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net: remove unneeded switch fall-through
[thirdparty/kernel/stable.git] / net / bridge / br_multicast.c
CommitLineData
eb1d1641
HX		 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>
07f8ac4a 14#include <linux/export.h>
eb1d1641
HX		 15#include <linux/if_ether.h>
16#include <linux/igmp.h>
4b3087c7 17#include <linux/in.h>
eb1d1641
HX		 18#include <linux/jhash.h>
19#include <linux/kernel.h>
b195167f 20#include <linux/log2.h>
eb1d1641
HX		 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>
1c8ad5bf 28#include <linux/inetdevice.h>
91b02d3d 29#include <linux/mroute.h>
eb1d1641 30#include <net/ip.h>
147c1e9b 31#include <net/switchdev.h>
dfd56b8b 32#if IS_ENABLED(CONFIG_IPV6)
4b3087c7 33#include <linux/icmpv6.h>
08b202b6
YH		 34#include <net/ipv6.h>
35#include <net/mld.h>
d4c4f07d 36#include <net/ip6_checksum.h>
3c3769e6 37#include <net/addrconf.h>
08b202b6 38#endif
eb1d1641
HX		 39
40#include "br_private.h"
41
19e3a9c9
NA		 42static 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
cc0fdd80 50static void br_multicast_start_querier(struct net_bridge *br,
90010b36 51 struct bridge_mcast_own_query *query);
754bc547
SA		 52static void br_multicast_add_router(struct net_bridge *br,
53 struct net_bridge_port *port);
bc8c20ac
SA		 54static void br_ip4_multicast_leave_group(struct net_bridge *br,
55 struct net_bridge_port *port,
56 __be32 group,
6db6f0ea
FF		 57 __u16 vid,
58 const unsigned char *src);
59
f12e7d95 60static void __del_port_router(struct net_bridge_port *p);
bc8c20ac
SA		 61#if IS_ENABLED(CONFIG_IPV6)
62static void br_ip6_multicast_leave_group(struct net_bridge *br,
63 struct net_bridge_port *port,
64 const struct in6_addr *group,
6db6f0ea 65 __u16 vid, const unsigned char *src);
bc8c20ac 66#endif
c83b8fab 67
8ef2a9a5
YH		 68static 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;
b0e9a30d
VY		 72 if (a->vid != b->vid)
73 return 0;
8ef2a9a5
YH		 74 switch (a->proto) {
75 case htons(ETH_P_IP):
76 return a->u.ip4 == b->u.ip4;
dfd56b8b 77#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 78 case htons(ETH_P_IPV6):
79 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
80#endif
8ef2a9a5
YH		 81 }
82 return 0;
83}
84
19e3a9c9
NA		 85static struct net_bridge_mdb_entry *br_mdb_ip_get_rcu(struct net_bridge *br,
86 struct br_ip *dst)
08b202b6 87{
19e3a9c9 88 return rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
08b202b6 89}
08b202b6 90
19e3a9c9
NA		 91struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge *br,
92 struct br_ip *dst)
eb1d1641 93{
19e3a9c9 94 struct net_bridge_mdb_entry *ent;
eb1d1641 95
19e3a9c9 96 lockdep_assert_held_once(&br->multicast_lock);
eb1d1641 97
19e3a9c9
NA		 98 rcu_read_lock();
99 ent = rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
100 rcu_read_unlock();
7f285fa7 101
19e3a9c9 102 return ent;
7f285fa7
HX		 103}
104
19e3a9c9
NA		 105static struct net_bridge_mdb_entry *br_mdb_ip4_get(struct net_bridge *br,
106 __be32 dst, __u16 vid)
eb1d1641 107{
8ef2a9a5
YH		 108 struct br_ip br_dst;
109
19e3a9c9 110 memset(&br_dst, 0, sizeof(br_dst));
8ef2a9a5
YH		 111 br_dst.u.ip4 = dst;
112 br_dst.proto = htons(ETH_P_IP);
b0e9a30d 113 br_dst.vid = vid;
0821ec55 114
19e3a9c9 115 return br_mdb_ip_get(br, &br_dst);
8ef2a9a5
YH		 116}
117
dfd56b8b 118#if IS_ENABLED(CONFIG_IPV6)
19e3a9c9
NA		 119static struct net_bridge_mdb_entry *br_mdb_ip6_get(struct net_bridge *br,
120 const struct in6_addr *dst,
121 __u16 vid)
08b202b6
YH		 122{
123 struct br_ip br_dst;
0821ec55 124
19e3a9c9 125 memset(&br_dst, 0, sizeof(br_dst));
4e3fd7a0 126 br_dst.u.ip6 = *dst;
08b202b6 127 br_dst.proto = htons(ETH_P_IPV6);
b0e9a30d 128 br_dst.vid = vid;
08b202b6 129
19e3a9c9 130 return br_mdb_ip_get(br, &br_dst);
08b202b6
YH		 131}
132#endif
133
eb1d1641 134struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
fbca58a2 135 struct sk_buff *skb, u16 vid)
eb1d1641 136{
8ef2a9a5
YH		 137 struct br_ip ip;
138
13cefad2 139 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
eb1d1641
HX		 140 return NULL;
141
8ef2a9a5 142 if (BR_INPUT_SKB_CB(skb)->igmp)
eb1d1641
HX		 143 return NULL;
144
19e3a9c9 145 memset(&ip, 0, sizeof(ip));
8ef2a9a5 146 ip.proto = skb->protocol;
fbca58a2 147 ip.vid = vid;
8ef2a9a5 148
eb1d1641
HX		 149 switch (skb->protocol) {
150 case htons(ETH_P_IP):
8ef2a9a5
YH		 151 ip.u.ip4 = ip_hdr(skb)->daddr;
152 break;
dfd56b8b 153#if IS_ENABLED(CONFIG_IPV6)
08b202b6 154 case htons(ETH_P_IPV6):
4e3fd7a0 155 ip.u.ip6 = ipv6_hdr(skb)->daddr;
08b202b6
YH		 156 break;
157#endif
8ef2a9a5
YH		 158 default:
159 return NULL;
eb1d1641
HX		 160 }
161
19e3a9c9 162 return br_mdb_ip_get_rcu(br, &ip);
eb1d1641
HX		 163}
164
88c1f37f 165static void br_multicast_group_expired(struct timer_list *t)
eb1d1641 166{
88c1f37f 167 struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer);
eb1d1641 168 struct net_bridge *br = mp->br;
eb1d1641
HX		 169
170 spin_lock(&br->multicast_lock);
171 if (!netif_running(br->dev) || timer_pending(&mp->timer))
172 goto out;
173
ff0fd34e 174 mp->host_joined = false;
2a26028d 175 br_mdb_notify(br->dev, NULL, &mp->addr, RTM_DELMDB, 0);
eb1d1641
HX		 176
177 if (mp->ports)
178 goto out;
179
19e3a9c9
NA		 180 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
181 br_mdb_rht_params);
182 hlist_del_rcu(&mp->mdb_node);
eb1d1641 183
4329596c 184 kfree_rcu(mp, rcu);
eb1d1641
HX		 185
186out:
187 spin_unlock(&br->multicast_lock);
188}
189
190static void br_multicast_del_pg(struct net_bridge *br,
191 struct net_bridge_port_group *pg)
192{
eb1d1641
HX		 193 struct net_bridge_mdb_entry *mp;
194 struct net_bridge_port_group *p;
e8051688
ED		 195 struct net_bridge_port_group __rcu **pp;
196
19e3a9c9 197 mp = br_mdb_ip_get(br, &pg->addr);
eb1d1641
HX		 198 if (WARN_ON(!mp))
199 return;
200
e8051688
ED		 201 for (pp = &mp->ports;
202 (p = mlock_dereference(*pp, br)) != NULL;
203 pp = &p->next) {
eb1d1641
HX		 204 if (p != pg)
205 continue;
206
83f6a740 207 rcu_assign_pointer(*pp, p->next);
eb1d1641
HX		 208 hlist_del_init(&p->mglist);
209 del_timer(&p->timer);
45ebcce5
ER		 210 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
211 p->flags);
4329596c 212 kfree_rcu(p, rcu);
eb1d1641 213
ff0fd34e 214 if (!mp->ports && !mp->host_joined &&
eb1d1641
HX		 215 netif_running(br->dev))
216 mod_timer(&mp->timer, jiffies);
217
218 return;
219 }
220
221 WARN_ON(1);
222}
223
88c1f37f 224static void br_multicast_port_group_expired(struct timer_list *t)
eb1d1641 225{
88c1f37f 226 struct net_bridge_port_group *pg = from_timer(pg, t, timer);
eb1d1641
HX		 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) ||
9d06b6d8 231 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
eb1d1641
HX		 232 goto out;
233
234 br_multicast_del_pg(br, pg);
235
236out:
237 spin_unlock(&br->multicast_lock);
238}
239
8ef2a9a5 240static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
1080ab95
NA		 241 __be32 group,
242 u8 *igmp_type)
eb1d1641 243{
5e923585
NA		 244 struct igmpv3_query *ihv3;
245 size_t igmp_hdr_size;
eb1d1641
HX		 246 struct sk_buff *skb;
247 struct igmphdr *ih;
248 struct ethhdr *eth;
249 struct iphdr *iph;
250
5e923585
NA		 251 igmp_hdr_size = sizeof(*ih);
252 if (br->multicast_igmp_version == 3)
253 igmp_hdr_size = sizeof(*ihv3);
eb1d1641 254 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
5e923585 255 igmp_hdr_size + 4);
eb1d1641
HX		 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
e5a727f6 264 ether_addr_copy(eth->h_source, br->dev->dev_addr);
eb1d1641
HX		 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;
5e923585 280 iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4);
eb1d1641
HX		 281 iph->id = 0;
282 iph->frag_off = htons(IP_DF);
283 iph->ttl = 1;
284 iph->protocol = IPPROTO_IGMP;
675779ad 285 iph->saddr = br_opt_get(br, BROPT_MULTICAST_QUERY_USE_IFADDR) ?
1c8ad5bf 286 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
eb1d1641
HX		 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);
1080ab95 296 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
eb1d1641 297
5e923585
NA		 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);
eb1d1641
HX		 327 __skb_pull(skb, sizeof(*eth));
328
329out:
330 return skb;
331}
332
dfd56b8b 333#if IS_ENABLED(CONFIG_IPV6)
08b202b6 334static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
1080ab95
NA		 335 const struct in6_addr *grp,
336 u8 *igmp_type)
08b202b6 337{
aa2ae3e7
NA		 338 struct mld2_query *mld2q;
339 unsigned long interval;
08b202b6
YH		 340 struct ipv6hdr *ip6h;
341 struct mld_msg *mldq;
aa2ae3e7
NA		 342 size_t mld_hdr_size;
343 struct sk_buff *skb;
08b202b6
YH		 344 struct ethhdr *eth;
345 u8 *hopopt;
08b202b6 346
aa2ae3e7
NA		 347 mld_hdr_size = sizeof(*mldq);
348 if (br->multicast_mld_version == 2)
349 mld_hdr_size = sizeof(*mld2q);
08b202b6 350 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
aa2ae3e7 351 8 + mld_hdr_size);
08b202b6
YH		 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
e5a727f6 361 ether_addr_copy(eth->h_source, br->dev->dev_addr);
08b202b6
YH		 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);
aa2ae3e7 370 ip6h->payload_len = htons(8 + mld_hdr_size);
08b202b6
YH		 371 ip6h->nexthdr = IPPROTO_HOPOPTS;
372 ip6h->hop_limit = 1;
a7bff75b 373 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
d1d81d4c
UW		 374 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
375 &ip6h->saddr)) {
376 kfree_skb(skb);
675779ad 377 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, false);
d1d81d4c
UW		 378 return NULL;
379 }
0888d5f3 380
675779ad 381 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
36cff5a1 382 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
08b202b6
YH		 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;
1de5a71c
EZ		 391 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
392 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
08b202b6
YH		 393
394 skb_put(skb, sizeof(*ip6h) + 8);
395
396 /* ICMPv6 */
397 skb_set_transport_header(skb, skb->len);
1080ab95 398 interval = ipv6_addr_any(grp) ?
