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8#include <linux/err.h>
9#include <linux/export.h>
10#include <linux/if_ether.h>
11#include <linux/igmp.h>
12#include <linux/in.h>
13#include <linux/jhash.h>
14#include <linux/kernel.h>
15#include <linux/log2.h>
16#include <linux/netdevice.h>
17#include <linux/netfilter_bridge.h>
18#include <linux/random.h>
19#include <linux/rculist.h>
20#include <linux/skbuff.h>
21#include <linux/slab.h>
22#include <linux/timer.h>
23#include <linux/inetdevice.h>
24#include <linux/mroute.h>
25#include <net/ip.h>
26#include <net/switchdev.h>
27#if IS_ENABLED(CONFIG_IPV6)
28#include <linux/icmpv6.h>
29#include <net/ipv6.h>
30#include <net/mld.h>
31#include <net/ip6_checksum.h>
32#include <net/addrconf.h>
33#endif
34
35#include "br_private.h"
36
37static const struct rhashtable_params br_mdb_rht_params = {
38 .head_offset = offsetof(struct net_bridge_mdb_entry, rhnode),
39 .key_offset = offsetof(struct net_bridge_mdb_entry, addr),
40 .key_len = sizeof(struct br_ip),
41 .automatic_shrinking = true,
42};
43
44static void br_multicast_start_querier(struct net_bridge *br,
45 struct bridge_mcast_own_query *query);
46static void br_multicast_add_router(struct net_bridge *br,
47 struct net_bridge_port *port);
48static void br_ip4_multicast_leave_group(struct net_bridge *br,
49 struct net_bridge_port *port,
50 __be32 group,
51 __u16 vid,
52 const unsigned char *src);
53
54static void __del_port_router(struct net_bridge_port *p);
55#if IS_ENABLED(CONFIG_IPV6)
56static void br_ip6_multicast_leave_group(struct net_bridge *br,
57 struct net_bridge_port *port,
58 const struct in6_addr *group,
59 __u16 vid, const unsigned char *src);
60#endif
61
62static struct net_bridge_mdb_entry *br_mdb_ip_get_rcu(struct net_bridge *br,
63 struct br_ip *dst)
64{
65 return rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
66}
67
68struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge *br,
69 struct br_ip *dst)
70{
71 struct net_bridge_mdb_entry *ent;
72
73 lockdep_assert_held_once(&br->multicast_lock);
74
75 rcu_read_lock();
76 ent = rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
77 rcu_read_unlock();
78
79 return ent;
80}
81
82static struct net_bridge_mdb_entry *br_mdb_ip4_get(struct net_bridge *br,
83 __be32 dst, __u16 vid)
84{
85 struct br_ip br_dst;
86
87 memset(&br_dst, 0, sizeof(br_dst));
88 br_dst.u.ip4 = dst;
89 br_dst.proto = htons(ETH_P_IP);
90 br_dst.vid = vid;
91
92 return br_mdb_ip_get(br, &br_dst);
93}
94
95#if IS_ENABLED(CONFIG_IPV6)
96static struct net_bridge_mdb_entry *br_mdb_ip6_get(struct net_bridge *br,
97 const struct in6_addr *dst,
98 __u16 vid)
99{
100 struct br_ip br_dst;
101
102 memset(&br_dst, 0, sizeof(br_dst));
103 br_dst.u.ip6 = *dst;
104 br_dst.proto = htons(ETH_P_IPV6);
105 br_dst.vid = vid;
106
107 return br_mdb_ip_get(br, &br_dst);
108}
109#endif
110
111struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
112 struct sk_buff *skb, u16 vid)
113{
114 struct br_ip ip;
115
116 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
117 return NULL;
118
119 if (BR_INPUT_SKB_CB(skb)->igmp)
120 return NULL;
121
122 memset(&ip, 0, sizeof(ip));
123 ip.proto = skb->protocol;
124 ip.vid = vid;
125
126 switch (skb->protocol) {
127 case htons(ETH_P_IP):
128 ip.u.ip4 = ip_hdr(skb)->daddr;
129 break;
130#if IS_ENABLED(CONFIG_IPV6)
131 case htons(ETH_P_IPV6):
132 ip.u.ip6 = ipv6_hdr(skb)->daddr;
133 break;
134#endif
135 default:
136 return NULL;
137 }
138
139 return br_mdb_ip_get_rcu(br, &ip);
140}
141
142static void br_multicast_group_expired(struct timer_list *t)
143{
144 struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer);
145 struct net_bridge *br = mp->br;
146
147 spin_lock(&br->multicast_lock);
148 if (!netif_running(br->dev) || timer_pending(&mp->timer))
149 goto out;
150
151 mp->host_joined = false;
152 br_mdb_notify(br->dev, NULL, &mp->addr, RTM_DELMDB, 0);
153
154 if (mp->ports)
155 goto out;
156
157 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
158 br_mdb_rht_params);
159 hlist_del_rcu(&mp->mdb_node);
160
161 kfree_rcu(mp, rcu);
162
163out:
164 spin_unlock(&br->multicast_lock);
165}
166
167static void br_multicast_del_pg(struct net_bridge *br,
168 struct net_bridge_port_group *pg)
169{
170 struct net_bridge_mdb_entry *mp;
171 struct net_bridge_port_group *p;
172 struct net_bridge_port_group __rcu **pp;
173
174 mp = br_mdb_ip_get(br, &pg->addr);
175 if (WARN_ON(!mp))
176 return;
177
178 for (pp = &mp->ports;
179 (p = mlock_dereference(*pp, br)) != NULL;
180 pp = &p->next) {
181 if (p != pg)
182 continue;
183
184 rcu_assign_pointer(*pp, p->next);
185 hlist_del_init(&p->mglist);
186 del_timer(&p->timer);
187 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
188 p->flags);
189 kfree_rcu(p, rcu);
190
191 if (!mp->ports && !mp->host_joined &&
192 netif_running(br->dev))
193 mod_timer(&mp->timer, jiffies);
194
195 return;
196 }
197
198 WARN_ON(1);
199}
200
201static void br_multicast_port_group_expired(struct timer_list *t)
202{
203 struct net_bridge_port_group *pg = from_timer(pg, t, timer);
204 struct net_bridge *br = pg->port->br;
205
206 spin_lock(&br->multicast_lock);
207 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
208 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
209 goto out;
210
211 br_multicast_del_pg(br, pg);
212
213out:
214 spin_unlock(&br->multicast_lock);
215}
216
217static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
218 __be32 group,
219 u8 *igmp_type)
220{
221 struct igmpv3_query *ihv3;
222 size_t igmp_hdr_size;
223 struct sk_buff *skb;
224 struct igmphdr *ih;
225 struct ethhdr *eth;
226 struct iphdr *iph;
227
228 igmp_hdr_size = sizeof(*ih);
229 if (br->multicast_igmp_version == 3)
230 igmp_hdr_size = sizeof(*ihv3);
231 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
232 igmp_hdr_size + 4);
233 if (!skb)
234 goto out;
235
236 skb->protocol = htons(ETH_P_IP);
237
238 skb_reset_mac_header(skb);
239 eth = eth_hdr(skb);
240
241 ether_addr_copy(eth->h_source, br->dev->dev_addr);
242 eth->h_dest[0] = 1;
243 eth->h_dest[1] = 0;
244 eth->h_dest[2] = 0x5e;
245 eth->h_dest[3] = 0;
246 eth->h_dest[4] = 0;
247 eth->h_dest[5] = 1;
248 eth->h_proto = htons(ETH_P_IP);
249 skb_put(skb, sizeof(*eth));
250
251 skb_set_network_header(skb, skb->len);
252 iph = ip_hdr(skb);
253
254 iph->version = 4;
255 iph->ihl = 6;
256 iph->tos = 0xc0;
257 iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4);
258 iph->id = 0;
259 iph->frag_off = htons(IP_DF);
260 iph->ttl = 1;
261 iph->protocol = IPPROTO_IGMP;
262 iph->saddr = br_opt_get(br, BROPT_MULTICAST_QUERY_USE_IFADDR) ?
