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netpoll: Fix missing TXQ unlock and and OOPS.
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / bridge / br_multicast.c
CommitLineData
eb1d1641
HX		 1/*
2 * Bridge multicast support.
3 *
4 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13#include <linux/err.h>
14#include <linux/if_ether.h>
15#include <linux/igmp.h>
16#include <linux/jhash.h>
17#include <linux/kernel.h>
b195167f 18#include <linux/log2.h>
eb1d1641
HX		 19#include <linux/netdevice.h>
20#include <linux/netfilter_bridge.h>
21#include <linux/random.h>
22#include <linux/rculist.h>
23#include <linux/skbuff.h>
24#include <linux/slab.h>
25#include <linux/timer.h>
26#include <net/ip.h>
dfd56b8b 27#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 28#include <net/ipv6.h>
29#include <net/mld.h>
d4c4f07d 30#include <net/ip6_checksum.h>
08b202b6 31#endif
eb1d1641
HX		 32
33#include "br_private.h"
34
c83b8fab 35static void br_multicast_start_querier(struct net_bridge *br);
2ce297fc 36unsigned int br_mdb_rehash_seq;
c83b8fab 37
8ef2a9a5
YH		 38static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
39{
40 if (a->proto != b->proto)
41 return 0;
b0e9a30d
VY		 42 if (a->vid != b->vid)
43 return 0;
8ef2a9a5
YH		 44 switch (a->proto) {
45 case htons(ETH_P_IP):
46 return a->u.ip4 == b->u.ip4;
dfd56b8b 47#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 48 case htons(ETH_P_IPV6):
49 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
50#endif
8ef2a9a5
YH		 51 }
52 return 0;
53}
54
b0e9a30d
VY		 55static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
56 __u16 vid)
eb1d1641 57{
b0e9a30d 58 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
eb1d1641
HX		 59}
60
dfd56b8b 61#if IS_ENABLED(CONFIG_IPV6)
08b202b6 62static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
b0e9a30d
VY		 63 const struct in6_addr *ip,
64 __u16 vid)
08b202b6 65{
b0e9a30d
VY		 66 return jhash_2words(ipv6_addr_hash(ip), vid,
67 mdb->secret) & (mdb->max - 1);
08b202b6
YH		 68}
69#endif
70
8ef2a9a5
YH		 71static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
72 struct br_ip *ip)
73{
74 switch (ip->proto) {
75 case htons(ETH_P_IP):
b0e9a30d 76 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
dfd56b8b 77#if IS_ENABLED(CONFIG_IPV6)
08b202b6 78 case htons(ETH_P_IPV6):
b0e9a30d 79 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
08b202b6 80#endif
8ef2a9a5
YH		 81 }
82 return 0;
eb1d1641
HX		 83}
84
85static struct net_bridge_mdb_entry *__br_mdb_ip_get(
8ef2a9a5 86 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
eb1d1641
HX		 87{
88 struct net_bridge_mdb_entry *mp;
eb1d1641 89
b67bfe0d 90 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
8ef2a9a5 91 if (br_ip_equal(&mp->addr, dst))
eb1d1641
HX		 92 return mp;
93 }
94
95 return NULL;
96}
97
cfd56754
CW		 98struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
99 struct br_ip *dst)
7f285fa7
HX		 100{
101 if (!mdb)
102 return NULL;
103
104 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
105}
106
8ef2a9a5 107static struct net_bridge_mdb_entry *br_mdb_ip4_get(
b0e9a30d 108 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
eb1d1641 109{
8ef2a9a5
YH		 110 struct br_ip br_dst;
111
112 br_dst.u.ip4 = dst;
113 br_dst.proto = htons(ETH_P_IP);
b0e9a30d 114 br_dst.vid = vid;
0821ec55 115
7f285fa7 116 return br_mdb_ip_get(mdb, &br_dst);
8ef2a9a5
YH		 117}
118
dfd56b8b 119#if IS_ENABLED(CONFIG_IPV6)
08b202b6 120static struct net_bridge_mdb_entry *br_mdb_ip6_get(
b0e9a30d
VY		 121 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
122 __u16 vid)
08b202b6
YH		 123{
124 struct br_ip br_dst;
0821ec55 125
4e3fd7a0 126 br_dst.u.ip6 = *dst;
08b202b6 127 br_dst.proto = htons(ETH_P_IPV6);
b0e9a30d 128 br_dst.vid = vid;
08b202b6 129
7f285fa7 130 return br_mdb_ip_get(mdb, &br_dst);
08b202b6
YH		 131}
132#endif
133
eb1d1641 134struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
fbca58a2 135 struct sk_buff *skb, u16 vid)
eb1d1641 136{
e8051688 137 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
8ef2a9a5
YH		 138 struct br_ip ip;
139
7f285fa7 140 if (br->multicast_disabled)
eb1d1641
HX		 141 return NULL;
142
8ef2a9a5 143 if (BR_INPUT_SKB_CB(skb)->igmp)
eb1d1641
HX		 144 return NULL;
145
8ef2a9a5 146 ip.proto = skb->protocol;
fbca58a2 147 ip.vid = vid;
8ef2a9a5 148
eb1d1641
HX		 149 switch (skb->protocol) {
150 case htons(ETH_P_IP):
8ef2a9a5
YH		 151 ip.u.ip4 = ip_hdr(skb)->daddr;
152 break;
dfd56b8b 153#if IS_ENABLED(CONFIG_IPV6)
08b202b6 154 case htons(ETH_P_IPV6):
4e3fd7a0 155 ip.u.ip6 = ipv6_hdr(skb)->daddr;
08b202b6
YH		 156 break;
157#endif
8ef2a9a5
YH		 158 default:
159 return NULL;
eb1d1641
HX		 160 }
161
8ef2a9a5 162 return br_mdb_ip_get(mdb, &ip);
eb1d1641
HX		 163}
164
165static void br_mdb_free(struct rcu_head *head)
166{
167 struct net_bridge_mdb_htable *mdb =
168 container_of(head, struct net_bridge_mdb_htable, rcu);
169 struct net_bridge_mdb_htable *old = mdb->old;
170
171 mdb->old = NULL;
172 kfree(old->mhash);
173 kfree(old);
174}
175
176static int br_mdb_copy(struct net_bridge_mdb_htable *new,
177 struct net_bridge_mdb_htable *old,
178 int elasticity)
179{
180 struct net_bridge_mdb_entry *mp;
eb1d1641
HX		 181 int maxlen;
182 int len;
183 int i;
184
185 for (i = 0; i < old->max; i++)
b67bfe0d 186 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
eb1d1641 187 hlist_add_head(&mp->hlist[new->ver],
8ef2a9a5 188 &new->mhash[br_ip_hash(new, &mp->addr)]);
eb1d1641
HX		 189
190 if (!elasticity)
191 return 0;
192
193 maxlen = 0;
194 for (i = 0; i < new->max; i++) {
195 len = 0;
b67bfe0d 196 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
eb1d1641
HX		 197 len++;
198 if (len > maxlen)
199 maxlen = len;
200 }
201
202 return maxlen > elasticity ? -EINVAL : 0;
203}
204
cfd56754 205void br_multicast_free_pg(struct rcu_head *head)
eb1d1641
HX		 206{
207 struct net_bridge_port_group *p =
208 container_of(head, struct net_bridge_port_group, rcu);
209
210 kfree(p);
211}
212
213static void br_multicast_free_group(struct rcu_head *head)
214{
215 struct net_bridge_mdb_entry *mp =
216 container_of(head, struct net_bridge_mdb_entry, rcu);
217
218 kfree(mp);
219}
220
221static void br_multicast_group_expired(unsigned long data)
222{
223 struct net_bridge_mdb_entry *mp = (void *)data;
224 struct net_bridge *br = mp->br;
225 struct net_bridge_mdb_htable *mdb;
226
227 spin_lock(&br->multicast_lock);
228 if (!netif_running(br->dev) || timer_pending(&mp->timer))
229 goto out;
230
