Loading...
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#include <trace/events/bridge.h>
35
36#include "br_private.h"
37#include "br_private_mcast_eht.h"
38
39static const struct rhashtable_params br_mdb_rht_params = {
40 .head_offset = offsetof(struct net_bridge_mdb_entry, rhnode),
41 .key_offset = offsetof(struct net_bridge_mdb_entry, addr),
42 .key_len = sizeof(struct br_ip),
43 .automatic_shrinking = true,
44};
45
46static const struct rhashtable_params br_sg_port_rht_params = {
47 .head_offset = offsetof(struct net_bridge_port_group, rhnode),
48 .key_offset = offsetof(struct net_bridge_port_group, key),
49 .key_len = sizeof(struct net_bridge_port_group_sg_key),
50 .automatic_shrinking = true,
51};
52
53static void br_multicast_start_querier(struct net_bridge_mcast *brmctx,
54 struct bridge_mcast_own_query *query);
55static void br_ip4_multicast_add_router(struct net_bridge_mcast *brmctx,
56 struct net_bridge_mcast_port *pmctx);
57static void br_ip4_multicast_leave_group(struct net_bridge_mcast *brmctx,
58 struct net_bridge_mcast_port *pmctx,
59 __be32 group,
60 __u16 vid,
61 const unsigned char *src);
62static void br_multicast_port_group_rexmit(struct timer_list *t);
63
64static void
65br_multicast_rport_del_notify(struct net_bridge_mcast_port *pmctx, bool deleted);
66static void br_ip6_multicast_add_router(struct net_bridge_mcast *brmctx,
67 struct net_bridge_mcast_port *pmctx);
68#if IS_ENABLED(CONFIG_IPV6)
69static void br_ip6_multicast_leave_group(struct net_bridge_mcast *brmctx,
70 struct net_bridge_mcast_port *pmctx,
71 const struct in6_addr *group,
72 __u16 vid, const unsigned char *src);
73#endif
74static struct net_bridge_port_group *
75__br_multicast_add_group(struct net_bridge_mcast *brmctx,
76 struct net_bridge_mcast_port *pmctx,
77 struct br_ip *group,
78 const unsigned char *src,
79 u8 filter_mode,
80 bool igmpv2_mldv1,
81 bool blocked);
82static void br_multicast_find_del_pg(struct net_bridge *br,
83 struct net_bridge_port_group *pg);
84static void __br_multicast_stop(struct net_bridge_mcast *brmctx);
85
86static int br_mc_disabled_update(struct net_device *dev, bool value,
87 struct netlink_ext_ack *extack);
88
89static struct net_bridge_port_group *
90br_sg_port_find(struct net_bridge *br,
91 struct net_bridge_port_group_sg_key *sg_p)
92{
93 lockdep_assert_held_once(&br->multicast_lock);
94
95 return rhashtable_lookup_fast(&br->sg_port_tbl, sg_p,
96 br_sg_port_rht_params);
97}
98
99static struct net_bridge_mdb_entry *br_mdb_ip_get_rcu(struct net_bridge *br,
100 struct br_ip *dst)
101{
102 return rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
103}
104
105struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge *br,
106 struct br_ip *dst)
107{
108 struct net_bridge_mdb_entry *ent;
109
110 lockdep_assert_held_once(&br->multicast_lock);
111
112 rcu_read_lock();
113 ent = rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
114 rcu_read_unlock();
115
116 return ent;
117}
118
119static struct net_bridge_mdb_entry *br_mdb_ip4_get(struct net_bridge *br,
120 __be32 dst, __u16 vid)
121{
122 struct br_ip br_dst;
123
124 memset(&br_dst, 0, sizeof(br_dst));
125 br_dst.dst.ip4 = dst;
126 br_dst.proto = htons(ETH_P_IP);
127 br_dst.vid = vid;
128
129 return br_mdb_ip_get(br, &br_dst);
130}
131
132#if IS_ENABLED(CONFIG_IPV6)
133static struct net_bridge_mdb_entry *br_mdb_ip6_get(struct net_bridge *br,
134 const struct in6_addr *dst,
135 __u16 vid)
136{
137 struct br_ip br_dst;
138
139 memset(&br_dst, 0, sizeof(br_dst));
140 br_dst.dst.ip6 = *dst;
141 br_dst.proto = htons(ETH_P_IPV6);
142 br_dst.vid = vid;
143
144 return br_mdb_ip_get(br, &br_dst);
145}
146#endif
147
148struct net_bridge_mdb_entry *
149br_mdb_entry_skb_get(struct net_bridge_mcast *brmctx, struct sk_buff *skb,
150 u16 vid)
151{
152 struct net_bridge *br = brmctx->br;
153 struct br_ip ip;
154
155 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
156 br_multicast_ctx_vlan_global_disabled(brmctx))
157 return NULL;
158
159 if (BR_INPUT_SKB_CB(skb)->igmp)
160 return NULL;
161
162 memset(&ip, 0, sizeof(ip));
163 ip.proto = skb->protocol;
164 ip.vid = vid;
165
166 switch (skb->protocol) {
167 case htons(ETH_P_IP):
168 ip.dst.ip4 = ip_hdr(skb)->daddr;
169 if (brmctx->multicast_igmp_version == 3) {
170 struct net_bridge_mdb_entry *mdb;
171
172 ip.src.ip4 = ip_hdr(skb)->saddr;
173 mdb = br_mdb_ip_get_rcu(br, &ip);
174 if (mdb)
175 return mdb;
176 ip.src.ip4 = 0;
177 }
178 break;
179#if IS_ENABLED(CONFIG_IPV6)
180 case htons(ETH_P_IPV6):
181 ip.dst.ip6 = ipv6_hdr(skb)->daddr;
182 if (brmctx->multicast_mld_version == 2) {
183 struct net_bridge_mdb_entry *mdb;
184
185 ip.src.ip6 = ipv6_hdr(skb)->saddr;
186 mdb = br_mdb_ip_get_rcu(br, &ip);
187 if (mdb)
188 return mdb;
189 memset(&ip.src.ip6, 0, sizeof(ip.src.ip6));
190 }
191 break;
192#endif
193 default:
194 ip.proto = 0;
195 ether_addr_copy(ip.dst.mac_addr, eth_hdr(skb)->h_dest);
196 }
197
198 return br_mdb_ip_get_rcu(br, &ip);
199}
200
201/* IMPORTANT: this function must be used only when the contexts cannot be
202 * passed down (e.g. timer) and must be used for read-only purposes because
203 * the vlan snooping option can change, so it can return any context
204 * (non-vlan or vlan). Its initial intended purpose is to read timer values
205 * from the *current* context based on the option. At worst that could lead
206 * to inconsistent timers when the contexts are changed, i.e. src timer
207 * which needs to re-arm with a specific delay taken from the old context
208 */
209static struct net_bridge_mcast_port *
210br_multicast_pg_to_port_ctx(const struct net_bridge_port_group *pg)
211{
212 struct net_bridge_mcast_port *pmctx = &pg->key.port->multicast_ctx;
213 struct net_bridge_vlan *vlan;
214
215 lockdep_assert_held_once(&pg->key.port->br->multicast_lock);
216
217 /* if vlan snooping is disabled use the port's multicast context */
218 if (!pg->key.addr.vid ||
219 !br_opt_get(pg->key.port->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED))
220 goto out;
221
222 /* locking is tricky here, due to different rules for multicast and
223 * vlans we need to take rcu to find the vlan and make sure it has
224 * the BR_VLFLAG_MCAST_ENABLED flag set, it can only change under
225 * multicast_lock which must be already held here, so the vlan's pmctx
226 * can safely be used on return
227 */
228 rcu_read_lock();
229 vlan = br_vlan_find(nbp_vlan_group_rcu(pg->key.port), pg->key.addr.vid);
230 if (vlan && !br_multicast_port_ctx_vlan_disabled(&vlan->port_mcast_ctx))
231 pmctx = &vlan->port_mcast_ctx;
232 else
233 pmctx = NULL;
234 rcu_read_unlock();
235out:
236 return pmctx;
237}
238
239static struct net_bridge_mcast_port *
240br_multicast_port_vid_to_port_ctx(struct net_bridge_port *port, u16 vid)
241{
242 struct net_bridge_mcast_port *pmctx = NULL;
243 struct net_bridge_vlan *vlan;
244
245 lockdep_assert_held_once(&port->br->multicast_lock);
246
247 if (!br_opt_get(port->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED))
248 return NULL;
249
250 /* Take RCU to access the vlan. */
251 rcu_read_lock();
252
253 vlan = br_vlan_find(nbp_vlan_group_rcu(port), vid);
254 if (vlan && !br_multicast_port_ctx_vlan_disabled(&vlan->port_mcast_ctx))
255 pmctx = &vlan->port_mcast_ctx;
256
257 rcu_read_unlock();
258
259 return pmctx;
260}
261
262/* when snooping we need to check if the contexts should be used
263 * in the following order:
264 * - if pmctx is non-NULL (port), check if it should be used
265 * - if pmctx is NULL (bridge), check if brmctx should be used
266 */
267static bool
268br_multicast_ctx_should_use(const struct net_bridge_mcast *brmctx,
269 const struct net_bridge_mcast_port *pmctx)
270{
271 if (!netif_running(brmctx->br->dev))
272 return false;
273
274 if (pmctx)
275 return !br_multicast_port_ctx_state_disabled(pmctx);
276 else
277 return !br_multicast_ctx_vlan_disabled(brmctx);
278}
279
280static bool br_port_group_equal(struct net_bridge_port_group *p,
281 struct net_bridge_port *port,
282 const unsigned char *src)
283{
284 if (p->key.port != port)
285 return false;
286
287 if (!(port->flags & BR_MULTICAST_TO_UNICAST))
288 return true;
289
290 return ether_addr_equal(src, p->eth_addr);
291}
292
293static void __fwd_add_star_excl(struct net_bridge_mcast_port *pmctx,
294 struct net_bridge_port_group *pg,
295 struct br_ip *sg_ip)
296{
297 struct net_bridge_port_group_sg_key sg_key;
298 struct net_bridge_port_group *src_pg;
299 struct net_bridge_mcast *brmctx;
300
301 memset(&sg_key, 0, sizeof(sg_key));
302 brmctx = br_multicast_port_ctx_get_global(pmctx);
303 sg_key.port = pg->key.port;
304 sg_key.addr = *sg_ip;
305 if (br_sg_port_find(brmctx->br, &sg_key))
306 return;
307
308 src_pg = __br_multicast_add_group(brmctx, pmctx,
309 sg_ip, pg->eth_addr,
310 MCAST_INCLUDE, false, false);
311 if (IS_ERR_OR_NULL(src_pg) ||
312 src_pg->rt_protocol != RTPROT_KERNEL)
313 return;
314
315 src_pg->flags |= MDB_PG_FLAGS_STAR_EXCL;
316}
317
318static void __fwd_del_star_excl(struct net_bridge_port_group *pg,
319 struct br_ip *sg_ip)
320{
321 struct net_bridge_port_group_sg_key sg_key;
322 struct net_bridge *br = pg->key.port->br;
323 struct net_bridge_port_group *src_pg;
324
325 memset(&sg_key, 0, sizeof(sg_key));
326 sg_key.port = pg->key.port;
327 sg_key.addr = *sg_ip;
328 src_pg = br_sg_port_find(br, &sg_key);
329 if (!src_pg || !(src_pg->flags & MDB_PG_FLAGS_STAR_EXCL) ||
330 src_pg->rt_protocol != RTPROT_KERNEL)
331 return;
332
333 br_multicast_find_del_pg(br, src_pg);
334}
335
336/* When a port group transitions to (or is added as) EXCLUDE we need to add it
337 * to all other ports' S,G entries which are not blocked by the current group
338 * for proper replication, the assumption is that any S,G blocked entries
339 * are already added so the S,G,port lookup should skip them.
340 * When a port group transitions from EXCLUDE -> INCLUDE mode or is being
341 * deleted we need to remove it from all ports' S,G entries where it was
342 * automatically installed before (i.e. where it's MDB_PG_FLAGS_STAR_EXCL).
343 */
344void br_multicast_star_g_handle_mode(struct net_bridge_port_group *pg,
345 u8 filter_mode)
346{
347 struct net_bridge *br = pg->key.port->br;
348 struct net_bridge_port_group *pg_lst;
349 struct net_bridge_mcast_port *pmctx;
350 struct net_bridge_mdb_entry *mp;
351 struct br_ip sg_ip;
352
353 if (WARN_ON(!br_multicast_is_star_g(&pg->key.addr)))
354 return;
355
356 mp = br_mdb_ip_get(br, &pg->key.addr);
357 if (!mp)
358 return;
359 pmctx = br_multicast_pg_to_port_ctx(pg);
360 if (!pmctx)
361 return;
362
363 memset(&sg_ip, 0, sizeof(sg_ip));
364 sg_ip = pg->key.addr;
365
366 for (pg_lst = mlock_dereference(mp->ports, br);
367 pg_lst;
368 pg_lst = mlock_dereference(pg_lst->next, br)) {
369 struct net_bridge_group_src *src_ent;
370
371 if (pg_lst == pg)
372 continue;
373 hlist_for_each_entry(src_ent, &pg_lst->src_list, node) {
374 if (!(src_ent->flags & BR_SGRP_F_INSTALLED))
375 continue;
376 sg_ip.src = src_ent->addr.src;
377 switch (filter_mode) {
378 case MCAST_INCLUDE:
379 __fwd_del_star_excl(pg, &sg_ip);
380 break;
381 case MCAST_EXCLUDE:
382 __fwd_add_star_excl(pmctx, pg, &sg_ip);
383 break;
384 }
385 }
386 }
387}
388
389/* called when adding a new S,G with host_joined == false by default */
390static void br_multicast_sg_host_state(struct net_bridge_mdb_entry *star_mp,
391 struct net_bridge_port_group *sg)
392{
393 struct net_bridge_mdb_entry *sg_mp;
394
395 if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr)))
396 return;
397 if (!star_mp->host_joined)
398 return;
399
400 sg_mp = br_mdb_ip_get(star_mp->br, &sg->key.addr);
401 if (!sg_mp)
402 return;
403 sg_mp->host_joined = true;
404}
405
406/* set the host_joined state of all of *,G's S,G entries */
407static void br_multicast_star_g_host_state(struct net_bridge_mdb_entry *star_mp)
408{
409 struct net_bridge *br = star_mp->br;
410 struct net_bridge_mdb_entry *sg_mp;
411 struct net_bridge_port_group *pg;
412 struct br_ip sg_ip;
413
414 if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr)))
415 return;
416
417 memset(&sg_ip, 0, sizeof(sg_ip));
418 sg_ip = star_mp->addr;
419 for (pg = mlock_dereference(star_mp->ports, br);
420 pg;
421 pg = mlock_dereference(pg->next, br)) {
422 struct net_bridge_group_src *src_ent;
423
424 hlist_for_each_entry(src_ent, &pg->src_list, node) {
425 if (!(src_ent->flags & BR_SGRP_F_INSTALLED))
426 continue;
427 sg_ip.src = src_ent->addr.src;
428 sg_mp = br_mdb_ip_get(br, &sg_ip);
429 if (!sg_mp)
430 continue;
431 sg_mp->host_joined = star_mp->host_joined;
432 }
433 }
434}
435
436static void br_multicast_sg_del_exclude_ports(struct net_bridge_mdb_entry *sgmp)
437{
438 struct net_bridge_port_group __rcu **pp;
439 struct net_bridge_port_group *p;
440
441 /* *,G exclude ports are only added to S,G entries */
442 if (WARN_ON(br_multicast_is_star_g(&sgmp->addr)))
443 return;
444
445 /* we need the STAR_EXCLUDE ports if there are non-STAR_EXCLUDE ports
446 * we should ignore perm entries since they're managed by user-space
447 */
448 for (pp = &sgmp->ports;
449 (p = mlock_dereference(*pp, sgmp->br)) != NULL;
450 pp = &p->next)
451 if (!(p->flags & (MDB_PG_FLAGS_STAR_EXCL |
452 MDB_PG_FLAGS_PERMANENT)))
453 return;
454
455 /* currently the host can only have joined the *,G which means
456 * we treat it as EXCLUDE {}, so for an S,G it's considered a
457 * STAR_EXCLUDE entry and we can safely leave it
458 */
459 sgmp->host_joined = false;
460
461 for (pp = &sgmp->ports;
462 (p = mlock_dereference(*pp, sgmp->br)) != NULL;) {
463 if (!(p->flags & MDB_PG_FLAGS_PERMANENT))
464 br_multicast_del_pg(sgmp, p, pp);
465 else
466 pp = &p->next;
467 }
468}
469
470void br_multicast_sg_add_exclude_ports(struct net_bridge_mdb_entry *star_mp,
471 struct net_bridge_port_group *sg)
472{
473 struct net_bridge_port_group_sg_key sg_key;
474 struct net_bridge *br = star_mp->br;
475 struct net_bridge_mcast_port *pmctx;
476 struct net_bridge_port_group *pg;
477 struct net_bridge_mcast *brmctx;
478
479 if (WARN_ON(br_multicast_is_star_g(&sg->key.addr)))
480 return;
481 if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr)))
482 return;
483
484 br_multicast_sg_host_state(star_mp, sg);
485 memset(&sg_key, 0, sizeof(sg_key));
486 sg_key.addr = sg->key.addr;
487 /* we need to add all exclude ports to the S,G */
488 for (pg = mlock_dereference(star_mp->ports, br);
489 pg;
490 pg = mlock_dereference(pg->next, br)) {
491 struct net_bridge_port_group *src_pg;
492
493 if (pg == sg || pg->filter_mode == MCAST_INCLUDE)
494 continue;
495
496 sg_key.port = pg->key.port;
497 if (br_sg_port_find(br, &sg_key))
498 continue;
499
500 pmctx = br_multicast_pg_to_port_ctx(pg);
501 if (!pmctx)
502 continue;
503 brmctx = br_multicast_port_ctx_get_global(pmctx);
504
505 src_pg = __br_multicast_add_group(brmctx, pmctx,
506 &sg->key.addr,
507 sg->eth_addr,
508 MCAST_INCLUDE, false, false);
509 if (IS_ERR_OR_NULL(src_pg) ||
510 src_pg->rt_protocol != RTPROT_KERNEL)
511 continue;
512 src_pg->flags |= MDB_PG_FLAGS_STAR_EXCL;
513 }
514}
515
516static void br_multicast_fwd_src_add(struct net_bridge_group_src *src)
517{
518 struct net_bridge_mdb_entry *star_mp;
519 struct net_bridge_mcast_port *pmctx;
520 struct net_bridge_port_group *sg;
521 struct net_bridge_mcast *brmctx;
522 struct br_ip sg_ip;
523
524 if (src->flags & BR_SGRP_F_INSTALLED)
525 return;
526
527 memset(&sg_ip, 0, sizeof(sg_ip));
528 pmctx = br_multicast_pg_to_port_ctx(src->pg);
529 if (!pmctx)
530 return;
531 brmctx = br_multicast_port_ctx_get_global(pmctx);
532 sg_ip = src->pg->key.addr;
533 sg_ip.src = src->addr.src;
534
535 sg = __br_multicast_add_group(brmctx, pmctx, &sg_ip,
536 src->pg->eth_addr, MCAST_INCLUDE, false,
537 !timer_pending(&src->timer));
538 if (IS_ERR_OR_NULL(sg))
539 return;
540 src->flags |= BR_SGRP_F_INSTALLED;
541 sg->flags &= ~MDB_PG_FLAGS_STAR_EXCL;
542
543 /* if it was added by user-space as perm we can skip next steps */
544 if (sg->rt_protocol != RTPROT_KERNEL &&
545 (sg->flags & MDB_PG_FLAGS_PERMANENT))
546 return;
547
548 /* the kernel is now responsible for removing this S,G */
549 del_timer(&sg->timer);
550 star_mp = br_mdb_ip_get(src->br, &src->pg->key.addr);
551 if (!star_mp)
552 return;
553
554 br_multicast_sg_add_exclude_ports(star_mp, sg);
555}
556
557static void br_multicast_fwd_src_remove(struct net_bridge_group_src *src,
558 bool fastleave)
559{
560 struct net_bridge_port_group *p, *pg = src->pg;
561 struct net_bridge_port_group __rcu **pp;
562 struct net_bridge_mdb_entry *mp;
563 struct br_ip sg_ip;
564
565 memset(&sg_ip, 0, sizeof(sg_ip));
566 sg_ip = pg->key.addr;
567 sg_ip.src = src->addr.src;
568
569 mp = br_mdb_ip_get(src->br, &sg_ip);
570 if (!mp)
571 return;
572
573 for (pp = &mp->ports;
574 (p = mlock_dereference(*pp, src->br)) != NULL;
575 pp = &p->next) {
576 if (!br_port_group_equal(p, pg->key.port, pg->eth_addr))
577 continue;
578
579 if (p->rt_protocol != RTPROT_KERNEL &&
580 (p->flags & MDB_PG_FLAGS_PERMANENT) &&
581 !(src->flags & BR_SGRP_F_USER_ADDED))
582 break;
583
584 if (fastleave)
585 p->flags |= MDB_PG_FLAGS_FAST_LEAVE;
586 br_multicast_del_pg(mp, p, pp);
587 break;
588 }
589 src->flags &= ~BR_SGRP_F_INSTALLED;
590}
591
592/* install S,G and based on src's timer enable or disable forwarding */
593static void br_multicast_fwd_src_handle(struct net_bridge_group_src *src)
594{
595 struct net_bridge_port_group_sg_key sg_key;
596 struct net_bridge_port_group *sg;
597 u8 old_flags;
598
599 br_multicast_fwd_src_add(src);
600
601 memset(&sg_key, 0, sizeof(sg_key));
602 sg_key.addr = src->pg->key.addr;
603 sg_key.addr.src = src->addr.src;
604 sg_key.port = src->pg->key.port;
605
606 sg = br_sg_port_find(src->br, &sg_key);
607 if (!sg || (sg->flags & MDB_PG_FLAGS_PERMANENT))
608 return;
609
610 old_flags = sg->flags;
611 if (timer_pending(&src->timer))
612 sg->flags &= ~MDB_PG_FLAGS_BLOCKED;
613 else
614 sg->flags |= MDB_PG_FLAGS_BLOCKED;
615
616 if (old_flags != sg->flags) {
617 struct net_bridge_mdb_entry *sg_mp;
618
619 sg_mp = br_mdb_ip_get(src->br, &sg_key.addr);
620 if (!sg_mp)
621 return;
622 br_mdb_notify(src->br->dev, sg_mp, sg, RTM_NEWMDB);
623 }
624}
625
626static void br_multicast_destroy_mdb_entry(struct net_bridge_mcast_gc *gc)
627{
628 struct net_bridge_mdb_entry *mp;
629
630 mp = container_of(gc, struct net_bridge_mdb_entry, mcast_gc);
631 WARN_ON(!hlist_unhashed(&mp->mdb_node));
632 WARN_ON(mp->ports);
633
634 timer_shutdown_sync(&mp->timer);
635 kfree_rcu(mp, rcu);
636}
637
638static void br_multicast_del_mdb_entry(struct net_bridge_mdb_entry *mp)
639{
640 struct net_bridge *br = mp->br;
641
642 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
643 br_mdb_rht_params);
644 hlist_del_init_rcu(&mp->mdb_node);
645 hlist_add_head(&mp->mcast_gc.gc_node, &br->mcast_gc_list);
646 queue_work(system_long_wq, &br->mcast_gc_work);
647}
648
649static void br_multicast_group_expired(struct timer_list *t)
650{
651 struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer);
652 struct net_bridge *br = mp->br;
653
654 spin_lock(&br->multicast_lock);
655 if (hlist_unhashed(&mp->mdb_node) || !netif_running(br->dev) ||
656 timer_pending(&mp->timer))
657 goto out;
658
659 br_multicast_host_leave(mp, true);
660
661 if (mp->ports)
662 goto out;
663 br_multicast_del_mdb_entry(mp);
664out:
665 spin_unlock(&br->multicast_lock);
666}
667
668static void br_multicast_destroy_group_src(struct net_bridge_mcast_gc *gc)
669{
670 struct net_bridge_group_src *src;
671
672 src = container_of(gc, struct net_bridge_group_src, mcast_gc);
673 WARN_ON(!hlist_unhashed(&src->node));
674
675 timer_shutdown_sync(&src->timer);
676 kfree_rcu(src, rcu);
677}
678
679void __br_multicast_del_group_src(struct net_bridge_group_src *src)
680{
681 struct net_bridge *br = src->pg->key.port->br;
682
683 hlist_del_init_rcu(&src->node);
684 src->pg->src_ents--;
685 hlist_add_head(&src->mcast_gc.gc_node, &br->mcast_gc_list);
686 queue_work(system_long_wq, &br->mcast_gc_work);
687}
688
689void br_multicast_del_group_src(struct net_bridge_group_src *src,
690 bool fastleave)
691{
692 br_multicast_fwd_src_remove(src, fastleave);
693 __br_multicast_del_group_src(src);
694}
695
696static int
697br_multicast_port_ngroups_inc_one(struct net_bridge_mcast_port *pmctx,
698 struct netlink_ext_ack *extack,
699 const char *what)
700{
701 u32 max = READ_ONCE(pmctx->mdb_max_entries);
702 u32 n = READ_ONCE(pmctx->mdb_n_entries);
703
704 if (max && n >= max) {
705 NL_SET_ERR_MSG_FMT_MOD(extack, "%s is already in %u groups, and mcast_max_groups=%u",
706 what, n, max);
707 return -E2BIG;
708 }
709
710 WRITE_ONCE(pmctx->mdb_n_entries, n + 1);
711 return 0;
712}
713
714static void br_multicast_port_ngroups_dec_one(struct net_bridge_mcast_port *pmctx)
715{
716 u32 n = READ_ONCE(pmctx->mdb_n_entries);
717
718 WARN_ON_ONCE(n == 0);
719 WRITE_ONCE(pmctx->mdb_n_entries, n - 1);
720}
721
722static int br_multicast_port_ngroups_inc(struct net_bridge_port *port,
723 const struct br_ip *group,
724 struct netlink_ext_ack *extack)
725{
726 struct net_bridge_mcast_port *pmctx;
727 int err;
728
729 lockdep_assert_held_once(&port->br->multicast_lock);
730
731 /* Always count on the port context. */
732 err = br_multicast_port_ngroups_inc_one(&port->multicast_ctx, extack,
733 "Port");
734 if (err) {
735 trace_br_mdb_full(port->dev, group);
736 return err;
737 }
738
739 /* Only count on the VLAN context if VID is given, and if snooping on
740 * that VLAN is enabled.
