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Merge tag 'mlx5e-updates-2018-12-04' of git://git.kernel.org/pub/scm/linux/kernel...
[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>
17#include <linux/jhash.h>
18#include <linux/kernel.h>
b195167f 19#include <linux/log2.h>
eb1d1641
HX		 20#include <linux/netdevice.h>
21#include <linux/netfilter_bridge.h>
22#include <linux/random.h>
23#include <linux/rculist.h>
24#include <linux/skbuff.h>
25#include <linux/slab.h>
26#include <linux/timer.h>
1c8ad5bf 27#include <linux/inetdevice.h>
91b02d3d 28#include <linux/mroute.h>
eb1d1641 29#include <net/ip.h>
147c1e9b 30#include <net/switchdev.h>
dfd56b8b 31#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 32#include <net/ipv6.h>
33#include <net/mld.h>
d4c4f07d 34#include <net/ip6_checksum.h>
3c3769e6 35#include <net/addrconf.h>
08b202b6 36#endif
eb1d1641
HX		 37
38#include "br_private.h"
39
cc0fdd80 40static void br_multicast_start_querier(struct net_bridge *br,
90010b36 41 struct bridge_mcast_own_query *query);
754bc547
SA		 42static void br_multicast_add_router(struct net_bridge *br,
43 struct net_bridge_port *port);
bc8c20ac
SA		 44static void br_ip4_multicast_leave_group(struct net_bridge *br,
45 struct net_bridge_port *port,
46 __be32 group,
6db6f0ea
FF		 47 __u16 vid,
48 const unsigned char *src);
49
f12e7d95 50static void __del_port_router(struct net_bridge_port *p);
bc8c20ac
SA		 51#if IS_ENABLED(CONFIG_IPV6)
52static void br_ip6_multicast_leave_group(struct net_bridge *br,
53 struct net_bridge_port *port,
54 const struct in6_addr *group,
6db6f0ea 55 __u16 vid, const unsigned char *src);
bc8c20ac 56#endif
2ce297fc 57unsigned int br_mdb_rehash_seq;
c83b8fab 58
8ef2a9a5
YH		 59static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
60{
61 if (a->proto != b->proto)
62 return 0;
b0e9a30d
VY		 63 if (a->vid != b->vid)
64 return 0;
8ef2a9a5
YH		 65 switch (a->proto) {
66 case htons(ETH_P_IP):
67 return a->u.ip4 == b->u.ip4;
dfd56b8b 68#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 69 case htons(ETH_P_IPV6):
70 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
71#endif
8ef2a9a5
YH		 72 }
73 return 0;
74}
75
b0e9a30d
VY		 76static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
77 __u16 vid)
eb1d1641 78{
b0e9a30d 79 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
eb1d1641
HX		 80}
81
dfd56b8b 82#if IS_ENABLED(CONFIG_IPV6)
08b202b6 83static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
b0e9a30d
VY		 84 const struct in6_addr *ip,
85 __u16 vid)
08b202b6 86{
b0e9a30d
VY		 87 return jhash_2words(ipv6_addr_hash(ip), vid,
88 mdb->secret) & (mdb->max - 1);
08b202b6
YH		 89}
90#endif
91
8ef2a9a5
YH		 92static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
93 struct br_ip *ip)
94{
95 switch (ip->proto) {
96 case htons(ETH_P_IP):
b0e9a30d 97 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
dfd56b8b 98#if IS_ENABLED(CONFIG_IPV6)
08b202b6 99 case htons(ETH_P_IPV6):
b0e9a30d 100 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
08b202b6 101#endif
8ef2a9a5
YH		 102 }
103 return 0;
eb1d1641
HX		 104}
105
106static struct net_bridge_mdb_entry *__br_mdb_ip_get(
8ef2a9a5 107 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
eb1d1641
HX		 108{
109 struct net_bridge_mdb_entry *mp;
eb1d1641 110
b67bfe0d 111 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
8ef2a9a5 112 if (br_ip_equal(&mp->addr, dst))
eb1d1641
HX		 113 return mp;
114 }
115
116 return NULL;
117}
118
cfd56754
CW		 119struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
120 struct br_ip *dst)
7f285fa7
HX		 121{
122 if (!mdb)
123 return NULL;
124
125 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
126}
127
8ef2a9a5 128static struct net_bridge_mdb_entry *br_mdb_ip4_get(
b0e9a30d 129 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
eb1d1641 130{
8ef2a9a5
YH		 131 struct br_ip br_dst;
132
133 br_dst.u.ip4 = dst;
134 br_dst.proto = htons(ETH_P_IP);
b0e9a30d 135 br_dst.vid = vid;
0821ec55 136
7f285fa7 137 return br_mdb_ip_get(mdb, &br_dst);
8ef2a9a5
YH		 138}
139
dfd56b8b 140#if IS_ENABLED(CONFIG_IPV6)
08b202b6 141static struct net_bridge_mdb_entry *br_mdb_ip6_get(
b0e9a30d
VY		 142 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
143 __u16 vid)
08b202b6
YH		 144{
145 struct br_ip br_dst;
0821ec55 146
4e3fd7a0 147 br_dst.u.ip6 = *dst;
08b202b6 148 br_dst.proto = htons(ETH_P_IPV6);
b0e9a30d 149 br_dst.vid = vid;
08b202b6 150
7f285fa7 151 return br_mdb_ip_get(mdb, &br_dst);
08b202b6
YH		 152}
153#endif
154
eb1d1641 155struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
fbca58a2 156 struct sk_buff *skb, u16 vid)
eb1d1641 157{
e8051688 158 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
8ef2a9a5
YH		 159 struct br_ip ip;
160
13cefad2 161 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
eb1d1641
HX		 162 return NULL;
163
8ef2a9a5 164 if (BR_INPUT_SKB_CB(skb)->igmp)
eb1d1641
HX		 165 return NULL;
166
8ef2a9a5 167 ip.proto = skb->protocol;
fbca58a2 168 ip.vid = vid;
8ef2a9a5 169
eb1d1641
HX		 170 switch (skb->protocol) {
171 case htons(ETH_P_IP):
8ef2a9a5
YH		 172 ip.u.ip4 = ip_hdr(skb)->daddr;
173 break;
dfd56b8b 174#if IS_ENABLED(CONFIG_IPV6)
08b202b6 175 case htons(ETH_P_IPV6):
4e3fd7a0 176 ip.u.ip6 = ipv6_hdr(skb)->daddr;
08b202b6
YH		 177 break;
178#endif
8ef2a9a5
YH		 179 default:
180 return NULL;
eb1d1641
HX		 181 }
182
8ef2a9a5 183 return br_mdb_ip_get(mdb, &ip);
eb1d1641
HX		 184}
185
186static void br_mdb_free(struct rcu_head *head)
187{
188 struct net_bridge_mdb_htable *mdb =
189 container_of(head, struct net_bridge_mdb_htable, rcu);
190 struct net_bridge_mdb_htable *old = mdb->old;
191
192 mdb->old = NULL;
193 kfree(old->mhash);
194 kfree(old);
195}
196
197static int br_mdb_copy(struct net_bridge_mdb_htable *new,
198 struct net_bridge_mdb_htable *old,
199 int elasticity)
200{
201 struct net_bridge_mdb_entry *mp;
eb1d1641
HX		 202 int maxlen;
203 int len;
204 int i;
205
206 for (i = 0; i < old->max; i++)
b67bfe0d 207 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
eb1d1641 208 hlist_add_head(&mp->hlist[new->ver],
8ef2a9a5 209 &new->mhash[br_ip_hash(new, &mp->addr)]);
eb1d1641
HX		 210
211 if (!elasticity)
212 return 0;
213
214 maxlen = 0;
215 for (i = 0; i < new->max; i++) {
216 len = 0;
b67bfe0d 217 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
eb1d1641
HX		 218 len++;
219 if (len > maxlen)
220 maxlen = len;
221 }
222
223 return maxlen > elasticity ? -EINVAL : 0;
224}
225
cfd56754 226void br_multicast_free_pg(struct rcu_head *head)
eb1d1641
HX		 227{
228 struct net_bridge_port_group *p =
229 container_of(head, struct net_bridge_port_group, rcu);
230
231 kfree(p);
232}
233
234static void br_multicast_free_group(struct rcu_head *head)
235{
236 struct net_bridge_mdb_entry *mp =
237 container_of(head, struct net_bridge_mdb_entry, rcu);
238
239 kfree(mp);
240}
241
88c1f37f 242static void br_multicast_group_expired(struct timer_list *t)
eb1d1641 243{
88c1f37f 244 struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer);
eb1d1641
HX		 245 struct net_bridge *br = mp->br;
246 struct net_bridge_mdb_htable *mdb;
247
248 spin_lock(&br->multicast_lock);
249 if (!netif_running(br->dev) || timer_pending(&mp->timer))
250 goto out;
251
ff0fd34e 252 mp->host_joined = false;
2a26028d 253 br_mdb_notify(br->dev, NULL, &mp->addr, RTM_DELMDB, 0);
eb1d1641
HX		 254
255 if (mp->ports)
256 goto out;
257
e8051688
ED		 258 mdb = mlock_dereference(br->mdb, br);
259
eb1d1641
HX		 260 hlist_del_rcu(&mp->hlist[mdb->ver]);
261 mdb->size--;
262
eb1d1641
HX		 263 call_rcu_bh(&mp->rcu, br_multicast_free_group);
264
265out:
266 spin_unlock(&br->multicast_lock);
267}
268
269static void br_multicast_del_pg(struct net_bridge *br,
270 struct net_bridge_port_group *pg)
271{
e8051688 272 struct net_bridge_mdb_htable *mdb;
eb1d1641
HX		 273 struct net_bridge_mdb_entry *mp;
274 struct net_bridge_port_group *p;
e8051688
ED		 275 struct net_bridge_port_group __rcu **pp;
276
277 mdb = mlock_dereference(br->mdb, br);
eb1d1641 278
8ef2a9a5 279 mp = br_mdb_ip_get(mdb, &pg->addr);
eb1d1641
HX		 280 if (WARN_ON(!mp))
281 return;
282
e8051688
ED		 283 for (pp = &mp->ports;
284 (p = mlock_dereference(*pp, br)) != NULL;
285 pp = &p->next) {
eb1d1641
HX		 286 if (p != pg)
287 continue;
288
83f6a740 289 rcu_assign_pointer(*pp, p->next);
eb1d1641
HX		 290 hlist_del_init(&p->mglist);
291 del_timer(&p->timer);
45ebcce5
ER		 292 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
293 p->flags);
eb1d1641
HX		 294 call_rcu_bh(&p->rcu, br_multicast_free_pg);
295
ff0fd34e 296 if (!mp->ports && !mp->host_joined &&
eb1d1641
HX		 297 netif_running(br->dev))
298 mod_timer(&mp->timer, jiffies);
299
300 return;
301 }
302
303 WARN_ON(1);
304}
305
88c1f37f 306static void br_multicast_port_group_expired(struct timer_list *t)
eb1d1641 307{
88c1f37f 308 struct net_bridge_port_group *pg = from_timer(pg, t, timer);
eb1d1641
HX		 309 struct net_bridge *br = pg->port->br;
310
311 spin_lock(&br->multicast_lock);
312 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
9d06b6d8 313 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
eb1d1641
HX		 314 goto out;
315
316 br_multicast_del_pg(br, pg);
317
318out:
319 spin_unlock(&br->multicast_lock);
320}
321
e8051688 322static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
eb1d1641
HX		 323 int elasticity)
324{
e8051688 325 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
eb1d1641
HX		 326 struct net_bridge_mdb_htable *mdb;
327 int err;
328
329 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
330 if (!mdb)
331 return -ENOMEM;
332
333 mdb->max = max;
334 mdb->old = old;
335
6396bb22 336 mdb->mhash = kcalloc(max, sizeof(*mdb->mhash), GFP_ATOMIC);
eb1d1641
HX		 337 if (!mdb->mhash) {
338 kfree(mdb);
339 return -ENOMEM;
340 }
341
342 mdb->size = old ? old->size : 0;
343 mdb->ver = old ? old->ver ^ 1 : 0;
344
345 if (!old || elasticity)
346 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
347 else
348 mdb->secret = old->secret;
349
350 if (!old)
351 goto out;
352
353 err = br_mdb_copy(mdb, old, elasticity);
354 if (err) {
355 kfree(mdb->mhash);
356 kfree(mdb);
357 return err;
358 }
359
2ce297fc 360 br_mdb_rehash_seq++;
eb1d1641
HX		 361 call_rcu_bh(&mdb->rcu, br_mdb_free);
362
363out:
364 rcu_assign_pointer(*mdbp, mdb);
365
366 return 0;
367}
368
8ef2a9a5 369static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
1080ab95
NA		 370 __be32 group,
371 u8 *igmp_type)
eb1d1641 372{
5e923585
NA		 373 struct igmpv3_query *ihv3;
374 size_t igmp_hdr_size;
eb1d1641
HX		 375 struct sk_buff *skb;
376 struct igmphdr *ih;
377 struct ethhdr *eth;
378 struct iphdr *iph;
379
5e923585
NA		 380 igmp_hdr_size = sizeof(*ih);
381 if (br->multicast_igmp_version == 3)
382 igmp_hdr_size = sizeof(*ihv3);
eb1d1641 383 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
5e923585 384 igmp_hdr_size + 4);
eb1d1641
HX		 385 if (!skb)
386 goto out;
387
388 skb->protocol = htons(ETH_P_IP);
389
390 skb_reset_mac_header(skb);
391 eth = eth_hdr(skb);
392
e5a727f6 393 ether_addr_copy(eth->h_source, br->dev->dev_addr);
eb1d1641
HX		 394 eth->h_dest[0] = 1;
395 eth->h_dest[1] = 0;
396 eth->h_dest[2] = 0x5e;
397 eth->h_dest[3] = 0;
398 eth->h_dest[4] = 0;
399 eth->h_dest[5] = 1;
400 eth->h_proto = htons(ETH_P_IP);
401 skb_put(skb, sizeof(*eth));
402
403 skb_set_network_header(skb, skb->len);
404 iph = ip_hdr(skb);
405
406 iph->version = 4;
407 iph->ihl = 6;
408 iph->tos = 0xc0;
5e923585 409 iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4);
eb1d1641
HX		 410 iph->id = 0;
411 iph->frag_off = htons(IP_DF);
412 iph->ttl = 1;
413 iph->protocol = IPPROTO_IGMP;
675779ad 414 iph->saddr = br_opt_get(br, BROPT_MULTICAST_QUERY_USE_IFADDR) ?
