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switchdev: bridge: Offload multicast disabled
[thirdparty/kernel/stable.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
bc8c20ac
SA		 50#if IS_ENABLED(CONFIG_IPV6)
51static void br_ip6_multicast_leave_group(struct net_bridge *br,
52 struct net_bridge_port *port,
53 const struct in6_addr *group,
6db6f0ea 54 __u16 vid, const unsigned char *src);
bc8c20ac 55#endif
2ce297fc 56unsigned int br_mdb_rehash_seq;
c83b8fab 57
8ef2a9a5
YH		 58static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
59{
60 if (a->proto != b->proto)
61 return 0;
b0e9a30d
VY		 62 if (a->vid != b->vid)
63 return 0;
8ef2a9a5
YH		 64 switch (a->proto) {
65 case htons(ETH_P_IP):
66 return a->u.ip4 == b->u.ip4;
dfd56b8b 67#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 68 case htons(ETH_P_IPV6):
69 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
70#endif
8ef2a9a5
YH		 71 }
72 return 0;
73}
74
b0e9a30d
VY		 75static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
76 __u16 vid)
eb1d1641 77{
b0e9a30d 78 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
eb1d1641
HX		 79}
80
dfd56b8b 81#if IS_ENABLED(CONFIG_IPV6)
08b202b6 82static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
b0e9a30d
VY		 83 const struct in6_addr *ip,
84 __u16 vid)
08b202b6 85{
b0e9a30d
VY		 86 return jhash_2words(ipv6_addr_hash(ip), vid,
87 mdb->secret) & (mdb->max - 1);
08b202b6
YH		 88}
89#endif
90
8ef2a9a5
YH		 91static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
92 struct br_ip *ip)
93{
94 switch (ip->proto) {
95 case htons(ETH_P_IP):
b0e9a30d 96 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
dfd56b8b 97#if IS_ENABLED(CONFIG_IPV6)
08b202b6 98 case htons(ETH_P_IPV6):
b0e9a30d 99 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
08b202b6 100#endif
8ef2a9a5
YH		 101 }
102 return 0;
eb1d1641
HX		 103}
104
105static struct net_bridge_mdb_entry *__br_mdb_ip_get(
8ef2a9a5 106 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
eb1d1641
HX		 107{
108 struct net_bridge_mdb_entry *mp;
eb1d1641 109
b67bfe0d 110 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
8ef2a9a5 111 if (br_ip_equal(&mp->addr, dst))
eb1d1641
HX		 112 return mp;
113 }
114
115 return NULL;
116}
117
cfd56754
CW		 118struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
119 struct br_ip *dst)
7f285fa7
HX		 120{
121 if (!mdb)
122 return NULL;
123
124 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
125}
126
8ef2a9a5 127static struct net_bridge_mdb_entry *br_mdb_ip4_get(
b0e9a30d 128 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
eb1d1641 129{
8ef2a9a5
YH		 130 struct br_ip br_dst;
131
132 br_dst.u.ip4 = dst;
133 br_dst.proto = htons(ETH_P_IP);
b0e9a30d 134 br_dst.vid = vid;
0821ec55 135
7f285fa7 136 return br_mdb_ip_get(mdb, &br_dst);
8ef2a9a5
YH		 137}
138
dfd56b8b 139#if IS_ENABLED(CONFIG_IPV6)
08b202b6 140static struct net_bridge_mdb_entry *br_mdb_ip6_get(
b0e9a30d
VY		 141 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
142 __u16 vid)
08b202b6
YH		 143{
144 struct br_ip br_dst;
0821ec55 145
4e3fd7a0 146 br_dst.u.ip6 = *dst;
08b202b6 147 br_dst.proto = htons(ETH_P_IPV6);
b0e9a30d 148 br_dst.vid = vid;
08b202b6 149
7f285fa7 150 return br_mdb_ip_get(mdb, &br_dst);
08b202b6
YH		 151}
152#endif
153
eb1d1641 154struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
fbca58a2 155 struct sk_buff *skb, u16 vid)
eb1d1641 156{
e8051688 157 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
8ef2a9a5
YH		 158 struct br_ip ip;
159
7f285fa7 160 if (br->multicast_disabled)
eb1d1641
HX		 161 return NULL;
162
8ef2a9a5 163 if (BR_INPUT_SKB_CB(skb)->igmp)
eb1d1641
HX		 164 return NULL;
165
8ef2a9a5 166 ip.proto = skb->protocol;
fbca58a2 167 ip.vid = vid;
8ef2a9a5 168
eb1d1641
HX		 169 switch (skb->protocol) {
170 case htons(ETH_P_IP):
8ef2a9a5
YH		 171 ip.u.ip4 = ip_hdr(skb)->daddr;
172 break;
dfd56b8b 173#if IS_ENABLED(CONFIG_IPV6)
08b202b6 174 case htons(ETH_P_IPV6):
4e3fd7a0 175 ip.u.ip6 = ipv6_hdr(skb)->daddr;
08b202b6
YH		 176 break;
177#endif
8ef2a9a5
YH		 178 default:
179 return NULL;
eb1d1641
HX		 180 }
181
8ef2a9a5 182 return br_mdb_ip_get(mdb, &ip);
eb1d1641
HX		 183}
184
185static void br_mdb_free(struct rcu_head *head)
186{
187 struct net_bridge_mdb_htable *mdb =
188 container_of(head, struct net_bridge_mdb_htable, rcu);
189 struct net_bridge_mdb_htable *old = mdb->old;
190
191 mdb->old = NULL;
192 kfree(old->mhash);
193 kfree(old);
194}
195
196static int br_mdb_copy(struct net_bridge_mdb_htable *new,
197 struct net_bridge_mdb_htable *old,
198 int elasticity)
199{
200 struct net_bridge_mdb_entry *mp;
eb1d1641
HX		 201 int maxlen;
202 int len;
203 int i;
204
205 for (i = 0; i < old->max; i++)
b67bfe0d 206 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
eb1d1641 207 hlist_add_head(&mp->hlist[new->ver],
8ef2a9a5 208 &new->mhash[br_ip_hash(new, &mp->addr)]);
eb1d1641
HX		 209
210 if (!elasticity)
211 return 0;
212
213 maxlen = 0;
214 for (i = 0; i < new->max; i++) {
215 len = 0;
b67bfe0d 216 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
eb1d1641
HX		 217 len++;
218 if (len > maxlen)
219 maxlen = len;
220 }
221
222 return maxlen > elasticity ? -EINVAL : 0;
223}
224
cfd56754 225void br_multicast_free_pg(struct rcu_head *head)
eb1d1641
HX		 226{
227 struct net_bridge_port_group *p =
228 container_of(head, struct net_bridge_port_group, rcu);
229
230 kfree(p);
231}
232
233static void br_multicast_free_group(struct rcu_head *head)
234{
235 struct net_bridge_mdb_entry *mp =
236 container_of(head, struct net_bridge_mdb_entry, rcu);
237
238 kfree(mp);
239}
240
241static void br_multicast_group_expired(unsigned long data)
242{
243 struct net_bridge_mdb_entry *mp = (void *)data;
244 struct net_bridge *br = mp->br;
245 struct net_bridge_mdb_htable *mdb;
246
247 spin_lock(&br->multicast_lock);
248 if (!netif_running(br->dev) || timer_pending(&mp->timer))
249 goto out;
250
8a870178 251 mp->mglist = false;
eb1d1641
HX		 252
253 if (mp->ports)
254 goto out;
255
e8051688
ED		 256 mdb = mlock_dereference(br->mdb, br);
257
eb1d1641
HX		 258 hlist_del_rcu(&mp->hlist[mdb->ver]);
259 mdb->size--;
260
eb1d1641
HX		 261 call_rcu_bh(&mp->rcu, br_multicast_free_group);
262
263out:
264 spin_unlock(&br->multicast_lock);
265}
266
267static void br_multicast_del_pg(struct net_bridge *br,
268 struct net_bridge_port_group *pg)
269{
e8051688 270 struct net_bridge_mdb_htable *mdb;
eb1d1641
HX		 271 struct net_bridge_mdb_entry *mp;
272 struct net_bridge_port_group *p;
e8051688
ED		 273 struct net_bridge_port_group __rcu **pp;
274
275 mdb = mlock_dereference(br->mdb, br);
eb1d1641 276
8ef2a9a5 277 mp = br_mdb_ip_get(mdb, &pg->addr);
eb1d1641
HX		 278 if (WARN_ON(!mp))
279 return;
280
e8051688
ED		 281 for (pp = &mp->ports;
282 (p = mlock_dereference(*pp, br)) != NULL;
283 pp = &p->next) {
eb1d1641
HX		 284 if (p != pg)
285 continue;
286
83f6a740 287 rcu_assign_pointer(*pp, p->next);
eb1d1641
HX		 288 hlist_del_init(&p->mglist);
289 del_timer(&p->timer);
45ebcce5
ER		 290 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
291 p->flags);
eb1d1641
HX		 292 call_rcu_bh(&p->rcu, br_multicast_free_pg);
293
454594f3 294 if (!mp->ports && !mp->mglist &&
eb1d1641
HX		 295 netif_running(br->dev))
296 mod_timer(&mp->timer, jiffies);
297
298 return;
299 }
300
301 WARN_ON(1);
302}
303
304static void br_multicast_port_group_expired(unsigned long data)
305{
306 struct net_bridge_port_group *pg = (void *)data;
307 struct net_bridge *br = pg->port->br;
308
309 spin_lock(&br->multicast_lock);
310 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
9d06b6d8 311 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
eb1d1641
HX		 312 goto out;
313
314 br_multicast_del_pg(br, pg);
315
316out:
317 spin_unlock(&br->multicast_lock);
318}
319
e8051688 320static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
eb1d1641
HX		 321 int elasticity)
322{
e8051688 323 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
eb1d1641
HX		 324 struct net_bridge_mdb_htable *mdb;
325 int err;
326
327 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
328 if (!mdb)
329 return -ENOMEM;
330
331 mdb->max = max;
332 mdb->old = old;
333
334 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
335 if (!mdb->mhash) {
336 kfree(mdb);
337 return -ENOMEM;
338 }
339
340 mdb->size = old ? old->size : 0;
341 mdb->ver = old ? old->ver ^ 1 : 0;
342
343 if (!old || elasticity)
344 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
345 else
346 mdb->secret = old->secret;
347
348 if (!old)
349 goto out;
350
351 err = br_mdb_copy(mdb, old, elasticity);
352 if (err) {
353 kfree(mdb->mhash);
354 kfree(mdb);
355 return err;
356 }
357
2ce297fc 358 br_mdb_rehash_seq++;
eb1d1641
HX		 359 call_rcu_bh(&mdb->rcu, br_mdb_free);
360
361out:
362 rcu_assign_pointer(*mdbp, mdb);
363
364 return 0;
365}
366
8ef2a9a5 367static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
1080ab95
NA		 368 __be32 group,
369 u8 *igmp_type)
eb1d1641 370{
5e923585
NA		 371 struct igmpv3_query *ihv3;
372 size_t igmp_hdr_size;
eb1d1641
HX		 373 struct sk_buff *skb;
374 struct igmphdr *ih;
375 struct ethhdr *eth;
376 struct iphdr *iph;
377
5e923585
NA		 378 igmp_hdr_size = sizeof(*ih);
379 if (br->multicast_igmp_version == 3)
380 igmp_hdr_size = sizeof(*ihv3);
eb1d1641 381 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
5e923585 382 igmp_hdr_size + 4);
eb1d1641
HX		 383 if (!skb)
384 goto out;
385
386 skb->protocol = htons(ETH_P_IP);
387
388 skb_reset_mac_header(skb);
389 eth = eth_hdr(skb);
390
e5a727f6 391 ether_addr_copy(eth->h_source, br->dev->dev_addr);
eb1d1641
HX		 392 eth->h_dest[0] = 1;
393 eth->h_dest[1] = 0;
394 eth->h_dest[2] = 0x5e;
395 eth->h_dest[3] = 0;
396 eth->h_dest[4] = 0;
397 eth->h_dest[5] = 1;
398 eth->h_proto = htons(ETH_P_IP);
399 skb_put(skb, sizeof(*eth));
400
401 skb_set_network_header(skb, skb->len);
402 iph = ip_hdr(skb);
403
404 iph->version = 4;
405 iph->ihl = 6;
406 iph->tos = 0xc0;
5e923585 407 iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4);
eb1d1641
HX		 408 iph->id = 0;
409 iph->frag_off = htons(IP_DF);
410 iph->ttl = 1;
411 iph->protocol = IPPROTO_IGMP;
1c8ad5bf
CW		 412 iph->saddr = br->multicast_query_use_ifaddr ?
