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[mirror_ubuntu-jammy-kernel.git] / net / bridge / br_multicast.c
CommitLineData
2874c5fd 1// SPDX-License-Identifier: GPL-2.0-or-later
eb1d1641
HX		 2/*
3 * Bridge multicast support.
4 *
5 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
eb1d1641
HX		 6 */
7
8#include <linux/err.h>
07f8ac4a 9#include <linux/export.h>
eb1d1641
HX		 10#include <linux/if_ether.h>
11#include <linux/igmp.h>
4b3087c7 12#include <linux/in.h>
eb1d1641
HX		 13#include <linux/jhash.h>
14#include <linux/kernel.h>
b195167f 15#include <linux/log2.h>
eb1d1641
HX		 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>
1c8ad5bf 23#include <linux/inetdevice.h>
91b02d3d 24#include <linux/mroute.h>
eb1d1641 25#include <net/ip.h>
147c1e9b 26#include <net/switchdev.h>
dfd56b8b 27#if IS_ENABLED(CONFIG_IPV6)
4b3087c7 28#include <linux/icmpv6.h>
08b202b6
YH		 29#include <net/ipv6.h>
30#include <net/mld.h>
d4c4f07d 31#include <net/ip6_checksum.h>
3c3769e6 32#include <net/addrconf.h>
08b202b6 33#endif
eb1d1641
HX		 34
35#include "br_private.h"
36
19e3a9c9
NA		 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,
19e3a9c9
NA		 42};
43
cc0fdd80 44static void br_multicast_start_querier(struct net_bridge *br,
90010b36 45 struct bridge_mcast_own_query *query);
754bc547
SA		 46static void br_multicast_add_router(struct net_bridge *br,
47 struct net_bridge_port *port);
bc8c20ac
SA		 48static void br_ip4_multicast_leave_group(struct net_bridge *br,
49 struct net_bridge_port *port,
50 __be32 group,
6db6f0ea
FF		 51 __u16 vid,
52 const unsigned char *src);
53
f12e7d95 54static void __del_port_router(struct net_bridge_port *p);
bc8c20ac
SA		 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,
6db6f0ea 59 __u16 vid, const unsigned char *src);
bc8c20ac 60#endif
c83b8fab 61
19e3a9c9
NA		 62static struct net_bridge_mdb_entry *br_mdb_ip_get_rcu(struct net_bridge *br,
63 struct br_ip *dst)
08b202b6 64{
19e3a9c9 65 return rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
08b202b6 66}
08b202b6 67
19e3a9c9
NA		 68struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge *br,
69 struct br_ip *dst)
eb1d1641 70{
19e3a9c9 71 struct net_bridge_mdb_entry *ent;
eb1d1641 72
19e3a9c9 73 lockdep_assert_held_once(&br->multicast_lock);
eb1d1641 74
19e3a9c9
NA		 75 rcu_read_lock();
76 ent = rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
77 rcu_read_unlock();
7f285fa7 78
19e3a9c9 79 return ent;
7f285fa7
HX		 80}
81
19e3a9c9
NA		 82static struct net_bridge_mdb_entry *br_mdb_ip4_get(struct net_bridge *br,
83 __be32 dst, __u16 vid)
eb1d1641 84{
8ef2a9a5
YH		 85 struct br_ip br_dst;
86
19e3a9c9 87 memset(&br_dst, 0, sizeof(br_dst));
8ef2a9a5
YH		 88 br_dst.u.ip4 = dst;
89 br_dst.proto = htons(ETH_P_IP);
b0e9a30d 90 br_dst.vid = vid;
0821ec55 91
19e3a9c9 92 return br_mdb_ip_get(br, &br_dst);
8ef2a9a5
YH		 93}
94
dfd56b8b 95#if IS_ENABLED(CONFIG_IPV6)
19e3a9c9
NA		 96static struct net_bridge_mdb_entry *br_mdb_ip6_get(struct net_bridge *br,
97 const struct in6_addr *dst,
98 __u16 vid)
08b202b6
YH		 99{
100 struct br_ip br_dst;
0821ec55 101
19e3a9c9 102 memset(&br_dst, 0, sizeof(br_dst));
4e3fd7a0 103 br_dst.u.ip6 = *dst;
08b202b6 104 br_dst.proto = htons(ETH_P_IPV6);
b0e9a30d 105 br_dst.vid = vid;
08b202b6 106
19e3a9c9 107 return br_mdb_ip_get(br, &br_dst);
08b202b6
YH		 108}
109#endif
110
eb1d1641 111struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
fbca58a2 112 struct sk_buff *skb, u16 vid)
eb1d1641 113{
8ef2a9a5
YH		 114 struct br_ip ip;
115
13cefad2 116 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
eb1d1641
HX		 117 return NULL;
118
8ef2a9a5 119 if (BR_INPUT_SKB_CB(skb)->igmp)
eb1d1641
HX		 120 return NULL;
121
19e3a9c9 122 memset(&ip, 0, sizeof(ip));
8ef2a9a5 123 ip.proto = skb->protocol;
fbca58a2 124 ip.vid = vid;
8ef2a9a5 125
eb1d1641
HX		 126 switch (skb->protocol) {
127 case htons(ETH_P_IP):
8ef2a9a5
YH		 128 ip.u.ip4 = ip_hdr(skb)->daddr;
129 break;
dfd56b8b 130#if IS_ENABLED(CONFIG_IPV6)
08b202b6 131 case htons(ETH_P_IPV6):
4e3fd7a0 132 ip.u.ip6 = ipv6_hdr(skb)->daddr;
08b202b6
YH		 133 break;
134#endif
8ef2a9a5
YH		 135 default:
136 return NULL;
eb1d1641
HX		 137 }
138
19e3a9c9 139 return br_mdb_ip_get_rcu(br, &ip);
eb1d1641
HX		 140}
141
88c1f37f 142static void br_multicast_group_expired(struct timer_list *t)
eb1d1641 143{
88c1f37f 144 struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer);
eb1d1641 145 struct net_bridge *br = mp->br;
eb1d1641
HX		 146
147 spin_lock(&br->multicast_lock);
148 if (!netif_running(br->dev) || timer_pending(&mp->timer))
149 goto out;
150
1bc844ee 151 br_multicast_host_leave(mp, true);
eb1d1641
HX		 152
153 if (mp->ports)
154 goto out;
155
19e3a9c9
NA		 156 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
157 br_mdb_rht_params);
158 hlist_del_rcu(&mp->mdb_node);
eb1d1641 159
4329596c 160 kfree_rcu(mp, rcu);
eb1d1641
HX		 161
162out:
163 spin_unlock(&br->multicast_lock);
164}
165
166static void br_multicast_del_pg(struct net_bridge *br,
167 struct net_bridge_port_group *pg)
168{
eb1d1641
HX		 169 struct net_bridge_mdb_entry *mp;
170 struct net_bridge_port_group *p;
e8051688
ED		 171 struct net_bridge_port_group __rcu **pp;
172
19e3a9c9 173 mp = br_mdb_ip_get(br, &pg->addr);
eb1d1641
HX		 174 if (WARN_ON(!mp))
175 return;
176
e8051688
ED		 177 for (pp = &mp->ports;
178 (p = mlock_dereference(*pp, br)) != NULL;
179 pp = &p->next) {
eb1d1641
HX		 180 if (p != pg)
181 continue;
182
83f6a740 183 rcu_assign_pointer(*pp, p->next);
eb1d1641
HX		 184 hlist_del_init(&p->mglist);
185 del_timer(&p->timer);
45ebcce5
ER		 186 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
187 p->flags);
4329596c 188 kfree_rcu(p, rcu);
eb1d1641 189
ff0fd34e 190 if (!mp->ports && !mp->host_joined &&
eb1d1641
HX		 191 netif_running(br->dev))
192 mod_timer(&mp->timer, jiffies);
193
194 return;
195 }
196
197 WARN_ON(1);
198}
199
88c1f37f 200static void br_multicast_port_group_expired(struct timer_list *t)
eb1d1641 201{
88c1f37f 202 struct net_bridge_port_group *pg = from_timer(pg, t, timer);
eb1d1641
HX		 203 struct net_bridge *br = pg->port->br;
204
205 spin_lock(&br->multicast_lock);
206 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
9d06b6d8 207 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
eb1d1641
HX		 208 goto out;
209
210 br_multicast_del_pg(br, pg);
211
212out:
213 spin_unlock(&br->multicast_lock);
214}
215
8ef2a9a5 216static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
1080ab95
NA		 217 __be32 group,
218 u8 *igmp_type)
eb1d1641 219{
5e923585
NA		 220 struct igmpv3_query *ihv3;
221 size_t igmp_hdr_size;
eb1d1641
HX		 222 struct sk_buff *skb;
223 struct igmphdr *ih;
224 struct ethhdr *eth;
225 struct iphdr *iph;
226
5e923585
NA		 227 igmp_hdr_size = sizeof(*ih);
228 if (br->multicast_igmp_version == 3)
229 igmp_hdr_size = sizeof(*ihv3);
eb1d1641 230 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
5e923585 231 igmp_hdr_size + 4);
eb1d1641
HX		 232 if (!skb)
233 goto out;
234
235 skb->protocol = htons(ETH_P_IP);
236
237 skb_reset_mac_header(skb);
238 eth = eth_hdr(skb);
239
e5a727f6 240 ether_addr_copy(eth->h_source, br->dev->dev_addr);
eb1d1641
HX		 241 eth->h_dest[0] = 1;
242 eth->h_dest[1] = 0;
243 eth->h_dest[2] = 0x5e;
244 eth->h_dest[3] = 0;
245 eth->h_dest[4] = 0;
246 eth->h_dest[5] = 1;
247 eth->h_proto = htons(ETH_P_IP);
248 skb_put(skb, sizeof(*eth));
249
250 skb_set_network_header(skb, skb->len);
251 iph = ip_hdr(skb);
252
253 iph->version = 4;
254 iph->ihl = 6;
255 iph->tos = 0xc0;
5e923585 256 iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4);
eb1d1641
HX		 257 iph->id = 0;
258 iph->frag_off = htons(IP_DF);
259 iph->ttl = 1;
260 iph->protocol = IPPROTO_IGMP;
675779ad 261 iph->saddr = br_opt_get(br, BROPT_MULTICAST_QUERY_USE_IFADDR) ?