1c8ad5bf 415 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
eb1d1641
HX		 416 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
417 ((u8 *)&iph[1])[0] = IPOPT_RA;
418 ((u8 *)&iph[1])[1] = 4;
419 ((u8 *)&iph[1])[2] = 0;
420 ((u8 *)&iph[1])[3] = 0;
421 ip_send_check(iph);
422 skb_put(skb, 24);
423
424 skb_set_transport_header(skb, skb->len);
1080ab95 425 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
eb1d1641 426
5e923585
NA		 427 switch (br->multicast_igmp_version) {
428 case 2:
429 ih = igmp_hdr(skb);
430 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
431 ih->code = (group ? br->multicast_last_member_interval :
432 br->multicast_query_response_interval) /
433 (HZ / IGMP_TIMER_SCALE);
434 ih->group = group;
435 ih->csum = 0;
436 ih->csum = ip_compute_csum((void *)ih, sizeof(*ih));
437 break;
438 case 3:
439 ihv3 = igmpv3_query_hdr(skb);
440 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
441 ihv3->code = (group ? br->multicast_last_member_interval :
442 br->multicast_query_response_interval) /
443 (HZ / IGMP_TIMER_SCALE);
444 ihv3->group = group;
445 ihv3->qqic = br->multicast_query_interval / HZ;
446 ihv3->nsrcs = 0;
447 ihv3->resv = 0;
448 ihv3->suppress = 0;
449 ihv3->qrv = 2;
450 ihv3->csum = 0;
451 ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3));
452 break;
453 }
454
455 skb_put(skb, igmp_hdr_size);
eb1d1641
HX		 456 __skb_pull(skb, sizeof(*eth));
457
458out:
459 return skb;
460}
461
dfd56b8b 462#if IS_ENABLED(CONFIG_IPV6)
08b202b6 463static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
1080ab95
NA		 464 const struct in6_addr *grp,
465 u8 *igmp_type)
08b202b6 466{
aa2ae3e7
NA		 467 struct mld2_query *mld2q;
468 unsigned long interval;
08b202b6
YH		 469 struct ipv6hdr *ip6h;
470 struct mld_msg *mldq;
aa2ae3e7
NA		 471 size_t mld_hdr_size;
472 struct sk_buff *skb;
08b202b6
YH		 473 struct ethhdr *eth;
474 u8 *hopopt;
08b202b6 475
aa2ae3e7
NA		 476 mld_hdr_size = sizeof(*mldq);
477 if (br->multicast_mld_version == 2)
478 mld_hdr_size = sizeof(*mld2q);
08b202b6 479 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
aa2ae3e7 480 8 + mld_hdr_size);
08b202b6
YH		 481 if (!skb)
482 goto out;
483
484 skb->protocol = htons(ETH_P_IPV6);
485
486 /* Ethernet header */
487 skb_reset_mac_header(skb);
488 eth = eth_hdr(skb);
489
e5a727f6 490 ether_addr_copy(eth->h_source, br->dev->dev_addr);
08b202b6
YH		 491 eth->h_proto = htons(ETH_P_IPV6);
492 skb_put(skb, sizeof(*eth));
493
494 /* IPv6 header + HbH option */
495 skb_set_network_header(skb, skb->len);
496 ip6h = ipv6_hdr(skb);
497
498 *(__force __be32 *)ip6h = htonl(0x60000000);
aa2ae3e7 499 ip6h->payload_len = htons(8 + mld_hdr_size);
08b202b6
YH		 500 ip6h->nexthdr = IPPROTO_HOPOPTS;
501 ip6h->hop_limit = 1;
a7bff75b 502 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
d1d81d4c
UW		 503 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
504 &ip6h->saddr)) {
505 kfree_skb(skb);
675779ad 506 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, false);
d1d81d4c
UW		 507 return NULL;
508 }
0888d5f3 509
675779ad 510 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
36cff5a1 511 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
08b202b6
YH		 512
513 hopopt = (u8 *)(ip6h + 1);
514 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
515 hopopt[1] = 0; /* length of HbH */
516 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
517 hopopt[3] = 2; /* Length of RA Option */
518 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
519 hopopt[5] = 0;
1de5a71c
EZ		 520 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
521 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
08b202b6
YH		 522
523 skb_put(skb, sizeof(*ip6h) + 8);
524
525 /* ICMPv6 */
526 skb_set_transport_header(skb, skb->len);
1080ab95 527 interval = ipv6_addr_any(grp) ?
32de868c
LL		 528 br->multicast_query_response_interval :
529 br->multicast_last_member_interval;
1080ab95 530 *igmp_type = ICMPV6_MGM_QUERY;
aa2ae3e7
NA		 531 switch (br->multicast_mld_version) {
532 case 1:
533 mldq = (struct mld_msg *)icmp6_hdr(skb);
534 mldq->mld_type = ICMPV6_MGM_QUERY;
535 mldq->mld_code = 0;
536 mldq->mld_cksum = 0;
537 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
538 mldq->mld_reserved = 0;
539 mldq->mld_mca = *grp;
540 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
541 sizeof(*mldq), IPPROTO_ICMPV6,
542 csum_partial(mldq,
543 sizeof(*mldq),
544 0));
545 break;
546 case 2:
547 mld2q = (struct mld2_query *)icmp6_hdr(skb);
53631a5f 548 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
aa2ae3e7
NA		 549 mld2q->mld2q_type = ICMPV6_MGM_QUERY;
550 mld2q->mld2q_code = 0;
551 mld2q->mld2q_cksum = 0;
552 mld2q->mld2q_resv1 = 0;
553 mld2q->mld2q_resv2 = 0;
554 mld2q->mld2q_suppress = 0;
555 mld2q->mld2q_qrv = 2;
556 mld2q->mld2q_nsrcs = 0;
557 mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
558 mld2q->mld2q_mca = *grp;
559 mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
560 sizeof(*mld2q),
561 IPPROTO_ICMPV6,
562 csum_partial(mld2q,
563 sizeof(*mld2q),
564 0));
565 break;
566 }
567 skb_put(skb, mld_hdr_size);
08b202b6
YH		 568
569 __skb_pull(skb, sizeof(*eth));
570
571out:
572 return skb;
573}
574#endif
575
8ef2a9a5 576static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
1080ab95
NA		 577 struct br_ip *addr,
578 u8 *igmp_type)
8ef2a9a5
YH		 579{
580 switch (addr->proto) {
581 case htons(ETH_P_IP):
1080ab95 582 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
dfd56b8b 583#if IS_ENABLED(CONFIG_IPV6)
08b202b6 584 case htons(ETH_P_IPV6):
1080ab95
NA		 585 return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
586 igmp_type);
08b202b6 587#endif
8ef2a9a5
YH		 588 }
589 return NULL;
590}
591
eb1d1641 592static struct net_bridge_mdb_entry *br_multicast_get_group(
8ef2a9a5
YH		 593 struct net_bridge *br, struct net_bridge_port *port,
594 struct br_ip *group, int hash)
eb1d1641 595{
e8051688 596 struct net_bridge_mdb_htable *mdb;
eb1d1641 597 struct net_bridge_mdb_entry *mp;
95c96174
ED		 598 unsigned int count = 0;
599 unsigned int max;
eb1d1641
HX		 600 int elasticity;
601 int err;
602
e8051688 603 mdb = rcu_dereference_protected(br->mdb, 1);
b67bfe0d 604 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
eb1d1641 605 count++;
8ef2a9a5 606 if (unlikely(br_ip_equal(group, &mp->addr)))
eb1d1641 607 return mp;
eb1d1641
HX		 608 }
609
610 elasticity = 0;
611 max = mdb->max;
612
613 if (unlikely(count > br->hash_elasticity && count)) {
614 if (net_ratelimit())
28a16c97 615 br_info(br, "Multicast hash table "
616 "chain limit reached: %s\n",
617 port ? port->dev->name : br->dev->name);
eb1d1641
HX		 618
619 elasticity = br->hash_elasticity;
620 }
621
622 if (mdb->size >= max) {
623 max *= 2;
036be6db
TG		 624 if (unlikely(max > br->hash_max)) {
625 br_warn(br, "Multicast hash table maximum of %d "
626 "reached, disabling snooping: %s\n",
627 br->hash_max,
628 port ? port->dev->name : br->dev->name);
eb1d1641
HX		 629 err = -E2BIG;
630disable:
13cefad2 631 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false);
eb1d1641
HX		 632 goto err;
633 }
634 }
635
636 if (max > mdb->max || elasticity) {
637 if (mdb->old) {
638 if (net_ratelimit())
28a16c97 639 br_info(br, "Multicast hash table "
640 "on fire: %s\n",
641 port ? port->dev->name : br->dev->name);
eb1d1641
HX		 642 err = -EEXIST;
643 goto err;
644 }
645
646 err = br_mdb_rehash(&br->mdb, max, elasticity);
647 if (err) {
28a16c97 648 br_warn(br, "Cannot rehash multicast "
649 "hash table, disabling snooping: %s, %d, %d\n",
650 port ? port->dev->name : br->dev->name,
651 mdb->size, err);
eb1d1641
HX		 652 goto disable;
653 }
654
655 err = -EAGAIN;
656 goto err;
657 }
658
659 return NULL;
660
661err:
662 mp = ERR_PTR(err);
663 return mp;
664}
665
cfd56754 666struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
5e923585
NA		 667 struct net_bridge_port *p,
668 struct br_ip *group)
eb1d1641 669{
e8051688 670 struct net_bridge_mdb_htable *mdb;
eb1d1641
HX		 671 struct net_bridge_mdb_entry *mp;
672 int hash;
4c0833bc 673 int err;
eb1d1641 674
e8051688 675 mdb = rcu_dereference_protected(br->mdb, 1);
eb1d1641 676 if (!mdb) {
4c0833bc
TK		 677 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
678 if (err)
679 return ERR_PTR(err);
eb1d1641
HX		 680 goto rehash;
681 }
682
683 hash = br_ip_hash(mdb, group);
5e923585 684 mp = br_multicast_get_group(br, p, group, hash);
eb1d1641
HX		 685 switch (PTR_ERR(mp)) {
686 case 0:
687 break;
688
689 case -EAGAIN:
690rehash:
e8051688 691 mdb = rcu_dereference_protected(br->mdb, 1);
eb1d1641
HX		 692 hash = br_ip_hash(mdb, group);
693 break;
694
695 default:
696 goto out;
697 }
698
699 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
700 if (unlikely(!mp))
4c0833bc 701 return ERR_PTR(-ENOMEM);
eb1d1641
HX		 702
703 mp->br = br;
8ef2a9a5 704 mp->addr = *group;
88c1f37f 705 timer_setup(&mp->timer, br_multicast_group_expired, 0);
1faabf2a 706
eb1d1641
HX		 707 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
