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Merge tag 'devicetree-fixes-for-5.14-1' of git://git.kernel.org/pub/scm/linux/kernel...
[thirdparty/linux.git] / net / bridge / br_multicast.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Bridge multicast support.
4 *
5 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
6 */
7
8 #include <linux/err.h>
9 #include <linux/export.h>
10 #include <linux/if_ether.h>
11 #include <linux/igmp.h>
12 #include <linux/in.h>
13 #include <linux/jhash.h>
14 #include <linux/kernel.h>
15 #include <linux/log2.h>
16 #include <linux/netdevice.h>
17 #include <linux/netfilter_bridge.h>
18 #include <linux/random.h>
19 #include <linux/rculist.h>
20 #include <linux/skbuff.h>
21 #include <linux/slab.h>
22 #include <linux/timer.h>
23 #include <linux/inetdevice.h>
24 #include <linux/mroute.h>
25 #include <net/ip.h>
26 #include <net/switchdev.h>
27 #if IS_ENABLED(CONFIG_IPV6)
28 #include <linux/icmpv6.h>
29 #include <net/ipv6.h>
30 #include <net/mld.h>
31 #include <net/ip6_checksum.h>
32 #include <net/addrconf.h>
33 #endif
34
35 #include "br_private.h"
36 #include "br_private_mcast_eht.h"
37
38 static const struct rhashtable_params br_mdb_rht_params = {
39 .head_offset = offsetof(struct net_bridge_mdb_entry, rhnode),
40 .key_offset = offsetof(struct net_bridge_mdb_entry, addr),
41 .key_len = sizeof(struct br_ip),
42 .automatic_shrinking = true,
43 };
44
45 static const struct rhashtable_params br_sg_port_rht_params = {
46 .head_offset = offsetof(struct net_bridge_port_group, rhnode),
47 .key_offset = offsetof(struct net_bridge_port_group, key),
48 .key_len = sizeof(struct net_bridge_port_group_sg_key),
49 .automatic_shrinking = true,
50 };
51
52 static void br_multicast_start_querier(struct net_bridge *br,
53 struct bridge_mcast_own_query *query);
54 static void br_ip4_multicast_add_router(struct net_bridge *br,
55 struct net_bridge_port *port);
56 static void br_ip4_multicast_leave_group(struct net_bridge *br,
57 struct net_bridge_port *port,
58 __be32 group,
59 __u16 vid,
60 const unsigned char *src);
61 static void br_multicast_port_group_rexmit(struct timer_list *t);
62
63 static void
64 br_multicast_rport_del_notify(struct net_bridge_port *p, bool deleted);
65 static void br_ip6_multicast_add_router(struct net_bridge *br,
66 struct net_bridge_port *port);
67 #if IS_ENABLED(CONFIG_IPV6)
68 static void br_ip6_multicast_leave_group(struct net_bridge *br,
69 struct net_bridge_port *port,
70 const struct in6_addr *group,
71 __u16 vid, const unsigned char *src);
72 #endif
73 static struct net_bridge_port_group *
74 __br_multicast_add_group(struct net_bridge *br,
75 struct net_bridge_port *port,
76 struct br_ip *group,
77 const unsigned char *src,
78 u8 filter_mode,
79 bool igmpv2_mldv1,
80 bool blocked);
81 static void br_multicast_find_del_pg(struct net_bridge *br,
82 struct net_bridge_port_group *pg);
83
84 static struct net_bridge_port_group *
85 br_sg_port_find(struct net_bridge *br,
86 struct net_bridge_port_group_sg_key *sg_p)
87 {
88 lockdep_assert_held_once(&br->multicast_lock);
89
90 return rhashtable_lookup_fast(&br->sg_port_tbl, sg_p,
91 br_sg_port_rht_params);
92 }
93
94 static struct net_bridge_mdb_entry *br_mdb_ip_get_rcu(struct net_bridge *br,
95 struct br_ip *dst)
96 {
97 return rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
98 }
99
100 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge *br,
101 struct br_ip *dst)
102 {
103 struct net_bridge_mdb_entry *ent;
104
105 lockdep_assert_held_once(&br->multicast_lock);
106
107 rcu_read_lock();
108 ent = rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
109 rcu_read_unlock();
110
111 return ent;
112 }
113
114 static struct net_bridge_mdb_entry *br_mdb_ip4_get(struct net_bridge *br,
115 __be32 dst, __u16 vid)
116 {
117 struct br_ip br_dst;
118
119 memset(&br_dst, 0, sizeof(br_dst));
120 br_dst.dst.ip4 = dst;
121 br_dst.proto = htons(ETH_P_IP);
122 br_dst.vid = vid;
123
124 return br_mdb_ip_get(br, &br_dst);
125 }
126
127 #if IS_ENABLED(CONFIG_IPV6)
128 static struct net_bridge_mdb_entry *br_mdb_ip6_get(struct net_bridge *br,
129 const struct in6_addr *dst,
130 __u16 vid)
131 {
132 struct br_ip br_dst;
133
134 memset(&br_dst, 0, sizeof(br_dst));
135 br_dst.dst.ip6 = *dst;
136 br_dst.proto = htons(ETH_P_IPV6);
137 br_dst.vid = vid;
138
139 return br_mdb_ip_get(br, &br_dst);
140 }
141 #endif
142
143 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
144 struct sk_buff *skb, u16 vid)
145 {
146 struct br_ip ip;
147
148 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
149 return NULL;
150
151 if (BR_INPUT_SKB_CB(skb)->igmp)
152 return NULL;
153
154 memset(&ip, 0, sizeof(ip));
155 ip.proto = skb->protocol;
156 ip.vid = vid;
157
158 switch (skb->protocol) {
159 case htons(ETH_P_IP):
160 ip.dst.ip4 = ip_hdr(skb)->daddr;
161 if (br->multicast_igmp_version == 3) {
162 struct net_bridge_mdb_entry *mdb;
163
164 ip.src.ip4 = ip_hdr(skb)->saddr;
165 mdb = br_mdb_ip_get_rcu(br, &ip);
166 if (mdb)
167 return mdb;
168 ip.src.ip4 = 0;
169 }
170 break;
171 #if IS_ENABLED(CONFIG_IPV6)
172 case htons(ETH_P_IPV6):
173 ip.dst.ip6 = ipv6_hdr(skb)->daddr;
174 if (br->multicast_mld_version == 2) {
175 struct net_bridge_mdb_entry *mdb;
176
177 ip.src.ip6 = ipv6_hdr(skb)->saddr;
178 mdb = br_mdb_ip_get_rcu(br, &ip);
179 if (mdb)
180 return mdb;
181 memset(&ip.src.ip6, 0, sizeof(ip.src.ip6));
182 }
183 break;
184 #endif
185 default:
186 ip.proto = 0;
187 ether_addr_copy(ip.dst.mac_addr, eth_hdr(skb)->h_dest);
188 }
189
190 return br_mdb_ip_get_rcu(br, &ip);
191 }
192
193 static bool br_port_group_equal(struct net_bridge_port_group *p,
194 struct net_bridge_port *port,
195 const unsigned char *src)
196 {
197 if (p->key.port != port)
198 return false;
199
200 if (!(port->flags & BR_MULTICAST_TO_UNICAST))
201 return true;
202
203 return ether_addr_equal(src, p->eth_addr);
204 }
205
206 static void __fwd_add_star_excl(struct net_bridge_port_group *pg,
207 struct br_ip *sg_ip)
208 {
209 struct net_bridge_port_group_sg_key sg_key;
210 struct net_bridge *br = pg->key.port->br;
211 struct net_bridge_port_group *src_pg;
212
213 memset(&sg_key, 0, sizeof(sg_key));
214 sg_key.port = pg->key.port;
215 sg_key.addr = *sg_ip;
216 if (br_sg_port_find(br, &sg_key))
217 return;
218
219 src_pg = __br_multicast_add_group(br, pg->key.port, sg_ip, pg->eth_addr,
220 MCAST_INCLUDE, false, false);
221 if (IS_ERR_OR_NULL(src_pg) ||
222 src_pg->rt_protocol != RTPROT_KERNEL)
223 return;
224
225 src_pg->flags |= MDB_PG_FLAGS_STAR_EXCL;
226 }
227
228 static void __fwd_del_star_excl(struct net_bridge_port_group *pg,
229 struct br_ip *sg_ip)
230 {
231 struct net_bridge_port_group_sg_key sg_key;
232 struct net_bridge *br = pg->key.port->br;
233 struct net_bridge_port_group *src_pg;
234
235 memset(&sg_key, 0, sizeof(sg_key));
236 sg_key.port = pg->key.port;
237 sg_key.addr = *sg_ip;
238 src_pg = br_sg_port_find(br, &sg_key);
239 if (!src_pg || !(src_pg->flags & MDB_PG_FLAGS_STAR_EXCL) ||
240 src_pg->rt_protocol != RTPROT_KERNEL)
241 return;
242
243 br_multicast_find_del_pg(br, src_pg);
244 }
245
246 /* When a port group transitions to (or is added as) EXCLUDE we need to add it
247 * to all other ports' S,G entries which are not blocked by the current group
248 * for proper replication, the assumption is that any S,G blocked entries
249 * are already added so the S,G,port lookup should skip them.
250 * When a port group transitions from EXCLUDE -> INCLUDE mode or is being
251 * deleted we need to remove it from all ports' S,G entries where it was
252 * automatically installed before (i.e. where it's MDB_PG_FLAGS_STAR_EXCL).
253 */
254 void br_multicast_star_g_handle_mode(struct net_bridge_port_group *pg,
255 u8 filter_mode)
256 {
257 struct net_bridge *br = pg->key.port->br;
258 struct net_bridge_port_group *pg_lst;
259 struct net_bridge_mdb_entry *mp;
260 struct br_ip sg_ip;
261
262 if (WARN_ON(!br_multicast_is_star_g(&pg->key.addr)))
263 return;
264
265 mp = br_mdb_ip_get(br, &pg->key.addr);
266 if (!mp)
267 return;
268
269 memset(&sg_ip, 0, sizeof(sg_ip));
270 sg_ip = pg->key.addr;
271 for (pg_lst = mlock_dereference(mp->ports, br);
272 pg_lst;
273 pg_lst = mlock_dereference(pg_lst->next, br)) {
274 struct net_bridge_group_src *src_ent;
275
276 if (pg_lst == pg)
277 continue;
278 hlist_for_each_entry(src_ent, &pg_lst->src_list, node) {
279 if (!(src_ent->flags & BR_SGRP_F_INSTALLED))
280 continue;
281 sg_ip.src = src_ent->addr.src;
282 switch (filter_mode) {
283 case MCAST_INCLUDE:
284 __fwd_del_star_excl(pg, &sg_ip);
285 break;
286 case MCAST_EXCLUDE:
287 __fwd_add_star_excl(pg, &sg_ip);
288 break;
289 }
290 }
291 }
292 }
293
294 /* called when adding a new S,G with host_joined == false by default */
295 static void br_multicast_sg_host_state(struct net_bridge_mdb_entry *star_mp,
296 struct net_bridge_port_group *sg)
297 {
298 struct net_bridge_mdb_entry *sg_mp;
299
300 if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr)))
301 return;
302 if (!star_mp->host_joined)
303 return;
304
305 sg_mp = br_mdb_ip_get(star_mp->br, &sg->key.addr);
306 if (!sg_mp)
307 return;
308 sg_mp->host_joined = true;
309 }
310
311 /* set the host_joined state of all of *,G's S,G entries */
312 static void br_multicast_star_g_host_state(struct net_bridge_mdb_entry *star_mp)
313 {
314 struct net_bridge *br = star_mp->br;
315 struct net_bridge_mdb_entry *sg_mp;
316 struct net_bridge_port_group *pg;
317 struct br_ip sg_ip;
318
319 if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr)))
320 return;
321
322 memset(&sg_ip, 0, sizeof(sg_ip));
323 sg_ip = star_mp->addr;
324 for (pg = mlock_dereference(star_mp->ports, br);
325 pg;
326 pg = mlock_dereference(pg->next, br)) {
327 struct net_bridge_group_src *src_ent;
328
329 hlist_for_each_entry(src_ent, &pg->src_list, node) {
330 if (!(src_ent->flags & BR_SGRP_F_INSTALLED))
331 continue;
332 sg_ip.src = src_ent->addr.src;
333 sg_mp = br_mdb_ip_get(br, &sg_ip);
334 if (!sg_mp)
335 continue;
336 sg_mp->host_joined = star_mp->host_joined;
337 }
338 }
339 }
340
341 static void br_multicast_sg_del_exclude_ports(struct net_bridge_mdb_entry *sgmp)
342 {
343 struct net_bridge_port_group __rcu **pp;
344 struct net_bridge_port_group *p;
345
346 /* *,G exclude ports are only added to S,G entries */
347 if (WARN_ON(br_multicast_is_star_g(&sgmp->addr)))
348 return;
349
350 /* we need the STAR_EXCLUDE ports if there are non-STAR_EXCLUDE ports
351 * we should ignore perm entries since they're managed by user-space
352 */
353 for (pp = &sgmp->ports;
354 (p = mlock_dereference(*pp, sgmp->br)) != NULL;
355 pp = &p->next)
356 if (!(p->flags & (MDB_PG_FLAGS_STAR_EXCL |
357 MDB_PG_FLAGS_PERMANENT)))
358 return;
359
360 /* currently the host can only have joined the *,G which means
361 * we treat it as EXCLUDE {}, so for an S,G it's considered a
362 * STAR_EXCLUDE entry and we can safely leave it
363 */
364 sgmp->host_joined = false;
365
366 for (pp = &sgmp->ports;
367 (p = mlock_dereference(*pp, sgmp->br)) != NULL;) {
368 if (!(p->flags & MDB_PG_FLAGS_PERMANENT))
369 br_multicast_del_pg(sgmp, p, pp);
370 else
371 pp = &p->next;
372 }
373 }
374
375 void br_multicast_sg_add_exclude_ports(struct net_bridge_mdb_entry *star_mp,
376 struct net_bridge_port_group *sg)
377 {
378 struct net_bridge_port_group_sg_key sg_key;
379 struct net_bridge *br = star_mp->br;
380 struct net_bridge_port_group *pg;
381
382 if (WARN_ON(br_multicast_is_star_g(&sg->key.addr)))
383 return;
384 if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr)))
385 return;
386
387 br_multicast_sg_host_state(star_mp, sg);
388 memset(&sg_key, 0, sizeof(sg_key));
389 sg_key.addr = sg->key.addr;
390 /* we need to add all exclude ports to the S,G */
391 for (pg = mlock_dereference(star_mp->ports, br);
392 pg;
393 pg = mlock_dereference(pg->next, br)) {
394 struct net_bridge_port_group *src_pg;
395
396 if (pg == sg || pg->filter_mode == MCAST_INCLUDE)
397 continue;
398
399 sg_key.port = pg->key.port;
400 if (br_sg_port_find(br, &sg_key))
401 continue;
402
403 src_pg = __br_multicast_add_group(br, pg->key.port,
404 &sg->key.addr,
405 sg->eth_addr,
406 MCAST_INCLUDE, false, false);
407 if (IS_ERR_OR_NULL(src_pg) ||
408 src_pg->rt_protocol != RTPROT_KERNEL)
409 continue;
410 src_pg->flags |= MDB_PG_FLAGS_STAR_EXCL;
411 }
412 }
413
414 static void br_multicast_fwd_src_add(struct net_bridge_group_src *src)
415 {
416 struct net_bridge_mdb_entry *star_mp;
417 struct net_bridge_port_group *sg;
418 struct br_ip sg_ip;
419
420 if (src->flags & BR_SGRP_F_INSTALLED)
421 return;
422
423 memset(&sg_ip, 0, sizeof(sg_ip));
424 sg_ip = src->pg->key.addr;
425 sg_ip.src = src->addr.src;
426 sg = __br_multicast_add_group(src->br, src->pg->key.port, &sg_ip,
427 src->pg->eth_addr, MCAST_INCLUDE, false,
428 !timer_pending(&src->timer));
429 if (IS_ERR_OR_NULL(sg))
430 return;
431 src->flags |= BR_SGRP_F_INSTALLED;
432 sg->flags &= ~MDB_PG_FLAGS_STAR_EXCL;
433
434 /* if it was added by user-space as perm we can skip next steps */
435 if (sg->rt_protocol != RTPROT_KERNEL &&
436 (sg->flags & MDB_PG_FLAGS_PERMANENT))
437 return;
438
439 /* the kernel is now responsible for removing this S,G */
440 del_timer(&sg->timer);
441 star_mp = br_mdb_ip_get(src->br, &src->pg->key.addr);
442 if (!star_mp)
443 return;
444
445 br_multicast_sg_add_exclude_ports(star_mp, sg);
446 }
447
448 static void br_multicast_fwd_src_remove(struct net_bridge_group_src *src,
449 bool fastleave)
450 {
451 struct net_bridge_port_group *p, *pg = src->pg;
452 struct net_bridge_port_group __rcu **pp;
453 struct net_bridge_mdb_entry *mp;
454 struct br_ip sg_ip;
455
456 memset(&sg_ip, 0, sizeof(sg_ip));
457 sg_ip = pg->key.addr;
458 sg_ip.src = src->addr.src;
