startup_query_count = 2;
1595
1596 br->multicast_last_member_interval = HZ;
1597 br->multicast_query_response_interval = 10 * HZ;
1598 br->multicast_startup_query_interval = 125 * HZ / 4;
1599 br->multicast_query_interval = 125 * HZ;
1600 br->multicast_querier_interval = 255 * HZ;
1601 br->multicast_membership_interval = 260 * HZ;
1602
1603 spin_lock_init(&br->multicast_lock);
1604 setup_timer(&br->multicast_router_timer,
1605 br_multicast_local_router_expired, 0);
1606 setup_timer(&br->multicast_querier_timer,
bb63f1f8 1607 br_multicast_querier_expired, (unsigned long)br);
eb1d1641
HX		 1608 setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
1609 (unsigned long)br);
ee07c6e7 1610 br_mdb_init();
eb1d1641
HX		 1611}
1612
1613void br_multicast_open(struct net_bridge *br)
1614{
1615 br->multicast_startup_queries_sent = 0;
1616
1617 if (br->multicast_disabled)
1618 return;
1619
1620 mod_timer(&br->multicast_query_timer, jiffies);
1621}
1622
1623void br_multicast_stop(struct net_bridge *br)
1624{
1625 struct net_bridge_mdb_htable *mdb;
1626 struct net_bridge_mdb_entry *mp;
1627 struct hlist_node *p, *n;
1628 u32 ver;
1629 int i;
1630
1631 del_timer_sync(&br->multicast_router_timer);
1632 del_timer_sync(&br->multicast_querier_timer);
1633 del_timer_sync(&br->multicast_query_timer);
1634
1635 spin_lock_bh(&br->multicast_lock);
e8051688 1636 mdb = mlock_dereference(br->mdb, br);
eb1d1641
HX		 1637 if (!mdb)
1638 goto out;
1639
1640 br->mdb = NULL;
1641
1642 ver = mdb->ver;
1643 for (i = 0; i < mdb->max; i++) {
1644 hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i],
1645 hlist[ver]) {
1646 del_timer(&mp->timer);
eb1d1641
HX		 1647 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1648 }
1649 }
1650
1651 if (mdb->old) {
1652 spin_unlock_bh(&br->multicast_lock);
10cc2b50 1653 rcu_barrier_bh();
eb1d1641
HX		 1654 spin_lock_bh(&br->multicast_lock);
1655 WARN_ON(mdb->old);
1656 }
1657
1658 mdb->old = mdb;
1659 call_rcu_bh(&mdb->rcu, br_mdb_free);
1660
1661out:
1662 spin_unlock_bh(&br->multicast_lock);
1663}
0909e117
HX		 1664
1665int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1666{
1667 int err = -ENOENT;
1668
1669 spin_lock_bh(&br->multicast_lock);
1670 if (!netif_running(br->dev))
1671 goto unlock;
1672
1673 switch (val) {
1674 case 0:
1675 case 2:
1676 del_timer(&br->multicast_router_timer);
1677 /* fall through */
1678 case 1:
1679 br->multicast_router = val;
1680 err = 0;
1681 break;
1682
1683 default:
1684 err = -EINVAL;
1685 break;
1686 }
1687
1688unlock:
1689 spin_unlock_bh(&br->multicast_lock);
1690
1691 return err;
1692}
1693
1694int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1695{
1696 struct net_bridge *br = p->br;
1697 int err = -ENOENT;
1698
1699 spin_lock(&br->multicast_lock);
1700 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1701 goto unlock;
1702
1703 switch (val) {
1704 case 0:
1705 case 1:
1706 case 2:
1707 p->multicast_router = val;
1708 err = 0;
1709
1710 if (val < 2 && !hlist_unhashed(&p->rlist))
1711 hlist_del_init_rcu(&p->rlist);
1712
