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Merge tag 'mm-hotfixes-stable-2025-07-11-16-16' of git://git.kernel.org/pub/scm/linux...
[linux-block.git] / net / bridge / br_multicast.c
... / ...
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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 timer_delete(&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 = timer_container_of(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 = timer_container_of(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 = timer_container_of(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 = timer_container_of(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 = timer_container_of(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 = timer_container_of(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 = timer_container_of(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 = timer_container_of(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 = timer_container_of(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 = timer_container_of(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 = timer_container_of(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 = timer_container_of(pg, t,
1940 rexmit_timer);
1941 struct bridge_mcast_other_query *other_query = NULL;
1942 struct net_bridge *br = pg->key.port->br;
1943 struct net_bridge_mcast_port *pmctx;
1944 struct net_bridge_mcast *brmctx;
1945 bool need_rexmit = false;
1946
1947 spin_lock(&br->multicast_lock);
1948 if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) ||
1949 !br_opt_get(br, BROPT_MULTICAST_ENABLED))
1950 goto out;
1951
1952 pmctx = br_multicast_pg_to_port_ctx(pg);
1953 if (!pmctx)
1954 goto out;
1955 brmctx = br_multicast_port_ctx_get_global(pmctx);
1956 if (!brmctx->multicast_querier)
1957 goto out;
1958
1959 if (pg->key.addr.proto == htons(ETH_P_IP))
1960 other_query = &brmctx->ip4_other_query;
1961#if IS_ENABLED(CONFIG_IPV6)
1962 else
1963 other_query = &brmctx->ip6_other_query;
1964#endif
1965
1966 if (!other_query || timer_pending(&other_query->timer))
1967 goto out;
1968
1969 if (pg->grp_query_rexmit_cnt) {
1970 pg->grp_query_rexmit_cnt--;
1971 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr,
1972 &pg->key.addr, false, 1, NULL);
1973 }
1974 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr,
1975 &pg->key.addr, true, 0, &need_rexmit);
1976
1977 if (pg->grp_query_rexmit_cnt || need_rexmit)
1978 mod_timer(&pg->rexmit_timer, jiffies +
1979 brmctx->multicast_last_member_interval);
1980out:
1981 spin_unlock(&br->multicast_lock);
1982}
1983
1984static int br_mc_disabled_update(struct net_device *dev, bool value,
1985 struct netlink_ext_ack *extack)
1986{
1987 struct switchdev_attr attr = {
1988 .orig_dev = dev,
1989 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
1990 .flags = SWITCHDEV_F_DEFER,
1991 .u.mc_disabled = !value,
1992 };
1993
1994 return switchdev_port_attr_set(dev, &attr, extack);
1995}
1996
1997void br_multicast_port_ctx_init(struct net_bridge_port *port,
1998 struct net_bridge_vlan *vlan,
1999 struct net_bridge_mcast_port *pmctx)
2000{
2001 pmctx->port = port;
2002 pmctx->vlan = vlan;
2003 pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2004 timer_setup(&pmctx->ip4_mc_router_timer,
2005 br_ip4_multicast_router_expired, 0);
2006 timer_setup(&pmctx->ip4_own_query.timer,
2007 br_ip4_multicast_port_query_expired, 0);
2008#if IS_ENABLED(CONFIG_IPV6)
2009 timer_setup(&pmctx->ip6_mc_router_timer,
2010 br_ip6_multicast_router_expired, 0);
2011 timer_setup(&pmctx->ip6_own_query.timer,
2012 br_ip6_multicast_port_query_expired, 0);
2013#endif
2014}
2015
2016void br_multicast_port_ctx_deinit(struct net_bridge_mcast_port *pmctx)
2017{
2018 struct net_bridge *br = pmctx->port->br;
2019 bool del = false;
2020
2021#if IS_ENABLED(CONFIG_IPV6)
2022 timer_delete_sync(&pmctx->ip6_mc_router_timer);
2023#endif
2024 timer_delete_sync(&pmctx->ip4_mc_router_timer);
2025
2026 spin_lock_bh(&br->multicast_lock);
2027 del |= br_ip6_multicast_rport_del(pmctx);
2028 del |= br_ip4_multicast_rport_del(pmctx);
2029 br_multicast_rport_del_notify(pmctx, del);
2030 spin_unlock_bh(&br->multicast_lock);
2031}
2032
2033int br_multicast_add_port(struct net_bridge_port *port)
2034{
2035 int err;
2036
2037 port->multicast_eht_hosts_limit = BR_MCAST_DEFAULT_EHT_HOSTS_LIMIT;
2038 br_multicast_port_ctx_init(port, NULL, &port->multicast_ctx);
2039
2040 err = br_mc_disabled_update(port->dev,
2041 br_opt_get(port->br,
2042 BROPT_MULTICAST_ENABLED),
2043 NULL);
2044 if (err && err != -EOPNOTSUPP)
2045 return err;
2046
2047 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2048 if (!port->mcast_stats)
2049 return -ENOMEM;
2050
2051 return 0;
2052}
2053
2054void br_multicast_del_port(struct net_bridge_port *port)
2055{
2056 struct net_bridge *br = port->br;
2057 struct net_bridge_port_group *pg;
2058 struct hlist_node *n;
2059
2060 /* Take care of the remaining groups, only perm ones should be left */
2061 spin_lock_bh(&br->multicast_lock);
2062 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
2063 br_multicast_find_del_pg(br, pg);
2064 spin_unlock_bh(&br->multicast_lock);
2065 flush_work(&br->mcast_gc_work);
2066 br_multicast_port_ctx_deinit(&port->multicast_ctx);
2067 free_percpu(port->mcast_stats);
2068}
2069
2070static void br_multicast_enable(struct bridge_mcast_own_query *query)
2071{
2072 query->startup_sent = 0;
2073
2074 if (timer_delete_sync_try(&query->timer) >= 0 ||
2075 timer_delete(&query->timer))
2076 mod_timer(&query->timer, jiffies);
2077}
2078
2079static void __br_multicast_enable_port_ctx(struct net_bridge_mcast_port *pmctx)
2080{
2081 struct net_bridge *br = pmctx->port->br;
2082 struct net_bridge_mcast *brmctx;
2083
2084 brmctx = br_multicast_port_ctx_get_global(pmctx);
2085 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
2086 !netif_running(br->dev))
2087 return;
2088
2089 br_multicast_enable(&pmctx->ip4_own_query);
2090#if IS_ENABLED(CONFIG_IPV6)
2091 br_multicast_enable(&pmctx->ip6_own_query);
2092#endif
2093 if (pmctx->multicast_router == MDB_RTR_TYPE_PERM) {
2094 br_ip4_multicast_add_router(brmctx, pmctx);
2095 br_ip6_multicast_add_router(brmctx, pmctx);
2096 }
2097
2098 if (br_multicast_port_ctx_is_vlan(pmctx)) {
2099 struct net_bridge_port_group *pg;
2100 u32 n = 0;
2101
2102 /* The mcast_n_groups counter might be wrong. First,
2103 * BR_VLFLAG_MCAST_ENABLED is toggled before temporary entries
2104 * are flushed, thus mcast_n_groups after the toggle does not
2105 * reflect the true values. And second, permanent entries added
2106 * while BR_VLFLAG_MCAST_ENABLED was disabled, are not reflected
2107 * either. Thus we have to refresh the counter.
2108 */
2109
2110 hlist_for_each_entry(pg, &pmctx->port->mglist, mglist) {
2111 if (pg->key.addr.vid == pmctx->vlan->vid)
2112 n++;
2113 }
2114 WRITE_ONCE(pmctx->mdb_n_entries, n);
2115 }
2116}
2117
2118static void br_multicast_enable_port_ctx(struct net_bridge_mcast_port *pmctx)
2119{
2120 struct net_bridge *br = pmctx->port->br;
2121
2122 spin_lock_bh(&br->multicast_lock);
2123 if (br_multicast_port_ctx_is_vlan(pmctx) &&
2124 !(pmctx->vlan->priv_flags & BR_VLFLAG_MCAST_ENABLED)) {
2125 spin_unlock_bh(&br->multicast_lock);
2126 return;
2127 }
2128 __br_multicast_enable_port_ctx(pmctx);
2129 spin_unlock_bh(&br->multicast_lock);
2130}
2131
2132static void __br_multicast_disable_port_ctx(struct net_bridge_mcast_port *pmctx)
2133{
2134 struct net_bridge_port_group *pg;
2135 struct hlist_node *n;
2136 bool del = false;
2137
2138 hlist_for_each_entry_safe(pg, n, &pmctx->port->mglist, mglist)
2139 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT) &&
2140 (!br_multicast_port_ctx_is_vlan(pmctx) ||
2141 pg->key.addr.vid == pmctx->vlan->vid))
2142 br_multicast_find_del_pg(pmctx->port->br, pg);
2143
2144 del |= br_ip4_multicast_rport_del(pmctx);
2145 timer_delete(&pmctx->ip4_mc_router_timer);
2146 timer_delete(&pmctx->ip4_own_query.timer);
2147 del |= br_ip6_multicast_rport_del(pmctx);
2148#if IS_ENABLED(CONFIG_IPV6)
2149 timer_delete(&pmctx->ip6_mc_router_timer);
2150 timer_delete(&pmctx->ip6_own_query.timer);
2151#endif
2152 br_multicast_rport_del_notify(pmctx, del);
2153}
2154
2155static void br_multicast_disable_port_ctx(struct net_bridge_mcast_port *pmctx)
2156{
2157 struct net_bridge *br = pmctx->port->br;
2158
2159 spin_lock_bh(&br->multicast_lock);
2160 if (br_multicast_port_ctx_is_vlan(pmctx) &&
2161 !(pmctx->vlan->priv_flags & BR_VLFLAG_MCAST_ENABLED)) {
2162 spin_unlock_bh(&br->multicast_lock);
2163 return;
2164 }
2165
2166 __br_multicast_disable_port_ctx(pmctx);
2167 spin_unlock_bh(&br->multicast_lock);
2168}
2169
2170static void br_multicast_toggle_port(struct net_bridge_port *port, bool on)
2171{
2172#if IS_ENABLED(CONFIG_BRIDGE_VLAN_FILTERING)
2173 if (br_opt_get(port->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) {
2174 struct net_bridge_vlan_group *vg;
2175 struct net_bridge_vlan *vlan;
2176
2177 rcu_read_lock();
2178 vg = nbp_vlan_group_rcu(port);
2179 if (!vg) {
2180 rcu_read_unlock();
2181 return;
2182 }
2183
2184 /* iterate each vlan, toggle vlan multicast context */
2185 list_for_each_entry_rcu(vlan, &vg->vlan_list, vlist) {
2186 struct net_bridge_mcast_port *pmctx =
2187 &vlan->port_mcast_ctx;
2188 u8 state = br_vlan_get_state(vlan);
2189 /* enable vlan multicast context when state is
2190 * LEARNING or FORWARDING
2191 */
2192 if (on && br_vlan_state_allowed(state, true))
2193 br_multicast_enable_port_ctx(pmctx);
2194 else
2195 br_multicast_disable_port_ctx(pmctx);
2196 }
2197 rcu_read_unlock();
2198 return;
2199 }
2200#endif
2201 /* toggle port multicast context when vlan snooping is disabled */
2202 if (on)
2203 br_multicast_enable_port_ctx(&port->multicast_ctx);
2204 else
2205 br_multicast_disable_port_ctx(&port->multicast_ctx);
2206}
2207
2208void br_multicast_enable_port(struct net_bridge_port *port)
2209{
2210 br_multicast_toggle_port(port, true);
2211}
2212
2213void br_multicast_disable_port(struct net_bridge_port *port)
2214{
2215 br_multicast_toggle_port(port, false);
2216}
2217
2218static int __grp_src_delete_marked(struct net_bridge_port_group *pg)
2219{
2220 struct net_bridge_group_src *ent;
2221 struct hlist_node *tmp;
2222 int deleted = 0;
2223
2224 hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node)
2225 if (ent->flags & BR_SGRP_F_DELETE) {
2226 br_multicast_del_group_src(ent, false);
2227 deleted++;
2228 }
2229
2230 return deleted;
2231}
2232
2233static void __grp_src_mod_timer(struct net_bridge_group_src *src,
2234 unsigned long expires)
2235{
2236 mod_timer(&src->timer, expires);
2237 br_multicast_fwd_src_handle(src);
2238}
2239
2240static void __grp_src_query_marked_and_rexmit(struct net_bridge_mcast *brmctx,
2241 struct net_bridge_mcast_port *pmctx,
2242 struct net_bridge_port_group *pg)
2243{
2244 struct bridge_mcast_other_query *other_query = NULL;
2245 u32 lmqc = brmctx->multicast_last_member_count;
2246 unsigned long lmqt, lmi, now = jiffies;
2247 struct net_bridge_group_src *ent;
2248
2249 if (!netif_running(brmctx->br->dev) ||
2250 !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED))
2251 return;
2252
2253 if (pg->key.addr.proto == htons(ETH_P_IP))
2254 other_query = &brmctx->ip4_other_query;
2255#if IS_ENABLED(CONFIG_IPV6)
2256 else
2257 other_query = &brmctx->ip6_other_query;
2258#endif
2259
2260 lmqt = now + br_multicast_lmqt(brmctx);
2261 hlist_for_each_entry(ent, &pg->src_list, node) {
2262 if (ent->flags & BR_SGRP_F_SEND) {
2263 ent->flags &= ~BR_SGRP_F_SEND;
2264 if (ent->timer.expires > lmqt) {
2265 if (brmctx->multicast_querier &&
2266 other_query &&
2267 !timer_pending(&other_query->timer))
2268 ent->src_query_rexmit_cnt = lmqc;
2269 __grp_src_mod_timer(ent, lmqt);
2270 }
2271 }
2272 }
2273
2274 if (!brmctx->multicast_querier ||
2275 !other_query || timer_pending(&other_query->timer))
2276 return;
2277
2278 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr,
2279 &pg->key.addr, true, 1, NULL);
2280
2281 lmi = now + brmctx->multicast_last_member_interval;
2282 if (!timer_pending(&pg->rexmit_timer) ||
2283 time_after(pg->rexmit_timer.expires, lmi))
2284 mod_timer(&pg->rexmit_timer, lmi);
2285}
2286
2287static void __grp_send_query_and_rexmit(struct net_bridge_mcast *brmctx,
2288 struct net_bridge_mcast_port *pmctx,
