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Merge tag 'drm/tegra/for-5.1-rc5' of git://anongit.freedesktop.org/tegra/linux into...
[thirdparty/kernel/stable.git] / net / bridge / br_multicast.c
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
1515a63f 604 memset(&br_group, 0, sizeof(br_group));
8ef2a9a5
YH		 605 br_group.u.ip4 = group;
606 br_group.proto = htons(ETH_P_IP);
b0e9a30d 607 br_group.vid = vid;
8ef2a9a5 608
6db6f0ea 609 return br_multicast_add_group(br, port, &br_group, src);
8ef2a9a5
YH		 610}
611
dfd56b8b 612#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 613static int br_ip6_multicast_add_group(struct net_bridge *br,
614 struct net_bridge_port *port,
b0e9a30d 615 const struct in6_addr *group,
6db6f0ea
FF		 616 __u16 vid,
617 const unsigned char *src)
08b202b6
YH		 618{
619 struct br_ip br_group;
620
3c3769e6 621 if (ipv6_addr_is_ll_all_nodes(group))
08b202b6
YH		 622 return 0;
623
19e3a9c9 624 memset(&br_group, 0, sizeof(br_group));
4e3fd7a0 625 br_group.u.ip6 = *group;
9cc6e0c4 626 br_group.proto = htons(ETH_P_IPV6);
b0e9a30d 627 br_group.vid = vid;
08b202b6 628
6db6f0ea 629 return br_multicast_add_group(br, port, &br_group, src);
08b202b6
YH		 630}
631#endif
632
88c1f37f 633static void br_multicast_router_expired(struct timer_list *t)
eb1d1641 634{
88c1f37f
AP		 635 struct net_bridge_port *port =
636 from_timer(port, t, multicast_router_timer);
eb1d1641
HX		 637 struct net_bridge *br = port->br;
638
639 spin_lock(&br->multicast_lock);
a55d8246
NA		 640 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
641 port->multicast_router == MDB_RTR_TYPE_PERM ||
f12e7d95 642 timer_pending(&port->multicast_router_timer))
eb1d1641
HX		 643 goto out;
644
f12e7d95 645 __del_port_router(port);
eb1d1641
HX		 646out:
647 spin_unlock(&br->multicast_lock);
648}
649
77041420
YG		 650static void br_mc_router_state_change(struct net_bridge *p,
651 bool is_mc_router)
652{
653 struct switchdev_attr attr = {
654 .orig_dev = p->dev,
655 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
656 .flags = SWITCHDEV_F_DEFER,
657 .u.mrouter = is_mc_router,
658 };
659
660 switchdev_port_attr_set(p->dev, &attr);
661}
662
88c1f37f 663static void br_multicast_local_router_expired(struct timer_list *t)
eb1d1641 664{
88c1f37f 665 struct net_bridge *br = from_timer(br, t, multicast_router_timer);
77041420
YG		 666
667 spin_lock(&br->multicast_lock);
668 if (br->multicast_router == MDB_RTR_TYPE_DISABLED ||
669 br->multicast_router == MDB_RTR_TYPE_PERM ||
670 timer_pending(&br->multicast_router_timer))
671 goto out;
672
673 br_mc_router_state_change(br, false);
674out:
675 spin_unlock(&br->multicast_lock);
eb1d1641
HX		 676}
677
cc0fdd80 678static void br_multicast_querier_expired(struct net_bridge *br,
90010b36 679 struct bridge_mcast_own_query *query)
c83b8fab 680{
c83b8fab 681 spin_lock(&br->multicast_lock);
13cefad2 682 if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
c83b8fab
HX		 683 goto out;
684
cc0fdd80 685 br_multicast_start_querier(br, query);
c83b8fab
HX		 686
687out:
688 spin_unlock(&br->multicast_lock);
689}
690
88c1f37f 691static void br_ip4_multicast_querier_expired(struct timer_list *t)
cc0fdd80 692{
88c1f37f 693 struct net_bridge *br = from_timer(br, t, ip4_other_query.timer);
cc0fdd80 694
90010b36 695 br_multicast_querier_expired(br, &br->ip4_own_query);
cc0fdd80
LL		 696}
697
698#if IS_ENABLED(CONFIG_IPV6)
88c1f37f 699static void br_ip6_multicast_querier_expired(struct timer_list *t)
cc0fdd80 700{
88c1f37f 701 struct net_bridge *br = from_timer(br, t, ip6_other_query.timer);
cc0fdd80 702
90010b36 703 br_multicast_querier_expired(br, &br->ip6_own_query);
cc0fdd80
LL		 704}
705#endif
706
dc4eb53a
LL		 707static void br_multicast_select_own_querier(struct net_bridge *br,
708 struct br_ip *ip,
709 struct sk_buff *skb)
710{
711 if (ip->proto == htons(ETH_P_IP))
712 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
713#if IS_ENABLED(CONFIG_IPV6)
714 else
715 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
716#endif
717}
718
8ef2a9a5
YH		 719static void __br_multicast_send_query(struct net_bridge *br,
720 struct net_bridge_port *port,
721 struct br_ip *ip)
eb1d1641 722{
eb1d1641 723 struct sk_buff *skb;
1080ab95 724 u8 igmp_type;
eb1d1641 725
1080ab95 726 skb = br_multicast_alloc_query(br, ip, &igmp_type);
eb1d1641 727 if (!skb)
8ef2a9a5 728 return;
eb1d1641
HX		 729
730 if (port) {
eb1d1641 731 skb->dev = port->dev;
a65056ec 732 br_multicast_count(br, port, skb, igmp_type,
1080ab95 733 BR_MCAST_DIR_TX);
29a26a56
EB		 734 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
735 dev_net(port->dev), NULL, skb, NULL, skb->dev,
f0b4eece 736 br_dev_queue_push_xmit);
dc4eb53a
LL		 737 } else {
738 br_multicast_select_own_querier(br, ip, skb);
a65056ec 739 br_multicast_count(br, port, skb, igmp_type,
1080ab95 740 BR_MCAST_DIR_RX);
eb1d1641 741 netif_rx(skb);
dc4eb53a 742 }
8ef2a9a5
YH		 743}
744
745static void br_multicast_send_query(struct net_bridge *br,
cc0fdd80 746 struct net_bridge_port *port,
90010b36 747 struct bridge_mcast_own_query *own_query)
8ef2a9a5 748{
90010b36 749 struct bridge_mcast_other_query *other_query = NULL;
5e923585
NA		 750 struct br_ip br_group;
751 unsigned long time;
8ef2a9a5 752
13cefad2
NA		 753 if (!netif_running(br->dev) ||
754 !br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
675779ad 755 !br_opt_get(br, BROPT_MULTICAST_QUERIER))
8ef2a9a5
YH		 756 return;
757
08b202b6
YH		 758 memset(&br_group.u, 0, sizeof(br_group.u));
759
90010b36
LL		 760 if (port ? (own_query == &port->ip4_own_query) :
761 (own_query == &br->ip4_own_query)) {
762 other_query = &br->ip4_other_query;
cc0fdd80 763 br_group.proto = htons(ETH_P_IP);
dfd56b8b 764#if IS_ENABLED(CONFIG_IPV6)
cc0fdd80 765 } else {
90010b36 766 other_query = &br->ip6_other_query;
cc0fdd80 767 br_group.proto = htons(ETH_P_IPV6);
08b202b6 768#endif
cc0fdd80
LL		 769 }
770
90010b36 771 if (!other_query || timer_pending(&other_query->timer))
cc0fdd80
LL		 772 return;
773
774 __br_multicast_send_query(br, port, &br_group);
eb1d1641 775
eb1d1641 776 time = jiffies;
90010b36 777 time += own_query->startup_sent < br->multicast_startup_query_count ?
