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Merge tag 'drm/tegra/for-5.1-rc5' of git://anongit.freedesktop.org/tegra/linux into...
[thirdparty/kernel/stable.git] / net / bridge / br_multicast.c
1 /*
2 * Bridge multicast support.
3 *
4 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13 #include <linux/err.h>
14 #include <linux/export.h>
15 #include <linux/if_ether.h>
16 #include <linux/igmp.h>
17 #include <linux/in.h>
18 #include <linux/jhash.h>
19 #include <linux/kernel.h>
20 #include <linux/log2.h>
21 #include <linux/netdevice.h>
22 #include <linux/netfilter_bridge.h>
23 #include <linux/random.h>
24 #include <linux/rculist.h>
25 #include <linux/skbuff.h>
26 #include <linux/slab.h>
27 #include <linux/timer.h>
28 #include <linux/inetdevice.h>
29 #include <linux/mroute.h>
30 #include <net/ip.h>
31 #include <net/switchdev.h>
32 #if IS_ENABLED(CONFIG_IPV6)
33 #include <linux/icmpv6.h>
34 #include <net/ipv6.h>
35 #include <net/mld.h>
36 #include <net/ip6_checksum.h>
37 #include <net/addrconf.h>
38 #endif
39
40 #include "br_private.h"
41
42 static const struct rhashtable_params br_mdb_rht_params = {
43 .head_offset = offsetof(struct net_bridge_mdb_entry, rhnode),
44 .key_offset = offsetof(struct net_bridge_mdb_entry, addr),
45 .key_len = sizeof(struct br_ip),
46 .automatic_shrinking = true,
47 .locks_mul = 1,
48 };
49
50 static void br_multicast_start_querier(struct net_bridge *br,
51 struct bridge_mcast_own_query *query);
52 static void br_multicast_add_router(struct net_bridge *br,
53 struct net_bridge_port *port);
54 static void br_ip4_multicast_leave_group(struct net_bridge *br,
55 struct net_bridge_port *port,
56 __be32 group,
57 __u16 vid,
58 const unsigned char *src);
59
60 static void __del_port_router(struct net_bridge_port *p);
61 #if IS_ENABLED(CONFIG_IPV6)
62 static void br_ip6_multicast_leave_group(struct net_bridge *br,
63 struct net_bridge_port *port,
64 const struct in6_addr *group,
65 __u16 vid, const unsigned char *src);
66 #endif
67
68 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
69 {
70 if (a->proto != b->proto)
71 return 0;
72 if (a->vid != b->vid)
73 return 0;
74 switch (a->proto) {
75 case htons(ETH_P_IP):
76 return a->u.ip4 == b->u.ip4;
77 #if IS_ENABLED(CONFIG_IPV6)
78 case htons(ETH_P_IPV6):
79 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
80 #endif
81 }
82 return 0;
83 }
84
85 static struct net_bridge_mdb_entry *br_mdb_ip_get_rcu(struct net_bridge *br,
86 struct br_ip *dst)
87 {
88 return rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
89 }
90
91 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge *br,
92 struct br_ip *dst)
93 {
94 struct net_bridge_mdb_entry *ent;
95
96 lockdep_assert_held_once(&br->multicast_lock);
97
98 rcu_read_lock();
99 ent = rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
100 rcu_read_unlock();
101
102 return ent;
103 }
104
105 static struct net_bridge_mdb_entry *br_mdb_ip4_get(struct net_bridge *br,
106 __be32 dst, __u16 vid)
107 {
108 struct br_ip br_dst;
109
110 memset(&br_dst, 0, sizeof(br_dst));
111 br_dst.u.ip4 = dst;
112 br_dst.proto = htons(ETH_P_IP);
113 br_dst.vid = vid;
114
115 return br_mdb_ip_get(br, &br_dst);
116 }
117
118 #if IS_ENABLED(CONFIG_IPV6)
119 static struct net_bridge_mdb_entry *br_mdb_ip6_get(struct net_bridge *br,
120 const struct in6_addr *dst,
121 __u16 vid)
122 {
123 struct br_ip br_dst;
124
125 memset(&br_dst, 0, sizeof(br_dst));
126 br_dst.u.ip6 = *dst;
127 br_dst.proto = htons(ETH_P_IPV6);
128 br_dst.vid = vid;
129
130 return br_mdb_ip_get(br, &br_dst);
131 }
132 #endif
133
134 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
135 struct sk_buff *skb, u16 vid)
136 {
137 struct br_ip ip;
138
139 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
140 return NULL;
141
142 if (BR_INPUT_SKB_CB(skb)->igmp)
143 return NULL;
144
145 memset(&ip, 0, sizeof(ip));
146 ip.proto = skb->protocol;
147 ip.vid = vid;
148
149 switch (skb->protocol) {
150 case htons(ETH_P_IP):
151 ip.u.ip4 = ip_hdr(skb)->daddr;
152 break;
153 #if IS_ENABLED(CONFIG_IPV6)
154 case htons(ETH_P_IPV6):
155 ip.u.ip6 = ipv6_hdr(skb)->daddr;
156 break;
157 #endif
158 default:
159 return NULL;
160 }
161
162 return br_mdb_ip_get_rcu(br, &ip);
163 }
164
165 static void br_multicast_group_expired(struct timer_list *t)
166 {
167 struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer);
168 struct net_bridge *br = mp->br;
169
170 spin_lock(&br->multicast_lock);
171 if (!netif_running(br->dev) || timer_pending(&mp->timer))
172 goto out;
173
174 mp->host_joined = false;
175 br_mdb_notify(br->dev, NULL, &mp->addr, RTM_DELMDB, 0);
176
177 if (mp->ports)
178 goto out;
179
180 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
181 br_mdb_rht_params);
182 hlist_del_rcu(&mp->mdb_node);
183
184 kfree_rcu(mp, rcu);
185
186 out:
187 spin_unlock(&br->multicast_lock);
188 }
189
190 static void br_multicast_del_pg(struct net_bridge *br,
191 struct net_bridge_port_group *pg)
192 {
193 struct net_bridge_mdb_entry *mp;
194 struct net_bridge_port_group *p;
195 struct net_bridge_port_group __rcu **pp;
196
197 mp = br_mdb_ip_get(br, &pg->addr);
198 if (WARN_ON(!mp))
199 return;
200
201 for (pp = &mp->ports;
202 (p = mlock_dereference(*pp, br)) != NULL;
203 pp = &p->next) {
204 if (p != pg)
205 continue;
206
207 rcu_assign_pointer(*pp, p->next);
208 hlist_del_init(&p->mglist);
209 del_timer(&p->timer);
210 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
211 p->flags);
212 kfree_rcu(p, rcu);
213
214 if (!mp->ports && !mp->host_joined &&
215 netif_running(br->dev))
216 mod_timer(&mp->timer, jiffies);
217
218 return;
219 }
220
221 WARN_ON(1);
222 }
223
224 static void br_multicast_port_group_expired(struct timer_list *t)
225 {
226 struct net_bridge_port_group *pg = from_timer(pg, t, timer);
227 struct net_bridge *br = pg->port->br;
228
229 spin_lock(&br->multicast_lock);
230 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
231 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
232 goto out;
233
234 br_multicast_del_pg(br, pg);
235
236 out:
237 spin_unlock(&br->multicast_lock);
238 }
239
240 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
241 __be32 group,
242 u8 *igmp_type)
243 {
244 struct igmpv3_query *ihv3;
245 size_t igmp_hdr_size;
246 struct sk_buff *skb;
247 struct igmphdr *ih;
248 struct ethhdr *eth;
249 struct iphdr *iph;
250
251 igmp_hdr_size = sizeof(*ih);
252 if (br->multicast_igmp_version == 3)
253 igmp_hdr_size = sizeof(*ihv3);
254 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
255 igmp_hdr_size + 4);
256 if (!skb)
257 goto out;
258
259 skb->protocol = htons(ETH_P_IP);
260
261 skb_reset_mac_header(skb);
262 eth = eth_hdr(skb);
263
264 ether_addr_copy(eth->h_source, br->dev->dev_addr);
265 eth->h_dest[0] = 1;
266 eth->h_dest[1] = 0;
267 eth->h_dest[2] = 0x5e;
268 eth->h_dest[3] = 0;
269 eth->h_dest[4] = 0;
270 eth->h_dest[5] = 1;
271 eth->h_proto = htons(ETH_P_IP);
272 skb_put(skb, sizeof(*eth));
273
274 skb_set_network_header(skb, skb->len);
275 iph = ip_hdr(skb);
276
277 iph->version = 4;
278 iph->ihl = 6;
279 iph->tos = 0xc0;
280 iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4);
281 iph->id = 0;
282 iph->frag_off = htons(IP_DF);
283 iph->ttl = 1;
284 iph->protocol = IPPROTO_IGMP;
285 iph->saddr = br_opt_get(br, BROPT_MULTICAST_QUERY_USE_IFADDR) ?