708 mdb->size++;
709
710out:
711 return mp;
712}
713
cfd56754
CW		 714struct net_bridge_port_group *br_multicast_new_port_group(
715 struct net_bridge_port *port,
716 struct br_ip *group,
ccb1c31a 717 struct net_bridge_port_group __rcu *next,
6db6f0ea
FF		 718 unsigned char flags,
719 const unsigned char *src)
cfd56754
CW		 720{
721 struct net_bridge_port_group *p;
722
723 p = kzalloc(sizeof(*p), GFP_ATOMIC);
724 if (unlikely(!p))
725 return NULL;
726
727 p->addr = *group;
728 p->port = port;
9d06b6d8 729 p->flags = flags;
eca2a43b 730 rcu_assign_pointer(p->next, next);
cfd56754 731 hlist_add_head(&p->mglist, &port->mglist);
88c1f37f 732 timer_setup(&p->timer, br_multicast_port_group_expired, 0);
6db6f0ea
FF		 733
734 if (src)
735 memcpy(p->eth_addr, src, ETH_ALEN);
736 else
737 memset(p->eth_addr, 0xff, ETH_ALEN);
738
cfd56754
CW		 739 return p;
740}
741
6db6f0ea
FF		 742static bool br_port_group_equal(struct net_bridge_port_group *p,
743 struct net_bridge_port *port,
744 const unsigned char *src)
745{
746 if (p->port != port)
747 return false;
748
749 if (!(port->flags & BR_MULTICAST_TO_UNICAST))
750 return true;
751
752 return ether_addr_equal(src, p->eth_addr);
753}
754
eb1d1641 755static int br_multicast_add_group(struct net_bridge *br,
8ef2a9a5 756 struct net_bridge_port *port,
6db6f0ea
FF		 757 struct br_ip *group,
758 const unsigned char *src)
eb1d1641 759{
e8051688 760 struct net_bridge_port_group __rcu **pp;
5e923585
NA		 761 struct net_bridge_port_group *p;
762 struct net_bridge_mdb_entry *mp;
454594f3 763 unsigned long now = jiffies;
eb1d1641
HX		 764 int err;
765
eb1d1641
HX		 766 spin_lock(&br->multicast_lock);
767 if (!netif_running(br->dev) ||
768 (port && port->state == BR_STATE_DISABLED))
769 goto out;
770
771 mp = br_multicast_new_group(br, port, group);
772 err = PTR_ERR(mp);
4c0833bc 773 if (IS_ERR(mp))
eb1d1641
HX		 774 goto err;
775
776 if (!port) {
2a26028d
AL		 777 if (!mp->host_joined) {
778 mp->host_joined = true;
779 br_mdb_notify(br->dev, NULL, &mp->addr, RTM_NEWMDB, 0);
780 }
454594f3 781 mod_timer(&mp->timer, now + br->multicast_membership_interval);
eb1d1641
HX		 782 goto out;
783 }
784
e8051688
ED		 785 for (pp = &mp->ports;
786 (p = mlock_dereference(*pp, br)) != NULL;
787 pp = &p->next) {
6db6f0ea 788 if (br_port_group_equal(p, port, src))
454594f3 789 goto found;
eb1d1641
HX		 790 if ((unsigned long)p->port < (unsigned long)port)
791 break;
792 }
793
6db6f0ea 794 p = br_multicast_new_port_group(port, group, *pp, 0, src);
eb1d1641
HX		 795 if (unlikely(!p))
796 goto err;
eb1d1641 797 rcu_assign_pointer(*pp, p);
45ebcce5 798 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
eb1d1641 799
454594f3
LL		 800found:
801 mod_timer(&p->timer, now + br->multicast_membership_interval);
eb1d1641
HX		 802out:
803 err = 0;
804
805err:
806 spin_unlock(&br->multicast_lock);
807 return err;
808}
809
8ef2a9a5
YH		 810static int br_ip4_multicast_add_group(struct net_bridge *br,
811 struct net_bridge_port *port,
b0e9a30d 812 __be32 group,
6db6f0ea
FF		 813 __u16 vid,
814 const unsigned char *src)
8ef2a9a5
YH		 815{
816 struct br_ip br_group;
817
818 if (ipv4_is_local_multicast(group))
819 return 0;
820
821 br_group.u.ip4 = group;
822 br_group.proto = htons(ETH_P_IP);
b0e9a30d 823 br_group.vid = vid;
8ef2a9a5 824
6db6f0ea 825 return br_multicast_add_group(br, port, &br_group, src);
8ef2a9a5
YH		 826}
827
dfd56b8b 828#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 829static int br_ip6_multicast_add_group(struct net_bridge *br,
830 struct net_bridge_port *port,
b0e9a30d 831 const struct in6_addr *group,
6db6f0ea
FF		 832 __u16 vid,
833 const unsigned char *src)
08b202b6
YH		 834{
835 struct br_ip br_group;
836
3c3769e6 837 if (ipv6_addr_is_ll_all_nodes(group))
08b202b6
YH		 838 return 0;
839
4e3fd7a0 840 br_group.u.ip6 = *group;
9cc6e0c4 841 br_group.proto = htons(ETH_P_IPV6);
b0e9a30d 842 br_group.vid = vid;
08b202b6 843
6db6f0ea 844 return br_multicast_add_group(br, port, &br_group, src);
08b202b6
YH		 845}
846#endif
847
88c1f37f 848static void br_multicast_router_expired(struct timer_list *t)
eb1d1641 849{
88c1f37f
AP		 850 struct net_bridge_port *port =
851 from_timer(port, t, multicast_router_timer);
eb1d1641
HX		 852 struct net_bridge *br = port->br;
853
854 spin_lock(&br->multicast_lock);
a55d8246
NA		 855 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
856 port->multicast_router == MDB_RTR_TYPE_PERM ||
f12e7d95 857 timer_pending(&port->multicast_router_timer))
eb1d1641
HX		 858 goto out;
859
f12e7d95 860 __del_port_router(port);
eb1d1641
HX		 861out:
862 spin_unlock(&br->multicast_lock);
863}
864
77041420
YG		 865static void br_mc_router_state_change(struct net_bridge *p,
866 bool is_mc_router)
867{
868 struct switchdev_attr attr = {
869 .orig_dev = p->dev,
870 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
871 .flags = SWITCHDEV_F_DEFER,
872 .u.mrouter = is_mc_router,
873 };
874
875 switchdev_port_attr_set(p->dev, &attr);
876}
877
88c1f37f 878static void br_multicast_local_router_expired(struct timer_list *t)
eb1d1641 879{
88c1f37f 880 struct net_bridge *br = from_timer(br, t, multicast_router_timer);
77041420
YG		 881
882 spin_lock(&br->multicast_lock);
883 if (br->multicast_router == MDB_RTR_TYPE_DISABLED ||
884 br->multicast_router == MDB_RTR_TYPE_PERM ||
885 timer_pending(&br->multicast_router_timer))
886 goto out;
887
888 br_mc_router_state_change(br, false);
889out:
890 spin_unlock(&br->multicast_lock);
eb1d1641
HX		 891}
892
cc0fdd80 893static void br_multicast_querier_expired(struct net_bridge *br,
90010b36 894 struct bridge_mcast_own_query *query)
c83b8fab 895{
c83b8fab 896 spin_lock(&br->multicast_lock);
13cefad2 897 if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
c83b8fab
HX		 898 goto out;
899
cc0fdd80 900 br_multicast_start_querier(br, query);
c83b8fab
HX		 901
902out:
903 spin_unlock(&br->multicast_lock);
904}
905
88c1f37f 906static void br_ip4_multicast_querier_expired(struct timer_list *t)
cc0fdd80 907{
88c1f37f 908 struct net_bridge *br = from_timer(br, t, ip4_other_query.timer);
cc0fdd80 909
90010b36 910 br_multicast_querier_expired(br, &br->ip4_own_query);
cc0fdd80
LL		 911}
912
913#if IS_ENABLED(CONFIG_IPV6)
88c1f37f 914static void br_ip6_multicast_querier_expired(struct timer_list *t)
cc0fdd80 915{
88c1f37f 916 struct net_bridge *br = from_timer(br, t, ip6_other_query.timer);
cc0fdd80 917
90010b36 918 br_multicast_querier_expired(br, &br->ip6_own_query);
cc0fdd80
LL		 919}
920#endif
921
dc4eb53a
LL		 922static void br_multicast_select_own_querier(struct net_bridge *br,
923 struct br_ip *ip,
924 struct sk_buff *skb)
925{
926 if (ip->proto == htons(ETH_P_IP))
927 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
928#if IS_ENABLED(CONFIG_IPV6)
929 else
930 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
931#endif
932}
933
8ef2a9a5
YH		 934static void __br_multicast_send_query(struct net_bridge *br,
935 struct net_bridge_port *port,
936 struct br_ip *ip)
eb1d1641 937{
eb1d1641 938 struct sk_buff *skb;
1080ab95 939 u8 igmp_type;
eb1d1641 940
1080ab95 941 skb = br_multicast_alloc_query(br, ip, &igmp_type);
eb1d1641 942 if (!skb)
8ef2a9a5 943 return;
eb1d1641
HX		 944
945 if (port) {
eb1d1641 946 skb->dev = port->dev;
a65056ec 947 br_multicast_count(br, port, skb, igmp_type,
1080ab95 948 BR_MCAST_DIR_TX);
29a26a56
EB		 949 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
950 dev_net(port->dev), NULL, skb, NULL, skb->dev,
f0b4eece 951 br_dev_queue_push_xmit);
dc4eb53a
LL		 952 } else {
953 br_multicast_select_own_querier(br, ip, skb);
a65056ec 954 br_multicast_count(br, port, skb, igmp_type,
1080ab95 955 BR_MCAST_DIR_RX);
eb1d1641 956 netif_rx(skb);
dc4eb53a 957 }
8ef2a9a5
YH		 958}
959
960static void br_multicast_send_query(struct net_bridge *br,
cc0fdd80 961 struct net_bridge_port *port,
90010b36 962 struct bridge_mcast_own_query *own_query)
8ef2a9a5 963{
90010b36 964 struct bridge_mcast_other_query *other_query = NULL;
5e923585
NA		 965 struct br_ip br_group;
966 unsigned long time;
8ef2a9a5 967
13cefad2
NA		 968 if (!netif_running(br->dev) ||
969 !br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
675779ad 970 !br_opt_get(br, BROPT_MULTICAST_QUERIER))
8ef2a9a5
YH		 971 return;
972
08b202b6
YH		 973 memset(&br_group.u, 0, sizeof(br_group.u));
974
90010b36
LL		 975 if (port ? (own_query == &port->ip4_own_query) :
976 (own_query == &br->ip4_own_query)) {
977 other_query = &br->ip4_other_query;
cc0fdd80 978 br_group.proto = htons(ETH_P_IP);
dfd56b8b 979#if IS_ENABLED(CONFIG_IPV6)
cc0fdd80 980 } else {
90010b36 981 other_query = &br->ip6_other_query;
cc0fdd80 982 br_group.proto = htons(ETH_P_IPV6);
08b202b6 983#endif
cc0fdd80
LL		 984 }
985
90010b36 986 if (!other_query || timer_pending(&other_query->timer))
cc0fdd80
LL		 987 return;
988
989 __br_multicast_send_query(br, port, &br_group);
eb1d1641 990
eb1d1641 991 time = jiffies;
90010b36 992 time += own_query->startup_sent < br->multicast_startup_query_count ?