8a870178 231 mp->mglist = false;
eb1d1641
HX		 232
233 if (mp->ports)
234 goto out;
235
e8051688
ED		 236 mdb = mlock_dereference(br->mdb, br);
237
eb1d1641
HX		 238 hlist_del_rcu(&mp->hlist[mdb->ver]);
239 mdb->size--;
240
eb1d1641
HX		 241 call_rcu_bh(&mp->rcu, br_multicast_free_group);
242
243out:
244 spin_unlock(&br->multicast_lock);
245}
246
247static void br_multicast_del_pg(struct net_bridge *br,
248 struct net_bridge_port_group *pg)
249{
e8051688 250 struct net_bridge_mdb_htable *mdb;
eb1d1641
HX		 251 struct net_bridge_mdb_entry *mp;
252 struct net_bridge_port_group *p;
e8051688
ED		 253 struct net_bridge_port_group __rcu **pp;
254
255 mdb = mlock_dereference(br->mdb, br);
eb1d1641 256
8ef2a9a5 257 mp = br_mdb_ip_get(mdb, &pg->addr);
eb1d1641
HX		 258 if (WARN_ON(!mp))
259 return;
260
e8051688
ED		 261 for (pp = &mp->ports;
262 (p = mlock_dereference(*pp, br)) != NULL;
263 pp = &p->next) {
eb1d1641
HX		 264 if (p != pg)
265 continue;
266
83f6a740 267 rcu_assign_pointer(*pp, p->next);
eb1d1641
HX		 268 hlist_del_init(&p->mglist);
269 del_timer(&p->timer);
eb1d1641
HX		 270 call_rcu_bh(&p->rcu, br_multicast_free_pg);
271
8a870178 272 if (!mp->ports && !mp->mglist &&
eb1d1641
HX		 273 netif_running(br->dev))
274 mod_timer(&mp->timer, jiffies);
275
276 return;
277 }
278
279 WARN_ON(1);
280}
281
282static void br_multicast_port_group_expired(unsigned long data)
283{
284 struct net_bridge_port_group *pg = (void *)data;
285 struct net_bridge *br = pg->port->br;
286
287 spin_lock(&br->multicast_lock);
288 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
ccb1c31a 289 hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
eb1d1641
HX		 290 goto out;
291
292 br_multicast_del_pg(br, pg);
293
294out:
295 spin_unlock(&br->multicast_lock);
296}
297
e8051688 298static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
eb1d1641
HX		 299 int elasticity)
300{
e8051688 301 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
eb1d1641
HX		 302 struct net_bridge_mdb_htable *mdb;
303 int err;
304
305 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
306 if (!mdb)
307 return -ENOMEM;
308
309 mdb->max = max;
310 mdb->old = old;
311
312 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
313 if (!mdb->mhash) {
314 kfree(mdb);
315 return -ENOMEM;
316 }
317
318 mdb->size = old ? old->size : 0;
319 mdb->ver = old ? old->ver ^ 1 : 0;
320
321 if (!old || elasticity)
322 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
323 else
324 mdb->secret = old->secret;
325
326 if (!old)
327 goto out;
328
329 err = br_mdb_copy(mdb, old, elasticity);
330 if (err) {
331 kfree(mdb->mhash);
332 kfree(mdb);
333 return err;
334 }
335
2ce297fc 336 br_mdb_rehash_seq++;
eb1d1641
HX		 337 call_rcu_bh(&mdb->rcu, br_mdb_free);
338
339out:
340 rcu_assign_pointer(*mdbp, mdb);
341
342 return 0;
343}
344
8ef2a9a5
YH		 345static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
346 __be32 group)
eb1d1641
HX		 347{
348 struct sk_buff *skb;
349 struct igmphdr *ih;
350 struct ethhdr *eth;
351 struct iphdr *iph;
352
353 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
354 sizeof(*ih) + 4);
355 if (!skb)
356 goto out;
357
358 skb->protocol = htons(ETH_P_IP);
359
360 skb_reset_mac_header(skb);
361 eth = eth_hdr(skb);
362
363 memcpy(eth->h_source, br->dev->dev_addr, 6);
364 eth->h_dest[0] = 1;
365 eth->h_dest[1] = 0;
366 eth->h_dest[2] = 0x5e;
367 eth->h_dest[3] = 0;
368 eth->h_dest[4] = 0;
369 eth->h_dest[5] = 1;
370 eth->h_proto = htons(ETH_P_IP);
371 skb_put(skb, sizeof(*eth));
372
373 skb_set_network_header(skb, skb->len);
374 iph = ip_hdr(skb);
375
376 iph->version = 4;
377 iph->ihl = 6;
378 iph->tos = 0xc0;
379 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
380 iph->id = 0;
381 iph->frag_off = htons(IP_DF);
382 iph->ttl = 1;
383 iph->protocol = IPPROTO_IGMP;
384 iph->saddr = 0;
385 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
386 ((u8 *)&iph[1])[0] = IPOPT_RA;
387 ((u8 *)&iph[1])[1] = 4;
388 ((u8 *)&iph[1])[2] = 0;
389 ((u8 *)&iph[1])[3] = 0;
390 ip_send_check(iph);
391 skb_put(skb, 24);
392
393 skb_set_transport_header(skb, skb->len);
394 ih = igmp_hdr(skb);
395 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
396 ih->code = (group ? br->multicast_last_member_interval :
397 br->multicast_query_response_interval) /
398 (HZ / IGMP_TIMER_SCALE);
399 ih->group = group;
400 ih->csum = 0;
401 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
402 skb_put(skb, sizeof(*ih));
403
404 __skb_pull(skb, sizeof(*eth));
405
406out:
407 return skb;
408}
409
dfd56b8b 410#if IS_ENABLED(CONFIG_IPV6)
08b202b6 411static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
b71d1d42 412 const struct in6_addr *group)
08b202b6
YH		 413{
414 struct sk_buff *skb;
415 struct ipv6hdr *ip6h;
416 struct mld_msg *mldq;
417 struct ethhdr *eth;
418 u8 *hopopt;
419 unsigned long interval;
420
421 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
422 8 + sizeof(*mldq));
423 if (!skb)
424 goto out;
425
426 skb->protocol = htons(ETH_P_IPV6);
427
428 /* Ethernet header */
429 skb_reset_mac_header(skb);
430 eth = eth_hdr(skb);
431
432 memcpy(eth->h_source, br->dev->dev_addr, 6);
08b202b6
YH		 433 eth->h_proto = htons(ETH_P_IPV6);
434 skb_put(skb, sizeof(*eth));
435
436 /* IPv6 header + HbH option */
437 skb_set_network_header(skb, skb->len);
438 ip6h = ipv6_hdr(skb);
439
440 *(__force __be32 *)ip6h = htonl(0x60000000);
76d66158 441 ip6h->payload_len = htons(8 + sizeof(*mldq));
08b202b6
YH		 442 ip6h->nexthdr = IPPROTO_HOPOPTS;
443 ip6h->hop_limit = 1;
a7bff75b 444 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
d1d81d4c
UW		 445 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
446 &ip6h->saddr)) {
447 kfree_skb(skb);
448 return NULL;
449 }
36cff5a1 450 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
08b202b6
YH		 451
452 hopopt = (u8 *)(ip6h + 1);
453 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
454 hopopt[1] = 0; /* length of HbH */
455 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
456 hopopt[3] = 2; /* Length of RA Option */
457 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
458 hopopt[5] = 0;
1de5a71c
EZ		 459 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
460 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
08b202b6
YH		 461
462 skb_put(skb, sizeof(*ip6h) + 8);
463
464 /* ICMPv6 */
465 skb_set_transport_header(skb, skb->len);
466 mldq = (struct mld_msg *) icmp6_hdr(skb);
467
32de868c
LL		 468 interval = ipv6_addr_any(group) ?
