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Linux/net/bridge/br_multicast.c

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  1 /*
  2  * Bridge multicast support.
  3  *
  4  * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
  5  *
  6  * This program is free software; you can redistribute it and/or modify it
  7  * under the terms of the GNU General Public License as published by the Free
  8  * Software Foundation; either version 2 of the License, or (at your option)
  9  * any later version.
 10  *
 11  */
 12 
 13 #include <linux/err.h>
 14 #include <linux/export.h>
 15 #include <linux/if_ether.h>
 16 #include <linux/igmp.h>
 17 #include <linux/jhash.h>
 18 #include <linux/kernel.h>
 19 #include <linux/log2.h>
 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>
 27 #include <linux/inetdevice.h>
 28 #include <linux/mroute.h>
 29 #include <net/ip.h>
 30 #include <net/switchdev.h>
 31 #if IS_ENABLED(CONFIG_IPV6)
 32 #include <net/ipv6.h>
 33 #include <net/mld.h>
 34 #include <net/ip6_checksum.h>
 35 #include <net/addrconf.h>
 36 #endif
 37 
 38 #include "br_private.h"
 39 
 40 static void br_multicast_start_querier(struct net_bridge *br,
 41                                        struct bridge_mcast_own_query *query);
 42 static void br_multicast_add_router(struct net_bridge *br,
 43                                     struct net_bridge_port *port);
 44 static void br_ip4_multicast_leave_group(struct net_bridge *br,
 45                                          struct net_bridge_port *port,
 46                                          __be32 group,
 47                                          __u16 vid,
 48                                          const unsigned char *src);
 49 
 50 static void __del_port_router(struct net_bridge_port *p);
 51 #if IS_ENABLED(CONFIG_IPV6)
 52 static void br_ip6_multicast_leave_group(struct net_bridge *br,
 53                                          struct net_bridge_port *port,
 54                                          const struct in6_addr *group,
 55                                          __u16 vid, const unsigned char *src);
 56 #endif
 57 unsigned int br_mdb_rehash_seq;
 58 
 59 static 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;
 63         if (a->vid != b->vid)
 64                 return 0;
 65         switch (a->proto) {
 66         case htons(ETH_P_IP):
 67                 return a->u.ip4 == b->u.ip4;
 68 #if IS_ENABLED(CONFIG_IPV6)
 69         case htons(ETH_P_IPV6):
 70                 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
 71 #endif
 72         }
 73         return 0;
 74 }
 75 
 76 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
 77                                 __u16 vid)
 78 {
 79         return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
 80 }
 81 
 82 #if IS_ENABLED(CONFIG_IPV6)
 83 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
 84                                 const struct in6_addr *ip,
 85                                 __u16 vid)
 86 {
 87         return jhash_2words(ipv6_addr_hash(ip), vid,
 88                             mdb->secret) & (mdb->max - 1);
 89 }
 90 #endif
 91 
 92 static 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):
 97                 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
 98 #if IS_ENABLED(CONFIG_IPV6)
 99         case htons(ETH_P_IPV6):
100                 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
101 #endif
102         }
103         return 0;
104 }
105 
106 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
107         struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
108 {
109         struct net_bridge_mdb_entry *mp;
110 
111         hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
112                 if (br_ip_equal(&mp->addr, dst))
113                         return mp;
114         }
115 
116         return NULL;
117 }
118 
119 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
120                                            struct br_ip *dst)
121 {
122         if (!mdb)
123                 return NULL;
124 
125         return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
126 }
127 
128 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
129         struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
130 {
131         struct br_ip br_dst;
132 
133         br_dst.u.ip4 = dst;
134         br_dst.proto = htons(ETH_P_IP);
135         br_dst.vid = vid;
136 
137         return br_mdb_ip_get(mdb, &br_dst);
138 }
139 
140 #if IS_ENABLED(CONFIG_IPV6)
141 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
142         struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
143         __u16 vid)
144 {
145         struct br_ip br_dst;
146 
147         br_dst.u.ip6 = *dst;
148         br_dst.proto = htons(ETH_P_IPV6);
149         br_dst.vid = vid;
150 
151         return br_mdb_ip_get(mdb, &br_dst);
152 }
153 #endif
154 
155 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
156                                         struct sk_buff *skb, u16 vid)
157 {
158         struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
159         struct br_ip ip;
160 
161         if (br->multicast_disabled)
162                 return NULL;
163 
164         if (BR_INPUT_SKB_CB(skb)->igmp)
165                 return NULL;
166 
167         ip.proto = skb->protocol;
168         ip.vid = vid;
169 
170         switch (skb->protocol) {
171         case htons(ETH_P_IP):
172                 ip.u.ip4 = ip_hdr(skb)->daddr;
173                 break;
174 #if IS_ENABLED(CONFIG_IPV6)
175         case htons(ETH_P_IPV6):
176                 ip.u.ip6 = ipv6_hdr(skb)->daddr;
177                 break;
178 #endif
179         default:
180                 return NULL;
181         }
182 
183         return br_mdb_ip_get(mdb, &ip);
184 }
185 
186 static 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 
197 static 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;
202         int maxlen;
203         int len;
204         int i;
205 
206         for (i = 0; i < old->max; i++)
207                 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
208                         hlist_add_head(&mp->hlist[new->ver],
209                                        &new->mhash[br_ip_hash(new, &mp->addr)]);
210 
211         if (!elasticity)
212                 return 0;
213 
214         maxlen = 0;
215         for (i = 0; i < new->max; i++) {
216                 len = 0;
217                 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
218                         len++;
219                 if (len > maxlen)
220                         maxlen = len;
221         }
222 
223         return maxlen > elasticity ? -EINVAL : 0;
224 }
225 
226 void br_multicast_free_pg(struct rcu_head *head)
227 {
228         struct net_bridge_port_group *p =
229                 container_of(head, struct net_bridge_port_group, rcu);
230 
231         kfree(p);
232 }
233 
234 static 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 
242 static void br_multicast_group_expired(unsigned long data)
243 {
244         struct net_bridge_mdb_entry *mp = (void *)data;
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 
252         mp->mglist = false;
253 
254         if (mp->ports)
255                 goto out;
256 
257         mdb = mlock_dereference(br->mdb, br);
258 
259         hlist_del_rcu(&mp->hlist[mdb->ver]);
260         mdb->size--;
261 
262         call_rcu_bh(&mp->rcu, br_multicast_free_group);
263 
264 out:
265         spin_unlock(&br->multicast_lock);
266 }
267 
268 static void br_multicast_del_pg(struct net_bridge *br,
269                                 struct net_bridge_port_group *pg)
270 {
271         struct net_bridge_mdb_htable *mdb;
272         struct net_bridge_mdb_entry *mp;
273         struct net_bridge_port_group *p;
274         struct net_bridge_port_group __rcu **pp;
275 
276         mdb = mlock_dereference(br->mdb, br);
277 
278         mp = br_mdb_ip_get(mdb, &pg->addr);
279         if (WARN_ON(!mp))
280                 return;
281 
282         for (pp = &mp->ports;
283              (p = mlock_dereference(*pp, br)) != NULL;
284              pp = &p->next) {
285                 if (p != pg)
286                         continue;
287 
288                 rcu_assign_pointer(*pp, p->next);
289                 hlist_del_init(&p->mglist);
290                 del_timer(&p->timer);
291                 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
292                               p->flags);
293                 call_rcu_bh(&p->rcu, br_multicast_free_pg);
294 
295                 if (!mp->ports && !mp->mglist &&
296                     netif_running(br->dev))
297                         mod_timer(&mp->timer, jiffies);
298 
299                 return;
300         }
301 
302         WARN_ON(1);
303 }
304 
305 static void br_multicast_port_group_expired(unsigned long data)
306 {
307         struct net_bridge_port_group *pg = (void *)data;
308         struct net_bridge *br = pg->port->br;
309 
310         spin_lock(&br->multicast_lock);
311         if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
312             hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
313                 goto out;
314 
315         br_multicast_del_pg(br, pg);
316 
317 out:
318         spin_unlock(&br->multicast_lock);
319 }
320 
321 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
322                          int elasticity)
323 {
324         struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
325         struct net_bridge_mdb_htable *mdb;
326         int err;
327 
328         mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
329         if (!mdb)
330                 return -ENOMEM;
331 
332         mdb->max = max;
333         mdb->old = old;
334 
335         mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
336         if (!mdb->mhash) {
337                 kfree(mdb);
338                 return -ENOMEM;
339         }
340 
341         mdb->size = old ? old->size : 0;
342         mdb->ver = old ? old->ver ^ 1 : 0;
343 
344         if (!old || elasticity)
345                 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
346         else
347                 mdb->secret = old->secret;
348 
349         if (!old)
350                 goto out;
351 
352         err = br_mdb_copy(mdb, old, elasticity);
353         if (err) {
354                 kfree(mdb->mhash);
355                 kfree(mdb);
356                 return err;
357         }
358 
359         br_mdb_rehash_seq++;
360         call_rcu_bh(&mdb->rcu, br_mdb_free);
361 
362 out:
363         rcu_assign_pointer(*mdbp, mdb);
364 
365         return 0;
366 }
367 
368 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
369                                                     __be32 group,
370                                                     u8 *igmp_type)
371 {
372         struct igmpv3_query *ihv3;
373         size_t igmp_hdr_size;
374         struct sk_buff *skb;
375         struct igmphdr *ih;
376         struct ethhdr *eth;
377         struct iphdr *iph;
378 
379         igmp_hdr_size = sizeof(*ih);
380         if (br->multicast_igmp_version == 3)
381                 igmp_hdr_size = sizeof(*ihv3);
382         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
383                                                  igmp_hdr_size + 4);
384         if (!skb)
385                 goto out;
386 
387         skb->protocol = htons(ETH_P_IP);
388 
389         skb_reset_mac_header(skb);
390         eth = eth_hdr(skb);
391 
392         ether_addr_copy(eth->h_source, br->dev->dev_addr);
393         eth->h_dest[0] = 1;
394         eth->h_dest[1] = 0;
395         eth->h_dest[2] = 0x5e;
396         eth->h_dest[3] = 0;
397         eth->h_dest[4] = 0;
398         eth->h_dest[5] = 1;
399         eth->h_proto = htons(ETH_P_IP);
400         skb_put(skb, sizeof(*eth));
401 
402         skb_set_network_header(skb, skb->len);
403         iph = ip_hdr(skb);
404 
405         iph->version = 4;
406         iph->ihl = 6;
407         iph->tos = 0xc0;
408         iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4);
409         iph->id = 0;
410         iph->frag_off = htons(IP_DF);
411         iph->ttl = 1;
412         iph->protocol = IPPROTO_IGMP;
413         iph->saddr = br->multicast_query_use_ifaddr ?