eb1d1641
HX		 993 br->multicast_startup_query_interval :
994 br->multicast_query_interval;
90010b36 995 mod_timer(&own_query->timer, time);
eb1d1641
HX		 996}
997
90010b36
LL		 998static void
999br_multicast_port_query_expired(struct net_bridge_port *port,
1000 struct bridge_mcast_own_query *query)
eb1d1641 1001{
eb1d1641
HX		 1002 struct net_bridge *br = port->br;
1003
1004 spin_lock(&br->multicast_lock);
02a780c0
DC		 1005 if (port->state == BR_STATE_DISABLED ||
1006 port->state == BR_STATE_BLOCKING)
eb1d1641
HX		 1007 goto out;
1008
cc0fdd80
LL		 1009 if (query->startup_sent < br->multicast_startup_query_count)
1010 query->startup_sent++;
eb1d1641 1011
cc0fdd80 1012 br_multicast_send_query(port->br, port, query);
eb1d1641
HX		 1013
1014out:
1015 spin_unlock(&br->multicast_lock);
1016}
1017
88c1f37f 1018static void br_ip4_multicast_port_query_expired(struct timer_list *t)
cc0fdd80 1019{
88c1f37f 1020 struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer);
cc0fdd80 1021
90010b36 1022 br_multicast_port_query_expired(port, &port->ip4_own_query);
cc0fdd80
LL		 1023}
1024
1025#if IS_ENABLED(CONFIG_IPV6)
88c1f37f 1026static void br_ip6_multicast_port_query_expired(struct timer_list *t)
cc0fdd80 1027{
88c1f37f 1028 struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer);
cc0fdd80 1029
90010b36 1030 br_multicast_port_query_expired(port, &port->ip6_own_query);
cc0fdd80
LL		 1031}
1032#endif
1033
147c1e9b
NF		 1034static void br_mc_disabled_update(struct net_device *dev, bool value)
1035{
1036 struct switchdev_attr attr = {
1037 .orig_dev = dev,
1038 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
1039 .flags = SWITCHDEV_F_DEFER,
13cefad2 1040 .u.mc_disabled = !value,
147c1e9b
NF		 1041 };
1042
1043 switchdev_port_attr_set(dev, &attr);
1044}
1045
1080ab95 1046int br_multicast_add_port(struct net_bridge_port *port)
eb1d1641 1047{
7f0aec7a 1048 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
eb1d1641 1049
88c1f37f
AP		 1050 timer_setup(&port->multicast_router_timer,
1051 br_multicast_router_expired, 0);
1052 timer_setup(&port->ip4_own_query.timer,
1053 br_ip4_multicast_port_query_expired, 0);
cc0fdd80 1054#if IS_ENABLED(CONFIG_IPV6)
88c1f37f
AP		 1055 timer_setup(&port->ip6_own_query.timer,
1056 br_ip6_multicast_port_query_expired, 0);
cc0fdd80 1057#endif
13cefad2
NA		 1058 br_mc_disabled_update(port->dev,
1059 br_opt_get(port->br, BROPT_MULTICAST_ENABLED));
147c1e9b 1060
1080ab95
NA		 1061 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
1062 if (!port->mcast_stats)
1063 return -ENOMEM;
1064
1065 return 0;
eb1d1641
HX		 1066}
1067
1068void br_multicast_del_port(struct net_bridge_port *port)
1069{
e10177ab
SA		 1070 struct net_bridge *br = port->br;
1071 struct net_bridge_port_group *pg;
1072 struct hlist_node *n;
1073
1074 /* Take care of the remaining groups, only perm ones should be left */
1075 spin_lock_bh(&br->multicast_lock);
1076 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1077 br_multicast_del_pg(br, pg);
1078 spin_unlock_bh(&br->multicast_lock);
eb1d1641 1079 del_timer_sync(&port->multicast_router_timer);
1080ab95 1080 free_percpu(port->mcast_stats);
eb1d1641
HX		 1081}
1082
90010b36 1083static void br_multicast_enable(struct bridge_mcast_own_query *query)
561f1103 1084{
cc0fdd80 1085 query->startup_sent = 0;
561f1103 1086
cc0fdd80
LL		 1087 if (try_to_del_timer_sync(&query->timer) >= 0 ||
1088 del_timer(&query->timer))
1089 mod_timer(&query->timer, jiffies);
561f1103
HX		 1090}
1091
7cb3f921 1092static void __br_multicast_enable_port(struct net_bridge_port *port)
eb1d1641
HX		 1093{
1094 struct net_bridge *br = port->br;
1095
13cefad2 1096 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || !netif_running(br->dev))
7cb3f921 1097 return;
eb1d1641 1098
90010b36 1099 br_multicast_enable(&port->ip4_own_query);
cc0fdd80 1100#if IS_ENABLED(CONFIG_IPV6)
90010b36 1101 br_multicast_enable(&port->ip6_own_query);
cc0fdd80 1102#endif
7f0aec7a
NA		 1103 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
1104 hlist_unhashed(&port->rlist))
754bc547 1105 br_multicast_add_router(br, port);
7cb3f921 1106}
eb1d1641 1107
7cb3f921
NA		 1108void br_multicast_enable_port(struct net_bridge_port *port)
1109{
1110 struct net_bridge *br = port->br;
1111
1112 spin_lock(&br->multicast_lock);
1113 __br_multicast_enable_port(port);
eb1d1641
HX		 1114 spin_unlock(&br->multicast_lock);
1115}
1116
1117void br_multicast_disable_port(struct net_bridge_port *port)
1118{
1119 struct net_bridge *br = port->br;
1120 struct net_bridge_port_group *pg;
b67bfe0d 1121 struct hlist_node *n;
eb1d1641
HX		 1122
1123 spin_lock(&br->multicast_lock);
b67bfe0d 1124 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
9d06b6d8 1125 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
e10177ab 1126 br_multicast_del_pg(br, pg);
eb1d1641 1127
f12e7d95
NF		 1128 __del_port_router(port);
1129
eb1d1641 1130 del_timer(&port->multicast_router_timer);
90010b36 1131 del_timer(&port->ip4_own_query.timer);
cc0fdd80 1132#if IS_ENABLED(CONFIG_IPV6)
90010b36 1133 del_timer(&port->ip6_own_query.timer);
cc0fdd80 1134#endif
eb1d1641
HX		 1135 spin_unlock(&br->multicast_lock);
1136}
1137
8ef2a9a5
YH		 1138static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1139 struct net_bridge_port *port,
06499098
VY		 1140 struct sk_buff *skb,
1141 u16 vid)
eb1d1641 1142{
6db6f0ea 1143 const unsigned char *src;
eb1d1641
HX		 1144 struct igmpv3_report *ih;
1145 struct igmpv3_grec *grec;
1146 int i;
1147 int len;
1148 int num;
1149 int type;
1150 int err = 0;
1151 __be32 group;
1152
eb1d1641
HX		 1153 ih = igmpv3_report_hdr(skb);
1154 num = ntohs(ih->ngrec);
c2d4fbd2 1155 len = skb_transport_offset(skb) + sizeof(*ih);
eb1d1641
HX		 1156
1157 for (i = 0; i < num; i++) {
1158 len += sizeof(*grec);
1159 if (!pskb_may_pull(skb, len))
1160 return -EINVAL;
1161
fd218cf9 1162 grec = (void *)(skb->data + len - sizeof(*grec));
eb1d1641
HX		 1163 group = grec->grec_mca;
1164 type = grec->grec_type;
1165
8eabf95c 1166 len += ntohs(grec->grec_nsrcs) * 4;
eb1d1641
HX		 1167 if (!pskb_may_pull(skb, len))
1168 return -EINVAL;
1169
1170 /* We treat this as an IGMPv2 report for now. */
1171 switch (type) {
1172 case IGMPV3_MODE_IS_INCLUDE:
1173 case IGMPV3_MODE_IS_EXCLUDE:
1174 case IGMPV3_CHANGE_TO_INCLUDE:
1175 case IGMPV3_CHANGE_TO_EXCLUDE:
1176 case IGMPV3_ALLOW_NEW_SOURCES:
1177 case IGMPV3_BLOCK_OLD_SOURCES:
1178 break;
1179
1180 default:
1181 continue;
1182 }
1183
6db6f0ea 1184 src = eth_hdr(skb)->h_source;
bc8c20ac
SA		 1185 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1186 type == IGMPV3_MODE_IS_INCLUDE) &&
1187 ntohs(grec->grec_nsrcs) == 0) {
6db6f0ea 1188 br_ip4_multicast_leave_group(br, port, group, vid, src);
bc8c20ac 1189 } else {
6db6f0ea
FF		 1190 err = br_ip4_multicast_add_group(br, port, group, vid,
1191 src);
bc8c20ac
SA		 1192 if (err)
1193 break;
1194 }
eb1d1641
HX		 1195 }
1196
1197 return err;
1198}
1199
dfd56b8b 1200#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1201static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1202 struct net_bridge_port *port,
06499098
VY		 1203 struct sk_buff *skb,
1204 u16 vid)
08b202b6 1205{
6db6f0ea 1206 const unsigned char *src;
08b202b6
YH		 1207 struct icmp6hdr *icmp6h;
1208 struct mld2_grec *grec;
1209 int i;
1210 int len;
1211 int num;
1212 int err = 0;
1213
1214 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1215 return -EINVAL;
1216
1217 icmp6h = icmp6_hdr(skb);
1218 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
c2d4fbd2 1219 len = skb_transport_offset(skb) + sizeof(*icmp6h);
08b202b6
YH		 1220
1221 for (i = 0; i < num; i++) {
1222 __be16 *nsrcs, _nsrcs;
1223
1224 nsrcs = skb_header_pointer(skb,
1225 len + offsetof(struct mld2_grec,
649e984d 1226 grec_nsrcs),
08b202b6
YH		 1227 sizeof(_nsrcs), &_nsrcs);
1228 if (!nsrcs)
1229 return -EINVAL;
1230
1231 if (!pskb_may_pull(skb,
1232 len + sizeof(*grec) +
d41db9f3 1233 sizeof(struct in6_addr) * ntohs(*nsrcs)))
08b202b6
YH		 1234 return -EINVAL;
1235
1236 grec = (struct mld2_grec *)(skb->data + len);
d41db9f3
LL		 1237 len += sizeof(*grec) +
1238 sizeof(struct in6_addr) * ntohs(*nsrcs);
08b202b6
YH		 1239
1240 /* We treat these as MLDv1 reports for now. */
1241 switch (grec->grec_type) {
1242 case MLD2_MODE_IS_INCLUDE:
1243 case MLD2_MODE_IS_EXCLUDE:
1244 case MLD2_CHANGE_TO_INCLUDE:
1245 case MLD2_CHANGE_TO_EXCLUDE:
1246 case MLD2_ALLOW_NEW_SOURCES:
1247 case MLD2_BLOCK_OLD_SOURCES:
1248 break;
1249
1250 default:
1251 continue;
1252 }
1253
6db6f0ea 1254 src = eth_hdr(skb)->h_source;
bc8c20ac
SA		 1255 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1256 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1257 ntohs(*nsrcs) == 0) {
1258 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
6db6f0ea 1259 vid, src);
bc8c20ac
SA		 1260 } else {
1261 err = br_ip6_multicast_add_group(br, port,
6db6f0ea
FF		 1262 &grec->grec_mca, vid,
1263 src);
9264251e 1264 if (err)
bc8c20ac
SA		 1265 break;
1266 }
08b202b6
YH		 1267 }
1268
1269 return err;
1270}
1271#endif
1272
dc4eb53a 1273static bool br_ip4_multicast_select_querier(struct net_bridge *br,
2cd41431 1274 struct net_bridge_port *port,
dc4eb53a
LL		 1275 __be32 saddr)
1276{
1277 if (!timer_pending(&br->ip4_own_query.timer) &&
1278 !timer_pending(&br->ip4_other_query.timer))
1279 goto update;
1280
1281 if (!br->ip4_querier.addr.u.ip4)
1282 goto update;
1283
1284 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1285 goto update;
1286
1287 return false;
1288
1289update:
1290 br->ip4_querier.addr.u.ip4 = saddr;
1291
2cd41431
LL		 1292 /* update protected by general multicast_lock by caller */
1293 rcu_assign_pointer(br->ip4_querier.port, port);
1294
dc4eb53a