459
460 mp = br_mdb_ip_get(src->br, &sg_ip);
461 if (!mp)
462 return;
463
464 for (pp = &mp->ports;
465 (p = mlock_dereference(*pp, src->br)) != NULL;
466 pp = &p->next) {
467 if (!br_port_group_equal(p, pg->key.port, pg->eth_addr))
468 continue;
469
470 if (p->rt_protocol != RTPROT_KERNEL &&
471 (p->flags & MDB_PG_FLAGS_PERMANENT))
472 break;
473
474 if (fastleave)
475 p->flags |= MDB_PG_FLAGS_FAST_LEAVE;
476 br_multicast_del_pg(mp, p, pp);
477 break;
478 }
479 src->flags &= ~BR_SGRP_F_INSTALLED;
480 }
481
482 /* install S,G and based on src's timer enable or disable forwarding */
483 static void br_multicast_fwd_src_handle(struct net_bridge_group_src *src)
484 {
485 struct net_bridge_port_group_sg_key sg_key;
486 struct net_bridge_port_group *sg;
487 u8 old_flags;
488
489 br_multicast_fwd_src_add(src);
490
491 memset(&sg_key, 0, sizeof(sg_key));
492 sg_key.addr = src->pg->key.addr;
493 sg_key.addr.src = src->addr.src;
494 sg_key.port = src->pg->key.port;
495
496 sg = br_sg_port_find(src->br, &sg_key);
497 if (!sg || (sg->flags & MDB_PG_FLAGS_PERMANENT))
498 return;
499
500 old_flags = sg->flags;
501 if (timer_pending(&src->timer))
502 sg->flags &= ~MDB_PG_FLAGS_BLOCKED;
503 else
504 sg->flags |= MDB_PG_FLAGS_BLOCKED;
505
506 if (old_flags != sg->flags) {
507 struct net_bridge_mdb_entry *sg_mp;
508
509 sg_mp = br_mdb_ip_get(src->br, &sg_key.addr);
510 if (!sg_mp)
511 return;
512 br_mdb_notify(src->br->dev, sg_mp, sg, RTM_NEWMDB);
513 }
514 }
515
516 static void br_multicast_destroy_mdb_entry(struct net_bridge_mcast_gc *gc)
517 {
518 struct net_bridge_mdb_entry *mp;
519
520 mp = container_of(gc, struct net_bridge_mdb_entry, mcast_gc);
521 WARN_ON(!hlist_unhashed(&mp->mdb_node));
522 WARN_ON(mp->ports);
523
524 del_timer_sync(&mp->timer);
525 kfree_rcu(mp, rcu);
526 }
527
528 static void br_multicast_del_mdb_entry(struct net_bridge_mdb_entry *mp)
529 {
530 struct net_bridge *br = mp->br;
531
532 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
533 br_mdb_rht_params);
534 hlist_del_init_rcu(&mp->mdb_node);
535 hlist_add_head(&mp->mcast_gc.gc_node, &br->mcast_gc_list);
536 queue_work(system_long_wq, &br->mcast_gc_work);
537 }
538
539 static void br_multicast_group_expired(struct timer_list *t)
540 {
541 struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer);
542 struct net_bridge *br = mp->br;
543
544 spin_lock(&br->multicast_lock);
545 if (hlist_unhashed(&mp->mdb_node) || !netif_running(br->dev) ||
546 timer_pending(&mp->timer))
547 goto out;
548
549 br_multicast_host_leave(mp, true);
550
551 if (mp->ports)
552 goto out;
553 br_multicast_del_mdb_entry(mp);
554 out:
555 spin_unlock(&br->multicast_lock);
556 }
557
558 static void br_multicast_destroy_group_src(struct net_bridge_mcast_gc *gc)
559 {
560 struct net_bridge_group_src *src;
561
562 src = container_of(gc, struct net_bridge_group_src, mcast_gc);
563 WARN_ON(!hlist_unhashed(&src->node));
564
565 del_timer_sync(&src->timer);
566 kfree_rcu(src, rcu);
567 }
568
569 void br_multicast_del_group_src(struct net_bridge_group_src *src,
570 bool fastleave)
571 {
572 struct net_bridge *br = src->pg->key.port->br;
573
574 br_multicast_fwd_src_remove(src, fastleave);
575 hlist_del_init_rcu(&src->node);
576 src->pg->src_ents--;
577 hlist_add_head(&src->mcast_gc.gc_node, &br->mcast_gc_list);
578 queue_work(system_long_wq, &br->mcast_gc_work);
579 }
580
581 static void br_multicast_destroy_port_group(struct net_bridge_mcast_gc *gc)
582 {
583 struct net_bridge_port_group *pg;
584
585 pg = container_of(gc, struct net_bridge_port_group, mcast_gc);
586 WARN_ON(!hlist_unhashed(&pg->mglist));
587 WARN_ON(!hlist_empty(&pg->src_list));
588
589 del_timer_sync(&pg->rexmit_timer);
590 del_timer_sync(&pg->timer);
591 kfree_rcu(pg, rcu);
592 }
593
594 void br_multicast_del_pg(struct net_bridge_mdb_entry *mp,
595 struct net_bridge_port_group *pg,
596 struct net_bridge_port_group __rcu **pp)
597 {
598 struct net_bridge *br = pg->key.port->br;
599 struct net_bridge_group_src *ent;
600 struct hlist_node *tmp;
601
602 rcu_assign_pointer(*pp, pg->next);
603 hlist_del_init(&pg->mglist);
604 br_multicast_eht_clean_sets(pg);
605 hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node)
606 br_multicast_del_group_src(ent, false);
607 br_mdb_notify(br->dev, mp, pg, RTM_DELMDB);
608 if (!br_multicast_is_star_g(&mp->addr)) {
609 rhashtable_remove_fast(&br->sg_port_tbl, &pg->rhnode,
610 br_sg_port_rht_params);
611 br_multicast_sg_del_exclude_ports(mp);
612 } else {
613 br_multicast_star_g_handle_mode(pg, MCAST_INCLUDE);
614 }
615 hlist_add_head(&pg->mcast_gc.gc_node, &br->mcast_gc_list);
616 queue_work(system_long_wq, &br->mcast_gc_work);
617
618 if (!mp->ports && !mp->host_joined && netif_running(br->dev))
619 mod_timer(&mp->timer, jiffies);
620 }
621
622 static void br_multicast_find_del_pg(struct net_bridge *br,
623 struct net_bridge_port_group *pg)
624 {
625 struct net_bridge_port_group __rcu **pp;
626 struct net_bridge_mdb_entry *mp;
627 struct net_bridge_port_group *p;
628
629 mp = br_mdb_ip_get(br, &pg->key.addr);
630 if (WARN_ON(!mp))
631 return;
632
633 for (pp = &mp->ports;
634 (p = mlock_dereference(*pp, br)) != NULL;
635 pp = &p->next) {
636 if (p != pg)
637 continue;
638
639 br_multicast_del_pg(mp, pg, pp);
640 return;
641 }
642
643 WARN_ON(1);
644 }
645
646 static void br_multicast_port_group_expired(struct timer_list *t)
647 {
648 struct net_bridge_port_group *pg = from_timer(pg, t, timer);
649 struct net_bridge_group_src *src_ent;
650 struct net_bridge *br = pg->key.port->br;
651 struct hlist_node *tmp;
652 bool changed;
653
654 spin_lock(&br->multicast_lock);
655 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
656 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
657 goto out;
658
659 changed = !!(pg->filter_mode == MCAST_EXCLUDE);
660 pg->filter_mode = MCAST_INCLUDE;
661 hlist_for_each_entry_safe(src_ent, tmp, &pg->src_list, node) {
662 if (!timer_pending(&src_ent->timer)) {
663 br_multicast_del_group_src(src_ent, false);
664 changed = true;
665 }
666 }
667
668 if (hlist_empty(&pg->src_list)) {
669 br_multicast_find_del_pg(br, pg);
670 } else if (changed) {
671 struct net_bridge_mdb_entry *mp = br_mdb_ip_get(br, &pg->key.addr);
672
673 if (changed && br_multicast_is_star_g(&pg->key.addr))
674 br_multicast_star_g_handle_mode(pg, MCAST_INCLUDE);
675
676 if (WARN_ON(!mp))
677 goto out;
678 br_mdb_notify(br->dev, mp, pg, RTM_NEWMDB);
679 }
680 out:
681 spin_unlock(&br->multicast_lock);
682 }
683
684 static void br_multicast_gc(struct hlist_head *head)
685 {
686 struct net_bridge_mcast_gc *gcent;
687 struct hlist_node *tmp;
688
689 hlist_for_each_entry_safe(gcent, tmp, head, gc_node) {
690 hlist_del_init(&gcent->gc_node);
691 gcent->destroy(gcent);
692 }
693 }
694
695 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
696 struct net_bridge_port_group *pg,
697 __be32 ip_dst, __be32 group,
698 bool with_srcs, bool over_lmqt,
699 u8 sflag, u8 *igmp_type,
700 bool *need_rexmit)
701 {
702 struct net_bridge_port *p = pg ? pg->key.port : NULL;
703 struct net_bridge_group_src *ent;
704 size_t pkt_size, igmp_hdr_size;
705 unsigned long now = jiffies;
706 struct igmpv3_query *ihv3;
707 void *csum_start = NULL;
708 __sum16 *csum = NULL;
709 struct sk_buff *skb;
710 struct igmphdr *ih;
711 struct ethhdr *eth;
712 unsigned long lmqt;
713 struct iphdr *iph;
714 u16 lmqt_srcs = 0;
715
716 igmp_hdr_size = sizeof(*ih);
717 if (br->multicast_igmp_version == 3) {
718 igmp_hdr_size = sizeof(*ihv3);
719 if (pg && with_srcs) {
720 lmqt = now + (br->multicast_last_member_interval *
721 br->multicast_last_member_count);
722 hlist_for_each_entry(ent, &pg->src_list, node) {
723 if (over_lmqt == time_after(ent->timer.expires,
724 lmqt) &&
725 ent->src_query_rexmit_cnt > 0)
726 lmqt_srcs++;
727 }
728
729 if (!lmqt_srcs)
730 return NULL;
731 igmp_hdr_size += lmqt_srcs * sizeof(__be32);
732 }
733 }
734
735 pkt_size = sizeof(*eth) + sizeof(*iph) + 4 + igmp_hdr_size;
736 if ((p && pkt_size > p->dev->mtu) ||
737 pkt_size > br->dev->mtu)
738 return NULL;
739
740 skb = netdev_alloc_skb_ip_align(br->dev, pkt_size);
741 if (!skb)
742 goto out;
743
744 skb->protocol = htons(ETH_P_IP);
745
746 skb_reset_mac_header(skb);
747 eth = eth_hdr(skb);
748
749 ether_addr_copy(eth->h_source, br->dev->dev_addr);
750 ip_eth_mc_map(ip_dst, eth->h_dest);
751 eth->h_proto = htons(ETH_P_IP);
752 skb_put(skb, sizeof(*eth));
753
754 skb_set_network_header(skb, skb->len);
755 iph = ip_hdr(skb);
756 iph->tot_len = htons(pkt_size - sizeof(*eth));
757
758 iph->version = 4;
759 iph->ihl = 6;
760 iph->tos = 0xc0;
761 iph->id = 0;
762 iph->frag_off = htons(IP_DF);
763 iph->ttl = 1;
764 iph->protocol = IPPROTO_IGMP;
765 iph->saddr = br_opt_get(br, BROPT_MULTICAST_QUERY_USE_IFADDR) ?
766 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
767 iph->daddr = ip_dst;
768 ((u8 *)&iph[1])[0] = IPOPT_RA;
769 ((u8 *)&iph[1])[1] = 4;
770 ((u8 *)&iph[1])[2] = 0;
771 ((u8 *)&iph[1])[3] = 0;
772 ip_send_check(iph);
773 skb_put(skb, 24);
774
775 skb_set_transport_header(skb, skb->len);
776 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
777
778 switch (br->multicast_igmp_version) {
779 case 2:
780 ih = igmp_hdr(skb);
781 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
782 ih->code = (group ? br->multicast_last_member_interval :
783 br->multicast_query_response_interval) /
784 (HZ / IGMP_TIMER_SCALE);
785 ih->group = group;
786 ih->csum = 0;
787 csum = &ih->csum;
788 csum_start = (void *)ih;
789 break;
790 case 3:
791 ihv3 = igmpv3_query_hdr(skb);
792 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
793 ihv3->code = (group ? br->multicast_last_member_interval :
794 br->multicast_query_response_interval) /
795 (HZ / IGMP_TIMER_SCALE);
796 ihv3->group = group;
797 ihv3->qqic = br->multicast_query_interval / HZ;
798 ihv3->nsrcs = htons(lmqt_srcs);
799 ihv3->resv = 0;
800 ihv3->suppress = sflag;
801 ihv3->qrv = 2;
802 ihv3->csum = 0;
803 csum = &ihv3->csum;
804 csum_start = (void *)ihv3;
805 if (!pg || !with_srcs)
806 break;
807
808 lmqt_srcs = 0;
809 hlist_for_each_entry(ent, &pg->src_list, node) {
810 if (over_lmqt == time_after(ent->timer.expires,
811 lmqt) &&
812 ent->src_query_rexmit_cnt > 0) {
813 ihv3->srcs[lmqt_srcs++] = ent->addr.src.ip4;
814 ent->src_query_rexmit_cnt--;
815 if (need_rexmit && ent->src_query_rexmit_cnt)
816 *need_rexmit = true;
817 }
818 }
819 if (WARN_ON(lmqt_srcs != ntohs(ihv3->nsrcs))) {
820 kfree_skb(skb);
821 return NULL;
822 }
823 break;
824 }
825
826 if (WARN_ON(!csum || !csum_start)) {
827 kfree_skb(skb);
828 return NULL;
829 }
830
831 *csum = ip_compute_csum(csum_start, igmp_hdr_size);
832 skb_put(skb, igmp_hdr_size);
833 __skb_pull(skb, sizeof(*eth));
834
835 out:
836 return skb;
837 }
838
839 #if IS_ENABLED(CONFIG_IPV6)
840 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
841 struct net_bridge_port_group *pg,
842 const struct in6_addr *ip6_dst,
843 const struct in6_addr *group,
844 bool with_srcs, bool over_llqt,
845 u8 sflag, u8 *igmp_type,
846 bool *need_rexmit)
847 {
848 struct net_bridge_port *p = pg ? pg->key.port : NULL;
849 struct net_bridge_group_src *ent;
850 size_t pkt_size, mld_hdr_size;
851 unsigned long now = jiffies;
852 struct mld2_query *mld2q;
853 void *csum_start = NULL;
854 unsigned long interval;
855 __sum16 *csum = NULL;
856 struct ipv6hdr *ip6h;
857 struct mld_msg *mldq;
858 struct sk_buff *skb;
859 unsigned long llqt;
860 struct ethhdr *eth;
861 u16 llqt_srcs = 0;
862 u8 *hopopt;
863
864 mld_hdr_size = sizeof(*mldq);
865 if (br->multicast_mld_version == 2) {
866 mld_hdr_size = sizeof(*mld2q);
867 if (pg && with_srcs) {
868 llqt = now + (br->multicast_last_member_interval *
869 br->multicast_last_member_count);
870 hlist_for_each_entry(ent, &pg->src_list, node) {
871 if (over_llqt == time_after(ent->timer.expires,
872 llqt) &&
873 ent->src_query_rexmit_cnt > 0)
874 llqt_srcs++;
875 }
876
877 if (!llqt_srcs)
878 return NULL;
879 mld_hdr_size += llqt_srcs * sizeof(struct in6_addr);
880 }
881 }
882
883 pkt_size = sizeof(*eth) + sizeof(*ip6h) + 8 + mld_hdr_size;
884 if ((p && pkt_size > p->dev->mtu) ||
885 pkt_size > br->dev->mtu)
886 return NULL;
887
888 skb = netdev_alloc_skb_ip_align(br->dev, pkt_size);
889 if (!skb)
890 goto out;
891
892 skb->protocol = htons(ETH_P_IPV6);
893
894 /* Ethernet header */
895 skb_reset_mac_header(skb);
896 eth = eth_hdr(skb);
897
898 ether_addr_copy(eth->h_source, br->dev->dev_addr);
899 eth->h_proto = htons(ETH_P_IPV6);
900 skb_put(skb, sizeof(*eth));
901
902 /* IPv6 header + HbH option */
903 skb_set_network_header(skb, skb->len);
904 ip6h = ipv6_hdr(skb);
905
906 *(__force __be32 *)ip6h = htonl(0x60000000);
907 ip6h->payload_len = htons(8 + mld_hdr_size);
908 ip6h->nexthdr = IPPROTO_HOPOPTS;
909 ip6h->hop_limit = 1;
910 ip6h->daddr = *ip6_dst;
911 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
912 &ip6h->saddr)) {
913 kfree_skb(skb);
914 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, false);
915 return NULL;
916 }
917
918 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
919 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
920
921 hopopt = (u8 *)(ip6h + 1);
922 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
923 hopopt[1] = 0; /* length of HbH */
924 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
925 hopopt[3] = 2; /* Length of RA Option */
926 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
927 hopopt[5] = 0;
928 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
929 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
930
931 skb_put(skb, sizeof(*ip6h) + 8);
932
933 /* ICMPv6 */
934 skb_set_transport_header(skb, skb->len);
935 interval = ipv6_addr_any(group) ?
