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netfilter: bridge: prevent UAF in brnf_exit_net()
[mirror_ubuntu-bionic-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>
07f8ac4a 14#include <linux/export.h>
eb1d1641
HX		 15#include <linux/if_ether.h>
16#include <linux/igmp.h>
17#include <linux/jhash.h>
18#include <linux/kernel.h>
b195167f 19#include <linux/log2.h>
eb1d1641
HX		 20#include <linux/netdevice.h>
21#include <linux/netfilter_bridge.h>
22#include <linux/random.h>
23#include <linux/rculist.h>
24#include <linux/skbuff.h>
25#include <linux/slab.h>
26#include <linux/timer.h>
1c8ad5bf 27#include <linux/inetdevice.h>
91b02d3d 28#include <linux/mroute.h>
eb1d1641 29#include <net/ip.h>
147c1e9b 30#include <net/switchdev.h>
dfd56b8b 31#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 32#include <net/ipv6.h>
33#include <net/mld.h>
d4c4f07d 34#include <net/ip6_checksum.h>
3c3769e6 35#include <net/addrconf.h>
08b202b6 36#endif
eb1d1641
HX		 37
38#include "br_private.h"
39
cc0fdd80 40static void br_multicast_start_querier(struct net_bridge *br,
90010b36 41 struct bridge_mcast_own_query *query);
754bc547
SA		 42static void br_multicast_add_router(struct net_bridge *br,
43 struct net_bridge_port *port);
bc8c20ac
SA		 44static void br_ip4_multicast_leave_group(struct net_bridge *br,
45 struct net_bridge_port *port,
46 __be32 group,
6db6f0ea
FF		 47 __u16 vid,
48 const unsigned char *src);
49
f12e7d95 50static void __del_port_router(struct net_bridge_port *p);
bc8c20ac
SA		 51#if IS_ENABLED(CONFIG_IPV6)
52static void br_ip6_multicast_leave_group(struct net_bridge *br,
53 struct net_bridge_port *port,
54 const struct in6_addr *group,
6db6f0ea 55 __u16 vid, const unsigned char *src);
bc8c20ac 56#endif
2ce297fc 57unsigned int br_mdb_rehash_seq;
c83b8fab 58
8ef2a9a5
YH		 59static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
60{
61 if (a->proto != b->proto)
62 return 0;
b0e9a30d
VY		 63 if (a->vid != b->vid)
64 return 0;
8ef2a9a5
YH		 65 switch (a->proto) {
66 case htons(ETH_P_IP):
67 return a->u.ip4 == b->u.ip4;
dfd56b8b 68#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 69 case htons(ETH_P_IPV6):
70 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
71#endif
8ef2a9a5
YH		 72 }
73 return 0;
74}
75
b0e9a30d
VY		 76static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
77 __u16 vid)
eb1d1641 78{
b0e9a30d 79 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
eb1d1641
HX		 80}
81
dfd56b8b 82#if IS_ENABLED(CONFIG_IPV6)
08b202b6 83static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
b0e9a30d
VY		 84 const struct in6_addr *ip,
85 __u16 vid)
08b202b6 86{
b0e9a30d
VY		 87 return jhash_2words(ipv6_addr_hash(ip), vid,
88 mdb->secret) & (mdb->max - 1);
08b202b6
YH		 89}
90#endif
91
8ef2a9a5
YH		 92static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
93 struct br_ip *ip)
94{
95 switch (ip->proto) {
96 case htons(ETH_P_IP):
b0e9a30d 97 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
dfd56b8b 98#if IS_ENABLED(CONFIG_IPV6)
08b202b6 99 case htons(ETH_P_IPV6):
b0e9a30d 100 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
08b202b6 101#endif
8ef2a9a5
YH		 102 }
103 return 0;
eb1d1641
HX		 104}
105
106static struct net_bridge_mdb_entry *__br_mdb_ip_get(
8ef2a9a5 107 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
eb1d1641
HX		 108{
109 struct net_bridge_mdb_entry *mp;
eb1d1641 110
b67bfe0d 111 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
8ef2a9a5 112 if (br_ip_equal(&mp->addr, dst))
eb1d1641
HX		 113 return mp;
114 }
115
116 return NULL;
117}
118
cfd56754
CW		 119struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
120 struct br_ip *dst)
7f285fa7
HX		 121{
122 if (!mdb)
123 return NULL;
124
125 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
126}
127
8ef2a9a5 128static struct net_bridge_mdb_entry *br_mdb_ip4_get(
b0e9a30d 129 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
eb1d1641 130{
8ef2a9a5
YH		 131 struct br_ip br_dst;
132
133 br_dst.u.ip4 = dst;
134 br_dst.proto = htons(ETH_P_IP);
b0e9a30d 135 br_dst.vid = vid;
0821ec55 136
7f285fa7 137 return br_mdb_ip_get(mdb, &br_dst);
8ef2a9a5
YH		 138}
139
dfd56b8b 140#if IS_ENABLED(CONFIG_IPV6)
08b202b6 141static struct net_bridge_mdb_entry *br_mdb_ip6_get(
b0e9a30d
VY		 142 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
143 __u16 vid)
08b202b6
YH		 144{
145 struct br_ip br_dst;
0821ec55 146
4e3fd7a0 147 br_dst.u.ip6 = *dst;
08b202b6 148 br_dst.proto = htons(ETH_P_IPV6);
b0e9a30d 149 br_dst.vid = vid;
08b202b6 150
7f285fa7 151 return br_mdb_ip_get(mdb, &br_dst);
08b202b6
YH		 152}
153#endif
154
eb1d1641 155struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
fbca58a2 156 struct sk_buff *skb, u16 vid)
eb1d1641 157{
e8051688 158 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
8ef2a9a5
YH		 159 struct br_ip ip;
160
7f285fa7 161 if (br->multicast_disabled)
eb1d1641
HX		 162 return NULL;
163
8ef2a9a5 164 if (BR_INPUT_SKB_CB(skb)->igmp)
eb1d1641
HX		 165 return NULL;
166
8ef2a9a5 167 ip.proto = skb->protocol;
fbca58a2 168 ip.vid = vid;
8ef2a9a5 169
eb1d1641
HX		 170 switch (skb->protocol) {
171 case htons(ETH_P_IP):
8ef2a9a5
YH		 172 ip.u.ip4 = ip_hdr(skb)->daddr;
173 break;
dfd56b8b 174#if IS_ENABLED(CONFIG_IPV6)
08b202b6 175 case htons(ETH_P_IPV6):
4e3fd7a0 176 ip.u.ip6 = ipv6_hdr(skb)->daddr;
08b202b6
YH		 177 break;
178#endif
8ef2a9a5
YH		 179 default:
180 return NULL;
eb1d1641
HX		 181 }
182
8ef2a9a5 183 return br_mdb_ip_get(mdb, &ip);
eb1d1641
HX		 184}
185
186static void br_mdb_free(struct rcu_head *head)
187{
188 struct net_bridge_mdb_htable *mdb =
189 container_of(head, struct net_bridge_mdb_htable, rcu);
190 struct net_bridge_mdb_htable *old = mdb->old;
191
192 mdb->old = NULL;
193 kfree(old->mhash);
194 kfree(old);
195}
196
197static int br_mdb_copy(struct net_bridge_mdb_htable *new,
198 struct net_bridge_mdb_htable *old,
199 int elasticity)
200{
201 struct net_bridge_mdb_entry *mp;
eb1d1641
HX		 202 int maxlen;
203 int len;
204 int i;
205
206 for (i = 0; i < old->max; i++)
b67bfe0d 207 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
eb1d1641 208 hlist_add_head(&mp->hlist[new->ver],
8ef2a9a5 209 &new->mhash[br_ip_hash(new, &mp->addr)]);
eb1d1641
HX		 210
211 if (!elasticity)
212 return 0;
213
214 maxlen = 0;
215 for (i = 0; i < new->max; i++) {
216 len = 0;
b67bfe0d 217 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
eb1d1641
HX		 218 len++;
219 if (len > maxlen)
220 maxlen = len;
221 }
222
223 return maxlen > elasticity ? -EINVAL : 0;
224}
225
cfd56754 226void br_multicast_free_pg(struct rcu_head *head)
eb1d1641
HX		 227{
228 struct net_bridge_port_group *p =
229 container_of(head, struct net_bridge_port_group, rcu);
230
231 kfree(p);
232}
233
234static void br_multicast_free_group(struct rcu_head *head)
235{
236 struct net_bridge_mdb_entry *mp =
237 container_of(head, struct net_bridge_mdb_entry, rcu);
238
239 kfree(mp);
240}
241
88c1f37f 242static void br_multicast_group_expired(struct timer_list *t)
eb1d1641 243{
88c1f37f 244 struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer);
eb1d1641
HX		 245 struct net_bridge *br = mp->br;
246 struct net_bridge_mdb_htable *mdb;
247
248 spin_lock(&br->multicast_lock);
249 if (!netif_running(br->dev) || timer_pending(&mp->timer))
250 goto out;
251
ff0fd34e 252 mp->host_joined = false;
2a26028d 253 br_mdb_notify(br->dev, NULL, &mp->addr, RTM_DELMDB, 0);
eb1d1641
HX		 254
255 if (mp->ports)
256 goto out;
257
e8051688
ED		 258 mdb = mlock_dereference(br->mdb, br);
259
eb1d1641
HX		 260 hlist_del_rcu(&mp->hlist[mdb->ver]);
261 mdb->size--;
262
eb1d1641
HX		 263 call_rcu_bh(&mp->rcu, br_multicast_free_group);
264
265out:
266 spin_unlock(&br->multicast_lock);
267}
268
269static void br_multicast_del_pg(struct net_bridge *br,
270 struct net_bridge_port_group *pg)
271{
e8051688 272 struct net_bridge_mdb_htable *mdb;
eb1d1641
HX		 273 struct net_bridge_mdb_entry *mp;
274 struct net_bridge_port_group *p;
e8051688
ED		 275 struct net_bridge_port_group __rcu **pp;
276
277 mdb = mlock_dereference(br->mdb, br);
eb1d1641 278
8ef2a9a5 279 mp = br_mdb_ip_get(mdb, &pg->addr);
eb1d1641
HX		 280 if (WARN_ON(!mp))
281 return;
282
e8051688
ED		 283 for (pp = &mp->ports;
284 (p = mlock_dereference(*pp, br)) != NULL;
285 pp = &p->next) {
eb1d1641
HX		 286 if (p != pg)
287 continue;
288
83f6a740 289 rcu_assign_pointer(*pp, p->next);
eb1d1641
HX		 290 hlist_del_init(&p->mglist);
291 del_timer(&p->timer);
45ebcce5
ER		 292 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
293 p->flags);
eb1d1641
HX		 294 call_rcu_bh(&p->rcu, br_multicast_free_pg);
295
ff0fd34e 296 if (!mp->ports && !mp->host_joined &&
eb1d1641
HX		 297 netif_running(br->dev))
298 mod_timer(&mp->timer, jiffies);
299
300 return;
301 }
302
303 WARN_ON(1);
304}
305
88c1f37f 306static void br_multicast_port_group_expired(struct timer_list *t)
eb1d1641 307{
88c1f37f 308 struct net_bridge_port_group *pg = from_timer(pg, t, timer);
eb1d1641
HX		 309 struct net_bridge *br = pg->port->br;
310
311 spin_lock(&br->multicast_lock);
312 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
9d06b6d8 313 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
eb1d1641
HX		 314 goto out;
315
316 br_multicast_del_pg(br, pg);
317
318out:
319 spin_unlock(&br->multicast_lock);
320}
321
e8051688 322static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
eb1d1641
HX		 323 int elasticity)
324{
e8051688 325 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
eb1d1641
HX		 326 struct net_bridge_mdb_htable *mdb;
327 int err;
328
329 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
330 if (!mdb)
331 return -ENOMEM;
332
333 mdb->max = max;
334 mdb->old = old;
335
336 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
337 if (!mdb->mhash) {
338 kfree(mdb);
339 return -ENOMEM;
340 }
341
342 mdb->size = old ? old->size : 0;
343 mdb->ver = old ? old->ver ^ 1 : 0;
344
345 if (!old || elasticity)
346 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
347 else
348 mdb->secret = old->secret;
349
350 if (!old)
351 goto out;
352
353 err = br_mdb_copy(mdb, old, elasticity);
354 if (err) {
355 kfree(mdb->mhash);
356 kfree(mdb);
357 return err;
358 }
359
2ce297fc 360 br_mdb_rehash_seq++;
eb1d1641
HX		 361 call_rcu_bh(&mdb->rcu, br_mdb_free);
362
363out:
364 rcu_assign_pointer(*mdbp, mdb);
365
366 return 0;
367}
368
8ef2a9a5 369static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
1080ab95
NA		 370 __be32 group,
371 u8 *igmp_type)
eb1d1641 372{
5e923585
NA		 373 struct igmpv3_query *ihv3;
374 size_t igmp_hdr_size;
eb1d1641
HX		 375 struct sk_buff *skb;
376 struct igmphdr *ih;
377 struct ethhdr *eth;
378 struct iphdr *iph;
379
5e923585
NA		 380 igmp_hdr_size = sizeof(*ih);
381 if (br->multicast_igmp_version == 3)
382 igmp_hdr_size = sizeof(*ihv3);
eb1d1641 383 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
5e923585 384 igmp_hdr_size + 4);
eb1d1641
HX		 385 if (!skb)
386 goto out;
387
388 skb->protocol = htons(ETH_P_IP);
389
390 skb_reset_mac_header(skb);
391 eth = eth_hdr(skb);
392
e5a727f6 393 ether_addr_copy(eth->h_source, br->dev->dev_addr);
eb1d1641
HX		 394 eth->h_dest[0] = 1;
395 eth->h_dest[1] = 0;
396 eth->h_dest[2] = 0x5e;
397 eth->h_dest[3] = 0;
398 eth->h_dest[4] = 0;
399 eth->h_dest[5] = 1;
400 eth->h_proto = htons(ETH_P_IP);
401 skb_put(skb, sizeof(*eth));
402
403 skb_set_network_header(skb, skb->len);
404 iph = ip_hdr(skb);
405
406 iph->version = 4;
407 iph->ihl = 6;
408 iph->tos = 0xc0;
5e923585 409 iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4);
eb1d1641
HX		 410 iph->id = 0;
411 iph->frag_off = htons(IP_DF);
412 iph->ttl = 1;
413 iph->protocol = IPPROTO_IGMP;
1c8ad5bf
CW		 414 iph->saddr = br->multicast_query_use_ifaddr ?