1c8ad5bf 262 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
eb1d1641
HX		 263 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
264 ((u8 *)&iph[1])[0] = IPOPT_RA;
265 ((u8 *)&iph[1])[1] = 4;
266 ((u8 *)&iph[1])[2] = 0;
267 ((u8 *)&iph[1])[3] = 0;
268 ip_send_check(iph);
269 skb_put(skb, 24);
270
271 skb_set_transport_header(skb, skb->len);
1080ab95 272 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
eb1d1641 273
5e923585
NA		 274 switch (br->multicast_igmp_version) {
275 case 2:
276 ih = igmp_hdr(skb);
277 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
278 ih->code = (group ? br->multicast_last_member_interval :
279 br->multicast_query_response_interval) /
280 (HZ / IGMP_TIMER_SCALE);
281 ih->group = group;
282 ih->csum = 0;
283 ih->csum = ip_compute_csum((void *)ih, sizeof(*ih));
284 break;
285 case 3:
286 ihv3 = igmpv3_query_hdr(skb);
287 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
288 ihv3->code = (group ? br->multicast_last_member_interval :
289 br->multicast_query_response_interval) /
290 (HZ / IGMP_TIMER_SCALE);
291 ihv3->group = group;
292 ihv3->qqic = br->multicast_query_interval / HZ;
293 ihv3->nsrcs = 0;
294 ihv3->resv = 0;
295 ihv3->suppress = 0;
296 ihv3->qrv = 2;
297 ihv3->csum = 0;
298 ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3));
299 break;
300 }
301
302 skb_put(skb, igmp_hdr_size);
eb1d1641
HX		 303 __skb_pull(skb, sizeof(*eth));
304
305out:
306 return skb;
307}
308
dfd56b8b 309#if IS_ENABLED(CONFIG_IPV6)
08b202b6 310static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
1080ab95
NA		 311 const struct in6_addr *grp,
312 u8 *igmp_type)
08b202b6 313{
aa2ae3e7
NA		 314 struct mld2_query *mld2q;
315 unsigned long interval;
08b202b6
YH		 316 struct ipv6hdr *ip6h;
317 struct mld_msg *mldq;
aa2ae3e7
NA		 318 size_t mld_hdr_size;
319 struct sk_buff *skb;
08b202b6
YH		 320 struct ethhdr *eth;
321 u8 *hopopt;
08b202b6 322
aa2ae3e7
NA		 323 mld_hdr_size = sizeof(*mldq);
324 if (br->multicast_mld_version == 2)
325 mld_hdr_size = sizeof(*mld2q);
08b202b6 326 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
aa2ae3e7 327 8 + mld_hdr_size);
08b202b6
YH		 328 if (!skb)
329 goto out;
330
331 skb->protocol = htons(ETH_P_IPV6);
332
333 /* Ethernet header */
334 skb_reset_mac_header(skb);
335 eth = eth_hdr(skb);
336
e5a727f6 337 ether_addr_copy(eth->h_source, br->dev->dev_addr);
08b202b6
YH		 338 eth->h_proto = htons(ETH_P_IPV6);
339 skb_put(skb, sizeof(*eth));
340
341 /* IPv6 header + HbH option */
342 skb_set_network_header(skb, skb->len);
343 ip6h = ipv6_hdr(skb);
344
345 *(__force __be32 *)ip6h = htonl(0x60000000);
aa2ae3e7 346 ip6h->payload_len = htons(8 + mld_hdr_size);
08b202b6
YH		 347 ip6h->nexthdr = IPPROTO_HOPOPTS;
348 ip6h->hop_limit = 1;
a7bff75b 349 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
d1d81d4c
UW		 350 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
351 &ip6h->saddr)) {
352 kfree_skb(skb);
675779ad 353 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, false);
d1d81d4c
UW		 354 return NULL;
355 }
0888d5f3 356
675779ad 357 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
36cff5a1 358 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
08b202b6
YH		 359
360 hopopt = (u8 *)(ip6h + 1);
361 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
362 hopopt[1] = 0; /* length of HbH */
363 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
364 hopopt[3] = 2; /* Length of RA Option */
365 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
366 hopopt[5] = 0;
1de5a71c
EZ		 367 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
368 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
08b202b6
YH		 369
370 skb_put(skb, sizeof(*ip6h) + 8);
371
372 /* ICMPv6 */
373 skb_set_transport_header(skb, skb->len);
1080ab95 374 interval = ipv6_addr_any(grp) ?
32de868c
LL		 375 br->multicast_query_response_interval :
376 br->multicast_last_member_interval;
1080ab95 377 *igmp_type = ICMPV6_MGM_QUERY;
aa2ae3e7
NA		 378 switch (br->multicast_mld_version) {
379 case 1:
380 mldq = (struct mld_msg *)icmp6_hdr(skb);
381 mldq->mld_type = ICMPV6_MGM_QUERY;
382 mldq->mld_code = 0;
383 mldq->mld_cksum = 0;
384 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
385 mldq->mld_reserved = 0;
386 mldq->mld_mca = *grp;
387 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
388 sizeof(*mldq), IPPROTO_ICMPV6,
389 csum_partial(mldq,
390 sizeof(*mldq),
391 0));
392 break;
393 case 2:
394 mld2q = (struct mld2_query *)icmp6_hdr(skb);
53631a5f 395 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
aa2ae3e7
NA		 396 mld2q->mld2q_type = ICMPV6_MGM_QUERY;
397 mld2q->mld2q_code = 0;
398 mld2q->mld2q_cksum = 0;
399 mld2q->mld2q_resv1 = 0;
400 mld2q->mld2q_resv2 = 0;
401 mld2q->mld2q_suppress = 0;
402 mld2q->mld2q_qrv = 2;
403 mld2q->mld2q_nsrcs = 0;
404 mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
405 mld2q->mld2q_mca = *grp;
406 mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
407 sizeof(*mld2q),
408 IPPROTO_ICMPV6,
409 csum_partial(mld2q,
410 sizeof(*mld2q),
411 0));
412 break;
413 }
414 skb_put(skb, mld_hdr_size);
08b202b6
YH		 415
416 __skb_pull(skb, sizeof(*eth));
417
418out:
419 return skb;
420}
421#endif
422
8ef2a9a5 423static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
1080ab95
NA		 424 struct br_ip *addr,
425 u8 *igmp_type)
8ef2a9a5
YH		 426{
427 switch (addr->proto) {
428 case htons(ETH_P_IP):
1080ab95 429 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
dfd56b8b 430#if IS_ENABLED(CONFIG_IPV6)
08b202b6 431 case htons(ETH_P_IPV6):
1080ab95
NA		 432 return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
433 igmp_type);
08b202b6 434#endif
8ef2a9a5
YH		 435 }
436 return NULL;
437}
438
cfd56754 439struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
5e923585 440 struct br_ip *group)
eb1d1641 441{
eb1d1641 442 struct net_bridge_mdb_entry *mp;
4c0833bc 443 int err;
eb1d1641 444
19e3a9c9
NA		 445 mp = br_mdb_ip_get(br, group);
446 if (mp)
447 return mp;
eb1d1641 448
19e3a9c9
NA		 449 if (atomic_read(&br->mdb_hash_tbl.nelems) >= br->hash_max) {
450 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false);
451 return ERR_PTR(-E2BIG);
eb1d1641
HX		 452 }
453
454 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
455 if (unlikely(!mp))
4c0833bc 456 return ERR_PTR(-ENOMEM);
eb1d1641
HX		 457
458 mp->br = br;
8ef2a9a5 459 mp->addr = *group;
88c1f37f 460 timer_setup(&mp->timer, br_multicast_group_expired, 0);
19e3a9c9
NA		 461 err = rhashtable_lookup_insert_fast(&br->mdb_hash_tbl, &mp->rhnode,
462 br_mdb_rht_params);
463 if (err) {
464 kfree(mp);
465 mp = ERR_PTR(err);
466 } else {
467 hlist_add_head_rcu(&mp->mdb_node, &br->mdb_list);
468 }
1faabf2a 469
eb1d1641
HX		 470 return mp;
471}
472
cfd56754
CW		 473struct net_bridge_port_group *br_multicast_new_port_group(
474 struct net_bridge_port *port,
475 struct br_ip *group,
ccb1c31a 476 struct net_bridge_port_group __rcu *next,
6db6f0ea
FF		 477 unsigned char flags,
478 const unsigned char *src)
cfd56754
CW		 479{
480 struct net_bridge_port_group *p;
481
482 p = kzalloc(sizeof(*p), GFP_ATOMIC);
483 if (unlikely(!p))
484 return NULL;
485
486 p->addr = *group;
487 p->port = port;
9d06b6d8 488 p->flags = flags;
eca2a43b 489 rcu_assign_pointer(p->next, next);
cfd56754 490 hlist_add_head(&p->mglist, &port->mglist);
88c1f37f 491 timer_setup(&p->timer, br_multicast_port_group_expired, 0);
6db6f0ea
FF		 492
493 if (src)
494 memcpy(p->eth_addr, src, ETH_ALEN);
495 else
1bfe45f4 496 eth_broadcast_addr(p->eth_addr);
6db6f0ea 497
cfd56754
CW		 498 return p;
499}
500
6db6f0ea
FF		 501static bool br_port_group_equal(struct net_bridge_port_group *p,
502 struct net_bridge_port *port,
503 const unsigned char *src)
504{
505 if (p->port != port)
506 return false;
507
508 if (!(port->flags & BR_MULTICAST_TO_UNICAST))
509 return true;
510
511 return ether_addr_equal(src, p->eth_addr);
512}
513
1bc844ee
NA		 514void br_multicast_host_join(struct net_bridge_mdb_entry *mp, bool notify)
515{
516 if (!mp->host_joined) {
517 mp->host_joined = true;
518 if (notify)
519 br_mdb_notify(mp->br->dev, NULL, &mp->addr,
520 RTM_NEWMDB, 0);
521 }
522 mod_timer(&mp->timer, jiffies + mp->br->multicast_membership_interval);
523}
524
525void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify)
526{
527 if (!mp->host_joined)
528 return;
529
530 mp->host_joined = false;
531 if (notify)
532 br_mdb_notify(mp->br->dev, NULL, &mp->addr, RTM_DELMDB, 0);
533}
534
eb1d1641 535static int br_multicast_add_group(struct net_bridge *br,
8ef2a9a5 536 struct net_bridge_port *port,
6db6f0ea
FF		 537 struct br_ip *group,
538 const unsigned char *src)
eb1d1641 539{
e8051688 540 struct net_bridge_port_group __rcu **pp;
5e923585
NA		 541 struct net_bridge_port_group *p;
542 struct net_bridge_mdb_entry *mp;
454594f3 543 unsigned long now = jiffies;
eb1d1641
HX		 544 int err;
545
eb1d1641
HX		 546 spin_lock(&br->multicast_lock);
547 if (!netif_running(br->dev) ||
548 (port && port->state == BR_STATE_DISABLED))
549 goto out;
550
19e3a9c9 551 mp = br_multicast_new_group(br, group);
eb1d1641 552 err = PTR_ERR(mp);
4c0833bc 553 if (IS_ERR(mp))
eb1d1641
HX		 554 goto err;
555
556 if (!port) {
1bc844ee 557 br_multicast_host_join(mp, true);
eb1d1641
HX		 558 goto out;
559 }
560
e8051688
ED		 561 for (pp = &mp->ports;
562 (p = mlock_dereference(*pp, br)) != NULL;
563 pp = &p->next) {
6db6f0ea 564 if (br_port_group_equal(p, port, src))
454594f3 565 goto found;
eb1d1641
HX		 566 if ((unsigned long)p->port < (unsigned long)port)
567 break;
568 }
569
6db6f0ea 570 p = br_multicast_new_port_group(port, group, *pp, 0, src);
eb1d1641
HX		 571 if (unlikely(!p))
572 goto err;
eb1d1641 573 rcu_assign_pointer(*pp, p);
45ebcce5 574 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
eb1d1641 575
454594f3
LL		 576found:
577 mod_timer(&p->timer, now + br->multicast_membership_interval);
eb1d1641
HX		 578out:
579 err = 0;
580
581err:
582 spin_unlock(&br->multicast_lock);
583 return err;
584}
585
8ef2a9a5
YH		 586static int br_ip4_multicast_add_group(struct net_bridge *br,
587 struct net_bridge_port *port,
b0e9a30d 588 __be32 group,
6db6f0ea
FF		 589 __u16 vid,
590 const unsigned char *src)
8ef2a9a5
YH		 591{
592 struct br_ip br_group;
593
594 if (ipv4_is_local_multicast(group))
595 return 0;
596
1515a63f 597 memset(&br_group, 0, sizeof(br_group));
8ef2a9a5
YH		 598 br_group.u.ip4 = group;
599 br_group.proto = htons(ETH_P_IP);
b0e9a30d 600 br_group.vid = vid;
8ef2a9a5 601
6db6f0ea 602 return br_multicast_add_group(br, port, &br_group, src);