936 br->multicast_query_response_interval :
937 br->multicast_last_member_interval;
938 *igmp_type = ICMPV6_MGM_QUERY;
939 switch (br->multicast_mld_version) {
940 case 1:
941 mldq = (struct mld_msg *)icmp6_hdr(skb);
942 mldq->mld_type = ICMPV6_MGM_QUERY;
943 mldq->mld_code = 0;
944 mldq->mld_cksum = 0;
945 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
946 mldq->mld_reserved = 0;
947 mldq->mld_mca = *group;
948 csum = &mldq->mld_cksum;
949 csum_start = (void *)mldq;
950 break;
951 case 2:
952 mld2q = (struct mld2_query *)icmp6_hdr(skb);
953 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
954 mld2q->mld2q_type = ICMPV6_MGM_QUERY;
955 mld2q->mld2q_code = 0;
956 mld2q->mld2q_cksum = 0;
957 mld2q->mld2q_resv1 = 0;
958 mld2q->mld2q_resv2 = 0;
959 mld2q->mld2q_suppress = sflag;
960 mld2q->mld2q_qrv = 2;
961 mld2q->mld2q_nsrcs = htons(llqt_srcs);
962 mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
963 mld2q->mld2q_mca = *group;
964 csum = &mld2q->mld2q_cksum;
965 csum_start = (void *)mld2q;
966 if (!pg || !with_srcs)
967 break;
968
969 llqt_srcs = 0;
970 hlist_for_each_entry(ent, &pg->src_list, node) {
971 if (over_llqt == time_after(ent->timer.expires,
972 llqt) &&
973 ent->src_query_rexmit_cnt > 0) {
974 mld2q->mld2q_srcs[llqt_srcs++] = ent->addr.src.ip6;
975 ent->src_query_rexmit_cnt--;
976 if (need_rexmit && ent->src_query_rexmit_cnt)
977 *need_rexmit = true;
978 }
979 }
980 if (WARN_ON(llqt_srcs != ntohs(mld2q->mld2q_nsrcs))) {
981 kfree_skb(skb);
982 return NULL;
983 }
984 break;
985 }
986
987 if (WARN_ON(!csum || !csum_start)) {
988 kfree_skb(skb);
989 return NULL;
990 }
991
992 *csum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, mld_hdr_size,
993 IPPROTO_ICMPV6,
994 csum_partial(csum_start, mld_hdr_size, 0));
995 skb_put(skb, mld_hdr_size);
996 __skb_pull(skb, sizeof(*eth));
997
998 out:
999 return skb;
1000 }
1001 #endif
1002
1003 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
1004 struct net_bridge_port_group *pg,
1005 struct br_ip *ip_dst,
1006 struct br_ip *group,
1007 bool with_srcs, bool over_lmqt,
1008 u8 sflag, u8 *igmp_type,
1009 bool *need_rexmit)
1010 {
1011 __be32 ip4_dst;
1012
1013 switch (group->proto) {
1014 case htons(ETH_P_IP):
1015 ip4_dst = ip_dst ? ip_dst->dst.ip4 : htonl(INADDR_ALLHOSTS_GROUP);
1016 return br_ip4_multicast_alloc_query(br, pg,
1017 ip4_dst, group->dst.ip4,
1018 with_srcs, over_lmqt,
1019 sflag, igmp_type,
1020 need_rexmit);
1021 #if IS_ENABLED(CONFIG_IPV6)
1022 case htons(ETH_P_IPV6): {
1023 struct in6_addr ip6_dst;
1024
1025 if (ip_dst)
1026 ip6_dst = ip_dst->dst.ip6;
1027 else
1028 ipv6_addr_set(&ip6_dst, htonl(0xff020000), 0, 0,
1029 htonl(1));
1030
1031 return br_ip6_multicast_alloc_query(br, pg,
1032 &ip6_dst, &group->dst.ip6,
1033 with_srcs, over_lmqt,
1034 sflag, igmp_type,
1035 need_rexmit);
1036 }
1037 #endif
1038 }
1039 return NULL;
1040 }
1041
1042 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
1043 struct br_ip *group)
1044 {
1045 struct net_bridge_mdb_entry *mp;
1046 int err;
1047
1048 mp = br_mdb_ip_get(br, group);
1049 if (mp)
1050 return mp;
1051
1052 if (atomic_read(&br->mdb_hash_tbl.nelems) >= br->hash_max) {
1053 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false);
1054 return ERR_PTR(-E2BIG);
1055 }
1056
1057 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
1058 if (unlikely(!mp))
1059 return ERR_PTR(-ENOMEM);
1060
1061 mp->br = br;
1062 mp->addr = *group;
1063 mp->mcast_gc.destroy = br_multicast_destroy_mdb_entry;
1064 timer_setup(&mp->timer, br_multicast_group_expired, 0);
1065 err = rhashtable_lookup_insert_fast(&br->mdb_hash_tbl, &mp->rhnode,
1066 br_mdb_rht_params);
1067 if (err) {
1068 kfree(mp);
1069 mp = ERR_PTR(err);
1070 } else {
1071 hlist_add_head_rcu(&mp->mdb_node, &br->mdb_list);
1072 }
1073
1074 return mp;
1075 }
1076
1077 static void br_multicast_group_src_expired(struct timer_list *t)
1078 {
1079 struct net_bridge_group_src *src = from_timer(src, t, timer);
1080 struct net_bridge_port_group *pg;
1081 struct net_bridge *br = src->br;
1082
1083 spin_lock(&br->multicast_lock);
1084 if (hlist_unhashed(&src->node) || !netif_running(br->dev) ||
1085 timer_pending(&src->timer))
1086 goto out;
1087
1088 pg = src->pg;
1089 if (pg->filter_mode == MCAST_INCLUDE) {
1090 br_multicast_del_group_src(src, false);
1091 if (!hlist_empty(&pg->src_list))
1092 goto out;
1093 br_multicast_find_del_pg(br, pg);
1094 } else {
1095 br_multicast_fwd_src_handle(src);
1096 }
1097
1098 out:
1099 spin_unlock(&br->multicast_lock);
1100 }
1101
1102 struct net_bridge_group_src *
1103 br_multicast_find_group_src(struct net_bridge_port_group *pg, struct br_ip *ip)
1104 {
1105 struct net_bridge_group_src *ent;
1106
1107 switch (ip->proto) {
1108 case htons(ETH_P_IP):
1109 hlist_for_each_entry(ent, &pg->src_list, node)
1110 if (ip->src.ip4 == ent->addr.src.ip4)
1111 return ent;
1112 break;
1113 #if IS_ENABLED(CONFIG_IPV6)
1114 case htons(ETH_P_IPV6):
1115 hlist_for_each_entry(ent, &pg->src_list, node)
1116 if (!ipv6_addr_cmp(&ent->addr.src.ip6, &ip->src.ip6))
1117 return ent;
1118 break;
1119 #endif
1120 }
1121
1122 return NULL;
1123 }
1124
1125 static struct net_bridge_group_src *
1126 br_multicast_new_group_src(struct net_bridge_port_group *pg, struct br_ip *src_ip)
1127 {
1128 struct net_bridge_group_src *grp_src;
1129
1130 if (unlikely(pg->src_ents >= PG_SRC_ENT_LIMIT))
1131 return NULL;
1132
1133 switch (src_ip->proto) {
1134 case htons(ETH_P_IP):
1135 if (ipv4_is_zeronet(src_ip->src.ip4) ||
1136 ipv4_is_multicast(src_ip->src.ip4))
1137 return NULL;
1138 break;
1139 #if IS_ENABLED(CONFIG_IPV6)
1140 case htons(ETH_P_IPV6):
1141 if (ipv6_addr_any(&src_ip->src.ip6) ||
1142 ipv6_addr_is_multicast(&src_ip->src.ip6))
1143 return NULL;
1144 break;
1145 #endif
1146 }
1147
1148 grp_src = kzalloc(sizeof(*grp_src), GFP_ATOMIC);
1149 if (unlikely(!grp_src))
1150 return NULL;
1151
1152 grp_src->pg = pg;
1153 grp_src->br = pg->key.port->br;
1154 grp_src->addr = *src_ip;
1155 grp_src->mcast_gc.destroy = br_multicast_destroy_group_src;
1156 timer_setup(&grp_src->timer, br_multicast_group_src_expired, 0);
1157
1158 hlist_add_head_rcu(&grp_src->node, &pg->src_list);
1159 pg->src_ents++;
1160
1161 return grp_src;
1162 }
1163
1164 struct net_bridge_port_group *br_multicast_new_port_group(
1165 struct net_bridge_port *port,
1166 struct br_ip *group,
1167 struct net_bridge_port_group __rcu *next,
1168 unsigned char flags,
1169 const unsigned char *src,
1170 u8 filter_mode,
1171 u8 rt_protocol)
1172 {
1173 struct net_bridge_port_group *p;
1174
1175 p = kzalloc(sizeof(*p), GFP_ATOMIC);
1176 if (unlikely(!p))
1177 return NULL;
1178
1179 p->key.addr = *group;
1180 p->key.port = port;
1181 p->flags = flags;
1182 p->filter_mode = filter_mode;
1183 p->rt_protocol = rt_protocol;
1184 p->eht_host_tree = RB_ROOT;
1185 p->eht_set_tree = RB_ROOT;
1186 p->mcast_gc.destroy = br_multicast_destroy_port_group;
1187 INIT_HLIST_HEAD(&p->src_list);
1188
1189 if (!br_multicast_is_star_g(group) &&
1190 rhashtable_lookup_insert_fast(&port->br->sg_port_tbl, &p->rhnode,
1191 br_sg_port_rht_params)) {
1192 kfree(p);
1193 return NULL;
1194 }
1195
1196 rcu_assign_pointer(p->next, next);
1197 timer_setup(&p->timer, br_multicast_port_group_expired, 0);
1198 timer_setup(&p->rexmit_timer, br_multicast_port_group_rexmit, 0);
1199 hlist_add_head(&p->mglist, &port->mglist);
1200
1201 if (src)
1202 memcpy(p->eth_addr, src, ETH_ALEN);
1203 else
1204 eth_broadcast_addr(p->eth_addr);
1205
1206 return p;
1207 }
1208
1209 void br_multicast_host_join(struct net_bridge_mdb_entry *mp, bool notify)
1210 {
1211 if (!mp->host_joined) {
1212 mp->host_joined = true;
1213 if (br_multicast_is_star_g(&mp->addr))
1214 br_multicast_star_g_host_state(mp);
1215 if (notify)
1216 br_mdb_notify(mp->br->dev, mp, NULL, RTM_NEWMDB);
1217 }
1218
1219 if (br_group_is_l2(&mp->addr))
1220 return;
1221
1222 mod_timer(&mp->timer, jiffies + mp->br->multicast_membership_interval);
1223 }
1224
1225 void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify)
1226 {
1227 if (!mp->host_joined)
1228 return;
1229
1230 mp->host_joined = false;
1231 if (br_multicast_is_star_g(&mp->addr))
1232 br_multicast_star_g_host_state(mp);
1233 if (notify)
1234 br_mdb_notify(mp->br->dev, mp, NULL, RTM_DELMDB);
1235 }
1236
1237 static struct net_bridge_port_group *
1238 __br_multicast_add_group(struct net_bridge *br,
1239 struct net_bridge_port *port,
1240 struct br_ip *group,
1241 const unsigned char *src,
1242 u8 filter_mode,
1243 bool igmpv2_mldv1,
1244 bool blocked)
1245 {
1246 struct net_bridge_port_group __rcu **pp;
1247 struct net_bridge_port_group *p = NULL;
1248 struct net_bridge_mdb_entry *mp;
1249 unsigned long now = jiffies;
1250
1251 if (!netif_running(br->dev) ||
1252 (port && port->state == BR_STATE_DISABLED))
1253 goto out;
1254
1255 mp = br_multicast_new_group(br, group);
1256 if (IS_ERR(mp))
1257 return ERR_CAST(mp);
1258
1259 if (!port) {
1260 br_multicast_host_join(mp, true);
1261 goto out;
1262 }
1263
1264 for (pp = &mp->ports;
1265 (p = mlock_dereference(*pp, br)) != NULL;
1266 pp = &p->next) {
1267 if (br_port_group_equal(p, port, src))
1268 goto found;
1269 if ((unsigned long)p->key.port < (unsigned long)port)
1270 break;
1271 }
1272
1273 p = br_multicast_new_port_group(port, group, *pp, 0, src,
1274 filter_mode, RTPROT_KERNEL);
1275 if (unlikely(!p)) {
1276 p = ERR_PTR(-ENOMEM);
1277 goto out;
1278 }
1279 rcu_assign_pointer(*pp, p);
1280 if (blocked)
1281 p->flags |= MDB_PG_FLAGS_BLOCKED;
1282 br_mdb_notify(br->dev, mp, p, RTM_NEWMDB);
1283
1284 found:
1285 if (igmpv2_mldv1)
1286 mod_timer(&p->timer, now + br->multicast_membership_interval);
1287
1288 out:
1289 return p;
1290 }
1291
1292 static int br_multicast_add_group(struct net_bridge *br,
1293 struct net_bridge_port *port,
1294 struct br_ip *group,
1295 const unsigned char *src,
1296 u8 filter_mode,
1297 bool igmpv2_mldv1)
1298 {
1299 struct net_bridge_port_group *pg;
1300 int err;
1301
1302 spin_lock(&br->multicast_lock);
1303 pg = __br_multicast_add_group(br, port, group, src, filter_mode,
1304 igmpv2_mldv1, false);
1305 /* NULL is considered valid for host joined groups */
1306 err = PTR_ERR_OR_ZERO(pg);
1307 spin_unlock(&br->multicast_lock);
1308
1309 return err;
1310 }
1311
1312 static int br_ip4_multicast_add_group(struct net_bridge *br,
1313 struct net_bridge_port *port,
1314 __be32 group,
1315 __u16 vid,
1316 const unsigned char *src,
1317 bool igmpv2)
1318 {
1319 struct br_ip br_group;
1320 u8 filter_mode;
1321
1322 if (ipv4_is_local_multicast(group))
1323 return 0;
1324
1325 memset(&br_group, 0, sizeof(br_group));
1326 br_group.dst.ip4 = group;
1327 br_group.proto = htons(ETH_P_IP);
1328 br_group.vid = vid;
1329 filter_mode = igmpv2 ? MCAST_EXCLUDE : MCAST_INCLUDE;
1330
1331 return br_multicast_add_group(br, port, &br_group, src, filter_mode,
1332 igmpv2);
1333 }
1334
1335 #if IS_ENABLED(CONFIG_IPV6)
1336 static int br_ip6_multicast_add_group(struct net_bridge *br,
1337 struct net_bridge_port *port,
1338 const struct in6_addr *group,
1339 __u16 vid,
1340 const unsigned char *src,
1341 bool mldv1)
1342 {
1343 struct br_ip br_group;
1344 u8 filter_mode;
1345
1346 if (ipv6_addr_is_ll_all_nodes(group))
1347 return 0;
1348
1349 memset(&br_group, 0, sizeof(br_group));
1350 br_group.dst.ip6 = *group;
1351 br_group.proto = htons(ETH_P_IPV6);
1352 br_group.vid = vid;
1353 filter_mode = mldv1 ? MCAST_EXCLUDE : MCAST_INCLUDE;
1354
1355 return br_multicast_add_group(br, port, &br_group, src, filter_mode,
1356 mldv1);
1357 }
1358 #endif
1359
1360 static bool br_multicast_rport_del(struct hlist_node *rlist)
1361 {
1362 if (hlist_unhashed(rlist))
1363 return false;
1364
1365 hlist_del_init_rcu(rlist);
1366 return true;
1367 }
1368
1369 static bool br_ip4_multicast_rport_del(struct net_bridge_port *p)
1370 {
1371 return br_multicast_rport_del(&p->ip4_rlist);
1372 }
1373
1374 static bool br_ip6_multicast_rport_del(struct net_bridge_port *p)
1375 {
1376 #if IS_ENABLED(CONFIG_IPV6)
1377 return br_multicast_rport_del(&p->ip6_rlist);
1378 #else
1379 return false;
1380 #endif
1381 }
1382
1383 static void br_multicast_router_expired(struct net_bridge_port *port,
1384 struct timer_list *t,
1385 struct hlist_node *rlist)
1386 {
1387 struct net_bridge *br = port->br;
1388 bool del;
1389
1390 spin_lock(&br->multicast_lock);
1391 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1392 port->multicast_router == MDB_RTR_TYPE_PERM ||
1393 timer_pending(t))
1394 goto out;
1395
1396 del = br_multicast_rport_del(rlist);
1397 br_multicast_rport_del_notify(port, del);
1398 out:
1399 spin_unlock(&br->multicast_lock);
1400 }
1401
1402 static void br_ip4_multicast_router_expired(struct timer_list *t)
1403 {
1404 struct net_bridge_port *port = from_timer(port, t, ip4_mc_router_timer);
1405
1406 br_multicast_router_expired(port, t, &port->ip4_rlist);
1407 }
1408
1409 #if IS_ENABLED(CONFIG_IPV6)
1410 static void br_ip6_multicast_router_expired(struct timer_list *t)
1411 {
1412 struct net_bridge_port *port = from_timer(port, t, ip6_mc_router_timer);
1413
1414 br_multicast_router_expired(port, t, &port->ip6_rlist);
1415 }
1416 #endif
1417
1418 static void br_mc_router_state_change(struct net_bridge *p,
1419 bool is_mc_router)
1420 {
1421 struct switchdev_attr attr = {
1422 .orig_dev = p->dev,
1423 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
1424 .flags = SWITCHDEV_F_DEFER,
1425 .u.mrouter = is_mc_router,
1426 };
1427
1428 switchdev_port_attr_set(p->dev, &attr, NULL);
1429 }
1430
1431 static void br_multicast_local_router_expired(struct net_bridge *br,
1432 struct timer_list *timer)
1433 {
1434 spin_lock(&br->multicast_lock);
1435 if (br->multicast_router == MDB_RTR_TYPE_DISABLED ||
1436 br->multicast_router == MDB_RTR_TYPE_PERM ||
1437 br_ip4_multicast_is_router(br) ||
1438 br_ip6_multicast_is_router(br))
1439 goto out;
1440
1441 br_mc_router_state_change(br, false);
1442 out:
1443 spin_unlock(&br->multicast_lock);
1444 }
1445
1446 static void br_ip4_multicast_local_router_expired(struct timer_list *t)
1447 {
1448 struct net_bridge *br = from_timer(br, t, ip4_mc_router_timer);
1449
1450 br_multicast_local_router_expired(br, t);
1451 }
1452
1453 #if IS_ENABLED(CONFIG_IPV6)
1454 static void br_ip6_multicast_local_router_expired(struct timer_list *t)
1455 {
1456 struct net_bridge *br = from_timer(br, t, ip6_mc_router_timer);
1457
1458 br_multicast_local_router_expired(br, t);
1459 }
1460 #endif
1461
1462 static void br_multicast_querier_expired(struct net_bridge *br,
1463 struct bridge_mcast_own_query *query)
1464 {
1465 spin_lock(&br->multicast_lock);
1466 if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
1467 goto out;
1468
1469 br_multicast_start_querier(br, query);
1470
1471 out:
1472 spin_unlock(&br->multicast_lock);
1473 }
1474
1475 static void br_ip4_multicast_querier_expired(struct timer_list *t)
1476 {
1477 struct net_bridge *br = from_timer(br, t, ip4_other_query.timer);
1478
1479 br_multicast_querier_expired(br, &br->ip4_own_query);
1480 }
1481
1482 #if IS_ENABLED(CONFIG_IPV6)
1483 static void br_ip6_multicast_querier_expired(struct timer_list *t)
1484 {
1485 struct net_bridge *br = from_timer(br, t, ip6_other_query.timer);
1486
1487 br_multicast_querier_expired(br, &br->ip6_own_query);
1488 }
1489 #endif
1490
1491 static void br_multicast_select_own_querier(struct net_bridge *br,
1492 struct br_ip *ip,
1493 struct sk_buff *skb)
1494 {
1495 if (ip->proto == htons(ETH_P_IP))
1496 br->ip4_querier.addr.src.ip4 = ip_hdr(skb)->saddr;
1497 #if IS_ENABLED(CONFIG_IPV6)
1498 else
1499 br->ip6_querier.addr.src.ip6 = ipv6_hdr(skb)->saddr;
1500 #endif
1501 }
1502
1503 static void __br_multicast_send_query(struct net_bridge *br,
1504 struct net_bridge_port *port,
1505 struct net_bridge_port_group *pg,
1506 struct br_ip *ip_dst,
1507 struct br_ip *group,
1508 bool with_srcs,
1509 u8 sflag,
1510 bool *need_rexmit)
1511 {
1512 bool over_lmqt = !!sflag;
1513 struct sk_buff *skb;
1514 u8 igmp_type;
1515
1516 again_under_lmqt:
1517 skb = br_multicast_alloc_query(br, pg, ip_dst, group, with_srcs,
1518 over_lmqt, sflag, &igmp_type,
1519 need_rexmit);
1520 if (!skb)
1521 return;
1522
1523 if (port) {
1524 skb->dev = port->dev;
1525 br_multicast_count(br, port, skb, igmp_type,
1526 BR_MCAST_DIR_TX);
1527 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
1528 dev_net(port->dev), NULL, skb, NULL, skb->dev,
1529 br_dev_queue_push_xmit);
1530
1531 if (over_lmqt && with_srcs && sflag) {
1532 over_lmqt = false;
1533 goto again_under_lmqt;
1534 }
1535 } else {
1536 br_multicast_select_own_querier(br, group, skb);
1537 br_multicast_count(br, port, skb, igmp_type,
1538 BR_MCAST_DIR_RX);
1539 netif_rx(skb);
1540 }
1541 }
1542
1543 static void br_multicast_send_query(struct net_bridge *br,
1544 struct net_bridge_port *port,
1545 struct bridge_mcast_own_query *own_query)
1546 {
1547 struct bridge_mcast_other_query *other_query = NULL;
1548 struct br_ip br_group;
1549 unsigned long time;
1550
1551 if (!netif_running(br->dev) ||
1552 !br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
1553 !br_opt_get(br, BROPT_MULTICAST_QUERIER))
1554 return;
1555
1556 memset(&br_group.dst, 0, sizeof(br_group.dst));
1557
1558 if (port ? (own_query == &port->ip4_own_query) :
1559 (own_query == &br->ip4_own_query)) {
1560 other_query = &br->ip4_other_query;
1561 br_group.proto = htons(ETH_P_IP);
1562 #if IS_ENABLED(CONFIG_IPV6)
1563 } else {
1564 other_query = &br->ip6_other_query;
1565 br_group.proto = htons(ETH_P_IPV6);
1566 #endif
1567 }
1568
1569 if (!other_query || timer_pending(&other_query->timer))
1570 return;
1571
1572 __br_multicast_send_query(br, port, NULL, NULL, &br_group, false, 0,
1573 NULL);
1574
1575 time = jiffies;
1576 time += own_query->startup_sent < br->multicast_startup_query_count ?