32de868c
LL		 399 br->multicast_query_response_interval :
400 br->multicast_last_member_interval;
1080ab95 401 *igmp_type = ICMPV6_MGM_QUERY;
aa2ae3e7
NA		 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);
53631a5f 419 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
aa2ae3e7
NA		 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);
08b202b6
YH		 439
440 __skb_pull(skb, sizeof(*eth));
441
442out:
443 return skb;
444}
445#endif
446
8ef2a9a5 447static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
1080ab95
NA		 448 struct br_ip *addr,
449 u8 *igmp_type)
8ef2a9a5
YH		 450{
451 switch (addr->proto) {
452 case htons(ETH_P_IP):
1080ab95 453 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
dfd56b8b 454#if IS_ENABLED(CONFIG_IPV6)
08b202b6 455 case htons(ETH_P_IPV6):
1080ab95
NA		 456 return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
457 igmp_type);
08b202b6 458#endif
8ef2a9a5
YH		 459 }
460 return NULL;
461}
462
cfd56754 463struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
5e923585 464 struct br_ip *group)
eb1d1641 465{
eb1d1641 466 struct net_bridge_mdb_entry *mp;
4c0833bc 467 int err;
eb1d1641 468
19e3a9c9
NA		 469 mp = br_mdb_ip_get(br, group);
470 if (mp)
471 return mp;
eb1d1641 472
19e3a9c9
NA		 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);
eb1d1641
HX		 476 }
477
478 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
479 if (unlikely(!mp))
4c0833bc 480 return ERR_PTR(-ENOMEM);
eb1d1641
HX		 481
482 mp->br = br;
8ef2a9a5 483 mp->addr = *group;
88c1f37f 484 timer_setup(&mp->timer, br_multicast_group_expired, 0);
19e3a9c9
NA		 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 }
1faabf2a 493
eb1d1641
HX		 494 return mp;
495}
496
cfd56754
CW		 497struct net_bridge_port_group *br_multicast_new_port_group(
498 struct net_bridge_port *port,
499 struct br_ip *group,
ccb1c31a 500 struct net_bridge_port_group __rcu *next,
6db6f0ea
FF		 501 unsigned char flags,
502 const unsigned char *src)
cfd56754
CW		 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;
9d06b6d8 512 p->flags = flags;
eca2a43b 513 rcu_assign_pointer(p->next, next);
cfd56754 514 hlist_add_head(&p->mglist, &port->mglist);
88c1f37f 515 timer_setup(&p->timer, br_multicast_port_group_expired, 0);
6db6f0ea
FF		 516
517 if (src)
518 memcpy(p->eth_addr, src, ETH_ALEN);
519 else
520 memset(p->eth_addr, 0xff, ETH_ALEN);
521
cfd56754
CW		 522 return p;
523}
524
6db6f0ea
FF		 525static 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
eb1d1641 538static int br_multicast_add_group(struct net_bridge *br,
8ef2a9a5 539 struct net_bridge_port *port,
6db6f0ea
FF		 540 struct br_ip *group,
541 const unsigned char *src)
eb1d1641 542{
e8051688 543 struct net_bridge_port_group __rcu **pp;
5e923585
NA		 544 struct net_bridge_port_group *p;
545 struct net_bridge_mdb_entry *mp;
454594f3 546 unsigned long now = jiffies;
eb1d1641
HX		 547 int err;
548
eb1d1641
HX		 549 spin_lock(&br->multicast_lock);
550 if (!netif_running(br->dev) ||
551 (port && port->state == BR_STATE_DISABLED))
552 goto out;
553
19e3a9c9 554 mp = br_multicast_new_group(br, group);
eb1d1641 555 err = PTR_ERR(mp);
4c0833bc 556 if (IS_ERR(mp))
eb1d1641
HX		 557 goto err;
558
559 if (!port) {
2a26028d
AL		 560 if (!mp->host_joined) {
561 mp->host_joined = true;
562 br_mdb_notify(br->dev, NULL, &mp->addr, RTM_NEWMDB, 0);
563 }
454594f3 564 mod_timer(&mp->timer, now + br->multicast_membership_interval);
eb1d1641
HX		 565 goto out;
566 }
567
e8051688
ED		 568 for (pp = &mp->ports;
569 (p = mlock_dereference(*pp, br)) != NULL;
570 pp = &p->next) {
6db6f0ea 571 if (br_port_group_equal(p, port, src))
454594f3 572 goto found;
eb1d1641
HX		 573 if ((unsigned long)p->port < (unsigned long)port)
574 break;
575 }
576
6db6f0ea 577 p = br_multicast_new_port_group(port, group, *pp, 0, src);
eb1d1641
HX		 578 if (unlikely(!p))
579 goto err;
eb1d1641 580 rcu_assign_pointer(*pp, p);
45ebcce5 581 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
eb1d1641 582
454594f3
LL		 583found:
584 mod_timer(&p->timer, now + br->multicast_membership_interval);
eb1d1641
HX		 585out:
586 err = 0;
587
588err:
589 spin_unlock(&br->multicast_lock);
590 return err;
591}
592
8ef2a9a5
YH		 593static int br_ip4_multicast_add_group(struct net_bridge *br,
594 struct net_bridge_port *port,
b0e9a30d 595 __be32 group,
6db6f0ea
FF		 596 __u16 vid,
597 const unsigned char *src)
8ef2a9a5
YH		 598{
599 struct br_ip br_group;
600
601 if (ipv4_is_local_multicast(group))
602 return 0;
603
604 br_group.u.ip4 = group;
605 br_group.proto = htons(ETH_P_IP);
b0e9a30d 606 br_group.vid = vid;
8ef2a9a5 607
6db6f0ea 608 return br_multicast_add_group(br, port, &br_group, src);
8ef2a9a5
YH		 609}
610
dfd56b8b 611#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 612static int br_ip6_multicast_add_group(struct net_bridge *br,
613 struct net_bridge_port *port,
b0e9a30d 614 const struct in6_addr *group,
6db6f0ea
FF		 615 __u16 vid,
616 const unsigned char *src)
08b202b6
YH		 617{
618 struct br_ip br_group;
619
3c3769e6 620 if (ipv6_addr_is_ll_all_nodes(group))
08b202b6
YH		 621 return 0;
622
19e3a9c9 623 memset(&br_group, 0, sizeof(br_group));
4e3fd7a0 624 br_group.u.ip6 = *group;
9cc6e0c4 625 br_group.proto = htons(ETH_P_IPV6);
b0e9a30d 626 br_group.vid = vid;
08b202b6 627
6db6f0ea 628 return br_multicast_add_group(br, port, &br_group, src);
08b202b6
YH		 629}
630#endif
631
88c1f37f 632static void br_multicast_router_expired(struct timer_list *t)
eb1d1641 633{
88c1f37f
AP		 634 struct net_bridge_port *port =
635 from_timer(port, t, multicast_router_timer);
eb1d1641
HX		 636 struct net_bridge *br = port->br;
637
638 spin_lock(&br->multicast_lock);
a55d8246
NA		 639 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
640 port->multicast_router == MDB_RTR_TYPE_PERM ||
f12e7d95 641 timer_pending(&port->multicast_router_timer))
eb1d1641
HX		 642 goto out;
643
f12e7d95 644 __del_port_router(port);
eb1d1641
HX		 645out:
646 spin_unlock(&br->multicast_lock);
647}
648
77041420
YG		 649static void br_mc_router_state_change(struct net_bridge *p,
650 bool is_mc_router)
651{
652 struct switchdev_attr attr = {
653 .orig_dev = p->dev,
654 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
655 .flags = SWITCHDEV_F_DEFER,
656 .u.mrouter = is_mc_router,
657 };
658
659 switchdev_port_attr_set(p->dev, &attr);
660}
661
88c1f37f 662static void br_multicast_local_router_expired(struct timer_list *t)
eb1d1641 663{
88c1f37f 664 struct net_bridge *br = from_timer(br, t, multicast_router_timer);
77041420
YG		 665
666 spin_lock(&br->multicast_lock);
667 if (br->multicast_router == MDB_RTR_TYPE_DISABLED ||
668 br->multicast_router == MDB_RTR_TYPE_PERM ||
669 timer_pending(&br->multicast_router_timer))
670 goto out;
671
672 br_mc_router_state_change(br, false);
673out:
674 spin_unlock(&br->multicast_lock);
eb1d1641
HX		 675}
676
cc0fdd80 677static void br_multicast_querier_expired(struct net_bridge *br,
90010b36 678 struct bridge_mcast_own_query *query)
c83b8fab 679{
c83b8fab 680 spin_lock(&br->multicast_lock);
13cefad2 681 if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
c83b8fab
HX		 682 goto out;
683
cc0fdd80 684 br_multicast_start_querier(br, query);
c83b8fab
HX		 685
686out:
687 spin_unlock(&br->multicast_lock);
688}
689
88c1f37f 690static void br_ip4_multicast_querier_expired(struct timer_list *t)
cc0fdd80 691{
88c1f37f 692 struct net_bridge *br = from_timer(br, t, ip4_other_query.timer);
cc0fdd80 693
90010b36 694 br_multicast_querier_expired(br, &br->ip4_own_query);
cc0fdd80
LL		 695}
696
697#if IS_ENABLED(CONFIG_IPV6)
88c1f37f 698static void br_ip6_multicast_querier_expired(struct timer_list *t)
cc0fdd80 699{
88c1f37f 700 struct net_bridge *br = from_timer(br, t, ip6_other_query.timer);
cc0fdd80 701
90010b36 702 br_multicast_querier_expired(br, &br->ip6_own_query);
cc0fdd80
LL		 703}
704#endif
705
dc4eb53a
LL		 706static void br_multicast_select_own_querier(struct net_bridge *br,
707 struct br_ip *ip,
708 struct sk_buff *skb)
709{
710 if (ip->proto == htons(ETH_P_IP))
711 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
712#if IS_ENABLED(CONFIG_IPV6)
713 else
714 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
715#endif
716}
717
8ef2a9a5
YH		 718static void __br_multicast_send_query(struct net_bridge *br,
719 struct net_bridge_port *port,
720 struct br_ip *ip)
eb1d1641 721{
eb1d1641 722 struct sk_buff *skb;
1080ab95 723 u8 igmp_type;
eb1d1641 724
1080ab95 725 skb = br_multicast_alloc_query(br, ip, &igmp_type);
eb1d1641 726 if (!skb)
8ef2a9a5 727 return;
eb1d1641
HX		 728
729 if (port) {
eb1d1641 730 skb->dev = port->dev;
a65056ec 731 br_multicast_count(br, port, skb, igmp_type,
1080ab95 732 BR_MCAST_DIR_TX);
29a26a56
EB		 733 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
734 dev_net(port->dev), NULL, skb, NULL, skb->dev,
f0b4eece 735 br_dev_queue_push_xmit);
dc4eb53a
LL		 736 } else {
737 br_multicast_select_own_querier(br, ip, skb);
a65056ec 738 br_multicast_count(br, port, skb, igmp_type,
1080ab95 739 BR_MCAST_DIR_RX);
eb1d1641 740 netif_rx(skb);
dc4eb53a 741 }
8ef2a9a5
YH		 742}
743
744static void br_multicast_send_query(struct net_bridge *br,
cc0fdd80 745 struct net_bridge_port *port,
90010b36 746 struct bridge_mcast_own_query *own_query)
8ef2a9a5 747{
90010b36 748 struct bridge_mcast_other_query *other_query = NULL;
5e923585
NA		 749 struct br_ip br_group;
750 unsigned long time;
8ef2a9a5 751
13cefad2
NA		 752 if (!netif_running(br->dev) ||
753 !br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
675779ad 754 !br_opt_get(br, BROPT_MULTICAST_QUERIER))
8ef2a9a5
YH		 755 return;
756
08b202b6
YH		 757 memset(&br_group.u, 0, sizeof(br_group.u));
758
90010b36
LL		 759 if (port ? (own_query == &port->ip4_own_query) :
760 (own_query == &br->ip4_own_query)) {
761 other_query = &br->ip4_other_query;
cc0fdd80 762 br_group.proto = htons(ETH_P_IP);
dfd56b8b 763#if IS_ENABLED(CONFIG_IPV6)
cc0fdd80 764 } else {
90010b36 765 other_query = &br->ip6_other_query;
cc0fdd80 766 br_group.proto = htons(ETH_P_IPV6);
08b202b6 767#endif
cc0fdd80
LL		 768 }
769
90010b36 770 if (!other_query || timer_pending(&other_query->timer))
cc0fdd80
LL		 771 return;
772
773 __br_multicast_send_query(br, port, &br_group);
eb1d1641 774
eb1d1641 775 time = jiffies;
90010b36 776 time += own_query->startup_sent < br->multicast_startup_query_count ?