414                      inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
415         iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
416         ((u8 *)&iph[1])[0] = IPOPT_RA;
417         ((u8 *)&iph[1])[1] = 4;
418         ((u8 *)&iph[1])[2] = 0;
419         ((u8 *)&iph[1])[3] = 0;
420         ip_send_check(iph);
421         skb_put(skb, 24);
422 
423         skb_set_transport_header(skb, skb->len);
424         *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
425 
426         switch (br->multicast_igmp_version) {
427         case 2:
428                 ih = igmp_hdr(skb);
429                 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
430                 ih->code = (group ? br->multicast_last_member_interval :
431                                     br->multicast_query_response_interval) /
432                            (HZ / IGMP_TIMER_SCALE);
433                 ih->group = group;
434                 ih->csum = 0;
435                 ih->csum = ip_compute_csum((void *)ih, sizeof(*ih));
436                 break;
437         case 3:
438                 ihv3 = igmpv3_query_hdr(skb);
439                 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
440                 ihv3->code = (group ? br->multicast_last_member_interval :
441                                       br->multicast_query_response_interval) /
442                              (HZ / IGMP_TIMER_SCALE);
443                 ihv3->group = group;
444                 ihv3->qqic = br->multicast_query_interval / HZ;
445                 ihv3->nsrcs = 0;
446                 ihv3->resv = 0;
447                 ihv3->suppress = 0;
448                 ihv3->qrv = 2;
449                 ihv3->csum = 0;
450                 ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3));
451                 break;
452         }
453 
454         skb_put(skb, igmp_hdr_size);
455         __skb_pull(skb, sizeof(*eth));
456 
457 out:
458         return skb;
459 }
460 
461 #if IS_ENABLED(CONFIG_IPV6)
462 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
463                                                     const struct in6_addr *grp,
464                                                     u8 *igmp_type)
465 {
466         struct mld2_query *mld2q;
467         unsigned long interval;
468         struct ipv6hdr *ip6h;
469         struct mld_msg *mldq;
470         size_t mld_hdr_size;
471         struct sk_buff *skb;
472         struct ethhdr *eth;
473         u8 *hopopt;
474 
475         mld_hdr_size = sizeof(*mldq);
476         if (br->multicast_mld_version == 2)
477                 mld_hdr_size = sizeof(*mld2q);
478         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
479                                                  8 + mld_hdr_size);
480         if (!skb)
481                 goto out;
482 
483         skb->protocol = htons(ETH_P_IPV6);
484 
485         /* Ethernet header */
486         skb_reset_mac_header(skb);
487         eth = eth_hdr(skb);
488 
489         ether_addr_copy(eth->h_source, br->dev->dev_addr);
490         eth->h_proto = htons(ETH_P_IPV6);
491         skb_put(skb, sizeof(*eth));
492 
493         /* IPv6 header + HbH option */
494         skb_set_network_header(skb, skb->len);
495         ip6h = ipv6_hdr(skb);
496 
497         *(__force __be32 *)ip6h = htonl(0x60000000);
498         ip6h->payload_len = htons(8 + mld_hdr_size);
499         ip6h->nexthdr = IPPROTO_HOPOPTS;
500         ip6h->hop_limit = 1;
501         ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
502         if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
503                                &ip6h->saddr)) {
504                 kfree_skb(skb);
505                 br->has_ipv6_addr = 0;
506                 return NULL;
507         }
508 
509         br->has_ipv6_addr = 1;
510         ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
511 
512         hopopt = (u8 *)(ip6h + 1);
513         hopopt[0] = IPPROTO_ICMPV6;             /* next hdr */
514         hopopt[1] = 0;                          /* length of HbH */
515         hopopt[2] = IPV6_TLV_ROUTERALERT;       /* Router Alert */
516         hopopt[3] = 2;                          /* Length of RA Option */
517         hopopt[4] = 0;                          /* Type = 0x0000 (MLD) */
518         hopopt[5] = 0;
519         hopopt[6] = IPV6_TLV_PAD1;              /* Pad1 */
520         hopopt[7] = IPV6_TLV_PAD1;              /* Pad1 */
521 
522         skb_put(skb, sizeof(*ip6h) + 8);
523 
524         /* ICMPv6 */
525         skb_set_transport_header(skb, skb->len);
526         interval = ipv6_addr_any(grp) ?
527                         br->multicast_query_response_interval :
528                         br->multicast_last_member_interval;
529         *igmp_type = ICMPV6_MGM_QUERY;
530         switch (br->multicast_mld_version) {
531         case 1:
532                 mldq = (struct mld_msg *)icmp6_hdr(skb);
533                 mldq->mld_type = ICMPV6_MGM_QUERY;
534                 mldq->mld_code = 0;
535                 mldq->mld_cksum = 0;
536                 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
537                 mldq->mld_reserved = 0;
538                 mldq->mld_mca = *grp;
539                 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
540                                                   sizeof(*mldq), IPPROTO_ICMPV6,
541                                                   csum_partial(mldq,
542                                                                sizeof(*mldq),
543                                                                0));
544                 break;
545         case 2:
546                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
547                 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
548                 mld2q->mld2q_type = ICMPV6_MGM_QUERY;
549                 mld2q->mld2q_code = 0;
550                 mld2q->mld2q_cksum = 0;
551                 mld2q->mld2q_resv1 = 0;
552                 mld2q->mld2q_resv2 = 0;
553                 mld2q->mld2q_suppress = 0;
554                 mld2q->mld2q_qrv = 2;
555                 mld2q->mld2q_nsrcs = 0;
556                 mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
557                 mld2q->mld2q_mca = *grp;
558                 mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
559                                                      sizeof(*mld2q),
560                                                      IPPROTO_ICMPV6,
561                                                      csum_partial(mld2q,
562                                                                   sizeof(*mld2q),
563                                                                   0));
564                 break;
565         }
566         skb_put(skb, mld_hdr_size);
567 
568         __skb_pull(skb, sizeof(*eth));
569 
570 out:
571         return skb;
572 }
573 #endif
574 
575 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
576                                                 struct br_ip *addr,
577                                                 u8 *igmp_type)
578 {
579         switch (addr->proto) {
580         case htons(ETH_P_IP):
581                 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
582 #if IS_ENABLED(CONFIG_IPV6)
583         case htons(ETH_P_IPV6):
584                 return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
585                                                     igmp_type);
586 #endif
587         }
588         return NULL;
589 }
590 
591 static struct net_bridge_mdb_entry *br_multicast_get_group(
592         struct net_bridge *br, struct net_bridge_port *port,
593         struct br_ip *group, int hash)
594 {
595         struct net_bridge_mdb_htable *mdb;
596         struct net_bridge_mdb_entry *mp;
597         unsigned int count = 0;
598         unsigned int max;
599         int elasticity;
600         int err;
601 
602         mdb = rcu_dereference_protected(br->mdb, 1);
603         hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
604                 count++;
605                 if (unlikely(br_ip_equal(group, &mp->addr)))
606                         return mp;
607         }
608 
609         elasticity = 0;
610         max = mdb->max;
611 
612         if (unlikely(count > br->hash_elasticity && count)) {
613                 if (net_ratelimit())
614                         br_info(br, "Multicast hash table "
615                                 "chain limit reached: %s\n",
616                                 port ? port->dev->name : br->dev->name);
617 
618                 elasticity = br->hash_elasticity;
619         }
620 
621         if (mdb->size >= max) {
622                 max *= 2;
623                 if (unlikely(max > br->hash_max)) {
624                         br_warn(br, "Multicast hash table maximum of %d "
625                                 "reached, disabling snooping: %s\n",
626                                 br->hash_max,
627                                 port ? port->dev->name : br->dev->name);
628                         err = -E2BIG;
629 disable:
630                         br->multicast_disabled = 1;
631                         goto err;
632                 }
633         }
634 
635         if (max > mdb->max || elasticity) {
636                 if (mdb->old) {
637                         if (net_ratelimit())
638                                 br_info(br, "Multicast hash table "
639                                         "on fire: %s\n",
640                                         port ? port->dev->name : br->dev->name);
641                         err = -EEXIST;
642                         goto err;
643                 }
644 
645                 err = br_mdb_rehash(&br->mdb, max, elasticity);
646                 if (err) {
647                         br_warn(br, "Cannot rehash multicast "
648                                 "hash table, disabling snooping: %s, %d, %d\n",
649                                 port ? port->dev->name : br->dev->name,
650                                 mdb->size, err);
651                         goto disable;
652                 }
653 
654                 err = -EAGAIN;
655                 goto err;
656         }
657 
658         return NULL;
659 
660 err:
661         mp = ERR_PTR(err);