286 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
287 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
288 ((u8 *)&iph[1])[0] = IPOPT_RA;
289 ((u8 *)&iph[1])[1] = 4;
290 ((u8 *)&iph[1])[2] = 0;
291 ((u8 *)&iph[1])[3] = 0;
292 ip_send_check(iph);
293 skb_put(skb, 24);
294
295 skb_set_transport_header(skb, skb->len);
296 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
297
298 switch (br->multicast_igmp_version) {
299 case 2:
300 ih = igmp_hdr(skb);
301 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
302 ih->code = (group ? br->multicast_last_member_interval :
303 br->multicast_query_response_interval) /
304 (HZ / IGMP_TIMER_SCALE);
305 ih->group = group;
306 ih->csum = 0;
307 ih->csum = ip_compute_csum((void *)ih, sizeof(*ih));
308 break;
309 case 3:
310 ihv3 = igmpv3_query_hdr(skb);
311 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
312 ihv3->code = (group ? br->multicast_last_member_interval :
313 br->multicast_query_response_interval) /
314 (HZ / IGMP_TIMER_SCALE);
315 ihv3->group = group;
316 ihv3->qqic = br->multicast_query_interval / HZ;
317 ihv3->nsrcs = 0;
318 ihv3->resv = 0;
319 ihv3->suppress = 0;
320 ihv3->qrv = 2;
321 ihv3->csum = 0;
322 ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3));
323 break;
324 }
325
326 skb_put(skb, igmp_hdr_size);
327 __skb_pull(skb, sizeof(*eth));
328
329 out:
330 return skb;
331 }
332
333 #if IS_ENABLED(CONFIG_IPV6)
334 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
335 const struct in6_addr *grp,
336 u8 *igmp_type)
337 {
338 struct mld2_query *mld2q;
339 unsigned long interval;
340 struct ipv6hdr *ip6h;
341 struct mld_msg *mldq;
342 size_t mld_hdr_size;
343 struct sk_buff *skb;
344 struct ethhdr *eth;
345 u8 *hopopt;
346
347 mld_hdr_size = sizeof(*mldq);
348 if (br->multicast_mld_version == 2)
349 mld_hdr_size = sizeof(*mld2q);
350 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
351 8 + mld_hdr_size);
352 if (!skb)
353 goto out;
354
355 skb->protocol = htons(ETH_P_IPV6);
356
357 /* Ethernet header */
358 skb_reset_mac_header(skb);
359 eth = eth_hdr(skb);
360
361 ether_addr_copy(eth->h_source, br->dev->dev_addr);
362 eth->h_proto = htons(ETH_P_IPV6);
363 skb_put(skb, sizeof(*eth));
364
365 /* IPv6 header + HbH option */
366 skb_set_network_header(skb, skb->len);
367 ip6h = ipv6_hdr(skb);
368
369 *(__force __be32 *)ip6h = htonl(0x60000000);
370 ip6h->payload_len = htons(8 + mld_hdr_size);
371 ip6h->nexthdr = IPPROTO_HOPOPTS;
372 ip6h->hop_limit = 1;
373 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
374 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
375 &ip6h->saddr)) {
376 kfree_skb(skb);
377 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, false);
378 return NULL;
379 }
380
381 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
382 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
383
384 hopopt = (u8 *)(ip6h + 1);
385 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
386 hopopt[1] = 0; /* length of HbH */
387 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
388 hopopt[3] = 2; /* Length of RA Option */
389 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
390 hopopt[5] = 0;
391 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
392 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
393
394 skb_put(skb, sizeof(*ip6h) + 8);
395
396 /* ICMPv6 */
397 skb_set_transport_header(skb, skb->len);
398 interval = ipv6_addr_any(grp) ?
399 br->multicast_query_response_interval :
400 br->multicast_last_member_interval;
401 *igmp_type = ICMPV6_MGM_QUERY;
402 switch (br->multicast_mld_version) {
403 case 1:
404 mldq = (struct mld_msg *)icmp6_hdr(skb);
405 mldq->mld_type = ICMPV6_MGM_QUERY;
406 mldq->mld_code = 0;
407 mldq->mld_cksum = 0;
408 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
409 mldq->mld_reserved = 0;
410 mldq->mld_mca = *grp;
411 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
412 sizeof(*mldq), IPPROTO_ICMPV6,
413 csum_partial(mldq,
414 sizeof(*mldq),
415 0));
416 break;
417 case 2:
418 mld2q = (struct mld2_query *)icmp6_hdr(skb);
419 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
420 mld2q->mld2q_type = ICMPV6_MGM_QUERY;
421 mld2q->mld2q_code = 0;
422 mld2q->mld2q_cksum = 0;
423 mld2q->mld2q_resv1 = 0;
424 mld2q->mld2q_resv2 = 0;
425 mld2q->mld2q_suppress = 0;
426 mld2q->mld2q_qrv = 2;
427 mld2q->mld2q_nsrcs = 0;
428 mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
429 mld2q->mld2q_mca = *grp;
430 mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
431 sizeof(*mld2q),
432 IPPROTO_ICMPV6,
433 csum_partial(mld2q,
434 sizeof(*mld2q),
435 0));
436 break;
437 }
438 skb_put(skb, mld_hdr_size);
439
440 __skb_pull(skb, sizeof(*eth));
441
442 out:
443 return skb;
444 }
445 #endif
446
447 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
448 struct br_ip *addr,
449 u8 *igmp_type)
450 {
451 switch (addr->proto) {
452 case htons(ETH_P_IP):
453 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
454 #if IS_ENABLED(CONFIG_IPV6)
455 case htons(ETH_P_IPV6):
456 return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
457 igmp_type);
458 #endif
459 }
460 return NULL;
461 }
462
463 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
464 struct br_ip *group)
465 {
466 struct net_bridge_mdb_entry *mp;
467 int err;
468
469 mp = br_mdb_ip_get(br, group);
470 if (mp)
471 return mp;
472
473 if (atomic_read(&br->mdb_hash_tbl.nelems) >= br->hash_max) {
474 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false);
475 return ERR_PTR(-E2BIG);
476 }
477
478 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
479 if (unlikely(!mp))
480 return ERR_PTR(-ENOMEM);
481
482 mp->br = br;
483 mp->addr = *group;
484 timer_setup(&mp->timer, br_multicast_group_expired, 0);
485 err = rhashtable_lookup_insert_fast(&br->mdb_hash_tbl, &mp->rhnode,
486 br_mdb_rht_params);
487 if (err) {
488 kfree(mp);
489 mp = ERR_PTR(err);
490 } else {
491 hlist_add_head_rcu(&mp->mdb_node, &br->mdb_list);
492 }
493
494 return mp;
495 }
496
497 struct net_bridge_port_group *br_multicast_new_port_group(
498 struct net_bridge_port *port,
499 struct br_ip *group,
500 struct net_bridge_port_group __rcu *next,
501 unsigned char flags,
502 const unsigned char *src)
503 {
504 struct net_bridge_port_group *p;
505
506 p = kzalloc(sizeof(*p), GFP_ATOMIC);
507 if (unlikely(!p))
508 return NULL;
509
510 p->addr = *group;
511 p->port = port;
512 p->flags = flags;
513 rcu_assign_pointer(p->next, next);
514 hlist_add_head(&p->mglist, &port->mglist);
515 timer_setup(&p->timer, br_multicast_port_group_expired, 0);
516
517 if (src)
518 memcpy(p->eth_addr, src, ETH_ALEN);
519 else
520 memset(p->eth_addr, 0xff, ETH_ALEN);
521
522 return p;
523 }
524
525 static bool br_port_group_equal(struct net_bridge_port_group *p,
526 struct net_bridge_port *port,
527 const unsigned char *src)
528 {
529 if (p->port != port)
530 return false;
531
532 if (!(port->flags & BR_MULTICAST_TO_UNICAST))
533 return true;
534
535 return ether_addr_equal(src, p->eth_addr);
536 }
537
538 static int br_multicast_add_group(struct net_bridge *br,
539 struct net_bridge_port *port,
540 struct br_ip *group,
541 const unsigned char *src)
542 {
543 struct net_bridge_port_group __rcu **pp;
544 struct net_bridge_port_group *p;
545 struct net_bridge_mdb_entry *mp;
546 unsigned long now = jiffies;
547 int err;
548
549 spin_lock(&br->multicast_lock);
550 if (!netif_running(br->dev) ||
551 (port && port->state == BR_STATE_DISABLED))
552 goto out;
553
554 mp = br_multicast_new_group(br, group);
555 err = PTR_ERR(mp);
556 if (IS_ERR(mp))
557 goto err;
558
559 if (!port) {
560 if (!mp->host_joined) {
561 mp->host_joined = true;
562 br_mdb_notify(br->dev, NULL, &mp->addr, RTM_NEWMDB, 0);
563 }
564 mod_timer(&mp->timer, now + br->multicast_membership_interval);
565 goto out;
566 }
567
568 for (pp = &mp->ports;
569 (p = mlock_dereference(*pp, br)) != NULL;
570 pp = &p->next) {
571 if (br_port_group_equal(p, port, src))
572 goto found;
573 if ((unsigned long)p->port < (unsigned long)port)
574 break;
575 }
576
577 p = br_multicast_new_port_group(port, group, *pp, 0, src);
578 if (unlikely(!p))
579 goto err;
580 rcu_assign_pointer(*pp, p);
581 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
582
583 found:
584 mod_timer(&p->timer, now + br->multicast_membership_interval);
585 out:
586 err = 0;
587
588 err:
589 spin_unlock(&br->multicast_lock);
590 return err;
591 }
592
593 static int br_ip4_multicast_add_group(struct net_bridge *br,
594 struct net_bridge_port *port,
595 __be32 group,
596 __u16 vid,
597 const unsigned char *src)
598 {
599 struct br_ip br_group;
600
601 if (ipv4_is_local_multicast(group))
602 return 0;
603
604 memset(&br_group, 0, sizeof(br_group));
605 br_group.u.ip4 = group;
606 br_group.proto = htons(ETH_P_IP);
607 br_group.vid = vid;
608
609 return br_multicast_add_group(br, port, &br_group, src);