eb1d1641
HX		 777 br->multicast_startup_query_interval :
778 br->multicast_query_interval;
90010b36 779 mod_timer(&own_query->timer, time);
eb1d1641
HX		 780}
781
90010b36
LL		 782static void
783br_multicast_port_query_expired(struct net_bridge_port *port,
784 struct bridge_mcast_own_query *query)
eb1d1641 785{
eb1d1641
HX		 786 struct net_bridge *br = port->br;
787
788 spin_lock(&br->multicast_lock);
02a780c0
DC		 789 if (port->state == BR_STATE_DISABLED ||
790 port->state == BR_STATE_BLOCKING)
eb1d1641
HX		 791 goto out;
792
cc0fdd80
LL		 793 if (query->startup_sent < br->multicast_startup_query_count)
794 query->startup_sent++;
eb1d1641 795
cc0fdd80 796 br_multicast_send_query(port->br, port, query);
eb1d1641
HX		 797
798out:
799 spin_unlock(&br->multicast_lock);
800}
801
88c1f37f 802static void br_ip4_multicast_port_query_expired(struct timer_list *t)
cc0fdd80 803{
88c1f37f 804 struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer);
cc0fdd80 805
90010b36 806 br_multicast_port_query_expired(port, &port->ip4_own_query);
cc0fdd80
LL		 807}
808
809#if IS_ENABLED(CONFIG_IPV6)
88c1f37f 810static void br_ip6_multicast_port_query_expired(struct timer_list *t)
cc0fdd80 811{
88c1f37f 812 struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer);
cc0fdd80 813
90010b36 814 br_multicast_port_query_expired(port, &port->ip6_own_query);
cc0fdd80
LL		 815}
816#endif
817
147c1e9b
NF		 818static void br_mc_disabled_update(struct net_device *dev, bool value)
819{
820 struct switchdev_attr attr = {
821 .orig_dev = dev,
822 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
823 .flags = SWITCHDEV_F_DEFER,
13cefad2 824 .u.mc_disabled = !value,
147c1e9b
NF		 825 };
826
827 switchdev_port_attr_set(dev, &attr);
828}
829
1080ab95 830int br_multicast_add_port(struct net_bridge_port *port)
eb1d1641 831{
7f0aec7a 832 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
eb1d1641 833
88c1f37f
AP		 834 timer_setup(&port->multicast_router_timer,
835 br_multicast_router_expired, 0);
836 timer_setup(&port->ip4_own_query.timer,
837 br_ip4_multicast_port_query_expired, 0);
cc0fdd80 838#if IS_ENABLED(CONFIG_IPV6)
88c1f37f
AP		 839 timer_setup(&port->ip6_own_query.timer,
840 br_ip6_multicast_port_query_expired, 0);
cc0fdd80 841#endif
13cefad2
NA		 842 br_mc_disabled_update(port->dev,
843 br_opt_get(port->br, BROPT_MULTICAST_ENABLED));
147c1e9b 844
1080ab95
NA		 845 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
846 if (!port->mcast_stats)
847 return -ENOMEM;
848
849 return 0;
eb1d1641
HX		 850}
851
852void br_multicast_del_port(struct net_bridge_port *port)
853{
e10177ab
SA		 854 struct net_bridge *br = port->br;
855 struct net_bridge_port_group *pg;
856 struct hlist_node *n;
857
858 /* Take care of the remaining groups, only perm ones should be left */
859 spin_lock_bh(&br->multicast_lock);
860 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
861 br_multicast_del_pg(br, pg);
862 spin_unlock_bh(&br->multicast_lock);
eb1d1641 863 del_timer_sync(&port->multicast_router_timer);
1080ab95 864 free_percpu(port->mcast_stats);
eb1d1641
HX		 865}
866
90010b36 867static void br_multicast_enable(struct bridge_mcast_own_query *query)
561f1103 868{
cc0fdd80 869 query->startup_sent = 0;
561f1103 870
cc0fdd80
LL		 871 if (try_to_del_timer_sync(&query->timer) >= 0 ||
872 del_timer(&query->timer))
873 mod_timer(&query->timer, jiffies);
561f1103
HX		 874}
875
7cb3f921 876static void __br_multicast_enable_port(struct net_bridge_port *port)
eb1d1641
HX		 877{
878 struct net_bridge *br = port->br;
879
13cefad2 880 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || !netif_running(br->dev))
7cb3f921 881 return;
eb1d1641 882
90010b36 883 br_multicast_enable(&port->ip4_own_query);
cc0fdd80 884#if IS_ENABLED(CONFIG_IPV6)
90010b36 885 br_multicast_enable(&port->ip6_own_query);
cc0fdd80 886#endif
7f0aec7a
NA		 887 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
888 hlist_unhashed(&port->rlist))
754bc547 889 br_multicast_add_router(br, port);
7cb3f921 890}
eb1d1641 891
7cb3f921
NA		 892void br_multicast_enable_port(struct net_bridge_port *port)
893{
894 struct net_bridge *br = port->br;
895
896 spin_lock(&br->multicast_lock);
897 __br_multicast_enable_port(port);
eb1d1641
HX		 898 spin_unlock(&br->multicast_lock);
899}
900
901void br_multicast_disable_port(struct net_bridge_port *port)
902{
903 struct net_bridge *br = port->br;
904 struct net_bridge_port_group *pg;
b67bfe0d 905 struct hlist_node *n;
eb1d1641
HX		 906
907 spin_lock(&br->multicast_lock);
b67bfe0d 908 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
9d06b6d8 909 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
e10177ab 910 br_multicast_del_pg(br, pg);
eb1d1641 911
f12e7d95
NF		 912 __del_port_router(port);
913
eb1d1641 914 del_timer(&port->multicast_router_timer);
90010b36 915 del_timer(&port->ip4_own_query.timer);
cc0fdd80 916#if IS_ENABLED(CONFIG_IPV6)
90010b36 917 del_timer(&port->ip6_own_query.timer);
cc0fdd80 918#endif
eb1d1641
HX		 919 spin_unlock(&br->multicast_lock);
920}
921
8ef2a9a5
YH		 922static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
923 struct net_bridge_port *port,
06499098
VY		 924 struct sk_buff *skb,
925 u16 vid)
eb1d1641 926{
6db6f0ea 927 const unsigned char *src;
eb1d1641
HX		 928 struct igmpv3_report *ih;
929 struct igmpv3_grec *grec;
930 int i;
931 int len;
932 int num;
933 int type;
934 int err = 0;
935 __be32 group;
936
eb1d1641
HX		 937 ih = igmpv3_report_hdr(skb);
938 num = ntohs(ih->ngrec);
c2d4fbd2 939 len = skb_transport_offset(skb) + sizeof(*ih);
eb1d1641
HX		 940
941 for (i = 0; i < num; i++) {
942 len += sizeof(*grec);
ba5ea614 943 if (!ip_mc_may_pull(skb, len))
eb1d1641
HX		 944 return -EINVAL;
945
fd218cf9 946 grec = (void *)(skb->data + len - sizeof(*grec));
eb1d1641
HX		 947 group = grec->grec_mca;
948 type = grec->grec_type;
949
8eabf95c 950 len += ntohs(grec->grec_nsrcs) * 4;
ba5ea614 951 if (!ip_mc_may_pull(skb, len))
eb1d1641
HX		 952 return -EINVAL;
953
954 /* We treat this as an IGMPv2 report for now. */
955 switch (type) {
956 case IGMPV3_MODE_IS_INCLUDE:
957 case IGMPV3_MODE_IS_EXCLUDE:
958 case IGMPV3_CHANGE_TO_INCLUDE:
959 case IGMPV3_CHANGE_TO_EXCLUDE:
960 case IGMPV3_ALLOW_NEW_SOURCES:
961 case IGMPV3_BLOCK_OLD_SOURCES:
962 break;
963
964 default:
965 continue;
966 }
967
6db6f0ea 968 src = eth_hdr(skb)->h_source;
bc8c20ac
SA		 969 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
970 type == IGMPV3_MODE_IS_INCLUDE) &&
971 ntohs(grec->grec_nsrcs) == 0) {
6db6f0ea 972 br_ip4_multicast_leave_group(br, port, group, vid, src);
bc8c20ac 973 } else {
6db6f0ea
FF		 974 err = br_ip4_multicast_add_group(br, port, group, vid,
975 src);
bc8c20ac
SA		 976 if (err)
977 break;
978 }
eb1d1641
HX		 979 }
980
981 return err;
982}
983
dfd56b8b 984#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 985static int br_ip6_multicast_mld2_report(struct net_bridge *br,
986 struct net_bridge_port *port,
06499098
VY		 987 struct sk_buff *skb,
988 u16 vid)
08b202b6 989{
ba5ea614 990 unsigned int nsrcs_offset;
6db6f0ea 991 const unsigned char *src;
08b202b6
YH		 992 struct icmp6hdr *icmp6h;
993 struct mld2_grec *grec;
ba5ea614 994 unsigned int grec_len;
08b202b6
YH		 995 int i;
996 int len;
997 int num;
998 int err = 0;
999
ba5ea614 1000 if (!ipv6_mc_may_pull(skb, sizeof(*icmp6h)))
08b202b6
YH		 1001 return -EINVAL;
1002
1003 icmp6h = icmp6_hdr(skb);
1004 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
c2d4fbd2 1005 len = skb_transport_offset(skb) + sizeof(*icmp6h);
08b202b6
YH		 1006
1007 for (i = 0; i < num; i++) {
1008 __be16 *nsrcs, _nsrcs;
1009
ba5ea614
LL		 1010 nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs);
1011
1012 if (skb_transport_offset(skb) + ipv6_transport_len(skb) <
1013 nsrcs_offset + sizeof(_nsrcs))
1014 return -EINVAL;
1015
1016 nsrcs = skb_header_pointer(skb, nsrcs_offset,
08b202b6
YH		 1017 sizeof(_nsrcs), &_nsrcs);
1018 if (!nsrcs)
1019 return -EINVAL;
1020
4154b567 1021 grec_len = struct_size(grec, grec_src, ntohs(*nsrcs));
ba5ea614
LL		 1022
1023 if (!ipv6_mc_may_pull(skb, len + grec_len))
08b202b6
YH		 1024 return -EINVAL;