413 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
eb1d1641
HX		 414 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
415 ((u8 *)&iph[1])[0] = IPOPT_RA;
416 ((u8 *)&iph[1])[1] = 4;
417 ((u8 *)&iph[1])[2] = 0;
418 ((u8 *)&iph[1])[3] = 0;
419 ip_send_check(iph);
420 skb_put(skb, 24);
421
422 skb_set_transport_header(skb, skb->len);
1080ab95 423 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
eb1d1641 424
5e923585
NA		 425 switch (br->multicast_igmp_version) {
426 case 2:
427 ih = igmp_hdr(skb);
428 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
429 ih->code = (group ? br->multicast_last_member_interval :
430 br->multicast_query_response_interval) /
431 (HZ / IGMP_TIMER_SCALE);
432 ih->group = group;
433 ih->csum = 0;
434 ih->csum = ip_compute_csum((void *)ih, sizeof(*ih));
435 break;
436 case 3:
437 ihv3 = igmpv3_query_hdr(skb);
438 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
439 ihv3->code = (group ? br->multicast_last_member_interval :
440 br->multicast_query_response_interval) /
441 (HZ / IGMP_TIMER_SCALE);
442 ihv3->group = group;
443 ihv3->qqic = br->multicast_query_interval / HZ;
444 ihv3->nsrcs = 0;
445 ihv3->resv = 0;
446 ihv3->suppress = 0;
447 ihv3->qrv = 2;
448 ihv3->csum = 0;
449 ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3));
450 break;
451 }
452
453 skb_put(skb, igmp_hdr_size);
eb1d1641
HX		 454 __skb_pull(skb, sizeof(*eth));
455
456out:
457 return skb;
458}
459
dfd56b8b 460#if IS_ENABLED(CONFIG_IPV6)
08b202b6 461static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
1080ab95
NA		 462 const struct in6_addr *grp,
463 u8 *igmp_type)
08b202b6 464{
aa2ae3e7
NA		 465 struct mld2_query *mld2q;
466 unsigned long interval;
08b202b6
YH		 467 struct ipv6hdr *ip6h;
468 struct mld_msg *mldq;
aa2ae3e7
NA		 469 size_t mld_hdr_size;
470 struct sk_buff *skb;
08b202b6
YH		 471 struct ethhdr *eth;
472 u8 *hopopt;
08b202b6 473
aa2ae3e7
NA		 474 mld_hdr_size = sizeof(*mldq);
475 if (br->multicast_mld_version == 2)
476 mld_hdr_size = sizeof(*mld2q);
08b202b6 477 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
aa2ae3e7 478 8 + mld_hdr_size);
08b202b6
YH		 479 if (!skb)
480 goto out;
481
482 skb->protocol = htons(ETH_P_IPV6);
483
484 /* Ethernet header */
485 skb_reset_mac_header(skb);
486 eth = eth_hdr(skb);
487
e5a727f6 488 ether_addr_copy(eth->h_source, br->dev->dev_addr);
08b202b6
YH		 489 eth->h_proto = htons(ETH_P_IPV6);
490 skb_put(skb, sizeof(*eth));
491
492 /* IPv6 header + HbH option */
493 skb_set_network_header(skb, skb->len);
494 ip6h = ipv6_hdr(skb);
495
496 *(__force __be32 *)ip6h = htonl(0x60000000);
aa2ae3e7 497 ip6h->payload_len = htons(8 + mld_hdr_size);
08b202b6
YH		 498 ip6h->nexthdr = IPPROTO_HOPOPTS;
499 ip6h->hop_limit = 1;
a7bff75b 500 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
d1d81d4c
UW		 501 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
502 &ip6h->saddr)) {
503 kfree_skb(skb);
0888d5f3 504 br->has_ipv6_addr = 0;
d1d81d4c
UW		 505 return NULL;
506 }
0888d5f3 507
508 br->has_ipv6_addr = 1;
36cff5a1 509 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
08b202b6
YH		 510
511 hopopt = (u8 *)(ip6h + 1);
512 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
513 hopopt[1] = 0; /* length of HbH */
514 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
515 hopopt[3] = 2; /* Length of RA Option */
516 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
517 hopopt[5] = 0;
1de5a71c
EZ		 518 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
519 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
08b202b6
YH		 520
521 skb_put(skb, sizeof(*ip6h) + 8);
522
523 /* ICMPv6 */
524 skb_set_transport_header(skb, skb->len);
1080ab95 525 interval = ipv6_addr_any(grp) ?
32de868c
LL		 526 br->multicast_query_response_interval :
527 br->multicast_last_member_interval;
1080ab95 528 *igmp_type = ICMPV6_MGM_QUERY;
aa2ae3e7
NA		 529 switch (br->multicast_mld_version) {
530 case 1:
531 mldq = (struct mld_msg *)icmp6_hdr(skb);
532 mldq->mld_type = ICMPV6_MGM_QUERY;
533 mldq->mld_code = 0;
534 mldq->mld_cksum = 0;
535 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
536 mldq->mld_reserved = 0;
537 mldq->mld_mca = *grp;
538 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
539 sizeof(*mldq), IPPROTO_ICMPV6,
540 csum_partial(mldq,
541 sizeof(*mldq),
542 0));
543 break;
544 case 2:
545 mld2q = (struct mld2_query *)icmp6_hdr(skb);
53631a5f 546 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
aa2ae3e7
NA		 547 mld2q->mld2q_type = ICMPV6_MGM_QUERY;
548 mld2q->mld2q_code = 0;
549 mld2q->mld2q_cksum = 0;
550 mld2q->mld2q_resv1 = 0;
551 mld2q->mld2q_resv2 = 0;
552 mld2q->mld2q_suppress = 0;
553 mld2q->mld2q_qrv = 2;
554 mld2q->mld2q_nsrcs = 0;
555 mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
556 mld2q->mld2q_mca = *grp;
557 mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
558 sizeof(*mld2q),
559 IPPROTO_ICMPV6,
560 csum_partial(mld2q,
561 sizeof(*mld2q),
562 0));
563 break;
564 }
565 skb_put(skb, mld_hdr_size);
08b202b6
YH		 566
567 __skb_pull(skb, sizeof(*eth));
568
569out:
570 return skb;
571}
572#endif
573
8ef2a9a5 574static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
1080ab95
NA		 575 struct br_ip *addr,
576 u8 *igmp_type)
8ef2a9a5
YH		 577{
578 switch (addr->proto) {
579 case htons(ETH_P_IP):
1080ab95 580 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
dfd56b8b 581#if IS_ENABLED(CONFIG_IPV6)
08b202b6 582 case htons(ETH_P_IPV6):
1080ab95
NA		 583 return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
584 igmp_type);
08b202b6 585#endif
8ef2a9a5
YH		 586 }
587 return NULL;
588}
589
eb1d1641 590static struct net_bridge_mdb_entry *br_multicast_get_group(
8ef2a9a5
YH		 591 struct net_bridge *br, struct net_bridge_port *port,
592 struct br_ip *group, int hash)
eb1d1641 593{
e8051688 594 struct net_bridge_mdb_htable *mdb;
eb1d1641 595 struct net_bridge_mdb_entry *mp;
95c96174
ED		 596 unsigned int count = 0;
597 unsigned int max;
eb1d1641
HX		 598 int elasticity;
599 int err;
600
e8051688 601 mdb = rcu_dereference_protected(br->mdb, 1);
b67bfe0d 602 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
eb1d1641 603 count++;
8ef2a9a5 604 if (unlikely(br_ip_equal(group, &mp->addr)))
eb1d1641 605 return mp;
eb1d1641
HX		 606 }
607
608 elasticity = 0;
609 max = mdb->max;
610
611 if (unlikely(count > br->hash_elasticity && count)) {
612 if (net_ratelimit())
28a16c97 613 br_info(br, "Multicast hash table "
614 "chain limit reached: %s\n",
615 port ? port->dev->name : br->dev->name);
eb1d1641
HX		 616
617 elasticity = br->hash_elasticity;
618 }
619
620 if (mdb->size >= max) {
621 max *= 2;
036be6db
TG		 622 if (unlikely(max > br->hash_max)) {
623 br_warn(br, "Multicast hash table maximum of %d "
624 "reached, disabling snooping: %s\n",
625 br->hash_max,
626 port ? port->dev->name : br->dev->name);
eb1d1641
HX		 627 err = -E2BIG;
628disable:
629 br->multicast_disabled = 1;
630 goto err;
631 }
632 }
633
634 if (max > mdb->max || elasticity) {
635 if (mdb->old) {
636 if (net_ratelimit())
28a16c97 637 br_info(br, "Multicast hash table "
638 "on fire: %s\n",
639 port ? port->dev->name : br->dev->name);
eb1d1641
HX		 640 err = -EEXIST;
641 goto err;
642 }
643
644 err = br_mdb_rehash(&br->mdb, max, elasticity);
645 if (err) {
28a16c97 646 br_warn(br, "Cannot rehash multicast "
647 "hash table, disabling snooping: %s, %d, %d\n",
648 port ? port->dev->name : br->dev->name,
649 mdb->size, err);
eb1d1641
HX		 650 goto disable;
651 }
652
653 err = -EAGAIN;
654 goto err;
655 }
656
657 return NULL;
658
659err:
660 mp = ERR_PTR(err);
661 return mp;
662}
663
cfd56754 664struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
5e923585
NA		 665 struct net_bridge_port *p,
666 struct br_ip *group)
eb1d1641 667{
e8051688 668 struct net_bridge_mdb_htable *mdb;
eb1d1641
HX		 669 struct net_bridge_mdb_entry *mp;
670 int hash;
4c0833bc 671 int err;
eb1d1641 672