610 }
611
612 #if IS_ENABLED(CONFIG_IPV6)
613 static int br_ip6_multicast_add_group(struct net_bridge *br,
614 struct net_bridge_port *port,
615 const struct in6_addr *group,
616 __u16 vid,
617 const unsigned char *src)
618 {
619 struct br_ip br_group;
620
621 if (ipv6_addr_is_ll_all_nodes(group))
622 return 0;
623
624 memset(&br_group, 0, sizeof(br_group));
625 br_group.u.ip6 = *group;
626 br_group.proto = htons(ETH_P_IPV6);
627 br_group.vid = vid;
628
629 return br_multicast_add_group(br, port, &br_group, src);
630 }
631 #endif
632
633 static void br_multicast_router_expired(struct timer_list *t)
634 {
635 struct net_bridge_port *port =
636 from_timer(port, t, multicast_router_timer);
637 struct net_bridge *br = port->br;
638
639 spin_lock(&br->multicast_lock);
640 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
641 port->multicast_router == MDB_RTR_TYPE_PERM ||
642 timer_pending(&port->multicast_router_timer))
643 goto out;
644
645 __del_port_router(port);
646 out:
647 spin_unlock(&br->multicast_lock);
648 }
649
650 static void br_mc_router_state_change(struct net_bridge *p,
651 bool is_mc_router)
652 {
653 struct switchdev_attr attr = {
654 .orig_dev = p->dev,
655 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
656 .flags = SWITCHDEV_F_DEFER,
657 .u.mrouter = is_mc_router,
658 };
659
660 switchdev_port_attr_set(p->dev, &attr);
661 }
662
663 static void br_multicast_local_router_expired(struct timer_list *t)
664 {
665 struct net_bridge *br = from_timer(br, t, multicast_router_timer);
666
667 spin_lock(&br->multicast_lock);
668 if (br->multicast_router == MDB_RTR_TYPE_DISABLED ||
669 br->multicast_router == MDB_RTR_TYPE_PERM ||
670 timer_pending(&br->multicast_router_timer))
671 goto out;
672
673 br_mc_router_state_change(br, false);
674 out:
675 spin_unlock(&br->multicast_lock);
676 }
677
678 static void br_multicast_querier_expired(struct net_bridge *br,
679 struct bridge_mcast_own_query *query)
680 {
681 spin_lock(&br->multicast_lock);
682 if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
683 goto out;
684
685 br_multicast_start_querier(br, query);
686
687 out:
688 spin_unlock(&br->multicast_lock);
689 }
690
691 static void br_ip4_multicast_querier_expired(struct timer_list *t)
692 {
693 struct net_bridge *br = from_timer(br, t, ip4_other_query.timer);
694
695 br_multicast_querier_expired(br, &br->ip4_own_query);
696 }
697
698 #if IS_ENABLED(CONFIG_IPV6)
699 static void br_ip6_multicast_querier_expired(struct timer_list *t)
700 {
701 struct net_bridge *br = from_timer(br, t, ip6_other_query.timer);
702
703 br_multicast_querier_expired(br, &br->ip6_own_query);
704 }
705 #endif
706
707 static void br_multicast_select_own_querier(struct net_bridge *br,
708 struct br_ip *ip,
709 struct sk_buff *skb)
710 {
711 if (ip->proto == htons(ETH_P_IP))
712 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
713 #if IS_ENABLED(CONFIG_IPV6)
714 else
715 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
716 #endif
717 }
718
719 static void __br_multicast_send_query(struct net_bridge *br,
720 struct net_bridge_port *port,
721 struct br_ip *ip)
722 {
723 struct sk_buff *skb;
724 u8 igmp_type;
725
726 skb = br_multicast_alloc_query(br, ip, &igmp_type);
727 if (!skb)
728 return;
729
730 if (port) {
731 skb->dev = port->dev;
732 br_multicast_count(br, port, skb, igmp_type,
733 BR_MCAST_DIR_TX);
734 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
735 dev_net(port->dev), NULL, skb, NULL, skb->dev,
736 br_dev_queue_push_xmit);
737 } else {
738 br_multicast_select_own_querier(br, ip, skb);
739 br_multicast_count(br, port, skb, igmp_type,
740 BR_MCAST_DIR_RX);
741 netif_rx(skb);
742 }
743 }
744
745 static void br_multicast_send_query(struct net_bridge *br,
746 struct net_bridge_port *port,
747 struct bridge_mcast_own_query *own_query)
748 {
749 struct bridge_mcast_other_query *other_query = NULL;
750 struct br_ip br_group;
751 unsigned long time;
752
753 if (!netif_running(br->dev) ||
754 !br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
755 !br_opt_get(br, BROPT_MULTICAST_QUERIER))
756 return;
757
758 memset(&br_group.u, 0, sizeof(br_group.u));
759
760 if (port ? (own_query == &port->ip4_own_query) :
761 (own_query == &br->ip4_own_query)) {
762 other_query = &br->ip4_other_query;
763 br_group.proto = htons(ETH_P_IP);
764 #if IS_ENABLED(CONFIG_IPV6)
765 } else {
766 other_query = &br->ip6_other_query;
767 br_group.proto = htons(ETH_P_IPV6);
768 #endif
769 }
770
771 if (!other_query || timer_pending(&other_query->timer))
772 return;
773
774 __br_multicast_send_query(br, port, &br_group);
775
776 time = jiffies;
777 time += own_query->startup_sent < br->multicast_startup_query_count ?
778 br->multicast_startup_query_interval :
779 br->multicast_query_interval;
780 mod_timer(&own_query->timer, time);
781 }
782
783 static void
784 br_multicast_port_query_expired(struct net_bridge_port *port,
785 struct bridge_mcast_own_query *query)
786 {
787 struct net_bridge *br = port->br;
788
789 spin_lock(&br->multicast_lock);
790 if (port->state == BR_STATE_DISABLED ||
791 port->state == BR_STATE_BLOCKING)
792 goto out;
793
794 if (query->startup_sent < br->multicast_startup_query_count)
795 query->startup_sent++;
796
797 br_multicast_send_query(port->br, port, query);
798
799 out:
800 spin_unlock(&br->multicast_lock);
801 }
802
803 static void br_ip4_multicast_port_query_expired(struct timer_list *t)
804 {
805 struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer);
806
807 br_multicast_port_query_expired(port, &port->ip4_own_query);
808 }
809
810 #if IS_ENABLED(CONFIG_IPV6)
811 static void br_ip6_multicast_port_query_expired(struct timer_list *t)
812 {
813 struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer);
814
815 br_multicast_port_query_expired(port, &port->ip6_own_query);
816 }
817 #endif
818
819 static void br_mc_disabled_update(struct net_device *dev, bool value)
820 {
821 struct switchdev_attr attr = {
822 .orig_dev = dev,
823 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
824 .flags = SWITCHDEV_F_DEFER,
825 .u.mc_disabled = !value,
826 };
827
828 switchdev_port_attr_set(dev, &attr);
829 }
830
831 int br_multicast_add_port(struct net_bridge_port *port)
832 {
833 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
834
835 timer_setup(&port->multicast_router_timer,
836 br_multicast_router_expired, 0);
837 timer_setup(&port->ip4_own_query.timer,
838 br_ip4_multicast_port_query_expired, 0);
839 #if IS_ENABLED(CONFIG_IPV6)
840 timer_setup(&port->ip6_own_query.timer,
841 br_ip6_multicast_port_query_expired, 0);
842 #endif
843 br_mc_disabled_update(port->dev,
844 br_opt_get(port->br, BROPT_MULTICAST_ENABLED));
845
846 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
847 if (!port->mcast_stats)
848 return -ENOMEM;
849
850 return 0;
851 }
852
853 void br_multicast_del_port(struct net_bridge_port *port)
854 {
855 struct net_bridge *br = port->br;
856 struct net_bridge_port_group *pg;
857 struct hlist_node *n;
858
859 /* Take care of the remaining groups, only perm ones should be left */
860 spin_lock_bh(&br->multicast_lock);
861 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
862 br_multicast_del_pg(br, pg);
863 spin_unlock_bh(&br->multicast_lock);
864 del_timer_sync(&port->multicast_router_timer);
865 free_percpu(port->mcast_stats);
866 }
867
868 static void br_multicast_enable(struct bridge_mcast_own_query *query)
869 {
870 query->startup_sent = 0;
871
872 if (try_to_del_timer_sync(&query->timer) >= 0 ||
873 del_timer(&query->timer))
874 mod_timer(&query->timer, jiffies);
875 }
876
877 static void __br_multicast_enable_port(struct net_bridge_port *port)
878 {
879 struct net_bridge *br = port->br;
880
881 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || !netif_running(br->dev))
882 return;
883
884 br_multicast_enable(&port->ip4_own_query);
885 #if IS_ENABLED(CONFIG_IPV6)
886 br_multicast_enable(&port->ip6_own_query);
887 #endif
888 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
889 hlist_unhashed(&port->rlist))
890 br_multicast_add_router(br, port);
891 }
892
893 void br_multicast_enable_port(struct net_bridge_port *port)
894 {
895 struct net_bridge *br = port->br;
896
897 spin_lock(&br->multicast_lock);
898 __br_multicast_enable_port(port);
899 spin_unlock(&br->multicast_lock);
900 }
901
902 void br_multicast_disable_port(struct net_bridge_port *port)
903 {
904 struct net_bridge *br = port->br;
905 struct net_bridge_port_group *pg;
906 struct hlist_node *n;
907
908 spin_lock(&br->multicast_lock);
909 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
910 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
911 br_multicast_del_pg(br, pg);
912
913 __del_port_router(port);
914
915 del_timer(&port->multicast_router_timer);
916 del_timer(&port->ip4_own_query.timer);
917 #if IS_ENABLED(CONFIG_IPV6)