LL		 1295 return true;
1296}
1297
1298#if IS_ENABLED(CONFIG_IPV6)
1299static bool br_ip6_multicast_select_querier(struct net_bridge *br,
2cd41431 1300 struct net_bridge_port *port,
dc4eb53a
LL		 1301 struct in6_addr *saddr)
1302{
1303 if (!timer_pending(&br->ip6_own_query.timer) &&
1304 !timer_pending(&br->ip6_other_query.timer))
1305 goto update;
1306
1307 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1308 goto update;
1309
1310 return false;
1311
1312update:
1313 br->ip6_querier.addr.u.ip6 = *saddr;
1314
2cd41431
LL		 1315 /* update protected by general multicast_lock by caller */
1316 rcu_assign_pointer(br->ip6_querier.port, port);
1317
dc4eb53a
LL		 1318 return true;
1319}
1320#endif
1321
1322static bool br_multicast_select_querier(struct net_bridge *br,
2cd41431 1323 struct net_bridge_port *port,
dc4eb53a
LL		 1324 struct br_ip *saddr)
1325{
1326 switch (saddr->proto) {
1327 case htons(ETH_P_IP):
2cd41431 1328 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
dc4eb53a
LL		 1329#if IS_ENABLED(CONFIG_IPV6)
1330 case htons(ETH_P_IPV6):
2cd41431 1331 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
dc4eb53a
LL		 1332#endif
1333 }
1334
1335 return false;
1336}
1337
cc0fdd80 1338static void
90010b36
LL		 1339br_multicast_update_query_timer(struct net_bridge *br,
1340 struct bridge_mcast_other_query *query,
1341 unsigned long max_delay)
b00589af 1342{
90010b36
LL		 1343 if (!timer_pending(&query->timer))
1344 query->delay_time = jiffies + max_delay;
b00589af 1345
90010b36 1346 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
b00589af
LL		 1347}
1348
6d549648
NF		 1349static void br_port_mc_router_state_change(struct net_bridge_port *p,
1350 bool is_mc_router)
1351{
1352 struct switchdev_attr attr = {
1353 .orig_dev = p->dev,
1354 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
1355 .flags = SWITCHDEV_F_DEFER,
1356 .u.mrouter = is_mc_router,
1357 };
1358
1359 switchdev_port_attr_set(p->dev, &attr);
1360}
1361
7e80c124 1362/*
7c77602f 1363 * Add port to router_list
7e80c124 1364 * list is maintained ordered by pointer value
1365 * and locked by br->multicast_lock and RCU
1366 */
0909e117
HX		 1367static void br_multicast_add_router(struct net_bridge *br,
1368 struct net_bridge_port *port)
1369{
dcdca2c4 1370 struct net_bridge_port *p;
b67bfe0d 1371 struct hlist_node *slot = NULL;
dcdca2c4 1372
1a040eac
NA		 1373 if (!hlist_unhashed(&port->rlist))
1374 return;
1375
b67bfe0d 1376 hlist_for_each_entry(p, &br->router_list, rlist) {
7e80c124 1377 if ((unsigned long) port >= (unsigned long) p)
1378 break;
b67bfe0d 1379 slot = &p->rlist;
dcdca2c4 1380 }
1381
7e80c124 1382 if (slot)
1d023284 1383 hlist_add_behind_rcu(&port->rlist, slot);
dcdca2c4 1384 else
1385 hlist_add_head_rcu(&port->rlist, &br->router_list);
949f1e39 1386 br_rtr_notify(br->dev, port, RTM_NEWMDB);
6d549648 1387 br_port_mc_router_state_change(port, true);
0909e117
HX		 1388}
1389
eb1d1641
HX		 1390static void br_multicast_mark_router(struct net_bridge *br,
1391 struct net_bridge_port *port)
1392{
1393 unsigned long now = jiffies;
eb1d1641
HX		 1394
1395 if (!port) {
77041420
YG		 1396 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
1397 if (!timer_pending(&br->multicast_router_timer))
1398 br_mc_router_state_change(br, true);
eb1d1641
HX		 1399 mod_timer(&br->multicast_router_timer,
1400 now + br->multicast_querier_interval);
77041420 1401 }
eb1d1641
HX		 1402 return;
1403 }
1404
a55d8246
NA		 1405 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1406 port->multicast_router == MDB_RTR_TYPE_PERM)
eb1d1641
HX		 1407 return;
1408
0909e117 1409 br_multicast_add_router(br, port);
eb1d1641 1410
eb1d1641
HX		 1411 mod_timer(&port->multicast_router_timer,
1412 now + br->multicast_querier_interval);
1413}
1414
1415static void br_multicast_query_received(struct net_bridge *br,
1416 struct net_bridge_port *port,
90010b36 1417 struct bridge_mcast_other_query *query,
dc4eb53a 1418 struct br_ip *saddr,
b00589af 1419 unsigned long max_delay)
eb1d1641 1420{
2cd41431 1421 if (!br_multicast_select_querier(br, port, saddr))
eb1d1641
HX		 1422 return;
1423
dc4eb53a 1424 br_multicast_update_query_timer(br, query, max_delay);
5a2de63f
HL		 1425
1426 /* Based on RFC4541, section 2.1.1 IGMP Forwarding Rules,
1427 * the arrival port for IGMP Queries where the source address
1428 * is 0.0.0.0 should not be added to router port list.
1429 */
1430 if ((saddr->proto == htons(ETH_P_IP) && saddr->u.ip4) ||
0fe5119e 1431 saddr->proto == htons(ETH_P_IPV6))
5a2de63f 1432 br_multicast_mark_router(br, port);
eb1d1641
HX		 1433}
1434
9c2e955c 1435static void br_ip4_multicast_query(struct net_bridge *br,
1436 struct net_bridge_port *port,
1437 struct sk_buff *skb,
1438 u16 vid)
eb1d1641 1439{
b71d1d42 1440 const struct iphdr *iph = ip_hdr(skb);
eb1d1641
HX		 1441 struct igmphdr *ih = igmp_hdr(skb);
1442 struct net_bridge_mdb_entry *mp;
1443 struct igmpv3_query *ih3;
1444 struct net_bridge_port_group *p;
e8051688 1445 struct net_bridge_port_group __rcu **pp;
dc4eb53a 1446 struct br_ip saddr;
eb1d1641
HX		 1447 unsigned long max_delay;
1448 unsigned long now = jiffies;
856ce5d0 1449 unsigned int offset = skb_transport_offset(skb);
eb1d1641
HX		 1450 __be32 group;
1451
1452 spin_lock(&br->multicast_lock);
1453 if (!netif_running(br->dev) ||
1454 (port && port->state == BR_STATE_DISABLED))
1455 goto out;
1456
eb1d1641
HX		 1457 group = ih->group;
1458
856ce5d0 1459 if (skb->len == offset + sizeof(*ih)) {
eb1d1641
HX		 1460 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1461
1462 if (!max_delay) {
1463 max_delay = 10 * HZ;
1464 group = 0;
1465 }
856ce5d0 1466 } else if (skb->len >= offset + sizeof(*ih3)) {
eb1d1641
HX		 1467 ih3 = igmpv3_query_hdr(skb);
1468 if (ih3->nsrcs)
bec68ff1 1469 goto out;
eb1d1641 1470
0ba8c9ec
YH		 1471 max_delay = ih3->code ?
1472 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
9afd85c9 1473 } else {
9ed973cc
LL		 1474 goto out;
1475 }
1476
dc4eb53a
LL		 1477 if (!group) {
1478 saddr.proto = htons(ETH_P_IP);
1479 saddr.u.ip4 = iph->saddr;
b00589af 1480
dc4eb53a
LL		 1481 br_multicast_query_received(br, port, &br->ip4_other_query,
1482 &saddr, max_delay);
eb1d1641 1483 goto out;
dc4eb53a 1484 }
eb1d1641 1485
b0e9a30d 1486 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
eb1d1641
HX		 1487 if (!mp)
1488 goto out;
1489
1490 max_delay *= br->multicast_last_member_count;
1491
ff0fd34e 1492 if (mp->host_joined &&
eb1d1641
HX		 1493 (timer_pending(&mp->timer) ?
1494 time_after(mp->timer.expires, now + max_delay) :
1495 try_to_del_timer_sync(&mp->timer) >= 0))
1496 mod_timer(&mp->timer, now + max_delay);
1497
e8051688
ED		 1498 for (pp = &mp->ports;
1499 (p = mlock_dereference(*pp, br)) != NULL;
1500 pp = &p->next) {
eb1d1641
HX		 1501 if (timer_pending(&p->timer) ?
1502 time_after(p->timer.expires, now + max_delay) :
1503 try_to_del_timer_sync(&p->timer) >= 0)
24f9cdcb 1504 mod_timer(&p->timer, now + max_delay);
eb1d1641
HX		 1505 }
1506
1507out:
1508 spin_unlock(&br->multicast_lock);
eb1d1641
HX		 1509}
1510
dfd56b8b 1511#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1512static int br_ip6_multicast_query(struct net_bridge *br,
1513 struct net_bridge_port *port,
06499098
VY		 1514 struct sk_buff *skb,
1515 u16 vid)
08b202b6 1516{
b71d1d42 1517 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
eca2a43b 1518 struct mld_msg *mld;
08b202b6
YH		 1519 struct net_bridge_mdb_entry *mp;
1520 struct mld2_query *mld2q;
e8051688
ED		 1521 struct net_bridge_port_group *p;
1522 struct net_bridge_port_group __rcu **pp;
dc4eb53a 1523 struct br_ip saddr;
08b202b6
YH		 1524 unsigned long max_delay;
1525 unsigned long now = jiffies;
856ce5d0 1526 unsigned int offset = skb_transport_offset(skb);
b71d1d42 1527 const struct in6_addr *group = NULL;
9ed973cc 1528 bool is_general_query;
08b202b6
YH		 1529 int err = 0;
1530
1531 spin_lock(&br->multicast_lock);
1532 if (!netif_running(br->dev) ||
1533 (port && port->state == BR_STATE_DISABLED))
1534 goto out;
1535
856ce5d0
LL		 1536 if (skb->len == offset + sizeof(*mld)) {
1537 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
08b202b6
YH		 1538 err = -EINVAL;
1539 goto out;
1540 }
1541 mld = (struct mld_msg *) icmp6_hdr(skb);
4715213d 1542 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
08b202b6
YH		 1543 if (max_delay)
1544 group = &mld->mld_mca;
248ba8ec 1545 } else {
856ce5d0 1546 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
08b202b6
YH		 1547 err = -EINVAL;
1548 goto out;
1549 }
1550 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1551 if (!mld2q->mld2q_nsrcs)
1552 group = &mld2q->mld2q_mca;
e3f5b170
DB		 1553
1554 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
08b202b6
YH		 1555 }
1556
9ed973cc
LL		 1557 is_general_query = group && ipv6_addr_any(group);
1558
dc4eb53a
LL		 1559 if (is_general_query) {
1560 saddr.proto = htons(ETH_P_IPV6);
1561 saddr.u.ip6 = ip6h->saddr;
b00589af 1562
dc4eb53a
LL		 1563 br_multicast_query_received(br, port, &br->ip6_other_query,
1564 &saddr, max_delay);
08b202b6 1565 goto out;
6c03ee8b
LL		 1566 } else if (!group) {
1567 goto out;
dc4eb53a 1568 }
08b202b6 1569
b0e9a30d 1570 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
08b202b6
YH		 1571 if (!mp)
1572 goto out;
1573
1574 max_delay *= br->multicast_last_member_count;
ff0fd34e 1575 if (mp->host_joined &&
08b202b6
YH		 1576 (timer_pending(&mp->timer) ?
1577 time_after(mp->timer.expires, now + max_delay) :
1578 try_to_del_timer_sync(&mp->timer) >= 0))
1579 mod_timer(&mp->timer, now + max_delay);
1580
e8051688
ED		 1581 for (pp = &mp->ports;
1582 (p = mlock_dereference(*pp, br)) != NULL;
1583 pp = &p->next) {
08b202b6
YH		 1584 if (timer_pending(&p->timer) ?