662         return mp;
663 }
664 
665 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
666                                                     struct net_bridge_port *p,
667                                                     struct br_ip *group)
668 {
669         struct net_bridge_mdb_htable *mdb;
670         struct net_bridge_mdb_entry *mp;
671         int hash;
672         int err;
673 
674         mdb = rcu_dereference_protected(br->mdb, 1);
675         if (!mdb) {
676                 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
677                 if (err)
678                         return ERR_PTR(err);
679                 goto rehash;
680         }
681 
682         hash = br_ip_hash(mdb, group);
683         mp = br_multicast_get_group(br, p, group, hash);
684         switch (PTR_ERR(mp)) {
685         case 0:
686                 break;
687 
688         case -EAGAIN:
689 rehash:
690                 mdb = rcu_dereference_protected(br->mdb, 1);
691                 hash = br_ip_hash(mdb, group);
692                 break;
693 
694         default:
695                 goto out;
696         }
697 
698         mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
699         if (unlikely(!mp))
700                 return ERR_PTR(-ENOMEM);
701 
702         mp->br = br;
703         mp->addr = *group;
704         setup_timer(&mp->timer, br_multicast_group_expired,
705                     (unsigned long)mp);
706 
707         hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
708         mdb->size++;
709 
710 out:
711         return mp;
712 }
713 
714 struct net_bridge_port_group *br_multicast_new_port_group(
715                         struct net_bridge_port *port,
716                         struct br_ip *group,
717                         struct net_bridge_port_group __rcu *next,
718                         unsigned char flags,
719                         const unsigned char *src)
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;
729         p->flags = flags;
730         rcu_assign_pointer(p->next, next);
731         hlist_add_head(&p->mglist, &port->mglist);
732         setup_timer(&p->timer, br_multicast_port_group_expired,
733                     (unsigned long)p);
734 
735         if (src)
736                 memcpy(p->eth_addr, src, ETH_ALEN);
737         else
738                 memset(p->eth_addr, 0xff, ETH_ALEN);
739 
740         return p;
741 }
742 
743 static bool br_port_group_equal(struct net_bridge_port_group *p,
744                                 struct net_bridge_port *port,
745                                 const unsigned char *src)
746 {
747         if (p->port != port)
748                 return false;
749 
750         if (!(port->flags & BR_MULTICAST_TO_UNICAST))
751                 return true;
752 
753         return ether_addr_equal(src, p->eth_addr);
754 }
755 
756 static int br_multicast_add_group(struct net_bridge *br,
757                                   struct net_bridge_port *port,
758                                   struct br_ip *group,
759                                   const unsigned char *src)
760 {
761         struct net_bridge_port_group __rcu **pp;
762         struct net_bridge_port_group *p;
763         struct net_bridge_mdb_entry *mp;
764         unsigned long now = jiffies;
765         int err;
766 
767         spin_lock(&br->multicast_lock);
768         if (!netif_running(br->dev) ||
769             (port && port->state == BR_STATE_DISABLED))
770                 goto out;
771 
772         mp = br_multicast_new_group(br, port, group);
773         err = PTR_ERR(mp);
774         if (IS_ERR(mp))
775                 goto err;
776 
777         if (!port) {
778                 mp->mglist = true;
779                 mod_timer(&mp->timer, now + br->multicast_membership_interval);
780                 goto out;
781         }
782 
783         for (pp = &mp->ports;
784              (p = mlock_dereference(*pp, br)) != NULL;
785              pp = &p->next) {
786                 if (br_port_group_equal(p, port, src))
787                         goto found;
788                 if ((unsigned long)p->port < (unsigned long)port)
789                         break;
790         }
791 
792         p = br_multicast_new_port_group(port, group, *pp, 0, src);
793         if (unlikely(!p))
794                 goto err;
795         rcu_assign_pointer(*pp, p);
796         br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
797 
798 found:
799         mod_timer(&p->timer, now + br->multicast_membership_interval);
800 out:
801         err = 0;
802 
803 err:
804         spin_unlock(&br->multicast_lock);
805         return err;
806 }
807 
808 static int br_ip4_multicast_add_group(struct net_bridge *br,
809                                       struct net_bridge_port *port,
810                                       __be32 group,
811                                       __u16 vid,
812                                       const unsigned char *src)
813 {
814         struct br_ip br_group;
815 
816         if (ipv4_is_local_multicast(group))
817                 return 0;
818 
819         br_group.u.ip4 = group;
820         br_group.proto = htons(ETH_P_IP);
821         br_group.vid = vid;
822 
823         return br_multicast_add_group(br, port, &br_group, src);
824 }
825 
826 #if IS_ENABLED(CONFIG_IPV6)
827 static int br_ip6_multicast_add_group(struct net_bridge *br,
828                                       struct net_bridge_port *port,
829                                       const struct in6_addr *group,
830                                       __u16 vid,
831                                       const unsigned char *src)
832 {
833         struct br_ip br_group;
834 
835         if (ipv6_addr_is_ll_all_nodes(group))
836                 return 0;
837 
838         br_group.u.ip6 = *group;
839         br_group.proto = htons(ETH_P_IPV6);
840         br_group.vid = vid;
841 
842         return br_multicast_add_group(br, port, &br_group, src);
843 }
844 #endif
845 
846 static void br_multicast_router_expired(unsigned long data)
847 {
848         struct net_bridge_port *port = (void *)data;
849         struct net_bridge *br = port->br;
850 
851         spin_lock(&br->multicast_lock);
852         if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
853             port->multicast_router == MDB_RTR_TYPE_PERM ||
854             timer_pending(&port->multicast_router_timer))
855                 goto out;
856 
857         __del_port_router(port);
858 out:
859         spin_unlock(&br->multicast_lock);
860 }
861 
862 static void br_multicast_local_router_expired(unsigned long data)
863 {
864 }
865 
866 static void br_multicast_querier_expired(struct net_bridge *br,
867                                          struct bridge_mcast_own_query *query)
868 {
869         spin_lock(&br->multicast_lock);
870         if (!netif_running(br->dev) || br->multicast_disabled)
871                 goto out;
872 
873         br_multicast_start_querier(br, query);
874 
875 out:
876         spin_unlock(&br->multicast_lock);
877 }
878 
879 static void br_ip4_multicast_querier_expired(unsigned long data)
880 {
881         struct net_bridge *br = (void *)data;
882 
883         br_multicast_querier_expired(br, &br->ip4_own_query);
884 }
885 
886 #if IS_ENABLED(CONFIG_IPV6)
887 static void br_ip6_multicast_querier_expired(unsigned long data)
888 {
889         struct net_bridge *br = (void *)data;
890 
891         br_multicast_querier_expired(br, &br->ip6_own_query);
892 }
893 #endif
894 
895 static void br_multicast_select_own_querier(struct net_bridge *br,
896                                             struct br_ip *ip,
897                                             struct sk_buff *skb)
898 {
899         if (ip->proto == htons(ETH_P_IP))
900                 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
901 #if IS_ENABLED(CONFIG_IPV6)
902         else
903                 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
904 #endif
905 }
906 
907 static void __br_multicast_send_query(struct net_bridge *br,
908                                       struct net_bridge_port *port,
909                                       struct br_ip *ip)
910 {
911         struct sk_buff *skb;
912         u8 igmp_type;
913 
914         skb = br_multicast_alloc_query(br, ip, &igmp_type);
915         if (!skb)
916                 return;
917 
918         if (port) {
919                 skb->dev = port->dev;
920                 br_multicast_count(br, port, skb, igmp_type,
921                                    BR_MCAST_DIR_TX);
922                 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
923                         dev_net(port->dev), NULL, skb, NULL, skb->dev,
924                         br_dev_queue_push_xmit);
925         } else {
926                 br_multicast_select_own_querier(br, ip, skb);
927                 br_multicast_count(br, port, skb, igmp_type,
928                                    BR_MCAST_DIR_RX);
929                 netif_rx(skb);
930         }
931 }
932 
933 static void br_multicast_send_query(struct net_bridge *br,
934                                     struct net_bridge_port *port,
935                                     struct bridge_mcast_own_query *own_query)
936 {
937         struct bridge_mcast_other_query *other_query = NULL;
938         struct br_ip br_group;
939         unsigned long time;
940 
941         if (!netif_running(br->dev) || br->multicast_disabled ||
942             !br->multicast_querier)
943                 return;
944 
945         memset(&br_group.u, 0, sizeof(br_group.u));
946 
947         if (port ? (own_query == &port->ip4_own_query) :
948                    (own_query == &br->ip4_own_query)) {
949                 other_query = &br->ip4_other_query;
950                 br_group.proto = htons(ETH_P_IP);
951 #if IS_ENABLED(CONFIG_IPV6)
952         } else {
953                 other_query = &br->ip6_other_query;
954                 br_group.proto = htons(ETH_P_IPV6);
955 #endif
956         }
957 
958         if (!other_query || timer_pending(&other_query->timer))
959                 return;
960 
961         __br_multicast_send_query(br, port, &br_group);
962 
963         time = jiffies;
964         time += own_query->startup_sent < br->multicast_startup_query_count ?
