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bridge: Export VLAN filtering state
[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
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
242static void br_multicast_group_expired(unsigned long data)
243{
244 struct net_bridge_mdb_entry *mp = (void *)data;
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
8a870178 252 mp->mglist = false;
eb1d1641
HX		 253
254 if (mp->ports)
255 goto out;
256
e8051688
ED		 257 mdb = mlock_dereference(br->mdb, br);
258
eb1d1641
HX		 259 hlist_del_rcu(&mp->hlist[mdb->ver]);
260 mdb->size--;
261
eb1d1641
HX		 262 call_rcu_bh(&mp->rcu, br_multicast_free_group);
263
264out:
265 spin_unlock(&br->multicast_lock);
266}
267
268static void br_multicast_del_pg(struct net_bridge *br,
269 struct net_bridge_port_group *pg)
270{
e8051688 271 struct net_bridge_mdb_htable *mdb;
eb1d1641
HX		 272 struct net_bridge_mdb_entry *mp;
273 struct net_bridge_port_group *p;
e8051688
ED		 274 struct net_bridge_port_group __rcu **pp;
275
276 mdb = mlock_dereference(br->mdb, br);
eb1d1641 277
8ef2a9a5 278 mp = br_mdb_ip_get(mdb, &pg->addr);
eb1d1641
HX		 279 if (WARN_ON(!mp))
280 return;
281
e8051688
ED		 282 for (pp = &mp->ports;
283 (p = mlock_dereference(*pp, br)) != NULL;
284 pp = &p->next) {
eb1d1641
HX		 285 if (p != pg)
286 continue;
287
83f6a740 288 rcu_assign_pointer(*pp, p->next);
eb1d1641
HX		 289 hlist_del_init(&p->mglist);
290 del_timer(&p->timer);
45ebcce5
ER		 291 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
292 p->flags);
eb1d1641
HX		 293 call_rcu_bh(&p->rcu, br_multicast_free_pg);
294
454594f3 295 if (!mp->ports && !mp->mglist &&
eb1d1641
HX		 296 netif_running(br->dev))
297 mod_timer(&mp->timer, jiffies);
298
299 return;
300 }
301
302 WARN_ON(1);
303}
304
305static void br_multicast_port_group_expired(unsigned long data)
306{
307 struct net_bridge_port_group *pg = (void *)data;
308 struct net_bridge *br = pg->port->br;
309
310 spin_lock(&br->multicast_lock);
311 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
9d06b6d8 312 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
eb1d1641
HX		 313 goto out;
314
315 br_multicast_del_pg(br, pg);
316
317out:
318 spin_unlock(&br->multicast_lock);
319}
320
e8051688 321static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
eb1d1641
HX		 322 int elasticity)
323{
e8051688 324 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
eb1d1641
HX		 325 struct net_bridge_mdb_htable *mdb;
326 int err;
327
328 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
329 if (!mdb)
330 return -ENOMEM;
331
332 mdb->max = max;
333 mdb->old = old;
334
335 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
336 if (!mdb->mhash) {
337 kfree(mdb);
338 return -ENOMEM;
339 }
340
341 mdb->size = old ? old->size : 0;
342 mdb->ver = old ? old->ver ^ 1 : 0;
343
344 if (!old || elasticity)
345 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
346 else
347 mdb->secret = old->secret;
348
349 if (!old)
350 goto out;
351
352 err = br_mdb_copy(mdb, old, elasticity);
353 if (err) {
354 kfree(mdb->mhash);
355 kfree(mdb);
356 return err;
357 }
358
2ce297fc 359 br_mdb_rehash_seq++;
eb1d1641
HX		 360 call_rcu_bh(&mdb->rcu, br_mdb_free);
361
362out:
363 rcu_assign_pointer(*mdbp, mdb);
364
365 return 0;
366}
367
8ef2a9a5 368static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
1080ab95
NA		 369 __be32 group,
370 u8 *igmp_type)
eb1d1641 371{
5e923585
NA		 372 struct igmpv3_query *ihv3;
373 size_t igmp_hdr_size;
eb1d1641
HX		 374 struct sk_buff *skb;
375 struct igmphdr *ih;
376 struct ethhdr *eth;
377 struct iphdr *iph;
378
5e923585
NA		 379 igmp_hdr_size = sizeof(*ih);
380 if (br->multicast_igmp_version == 3)
381 igmp_hdr_size = sizeof(*ihv3);
eb1d1641 382 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
5e923585 383 igmp_hdr_size + 4);
eb1d1641
HX		 384 if (!skb)
385 goto out;
386
387 skb->protocol = htons(ETH_P_IP);
388
389 skb_reset_mac_header(skb);
390 eth = eth_hdr(skb);
391
e5a727f6 392 ether_addr_copy(eth->h_source, br->dev->dev_addr);
eb1d1641
HX		 393 eth->h_dest[0] = 1;
394 eth->h_dest[1] = 0;
395 eth->h_dest[2] = 0x5e;
396 eth->h_dest[3] = 0;
397 eth->h_dest[4] = 0;
398 eth->h_dest[5] = 1;
399 eth->h_proto = htons(ETH_P_IP);
400 skb_put(skb, sizeof(*eth));
401
402 skb_set_network_header(skb, skb->len);
403 iph = ip_hdr(skb);
404
405 iph->version = 4;
406 iph->ihl = 6;
407 iph->tos = 0xc0;
5e923585 408 iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4);
eb1d1641
HX		 409 iph->id = 0;
410 iph->frag_off = htons(IP_DF);
411 iph->ttl = 1;
412 iph->protocol = IPPROTO_IGMP;
1c8ad5bf
CW		 413 iph->saddr = br->multicast_query_use_ifaddr ?
414 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
eb1d1641
HX		 415 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
416 ((u8 *)&iph[1])[0] = IPOPT_RA;
417 ((u8 *)&iph[1])[1] = 4;
418 ((u8 *)&iph[1])[2] = 0;
419 ((u8 *)&iph[1])[3] = 0;
420 ip_send_check(iph);
421 skb_put(skb, 24);
422
423 skb_set_transport_header(skb, skb->len);
1080ab95 424 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
eb1d1641 425
5e923585
NA		 426 switch (br->multicast_igmp_version) {
427 case 2:
428 ih = igmp_hdr(skb);
429 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
430 ih->code = (group ? br->multicast_last_member_interval :
431 br->multicast_query_response_interval) /
432 (HZ / IGMP_TIMER_SCALE);
433 ih->group = group;
434 ih->csum = 0;
435 ih->csum = ip_compute_csum((void *)ih, sizeof(*ih));
436 break;
437 case 3:
438 ihv3 = igmpv3_query_hdr(skb);
439 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
440 ihv3->code = (group ? br->multicast_last_member_interval :
441 br->multicast_query_response_interval) /
442 (HZ / IGMP_TIMER_SCALE);
443 ihv3->group = group;
444 ihv3->qqic = br->multicast_query_interval / HZ;
445 ihv3->nsrcs = 0;
446 ihv3->resv = 0;
447 ihv3->suppress = 0;
448 ihv3->qrv = 2;
449 ihv3->csum = 0;
450 ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3));
451 break;
452 }
453
454 skb_put(skb, igmp_hdr_size);
eb1d1641
HX		 455 __skb_pull(skb, sizeof(*eth));
456
457out:
458 return skb;
459}
460
dfd56b8b 461#if IS_ENABLED(CONFIG_IPV6)
08b202b6 462static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
1080ab95
NA		 463 const struct in6_addr *grp,
464 u8 *igmp_type)
08b202b6 465{
aa2ae3e7
NA		 466 struct mld2_query *mld2q;
467 unsigned long interval;
08b202b6
YH		 468 struct ipv6hdr *ip6h;
469 struct mld_msg *mldq;
aa2ae3e7
NA		 470 size_t mld_hdr_size;
471 struct sk_buff *skb;
08b202b6
YH		 472 struct ethhdr *eth;
473 u8 *hopopt;
08b202b6 474
aa2ae3e7
NA		 475 mld_hdr_size = sizeof(*mldq);
476 if (br->multicast_mld_version == 2)
477 mld_hdr_size = sizeof(*mld2q);
08b202b6 478 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
aa2ae3e7 479 8 + mld_hdr_size);
08b202b6
YH		 480 if (!skb)
481 goto out;
482
483 skb->protocol = htons(ETH_P_IPV6);
484
485 /* Ethernet header */
486 skb_reset_mac_header(skb);
487 eth = eth_hdr(skb);
488
e5a727f6 489 ether_addr_copy(eth->h_source, br->dev->dev_addr);
08b202b6
YH		 490 eth->h_proto = htons(ETH_P_IPV6);
491 skb_put(skb, sizeof(*eth));
492
493 /* IPv6 header + HbH option */
494 skb_set_network_header(skb, skb->len);
495 ip6h = ipv6_hdr(skb);
496
497 *(__force __be32 *)ip6h = htonl(0x60000000);
aa2ae3e7 498 ip6h->payload_len = htons(8 + mld_hdr_size);
08b202b6
YH		 499 ip6h->nexthdr = IPPROTO_HOPOPTS;
500 ip6h->hop_limit = 1;
a7bff75b 501 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
d1d81d4c
UW		 502 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
503 &ip6h->saddr)) {
504 kfree_skb(skb);
0888d5f3 505 br->has_ipv6_addr = 0;
d1d81d4c
UW		 506 return NULL;
507 }
0888d5f3 508
509 br->has_ipv6_addr = 1;
36cff5a1 510 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
08b202b6
YH		 511
512 hopopt = (u8 *)(ip6h + 1);
513 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
514 hopopt[1] = 0; /* length of HbH */
515 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
516 hopopt[3] = 2; /* Length of RA Option */
517 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
518 hopopt[5] = 0;
1de5a71c
EZ		 519 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
520 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
08b202b6
YH		 521
522 skb_put(skb, sizeof(*ip6h) + 8);
523
524 /* ICMPv6 */
525 skb_set_transport_header(skb, skb->len);
1080ab95 526 interval = ipv6_addr_any(grp) ?