1585 time_after(p->timer.expires, now + max_delay) :
1586 try_to_del_timer_sync(&p->timer) >= 0)
24f9cdcb 1587 mod_timer(&p->timer, now + max_delay);
08b202b6
YH		 1588 }
1589
1590out:
1591 spin_unlock(&br->multicast_lock);
1592 return err;
1593}
1594#endif
1595
90010b36
LL		 1596static void
1597br_multicast_leave_group(struct net_bridge *br,
1598 struct net_bridge_port *port,
1599 struct br_ip *group,
1600 struct bridge_mcast_other_query *other_query,
6db6f0ea
FF		 1601 struct bridge_mcast_own_query *own_query,
1602 const unsigned char *src)
eb1d1641
HX		 1603{
1604 struct net_bridge_mdb_htable *mdb;
1605 struct net_bridge_mdb_entry *mp;
1606 struct net_bridge_port_group *p;
1607 unsigned long now;
1608 unsigned long time;
1609
eb1d1641
HX		 1610 spin_lock(&br->multicast_lock);
1611 if (!netif_running(br->dev) ||
544586f7 1612 (port && port->state == BR_STATE_DISABLED))
eb1d1641
HX		 1613 goto out;
1614
e8051688 1615 mdb = mlock_dereference(br->mdb, br);
eb1d1641
HX		 1616 mp = br_mdb_ip_get(mdb, group);
1617 if (!mp)
1618 goto out;
1619
544586f7
SA		 1620 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1621 struct net_bridge_port_group __rcu **pp;
1622
1623 for (pp = &mp->ports;
1624 (p = mlock_dereference(*pp, br)) != NULL;
1625 pp = &p->next) {
6db6f0ea 1626 if (!br_port_group_equal(p, port, src))
544586f7
SA		 1627 continue;
1628
1629 rcu_assign_pointer(*pp, p->next);
1630 hlist_del_init(&p->mglist);
1631 del_timer(&p->timer);
1632 call_rcu_bh(&p->rcu, br_multicast_free_pg);
45ebcce5
ER		 1633 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1634 p->flags);
544586f7 1635
ff0fd34e 1636 if (!mp->ports && !mp->host_joined &&
544586f7
SA		 1637 netif_running(br->dev))
1638 mod_timer(&mp->timer, jiffies);
1639 }
1640 goto out;
1641 }
1642
1643 if (timer_pending(&other_query->timer))
1644 goto out;
1645
675779ad 1646 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
6b7df111
CW		 1647 __br_multicast_send_query(br, port, &mp->addr);
1648
1649 time = jiffies + br->multicast_last_member_count *
1650 br->multicast_last_member_interval;
cc0fdd80 1651
90010b36 1652 mod_timer(&own_query->timer, time);
6b7df111
CW		 1653
1654 for (p = mlock_dereference(mp->ports, br);
1655 p != NULL;
1656 p = mlock_dereference(p->next, br)) {
6db6f0ea 1657 if (!br_port_group_equal(p, port, src))
6b7df111
CW		 1658 continue;
1659
1660 if (!hlist_unhashed(&p->mglist) &&
1661 (timer_pending(&p->timer) ?
1662 time_after(p->timer.expires, time) :
1663 try_to_del_timer_sync(&p->timer) >= 0)) {
1664 mod_timer(&p->timer, time);
1665 }
1666
1667 break;
1668 }
1669 }
1670
eb1d1641
HX		 1671 now = jiffies;
1672 time = now + br->multicast_last_member_count *
1673 br->multicast_last_member_interval;
1674
1675 if (!port) {
ff0fd34e 1676 if (mp->host_joined &&
eb1d1641
HX		 1677 (timer_pending(&mp->timer) ?
1678 time_after(mp->timer.expires, time) :
1679 try_to_del_timer_sync(&mp->timer) >= 0)) {
1680 mod_timer(&mp->timer, time);
eb1d1641 1681 }
454594f3
LL		 1682
1683 goto out;
1684 }
1685
1686 for (p = mlock_dereference(mp->ports, br);
1687 p != NULL;
1688 p = mlock_dereference(p->next, br)) {
1689 if (p->port != port)
1690 continue;
1691
1692 if (!hlist_unhashed(&p->mglist) &&
1693 (timer_pending(&p->timer) ?
1694 time_after(p->timer.expires, time) :
1695 try_to_del_timer_sync(&p->timer) >= 0)) {
1696 mod_timer(&p->timer, time);
1697 }
1698
1699 break;
eb1d1641 1700 }
eb1d1641
HX		 1701out:
1702 spin_unlock(&br->multicast_lock);
1703}
1704
8ef2a9a5
YH		 1705static void br_ip4_multicast_leave_group(struct net_bridge *br,
1706 struct net_bridge_port *port,
b0e9a30d 1707 __be32 group,
6db6f0ea
FF		 1708 __u16 vid,
1709 const unsigned char *src)
8ef2a9a5
YH		 1710{
1711 struct br_ip br_group;
90010b36 1712 struct bridge_mcast_own_query *own_query;
8ef2a9a5
YH		 1713
1714 if (ipv4_is_local_multicast(group))
1715 return;
1716
90010b36
LL		 1717 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1718
8ef2a9a5
YH		 1719 br_group.u.ip4 = group;
1720 br_group.proto = htons(ETH_P_IP);
b0e9a30d 1721 br_group.vid = vid;
8ef2a9a5 1722
90010b36 1723 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
6db6f0ea 1724 own_query, src);
8ef2a9a5
YH		 1725}
1726
dfd56b8b 1727#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1728static void br_ip6_multicast_leave_group(struct net_bridge *br,
1729 struct net_bridge_port *port,
b0e9a30d 1730 const struct in6_addr *group,
6db6f0ea
FF		 1731 __u16 vid,
1732 const unsigned char *src)
08b202b6
YH		 1733{
1734 struct br_ip br_group;
90010b36 1735 struct bridge_mcast_own_query *own_query;
08b202b6 1736
3c3769e6 1737 if (ipv6_addr_is_ll_all_nodes(group))
08b202b6
YH		 1738 return;
1739
90010b36
LL		 1740 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1741
4e3fd7a0 1742 br_group.u.ip6 = *group;
08b202b6 1743 br_group.proto = htons(ETH_P_IPV6);
b0e9a30d 1744 br_group.vid = vid;
08b202b6 1745
90010b36 1746 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
6db6f0ea 1747 own_query, src);
08b202b6
YH		 1748}
1749#endif
8ef2a9a5 1750
1080ab95
NA		 1751static void br_multicast_err_count(const struct net_bridge *br,
1752 const struct net_bridge_port *p,
1753 __be16 proto)
1754{
1755 struct bridge_mcast_stats __percpu *stats;
1756 struct bridge_mcast_stats *pstats;
1757
675779ad 1758 if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
1080ab95
NA		 1759 return;
1760
1761 if (p)
1762 stats = p->mcast_stats;
1763 else
1764 stats = br->mcast_stats;
1765 if (WARN_ON(!stats))
1766 return;
1767
1768 pstats = this_cpu_ptr(stats);
1769
1770 u64_stats_update_begin(&pstats->syncp);
1771 switch (proto) {
1772 case htons(ETH_P_IP):
1773 pstats->mstats.igmp_parse_errors++;
1774 break;
1775#if IS_ENABLED(CONFIG_IPV6)
1776 case htons(ETH_P_IPV6):
1777 pstats->mstats.mld_parse_errors++;
1778 break;
1779#endif
1780 }
1781 u64_stats_update_end(&pstats->syncp);
1782}
1783
91b02d3d
NA		 1784static void br_multicast_pim(struct net_bridge *br,
1785 struct net_bridge_port *port,
1786 const struct sk_buff *skb)
1787{
1788 unsigned int offset = skb_transport_offset(skb);
1789 struct pimhdr *pimhdr, _pimhdr;
1790
1791 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1792 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1793 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1794 return;
1795
1796 br_multicast_mark_router(br, port);
1797}
1798
eb1d1641
HX		 1799static int br_multicast_ipv4_rcv(struct net_bridge *br,
1800 struct net_bridge_port *port,
06499098
VY		 1801 struct sk_buff *skb,
1802 u16 vid)
eb1d1641 1803{
9afd85c9 1804 struct sk_buff *skb_trimmed = NULL;
6db6f0ea 1805 const unsigned char *src;
eb1d1641 1806 struct igmphdr *ih;
eb1d1641
HX		 1807 int err;
1808
9afd85c9 1809 err = ip_mc_check_igmp(skb, &skb_trimmed);
eb1d1641 1810
9afd85c9 1811 if (err == -ENOMSG) {
91b02d3d 1812 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
bd4265fe 1813 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
91b02d3d
NA		 1814 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1815 if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1816 br_multicast_pim(br, port, skb);
1817 }
eb1d1641 1818 return 0;
9afd85c9 1819 } else if (err < 0) {
1080ab95 1820 br_multicast_err_count(br, port, skb->protocol);
9afd85c9 1821 return err;
bd4265fe 1822 }
eb1d1641 1823
9afd85c9 1824 ih = igmp_hdr(skb);
6db6f0ea 1825 src = eth_hdr(skb)->h_source;
1080ab95 1826 BR_INPUT_SKB_CB(skb)->igmp = ih->type;
eb1d1641
HX		 1827
1828 switch (ih->type) {
1829 case IGMP_HOST_MEMBERSHIP_REPORT:
1830 case IGMPV2_HOST_MEMBERSHIP_REPORT:
62b2bcb4 1831 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
6db6f0ea 1832 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
eb1d1641
HX		 1833 break;
1834 case IGMPV3_HOST_MEMBERSHIP_REPORT:
9afd85c9 1835 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
eb1d1641
HX		 1836 break;
1837 case IGMP_HOST_MEMBERSHIP_QUERY:
9c2e955c 1838 br_ip4_multicast_query(br, port, skb_trimmed, vid);
eb1d1641
HX		 1839 break;
1840 case IGMP_HOST_LEAVE_MESSAGE:
6db6f0ea 1841 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
eb1d1641
HX		 1842 break;
1843 }
1844
a516993f 1845 if (skb_trimmed && skb_trimmed != skb)
9afd85c9
LL		 1846 kfree_skb(skb_trimmed);
1847
a65056ec 1848 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1080ab95
NA		 1849 BR_MCAST_DIR_RX);
1850
eb1d1641
HX		 1851 return err;
1852}
1853
dfd56b8b 1854#if IS_ENABLED(CONFIG_IPV6)
08b202b6
YH		 1855static int br_multicast_ipv6_rcv(struct net_bridge *br,
1856 struct net_bridge_port *port,
06499098
VY		 1857 struct sk_buff *skb,
1858 u16 vid)
08b202b6 1859{
9afd85c9 1860 struct sk_buff *skb_trimmed = NULL;
6db6f0ea 1861 const unsigned char *src;
9afd85c9 1862 struct mld_msg *mld;
08b202b6
YH		 1863 int err;
1864
9afd85c9 1865 err = ipv6_mc_check_mld(skb, &skb_trimmed);
08b202b6 1866
9afd85c9
LL		 1867 if (err == -ENOMSG) {
1868 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1869 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
08b202b6 1870 return 0;
9afd85c9 1871 } else if (err < 0) {
1080ab95 1872 br_multicast_err_count(br, port, skb->protocol);
9afd85c9 1873 return err;
08b202b6
YH		 1874 }
1875
9afd85c9 1876 mld = (struct mld_msg *)skb_transport_header(skb);
1080ab95 1877 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
08b202b6 1878
9afd85c9 1879 switch (mld->mld_type) {
08b202b6 1880 case ICMPV6_MGM_REPORT:
6db6f0ea 1881 src = eth_hdr(skb)->h_source;
fc2af6c7 1882 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
6db6f0ea
FF		 1883 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
1884 src);
08b202b6 1885 break;
08b202b6 1886 case ICMPV6_MLD2_REPORT:
9afd85c9 1887 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
08b202b6
YH		 1888 break;
1889 case ICMPV6_MGM_QUERY:
9afd85c9 1890 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
08b202b6
YH		 1891 break;
1892 case ICMPV6_MGM_REDUCTION:
6db6f0ea
FF		 1893 src = eth_hdr(skb)->h_source;
1894 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
9afd85c9 1895 break;
08b202b6
YH		 1896 }
1897
a516993f 1898 if (skb_trimmed && skb_trimmed != skb)
9afd85c9
LL		 1899 kfree_skb(skb_trimmed);
1900
a65056ec 1901 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1080ab95
NA		 1902 BR_MCAST_DIR_RX);
1903
08b202b6
YH		 1904 return err;
1905}
1906#endif
1907
eb1d1641 1908int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
06499098 1909 struct sk_buff *skb, u16 vid)
eb1d1641 1910{
1080ab95
NA		 1911 int ret = 0;
1912
1fafc7a9
YH		 1913 BR_INPUT_SKB_CB(skb)->igmp = 0;
1914 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1915
13cefad2 1916 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
eb1d1641
HX		 1917 return 0;
1918
1919 switch (skb->protocol) {
1920 case htons(ETH_P_IP):
1080ab95
NA		 1921 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1922 break;
dfd56b8b 1923#if IS_ENABLED(CONFIG_IPV6)
08b202b6 1924 case htons(ETH_P_IPV6):
1080ab95
NA		 1925 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1926 break;
08b202b6 1927#endif
eb1d1641
HX		 1928 }
1929
1080ab95 1930 return ret;
eb1d1641
HX		 1931}
1932
cc0fdd80 1933static void br_multicast_query_expired(struct net_bridge *br,
2cd41431
LL		 1934 struct bridge_mcast_own_query *query,
1935 struct bridge_mcast_querier *querier)
cc0fdd80
LL		 1936{
1937 spin_lock(&br->multicast_lock);
1938 if (query->startup_sent < br->multicast_startup_query_count)
1939 query->startup_sent++;
1940
71d9f614 1941 RCU_INIT_POINTER(querier->port, NULL);
cc0fdd80
LL		 1942 br_multicast_send_query(br, NULL, query);
1943 spin_unlock(&br->multicast_lock);
1944}
1945
88c1f37f 1946static void br_ip4_multicast_query_expired(struct timer_list *t)
eb1d1641 1947{
88c1f37f 1948 struct net_bridge *br = from_timer(br, t, ip4_own_query.timer);
eb1d1641 1949
2cd41431 1950 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
cc0fdd80 1951}
eb1d1641 1952
cc0fdd80 1953#if IS_ENABLED(CONFIG_IPV6)
88c1f37f 1954static void br_ip6_multicast_query_expired(struct timer_list *t)
cc0fdd80 1955{
88c1f37f 1956 struct net_bridge *br = from_timer(br, t, ip6_own_query.timer);
eb1d1641 1957
2cd41431 1958 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
eb1d1641 1959}
cc0fdd80 1960#endif
eb1d1641
HX		 1961
1962void br_multicast_init(struct net_bridge *br)