eb1d1641
HX		 778 br->multicast_startup_query_interval :
779 br->multicast_query_interval;
90010b36 780 mod_timer(&own_query->timer, time);
eb1d1641
HX		 781}
782
90010b36
LL		 783static void
784br_multicast_port_query_expired(struct net_bridge_port *port,
785 struct bridge_mcast_own_query *query)
eb1d1641 786{
eb1d1641
HX		 787 struct net_bridge *br = port->br;
788
789 spin_lock(&br->multicast_lock);
02a780c0
DC		 790 if (port->state == BR_STATE_DISABLED ||
791 port->state == BR_STATE_BLOCKING)
eb1d1641
HX		 792 goto out;
793
cc0fdd80
LL		 794 if (query->startup_sent < br->multicast_startup_query_count)
795 query->startup_sent++;
eb1d1641 796
cc0fdd80 797 br_multicast_send_query(port->br, port, query);
eb1d1641
HX		 798
799out:
800 spin_unlock(&br->multicast_lock);
801}
802
88c1f37f 803static void br_ip4_multicast_port_query_expired(struct timer_list *t)
cc0fdd80 804{
88c1f37f 805 struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer);
cc0fdd80 806
90010b36 807 br_multicast_port_query_expired(port, &port->ip4_own_query);
cc0fdd80
LL		 808}
809
810#if IS_ENABLED(CONFIG_IPV6)
88c1f37f 811static void br_ip6_multicast_port_query_expired(struct timer_list *t)
cc0fdd80 812{
88c1f37f 813 struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer);
cc0fdd80 814
90010b36 815 br_multicast_port_query_expired(port, &port->ip6_own_query);
cc0fdd80
LL		 816}
817#endif
818
147c1e9b
NF		 819static void br_mc_disabled_update(struct net_device *dev, bool value)
820{
821 struct switchdev_attr attr = {
822 .orig_dev = dev,
823 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
824 .flags = SWITCHDEV_F_DEFER,
13cefad2 825 .u.mc_disabled = !value,
147c1e9b
NF		 826 };
827
828 switchdev_port_attr_set(dev, &attr);
829}
830
1080ab95 831int br_multicast_add_port(struct net_bridge_port *port)
eb1d1641 832{
7f0aec7a 833 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
eb1d1641 834
88c1f37f
AP		 835 timer_setup(&port->multicast_router_timer,
836 br_multicast_router_expired, 0);
837 timer_setup(&port->ip4_own_query.timer,
838 br_ip4_multicast_port_query_expired, 0);
cc0fdd80 839#if IS_ENABLED(CONFIG_IPV6)
88c1f37f
AP		 840 timer_setup(&port->ip6_own_query.timer,
841 br_ip6_multicast_port_query_expired, 0);
cc0fdd80 842#endif
13cefad2
NA		 843 br_mc_disabled_update(port->dev,
844 br_opt_get(port->br, BROPT_MULTICAST_ENABLED));
147c1e9b 845
1080ab95
NA		 846 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
847 if (!port->mcast_stats)
848 return -ENOMEM;
849
850 return 0;
eb1d1641
HX		 851}
852
853void br_multicast_del_port(struct net_bridge_port *port)
854{
e10177ab
SA		 855 struct net_bridge *br = port->br;
856 struct net_bridge_port_group *pg;
857 struct hlist_node *n;
858
859 /* Take care of the remaining groups, only perm ones should be left */
860 spin_lock_bh(&br->multicast_lock);
861 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
862 br_multicast_del_pg(br, pg);
863 spin_unlock_bh(&br->multicast_lock);
eb1d1641 864 del_timer_sync(&port->multicast_router_timer);
1080ab95 865 free_percpu(port->mcast_stats);
eb1d1641
HX		 866}
867
90010b36 868static void br_multicast_enable(struct bridge_mcast_own_query *query)
561f1103 869{
cc0fdd80 870 query->startup_sent = 0;
561f1103 871
cc0fdd80
LL		 872 if (try_to_del_timer_sync(&query->timer) >= 0 ||
873 del_timer(&query->timer))
874 mod_timer(&query->timer, jiffies);
561f1103
HX		 875}
876
7cb3f921 877static void __br_multicast_enable_port(struct net_bridge_port *port)
eb1d1641
HX		 878{
879 struct net_bridge *br = port->br;
880
13cefad2 881 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || !netif_running(br->dev))
7cb3f921 882 return;
eb1d1641 883
90010b36 884 br_multicast_enable(&port->ip4_own_query);
cc0fdd80 885#if IS_ENABLED(CONFIG_IPV6)
90010b36 886 br_multicast_enable(&port->ip6_own_query);
cc0fdd80 887#endif
7f0aec7a
NA		 888 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
889 hlist_unhashed(&port->rlist))
754bc547 890 br_multicast_add_router(br, port);
7cb3f921 891}
eb1d1641 892
7cb3f921
NA		 893void br_multicast_enable_port(struct net_bridge_port *port)
894{
895 struct net_bridge *br = port->br;
896
897 spin_lock(&br->multicast_lock);
898 __br_multicast_enable_port(port);
eb1d1641
HX		 899 spin_unlock(&br->multicast_lock);
900}
901
902void br_multicast_disable_port(struct net_bridge_port *port)
903{
904 struct net_bridge *br = port->br;
905 struct net_bridge_port_group *pg;
b67bfe0d 906 struct hlist_node *n;
eb1d1641
HX		 907
908 spin_lock(&br->multicast_lock);
b67bfe0d 909 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
9d06b6d8 910 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
e10177ab 911 br_multicast_del_pg(br, pg);
eb1d1641 912
f12e7d95
NF		 913 __del_port_router(port);
914
eb1d1641 915 del_timer(&port->multicast_router_timer);
90010b36 916 del_timer(&port->ip4_own_query.timer);
cc0fdd80 917#if IS_ENABLED(CONFIG_IPV6)
90010b36 918 del_timer(&port->ip6_own_query.timer);
cc0fdd80 919#endif
eb1d1641
HX		 920 spin_unlock(&br->multicast_lock);
921}
922
8ef2a9a5
YH		 923static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
924 struct net_bridge_port *port,
06499098
VY		 925 struct sk_buff *skb,
926 u16 vid)
eb1d1641 927{
6db6f0ea 928 const unsigned char *src;
eb1d1641
HX		 929 struct igmpv3_report *ih;
930 struct igmpv3_grec *grec;
931 int i;
932 int len;
933 int num;
934 int type;
935 int err = 0;
936 __be32 group;
937
eb1d1641
HX		 938 ih = igmpv3_report_hdr(skb);
939 num = ntohs(ih->ngrec);
c2d4fbd2 940 len = skb_transport_offset(skb) + sizeof(*ih);
eb1d1641
HX		 941
942 for (i = 0; i < num; i++) {
943 len += sizeof(*grec);
ba5ea614 944 if (!ip_mc_may_pull(skb, len))
eb1d1641
HX		 945 return -EINVAL;
946
fd218cf9 947 grec = (void *)(skb->data + len - sizeof(*grec));
eb1d1641
HX		 948 group = grec->grec_mca;
949 type = grec->grec_type;
950
8eabf95c 951 len += ntohs(grec->grec_nsrcs) * 4;
ba5ea614 952 if (!ip_mc_may_pull(skb, len))
eb1d1641
HX		 953 return -EINVAL;
954
955 /* We treat this as an IGMPv2 report for now. */
956 switch (type) {
957 case IGMPV3_MODE_IS_INCLUDE:
958 case IGMPV3_MODE_IS_EXCLUDE:
959 case IGMPV3_CHANGE_TO_INCLUDE:
960 case IGMPV3_CHANGE_TO_EXCLUDE:
961 case IGMPV3_ALLOW_NEW_SOURCES:
962 case IGMPV3_BLOCK_OLD_SOURCES:
963 break;
964
965 default:
966 continue;
967 }
968
6db6f0ea 969 src = eth_hdr(skb)->h_source;
bc8c20ac
SA		 970 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
971 type == IGMPV3_MODE_IS_INCLUDE) &&
972 ntohs(grec->grec_nsrcs) == 0) {
6db6f0ea 973 br_ip4_multicast_leave_group(br, port, group, vid, src);
bc8c20ac 974 } else {
6db6f0ea
FF		 975 err = br_ip4_multicast_add_group(br, port, group, vid,
976 src);
bc8c20ac
SA		 977 if (err)
978 break;
979 }
eb1d1641
HX		 980 }
981
982 return err;
983}
984
dfd56b8b 985#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 986static int br_ip6_multicast_mld2_report(struct net_bridge *br,
987 struct net_bridge_port *port,
06499098
VY		 988 struct sk_buff *skb,
989 u16 vid)
08b202b6 990{
ba5ea614 991 unsigned int nsrcs_offset;
6db6f0ea 992 const unsigned char *src;
08b202b6
YH		 993 struct icmp6hdr *icmp6h;
994 struct mld2_grec *grec;
ba5ea614 995 unsigned int grec_len;
08b202b6
YH		 996 int i;
997 int len;
998 int num;
999 int err = 0;
1000
ba5ea614 1001 if (!ipv6_mc_may_pull(skb, sizeof(*icmp6h)))
08b202b6
YH		 1002 return -EINVAL;
1003
1004 icmp6h = icmp6_hdr(skb);
1005 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
c2d4fbd2 1006 len = skb_transport_offset(skb) + sizeof(*icmp6h);
08b202b6
YH		 1007
1008 for (i = 0; i < num; i++) {
1009 __be16 *nsrcs, _nsrcs;
1010
ba5ea614