32de868c
LL		 527 br->multicast_query_response_interval :
528 br->multicast_last_member_interval;
1080ab95 529 *igmp_type = ICMPV6_MGM_QUERY;
aa2ae3e7
NA		 530 switch (br->multicast_mld_version) {
531 case 1:
532 mldq = (struct mld_msg *)icmp6_hdr(skb);
533 mldq->mld_type = ICMPV6_MGM_QUERY;
534 mldq->mld_code = 0;
535 mldq->mld_cksum = 0;
536 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
537 mldq->mld_reserved = 0;
538 mldq->mld_mca = *grp;
539 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
540 sizeof(*mldq), IPPROTO_ICMPV6,
541 csum_partial(mldq,
542 sizeof(*mldq),
543 0));
544 break;
545 case 2:
546 mld2q = (struct mld2_query *)icmp6_hdr(skb);
53631a5f 547 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
aa2ae3e7
NA		 548 mld2q->mld2q_type = ICMPV6_MGM_QUERY;
549 mld2q->mld2q_code = 0;
550 mld2q->mld2q_cksum = 0;
551 mld2q->mld2q_resv1 = 0;
552 mld2q->mld2q_resv2 = 0;
553 mld2q->mld2q_suppress = 0;
554 mld2q->mld2q_qrv = 2;
555 mld2q->mld2q_nsrcs = 0;
556 mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
557 mld2q->mld2q_mca = *grp;
558 mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
559 sizeof(*mld2q),
560 IPPROTO_ICMPV6,
561 csum_partial(mld2q,
562 sizeof(*mld2q),
563 0));
564 break;
565 }
566 skb_put(skb, mld_hdr_size);
08b202b6
YH		 567
568 __skb_pull(skb, sizeof(*eth));
569
570out:
571 return skb;
572}
573#endif
574
8ef2a9a5 575static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
1080ab95
NA		 576 struct br_ip *addr,
577 u8 *igmp_type)
8ef2a9a5
YH		 578{
579 switch (addr->proto) {
580 case htons(ETH_P_IP):
1080ab95 581 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
dfd56b8b 582#if IS_ENABLED(CONFIG_IPV6)
08b202b6 583 case htons(ETH_P_IPV6):
1080ab95
NA		 584 return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
585 igmp_type);
08b202b6 586#endif
8ef2a9a5
YH		 587 }
588 return NULL;
589}
590
eb1d1641 591static struct net_bridge_mdb_entry *br_multicast_get_group(
8ef2a9a5
YH		 592 struct net_bridge *br, struct net_bridge_port *port,
593 struct br_ip *group, int hash)
eb1d1641 594{
e8051688 595 struct net_bridge_mdb_htable *mdb;
eb1d1641 596 struct net_bridge_mdb_entry *mp;
95c96174
ED		 597 unsigned int count = 0;
598 unsigned int max;
eb1d1641
HX		 599 int elasticity;
600 int err;
601
e8051688 602 mdb = rcu_dereference_protected(br->mdb, 1);
b67bfe0d 603 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
eb1d1641 604 count++;
8ef2a9a5 605 if (unlikely(br_ip_equal(group, &mp->addr)))
eb1d1641 606 return mp;
eb1d1641
HX		 607 }
608
609 elasticity = 0;
610 max = mdb->max;
611
612 if (unlikely(count > br->hash_elasticity && count)) {
613 if (net_ratelimit())
28a16c97 614 br_info(br, "Multicast hash table "
615 "chain limit reached: %s\n",
616 port ? port->dev->name : br->dev->name);
eb1d1641
HX		 617
618 elasticity = br->hash_elasticity;
619 }
620
621 if (mdb->size >= max) {
622 max *= 2;
036be6db
TG		 623 if (unlikely(max > br->hash_max)) {
624 br_warn(br, "Multicast hash table maximum of %d "
625 "reached, disabling snooping: %s\n",
626 br->hash_max,
627 port ? port->dev->name : br->dev->name);
eb1d1641
HX		 628 err = -E2BIG;
629disable:
630 br->multicast_disabled = 1;
631 goto err;
632 }
633 }
634
635 if (max > mdb->max || elasticity) {
636 if (mdb->old) {
637 if (net_ratelimit())
28a16c97 638 br_info(br, "Multicast hash table "
639 "on fire: %s\n",
640 port ? port->dev->name : br->dev->name);
eb1d1641
HX		 641 err = -EEXIST;
642 goto err;
643 }
644
645 err = br_mdb_rehash(&br->mdb, max, elasticity);
646 if (err) {
28a16c97 647 br_warn(br, "Cannot rehash multicast "
648 "hash table, disabling snooping: %s, %d, %d\n",
649 port ? port->dev->name : br->dev->name,
650 mdb->size, err);
eb1d1641
HX		 651 goto disable;
652 }
653
654 err = -EAGAIN;
655 goto err;
656 }
657
658 return NULL;
659
660err:
661 mp = ERR_PTR(err);
662 return mp;
663}
664
cfd56754 665struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
5e923585
NA		 666 struct net_bridge_port *p,
667 struct br_ip *group)
eb1d1641 668{
e8051688 669 struct net_bridge_mdb_htable *mdb;
eb1d1641
HX		 670 struct net_bridge_mdb_entry *mp;
671 int hash;
4c0833bc 672 int err;
eb1d1641 673
e8051688 674 mdb = rcu_dereference_protected(br->mdb, 1);
eb1d1641 675 if (!mdb) {
4c0833bc
TK		 676 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
677 if (err)
678 return ERR_PTR(err);
eb1d1641
HX		 679 goto rehash;
680 }
681
682 hash = br_ip_hash(mdb, group);
5e923585 683 mp = br_multicast_get_group(br, p, group, hash);
eb1d1641
HX		 684 switch (PTR_ERR(mp)) {
685 case 0:
686 break;
687
688 case -EAGAIN:
689rehash:
e8051688 690 mdb = rcu_dereference_protected(br->mdb, 1);
eb1d1641
HX		 691 hash = br_ip_hash(mdb, group);
692 break;
693
694 default:
695 goto out;
696 }
697
698 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
699 if (unlikely(!mp))
4c0833bc 700 return ERR_PTR(-ENOMEM);
eb1d1641
HX		 701
702 mp->br = br;
8ef2a9a5 703 mp->addr = *group;
1faabf2a
ED		 704 setup_timer(&mp->timer, br_multicast_group_expired,
705 (unsigned long)mp);
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
CW		 731 hlist_add_head(&p->mglist, &port->mglist);
732 setup_timer(&p->timer, br_multicast_port_group_expired,
733 (unsigned long)p);
6db6f0ea
FF		 734
735 if (src)
736 memcpy(p->eth_addr, src, ETH_ALEN);
737 else
738 memset(p->eth_addr, 0xff, ETH_ALEN);
739
cfd56754
CW		 740 return p;
741}
742
6db6f0ea
FF		 743static bool br_port_group_equal(struct net_bridge_port_group *p,
744 struct net_bridge_port *port,
745 const unsigned char *src)
746{
747 if (p->port != port)
748 return false;
749
750 if (!(port->flags & BR_MULTICAST_TO_UNICAST))
751 return true;
752
753 return ether_addr_equal(src, p->eth_addr);
754}
755
eb1d1641 756static int br_multicast_add_group(struct net_bridge *br,
8ef2a9a5 757 struct net_bridge_port *port,
6db6f0ea
FF		 758 struct br_ip *group,
759 const unsigned char *src)
eb1d1641 760{
e8051688 761 struct net_bridge_port_group __rcu **pp;
5e923585
NA		 762 struct net_bridge_port_group *p;
763 struct net_bridge_mdb_entry *mp;
454594f3 764 unsigned long now = jiffies;
eb1d1641
HX		 765 int err;
766
eb1d1641
HX		 767 spin_lock(&br->multicast_lock);
768 if (!netif_running(br->dev) ||
769 (port && port->state == BR_STATE_DISABLED))
770 goto out;
771
772 mp = br_multicast_new_group(br, port, group);
773 err = PTR_ERR(mp);
4c0833bc 774 if (IS_ERR(mp))
eb1d1641
HX		 775 goto err;
776
777 if (!port) {
8a870178 778 mp->mglist = true;
454594f3 779 mod_timer(&mp->timer, now + br->multicast_membership_interval);
eb1d1641
HX		 780 goto out;
781 }
782
e8051688
ED		 783 for (pp = &mp->ports;
784 (p = mlock_dereference(*pp, br)) != NULL;
785 pp = &p->next) {
6db6f0ea 786 if (br_port_group_equal(p, port, src))
454594f3 787 goto found;
eb1d1641
HX		 788 if ((unsigned long)p->port < (unsigned long)port)
789 break;
790 }
791
6db6f0ea 792 p = br_multicast_new_port_group(port, group, *pp, 0, src);
eb1d1641
HX		 793 if (unlikely(!p))
794 goto err;
eb1d1641 795 rcu_assign_pointer(*pp, p);
45ebcce5 796 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
eb1d1641 797
454594f3
LL		 798found:
799 mod_timer(&p->timer, now + br->multicast_membership_interval);
eb1d1641
HX		 800out:
801 err = 0;
802
803err:
804 spin_unlock(&br->multicast_lock);
805 return err;
806}
807
8ef2a9a5
YH		 808static int br_ip4_multicast_add_group(struct net_bridge *br,
809 struct net_bridge_port *port,
b0e9a30d 810 __be32 group,
6db6f0ea
FF		 811 __u16 vid,
812 const unsigned char *src)
8ef2a9a5
YH		 813{
814 struct br_ip br_group;
815
816 if (ipv4_is_local_multicast(group))
817 return 0;
818
819 br_group.u.ip4 = group;
820 br_group.proto = htons(ETH_P_IP);
b0e9a30d 821 br_group.vid = vid;
8ef2a9a5 822
6db6f0ea 823 return br_multicast_add_group(br, port, &br_group, src);
8ef2a9a5
YH		 824}
825
dfd56b8b 826#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 827static int br_ip6_multicast_add_group(struct net_bridge *br,
828 struct net_bridge_port *port,
b0e9a30d 829 const struct in6_addr *group,
6db6f0ea
FF		 830 __u16 vid,
831 const unsigned char *src)
08b202b6
YH		 832{
833 struct br_ip br_group;
834
3c3769e6 835 if (ipv6_addr_is_ll_all_nodes(group))
08b202b6
YH		 836 return 0;
837
4e3fd7a0 838 br_group.u.ip6 = *group;
9cc6e0c4 839 br_group.proto = htons(ETH_P_IPV6);
b0e9a30d 840 br_group.vid = vid;
08b202b6 841
6db6f0ea 842 return br_multicast_add_group(br, port, &br_group, src);
08b202b6
YH		 843}
844#endif
845
eb1d1641
HX		 846static void br_multicast_router_expired(unsigned long data)
847{
848 struct net_bridge_port *port = (void *)data;
849 struct net_bridge *br = port->br;
850
851 spin_lock(&br->multicast_lock);
a55d8246
NA		 852 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
853 port->multicast_router == MDB_RTR_TYPE_PERM ||
f12e7d95 854 timer_pending(&port->multicast_router_timer))
eb1d1641
HX		 855 goto out;
856
f12e7d95 857 __del_port_router(port);
eb1d1641
HX		 858out:
859 spin_unlock(&br->multicast_lock);
860}
861
862static void br_multicast_local_router_expired(unsigned long data)
863{
864}
865