e8051688 673 mdb = rcu_dereference_protected(br->mdb, 1);
eb1d1641 674 if (!mdb) {
4c0833bc
TK		 675 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
676 if (err)
677 return ERR_PTR(err);
eb1d1641
HX		 678 goto rehash;
679 }
680
681 hash = br_ip_hash(mdb, group);
5e923585 682 mp = br_multicast_get_group(br, p, group, hash);
eb1d1641
HX		 683 switch (PTR_ERR(mp)) {
684 case 0:
685 break;
686
687 case -EAGAIN:
688rehash:
e8051688 689 mdb = rcu_dereference_protected(br->mdb, 1);
eb1d1641
HX		 690 hash = br_ip_hash(mdb, group);
691 break;
692
693 default:
694 goto out;
695 }
696
697 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
698 if (unlikely(!mp))
4c0833bc 699 return ERR_PTR(-ENOMEM);
eb1d1641
HX		 700
701 mp->br = br;
8ef2a9a5 702 mp->addr = *group;
1faabf2a
ED		 703 setup_timer(&mp->timer, br_multicast_group_expired,
704 (unsigned long)mp);
705
eb1d1641
HX		 706 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
707 mdb->size++;
708
709out:
710 return mp;
711}
712
cfd56754
CW		 713struct net_bridge_port_group *br_multicast_new_port_group(
714 struct net_bridge_port *port,
715 struct br_ip *group,
ccb1c31a 716 struct net_bridge_port_group __rcu *next,
6db6f0ea
FF		 717 unsigned char flags,
718 const unsigned char *src)
cfd56754
CW		 719{
720 struct net_bridge_port_group *p;
721
722 p = kzalloc(sizeof(*p), GFP_ATOMIC);
723 if (unlikely(!p))
724 return NULL;
725
726 p->addr = *group;
727 p->port = port;
9d06b6d8 728 p->flags = flags;
eca2a43b 729 rcu_assign_pointer(p->next, next);
cfd56754
CW		 730 hlist_add_head(&p->mglist, &port->mglist);
731 setup_timer(&p->timer, br_multicast_port_group_expired,
732 (unsigned long)p);
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) {
8a870178 777 mp->mglist = true;
454594f3 778 mod_timer(&mp->timer, now + br->multicast_membership_interval);
eb1d1641
HX		 779 goto out;
780 }
781
e8051688
ED		 782 for (pp = &mp->ports;
783 (p = mlock_dereference(*pp, br)) != NULL;
784 pp = &p->next) {
6db6f0ea 785 if (br_port_group_equal(p, port, src))
454594f3 786 goto found;
eb1d1641
HX		 787 if ((unsigned long)p->port < (unsigned long)port)
788 break;
789 }
790
6db6f0ea 791 p = br_multicast_new_port_group(port, group, *pp, 0, src);
eb1d1641
HX		 792 if (unlikely(!p))
793 goto err;
eb1d1641 794 rcu_assign_pointer(*pp, p);
45ebcce5 795 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
eb1d1641 796
454594f3
LL		 797found:
798 mod_timer(&p->timer, now + br->multicast_membership_interval);
eb1d1641
HX		 799out:
800 err = 0;
801
802err:
803 spin_unlock(&br->multicast_lock);
804 return err;
805}
806
8ef2a9a5
YH		 807static int br_ip4_multicast_add_group(struct net_bridge *br,
808 struct net_bridge_port *port,
b0e9a30d 809 __be32 group,
6db6f0ea
FF		 810 __u16 vid,
811 const unsigned char *src)
8ef2a9a5
YH		 812{
813 struct br_ip br_group;
814
815 if (ipv4_is_local_multicast(group))
816 return 0;
817
818 br_group.u.ip4 = group;
819 br_group.proto = htons(ETH_P_IP);
b0e9a30d 820 br_group.vid = vid;
8ef2a9a5 821
6db6f0ea 822 return br_multicast_add_group(br, port, &br_group, src);
8ef2a9a5
YH		 823}
824
dfd56b8b 825#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 826static int br_ip6_multicast_add_group(struct net_bridge *br,
827 struct net_bridge_port *port,
b0e9a30d 828 const struct in6_addr *group,
6db6f0ea
FF		 829 __u16 vid,
830 const unsigned char *src)
08b202b6
YH		 831{
832 struct br_ip br_group;
833
3c3769e6 834 if (ipv6_addr_is_ll_all_nodes(group))
08b202b6
YH		 835 return 0;
836
4e3fd7a0 837 br_group.u.ip6 = *group;
9cc6e0c4 838 br_group.proto = htons(ETH_P_IPV6);
b0e9a30d 839 br_group.vid = vid;
08b202b6 840
6db6f0ea 841 return br_multicast_add_group(br, port, &br_group, src);
08b202b6
YH		 842}
843#endif
844
eb1d1641
HX		 845static void br_multicast_router_expired(unsigned long data)
846{
847 struct net_bridge_port *port = (void *)data;
848 struct net_bridge *br = port->br;
849
850 spin_lock(&br->multicast_lock);
a55d8246
NA		 851 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
852 port->multicast_router == MDB_RTR_TYPE_PERM ||
eb1d1641
HX		 853 timer_pending(&port->multicast_router_timer) ||
854 hlist_unhashed(&port->rlist))
855 goto out;
856
857 hlist_del_init_rcu(&port->rlist);
949f1e39 858 br_rtr_notify(br->dev, port, RTM_DELMDB);
a55d8246
NA		 859 /* Don't allow timer refresh if the router expired */
860 if (port->multicast_router == MDB_RTR_TYPE_TEMP)
861 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
eb1d1641
HX		 862
863out:
864 spin_unlock(&br->multicast_lock);
865}
866
867static void br_multicast_local_router_expired(unsigned long data)
868{
869}
870
cc0fdd80 871static void br_multicast_querier_expired(struct net_bridge *br,
90010b36 872 struct bridge_mcast_own_query *query)
c83b8fab 873{
c83b8fab
HX		 874 spin_lock(&br->multicast_lock);
875 if (!netif_running(br->dev) || br->multicast_disabled)
876 goto out;
877
cc0fdd80 878 br_multicast_start_querier(br, query);
c83b8fab
HX		 879
880out:
881 spin_unlock(&br->multicast_lock);
882}
883
cc0fdd80
LL		 884static void br_ip4_multicast_querier_expired(unsigned long data)
885{
886 struct net_bridge *br = (void *)data;
887
90010b36 888 br_multicast_querier_expired(br, &br->ip4_own_query);
cc0fdd80
LL		 889}
890
891#if IS_ENABLED(CONFIG_IPV6)
892static void br_ip6_multicast_querier_expired(unsigned long data)
893{
894 struct net_bridge *br = (void *)data;
895
90010b36 896 br_multicast_querier_expired(br, &br->ip6_own_query);
cc0fdd80
LL		 897}
898#endif
899
dc4eb53a
LL		 900static void br_multicast_select_own_querier(struct net_bridge *br,
901 struct br_ip *ip,
902 struct sk_buff *skb)
903{
904 if (ip->proto == htons(ETH_P_IP))
905 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
906#if IS_ENABLED(CONFIG_IPV6)
907 else
908 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
909#endif
910}
911
8ef2a9a5
YH		 912static void __br_multicast_send_query(struct net_bridge *br,
913 struct net_bridge_port *port,
914 struct br_ip *ip)
eb1d1641 915{
eb1d1641 916 struct sk_buff *skb;
1080ab95 917 u8 igmp_type;
eb1d1641 918
1080ab95 919 skb = br_multicast_alloc_query(br, ip, &igmp_type);
eb1d1641 920 if (!skb)
8ef2a9a5 921 return;
eb1d1641
HX		 922
923 if (port) {
eb1d1641 924 skb->dev = port->dev;
a65056ec 925 br_multicast_count(br, port, skb, igmp_type,
1080ab95 926 BR_MCAST_DIR_TX);
29a26a56
EB		 927 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
928 dev_net(port->dev), NULL, skb, NULL, skb->dev,
f0b4eece 929 br_dev_queue_push_xmit);
dc4eb53a
LL		 930 } else {
931 br_multicast_select_own_querier(br, ip, skb);
a65056ec 932 br_multicast_count(br, port, skb, igmp_type,
1080ab95 933 BR_MCAST_DIR_RX);
eb1d1641 934 netif_rx(skb);
dc4eb53a 935 }
8ef2a9a5
YH		 936}
937
938static void br_multicast_send_query(struct net_bridge *br,
cc0fdd80 939 struct net_bridge_port *port,
90010b36 940 struct bridge_mcast_own_query *own_query)
8ef2a9a5 941{
90010b36 942 struct bridge_mcast_other_query *other_query = NULL;
5e923585
NA		 943 struct br_ip br_group;
944 unsigned long time;
8ef2a9a5
YH		 945
946 if (!netif_running(br->dev) || br->multicast_disabled ||
cc0fdd80 947 !br->multicast_querier)
8ef2a9a5
YH		 948 return;
949
08b202b6
YH		 950 memset(&br_group.u, 0, sizeof(br_group.u));
951
90010b36
LL		 952 if (port ? (own_query == &port->ip4_own_query) :
953 (own_query == &br->ip4_own_query)) {
954 other_query = &br->ip4_other_query;
cc0fdd80 955 br_group.proto = htons(ETH_P_IP);
dfd56b8b 956#if IS_ENABLED(CONFIG_IPV6)
cc0fdd80 957 } else {
90010b36 958 other_query = &br->ip6_other_query;
cc0fdd80 959 br_group.proto = htons(ETH_P_IPV6);
08b202b6 960#endif
cc0fdd80
LL		 961 }
962
90010b36 963 if (!other_query || timer_pending(&other_query->timer))
cc0fdd80
LL		 964 return;
965
966 __br_multicast_send_query(br, port, &br_group);
eb1d1641 967
eb1d1641 968 time = jiffies;
90010b36 969 time += own_query->startup_sent < br->multicast_startup_query_count ?