LL		 1011 nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs);
1012
1013 if (skb_transport_offset(skb) + ipv6_transport_len(skb) <
1014 nsrcs_offset + sizeof(_nsrcs))
1015 return -EINVAL;
1016
1017 nsrcs = skb_header_pointer(skb, nsrcs_offset,
08b202b6
YH		 1018 sizeof(_nsrcs), &_nsrcs);
1019 if (!nsrcs)
1020 return -EINVAL;
1021
4154b567 1022 grec_len = struct_size(grec, grec_src, ntohs(*nsrcs));
ba5ea614
LL		 1023
1024 if (!ipv6_mc_may_pull(skb, len + grec_len))
08b202b6
YH		 1025 return -EINVAL;
1026
1027 grec = (struct mld2_grec *)(skb->data + len);
ba5ea614 1028 len += grec_len;
08b202b6
YH		 1029
1030 /* We treat these as MLDv1 reports for now. */
1031 switch (grec->grec_type) {
1032 case MLD2_MODE_IS_INCLUDE:
1033 case MLD2_MODE_IS_EXCLUDE:
1034 case MLD2_CHANGE_TO_INCLUDE:
1035 case MLD2_CHANGE_TO_EXCLUDE:
1036 case MLD2_ALLOW_NEW_SOURCES:
1037 case MLD2_BLOCK_OLD_SOURCES:
1038 break;
1039
1040 default:
1041 continue;
1042 }
1043
6db6f0ea 1044 src = eth_hdr(skb)->h_source;
bc8c20ac
SA		 1045 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1046 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1047 ntohs(*nsrcs) == 0) {
1048 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
6db6f0ea 1049 vid, src);
bc8c20ac
SA		 1050 } else {
1051 err = br_ip6_multicast_add_group(br, port,
6db6f0ea
FF		 1052 &grec->grec_mca, vid,
1053 src);
9264251e 1054 if (err)
bc8c20ac
SA		 1055 break;
1056 }
08b202b6
YH		 1057 }
1058
1059 return err;
1060}
1061#endif
1062
dc4eb53a 1063static bool br_ip4_multicast_select_querier(struct net_bridge *br,
2cd41431 1064 struct net_bridge_port *port,
dc4eb53a
LL		 1065 __be32 saddr)
1066{
1067 if (!timer_pending(&br->ip4_own_query.timer) &&
1068 !timer_pending(&br->ip4_other_query.timer))
1069 goto update;
1070
1071 if (!br->ip4_querier.addr.u.ip4)
1072 goto update;
1073
1074 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1075 goto update;
1076
1077 return false;
1078
1079update:
1080 br->ip4_querier.addr.u.ip4 = saddr;
1081
2cd41431
LL		 1082 /* update protected by general multicast_lock by caller */
1083 rcu_assign_pointer(br->ip4_querier.port, port);
1084
dc4eb53a
LL		 1085 return true;
1086}
1087
1088#if IS_ENABLED(CONFIG_IPV6)
1089static bool br_ip6_multicast_select_querier(struct net_bridge *br,
2cd41431 1090 struct net_bridge_port *port,
dc4eb53a
LL		 1091 struct in6_addr *saddr)
1092{
1093 if (!timer_pending(&br->ip6_own_query.timer) &&
1094 !timer_pending(&br->ip6_other_query.timer))
1095 goto update;
1096
1097 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1098 goto update;
1099
1100 return false;
1101
1102update:
1103 br->ip6_querier.addr.u.ip6 = *saddr;
1104
2cd41431
LL		 1105 /* update protected by general multicast_lock by caller */
1106 rcu_assign_pointer(br->ip6_querier.port, port);
1107
dc4eb53a
LL		 1108 return true;
1109}
1110#endif
1111
1112static bool br_multicast_select_querier(struct net_bridge *br,
2cd41431 1113 struct net_bridge_port *port,
dc4eb53a
LL		 1114 struct br_ip *saddr)
1115{
1116 switch (saddr->proto) {
1117 case htons(ETH_P_IP):
2cd41431 1118 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
dc4eb53a
LL		 1119#if IS_ENABLED(CONFIG_IPV6)
1120 case htons(ETH_P_IPV6):
2cd41431 1121 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
dc4eb53a
LL		 1122#endif
1123 }
1124
1125 return false;
1126}
1127
cc0fdd80 1128static void
90010b36
LL		 1129br_multicast_update_query_timer(struct net_bridge *br,
1130 struct bridge_mcast_other_query *query,
1131 unsigned long max_delay)
b00589af 1132{
90010b36
LL		 1133 if (!timer_pending(&query->timer))
1134 query->delay_time = jiffies + max_delay;
b00589af 1135
90010b36 1136 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
b00589af
LL		 1137}
1138
6d549648
NF		 1139static void br_port_mc_router_state_change(struct net_bridge_port *p,
1140 bool is_mc_router)
1141{
1142 struct switchdev_attr attr = {
1143 .orig_dev = p->dev,
1144 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
1145 .flags = SWITCHDEV_F_DEFER,
1146 .u.mrouter = is_mc_router,
1147 };
1148
1149 switchdev_port_attr_set(p->dev, &attr);
1150}
1151
7e80c124 1152/*
7c77602f 1153 * Add port to router_list
7e80c124 1154 * list is maintained ordered by pointer value
1155 * and locked by br->multicast_lock and RCU
1156 */
0909e117
HX		 1157static void br_multicast_add_router(struct net_bridge *br,
1158 struct net_bridge_port *port)
1159{
dcdca2c4 1160 struct net_bridge_port *p;
b67bfe0d 1161 struct hlist_node *slot = NULL;
dcdca2c4 1162
1a040eac
NA		 1163 if (!hlist_unhashed(&port->rlist))
1164 return;
1165
b67bfe0d 1166 hlist_for_each_entry(p, &br->router_list, rlist) {
7e80c124 1167 if ((unsigned long) port >= (unsigned long) p)
1168 break;
b67bfe0d 1169 slot = &p->rlist;
dcdca2c4 1170 }
1171
7e80c124 1172 if (slot)
1d023284 1173 hlist_add_behind_rcu(&port->rlist, slot);
dcdca2c4 1174 else
1175 hlist_add_head_rcu(&port->rlist, &br->router_list);
949f1e39 1176 br_rtr_notify(br->dev, port, RTM_NEWMDB);
6d549648 1177 br_port_mc_router_state_change(port, true);
0909e117
HX		 1178}
1179
eb1d1641
HX		 1180static void br_multicast_mark_router(struct net_bridge *br,
1181 struct net_bridge_port *port)
1182{
1183 unsigned long now = jiffies;
eb1d1641
HX		 1184
1185 if (!port) {
77041420
YG		 1186 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
1187 if (!timer_pending(&br->multicast_router_timer))
1188 br_mc_router_state_change(br, true);
eb1d1641
HX		 1189 mod_timer(&br->multicast_router_timer,
1190 now + br->multicast_querier_interval);
77041420 1191 }
eb1d1641
HX		 1192 return;
1193 }
1194
a55d8246
NA		 1195 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1196 port->multicast_router == MDB_RTR_TYPE_PERM)
eb1d1641
HX		 1197 return;
1198
0909e117 1199 br_multicast_add_router(br, port);
eb1d1641 1200
eb1d1641
HX		 1201 mod_timer(&port->multicast_router_timer,
1202 now + br->multicast_querier_interval);
1203}
1204
1205static void br_multicast_query_received(struct net_bridge *br,
1206 struct net_bridge_port *port,
90010b36 1207 struct bridge_mcast_other_query *query,
dc4eb53a 1208 struct br_ip *saddr,
b00589af 1209 unsigned long max_delay)
eb1d1641 1210{
2cd41431 1211 if (!br_multicast_select_querier(br, port, saddr))
eb1d1641
HX		 1212 return;
1213
dc4eb53a 1214 br_multicast_update_query_timer(br, query, max_delay);
278e2148 1215 br_multicast_mark_router(br, port);
eb1d1641
HX		 1216}
1217
9c2e955c 1218static void br_ip4_multicast_query(struct net_bridge *br,
1219 struct net_bridge_port *port,
1220 struct sk_buff *skb,
1221 u16 vid)
eb1d1641 1222{
ba5ea614 1223 unsigned int transport_len = ip_transport_len(skb);
b71d1d42 1224 const struct iphdr *iph = ip_hdr(skb);
eb1d1641
HX		 1225 struct igmphdr *ih = igmp_hdr(skb);
1226 struct net_bridge_mdb_entry *mp;
1227 struct igmpv3_query *ih3;
1228 struct net_bridge_port_group *p;
e8051688 1229 struct net_bridge_port_group __rcu **pp;
dc4eb53a 1230 struct br_ip saddr;
eb1d1641
HX		 1231 unsigned long max_delay;
1232 unsigned long now = jiffies;
1233 __be32 group;
1234
1235 spin_lock(&br->multicast_lock);
1236 if (!netif_running(br->dev) ||
1237 (port && port->state == BR_STATE_DISABLED))
1238 goto out;
1239
eb1d1641
HX		 1240 group = ih->group;
1241
ba5ea614 1242 if (transport_len == sizeof(*ih)) {
eb1d1641
HX		 1243 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1244
1245 if (!max_delay) {
1246 max_delay = 10 * HZ;
1247 group = 0;
1248 }
ba5ea614 1249 } else if (transport_len >= sizeof(*ih3)) {
eb1d1641
HX		 1250 ih3 = igmpv3_query_hdr(skb);
1251 if (ih3->nsrcs)
bec68ff1 1252 goto out;
eb1d1641 1253
0ba8c9ec
YH		 1254 max_delay = ih3->code ?