263 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
264 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
265 ((u8 *)&iph[1])[0] = IPOPT_RA;
266 ((u8 *)&iph[1])[1] = 4;
267 ((u8 *)&iph[1])[2] = 0;
268 ((u8 *)&iph[1])[3] = 0;
269 ip_send_check(iph);
270 skb_put(skb, 24);
271
272 skb_set_transport_header(skb, skb->len);
273 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
274
275 switch (br->multicast_igmp_version) {
276 case 2:
277 ih = igmp_hdr(skb);
278 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
279 ih->code = (group ? br->multicast_last_member_interval :
280 br->multicast_query_response_interval) /
281 (HZ / IGMP_TIMER_SCALE);
282 ih->group = group;
283 ih->csum = 0;
284 ih->csum = ip_compute_csum((void *)ih, sizeof(*ih));
285 break;
286 case 3:
287 ihv3 = igmpv3_query_hdr(skb);
288 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
289 ihv3->code = (group ? br->multicast_last_member_interval :
290 br->multicast_query_response_interval) /
291 (HZ / IGMP_TIMER_SCALE);
292 ihv3->group = group;
293 ihv3->qqic = br->multicast_query_interval / HZ;
294 ihv3->nsrcs = 0;
295 ihv3->resv = 0;
296 ihv3->suppress = 0;
297 ihv3->qrv = 2;
298 ihv3->csum = 0;
299 ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3));
300 break;
301 }
302
303 skb_put(skb, igmp_hdr_size);
304 __skb_pull(skb, sizeof(*eth));
305
306out:
307 return skb;
308}
309
310#if IS_ENABLED(CONFIG_IPV6)
311static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
312 const struct in6_addr *grp,
313 u8 *igmp_type)
314{
315 struct mld2_query *mld2q;
316 unsigned long interval;
317 struct ipv6hdr *ip6h;
318 struct mld_msg *mldq;
319 size_t mld_hdr_size;
320 struct sk_buff *skb;
321 struct ethhdr *eth;
322 u8 *hopopt;
323
324 mld_hdr_size = sizeof(*mldq);
325 if (br->multicast_mld_version == 2)
326 mld_hdr_size = sizeof(*mld2q);
327 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
328 8 + mld_hdr_size);
329 if (!skb)
330 goto out;
331
332 skb->protocol = htons(ETH_P_IPV6);
333
334
335 skb_reset_mac_header(skb);
336 eth = eth_hdr(skb);
337
338 ether_addr_copy(eth->h_source, br->dev->dev_addr);
339 eth->h_proto = htons(ETH_P_IPV6);
340 skb_put(skb, sizeof(*eth));
341
342
343 skb_set_network_header(skb, skb->len);
344 ip6h = ipv6_hdr(skb);
345
346 *(__force __be32 *)ip6h = htonl(0x60000000);
347 ip6h->payload_len = htons(8 + mld_hdr_size);
348 ip6h->nexthdr = IPPROTO_HOPOPTS;
349 ip6h->hop_limit = 1;
350 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
351 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
352 &ip6h->saddr)) {
353 kfree_skb(skb);
354 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, false);
355 return NULL;
356 }
357
358 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
359 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
360
361 hopopt = (u8 *)(ip6h + 1);
362 hopopt[0] = IPPROTO_ICMPV6;
363 hopopt[1] = 0;
364 hopopt[2] = IPV6_TLV_ROUTERALERT;
365 hopopt[3] = 2;
366 hopopt[4] = 0;
367 hopopt[5] = 0;
368 hopopt[6] = IPV6_TLV_PAD1;
369 hopopt[7] = IPV6_TLV_PAD1;
370
371 skb_put(skb, sizeof(*ip6h) + 8);
372
373
374 skb_set_transport_header(skb, skb->len);
375 interval = ipv6_addr_any(grp) ?
376 br->multicast_query_response_interval :
377 br->multicast_last_member_interval;
378 *igmp_type = ICMPV6_MGM_QUERY;
379 switch (br->multicast_mld_version) {
380 case 1:
381 mldq = (struct mld_msg *)icmp6_hdr(skb);
382 mldq->mld_type = ICMPV6_MGM_QUERY;
383 mldq->mld_code = 0;
384 mldq->mld_cksum = 0;
385 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
386 mldq->mld_reserved = 0;
387 mldq->mld_mca = *grp;
388 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
389 sizeof(*mldq), IPPROTO_ICMPV6,
390 csum_partial(mldq,
391 sizeof(*mldq),
392 0));
393 break;
394 case 2:
395 mld2q = (struct mld2_query *)icmp6_hdr(skb);
396 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
397 mld2q->mld2q_type = ICMPV6_MGM_QUERY;
398 mld2q->mld2q_code = 0;
399 mld2q->mld2q_cksum = 0;
400 mld2q->mld2q_resv1 = 0;
401 mld2q->mld2q_resv2 = 0;
402 mld2q->mld2q_suppress = 0;
403 mld2q->mld2q_qrv = 2;
404 mld2q->mld2q_nsrcs = 0;
405 mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
406 mld2q->mld2q_mca = *grp;
407 mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
408 sizeof(*mld2q),
409 IPPROTO_ICMPV6,
410 csum_partial(mld2q,
411 sizeof(*mld2q),
412 0));
413 break;
414 }
415 skb_put(skb, mld_hdr_size);
416
417 __skb_pull(skb, sizeof(*eth));
418
419out:
420 return skb;
421}
422#endif
423
424static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
425 struct br_ip *addr,
426 u8 *igmp_type)
427{
428 switch (addr->proto) {
429 case htons(ETH_P_IP):
430 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
431#if IS_ENABLED(CONFIG_IPV6)
432 case htons(ETH_P_IPV6):
433 return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
434 igmp_type);
435#endif
436 }
437 return NULL;
438}
439
440struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
441 struct br_ip *group)
442{
443 struct net_bridge_mdb_entry *mp;
444 int err;
445
446 mp = br_mdb_ip_get(br, group);
447 if (mp)
448 return mp;
449
450 if (atomic_read(&br->mdb_hash_tbl.nelems) >= br->hash_max) {
451 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false);
452 return ERR_PTR(-E2BIG);
453 }
454
455 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
456 if (unlikely(!mp))
457 return ERR_PTR(-ENOMEM);
458
459 mp->br = br;
460 mp->addr = *group;
461 timer_setup(&mp->timer, br_multicast_group_expired, 0);
462 err = rhashtable_lookup_insert_fast(&br->mdb_hash_tbl, &mp->rhnode,
463 br_mdb_rht_params);
464 if (err) {
465 kfree(mp);
466 mp = ERR_PTR(err);
467 } else {
468 hlist_add_head_rcu(&mp->mdb_node, &br->mdb_list);
469 }
470
471 return mp;
472}
473
474struct net_bridge_port_group *br_multicast_new_port_group(
475 struct net_bridge_port *port,
476 struct br_ip *group,
477 struct net_bridge_port_group __rcu *next,
478 unsigned char flags,
479 const unsigned char *src)
480{
481 struct net_bridge_port_group *p;
482
483 p = kzalloc(sizeof(*p), GFP_ATOMIC);
484 if (unlikely(!p))
485 return NULL;
486
487 p->addr = *group;
488 p->port = port;
489 p->flags = flags;
490 rcu_assign_pointer(p->next, next);
491 hlist_add_head(&p->mglist, &port->mglist);
492 timer_setup(&p->timer, br_multicast_port_group_expired, 0);
493
494 if (src)
495 memcpy(p->eth_addr, src, ETH_ALEN);
496 else
497 eth_broadcast_addr(p->eth_addr);
498
499 return p;
500}
501
502static bool br_port_group_equal(struct net_bridge_port_group *p,
503 struct net_bridge_port *port,
504 const unsigned char *src)
505{
506 if (p->port != port)
507 return false;
508
509 if (!(port->flags & BR_MULTICAST_TO_UNICAST))
510 return true;
511
512 return ether_addr_equal(src, p->eth_addr);
513}
514
515static int br_multicast_add_group(struct net_bridge *br,
516 struct net_bridge_port *port,
517 struct br_ip *group,
518 const unsigned char *src)
519{
520 struct net_bridge_port_group __rcu **pp;
521 struct net_bridge_port_group *p;
522 struct net_bridge_mdb_entry *mp;
523 unsigned long now = jiffies;
524 int err;
525
526 spin_lock(&br->multicast_lock);
527 if (!netif_running(br->dev) ||
528 (port && port->state == BR_STATE_DISABLED))
529 goto out;
530
531 mp = br_multicast_new_group(br, group);
532 err = PTR_ERR(mp);
533 if (IS_ERR(mp))
534 goto err;
535
536 if (!port) {
537 if (!mp->host_joined) {
538 mp->host_joined = true;
539 br_mdb_notify(br->dev, NULL, &mp->addr, RTM_NEWMDB, 0);
540 }
541 mod_timer(&mp->timer, now + br->multicast_membership_interval);
542 goto out;
543 }
544
545 for (pp = &mp->ports;
546 (p = mlock_dereference(*pp, br)) != NULL;
547 pp = &p->next) {
548 if (br_port_group_equal(p, port, src))
549 goto found;
550 if ((unsigned long)p->port < (unsigned long)port)
551 break;
552 }
553
554 p = br_multicast_new_port_group(port, group, *pp, 0, src);
555 if (unlikely(!p))
556 goto err;
557 rcu_assign_pointer(*pp, p);
558 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
559
560found:
561 mod_timer(&p->timer, now + br->multicast_membership_interval);
562out:
563 err = 0;
564
565err:
566 spin_unlock(&br->multicast_lock);
567 return err;
568}
569
570static int br_ip4_multicast_add_group(struct net_bridge *br,
571 struct net_bridge_port *port,
572 __be32 group,
573 __u16 vid,
574 const unsigned char *src)
575{
576 struct br_ip br_group;
577
578 if (ipv4_is_local_multicast(group))
579 return 0;
580
581 memset(&br_group, 0, sizeof(br_group));
582 br_group.u.ip4 = group;
583 br_group.proto = htons(ETH_P_IP);
584 br_group.vid = vid;
585
586 return br_multicast_add_group(br, port, &br_group, src);
587}
588