eb1d1641
HX		 970 br->multicast_startup_query_interval :
971 br->multicast_query_interval;
90010b36 972 mod_timer(&own_query->timer, time);
eb1d1641
HX		 973}
974
90010b36
LL		 975static void
976br_multicast_port_query_expired(struct net_bridge_port *port,
977 struct bridge_mcast_own_query *query)
eb1d1641 978{
eb1d1641
HX		 979 struct net_bridge *br = port->br;
980
981 spin_lock(&br->multicast_lock);
02a780c0
DC		 982 if (port->state == BR_STATE_DISABLED ||
983 port->state == BR_STATE_BLOCKING)
eb1d1641
HX		 984 goto out;
985
cc0fdd80
LL		 986 if (query->startup_sent < br->multicast_startup_query_count)
987 query->startup_sent++;
eb1d1641 988
cc0fdd80 989 br_multicast_send_query(port->br, port, query);
eb1d1641
HX		 990
991out:
992 spin_unlock(&br->multicast_lock);
993}
994
cc0fdd80
LL		 995static void br_ip4_multicast_port_query_expired(unsigned long data)
996{
997 struct net_bridge_port *port = (void *)data;
998
90010b36 999 br_multicast_port_query_expired(port, &port->ip4_own_query);
cc0fdd80
LL		 1000}
1001
1002#if IS_ENABLED(CONFIG_IPV6)
1003static void br_ip6_multicast_port_query_expired(unsigned long data)
1004{
1005 struct net_bridge_port *port = (void *)data;
1006
90010b36 1007 br_multicast_port_query_expired(port, &port->ip6_own_query);
cc0fdd80
LL		 1008}
1009#endif
1010
147c1e9b
NF		 1011static void br_mc_disabled_update(struct net_device *dev, bool value)
1012{
1013 struct switchdev_attr attr = {
1014 .orig_dev = dev,
1015 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
1016 .flags = SWITCHDEV_F_DEFER,
1017 .u.mc_disabled = value,
1018 };
1019
1020 switchdev_port_attr_set(dev, &attr);
1021}
1022
1080ab95 1023int br_multicast_add_port(struct net_bridge_port *port)
eb1d1641 1024{
7f0aec7a 1025 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
eb1d1641
HX		 1026
1027 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
1028 (unsigned long)port);
90010b36
LL		 1029 setup_timer(&port->ip4_own_query.timer,
1030 br_ip4_multicast_port_query_expired, (unsigned long)port);
cc0fdd80 1031#if IS_ENABLED(CONFIG_IPV6)
90010b36
LL		 1032 setup_timer(&port->ip6_own_query.timer,
1033 br_ip6_multicast_port_query_expired, (unsigned long)port);
cc0fdd80 1034#endif
147c1e9b
NF		 1035 br_mc_disabled_update(port->dev, port->br->multicast_disabled);
1036
1080ab95
NA		 1037 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
1038 if (!port->mcast_stats)
1039 return -ENOMEM;
1040
1041 return 0;
eb1d1641
HX		 1042}
1043
1044void br_multicast_del_port(struct net_bridge_port *port)
1045{
e10177ab
SA		 1046 struct net_bridge *br = port->br;
1047 struct net_bridge_port_group *pg;
1048 struct hlist_node *n;
1049
1050 /* Take care of the remaining groups, only perm ones should be left */
1051 spin_lock_bh(&br->multicast_lock);
1052 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1053 br_multicast_del_pg(br, pg);
1054 spin_unlock_bh(&br->multicast_lock);
eb1d1641 1055 del_timer_sync(&port->multicast_router_timer);
1080ab95 1056 free_percpu(port->mcast_stats);
eb1d1641
HX		 1057}
1058
90010b36 1059static void br_multicast_enable(struct bridge_mcast_own_query *query)
561f1103 1060{
cc0fdd80 1061 query->startup_sent = 0;
561f1103 1062
cc0fdd80
LL		 1063 if (try_to_del_timer_sync(&query->timer) >= 0 ||
1064 del_timer(&query->timer))
1065 mod_timer(&query->timer, jiffies);
561f1103
HX		 1066}
1067
7cb3f921 1068static void __br_multicast_enable_port(struct net_bridge_port *port)
eb1d1641
HX		 1069{
1070 struct net_bridge *br = port->br;
1071
eb1d1641 1072 if (br->multicast_disabled || !netif_running(br->dev))
7cb3f921 1073 return;
eb1d1641 1074
90010b36 1075 br_multicast_enable(&port->ip4_own_query);
cc0fdd80 1076#if IS_ENABLED(CONFIG_IPV6)
90010b36 1077 br_multicast_enable(&port->ip6_own_query);
cc0fdd80 1078#endif
7f0aec7a
NA		 1079 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
1080 hlist_unhashed(&port->rlist))
754bc547 1081 br_multicast_add_router(br, port);
7cb3f921 1082}
eb1d1641 1083
7cb3f921
NA		 1084void br_multicast_enable_port(struct net_bridge_port *port)
1085{
1086 struct net_bridge *br = port->br;
1087
1088 spin_lock(&br->multicast_lock);
1089 __br_multicast_enable_port(port);
eb1d1641
HX		 1090 spin_unlock(&br->multicast_lock);
1091}
1092
1093void br_multicast_disable_port(struct net_bridge_port *port)
1094{
1095 struct net_bridge *br = port->br;
1096 struct net_bridge_port_group *pg;
b67bfe0d 1097 struct hlist_node *n;
eb1d1641
HX		 1098
1099 spin_lock(&br->multicast_lock);
b67bfe0d 1100 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
9d06b6d8 1101 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
e10177ab 1102 br_multicast_del_pg(br, pg);
eb1d1641 1103
949f1e39 1104 if (!hlist_unhashed(&port->rlist)) {
eb1d1641 1105 hlist_del_init_rcu(&port->rlist);
949f1e39 1106 br_rtr_notify(br->dev, port, RTM_DELMDB);
a55d8246
NA		 1107 /* Don't allow timer refresh if disabling */
1108 if (port->multicast_router == MDB_RTR_TYPE_TEMP)
1109 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
949f1e39 1110 }
eb1d1641 1111 del_timer(&port->multicast_router_timer);
90010b36 1112 del_timer(&port->ip4_own_query.timer);
cc0fdd80 1113#if IS_ENABLED(CONFIG_IPV6)
90010b36 1114 del_timer(&port->ip6_own_query.timer);
cc0fdd80 1115#endif
eb1d1641
HX		 1116 spin_unlock(&br->multicast_lock);
1117}
1118
8ef2a9a5
YH		 1119static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1120 struct net_bridge_port *port,
06499098
VY		 1121 struct sk_buff *skb,
1122 u16 vid)
eb1d1641 1123{
6db6f0ea 1124 const unsigned char *src;
eb1d1641
HX		 1125 struct igmpv3_report *ih;
1126 struct igmpv3_grec *grec;
1127 int i;
1128 int len;
1129 int num;
1130 int type;
1131 int err = 0;
1132 __be32 group;
1133
eb1d1641
HX		 1134 ih = igmpv3_report_hdr(skb);
1135 num = ntohs(ih->ngrec);
c2d4fbd2 1136 len = skb_transport_offset(skb) + sizeof(*ih);
eb1d1641
HX		 1137
1138 for (i = 0; i < num; i++) {
1139 len += sizeof(*grec);
1140 if (!pskb_may_pull(skb, len))
1141 return -EINVAL;
1142
fd218cf9 1143 grec = (void *)(skb->data + len - sizeof(*grec));
eb1d1641
HX		 1144 group = grec->grec_mca;
1145 type = grec->grec_type;
1146
8eabf95c 1147 len += ntohs(grec->grec_nsrcs) * 4;
eb1d1641
HX		 1148 if (!pskb_may_pull(skb, len))
1149 return -EINVAL;
1150
1151 /* We treat this as an IGMPv2 report for now. */
1152 switch (type) {
1153 case IGMPV3_MODE_IS_INCLUDE:
1154 case IGMPV3_MODE_IS_EXCLUDE:
1155 case IGMPV3_CHANGE_TO_INCLUDE:
1156 case IGMPV3_CHANGE_TO_EXCLUDE:
1157 case IGMPV3_ALLOW_NEW_SOURCES:
1158 case IGMPV3_BLOCK_OLD_SOURCES:
1159 break;
1160
1161 default:
1162 continue;
1163 }
1164
6db6f0ea 1165 src = eth_hdr(skb)->h_source;
bc8c20ac
SA		 1166 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1167 type == IGMPV3_MODE_IS_INCLUDE) &&
1168 ntohs(grec->grec_nsrcs) == 0) {
6db6f0ea 1169 br_ip4_multicast_leave_group(br, port, group, vid, src);
bc8c20ac 1170 } else {
6db6f0ea
FF		 1171 err = br_ip4_multicast_add_group(br, port, group, vid,
1172 src);
bc8c20ac
SA		 1173 if (err)
1174 break;
1175 }
eb1d1641
HX		 1176 }
1177
1178 return err;
1179}
1180
dfd56b8b 1181#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1182static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1183 struct net_bridge_port *port,
06499098
VY		 1184 struct sk_buff *skb,
1185 u16 vid)
08b202b6 1186{
6db6f0ea 1187 const unsigned char *src;
08b202b6
YH		 1188 struct icmp6hdr *icmp6h;
1189 struct mld2_grec *grec;
1190 int i;
1191 int len;
1192 int num;
1193 int err = 0;
1194
1195 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1196 return -EINVAL;
1197
1198 icmp6h = icmp6_hdr(skb);
1199 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
c2d4fbd2 1200 len = skb_transport_offset(skb) + sizeof(*icmp6h);
08b202b6
YH		 1201
1202 for (i = 0; i < num; i++) {
1203 __be16 *nsrcs, _nsrcs;
1204
1205 nsrcs = skb_header_pointer(skb,
1206 len + offsetof(struct mld2_grec,
649e984d 1207 grec_nsrcs),
08b202b6
YH		 1208 sizeof(_nsrcs), &_nsrcs);
1209 if (!nsrcs)
1210 return -EINVAL;
1211
1212 if (!pskb_may_pull(skb,
1213 len + sizeof(*grec) +
d41db9f3 1214 sizeof(struct in6_addr) * ntohs(*nsrcs)))
08b202b6
YH		 1215 return -EINVAL;
1216
1217 grec = (struct mld2_grec *)(skb->data + len);
d41db9f3
LL		 1218 len += sizeof(*grec) +
1219 sizeof(struct in6_addr) * ntohs(*nsrcs);
08b202b6
YH		 1220
1221 /* We treat these as MLDv1 reports for now. */
1222 switch (grec->grec_type) {
1223 case MLD2_MODE_IS_INCLUDE:
1224 case MLD2_MODE_IS_EXCLUDE:
1225 case MLD2_CHANGE_TO_INCLUDE:
1226 case MLD2_CHANGE_TO_EXCLUDE:
1227 case MLD2_ALLOW_NEW_SOURCES:
1228 case MLD2_BLOCK_OLD_SOURCES:
1229 break;
1230
1231 default:
1232 continue;
1233 }
1234
6db6f0ea 1235 src = eth_hdr(skb)->h_source;
bc8c20ac
SA		 1236 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1237 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1238 ntohs(*nsrcs) == 0) {
1239 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
6db6f0ea 1240 vid, src);
bc8c20ac
SA		 1241 } else {
1242 err = br_ip6_multicast_add_group(br, port,
6db6f0ea
FF		 1243 &grec->grec_mca, vid,
1244 src);
9264251e 1245 if (err)
bc8c20ac
SA		 1246 break;
1247 }
08b202b6
YH		 1248 }
1249
1250 return err;
1251}
1252#endif
1253
dc4eb53a 1254static bool br_ip4_multicast_select_querier(struct net_bridge *br,
2cd41431 1255 struct net_bridge_port *port,
dc4eb53a
LL		 1256 __be32 saddr)
1257{
1258 if (!timer_pending(&br->ip4_own_query.timer) &&
1259 !timer_pending(&br->ip4_other_query.timer))
1260 goto update;
1261
1262 if (!br->ip4_querier.addr.u.ip4)
1263 goto update;
1264
1265 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1266 goto update;
1267
1268 return false;
1269
1270update:
1271 br->ip4_querier.addr.u.ip4 = saddr;
1272
2cd41431
LL		 1273 /* update protected by general multicast_lock by caller */
1274 rcu_assign_pointer(br->ip4_querier.port, port);
1275
dc4eb53a
LL		 1276 return true;
1277}
1278
1279#if IS_ENABLED(CONFIG_IPV6)
1280static bool br_ip6_multicast_select_querier(struct net_bridge *br,
2cd41431 1281 struct net_bridge_port *port,
dc4eb53a
LL		 1282 struct in6_addr *saddr)
1283{
1284 if (!timer_pending(&br->ip6_own_query.timer) &&
1285 !timer_pending(&br->ip6_other_query.timer))
1286 goto update;
1287
1288 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1289 goto update;
1290
1291 return false;
1292
1293update:
1294 br->ip6_querier.addr.u.ip6 = *saddr;
1295
2cd41431
LL		 1296 /* update protected by general multicast_lock by caller */
1297 rcu_assign_pointer(br->ip6_querier.port, port);
1298
dc4eb53a
LL		 1299 return true;
1300}
1301#endif
1302