469 br->multicast_query_response_interval :
470 br->multicast_last_member_interval;
08b202b6
YH		 471
472 mldq->mld_type = ICMPV6_MGM_QUERY;
473 mldq->mld_code = 0;
474 mldq->mld_cksum = 0;
475 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
476 mldq->mld_reserved = 0;
4e3fd7a0 477 mldq->mld_mca = *group;
08b202b6
YH		 478
479 /* checksum */
480 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
481 sizeof(*mldq), IPPROTO_ICMPV6,
482 csum_partial(mldq,
483 sizeof(*mldq), 0));
484 skb_put(skb, sizeof(*mldq));
485
486 __skb_pull(skb, sizeof(*eth));
487
488out:
489 return skb;
490}
491#endif
492
8ef2a9a5
YH		 493static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
494 struct br_ip *addr)
495{
496 switch (addr->proto) {
497 case htons(ETH_P_IP):
498 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
dfd56b8b 499#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 500 case htons(ETH_P_IPV6):
501 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
502#endif
8ef2a9a5
YH		 503 }
504 return NULL;
505}
506
eb1d1641 507static struct net_bridge_mdb_entry *br_multicast_get_group(
8ef2a9a5
YH		 508 struct net_bridge *br, struct net_bridge_port *port,
509 struct br_ip *group, int hash)
eb1d1641 510{
e8051688 511 struct net_bridge_mdb_htable *mdb;
eb1d1641 512 struct net_bridge_mdb_entry *mp;
95c96174
ED		 513 unsigned int count = 0;
514 unsigned int max;
eb1d1641
HX		 515 int elasticity;
516 int err;
517
e8051688 518 mdb = rcu_dereference_protected(br->mdb, 1);
b67bfe0d 519 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
eb1d1641 520 count++;
8ef2a9a5 521 if (unlikely(br_ip_equal(group, &mp->addr)))
eb1d1641 522 return mp;
eb1d1641
HX		 523 }
524
525 elasticity = 0;
526 max = mdb->max;
527
528 if (unlikely(count > br->hash_elasticity && count)) {
529 if (net_ratelimit())
28a16c97 530 br_info(br, "Multicast hash table "
531 "chain limit reached: %s\n",
532 port ? port->dev->name : br->dev->name);
eb1d1641
HX		 533
534 elasticity = br->hash_elasticity;
535 }
536
537 if (mdb->size >= max) {
538 max *= 2;
036be6db
TG		 539 if (unlikely(max > br->hash_max)) {
540 br_warn(br, "Multicast hash table maximum of %d "
541 "reached, disabling snooping: %s\n",
542 br->hash_max,
543 port ? port->dev->name : br->dev->name);
eb1d1641
HX		 544 err = -E2BIG;
545disable:
546 br->multicast_disabled = 1;
547 goto err;
548 }
549 }
550
551 if (max > mdb->max || elasticity) {
552 if (mdb->old) {
553 if (net_ratelimit())
28a16c97 554 br_info(br, "Multicast hash table "
555 "on fire: %s\n",
556 port ? port->dev->name : br->dev->name);
eb1d1641
HX		 557 err = -EEXIST;
558 goto err;
559 }
560
561 err = br_mdb_rehash(&br->mdb, max, elasticity);
562 if (err) {
28a16c97 563 br_warn(br, "Cannot rehash multicast "
564 "hash table, disabling snooping: %s, %d, %d\n",
565 port ? port->dev->name : br->dev->name,
566 mdb->size, err);
eb1d1641
HX		 567 goto disable;
568 }
569
570 err = -EAGAIN;
571 goto err;
572 }
573
574 return NULL;
575
576err:
577 mp = ERR_PTR(err);
578 return mp;
579}
580
cfd56754
CW		 581struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
582 struct net_bridge_port *port, struct br_ip *group)
eb1d1641 583{
e8051688 584 struct net_bridge_mdb_htable *mdb;
eb1d1641
HX		 585 struct net_bridge_mdb_entry *mp;
586 int hash;
4c0833bc 587 int err;
eb1d1641 588
e8051688 589 mdb = rcu_dereference_protected(br->mdb, 1);
eb1d1641 590 if (!mdb) {
4c0833bc
TK		 591 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
592 if (err)
593 return ERR_PTR(err);
eb1d1641
HX		 594 goto rehash;
595 }
596
597 hash = br_ip_hash(mdb, group);
598 mp = br_multicast_get_group(br, port, group, hash);
599 switch (PTR_ERR(mp)) {
600 case 0:
601 break;
602
603 case -EAGAIN:
604rehash:
e8051688 605 mdb = rcu_dereference_protected(br->mdb, 1);
eb1d1641
HX		 606 hash = br_ip_hash(mdb, group);
607 break;
608
609 default:
610 goto out;
611 }
612
613 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
614 if (unlikely(!mp))
4c0833bc 615 return ERR_PTR(-ENOMEM);
eb1d1641
HX		 616
617 mp->br = br;
8ef2a9a5 618 mp->addr = *group;
eb1d1641
HX		 619 setup_timer(&mp->timer, br_multicast_group_expired,
620 (unsigned long)mp);
eb1d1641
HX		 621
622 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
623 mdb->size++;
624
625out:
626 return mp;
627}
628
cfd56754
CW		 629struct net_bridge_port_group *br_multicast_new_port_group(
630 struct net_bridge_port *port,
631 struct br_ip *group,
ccb1c31a
AW		 632 struct net_bridge_port_group __rcu *next,
633 unsigned char state)
cfd56754
CW		 634{
635 struct net_bridge_port_group *p;
636
637 p = kzalloc(sizeof(*p), GFP_ATOMIC);
638 if (unlikely(!p))
639 return NULL;
640
641 p->addr = *group;
642 p->port = port;
ccb1c31a 643 p->state = state;
eca2a43b 644 rcu_assign_pointer(p->next, next);
cfd56754
CW		 645 hlist_add_head(&p->mglist, &port->mglist);
646 setup_timer(&p->timer, br_multicast_port_group_expired,
647 (unsigned long)p);
648 return p;
649}
650
eb1d1641 651static int br_multicast_add_group(struct net_bridge *br,
8ef2a9a5
YH		 652 struct net_bridge_port *port,
653 struct br_ip *group)
eb1d1641
HX		 654{
655 struct net_bridge_mdb_entry *mp;
656 struct net_bridge_port_group *p;
e8051688 657 struct net_bridge_port_group __rcu **pp;
eb1d1641
HX		 658 unsigned long now = jiffies;
659 int err;
660
eb1d1641
HX		 661 spin_lock(&br->multicast_lock);
662 if (!netif_running(br->dev) ||
663 (port && port->state == BR_STATE_DISABLED))
664 goto out;
665
666 mp = br_multicast_new_group(br, port, group);
667 err = PTR_ERR(mp);
4c0833bc 668 if (IS_ERR(mp))
eb1d1641
HX		 669 goto err;
670
671 if (!port) {
8a870178 672 mp->mglist = true;
eb1d1641
HX		 673 mod_timer(&mp->timer, now + br->multicast_membership_interval);
674 goto out;
675 }
676
e8051688
ED		 677 for (pp = &mp->ports;
678 (p = mlock_dereference(*pp, br)) != NULL;
679 pp = &p->next) {
eb1d1641
HX		 680 if (p->port == port)
681 goto found;
682 if ((unsigned long)p->port < (unsigned long)port)
683 break;
684 }
685
ccb1c31a 686 p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
eb1d1641
HX		 687 if (unlikely(!p))
688 goto err;
eb1d1641 689 rcu_assign_pointer(*pp, p);
37a393bc 690 br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
eb1d1641
HX		 691
692found:
693 mod_timer(&p->timer, now + br->multicast_membership_interval);
694out:
695 err = 0;
696
697err:
698 spin_unlock(&br->multicast_lock);
699 return err;
700}
701
8ef2a9a5
YH		 702static int br_ip4_multicast_add_group(struct net_bridge *br,
703 struct net_bridge_port *port,
b0e9a30d
VY		 704 __be32 group,
705 __u16 vid)
8ef2a9a5
YH		 706{
707 struct br_ip br_group;
708
709 if (ipv4_is_local_multicast(group))
710 return 0;
711
712 br_group.u.ip4 = group;
713 br_group.proto = htons(ETH_P_IP);
b0e9a30d 714 br_group.vid = vid;
8ef2a9a5
YH		 715
716 return br_multicast_add_group(br, port, &br_group);
717}
718
dfd56b8b 719#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 720static int br_ip6_multicast_add_group(struct net_bridge *br,
721 struct net_bridge_port *port,
b0e9a30d
VY		 722 const struct in6_addr *group,
