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x86/mm: Add TLB purge to free pmd/pte page interfaces
[linux/fpc-iii.git] / net / bridge / br_multicast.c
blob2136e45f5277764264c181b201664822edef4c17
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/export.h>
15 #include <linux/if_ether.h>
16 #include <linux/igmp.h>
17 #include <linux/jhash.h>
18 #include <linux/kernel.h>
19 #include <linux/log2.h>
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>
27 #include <linux/inetdevice.h>
28 #include <net/ip.h>
29 #if IS_ENABLED(CONFIG_IPV6)
30 #include <net/ipv6.h>
31 #include <net/mld.h>
32 #include <net/ip6_checksum.h>
33 #include <net/addrconf.h>
34 #endif
35
36 #include "br_private.h"
37
38 static void br_multicast_start_querier(struct net_bridge *br,
39 struct bridge_mcast_own_query *query);
40 static void br_multicast_add_router(struct net_bridge *br,
41 struct net_bridge_port *port);
42 static void br_ip4_multicast_leave_group(struct net_bridge *br,
43 struct net_bridge_port *port,
44 __be32 group,
45 __u16 vid);
46 #if IS_ENABLED(CONFIG_IPV6)
47 static void br_ip6_multicast_leave_group(struct net_bridge *br,
48 struct net_bridge_port *port,
49 const struct in6_addr *group,
50 __u16 vid);
51 #endif
52 unsigned int br_mdb_rehash_seq;
53
54 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
55 {
56 if (a->proto != b->proto)
57 return 0;
58 if (a->vid != b->vid)
59 return 0;
60 switch (a->proto) {
61 case htons(ETH_P_IP):
62 return a->u.ip4 == b->u.ip4;
63 #if IS_ENABLED(CONFIG_IPV6)
64 case htons(ETH_P_IPV6):
65 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
66 #endif
67 }
68 return 0;
69 }
70
71 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
72 __u16 vid)
73 {
74 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
75 }
76
77 #if IS_ENABLED(CONFIG_IPV6)
78 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
79 const struct in6_addr *ip,
80 __u16 vid)
81 {
82 return jhash_2words(ipv6_addr_hash(ip), vid,
83 mdb->secret) & (mdb->max - 1);
84 }
85 #endif
86
87 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
88 struct br_ip *ip)
89 {
90 switch (ip->proto) {
91 case htons(ETH_P_IP):
92 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
93 #if IS_ENABLED(CONFIG_IPV6)
94 case htons(ETH_P_IPV6):
95 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
96 #endif
97 }
98 return 0;
99 }
100
101 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
102 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
103 {
104 struct net_bridge_mdb_entry *mp;
105
106 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
107 if (br_ip_equal(&mp->addr, dst))
108 return mp;
109 }
110
111 return NULL;
112 }
113
114 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
115 struct br_ip *dst)
116 {
117 if (!mdb)
118 return NULL;
119
120 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
121 }
122
123 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
124 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
125 {
126 struct br_ip br_dst;
127
128 br_dst.u.ip4 = dst;
129 br_dst.proto = htons(ETH_P_IP);
130 br_dst.vid = vid;
131
132 return br_mdb_ip_get(mdb, &br_dst);
133 }
134
135 #if IS_ENABLED(CONFIG_IPV6)
136 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
137 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
138 __u16 vid)
139 {
140 struct br_ip br_dst;
141
142 br_dst.u.ip6 = *dst;
143 br_dst.proto = htons(ETH_P_IPV6);
144 br_dst.vid = vid;
145
146 return br_mdb_ip_get(mdb, &br_dst);
147 }
148 #endif
149
150 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
151 struct sk_buff *skb, u16 vid)
152 {
153 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
154 struct br_ip ip;
155
156 if (br->multicast_disabled)
157 return NULL;
158
159 if (BR_INPUT_SKB_CB(skb)->igmp)
160 return NULL;
161
162 ip.proto = skb->protocol;
163 ip.vid = vid;
164
165 switch (skb->protocol) {
166 case htons(ETH_P_IP):
167 ip.u.ip4 = ip_hdr(skb)->daddr;
168 break;
169 #if IS_ENABLED(CONFIG_IPV6)
170 case htons(ETH_P_IPV6):
171 ip.u.ip6 = ipv6_hdr(skb)->daddr;
172 break;
173 #endif
174 default:
175 return NULL;
176 }
177
178 return br_mdb_ip_get(mdb, &ip);
179 }
180
181 static void br_mdb_free(struct rcu_head *head)
182 {
183 struct net_bridge_mdb_htable *mdb =
184 container_of(head, struct net_bridge_mdb_htable, rcu);
185 struct net_bridge_mdb_htable *old = mdb->old;
186
187 mdb->old = NULL;
188 kfree(old->mhash);
189 kfree(old);
190 }
191
192 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
193 struct net_bridge_mdb_htable *old,
194 int elasticity)
195 {
196 struct net_bridge_mdb_entry *mp;
197 int maxlen;
198 int len;
199 int i;
200
201 for (i = 0; i < old->max; i++)
202 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
203 hlist_add_head(&mp->hlist[new->ver],
204 &new->mhash[br_ip_hash(new, &mp->addr)]);
205
206 if (!elasticity)
207 return 0;
208
209 maxlen = 0;
210 for (i = 0; i < new->max; i++) {
211 len = 0;
212 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
213 len++;
214 if (len > maxlen)
215 maxlen = len;
216 }
217
218 return maxlen > elasticity ? -EINVAL : 0;
219 }
220
221 void br_multicast_free_pg(struct rcu_head *head)
222 {
223 struct net_bridge_port_group *p =
224 container_of(head, struct net_bridge_port_group, rcu);
225
226 kfree(p);
227 }
228
229 static void br_multicast_free_group(struct rcu_head *head)
230 {
231 struct net_bridge_mdb_entry *mp =
232 container_of(head, struct net_bridge_mdb_entry, rcu);
233
234 kfree(mp);
235 }
236
237 static void br_multicast_group_expired(unsigned long data)
238 {
239 struct net_bridge_mdb_entry *mp = (void *)data;
240 struct net_bridge *br = mp->br;
241 struct net_bridge_mdb_htable *mdb;
242
243 spin_lock(&br->multicast_lock);
244 if (!netif_running(br->dev) || timer_pending(&mp->timer))
245 goto out;
246
247 mp->mglist = false;
248
249 if (mp->ports)
250 goto out;
251
252 mdb = mlock_dereference(br->mdb, br);
253
254 hlist_del_rcu(&mp->hlist[mdb->ver]);
255 mdb->size--;
256
257 call_rcu_bh(&mp->rcu, br_multicast_free_group);
258
259 out:
260 spin_unlock(&br->multicast_lock);
261 }
262
263 static void br_multicast_del_pg(struct net_bridge *br,
264 struct net_bridge_port_group *pg)
265 {
266 struct net_bridge_mdb_htable *mdb;
267 struct net_bridge_mdb_entry *mp;
268 struct net_bridge_port_group *p;
269 struct net_bridge_port_group __rcu **pp;
270
271 mdb = mlock_dereference(br->mdb, br);
272
273 mp = br_mdb_ip_get(mdb, &pg->addr);
274 if (WARN_ON(!mp))
275 return;
276
277 for (pp = &mp->ports;
278 (p = mlock_dereference(*pp, br)) != NULL;
279 pp = &p->next) {
280 if (p != pg)
281 continue;
282
283 rcu_assign_pointer(*pp, p->next);
284 hlist_del_init(&p->mglist);
285 del_timer(&p->timer);
286 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
287 p->flags);
288 call_rcu_bh(&p->rcu, br_multicast_free_pg);
289
290 if (!mp->ports && !mp->mglist &&
291 netif_running(br->dev))
292 mod_timer(&mp->timer, jiffies);
293
294 return;
295 }
296
297 WARN_ON(1);
298 }
299
300 static void br_multicast_port_group_expired(unsigned long data)
301 {
302 struct net_bridge_port_group *pg = (void *)data;
303 struct net_bridge *br = pg->port->br;
304
305 spin_lock(&br->multicast_lock);
306 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
307 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
308 goto out;
309
310 br_multicast_del_pg(br, pg);
311
312 out:
313 spin_unlock(&br->multicast_lock);
314 }
315
316 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
317 int elasticity)
318 {
319 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
320 struct net_bridge_mdb_htable *mdb;
321 int err;
322
323 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
324 if (!mdb)
325 return -ENOMEM;
326
327 mdb->max = max;
328 mdb->old = old;
329
330 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
331 if (!mdb->mhash) {
332 kfree(mdb);
333 return -ENOMEM;
334 }
335
336 mdb->size = old ? old->size : 0;
337 mdb->ver = old ? old->ver ^ 1 : 0;
338
339 if (!old || elasticity)
340 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
341 else
342 mdb->secret = old->secret;
343
344 if (!old)
345 goto out;
346
347 err = br_mdb_copy(mdb, old, elasticity);
348 if (err) {
349 kfree(mdb->mhash);
350 kfree(mdb);
351 return err;
352 }
353
354 br_mdb_rehash_seq++;
355 call_rcu_bh(&mdb->rcu, br_mdb_free);
356
357 out:
358 rcu_assign_pointer(*mdbp, mdb);
359
360 return 0;
361 }
362
363 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
364 __be32 group,
365 u8 *igmp_type)
366 {
367 struct sk_buff *skb;
368 struct igmphdr *ih;
369 struct ethhdr *eth;
370 struct iphdr *iph;
371
372 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
373 sizeof(*ih) + 4);
374 if (!skb)
375 goto out;
376
377 skb->protocol = htons(ETH_P_IP);
378
379 skb_reset_mac_header(skb);
380 eth = eth_hdr(skb);
381
382 ether_addr_copy(eth->h_source, br->dev->dev_addr);
383 eth->h_dest[0] = 1;
384 eth->h_dest[1] = 0;
385 eth->h_dest[2] = 0x5e;
386 eth->h_dest[3] = 0;
387 eth->h_dest[4] = 0;
388 eth->h_dest[5] = 1;
389 eth->h_proto = htons(ETH_P_IP);
390 skb_put(skb, sizeof(*eth));
391
392 skb_set_network_header(skb, skb->len);
393 iph = ip_hdr(skb);
394
395 iph->version = 4;
396 iph->ihl = 6;
397 iph->tos = 0xc0;
398 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
399 iph->id = 0;
400 iph->frag_off = htons(IP_DF);
401 iph->ttl = 1;
402 iph->protocol = IPPROTO_IGMP;
403 iph->saddr = br->multicast_query_use_ifaddr ?