918 del_timer(&port->ip6_own_query.timer);
919 #endif
920 spin_unlock(&br->multicast_lock);
921 }
922
923 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
924 struct net_bridge_port *port,
925 struct sk_buff *skb,
926 u16 vid)
927 {
928 const unsigned char *src;
929 struct igmpv3_report *ih;
930 struct igmpv3_grec *grec;
931 int i;
932 int len;
933 int num;
934 int type;
935 int err = 0;
936 __be32 group;
937
938 ih = igmpv3_report_hdr(skb);
939 num = ntohs(ih->ngrec);
940 len = skb_transport_offset(skb) + sizeof(*ih);
941
942 for (i = 0; i < num; i++) {
943 len += sizeof(*grec);
944 if (!ip_mc_may_pull(skb, len))
945 return -EINVAL;
946
947 grec = (void *)(skb->data + len - sizeof(*grec));
948 group = grec->grec_mca;
949 type = grec->grec_type;
950
951 len += ntohs(grec->grec_nsrcs) * 4;
952 if (!ip_mc_may_pull(skb, len))
953 return -EINVAL;
954
955 /* We treat this as an IGMPv2 report for now. */
956 switch (type) {
957 case IGMPV3_MODE_IS_INCLUDE:
958 case IGMPV3_MODE_IS_EXCLUDE:
959 case IGMPV3_CHANGE_TO_INCLUDE:
960 case IGMPV3_CHANGE_TO_EXCLUDE:
961 case IGMPV3_ALLOW_NEW_SOURCES:
962 case IGMPV3_BLOCK_OLD_SOURCES:
963 break;
964
965 default:
966 continue;
967 }
968
969 src = eth_hdr(skb)->h_source;
970 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
971 type == IGMPV3_MODE_IS_INCLUDE) &&
972 ntohs(grec->grec_nsrcs) == 0) {
973 br_ip4_multicast_leave_group(br, port, group, vid, src);
974 } else {
975 err = br_ip4_multicast_add_group(br, port, group, vid,
976 src);
977 if (err)
978 break;
979 }
980 }
981
982 return err;
983 }
984
985 #if IS_ENABLED(CONFIG_IPV6)
986 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
987 struct net_bridge_port *port,
988 struct sk_buff *skb,
989 u16 vid)
990 {
991 unsigned int nsrcs_offset;
992 const unsigned char *src;
993 struct icmp6hdr *icmp6h;
994 struct mld2_grec *grec;
995 unsigned int grec_len;
996 int i;
997 int len;
998 int num;
999 int err = 0;
1000
1001 if (!ipv6_mc_may_pull(skb, sizeof(*icmp6h)))
1002 return -EINVAL;
1003
1004 icmp6h = icmp6_hdr(skb);
1005 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1006 len = skb_transport_offset(skb) + sizeof(*icmp6h);
1007
1008 for (i = 0; i < num; i++) {
1009 __be16 *nsrcs, _nsrcs;
1010
1011 nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs);
1012
1013 if (skb_transport_offset(skb) + ipv6_transport_len(skb) <
1014 nsrcs_offset + sizeof(_nsrcs))
1015 return -EINVAL;
1016
1017 nsrcs = skb_header_pointer(skb, nsrcs_offset,
1018 sizeof(_nsrcs), &_nsrcs);
1019 if (!nsrcs)
1020 return -EINVAL;
1021
1022 grec_len = struct_size(grec, grec_src, ntohs(*nsrcs));
1023
1024 if (!ipv6_mc_may_pull(skb, len + grec_len))
1025 return -EINVAL;
1026
1027 grec = (struct mld2_grec *)(skb->data + len);
1028 len += grec_len;
1029
1030 /* We treat these as MLDv1 reports for now. */
1031 switch (grec->grec_type) {
1032 case MLD2_MODE_IS_INCLUDE:
1033 case MLD2_MODE_IS_EXCLUDE:
1034 case MLD2_CHANGE_TO_INCLUDE:
1035 case MLD2_CHANGE_TO_EXCLUDE:
1036 case MLD2_ALLOW_NEW_SOURCES:
1037 case MLD2_BLOCK_OLD_SOURCES:
1038 break;
1039
1040 default:
1041 continue;
1042 }
1043
1044 src = eth_hdr(skb)->h_source;
1045 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1046 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1047 ntohs(*nsrcs) == 0) {
1048 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1049 vid, src);
1050 } else {
1051 err = br_ip6_multicast_add_group(br, port,
1052 &grec->grec_mca, vid,
1053 src);
1054 if (err)
1055 break;
1056 }
1057 }
1058
1059 return err;
1060 }
1061 #endif
1062
1063 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1064 struct net_bridge_port *port,
1065 __be32 saddr)
1066 {
1067 if (!timer_pending(&br->ip4_own_query.timer) &&
1068 !timer_pending(&br->ip4_other_query.timer))
1069 goto update;
1070
1071 if (!br->ip4_querier.addr.u.ip4)
1072 goto update;
1073
1074 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1075 goto update;
1076
1077 return false;
1078
1079 update:
1080 br->ip4_querier.addr.u.ip4 = saddr;
1081
1082 /* update protected by general multicast_lock by caller */
1083 rcu_assign_pointer(br->ip4_querier.port, port);
1084
1085 return true;
1086 }
1087
1088 #if IS_ENABLED(CONFIG_IPV6)
1089 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1090 struct net_bridge_port *port,
1091 struct in6_addr *saddr)
1092 {
1093 if (!timer_pending(&br->ip6_own_query.timer) &&
1094 !timer_pending(&br->ip6_other_query.timer))
1095 goto update;
1096
1097 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1098 goto update;
1099
1100 return false;
1101
1102 update:
1103 br->ip6_querier.addr.u.ip6 = *saddr;
1104
1105 /* update protected by general multicast_lock by caller */
1106 rcu_assign_pointer(br->ip6_querier.port, port);
1107
1108 return true;
1109 }
1110 #endif
1111
1112 static bool br_multicast_select_querier(struct net_bridge *br,
1113 struct net_bridge_port *port,
1114 struct br_ip *saddr)
1115 {
1116 switch (saddr->proto) {
1117 case htons(ETH_P_IP):
1118 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1119 #if IS_ENABLED(CONFIG_IPV6)
1120 case htons(ETH_P_IPV6):
1121 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1122 #endif
1123 }
1124
1125 return false;
1126 }
1127
1128 static void
1129 br_multicast_update_query_timer(struct net_bridge *br,
1130 struct bridge_mcast_other_query *query,
1131 unsigned long max_delay)
1132 {
1133 if (!timer_pending(&query->timer))
1134 query->delay_time = jiffies + max_delay;
1135
1136 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1137 }
1138
1139 static void br_port_mc_router_state_change(struct net_bridge_port *p,
1140 bool is_mc_router)
1141 {
1142 struct switchdev_attr attr = {
1143 .orig_dev = p->dev,
1144 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
1145 .flags = SWITCHDEV_F_DEFER,
1146 .u.mrouter = is_mc_router,
1147 };
1148
1149 switchdev_port_attr_set(p->dev, &attr);
1150 }
1151
1152 /*
1153 * Add port to router_list
1154 * list is maintained ordered by pointer value
1155 * and locked by br->multicast_lock and RCU
1156 */
1157 static void br_multicast_add_router(struct net_bridge *br,
1158 struct net_bridge_port *port)
1159 {
1160 struct net_bridge_port *p;
1161 struct hlist_node *slot = NULL;
1162
1163 if (!hlist_unhashed(&port->rlist))
1164 return;
1165
1166 hlist_for_each_entry(p, &br->router_list, rlist) {
1167 if ((unsigned long) port >= (unsigned long) p)
1168 break;
1169 slot = &p->rlist;
1170 }
1171
1172 if (slot)
1173 hlist_add_behind_rcu(&port->rlist, slot);
1174 else
1175 hlist_add_head_rcu(&port->rlist, &br->router_list);
1176 br_rtr_notify(br->dev, port, RTM_NEWMDB);
1177 br_port_mc_router_state_change(port, true);
1178 }
1179
1180 static void br_multicast_mark_router(struct net_bridge *br,
1181 struct net_bridge_port *port)
1182 {
1183 unsigned long now = jiffies;
1184
1185 if (!port) {
1186 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
1187 if (!timer_pending(&br->multicast_router_timer))
1188 br_mc_router_state_change(br, true);
1189 mod_timer(&br->multicast_router_timer,
1190 now + br->multicast_querier_interval);
1191 }
1192 return;
1193 }
1194
1195 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1196 port->multicast_router == MDB_RTR_TYPE_PERM)
1197 return;
1198
1199 br_multicast_add_router(br, port);
1200
1201 mod_timer(&port->multicast_router_timer,
1202 now + br->multicast_querier_interval);
1203 }
1204
1205 static void br_multicast_query_received(struct net_bridge *br,
1206 struct net_bridge_port *port,
1207 struct bridge_mcast_other_query *query,
1208 struct br_ip *saddr,
1209 unsigned long max_delay)
1210 {
1211 if (!br_multicast_select_querier(br, port, saddr))
1212 return;
1213
1214 br_multicast_update_query_timer(br, query, max_delay);
1215 br_multicast_mark_router(br, port);
1216 }
1217
1218 static void br_ip4_multicast_query(struct net_bridge *br,
1219 struct net_bridge_port *port,
1220 struct sk_buff *skb,
1221 u16 vid)
1222 {
1223 unsigned int transport_len = ip_transport_len(skb);
1224 const struct iphdr *iph = ip_hdr(skb);
1225 struct igmphdr *ih = igmp_hdr(skb);
1226 struct net_bridge_mdb_entry *mp;
1227 struct igmpv3_query *ih3;
1228 struct net_bridge_port_group *p;
1229 struct net_bridge_port_group __rcu **pp;
1230 struct br_ip saddr;
1231 unsigned long max_delay;
1232 unsigned long now = jiffies;
1233 __be32 group;
1234
1235 spin_lock(&br->multicast_lock);
1236 if (!netif_running(br->dev) ||
1237 (port && port->state == BR_STATE_DISABLED))
1238 goto out;
1239
1240 group = ih->group;
1241
1242 if (transport_len == sizeof(*ih)) {
1243 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1244
1245 if (!max_delay) {
1246 max_delay = 10 * HZ;
1247 group = 0;
1248 }
1249 } else if (transport_len >= sizeof(*ih3)) {
1250 ih3 = igmpv3_query_hdr(skb);
1251 if (ih3->nsrcs)
1252 goto out;
1253
1254 max_delay = ih3->code ?