723 __u16 vid)
08b202b6
YH		 724{
725 struct br_ip br_group;
726
e4de9f9e 727 if (!ipv6_is_transient_multicast(group))
08b202b6
YH		 728 return 0;
729
4e3fd7a0 730 br_group.u.ip6 = *group;
9cc6e0c4 731 br_group.proto = htons(ETH_P_IPV6);
b0e9a30d 732 br_group.vid = vid;
08b202b6
YH		 733
734 return br_multicast_add_group(br, port, &br_group);
735}
736#endif
737
eb1d1641
HX		 738static void br_multicast_router_expired(unsigned long data)
739{
740 struct net_bridge_port *port = (void *)data;
741 struct net_bridge *br = port->br;
742
743 spin_lock(&br->multicast_lock);
744 if (port->multicast_router != 1 ||
745 timer_pending(&port->multicast_router_timer) ||
746 hlist_unhashed(&port->rlist))
747 goto out;
748
749 hlist_del_init_rcu(&port->rlist);
750
751out:
752 spin_unlock(&br->multicast_lock);
753}
754
755static void br_multicast_local_router_expired(unsigned long data)
756{
757}
758
c83b8fab
HX		 759static void br_multicast_querier_expired(unsigned long data)
760{
bb63f1f8 761 struct net_bridge *br = (void *)data;
c83b8fab
HX		 762
763 spin_lock(&br->multicast_lock);
764 if (!netif_running(br->dev) || br->multicast_disabled)
765 goto out;
766
767 br_multicast_start_querier(br);
768
769out:
770 spin_unlock(&br->multicast_lock);
771}
772
8ef2a9a5
YH		 773static void __br_multicast_send_query(struct net_bridge *br,
774 struct net_bridge_port *port,
775 struct br_ip *ip)
eb1d1641 776{
eb1d1641
HX		 777 struct sk_buff *skb;
778
8ef2a9a5 779 skb = br_multicast_alloc_query(br, ip);
eb1d1641 780 if (!skb)
8ef2a9a5 781 return;
eb1d1641
HX		 782
783 if (port) {
784 __skb_push(skb, sizeof(struct ethhdr));
785 skb->dev = port->dev;
713aefa3 786 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
eb1d1641
HX		 787 dev_queue_xmit);
788 } else
789 netif_rx(skb);
8ef2a9a5
YH		 790}
791
792static void br_multicast_send_query(struct net_bridge *br,
793 struct net_bridge_port *port, u32 sent)
794{
795 unsigned long time;
796 struct br_ip br_group;
797
798 if (!netif_running(br->dev) || br->multicast_disabled ||
c5c23260 799 !br->multicast_querier ||
8ef2a9a5
YH		 800 timer_pending(&br->multicast_querier_timer))
801 return;
802
08b202b6
YH		 803 memset(&br_group.u, 0, sizeof(br_group.u));
804
8ef2a9a5 805 br_group.proto = htons(ETH_P_IP);
08b202b6 806 __br_multicast_send_query(br, port, &br_group);
8ef2a9a5 807
dfd56b8b 808#if IS_ENABLED(CONFIG_IPV6)
08b202b6 809 br_group.proto = htons(ETH_P_IPV6);
8ef2a9a5 810 __br_multicast_send_query(br, port, &br_group);
08b202b6 811#endif
eb1d1641 812
eb1d1641
HX		 813 time = jiffies;
814 time += sent < br->multicast_startup_query_count ?
815 br->multicast_startup_query_interval :
816 br->multicast_query_interval;
817 mod_timer(port ? &port->multicast_query_timer :
818 &br->multicast_query_timer, time);
819}
820
821static void br_multicast_port_query_expired(unsigned long data)
822{
823 struct net_bridge_port *port = (void *)data;
824 struct net_bridge *br = port->br;
825
826 spin_lock(&br->multicast_lock);
02a780c0
DC		 827 if (port->state == BR_STATE_DISABLED ||
828 port->state == BR_STATE_BLOCKING)
eb1d1641
HX		 829 goto out;
830
831 if (port->multicast_startup_queries_sent <
832 br->multicast_startup_query_count)
833 port->multicast_startup_queries_sent++;
834
835 br_multicast_send_query(port->br, port,
836 port->multicast_startup_queries_sent);
837
838out:
839 spin_unlock(&br->multicast_lock);
840}
841
842void br_multicast_add_port(struct net_bridge_port *port)
843{
844 port->multicast_router = 1;
845
846 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
847 (unsigned long)port);
848 setup_timer(&port->multicast_query_timer,
849 br_multicast_port_query_expired, (unsigned long)port);
850}
851
852void br_multicast_del_port(struct net_bridge_port *port)
853{
854 del_timer_sync(&port->multicast_router_timer);
855}
856
561f1103
HX		 857static void __br_multicast_enable_port(struct net_bridge_port *port)
858{
859 port->multicast_startup_queries_sent = 0;
860
861 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
862 del_timer(&port->multicast_query_timer))
863 mod_timer(&port->multicast_query_timer, jiffies);
864}
865
eb1d1641
HX		 866void br_multicast_enable_port(struct net_bridge_port *port)
867{
868 struct net_bridge *br = port->br;
869
870 spin_lock(&br->multicast_lock);
871 if (br->multicast_disabled || !netif_running(br->dev))
872 goto out;
873
561f1103 874 __br_multicast_enable_port(port);
eb1d1641
HX		 875
876out:
877 spin_unlock(&br->multicast_lock);
878}
879
880void br_multicast_disable_port(struct net_bridge_port *port)
881{
882 struct net_bridge *br = port->br;
883 struct net_bridge_port_group *pg;
b67bfe0d 884 struct hlist_node *n;
eb1d1641
HX		 885
886 spin_lock(&br->multicast_lock);
b67bfe0d 887 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
eb1d1641
HX		 888 br_multicast_del_pg(br, pg);
889
890 if (!hlist_unhashed(&port->rlist))
891 hlist_del_init_rcu(&port->rlist);
892 del_timer(&port->multicast_router_timer);
893 del_timer(&port->multicast_query_timer);
894 spin_unlock(&br->multicast_lock);
895}
896
8ef2a9a5
YH		 897static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
898 struct net_bridge_port *port,
899 struct sk_buff *skb)
eb1d1641
HX		 900{
901 struct igmpv3_report *ih;
902 struct igmpv3_grec *grec;
903 int i;
904 int len;
905 int num;
906 int type;
907 int err = 0;
908 __be32 group;
b0e9a30d 909 u16 vid = 0;
eb1d1641
HX		 910
911 if (!pskb_may_pull(skb, sizeof(*ih)))
912 return -EINVAL;
913
b0e9a30d 914 br_vlan_get_tag(skb, &vid);
eb1d1641
HX		 915 ih = igmpv3_report_hdr(skb);
916 num = ntohs(ih->ngrec);
917 len = sizeof(*ih);
918
919 for (i = 0; i < num; i++) {
920 len += sizeof(*grec);
921 if (!pskb_may_pull(skb, len))
922 return -EINVAL;
923
fd218cf9 924 grec = (void *)(skb->data + len - sizeof(*grec));
eb1d1641
HX		 925 group = grec->grec_mca;
926 type = grec->grec_type;
927
8eabf95c 928 len += ntohs(grec->grec_nsrcs) * 4;
eb1d1641
HX		 929 if (!pskb_may_pull(skb, len))
930 return -EINVAL;
931
932 /* We treat this as an IGMPv2 report for now. */
933 switch (type) {
934 case IGMPV3_MODE_IS_INCLUDE:
935 case IGMPV3_MODE_IS_EXCLUDE:
936 case IGMPV3_CHANGE_TO_INCLUDE:
937 case IGMPV3_CHANGE_TO_EXCLUDE:
938 case IGMPV3_ALLOW_NEW_SOURCES:
939 case IGMPV3_BLOCK_OLD_SOURCES:
940 break;
941
942 default:
943 continue;
944 }
945
b0e9a30d 946 err = br_ip4_multicast_add_group(br, port, group, vid);
eb1d1641
HX		 947 if (err)
948 break;
949 }
950
951 return err;
952}
953
dfd56b8b 954#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 955static int br_ip6_multicast_mld2_report(struct net_bridge *br,
956 struct net_bridge_port *port,
957 struct sk_buff *skb)
958{
959 struct icmp6hdr *icmp6h;
960 struct mld2_grec *grec;
961 int i;
962 int len;
963 int num;
964 int err = 0;
b0e9a30d 965 u16 vid = 0;
08b202b6
YH		 966
967 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
968 return -EINVAL;
969
b0e9a30d 970 br_vlan_get_tag(skb, &vid);
08b202b6
YH		 971 icmp6h = icmp6_hdr(skb);
972 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