1255 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
9afd85c9 1256 } else {
9ed973cc
LL		 1257 goto out;
1258 }
1259
dc4eb53a
LL		 1260 if (!group) {
1261 saddr.proto = htons(ETH_P_IP);
1262 saddr.u.ip4 = iph->saddr;
b00589af 1263
dc4eb53a
LL		 1264 br_multicast_query_received(br, port, &br->ip4_other_query,
1265 &saddr, max_delay);
eb1d1641 1266 goto out;
dc4eb53a 1267 }
eb1d1641 1268
19e3a9c9 1269 mp = br_mdb_ip4_get(br, group, vid);
eb1d1641
HX		 1270 if (!mp)
1271 goto out;
1272
1273 max_delay *= br->multicast_last_member_count;
1274
ff0fd34e 1275 if (mp->host_joined &&
eb1d1641
HX		 1276 (timer_pending(&mp->timer) ?
1277 time_after(mp->timer.expires, now + max_delay) :
1278 try_to_del_timer_sync(&mp->timer) >= 0))
1279 mod_timer(&mp->timer, now + max_delay);
1280
e8051688
ED		 1281 for (pp = &mp->ports;
1282 (p = mlock_dereference(*pp, br)) != NULL;
1283 pp = &p->next) {
eb1d1641
HX		 1284 if (timer_pending(&p->timer) ?
1285 time_after(p->timer.expires, now + max_delay) :
1286 try_to_del_timer_sync(&p->timer) >= 0)
24f9cdcb 1287 mod_timer(&p->timer, now + max_delay);
eb1d1641
HX		 1288 }
1289
1290out:
1291 spin_unlock(&br->multicast_lock);
eb1d1641
HX		 1292}
1293
dfd56b8b 1294#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1295static int br_ip6_multicast_query(struct net_bridge *br,
1296 struct net_bridge_port *port,
06499098
VY		 1297 struct sk_buff *skb,
1298 u16 vid)
08b202b6 1299{
ba5ea614 1300 unsigned int transport_len = ipv6_transport_len(skb);
b71d1d42 1301 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
eca2a43b 1302 struct mld_msg *mld;
08b202b6
YH		 1303 struct net_bridge_mdb_entry *mp;
1304 struct mld2_query *mld2q;
e8051688
ED		 1305 struct net_bridge_port_group *p;
1306 struct net_bridge_port_group __rcu **pp;
dc4eb53a 1307 struct br_ip saddr;
08b202b6
YH		 1308 unsigned long max_delay;
1309 unsigned long now = jiffies;
856ce5d0 1310 unsigned int offset = skb_transport_offset(skb);
b71d1d42 1311 const struct in6_addr *group = NULL;
9ed973cc 1312 bool is_general_query;
08b202b6
YH		 1313 int err = 0;
1314
1315 spin_lock(&br->multicast_lock);
1316 if (!netif_running(br->dev) ||
1317 (port && port->state == BR_STATE_DISABLED))
1318 goto out;
1319
ba5ea614 1320 if (transport_len == sizeof(*mld)) {
856ce5d0 1321 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
08b202b6
YH		 1322 err = -EINVAL;
1323 goto out;
1324 }
1325 mld = (struct mld_msg *) icmp6_hdr(skb);
4715213d 1326 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
08b202b6
YH		 1327 if (max_delay)
1328 group = &mld->mld_mca;
248ba8ec 1329 } else {
856ce5d0 1330 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
08b202b6
YH		 1331 err = -EINVAL;
1332 goto out;
1333 }
1334 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1335 if (!mld2q->mld2q_nsrcs)
1336 group = &mld2q->mld2q_mca;
e3f5b170
DB		 1337
1338 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
08b202b6
YH		 1339 }
1340
9ed973cc
LL		 1341 is_general_query = group && ipv6_addr_any(group);
1342
dc4eb53a
LL		 1343 if (is_general_query) {
1344 saddr.proto = htons(ETH_P_IPV6);
1345 saddr.u.ip6 = ip6h->saddr;
b00589af 1346
dc4eb53a
LL		 1347 br_multicast_query_received(br, port, &br->ip6_other_query,
1348 &saddr, max_delay);
08b202b6 1349 goto out;
6c03ee8b
LL		 1350 } else if (!group) {
1351 goto out;
dc4eb53a 1352 }
08b202b6 1353
19e3a9c9 1354 mp = br_mdb_ip6_get(br, group, vid);
08b202b6
YH		 1355 if (!mp)
1356 goto out;
1357
1358 max_delay *= br->multicast_last_member_count;
ff0fd34e 1359 if (mp->host_joined &&
08b202b6
YH		 1360 (timer_pending(&mp->timer) ?
1361 time_after(mp->timer.expires, now + max_delay) :
1362 try_to_del_timer_sync(&mp->timer) >= 0))
1363 mod_timer(&mp->timer, now + max_delay);
1364
e8051688
ED		 1365 for (pp = &mp->ports;
1366 (p = mlock_dereference(*pp, br)) != NULL;
1367 pp = &p->next) {
08b202b6
YH		 1368 if (timer_pending(&p->timer) ?
1369 time_after(p->timer.expires, now + max_delay) :
1370 try_to_del_timer_sync(&p->timer) >= 0)
24f9cdcb 1371 mod_timer(&p->timer, now + max_delay);
08b202b6
YH		 1372 }
1373
1374out:
1375 spin_unlock(&br->multicast_lock);
1376 return err;
1377}
1378#endif
1379
90010b36
LL		 1380static void
1381br_multicast_leave_group(struct net_bridge *br,
1382 struct net_bridge_port *port,
1383 struct br_ip *group,
1384 struct bridge_mcast_other_query *other_query,
6db6f0ea
FF		 1385 struct bridge_mcast_own_query *own_query,
1386 const unsigned char *src)
eb1d1641 1387{
eb1d1641
HX		 1388 struct net_bridge_mdb_entry *mp;
1389 struct net_bridge_port_group *p;
1390 unsigned long now;
1391 unsigned long time;
1392
eb1d1641
HX		 1393 spin_lock(&br->multicast_lock);
1394 if (!netif_running(br->dev) ||
544586f7 1395 (port && port->state == BR_STATE_DISABLED))
eb1d1641
HX		 1396 goto out;
1397
19e3a9c9 1398 mp = br_mdb_ip_get(br, group);
eb1d1641
HX		 1399 if (!mp)
1400 goto out;
1401
544586f7
SA		 1402 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1403 struct net_bridge_port_group __rcu **pp;
1404
1405 for (pp = &mp->ports;
1406 (p = mlock_dereference(*pp, br)) != NULL;
1407 pp = &p->next) {
6db6f0ea 1408 if (!br_port_group_equal(p, port, src))
544586f7
SA		 1409 continue;
1410
1411 rcu_assign_pointer(*pp, p->next);
1412 hlist_del_init(&p->mglist);
1413 del_timer(&p->timer);
4329596c 1414 kfree_rcu(p, rcu);
45ebcce5
ER		 1415 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1416 p->flags);
544586f7 1417
ff0fd34e 1418 if (!mp->ports && !mp->host_joined &&
544586f7
SA		 1419 netif_running(br->dev))
1420 mod_timer(&mp->timer, jiffies);
1421 }
1422 goto out;
1423 }
1424
1425 if (timer_pending(&other_query->timer))
1426 goto out;
1427
675779ad 1428 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
6b7df111
CW		 1429 __br_multicast_send_query(br, port, &mp->addr);
1430
1431 time = jiffies + br->multicast_last_member_count *
1432 br->multicast_last_member_interval;
cc0fdd80 1433
90010b36 1434 mod_timer(&own_query->timer, time);
6b7df111
CW		 1435
1436 for (p = mlock_dereference(mp->ports, br);
1437 p != NULL;
1438 p = mlock_dereference(p->next, br)) {
6db6f0ea 1439 if (!br_port_group_equal(p, port, src))
6b7df111
CW		 1440 continue;
1441
1442 if (!hlist_unhashed(&p->mglist) &&
1443 (timer_pending(&p->timer) ?
1444 time_after(p->timer.expires, time) :
1445 try_to_del_timer_sync(&p->timer) >= 0)) {
1446 mod_timer(&p->timer, time);
1447 }
1448
1449 break;
1450 }
1451 }
1452
eb1d1641
HX		 1453 now = jiffies;
1454 time = now + br->multicast_last_member_count *
1455 br->multicast_last_member_interval;
1456
1457 if (!port) {
ff0fd34e 1458 if (mp->host_joined &&
eb1d1641
HX		 1459 (timer_pending(&mp->timer) ?
1460 time_after(mp->timer.expires, time) :
1461 try_to_del_timer_sync(&mp->timer) >= 0)) {
1462 mod_timer(&mp->timer, time);
eb1d1641 1463 }
454594f3
LL		 1464
1465 goto out;
1466 }
1467
1468 for (p = mlock_dereference(mp->ports, br);
1469 p != NULL;
1470 p = mlock_dereference(p->next, br)) {
1471 if (p->port != port)
1472 continue;
1473
1474 if (!hlist_unhashed(&p->mglist) &&
1475 (timer_pending(&p->timer) ?