1963{
1964 br->hash_elasticity = 4;
1965 br->hash_max = 512;
1966
7f0aec7a 1967 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
eb1d1641
HX		 1968 br->multicast_last_member_count = 2;
1969 br->multicast_startup_query_count = 2;
1970
1971 br->multicast_last_member_interval = HZ;
1972 br->multicast_query_response_interval = 10 * HZ;
1973 br->multicast_startup_query_interval = 125 * HZ / 4;
1974 br->multicast_query_interval = 125 * HZ;
1975 br->multicast_querier_interval = 255 * HZ;
1976 br->multicast_membership_interval = 260 * HZ;
1977
90010b36 1978 br->ip4_other_query.delay_time = 0;
2cd41431 1979 br->ip4_querier.port = NULL;
aa2ae3e7 1980 br->multicast_igmp_version = 2;
cc0fdd80 1981#if IS_ENABLED(CONFIG_IPV6)
aa2ae3e7 1982 br->multicast_mld_version = 1;
90010b36 1983 br->ip6_other_query.delay_time = 0;
2cd41431 1984 br->ip6_querier.port = NULL;
cc0fdd80 1985#endif
6919622a 1986 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true);
675779ad 1987 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
b00589af 1988
eb1d1641 1989 spin_lock_init(&br->multicast_lock);
88c1f37f
AP		 1990 timer_setup(&br->multicast_router_timer,
1991 br_multicast_local_router_expired, 0);
1992 timer_setup(&br->ip4_other_query.timer,
1993 br_ip4_multicast_querier_expired, 0);
1994 timer_setup(&br->ip4_own_query.timer,
1995 br_ip4_multicast_query_expired, 0);
cc0fdd80 1996#if IS_ENABLED(CONFIG_IPV6)
88c1f37f
AP		 1997 timer_setup(&br->ip6_other_query.timer,
1998 br_ip6_multicast_querier_expired, 0);
1999 timer_setup(&br->ip6_own_query.timer,
2000 br_ip6_multicast_query_expired, 0);
cc0fdd80 2001#endif
eb1d1641
HX		 2002}
2003
cc0fdd80 2004static void __br_multicast_open(struct net_bridge *br,
90010b36 2005 struct bridge_mcast_own_query *query)
eb1d1641 2006{
cc0fdd80 2007 query->startup_sent = 0;
eb1d1641 2008
13cefad2 2009 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
eb1d1641
HX		 2010 return;
2011
cc0fdd80
LL		 2012 mod_timer(&query->timer, jiffies);
2013}
2014
2015void br_multicast_open(struct net_bridge *br)
2016{
90010b36 2017 __br_multicast_open(br, &br->ip4_own_query);
cc0fdd80 2018#if IS_ENABLED(CONFIG_IPV6)
90010b36 2019 __br_multicast_open(br, &br->ip6_own_query);
cc0fdd80 2020#endif
eb1d1641
HX		 2021}
2022
2023void br_multicast_stop(struct net_bridge *br)
2024{
eb1d1641 2025 del_timer_sync(&br->multicast_router_timer);
90010b36
LL		 2026 del_timer_sync(&br->ip4_other_query.timer);
2027 del_timer_sync(&br->ip4_own_query.timer);
cc0fdd80 2028#if IS_ENABLED(CONFIG_IPV6)
90010b36
LL		 2029 del_timer_sync(&br->ip6_other_query.timer);
2030 del_timer_sync(&br->ip6_own_query.timer);
cc0fdd80 2031#endif
e10177ab
SA		 2032}
2033
2034void br_multicast_dev_del(struct net_bridge *br)
2035{
2036 struct net_bridge_mdb_htable *mdb;
2037 struct net_bridge_mdb_entry *mp;
2038 struct hlist_node *n;
2039 u32 ver;
2040 int i;
eb1d1641
HX		 2041
2042 spin_lock_bh(&br->multicast_lock);
e8051688 2043 mdb = mlock_dereference(br->mdb, br);
eb1d1641
HX		 2044 if (!mdb)
2045 goto out;
2046
2047 br->mdb = NULL;
2048
2049 ver = mdb->ver;
2050 for (i = 0; i < mdb->max; i++) {
b67bfe0d 2051 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
eb1d1641
HX		 2052 hlist[ver]) {
2053 del_timer(&mp->timer);
eb1d1641
HX		 2054 call_rcu_bh(&mp->rcu, br_multicast_free_group);
2055 }
2056 }
2057
2058 if (mdb->old) {
2059 spin_unlock_bh(&br->multicast_lock);
10cc2b50 2060 rcu_barrier_bh();
eb1d1641
HX		 2061 spin_lock_bh(&br->multicast_lock);
2062 WARN_ON(mdb->old);
2063 }
2064
2065 mdb->old = mdb;
2066 call_rcu_bh(&mdb->rcu, br_mdb_free);
2067
2068out:
2069 spin_unlock_bh(&br->multicast_lock);
2070}
0909e117
HX		 2071
2072int br_multicast_set_router(struct net_bridge *br, unsigned long val)
2073{
6ae4ae8e 2074 int err = -EINVAL;
0909e117
HX		 2075
2076 spin_lock_bh(&br->multicast_lock);
0909e117
HX		 2077
2078 switch (val) {
7f0aec7a
NA		 2079 case MDB_RTR_TYPE_DISABLED:
2080 case MDB_RTR_TYPE_PERM:
77041420 2081 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM);
0909e117 2082 del_timer(&br->multicast_router_timer);
77041420
YG		 2083 br->multicast_router = val;
2084 err = 0;
2085 break;
7f0aec7a 2086 case MDB_RTR_TYPE_TEMP_QUERY:
77041420
YG		 2087 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
2088 br_mc_router_state_change(br, false);
0909e117
HX		 2089 br->multicast_router = val;
2090 err = 0;
2091 break;
0909e117
HX		 2092 }
2093
0909e117
HX		 2094 spin_unlock_bh(&br->multicast_lock);
2095
2096 return err;
2097}
2098
7f0aec7a
NA		 2099static void __del_port_router(struct net_bridge_port *p)
2100{
2101 if (hlist_unhashed(&p->rlist))
2102 return;
2103 hlist_del_init_rcu(&p->rlist);
2104 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
6d549648 2105 br_port_mc_router_state_change(p, false);
f12e7d95
NF		 2106
2107 /* don't allow timer refresh */
2108 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2109 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
7f0aec7a
NA		 2110}
2111
0909e117
HX		 2112int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
2113{
2114 struct net_bridge *br = p->br;
a55d8246 2115 unsigned long now = jiffies;
6ae4ae8e 2116 int err = -EINVAL;
0909e117
HX		 2117
2118 spin_lock(&br->multicast_lock);
4950cfd1 2119 if (p->multicast_router == val) {
a55d8246
NA		 2120 /* Refresh the temp router port timer */
2121 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2122 mod_timer(&p->multicast_router_timer,
2123 now + br->multicast_querier_interval);
4950cfd1
NA		 2124 err = 0;
2125 goto unlock;
2126 }
0909e117 2127 switch (val) {
7f0aec7a
NA		 2128 case MDB_RTR_TYPE_DISABLED:
2129 p->multicast_router = MDB_RTR_TYPE_DISABLED;
2130 __del_port_router(p);
2131 del_timer(&p->multicast_router_timer);
2132 break;
2133 case MDB_RTR_TYPE_TEMP_QUERY:
2134 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2135 __del_port_router(p);
2136 break;
2137 case MDB_RTR_TYPE_PERM:
2138 p->multicast_router = MDB_RTR_TYPE_PERM;
0909e117 2139 del_timer(&p->multicast_router_timer);
0909e117
HX		 2140 br_multicast_add_router(br, p);
2141 break;
a55d8246
NA		 2142 case MDB_RTR_TYPE_TEMP:
2143 p->multicast_router = MDB_RTR_TYPE_TEMP;
2144 br_multicast_mark_router(br, p);
2145 break;
7f0aec7a
NA		 2146 default:
2147 goto unlock;
0909e117 2148 }
7f0aec7a
NA		 2149 err = 0;
2150unlock:
0909e117
HX		 2151 spin_unlock(&br->multicast_lock);
2152
2153 return err;
2154}
561f1103 2155
cc0fdd80 2156static void br_multicast_start_querier(struct net_bridge *br,
90010b36 2157 struct bridge_mcast_own_query *query)
561f1103
HX		 2158{
2159 struct net_bridge_port *port;
74857216 2160
cc0fdd80 2161 __br_multicast_open(br, query);
74857216
HX		 2162
2163 list_for_each_entry(port, &br->port_list, list) {
2164 if (port->state == BR_STATE_DISABLED ||
2165 port->state == BR_STATE_BLOCKING)
2166 continue;
2167
90010b36
LL		 2168 if (query == &br->ip4_own_query)
2169 br_multicast_enable(&port->ip4_own_query);
cc0fdd80
LL		 2170#if IS_ENABLED(CONFIG_IPV6)
2171 else
90010b36 2172 br_multicast_enable(&port->ip6_own_query);
cc0fdd80 2173#endif
74857216
HX		 2174 }
2175}
2176
2177int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2178{
e8051688 2179 struct net_bridge_mdb_htable *mdb;
7cb3f921
NA		 2180 struct net_bridge_port *port;
2181 int err = 0;
561f1103 2182
ef5e0d82 2183 spin_lock_bh(&br->multicast_lock);
13cefad2 2184 if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val)
561f1103
HX		 2185 goto unlock;
2186
13cefad2
NA		 2187 br_mc_disabled_update(br->dev, val);
2188 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val);
2189 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
561f1103
HX		 2190 goto unlock;
2191
3a7fda06
HX		 2192 if (!netif_running(br->dev))
2193 goto unlock;
2194
e8051688
ED		 2195 mdb = mlock_dereference(br->mdb, br);
2196 if (mdb) {
2197 if (mdb->old) {
561f1103
HX		 2198 err = -EEXIST;
2199rollback:
13cefad2 2200 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false);
561f1103
HX		 2201 goto unlock;
2202 }
2203
e8051688 2204 err = br_mdb_rehash(&br->mdb, mdb->max,
561f1103
HX		 2205 br->hash_elasticity);
2206 if (err)
2207 goto rollback;
2208 }
2209
7cb3f921
NA		 2210 br_multicast_open(br);
2211 list_for_each_entry(port, &br->port_list, list)
2212 __br_multicast_enable_port(port);
561f1103
HX		 2213
2214unlock:
ef5e0d82 2215 spin_unlock_bh(&br->multicast_lock);
561f1103
HX		 2216
2217 return err;
2218}
b195167f 2219
9341b988
IS		 2220bool br_multicast_enabled(const struct net_device *dev)
2221{
2222 struct net_bridge *br = netdev_priv(dev);
2223
13cefad2 2224 return !!br_opt_get(br, BROPT_MULTICAST_ENABLED);
9341b988
IS		 2225}
2226EXPORT_SYMBOL_GPL(br_multicast_enabled);
2227
0912bda4
YG		 2228bool br_multicast_router(const struct net_device *dev)
2229{
2230 struct net_bridge *br = netdev_priv(dev);
2231 bool is_router;
2232
2233 spin_lock_bh(&br->multicast_lock);
2234 is_router = br_multicast_is_router(br);
2235 spin_unlock_bh(&br->multicast_lock);
2236 return is_router;
2237}
2238EXPORT_SYMBOL_GPL(br_multicast_router);
2239
c5c23260
HX		 2240int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2241{
b00589af
LL		 2242 unsigned long max_delay;
2243
c5c23260
HX		 2244 val = !!val;
2245
2246 spin_lock_bh(&br->multicast_lock);
675779ad 2247 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val)
c5c23260
HX		 2248 goto unlock;
2249
675779ad 2250 br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val);
b00589af
LL		 2251 if (!val)
2252 goto unlock;
2253
2254 max_delay = br->multicast_query_response_interval;
b00589af 2255
90010b36
LL		 2256 if (!timer_pending(&br->ip4_other_query.timer))
2257 br->ip4_other_query.delay_time = jiffies + max_delay;
cc0fdd80 2258
90010b36 2259 br_multicast_start_querier(br, &br->ip4_own_query);
cc0fdd80
LL		 2260
2261#if IS_ENABLED(CONFIG_IPV6)
90010b36
LL		 2262 if (!timer_pending(&br->ip6_other_query.timer))
2263 br->ip6_other_query.delay_time = jiffies + max_delay;
cc0fdd80 2264
90010b36 2265 br_multicast_start_querier(br, &br->ip6_own_query);
cc0fdd80 2266#endif
c5c23260
HX		 2267
2268unlock:
2269 spin_unlock_bh(&br->multicast_lock);
2270
2271 return 0;
2272}
2273
b195167f
HX		 2274int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2275{
6ae4ae8e 2276 int err = -EINVAL;
b195167f 2277 u32 old;
e8051688 2278 struct net_bridge_mdb_htable *mdb;
b195167f 2279
fe0d692b 2280 spin_lock_bh(&br->multicast_lock);
b195167f
HX		 2281 if (!is_power_of_2(val))
2282 goto unlock;
e8051688
ED		 2283
2284 mdb = mlock_dereference(br->mdb, br);
2285 if (mdb && val < mdb->size)
b195167f
HX		 2286 goto unlock;
2287
2288 err = 0;
2289
2290 old = br->hash_max;
2291 br->hash_max = val;
2292
e8051688
ED		 2293 if (mdb) {
2294 if (mdb->old) {
b195167f
HX		 2295 err = -EEXIST;
2296rollback:
2297 br->hash_max = old;
2298 goto unlock;
2299 }
2300
2301 err = br_mdb_rehash(&br->mdb, br->hash_max,
2302 br->hash_elasticity);
2303 if (err)
2304 goto rollback;
2305 }
2306
2307unlock:
fe0d692b 2308 spin_unlock_bh(&br->multicast_lock);
b195167f
HX		 2309
2310 return err;
2311}
07f8ac4a 2312
5e923585
NA		 2313int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2314{
2315 /* Currently we support only version 2 and 3 */
2316 switch (val) {
2317 case 2:
2318 case 3:
2319 break;
2320 default:
2321 return -EINVAL;
2322 }
2323
2324 spin_lock_bh(&br->multicast_lock);
2325 br->multicast_igmp_version = val;
2326 spin_unlock_bh(&br->multicast_lock);
2327
2328 return 0;
2329}
2330
aa2ae3e7
NA		 2331#if IS_ENABLED(CONFIG_IPV6)
2332int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2333{
2334 /* Currently we support version 1 and 2 */
2335 switch (val) {
2336 case 1:
2337 case 2:
2338 break;
2339 default:
2340 return -EINVAL;
2341 }
2342
2343 spin_lock_bh(&br->multicast_lock);
2344 br->multicast_mld_version = val;
2345 spin_unlock_bh(&br->multicast_lock);
2346
2347 return 0;
2348}
2349#endif
2350
07f8ac4a
LL		 2351/**
2352 * br_multicast_list_adjacent - Returns snooped multicast addresses
2353 * @dev: The bridge port adjacent to which to retrieve addresses
2354 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2355 *
2356 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2357 * snooping feature on all bridge ports of dev's bridge device, excluding
2358 * the addresses from dev itself.