589#if IS_ENABLED(CONFIG_IPV6)
590static int br_ip6_multicast_add_group(struct net_bridge *br,
591 struct net_bridge_port *port,
592 const struct in6_addr *group,
593 __u16 vid,
594 const unsigned char *src)
595{
596 struct br_ip br_group;
597
598 if (ipv6_addr_is_ll_all_nodes(group))
599 return 0;
600
601 memset(&br_group, 0, sizeof(br_group));
602 br_group.u.ip6 = *group;
603 br_group.proto = htons(ETH_P_IPV6);
604 br_group.vid = vid;
605
606 return br_multicast_add_group(br, port, &br_group, src);
607}
608#endif
609
610static void br_multicast_router_expired(struct timer_list *t)
611{
612 struct net_bridge_port *port =
613 from_timer(port, t, multicast_router_timer);
614 struct net_bridge *br = port->br;
615
616 spin_lock(&br->multicast_lock);
617 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
618 port->multicast_router == MDB_RTR_TYPE_PERM ||
619 timer_pending(&port->multicast_router_timer))
620 goto out;
621
622 __del_port_router(port);
623out:
624 spin_unlock(&br->multicast_lock);
625}
626
627static void br_mc_router_state_change(struct net_bridge *p,
628 bool is_mc_router)
629{
630 struct switchdev_attr attr = {
631 .orig_dev = p->dev,
632 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
633 .flags = SWITCHDEV_F_DEFER,
634 .u.mrouter = is_mc_router,
635 };
636
637 switchdev_port_attr_set(p->dev, &attr);
638}
639
640static void br_multicast_local_router_expired(struct timer_list *t)
641{
642 struct net_bridge *br = from_timer(br, t, multicast_router_timer);
643
644 spin_lock(&br->multicast_lock);
645 if (br->multicast_router == MDB_RTR_TYPE_DISABLED ||
646 br->multicast_router == MDB_RTR_TYPE_PERM ||
647 timer_pending(&br->multicast_router_timer))
648 goto out;
649
650 br_mc_router_state_change(br, false);
651out:
652 spin_unlock(&br->multicast_lock);
653}
654
655static void br_multicast_querier_expired(struct net_bridge *br,
656 struct bridge_mcast_own_query *query)
657{
658 spin_lock(&br->multicast_lock);
659 if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
660 goto out;
661
662 br_multicast_start_querier(br, query);
663
664out:
665 spin_unlock(&br->multicast_lock);
666}
667
668static void br_ip4_multicast_querier_expired(struct timer_list *t)
669{
670 struct net_bridge *br = from_timer(br, t, ip4_other_query.timer);
671
672 br_multicast_querier_expired(br, &br->ip4_own_query);
673}
674
675#if IS_ENABLED(CONFIG_IPV6)
676static void br_ip6_multicast_querier_expired(struct timer_list *t)
677{
678 struct net_bridge *br = from_timer(br, t, ip6_other_query.timer);
679
680 br_multicast_querier_expired(br, &br->ip6_own_query);
681}
682#endif
683
684static void br_multicast_select_own_querier(struct net_bridge *br,
685 struct br_ip *ip,
686 struct sk_buff *skb)
687{
688 if (ip->proto == htons(ETH_P_IP))
689 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
690#if IS_ENABLED(CONFIG_IPV6)
691 else
692 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
693#endif
694}
695
696static void __br_multicast_send_query(struct net_bridge *br,
697 struct net_bridge_port *port,
698 struct br_ip *ip)
699{
700 struct sk_buff *skb;
701 u8 igmp_type;
702
703 skb = br_multicast_alloc_query(br, ip, &igmp_type);
704 if (!skb)
705 return;
706
707 if (port) {
708 skb->dev = port->dev;
709 br_multicast_count(br, port, skb, igmp_type,
710 BR_MCAST_DIR_TX);
711 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
712 dev_net(port->dev), NULL, skb, NULL, skb->dev,
713 br_dev_queue_push_xmit);
714 } else {
715 br_multicast_select_own_querier(br, ip, skb);
716 br_multicast_count(br, port, skb, igmp_type,
717 BR_MCAST_DIR_RX);
718 netif_rx(skb);
719 }
720}
721
722static void br_multicast_send_query(struct net_bridge *br,
723 struct net_bridge_port *port,
724 struct bridge_mcast_own_query *own_query)
725{
726 struct bridge_mcast_other_query *other_query = NULL;
727 struct br_ip br_group;
728 unsigned long time;
729
730 if (!netif_running(br->dev) ||
731 !br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
732 !br_opt_get(br, BROPT_MULTICAST_QUERIER))
733 return;
734
735 memset(&br_group.u, 0, sizeof(br_group.u));
736
737 if (port ? (own_query == &port->ip4_own_query) :
738 (own_query == &br->ip4_own_query)) {
739 other_query = &br->ip4_other_query;
740 br_group.proto = htons(ETH_P_IP);
741#if IS_ENABLED(CONFIG_IPV6)
742 } else {
743 other_query = &br->ip6_other_query;
744 br_group.proto = htons(ETH_P_IPV6);
745#endif
746 }
747
748 if (!other_query || timer_pending(&other_query->timer))
749 return;
750
751 __br_multicast_send_query(br, port, &br_group);
752
753 time = jiffies;
754 time += own_query->startup_sent < br->multicast_startup_query_count ?
755 br->multicast_startup_query_interval :
756 br->multicast_query_interval;
757 mod_timer(&own_query->timer, time);
758}
759
760static void
761br_multicast_port_query_expired(struct net_bridge_port *port,
762 struct bridge_mcast_own_query *query)
763{
764 struct net_bridge *br = port->br;
765
766 spin_lock(&br->multicast_lock);
767 if (port->state == BR_STATE_DISABLED ||
768 port->state == BR_STATE_BLOCKING)
769 goto out;
770
771 if (query->startup_sent < br->multicast_startup_query_count)
772 query->startup_sent++;
773
774 br_multicast_send_query(port->br, port, query);
775
776out:
777 spin_unlock(&br->multicast_lock);
778}
779
780static void br_ip4_multicast_port_query_expired(struct timer_list *t)
781{
782 struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer);
783
784 br_multicast_port_query_expired(port, &port->ip4_own_query);
785}
786
787#if IS_ENABLED(CONFIG_IPV6)
788static void br_ip6_multicast_port_query_expired(struct timer_list *t)
789{
790 struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer);
791
792 br_multicast_port_query_expired(port, &port->ip6_own_query);
793}
794#endif
795
796static void br_mc_disabled_update(struct net_device *dev, bool value)
797{
798 struct switchdev_attr attr = {
799 .orig_dev = dev,
800 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
801 .flags = SWITCHDEV_F_DEFER,
802 .u.mc_disabled = !value,
803 };
804
805 switchdev_port_attr_set(dev, &attr);
806}
807
808int br_multicast_add_port(struct net_bridge_port *port)
809{
810 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
811
812 timer_setup(&port->multicast_router_timer,
813 br_multicast_router_expired, 0);
814 timer_setup(&port->ip4_own_query.timer,
815 br_ip4_multicast_port_query_expired, 0);
816#if IS_ENABLED(CONFIG_IPV6)
817 timer_setup(&port->ip6_own_query.timer,
818 br_ip6_multicast_port_query_expired, 0);
819#endif
820 br_mc_disabled_update(port->dev,
821 br_opt_get(port->br, BROPT_MULTICAST_ENABLED));
822
823 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
824 if (!port->mcast_stats)
825 return -ENOMEM;
826
827 return 0;
828}
829
830void br_multicast_del_port(struct net_bridge_port *port)
831{
832 struct net_bridge *br = port->br;
833 struct net_bridge_port_group *pg;
834 struct hlist_node *n;
835
836
837 spin_lock_bh(&br->multicast_lock);
838 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
839 br_multicast_del_pg(br, pg);
840 spin_unlock_bh(&br->multicast_lock);
841 del_timer_sync(&port->multicast_router_timer);
842 free_percpu(port->mcast_stats);
843}
844
845static void br_multicast_enable(struct bridge_mcast_own_query *query)
846{
847 query->startup_sent = 0;
848
849 if (try_to_del_timer_sync(&query->timer) >= 0 ||
850 del_timer(&query->timer))
851 mod_timer(&query->timer, jiffies);
852}
853
854static void __br_multicast_enable_port(struct net_bridge_port *port)
855{
856 struct net_bridge *br = port->br;
857
858 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || !netif_running(br->dev))
859 return;
860
861 br_multicast_enable(&port->ip4_own_query);
862#if IS_ENABLED(CONFIG_IPV6)
863 br_multicast_enable(&port->ip6_own_query);
864#endif
865 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
866 hlist_unhashed(&port->rlist))
867 br_multicast_add_router(br, port);
868}
869
870void br_multicast_enable_port(struct net_bridge_port *port)
871{
872 struct net_bridge *br = port->br;
873
874 spin_lock(&br->multicast_lock);
875 __br_multicast_enable_port(port);
876 spin_unlock(&br->multicast_lock);
877}
878
879void br_multicast_disable_port(struct net_bridge_port *port)
880{
881 struct net_bridge *br = port->br;
882 struct net_bridge_port_group *pg;
883 struct hlist_node *n;
884
885 spin_lock(&br->multicast_lock);
886 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
887 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
888 br_multicast_del_pg(br, pg);
889
890 __del_port_router(port);
891
892 del_timer(&port->multicast_router_timer);