1476 time_after(p->timer.expires, time) :
1477 try_to_del_timer_sync(&p->timer) >= 0)) {
1478 mod_timer(&p->timer, time);
1479 }
1480
1481 break;
eb1d1641 1482 }
eb1d1641
HX		 1483out:
1484 spin_unlock(&br->multicast_lock);
1485}
1486
8ef2a9a5
YH		 1487static void br_ip4_multicast_leave_group(struct net_bridge *br,
1488 struct net_bridge_port *port,
b0e9a30d 1489 __be32 group,
6db6f0ea
FF		 1490 __u16 vid,
1491 const unsigned char *src)
8ef2a9a5
YH		 1492{
1493 struct br_ip br_group;
90010b36 1494 struct bridge_mcast_own_query *own_query;
8ef2a9a5
YH		 1495
1496 if (ipv4_is_local_multicast(group))
1497 return;
1498
90010b36
LL		 1499 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1500
1515a63f 1501 memset(&br_group, 0, sizeof(br_group));
8ef2a9a5
YH		 1502 br_group.u.ip4 = group;
1503 br_group.proto = htons(ETH_P_IP);
b0e9a30d 1504 br_group.vid = vid;
8ef2a9a5 1505
90010b36 1506 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
6db6f0ea 1507 own_query, src);
8ef2a9a5
YH		 1508}
1509
dfd56b8b 1510#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1511static void br_ip6_multicast_leave_group(struct net_bridge *br,
1512 struct net_bridge_port *port,
b0e9a30d 1513 const struct in6_addr *group,
6db6f0ea
FF		 1514 __u16 vid,
1515 const unsigned char *src)
08b202b6
YH		 1516{
1517 struct br_ip br_group;
90010b36 1518 struct bridge_mcast_own_query *own_query;
08b202b6 1519
3c3769e6 1520 if (ipv6_addr_is_ll_all_nodes(group))
08b202b6
YH		 1521 return;
1522
90010b36
LL		 1523 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1524
1515a63f 1525 memset(&br_group, 0, sizeof(br_group));
4e3fd7a0 1526 br_group.u.ip6 = *group;
08b202b6 1527 br_group.proto = htons(ETH_P_IPV6);
b0e9a30d 1528 br_group.vid = vid;
08b202b6 1529
90010b36 1530 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
6db6f0ea 1531 own_query, src);
08b202b6
YH		 1532}
1533#endif
8ef2a9a5 1534
1080ab95
NA		 1535static void br_multicast_err_count(const struct net_bridge *br,
1536 const struct net_bridge_port *p,
1537 __be16 proto)
1538{
1539 struct bridge_mcast_stats __percpu *stats;
1540 struct bridge_mcast_stats *pstats;
1541
675779ad 1542 if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
1080ab95
NA		 1543 return;
1544
1545 if (p)
1546 stats = p->mcast_stats;
1547 else
1548 stats = br->mcast_stats;
1549 if (WARN_ON(!stats))
1550 return;
1551
1552 pstats = this_cpu_ptr(stats);
1553
1554 u64_stats_update_begin(&pstats->syncp);
1555 switch (proto) {
1556 case htons(ETH_P_IP):
1557 pstats->mstats.igmp_parse_errors++;
1558 break;
1559#if IS_ENABLED(CONFIG_IPV6)
1560 case htons(ETH_P_IPV6):
1561 pstats->mstats.mld_parse_errors++;
1562 break;
1563#endif
1564 }
1565 u64_stats_update_end(&pstats->syncp);
1566}
1567
91b02d3d
NA		 1568static void br_multicast_pim(struct net_bridge *br,
1569 struct net_bridge_port *port,
1570 const struct sk_buff *skb)
1571{
1572 unsigned int offset = skb_transport_offset(skb);
1573 struct pimhdr *pimhdr, _pimhdr;
1574
1575 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1576 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1577 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1578 return;
1579
1580 br_multicast_mark_router(br, port);
1581}
1582
4b3087c7
LL		 1583static int br_ip4_multicast_mrd_rcv(struct net_bridge *br,
1584 struct net_bridge_port *port,
1585 struct sk_buff *skb)
1586{
1587 if (ip_hdr(skb)->protocol != IPPROTO_IGMP ||
1588 igmp_hdr(skb)->type != IGMP_MRDISC_ADV)
1589 return -ENOMSG;
1590
1591 br_multicast_mark_router(br, port);
1592
1593 return 0;
1594}
1595
eb1d1641
HX		 1596static int br_multicast_ipv4_rcv(struct net_bridge *br,
1597 struct net_bridge_port *port,
06499098
VY		 1598 struct sk_buff *skb,
1599 u16 vid)
eb1d1641 1600{
6db6f0ea 1601 const unsigned char *src;
eb1d1641 1602 struct igmphdr *ih;
eb1d1641
HX		 1603 int err;
1604
ba5ea614 1605 err = ip_mc_check_igmp(skb);
eb1d1641 1606
9afd85c9 1607 if (err == -ENOMSG) {
91b02d3d 1608 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
bd4265fe 1609 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
91b02d3d
NA		 1610 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1611 if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1612 br_multicast_pim(br, port, skb);
4b3087c7 1613 } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) {
08e71623 1614 br_ip4_multicast_mrd_rcv(br, port, skb);
91b02d3d 1615 }
4b3087c7 1616
eb1d1641 1617 return 0;
9afd85c9 1618 } else if (err < 0) {
1080ab95 1619 br_multicast_err_count(br, port, skb->protocol);
9afd85c9 1620 return err;
bd4265fe 1621 }
eb1d1641 1622
9afd85c9 1623 ih = igmp_hdr(skb);
6db6f0ea 1624 src = eth_hdr(skb)->h_source;
1080ab95 1625 BR_INPUT_SKB_CB(skb)->igmp = ih->type;
eb1d1641
HX		 1626
1627 switch (ih->type) {
1628 case IGMP_HOST_MEMBERSHIP_REPORT:
1629 case IGMPV2_HOST_MEMBERSHIP_REPORT:
62b2bcb4 1630 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
6db6f0ea 1631 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
eb1d1641
HX		 1632 break;
1633 case IGMPV3_HOST_MEMBERSHIP_REPORT:
ba5ea614 1634 err = br_ip4_multicast_igmp3_report(br, port, skb, vid);
eb1d1641
HX		 1635 break;
1636 case IGMP_HOST_MEMBERSHIP_QUERY:
ba5ea614 1637 br_ip4_multicast_query(br, port, skb, vid);
eb1d1641
HX		 1638 break;
1639 case IGMP_HOST_LEAVE_MESSAGE:
6db6f0ea 1640 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
eb1d1641
HX		 1641 break;
1642 }
1643
a65056ec 1644 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1080ab95
NA		 1645 BR_MCAST_DIR_RX);
1646
eb1d1641
HX		 1647 return err;
1648}
1649
dfd56b8b 1650#if IS_ENABLED(CONFIG_IPV6)
4b3087c7
LL		 1651static int br_ip6_multicast_mrd_rcv(struct net_bridge *br,
1652 struct net_bridge_port *port,
1653 struct sk_buff *skb)
1654{
1655 int ret;
1656
1657 if (ipv6_hdr(skb)->nexthdr != IPPROTO_ICMPV6)
1658 return -ENOMSG;
1659
1660 ret = ipv6_mc_check_icmpv6(skb);
1661 if (ret < 0)
1662 return ret;
1663
1664 if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV)
1665 return -ENOMSG;
1666
1667 br_multicast_mark_router(br, port);
1668
1669 return 0;
1670}
1671
08b202b6
YH		 1672static int br_multicast_ipv6_rcv(struct net_bridge *br,
1673 struct net_bridge_port *port,
06499098
VY		 1674 struct sk_buff *skb,
1675 u16 vid)
08b202b6 1676{
6db6f0ea 1677 const unsigned char *src;
9afd85c9 1678 struct mld_msg *mld;
08b202b6
YH		 1679 int err;
1680
ba5ea614 1681 err = ipv6_mc_check_mld(skb);
08b202b6 1682
9afd85c9
LL		 1683 if (err == -ENOMSG) {
1684 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1685 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
4b3087c7
LL		 1686
1687 if (ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr)) {
1688 err = br_ip6_multicast_mrd_rcv(br, port, skb);
1689
1690 if (err < 0 && err != -ENOMSG) {
1691 br_multicast_err_count(br, port, skb->protocol);
1692 return err;
1693 }
1694 }
1695
08b202b6 1696 return 0;
9afd85c9 1697 } else if (err < 0) {
1080ab95 1698 br_multicast_err_count(br, port, skb->protocol);
9afd85c9 1699 return err;
08b202b6
YH		 1700 }
1701
9afd85c9 1702 mld = (struct mld_msg *)skb_transport_header(skb);
1080ab95 1703 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
08b202b6 1704
9afd85c9 1705 switch (mld->mld_type) {
08b202b6 1706 case ICMPV6_MGM_REPORT:
6db6f0ea 1707 src = eth_hdr(skb)->h_source;
fc2af6c7 1708 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
6db6f0ea
FF		 1709 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
1710 src);
08b202b6 1711 break;
