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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(struct timer_list *t)
243 {
244         struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer);
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->host_joined = false;
253         br_mdb_notify(br->dev, NULL, &mp->addr, RTM_DELMDB, 0);
254 
255         if (mp->ports)
256                 goto out;
257 
258         mdb = mlock_dereference(br->mdb, br);
259 
260         hlist_del_rcu(&mp->hlist[mdb->ver]);
261         mdb->size--;
262 
263         call_rcu_bh(&mp->rcu, br_multicast_free_group);
264 
265 out:
266         spin_unlock(&br->multicast_lock);
267 }
268 
269 static void br_multicast_del_pg(struct net_bridge *br,
270                                 struct net_bridge_port_group *pg)
271 {
272         struct net_bridge_mdb_htable *mdb;
273         struct net_bridge_mdb_entry *mp;
274         struct net_bridge_port_group *p;
275         struct net_bridge_port_group __rcu **pp;
276 
277         mdb = mlock_dereference(br->mdb, br);
278 
279         mp = br_mdb_ip_get(mdb, &pg->addr);
280         if (WARN_ON(!mp))
281                 return;
282 
283         for (pp = &mp->ports;
284              (p = mlock_dereference(*pp, br)) != NULL;
285              pp = &p->next) {
286                 if (p != pg)
287                         continue;
288 
289                 rcu_assign_pointer(*pp, p->next);
290                 hlist_del_init(&p->mglist);
291                 del_timer(&p->timer);
292                 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
293                               p->flags);
294                 call_rcu_bh(&p->rcu, br_multicast_free_pg);
295 
296                 if (!mp->ports && !mp->host_joined &&
297                     netif_running(br->dev))
298                         mod_timer(&mp->timer, jiffies);
299 
300                 return;
301         }
302 
303         WARN_ON(1);
304 }
305 
306 static void br_multicast_port_group_expired(struct timer_list *t)
307 {
308         struct net_bridge_port_group *pg = from_timer(pg, t, timer);
309         struct net_bridge *br = pg->port->br;
310 
311         spin_lock(&br->multicast_lock);
312         if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
313             hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
314                 goto out;
315 
316         br_multicast_del_pg(br, pg);
317 
318 out:
319         spin_unlock(&br->multicast_lock);
320 }
321 
322 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
323                          int elasticity)
324 {
325         struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
326         struct net_bridge_mdb_htable *mdb;
327         int err;
328 
329         mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
330         if (!mdb)
331                 return -ENOMEM;
332 
333         mdb->max = max;
334         mdb->old = old;
335 
336         mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
337         if (!mdb->mhash) {
338                 kfree(mdb);
339                 return -ENOMEM;
340         }
341 
342         mdb->size = old ? old->size : 0;
343         mdb->ver = old ? old->ver ^ 1 : 0;
344 
345         if (!old || elasticity)
346                 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
347         else
348                 mdb->secret = old->secret;
349 
350         if (!old)
351                 goto out;
352 
353         err = br_mdb_copy(mdb, old, elasticity);
354         if (err) {
355                 kfree(mdb->mhash);
356                 kfree(mdb);
357                 return err;
358         }
359 
360         br_mdb_rehash_seq++;
361         call_rcu_bh(&mdb->rcu, br_mdb_free);
362 
363 out:
364         rcu_assign_pointer(*mdbp, mdb);
365 
366         return 0;
367 }
368 
369 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
370                                                     __be32 group,
371                                                     u8 *igmp_type)
372 {
373         struct igmpv3_query *ihv3;
374         size_t igmp_hdr_size;
375         struct sk_buff *skb;
376         struct igmphdr *ih;
377         struct ethhdr *eth;
378         struct iphdr *iph;
379 
380         igmp_hdr_size = sizeof(*ih);
381         if (br->multicast_igmp_version == 3)
382                 igmp_hdr_size = sizeof(*ihv3);
383         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
384                                                  igmp_hdr_size + 4);
385         if (!skb)
386                 goto out;
387 
388         skb->protocol = htons(ETH_P_IP);
389 
390         skb_reset_mac_header(skb);
391         eth = eth_hdr(skb);
392 
393         ether_addr_copy(eth->h_source, br->dev->dev_addr);
394         eth->h_dest[0] = 1;
395         eth->h_dest[1] = 0;
396         eth->h_dest[2] = 0x5e;
397         eth->h_dest[3] = 0;
398         eth->h_dest[4] = 0;
399         eth->h_dest[5] = 1;
400         eth->h_proto = htons(ETH_P_IP);
401         skb_put(skb, sizeof(*eth));
402 
403         skb_set_network_header(skb, skb->len);
404         iph = ip_hdr(skb);
405 
406         iph->version = 4;
407         iph->ihl = 6;
408         iph->tos = 0xc0;
409         iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4);
410         iph->id = 0;
411         iph->frag_off = htons(IP_DF);
412         iph->ttl = 1;
413         iph->protocol = IPPROTO_IGMP;
414         iph->saddr = br->multicast_query_use_ifaddr ?