404 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
405 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
406 ((u8 *)&iph[1])[0] = IPOPT_RA;
407 ((u8 *)&iph[1])[1] = 4;
408 ((u8 *)&iph[1])[2] = 0;
409 ((u8 *)&iph[1])[3] = 0;
410 ip_send_check(iph);
411 skb_put(skb, 24);
412
413 skb_set_transport_header(skb, skb->len);
414 ih = igmp_hdr(skb);
415 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
416 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
417 ih->code = (group ? br->multicast_last_member_interval :
418 br->multicast_query_response_interval) /
419 (HZ / IGMP_TIMER_SCALE);
420 ih->group = group;
421 ih->csum = 0;
422 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
423 skb_put(skb, sizeof(*ih));
424
425 __skb_pull(skb, sizeof(*eth));
426
427 out:
428 return skb;
429 }
430
431 #if IS_ENABLED(CONFIG_IPV6)
432 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
433 const struct in6_addr *grp,
434 u8 *igmp_type)
435 {
436 struct sk_buff *skb;
437 struct ipv6hdr *ip6h;
438 struct mld_msg *mldq;
439 struct ethhdr *eth;
440 u8 *hopopt;
441 unsigned long interval;
442
443 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
444 8 + sizeof(*mldq));
445 if (!skb)
446 goto out;
447
448 skb->protocol = htons(ETH_P_IPV6);
449
450 /* Ethernet header */
451 skb_reset_mac_header(skb);
452 eth = eth_hdr(skb);
453
454 ether_addr_copy(eth->h_source, br->dev->dev_addr);
455 eth->h_proto = htons(ETH_P_IPV6);
456 skb_put(skb, sizeof(*eth));
457
458 /* IPv6 header + HbH option */
459 skb_set_network_header(skb, skb->len);
460 ip6h = ipv6_hdr(skb);
461
462 *(__force __be32 *)ip6h = htonl(0x60000000);
463 ip6h->payload_len = htons(8 + sizeof(*mldq));
464 ip6h->nexthdr = IPPROTO_HOPOPTS;
465 ip6h->hop_limit = 1;
466 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
467 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
468 &ip6h->saddr)) {
469 kfree_skb(skb);
470 br->has_ipv6_addr = 0;
471 return NULL;
472 }
473
474 br->has_ipv6_addr = 1;
475 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
476
477 hopopt = (u8 *)(ip6h + 1);
478 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
479 hopopt[1] = 0; /* length of HbH */
480 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
481 hopopt[3] = 2; /* Length of RA Option */
482 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
483 hopopt[5] = 0;
484 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
485 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
486
487 skb_put(skb, sizeof(*ip6h) + 8);
488
489 /* ICMPv6 */
490 skb_set_transport_header(skb, skb->len);
491 mldq = (struct mld_msg *) icmp6_hdr(skb);
492
493 interval = ipv6_addr_any(grp) ?
494 br->multicast_query_response_interval :
495 br->multicast_last_member_interval;
496
497 *igmp_type = ICMPV6_MGM_QUERY;
498 mldq->mld_type = ICMPV6_MGM_QUERY;
499 mldq->mld_code = 0;
500 mldq->mld_cksum = 0;
501 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
502 mldq->mld_reserved = 0;
503 mldq->mld_mca = *grp;
504
505 /* checksum */
506 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
507 sizeof(*mldq), IPPROTO_ICMPV6,
508 csum_partial(mldq,
509 sizeof(*mldq), 0));
510 skb_put(skb, sizeof(*mldq));
511
512 __skb_pull(skb, sizeof(*eth));
513
514 out:
515 return skb;
516 }
517 #endif
518
519 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
520 struct br_ip *addr,
521 u8 *igmp_type)
522 {
523 switch (addr->proto) {
524 case htons(ETH_P_IP):
525 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
526 #if IS_ENABLED(CONFIG_IPV6)
527 case htons(ETH_P_IPV6):
528 return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
529 igmp_type);
530 #endif
531 }
532 return NULL;
533 }
534
535 static struct net_bridge_mdb_entry *br_multicast_get_group(
536 struct net_bridge *br, struct net_bridge_port *port,
537 struct br_ip *group, int hash)
538 {
539 struct net_bridge_mdb_htable *mdb;
540 struct net_bridge_mdb_entry *mp;
541 unsigned int count = 0;
542 unsigned int max;
543 int elasticity;
544 int err;
545
546 mdb = rcu_dereference_protected(br->mdb, 1);
547 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
548 count++;
549 if (unlikely(br_ip_equal(group, &mp->addr)))
550 return mp;
551 }
552
553 elasticity = 0;
554 max = mdb->max;
555
556 if (unlikely(count > br->hash_elasticity && count)) {
557 if (net_ratelimit())
558 br_info(br, "Multicast hash table "
559 "chain limit reached: %s\n",
560 port ? port->dev->name : br->dev->name);
561
562 elasticity = br->hash_elasticity;
563 }
564
565 if (mdb->size >= max) {
566 max *= 2;
567 if (unlikely(max > br->hash_max)) {
568 br_warn(br, "Multicast hash table maximum of %d "
569 "reached, disabling snooping: %s\n",
570 br->hash_max,
571 port ? port->dev->name : br->dev->name);
572 err = -E2BIG;
573 disable:
574 br->multicast_disabled = 1;
575 goto err;
576 }
577 }
578
579 if (max > mdb->max || elasticity) {
580 if (mdb->old) {
581 if (net_ratelimit())
582 br_info(br, "Multicast hash table "
583 "on fire: %s\n",
584 port ? port->dev->name : br->dev->name);
585 err = -EEXIST;
586 goto err;
587 }
588
589 err = br_mdb_rehash(&br->mdb, max, elasticity);
590 if (err) {
591 br_warn(br, "Cannot rehash multicast "
592 "hash table, disabling snooping: %s, %d, %d\n",
593 port ? port->dev->name : br->dev->name,
594 mdb->size, err);
595 goto disable;
596 }
597
598 err = -EAGAIN;
599 goto err;
600 }
601
602 return NULL;
603
604 err:
605 mp = ERR_PTR(err);
606 return mp;
607 }
608
609 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
610 struct net_bridge_port *port, struct br_ip *group)
611 {
612 struct net_bridge_mdb_htable *mdb;
613 struct net_bridge_mdb_entry *mp;
614 int hash;
615 int err;
616
617 mdb = rcu_dereference_protected(br->mdb, 1);
618 if (!mdb) {
619 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
620 if (err)
621 return ERR_PTR(err);
622 goto rehash;
623 }
624
625 hash = br_ip_hash(mdb, group);
626 mp = br_multicast_get_group(br, port, group, hash);
627 switch (PTR_ERR(mp)) {
628 case 0:
629 break;
630
631 case -EAGAIN:
632 rehash:
633 mdb = rcu_dereference_protected(br->mdb, 1);
634 hash = br_ip_hash(mdb, group);
635 break;
636
637 default:
638 goto out;
639 }
640
641 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
642 if (unlikely(!mp))
643 return ERR_PTR(-ENOMEM);
644
645 mp->br = br;
646 mp->addr = *group;
647 setup_timer(&mp->timer, br_multicast_group_expired,