965                 br->multicast_startup_query_interval :
966                 br->multicast_query_interval;
967         mod_timer(&own_query->timer, time);
968 }
969 
970 static void
971 br_multicast_port_query_expired(struct net_bridge_port *port,
972                                 struct bridge_mcast_own_query *query)
973 {
974         struct net_bridge *br = port->br;
975 
976         spin_lock(&br->multicast_lock);
977         if (port->state == BR_STATE_DISABLED ||
978             port->state == BR_STATE_BLOCKING)
979                 goto out;
980 
981         if (query->startup_sent < br->multicast_startup_query_count)
982                 query->startup_sent++;
983 
984         br_multicast_send_query(port->br, port, query);
985 
986 out:
987         spin_unlock(&br->multicast_lock);
988 }
989 
990 static void br_ip4_multicast_port_query_expired(unsigned long data)
991 {
992         struct net_bridge_port *port = (void *)data;
993 
994         br_multicast_port_query_expired(port, &port->ip4_own_query);
995 }
996 
997 #if IS_ENABLED(CONFIG_IPV6)
998 static void br_ip6_multicast_port_query_expired(unsigned long data)
999 {
1000         struct net_bridge_port *port = (void *)data;
1001 
1002         br_multicast_port_query_expired(port, &port->ip6_own_query);
1003 }
1004 #endif
1005 
1006 static void br_mc_disabled_update(struct net_device *dev, bool value)
1007 {
1008         struct switchdev_attr attr = {
1009                 .orig_dev = dev,
1010                 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
1011                 .flags = SWITCHDEV_F_DEFER,
1012                 .u.mc_disabled = value,
1013         };
1014 
1015         switchdev_port_attr_set(dev, &attr);
1016 }
1017 
1018 int br_multicast_add_port(struct net_bridge_port *port)
1019 {
1020         port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1021 
1022         setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
1023                     (unsigned long)port);
1024         setup_timer(&port->ip4_own_query.timer,
1025                     br_ip4_multicast_port_query_expired, (unsigned long)port);
1026 #if IS_ENABLED(CONFIG_IPV6)
1027         setup_timer(&port->ip6_own_query.timer,
1028                     br_ip6_multicast_port_query_expired, (unsigned long)port);
1029 #endif
1030         br_mc_disabled_update(port->dev, port->br->multicast_disabled);
1031 
1032         port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
1033         if (!port->mcast_stats)
1034                 return -ENOMEM;
1035 
1036         return 0;
1037 }
1038 
1039 void br_multicast_del_port(struct net_bridge_port *port)
1040 {
1041         struct net_bridge *br = port->br;
1042         struct net_bridge_port_group *pg;
1043         struct hlist_node *n;
1044 
1045         /* Take care of the remaining groups, only perm ones should be left */
1046         spin_lock_bh(&br->multicast_lock);
1047         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1048                 br_multicast_del_pg(br, pg);
1049         spin_unlock_bh(&br->multicast_lock);
1050         del_timer_sync(&port->multicast_router_timer);
1051         free_percpu(port->mcast_stats);
1052 }
1053 
1054 static void br_multicast_enable(struct bridge_mcast_own_query *query)
1055 {
1056         query->startup_sent = 0;
1057 
1058         if (try_to_del_timer_sync(&query->timer) >= 0 ||
1059             del_timer(&query->timer))
1060                 mod_timer(&query->timer, jiffies);
1061 }
1062 
1063 static void __br_multicast_enable_port(struct net_bridge_port *port)
1064 {
1065         struct net_bridge *br = port->br;
1066 
1067         if (br->multicast_disabled || !netif_running(br->dev))
1068                 return;
1069 
1070         br_multicast_enable(&port->ip4_own_query);
1071 #if IS_ENABLED(CONFIG_IPV6)
1072         br_multicast_enable(&port->ip6_own_query);
1073 #endif
1074         if (port->multicast_router == MDB_RTR_TYPE_PERM &&
1075             hlist_unhashed(&port->rlist))
1076                 br_multicast_add_router(br, port);
1077 }
1078 
1079 void br_multicast_enable_port(struct net_bridge_port *port)
1080 {
1081         struct net_bridge *br = port->br;
1082 
1083         spin_lock(&br->multicast_lock);
1084         __br_multicast_enable_port(port);
1085         spin_unlock(&br->multicast_lock);
1086 }
1087 
1088 void br_multicast_disable_port(struct net_bridge_port *port)
1089 {
1090         struct net_bridge *br = port->br;
1091         struct net_bridge_port_group *pg;
1092         struct hlist_node *n;
1093 
1094         spin_lock(&br->multicast_lock);
1095         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1096                 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
1097                         br_multicast_del_pg(br, pg);
1098 
1099         __del_port_router(port);
1100 
1101         del_timer(&port->multicast_router_timer);
1102         del_timer(&port->ip4_own_query.timer);
1103 #if IS_ENABLED(CONFIG_IPV6)
1104         del_timer(&port->ip6_own_query.timer);
1105 #endif
1106         spin_unlock(&br->multicast_lock);
1107 }
1108 
1109 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1110                                          struct net_bridge_port *port,
1111                                          struct sk_buff *skb,
1112                                          u16 vid)
1113 {
1114         const unsigned char *src;
1115         struct igmpv3_report *ih;
1116         struct igmpv3_grec *grec;
1117         int i;
1118         int len;
1119         int num;
1120         int type;
1121         int err = 0;
1122         __be32 group;
1123 
1124         ih = igmpv3_report_hdr(skb);
1125         num = ntohs(ih->ngrec);
1126         len = skb_transport_offset(skb) + sizeof(*ih);
1127 
1128         for (i = 0; i < num; i++) {
1129                 len += sizeof(*grec);
1130                 if (!pskb_may_pull(skb, len))
1131                         return -EINVAL;
1132 
1133                 grec = (void *)(skb->data + len - sizeof(*grec));
1134                 group = grec->grec_mca;
1135                 type = grec->grec_type;
1136 
1137                 len += ntohs(grec->grec_nsrcs) * 4;
1138                 if (!pskb_may_pull(skb, len))
1139                         return -EINVAL;
1140 
1141                 /* We treat this as an IGMPv2 report for now. */
1142                 switch (type) {
1143                 case IGMPV3_MODE_IS_INCLUDE:
1144                 case IGMPV3_MODE_IS_EXCLUDE:
1145                 case IGMPV3_CHANGE_TO_INCLUDE:
1146                 case IGMPV3_CHANGE_TO_EXCLUDE:
1147                 case IGMPV3_ALLOW_NEW_SOURCES:
1148                 case IGMPV3_BLOCK_OLD_SOURCES:
1149                         break;
1150 
1151                 default:
1152                         continue;
1153                 }
1154 
1155                 src = eth_hdr(skb)->h_source;
1156                 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1157                      type == IGMPV3_MODE_IS_INCLUDE) &&
1158                     ntohs(grec->grec_nsrcs) == 0) {
1159                         br_ip4_multicast_leave_group(br, port, group, vid, src);
1160                 } else {
1161                         err = br_ip4_multicast_add_group(br, port, group, vid,
1162                                                          src);
1163                         if (err)
1164                                 break;
1165                 }
1166         }
1167 
1168         return err;
1169 }
1170 
1171 #if IS_ENABLED(CONFIG_IPV6)
1172 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1173                                         struct net_bridge_port *port,
1174                                         struct sk_buff *skb,
1175                                         u16 vid)
1176 {
1177         const unsigned char *src;
1178         struct icmp6hdr *icmp6h;
1179         struct mld2_grec *grec;
1180         int i;
1181         int len;
1182         int num;
1183         int err = 0;
1184 
1185         if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1186                 return -EINVAL;
1187 
1188         icmp6h = icmp6_hdr(skb);
1189         num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1190         len = skb_transport_offset(skb) + sizeof(*icmp6h);
1191 
1192         for (i = 0; i < num; i++) {
1193                 __be16 *nsrcs, _nsrcs;
1194 
1195                 nsrcs = skb_header_pointer(skb,
1196                                            len + offsetof(struct mld2_grec,
1197                                                           grec_nsrcs),
1198                                            sizeof(_nsrcs), &_nsrcs);
1199                 if (!nsrcs)
1200                         return -EINVAL;
1201 
1202                 if (!pskb_may_pull(skb,
1203                                    len + sizeof(*grec) +
1204                                    sizeof(struct in6_addr) * ntohs(*nsrcs)))
1205                         return -EINVAL;
1206 
1207                 grec = (struct mld2_grec *)(skb->data + len);
1208                 len += sizeof(*grec) +
1209                        sizeof(struct in6_addr) * ntohs(*nsrcs);
1210 
1211                 /* We treat these as MLDv1 reports for now. */
1212                 switch (grec->grec_type) {
1213                 case MLD2_MODE_IS_INCLUDE:
1214                 case MLD2_MODE_IS_EXCLUDE:
1215                 case MLD2_CHANGE_TO_INCLUDE:
1216                 case MLD2_CHANGE_TO_EXCLUDE:
1217                 case MLD2_ALLOW_NEW_SOURCES:
1218                 case MLD2_BLOCK_OLD_SOURCES:
1219                         break;
1220 
1221                 default:
1222                         continue;
1223                 }
1224 
1225                 src = eth_hdr(skb)->h_source;
1226                 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1227                      grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1228                     ntohs(*nsrcs) == 0) {
1229                         br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1230                                                      vid, src);
1231                 } else {
1232                         err = br_ip6_multicast_add_group(br, port,
1233                                                          &grec->grec_mca, vid,
1234                                                          src);
1235                         if (err)
1236                                 break;
1237                 }
1238         }
1239 
1240         return err;
1241 }
1242 #endif
1243 
1244 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1245                                             struct net_bridge_port *port,
1246                                             __be32 saddr)
1247 {
1248         if (!timer_pending(&br->ip4_own_query.timer) &&
1249             !timer_pending(&br->ip4_other_query.timer))
1250                 goto update;
1251 
1252         if (!br->ip4_querier.addr.u.ip4)
1253                 goto update;
1254 
1255         if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1256                 goto update;
1257 
1258         return false;
1259 
1260 update:
1261         br->ip4_querier.addr.u.ip4 = saddr;
1262 
1263         /* update protected by general multicast_lock by caller */
1264         rcu_assign_pointer(br->ip4_querier.port, port);
1265 
1266         return true;
1267 }
1268 
1269 #if IS_ENABLED(CONFIG_IPV6)
1270 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1271                                             struct net_bridge_port *port,
1272                                             struct in6_addr *saddr)
1273 {
1274         if (!timer_pending(&br->ip6_own_query.timer) &&
1275             !timer_pending(&br->ip6_other_query.timer))
1276                 goto update;
1277 
1278         if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1279                 goto update;
1280 
1281         return false;
1282 
1283 update:
1284         br->ip6_querier.addr.u.ip6 = *saddr;
1285 
1286         /* update protected by general multicast_lock by caller */
1287         rcu_assign_pointer(br->ip6_querier.port, port);
1288 
1289         return true;
1290 }
1291 #endif
1292 
1293 static bool br_multicast_select_querier(struct net_bridge *br,
1294                                         struct net_bridge_port *port,
1295                                         struct br_ip *saddr)
1296 {
1297         switch (saddr->proto) {
1298         case htons(ETH_P_IP):
1299                 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1300 #if IS_ENABLED(CONFIG_IPV6)
1301         case htons(ETH_P_IPV6):