1303static bool br_multicast_select_querier(struct net_bridge *br,
2cd41431 1304 struct net_bridge_port *port,
dc4eb53a
LL		 1305 struct br_ip *saddr)
1306{
1307 switch (saddr->proto) {
1308 case htons(ETH_P_IP):
2cd41431 1309 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
dc4eb53a
LL		 1310#if IS_ENABLED(CONFIG_IPV6)
1311 case htons(ETH_P_IPV6):
2cd41431 1312 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
dc4eb53a
LL		 1313#endif
1314 }
1315
1316 return false;
1317}
1318
cc0fdd80 1319static void
90010b36
LL		 1320br_multicast_update_query_timer(struct net_bridge *br,
1321 struct bridge_mcast_other_query *query,
1322 unsigned long max_delay)
b00589af 1323{
90010b36
LL		 1324 if (!timer_pending(&query->timer))
1325 query->delay_time = jiffies + max_delay;
b00589af 1326
90010b36 1327 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
b00589af
LL		 1328}
1329
7e80c124 1330/*
7c77602f 1331 * Add port to router_list
7e80c124 1332 * list is maintained ordered by pointer value
1333 * and locked by br->multicast_lock and RCU
1334 */
0909e117
HX		 1335static void br_multicast_add_router(struct net_bridge *br,
1336 struct net_bridge_port *port)
1337{
dcdca2c4 1338 struct net_bridge_port *p;
b67bfe0d 1339 struct hlist_node *slot = NULL;
dcdca2c4 1340
1a040eac
NA		 1341 if (!hlist_unhashed(&port->rlist))
1342 return;
1343
b67bfe0d 1344 hlist_for_each_entry(p, &br->router_list, rlist) {
7e80c124 1345 if ((unsigned long) port >= (unsigned long) p)
1346 break;
b67bfe0d 1347 slot = &p->rlist;
dcdca2c4 1348 }
1349
7e80c124 1350 if (slot)
1d023284 1351 hlist_add_behind_rcu(&port->rlist, slot);
dcdca2c4 1352 else
1353 hlist_add_head_rcu(&port->rlist, &br->router_list);
949f1e39 1354 br_rtr_notify(br->dev, port, RTM_NEWMDB);
0909e117
HX		 1355}
1356
eb1d1641
HX		 1357static void br_multicast_mark_router(struct net_bridge *br,
1358 struct net_bridge_port *port)
1359{
1360 unsigned long now = jiffies;
eb1d1641
HX		 1361
1362 if (!port) {
7f0aec7a 1363 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY)
eb1d1641
HX		 1364 mod_timer(&br->multicast_router_timer,
1365 now + br->multicast_querier_interval);
1366 return;
1367 }
1368
a55d8246
NA		 1369 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1370 port->multicast_router == MDB_RTR_TYPE_PERM)
eb1d1641
HX		 1371 return;
1372
0909e117 1373 br_multicast_add_router(br, port);
eb1d1641 1374
eb1d1641
HX		 1375 mod_timer(&port->multicast_router_timer,
1376 now + br->multicast_querier_interval);
1377}
1378
1379static void br_multicast_query_received(struct net_bridge *br,
1380 struct net_bridge_port *port,
90010b36 1381 struct bridge_mcast_other_query *query,
dc4eb53a 1382 struct br_ip *saddr,
b00589af 1383 unsigned long max_delay)
eb1d1641 1384{
2cd41431 1385 if (!br_multicast_select_querier(br, port, saddr))
eb1d1641
HX		 1386 return;
1387
dc4eb53a 1388 br_multicast_update_query_timer(br, query, max_delay);
eb1d1641
HX		 1389 br_multicast_mark_router(br, port);
1390}
1391
8ef2a9a5
YH		 1392static int br_ip4_multicast_query(struct net_bridge *br,
1393 struct net_bridge_port *port,
06499098
VY		 1394 struct sk_buff *skb,
1395 u16 vid)
eb1d1641 1396{
b71d1d42 1397 const struct iphdr *iph = ip_hdr(skb);
eb1d1641
HX		 1398 struct igmphdr *ih = igmp_hdr(skb);
1399 struct net_bridge_mdb_entry *mp;
1400 struct igmpv3_query *ih3;
1401 struct net_bridge_port_group *p;
e8051688 1402 struct net_bridge_port_group __rcu **pp;
dc4eb53a 1403 struct br_ip saddr;
eb1d1641
HX		 1404 unsigned long max_delay;
1405 unsigned long now = jiffies;
856ce5d0 1406 unsigned int offset = skb_transport_offset(skb);
eb1d1641 1407 __be32 group;
bec68ff1 1408 int err = 0;
eb1d1641
HX		 1409
1410 spin_lock(&br->multicast_lock);
1411 if (!netif_running(br->dev) ||
1412 (port && port->state == BR_STATE_DISABLED))
1413 goto out;
1414
eb1d1641
HX		 1415 group = ih->group;
1416
856ce5d0 1417 if (skb->len == offset + sizeof(*ih)) {
eb1d1641
HX		 1418 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1419
1420 if (!max_delay) {
1421 max_delay = 10 * HZ;
1422 group = 0;
1423 }
856ce5d0 1424 } else if (skb->len >= offset + sizeof(*ih3)) {
eb1d1641
HX		 1425 ih3 = igmpv3_query_hdr(skb);
1426 if (ih3->nsrcs)
bec68ff1 1427 goto out;
eb1d1641 1428
0ba8c9ec
YH		 1429 max_delay = ih3->code ?
1430 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
9afd85c9 1431 } else {
9ed973cc
LL		 1432 goto out;
1433 }
1434
dc4eb53a
LL		 1435 if (!group) {
1436 saddr.proto = htons(ETH_P_IP);
1437 saddr.u.ip4 = iph->saddr;
b00589af 1438
dc4eb53a
LL		 1439 br_multicast_query_received(br, port, &br->ip4_other_query,
1440 &saddr, max_delay);
eb1d1641 1441 goto out;
dc4eb53a 1442 }
eb1d1641 1443
b0e9a30d 1444 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
eb1d1641
HX		 1445 if (!mp)
1446 goto out;
1447
1448 max_delay *= br->multicast_last_member_count;
1449
8a870178 1450 if (mp->mglist &&
eb1d1641
HX		 1451 (timer_pending(&mp->timer) ?
1452 time_after(mp->timer.expires, now + max_delay) :
1453 try_to_del_timer_sync(&mp->timer) >= 0))
1454 mod_timer(&mp->timer, now + max_delay);
1455
e8051688
ED		 1456 for (pp = &mp->ports;
1457 (p = mlock_dereference(*pp, br)) != NULL;
1458 pp = &p->next) {
eb1d1641
HX		 1459 if (timer_pending(&p->timer) ?
1460 time_after(p->timer.expires, now + max_delay) :
1461 try_to_del_timer_sync(&p->timer) >= 0)
24f9cdcb 1462 mod_timer(&p->timer, now + max_delay);
eb1d1641
HX		 1463 }
1464
1465out:
1466 spin_unlock(&br->multicast_lock);
bec68ff1 1467 return err;
eb1d1641
HX		 1468}
1469
dfd56b8b 1470#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1471static int br_ip6_multicast_query(struct net_bridge *br,
1472 struct net_bridge_port *port,
06499098
VY		 1473 struct sk_buff *skb,
1474 u16 vid)
08b202b6 1475{
b71d1d42 1476 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
eca2a43b 1477 struct mld_msg *mld;
08b202b6
YH		 1478 struct net_bridge_mdb_entry *mp;
1479 struct mld2_query *mld2q;
e8051688
ED		 1480 struct net_bridge_port_group *p;
1481 struct net_bridge_port_group __rcu **pp;
dc4eb53a 1482 struct br_ip saddr;
08b202b6
YH		 1483 unsigned long max_delay;
1484 unsigned long now = jiffies;
856ce5d0 1485 unsigned int offset = skb_transport_offset(skb);
b71d1d42 1486 const struct in6_addr *group = NULL;
9ed973cc 1487 bool is_general_query;
08b202b6
YH		 1488 int err = 0;
1489
1490 spin_lock(&br->multicast_lock);
1491 if (!netif_running(br->dev) ||
1492 (port && port->state == BR_STATE_DISABLED))
1493 goto out;
1494
856ce5d0
LL		 1495 if (skb->len == offset + sizeof(*mld)) {
1496 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
08b202b6
YH		 1497 err = -EINVAL;
1498 goto out;
1499 }
1500 mld = (struct mld_msg *) icmp6_hdr(skb);
4715213d 1501 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
08b202b6
YH		 1502 if (max_delay)
1503 group = &mld->mld_mca;
248ba8ec 1504 } else {
856ce5d0 1505 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
08b202b6
YH		 1506 err = -EINVAL;
1507 goto out;
1508 }
1509 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1510 if (!mld2q->mld2q_nsrcs)
1511 group = &mld2q->mld2q_mca;
e3f5b170
DB		 1512
1513 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
08b202b6
YH		 1514 }
1515
9ed973cc
LL		 1516 is_general_query = group && ipv6_addr_any(group);
1517
dc4eb53a
LL		 1518 if (is_general_query) {
1519 saddr.proto = htons(ETH_P_IPV6);
1520 saddr.u.ip6 = ip6h->saddr;
b00589af 1521
dc4eb53a
LL		 1522 br_multicast_query_received(br, port, &br->ip6_other_query,
1523 &saddr, max_delay);
08b202b6 1524 goto out;
6c03ee8b
LL		 1525 } else if (!group) {
1526 goto out;
dc4eb53a 1527 }
08b202b6 1528
b0e9a30d 1529 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
08b202b6
YH		 1530 if (!mp)
1531 goto out;
1532
1533 max_delay *= br->multicast_last_member_count;
8a870178 1534 if (mp->mglist &&
08b202b6
YH		 1535 (timer_pending(&mp->timer) ?
1536 time_after(mp->timer.expires, now + max_delay) :
1537 try_to_del_timer_sync(&mp->timer) >= 0))
1538 mod_timer(&mp->timer, now + max_delay);
1539
e8051688
ED		 1540 for (pp = &mp->ports;
1541 (p = mlock_dereference(*pp, br)) != NULL;
1542 pp = &p->next) {
08b202b6
YH		 1543 if (timer_pending(&p->timer) ?
1544 time_after(p->timer.expires, now + max_delay) :
1545 try_to_del_timer_sync(&p->timer) >= 0)
24f9cdcb 1546 mod_timer(&p->timer, now + max_delay);
08b202b6
YH		 1547 }
1548
1549out:
1550 spin_unlock(&br->multicast_lock);
1551 return err;
1552}
1553#endif
1554
90010b36
LL		 1555static void
1556br_multicast_leave_group(struct net_bridge *br,
1557 struct net_bridge_port *port,
1558 struct br_ip *group,
1559 struct bridge_mcast_other_query *other_query,
6db6f0ea
FF		 1560 struct bridge_mcast_own_query *own_query,
1561 const unsigned char *src)
eb1d1641
HX		 1562{
1563 struct net_bridge_mdb_htable *mdb;
1564 struct net_bridge_mdb_entry *mp;
1565 struct net_bridge_port_group *p;
1566 unsigned long now;
1567 unsigned long time;
1568
eb1d1641
HX		 1569 spin_lock(&br->multicast_lock);
1570 if (!netif_running(br->dev) ||
544586f7 1571 (port && port->state == BR_STATE_DISABLED))
eb1d1641
HX		 1572 goto out;
1573
e8051688 1574 mdb = mlock_dereference(br->mdb, br);
eb1d1641
HX		 1575 mp = br_mdb_ip_get(mdb, group);
1576 if (!mp)
1577 goto out;
1578
544586f7
SA		 1579 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1580 struct net_bridge_port_group __rcu **pp;
1581
1582 for (pp = &mp->ports;
1583 (p = mlock_dereference(*pp, br)) != NULL;
1584 pp = &p->next) {
6db6f0ea 1585 if (!br_port_group_equal(p, port, src))
544586f7
SA		 1586 continue;
1587
1588 rcu_assign_pointer(*pp, p->next);
1589 hlist_del_init(&p->mglist);
1590 del_timer(&p->timer);
1591 call_rcu_bh(&p->rcu, br_multicast_free_pg);
45ebcce5
ER		 1592 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1593 p->flags);
544586f7
SA		 1594
1595 if (!mp->ports && !mp->mglist &&
1596 netif_running(br->dev))
1597 mod_timer(&mp->timer, jiffies);
1598 }
1599 goto out;
1600 }
1601
1602 if (timer_pending(&other_query->timer))
1603 goto out;
1604
cc0fdd80 1605 if (br->multicast_querier) {
6b7df111
CW		 1606 __br_multicast_send_query(br, port, &mp->addr);
1607
1608 time = jiffies + br->multicast_last_member_count *
1609 br->multicast_last_member_interval;
cc0fdd80 1610
90010b36 1611 mod_timer(&own_query->timer, time);
6b7df111
CW		 1612
1613 for (p = mlock_dereference(mp->ports, br);
1614 p != NULL;
1615 p = mlock_dereference(p->next, br)) {
6db6f0ea 1616 if (!br_port_group_equal(p, port, src))
6b7df111
CW		 1617 continue;
1618
1619 if (!hlist_unhashed(&p->mglist) &&
1620 (timer_pending(&p->timer) ?