648 (unsigned long)mp);
649
650 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
651 mdb->size++;
652
653 out:
654 return mp;
655 }
656
657 struct net_bridge_port_group *br_multicast_new_port_group(
658 struct net_bridge_port *port,
659 struct br_ip *group,
660 struct net_bridge_port_group __rcu *next,
661 unsigned char flags)
662 {
663 struct net_bridge_port_group *p;
664
665 p = kzalloc(sizeof(*p), GFP_ATOMIC);
666 if (unlikely(!p))
667 return NULL;
668
669 p->addr = *group;
670 p->port = port;
671 p->flags = flags;
672 rcu_assign_pointer(p->next, next);
673 hlist_add_head(&p->mglist, &port->mglist);
674 setup_timer(&p->timer, br_multicast_port_group_expired,
675 (unsigned long)p);
676 return p;
677 }
678
679 static int br_multicast_add_group(struct net_bridge *br,
680 struct net_bridge_port *port,
681 struct br_ip *group)
682 {
683 struct net_bridge_mdb_entry *mp;
684 struct net_bridge_port_group *p;
685 struct net_bridge_port_group __rcu **pp;
686 unsigned long now = jiffies;
687 int err;
688
689 spin_lock(&br->multicast_lock);
690 if (!netif_running(br->dev) ||
691 (port && port->state == BR_STATE_DISABLED))
692 goto out;
693
694 mp = br_multicast_new_group(br, port, group);
695 err = PTR_ERR(mp);
696 if (IS_ERR(mp))
697 goto err;
698
699 if (!port) {
700 mp->mglist = true;
701 mod_timer(&mp->timer, now + br->multicast_membership_interval);
702 goto out;
703 }
704
705 for (pp = &mp->ports;
706 (p = mlock_dereference(*pp, br)) != NULL;
707 pp = &p->next) {
708 if (p->port == port)
709 goto found;
710 if ((unsigned long)p->port < (unsigned long)port)
711 break;
712 }
713
714 p = br_multicast_new_port_group(port, group, *pp, 0);
715 if (unlikely(!p))
716 goto err;
717 rcu_assign_pointer(*pp, p);
718 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
719
720 found:
721 mod_timer(&p->timer, now + br->multicast_membership_interval);
722 out:
723 err = 0;
724
725 err:
726 spin_unlock(&br->multicast_lock);
727 return err;
728 }
729
730 static int br_ip4_multicast_add_group(struct net_bridge *br,
731 struct net_bridge_port *port,
732 __be32 group,
733 __u16 vid)
734 {
735 struct br_ip br_group;
736
737 if (ipv4_is_local_multicast(group))
738 return 0;
739
740 br_group.u.ip4 = group;
741 br_group.proto = htons(ETH_P_IP);
742 br_group.vid = vid;
743
744 return br_multicast_add_group(br, port, &br_group);
745 }
746
747 #if IS_ENABLED(CONFIG_IPV6)
748 static int br_ip6_multicast_add_group(struct net_bridge *br,
749 struct net_bridge_port *port,
750 const struct in6_addr *group,
751 __u16 vid)
752 {
753 struct br_ip br_group;
754
755 if (ipv6_addr_is_ll_all_nodes(group))
756 return 0;
757
758 br_group.u.ip6 = *group;
759 br_group.proto = htons(ETH_P_IPV6);
760 br_group.vid = vid;
761
762 return br_multicast_add_group(br, port, &br_group);
763 }
764 #endif
765
766 static void br_multicast_router_expired(unsigned long data)
767 {
768 struct net_bridge_port *port = (void *)data;
769 struct net_bridge *br = port->br;
770
771 spin_lock(&br->multicast_lock);
772 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
773 port->multicast_router == MDB_RTR_TYPE_PERM ||
774 timer_pending(&port->multicast_router_timer) ||
775 hlist_unhashed(&port->rlist))
776 goto out;
777
778 hlist_del_init_rcu(&port->rlist);
779 br_rtr_notify(br->dev, port, RTM_DELMDB);
780 /* Don't allow timer refresh if the router expired */
781 if (port->multicast_router == MDB_RTR_TYPE_TEMP)
782 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
783
784 out:
785 spin_unlock(&br->multicast_lock);
786 }
787
788 static void br_multicast_local_router_expired(unsigned long data)
789 {
790 }
791
792 static void br_multicast_querier_expired(struct net_bridge *br,
793 struct bridge_mcast_own_query *query)
794 {
795 spin_lock(&br->multicast_lock);
796 if (!netif_running(br->dev) || br->multicast_disabled)
797 goto out;
798
799 br_multicast_start_querier(br, query);
800
801 out:
802 spin_unlock(&br->multicast_lock);
803 }
804
805 static void br_ip4_multicast_querier_expired(unsigned long data)
806 {
807 struct net_bridge *br = (void *)data;
808
809 br_multicast_querier_expired(br, &br->ip4_own_query);
810 }
811
812 #if IS_ENABLED(CONFIG_IPV6)
813 static void br_ip6_multicast_querier_expired(unsigned long data)
814 {
815 struct net_bridge *br = (void *)data;
816
817 br_multicast_querier_expired(br, &br->ip6_own_query);
818 }
819 #endif
820
821 static void br_multicast_select_own_querier(struct net_bridge *br,
822 struct br_ip *ip,
823 struct sk_buff *skb)
824 {
825 if (ip->proto == htons(ETH_P_IP))
826 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
827 #if IS_ENABLED(CONFIG_IPV6)
828 else
829 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
830 #endif
831 }
832
833 static void __br_multicast_send_query(struct net_bridge *br,
834 struct net_bridge_port *port,
835 struct br_ip *ip)
836 {
837 struct sk_buff *skb;
838 u8 igmp_type;
839
840 skb = br_multicast_alloc_query(br, ip, &igmp_type);
841 if (!skb)
842 return;
843
844 if (port) {
845 skb->dev = port->dev;
846 br_multicast_count(br, port, skb, igmp_type,
847 BR_MCAST_DIR_TX);
848 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
849 dev_net(port->dev), NULL, skb, NULL, skb->dev,
850 br_dev_queue_push_xmit);
851 } else {
852 br_multicast_select_own_querier(br, ip, skb);
853 br_multicast_count(br, port, skb, igmp_type,
854 BR_MCAST_DIR_RX);
855 netif_rx(skb);
856 }
857 }
858
859 static void br_multicast_send_query(struct net_bridge *br,
860 struct net_bridge_port *port,
861 struct bridge_mcast_own_query *own_query)
862 {
863 unsigned long time;
864 struct br_ip br_group;
865 struct bridge_mcast_other_query *other_query = NULL;
866
867 if (!netif_running(br->dev) || br->multicast_disabled ||
868 !br->multicast_querier)
869 return;
870
871 memset(&br_group.u, 0, sizeof(br_group.u));
872
873 if (port ? (own_query == &port->ip4_own_query) :
874 (own_query == &br->ip4_own_query)) {
875 other_query = &br->ip4_other_query;
876 br_group.proto = htons(ETH_P_IP);
877 #if IS_ENABLED(CONFIG_IPV6)
878 } else {
879 other_query = &br->ip6_other_query;
880 br_group.proto = htons(ETH_P_IPV6);
881 #endif
882 }
883
884 if (!other_query || timer_pending(&other_query->timer))
885 return;
886
887 __br_multicast_send_query(br, port, &br_group);
888
889 time = jiffies;
890 time += own_query->startup_sent < br->multicast_startup_query_count ?