1577 br->multicast_startup_query_interval :
1578 br->multicast_query_interval;
1579 mod_timer(&own_query->timer, time);
1580 }
1581
1582 static void
1583 br_multicast_port_query_expired(struct net_bridge_port *port,
1584 struct bridge_mcast_own_query *query)
1585 {
1586 struct net_bridge *br = port->br;
1587
1588 spin_lock(&br->multicast_lock);
1589 if (port->state == BR_STATE_DISABLED ||
1590 port->state == BR_STATE_BLOCKING)
1591 goto out;
1592
1593 if (query->startup_sent < br->multicast_startup_query_count)
1594 query->startup_sent++;
1595
1596 br_multicast_send_query(port->br, port, query);
1597
1598 out:
1599 spin_unlock(&br->multicast_lock);
1600 }
1601
1602 static void br_ip4_multicast_port_query_expired(struct timer_list *t)
1603 {
1604 struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer);
1605
1606 br_multicast_port_query_expired(port, &port->ip4_own_query);
1607 }
1608
1609 #if IS_ENABLED(CONFIG_IPV6)
1610 static void br_ip6_multicast_port_query_expired(struct timer_list *t)
1611 {
1612 struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer);
1613
1614 br_multicast_port_query_expired(port, &port->ip6_own_query);
1615 }
1616 #endif
1617
1618 static void br_multicast_port_group_rexmit(struct timer_list *t)
1619 {
1620 struct net_bridge_port_group *pg = from_timer(pg, t, rexmit_timer);
1621 struct bridge_mcast_other_query *other_query = NULL;
1622 struct net_bridge *br = pg->key.port->br;
1623 bool need_rexmit = false;
1624
1625 spin_lock(&br->multicast_lock);
1626 if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) ||
1627 !br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
1628 !br_opt_get(br, BROPT_MULTICAST_QUERIER))
1629 goto out;
1630
1631 if (pg->key.addr.proto == htons(ETH_P_IP))
1632 other_query = &br->ip4_other_query;
1633 #if IS_ENABLED(CONFIG_IPV6)
1634 else
1635 other_query = &br->ip6_other_query;
1636 #endif
1637
1638 if (!other_query || timer_pending(&other_query->timer))
1639 goto out;
1640
1641 if (pg->grp_query_rexmit_cnt) {
1642 pg->grp_query_rexmit_cnt--;
1643 __br_multicast_send_query(br, pg->key.port, pg, &pg->key.addr,
1644 &pg->key.addr, false, 1, NULL);
1645 }
1646 __br_multicast_send_query(br, pg->key.port, pg, &pg->key.addr,
1647 &pg->key.addr, true, 0, &need_rexmit);
1648
1649 if (pg->grp_query_rexmit_cnt || need_rexmit)
1650 mod_timer(&pg->rexmit_timer, jiffies +
1651 br->multicast_last_member_interval);
1652 out:
1653 spin_unlock(&br->multicast_lock);
1654 }
1655
1656 static int br_mc_disabled_update(struct net_device *dev, bool value,
1657 struct netlink_ext_ack *extack)
1658 {
1659 struct switchdev_attr attr = {
1660 .orig_dev = dev,
1661 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
1662 .flags = SWITCHDEV_F_DEFER,
1663 .u.mc_disabled = !value,
1664 };
1665
1666 return switchdev_port_attr_set(dev, &attr, extack);
1667 }
1668
1669 int br_multicast_add_port(struct net_bridge_port *port)
1670 {
1671 int err;
1672
1673 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1674 port->multicast_eht_hosts_limit = BR_MCAST_DEFAULT_EHT_HOSTS_LIMIT;
1675
1676 timer_setup(&port->ip4_mc_router_timer,
1677 br_ip4_multicast_router_expired, 0);
1678 timer_setup(&port->ip4_own_query.timer,
1679 br_ip4_multicast_port_query_expired, 0);
1680 #if IS_ENABLED(CONFIG_IPV6)
1681 timer_setup(&port->ip6_mc_router_timer,
1682 br_ip6_multicast_router_expired, 0);
1683 timer_setup(&port->ip6_own_query.timer,
1684 br_ip6_multicast_port_query_expired, 0);
1685 #endif
1686 err = br_mc_disabled_update(port->dev,
1687 br_opt_get(port->br,
1688 BROPT_MULTICAST_ENABLED),
1689 NULL);
1690 if (err && err != -EOPNOTSUPP)
1691 return err;
1692
1693 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
1694 if (!port->mcast_stats)
1695 return -ENOMEM;
1696
1697 return 0;
1698 }
1699
1700 void br_multicast_del_port(struct net_bridge_port *port)
1701 {
1702 struct net_bridge *br = port->br;
1703 struct net_bridge_port_group *pg;
1704 HLIST_HEAD(deleted_head);
1705 struct hlist_node *n;
1706
1707 /* Take care of the remaining groups, only perm ones should be left */
1708 spin_lock_bh(&br->multicast_lock);
1709 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1710 br_multicast_find_del_pg(br, pg);
1711 hlist_move_list(&br->mcast_gc_list, &deleted_head);
1712 spin_unlock_bh(&br->multicast_lock);
1713 br_multicast_gc(&deleted_head);
1714 del_timer_sync(&port->ip4_mc_router_timer);
1715 #if IS_ENABLED(CONFIG_IPV6)
1716 del_timer_sync(&port->ip6_mc_router_timer);
1717 #endif
1718 free_percpu(port->mcast_stats);
1719 }
1720
1721 static void br_multicast_enable(struct bridge_mcast_own_query *query)
1722 {
1723 query->startup_sent = 0;
1724
1725 if (try_to_del_timer_sync(&query->timer) >= 0 ||
1726 del_timer(&query->timer))
1727 mod_timer(&query->timer, jiffies);
1728 }
1729
1730 static void __br_multicast_enable_port(struct net_bridge_port *port)
1731 {
1732 struct net_bridge *br = port->br;
1733
1734 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || !netif_running(br->dev))
1735 return;
1736
1737 br_multicast_enable(&port->ip4_own_query);
1738 #if IS_ENABLED(CONFIG_IPV6)
1739 br_multicast_enable(&port->ip6_own_query);
1740 #endif
1741 if (port->multicast_router == MDB_RTR_TYPE_PERM) {
1742 br_ip4_multicast_add_router(br, port);
1743 br_ip6_multicast_add_router(br, port);
1744 }
1745 }
1746
1747 void br_multicast_enable_port(struct net_bridge_port *port)
1748 {
1749 struct net_bridge *br = port->br;
1750
1751 spin_lock(&br->multicast_lock);
1752 __br_multicast_enable_port(port);
1753 spin_unlock(&br->multicast_lock);
1754 }
1755
1756 void br_multicast_disable_port(struct net_bridge_port *port)
1757 {
1758 struct net_bridge *br = port->br;
1759 struct net_bridge_port_group *pg;
1760 struct hlist_node *n;
1761 bool del = false;
1762
1763 spin_lock(&br->multicast_lock);
1764 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1765 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
1766 br_multicast_find_del_pg(br, pg);
1767
1768 del |= br_ip4_multicast_rport_del(port);
1769 del_timer(&port->ip4_mc_router_timer);
1770 del_timer(&port->ip4_own_query.timer);
1771 del |= br_ip6_multicast_rport_del(port);
1772 #if IS_ENABLED(CONFIG_IPV6)
1773 del_timer(&port->ip6_mc_router_timer);
1774 del_timer(&port->ip6_own_query.timer);
1775 #endif
1776 br_multicast_rport_del_notify(port, del);
1777 spin_unlock(&br->multicast_lock);
1778 }
1779
1780 static int __grp_src_delete_marked(struct net_bridge_port_group *pg)
1781 {
1782 struct net_bridge_group_src *ent;
1783 struct hlist_node *tmp;
1784 int deleted = 0;
1785
1786 hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node)
1787 if (ent->flags & BR_SGRP_F_DELETE) {
1788 br_multicast_del_group_src(ent, false);
1789 deleted++;
1790 }
1791
1792 return deleted;
1793 }
1794
1795 static void __grp_src_mod_timer(struct net_bridge_group_src *src,
1796 unsigned long expires)
1797 {
1798 mod_timer(&src->timer, expires);
1799 br_multicast_fwd_src_handle(src);
1800 }
1801
1802 static void __grp_src_query_marked_and_rexmit(struct net_bridge_port_group *pg)
1803 {
1804 struct bridge_mcast_other_query *other_query = NULL;
1805 struct net_bridge *br = pg->key.port->br;
1806 u32 lmqc = br->multicast_last_member_count;
1807 unsigned long lmqt, lmi, now = jiffies;
1808 struct net_bridge_group_src *ent;
1809
1810 if (!netif_running(br->dev) ||
1811 !br_opt_get(br, BROPT_MULTICAST_ENABLED))
1812 return;
1813
1814 if (pg->key.addr.proto == htons(ETH_P_IP))
1815 other_query = &br->ip4_other_query;
1816 #if IS_ENABLED(CONFIG_IPV6)
1817 else
1818 other_query = &br->ip6_other_query;
1819 #endif
1820
1821 lmqt = now + br_multicast_lmqt(br);
1822 hlist_for_each_entry(ent, &pg->src_list, node) {
1823 if (ent->flags & BR_SGRP_F_SEND) {
1824 ent->flags &= ~BR_SGRP_F_SEND;
1825 if (ent->timer.expires > lmqt) {
1826 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) &&
1827 other_query &&
1828 !timer_pending(&other_query->timer))
1829 ent->src_query_rexmit_cnt = lmqc;
1830 __grp_src_mod_timer(ent, lmqt);
1831 }
1832 }
1833 }
1834
1835 if (!br_opt_get(br, BROPT_MULTICAST_QUERIER) ||
1836 !other_query || timer_pending(&other_query->timer))
1837 return;
1838
1839 __br_multicast_send_query(br, pg->key.port, pg, &pg->key.addr,
1840 &pg->key.addr, true, 1, NULL);
1841
1842 lmi = now + br->multicast_last_member_interval;
1843 if (!timer_pending(&pg->rexmit_timer) ||
1844 time_after(pg->rexmit_timer.expires, lmi))
1845 mod_timer(&pg->rexmit_timer, lmi);
1846 }
1847
1848 static void __grp_send_query_and_rexmit(struct net_bridge_port_group *pg)
1849 {
1850 struct bridge_mcast_other_query *other_query = NULL;
1851 struct net_bridge *br = pg->key.port->br;
1852 unsigned long now = jiffies, lmi;
1853
1854 if (!netif_running(br->dev) ||
1855 !br_opt_get(br, BROPT_MULTICAST_ENABLED))
1856 return;
1857
1858 if (pg->key.addr.proto == htons(ETH_P_IP))
1859 other_query = &br->ip4_other_query;
1860 #if IS_ENABLED(CONFIG_IPV6)
1861 else
1862 other_query = &br->ip6_other_query;
1863 #endif
1864
1865 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) &&
1866 other_query && !timer_pending(&other_query->timer)) {
1867 lmi = now + br->multicast_last_member_interval;
1868 pg->grp_query_rexmit_cnt = br->multicast_last_member_count - 1;
1869 __br_multicast_send_query(br, pg->key.port, pg, &pg->key.addr,
1870 &pg->key.addr, false, 0, NULL);
1871 if (!timer_pending(&pg->rexmit_timer) ||
1872 time_after(pg->rexmit_timer.expires, lmi))
1873 mod_timer(&pg->rexmit_timer, lmi);
1874 }
1875
1876 if (pg->filter_mode == MCAST_EXCLUDE &&
1877 (!timer_pending(&pg->timer) ||
1878 time_after(pg->timer.expires, now + br_multicast_lmqt(br))))
1879 mod_timer(&pg->timer, now + br_multicast_lmqt(br));
1880 }
1881
1882 /* State Msg type New state Actions
1883 * INCLUDE (A) IS_IN (B) INCLUDE (A+B) (B)=GMI
1884 * INCLUDE (A) ALLOW (B) INCLUDE (A+B) (B)=GMI
1885 * EXCLUDE (X,Y) ALLOW (A) EXCLUDE (X+A,Y-A) (A)=GMI
1886 */
1887 static bool br_multicast_isinc_allow(struct net_bridge_port_group *pg, void *h_addr,
1888 void *srcs, u32 nsrcs, size_t addr_size,
1889 int grec_type)
1890 {
1891 struct net_bridge *br = pg->key.port->br;
1892 struct net_bridge_group_src *ent;
1893 unsigned long now = jiffies;
1894 bool changed = false;
1895 struct br_ip src_ip;
1896 u32 src_idx;
1897
1898 memset(&src_ip, 0, sizeof(src_ip));
1899 src_ip.proto = pg->key.addr.proto;
1900 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
1901 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
1902 ent = br_multicast_find_group_src(pg, &src_ip);
1903 if (!ent) {
1904 ent = br_multicast_new_group_src(pg, &src_ip);
1905 if (ent)
1906 changed = true;
1907 }
1908
1909 if (ent)
1910 __grp_src_mod_timer(ent, now + br_multicast_gmi(br));
1911 }
1912
1913 if (br_multicast_eht_handle(pg, h_addr, srcs, nsrcs, addr_size, grec_type))
1914 changed = true;
1915
1916 return changed;
1917 }
1918
1919 /* State Msg type New state Actions
1920 * INCLUDE (A) IS_EX (B) EXCLUDE (A*B,B-A) (B-A)=0
1921 * Delete (A-B)
1922 * Group Timer=GMI
1923 */
1924 static void __grp_src_isexc_incl(struct net_bridge_port_group *pg, void *h_addr,
1925 void *srcs, u32 nsrcs, size_t addr_size,
1926 int grec_type)
1927 {
1928 struct net_bridge_group_src *ent;
1929 struct br_ip src_ip;
1930 u32 src_idx;
1931
1932 hlist_for_each_entry(ent, &pg->src_list, node)
1933 ent->flags |= BR_SGRP_F_DELETE;
1934
1935 memset(&src_ip, 0, sizeof(src_ip));
1936 src_ip.proto = pg->key.addr.proto;
1937 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
1938 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
1939 ent = br_multicast_find_group_src(pg, &src_ip);
1940 if (ent)
1941 ent->flags &= ~BR_SGRP_F_DELETE;
1942 else
1943 ent = br_multicast_new_group_src(pg, &src_ip);
1944 if (ent)
1945 br_multicast_fwd_src_handle(ent);
1946 }
1947
1948 br_multicast_eht_handle(pg, h_addr, srcs, nsrcs, addr_size, grec_type);
1949
1950 __grp_src_delete_marked(pg);
1951 }
1952
1953 /* State Msg type New state Actions
1954 * EXCLUDE (X,Y) IS_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=GMI
1955 * Delete (X-A)
1956 * Delete (Y-A)
1957 * Group Timer=GMI
1958 */
1959 static bool __grp_src_isexc_excl(struct net_bridge_port_group *pg, void *h_addr,
1960 void *srcs, u32 nsrcs, size_t addr_size,
1961 int grec_type)
1962 {
1963 struct net_bridge *br = pg->key.port->br;
1964 struct net_bridge_group_src *ent;
1965 unsigned long now = jiffies;
1966 bool changed = false;
1967 struct br_ip src_ip;
1968 u32 src_idx;
1969
1970 hlist_for_each_entry(ent, &pg->src_list, node)
1971 ent->flags |= BR_SGRP_F_DELETE;
1972
1973 memset(&src_ip, 0, sizeof(src_ip));
1974 src_ip.proto = pg->key.addr.proto;
1975 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
1976 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
1977 ent = br_multicast_find_group_src(pg, &src_ip);
1978 if (ent) {
1979 ent->flags &= ~BR_SGRP_F_DELETE;
1980 } else {
1981 ent = br_multicast_new_group_src(pg, &src_ip);
1982 if (ent) {
1983 __grp_src_mod_timer(ent,
1984 now + br_multicast_gmi(br));
1985 changed = true;
1986 }
1987 }
1988 }
1989
1990 if (br_multicast_eht_handle(pg, h_addr, srcs, nsrcs, addr_size, grec_type))
1991 changed = true;
1992
1993 if (__grp_src_delete_marked(pg))
1994 changed = true;
1995
1996 return changed;
1997 }
1998
1999 static bool br_multicast_isexc(struct net_bridge_port_group *pg, void *h_addr,
2000 void *srcs, u32 nsrcs, size_t addr_size,
2001 int grec_type)
2002 {
2003 struct net_bridge *br = pg->key.port->br;
2004 bool changed = false;
2005
2006 switch (pg->filter_mode) {
2007 case MCAST_INCLUDE:
2008 __grp_src_isexc_incl(pg, h_addr, srcs, nsrcs, addr_size,
2009 grec_type);
2010 br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE);
2011 changed = true;
2012 break;
2013 case MCAST_EXCLUDE:
2014 changed = __grp_src_isexc_excl(pg, h_addr, srcs, nsrcs, addr_size,
2015 grec_type);
2016 break;
2017 }
2018
2019 pg->filter_mode = MCAST_EXCLUDE;
2020 mod_timer(&pg->timer, jiffies + br_multicast_gmi(br));
2021
2022 return changed;
2023 }
2024
2025 /* State Msg type New state Actions
2026 * INCLUDE (A) TO_IN (B) INCLUDE (A+B) (B)=GMI
2027 * Send Q(G,A-B)
2028 */
2029 static bool __grp_src_toin_incl(struct net_bridge_port_group *pg, void *h_addr,
2030 void *srcs, u32 nsrcs, size_t addr_size,
2031 int grec_type)
2032 {
2033 struct net_bridge *br = pg->key.port->br;
2034 u32 src_idx, to_send = pg->src_ents;
2035 struct net_bridge_group_src *ent;
2036 unsigned long now = jiffies;
2037 bool changed = false;
2038 struct br_ip src_ip;
2039
2040 hlist_for_each_entry(ent, &pg->src_list, node)
2041 ent->flags |= BR_SGRP_F_SEND;
2042
2043 memset(&src_ip, 0, sizeof(src_ip));
2044 src_ip.proto = pg->key.addr.proto;
2045 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2046 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2047 ent = br_multicast_find_group_src(pg, &src_ip);
2048 if (ent) {
2049 ent->flags &= ~BR_SGRP_F_SEND;
2050 to_send--;
2051 } else {
2052 ent = br_multicast_new_group_src(pg, &src_ip);
2053 if (ent)
2054 changed = true;
2055 }
2056 if (ent)
2057 __grp_src_mod_timer(ent, now + br_multicast_gmi(br));
2058 }
2059
2060 if (br_multicast_eht_handle(pg, h_addr, srcs, nsrcs, addr_size, grec_type))
2061 changed = true;
2062
2063 if (to_send)