1621 time_after(p->timer.expires, time) :
1622 try_to_del_timer_sync(&p->timer) >= 0)) {
1623 mod_timer(&p->timer, time);
1624 }
1625
1626 break;
1627 }
1628 }
1629
eb1d1641
HX		 1630 now = jiffies;
1631 time = now + br->multicast_last_member_count *
1632 br->multicast_last_member_interval;
1633
1634 if (!port) {
454594f3 1635 if (mp->mglist &&
eb1d1641
HX		 1636 (timer_pending(&mp->timer) ?
1637 time_after(mp->timer.expires, time) :
1638 try_to_del_timer_sync(&mp->timer) >= 0)) {
1639 mod_timer(&mp->timer, time);
eb1d1641 1640 }
454594f3
LL		 1641
1642 goto out;
1643 }
1644
1645 for (p = mlock_dereference(mp->ports, br);
1646 p != NULL;
1647 p = mlock_dereference(p->next, br)) {
1648 if (p->port != port)
1649 continue;
1650
1651 if (!hlist_unhashed(&p->mglist) &&
1652 (timer_pending(&p->timer) ?
1653 time_after(p->timer.expires, time) :
1654 try_to_del_timer_sync(&p->timer) >= 0)) {
1655 mod_timer(&p->timer, time);
1656 }
1657
1658 break;
eb1d1641 1659 }
eb1d1641
HX		 1660out:
1661 spin_unlock(&br->multicast_lock);
1662}
1663
8ef2a9a5
YH		 1664static void br_ip4_multicast_leave_group(struct net_bridge *br,
1665 struct net_bridge_port *port,
b0e9a30d 1666 __be32 group,
6db6f0ea
FF		 1667 __u16 vid,
1668 const unsigned char *src)
8ef2a9a5
YH		 1669{
1670 struct br_ip br_group;
90010b36 1671 struct bridge_mcast_own_query *own_query;
8ef2a9a5
YH		 1672
1673 if (ipv4_is_local_multicast(group))
1674 return;
1675
90010b36
LL		 1676 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1677
8ef2a9a5
YH		 1678 br_group.u.ip4 = group;
1679 br_group.proto = htons(ETH_P_IP);
b0e9a30d 1680 br_group.vid = vid;
8ef2a9a5 1681
90010b36 1682 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
6db6f0ea 1683 own_query, src);
8ef2a9a5
YH		 1684}
1685
dfd56b8b 1686#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1687static void br_ip6_multicast_leave_group(struct net_bridge *br,
1688 struct net_bridge_port *port,
b0e9a30d 1689 const struct in6_addr *group,
6db6f0ea
FF		 1690 __u16 vid,
1691 const unsigned char *src)
08b202b6
YH		 1692{
1693 struct br_ip br_group;
90010b36 1694 struct bridge_mcast_own_query *own_query;
08b202b6 1695
3c3769e6 1696 if (ipv6_addr_is_ll_all_nodes(group))
08b202b6
YH		 1697 return;
1698
90010b36
LL		 1699 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1700
4e3fd7a0 1701 br_group.u.ip6 = *group;
08b202b6 1702 br_group.proto = htons(ETH_P_IPV6);
b0e9a30d 1703 br_group.vid = vid;
08b202b6 1704
90010b36 1705 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
6db6f0ea 1706 own_query, src);
08b202b6
YH		 1707}
1708#endif
8ef2a9a5 1709
1080ab95
NA		 1710static void br_multicast_err_count(const struct net_bridge *br,
1711 const struct net_bridge_port *p,
1712 __be16 proto)
1713{
1714 struct bridge_mcast_stats __percpu *stats;
1715 struct bridge_mcast_stats *pstats;
1716
1717 if (!br->multicast_stats_enabled)
1718 return;
1719
1720 if (p)
1721 stats = p->mcast_stats;
1722 else
1723 stats = br->mcast_stats;
1724 if (WARN_ON(!stats))
1725 return;
1726
1727 pstats = this_cpu_ptr(stats);
1728
1729 u64_stats_update_begin(&pstats->syncp);
1730 switch (proto) {
1731 case htons(ETH_P_IP):
1732 pstats->mstats.igmp_parse_errors++;
1733 break;
1734#if IS_ENABLED(CONFIG_IPV6)
1735 case htons(ETH_P_IPV6):
1736 pstats->mstats.mld_parse_errors++;
1737 break;
1738#endif
1739 }
1740 u64_stats_update_end(&pstats->syncp);
1741}
1742
91b02d3d
NA		 1743static void br_multicast_pim(struct net_bridge *br,
1744 struct net_bridge_port *port,
1745 const struct sk_buff *skb)
1746{
1747 unsigned int offset = skb_transport_offset(skb);
1748 struct pimhdr *pimhdr, _pimhdr;
1749
1750 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1751 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1752 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1753 return;
1754
1755 br_multicast_mark_router(br, port);
1756}
1757
eb1d1641
HX		 1758static int br_multicast_ipv4_rcv(struct net_bridge *br,
1759 struct net_bridge_port *port,
06499098
VY		 1760 struct sk_buff *skb,
1761 u16 vid)
eb1d1641 1762{
9afd85c9 1763 struct sk_buff *skb_trimmed = NULL;
6db6f0ea 1764 const unsigned char *src;
eb1d1641 1765 struct igmphdr *ih;
eb1d1641
HX		 1766 int err;
1767
9afd85c9 1768 err = ip_mc_check_igmp(skb, &skb_trimmed);
eb1d1641 1769
9afd85c9 1770 if (err == -ENOMSG) {
91b02d3d 1771 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
bd4265fe 1772 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
91b02d3d
NA		 1773 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1774 if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1775 br_multicast_pim(br, port, skb);
1776 }
eb1d1641 1777 return 0;
9afd85c9 1778 } else if (err < 0) {
1080ab95 1779 br_multicast_err_count(br, port, skb->protocol);
9afd85c9 1780 return err;
bd4265fe 1781 }
eb1d1641 1782
9afd85c9 1783 ih = igmp_hdr(skb);
6db6f0ea 1784 src = eth_hdr(skb)->h_source;
1080ab95 1785 BR_INPUT_SKB_CB(skb)->igmp = ih->type;
eb1d1641
HX		 1786
1787 switch (ih->type) {
1788 case IGMP_HOST_MEMBERSHIP_REPORT:
1789 case IGMPV2_HOST_MEMBERSHIP_REPORT:
62b2bcb4 1790 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
6db6f0ea 1791 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
eb1d1641
HX		 1792 break;
1793 case IGMPV3_HOST_MEMBERSHIP_REPORT:
9afd85c9 1794 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
eb1d1641
HX		 1795 break;
1796 case IGMP_HOST_MEMBERSHIP_QUERY:
9afd85c9 1797 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
eb1d1641
HX		 1798 break;
1799 case IGMP_HOST_LEAVE_MESSAGE:
6db6f0ea 1800 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
eb1d1641
HX		 1801 break;
1802 }
1803
a516993f 1804 if (skb_trimmed && skb_trimmed != skb)
9afd85c9
LL		 1805 kfree_skb(skb_trimmed);
1806
a65056ec 1807 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1080ab95
NA		 1808 BR_MCAST_DIR_RX);
1809
eb1d1641
HX		 1810 return err;
1811}
1812
dfd56b8b 1813#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1814static int br_multicast_ipv6_rcv(struct net_bridge *br,
1815 struct net_bridge_port *port,
06499098
VY		 1816 struct sk_buff *skb,
1817 u16 vid)
08b202b6 1818{
9afd85c9 1819 struct sk_buff *skb_trimmed = NULL;
6db6f0ea 1820 const unsigned char *src;
9afd85c9 1821 struct mld_msg *mld;
08b202b6
YH		 1822 int err;
1823
9afd85c9 1824 err = ipv6_mc_check_mld(skb, &skb_trimmed);
08b202b6 1825
9afd85c9
LL		 1826 if (err == -ENOMSG) {
1827 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1828 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
08b202b6 1829 return 0;
9afd85c9 1830 } else if (err < 0) {
1080ab95 1831 br_multicast_err_count(br, port, skb->protocol);
9afd85c9 1832 return err;
08b202b6
YH		 1833 }
1834
9afd85c9 1835 mld = (struct mld_msg *)skb_transport_header(skb);
1080ab95 1836 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
08b202b6 1837
9afd85c9 1838 switch (mld->mld_type) {
08b202b6 1839 case ICMPV6_MGM_REPORT:
6db6f0ea 1840 src = eth_hdr(skb)->h_source;
fc2af6c7 1841 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
6db6f0ea
FF		 1842 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
1843 src);
08b202b6 1844 break;
08b202b6 1845 case ICMPV6_MLD2_REPORT:
9afd85c9 1846 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
08b202b6
YH		 1847 break;
1848 case ICMPV6_MGM_QUERY:
9afd85c9 1849 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
08b202b6
YH		 1850 break;
1851 case ICMPV6_MGM_REDUCTION:
6db6f0ea
FF		 1852 src = eth_hdr(skb)->h_source;
1853 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
9afd85c9 1854 break;
08b202b6
YH		 1855 }
1856
a516993f 1857 if (skb_trimmed && skb_trimmed != skb)
9afd85c9
LL		 1858 kfree_skb(skb_trimmed);
1859
a65056ec 1860 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1080ab95
NA		 1861 BR_MCAST_DIR_RX);
1862
08b202b6
YH		 1863 return err;
1864}
1865#endif
1866
eb1d1641 1867int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
06499098 1868 struct sk_buff *skb, u16 vid)
eb1d1641 1869{
1080ab95
NA		 1870 int ret = 0;
1871
1fafc7a9
YH		 1872 BR_INPUT_SKB_CB(skb)->igmp = 0;
1873 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1874
eb1d1641
HX		 1875 if (br->multicast_disabled)
1876 return 0;
1877
1878 switch (skb->protocol) {
1879 case htons(ETH_P_IP):
1080ab95
NA		 1880 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1881 break;
dfd56b8b 1882#if IS_ENABLED(CONFIG_IPV6)
08b202b6 1883 case htons(ETH_P_IPV6):
1080ab95
NA		 1884 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1885 break;
08b202b6 1886#endif
eb1d1641
HX		 1887 }
1888
1080ab95 1889 return ret;
eb1d1641
HX		 1890}
1891
cc0fdd80 1892static void br_multicast_query_expired(struct net_bridge *br,
2cd41431
LL		 1893 struct bridge_mcast_own_query *query,
1894 struct bridge_mcast_querier *querier)
cc0fdd80
LL		 1895{
1896 spin_lock(&br->multicast_lock);
1897 if (query->startup_sent < br->multicast_startup_query_count)
1898 query->startup_sent++;
1899
71d9f614 1900 RCU_INIT_POINTER(querier->port, NULL);
cc0fdd80
LL		 1901 br_multicast_send_query(br, NULL, query);
1902 spin_unlock(&br->multicast_lock);
1903}
1904
1905static void br_ip4_multicast_query_expired(unsigned long data)
eb1d1641
HX		 1906{
1907 struct net_bridge *br = (void *)data;
1908
2cd41431 1909 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
cc0fdd80 1910}
eb1d1641 1911
cc0fdd80
LL		 1912#if IS_ENABLED(CONFIG_IPV6)
1913static void br_ip6_multicast_query_expired(unsigned long data)
1914{
1915 struct net_bridge *br = (void *)data;
eb1d1641 1916
2cd41431 1917 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
eb1d1641 1918}
cc0fdd80 1919#endif
eb1d1641
HX		 1920
1921void br_multicast_init(struct net_bridge *br)
1922{
1923 br->hash_elasticity = 4;
1924 br->hash_max = 512;
1925
7f0aec7a 1926 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
c5c23260 1927 br->multicast_querier = 0;
1c8ad5bf 1928 br->multicast_query_use_ifaddr = 0;
eb1d1641
HX		 1929 br->multicast_last_member_count = 2;
1930 br->multicast_startup_query_count = 2;
1931
1932 br->multicast_last_member_interval = HZ;
1933 br->multicast_query_response_interval = 10 * HZ;
1934 br->multicast_startup_query_interval = 125 * HZ / 4;
1935 br->multicast_query_interval = 125 * HZ;
1936 br->multicast_querier_interval = 255 * HZ;
1937 br->multicast_membership_interval = 260 * HZ;
1938