cc0fdd80 866static void br_multicast_querier_expired(struct net_bridge *br,
90010b36 867 struct bridge_mcast_own_query *query)
c83b8fab 868{
c83b8fab
HX		 869 spin_lock(&br->multicast_lock);
870 if (!netif_running(br->dev) || br->multicast_disabled)
871 goto out;
872
cc0fdd80 873 br_multicast_start_querier(br, query);
c83b8fab
HX		 874
875out:
876 spin_unlock(&br->multicast_lock);
877}
878
cc0fdd80
LL		 879static void br_ip4_multicast_querier_expired(unsigned long data)
880{
881 struct net_bridge *br = (void *)data;
882
90010b36 883 br_multicast_querier_expired(br, &br->ip4_own_query);
cc0fdd80
LL		 884}
885
886#if IS_ENABLED(CONFIG_IPV6)
887static void br_ip6_multicast_querier_expired(unsigned long data)
888{
889 struct net_bridge *br = (void *)data;
890
90010b36 891 br_multicast_querier_expired(br, &br->ip6_own_query);
cc0fdd80
LL		 892}
893#endif
894
dc4eb53a
LL		 895static void br_multicast_select_own_querier(struct net_bridge *br,
896 struct br_ip *ip,
897 struct sk_buff *skb)
898{
899 if (ip->proto == htons(ETH_P_IP))
900 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
901#if IS_ENABLED(CONFIG_IPV6)
902 else
903 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
904#endif
905}
906
8ef2a9a5
YH		 907static void __br_multicast_send_query(struct net_bridge *br,
908 struct net_bridge_port *port,
909 struct br_ip *ip)
eb1d1641 910{
eb1d1641 911 struct sk_buff *skb;
1080ab95 912 u8 igmp_type;
eb1d1641 913
1080ab95 914 skb = br_multicast_alloc_query(br, ip, &igmp_type);
eb1d1641 915 if (!skb)
8ef2a9a5 916 return;
eb1d1641
HX		 917
918 if (port) {
eb1d1641 919 skb->dev = port->dev;
a65056ec 920 br_multicast_count(br, port, skb, igmp_type,
1080ab95 921 BR_MCAST_DIR_TX);
29a26a56
EB		 922 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
923 dev_net(port->dev), NULL, skb, NULL, skb->dev,
f0b4eece 924 br_dev_queue_push_xmit);
dc4eb53a
LL		 925 } else {
926 br_multicast_select_own_querier(br, ip, skb);
a65056ec 927 br_multicast_count(br, port, skb, igmp_type,
1080ab95 928 BR_MCAST_DIR_RX);
eb1d1641 929 netif_rx(skb);
dc4eb53a 930 }
8ef2a9a5
YH		 931}
932
933static void br_multicast_send_query(struct net_bridge *br,
cc0fdd80 934 struct net_bridge_port *port,
90010b36 935 struct bridge_mcast_own_query *own_query)
8ef2a9a5 936{
90010b36 937 struct bridge_mcast_other_query *other_query = NULL;
5e923585
NA		 938 struct br_ip br_group;
939 unsigned long time;
8ef2a9a5
YH		 940
941 if (!netif_running(br->dev) || br->multicast_disabled ||
cc0fdd80 942 !br->multicast_querier)
8ef2a9a5
YH		 943 return;
944
08b202b6
YH		 945 memset(&br_group.u, 0, sizeof(br_group.u));
946
90010b36
LL		 947 if (port ? (own_query == &port->ip4_own_query) :
948 (own_query == &br->ip4_own_query)) {
949 other_query = &br->ip4_other_query;
cc0fdd80 950 br_group.proto = htons(ETH_P_IP);
dfd56b8b 951#if IS_ENABLED(CONFIG_IPV6)
cc0fdd80 952 } else {
90010b36 953 other_query = &br->ip6_other_query;
cc0fdd80 954 br_group.proto = htons(ETH_P_IPV6);
08b202b6 955#endif
cc0fdd80
LL		 956 }
957
90010b36 958 if (!other_query || timer_pending(&other_query->timer))
cc0fdd80
LL		 959 return;
960
961 __br_multicast_send_query(br, port, &br_group);
eb1d1641 962
eb1d1641 963 time = jiffies;
90010b36 964 time += own_query->startup_sent < br->multicast_startup_query_count ?
eb1d1641
HX		 965 br->multicast_startup_query_interval :
966 br->multicast_query_interval;
90010b36 967 mod_timer(&own_query->timer, time);
eb1d1641
HX		 968}
969
90010b36
LL		 970static void
971br_multicast_port_query_expired(struct net_bridge_port *port,
972 struct bridge_mcast_own_query *query)
eb1d1641 973{
eb1d1641
HX		 974 struct net_bridge *br = port->br;
975
976 spin_lock(&br->multicast_lock);
02a780c0
DC		 977 if (port->state == BR_STATE_DISABLED ||
978 port->state == BR_STATE_BLOCKING)
eb1d1641
HX		 979 goto out;
980
cc0fdd80
LL		 981 if (query->startup_sent < br->multicast_startup_query_count)
982 query->startup_sent++;
eb1d1641 983
cc0fdd80 984 br_multicast_send_query(port->br, port, query);
eb1d1641
HX		 985
986out:
987 spin_unlock(&br->multicast_lock);
988}
989
cc0fdd80
LL		 990static void br_ip4_multicast_port_query_expired(unsigned long data)
991{
992 struct net_bridge_port *port = (void *)data;
993
90010b36 994 br_multicast_port_query_expired(port, &port->ip4_own_query);
cc0fdd80
LL		 995}
996
997#if IS_ENABLED(CONFIG_IPV6)
998static void br_ip6_multicast_port_query_expired(unsigned long data)
999{
1000 struct net_bridge_port *port = (void *)data;
1001
90010b36 1002 br_multicast_port_query_expired(port, &port->ip6_own_query);
cc0fdd80
LL		 1003}
1004#endif
1005
147c1e9b
NF		 1006static void br_mc_disabled_update(struct net_device *dev, bool value)
1007{
1008 struct switchdev_attr attr = {
1009 .orig_dev = dev,
1010 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
1011 .flags = SWITCHDEV_F_DEFER,
1012 .u.mc_disabled = value,
1013 };
1014
1015 switchdev_port_attr_set(dev, &attr);
1016}
1017
1080ab95 1018int br_multicast_add_port(struct net_bridge_port *port)
eb1d1641 1019{
7f0aec7a 1020 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
eb1d1641
HX		 1021
1022 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
1023 (unsigned long)port);
90010b36
LL		 1024 setup_timer(&port->ip4_own_query.timer,
1025 br_ip4_multicast_port_query_expired, (unsigned long)port);
cc0fdd80 1026#if IS_ENABLED(CONFIG_IPV6)
90010b36
LL		 1027 setup_timer(&port->ip6_own_query.timer,
1028 br_ip6_multicast_port_query_expired, (unsigned long)port);
cc0fdd80 1029#endif
147c1e9b
NF		 1030 br_mc_disabled_update(port->dev, port->br->multicast_disabled);
1031
1080ab95
NA		 1032 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
1033 if (!port->mcast_stats)
1034 return -ENOMEM;
1035
1036 return 0;
eb1d1641
HX		 1037}
1038
1039void br_multicast_del_port(struct net_bridge_port *port)
1040{
e10177ab
SA		 1041 struct net_bridge *br = port->br;
1042 struct net_bridge_port_group *pg;
1043 struct hlist_node *n;
1044
1045 /* Take care of the remaining groups, only perm ones should be left */
1046 spin_lock_bh(&br->multicast_lock);
1047 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1048 br_multicast_del_pg(br, pg);
1049 spin_unlock_bh(&br->multicast_lock);
eb1d1641 1050 del_timer_sync(&port->multicast_router_timer);
1080ab95 1051 free_percpu(port->mcast_stats);
eb1d1641
HX		 1052}
1053
90010b36 1054static void br_multicast_enable(struct bridge_mcast_own_query *query)
561f1103 1055{
cc0fdd80 1056 query->startup_sent = 0;
561f1103 1057
cc0fdd80
LL		 1058 if (try_to_del_timer_sync(&query->timer) >= 0 ||
1059 del_timer(&query->timer))
1060 mod_timer(&query->timer, jiffies);
561f1103
HX		 1061}
1062
7cb3f921 1063static void __br_multicast_enable_port(struct net_bridge_port *port)
eb1d1641
HX		 1064{
1065 struct net_bridge *br = port->br;
1066
eb1d1641 1067 if (br->multicast_disabled || !netif_running(br->dev))
7cb3f921 1068 return;
eb1d1641 1069
90010b36 1070 br_multicast_enable(&port->ip4_own_query);
cc0fdd80 1071#if IS_ENABLED(CONFIG_IPV6)
90010b36 1072 br_multicast_enable(&port->ip6_own_query);
cc0fdd80 1073#endif
7f0aec7a
NA		 1074 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
1075 hlist_unhashed(&port->rlist))
754bc547 1076 br_multicast_add_router(br, port);
7cb3f921 1077}
eb1d1641 1078
7cb3f921
NA		 1079void br_multicast_enable_port(struct net_bridge_port *port)
1080{
1081 struct net_bridge *br = port->br;
1082
1083 spin_lock(&br->multicast_lock);
1084 __br_multicast_enable_port(port);
eb1d1641
HX		 1085 spin_unlock(&br->multicast_lock);
1086}
1087
1088void br_multicast_disable_port(struct net_bridge_port *port)
1089{
1090 struct net_bridge *br = port->br;
1091 struct net_bridge_port_group *pg;
b67bfe0d 1092 struct hlist_node *n;
eb1d1641
HX		 1093
1094 spin_lock(&br->multicast_lock);
b67bfe0d 1095 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
9d06b6d8 1096 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
e10177ab 1097 br_multicast_del_pg(br, pg);
eb1d1641 1098
f12e7d95
NF		 1099 __del_port_router(port);
1100
eb1d1641 1101 del_timer(&port->multicast_router_timer);
90010b36 1102 del_timer(&port->ip4_own_query.timer);
cc0fdd80 1103#if IS_ENABLED(CONFIG_IPV6)
90010b36 1104 del_timer(&port->ip6_own_query.timer);
cc0fdd80 1105#endif
eb1d1641
HX		 1106 spin_unlock(&br->multicast_lock);
1107}
1108
8ef2a9a5
YH		 1109static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1110 struct net_bridge_port *port,
06499098
VY		 1111 struct sk_buff *skb,
1112 u16 vid)
eb1d1641 1113{
6db6f0ea 1114 const unsigned char *src;
eb1d1641
HX		 1115 struct igmpv3_report *ih;
1116 struct igmpv3_grec *grec;
1117 int i;
1118 int len;
1119 int num;
1120 int type;
1121 int err = 0;
1122 __be32 group;
1123
eb1d1641
HX		 1124 ih = igmpv3_report_hdr(skb);
1125 num = ntohs(ih->ngrec);
c2d4fbd2 1126 len = skb_transport_offset(skb) + sizeof(*ih);
eb1d1641
HX		 1127
1128 for (i = 0; i < num; i++) {
1129 len += sizeof(*grec);
1130 if (!pskb_may_pull(skb, len))
1131 return -EINVAL;
1132
fd218cf9 1133 grec = (void *)(skb->data + len - sizeof(*grec));
eb1d1641
HX		 1134 group = grec->grec_mca;
1135 type = grec->grec_type;
1136
8eabf95c 1137 len += ntohs(grec->grec_nsrcs) * 4;