2064 __grp_src_query_marked_and_rexmit(pg);
2065
2066 return changed;
2067 }
2068
2069 /* State Msg type New state Actions
2070 * EXCLUDE (X,Y) TO_IN (A) EXCLUDE (X+A,Y-A) (A)=GMI
2071 * Send Q(G,X-A)
2072 * Send Q(G)
2073 */
2074 static bool __grp_src_toin_excl(struct net_bridge_port_group *pg, void *h_addr,
2075 void *srcs, u32 nsrcs, size_t addr_size,
2076 int grec_type)
2077 {
2078 struct net_bridge *br = pg->key.port->br;
2079 u32 src_idx, to_send = pg->src_ents;
2080 struct net_bridge_group_src *ent;
2081 unsigned long now = jiffies;
2082 bool changed = false;
2083 struct br_ip src_ip;
2084
2085 hlist_for_each_entry(ent, &pg->src_list, node)
2086 if (timer_pending(&ent->timer))
2087 ent->flags |= BR_SGRP_F_SEND;
2088
2089 memset(&src_ip, 0, sizeof(src_ip));
2090 src_ip.proto = pg->key.addr.proto;
2091 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2092 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2093 ent = br_multicast_find_group_src(pg, &src_ip);
2094 if (ent) {
2095 if (timer_pending(&ent->timer)) {
2096 ent->flags &= ~BR_SGRP_F_SEND;
2097 to_send--;
2098 }
2099 } else {
2100 ent = br_multicast_new_group_src(pg, &src_ip);
2101 if (ent)
2102 changed = true;
2103 }
2104 if (ent)
2105 __grp_src_mod_timer(ent, now + br_multicast_gmi(br));
2106 }
2107
2108 if (br_multicast_eht_handle(pg, h_addr, srcs, nsrcs, addr_size, grec_type))
2109 changed = true;
2110
2111 if (to_send)
2112 __grp_src_query_marked_and_rexmit(pg);
2113
2114 __grp_send_query_and_rexmit(pg);
2115
2116 return changed;
2117 }
2118
2119 static bool br_multicast_toin(struct net_bridge_port_group *pg, void *h_addr,
2120 void *srcs, u32 nsrcs, size_t addr_size,
2121 int grec_type)
2122 {
2123 bool changed = false;
2124
2125 switch (pg->filter_mode) {
2126 case MCAST_INCLUDE:
2127 changed = __grp_src_toin_incl(pg, h_addr, srcs, nsrcs, addr_size,
2128 grec_type);
2129 break;
2130 case MCAST_EXCLUDE:
2131 changed = __grp_src_toin_excl(pg, h_addr, srcs, nsrcs, addr_size,
2132 grec_type);
2133 break;
2134 }
2135
2136 if (br_multicast_eht_should_del_pg(pg)) {
2137 pg->flags |= MDB_PG_FLAGS_FAST_LEAVE;
2138 br_multicast_find_del_pg(pg->key.port->br, pg);
2139 /* a notification has already been sent and we shouldn't
2140 * access pg after the delete so we have to return false
2141 */
2142 changed = false;
2143 }
2144
2145 return changed;
2146 }
2147
2148 /* State Msg type New state Actions
2149 * INCLUDE (A) TO_EX (B) EXCLUDE (A*B,B-A) (B-A)=0
2150 * Delete (A-B)
2151 * Send Q(G,A*B)
2152 * Group Timer=GMI
2153 */
2154 static void __grp_src_toex_incl(struct net_bridge_port_group *pg, void *h_addr,
2155 void *srcs, u32 nsrcs, size_t addr_size,
2156 int grec_type)
2157 {
2158 struct net_bridge_group_src *ent;
2159 u32 src_idx, to_send = 0;
2160 struct br_ip src_ip;
2161
2162 hlist_for_each_entry(ent, &pg->src_list, node)
2163 ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE;
2164
2165 memset(&src_ip, 0, sizeof(src_ip));
2166 src_ip.proto = pg->key.addr.proto;
2167 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2168 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2169 ent = br_multicast_find_group_src(pg, &src_ip);
2170 if (ent) {
2171 ent->flags = (ent->flags & ~BR_SGRP_F_DELETE) |
2172 BR_SGRP_F_SEND;
2173 to_send++;
2174 } else {
2175 ent = br_multicast_new_group_src(pg, &src_ip);
2176 }
2177 if (ent)
2178 br_multicast_fwd_src_handle(ent);
2179 }
2180
2181 br_multicast_eht_handle(pg, h_addr, srcs, nsrcs, addr_size, grec_type);
2182
2183 __grp_src_delete_marked(pg);
2184 if (to_send)
2185 __grp_src_query_marked_and_rexmit(pg);
2186 }
2187
2188 /* State Msg type New state Actions
2189 * EXCLUDE (X,Y) TO_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=Group Timer
2190 * Delete (X-A)
2191 * Delete (Y-A)
2192 * Send Q(G,A-Y)
2193 * Group Timer=GMI
2194 */
2195 static bool __grp_src_toex_excl(struct net_bridge_port_group *pg, void *h_addr,
2196 void *srcs, u32 nsrcs, size_t addr_size,
2197 int grec_type)
2198 {
2199 struct net_bridge_group_src *ent;
2200 u32 src_idx, to_send = 0;
2201 bool changed = false;
2202 struct br_ip src_ip;
2203
2204 hlist_for_each_entry(ent, &pg->src_list, node)
2205 ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE;
2206
2207 memset(&src_ip, 0, sizeof(src_ip));
2208 src_ip.proto = pg->key.addr.proto;
2209 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2210 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2211 ent = br_multicast_find_group_src(pg, &src_ip);
2212 if (ent) {
2213 ent->flags &= ~BR_SGRP_F_DELETE;
2214 } else {
2215 ent = br_multicast_new_group_src(pg, &src_ip);
2216 if (ent) {
2217 __grp_src_mod_timer(ent, pg->timer.expires);
2218 changed = true;
2219 }
2220 }
2221 if (ent && timer_pending(&ent->timer)) {
2222 ent->flags |= BR_SGRP_F_SEND;
2223 to_send++;
2224 }
2225 }
2226
2227 if (br_multicast_eht_handle(pg, h_addr, srcs, nsrcs, addr_size, grec_type))
2228 changed = true;
2229
2230 if (__grp_src_delete_marked(pg))
2231 changed = true;
2232 if (to_send)
2233 __grp_src_query_marked_and_rexmit(pg);
2234
2235 return changed;
2236 }
2237
2238 static bool br_multicast_toex(struct net_bridge_port_group *pg, void *h_addr,
2239 void *srcs, u32 nsrcs, size_t addr_size,
2240 int grec_type)
2241 {
2242 struct net_bridge *br = pg->key.port->br;
2243 bool changed = false;
2244
2245 switch (pg->filter_mode) {
2246 case MCAST_INCLUDE:
2247 __grp_src_toex_incl(pg, h_addr, srcs, nsrcs, addr_size,
2248 grec_type);
2249 br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE);
2250 changed = true;
2251 break;
2252 case MCAST_EXCLUDE:
2253 changed = __grp_src_toex_excl(pg, h_addr, srcs, nsrcs, addr_size,
2254 grec_type);
2255 break;
2256 }
2257
2258 pg->filter_mode = MCAST_EXCLUDE;
2259 mod_timer(&pg->timer, jiffies + br_multicast_gmi(br));
2260
2261 return changed;
2262 }
2263
2264 /* State Msg type New state Actions
2265 * INCLUDE (A) BLOCK (B) INCLUDE (A) Send Q(G,A*B)
2266 */
2267 static bool __grp_src_block_incl(struct net_bridge_port_group *pg, void *h_addr,
2268 void *srcs, u32 nsrcs, size_t addr_size, int grec_type)
2269 {
2270 struct net_bridge_group_src *ent;
2271 u32 src_idx, to_send = 0;
2272 bool changed = false;
2273 struct br_ip src_ip;
2274
2275 hlist_for_each_entry(ent, &pg->src_list, node)
2276 ent->flags &= ~BR_SGRP_F_SEND;
2277
2278 memset(&src_ip, 0, sizeof(src_ip));
2279 src_ip.proto = pg->key.addr.proto;
2280 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2281 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2282 ent = br_multicast_find_group_src(pg, &src_ip);
2283 if (ent) {
2284 ent->flags |= BR_SGRP_F_SEND;
2285 to_send++;
2286 }
2287 }
2288
2289 if (br_multicast_eht_handle(pg, h_addr, srcs, nsrcs, addr_size, grec_type))
2290 changed = true;
2291
2292 if (to_send)
2293 __grp_src_query_marked_and_rexmit(pg);
2294
2295 return changed;
2296 }
2297
2298 /* State Msg type New state Actions
2299 * EXCLUDE (X,Y) BLOCK (A) EXCLUDE (X+(A-Y),Y) (A-X-Y)=Group Timer
2300 * Send Q(G,A-Y)
2301 */
2302 static bool __grp_src_block_excl(struct net_bridge_port_group *pg, void *h_addr,
2303 void *srcs, u32 nsrcs, size_t addr_size, int grec_type)
2304 {
2305 struct net_bridge_group_src *ent;
2306 u32 src_idx, to_send = 0;
2307 bool changed = false;
2308 struct br_ip src_ip;
2309
2310 hlist_for_each_entry(ent, &pg->src_list, node)
2311 ent->flags &= ~BR_SGRP_F_SEND;
2312
2313 memset(&src_ip, 0, sizeof(src_ip));
2314 src_ip.proto = pg->key.addr.proto;
2315 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2316 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2317 ent = br_multicast_find_group_src(pg, &src_ip);
2318 if (!ent) {
2319 ent = br_multicast_new_group_src(pg, &src_ip);
2320 if (ent) {
2321 __grp_src_mod_timer(ent, pg->timer.expires);
2322 changed = true;
2323 }
2324 }
2325 if (ent && timer_pending(&ent->timer)) {
2326 ent->flags |= BR_SGRP_F_SEND;
2327 to_send++;
2328 }
2329 }
2330
2331 if (br_multicast_eht_handle(pg, h_addr, srcs, nsrcs, addr_size, grec_type))
2332 changed = true;
2333
2334 if (to_send)
2335 __grp_src_query_marked_and_rexmit(pg);
2336
2337 return changed;
2338 }
2339
2340 static bool br_multicast_block(struct net_bridge_port_group *pg, void *h_addr,
2341 void *srcs, u32 nsrcs, size_t addr_size, int grec_type)
2342 {
2343 bool changed = false;
2344
2345 switch (pg->filter_mode) {
2346 case MCAST_INCLUDE:
2347 changed = __grp_src_block_incl(pg, h_addr, srcs, nsrcs, addr_size,
2348 grec_type);
2349 break;
2350 case MCAST_EXCLUDE:
2351 changed = __grp_src_block_excl(pg, h_addr, srcs, nsrcs, addr_size,
2352 grec_type);
2353 break;
2354 }
2355
2356 if ((pg->filter_mode == MCAST_INCLUDE && hlist_empty(&pg->src_list)) ||
2357 br_multicast_eht_should_del_pg(pg)) {
2358 if (br_multicast_eht_should_del_pg(pg))
2359 pg->flags |= MDB_PG_FLAGS_FAST_LEAVE;
2360 br_multicast_find_del_pg(pg->key.port->br, pg);
2361 /* a notification has already been sent and we shouldn't
2362 * access pg after the delete so we have to return false
2363 */
2364 changed = false;
2365 }
2366
2367 return changed;
2368 }
2369
2370 static struct net_bridge_port_group *
2371 br_multicast_find_port(struct net_bridge_mdb_entry *mp,
2372 struct net_bridge_port *p,
2373 const unsigned char *src)
2374 {
2375 struct net_bridge *br __maybe_unused = mp->br;
2376 struct net_bridge_port_group *pg;
2377
2378 for (pg = mlock_dereference(mp->ports, br);
2379 pg;
2380 pg = mlock_dereference(pg->next, br))
2381 if (br_port_group_equal(pg, p, src))
2382 return pg;
2383
2384 return NULL;
2385 }
2386
2387 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
2388 struct net_bridge_port *port,
2389 struct sk_buff *skb,
2390 u16 vid)
2391 {
2392 bool igmpv2 = br->multicast_igmp_version == 2;
2393 struct net_bridge_mdb_entry *mdst;
2394 struct net_bridge_port_group *pg;
2395 const unsigned char *src;
2396 struct igmpv3_report *ih;
2397 struct igmpv3_grec *grec;
2398 int i, len, num, type;
2399 __be32 group, *h_addr;
2400 bool changed = false;
2401 int err = 0;
2402 u16 nsrcs;
2403
2404 ih = igmpv3_report_hdr(skb);
2405 num = ntohs(ih->ngrec);
2406 len = skb_transport_offset(skb) + sizeof(*ih);
2407
2408 for (i = 0; i < num; i++) {
2409 len += sizeof(*grec);
2410 if (!ip_mc_may_pull(skb, len))
2411 return -EINVAL;
2412
2413 grec = (void *)(skb->data + len - sizeof(*grec));
2414 group = grec->grec_mca;
2415 type = grec->grec_type;
2416 nsrcs = ntohs(grec->grec_nsrcs);
2417
2418 len += nsrcs * 4;
2419 if (!ip_mc_may_pull(skb, len))
2420 return -EINVAL;
2421
2422 switch (type) {
2423 case IGMPV3_MODE_IS_INCLUDE:
2424 case IGMPV3_MODE_IS_EXCLUDE:
2425 case IGMPV3_CHANGE_TO_INCLUDE:
2426 case IGMPV3_CHANGE_TO_EXCLUDE:
2427 case IGMPV3_ALLOW_NEW_SOURCES:
2428 case IGMPV3_BLOCK_OLD_SOURCES:
2429 break;
2430
2431 default:
2432 continue;
2433 }
2434
2435 src = eth_hdr(skb)->h_source;
2436 if (nsrcs == 0 &&
2437 (type == IGMPV3_CHANGE_TO_INCLUDE ||
2438 type == IGMPV3_MODE_IS_INCLUDE)) {
2439 if (!port || igmpv2) {
2440 br_ip4_multicast_leave_group(br, port, group, vid, src);
2441 continue;
2442 }
2443 } else {
2444 err = br_ip4_multicast_add_group(br, port, group, vid,
2445 src, igmpv2);
2446 if (err)
2447 break;
2448 }
2449
2450 if (!port || igmpv2)
2451 continue;
2452
2453 spin_lock_bh(&br->multicast_lock);
2454 mdst = br_mdb_ip4_get(br, group, vid);
2455 if (!mdst)
2456 goto unlock_continue;
2457 pg = br_multicast_find_port(mdst, port, src);
2458 if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT))
2459 goto unlock_continue;
2460 /* reload grec and host addr */
2461 grec = (void *)(skb->data + len - sizeof(*grec) - (nsrcs * 4));
2462 h_addr = &ip_hdr(skb)->saddr;
2463 switch (type) {
2464 case IGMPV3_ALLOW_NEW_SOURCES:
2465 changed = br_multicast_isinc_allow(pg, h_addr, grec->grec_src,
2466 nsrcs, sizeof(__be32), type);
2467 break;
2468 case IGMPV3_MODE_IS_INCLUDE:
2469 changed = br_multicast_isinc_allow(pg, h_addr, grec->grec_src,
2470 nsrcs, sizeof(__be32), type);
2471 break;
2472 case IGMPV3_MODE_IS_EXCLUDE:
2473 changed = br_multicast_isexc(pg, h_addr, grec->grec_src,
2474 nsrcs, sizeof(__be32), type);
2475 break;
2476 case IGMPV3_CHANGE_TO_INCLUDE:
2477 changed = br_multicast_toin(pg, h_addr, grec->grec_src,
2478 nsrcs, sizeof(__be32), type);
2479 break;
2480 case IGMPV3_CHANGE_TO_EXCLUDE:
2481 changed = br_multicast_toex(pg, h_addr, grec->grec_src,
2482 nsrcs, sizeof(__be32), type);
2483 break;
2484 case IGMPV3_BLOCK_OLD_SOURCES:
2485 changed = br_multicast_block(pg, h_addr, grec->grec_src,
2486 nsrcs, sizeof(__be32), type);
2487 break;
2488 }
2489 if (changed)
2490 br_mdb_notify(br->dev, mdst, pg, RTM_NEWMDB);
2491 unlock_continue:
2492 spin_unlock_bh(&br->multicast_lock);
2493 }
2494
2495 return err;
2496 }
2497
2498 #if IS_ENABLED(CONFIG_IPV6)
2499 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
2500 struct net_bridge_port *port,
2501 struct sk_buff *skb,
2502 u16 vid)
2503 {
2504 bool mldv1 = br->multicast_mld_version == 1;
2505 struct net_bridge_mdb_entry *mdst;
2506 struct net_bridge_port_group *pg;
2507 unsigned int nsrcs_offset;
2508 const unsigned char *src;
2509 struct icmp6hdr *icmp6h;
2510 struct in6_addr *h_addr;
2511 struct mld2_grec *grec;
2512 unsigned int grec_len;
2513 bool changed = false;
2514 int i, len, num;
2515 int err = 0;
2516
2517 if (!ipv6_mc_may_pull(skb, sizeof(*icmp6h)))
2518 return -EINVAL;
2519
2520 icmp6h = icmp6_hdr(skb);
2521 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
2522 len = skb_transport_offset(skb) + sizeof(*icmp6h);
2523
2524 for (i = 0; i < num; i++) {
2525 __be16 *_nsrcs, __nsrcs;
2526 u16 nsrcs;
2527
2528 nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs);
2529
2530 if (skb_transport_offset(skb) + ipv6_transport_len(skb) <
2531 nsrcs_offset + sizeof(__nsrcs))
2532 return -EINVAL;
2533
2534 _nsrcs = skb_header_pointer(skb, nsrcs_offset,
2535 sizeof(__nsrcs), &__nsrcs);
2536 if (!_nsrcs)
2537 return -EINVAL;
2538
2539 nsrcs = ntohs(*_nsrcs);
2540 grec_len = struct_size(grec, grec_src, nsrcs);
2541
2542 if (!ipv6_mc_may_pull(skb, len + grec_len))
2543 return -EINVAL;
2544
2545 grec = (struct mld2_grec *)(skb->data + len);
2546 len += grec_len;
2547
2548 switch (grec->grec_type) {
2549 case MLD2_MODE_IS_INCLUDE:
2550 case MLD2_MODE_IS_EXCLUDE:
2551 case MLD2_CHANGE_TO_INCLUDE:
2552 case MLD2_CHANGE_TO_EXCLUDE:
2553 case MLD2_ALLOW_NEW_SOURCES:
2554 case MLD2_BLOCK_OLD_SOURCES:
2555 break;
2556
2557 default:
2558 continue;
2559 }
2560
2561 src = eth_hdr(skb)->h_source;
2562 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
2563 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
2564 nsrcs == 0) {
2565 if (!port || mldv1) {
2566 br_ip6_multicast_leave_group(br, port,
2567 &grec->grec_mca,
2568 vid, src);
2569 continue;
2570 }
2571 } else {
2572 err = br_ip6_multicast_add_group(br, port,
2573 &grec->grec_mca, vid,
2574 src, mldv1);
2575 if (err)
2576 break;
2577 }
2578
2579 if (!port || mldv1)
2580 continue;
2581
2582 spin_lock_bh(&br->multicast_lock);
2583 mdst = br_mdb_ip6_get(br, &grec->grec_mca, vid);
2584 if (!mdst)
2585 goto unlock_continue;
2586 pg = br_multicast_find_port(mdst, port, src);
2587 if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT))
2588 goto unlock_continue;
2589 h_addr = &ipv6_hdr(skb)->saddr;
2590 switch (grec->grec_type) {