2289 struct net_bridge_port_group *pg)
2290{
2291 struct bridge_mcast_other_query *other_query = NULL;
2292 unsigned long now = jiffies, lmi;
2293
2294 if (!netif_running(brmctx->br->dev) ||
2295 !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED))
2296 return;
2297
2298 if (pg->key.addr.proto == htons(ETH_P_IP))
2299 other_query = &brmctx->ip4_other_query;
2300#if IS_ENABLED(CONFIG_IPV6)
2301 else
2302 other_query = &brmctx->ip6_other_query;
2303#endif
2304
2305 if (brmctx->multicast_querier &&
2306 other_query && !timer_pending(&other_query->timer)) {
2307 lmi = now + brmctx->multicast_last_member_interval;
2308 pg->grp_query_rexmit_cnt = brmctx->multicast_last_member_count - 1;
2309 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr,
2310 &pg->key.addr, false, 0, NULL);
2311 if (!timer_pending(&pg->rexmit_timer) ||
2312 time_after(pg->rexmit_timer.expires, lmi))
2313 mod_timer(&pg->rexmit_timer, lmi);
2314 }
2315
2316 if (pg->filter_mode == MCAST_EXCLUDE &&
2317 (!timer_pending(&pg->timer) ||
2318 time_after(pg->timer.expires, now + br_multicast_lmqt(brmctx))))
2319 mod_timer(&pg->timer, now + br_multicast_lmqt(brmctx));
2320}
2321
2322/* State Msg type New state Actions
2323 * INCLUDE (A) IS_IN (B) INCLUDE (A+B) (B)=GMI
2324 * INCLUDE (A) ALLOW (B) INCLUDE (A+B) (B)=GMI
2325 * EXCLUDE (X,Y) ALLOW (A) EXCLUDE (X+A,Y-A) (A)=GMI
2326 */
2327static bool br_multicast_isinc_allow(const struct net_bridge_mcast *brmctx,
2328 struct net_bridge_port_group *pg, void *h_addr,
2329 void *srcs, u32 nsrcs, size_t addr_size,
2330 int grec_type)
2331{
2332 struct net_bridge_group_src *ent;
2333 unsigned long now = jiffies;
2334 bool changed = false;
2335 struct br_ip src_ip;
2336 u32 src_idx;
2337
2338 memset(&src_ip, 0, sizeof(src_ip));
2339 src_ip.proto = pg->key.addr.proto;
2340 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2341 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2342 ent = br_multicast_find_group_src(pg, &src_ip);
2343 if (!ent) {
2344 ent = br_multicast_new_group_src(pg, &src_ip);
2345 if (ent)
2346 changed = true;
2347 }
2348
2349 if (ent)
2350 __grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx));
2351 }
2352
2353 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2354 grec_type))
2355 changed = true;
2356
2357 return changed;
2358}
2359
2360/* State Msg type New state Actions
2361 * INCLUDE (A) IS_EX (B) EXCLUDE (A*B,B-A) (B-A)=0
2362 * Delete (A-B)
2363 * Group Timer=GMI
2364 */
2365static void __grp_src_isexc_incl(const struct net_bridge_mcast *brmctx,
2366 struct net_bridge_port_group *pg, void *h_addr,
2367 void *srcs, u32 nsrcs, size_t addr_size,
2368 int grec_type)
2369{
2370 struct net_bridge_group_src *ent;
2371 struct br_ip src_ip;
2372 u32 src_idx;
2373
2374 hlist_for_each_entry(ent, &pg->src_list, node)
2375 ent->flags |= BR_SGRP_F_DELETE;
2376
2377 memset(&src_ip, 0, sizeof(src_ip));
2378 src_ip.proto = pg->key.addr.proto;
2379 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2380 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2381 ent = br_multicast_find_group_src(pg, &src_ip);
2382 if (ent)
2383 ent->flags &= ~BR_SGRP_F_DELETE;
2384 else
2385 ent = br_multicast_new_group_src(pg, &src_ip);
2386 if (ent)
2387 br_multicast_fwd_src_handle(ent);
2388 }
2389
2390 br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2391 grec_type);
2392
2393 __grp_src_delete_marked(pg);
2394}
2395
2396/* State Msg type New state Actions
2397 * EXCLUDE (X,Y) IS_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=GMI
2398 * Delete (X-A)
2399 * Delete (Y-A)
2400 * Group Timer=GMI
2401 */
2402static bool __grp_src_isexc_excl(const struct net_bridge_mcast *brmctx,
2403 struct net_bridge_port_group *pg, void *h_addr,
2404 void *srcs, u32 nsrcs, size_t addr_size,
2405 int grec_type)
2406{
2407 struct net_bridge_group_src *ent;
2408 unsigned long now = jiffies;
2409 bool changed = false;
2410 struct br_ip src_ip;
2411 u32 src_idx;
2412
2413 hlist_for_each_entry(ent, &pg->src_list, node)
2414 ent->flags |= BR_SGRP_F_DELETE;
2415
2416 memset(&src_ip, 0, sizeof(src_ip));
2417 src_ip.proto = pg->key.addr.proto;
2418 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2419 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2420 ent = br_multicast_find_group_src(pg, &src_ip);
2421 if (ent) {
2422 ent->flags &= ~BR_SGRP_F_DELETE;
2423 } else {
2424 ent = br_multicast_new_group_src(pg, &src_ip);
2425 if (ent) {
2426 __grp_src_mod_timer(ent,
2427 now + br_multicast_gmi(brmctx));
2428 changed = true;
2429 }
2430 }
2431 }
2432
2433 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2434 grec_type))
2435 changed = true;
2436
2437 if (__grp_src_delete_marked(pg))
2438 changed = true;
2439
2440 return changed;
2441}
2442
2443static bool br_multicast_isexc(const struct net_bridge_mcast *brmctx,
2444 struct net_bridge_port_group *pg, void *h_addr,
2445 void *srcs, u32 nsrcs, size_t addr_size,
2446 int grec_type)
2447{
2448 bool changed = false;
2449
2450 switch (pg->filter_mode) {
2451 case MCAST_INCLUDE:
2452 __grp_src_isexc_incl(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2453 grec_type);
2454 br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE);
2455 changed = true;
2456 break;
2457 case MCAST_EXCLUDE:
2458 changed = __grp_src_isexc_excl(brmctx, pg, h_addr, srcs, nsrcs,
2459 addr_size, grec_type);
2460 break;
2461 }
2462
2463 pg->filter_mode = MCAST_EXCLUDE;
2464 mod_timer(&pg->timer, jiffies + br_multicast_gmi(brmctx));
2465
2466 return changed;
2467}
2468
2469/* State Msg type New state Actions
2470 * INCLUDE (A) TO_IN (B) INCLUDE (A+B) (B)=GMI
2471 * Send Q(G,A-B)
2472 */
2473static bool __grp_src_toin_incl(struct net_bridge_mcast *brmctx,
2474 struct net_bridge_mcast_port *pmctx,
2475 struct net_bridge_port_group *pg, void *h_addr,
2476 void *srcs, u32 nsrcs, size_t addr_size,
2477 int grec_type)
2478{
2479 u32 src_idx, to_send = pg->src_ents;
2480 struct net_bridge_group_src *ent;
2481 unsigned long now = jiffies;
2482 bool changed = false;
2483 struct br_ip src_ip;
2484
2485 hlist_for_each_entry(ent, &pg->src_list, node)
2486 ent->flags |= BR_SGRP_F_SEND;
2487
2488 memset(&src_ip, 0, sizeof(src_ip));
2489 src_ip.proto = pg->key.addr.proto;
2490 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2491 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2492 ent = br_multicast_find_group_src(pg, &src_ip);
2493 if (ent) {
2494 ent->flags &= ~BR_SGRP_F_SEND;
2495 to_send--;
2496 } else {
2497 ent = br_multicast_new_group_src(pg, &src_ip);
2498 if (ent)
2499 changed = true;
2500 }
2501 if (ent)
2502 __grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx));
2503 }
2504
2505 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2506 grec_type))
2507 changed = true;
2508
2509 if (to_send)
2510 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg);
2511
2512 return changed;
2513}
2514
2515/* State Msg type New state Actions
2516 * EXCLUDE (X,Y) TO_IN (A) EXCLUDE (X+A,Y-A) (A)=GMI
2517 * Send Q(G,X-A)
2518 * Send Q(G)
2519 */
2520static bool __grp_src_toin_excl(struct net_bridge_mcast *brmctx,
2521 struct net_bridge_mcast_port *pmctx,
2522 struct net_bridge_port_group *pg, void *h_addr,
2523 void *srcs, u32 nsrcs, size_t addr_size,
2524 int grec_type)
2525{
2526 u32 src_idx, to_send = pg->src_ents;
2527 struct net_bridge_group_src *ent;
2528 unsigned long now = jiffies;
2529 bool changed = false;
2530 struct br_ip src_ip;
2531
2532 hlist_for_each_entry(ent, &pg->src_list, node)
2533 if (timer_pending(&ent->timer))
2534 ent->flags |= BR_SGRP_F_SEND;
2535
2536 memset(&src_ip, 0, sizeof(src_ip));
2537 src_ip.proto = pg->key.addr.proto;
2538 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2539 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2540 ent = br_multicast_find_group_src(pg, &src_ip);
2541 if (ent) {
2542 if (timer_pending(&ent->timer)) {
2543 ent->flags &= ~BR_SGRP_F_SEND;
2544 to_send--;
2545 }
2546 } else {
2547 ent = br_multicast_new_group_src(pg, &src_ip);
2548 if (ent)
2549 changed = true;
2550 }
2551 if (ent)
2552 __grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx));
2553 }
2554
2555 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2556 grec_type))
2557 changed = true;
2558
2559 if (to_send)
2560 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg);
2561
2562 __grp_send_query_and_rexmit(brmctx, pmctx, pg);
2563
2564 return changed;
2565}
2566
2567static bool br_multicast_toin(struct net_bridge_mcast *brmctx,
2568 struct net_bridge_mcast_port *pmctx,
2569 struct net_bridge_port_group *pg, void *h_addr,
2570 void *srcs, u32 nsrcs, size_t addr_size,
2571 int grec_type)
2572{
2573 bool changed = false;
2574
2575 switch (pg->filter_mode) {
2576 case MCAST_INCLUDE:
2577 changed = __grp_src_toin_incl(brmctx, pmctx, pg, h_addr, srcs,
2578 nsrcs, addr_size, grec_type);
2579 break;
2580 case MCAST_EXCLUDE:
2581 changed = __grp_src_toin_excl(brmctx, pmctx, pg, h_addr, srcs,
2582 nsrcs, addr_size, grec_type);
2583 break;
2584 }
2585
2586 if (br_multicast_eht_should_del_pg(pg)) {
2587 pg->flags |= MDB_PG_FLAGS_FAST_LEAVE;
2588 br_multicast_find_del_pg(pg->key.port->br, pg);
2589 /* a notification has already been sent and we shouldn't
2590 * access pg after the delete so we have to return false
2591 */
2592 changed = false;
2593 }
2594
2595 return changed;
2596}
2597
2598/* State Msg type New state Actions
2599 * INCLUDE (A) TO_EX (B) EXCLUDE (A*B,B-A) (B-A)=0
2600 * Delete (A-B)
2601 * Send Q(G,A*B)
2602 * Group Timer=GMI
2603 */
2604static void __grp_src_toex_incl(struct net_bridge_mcast *brmctx,
2605 struct net_bridge_mcast_port *pmctx,
2606 struct net_bridge_port_group *pg, void *h_addr,
2607 void *srcs, u32 nsrcs, size_t addr_size,
2608 int grec_type)
2609{
2610 struct net_bridge_group_src *ent;
2611 u32 src_idx, to_send = 0;
2612 struct br_ip src_ip;
2613
2614 hlist_for_each_entry(ent, &pg->src_list, node)
2615 ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE;
2616
2617 memset(&src_ip, 0, sizeof(src_ip));
2618 src_ip.proto = pg->key.addr.proto;
2619 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2620 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2621 ent = br_multicast_find_group_src(pg, &src_ip);
2622 if (ent) {
2623 ent->flags = (ent->flags & ~BR_SGRP_F_DELETE) |
2624 BR_SGRP_F_SEND;
2625 to_send++;
2626 } else {
2627 ent = br_multicast_new_group_src(pg, &src_ip);
2628 }
2629 if (ent)
2630 br_multicast_fwd_src_handle(ent);
2631 }
2632
2633 br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2634 grec_type);
2635
2636 __grp_src_delete_marked(pg);
2637 if (to_send)
2638 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg);
2639}
2640
2641/* State Msg type New state Actions
2642 * EXCLUDE (X,Y) TO_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=Group Timer
2643 * Delete (X-A)
2644 * Delete (Y-A)
2645 * Send Q(G,A-Y)
2646 * Group Timer=GMI
2647 */
2648static bool __grp_src_toex_excl(struct net_bridge_mcast *brmctx,
2649 struct net_bridge_mcast_port *pmctx,
2650 struct net_bridge_port_group *pg, void *h_addr,
2651 void *srcs, u32 nsrcs, size_t addr_size,
2652 int grec_type)
2653{
2654 struct net_bridge_group_src *ent;
2655 u32 src_idx, to_send = 0;
2656 bool changed = false;
2657 struct br_ip src_ip;
2658
2659 hlist_for_each_entry(ent, &pg->src_list, node)
2660 ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE;
2661
2662 memset(&src_ip, 0, sizeof(src_ip));
2663 src_ip.proto = pg->key.addr.proto;
2664 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2665 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2666 ent = br_multicast_find_group_src(pg, &src_ip);
2667 if (ent) {
2668 ent->flags &= ~BR_SGRP_F_DELETE;
2669 } else {
2670 ent = br_multicast_new_group_src(pg, &src_ip);
2671 if (ent) {
2672 __grp_src_mod_timer(ent, pg->timer.expires);
2673 changed = true;
2674 }
2675 }
2676 if (ent && timer_pending(&ent->timer)) {
2677 ent->flags |= BR_SGRP_F_SEND;
2678 to_send++;
2679 }
2680 }
2681
2682 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2683 grec_type))
2684 changed = true;
2685
2686 if (__grp_src_delete_marked(pg))
2687 changed = true;
2688 if (to_send)
2689 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg);
2690
2691 return changed;
2692}
2693
2694static bool br_multicast_toex(struct net_bridge_mcast *brmctx,