415 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
eb1d1641
HX		 416 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
417 ((u8 *)&iph[1])[0] = IPOPT_RA;
418 ((u8 *)&iph[1])[1] = 4;
419 ((u8 *)&iph[1])[2] = 0;
420 ((u8 *)&iph[1])[3] = 0;
421 ip_send_check(iph);
422 skb_put(skb, 24);
423
424 skb_set_transport_header(skb, skb->len);
1080ab95 425 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
eb1d1641 426
5e923585
NA		 427 switch (br->multicast_igmp_version) {
428 case 2:
429 ih = igmp_hdr(skb);
430 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
431 ih->code = (group ? br->multicast_last_member_interval :
432 br->multicast_query_response_interval) /
433 (HZ / IGMP_TIMER_SCALE);
434 ih->group = group;
435 ih->csum = 0;
436 ih->csum = ip_compute_csum((void *)ih, sizeof(*ih));
437 break;
438 case 3:
439 ihv3 = igmpv3_query_hdr(skb);
440 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
441 ihv3->code = (group ? br->multicast_last_member_interval :
442 br->multicast_query_response_interval) /
443 (HZ / IGMP_TIMER_SCALE);
444 ihv3->group = group;
445 ihv3->qqic = br->multicast_query_interval / HZ;
446 ihv3->nsrcs = 0;
447 ihv3->resv = 0;
448 ihv3->suppress = 0;
449 ihv3->qrv = 2;
450 ihv3->csum = 0;
451 ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3));
452 break;
453 }
454
455 skb_put(skb, igmp_hdr_size);
eb1d1641
HX		 456 __skb_pull(skb, sizeof(*eth));
457
458out:
459 return skb;
460}
461
dfd56b8b 462#if IS_ENABLED(CONFIG_IPV6)
08b202b6 463static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
1080ab95
NA		 464 const struct in6_addr *grp,
465 u8 *igmp_type)
08b202b6 466{
aa2ae3e7
NA		 467 struct mld2_query *mld2q;
468 unsigned long interval;
08b202b6
YH		 469 struct ipv6hdr *ip6h;
470 struct mld_msg *mldq;
aa2ae3e7
NA		 471 size_t mld_hdr_size;
472 struct sk_buff *skb;
08b202b6
YH		 473 struct ethhdr *eth;
474 u8 *hopopt;
08b202b6 475
aa2ae3e7
NA		 476 mld_hdr_size = sizeof(*mldq);
477 if (br->multicast_mld_version == 2)
478 mld_hdr_size = sizeof(*mld2q);
08b202b6 479 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
aa2ae3e7 480 8 + mld_hdr_size);
08b202b6
YH		 481 if (!skb)
482 goto out;
483
484 skb->protocol = htons(ETH_P_IPV6);
485
486 /* Ethernet header */
487 skb_reset_mac_header(skb);
488 eth = eth_hdr(skb);
489
e5a727f6 490 ether_addr_copy(eth->h_source, br->dev->dev_addr);
08b202b6
YH		 491 eth->h_proto = htons(ETH_P_IPV6);
492 skb_put(skb, sizeof(*eth));
493
494 /* IPv6 header + HbH option */
495 skb_set_network_header(skb, skb->len);
496 ip6h = ipv6_hdr(skb);
497
498 *(__force __be32 *)ip6h = htonl(0x60000000);
aa2ae3e7 499 ip6h->payload_len = htons(8 + mld_hdr_size);
08b202b6
YH		 500 ip6h->nexthdr = IPPROTO_HOPOPTS;
501 ip6h->hop_limit = 1;
a7bff75b 502 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
d1d81d4c
UW		 503 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
504 &ip6h->saddr)) {
505 kfree_skb(skb);
0888d5f3 506 br->has_ipv6_addr = 0;
d1d81d4c
UW		 507 return NULL;
508 }
0888d5f3 509
510 br->has_ipv6_addr = 1;
36cff5a1 511 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
08b202b6
YH		 512
513 hopopt = (u8 *)(ip6h + 1);
514 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
515 hopopt[1] = 0; /* length of HbH */
516 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
517 hopopt[3] = 2; /* Length of RA Option */
518 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
519 hopopt[5] = 0;
1de5a71c
EZ		 520 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
521 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
08b202b6
YH		 522
523 skb_put(skb, sizeof(*ip6h) + 8);
524
525 /* ICMPv6 */
526 skb_set_transport_header(skb, skb->len);
1080ab95 527 interval = ipv6_addr_any(grp) ?
32de868c
LL		 528 br->multicast_query_response_interval :
529 br->multicast_last_member_interval;
1080ab95 530 *igmp_type = ICMPV6_MGM_QUERY;
aa2ae3e7
NA		 531 switch (br->multicast_mld_version) {
532 case 1:
533 mldq = (struct mld_msg *)icmp6_hdr(skb);
534 mldq->mld_type = ICMPV6_MGM_QUERY;
535 mldq->mld_code = 0;
536 mldq->mld_cksum = 0;
537 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
538 mldq->mld_reserved = 0;
539 mldq->mld_mca = *grp;
540 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
541 sizeof(*mldq), IPPROTO_ICMPV6,
542 csum_partial(mldq,
543 sizeof(*mldq),
544 0));
545 break;
546 case 2:
547 mld2q = (struct mld2_query *)icmp6_hdr(skb);
53631a5f 548 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
aa2ae3e7
NA		 549 mld2q->mld2q_type = ICMPV6_MGM_QUERY;
550 mld2q->mld2q_code = 0;
551 mld2q->mld2q_cksum = 0;
552 mld2q->mld2q_resv1 = 0;
553 mld2q->mld2q_resv2 = 0;
554 mld2q->mld2q_suppress = 0;
555 mld2q->mld2q_qrv = 2;
556 mld2q->mld2q_nsrcs = 0;
557 mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
558 mld2q->mld2q_mca = *grp;
559 mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
560 sizeof(*mld2q),
561 IPPROTO_ICMPV6,
562 csum_partial(mld2q,
563 sizeof(*mld2q),
564 0));
565 break;
566 }
567 skb_put(skb, mld_hdr_size);
08b202b6
YH		 568
569 __skb_pull(skb, sizeof(*eth));
570
571out:
572 return skb;
573}
574#endif
575
8ef2a9a5 576static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
1080ab95
NA		 577 struct br_ip *addr,
578 u8 *igmp_type)
8ef2a9a5
YH		 579{
580 switch (addr->proto) {
581 case htons(ETH_P_IP):
1080ab95 582 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
dfd56b8b 583#if IS_ENABLED(CONFIG_IPV6)
08b202b6 584 case htons(ETH_P_IPV6):
1080ab95
NA		 585 return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
586 igmp_type);
08b202b6 587#endif
8ef2a9a5
YH		 588 }
589 return NULL;
590}
591
eb1d1641 592static struct net_bridge_mdb_entry *br_multicast_get_group(
8ef2a9a5
YH		 593 struct net_bridge *br, struct net_bridge_port *port,
594 struct br_ip *group, int hash)
eb1d1641 595{
e8051688 596 struct net_bridge_mdb_htable *mdb;
eb1d1641 597 struct net_bridge_mdb_entry *mp;
95c96174
ED		 598 unsigned int count = 0;
599 unsigned int max;
eb1d1641
HX		 600 int elasticity;
601 int err;
602
e8051688 603 mdb = rcu_dereference_protected(br->mdb, 1);
b67bfe0d 604 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
eb1d1641 605 count++;
8ef2a9a5 606 if (unlikely(br_ip_equal(group, &mp->addr)))
eb1d1641 607 return mp;
eb1d1641
HX		 608 }
609
610 elasticity = 0;
611 max = mdb->max;
612
613 if (unlikely(count > br->hash_elasticity && count)) {
614 if (net_ratelimit())
28a16c97 615 br_info(br, "Multicast hash table "
616 "chain limit reached: %s\n",
617 port ? port->dev->name : br->dev->name);
eb1d1641
HX		 618
619 elasticity = br->hash_elasticity;
620 }
621
622 if (mdb->size >= max) {
623 max *= 2;
036be6db
TG		 624 if (unlikely(max > br->hash_max)) {
625 br_warn(br, "Multicast hash table maximum of %d "
626 "reached, disabling snooping: %s\n",
627 br->hash_max,
628 port ? port->dev->name : br->dev->name);
eb1d1641
HX		 629 err = -E2BIG;
630disable:
631 br->multicast_disabled = 1;
632 goto err;
633 }
634 }
635
636 if (max > mdb->max || elasticity) {
637 if (mdb->old) {
638 if (net_ratelimit())
28a16c97 639 br_info(br, "Multicast hash table "
640 "on fire: %s\n",
641 port ? port->dev->name : br->dev->name);
eb1d1641
HX		 642 err = -EEXIST;
643 goto err;
644 }
645
646 err = br_mdb_rehash(&br->mdb, max, elasticity);
647 if (err) {
28a16c97 648 br_warn(br, "Cannot rehash multicast "
649 "hash table, disabling snooping: %s, %d, %d\n",
650 port ? port->dev->name : br->dev->name,
651 mdb->size, err);
eb1d1641
HX		 652 goto disable;
653 }
654
655 err = -EAGAIN;
656 goto err;
657 }
658
659 return NULL;
660
661err:
662 mp = ERR_PTR(err);
663 return mp;
664}
665
cfd56754 666struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
5e923585
NA		 667 struct net_bridge_port *p,
668 struct br_ip *group)
eb1d1641 669{
e8051688 670 struct net_bridge_mdb_htable *mdb;
eb1d1641
HX		 671 struct net_bridge_mdb_entry *mp;
672 int hash;
4c0833bc 673 int err;
eb1d1641 674
e8051688 675 mdb = rcu_dereference_protected(br->mdb, 1);
eb1d1641 676 if (!mdb) {
4c0833bc
TK		 677 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
678 if (err)
679 return ERR_PTR(err);
eb1d1641
HX		 680 goto rehash;
681 }
682
683 hash = br_ip_hash(mdb, group);
5e923585 684 mp = br_multicast_get_group(br, p, group, hash);
eb1d1641
HX		 685 switch (PTR_ERR(mp)) {
686 case 0:
687 break;
688
689 case -EAGAIN:
690rehash:
e8051688 691 mdb = rcu_dereference_protected(br->mdb, 1);
eb1d1641
HX		 692 hash = br_ip_hash(mdb, group);
693 break;
694
695 default:
696 goto out;
697 }
698
699 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
700 if (unlikely(!mp))
4c0833bc 701 return ERR_PTR(-ENOMEM);
eb1d1641
HX		 702
703 mp->br = br;
8ef2a9a5 704 mp->addr = *group;
88c1f37f 705 timer_setup(&mp->timer, br_multicast_group_expired, 0);
1faabf2a 706
eb1d1641
HX		 707 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
708 mdb->size++;
709
710out:
711 return mp;
712}
713
cfd56754
CW		 714struct net_bridge_port_group *br_multicast_new_port_group(
715 struct net_bridge_port *port,
716 struct br_ip *group,
ccb1c31a 717 struct net_bridge_port_group __rcu *next,
6db6f0ea
FF		 718 unsigned char flags,
719 const unsigned char *src)
cfd56754
CW		 720{
721 struct net_bridge_port_group *p;
722
723 p = kzalloc(sizeof(*p), GFP_ATOMIC);
724 if (unlikely(!p))
725 return NULL;
726
727 p->addr = *group;
728 p->port = port;
9d06b6d8 729 p->flags = flags;
eca2a43b 730 rcu_assign_pointer(p->next, next);
cfd56754 731 hlist_add_head(&p->mglist, &port->mglist);
88c1f37f 732 timer_setup(&p->timer, br_multicast_port_group_expired, 0);
6db6f0ea
FF		 733
734 if (src)
735 memcpy(p->eth_addr, src, ETH_ALEN);
736 else
737 memset(p->eth_addr, 0xff, ETH_ALEN);
738
cfd56754
CW		 739 return p;
740}
741
6db6f0ea
FF		 742static bool br_port_group_equal(struct net_bridge_port_group *p,
743 struct net_bridge_port *port,
744 const unsigned char *src)
745{
746 if (p->port != port)
747 return false;
748
749 if (!(port->flags & BR_MULTICAST_TO_UNICAST))
750 return true;
751
752 return ether_addr_equal(src, p->eth_addr);
753}
754
eb1d1641 755static int br_multicast_add_group(struct net_bridge *br,
8ef2a9a5 756 struct net_bridge_port *port,
6db6f0ea
FF		 757 struct br_ip *group,
758 const unsigned char *src)
eb1d1641 759{
e8051688 760 struct net_bridge_port_group __rcu **pp;
5e923585
NA		 761 struct net_bridge_port_group *p;
762 struct net_bridge_mdb_entry *mp;
454594f3 763 unsigned long now = jiffies;
eb1d1641
HX		 764 int err;
765
eb1d1641
HX		 766 spin_lock(&br->multicast_lock);
767 if (!netif_running(br->dev) ||
768 (port && port->state == BR_STATE_DISABLED))
769 goto out;
770
771 mp = br_multicast_new_group(br, port, group);
772 err = PTR_ERR(mp);
4c0833bc 773 if (IS_ERR(mp))
eb1d1641
HX		 774 goto err;
775
776 if (!port) {
2a26028d
AL		 777 if (!mp->host_joined) {
778 mp->host_joined = true;
779 br_mdb_notify(br->dev, NULL, &mp->addr, RTM_NEWMDB, 0);
780 }
454594f3 781 mod_timer(&mp->timer, now + br->multicast_membership_interval);
eb1d1641
HX		 782 goto out;
783 }
784
e8051688
ED		 785 for (pp = &mp->ports;
786 (p = mlock_dereference(*pp, br)) != NULL;
787 pp = &p->next) {
6db6f0ea 788 if (br_port_group_equal(p, port, src))
454594f3 789 goto found;
eb1d1641
HX		 790 if ((unsigned long)p->port < (unsigned long)port)
791 break;
792 }
793
6db6f0ea 794 p = br_multicast_new_port_group(port, group, *pp, 0, src);
eb1d1641
HX		 795 if (unlikely(!p))
796 goto err;
eb1d1641 797 rcu_assign_pointer(*pp, p);
45ebcce5 798 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
eb1d1641 799
454594f3
LL		 800found:
801 mod_timer(&p->timer, now + br->multicast_membership_interval);
eb1d1641
HX		 802out:
803 err = 0;
804
805err:
806 spin_unlock(&br->multicast_lock);
807 return err;
808}
809
8ef2a9a5
YH		 810static int br_ip4_multicast_add_group(struct net_bridge *br,
811 struct net_bridge_port *port,
b0e9a30d 812 __be32 group,
6db6f0ea
FF		 813 __u16 vid,
814 const unsigned char *src)
8ef2a9a5
YH		 815{
816 struct br_ip br_group;
817
818 if (ipv4_is_local_multicast(group))
819 return 0;
820
821 br_group.u.ip4 = group;
822 br_group.proto = htons(ETH_P_IP);
b0e9a30d 823 br_group.vid = vid;
8ef2a9a5 824
6db6f0ea 825 return br_multicast_add_group(br, port, &br_group, src);
8ef2a9a5
YH		 826}
827
dfd56b8b 828#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 829static int br_ip6_multicast_add_group(struct net_bridge *br,
830 struct net_bridge_port *port,
b0e9a30d 831 const struct in6_addr *group,
6db6f0ea
FF		 832 __u16 vid,
833 const unsigned char *src)
08b202b6
YH		 834{
835 struct br_ip br_group;
836
3c3769e6 837 if (ipv6_addr_is_ll_all_nodes(group))
08b202b6
YH		 838 return 0;
839
4e3fd7a0 840 br_group.u.ip6 = *group;
9cc6e0c4 841 br_group.proto = htons(ETH_P_IPV6);
b0e9a30d 842 br_group.vid = vid;
08b202b6 843
6db6f0ea 844 return br_multicast_add_group(br, port, &br_group, src);
08b202b6
YH		 845}
846#endif
847
88c1f37f 848static void br_multicast_router_expired(struct timer_list *t)
eb1d1641 849{
88c1f37f
AP		 850 struct net_bridge_port *port =
851 from_timer(port, t, multicast_router_timer);
eb1d1641
HX		 852 struct net_bridge *br = port->br;
853
854 spin_lock(&br->multicast_lock);
a55d8246
NA		 855 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
856 port->multicast_router == MDB_RTR_TYPE_PERM ||
f12e7d95 857 timer_pending(&port->multicast_router_timer))
eb1d1641
HX		 858 goto out;
859
f12e7d95 860 __del_port_router(port);
eb1d1641
HX		 861out:
862 spin_unlock(&br->multicast_lock);
863}
864
77041420
YG		 865static void br_mc_router_state_change(struct net_bridge *p,
866 bool is_mc_router)
867{
868 struct switchdev_attr attr = {
869 .orig_dev = p->dev,
870 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
871 .flags = SWITCHDEV_F_DEFER,
872 .u.mrouter = is_mc_router,
873 };
874
875 switchdev_port_attr_set(p->dev, &attr);
876}
877
88c1f37f 878static void br_multicast_local_router_expired(struct timer_list *t)
eb1d1641 879{
88c1f37f 880 struct net_bridge *br = from_timer(br, t, multicast_router_timer);
77041420
YG		 881
882 spin_lock(&br->multicast_lock);
883 if (br->multicast_router == MDB_RTR_TYPE_DISABLED ||
884 br->multicast_router == MDB_RTR_TYPE_PERM ||
885 timer_pending(&br->multicast_router_timer))
886 goto out;
887
888 br_mc_router_state_change(br, false);
889out:
890 spin_unlock(&br->multicast_lock);
eb1d1641
HX		 891}
892
cc0fdd80 893static void br_multicast_querier_expired(struct net_bridge *br,
90010b36 894 struct bridge_mcast_own_query *query)
c83b8fab 895{
c83b8fab
HX		 896 spin_lock(&br->multicast_lock);
897 if (!netif_running(br->dev) || br->multicast_disabled)
898 goto out;
899
cc0fdd80 900 br_multicast_start_querier(br, query);
c83b8fab
HX		 901
902out:
903 spin_unlock(&br->multicast_lock);
904}
905
88c1f37f 906static void br_ip4_multicast_querier_expired(struct timer_list *t)
cc0fdd80 907{
88c1f37f 908 struct net_bridge *br = from_timer(br, t, ip4_other_query.timer);
cc0fdd80 909
90010b36 910 br_multicast_querier_expired(br, &br->ip4_own_query);
cc0fdd80
LL		 911}
912
913#if IS_ENABLED(CONFIG_IPV6)
88c1f37f 914static void br_ip6_multicast_querier_expired(struct timer_list *t)
cc0fdd80 915{
88c1f37f 916 struct net_bridge *br = from_timer(br, t, ip6_other_query.timer);
cc0fdd80 917
90010b36 918 br_multicast_querier_expired(br, &br->ip6_own_query);
cc0fdd80
LL		 919}
920#endif
921
dc4eb53a
LL		 922static void br_multicast_select_own_querier(struct net_bridge *br,
923 struct br_ip *ip,
924 struct sk_buff *skb)
925{
926 if (ip->proto == htons(ETH_P_IP))
927 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
928#if IS_ENABLED(CONFIG_IPV6)
929 else
930 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
931#endif
932}
933
8ef2a9a5
YH		 934static void __br_multicast_send_query(struct net_bridge *br,
935 struct net_bridge_port *port,
936 struct br_ip *ip)
eb1d1641 937{
eb1d1641 938 struct sk_buff *skb;
1080ab95 939 u8 igmp_type;
eb1d1641 940
1080ab95 941 skb = br_multicast_alloc_query(br, ip, &igmp_type);
eb1d1641 942 if (!skb)
8ef2a9a5 943 return;
eb1d1641
HX		 944
945 if (port) {
eb1d1641 946 skb->dev = port->dev;
a65056ec 947 br_multicast_count(br, port, skb, igmp_type,
1080ab95 948 BR_MCAST_DIR_TX);
29a26a56
EB		 949 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
950 dev_net(port->dev), NULL, skb, NULL, skb->dev,
f0b4eece 951 br_dev_queue_push_xmit);
dc4eb53a
LL		 952 } else {
953 br_multicast_select_own_querier(br, ip, skb);
a65056ec 954 br_multicast_count(br, port, skb, igmp_type,
1080ab95 955 BR_MCAST_DIR_RX);
eb1d1641 956 netif_rx(skb);
dc4eb53a 957 }
8ef2a9a5
YH		 958}
959
960static void br_multicast_send_query(struct net_bridge *br,
cc0fdd80 961 struct net_bridge_port *port,
90010b36 962 struct bridge_mcast_own_query *own_query)
8ef2a9a5 963{
90010b36 964 struct bridge_mcast_other_query *other_query = NULL;
5e923585
NA		 965 struct br_ip br_group;
966 unsigned long time;
8ef2a9a5
YH		 967
968 if (!netif_running(br->dev) || br->multicast_disabled ||
cc0fdd80 969 !br->multicast_querier)
8ef2a9a5
YH		 970 return;
971
08b202b6
YH		 972 memset(&br_group.u, 0, sizeof(br_group.u));
973
90010b36
LL		 974 if (port ? (own_query == &port->ip4_own_query) :
975 (own_query == &br->ip4_own_query)) {
976 other_query = &br->ip4_other_query;
cc0fdd80 977 br_group.proto = htons(ETH_P_IP);
dfd56b8b 978#if IS_ENABLED(CONFIG_IPV6)
cc0fdd80 979 } else {
90010b36 980 other_query = &br->ip6_other_query;
cc0fdd80 981 br_group.proto = htons(ETH_P_IPV6);
08b202b6 982#endif
cc0fdd80
LL		 983 }
984
90010b36 985 if (!other_query || timer_pending(&other_query->timer))
cc0fdd80
LL		 986 return;
987
988 __br_multicast_send_query(br, port, &br_group);
eb1d1641 989
eb1d1641 990 time = jiffies;
90010b36 991 time += own_query->startup_sent < br->multicast_startup_query_count ?