893 del_timer(&port->ip4_own_query.timer);
894#if IS_ENABLED(CONFIG_IPV6)
895 del_timer(&port->ip6_own_query.timer);
896#endif
897 spin_unlock(&br->multicast_lock);
898}
899
900static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
901 struct net_bridge_port *port,
902 struct sk_buff *skb,
903 u16 vid)
904{
905 const unsigned char *src;
906 struct igmpv3_report *ih;
907 struct igmpv3_grec *grec;
908 int i;
909 int len;
910 int num;
911 int type;
912 int err = 0;
913 __be32 group;
914 u16 nsrcs;
915
916 ih = igmpv3_report_hdr(skb);
917 num = ntohs(ih->ngrec);
918 len = skb_transport_offset(skb) + sizeof(*ih);
919
920 for (i = 0; i < num; i++) {
921 len += sizeof(*grec);
922 if (!ip_mc_may_pull(skb, len))
923 return -EINVAL;
924
925 grec = (void *)(skb->data + len - sizeof(*grec));
926 group = grec->grec_mca;
927 type = grec->grec_type;
928 nsrcs = ntohs(grec->grec_nsrcs);
929
930 len += nsrcs * 4;
931 if (!ip_mc_may_pull(skb, len))
932 return -EINVAL;
933
934
935 switch (type) {
936 case IGMPV3_MODE_IS_INCLUDE:
937 case IGMPV3_MODE_IS_EXCLUDE:
938 case IGMPV3_CHANGE_TO_INCLUDE:
939 case IGMPV3_CHANGE_TO_EXCLUDE:
940 case IGMPV3_ALLOW_NEW_SOURCES:
941 case IGMPV3_BLOCK_OLD_SOURCES:
942 break;
943
944 default:
945 continue;
946 }
947
948 src = eth_hdr(skb)->h_source;
949 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
950 type == IGMPV3_MODE_IS_INCLUDE) &&
951 nsrcs == 0) {
952 br_ip4_multicast_leave_group(br, port, group, vid, src);
953 } else {
954 err = br_ip4_multicast_add_group(br, port, group, vid,
955 src);
956 if (err)
957 break;
958 }
959 }
960
961 return err;
962}
963
964#if IS_ENABLED(CONFIG_IPV6)
965static int br_ip6_multicast_mld2_report(struct net_bridge *br,
966 struct net_bridge_port *port,
967 struct sk_buff *skb,
968 u16 vid)
969{
970 unsigned int nsrcs_offset;
971 const unsigned char *src;
972 struct icmp6hdr *icmp6h;
973 struct mld2_grec *grec;
974 unsigned int grec_len;
975 int i;
976 int len;
977 int num;
978 int err = 0;
979
980 if (!ipv6_mc_may_pull(skb, sizeof(*icmp6h)))
981 return -EINVAL;
982
983 icmp6h = icmp6_hdr(skb);
984 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
985 len = skb_transport_offset(skb) + sizeof(*icmp6h);
986
987 for (i = 0; i < num; i++) {
988 __be16 *_nsrcs, __nsrcs;
989 u16 nsrcs;
990
991 nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs);
992
993 if (skb_transport_offset(skb) + ipv6_transport_len(skb) <
994 nsrcs_offset + sizeof(_nsrcs))
995 return -EINVAL;
996
997 _nsrcs = skb_header_pointer(skb, nsrcs_offset,
998 sizeof(__nsrcs), &__nsrcs);
999 if (!_nsrcs)
1000 return -EINVAL;
1001
1002 nsrcs = ntohs(*_nsrcs);
1003 grec_len = struct_size(grec, grec_src, nsrcs);
1004
1005 if (!ipv6_mc_may_pull(skb, len + grec_len))
1006 return -EINVAL;
1007
1008 grec = (struct mld2_grec *)(skb->data + len);
1009 len += grec_len;
1010
1011
1012 switch (grec->grec_type) {
1013 case MLD2_MODE_IS_INCLUDE:
1014 case MLD2_MODE_IS_EXCLUDE:
1015 case MLD2_CHANGE_TO_INCLUDE:
1016 case MLD2_CHANGE_TO_EXCLUDE:
1017 case MLD2_ALLOW_NEW_SOURCES:
1018 case MLD2_BLOCK_OLD_SOURCES:
1019 break;
1020
1021 default:
1022 continue;
1023 }
1024
1025 src = eth_hdr(skb)->h_source;
1026 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1027 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1028 nsrcs == 0) {
1029 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1030 vid, src);
1031 } else {
1032 err = br_ip6_multicast_add_group(br, port,
1033 &grec->grec_mca, vid,
1034 src);
1035 if (err)
1036 break;
1037 }
1038 }
1039
1040 return err;
1041}
1042#endif
1043
1044static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1045 struct net_bridge_port *port,
1046 __be32 saddr)
1047{
1048 if (!timer_pending(&br->ip4_own_query.timer) &&
1049 !timer_pending(&br->ip4_other_query.timer))
1050 goto update;
1051
1052 if (!br->ip4_querier.addr.u.ip4)
1053 goto update;
1054
1055 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1056 goto update;
1057
1058 return false;
1059
1060update:
1061 br->ip4_querier.addr.u.ip4 = saddr;
1062
1063
1064 rcu_assign_pointer(br->ip4_querier.port, port);
1065
1066 return true;
1067}
1068
1069#if IS_ENABLED(CONFIG_IPV6)
1070static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1071 struct net_bridge_port *port,
1072 struct in6_addr *saddr)
1073{
1074 if (!timer_pending(&br->ip6_own_query.timer) &&
1075 !timer_pending(&br->ip6_other_query.timer))
1076 goto update;
1077
1078 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1079 goto update;
1080
1081 return false;
1082
1083update:
1084 br->ip6_querier.addr.u.ip6 = *saddr;
1085
1086
1087 rcu_assign_pointer(br->ip6_querier.port, port);
1088
1089 return true;
1090}
1091#endif
1092
1093static bool br_multicast_select_querier(struct net_bridge *br,
1094 struct net_bridge_port *port,
1095 struct br_ip *saddr)
1096{
1097 switch (saddr->proto) {
1098 case htons(ETH_P_IP):
1099 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1100#if IS_ENABLED(CONFIG_IPV6)
1101 case htons(ETH_P_IPV6):
1102 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1103#endif
1104 }
1105
1106 return false;
1107}
1108
1109static void
1110br_multicast_update_query_timer(struct net_bridge *br,
1111 struct bridge_mcast_other_query *query,
1112 unsigned long max_delay)
1113{
1114 if (!timer_pending(&query->timer))
1115 query->delay_time = jiffies + max_delay;
1116
1117 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1118}
1119
1120static void br_port_mc_router_state_change(struct net_bridge_port *p,
1121 bool is_mc_router)
1122{
1123 struct switchdev_attr attr = {
1124 .orig_dev = p->dev,
1125 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
1126 .flags = SWITCHDEV_F_DEFER,
1127 .u.mrouter = is_mc_router,
1128 };
1129
1130 switchdev_port_attr_set(p->dev, &attr);
1131}
1132
1133
1134
1135
1136
1137
1138static void br_multicast_add_router(struct net_bridge *br,
1139 struct net_bridge_port *port)
1140{
1141 struct net_bridge_port *p;
1142 struct hlist_node *slot = NULL;
1143
1144 if (!hlist_unhashed(&port->rlist))
1145 return;
1146
1147 hlist_for_each_entry(p, &br->router_list, rlist) {
1148 if ((unsigned long) port >= (unsigned long) p)
1149 break;
1150 slot = &p->rlist;
1151 }
1152
1153 if (slot)
1154 hlist_add_behind_rcu(&port->rlist, slot);
1155 else
1156 hlist_add_head_rcu(&port->rlist, &br->router_list);
1157 br_rtr_notify(br->dev, port, RTM_NEWMDB);
1158 br_port_mc_router_state_change(port, true);
1159}
1160
1161static void br_multicast_mark_router(struct net_bridge *br,
1162 struct net_bridge_port *port)
1163{
1164 unsigned long now = jiffies;
1165
1166 if (!port) {
1167 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
1168 if (!timer_pending(&br->multicast_router_timer))
1169 br_mc_router_state_change(br, true);
1170 mod_timer(&br->multicast_router_timer,
1171 now + br->multicast_querier_interval);
1172 }
1173 return;
1174 }
1175
1176 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1177 port->multicast_router == MDB_RTR_TYPE_PERM)
1178 return;
1179
1180 br_multicast_add_router(br, port);
1181
1182 mod_timer(&port->multicast_router_timer,
1183 now + br->multicast_querier_interval);
1184}
1185
1186static void br_multicast_query_received(struct net_bridge *br,
1187 struct net_bridge_port *port,
1188 struct bridge_mcast_other_query *query,
1189 struct br_ip *saddr,
1190 unsigned long max_delay)
1191{
1192 if (!br_multicast_select_querier(br, port, saddr))
1193 return;
1194
1195 br_multicast_update_query_timer(br, query, max_delay);
1196 br_multicast_mark_router(br, port);
1197}
1198
1199static void br_ip4_multicast_query(struct net_bridge *br,
1200 struct net_bridge_port *port,
1201 struct sk_buff *skb,
1202 u16 vid)
1203{
1204 unsigned int transport_len = ip_transport_len(skb);
1205 const struct iphdr *iph = ip_hdr(skb);
1206 struct igmphdr *ih = igmp_hdr(skb);
1207 struct net_bridge_mdb_entry *mp;
1208 struct igmpv3_query *ih3;
1209 struct net_bridge_port_group *p;
1210 struct net_bridge_port_group __rcu **pp;
1211 struct br_ip saddr;
1212 unsigned long max_delay;
1213 unsigned long now = jiffies;
1214 __be32 group;
1215
1216 spin_lock(&br->multicast_lock);
1217 if (!netif_running(br->dev) ||
1218 (port && port->state == BR_STATE_DISABLED))
1219 goto out;
1220
1221 group = ih->group;
1222
1223 if (transport_len == sizeof(*ih)) {
1224 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1225
1226 if (!max_delay) {
1227 max_delay = 10 * HZ;
1228 group = 0;
1229 }
1230 } else if (transport_len >= sizeof(*ih3)) {
1231 ih3 = igmpv3_query_hdr(skb);
1232 if (ih3->nsrcs)
1233 goto out;
1234
1235 max_delay = ih3->code ?