1713 if (val == 1)
1714 break;
1715
1716 del_timer(&p->multicast_router_timer);
1717
1718 if (val == 0)
1719 break;
1720
1721 br_multicast_add_router(br, p);
1722 break;
1723
1724 default:
1725 err = -EINVAL;
1726 break;
1727 }
1728
1729unlock:
1730 spin_unlock(&br->multicast_lock);
1731
1732 return err;
1733}
561f1103 1734
74857216 1735static void br_multicast_start_querier(struct net_bridge *br)
561f1103
HX		 1736{
1737 struct net_bridge_port *port;
74857216
HX		 1738
1739 br_multicast_open(br);
1740
1741 list_for_each_entry(port, &br->port_list, list) {
1742 if (port->state == BR_STATE_DISABLED ||
1743 port->state == BR_STATE_BLOCKING)
1744 continue;
1745
1746 __br_multicast_enable_port(port);
1747 }
1748}
1749
1750int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1751{
3a7fda06 1752 int err = 0;
e8051688 1753 struct net_bridge_mdb_htable *mdb;
561f1103 1754
ef5e0d82 1755 spin_lock_bh(&br->multicast_lock);
561f1103
HX		 1756 if (br->multicast_disabled == !val)
1757 goto unlock;
1758
1759 br->multicast_disabled = !val;
1760 if (br->multicast_disabled)
1761 goto unlock;
1762
3a7fda06
HX		 1763 if (!netif_running(br->dev))
1764 goto unlock;
1765
e8051688
ED		 1766 mdb = mlock_dereference(br->mdb, br);
1767 if (mdb) {
1768 if (mdb->old) {
561f1103
HX		 1769 err = -EEXIST;
1770rollback:
1771 br->multicast_disabled = !!val;
1772 goto unlock;
1773 }
1774
e8051688 1775 err = br_mdb_rehash(&br->mdb, mdb->max,
561f1103
HX		 1776 br->hash_elasticity);
1777 if (err)
1778 goto rollback;
1779 }
1780
74857216 1781 br_multicast_start_querier(br);
561f1103
HX		 1782
1783unlock:
ef5e0d82 1784 spin_unlock_bh(&br->multicast_lock);
561f1103
HX		 1785
1786 return err;
1787}
b195167f 1788
c5c23260
HX		 1789int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1790{
1791 val = !!val;
1792
1793 spin_lock_bh(&br->multicast_lock);
1794 if (br->multicast_querier == val)
1795 goto unlock;
1796
1797 br->multicast_querier = val;
1798 if (val)
1799 br_multicast_start_querier(br);
1800
1801unlock:
1802 spin_unlock_bh(&br->multicast_lock);
1803
1804 return 0;
1805}
1806
b195167f
HX		 1807int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1808{
1809 int err = -ENOENT;
1810 u32 old;
e8051688 1811 struct net_bridge_mdb_htable *mdb;
b195167f
HX		 1812
1813 spin_lock(&br->multicast_lock);
1814 if (!netif_running(br->dev))
1815 goto unlock;
1816
1817 err = -EINVAL;
1818 if (!is_power_of_2(val))
1819 goto unlock;
e8051688
ED		 1820
1821 mdb = mlock_dereference(br->mdb, br);
1822 if (mdb && val < mdb->size)
b195167f
HX		 1823 goto unlock;
1824
1825 err = 0;
1826
1827 old = br->hash_max;
1828 br->hash_max = val;
1829
e8051688
ED		 1830 if (mdb) {
1831 if (mdb->old) {
b195167f
HX		 1832 err = -EEXIST;
1833rollback:
1834 br->hash_max = old;
1835 goto unlock;
1836 }
1837
1838 err = br_mdb_rehash(&br->mdb, br->hash_max,
1839 br->hash_elasticity);
1840 if (err)
1841 goto rollback;
1842 }
1843
1844unlock:
1845 spin_unlock(&br->multicast_lock);
1846
1847 return err;
1848}
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