8ef2a9a5
YH		 603}
604
dfd56b8b 605#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 606static int br_ip6_multicast_add_group(struct net_bridge *br,
607 struct net_bridge_port *port,
b0e9a30d 608 const struct in6_addr *group,
6db6f0ea
FF		 609 __u16 vid,
610 const unsigned char *src)
08b202b6
YH		 611{
612 struct br_ip br_group;
613
3c3769e6 614 if (ipv6_addr_is_ll_all_nodes(group))
08b202b6
YH		 615 return 0;
616
19e3a9c9 617 memset(&br_group, 0, sizeof(br_group));
4e3fd7a0 618 br_group.u.ip6 = *group;
9cc6e0c4 619 br_group.proto = htons(ETH_P_IPV6);
b0e9a30d 620 br_group.vid = vid;
08b202b6 621
6db6f0ea 622 return br_multicast_add_group(br, port, &br_group, src);
08b202b6
YH		 623}
624#endif
625
88c1f37f 626static void br_multicast_router_expired(struct timer_list *t)
eb1d1641 627{
88c1f37f
AP		 628 struct net_bridge_port *port =
629 from_timer(port, t, multicast_router_timer);
eb1d1641
HX		 630 struct net_bridge *br = port->br;
631
632 spin_lock(&br->multicast_lock);
a55d8246
NA		 633 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
634 port->multicast_router == MDB_RTR_TYPE_PERM ||
f12e7d95 635 timer_pending(&port->multicast_router_timer))
eb1d1641
HX		 636 goto out;
637
f12e7d95 638 __del_port_router(port);
eb1d1641
HX		 639out:
640 spin_unlock(&br->multicast_lock);
641}
642
77041420
YG		 643static void br_mc_router_state_change(struct net_bridge *p,
644 bool is_mc_router)
645{
646 struct switchdev_attr attr = {
647 .orig_dev = p->dev,
648 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
649 .flags = SWITCHDEV_F_DEFER,
650 .u.mrouter = is_mc_router,
651 };
652
653 switchdev_port_attr_set(p->dev, &attr);
654}
655
88c1f37f 656static void br_multicast_local_router_expired(struct timer_list *t)
eb1d1641 657{
88c1f37f 658 struct net_bridge *br = from_timer(br, t, multicast_router_timer);
77041420
YG		 659
660 spin_lock(&br->multicast_lock);
661 if (br->multicast_router == MDB_RTR_TYPE_DISABLED ||
662 br->multicast_router == MDB_RTR_TYPE_PERM ||
663 timer_pending(&br->multicast_router_timer))
664 goto out;
665
666 br_mc_router_state_change(br, false);
667out:
668 spin_unlock(&br->multicast_lock);
eb1d1641
HX		 669}
670
cc0fdd80 671static void br_multicast_querier_expired(struct net_bridge *br,
90010b36 672 struct bridge_mcast_own_query *query)
c83b8fab 673{
c83b8fab 674 spin_lock(&br->multicast_lock);
13cefad2 675 if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
c83b8fab
HX		 676 goto out;
677
cc0fdd80 678 br_multicast_start_querier(br, query);
c83b8fab
HX		 679
680out:
681 spin_unlock(&br->multicast_lock);
682}
683
88c1f37f 684static void br_ip4_multicast_querier_expired(struct timer_list *t)
cc0fdd80 685{
88c1f37f 686 struct net_bridge *br = from_timer(br, t, ip4_other_query.timer);
cc0fdd80 687
90010b36 688 br_multicast_querier_expired(br, &br->ip4_own_query);
cc0fdd80
LL		 689}
690
691#if IS_ENABLED(CONFIG_IPV6)
88c1f37f 692static void br_ip6_multicast_querier_expired(struct timer_list *t)
cc0fdd80 693{
88c1f37f 694 struct net_bridge *br = from_timer(br, t, ip6_other_query.timer);
cc0fdd80 695
90010b36 696 br_multicast_querier_expired(br, &br->ip6_own_query);
cc0fdd80
LL		 697}
698#endif
699
dc4eb53a
LL		 700static void br_multicast_select_own_querier(struct net_bridge *br,
701 struct br_ip *ip,
702 struct sk_buff *skb)
703{
704 if (ip->proto == htons(ETH_P_IP))
705 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
706#if IS_ENABLED(CONFIG_IPV6)
707 else
708 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
709#endif
710}
711
8ef2a9a5
YH		 712static void __br_multicast_send_query(struct net_bridge *br,
713 struct net_bridge_port *port,
714 struct br_ip *ip)
eb1d1641 715{
eb1d1641 716 struct sk_buff *skb;
1080ab95 717 u8 igmp_type;
eb1d1641 718
1080ab95 719 skb = br_multicast_alloc_query(br, ip, &igmp_type);
eb1d1641 720 if (!skb)
8ef2a9a5 721 return;
eb1d1641
HX		 722
723 if (port) {
eb1d1641 724 skb->dev = port->dev;
a65056ec 725 br_multicast_count(br, port, skb, igmp_type,
1080ab95 726 BR_MCAST_DIR_TX);
29a26a56
EB		 727 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
728 dev_net(port->dev), NULL, skb, NULL, skb->dev,
f0b4eece 729 br_dev_queue_push_xmit);
dc4eb53a
LL		 730 } else {
731 br_multicast_select_own_querier(br, ip, skb);
a65056ec 732 br_multicast_count(br, port, skb, igmp_type,
1080ab95 733 BR_MCAST_DIR_RX);
eb1d1641 734 netif_rx(skb);
dc4eb53a 735 }
8ef2a9a5
YH		 736}
737
738static void br_multicast_send_query(struct net_bridge *br,
cc0fdd80 739 struct net_bridge_port *port,
90010b36 740 struct bridge_mcast_own_query *own_query)
8ef2a9a5 741{
90010b36 742 struct bridge_mcast_other_query *other_query = NULL;
5e923585
NA		 743 struct br_ip br_group;
744 unsigned long time;
8ef2a9a5 745
13cefad2
NA		 746 if (!netif_running(br->dev) ||
747 !br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
675779ad 748 !br_opt_get(br, BROPT_MULTICAST_QUERIER))
8ef2a9a5
YH		 749 return;
750
08b202b6
YH		 751 memset(&br_group.u, 0, sizeof(br_group.u));
752
90010b36
LL		 753 if (port ? (own_query == &port->ip4_own_query) :
754 (own_query == &br->ip4_own_query)) {
755 other_query = &br->ip4_other_query;
cc0fdd80 756 br_group.proto = htons(ETH_P_IP);
dfd56b8b 757#if IS_ENABLED(CONFIG_IPV6)
cc0fdd80 758 } else {
90010b36 759 other_query = &br->ip6_other_query;
cc0fdd80 760 br_group.proto = htons(ETH_P_IPV6);
08b202b6 761#endif
cc0fdd80
LL		 762 }
763
90010b36 764 if (!other_query || timer_pending(&other_query->timer))
cc0fdd80
LL		 765 return;
766
767 __br_multicast_send_query(br, port, &br_group);
eb1d1641 768
eb1d1641 769 time = jiffies;
90010b36 770 time += own_query->startup_sent < br->multicast_startup_query_count ?
eb1d1641
HX		 771 br->multicast_startup_query_interval :
772 br->multicast_query_interval;
90010b36 773 mod_timer(&own_query->timer, time);
eb1d1641
HX		 774}
775
90010b36
LL		 776static void
777br_multicast_port_query_expired(struct net_bridge_port *port,
778 struct bridge_mcast_own_query *query)
eb1d1641 779{
eb1d1641
HX		 780 struct net_bridge *br = port->br;
781
782 spin_lock(&br->multicast_lock);
02a780c0
DC		 783 if (port->state == BR_STATE_DISABLED ||
784 port->state == BR_STATE_BLOCKING)
eb1d1641
HX		 785 goto out;
786
cc0fdd80
LL		 787 if (query->startup_sent < br->multicast_startup_query_count)
788 query->startup_sent++;
eb1d1641 789
cc0fdd80 790 br_multicast_send_query(port->br, port, query);
eb1d1641
HX		 791
792out:
793 spin_unlock(&br->multicast_lock);
794}
795
88c1f37f 796static void br_ip4_multicast_port_query_expired(struct timer_list *t)
cc0fdd80 797{
88c1f37f 798 struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer);
cc0fdd80 799
90010b36 800 br_multicast_port_query_expired(port, &port->ip4_own_query);
cc0fdd80
LL		 801}
802
803#if IS_ENABLED(CONFIG_IPV6)
88c1f37f 804static void br_ip6_multicast_port_query_expired(struct timer_list *t)
cc0fdd80 805{
88c1f37f 806 struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer);
cc0fdd80 807
90010b36 808 br_multicast_port_query_expired(port, &port->ip6_own_query);
cc0fdd80
LL		 809}
810#endif
811
147c1e9b
NF		 812static void br_mc_disabled_update(struct net_device *dev, bool value)
813{
814 struct switchdev_attr attr = {
815 .orig_dev = dev,
816 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
817 .flags = SWITCHDEV_F_DEFER,
13cefad2 818 .u.mc_disabled = !value,
147c1e9b
NF		 819 };
820
821 switchdev_port_attr_set(dev, &attr);
822}
823
1080ab95 824int br_multicast_add_port(struct net_bridge_port *port)
eb1d1641 825{
7f0aec7a 826 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
eb1d1641 827
88c1f37f
AP		 828 timer_setup(&port->multicast_router_timer,
829 br_multicast_router_expired, 0);
830 timer_setup(&port->ip4_own_query.timer,
831 br_ip4_multicast_port_query_expired, 0);
cc0fdd80 832#if IS_ENABLED(CONFIG_IPV6)
88c1f37f
AP		 833 timer_setup(&port->ip6_own_query.timer,
834 br_ip6_multicast_port_query_expired, 0);
cc0fdd80 835#endif
13cefad2
NA		 836 br_mc_disabled_update(port->dev,
837 br_opt_get(port->br, BROPT_MULTICAST_ENABLED));
147c1e9b 838
1080ab95
NA		 839 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
840 if (!port->mcast_stats)
841 return -ENOMEM;
842
843 return 0;
eb1d1641
HX		 844}
845
846void br_multicast_del_port(struct net_bridge_port *port)
847{
e10177ab
SA		 848 struct net_bridge *br = port->br;
849 struct net_bridge_port_group *pg;
850 struct hlist_node *n;
851
852 /* Take care of the remaining groups, only perm ones should be left */
853 spin_lock_bh(&br->multicast_lock);
854 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
855 br_multicast_del_pg(br, pg);
856 spin_unlock_bh(&br->multicast_lock);
eb1d1641 857 del_timer_sync(&port->multicast_router_timer);
1080ab95 858 free_percpu(port->mcast_stats);
eb1d1641
HX		 859}
860
90010b36 861static void br_multicast_enable(struct bridge_mcast_own_query *query)
561f1103 862{
cc0fdd80 863 query->startup_sent = 0;
561f1103 864
cc0fdd80
LL		 865 if (try_to_del_timer_sync(&query->timer) >= 0 ||
866 del_timer(&query->timer))
867 mod_timer(&query->timer, jiffies);
561f1103
HX		 868}
869
7cb3f921 870static void __br_multicast_enable_port(struct net_bridge_port *port)
eb1d1641
HX		 871{
872 struct net_bridge *br = port->br;
873
13cefad2 874 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || !netif_running(br->dev))
7cb3f921 875 return;
eb1d1641 876
90010b36 877 br_multicast_enable(&port->ip4_own_query);
cc0fdd80 878#if IS_ENABLED(CONFIG_IPV6)
90010b36 879 br_multicast_enable(&port->ip6_own_query);
cc0fdd80 880#endif
7f0aec7a
NA		 881 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
882 hlist_unhashed(&port->rlist))
754bc547 883 br_multicast_add_router(br, port);
7cb3f921 884}
eb1d1641 885
7cb3f921
NA		 886void br_multicast_enable_port(struct net_bridge_port *port)
887{
888 struct net_bridge *br = port->br;
889
890 spin_lock(&br->multicast_lock);
891 __br_multicast_enable_port(port);
eb1d1641
HX		 892 spin_unlock(&br->multicast_lock);
893}
894
895void br_multicast_disable_port(struct net_bridge_port *port)
896{
897 struct net_bridge *br = port->br;
898 struct net_bridge_port_group *pg;
b67bfe0d 899 struct hlist_node *n;
eb1d1641
HX		 900
901 spin_lock(&br->multicast_lock);
b67bfe0d 902 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
9d06b6d8 903 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
e10177ab 904 br_multicast_del_pg(br, pg);
eb1d1641 905
f12e7d95
NF		 906 __del_port_router(port);
907
eb1d1641 908 del_timer(&port->multicast_router_timer);
90010b36 909 del_timer(&port->ip4_own_query.timer);