2591 case MLD2_ALLOW_NEW_SOURCES:
2592 changed = br_multicast_isinc_allow(pg, h_addr,
2593 grec->grec_src, nsrcs,
2594 sizeof(struct in6_addr),
2595 grec->grec_type);
2596 break;
2597 case MLD2_MODE_IS_INCLUDE:
2598 changed = br_multicast_isinc_allow(pg, h_addr,
2599 grec->grec_src, nsrcs,
2600 sizeof(struct in6_addr),
2601 grec->grec_type);
2602 break;
2603 case MLD2_MODE_IS_EXCLUDE:
2604 changed = br_multicast_isexc(pg, h_addr,
2605 grec->grec_src, nsrcs,
2606 sizeof(struct in6_addr),
2607 grec->grec_type);
2608 break;
2609 case MLD2_CHANGE_TO_INCLUDE:
2610 changed = br_multicast_toin(pg, h_addr,
2611 grec->grec_src, nsrcs,
2612 sizeof(struct in6_addr),
2613 grec->grec_type);
2614 break;
2615 case MLD2_CHANGE_TO_EXCLUDE:
2616 changed = br_multicast_toex(pg, h_addr,
2617 grec->grec_src, nsrcs,
2618 sizeof(struct in6_addr),
2619 grec->grec_type);
2620 break;
2621 case MLD2_BLOCK_OLD_SOURCES:
2622 changed = br_multicast_block(pg, h_addr,
2623 grec->grec_src, nsrcs,
2624 sizeof(struct in6_addr),
2625 grec->grec_type);
2626 break;
2627 }
2628 if (changed)
2629 br_mdb_notify(br->dev, mdst, pg, RTM_NEWMDB);
2630 unlock_continue:
2631 spin_unlock_bh(&br->multicast_lock);
2632 }
2633
2634 return err;
2635 }
2636 #endif
2637
2638 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
2639 struct net_bridge_port *port,
2640 __be32 saddr)
2641 {
2642 if (!timer_pending(&br->ip4_own_query.timer) &&
2643 !timer_pending(&br->ip4_other_query.timer))
2644 goto update;
2645
2646 if (!br->ip4_querier.addr.src.ip4)
2647 goto update;
2648
2649 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.src.ip4))
2650 goto update;
2651
2652 return false;
2653
2654 update:
2655 br->ip4_querier.addr.src.ip4 = saddr;
2656
2657 /* update protected by general multicast_lock by caller */
2658 rcu_assign_pointer(br->ip4_querier.port, port);
2659
2660 return true;
2661 }
2662
2663 #if IS_ENABLED(CONFIG_IPV6)
2664 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
2665 struct net_bridge_port *port,
2666 struct in6_addr *saddr)
2667 {
2668 if (!timer_pending(&br->ip6_own_query.timer) &&
2669 !timer_pending(&br->ip6_other_query.timer))
2670 goto update;
2671
2672 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.src.ip6) <= 0)
2673 goto update;
2674
2675 return false;
2676
2677 update:
2678 br->ip6_querier.addr.src.ip6 = *saddr;
2679
2680 /* update protected by general multicast_lock by caller */
2681 rcu_assign_pointer(br->ip6_querier.port, port);
2682
2683 return true;
2684 }
2685 #endif
2686
2687 static void
2688 br_multicast_update_query_timer(struct net_bridge *br,
2689 struct bridge_mcast_other_query *query,
2690 unsigned long max_delay)
2691 {
2692 if (!timer_pending(&query->timer))
2693 query->delay_time = jiffies + max_delay;
2694
2695 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
2696 }
2697
2698 static void br_port_mc_router_state_change(struct net_bridge_port *p,
2699 bool is_mc_router)
2700 {
2701 struct switchdev_attr attr = {
2702 .orig_dev = p->dev,
2703 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
2704 .flags = SWITCHDEV_F_DEFER,
2705 .u.mrouter = is_mc_router,
2706 };
2707
2708 switchdev_port_attr_set(p->dev, &attr, NULL);
2709 }
2710
2711 static struct net_bridge_port *
2712 br_multicast_rport_from_node(struct net_bridge *br,
2713 struct hlist_head *mc_router_list,
2714 struct hlist_node *rlist)
2715 {
2716 #if IS_ENABLED(CONFIG_IPV6)
2717 if (mc_router_list == &br->ip6_mc_router_list)
2718 return hlist_entry(rlist, struct net_bridge_port, ip6_rlist);
2719 #endif
2720 return hlist_entry(rlist, struct net_bridge_port, ip4_rlist);
2721 }
2722
2723 static struct hlist_node *
2724 br_multicast_get_rport_slot(struct net_bridge *br,
2725 struct net_bridge_port *port,
2726 struct hlist_head *mc_router_list)
2727
2728 {
2729 struct hlist_node *slot = NULL;
2730 struct net_bridge_port *p;
2731 struct hlist_node *rlist;
2732
2733 hlist_for_each(rlist, mc_router_list) {
2734 p = br_multicast_rport_from_node(br, mc_router_list, rlist);
2735
2736 if ((unsigned long)port >= (unsigned long)p)
2737 break;
2738
2739 slot = rlist;
2740 }
2741
2742 return slot;
2743 }
2744
2745 static bool br_multicast_no_router_otherpf(struct net_bridge_port *port,
2746 struct hlist_node *rnode)
2747 {
2748 #if IS_ENABLED(CONFIG_IPV6)
2749 if (rnode != &port->ip6_rlist)
2750 return hlist_unhashed(&port->ip6_rlist);
2751 else
2752 return hlist_unhashed(&port->ip4_rlist);
2753 #else
2754 return true;
2755 #endif
2756 }
2757
2758 /* Add port to router_list
2759 * list is maintained ordered by pointer value
2760 * and locked by br->multicast_lock and RCU
2761 */
2762 static void br_multicast_add_router(struct net_bridge *br,
2763 struct net_bridge_port *port,
2764 struct hlist_node *rlist,
2765 struct hlist_head *mc_router_list)
2766 {
2767 struct hlist_node *slot;
2768
2769 if (!hlist_unhashed(rlist))
2770 return;
2771
2772 slot = br_multicast_get_rport_slot(br, port, mc_router_list);
2773
2774 if (slot)
2775 hlist_add_behind_rcu(rlist, slot);
2776 else
2777 hlist_add_head_rcu(rlist, mc_router_list);
2778
2779 /* For backwards compatibility for now, only notify if we
2780 * switched from no IPv4/IPv6 multicast router to a new
2781 * IPv4 or IPv6 multicast router.
2782 */
2783 if (br_multicast_no_router_otherpf(port, rlist)) {
2784 br_rtr_notify(br->dev, port, RTM_NEWMDB);
2785 br_port_mc_router_state_change(port, true);
2786 }
2787 }
2788
2789 /* Add port to router_list
2790 * list is maintained ordered by pointer value
2791 * and locked by br->multicast_lock and RCU
2792 */
2793 static void br_ip4_multicast_add_router(struct net_bridge *br,
2794 struct net_bridge_port *port)
2795 {
2796 br_multicast_add_router(br, port, &port->ip4_rlist,
2797 &br->ip4_mc_router_list);
2798 }
2799
2800 /* Add port to router_list
2801 * list is maintained ordered by pointer value
2802 * and locked by br->multicast_lock and RCU
2803 */
2804 static void br_ip6_multicast_add_router(struct net_bridge *br,
2805 struct net_bridge_port *port)
2806 {
2807 #if IS_ENABLED(CONFIG_IPV6)
2808 br_multicast_add_router(br, port, &port->ip6_rlist,
2809 &br->ip6_mc_router_list);
2810 #endif
2811 }
2812
2813 static void br_multicast_mark_router(struct net_bridge *br,
2814 struct net_bridge_port *port,
2815 struct timer_list *timer,
2816 struct hlist_node *rlist,
2817 struct hlist_head *mc_router_list)
2818 {
2819 unsigned long now = jiffies;
2820
2821 if (!port) {
2822 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
2823 if (!br_ip4_multicast_is_router(br) &&
2824 !br_ip6_multicast_is_router(br))
2825 br_mc_router_state_change(br, true);
2826 mod_timer(timer, now + br->multicast_querier_interval);
2827 }
2828 return;
2829 }
2830
2831 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
2832 port->multicast_router == MDB_RTR_TYPE_PERM)
2833 return;
2834
2835 br_multicast_add_router(br, port, rlist, mc_router_list);
2836 mod_timer(timer, now + br->multicast_querier_interval);
2837 }
2838
2839 static void br_ip4_multicast_mark_router(struct net_bridge *br,
2840 struct net_bridge_port *port)
2841 {
2842 struct timer_list *timer = &br->ip4_mc_router_timer;
2843 struct hlist_node *rlist = NULL;
2844
2845 if (port) {
2846 timer = &port->ip4_mc_router_timer;
2847 rlist = &port->ip4_rlist;
2848 }
2849
2850 br_multicast_mark_router(br, port, timer, rlist,
2851 &br->ip4_mc_router_list);
2852 }
2853
2854 static void br_ip6_multicast_mark_router(struct net_bridge *br,
2855 struct net_bridge_port *port)
2856 {
2857 #if IS_ENABLED(CONFIG_IPV6)
2858 struct timer_list *timer = &br->ip6_mc_router_timer;
2859 struct hlist_node *rlist = NULL;
2860
2861 if (port) {
2862 timer = &port->ip6_mc_router_timer;
2863 rlist = &port->ip6_rlist;
2864 }
2865
2866 br_multicast_mark_router(br, port, timer, rlist,
2867 &br->ip6_mc_router_list);
2868 #endif
2869 }
2870
2871 static void
2872 br_ip4_multicast_query_received(struct net_bridge *br,
2873 struct net_bridge_port *port,
2874 struct bridge_mcast_other_query *query,
2875 struct br_ip *saddr,
2876 unsigned long max_delay)
2877 {
2878 if (!br_ip4_multicast_select_querier(br, port, saddr->src.ip4))
2879 return;
2880
2881 br_multicast_update_query_timer(br, query, max_delay);
2882 br_ip4_multicast_mark_router(br, port);
2883 }
2884
2885 #if IS_ENABLED(CONFIG_IPV6)
2886 static void
2887 br_ip6_multicast_query_received(struct net_bridge *br,
2888 struct net_bridge_port *port,
2889 struct bridge_mcast_other_query *query,
2890 struct br_ip *saddr,
2891 unsigned long max_delay)
2892 {
2893 if (!br_ip6_multicast_select_querier(br, port, &saddr->src.ip6))
2894 return;
2895
2896 br_multicast_update_query_timer(br, query, max_delay);
2897 br_ip6_multicast_mark_router(br, port);
2898 }
2899 #endif
2900
2901 static void br_ip4_multicast_query(struct net_bridge *br,
2902 struct net_bridge_port *port,
2903 struct sk_buff *skb,
2904 u16 vid)
2905 {
2906 unsigned int transport_len = ip_transport_len(skb);
2907 const struct iphdr *iph = ip_hdr(skb);
2908 struct igmphdr *ih = igmp_hdr(skb);
2909 struct net_bridge_mdb_entry *mp;
2910 struct igmpv3_query *ih3;
2911 struct net_bridge_port_group *p;
2912 struct net_bridge_port_group __rcu **pp;
2913 struct br_ip saddr;
2914 unsigned long max_delay;
2915 unsigned long now = jiffies;
2916 __be32 group;
2917
2918 spin_lock(&br->multicast_lock);
2919 if (!netif_running(br->dev) ||
2920 (port && port->state == BR_STATE_DISABLED))
2921 goto out;
2922
2923 group = ih->group;
2924
2925 if (transport_len == sizeof(*ih)) {
2926 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
2927
2928 if (!max_delay) {
2929 max_delay = 10 * HZ;
2930 group = 0;
2931 }
2932 } else if (transport_len >= sizeof(*ih3)) {
2933 ih3 = igmpv3_query_hdr(skb);
2934 if (ih3->nsrcs ||
2935 (br->multicast_igmp_version == 3 && group && ih3->suppress))
2936 goto out;
2937
2938 max_delay = ih3->code ?
2939 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
2940 } else {
2941 goto out;
2942 }
2943
2944 if (!group) {
2945 saddr.proto = htons(ETH_P_IP);
2946 saddr.src.ip4 = iph->saddr;
2947
2948 br_ip4_multicast_query_received(br, port, &br->ip4_other_query,
2949 &saddr, max_delay);
2950 goto out;
2951 }
2952
2953 mp = br_mdb_ip4_get(br, group, vid);
2954 if (!mp)
2955 goto out;
2956
2957 max_delay *= br->multicast_last_member_count;
2958
2959 if (mp->host_joined &&
2960 (timer_pending(&mp->timer) ?
2961 time_after(mp->timer.expires, now + max_delay) :
2962 try_to_del_timer_sync(&mp->timer) >= 0))
2963 mod_timer(&mp->timer, now + max_delay);
2964
2965 for (pp = &mp->ports;
2966 (p = mlock_dereference(*pp, br)) != NULL;
2967 pp = &p->next) {
2968 if (timer_pending(&p->timer) ?
2969 time_after(p->timer.expires, now + max_delay) :
2970 try_to_del_timer_sync(&p->timer) >= 0 &&
2971 (br->multicast_igmp_version == 2 ||
2972 p->filter_mode == MCAST_EXCLUDE))
2973 mod_timer(&p->timer, now + max_delay);
2974 }
2975
2976 out:
2977 spin_unlock(&br->multicast_lock);
2978 }
2979
2980 #if IS_ENABLED(CONFIG_IPV6)
2981 static int br_ip6_multicast_query(struct net_bridge *br,
2982 struct net_bridge_port *port,
2983 struct sk_buff *skb,
2984 u16 vid)
2985 {
2986 unsigned int transport_len = ipv6_transport_len(skb);
2987 struct mld_msg *mld;
2988 struct net_bridge_mdb_entry *mp;
2989 struct mld2_query *mld2q;
2990 struct net_bridge_port_group *p;
2991 struct net_bridge_port_group __rcu **pp;
2992 struct br_ip saddr;
2993 unsigned long max_delay;
2994 unsigned long now = jiffies;
2995 unsigned int offset = skb_transport_offset(skb);
2996 const struct in6_addr *group = NULL;
2997 bool is_general_query;
2998 int err = 0;
2999
3000 spin_lock(&br->multicast_lock);
3001 if (!netif_running(br->dev) ||
3002 (port && port->state == BR_STATE_DISABLED))
3003 goto out;
3004
3005 if (transport_len == sizeof(*mld)) {
3006 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
3007 err = -EINVAL;
3008 goto out;
3009 }
3010 mld = (struct mld_msg *) icmp6_hdr(skb);
3011 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
3012 if (max_delay)
3013 group = &mld->mld_mca;
3014 } else {
3015 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
3016 err = -EINVAL;
3017 goto out;
3018 }
3019 mld2q = (struct mld2_query *)icmp6_hdr(skb);
3020 if (!mld2q->mld2q_nsrcs)
3021 group = &mld2q->mld2q_mca;
3022 if (br->multicast_mld_version == 2 &&
3023 !ipv6_addr_any(&mld2q->mld2q_mca) &&
3024 mld2q->mld2q_suppress)
3025 goto out;
3026
3027 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
3028 }
3029
3030 is_general_query = group && ipv6_addr_any(group);
3031
3032 if (is_general_query) {
3033 saddr.proto = htons(ETH_P_IPV6);
3034 saddr.src.ip6 = ipv6_hdr(skb)->saddr;
3035
3036 br_ip6_multicast_query_received(br, port, &br->ip6_other_query,
3037 &saddr, max_delay);
3038 goto out;
3039 } else if (!group) {
3040 goto out;
3041 }
3042
3043 mp = br_mdb_ip6_get(br, group, vid);
3044 if (!mp)
3045 goto out;
3046
3047 max_delay *= br->multicast_last_member_count;
3048 if (mp->host_joined &&
3049 (timer_pending(&mp->timer) ?
3050 time_after(mp->timer.expires, now + max_delay) :
3051 try_to_del_timer_sync(&mp->timer) >= 0))
3052 mod_timer(&mp->timer, now + max_delay);
3053
3054 for (pp = &mp->ports;
3055 (p = mlock_dereference(*pp, br)) != NULL;
3056 pp = &p->next) {
3057 if (timer_pending(&p->timer) ?
3058 time_after(p->timer.expires, now + max_delay) :
3059 try_to_del_timer_sync(&p->timer) >= 0 &&
3060 (br->multicast_mld_version == 1 ||
3061 p->filter_mode == MCAST_EXCLUDE))
3062 mod_timer(&p->timer, now + max_delay);
3063 }
3064
3065 out:
3066 spin_unlock(&br->multicast_lock);
3067 return err;
3068 }
3069 #endif
3070
3071 static void
3072 br_multicast_leave_group(struct net_bridge *br,
3073 struct net_bridge_port *port,
3074 struct br_ip *group,
3075 struct bridge_mcast_other_query *other_query,
3076 struct bridge_mcast_own_query *own_query,
3077 const unsigned char *src)
3078 {
3079 struct net_bridge_mdb_entry *mp;
3080 struct net_bridge_port_group *p;
3081 unsigned long now;
3082 unsigned long time;
3083
3084 spin_lock(&br->multicast_lock);
3085 if (!netif_running(br->dev) ||
3086 (port && port->state == BR_STATE_DISABLED))
3087 goto out;
3088
3089 mp = br_mdb_ip_get(br, group);
3090 if (!mp)
3091 goto out;
3092
3093 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
3094 struct net_bridge_port_group __rcu **pp;
3095
3096 for (pp = &mp->ports;
3097 (p = mlock_dereference(*pp, br)) != NULL;
3098 pp = &p->next) {
3099 if (!br_port_group_equal(p, port, src))
3100 continue;
3101
3102 if (p->flags & MDB_PG_FLAGS_PERMANENT)
3103 break;
3104
3105 p->flags |= MDB_PG_FLAGS_FAST_LEAVE;
3106 br_multicast_del_pg(mp, p, pp);
3107 }
3108 goto out;
3109 }
3110
3111 if (timer_pending(&other_query->timer))
3112 goto out;
3113
3114 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
3115 __br_multicast_send_query(br, port, NULL, NULL, &mp->addr,
3116 false, 0, NULL);
3117
3118 time = jiffies + br->multicast_last_member_count *
3119 br->multicast_last_member_interval;
3120
3121 mod_timer(&own_query->timer, time);
3122
3123 for (p = mlock_dereference(mp->ports, br);
3124 p != NULL;
3125 p = mlock_dereference(p->next, br)) {
3126 if (!br_port_group_equal(p, port, src))
3127 continue;
3128
3129 if (!hlist_unhashed(&p->mglist) &&
3130 (timer_pending(&p->timer) ?