eb1d1641
HX		 1138 if (!pskb_may_pull(skb, len))
1139 return -EINVAL;
1140
1141 /* We treat this as an IGMPv2 report for now. */
1142 switch (type) {
1143 case IGMPV3_MODE_IS_INCLUDE:
1144 case IGMPV3_MODE_IS_EXCLUDE:
1145 case IGMPV3_CHANGE_TO_INCLUDE:
1146 case IGMPV3_CHANGE_TO_EXCLUDE:
1147 case IGMPV3_ALLOW_NEW_SOURCES:
1148 case IGMPV3_BLOCK_OLD_SOURCES:
1149 break;
1150
1151 default:
1152 continue;
1153 }
1154
6db6f0ea 1155 src = eth_hdr(skb)->h_source;
bc8c20ac
SA		 1156 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1157 type == IGMPV3_MODE_IS_INCLUDE) &&
1158 ntohs(grec->grec_nsrcs) == 0) {
6db6f0ea 1159 br_ip4_multicast_leave_group(br, port, group, vid, src);
bc8c20ac 1160 } else {
6db6f0ea
FF		 1161 err = br_ip4_multicast_add_group(br, port, group, vid,
1162 src);
bc8c20ac
SA		 1163 if (err)
1164 break;
1165 }
eb1d1641
HX		 1166 }
1167
1168 return err;
1169}
1170
dfd56b8b 1171#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1172static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1173 struct net_bridge_port *port,
06499098
VY		 1174 struct sk_buff *skb,
1175 u16 vid)
08b202b6 1176{
6db6f0ea 1177 const unsigned char *src;
08b202b6
YH		 1178 struct icmp6hdr *icmp6h;
1179 struct mld2_grec *grec;
1180 int i;
1181 int len;
1182 int num;
1183 int err = 0;
1184
1185 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1186 return -EINVAL;
1187
1188 icmp6h = icmp6_hdr(skb);
1189 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
c2d4fbd2 1190 len = skb_transport_offset(skb) + sizeof(*icmp6h);
08b202b6
YH		 1191
1192 for (i = 0; i < num; i++) {
1193 __be16 *nsrcs, _nsrcs;
1194
1195 nsrcs = skb_header_pointer(skb,
1196 len + offsetof(struct mld2_grec,
649e984d 1197 grec_nsrcs),
08b202b6
YH		 1198 sizeof(_nsrcs), &_nsrcs);
1199 if (!nsrcs)
1200 return -EINVAL;
1201
1202 if (!pskb_may_pull(skb,
1203 len + sizeof(*grec) +
d41db9f3 1204 sizeof(struct in6_addr) * ntohs(*nsrcs)))
08b202b6
YH		 1205 return -EINVAL;
1206
1207 grec = (struct mld2_grec *)(skb->data + len);
d41db9f3
LL		 1208 len += sizeof(*grec) +
1209 sizeof(struct in6_addr) * ntohs(*nsrcs);
08b202b6
YH		 1210
1211 /* We treat these as MLDv1 reports for now. */
1212 switch (grec->grec_type) {
1213 case MLD2_MODE_IS_INCLUDE:
1214 case MLD2_MODE_IS_EXCLUDE:
1215 case MLD2_CHANGE_TO_INCLUDE:
1216 case MLD2_CHANGE_TO_EXCLUDE:
1217 case MLD2_ALLOW_NEW_SOURCES:
1218 case MLD2_BLOCK_OLD_SOURCES:
1219 break;
1220
1221 default:
1222 continue;
1223 }
1224
6db6f0ea 1225 src = eth_hdr(skb)->h_source;
bc8c20ac
SA		 1226 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1227 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1228 ntohs(*nsrcs) == 0) {
1229 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
6db6f0ea 1230 vid, src);
bc8c20ac
SA		 1231 } else {
1232 err = br_ip6_multicast_add_group(br, port,
6db6f0ea
FF		 1233 &grec->grec_mca, vid,
1234 src);
9264251e 1235 if (err)
bc8c20ac
SA		 1236 break;
1237 }
08b202b6
YH		 1238 }
1239
1240 return err;
1241}
1242#endif
1243
dc4eb53a 1244static bool br_ip4_multicast_select_querier(struct net_bridge *br,
2cd41431 1245 struct net_bridge_port *port,
dc4eb53a
LL		 1246 __be32 saddr)
1247{
1248 if (!timer_pending(&br->ip4_own_query.timer) &&
1249 !timer_pending(&br->ip4_other_query.timer))
1250 goto update;
1251
1252 if (!br->ip4_querier.addr.u.ip4)
1253 goto update;
1254
1255 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1256 goto update;
1257
1258 return false;
1259
1260update:
1261 br->ip4_querier.addr.u.ip4 = saddr;
1262
2cd41431
LL		 1263 /* update protected by general multicast_lock by caller */
1264 rcu_assign_pointer(br->ip4_querier.port, port);
1265
dc4eb53a
LL		 1266 return true;
1267}
1268
1269#if IS_ENABLED(CONFIG_IPV6)
1270static bool br_ip6_multicast_select_querier(struct net_bridge *br,
2cd41431 1271 struct net_bridge_port *port,
dc4eb53a
LL		 1272 struct in6_addr *saddr)
1273{
1274 if (!timer_pending(&br->ip6_own_query.timer) &&
1275 !timer_pending(&br->ip6_other_query.timer))
1276 goto update;
1277
1278 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1279 goto update;
1280
1281 return false;
1282
1283update:
1284 br->ip6_querier.addr.u.ip6 = *saddr;
1285
2cd41431
LL		 1286 /* update protected by general multicast_lock by caller */
1287 rcu_assign_pointer(br->ip6_querier.port, port);
1288
dc4eb53a
LL		 1289 return true;
1290}
1291#endif
1292
1293static bool br_multicast_select_querier(struct net_bridge *br,
2cd41431 1294 struct net_bridge_port *port,
dc4eb53a
LL		 1295 struct br_ip *saddr)
1296{
1297 switch (saddr->proto) {
1298 case htons(ETH_P_IP):
2cd41431 1299 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
dc4eb53a
LL		 1300#if IS_ENABLED(CONFIG_IPV6)
1301 case htons(ETH_P_IPV6):
2cd41431 1302 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
dc4eb53a
LL		 1303#endif
1304 }
1305
1306 return false;
1307}
1308
cc0fdd80 1309static void
90010b36
LL		 1310br_multicast_update_query_timer(struct net_bridge *br,
1311 struct bridge_mcast_other_query *query,
1312 unsigned long max_delay)
b00589af 1313{
90010b36
LL		 1314 if (!timer_pending(&query->timer))
1315 query->delay_time = jiffies + max_delay;
b00589af 1316
90010b36 1317 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
b00589af
LL		 1318}
1319
6d549648
NF		 1320static void br_port_mc_router_state_change(struct net_bridge_port *p,
1321 bool is_mc_router)
1322{
1323 struct switchdev_attr attr = {
1324 .orig_dev = p->dev,
1325 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
1326 .flags = SWITCHDEV_F_DEFER,
1327 .u.mrouter = is_mc_router,
1328 };
1329
1330 switchdev_port_attr_set(p->dev, &attr);
1331}
1332
7e80c124 1333/*
7c77602f 1334 * Add port to router_list
7e80c124 1335 * list is maintained ordered by pointer value
1336 * and locked by br->multicast_lock and RCU
1337 */
0909e117
HX		 1338static void br_multicast_add_router(struct net_bridge *br,
1339 struct net_bridge_port *port)
1340{
dcdca2c4 1341 struct net_bridge_port *p;
b67bfe0d 1342 struct hlist_node *slot = NULL;
dcdca2c4 1343
1a040eac
NA		 1344 if (!hlist_unhashed(&port->rlist))
1345 return;
1346
b67bfe0d 1347 hlist_for_each_entry(p, &br->router_list, rlist) {
7e80c124 1348 if ((unsigned long) port >= (unsigned long) p)
1349 break;
b67bfe0d 1350 slot = &p->rlist;
dcdca2c4 1351 }
1352
7e80c124 1353 if (slot)
1d023284 1354 hlist_add_behind_rcu(&port->rlist, slot);
dcdca2c4 1355 else
1356 hlist_add_head_rcu(&port->rlist, &br->router_list);
949f1e39 1357 br_rtr_notify(br->dev, port, RTM_NEWMDB);
6d549648 1358 br_port_mc_router_state_change(port, true);
0909e117
HX		 1359}
1360
eb1d1641
HX		 1361static void br_multicast_mark_router(struct net_bridge *br,
1362 struct net_bridge_port *port)
1363{
1364 unsigned long now = jiffies;
eb1d1641
HX		 1365
1366 if (!port) {
7f0aec7a 1367 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY)
eb1d1641
HX		 1368 mod_timer(&br->multicast_router_timer,
1369 now + br->multicast_querier_interval);
1370 return;
1371 }
1372
a55d8246
NA		 1373 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1374 port->multicast_router == MDB_RTR_TYPE_PERM)
eb1d1641
HX		 1375 return;
1376
0909e117 1377 br_multicast_add_router(br, port);
eb1d1641 1378
eb1d1641
HX		 1379 mod_timer(&port->multicast_router_timer,
1380 now + br->multicast_querier_interval);
1381}
1382
1383static void br_multicast_query_received(struct net_bridge *br,
1384 struct net_bridge_port *port,
90010b36 1385 struct bridge_mcast_other_query *query,
dc4eb53a 1386 struct br_ip *saddr,
b00589af 1387 unsigned long max_delay)
eb1d1641 1388{
2cd41431 1389 if (!br_multicast_select_querier(br, port, saddr))
eb1d1641
HX		 1390 return;
1391
dc4eb53a 1392 br_multicast_update_query_timer(br, query, max_delay);
eb1d1641
HX		 1393 br_multicast_mark_router(br, port);
1394}
1395
8ef2a9a5
YH		 1396static int br_ip4_multicast_query(struct net_bridge *br,
1397 struct net_bridge_port *port,
06499098
VY		 1398 struct sk_buff *skb,
1399 u16 vid)
eb1d1641 1400{
b71d1d42 1401 const struct iphdr *iph = ip_hdr(skb);
eb1d1641
HX		 1402 struct igmphdr *ih = igmp_hdr(skb);
1403 struct net_bridge_mdb_entry *mp;
1404 struct igmpv3_query *ih3;
1405 struct net_bridge_port_group *p;
e8051688 1406 struct net_bridge_port_group __rcu **pp;
dc4eb53a 1407 struct br_ip saddr;
eb1d1641
HX		 1408 unsigned long max_delay;
1409 unsigned long now = jiffies;
856ce5d0 1410 unsigned int offset = skb_transport_offset(skb);
eb1d1641 1411 __be32 group;
bec68ff1 1412 int err = 0;
eb1d1641
HX		 1413
1414 spin_lock(&br->multicast_lock);
1415 if (!netif_running(br->dev) ||
1416 (port && port->state == BR_STATE_DISABLED))
1417 goto out;
1418
eb1d1641
HX		 1419 group = ih->group;
1420
856ce5d0 1421 if (skb->len == offset + sizeof(*ih)) {
eb1d1641
HX		 1422 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1423
1424 if (!max_delay) {
1425 max_delay = 10 * HZ;
1426 group = 0;
1427 }
856ce5d0 1428 } else if (skb->len >= offset + sizeof(*ih3)) {
eb1d1641
HX		 1429 ih3 = igmpv3_query_hdr(skb);
1430 if (ih3->nsrcs)
bec68ff1 1431 goto out;
eb1d1641 1432
0ba8c9ec
YH		 1433 max_delay = ih3->code ?