cc0fdd80 910#if IS_ENABLED(CONFIG_IPV6)
90010b36 911 del_timer(&port->ip6_own_query.timer);
cc0fdd80 912#endif
eb1d1641
HX		 913 spin_unlock(&br->multicast_lock);
914}
915
8ef2a9a5
YH		 916static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
917 struct net_bridge_port *port,
06499098
VY		 918 struct sk_buff *skb,
919 u16 vid)
eb1d1641 920{
6db6f0ea 921 const unsigned char *src;
eb1d1641
HX		 922 struct igmpv3_report *ih;
923 struct igmpv3_grec *grec;
924 int i;
925 int len;
926 int num;
927 int type;
928 int err = 0;
929 __be32 group;
e57f6185 930 u16 nsrcs;
eb1d1641 931
eb1d1641
HX		 932 ih = igmpv3_report_hdr(skb);
933 num = ntohs(ih->ngrec);
c2d4fbd2 934 len = skb_transport_offset(skb) + sizeof(*ih);
eb1d1641
HX		 935
936 for (i = 0; i < num; i++) {
937 len += sizeof(*grec);
ba5ea614 938 if (!ip_mc_may_pull(skb, len))
eb1d1641
HX		 939 return -EINVAL;
940
fd218cf9 941 grec = (void *)(skb->data + len - sizeof(*grec));
eb1d1641
HX		 942 group = grec->grec_mca;
943 type = grec->grec_type;
e57f6185 944 nsrcs = ntohs(grec->grec_nsrcs);
eb1d1641 945
e57f6185 946 len += nsrcs * 4;
ba5ea614 947 if (!ip_mc_may_pull(skb, len))
eb1d1641
HX		 948 return -EINVAL;
949
950 /* We treat this as an IGMPv2 report for now. */
951 switch (type) {
952 case IGMPV3_MODE_IS_INCLUDE:
953 case IGMPV3_MODE_IS_EXCLUDE:
954 case IGMPV3_CHANGE_TO_INCLUDE:
955 case IGMPV3_CHANGE_TO_EXCLUDE:
956 case IGMPV3_ALLOW_NEW_SOURCES:
957 case IGMPV3_BLOCK_OLD_SOURCES:
958 break;
959
960 default:
961 continue;
962 }
963
6db6f0ea 964 src = eth_hdr(skb)->h_source;
bc8c20ac
SA		 965 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
966 type == IGMPV3_MODE_IS_INCLUDE) &&
e57f6185 967 nsrcs == 0) {
6db6f0ea 968 br_ip4_multicast_leave_group(br, port, group, vid, src);
bc8c20ac 969 } else {
6db6f0ea
FF		 970 err = br_ip4_multicast_add_group(br, port, group, vid,
971 src);
bc8c20ac
SA		 972 if (err)
973 break;
974 }
eb1d1641
HX		 975 }
976
977 return err;
978}
979
dfd56b8b 980#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 981static int br_ip6_multicast_mld2_report(struct net_bridge *br,
982 struct net_bridge_port *port,
06499098
VY		 983 struct sk_buff *skb,
984 u16 vid)
08b202b6 985{
ba5ea614 986 unsigned int nsrcs_offset;
6db6f0ea 987 const unsigned char *src;
08b202b6
YH		 988 struct icmp6hdr *icmp6h;
989 struct mld2_grec *grec;
ba5ea614 990 unsigned int grec_len;
08b202b6
YH		 991 int i;
992 int len;
993 int num;
994 int err = 0;
995
ba5ea614 996 if (!ipv6_mc_may_pull(skb, sizeof(*icmp6h)))
08b202b6
YH		 997 return -EINVAL;
998
999 icmp6h = icmp6_hdr(skb);
1000 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
c2d4fbd2 1001 len = skb_transport_offset(skb) + sizeof(*icmp6h);
08b202b6
YH		 1002
1003 for (i = 0; i < num; i++) {
e57f6185
NA		 1004 __be16 *_nsrcs, __nsrcs;
1005 u16 nsrcs;
08b202b6 1006
ba5ea614
LL		 1007 nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs);
1008
1009 if (skb_transport_offset(skb) + ipv6_transport_len(skb) <
1010 nsrcs_offset + sizeof(_nsrcs))
1011 return -EINVAL;
1012
e57f6185
NA		 1013 _nsrcs = skb_header_pointer(skb, nsrcs_offset,
1014 sizeof(__nsrcs), &__nsrcs);
1015 if (!_nsrcs)
08b202b6
YH		 1016 return -EINVAL;
1017
e57f6185
NA		 1018 nsrcs = ntohs(*_nsrcs);
1019 grec_len = struct_size(grec, grec_src, nsrcs);
ba5ea614
LL		 1020
1021 if (!ipv6_mc_may_pull(skb, len + grec_len))
08b202b6
YH		 1022 return -EINVAL;
1023
1024 grec = (struct mld2_grec *)(skb->data + len);
ba5ea614 1025 len += grec_len;
08b202b6
YH		 1026
1027 /* We treat these as MLDv1 reports for now. */
1028 switch (grec->grec_type) {
1029 case MLD2_MODE_IS_INCLUDE:
1030 case MLD2_MODE_IS_EXCLUDE:
1031 case MLD2_CHANGE_TO_INCLUDE:
1032 case MLD2_CHANGE_TO_EXCLUDE:
1033 case MLD2_ALLOW_NEW_SOURCES:
1034 case MLD2_BLOCK_OLD_SOURCES:
1035 break;
1036
1037 default:
1038 continue;
1039 }
1040
6db6f0ea 1041 src = eth_hdr(skb)->h_source;
bc8c20ac
SA		 1042 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1043 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
e57f6185 1044 nsrcs == 0) {
bc8c20ac 1045 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
6db6f0ea 1046 vid, src);
bc8c20ac
SA		 1047 } else {
1048 err = br_ip6_multicast_add_group(br, port,
6db6f0ea
FF		 1049 &grec->grec_mca, vid,
1050 src);
9264251e 1051 if (err)
bc8c20ac
SA		 1052 break;
1053 }
08b202b6
YH		 1054 }
1055
1056 return err;
1057}
1058#endif
1059
dc4eb53a 1060static bool br_ip4_multicast_select_querier(struct net_bridge *br,
2cd41431 1061 struct net_bridge_port *port,
dc4eb53a
LL		 1062 __be32 saddr)
1063{
1064 if (!timer_pending(&br->ip4_own_query.timer) &&
1065 !timer_pending(&br->ip4_other_query.timer))
1066 goto update;
1067
1068 if (!br->ip4_querier.addr.u.ip4)
1069 goto update;
1070
1071 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1072 goto update;
1073
1074 return false;
1075
1076update:
1077 br->ip4_querier.addr.u.ip4 = saddr;
1078
2cd41431
LL		 1079 /* update protected by general multicast_lock by caller */
1080 rcu_assign_pointer(br->ip4_querier.port, port);
1081
dc4eb53a
LL		 1082 return true;
1083}
1084
1085#if IS_ENABLED(CONFIG_IPV6)
1086static bool br_ip6_multicast_select_querier(struct net_bridge *br,
2cd41431 1087 struct net_bridge_port *port,
dc4eb53a
LL		 1088 struct in6_addr *saddr)
1089{
1090 if (!timer_pending(&br->ip6_own_query.timer) &&
1091 !timer_pending(&br->ip6_other_query.timer))
1092 goto update;
1093
1094 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1095 goto update;
1096
1097 return false;
1098
1099update:
1100 br->ip6_querier.addr.u.ip6 = *saddr;
1101
2cd41431
LL		 1102 /* update protected by general multicast_lock by caller */
1103 rcu_assign_pointer(br->ip6_querier.port, port);
1104
dc4eb53a
LL		 1105 return true;
1106}
1107#endif
1108
1109static bool br_multicast_select_querier(struct net_bridge *br,
2cd41431 1110 struct net_bridge_port *port,
dc4eb53a
LL		 1111 struct br_ip *saddr)
1112{
1113 switch (saddr->proto) {
1114 case htons(ETH_P_IP):
2cd41431 1115 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
dc4eb53a
LL		 1116#if IS_ENABLED(CONFIG_IPV6)
1117 case htons(ETH_P_IPV6):
2cd41431 1118 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
dc4eb53a
LL		 1119#endif
1120 }
1121
1122 return false;
1123}
1124
cc0fdd80 1125static void
90010b36
LL		 1126br_multicast_update_query_timer(struct net_bridge *br,
1127 struct bridge_mcast_other_query *query,
1128 unsigned long max_delay)
b00589af 1129{
90010b36
LL		 1130 if (!timer_pending(&query->timer))
1131 query->delay_time = jiffies + max_delay;
b00589af 1132
90010b36 1133 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
b00589af
LL		 1134}
1135
6d549648
NF		 1136static void br_port_mc_router_state_change(struct net_bridge_port *p,
1137 bool is_mc_router)
1138{
1139 struct switchdev_attr attr = {
1140 .orig_dev = p->dev,
1141 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
1142 .flags = SWITCHDEV_F_DEFER,
1143 .u.mrouter = is_mc_router,
1144 };
1145
1146 switchdev_port_attr_set(p->dev, &attr);
1147}
1148
7e80c124 1149/*
7c77602f 1150 * Add port to router_list
7e80c124 1151 * list is maintained ordered by pointer value
1152 * and locked by br->multicast_lock and RCU
1153 */
0909e117
HX		 1154static void br_multicast_add_router(struct net_bridge *br,
1155 struct net_bridge_port *port)
1156{
dcdca2c4 1157 struct net_bridge_port *p;
b67bfe0d 1158 struct hlist_node *slot = NULL;
dcdca2c4 1159
1a040eac
NA		 1160 if (!hlist_unhashed(&port->rlist))
1161 return;
1162
b67bfe0d 1163 hlist_for_each_entry(p, &br->router_list, rlist) {
7e80c124 1164 if ((unsigned long) port >= (unsigned long) p)
1165 break;
b67bfe0d 1166 slot = &p->rlist;
dcdca2c4 1167 }
1168
7e80c124 1169 if (slot)
1d023284 1170 hlist_add_behind_rcu(&port->rlist, slot);
dcdca2c4 1171 else
1172 hlist_add_head_rcu(&port->rlist, &br->router_list);
949f1e39 1173 br_rtr_notify(br->dev, port, RTM_NEWMDB);
6d549648 1174 br_port_mc_router_state_change(port, true);
0909e117
HX		 1175}
1176
eb1d1641
HX		 1177static void br_multicast_mark_router(struct net_bridge *br,
1178 struct net_bridge_port *port)
1179{
1180 unsigned long now = jiffies;
eb1d1641
HX		 1181
1182 if (!port) {
77041420
YG		 1183 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
1184 if (!timer_pending(&br->multicast_router_timer))
1185 br_mc_router_state_change(br, true);
eb1d1641
HX		 1186 mod_timer(&br->multicast_router_timer,
1187 now + br->multicast_querier_interval);
77041420 1188 }
eb1d1641
HX		 1189 return;
1190 }
1191
a55d8246
NA		 1192 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1193 port->multicast_router == MDB_RTR_TYPE_PERM)
eb1d1641
HX		 1194 return;
1195
0909e117 1196 br_multicast_add_router(br, port);
eb1d1641 1197
eb1d1641
HX		 1198 mod_timer(&port->multicast_router_timer,
1199 now + br->multicast_querier_interval);
1200}
1201
1202static void br_multicast_query_received(struct net_bridge *br,
1203 struct net_bridge_port *port,
90010b36 1204 struct bridge_mcast_other_query *query,
dc4eb53a 1205 struct br_ip *saddr,
b00589af 1206 unsigned long max_delay)
eb1d1641 1207{
2cd41431 1208 if (!br_multicast_select_querier(br, port, saddr))
eb1d1641
HX		 1209 return;
1210
dc4eb53a 1211 br_multicast_update_query_timer(br, query, max_delay);
278e2148 1212 br_multicast_mark_router(br, port);
eb1d1641
HX		 1213}
1214
9c2e955c 1215static void br_ip4_multicast_query(struct net_bridge *br,
1216 struct net_bridge_port *port,
1217 struct sk_buff *skb,
1218 u16 vid)
eb1d1641 1219{
ba5ea614 1220 unsigned int transport_len = ip_transport_len(skb);
b71d1d42 1221 const struct iphdr *iph = ip_hdr(skb);
eb1d1641
HX		 1222 struct igmphdr *ih = igmp_hdr(skb);
1223 struct net_bridge_mdb_entry *mp;
1224 struct igmpv3_query *ih3;
1225 struct net_bridge_port_group *p;
e8051688 1226 struct net_bridge_port_group __rcu **pp;
dc4eb53a 1227 struct br_ip saddr;
eb1d1641
HX		 1228 unsigned long max_delay;
1229 unsigned long now = jiffies;
1230 __be32 group;
1231
1232 spin_lock(&br->multicast_lock);
1233 if (!netif_running(br->dev) ||
1234 (port && port->state == BR_STATE_DISABLED))
1235 goto out;
1236
eb1d1641
HX		 1237 group = ih->group;
1238
ba5ea614 1239 if (transport_len == sizeof(*ih)) {
eb1d1641
HX		 1240 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1241
1242 if (!max_delay) {
1243 max_delay = 10 * HZ;
1244 group = 0;
1245 }
ba5ea614 1246 } else if (transport_len >= sizeof(*ih3)) {
eb1d1641
HX		 1247 ih3 = igmpv3_query_hdr(skb);
1248 if (ih3->nsrcs)
bec68ff1 1249 goto out;
eb1d1641 1250
0ba8c9ec
YH		 1251 max_delay = ih3->code ?