1236 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1237 } else {
1238 goto out;
1239 }
1240
1241 if (!group) {
1242 saddr.proto = htons(ETH_P_IP);
1243 saddr.u.ip4 = iph->saddr;
1244
1245 br_multicast_query_received(br, port, &br->ip4_other_query,
1246 &saddr, max_delay);
1247 goto out;
1248 }
1249
1250 mp = br_mdb_ip4_get(br, group, vid);
1251 if (!mp)
1252 goto out;
1253
1254 max_delay *= br->multicast_last_member_count;
1255
1256 if (mp->host_joined &&
1257 (timer_pending(&mp->timer) ?
1258 time_after(mp->timer.expires, now + max_delay) :
1259 try_to_del_timer_sync(&mp->timer) >= 0))
1260 mod_timer(&mp->timer, now + max_delay);
1261
1262 for (pp = &mp->ports;
1263 (p = mlock_dereference(*pp, br)) != NULL;
1264 pp = &p->next) {
1265 if (timer_pending(&p->timer) ?
1266 time_after(p->timer.expires, now + max_delay) :
1267 try_to_del_timer_sync(&p->timer) >= 0)
1268 mod_timer(&p->timer, now + max_delay);
1269 }
1270
1271out:
1272 spin_unlock(&br->multicast_lock);
1273}
1274
1275#if IS_ENABLED(CONFIG_IPV6)
1276static int br_ip6_multicast_query(struct net_bridge *br,
1277 struct net_bridge_port *port,
1278 struct sk_buff *skb,
1279 u16 vid)
1280{
1281 unsigned int transport_len = ipv6_transport_len(skb);
1282 struct mld_msg *mld;
1283 struct net_bridge_mdb_entry *mp;
1284 struct mld2_query *mld2q;
1285 struct net_bridge_port_group *p;
1286 struct net_bridge_port_group __rcu **pp;
1287 struct br_ip saddr;
1288 unsigned long max_delay;
1289 unsigned long now = jiffies;
1290 unsigned int offset = skb_transport_offset(skb);
1291 const struct in6_addr *group = NULL;
1292 bool is_general_query;
1293 int err = 0;
1294
1295 spin_lock(&br->multicast_lock);
1296 if (!netif_running(br->dev) ||
1297 (port && port->state == BR_STATE_DISABLED))
1298 goto out;
1299
1300 if (transport_len == sizeof(*mld)) {
1301 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1302 err = -EINVAL;
1303 goto out;
1304 }
1305 mld = (struct mld_msg *) icmp6_hdr(skb);
1306 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1307 if (max_delay)
1308 group = &mld->mld_mca;
1309 } else {
1310 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1311 err = -EINVAL;
1312 goto out;
1313 }
1314 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1315 if (!mld2q->mld2q_nsrcs)
1316 group = &mld2q->mld2q_mca;
1317
1318 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1319 }
1320
1321 is_general_query = group && ipv6_addr_any(group);
1322
1323 if (is_general_query) {
1324 saddr.proto = htons(ETH_P_IPV6);
1325 saddr.u.ip6 = ipv6_hdr(skb)->saddr;
1326
1327 br_multicast_query_received(br, port, &br->ip6_other_query,
1328 &saddr, max_delay);
1329 goto out;
1330 } else if (!group) {
1331 goto out;
1332 }
1333
1334 mp = br_mdb_ip6_get(br, group, vid);
1335 if (!mp)
1336 goto out;
1337
1338 max_delay *= br->multicast_last_member_count;
1339 if (mp->host_joined &&
1340 (timer_pending(&mp->timer) ?
1341 time_after(mp->timer.expires, now + max_delay) :
1342 try_to_del_timer_sync(&mp->timer) >= 0))
1343 mod_timer(&mp->timer, now + max_delay);
1344
1345 for (pp = &mp->ports;
1346 (p = mlock_dereference(*pp, br)) != NULL;
1347 pp = &p->next) {
1348 if (timer_pending(&p->timer) ?
1349 time_after(p->timer.expires, now + max_delay) :
1350 try_to_del_timer_sync(&p->timer) >= 0)
1351 mod_timer(&p->timer, now + max_delay);
1352 }
1353
1354out:
1355 spin_unlock(&br->multicast_lock);
1356 return err;
1357}
1358#endif
1359
1360static void
1361br_multicast_leave_group(struct net_bridge *br,
1362 struct net_bridge_port *port,
1363 struct br_ip *group,
1364 struct bridge_mcast_other_query *other_query,
1365 struct bridge_mcast_own_query *own_query,
1366 const unsigned char *src)
1367{
1368 struct net_bridge_mdb_entry *mp;
1369 struct net_bridge_port_group *p;
1370 unsigned long now;
1371 unsigned long time;
1372
1373 spin_lock(&br->multicast_lock);
1374 if (!netif_running(br->dev) ||
1375 (port && port->state == BR_STATE_DISABLED))
1376 goto out;
1377
1378 mp = br_mdb_ip_get(br, group);
1379 if (!mp)
1380 goto out;
1381
1382 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1383 struct net_bridge_port_group __rcu **pp;
1384
1385 for (pp = &mp->ports;
1386 (p = mlock_dereference(*pp, br)) != NULL;
1387 pp = &p->next) {
1388 if (!br_port_group_equal(p, port, src))
1389 continue;
1390
1391 if (p->flags & MDB_PG_FLAGS_PERMANENT)
1392 break;
1393
1394 rcu_assign_pointer(*pp, p->next);
1395 hlist_del_init(&p->mglist);
1396 del_timer(&p->timer);
1397 kfree_rcu(p, rcu);
1398 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1399 p->flags);
1400
1401 if (!mp->ports && !mp->host_joined &&
1402 netif_running(br->dev))
1403 mod_timer(&mp->timer, jiffies);
1404 }
1405 goto out;
1406 }
1407
1408 if (timer_pending(&other_query->timer))
1409 goto out;
1410
1411 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
1412 __br_multicast_send_query(br, port, &mp->addr);
1413
1414 time = jiffies + br->multicast_last_member_count *
1415 br->multicast_last_member_interval;
1416
1417 mod_timer(&own_query->timer, time);
1418
1419 for (p = mlock_dereference(mp->ports, br);
1420 p != NULL;
1421 p = mlock_dereference(p->next, br)) {
1422 if (!br_port_group_equal(p, port, src))
1423 continue;
1424
1425 if (!hlist_unhashed(&p->mglist) &&
1426 (timer_pending(&p->timer) ?
1427 time_after(p->timer.expires, time) :
1428 try_to_del_timer_sync(&p->timer) >= 0)) {
1429 mod_timer(&p->timer, time);
1430 }
1431
1432 break;
1433 }
1434 }
1435
1436 now = jiffies;
1437 time = now + br->multicast_last_member_count *
1438 br->multicast_last_member_interval;
1439
1440 if (!port) {
1441 if (mp->host_joined &&
1442 (timer_pending(&mp->timer) ?
1443 time_after(mp->timer.expires, time) :
1444 try_to_del_timer_sync(&mp->timer) >= 0)) {
1445 mod_timer(&mp->timer, time);
1446 }
1447
1448 goto out;
1449 }
1450
1451 for (p = mlock_dereference(mp->ports, br);
1452 p != NULL;
1453 p = mlock_dereference(p->next, br)) {
1454 if (p->port != port)
1455 continue;
1456
1457 if (!hlist_unhashed(&p->mglist) &&
1458 (timer_pending(&p->timer) ?