08b202b6 1712 case ICMPV6_MLD2_REPORT:
ba5ea614 1713 err = br_ip6_multicast_mld2_report(br, port, skb, vid);
08b202b6
YH		 1714 break;
1715 case ICMPV6_MGM_QUERY:
ba5ea614 1716 err = br_ip6_multicast_query(br, port, skb, vid);
08b202b6
YH		 1717 break;
1718 case ICMPV6_MGM_REDUCTION:
6db6f0ea
FF		 1719 src = eth_hdr(skb)->h_source;
1720 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
9afd85c9 1721 break;
08b202b6
YH		 1722 }
1723
a65056ec 1724 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1080ab95
NA		 1725 BR_MCAST_DIR_RX);
1726
08b202b6
YH		 1727 return err;
1728}
1729#endif
1730
eb1d1641 1731int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
06499098 1732 struct sk_buff *skb, u16 vid)
eb1d1641 1733{
1080ab95
NA		 1734 int ret = 0;
1735
1fafc7a9
YH		 1736 BR_INPUT_SKB_CB(skb)->igmp = 0;
1737 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1738
13cefad2 1739 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
eb1d1641
HX		 1740 return 0;
1741
1742 switch (skb->protocol) {
1743 case htons(ETH_P_IP):
1080ab95
NA		 1744 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1745 break;
dfd56b8b 1746#if IS_ENABLED(CONFIG_IPV6)
08b202b6 1747 case htons(ETH_P_IPV6):
1080ab95
NA		 1748 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1749 break;
08b202b6 1750#endif
eb1d1641
HX		 1751 }
1752
1080ab95 1753 return ret;
eb1d1641
HX		 1754}
1755
cc0fdd80 1756static void br_multicast_query_expired(struct net_bridge *br,
2cd41431
LL		 1757 struct bridge_mcast_own_query *query,
1758 struct bridge_mcast_querier *querier)
cc0fdd80
LL		 1759{
1760 spin_lock(&br->multicast_lock);
1761 if (query->startup_sent < br->multicast_startup_query_count)
1762 query->startup_sent++;
1763
71d9f614 1764 RCU_INIT_POINTER(querier->port, NULL);
cc0fdd80
LL		 1765 br_multicast_send_query(br, NULL, query);
1766 spin_unlock(&br->multicast_lock);
1767}
1768
88c1f37f 1769static void br_ip4_multicast_query_expired(struct timer_list *t)
eb1d1641 1770{
88c1f37f 1771 struct net_bridge *br = from_timer(br, t, ip4_own_query.timer);
eb1d1641 1772
2cd41431 1773 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
cc0fdd80 1774}
eb1d1641 1775
cc0fdd80 1776#if IS_ENABLED(CONFIG_IPV6)
88c1f37f 1777static void br_ip6_multicast_query_expired(struct timer_list *t)
cc0fdd80 1778{
88c1f37f 1779 struct net_bridge *br = from_timer(br, t, ip6_own_query.timer);
eb1d1641 1780
2cd41431 1781 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
eb1d1641 1782}
cc0fdd80 1783#endif
eb1d1641
HX		 1784
1785void br_multicast_init(struct net_bridge *br)
1786{
d08c6bc0 1787 br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX;
eb1d1641 1788
7f0aec7a 1789 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
eb1d1641
HX		 1790 br->multicast_last_member_count = 2;
1791 br->multicast_startup_query_count = 2;
1792
1793 br->multicast_last_member_interval = HZ;
1794 br->multicast_query_response_interval = 10 * HZ;
1795 br->multicast_startup_query_interval = 125 * HZ / 4;
1796 br->multicast_query_interval = 125 * HZ;
1797 br->multicast_querier_interval = 255 * HZ;
1798 br->multicast_membership_interval = 260 * HZ;
1799
90010b36 1800 br->ip4_other_query.delay_time = 0;
2cd41431 1801 br->ip4_querier.port = NULL;
aa2ae3e7 1802 br->multicast_igmp_version = 2;
cc0fdd80 1803#if IS_ENABLED(CONFIG_IPV6)
aa2ae3e7 1804 br->multicast_mld_version = 1;
90010b36 1805 br->ip6_other_query.delay_time = 0;
2cd41431 1806 br->ip6_querier.port = NULL;
cc0fdd80 1807#endif
6919622a 1808 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true);
675779ad 1809 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
b00589af 1810
eb1d1641 1811 spin_lock_init(&br->multicast_lock);
88c1f37f
AP		 1812 timer_setup(&br->multicast_router_timer,
1813 br_multicast_local_router_expired, 0);
1814 timer_setup(&br->ip4_other_query.timer,
1815 br_ip4_multicast_querier_expired, 0);
1816 timer_setup(&br->ip4_own_query.timer,
1817 br_ip4_multicast_query_expired, 0);
cc0fdd80 1818#if IS_ENABLED(CONFIG_IPV6)
88c1f37f
AP		 1819 timer_setup(&br->ip6_other_query.timer,
1820 br_ip6_multicast_querier_expired, 0);
1821 timer_setup(&br->ip6_own_query.timer,
1822 br_ip6_multicast_query_expired, 0);
cc0fdd80 1823#endif
19e3a9c9 1824 INIT_HLIST_HEAD(&br->mdb_list);
eb1d1641
HX		 1825}
1826
4effd28c
LL		 1827static void br_ip4_multicast_join_snoopers(struct net_bridge *br)
1828{
1829 struct in_device *in_dev = in_dev_get(br->dev);
1830
1831 if (!in_dev)
1832 return;
1833
9fb20801 1834 __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
4effd28c
LL		 1835 in_dev_put(in_dev);
1836}
1837
1838#if IS_ENABLED(CONFIG_IPV6)
1839static void br_ip6_multicast_join_snoopers(struct net_bridge *br)
1840{
1841 struct in6_addr addr;
1842
1843 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
1844 ipv6_dev_mc_inc(br->dev, &addr);
1845}
1846#else
1847static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br)
1848{
1849}
1850#endif
1851
1852static void br_multicast_join_snoopers(struct net_bridge *br)
1853{
1854 br_ip4_multicast_join_snoopers(br);
1855 br_ip6_multicast_join_snoopers(br);
1856}
1857
1858static void br_ip4_multicast_leave_snoopers(struct net_bridge *br)
1859{
1860 struct in_device *in_dev = in_dev_get(br->dev);
1861
1862 if (WARN_ON(!in_dev))
1863 return;
1864
9fb20801 1865 __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
4effd28c
LL		 1866 in_dev_put(in_dev);
1867}
1868
1869#if IS_ENABLED(CONFIG_IPV6)
1870static void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
1871{
1872 struct in6_addr addr;
1873
1874 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
1875 ipv6_dev_mc_dec(br->dev, &addr);
1876}
1877#else
1878static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
1879{
1880}
1881#endif
1882
1883static void br_multicast_leave_snoopers(struct net_bridge *br)
1884{
1885 br_ip4_multicast_leave_snoopers(br);
1886 br_ip6_multicast_leave_snoopers(br);
1887}
1888
cc0fdd80 1889static void __br_multicast_open(struct net_bridge *br,
90010b36 1890 struct bridge_mcast_own_query *query)
eb1d1641 1891{
cc0fdd80 1892 query->startup_sent = 0;
eb1d1641 1893
13cefad2 1894 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
eb1d1641
HX		 1895 return;
1896
cc0fdd80
LL		 1897 mod_timer(&query->timer, jiffies);
1898}
1899
1900void br_multicast_open(struct net_bridge *br)
1901{
4effd28c
LL		 1902 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
1903 br_multicast_join_snoopers(br);
1904
90010b36 1905 __br_multicast_open(br, &br->ip4_own_query);
cc0fdd80 1906#if IS_ENABLED(CONFIG_IPV6)
90010b36 1907 __br_multicast_open(br, &br->ip6_own_query);
cc0fdd80 1908#endif
eb1d1641
HX		 1909}
1910
1911void br_multicast_stop(struct net_bridge *br)
1912{
eb1d1641 1913 del_timer_sync(&br->multicast_router_timer);
90010b36
LL		 1914 del_timer_sync(&br->ip4_other_query.timer);
1915 del_timer_sync(&br->ip4_own_query.timer);
cc0fdd80 1916#if IS_ENABLED(CONFIG_IPV6)
90010b36
LL		 1917 del_timer_sync(&br->ip6_other_query.timer);
1918 del_timer_sync(&br->ip6_own_query.timer);
cc0fdd80 1919#endif
4effd28c
LL		 1920
1921 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
1922 br_multicast_leave_snoopers(br);
e10177ab
SA		 1923}
1924
1925void br_multicast_dev_del(struct net_bridge *br)
1926{
e10177ab 1927 struct net_bridge_mdb_entry *mp;
19e3a9c9 1928 struct hlist_node *tmp;
eb1d1641
HX		 1929
1930 spin_lock_bh(&br->multicast_lock);
19e3a9c9
NA		 1931 hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node) {
1932 del_timer(&mp->timer);