741 */
742 if (!group->vid)
743 return 0;
744
745 pmctx = br_multicast_port_vid_to_port_ctx(port, group->vid);
746 if (!pmctx)
747 return 0;
748
749 err = br_multicast_port_ngroups_inc_one(pmctx, extack, "Port-VLAN");
750 if (err) {
751 trace_br_mdb_full(port->dev, group);
752 goto dec_one_out;
753 }
754
755 return 0;
756
757dec_one_out:
758 br_multicast_port_ngroups_dec_one(&port->multicast_ctx);
759 return err;
760}
761
762static void br_multicast_port_ngroups_dec(struct net_bridge_port *port, u16 vid)
763{
764 struct net_bridge_mcast_port *pmctx;
765
766 lockdep_assert_held_once(&port->br->multicast_lock);
767
768 if (vid) {
769 pmctx = br_multicast_port_vid_to_port_ctx(port, vid);
770 if (pmctx)
771 br_multicast_port_ngroups_dec_one(pmctx);
772 }
773 br_multicast_port_ngroups_dec_one(&port->multicast_ctx);
774}
775
776u32 br_multicast_ngroups_get(const struct net_bridge_mcast_port *pmctx)
777{
778 return READ_ONCE(pmctx->mdb_n_entries);
779}
780
781void br_multicast_ngroups_set_max(struct net_bridge_mcast_port *pmctx, u32 max)
782{
783 WRITE_ONCE(pmctx->mdb_max_entries, max);
784}
785
786u32 br_multicast_ngroups_get_max(const struct net_bridge_mcast_port *pmctx)
787{
788 return READ_ONCE(pmctx->mdb_max_entries);
789}
790
791static void br_multicast_destroy_port_group(struct net_bridge_mcast_gc *gc)
792{
793 struct net_bridge_port_group *pg;
794
795 pg = container_of(gc, struct net_bridge_port_group, mcast_gc);
796 WARN_ON(!hlist_unhashed(&pg->mglist));
797 WARN_ON(!hlist_empty(&pg->src_list));
798
799 timer_shutdown_sync(&pg->rexmit_timer);
800 timer_shutdown_sync(&pg->timer);
801 kfree_rcu(pg, rcu);
802}
803
804void br_multicast_del_pg(struct net_bridge_mdb_entry *mp,
805 struct net_bridge_port_group *pg,
806 struct net_bridge_port_group __rcu **pp)
807{
808 struct net_bridge *br = pg->key.port->br;
809 struct net_bridge_group_src *ent;
810 struct hlist_node *tmp;
811
812 rcu_assign_pointer(*pp, pg->next);
813 hlist_del_init(&pg->mglist);
814 br_multicast_eht_clean_sets(pg);
815 hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node)
816 br_multicast_del_group_src(ent, false);
817 br_mdb_notify(br->dev, mp, pg, RTM_DELMDB);
818 if (!br_multicast_is_star_g(&mp->addr)) {
819 rhashtable_remove_fast(&br->sg_port_tbl, &pg->rhnode,
820 br_sg_port_rht_params);
821 br_multicast_sg_del_exclude_ports(mp);
822 } else {
823 br_multicast_star_g_handle_mode(pg, MCAST_INCLUDE);
824 }
825 br_multicast_port_ngroups_dec(pg->key.port, pg->key.addr.vid);
826 hlist_add_head(&pg->mcast_gc.gc_node, &br->mcast_gc_list);
827 queue_work(system_long_wq, &br->mcast_gc_work);
828
829 if (!mp->ports && !mp->host_joined && netif_running(br->dev))
830 mod_timer(&mp->timer, jiffies);
831}
832
833static void br_multicast_find_del_pg(struct net_bridge *br,
834 struct net_bridge_port_group *pg)
835{
836 struct net_bridge_port_group __rcu **pp;
837 struct net_bridge_mdb_entry *mp;
838 struct net_bridge_port_group *p;
839
840 mp = br_mdb_ip_get(br, &pg->key.addr);
841 if (WARN_ON(!mp))
842 return;
843
844 for (pp = &mp->ports;
845 (p = mlock_dereference(*pp, br)) != NULL;
846 pp = &p->next) {
847 if (p != pg)
848 continue;
849
850 br_multicast_del_pg(mp, pg, pp);
851 return;
852 }
853
854 WARN_ON(1);
855}
856
857static void br_multicast_port_group_expired(struct timer_list *t)
858{
859 struct net_bridge_port_group *pg = from_timer(pg, t, timer);
860 struct net_bridge_group_src *src_ent;
861 struct net_bridge *br = pg->key.port->br;
862 struct hlist_node *tmp;
863 bool changed;
864
865 spin_lock(&br->multicast_lock);
866 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
867 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
868 goto out;
869
870 changed = !!(pg->filter_mode == MCAST_EXCLUDE);
871 pg->filter_mode = MCAST_INCLUDE;
872 hlist_for_each_entry_safe(src_ent, tmp, &pg->src_list, node) {
873 if (!timer_pending(&src_ent->timer)) {
874 br_multicast_del_group_src(src_ent, false);
875 changed = true;
876 }
877 }
878
879 if (hlist_empty(&pg->src_list)) {
880 br_multicast_find_del_pg(br, pg);
881 } else if (changed) {
882 struct net_bridge_mdb_entry *mp = br_mdb_ip_get(br, &pg->key.addr);
883
884 if (changed && br_multicast_is_star_g(&pg->key.addr))
885 br_multicast_star_g_handle_mode(pg, MCAST_INCLUDE);
886
887 if (WARN_ON(!mp))
888 goto out;
889 br_mdb_notify(br->dev, mp, pg, RTM_NEWMDB);
890 }
891out:
892 spin_unlock(&br->multicast_lock);
893}
894
895static void br_multicast_gc(struct hlist_head *head)
896{
897 struct net_bridge_mcast_gc *gcent;
898 struct hlist_node *tmp;
899
900 hlist_for_each_entry_safe(gcent, tmp, head, gc_node) {
901 hlist_del_init(&gcent->gc_node);
902 gcent->destroy(gcent);
903 }
904}
905
906static void __br_multicast_query_handle_vlan(struct net_bridge_mcast *brmctx,
907 struct net_bridge_mcast_port *pmctx,
908 struct sk_buff *skb)
909{
910 struct net_bridge_vlan *vlan = NULL;
911
912 if (pmctx && br_multicast_port_ctx_is_vlan(pmctx))
913 vlan = pmctx->vlan;
914 else if (br_multicast_ctx_is_vlan(brmctx))
915 vlan = brmctx->vlan;
916
917 if (vlan && !(vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED)) {
918 u16 vlan_proto;
919
920 if (br_vlan_get_proto(brmctx->br->dev, &vlan_proto) != 0)
921 return;
922 __vlan_hwaccel_put_tag(skb, htons(vlan_proto), vlan->vid);
923 }
924}
925
926static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge_mcast *brmctx,
927 struct net_bridge_mcast_port *pmctx,
928 struct net_bridge_port_group *pg,
929 __be32 ip_dst, __be32 group,
930 bool with_srcs, bool over_lmqt,
931 u8 sflag, u8 *igmp_type,
932 bool *need_rexmit)
933{
934 struct net_bridge_port *p = pg ? pg->key.port : NULL;
935 struct net_bridge_group_src *ent;
936 size_t pkt_size, igmp_hdr_size;
937 unsigned long now = jiffies;
938 struct igmpv3_query *ihv3;
939 void *csum_start = NULL;
940 __sum16 *csum = NULL;
941 struct sk_buff *skb;
942 struct igmphdr *ih;
943 struct ethhdr *eth;
944 unsigned long lmqt;
945 struct iphdr *iph;
946 u16 lmqt_srcs = 0;
947
948 igmp_hdr_size = sizeof(*ih);
949 if (brmctx->multicast_igmp_version == 3) {
950 igmp_hdr_size = sizeof(*ihv3);
951 if (pg && with_srcs) {
952 lmqt = now + (brmctx->multicast_last_member_interval *
953 brmctx->multicast_last_member_count);
954 hlist_for_each_entry(ent, &pg->src_list, node) {
955 if (over_lmqt == time_after(ent->timer.expires,
956 lmqt) &&
957 ent->src_query_rexmit_cnt > 0)
958 lmqt_srcs++;
959 }
960
961 if (!lmqt_srcs)
962 return NULL;
963 igmp_hdr_size += lmqt_srcs * sizeof(__be32);
964 }
965 }
966
967 pkt_size = sizeof(*eth) + sizeof(*iph) + 4 + igmp_hdr_size;
968 if ((p && pkt_size > p->dev->mtu) ||
969 pkt_size > brmctx->br->dev->mtu)
970 return NULL;
971
972 skb = netdev_alloc_skb_ip_align(brmctx->br->dev, pkt_size);
973 if (!skb)
974 goto out;
975
976 __br_multicast_query_handle_vlan(brmctx, pmctx, skb);
977 skb->protocol = htons(ETH_P_IP);
978
979 skb_reset_mac_header(skb);
980 eth = eth_hdr(skb);
981
982 ether_addr_copy(eth->h_source, brmctx->br->dev->dev_addr);
983 ip_eth_mc_map(ip_dst, eth->h_dest);
984 eth->h_proto = htons(ETH_P_IP);
985 skb_put(skb, sizeof(*eth));
986
987 skb_set_network_header(skb, skb->len);
988 iph = ip_hdr(skb);
989 iph->tot_len = htons(pkt_size - sizeof(*eth));
990
991 iph->version = 4;
992 iph->ihl = 6;
993 iph->tos = 0xc0;
994 iph->id = 0;
995 iph->frag_off = htons(IP_DF);
996 iph->ttl = 1;
997 iph->protocol = IPPROTO_IGMP;
998 iph->saddr = br_opt_get(brmctx->br, BROPT_MULTICAST_QUERY_USE_IFADDR) ?
999 inet_select_addr(brmctx->br->dev, 0, RT_SCOPE_LINK) : 0;
1000 iph->daddr = ip_dst;
1001 ((u8 *)&iph[1])[0] = IPOPT_RA;
1002 ((u8 *)&iph[1])[1] = 4;
1003 ((u8 *)&iph[1])[2] = 0;
1004 ((u8 *)&iph[1])[3] = 0;
1005 ip_send_check(iph);
1006 skb_put(skb, 24);
1007
1008 skb_set_transport_header(skb, skb->len);
1009 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
1010
1011 switch (brmctx->multicast_igmp_version) {
1012 case 2:
1013 ih = igmp_hdr(skb);
1014 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
1015 ih->code = (group ? brmctx->multicast_last_member_interval :
1016 brmctx->multicast_query_response_interval) /
1017 (HZ / IGMP_TIMER_SCALE);
1018 ih->group = group;
1019 ih->csum = 0;
1020 csum = &ih->csum;
1021 csum_start = (void *)ih;
1022 break;
1023 case 3:
1024 ihv3 = igmpv3_query_hdr(skb);
1025 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
1026 ihv3->code = (group ? brmctx->multicast_last_member_interval :
1027 brmctx->multicast_query_response_interval) /
1028 (HZ / IGMP_TIMER_SCALE);
1029 ihv3->group = group;
1030 ihv3->qqic = brmctx->multicast_query_interval / HZ;
1031 ihv3->nsrcs = htons(lmqt_srcs);
1032 ihv3->resv = 0;
1033 ihv3->suppress = sflag;
1034 ihv3->qrv = 2;
1035 ihv3->csum = 0;
1036 csum = &ihv3->csum;
1037 csum_start = (void *)ihv3;
1038 if (!pg || !with_srcs)
1039 break;
1040
1041 lmqt_srcs = 0;
1042 hlist_for_each_entry(ent, &pg->src_list, node) {
1043 if (over_lmqt == time_after(ent->timer.expires,
1044 lmqt) &&
1045 ent->src_query_rexmit_cnt > 0) {
1046 ihv3->srcs[lmqt_srcs++] = ent->addr.src.ip4;
1047 ent->src_query_rexmit_cnt--;
1048 if (need_rexmit && ent->src_query_rexmit_cnt)
1049 *need_rexmit = true;
1050 }
1051 }
1052 if (WARN_ON(lmqt_srcs != ntohs(ihv3->nsrcs))) {
1053 kfree_skb(skb);
1054 return NULL;
1055 }
1056 break;
1057 }
1058
1059 if (WARN_ON(!csum || !csum_start)) {
1060 kfree_skb(skb);
1061 return NULL;
1062 }
1063
1064 *csum = ip_compute_csum(csum_start, igmp_hdr_size);
1065 skb_put(skb, igmp_hdr_size);
1066 __skb_pull(skb, sizeof(*eth));
1067
1068out:
1069 return skb;
1070}
1071
1072#if IS_ENABLED(CONFIG_IPV6)
1073static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge_mcast *brmctx,
1074 struct net_bridge_mcast_port *pmctx,
1075 struct net_bridge_port_group *pg,
1076 const struct in6_addr *ip6_dst,
1077 const struct in6_addr *group,
1078 bool with_srcs, bool over_llqt,
1079 u8 sflag, u8 *igmp_type,
1080 bool *need_rexmit)
1081{
1082 struct net_bridge_port *p = pg ? pg->key.port : NULL;
1083 struct net_bridge_group_src *ent;
1084 size_t pkt_size, mld_hdr_size;
1085 unsigned long now = jiffies;
1086 struct mld2_query *mld2q;
1087 void *csum_start = NULL;
1088 unsigned long interval;
1089 __sum16 *csum = NULL;
1090 struct ipv6hdr *ip6h;
1091 struct mld_msg *mldq;
1092 struct sk_buff *skb;
1093 unsigned long llqt;
1094 struct ethhdr *eth;
1095 u16 llqt_srcs = 0;
1096 u8 *hopopt;
1097
1098 mld_hdr_size = sizeof(*mldq);
1099 if (brmctx->multicast_mld_version == 2) {
1100 mld_hdr_size = sizeof(*mld2q);
1101 if (pg && with_srcs) {
1102 llqt = now + (brmctx->multicast_last_member_interval *
1103 brmctx->multicast_last_member_count);
1104 hlist_for_each_entry(ent, &pg->src_list, node) {
1105 if (over_llqt == time_after(ent->timer.expires,
1106 llqt) &&
1107 ent->src_query_rexmit_cnt > 0)
1108 llqt_srcs++;
1109 }
1110
1111 if (!llqt_srcs)
1112 return NULL;
1113 mld_hdr_size += llqt_srcs * sizeof(struct in6_addr);
1114 }
1115 }
1116
1117 pkt_size = sizeof(*eth) + sizeof(*ip6h) + 8 + mld_hdr_size;
1118 if ((p && pkt_size > p->dev->mtu) ||
1119 pkt_size > brmctx->br->dev->mtu)
1120 return NULL;
1121
1122 skb = netdev_alloc_skb_ip_align(brmctx->br->dev, pkt_size);
1123 if (!skb)
1124 goto out;
1125
1126 __br_multicast_query_handle_vlan(brmctx, pmctx, skb);
1127 skb->protocol = htons(ETH_P_IPV6);
1128
1129 /* Ethernet header */
1130 skb_reset_mac_header(skb);
1131 eth = eth_hdr(skb);
1132
1133 ether_addr_copy(eth->h_source, brmctx->br->dev->dev_addr);
1134 eth->h_proto = htons(ETH_P_IPV6);
1135 skb_put(skb, sizeof(*eth));
1136
1137 /* IPv6 header + HbH option */
1138 skb_set_network_header(skb, skb->len);
1139 ip6h = ipv6_hdr(skb);
1140
1141 *(__force __be32 *)ip6h = htonl(0x60000000);
1142 ip6h->payload_len = htons(8 + mld_hdr_size);
1143 ip6h->nexthdr = IPPROTO_HOPOPTS;
1144 ip6h->hop_limit = 1;
1145 ip6h->daddr = *ip6_dst;
1146 if (ipv6_dev_get_saddr(dev_net(brmctx->br->dev), brmctx->br->dev,
1147 &ip6h->daddr, 0, &ip6h->saddr)) {
1148 kfree_skb(skb);
1149 br_opt_toggle(brmctx->br, BROPT_HAS_IPV6_ADDR, false);
1150 return NULL;
1151 }
1152
1153 br_opt_toggle(brmctx->br, BROPT_HAS_IPV6_ADDR, true);
1154 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
1155
1156 hopopt = (u8 *)(ip6h + 1);
1157 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
1158 hopopt[1] = 0; /* length of HbH */
1159 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
1160 hopopt[3] = 2; /* Length of RA Option */
1161 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
1162 hopopt[5] = 0;
1163 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
1164 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
1165
1166 skb_put(skb, sizeof(*ip6h) + 8);
1167
1168 /* ICMPv6 */
1169 skb_set_transport_header(skb, skb->len);
1170 interval = ipv6_addr_any(group) ?
1171 brmctx->multicast_query_response_interval :
1172 brmctx->multicast_last_member_interval;
1173 *igmp_type = ICMPV6_MGM_QUERY;
1174 switch (brmctx->multicast_mld_version) {
1175 case 1:
1176 mldq = (struct mld_msg *)icmp6_hdr(skb);
1177 mldq->mld_type = ICMPV6_MGM_QUERY;
1178 mldq->mld_code = 0;
1179 mldq->mld_cksum = 0;
1180 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
1181 mldq->mld_reserved = 0;
1182 mldq->mld_mca = *group;
1183 csum = &mldq->mld_cksum;
1184 csum_start = (void *)mldq;
1185 break;
1186 case 2:
1187 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1188 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
1189 mld2q->mld2q_type = ICMPV6_MGM_QUERY;
1190 mld2q->mld2q_code = 0;
1191 mld2q->mld2q_cksum = 0;
1192 mld2q->mld2q_resv1 = 0;
1193 mld2q->mld2q_resv2 = 0;
1194 mld2q->mld2q_suppress = sflag;
1195 mld2q->mld2q_qrv = 2;
1196 mld2q->mld2q_nsrcs = htons(llqt_srcs);
1197 mld2q->mld2q_qqic = brmctx->multicast_query_interval / HZ;
1198 mld2q->mld2q_mca = *group;
1199 csum = &mld2q->mld2q_cksum;
1200 csum_start = (void *)mld2q;
1201 if (!pg || !with_srcs)
1202 break;
1203
1204 llqt_srcs = 0;
1205 hlist_for_each_entry(ent, &pg->src_list, node) {
1206 if (over_llqt == time_after(ent->timer.expires,
1207 llqt) &&
1208 ent->src_query_rexmit_cnt > 0) {
1209 mld2q->mld2q_srcs[llqt_srcs++] = ent->addr.src.ip6;
1210 ent->src_query_rexmit_cnt--;
1211 if (need_rexmit && ent->src_query_rexmit_cnt)
1212 *need_rexmit = true;
1213 }
1214 }
1215 if (WARN_ON(llqt_srcs != ntohs(mld2q->mld2q_nsrcs))) {
1216 kfree_skb(skb);
1217 return NULL;
1218 }
1219 break;
1220 }
1221
1222 if (WARN_ON(!csum || !csum_start)) {
1223 kfree_skb(skb);
1224 return NULL;
1225 }
1226
1227 *csum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, mld_hdr_size,
1228 IPPROTO_ICMPV6,
1229 csum_partial(csum_start, mld_hdr_size, 0));
1230 skb_put(skb, mld_hdr_size);
1231 __skb_pull(skb, sizeof(*eth));
1232
1233out:
1234 return skb;
1235}
1236#endif
1237
1238static struct sk_buff *br_multicast_alloc_query(struct net_bridge_mcast *brmctx,
1239 struct net_bridge_mcast_port *pmctx,
1240 struct net_bridge_port_group *pg,
1241 struct br_ip *ip_dst,
1242 struct br_ip *group,
1243 bool with_srcs, bool over_lmqt,
1244 u8 sflag, u8 *igmp_type,
1245 bool *need_rexmit)
1246{
1247 __be32 ip4_dst;
1248
1249 switch (group->proto) {
1250 case htons(ETH_P_IP):
1251 ip4_dst = ip_dst ? ip_dst->dst.ip4 : htonl(INADDR_ALLHOSTS_GROUP);
1252 return br_ip4_multicast_alloc_query(brmctx, pmctx, pg,
1253 ip4_dst, group->dst.ip4,
1254 with_srcs, over_lmqt,
1255 sflag, igmp_type,
1256 need_rexmit);
1257#if IS_ENABLED(CONFIG_IPV6)
1258 case htons(ETH_P_IPV6): {
1259 struct in6_addr ip6_dst;
1260
1261 if (ip_dst)
1262 ip6_dst = ip_dst->dst.ip6;
1263 else
1264 ipv6_addr_set(&ip6_dst, htonl(0xff020000), 0, 0,
1265 htonl(1));
1266
1267 return br_ip6_multicast_alloc_query(brmctx, pmctx, pg,
1268 &ip6_dst, &group->dst.ip6,
1269 with_srcs, over_lmqt,
1270 sflag, igmp_type,
1271 need_rexmit);
1272 }
1273#endif
1274 }
1275 return NULL;
1276}
1277
1278struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
1279 struct br_ip *group)
1280{
1281 struct net_bridge_mdb_entry *mp;
1282 int err;
1283
1284 mp = br_mdb_ip_get(br, group);
1285 if (mp)
1286 return mp;
1287
1288 if (atomic_read(&br->mdb_hash_tbl.nelems) >= br->hash_max) {
1289 trace_br_mdb_full(br->dev, group);
1290 br_mc_disabled_update(br->dev, false, NULL);
1291 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false);
1292 return ERR_PTR(-E2BIG);
1293 }
1294
1295 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
1296 if (unlikely(!mp))
1297 return ERR_PTR(-ENOMEM);
1298
1299 mp->br = br;
1300 mp->addr = *group;
1301 mp->mcast_gc.destroy = br_multicast_destroy_mdb_entry;
1302 timer_setup(&mp->timer, br_multicast_group_expired, 0);
1303 err = rhashtable_lookup_insert_fast(&br->mdb_hash_tbl, &mp->rhnode,
1304 br_mdb_rht_params);
1305 if (err) {
1306 kfree(mp);
1307 mp = ERR_PTR(err);
1308 } else {
1309 hlist_add_head_rcu(&mp->mdb_node, &br->mdb_list);
1310 }
1311
1312 return mp;
1313}
1314
1315static void br_multicast_group_src_expired(struct timer_list *t)
1316{
1317 struct net_bridge_group_src *src = from_timer(src, t, timer);
1318 struct net_bridge_port_group *pg;
1319 struct net_bridge *br = src->br;
1320
1321 spin_lock(&br->multicast_lock);
1322 if (hlist_unhashed(&src->node) || !netif_running(br->dev) ||
1323 timer_pending(&src->timer))
1324 goto out;
1325
1326 pg = src->pg;
1327 if (pg->filter_mode == MCAST_INCLUDE) {
1328 br_multicast_del_group_src(src, false);
1329 if (!hlist_empty(&pg->src_list))
1330 goto out;
1331 br_multicast_find_del_pg(br, pg);
1332 } else {
1333 br_multicast_fwd_src_handle(src);
1334 }
1335
1336out:
1337 spin_unlock(&br->multicast_lock);
1338}
1339
1340struct net_bridge_group_src *
1341br_multicast_find_group_src(struct net_bridge_port_group *pg, struct br_ip *ip)
1342{
1343 struct net_bridge_group_src *ent;
1344
1345 switch (ip->proto) {
1346 case htons(ETH_P_IP):
1347 hlist_for_each_entry(ent, &pg->src_list, node)
1348 if (ip->src.ip4 == ent->addr.src.ip4)
1349 return ent;
1350 break;
1351#if IS_ENABLED(CONFIG_IPV6)
1352 case htons(ETH_P_IPV6):
1353 hlist_for_each_entry(ent, &pg->src_list, node)
1354 if (!ipv6_addr_cmp(&ent->addr.src.ip6, &ip->src.ip6))
1355 return ent;
1356 break;
1357#endif
1358 }
1359
1360 return NULL;
1361}
1362
1363struct net_bridge_group_src *
1364br_multicast_new_group_src(struct net_bridge_port_group *pg, struct br_ip *src_ip)
1365{
1366 struct net_bridge_group_src *grp_src;
1367
1368 if (unlikely(pg->src_ents >= PG_SRC_ENT_LIMIT))
1369 return NULL;
1370
1371 switch (src_ip->proto) {
1372 case htons(ETH_P_IP):
1373 if (ipv4_is_zeronet(src_ip->src.ip4) ||
1374 ipv4_is_multicast(src_ip->src.ip4))
1375 return NULL;
1376 break;
1377#if IS_ENABLED(CONFIG_IPV6)
1378 case htons(ETH_P_IPV6):
1379 if (ipv6_addr_any(&src_ip->src.ip6) ||
1380 ipv6_addr_is_multicast(&src_ip->src.ip6))
1381 return NULL;
1382 break;
1383#endif
1384 }
1385
1386 grp_src = kzalloc(sizeof(*grp_src), GFP_ATOMIC);
1387 if (unlikely(!grp_src))
1388 return NULL;
1389
1390 grp_src->pg = pg;
1391 grp_src->br = pg->key.port->br;
1392 grp_src->addr = *src_ip;
1393 grp_src->mcast_gc.destroy = br_multicast_destroy_group_src;
1394 timer_setup(&grp_src->timer, br_multicast_group_src_expired, 0);
1395
1396 hlist_add_head_rcu(&grp_src->node, &pg->src_list);
1397 pg->src_ents++;
1398
1399 return grp_src;
1400}
1401
1402struct net_bridge_port_group *br_multicast_new_port_group(
1403 struct net_bridge_port *port,
1404 const struct br_ip *group,
1405 struct net_bridge_port_group __rcu *next,
1406 unsigned char flags,
1407 const unsigned char *src,
1408 u8 filter_mode,
1409 u8 rt_protocol,
1410 struct netlink_ext_ack *extack)
1411{
1412 struct net_bridge_port_group *p;
1413 int err;
1414
1415 err = br_multicast_port_ngroups_inc(port, group, extack);
1416 if (err)
1417 return NULL;
1418
1419 p = kzalloc(sizeof(*p), GFP_ATOMIC);
1420 if (unlikely(!p)) {
1421 NL_SET_ERR_MSG_MOD(extack, "Couldn't allocate new port group");
1422 goto dec_out;
1423 }
1424
1425 p->key.addr = *group;
1426 p->key.port = port;
1427 p->flags = flags;
1428 p->filter_mode = filter_mode;
1429 p->rt_protocol = rt_protocol;
1430 p->eht_host_tree = RB_ROOT;
1431 p->eht_set_tree = RB_ROOT;
1432 p->mcast_gc.destroy = br_multicast_destroy_port_group;
1433 INIT_HLIST_HEAD(&p->src_list);
1434
1435 if (!br_multicast_is_star_g(group) &&
1436 rhashtable_lookup_insert_fast(&port->br->sg_port_tbl, &p->rhnode,
1437 br_sg_port_rht_params)) {
1438 NL_SET_ERR_MSG_MOD(extack, "Couldn't insert new port group");
1439 goto free_out;
1440 }
1441
1442 rcu_assign_pointer(p->next, next);
1443 timer_setup(&p->timer, br_multicast_port_group_expired, 0);
1444 timer_setup(&p->rexmit_timer, br_multicast_port_group_rexmit, 0);
1445 hlist_add_head(&p->mglist, &port->mglist);
1446
1447 if (src)
1448 memcpy(p->eth_addr, src, ETH_ALEN);
1449 else
1450 eth_broadcast_addr(p->eth_addr);
1451
1452 return p;
1453
1454free_out:
1455 kfree(p);
1456dec_out:
1457 br_multicast_port_ngroups_dec(port, group->vid);
1458 return NULL;
1459}
1460
1461void br_multicast_del_port_group(struct net_bridge_port_group *p)
1462{
1463 struct net_bridge_port *port = p->key.port;
1464 __u16 vid = p->key.addr.vid;
1465
1466 hlist_del_init(&p->mglist);
1467 if (!br_multicast_is_star_g(&p->key.addr))
1468 rhashtable_remove_fast(&port->br->sg_port_tbl, &p->rhnode,
1469 br_sg_port_rht_params);
1470 kfree(p);
1471 br_multicast_port_ngroups_dec(port, vid);
1472}
1473
1474void br_multicast_host_join(const struct net_bridge_mcast *brmctx,
1475 struct net_bridge_mdb_entry *mp, bool notify)
1476{
1477 if (!mp->host_joined) {
1478 mp->host_joined = true;
1479 if (br_multicast_is_star_g(&mp->addr))
1480 br_multicast_star_g_host_state(mp);
1481 if (notify)
1482 br_mdb_notify(mp->br->dev, mp, NULL, RTM_NEWMDB);
1483 }
1484
1485 if (br_group_is_l2(&mp->addr))
1486 return;
1487
1488 mod_timer(&mp->timer, jiffies + brmctx->multicast_membership_interval);
1489}
1490
1491void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify)
1492{
1493 if (!mp->host_joined)
1494 return;
1495
1496 mp->host_joined = false;
1497 if (br_multicast_is_star_g(&mp->addr))
1498 br_multicast_star_g_host_state(mp);
1499 if (notify)
1500 br_mdb_notify(mp->br->dev, mp, NULL, RTM_DELMDB);
1501}
1502
1503static struct net_bridge_port_group *
1504__br_multicast_add_group(struct net_bridge_mcast *brmctx,
1505 struct net_bridge_mcast_port *pmctx,
1506 struct br_ip *group,
1507 const unsigned char *src,
1508 u8 filter_mode,
1509 bool igmpv2_mldv1,
1510 bool blocked)
1511{
1512 struct net_bridge_port_group __rcu **pp;
1513 struct net_bridge_port_group *p = NULL;
1514 struct net_bridge_mdb_entry *mp;
1515 unsigned long now = jiffies;
1516
1517 if (!br_multicast_ctx_should_use(brmctx, pmctx))
1518 goto out;
1519
1520 mp = br_multicast_new_group(brmctx->br, group);
1521 if (IS_ERR(mp))
1522 return ERR_CAST(mp);
1523
1524 if (!pmctx) {
1525 br_multicast_host_join(brmctx, mp, true);
1526 goto out;
1527 }
1528
1529 for (pp = &mp->ports;
1530 (p = mlock_dereference(*pp, brmctx->br)) != NULL;
1531 pp = &p->next) {
1532 if (br_port_group_equal(p, pmctx->port, src))
1533 goto found;
1534 if ((unsigned long)p->key.port < (unsigned long)pmctx->port)
1535 break;
1536 }
1537
1538 p = br_multicast_new_port_group(pmctx->port, group, *pp, 0, src,
1539 filter_mode, RTPROT_KERNEL, NULL);
1540 if (unlikely(!p)) {
1541 p = ERR_PTR(-ENOMEM);
1542 goto out;
1543 }
1544 rcu_assign_pointer(*pp, p);
1545 if (blocked)
1546 p->flags |= MDB_PG_FLAGS_BLOCKED;
1547 br_mdb_notify(brmctx->br->dev, mp, p, RTM_NEWMDB);
1548
1549found:
1550 if (igmpv2_mldv1)
1551 mod_timer(&p->timer,
1552 now + brmctx->multicast_membership_interval);
1553
1554out:
1555 return p;
1556}
1557
1558static int br_multicast_add_group(struct net_bridge_mcast *brmctx,
1559 struct net_bridge_mcast_port *pmctx,
1560 struct br_ip *group,
1561 const unsigned char *src,
1562 u8 filter_mode,
1563 bool igmpv2_mldv1)
1564{
1565 struct net_bridge_port_group *pg;
1566 int err;
1567
1568 spin_lock(&brmctx->br->multicast_lock);
1569 pg = __br_multicast_add_group(brmctx, pmctx, group, src, filter_mode,
1570 igmpv2_mldv1, false);
1571 /* NULL is considered valid for host joined groups */
1572 err = PTR_ERR_OR_ZERO(pg);
1573 spin_unlock(&brmctx->br->multicast_lock);
1574
1575 return err;
1576}
1577
1578static int br_ip4_multicast_add_group(struct net_bridge_mcast *brmctx,
1579 struct net_bridge_mcast_port *pmctx,
1580 __be32 group,
1581 __u16 vid,
1582 const unsigned char *src,
1583 bool igmpv2)
1584{
1585 struct br_ip br_group;
1586 u8 filter_mode;
1587
1588 if (ipv4_is_local_multicast(group))
1589 return 0;
1590
1591 memset(&br_group, 0, sizeof(br_group));
1592 br_group.dst.ip4 = group;
1593 br_group.proto = htons(ETH_P_IP);
1594 br_group.vid = vid;
1595 filter_mode = igmpv2 ? MCAST_EXCLUDE : MCAST_INCLUDE;
1596
1597 return br_multicast_add_group(brmctx, pmctx, &br_group, src,
1598 filter_mode, igmpv2);
1599}
1600
1601#if IS_ENABLED(CONFIG_IPV6)
1602static int br_ip6_multicast_add_group(struct net_bridge_mcast *brmctx,
1603 struct net_bridge_mcast_port *pmctx,
1604 const struct in6_addr *group,
1605 __u16 vid,
1606 const unsigned char *src,
1607 bool mldv1)
1608{
1609 struct br_ip br_group;
1610 u8 filter_mode;
1611
1612 if (ipv6_addr_is_ll_all_nodes(group))
1613 return 0;
1614
1615 memset(&br_group, 0, sizeof(br_group));
1616 br_group.dst.ip6 = *group;
1617 br_group.proto = htons(ETH_P_IPV6);
1618 br_group.vid = vid;
1619 filter_mode = mldv1 ? MCAST_EXCLUDE : MCAST_INCLUDE;
1620
1621 return br_multicast_add_group(brmctx, pmctx, &br_group, src,
1622 filter_mode, mldv1);
1623}
1624#endif
1625
1626static bool br_multicast_rport_del(struct hlist_node *rlist)
1627{
1628 if (hlist_unhashed(rlist))
1629 return false;
1630
1631 hlist_del_init_rcu(rlist);
1632 return true;
1633}
1634
1635static bool br_ip4_multicast_rport_del(struct net_bridge_mcast_port *pmctx)
1636{
1637 return br_multicast_rport_del(&pmctx->ip4_rlist);
1638}
1639
1640static bool br_ip6_multicast_rport_del(struct net_bridge_mcast_port *pmctx)
1641{
1642#if IS_ENABLED(CONFIG_IPV6)
1643 return br_multicast_rport_del(&pmctx->ip6_rlist);
1644#else
1645 return false;
1646#endif
1647}
1648
1649static void br_multicast_router_expired(struct net_bridge_mcast_port *pmctx,
1650 struct timer_list *t,
1651 struct hlist_node *rlist)
1652{
1653 struct net_bridge *br = pmctx->port->br;
1654 bool del;
1655
1656 spin_lock(&br->multicast_lock);
1657 if (pmctx->multicast_router == MDB_RTR_TYPE_DISABLED ||
1658 pmctx->multicast_router == MDB_RTR_TYPE_PERM ||
1659 timer_pending(t))
1660 goto out;
1661
1662 del = br_multicast_rport_del(rlist);
1663 br_multicast_rport_del_notify(pmctx, del);
1664out:
1665 spin_unlock(&br->multicast_lock);
1666}
1667
1668static void br_ip4_multicast_router_expired(struct timer_list *t)
1669{
1670 struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t,
1671 ip4_mc_router_timer);
1672
1673 br_multicast_router_expired(pmctx, t, &pmctx->ip4_rlist);
1674}
1675
1676#if IS_ENABLED(CONFIG_IPV6)
1677static void br_ip6_multicast_router_expired(struct timer_list *t)
1678{
1679 struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t,
1680 ip6_mc_router_timer);
1681
1682 br_multicast_router_expired(pmctx, t, &pmctx->ip6_rlist);
1683}
1684#endif
1685
1686static void br_mc_router_state_change(struct net_bridge *p,
1687 bool is_mc_router)
1688{
1689 struct switchdev_attr attr = {
1690 .orig_dev = p->dev,
1691 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
1692 .flags = SWITCHDEV_F_DEFER,
1693 .u.mrouter = is_mc_router,
1694 };
1695
1696 switchdev_port_attr_set(p->dev, &attr, NULL);
1697}
1698
1699static void br_multicast_local_router_expired(struct net_bridge_mcast *brmctx,
1700 struct timer_list *timer)
1701{
1702 spin_lock(&brmctx->br->multicast_lock);
1703 if (brmctx->multicast_router == MDB_RTR_TYPE_DISABLED ||
1704 brmctx->multicast_router == MDB_RTR_TYPE_PERM ||
1705 br_ip4_multicast_is_router(brmctx) ||
1706 br_ip6_multicast_is_router(brmctx))
1707 goto out;
1708
1709 br_mc_router_state_change(brmctx->br, false);
1710out:
1711 spin_unlock(&brmctx->br->multicast_lock);
1712}
1713
1714static void br_ip4_multicast_local_router_expired(struct timer_list *t)
1715{
1716 struct net_bridge_mcast *brmctx = from_timer(brmctx, t,
1717 ip4_mc_router_timer);
1718
1719 br_multicast_local_router_expired(brmctx, t);
1720}
1721
1722#if IS_ENABLED(CONFIG_IPV6)
1723static void br_ip6_multicast_local_router_expired(struct timer_list *t)
1724{
1725 struct net_bridge_mcast *brmctx = from_timer(brmctx, t,
1726 ip6_mc_router_timer);
1727
1728 br_multicast_local_router_expired(brmctx, t);
1729}
1730#endif
1731
1732static void br_multicast_querier_expired(struct net_bridge_mcast *brmctx,
1733 struct bridge_mcast_own_query *query)
1734{
1735 spin_lock(&brmctx->br->multicast_lock);
1736 if (!netif_running(brmctx->br->dev) ||
1737 br_multicast_ctx_vlan_global_disabled(brmctx) ||
1738 !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED))
1739 goto out;
1740
1741 br_multicast_start_querier(brmctx, query);
1742
1743out:
1744 spin_unlock(&brmctx->br->multicast_lock);
1745}
1746
1747static void br_ip4_multicast_querier_expired(struct timer_list *t)
1748{
1749 struct net_bridge_mcast *brmctx = from_timer(brmctx, t,
1750 ip4_other_query.timer);
1751
1752 br_multicast_querier_expired(brmctx, &brmctx->ip4_own_query);
1753}
1754
1755#if IS_ENABLED(CONFIG_IPV6)
1756static void br_ip6_multicast_querier_expired(struct timer_list *t)
1757{
1758 struct net_bridge_mcast *brmctx = from_timer(brmctx, t,
1759 ip6_other_query.timer);
1760
1761 br_multicast_querier_expired(brmctx, &brmctx->ip6_own_query);
1762}
1763#endif
1764
1765static void br_multicast_query_delay_expired(struct timer_list *t)
1766{
1767}
1768
1769static void br_multicast_select_own_querier(struct net_bridge_mcast *brmctx,
1770 struct br_ip *ip,
1771 struct sk_buff *skb)
1772{
1773 if (ip->proto == htons(ETH_P_IP))
1774 brmctx->ip4_querier.addr.src.ip4 = ip_hdr(skb)->saddr;
1775#if IS_ENABLED(CONFIG_IPV6)
1776 else
1777 brmctx->ip6_querier.addr.src.ip6 = ipv6_hdr(skb)->saddr;
1778#endif
1779}
1780
1781static void __br_multicast_send_query(struct net_bridge_mcast *brmctx,
1782 struct net_bridge_mcast_port *pmctx,
1783 struct net_bridge_port_group *pg,
1784 struct br_ip *ip_dst,
1785 struct br_ip *group,
1786 bool with_srcs,
1787 u8 sflag,
1788 bool *need_rexmit)
1789{
1790 bool over_lmqt = !!sflag;
1791 struct sk_buff *skb;
1792 u8 igmp_type;
1793
1794 if (!br_multicast_ctx_should_use(brmctx, pmctx) ||
1795 !br_multicast_ctx_matches_vlan_snooping(brmctx))
1796 return;
1797
1798again_under_lmqt:
1799 skb = br_multicast_alloc_query(brmctx, pmctx, pg, ip_dst, group,
1800 with_srcs, over_lmqt, sflag, &igmp_type,
1801 need_rexmit);
1802 if (!skb)
1803 return;
1804
1805 if (pmctx) {
1806 skb->dev = pmctx->port->dev;
1807 br_multicast_count(brmctx->br, pmctx->port, skb, igmp_type,
1808 BR_MCAST_DIR_TX);
1809 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
1810 dev_net(pmctx->port->dev), NULL, skb, NULL, skb->dev,
1811 br_dev_queue_push_xmit);
1812
1813 if (over_lmqt && with_srcs && sflag) {
1814 over_lmqt = false;
1815 goto again_under_lmqt;
1816 }
1817 } else {
1818 br_multicast_select_own_querier(brmctx, group, skb);
1819 br_multicast_count(brmctx->br, NULL, skb, igmp_type,
1820 BR_MCAST_DIR_RX);
1821 netif_rx(skb);
1822 }
1823}
1824
1825static void br_multicast_read_querier(const struct bridge_mcast_querier *querier,
1826 struct bridge_mcast_querier *dest)
1827{
1828 unsigned int seq;
1829
1830 memset(dest, 0, sizeof(*dest));
1831 do {
1832 seq = read_seqcount_begin(&querier->seq);
1833 dest->port_ifidx = querier->port_ifidx;
1834 memcpy(&dest->addr, &querier->addr, sizeof(struct br_ip));
1835 } while (read_seqcount_retry(&querier->seq, seq));
1836}
1837
1838static void br_multicast_update_querier(struct net_bridge_mcast *brmctx,
1839 struct bridge_mcast_querier *querier,
1840 int ifindex,
1841 struct br_ip *saddr)
1842{
1843 write_seqcount_begin(&querier->seq);
1844 querier->port_ifidx = ifindex;
1845 memcpy(&querier->addr, saddr, sizeof(*saddr));
1846 write_seqcount_end(&querier->seq);
1847}
1848
1849static void br_multicast_send_query(struct net_bridge_mcast *brmctx,
1850 struct net_bridge_mcast_port *pmctx,
1851 struct bridge_mcast_own_query *own_query)
1852{
1853 struct bridge_mcast_other_query *other_query = NULL;
1854 struct bridge_mcast_querier *querier;
1855 struct br_ip br_group;
1856 unsigned long time;
1857
1858 if (!br_multicast_ctx_should_use(brmctx, pmctx) ||
1859 !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED) ||
1860 !brmctx->multicast_querier)
1861 return;
1862
1863 memset(&br_group.dst, 0, sizeof(br_group.dst));
1864
1865 if (pmctx ? (own_query == &pmctx->ip4_own_query) :
1866 (own_query == &brmctx->ip4_own_query)) {
1867 querier = &brmctx->ip4_querier;
1868 other_query = &brmctx->ip4_other_query;
1869 br_group.proto = htons(ETH_P_IP);
1870#if IS_ENABLED(CONFIG_IPV6)
1871 } else {
1872 querier = &brmctx->ip6_querier;
1873 other_query = &brmctx->ip6_other_query;
1874 br_group.proto = htons(ETH_P_IPV6);
1875#endif
1876 }
1877
1878 if (!other_query || timer_pending(&other_query->timer))
1879 return;
1880
1881 /* we're about to select ourselves as querier */
1882 if (!pmctx && querier->port_ifidx) {
1883 struct br_ip zeroip = {};
1884
1885 br_multicast_update_querier(brmctx, querier, 0, &zeroip);
1886 }
1887
1888 __br_multicast_send_query(brmctx, pmctx, NULL, NULL, &br_group, false,
1889 0, NULL);
1890
1891 time = jiffies;
1892 time += own_query->startup_sent < brmctx->multicast_startup_query_count ?