1459 time_after(p->timer.expires, time) :
1460 try_to_del_timer_sync(&p->timer) >= 0)) {
1461 mod_timer(&p->timer, time);
1462 }
1463
1464 break;
1465 }
1466out:
1467 spin_unlock(&br->multicast_lock);
1468}
1469
1470static void br_ip4_multicast_leave_group(struct net_bridge *br,
1471 struct net_bridge_port *port,
1472 __be32 group,
1473 __u16 vid,
1474 const unsigned char *src)
1475{
1476 struct br_ip br_group;
1477 struct bridge_mcast_own_query *own_query;
1478
1479 if (ipv4_is_local_multicast(group))
1480 return;
1481
1482 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1483
1484 memset(&br_group, 0, sizeof(br_group));
1485 br_group.u.ip4 = group;
1486 br_group.proto = htons(ETH_P_IP);
1487 br_group.vid = vid;
1488
1489 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1490 own_query, src);
1491}
1492
1493#if IS_ENABLED(CONFIG_IPV6)
1494static void br_ip6_multicast_leave_group(struct net_bridge *br,
1495 struct net_bridge_port *port,
1496 const struct in6_addr *group,
1497 __u16 vid,
1498 const unsigned char *src)
1499{
1500 struct br_ip br_group;
1501 struct bridge_mcast_own_query *own_query;
1502
1503 if (ipv6_addr_is_ll_all_nodes(group))
1504 return;
1505
1506 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1507
1508 memset(&br_group, 0, sizeof(br_group));
1509 br_group.u.ip6 = *group;
1510 br_group.proto = htons(ETH_P_IPV6);
1511 br_group.vid = vid;
1512
1513 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1514 own_query, src);
1515}
1516#endif
1517
1518static void br_multicast_err_count(const struct net_bridge *br,
1519 const struct net_bridge_port *p,
1520 __be16 proto)
1521{
1522 struct bridge_mcast_stats __percpu *stats;
1523 struct bridge_mcast_stats *pstats;
1524
1525 if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
1526 return;
1527
1528 if (p)
1529 stats = p->mcast_stats;
1530 else
1531 stats = br->mcast_stats;
1532 if (WARN_ON(!stats))
1533 return;
1534
1535 pstats = this_cpu_ptr(stats);
1536
1537 u64_stats_update_begin(&pstats->syncp);
1538 switch (proto) {
1539 case htons(ETH_P_IP):
1540 pstats->mstats.igmp_parse_errors++;
1541 break;
1542#if IS_ENABLED(CONFIG_IPV6)
1543 case htons(ETH_P_IPV6):
1544 pstats->mstats.mld_parse_errors++;
1545 break;
1546#endif
1547 }
1548 u64_stats_update_end(&pstats->syncp);
1549}
1550
1551static void br_multicast_pim(struct net_bridge *br,
1552 struct net_bridge_port *port,
1553 const struct sk_buff *skb)
1554{
1555 unsigned int offset = skb_transport_offset(skb);
1556 struct pimhdr *pimhdr, _pimhdr;
1557
1558 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1559 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1560 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1561 return;
1562
1563 br_multicast_mark_router(br, port);
1564}
1565
1566static int br_ip4_multicast_mrd_rcv(struct net_bridge *br,
1567 struct net_bridge_port *port,
1568 struct sk_buff *skb)
1569{
1570 if (ip_hdr(skb)->protocol != IPPROTO_IGMP ||
1571 igmp_hdr(skb)->type != IGMP_MRDISC_ADV)
1572 return -ENOMSG;
1573
1574 br_multicast_mark_router(br, port);
1575
1576 return 0;
1577}
1578
1579static int br_multicast_ipv4_rcv(struct net_bridge *br,
1580 struct net_bridge_port *port,
1581 struct sk_buff *skb,
1582 u16 vid)
1583{
1584 const unsigned char *src;
1585 struct igmphdr *ih;
1586 int err;
1587
1588 err = ip_mc_check_igmp(skb);
1589
1590 if (err == -ENOMSG) {
1591 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
1592 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1593 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1594 if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1595 br_multicast_pim(br, port, skb);
1596 } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) {
1597 br_ip4_multicast_mrd_rcv(br, port, skb);
1598 }
1599
1600 return 0;
1601 } else if (err < 0) {
1602 br_multicast_err_count(br, port, skb->protocol);
1603 return err;
1604 }
1605
1606 ih = igmp_hdr(skb);
1607 src = eth_hdr(skb)->h_source;
1608 BR_INPUT_SKB_CB(skb)->igmp = ih->type;
1609
1610 switch (ih->type) {
1611 case IGMP_HOST_MEMBERSHIP_REPORT:
1612 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1613 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1614 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
1615 break;
1616 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1617 err = br_ip4_multicast_igmp3_report(br, port, skb, vid);
1618 break;
1619 case IGMP_HOST_MEMBERSHIP_QUERY:
1620 br_ip4_multicast_query(br, port, skb, vid);
1621 break;
1622 case IGMP_HOST_LEAVE_MESSAGE:
1623 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
1624 break;
1625 }
1626
1627 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1628 BR_MCAST_DIR_RX);
1629
1630 return err;
1631}
1632
1633#if IS_ENABLED(CONFIG_IPV6)
1634static int br_ip6_multicast_mrd_rcv(struct net_bridge *br,
1635 struct net_bridge_port *port,
1636 struct sk_buff *skb)
1637{
1638 int ret;
1639
1640 if (ipv6_hdr(skb)->nexthdr != IPPROTO_ICMPV6)
1641 return -ENOMSG;
1642
1643 ret = ipv6_mc_check_icmpv6(skb);
1644 if (ret < 0)
1645 return ret;
1646
1647 if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV)
1648 return -ENOMSG;
1649
1650 br_multicast_mark_router(br, port);
1651
1652 return 0;
1653}
1654
1655static int br_multicast_ipv6_rcv(struct net_bridge *br,
1656 struct net_bridge_port *port,
1657 struct sk_buff *skb,
1658 u16 vid)
1659{
1660 const unsigned char *src;
1661 struct mld_msg *mld;
1662 int err;
1663
1664 err = ipv6_mc_check_mld(skb);
1665
1666 if (err == -ENOMSG) {
1667 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1668 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1669
1670 if (ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr)) {
1671 err = br_ip6_multicast_mrd_rcv(br, port, skb);
1672
1673 if (err < 0 && err != -ENOMSG) {
1674 br_multicast_err_count(br, port, skb->protocol);
1675 return err;
1676 }
1677 }
1678
1679 return 0;
1680 } else if (err < 0) {
1681 br_multicast_err_count(br, port, skb->protocol);
1682 return err;
1683 }
1684
1685 mld = (struct mld_msg *)skb_transport_header(skb);
1686 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
1687
1688 switch (mld->mld_type) {
1689 case ICMPV6_MGM_REPORT:
1690 src = eth_hdr(skb)->h_source;
1691 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1692 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
1693 src);
1694 break;
1695 case ICMPV6_MLD2_REPORT:
1696 err = br_ip6_multicast_mld2_report(br, port, skb, vid);
1697 break;
1698 case ICMPV6_MGM_QUERY:
1699 err = br_ip6_multicast_query(br, port, skb, vid);
1700 break;
1701 case ICMPV6_MGM_REDUCTION:
1702 src = eth_hdr(skb)->h_source;
1703 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
1704 break;
1705 }
1706
1707 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1708 BR_MCAST_DIR_RX);
1709
1710 return err;
1711}
1712#endif
1713
1714int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1715 struct sk_buff *skb, u16 vid)
1716{
1717 int ret = 0;
1718
1719 BR_INPUT_SKB_CB(skb)->igmp = 0;
1720 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1721
1722 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
1723 return 0;
1724
1725 switch (skb->protocol) {
1726 case htons(ETH_P_IP):
1727 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1728 break;
1729#if IS_ENABLED(CONFIG_IPV6)
1730 case htons(ETH_P_IPV6):
1731 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1732 break;
1733#endif
1734 }
1735
1736 return ret;
1737}
1738
1739static void br_multicast_query_expired(struct net_bridge *br,
1740 struct bridge_mcast_own_query *query,
1741 struct bridge_mcast_querier *querier)
1742{
1743 spin_lock(&br->multicast_lock);
1744 if (query->startup_sent < br->multicast_startup_query_count)
1745 query->startup_sent++;
1746
1747 RCU_INIT_POINTER(querier->port, NULL);
1748 br_multicast_send_query(br, NULL, query);
1749 spin_unlock(&br->multicast_lock);
1750}
1751
1752static void br_ip4_multicast_query_expired(struct timer_list *t)
1753{
1754 struct net_bridge *br = from_timer(br, t, ip4_own_query.timer);
1755
1756 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1757}
1758
1759#if IS_ENABLED(CONFIG_IPV6)
1760static void br_ip6_multicast_query_expired(struct timer_list *t)
1761{
1762 struct net_bridge *br = from_timer(br, t, ip6_own_query.timer);
1763
1764 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1765}
1766#endif
1767
1768void br_multicast_init(struct net_bridge *br)
1769{
1770 br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX;
1771
1772 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1773 br->multicast_last_member_count = 2;
1774 br->multicast_startup_query_count = 2;
1775
1776 br->multicast_last_member_interval = HZ;