1255 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1256 } else {
1257 goto out;
1258 }
1259
1260 if (!group) {
1261 saddr.proto = htons(ETH_P_IP);
1262 saddr.u.ip4 = iph->saddr;
1263
1264 br_multicast_query_received(br, port, &br->ip4_other_query,
1265 &saddr, max_delay);
1266 goto out;
1267 }
1268
1269 mp = br_mdb_ip4_get(br, group, vid);
1270 if (!mp)
1271 goto out;
1272
1273 max_delay *= br->multicast_last_member_count;
1274
1275 if (mp->host_joined &&
1276 (timer_pending(&mp->timer) ?
1277 time_after(mp->timer.expires, now + max_delay) :
1278 try_to_del_timer_sync(&mp->timer) >= 0))
1279 mod_timer(&mp->timer, now + max_delay);
1280
1281 for (pp = &mp->ports;
1282 (p = mlock_dereference(*pp, br)) != NULL;
1283 pp = &p->next) {
1284 if (timer_pending(&p->timer) ?
1285 time_after(p->timer.expires, now + max_delay) :
1286 try_to_del_timer_sync(&p->timer) >= 0)
1287 mod_timer(&p->timer, now + max_delay);
1288 }
1289
1290 out:
1291 spin_unlock(&br->multicast_lock);
1292 }
1293
1294 #if IS_ENABLED(CONFIG_IPV6)
1295 static int br_ip6_multicast_query(struct net_bridge *br,
1296 struct net_bridge_port *port,
1297 struct sk_buff *skb,
1298 u16 vid)
1299 {
1300 unsigned int transport_len = ipv6_transport_len(skb);
1301 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1302 struct mld_msg *mld;
1303 struct net_bridge_mdb_entry *mp;
1304 struct mld2_query *mld2q;
1305 struct net_bridge_port_group *p;
1306 struct net_bridge_port_group __rcu **pp;
1307 struct br_ip saddr;
1308 unsigned long max_delay;
1309 unsigned long now = jiffies;
1310 unsigned int offset = skb_transport_offset(skb);
1311 const struct in6_addr *group = NULL;
1312 bool is_general_query;
1313 int err = 0;
1314
1315 spin_lock(&br->multicast_lock);
1316 if (!netif_running(br->dev) ||
1317 (port && port->state == BR_STATE_DISABLED))
1318 goto out;
1319
1320 if (transport_len == sizeof(*mld)) {
1321 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1322 err = -EINVAL;
1323 goto out;
1324 }
1325 mld = (struct mld_msg *) icmp6_hdr(skb);
1326 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1327 if (max_delay)
1328 group = &mld->mld_mca;
1329 } else {
1330 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1331 err = -EINVAL;
1332 goto out;
1333 }
1334 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1335 if (!mld2q->mld2q_nsrcs)
1336 group = &mld2q->mld2q_mca;
1337
1338 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1339 }
1340
1341 is_general_query = group && ipv6_addr_any(group);
1342
1343 if (is_general_query) {
1344 saddr.proto = htons(ETH_P_IPV6);
1345 saddr.u.ip6 = ip6h->saddr;
1346
1347 br_multicast_query_received(br, port, &br->ip6_other_query,
1348 &saddr, max_delay);
1349 goto out;
1350 } else if (!group) {
1351 goto out;
1352 }
1353
1354 mp = br_mdb_ip6_get(br, group, vid);
1355 if (!mp)
1356 goto out;
1357
1358 max_delay *= br->multicast_last_member_count;
1359 if (mp->host_joined &&
1360 (timer_pending(&mp->timer) ?
1361 time_after(mp->timer.expires, now + max_delay) :
1362 try_to_del_timer_sync(&mp->timer) >= 0))
1363 mod_timer(&mp->timer, now + max_delay);
1364
1365 for (pp = &mp->ports;
1366 (p = mlock_dereference(*pp, br)) != NULL;
1367 pp = &p->next) {
1368 if (timer_pending(&p->timer) ?
1369 time_after(p->timer.expires, now + max_delay) :
1370 try_to_del_timer_sync(&p->timer) >= 0)
1371 mod_timer(&p->timer, now + max_delay);
1372 }
1373
1374 out:
1375 spin_unlock(&br->multicast_lock);
1376 return err;
1377 }
1378 #endif
1379
1380 static void
1381 br_multicast_leave_group(struct net_bridge *br,
1382 struct net_bridge_port *port,
1383 struct br_ip *group,
1384 struct bridge_mcast_other_query *other_query,
1385 struct bridge_mcast_own_query *own_query,
1386 const unsigned char *src)
1387 {
1388 struct net_bridge_mdb_entry *mp;
1389 struct net_bridge_port_group *p;
1390 unsigned long now;
1391 unsigned long time;
1392
1393 spin_lock(&br->multicast_lock);
1394 if (!netif_running(br->dev) ||
1395 (port && port->state == BR_STATE_DISABLED))
1396 goto out;
1397
1398 mp = br_mdb_ip_get(br, group);
1399 if (!mp)
1400 goto out;
1401
1402 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1403 struct net_bridge_port_group __rcu **pp;
1404
1405 for (pp = &mp->ports;
1406 (p = mlock_dereference(*pp, br)) != NULL;
1407 pp = &p->next) {
1408 if (!br_port_group_equal(p, port, src))
1409 continue;
1410
1411 rcu_assign_pointer(*pp, p->next);
1412 hlist_del_init(&p->mglist);
1413 del_timer(&p->timer);
1414 kfree_rcu(p, rcu);
1415 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1416 p->flags);
1417
1418 if (!mp->ports && !mp->host_joined &&
1419 netif_running(br->dev))
1420 mod_timer(&mp->timer, jiffies);
1421 }
1422 goto out;
1423 }
1424
1425 if (timer_pending(&other_query->timer))
1426 goto out;
1427
1428 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
1429 __br_multicast_send_query(br, port, &mp->addr);
1430
1431 time = jiffies + br->multicast_last_member_count *
1432 br->multicast_last_member_interval;
1433
1434 mod_timer(&own_query->timer, time);
1435
1436 for (p = mlock_dereference(mp->ports, br);
1437 p != NULL;
1438 p = mlock_dereference(p->next, br)) {
1439 if (!br_port_group_equal(p, port, src))
1440 continue;
1441
1442 if (!hlist_unhashed(&p->mglist) &&
1443 (timer_pending(&p->timer) ?
1444 time_after(p->timer.expires, time) :
1445 try_to_del_timer_sync(&p->timer) >= 0)) {
1446 mod_timer(&p->timer, time);
1447 }
1448
1449 break;
1450 }
1451 }
1452
1453 now = jiffies;
1454 time = now + br->multicast_last_member_count *
1455 br->multicast_last_member_interval;
1456
1457 if (!port) {
1458 if (mp->host_joined &&
1459 (timer_pending(&mp->timer) ?
1460 time_after(mp->timer.expires, time) :
1461 try_to_del_timer_sync(&mp->timer) >= 0)) {
1462 mod_timer(&mp->timer, time);
1463 }
1464
1465 goto out;
1466 }
1467
1468 for (p = mlock_dereference(mp->ports, br);
1469 p != NULL;
1470 p = mlock_dereference(p->next, br)) {
1471 if (p->port != port)
1472 continue;
1473
1474 if (!hlist_unhashed(&p->mglist) &&
1475 (timer_pending(&p->timer) ?