3131 time_after(p->timer.expires, time) :
3132 try_to_del_timer_sync(&p->timer) >= 0)) {
3133 mod_timer(&p->timer, time);
3134 }
3135
3136 break;
3137 }
3138 }
3139
3140 now = jiffies;
3141 time = now + br->multicast_last_member_count *
3142 br->multicast_last_member_interval;
3143
3144 if (!port) {
3145 if (mp->host_joined &&
3146 (timer_pending(&mp->timer) ?
3147 time_after(mp->timer.expires, time) :
3148 try_to_del_timer_sync(&mp->timer) >= 0)) {
3149 mod_timer(&mp->timer, time);
3150 }
3151
3152 goto out;
3153 }
3154
3155 for (p = mlock_dereference(mp->ports, br);
3156 p != NULL;
3157 p = mlock_dereference(p->next, br)) {
3158 if (p->key.port != port)
3159 continue;
3160
3161 if (!hlist_unhashed(&p->mglist) &&
3162 (timer_pending(&p->timer) ?
3163 time_after(p->timer.expires, time) :
3164 try_to_del_timer_sync(&p->timer) >= 0)) {
3165 mod_timer(&p->timer, time);
3166 }
3167
3168 break;
3169 }
3170 out:
3171 spin_unlock(&br->multicast_lock);
3172 }
3173
3174 static void br_ip4_multicast_leave_group(struct net_bridge *br,
3175 struct net_bridge_port *port,
3176 __be32 group,
3177 __u16 vid,
3178 const unsigned char *src)
3179 {
3180 struct br_ip br_group;
3181 struct bridge_mcast_own_query *own_query;
3182
3183 if (ipv4_is_local_multicast(group))
3184 return;
3185
3186 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
3187
3188 memset(&br_group, 0, sizeof(br_group));
3189 br_group.dst.ip4 = group;
3190 br_group.proto = htons(ETH_P_IP);
3191 br_group.vid = vid;
3192
3193 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
3194 own_query, src);
3195 }
3196
3197 #if IS_ENABLED(CONFIG_IPV6)
3198 static void br_ip6_multicast_leave_group(struct net_bridge *br,
3199 struct net_bridge_port *port,
3200 const struct in6_addr *group,
3201 __u16 vid,
3202 const unsigned char *src)
3203 {
3204 struct br_ip br_group;
3205 struct bridge_mcast_own_query *own_query;
3206
3207 if (ipv6_addr_is_ll_all_nodes(group))
3208 return;
3209
3210 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
3211
3212 memset(&br_group, 0, sizeof(br_group));
3213 br_group.dst.ip6 = *group;
3214 br_group.proto = htons(ETH_P_IPV6);
3215 br_group.vid = vid;
3216
3217 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
3218 own_query, src);
3219 }
3220 #endif
3221
3222 static void br_multicast_err_count(const struct net_bridge *br,
3223 const struct net_bridge_port *p,
3224 __be16 proto)
3225 {
3226 struct bridge_mcast_stats __percpu *stats;
3227 struct bridge_mcast_stats *pstats;
3228
3229 if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
3230 return;
3231
3232 if (p)
3233 stats = p->mcast_stats;
3234 else
3235 stats = br->mcast_stats;
3236 if (WARN_ON(!stats))
3237 return;
3238
3239 pstats = this_cpu_ptr(stats);
3240
3241 u64_stats_update_begin(&pstats->syncp);
3242 switch (proto) {
3243 case htons(ETH_P_IP):
3244 pstats->mstats.igmp_parse_errors++;
3245 break;
3246 #if IS_ENABLED(CONFIG_IPV6)
3247 case htons(ETH_P_IPV6):
3248 pstats->mstats.mld_parse_errors++;
3249 break;
3250 #endif
3251 }
3252 u64_stats_update_end(&pstats->syncp);
3253 }
3254
3255 static void br_multicast_pim(struct net_bridge *br,
3256 struct net_bridge_port *port,
3257 const struct sk_buff *skb)
3258 {
3259 unsigned int offset = skb_transport_offset(skb);
3260 struct pimhdr *pimhdr, _pimhdr;
3261
3262 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
3263 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
3264 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
3265 return;
3266
3267 spin_lock(&br->multicast_lock);
3268 br_ip4_multicast_mark_router(br, port);
3269 spin_unlock(&br->multicast_lock);
3270 }
3271
3272 static int br_ip4_multicast_mrd_rcv(struct net_bridge *br,
3273 struct net_bridge_port *port,
3274 struct sk_buff *skb)
3275 {
3276 if (ip_hdr(skb)->protocol != IPPROTO_IGMP ||
3277 igmp_hdr(skb)->type != IGMP_MRDISC_ADV)
3278 return -ENOMSG;
3279
3280 spin_lock(&br->multicast_lock);
3281 br_ip4_multicast_mark_router(br, port);
3282 spin_unlock(&br->multicast_lock);
3283
3284 return 0;
3285 }
3286
3287 static int br_multicast_ipv4_rcv(struct net_bridge *br,
3288 struct net_bridge_port *port,
3289 struct sk_buff *skb,
3290 u16 vid)
3291 {
3292 const unsigned char *src;
3293 struct igmphdr *ih;
3294 int err;
3295
3296 err = ip_mc_check_igmp(skb);
3297
3298 if (err == -ENOMSG) {
3299 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
3300 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
3301 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
3302 if (ip_hdr(skb)->protocol == IPPROTO_PIM)
3303 br_multicast_pim(br, port, skb);
3304 } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) {
3305 br_ip4_multicast_mrd_rcv(br, port, skb);
3306 }
3307
3308 return 0;
3309 } else if (err < 0) {
3310 br_multicast_err_count(br, port, skb->protocol);
3311 return err;
3312 }
3313
3314 ih = igmp_hdr(skb);
3315 src = eth_hdr(skb)->h_source;
3316 BR_INPUT_SKB_CB(skb)->igmp = ih->type;
3317
3318 switch (ih->type) {
3319 case IGMP_HOST_MEMBERSHIP_REPORT:
3320 case IGMPV2_HOST_MEMBERSHIP_REPORT:
3321 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
3322 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src,
3323 true);
3324 break;
3325 case IGMPV3_HOST_MEMBERSHIP_REPORT:
3326 err = br_ip4_multicast_igmp3_report(br, port, skb, vid);
3327 break;
3328 case IGMP_HOST_MEMBERSHIP_QUERY:
3329 br_ip4_multicast_query(br, port, skb, vid);
3330 break;
3331 case IGMP_HOST_LEAVE_MESSAGE:
3332 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
3333 break;
3334 }
3335
3336 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
3337 BR_MCAST_DIR_RX);
3338
3339 return err;
3340 }
3341
3342 #if IS_ENABLED(CONFIG_IPV6)
3343 static void br_ip6_multicast_mrd_rcv(struct net_bridge *br,
3344 struct net_bridge_port *port,
3345 struct sk_buff *skb)
3346 {
3347 if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV)
3348 return;
3349
3350 spin_lock(&br->multicast_lock);
3351 br_ip6_multicast_mark_router(br, port);
3352 spin_unlock(&br->multicast_lock);
3353 }
3354
3355 static int br_multicast_ipv6_rcv(struct net_bridge *br,
3356 struct net_bridge_port *port,
3357 struct sk_buff *skb,
3358 u16 vid)
3359 {
3360 const unsigned char *src;
3361 struct mld_msg *mld;
3362 int err;
3363
3364 err = ipv6_mc_check_mld(skb);
3365
3366 if (err == -ENOMSG || err == -ENODATA) {
3367 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
3368 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
3369 if (err == -ENODATA &&
3370 ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr))
3371 br_ip6_multicast_mrd_rcv(br, port, skb);
3372
3373 return 0;
3374 } else if (err < 0) {
3375 br_multicast_err_count(br, port, skb->protocol);
3376 return err;
3377 }
3378
3379 mld = (struct mld_msg *)skb_transport_header(skb);
3380 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
3381
3382 switch (mld->mld_type) {
3383 case ICMPV6_MGM_REPORT:
3384 src = eth_hdr(skb)->h_source;
3385 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
3386 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
3387 src, true);
3388 break;
3389 case ICMPV6_MLD2_REPORT:
3390 err = br_ip6_multicast_mld2_report(br, port, skb, vid);
3391 break;
3392 case ICMPV6_MGM_QUERY:
3393 err = br_ip6_multicast_query(br, port, skb, vid);
3394 break;
3395 case ICMPV6_MGM_REDUCTION:
3396 src = eth_hdr(skb)->h_source;
3397 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
3398 break;
3399 }
3400
3401 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
3402 BR_MCAST_DIR_RX);
3403
3404 return err;
3405 }
3406 #endif
3407
3408 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
3409 struct sk_buff *skb, u16 vid)
3410 {
3411 int ret = 0;
3412
3413 BR_INPUT_SKB_CB(skb)->igmp = 0;
3414 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
3415
3416 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
3417 return 0;
3418
3419 switch (skb->protocol) {
3420 case htons(ETH_P_IP):
3421 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
3422 break;
3423 #if IS_ENABLED(CONFIG_IPV6)
3424 case htons(ETH_P_IPV6):
3425 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
3426 break;
3427 #endif
3428 }
3429
3430 return ret;
3431 }
3432
3433 static void br_multicast_query_expired(struct net_bridge *br,
3434 struct bridge_mcast_own_query *query,
3435 struct bridge_mcast_querier *querier)
3436 {
3437 spin_lock(&br->multicast_lock);
3438 if (query->startup_sent < br->multicast_startup_query_count)
3439 query->startup_sent++;
3440
3441 RCU_INIT_POINTER(querier->port, NULL);
3442 br_multicast_send_query(br, NULL, query);
3443 spin_unlock(&br->multicast_lock);
3444 }
3445
3446 static void br_ip4_multicast_query_expired(struct timer_list *t)
3447 {
3448 struct net_bridge *br = from_timer(br, t, ip4_own_query.timer);
3449
3450 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
3451 }
3452
3453 #if IS_ENABLED(CONFIG_IPV6)
3454 static void br_ip6_multicast_query_expired(struct timer_list *t)
3455 {
3456 struct net_bridge *br = from_timer(br, t, ip6_own_query.timer);
3457
3458 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
3459 }
3460 #endif
3461
3462 static void br_multicast_gc_work(struct work_struct *work)
3463 {
3464 struct net_bridge *br = container_of(work, struct net_bridge,
3465 mcast_gc_work);
3466 HLIST_HEAD(deleted_head);
3467
3468 spin_lock_bh(&br->multicast_lock);
3469 hlist_move_list(&br->mcast_gc_list, &deleted_head);
3470 spin_unlock_bh(&br->multicast_lock);
3471
3472 br_multicast_gc(&deleted_head);
3473 }
3474
3475 void br_multicast_init(struct net_bridge *br)
3476 {
3477 br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX;
3478
3479 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
3480 br->multicast_last_member_count = 2;
3481 br->multicast_startup_query_count = 2;
3482
3483 br->multicast_last_member_interval = HZ;
3484 br->multicast_query_response_interval = 10 * HZ;
3485 br->multicast_startup_query_interval = 125 * HZ / 4;
3486 br->multicast_query_interval = 125 * HZ;
3487 br->multicast_querier_interval = 255 * HZ;
3488 br->multicast_membership_interval = 260 * HZ;
3489
3490 br->ip4_other_query.delay_time = 0;
3491 br->ip4_querier.port = NULL;
3492 br->multicast_igmp_version = 2;
3493 #if IS_ENABLED(CONFIG_IPV6)
3494 br->multicast_mld_version = 1;
3495 br->ip6_other_query.delay_time = 0;
3496 br->ip6_querier.port = NULL;
3497 #endif
3498 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true);
3499 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
3500
3501 spin_lock_init(&br->multicast_lock);
3502 timer_setup(&br->ip4_mc_router_timer,
3503 br_ip4_multicast_local_router_expired, 0);
3504 timer_setup(&br->ip4_other_query.timer,
3505 br_ip4_multicast_querier_expired, 0);
3506 timer_setup(&br->ip4_own_query.timer,
3507 br_ip4_multicast_query_expired, 0);
3508 #if IS_ENABLED(CONFIG_IPV6)
3509 timer_setup(&br->ip6_mc_router_timer,
3510 br_ip6_multicast_local_router_expired, 0);
3511 timer_setup(&br->ip6_other_query.timer,
3512 br_ip6_multicast_querier_expired, 0);
3513 timer_setup(&br->ip6_own_query.timer,
3514 br_ip6_multicast_query_expired, 0);
3515 #endif
3516 INIT_HLIST_HEAD(&br->mdb_list);
3517 INIT_HLIST_HEAD(&br->mcast_gc_list);
3518 INIT_WORK(&br->mcast_gc_work, br_multicast_gc_work);
3519 }
3520
3521 static void br_ip4_multicast_join_snoopers(struct net_bridge *br)
3522 {
3523 struct in_device *in_dev = in_dev_get(br->dev);
3524
3525 if (!in_dev)
3526 return;
3527
3528 __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
3529 in_dev_put(in_dev);
3530 }
3531
3532 #if IS_ENABLED(CONFIG_IPV6)
3533 static void br_ip6_multicast_join_snoopers(struct net_bridge *br)
3534 {
3535 struct in6_addr addr;
3536
3537 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
3538 ipv6_dev_mc_inc(br->dev, &addr);
3539 }
3540 #else
3541 static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br)
3542 {
3543 }
3544 #endif
3545
3546 void br_multicast_join_snoopers(struct net_bridge *br)
3547 {
3548 br_ip4_multicast_join_snoopers(br);
3549 br_ip6_multicast_join_snoopers(br);
3550 }
3551
3552 static void br_ip4_multicast_leave_snoopers(struct net_bridge *br)
3553 {
3554 struct in_device *in_dev = in_dev_get(br->dev);
3555
3556 if (WARN_ON(!in_dev))
3557 return;
3558
3559 __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
3560 in_dev_put(in_dev);
3561 }
3562
3563 #if IS_ENABLED(CONFIG_IPV6)
3564 static void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
3565 {
3566 struct in6_addr addr;
3567
3568 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
3569 ipv6_dev_mc_dec(br->dev, &addr);
3570 }
3571 #else
3572 static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
3573 {
3574 }
3575 #endif
3576
3577 void br_multicast_leave_snoopers(struct net_bridge *br)
3578 {
3579 br_ip4_multicast_leave_snoopers(br);
3580 br_ip6_multicast_leave_snoopers(br);
3581 }
3582
3583 static void __br_multicast_open(struct net_bridge *br,
3584 struct bridge_mcast_own_query *query)
3585 {
3586 query->startup_sent = 0;
3587
3588 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
3589 return;
3590
3591 mod_timer(&query->timer, jiffies);
3592 }
3593
3594 void br_multicast_open(struct net_bridge *br)
3595 {
3596 __br_multicast_open(br, &br->ip4_own_query);
3597 #if IS_ENABLED(CONFIG_IPV6)
3598 __br_multicast_open(br, &br->ip6_own_query);
3599 #endif
3600 }
3601
3602 void br_multicast_stop(struct net_bridge *br)
3603 {
3604 del_timer_sync(&br->ip4_mc_router_timer);
3605 del_timer_sync(&br->ip4_other_query.timer);
3606 del_timer_sync(&br->ip4_own_query.timer);
3607 #if IS_ENABLED(CONFIG_IPV6)
3608 del_timer_sync(&br->ip6_mc_router_timer);
3609 del_timer_sync(&br->ip6_other_query.timer);
3610 del_timer_sync(&br->ip6_own_query.timer);
3611 #endif
3612 }
3613
3614 void br_multicast_dev_del(struct net_bridge *br)
3615 {
3616 struct net_bridge_mdb_entry *mp;
3617 HLIST_HEAD(deleted_head);
3618 struct hlist_node *tmp;
3619
3620 spin_lock_bh(&br->multicast_lock);
3621 hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node)
3622 br_multicast_del_mdb_entry(mp);
3623 hlist_move_list(&br->mcast_gc_list, &deleted_head);
3624 spin_unlock_bh(&br->multicast_lock);
3625
3626 br_multicast_gc(&deleted_head);
3627 cancel_work_sync(&br->mcast_gc_work);
3628
3629 rcu_barrier();
3630 }
3631
3632 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
3633 {
3634 int err = -EINVAL;
3635
3636 spin_lock_bh(&br->multicast_lock);
3637
3638 switch (val) {
3639 case MDB_RTR_TYPE_DISABLED:
3640 case MDB_RTR_TYPE_PERM:
3641 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM);
3642 del_timer(&br->ip4_mc_router_timer);
3643 #if IS_ENABLED(CONFIG_IPV6)
3644 del_timer(&br->ip6_mc_router_timer);
3645 #endif
3646 br->multicast_router = val;
3647 err = 0;
3648 break;
3649 case MDB_RTR_TYPE_TEMP_QUERY:
3650 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
3651 br_mc_router_state_change(br, false);
3652 br->multicast_router = val;
3653 err = 0;
3654 break;
3655 }
3656
3657 spin_unlock_bh(&br->multicast_lock);
3658
3659 return err;
3660 }
3661
3662 static void
3663 br_multicast_rport_del_notify(struct net_bridge_port *p, bool deleted)
3664 {
3665 if (!deleted)
3666 return;
3667
3668 /* For backwards compatibility for now, only notify if there is
3669 * no multicast router anymore for both IPv4 and IPv6.