eb1d1641
HX		 992 br->multicast_startup_query_interval :
993 br->multicast_query_interval;
90010b36 994 mod_timer(&own_query->timer, time);
eb1d1641
HX		 995}
996
90010b36
LL		 997static void
998br_multicast_port_query_expired(struct net_bridge_port *port,
999 struct bridge_mcast_own_query *query)
eb1d1641 1000{
eb1d1641
HX		 1001 struct net_bridge *br = port->br;
1002
1003 spin_lock(&br->multicast_lock);
02a780c0
DC		 1004 if (port->state == BR_STATE_DISABLED ||
1005 port->state == BR_STATE_BLOCKING)
eb1d1641
HX		 1006 goto out;
1007
cc0fdd80
LL		 1008 if (query->startup_sent < br->multicast_startup_query_count)
1009 query->startup_sent++;
eb1d1641 1010
cc0fdd80 1011 br_multicast_send_query(port->br, port, query);
eb1d1641
HX		 1012
1013out:
1014 spin_unlock(&br->multicast_lock);
1015}
1016
88c1f37f 1017static void br_ip4_multicast_port_query_expired(struct timer_list *t)
cc0fdd80 1018{
88c1f37f 1019 struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer);
cc0fdd80 1020
90010b36 1021 br_multicast_port_query_expired(port, &port->ip4_own_query);
cc0fdd80
LL		 1022}
1023
1024#if IS_ENABLED(CONFIG_IPV6)
88c1f37f 1025static void br_ip6_multicast_port_query_expired(struct timer_list *t)
cc0fdd80 1026{
88c1f37f 1027 struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer);
cc0fdd80 1028
90010b36 1029 br_multicast_port_query_expired(port, &port->ip6_own_query);
cc0fdd80
LL		 1030}
1031#endif
1032
147c1e9b
NF		 1033static void br_mc_disabled_update(struct net_device *dev, bool value)
1034{
1035 struct switchdev_attr attr = {
1036 .orig_dev = dev,
1037 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
1038 .flags = SWITCHDEV_F_DEFER,
1039 .u.mc_disabled = value,
1040 };
1041
1042 switchdev_port_attr_set(dev, &attr);
1043}
1044
1080ab95 1045int br_multicast_add_port(struct net_bridge_port *port)
eb1d1641 1046{
7f0aec7a 1047 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
eb1d1641 1048
88c1f37f
AP		 1049 timer_setup(&port->multicast_router_timer,
1050 br_multicast_router_expired, 0);
1051 timer_setup(&port->ip4_own_query.timer,
1052 br_ip4_multicast_port_query_expired, 0);
cc0fdd80 1053#if IS_ENABLED(CONFIG_IPV6)
88c1f37f
AP		 1054 timer_setup(&port->ip6_own_query.timer,
1055 br_ip6_multicast_port_query_expired, 0);
cc0fdd80 1056#endif
147c1e9b
NF		 1057 br_mc_disabled_update(port->dev, port->br->multicast_disabled);
1058
1080ab95
NA		 1059 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
1060 if (!port->mcast_stats)
1061 return -ENOMEM;
1062
1063 return 0;
eb1d1641
HX		 1064}
1065
1066void br_multicast_del_port(struct net_bridge_port *port)
1067{
e10177ab
SA		 1068 struct net_bridge *br = port->br;
1069 struct net_bridge_port_group *pg;
1070 struct hlist_node *n;
1071
1072 /* Take care of the remaining groups, only perm ones should be left */
1073 spin_lock_bh(&br->multicast_lock);
1074 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1075 br_multicast_del_pg(br, pg);
1076 spin_unlock_bh(&br->multicast_lock);
eb1d1641 1077 del_timer_sync(&port->multicast_router_timer);
1080ab95 1078 free_percpu(port->mcast_stats);
eb1d1641
HX		 1079}
1080
90010b36 1081static void br_multicast_enable(struct bridge_mcast_own_query *query)
561f1103 1082{
cc0fdd80 1083 query->startup_sent = 0;
561f1103 1084
cc0fdd80
LL		 1085 if (try_to_del_timer_sync(&query->timer) >= 0 ||
1086 del_timer(&query->timer))
1087 mod_timer(&query->timer, jiffies);
561f1103
HX		 1088}
1089
7cb3f921 1090static void __br_multicast_enable_port(struct net_bridge_port *port)
eb1d1641
HX		 1091{
1092 struct net_bridge *br = port->br;
1093
eb1d1641 1094 if (br->multicast_disabled || !netif_running(br->dev))
7cb3f921 1095 return;
eb1d1641 1096
90010b36 1097 br_multicast_enable(&port->ip4_own_query);
cc0fdd80 1098#if IS_ENABLED(CONFIG_IPV6)
90010b36 1099 br_multicast_enable(&port->ip6_own_query);
cc0fdd80 1100#endif
7f0aec7a
NA		 1101 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
1102 hlist_unhashed(&port->rlist))
754bc547 1103 br_multicast_add_router(br, port);
7cb3f921 1104}
eb1d1641 1105
7cb3f921
NA		 1106void br_multicast_enable_port(struct net_bridge_port *port)
1107{
1108 struct net_bridge *br = port->br;
1109
1110 spin_lock(&br->multicast_lock);
1111 __br_multicast_enable_port(port);
eb1d1641
HX		 1112 spin_unlock(&br->multicast_lock);
1113}
1114
1115void br_multicast_disable_port(struct net_bridge_port *port)
1116{
1117 struct net_bridge *br = port->br;
1118 struct net_bridge_port_group *pg;
b67bfe0d 1119 struct hlist_node *n;
eb1d1641
HX		 1120
1121 spin_lock(&br->multicast_lock);
b67bfe0d 1122 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
9d06b6d8 1123 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
e10177ab 1124 br_multicast_del_pg(br, pg);
eb1d1641 1125
f12e7d95
NF		 1126 __del_port_router(port);
1127
eb1d1641 1128 del_timer(&port->multicast_router_timer);
90010b36 1129 del_timer(&port->ip4_own_query.timer);
cc0fdd80 1130#if IS_ENABLED(CONFIG_IPV6)
90010b36 1131 del_timer(&port->ip6_own_query.timer);
cc0fdd80 1132#endif
eb1d1641
HX		 1133 spin_unlock(&br->multicast_lock);
1134}
1135
8ef2a9a5
YH		 1136static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1137 struct net_bridge_port *port,
06499098
VY		 1138 struct sk_buff *skb,
1139 u16 vid)
eb1d1641 1140{
6db6f0ea 1141 const unsigned char *src;
eb1d1641
HX		 1142 struct igmpv3_report *ih;
1143 struct igmpv3_grec *grec;
1144 int i;
1145 int len;
1146 int num;
1147 int type;
1148 int err = 0;
1149 __be32 group;
0c537291 1150 u16 nsrcs;
eb1d1641 1151
eb1d1641
HX		 1152 ih = igmpv3_report_hdr(skb);
1153 num = ntohs(ih->ngrec);
c2d4fbd2 1154 len = skb_transport_offset(skb) + sizeof(*ih);
eb1d1641
HX		 1155
1156 for (i = 0; i < num; i++) {
1157 len += sizeof(*grec);
1158 if (!pskb_may_pull(skb, len))
1159 return -EINVAL;
1160
fd218cf9 1161 grec = (void *)(skb->data + len - sizeof(*grec));
eb1d1641
HX		 1162 group = grec->grec_mca;
1163 type = grec->grec_type;
0c537291 1164 nsrcs = ntohs(grec->grec_nsrcs);
eb1d1641 1165
0c537291 1166 len += nsrcs * 4;
eb1d1641
HX		 1167 if (!pskb_may_pull(skb, len))
1168 return -EINVAL;
1169
1170 /* We treat this as an IGMPv2 report for now. */
1171 switch (type) {
1172 case IGMPV3_MODE_IS_INCLUDE:
1173 case IGMPV3_MODE_IS_EXCLUDE:
1174 case IGMPV3_CHANGE_TO_INCLUDE:
1175 case IGMPV3_CHANGE_TO_EXCLUDE:
1176 case IGMPV3_ALLOW_NEW_SOURCES:
1177 case IGMPV3_BLOCK_OLD_SOURCES:
1178 break;
1179
1180 default:
1181 continue;
1182 }
1183
6db6f0ea 1184 src = eth_hdr(skb)->h_source;
bc8c20ac
SA		 1185 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1186 type == IGMPV3_MODE_IS_INCLUDE) &&
0c537291 1187 nsrcs == 0) {
6db6f0ea 1188 br_ip4_multicast_leave_group(br, port, group, vid, src);
bc8c20ac 1189 } else {
6db6f0ea
FF		 1190 err = br_ip4_multicast_add_group(br, port, group, vid,
1191 src);
bc8c20ac
SA		 1192 if (err)
1193 break;
1194 }
eb1d1641
HX		 1195 }
1196
1197 return err;
1198}
1199
dfd56b8b 1200#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1201static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1202 struct net_bridge_port *port,
06499098
VY		 1203 struct sk_buff *skb,
1204 u16 vid)
08b202b6 1205{
6db6f0ea 1206 const unsigned char *src;
08b202b6
YH		 1207 struct icmp6hdr *icmp6h;
1208 struct mld2_grec *grec;
1209 int i;
1210 int len;
1211 int num;
1212 int err = 0;
1213
1214 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1215 return -EINVAL;
1216
1217 icmp6h = icmp6_hdr(skb);
1218 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
c2d4fbd2 1219 len = skb_transport_offset(skb) + sizeof(*icmp6h);
08b202b6
YH		 1220
1221 for (i = 0; i < num; i++) {
0c537291
NA		 1222 __be16 *_nsrcs, __nsrcs;
1223 u16 nsrcs;
1224
1225 _nsrcs = skb_header_pointer(skb,
1226 len + offsetof(struct mld2_grec,
1227 grec_nsrcs),
1228 sizeof(__nsrcs), &__nsrcs);
1229 if (!_nsrcs)
08b202b6
YH		 1230 return -EINVAL;
1231
0c537291
NA		 1232 nsrcs = ntohs(*_nsrcs);
1233
08b202b6
YH		 1234 if (!pskb_may_pull(skb,
1235 len + sizeof(*grec) +
0c537291 1236 sizeof(struct in6_addr) * nsrcs))
08b202b6
YH		 1237 return -EINVAL;
1238
1239 grec = (struct mld2_grec *)(skb->data + len);
d41db9f3 1240 len += sizeof(*grec) +
0c537291 1241 sizeof(struct in6_addr) * nsrcs;
08b202b6
YH		 1242
1243 /* We treat these as MLDv1 reports for now. */
1244 switch (grec->grec_type) {
1245 case MLD2_MODE_IS_INCLUDE:
1246 case MLD2_MODE_IS_EXCLUDE:
1247 case MLD2_CHANGE_TO_INCLUDE:
1248 case MLD2_CHANGE_TO_EXCLUDE:
1249 case MLD2_ALLOW_NEW_SOURCES:
1250 case MLD2_BLOCK_OLD_SOURCES:
1251 break;
1252
1253 default:
1254 continue;
1255 }
1256
6db6f0ea 1257 src = eth_hdr(skb)->h_source;
bc8c20ac
SA		 1258 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1259 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
0c537291 1260 nsrcs == 0) {
bc8c20ac 1261 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
6db6f0ea 1262 vid, src);
bc8c20ac
SA		 1263 } else {
1264 err = br_ip6_multicast_add_group(br, port,
6db6f0ea
FF		 1265 &grec->grec_mca, vid,
1266 src);
9264251e 1267 if (err)
bc8c20ac
SA		 1268 break;
1269 }
08b202b6
YH		 1270 }
1271
1272 return err;
1273}
1274#endif
1275
dc4eb53a 1276static bool br_ip4_multicast_select_querier(struct net_bridge *br,
2cd41431 1277 struct net_bridge_port *port,
dc4eb53a
LL		 1278 __be32 saddr)
1279{
1280 if (!timer_pending(&br->ip4_own_query.timer) &&
1281 !timer_pending(&br->ip4_other_query.timer))
1282 goto update;
1283
1284 if (!br->ip4_querier.addr.u.ip4)
1285 goto update;
1286
1287 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1288 goto update;
1289
1290 return false;
1291
1292update:
1293 br->ip4_querier.addr.u.ip4 = saddr;
1294
2cd41431
LL		 1295 /* update protected by general multicast_lock by caller */
1296 rcu_assign_pointer(br->ip4_querier.port, port);
1297
dc4eb53a
LL		 1298 return true;
1299}
1300
1301#if IS_ENABLED(CONFIG_IPV6)
1302static bool br_ip6_multicast_select_querier(struct net_bridge *br,
2cd41431 1303 struct net_bridge_port *port,
dc4eb53a
LL		 1304 struct in6_addr *saddr)
1305{
1306 if (!timer_pending(&br->ip6_own_query.timer) &&
1307 !timer_pending(&br->ip6_other_query.timer))
1308 goto update;
1309
1310 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1311 goto update;
1312
1313 return false;
1314
1315update:
1316 br->ip6_querier.addr.u.ip6 = *saddr;
1317
2cd41431
LL		 1318 /* update protected by general multicast_lock by caller */
1319 rcu_assign_pointer(br->ip6_querier.port, port);
1320
dc4eb53a
LL		 1321 return true;
1322}
1323#endif
1324
1325static bool br_multicast_select_querier(struct net_bridge *br,
2cd41431 1326 struct net_bridge_port *port,
dc4eb53a
LL		 1327 struct br_ip *saddr)
1328{
1329 switch (saddr->proto) {
1330 case htons(ETH_P_IP):
2cd41431 1331 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
dc4eb53a
LL		 1332#if IS_ENABLED(CONFIG_IPV6)
1333 case htons(ETH_P_IPV6):