415                      inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
416         iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
417         ((u8 *)&iph[1])[0] = IPOPT_RA;
418         ((u8 *)&iph[1])[1] = 4;
419         ((u8 *)&iph[1])[2] = 0;
420         ((u8 *)&iph[1])[3] = 0;
421         ip_send_check(iph);
422         skb_put(skb, 24);
423 
424         skb_set_transport_header(skb, skb->len);
425         *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
426 
427         switch (br->multicast_igmp_version) {
428         case 2:
429                 ih = igmp_hdr(skb);
430                 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
431                 ih->code = (group ? br->multicast_last_member_interval :
432                                     br->multicast_query_response_interval) /
433                            (HZ / IGMP_TIMER_SCALE);
434                 ih->group = group;
435                 ih->csum = 0;
436                 ih->csum = ip_compute_csum((void *)ih, sizeof(*ih));
437                 break;
438         case 3:
439                 ihv3 = igmpv3_query_hdr(skb);
440                 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
441                 ihv3->code = (group ? br->multicast_last_member_interval :
442                                       br->multicast_query_response_interval) /
443                              (HZ / IGMP_TIMER_SCALE);
444                 ihv3->group = group;
445                 ihv3->qqic = br->multicast_query_interval / HZ;
446                 ihv3->nsrcs = 0;
447                 ihv3->resv = 0;
448                 ihv3->suppress = 0;
449                 ihv3->qrv = 2;
450                 ihv3->csum = 0;
451                 ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3));
452                 break;
453         }
454 
455         skb_put(skb, igmp_hdr_size);
456         __skb_pull(skb, sizeof(*eth));
457 
458 out:
459         return skb;
460 }
461 
462 #if IS_ENABLED(CONFIG_IPV6)
463 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
464                                                     const struct in6_addr *grp,
465                                                     u8 *igmp_type)
466 {
467         struct mld2_query *mld2q;
468         unsigned long interval;
469         struct ipv6hdr *ip6h;
470         struct mld_msg *mldq;
471         size_t mld_hdr_size;
472         struct sk_buff *skb;
473         struct ethhdr *eth;
474         u8 *hopopt;
475 
476         mld_hdr_size = sizeof(*mldq);
477         if (br->multicast_mld_version == 2)
478                 mld_hdr_size = sizeof(*mld2q);
479         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
480                                                  8 + mld_hdr_size);
481         if (!skb)
482                 goto out;
483 
484         skb->protocol = htons(ETH_P_IPV6);
485 
486         /* Ethernet header */
487         skb_reset_mac_header(skb);
488         eth = eth_hdr(skb);
489 
490         ether_addr_copy(eth->h_source, br->dev->dev_addr);
491         eth->h_proto = htons(ETH_P_IPV6);
492         skb_put(skb, sizeof(*eth));
493 
494         /* IPv6 header + HbH option */
495         skb_set_network_header(skb, skb->len);
496         ip6h = ipv6_hdr(skb);
497 
498         *(__force __be32 *)ip6h = htonl(0x60000000);
499         ip6h->payload_len = htons(8 + mld_hdr_size);
500         ip6h->nexthdr = IPPROTO_HOPOPTS;
501         ip6h->hop_limit = 1;
502         ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
503         if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
504                                &ip6h->saddr)) {
505                 kfree_skb(skb);
506                 br->has_ipv6_addr = 0;
507                 return NULL;
508         }
509 
510         br->has_ipv6_addr = 1;
511         ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
512 
513         hopopt = (u8 *)(ip6h + 1);
514         hopopt[0] = IPPROTO_ICMPV6;             /* next hdr */
515         hopopt[1] = 0;                          /* length of HbH */
516         hopopt[2] = IPV6_TLV_ROUTERALERT;       /* Router Alert */
517         hopopt[3] = 2;                          /* Length of RA Option */
518         hopopt[4] = 0;                          /* Type = 0x0000 (MLD) */
519         hopopt[5] = 0;
520         hopopt[6] = IPV6_TLV_PAD1;              /* Pad1 */
521         hopopt[7] = IPV6_TLV_PAD1;              /* Pad1 */
522 
523         skb_put(skb, sizeof(*ip6h) + 8);
524 
525         /* ICMPv6 */
526         skb_set_transport_header(skb, skb->len);
527         interval = ipv6_addr_any(grp) ?