973 len = sizeof(*icmp6h);
974
975 for (i = 0; i < num; i++) {
976 __be16 *nsrcs, _nsrcs;
977
978 nsrcs = skb_header_pointer(skb,
979 len + offsetof(struct mld2_grec,
649e984d 980 grec_nsrcs),
08b202b6
YH		 981 sizeof(_nsrcs), &_nsrcs);
982 if (!nsrcs)
983 return -EINVAL;
984
985 if (!pskb_may_pull(skb,
986 len + sizeof(*grec) +
d41db9f3 987 sizeof(struct in6_addr) * ntohs(*nsrcs)))
08b202b6
YH		 988 return -EINVAL;
989
990 grec = (struct mld2_grec *)(skb->data + len);
d41db9f3
LL		 991 len += sizeof(*grec) +
992 sizeof(struct in6_addr) * ntohs(*nsrcs);
08b202b6
YH		 993
994 /* We treat these as MLDv1 reports for now. */
995 switch (grec->grec_type) {
996 case MLD2_MODE_IS_INCLUDE:
997 case MLD2_MODE_IS_EXCLUDE:
998 case MLD2_CHANGE_TO_INCLUDE:
999 case MLD2_CHANGE_TO_EXCLUDE:
1000 case MLD2_ALLOW_NEW_SOURCES:
1001 case MLD2_BLOCK_OLD_SOURCES:
1002 break;
1003
1004 default:
1005 continue;
1006 }
1007
b0e9a30d
VY		 1008 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
1009 vid);
08b202b6
YH		 1010 if (!err)
1011 break;
1012 }
1013
1014 return err;
1015}
1016#endif
1017
7e80c124 1018/*
1019 * Add port to rotuer_list
1020 * list is maintained ordered by pointer value
1021 * and locked by br->multicast_lock and RCU
1022 */
0909e117
HX		 1023static void br_multicast_add_router(struct net_bridge *br,
1024 struct net_bridge_port *port)
1025{
dcdca2c4 1026 struct net_bridge_port *p;
b67bfe0d 1027 struct hlist_node *slot = NULL;
dcdca2c4 1028
b67bfe0d 1029 hlist_for_each_entry(p, &br->router_list, rlist) {
7e80c124 1030 if ((unsigned long) port >= (unsigned long) p)
1031 break;
b67bfe0d 1032 slot = &p->rlist;
dcdca2c4 1033 }
1034
7e80c124 1035 if (slot)
1036 hlist_add_after_rcu(slot, &port->rlist);
dcdca2c4 1037 else
1038 hlist_add_head_rcu(&port->rlist, &br->router_list);
0909e117
HX		 1039}
1040
eb1d1641
HX		 1041static void br_multicast_mark_router(struct net_bridge *br,
1042 struct net_bridge_port *port)
1043{
1044 unsigned long now = jiffies;
eb1d1641
HX		 1045
1046 if (!port) {
1047 if (br->multicast_router == 1)
1048 mod_timer(&br->multicast_router_timer,
1049 now + br->multicast_querier_interval);
1050 return;
1051 }
1052
1053 if (port->multicast_router != 1)
1054 return;
1055
1056 if (!hlist_unhashed(&port->rlist))
1057 goto timer;
1058
0909e117 1059 br_multicast_add_router(br, port);
eb1d1641
HX		 1060
1061timer:
1062 mod_timer(&port->multicast_router_timer,
1063 now + br->multicast_querier_interval);
1064}
1065
1066static void br_multicast_query_received(struct net_bridge *br,
1067 struct net_bridge_port *port,
8ef2a9a5 1068 int saddr)
eb1d1641
HX		 1069{
1070 if (saddr)
1071 mod_timer(&br->multicast_querier_timer,
1072 jiffies + br->multicast_querier_interval);
1073 else if (timer_pending(&br->multicast_querier_timer))
1074 return;
1075
1076 br_multicast_mark_router(br, port);
1077}
1078
8ef2a9a5
YH		 1079static int br_ip4_multicast_query(struct net_bridge *br,
1080 struct net_bridge_port *port,
1081 struct sk_buff *skb)
eb1d1641 1082{
b71d1d42 1083 const struct iphdr *iph = ip_hdr(skb);
eb1d1641
HX		 1084 struct igmphdr *ih = igmp_hdr(skb);
1085 struct net_bridge_mdb_entry *mp;
1086 struct igmpv3_query *ih3;
1087 struct net_bridge_port_group *p;
e8051688 1088 struct net_bridge_port_group __rcu **pp;
eb1d1641
HX		 1089 unsigned long max_delay;
1090 unsigned long now = jiffies;
1091 __be32 group;
bec68ff1 1092 int err = 0;
b0e9a30d 1093 u16 vid = 0;
eb1d1641
HX		 1094
1095 spin_lock(&br->multicast_lock);
1096 if (!netif_running(br->dev) ||
1097 (port && port->state == BR_STATE_DISABLED))
1098 goto out;
1099
8ef2a9a5 1100 br_multicast_query_received(br, port, !!iph->saddr);
eb1d1641
HX		 1101
1102 group = ih->group;
1103
1104 if (skb->len == sizeof(*ih)) {
1105 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1106
1107 if (!max_delay) {
1108 max_delay = 10 * HZ;
1109 group = 0;
1110 }
1111 } else {
bec68ff1
YH		 1112 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1113 err = -EINVAL;
1114 goto out;
1115 }
eb1d1641
HX		 1116
1117 ih3 = igmpv3_query_hdr(skb);
1118 if (ih3->nsrcs)
bec68ff1 1119 goto out;
eb1d1641 1120
0ba8c9ec
YH		 1121 max_delay = ih3->code ?
1122 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
eb1d1641
HX		 1123 }
1124
1125 if (!group)
1126 goto out;
1127
b0e9a30d
VY		 1128 br_vlan_get_tag(skb, &vid);
1129 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
eb1d1641
HX		 1130 if (!mp)
1131 goto out;
1132
1133 max_delay *= br->multicast_last_member_count;
1134
8a870178 1135 if (mp->mglist &&
eb1d1641
HX		 1136 (timer_pending(&mp->timer) ?
1137 time_after(mp->timer.expires, now + max_delay) :
1138 try_to_del_timer_sync(&mp->timer) >= 0))
1139 mod_timer(&mp->timer, now + max_delay);
1140
e8051688
ED		 1141 for (pp = &mp->ports;
1142 (p = mlock_dereference(*pp, br)) != NULL;
1143 pp = &p->next) {
eb1d1641
HX		 1144 if (timer_pending(&p->timer) ?
1145 time_after(p->timer.expires, now + max_delay) :
1146 try_to_del_timer_sync(&p->timer) >= 0)
24f9cdcb 1147 mod_timer(&p->timer, now + max_delay);
eb1d1641
HX		 1148 }
1149
1150out:
1151 spin_unlock(&br->multicast_lock);
bec68ff1 1152 return err;
eb1d1641
HX		 1153}
1154
dfd56b8b 1155#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1156static int br_ip6_multicast_query(struct net_bridge *br,
1157 struct net_bridge_port *port,
1158 struct sk_buff *skb)
1159{
b71d1d42 1160 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
eca2a43b 1161 struct mld_msg *mld;
08b202b6
YH		 1162 struct net_bridge_mdb_entry *mp;
1163 struct mld2_query *mld2q;
e8051688
ED		 1164 struct net_bridge_port_group *p;
1165 struct net_bridge_port_group __rcu **pp;
08b202b6
YH		 1166 unsigned long max_delay;
1167 unsigned long now = jiffies;
b71d1d42 1168 const struct in6_addr *group = NULL;
08b202b6 1169 int err = 0;
b0e9a30d 1170 u16 vid = 0;
08b202b6
YH		 1171
1172 spin_lock(&br->multicast_lock);
1173 if (!netif_running(br->dev) ||
1174 (port && port->state == BR_STATE_DISABLED))
1175 goto out;
1176
1177 br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr));
1178
1179 if (skb->len == sizeof(*mld)) {
1180 if (!pskb_may_pull(skb, sizeof(*mld))) {
1181 err = -EINVAL;
1182 goto out;
1183 }
1184 mld = (struct mld_msg *) icmp6_hdr(skb);
4715213d 1185 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
08b202b6
YH		 1186 if (max_delay)
1187 group = &mld->mld_mca;
5ddf7717 1188 } else {
08b202b6
YH		 1189 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1190 err = -EINVAL;
1191 goto out;
1192 }
1193 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1194 if (!mld2q->mld2q_nsrcs)
1195 group = &mld2q->mld2q_mca;
00897feb
DB		 1196
1197 max_delay = max(msecs_to_jiffies(MLDV2_MRC(ntohs(mld2q->mld2q_mrc))), 1UL);
08b202b6
YH		 1198 }
1199
1200 if (!group)
1201 goto out;
1202
b0e9a30d
VY		 1203 br_vlan_get_tag(skb, &vid);
1204 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
08b202b6
YH		 1205 if (!mp)
1206 goto out;
1207
1208 max_delay *= br->multicast_last_member_count;
8a870178 1209 if (mp->mglist &&
08b202b6
YH		 1210 (timer_pending(&mp->timer) ?