1025
1026 grec = (struct mld2_grec *)(skb->data + len);
ba5ea614 1027 len += grec_len;
08b202b6
YH		 1028
1029 /* We treat these as MLDv1 reports for now. */
1030 switch (grec->grec_type) {
1031 case MLD2_MODE_IS_INCLUDE:
1032 case MLD2_MODE_IS_EXCLUDE:
1033 case MLD2_CHANGE_TO_INCLUDE:
1034 case MLD2_CHANGE_TO_EXCLUDE:
1035 case MLD2_ALLOW_NEW_SOURCES:
1036 case MLD2_BLOCK_OLD_SOURCES:
1037 break;
1038
1039 default:
1040 continue;
1041 }
1042
6db6f0ea 1043 src = eth_hdr(skb)->h_source;
bc8c20ac
SA		 1044 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1045 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1046 ntohs(*nsrcs) == 0) {
1047 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
6db6f0ea 1048 vid, src);
bc8c20ac
SA		 1049 } else {
1050 err = br_ip6_multicast_add_group(br, port,
6db6f0ea
FF		 1051 &grec->grec_mca, vid,
1052 src);
9264251e 1053 if (err)
bc8c20ac
SA		 1054 break;
1055 }
08b202b6
YH		 1056 }
1057
1058 return err;
1059}
1060#endif
1061
dc4eb53a 1062static bool br_ip4_multicast_select_querier(struct net_bridge *br,
2cd41431 1063 struct net_bridge_port *port,
dc4eb53a
LL		 1064 __be32 saddr)
1065{
1066 if (!timer_pending(&br->ip4_own_query.timer) &&
1067 !timer_pending(&br->ip4_other_query.timer))
1068 goto update;
1069
1070 if (!br->ip4_querier.addr.u.ip4)
1071 goto update;
1072
1073 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1074 goto update;
1075
1076 return false;
1077
1078update:
1079 br->ip4_querier.addr.u.ip4 = saddr;
1080
2cd41431
LL		 1081 /* update protected by general multicast_lock by caller */
1082 rcu_assign_pointer(br->ip4_querier.port, port);
1083
dc4eb53a
LL		 1084 return true;
1085}
1086
1087#if IS_ENABLED(CONFIG_IPV6)
1088static bool br_ip6_multicast_select_querier(struct net_bridge *br,
2cd41431 1089 struct net_bridge_port *port,
dc4eb53a
LL		 1090 struct in6_addr *saddr)
1091{
1092 if (!timer_pending(&br->ip6_own_query.timer) &&
1093 !timer_pending(&br->ip6_other_query.timer))
1094 goto update;
1095
1096 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1097 goto update;
1098
1099 return false;
1100
1101update:
1102 br->ip6_querier.addr.u.ip6 = *saddr;
1103
2cd41431
LL		 1104 /* update protected by general multicast_lock by caller */
1105 rcu_assign_pointer(br->ip6_querier.port, port);
1106
dc4eb53a
LL		 1107 return true;
1108}
1109#endif
1110
1111static bool br_multicast_select_querier(struct net_bridge *br,
2cd41431 1112 struct net_bridge_port *port,
dc4eb53a
LL		 1113 struct br_ip *saddr)
1114{
1115 switch (saddr->proto) {
1116 case htons(ETH_P_IP):
2cd41431 1117 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
dc4eb53a
LL		 1118#if IS_ENABLED(CONFIG_IPV6)
1119 case htons(ETH_P_IPV6):
2cd41431 1120 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
dc4eb53a
LL		 1121#endif
1122 }
1123
1124 return false;
1125}
1126
cc0fdd80 1127static void
90010b36
LL		 1128br_multicast_update_query_timer(struct net_bridge *br,
1129 struct bridge_mcast_other_query *query,
1130 unsigned long max_delay)
b00589af 1131{
90010b36
LL		 1132 if (!timer_pending(&query->timer))
1133 query->delay_time = jiffies + max_delay;
b00589af 1134
90010b36 1135 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
b00589af
LL		 1136}
1137
6d549648
NF		 1138static void br_port_mc_router_state_change(struct net_bridge_port *p,
1139 bool is_mc_router)
1140{
1141 struct switchdev_attr attr = {
1142 .orig_dev = p->dev,
1143 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
1144 .flags = SWITCHDEV_F_DEFER,
1145 .u.mrouter = is_mc_router,
1146 };
1147
1148 switchdev_port_attr_set(p->dev, &attr);
1149}
1150
7e80c124 1151/*
7c77602f 1152 * Add port to router_list
7e80c124 1153 * list is maintained ordered by pointer value
1154 * and locked by br->multicast_lock and RCU
1155 */
0909e117
HX		 1156static void br_multicast_add_router(struct net_bridge *br,
1157 struct net_bridge_port *port)
1158{
dcdca2c4 1159 struct net_bridge_port *p;
b67bfe0d 1160 struct hlist_node *slot = NULL;
dcdca2c4 1161
1a040eac
NA		 1162 if (!hlist_unhashed(&port->rlist))
1163 return;
1164
b67bfe0d 1165 hlist_for_each_entry(p, &br->router_list, rlist) {
7e80c124 1166 if ((unsigned long) port >= (unsigned long) p)
1167 break;
b67bfe0d 1168 slot = &p->rlist;
dcdca2c4 1169 }
1170
7e80c124 1171 if (slot)
1d023284 1172 hlist_add_behind_rcu(&port->rlist, slot);
dcdca2c4 1173 else
1174 hlist_add_head_rcu(&port->rlist, &br->router_list);
949f1e39 1175 br_rtr_notify(br->dev, port, RTM_NEWMDB);
6d549648 1176 br_port_mc_router_state_change(port, true);
0909e117
HX		 1177}
1178
eb1d1641
HX		 1179static void br_multicast_mark_router(struct net_bridge *br,
1180 struct net_bridge_port *port)
1181{
1182 unsigned long now = jiffies;
eb1d1641
HX		 1183
1184 if (!port) {
77041420
YG		 1185 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
1186 if (!timer_pending(&br->multicast_router_timer))
1187 br_mc_router_state_change(br, true);
eb1d1641
HX		 1188 mod_timer(&br->multicast_router_timer,
1189 now + br->multicast_querier_interval);
77041420 1190 }
eb1d1641
HX		 1191 return;
1192 }
1193
a55d8246
NA		 1194 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1195 port->multicast_router == MDB_RTR_TYPE_PERM)
eb1d1641
HX		 1196 return;
1197
0909e117 1198 br_multicast_add_router(br, port);
eb1d1641 1199
eb1d1641
HX		 1200 mod_timer(&port->multicast_router_timer,
1201 now + br->multicast_querier_interval);
1202}
1203
1204static void br_multicast_query_received(struct net_bridge *br,
1205 struct net_bridge_port *port,
90010b36 1206 struct bridge_mcast_other_query *query,
dc4eb53a 1207 struct br_ip *saddr,
b00589af 1208 unsigned long max_delay)
eb1d1641 1209{
2cd41431 1210 if (!br_multicast_select_querier(br, port, saddr))
eb1d1641
HX		 1211 return;
1212
dc4eb53a 1213 br_multicast_update_query_timer(br, query, max_delay);
5a2de63f
HL		 1214
1215 /* Based on RFC4541, section 2.1.1 IGMP Forwarding Rules,
1216 * the arrival port for IGMP Queries where the source address
1217 * is 0.0.0.0 should not be added to router port list.
1218 */
1219 if ((saddr->proto == htons(ETH_P_IP) && saddr->u.ip4) ||
0fe5119e 1220 saddr->proto == htons(ETH_P_IPV6))
5a2de63f 1221 br_multicast_mark_router(br, port);
eb1d1641
HX		 1222}
1223
9c2e955c 1224static void br_ip4_multicast_query(struct net_bridge *br,
1225 struct net_bridge_port *port,
1226 struct sk_buff *skb,
1227 u16 vid)
eb1d1641 1228{
ba5ea614 1229 unsigned int transport_len = ip_transport_len(skb);
b71d1d42 1230 const struct iphdr *iph = ip_hdr(skb);
eb1d1641
HX		 1231 struct igmphdr *ih = igmp_hdr(skb);
1232 struct net_bridge_mdb_entry *mp;
1233 struct igmpv3_query *ih3;
1234 struct net_bridge_port_group *p;
e8051688 1235 struct net_bridge_port_group __rcu **pp;
dc4eb53a 1236 struct br_ip saddr;
eb1d1641
HX		 1237 unsigned long max_delay;
1238 unsigned long now = jiffies;
1239 __be32 group;
1240
1241 spin_lock(&br->multicast_lock);
1242 if (!netif_running(br->dev) ||
1243 (port && port->state == BR_STATE_DISABLED))
1244 goto out;
1245
eb1d1641
HX		 1246 group = ih->group;
1247
ba5ea614 1248 if (transport_len == sizeof(*ih)) {
eb1d1641
HX		 1249 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1250
1251 if (!max_delay) {
1252 max_delay = 10 * HZ;
1253 group = 0;
1254 }
ba5ea614 1255 } else if (transport_len >= sizeof(*ih3)) {
eb1d1641
HX		 1256 ih3 = igmpv3_query_hdr(skb);
1257 if (ih3->nsrcs)
bec68ff1 1258 goto out;
eb1d1641 1259
0ba8c9ec
YH		 1260 max_delay = ih3->code ?
1261 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
9afd85c9 1262 } else {
9ed973cc
LL		 1263 goto out;
1264 }
1265
dc4eb53a
LL		 1266 if (!group) {
1267 saddr.proto = htons(ETH_P_IP);
1268 saddr.u.ip4 = iph->saddr;
b00589af 1269
dc4eb53a
LL		 1270 br_multicast_query_received(br, port, &br->ip4_other_query,
1271 &saddr, max_delay);
eb1d1641 1272 goto out;
dc4eb53a 1273 }
eb1d1641 1274
19e3a9c9 1275 mp = br_mdb_ip4_get(br, group, vid);
eb1d1641
HX		 1276 if (!mp)
1277 goto out;
1278
1279 max_delay *= br->multicast_last_member_count;
1280
ff0fd34e 1281 if (mp->host_joined &&
eb1d1641
HX		 1282 (timer_pending(&mp->timer) ?