1302                 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1303 #endif
1304         }
1305 
1306         return false;
1307 }
1308 
1309 static void
1310 br_multicast_update_query_timer(struct net_bridge *br,
1311                                 struct bridge_mcast_other_query *query,
1312                                 unsigned long max_delay)
1313 {
1314         if (!timer_pending(&query->timer))
1315                 query->delay_time = jiffies + max_delay;
1316 
1317         mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1318 }
1319 
1320 static void br_port_mc_router_state_change(struct net_bridge_port *p,
1321                                            bool is_mc_router)
1322 {
1323         struct switchdev_attr attr = {
1324                 .orig_dev = p->dev,
1325                 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
1326                 .flags = SWITCHDEV_F_DEFER,
1327                 .u.mrouter = is_mc_router,
1328         };
1329 
1330         switchdev_port_attr_set(p->dev, &attr);
1331 }
1332 
1333 /*
1334  * Add port to router_list
1335  *  list is maintained ordered by pointer value
1336  *  and locked by br->multicast_lock and RCU
1337  */
1338 static void br_multicast_add_router(struct net_bridge *br,
1339                                     struct net_bridge_port *port)
1340 {
1341         struct net_bridge_port *p;
1342         struct hlist_node *slot = NULL;
1343 
1344         if (!hlist_unhashed(&port->rlist))
1345                 return;
1346 
1347         hlist_for_each_entry(p, &br->router_list, rlist) {
1348                 if ((unsigned long) port >= (unsigned long) p)
1349                         break;
1350                 slot = &p->rlist;
1351         }
1352 
1353         if (slot)
1354                 hlist_add_behind_rcu(&port->rlist, slot);
1355         else
1356                 hlist_add_head_rcu(&port->rlist, &br->router_list);
1357         br_rtr_notify(br->dev, port, RTM_NEWMDB);
1358         br_port_mc_router_state_change(port, true);
1359 }
1360 
1361 static void br_multicast_mark_router(struct net_bridge *br,
1362                                      struct net_bridge_port *port)
1363 {
1364         unsigned long now = jiffies;
1365 
1366         if (!port) {
1367                 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY)
1368                         mod_timer(&br->multicast_router_timer,
1369                                   now + br->multicast_querier_interval);
1370                 return;
1371         }
1372 
1373         if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1374             port->multicast_router == MDB_RTR_TYPE_PERM)
1375                 return;
1376 
1377         br_multicast_add_router(br, port);
1378 
1379         mod_timer(&port->multicast_router_timer,
1380                   now + br->multicast_querier_interval);
1381 }
1382 
1383 static void br_multicast_query_received(struct net_bridge *br,
1384                                         struct net_bridge_port *port,
1385                                         struct bridge_mcast_other_query *query,
1386                                         struct br_ip *saddr,
1387                                         unsigned long max_delay)
1388 {
1389         if (!br_multicast_select_querier(br, port, saddr))
1390                 return;
1391 
1392         br_multicast_update_query_timer(br, query, max_delay);
1393         br_multicast_mark_router(br, port);
1394 }
1395 
1396 static int br_ip4_multicast_query(struct net_bridge *br,
1397                                   struct net_bridge_port *port,
1398                                   struct sk_buff *skb,
1399                                   u16 vid)
1400 {
1401         const struct iphdr *iph = ip_hdr(skb);
1402         struct igmphdr *ih = igmp_hdr(skb);
1403         struct net_bridge_mdb_entry *mp;
1404         struct igmpv3_query *ih3;
1405         struct net_bridge_port_group *p;
1406         struct net_bridge_port_group __rcu **pp;
1407         struct br_ip saddr;
1408         unsigned long max_delay;
1409         unsigned long now = jiffies;
1410         unsigned int offset = skb_transport_offset(skb);
1411         __be32 group;
1412         int err = 0;
1413 
1414         spin_lock(&br->multicast_lock);
1415         if (!netif_running(br->dev) ||
1416             (port && port->state == BR_STATE_DISABLED))
1417                 goto out;
1418 
1419         group = ih->group;
1420 
1421         if (skb->len == offset + sizeof(*ih)) {
1422                 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1423 
1424                 if (!max_delay) {
1425                         max_delay = 10 * HZ;
1426                         group = 0;
1427                 }
1428         } else if (skb->len >= offset + sizeof(*ih3)) {
1429                 ih3 = igmpv3_query_hdr(skb);
1430                 if (ih3->nsrcs)
1431                         goto out;
1432 
1433                 max_delay = ih3->code ?
1434                             IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1435         } else {
1436                 goto out;
1437         }
1438 
1439         if (!group) {
1440                 saddr.proto = htons(ETH_P_IP);
1441                 saddr.u.ip4 = iph->saddr;
1442 
1443                 br_multicast_query_received(br, port, &br->ip4_other_query,
1444                                             &saddr, max_delay);
1445                 goto out;
1446         }
1447 
1448         mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1449         if (!mp)
1450                 goto out;
1451 
1452         max_delay *= br->multicast_last_member_count;
1453 
1454         if (mp->mglist &&
1455             (timer_pending(&mp->timer) ?
1456              time_after(mp->timer.expires, now + max_delay) :
1457              try_to_del_timer_sync(&mp->timer) >= 0))
1458                 mod_timer(&mp->timer, now + max_delay);
1459 
1460         for (pp = &mp->ports;
1461              (p = mlock_dereference(*pp, br)) != NULL;
1462              pp = &p->next) {
1463                 if (timer_pending(&p->timer) ?
1464                     time_after(p->timer.expires, now + max_delay) :
1465                     try_to_del_timer_sync(&p->timer) >= 0)
1466                         mod_timer(&p->timer, now + max_delay);
1467         }
1468 
1469 out:
1470         spin_unlock(&br->multicast_lock);
1471         return err;
1472 }
1473 
1474 #if IS_ENABLED(CONFIG_IPV6)
1475 static int br_ip6_multicast_query(struct net_bridge *br,
1476                                   struct net_bridge_port *port,
1477                                   struct sk_buff *skb,
1478                                   u16 vid)
1479 {
1480         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1481         struct mld_msg *mld;
1482         struct net_bridge_mdb_entry *mp;
1483         struct mld2_query *mld2q;
1484         struct net_bridge_port_group *p;
1485         struct net_bridge_port_group __rcu **pp;
1486         struct br_ip saddr;
1487         unsigned long max_delay;
1488         unsigned long now = jiffies;
1489         unsigned int offset = skb_transport_offset(skb);
1490         const struct in6_addr *group = NULL;
1491         bool is_general_query;
1492         int err = 0;
1493 
1494         spin_lock(&br->multicast_lock);
1495         if (!netif_running(br->dev) ||
1496             (port && port->state == BR_STATE_DISABLED))
1497                 goto out;
1498 
1499         if (skb->len == offset + sizeof(*mld)) {
1500                 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1501                         err = -EINVAL;
1502                         goto out;
1503                 }
1504                 mld = (struct mld_msg *) icmp6_hdr(skb);
1505                 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1506                 if (max_delay)
1507                         group = &mld->mld_mca;
1508         } else {
1509                 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1510                         err = -EINVAL;
1511                         goto out;
1512                 }
1513                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1514                 if (!mld2q->mld2q_nsrcs)
1515                         group = &mld2q->mld2q_mca;
1516 
1517                 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1518         }
1519 
1520         is_general_query = group && ipv6_addr_any(group);
1521 
1522         if (is_general_query) {
1523                 saddr.proto = htons(ETH_P_IPV6);
1524                 saddr.u.ip6 = ip6h->saddr;
1525 
1526                 br_multicast_query_received(br, port, &br->ip6_other_query,
1527                                             &saddr, max_delay);
1528                 goto out;
1529         } else if (!group) {
1530                 goto out;
1531         }
1532 
1533         mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1534         if (!mp)
1535                 goto out;
1536 
1537         max_delay *= br->multicast_last_member_count;
1538         if (mp->mglist &&
1539             (timer_pending(&mp->timer) ?
1540              time_after(mp->timer.expires, now + max_delay) :
1541              try_to_del_timer_sync(&mp->timer) >= 0))
1542                 mod_timer(&mp->timer, now + max_delay);
1543 
1544         for (pp = &mp->ports;
1545              (p = mlock_dereference(*pp, br)) != NULL;
1546              pp = &p->next) {
1547                 if (timer_pending(&p->timer) ?
1548                     time_after(p->timer.expires, now + max_delay) :
1549                     try_to_del_timer_sync(&p->timer) >= 0)
1550                         mod_timer(&p->timer, now + max_delay);
1551         }
1552 
1553 out:
1554         spin_unlock(&br->multicast_lock);
1555         return err;
1556 }
1557 #endif
1558 
1559 static void
1560 br_multicast_leave_group(struct net_bridge *br,
1561                          struct net_bridge_port *port,
1562                          struct br_ip *group,
1563                          struct bridge_mcast_other_query *other_query,
1564                          struct bridge_mcast_own_query *own_query,
1565                          const unsigned char *src)
1566 {
1567         struct net_bridge_mdb_htable *mdb;
1568         struct net_bridge_mdb_entry *mp;
1569         struct net_bridge_port_group *p;
1570         unsigned long now;
1571         unsigned long time;
1572 
1573         spin_lock(&br->multicast_lock);
1574         if (!netif_running(br->dev) ||
1575             (port && port->state == BR_STATE_DISABLED))
1576                 goto out;
1577 
1578         mdb = mlock_dereference(br->mdb, br);
1579         mp = br_mdb_ip_get(mdb, group);
1580         if (!mp)
1581                 goto out;
1582 
1583         if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1584                 struct net_bridge_port_group __rcu **pp;
1585 
1586                 for (pp = &mp->ports;
1587                      (p = mlock_dereference(*pp, br)) != NULL;
1588                      pp = &p->next) {
1589                         if (!br_port_group_equal(p, port, src))
1590                                 continue;
1591 
1592                         rcu_assign_pointer(*pp, p->next);
1593                         hlist_del_init(&p->mglist);
1594                         del_timer(&p->timer);
1595                         call_rcu_bh(&p->rcu, br_multicast_free_pg);
1596                         br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1597                                       p->flags);
1598 
1599                         if (!mp->ports && !mp->mglist &&
1600                             netif_running(br->dev))
1601                                 mod_timer(&mp->timer, jiffies);
1602                 }
1603                 goto out;
1604         }
1605 
1606         if (timer_pending(&other_query->timer))
1607                 goto out;
1608 
1609         if (br->multicast_querier) {
1610                 __br_multicast_send_query(br, port, &mp->addr);
1611 
1612                 time = jiffies + br->multicast_last_member_count *
1613                                  br->multicast_last_member_interval;
1614 
1615                 mod_timer(&own_query->timer, time);
1616 
1617                 for (p = mlock_dereference(mp->ports, br);
1618                      p != NULL;
1619                      p = mlock_dereference(p->next, br)) {
1620                         if (!br_port_group_equal(p, port, src))
1621                                 continue;
1622 
1623                         if (!hlist_unhashed(&p->mglist) &&
1624                             (timer_pending(&p->timer) ?