90010b36 1939 br->ip4_other_query.delay_time = 0;
2cd41431 1940 br->ip4_querier.port = NULL;
aa2ae3e7 1941 br->multicast_igmp_version = 2;
cc0fdd80 1942#if IS_ENABLED(CONFIG_IPV6)
aa2ae3e7 1943 br->multicast_mld_version = 1;
90010b36 1944 br->ip6_other_query.delay_time = 0;
2cd41431 1945 br->ip6_querier.port = NULL;
cc0fdd80 1946#endif
0888d5f3 1947 br->has_ipv6_addr = 1;
b00589af 1948
eb1d1641
HX		 1949 spin_lock_init(&br->multicast_lock);
1950 setup_timer(&br->multicast_router_timer,
1951 br_multicast_local_router_expired, 0);
90010b36
LL		 1952 setup_timer(&br->ip4_other_query.timer,
1953 br_ip4_multicast_querier_expired, (unsigned long)br);
1954 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
eb1d1641 1955 (unsigned long)br);
cc0fdd80 1956#if IS_ENABLED(CONFIG_IPV6)
90010b36
LL		 1957 setup_timer(&br->ip6_other_query.timer,
1958 br_ip6_multicast_querier_expired, (unsigned long)br);
1959 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
cc0fdd80
LL		 1960 (unsigned long)br);
1961#endif
eb1d1641
HX		 1962}
1963
cc0fdd80 1964static void __br_multicast_open(struct net_bridge *br,
90010b36 1965 struct bridge_mcast_own_query *query)
eb1d1641 1966{
cc0fdd80 1967 query->startup_sent = 0;
eb1d1641
HX		 1968
1969 if (br->multicast_disabled)
1970 return;
1971
cc0fdd80
LL		 1972 mod_timer(&query->timer, jiffies);
1973}
1974
1975void br_multicast_open(struct net_bridge *br)
1976{
90010b36 1977 __br_multicast_open(br, &br->ip4_own_query);
cc0fdd80 1978#if IS_ENABLED(CONFIG_IPV6)
90010b36 1979 __br_multicast_open(br, &br->ip6_own_query);
cc0fdd80 1980#endif
eb1d1641
HX		 1981}
1982
1983void br_multicast_stop(struct net_bridge *br)
1984{
eb1d1641 1985 del_timer_sync(&br->multicast_router_timer);
90010b36
LL		 1986 del_timer_sync(&br->ip4_other_query.timer);
1987 del_timer_sync(&br->ip4_own_query.timer);
cc0fdd80 1988#if IS_ENABLED(CONFIG_IPV6)
90010b36
LL		 1989 del_timer_sync(&br->ip6_other_query.timer);
1990 del_timer_sync(&br->ip6_own_query.timer);
cc0fdd80 1991#endif
e10177ab
SA		 1992}
1993
1994void br_multicast_dev_del(struct net_bridge *br)
1995{
1996 struct net_bridge_mdb_htable *mdb;
1997 struct net_bridge_mdb_entry *mp;
1998 struct hlist_node *n;
1999 u32 ver;
2000 int i;
eb1d1641
HX		 2001
2002 spin_lock_bh(&br->multicast_lock);
e8051688 2003 mdb = mlock_dereference(br->mdb, br);
eb1d1641
HX		 2004 if (!mdb)
2005 goto out;
2006
2007 br->mdb = NULL;
2008
2009 ver = mdb->ver;
2010 for (i = 0; i < mdb->max; i++) {
b67bfe0d 2011 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
eb1d1641
HX		 2012 hlist[ver]) {
2013 del_timer(&mp->timer);
eb1d1641
HX		 2014 call_rcu_bh(&mp->rcu, br_multicast_free_group);
2015 }
2016 }
2017
2018 if (mdb->old) {
2019 spin_unlock_bh(&br->multicast_lock);
10cc2b50 2020 rcu_barrier_bh();
eb1d1641
HX		 2021 spin_lock_bh(&br->multicast_lock);
2022 WARN_ON(mdb->old);
2023 }
2024
2025 mdb->old = mdb;
2026 call_rcu_bh(&mdb->rcu, br_mdb_free);
2027
2028out:
2029 spin_unlock_bh(&br->multicast_lock);
1080ab95
NA		 2030
2031 free_percpu(br->mcast_stats);
eb1d1641 2032}
0909e117
HX		 2033
2034int br_multicast_set_router(struct net_bridge *br, unsigned long val)
2035{
6ae4ae8e 2036 int err = -EINVAL;
0909e117
HX		 2037
2038 spin_lock_bh(&br->multicast_lock);
0909e117
HX		 2039
2040 switch (val) {
7f0aec7a
NA		 2041 case MDB_RTR_TYPE_DISABLED:
2042 case MDB_RTR_TYPE_PERM:
0909e117
HX		 2043 del_timer(&br->multicast_router_timer);
2044 /* fall through */
7f0aec7a 2045 case MDB_RTR_TYPE_TEMP_QUERY:
0909e117
HX		 2046 br->multicast_router = val;
2047 err = 0;
2048 break;
0909e117
HX		 2049 }
2050
0909e117
HX		 2051 spin_unlock_bh(&br->multicast_lock);
2052
2053 return err;
2054}
2055
7f0aec7a
NA		 2056static void __del_port_router(struct net_bridge_port *p)
2057{
2058 if (hlist_unhashed(&p->rlist))
2059 return;
2060 hlist_del_init_rcu(&p->rlist);
2061 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
2062}
2063
0909e117
HX		 2064int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
2065{
2066 struct net_bridge *br = p->br;
a55d8246 2067 unsigned long now = jiffies;
6ae4ae8e 2068 int err = -EINVAL;
0909e117
HX		 2069
2070 spin_lock(&br->multicast_lock);
4950cfd1 2071 if (p->multicast_router == val) {
a55d8246
NA		 2072 /* Refresh the temp router port timer */
2073 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2074 mod_timer(&p->multicast_router_timer,
2075 now + br->multicast_querier_interval);
4950cfd1
NA		 2076 err = 0;
2077 goto unlock;
2078 }
0909e117 2079 switch (val) {
7f0aec7a
NA		 2080 case MDB_RTR_TYPE_DISABLED:
2081 p->multicast_router = MDB_RTR_TYPE_DISABLED;
2082 __del_port_router(p);
2083 del_timer(&p->multicast_router_timer);
2084 break;
2085 case MDB_RTR_TYPE_TEMP_QUERY:
2086 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2087 __del_port_router(p);
2088 break;
2089 case MDB_RTR_TYPE_PERM:
2090 p->multicast_router = MDB_RTR_TYPE_PERM;
0909e117 2091 del_timer(&p->multicast_router_timer);
0909e117
HX		 2092 br_multicast_add_router(br, p);
2093 break;
a55d8246
NA		 2094 case MDB_RTR_TYPE_TEMP:
2095 p->multicast_router = MDB_RTR_TYPE_TEMP;
2096 br_multicast_mark_router(br, p);
2097 break;
7f0aec7a
NA		 2098 default:
2099 goto unlock;
0909e117 2100 }
7f0aec7a
NA		 2101 err = 0;
2102unlock:
0909e117
HX		 2103 spin_unlock(&br->multicast_lock);
2104
2105 return err;
2106}
561f1103 2107
cc0fdd80 2108static void br_multicast_start_querier(struct net_bridge *br,
90010b36 2109 struct bridge_mcast_own_query *query)
561f1103
HX		 2110{
2111 struct net_bridge_port *port;
74857216 2112
cc0fdd80 2113 __br_multicast_open(br, query);
74857216
HX		 2114
2115 list_for_each_entry(port, &br->port_list, list) {
2116 if (port->state == BR_STATE_DISABLED ||
2117 port->state == BR_STATE_BLOCKING)
2118 continue;
2119
90010b36
LL		 2120 if (query == &br->ip4_own_query)
2121 br_multicast_enable(&port->ip4_own_query);
cc0fdd80
LL		 2122#if IS_ENABLED(CONFIG_IPV6)
2123 else
90010b36 2124 br_multicast_enable(&port->ip6_own_query);
cc0fdd80 2125#endif
74857216
HX		 2126 }
2127}
2128
2129int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2130{
e8051688 2131 struct net_bridge_mdb_htable *mdb;
7cb3f921
NA		 2132 struct net_bridge_port *port;
2133 int err = 0;
561f1103 2134
ef5e0d82 2135 spin_lock_bh(&br->multicast_lock);
561f1103
HX		 2136 if (br->multicast_disabled == !val)
2137 goto unlock;
2138
147c1e9b 2139 br_mc_disabled_update(br->dev, !val);
561f1103
HX		 2140 br->multicast_disabled = !val;
2141 if (br->multicast_disabled)
2142 goto unlock;
2143
3a7fda06
HX		 2144 if (!netif_running(br->dev))
2145 goto unlock;
2146
e8051688
ED		 2147 mdb = mlock_dereference(br->mdb, br);
2148 if (mdb) {
2149 if (mdb->old) {
561f1103
HX		 2150 err = -EEXIST;
2151rollback:
2152 br->multicast_disabled = !!val;
2153 goto unlock;
2154 }
2155
e8051688 2156 err = br_mdb_rehash(&br->mdb, mdb->max,
561f1103
HX		 2157 br->hash_elasticity);
2158 if (err)
2159 goto rollback;
2160 }
2161
7cb3f921
NA		 2162 br_multicast_open(br);
2163 list_for_each_entry(port, &br->port_list, list)
2164 __br_multicast_enable_port(port);
561f1103
HX		 2165
2166unlock:
ef5e0d82 2167 spin_unlock_bh(&br->multicast_lock);
561f1103
HX		 2168
2169 return err;
2170}
b195167f 2171
c5c23260
HX		 2172int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2173{
b00589af
LL		 2174 unsigned long max_delay;
2175
c5c23260
HX		 2176 val = !!val;
2177
2178 spin_lock_bh(&br->multicast_lock);
2179 if (br->multicast_querier == val)
2180 goto unlock;
2181
2182 br->multicast_querier = val;
b00589af
LL		 2183 if (!val)
2184 goto unlock;
2185
2186 max_delay = br->multicast_query_response_interval;
b00589af 2187
90010b36
LL		 2188 if (!timer_pending(&br->ip4_other_query.timer))
2189 br->ip4_other_query.delay_time = jiffies + max_delay;
cc0fdd80 2190
90010b36 2191 br_multicast_start_querier(br, &br->ip4_own_query);
cc0fdd80
LL		 2192
2193#if IS_ENABLED(CONFIG_IPV6)
90010b36
LL		 2194 if (!timer_pending(&br->ip6_other_query.timer))
2195 br->ip6_other_query.delay_time = jiffies + max_delay;
cc0fdd80 2196
90010b36 2197 br_multicast_start_querier(br, &br->ip6_own_query);
cc0fdd80 2198#endif
c5c23260
HX		 2199
2200unlock:
2201 spin_unlock_bh(&br->multicast_lock);
2202
2203 return 0;
2204}
2205
b195167f
HX		 2206int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2207{
6ae4ae8e 2208 int err = -EINVAL;
b195167f 2209 u32 old;
e8051688 2210 struct net_bridge_mdb_htable *mdb;
b195167f 2211
fe0d692b 2212 spin_lock_bh(&br->multicast_lock);
b195167f
HX		 2213 if (!is_power_of_2(val))
2214 goto unlock;
e8051688
ED		 2215
2216 mdb = mlock_dereference(br->mdb, br);
2217 if (mdb && val < mdb->size)
b195167f
HX		 2218 goto unlock;
2219
2220 err = 0;
2221
2222 old = br->hash_max;
2223 br->hash_max = val;
2224
e8051688
ED		 2225 if (mdb) {
2226 if (mdb->old) {
b195167f
HX		 2227 err = -EEXIST;
2228rollback:
2229 br->hash_max = old;
2230 goto unlock;
2231 }
2232
2233 err = br_mdb_rehash(&br->mdb, br->hash_max,
2234 br->hash_elasticity);
2235 if (err)
2236 goto rollback;
2237 }
2238
2239unlock:
fe0d692b 2240 spin_unlock_bh(&br->multicast_lock);
b195167f
HX		 2241
2242 return err;
2243}
07f8ac4a 2244
5e923585
NA		 2245int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2246{
2247 /* Currently we support only version 2 and 3 */
2248 switch (val) {
2249 case 2:
2250 case 3:
2251 break;
2252 default:
2253 return -EINVAL;
2254 }
2255
2256 spin_lock_bh(&br->multicast_lock);
2257 br->multicast_igmp_version = val;
2258 spin_unlock_bh(&br->multicast_lock);
2259
2260 return 0;
2261}
2262
aa2ae3e7
NA		 2263#if IS_ENABLED(CONFIG_IPV6)
2264int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2265{
2266 /* Currently we support version 1 and 2 */
2267 switch (val) {
2268 case 1:
2269 case 2:
2270 break;
2271 default:
2272 return -EINVAL;
2273 }
2274
2275 spin_lock_bh(&br->multicast_lock);
2276 br->multicast_mld_version = val;
2277 spin_unlock_bh(&br->multicast_lock);
2278
2279 return 0;
2280}
2281#endif
2282
07f8ac4a
LL		 2283/**
2284 * br_multicast_list_adjacent - Returns snooped multicast addresses
2285 * @dev: The bridge port adjacent to which to retrieve addresses
2286 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2287 *
2288 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2289 * snooping feature on all bridge ports of dev's bridge device, excluding
2290 * the addresses from dev itself.