1434 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
9afd85c9 1435 } else {
9ed973cc
LL		 1436 goto out;
1437 }
1438
dc4eb53a
LL		 1439 if (!group) {
1440 saddr.proto = htons(ETH_P_IP);
1441 saddr.u.ip4 = iph->saddr;
b00589af 1442
dc4eb53a
LL		 1443 br_multicast_query_received(br, port, &br->ip4_other_query,
1444 &saddr, max_delay);
eb1d1641 1445 goto out;
dc4eb53a 1446 }
eb1d1641 1447
b0e9a30d 1448 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
eb1d1641
HX		 1449 if (!mp)
1450 goto out;
1451
1452 max_delay *= br->multicast_last_member_count;
1453
8a870178 1454 if (mp->mglist &&
eb1d1641
HX		 1455 (timer_pending(&mp->timer) ?
1456 time_after(mp->timer.expires, now + max_delay) :
1457 try_to_del_timer_sync(&mp->timer) >= 0))
1458 mod_timer(&mp->timer, now + max_delay);
1459
e8051688
ED		 1460 for (pp = &mp->ports;
1461 (p = mlock_dereference(*pp, br)) != NULL;
1462 pp = &p->next) {
eb1d1641
HX		 1463 if (timer_pending(&p->timer) ?
1464 time_after(p->timer.expires, now + max_delay) :
1465 try_to_del_timer_sync(&p->timer) >= 0)
24f9cdcb 1466 mod_timer(&p->timer, now + max_delay);
eb1d1641
HX		 1467 }
1468
1469out:
1470 spin_unlock(&br->multicast_lock);
bec68ff1 1471 return err;
eb1d1641
HX		 1472}
1473
dfd56b8b 1474#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1475static int br_ip6_multicast_query(struct net_bridge *br,
1476 struct net_bridge_port *port,
06499098
VY		 1477 struct sk_buff *skb,
1478 u16 vid)
08b202b6 1479{
b71d1d42 1480 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
eca2a43b 1481 struct mld_msg *mld;
08b202b6
YH		 1482 struct net_bridge_mdb_entry *mp;
1483 struct mld2_query *mld2q;
e8051688
ED		 1484 struct net_bridge_port_group *p;
1485 struct net_bridge_port_group __rcu **pp;
dc4eb53a 1486 struct br_ip saddr;
08b202b6
YH		 1487 unsigned long max_delay;
1488 unsigned long now = jiffies;
856ce5d0 1489 unsigned int offset = skb_transport_offset(skb);
b71d1d42 1490 const struct in6_addr *group = NULL;
9ed973cc 1491 bool is_general_query;
08b202b6
YH		 1492 int err = 0;
1493
1494 spin_lock(&br->multicast_lock);
1495 if (!netif_running(br->dev) ||
1496 (port && port->state == BR_STATE_DISABLED))
1497 goto out;
1498
856ce5d0
LL		 1499 if (skb->len == offset + sizeof(*mld)) {
1500 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
08b202b6
YH		 1501 err = -EINVAL;
1502 goto out;
1503 }
1504 mld = (struct mld_msg *) icmp6_hdr(skb);
4715213d 1505 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
08b202b6
YH		 1506 if (max_delay)
1507 group = &mld->mld_mca;
248ba8ec 1508 } else {
856ce5d0 1509 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
08b202b6
YH		 1510 err = -EINVAL;
1511 goto out;
1512 }
1513 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1514 if (!mld2q->mld2q_nsrcs)
1515 group = &mld2q->mld2q_mca;
e3f5b170
DB		 1516
1517 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
08b202b6
YH		 1518 }
1519
9ed973cc
LL		 1520 is_general_query = group && ipv6_addr_any(group);
1521
dc4eb53a
LL		 1522 if (is_general_query) {
1523 saddr.proto = htons(ETH_P_IPV6);
1524 saddr.u.ip6 = ip6h->saddr;
b00589af 1525
dc4eb53a
LL		 1526 br_multicast_query_received(br, port, &br->ip6_other_query,
1527 &saddr, max_delay);
08b202b6 1528 goto out;
6c03ee8b
LL		 1529 } else if (!group) {
1530 goto out;
dc4eb53a 1531 }
08b202b6 1532
b0e9a30d 1533 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
08b202b6
YH		 1534 if (!mp)
1535 goto out;
1536
1537 max_delay *= br->multicast_last_member_count;
8a870178 1538 if (mp->mglist &&
08b202b6
YH		 1539 (timer_pending(&mp->timer) ?
1540 time_after(mp->timer.expires, now + max_delay) :
1541 try_to_del_timer_sync(&mp->timer) >= 0))
1542 mod_timer(&mp->timer, now + max_delay);
1543
e8051688
ED		 1544 for (pp = &mp->ports;
1545 (p = mlock_dereference(*pp, br)) != NULL;
1546 pp = &p->next) {
08b202b6
YH		 1547 if (timer_pending(&p->timer) ?
1548 time_after(p->timer.expires, now + max_delay) :
1549 try_to_del_timer_sync(&p->timer) >= 0)
24f9cdcb 1550 mod_timer(&p->timer, now + max_delay);
08b202b6
YH		 1551 }
1552
1553out:
1554 spin_unlock(&br->multicast_lock);
1555 return err;
1556}
1557#endif
1558
90010b36
LL		 1559static void
1560br_multicast_leave_group(struct net_bridge *br,
1561 struct net_bridge_port *port,
1562 struct br_ip *group,
1563 struct bridge_mcast_other_query *other_query,
6db6f0ea
FF		 1564 struct bridge_mcast_own_query *own_query,
1565 const unsigned char *src)
eb1d1641
HX		 1566{
1567 struct net_bridge_mdb_htable *mdb;
1568 struct net_bridge_mdb_entry *mp;
1569 struct net_bridge_port_group *p;
1570 unsigned long now;
1571 unsigned long time;
1572
eb1d1641
HX		 1573 spin_lock(&br->multicast_lock);
1574 if (!netif_running(br->dev) ||
544586f7 1575 (port && port->state == BR_STATE_DISABLED))
eb1d1641
HX		 1576 goto out;
1577
e8051688 1578 mdb = mlock_dereference(br->mdb, br);
eb1d1641
HX		 1579 mp = br_mdb_ip_get(mdb, group);
1580 if (!mp)
1581 goto out;
1582
544586f7
SA		 1583 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1584 struct net_bridge_port_group __rcu **pp;
1585
1586 for (pp = &mp->ports;
1587 (p = mlock_dereference(*pp, br)) != NULL;
1588 pp = &p->next) {
6db6f0ea 1589 if (!br_port_group_equal(p, port, src))
544586f7
SA		 1590 continue;
1591
1592 rcu_assign_pointer(*pp, p->next);
1593 hlist_del_init(&p->mglist);
1594 del_timer(&p->timer);
1595 call_rcu_bh(&p->rcu, br_multicast_free_pg);
45ebcce5
ER		 1596 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1597 p->flags);
544586f7
SA		 1598
1599 if (!mp->ports && !mp->mglist &&
1600 netif_running(br->dev))
1601 mod_timer(&mp->timer, jiffies);
1602 }
1603 goto out;
1604 }
1605
1606 if (timer_pending(&other_query->timer))
1607 goto out;
1608
cc0fdd80 1609 if (br->multicast_querier) {
6b7df111
CW		 1610 __br_multicast_send_query(br, port, &mp->addr);
1611
1612 time = jiffies + br->multicast_last_member_count *
1613 br->multicast_last_member_interval;
cc0fdd80 1614
90010b36 1615 mod_timer(&own_query->timer, time);
6b7df111
CW		 1616
1617 for (p = mlock_dereference(mp->ports, br);
1618 p != NULL;
1619 p = mlock_dereference(p->next, br)) {
6db6f0ea 1620 if (!br_port_group_equal(p, port, src))
6b7df111
CW		 1621 continue;
1622
1623 if (!hlist_unhashed(&p->mglist) &&
1624 (timer_pending(&p->timer) ?
1625 time_after(p->timer.expires, time) :
1626 try_to_del_timer_sync(&p->timer) >= 0)) {
1627 mod_timer(&p->timer, time);
1628 }
1629
1630 break;
1631 }
1632 }
1633
eb1d1641
HX		 1634 now = jiffies;
1635 time = now + br->multicast_last_member_count *
1636 br->multicast_last_member_interval;
1637
1638 if (!port) {
454594f3 1639 if (mp->mglist &&
eb1d1641
HX		 1640 (timer_pending(&mp->timer) ?
1641 time_after(mp->timer.expires, time) :
1642 try_to_del_timer_sync(&mp->timer) >= 0)) {
1643 mod_timer(&mp->timer, time);
eb1d1641 1644 }
454594f3
LL		 1645
1646 goto out;
1647 }
1648
1649 for (p = mlock_dereference(mp->ports, br);
1650 p != NULL;
1651 p = mlock_dereference(p->next, br)) {
1652 if (p->port != port)
1653 continue;
1654
1655 if (!hlist_unhashed(&p->mglist) &&
1656 (timer_pending(&p->timer) ?