1625                              time_after(p->timer.expires, time) :
1626                              try_to_del_timer_sync(&p->timer) >= 0)) {
1627                                 mod_timer(&p->timer, time);
1628                         }
1629 
1630                         break;
1631                 }
1632         }
1633 
1634         now = jiffies;
1635         time = now + br->multicast_last_member_count *
1636                      br->multicast_last_member_interval;
1637 
1638         if (!port) {
1639                 if (mp->mglist &&
1640                     (timer_pending(&mp->timer) ?
1641                      time_after(mp->timer.expires, time) :
1642                      try_to_del_timer_sync(&mp->timer) >= 0)) {
1643                         mod_timer(&mp->timer, time);
1644                 }
1645 
1646                 goto out;
1647         }
1648 
1649         for (p = mlock_dereference(mp->ports, br);
1650              p != NULL;
1651              p = mlock_dereference(p->next, br)) {
1652                 if (p->port != port)
1653                         continue;
1654 
1655                 if (!hlist_unhashed(&p->mglist) &&
1656                     (timer_pending(&p->timer) ?
1657                      time_after(p->timer.expires, time) :
1658                      try_to_del_timer_sync(&p->timer) >= 0)) {
1659                         mod_timer(&p->timer, time);
1660                 }
1661 
1662                 break;
1663         }
1664 out:
1665         spin_unlock(&br->multicast_lock);
1666 }
1667 
1668 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1669                                          struct net_bridge_port *port,
1670                                          __be32 group,
1671                                          __u16 vid,
1672                                          const unsigned char *src)
1673 {
1674         struct br_ip br_group;
1675         struct bridge_mcast_own_query *own_query;
1676 
1677         if (ipv4_is_local_multicast(group))
1678                 return;
1679 
1680         own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1681 
1682         br_group.u.ip4 = group;
1683         br_group.proto = htons(ETH_P_IP);
1684         br_group.vid = vid;
1685 
1686         br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1687                                  own_query, src);
1688 }
1689 
1690 #if IS_ENABLED(CONFIG_IPV6)
1691 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1692                                          struct net_bridge_port *port,
1693                                          const struct in6_addr *group,
1694                                          __u16 vid,
1695                                          const unsigned char *src)
1696 {
1697         struct br_ip br_group;
1698         struct bridge_mcast_own_query *own_query;
1699 
1700         if (ipv6_addr_is_ll_all_nodes(group))
1701                 return;
1702 
1703         own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1704 
1705         br_group.u.ip6 = *group;
1706         br_group.proto = htons(ETH_P_IPV6);
1707         br_group.vid = vid;
1708 
1709         br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1710                                  own_query, src);
1711 }
1712 #endif
1713 
1714 static void br_multicast_err_count(const struct net_bridge *br,
1715                                    const struct net_bridge_port *p,
1716                                    __be16 proto)
1717 {
1718         struct bridge_mcast_stats __percpu *stats;
1719         struct bridge_mcast_stats *pstats;
1720 
1721         if (!br->multicast_stats_enabled)
1722                 return;
1723 
1724         if (p)
1725                 stats = p->mcast_stats;
1726         else
1727                 stats = br->mcast_stats;
1728         if (WARN_ON(!stats))
1729                 return;
1730 
1731         pstats = this_cpu_ptr(stats);
1732 
1733         u64_stats_update_begin(&pstats->syncp);
1734         switch (proto) {
1735         case htons(ETH_P_IP):
1736                 pstats->mstats.igmp_parse_errors++;
1737                 break;
1738 #if IS_ENABLED(CONFIG_IPV6)
1739         case htons(ETH_P_IPV6):
1740                 pstats->mstats.mld_parse_errors++;
1741                 break;
1742 #endif
1743         }
1744         u64_stats_update_end(&pstats->syncp);
1745 }
1746 
1747 static void br_multicast_pim(struct net_bridge *br,
1748                              struct net_bridge_port *port,
1749                              const struct sk_buff *skb)
1750 {
1751         unsigned int offset = skb_transport_offset(skb);
1752         struct pimhdr *pimhdr, _pimhdr;
1753 
1754         pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1755         if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1756             pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1757                 return;
1758 
1759         br_multicast_mark_router(br, port);
1760 }
1761 
1762 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1763                                  struct net_bridge_port *port,
1764                                  struct sk_buff *skb,
1765                                  u16 vid)
1766 {
1767         struct sk_buff *skb_trimmed = NULL;
1768         const unsigned char *src;
1769         struct igmphdr *ih;
1770         int err;
1771 
1772         err = ip_mc_check_igmp(skb, &skb_trimmed);
1773 
1774         if (err == -ENOMSG) {
1775                 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
1776                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1777                 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1778                         if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1779                                 br_multicast_pim(br, port, skb);
1780                 }
1781                 return 0;
1782         } else if (err < 0) {
1783                 br_multicast_err_count(br, port, skb->protocol);
1784                 return err;
1785         }
1786 
1787         ih = igmp_hdr(skb);
1788         src = eth_hdr(skb)->h_source;
1789         BR_INPUT_SKB_CB(skb)->igmp = ih->type;
1790 
1791         switch (ih->type) {
1792         case IGMP_HOST_MEMBERSHIP_REPORT:
1793         case IGMPV2_HOST_MEMBERSHIP_REPORT:
1794                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1795                 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
1796                 break;
1797         case IGMPV3_HOST_MEMBERSHIP_REPORT:
1798                 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1799                 break;
1800         case IGMP_HOST_MEMBERSHIP_QUERY:
1801                 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1802                 break;
1803         case IGMP_HOST_LEAVE_MESSAGE:
1804                 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
1805                 break;
1806         }
1807 
1808         if (skb_trimmed && skb_trimmed != skb)
1809                 kfree_skb(skb_trimmed);
1810 
1811         br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1812                            BR_MCAST_DIR_RX);
1813 
1814         return err;
1815 }
1816 
1817 #if IS_ENABLED(CONFIG_IPV6)
1818 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1819                                  struct net_bridge_port *port,
1820                                  struct sk_buff *skb,
1821                                  u16 vid)
1822 {
1823         struct sk_buff *skb_trimmed = NULL;
1824         const unsigned char *src;
1825         struct mld_msg *mld;
1826         int err;
1827 
1828         err = ipv6_mc_check_mld(skb, &skb_trimmed);
1829 
1830         if (err == -ENOMSG) {
1831                 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1832                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1833                 return 0;
1834         } else if (err < 0) {
1835                 br_multicast_err_count(br, port, skb->protocol);
1836                 return err;
1837         }
1838 
1839         mld = (struct mld_msg *)skb_transport_header(skb);
1840         BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
1841 
1842         switch (mld->mld_type) {
1843         case ICMPV6_MGM_REPORT:
1844                 src = eth_hdr(skb)->h_source;
1845                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1846                 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
1847                                                  src);
1848                 break;
1849         case ICMPV6_MLD2_REPORT:
1850                 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1851                 break;
1852         case ICMPV6_MGM_QUERY:
1853                 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1854                 break;
1855         case ICMPV6_MGM_REDUCTION:
1856                 src = eth_hdr(skb)->h_source;
1857                 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
1858                 break;
1859         }
1860 
1861         if (skb_trimmed && skb_trimmed != skb)
1862                 kfree_skb(skb_trimmed);
1863 
1864         br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1865                            BR_MCAST_DIR_RX);
1866 
1867         return err;
1868 }
1869 #endif
1870 
1871 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1872                      struct sk_buff *skb, u16 vid)
1873 {
1874         int ret = 0;
1875 
1876         BR_INPUT_SKB_CB(skb)->igmp = 0;
1877         BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1878 
1879         if (br->multicast_disabled)
1880                 return 0;
1881 
1882         switch (skb->protocol) {
1883         case htons(ETH_P_IP):
1884                 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1885                 break;
1886 #if IS_ENABLED(CONFIG_IPV6)
1887         case htons(ETH_P_IPV6):
1888                 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1889                 break;
1890 #endif
1891         }
1892 
1893         return ret;
1894 }
1895 
1896 static void br_multicast_query_expired(struct net_bridge *br,
1897                                        struct bridge_mcast_own_query *query,
1898                                        struct bridge_mcast_querier *querier)
1899 {
1900         spin_lock(&br->multicast_lock);
1901         if (query->startup_sent < br->multicast_startup_query_count)
1902                 query->startup_sent++;
1903 
1904         RCU_INIT_POINTER(querier->port, NULL);
1905         br_multicast_send_query(br, NULL, query);
1906         spin_unlock(&br->multicast_lock);
1907 }
1908 
1909 static void br_ip4_multicast_query_expired(unsigned long data)
1910 {
1911         struct net_bridge *br = (void *)data;
1912 
1913         br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1914 }
1915 
1916 #if IS_ENABLED(CONFIG_IPV6)
1917 static void br_ip6_multicast_query_expired(unsigned long data)
1918 {
1919         struct net_bridge *br = (void *)data;
1920 
1921         br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1922 }
1923 #endif
1924 
1925 void br_multicast_init(struct net_bridge *br)
1926 {
1927         br->hash_elasticity = 4;
1928         br->hash_max = 512;
1929 
1930         br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1931         br->multicast_querier = 0;
1932         br->multicast_query_use_ifaddr = 0;
1933         br->multicast_last_member_count = 2;
1934         br->multicast_startup_query_count = 2;
1935 
1936         br->multicast_last_member_interval = HZ;
1937         br->multicast_query_response_interval = 10 * HZ;
1938         br->multicast_startup_query_interval = 125 * HZ / 4;
1939         br->multicast_query_interval = 125 * HZ;
1940         br->multicast_querier_interval = 255 * HZ;