1252 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
9afd85c9 1253 } else {
9ed973cc
LL		 1254 goto out;
1255 }
1256
dc4eb53a
LL		 1257 if (!group) {
1258 saddr.proto = htons(ETH_P_IP);
1259 saddr.u.ip4 = iph->saddr;
b00589af 1260
dc4eb53a
LL		 1261 br_multicast_query_received(br, port, &br->ip4_other_query,
1262 &saddr, max_delay);
eb1d1641 1263 goto out;
dc4eb53a 1264 }
eb1d1641 1265
19e3a9c9 1266 mp = br_mdb_ip4_get(br, group, vid);
eb1d1641
HX		 1267 if (!mp)
1268 goto out;
1269
1270 max_delay *= br->multicast_last_member_count;
1271
ff0fd34e 1272 if (mp->host_joined &&
eb1d1641
HX		 1273 (timer_pending(&mp->timer) ?
1274 time_after(mp->timer.expires, now + max_delay) :
1275 try_to_del_timer_sync(&mp->timer) >= 0))
1276 mod_timer(&mp->timer, now + max_delay);
1277
e8051688
ED		 1278 for (pp = &mp->ports;
1279 (p = mlock_dereference(*pp, br)) != NULL;
1280 pp = &p->next) {
eb1d1641
HX		 1281 if (timer_pending(&p->timer) ?
1282 time_after(p->timer.expires, now + max_delay) :
1283 try_to_del_timer_sync(&p->timer) >= 0)
24f9cdcb 1284 mod_timer(&p->timer, now + max_delay);
eb1d1641
HX		 1285 }
1286
1287out:
1288 spin_unlock(&br->multicast_lock);
eb1d1641
HX		 1289}
1290
dfd56b8b 1291#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1292static int br_ip6_multicast_query(struct net_bridge *br,
1293 struct net_bridge_port *port,
06499098
VY		 1294 struct sk_buff *skb,
1295 u16 vid)
08b202b6 1296{
ba5ea614 1297 unsigned int transport_len = ipv6_transport_len(skb);
eca2a43b 1298 struct mld_msg *mld;
08b202b6
YH		 1299 struct net_bridge_mdb_entry *mp;
1300 struct mld2_query *mld2q;
e8051688
ED		 1301 struct net_bridge_port_group *p;
1302 struct net_bridge_port_group __rcu **pp;
dc4eb53a 1303 struct br_ip saddr;
08b202b6
YH		 1304 unsigned long max_delay;
1305 unsigned long now = jiffies;
856ce5d0 1306 unsigned int offset = skb_transport_offset(skb);
b71d1d42 1307 const struct in6_addr *group = NULL;
9ed973cc 1308 bool is_general_query;
08b202b6
YH		 1309 int err = 0;
1310
1311 spin_lock(&br->multicast_lock);
1312 if (!netif_running(br->dev) ||
1313 (port && port->state == BR_STATE_DISABLED))
1314 goto out;
1315
ba5ea614 1316 if (transport_len == sizeof(*mld)) {
856ce5d0 1317 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
08b202b6
YH		 1318 err = -EINVAL;
1319 goto out;
1320 }
1321 mld = (struct mld_msg *) icmp6_hdr(skb);
4715213d 1322 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
08b202b6
YH		 1323 if (max_delay)
1324 group = &mld->mld_mca;
248ba8ec 1325 } else {
856ce5d0 1326 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
08b202b6
YH		 1327 err = -EINVAL;
1328 goto out;
1329 }
1330 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1331 if (!mld2q->mld2q_nsrcs)
1332 group = &mld2q->mld2q_mca;
e3f5b170
DB		 1333
1334 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
08b202b6
YH		 1335 }
1336
9ed973cc
LL		 1337 is_general_query = group && ipv6_addr_any(group);
1338
dc4eb53a
LL		 1339 if (is_general_query) {
1340 saddr.proto = htons(ETH_P_IPV6);
3b26a5d0 1341 saddr.u.ip6 = ipv6_hdr(skb)->saddr;
b00589af 1342
dc4eb53a
LL		 1343 br_multicast_query_received(br, port, &br->ip6_other_query,
1344 &saddr, max_delay);
08b202b6 1345 goto out;
6c03ee8b
LL		 1346 } else if (!group) {
1347 goto out;
dc4eb53a 1348 }
08b202b6 1349
19e3a9c9 1350 mp = br_mdb_ip6_get(br, group, vid);
08b202b6
YH		 1351 if (!mp)
1352 goto out;
1353
1354 max_delay *= br->multicast_last_member_count;
ff0fd34e 1355 if (mp->host_joined &&
08b202b6
YH		 1356 (timer_pending(&mp->timer) ?
1357 time_after(mp->timer.expires, now + max_delay) :
1358 try_to_del_timer_sync(&mp->timer) >= 0))
1359 mod_timer(&mp->timer, now + max_delay);
1360
e8051688
ED		 1361 for (pp = &mp->ports;
1362 (p = mlock_dereference(*pp, br)) != NULL;
1363 pp = &p->next) {
08b202b6
YH		 1364 if (timer_pending(&p->timer) ?
1365 time_after(p->timer.expires, now + max_delay) :
1366 try_to_del_timer_sync(&p->timer) >= 0)
24f9cdcb 1367 mod_timer(&p->timer, now + max_delay);
08b202b6
YH		 1368 }
1369
1370out:
1371 spin_unlock(&br->multicast_lock);
1372 return err;
1373}
1374#endif
1375
90010b36
LL		 1376static void
1377br_multicast_leave_group(struct net_bridge *br,
1378 struct net_bridge_port *port,
1379 struct br_ip *group,
1380 struct bridge_mcast_other_query *other_query,
6db6f0ea
FF		 1381 struct bridge_mcast_own_query *own_query,
1382 const unsigned char *src)
eb1d1641 1383{
eb1d1641
HX		 1384 struct net_bridge_mdb_entry *mp;
1385 struct net_bridge_port_group *p;
1386 unsigned long now;
1387 unsigned long time;
1388
eb1d1641
HX		 1389 spin_lock(&br->multicast_lock);
1390 if (!netif_running(br->dev) ||
544586f7 1391 (port && port->state == BR_STATE_DISABLED))
eb1d1641
HX		 1392 goto out;
1393
19e3a9c9 1394 mp = br_mdb_ip_get(br, group);
eb1d1641
HX		 1395 if (!mp)
1396 goto out;
1397
544586f7
SA		 1398 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1399 struct net_bridge_port_group __rcu **pp;
1400
1401 for (pp = &mp->ports;
1402 (p = mlock_dereference(*pp, br)) != NULL;
1403 pp = &p->next) {
6db6f0ea 1404 if (!br_port_group_equal(p, port, src))
544586f7
SA		 1405 continue;
1406
5c725b6b
NA		 1407 if (p->flags & MDB_PG_FLAGS_PERMANENT)
1408 break;
1409
544586f7
SA		 1410 rcu_assign_pointer(*pp, p->next);
1411 hlist_del_init(&p->mglist);
1412 del_timer(&p->timer);
4329596c 1413 kfree_rcu(p, rcu);
45ebcce5 1414 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
3247b272 1415 p->flags | MDB_PG_FLAGS_FAST_LEAVE);
544586f7 1416
ff0fd34e 1417 if (!mp->ports && !mp->host_joined &&
544586f7
SA		 1418 netif_running(br->dev))
1419 mod_timer(&mp->timer, jiffies);
1420 }
1421 goto out;
1422 }
1423
1424 if (timer_pending(&other_query->timer))
1425 goto out;
1426
675779ad 1427 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
6b7df111
CW		 1428 __br_multicast_send_query(br, port, &mp->addr);
1429
1430 time = jiffies + br->multicast_last_member_count *
1431 br->multicast_last_member_interval;
cc0fdd80 1432
90010b36 1433 mod_timer(&own_query->timer, time);
6b7df111
CW		 1434
1435 for (p = mlock_dereference(mp->ports, br);
1436 p != NULL;
1437 p = mlock_dereference(p->next, br)) {
6db6f0ea 1438 if (!br_port_group_equal(p, port, src))
6b7df111
CW		 1439 continue;
1440
1441 if (!hlist_unhashed(&p->mglist) &&
1442 (timer_pending(&p->timer) ?
1443 time_after(p->timer.expires, time) :
1444 try_to_del_timer_sync(&p->timer) >= 0)) {
1445 mod_timer(&p->timer, time);
1446 }
1447
1448 break;
1449 }
1450 }
1451
eb1d1641
HX		 1452 now = jiffies;
1453 time = now + br->multicast_last_member_count *
1454 br->multicast_last_member_interval;
1455
1456 if (!port) {
ff0fd34e 1457 if (mp->host_joined &&
eb1d1641
HX		 1458 (timer_pending(&mp->timer) ?
1459 time_after(mp->timer.expires, time) :
1460 try_to_del_timer_sync(&mp->timer) >= 0)) {
1461 mod_timer(&mp->timer, time);
eb1d1641 1462 }
454594f3
LL		 1463
1464 goto out;
1465 }
1466
1467 for (p = mlock_dereference(mp->ports, br);
1468 p != NULL;
1469 p = mlock_dereference(p->next, br)) {
1470 if (p->port != port)
1471 continue;
1472
1473 if (!hlist_unhashed(&p->mglist) &&
1474 (timer_pending(&p->timer) ?