2695 struct net_bridge_mcast_port *pmctx,
2696 struct net_bridge_port_group *pg, void *h_addr,
2697 void *srcs, u32 nsrcs, size_t addr_size,
2698 int grec_type)
2699{
2700 bool changed = false;
2701
2702 switch (pg->filter_mode) {
2703 case MCAST_INCLUDE:
2704 __grp_src_toex_incl(brmctx, pmctx, pg, h_addr, srcs, nsrcs,
2705 addr_size, grec_type);
2706 br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE);
2707 changed = true;
2708 break;
2709 case MCAST_EXCLUDE:
2710 changed = __grp_src_toex_excl(brmctx, pmctx, pg, h_addr, srcs,
2711 nsrcs, addr_size, grec_type);
2712 break;
2713 }
2714
2715 pg->filter_mode = MCAST_EXCLUDE;
2716 mod_timer(&pg->timer, jiffies + br_multicast_gmi(brmctx));
2717
2718 return changed;
2719}
2720
2721/* State Msg type New state Actions
2722 * INCLUDE (A) BLOCK (B) INCLUDE (A) Send Q(G,A*B)
2723 */
2724static bool __grp_src_block_incl(struct net_bridge_mcast *brmctx,
2725 struct net_bridge_mcast_port *pmctx,
2726 struct net_bridge_port_group *pg, void *h_addr,
2727 void *srcs, u32 nsrcs, size_t addr_size, int grec_type)
2728{
2729 struct net_bridge_group_src *ent;
2730 u32 src_idx, to_send = 0;
2731 bool changed = false;
2732 struct br_ip src_ip;
2733
2734 hlist_for_each_entry(ent, &pg->src_list, node)
2735 ent->flags &= ~BR_SGRP_F_SEND;
2736
2737 memset(&src_ip, 0, sizeof(src_ip));
2738 src_ip.proto = pg->key.addr.proto;
2739 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2740 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2741 ent = br_multicast_find_group_src(pg, &src_ip);
2742 if (ent) {
2743 ent->flags |= BR_SGRP_F_SEND;
2744 to_send++;
2745 }
2746 }
2747
2748 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2749 grec_type))
2750 changed = true;
2751
2752 if (to_send)
2753 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg);
2754
2755 return changed;
2756}
2757
2758/* State Msg type New state Actions
2759 * EXCLUDE (X,Y) BLOCK (A) EXCLUDE (X+(A-Y),Y) (A-X-Y)=Group Timer
2760 * Send Q(G,A-Y)
2761 */
2762static bool __grp_src_block_excl(struct net_bridge_mcast *brmctx,
2763 struct net_bridge_mcast_port *pmctx,
2764 struct net_bridge_port_group *pg, void *h_addr,
2765 void *srcs, u32 nsrcs, size_t addr_size, int grec_type)
2766{
2767 struct net_bridge_group_src *ent;
2768 u32 src_idx, to_send = 0;
2769 bool changed = false;
2770 struct br_ip src_ip;
2771
2772 hlist_for_each_entry(ent, &pg->src_list, node)
2773 ent->flags &= ~BR_SGRP_F_SEND;
2774
2775 memset(&src_ip, 0, sizeof(src_ip));
2776 src_ip.proto = pg->key.addr.proto;
2777 for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2778 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2779 ent = br_multicast_find_group_src(pg, &src_ip);
2780 if (!ent) {
2781 ent = br_multicast_new_group_src(pg, &src_ip);
2782 if (ent) {
2783 __grp_src_mod_timer(ent, pg->timer.expires);
2784 changed = true;
2785 }
2786 }
2787 if (ent && timer_pending(&ent->timer)) {
2788 ent->flags |= BR_SGRP_F_SEND;
2789 to_send++;
2790 }
2791 }
2792
2793 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2794 grec_type))
2795 changed = true;
2796
2797 if (to_send)
2798 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg);
2799
2800 return changed;
2801}
2802
2803static bool br_multicast_block(struct net_bridge_mcast *brmctx,
2804 struct net_bridge_mcast_port *pmctx,
2805 struct net_bridge_port_group *pg, void *h_addr,
2806 void *srcs, u32 nsrcs, size_t addr_size, int grec_type)
2807{
2808 bool changed = false;
2809
2810 switch (pg->filter_mode) {
2811 case MCAST_INCLUDE:
2812 changed = __grp_src_block_incl(brmctx, pmctx, pg, h_addr, srcs,
2813 nsrcs, addr_size, grec_type);
2814 break;
2815 case MCAST_EXCLUDE:
2816 changed = __grp_src_block_excl(brmctx, pmctx, pg, h_addr, srcs,
2817 nsrcs, addr_size, grec_type);
2818 break;
2819 }
2820
2821 if ((pg->filter_mode == MCAST_INCLUDE && hlist_empty(&pg->src_list)) ||
2822 br_multicast_eht_should_del_pg(pg)) {
2823 if (br_multicast_eht_should_del_pg(pg))
2824 pg->flags |= MDB_PG_FLAGS_FAST_LEAVE;
2825 br_multicast_find_del_pg(pg->key.port->br, pg);
2826 /* a notification has already been sent and we shouldn't
2827 * access pg after the delete so we have to return false
2828 */
2829 changed = false;
2830 }
2831
2832 return changed;
2833}
2834
2835static struct net_bridge_port_group *
2836br_multicast_find_port(struct net_bridge_mdb_entry *mp,
2837 struct net_bridge_port *p,
2838 const unsigned char *src)
2839{
2840 struct net_bridge *br __maybe_unused = mp->br;
2841 struct net_bridge_port_group *pg;
2842
2843 for (pg = mlock_dereference(mp->ports, br);
2844 pg;
2845 pg = mlock_dereference(pg->next, br))
2846 if (br_port_group_equal(pg, p, src))
2847 return pg;
2848
2849 return NULL;
2850}
2851
2852static int br_ip4_multicast_igmp3_report(struct net_bridge_mcast *brmctx,
2853 struct net_bridge_mcast_port *pmctx,
2854 struct sk_buff *skb,
2855 u16 vid)
2856{
2857 bool igmpv2 = brmctx->multicast_igmp_version == 2;
2858 struct net_bridge_mdb_entry *mdst;
2859 struct net_bridge_port_group *pg;
2860 const unsigned char *src;
2861 struct igmpv3_report *ih;
2862 struct igmpv3_grec *grec;
2863 int i, len, num, type;
2864 __be32 group, *h_addr;
2865 bool changed = false;
2866 int err = 0;
2867 u16 nsrcs;
2868
2869 ih = igmpv3_report_hdr(skb);
2870 num = ntohs(ih->ngrec);
2871 len = skb_transport_offset(skb) + sizeof(*ih);
2872
2873 for (i = 0; i < num; i++) {
2874 len += sizeof(*grec);
2875 if (!ip_mc_may_pull(skb, len))
2876 return -EINVAL;
2877
2878 grec = (void *)(skb->data + len - sizeof(*grec));
2879 group = grec->grec_mca;
2880 type = grec->grec_type;
2881 nsrcs = ntohs(grec->grec_nsrcs);
2882
2883 len += nsrcs * 4;
2884 if (!ip_mc_may_pull(skb, len))
2885 return -EINVAL;
2886
2887 switch (type) {
2888 case IGMPV3_MODE_IS_INCLUDE:
2889 case IGMPV3_MODE_IS_EXCLUDE:
2890 case IGMPV3_CHANGE_TO_INCLUDE:
2891 case IGMPV3_CHANGE_TO_EXCLUDE:
2892 case IGMPV3_ALLOW_NEW_SOURCES:
2893 case IGMPV3_BLOCK_OLD_SOURCES:
2894 break;
2895
2896 default:
2897 continue;
2898 }
2899
2900 src = eth_hdr(skb)->h_source;
2901 if (nsrcs == 0 &&
2902 (type == IGMPV3_CHANGE_TO_INCLUDE ||
2903 type == IGMPV3_MODE_IS_INCLUDE)) {
2904 if (!pmctx || igmpv2) {
2905 br_ip4_multicast_leave_group(brmctx, pmctx,
2906 group, vid, src);
2907 continue;
2908 }
2909 } else {
2910 err = br_ip4_multicast_add_group(brmctx, pmctx, group,
2911 vid, src, igmpv2);
2912 if (err)
2913 break;
2914 }
2915
2916 if (!pmctx || igmpv2)
2917 continue;
2918
2919 spin_lock(&brmctx->br->multicast_lock);
2920 if (!br_multicast_ctx_should_use(brmctx, pmctx))
2921 goto unlock_continue;
2922
2923 mdst = br_mdb_ip4_get(brmctx->br, group, vid);
2924 if (!mdst)
2925 goto unlock_continue;
2926 pg = br_multicast_find_port(mdst, pmctx->port, src);
2927 if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT))
2928 goto unlock_continue;
2929 /* reload grec and host addr */
2930 grec = (void *)(skb->data + len - sizeof(*grec) - (nsrcs * 4));
2931 h_addr = &ip_hdr(skb)->saddr;
2932 switch (type) {
2933 case IGMPV3_ALLOW_NEW_SOURCES:
2934 changed = br_multicast_isinc_allow(brmctx, pg, h_addr,
2935 grec->grec_src,
2936 nsrcs, sizeof(__be32), type);
2937 break;
2938 case IGMPV3_MODE_IS_INCLUDE:
2939 changed = br_multicast_isinc_allow(brmctx, pg, h_addr,
2940 grec->grec_src,
2941 nsrcs, sizeof(__be32), type);
2942 break;
2943 case IGMPV3_MODE_IS_EXCLUDE:
2944 changed = br_multicast_isexc(brmctx, pg, h_addr,
2945 grec->grec_src,
2946 nsrcs, sizeof(__be32), type);
2947 break;
2948 case IGMPV3_CHANGE_TO_INCLUDE:
2949 changed = br_multicast_toin(brmctx, pmctx, pg, h_addr,
2950 grec->grec_src,
2951 nsrcs, sizeof(__be32), type);
2952 break;
2953 case IGMPV3_CHANGE_TO_EXCLUDE:
2954 changed = br_multicast_toex(brmctx, pmctx, pg, h_addr,
2955 grec->grec_src,
2956 nsrcs, sizeof(__be32), type);
2957 break;
2958 case IGMPV3_BLOCK_OLD_SOURCES:
2959 changed = br_multicast_block(brmctx, pmctx, pg, h_addr,
2960 grec->grec_src,
2961 nsrcs, sizeof(__be32), type);
2962 break;
2963 }
2964 if (changed)
2965 br_mdb_notify(brmctx->br->dev, mdst, pg, RTM_NEWMDB);
2966unlock_continue:
2967 spin_unlock(&brmctx->br->multicast_lock);
2968 }
2969
2970 return err;
2971}
2972
2973#if IS_ENABLED(CONFIG_IPV6)
2974static int br_ip6_multicast_mld2_report(struct net_bridge_mcast *brmctx,
2975 struct net_bridge_mcast_port *pmctx,
2976 struct sk_buff *skb,
2977 u16 vid)
2978{
2979 bool mldv1 = brmctx->multicast_mld_version == 1;
2980 struct net_bridge_mdb_entry *mdst;
2981 struct net_bridge_port_group *pg;
2982 unsigned int nsrcs_offset;
2983 struct mld2_report *mld2r;
2984 const unsigned char *src;
2985 struct in6_addr *h_addr;
2986 struct mld2_grec *grec;
2987 unsigned int grec_len;
2988 bool changed = false;
2989 int i, len, num;
2990 int err = 0;
2991
2992 if (!ipv6_mc_may_pull(skb, sizeof(*mld2r)))
2993 return -EINVAL;
2994
2995 mld2r = (struct mld2_report *)icmp6_hdr(skb);
2996 num = ntohs(mld2r->mld2r_ngrec);
2997 len = skb_transport_offset(skb) + sizeof(*mld2r);
2998
2999 for (i = 0; i < num; i++) {
3000 __be16 *_nsrcs, __nsrcs;
3001 u16 nsrcs;
3002
3003 nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs);
3004
3005 if (skb_transport_offset(skb) + ipv6_transport_len(skb) <
3006 nsrcs_offset + sizeof(__nsrcs))
3007 return -EINVAL;
3008
3009 _nsrcs = skb_header_pointer(skb, nsrcs_offset,
3010 sizeof(__nsrcs), &__nsrcs);
3011 if (!_nsrcs)
3012 return -EINVAL;
3013
3014 nsrcs = ntohs(*_nsrcs);
3015 grec_len = struct_size(grec, grec_src, nsrcs);
3016
3017 if (!ipv6_mc_may_pull(skb, len + grec_len))
3018 return -EINVAL;
3019
3020 grec = (struct mld2_grec *)(skb->data + len);
3021 len += grec_len;
3022
3023 switch (grec->grec_type) {
3024 case MLD2_MODE_IS_INCLUDE:
3025 case MLD2_MODE_IS_EXCLUDE:
3026 case MLD2_CHANGE_TO_INCLUDE:
3027 case MLD2_CHANGE_TO_EXCLUDE:
3028 case MLD2_ALLOW_NEW_SOURCES:
3029 case MLD2_BLOCK_OLD_SOURCES:
3030 break;
3031
3032 default:
3033 continue;
3034 }
3035
3036 src = eth_hdr(skb)->h_source;
3037 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
3038 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
3039 nsrcs == 0) {
3040 if (!pmctx || mldv1) {
3041 br_ip6_multicast_leave_group(brmctx, pmctx,
3042 &grec->grec_mca,
3043 vid, src);
3044 continue;
3045 }
3046 } else {
3047 err = br_ip6_multicast_add_group(brmctx, pmctx,
3048 &grec->grec_mca, vid,
3049 src, mldv1);
3050 if (err)
3051 break;
3052 }
3053
3054 if (!pmctx || mldv1)
3055 continue;
3056
3057 spin_lock(&brmctx->br->multicast_lock);
3058 if (!br_multicast_ctx_should_use(brmctx, pmctx))
3059 goto unlock_continue;
3060
3061 mdst = br_mdb_ip6_get(brmctx->br, &grec->grec_mca, vid);
3062 if (!mdst)
3063 goto unlock_continue;
3064 pg = br_multicast_find_port(mdst, pmctx->port, src);
3065 if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT))
3066 goto unlock_continue;
3067 h_addr = &ipv6_hdr(skb)->saddr;
3068 switch (grec->grec_type) {
3069 case MLD2_ALLOW_NEW_SOURCES:
3070 changed = br_multicast_isinc_allow(brmctx, pg, h_addr,
3071 grec->grec_src, nsrcs,
3072 sizeof(struct in6_addr),
3073 grec->grec_type);
3074 break;
3075 case MLD2_MODE_IS_INCLUDE:
3076 changed = br_multicast_isinc_allow(brmctx, pg, h_addr,
3077 grec->grec_src, nsrcs,
3078 sizeof(struct in6_addr),
3079 grec->grec_type);
3080 break;
3081 case MLD2_MODE_IS_EXCLUDE:
3082 changed = br_multicast_isexc(brmctx, pg, h_addr,
3083 grec->grec_src, nsrcs,
3084 sizeof(struct in6_addr),
3085 grec->grec_type);
3086 break;
3087 case MLD2_CHANGE_TO_INCLUDE:
3088 changed = br_multicast_toin(brmctx, pmctx, pg, h_addr,
3089 grec->grec_src, nsrcs,
3090 sizeof(struct in6_addr),
3091 grec->grec_type);
3092 break;
3093 case MLD2_CHANGE_TO_EXCLUDE:
3094 changed = br_multicast_toex(brmctx, pmctx, pg, h_addr,
3095 grec->grec_src, nsrcs,
3096 sizeof(struct in6_addr),
3097 grec->grec_type);
3098 break;
3099 case MLD2_BLOCK_OLD_SOURCES:
3100 changed = br_multicast_block(brmctx, pmctx, pg, h_addr,
3101 grec->grec_src, nsrcs,
3102 sizeof(struct in6_addr),
3103 grec->grec_type);
3104 break;
3105 }
3106 if (changed)
3107 br_mdb_notify(brmctx->br->dev, mdst, pg, RTM_NEWMDB);
3108unlock_continue:
3109 spin_unlock(&brmctx->br->multicast_lock);
3110 }
3111
3112 return err;
3113}
3114#endif
3115
3116static bool br_multicast_select_querier(struct net_bridge_mcast *brmctx,
3117 struct net_bridge_mcast_port *pmctx,