891 br->multicast_startup_query_interval :
892 br->multicast_query_interval;
893 mod_timer(&own_query->timer, time);
894 }
895
896 static void
897 br_multicast_port_query_expired(struct net_bridge_port *port,
898 struct bridge_mcast_own_query *query)
899 {
900 struct net_bridge *br = port->br;
901
902 spin_lock(&br->multicast_lock);
903 if (port->state == BR_STATE_DISABLED ||
904 port->state == BR_STATE_BLOCKING)
905 goto out;
906
907 if (query->startup_sent < br->multicast_startup_query_count)
908 query->startup_sent++;
909
910 br_multicast_send_query(port->br, port, query);
911
912 out:
913 spin_unlock(&br->multicast_lock);
914 }
915
916 static void br_ip4_multicast_port_query_expired(unsigned long data)
917 {
918 struct net_bridge_port *port = (void *)data;
919
920 br_multicast_port_query_expired(port, &port->ip4_own_query);
921 }
922
923 #if IS_ENABLED(CONFIG_IPV6)
924 static void br_ip6_multicast_port_query_expired(unsigned long data)
925 {
926 struct net_bridge_port *port = (void *)data;
927
928 br_multicast_port_query_expired(port, &port->ip6_own_query);
929 }
930 #endif
931
932 int br_multicast_add_port(struct net_bridge_port *port)
933 {
934 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
935
936 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
937 (unsigned long)port);
938 setup_timer(&port->ip4_own_query.timer,
939 br_ip4_multicast_port_query_expired, (unsigned long)port);
940 #if IS_ENABLED(CONFIG_IPV6)
941 setup_timer(&port->ip6_own_query.timer,
942 br_ip6_multicast_port_query_expired, (unsigned long)port);
943 #endif
944 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
945 if (!port->mcast_stats)
946 return -ENOMEM;
947
948 return 0;
949 }
950
951 void br_multicast_del_port(struct net_bridge_port *port)
952 {
953 struct net_bridge *br = port->br;
954 struct net_bridge_port_group *pg;
955 struct hlist_node *n;
956
957 /* Take care of the remaining groups, only perm ones should be left */
958 spin_lock_bh(&br->multicast_lock);
959 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
960 br_multicast_del_pg(br, pg);
961 spin_unlock_bh(&br->multicast_lock);
962 del_timer_sync(&port->multicast_router_timer);
963 free_percpu(port->mcast_stats);
964 }
965
966 static void br_multicast_enable(struct bridge_mcast_own_query *query)
967 {
968 query->startup_sent = 0;
969
970 if (try_to_del_timer_sync(&query->timer) >= 0 ||
971 del_timer(&query->timer))
972 mod_timer(&query->timer, jiffies);
973 }
974
975 static void __br_multicast_enable_port(struct net_bridge_port *port)
976 {
977 struct net_bridge *br = port->br;
978
979 if (br->multicast_disabled || !netif_running(br->dev))
980 return;
981
982 br_multicast_enable(&port->ip4_own_query);
983 #if IS_ENABLED(CONFIG_IPV6)
984 br_multicast_enable(&port->ip6_own_query);
985 #endif
986 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
987 hlist_unhashed(&port->rlist))
988 br_multicast_add_router(br, port);
989 }
990
991 void br_multicast_enable_port(struct net_bridge_port *port)
992 {
993 struct net_bridge *br = port->br;
994
995 spin_lock(&br->multicast_lock);
996 __br_multicast_enable_port(port);
997 spin_unlock(&br->multicast_lock);
998 }
999
1000 void br_multicast_disable_port(struct net_bridge_port *port)
1001 {
1002 struct net_bridge *br = port->br;
1003 struct net_bridge_port_group *pg;
1004 struct hlist_node *n;
1005
1006 spin_lock(&br->multicast_lock);
1007 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1008 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
1009 br_multicast_del_pg(br, pg);
1010
1011 if (!hlist_unhashed(&port->rlist)) {
1012 hlist_del_init_rcu(&port->rlist);
1013 br_rtr_notify(br->dev, port, RTM_DELMDB);
1014 /* Don't allow timer refresh if disabling */
1015 if (port->multicast_router == MDB_RTR_TYPE_TEMP)
1016 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1017 }
1018 del_timer(&port->multicast_router_timer);
1019 del_timer(&port->ip4_own_query.timer);
1020 #if IS_ENABLED(CONFIG_IPV6)
1021 del_timer(&port->ip6_own_query.timer);
1022 #endif
1023 spin_unlock(&br->multicast_lock);
1024 }
1025
1026 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1027 struct net_bridge_port *port,
1028 struct sk_buff *skb,
1029 u16 vid)
1030 {
1031 struct igmpv3_report *ih;
1032 struct igmpv3_grec *grec;
1033 int i;
1034 int len;
1035 int num;
1036 int type;
1037 int err = 0;
1038 __be32 group;
1039
1040 ih = igmpv3_report_hdr(skb);
1041 num = ntohs(ih->ngrec);
1042 len = skb_transport_offset(skb) + sizeof(*ih);
1043
1044 for (i = 0; i < num; i++) {
1045 len += sizeof(*grec);
1046 if (!pskb_may_pull(skb, len))
1047 return -EINVAL;
1048
1049 grec = (void *)(skb->data + len - sizeof(*grec));
1050 group = grec->grec_mca;
1051 type = grec->grec_type;
1052
1053 len += ntohs(grec->grec_nsrcs) * 4;
1054 if (!pskb_may_pull(skb, len))
1055 return -EINVAL;
1056
1057 /* We treat this as an IGMPv2 report for now. */
1058 switch (type) {
1059 case IGMPV3_MODE_IS_INCLUDE:
1060 case IGMPV3_MODE_IS_EXCLUDE:
1061 case IGMPV3_CHANGE_TO_INCLUDE:
1062 case IGMPV3_CHANGE_TO_EXCLUDE:
1063 case IGMPV3_ALLOW_NEW_SOURCES:
1064 case IGMPV3_BLOCK_OLD_SOURCES:
1065 break;
1066
1067 default:
1068 continue;
1069 }
1070
1071 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1072 type == IGMPV3_MODE_IS_INCLUDE) &&
1073 ntohs(grec->grec_nsrcs) == 0) {
1074 br_ip4_multicast_leave_group(br, port, group, vid);
1075 } else {
1076 err = br_ip4_multicast_add_group(br, port, group, vid);
1077 if (err)
1078 break;
1079 }
1080 }
1081
1082 return err;
1083 }
1084
1085 #if IS_ENABLED(CONFIG_IPV6)
1086 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1087 struct net_bridge_port *port,
1088 struct sk_buff *skb,
1089 u16 vid)
1090 {
1091 struct icmp6hdr *icmp6h;
1092 struct mld2_grec *grec;
1093 int i;
1094 int len;
1095 int num;
1096 int err = 0;
1097
1098 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1099 return -EINVAL;
1100
1101 icmp6h = icmp6_hdr(skb);
1102 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1103 len = skb_transport_offset(skb) + sizeof(*icmp6h);
1104
1105 for (i = 0; i < num; i++) {
1106 __be16 *nsrcs, _nsrcs;
1107
1108 nsrcs = skb_header_pointer(skb,
1109 len + offsetof(struct mld2_grec,
1110 grec_nsrcs),
1111 sizeof(_nsrcs), &_nsrcs);
1112 if (!nsrcs)
1113 return -EINVAL;
1114
1115 if (!pskb_may_pull(skb,
1116 len + sizeof(*grec) +
1117 sizeof(struct in6_addr) * ntohs(*nsrcs)))
1118 return -EINVAL;
1119
1120 grec = (struct mld2_grec *)(skb->data + len);
1121 len += sizeof(*grec) +
1122 sizeof(struct in6_addr) * ntohs(*nsrcs);
1123
1124 /* We treat these as MLDv1 reports for now. */
1125 switch (grec->grec_type) {
1126 case MLD2_MODE_IS_INCLUDE:
1127 case MLD2_MODE_IS_EXCLUDE:
1128 case MLD2_CHANGE_TO_INCLUDE:
1129 case MLD2_CHANGE_TO_EXCLUDE:
1130 case MLD2_ALLOW_NEW_SOURCES:
1131 case MLD2_BLOCK_OLD_SOURCES:
1132 break;
1133
1134 default:
1135 continue;
1136 }
1137
1138 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1139 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1140 ntohs(*nsrcs) == 0) {
1141 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1142 vid);
1143 } else {
1144 err = br_ip6_multicast_add_group(br, port,
1145 &grec->grec_mca, vid);
1146 if (err)
1147 break;
1148 }
1149 }
1150
1151 return err;
1152 }
1153 #endif
1154
1155 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1156 struct net_bridge_port *port,
1157 __be32 saddr)
1158 {
1159 if (!timer_pending(&br->ip4_own_query.timer) &&
1160 !timer_pending(&br->ip4_other_query.timer))
1161 goto update;
1162
1163 if (!br->ip4_querier.addr.u.ip4)
1164 goto update;
1165
1166 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1167 goto update;
1168
1169 return false;
1170
1171 update:
1172 br->ip4_querier.addr.u.ip4 = saddr;
1173
1174 /* update protected by general multicast_lock by caller */
1175 rcu_assign_pointer(br->ip4_querier.port, port);
1176
1177 return true;
1178 }
1179
1180 #if IS_ENABLED(CONFIG_IPV6)
1181 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1182 struct net_bridge_port *port,
1183 struct in6_addr *saddr)
1184 {
1185 if (!timer_pending(&br->ip6_own_query.timer) &&
1186 !timer_pending(&br->ip6_other_query.timer))
1187 goto update;
1188
1189 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1190 goto update;
1191
1192 return false;
1193
1194 update:
1195 br->ip6_querier.addr.u.ip6 = *saddr;
1196
1197 /* update protected by general multicast_lock by caller */
1198 rcu_assign_pointer(br->ip6_querier.port, port);
1199
1200 return true;
1201 }
1202 #endif
1203
1204 static bool br_multicast_select_querier(struct net_bridge *br,
1205 struct net_bridge_port *port,
1206 struct br_ip *saddr)
1207 {
1208 switch (saddr->proto) {