1475 time_after(p->timer.expires, time) :
1476 try_to_del_timer_sync(&p->timer) >= 0)) {
1477 mod_timer(&p->timer, time);
1478 }
1479
1480 break;
eb1d1641 1481 }
eb1d1641
HX		 1482out:
1483 spin_unlock(&br->multicast_lock);
1484}
1485
8ef2a9a5
YH		 1486static void br_ip4_multicast_leave_group(struct net_bridge *br,
1487 struct net_bridge_port *port,
b0e9a30d 1488 __be32 group,
6db6f0ea
FF		 1489 __u16 vid,
1490 const unsigned char *src)
8ef2a9a5
YH		 1491{
1492 struct br_ip br_group;
90010b36 1493 struct bridge_mcast_own_query *own_query;
8ef2a9a5
YH		 1494
1495 if (ipv4_is_local_multicast(group))
1496 return;
1497
90010b36
LL		 1498 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1499
1515a63f 1500 memset(&br_group, 0, sizeof(br_group));
8ef2a9a5
YH		 1501 br_group.u.ip4 = group;
1502 br_group.proto = htons(ETH_P_IP);
b0e9a30d 1503 br_group.vid = vid;
8ef2a9a5 1504
90010b36 1505 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
6db6f0ea 1506 own_query, src);
8ef2a9a5
YH		 1507}
1508
dfd56b8b 1509#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1510static void br_ip6_multicast_leave_group(struct net_bridge *br,
1511 struct net_bridge_port *port,
b0e9a30d 1512 const struct in6_addr *group,
6db6f0ea
FF		 1513 __u16 vid,
1514 const unsigned char *src)
08b202b6
YH		 1515{
1516 struct br_ip br_group;
90010b36 1517 struct bridge_mcast_own_query *own_query;
08b202b6 1518
3c3769e6 1519 if (ipv6_addr_is_ll_all_nodes(group))
08b202b6
YH		 1520 return;
1521
90010b36
LL		 1522 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1523
1515a63f 1524 memset(&br_group, 0, sizeof(br_group));
4e3fd7a0 1525 br_group.u.ip6 = *group;
08b202b6 1526 br_group.proto = htons(ETH_P_IPV6);
b0e9a30d 1527 br_group.vid = vid;
08b202b6 1528
90010b36 1529 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
6db6f0ea 1530 own_query, src);
08b202b6
YH		 1531}
1532#endif
8ef2a9a5 1533
1080ab95
NA		 1534static void br_multicast_err_count(const struct net_bridge *br,
1535 const struct net_bridge_port *p,
1536 __be16 proto)
1537{
1538 struct bridge_mcast_stats __percpu *stats;
1539 struct bridge_mcast_stats *pstats;
1540
675779ad 1541 if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
1080ab95
NA		 1542 return;
1543
1544 if (p)
1545 stats = p->mcast_stats;
1546 else
1547 stats = br->mcast_stats;
1548 if (WARN_ON(!stats))
1549 return;
1550
1551 pstats = this_cpu_ptr(stats);
1552
1553 u64_stats_update_begin(&pstats->syncp);
1554 switch (proto) {
1555 case htons(ETH_P_IP):
1556 pstats->mstats.igmp_parse_errors++;
1557 break;
1558#if IS_ENABLED(CONFIG_IPV6)
1559 case htons(ETH_P_IPV6):
1560 pstats->mstats.mld_parse_errors++;
1561 break;
1562#endif
1563 }
1564 u64_stats_update_end(&pstats->syncp);
1565}
1566
91b02d3d
NA		 1567static void br_multicast_pim(struct net_bridge *br,
1568 struct net_bridge_port *port,
1569 const struct sk_buff *skb)
1570{
1571 unsigned int offset = skb_transport_offset(skb);
1572 struct pimhdr *pimhdr, _pimhdr;
1573
1574 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1575 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1576 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1577 return;
1578
1579 br_multicast_mark_router(br, port);
1580}
1581
4b3087c7
LL		 1582static int br_ip4_multicast_mrd_rcv(struct net_bridge *br,
1583 struct net_bridge_port *port,
1584 struct sk_buff *skb)
1585{
1586 if (ip_hdr(skb)->protocol != IPPROTO_IGMP ||
1587 igmp_hdr(skb)->type != IGMP_MRDISC_ADV)
1588 return -ENOMSG;
1589
1590 br_multicast_mark_router(br, port);
1591
1592 return 0;
1593}
1594
eb1d1641
HX		 1595static int br_multicast_ipv4_rcv(struct net_bridge *br,
1596 struct net_bridge_port *port,
06499098
VY		 1597 struct sk_buff *skb,
1598 u16 vid)
eb1d1641 1599{
6db6f0ea 1600 const unsigned char *src;
eb1d1641 1601 struct igmphdr *ih;
eb1d1641
HX		 1602 int err;
1603
ba5ea614 1604 err = ip_mc_check_igmp(skb);
eb1d1641 1605
9afd85c9 1606 if (err == -ENOMSG) {
91b02d3d 1607 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
bd4265fe 1608 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
91b02d3d
NA		 1609 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1610 if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1611 br_multicast_pim(br, port, skb);
4b3087c7 1612 } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) {
08e71623 1613 br_ip4_multicast_mrd_rcv(br, port, skb);
91b02d3d 1614 }
4b3087c7 1615
eb1d1641 1616 return 0;
9afd85c9 1617 } else if (err < 0) {
1080ab95 1618 br_multicast_err_count(br, port, skb->protocol);
9afd85c9 1619 return err;
bd4265fe 1620 }
eb1d1641 1621
9afd85c9 1622 ih = igmp_hdr(skb);
6db6f0ea 1623 src = eth_hdr(skb)->h_source;
1080ab95 1624 BR_INPUT_SKB_CB(skb)->igmp = ih->type;
eb1d1641
HX		 1625
1626 switch (ih->type) {
1627 case IGMP_HOST_MEMBERSHIP_REPORT:
1628 case IGMPV2_HOST_MEMBERSHIP_REPORT:
62b2bcb4 1629 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
6db6f0ea 1630 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
eb1d1641
HX		 1631 break;
1632 case IGMPV3_HOST_MEMBERSHIP_REPORT:
ba5ea614 1633 err = br_ip4_multicast_igmp3_report(br, port, skb, vid);
eb1d1641
HX		 1634 break;
1635 case IGMP_HOST_MEMBERSHIP_QUERY:
ba5ea614 1636 br_ip4_multicast_query(br, port, skb, vid);
eb1d1641
HX		 1637 break;
1638 case IGMP_HOST_LEAVE_MESSAGE:
6db6f0ea 1639 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
eb1d1641
HX		 1640 break;
1641 }
1642
a65056ec 1643 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1080ab95
NA		 1644 BR_MCAST_DIR_RX);
1645
eb1d1641
HX		 1646 return err;
1647}
1648
dfd56b8b 1649#if IS_ENABLED(CONFIG_IPV6)
4b3087c7
LL		 1650static int br_ip6_multicast_mrd_rcv(struct net_bridge *br,
1651 struct net_bridge_port *port,
1652 struct sk_buff *skb)
1653{
1654 int ret;
1655
1656 if (ipv6_hdr(skb)->nexthdr != IPPROTO_ICMPV6)
1657 return -ENOMSG;
1658
1659 ret = ipv6_mc_check_icmpv6(skb);
1660 if (ret < 0)
1661 return ret;
1662
1663 if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV)
1664 return -ENOMSG;
1665
1666 br_multicast_mark_router(br, port);
1667
1668 return 0;
1669}
1670
08b202b6
YH		 1671static int br_multicast_ipv6_rcv(struct net_bridge *br,
1672 struct net_bridge_port *port,
06499098
VY		 1673 struct sk_buff *skb,
1674 u16 vid)
08b202b6 1675{
6db6f0ea 1676 const unsigned char *src;
9afd85c9 1677 struct mld_msg *mld;
08b202b6
YH		 1678 int err;
1679
ba5ea614 1680 err = ipv6_mc_check_mld(skb);
08b202b6 1681
9afd85c9
LL		 1682 if (err == -ENOMSG) {
1683 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1684 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
4b3087c7
LL		 1685
1686 if (ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr)) {
1687 err = br_ip6_multicast_mrd_rcv(br, port, skb);
1688
1689 if (err < 0 && err != -ENOMSG) {
1690 br_multicast_err_count(br, port, skb->protocol);
1691 return err;
1692 }
1693 }
1694
08b202b6 1695 return 0;
9afd85c9 1696 } else if (err < 0) {
1080ab95 1697 br_multicast_err_count(br, port, skb->protocol);
9afd85c9 1698 return err;
08b202b6
YH		 1699 }
1700
9afd85c9 1701 mld = (struct mld_msg *)skb_transport_header(skb);
1080ab95 1702 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
08b202b6 1703
9afd85c9 1704 switch (mld->mld_type) {
08b202b6 1705 case ICMPV6_MGM_REPORT:
6db6f0ea 1706 src = eth_hdr(skb)->h_source;
fc2af6c7 1707 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
6db6f0ea
FF		 1708 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
1709 src);
08b202b6 1710 break;
08b202b6 1711 case ICMPV6_MLD2_REPORT:
ba5ea614 1712 err = br_ip6_multicast_mld2_report(br, port, skb, vid);
08b202b6
YH		 1713 break;
1714 case ICMPV6_MGM_QUERY:
ba5ea614 1715 err = br_ip6_multicast_query(br, port, skb, vid);
08b202b6
YH		 1716 break;
1717 case ICMPV6_MGM_REDUCTION:
6db6f0ea
FF		 1718 src = eth_hdr(skb)->h_source;
1719 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
9afd85c9 1720 break;
08b202b6
YH		 1721 }
1722
a65056ec 1723 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1080ab95
NA		 1724 BR_MCAST_DIR_RX);
1725
08b202b6
YH		 1726 return err;
1727}
1728#endif
1729
eb1d1641 1730int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
06499098 1731 struct sk_buff *skb, u16 vid)
eb1d1641 1732{
1080ab95
NA		 1733 int ret = 0;
1734
1fafc7a9
YH		 1735 BR_INPUT_SKB_CB(skb)->igmp = 0;
1736 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1737
13cefad2 1738 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
eb1d1641
HX		 1739 return 0;
1740
1741 switch (skb->protocol) {
1742 case htons(ETH_P_IP):
1080ab95
NA		 1743 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1744 break;
dfd56b8b 1745#if IS_ENABLED(CONFIG_IPV6)
08b202b6 1746 case htons(ETH_P_IPV6):
1080ab95
NA		 1747 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1748 break;
08b202b6 1749#endif
eb1d1641
HX		 1750 }
1751
1080ab95 1752 return ret;
eb1d1641
HX		 1753}
1754
cc0fdd80 1755static void br_multicast_query_expired(struct net_bridge *br,
2cd41431
LL		 1756 struct bridge_mcast_own_query *query,
1757 struct bridge_mcast_querier *querier)
cc0fdd80
LL		 1758{
1759 spin_lock(&br->multicast_lock);
1760 if (query->startup_sent < br->multicast_startup_query_count)
1761 query->startup_sent++;
1762
71d9f614 1763 RCU_INIT_POINTER(querier->port, NULL);
cc0fdd80
LL		 1764 br_multicast_send_query(br, NULL, query);
1765 spin_unlock(&br->multicast_lock);
1766}
1767
88c1f37f 1768static void br_ip4_multicast_query_expired(struct timer_list *t)
eb1d1641 1769{
88c1f37f 1770 struct net_bridge *br = from_timer(br, t, ip4_own_query.timer);
eb1d1641 1771
2cd41431 1772 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
cc0fdd80 1773}
eb1d1641 1774
cc0fdd80 1775#if IS_ENABLED(CONFIG_IPV6)
88c1f37f 1776static void br_ip6_multicast_query_expired(struct timer_list *t)
cc0fdd80 1777{
88c1f37f 1778 struct net_bridge *br = from_timer(br, t, ip6_own_query.timer);
eb1d1641 1779
2cd41431 1780 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
eb1d1641 1781}
cc0fdd80 1782#endif
eb1d1641
HX		 1783
1784void br_multicast_init(struct net_bridge *br)
1785{
d08c6bc0 1786 br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX;
eb1d1641 1787
7f0aec7a 1788 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
eb1d1641
HX		 1789 br->multicast_last_member_count = 2;
1790 br->multicast_startup_query_count = 2;
1791
1792 br->multicast_last_member_interval = HZ;
1793 br->multicast_query_response_interval = 10 * HZ;
1794 br->multicast_startup_query_interval = 125 * HZ / 4;
1795 br->multicast_query_interval = 125 * HZ;
1796 br->multicast_querier_interval = 255 * HZ;
1797 br->multicast_membership_interval = 260 * HZ;
1798
90010b36 1799 br->ip4_other_query.delay_time = 0;
2cd41431 1800 br->ip4_querier.port = NULL;
aa2ae3e7 1801 br->multicast_igmp_version = 2;
cc0fdd80 1802#if IS_ENABLED(CONFIG_IPV6)
aa2ae3e7 1803 br->multicast_mld_version = 1;
90010b36 1804 br->ip6_other_query.delay_time = 0;
2cd41431 1805 br->ip6_querier.port = NULL;
cc0fdd80 1806#endif
6919622a 1807 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true);
675779ad 1808 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
b00589af 1809
eb1d1641 1810 spin_lock_init(&br->multicast_lock);
88c1f37f
AP		 1811 timer_setup(&br->multicast_router_timer,
1812 br_multicast_local_router_expired, 0);
1813 timer_setup(&br->ip4_other_query.timer,