3118 struct br_ip *saddr)
3119{
3120 int port_ifidx = pmctx ? pmctx->port->dev->ifindex : 0;
3121 struct timer_list *own_timer, *other_timer;
3122 struct bridge_mcast_querier *querier;
3123
3124 switch (saddr->proto) {
3125 case htons(ETH_P_IP):
3126 querier = &brmctx->ip4_querier;
3127 own_timer = &brmctx->ip4_own_query.timer;
3128 other_timer = &brmctx->ip4_other_query.timer;
3129 if (!querier->addr.src.ip4 ||
3130 ntohl(saddr->src.ip4) <= ntohl(querier->addr.src.ip4))
3131 goto update;
3132 break;
3133#if IS_ENABLED(CONFIG_IPV6)
3134 case htons(ETH_P_IPV6):
3135 querier = &brmctx->ip6_querier;
3136 own_timer = &brmctx->ip6_own_query.timer;
3137 other_timer = &brmctx->ip6_other_query.timer;
3138 if (ipv6_addr_cmp(&saddr->src.ip6, &querier->addr.src.ip6) <= 0)
3139 goto update;
3140 break;
3141#endif
3142 default:
3143 return false;
3144 }
3145
3146 if (!timer_pending(own_timer) && !timer_pending(other_timer))
3147 goto update;
3148
3149 return false;
3150
3151update:
3152 br_multicast_update_querier(brmctx, querier, port_ifidx, saddr);
3153
3154 return true;
3155}
3156
3157static struct net_bridge_port *
3158__br_multicast_get_querier_port(struct net_bridge *br,
3159 const struct bridge_mcast_querier *querier)
3160{
3161 int port_ifidx = READ_ONCE(querier->port_ifidx);
3162 struct net_bridge_port *p;
3163 struct net_device *dev;
3164
3165 if (port_ifidx == 0)
3166 return NULL;
3167
3168 dev = dev_get_by_index_rcu(dev_net(br->dev), port_ifidx);
3169 if (!dev)
3170 return NULL;
3171 p = br_port_get_rtnl_rcu(dev);
3172 if (!p || p->br != br)
3173 return NULL;
3174
3175 return p;
3176}
3177
3178size_t br_multicast_querier_state_size(void)
3179{
3180 return nla_total_size(0) + /* nest attribute */
3181 nla_total_size(sizeof(__be32)) + /* BRIDGE_QUERIER_IP_ADDRESS */
3182 nla_total_size(sizeof(int)) + /* BRIDGE_QUERIER_IP_PORT */
3183 nla_total_size_64bit(sizeof(u64)) + /* BRIDGE_QUERIER_IP_OTHER_TIMER */
3184#if IS_ENABLED(CONFIG_IPV6)
3185 nla_total_size(sizeof(struct in6_addr)) + /* BRIDGE_QUERIER_IPV6_ADDRESS */
3186 nla_total_size(sizeof(int)) + /* BRIDGE_QUERIER_IPV6_PORT */
3187 nla_total_size_64bit(sizeof(u64)) + /* BRIDGE_QUERIER_IPV6_OTHER_TIMER */
3188#endif
3189 0;
3190}
3191
3192/* protected by rtnl or rcu */
3193int br_multicast_dump_querier_state(struct sk_buff *skb,
3194 const struct net_bridge_mcast *brmctx,
3195 int nest_attr)
3196{
3197 struct bridge_mcast_querier querier = {};
3198 struct net_bridge_port *p;
3199 struct nlattr *nest;
3200
3201 if (!br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED) ||
3202 br_multicast_ctx_vlan_global_disabled(brmctx))
3203 return 0;
3204
3205 nest = nla_nest_start(skb, nest_attr);
3206 if (!nest)
3207 return -EMSGSIZE;
3208
3209 rcu_read_lock();
3210 if (!brmctx->multicast_querier &&
3211 !timer_pending(&brmctx->ip4_other_query.timer))
3212 goto out_v6;
3213
3214 br_multicast_read_querier(&brmctx->ip4_querier, &querier);
3215 if (nla_put_in_addr(skb, BRIDGE_QUERIER_IP_ADDRESS,
3216 querier.addr.src.ip4)) {
3217 rcu_read_unlock();
3218 goto out_err;
3219 }
3220
3221 p = __br_multicast_get_querier_port(brmctx->br, &querier);
3222 if (timer_pending(&brmctx->ip4_other_query.timer) &&
3223 (nla_put_u64_64bit(skb, BRIDGE_QUERIER_IP_OTHER_TIMER,
3224 br_timer_value(&brmctx->ip4_other_query.timer),
3225 BRIDGE_QUERIER_PAD) ||
3226 (p && nla_put_u32(skb, BRIDGE_QUERIER_IP_PORT, p->dev->ifindex)))) {
3227 rcu_read_unlock();
3228 goto out_err;
3229 }
3230
3231out_v6:
3232#if IS_ENABLED(CONFIG_IPV6)
3233 if (!brmctx->multicast_querier &&
3234 !timer_pending(&brmctx->ip6_other_query.timer))
3235 goto out;
3236
3237 br_multicast_read_querier(&brmctx->ip6_querier, &querier);
3238 if (nla_put_in6_addr(skb, BRIDGE_QUERIER_IPV6_ADDRESS,
3239 &querier.addr.src.ip6)) {
3240 rcu_read_unlock();
3241 goto out_err;
3242 }
3243
3244 p = __br_multicast_get_querier_port(brmctx->br, &querier);
3245 if (timer_pending(&brmctx->ip6_other_query.timer) &&
3246 (nla_put_u64_64bit(skb, BRIDGE_QUERIER_IPV6_OTHER_TIMER,
3247 br_timer_value(&brmctx->ip6_other_query.timer),
3248 BRIDGE_QUERIER_PAD) ||
3249 (p && nla_put_u32(skb, BRIDGE_QUERIER_IPV6_PORT,
3250 p->dev->ifindex)))) {
3251 rcu_read_unlock();
3252 goto out_err;
3253 }
3254out:
3255#endif
3256 rcu_read_unlock();
3257 nla_nest_end(skb, nest);
3258 if (!nla_len(nest))
3259 nla_nest_cancel(skb, nest);
3260
3261 return 0;
3262
3263out_err:
3264 nla_nest_cancel(skb, nest);
3265 return -EMSGSIZE;
3266}
3267
3268static void
3269br_multicast_update_query_timer(struct net_bridge_mcast *brmctx,
3270 struct bridge_mcast_other_query *query,
3271 unsigned long max_delay)
3272{
3273 if (!timer_pending(&query->timer))
3274 mod_timer(&query->delay_timer, jiffies + max_delay);
3275
3276 mod_timer(&query->timer, jiffies + brmctx->multicast_querier_interval);
3277}
3278
3279static void br_port_mc_router_state_change(struct net_bridge_port *p,
3280 bool is_mc_router)
3281{
3282 struct switchdev_attr attr = {
3283 .orig_dev = p->dev,
3284 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
3285 .flags = SWITCHDEV_F_DEFER,
3286 .u.mrouter = is_mc_router,
3287 };
3288
3289 switchdev_port_attr_set(p->dev, &attr, NULL);
3290}
3291
3292static struct net_bridge_port *
3293br_multicast_rport_from_node(struct net_bridge_mcast *brmctx,
3294 struct hlist_head *mc_router_list,
3295 struct hlist_node *rlist)
3296{
3297 struct net_bridge_mcast_port *pmctx;
3298
3299#if IS_ENABLED(CONFIG_IPV6)
3300 if (mc_router_list == &brmctx->ip6_mc_router_list)
3301 pmctx = hlist_entry(rlist, struct net_bridge_mcast_port,
3302 ip6_rlist);
3303 else
3304#endif
3305 pmctx = hlist_entry(rlist, struct net_bridge_mcast_port,
3306 ip4_rlist);
3307
3308 return pmctx->port;
3309}
3310
3311static struct hlist_node *
3312br_multicast_get_rport_slot(struct net_bridge_mcast *brmctx,
3313 struct net_bridge_port *port,
3314 struct hlist_head *mc_router_list)
3315
3316{
3317 struct hlist_node *slot = NULL;
3318 struct net_bridge_port *p;
3319 struct hlist_node *rlist;
3320
3321 hlist_for_each(rlist, mc_router_list) {
3322 p = br_multicast_rport_from_node(brmctx, mc_router_list, rlist);
3323
3324 if ((unsigned long)port >= (unsigned long)p)
3325 break;
3326
3327 slot = rlist;
3328 }
3329
3330 return slot;
3331}
3332
3333static bool br_multicast_no_router_otherpf(struct net_bridge_mcast_port *pmctx,
3334 struct hlist_node *rnode)
3335{
3336#if IS_ENABLED(CONFIG_IPV6)
3337 if (rnode != &pmctx->ip6_rlist)
3338 return hlist_unhashed(&pmctx->ip6_rlist);
3339 else
3340 return hlist_unhashed(&pmctx->ip4_rlist);
3341#else
3342 return true;
3343#endif
3344}
3345
3346/* Add port to router_list
3347 * list is maintained ordered by pointer value
3348 * and locked by br->multicast_lock and RCU
3349 */
3350static void br_multicast_add_router(struct net_bridge_mcast *brmctx,
3351 struct net_bridge_mcast_port *pmctx,
3352 struct hlist_node *rlist,
3353 struct hlist_head *mc_router_list)
3354{
3355 struct hlist_node *slot;
3356
3357 if (!hlist_unhashed(rlist))
3358 return;
3359
3360 slot = br_multicast_get_rport_slot(brmctx, pmctx->port, mc_router_list);
3361
3362 if (slot)
3363 hlist_add_behind_rcu(rlist, slot);
3364 else
3365 hlist_add_head_rcu(rlist, mc_router_list);
3366
3367 /* For backwards compatibility for now, only notify if we
3368 * switched from no IPv4/IPv6 multicast router to a new
3369 * IPv4 or IPv6 multicast router.
3370 */
3371 if (br_multicast_no_router_otherpf(pmctx, rlist)) {
3372 br_rtr_notify(pmctx->port->br->dev, pmctx, RTM_NEWMDB);
3373 br_port_mc_router_state_change(pmctx->port, true);
3374 }
3375}
3376
3377/* Add port to router_list
3378 * list is maintained ordered by pointer value
3379 * and locked by br->multicast_lock and RCU
3380 */
3381static void br_ip4_multicast_add_router(struct net_bridge_mcast *brmctx,
3382 struct net_bridge_mcast_port *pmctx)
3383{
3384 br_multicast_add_router(brmctx, pmctx, &pmctx->ip4_rlist,
3385 &brmctx->ip4_mc_router_list);
3386}
3387
3388/* Add port to router_list
3389 * list is maintained ordered by pointer value
3390 * and locked by br->multicast_lock and RCU
3391 */
3392static void br_ip6_multicast_add_router(struct net_bridge_mcast *brmctx,
3393 struct net_bridge_mcast_port *pmctx)
3394{
3395#if IS_ENABLED(CONFIG_IPV6)
3396 br_multicast_add_router(brmctx, pmctx, &pmctx->ip6_rlist,
3397 &brmctx->ip6_mc_router_list);
3398#endif
3399}
3400
3401static void br_multicast_mark_router(struct net_bridge_mcast *brmctx,
3402 struct net_bridge_mcast_port *pmctx,
3403 struct timer_list *timer,
3404 struct hlist_node *rlist,
3405 struct hlist_head *mc_router_list)
3406{
3407 unsigned long now = jiffies;
3408
3409 if (!br_multicast_ctx_should_use(brmctx, pmctx))
3410 return;
3411
3412 if (!pmctx) {
3413 if (brmctx->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
3414 if (!br_ip4_multicast_is_router(brmctx) &&
3415 !br_ip6_multicast_is_router(brmctx))
3416 br_mc_router_state_change(brmctx->br, true);
3417 mod_timer(timer, now + brmctx->multicast_querier_interval);
3418 }
3419 return;
3420 }
3421
3422 if (pmctx->multicast_router == MDB_RTR_TYPE_DISABLED ||
3423 pmctx->multicast_router == MDB_RTR_TYPE_PERM)
3424 return;
3425
3426 br_multicast_add_router(brmctx, pmctx, rlist, mc_router_list);
3427 mod_timer(timer, now + brmctx->multicast_querier_interval);
3428}
3429
3430static void br_ip4_multicast_mark_router(struct net_bridge_mcast *brmctx,
3431 struct net_bridge_mcast_port *pmctx)
3432{
3433 struct timer_list *timer = &brmctx->ip4_mc_router_timer;
3434 struct hlist_node *rlist = NULL;
3435
3436 if (pmctx) {
3437 timer = &pmctx->ip4_mc_router_timer;
3438 rlist = &pmctx->ip4_rlist;
3439 }
3440
3441 br_multicast_mark_router(brmctx, pmctx, timer, rlist,
3442 &brmctx->ip4_mc_router_list);
3443}
3444
3445static void br_ip6_multicast_mark_router(struct net_bridge_mcast *brmctx,
3446 struct net_bridge_mcast_port *pmctx)
3447{
3448#if IS_ENABLED(CONFIG_IPV6)
3449 struct timer_list *timer = &brmctx->ip6_mc_router_timer;
3450 struct hlist_node *rlist = NULL;
3451
3452 if (pmctx) {
3453 timer = &pmctx->ip6_mc_router_timer;
3454 rlist = &pmctx->ip6_rlist;
3455 }
3456
3457 br_multicast_mark_router(brmctx, pmctx, timer, rlist,
3458 &brmctx->ip6_mc_router_list);
3459#endif
3460}
3461
3462static void
3463br_ip4_multicast_query_received(struct net_bridge_mcast *brmctx,
3464 struct net_bridge_mcast_port *pmctx,
3465 struct bridge_mcast_other_query *query,
3466 struct br_ip *saddr,
3467 unsigned long max_delay)
3468{
3469 if (!br_multicast_select_querier(brmctx, pmctx, saddr))
3470 return;
3471
3472 br_multicast_update_query_timer(brmctx, query, max_delay);
3473 br_ip4_multicast_mark_router(brmctx, pmctx);
3474}
3475
3476#if IS_ENABLED(CONFIG_IPV6)
3477static void
3478br_ip6_multicast_query_received(struct net_bridge_mcast *brmctx,
3479 struct net_bridge_mcast_port *pmctx,
3480 struct bridge_mcast_other_query *query,
3481 struct br_ip *saddr,
3482 unsigned long max_delay)
3483{
3484 if (!br_multicast_select_querier(brmctx, pmctx, saddr))
3485 return;
3486
3487 br_multicast_update_query_timer(brmctx, query, max_delay);
3488 br_ip6_multicast_mark_router(brmctx, pmctx);
3489}
3490#endif
3491
3492static void br_ip4_multicast_query(struct net_bridge_mcast *brmctx,
3493 struct net_bridge_mcast_port *pmctx,
3494 struct sk_buff *skb,
3495 u16 vid)
3496{
3497 unsigned int transport_len = ip_transport_len(skb);
3498 const struct iphdr *iph = ip_hdr(skb);
3499 struct igmphdr *ih = igmp_hdr(skb);
3500 struct net_bridge_mdb_entry *mp;
3501 struct igmpv3_query *ih3;
3502 struct net_bridge_port_group *p;
3503 struct net_bridge_port_group __rcu **pp;
3504 struct br_ip saddr = {};
3505 unsigned long max_delay;
3506 unsigned long now = jiffies;
3507 __be32 group;
3508
3509 spin_lock(&brmctx->br->multicast_lock);
3510 if (!br_multicast_ctx_should_use(brmctx, pmctx))
3511 goto out;
3512
3513 group = ih->group;
3514
3515 if (transport_len == sizeof(*ih)) {
3516 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
3517
3518 if (!max_delay) {
3519 max_delay = 10 * HZ;
3520 group = 0;
3521 }
3522 } else if (transport_len >= sizeof(*ih3)) {
3523 ih3 = igmpv3_query_hdr(skb);
3524 if (ih3->nsrcs ||
3525 (brmctx->multicast_igmp_version == 3 && group &&
3526 ih3->suppress))
3527 goto out;
3528
3529 max_delay = ih3->code ?