1777 br->multicast_query_response_interval = 10 * HZ;
1778 br->multicast_startup_query_interval = 125 * HZ / 4;
1779 br->multicast_query_interval = 125 * HZ;
1780 br->multicast_querier_interval = 255 * HZ;
1781 br->multicast_membership_interval = 260 * HZ;
1782
1783 br->ip4_other_query.delay_time = 0;
1784 br->ip4_querier.port = NULL;
1785 br->multicast_igmp_version = 2;
1786#if IS_ENABLED(CONFIG_IPV6)
1787 br->multicast_mld_version = 1;
1788 br->ip6_other_query.delay_time = 0;
1789 br->ip6_querier.port = NULL;
1790#endif
1791 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true);
1792 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
1793
1794 spin_lock_init(&br->multicast_lock);
1795 timer_setup(&br->multicast_router_timer,
1796 br_multicast_local_router_expired, 0);
1797 timer_setup(&br->ip4_other_query.timer,
1798 br_ip4_multicast_querier_expired, 0);
1799 timer_setup(&br->ip4_own_query.timer,
1800 br_ip4_multicast_query_expired, 0);
1801#if IS_ENABLED(CONFIG_IPV6)
1802 timer_setup(&br->ip6_other_query.timer,
1803 br_ip6_multicast_querier_expired, 0);
1804 timer_setup(&br->ip6_own_query.timer,
1805 br_ip6_multicast_query_expired, 0);
1806#endif
1807 INIT_HLIST_HEAD(&br->mdb_list);
1808}
1809
1810static void br_ip4_multicast_join_snoopers(struct net_bridge *br)
1811{
1812 struct in_device *in_dev = in_dev_get(br->dev);
1813
1814 if (!in_dev)
1815 return;
1816
1817 __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
1818 in_dev_put(in_dev);
1819}
1820
1821#if IS_ENABLED(CONFIG_IPV6)
1822static void br_ip6_multicast_join_snoopers(struct net_bridge *br)
1823{
1824 struct in6_addr addr;
1825
1826 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
1827 ipv6_dev_mc_inc(br->dev, &addr);
1828}
1829#else
1830static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br)
1831{
1832}
1833#endif
1834
1835static void br_multicast_join_snoopers(struct net_bridge *br)
1836{
1837 br_ip4_multicast_join_snoopers(br);
1838 br_ip6_multicast_join_snoopers(br);
1839}
1840
1841static void br_ip4_multicast_leave_snoopers(struct net_bridge *br)
1842{
1843 struct in_device *in_dev = in_dev_get(br->dev);
1844
1845 if (WARN_ON(!in_dev))
1846 return;
1847
1848 __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
1849 in_dev_put(in_dev);
1850}
1851
1852#if IS_ENABLED(CONFIG_IPV6)
1853static void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
1854{
1855 struct in6_addr addr;
1856
1857 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
1858 ipv6_dev_mc_dec(br->dev, &addr);
1859}
1860#else
1861static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
1862{
1863}
1864#endif
1865
1866static void br_multicast_leave_snoopers(struct net_bridge *br)
1867{
1868 br_ip4_multicast_leave_snoopers(br);
1869 br_ip6_multicast_leave_snoopers(br);
1870}
1871
1872static void __br_multicast_open(struct net_bridge *br,
1873 struct bridge_mcast_own_query *query)
1874{
1875 query->startup_sent = 0;
1876
1877 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
1878 return;
1879
1880 mod_timer(&query->timer, jiffies);
1881}
1882
1883void br_multicast_open(struct net_bridge *br)
1884{
1885 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
1886 br_multicast_join_snoopers(br);
1887
1888 __br_multicast_open(br, &br->ip4_own_query);
1889#if IS_ENABLED(CONFIG_IPV6)
1890 __br_multicast_open(br, &br->ip6_own_query);
1891#endif
1892}
1893
1894void br_multicast_stop(struct net_bridge *br)
1895{
1896 del_timer_sync(&br->multicast_router_timer);
1897 del_timer_sync(&br->ip4_other_query.timer);
1898 del_timer_sync(&br->ip4_own_query.timer);
1899#if IS_ENABLED(CONFIG_IPV6)
1900 del_timer_sync(&br->ip6_other_query.timer);
1901 del_timer_sync(&br->ip6_own_query.timer);
1902#endif
1903
1904 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
1905 br_multicast_leave_snoopers(br);
1906}
1907
1908void br_multicast_dev_del(struct net_bridge *br)
1909{
1910 struct net_bridge_mdb_entry *mp;
1911 struct hlist_node *tmp;
1912
1913 spin_lock_bh(&br->multicast_lock);
1914 hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node) {
1915 del_timer(&mp->timer);
1916 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
1917 br_mdb_rht_params);
1918 hlist_del_rcu(&mp->mdb_node);
1919 kfree_rcu(mp, rcu);
1920 }
1921 spin_unlock_bh(&br->multicast_lock);
1922
1923 rcu_barrier();
1924}
1925
1926int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1927{
1928 int err = -EINVAL;
1929
1930 spin_lock_bh(&br->multicast_lock);
1931
1932 switch (val) {
1933 case MDB_RTR_TYPE_DISABLED:
1934 case MDB_RTR_TYPE_PERM:
1935 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM);
1936 del_timer(&br->multicast_router_timer);
1937 br->multicast_router = val;
1938 err = 0;
1939 break;
1940 case MDB_RTR_TYPE_TEMP_QUERY:
1941 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
1942 br_mc_router_state_change(br, false);
1943 br->multicast_router = val;
1944 err = 0;
1945 break;
1946 }
1947
1948 spin_unlock_bh(&br->multicast_lock);
1949
1950 return err;
1951}
1952
1953static void __del_port_router(struct net_bridge_port *p)
1954{
1955 if (hlist_unhashed(&p->rlist))
1956 return;
1957 hlist_del_init_rcu(&p->rlist);
1958 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
1959 br_port_mc_router_state_change(p, false);
1960
1961
1962 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1963 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1964}
1965
1966int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1967{
1968 struct net_bridge *br = p->br;
1969 unsigned long now = jiffies;
1970 int err = -EINVAL;
1971
1972 spin_lock(&br->multicast_lock);
1973 if (p->multicast_router == val) {
1974
1975 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1976 mod_timer(&p->multicast_router_timer,
1977 now + br->multicast_querier_interval);
1978 err = 0;
1979 goto unlock;
1980 }
1981 switch (val) {
1982 case MDB_RTR_TYPE_DISABLED:
1983 p->multicast_router = MDB_RTR_TYPE_DISABLED;
1984 __del_port_router(p);
1985 del_timer(&p->multicast_router_timer);
1986 break;
1987 case MDB_RTR_TYPE_TEMP_QUERY:
1988 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1989 __del_port_router(p);
1990 break;
1991 case MDB_RTR_TYPE_PERM:
1992 p->multicast_router = MDB_RTR_TYPE_PERM;
1993 del_timer(&p->multicast_router_timer);
1994 br_multicast_add_router(br, p);
1995 break;
1996 case MDB_RTR_TYPE_TEMP:
1997 p->multicast_router = MDB_RTR_TYPE_TEMP;
1998 br_multicast_mark_router(br, p);
1999 break;
2000 default:
2001 goto unlock;
2002 }
2003 err = 0;
2004unlock:
2005 spin_unlock(&br->multicast_lock);
2006
2007 return err;
2008}
2009
2010static void br_multicast_start_querier(struct net_bridge *br,
2011 struct bridge_mcast_own_query *query)
2012{
2013 struct net_bridge_port *port;
2014
2015 __br_multicast_open(br, query);
2016
2017 rcu_read_lock();
2018 list_for_each_entry_rcu(port, &br->port_list, list) {
2019 if (port->state == BR_STATE_DISABLED ||
2020 port->state == BR_STATE_BLOCKING)
2021 continue;
2022
2023 if (query == &br->ip4_own_query)
2024 br_multicast_enable(&port->ip4_own_query);
2025#if IS_ENABLED(CONFIG_IPV6)
2026 else
2027 br_multicast_enable(&port->ip6_own_query);
2028#endif
2029 }
2030 rcu_read_unlock();
2031}
2032
2033int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2034{
2035 struct net_bridge_port *port;
2036
2037 spin_lock_bh(&br->multicast_lock);
2038 if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val)
2039 goto unlock;
2040
2041 br_mc_disabled_update(br->dev, val);
2042 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val);
2043 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) {
2044 br_multicast_leave_snoopers(br);
2045 goto unlock;
2046 }
2047
2048 if (!netif_running(br->dev))
2049 goto unlock;
2050
2051 br_multicast_open(br);
2052 list_for_each_entry(port, &br->port_list, list)
2053 __br_multicast_enable_port(port);
2054
2055unlock:
2056 spin_unlock_bh(&br->multicast_lock);
2057
2058 return 0;
2059}
2060
2061bool br_multicast_enabled(const struct net_device *dev)
2062{
2063 struct net_bridge *br = netdev_priv(dev);
2064
2065 return !!br_opt_get(br, BROPT_MULTICAST_ENABLED);
2066}
2067EXPORT_SYMBOL_GPL(br_multicast_enabled);
2068
2069bool br_multicast_router(const struct net_device *dev)
2070{
2071 struct net_bridge *br = netdev_priv(dev);
2072 bool is_router;
2073
2074 spin_lock_bh(&br->multicast_lock);
2075 is_router = br_multicast_is_router(br);
2076 spin_unlock_bh(&br->multicast_lock);
2077 return is_router;
2078}
2079EXPORT_SYMBOL_GPL(br_multicast_router);
2080
2081int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2082{
2083 unsigned long max_delay;
2084
2085 val = !!val;
2086
2087 spin_lock_bh(&br->multicast_lock);
2088 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val)