1283 time_after(mp->timer.expires, now + max_delay) :
1284 try_to_del_timer_sync(&mp->timer) >= 0))
1285 mod_timer(&mp->timer, now + max_delay);
1286
e8051688
ED		 1287 for (pp = &mp->ports;
1288 (p = mlock_dereference(*pp, br)) != NULL;
1289 pp = &p->next) {
eb1d1641
HX		 1290 if (timer_pending(&p->timer) ?
1291 time_after(p->timer.expires, now + max_delay) :
1292 try_to_del_timer_sync(&p->timer) >= 0)
24f9cdcb 1293 mod_timer(&p->timer, now + max_delay);
eb1d1641
HX		 1294 }
1295
1296out:
1297 spin_unlock(&br->multicast_lock);
eb1d1641
HX		 1298}
1299
dfd56b8b 1300#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1301static int br_ip6_multicast_query(struct net_bridge *br,
1302 struct net_bridge_port *port,
06499098
VY		 1303 struct sk_buff *skb,
1304 u16 vid)
08b202b6 1305{
ba5ea614 1306 unsigned int transport_len = ipv6_transport_len(skb);
b71d1d42 1307 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
eca2a43b 1308 struct mld_msg *mld;
08b202b6
YH		 1309 struct net_bridge_mdb_entry *mp;
1310 struct mld2_query *mld2q;
e8051688
ED		 1311 struct net_bridge_port_group *p;
1312 struct net_bridge_port_group __rcu **pp;
dc4eb53a 1313 struct br_ip saddr;
08b202b6
YH		 1314 unsigned long max_delay;
1315 unsigned long now = jiffies;
856ce5d0 1316 unsigned int offset = skb_transport_offset(skb);
b71d1d42 1317 const struct in6_addr *group = NULL;
9ed973cc 1318 bool is_general_query;
08b202b6
YH		 1319 int err = 0;
1320
1321 spin_lock(&br->multicast_lock);
1322 if (!netif_running(br->dev) ||
1323 (port && port->state == BR_STATE_DISABLED))
1324 goto out;
1325
ba5ea614 1326 if (transport_len == sizeof(*mld)) {
856ce5d0 1327 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
08b202b6
YH		 1328 err = -EINVAL;
1329 goto out;
1330 }
1331 mld = (struct mld_msg *) icmp6_hdr(skb);
4715213d 1332 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
08b202b6
YH		 1333 if (max_delay)
1334 group = &mld->mld_mca;
248ba8ec 1335 } else {
856ce5d0 1336 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
08b202b6
YH		 1337 err = -EINVAL;
1338 goto out;
1339 }
1340 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1341 if (!mld2q->mld2q_nsrcs)
1342 group = &mld2q->mld2q_mca;
e3f5b170
DB		 1343
1344 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
08b202b6
YH		 1345 }
1346
9ed973cc
LL		 1347 is_general_query = group && ipv6_addr_any(group);
1348
dc4eb53a
LL		 1349 if (is_general_query) {
1350 saddr.proto = htons(ETH_P_IPV6);
1351 saddr.u.ip6 = ip6h->saddr;
b00589af 1352
dc4eb53a
LL		 1353 br_multicast_query_received(br, port, &br->ip6_other_query,
1354 &saddr, max_delay);
08b202b6 1355 goto out;
6c03ee8b
LL		 1356 } else if (!group) {
1357 goto out;
dc4eb53a 1358 }
08b202b6 1359
19e3a9c9 1360 mp = br_mdb_ip6_get(br, group, vid);
08b202b6
YH		 1361 if (!mp)
1362 goto out;
1363
1364 max_delay *= br->multicast_last_member_count;
ff0fd34e 1365 if (mp->host_joined &&
08b202b6
YH		 1366 (timer_pending(&mp->timer) ?
1367 time_after(mp->timer.expires, now + max_delay) :
1368 try_to_del_timer_sync(&mp->timer) >= 0))
1369 mod_timer(&mp->timer, now + max_delay);
1370
e8051688
ED		 1371 for (pp = &mp->ports;
1372 (p = mlock_dereference(*pp, br)) != NULL;
1373 pp = &p->next) {
08b202b6
YH		 1374 if (timer_pending(&p->timer) ?
1375 time_after(p->timer.expires, now + max_delay) :
1376 try_to_del_timer_sync(&p->timer) >= 0)
24f9cdcb 1377 mod_timer(&p->timer, now + max_delay);
08b202b6
YH		 1378 }
1379
1380out:
1381 spin_unlock(&br->multicast_lock);
1382 return err;
1383}
1384#endif
1385
90010b36
LL		 1386static void
1387br_multicast_leave_group(struct net_bridge *br,
1388 struct net_bridge_port *port,
1389 struct br_ip *group,
1390 struct bridge_mcast_other_query *other_query,
6db6f0ea
FF		 1391 struct bridge_mcast_own_query *own_query,
1392 const unsigned char *src)
eb1d1641 1393{
eb1d1641
HX		 1394 struct net_bridge_mdb_entry *mp;
1395 struct net_bridge_port_group *p;
1396 unsigned long now;
1397 unsigned long time;
1398
eb1d1641
HX		 1399 spin_lock(&br->multicast_lock);
1400 if (!netif_running(br->dev) ||
544586f7 1401 (port && port->state == BR_STATE_DISABLED))
eb1d1641
HX		 1402 goto out;
1403
19e3a9c9 1404 mp = br_mdb_ip_get(br, group);
eb1d1641
HX		 1405 if (!mp)
1406 goto out;
1407
544586f7
SA		 1408 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1409 struct net_bridge_port_group __rcu **pp;
1410
1411 for (pp = &mp->ports;
1412 (p = mlock_dereference(*pp, br)) != NULL;
1413 pp = &p->next) {
6db6f0ea 1414 if (!br_port_group_equal(p, port, src))
544586f7
SA		 1415 continue;
1416
1417 rcu_assign_pointer(*pp, p->next);
1418 hlist_del_init(&p->mglist);
1419 del_timer(&p->timer);
4329596c 1420 kfree_rcu(p, rcu);
45ebcce5
ER		 1421 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1422 p->flags);
544586f7 1423
ff0fd34e 1424 if (!mp->ports && !mp->host_joined &&
544586f7
SA		 1425 netif_running(br->dev))
1426 mod_timer(&mp->timer, jiffies);
1427 }
1428 goto out;
1429 }
1430
1431 if (timer_pending(&other_query->timer))
1432 goto out;
1433
675779ad 1434 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
6b7df111
CW		 1435 __br_multicast_send_query(br, port, &mp->addr);
1436
1437 time = jiffies + br->multicast_last_member_count *
1438 br->multicast_last_member_interval;
cc0fdd80 1439
90010b36 1440 mod_timer(&own_query->timer, time);
6b7df111
CW		 1441
1442 for (p = mlock_dereference(mp->ports, br);
1443 p != NULL;
1444 p = mlock_dereference(p->next, br)) {
6db6f0ea 1445 if (!br_port_group_equal(p, port, src))
6b7df111
CW		 1446 continue;
1447
1448 if (!hlist_unhashed(&p->mglist) &&
1449 (timer_pending(&p->timer) ?
1450 time_after(p->timer.expires, time) :
1451 try_to_del_timer_sync(&p->timer) >= 0)) {
1452 mod_timer(&p->timer, time);
1453 }
1454
1455 break;
1456 }
1457 }
1458
eb1d1641
HX		 1459 now = jiffies;
1460 time = now + br->multicast_last_member_count *
1461 br->multicast_last_member_interval;
1462
1463 if (!port) {
ff0fd34e 1464 if (mp->host_joined &&
eb1d1641
HX		 1465 (timer_pending(&mp->timer) ?
1466 time_after(mp->timer.expires, time) :
1467 try_to_del_timer_sync(&mp->timer) >= 0)) {
1468 mod_timer(&mp->timer, time);
eb1d1641 1469 }
454594f3
LL		 1470
1471 goto out;
1472 }
1473
1474 for (p = mlock_dereference(mp->ports, br);
1475 p != NULL;
1476 p = mlock_dereference(p->next, br)) {
1477 if (p->port != port)
1478 continue;
1479
1480 if (!hlist_unhashed(&p->mglist) &&
1481 (timer_pending(&p->timer) ?