1211 time_after(mp->timer.expires, now + max_delay) :
1212 try_to_del_timer_sync(&mp->timer) >= 0))
1213 mod_timer(&mp->timer, now + max_delay);
1214
e8051688
ED		 1215 for (pp = &mp->ports;
1216 (p = mlock_dereference(*pp, br)) != NULL;
1217 pp = &p->next) {
08b202b6
YH		 1218 if (timer_pending(&p->timer) ?
1219 time_after(p->timer.expires, now + max_delay) :
1220 try_to_del_timer_sync(&p->timer) >= 0)
24f9cdcb 1221 mod_timer(&p->timer, now + max_delay);
08b202b6
YH		 1222 }
1223
1224out:
1225 spin_unlock(&br->multicast_lock);
1226 return err;
1227}
1228#endif
1229
eb1d1641
HX		 1230static void br_multicast_leave_group(struct net_bridge *br,
1231 struct net_bridge_port *port,
8ef2a9a5 1232 struct br_ip *group)
eb1d1641
HX		 1233{
1234 struct net_bridge_mdb_htable *mdb;
1235 struct net_bridge_mdb_entry *mp;
1236 struct net_bridge_port_group *p;
1237 unsigned long now;
1238 unsigned long time;
1239
eb1d1641
HX		 1240 spin_lock(&br->multicast_lock);
1241 if (!netif_running(br->dev) ||
1242 (port && port->state == BR_STATE_DISABLED) ||
1243 timer_pending(&br->multicast_querier_timer))
1244 goto out;
1245
e8051688 1246 mdb = mlock_dereference(br->mdb, br);
eb1d1641
HX		 1247 mp = br_mdb_ip_get(mdb, group);
1248 if (!mp)
1249 goto out;
1250
c2d3babf 1251 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
50426b59
AW		 1252 struct net_bridge_port_group __rcu **pp;
1253
1254 for (pp = &mp->ports;
1255 (p = mlock_dereference(*pp, br)) != NULL;
1256 pp = &p->next) {
1257 if (p->port != port)
1258 continue;
1259
1260 rcu_assign_pointer(*pp, p->next);
1261 hlist_del_init(&p->mglist);
1262 del_timer(&p->timer);
1263 call_rcu_bh(&p->rcu, br_multicast_free_pg);
37a393bc 1264 br_mdb_notify(br->dev, port, group, RTM_DELMDB);
50426b59
AW		 1265
1266 if (!mp->ports && !mp->mglist &&
1267 netif_running(br->dev))
1268 mod_timer(&mp->timer, jiffies);
1269 }
1270 goto out;
1271 }
1272
eb1d1641
HX		 1273 now = jiffies;
1274 time = now + br->multicast_last_member_count *
1275 br->multicast_last_member_interval;
1276
1277 if (!port) {
8a870178 1278 if (mp->mglist &&
eb1d1641
HX		 1279 (timer_pending(&mp->timer) ?
1280 time_after(mp->timer.expires, time) :
1281 try_to_del_timer_sync(&mp->timer) >= 0)) {
1282 mod_timer(&mp->timer, time);
eb1d1641
HX		 1283 }
1284
1285 goto out;
1286 }
1287
e8051688
ED		 1288 for (p = mlock_dereference(mp->ports, br);
1289 p != NULL;
1290 p = mlock_dereference(p->next, br)) {
eb1d1641
HX		 1291 if (p->port != port)
1292 continue;
1293
1294 if (!hlist_unhashed(&p->mglist) &&
1295 (timer_pending(&p->timer) ?
1296 time_after(p->timer.expires, time) :
1297 try_to_del_timer_sync(&p->timer) >= 0)) {
1298 mod_timer(&p->timer, time);
eb1d1641
HX		 1299 }
1300
1301 break;
1302 }
1303
1304out:
1305 spin_unlock(&br->multicast_lock);
1306}
1307
8ef2a9a5
YH		 1308static void br_ip4_multicast_leave_group(struct net_bridge *br,
1309 struct net_bridge_port *port,
b0e9a30d
VY		 1310 __be32 group,
1311 __u16 vid)
8ef2a9a5
YH		 1312{
1313 struct br_ip br_group;
1314
1315 if (ipv4_is_local_multicast(group))
1316 return;
1317
1318 br_group.u.ip4 = group;
1319 br_group.proto = htons(ETH_P_IP);
b0e9a30d 1320 br_group.vid = vid;
8ef2a9a5
YH		 1321
1322 br_multicast_leave_group(br, port, &br_group);
1323}
1324
dfd56b8b 1325#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1326static void br_ip6_multicast_leave_group(struct net_bridge *br,
1327 struct net_bridge_port *port,
b0e9a30d
VY		 1328 const struct in6_addr *group,
1329 __u16 vid)
08b202b6
YH		 1330{
1331 struct br_ip br_group;
1332
e4de9f9e 1333 if (!ipv6_is_transient_multicast(group))
08b202b6
YH		 1334 return;
1335
4e3fd7a0 1336 br_group.u.ip6 = *group;
08b202b6 1337 br_group.proto = htons(ETH_P_IPV6);
b0e9a30d 1338 br_group.vid = vid;
08b202b6
YH		 1339
1340 br_multicast_leave_group(br, port, &br_group);
1341}
1342#endif
8ef2a9a5 1343
eb1d1641
HX		 1344static int br_multicast_ipv4_rcv(struct net_bridge *br,
1345 struct net_bridge_port *port,
1346 struct sk_buff *skb)
1347{
1348 struct sk_buff *skb2 = skb;
b71d1d42 1349 const struct iphdr *iph;
eb1d1641 1350 struct igmphdr *ih;
95c96174
ED		 1351 unsigned int len;
1352 unsigned int offset;
eb1d1641 1353 int err;
b0e9a30d 1354 u16 vid = 0;
eb1d1641 1355
eb1d1641
HX		 1356 /* We treat OOM as packet loss for now. */
1357 if (!pskb_may_pull(skb, sizeof(*iph)))
1358 return -EINVAL;
1359
1360 iph = ip_hdr(skb);
1361
1362 if (iph->ihl < 5 || iph->version != 4)
1363 return -EINVAL;
1364
1365 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1366 return -EINVAL;
1367
1368 iph = ip_hdr(skb);
1369
1370 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1371 return -EINVAL;
1372
bd4265fe 1373 if (iph->protocol != IPPROTO_IGMP) {
bf5e4dd6 1374 if (!ipv4_is_local_multicast(iph->daddr))
bd4265fe 1375 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
eb1d1641 1376 return 0;
bd4265fe 1377 }
eb1d1641
HX		 1378
1379 len = ntohs(iph->tot_len);
1380 if (skb->len < len || len < ip_hdrlen(skb))
1381 return -EINVAL;
1382
1383 if (skb->len > len) {
1384 skb2 = skb_clone(skb, GFP_ATOMIC);
1385 if (!skb2)
1386 return -ENOMEM;
1387
1388 err = pskb_trim_rcsum(skb2, len);
1389 if (err)
8440853b 1390 goto err_out;
eb1d1641
HX		 1391 }
1392
1393 len -= ip_hdrlen(skb2);
1394 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1395 __skb_pull(skb2, offset);
1396 skb_reset_transport_header(skb2);
1397
1398 err = -EINVAL;
1399 if (!pskb_may_pull(skb2, sizeof(*ih)))
1400 goto out;
1401
eb1d1641
HX		 1402 switch (skb2->ip_summed) {
1403 case CHECKSUM_COMPLETE:
1404 if (!csum_fold(skb2->csum))
1405 break;
1406 /* fall through */
1407 case CHECKSUM_NONE:
1408 skb2->csum = 0;
1409 if (skb_checksum_complete(skb2))
8440853b 1410 goto out;
eb1d1641
HX		 1411 }
1412
1413 err = 0;
1414
b0e9a30d 1415 br_vlan_get_tag(skb2, &vid);
eb1d1641
HX		 1416 BR_INPUT_SKB_CB(skb)->igmp = 1;
1417 ih = igmp_hdr(skb2);
1418
1419 switch (ih->type) {
1420 case IGMP_HOST_MEMBERSHIP_REPORT:
1421 case IGMPV2_HOST_MEMBERSHIP_REPORT:
62b2bcb4 1422 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
b0e9a30d 1423 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
eb1d1641
HX		 1424 break;
1425 case IGMPV3_HOST_MEMBERSHIP_REPORT:
8ef2a9a5 1426 err = br_ip4_multicast_igmp3_report(br, port, skb2);
eb1d1641
HX		 1427 break;
1428 case IGMP_HOST_MEMBERSHIP_QUERY:
8ef2a9a5 1429 err = br_ip4_multicast_query(br, port, skb2);
eb1d1641
HX		 1430 break;
1431 case IGMP_HOST_LEAVE_MESSAGE:
b0e9a30d 1432 br_ip4_multicast_leave_group(br, port, ih->group, vid);
eb1d1641
HX		 1433 break;
1434 }
1435
1436out:
1437 __skb_push(skb2, offset);
8440853b 1438err_out:
eb1d1641
HX		 1439 if (skb2 != skb)
1440 kfree_skb(skb2);
1441 return err;
1442}
1443
dfd56b8b 1444#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1445static int br_multicast_ipv6_rcv(struct net_bridge *br,
1446 struct net_bridge_port *port,
1447 struct sk_buff *skb)
1448{
9d89081d 1449 struct sk_buff *skb2;
b71d1d42 1450 const struct ipv6hdr *ip6h;
22df1331 1451 u8 icmp6_type;
08b202b6 1452 u8 nexthdr;
75f2811c 1453 __be16 frag_off;
95c96174 1454 unsigned int len;
bb7a0bd6 1455 int offset;
08b202b6 1456 int err;
b0e9a30d 1457 u16 vid = 0;
08b202b6 1458
08b202b6
YH		 1459 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1460 return -EINVAL;
1461
1462 ip6h = ipv6_hdr(skb);
1463
1464 /*
1465 * We're interested in MLD messages only.
1466 * - Version is 6
1467 * - MLD has always Router Alert hop-by-hop option
1468 * - But we do not support jumbrograms.
1469 */
1470 if (ip6h->version != 6 ||
1471 ip6h->nexthdr != IPPROTO_HOPOPTS ||
1472 ip6h->payload_len == 0)
1473 return 0;
1474
ff9a57a6 1475 len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
08b202b6
YH		 1476 if (skb->len < len)
1477 return -EINVAL;
1478
1479 nexthdr = ip6h->nexthdr;
75f2811c 1480 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
08b202b6
YH		 1481
1482 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1483 return 0;
1484
1485 /* Okay, we found ICMPv6 header */
1486 skb2 = skb_clone(skb, GFP_ATOMIC);
1487 if (!skb2)
1488 return -ENOMEM;
1489
9d89081d
TW		 1490 err = -EINVAL;
1491 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1492 goto out;
1493
08b202b6
YH		 1494 len -= offset - skb_network_offset(skb2);
1495
1496 __skb_pull(skb2, offset);
1497 skb_reset_transport_header(skb2);
fa2da8cd 1498 skb_postpull_rcsum(skb2, skb_network_header(skb2),
1499 skb_network_header_len(skb2));
08b202b6 1500
22df1331 1501 icmp6_type = icmp6_hdr(skb2)->icmp6_type;
08b202b6 1502
22df1331 1503 switch (icmp6_type) {
08b202b6
YH		 1504 case ICMPV6_MGM_QUERY:
1505 case ICMPV6_MGM_REPORT:
1506 case ICMPV6_MGM_REDUCTION:
1507 case ICMPV6_MLD2_REPORT:
1508 break;
1509 default:
1510 err = 0;
1511 goto out;
1512 }
1513
1514 /* Okay, we found MLD message. Check further. */
1515 if (skb2->len > len) {
1516 err = pskb_trim_rcsum(skb2, len);
1517 if (err)
1518 goto out;
4b275d7e 1519 err = -EINVAL;
08b202b6
YH		 1520 }
1521
4b275d7e
YZ		 1522 ip6h = ipv6_hdr(skb2);
1523
08b202b6
YH		 1524 switch (skb2->ip_summed) {
1525 case CHECKSUM_COMPLETE:
4b275d7e
YZ		 1526 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
1527 IPPROTO_ICMPV6, skb2->csum))
08b202b6
YH		 1528 break;
1529 /*FALLTHROUGH*/
1530 case CHECKSUM_NONE:
4b275d7e
YZ		 1531 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
1532 &ip6h->daddr,
1533 skb2->len,
1534 IPPROTO_ICMPV6, 0));
1535 if (__skb_checksum_complete(skb2))
08b202b6
YH		 1536 goto out;
1537 }
1538
1539 err = 0;
1540
b0e9a30d 1541 br_vlan_get_tag(skb, &vid);
08b202b6
YH		 1542 BR_INPUT_SKB_CB(skb)->igmp = 1;
1543
22df1331 1544 switch (icmp6_type) {
08b202b6
YH		 1545 case ICMPV6_MGM_REPORT:
1546 {
9d89081d
TW		 1547 struct mld_msg *mld;
1548 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1549 err = -EINVAL;
1550 goto out;
1551 }
1552 mld = (struct mld_msg *)skb_transport_header(skb2);
fc2af6c7 1553 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
b0e9a30d 1554 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
08b202b6
YH		 1555 break;
1556 }
1557 case ICMPV6_MLD2_REPORT:
1558 err = br_ip6_multicast_mld2_report(br, port, skb2);
1559 break;
1560 case ICMPV6_MGM_QUERY:
1561 err = br_ip6_multicast_query(br, port, skb2);
1562 break;
1563 case ICMPV6_MGM_REDUCTION:
1564 {
9d89081d
TW		 1565 struct mld_msg *mld;
1566 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1567 err = -EINVAL;
1568 goto out;
1569 }
1570 mld = (struct mld_msg *)skb_transport_header(skb2);
b0e9a30d 1571 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
08b202b6
YH		 1572 }
1573 }
1574
1575out:
9d89081d 1576 kfree_skb(skb2);
08b202b6
YH		 1577 return err;
1578}
1579#endif
1580
eb1d1641
HX		 1581int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1582 struct sk_buff *skb)
1583{
1fafc7a9
YH		 1584 BR_INPUT_SKB_CB(skb)->igmp = 0;
1585 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1586
eb1d1641
HX		 1587 if (br->multicast_disabled)
1588 return 0;
1589
1590 switch (skb->protocol) {
1591 case htons(ETH_P_IP):
1592 return br_multicast_ipv4_rcv(br, port, skb);
dfd56b8b 1593#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1594 case htons(ETH_P_IPV6):
1595 return br_multicast_ipv6_rcv(br, port, skb);
1596#endif
eb1d1641
HX		 1597 }
1598
1599 return 0;
1600}
1601
1602static void br_multicast_query_expired(unsigned long data)
1603{
1604 struct net_bridge *br = (void *)data;
1605
1606 spin_lock(&br->multicast_lock);
1607 if (br->multicast_startup_queries_sent <
1608 br->multicast_startup_query_count)
1609 br->multicast_startup_queries_sent++;
1610
1611 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
1612
1613 spin_unlock(&br->multicast_lock);
1614}
1615
1616void br_multicast_init(struct net_bridge *br)
1617{
1618 br->hash_elasticity = 4;
1619 br->hash_max = 512;
1620
1621 br->multicast_router = 1;
c5c23260 1622 br->multicast_querier = 0;
eb1d1641
HX		 1623 br->multicast_last_member_count = 2;
1624 br->multicast_startup_query_count = 2;
1625
1626 br->multicast_last_member_interval = HZ;