1209 case htons(ETH_P_IP):
1210 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1211 #if IS_ENABLED(CONFIG_IPV6)
1212 case htons(ETH_P_IPV6):
1213 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1214 #endif
1215 }
1216
1217 return false;
1218 }
1219
1220 static void
1221 br_multicast_update_query_timer(struct net_bridge *br,
1222 struct bridge_mcast_other_query *query,
1223 unsigned long max_delay)
1224 {
1225 if (!timer_pending(&query->timer))
1226 query->delay_time = jiffies + max_delay;
1227
1228 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1229 }
1230
1231 /*
1232 * Add port to router_list
1233 * list is maintained ordered by pointer value
1234 * and locked by br->multicast_lock and RCU
1235 */
1236 static void br_multicast_add_router(struct net_bridge *br,
1237 struct net_bridge_port *port)
1238 {
1239 struct net_bridge_port *p;
1240 struct hlist_node *slot = NULL;
1241
1242 if (!hlist_unhashed(&port->rlist))
1243 return;
1244
1245 hlist_for_each_entry(p, &br->router_list, rlist) {
1246 if ((unsigned long) port >= (unsigned long) p)
1247 break;
1248 slot = &p->rlist;
1249 }
1250
1251 if (slot)
1252 hlist_add_behind_rcu(&port->rlist, slot);
1253 else
1254 hlist_add_head_rcu(&port->rlist, &br->router_list);
1255 br_rtr_notify(br->dev, port, RTM_NEWMDB);
1256 }
1257
1258 static void br_multicast_mark_router(struct net_bridge *br,
1259 struct net_bridge_port *port)
1260 {
1261 unsigned long now = jiffies;
1262
1263 if (!port) {
1264 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY)
1265 mod_timer(&br->multicast_router_timer,
1266 now + br->multicast_querier_interval);
1267 return;
1268 }
1269
1270 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1271 port->multicast_router == MDB_RTR_TYPE_PERM)
1272 return;
1273
1274 br_multicast_add_router(br, port);
1275
1276 mod_timer(&port->multicast_router_timer,
1277 now + br->multicast_querier_interval);
1278 }
1279
1280 static void br_multicast_query_received(struct net_bridge *br,
1281 struct net_bridge_port *port,
1282 struct bridge_mcast_other_query *query,
1283 struct br_ip *saddr,
1284 unsigned long max_delay)
1285 {
1286 if (!br_multicast_select_querier(br, port, saddr))
1287 return;
1288
1289 br_multicast_update_query_timer(br, query, max_delay);
1290 br_multicast_mark_router(br, port);
1291 }
1292
1293 static int br_ip4_multicast_query(struct net_bridge *br,
1294 struct net_bridge_port *port,
1295 struct sk_buff *skb,
1296 u16 vid)
1297 {
1298 const struct iphdr *iph = ip_hdr(skb);
1299 struct igmphdr *ih = igmp_hdr(skb);
1300 struct net_bridge_mdb_entry *mp;
1301 struct igmpv3_query *ih3;
1302 struct net_bridge_port_group *p;
1303 struct net_bridge_port_group __rcu **pp;
1304 struct br_ip saddr;
1305 unsigned long max_delay;
1306 unsigned long now = jiffies;
1307 unsigned int offset = skb_transport_offset(skb);
1308 __be32 group;
1309 int err = 0;
1310
1311 spin_lock(&br->multicast_lock);
1312 if (!netif_running(br->dev) ||
1313 (port && port->state == BR_STATE_DISABLED))
1314 goto out;
1315
1316 group = ih->group;
1317
1318 if (skb->len == offset + sizeof(*ih)) {
1319 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1320
1321 if (!max_delay) {
1322 max_delay = 10 * HZ;
1323 group = 0;
1324 }
1325 } else if (skb->len >= offset + sizeof(*ih3)) {
1326 ih3 = igmpv3_query_hdr(skb);
1327 if (ih3->nsrcs)
1328 goto out;
1329
1330 max_delay = ih3->code ?
1331 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1332 } else {
1333 goto out;
1334 }
1335
1336 if (!group) {
1337 saddr.proto = htons(ETH_P_IP);
1338 saddr.u.ip4 = iph->saddr;
1339
1340 br_multicast_query_received(br, port, &br->ip4_other_query,
1341 &saddr, max_delay);
1342 goto out;
1343 }
1344
1345 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1346 if (!mp)
1347 goto out;
1348
1349 max_delay *= br->multicast_last_member_count;
1350
1351 if (mp->mglist &&
1352 (timer_pending(&mp->timer) ?
1353 time_after(mp->timer.expires, now + max_delay) :
1354 try_to_del_timer_sync(&mp->timer) >= 0))
1355 mod_timer(&mp->timer, now + max_delay);
1356
1357 for (pp = &mp->ports;
1358 (p = mlock_dereference(*pp, br)) != NULL;
1359 pp = &p->next) {
1360 if (timer_pending(&p->timer) ?
1361 time_after(p->timer.expires, now + max_delay) :
1362 try_to_del_timer_sync(&p->timer) >= 0)
1363 mod_timer(&p->timer, now + max_delay);
1364 }
1365
1366 out:
1367 spin_unlock(&br->multicast_lock);
1368 return err;
1369 }
1370
1371 #if IS_ENABLED(CONFIG_IPV6)
1372 static int br_ip6_multicast_query(struct net_bridge *br,
1373 struct net_bridge_port *port,
1374 struct sk_buff *skb,
1375 u16 vid)
1376 {
1377 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1378 struct mld_msg *mld;
1379 struct net_bridge_mdb_entry *mp;
1380 struct mld2_query *mld2q;
1381 struct net_bridge_port_group *p;
1382 struct net_bridge_port_group __rcu **pp;
1383 struct br_ip saddr;
1384 unsigned long max_delay;
1385 unsigned long now = jiffies;
1386 unsigned int offset = skb_transport_offset(skb);
1387 const struct in6_addr *group = NULL;
1388 bool is_general_query;
1389 int err = 0;
1390
1391 spin_lock(&br->multicast_lock);
1392 if (!netif_running(br->dev) ||
1393 (port && port->state == BR_STATE_DISABLED))
1394 goto out;
1395
1396 if (skb->len == offset + sizeof(*mld)) {
1397 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1398 err = -EINVAL;
1399 goto out;
1400 }
1401 mld = (struct mld_msg *) icmp6_hdr(skb);
1402 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1403 if (max_delay)
1404 group = &mld->mld_mca;
1405 } else {
1406 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1407 err = -EINVAL;
1408 goto out;
1409 }
1410 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1411 if (!mld2q->mld2q_nsrcs)
1412 group = &mld2q->mld2q_mca;
1413
1414 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1415 }
1416
1417 is_general_query = group && ipv6_addr_any(group);
1418
1419 if (is_general_query) {
1420 saddr.proto = htons(ETH_P_IPV6);
1421 saddr.u.ip6 = ip6h->saddr;
1422
1423 br_multicast_query_received(br, port, &br->ip6_other_query,
1424 &saddr, max_delay);
1425 goto out;
1426 } else if (!group) {
1427 goto out;
1428 }
1429
1430 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1431 if (!mp)
1432 goto out;
1433
1434 max_delay *= br->multicast_last_member_count;
1435 if (mp->mglist &&
1436 (timer_pending(&mp->timer) ?
1437 time_after(mp->timer.expires, now + max_delay) :
1438 try_to_del_timer_sync(&mp->timer) >= 0))
1439 mod_timer(&mp->timer, now + max_delay);
1440
1441 for (pp = &mp->ports;
1442 (p = mlock_dereference(*pp, br)) != NULL;
1443 pp = &p->next) {
1444 if (timer_pending(&p->timer) ?
1445 time_after(p->timer.expires, now + max_delay) :
1446 try_to_del_timer_sync(&p->timer) >= 0)
1447 mod_timer(&p->timer, now + max_delay);
1448 }
1449
1450 out:
1451 spin_unlock(&br->multicast_lock);
1452 return err;
1453 }
1454 #endif
1455
1456 static void
1457 br_multicast_leave_group(struct net_bridge *br,
1458 struct net_bridge_port *port,
1459 struct br_ip *group,
1460 struct bridge_mcast_other_query *other_query,
1461 struct bridge_mcast_own_query *own_query)
1462 {
1463 struct net_bridge_mdb_htable *mdb;
1464 struct net_bridge_mdb_entry *mp;
1465 struct net_bridge_port_group *p;
1466 unsigned long now;
1467 unsigned long time;
1468
1469 spin_lock(&br->multicast_lock);
1470 if (!netif_running(br->dev) ||
1471 (port && port->state == BR_STATE_DISABLED))
1472 goto out;
1473
1474 mdb = mlock_dereference(br->mdb, br);
1475 mp = br_mdb_ip_get(mdb, group);
1476 if (!mp)
1477 goto out;
1478
1479 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1480 struct net_bridge_port_group __rcu **pp;
1481
1482 for (pp = &mp->ports;
1483 (p = mlock_dereference(*pp, br)) != NULL;
1484 pp = &p->next) {
1485 if (p->port != port)
1486 continue;
1487
1488 rcu_assign_pointer(*pp, p->next);
1489 hlist_del_init(&p->mglist);
1490 del_timer(&p->timer);
1491 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1492 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1493 p->flags);
1494
1495 if (!mp->ports && !mp->mglist &&
1496 netif_running(br->dev))
1497 mod_timer(&mp->timer, jiffies);
1498 }
1499 goto out;
1500 }
1501
1502 if (timer_pending(&other_query->timer))
1503 goto out;
1504
1505 if (br->multicast_querier) {
1506 __br_multicast_send_query(br, port, &mp->addr);
1507
1508 time = jiffies + br->multicast_last_member_count *
1509 br->multicast_last_member_interval;
1510
1511 mod_timer(&own_query->timer, time);
1512
1513 for (p = mlock_dereference(mp->ports, br);
1514 p != NULL;
1515 p = mlock_dereference(p->next, br)) {
1516 if (p->port != port)
1517 continue;
1518
1519 if (!hlist_unhashed(&p->mglist) &&
1520 (timer_pending(&p->timer) ?