1482 time_after(p->timer.expires, time) :
1483 try_to_del_timer_sync(&p->timer) >= 0)) {
1484 mod_timer(&p->timer, time);
1485 }
1486
1487 break;
eb1d1641 1488 }
eb1d1641
HX		 1489out:
1490 spin_unlock(&br->multicast_lock);
1491}
1492
8ef2a9a5
YH		 1493static void br_ip4_multicast_leave_group(struct net_bridge *br,
1494 struct net_bridge_port *port,
b0e9a30d 1495 __be32 group,
6db6f0ea
FF		 1496 __u16 vid,
1497 const unsigned char *src)
8ef2a9a5
YH		 1498{
1499 struct br_ip br_group;
90010b36 1500 struct bridge_mcast_own_query *own_query;
8ef2a9a5
YH		 1501
1502 if (ipv4_is_local_multicast(group))
1503 return;
1504
90010b36
LL		 1505 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1506
8ef2a9a5
YH		 1507 br_group.u.ip4 = group;
1508 br_group.proto = htons(ETH_P_IP);
b0e9a30d 1509 br_group.vid = vid;
8ef2a9a5 1510
90010b36 1511 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
6db6f0ea 1512 own_query, src);
8ef2a9a5
YH		 1513}
1514
dfd56b8b 1515#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1516static void br_ip6_multicast_leave_group(struct net_bridge *br,
1517 struct net_bridge_port *port,
b0e9a30d 1518 const struct in6_addr *group,
6db6f0ea
FF		 1519 __u16 vid,
1520 const unsigned char *src)
08b202b6
YH		 1521{
1522 struct br_ip br_group;
90010b36 1523 struct bridge_mcast_own_query *own_query;
08b202b6 1524
3c3769e6 1525 if (ipv6_addr_is_ll_all_nodes(group))
08b202b6
YH		 1526 return;
1527
90010b36
LL		 1528 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1529
4e3fd7a0 1530 br_group.u.ip6 = *group;
08b202b6 1531 br_group.proto = htons(ETH_P_IPV6);
b0e9a30d 1532 br_group.vid = vid;
08b202b6 1533
90010b36 1534 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
6db6f0ea 1535 own_query, src);
08b202b6
YH		 1536}
1537#endif
8ef2a9a5 1538
1080ab95
NA		 1539static void br_multicast_err_count(const struct net_bridge *br,
1540 const struct net_bridge_port *p,
1541 __be16 proto)
1542{
1543 struct bridge_mcast_stats __percpu *stats;
1544 struct bridge_mcast_stats *pstats;
1545
675779ad 1546 if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
1080ab95
NA		 1547 return;
1548
1549 if (p)
1550 stats = p->mcast_stats;
1551 else
1552 stats = br->mcast_stats;
1553 if (WARN_ON(!stats))
1554 return;
1555
1556 pstats = this_cpu_ptr(stats);
1557
1558 u64_stats_update_begin(&pstats->syncp);
1559 switch (proto) {
1560 case htons(ETH_P_IP):
1561 pstats->mstats.igmp_parse_errors++;
1562 break;
1563#if IS_ENABLED(CONFIG_IPV6)
1564 case htons(ETH_P_IPV6):
1565 pstats->mstats.mld_parse_errors++;
1566 break;
1567#endif
1568 }
1569 u64_stats_update_end(&pstats->syncp);
1570}
1571
91b02d3d
NA		 1572static void br_multicast_pim(struct net_bridge *br,
1573 struct net_bridge_port *port,
1574 const struct sk_buff *skb)
1575{
1576 unsigned int offset = skb_transport_offset(skb);
1577 struct pimhdr *pimhdr, _pimhdr;
1578
1579 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1580 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1581 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1582 return;
1583
1584 br_multicast_mark_router(br, port);
1585}
1586
4b3087c7
LL		 1587static int br_ip4_multicast_mrd_rcv(struct net_bridge *br,
1588 struct net_bridge_port *port,
1589 struct sk_buff *skb)
1590{
1591 if (ip_hdr(skb)->protocol != IPPROTO_IGMP ||
1592 igmp_hdr(skb)->type != IGMP_MRDISC_ADV)
1593 return -ENOMSG;
1594
1595 br_multicast_mark_router(br, port);
1596
1597 return 0;
1598}
1599
eb1d1641
HX		 1600static int br_multicast_ipv4_rcv(struct net_bridge *br,
1601 struct net_bridge_port *port,
06499098
VY		 1602 struct sk_buff *skb,
1603 u16 vid)
eb1d1641 1604{
6db6f0ea 1605 const unsigned char *src;
eb1d1641 1606 struct igmphdr *ih;
eb1d1641
HX		 1607 int err;
1608
ba5ea614 1609 err = ip_mc_check_igmp(skb);
eb1d1641 1610
9afd85c9 1611 if (err == -ENOMSG) {
91b02d3d 1612 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
bd4265fe 1613 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
91b02d3d
NA		 1614 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1615 if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1616 br_multicast_pim(br, port, skb);
4b3087c7
LL		 1617 } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) {
1618 err = br_ip4_multicast_mrd_rcv(br, port, skb);
1619
1620 if (err < 0 && err != -ENOMSG) {
1621 br_multicast_err_count(br, port, skb->protocol);
1622 return err;
1623 }
91b02d3d 1624 }
4b3087c7 1625
eb1d1641 1626 return 0;
9afd85c9 1627 } else if (err < 0) {
1080ab95 1628 br_multicast_err_count(br, port, skb->protocol);
9afd85c9 1629 return err;
bd4265fe 1630 }
eb1d1641 1631
9afd85c9 1632 ih = igmp_hdr(skb);
6db6f0ea 1633 src = eth_hdr(skb)->h_source;
1080ab95 1634 BR_INPUT_SKB_CB(skb)->igmp = ih->type;
eb1d1641
HX		 1635
1636 switch (ih->type) {
1637 case IGMP_HOST_MEMBERSHIP_REPORT:
1638 case IGMPV2_HOST_MEMBERSHIP_REPORT:
62b2bcb4 1639 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
6db6f0ea 1640 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
eb1d1641
HX		 1641 break;
1642 case IGMPV3_HOST_MEMBERSHIP_REPORT:
ba5ea614 1643 err = br_ip4_multicast_igmp3_report(br, port, skb, vid);
eb1d1641
HX		 1644 break;
1645 case IGMP_HOST_MEMBERSHIP_QUERY:
ba5ea614 1646 br_ip4_multicast_query(br, port, skb, vid);
eb1d1641
HX		 1647 break;
1648 case IGMP_HOST_LEAVE_MESSAGE:
6db6f0ea 1649 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
eb1d1641
HX		 1650 break;
1651 }
1652
a65056ec 1653 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1080ab95
NA		 1654 BR_MCAST_DIR_RX);
1655
eb1d1641
HX		 1656 return err;
1657}
1658
dfd56b8b 1659#if IS_ENABLED(CONFIG_IPV6)
4b3087c7
LL		 1660static int br_ip6_multicast_mrd_rcv(struct net_bridge *br,
1661 struct net_bridge_port *port,
1662 struct sk_buff *skb)
1663{
1664 int ret;
1665
1666 if (ipv6_hdr(skb)->nexthdr != IPPROTO_ICMPV6)
1667 return -ENOMSG;
1668
1669 ret = ipv6_mc_check_icmpv6(skb);
1670 if (ret < 0)
1671 return ret;
1672
1673 if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV)
1674 return -ENOMSG;
1675
1676 br_multicast_mark_router(br, port);
1677
1678 return 0;
1679}
1680
08b202b6
YH		 1681static int br_multicast_ipv6_rcv(struct net_bridge *br,
1682 struct net_bridge_port *port,
06499098
VY		 1683 struct sk_buff *skb,
1684 u16 vid)
08b202b6 1685{
6db6f0ea 1686 const unsigned char *src;
9afd85c9 1687 struct mld_msg *mld;
08b202b6
YH		 1688 int err;
1689
ba5ea614 1690 err = ipv6_mc_check_mld(skb);
08b202b6 1691
9afd85c9
LL		 1692 if (err == -ENOMSG) {
1693 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1694 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
4b3087c7
LL		 1695
1696 if (ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr)) {
1697 err = br_ip6_multicast_mrd_rcv(br, port, skb);
1698
1699 if (err < 0 && err != -ENOMSG) {
1700 br_multicast_err_count(br, port, skb->protocol);
1701 return err;
1702 }
1703 }
1704
08b202b6 1705 return 0;
9afd85c9 1706 } else if (err < 0) {
1080ab95 1707 br_multicast_err_count(br, port, skb->protocol);
9afd85c9 1708 return err;
08b202b6
YH		 1709 }
1710
9afd85c9 1711 mld = (struct mld_msg *)skb_transport_header(skb);
1080ab95 1712 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
08b202b6 1713
9afd85c9 1714 switch (mld->mld_type) {
08b202b6 1715 case ICMPV6_MGM_REPORT:
6db6f0ea 1716 src = eth_hdr(skb)->h_source;
fc2af6c7 1717 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
6db6f0ea
FF		 1718 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
1719 src);
08b202b6 1720 break;
08b202b6 1721 case ICMPV6_MLD2_REPORT:
ba5ea614 1722 err = br_ip6_multicast_mld2_report(br, port, skb, vid);
08b202b6
YH		 1723 break;
1724 case ICMPV6_MGM_QUERY:
ba5ea614 1725 err = br_ip6_multicast_query(br, port, skb, vid);
08b202b6
YH		 1726 break;
1727 case ICMPV6_MGM_REDUCTION:
6db6f0ea
FF		 1728 src = eth_hdr(skb)->h_source;
1729 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
9afd85c9 1730 break;
08b202b6
YH		 1731 }
1732
a65056ec 1733 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1080ab95
NA		 1734 BR_MCAST_DIR_RX);
1735
08b202b6
YH		 1736 return err;
1737}
1738#endif
1739
eb1d1641 1740int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
06499098 1741 struct sk_buff *skb, u16 vid)
eb1d1641 1742{
1080ab95
NA		 1743 int ret = 0;
1744
1fafc7a9
YH		 1745 BR_INPUT_SKB_CB(skb)->igmp = 0;
1746 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1747
13cefad2 1748 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
eb1d1641
HX		 1749 return 0;
1750
1751 switch (skb->protocol) {
1752 case htons(ETH_P_IP):
1080ab95
NA		 1753 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1754 break;
dfd56b8b 1755#if IS_ENABLED(CONFIG_IPV6)
08b202b6 1756 case htons(ETH_P_IPV6):
1080ab95
NA		 1757 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1758 break;
08b202b6 1759#endif
eb1d1641
HX		 1760 }
1761
1080ab95 1762 return ret;
eb1d1641
HX		 1763}
1764
cc0fdd80 1765static void br_multicast_query_expired(struct net_bridge *br,
2cd41431
LL		 1766 struct bridge_mcast_own_query *query,
1767 struct bridge_mcast_querier *querier)
cc0fdd80
LL		 1768{
1769 spin_lock(&br->multicast_lock);
1770 if (query->startup_sent < br->multicast_startup_query_count)
1771 query->startup_sent++;
1772
71d9f614 1773 RCU_INIT_POINTER(querier->port, NULL);
cc0fdd80
LL		 1774 br_multicast_send_query(br, NULL, query);
1775 spin_unlock(&br->multicast_lock);
1776}
1777
88c1f37f 1778static void br_ip4_multicast_query_expired(struct timer_list *t)
eb1d1641 1779{
88c1f37f 1780 struct net_bridge *br = from_timer(br, t, ip4_own_query.timer);
eb1d1641 1781
2cd41431 1782 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
cc0fdd80 1783}
eb1d1641 1784
cc0fdd80 1785#if IS_ENABLED(CONFIG_IPV6)
88c1f37f 1786static void br_ip6_multicast_query_expired(struct timer_list *t)
cc0fdd80 1787{
88c1f37f 1788 struct net_bridge *br = from_timer(br, t, ip6_own_query.timer);
eb1d1641 1789
2cd41431 1790 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
eb1d1641 1791}
cc0fdd80 1792#endif
eb1d1641
HX		 1793
1794void br_multicast_init(struct net_bridge *br)
1795{
d08c6bc0 1796 br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX;
eb1d1641 1797
7f0aec7a 1798 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
eb1d1641
HX		 1799 br->multicast_last_member_count = 2;
1800 br->multicast_startup_query_count = 2;
1801
1802 br->multicast_last_member_interval = HZ;
1803 br->multicast_query_response_interval = 10 * HZ;
1804 br->multicast_startup_query_interval = 125 * HZ / 4;
1805 br->multicast_query_interval = 125 * HZ;
1806 br->multicast_querier_interval = 255 * HZ;
1807 br->multicast_membership_interval = 260 * HZ;
1808
90010b36 1809 br->ip4_other_query.delay_time = 0;
2cd41431 1810 br->ip4_querier.port = NULL;
aa2ae3e7 1811 br->multicast_igmp_version = 2;
cc0fdd80 1812#if IS_ENABLED(CONFIG_IPV6)
aa2ae3e7 1813 br->multicast_mld_version = 1;
90010b36 1814 br->ip6_other_query.delay_time = 0;
2cd41431 1815 br->ip6_querier.port = NULL;
cc0fdd80 1816#endif
6919622a 1817 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true);
675779ad 1818 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
b00589af 1819
eb1d1641 1820 spin_lock_init(&br->multicast_lock);
88c1f37f
AP		 1821 timer_setup(&br->multicast_router_timer,
1822 br_multicast_local_router_expired, 0);