1657 time_after(p->timer.expires, time) :
1658 try_to_del_timer_sync(&p->timer) >= 0)) {
1659 mod_timer(&p->timer, time);
1660 }
1661
1662 break;
eb1d1641 1663 }
eb1d1641
HX		 1664out:
1665 spin_unlock(&br->multicast_lock);
1666}
1667
8ef2a9a5
YH		 1668static void br_ip4_multicast_leave_group(struct net_bridge *br,
1669 struct net_bridge_port *port,
b0e9a30d 1670 __be32 group,
6db6f0ea
FF		 1671 __u16 vid,
1672 const unsigned char *src)
8ef2a9a5
YH		 1673{
1674 struct br_ip br_group;
90010b36 1675 struct bridge_mcast_own_query *own_query;
8ef2a9a5
YH		 1676
1677 if (ipv4_is_local_multicast(group))
1678 return;
1679
90010b36
LL		 1680 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1681
8ef2a9a5
YH		 1682 br_group.u.ip4 = group;
1683 br_group.proto = htons(ETH_P_IP);
b0e9a30d 1684 br_group.vid = vid;
8ef2a9a5 1685
90010b36 1686 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
6db6f0ea 1687 own_query, src);
8ef2a9a5
YH		 1688}
1689
dfd56b8b 1690#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1691static void br_ip6_multicast_leave_group(struct net_bridge *br,
1692 struct net_bridge_port *port,
b0e9a30d 1693 const struct in6_addr *group,
6db6f0ea
FF		 1694 __u16 vid,
1695 const unsigned char *src)
08b202b6
YH		 1696{
1697 struct br_ip br_group;
90010b36 1698 struct bridge_mcast_own_query *own_query;
08b202b6 1699
3c3769e6 1700 if (ipv6_addr_is_ll_all_nodes(group))
08b202b6
YH		 1701 return;
1702
90010b36
LL		 1703 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1704
4e3fd7a0 1705 br_group.u.ip6 = *group;
08b202b6 1706 br_group.proto = htons(ETH_P_IPV6);
b0e9a30d 1707 br_group.vid = vid;
08b202b6 1708
90010b36 1709 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
6db6f0ea 1710 own_query, src);
08b202b6
YH		 1711}
1712#endif
8ef2a9a5 1713
1080ab95
NA		 1714static void br_multicast_err_count(const struct net_bridge *br,
1715 const struct net_bridge_port *p,
1716 __be16 proto)
1717{
1718 struct bridge_mcast_stats __percpu *stats;
1719 struct bridge_mcast_stats *pstats;
1720
1721 if (!br->multicast_stats_enabled)
1722 return;
1723
1724 if (p)
1725 stats = p->mcast_stats;
1726 else
1727 stats = br->mcast_stats;
1728 if (WARN_ON(!stats))
1729 return;
1730
1731 pstats = this_cpu_ptr(stats);
1732
1733 u64_stats_update_begin(&pstats->syncp);
1734 switch (proto) {
1735 case htons(ETH_P_IP):
1736 pstats->mstats.igmp_parse_errors++;
1737 break;
1738#if IS_ENABLED(CONFIG_IPV6)
1739 case htons(ETH_P_IPV6):
1740 pstats->mstats.mld_parse_errors++;
1741 break;
1742#endif
1743 }
1744 u64_stats_update_end(&pstats->syncp);
1745}
1746
91b02d3d
NA		 1747static void br_multicast_pim(struct net_bridge *br,
1748 struct net_bridge_port *port,
1749 const struct sk_buff *skb)
1750{
1751 unsigned int offset = skb_transport_offset(skb);
1752 struct pimhdr *pimhdr, _pimhdr;
1753
1754 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1755 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1756 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1757 return;
1758
1759 br_multicast_mark_router(br, port);
1760}
1761
eb1d1641
HX		 1762static int br_multicast_ipv4_rcv(struct net_bridge *br,
1763 struct net_bridge_port *port,
06499098
VY		 1764 struct sk_buff *skb,
1765 u16 vid)
eb1d1641 1766{
9afd85c9 1767 struct sk_buff *skb_trimmed = NULL;
6db6f0ea 1768 const unsigned char *src;
eb1d1641 1769 struct igmphdr *ih;
eb1d1641
HX		 1770 int err;
1771
9afd85c9 1772 err = ip_mc_check_igmp(skb, &skb_trimmed);
eb1d1641 1773
9afd85c9 1774 if (err == -ENOMSG) {
91b02d3d 1775 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
bd4265fe 1776 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
91b02d3d
NA		 1777 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1778 if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1779 br_multicast_pim(br, port, skb);
1780 }
eb1d1641 1781 return 0;
9afd85c9 1782 } else if (err < 0) {
1080ab95 1783 br_multicast_err_count(br, port, skb->protocol);
9afd85c9 1784 return err;
bd4265fe 1785 }
eb1d1641 1786
9afd85c9 1787 ih = igmp_hdr(skb);
6db6f0ea 1788 src = eth_hdr(skb)->h_source;
1080ab95 1789 BR_INPUT_SKB_CB(skb)->igmp = ih->type;
eb1d1641
HX		 1790
1791 switch (ih->type) {
1792 case IGMP_HOST_MEMBERSHIP_REPORT:
1793 case IGMPV2_HOST_MEMBERSHIP_REPORT:
62b2bcb4 1794 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
6db6f0ea 1795 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
eb1d1641
HX		 1796 break;
1797 case IGMPV3_HOST_MEMBERSHIP_REPORT:
9afd85c9 1798 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
eb1d1641
HX		 1799 break;
1800 case IGMP_HOST_MEMBERSHIP_QUERY:
9afd85c9 1801 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
eb1d1641
HX		 1802 break;
1803 case IGMP_HOST_LEAVE_MESSAGE:
6db6f0ea 1804 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
eb1d1641
HX		 1805 break;
1806 }
1807
a516993f 1808 if (skb_trimmed && skb_trimmed != skb)
9afd85c9
LL		 1809 kfree_skb(skb_trimmed);
1810
a65056ec 1811 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1080ab95
NA		 1812 BR_MCAST_DIR_RX);
1813
eb1d1641
HX		 1814 return err;
1815}
1816
dfd56b8b 1817#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1818static int br_multicast_ipv6_rcv(struct net_bridge *br,
1819 struct net_bridge_port *port,
06499098
VY		 1820 struct sk_buff *skb,
1821 u16 vid)
08b202b6 1822{
9afd85c9 1823 struct sk_buff *skb_trimmed = NULL;
6db6f0ea 1824 const unsigned char *src;
9afd85c9 1825 struct mld_msg *mld;
08b202b6
YH		 1826 int err;
1827
9afd85c9 1828 err = ipv6_mc_check_mld(skb, &skb_trimmed);
08b202b6 1829
9afd85c9
LL		 1830 if (err == -ENOMSG) {
1831 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1832 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
08b202b6 1833 return 0;
9afd85c9 1834 } else if (err < 0) {
1080ab95 1835 br_multicast_err_count(br, port, skb->protocol);
9afd85c9 1836 return err;
08b202b6
YH		 1837 }
1838
9afd85c9 1839 mld = (struct mld_msg *)skb_transport_header(skb);
1080ab95 1840 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
08b202b6 1841
9afd85c9 1842 switch (mld->mld_type) {
08b202b6 1843 case ICMPV6_MGM_REPORT:
6db6f0ea 1844 src = eth_hdr(skb)->h_source;
fc2af6c7 1845 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
6db6f0ea
FF		 1846 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
1847 src);
08b202b6 1848 break;
08b202b6 1849 case ICMPV6_MLD2_REPORT:
9afd85c9 1850 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
08b202b6
YH		 1851 break;
1852 case ICMPV6_MGM_QUERY:
9afd85c9 1853 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
08b202b6
YH		 1854 break;
1855 case ICMPV6_MGM_REDUCTION:
6db6f0ea
FF		 1856 src = eth_hdr(skb)->h_source;
1857 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
9afd85c9 1858 break;
08b202b6
YH		 1859 }
1860
a516993f 1861 if (skb_trimmed && skb_trimmed != skb)
9afd85c9
LL		 1862 kfree_skb(skb_trimmed);
1863
a65056ec 1864 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1080ab95
NA		 1865 BR_MCAST_DIR_RX);
1866
08b202b6
YH		 1867 return err;
1868}
1869#endif
1870
eb1d1641 1871int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
06499098 1872 struct sk_buff *skb, u16 vid)
eb1d1641 1873{
1080ab95
NA		 1874 int ret = 0;
1875
1fafc7a9
YH		 1876 BR_INPUT_SKB_CB(skb)->igmp = 0;
1877 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1878
eb1d1641
HX		 1879 if (br->multicast_disabled)
1880 return 0;
1881
1882 switch (skb->protocol) {
1883 case htons(ETH_P_IP):
1080ab95
NA		 1884 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1885 break;
dfd56b8b 1886#if IS_ENABLED(CONFIG_IPV6)
08b202b6 1887 case htons(ETH_P_IPV6):
1080ab95
NA		 1888 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1889 break;
08b202b6 1890#endif
eb1d1641
HX		 1891 }
1892
1080ab95 1893 return ret;
eb1d1641
HX		 1894}
1895
cc0fdd80 1896static void br_multicast_query_expired(struct net_bridge *br,
2cd41431
LL		 1897 struct bridge_mcast_own_query *query,
1898 struct bridge_mcast_querier *querier)
cc0fdd80
LL		 1899{
1900 spin_lock(&br->multicast_lock);
1901 if (query->startup_sent < br->multicast_startup_query_count)
1902 query->startup_sent++;
1903
71d9f614 1904 RCU_INIT_POINTER(querier->port, NULL);
cc0fdd80
LL		 1905 br_multicast_send_query(br, NULL, query);
1906 spin_unlock(&br->multicast_lock);
1907}
1908
1909static void br_ip4_multicast_query_expired(unsigned long data)
eb1d1641
HX		 1910{
1911 struct net_bridge *br = (void *)data;
1912
2cd41431 1913 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
cc0fdd80 1914}
eb1d1641 1915
cc0fdd80
LL		 1916#if IS_ENABLED(CONFIG_IPV6)
1917static void br_ip6_multicast_query_expired(unsigned long data)
1918{
1919 struct net_bridge *br = (void *)data;
eb1d1641 1920
2cd41431 1921 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
eb1d1641 1922}
cc0fdd80 1923#endif
eb1d1641
HX		 1924
1925void br_multicast_init(struct net_bridge *br)
1926{
1927 br->hash_elasticity = 4;
1928 br->hash_max = 512;
1929
7f0aec7a 1930 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
c5c23260 1931 br->multicast_querier = 0;
1c8ad5bf 1932 br->multicast_query_use_ifaddr = 0;
eb1d1641
HX		 1933 br->multicast_last_member_count = 2;
1934 br->multicast_startup_query_count = 2;
1935
1936 br->multicast_last_member_interval = HZ;
1937 br->multicast_query_response_interval = 10 * HZ;
1938 br->multicast_startup_query_interval = 125 * HZ / 4;
1939 br->multicast_query_interval = 125 * HZ;
1940 br->multicast_querier_interval = 255 * HZ;
1941 br->multicast_membership_interval = 260 * HZ;
1942
90010b36 1943 br->ip4_other_query.delay_time = 0;
2cd41431 1944 br->ip4_querier.port = NULL;
aa2ae3e7 1945 br->multicast_igmp_version = 2;
cc0fdd80 1946#if IS_ENABLED(CONFIG_IPV6)
aa2ae3e7 1947 br->multicast_mld_version = 1;
90010b36 1948 br->ip6_other_query.delay_time = 0;
2cd41431 1949 br->ip6_querier.port = NULL;
cc0fdd80 1950#endif
0888d5f3 1951 br->has_ipv6_addr = 1;
b00589af 1952
eb1d1641
HX		 1953 spin_lock_init(&br->multicast_lock);
1954 setup_timer(&br->multicast_router_timer,
1955 br_multicast_local_router_expired, 0);