3530 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
3531 } else {
3532 goto out;
3533 }
3534
3535 if (!group) {
3536 saddr.proto = htons(ETH_P_IP);
3537 saddr.src.ip4 = iph->saddr;
3538
3539 br_ip4_multicast_query_received(brmctx, pmctx,
3540 &brmctx->ip4_other_query,
3541 &saddr, max_delay);
3542 goto out;
3543 }
3544
3545 mp = br_mdb_ip4_get(brmctx->br, group, vid);
3546 if (!mp)
3547 goto out;
3548
3549 max_delay *= brmctx->multicast_last_member_count;
3550
3551 if (mp->host_joined &&
3552 (timer_pending(&mp->timer) ?
3553 time_after(mp->timer.expires, now + max_delay) :
3554 timer_delete_sync_try(&mp->timer) >= 0))
3555 mod_timer(&mp->timer, now + max_delay);
3556
3557 for (pp = &mp->ports;
3558 (p = mlock_dereference(*pp, brmctx->br)) != NULL;
3559 pp = &p->next) {
3560 if (timer_pending(&p->timer) ?
3561 time_after(p->timer.expires, now + max_delay) :
3562 timer_delete_sync_try(&p->timer) >= 0 &&
3563 (brmctx->multicast_igmp_version == 2 ||
3564 p->filter_mode == MCAST_EXCLUDE))
3565 mod_timer(&p->timer, now + max_delay);
3566 }
3567
3568out:
3569 spin_unlock(&brmctx->br->multicast_lock);
3570}
3571
3572#if IS_ENABLED(CONFIG_IPV6)
3573static int br_ip6_multicast_query(struct net_bridge_mcast *brmctx,
3574 struct net_bridge_mcast_port *pmctx,
3575 struct sk_buff *skb,
3576 u16 vid)
3577{
3578 unsigned int transport_len = ipv6_transport_len(skb);
3579 struct mld_msg *mld;
3580 struct net_bridge_mdb_entry *mp;
3581 struct mld2_query *mld2q;
3582 struct net_bridge_port_group *p;
3583 struct net_bridge_port_group __rcu **pp;
3584 struct br_ip saddr = {};
3585 unsigned long max_delay;
3586 unsigned long now = jiffies;
3587 unsigned int offset = skb_transport_offset(skb);
3588 const struct in6_addr *group = NULL;
3589 bool is_general_query;
3590 int err = 0;
3591
3592 spin_lock(&brmctx->br->multicast_lock);
3593 if (!br_multicast_ctx_should_use(brmctx, pmctx))
3594 goto out;
3595
3596 if (transport_len == sizeof(*mld)) {
3597 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
3598 err = -EINVAL;
3599 goto out;
3600 }
3601 mld = (struct mld_msg *) icmp6_hdr(skb);
3602 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
3603 if (max_delay)
3604 group = &mld->mld_mca;
3605 } else {
3606 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
3607 err = -EINVAL;
3608 goto out;
3609 }
3610 mld2q = (struct mld2_query *)icmp6_hdr(skb);
3611 if (!mld2q->mld2q_nsrcs)
3612 group = &mld2q->mld2q_mca;
3613 if (brmctx->multicast_mld_version == 2 &&
3614 !ipv6_addr_any(&mld2q->mld2q_mca) &&
3615 mld2q->mld2q_suppress)
3616 goto out;
3617
3618 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
3619 }
3620
3621 is_general_query = group && ipv6_addr_any(group);
3622
3623 if (is_general_query) {
3624 saddr.proto = htons(ETH_P_IPV6);
3625 saddr.src.ip6 = ipv6_hdr(skb)->saddr;
3626
3627 br_ip6_multicast_query_received(brmctx, pmctx,
3628 &brmctx->ip6_other_query,
3629 &saddr, max_delay);
3630 goto out;
3631 } else if (!group) {
3632 goto out;
3633 }
3634
3635 mp = br_mdb_ip6_get(brmctx->br, group, vid);
3636 if (!mp)
3637 goto out;
3638
3639 max_delay *= brmctx->multicast_last_member_count;
3640 if (mp->host_joined &&
3641 (timer_pending(&mp->timer) ?
3642 time_after(mp->timer.expires, now + max_delay) :
3643 timer_delete_sync_try(&mp->timer) >= 0))
3644 mod_timer(&mp->timer, now + max_delay);
3645
3646 for (pp = &mp->ports;
3647 (p = mlock_dereference(*pp, brmctx->br)) != NULL;
3648 pp = &p->next) {
3649 if (timer_pending(&p->timer) ?
3650 time_after(p->timer.expires, now + max_delay) :
3651 timer_delete_sync_try(&p->timer) >= 0 &&
3652 (brmctx->multicast_mld_version == 1 ||
3653 p->filter_mode == MCAST_EXCLUDE))
3654 mod_timer(&p->timer, now + max_delay);
3655 }
3656
3657out:
3658 spin_unlock(&brmctx->br->multicast_lock);
3659 return err;
3660}
3661#endif
3662
3663static void
3664br_multicast_leave_group(struct net_bridge_mcast *brmctx,
3665 struct net_bridge_mcast_port *pmctx,
3666 struct br_ip *group,
3667 struct bridge_mcast_other_query *other_query,
3668 struct bridge_mcast_own_query *own_query,
3669 const unsigned char *src)
3670{
3671 struct net_bridge_mdb_entry *mp;
3672 struct net_bridge_port_group *p;
3673 unsigned long now;
3674 unsigned long time;
3675
3676 spin_lock(&brmctx->br->multicast_lock);
3677 if (!br_multicast_ctx_should_use(brmctx, pmctx))
3678 goto out;
3679
3680 mp = br_mdb_ip_get(brmctx->br, group);
3681 if (!mp)
3682 goto out;
3683
3684 if (pmctx && (pmctx->port->flags & BR_MULTICAST_FAST_LEAVE)) {
3685 struct net_bridge_port_group __rcu **pp;
3686
3687 for (pp = &mp->ports;
3688 (p = mlock_dereference(*pp, brmctx->br)) != NULL;
3689 pp = &p->next) {
3690 if (!br_port_group_equal(p, pmctx->port, src))
3691 continue;
3692
3693 if (p->flags & MDB_PG_FLAGS_PERMANENT)
3694 break;
3695
3696 p->flags |= MDB_PG_FLAGS_FAST_LEAVE;
3697 br_multicast_del_pg(mp, p, pp);
3698 }
3699 goto out;
3700 }
3701
3702 if (timer_pending(&other_query->timer))
3703 goto out;
3704
3705 if (brmctx->multicast_querier) {
3706 __br_multicast_send_query(brmctx, pmctx, NULL, NULL, &mp->addr,
3707 false, 0, NULL);
3708
3709 time = jiffies + brmctx->multicast_last_member_count *
3710 brmctx->multicast_last_member_interval;
3711
3712 mod_timer(&own_query->timer, time);
3713
3714 for (p = mlock_dereference(mp->ports, brmctx->br);
3715 p != NULL && pmctx != NULL;
3716 p = mlock_dereference(p->next, brmctx->br)) {
3717 if (!br_port_group_equal(p, pmctx->port, src))
3718 continue;
3719
3720 if (!hlist_unhashed(&p->mglist) &&
3721 (timer_pending(&p->timer) ?
3722 time_after(p->timer.expires, time) :
3723 timer_delete_sync_try(&p->timer) >= 0)) {
3724 mod_timer(&p->timer, time);
3725 }
3726
3727 break;
3728 }
3729 }
3730
3731 now = jiffies;
3732 time = now + brmctx->multicast_last_member_count *
3733 brmctx->multicast_last_member_interval;
3734
3735 if (!pmctx) {
3736 if (mp->host_joined &&
3737 (timer_pending(&mp->timer) ?
3738 time_after(mp->timer.expires, time) :
3739 timer_delete_sync_try(&mp->timer) >= 0)) {
3740 mod_timer(&mp->timer, time);
3741 }
3742
3743 goto out;
3744 }
3745
3746 for (p = mlock_dereference(mp->ports, brmctx->br);
3747 p != NULL;
3748 p = mlock_dereference(p->next, brmctx->br)) {
3749 if (p->key.port != pmctx->port)
3750 continue;
3751
3752 if (!hlist_unhashed(&p->mglist) &&
3753 (timer_pending(&p->timer) ?
3754 time_after(p->timer.expires, time) :
3755 timer_delete_sync_try(&p->timer) >= 0)) {
3756 mod_timer(&p->timer, time);
3757 }
3758
3759 break;
3760 }
3761out:
3762 spin_unlock(&brmctx->br->multicast_lock);
3763}
3764
3765static void br_ip4_multicast_leave_group(struct net_bridge_mcast *brmctx,
3766 struct net_bridge_mcast_port *pmctx,
3767 __be32 group,
3768 __u16 vid,
3769 const unsigned char *src)
3770{
3771 struct br_ip br_group;
3772 struct bridge_mcast_own_query *own_query;
3773
3774 if (ipv4_is_local_multicast(group))
3775 return;
3776
3777 own_query = pmctx ? &pmctx->ip4_own_query : &brmctx->ip4_own_query;
3778
3779 memset(&br_group, 0, sizeof(br_group));
3780 br_group.dst.ip4 = group;
3781 br_group.proto = htons(ETH_P_IP);
3782 br_group.vid = vid;
3783
3784 br_multicast_leave_group(brmctx, pmctx, &br_group,
3785 &brmctx->ip4_other_query,
3786 own_query, src);
3787}
3788
3789#if IS_ENABLED(CONFIG_IPV6)
3790static void br_ip6_multicast_leave_group(struct net_bridge_mcast *brmctx,
3791 struct net_bridge_mcast_port *pmctx,
3792 const struct in6_addr *group,
3793 __u16 vid,
3794 const unsigned char *src)
3795{
3796 struct br_ip br_group;
3797 struct bridge_mcast_own_query *own_query;
3798
3799 if (ipv6_addr_is_ll_all_nodes(group))
3800 return;
3801
3802 own_query = pmctx ? &pmctx->ip6_own_query : &brmctx->ip6_own_query;
3803
3804 memset(&br_group, 0, sizeof(br_group));
3805 br_group.dst.ip6 = *group;
3806 br_group.proto = htons(ETH_P_IPV6);
3807 br_group.vid = vid;
3808
3809 br_multicast_leave_group(brmctx, pmctx, &br_group,
3810 &brmctx->ip6_other_query,
3811 own_query, src);
3812}
3813#endif
3814
3815static void br_multicast_err_count(const struct net_bridge *br,
3816 const struct net_bridge_port *p,
3817 __be16 proto)
3818{
3819 struct bridge_mcast_stats __percpu *stats;
3820 struct bridge_mcast_stats *pstats;
3821
3822 if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
3823 return;
3824
3825 if (p)
3826 stats = p->mcast_stats;
3827 else
3828 stats = br->mcast_stats;
3829 if (WARN_ON(!stats))
3830 return;
3831
3832 pstats = this_cpu_ptr(stats);
3833
3834 u64_stats_update_begin(&pstats->syncp);
3835 switch (proto) {
3836 case htons(ETH_P_IP):
3837 pstats->mstats.igmp_parse_errors++;
3838 break;
3839#if IS_ENABLED(CONFIG_IPV6)
3840 case htons(ETH_P_IPV6):
3841 pstats->mstats.mld_parse_errors++;
3842 break;
3843#endif
3844 }
3845 u64_stats_update_end(&pstats->syncp);
3846}
3847
3848static void br_multicast_pim(struct net_bridge_mcast *brmctx,
3849 struct net_bridge_mcast_port *pmctx,
3850 const struct sk_buff *skb)
3851{
3852 unsigned int offset = skb_transport_offset(skb);
3853 struct pimhdr *pimhdr, _pimhdr;
3854
3855 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
3856 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
3857 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
3858 return;
3859
3860 spin_lock(&brmctx->br->multicast_lock);
3861 br_ip4_multicast_mark_router(brmctx, pmctx);
3862 spin_unlock(&brmctx->br->multicast_lock);
3863}
3864
3865static int br_ip4_multicast_mrd_rcv(struct net_bridge_mcast *brmctx,
3866 struct net_bridge_mcast_port *pmctx,
3867 struct sk_buff *skb)
3868{
3869 if (ip_hdr(skb)->protocol != IPPROTO_IGMP ||
3870 igmp_hdr(skb)->type != IGMP_MRDISC_ADV)
3871 return -ENOMSG;
3872
3873 spin_lock(&brmctx->br->multicast_lock);
3874 br_ip4_multicast_mark_router(brmctx, pmctx);
3875 spin_unlock(&brmctx->br->multicast_lock);
3876
3877 return 0;
3878}
3879
3880static int br_multicast_ipv4_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 igmphdr *ih;
3888 int err;
3889
3890 err = ip_mc_check_igmp(skb);
3891
3892 if (err == -ENOMSG) {
3893 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
3894 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
3895 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
3896 if (ip_hdr(skb)->protocol == IPPROTO_PIM)
3897 br_multicast_pim(brmctx, pmctx, skb);
3898 } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) {
3899 br_ip4_multicast_mrd_rcv(brmctx, pmctx, skb);
3900 }
3901
3902 return 0;
3903 } else if (err < 0) {
3904 br_multicast_err_count(brmctx->br, p, skb->protocol);
3905 return err;
3906 }
3907
3908 ih = igmp_hdr(skb);
3909 src = eth_hdr(skb)->h_source;
3910 BR_INPUT_SKB_CB(skb)->igmp = ih->type;
3911
3912 switch (ih->type) {
3913 case IGMP_HOST_MEMBERSHIP_REPORT:
3914 case IGMPV2_HOST_MEMBERSHIP_REPORT:
3915 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
3916 err = br_ip4_multicast_add_group(brmctx, pmctx, ih->group, vid,
3917 src, true);
3918 break;
3919 case IGMPV3_HOST_MEMBERSHIP_REPORT:
3920 err = br_ip4_multicast_igmp3_report(brmctx, pmctx, skb, vid);
3921 break;
3922 case IGMP_HOST_MEMBERSHIP_QUERY:
3923 br_ip4_multicast_query(brmctx, pmctx, skb, vid);
3924 break;
3925 case IGMP_HOST_LEAVE_MESSAGE:
3926 br_ip4_multicast_leave_group(brmctx, pmctx, ih->group, vid, src);
3927 break;
3928 }
3929
3930 br_multicast_count(brmctx->br, p, skb, BR_INPUT_SKB_CB(skb)->igmp,
3931 BR_MCAST_DIR_RX);