1476 time_after(p->timer.expires, time) :
1477 try_to_del_timer_sync(&p->timer) >= 0)) {
1478 mod_timer(&p->timer, time);
1479 }
1480
1481 break;
1482 }
1483 out:
1484 spin_unlock(&br->multicast_lock);
1485 }
1486
1487 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1488 struct net_bridge_port *port,
1489 __be32 group,
1490 __u16 vid,
1491 const unsigned char *src)
1492 {
1493 struct br_ip br_group;
1494 struct bridge_mcast_own_query *own_query;
1495
1496 if (ipv4_is_local_multicast(group))
1497 return;
1498
1499 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1500
1501 memset(&br_group, 0, sizeof(br_group));
1502 br_group.u.ip4 = group;
1503 br_group.proto = htons(ETH_P_IP);
1504 br_group.vid = vid;
1505
1506 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1507 own_query, src);
1508 }
1509
1510 #if IS_ENABLED(CONFIG_IPV6)
1511 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1512 struct net_bridge_port *port,
1513 const struct in6_addr *group,
1514 __u16 vid,
1515 const unsigned char *src)
1516 {
1517 struct br_ip br_group;
1518 struct bridge_mcast_own_query *own_query;
1519
1520 if (ipv6_addr_is_ll_all_nodes(group))
1521 return;
1522
1523 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1524
1525 memset(&br_group, 0, sizeof(br_group));
1526 br_group.u.ip6 = *group;
1527 br_group.proto = htons(ETH_P_IPV6);
1528 br_group.vid = vid;
1529
1530 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1531 own_query, src);
1532 }
1533 #endif
1534
1535 static void br_multicast_err_count(const struct net_bridge *br,
1536 const struct net_bridge_port *p,
1537 __be16 proto)
1538 {
1539 struct bridge_mcast_stats __percpu *stats;
1540 struct bridge_mcast_stats *pstats;
1541
1542 if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
1543 return;
1544
1545 if (p)
1546 stats = p->mcast_stats;
1547 else
1548 stats = br->mcast_stats;
1549 if (WARN_ON(!stats))
1550 return;
1551
1552 pstats = this_cpu_ptr(stats);
1553
1554 u64_stats_update_begin(&pstats->syncp);
1555 switch (proto) {
1556 case htons(ETH_P_IP):
1557 pstats->mstats.igmp_parse_errors++;
1558 break;
1559 #if IS_ENABLED(CONFIG_IPV6)
1560 case htons(ETH_P_IPV6):
1561 pstats->mstats.mld_parse_errors++;
1562 break;
1563 #endif
1564 }
1565 u64_stats_update_end(&pstats->syncp);
1566 }
1567
1568 static void br_multicast_pim(struct net_bridge *br,
1569 struct net_bridge_port *port,
1570 const struct sk_buff *skb)
1571 {
1572 unsigned int offset = skb_transport_offset(skb);
1573 struct pimhdr *pimhdr, _pimhdr;
1574
1575 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1576 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1577 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1578 return;
1579
1580 br_multicast_mark_router(br, port);
1581 }
1582
1583 static int br_ip4_multicast_mrd_rcv(struct net_bridge *br,
1584 struct net_bridge_port *port,
1585 struct sk_buff *skb)
1586 {
1587 if (ip_hdr(skb)->protocol != IPPROTO_IGMP ||
1588 igmp_hdr(skb)->type != IGMP_MRDISC_ADV)
1589 return -ENOMSG;
1590
1591 br_multicast_mark_router(br, port);
1592
1593 return 0;
1594 }
1595
1596 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1597 struct net_bridge_port *port,
1598 struct sk_buff *skb,
1599 u16 vid)
1600 {
1601 const unsigned char *src;
1602 struct igmphdr *ih;
1603 int err;
1604
1605 err = ip_mc_check_igmp(skb);
1606
1607 if (err == -ENOMSG) {
1608 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
1609 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1610 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1611 if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1612 br_multicast_pim(br, port, skb);
1613 } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) {
1614 br_ip4_multicast_mrd_rcv(br, port, skb);
1615 }
1616
1617 return 0;
1618 } else if (err < 0) {
1619 br_multicast_err_count(br, port, skb->protocol);
1620 return err;
1621 }
1622
1623 ih = igmp_hdr(skb);
1624 src = eth_hdr(skb)->h_source;
1625 BR_INPUT_SKB_CB(skb)->igmp = ih->type;
1626
1627 switch (ih->type) {
1628 case IGMP_HOST_MEMBERSHIP_REPORT:
1629 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1630 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1631 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
1632 break;
1633 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1634 err = br_ip4_multicast_igmp3_report(br, port, skb, vid);
1635 break;
1636 case IGMP_HOST_MEMBERSHIP_QUERY:
1637 br_ip4_multicast_query(br, port, skb, vid);
1638 break;
1639 case IGMP_HOST_LEAVE_MESSAGE:
1640 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
1641 break;
1642 }
1643
1644 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1645 BR_MCAST_DIR_RX);
1646
1647 return err;
1648 }
1649
1650 #if IS_ENABLED(CONFIG_IPV6)
1651 static int br_ip6_multicast_mrd_rcv(struct net_bridge *br,
1652 struct net_bridge_port *port,
1653 struct sk_buff *skb)
1654 {
1655 int ret;
1656
1657 if (ipv6_hdr(skb)->nexthdr != IPPROTO_ICMPV6)
1658 return -ENOMSG;
1659
1660 ret = ipv6_mc_check_icmpv6(skb);
1661 if (ret < 0)
1662 return ret;
1663
1664 if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV)
1665 return -ENOMSG;
1666
1667 br_multicast_mark_router(br, port);
1668
1669 return 0;
1670 }
1671
1672 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1673 struct net_bridge_port *port,
1674 struct sk_buff *skb,
1675 u16 vid)
1676 {
1677 const unsigned char *src;
1678 struct mld_msg *mld;
1679 int err;
1680
1681 err = ipv6_mc_check_mld(skb);
1682
1683 if (err == -ENOMSG) {
1684 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1685 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1686
1687 if (ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr)) {
1688 err = br_ip6_multicast_mrd_rcv(br, port, skb);
1689
1690 if (err < 0 && err != -ENOMSG) {
1691 br_multicast_err_count(br, port, skb->protocol);
1692 return err;
1693 }
1694 }
1695
1696 return 0;
1697 } else if (err < 0) {
1698 br_multicast_err_count(br, port, skb->protocol);
1699 return err;
1700 }
1701
1702 mld = (struct mld_msg *)skb_transport_header(skb);
1703 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
1704
1705 switch (mld->mld_type) {
1706 case ICMPV6_MGM_REPORT:
1707 src = eth_hdr(skb)->h_source;
1708 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1709 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
1710 src);
1711 break;
1712 case ICMPV6_MLD2_REPORT:
1713 err = br_ip6_multicast_mld2_report(br, port, skb, vid);
1714 break;
1715 case ICMPV6_MGM_QUERY:
1716 err = br_ip6_multicast_query(br, port, skb, vid);
1717 break;
1718 case ICMPV6_MGM_REDUCTION:
1719 src = eth_hdr(skb)->h_source;
1720 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
1721 break;
1722 }
1723
1724 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1725 BR_MCAST_DIR_RX);
1726
1727 return err;
1728 }
1729 #endif
1730
1731 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1732 struct sk_buff *skb, u16 vid)
1733 {
1734 int ret = 0;
1735
1736 BR_INPUT_SKB_CB(skb)->igmp = 0;
1737 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1738
1739 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
1740 return 0;
1741
1742 switch (skb->protocol) {
1743 case htons(ETH_P_IP):
1744 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1745 break;
1746 #if IS_ENABLED(CONFIG_IPV6)
1747 case htons(ETH_P_IPV6):
1748 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1749 break;
1750 #endif
1751 }
1752
1753 return ret;
1754 }
1755
1756 static void br_multicast_query_expired(struct net_bridge *br,
1757 struct bridge_mcast_own_query *query,
1758 struct bridge_mcast_querier *querier)
1759 {
1760 spin_lock(&br->multicast_lock);
1761 if (query->startup_sent < br->multicast_startup_query_count)
1762 query->startup_sent++;
1763
1764 RCU_INIT_POINTER(querier->port, NULL);
1765 br_multicast_send_query(br, NULL, query);
1766 spin_unlock(&br->multicast_lock);
1767 }
1768
1769 static void br_ip4_multicast_query_expired(struct timer_list *t)
1770 {
1771 struct net_bridge *br = from_timer(br, t, ip4_own_query.timer);
1772
1773 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1774 }
1775
1776 #if IS_ENABLED(CONFIG_IPV6)
1777 static void br_ip6_multicast_query_expired(struct timer_list *t)
1778 {
1779 struct net_bridge *br = from_timer(br, t, ip6_own_query.timer);
1780
1781 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1782 }
1783 #endif
1784
1785 void br_multicast_init(struct net_bridge *br)
1786 {
1787 br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX;
1788
1789 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1790 br->multicast_last_member_count = 2;
1791 br->multicast_startup_query_count = 2;
1792
1793 br->multicast_last_member_interval = HZ;
1794 br->multicast_query_response_interval = 10 * HZ;
1795 br->multicast_startup_query_interval = 125 * HZ / 4;
1796 br->multicast_query_interval = 125 * HZ;
1797 br->multicast_querier_interval = 255 * HZ;
1798 br->multicast_membership_interval = 260 * HZ;
1799
1800 br->ip4_other_query.delay_time = 0;
1801 br->ip4_querier.port = NULL;
1802 br->multicast_igmp_version = 2;
1803 #if IS_ENABLED(CONFIG_IPV6)
1804 br->multicast_mld_version = 1;
1805 br->ip6_other_query.delay_time = 0;
1806 br->ip6_querier.port = NULL;
1807 #endif
1808 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true);
1809 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
1810
1811 spin_lock_init(&br->multicast_lock);
1812 timer_setup(&br->multicast_router_timer,
1813 br_multicast_local_router_expired, 0);
1814 timer_setup(&br->ip4_other_query.timer,
1815 br_ip4_multicast_querier_expired, 0);
1816 timer_setup(&br->ip4_own_query.timer,
1817 br_ip4_multicast_query_expired, 0);
1818 #if IS_ENABLED(CONFIG_IPV6)