90010b36
LL		 1956 setup_timer(&br->ip4_other_query.timer,
1957 br_ip4_multicast_querier_expired, (unsigned long)br);
1958 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
eb1d1641 1959 (unsigned long)br);
cc0fdd80 1960#if IS_ENABLED(CONFIG_IPV6)
90010b36
LL		 1961 setup_timer(&br->ip6_other_query.timer,
1962 br_ip6_multicast_querier_expired, (unsigned long)br);
1963 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
cc0fdd80
LL		 1964 (unsigned long)br);
1965#endif
eb1d1641
HX		 1966}
1967
cc0fdd80 1968static void __br_multicast_open(struct net_bridge *br,
90010b36 1969 struct bridge_mcast_own_query *query)
eb1d1641 1970{
cc0fdd80 1971 query->startup_sent = 0;
eb1d1641
HX		 1972
1973 if (br->multicast_disabled)
1974 return;
1975
cc0fdd80
LL		 1976 mod_timer(&query->timer, jiffies);
1977}
1978
1979void br_multicast_open(struct net_bridge *br)
1980{
90010b36 1981 __br_multicast_open(br, &br->ip4_own_query);
cc0fdd80 1982#if IS_ENABLED(CONFIG_IPV6)
90010b36 1983 __br_multicast_open(br, &br->ip6_own_query);
cc0fdd80 1984#endif
eb1d1641
HX		 1985}
1986
1987void br_multicast_stop(struct net_bridge *br)
1988{
eb1d1641 1989 del_timer_sync(&br->multicast_router_timer);
90010b36
LL		 1990 del_timer_sync(&br->ip4_other_query.timer);
1991 del_timer_sync(&br->ip4_own_query.timer);
cc0fdd80 1992#if IS_ENABLED(CONFIG_IPV6)
90010b36
LL		 1993 del_timer_sync(&br->ip6_other_query.timer);
1994 del_timer_sync(&br->ip6_own_query.timer);
cc0fdd80 1995#endif
e10177ab
SA		 1996}
1997
1998void br_multicast_dev_del(struct net_bridge *br)
1999{
2000 struct net_bridge_mdb_htable *mdb;
2001 struct net_bridge_mdb_entry *mp;
2002 struct hlist_node *n;
2003 u32 ver;
2004 int i;
eb1d1641
HX		 2005
2006 spin_lock_bh(&br->multicast_lock);
e8051688 2007 mdb = mlock_dereference(br->mdb, br);
eb1d1641
HX		 2008 if (!mdb)
2009 goto out;
2010
2011 br->mdb = NULL;
2012
2013 ver = mdb->ver;
2014 for (i = 0; i < mdb->max; i++) {
b67bfe0d 2015 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
eb1d1641
HX		 2016 hlist[ver]) {
2017 del_timer(&mp->timer);
eb1d1641
HX		 2018 call_rcu_bh(&mp->rcu, br_multicast_free_group);
2019 }
2020 }
2021
2022 if (mdb->old) {
2023 spin_unlock_bh(&br->multicast_lock);
10cc2b50 2024 rcu_barrier_bh();
eb1d1641
HX		 2025 spin_lock_bh(&br->multicast_lock);
2026 WARN_ON(mdb->old);
2027 }
2028
2029 mdb->old = mdb;
2030 call_rcu_bh(&mdb->rcu, br_mdb_free);
2031
2032out:
2033 spin_unlock_bh(&br->multicast_lock);
2034}
0909e117
HX		 2035
2036int br_multicast_set_router(struct net_bridge *br, unsigned long val)
2037{
6ae4ae8e 2038 int err = -EINVAL;
0909e117
HX		 2039
2040 spin_lock_bh(&br->multicast_lock);
0909e117
HX		 2041
2042 switch (val) {
7f0aec7a
NA		 2043 case MDB_RTR_TYPE_DISABLED:
2044 case MDB_RTR_TYPE_PERM:
0909e117
HX		 2045 del_timer(&br->multicast_router_timer);
2046 /* fall through */
7f0aec7a 2047 case MDB_RTR_TYPE_TEMP_QUERY:
0909e117
HX		 2048 br->multicast_router = val;
2049 err = 0;
2050 break;
0909e117
HX		 2051 }
2052
0909e117
HX		 2053 spin_unlock_bh(&br->multicast_lock);
2054
2055 return err;
2056}
2057
7f0aec7a
NA		 2058static void __del_port_router(struct net_bridge_port *p)
2059{
2060 if (hlist_unhashed(&p->rlist))
2061 return;
2062 hlist_del_init_rcu(&p->rlist);
2063 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
6d549648 2064 br_port_mc_router_state_change(p, false);
f12e7d95
NF		 2065
2066 /* don't allow timer refresh */
2067 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2068 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
7f0aec7a
NA		 2069}
2070
0909e117
HX		 2071int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
2072{
2073 struct net_bridge *br = p->br;
a55d8246 2074 unsigned long now = jiffies;
6ae4ae8e 2075 int err = -EINVAL;
0909e117
HX		 2076
2077 spin_lock(&br->multicast_lock);
4950cfd1 2078 if (p->multicast_router == val) {
a55d8246
NA		 2079 /* Refresh the temp router port timer */
2080 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2081 mod_timer(&p->multicast_router_timer,
2082 now + br->multicast_querier_interval);
4950cfd1
NA		 2083 err = 0;
2084 goto unlock;
2085 }
0909e117 2086 switch (val) {
7f0aec7a
NA		 2087 case MDB_RTR_TYPE_DISABLED:
2088 p->multicast_router = MDB_RTR_TYPE_DISABLED;
2089 __del_port_router(p);
2090 del_timer(&p->multicast_router_timer);
2091 break;
2092 case MDB_RTR_TYPE_TEMP_QUERY:
2093 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2094 __del_port_router(p);
2095 break;
2096 case MDB_RTR_TYPE_PERM:
2097 p->multicast_router = MDB_RTR_TYPE_PERM;
0909e117 2098 del_timer(&p->multicast_router_timer);
0909e117
HX		 2099 br_multicast_add_router(br, p);
2100 break;
a55d8246
NA		 2101 case MDB_RTR_TYPE_TEMP:
2102 p->multicast_router = MDB_RTR_TYPE_TEMP;
2103 br_multicast_mark_router(br, p);
2104 break;
7f0aec7a
NA		 2105 default:
2106 goto unlock;
0909e117 2107 }
7f0aec7a
NA		 2108 err = 0;
2109unlock:
0909e117
HX		 2110 spin_unlock(&br->multicast_lock);
2111
2112 return err;
2113}
561f1103 2114
cc0fdd80 2115static void br_multicast_start_querier(struct net_bridge *br,
90010b36 2116 struct bridge_mcast_own_query *query)
561f1103
HX		 2117{
2118 struct net_bridge_port *port;
74857216 2119
cc0fdd80 2120 __br_multicast_open(br, query);
74857216
HX		 2121
2122 list_for_each_entry(port, &br->port_list, list) {
2123 if (port->state == BR_STATE_DISABLED ||
2124 port->state == BR_STATE_BLOCKING)
2125 continue;
2126
90010b36
LL		 2127 if (query == &br->ip4_own_query)
2128 br_multicast_enable(&port->ip4_own_query);
cc0fdd80
LL		 2129#if IS_ENABLED(CONFIG_IPV6)
2130 else
90010b36 2131 br_multicast_enable(&port->ip6_own_query);
cc0fdd80 2132#endif
74857216
HX		 2133 }
2134}
2135
2136int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2137{
e8051688 2138 struct net_bridge_mdb_htable *mdb;
7cb3f921
NA		 2139 struct net_bridge_port *port;
2140 int err = 0;
561f1103 2141
ef5e0d82 2142 spin_lock_bh(&br->multicast_lock);
561f1103
HX		 2143 if (br->multicast_disabled == !val)
2144 goto unlock;
2145
147c1e9b 2146 br_mc_disabled_update(br->dev, !val);
561f1103
HX		 2147 br->multicast_disabled = !val;
2148 if (br->multicast_disabled)
2149 goto unlock;
2150
3a7fda06
HX		 2151 if (!netif_running(br->dev))
2152 goto unlock;
2153
e8051688
ED		 2154 mdb = mlock_dereference(br->mdb, br);
2155 if (mdb) {
2156 if (mdb->old) {
561f1103
HX		 2157 err = -EEXIST;
2158rollback:
2159 br->multicast_disabled = !!val;
2160 goto unlock;
2161 }
2162
e8051688 2163 err = br_mdb_rehash(&br->mdb, mdb->max,
561f1103
HX		 2164 br->hash_elasticity);
2165 if (err)
2166 goto rollback;
2167 }
2168
7cb3f921
NA		 2169 br_multicast_open(br);
2170 list_for_each_entry(port, &br->port_list, list)
2171 __br_multicast_enable_port(port);
561f1103
HX		 2172
2173unlock:
ef5e0d82 2174 spin_unlock_bh(&br->multicast_lock);
561f1103
HX		 2175
2176 return err;
2177}
b195167f 2178
c5c23260
HX		 2179int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2180{
b00589af
LL		 2181 unsigned long max_delay;
2182
c5c23260
HX		 2183 val = !!val;
2184
2185 spin_lock_bh(&br->multicast_lock);
2186 if (br->multicast_querier == val)
2187 goto unlock;
2188
2189 br->multicast_querier = val;
b00589af
LL		 2190 if (!val)
2191 goto unlock;
2192
2193 max_delay = br->multicast_query_response_interval;
b00589af 2194
90010b36
LL		 2195 if (!timer_pending(&br->ip4_other_query.timer))
2196 br->ip4_other_query.delay_time = jiffies + max_delay;
cc0fdd80 2197
90010b36 2198 br_multicast_start_querier(br, &br->ip4_own_query);
cc0fdd80
LL		 2199
2200#if IS_ENABLED(CONFIG_IPV6)
90010b36
LL		 2201 if (!timer_pending(&br->ip6_other_query.timer))
2202 br->ip6_other_query.delay_time = jiffies + max_delay;
cc0fdd80 2203
90010b36 2204 br_multicast_start_querier(br, &br->ip6_own_query);
cc0fdd80 2205#endif
c5c23260
HX		 2206
2207unlock:
2208 spin_unlock_bh(&br->multicast_lock);
2209
2210 return 0;
2211}
2212
b195167f
HX		 2213int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2214{
6ae4ae8e 2215 int err = -EINVAL;
b195167f 2216 u32 old;
e8051688 2217 struct net_bridge_mdb_htable *mdb;
b195167f 2218
fe0d692b 2219 spin_lock_bh(&br->multicast_lock);
b195167f
HX		 2220 if (!is_power_of_2(val))
2221 goto unlock;
e8051688
ED		 2222
2223 mdb = mlock_dereference(br->mdb, br);
2224 if (mdb && val < mdb->size)
b195167f
HX		 2225 goto unlock;
2226
2227 err = 0;
2228
2229 old = br->hash_max;
2230 br->hash_max = val;
2231
e8051688
ED		 2232 if (mdb) {
2233 if (mdb->old) {
b195167f
HX		 2234 err = -EEXIST;
2235rollback:
2236 br->hash_max = old;
2237 goto unlock;
2238 }
2239
2240 err = br_mdb_rehash(&br->mdb, br->hash_max,
2241 br->hash_elasticity);
2242 if (err)
2243 goto rollback;
2244 }
2245
2246unlock:
fe0d692b 2247 spin_unlock_bh(&br->multicast_lock);
b195167f
HX		 2248
2249 return err;
2250}
07f8ac4a 2251
5e923585
NA		 2252int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2253{
2254 /* Currently we support only version 2 and 3 */
2255 switch (val) {
2256 case 2:
2257 case 3:
2258 break;
2259 default:
2260 return -EINVAL;
2261 }
2262
2263 spin_lock_bh(&br->multicast_lock);
2264 br->multicast_igmp_version = val;
2265 spin_unlock_bh(&br->multicast_lock);
2266
2267 return 0;
2268}
2269
aa2ae3e7
NA		 2270#if IS_ENABLED(CONFIG_IPV6)
2271int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2272{
2273 /* Currently we support version 1 and 2 */
2274 switch (val) {
2275 case 1:
2276 case 2:
2277 break;
2278 default:
2279 return -EINVAL;
2280 }
2281
2282 spin_lock_bh(&br->multicast_lock);
2283 br->multicast_mld_version = val;
2284 spin_unlock_bh(&br->multicast_lock);
2285
2286 return 0;
2287}
2288#endif
2289
07f8ac4a
LL		 2290/**
2291 * br_multicast_list_adjacent - Returns snooped multicast addresses
2292 * @dev: The bridge port adjacent to which to retrieve addresses
2293 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2294 *
2295 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2296 * snooping feature on all bridge ports of dev's bridge device, excluding
2297 * the addresses from dev itself.