3670 */
3671 if (!hlist_unhashed(&p->ip4_rlist))
3672 return;
3673 #if IS_ENABLED(CONFIG_IPV6)
3674 if (!hlist_unhashed(&p->ip6_rlist))
3675 return;
3676 #endif
3677
3678 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
3679 br_port_mc_router_state_change(p, false);
3680
3681 /* don't allow timer refresh */
3682 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
3683 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
3684 }
3685
3686 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
3687 {
3688 struct net_bridge *br = p->br;
3689 unsigned long now = jiffies;
3690 int err = -EINVAL;
3691 bool del = false;
3692
3693 spin_lock(&br->multicast_lock);
3694 if (p->multicast_router == val) {
3695 /* Refresh the temp router port timer */
3696 if (p->multicast_router == MDB_RTR_TYPE_TEMP) {
3697 mod_timer(&p->ip4_mc_router_timer,
3698 now + br->multicast_querier_interval);
3699 #if IS_ENABLED(CONFIG_IPV6)
3700 mod_timer(&p->ip6_mc_router_timer,
3701 now + br->multicast_querier_interval);
3702 #endif
3703 }
3704 err = 0;
3705 goto unlock;
3706 }
3707 switch (val) {
3708 case MDB_RTR_TYPE_DISABLED:
3709 p->multicast_router = MDB_RTR_TYPE_DISABLED;
3710 del |= br_ip4_multicast_rport_del(p);
3711 del_timer(&p->ip4_mc_router_timer);
3712 del |= br_ip6_multicast_rport_del(p);
3713 #if IS_ENABLED(CONFIG_IPV6)
3714 del_timer(&p->ip6_mc_router_timer);
3715 #endif
3716 br_multicast_rport_del_notify(p, del);
3717 break;
3718 case MDB_RTR_TYPE_TEMP_QUERY:
3719 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
3720 del |= br_ip4_multicast_rport_del(p);
3721 del |= br_ip6_multicast_rport_del(p);
3722 br_multicast_rport_del_notify(p, del);
3723 break;
3724 case MDB_RTR_TYPE_PERM:
3725 p->multicast_router = MDB_RTR_TYPE_PERM;
3726 del_timer(&p->ip4_mc_router_timer);
3727 br_ip4_multicast_add_router(br, p);
3728 #if IS_ENABLED(CONFIG_IPV6)
3729 del_timer(&p->ip6_mc_router_timer);
3730 #endif
3731 br_ip6_multicast_add_router(br, p);
3732 break;
3733 case MDB_RTR_TYPE_TEMP:
3734 p->multicast_router = MDB_RTR_TYPE_TEMP;
3735 br_ip4_multicast_mark_router(br, p);
3736 br_ip6_multicast_mark_router(br, p);
3737 break;
3738 default:
3739 goto unlock;
3740 }
3741 err = 0;
3742 unlock:
3743 spin_unlock(&br->multicast_lock);
3744
3745 return err;
3746 }
3747
3748 static void br_multicast_start_querier(struct net_bridge *br,
3749 struct bridge_mcast_own_query *query)
3750 {
3751 struct net_bridge_port *port;
3752
3753 __br_multicast_open(br, query);
3754
3755 rcu_read_lock();
3756 list_for_each_entry_rcu(port, &br->port_list, list) {
3757 if (port->state == BR_STATE_DISABLED ||
3758 port->state == BR_STATE_BLOCKING)
3759 continue;
3760
3761 if (query == &br->ip4_own_query)
3762 br_multicast_enable(&port->ip4_own_query);
3763 #if IS_ENABLED(CONFIG_IPV6)
3764 else
3765 br_multicast_enable(&port->ip6_own_query);
3766 #endif
3767 }
3768 rcu_read_unlock();
3769 }
3770
3771 int br_multicast_toggle(struct net_bridge *br, unsigned long val,
3772 struct netlink_ext_ack *extack)
3773 {
3774 struct net_bridge_port *port;
3775 bool change_snoopers = false;
3776 int err = 0;
3777
3778 spin_lock_bh(&br->multicast_lock);
3779 if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val)
3780 goto unlock;
3781
3782 err = br_mc_disabled_update(br->dev, val, extack);
3783 if (err == -EOPNOTSUPP)
3784 err = 0;
3785 if (err)
3786 goto unlock;
3787
3788 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val);
3789 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) {
3790 change_snoopers = true;
3791 goto unlock;
3792 }
3793
3794 if (!netif_running(br->dev))
3795 goto unlock;
3796
3797 br_multicast_open(br);
3798 list_for_each_entry(port, &br->port_list, list)
3799 __br_multicast_enable_port(port);
3800
3801 change_snoopers = true;
3802
3803 unlock:
3804 spin_unlock_bh(&br->multicast_lock);
3805
3806 /* br_multicast_join_snoopers has the potential to cause
3807 * an MLD Report/Leave to be delivered to br_multicast_rcv,
3808 * which would in turn call br_multicast_add_group, which would
3809 * attempt to acquire multicast_lock. This function should be
3810 * called after the lock has been released to avoid deadlocks on
3811 * multicast_lock.
3812 *
3813 * br_multicast_leave_snoopers does not have the problem since
3814 * br_multicast_rcv first checks BROPT_MULTICAST_ENABLED, and
3815 * returns without calling br_multicast_ipv4/6_rcv if it's not
3816 * enabled. Moved both functions out just for symmetry.
3817 */
3818 if (change_snoopers) {
3819 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
3820 br_multicast_join_snoopers(br);
3821 else
3822 br_multicast_leave_snoopers(br);
3823 }
3824
3825 return err;
3826 }
3827
3828 bool br_multicast_enabled(const struct net_device *dev)
3829 {
3830 struct net_bridge *br = netdev_priv(dev);
3831
3832 return !!br_opt_get(br, BROPT_MULTICAST_ENABLED);
3833 }
3834 EXPORT_SYMBOL_GPL(br_multicast_enabled);
3835
3836 bool br_multicast_router(const struct net_device *dev)
3837 {
3838 struct net_bridge *br = netdev_priv(dev);
3839 bool is_router;
3840
3841 spin_lock_bh(&br->multicast_lock);
3842 is_router = br_multicast_is_router(br, NULL);
3843 spin_unlock_bh(&br->multicast_lock);
3844 return is_router;
3845 }
3846 EXPORT_SYMBOL_GPL(br_multicast_router);
3847
3848 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
3849 {
3850 unsigned long max_delay;
3851
3852 val = !!val;
3853
3854 spin_lock_bh(&br->multicast_lock);
3855 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val)
3856 goto unlock;
3857
3858 br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val);
3859 if (!val)
3860 goto unlock;
3861
3862 max_delay = br->multicast_query_response_interval;
3863
3864 if (!timer_pending(&br->ip4_other_query.timer))
3865 br->ip4_other_query.delay_time = jiffies + max_delay;
3866
3867 br_multicast_start_querier(br, &br->ip4_own_query);
3868
3869 #if IS_ENABLED(CONFIG_IPV6)
3870 if (!timer_pending(&br->ip6_other_query.timer))
3871 br->ip6_other_query.delay_time = jiffies + max_delay;
3872
3873 br_multicast_start_querier(br, &br->ip6_own_query);
3874 #endif
3875
3876 unlock:
3877 spin_unlock_bh(&br->multicast_lock);
3878
3879 return 0;
3880 }
3881
3882 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
3883 {
3884 /* Currently we support only version 2 and 3 */
3885 switch (val) {
3886 case 2:
3887 case 3:
3888 break;
3889 default:
3890 return -EINVAL;
3891 }
3892
3893 spin_lock_bh(&br->multicast_lock);
3894 br->multicast_igmp_version = val;
3895 spin_unlock_bh(&br->multicast_lock);
3896
3897 return 0;
3898 }
3899
3900 #if IS_ENABLED(CONFIG_IPV6)
3901 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
3902 {
3903 /* Currently we support version 1 and 2 */
3904 switch (val) {
3905 case 1:
3906 case 2:
3907 break;
3908 default:
3909 return -EINVAL;
3910 }
3911
3912 spin_lock_bh(&br->multicast_lock);
3913 br->multicast_mld_version = val;
3914 spin_unlock_bh(&br->multicast_lock);
3915
3916 return 0;
3917 }
3918 #endif
3919
3920 /**
3921 * br_multicast_list_adjacent - Returns snooped multicast addresses
3922 * @dev: The bridge port adjacent to which to retrieve addresses
3923 * @br_ip_list: The list to store found, snooped multicast IP addresses in
3924 *
3925 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
3926 * snooping feature on all bridge ports of dev's bridge device, excluding
3927 * the addresses from dev itself.
3928 *
3929 * Returns the number of items added to br_ip_list.
3930 *
3931 * Notes:
3932 * - br_ip_list needs to be initialized by caller
3933 * - br_ip_list might contain duplicates in the end
3934 * (needs to be taken care of by caller)
3935 * - br_ip_list needs to be freed by caller
3936 */
3937 int br_multicast_list_adjacent(struct net_device *dev,
3938 struct list_head *br_ip_list)
3939 {
3940 struct net_bridge *br;
3941 struct net_bridge_port *port;
3942 struct net_bridge_port_group *group;
3943 struct br_ip_list *entry;
3944 int count = 0;
3945
3946 rcu_read_lock();
3947 if (!br_ip_list || !netif_is_bridge_port(dev))
3948 goto unlock;
3949
3950 port = br_port_get_rcu(dev);
3951 if (!port || !port->br)
3952 goto unlock;
3953
3954 br = port->br;
3955
3956 list_for_each_entry_rcu(port, &br->port_list, list) {
3957 if (!port->dev || port->dev == dev)
3958 continue;
3959
3960 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
3961 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
3962 if (!entry)
3963 goto unlock;
3964
3965 entry->addr = group->key.addr;
3966 list_add(&entry->list, br_ip_list);
3967 count++;
3968 }
3969 }
3970
3971 unlock:
3972 rcu_read_unlock();
3973 return count;
3974 }
3975 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
3976
3977 /**
3978 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
3979 * @dev: The bridge port providing the bridge on which to check for a querier
3980 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
3981 *
3982 * Checks whether the given interface has a bridge on top and if so returns
3983 * true if a valid querier exists anywhere on the bridged link layer.
3984 * Otherwise returns false.
3985 */
3986 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
3987 {
3988 struct net_bridge *br;
3989 struct net_bridge_port *port;
3990 struct ethhdr eth;
3991 bool ret = false;
3992
3993 rcu_read_lock();
3994 if (!netif_is_bridge_port(dev))
3995 goto unlock;
3996
3997 port = br_port_get_rcu(dev);
3998 if (!port || !port->br)
3999 goto unlock;
4000
4001 br = port->br;
4002
4003 memset(&eth, 0, sizeof(eth));
4004 eth.h_proto = htons(proto);
4005
4006 ret = br_multicast_querier_exists(br, &eth, NULL);
4007
4008 unlock:
4009 rcu_read_unlock();
4010 return ret;
4011 }
4012 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
4013
4014 /**
4015 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
4016 * @dev: The bridge port adjacent to which to check for a querier
4017 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
4018 *
4019 * Checks whether the given interface has a bridge on top and if so returns
4020 * true if a selected querier is behind one of the other ports of this
4021 * bridge. Otherwise returns false.
4022 */
4023 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
4024 {
4025 struct net_bridge *br;
4026 struct net_bridge_port *port;
4027 bool ret = false;
4028
4029 rcu_read_lock();
4030 if (!netif_is_bridge_port(dev))
4031 goto unlock;
4032
4033 port = br_port_get_rcu(dev);
4034 if (!port || !port->br)
4035 goto unlock;
4036
4037 br = port->br;
4038
4039 switch (proto) {
4040 case ETH_P_IP:
4041 if (!timer_pending(&br->ip4_other_query.timer) ||
4042 rcu_dereference(br->ip4_querier.port) == port)
4043 goto unlock;
4044 break;
4045 #if IS_ENABLED(CONFIG_IPV6)
4046 case ETH_P_IPV6:
4047 if (!timer_pending(&br->ip6_other_query.timer) ||
4048 rcu_dereference(br->ip6_querier.port) == port)
4049 goto unlock;
4050 break;
4051 #endif
4052 default:
4053 goto unlock;
4054 }
4055
4056 ret = true;
4057 unlock:
4058 rcu_read_unlock();
4059 return ret;
4060 }
4061 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
4062
4063 /**
4064 * br_multicast_has_router_adjacent - Checks for a router behind a bridge port
4065 * @dev: The bridge port adjacent to which to check for a multicast router
4066 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
4067 *
4068 * Checks whether the given interface has a bridge on top and if so returns
4069 * true if a multicast router is behind one of the other ports of this
4070 * bridge. Otherwise returns false.
4071 */
4072 bool br_multicast_has_router_adjacent(struct net_device *dev, int proto)
4073 {
4074 struct net_bridge_port *port, *p;
4075 bool ret = false;
4076
4077 rcu_read_lock();
4078 port = br_port_get_check_rcu(dev);
4079 if (!port)
4080 goto unlock;
4081
4082 switch (proto) {
4083 case ETH_P_IP:
4084 hlist_for_each_entry_rcu(p, &port->br->ip4_mc_router_list,
4085 ip4_rlist) {
4086 if (p == port)
4087 continue;
4088
4089 ret = true;
4090 goto unlock;
4091 }
4092 break;
4093 #if IS_ENABLED(CONFIG_IPV6)
4094 case ETH_P_IPV6:
4095 hlist_for_each_entry_rcu(p, &port->br->ip6_mc_router_list,
4096 ip6_rlist) {
4097 if (p == port)
4098 continue;
4099
4100 ret = true;
4101 goto unlock;
4102 }
4103 break;
4104 #endif
4105 default:
4106 /* when compiled without IPv6 support, be conservative and
4107 * always assume presence of an IPv6 multicast router
4108 */
4109 ret = true;
4110 }
4111
4112 unlock:
4113 rcu_read_unlock();
4114 return ret;
4115 }
4116 EXPORT_SYMBOL_GPL(br_multicast_has_router_adjacent);
4117
4118 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
4119 const struct sk_buff *skb, u8 type, u8 dir)
4120 {
4121 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
4122 __be16 proto = skb->protocol;
4123 unsigned int t_len;
4124
4125 u64_stats_update_begin(&pstats->syncp);
4126 switch (proto) {
4127 case htons(ETH_P_IP):
4128 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
4129 switch (type) {
4130 case IGMP_HOST_MEMBERSHIP_REPORT:
4131 pstats->mstats.igmp_v1reports[dir]++;
4132 break;
4133 case IGMPV2_HOST_MEMBERSHIP_REPORT:
4134 pstats->mstats.igmp_v2reports[dir]++;
4135 break;
4136 case IGMPV3_HOST_MEMBERSHIP_REPORT:
4137 pstats->mstats.igmp_v3reports[dir]++;
4138 break;
4139 case IGMP_HOST_MEMBERSHIP_QUERY:
4140 if (t_len != sizeof(struct igmphdr)) {
4141 pstats->mstats.igmp_v3queries[dir]++;
4142 } else {
4143 unsigned int offset = skb_transport_offset(skb);
4144 struct igmphdr *ih, _ihdr;
4145
4146 ih = skb_header_pointer(skb, offset,
4147 sizeof(_ihdr), &_ihdr);
4148 if (!ih)
4149 break;
4150 if (!ih->code)
4151 pstats->mstats.igmp_v1queries[dir]++;
4152 else
4153 pstats->mstats.igmp_v2queries[dir]++;
4154 }
4155 break;
4156 case IGMP_HOST_LEAVE_MESSAGE:
4157 pstats->mstats.igmp_leaves[dir]++;
4158 break;
4159 }
4160 break;
4161 #if IS_ENABLED(CONFIG_IPV6)
4162 case htons(ETH_P_IPV6):
4163 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
4164 sizeof(struct ipv6hdr);
4165 t_len -= skb_network_header_len(skb);
4166 switch (type) {
4167 case ICMPV6_MGM_REPORT:
4168 pstats->mstats.mld_v1reports[dir]++;
4169 break;
4170 case ICMPV6_MLD2_REPORT:
4171 pstats->mstats.mld_v2reports[dir]++;
4172 break;
4173 case ICMPV6_MGM_QUERY:
4174 if (t_len != sizeof(struct mld_msg))
4175 pstats->mstats.mld_v2queries[dir]++;
4176 else
4177 pstats->mstats.mld_v1queries[dir]++;
4178 break;
4179 case ICMPV6_MGM_REDUCTION:
4180 pstats->mstats.mld_leaves[dir]++;
4181 break;
4182 }
4183 break;
4184 #endif /* CONFIG_IPV6 */
4185 }
4186 u64_stats_update_end(&pstats->syncp);
4187 }
4188
4189 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
4190 const struct sk_buff *skb, u8 type, u8 dir)
4191 {
4192 struct bridge_mcast_stats __percpu *stats;
4193
4194 /* if multicast_disabled is true then igmp type can't be set */
4195 if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
4196 return;
4197
4198 if (p)
4199 stats = p->mcast_stats;
4200 else
4201 stats = br->mcast_stats;
4202 if (WARN_ON(!stats))
4203 return;
4204
4205 br_mcast_stats_add(stats, skb, type, dir);
4206 }
4207
4208 int br_multicast_init_stats(struct net_bridge *br)
4209 {
4210 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
4211 if (!br->mcast_stats)
4212 return -ENOMEM;
4213
4214 return 0;
4215 }
4216
4217 void br_multicast_uninit_stats(struct net_bridge *br)
4218 {
4219 free_percpu(br->mcast_stats);
4220 }
4221
4222 /* noinline for https://bugs.llvm.org/show_bug.cgi?id=45802#c9 */
4223 static noinline_for_stack void mcast_stats_add_dir(u64 *dst, u64 *src)
4224 {
4225 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
4226 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
4227 }
4228
4229 void br_multicast_get_stats(const struct net_bridge *br,
4230 const struct net_bridge_port *p,
4231 struct br_mcast_stats *dest)
4232 {
4233 struct bridge_mcast_stats __percpu *stats;
4234 struct br_mcast_stats tdst;
4235 int i;
4236
4237 memset(dest, 0, sizeof(*dest));
4238 if (p)
4239 stats = p->mcast_stats;
4240 else
4241 stats = br->mcast_stats;
4242 if (WARN_ON(!stats))
4243 return;
4244
4245 memset(&tdst, 0, sizeof(tdst));
4246 for_each_possible_cpu(i) {
4247 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
4248 struct br_mcast_stats temp;
4249 unsigned int start;
4250
4251 do {
4252 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
4253 memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
4254 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
4255
4256 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
4257 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
4258 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
4259 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
4260 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
4261 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
4262 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
4263 tdst.igmp_parse_errors += temp.igmp_parse_errors;
4264
4265 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
4266 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
4267 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
4268 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
4269 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
4270 tdst.mld_parse_errors += temp.mld_parse_errors;
4271 }
4272 memcpy(dest, &tdst, sizeof(*dest));
4273 }
4274
4275 int br_mdb_hash_init(struct net_bridge *br)
4276 {
4277 int err;
4278
4279 err = rhashtable_init(&br->sg_port_tbl, &br_sg_port_rht_params);
4280 if (err)
4281 return err;
4282
4283 err = rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params);
4284 if (err) {
4285 rhashtable_destroy(&br->sg_port_tbl);
4286 return err;
4287 }
4288
4289 return 0;
4290 }
4291
4292 void br_mdb_hash_fini(struct net_bridge *br)
4293 {
4294 rhashtable_destroy(&br->sg_port_tbl);
4295 rhashtable_destroy(&br->mdb_hash_tbl);
4296 }
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