1819 timer_setup(&br->ip6_other_query.timer,
1820 br_ip6_multicast_querier_expired, 0);
1821 timer_setup(&br->ip6_own_query.timer,
1822 br_ip6_multicast_query_expired, 0);
1823 #endif
1824 INIT_HLIST_HEAD(&br->mdb_list);
1825 }
1826
1827 static void br_ip4_multicast_join_snoopers(struct net_bridge *br)
1828 {
1829 struct in_device *in_dev = in_dev_get(br->dev);
1830
1831 if (!in_dev)
1832 return;
1833
1834 __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
1835 in_dev_put(in_dev);
1836 }
1837
1838 #if IS_ENABLED(CONFIG_IPV6)
1839 static void br_ip6_multicast_join_snoopers(struct net_bridge *br)
1840 {
1841 struct in6_addr addr;
1842
1843 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
1844 ipv6_dev_mc_inc(br->dev, &addr);
1845 }
1846 #else
1847 static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br)
1848 {
1849 }
1850 #endif
1851
1852 static void br_multicast_join_snoopers(struct net_bridge *br)
1853 {
1854 br_ip4_multicast_join_snoopers(br);
1855 br_ip6_multicast_join_snoopers(br);
1856 }
1857
1858 static void br_ip4_multicast_leave_snoopers(struct net_bridge *br)
1859 {
1860 struct in_device *in_dev = in_dev_get(br->dev);
1861
1862 if (WARN_ON(!in_dev))
1863 return;
1864
1865 __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
1866 in_dev_put(in_dev);
1867 }
1868
1869 #if IS_ENABLED(CONFIG_IPV6)
1870 static void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
1871 {
1872 struct in6_addr addr;
1873
1874 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
1875 ipv6_dev_mc_dec(br->dev, &addr);
1876 }
1877 #else
1878 static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
1879 {
1880 }
1881 #endif
1882
1883 static void br_multicast_leave_snoopers(struct net_bridge *br)
1884 {
1885 br_ip4_multicast_leave_snoopers(br);
1886 br_ip6_multicast_leave_snoopers(br);
1887 }
1888
1889 static void __br_multicast_open(struct net_bridge *br,
1890 struct bridge_mcast_own_query *query)
1891 {
1892 query->startup_sent = 0;
1893
1894 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
1895 return;
1896
1897 mod_timer(&query->timer, jiffies);
1898 }
1899
1900 void br_multicast_open(struct net_bridge *br)
1901 {
1902 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
1903 br_multicast_join_snoopers(br);
1904
1905 __br_multicast_open(br, &br->ip4_own_query);
1906 #if IS_ENABLED(CONFIG_IPV6)
1907 __br_multicast_open(br, &br->ip6_own_query);
1908 #endif
1909 }
1910
1911 void br_multicast_stop(struct net_bridge *br)
1912 {
1913 del_timer_sync(&br->multicast_router_timer);
1914 del_timer_sync(&br->ip4_other_query.timer);
1915 del_timer_sync(&br->ip4_own_query.timer);
1916 #if IS_ENABLED(CONFIG_IPV6)
1917 del_timer_sync(&br->ip6_other_query.timer);
1918 del_timer_sync(&br->ip6_own_query.timer);
1919 #endif
1920
1921 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
1922 br_multicast_leave_snoopers(br);
1923 }
1924
1925 void br_multicast_dev_del(struct net_bridge *br)
1926 {
1927 struct net_bridge_mdb_entry *mp;
1928 struct hlist_node *tmp;
1929
1930 spin_lock_bh(&br->multicast_lock);
1931 hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node) {
1932 del_timer(&mp->timer);
1933 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
1934 br_mdb_rht_params);
1935 hlist_del_rcu(&mp->mdb_node);
1936 kfree_rcu(mp, rcu);
1937 }
1938 spin_unlock_bh(&br->multicast_lock);
1939
1940 rcu_barrier();
1941 }
1942
1943 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1944 {
1945 int err = -EINVAL;
1946
1947 spin_lock_bh(&br->multicast_lock);
1948
1949 switch (val) {
1950 case MDB_RTR_TYPE_DISABLED:
1951 case MDB_RTR_TYPE_PERM:
1952 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM);
1953 del_timer(&br->multicast_router_timer);
1954 br->multicast_router = val;
1955 err = 0;
1956 break;
1957 case MDB_RTR_TYPE_TEMP_QUERY:
1958 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
1959 br_mc_router_state_change(br, false);
1960 br->multicast_router = val;
1961 err = 0;
1962 break;
1963 }
1964
1965 spin_unlock_bh(&br->multicast_lock);
1966
1967 return err;
1968 }
1969
1970 static void __del_port_router(struct net_bridge_port *p)
1971 {
1972 if (hlist_unhashed(&p->rlist))
1973 return;
1974 hlist_del_init_rcu(&p->rlist);
1975 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
1976 br_port_mc_router_state_change(p, false);
1977
1978 /* don't allow timer refresh */
1979 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1980 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1981 }
1982
1983 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1984 {
1985 struct net_bridge *br = p->br;
1986 unsigned long now = jiffies;
1987 int err = -EINVAL;
1988
1989 spin_lock(&br->multicast_lock);
1990 if (p->multicast_router == val) {
1991 /* Refresh the temp router port timer */
1992 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1993 mod_timer(&p->multicast_router_timer,
1994 now + br->multicast_querier_interval);
1995 err = 0;
1996 goto unlock;
1997 }
1998 switch (val) {
1999 case MDB_RTR_TYPE_DISABLED:
2000 p->multicast_router = MDB_RTR_TYPE_DISABLED;
2001 __del_port_router(p);
2002 del_timer(&p->multicast_router_timer);
2003 break;
2004 case MDB_RTR_TYPE_TEMP_QUERY:
2005 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2006 __del_port_router(p);
2007 break;
2008 case MDB_RTR_TYPE_PERM:
2009 p->multicast_router = MDB_RTR_TYPE_PERM;
2010 del_timer(&p->multicast_router_timer);
2011 br_multicast_add_router(br, p);
2012 break;
2013 case MDB_RTR_TYPE_TEMP:
2014 p->multicast_router = MDB_RTR_TYPE_TEMP;
2015 br_multicast_mark_router(br, p);
2016 break;
2017 default:
2018 goto unlock;
2019 }
2020 err = 0;
2021 unlock:
2022 spin_unlock(&br->multicast_lock);
2023
2024 return err;
2025 }
2026
2027 static void br_multicast_start_querier(struct net_bridge *br,
2028 struct bridge_mcast_own_query *query)
2029 {
2030 struct net_bridge_port *port;
2031
2032 __br_multicast_open(br, query);
2033
2034 list_for_each_entry(port, &br->port_list, list) {
2035 if (port->state == BR_STATE_DISABLED ||
2036 port->state == BR_STATE_BLOCKING)
2037 continue;
2038
2039 if (query == &br->ip4_own_query)
2040 br_multicast_enable(&port->ip4_own_query);
2041 #if IS_ENABLED(CONFIG_IPV6)
2042 else
2043 br_multicast_enable(&port->ip6_own_query);
2044 #endif
2045 }
2046 }
2047
2048 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2049 {
2050 struct net_bridge_port *port;
2051
2052 spin_lock_bh(&br->multicast_lock);
2053 if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val)
2054 goto unlock;
2055
2056 br_mc_disabled_update(br->dev, val);
2057 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val);
2058 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) {
2059 br_multicast_leave_snoopers(br);
2060 goto unlock;
2061 }
2062
2063 if (!netif_running(br->dev))
2064 goto unlock;
2065
2066 br_multicast_open(br);
2067 list_for_each_entry(port, &br->port_list, list)
2068 __br_multicast_enable_port(port);
2069
2070 unlock:
2071 spin_unlock_bh(&br->multicast_lock);
2072
2073 return 0;
2074 }
2075
2076 bool br_multicast_enabled(const struct net_device *dev)
2077 {
2078 struct net_bridge *br = netdev_priv(dev);
2079
2080 return !!br_opt_get(br, BROPT_MULTICAST_ENABLED);
2081 }
2082 EXPORT_SYMBOL_GPL(br_multicast_enabled);
2083
2084 bool br_multicast_router(const struct net_device *dev)
2085 {
2086 struct net_bridge *br = netdev_priv(dev);
2087 bool is_router;
2088
2089 spin_lock_bh(&br->multicast_lock);
2090 is_router = br_multicast_is_router(br);
2091 spin_unlock_bh(&br->multicast_lock);
2092 return is_router;
2093 }
2094 EXPORT_SYMBOL_GPL(br_multicast_router);
2095
2096 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2097 {
2098 unsigned long max_delay;
2099
2100 val = !!val;
2101
2102 spin_lock_bh(&br->multicast_lock);
2103 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val)
2104 goto unlock;
2105
2106 br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val);
2107 if (!val)
2108 goto unlock;
2109
2110 max_delay = br->multicast_query_response_interval;
2111
2112 if (!timer_pending(&br->ip4_other_query.timer))
2113 br->ip4_other_query.delay_time = jiffies + max_delay;
2114
2115 br_multicast_start_querier(br, &br->ip4_own_query);
2116
2117 #if IS_ENABLED(CONFIG_IPV6)
2118 if (!timer_pending(&br->ip6_other_query.timer))
2119 br->ip6_other_query.delay_time = jiffies + max_delay;
2120
2121 br_multicast_start_querier(br, &br->ip6_own_query);
2122 #endif
2123
2124 unlock:
2125 spin_unlock_bh(&br->multicast_lock);
2126
2127 return 0;
2128 }
2129
2130 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2131 {
2132 /* Currently we support only version 2 and 3 */
2133 switch (val) {
2134 case 2:
2135 case 3:
2136 break;
2137 default:
2138 return -EINVAL;
2139 }
2140
2141 spin_lock_bh(&br->multicast_lock);
2142 br->multicast_igmp_version = val;
2143 spin_unlock_bh(&br->multicast_lock);
2144
2145 return 0;
2146 }
2147
2148 #if IS_ENABLED(CONFIG_IPV6)
2149 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2150 {
2151 /* Currently we support version 1 and 2 */
2152 switch (val) {
2153 case 1:
2154 case 2:
2155 break;
2156 default:
2157 return -EINVAL;
2158 }
2159
2160 spin_lock_bh(&br->multicast_lock);
2161 br->multicast_mld_version = val;
2162 spin_unlock_bh(&br->multicast_lock);
2163
2164 return 0;
2165 }
2166 #endif
2167
2168 /**
2169 * br_multicast_list_adjacent - Returns snooped multicast addresses
2170 * @dev: The bridge port adjacent to which to retrieve addresses
2171 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2172 *
2173 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2174 * snooping feature on all bridge ports of dev's bridge device, excluding
2175 * the addresses from dev itself.