1521 time_after(p->timer.expires, time) :
1522 try_to_del_timer_sync(&p->timer) >= 0)) {
1523 mod_timer(&p->timer, time);
1524 }
1525
1526 break;
1527 }
1528 }
1529
1530 now = jiffies;
1531 time = now + br->multicast_last_member_count *
1532 br->multicast_last_member_interval;
1533
1534 if (!port) {
1535 if (mp->mglist &&
1536 (timer_pending(&mp->timer) ?
1537 time_after(mp->timer.expires, time) :
1538 try_to_del_timer_sync(&mp->timer) >= 0)) {
1539 mod_timer(&mp->timer, time);
1540 }
1541
1542 goto out;
1543 }
1544
1545 for (p = mlock_dereference(mp->ports, br);
1546 p != NULL;
1547 p = mlock_dereference(p->next, br)) {
1548 if (p->port != port)
1549 continue;
1550
1551 if (!hlist_unhashed(&p->mglist) &&
1552 (timer_pending(&p->timer) ?
1553 time_after(p->timer.expires, time) :
1554 try_to_del_timer_sync(&p->timer) >= 0)) {
1555 mod_timer(&p->timer, time);
1556 }
1557
1558 break;
1559 }
1560 out:
1561 spin_unlock(&br->multicast_lock);
1562 }
1563
1564 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1565 struct net_bridge_port *port,
1566 __be32 group,
1567 __u16 vid)
1568 {
1569 struct br_ip br_group;
1570 struct bridge_mcast_own_query *own_query;
1571
1572 if (ipv4_is_local_multicast(group))
1573 return;
1574
1575 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1576
1577 br_group.u.ip4 = group;
1578 br_group.proto = htons(ETH_P_IP);
1579 br_group.vid = vid;
1580
1581 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1582 own_query);
1583 }
1584
1585 #if IS_ENABLED(CONFIG_IPV6)
1586 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1587 struct net_bridge_port *port,
1588 const struct in6_addr *group,
1589 __u16 vid)
1590 {
1591 struct br_ip br_group;
1592 struct bridge_mcast_own_query *own_query;
1593
1594 if (ipv6_addr_is_ll_all_nodes(group))
1595 return;
1596
1597 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1598
1599 br_group.u.ip6 = *group;
1600 br_group.proto = htons(ETH_P_IPV6);
1601 br_group.vid = vid;
1602
1603 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1604 own_query);
1605 }
1606 #endif
1607
1608 static void br_multicast_err_count(const struct net_bridge *br,
1609 const struct net_bridge_port *p,
1610 __be16 proto)
1611 {
1612 struct bridge_mcast_stats __percpu *stats;
1613 struct bridge_mcast_stats *pstats;
1614
1615 if (!br->multicast_stats_enabled)
1616 return;
1617
1618 if (p)
1619 stats = p->mcast_stats;
1620 else
1621 stats = br->mcast_stats;
1622 if (WARN_ON(!stats))
1623 return;
1624
1625 pstats = this_cpu_ptr(stats);
1626
1627 u64_stats_update_begin(&pstats->syncp);
1628 switch (proto) {
1629 case htons(ETH_P_IP):
1630 pstats->mstats.igmp_parse_errors++;
1631 break;
1632 #if IS_ENABLED(CONFIG_IPV6)
1633 case htons(ETH_P_IPV6):
1634 pstats->mstats.mld_parse_errors++;
1635 break;
1636 #endif
1637 }
1638 u64_stats_update_end(&pstats->syncp);
1639 }
1640
1641 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1642 struct net_bridge_port *port,
1643 struct sk_buff *skb,
1644 u16 vid)
1645 {
1646 struct sk_buff *skb_trimmed = NULL;
1647 struct igmphdr *ih;
1648 int err;
1649
1650 err = ip_mc_check_igmp(skb, &skb_trimmed);
1651
1652 if (err == -ENOMSG) {
1653 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
1654 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1655 return 0;
1656 } else if (err < 0) {
1657 br_multicast_err_count(br, port, skb->protocol);
1658 return err;
1659 }
1660
1661 ih = igmp_hdr(skb);
1662 BR_INPUT_SKB_CB(skb)->igmp = ih->type;
1663
1664 switch (ih->type) {
1665 case IGMP_HOST_MEMBERSHIP_REPORT:
1666 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1667 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1668 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1669 break;
1670 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1671 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1672 break;
1673 case IGMP_HOST_MEMBERSHIP_QUERY:
1674 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1675 break;
1676 case IGMP_HOST_LEAVE_MESSAGE:
1677 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1678 break;
1679 }
1680
1681 if (skb_trimmed && skb_trimmed != skb)
1682 kfree_skb(skb_trimmed);
1683
1684 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1685 BR_MCAST_DIR_RX);
1686
1687 return err;
1688 }
1689
1690 #if IS_ENABLED(CONFIG_IPV6)
1691 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1692 struct net_bridge_port *port,
1693 struct sk_buff *skb,
1694 u16 vid)
1695 {
1696 struct sk_buff *skb_trimmed = NULL;
1697 struct mld_msg *mld;
1698 int err;
1699
1700 err = ipv6_mc_check_mld(skb, &skb_trimmed);
1701
1702 if (err == -ENOMSG) {
1703 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1704 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1705 return 0;
1706 } else if (err < 0) {
1707 br_multicast_err_count(br, port, skb->protocol);
1708 return err;
1709 }
1710
1711 mld = (struct mld_msg *)skb_transport_header(skb);
1712 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
1713
1714 switch (mld->mld_type) {
1715 case ICMPV6_MGM_REPORT:
1716 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1717 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1718 break;
1719 case ICMPV6_MLD2_REPORT:
1720 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1721 break;
1722 case ICMPV6_MGM_QUERY:
1723 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1724 break;
1725 case ICMPV6_MGM_REDUCTION:
1726 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1727 break;
1728 }
1729
1730 if (skb_trimmed && skb_trimmed != skb)
1731 kfree_skb(skb_trimmed);
1732
1733 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1734 BR_MCAST_DIR_RX);
1735
1736 return err;
1737 }
1738 #endif
1739
1740 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1741 struct sk_buff *skb, u16 vid)
1742 {
1743 int ret = 0;
1744
1745 BR_INPUT_SKB_CB(skb)->igmp = 0;
1746 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1747
1748 if (br->multicast_disabled)
1749 return 0;
1750
1751 switch (skb->protocol) {
1752 case htons(ETH_P_IP):
1753 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1754 break;
1755 #if IS_ENABLED(CONFIG_IPV6)
1756 case htons(ETH_P_IPV6):
1757 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1758 break;
1759 #endif
1760 }
1761
1762 return ret;
1763 }
1764
1765 static void br_multicast_query_expired(struct net_bridge *br,
1766 struct bridge_mcast_own_query *query,
1767 struct bridge_mcast_querier *querier)
1768 {
1769 spin_lock(&br->multicast_lock);
1770 if (query->startup_sent < br->multicast_startup_query_count)
1771 query->startup_sent++;
1772
1773 RCU_INIT_POINTER(querier->port, NULL);
1774 br_multicast_send_query(br, NULL, query);
1775 spin_unlock(&br->multicast_lock);
1776 }
1777
1778 static void br_ip4_multicast_query_expired(unsigned long data)
1779 {
1780 struct net_bridge *br = (void *)data;
1781
1782 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1783 }
1784
1785 #if IS_ENABLED(CONFIG_IPV6)
1786 static void br_ip6_multicast_query_expired(unsigned long data)
1787 {
1788 struct net_bridge *br = (void *)data;
1789
1790 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1791 }
1792 #endif
1793
1794 void br_multicast_init(struct net_bridge *br)
1795 {
1796 br->hash_elasticity = 4;
1797 br->hash_max = 512;
1798
1799 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1800 br->multicast_querier = 0;
1801 br->multicast_query_use_ifaddr = 0;
1802 br->multicast_last_member_count = 2;
1803 br->multicast_startup_query_count = 2;
1804
1805 br->multicast_last_member_interval = HZ;
1806 br->multicast_query_response_interval = 10 * HZ;
1807 br->multicast_startup_query_interval = 125 * HZ / 4;
1808 br->multicast_query_interval = 125 * HZ;
1809 br->multicast_querier_interval = 255 * HZ;
1810 br->multicast_membership_interval = 260 * HZ;
1811
1812 br->ip4_other_query.delay_time = 0;
1813 br->ip4_querier.port = NULL;