1823 timer_setup(&br->ip4_other_query.timer,
1824 br_ip4_multicast_querier_expired, 0);
1825 timer_setup(&br->ip4_own_query.timer,
1826 br_ip4_multicast_query_expired, 0);
cc0fdd80 1827#if IS_ENABLED(CONFIG_IPV6)
88c1f37f
AP		 1828 timer_setup(&br->ip6_other_query.timer,
1829 br_ip6_multicast_querier_expired, 0);
1830 timer_setup(&br->ip6_own_query.timer,
1831 br_ip6_multicast_query_expired, 0);
cc0fdd80 1832#endif
19e3a9c9 1833 INIT_HLIST_HEAD(&br->mdb_list);
eb1d1641
HX		 1834}
1835
4effd28c
LL		 1836static void br_ip4_multicast_join_snoopers(struct net_bridge *br)
1837{
1838 struct in_device *in_dev = in_dev_get(br->dev);
1839
1840 if (!in_dev)
1841 return;
1842
9fb20801 1843 __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
4effd28c
LL		 1844 in_dev_put(in_dev);
1845}
1846
1847#if IS_ENABLED(CONFIG_IPV6)
1848static void br_ip6_multicast_join_snoopers(struct net_bridge *br)
1849{
1850 struct in6_addr addr;
1851
1852 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
1853 ipv6_dev_mc_inc(br->dev, &addr);
1854}
1855#else
1856static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br)
1857{
1858}
1859#endif
1860
1861static void br_multicast_join_snoopers(struct net_bridge *br)
1862{
1863 br_ip4_multicast_join_snoopers(br);
1864 br_ip6_multicast_join_snoopers(br);
1865}
1866
1867static void br_ip4_multicast_leave_snoopers(struct net_bridge *br)
1868{
1869 struct in_device *in_dev = in_dev_get(br->dev);
1870
1871 if (WARN_ON(!in_dev))
1872 return;
1873
9fb20801 1874 __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
4effd28c
LL		 1875 in_dev_put(in_dev);
1876}
1877
1878#if IS_ENABLED(CONFIG_IPV6)
1879static void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
1880{
1881 struct in6_addr addr;
1882
1883 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
1884 ipv6_dev_mc_dec(br->dev, &addr);
1885}
1886#else
1887static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
1888{
1889}
1890#endif
1891
1892static void br_multicast_leave_snoopers(struct net_bridge *br)
1893{
1894 br_ip4_multicast_leave_snoopers(br);
1895 br_ip6_multicast_leave_snoopers(br);
1896}
1897
cc0fdd80 1898static void __br_multicast_open(struct net_bridge *br,
90010b36 1899 struct bridge_mcast_own_query *query)
eb1d1641 1900{
cc0fdd80 1901 query->startup_sent = 0;
eb1d1641 1902
13cefad2 1903 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
eb1d1641
HX		 1904 return;
1905
cc0fdd80
LL		 1906 mod_timer(&query->timer, jiffies);
1907}
1908
1909void br_multicast_open(struct net_bridge *br)
1910{
4effd28c
LL		 1911 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
1912 br_multicast_join_snoopers(br);
1913
90010b36 1914 __br_multicast_open(br, &br->ip4_own_query);
cc0fdd80 1915#if IS_ENABLED(CONFIG_IPV6)
90010b36 1916 __br_multicast_open(br, &br->ip6_own_query);
cc0fdd80 1917#endif
eb1d1641
HX		 1918}
1919
1920void br_multicast_stop(struct net_bridge *br)
1921{
eb1d1641 1922 del_timer_sync(&br->multicast_router_timer);
90010b36
LL		 1923 del_timer_sync(&br->ip4_other_query.timer);
1924 del_timer_sync(&br->ip4_own_query.timer);
cc0fdd80 1925#if IS_ENABLED(CONFIG_IPV6)
90010b36
LL		 1926 del_timer_sync(&br->ip6_other_query.timer);
1927 del_timer_sync(&br->ip6_own_query.timer);
cc0fdd80 1928#endif
4effd28c
LL		 1929
1930 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
1931 br_multicast_leave_snoopers(br);
e10177ab
SA		 1932}
1933
1934void br_multicast_dev_del(struct net_bridge *br)
1935{
e10177ab 1936 struct net_bridge_mdb_entry *mp;
19e3a9c9 1937 struct hlist_node *tmp;
eb1d1641
HX		 1938
1939 spin_lock_bh(&br->multicast_lock);
19e3a9c9
NA		 1940 hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node) {
1941 del_timer(&mp->timer);
1942 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
1943 br_mdb_rht_params);
1944 hlist_del_rcu(&mp->mdb_node);
4329596c 1945 kfree_rcu(mp, rcu);
eb1d1641 1946 }
eb1d1641 1947 spin_unlock_bh(&br->multicast_lock);
19e3a9c9 1948
4329596c 1949 rcu_barrier();
eb1d1641 1950}
0909e117
HX		 1951
1952int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1953{
6ae4ae8e 1954 int err = -EINVAL;
0909e117
HX		 1955
1956 spin_lock_bh(&br->multicast_lock);
0909e117
HX		 1957
1958 switch (val) {
7f0aec7a
NA		 1959 case MDB_RTR_TYPE_DISABLED:
1960 case MDB_RTR_TYPE_PERM:
77041420 1961 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM);
0909e117 1962 del_timer(&br->multicast_router_timer);
77041420
YG		 1963 br->multicast_router = val;
1964 err = 0;
1965 break;
7f0aec7a 1966 case MDB_RTR_TYPE_TEMP_QUERY:
77041420
YG		 1967 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
1968 br_mc_router_state_change(br, false);
0909e117
HX		 1969 br->multicast_router = val;
1970 err = 0;
1971 break;
0909e117
HX		 1972 }
1973
0909e117
HX		 1974 spin_unlock_bh(&br->multicast_lock);
1975
1976 return err;
1977}
1978
7f0aec7a
NA		 1979static void __del_port_router(struct net_bridge_port *p)
1980{
1981 if (hlist_unhashed(&p->rlist))
1982 return;
1983 hlist_del_init_rcu(&p->rlist);
1984 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
6d549648 1985 br_port_mc_router_state_change(p, false);
f12e7d95
NF		 1986
1987 /* don't allow timer refresh */
1988 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1989 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
7f0aec7a
NA		 1990}
1991
0909e117
HX		 1992int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1993{
1994 struct net_bridge *br = p->br;
a55d8246 1995 unsigned long now = jiffies;
6ae4ae8e 1996 int err = -EINVAL;
0909e117
HX		 1997
1998 spin_lock(&br->multicast_lock);
4950cfd1 1999 if (p->multicast_router == val) {
a55d8246
NA		 2000 /* Refresh the temp router port timer */
2001 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2002 mod_timer(&p->multicast_router_timer,
2003 now + br->multicast_querier_interval);
4950cfd1
NA		 2004 err = 0;
2005 goto unlock;
2006 }
0909e117 2007 switch (val) {
7f0aec7a
NA		 2008 case MDB_RTR_TYPE_DISABLED:
2009 p->multicast_router = MDB_RTR_TYPE_DISABLED;
2010 __del_port_router(p);
2011 del_timer(&p->multicast_router_timer);
2012 break;
2013 case MDB_RTR_TYPE_TEMP_QUERY:
2014 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2015 __del_port_router(p);
2016 break;
2017 case MDB_RTR_TYPE_PERM:
2018 p->multicast_router = MDB_RTR_TYPE_PERM;
0909e117 2019 del_timer(&p->multicast_router_timer);
0909e117
HX		 2020 br_multicast_add_router(br, p);
2021 break;
a55d8246
NA		 2022 case MDB_RTR_TYPE_TEMP:
2023 p->multicast_router = MDB_RTR_TYPE_TEMP;
2024 br_multicast_mark_router(br, p);
2025 break;
7f0aec7a
NA		 2026 default:
2027 goto unlock;
0909e117 2028 }
7f0aec7a
NA		 2029 err = 0;
2030unlock:
0909e117
HX		 2031 spin_unlock(&br->multicast_lock);
2032
2033 return err;
2034}
561f1103 2035
cc0fdd80 2036static void br_multicast_start_querier(struct net_bridge *br,
90010b36 2037 struct bridge_mcast_own_query *query)
561f1103
HX		 2038{
2039 struct net_bridge_port *port;
74857216 2040
cc0fdd80 2041 __br_multicast_open(br, query);
74857216
HX		 2042
2043 list_for_each_entry(port, &br->port_list, list) {
2044 if (port->state == BR_STATE_DISABLED ||
2045 port->state == BR_STATE_BLOCKING)
2046 continue;
2047
90010b36
LL		 2048 if (query == &br->ip4_own_query)
2049 br_multicast_enable(&port->ip4_own_query);
cc0fdd80
LL		 2050#if IS_ENABLED(CONFIG_IPV6)
2051 else
90010b36 2052 br_multicast_enable(&port->ip6_own_query);
cc0fdd80 2053#endif
74857216
HX		 2054 }
2055}
2056
2057int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2058{
7cb3f921 2059 struct net_bridge_port *port;
561f1103 2060
ef5e0d82 2061 spin_lock_bh(&br->multicast_lock);
13cefad2 2062 if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val)
561f1103
HX		 2063 goto unlock;
2064
13cefad2
NA		 2065 br_mc_disabled_update(br->dev, val);
2066 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val);
4effd28c
LL		 2067 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) {
2068 br_multicast_leave_snoopers(br);
561f1103 2069 goto unlock;
4effd28c 2070 }
561f1103 2071
3a7fda06
HX		 2072 if (!netif_running(br->dev))
2073 goto unlock;
2074
7cb3f921
NA		 2075 br_multicast_open(br);
2076 list_for_each_entry(port, &br->port_list, list)
2077 __br_multicast_enable_port(port);
561f1103
HX		 2078
2079unlock:
ef5e0d82 2080 spin_unlock_bh(&br->multicast_lock);
561f1103 2081
a26d94bf 2082 return 0;
561f1103 2083}
b195167f 2084
9341b988
IS		 2085bool br_multicast_enabled(const struct net_device *dev)
2086{
2087 struct net_bridge *br = netdev_priv(dev);
2088
13cefad2 2089 return !!br_opt_get(br, BROPT_MULTICAST_ENABLED);
9341b988
IS		 2090}
2091EXPORT_SYMBOL_GPL(br_multicast_enabled);
2092
0912bda4
YG		 2093bool br_multicast_router(const struct net_device *dev)
2094{
2095 struct net_bridge *br = netdev_priv(dev);
2096 bool is_router;
2097
2098 spin_lock_bh(&br->multicast_lock);
2099 is_router = br_multicast_is_router(br);
2100 spin_unlock_bh(&br->multicast_lock);
2101 return is_router;
2102}
2103EXPORT_SYMBOL_GPL(br_multicast_router);
2104
c5c23260
HX		 2105int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2106{
b00589af
LL		 2107 unsigned long max_delay;
2108
c5c23260
HX		 2109 val = !!val;
2110
2111 spin_lock_bh(&br->multicast_lock);
675779ad 2112 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val)
c5c23260
HX		 2113 goto unlock;
2114
675779ad 2115 br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val);
b00589af
LL		 2116 if (!val)
2117 goto unlock;
2118
2119 max_delay = br->multicast_query_response_interval;
b00589af 2120
90010b36
LL		 2121 if (!timer_pending(&br->ip4_other_query.timer))
2122 br->ip4_other_query.delay_time = jiffies + max_delay;
cc0fdd80 2123
90010b36 2124 br_multicast_start_querier(br, &br->ip4_own_query);
cc0fdd80
LL		 2125
2126#if IS_ENABLED(CONFIG_IPV6)
90010b36
LL		 2127 if (!timer_pending(&br->ip6_other_query.timer))
2128 br->ip6_other_query.delay_time = jiffies + max_delay;
cc0fdd80 2129
90010b36 2130 br_multicast_start_querier(br, &br->ip6_own_query);
cc0fdd80 2131#endif
c5c23260
HX		 2132
2133unlock:
2134 spin_unlock_bh(&br->multicast_lock);
2135
2136 return 0;
2137}
2138
5e923585
NA		 2139int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2140{
2141 /* Currently we support only version 2 and 3 */
2142 switch (val) {
2143 case 2:
2144 case 3:
2145 break;
2146 default:
2147 return -EINVAL;
2148 }
2149
2150 spin_lock_bh(&br->multicast_lock);
2151 br->multicast_igmp_version = val;
2152 spin_unlock_bh(&br->multicast_lock);
2153
2154 return 0;
2155}
2156
aa2ae3e7
NA		 2157#if IS_ENABLED(CONFIG_IPV6)
2158int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2159{
2160 /* Currently we support version 1 and 2 */
2161 switch (val) {
2162 case 1:
2163 case 2:
2164 break;
2165 default:
2166 return -EINVAL;
2167 }
2168
2169 spin_lock_bh(&br->multicast_lock);
2170 br->multicast_mld_version = val;
2171 spin_unlock_bh(&br->multicast_lock);
2172
2173 return 0;
2174}
2175#endif
2176
07f8ac4a
LL		 2177/**
2178 * br_multicast_list_adjacent - Returns snooped multicast addresses
2179 * @dev: The bridge port adjacent to which to retrieve addresses
2180 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2181 *
2182 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2183 * snooping feature on all bridge ports of dev's bridge device, excluding
2184 * the addresses from dev itself.