1814 br_ip4_multicast_querier_expired, 0);
1815 timer_setup(&br->ip4_own_query.timer,
1816 br_ip4_multicast_query_expired, 0);
cc0fdd80 1817#if IS_ENABLED(CONFIG_IPV6)
88c1f37f
AP		 1818 timer_setup(&br->ip6_other_query.timer,
1819 br_ip6_multicast_querier_expired, 0);
1820 timer_setup(&br->ip6_own_query.timer,
1821 br_ip6_multicast_query_expired, 0);
cc0fdd80 1822#endif
19e3a9c9 1823 INIT_HLIST_HEAD(&br->mdb_list);
eb1d1641
HX		 1824}
1825
4effd28c
LL		 1826static void br_ip4_multicast_join_snoopers(struct net_bridge *br)
1827{
1828 struct in_device *in_dev = in_dev_get(br->dev);
1829
1830 if (!in_dev)
1831 return;
1832
9fb20801 1833 __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
4effd28c
LL		 1834 in_dev_put(in_dev);
1835}
1836
1837#if IS_ENABLED(CONFIG_IPV6)
1838static void br_ip6_multicast_join_snoopers(struct net_bridge *br)
1839{
1840 struct in6_addr addr;
1841
1842 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
1843 ipv6_dev_mc_inc(br->dev, &addr);
1844}
1845#else
1846static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br)
1847{
1848}
1849#endif
1850
1851static void br_multicast_join_snoopers(struct net_bridge *br)
1852{
1853 br_ip4_multicast_join_snoopers(br);
1854 br_ip6_multicast_join_snoopers(br);
1855}
1856
1857static void br_ip4_multicast_leave_snoopers(struct net_bridge *br)
1858{
1859 struct in_device *in_dev = in_dev_get(br->dev);
1860
1861 if (WARN_ON(!in_dev))
1862 return;
1863
9fb20801 1864 __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
4effd28c
LL		 1865 in_dev_put(in_dev);
1866}
1867
1868#if IS_ENABLED(CONFIG_IPV6)
1869static void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
1870{
1871 struct in6_addr addr;
1872
1873 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
1874 ipv6_dev_mc_dec(br->dev, &addr);
1875}
1876#else
1877static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
1878{
1879}
1880#endif
1881
1882static void br_multicast_leave_snoopers(struct net_bridge *br)
1883{
1884 br_ip4_multicast_leave_snoopers(br);
1885 br_ip6_multicast_leave_snoopers(br);
1886}
1887
cc0fdd80 1888static void __br_multicast_open(struct net_bridge *br,
90010b36 1889 struct bridge_mcast_own_query *query)
eb1d1641 1890{
cc0fdd80 1891 query->startup_sent = 0;
eb1d1641 1892
13cefad2 1893 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
eb1d1641
HX		 1894 return;
1895
cc0fdd80
LL		 1896 mod_timer(&query->timer, jiffies);
1897}
1898
1899void br_multicast_open(struct net_bridge *br)
1900{
4effd28c
LL		 1901 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
1902 br_multicast_join_snoopers(br);
1903
90010b36 1904 __br_multicast_open(br, &br->ip4_own_query);
cc0fdd80 1905#if IS_ENABLED(CONFIG_IPV6)
90010b36 1906 __br_multicast_open(br, &br->ip6_own_query);
cc0fdd80 1907#endif
eb1d1641
HX		 1908}
1909
1910void br_multicast_stop(struct net_bridge *br)
1911{
eb1d1641 1912 del_timer_sync(&br->multicast_router_timer);
90010b36
LL		 1913 del_timer_sync(&br->ip4_other_query.timer);
1914 del_timer_sync(&br->ip4_own_query.timer);
cc0fdd80 1915#if IS_ENABLED(CONFIG_IPV6)
90010b36
LL		 1916 del_timer_sync(&br->ip6_other_query.timer);
1917 del_timer_sync(&br->ip6_own_query.timer);
cc0fdd80 1918#endif
4effd28c
LL		 1919
1920 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
1921 br_multicast_leave_snoopers(br);
e10177ab
SA		 1922}
1923
1924void br_multicast_dev_del(struct net_bridge *br)
1925{
e10177ab 1926 struct net_bridge_mdb_entry *mp;
19e3a9c9 1927 struct hlist_node *tmp;
eb1d1641
HX		 1928
1929 spin_lock_bh(&br->multicast_lock);
19e3a9c9
NA		 1930 hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node) {
1931 del_timer(&mp->timer);
1932 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
1933 br_mdb_rht_params);
1934 hlist_del_rcu(&mp->mdb_node);
4329596c 1935 kfree_rcu(mp, rcu);
eb1d1641 1936 }
eb1d1641 1937 spin_unlock_bh(&br->multicast_lock);
19e3a9c9 1938
4329596c 1939 rcu_barrier();
eb1d1641 1940}
0909e117
HX		 1941
1942int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1943{
6ae4ae8e 1944 int err = -EINVAL;
0909e117
HX		 1945
1946 spin_lock_bh(&br->multicast_lock);
0909e117
HX		 1947
1948 switch (val) {
7f0aec7a
NA		 1949 case MDB_RTR_TYPE_DISABLED:
1950 case MDB_RTR_TYPE_PERM:
77041420 1951 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM);
0909e117 1952 del_timer(&br->multicast_router_timer);
77041420
YG		 1953 br->multicast_router = val;
1954 err = 0;
1955 break;
7f0aec7a 1956 case MDB_RTR_TYPE_TEMP_QUERY:
77041420
YG		 1957 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
1958 br_mc_router_state_change(br, false);
0909e117
HX		 1959 br->multicast_router = val;
1960 err = 0;
1961 break;
0909e117
HX		 1962 }
1963
0909e117
HX		 1964 spin_unlock_bh(&br->multicast_lock);
1965
1966 return err;
1967}
1968
7f0aec7a
NA		 1969static void __del_port_router(struct net_bridge_port *p)
1970{
1971 if (hlist_unhashed(&p->rlist))
1972 return;
1973 hlist_del_init_rcu(&p->rlist);
1974 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
6d549648 1975 br_port_mc_router_state_change(p, false);
f12e7d95
NF		 1976
1977 /* don't allow timer refresh */
1978 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1979 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
7f0aec7a
NA		 1980}
1981
0909e117
HX		 1982int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1983{
1984 struct net_bridge *br = p->br;
a55d8246 1985 unsigned long now = jiffies;
6ae4ae8e 1986 int err = -EINVAL;
0909e117
HX		 1987
1988 spin_lock(&br->multicast_lock);
4950cfd1 1989 if (p->multicast_router == val) {
a55d8246
NA		 1990 /* Refresh the temp router port timer */
1991 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1992 mod_timer(&p->multicast_router_timer,
1993 now + br->multicast_querier_interval);
4950cfd1
NA		 1994 err = 0;
1995 goto unlock;
1996 }
0909e117 1997 switch (val) {
7f0aec7a
NA		 1998 case MDB_RTR_TYPE_DISABLED:
1999 p->multicast_router = MDB_RTR_TYPE_DISABLED;
2000 __del_port_router(p);
2001 del_timer(&p->multicast_router_timer);
2002 break;
2003 case MDB_RTR_TYPE_TEMP_QUERY:
2004 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2005 __del_port_router(p);
2006 break;
2007 case MDB_RTR_TYPE_PERM:
2008 p->multicast_router = MDB_RTR_TYPE_PERM;
0909e117 2009 del_timer(&p->multicast_router_timer);
0909e117
HX		 2010 br_multicast_add_router(br, p);
2011 break;
a55d8246
NA		 2012 case MDB_RTR_TYPE_TEMP:
2013 p->multicast_router = MDB_RTR_TYPE_TEMP;
2014 br_multicast_mark_router(br, p);
2015 break;
7f0aec7a
NA		 2016 default:
2017 goto unlock;
0909e117 2018 }
7f0aec7a
NA		 2019 err = 0;
2020unlock:
0909e117
HX		 2021 spin_unlock(&br->multicast_lock);
2022
2023 return err;
2024}
561f1103 2025
cc0fdd80 2026static void br_multicast_start_querier(struct net_bridge *br,
90010b36 2027 struct bridge_mcast_own_query *query)
561f1103
HX		 2028{
2029 struct net_bridge_port *port;
74857216 2030
cc0fdd80 2031 __br_multicast_open(br, query);
74857216 2032
c5b493ce
NA		 2033 rcu_read_lock();
2034 list_for_each_entry_rcu(port, &br->port_list, list) {
74857216
HX		 2035 if (port->state == BR_STATE_DISABLED ||
2036 port->state == BR_STATE_BLOCKING)
2037 continue;
2038
90010b36
LL		 2039 if (query == &br->ip4_own_query)
2040 br_multicast_enable(&port->ip4_own_query);
cc0fdd80
LL		 2041#if IS_ENABLED(CONFIG_IPV6)
2042 else
90010b36 2043 br_multicast_enable(&port->ip6_own_query);
cc0fdd80 2044#endif
74857216 2045 }
c5b493ce 2046 rcu_read_unlock();
74857216
HX		 2047}
2048
2049int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2050{
7cb3f921 2051 struct net_bridge_port *port;
561f1103 2052
ef5e0d82 2053 spin_lock_bh(&br->multicast_lock);
13cefad2 2054 if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val)
561f1103
HX		 2055 goto unlock;
2056
13cefad2
NA		 2057 br_mc_disabled_update(br->dev, val);
2058 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val);
4effd28c
LL		 2059 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) {
2060 br_multicast_leave_snoopers(br);
561f1103 2061 goto unlock;
4effd28c 2062 }
561f1103 2063
3a7fda06
HX		 2064 if (!netif_running(br->dev))
2065 goto unlock;
2066
7cb3f921
NA		 2067 br_multicast_open(br);
2068 list_for_each_entry(port, &br->port_list, list)
2069 __br_multicast_enable_port(port);
561f1103
HX		 2070
2071unlock:
ef5e0d82 2072 spin_unlock_bh(&br->multicast_lock);
561f1103 2073
a26d94bf 2074 return 0;
561f1103 2075}
b195167f 2076
9341b988
IS		 2077bool br_multicast_enabled(const struct net_device *dev)
2078{
2079 struct net_bridge *br = netdev_priv(dev);
2080
13cefad2 2081 return !!br_opt_get(br, BROPT_MULTICAST_ENABLED);
9341b988
IS		 2082}
2083EXPORT_SYMBOL_GPL(br_multicast_enabled);
2084
0912bda4
YG		 2085bool br_multicast_router(const struct net_device *dev)
2086{
2087 struct net_bridge *br = netdev_priv(dev);
2088 bool is_router;
2089
2090 spin_lock_bh(&br->multicast_lock);
2091 is_router = br_multicast_is_router(br);
2092 spin_unlock_bh(&br->multicast_lock);
2093 return is_router;
2094}
2095EXPORT_SYMBOL_GPL(br_multicast_router);
2096
c5c23260
HX		 2097int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2098{
b00589af
LL		 2099 unsigned long max_delay;
2100
c5c23260
HX		 2101 val = !!val;
2102
2103 spin_lock_bh(&br->multicast_lock);
675779ad 2104 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val)
c5c23260
HX		 2105 goto unlock;
2106
675779ad 2107 br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val);
b00589af
LL		 2108 if (!val)
2109 goto unlock;
2110
2111 max_delay = br->multicast_query_response_interval;
b00589af 2112
90010b36
LL		 2113 if (!timer_pending(&br->ip4_other_query.timer))
2114 br->ip4_other_query.delay_time = jiffies + max_delay;
cc0fdd80 2115
90010b36 2116 br_multicast_start_querier(br, &br->ip4_own_query);
cc0fdd80
LL		 2117
2118#if IS_ENABLED(CONFIG_IPV6)
90010b36
LL		 2119 if (!timer_pending(&br->ip6_other_query.timer))
2120 br->ip6_other_query.delay_time = jiffies + max_delay;
cc0fdd80 2121
90010b36 2122 br_multicast_start_querier(br, &br->ip6_own_query);
cc0fdd80 2123#endif
c5c23260
HX		 2124
2125unlock:
2126 spin_unlock_bh(&br->multicast_lock);
2127
2128 return 0;
2129}
2130
5e923585
NA		 2131int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2132{
2133 /* Currently we support only version 2 and 3 */
2134 switch (val) {
2135 case 2:
2136 case 3:
2137 break;
2138 default:
2139 return -EINVAL;
2140 }
2141
2142 spin_lock_bh(&br->multicast_lock);
2143 br->multicast_igmp_version = val;
2144 spin_unlock_bh(&br->multicast_lock);
2145
2146 return 0;
2147}
2148
aa2ae3e7
NA		 2149#if IS_ENABLED(CONFIG_IPV6)
2150int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2151{
2152 /* Currently we support version 1 and 2 */
2153 switch (val) {
2154 case 1:
2155 case 2:
2156 break;
2157 default:
2158 return -EINVAL;
2159 }
2160
2161 spin_lock_bh(&br->multicast_lock);
2162 br->multicast_mld_version = val;
2163 spin_unlock_bh(&br->multicast_lock);
2164
2165 return 0;
2166}
2167#endif
2168
07f8ac4a
LL		 2169/**
2170 * br_multicast_list_adjacent - Returns snooped multicast addresses
2171 * @dev: The bridge port adjacent to which to retrieve addresses
2172 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2173 *
2174 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2175 * snooping feature on all bridge ports of dev's bridge device, excluding
2176 * the addresses from dev itself.