2298 *
2299 * Returns the number of items added to br_ip_list.
2300 *
2301 * Notes:
2302 * - br_ip_list needs to be initialized by caller
2303 * - br_ip_list might contain duplicates in the end
2304 * (needs to be taken care of by caller)
2305 * - br_ip_list needs to be freed by caller
2306 */
2307int br_multicast_list_adjacent(struct net_device *dev,
2308 struct list_head *br_ip_list)
2309{
2310 struct net_bridge *br;
2311 struct net_bridge_port *port;
2312 struct net_bridge_port_group *group;
2313 struct br_ip_list *entry;
2314 int count = 0;
2315
2316 rcu_read_lock();
2317 if (!br_ip_list || !br_port_exists(dev))
2318 goto unlock;
2319
2320 port = br_port_get_rcu(dev);
2321 if (!port || !port->br)
2322 goto unlock;
2323
2324 br = port->br;
2325
2326 list_for_each_entry_rcu(port, &br->port_list, list) {
2327 if (!port->dev || port->dev == dev)
2328 continue;
2329
2330 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2331 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2332 if (!entry)
2333 goto unlock;
2334
2335 entry->addr = group->addr;
2336 list_add(&entry->list, br_ip_list);
2337 count++;
2338 }
2339 }
2340
2341unlock:
2342 rcu_read_unlock();
2343 return count;
2344}
2345EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2cd41431 2346
c34963e2
LL		 2347/**
2348 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2349 * @dev: The bridge port providing the bridge on which to check for a querier
2350 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2351 *
2352 * Checks whether the given interface has a bridge on top and if so returns
2353 * true if a valid querier exists anywhere on the bridged link layer.
2354 * Otherwise returns false.
2355 */
2356bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2357{
2358 struct net_bridge *br;
2359 struct net_bridge_port *port;
2360 struct ethhdr eth;
2361 bool ret = false;
2362
2363 rcu_read_lock();
2364 if (!br_port_exists(dev))
2365 goto unlock;
2366
2367 port = br_port_get_rcu(dev);
2368 if (!port || !port->br)
2369 goto unlock;
2370
2371 br = port->br;
2372
2373 memset(&eth, 0, sizeof(eth));
2374 eth.h_proto = htons(proto);
2375
2376 ret = br_multicast_querier_exists(br, &eth);
2377
2378unlock:
2379 rcu_read_unlock();
2380 return ret;
2381}
2382EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2383
2cd41431
LL		 2384/**
2385 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2386 * @dev: The bridge port adjacent to which to check for a querier
2387 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2388 *
2389 * Checks whether the given interface has a bridge on top and if so returns
2390 * true if a selected querier is behind one of the other ports of this
2391 * bridge. Otherwise returns false.
2392 */
2393bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2394{
2395 struct net_bridge *br;
2396 struct net_bridge_port *port;
2397 bool ret = false;
2398
2399 rcu_read_lock();
2400 if (!br_port_exists(dev))
2401 goto unlock;
2402
2403 port = br_port_get_rcu(dev);
2404 if (!port || !port->br)
2405 goto unlock;
2406
2407 br = port->br;
2408
2409 switch (proto) {
2410 case ETH_P_IP:
2411 if (!timer_pending(&br->ip4_other_query.timer) ||
2412 rcu_dereference(br->ip4_querier.port) == port)
2413 goto unlock;
2414 break;
3993c4e1 2415#if IS_ENABLED(CONFIG_IPV6)
2cd41431
LL		 2416 case ETH_P_IPV6:
2417 if (!timer_pending(&br->ip6_other_query.timer) ||
2418 rcu_dereference(br->ip6_querier.port) == port)
2419 goto unlock;
2420 break;
3993c4e1 2421#endif
2cd41431
LL		 2422 default:
2423 goto unlock;
2424 }
2425
2426 ret = true;
2427unlock:
2428 rcu_read_unlock();
2429 return ret;
2430}
2431EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
1080ab95
NA		 2432
2433static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
a65056ec 2434 const struct sk_buff *skb, u8 type, u8 dir)
1080ab95
NA		 2435{
2436 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
a65056ec
NA		 2437 __be16 proto = skb->protocol;
2438 unsigned int t_len;
1080ab95
NA		 2439
2440 u64_stats_update_begin(&pstats->syncp);
2441 switch (proto) {
2442 case htons(ETH_P_IP):
a65056ec 2443 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
1080ab95
NA		 2444 switch (type) {
2445 case IGMP_HOST_MEMBERSHIP_REPORT:
2446 pstats->mstats.igmp_v1reports[dir]++;
2447 break;
2448 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2449 pstats->mstats.igmp_v2reports[dir]++;
2450 break;
2451 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2452 pstats->mstats.igmp_v3reports[dir]++;
2453 break;
2454 case IGMP_HOST_MEMBERSHIP_QUERY:
a65056ec
NA		 2455 if (t_len != sizeof(struct igmphdr)) {
2456 pstats->mstats.igmp_v3queries[dir]++;
2457 } else {
2458 unsigned int offset = skb_transport_offset(skb);
2459 struct igmphdr *ih, _ihdr;
2460
2461 ih = skb_header_pointer(skb, offset,
2462 sizeof(_ihdr), &_ihdr);
2463 if (!ih)
2464 break;
2465 if (!ih->code)
2466 pstats->mstats.igmp_v1queries[dir]++;
2467 else
2468 pstats->mstats.igmp_v2queries[dir]++;
2469 }
1080ab95
NA		 2470 break;
2471 case IGMP_HOST_LEAVE_MESSAGE:
2472 pstats->mstats.igmp_leaves[dir]++;
2473 break;
2474 }
2475 break;
2476#if IS_ENABLED(CONFIG_IPV6)
2477 case htons(ETH_P_IPV6):
a65056ec
NA		 2478 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2479 sizeof(struct ipv6hdr);
2480 t_len -= skb_network_header_len(skb);
1080ab95
NA		 2481 switch (type) {
2482 case ICMPV6_MGM_REPORT:
2483 pstats->mstats.mld_v1reports[dir]++;
2484 break;
2485 case ICMPV6_MLD2_REPORT:
2486 pstats->mstats.mld_v2reports[dir]++;
2487 break;
2488 case ICMPV6_MGM_QUERY:
a65056ec
NA		 2489 if (t_len != sizeof(struct mld_msg))
2490 pstats->mstats.mld_v2queries[dir]++;
2491 else
2492 pstats->mstats.mld_v1queries[dir]++;
1080ab95
NA		 2493 break;
2494 case ICMPV6_MGM_REDUCTION:
2495 pstats->mstats.mld_leaves[dir]++;
2496 break;
2497 }
2498 break;
2499#endif /* CONFIG_IPV6 */
2500 }
2501 u64_stats_update_end(&pstats->syncp);
2502}
2503
2504void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
a65056ec 2505 const struct sk_buff *skb, u8 type, u8 dir)
1080ab95
NA		 2506{
2507 struct bridge_mcast_stats __percpu *stats;
2508
2509 /* if multicast_disabled is true then igmp type can't be set */
2510 if (!type || !br->multicast_stats_enabled)
2511 return;
2512
2513 if (p)
2514 stats = p->mcast_stats;
2515 else
2516 stats = br->mcast_stats;
2517 if (WARN_ON(!stats))
2518 return;
2519
a65056ec 2520 br_mcast_stats_add(stats, skb, type, dir);
1080ab95
NA		 2521}
2522
2523int br_multicast_init_stats(struct net_bridge *br)
2524{
2525 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2526 if (!br->mcast_stats)
2527 return -ENOMEM;
2528
2529 return 0;
2530}
2531
b6fe0440
IS		 2532void br_multicast_uninit_stats(struct net_bridge *br)
2533{
2534 free_percpu(br->mcast_stats);
2535}
2536
1080ab95
NA		 2537static void mcast_stats_add_dir(u64 *dst, u64 *src)
2538{
2539 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2540 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2541}
2542
2543void br_multicast_get_stats(const struct net_bridge *br,
2544 const struct net_bridge_port *p,
2545 struct br_mcast_stats *dest)
2546{
2547 struct bridge_mcast_stats __percpu *stats;
2548 struct br_mcast_stats tdst;
2549 int i;
2550
2551 memset(dest, 0, sizeof(*dest));
2552 if (p)
2553 stats = p->mcast_stats;
2554 else
2555 stats = br->mcast_stats;
2556 if (WARN_ON(!stats))
2557 return;
2558
2559 memset(&tdst, 0, sizeof(tdst));
2560 for_each_possible_cpu(i) {
2561 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2562 struct br_mcast_stats temp;
2563 unsigned int start;
2564
2565 do {
2566 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2567 memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2568 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2569
a65056ec
NA		 2570 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2571 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2572 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
1080ab95
NA		 2573 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2574 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2575 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2576 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2577 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2578
a65056ec
NA		 2579 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2580 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
1080ab95
NA		 2581 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2582 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2583 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2584 tdst.mld_parse_errors += temp.mld_parse_errors;
2585 }
2586 memcpy(dest, &tdst, sizeof(*dest));
2587}
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git