2cd41431 1334 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
dc4eb53a
LL		 1335#endif
1336 }
1337
1338 return false;
1339}
1340
cc0fdd80 1341static void
90010b36
LL		 1342br_multicast_update_query_timer(struct net_bridge *br,
1343 struct bridge_mcast_other_query *query,
1344 unsigned long max_delay)
b00589af 1345{
90010b36
LL		 1346 if (!timer_pending(&query->timer))
1347 query->delay_time = jiffies + max_delay;
b00589af 1348
90010b36 1349 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
b00589af
LL		 1350}
1351
6d549648
NF		 1352static void br_port_mc_router_state_change(struct net_bridge_port *p,
1353 bool is_mc_router)
1354{
1355 struct switchdev_attr attr = {
1356 .orig_dev = p->dev,
1357 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
1358 .flags = SWITCHDEV_F_DEFER,
1359 .u.mrouter = is_mc_router,
1360 };
1361
1362 switchdev_port_attr_set(p->dev, &attr);
1363}
1364
7e80c124 1365/*
7c77602f 1366 * Add port to router_list
7e80c124 1367 * list is maintained ordered by pointer value
1368 * and locked by br->multicast_lock and RCU
1369 */
0909e117
HX		 1370static void br_multicast_add_router(struct net_bridge *br,
1371 struct net_bridge_port *port)
1372{
dcdca2c4 1373 struct net_bridge_port *p;
b67bfe0d 1374 struct hlist_node *slot = NULL;
dcdca2c4 1375
1a040eac
NA		 1376 if (!hlist_unhashed(&port->rlist))
1377 return;
1378
b67bfe0d 1379 hlist_for_each_entry(p, &br->router_list, rlist) {
7e80c124 1380 if ((unsigned long) port >= (unsigned long) p)
1381 break;
b67bfe0d 1382 slot = &p->rlist;
dcdca2c4 1383 }
1384
7e80c124 1385 if (slot)
1d023284 1386 hlist_add_behind_rcu(&port->rlist, slot);
dcdca2c4 1387 else
1388 hlist_add_head_rcu(&port->rlist, &br->router_list);
949f1e39 1389 br_rtr_notify(br->dev, port, RTM_NEWMDB);
6d549648 1390 br_port_mc_router_state_change(port, true);
0909e117
HX		 1391}
1392
eb1d1641
HX		 1393static void br_multicast_mark_router(struct net_bridge *br,
1394 struct net_bridge_port *port)
1395{
1396 unsigned long now = jiffies;
eb1d1641
HX		 1397
1398 if (!port) {
77041420
YG		 1399 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
1400 if (!timer_pending(&br->multicast_router_timer))
1401 br_mc_router_state_change(br, true);
eb1d1641
HX		 1402 mod_timer(&br->multicast_router_timer,
1403 now + br->multicast_querier_interval);
77041420 1404 }
eb1d1641
HX		 1405 return;
1406 }
1407
a55d8246
NA		 1408 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1409 port->multicast_router == MDB_RTR_TYPE_PERM)
eb1d1641
HX		 1410 return;
1411
0909e117 1412 br_multicast_add_router(br, port);
eb1d1641 1413
eb1d1641
HX		 1414 mod_timer(&port->multicast_router_timer,
1415 now + br->multicast_querier_interval);
1416}
1417
1418static void br_multicast_query_received(struct net_bridge *br,
1419 struct net_bridge_port *port,
90010b36 1420 struct bridge_mcast_other_query *query,
dc4eb53a 1421 struct br_ip *saddr,
b00589af 1422 unsigned long max_delay)
eb1d1641 1423{
2cd41431 1424 if (!br_multicast_select_querier(br, port, saddr))
eb1d1641
HX		 1425 return;
1426
dc4eb53a 1427 br_multicast_update_query_timer(br, query, max_delay);
cf2606c6 1428 br_multicast_mark_router(br, port);
eb1d1641
HX		 1429}
1430
8ef2a9a5
YH		 1431static int br_ip4_multicast_query(struct net_bridge *br,
1432 struct net_bridge_port *port,
06499098
VY		 1433 struct sk_buff *skb,
1434 u16 vid)
eb1d1641 1435{
b71d1d42 1436 const struct iphdr *iph = ip_hdr(skb);
eb1d1641
HX		 1437 struct igmphdr *ih = igmp_hdr(skb);
1438 struct net_bridge_mdb_entry *mp;
1439 struct igmpv3_query *ih3;
1440 struct net_bridge_port_group *p;
e8051688 1441 struct net_bridge_port_group __rcu **pp;
dc4eb53a 1442 struct br_ip saddr;
eb1d1641
HX		 1443 unsigned long max_delay;
1444 unsigned long now = jiffies;
856ce5d0 1445 unsigned int offset = skb_transport_offset(skb);
eb1d1641 1446 __be32 group;
bec68ff1 1447 int err = 0;
eb1d1641
HX		 1448
1449 spin_lock(&br->multicast_lock);
1450 if (!netif_running(br->dev) ||
1451 (port && port->state == BR_STATE_DISABLED))
1452 goto out;
1453
eb1d1641
HX		 1454 group = ih->group;
1455
856ce5d0 1456 if (skb->len == offset + sizeof(*ih)) {
eb1d1641
HX		 1457 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1458
1459 if (!max_delay) {
1460 max_delay = 10 * HZ;
1461 group = 0;
1462 }
856ce5d0 1463 } else if (skb->len >= offset + sizeof(*ih3)) {
eb1d1641
HX		 1464 ih3 = igmpv3_query_hdr(skb);
1465 if (ih3->nsrcs)
bec68ff1 1466 goto out;
eb1d1641 1467
0ba8c9ec
YH		 1468 max_delay = ih3->code ?
1469 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
9afd85c9 1470 } else {
9ed973cc
LL		 1471 goto out;
1472 }
1473
dc4eb53a
LL		 1474 if (!group) {
1475 saddr.proto = htons(ETH_P_IP);
1476 saddr.u.ip4 = iph->saddr;
b00589af 1477
dc4eb53a
LL		 1478 br_multicast_query_received(br, port, &br->ip4_other_query,
1479 &saddr, max_delay);
eb1d1641 1480 goto out;
dc4eb53a 1481 }
eb1d1641 1482
b0e9a30d 1483 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
eb1d1641
HX		 1484 if (!mp)
1485 goto out;
1486
1487 max_delay *= br->multicast_last_member_count;
1488
ff0fd34e 1489 if (mp->host_joined &&
eb1d1641
HX		 1490 (timer_pending(&mp->timer) ?
1491 time_after(mp->timer.expires, now + max_delay) :
1492 try_to_del_timer_sync(&mp->timer) >= 0))
1493 mod_timer(&mp->timer, now + max_delay);
1494
e8051688
ED		 1495 for (pp = &mp->ports;
1496 (p = mlock_dereference(*pp, br)) != NULL;
1497 pp = &p->next) {
eb1d1641
HX		 1498 if (timer_pending(&p->timer) ?
1499 time_after(p->timer.expires, now + max_delay) :
1500 try_to_del_timer_sync(&p->timer) >= 0)
24f9cdcb 1501 mod_timer(&p->timer, now + max_delay);
eb1d1641
HX		 1502 }
1503
1504out:
1505 spin_unlock(&br->multicast_lock);
bec68ff1 1506 return err;
eb1d1641
HX		 1507}
1508
dfd56b8b 1509#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1510static int br_ip6_multicast_query(struct net_bridge *br,
1511 struct net_bridge_port *port,
06499098
VY		 1512 struct sk_buff *skb,
1513 u16 vid)
08b202b6 1514{
eca2a43b 1515 struct mld_msg *mld;
08b202b6
YH		 1516 struct net_bridge_mdb_entry *mp;
1517 struct mld2_query *mld2q;
e8051688
ED		 1518 struct net_bridge_port_group *p;
1519 struct net_bridge_port_group __rcu **pp;
dc4eb53a 1520 struct br_ip saddr;
08b202b6
YH		 1521 unsigned long max_delay;
1522 unsigned long now = jiffies;
856ce5d0 1523 unsigned int offset = skb_transport_offset(skb);
b71d1d42 1524 const struct in6_addr *group = NULL;
9ed973cc 1525 bool is_general_query;
08b202b6
YH		 1526 int err = 0;
1527
1528 spin_lock(&br->multicast_lock);
1529 if (!netif_running(br->dev) ||
1530 (port && port->state == BR_STATE_DISABLED))
1531 goto out;
1532
856ce5d0
LL		 1533 if (skb->len == offset + sizeof(*mld)) {
1534 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
08b202b6
YH		 1535 err = -EINVAL;
1536 goto out;
1537 }
1538 mld = (struct mld_msg *) icmp6_hdr(skb);
4715213d 1539 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
08b202b6
YH		 1540 if (max_delay)
1541 group = &mld->mld_mca;
248ba8ec 1542 } else {
856ce5d0 1543 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
08b202b6
YH		 1544 err = -EINVAL;
1545 goto out;
1546 }
1547 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1548 if (!mld2q->mld2q_nsrcs)
1549 group = &mld2q->mld2q_mca;
e3f5b170
DB		 1550
1551 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
08b202b6
YH		 1552 }
1553
9ed973cc
LL		 1554 is_general_query = group && ipv6_addr_any(group);
1555
dc4eb53a
LL		 1556 if (is_general_query) {
1557 saddr.proto = htons(ETH_P_IPV6);
6bd5a523 1558 saddr.u.ip6 = ipv6_hdr(skb)->saddr;
b00589af 1559
dc4eb53a
LL		 1560 br_multicast_query_received(br, port, &br->ip6_other_query,
1561 &saddr, max_delay);
08b202b6 1562 goto out;
6c03ee8b
LL		 1563 } else if (!group) {
1564 goto out;
dc4eb53a 1565 }
08b202b6 1566
b0e9a30d 1567 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
08b202b6
YH		 1568 if (!mp)
1569 goto out;
1570
1571 max_delay *= br->multicast_last_member_count;
ff0fd34e 1572 if (mp->host_joined &&
08b202b6
YH		 1573 (timer_pending(&mp->timer) ?
1574 time_after(mp->timer.expires, now + max_delay) :
1575 try_to_del_timer_sync(&mp->timer) >= 0))
1576 mod_timer(&mp->timer, now + max_delay);
1577
e8051688
ED		 1578 for (pp = &mp->ports;
1579 (p = mlock_dereference(*pp, br)) != NULL;
1580 pp = &p->next) {
08b202b6
YH		 1581 if (timer_pending(&p->timer) ?
1582 time_after(p->timer.expires, now + max_delay) :
1583 try_to_del_timer_sync(&p->timer) >= 0)
24f9cdcb 1584 mod_timer(&p->timer, now + max_delay);
08b202b6
YH		 1585 }
1586
1587out:
1588 spin_unlock(&br->multicast_lock);
1589 return err;
1590}
1591#endif
1592
90010b36
LL		 1593static void
1594br_multicast_leave_group(struct net_bridge *br,
1595 struct net_bridge_port *port,
1596 struct br_ip *group,
1597 struct bridge_mcast_other_query *other_query,
6db6f0ea
FF		 1598 struct bridge_mcast_own_query *own_query,
1599 const unsigned char *src)
eb1d1641
HX		 1600{
1601 struct net_bridge_mdb_htable *mdb;
1602 struct net_bridge_mdb_entry *mp;
1603 struct net_bridge_port_group *p;
1604 unsigned long now;
1605 unsigned long time;
1606
eb1d1641
HX		 1607 spin_lock(&br->multicast_lock);
1608 if (!netif_running(br->dev) ||
544586f7 1609 (port && port->state == BR_STATE_DISABLED))
eb1d1641
HX		 1610 goto out;
1611
e8051688 1612 mdb = mlock_dereference(br->mdb, br);
eb1d1641
HX		 1613 mp = br_mdb_ip_get(mdb, group);
1614 if (!mp)
1615 goto out;
1616
544586f7
SA		 1617 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1618 struct net_bridge_port_group __rcu **pp;
1619
1620 for (pp = &mp->ports;
1621 (p = mlock_dereference(*pp, br)) != NULL;
1622 pp = &p->next) {
6db6f0ea 1623 if (!br_port_group_equal(p, port, src))
544586f7
SA		 1624 continue;
1625
119a710d
NA		 1626 if (p->flags & MDB_PG_FLAGS_PERMANENT)
1627 break;
1628
544586f7
SA		 1629 rcu_assign_pointer(*pp, p->next);
1630 hlist_del_init(&p->mglist);
1631 del_timer(&p->timer);
1632 call_rcu_bh(&p->rcu, br_multicast_free_pg);
45ebcce5
ER		 1633 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1634 p->flags);
544586f7 1635
ff0fd34e 1636 if (!mp->ports && !mp->host_joined &&
544586f7
SA		 1637 netif_running(br->dev))
1638 mod_timer(&mp->timer, jiffies);
1639 }
1640 goto out;
1641 }
1642
1643 if (timer_pending(&other_query->timer))
1644 goto out;
1645
cc0fdd80 1646 if (br->multicast_querier) {
6b7df111
CW		 1647 __br_multicast_send_query(br, port, &mp->addr);
1648
1649 time = jiffies + br->multicast_last_member_count *
1650 br->multicast_last_member_interval;
cc0fdd80 1651
90010b36 1652 mod_timer(&own_query->timer, time);
6b7df111
CW		 1653
1654 for (p = mlock_dereference(mp->ports, br);
1655 p != NULL;
1656 p = mlock_dereference(p->next, br)) {
6db6f0ea 1657 if (!br_port_group_equal(p, port, src))
6b7df111
CW		 1658 continue;
1659
1660 if (!hlist_unhashed(&p->mglist) &&
1661 (timer_pending(&p->timer) ?