2089 goto unlock;
2090
2091 br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val);
2092 if (!val)
2093 goto unlock;
2094
2095 max_delay = br->multicast_query_response_interval;
2096
2097 if (!timer_pending(&br->ip4_other_query.timer))
2098 br->ip4_other_query.delay_time = jiffies + max_delay;
2099
2100 br_multicast_start_querier(br, &br->ip4_own_query);
2101
2102#if IS_ENABLED(CONFIG_IPV6)
2103 if (!timer_pending(&br->ip6_other_query.timer))
2104 br->ip6_other_query.delay_time = jiffies + max_delay;
2105
2106 br_multicast_start_querier(br, &br->ip6_own_query);
2107#endif
2108
2109unlock:
2110 spin_unlock_bh(&br->multicast_lock);
2111
2112 return 0;
2113}
2114
2115int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2116{
2117
2118 switch (val) {
2119 case 2:
2120 case 3:
2121 break;
2122 default:
2123 return -EINVAL;
2124 }
2125
2126 spin_lock_bh(&br->multicast_lock);
2127 br->multicast_igmp_version = val;
2128 spin_unlock_bh(&br->multicast_lock);
2129
2130 return 0;
2131}
2132
2133#if IS_ENABLED(CONFIG_IPV6)
2134int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2135{
2136
2137 switch (val) {
2138 case 1:
2139 case 2:
2140 break;
2141 default:
2142 return -EINVAL;
2143 }
2144
2145 spin_lock_bh(&br->multicast_lock);
2146 br->multicast_mld_version = val;
2147 spin_unlock_bh(&br->multicast_lock);
2148
2149 return 0;
2150}
2151#endif
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170int br_multicast_list_adjacent(struct net_device *dev,
2171 struct list_head *br_ip_list)
2172{
2173 struct net_bridge *br;
2174 struct net_bridge_port *port;
2175 struct net_bridge_port_group *group;
2176 struct br_ip_list *entry;
2177 int count = 0;
2178
2179 rcu_read_lock();
2180 if (!br_ip_list || !netif_is_bridge_port(dev))
2181 goto unlock;
2182
2183 port = br_port_get_rcu(dev);
2184 if (!port || !port->br)
2185 goto unlock;
2186
2187 br = port->br;
2188
2189 list_for_each_entry_rcu(port, &br->port_list, list) {
2190 if (!port->dev || port->dev == dev)
2191 continue;
2192
2193 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2194 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2195 if (!entry)
2196 goto unlock;
2197
2198 entry->addr = group->addr;
2199 list_add(&entry->list, br_ip_list);
2200 count++;
2201 }
2202 }
2203
2204unlock:
2205 rcu_read_unlock();
2206 return count;
2207}
2208EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2220{
2221 struct net_bridge *br;
2222 struct net_bridge_port *port;
2223 struct ethhdr eth;
2224 bool ret = false;
2225
2226 rcu_read_lock();
2227 if (!netif_is_bridge_port(dev))
2228 goto unlock;
2229
2230 port = br_port_get_rcu(dev);
2231 if (!port || !port->br)
2232 goto unlock;
2233
2234 br = port->br;
2235
2236 memset(ð, 0, sizeof(eth));
2237 eth.h_proto = htons(proto);
2238
2239 ret = br_multicast_querier_exists(br, ð);
2240
2241unlock:
2242 rcu_read_unlock();
2243 return ret;
2244}
2245EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2257{
2258 struct net_bridge *br;
2259 struct net_bridge_port *port;
2260 bool ret = false;
2261
2262 rcu_read_lock();
2263 if (!netif_is_bridge_port(dev))
2264 goto unlock;
2265
2266 port = br_port_get_rcu(dev);
2267 if (!port || !port->br)
2268 goto unlock;
2269
2270 br = port->br;
2271
2272 switch (proto) {
2273 case ETH_P_IP:
2274 if (!timer_pending(&br->ip4_other_query.timer) ||
2275 rcu_dereference(br->ip4_querier.port) == port)
2276 goto unlock;
2277 break;
2278#if IS_ENABLED(CONFIG_IPV6)
2279 case ETH_P_IPV6:
2280 if (!timer_pending(&br->ip6_other_query.timer) ||
2281 rcu_dereference(br->ip6_querier.port) == port)
2282 goto unlock;
2283 break;
2284#endif
2285 default:
2286 goto unlock;
2287 }
2288
2289 ret = true;
2290unlock:
2291 rcu_read_unlock();
2292 return ret;
2293}
2294EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2295
2296static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
2297 const struct sk_buff *skb, u8 type, u8 dir)
2298{
2299 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
2300 __be16 proto = skb->protocol;
2301 unsigned int t_len;
2302
2303 u64_stats_update_begin(&pstats->syncp);
2304 switch (proto) {
2305 case htons(ETH_P_IP):
2306 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
2307 switch (type) {
2308 case IGMP_HOST_MEMBERSHIP_REPORT:
2309 pstats->mstats.igmp_v1reports[dir]++;
2310 break;
2311 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2312 pstats->mstats.igmp_v2reports[dir]++;
2313 break;
2314 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2315 pstats->mstats.igmp_v3reports[dir]++;
2316 break;
2317 case IGMP_HOST_MEMBERSHIP_QUERY:
2318 if (t_len != sizeof(struct igmphdr)) {
2319 pstats->mstats.igmp_v3queries[dir]++;
2320 } else {
2321 unsigned int offset = skb_transport_offset(skb);
2322 struct igmphdr *ih, _ihdr;
2323
2324 ih = skb_header_pointer(skb, offset,
2325 sizeof(_ihdr), &_ihdr);
2326 if (!ih)
2327 break;
2328 if (!ih->code)
2329 pstats->mstats.igmp_v1queries[dir]++;
2330 else
2331 pstats->mstats.igmp_v2queries[dir]++;
2332 }
2333 break;
2334 case IGMP_HOST_LEAVE_MESSAGE:
2335 pstats->mstats.igmp_leaves[dir]++;
2336 break;
2337 }
2338 break;
2339#if IS_ENABLED(CONFIG_IPV6)
2340 case htons(ETH_P_IPV6):
2341 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2342 sizeof(struct ipv6hdr);
2343 t_len -= skb_network_header_len(skb);
2344 switch (type) {
2345 case ICMPV6_MGM_REPORT:
2346 pstats->mstats.mld_v1reports[dir]++;
2347 break;
2348 case ICMPV6_MLD2_REPORT:
2349 pstats->mstats.mld_v2reports[dir]++;
2350 break;
2351 case ICMPV6_MGM_QUERY:
2352 if (t_len != sizeof(struct mld_msg))
2353 pstats->mstats.mld_v2queries[dir]++;
2354 else
2355 pstats->mstats.mld_v1queries[dir]++;
2356 break;
2357 case ICMPV6_MGM_REDUCTION:
2358 pstats->mstats.mld_leaves[dir]++;
2359 break;
2360 }
2361 break;
2362#endif
2363 }
2364 u64_stats_update_end(&pstats->syncp);
2365}
2366
2367void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
2368 const struct sk_buff *skb, u8 type, u8 dir)
2369{
2370 struct bridge_mcast_stats __percpu *stats;
2371
2372
2373 if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
2374 return;
2375
2376 if (p)
2377 stats = p->mcast_stats;
2378 else
2379 stats = br->mcast_stats;
2380 if (WARN_ON(!stats))
2381 return;
2382
2383 br_mcast_stats_add(stats, skb, type, dir);
2384}
2385
2386int br_multicast_init_stats(struct net_bridge *br)
2387{
2388 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2389 if (!br->mcast_stats)
2390 return -ENOMEM;
2391
2392 return 0;
2393}
2394
2395void br_multicast_uninit_stats(struct net_bridge *br)
2396{
2397 free_percpu(br->mcast_stats);
2398}
2399
2400static void mcast_stats_add_dir(u64 *dst, u64 *src)
2401{
2402 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2403 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2404}
2405
2406void br_multicast_get_stats(const struct net_bridge *br,
2407 const struct net_bridge_port *p,
2408 struct br_mcast_stats *dest)
2409{
2410 struct bridge_mcast_stats __percpu *stats;
2411 struct br_mcast_stats tdst;
2412 int i;
2413
2414 memset(dest, 0, sizeof(*dest));
2415 if (p)
2416 stats = p->mcast_stats;
2417 else
2418 stats = br->mcast_stats;
2419 if (WARN_ON(!stats))
2420 return;
2421
2422 memset(&tdst, 0, sizeof(tdst));
2423 for_each_possible_cpu(i) {
2424 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2425 struct br_mcast_stats temp;
2426 unsigned int start;
2427
2428 do {
2429 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2430 memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2431 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2432
2433 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2434 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2435 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
2436 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2437 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2438 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2439 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2440 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2441
2442 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2443 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
2444 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2445 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2446 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2447 tdst.mld_parse_errors += temp.mld_parse_errors;
2448 }
2449 memcpy(dest, &tdst, sizeof(*dest));
2450}
2451
2452int br_mdb_hash_init(struct net_bridge *br)
2453{
2454 return rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params);
2455}
2456
2457void br_mdb_hash_fini(struct net_bridge *br)
2458{
2459 rhashtable_destroy(&br->mdb_hash_tbl);
2460}
2461