1627 br->multicast_query_response_interval = 10 * HZ;
1628 br->multicast_startup_query_interval = 125 * HZ / 4;
1629 br->multicast_query_interval = 125 * HZ;
1630 br->multicast_querier_interval = 255 * HZ;
1631 br->multicast_membership_interval = 260 * HZ;
1632
1633 spin_lock_init(&br->multicast_lock);
1634 setup_timer(&br->multicast_router_timer,
1635 br_multicast_local_router_expired, 0);
1636 setup_timer(&br->multicast_querier_timer,
bb63f1f8 1637 br_multicast_querier_expired, (unsigned long)br);
eb1d1641
HX		 1638 setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
1639 (unsigned long)br);
1640}
1641
1642void br_multicast_open(struct net_bridge *br)
1643{
1644 br->multicast_startup_queries_sent = 0;
1645
1646 if (br->multicast_disabled)
1647 return;
1648
1649 mod_timer(&br->multicast_query_timer, jiffies);
1650}
1651
1652void br_multicast_stop(struct net_bridge *br)
1653{
1654 struct net_bridge_mdb_htable *mdb;
1655 struct net_bridge_mdb_entry *mp;
b67bfe0d 1656 struct hlist_node *n;
eb1d1641
HX		 1657 u32 ver;
1658 int i;
1659
1660 del_timer_sync(&br->multicast_router_timer);
1661 del_timer_sync(&br->multicast_querier_timer);
1662 del_timer_sync(&br->multicast_query_timer);
1663
1664 spin_lock_bh(&br->multicast_lock);
e8051688 1665 mdb = mlock_dereference(br->mdb, br);
eb1d1641
HX		 1666 if (!mdb)
1667 goto out;
1668
1669 br->mdb = NULL;
1670
1671 ver = mdb->ver;
1672 for (i = 0; i < mdb->max; i++) {
b67bfe0d 1673 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
eb1d1641
HX		 1674 hlist[ver]) {
1675 del_timer(&mp->timer);
eb1d1641
HX		 1676 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1677 }
1678 }
1679
1680 if (mdb->old) {
1681 spin_unlock_bh(&br->multicast_lock);
10cc2b50 1682 rcu_barrier_bh();
eb1d1641
HX		 1683 spin_lock_bh(&br->multicast_lock);
1684 WARN_ON(mdb->old);
1685 }
1686
1687 mdb->old = mdb;
1688 call_rcu_bh(&mdb->rcu, br_mdb_free);
1689
1690out:
1691 spin_unlock_bh(&br->multicast_lock);
1692}
0909e117
HX		 1693
1694int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1695{
1696 int err = -ENOENT;
1697
1698 spin_lock_bh(&br->multicast_lock);
1699 if (!netif_running(br->dev))
1700 goto unlock;
1701
1702 switch (val) {
1703 case 0:
1704 case 2:
1705 del_timer(&br->multicast_router_timer);
1706 /* fall through */
1707 case 1:
1708 br->multicast_router = val;
1709 err = 0;
1710 break;
1711
1712 default:
1713 err = -EINVAL;
1714 break;
1715 }
1716
1717unlock:
1718 spin_unlock_bh(&br->multicast_lock);
1719
1720 return err;
1721}
1722
1723int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1724{
1725 struct net_bridge *br = p->br;
1726 int err = -ENOENT;
1727
1728 spin_lock(&br->multicast_lock);
1729 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1730 goto unlock;
1731
1732 switch (val) {
1733 case 0:
1734 case 1:
1735 case 2:
1736 p->multicast_router = val;
1737 err = 0;
1738
1739 if (val < 2 && !hlist_unhashed(&p->rlist))
1740 hlist_del_init_rcu(&p->rlist);
1741
1742 if (val == 1)
1743 break;
1744
1745 del_timer(&p->multicast_router_timer);
1746
1747 if (val == 0)
1748 break;
1749
1750 br_multicast_add_router(br, p);
1751 break;
1752
1753 default:
1754 err = -EINVAL;
1755 break;
1756 }
1757
1758unlock:
1759 spin_unlock(&br->multicast_lock);
1760
1761 return err;
1762}
561f1103 1763
74857216 1764static void br_multicast_start_querier(struct net_bridge *br)
561f1103
HX		 1765{
1766 struct net_bridge_port *port;
74857216
HX		 1767
1768 br_multicast_open(br);
1769
1770 list_for_each_entry(port, &br->port_list, list) {
1771 if (port->state == BR_STATE_DISABLED ||
1772 port->state == BR_STATE_BLOCKING)
1773 continue;
1774
1775 __br_multicast_enable_port(port);
1776 }
1777}
1778
1779int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1780{
3a7fda06 1781 int err = 0;
e8051688 1782 struct net_bridge_mdb_htable *mdb;
561f1103 1783
ef5e0d82 1784 spin_lock_bh(&br->multicast_lock);
561f1103
HX		 1785 if (br->multicast_disabled == !val)
1786 goto unlock;
1787
1788 br->multicast_disabled = !val;
1789 if (br->multicast_disabled)
1790 goto unlock;
1791
3a7fda06
HX		 1792 if (!netif_running(br->dev))
1793 goto unlock;
1794
e8051688
ED		 1795 mdb = mlock_dereference(br->mdb, br);
1796 if (mdb) {
1797 if (mdb->old) {
561f1103
HX		 1798 err = -EEXIST;
1799rollback:
1800 br->multicast_disabled = !!val;
1801 goto unlock;
1802 }
1803
e8051688 1804 err = br_mdb_rehash(&br->mdb, mdb->max,
561f1103
HX		 1805 br->hash_elasticity);
1806 if (err)
1807 goto rollback;
1808 }
1809
74857216 1810 br_multicast_start_querier(br);
561f1103
HX		 1811
1812unlock:
ef5e0d82 1813 spin_unlock_bh(&br->multicast_lock);
561f1103
HX		 1814
1815 return err;
1816}
b195167f 1817
c5c23260
HX		 1818int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1819{
1820 val = !!val;
1821
1822 spin_lock_bh(&br->multicast_lock);
1823 if (br->multicast_querier == val)
1824 goto unlock;
1825
1826 br->multicast_querier = val;
1827 if (val)
1828 br_multicast_start_querier(br);
1829
1830unlock:
1831 spin_unlock_bh(&br->multicast_lock);
1832
1833 return 0;
1834}
1835
b195167f
HX		 1836int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1837{
1838 int err = -ENOENT;
1839 u32 old;
e8051688 1840 struct net_bridge_mdb_htable *mdb;
b195167f
HX		 1841
1842 spin_lock(&br->multicast_lock);
1843 if (!netif_running(br->dev))
1844 goto unlock;
1845
1846 err = -EINVAL;
1847 if (!is_power_of_2(val))
1848 goto unlock;
e8051688
ED		 1849
1850 mdb = mlock_dereference(br->mdb, br);
1851 if (mdb && val < mdb->size)
b195167f
HX		 1852 goto unlock;
1853
1854 err = 0;
1855
1856 old = br->hash_max;
1857 br->hash_max = val;
1858
e8051688
ED		 1859 if (mdb) {
1860 if (mdb->old) {
b195167f
HX		 1861 err = -EEXIST;
1862rollback:
1863 br->hash_max = old;
1864 goto unlock;
1865 }
1866
1867 err = br_mdb_rehash(&br->mdb, br->hash_max,
1868 br->hash_elasticity);
1869 if (err)
1870 goto rollback;
1871 }
1872
1873unlock:
1874 spin_unlock(&br->multicast_lock);
1875
1876 return err;
1877}
kernel source for telekom puls (alcatel/mediatek)