1893 brmctx->multicast_startup_query_interval :
1894 brmctx->multicast_query_interval;
1895 mod_timer(&own_query->timer, time);
1896}
1897
1898static void
1899br_multicast_port_query_expired(struct net_bridge_mcast_port *pmctx,
1900 struct bridge_mcast_own_query *query)
1901{
1902 struct net_bridge *br = pmctx->port->br;
1903 struct net_bridge_mcast *brmctx;
1904
1905 spin_lock(&br->multicast_lock);
1906 if (br_multicast_port_ctx_state_stopped(pmctx))
1907 goto out;
1908
1909 brmctx = br_multicast_port_ctx_get_global(pmctx);
1910 if (query->startup_sent < brmctx->multicast_startup_query_count)
1911 query->startup_sent++;
1912
1913 br_multicast_send_query(brmctx, pmctx, query);
1914
1915out:
1916 spin_unlock(&br->multicast_lock);
1917}
1918
1919static void br_ip4_multicast_port_query_expired(struct timer_list *t)
1920{
1921 struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t,
1922 ip4_own_query.timer);
1923
1924 br_multicast_port_query_expired(pmctx, &pmctx->ip4_own_query);
1925}
1926
1927#if IS_ENABLED(CONFIG_IPV6)
1928static void br_ip6_multicast_port_query_expired(struct timer_list *t)
1929{
1930 struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t,
1931 ip6_own_query.timer);
1932
1933 br_multicast_port_query_expired(pmctx, &pmctx->ip6_own_query);
1934}
1935#endif
1936
1937static void br_multicast_port_group_rexmit(struct timer_list *t)
1938{
1939 struct net_bridge_port_group *pg = from_timer(pg, t, rexmit_timer);
1940 struct bridge_mcast_other_query *other_query = NULL;
1941 struct net_bridge *br = pg->key.port->br;
1942 struct net_bridge_mcast_port *pmctx;
1943 struct net_bridge_mcast *brmctx;
1944 bool need_rexmit = false;
1945
1946 spin_lock(&br->multicast_lock);
1947 if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) ||
1948 !br_opt_get(br, BROPT_MULTICAST_ENABLED))
1949 goto out;
1950
1951 pmctx = br_multicast_pg_to_port_ctx(pg);
1952 if (!pmctx)
1953 goto out;
1954 brmctx = br_multicast_port_ctx_get_global(pmctx);
1955 if (!brmctx->multicast_querier)
1956 goto out;
1957
1958 if (pg->key.addr.proto == htons(ETH_P_IP))
1959 other_query = &brmctx->ip4_other_query;
1960#if IS_ENABLED(CONFIG_IPV6)
1961 else
1962 other_query = &brmctx->ip6_other_query;
1963#endif
1964
1965 if (!other_query || timer_pending(&other_query->timer))
1966 goto out;
1967
1968 if (pg->grp_query_rexmit_cnt) {
1969 pg->grp_query_rexmit_cnt--;
1970 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr,
1971 &pg->key.addr, false, 1, NULL);
1972 }
1973 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr,
1974 &pg->key.addr, true, 0, &need_rexmit);
1975
1976 if (pg->grp_query_rexmit_cnt || need_rexmit)
1977 mod_timer(&pg->rexmit_timer, jiffies +
1978 brmctx->multicast_last_member_interval);
1979out:
1980 spin_unlock(&br->multicast_lock);
1981}
1982
1983static int br_mc_disabled_update(struct net_device *dev, bool value,
1984 struct netlink_ext_ack *extack)
1985{
1986 struct switchdev_attr attr = {
1987 .orig_dev = dev,
1988 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
1989 .flags = SWITCHDEV_F_DEFER,
1990 .u.mc_disabled = !value,
1991 };
1992
1993 return switchdev_port_attr_set(dev, &attr, extack);
1994}
1995
1996void br_multicast_port_ctx_init(struct net_bridge_port *port,
1997 struct net_bridge_vlan *vlan,
1998 struct net_bridge_mcast_port *pmctx)
1999{
2000 pmctx->port = port;
2001 pmctx->vlan = vlan;
2002 pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2003 timer_setup(&pmctx->ip4_mc_router_timer,
2004 br_ip4_multicast_router_expired, 0);
2005 timer_setup(&pmctx->ip4_own_query.timer,
2006 br_ip4_multicast_port_query_expired, 0);
2007#if IS_ENABLED(CONFIG_IPV6)
2008 timer_setup(&pmctx->ip6_mc_router_timer,
2009 br_ip6_multicast_router_expired, 0);
2010 timer_setup(&pmctx->ip6_own_query.timer,
2011 br_ip6_multicast_port_query_expired, 0);
2012#endif
2013}
2014
2015void br_multicast_port_ctx_deinit(struct net_bridge_mcast_port *pmctx)
2016{
2017#if IS_ENABLED(CONFIG_IPV6)
2018 del_timer_sync(&pmctx->ip6_mc_router_timer);
2019#endif
2020 del_timer_sync(&pmctx->ip4_mc_router_timer);
2021}
2022
2023int br_multicast_add_port(struct net_bridge_port *port)
2024{
2025 int err;
2026
2027 port->multicast_eht_hosts_limit = BR_MCAST_DEFAULT_EHT_HOSTS_LIMIT;
2028 br_multicast_port_ctx_init(port, NULL, &port->multicast_ctx);
2029
2030 err = br_mc_disabled_update(port->dev,
2031 br_opt_get(port->br,
2032 BROPT_MULTICAST_ENABLED),
2033 NULL);
2034 if (err && err != -EOPNOTSUPP)
2035 return err;
2036
2037 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2038 if (!port->mcast_stats)
2039 return -ENOMEM;
2040
2041 return 0;
2042}
2043
2044void br_multicast_del_port(struct net_bridge_port *port)
2045{
2046 struct net_bridge *br = port->br;
2047 struct net_bridge_port_group *pg;
2048 HLIST_HEAD(deleted_head);
2049 struct hlist_node *n;
2050
2051 /* Take care of the remaining groups, only perm ones should be left */
2052 spin_lock_bh(&br->multicast_lock);
2053 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
2054 br_multicast_find_del_pg(br, pg);
2055 hlist_move_list(&br->mcast_gc_list, &deleted_head);
2056 spin_unlock_bh(&br->multicast_lock);
2057 br_multicast_gc(&deleted_head);
2058 br_multicast_port_ctx_deinit(&port->multicast_ctx);
2059 free_percpu(port->mcast_stats);
2060}
2061
2062static void br_multicast_enable(struct bridge_mcast_own_query *query)
2063{
2064 query->startup_sent = 0;
2065
2066 if (try_to_del_timer_sync(&query->timer) >= 0 ||
2067 del_timer(&query->timer))
2068 mod_timer(&query->timer, jiffies);
2069}
2070
2071static void __br_multicast_enable_port_ctx(struct net_bridge_mcast_port *pmctx)
2072{
2073 struct net_bridge *br = pmctx->port->br;
2074 struct net_bridge_mcast *brmctx;
2075
2076 brmctx = br_multicast_port_ctx_get_global(pmctx);
2077 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
2078 !netif_running(br->dev))
2079 return;
2080
2081 br_multicast_enable(&pmctx->ip4_own_query);
2082#if IS_ENABLED(CONFIG_IPV6)
2083 br_multicast_enable(&pmctx->ip6_own_query);
2084#endif
2085 if (pmctx->multicast_router == MDB_RTR_TYPE_PERM) {
2086 br_ip4_multicast_add_router(brmctx, pmctx);
2087 br_ip6_multicast_add_router(brmctx, pmctx);
2088 }
2089
2090 if (br_multicast_port_ctx_is_vlan(pmctx)) {
2091 struct net_bridge_port_group *pg;
2092 u32 n = 0;
2093
2094 /* The mcast_n_groups counter might be wrong. First,
2095 * BR_VLFLAG_MCAST_ENABLED is toggled before temporary entries
2096 * are flushed, thus mcast_n_groups after the toggle does not
2097 * reflect the true values. And second, permanent entries added
2098 * while BR_VLFLAG_MCAST_ENABLED was disabled, are not reflected
2099 * either. Thus we have to refresh the counter.
2100 */
2101
2102 hlist_for_each_entry(pg, &pmctx->port->mglist, mglist) {
2103 if (pg->key.addr.vid == pmctx->vlan->vid)
2104 n++;
2105 }
2106 WRITE_ONCE(pmctx->mdb_n_entries, n);
2107 }
2108}
2109
2110void br_multicast_enable_port(struct net_bridge_port *port)
2111{
2112 struct net_bridge *br = port->br;
2113
2114 spin_lock_bh(&br->multicast_lock);
2115 __br_multicast_enable_port_ctx(&port->multicast_ctx);
2116 spin_unlock_bh(&br->multicast_lock);
2117}
2118
2119static void __br_multicast_disable_port_ctx(struct net_bridge_mcast_port *pmctx)
2120{
2121 struct net_bridge_port_group *pg;
2122 struct hlist_node *n;
2123 bool del = false;
2124
2125 hlist_for_each_entry_safe(pg, n, &pmctx->port->mglist, mglist)
2126 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT) &&
2127 (!br_multicast_port_ctx_is_vlan(pmctx) ||
2128 pg->key.addr.vid == pmctx->vlan->vid))
2129 br_multicast_find_del_pg(pmctx->port->br, pg);
2130
2131 del |= br_ip4_multicast_rport_del(pmctx);
2132 del_timer(&pmctx->ip4_mc_router_timer);
2133 del_timer(&pmctx->ip4_own_query.timer);
2134 del |= br_ip6_multicast_rport_del(pmctx);
2135#if IS_ENABLED(CONFIG_IPV6)
2136 del_timer(&pmctx->ip6_mc_router_timer);
2137 del_timer(&pmctx->ip6_own_query.timer);
2138#endif
2139 br_multicast_rport_del_notify(pmctx, del);
2140}
2141
2142void br_multicast_disable_port(struct net_bridge_port *port)
2143{
2144 spin_lock_bh(&port->br->multicast_lock);
2145 __br_multicast_disable_port_ctx(&port->multicast_ctx);
2146 spin_unlock_bh(&port->br->multicast_lock);
2147}
2148
2149static int __grp_src_delete_marked(struct net_bridge_port_group *pg)
2150{
2151 struct net_bridge_group_src *ent;
2152 struct hlist_node *tmp;
2153 int deleted = 0;
2154
2155 hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node)
2156 if (ent->flags & BR_SGRP_F_DELETE) {
2157 br_multicast_del_group_src(ent, false);
2158 deleted++;
2159 }
2160
2161 return deleted;
2162}
2163
2164static void __grp_src_mod_timer(struct net_bridge_group_src *src,
2165 unsigned long expires)
2166{
2167 mod_timer(&src->timer, expires);
2168 br_multicast_fwd_src_handle(src);
2169}
2170
2171static void __grp_src_query_marked_and_rexmit(struct net_bridge_mcast *brmctx,
2172 struct net_bridge_mcast_port *pmctx,
2173 struct net_bridge_port_group *pg)
2174{
2175 struct bridge_mcast_other_query *other_query = NULL;
2176 u32 lmqc = brmctx->multicast_last_member_count;
2177 unsigned long lmqt, lmi, now = jiffies;
2178 struct net_bridge_group_src *ent;
2179
2180 if (!netif_running(brmctx->br->dev) ||
2181 !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED))
2182 return;
2183
2184 if (pg->key.addr.proto == htons(ETH_P_IP))
2185 other_query = &brmctx->ip4_other_query;
2186#if IS_ENABLED(CONFIG_IPV6)
2187 else
2188 other_query = &brmctx->ip6_other_query;
2189#endif
2190
2191 lmqt = now + br_multicast_lmqt(brmctx);
2192 hlist_for_each_entry(ent, &pg->src_list, node) {
2193 if (ent->flags & BR_SGRP_F_SEND) {
2194 ent->flags &= ~BR_SGRP_F_SEND;
2195 if (ent->timer.expires > lmqt) {
2196 if (brmctx->multicast_querier &&
2197 other_query &&
2198 !timer_pending(&other_query->timer))
2199 ent->src_query_rexmit_cnt = lmqc;
2200 __grp_src_mod_timer(ent, lmqt);
2201 }
2202 }
2203 }
2204
2205 if (!brmctx->multicast_querier ||
2206 !other_query || timer_pending(&other_query->timer))
2207 return;
2208
2209 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr,
2210 &pg->key.addr, true, 1, NULL);
2211
2212 lmi = now + brmctx->multicast_last_member_interval;
2213 if (!timer_pending(&pg->rexmit_timer) ||
2214 time_after(pg->rexmit_timer.expires, lmi))
2215 mod_timer(&pg->rexmit_timer, lmi);
2216}
2217
2218static void __grp_send_query_and_rexmit(struct net_bridge_mcast *brmctx,
2219 struct net_bridge_mcast_port *pmctx,
2220 struct net_bridge_port_group *pg)
2221{
2222 struct bridge_mcast_other_query *other_query = NULL;
2223 unsigned long now = jiffies, lmi;
2224
2225 if (!netif_running(brmctx->br->dev) ||
2226 !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED))
2227 return;
2228
2229 if (pg->key.addr.proto == htons(ETH_P_IP))
2230 other_query = &brmctx->ip4_other_query;
2231#if IS_ENABLED(CONFIG_IPV6)
2232 else
2233 other_query = &brmctx->ip6_other_query;
2234#endif
2235
2236 if (brmctx->multicast_querier &&
2237 other_query && !timer_pending(&other_query->timer)) {
2238 lmi = now + brmctx->multicast_last_member_interval;
2239 pg->grp_query_rexmit_cnt = brmctx->multicast_last_member_count - 1;
2240 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr,
2241 &pg->key.addr, false, 0, NULL);
2242 if (!timer_pending(&pg->rexmit_timer) ||
2243 time_after(pg->rexmit_timer.expires, lmi))
2244 mod_timer(&pg->rexmit_timer, lmi);
2245 }
2246
2247 if (pg->filter_mode == MCAST_EXCLUDE &&
2248 (!timer_pending(&pg->timer) ||
2249 time_after(pg->timer.expires, now + br_multicast_lmqt(brmctx))))
2250 mod_timer(&pg->timer, now + br_multicast_lmqt(brmctx));
2251}
2252
2253/* State Msg type New state Actions
2254 * INCLUDE (A) IS_IN (B) INCLUDE (A+B) (B)=GMI
2255 * INCLUDE (A) ALLOW (B) INCLUDE (A+B) (B)=GMI
2256 * EXCLUDE (X,Y) ALLOW (A) EXCLUDE (X+A,Y-A) (A)=GMI
2257 */
2258static bool br_multicast_isinc_allow(const struct net_bridge_mcast *brmctx,
2259 struct net_bridge_port_group *pg, void *h_addr,
2260 void *srcs, u32 nsrcs, size_t addr_size,
2261 int grec_type)
2262{
2263 struct net_bridge_group_src *ent;
2264 unsigned long now = jiffies;
2265 bool changed = false;
2266 struct br_ip src_ip;
2267 u32 src_idx;
2268
2269 memset(&src_ip, 0, sizeof(src_ip));
2270 src_ip.proto = pg->key.addr.proto;
2271 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2272 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2273 ent = br_multicast_find_group_src(pg, &src_ip);
2274 if (!ent) {
2275 ent = br_multicast_new_group_src(pg, &src_ip);
2276 if (ent)
2277 changed = true;
2278 }
2279
2280 if (ent)
2281 __grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx));
2282 }
2283
2284 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2285 grec_type))
2286 changed = true;
2287
2288 return changed;
2289}
2290
2291/* State Msg type New state Actions
2292 * INCLUDE (A) IS_EX (B) EXCLUDE (A*B,B-A) (B-A)=0
2293 * Delete (A-B)
2294 * Group Timer=GMI
2295 */
2296static void __grp_src_isexc_incl(const struct net_bridge_mcast *brmctx,
2297 struct net_bridge_port_group *pg, void *h_addr,
2298 void *srcs, u32 nsrcs, size_t addr_size,
2299 int grec_type)
2300{
2301 struct net_bridge_group_src *ent;
2302 struct br_ip src_ip;
2303 u32 src_idx;
2304
2305 hlist_for_each_entry(ent, &pg->src_list, node)
2306 ent->flags |= BR_SGRP_F_DELETE;
2307
2308 memset(&src_ip, 0, sizeof(src_ip));
2309 src_ip.proto = pg->key.addr.proto;
2310 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2311 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2312 ent = br_multicast_find_group_src(pg, &src_ip);
2313 if (ent)
2314 ent->flags &= ~BR_SGRP_F_DELETE;
2315 else
2316 ent = br_multicast_new_group_src(pg, &src_ip);
2317 if (ent)
2318 br_multicast_fwd_src_handle(ent);
2319 }
2320
2321 br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2322 grec_type);
2323
2324 __grp_src_delete_marked(pg);
2325}
2326
2327/* State Msg type New state Actions
2328 * EXCLUDE (X,Y) IS_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=GMI
2329 * Delete (X-A)
2330 * Delete (Y-A)
2331 * Group Timer=GMI
2332 */
2333static bool __grp_src_isexc_excl(const struct net_bridge_mcast *brmctx,
2334 struct net_bridge_port_group *pg, void *h_addr,
2335 void *srcs, u32 nsrcs, size_t addr_size,
2336 int grec_type)
2337{
2338 struct net_bridge_group_src *ent;
2339 unsigned long now = jiffies;
2340 bool changed = false;
2341 struct br_ip src_ip;
2342 u32 src_idx;
2343
2344 hlist_for_each_entry(ent, &pg->src_list, node)
2345 ent->flags |= BR_SGRP_F_DELETE;
2346
2347 memset(&src_ip, 0, sizeof(src_ip));
2348 src_ip.proto = pg->key.addr.proto;
2349 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2350 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2351 ent = br_multicast_find_group_src(pg, &src_ip);
2352 if (ent) {
2353 ent->flags &= ~BR_SGRP_F_DELETE;
2354 } else {
2355 ent = br_multicast_new_group_src(pg, &src_ip);
2356 if (ent) {
2357 __grp_src_mod_timer(ent,
2358 now + br_multicast_gmi(brmctx));
2359 changed = true;
2360 }
2361 }
2362 }
2363
2364 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2365 grec_type))
2366 changed = true;
2367
2368 if (__grp_src_delete_marked(pg))
2369 changed = true;
2370
2371 return changed;
2372}
2373
2374static bool br_multicast_isexc(const struct net_bridge_mcast *brmctx,
2375 struct net_bridge_port_group *pg, void *h_addr,
2376 void *srcs, u32 nsrcs, size_t addr_size,
2377 int grec_type)
2378{
2379 bool changed = false;
2380
2381 switch (pg->filter_mode) {
2382 case MCAST_INCLUDE:
2383 __grp_src_isexc_incl(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2384 grec_type);
2385 br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE);
2386 changed = true;
2387 break;
2388 case MCAST_EXCLUDE:
2389 changed = __grp_src_isexc_excl(brmctx, pg, h_addr, srcs, nsrcs,
2390 addr_size, grec_type);
2391 break;
2392 }
2393
2394 pg->filter_mode = MCAST_EXCLUDE;
2395 mod_timer(&pg->timer, jiffies + br_multicast_gmi(brmctx));
2396
2397 return changed;
2398}
2399
2400/* State Msg type New state Actions
2401 * INCLUDE (A) TO_IN (B) INCLUDE (A+B) (B)=GMI
2402 * Send Q(G,A-B)
2403 */
2404static bool __grp_src_toin_incl(struct net_bridge_mcast *brmctx,
2405 struct net_bridge_mcast_port *pmctx,
2406 struct net_bridge_port_group *pg, void *h_addr,
2407 void *srcs, u32 nsrcs, size_t addr_size,
2408 int grec_type)
2409{
2410 u32 src_idx, to_send = pg->src_ents;
2411 struct net_bridge_group_src *ent;
2412 unsigned long now = jiffies;
2413 bool changed = false;
2414 struct br_ip src_ip;
2415
2416 hlist_for_each_entry(ent, &pg->src_list, node)
2417 ent->flags |= BR_SGRP_F_SEND;
2418
2419 memset(&src_ip, 0, sizeof(src_ip));
2420 src_ip.proto = pg->key.addr.proto;
2421 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2422 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2423 ent = br_multicast_find_group_src(pg, &src_ip);
2424 if (ent) {
2425 ent->flags &= ~BR_SGRP_F_SEND;
2426 to_send--;
2427 } else {
2428 ent = br_multicast_new_group_src(pg, &src_ip);
2429 if (ent)
2430 changed = true;
2431 }
2432 if (ent)
2433 __grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx));
2434 }
2435
2436 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2437 grec_type))
2438 changed = true;
2439
2440 if (to_send)
2441 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg);
2442
2443 return changed;
2444}
2445
2446/* State Msg type New state Actions
2447 * EXCLUDE (X,Y) TO_IN (A) EXCLUDE (X+A,Y-A) (A)=GMI
2448 * Send Q(G,X-A)
2449 * Send Q(G)
2450 */
2451static bool __grp_src_toin_excl(struct net_bridge_mcast *brmctx,
2452 struct net_bridge_mcast_port *pmctx,
2453 struct net_bridge_port_group *pg, void *h_addr,
2454 void *srcs, u32 nsrcs, size_t addr_size,
2455 int grec_type)
2456{
2457 u32 src_idx, to_send = pg->src_ents;
2458 struct net_bridge_group_src *ent;
2459 unsigned long now = jiffies;
2460 bool changed = false;
2461 struct br_ip src_ip;
2462
2463 hlist_for_each_entry(ent, &pg->src_list, node)
2464 if (timer_pending(&ent->timer))
2465 ent->flags |= BR_SGRP_F_SEND;
2466
2467 memset(&src_ip, 0, sizeof(src_ip));
2468 src_ip.proto = pg->key.addr.proto;
2469 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2470 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2471 ent = br_multicast_find_group_src(pg, &src_ip);
2472 if (ent) {
2473 if (timer_pending(&ent->timer)) {
2474 ent->flags &= ~BR_SGRP_F_SEND;
2475 to_send--;
2476 }
2477 } else {
2478 ent = br_multicast_new_group_src(pg, &src_ip);
2479 if (ent)
2480 changed = true;
2481 }
2482 if (ent)
2483 __grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx));
2484 }
2485
2486 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2487 grec_type))
2488 changed = true;
2489
2490 if (to_send)
2491 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg);
2492
2493 __grp_send_query_and_rexmit(brmctx, pmctx, pg);
2494
2495 return changed;
2496}
2497
2498static bool br_multicast_toin(struct net_bridge_mcast *brmctx,
2499 struct net_bridge_mcast_port *pmctx,
2500 struct net_bridge_port_group *pg, void *h_addr,
2501 void *srcs, u32 nsrcs, size_t addr_size,
2502 int grec_type)
2503{
2504 bool changed = false;
2505
2506 switch (pg->filter_mode) {
2507 case MCAST_INCLUDE:
2508 changed = __grp_src_toin_incl(brmctx, pmctx, pg, h_addr, srcs,
2509 nsrcs, addr_size, grec_type);
2510 break;
2511 case MCAST_EXCLUDE:
2512 changed = __grp_src_toin_excl(brmctx, pmctx, pg, h_addr, srcs,
2513 nsrcs, addr_size, grec_type);
2514 break;
2515 }
2516
2517 if (br_multicast_eht_should_del_pg(pg)) {
2518 pg->flags |= MDB_PG_FLAGS_FAST_LEAVE;
2519 br_multicast_find_del_pg(pg->key.port->br, pg);
2520 /* a notification has already been sent and we shouldn't
2521 * access pg after the delete so we have to return false
2522 */
2523 changed = false;
2524 }
2525
2526 return changed;
2527}
2528
2529/* State Msg type New state Actions
2530 * INCLUDE (A) TO_EX (B) EXCLUDE (A*B,B-A) (B-A)=0
2531 * Delete (A-B)
2532 * Send Q(G,A*B)
2533 * Group Timer=GMI
2534 */
2535static void __grp_src_toex_incl(struct net_bridge_mcast *brmctx,
2536 struct net_bridge_mcast_port *pmctx,
2537 struct net_bridge_port_group *pg, void *h_addr,
2538 void *srcs, u32 nsrcs, size_t addr_size,
2539 int grec_type)
2540{
2541 struct net_bridge_group_src *ent;
2542 u32 src_idx, to_send = 0;
2543 struct br_ip src_ip;
2544
2545 hlist_for_each_entry(ent, &pg->src_list, node)
2546 ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE;
2547
2548 memset(&src_ip, 0, sizeof(src_ip));
2549 src_ip.proto = pg->key.addr.proto;
2550 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2551 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2552 ent = br_multicast_find_group_src(pg, &src_ip);
2553 if (ent) {
2554 ent->flags = (ent->flags & ~BR_SGRP_F_DELETE) |
2555 BR_SGRP_F_SEND;
2556 to_send++;
2557 } else {
2558 ent = br_multicast_new_group_src(pg, &src_ip);
2559 }
2560 if (ent)
2561 br_multicast_fwd_src_handle(ent);
2562 }
2563
2564 br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2565 grec_type);
2566
2567 __grp_src_delete_marked(pg);
2568 if (to_send)
2569 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg);
2570}
2571
2572/* State Msg type New state Actions
2573 * EXCLUDE (X,Y) TO_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=Group Timer