2176 *
2177 * Returns the number of items added to br_ip_list.
2178 *
2179 * Notes:
2180 * - br_ip_list needs to be initialized by caller
2181 * - br_ip_list might contain duplicates in the end
2182 * (needs to be taken care of by caller)
2183 * - br_ip_list needs to be freed by caller
2184 */
2185 int br_multicast_list_adjacent(struct net_device *dev,
2186 struct list_head *br_ip_list)
2187 {
2188 struct net_bridge *br;
2189 struct net_bridge_port *port;
2190 struct net_bridge_port_group *group;
2191 struct br_ip_list *entry;
2192 int count = 0;
2193
2194 rcu_read_lock();
2195 if (!br_ip_list || !br_port_exists(dev))
2196 goto unlock;
2197
2198 port = br_port_get_rcu(dev);
2199 if (!port || !port->br)
2200 goto unlock;
2201
2202 br = port->br;
2203
2204 list_for_each_entry_rcu(port, &br->port_list, list) {
2205 if (!port->dev || port->dev == dev)
2206 continue;
2207
2208 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2209 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2210 if (!entry)
2211 goto unlock;
2212
2213 entry->addr = group->addr;
2214 list_add(&entry->list, br_ip_list);
2215 count++;
2216 }
2217 }
2218
2219 unlock:
2220 rcu_read_unlock();
2221 return count;
2222 }
2223 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2224
2225 /**
2226 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2227 * @dev: The bridge port providing the bridge on which to check for a querier
2228 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2229 *
2230 * Checks whether the given interface has a bridge on top and if so returns
2231 * true if a valid querier exists anywhere on the bridged link layer.
2232 * Otherwise returns false.
2233 */
2234 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2235 {
2236 struct net_bridge *br;
2237 struct net_bridge_port *port;
2238 struct ethhdr eth;
2239 bool ret = false;
2240
2241 rcu_read_lock();
2242 if (!br_port_exists(dev))
2243 goto unlock;
2244
2245 port = br_port_get_rcu(dev);
2246 if (!port || !port->br)
2247 goto unlock;
2248
2249 br = port->br;
2250
2251 memset(&eth, 0, sizeof(eth));
2252 eth.h_proto = htons(proto);
2253
2254 ret = br_multicast_querier_exists(br, &eth);
2255
2256 unlock:
2257 rcu_read_unlock();
2258 return ret;
2259 }
2260 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2261
2262 /**
2263 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2264 * @dev: The bridge port adjacent to which to check for a querier
2265 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2266 *
2267 * Checks whether the given interface has a bridge on top and if so returns
2268 * true if a selected querier is behind one of the other ports of this
2269 * bridge. Otherwise returns false.
2270 */
2271 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2272 {
2273 struct net_bridge *br;
2274 struct net_bridge_port *port;
2275 bool ret = false;
2276
2277 rcu_read_lock();
2278 if (!br_port_exists(dev))
2279 goto unlock;
2280
2281 port = br_port_get_rcu(dev);
2282 if (!port || !port->br)
2283 goto unlock;
2284
2285 br = port->br;
2286
2287 switch (proto) {
2288 case ETH_P_IP:
2289 if (!timer_pending(&br->ip4_other_query.timer) ||
2290 rcu_dereference(br->ip4_querier.port) == port)
2291 goto unlock;
2292 break;
2293 #if IS_ENABLED(CONFIG_IPV6)
2294 case ETH_P_IPV6:
2295 if (!timer_pending(&br->ip6_other_query.timer) ||
2296 rcu_dereference(br->ip6_querier.port) == port)
2297 goto unlock;
2298 break;
2299 #endif
2300 default:
2301 goto unlock;
2302 }
2303
2304 ret = true;
2305 unlock:
2306 rcu_read_unlock();
2307 return ret;
2308 }
2309 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2310
2311 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
2312 const struct sk_buff *skb, u8 type, u8 dir)
2313 {
2314 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
2315 __be16 proto = skb->protocol;
2316 unsigned int t_len;
2317
2318 u64_stats_update_begin(&pstats->syncp);
2319 switch (proto) {
2320 case htons(ETH_P_IP):
2321 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
2322 switch (type) {
2323 case IGMP_HOST_MEMBERSHIP_REPORT:
2324 pstats->mstats.igmp_v1reports[dir]++;
2325 break;
2326 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2327 pstats->mstats.igmp_v2reports[dir]++;
2328 break;
2329 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2330 pstats->mstats.igmp_v3reports[dir]++;
2331 break;
2332 case IGMP_HOST_MEMBERSHIP_QUERY:
2333 if (t_len != sizeof(struct igmphdr)) {
2334 pstats->mstats.igmp_v3queries[dir]++;
2335 } else {
2336 unsigned int offset = skb_transport_offset(skb);
2337 struct igmphdr *ih, _ihdr;
2338
2339 ih = skb_header_pointer(skb, offset,
2340 sizeof(_ihdr), &_ihdr);
2341 if (!ih)
2342 break;
2343 if (!ih->code)
2344 pstats->mstats.igmp_v1queries[dir]++;
2345 else
2346 pstats->mstats.igmp_v2queries[dir]++;
2347 }
2348 break;
2349 case IGMP_HOST_LEAVE_MESSAGE:
2350 pstats->mstats.igmp_leaves[dir]++;
2351 break;
2352 }
2353 break;
2354 #if IS_ENABLED(CONFIG_IPV6)
2355 case htons(ETH_P_IPV6):
2356 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2357 sizeof(struct ipv6hdr);
2358 t_len -= skb_network_header_len(skb);
2359 switch (type) {
2360 case ICMPV6_MGM_REPORT:
2361 pstats->mstats.mld_v1reports[dir]++;
2362 break;
2363 case ICMPV6_MLD2_REPORT:
2364 pstats->mstats.mld_v2reports[dir]++;
2365 break;
2366 case ICMPV6_MGM_QUERY:
2367 if (t_len != sizeof(struct mld_msg))
2368 pstats->mstats.mld_v2queries[dir]++;
2369 else
2370 pstats->mstats.mld_v1queries[dir]++;
2371 break;
2372 case ICMPV6_MGM_REDUCTION:
2373 pstats->mstats.mld_leaves[dir]++;
2374 break;
2375 }
2376 break;
2377 #endif /* CONFIG_IPV6 */
2378 }
2379 u64_stats_update_end(&pstats->syncp);
2380 }
2381
2382 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
2383 const struct sk_buff *skb, u8 type, u8 dir)
2384 {
2385 struct bridge_mcast_stats __percpu *stats;
2386
2387 /* if multicast_disabled is true then igmp type can't be set */
2388 if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
2389 return;
2390
2391 if (p)
2392 stats = p->mcast_stats;
2393 else
2394 stats = br->mcast_stats;
2395 if (WARN_ON(!stats))
2396 return;
2397
2398 br_mcast_stats_add(stats, skb, type, dir);
2399 }
2400
2401 int br_multicast_init_stats(struct net_bridge *br)
2402 {
2403 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2404 if (!br->mcast_stats)
2405 return -ENOMEM;
2406
2407 return 0;
2408 }
2409
2410 void br_multicast_uninit_stats(struct net_bridge *br)
2411 {
2412 free_percpu(br->mcast_stats);
2413 }
2414
2415 static void mcast_stats_add_dir(u64 *dst, u64 *src)
2416 {
2417 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2418 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2419 }
2420
2421 void br_multicast_get_stats(const struct net_bridge *br,
2422 const struct net_bridge_port *p,
2423 struct br_mcast_stats *dest)
2424 {
2425 struct bridge_mcast_stats __percpu *stats;
2426 struct br_mcast_stats tdst;
2427 int i;
2428
2429 memset(dest, 0, sizeof(*dest));
2430 if (p)
2431 stats = p->mcast_stats;
2432 else
2433 stats = br->mcast_stats;
2434 if (WARN_ON(!stats))
2435 return;
2436
2437 memset(&tdst, 0, sizeof(tdst));
2438 for_each_possible_cpu(i) {
2439 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2440 struct br_mcast_stats temp;
2441 unsigned int start;
2442
2443 do {
2444 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2445 memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2446 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2447
2448 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2449 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2450 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
2451 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2452 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2453 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2454 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2455 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2456
2457 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2458 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
2459 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2460 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2461 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2462 tdst.mld_parse_errors += temp.mld_parse_errors;
2463 }
2464 memcpy(dest, &tdst, sizeof(*dest));
2465 }
2466
2467 int br_mdb_hash_init(struct net_bridge *br)
2468 {
2469 return rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params);
2470 }
2471
2472 void br_mdb_hash_fini(struct net_bridge *br)
2473 {
2474 rhashtable_destroy(&br->mdb_hash_tbl);
2475 }
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