1662 time_after(p->timer.expires, time) :
1663 try_to_del_timer_sync(&p->timer) >= 0)) {
1664 mod_timer(&p->timer, time);
1665 }
1666
1667 break;
1668 }
1669 }
1670
eb1d1641
HX		 1671 now = jiffies;
1672 time = now + br->multicast_last_member_count *
1673 br->multicast_last_member_interval;
1674
1675 if (!port) {
ff0fd34e 1676 if (mp->host_joined &&
eb1d1641
HX		 1677 (timer_pending(&mp->timer) ?
1678 time_after(mp->timer.expires, time) :
1679 try_to_del_timer_sync(&mp->timer) >= 0)) {
1680 mod_timer(&mp->timer, time);
eb1d1641 1681 }
454594f3
LL		 1682
1683 goto out;
1684 }
1685
1686 for (p = mlock_dereference(mp->ports, br);
1687 p != NULL;
1688 p = mlock_dereference(p->next, br)) {
1689 if (p->port != port)
1690 continue;
1691
1692 if (!hlist_unhashed(&p->mglist) &&
1693 (timer_pending(&p->timer) ?
1694 time_after(p->timer.expires, time) :
1695 try_to_del_timer_sync(&p->timer) >= 0)) {
1696 mod_timer(&p->timer, time);
1697 }
1698
1699 break;
eb1d1641 1700 }
eb1d1641
HX		 1701out:
1702 spin_unlock(&br->multicast_lock);
1703}
1704
8ef2a9a5
YH		 1705static void br_ip4_multicast_leave_group(struct net_bridge *br,
1706 struct net_bridge_port *port,
b0e9a30d 1707 __be32 group,
6db6f0ea
FF		 1708 __u16 vid,
1709 const unsigned char *src)
8ef2a9a5
YH		 1710{
1711 struct br_ip br_group;
90010b36 1712 struct bridge_mcast_own_query *own_query;
8ef2a9a5
YH		 1713
1714 if (ipv4_is_local_multicast(group))
1715 return;
1716
90010b36
LL		 1717 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1718
8ef2a9a5
YH		 1719 br_group.u.ip4 = group;
1720 br_group.proto = htons(ETH_P_IP);
b0e9a30d 1721 br_group.vid = vid;
8ef2a9a5 1722
90010b36 1723 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
6db6f0ea 1724 own_query, src);
8ef2a9a5
YH		 1725}
1726
dfd56b8b 1727#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1728static void br_ip6_multicast_leave_group(struct net_bridge *br,
1729 struct net_bridge_port *port,
b0e9a30d 1730 const struct in6_addr *group,
6db6f0ea
FF		 1731 __u16 vid,
1732 const unsigned char *src)
08b202b6
YH		 1733{
1734 struct br_ip br_group;
90010b36 1735 struct bridge_mcast_own_query *own_query;
08b202b6 1736
3c3769e6 1737 if (ipv6_addr_is_ll_all_nodes(group))
08b202b6
YH		 1738 return;
1739
90010b36
LL		 1740 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1741
4e3fd7a0 1742 br_group.u.ip6 = *group;
08b202b6 1743 br_group.proto = htons(ETH_P_IPV6);
b0e9a30d 1744 br_group.vid = vid;
08b202b6 1745
90010b36 1746 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
6db6f0ea 1747 own_query, src);
08b202b6
YH		 1748}
1749#endif
8ef2a9a5 1750
1080ab95
NA		 1751static void br_multicast_err_count(const struct net_bridge *br,
1752 const struct net_bridge_port *p,
1753 __be16 proto)
1754{
1755 struct bridge_mcast_stats __percpu *stats;
1756 struct bridge_mcast_stats *pstats;
1757
1758 if (!br->multicast_stats_enabled)
1759 return;
1760
1761 if (p)
1762 stats = p->mcast_stats;
1763 else
1764 stats = br->mcast_stats;
1765 if (WARN_ON(!stats))
1766 return;
1767
1768 pstats = this_cpu_ptr(stats);
1769
1770 u64_stats_update_begin(&pstats->syncp);
1771 switch (proto) {
1772 case htons(ETH_P_IP):
1773 pstats->mstats.igmp_parse_errors++;
1774 break;
1775#if IS_ENABLED(CONFIG_IPV6)
1776 case htons(ETH_P_IPV6):
1777 pstats->mstats.mld_parse_errors++;
1778 break;
1779#endif
1780 }
1781 u64_stats_update_end(&pstats->syncp);
1782}
1783
91b02d3d
NA		 1784static void br_multicast_pim(struct net_bridge *br,
1785 struct net_bridge_port *port,
1786 const struct sk_buff *skb)
1787{
1788 unsigned int offset = skb_transport_offset(skb);
1789 struct pimhdr *pimhdr, _pimhdr;
1790
1791 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1792 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1793 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1794 return;
1795
1796 br_multicast_mark_router(br, port);
1797}
1798
eb1d1641
HX		 1799static int br_multicast_ipv4_rcv(struct net_bridge *br,
1800 struct net_bridge_port *port,
06499098
VY		 1801 struct sk_buff *skb,
1802 u16 vid)
eb1d1641 1803{
9afd85c9 1804 struct sk_buff *skb_trimmed = NULL;
6db6f0ea 1805 const unsigned char *src;
eb1d1641 1806 struct igmphdr *ih;
eb1d1641
HX		 1807 int err;
1808
9afd85c9 1809 err = ip_mc_check_igmp(skb, &skb_trimmed);
eb1d1641 1810
9afd85c9 1811 if (err == -ENOMSG) {
91b02d3d 1812 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
bd4265fe 1813 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
91b02d3d
NA		 1814 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1815 if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1816 br_multicast_pim(br, port, skb);
1817 }
eb1d1641 1818 return 0;
9afd85c9 1819 } else if (err < 0) {
1080ab95 1820 br_multicast_err_count(br, port, skb->protocol);
9afd85c9 1821 return err;
bd4265fe 1822 }
eb1d1641 1823
9afd85c9 1824 ih = igmp_hdr(skb);
6db6f0ea 1825 src = eth_hdr(skb)->h_source;
1080ab95 1826 BR_INPUT_SKB_CB(skb)->igmp = ih->type;
eb1d1641
HX		 1827
1828 switch (ih->type) {
1829 case IGMP_HOST_MEMBERSHIP_REPORT:
1830 case IGMPV2_HOST_MEMBERSHIP_REPORT:
62b2bcb4 1831 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
6db6f0ea 1832 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
eb1d1641
HX		 1833 break;
1834 case IGMPV3_HOST_MEMBERSHIP_REPORT:
9afd85c9 1835 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
eb1d1641
HX		 1836 break;
1837 case IGMP_HOST_MEMBERSHIP_QUERY:
9afd85c9 1838 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
eb1d1641
HX		 1839 break;
1840 case IGMP_HOST_LEAVE_MESSAGE:
6db6f0ea 1841 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
eb1d1641
HX		 1842 break;
1843 }
1844
a516993f 1845 if (skb_trimmed && skb_trimmed != skb)
9afd85c9
LL		 1846 kfree_skb(skb_trimmed);
1847
a65056ec 1848 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1080ab95
NA		 1849 BR_MCAST_DIR_RX);
1850
eb1d1641
HX		 1851 return err;
1852}
1853
dfd56b8b 1854#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1855static int br_multicast_ipv6_rcv(struct net_bridge *br,
1856 struct net_bridge_port *port,
06499098
VY		 1857 struct sk_buff *skb,
1858 u16 vid)
08b202b6 1859{
9afd85c9 1860 struct sk_buff *skb_trimmed = NULL;
6db6f0ea 1861 const unsigned char *src;
9afd85c9 1862 struct mld_msg *mld;
08b202b6
YH		 1863 int err;
1864
9afd85c9 1865 err = ipv6_mc_check_mld(skb, &skb_trimmed);
08b202b6 1866
9afd85c9
LL		 1867 if (err == -ENOMSG) {
1868 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1869 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
08b202b6 1870 return 0;
9afd85c9 1871 } else if (err < 0) {
1080ab95 1872 br_multicast_err_count(br, port, skb->protocol);
9afd85c9 1873 return err;
08b202b6
YH		 1874 }
1875
9afd85c9 1876 mld = (struct mld_msg *)skb_transport_header(skb);
1080ab95 1877 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
08b202b6 1878
9afd85c9 1879 switch (mld->mld_type) {
08b202b6 1880 case ICMPV6_MGM_REPORT:
6db6f0ea 1881 src = eth_hdr(skb)->h_source;
fc2af6c7 1882 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
6db6f0ea
FF		 1883 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
1884 src);
08b202b6 1885 break;
08b202b6 1886 case ICMPV6_MLD2_REPORT:
9afd85c9 1887 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
08b202b6
YH		 1888 break;
1889 case ICMPV6_MGM_QUERY:
9afd85c9 1890 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
08b202b6
YH		 1891 break;
1892 case ICMPV6_MGM_REDUCTION:
6db6f0ea
FF		 1893 src = eth_hdr(skb)->h_source;
1894 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
9afd85c9 1895 break;
08b202b6
YH		 1896 }
1897
a516993f 1898 if (skb_trimmed && skb_trimmed != skb)
9afd85c9
LL		 1899 kfree_skb(skb_trimmed);
1900
a65056ec 1901 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1080ab95
NA		 1902 BR_MCAST_DIR_RX);
1903
08b202b6
YH		 1904 return err;
1905}
1906#endif
1907
eb1d1641 1908int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
06499098 1909 struct sk_buff *skb, u16 vid)
eb1d1641 1910{
1080ab95
NA		 1911 int ret = 0;
1912
1fafc7a9
YH		 1913 BR_INPUT_SKB_CB(skb)->igmp = 0;
1914 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1915
eb1d1641
HX		 1916 if (br->multicast_disabled)
1917 return 0;
1918
1919 switch (skb->protocol) {
1920 case htons(ETH_P_IP):
1080ab95
NA		 1921 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1922 break;
dfd56b8b 1923#if IS_ENABLED(CONFIG_IPV6)
08b202b6 1924 case htons(ETH_P_IPV6):
1080ab95
NA		 1925 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1926 break;
08b202b6 1927#endif
eb1d1641
HX		 1928 }
1929
1080ab95 1930 return ret;
eb1d1641
HX		 1931}
1932
cc0fdd80 1933static void br_multicast_query_expired(struct net_bridge *br,
2cd41431
LL		 1934 struct bridge_mcast_own_query *query,
1935 struct bridge_mcast_querier *querier)
cc0fdd80
LL		 1936{
1937 spin_lock(&br->multicast_lock);
1938 if (query->startup_sent < br->multicast_startup_query_count)
1939 query->startup_sent++;
1940
71d9f614 1941 RCU_INIT_POINTER(querier->port, NULL);
cc0fdd80
LL		 1942 br_multicast_send_query(br, NULL, query);
1943 spin_unlock(&br->multicast_lock);
1944}
1945
88c1f37f 1946static void br_ip4_multicast_query_expired(struct timer_list *t)
eb1d1641 1947{
88c1f37f 1948 struct net_bridge *br = from_timer(br, t, ip4_own_query.timer);
eb1d1641 1949
2cd41431 1950 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
cc0fdd80 1951}
eb1d1641 1952
cc0fdd80 1953#if IS_ENABLED(CONFIG_IPV6)
88c1f37f 1954static void br_ip6_multicast_query_expired(struct timer_list *t)
cc0fdd80 1955{
88c1f37f 1956 struct net_bridge *br = from_timer(br, t, ip6_own_query.timer);
eb1d1641 1957
2cd41431 1958 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
eb1d1641 1959}
cc0fdd80 1960#endif
eb1d1641
HX		 1961
1962void br_multicast_init(struct net_bridge *br)
1963{
1964 br->hash_elasticity = 4;
1965 br->hash_max = 512;
1966
7f0aec7a 1967 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
c5c23260 1968 br->multicast_querier = 0;
1c8ad5bf 1969 br->multicast_query_use_ifaddr = 0;
eb1d1641
HX		 1970 br->multicast_last_member_count = 2;
1971 br->multicast_startup_query_count = 2;
1972
1973 br->multicast_last_member_interval = HZ;
1974 br->multicast_query_response_interval = 10 * HZ;
1975 br->multicast_startup_query_interval = 125 * HZ / 4;
1976 br->multicast_query_interval = 125 * HZ;
1977 br->multicast_querier_interval = 255 * HZ;
1978 br->multicast_membership_interval = 260 * HZ;
1979
90010b36 1980 br->ip4_other_query.delay_time = 0;
2cd41431 1981 br->ip4_querier.port = NULL;
aa2ae3e7 1982 br->multicast_igmp_version = 2;
cc0fdd80 1983#if IS_ENABLED(CONFIG_IPV6)
aa2ae3e7 1984 br->multicast_mld_version = 1;
90010b36 1985 br->ip6_other_query.delay_time = 0;
2cd41431 1986 br->ip6_querier.port = NULL;
cc0fdd80 1987#endif
0888d5f3 1988 br->has_ipv6_addr = 1;
b00589af 1989
eb1d1641 1990 spin_lock_init(&br->multicast_lock);
88c1f37f
AP		 1991 timer_setup(&br->multicast_router_timer,