2574 * Delete (X-A)
2575 * Delete (Y-A)
2576 * Send Q(G,A-Y)
2577 * Group Timer=GMI
2578 */
2579static bool __grp_src_toex_excl(struct net_bridge_mcast *brmctx,
2580 struct net_bridge_mcast_port *pmctx,
2581 struct net_bridge_port_group *pg, void *h_addr,
2582 void *srcs, u32 nsrcs, size_t addr_size,
2583 int grec_type)
2584{
2585 struct net_bridge_group_src *ent;
2586 u32 src_idx, to_send = 0;
2587 bool changed = false;
2588 struct br_ip src_ip;
2589
2590 hlist_for_each_entry(ent, &pg->src_list, node)
2591 ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE;
2592
2593 memset(&src_ip, 0, sizeof(src_ip));
2594 src_ip.proto = pg->key.addr.proto;
2595 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2596 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2597 ent = br_multicast_find_group_src(pg, &src_ip);
2598 if (ent) {
2599 ent->flags &= ~BR_SGRP_F_DELETE;
2600 } else {
2601 ent = br_multicast_new_group_src(pg, &src_ip);
2602 if (ent) {
2603 __grp_src_mod_timer(ent, pg->timer.expires);
2604 changed = true;
2605 }
2606 }
2607 if (ent && timer_pending(&ent->timer)) {
2608 ent->flags |= BR_SGRP_F_SEND;
2609 to_send++;
2610 }
2611 }
2612
2613 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2614 grec_type))
2615 changed = true;
2616
2617 if (__grp_src_delete_marked(pg))
2618 changed = true;
2619 if (to_send)
2620 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg);
2621
2622 return changed;
2623}
2624
2625static bool br_multicast_toex(struct net_bridge_mcast *brmctx,
2626 struct net_bridge_mcast_port *pmctx,
2627 struct net_bridge_port_group *pg, void *h_addr,
2628 void *srcs, u32 nsrcs, size_t addr_size,
2629 int grec_type)
2630{
2631 bool changed = false;
2632
2633 switch (pg->filter_mode) {
2634 case MCAST_INCLUDE:
2635 __grp_src_toex_incl(brmctx, pmctx, pg, h_addr, srcs, nsrcs,
2636 addr_size, grec_type);
2637 br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE);
2638 changed = true;
2639 break;
2640 case MCAST_EXCLUDE:
2641 changed = __grp_src_toex_excl(brmctx, pmctx, pg, h_addr, srcs,
2642 nsrcs, addr_size, grec_type);
2643 break;
2644 }
2645
2646 pg->filter_mode = MCAST_EXCLUDE;
2647 mod_timer(&pg->timer, jiffies + br_multicast_gmi(brmctx));
2648
2649 return changed;
2650}
2651
2652/* State Msg type New state Actions
2653 * INCLUDE (A) BLOCK (B) INCLUDE (A) Send Q(G,A*B)
2654 */
2655static bool __grp_src_block_incl(struct net_bridge_mcast *brmctx,
2656 struct net_bridge_mcast_port *pmctx,
2657 struct net_bridge_port_group *pg, void *h_addr,
2658 void *srcs, u32 nsrcs, size_t addr_size, int grec_type)
2659{
2660 struct net_bridge_group_src *ent;
2661 u32 src_idx, to_send = 0;
2662 bool changed = false;
2663 struct br_ip src_ip;
2664
2665 hlist_for_each_entry(ent, &pg->src_list, node)
2666 ent->flags &= ~BR_SGRP_F_SEND;
2667
2668 memset(&src_ip, 0, sizeof(src_ip));
2669 src_ip.proto = pg->key.addr.proto;
2670 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2671 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2672 ent = br_multicast_find_group_src(pg, &src_ip);
2673 if (ent) {
2674 ent->flags |= BR_SGRP_F_SEND;
2675 to_send++;
2676 }
2677 }
2678
2679 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2680 grec_type))
2681 changed = true;
2682
2683 if (to_send)
2684 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg);
2685
2686 return changed;
2687}
2688
2689/* State Msg type New state Actions
2690 * EXCLUDE (X,Y) BLOCK (A) EXCLUDE (X+(A-Y),Y) (A-X-Y)=Group Timer
2691 * Send Q(G,A-Y)
2692 */
2693static bool __grp_src_block_excl(struct net_bridge_mcast *brmctx,
2694 struct net_bridge_mcast_port *pmctx,
2695 struct net_bridge_port_group *pg, void *h_addr,
2696 void *srcs, u32 nsrcs, size_t addr_size, int grec_type)
2697{
2698 struct net_bridge_group_src *ent;
2699 u32 src_idx, to_send = 0;
2700 bool changed = false;
2701 struct br_ip src_ip;
2702
2703 hlist_for_each_entry(ent, &pg->src_list, node)
2704 ent->flags &= ~BR_SGRP_F_SEND;
2705
2706 memset(&src_ip, 0, sizeof(src_ip));
2707 src_ip.proto = pg->key.addr.proto;
2708 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2709 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2710 ent = br_multicast_find_group_src(pg, &src_ip);
2711 if (!ent) {
2712 ent = br_multicast_new_group_src(pg, &src_ip);
2713 if (ent) {
2714 __grp_src_mod_timer(ent, pg->timer.expires);
2715 changed = true;
2716 }
2717 }
2718 if (ent && timer_pending(&ent->timer)) {
2719 ent->flags |= BR_SGRP_F_SEND;
2720 to_send++;
2721 }
2722 }
2723
2724 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2725 grec_type))
2726 changed = true;
2727
2728 if (to_send)
2729 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg);
2730
2731 return changed;
2732}
2733
2734static bool br_multicast_block(struct net_bridge_mcast *brmctx,
2735 struct net_bridge_mcast_port *pmctx,
2736 struct net_bridge_port_group *pg, void *h_addr,
2737 void *srcs, u32 nsrcs, size_t addr_size, int grec_type)
2738{
2739 bool changed = false;
2740
2741 switch (pg->filter_mode) {
2742 case MCAST_INCLUDE:
2743 changed = __grp_src_block_incl(brmctx, pmctx, pg, h_addr, srcs,
2744 nsrcs, addr_size, grec_type);
2745 break;
2746 case MCAST_EXCLUDE:
2747 changed = __grp_src_block_excl(brmctx, pmctx, pg, h_addr, srcs,
2748 nsrcs, addr_size, grec_type);
2749 break;
2750 }
2751
2752 if ((pg->filter_mode == MCAST_INCLUDE && hlist_empty(&pg->src_list)) ||
2753 br_multicast_eht_should_del_pg(pg)) {
2754 if (br_multicast_eht_should_del_pg(pg))
2755 pg->flags |= MDB_PG_FLAGS_FAST_LEAVE;
2756 br_multicast_find_del_pg(pg->key.port->br, pg);
2757 /* a notification has already been sent and we shouldn't
2758 * access pg after the delete so we have to return false
2759 */
2760 changed = false;
2761 }
2762
2763 return changed;
2764}
2765
2766static struct net_bridge_port_group *
2767br_multicast_find_port(struct net_bridge_mdb_entry *mp,
2768 struct net_bridge_port *p,
2769 const unsigned char *src)
2770{
2771 struct net_bridge *br __maybe_unused = mp->br;
2772 struct net_bridge_port_group *pg;
2773
2774 for (pg = mlock_dereference(mp->ports, br);
2775 pg;
2776 pg = mlock_dereference(pg->next, br))
2777 if (br_port_group_equal(pg, p, src))
2778 return pg;
2779
2780 return NULL;
2781}
2782
2783static int br_ip4_multicast_igmp3_report(struct net_bridge_mcast *brmctx,
2784 struct net_bridge_mcast_port *pmctx,
2785 struct sk_buff *skb,
2786 u16 vid)
2787{
2788 bool igmpv2 = brmctx->multicast_igmp_version == 2;
2789 struct net_bridge_mdb_entry *mdst;
2790 struct net_bridge_port_group *pg;
2791 const unsigned char *src;
2792 struct igmpv3_report *ih;
2793 struct igmpv3_grec *grec;
2794 int i, len, num, type;
2795 __be32 group, *h_addr;
2796 bool changed = false;
2797 int err = 0;
2798 u16 nsrcs;
2799
2800 ih = igmpv3_report_hdr(skb);
2801 num = ntohs(ih->ngrec);
2802 len = skb_transport_offset(skb) + sizeof(*ih);
2803
2804 for (i = 0; i < num; i++) {
2805 len += sizeof(*grec);
2806 if (!ip_mc_may_pull(skb, len))
2807 return -EINVAL;
2808
2809 grec = (void *)(skb->data + len - sizeof(*grec));
2810 group = grec->grec_mca;
2811 type = grec->grec_type;
2812 nsrcs = ntohs(grec->grec_nsrcs);
2813
2814 len += nsrcs * 4;
2815 if (!ip_mc_may_pull(skb, len))
2816 return -EINVAL;
2817
2818 switch (type) {
2819 case IGMPV3_MODE_IS_INCLUDE:
2820 case IGMPV3_MODE_IS_EXCLUDE:
2821 case IGMPV3_CHANGE_TO_INCLUDE:
2822 case IGMPV3_CHANGE_TO_EXCLUDE:
2823 case IGMPV3_ALLOW_NEW_SOURCES:
2824 case IGMPV3_BLOCK_OLD_SOURCES:
2825 break;
2826
2827 default:
2828 continue;
2829 }
2830
2831 src = eth_hdr(skb)->h_source;
2832 if (nsrcs == 0 &&
2833 (type == IGMPV3_CHANGE_TO_INCLUDE ||
2834 type == IGMPV3_MODE_IS_INCLUDE)) {
2835 if (!pmctx || igmpv2) {
2836 br_ip4_multicast_leave_group(brmctx, pmctx,
2837 group, vid, src);
2838 continue;
2839 }
2840 } else {
2841 err = br_ip4_multicast_add_group(brmctx, pmctx, group,
2842 vid, src, igmpv2);
2843 if (err)
2844 break;
2845 }
2846
2847 if (!pmctx || igmpv2)
2848 continue;
2849
2850 spin_lock(&brmctx->br->multicast_lock);
2851 if (!br_multicast_ctx_should_use(brmctx, pmctx))
2852 goto unlock_continue;
2853
2854 mdst = br_mdb_ip4_get(brmctx->br, group, vid);
2855 if (!mdst)
2856 goto unlock_continue;
2857 pg = br_multicast_find_port(mdst, pmctx->port, src);
2858 if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT))
2859 goto unlock_continue;
2860 /* reload grec and host addr */
2861 grec = (void *)(skb->data + len - sizeof(*grec) - (nsrcs * 4));
2862 h_addr = &ip_hdr(skb)->saddr;
2863 switch (type) {
2864 case IGMPV3_ALLOW_NEW_SOURCES:
2865 changed = br_multicast_isinc_allow(brmctx, pg, h_addr,
2866 grec->grec_src,
2867 nsrcs, sizeof(__be32), type);
2868 break;
2869 case IGMPV3_MODE_IS_INCLUDE:
2870 changed = br_multicast_isinc_allow(brmctx, pg, h_addr,
2871 grec->grec_src,
2872 nsrcs, sizeof(__be32), type);
2873 break;
2874 case IGMPV3_MODE_IS_EXCLUDE:
2875 changed = br_multicast_isexc(brmctx, pg, h_addr,
2876 grec->grec_src,
2877 nsrcs, sizeof(__be32), type);
2878 break;
2879 case IGMPV3_CHANGE_TO_INCLUDE:
2880 changed = br_multicast_toin(brmctx, pmctx, pg, h_addr,
2881 grec->grec_src,
2882 nsrcs, sizeof(__be32), type);
2883 break;
2884 case IGMPV3_CHANGE_TO_EXCLUDE:
2885 changed = br_multicast_toex(brmctx, pmctx, pg, h_addr,
2886 grec->grec_src,
2887 nsrcs, sizeof(__be32), type);
2888 break;
2889 case IGMPV3_BLOCK_OLD_SOURCES:
2890 changed = br_multicast_block(brmctx, pmctx, pg, h_addr,
2891 grec->grec_src,
2892 nsrcs, sizeof(__be32), type);
2893 break;
2894 }
2895 if (changed)
2896 br_mdb_notify(brmctx->br->dev, mdst, pg, RTM_NEWMDB);
2897unlock_continue:
2898 spin_unlock(&brmctx->br->multicast_lock);
2899 }
2900
2901 return err;
2902}
2903
2904#if IS_ENABLED(CONFIG_IPV6)
2905static int br_ip6_multicast_mld2_report(struct net_bridge_mcast *brmctx,
2906 struct net_bridge_mcast_port *pmctx,
2907 struct sk_buff *skb,
2908 u16 vid)
2909{
2910 bool mldv1 = brmctx->multicast_mld_version == 1;
2911 struct net_bridge_mdb_entry *mdst;
2912 struct net_bridge_port_group *pg;
2913 unsigned int nsrcs_offset;
2914 struct mld2_report *mld2r;
2915 const unsigned char *src;
2916 struct in6_addr *h_addr;
2917 struct mld2_grec *grec;
2918 unsigned int grec_len;
2919 bool changed = false;
2920 int i, len, num;
2921 int err = 0;
2922
2923 if (!ipv6_mc_may_pull(skb, sizeof(*mld2r)))
2924 return -EINVAL;
2925
2926 mld2r = (struct mld2_report *)icmp6_hdr(skb);
2927 num = ntohs(mld2r->mld2r_ngrec);
2928 len = skb_transport_offset(skb) + sizeof(*mld2r);
2929
2930 for (i = 0; i < num; i++) {
2931 __be16 *_nsrcs, __nsrcs;
2932 u16 nsrcs;
2933
2934 nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs);
2935
2936 if (skb_transport_offset(skb) + ipv6_transport_len(skb) <
2937 nsrcs_offset + sizeof(__nsrcs))
2938 return -EINVAL;
2939
2940 _nsrcs = skb_header_pointer(skb, nsrcs_offset,
2941 sizeof(__nsrcs), &__nsrcs);
2942 if (!_nsrcs)
2943 return -EINVAL;
2944
2945 nsrcs = ntohs(*_nsrcs);
2946 grec_len = struct_size(grec, grec_src, nsrcs);
2947
2948 if (!ipv6_mc_may_pull(skb, len + grec_len))
2949 return -EINVAL;
2950
2951 grec = (struct mld2_grec *)(skb->data + len);
2952 len += grec_len;
2953
2954 switch (grec->grec_type) {
2955 case MLD2_MODE_IS_INCLUDE:
2956 case MLD2_MODE_IS_EXCLUDE:
2957 case MLD2_CHANGE_TO_INCLUDE:
2958 case MLD2_CHANGE_TO_EXCLUDE:
2959 case MLD2_ALLOW_NEW_SOURCES:
2960 case MLD2_BLOCK_OLD_SOURCES:
2961 break;
2962
2963 default:
2964 continue;
2965 }
2966
2967 src = eth_hdr(skb)->h_source;
2968 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
2969 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
2970 nsrcs == 0) {
2971 if (!pmctx || mldv1) {
2972 br_ip6_multicast_leave_group(brmctx, pmctx,
2973 &grec->grec_mca,
2974 vid, src);
2975 continue;
2976 }
2977 } else {
2978 err = br_ip6_multicast_add_group(brmctx, pmctx,
2979 &grec->grec_mca, vid,
2980 src, mldv1);
2981 if (err)
2982 break;
2983 }
2984
2985 if (!pmctx || mldv1)
2986 continue;
2987
2988 spin_lock(&brmctx->br->multicast_lock);
2989 if (!br_multicast_ctx_should_use(brmctx, pmctx))
2990 goto unlock_continue;
2991
2992 mdst = br_mdb_ip6_get(brmctx->br, &grec->grec_mca, vid);
2993 if (!mdst)
2994 goto unlock_continue;
2995 pg = br_multicast_find_port(mdst, pmctx->port, src);
2996 if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT))
2997 goto unlock_continue;
2998 h_addr = &ipv6_hdr(skb)->saddr;
2999 switch (grec->grec_type) {
3000 case MLD2_ALLOW_NEW_SOURCES:
3001 changed = br_multicast_isinc_allow(brmctx, pg, h_addr,
3002 grec->grec_src, nsrcs,
3003 sizeof(struct in6_addr),
3004 grec->grec_type);
3005 break;
3006 case MLD2_MODE_IS_INCLUDE:
3007 changed = br_multicast_isinc_allow(brmctx, pg, h_addr,
3008 grec->grec_src, nsrcs,
3009 sizeof(struct in6_addr),
3010 grec->grec_type);
3011 break;
3012 case MLD2_MODE_IS_EXCLUDE:
3013 changed = br_multicast_isexc(brmctx, pg, h_addr,
3014 grec->grec_src, nsrcs,
3015 sizeof(struct in6_addr),
3016 grec->grec_type);
3017 break;
3018 case MLD2_CHANGE_TO_INCLUDE:
3019 changed = br_multicast_toin(brmctx, pmctx, pg, h_addr,
3020 grec->grec_src, nsrcs,
3021 sizeof(struct in6_addr),
3022 grec->grec_type);
3023 break;
3024 case MLD2_CHANGE_TO_EXCLUDE:
3025 changed = br_multicast_toex(brmctx, pmctx, pg, h_addr,
3026 grec->grec_src, nsrcs,
3027 sizeof(struct in6_addr),
3028 grec->grec_type);
3029 break;
3030 case MLD2_BLOCK_OLD_SOURCES:
3031 changed = br_multicast_block(brmctx, pmctx, pg, h_addr,
3032 grec->grec_src, nsrcs,
3033 sizeof(struct in6_addr),
3034 grec->grec_type);
3035 break;
3036 }
3037 if (changed)
3038 br_mdb_notify(brmctx->br->dev, mdst, pg, RTM_NEWMDB);
3039unlock_continue:
3040 spin_unlock(&brmctx->br->multicast_lock);
3041 }
3042
3043 return err;
3044}
3045#endif
3046
3047static bool br_multicast_select_querier(struct net_bridge_mcast *brmctx,
3048 struct net_bridge_mcast_port *pmctx,
3049 struct br_ip *saddr)
3050{
3051 int port_ifidx = pmctx ? pmctx->port->dev->ifindex : 0;
3052 struct timer_list *own_timer, *other_timer;
3053 struct bridge_mcast_querier *querier;
3054
3055 switch (saddr->proto) {
3056 case htons(ETH_P_IP):
3057 querier = &brmctx->ip4_querier;
3058 own_timer = &brmctx->ip4_own_query.timer;
3059 other_timer = &brmctx->ip4_other_query.timer;
3060 if (!querier->addr.src.ip4 ||
3061 ntohl(saddr->src.ip4) <= ntohl(querier->addr.src.ip4))
3062 goto update;
3063 break;
3064#if IS_ENABLED(CONFIG_IPV6)
3065 case htons(ETH_P_IPV6):
3066 querier = &brmctx->ip6_querier;
3067 own_timer = &brmctx->ip6_own_query.timer;
3068 other_timer = &brmctx->ip6_other_query.timer;
3069 if (ipv6_addr_cmp(&saddr->src.ip6, &querier->addr.src.ip6) <= 0)
3070 goto update;
3071 break;
3072#endif
3073 default:
3074 return false;
3075 }
3076
3077 if (!timer_pending(own_timer) && !timer_pending(other_timer))
3078 goto update;
3079
3080 return false;
3081
3082update:
3083 br_multicast_update_querier(brmctx, querier, port_ifidx, saddr);
3084
3085 return true;
3086}
3087
3088static struct net_bridge_port *
3089__br_multicast_get_querier_port(struct net_bridge *br,
3090 const struct bridge_mcast_querier *querier)
3091{
3092 int port_ifidx = READ_ONCE(querier->port_ifidx);
3093 struct net_bridge_port *p;
3094 struct net_device *dev;
3095
3096 if (port_ifidx == 0)
3097 return NULL;
3098
3099 dev = dev_get_by_index_rcu(dev_net(br->dev), port_ifidx);
3100 if (!dev)
3101 return NULL;
3102 p = br_port_get_rtnl_rcu(dev);
3103 if (!p || p->br != br)
3104 return NULL;
3105
3106 return p;
3107}
3108
3109size_t br_multicast_querier_state_size(void)
3110{
3111 return nla_total_size(0) + /* nest attribute */
3112 nla_total_size(sizeof(__be32)) + /* BRIDGE_QUERIER_IP_ADDRESS */
3113 nla_total_size(sizeof(int)) + /* BRIDGE_QUERIER_IP_PORT */
3114 nla_total_size_64bit(sizeof(u64)) + /* BRIDGE_QUERIER_IP_OTHER_TIMER */
3115#if IS_ENABLED(CONFIG_IPV6)
3116 nla_total_size(sizeof(struct in6_addr)) + /* BRIDGE_QUERIER_IPV6_ADDRESS */
3117 nla_total_size(sizeof(int)) + /* BRIDGE_QUERIER_IPV6_PORT */
3118 nla_total_size_64bit(sizeof(u64)) + /* BRIDGE_QUERIER_IPV6_OTHER_TIMER */
3119#endif
3120 0;
3121}
3122
3123/* protected by rtnl or rcu */
3124int br_multicast_dump_querier_state(struct sk_buff *skb,
3125 const struct net_bridge_mcast *brmctx,
3126 int nest_attr)
3127{
3128 struct bridge_mcast_querier querier = {};
3129 struct net_bridge_port *p;
3130 struct nlattr *nest;
3131
3132 if (!br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED) ||
3133 br_multicast_ctx_vlan_global_disabled(brmctx))
3134 return 0;
3135
3136 nest = nla_nest_start(skb, nest_attr);
3137 if (!nest)
3138 return -EMSGSIZE;
3139
3140 rcu_read_lock();
3141 if (!brmctx->multicast_querier &&
3142 !timer_pending(&brmctx->ip4_other_query.timer))
3143 goto out_v6;
3144
3145 br_multicast_read_querier(&brmctx->ip4_querier, &querier);
3146 if (nla_put_in_addr(skb, BRIDGE_QUERIER_IP_ADDRESS,
3147 querier.addr.src.ip4)) {
3148 rcu_read_unlock();
3149 goto out_err;
3150 }
3151
3152 p = __br_multicast_get_querier_port(brmctx->br, &querier);
3153 if (timer_pending(&brmctx->ip4_other_query.timer) &&
3154 (nla_put_u64_64bit(skb, BRIDGE_QUERIER_IP_OTHER_TIMER,
3155 br_timer_value(&brmctx->ip4_other_query.timer),
3156 BRIDGE_QUERIER_PAD) ||
3157 (p && nla_put_u32(skb, BRIDGE_QUERIER_IP_PORT, p->dev->ifindex)))) {
3158 rcu_read_unlock();
3159 goto out_err;
3160 }
3161
3162out_v6:
3163#if IS_ENABLED(CONFIG_IPV6)
3164 if (!brmctx->multicast_querier &&
3165 !timer_pending(&brmctx->ip6_other_query.timer))
3166 goto out;
3167
3168 br_multicast_read_querier(&brmctx->ip6_querier, &querier);
3169 if (nla_put_in6_addr(skb, BRIDGE_QUERIER_IPV6_ADDRESS,
3170 &querier.addr.src.ip6)) {
3171 rcu_read_unlock();
3172 goto out_err;
3173 }
3174
3175 p = __br_multicast_get_querier_port(brmctx->br, &querier);
3176 if (timer_pending(&brmctx->ip6_other_query.timer) &&
3177 (nla_put_u64_64bit(skb, BRIDGE_QUERIER_IPV6_OTHER_TIMER,
3178 br_timer_value(&brmctx->ip6_other_query.timer),
3179 BRIDGE_QUERIER_PAD) ||
3180 (p && nla_put_u32(skb, BRIDGE_QUERIER_IPV6_PORT,
3181 p->dev->ifindex)))) {
3182 rcu_read_unlock();
3183 goto out_err;
3184 }
3185out:
3186#endif
3187 rcu_read_unlock();
3188 nla_nest_end(skb, nest);
3189 if (!nla_len(nest))
3190 nla_nest_cancel(skb, nest);
3191
3192 return 0;
3193
3194out_err:
3195 nla_nest_cancel(skb, nest);
3196 return -EMSGSIZE;
3197}
3198
3199static void
3200br_multicast_update_query_timer(struct net_bridge_mcast *brmctx,
3201 struct bridge_mcast_other_query *query,
3202 unsigned long max_delay)
3203{
3204 if (!timer_pending(&query->timer))
3205 mod_timer(&query->delay_timer, jiffies + max_delay);
3206
3207 mod_timer(&query->timer, jiffies + brmctx->multicast_querier_interval);
3208}
3209
3210static void br_port_mc_router_state_change(struct net_bridge_port *p,
3211 bool is_mc_router)
3212{
3213 struct switchdev_attr attr = {
3214 .orig_dev = p->dev,
3215 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
3216 .flags = SWITCHDEV_F_DEFER,
3217 .u.mrouter = is_mc_router,
3218 };
3219
3220 switchdev_port_attr_set(p->dev, &attr, NULL);
3221}
3222
3223static struct net_bridge_port *
3224br_multicast_rport_from_node(struct net_bridge_mcast *brmctx,
3225 struct hlist_head *mc_router_list,
3226 struct hlist_node *rlist)
3227{
3228 struct net_bridge_mcast_port *pmctx;
3229
3230#if IS_ENABLED(CONFIG_IPV6)
3231 if (mc_router_list == &brmctx->ip6_mc_router_list)
3232 pmctx = hlist_entry(rlist, struct net_bridge_mcast_port,
3233 ip6_rlist);
3234 else
3235#endif
3236 pmctx = hlist_entry(rlist, struct net_bridge_mcast_port,
3237 ip4_rlist);
3238
3239 return pmctx->port;
3240}
3241
3242static struct hlist_node *
3243br_multicast_get_rport_slot(struct net_bridge_mcast *brmctx,
3244 struct net_bridge_port *port,
3245 struct hlist_head *mc_router_list)
3246
3247{
3248 struct hlist_node *slot = NULL;
3249 struct net_bridge_port *p;
3250 struct hlist_node *rlist;
3251
3252 hlist_for_each(rlist, mc_router_list) {
3253 p = br_multicast_rport_from_node(brmctx, mc_router_list, rlist);
3254
3255 if ((unsigned long)port >= (unsigned long)p)
3256 break;
3257
3258 slot = rlist;
3259 }
3260
3261 return slot;
3262}
3263
3264static bool br_multicast_no_router_otherpf(struct net_bridge_mcast_port *pmctx,
3265 struct hlist_node *rnode)
3266{
3267#if IS_ENABLED(CONFIG_IPV6)
3268 if (rnode != &pmctx->ip6_rlist)
3269 return hlist_unhashed(&pmctx->ip6_rlist);
3270 else
3271 return hlist_unhashed(&pmctx->ip4_rlist);
3272#else
3273 return true;
3274#endif
3275}
3276
3277/* Add port to router_list
3278 * list is maintained ordered by pointer value
3279 * and locked by br->multicast_lock and RCU
3280 */
3281static void br_multicast_add_router(struct net_bridge_mcast *brmctx,
3282 struct net_bridge_mcast_port *pmctx,
3283 struct hlist_node *rlist,
3284 struct hlist_head *mc_router_list)
3285{
3286 struct hlist_node *slot;
3287
3288 if (!hlist_unhashed(rlist))
3289 return;
3290
3291 slot = br_multicast_get_rport_slot(brmctx, pmctx->port, mc_router_list);
3292
3293 if (slot)
3294 hlist_add_behind_rcu(rlist, slot);
3295 else
3296 hlist_add_head_rcu(rlist, mc_router_list);
3297
3298 /* For backwards compatibility for now, only notify if we
3299 * switched from no IPv4/IPv6 multicast router to a new
3300 * IPv4 or IPv6 multicast router.