3932
3933 return err;
3934}
3935
3936#if IS_ENABLED(CONFIG_IPV6)
3937static void br_ip6_multicast_mrd_rcv(struct net_bridge_mcast *brmctx,
3938 struct net_bridge_mcast_port *pmctx,
3939 struct sk_buff *skb)
3940{
3941 if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV)
3942 return;
3943
3944 spin_lock(&brmctx->br->multicast_lock);
3945 br_ip6_multicast_mark_router(brmctx, pmctx);
3946 spin_unlock(&brmctx->br->multicast_lock);
3947}
3948
3949static int br_multicast_ipv6_rcv(struct net_bridge_mcast *brmctx,
3950 struct net_bridge_mcast_port *pmctx,
3951 struct sk_buff *skb,
3952 u16 vid)
3953{
3954 struct net_bridge_port *p = pmctx ? pmctx->port : NULL;
3955 const unsigned char *src;
3956 struct mld_msg *mld;
3957 int err;
3958
3959 err = ipv6_mc_check_mld(skb);
3960
3961 if (err == -ENOMSG || err == -ENODATA) {
3962 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
3963 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
3964 if (err == -ENODATA &&
3965 ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr))
3966 br_ip6_multicast_mrd_rcv(brmctx, pmctx, skb);
3967
3968 return 0;
3969 } else if (err < 0) {
3970 br_multicast_err_count(brmctx->br, p, skb->protocol);
3971 return err;
3972 }
3973
3974 mld = (struct mld_msg *)skb_transport_header(skb);
3975 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
3976
3977 switch (mld->mld_type) {
3978 case ICMPV6_MGM_REPORT:
3979 src = eth_hdr(skb)->h_source;
3980 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
3981 err = br_ip6_multicast_add_group(brmctx, pmctx, &mld->mld_mca,
3982 vid, src, true);
3983 break;
3984 case ICMPV6_MLD2_REPORT:
3985 err = br_ip6_multicast_mld2_report(brmctx, pmctx, skb, vid);
3986 break;
3987 case ICMPV6_MGM_QUERY:
3988 err = br_ip6_multicast_query(brmctx, pmctx, skb, vid);
3989 break;
3990 case ICMPV6_MGM_REDUCTION:
3991 src = eth_hdr(skb)->h_source;
3992 br_ip6_multicast_leave_group(brmctx, pmctx, &mld->mld_mca, vid,
3993 src);
3994 break;
3995 }
3996
3997 br_multicast_count(brmctx->br, p, skb, BR_INPUT_SKB_CB(skb)->igmp,
3998 BR_MCAST_DIR_RX);
3999
4000 return err;
4001}
4002#endif
4003
4004int br_multicast_rcv(struct net_bridge_mcast **brmctx,
4005 struct net_bridge_mcast_port **pmctx,
4006 struct net_bridge_vlan *vlan,
4007 struct sk_buff *skb, u16 vid)
4008{
4009 int ret = 0;
4010
4011 BR_INPUT_SKB_CB(skb)->igmp = 0;
4012 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
4013
4014 if (!br_opt_get((*brmctx)->br, BROPT_MULTICAST_ENABLED))
4015 return 0;
4016
4017 if (br_opt_get((*brmctx)->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) && vlan) {
4018 const struct net_bridge_vlan *masterv;
4019
4020 /* the vlan has the master flag set only when transmitting
4021 * through the bridge device
4022 */
4023 if (br_vlan_is_master(vlan)) {
4024 masterv = vlan;
4025 *brmctx = &vlan->br_mcast_ctx;
4026 *pmctx = NULL;
4027 } else {
4028 masterv = vlan->brvlan;
4029 *brmctx = &vlan->brvlan->br_mcast_ctx;
4030 *pmctx = &vlan->port_mcast_ctx;
4031 }
4032
4033 if (!(masterv->priv_flags & BR_VLFLAG_GLOBAL_MCAST_ENABLED))
4034 return 0;
4035 }
4036
4037 switch (skb->protocol) {
4038 case htons(ETH_P_IP):
4039 ret = br_multicast_ipv4_rcv(*brmctx, *pmctx, skb, vid);
4040 break;
4041#if IS_ENABLED(CONFIG_IPV6)
4042 case htons(ETH_P_IPV6):
4043 ret = br_multicast_ipv6_rcv(*brmctx, *pmctx, skb, vid);
4044 break;
4045#endif
4046 }
4047
4048 return ret;
4049}
4050
4051static void br_multicast_query_expired(struct net_bridge_mcast *brmctx,
4052 struct bridge_mcast_own_query *query,
4053 struct bridge_mcast_querier *querier)
4054{
4055 spin_lock(&brmctx->br->multicast_lock);
4056 if (br_multicast_ctx_vlan_disabled(brmctx))
4057 goto out;
4058
4059 if (query->startup_sent < brmctx->multicast_startup_query_count)
4060 query->startup_sent++;
4061
4062 br_multicast_send_query(brmctx, NULL, query);
4063out:
4064 spin_unlock(&brmctx->br->multicast_lock);
4065}
4066
4067static void br_ip4_multicast_query_expired(struct timer_list *t)
4068{
4069 struct net_bridge_mcast *brmctx = timer_container_of(brmctx, t,
4070 ip4_own_query.timer);
4071
4072 br_multicast_query_expired(brmctx, &brmctx->ip4_own_query,
4073 &brmctx->ip4_querier);
4074}
4075
4076#if IS_ENABLED(CONFIG_IPV6)
4077static void br_ip6_multicast_query_expired(struct timer_list *t)
4078{
4079 struct net_bridge_mcast *brmctx = timer_container_of(brmctx, t,
4080 ip6_own_query.timer);
4081
4082 br_multicast_query_expired(brmctx, &brmctx->ip6_own_query,
4083 &brmctx->ip6_querier);
4084}
4085#endif
4086
4087static void br_multicast_gc_work(struct work_struct *work)
4088{
4089 struct net_bridge *br = container_of(work, struct net_bridge,
4090 mcast_gc_work);
4091 HLIST_HEAD(deleted_head);
4092
4093 spin_lock_bh(&br->multicast_lock);
4094 hlist_move_list(&br->mcast_gc_list, &deleted_head);
4095 spin_unlock_bh(&br->multicast_lock);
4096
4097 br_multicast_gc(&deleted_head);
4098}
4099
4100void br_multicast_ctx_init(struct net_bridge *br,
4101 struct net_bridge_vlan *vlan,
4102 struct net_bridge_mcast *brmctx)
4103{
4104 brmctx->br = br;
4105 brmctx->vlan = vlan;
4106 brmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
4107 brmctx->multicast_last_member_count = 2;
4108 brmctx->multicast_startup_query_count = 2;
4109
4110 brmctx->multicast_last_member_interval = HZ;
4111 brmctx->multicast_query_response_interval = 10 * HZ;
4112 brmctx->multicast_startup_query_interval = 125 * HZ / 4;
4113 brmctx->multicast_query_interval = 125 * HZ;
4114 brmctx->multicast_querier_interval = 255 * HZ;
4115 brmctx->multicast_membership_interval = 260 * HZ;
4116
4117 brmctx->ip4_querier.port_ifidx = 0;
4118 seqcount_spinlock_init(&brmctx->ip4_querier.seq, &br->multicast_lock);
4119 brmctx->multicast_igmp_version = 2;
4120#if IS_ENABLED(CONFIG_IPV6)
4121 brmctx->multicast_mld_version = 1;
4122 brmctx->ip6_querier.port_ifidx = 0;
4123 seqcount_spinlock_init(&brmctx->ip6_querier.seq, &br->multicast_lock);
4124#endif
4125
4126 timer_setup(&brmctx->ip4_mc_router_timer,
4127 br_ip4_multicast_local_router_expired, 0);
4128 timer_setup(&brmctx->ip4_other_query.timer,
4129 br_ip4_multicast_querier_expired, 0);
4130 timer_setup(&brmctx->ip4_other_query.delay_timer,
4131 br_multicast_query_delay_expired, 0);
4132 timer_setup(&brmctx->ip4_own_query.timer,
4133 br_ip4_multicast_query_expired, 0);
4134#if IS_ENABLED(CONFIG_IPV6)
4135 timer_setup(&brmctx->ip6_mc_router_timer,
4136 br_ip6_multicast_local_router_expired, 0);
4137 timer_setup(&brmctx->ip6_other_query.timer,
4138 br_ip6_multicast_querier_expired, 0);
4139 timer_setup(&brmctx->ip6_other_query.delay_timer,
4140 br_multicast_query_delay_expired, 0);
4141 timer_setup(&brmctx->ip6_own_query.timer,
4142 br_ip6_multicast_query_expired, 0);
4143#endif
4144}
4145
4146void br_multicast_ctx_deinit(struct net_bridge_mcast *brmctx)
4147{
4148 __br_multicast_stop(brmctx);
4149}
4150
4151void br_multicast_init(struct net_bridge *br)
4152{
4153 br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX;
4154
4155 br_multicast_ctx_init(br, NULL, &br->multicast_ctx);
4156
4157 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true);
4158 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
4159
4160 spin_lock_init(&br->multicast_lock);
4161 INIT_HLIST_HEAD(&br->mdb_list);
4162 INIT_HLIST_HEAD(&br->mcast_gc_list);
4163 INIT_WORK(&br->mcast_gc_work, br_multicast_gc_work);
4164}
4165
4166static void br_ip4_multicast_join_snoopers(struct net_bridge *br)
4167{
4168 struct in_device *in_dev = in_dev_get(br->dev);
4169
4170 if (!in_dev)
4171 return;
4172
4173 __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
4174 in_dev_put(in_dev);
4175}
4176
4177#if IS_ENABLED(CONFIG_IPV6)
4178static void br_ip6_multicast_join_snoopers(struct net_bridge *br)
4179{
4180 struct in6_addr addr;
4181
4182 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
4183 ipv6_dev_mc_inc(br->dev, &addr);
4184}
4185#else
4186static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br)
4187{
4188}
4189#endif
4190
4191void br_multicast_join_snoopers(struct net_bridge *br)
4192{
4193 br_ip4_multicast_join_snoopers(br);
4194 br_ip6_multicast_join_snoopers(br);
4195}
4196
4197static void br_ip4_multicast_leave_snoopers(struct net_bridge *br)
4198{
4199 struct in_device *in_dev = in_dev_get(br->dev);
4200
4201 if (WARN_ON(!in_dev))
4202 return;
4203
4204 __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
4205 in_dev_put(in_dev);
4206}
4207
4208#if IS_ENABLED(CONFIG_IPV6)
4209static void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
4210{
4211 struct in6_addr addr;
4212
4213 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
4214 ipv6_dev_mc_dec(br->dev, &addr);
4215}
4216#else
4217static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
4218{
4219}
4220#endif
4221
4222void br_multicast_leave_snoopers(struct net_bridge *br)
4223{
4224 br_ip4_multicast_leave_snoopers(br);
4225 br_ip6_multicast_leave_snoopers(br);
4226}
4227
4228static void __br_multicast_open_query(struct net_bridge *br,
4229 struct bridge_mcast_own_query *query)
4230{
4231 query->startup_sent = 0;
4232
4233 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
4234 return;
4235
4236 mod_timer(&query->timer, jiffies);
4237}
4238
4239static void __br_multicast_open(struct net_bridge_mcast *brmctx)
4240{
4241 __br_multicast_open_query(brmctx->br, &brmctx->ip4_own_query);
4242#if IS_ENABLED(CONFIG_IPV6)
4243 __br_multicast_open_query(brmctx->br, &brmctx->ip6_own_query);
4244#endif
4245}
4246
4247void br_multicast_open(struct net_bridge *br)
4248{
4249 ASSERT_RTNL();
4250
4251 if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) {
4252 struct net_bridge_vlan_group *vg;
4253 struct net_bridge_vlan *vlan;
4254
4255 vg = br_vlan_group(br);
4256 if (vg) {
4257 list_for_each_entry(vlan, &vg->vlan_list, vlist) {
4258 struct net_bridge_mcast *brmctx;
4259
4260 brmctx = &vlan->br_mcast_ctx;
4261 if (br_vlan_is_brentry(vlan) &&
4262 !br_multicast_ctx_vlan_disabled(brmctx))
4263 __br_multicast_open(&vlan->br_mcast_ctx);
4264 }
4265 }
4266 } else {
4267 __br_multicast_open(&br->multicast_ctx);
4268 }
4269}
4270
4271static void __br_multicast_stop(struct net_bridge_mcast *brmctx)
4272{
4273 timer_delete_sync(&brmctx->ip4_mc_router_timer);
4274 timer_delete_sync(&brmctx->ip4_other_query.timer);
4275 timer_delete_sync(&brmctx->ip4_other_query.delay_timer);
4276 timer_delete_sync(&brmctx->ip4_own_query.timer);
4277#if IS_ENABLED(CONFIG_IPV6)
4278 timer_delete_sync(&brmctx->ip6_mc_router_timer);
4279 timer_delete_sync(&brmctx->ip6_other_query.timer);
4280 timer_delete_sync(&brmctx->ip6_other_query.delay_timer);
4281 timer_delete_sync(&brmctx->ip6_own_query.timer);
4282#endif
4283}
4284
4285void br_multicast_update_vlan_mcast_ctx(struct net_bridge_vlan *v, u8 state)
4286{
4287#if IS_ENABLED(CONFIG_BRIDGE_VLAN_FILTERING)
4288 struct net_bridge *br;
4289
4290 if (!br_vlan_should_use(v))
4291 return;
4292
4293 if (br_vlan_is_master(v))
4294 return;
4295
4296 br = v->port->br;
4297
4298 if (!br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED))
4299 return;
4300
4301 if (br_vlan_state_allowed(state, true))
4302 br_multicast_enable_port_ctx(&v->port_mcast_ctx);
4303
4304 /* Multicast is not disabled for the vlan when it goes in
4305 * blocking state because the timers will expire and stop by
4306 * themselves without sending more queries.