1814 #if IS_ENABLED(CONFIG_IPV6)
1815 br->ip6_other_query.delay_time = 0;
1816 br->ip6_querier.port = NULL;
1817 #endif
1818 br->has_ipv6_addr = 1;
1819
1820 spin_lock_init(&br->multicast_lock);
1821 setup_timer(&br->multicast_router_timer,
1822 br_multicast_local_router_expired, 0);
1823 setup_timer(&br->ip4_other_query.timer,
1824 br_ip4_multicast_querier_expired, (unsigned long)br);
1825 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1826 (unsigned long)br);
1827 #if IS_ENABLED(CONFIG_IPV6)
1828 setup_timer(&br->ip6_other_query.timer,
1829 br_ip6_multicast_querier_expired, (unsigned long)br);
1830 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1831 (unsigned long)br);
1832 #endif
1833 }
1834
1835 static void __br_multicast_open(struct net_bridge *br,
1836 struct bridge_mcast_own_query *query)
1837 {
1838 query->startup_sent = 0;
1839
1840 if (br->multicast_disabled)
1841 return;
1842
1843 mod_timer(&query->timer, jiffies);
1844 }
1845
1846 void br_multicast_open(struct net_bridge *br)
1847 {
1848 __br_multicast_open(br, &br->ip4_own_query);
1849 #if IS_ENABLED(CONFIG_IPV6)
1850 __br_multicast_open(br, &br->ip6_own_query);
1851 #endif
1852 }
1853
1854 void br_multicast_stop(struct net_bridge *br)
1855 {
1856 del_timer_sync(&br->multicast_router_timer);
1857 del_timer_sync(&br->ip4_other_query.timer);
1858 del_timer_sync(&br->ip4_own_query.timer);
1859 #if IS_ENABLED(CONFIG_IPV6)
1860 del_timer_sync(&br->ip6_other_query.timer);
1861 del_timer_sync(&br->ip6_own_query.timer);
1862 #endif
1863 }
1864
1865 void br_multicast_dev_del(struct net_bridge *br)
1866 {
1867 struct net_bridge_mdb_htable *mdb;
1868 struct net_bridge_mdb_entry *mp;
1869 struct hlist_node *n;
1870 u32 ver;
1871 int i;
1872
1873 spin_lock_bh(&br->multicast_lock);
1874 mdb = mlock_dereference(br->mdb, br);
1875 if (!mdb)
1876 goto out;
1877
1878 br->mdb = NULL;
1879
1880 ver = mdb->ver;
1881 for (i = 0; i < mdb->max; i++) {
1882 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1883 hlist[ver]) {
1884 del_timer(&mp->timer);
1885 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1886 }
1887 }
1888
1889 if (mdb->old) {
1890 spin_unlock_bh(&br->multicast_lock);
1891 rcu_barrier_bh();
1892 spin_lock_bh(&br->multicast_lock);
1893 WARN_ON(mdb->old);
1894 }
1895
1896 mdb->old = mdb;
1897 call_rcu_bh(&mdb->rcu, br_mdb_free);
1898
1899 out:
1900 spin_unlock_bh(&br->multicast_lock);
1901
1902 free_percpu(br->mcast_stats);
1903 }
1904
1905 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1906 {
1907 int err = -EINVAL;
1908
1909 spin_lock_bh(&br->multicast_lock);
1910
1911 switch (val) {
1912 case MDB_RTR_TYPE_DISABLED:
1913 case MDB_RTR_TYPE_PERM:
1914 del_timer(&br->multicast_router_timer);
1915 /* fall through */
1916 case MDB_RTR_TYPE_TEMP_QUERY:
1917 br->multicast_router = val;
1918 err = 0;
1919 break;
1920 }
1921
1922 spin_unlock_bh(&br->multicast_lock);
1923
1924 return err;
1925 }
1926
1927 static void __del_port_router(struct net_bridge_port *p)
1928 {
1929 if (hlist_unhashed(&p->rlist))
1930 return;
1931 hlist_del_init_rcu(&p->rlist);
1932 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
1933 }
1934
1935 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1936 {
1937 struct net_bridge *br = p->br;
1938 unsigned long now = jiffies;
1939 int err = -EINVAL;
1940
1941 spin_lock(&br->multicast_lock);
1942 if (p->multicast_router == val) {
1943 /* Refresh the temp router port timer */
1944 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1945 mod_timer(&p->multicast_router_timer,
1946 now + br->multicast_querier_interval);
1947 err = 0;
1948 goto unlock;
1949 }
1950 switch (val) {
1951 case MDB_RTR_TYPE_DISABLED:
1952 p->multicast_router = MDB_RTR_TYPE_DISABLED;
1953 __del_port_router(p);
1954 del_timer(&p->multicast_router_timer);
1955 break;
1956 case MDB_RTR_TYPE_TEMP_QUERY:
1957 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1958 __del_port_router(p);
1959 break;
1960 case MDB_RTR_TYPE_PERM:
1961 p->multicast_router = MDB_RTR_TYPE_PERM;
1962 del_timer(&p->multicast_router_timer);
1963 br_multicast_add_router(br, p);
1964 break;
1965 case MDB_RTR_TYPE_TEMP:
1966 p->multicast_router = MDB_RTR_TYPE_TEMP;
1967 br_multicast_mark_router(br, p);
1968 break;
1969 default:
1970 goto unlock;
1971 }
1972 err = 0;
1973 unlock:
1974 spin_unlock(&br->multicast_lock);
1975
1976 return err;
1977 }
1978
1979 static void br_multicast_start_querier(struct net_bridge *br,
1980 struct bridge_mcast_own_query *query)
1981 {
1982 struct net_bridge_port *port;
1983
1984 __br_multicast_open(br, query);
1985
1986 list_for_each_entry(port, &br->port_list, list) {
1987 if (port->state == BR_STATE_DISABLED ||
1988 port->state == BR_STATE_BLOCKING)
1989 continue;
1990
1991 if (query == &br->ip4_own_query)
1992 br_multicast_enable(&port->ip4_own_query);
1993 #if IS_ENABLED(CONFIG_IPV6)
1994 else
1995 br_multicast_enable(&port->ip6_own_query);
1996 #endif
1997 }
1998 }
1999
2000 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2001 {
2002 struct net_bridge_mdb_htable *mdb;
2003 struct net_bridge_port *port;
2004 int err = 0;
2005
2006 spin_lock_bh(&br->multicast_lock);
2007 if (br->multicast_disabled == !val)
2008 goto unlock;
2009
2010 br->multicast_disabled = !val;
2011 if (br->multicast_disabled)
2012 goto unlock;
2013
2014 if (!netif_running(br->dev))
2015 goto unlock;
2016
2017 mdb = mlock_dereference(br->mdb, br);
2018 if (mdb) {
2019 if (mdb->old) {
2020 err = -EEXIST;
2021 rollback:
2022 br->multicast_disabled = !!val;
2023 goto unlock;
2024 }
2025
2026 err = br_mdb_rehash(&br->mdb, mdb->max,
2027 br->hash_elasticity);
2028 if (err)
2029 goto rollback;
2030 }
2031
2032 br_multicast_open(br);
2033 list_for_each_entry(port, &br->port_list, list)
2034 __br_multicast_enable_port(port);
2035
2036 unlock:
2037 spin_unlock_bh(&br->multicast_lock);
2038
2039 return err;
2040 }
2041
2042 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2043 {
2044 unsigned long max_delay;
2045
2046 val = !!val;
2047
2048 spin_lock_bh(&br->multicast_lock);
2049 if (br->multicast_querier == val)
2050 goto unlock;
2051
2052 br->multicast_querier = val;
2053 if (!val)
2054 goto unlock;
2055
2056 max_delay = br->multicast_query_response_interval;
2057
2058 if (!timer_pending(&br->ip4_other_query.timer))
2059 br->ip4_other_query.delay_time = jiffies + max_delay;
2060
2061 br_multicast_start_querier(br, &br->ip4_own_query);
2062
2063 #if IS_ENABLED(CONFIG_IPV6)
2064 if (!timer_pending(&br->ip6_other_query.timer))
2065 br->ip6_other_query.delay_time = jiffies + max_delay;
2066
2067 br_multicast_start_querier(br, &br->ip6_own_query);
2068 #endif
2069
2070 unlock:
2071 spin_unlock_bh(&br->multicast_lock);
2072
2073 return 0;
2074 }
2075
2076 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2077 {
2078 int err = -EINVAL;
2079 u32 old;
2080 struct net_bridge_mdb_htable *mdb;
2081
2082 spin_lock_bh(&br->multicast_lock);
2083 if (!is_power_of_2(val))
2084 goto unlock;
2085
2086 mdb = mlock_dereference(br->mdb, br);
2087 if (mdb && val < mdb->size)
2088 goto unlock;
2089
2090 err = 0;
2091
2092 old = br->hash_max;
2093 br->hash_max = val;
2094
2095 if (mdb) {
2096 if (mdb->old) {
2097 err = -EEXIST;
2098 rollback:
2099 br->hash_max = old;
2100 goto unlock;
2101 }
2102
2103 err = br_mdb_rehash(&br->mdb, br->hash_max,
2104 br->hash_elasticity);
2105 if (err)
2106 goto rollback;
2107 }
2108
2109 unlock:
2110 spin_unlock_bh(&br->multicast_lock);
2111
2112 return err;
2113 }
2114
2115 /**
2116 * br_multicast_list_adjacent - Returns snooped multicast addresses
2117 * @dev: The bridge port adjacent to which to retrieve addresses
2118 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2119 *
2120 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2121 * snooping feature on all bridge ports of dev's bridge device, excluding
2122 * the addresses from dev itself.