1992 br_multicast_local_router_expired, 0);
1993 timer_setup(&br->ip4_other_query.timer,
1994 br_ip4_multicast_querier_expired, 0);
1995 timer_setup(&br->ip4_own_query.timer,
1996 br_ip4_multicast_query_expired, 0);
cc0fdd80 1997#if IS_ENABLED(CONFIG_IPV6)
88c1f37f
AP		 1998 timer_setup(&br->ip6_other_query.timer,
1999 br_ip6_multicast_querier_expired, 0);
2000 timer_setup(&br->ip6_own_query.timer,
2001 br_ip6_multicast_query_expired, 0);
cc0fdd80 2002#endif
eb1d1641
HX		 2003}
2004
cc0fdd80 2005static void __br_multicast_open(struct net_bridge *br,
90010b36 2006 struct bridge_mcast_own_query *query)
eb1d1641 2007{
cc0fdd80 2008 query->startup_sent = 0;
eb1d1641
HX		 2009
2010 if (br->multicast_disabled)
2011 return;
2012
cc0fdd80
LL		 2013 mod_timer(&query->timer, jiffies);
2014}
2015
2016void br_multicast_open(struct net_bridge *br)
2017{
90010b36 2018 __br_multicast_open(br, &br->ip4_own_query);
cc0fdd80 2019#if IS_ENABLED(CONFIG_IPV6)
90010b36 2020 __br_multicast_open(br, &br->ip6_own_query);
cc0fdd80 2021#endif
eb1d1641
HX		 2022}
2023
2024void br_multicast_stop(struct net_bridge *br)
2025{
eb1d1641 2026 del_timer_sync(&br->multicast_router_timer);
90010b36
LL		 2027 del_timer_sync(&br->ip4_other_query.timer);
2028 del_timer_sync(&br->ip4_own_query.timer);
cc0fdd80 2029#if IS_ENABLED(CONFIG_IPV6)
90010b36
LL		 2030 del_timer_sync(&br->ip6_other_query.timer);
2031 del_timer_sync(&br->ip6_own_query.timer);
cc0fdd80 2032#endif
e10177ab
SA		 2033}
2034
2035void br_multicast_dev_del(struct net_bridge *br)
2036{
2037 struct net_bridge_mdb_htable *mdb;
2038 struct net_bridge_mdb_entry *mp;
2039 struct hlist_node *n;
2040 u32 ver;
2041 int i;
eb1d1641
HX		 2042
2043 spin_lock_bh(&br->multicast_lock);
e8051688 2044 mdb = mlock_dereference(br->mdb, br);
eb1d1641
HX		 2045 if (!mdb)
2046 goto out;
2047
2048 br->mdb = NULL;
2049
2050 ver = mdb->ver;
2051 for (i = 0; i < mdb->max; i++) {
b67bfe0d 2052 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
eb1d1641
HX		 2053 hlist[ver]) {
2054 del_timer(&mp->timer);
eb1d1641
HX		 2055 call_rcu_bh(&mp->rcu, br_multicast_free_group);
2056 }
2057 }
2058
2059 if (mdb->old) {
2060 spin_unlock_bh(&br->multicast_lock);
10cc2b50 2061 rcu_barrier_bh();
eb1d1641
HX		 2062 spin_lock_bh(&br->multicast_lock);
2063 WARN_ON(mdb->old);
2064 }
2065
2066 mdb->old = mdb;
2067 call_rcu_bh(&mdb->rcu, br_mdb_free);
2068
2069out:
2070 spin_unlock_bh(&br->multicast_lock);
2071}
0909e117
HX		 2072
2073int br_multicast_set_router(struct net_bridge *br, unsigned long val)
2074{
6ae4ae8e 2075 int err = -EINVAL;
0909e117
HX		 2076
2077 spin_lock_bh(&br->multicast_lock);
0909e117
HX		 2078
2079 switch (val) {
7f0aec7a
NA		 2080 case MDB_RTR_TYPE_DISABLED:
2081 case MDB_RTR_TYPE_PERM:
77041420 2082 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM);
0909e117 2083 del_timer(&br->multicast_router_timer);
77041420
YG		 2084 br->multicast_router = val;
2085 err = 0;
2086 break;
7f0aec7a 2087 case MDB_RTR_TYPE_TEMP_QUERY:
77041420
YG		 2088 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
2089 br_mc_router_state_change(br, false);
0909e117
HX		 2090 br->multicast_router = val;
2091 err = 0;
2092 break;
0909e117
HX		 2093 }
2094
0909e117
HX		 2095 spin_unlock_bh(&br->multicast_lock);
2096
2097 return err;
2098}
2099
7f0aec7a
NA		 2100static void __del_port_router(struct net_bridge_port *p)
2101{
2102 if (hlist_unhashed(&p->rlist))
2103 return;
2104 hlist_del_init_rcu(&p->rlist);
2105 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
6d549648 2106 br_port_mc_router_state_change(p, false);
f12e7d95
NF		 2107
2108 /* don't allow timer refresh */
2109 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2110 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
7f0aec7a
NA		 2111}
2112
0909e117
HX		 2113int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
2114{
2115 struct net_bridge *br = p->br;
a55d8246 2116 unsigned long now = jiffies;
6ae4ae8e 2117 int err = -EINVAL;
0909e117
HX		 2118
2119 spin_lock(&br->multicast_lock);
4950cfd1 2120 if (p->multicast_router == val) {
a55d8246
NA		 2121 /* Refresh the temp router port timer */
2122 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2123 mod_timer(&p->multicast_router_timer,
2124 now + br->multicast_querier_interval);
4950cfd1
NA		 2125 err = 0;
2126 goto unlock;
2127 }
0909e117 2128 switch (val) {
7f0aec7a
NA		 2129 case MDB_RTR_TYPE_DISABLED:
2130 p->multicast_router = MDB_RTR_TYPE_DISABLED;
2131 __del_port_router(p);
2132 del_timer(&p->multicast_router_timer);
2133 break;
2134 case MDB_RTR_TYPE_TEMP_QUERY:
2135 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2136 __del_port_router(p);
2137 break;
2138 case MDB_RTR_TYPE_PERM:
2139 p->multicast_router = MDB_RTR_TYPE_PERM;
0909e117 2140 del_timer(&p->multicast_router_timer);
0909e117
HX		 2141 br_multicast_add_router(br, p);
2142 break;
a55d8246
NA		 2143 case MDB_RTR_TYPE_TEMP:
2144 p->multicast_router = MDB_RTR_TYPE_TEMP;
2145 br_multicast_mark_router(br, p);
2146 break;
7f0aec7a
NA		 2147 default:
2148 goto unlock;
0909e117 2149 }
7f0aec7a
NA		 2150 err = 0;
2151unlock:
0909e117
HX		 2152 spin_unlock(&br->multicast_lock);
2153
2154 return err;
2155}
561f1103 2156
cc0fdd80 2157static void br_multicast_start_querier(struct net_bridge *br,
90010b36 2158 struct bridge_mcast_own_query *query)
561f1103
HX		 2159{
2160 struct net_bridge_port *port;
74857216 2161
cc0fdd80 2162 __br_multicast_open(br, query);
74857216 2163
99eb4c16
NA		 2164 rcu_read_lock();
2165 list_for_each_entry_rcu(port, &br->port_list, list) {
74857216
HX		 2166 if (port->state == BR_STATE_DISABLED ||
2167 port->state == BR_STATE_BLOCKING)
2168 continue;
2169
90010b36
LL		 2170 if (query == &br->ip4_own_query)
2171 br_multicast_enable(&port->ip4_own_query);
cc0fdd80
LL		 2172#if IS_ENABLED(CONFIG_IPV6)
2173 else
90010b36 2174 br_multicast_enable(&port->ip6_own_query);
cc0fdd80 2175#endif
74857216 2176 }
99eb4c16 2177 rcu_read_unlock();
74857216
HX		 2178}
2179
2180int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2181{
e8051688 2182 struct net_bridge_mdb_htable *mdb;
7cb3f921
NA		 2183 struct net_bridge_port *port;
2184 int err = 0;
561f1103 2185
ef5e0d82 2186 spin_lock_bh(&br->multicast_lock);
561f1103
HX		 2187 if (br->multicast_disabled == !val)
2188 goto unlock;
2189
147c1e9b 2190 br_mc_disabled_update(br->dev, !val);
561f1103
HX		 2191 br->multicast_disabled = !val;
2192 if (br->multicast_disabled)
2193 goto unlock;
2194
3a7fda06
HX		 2195 if (!netif_running(br->dev))
2196 goto unlock;
2197
e8051688
ED		 2198 mdb = mlock_dereference(br->mdb, br);
2199 if (mdb) {
2200 if (mdb->old) {
561f1103
HX		 2201 err = -EEXIST;
2202rollback:
2203 br->multicast_disabled = !!val;
2204 goto unlock;
2205 }
2206
e8051688 2207 err = br_mdb_rehash(&br->mdb, mdb->max,
561f1103
HX		 2208 br->hash_elasticity);
2209 if (err)
2210 goto rollback;
2211 }
2212
7cb3f921
NA		 2213 br_multicast_open(br);
2214 list_for_each_entry(port, &br->port_list, list)
2215 __br_multicast_enable_port(port);
561f1103
HX		 2216
2217unlock:
ef5e0d82 2218 spin_unlock_bh(&br->multicast_lock);
561f1103
HX		 2219
2220 return err;
2221}
b195167f 2222
9341b988
IS		 2223bool br_multicast_enabled(const struct net_device *dev)
2224{
2225 struct net_bridge *br = netdev_priv(dev);
2226
2227 return !br->multicast_disabled;
2228}
2229EXPORT_SYMBOL_GPL(br_multicast_enabled);
2230
0912bda4
YG		 2231bool br_multicast_router(const struct net_device *dev)
2232{
2233 struct net_bridge *br = netdev_priv(dev);
2234 bool is_router;
2235
2236 spin_lock_bh(&br->multicast_lock);
2237 is_router = br_multicast_is_router(br);
2238 spin_unlock_bh(&br->multicast_lock);
2239 return is_router;
2240}
2241EXPORT_SYMBOL_GPL(br_multicast_router);
2242
c5c23260
HX		 2243int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2244{
b00589af
LL		 2245 unsigned long max_delay;
2246
c5c23260
HX		 2247 val = !!val;
2248
2249 spin_lock_bh(&br->multicast_lock);
2250 if (br->multicast_querier == val)
2251 goto unlock;
2252
2253 br->multicast_querier = val;
b00589af
LL		 2254 if (!val)
2255 goto unlock;
2256
2257 max_delay = br->multicast_query_response_interval;
b00589af 2258
90010b36
LL		 2259 if (!timer_pending(&br->ip4_other_query.timer))
2260 br->ip4_other_query.delay_time = jiffies + max_delay;
cc0fdd80 2261
90010b36 2262 br_multicast_start_querier(br, &br->ip4_own_query);
cc0fdd80
LL		 2263
2264#if IS_ENABLED(CONFIG_IPV6)
90010b36
LL		 2265 if (!timer_pending(&br->ip6_other_query.timer))
2266 br->ip6_other_query.delay_time = jiffies + max_delay;
cc0fdd80 2267
90010b36 2268 br_multicast_start_querier(br, &br->ip6_own_query);
cc0fdd80 2269#endif
c5c23260
HX		 2270
2271unlock:
2272 spin_unlock_bh(&br->multicast_lock);
2273
2274 return 0;
2275}
2276
b195167f
HX		 2277int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2278{
6ae4ae8e 2279 int err = -EINVAL;
b195167f 2280 u32 old;
e8051688 2281 struct net_bridge_mdb_htable *mdb;
b195167f 2282
fe0d692b 2283 spin_lock_bh(&br->multicast_lock);
b195167f
HX		 2284 if (!is_power_of_2(val))
2285 goto unlock;
e8051688
ED		 2286
2287 mdb = mlock_dereference(br->mdb, br);
2288 if (mdb && val < mdb->size)
b195167f
HX		 2289 goto unlock;
2290
2291 err = 0;
2292
2293 old = br->hash_max;
2294 br->hash_max = val;
2295
e8051688
ED		 2296 if (mdb) {
2297 if (mdb->old) {
b195167f
HX		 2298 err = -EEXIST;
2299rollback:
2300 br->hash_max = old;
2301 goto unlock;
2302 }
2303
2304 err = br_mdb_rehash(&br->mdb, br->hash_max,
2305 br->hash_elasticity);
2306 if (err)
2307 goto rollback;
2308 }
2309
2310unlock:
fe0d692b 2311 spin_unlock_bh(&br->multicast_lock);
b195167f
HX		 2312
2313 return err;
2314}
07f8ac4a 2315
5e923585
NA		 2316int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2317{
2318 /* Currently we support only version 2 and 3 */
2319 switch (val) {
2320 case 2:
2321 case 3:
2322 break;
2323 default:
2324 return -EINVAL;
2325 }
2326
2327 spin_lock_bh(&br->multicast_lock);
2328 br->multicast_igmp_version = val;
2329 spin_unlock_bh(&br->multicast_lock);
2330
2331 return 0;
2332}
2333
aa2ae3e7
NA		 2334#if IS_ENABLED(CONFIG_IPV6)
2335int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2336{
2337 /* Currently we support version 1 and 2 */
2338 switch (val) {
2339 case 1:
2340 case 2:
2341 break;
2342 default:
2343 return -EINVAL;
2344 }
2345
2346 spin_lock_bh(&br->multicast_lock);
2347 br->multicast_mld_version = val;
2348 spin_unlock_bh(&br->multicast_lock);
2349
2350 return 0;
2351}
2352#endif
2353
07f8ac4a
LL		 2354/**
2355 * br_multicast_list_adjacent - Returns snooped multicast addresses
2356 * @dev: The bridge port adjacent to which to retrieve addresses
2357 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2358 *
2359 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2360 * snooping feature on all bridge ports of dev's bridge device, excluding
2361 * the addresses from dev itself.