4307 */
4308#endif
4309}
4310
4311void br_multicast_toggle_one_vlan(struct net_bridge_vlan *vlan, bool on)
4312{
4313 struct net_bridge *br;
4314
4315 /* it's okay to check for the flag without the multicast lock because it
4316 * can only change under RTNL -> multicast_lock, we need the latter to
4317 * sync with timers and packets
4318 */
4319 if (on == !!(vlan->priv_flags & BR_VLFLAG_MCAST_ENABLED))
4320 return;
4321
4322 if (br_vlan_is_master(vlan)) {
4323 br = vlan->br;
4324
4325 if (!br_vlan_is_brentry(vlan) ||
4326 (on &&
4327 br_multicast_ctx_vlan_global_disabled(&vlan->br_mcast_ctx)))
4328 return;
4329
4330 spin_lock_bh(&br->multicast_lock);
4331 vlan->priv_flags ^= BR_VLFLAG_MCAST_ENABLED;
4332 spin_unlock_bh(&br->multicast_lock);
4333
4334 if (on)
4335 __br_multicast_open(&vlan->br_mcast_ctx);
4336 else
4337 __br_multicast_stop(&vlan->br_mcast_ctx);
4338 } else {
4339 struct net_bridge_mcast *brmctx;
4340
4341 brmctx = br_multicast_port_ctx_get_global(&vlan->port_mcast_ctx);
4342 if (on && br_multicast_ctx_vlan_global_disabled(brmctx))
4343 return;
4344
4345 br = vlan->port->br;
4346 spin_lock_bh(&br->multicast_lock);
4347 vlan->priv_flags ^= BR_VLFLAG_MCAST_ENABLED;
4348 if (on)
4349 __br_multicast_enable_port_ctx(&vlan->port_mcast_ctx);
4350 else
4351 __br_multicast_disable_port_ctx(&vlan->port_mcast_ctx);
4352 spin_unlock_bh(&br->multicast_lock);
4353 }
4354}
4355
4356static void br_multicast_toggle_vlan(struct net_bridge_vlan *vlan, bool on)
4357{
4358 struct net_bridge_port *p;
4359
4360 if (WARN_ON_ONCE(!br_vlan_is_master(vlan)))
4361 return;
4362
4363 list_for_each_entry(p, &vlan->br->port_list, list) {
4364 struct net_bridge_vlan *vport;
4365
4366 vport = br_vlan_find(nbp_vlan_group(p), vlan->vid);
4367 if (!vport)
4368 continue;
4369 br_multicast_toggle_one_vlan(vport, on);
4370 }
4371
4372 if (br_vlan_is_brentry(vlan))
4373 br_multicast_toggle_one_vlan(vlan, on);
4374}
4375
4376int br_multicast_toggle_vlan_snooping(struct net_bridge *br, bool on,
4377 struct netlink_ext_ack *extack)
4378{
4379 struct net_bridge_vlan_group *vg;
4380 struct net_bridge_vlan *vlan;
4381 struct net_bridge_port *p;
4382
4383 if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) == on)
4384 return 0;
4385
4386 if (on && !br_opt_get(br, BROPT_VLAN_ENABLED)) {
4387 NL_SET_ERR_MSG_MOD(extack, "Cannot enable multicast vlan snooping with vlan filtering disabled");
4388 return -EINVAL;
4389 }
4390
4391 vg = br_vlan_group(br);
4392 if (!vg)
4393 return 0;
4394
4395 br_opt_toggle(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED, on);
4396
4397 /* disable/enable non-vlan mcast contexts based on vlan snooping */
4398 if (on)
4399 __br_multicast_stop(&br->multicast_ctx);
4400 else
4401 __br_multicast_open(&br->multicast_ctx);
4402 list_for_each_entry(p, &br->port_list, list) {
4403 if (on)
4404 br_multicast_disable_port_ctx(&p->multicast_ctx);
4405 else
4406 br_multicast_enable_port_ctx(&p->multicast_ctx);
4407 }
4408
4409 list_for_each_entry(vlan, &vg->vlan_list, vlist)
4410 br_multicast_toggle_vlan(vlan, on);
4411
4412 return 0;
4413}
4414
4415bool br_multicast_toggle_global_vlan(struct net_bridge_vlan *vlan, bool on)
4416{
4417 ASSERT_RTNL();
4418
4419 /* BR_VLFLAG_GLOBAL_MCAST_ENABLED relies on eventual consistency and
4420 * requires only RTNL to change
4421 */
4422 if (on == !!(vlan->priv_flags & BR_VLFLAG_GLOBAL_MCAST_ENABLED))
4423 return false;
4424
4425 vlan->priv_flags ^= BR_VLFLAG_GLOBAL_MCAST_ENABLED;
4426 br_multicast_toggle_vlan(vlan, on);
4427
4428 return true;
4429}
4430
4431void br_multicast_stop(struct net_bridge *br)
4432{
4433 ASSERT_RTNL();
4434
4435 if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) {
4436 struct net_bridge_vlan_group *vg;
4437 struct net_bridge_vlan *vlan;
4438
4439 vg = br_vlan_group(br);
4440 if (vg) {
4441 list_for_each_entry(vlan, &vg->vlan_list, vlist) {
4442 struct net_bridge_mcast *brmctx;
4443
4444 brmctx = &vlan->br_mcast_ctx;
4445 if (br_vlan_is_brentry(vlan) &&
4446 !br_multicast_ctx_vlan_disabled(brmctx))
4447 __br_multicast_stop(&vlan->br_mcast_ctx);
4448 }
4449 }
4450 } else {
4451 __br_multicast_stop(&br->multicast_ctx);
4452 }
4453}
4454
4455void br_multicast_dev_del(struct net_bridge *br)
4456{
4457 struct net_bridge_mdb_entry *mp;
4458 HLIST_HEAD(deleted_head);
4459 struct hlist_node *tmp;
4460
4461 spin_lock_bh(&br->multicast_lock);
4462 hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node)
4463 br_multicast_del_mdb_entry(mp);
4464 hlist_move_list(&br->mcast_gc_list, &deleted_head);
4465 spin_unlock_bh(&br->multicast_lock);
4466
4467 br_multicast_ctx_deinit(&br->multicast_ctx);
4468 br_multicast_gc(&deleted_head);
4469 cancel_work_sync(&br->mcast_gc_work);
4470
4471 rcu_barrier();
4472}
4473
4474int br_multicast_set_router(struct net_bridge_mcast *brmctx, unsigned long val)
4475{
4476 int err = -EINVAL;
4477
4478 spin_lock_bh(&brmctx->br->multicast_lock);
4479
4480 switch (val) {
4481 case MDB_RTR_TYPE_DISABLED:
4482 case MDB_RTR_TYPE_PERM:
4483 br_mc_router_state_change(brmctx->br, val == MDB_RTR_TYPE_PERM);
4484 timer_delete(&brmctx->ip4_mc_router_timer);
4485#if IS_ENABLED(CONFIG_IPV6)
4486 timer_delete(&brmctx->ip6_mc_router_timer);
4487#endif
4488 brmctx->multicast_router = val;
4489 err = 0;
4490 break;
4491 case MDB_RTR_TYPE_TEMP_QUERY:
4492 if (brmctx->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
4493 br_mc_router_state_change(brmctx->br, false);
4494 brmctx->multicast_router = val;
4495 err = 0;
4496 break;
4497 }
4498
4499 spin_unlock_bh(&brmctx->br->multicast_lock);
4500
4501 return err;
4502}
4503
4504static void
4505br_multicast_rport_del_notify(struct net_bridge_mcast_port *pmctx, bool deleted)
4506{
4507 if (!deleted)
4508 return;
4509
4510 /* For backwards compatibility for now, only notify if there is
4511 * no multicast router anymore for both IPv4 and IPv6.
4512 */
4513 if (!hlist_unhashed(&pmctx->ip4_rlist))
4514 return;
4515#if IS_ENABLED(CONFIG_IPV6)
4516 if (!hlist_unhashed(&pmctx->ip6_rlist))
4517 return;
4518#endif
4519
4520 br_rtr_notify(pmctx->port->br->dev, pmctx, RTM_DELMDB);
4521 br_port_mc_router_state_change(pmctx->port, false);
4522
4523 /* don't allow timer refresh */
4524 if (pmctx->multicast_router == MDB_RTR_TYPE_TEMP)
4525 pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
4526}
4527
4528int br_multicast_set_port_router(struct net_bridge_mcast_port *pmctx,
4529 unsigned long val)
4530{
4531 struct net_bridge_mcast *brmctx;
4532 unsigned long now = jiffies;
4533 int err = -EINVAL;
4534 bool del = false;
4535
4536 brmctx = br_multicast_port_ctx_get_global(pmctx);
4537 spin_lock_bh(&brmctx->br->multicast_lock);
4538 if (pmctx->multicast_router == val) {
4539 /* Refresh the temp router port timer */
4540 if (pmctx->multicast_router == MDB_RTR_TYPE_TEMP) {
4541 mod_timer(&pmctx->ip4_mc_router_timer,
4542 now + brmctx->multicast_querier_interval);
4543#if IS_ENABLED(CONFIG_IPV6)
4544 mod_timer(&pmctx->ip6_mc_router_timer,
4545 now + brmctx->multicast_querier_interval);
4546#endif
4547 }
4548 err = 0;
4549 goto unlock;
4550 }
4551 switch (val) {
4552 case MDB_RTR_TYPE_DISABLED:
4553 pmctx->multicast_router = MDB_RTR_TYPE_DISABLED;
4554 del |= br_ip4_multicast_rport_del(pmctx);
4555 timer_delete(&pmctx->ip4_mc_router_timer);
4556 del |= br_ip6_multicast_rport_del(pmctx);
4557#if IS_ENABLED(CONFIG_IPV6)
4558 timer_delete(&pmctx->ip6_mc_router_timer);
4559#endif
4560 br_multicast_rport_del_notify(pmctx, del);
4561 break;
4562 case MDB_RTR_TYPE_TEMP_QUERY:
4563 pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
4564 del |= br_ip4_multicast_rport_del(pmctx);
4565 del |= br_ip6_multicast_rport_del(pmctx);
4566 br_multicast_rport_del_notify(pmctx, del);
4567 break;
4568 case MDB_RTR_TYPE_PERM:
4569 pmctx->multicast_router = MDB_RTR_TYPE_PERM;
4570 timer_delete(&pmctx->ip4_mc_router_timer);
4571 br_ip4_multicast_add_router(brmctx, pmctx);
4572#if IS_ENABLED(CONFIG_IPV6)
4573 timer_delete(&pmctx->ip6_mc_router_timer);
4574#endif
4575 br_ip6_multicast_add_router(brmctx, pmctx);
4576 break;
4577 case MDB_RTR_TYPE_TEMP:
4578 pmctx->multicast_router = MDB_RTR_TYPE_TEMP;
4579 br_ip4_multicast_mark_router(brmctx, pmctx);
4580 br_ip6_multicast_mark_router(brmctx, pmctx);
4581 break;
4582 default:
4583 goto unlock;
4584 }
4585 err = 0;
4586unlock:
4587 spin_unlock_bh(&brmctx->br->multicast_lock);
4588
4589 return err;
4590}
4591
4592int br_multicast_set_vlan_router(struct net_bridge_vlan *v, u8 mcast_router)
4593{
4594 int err;
4595
4596 if (br_vlan_is_master(v))
4597 err = br_multicast_set_router(&v->br_mcast_ctx, mcast_router);
4598 else
4599 err = br_multicast_set_port_router(&v->port_mcast_ctx,
4600 mcast_router);
4601
4602 return err;
4603}
4604
4605static void br_multicast_start_querier(struct net_bridge_mcast *brmctx,
4606 struct bridge_mcast_own_query *query)
4607{
4608 struct net_bridge_port *port;
4609
4610 if (!br_multicast_ctx_matches_vlan_snooping(brmctx))
4611 return;
4612
4613 __br_multicast_open_query(brmctx->br, query);
4614
4615 rcu_read_lock();
4616 list_for_each_entry_rcu(port, &brmctx->br->port_list, list) {
4617 struct bridge_mcast_own_query *ip4_own_query;
4618#if IS_ENABLED(CONFIG_IPV6)
4619 struct bridge_mcast_own_query *ip6_own_query;
4620#endif
4621
4622 if (br_multicast_port_ctx_state_stopped(&port->multicast_ctx))
4623 continue;
4624
4625 if (br_multicast_ctx_is_vlan(brmctx)) {
4626 struct net_bridge_vlan *vlan;
4627
4628 vlan = br_vlan_find(nbp_vlan_group_rcu(port),
4629 brmctx->vlan->vid);
4630 if (!vlan ||
4631 br_multicast_port_ctx_state_stopped(&vlan->port_mcast_ctx))
4632 continue;
4633
4634 ip4_own_query = &vlan->port_mcast_ctx.ip4_own_query;
4635#if IS_ENABLED(CONFIG_IPV6)
4636 ip6_own_query = &vlan->port_mcast_ctx.ip6_own_query;
4637#endif
4638 } else {
4639 ip4_own_query = &port->multicast_ctx.ip4_own_query;
4640#if IS_ENABLED(CONFIG_IPV6)
4641 ip6_own_query = &port->multicast_ctx.ip6_own_query;
4642#endif
4643 }
4644
4645 if (query == &brmctx->ip4_own_query)
4646 br_multicast_enable(ip4_own_query);
4647#if IS_ENABLED(CONFIG_IPV6)
4648 else
4649 br_multicast_enable(ip6_own_query);
4650#endif
4651 }
4652 rcu_read_unlock();
4653}
4654
4655int br_multicast_toggle(struct net_bridge *br, unsigned long val,
4656 struct netlink_ext_ack *extack)
4657{
4658 struct net_bridge_port *port;
4659 bool change_snoopers = false;
4660 int err = 0;
4661
4662 spin_lock_bh(&br->multicast_lock);
4663 if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val)
4664 goto unlock;
4665
4666 err = br_mc_disabled_update(br->dev, val, extack);
4667 if (err == -EOPNOTSUPP)
4668 err = 0;
4669 if (err)
4670 goto unlock;
4671
4672 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val);
4673 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) {
4674 change_snoopers = true;
4675 goto unlock;
4676 }
4677
4678 if (!netif_running(br->dev))
4679 goto unlock;
4680
4681 br_multicast_open(br);
4682 list_for_each_entry(port, &br->port_list, list)
4683 __br_multicast_enable_port_ctx(&port->multicast_ctx);
4684
4685 change_snoopers = true;
4686
4687unlock:
4688 spin_unlock_bh(&br->multicast_lock);
4689
4690 /* br_multicast_join_snoopers has the potential to cause
4691 * an MLD Report/Leave to be delivered to br_multicast_rcv,
4692 * which would in turn call br_multicast_add_group, which would
4693 * attempt to acquire multicast_lock. This function should be
4694 * called after the lock has been released to avoid deadlocks on
4695 * multicast_lock.
4696 *
4697 * br_multicast_leave_snoopers does not have the problem since
4698 * br_multicast_rcv first checks BROPT_MULTICAST_ENABLED, and
4699 * returns without calling br_multicast_ipv4/6_rcv if it's not
4700 * enabled. Moved both functions out just for symmetry.