2185 *
2186 * Returns the number of items added to br_ip_list.
2187 *
2188 * Notes:
2189 * - br_ip_list needs to be initialized by caller
2190 * - br_ip_list might contain duplicates in the end
2191 * (needs to be taken care of by caller)
2192 * - br_ip_list needs to be freed by caller
2193 */
2194int br_multicast_list_adjacent(struct net_device *dev,
2195 struct list_head *br_ip_list)
2196{
2197 struct net_bridge *br;
2198 struct net_bridge_port *port;
2199 struct net_bridge_port_group *group;
2200 struct br_ip_list *entry;
2201 int count = 0;
2202
2203 rcu_read_lock();
2204 if (!br_ip_list || !br_port_exists(dev))
2205 goto unlock;
2206
2207 port = br_port_get_rcu(dev);
2208 if (!port || !port->br)
2209 goto unlock;
2210
2211 br = port->br;
2212
2213 list_for_each_entry_rcu(port, &br->port_list, list) {
2214 if (!port->dev || port->dev == dev)
2215 continue;
2216
2217 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2218 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2219 if (!entry)
2220 goto unlock;
2221
2222 entry->addr = group->addr;
2223 list_add(&entry->list, br_ip_list);
2224 count++;
2225 }
2226 }
2227
2228unlock:
2229 rcu_read_unlock();
2230 return count;
2231}
2232EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2cd41431 2233
c34963e2
LL		 2234/**
2235 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2236 * @dev: The bridge port providing the bridge on which to check for a querier
2237 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2238 *
2239 * Checks whether the given interface has a bridge on top and if so returns
2240 * true if a valid querier exists anywhere on the bridged link layer.
2241 * Otherwise returns false.
2242 */
2243bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2244{
2245 struct net_bridge *br;
2246 struct net_bridge_port *port;
2247 struct ethhdr eth;
2248 bool ret = false;
2249
2250 rcu_read_lock();
2251 if (!br_port_exists(dev))
2252 goto unlock;
2253
2254 port = br_port_get_rcu(dev);
2255 if (!port || !port->br)
2256 goto unlock;
2257
2258 br = port->br;
2259
2260 memset(&eth, 0, sizeof(eth));
2261 eth.h_proto = htons(proto);
2262
2263 ret = br_multicast_querier_exists(br, &eth);
2264
2265unlock:
2266 rcu_read_unlock();
2267 return ret;
2268}
2269EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2270
2cd41431
LL		 2271/**
2272 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2273 * @dev: The bridge port adjacent to which to check for a querier
2274 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2275 *
2276 * Checks whether the given interface has a bridge on top and if so returns
2277 * true if a selected querier is behind one of the other ports of this
2278 * bridge. Otherwise returns false.
2279 */
2280bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2281{
2282 struct net_bridge *br;
2283 struct net_bridge_port *port;
2284 bool ret = false;
2285
2286 rcu_read_lock();
2287 if (!br_port_exists(dev))
2288 goto unlock;
2289
2290 port = br_port_get_rcu(dev);
2291 if (!port || !port->br)
2292 goto unlock;
2293
2294 br = port->br;
2295
2296 switch (proto) {
2297 case ETH_P_IP:
2298 if (!timer_pending(&br->ip4_other_query.timer) ||
2299 rcu_dereference(br->ip4_querier.port) == port)
2300 goto unlock;
2301 break;
3993c4e1 2302#if IS_ENABLED(CONFIG_IPV6)
2cd41431
LL		 2303 case ETH_P_IPV6:
2304 if (!timer_pending(&br->ip6_other_query.timer) ||
2305 rcu_dereference(br->ip6_querier.port) == port)
2306 goto unlock;
2307 break;
3993c4e1 2308#endif
2cd41431
LL		 2309 default:
2310 goto unlock;
2311 }
2312
2313 ret = true;
2314unlock:
2315 rcu_read_unlock();
2316 return ret;
2317}
2318EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
1080ab95
NA		 2319
2320static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
a65056ec 2321 const struct sk_buff *skb, u8 type, u8 dir)
1080ab95
NA		 2322{
2323 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
a65056ec
NA		 2324 __be16 proto = skb->protocol;
2325 unsigned int t_len;
1080ab95
NA		 2326
2327 u64_stats_update_begin(&pstats->syncp);
2328 switch (proto) {
2329 case htons(ETH_P_IP):
a65056ec 2330 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
1080ab95
NA		 2331 switch (type) {
2332 case IGMP_HOST_MEMBERSHIP_REPORT:
2333 pstats->mstats.igmp_v1reports[dir]++;
2334 break;
2335 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2336 pstats->mstats.igmp_v2reports[dir]++;
2337 break;
2338 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2339 pstats->mstats.igmp_v3reports[dir]++;
2340 break;
2341 case IGMP_HOST_MEMBERSHIP_QUERY:
a65056ec
NA		 2342 if (t_len != sizeof(struct igmphdr)) {
2343 pstats->mstats.igmp_v3queries[dir]++;
2344 } else {
2345 unsigned int offset = skb_transport_offset(skb);
2346 struct igmphdr *ih, _ihdr;
2347
2348 ih = skb_header_pointer(skb, offset,
2349 sizeof(_ihdr), &_ihdr);
2350 if (!ih)
2351 break;
2352 if (!ih->code)
2353 pstats->mstats.igmp_v1queries[dir]++;
2354 else
2355 pstats->mstats.igmp_v2queries[dir]++;
2356 }
1080ab95
NA		 2357 break;
2358 case IGMP_HOST_LEAVE_MESSAGE:
2359 pstats->mstats.igmp_leaves[dir]++;
2360 break;
2361 }
2362 break;
2363#if IS_ENABLED(CONFIG_IPV6)
2364 case htons(ETH_P_IPV6):
a65056ec
NA		 2365 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2366 sizeof(struct ipv6hdr);
2367 t_len -= skb_network_header_len(skb);
1080ab95
NA		 2368 switch (type) {
2369 case ICMPV6_MGM_REPORT:
2370 pstats->mstats.mld_v1reports[dir]++;
2371 break;
2372 case ICMPV6_MLD2_REPORT:
2373 pstats->mstats.mld_v2reports[dir]++;
2374 break;
2375 case ICMPV6_MGM_QUERY:
a65056ec
NA		 2376 if (t_len != sizeof(struct mld_msg))
2377 pstats->mstats.mld_v2queries[dir]++;
2378 else
2379 pstats->mstats.mld_v1queries[dir]++;
1080ab95
NA		 2380 break;
2381 case ICMPV6_MGM_REDUCTION:
2382 pstats->mstats.mld_leaves[dir]++;
2383 break;
2384 }
2385 break;
2386#endif /* CONFIG_IPV6 */
2387 }
2388 u64_stats_update_end(&pstats->syncp);
2389}
2390
2391void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
a65056ec 2392 const struct sk_buff *skb, u8 type, u8 dir)
1080ab95
NA		 2393{
2394 struct bridge_mcast_stats __percpu *stats;
2395
2396 /* if multicast_disabled is true then igmp type can't be set */
675779ad 2397 if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
1080ab95
NA		 2398 return;
2399
2400 if (p)
2401 stats = p->mcast_stats;
2402 else
2403 stats = br->mcast_stats;
2404 if (WARN_ON(!stats))
2405 return;
2406
a65056ec 2407 br_mcast_stats_add(stats, skb, type, dir);
1080ab95
NA		 2408}
2409
2410int br_multicast_init_stats(struct net_bridge *br)
2411{
2412 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2413 if (!br->mcast_stats)
2414 return -ENOMEM;
2415
2416 return 0;
2417}
2418
b6fe0440
IS		 2419void br_multicast_uninit_stats(struct net_bridge *br)
2420{
2421 free_percpu(br->mcast_stats);
2422}
2423
1080ab95
NA		 2424static void mcast_stats_add_dir(u64 *dst, u64 *src)
2425{
2426 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2427 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2428}
2429
2430void br_multicast_get_stats(const struct net_bridge *br,
2431 const struct net_bridge_port *p,
2432 struct br_mcast_stats *dest)
2433{
2434 struct bridge_mcast_stats __percpu *stats;
2435 struct br_mcast_stats tdst;
2436 int i;
2437
2438 memset(dest, 0, sizeof(*dest));
2439 if (p)
2440 stats = p->mcast_stats;
2441 else
2442 stats = br->mcast_stats;
2443 if (WARN_ON(!stats))
2444 return;
2445
2446 memset(&tdst, 0, sizeof(tdst));
2447 for_each_possible_cpu(i) {
2448 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2449 struct br_mcast_stats temp;
2450 unsigned int start;
2451
2452 do {
2453 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2454 memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2455 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2456
a65056ec
NA		 2457 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2458 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2459 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
1080ab95
NA		 2460 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2461 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2462 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2463 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2464 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2465
a65056ec
NA		 2466 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2467 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
1080ab95
NA		 2468 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2469 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2470 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2471 tdst.mld_parse_errors += temp.mld_parse_errors;
2472 }
2473 memcpy(dest, &tdst, sizeof(*dest));
2474}
19e3a9c9
NA		 2475
2476int br_mdb_hash_init(struct net_bridge *br)
2477{
2478 return rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params);
2479}
2480
2481void br_mdb_hash_fini(struct net_bridge *br)
2482{
2483 rhashtable_destroy(&br->mdb_hash_tbl);
2484}
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git