2177 *
2178 * Returns the number of items added to br_ip_list.
2179 *
2180 * Notes:
2181 * - br_ip_list needs to be initialized by caller
2182 * - br_ip_list might contain duplicates in the end
2183 * (needs to be taken care of by caller)
2184 * - br_ip_list needs to be freed by caller
2185 */
2186int br_multicast_list_adjacent(struct net_device *dev,
2187 struct list_head *br_ip_list)
2188{
2189 struct net_bridge *br;
2190 struct net_bridge_port *port;
2191 struct net_bridge_port_group *group;
2192 struct br_ip_list *entry;
2193 int count = 0;
2194
2195 rcu_read_lock();
35f861e3 2196 if (!br_ip_list || !netif_is_bridge_port(dev))
07f8ac4a
LL		 2197 goto unlock;
2198
2199 port = br_port_get_rcu(dev);
2200 if (!port || !port->br)
2201 goto unlock;
2202
2203 br = port->br;
2204
2205 list_for_each_entry_rcu(port, &br->port_list, list) {
2206 if (!port->dev || port->dev == dev)
2207 continue;
2208
2209 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2210 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2211 if (!entry)
2212 goto unlock;
2213
2214 entry->addr = group->addr;
2215 list_add(&entry->list, br_ip_list);
2216 count++;
2217 }
2218 }
2219
2220unlock:
2221 rcu_read_unlock();
2222 return count;
2223}
2224EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2cd41431 2225
c34963e2
LL		 2226/**
2227 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2228 * @dev: The bridge port providing the bridge on which to check for a querier
2229 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2230 *
2231 * Checks whether the given interface has a bridge on top and if so returns
2232 * true if a valid querier exists anywhere on the bridged link layer.
2233 * Otherwise returns false.
2234 */
2235bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2236{
2237 struct net_bridge *br;
2238 struct net_bridge_port *port;
2239 struct ethhdr eth;
2240 bool ret = false;
2241
2242 rcu_read_lock();
35f861e3 2243 if (!netif_is_bridge_port(dev))
c34963e2
LL		 2244 goto unlock;
2245
2246 port = br_port_get_rcu(dev);
2247 if (!port || !port->br)
2248 goto unlock;
2249
2250 br = port->br;
2251
2252 memset(&eth, 0, sizeof(eth));
2253 eth.h_proto = htons(proto);
2254
2255 ret = br_multicast_querier_exists(br, &eth);
2256
2257unlock:
2258 rcu_read_unlock();
2259 return ret;
2260}
2261EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2262
2cd41431
LL		 2263/**
2264 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2265 * @dev: The bridge port adjacent to which to check for a querier
2266 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2267 *
2268 * Checks whether the given interface has a bridge on top and if so returns
2269 * true if a selected querier is behind one of the other ports of this
2270 * bridge. Otherwise returns false.
2271 */
2272bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2273{
2274 struct net_bridge *br;
2275 struct net_bridge_port *port;
2276 bool ret = false;
2277
2278 rcu_read_lock();
35f861e3 2279 if (!netif_is_bridge_port(dev))
2cd41431
LL		 2280 goto unlock;
2281
2282 port = br_port_get_rcu(dev);
2283 if (!port || !port->br)
2284 goto unlock;
2285
2286 br = port->br;
2287
2288 switch (proto) {
2289 case ETH_P_IP:
2290 if (!timer_pending(&br->ip4_other_query.timer) ||
2291 rcu_dereference(br->ip4_querier.port) == port)
2292 goto unlock;
2293 break;
3993c4e1 2294#if IS_ENABLED(CONFIG_IPV6)
2cd41431
LL		 2295 case ETH_P_IPV6:
2296 if (!timer_pending(&br->ip6_other_query.timer) ||
2297 rcu_dereference(br->ip6_querier.port) == port)
2298 goto unlock;
2299 break;
3993c4e1 2300#endif
2cd41431
LL		 2301 default:
2302 goto unlock;
2303 }
2304
2305 ret = true;
2306unlock:
2307 rcu_read_unlock();
2308 return ret;
2309}
2310EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
1080ab95
NA		 2311
2312static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
a65056ec 2313 const struct sk_buff *skb, u8 type, u8 dir)
1080ab95
NA		 2314{
2315 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
a65056ec
NA		 2316 __be16 proto = skb->protocol;
2317 unsigned int t_len;
1080ab95
NA		 2318
2319 u64_stats_update_begin(&pstats->syncp);
2320 switch (proto) {
2321 case htons(ETH_P_IP):
a65056ec 2322 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
1080ab95
NA		 2323 switch (type) {
2324 case IGMP_HOST_MEMBERSHIP_REPORT:
2325 pstats->mstats.igmp_v1reports[dir]++;
2326 break;
2327 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2328 pstats->mstats.igmp_v2reports[dir]++;
2329 break;
2330 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2331 pstats->mstats.igmp_v3reports[dir]++;
2332 break;
2333 case IGMP_HOST_MEMBERSHIP_QUERY:
a65056ec
NA		 2334 if (t_len != sizeof(struct igmphdr)) {
2335 pstats->mstats.igmp_v3queries[dir]++;
2336 } else {
2337 unsigned int offset = skb_transport_offset(skb);
2338 struct igmphdr *ih, _ihdr;
2339
2340 ih = skb_header_pointer(skb, offset,
2341 sizeof(_ihdr), &_ihdr);
2342 if (!ih)
2343 break;
2344 if (!ih->code)
2345 pstats->mstats.igmp_v1queries[dir]++;
2346 else
2347 pstats->mstats.igmp_v2queries[dir]++;
2348 }
1080ab95
NA		 2349 break;
2350 case IGMP_HOST_LEAVE_MESSAGE:
2351 pstats->mstats.igmp_leaves[dir]++;
2352 break;
2353 }
2354 break;
2355#if IS_ENABLED(CONFIG_IPV6)
2356 case htons(ETH_P_IPV6):
a65056ec
NA		 2357 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2358 sizeof(struct ipv6hdr);
2359 t_len -= skb_network_header_len(skb);
1080ab95
NA		 2360 switch (type) {
2361 case ICMPV6_MGM_REPORT:
2362 pstats->mstats.mld_v1reports[dir]++;
2363 break;
2364 case ICMPV6_MLD2_REPORT:
2365 pstats->mstats.mld_v2reports[dir]++;
2366 break;
2367 case ICMPV6_MGM_QUERY:
a65056ec
NA		 2368 if (t_len != sizeof(struct mld_msg))
2369 pstats->mstats.mld_v2queries[dir]++;
2370 else
2371 pstats->mstats.mld_v1queries[dir]++;
1080ab95
NA		 2372 break;
2373 case ICMPV6_MGM_REDUCTION:
2374 pstats->mstats.mld_leaves[dir]++;
2375 break;
2376 }
2377 break;
2378#endif /* CONFIG_IPV6 */
2379 }
2380 u64_stats_update_end(&pstats->syncp);
2381}
2382
2383void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
a65056ec 2384 const struct sk_buff *skb, u8 type, u8 dir)
1080ab95
NA		 2385{
2386 struct bridge_mcast_stats __percpu *stats;
2387
2388 /* if multicast_disabled is true then igmp type can't be set */
675779ad 2389 if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
1080ab95
NA		 2390 return;
2391
2392 if (p)
2393 stats = p->mcast_stats;
2394 else
2395 stats = br->mcast_stats;
2396 if (WARN_ON(!stats))
2397 return;
2398
a65056ec 2399 br_mcast_stats_add(stats, skb, type, dir);
1080ab95
NA		 2400}
2401
2402int br_multicast_init_stats(struct net_bridge *br)
2403{
2404 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2405 if (!br->mcast_stats)
2406 return -ENOMEM;
2407
2408 return 0;
2409}
2410
b6fe0440
IS		 2411void br_multicast_uninit_stats(struct net_bridge *br)
2412{
2413 free_percpu(br->mcast_stats);
2414}
2415
b3b6a84c
AB		 2416/* noinline for https://bugs.llvm.org/show_bug.cgi?id=45802#c9 */
2417static noinline_for_stack void mcast_stats_add_dir(u64 *dst, u64 *src)
1080ab95
NA		 2418{
2419 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2420 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2421}
2422
2423void br_multicast_get_stats(const struct net_bridge *br,
2424 const struct net_bridge_port *p,
2425 struct br_mcast_stats *dest)
2426{
2427 struct bridge_mcast_stats __percpu *stats;
2428 struct br_mcast_stats tdst;
2429 int i;
2430
2431 memset(dest, 0, sizeof(*dest));
2432 if (p)
2433 stats = p->mcast_stats;
2434 else
2435 stats = br->mcast_stats;
2436 if (WARN_ON(!stats))
2437 return;
2438
2439 memset(&tdst, 0, sizeof(tdst));
2440 for_each_possible_cpu(i) {
2441 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2442 struct br_mcast_stats temp;
2443 unsigned int start;
2444
2445 do {
2446 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2447 memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2448 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2449
a65056ec
NA		 2450 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2451 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2452 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
1080ab95
NA		 2453 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2454 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2455 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2456 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2457 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2458
a65056ec
NA		 2459 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2460 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
1080ab95
NA		 2461 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2462 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2463 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2464 tdst.mld_parse_errors += temp.mld_parse_errors;
2465 }
2466 memcpy(dest, &tdst, sizeof(*dest));
2467}
19e3a9c9
NA		 2468
2469int br_mdb_hash_init(struct net_bridge *br)
2470{
2471 return rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params);
2472}
2473
2474void br_mdb_hash_fini(struct net_bridge *br)
2475{
2476 rhashtable_destroy(&br->mdb_hash_tbl);
2477}
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