1933 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
1934 br_mdb_rht_params);
1935 hlist_del_rcu(&mp->mdb_node);
4329596c 1936 kfree_rcu(mp, rcu);
eb1d1641 1937 }
eb1d1641 1938 spin_unlock_bh(&br->multicast_lock);
19e3a9c9 1939
4329596c 1940 rcu_barrier();
eb1d1641 1941}
0909e117
HX		 1942
1943int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1944{
6ae4ae8e 1945 int err = -EINVAL;
0909e117
HX		 1946
1947 spin_lock_bh(&br->multicast_lock);
0909e117
HX		 1948
1949 switch (val) {
7f0aec7a
NA		 1950 case MDB_RTR_TYPE_DISABLED:
1951 case MDB_RTR_TYPE_PERM:
77041420 1952 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM);
0909e117 1953 del_timer(&br->multicast_router_timer);
77041420
YG		 1954 br->multicast_router = val;
1955 err = 0;
1956 break;
7f0aec7a 1957 case MDB_RTR_TYPE_TEMP_QUERY:
77041420
YG		 1958 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
1959 br_mc_router_state_change(br, false);
0909e117
HX		 1960 br->multicast_router = val;
1961 err = 0;
1962 break;
0909e117
HX		 1963 }
1964
0909e117
HX		 1965 spin_unlock_bh(&br->multicast_lock);
1966
1967 return err;
1968}
1969
7f0aec7a
NA		 1970static void __del_port_router(struct net_bridge_port *p)
1971{
1972 if (hlist_unhashed(&p->rlist))
1973 return;
1974 hlist_del_init_rcu(&p->rlist);
1975 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
6d549648 1976 br_port_mc_router_state_change(p, false);
f12e7d95
NF		 1977
1978 /* don't allow timer refresh */
1979 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1980 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
7f0aec7a
NA		 1981}
1982
0909e117
HX		 1983int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1984{
1985 struct net_bridge *br = p->br;
a55d8246 1986 unsigned long now = jiffies;
6ae4ae8e 1987 int err = -EINVAL;
0909e117
HX		 1988
1989 spin_lock(&br->multicast_lock);
4950cfd1 1990 if (p->multicast_router == val) {
a55d8246
NA		 1991 /* Refresh the temp router port timer */
1992 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1993 mod_timer(&p->multicast_router_timer,
1994 now + br->multicast_querier_interval);
4950cfd1
NA		 1995 err = 0;
1996 goto unlock;
1997 }
0909e117 1998 switch (val) {
7f0aec7a
NA		 1999 case MDB_RTR_TYPE_DISABLED:
2000 p->multicast_router = MDB_RTR_TYPE_DISABLED;
2001 __del_port_router(p);
2002 del_timer(&p->multicast_router_timer);
2003 break;
2004 case MDB_RTR_TYPE_TEMP_QUERY:
2005 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2006 __del_port_router(p);
2007 break;
2008 case MDB_RTR_TYPE_PERM:
2009 p->multicast_router = MDB_RTR_TYPE_PERM;
0909e117 2010 del_timer(&p->multicast_router_timer);
0909e117
HX		 2011 br_multicast_add_router(br, p);
2012 break;
a55d8246
NA		 2013 case MDB_RTR_TYPE_TEMP:
2014 p->multicast_router = MDB_RTR_TYPE_TEMP;
2015 br_multicast_mark_router(br, p);
2016 break;
7f0aec7a
NA		 2017 default:
2018 goto unlock;
0909e117 2019 }
7f0aec7a
NA		 2020 err = 0;
2021unlock:
0909e117
HX		 2022 spin_unlock(&br->multicast_lock);
2023
2024 return err;
2025}
561f1103 2026
cc0fdd80 2027static void br_multicast_start_querier(struct net_bridge *br,
90010b36 2028 struct bridge_mcast_own_query *query)
561f1103
HX		 2029{
2030 struct net_bridge_port *port;
74857216 2031
cc0fdd80 2032 __br_multicast_open(br, query);
74857216
HX		 2033
2034 list_for_each_entry(port, &br->port_list, list) {
2035 if (port->state == BR_STATE_DISABLED ||
2036 port->state == BR_STATE_BLOCKING)
2037 continue;
2038
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
HX		 2045 }
2046}
2047
2048int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2049{
7cb3f921 2050 struct net_bridge_port *port;
561f1103 2051
ef5e0d82 2052 spin_lock_bh(&br->multicast_lock);
13cefad2 2053 if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val)
561f1103
HX		 2054 goto unlock;
2055
13cefad2
NA		 2056 br_mc_disabled_update(br->dev, val);
2057 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val);
4effd28c
LL		 2058 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) {
2059 br_multicast_leave_snoopers(br);
561f1103 2060 goto unlock;
4effd28c 2061 }
561f1103 2062
3a7fda06
HX		 2063 if (!netif_running(br->dev))
2064 goto unlock;
2065
7cb3f921
NA		 2066 br_multicast_open(br);
2067 list_for_each_entry(port, &br->port_list, list)
2068 __br_multicast_enable_port(port);
561f1103
HX		 2069
2070unlock:
ef5e0d82 2071 spin_unlock_bh(&br->multicast_lock);
561f1103 2072
a26d94bf 2073 return 0;
561f1103 2074}
b195167f 2075
9341b988
IS		 2076bool br_multicast_enabled(const struct net_device *dev)
2077{
2078 struct net_bridge *br = netdev_priv(dev);
2079
13cefad2 2080 return !!br_opt_get(br, BROPT_MULTICAST_ENABLED);
9341b988
IS		 2081}
2082EXPORT_SYMBOL_GPL(br_multicast_enabled);
2083
0912bda4
YG		 2084bool br_multicast_router(const struct net_device *dev)
2085{
2086 struct net_bridge *br = netdev_priv(dev);
2087 bool is_router;
2088
2089 spin_lock_bh(&br->multicast_lock);
2090 is_router = br_multicast_is_router(br);
2091 spin_unlock_bh(&br->multicast_lock);
2092 return is_router;
2093}
2094EXPORT_SYMBOL_GPL(br_multicast_router);
2095
c5c23260
HX		 2096int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2097{
b00589af
LL		 2098 unsigned long max_delay;
2099
c5c23260
HX		 2100 val = !!val;
2101
2102 spin_lock_bh(&br->multicast_lock);
675779ad 2103 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val)
c5c23260
HX		 2104 goto unlock;
2105
675779ad 2106 br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val);
b00589af
LL		 2107 if (!val)
2108 goto unlock;
2109
2110 max_delay = br->multicast_query_response_interval;
b00589af 2111
90010b36
LL		 2112 if (!timer_pending(&br->ip4_other_query.timer))
2113 br->ip4_other_query.delay_time = jiffies + max_delay;
cc0fdd80 2114
90010b36 2115 br_multicast_start_querier(br, &br->ip4_own_query);
cc0fdd80
LL		 2116
2117#if IS_ENABLED(CONFIG_IPV6)
90010b36
LL		 2118 if (!timer_pending(&br->ip6_other_query.timer))
2119 br->ip6_other_query.delay_time = jiffies + max_delay;
cc0fdd80 2120
90010b36 2121 br_multicast_start_querier(br, &br->ip6_own_query);
cc0fdd80 2122#endif
c5c23260
HX		 2123
2124unlock:
2125 spin_unlock_bh(&br->multicast_lock);
2126
2127 return 0;
2128}
2129
5e923585
NA		 2130int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2131{
2132 /* Currently we support only version 2 and 3 */
2133 switch (val) {
2134 case 2:
2135 case 3:
2136 break;
2137 default:
2138 return -EINVAL;
2139 }
2140
2141 spin_lock_bh(&br->multicast_lock);
2142 br->multicast_igmp_version = val;
2143 spin_unlock_bh(&br->multicast_lock);
2144
2145 return 0;
2146}
2147
aa2ae3e7
NA		 2148#if IS_ENABLED(CONFIG_IPV6)
2149int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2150{
2151 /* Currently we support version 1 and 2 */
2152 switch (val) {
2153 case 1:
2154 case 2:
2155 break;
2156 default:
2157 return -EINVAL;
2158 }
2159
2160 spin_lock_bh(&br->multicast_lock);
2161 br->multicast_mld_version = val;
2162 spin_unlock_bh(&br->multicast_lock);
2163
2164 return 0;
2165}
2166#endif
2167
07f8ac4a
LL		 2168/**
2169 * br_multicast_list_adjacent - Returns snooped multicast addresses
2170 * @dev: The bridge port adjacent to which to retrieve addresses
2171 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2172 *
2173 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2174 * snooping feature on all bridge ports of dev's bridge device, excluding
2175 * the addresses from dev itself.
2176 *
2177 * Returns the number of items added to br_ip_list.