1941         br->multicast_membership_interval = 260 * HZ;
1942 
1943         br->ip4_other_query.delay_time = 0;
1944         br->ip4_querier.port = NULL;
1945         br->multicast_igmp_version = 2;
1946 #if IS_ENABLED(CONFIG_IPV6)
1947         br->multicast_mld_version = 1;
1948         br->ip6_other_query.delay_time = 0;
1949         br->ip6_querier.port = NULL;
1950 #endif
1951         br->has_ipv6_addr = 1;
1952 
1953         spin_lock_init(&br->multicast_lock);
1954         setup_timer(&br->multicast_router_timer,
1955                     br_multicast_local_router_expired, 0);
1956         setup_timer(&br->ip4_other_query.timer,
1957                     br_ip4_multicast_querier_expired, (unsigned long)br);
1958         setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1959                     (unsigned long)br);
1960 #if IS_ENABLED(CONFIG_IPV6)
1961         setup_timer(&br->ip6_other_query.timer,
1962                     br_ip6_multicast_querier_expired, (unsigned long)br);
1963         setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1964                     (unsigned long)br);
1965 #endif
1966 }
1967 
1968 static void __br_multicast_open(struct net_bridge *br,
1969                                 struct bridge_mcast_own_query *query)
1970 {
1971         query->startup_sent = 0;
1972 
1973         if (br->multicast_disabled)
1974                 return;
1975 
1976         mod_timer(&query->timer, jiffies);
1977 }
1978 
1979 void br_multicast_open(struct net_bridge *br)
1980 {
1981         __br_multicast_open(br, &br->ip4_own_query);
1982 #if IS_ENABLED(CONFIG_IPV6)
1983         __br_multicast_open(br, &br->ip6_own_query);
1984 #endif
1985 }
1986 
1987 void br_multicast_stop(struct net_bridge *br)
1988 {
1989         del_timer_sync(&br->multicast_router_timer);
1990         del_timer_sync(&br->ip4_other_query.timer);
1991         del_timer_sync(&br->ip4_own_query.timer);
1992 #if IS_ENABLED(CONFIG_IPV6)
1993         del_timer_sync(&br->ip6_other_query.timer);
1994         del_timer_sync(&br->ip6_own_query.timer);
1995 #endif
1996 }
1997 
1998 void br_multicast_dev_del(struct net_bridge *br)
1999 {
2000         struct net_bridge_mdb_htable *mdb;
2001         struct net_bridge_mdb_entry *mp;
2002         struct hlist_node *n;
2003         u32 ver;
2004         int i;
2005 
2006         spin_lock_bh(&br->multicast_lock);
2007         mdb = mlock_dereference(br->mdb, br);
2008         if (!mdb)
2009                 goto out;
2010 
2011         br->mdb = NULL;
2012 
2013         ver = mdb->ver;
2014         for (i = 0; i < mdb->max; i++) {
2015                 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
2016                                           hlist[ver]) {
2017                         del_timer(&mp->timer);
2018                         call_rcu_bh(&mp->rcu, br_multicast_free_group);
2019                 }
2020         }
2021 
2022         if (mdb->old) {
2023                 spin_unlock_bh(&br->multicast_lock);
2024                 rcu_barrier_bh();
2025                 spin_lock_bh(&br->multicast_lock);
2026                 WARN_ON(mdb->old);
2027         }
2028 
2029         mdb->old = mdb;
2030         call_rcu_bh(&mdb->rcu, br_mdb_free);
2031 
2032 out:
2033         spin_unlock_bh(&br->multicast_lock);
2034 }
2035 
2036 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
2037 {
2038         int err = -EINVAL;
2039 
2040         spin_lock_bh(&br->multicast_lock);
2041 
2042         switch (val) {
2043         case MDB_RTR_TYPE_DISABLED:
2044         case MDB_RTR_TYPE_PERM:
2045                 del_timer(&br->multicast_router_timer);
2046                 /* fall through */
2047         case MDB_RTR_TYPE_TEMP_QUERY:
2048                 br->multicast_router = val;
2049                 err = 0;
2050                 break;
2051         }
2052 
2053         spin_unlock_bh(&br->multicast_lock);
2054 
2055         return err;
2056 }
2057 
2058 static void __del_port_router(struct net_bridge_port *p)
2059 {
2060         if (hlist_unhashed(&p->rlist))
2061                 return;
2062         hlist_del_init_rcu(&p->rlist);
2063         br_rtr_notify(p->br->dev, p, RTM_DELMDB);
2064         br_port_mc_router_state_change(p, false);
2065 
2066         /* don't allow timer refresh */
2067         if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2068                 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2069 }
2070 
2071 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
2072 {
2073         struct net_bridge *br = p->br;
2074         unsigned long now = jiffies;
2075         int err = -EINVAL;
2076 
2077         spin_lock(&br->multicast_lock);
2078         if (p->multicast_router == val) {
2079                 /* Refresh the temp router port timer */
2080                 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2081                         mod_timer(&p->multicast_router_timer,
2082                                   now + br->multicast_querier_interval);
2083                 err = 0;
2084                 goto unlock;
2085         }
2086         switch (val) {
2087         case MDB_RTR_TYPE_DISABLED:
2088                 p->multicast_router = MDB_RTR_TYPE_DISABLED;
2089                 __del_port_router(p);
2090                 del_timer(&p->multicast_router_timer);
2091                 break;
2092         case MDB_RTR_TYPE_TEMP_QUERY:
2093                 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2094                 __del_port_router(p);
2095                 break;
2096         case MDB_RTR_TYPE_PERM:
2097                 p->multicast_router = MDB_RTR_TYPE_PERM;
2098                 del_timer(&p->multicast_router_timer);
2099                 br_multicast_add_router(br, p);
2100                 break;
2101         case MDB_RTR_TYPE_TEMP:
2102                 p->multicast_router = MDB_RTR_TYPE_TEMP;
2103                 br_multicast_mark_router(br, p);
2104                 break;
2105         default:
2106                 goto unlock;
2107         }
2108         err = 0;
2109 unlock:
2110         spin_unlock(&br->multicast_lock);
2111 
2112         return err;
2113 }
2114 
2115 static void br_multicast_start_querier(struct net_bridge *br,
2116                                        struct bridge_mcast_own_query *query)
2117 {
2118         struct net_bridge_port *port;
2119 
2120         __br_multicast_open(br, query);
2121 
2122         list_for_each_entry(port, &br->port_list, list) {
2123                 if (port->state == BR_STATE_DISABLED ||
2124                     port->state == BR_STATE_BLOCKING)
2125                         continue;
2126 
2127                 if (query == &br->ip4_own_query)
2128                         br_multicast_enable(&port->ip4_own_query);
2129 #if IS_ENABLED(CONFIG_IPV6)
2130                 else
2131                         br_multicast_enable(&port->ip6_own_query);
2132 #endif
2133         }
2134 }
2135 
2136 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2137 {
2138         struct net_bridge_mdb_htable *mdb;
2139         struct net_bridge_port *port;
2140         int err = 0;
2141 
2142         spin_lock_bh(&br->multicast_lock);
2143         if (br->multicast_disabled == !val)
2144                 goto unlock;
2145 
2146         br_mc_disabled_update(br->dev, !val);
2147         br->multicast_disabled = !val;
2148         if (br->multicast_disabled)
2149                 goto unlock;
2150 
2151         if (!netif_running(br->dev))
2152                 goto unlock;
2153 
2154         mdb = mlock_dereference(br->mdb, br);
2155         if (mdb) {
2156                 if (mdb->old) {
2157                         err = -EEXIST;
2158 rollback:
2159                         br->multicast_disabled = !!val;
2160                         goto unlock;
2161                 }
2162 
2163                 err = br_mdb_rehash(&br->mdb, mdb->max,
2164                                     br->hash_elasticity);
2165                 if (err)
2166                         goto rollback;
2167         }
2168 
2169         br_multicast_open(br);
2170         list_for_each_entry(port, &br->port_list, list)
2171                 __br_multicast_enable_port(port);
2172 
2173 unlock:
2174         spin_unlock_bh(&br->multicast_lock);
2175 
2176         return err;
2177 }
2178 
2179 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2180 {
2181         unsigned long max_delay;
2182 
2183         val = !!val;
2184 
2185         spin_lock_bh(&br->multicast_lock);
2186         if (br->multicast_querier == val)
2187                 goto unlock;
2188 
2189         br->multicast_querier = val;
2190         if (!val)
2191                 goto unlock;
2192 
2193         max_delay = br->multicast_query_response_interval;
2194 
2195         if (!timer_pending(&br->ip4_other_query.timer))
2196                 br->ip4_other_query.delay_time = jiffies + max_delay;
2197 
2198         br_multicast_start_querier(br, &br->ip4_own_query);
2199 
2200 #if IS_ENABLED(CONFIG_IPV6)
2201         if (!timer_pending(&br->ip6_other_query.timer))
2202                 br->ip6_other_query.delay_time = jiffies + max_delay;
2203 
2204         br_multicast_start_querier(br, &br->ip6_own_query);
2205 #endif
2206 
2207 unlock:
2208         spin_unlock_bh(&br->multicast_lock);
2209 
2210         return 0;
2211 }
2212 
2213 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2214 {
2215         int err = -EINVAL;
2216         u32 old;
2217         struct net_bridge_mdb_htable *mdb;
2218 
2219         spin_lock_bh(&br->multicast_lock);
2220         if (!is_power_of_2(val))
2221                 goto unlock;
2222 
2223         mdb = mlock_dereference(br->mdb, br);
2224         if (mdb && val < mdb->size)
2225                 goto unlock;
2226 
2227         err = 0;
2228 
2229         old = br->hash_max;
2230         br->hash_max = val;
2231 
2232         if (mdb) {
2233                 if (mdb->old) {
2234                         err = -EEXIST;
2235 rollback:
2236                         br->hash_max = old;
2237                         goto unlock;
2238                 }
2239 
2240                 err = br_mdb_rehash(&br->mdb, br->hash_max,
2241                                     br->hash_elasticity);
2242                 if (err)
2243                         goto rollback;
2244         }
2245 
2246 unlock:
2247         spin_unlock_bh(&br->multicast_lock);
2248 
2249         return err;
2250 }
2251 
2252 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2253 {
2254         /* Currently we support only version 2 and 3 */
2255         switch (val) {
2256         case 2:
2257         case 3:
2258                 break;
2259         default:
2260                 return -EINVAL;
2261         }
2262 
2263         spin_lock_bh(&br->multicast_lock);
2264         br->multicast_igmp_version = val;
2265         spin_unlock_bh(&br->multicast_lock);
2266 
2267         return 0;
2268 }
2269 
2270 #if IS_ENABLED(CONFIG_IPV6)
2271 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2272 {
2273         /* Currently we support version 1 and 2 */
2274         switch (val) {
2275         case 1:
2276         case 2:
2277                 break;
2278         default:
2279                 return -EINVAL;
2280         }
2281 
2282         spin_lock_bh(&br->multicast_lock);
2283         br->multicast_mld_version = val;
2284         spin_unlock_bh(&br->multicast_lock);
2285 
2286         return 0;
2287 }
2288 #endif
2289 
2290 /**
2291  * br_multicast_list_adjacent - Returns snooped multicast addresses
2292  * @dev:        The bridge port adjacent to which to retrieve addresses
2293  * @br_ip_list: The list to store found, snooped multicast IP addresses in
2294  *
2295  * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2296  * snooping feature on all bridge ports of dev's bridge device, excluding
2297  * the addresses from dev itself.