4701 */
4702 if (change_snoopers) {
4703 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
4704 br_multicast_join_snoopers(br);
4705 else
4706 br_multicast_leave_snoopers(br);
4707 }
4708
4709 return err;
4710}
4711
4712bool br_multicast_enabled(const struct net_device *dev)
4713{
4714 struct net_bridge *br = netdev_priv(dev);
4715
4716 return !!br_opt_get(br, BROPT_MULTICAST_ENABLED);
4717}
4718EXPORT_SYMBOL_GPL(br_multicast_enabled);
4719
4720bool br_multicast_router(const struct net_device *dev)
4721{
4722 struct net_bridge *br = netdev_priv(dev);
4723 bool is_router;
4724
4725 spin_lock_bh(&br->multicast_lock);
4726 is_router = br_multicast_is_router(&br->multicast_ctx, NULL);
4727 spin_unlock_bh(&br->multicast_lock);
4728 return is_router;
4729}
4730EXPORT_SYMBOL_GPL(br_multicast_router);
4731
4732int br_multicast_set_querier(struct net_bridge_mcast *brmctx, unsigned long val)
4733{
4734 unsigned long max_delay;
4735
4736 val = !!val;
4737
4738 spin_lock_bh(&brmctx->br->multicast_lock);
4739 if (brmctx->multicast_querier == val)
4740 goto unlock;
4741
4742 WRITE_ONCE(brmctx->multicast_querier, val);
4743 if (!val)
4744 goto unlock;
4745
4746 max_delay = brmctx->multicast_query_response_interval;
4747
4748 if (!timer_pending(&brmctx->ip4_other_query.timer))
4749 mod_timer(&brmctx->ip4_other_query.delay_timer,
4750 jiffies + max_delay);
4751
4752 br_multicast_start_querier(brmctx, &brmctx->ip4_own_query);
4753
4754#if IS_ENABLED(CONFIG_IPV6)
4755 if (!timer_pending(&brmctx->ip6_other_query.timer))
4756 mod_timer(&brmctx->ip6_other_query.delay_timer,
4757 jiffies + max_delay);
4758
4759 br_multicast_start_querier(brmctx, &brmctx->ip6_own_query);
4760#endif
4761
4762unlock:
4763 spin_unlock_bh(&brmctx->br->multicast_lock);
4764
4765 return 0;
4766}
4767
4768int br_multicast_set_igmp_version(struct net_bridge_mcast *brmctx,
4769 unsigned long val)
4770{
4771 /* Currently we support only version 2 and 3 */
4772 switch (val) {
4773 case 2:
4774 case 3:
4775 break;
4776 default:
4777 return -EINVAL;
4778 }
4779
4780 spin_lock_bh(&brmctx->br->multicast_lock);
4781 brmctx->multicast_igmp_version = val;
4782 spin_unlock_bh(&brmctx->br->multicast_lock);
4783
4784 return 0;
4785}
4786
4787#if IS_ENABLED(CONFIG_IPV6)
4788int br_multicast_set_mld_version(struct net_bridge_mcast *brmctx,
4789 unsigned long val)
4790{
4791 /* Currently we support version 1 and 2 */
4792 switch (val) {
4793 case 1:
4794 case 2:
4795 break;
4796 default:
4797 return -EINVAL;
4798 }
4799
4800 spin_lock_bh(&brmctx->br->multicast_lock);
4801 brmctx->multicast_mld_version = val;
4802 spin_unlock_bh(&brmctx->br->multicast_lock);
4803
4804 return 0;
4805}
4806#endif
4807
4808void br_multicast_set_query_intvl(struct net_bridge_mcast *brmctx,
4809 unsigned long val)
4810{
4811 unsigned long intvl_jiffies = clock_t_to_jiffies(val);
4812
4813 if (intvl_jiffies < BR_MULTICAST_QUERY_INTVL_MIN) {
4814 br_info(brmctx->br,
4815 "trying to set multicast query interval below minimum, setting to %lu (%ums)\n",
4816 jiffies_to_clock_t(BR_MULTICAST_QUERY_INTVL_MIN),
4817 jiffies_to_msecs(BR_MULTICAST_QUERY_INTVL_MIN));
4818 intvl_jiffies = BR_MULTICAST_QUERY_INTVL_MIN;
4819 }
4820
4821 brmctx->multicast_query_interval = intvl_jiffies;
4822}
4823
4824void br_multicast_set_startup_query_intvl(struct net_bridge_mcast *brmctx,
4825 unsigned long val)
4826{
4827 unsigned long intvl_jiffies = clock_t_to_jiffies(val);
4828
4829 if (intvl_jiffies < BR_MULTICAST_STARTUP_QUERY_INTVL_MIN) {
4830 br_info(brmctx->br,
4831 "trying to set multicast startup query interval below minimum, setting to %lu (%ums)\n",
4832 jiffies_to_clock_t(BR_MULTICAST_STARTUP_QUERY_INTVL_MIN),
4833 jiffies_to_msecs(BR_MULTICAST_STARTUP_QUERY_INTVL_MIN));
4834 intvl_jiffies = BR_MULTICAST_STARTUP_QUERY_INTVL_MIN;
4835 }
4836
4837 brmctx->multicast_startup_query_interval = intvl_jiffies;
4838}
4839
4840/**
4841 * br_multicast_list_adjacent - Returns snooped multicast addresses
4842 * @dev: The bridge port adjacent to which to retrieve addresses
4843 * @br_ip_list: The list to store found, snooped multicast IP addresses in
4844 *
4845 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
4846 * snooping feature on all bridge ports of dev's bridge device, excluding
4847 * the addresses from dev itself.
4848 *
4849 * Returns the number of items added to br_ip_list.
4850 *
4851 * Notes:
4852 * - br_ip_list needs to be initialized by caller
4853 * - br_ip_list might contain duplicates in the end
4854 * (needs to be taken care of by caller)
4855 * - br_ip_list needs to be freed by caller
4856 */
4857int br_multicast_list_adjacent(struct net_device *dev,
4858 struct list_head *br_ip_list)
4859{
4860 struct net_bridge *br;
4861 struct net_bridge_port *port;
4862 struct net_bridge_port_group *group;
4863 struct br_ip_list *entry;
4864 int count = 0;
4865
4866 rcu_read_lock();
4867 if (!br_ip_list || !netif_is_bridge_port(dev))
4868 goto unlock;
4869
4870 port = br_port_get_rcu(dev);
4871 if (!port || !port->br)
4872 goto unlock;
4873
4874 br = port->br;
4875
4876 list_for_each_entry_rcu(port, &br->port_list, list) {
4877 if (!port->dev || port->dev == dev)
4878 continue;
4879
4880 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
4881 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
4882 if (!entry)
4883 goto unlock;
4884
4885 entry->addr = group->key.addr;
4886 list_add(&entry->list, br_ip_list);
4887 count++;
4888 }
4889 }
4890
4891unlock:
4892 rcu_read_unlock();
4893 return count;
4894}
4895EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
4896
4897/**
4898 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
4899 * @dev: The bridge port providing the bridge on which to check for a querier
4900 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
4901 *
4902 * Checks whether the given interface has a bridge on top and if so returns
4903 * true if a valid querier exists anywhere on the bridged link layer.
4904 * Otherwise returns false.
4905 */
4906bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
4907{
4908 struct net_bridge *br;
4909 struct net_bridge_port *port;
4910 struct ethhdr eth;
4911 bool ret = false;
4912
4913 rcu_read_lock();
4914 if (!netif_is_bridge_port(dev))
4915 goto unlock;
4916
4917 port = br_port_get_rcu(dev);
4918 if (!port || !port->br)
4919 goto unlock;
4920
4921 br = port->br;
4922
4923 memset(&eth, 0, sizeof(eth));
4924 eth.h_proto = htons(proto);
4925
4926 ret = br_multicast_querier_exists(&br->multicast_ctx, &eth, NULL);
4927
4928unlock:
4929 rcu_read_unlock();
4930 return ret;
4931}
4932EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
4933
4934/**
4935 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
4936 * @dev: The bridge port adjacent to which to check for a querier
4937 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
4938 *
4939 * Checks whether the given interface has a bridge on top and if so returns
4940 * true if a selected querier is behind one of the other ports of this
4941 * bridge. Otherwise returns false.
4942 */
4943bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
4944{
4945 struct net_bridge_mcast *brmctx;
4946 struct net_bridge *br;
4947 struct net_bridge_port *port;
4948 bool ret = false;
4949 int port_ifidx;
4950
4951 rcu_read_lock();
4952 if (!netif_is_bridge_port(dev))
4953 goto unlock;
4954
4955 port = br_port_get_rcu(dev);
4956 if (!port || !port->br)
4957 goto unlock;
4958
4959 br = port->br;
4960 brmctx = &br->multicast_ctx;
4961
4962 switch (proto) {
4963 case ETH_P_IP:
4964 port_ifidx = brmctx->ip4_querier.port_ifidx;
4965 if (!timer_pending(&brmctx->ip4_other_query.timer) ||
4966 port_ifidx == port->dev->ifindex)
4967 goto unlock;
4968 break;
4969#if IS_ENABLED(CONFIG_IPV6)
4970 case ETH_P_IPV6:
4971 port_ifidx = brmctx->ip6_querier.port_ifidx;
4972 if (!timer_pending(&brmctx->ip6_other_query.timer) ||
4973 port_ifidx == port->dev->ifindex)
4974 goto unlock;
4975 break;
4976#endif
4977 default:
4978 goto unlock;
4979 }
4980
4981 ret = true;
4982unlock:
4983 rcu_read_unlock();
4984 return ret;
4985}
4986EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
4987
4988/**
4989 * br_multicast_has_router_adjacent - Checks for a router behind a bridge port
4990 * @dev: The bridge port adjacent to which to check for a multicast router
4991 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
4992 *
4993 * Checks whether the given interface has a bridge on top and if so returns
4994 * true if a multicast router is behind one of the other ports of this
4995 * bridge. Otherwise returns false.
4996 */
4997bool br_multicast_has_router_adjacent(struct net_device *dev, int proto)
4998{
4999 struct net_bridge_mcast_port *pmctx;
5000 struct net_bridge_mcast *brmctx;
5001 struct net_bridge_port *port;
5002 bool ret = false;
5003
5004 rcu_read_lock();
5005 port = br_port_get_check_rcu(dev);
5006 if (!port)
5007 goto unlock;
5008
5009 brmctx = &port->br->multicast_ctx;
5010 switch (proto) {
5011 case ETH_P_IP:
5012 hlist_for_each_entry_rcu(pmctx, &brmctx->ip4_mc_router_list,
5013 ip4_rlist) {
5014 if (pmctx->port == port)
5015 continue;
5016
5017 ret = true;
5018 goto unlock;
5019 }
5020 break;
5021#if IS_ENABLED(CONFIG_IPV6)
5022 case ETH_P_IPV6:
5023 hlist_for_each_entry_rcu(pmctx, &brmctx->ip6_mc_router_list,
5024 ip6_rlist) {
5025 if (pmctx->port == port)
5026 continue;
5027
5028 ret = true;
5029 goto unlock;
5030 }
5031 break;
5032#endif
5033 default:
5034 /* when compiled without IPv6 support, be conservative and
5035 * always assume presence of an IPv6 multicast router
5036 */
5037 ret = true;
5038 }
5039
5040unlock:
5041 rcu_read_unlock();
5042 return ret;
5043}
5044EXPORT_SYMBOL_GPL(br_multicast_has_router_adjacent);
5045
5046static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
5047 const struct sk_buff *skb, u8 type, u8 dir)
5048{
5049 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
5050 __be16 proto = skb->protocol;
5051 unsigned int t_len;
5052
5053 u64_stats_update_begin(&pstats->syncp);
5054 switch (proto) {
5055 case htons(ETH_P_IP):
5056 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
5057 switch (type) {
5058 case IGMP_HOST_MEMBERSHIP_REPORT:
5059 pstats->mstats.igmp_v1reports[dir]++;
5060 break;
5061 case IGMPV2_HOST_MEMBERSHIP_REPORT:
5062 pstats->mstats.igmp_v2reports[dir]++;
5063 break;
5064 case IGMPV3_HOST_MEMBERSHIP_REPORT:
5065 pstats->mstats.igmp_v3reports[dir]++;
5066 break;
5067 case IGMP_HOST_MEMBERSHIP_QUERY:
5068 if (t_len != sizeof(struct igmphdr)) {
5069 pstats->mstats.igmp_v3queries[dir]++;
5070 } else {
5071 unsigned int offset = skb_transport_offset(skb);
5072 struct igmphdr *ih, _ihdr;
5073
5074 ih = skb_header_pointer(skb, offset,
5075 sizeof(_ihdr), &_ihdr);
5076 if (!ih)
5077 break;
5078 if (!ih->code)
5079 pstats->mstats.igmp_v1queries[dir]++;
5080 else
5081 pstats->mstats.igmp_v2queries[dir]++;
5082 }
5083 break;
5084 case IGMP_HOST_LEAVE_MESSAGE:
5085 pstats->mstats.igmp_leaves[dir]++;
5086 break;
5087 }
5088 break;
5089#if IS_ENABLED(CONFIG_IPV6)
5090 case htons(ETH_P_IPV6):
5091 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
5092 sizeof(struct ipv6hdr);
5093 t_len -= skb_network_header_len(skb);
5094 switch (type) {
5095 case ICMPV6_MGM_REPORT:
5096 pstats->mstats.mld_v1reports[dir]++;
5097 break;
5098 case ICMPV6_MLD2_REPORT:
5099 pstats->mstats.mld_v2reports[dir]++;
5100 break;
5101 case ICMPV6_MGM_QUERY:
5102 if (t_len != sizeof(struct mld_msg))
5103 pstats->mstats.mld_v2queries[dir]++;
5104 else
5105 pstats->mstats.mld_v1queries[dir]++;
5106 break;
5107 case ICMPV6_MGM_REDUCTION:
5108 pstats->mstats.mld_leaves[dir]++;
5109 break;
5110 }
5111 break;
5112#endif /* CONFIG_IPV6 */
5113 }
5114 u64_stats_update_end(&pstats->syncp);
5115}
5116
5117void br_multicast_count(struct net_bridge *br,
5118 const struct net_bridge_port *p,
5119 const struct sk_buff *skb, u8 type, u8 dir)
5120{
5121 struct bridge_mcast_stats __percpu *stats;
5122
5123 /* if multicast_disabled is true then igmp type can't be set */
5124 if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
5125 return;
5126
5127 if (p)
5128 stats = p->mcast_stats;
5129 else
5130 stats = br->mcast_stats;
5131 if (WARN_ON(!stats))
5132 return;
5133
5134 br_mcast_stats_add(stats, skb, type, dir);
5135}
5136
5137int br_multicast_init_stats(struct net_bridge *br)
5138{
5139 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
5140 if (!br->mcast_stats)
5141 return -ENOMEM;
5142
5143 return 0;
5144}
5145
5146void br_multicast_uninit_stats(struct net_bridge *br)
5147{
5148 free_percpu(br->mcast_stats);
5149}
5150
5151/* noinline for https://llvm.org/pr45802#c9 */
5152static noinline_for_stack void mcast_stats_add_dir(u64 *dst, u64 *src)
5153{
5154 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
5155 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
5156}
5157
5158void br_multicast_get_stats(const struct net_bridge *br,
5159 const struct net_bridge_port *p,
5160 struct br_mcast_stats *dest)
5161{
5162 struct bridge_mcast_stats __percpu *stats;
5163 struct br_mcast_stats tdst;
5164 int i;
5165
5166 memset(dest, 0, sizeof(*dest));
5167 if (p)
5168 stats = p->mcast_stats;
5169 else
5170 stats = br->mcast_stats;
5171 if (WARN_ON(!stats))
5172 return;
5173
5174 memset(&tdst, 0, sizeof(tdst));
5175 for_each_possible_cpu(i) {
5176 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
5177 struct br_mcast_stats temp;
5178 unsigned int start;
5179
5180 do {
5181 start = u64_stats_fetch_begin(&cpu_stats->syncp);
5182 memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
5183 } while (u64_stats_fetch_retry(&cpu_stats->syncp, start));
5184
5185 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
5186 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
5187 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
5188 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
5189 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
5190 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
5191 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
5192 tdst.igmp_parse_errors += temp.igmp_parse_errors;
5193
5194 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
5195 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
5196 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
5197 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
5198 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
5199 tdst.mld_parse_errors += temp.mld_parse_errors;
5200 }
5201 memcpy(dest, &tdst, sizeof(*dest));
5202}
5203
5204int br_mdb_hash_init(struct net_bridge *br)
5205{
5206 int err;
5207
5208 err = rhashtable_init(&br->sg_port_tbl, &br_sg_port_rht_params);
5209 if (err)
5210 return err;
5211
5212 err = rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params);
5213 if (err) {
5214 rhashtable_destroy(&br->sg_port_tbl);
5215 return err;
5216 }
5217
5218 return 0;
5219}
5220
5221void br_mdb_hash_fini(struct net_bridge *br)
5222{
5223 rhashtable_destroy(&br->sg_port_tbl);
5224 rhashtable_destroy(&br->mdb_hash_tbl);
5225}
Linux 6.x block layer and io_uring tree(s)