3301 */
3302 if (br_multicast_no_router_otherpf(pmctx, rlist)) {
3303 br_rtr_notify(pmctx->port->br->dev, pmctx, RTM_NEWMDB);
3304 br_port_mc_router_state_change(pmctx->port, true);
3305 }
3306}
3307
3308/* Add port to router_list
3309 * list is maintained ordered by pointer value
3310 * and locked by br->multicast_lock and RCU
3311 */
3312static void br_ip4_multicast_add_router(struct net_bridge_mcast *brmctx,
3313 struct net_bridge_mcast_port *pmctx)
3314{
3315 br_multicast_add_router(brmctx, pmctx, &pmctx->ip4_rlist,
3316 &brmctx->ip4_mc_router_list);
3317}
3318
3319/* Add port to router_list
3320 * list is maintained ordered by pointer value
3321 * and locked by br->multicast_lock and RCU
3322 */
3323static void br_ip6_multicast_add_router(struct net_bridge_mcast *brmctx,
3324 struct net_bridge_mcast_port *pmctx)
3325{
3326#if IS_ENABLED(CONFIG_IPV6)
3327 br_multicast_add_router(brmctx, pmctx, &pmctx->ip6_rlist,
3328 &brmctx->ip6_mc_router_list);
3329#endif
3330}
3331
3332static void br_multicast_mark_router(struct net_bridge_mcast *brmctx,
3333 struct net_bridge_mcast_port *pmctx,
3334 struct timer_list *timer,
3335 struct hlist_node *rlist,
3336 struct hlist_head *mc_router_list)
3337{
3338 unsigned long now = jiffies;
3339
3340 if (!br_multicast_ctx_should_use(brmctx, pmctx))
3341 return;
3342
3343 if (!pmctx) {
3344 if (brmctx->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
3345 if (!br_ip4_multicast_is_router(brmctx) &&
3346 !br_ip6_multicast_is_router(brmctx))
3347 br_mc_router_state_change(brmctx->br, true);
3348 mod_timer(timer, now + brmctx->multicast_querier_interval);
3349 }
3350 return;
3351 }
3352
3353 if (pmctx->multicast_router == MDB_RTR_TYPE_DISABLED ||
3354 pmctx->multicast_router == MDB_RTR_TYPE_PERM)
3355 return;
3356
3357 br_multicast_add_router(brmctx, pmctx, rlist, mc_router_list);
3358 mod_timer(timer, now + brmctx->multicast_querier_interval);
3359}
3360
3361static void br_ip4_multicast_mark_router(struct net_bridge_mcast *brmctx,
3362 struct net_bridge_mcast_port *pmctx)
3363{
3364 struct timer_list *timer = &brmctx->ip4_mc_router_timer;
3365 struct hlist_node *rlist = NULL;
3366
3367 if (pmctx) {
3368 timer = &pmctx->ip4_mc_router_timer;
3369 rlist = &pmctx->ip4_rlist;
3370 }
3371
3372 br_multicast_mark_router(brmctx, pmctx, timer, rlist,
3373 &brmctx->ip4_mc_router_list);
3374}
3375
3376static void br_ip6_multicast_mark_router(struct net_bridge_mcast *brmctx,
3377 struct net_bridge_mcast_port *pmctx)
3378{
3379#if IS_ENABLED(CONFIG_IPV6)
3380 struct timer_list *timer = &brmctx->ip6_mc_router_timer;
3381 struct hlist_node *rlist = NULL;
3382
3383 if (pmctx) {
3384 timer = &pmctx->ip6_mc_router_timer;
3385 rlist = &pmctx->ip6_rlist;
3386 }
3387
3388 br_multicast_mark_router(brmctx, pmctx, timer, rlist,
3389 &brmctx->ip6_mc_router_list);
3390#endif
3391}
3392
3393static void
3394br_ip4_multicast_query_received(struct net_bridge_mcast *brmctx,
3395 struct net_bridge_mcast_port *pmctx,
3396 struct bridge_mcast_other_query *query,
3397 struct br_ip *saddr,
3398 unsigned long max_delay)
3399{
3400 if (!br_multicast_select_querier(brmctx, pmctx, saddr))
3401 return;
3402
3403 br_multicast_update_query_timer(brmctx, query, max_delay);
3404 br_ip4_multicast_mark_router(brmctx, pmctx);
3405}
3406
3407#if IS_ENABLED(CONFIG_IPV6)
3408static void
3409br_ip6_multicast_query_received(struct net_bridge_mcast *brmctx,
3410 struct net_bridge_mcast_port *pmctx,
3411 struct bridge_mcast_other_query *query,
3412 struct br_ip *saddr,
3413 unsigned long max_delay)
3414{
3415 if (!br_multicast_select_querier(brmctx, pmctx, saddr))
3416 return;
3417
3418 br_multicast_update_query_timer(brmctx, query, max_delay);
3419 br_ip6_multicast_mark_router(brmctx, pmctx);
3420}
3421#endif
3422
3423static void br_ip4_multicast_query(struct net_bridge_mcast *brmctx,
3424 struct net_bridge_mcast_port *pmctx,
3425 struct sk_buff *skb,
3426 u16 vid)
3427{
3428 unsigned int transport_len = ip_transport_len(skb);
3429 const struct iphdr *iph = ip_hdr(skb);
3430 struct igmphdr *ih = igmp_hdr(skb);
3431 struct net_bridge_mdb_entry *mp;
3432 struct igmpv3_query *ih3;
3433 struct net_bridge_port_group *p;
3434 struct net_bridge_port_group __rcu **pp;
3435 struct br_ip saddr = {};
3436 unsigned long max_delay;
3437 unsigned long now = jiffies;
3438 __be32 group;
3439
3440 spin_lock(&brmctx->br->multicast_lock);
3441 if (!br_multicast_ctx_should_use(brmctx, pmctx))
3442 goto out;
3443
3444 group = ih->group;
3445
3446 if (transport_len == sizeof(*ih)) {
3447 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
3448
3449 if (!max_delay) {
3450 max_delay = 10 * HZ;
3451 group = 0;
3452 }
3453 } else if (transport_len >= sizeof(*ih3)) {
3454 ih3 = igmpv3_query_hdr(skb);
3455 if (ih3->nsrcs ||
3456 (brmctx->multicast_igmp_version == 3 && group &&
3457 ih3->suppress))
3458 goto out;
3459
3460 max_delay = ih3->code ?
3461 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
3462 } else {
3463 goto out;
3464 }
3465
3466 if (!group) {
3467 saddr.proto = htons(ETH_P_IP);
3468 saddr.src.ip4 = iph->saddr;
3469
3470 br_ip4_multicast_query_received(brmctx, pmctx,
3471 &brmctx->ip4_other_query,
3472 &saddr, max_delay);
3473 goto out;
3474 }
3475
3476 mp = br_mdb_ip4_get(brmctx->br, group, vid);
3477 if (!mp)
3478 goto out;
3479
3480 max_delay *= brmctx->multicast_last_member_count;
3481
3482 if (mp->host_joined &&
3483 (timer_pending(&mp->timer) ?
3484 time_after(mp->timer.expires, now + max_delay) :
3485 try_to_del_timer_sync(&mp->timer) >= 0))
3486 mod_timer(&mp->timer, now + max_delay);
3487
3488 for (pp = &mp->ports;
3489 (p = mlock_dereference(*pp, brmctx->br)) != NULL;
3490 pp = &p->next) {
3491 if (timer_pending(&p->timer) ?
3492 time_after(p->timer.expires, now + max_delay) :
3493 try_to_del_timer_sync(&p->timer) >= 0 &&
3494 (brmctx->multicast_igmp_version == 2 ||
3495 p->filter_mode == MCAST_EXCLUDE))
3496 mod_timer(&p->timer, now + max_delay);
3497 }
3498
3499out:
3500 spin_unlock(&brmctx->br->multicast_lock);
3501}
3502
3503#if IS_ENABLED(CONFIG_IPV6)
3504static int br_ip6_multicast_query(struct net_bridge_mcast *brmctx,
3505 struct net_bridge_mcast_port *pmctx,
3506 struct sk_buff *skb,
3507 u16 vid)
3508{
3509 unsigned int transport_len = ipv6_transport_len(skb);
3510 struct mld_msg *mld;
3511 struct net_bridge_mdb_entry *mp;
3512 struct mld2_query *mld2q;
3513 struct net_bridge_port_group *p;
3514 struct net_bridge_port_group __rcu **pp;
3515 struct br_ip saddr = {};
3516 unsigned long max_delay;
3517 unsigned long now = jiffies;
3518 unsigned int offset = skb_transport_offset(skb);
3519 const struct in6_addr *group = NULL;
3520 bool is_general_query;
3521 int err = 0;
3522
3523 spin_lock(&brmctx->br->multicast_lock);
3524 if (!br_multicast_ctx_should_use(brmctx, pmctx))
3525 goto out;
3526
3527 if (transport_len == sizeof(*mld)) {
3528 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
3529 err = -EINVAL;
3530 goto out;
3531 }
3532 mld = (struct mld_msg *) icmp6_hdr(skb);
3533 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
3534 if (max_delay)
3535 group = &mld->mld_mca;
3536 } else {
3537 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
3538 err = -EINVAL;
3539 goto out;
3540 }
3541 mld2q = (struct mld2_query *)icmp6_hdr(skb);
3542 if (!mld2q->mld2q_nsrcs)
3543 group = &mld2q->mld2q_mca;
3544 if (brmctx->multicast_mld_version == 2 &&
3545 !ipv6_addr_any(&mld2q->mld2q_mca) &&
3546 mld2q->mld2q_suppress)
3547 goto out;
3548
3549 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
3550 }
3551
3552 is_general_query = group && ipv6_addr_any(group);
3553
3554 if (is_general_query) {
3555 saddr.proto = htons(ETH_P_IPV6);
3556 saddr.src.ip6 = ipv6_hdr(skb)->saddr;
3557
3558 br_ip6_multicast_query_received(brmctx, pmctx,
3559 &brmctx->ip6_other_query,
3560 &saddr, max_delay);
3561 goto out;
3562 } else if (!group) {
3563 goto out;
3564 }
3565
3566 mp = br_mdb_ip6_get(brmctx->br, group, vid);
3567 if (!mp)
3568 goto out;
3569
3570 max_delay *= brmctx->multicast_last_member_count;
3571 if (mp->host_joined &&
3572 (timer_pending(&mp->timer) ?
3573 time_after(mp->timer.expires, now + max_delay) :
3574 try_to_del_timer_sync(&mp->timer) >= 0))
3575 mod_timer(&mp->timer, now + max_delay);
3576
3577 for (pp = &mp->ports;
3578 (p = mlock_dereference(*pp, brmctx->br)) != NULL;
3579 pp = &p->next) {
3580 if (timer_pending(&p->timer) ?
3581 time_after(p->timer.expires, now + max_delay) :
3582 try_to_del_timer_sync(&p->timer) >= 0 &&
3583 (brmctx->multicast_mld_version == 1 ||
3584 p->filter_mode == MCAST_EXCLUDE))
3585 mod_timer(&p->timer, now + max_delay);
3586 }
3587
3588out:
3589 spin_unlock(&brmctx->br->multicast_lock);
3590 return err;
3591}
3592#endif
3593
3594static void
3595br_multicast_leave_group(struct net_bridge_mcast *brmctx,
3596 struct net_bridge_mcast_port *pmctx,
3597 struct br_ip *group,
3598 struct bridge_mcast_other_query *other_query,
3599 struct bridge_mcast_own_query *own_query,
3600 const unsigned char *src)
3601{
3602 struct net_bridge_mdb_entry *mp;
3603 struct net_bridge_port_group *p;
3604 unsigned long now;
3605 unsigned long time;
3606
3607 spin_lock(&brmctx->br->multicast_lock);
3608 if (!br_multicast_ctx_should_use(brmctx, pmctx))
3609 goto out;
3610
3611 mp = br_mdb_ip_get(brmctx->br, group);
3612 if (!mp)
3613 goto out;
3614
3615 if (pmctx && (pmctx->port->flags & BR_MULTICAST_FAST_LEAVE)) {
3616 struct net_bridge_port_group __rcu **pp;
3617
3618 for (pp = &mp->ports;
3619 (p = mlock_dereference(*pp, brmctx->br)) != NULL;
3620 pp = &p->next) {
3621 if (!br_port_group_equal(p, pmctx->port, src))
3622 continue;
3623
3624 if (p->flags & MDB_PG_FLAGS_PERMANENT)
3625 break;
3626
3627 p->flags |= MDB_PG_FLAGS_FAST_LEAVE;
3628 br_multicast_del_pg(mp, p, pp);
3629 }
3630 goto out;
3631 }
3632
3633 if (timer_pending(&other_query->timer))
3634 goto out;
3635
3636 if (brmctx->multicast_querier) {
3637 __br_multicast_send_query(brmctx, pmctx, NULL, NULL, &mp->addr,
3638 false, 0, NULL);
3639
3640 time = jiffies + brmctx->multicast_last_member_count *
3641 brmctx->multicast_last_member_interval;
3642
3643 mod_timer(&own_query->timer, time);
3644
3645 for (p = mlock_dereference(mp->ports, brmctx->br);
3646 p != NULL && pmctx != NULL;
3647 p = mlock_dereference(p->next, brmctx->br)) {
3648 if (!br_port_group_equal(p, pmctx->port, src))
3649 continue;
3650
3651 if (!hlist_unhashed(&p->mglist) &&
3652 (timer_pending(&p->timer) ?
3653 time_after(p->timer.expires, time) :
3654 try_to_del_timer_sync(&p->timer) >= 0)) {
3655 mod_timer(&p->timer, time);
3656 }
3657
3658 break;
3659 }
3660 }
3661
3662 now = jiffies;
3663 time = now + brmctx->multicast_last_member_count *
3664 brmctx->multicast_last_member_interval;
3665
3666 if (!pmctx) {
3667 if (mp->host_joined &&
3668 (timer_pending(&mp->timer) ?
3669 time_after(mp->timer.expires, time) :
3670 try_to_del_timer_sync(&mp->timer) >= 0)) {
3671 mod_timer(&mp->timer, time);
3672 }
3673
3674 goto out;
3675 }
3676
3677 for (p = mlock_dereference(mp->ports, brmctx->br);
3678 p != NULL;
3679 p = mlock_dereference(p->next, brmctx->br)) {
3680 if (p->key.port != pmctx->port)
3681 continue;
3682
3683 if (!hlist_unhashed(&p->mglist) &&
3684 (timer_pending(&p->timer) ?
3685 time_after(p->timer.expires, time) :
3686 try_to_del_timer_sync(&p->timer) >= 0)) {
3687 mod_timer(&p->timer, time);
3688 }
3689
3690 break;
3691 }
3692out:
3693 spin_unlock(&brmctx->br->multicast_lock);
3694}
3695
3696static void br_ip4_multicast_leave_group(struct net_bridge_mcast *brmctx,
3697 struct net_bridge_mcast_port *pmctx,
3698 __be32 group,
3699 __u16 vid,
3700 const unsigned char *src)
3701{
3702 struct br_ip br_group;
3703 struct bridge_mcast_own_query *own_query;
3704
3705 if (ipv4_is_local_multicast(group))
3706 return;
3707
3708 own_query = pmctx ? &pmctx->ip4_own_query : &brmctx->ip4_own_query;
3709
3710 memset(&br_group, 0, sizeof(br_group));
3711 br_group.dst.ip4 = group;
3712 br_group.proto = htons(ETH_P_IP);
3713 br_group.vid = vid;
3714
3715 br_multicast_leave_group(brmctx, pmctx, &br_group,
3716 &brmctx->ip4_other_query,
3717 own_query, src);
3718}
3719
3720#if IS_ENABLED(CONFIG_IPV6)
3721static void br_ip6_multicast_leave_group(struct net_bridge_mcast *brmctx,
3722 struct net_bridge_mcast_port *pmctx,
3723 const struct in6_addr *group,
3724 __u16 vid,
3725 const unsigned char *src)
3726{
3727 struct br_ip br_group;
3728 struct bridge_mcast_own_query *own_query;
3729
3730 if (ipv6_addr_is_ll_all_nodes(group))
3731 return;
3732
3733 own_query = pmctx ? &pmctx->ip6_own_query : &brmctx->ip6_own_query;
3734
3735 memset(&br_group, 0, sizeof(br_group));
3736 br_group.dst.ip6 = *group;
3737 br_group.proto = htons(ETH_P_IPV6);
3738 br_group.vid = vid;
3739
3740 br_multicast_leave_group(brmctx, pmctx, &br_group,
3741 &brmctx->ip6_other_query,
3742 own_query, src);
3743}
3744#endif
3745
3746static void br_multicast_err_count(const struct net_bridge *br,
3747 const struct net_bridge_port *p,
3748 __be16 proto)
3749{
3750 struct bridge_mcast_stats __percpu *stats;
3751 struct bridge_mcast_stats *pstats;
3752
3753 if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
3754 return;
3755
3756 if (p)
3757 stats = p->mcast_stats;
3758 else
3759 stats = br->mcast_stats;
3760 if (WARN_ON(!stats))
3761 return;
3762
3763 pstats = this_cpu_ptr(stats);
3764
3765 u64_stats_update_begin(&pstats->syncp);
3766 switch (proto) {
3767 case htons(ETH_P_IP):
3768 pstats->mstats.igmp_parse_errors++;
3769 break;
3770#if IS_ENABLED(CONFIG_IPV6)
3771 case htons(ETH_P_IPV6):
3772 pstats->mstats.mld_parse_errors++;
3773 break;
3774#endif
3775 }
3776 u64_stats_update_end(&pstats->syncp);
3777}
3778
3779static void br_multicast_pim(struct net_bridge_mcast *brmctx,
3780 struct net_bridge_mcast_port *pmctx,
3781 const struct sk_buff *skb)
3782{
3783 unsigned int offset = skb_transport_offset(skb);
3784 struct pimhdr *pimhdr, _pimhdr;
3785
3786 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
3787 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
3788 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
3789 return;
3790
3791 spin_lock(&brmctx->br->multicast_lock);
3792 br_ip4_multicast_mark_router(brmctx, pmctx);
3793 spin_unlock(&brmctx->br->multicast_lock);
3794}
3795
3796static int br_ip4_multicast_mrd_rcv(struct net_bridge_mcast *brmctx,
3797 struct net_bridge_mcast_port *pmctx,
3798 struct sk_buff *skb)
3799{
3800 if (ip_hdr(skb)->protocol != IPPROTO_IGMP ||
3801 igmp_hdr(skb)->type != IGMP_MRDISC_ADV)
3802 return -ENOMSG;
3803
3804 spin_lock(&brmctx->br->multicast_lock);
3805 br_ip4_multicast_mark_router(brmctx, pmctx);
3806 spin_unlock(&brmctx->br->multicast_lock);
3807
3808 return 0;
3809}
3810
3811static int br_multicast_ipv4_rcv(struct net_bridge_mcast *brmctx,
3812 struct net_bridge_mcast_port *pmctx,
3813 struct sk_buff *skb,
3814 u16 vid)
3815{
3816 struct net_bridge_port *p = pmctx ? pmctx->port : NULL;
3817 const unsigned char *src;
3818 struct igmphdr *ih;
3819 int err;
3820
3821 err = ip_mc_check_igmp(skb);
3822
3823 if (err == -ENOMSG) {
3824 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
3825 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
3826 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
3827 if (ip_hdr(skb)->protocol == IPPROTO_PIM)
3828 br_multicast_pim(brmctx, pmctx, skb);
3829 } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) {
3830 br_ip4_multicast_mrd_rcv(brmctx, pmctx, skb);
3831 }
3832
3833 return 0;
3834 } else if (err < 0) {
3835 br_multicast_err_count(brmctx->br, p, skb->protocol);
3836 return err;
3837 }
3838
3839 ih = igmp_hdr(skb);
3840 src = eth_hdr(skb)->h_source;
3841 BR_INPUT_SKB_CB(skb)->igmp = ih->type;
3842
3843 switch (ih->type) {
3844 case IGMP_HOST_MEMBERSHIP_REPORT:
3845 case IGMPV2_HOST_MEMBERSHIP_REPORT:
3846 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
3847 err = br_ip4_multicast_add_group(brmctx, pmctx, ih->group, vid,
3848 src, true);
3849 break;
3850 case IGMPV3_HOST_MEMBERSHIP_REPORT:
3851 err = br_ip4_multicast_igmp3_report(brmctx, pmctx, skb, vid);
3852 break;
3853 case IGMP_HOST_MEMBERSHIP_QUERY:
3854 br_ip4_multicast_query(brmctx, pmctx, skb, vid);
3855 break;
3856 case IGMP_HOST_LEAVE_MESSAGE:
3857 br_ip4_multicast_leave_group(brmctx, pmctx, ih->group, vid, src);
3858 break;
3859 }
3860
3861 br_multicast_count(brmctx->br, p, skb, BR_INPUT_SKB_CB(skb)->igmp,
3862 BR_MCAST_DIR_RX);
3863
3864 return err;
3865}
3866
3867#if IS_ENABLED(CONFIG_IPV6)
3868static void br_ip6_multicast_mrd_rcv(struct net_bridge_mcast *brmctx,
3869 struct net_bridge_mcast_port *pmctx,
3870 struct sk_buff *skb)
3871{
3872 if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV)
3873 return;
3874
3875 spin_lock(&brmctx->br->multicast_lock);
3876 br_ip6_multicast_mark_router(brmctx, pmctx);
3877 spin_unlock(&brmctx->br->multicast_lock);
3878}
3879
3880static int br_multicast_ipv6_rcv(struct net_bridge_mcast *brmctx,
3881 struct net_bridge_mcast_port *pmctx,
3882 struct sk_buff *skb,
3883 u16 vid)
3884{
3885 struct net_bridge_port *p = pmctx ? pmctx->port : NULL;
3886 const unsigned char *src;
3887 struct mld_msg *mld;
3888 int err;
3889
3890 err = ipv6_mc_check_mld(skb);
3891
3892 if (err == -ENOMSG || err == -ENODATA) {
3893 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
3894 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
3895 if (err == -ENODATA &&
3896 ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr))
3897 br_ip6_multicast_mrd_rcv(brmctx, pmctx, skb);
3898
3899 return 0;
3900 } else if (err < 0) {
3901 br_multicast_err_count(brmctx->br, p, skb->protocol);
3902 return err;
3903 }
3904
3905 mld = (struct mld_msg *)skb_transport_header(skb);
3906 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
3907
3908 switch (mld->mld_type) {
3909 case ICMPV6_MGM_REPORT:
3910 src = eth_hdr(skb)->h_source;
3911 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
3912 err = br_ip6_multicast_add_group(brmctx, pmctx, &mld->mld_mca,
3913 vid, src, true);
3914 break;
3915 case ICMPV6_MLD2_REPORT:
3916 err = br_ip6_multicast_mld2_report(brmctx, pmctx, skb, vid);
3917 break;
3918 case ICMPV6_MGM_QUERY:
3919 err = br_ip6_multicast_query(brmctx, pmctx, skb, vid);
3920 break;
3921 case ICMPV6_MGM_REDUCTION:
3922 src = eth_hdr(skb)->h_source;
3923 br_ip6_multicast_leave_group(brmctx, pmctx, &mld->mld_mca, vid,
3924 src);
3925 break;
3926 }
3927
3928 br_multicast_count(brmctx->br, p, skb, BR_INPUT_SKB_CB(skb)->igmp,
3929 BR_MCAST_DIR_RX);
3930
3931 return err;
3932}
3933#endif
3934
3935int br_multicast_rcv(struct net_bridge_mcast **brmctx,
3936 struct net_bridge_mcast_port **pmctx,
3937 struct net_bridge_vlan *vlan,
3938 struct sk_buff *skb, u16 vid)
3939{
3940 int ret = 0;
3941
3942 BR_INPUT_SKB_CB(skb)->igmp = 0;
3943 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
3944
3945 if (!br_opt_get((*brmctx)->br, BROPT_MULTICAST_ENABLED))
3946 return 0;
3947
3948 if (br_opt_get((*brmctx)->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) && vlan) {
3949 const struct net_bridge_vlan *masterv;
3950
3951 /* the vlan has the master flag set only when transmitting
3952 * through the bridge device
3953 */
3954 if (br_vlan_is_master(vlan)) {
3955 masterv = vlan;
3956 *brmctx = &vlan->br_mcast_ctx;
3957 *pmctx = NULL;
3958 } else {
3959 masterv = vlan->brvlan;
3960 *brmctx = &vlan->brvlan->br_mcast_ctx;
3961 *pmctx = &vlan->port_mcast_ctx;
3962 }
3963
3964 if (!(masterv->priv_flags & BR_VLFLAG_GLOBAL_MCAST_ENABLED))
3965 return 0;
3966 }
3967
3968 switch (skb->protocol) {
3969 case htons(ETH_P_IP):
3970 ret = br_multicast_ipv4_rcv(*brmctx, *pmctx, skb, vid);
3971 break;
3972#if IS_ENABLED(CONFIG_IPV6)
3973 case htons(ETH_P_IPV6):
3974 ret = br_multicast_ipv6_rcv(*brmctx, *pmctx, skb, vid);
3975 break;
3976#endif
3977 }
3978
3979 return ret;
3980}
3981
3982static void br_multicast_query_expired(struct net_bridge_mcast *brmctx,
3983 struct bridge_mcast_own_query *query,
3984 struct bridge_mcast_querier *querier)
3985{
3986 spin_lock(&brmctx->br->multicast_lock);
3987 if (br_multicast_ctx_vlan_disabled(brmctx))
3988 goto out;
3989
3990 if (query->startup_sent < brmctx->multicast_startup_query_count)
3991 query->startup_sent++;
3992
3993 br_multicast_send_query(brmctx, NULL, query);
3994out:
3995 spin_unlock(&brmctx->br->multicast_lock);
3996}
3997
3998static void br_ip4_multicast_query_expired(struct timer_list *t)
3999{
4000 struct net_bridge_mcast *brmctx = from_timer(brmctx, t,
4001 ip4_own_query.timer);
4002
4003 br_multicast_query_expired(brmctx, &brmctx->ip4_own_query,
4004 &brmctx->ip4_querier);
4005}
4006
4007#if IS_ENABLED(CONFIG_IPV6)
4008static void br_ip6_multicast_query_expired(struct timer_list *t)
4009{
4010 struct net_bridge_mcast *brmctx = from_timer(brmctx, t,
4011 ip6_own_query.timer);
4012
4013 br_multicast_query_expired(brmctx, &brmctx->ip6_own_query,
4014 &brmctx->ip6_querier);
4015}
4016#endif
4017
4018static void br_multicast_gc_work(struct work_struct *work)
4019{
4020 struct net_bridge *br = container_of(work, struct net_bridge,
4021 mcast_gc_work);
4022 HLIST_HEAD(deleted_head);
4023
4024 spin_lock_bh(&br->multicast_lock);
4025 hlist_move_list(&br->mcast_gc_list, &deleted_head);
4026 spin_unlock_bh(&br->multicast_lock);
4027
4028 br_multicast_gc(&deleted_head);
4029}
4030
4031void br_multicast_ctx_init(struct net_bridge *br,
4032 struct net_bridge_vlan *vlan,
4033 struct net_bridge_mcast *brmctx)
4034{
4035 brmctx->br = br;
4036 brmctx->vlan = vlan;
4037 brmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
4038 brmctx->multicast_last_member_count = 2;
4039 brmctx->multicast_startup_query_count = 2;
4040
4041 brmctx->multicast_last_member_interval = HZ;
4042 brmctx->multicast_query_response_interval = 10 * HZ;
4043 brmctx->multicast_startup_query_interval = 125 * HZ / 4;
4044 brmctx->multicast_query_interval = 125 * HZ;
4045 brmctx->multicast_querier_interval = 255 * HZ;
4046 brmctx->multicast_membership_interval = 260 * HZ;
4047
4048 brmctx->ip4_querier.port_ifidx = 0;
4049 seqcount_spinlock_init(&brmctx->ip4_querier.seq, &br->multicast_lock);
4050 brmctx->multicast_igmp_version = 2;
4051#if IS_ENABLED(CONFIG_IPV6)
4052 brmctx->multicast_mld_version = 1;
4053 brmctx->ip6_querier.port_ifidx = 0;
4054 seqcount_spinlock_init(&brmctx->ip6_querier.seq, &br->multicast_lock);
4055#endif
4056
4057 timer_setup(&brmctx->ip4_mc_router_timer,
4058 br_ip4_multicast_local_router_expired, 0);
4059 timer_setup(&brmctx->ip4_other_query.timer,
4060 br_ip4_multicast_querier_expired, 0);
4061 timer_setup(&brmctx->ip4_other_query.delay_timer,
4062 br_multicast_query_delay_expired, 0);
4063 timer_setup(&brmctx->ip4_own_query.timer,
4064 br_ip4_multicast_query_expired, 0);
4065#if IS_ENABLED(CONFIG_IPV6)
4066 timer_setup(&brmctx->ip6_mc_router_timer,
4067 br_ip6_multicast_local_router_expired, 0);
4068 timer_setup(&brmctx->ip6_other_query.timer,
4069 br_ip6_multicast_querier_expired, 0);
4070 timer_setup(&brmctx->ip6_other_query.delay_timer,
4071 br_multicast_query_delay_expired, 0);
4072 timer_setup(&brmctx->ip6_own_query.timer,
4073 br_ip6_multicast_query_expired, 0);
4074#endif
4075}
4076
4077void br_multicast_ctx_deinit(struct net_bridge_mcast *brmctx)
4078{
4079 __br_multicast_stop(brmctx);
4080}
4081
4082void br_multicast_init(struct net_bridge *br)
4083{
4084 br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX;
4085
4086 br_multicast_ctx_init(br, NULL, &br->multicast_ctx);
4087
4088 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true);
4089 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
4090
4091 spin_lock_init(&br->multicast_lock);
4092 INIT_HLIST_HEAD(&br->mdb_list);
4093 INIT_HLIST_HEAD(&br->mcast_gc_list);
4094 INIT_WORK(&br->mcast_gc_work, br_multicast_gc_work);
4095}
4096
4097static void br_ip4_multicast_join_snoopers(struct net_bridge *br)
4098{
4099 struct in_device *in_dev = in_dev_get(br->dev);
4100
4101 if (!in_dev)
4102 return;
4103
4104 __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
4105 in_dev_put(in_dev);
4106}
4107
4108#if IS_ENABLED(CONFIG_IPV6)
4109static void br_ip6_multicast_join_snoopers(struct net_bridge *br)
4110{
4111 struct in6_addr addr;
4112
4113 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
4114 ipv6_dev_mc_inc(br->dev, &addr);
4115}
4116#else
4117static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br)
4118{
4119}
4120#endif
4121
4122void br_multicast_join_snoopers(struct net_bridge *br)
4123{
4124 br_ip4_multicast_join_snoopers(br);
4125 br_ip6_multicast_join_snoopers(br);
4126}
4127
4128static void br_ip4_multicast_leave_snoopers(struct net_bridge *br)
4129{
4130 struct in_device *in_dev = in_dev_get(br->dev);
4131
4132 if (WARN_ON(!in_dev))
4133 return;
4134
4135 __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
4136 in_dev_put(in_dev);
4137}
4138
4139#if IS_ENABLED(CONFIG_IPV6)
4140static void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
4141{
4142 struct in6_addr addr;
4143
4144 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
4145 ipv6_dev_mc_dec(br->dev, &addr);
4146}
4147#else
4148static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
4149{
4150}
4151#endif
4152
4153void br_multicast_leave_snoopers(struct net_bridge *br)
4154{
4155 br_ip4_multicast_leave_snoopers(br);
4156 br_ip6_multicast_leave_snoopers(br);
4157}
4158
4159static void __br_multicast_open_query(struct net_bridge *br,
4160 struct bridge_mcast_own_query *query)
4161{
4162 query->startup_sent = 0;
4163
4164 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
4165 return;
4166
4167 mod_timer(&query->timer, jiffies);
4168}
4169
4170static void __br_multicast_open(struct net_bridge_mcast *brmctx)
4171{
4172 __br_multicast_open_query(brmctx->br, &brmctx->ip4_own_query);
4173#if IS_ENABLED(CONFIG_IPV6)
4174 __br_multicast_open_query(brmctx->br, &brmctx->ip6_own_query);
4175#endif
4176}
4177
4178void br_multicast_open(struct net_bridge *br)
4179{
4180 ASSERT_RTNL();
4181
4182 if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) {
4183 struct net_bridge_vlan_group *vg;
4184 struct net_bridge_vlan *vlan;
4185
4186 vg = br_vlan_group(br);
4187 if (vg) {
4188 list_for_each_entry(vlan, &vg->vlan_list, vlist) {
4189 struct net_bridge_mcast *brmctx;
4190
4191 brmctx = &vlan->br_mcast_ctx;
4192 if (br_vlan_is_brentry(vlan) &&
4193 !br_multicast_ctx_vlan_disabled(brmctx))
4194 __br_multicast_open(&vlan->br_mcast_ctx);
4195 }
4196 }
4197 } else {
4198 __br_multicast_open(&br->multicast_ctx);
4199 }
4200}
4201
4202static void __br_multicast_stop(struct net_bridge_mcast *brmctx)
4203{
4204 del_timer_sync(&brmctx->ip4_mc_router_timer);
4205 del_timer_sync(&brmctx->ip4_other_query.timer);
4206 del_timer_sync(&brmctx->ip4_other_query.delay_timer);
4207 del_timer_sync(&brmctx->ip4_own_query.timer);
4208#if IS_ENABLED(CONFIG_IPV6)
4209 del_timer_sync(&brmctx->ip6_mc_router_timer);
4210 del_timer_sync(&brmctx->ip6_other_query.timer);
4211 del_timer_sync(&brmctx->ip6_other_query.delay_timer);
4212 del_timer_sync(&brmctx->ip6_own_query.timer);
4213#endif
4214}
4215
4216void br_multicast_toggle_one_vlan(struct net_bridge_vlan *vlan, bool on)
4217{
4218 struct net_bridge *br;
4219
4220 /* it's okay to check for the flag without the multicast lock because it
4221 * can only change under RTNL -> multicast_lock, we need the latter to
4222 * sync with timers and packets
4223 */
4224 if (on == !!(vlan->priv_flags & BR_VLFLAG_MCAST_ENABLED))
4225 return;
4226
4227 if (br_vlan_is_master(vlan)) {
4228 br = vlan->br;
4229
4230 if (!br_vlan_is_brentry(vlan) ||
4231 (on &&
4232 br_multicast_ctx_vlan_global_disabled(&vlan->br_mcast_ctx)))
4233 return;
4234
4235 spin_lock_bh(&br->multicast_lock);
4236 vlan->priv_flags ^= BR_VLFLAG_MCAST_ENABLED;
4237 spin_unlock_bh(&br->multicast_lock);
4238
4239 if (on)
4240 __br_multicast_open(&vlan->br_mcast_ctx);
4241 else
4242 __br_multicast_stop(&vlan->br_mcast_ctx);
4243 } else {
4244 struct net_bridge_mcast *brmctx;
4245
4246 brmctx = br_multicast_port_ctx_get_global(&vlan->port_mcast_ctx);
4247 if (on && br_multicast_ctx_vlan_global_disabled(brmctx))
4248 return;
4249
4250 br = vlan->port->br;
4251 spin_lock_bh(&br->multicast_lock);
4252 vlan->priv_flags ^= BR_VLFLAG_MCAST_ENABLED;
4253 if (on)
4254 __br_multicast_enable_port_ctx(&vlan->port_mcast_ctx);
4255 else
4256 __br_multicast_disable_port_ctx(&vlan->port_mcast_ctx);
4257 spin_unlock_bh(&br->multicast_lock);
4258 }
4259}
4260
4261static void br_multicast_toggle_vlan(struct net_bridge_vlan *vlan, bool on)
4262{
4263 struct net_bridge_port *p;
4264
4265 if (WARN_ON_ONCE(!br_vlan_is_master(vlan)))
4266 return;
4267
4268 list_for_each_entry(p, &vlan->br->port_list, list) {
4269 struct net_bridge_vlan *vport;
4270
4271 vport = br_vlan_find(nbp_vlan_group(p), vlan->vid);
4272 if (!vport)
4273 continue;
4274 br_multicast_toggle_one_vlan(vport, on);
4275 }
4276
4277 if (br_vlan_is_brentry(vlan))
4278 br_multicast_toggle_one_vlan(vlan, on);
4279}
4280
4281int br_multicast_toggle_vlan_snooping(struct net_bridge *br, bool on,
4282 struct netlink_ext_ack *extack)
4283{
4284 struct net_bridge_vlan_group *vg;
4285 struct net_bridge_vlan *vlan;
4286 struct net_bridge_port *p;
4287
4288 if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) == on)
4289 return 0;
4290
4291 if (on && !br_opt_get(br, BROPT_VLAN_ENABLED)) {
4292 NL_SET_ERR_MSG_MOD(extack, "Cannot enable multicast vlan snooping with vlan filtering disabled");
4293 return -EINVAL;
4294 }
4295
4296 vg = br_vlan_group(br);
4297 if (!vg)
4298 return 0;
4299
4300 br_opt_toggle(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED, on);
4301
4302 /* disable/enable non-vlan mcast contexts based on vlan snooping */
4303 if (on)
4304 __br_multicast_stop(&br->multicast_ctx);
4305 else
4306 __br_multicast_open(&br->multicast_ctx);
4307 list_for_each_entry(p, &br->port_list, list) {
4308 if (on)
4309 br_multicast_disable_port(p);
4310 else
4311 br_multicast_enable_port(p);
4312 }
4313
4314 list_for_each_entry(vlan, &vg->vlan_list, vlist)
4315 br_multicast_toggle_vlan(vlan, on);
4316
4317 return 0;
4318}
4319
4320bool br_multicast_toggle_global_vlan(struct net_bridge_vlan *vlan, bool on)
4321{
4322 ASSERT_RTNL();
4323
4324 /* BR_VLFLAG_GLOBAL_MCAST_ENABLED relies on eventual consistency and
4325 * requires only RTNL to change
4326 */
4327 if (on == !!(vlan->priv_flags & BR_VLFLAG_GLOBAL_MCAST_ENABLED))
4328 return false;
4329
4330 vlan->priv_flags ^= BR_VLFLAG_GLOBAL_MCAST_ENABLED;
4331 br_multicast_toggle_vlan(vlan, on);
4332
4333 return true;
4334}
4335
4336void br_multicast_stop(struct net_bridge *br)
4337{
4338 ASSERT_RTNL();
4339
4340 if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) {
4341 struct net_bridge_vlan_group *vg;
4342 struct net_bridge_vlan *vlan;
4343
4344 vg = br_vlan_group(br);
4345 if (vg) {
4346 list_for_each_entry(vlan, &vg->vlan_list, vlist) {
4347 struct net_bridge_mcast *brmctx;
4348
4349 brmctx = &vlan->br_mcast_ctx;
4350 if (br_vlan_is_brentry(vlan) &&
4351 !br_multicast_ctx_vlan_disabled(brmctx))
4352 __br_multicast_stop(&vlan->br_mcast_ctx);
4353 }
4354 }
4355 } else {
4356 __br_multicast_stop(&br->multicast_ctx);
4357 }
4358}
4359
4360void br_multicast_dev_del(struct net_bridge *br)
4361{
4362 struct net_bridge_mdb_entry *mp;
4363 HLIST_HEAD(deleted_head);
4364 struct hlist_node *tmp;
4365
4366 spin_lock_bh(&br->multicast_lock);
4367 hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node)
4368 br_multicast_del_mdb_entry(mp);
4369 hlist_move_list(&br->mcast_gc_list, &deleted_head);
4370 spin_unlock_bh(&br->multicast_lock);
4371
4372 br_multicast_ctx_deinit(&br->multicast_ctx);
4373 br_multicast_gc(&deleted_head);
4374 cancel_work_sync(&br->mcast_gc_work);
4375
4376 rcu_barrier();
4377}
4378
4379int br_multicast_set_router(struct net_bridge_mcast *brmctx, unsigned long val)
4380{
4381 int err = -EINVAL;
4382
4383 spin_lock_bh(&brmctx->br->multicast_lock);
4384
4385 switch (val) {
4386 case MDB_RTR_TYPE_DISABLED:
4387 case MDB_RTR_TYPE_PERM:
4388 br_mc_router_state_change(brmctx->br, val == MDB_RTR_TYPE_PERM);
4389 del_timer(&brmctx->ip4_mc_router_timer);
4390#if IS_ENABLED(CONFIG_IPV6)
4391 del_timer(&brmctx->ip6_mc_router_timer);
4392#endif
4393 brmctx->multicast_router = val;
4394 err = 0;
4395 break;
4396 case MDB_RTR_TYPE_TEMP_QUERY:
4397 if (brmctx->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
4398 br_mc_router_state_change(brmctx->br, false);
4399 brmctx->multicast_router = val;
4400 err = 0;
4401 break;
4402 }
4403
4404 spin_unlock_bh(&brmctx->br->multicast_lock);
4405
4406 return err;
4407}
4408
4409static void
4410br_multicast_rport_del_notify(struct net_bridge_mcast_port *pmctx, bool deleted)
4411{
4412 if (!deleted)
4413 return;
4414
4415 /* For backwards compatibility for now, only notify if there is
4416 * no multicast router anymore for both IPv4 and IPv6.