2359 *
2360 * Returns the number of items added to br_ip_list.
2361 *
2362 * Notes:
2363 * - br_ip_list needs to be initialized by caller
2364 * - br_ip_list might contain duplicates in the end
2365 * (needs to be taken care of by caller)
2366 * - br_ip_list needs to be freed by caller
2367 */
2368int br_multicast_list_adjacent(struct net_device *dev,
2369 struct list_head *br_ip_list)
2370{
2371 struct net_bridge *br;
2372 struct net_bridge_port *port;
2373 struct net_bridge_port_group *group;
2374 struct br_ip_list *entry;
2375 int count = 0;
2376
2377 rcu_read_lock();
2378 if (!br_ip_list || !br_port_exists(dev))
2379 goto unlock;
2380
2381 port = br_port_get_rcu(dev);
2382 if (!port || !port->br)
2383 goto unlock;
2384
2385 br = port->br;
2386
2387 list_for_each_entry_rcu(port, &br->port_list, list) {
2388 if (!port->dev || port->dev == dev)
2389 continue;
2390
2391 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2392 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2393 if (!entry)
2394 goto unlock;
2395
2396 entry->addr = group->addr;
2397 list_add(&entry->list, br_ip_list);
2398 count++;
2399 }
2400 }
2401
2402unlock:
2403 rcu_read_unlock();
2404 return count;
2405}
2406EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2cd41431 2407
c34963e2
LL		 2408/**
2409 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2410 * @dev: The bridge port providing the bridge on which to check for a querier
2411 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2412 *
2413 * Checks whether the given interface has a bridge on top and if so returns
2414 * true if a valid querier exists anywhere on the bridged link layer.
2415 * Otherwise returns false.
2416 */
2417bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2418{
2419 struct net_bridge *br;
2420 struct net_bridge_port *port;
2421 struct ethhdr eth;
2422 bool ret = false;
2423
2424 rcu_read_lock();
2425 if (!br_port_exists(dev))
2426 goto unlock;
2427
2428 port = br_port_get_rcu(dev);
2429 if (!port || !port->br)
2430 goto unlock;
2431
2432 br = port->br;
2433
2434 memset(&eth, 0, sizeof(eth));
2435 eth.h_proto = htons(proto);
2436
2437 ret = br_multicast_querier_exists(br, &eth);
2438
2439unlock:
2440 rcu_read_unlock();
2441 return ret;
2442}
2443EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2444
2cd41431
LL		 2445/**
2446 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2447 * @dev: The bridge port adjacent to which to check for a querier
2448 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2449 *
2450 * Checks whether the given interface has a bridge on top and if so returns
2451 * true if a selected querier is behind one of the other ports of this
2452 * bridge. Otherwise returns false.
2453 */
2454bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2455{
2456 struct net_bridge *br;
2457 struct net_bridge_port *port;
2458 bool ret = false;
2459
2460 rcu_read_lock();
2461 if (!br_port_exists(dev))
2462 goto unlock;
2463
2464 port = br_port_get_rcu(dev);
2465 if (!port || !port->br)
2466 goto unlock;
2467
2468 br = port->br;
2469
2470 switch (proto) {
2471 case ETH_P_IP:
2472 if (!timer_pending(&br->ip4_other_query.timer) ||
2473 rcu_dereference(br->ip4_querier.port) == port)
2474 goto unlock;
2475 break;
3993c4e1 2476#if IS_ENABLED(CONFIG_IPV6)
2cd41431
LL		 2477 case ETH_P_IPV6:
2478 if (!timer_pending(&br->ip6_other_query.timer) ||
2479 rcu_dereference(br->ip6_querier.port) == port)
2480 goto unlock;
2481 break;
3993c4e1 2482#endif
2cd41431
LL		 2483 default:
2484 goto unlock;
2485 }
2486
2487 ret = true;
2488unlock:
2489 rcu_read_unlock();
2490 return ret;
2491}
2492EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
1080ab95
NA		 2493
2494static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
a65056ec 2495 const struct sk_buff *skb, u8 type, u8 dir)
1080ab95
NA		 2496{
2497 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
a65056ec
NA		 2498 __be16 proto = skb->protocol;
2499 unsigned int t_len;
1080ab95
NA		 2500
2501 u64_stats_update_begin(&pstats->syncp);
2502 switch (proto) {
2503 case htons(ETH_P_IP):
a65056ec 2504 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
1080ab95
NA		 2505 switch (type) {
2506 case IGMP_HOST_MEMBERSHIP_REPORT:
2507 pstats->mstats.igmp_v1reports[dir]++;
2508 break;
2509 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2510 pstats->mstats.igmp_v2reports[dir]++;
2511 break;
2512 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2513 pstats->mstats.igmp_v3reports[dir]++;
2514 break;
2515 case IGMP_HOST_MEMBERSHIP_QUERY:
a65056ec
NA		 2516 if (t_len != sizeof(struct igmphdr)) {
2517 pstats->mstats.igmp_v3queries[dir]++;
2518 } else {
2519 unsigned int offset = skb_transport_offset(skb);
2520 struct igmphdr *ih, _ihdr;
2521
2522 ih = skb_header_pointer(skb, offset,
2523 sizeof(_ihdr), &_ihdr);
2524 if (!ih)
2525 break;
2526 if (!ih->code)
2527 pstats->mstats.igmp_v1queries[dir]++;
2528 else
2529 pstats->mstats.igmp_v2queries[dir]++;
2530 }
1080ab95
NA		 2531 break;
2532 case IGMP_HOST_LEAVE_MESSAGE:
2533 pstats->mstats.igmp_leaves[dir]++;
2534 break;
2535 }
2536 break;
2537#if IS_ENABLED(CONFIG_IPV6)
2538 case htons(ETH_P_IPV6):
a65056ec
NA		 2539 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2540 sizeof(struct ipv6hdr);
2541 t_len -= skb_network_header_len(skb);
1080ab95
NA		 2542 switch (type) {
2543 case ICMPV6_MGM_REPORT:
2544 pstats->mstats.mld_v1reports[dir]++;
2545 break;
2546 case ICMPV6_MLD2_REPORT:
2547 pstats->mstats.mld_v2reports[dir]++;
2548 break;
2549 case ICMPV6_MGM_QUERY:
a65056ec
NA		 2550 if (t_len != sizeof(struct mld_msg))
2551 pstats->mstats.mld_v2queries[dir]++;
2552 else
2553 pstats->mstats.mld_v1queries[dir]++;
1080ab95
NA		 2554 break;
2555 case ICMPV6_MGM_REDUCTION:
2556 pstats->mstats.mld_leaves[dir]++;
2557 break;
2558 }
2559 break;
2560#endif /* CONFIG_IPV6 */
2561 }
2562 u64_stats_update_end(&pstats->syncp);
2563}
2564
2565void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
a65056ec 2566 const struct sk_buff *skb, u8 type, u8 dir)
1080ab95
NA		 2567{
2568 struct bridge_mcast_stats __percpu *stats;
2569
2570 /* if multicast_disabled is true then igmp type can't be set */
675779ad 2571 if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
1080ab95
NA		 2572 return;
2573
2574 if (p)
2575 stats = p->mcast_stats;
2576 else
2577 stats = br->mcast_stats;
2578 if (WARN_ON(!stats))
2579 return;
2580
a65056ec 2581 br_mcast_stats_add(stats, skb, type, dir);
1080ab95
NA		 2582}
2583
2584int br_multicast_init_stats(struct net_bridge *br)
2585{
2586 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2587 if (!br->mcast_stats)
2588 return -ENOMEM;
2589
2590 return 0;
2591}
2592
b6fe0440
IS		 2593void br_multicast_uninit_stats(struct net_bridge *br)
2594{
2595 free_percpu(br->mcast_stats);
2596}
2597
1080ab95
NA		 2598static void mcast_stats_add_dir(u64 *dst, u64 *src)
2599{
2600 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2601 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2602}
2603
2604void br_multicast_get_stats(const struct net_bridge *br,
2605 const struct net_bridge_port *p,
2606 struct br_mcast_stats *dest)
2607{
2608 struct bridge_mcast_stats __percpu *stats;
2609 struct br_mcast_stats tdst;
2610 int i;
2611
2612 memset(dest, 0, sizeof(*dest));
2613 if (p)
2614 stats = p->mcast_stats;
2615 else
2616 stats = br->mcast_stats;
2617 if (WARN_ON(!stats))
2618 return;
2619
2620 memset(&tdst, 0, sizeof(tdst));
2621 for_each_possible_cpu(i) {
2622 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2623 struct br_mcast_stats temp;
2624 unsigned int start;
2625
2626 do {
2627 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2628 memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2629 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2630
a65056ec
NA		 2631 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2632 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2633 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
1080ab95
NA		 2634 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2635 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2636 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2637 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2638 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2639
a65056ec
NA		 2640 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2641 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
1080ab95
NA		 2642 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2643 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2644 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2645 tdst.mld_parse_errors += temp.mld_parse_errors;
2646 }
2647 memcpy(dest, &tdst, sizeof(*dest));
2648}
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git