2123 *
2124 * Returns the number of items added to br_ip_list.
2125 *
2126 * Notes:
2127 * - br_ip_list needs to be initialized by caller
2128 * - br_ip_list might contain duplicates in the end
2129 * (needs to be taken care of by caller)
2130 * - br_ip_list needs to be freed by caller
2131 */
2132 int br_multicast_list_adjacent(struct net_device *dev,
2133 struct list_head *br_ip_list)
2134 {
2135 struct net_bridge *br;
2136 struct net_bridge_port *port;
2137 struct net_bridge_port_group *group;
2138 struct br_ip_list *entry;
2139 int count = 0;
2140
2141 rcu_read_lock();
2142 if (!br_ip_list || !br_port_exists(dev))
2143 goto unlock;
2144
2145 port = br_port_get_rcu(dev);
2146 if (!port || !port->br)
2147 goto unlock;
2148
2149 br = port->br;
2150
2151 list_for_each_entry_rcu(port, &br->port_list, list) {
2152 if (!port->dev || port->dev == dev)
2153 continue;
2154
2155 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2156 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2157 if (!entry)
2158 goto unlock;
2159
2160 entry->addr = group->addr;
2161 list_add(&entry->list, br_ip_list);
2162 count++;
2163 }
2164 }
2165
2166 unlock:
2167 rcu_read_unlock();
2168 return count;
2169 }
2170 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2171
2172 /**
2173 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2174 * @dev: The bridge port providing the bridge on which to check for a querier
2175 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2176 *
2177 * Checks whether the given interface has a bridge on top and if so returns
2178 * true if a valid querier exists anywhere on the bridged link layer.
2179 * Otherwise returns false.
2180 */
2181 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2182 {
2183 struct net_bridge *br;
2184 struct net_bridge_port *port;
2185 struct ethhdr eth;
2186 bool ret = false;
2187
2188 rcu_read_lock();
2189 if (!br_port_exists(dev))
2190 goto unlock;
2191
2192 port = br_port_get_rcu(dev);
2193 if (!port || !port->br)
2194 goto unlock;
2195
2196 br = port->br;
2197
2198 memset(&eth, 0, sizeof(eth));
2199 eth.h_proto = htons(proto);
2200
2201 ret = br_multicast_querier_exists(br, &eth);
2202
2203 unlock:
2204 rcu_read_unlock();
2205 return ret;
2206 }
2207 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2208
2209 /**
2210 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2211 * @dev: The bridge port adjacent to which to check for a querier
2212 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2213 *
2214 * Checks whether the given interface has a bridge on top and if so returns
2215 * true if a selected querier is behind one of the other ports of this
2216 * bridge. Otherwise returns false.
2217 */
2218 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2219 {
2220 struct net_bridge *br;
2221 struct net_bridge_port *port;
2222 bool ret = false;
2223
2224 rcu_read_lock();
2225 if (!br_port_exists(dev))
2226 goto unlock;
2227
2228 port = br_port_get_rcu(dev);
2229 if (!port || !port->br)
2230 goto unlock;
2231
2232 br = port->br;
2233
2234 switch (proto) {
2235 case ETH_P_IP:
2236 if (!timer_pending(&br->ip4_other_query.timer) ||
2237 rcu_dereference(br->ip4_querier.port) == port)
2238 goto unlock;
2239 break;
2240 #if IS_ENABLED(CONFIG_IPV6)
2241 case ETH_P_IPV6:
2242 if (!timer_pending(&br->ip6_other_query.timer) ||
2243 rcu_dereference(br->ip6_querier.port) == port)
2244 goto unlock;
2245 break;
2246 #endif
2247 default:
2248 goto unlock;
2249 }
2250
2251 ret = true;
2252 unlock:
2253 rcu_read_unlock();
2254 return ret;
2255 }
2256 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2257
2258 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
2259 const struct sk_buff *skb, u8 type, u8 dir)
2260 {
2261 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
2262 __be16 proto = skb->protocol;
2263 unsigned int t_len;
2264
2265 u64_stats_update_begin(&pstats->syncp);
2266 switch (proto) {
2267 case htons(ETH_P_IP):
2268 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
2269 switch (type) {
2270 case IGMP_HOST_MEMBERSHIP_REPORT:
2271 pstats->mstats.igmp_v1reports[dir]++;
2272 break;
2273 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2274 pstats->mstats.igmp_v2reports[dir]++;
2275 break;
2276 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2277 pstats->mstats.igmp_v3reports[dir]++;
2278 break;
2279 case IGMP_HOST_MEMBERSHIP_QUERY:
2280 if (t_len != sizeof(struct igmphdr)) {
2281 pstats->mstats.igmp_v3queries[dir]++;
2282 } else {
2283 unsigned int offset = skb_transport_offset(skb);
2284 struct igmphdr *ih, _ihdr;
2285
2286 ih = skb_header_pointer(skb, offset,
2287 sizeof(_ihdr), &_ihdr);
2288 if (!ih)
2289 break;
2290 if (!ih->code)
2291 pstats->mstats.igmp_v1queries[dir]++;
2292 else
2293 pstats->mstats.igmp_v2queries[dir]++;
2294 }
2295 break;
2296 case IGMP_HOST_LEAVE_MESSAGE:
2297 pstats->mstats.igmp_leaves[dir]++;
2298 break;
2299 }
2300 break;
2301 #if IS_ENABLED(CONFIG_IPV6)
2302 case htons(ETH_P_IPV6):
2303 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2304 sizeof(struct ipv6hdr);
2305 t_len -= skb_network_header_len(skb);
2306 switch (type) {
2307 case ICMPV6_MGM_REPORT:
2308 pstats->mstats.mld_v1reports[dir]++;
2309 break;
2310 case ICMPV6_MLD2_REPORT:
2311 pstats->mstats.mld_v2reports[dir]++;
2312 break;
2313 case ICMPV6_MGM_QUERY:
2314 if (t_len != sizeof(struct mld_msg))
2315 pstats->mstats.mld_v2queries[dir]++;
2316 else
2317 pstats->mstats.mld_v1queries[dir]++;
2318 break;
2319 case ICMPV6_MGM_REDUCTION:
2320 pstats->mstats.mld_leaves[dir]++;
2321 break;
2322 }
2323 break;
2324 #endif /* CONFIG_IPV6 */
2325 }
2326 u64_stats_update_end(&pstats->syncp);
2327 }
2328
2329 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
2330 const struct sk_buff *skb, u8 type, u8 dir)
2331 {
2332 struct bridge_mcast_stats __percpu *stats;
2333
2334 /* if multicast_disabled is true then igmp type can't be set */
2335 if (!type || !br->multicast_stats_enabled)
2336 return;
2337
2338 if (p)
2339 stats = p->mcast_stats;
2340 else
2341 stats = br->mcast_stats;
2342 if (WARN_ON(!stats))
2343 return;
2344
2345 br_mcast_stats_add(stats, skb, type, dir);
2346 }
2347
2348 int br_multicast_init_stats(struct net_bridge *br)
2349 {
2350 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2351 if (!br->mcast_stats)
2352 return -ENOMEM;
2353
2354 return 0;
2355 }
2356
2357 static void mcast_stats_add_dir(u64 *dst, u64 *src)
2358 {
2359 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2360 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2361 }
2362
2363 void br_multicast_get_stats(const struct net_bridge *br,
2364 const struct net_bridge_port *p,
2365 struct br_mcast_stats *dest)
2366 {
2367 struct bridge_mcast_stats __percpu *stats;
2368 struct br_mcast_stats tdst;
2369 int i;
2370
2371 memset(dest, 0, sizeof(*dest));
2372 if (p)
2373 stats = p->mcast_stats;
2374 else
2375 stats = br->mcast_stats;
2376 if (WARN_ON(!stats))
2377 return;
2378
2379 memset(&tdst, 0, sizeof(tdst));
2380 for_each_possible_cpu(i) {
2381 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2382 struct br_mcast_stats temp;
2383 unsigned int start;
2384
2385 do {
2386 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2387 memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2388 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2389
2390 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2391 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2392 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
2393 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2394 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2395 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2396 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2397 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2398
2399 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2400 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
2401 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2402 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2403 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2404 tdst.mld_parse_errors += temp.mld_parse_errors;
2405 }
2406 memcpy(dest, &tdst, sizeof(*dest));
2407 }
Linux with added FPC-III support