2362 *
2363 * Returns the number of items added to br_ip_list.
2364 *
2365 * Notes:
2366 * - br_ip_list needs to be initialized by caller
2367 * - br_ip_list might contain duplicates in the end
2368 * (needs to be taken care of by caller)
2369 * - br_ip_list needs to be freed by caller
2370 */
2371int br_multicast_list_adjacent(struct net_device *dev,
2372 struct list_head *br_ip_list)
2373{
2374 struct net_bridge *br;
2375 struct net_bridge_port *port;
2376 struct net_bridge_port_group *group;
2377 struct br_ip_list *entry;
2378 int count = 0;
2379
2380 rcu_read_lock();
2381 if (!br_ip_list || !br_port_exists(dev))
2382 goto unlock;
2383
2384 port = br_port_get_rcu(dev);
2385 if (!port || !port->br)
2386 goto unlock;
2387
2388 br = port->br;
2389
2390 list_for_each_entry_rcu(port, &br->port_list, list) {
2391 if (!port->dev || port->dev == dev)
2392 continue;
2393
2394 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2395 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2396 if (!entry)
2397 goto unlock;
2398
2399 entry->addr = group->addr;
2400 list_add(&entry->list, br_ip_list);
2401 count++;
2402 }
2403 }
2404
2405unlock:
2406 rcu_read_unlock();
2407 return count;
2408}
2409EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2cd41431 2410
c34963e2
LL		 2411/**
2412 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2413 * @dev: The bridge port providing the bridge on which to check for a querier
2414 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2415 *
2416 * Checks whether the given interface has a bridge on top and if so returns
2417 * true if a valid querier exists anywhere on the bridged link layer.
2418 * Otherwise returns false.
2419 */
2420bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2421{
2422 struct net_bridge *br;
2423 struct net_bridge_port *port;
2424 struct ethhdr eth;
2425 bool ret = false;
2426
2427 rcu_read_lock();
2428 if (!br_port_exists(dev))
2429 goto unlock;
2430
2431 port = br_port_get_rcu(dev);
2432 if (!port || !port->br)
2433 goto unlock;
2434
2435 br = port->br;
2436
2437 memset(&eth, 0, sizeof(eth));
2438 eth.h_proto = htons(proto);
2439
2440 ret = br_multicast_querier_exists(br, &eth);
2441
2442unlock:
2443 rcu_read_unlock();
2444 return ret;
2445}
2446EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2447
2cd41431
LL		 2448/**
2449 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2450 * @dev: The bridge port adjacent to which to check for a querier
2451 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2452 *
2453 * Checks whether the given interface has a bridge on top and if so returns
2454 * true if a selected querier is behind one of the other ports of this
2455 * bridge. Otherwise returns false.
2456 */
2457bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2458{
2459 struct net_bridge *br;
2460 struct net_bridge_port *port;
2461 bool ret = false;
2462
2463 rcu_read_lock();
2464 if (!br_port_exists(dev))
2465 goto unlock;
2466
2467 port = br_port_get_rcu(dev);
2468 if (!port || !port->br)
2469 goto unlock;
2470
2471 br = port->br;
2472
2473 switch (proto) {
2474 case ETH_P_IP:
2475 if (!timer_pending(&br->ip4_other_query.timer) ||
2476 rcu_dereference(br->ip4_querier.port) == port)
2477 goto unlock;
2478 break;
3993c4e1 2479#if IS_ENABLED(CONFIG_IPV6)
2cd41431
LL		 2480 case ETH_P_IPV6:
2481 if (!timer_pending(&br->ip6_other_query.timer) ||
2482 rcu_dereference(br->ip6_querier.port) == port)
2483 goto unlock;
2484 break;
3993c4e1 2485#endif
2cd41431
LL		 2486 default:
2487 goto unlock;
2488 }
2489
2490 ret = true;
2491unlock:
2492 rcu_read_unlock();
2493 return ret;
2494}
2495EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
1080ab95
NA		 2496
2497static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
a65056ec 2498 const struct sk_buff *skb, u8 type, u8 dir)
1080ab95
NA		 2499{
2500 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
a65056ec
NA		 2501 __be16 proto = skb->protocol;
2502 unsigned int t_len;
1080ab95
NA		 2503
2504 u64_stats_update_begin(&pstats->syncp);
2505 switch (proto) {
2506 case htons(ETH_P_IP):
a65056ec 2507 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
1080ab95
NA		 2508 switch (type) {
2509 case IGMP_HOST_MEMBERSHIP_REPORT:
2510 pstats->mstats.igmp_v1reports[dir]++;
2511 break;
2512 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2513 pstats->mstats.igmp_v2reports[dir]++;
2514 break;
2515 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2516 pstats->mstats.igmp_v3reports[dir]++;
2517 break;
2518 case IGMP_HOST_MEMBERSHIP_QUERY:
a65056ec
NA		 2519 if (t_len != sizeof(struct igmphdr)) {
2520 pstats->mstats.igmp_v3queries[dir]++;
2521 } else {
2522 unsigned int offset = skb_transport_offset(skb);
2523 struct igmphdr *ih, _ihdr;
2524
2525 ih = skb_header_pointer(skb, offset,
2526 sizeof(_ihdr), &_ihdr);
2527 if (!ih)
2528 break;
2529 if (!ih->code)
2530 pstats->mstats.igmp_v1queries[dir]++;
2531 else
2532 pstats->mstats.igmp_v2queries[dir]++;
2533 }
1080ab95
NA		 2534 break;
2535 case IGMP_HOST_LEAVE_MESSAGE:
2536 pstats->mstats.igmp_leaves[dir]++;
2537 break;
2538 }
2539 break;
2540#if IS_ENABLED(CONFIG_IPV6)
2541 case htons(ETH_P_IPV6):
a65056ec
NA		 2542 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2543 sizeof(struct ipv6hdr);
2544 t_len -= skb_network_header_len(skb);
1080ab95
NA		 2545 switch (type) {
2546 case ICMPV6_MGM_REPORT:
2547 pstats->mstats.mld_v1reports[dir]++;
2548 break;
2549 case ICMPV6_MLD2_REPORT:
2550 pstats->mstats.mld_v2reports[dir]++;
2551 break;
2552 case ICMPV6_MGM_QUERY:
a65056ec
NA		 2553 if (t_len != sizeof(struct mld_msg))
2554 pstats->mstats.mld_v2queries[dir]++;
2555 else
2556 pstats->mstats.mld_v1queries[dir]++;
1080ab95
NA		 2557 break;
2558 case ICMPV6_MGM_REDUCTION:
2559 pstats->mstats.mld_leaves[dir]++;
2560 break;
2561 }
2562 break;
2563#endif /* CONFIG_IPV6 */
2564 }
2565 u64_stats_update_end(&pstats->syncp);
2566}
2567
2568void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
a65056ec 2569 const struct sk_buff *skb, u8 type, u8 dir)
1080ab95
NA		 2570{
2571 struct bridge_mcast_stats __percpu *stats;
2572
2573 /* if multicast_disabled is true then igmp type can't be set */
2574 if (!type || !br->multicast_stats_enabled)
2575 return;
2576
2577 if (p)
2578 stats = p->mcast_stats;
2579 else
2580 stats = br->mcast_stats;
2581 if (WARN_ON(!stats))
2582 return;
2583
a65056ec 2584 br_mcast_stats_add(stats, skb, type, dir);
1080ab95
NA		 2585}
2586
2587int br_multicast_init_stats(struct net_bridge *br)
2588{
2589 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2590 if (!br->mcast_stats)
2591 return -ENOMEM;
2592
2593 return 0;
2594}
2595
b6fe0440
IS		 2596void br_multicast_uninit_stats(struct net_bridge *br)
2597{
2598 free_percpu(br->mcast_stats);
2599}
2600
1080ab95
NA		 2601static void mcast_stats_add_dir(u64 *dst, u64 *src)
2602{
2603 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2604 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2605}
2606
2607void br_multicast_get_stats(const struct net_bridge *br,
2608 const struct net_bridge_port *p,
2609 struct br_mcast_stats *dest)
2610{
2611 struct bridge_mcast_stats __percpu *stats;
2612 struct br_mcast_stats tdst;
2613 int i;
2614
2615 memset(dest, 0, sizeof(*dest));
2616 if (p)
2617 stats = p->mcast_stats;
2618 else
2619 stats = br->mcast_stats;
2620 if (WARN_ON(!stats))
2621 return;
2622
2623 memset(&tdst, 0, sizeof(tdst));
2624 for_each_possible_cpu(i) {
2625 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2626 struct br_mcast_stats temp;
2627 unsigned int start;
2628
2629 do {
2630 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2631 memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2632 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2633
a65056ec
NA		 2634 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2635 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2636 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
1080ab95
NA		 2637 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2638 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2639 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2640 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2641 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2642
a65056ec
NA		 2643 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2644 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
1080ab95
NA		 2645 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2646 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2647 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2648 tdst.mld_parse_errors += temp.mld_parse_errors;
2649 }
2650 memcpy(dest, &tdst, sizeof(*dest));
2651}
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