2291 *
2292 * Returns the number of items added to br_ip_list.
2293 *
2294 * Notes:
2295 * - br_ip_list needs to be initialized by caller
2296 * - br_ip_list might contain duplicates in the end
2297 * (needs to be taken care of by caller)
2298 * - br_ip_list needs to be freed by caller
2299 */
2300int br_multicast_list_adjacent(struct net_device *dev,
2301 struct list_head *br_ip_list)
2302{
2303 struct net_bridge *br;
2304 struct net_bridge_port *port;
2305 struct net_bridge_port_group *group;
2306 struct br_ip_list *entry;
2307 int count = 0;
2308
2309 rcu_read_lock();
2310 if (!br_ip_list || !br_port_exists(dev))
2311 goto unlock;
2312
2313 port = br_port_get_rcu(dev);
2314 if (!port || !port->br)
2315 goto unlock;
2316
2317 br = port->br;
2318
2319 list_for_each_entry_rcu(port, &br->port_list, list) {
2320 if (!port->dev || port->dev == dev)
2321 continue;
2322
2323 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2324 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2325 if (!entry)
2326 goto unlock;
2327
2328 entry->addr = group->addr;
2329 list_add(&entry->list, br_ip_list);
2330 count++;
2331 }
2332 }
2333
2334unlock:
2335 rcu_read_unlock();
2336 return count;
2337}
2338EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2cd41431 2339
c34963e2
LL		 2340/**
2341 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2342 * @dev: The bridge port providing the bridge on which to check for a querier
2343 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2344 *
2345 * Checks whether the given interface has a bridge on top and if so returns
2346 * true if a valid querier exists anywhere on the bridged link layer.
2347 * Otherwise returns false.
2348 */
2349bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2350{
2351 struct net_bridge *br;
2352 struct net_bridge_port *port;
2353 struct ethhdr eth;
2354 bool ret = false;
2355
2356 rcu_read_lock();
2357 if (!br_port_exists(dev))
2358 goto unlock;
2359
2360 port = br_port_get_rcu(dev);
2361 if (!port || !port->br)
2362 goto unlock;
2363
2364 br = port->br;
2365
2366 memset(&eth, 0, sizeof(eth));
2367 eth.h_proto = htons(proto);
2368
2369 ret = br_multicast_querier_exists(br, &eth);
2370
2371unlock:
2372 rcu_read_unlock();
2373 return ret;
2374}
2375EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2376
2cd41431
LL		 2377/**
2378 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2379 * @dev: The bridge port adjacent to which to check for a querier
2380 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2381 *
2382 * Checks whether the given interface has a bridge on top and if so returns
2383 * true if a selected querier is behind one of the other ports of this
2384 * bridge. Otherwise returns false.
2385 */
2386bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2387{
2388 struct net_bridge *br;
2389 struct net_bridge_port *port;
2390 bool ret = false;
2391
2392 rcu_read_lock();
2393 if (!br_port_exists(dev))
2394 goto unlock;
2395
2396 port = br_port_get_rcu(dev);
2397 if (!port || !port->br)
2398 goto unlock;
2399
2400 br = port->br;
2401
2402 switch (proto) {
2403 case ETH_P_IP:
2404 if (!timer_pending(&br->ip4_other_query.timer) ||
2405 rcu_dereference(br->ip4_querier.port) == port)
2406 goto unlock;
2407 break;
3993c4e1 2408#if IS_ENABLED(CONFIG_IPV6)
2cd41431
LL		 2409 case ETH_P_IPV6:
2410 if (!timer_pending(&br->ip6_other_query.timer) ||
2411 rcu_dereference(br->ip6_querier.port) == port)
2412 goto unlock;
2413 break;
3993c4e1 2414#endif
2cd41431
LL		 2415 default:
2416 goto unlock;
2417 }
2418
2419 ret = true;
2420unlock:
2421 rcu_read_unlock();
2422 return ret;
2423}
2424EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
1080ab95
NA		 2425
2426static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
a65056ec 2427 const struct sk_buff *skb, u8 type, u8 dir)
1080ab95
NA		 2428{
2429 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
a65056ec
NA		 2430 __be16 proto = skb->protocol;
2431 unsigned int t_len;
1080ab95
NA		 2432
2433 u64_stats_update_begin(&pstats->syncp);
2434 switch (proto) {
2435 case htons(ETH_P_IP):
a65056ec 2436 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
1080ab95
NA		 2437 switch (type) {
2438 case IGMP_HOST_MEMBERSHIP_REPORT:
2439 pstats->mstats.igmp_v1reports[dir]++;
2440 break;
2441 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2442 pstats->mstats.igmp_v2reports[dir]++;
2443 break;
2444 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2445 pstats->mstats.igmp_v3reports[dir]++;
2446 break;
2447 case IGMP_HOST_MEMBERSHIP_QUERY:
a65056ec
NA		 2448 if (t_len != sizeof(struct igmphdr)) {
2449 pstats->mstats.igmp_v3queries[dir]++;
2450 } else {
2451 unsigned int offset = skb_transport_offset(skb);
2452 struct igmphdr *ih, _ihdr;
2453
2454 ih = skb_header_pointer(skb, offset,
2455 sizeof(_ihdr), &_ihdr);
2456 if (!ih)
2457 break;
2458 if (!ih->code)
2459 pstats->mstats.igmp_v1queries[dir]++;
2460 else
2461 pstats->mstats.igmp_v2queries[dir]++;
2462 }
1080ab95
NA		 2463 break;
2464 case IGMP_HOST_LEAVE_MESSAGE:
2465 pstats->mstats.igmp_leaves[dir]++;
2466 break;
2467 }
2468 break;
2469#if IS_ENABLED(CONFIG_IPV6)
2470 case htons(ETH_P_IPV6):
a65056ec
NA		 2471 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2472 sizeof(struct ipv6hdr);
2473 t_len -= skb_network_header_len(skb);
1080ab95
NA		 2474 switch (type) {
2475 case ICMPV6_MGM_REPORT:
2476 pstats->mstats.mld_v1reports[dir]++;
2477 break;
2478 case ICMPV6_MLD2_REPORT:
2479 pstats->mstats.mld_v2reports[dir]++;
2480 break;
2481 case ICMPV6_MGM_QUERY:
a65056ec
NA		 2482 if (t_len != sizeof(struct mld_msg))
2483 pstats->mstats.mld_v2queries[dir]++;
2484 else
2485 pstats->mstats.mld_v1queries[dir]++;
1080ab95
NA		 2486 break;
2487 case ICMPV6_MGM_REDUCTION:
2488 pstats->mstats.mld_leaves[dir]++;
2489 break;
2490 }
2491 break;
2492#endif /* CONFIG_IPV6 */
2493 }
2494 u64_stats_update_end(&pstats->syncp);
2495}
2496
2497void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
a65056ec 2498 const struct sk_buff *skb, u8 type, u8 dir)
1080ab95
NA		 2499{
2500 struct bridge_mcast_stats __percpu *stats;
2501
2502 /* if multicast_disabled is true then igmp type can't be set */
2503 if (!type || !br->multicast_stats_enabled)
2504 return;
2505
2506 if (p)
2507 stats = p->mcast_stats;
2508 else
2509 stats = br->mcast_stats;
2510 if (WARN_ON(!stats))
2511 return;
2512
a65056ec 2513 br_mcast_stats_add(stats, skb, type, dir);
1080ab95
NA		 2514}
2515
2516int br_multicast_init_stats(struct net_bridge *br)
2517{
2518 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2519 if (!br->mcast_stats)
2520 return -ENOMEM;
2521
2522 return 0;
2523}
2524
2525static void mcast_stats_add_dir(u64 *dst, u64 *src)
2526{
2527 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2528 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2529}
2530
2531void br_multicast_get_stats(const struct net_bridge *br,
2532 const struct net_bridge_port *p,
2533 struct br_mcast_stats *dest)
2534{
2535 struct bridge_mcast_stats __percpu *stats;
2536 struct br_mcast_stats tdst;
2537 int i;
2538
2539 memset(dest, 0, sizeof(*dest));
2540 if (p)
2541 stats = p->mcast_stats;
2542 else
2543 stats = br->mcast_stats;
2544 if (WARN_ON(!stats))
2545 return;
2546
2547 memset(&tdst, 0, sizeof(tdst));
2548 for_each_possible_cpu(i) {
2549 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2550 struct br_mcast_stats temp;
2551 unsigned int start;
2552
2553 do {
2554 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2555 memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2556 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2557
a65056ec
NA		 2558 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2559 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2560 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
1080ab95
NA		 2561 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2562 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2563 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2564 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2565 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2566
a65056ec
NA		 2567 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2568 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
1080ab95
NA		 2569 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2570 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2571 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2572 tdst.mld_parse_errors += temp.mld_parse_errors;
2573 }
2574 memcpy(dest, &tdst, sizeof(*dest));
2575}
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git