4417 */
4418 if (!hlist_unhashed(&pmctx->ip4_rlist))
4419 return;
4420#if IS_ENABLED(CONFIG_IPV6)
4421 if (!hlist_unhashed(&pmctx->ip6_rlist))
4422 return;
4423#endif
4424
4425 br_rtr_notify(pmctx->port->br->dev, pmctx, RTM_DELMDB);
4426 br_port_mc_router_state_change(pmctx->port, false);
4427
4428 /* don't allow timer refresh */
4429 if (pmctx->multicast_router == MDB_RTR_TYPE_TEMP)
4430 pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
4431}
4432
4433int br_multicast_set_port_router(struct net_bridge_mcast_port *pmctx,
4434 unsigned long val)
4435{
4436 struct net_bridge_mcast *brmctx;
4437 unsigned long now = jiffies;
4438 int err = -EINVAL;
4439 bool del = false;
4440
4441 brmctx = br_multicast_port_ctx_get_global(pmctx);
4442 spin_lock_bh(&brmctx->br->multicast_lock);
4443 if (pmctx->multicast_router == val) {
4444 /* Refresh the temp router port timer */
4445 if (pmctx->multicast_router == MDB_RTR_TYPE_TEMP) {
4446 mod_timer(&pmctx->ip4_mc_router_timer,
4447 now + brmctx->multicast_querier_interval);
4448#if IS_ENABLED(CONFIG_IPV6)
4449 mod_timer(&pmctx->ip6_mc_router_timer,
4450 now + brmctx->multicast_querier_interval);
4451#endif
4452 }
4453 err = 0;
4454 goto unlock;
4455 }
4456 switch (val) {
4457 case MDB_RTR_TYPE_DISABLED:
4458 pmctx->multicast_router = MDB_RTR_TYPE_DISABLED;
4459 del |= br_ip4_multicast_rport_del(pmctx);
4460 del_timer(&pmctx->ip4_mc_router_timer);
4461 del |= br_ip6_multicast_rport_del(pmctx);
4462#if IS_ENABLED(CONFIG_IPV6)
4463 del_timer(&pmctx->ip6_mc_router_timer);
4464#endif
4465 br_multicast_rport_del_notify(pmctx, del);
4466 break;
4467 case MDB_RTR_TYPE_TEMP_QUERY:
4468 pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
4469 del |= br_ip4_multicast_rport_del(pmctx);
4470 del |= br_ip6_multicast_rport_del(pmctx);
4471 br_multicast_rport_del_notify(pmctx, del);
4472 break;
4473 case MDB_RTR_TYPE_PERM:
4474 pmctx->multicast_router = MDB_RTR_TYPE_PERM;
4475 del_timer(&pmctx->ip4_mc_router_timer);
4476 br_ip4_multicast_add_router(brmctx, pmctx);
4477#if IS_ENABLED(CONFIG_IPV6)
4478 del_timer(&pmctx->ip6_mc_router_timer);
4479#endif
4480 br_ip6_multicast_add_router(brmctx, pmctx);
4481 break;
4482 case MDB_RTR_TYPE_TEMP:
4483 pmctx->multicast_router = MDB_RTR_TYPE_TEMP;
4484 br_ip4_multicast_mark_router(brmctx, pmctx);
4485 br_ip6_multicast_mark_router(brmctx, pmctx);
4486 break;
4487 default:
4488 goto unlock;
4489 }
4490 err = 0;
4491unlock:
4492 spin_unlock_bh(&brmctx->br->multicast_lock);
4493
4494 return err;
4495}
4496
4497int br_multicast_set_vlan_router(struct net_bridge_vlan *v, u8 mcast_router)
4498{
4499 int err;
4500
4501 if (br_vlan_is_master(v))
4502 err = br_multicast_set_router(&v->br_mcast_ctx, mcast_router);
4503 else
4504 err = br_multicast_set_port_router(&v->port_mcast_ctx,
4505 mcast_router);
4506
4507 return err;
4508}
4509
4510static void br_multicast_start_querier(struct net_bridge_mcast *brmctx,
4511 struct bridge_mcast_own_query *query)
4512{
4513 struct net_bridge_port *port;
4514
4515 if (!br_multicast_ctx_matches_vlan_snooping(brmctx))
4516 return;
4517
4518 __br_multicast_open_query(brmctx->br, query);
4519
4520 rcu_read_lock();
4521 list_for_each_entry_rcu(port, &brmctx->br->port_list, list) {
4522 struct bridge_mcast_own_query *ip4_own_query;
4523#if IS_ENABLED(CONFIG_IPV6)
4524 struct bridge_mcast_own_query *ip6_own_query;
4525#endif
4526
4527 if (br_multicast_port_ctx_state_stopped(&port->multicast_ctx))
4528 continue;
4529
4530 if (br_multicast_ctx_is_vlan(brmctx)) {
4531 struct net_bridge_vlan *vlan;
4532
4533 vlan = br_vlan_find(nbp_vlan_group_rcu(port),
4534 brmctx->vlan->vid);
4535 if (!vlan ||
4536 br_multicast_port_ctx_state_stopped(&vlan->port_mcast_ctx))
4537 continue;
4538
4539 ip4_own_query = &vlan->port_mcast_ctx.ip4_own_query;
4540#if IS_ENABLED(CONFIG_IPV6)
4541 ip6_own_query = &vlan->port_mcast_ctx.ip6_own_query;
4542#endif
4543 } else {
4544 ip4_own_query = &port->multicast_ctx.ip4_own_query;
4545#if IS_ENABLED(CONFIG_IPV6)
4546 ip6_own_query = &port->multicast_ctx.ip6_own_query;
4547#endif
4548 }
4549
4550 if (query == &brmctx->ip4_own_query)
4551 br_multicast_enable(ip4_own_query);
4552#if IS_ENABLED(CONFIG_IPV6)
4553 else
4554 br_multicast_enable(ip6_own_query);
4555#endif
4556 }
4557 rcu_read_unlock();
4558}
4559
4560int br_multicast_toggle(struct net_bridge *br, unsigned long val,
4561 struct netlink_ext_ack *extack)
4562{
4563 struct net_bridge_port *port;
4564 bool change_snoopers = false;
4565 int err = 0;
4566
4567 spin_lock_bh(&br->multicast_lock);
4568 if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val)
4569 goto unlock;
4570
4571 err = br_mc_disabled_update(br->dev, val, extack);
4572 if (err == -EOPNOTSUPP)
4573 err = 0;
4574 if (err)
4575 goto unlock;
4576
4577 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val);
4578 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) {
4579 change_snoopers = true;
4580 goto unlock;
4581 }
4582
4583 if (!netif_running(br->dev))
4584 goto unlock;
4585
4586 br_multicast_open(br);
4587 list_for_each_entry(port, &br->port_list, list)
4588 __br_multicast_enable_port_ctx(&port->multicast_ctx);
4589
4590 change_snoopers = true;
4591
4592unlock:
4593 spin_unlock_bh(&br->multicast_lock);
4594
4595 /* br_multicast_join_snoopers has the potential to cause
4596 * an MLD Report/Leave to be delivered to br_multicast_rcv,
4597 * which would in turn call br_multicast_add_group, which would
4598 * attempt to acquire multicast_lock. This function should be
4599 * called after the lock has been released to avoid deadlocks on
4600 * multicast_lock.
4601 *
4602 * br_multicast_leave_snoopers does not have the problem since
4603 * br_multicast_rcv first checks BROPT_MULTICAST_ENABLED, and
4604 * returns without calling br_multicast_ipv4/6_rcv if it's not
4605 * enabled. Moved both functions out just for symmetry.
4606 */
4607 if (change_snoopers) {
4608 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
4609 br_multicast_join_snoopers(br);
4610 else
4611 br_multicast_leave_snoopers(br);
4612 }
4613
4614 return err;
4615}
4616
4617bool br_multicast_enabled(const struct net_device *dev)
4618{
4619 struct net_bridge *br = netdev_priv(dev);
4620
4621 return !!br_opt_get(br, BROPT_MULTICAST_ENABLED);
4622}
4623EXPORT_SYMBOL_GPL(br_multicast_enabled);
4624
4625bool br_multicast_router(const struct net_device *dev)
4626{
4627 struct net_bridge *br = netdev_priv(dev);
4628 bool is_router;
4629
4630 spin_lock_bh(&br->multicast_lock);
4631 is_router = br_multicast_is_router(&br->multicast_ctx, NULL);
4632 spin_unlock_bh(&br->multicast_lock);
4633 return is_router;
4634}
4635EXPORT_SYMBOL_GPL(br_multicast_router);
4636
4637int br_multicast_set_querier(struct net_bridge_mcast *brmctx, unsigned long val)
4638{
4639 unsigned long max_delay;
4640
4641 val = !!val;
4642
4643 spin_lock_bh(&brmctx->br->multicast_lock);
4644 if (brmctx->multicast_querier == val)
4645 goto unlock;
4646
4647 WRITE_ONCE(brmctx->multicast_querier, val);
4648 if (!val)
4649 goto unlock;
4650
4651 max_delay = brmctx->multicast_query_response_interval;
4652
4653 if (!timer_pending(&brmctx->ip4_other_query.timer))
4654 mod_timer(&brmctx->ip4_other_query.delay_timer,
4655 jiffies + max_delay);
4656
4657 br_multicast_start_querier(brmctx, &brmctx->ip4_own_query);
4658
4659#if IS_ENABLED(CONFIG_IPV6)
4660 if (!timer_pending(&brmctx->ip6_other_query.timer))
4661 mod_timer(&brmctx->ip6_other_query.delay_timer,
4662 jiffies + max_delay);
4663
4664 br_multicast_start_querier(brmctx, &brmctx->ip6_own_query);
4665#endif
4666
4667unlock:
4668 spin_unlock_bh(&brmctx->br->multicast_lock);
4669
4670 return 0;
4671}
4672
4673int br_multicast_set_igmp_version(struct net_bridge_mcast *brmctx,
4674 unsigned long val)
4675{
4676 /* Currently we support only version 2 and 3 */
4677 switch (val) {
4678 case 2:
4679 case 3:
4680 break;
4681 default:
4682 return -EINVAL;
4683 }
4684
4685 spin_lock_bh(&brmctx->br->multicast_lock);
4686 brmctx->multicast_igmp_version = val;
4687 spin_unlock_bh(&brmctx->br->multicast_lock);
4688
4689 return 0;
4690}
4691
4692#if IS_ENABLED(CONFIG_IPV6)
4693int br_multicast_set_mld_version(struct net_bridge_mcast *brmctx,
4694 unsigned long val)
4695{
4696 /* Currently we support version 1 and 2 */
4697 switch (val) {
4698 case 1:
4699 case 2:
4700 break;
4701 default:
4702 return -EINVAL;
4703 }
4704
4705 spin_lock_bh(&brmctx->br->multicast_lock);
4706 brmctx->multicast_mld_version = val;
4707 spin_unlock_bh(&brmctx->br->multicast_lock);
4708
4709 return 0;
4710}
4711#endif
4712
4713void br_multicast_set_query_intvl(struct net_bridge_mcast *brmctx,
4714 unsigned long val)
4715{
4716 unsigned long intvl_jiffies = clock_t_to_jiffies(val);
4717
4718 if (intvl_jiffies < BR_MULTICAST_QUERY_INTVL_MIN) {
4719 br_info(brmctx->br,
4720 "trying to set multicast query interval below minimum, setting to %lu (%ums)\n",
4721 jiffies_to_clock_t(BR_MULTICAST_QUERY_INTVL_MIN),
4722 jiffies_to_msecs(BR_MULTICAST_QUERY_INTVL_MIN));
4723 intvl_jiffies = BR_MULTICAST_QUERY_INTVL_MIN;
4724 }
4725
4726 brmctx->multicast_query_interval = intvl_jiffies;
4727}
4728
4729void br_multicast_set_startup_query_intvl(struct net_bridge_mcast *brmctx,
4730 unsigned long val)
4731{
4732 unsigned long intvl_jiffies = clock_t_to_jiffies(val);
4733
4734 if (intvl_jiffies < BR_MULTICAST_STARTUP_QUERY_INTVL_MIN) {
4735 br_info(brmctx->br,
4736 "trying to set multicast startup query interval below minimum, setting to %lu (%ums)\n",
4737 jiffies_to_clock_t(BR_MULTICAST_STARTUP_QUERY_INTVL_MIN),
4738 jiffies_to_msecs(BR_MULTICAST_STARTUP_QUERY_INTVL_MIN));
4739 intvl_jiffies = BR_MULTICAST_STARTUP_QUERY_INTVL_MIN;
4740 }
4741
4742 brmctx->multicast_startup_query_interval = intvl_jiffies;
4743}
4744
4745/**
4746 * br_multicast_list_adjacent - Returns snooped multicast addresses
4747 * @dev: The bridge port adjacent to which to retrieve addresses
4748 * @br_ip_list: The list to store found, snooped multicast IP addresses in
4749 *
4750 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
4751 * snooping feature on all bridge ports of dev's bridge device, excluding
4752 * the addresses from dev itself.
4753 *
4754 * Returns the number of items added to br_ip_list.
4755 *
4756 * Notes:
4757 * - br_ip_list needs to be initialized by caller
4758 * - br_ip_list might contain duplicates in the end
4759 * (needs to be taken care of by caller)
4760 * - br_ip_list needs to be freed by caller
4761 */
4762int br_multicast_list_adjacent(struct net_device *dev,
4763 struct list_head *br_ip_list)
4764{
4765 struct net_bridge *br;
4766 struct net_bridge_port *port;
4767 struct net_bridge_port_group *group;
4768 struct br_ip_list *entry;
4769 int count = 0;
4770
4771 rcu_read_lock();
4772 if (!br_ip_list || !netif_is_bridge_port(dev))
4773 goto unlock;
4774
4775 port = br_port_get_rcu(dev);
4776 if (!port || !port->br)
4777 goto unlock;
4778
4779 br = port->br;
4780
4781 list_for_each_entry_rcu(port, &br->port_list, list) {
4782 if (!port->dev || port->dev == dev)
4783 continue;
4784
4785 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
4786 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
4787 if (!entry)
4788 goto unlock;
4789
4790 entry->addr = group->key.addr;
4791 list_add(&entry->list, br_ip_list);
4792 count++;
4793 }
4794 }
4795
4796unlock:
4797 rcu_read_unlock();
4798 return count;
4799}
4800EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
4801
4802/**
4803 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
4804 * @dev: The bridge port providing the bridge on which to check for a querier
4805 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
4806 *
4807 * Checks whether the given interface has a bridge on top and if so returns
4808 * true if a valid querier exists anywhere on the bridged link layer.
4809 * Otherwise returns false.
4810 */
4811bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
4812{
4813 struct net_bridge *br;
4814 struct net_bridge_port *port;
4815 struct ethhdr eth;
4816 bool ret = false;
4817
4818 rcu_read_lock();
4819 if (!netif_is_bridge_port(dev))
4820 goto unlock;
4821
4822 port = br_port_get_rcu(dev);
4823 if (!port || !port->br)
4824 goto unlock;
4825
4826 br = port->br;
4827
4828 memset(ð, 0, sizeof(eth));
4829 eth.h_proto = htons(proto);
4830
4831 ret = br_multicast_querier_exists(&br->multicast_ctx, ð, NULL);
4832
4833unlock:
4834 rcu_read_unlock();
4835 return ret;
4836}
4837EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
4838
4839/**
4840 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
4841 * @dev: The bridge port adjacent to which to check for a querier
4842 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
4843 *
4844 * Checks whether the given interface has a bridge on top and if so returns
4845 * true if a selected querier is behind one of the other ports of this
4846 * bridge. Otherwise returns false.
4847 */
4848bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
4849{
4850 struct net_bridge_mcast *brmctx;
4851 struct net_bridge *br;
4852 struct net_bridge_port *port;
4853 bool ret = false;
4854 int port_ifidx;
4855
4856 rcu_read_lock();
4857 if (!netif_is_bridge_port(dev))
4858 goto unlock;
4859
4860 port = br_port_get_rcu(dev);
4861 if (!port || !port->br)
4862 goto unlock;
4863
4864 br = port->br;
4865 brmctx = &br->multicast_ctx;
4866
4867 switch (proto) {
4868 case ETH_P_IP:
4869 port_ifidx = brmctx->ip4_querier.port_ifidx;
4870 if (!timer_pending(&brmctx->ip4_other_query.timer) ||
4871 port_ifidx == port->dev->ifindex)
4872 goto unlock;
4873 break;
4874#if IS_ENABLED(CONFIG_IPV6)
4875 case ETH_P_IPV6:
4876 port_ifidx = brmctx->ip6_querier.port_ifidx;
4877 if (!timer_pending(&brmctx->ip6_other_query.timer) ||
4878 port_ifidx == port->dev->ifindex)
4879 goto unlock;
4880 break;
4881#endif
4882 default:
4883 goto unlock;
4884 }
4885
4886 ret = true;
4887unlock:
4888 rcu_read_unlock();
4889 return ret;
4890}
4891EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
4892
4893/**
4894 * br_multicast_has_router_adjacent - Checks for a router behind a bridge port
4895 * @dev: The bridge port adjacent to which to check for a multicast router
4896 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
4897 *
4898 * Checks whether the given interface has a bridge on top and if so returns
4899 * true if a multicast router is behind one of the other ports of this
4900 * bridge. Otherwise returns false.
4901 */
4902bool br_multicast_has_router_adjacent(struct net_device *dev, int proto)
4903{
4904 struct net_bridge_mcast_port *pmctx;
4905 struct net_bridge_mcast *brmctx;
4906 struct net_bridge_port *port;
4907 bool ret = false;
4908
4909 rcu_read_lock();
4910 port = br_port_get_check_rcu(dev);
4911 if (!port)
4912 goto unlock;
4913
4914 brmctx = &port->br->multicast_ctx;
4915 switch (proto) {
4916 case ETH_P_IP:
4917 hlist_for_each_entry_rcu(pmctx, &brmctx->ip4_mc_router_list,
4918 ip4_rlist) {
4919 if (pmctx->port == port)
4920 continue;
4921
4922 ret = true;
4923 goto unlock;
4924 }
4925 break;
4926#if IS_ENABLED(CONFIG_IPV6)
4927 case ETH_P_IPV6:
4928 hlist_for_each_entry_rcu(pmctx, &brmctx->ip6_mc_router_list,
4929 ip6_rlist) {
4930 if (pmctx->port == port)
4931 continue;
4932
4933 ret = true;
4934 goto unlock;
4935 }
4936 break;
4937#endif
4938 default:
4939 /* when compiled without IPv6 support, be conservative and
4940 * always assume presence of an IPv6 multicast router
4941 */
4942 ret = true;
4943 }
4944
4945unlock:
4946 rcu_read_unlock();
4947 return ret;
4948}
4949EXPORT_SYMBOL_GPL(br_multicast_has_router_adjacent);
4950
4951static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
4952 const struct sk_buff *skb, u8 type, u8 dir)
4953{
4954 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
4955 __be16 proto = skb->protocol;
4956 unsigned int t_len;
4957
4958 u64_stats_update_begin(&pstats->syncp);
4959 switch (proto) {
4960 case htons(ETH_P_IP):
4961 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
4962 switch (type) {
4963 case IGMP_HOST_MEMBERSHIP_REPORT:
4964 pstats->mstats.igmp_v1reports[dir]++;
4965 break;
4966 case IGMPV2_HOST_MEMBERSHIP_REPORT:
4967 pstats->mstats.igmp_v2reports[dir]++;
4968 break;
4969 case IGMPV3_HOST_MEMBERSHIP_REPORT:
4970 pstats->mstats.igmp_v3reports[dir]++;
4971 break;
4972 case IGMP_HOST_MEMBERSHIP_QUERY:
4973 if (t_len != sizeof(struct igmphdr)) {
4974 pstats->mstats.igmp_v3queries[dir]++;
4975 } else {
4976 unsigned int offset = skb_transport_offset(skb);
4977 struct igmphdr *ih, _ihdr;
4978
4979 ih = skb_header_pointer(skb, offset,
4980 sizeof(_ihdr), &_ihdr);
4981 if (!ih)
4982 break;
4983 if (!ih->code)
4984 pstats->mstats.igmp_v1queries[dir]++;
4985 else
4986 pstats->mstats.igmp_v2queries[dir]++;
4987 }
4988 break;
4989 case IGMP_HOST_LEAVE_MESSAGE:
4990 pstats->mstats.igmp_leaves[dir]++;
4991 break;
4992 }
4993 break;
4994#if IS_ENABLED(CONFIG_IPV6)
4995 case htons(ETH_P_IPV6):
4996 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
4997 sizeof(struct ipv6hdr);
4998 t_len -= skb_network_header_len(skb);
4999 switch (type) {
5000 case ICMPV6_MGM_REPORT:
5001 pstats->mstats.mld_v1reports[dir]++;
5002 break;
5003 case ICMPV6_MLD2_REPORT:
5004 pstats->mstats.mld_v2reports[dir]++;
5005 break;
5006 case ICMPV6_MGM_QUERY:
5007 if (t_len != sizeof(struct mld_msg))
5008 pstats->mstats.mld_v2queries[dir]++;
5009 else
5010 pstats->mstats.mld_v1queries[dir]++;
5011 break;
5012 case ICMPV6_MGM_REDUCTION:
5013 pstats->mstats.mld_leaves[dir]++;
5014 break;
5015 }
5016 break;
5017#endif /* CONFIG_IPV6 */
5018 }
5019 u64_stats_update_end(&pstats->syncp);
5020}
5021
5022void br_multicast_count(struct net_bridge *br,
5023 const struct net_bridge_port *p,
5024 const struct sk_buff *skb, u8 type, u8 dir)
5025{
5026 struct bridge_mcast_stats __percpu *stats;
5027
5028 /* if multicast_disabled is true then igmp type can't be set */
5029 if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
5030 return;
5031
5032 if (p)
5033 stats = p->mcast_stats;
5034 else
5035 stats = br->mcast_stats;
5036 if (WARN_ON(!stats))
5037 return;
5038
5039 br_mcast_stats_add(stats, skb, type, dir);
5040}
5041
5042int br_multicast_init_stats(struct net_bridge *br)
5043{
5044 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
5045 if (!br->mcast_stats)
5046 return -ENOMEM;
5047
5048 return 0;
5049}
5050
5051void br_multicast_uninit_stats(struct net_bridge *br)
5052{
5053 free_percpu(br->mcast_stats);
5054}
5055
5056/* noinline for https://bugs.llvm.org/show_bug.cgi?id=45802#c9 */
5057static noinline_for_stack void mcast_stats_add_dir(u64 *dst, u64 *src)
5058{
5059 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
5060 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
5061}
5062
5063void br_multicast_get_stats(const struct net_bridge *br,
5064 const struct net_bridge_port *p,
5065 struct br_mcast_stats *dest)
5066{
5067 struct bridge_mcast_stats __percpu *stats;
5068 struct br_mcast_stats tdst;
5069 int i;
5070
5071 memset(dest, 0, sizeof(*dest));
5072 if (p)
5073 stats = p->mcast_stats;
5074 else
5075 stats = br->mcast_stats;
5076 if (WARN_ON(!stats))
5077 return;
5078
5079 memset(&tdst, 0, sizeof(tdst));
5080 for_each_possible_cpu(i) {
5081 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
5082 struct br_mcast_stats temp;
5083 unsigned int start;
5084
5085 do {
5086 start = u64_stats_fetch_begin(&cpu_stats->syncp);
5087 memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
5088 } while (u64_stats_fetch_retry(&cpu_stats->syncp, start));
5089
5090 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
5091 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
5092 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
5093 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
5094 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
5095 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
5096 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
5097 tdst.igmp_parse_errors += temp.igmp_parse_errors;
5098
5099 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
5100 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
5101 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
5102 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
5103 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
5104 tdst.mld_parse_errors += temp.mld_parse_errors;
5105 }
5106 memcpy(dest, &tdst, sizeof(*dest));
5107}
5108
5109int br_mdb_hash_init(struct net_bridge *br)
5110{
5111 int err;
5112
5113 err = rhashtable_init(&br->sg_port_tbl, &br_sg_port_rht_params);
5114 if (err)
5115 return err;
5116
5117 err = rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params);
5118 if (err) {
5119 rhashtable_destroy(&br->sg_port_tbl);
5120 return err;
5121 }
5122
5123 return 0;
5124}
5125
5126void br_mdb_hash_fini(struct net_bridge *br)
5127{
5128 rhashtable_destroy(&br->sg_port_tbl);
5129 rhashtable_destroy(&br->mdb_hash_tbl);
5130}
1/*
2 * Bridge multicast support.