2178 *
2179 * Notes:
2180 * - br_ip_list needs to be initialized by caller
2181 * - br_ip_list might contain duplicates in the end
2182 * (needs to be taken care of by caller)
2183 * - br_ip_list needs to be freed by caller
2184 */
2185int br_multicast_list_adjacent(struct net_device *dev,
2186 struct list_head *br_ip_list)
2187{
2188 struct net_bridge *br;
2189 struct net_bridge_port *port;
2190 struct net_bridge_port_group *group;
2191 struct br_ip_list *entry;
2192 int count = 0;
2193
2194 rcu_read_lock();
2195 if (!br_ip_list || !br_port_exists(dev))
2196 goto unlock;
2197
2198 port = br_port_get_rcu(dev);
2199 if (!port || !port->br)
2200 goto unlock;
2201
2202 br = port->br;
2203
2204 list_for_each_entry_rcu(port, &br->port_list, list) {
2205 if (!port->dev || port->dev == dev)
2206 continue;
2207
2208 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2209 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2210 if (!entry)
2211 goto unlock;
2212
2213 entry->addr = group->addr;
2214 list_add(&entry->list, br_ip_list);
2215 count++;
2216 }
2217 }
2218
2219unlock:
2220 rcu_read_unlock();
2221 return count;
2222}
2223EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2cd41431 2224
c34963e2
LL		 2225/**
2226 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2227 * @dev: The bridge port providing the bridge on which to check for a querier
2228 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2229 *
2230 * Checks whether the given interface has a bridge on top and if so returns
2231 * true if a valid querier exists anywhere on the bridged link layer.
2232 * Otherwise returns false.
2233 */
2234bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2235{
2236 struct net_bridge *br;
2237 struct net_bridge_port *port;
2238 struct ethhdr eth;
2239 bool ret = false;
2240
2241 rcu_read_lock();
2242 if (!br_port_exists(dev))
2243 goto unlock;
2244
2245 port = br_port_get_rcu(dev);
2246 if (!port || !port->br)
2247 goto unlock;
2248
2249 br = port->br;
2250
2251 memset(&eth, 0, sizeof(eth));
2252 eth.h_proto = htons(proto);
2253
2254 ret = br_multicast_querier_exists(br, &eth);
2255
2256unlock:
2257 rcu_read_unlock();
2258 return ret;
2259}
2260EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2261
2cd41431
LL		 2262/**
2263 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2264 * @dev: The bridge port adjacent to which to check for a querier
2265 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2266 *
2267 * Checks whether the given interface has a bridge on top and if so returns
2268 * true if a selected querier is behind one of the other ports of this
2269 * bridge. Otherwise returns false.
2270 */
2271bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2272{
2273 struct net_bridge *br;
2274 struct net_bridge_port *port;
2275 bool ret = false;
2276
2277 rcu_read_lock();
2278 if (!br_port_exists(dev))
2279 goto unlock;
2280
2281 port = br_port_get_rcu(dev);
2282 if (!port || !port->br)
2283 goto unlock;
2284
2285 br = port->br;
2286
2287 switch (proto) {
2288 case ETH_P_IP:
2289 if (!timer_pending(&br->ip4_other_query.timer) ||
2290 rcu_dereference(br->ip4_querier.port) == port)
2291 goto unlock;
2292 break;
3993c4e1 2293#if IS_ENABLED(CONFIG_IPV6)
2cd41431
LL		 2294 case ETH_P_IPV6:
2295 if (!timer_pending(&br->ip6_other_query.timer) ||
2296 rcu_dereference(br->ip6_querier.port) == port)
2297 goto unlock;
2298 break;
3993c4e1 2299#endif
2cd41431
LL		 2300 default:
2301 goto unlock;
2302 }
2303
2304 ret = true;
2305unlock:
2306 rcu_read_unlock();
2307 return ret;
2308}
2309EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
1080ab95
NA		 2310
2311static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
a65056ec 2312 const struct sk_buff *skb, u8 type, u8 dir)
1080ab95
NA		 2313{
2314 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
a65056ec
NA		 2315 __be16 proto = skb->protocol;
2316 unsigned int t_len;
1080ab95
NA		 2317
2318 u64_stats_update_begin(&pstats->syncp);
2319 switch (proto) {
2320 case htons(ETH_P_IP):
a65056ec 2321 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
1080ab95
NA		 2322 switch (type) {
2323 case IGMP_HOST_MEMBERSHIP_REPORT:
2324 pstats->mstats.igmp_v1reports[dir]++;
2325 break;
2326 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2327 pstats->mstats.igmp_v2reports[dir]++;
2328 break;
2329 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2330 pstats->mstats.igmp_v3reports[dir]++;
2331 break;
2332 case IGMP_HOST_MEMBERSHIP_QUERY:
a65056ec
NA		 2333 if (t_len != sizeof(struct igmphdr)) {
2334 pstats->mstats.igmp_v3queries[dir]++;
2335 } else {
2336 unsigned int offset = skb_transport_offset(skb);
2337 struct igmphdr *ih, _ihdr;
2338
2339 ih = skb_header_pointer(skb, offset,
2340 sizeof(_ihdr), &_ihdr);
2341 if (!ih)
2342 break;
2343 if (!ih->code)
2344 pstats->mstats.igmp_v1queries[dir]++;
2345 else
2346 pstats->mstats.igmp_v2queries[dir]++;
2347 }
1080ab95
NA		 2348 break;
2349 case IGMP_HOST_LEAVE_MESSAGE:
2350 pstats->mstats.igmp_leaves[dir]++;
2351 break;
2352 }
2353 break;
2354#if IS_ENABLED(CONFIG_IPV6)
2355 case htons(ETH_P_IPV6):
a65056ec
NA		 2356 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2357 sizeof(struct ipv6hdr);
2358 t_len -= skb_network_header_len(skb);
1080ab95
NA		 2359 switch (type) {
2360 case ICMPV6_MGM_REPORT:
2361 pstats->mstats.mld_v1reports[dir]++;
2362 break;
2363 case ICMPV6_MLD2_REPORT:
2364 pstats->mstats.mld_v2reports[dir]++;
2365 break;
2366 case ICMPV6_MGM_QUERY:
a65056ec
NA		 2367 if (t_len != sizeof(struct mld_msg))
2368 pstats->mstats.mld_v2queries[dir]++;
2369 else
2370 pstats->mstats.mld_v1queries[dir]++;
1080ab95
NA		 2371 break;
2372 case ICMPV6_MGM_REDUCTION:
2373 pstats->mstats.mld_leaves[dir]++;
2374 break;
2375 }
2376 break;
2377#endif /* CONFIG_IPV6 */
2378 }
2379 u64_stats_update_end(&pstats->syncp);
2380}
2381
2382void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
a65056ec 2383 const struct sk_buff *skb, u8 type, u8 dir)
1080ab95
NA		 2384{
2385 struct bridge_mcast_stats __percpu *stats;
2386
2387 /* if multicast_disabled is true then igmp type can't be set */
675779ad 2388 if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
1080ab95
NA		 2389 return;
2390
2391 if (p)
2392 stats = p->mcast_stats;
2393 else
2394 stats = br->mcast_stats;
2395 if (WARN_ON(!stats))
2396 return;
2397
a65056ec 2398 br_mcast_stats_add(stats, skb, type, dir);
1080ab95
NA		 2399}
2400
2401int br_multicast_init_stats(struct net_bridge *br)
2402{
2403 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2404 if (!br->mcast_stats)
2405 return -ENOMEM;
2406
2407 return 0;
2408}
2409
b6fe0440
IS		 2410void br_multicast_uninit_stats(struct net_bridge *br)
2411{
2412 free_percpu(br->mcast_stats);
2413}
2414
1080ab95
NA		 2415static void mcast_stats_add_dir(u64 *dst, u64 *src)
2416{
2417 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2418 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2419}
2420
2421void br_multicast_get_stats(const struct net_bridge *br,
2422 const struct net_bridge_port *p,
2423 struct br_mcast_stats *dest)
2424{
2425 struct bridge_mcast_stats __percpu *stats;
2426 struct br_mcast_stats tdst;
2427 int i;
2428
2429 memset(dest, 0, sizeof(*dest));
2430 if (p)
2431 stats = p->mcast_stats;
2432 else
2433 stats = br->mcast_stats;
2434 if (WARN_ON(!stats))
2435 return;
2436
2437 memset(&tdst, 0, sizeof(tdst));
2438 for_each_possible_cpu(i) {
2439 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2440 struct br_mcast_stats temp;
2441 unsigned int start;
2442
2443 do {
2444 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2445 memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2446 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2447
a65056ec
NA		 2448 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2449 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2450 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
1080ab95
NA		 2451 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2452 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2453 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2454 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2455 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2456
a65056ec
NA		 2457 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2458 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
1080ab95
NA		 2459 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2460 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2461 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2462 tdst.mld_parse_errors += temp.mld_parse_errors;
2463 }
2464 memcpy(dest, &tdst, sizeof(*dest));
2465}
19e3a9c9
NA		 2466
2467int br_mdb_hash_init(struct net_bridge *br)
2468{
2469 return rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params);
2470}
2471
2472void br_mdb_hash_fini(struct net_bridge *br)
2473{
2474 rhashtable_destroy(&br->mdb_hash_tbl);
2475}
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git