2298  *
2299  * Returns the number of items added to br_ip_list.
2300  *
2301  * Notes:
2302  * - br_ip_list needs to be initialized by caller
2303  * - br_ip_list might contain duplicates in the end
2304  *   (needs to be taken care of by caller)
2305  * - br_ip_list needs to be freed by caller
2306  */
2307 int br_multicast_list_adjacent(struct net_device *dev,
2308                                struct list_head *br_ip_list)
2309 {
2310         struct net_bridge *br;
2311         struct net_bridge_port *port;
2312         struct net_bridge_port_group *group;
2313         struct br_ip_list *entry;
2314         int count = 0;
2315 
2316         rcu_read_lock();
2317         if (!br_ip_list || !br_port_exists(dev))
2318                 goto unlock;
2319 
2320         port = br_port_get_rcu(dev);
2321         if (!port || !port->br)
2322                 goto unlock;
2323 
2324         br = port->br;
2325 
2326         list_for_each_entry_rcu(port, &br->port_list, list) {
2327                 if (!port->dev || port->dev == dev)
2328                         continue;
2329 
2330                 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2331                         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2332                         if (!entry)
2333                                 goto unlock;
2334 
2335                         entry->addr = group->addr;
2336                         list_add(&entry->list, br_ip_list);
2337                         count++;
2338                 }
2339         }
2340 
2341 unlock:
2342         rcu_read_unlock();
2343         return count;
2344 }
2345 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2346 
2347 /**
2348  * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2349  * @dev: The bridge port providing the bridge on which to check for a querier
2350  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2351  *
2352  * Checks whether the given interface has a bridge on top and if so returns
2353  * true if a valid querier exists anywhere on the bridged link layer.
2354  * Otherwise returns false.
2355  */
2356 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2357 {
2358         struct net_bridge *br;
2359         struct net_bridge_port *port;
2360         struct ethhdr eth;
2361         bool ret = false;
2362 
2363         rcu_read_lock();
2364         if (!br_port_exists(dev))
2365                 goto unlock;
2366 
2367         port = br_port_get_rcu(dev);
2368         if (!port || !port->br)
2369                 goto unlock;
2370 
2371         br = port->br;
2372 
2373         memset(&eth, 0, sizeof(eth));
2374         eth.h_proto = htons(proto);
2375 
2376         ret = br_multicast_querier_exists(br, &eth);
2377 
2378 unlock:
2379         rcu_read_unlock();
2380         return ret;
2381 }
2382 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2383 
2384 /**
2385  * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2386  * @dev: The bridge port adjacent to which to check for a querier
2387  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2388  *
2389  * Checks whether the given interface has a bridge on top and if so returns
2390  * true if a selected querier is behind one of the other ports of this
2391  * bridge. Otherwise returns false.
2392  */
2393 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2394 {
2395         struct net_bridge *br;
2396         struct net_bridge_port *port;
2397         bool ret = false;
2398 
2399         rcu_read_lock();
2400         if (!br_port_exists(dev))
2401                 goto unlock;
2402 
2403         port = br_port_get_rcu(dev);
2404         if (!port || !port->br)
2405                 goto unlock;
2406 
2407         br = port->br;
2408 
2409         switch (proto) {
2410         case ETH_P_IP:
2411                 if (!timer_pending(&br->ip4_other_query.timer) ||
2412                     rcu_dereference(br->ip4_querier.port) == port)
2413                         goto unlock;
2414                 break;
2415 #if IS_ENABLED(CONFIG_IPV6)
2416         case ETH_P_IPV6:
2417                 if (!timer_pending(&br->ip6_other_query.timer) ||
2418                     rcu_dereference(br->ip6_querier.port) == port)
2419                         goto unlock;
2420                 break;
2421 #endif
2422         default:
2423                 goto unlock;
2424         }
2425 
2426         ret = true;
2427 unlock:
2428         rcu_read_unlock();
2429         return ret;
2430 }
2431 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2432 
2433 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
2434                                const struct sk_buff *skb, u8 type, u8 dir)
2435 {
2436         struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
2437         __be16 proto = skb->protocol;
2438         unsigned int t_len;
2439 
2440         u64_stats_update_begin(&pstats->syncp);
2441         switch (proto) {
2442         case htons(ETH_P_IP):
2443                 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
2444                 switch (type) {
2445                 case IGMP_HOST_MEMBERSHIP_REPORT:
2446                         pstats->mstats.igmp_v1reports[dir]++;
2447                         break;
2448                 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2449                         pstats->mstats.igmp_v2reports[dir]++;
2450                         break;
2451                 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2452                         pstats->mstats.igmp_v3reports[dir]++;
2453                         break;
2454                 case IGMP_HOST_MEMBERSHIP_QUERY:
2455                         if (t_len != sizeof(struct igmphdr)) {
2456                                 pstats->mstats.igmp_v3queries[dir]++;
2457                         } else {
2458                                 unsigned int offset = skb_transport_offset(skb);
2459                                 struct igmphdr *ih, _ihdr;
2460 
2461                                 ih = skb_header_pointer(skb, offset,
2462                                                         sizeof(_ihdr), &_ihdr);
2463                                 if (!ih)
2464                                         break;
2465                                 if (!ih->code)
2466                                         pstats->mstats.igmp_v1queries[dir]++;
2467                                 else
2468                                         pstats->mstats.igmp_v2queries[dir]++;
2469                         }
2470                         break;
2471                 case IGMP_HOST_LEAVE_MESSAGE:
2472                         pstats->mstats.igmp_leaves[dir]++;
2473                         break;
2474                 }
2475                 break;
2476 #if IS_ENABLED(CONFIG_IPV6)
2477         case htons(ETH_P_IPV6):
2478                 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2479                         sizeof(struct ipv6hdr);
2480                 t_len -= skb_network_header_len(skb);
2481                 switch (type) {
2482                 case ICMPV6_MGM_REPORT:
2483                         pstats->mstats.mld_v1reports[dir]++;
2484                         break;
2485                 case ICMPV6_MLD2_REPORT:
2486                         pstats->mstats.mld_v2reports[dir]++;
2487                         break;
2488                 case ICMPV6_MGM_QUERY:
2489                         if (t_len != sizeof(struct mld_msg))
2490                                 pstats->mstats.mld_v2queries[dir]++;
2491                         else
2492                                 pstats->mstats.mld_v1queries[dir]++;
2493                         break;
2494                 case ICMPV6_MGM_REDUCTION:
2495                         pstats->mstats.mld_leaves[dir]++;
2496                         break;
2497                 }
2498                 break;
2499 #endif /* CONFIG_IPV6 */
2500         }
2501         u64_stats_update_end(&pstats->syncp);
2502 }
2503 
2504 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
2505                         const struct sk_buff *skb, u8 type, u8 dir)
2506 {
2507         struct bridge_mcast_stats __percpu *stats;
2508 
2509         /* if multicast_disabled is true then igmp type can't be set */
2510         if (!type || !br->multicast_stats_enabled)
2511                 return;
2512 
2513         if (p)
2514                 stats = p->mcast_stats;
2515         else
2516                 stats = br->mcast_stats;
2517         if (WARN_ON(!stats))
2518                 return;
2519 
2520         br_mcast_stats_add(stats, skb, type, dir);
2521 }
2522 
2523 int br_multicast_init_stats(struct net_bridge *br)
2524 {
2525         br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2526         if (!br->mcast_stats)
2527                 return -ENOMEM;
2528 
2529         return 0;
2530 }
2531 
2532 void br_multicast_uninit_stats(struct net_bridge *br)
2533 {
2534         free_percpu(br->mcast_stats);
2535 }
2536 
2537 static void mcast_stats_add_dir(u64 *dst, u64 *src)
2538 {
2539         dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2540         dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2541 }
2542 
2543 void br_multicast_get_stats(const struct net_bridge *br,
2544                             const struct net_bridge_port *p,
2545                             struct br_mcast_stats *dest)
2546 {
2547         struct bridge_mcast_stats __percpu *stats;
2548         struct br_mcast_stats tdst;
2549         int i;
2550 
2551         memset(dest, 0, sizeof(*dest));
2552         if (p)
2553                 stats = p->mcast_stats;
2554         else
2555                 stats = br->mcast_stats;
2556         if (WARN_ON(!stats))
2557                 return;
2558 
2559         memset(&tdst, 0, sizeof(tdst));
2560         for_each_possible_cpu(i) {
2561                 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2562                 struct br_mcast_stats temp;
2563                 unsigned int start;
2564 
2565                 do {
2566                         start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2567                         memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2568                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2569 
2570                 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2571                 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2572                 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
2573                 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2574                 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2575                 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2576                 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2577                 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2578 
2579                 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2580                 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
2581                 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2582                 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2583                 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2584                 tdst.mld_parse_errors += temp.mld_parse_errors;
2585         }
2586         memcpy(dest, &tdst, sizeof(*dest));
2587 }
2588 

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