3 *
4 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13#include <linux/err.h>
14#include <linux/if_ether.h>
15#include <linux/igmp.h>
16#include <linux/jhash.h>
17#include <linux/kernel.h>
18#include <linux/log2.h>
19#include <linux/netdevice.h>
20#include <linux/netfilter_bridge.h>
21#include <linux/random.h>
22#include <linux/rculist.h>
23#include <linux/skbuff.h>
24#include <linux/slab.h>
25#include <linux/timer.h>
26#include <linux/inetdevice.h>
27#include <net/ip.h>
28#if IS_ENABLED(CONFIG_IPV6)
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
37static void br_multicast_start_querier(struct net_bridge *br,
38 struct bridge_mcast_query *query);
39unsigned int br_mdb_rehash_seq;
40
41static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
42{
43 if (a->proto != b->proto)
44 return 0;
45 if (a->vid != b->vid)
46 return 0;
47 switch (a->proto) {
48 case htons(ETH_P_IP):
49 return a->u.ip4 == b->u.ip4;
50#if IS_ENABLED(CONFIG_IPV6)
51 case htons(ETH_P_IPV6):
52 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
53#endif
54 }
55 return 0;
56}
57
58static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
59 __u16 vid)
60{
61 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
62}
63
64#if IS_ENABLED(CONFIG_IPV6)
65static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
66 const struct in6_addr *ip,
67 __u16 vid)
68{
69 return jhash_2words(ipv6_addr_hash(ip), vid,
70 mdb->secret) & (mdb->max - 1);
71}
72#endif
73
74static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
75 struct br_ip *ip)
76{
77 switch (ip->proto) {
78 case htons(ETH_P_IP):
79 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
80#if IS_ENABLED(CONFIG_IPV6)
81 case htons(ETH_P_IPV6):
82 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
83#endif
84 }
85 return 0;
86}
87
88static struct net_bridge_mdb_entry *__br_mdb_ip_get(
89 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
90{
91 struct net_bridge_mdb_entry *mp;
92
93 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
94 if (br_ip_equal(&mp->addr, dst))
95 return mp;
96 }
97
98 return NULL;
99}
100
101struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
102 struct br_ip *dst)
103{
104 if (!mdb)
105 return NULL;
106
107 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
108}
109
110static struct net_bridge_mdb_entry *br_mdb_ip4_get(
111 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
112{
113 struct br_ip br_dst;
114
115 br_dst.u.ip4 = dst;
116 br_dst.proto = htons(ETH_P_IP);
117 br_dst.vid = vid;
118
119 return br_mdb_ip_get(mdb, &br_dst);
120}
121
122#if IS_ENABLED(CONFIG_IPV6)
123static struct net_bridge_mdb_entry *br_mdb_ip6_get(
124 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
125 __u16 vid)
126{
127 struct br_ip br_dst;
128
129 br_dst.u.ip6 = *dst;
130 br_dst.proto = htons(ETH_P_IPV6);
131 br_dst.vid = vid;
132
133 return br_mdb_ip_get(mdb, &br_dst);
134}
135#endif
136
137struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
138 struct sk_buff *skb, u16 vid)
139{
140 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
141 struct br_ip ip;
142
143 if (br->multicast_disabled)
144 return NULL;
145
146 if (BR_INPUT_SKB_CB(skb)->igmp)
147 return NULL;
148
149 ip.proto = skb->protocol;
150 ip.vid = vid;
151
152 switch (skb->protocol) {
153 case htons(ETH_P_IP):
154 ip.u.ip4 = ip_hdr(skb)->daddr;
155 break;
156#if IS_ENABLED(CONFIG_IPV6)
157 case htons(ETH_P_IPV6):
158 ip.u.ip6 = ipv6_hdr(skb)->daddr;
159 break;
160#endif
161 default:
162 return NULL;
163 }
164
165 return br_mdb_ip_get(mdb, &ip);
166}
167
168static void br_mdb_free(struct rcu_head *head)
169{
170 struct net_bridge_mdb_htable *mdb =
171 container_of(head, struct net_bridge_mdb_htable, rcu);
172 struct net_bridge_mdb_htable *old = mdb->old;
173
174 mdb->old = NULL;
175 kfree(old->mhash);
176 kfree(old);
177}
178
179static int br_mdb_copy(struct net_bridge_mdb_htable *new,
180 struct net_bridge_mdb_htable *old,
181 int elasticity)
182{
183 struct net_bridge_mdb_entry *mp;
184 int maxlen;
185 int len;
186 int i;
187
188 for (i = 0; i < old->max; i++)
189 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
190 hlist_add_head(&mp->hlist[new->ver],
191 &new->mhash[br_ip_hash(new, &mp->addr)]);
192
193 if (!elasticity)
194 return 0;
195
196 maxlen = 0;
197 for (i = 0; i < new->max; i++) {
198 len = 0;
199 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
200 len++;
201 if (len > maxlen)
202 maxlen = len;
203 }
204
205 return maxlen > elasticity ? -EINVAL : 0;
206}
207
208void br_multicast_free_pg(struct rcu_head *head)
209{
210 struct net_bridge_port_group *p =
211 container_of(head, struct net_bridge_port_group, rcu);
212
213 kfree(p);
214}
215
216static void br_multicast_free_group(struct rcu_head *head)
217{
218 struct net_bridge_mdb_entry *mp =
219 container_of(head, struct net_bridge_mdb_entry, rcu);
220
221 kfree(mp);
222}
223
224static void br_multicast_group_expired(unsigned long data)
225{
226 struct net_bridge_mdb_entry *mp = (void *)data;
227 struct net_bridge *br = mp->br;
228 struct net_bridge_mdb_htable *mdb;
229
230 spin_lock(&br->multicast_lock);
231 if (!netif_running(br->dev) || timer_pending(&mp->timer))
232 goto out;
233
234 mp->mglist = false;
235
236 if (mp->ports)
237 goto out;
238
239 mdb = mlock_dereference(br->mdb, br);
240
241 hlist_del_rcu(&mp->hlist[mdb->ver]);
242 mdb->size--;
243
244 call_rcu_bh(&mp->rcu, br_multicast_free_group);
245
246out:
247 spin_unlock(&br->multicast_lock);
248}
249
250static void br_multicast_del_pg(struct net_bridge *br,
251 struct net_bridge_port_group *pg)
252{
253 struct net_bridge_mdb_htable *mdb;
254 struct net_bridge_mdb_entry *mp;
255 struct net_bridge_port_group *p;
256 struct net_bridge_port_group __rcu **pp;
257
258 mdb = mlock_dereference(br->mdb, br);
259
260 mp = br_mdb_ip_get(mdb, &pg->addr);
261 if (WARN_ON(!mp))
262 return;
263
264 for (pp = &mp->ports;
265 (p = mlock_dereference(*pp, br)) != NULL;
266 pp = &p->next) {
267 if (p != pg)
268 continue;
269
270 rcu_assign_pointer(*pp, p->next);
271 hlist_del_init(&p->mglist);
272 del_timer(&p->timer);
273 call_rcu_bh(&p->rcu, br_multicast_free_pg);
274
275 if (!mp->ports && !mp->mglist &&
276 netif_running(br->dev))
277 mod_timer(&mp->timer, jiffies);
278
279 return;
280 }
281
282 WARN_ON(1);
283}
284
285static void br_multicast_port_group_expired(unsigned long data)
286{
287 struct net_bridge_port_group *pg = (void *)data;
288 struct net_bridge *br = pg->port->br;
289
290 spin_lock(&br->multicast_lock);
291 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
292 hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
293 goto out;
294
295 br_multicast_del_pg(br, pg);
296
297out:
298 spin_unlock(&br->multicast_lock);
299}
300
301static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
302 int elasticity)
303{
304 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
305 struct net_bridge_mdb_htable *mdb;
306 int err;
307
308 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
309 if (!mdb)
310 return -ENOMEM;
311
312 mdb->max = max;
313 mdb->old = old;
314
315 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
316 if (!mdb->mhash) {
317 kfree(mdb);
318 return -ENOMEM;
319 }
320
321 mdb->size = old ? old->size : 0;
322 mdb->ver = old ? old->ver ^ 1 : 0;
323
324 if (!old || elasticity)
325 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
326 else
327 mdb->secret = old->secret;
328
329 if (!old)
330 goto out;
331
332 err = br_mdb_copy(mdb, old, elasticity);
333 if (err) {
334 kfree(mdb->mhash);
335 kfree(mdb);
336 return err;
337 }
338
339 br_mdb_rehash_seq++;
340 call_rcu_bh(&mdb->rcu, br_mdb_free);
341
342out:
343 rcu_assign_pointer(*mdbp, mdb);
344
345 return 0;
346}
347
348static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
349 __be32 group)
350{
351 struct sk_buff *skb;
352 struct igmphdr *ih;
353 struct ethhdr *eth;
354 struct iphdr *iph;
355
356 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
357 sizeof(*ih) + 4);
358 if (!skb)
359 goto out;
360
361 skb->protocol = htons(ETH_P_IP);
362
363 skb_reset_mac_header(skb);
364 eth = eth_hdr(skb);
365
366 ether_addr_copy(eth->h_source, br->dev->dev_addr);
367 eth->h_dest[0] = 1;
368 eth->h_dest[1] = 0;
369 eth->h_dest[2] = 0x5e;
370 eth->h_dest[3] = 0;
371 eth->h_dest[4] = 0;
372 eth->h_dest[5] = 1;
373 eth->h_proto = htons(ETH_P_IP);
374 skb_put(skb, sizeof(*eth));
375
376 skb_set_network_header(skb, skb->len);
377 iph = ip_hdr(skb);
378
379 iph->version = 4;
380 iph->ihl = 6;
381 iph->tos = 0xc0;
382 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
383 iph->id = 0;
384 iph->frag_off = htons(IP_DF);
385 iph->ttl = 1;
386 iph->protocol = IPPROTO_IGMP;
387 iph->saddr = br->multicast_query_use_ifaddr ?
388 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
389 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
390 ((u8 *)&iph[1])[0] = IPOPT_RA;
391 ((u8 *)&iph[1])[1] = 4;
392 ((u8 *)&iph[1])[2] = 0;
393 ((u8 *)&iph[1])[3] = 0;
394 ip_send_check(iph);
395 skb_put(skb, 24);
396
397 skb_set_transport_header(skb, skb->len);
398 ih = igmp_hdr(skb);
399 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
400 ih->code = (group ? br->multicast_last_member_interval :
401 br->multicast_query_response_interval) /
402 (HZ / IGMP_TIMER_SCALE);
403 ih->group = group;
404 ih->csum = 0;
405 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
406 skb_put(skb, sizeof(*ih));
407
408 __skb_pull(skb, sizeof(*eth));
409
410out:
411 return skb;
412}
413
414#if IS_ENABLED(CONFIG_IPV6)
415static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
416 const struct in6_addr *group)
417{
418 struct sk_buff *skb;
419 struct ipv6hdr *ip6h;
420 struct mld_msg *mldq;
421 struct ethhdr *eth;
422 u8 *hopopt;
423 unsigned long interval;
424
425 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
426 8 + sizeof(*mldq));
427 if (!skb)
428 goto out;
429
430 skb->protocol = htons(ETH_P_IPV6);
431
432 /* Ethernet header */
433 skb_reset_mac_header(skb);
434 eth = eth_hdr(skb);
435
436 ether_addr_copy(eth->h_source, br->dev->dev_addr);
437 eth->h_proto = htons(ETH_P_IPV6);
438 skb_put(skb, sizeof(*eth));
439
440 /* IPv6 header + HbH option */
441 skb_set_network_header(skb, skb->len);
442 ip6h = ipv6_hdr(skb);
443
444 *(__force __be32 *)ip6h = htonl(0x60000000);
445 ip6h->payload_len = htons(8 + sizeof(*mldq));
446 ip6h->nexthdr = IPPROTO_HOPOPTS;
447 ip6h->hop_limit = 1;
448 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
449 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
450 &ip6h->saddr)) {
451 kfree_skb(skb);
452 return NULL;
453 }
454 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
455
456 hopopt = (u8 *)(ip6h + 1);
457 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
458 hopopt[1] = 0; /* length of HbH */
459 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
460 hopopt[3] = 2; /* Length of RA Option */
461 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
462 hopopt[5] = 0;
463 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
464 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
465
466 skb_put(skb, sizeof(*ip6h) + 8);
467
468 /* ICMPv6 */
469 skb_set_transport_header(skb, skb->len);
470 mldq = (struct mld_msg *) icmp6_hdr(skb);
471
472 interval = ipv6_addr_any(group) ?
473 br->multicast_query_response_interval :
474 br->multicast_last_member_interval;
475
476 mldq->mld_type = ICMPV6_MGM_QUERY;
477 mldq->mld_code = 0;
478 mldq->mld_cksum = 0;
479 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
480 mldq->mld_reserved = 0;
481 mldq->mld_mca = *group;
482
483 /* checksum */
484 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
485 sizeof(*mldq), IPPROTO_ICMPV6,
486 csum_partial(mldq,
487 sizeof(*mldq), 0));
488 skb_put(skb, sizeof(*mldq));
489
490 __skb_pull(skb, sizeof(*eth));
491
492out:
493 return skb;
494}
495#endif
496
497static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
498 struct br_ip *addr)
499{
500 switch (addr->proto) {
501 case htons(ETH_P_IP):
502 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
503#if IS_ENABLED(CONFIG_IPV6)
504 case htons(ETH_P_IPV6):
505 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
506#endif
507 }
508 return NULL;
509}
510
511static struct net_bridge_mdb_entry *br_multicast_get_group(
512 struct net_bridge *br, struct net_bridge_port *port,
513 struct br_ip *group, int hash)
514{
515 struct net_bridge_mdb_htable *mdb;
516 struct net_bridge_mdb_entry *mp;
517 unsigned int count = 0;
518 unsigned int max;
519 int elasticity;
520 int err;
521
522 mdb = rcu_dereference_protected(br->mdb, 1);
523 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
524 count++;
525 if (unlikely(br_ip_equal(group, &mp->addr)))
526 return mp;
527 }
528
529 elasticity = 0;
530 max = mdb->max;
531
532 if (unlikely(count > br->hash_elasticity && count)) {
533 if (net_ratelimit())
534 br_info(br, "Multicast hash table "
535 "chain limit reached: %s\n",
536 port ? port->dev->name : br->dev->name);
537
538 elasticity = br->hash_elasticity;
539 }
540
541 if (mdb->size >= max) {
542 max *= 2;
543 if (unlikely(max > br->hash_max)) {
544 br_warn(br, "Multicast hash table maximum of %d "
545 "reached, disabling snooping: %s\n",
546 br->hash_max,
547 port ? port->dev->name : br->dev->name);
548 err = -E2BIG;
549disable:
550 br->multicast_disabled = 1;
551 goto err;
552 }
553 }
554
555 if (max > mdb->max || elasticity) {
556 if (mdb->old) {
557 if (net_ratelimit())
558 br_info(br, "Multicast hash table "
559 "on fire: %s\n",
560 port ? port->dev->name : br->dev->name);
561 err = -EEXIST;
562 goto err;
563 }
564
565 err = br_mdb_rehash(&br->mdb, max, elasticity);
566 if (err) {
567 br_warn(br, "Cannot rehash multicast "
568 "hash table, disabling snooping: %s, %d, %d\n",
569 port ? port->dev->name : br->dev->name,
570 mdb->size, err);
571 goto disable;
572 }
573
574 err = -EAGAIN;
575 goto err;
576 }
577
578 return NULL;
579
580err:
581 mp = ERR_PTR(err);
582 return mp;
583}
584
585struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
586 struct net_bridge_port *port, struct br_ip *group)
587{
588 struct net_bridge_mdb_htable *mdb;
589 struct net_bridge_mdb_entry *mp;
590 int hash;
591 int err;
592
593 mdb = rcu_dereference_protected(br->mdb, 1);
594 if (!mdb) {
595 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
596 if (err)
597 return ERR_PTR(err);
598 goto rehash;
599 }
600
601 hash = br_ip_hash(mdb, group);
602 mp = br_multicast_get_group(br, port, group, hash);
603 switch (PTR_ERR(mp)) {
604 case 0:
605 break;
606
607 case -EAGAIN:
608rehash:
609 mdb = rcu_dereference_protected(br->mdb, 1);
610 hash = br_ip_hash(mdb, group);
611 break;
612
613 default:
614 goto out;
615 }
616
617 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
618 if (unlikely(!mp))
619 return ERR_PTR(-ENOMEM);
620
621 mp->br = br;
622 mp->addr = *group;
623 setup_timer(&mp->timer, br_multicast_group_expired,
624 (unsigned long)mp);
625
626 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
627 mdb->size++;
628
629out:
630 return mp;
631}
632
633struct net_bridge_port_group *br_multicast_new_port_group(
634 struct net_bridge_port *port,
635 struct br_ip *group,
636 struct net_bridge_port_group __rcu *next,
637 unsigned char state)
638{
639 struct net_bridge_port_group *p;
640
641 p = kzalloc(sizeof(*p), GFP_ATOMIC);
642 if (unlikely(!p))
643 return NULL;
644
645 p->addr = *group;
646 p->port = port;
647 p->state = state;
648 rcu_assign_pointer(p->next, next);
649 hlist_add_head(&p->mglist, &port->mglist);
650 setup_timer(&p->timer, br_multicast_port_group_expired,
651 (unsigned long)p);
652 return p;
653}
654
655static int br_multicast_add_group(struct net_bridge *br,
656 struct net_bridge_port *port,
657 struct br_ip *group)
658{
659 struct net_bridge_mdb_entry *mp;
660 struct net_bridge_port_group *p;
661 struct net_bridge_port_group __rcu **pp;
662 unsigned long now = jiffies;
663 int err;
664
665 spin_lock(&br->multicast_lock);
666 if (!netif_running(br->dev) ||
667 (port && port->state == BR_STATE_DISABLED))
668 goto out;
669
670 mp = br_multicast_new_group(br, port, group);
671 err = PTR_ERR(mp);
672 if (IS_ERR(mp))
673 goto err;
674
675 if (!port) {
676 mp->mglist = true;
677 mod_timer(&mp->timer, now + br->multicast_membership_interval);
678 goto out;
679 }
680
681 for (pp = &mp->ports;
682 (p = mlock_dereference(*pp, br)) != NULL;
683 pp = &p->next) {
684 if (p->port == port)
685 goto found;
686 if ((unsigned long)p->port < (unsigned long)port)
687 break;
688 }
689
690 p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
691 if (unlikely(!p))
692 goto err;
693 rcu_assign_pointer(*pp, p);
694 br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
695
696found:
697 mod_timer(&p->timer, now + br->multicast_membership_interval);
698out:
699 err = 0;
700
701err:
702 spin_unlock(&br->multicast_lock);
703 return err;
704}
705
706static int br_ip4_multicast_add_group(struct net_bridge *br,
707 struct net_bridge_port *port,
708 __be32 group,
709 __u16 vid)
710{
711 struct br_ip br_group;
712
713 if (ipv4_is_local_multicast(group))
714 return 0;
715
716 br_group.u.ip4 = group;
717 br_group.proto = htons(ETH_P_IP);
718 br_group.vid = vid;
719
720 return br_multicast_add_group(br, port, &br_group);
721}
722
723#if IS_ENABLED(CONFIG_IPV6)
724static int br_ip6_multicast_add_group(struct net_bridge *br,
725 struct net_bridge_port *port,
726 const struct in6_addr *group,
727 __u16 vid)
728{
729 struct br_ip br_group;
730
731 if (ipv6_addr_is_ll_all_nodes(group))
732 return 0;
733
734 br_group.u.ip6 = *group;
735 br_group.proto = htons(ETH_P_IPV6);
736 br_group.vid = vid;
737
738 return br_multicast_add_group(br, port, &br_group);
739}
740#endif
741
742static void br_multicast_router_expired(unsigned long data)
743{
744 struct net_bridge_port *port = (void *)data;
745 struct net_bridge *br = port->br;
746
747 spin_lock(&br->multicast_lock);
748 if (port->multicast_router != 1 ||
749 timer_pending(&port->multicast_router_timer) ||
750 hlist_unhashed(&port->rlist))
751 goto out;
752
753 hlist_del_init_rcu(&port->rlist);
754
755out:
756 spin_unlock(&br->multicast_lock);
757}
758
759static void br_multicast_local_router_expired(unsigned long data)
760{
761}
762
763static void br_multicast_querier_expired(struct net_bridge *br,
764 struct bridge_mcast_query *query)
765{
766 spin_lock(&br->multicast_lock);
767 if (!netif_running(br->dev) || br->multicast_disabled)
768 goto out;
769
770 br_multicast_start_querier(br, query);
771
772out:
773 spin_unlock(&br->multicast_lock);
774}
775
776static void br_ip4_multicast_querier_expired(unsigned long data)
777{
778 struct net_bridge *br = (void *)data;
779
780 br_multicast_querier_expired(br, &br->ip4_query);
781}
782
783#if IS_ENABLED(CONFIG_IPV6)
784static void br_ip6_multicast_querier_expired(unsigned long data)
785{
786 struct net_bridge *br = (void *)data;
787
788 br_multicast_querier_expired(br, &br->ip6_query);
789}
790#endif
791
792static void __br_multicast_send_query(struct net_bridge *br,
793 struct net_bridge_port *port,
794 struct br_ip *ip)
795{
796 struct sk_buff *skb;
797
798 skb = br_multicast_alloc_query(br, ip);
799 if (!skb)
800 return;
801
802 if (port) {
803 __skb_push(skb, sizeof(struct ethhdr));
804 skb->dev = port->dev;
805 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
806 dev_queue_xmit);
807 } else
808 netif_rx(skb);
809}
810
811static void br_multicast_send_query(struct net_bridge *br,
812 struct net_bridge_port *port,
813 struct bridge_mcast_query *query)
814{
815 unsigned long time;
816 struct br_ip br_group;
817 struct bridge_mcast_querier *querier = NULL;
818
819 if (!netif_running(br->dev) || br->multicast_disabled ||
820 !br->multicast_querier)
821 return;
822
823 memset(&br_group.u, 0, sizeof(br_group.u));
824
825 if (port ? (query == &port->ip4_query) :
826 (query == &br->ip4_query)) {
827 querier = &br->ip4_querier;
828 br_group.proto = htons(ETH_P_IP);
829#if IS_ENABLED(CONFIG_IPV6)
830 } else {
831 querier = &br->ip6_querier;
832 br_group.proto = htons(ETH_P_IPV6);
833#endif
834 }
835
836 if (!querier || timer_pending(&querier->timer))
837 return;
838
839 __br_multicast_send_query(br, port, &br_group);
840
841 time = jiffies;
842 time += query->startup_sent < br->multicast_startup_query_count ?
843 br->multicast_startup_query_interval :
844 br->multicast_query_interval;
845 mod_timer(&query->timer, time);
846}
847
848static void br_multicast_port_query_expired(struct net_bridge_port *port,
849 struct bridge_mcast_query *query)
850{
851 struct net_bridge *br = port->br;
852
853 spin_lock(&br->multicast_lock);
854 if (port->state == BR_STATE_DISABLED ||
855 port->state == BR_STATE_BLOCKING)
856 goto out;
857
858 if (query->startup_sent < br->multicast_startup_query_count)
859 query->startup_sent++;
860
861 br_multicast_send_query(port->br, port, query);
862
863out:
864 spin_unlock(&br->multicast_lock);
865}
866
867static void br_ip4_multicast_port_query_expired(unsigned long data)
868{
869 struct net_bridge_port *port = (void *)data;
870
871 br_multicast_port_query_expired(port, &port->ip4_query);
872}
873
874#if IS_ENABLED(CONFIG_IPV6)
875static void br_ip6_multicast_port_query_expired(unsigned long data)
876{
877 struct net_bridge_port *port = (void *)data;
878
879 br_multicast_port_query_expired(port, &port->ip6_query);
880}
881#endif
882
883void br_multicast_add_port(struct net_bridge_port *port)
884{
885 port->multicast_router = 1;
886
887 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
888 (unsigned long)port);
889 setup_timer(&port->ip4_query.timer, br_ip4_multicast_port_query_expired,
890 (unsigned long)port);
891#if IS_ENABLED(CONFIG_IPV6)
892 setup_timer(&port->ip6_query.timer, br_ip6_multicast_port_query_expired,
893 (unsigned long)port);
894#endif
895}
896
897void br_multicast_del_port(struct net_bridge_port *port)
898{
899 del_timer_sync(&port->multicast_router_timer);
900}
901
902static void br_multicast_enable(struct bridge_mcast_query *query)
903{
904 query->startup_sent = 0;
905
906 if (try_to_del_timer_sync(&query->timer) >= 0 ||
907 del_timer(&query->timer))
908 mod_timer(&query->timer, jiffies);
909}
910
911void br_multicast_enable_port(struct net_bridge_port *port)
912{
913 struct net_bridge *br = port->br;
914
915 spin_lock(&br->multicast_lock);
916 if (br->multicast_disabled || !netif_running(br->dev))
917 goto out;
918
919 br_multicast_enable(&port->ip4_query);
920#if IS_ENABLED(CONFIG_IPV6)
921 br_multicast_enable(&port->ip6_query);
922#endif
923
924out:
925 spin_unlock(&br->multicast_lock);
926}
927
928void br_multicast_disable_port(struct net_bridge_port *port)
929{
930 struct net_bridge *br = port->br;
931 struct net_bridge_port_group *pg;
932 struct hlist_node *n;
933
934 spin_lock(&br->multicast_lock);
935 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
936 br_multicast_del_pg(br, pg);
937
938 if (!hlist_unhashed(&port->rlist))
939 hlist_del_init_rcu(&port->rlist);
940 del_timer(&port->multicast_router_timer);
941 del_timer(&port->ip4_query.timer);
942#if IS_ENABLED(CONFIG_IPV6)
943 del_timer(&port->ip6_query.timer);
944#endif
945 spin_unlock(&br->multicast_lock);
946}
947
948static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
949 struct net_bridge_port *port,
950 struct sk_buff *skb,
951 u16 vid)
952{
953 struct igmpv3_report *ih;
954 struct igmpv3_grec *grec;
955 int i;
956 int len;
957 int num;
958 int type;
959 int err = 0;
960 __be32 group;
961
962 if (!pskb_may_pull(skb, sizeof(*ih)))
963 return -EINVAL;
964
965 ih = igmpv3_report_hdr(skb);
966 num = ntohs(ih->ngrec);
967 len = sizeof(*ih);
968
969 for (i = 0; i < num; i++) {
970 len += sizeof(*grec);
971 if (!pskb_may_pull(skb, len))
972 return -EINVAL;
973
974 grec = (void *)(skb->data + len - sizeof(*grec));
975 group = grec->grec_mca;
976 type = grec->grec_type;
977
978 len += ntohs(grec->grec_nsrcs) * 4;
979 if (!pskb_may_pull(skb, len))
980 return -EINVAL;
981
982 /* We treat this as an IGMPv2 report for now. */
983 switch (type) {
984 case IGMPV3_MODE_IS_INCLUDE:
985 case IGMPV3_MODE_IS_EXCLUDE:
986 case IGMPV3_CHANGE_TO_INCLUDE:
987 case IGMPV3_CHANGE_TO_EXCLUDE:
988 case IGMPV3_ALLOW_NEW_SOURCES:
989 case IGMPV3_BLOCK_OLD_SOURCES:
990 break;
991
992 default:
993 continue;
994 }
995
996 err = br_ip4_multicast_add_group(br, port, group, vid);
997 if (err)
998 break;
999 }
1000
1001 return err;
1002}
1003
1004#if IS_ENABLED(CONFIG_IPV6)
1005static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1006 struct net_bridge_port *port,
1007 struct sk_buff *skb,
1008 u16 vid)
1009{
1010 struct icmp6hdr *icmp6h;
1011 struct mld2_grec *grec;
1012 int i;
1013 int len;
1014 int num;
1015 int err = 0;
1016
1017 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1018 return -EINVAL;
1019
1020 icmp6h = icmp6_hdr(skb);
1021 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1022 len = sizeof(*icmp6h);
1023
1024 for (i = 0; i < num; i++) {
1025 __be16 *nsrcs, _nsrcs;
1026
1027 nsrcs = skb_header_pointer(skb,
1028 len + offsetof(struct mld2_grec,
1029 grec_nsrcs),
1030 sizeof(_nsrcs), &_nsrcs);
1031 if (!nsrcs)
1032 return -EINVAL;
1033
1034 if (!pskb_may_pull(skb,
1035 len + sizeof(*grec) +
1036 sizeof(struct in6_addr) * ntohs(*nsrcs)))
1037 return -EINVAL;
1038
1039 grec = (struct mld2_grec *)(skb->data + len);
1040 len += sizeof(*grec) +
1041 sizeof(struct in6_addr) * ntohs(*nsrcs);
1042
1043 /* We treat these as MLDv1 reports for now. */
1044 switch (grec->grec_type) {
1045 case MLD2_MODE_IS_INCLUDE:
1046 case MLD2_MODE_IS_EXCLUDE:
1047 case MLD2_CHANGE_TO_INCLUDE:
1048 case MLD2_CHANGE_TO_EXCLUDE:
1049 case MLD2_ALLOW_NEW_SOURCES:
1050 case MLD2_BLOCK_OLD_SOURCES:
1051 break;
1052
1053 default:
1054 continue;
1055 }
1056
1057 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
1058 vid);
1059 if (!err)
1060 break;
1061 }
1062
1063 return err;
1064}
1065#endif
1066
1067static void
1068br_multicast_update_querier_timer(struct net_bridge *br,
1069 struct bridge_mcast_querier *querier,
1070 unsigned long max_delay)
1071{
1072 if (!timer_pending(&querier->timer))
1073 querier->delay_time = jiffies + max_delay;
1074
1075 mod_timer(&querier->timer, jiffies + br->multicast_querier_interval);
1076}
1077
1078/*
1079 * Add port to router_list
1080 * list is maintained ordered by pointer value
1081 * and locked by br->multicast_lock and RCU
1082 */
1083static void br_multicast_add_router(struct net_bridge *br,
1084 struct net_bridge_port *port)
1085{
1086 struct net_bridge_port *p;
1087 struct hlist_node *slot = NULL;
1088
1089 hlist_for_each_entry(p, &br->router_list, rlist) {
1090 if ((unsigned long) port >= (unsigned long) p)
1091 break;
1092 slot = &p->rlist;
1093 }
1094
1095 if (slot)
1096 hlist_add_after_rcu(slot, &port->rlist);
1097 else
1098 hlist_add_head_rcu(&port->rlist, &br->router_list);
1099}
1100
1101static void br_multicast_mark_router(struct net_bridge *br,
1102 struct net_bridge_port *port)
1103{
1104 unsigned long now = jiffies;
1105
1106 if (!port) {
1107 if (br->multicast_router == 1)
1108 mod_timer(&br->multicast_router_timer,
1109 now + br->multicast_querier_interval);
1110 return;
1111 }
1112
1113 if (port->multicast_router != 1)
1114 return;
1115
1116 if (!hlist_unhashed(&port->rlist))
1117 goto timer;
1118
1119 br_multicast_add_router(br, port);
1120
1121timer:
1122 mod_timer(&port->multicast_router_timer,
1123 now + br->multicast_querier_interval);
1124}
1125
1126static void br_multicast_query_received(struct net_bridge *br,
1127 struct net_bridge_port *port,
1128 struct bridge_mcast_querier *querier,
1129 int saddr,
1130 bool is_general_query,
1131 unsigned long max_delay)
1132{
1133 if (saddr && is_general_query)
1134 br_multicast_update_querier_timer(br, querier, max_delay);
1135 else if (timer_pending(&querier->timer))
1136 return;
1137
1138 br_multicast_mark_router(br, port);
1139}
1140
1141static int br_ip4_multicast_query(struct net_bridge *br,
1142 struct net_bridge_port *port,
1143 struct sk_buff *skb,
1144 u16 vid)
1145{
1146 const struct iphdr *iph = ip_hdr(skb);
1147 struct igmphdr *ih = igmp_hdr(skb);
1148 struct net_bridge_mdb_entry *mp;
1149 struct igmpv3_query *ih3;
1150 struct net_bridge_port_group *p;
1151 struct net_bridge_port_group __rcu **pp;
1152 unsigned long max_delay;
1153 unsigned long now = jiffies;
1154 __be32 group;
1155 int err = 0;
1156
1157 spin_lock(&br->multicast_lock);
1158 if (!netif_running(br->dev) ||
1159 (port && port->state == BR_STATE_DISABLED))
1160 goto out;
1161
1162 group = ih->group;
1163
1164 if (skb->len == sizeof(*ih)) {
1165 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1166
1167 if (!max_delay) {
1168 max_delay = 10 * HZ;
1169 group = 0;
1170 }
1171 } else {
1172 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1173 err = -EINVAL;
1174 goto out;
1175 }
1176
1177 ih3 = igmpv3_query_hdr(skb);
1178 if (ih3->nsrcs)
1179 goto out;
1180
1181 max_delay = ih3->code ?
1182 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1183 }
1184
1185 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1186 * all-systems destination addresses (224.0.0.1) for general queries
1187 */
1188 if (!group && iph->daddr != htonl(INADDR_ALLHOSTS_GROUP)) {
1189 err = -EINVAL;
1190 goto out;
1191 }
1192
1193 br_multicast_query_received(br, port, &br->ip4_querier, !!iph->saddr,
1194 !group, max_delay);
1195
1196 if (!group)
1197 goto out;
1198
1199 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1200 if (!mp)
1201 goto out;
1202
1203 max_delay *= br->multicast_last_member_count;
1204
1205 if (mp->mglist &&
1206 (timer_pending(&mp->timer) ?
1207 time_after(mp->timer.expires, now + max_delay) :
1208 try_to_del_timer_sync(&mp->timer) >= 0))
1209 mod_timer(&mp->timer, now + max_delay);
1210
1211 for (pp = &mp->ports;
1212 (p = mlock_dereference(*pp, br)) != NULL;
1213 pp = &p->next) {
1214 if (timer_pending(&p->timer) ?
1215 time_after(p->timer.expires, now + max_delay) :
1216 try_to_del_timer_sync(&p->timer) >= 0)
1217 mod_timer(&p->timer, now + max_delay);
1218 }
1219
1220out:
1221 spin_unlock(&br->multicast_lock);
1222 return err;
1223}
1224
1225#if IS_ENABLED(CONFIG_IPV6)
1226static int br_ip6_multicast_query(struct net_bridge *br,
1227 struct net_bridge_port *port,
1228 struct sk_buff *skb,
1229 u16 vid)
1230{
1231 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1232 struct mld_msg *mld;
1233 struct net_bridge_mdb_entry *mp;
1234 struct mld2_query *mld2q;
1235 struct net_bridge_port_group *p;
1236 struct net_bridge_port_group __rcu **pp;
1237 unsigned long max_delay;
1238 unsigned long now = jiffies;
1239 const struct in6_addr *group = NULL;
1240 bool is_general_query;
1241 int err = 0;
1242
1243 spin_lock(&br->multicast_lock);
1244 if (!netif_running(br->dev) ||
1245 (port && port->state == BR_STATE_DISABLED))
1246 goto out;
1247
1248 /* RFC2710+RFC3810 (MLDv1+MLDv2) require link-local source addresses */
1249 if (!(ipv6_addr_type(&ip6h->saddr) & IPV6_ADDR_LINKLOCAL)) {
1250 err = -EINVAL;
1251 goto out;
1252 }
1253
1254 if (skb->len == sizeof(*mld)) {
1255 if (!pskb_may_pull(skb, sizeof(*mld))) {
1256 err = -EINVAL;
1257 goto out;
1258 }
1259 mld = (struct mld_msg *) icmp6_hdr(skb);
1260 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1261 if (max_delay)
1262 group = &mld->mld_mca;
1263 } else {
1264 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1265 err = -EINVAL;
1266 goto out;
1267 }
1268 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1269 if (!mld2q->mld2q_nsrcs)
1270 group = &mld2q->mld2q_mca;
1271
1272 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1273 }
1274
1275 is_general_query = group && ipv6_addr_any(group);
1276
1277 /* RFC2710+RFC3810 (MLDv1+MLDv2) require the multicast link layer
1278 * all-nodes destination address (ff02::1) for general queries
1279 */
1280 if (is_general_query && !ipv6_addr_is_ll_all_nodes(&ip6h->daddr)) {
1281 err = -EINVAL;
1282 goto out;
1283 }
1284
1285 br_multicast_query_received(br, port, &br->ip6_querier,
1286 !ipv6_addr_any(&ip6h->saddr),
1287 is_general_query, max_delay);
1288
1289 if (!group)
1290 goto out;
1291
1292 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1293 if (!mp)
1294 goto out;
1295
1296 max_delay *= br->multicast_last_member_count;
1297 if (mp->mglist &&
1298 (timer_pending(&mp->timer) ?
1299 time_after(mp->timer.expires, now + max_delay) :
1300 try_to_del_timer_sync(&mp->timer) >= 0))
1301 mod_timer(&mp->timer, now + max_delay);
1302
1303 for (pp = &mp->ports;
1304 (p = mlock_dereference(*pp, br)) != NULL;
1305 pp = &p->next) {
1306 if (timer_pending(&p->timer) ?
1307 time_after(p->timer.expires, now + max_delay) :
1308 try_to_del_timer_sync(&p->timer) >= 0)
1309 mod_timer(&p->timer, now + max_delay);
1310 }
1311
1312out:
1313 spin_unlock(&br->multicast_lock);
1314 return err;
1315}
1316#endif
1317
1318static void br_multicast_leave_group(struct net_bridge *br,
1319 struct net_bridge_port *port,
1320 struct br_ip *group,
1321 struct bridge_mcast_querier *querier,
1322 struct bridge_mcast_query *query)
1323{
1324 struct net_bridge_mdb_htable *mdb;
1325 struct net_bridge_mdb_entry *mp;
1326 struct net_bridge_port_group *p;
1327 unsigned long now;
1328 unsigned long time;
1329
1330 spin_lock(&br->multicast_lock);
1331 if (!netif_running(br->dev) ||
1332 (port && port->state == BR_STATE_DISABLED) ||
1333 timer_pending(&querier->timer))
1334 goto out;
1335
1336 mdb = mlock_dereference(br->mdb, br);
1337 mp = br_mdb_ip_get(mdb, group);
1338 if (!mp)
1339 goto out;
1340
1341 if (br->multicast_querier) {
1342 __br_multicast_send_query(br, port, &mp->addr);
1343
1344 time = jiffies + br->multicast_last_member_count *
1345 br->multicast_last_member_interval;
1346
1347 mod_timer(&query->timer, time);
1348
1349 for (p = mlock_dereference(mp->ports, br);
1350 p != NULL;
1351 p = mlock_dereference(p->next, br)) {
1352 if (p->port != port)
1353 continue;
1354
1355 if (!hlist_unhashed(&p->mglist) &&
1356 (timer_pending(&p->timer) ?
1357 time_after(p->timer.expires, time) :
1358 try_to_del_timer_sync(&p->timer) >= 0)) {
1359 mod_timer(&p->timer, time);
1360 }
1361
1362 break;
1363 }
1364 }
1365
1366 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1367 struct net_bridge_port_group __rcu **pp;
1368
1369 for (pp = &mp->ports;
1370 (p = mlock_dereference(*pp, br)) != NULL;
1371 pp = &p->next) {
1372 if (p->port != port)
1373 continue;
1374
1375 rcu_assign_pointer(*pp, p->next);
1376 hlist_del_init(&p->mglist);
1377 del_timer(&p->timer);
1378 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1379 br_mdb_notify(br->dev, port, group, RTM_DELMDB);
1380
1381 if (!mp->ports && !mp->mglist &&
1382 netif_running(br->dev))
1383 mod_timer(&mp->timer, jiffies);
1384 }
1385 goto out;
1386 }
1387
1388 now = jiffies;
1389 time = now + br->multicast_last_member_count *
1390 br->multicast_last_member_interval;
1391
1392 if (!port) {
1393 if (mp->mglist &&
1394 (timer_pending(&mp->timer) ?
1395 time_after(mp->timer.expires, time) :
1396 try_to_del_timer_sync(&mp->timer) >= 0)) {
1397 mod_timer(&mp->timer, time);
1398 }
1399
1400 goto out;
1401 }
1402
1403 for (p = mlock_dereference(mp->ports, br);
1404 p != NULL;
1405 p = mlock_dereference(p->next, br)) {
1406 if (p->port != port)
1407 continue;
1408
1409 if (!hlist_unhashed(&p->mglist) &&
1410 (timer_pending(&p->timer) ?
1411 time_after(p->timer.expires, time) :
1412 try_to_del_timer_sync(&p->timer) >= 0)) {
1413 mod_timer(&p->timer, time);
1414 }
1415
1416 break;
1417 }
1418out:
1419 spin_unlock(&br->multicast_lock);
1420}
1421
1422static void br_ip4_multicast_leave_group(struct net_bridge *br,
1423 struct net_bridge_port *port,
1424 __be32 group,
1425 __u16 vid)
1426{
1427 struct br_ip br_group;
1428 struct bridge_mcast_query *query = port ? &port->ip4_query :
1429 &br->ip4_query;
1430
1431 if (ipv4_is_local_multicast(group))
1432 return;
1433
1434 br_group.u.ip4 = group;
1435 br_group.proto = htons(ETH_P_IP);
1436 br_group.vid = vid;
1437
1438 br_multicast_leave_group(br, port, &br_group, &br->ip4_querier, query);
1439}
1440
1441#if IS_ENABLED(CONFIG_IPV6)
1442static void br_ip6_multicast_leave_group(struct net_bridge *br,
1443 struct net_bridge_port *port,
1444 const struct in6_addr *group,
1445 __u16 vid)
1446{
1447 struct br_ip br_group;
1448 struct bridge_mcast_query *query = port ? &port->ip6_query :
1449 &br->ip6_query;
1450
1451
1452 if (ipv6_addr_is_ll_all_nodes(group))
1453 return;
1454
1455 br_group.u.ip6 = *group;
1456 br_group.proto = htons(ETH_P_IPV6);
1457 br_group.vid = vid;
1458
1459 br_multicast_leave_group(br, port, &br_group, &br->ip6_querier, query);
1460}
1461#endif
1462
1463static int br_multicast_ipv4_rcv(struct net_bridge *br,
1464 struct net_bridge_port *port,
1465 struct sk_buff *skb,
1466 u16 vid)
1467{
1468 struct sk_buff *skb2 = skb;
1469 const struct iphdr *iph;
1470 struct igmphdr *ih;
1471 unsigned int len;
1472 unsigned int offset;
1473 int err;
1474
1475 /* We treat OOM as packet loss for now. */
1476 if (!pskb_may_pull(skb, sizeof(*iph)))
1477 return -EINVAL;
1478
1479 iph = ip_hdr(skb);
1480
1481 if (iph->ihl < 5 || iph->version != 4)
1482 return -EINVAL;
1483
1484 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1485 return -EINVAL;
1486
1487 iph = ip_hdr(skb);
1488
1489 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1490 return -EINVAL;
1491
1492 if (iph->protocol != IPPROTO_IGMP) {
1493 if (!ipv4_is_local_multicast(iph->daddr))
1494 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1495 return 0;
1496 }
1497
1498 len = ntohs(iph->tot_len);
1499 if (skb->len < len || len < ip_hdrlen(skb))
1500 return -EINVAL;
1501
1502 if (skb->len > len) {
1503 skb2 = skb_clone(skb, GFP_ATOMIC);
1504 if (!skb2)
1505 return -ENOMEM;
1506
1507 err = pskb_trim_rcsum(skb2, len);
1508 if (err)
1509 goto err_out;
1510 }
1511
1512 len -= ip_hdrlen(skb2);
1513 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1514 __skb_pull(skb2, offset);
1515 skb_reset_transport_header(skb2);
1516
1517 err = -EINVAL;
1518 if (!pskb_may_pull(skb2, sizeof(*ih)))
1519 goto out;
1520
1521 switch (skb2->ip_summed) {
1522 case CHECKSUM_COMPLETE:
1523 if (!csum_fold(skb2->csum))
1524 break;
1525 /* fall through */
1526 case CHECKSUM_NONE:
1527 skb2->csum = 0;
1528 if (skb_checksum_complete(skb2))
1529 goto out;
1530 }
1531
1532 err = 0;
1533
1534 BR_INPUT_SKB_CB(skb)->igmp = 1;
1535 ih = igmp_hdr(skb2);
1536
1537 switch (ih->type) {
1538 case IGMP_HOST_MEMBERSHIP_REPORT:
1539 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1540 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1541 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1542 break;
1543 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1544 err = br_ip4_multicast_igmp3_report(br, port, skb2, vid);
1545 break;
1546 case IGMP_HOST_MEMBERSHIP_QUERY:
1547 err = br_ip4_multicast_query(br, port, skb2, vid);
1548 break;
1549 case IGMP_HOST_LEAVE_MESSAGE:
1550 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1551 break;
1552 }
1553
1554out:
1555 __skb_push(skb2, offset);
1556err_out:
1557 if (skb2 != skb)
1558 kfree_skb(skb2);
1559 return err;
1560}
1561
1562#if IS_ENABLED(CONFIG_IPV6)
1563static int br_multicast_ipv6_rcv(struct net_bridge *br,
1564 struct net_bridge_port *port,
1565 struct sk_buff *skb,
1566 u16 vid)
1567{
1568 struct sk_buff *skb2;
1569 const struct ipv6hdr *ip6h;
1570 u8 icmp6_type;
1571 u8 nexthdr;
1572 __be16 frag_off;
1573 unsigned int len;
1574 int offset;
1575 int err;
1576
1577 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1578 return -EINVAL;
1579
1580 ip6h = ipv6_hdr(skb);
1581
1582 /*
1583 * We're interested in MLD messages only.
1584 * - Version is 6
1585 * - MLD has always Router Alert hop-by-hop option
1586 * - But we do not support jumbrograms.
1587 */
1588 if (ip6h->version != 6)
1589 return 0;
1590
1591 /* Prevent flooding this packet if there is no listener present */
1592 if (!ipv6_addr_is_ll_all_nodes(&ip6h->daddr))
1593 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1594
1595 if (ip6h->nexthdr != IPPROTO_HOPOPTS ||
1596 ip6h->payload_len == 0)
1597 return 0;
1598
1599 len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
1600 if (skb->len < len)
1601 return -EINVAL;
1602
1603 nexthdr = ip6h->nexthdr;
1604 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
1605
1606 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1607 return 0;
1608
1609 /* Okay, we found ICMPv6 header */
1610 skb2 = skb_clone(skb, GFP_ATOMIC);
1611 if (!skb2)
1612 return -ENOMEM;
1613
1614 err = -EINVAL;
1615 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1616 goto out;
1617
1618 len -= offset - skb_network_offset(skb2);
1619
1620 __skb_pull(skb2, offset);
1621 skb_reset_transport_header(skb2);
1622 skb_postpull_rcsum(skb2, skb_network_header(skb2),
1623 skb_network_header_len(skb2));
1624
1625 icmp6_type = icmp6_hdr(skb2)->icmp6_type;
1626
1627 switch (icmp6_type) {
1628 case ICMPV6_MGM_QUERY:
1629 case ICMPV6_MGM_REPORT:
1630 case ICMPV6_MGM_REDUCTION:
1631 case ICMPV6_MLD2_REPORT:
1632 break;
1633 default:
1634 err = 0;
1635 goto out;
1636 }
1637
1638 /* Okay, we found MLD message. Check further. */
1639 if (skb2->len > len) {
1640 err = pskb_trim_rcsum(skb2, len);
1641 if (err)
1642 goto out;
1643 err = -EINVAL;
1644 }
1645
1646 ip6h = ipv6_hdr(skb2);
1647
1648 switch (skb2->ip_summed) {
1649 case CHECKSUM_COMPLETE:
1650 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
1651 IPPROTO_ICMPV6, skb2->csum))
1652 break;
1653 /*FALLTHROUGH*/
1654 case CHECKSUM_NONE:
1655 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
1656 &ip6h->daddr,
1657 skb2->len,
1658 IPPROTO_ICMPV6, 0));
1659 if (__skb_checksum_complete(skb2))
1660 goto out;
1661 }
1662
1663 err = 0;
1664
1665 BR_INPUT_SKB_CB(skb)->igmp = 1;
1666
1667 switch (icmp6_type) {
1668 case ICMPV6_MGM_REPORT:
1669 {
1670 struct mld_msg *mld;
1671 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1672 err = -EINVAL;
1673 goto out;
1674 }
1675 mld = (struct mld_msg *)skb_transport_header(skb2);
1676 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1677 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1678 break;
1679 }
1680 case ICMPV6_MLD2_REPORT:
1681 err = br_ip6_multicast_mld2_report(br, port, skb2, vid);
1682 break;
1683 case ICMPV6_MGM_QUERY:
1684 err = br_ip6_multicast_query(br, port, skb2, vid);
1685 break;
1686 case ICMPV6_MGM_REDUCTION:
1687 {
1688 struct mld_msg *mld;
1689 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1690 err = -EINVAL;
1691 goto out;
1692 }
1693 mld = (struct mld_msg *)skb_transport_header(skb2);
1694 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1695 }
1696 }
1697
1698out:
1699 kfree_skb(skb2);
1700 return err;
1701}
1702#endif
1703
1704int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1705 struct sk_buff *skb, u16 vid)
1706{
1707 BR_INPUT_SKB_CB(skb)->igmp = 0;
1708 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1709
1710 if (br->multicast_disabled)
1711 return 0;
1712
1713 switch (skb->protocol) {
1714 case htons(ETH_P_IP):
1715 return br_multicast_ipv4_rcv(br, port, skb, vid);
1716#if IS_ENABLED(CONFIG_IPV6)
1717 case htons(ETH_P_IPV6):
1718 return br_multicast_ipv6_rcv(br, port, skb, vid);
1719#endif
1720 }
1721
1722 return 0;
1723}
1724
1725static void br_multicast_query_expired(struct net_bridge *br,
1726 struct bridge_mcast_query *query)
1727{
1728 spin_lock(&br->multicast_lock);
1729 if (query->startup_sent < br->multicast_startup_query_count)
1730 query->startup_sent++;
1731
1732 br_multicast_send_query(br, NULL, query);
1733 spin_unlock(&br->multicast_lock);
1734}
1735
1736static void br_ip4_multicast_query_expired(unsigned long data)
1737{
1738 struct net_bridge *br = (void *)data;
1739
1740 br_multicast_query_expired(br, &br->ip4_query);
1741}
1742
1743#if IS_ENABLED(CONFIG_IPV6)
1744static void br_ip6_multicast_query_expired(unsigned long data)
1745{
1746 struct net_bridge *br = (void *)data;
1747
1748 br_multicast_query_expired(br, &br->ip6_query);
1749}
1750#endif
1751
1752void br_multicast_init(struct net_bridge *br)
1753{
1754 br->hash_elasticity = 4;
1755 br->hash_max = 512;
1756
1757 br->multicast_router = 1;
1758 br->multicast_querier = 0;
1759 br->multicast_query_use_ifaddr = 0;
1760 br->multicast_last_member_count = 2;
1761 br->multicast_startup_query_count = 2;
1762
1763 br->multicast_last_member_interval = HZ;
1764 br->multicast_query_response_interval = 10 * HZ;
1765 br->multicast_startup_query_interval = 125 * HZ / 4;
1766 br->multicast_query_interval = 125 * HZ;
1767 br->multicast_querier_interval = 255 * HZ;
1768 br->multicast_membership_interval = 260 * HZ;
1769
1770 br->ip4_querier.delay_time = 0;
1771#if IS_ENABLED(CONFIG_IPV6)
1772 br->ip6_querier.delay_time = 0;
1773#endif
1774
1775 spin_lock_init(&br->multicast_lock);
1776 setup_timer(&br->multicast_router_timer,
1777 br_multicast_local_router_expired, 0);
1778 setup_timer(&br->ip4_querier.timer, br_ip4_multicast_querier_expired,
1779 (unsigned long)br);
1780 setup_timer(&br->ip4_query.timer, br_ip4_multicast_query_expired,
1781 (unsigned long)br);
1782#if IS_ENABLED(CONFIG_IPV6)
1783 setup_timer(&br->ip6_querier.timer, br_ip6_multicast_querier_expired,
1784 (unsigned long)br);
1785 setup_timer(&br->ip6_query.timer, br_ip6_multicast_query_expired,
1786 (unsigned long)br);
1787#endif
1788}
1789
1790static void __br_multicast_open(struct net_bridge *br,
1791 struct bridge_mcast_query *query)
1792{
1793 query->startup_sent = 0;
1794
1795 if (br->multicast_disabled)
1796 return;
1797
1798 mod_timer(&query->timer, jiffies);
1799}
1800
1801void br_multicast_open(struct net_bridge *br)
1802{
1803 __br_multicast_open(br, &br->ip4_query);
1804#if IS_ENABLED(CONFIG_IPV6)
1805 __br_multicast_open(br, &br->ip6_query);
1806#endif
1807}
1808
1809void br_multicast_stop(struct net_bridge *br)
1810{
1811 struct net_bridge_mdb_htable *mdb;
1812 struct net_bridge_mdb_entry *mp;
1813 struct hlist_node *n;
1814 u32 ver;
1815 int i;
1816
1817 del_timer_sync(&br->multicast_router_timer);
1818 del_timer_sync(&br->ip4_querier.timer);
1819 del_timer_sync(&br->ip4_query.timer);
1820#if IS_ENABLED(CONFIG_IPV6)
1821 del_timer_sync(&br->ip6_querier.timer);
1822 del_timer_sync(&br->ip6_query.timer);
1823#endif
1824
1825 spin_lock_bh(&br->multicast_lock);
1826 mdb = mlock_dereference(br->mdb, br);
1827 if (!mdb)
1828 goto out;
1829
1830 br->mdb = NULL;
1831
1832 ver = mdb->ver;
1833 for (i = 0; i < mdb->max; i++) {
1834 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1835 hlist[ver]) {
1836 del_timer(&mp->timer);
1837 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1838 }
1839 }
1840
1841 if (mdb->old) {
1842 spin_unlock_bh(&br->multicast_lock);
1843 rcu_barrier_bh();
1844 spin_lock_bh(&br->multicast_lock);
1845 WARN_ON(mdb->old);
1846 }
1847
1848 mdb->old = mdb;
1849 call_rcu_bh(&mdb->rcu, br_mdb_free);
1850
1851out:
1852 spin_unlock_bh(&br->multicast_lock);
1853}
1854
1855int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1856{
1857 int err = -ENOENT;
1858
1859 spin_lock_bh(&br->multicast_lock);
1860 if (!netif_running(br->dev))
1861 goto unlock;
1862
1863 switch (val) {
1864 case 0:
1865 case 2:
1866 del_timer(&br->multicast_router_timer);
1867 /* fall through */
1868 case 1:
1869 br->multicast_router = val;
1870 err = 0;
1871 break;
1872
1873 default:
1874 err = -EINVAL;
1875 break;
1876 }
1877
1878unlock:
1879 spin_unlock_bh(&br->multicast_lock);
1880
1881 return err;
1882}
1883
1884int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1885{
1886 struct net_bridge *br = p->br;
1887 int err = -ENOENT;
1888
1889 spin_lock(&br->multicast_lock);
1890 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1891 goto unlock;
1892
1893 switch (val) {
1894 case 0:
1895 case 1:
1896 case 2:
1897 p->multicast_router = val;
1898 err = 0;
1899
1900 if (val < 2 && !hlist_unhashed(&p->rlist))
1901 hlist_del_init_rcu(&p->rlist);
1902
1903 if (val == 1)
1904 break;
1905
1906 del_timer(&p->multicast_router_timer);
1907
1908 if (val == 0)
1909 break;
1910
1911 br_multicast_add_router(br, p);
1912 break;
1913
1914 default:
1915 err = -EINVAL;
1916 break;
1917 }
1918
1919unlock:
1920 spin_unlock(&br->multicast_lock);
1921
1922 return err;
1923}
1924
1925static void br_multicast_start_querier(struct net_bridge *br,
1926 struct bridge_mcast_query *query)
1927{
1928 struct net_bridge_port *port;
1929
1930 __br_multicast_open(br, query);
1931
1932 list_for_each_entry(port, &br->port_list, list) {
1933 if (port->state == BR_STATE_DISABLED ||
1934 port->state == BR_STATE_BLOCKING)
1935 continue;
1936
1937 if (query == &br->ip4_query)
1938 br_multicast_enable(&port->ip4_query);
1939#if IS_ENABLED(CONFIG_IPV6)
1940 else
1941 br_multicast_enable(&port->ip6_query);
1942#endif
1943 }
1944}
1945
1946int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1947{
1948 int err = 0;
1949 struct net_bridge_mdb_htable *mdb;
1950
1951 spin_lock_bh(&br->multicast_lock);
1952 if (br->multicast_disabled == !val)
1953 goto unlock;
1954
1955 br->multicast_disabled = !val;
1956 if (br->multicast_disabled)
1957 goto unlock;
1958
1959 if (!netif_running(br->dev))
1960 goto unlock;
1961
1962 mdb = mlock_dereference(br->mdb, br);
1963 if (mdb) {
1964 if (mdb->old) {
1965 err = -EEXIST;
1966rollback:
1967 br->multicast_disabled = !!val;
1968 goto unlock;
1969 }
1970
1971 err = br_mdb_rehash(&br->mdb, mdb->max,
1972 br->hash_elasticity);
1973 if (err)
1974 goto rollback;
1975 }
1976
1977 br_multicast_start_querier(br, &br->ip4_query);
1978#if IS_ENABLED(CONFIG_IPV6)
1979 br_multicast_start_querier(br, &br->ip6_query);
1980#endif
1981
1982unlock:
1983 spin_unlock_bh(&br->multicast_lock);
1984
1985 return err;
1986}
1987
1988int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1989{
1990 unsigned long max_delay;
1991
1992 val = !!val;
1993
1994 spin_lock_bh(&br->multicast_lock);
1995 if (br->multicast_querier == val)
1996 goto unlock;
1997
1998 br->multicast_querier = val;
1999 if (!val)
2000 goto unlock;
2001
2002 max_delay = br->multicast_query_response_interval;
2003
2004 if (!timer_pending(&br->ip4_querier.timer))
2005 br->ip4_querier.delay_time = jiffies + max_delay;
2006
2007 br_multicast_start_querier(br, &br->ip4_query);
2008
2009#if IS_ENABLED(CONFIG_IPV6)
2010 if (!timer_pending(&br->ip6_querier.timer))
2011 br->ip6_querier.delay_time = jiffies + max_delay;
2012
2013 br_multicast_start_querier(br, &br->ip6_query);
2014#endif
2015
2016unlock:
2017 spin_unlock_bh(&br->multicast_lock);
2018
2019 return 0;
2020}
2021
2022int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2023{
2024 int err = -ENOENT;
2025 u32 old;
2026 struct net_bridge_mdb_htable *mdb;
2027
2028 spin_lock_bh(&br->multicast_lock);
2029 if (!netif_running(br->dev))
2030 goto unlock;
2031
2032 err = -EINVAL;
2033 if (!is_power_of_2(val))
2034 goto unlock;
2035
2036 mdb = mlock_dereference(br->mdb, br);
2037 if (mdb && val < mdb->size)
2038 goto unlock;
2039
2040 err = 0;
2041
2042 old = br->hash_max;
2043 br->hash_max = val;
2044
2045 if (mdb) {
2046 if (mdb->old) {
2047 err = -EEXIST;
2048rollback:
2049 br->hash_max = old;
2050 goto unlock;
2051 }
2052
2053 err = br_mdb_rehash(&br->mdb, br->hash_max,
2054 br->hash_elasticity);
2055 if (err)
2056 goto rollback;
2057 }
2058
2059unlock:
2060 spin_unlock_bh(&br->multicast_lock);
2061
2062 return err;
2063}