528                         br->multicast_query_response_interval :
529                         br->multicast_last_member_interval;
530         *igmp_type = ICMPV6_MGM_QUERY;
531         switch (br->multicast_mld_version) {
532         case 1:
533                 mldq = (struct mld_msg *)icmp6_hdr(skb);
534                 mldq->mld_type = ICMPV6_MGM_QUERY;
535                 mldq->mld_code = 0;
536                 mldq->mld_cksum = 0;
537                 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
538                 mldq->mld_reserved = 0;
539                 mldq->mld_mca = *grp;
540                 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
541                                                   sizeof(*mldq), IPPROTO_ICMPV6,
542                                                   csum_partial(mldq,
543                                                                sizeof(*mldq),
544                                                                0));
545                 break;
546         case 2:
547                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
548                 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
549                 mld2q->mld2q_type = ICMPV6_MGM_QUERY;
550                 mld2q->mld2q_code = 0;
551                 mld2q->mld2q_cksum = 0;
552                 mld2q->mld2q_resv1 = 0;
553                 mld2q->mld2q_resv2 = 0;
554                 mld2q->mld2q_suppress = 0;
555                 mld2q->mld2q_qrv = 2;
556                 mld2q->mld2q_nsrcs = 0;
557                 mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
558                 mld2q->mld2q_mca = *grp;
559                 mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
560                                                      sizeof(*mld2q),
561                                                      IPPROTO_ICMPV6,
562                                                      csum_partial(mld2q,
563                                                                   sizeof(*mld2q),
564                                                                   0));
565                 break;
566         }
567         skb_put(skb, mld_hdr_size);
568 
569         __skb_pull(skb, sizeof(*eth));
570 
571 out:
572         return skb;
573 }
574 #endif
575 
576 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
577                                                 struct br_ip *addr,
578                                                 u8 *igmp_type)
579 {
580         switch (addr->proto) {
581         case htons(ETH_P_IP):
582                 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
583 #if IS_ENABLED(CONFIG_IPV6)
584         case htons(ETH_P_IPV6):
585                 return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
586                                                     igmp_type);
587 #endif
588         }
589         return NULL;
590 }
591 
592 static struct net_bridge_mdb_entry *br_multicast_get_group(
593         struct net_bridge *br, struct net_bridge_port *port,
594         struct br_ip *group, int hash)
595 {
596         struct net_bridge_mdb_htable *mdb;
597         struct net_bridge_mdb_entry *mp;
598         unsigned int count = 0;
599         unsigned int max;
600         int elasticity;
601         int err;
602 
603         mdb = rcu_dereference_protected(br->mdb, 1);
604         hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
605                 count++;
606                 if (unlikely(br_ip_equal(group, &mp->addr)))
607                         return mp;
608         }
609 
610         elasticity = 0;
611         max = mdb->max;
612 
613         if (unlikely(count > br->hash_elasticity && count)) {
614                 if (net_ratelimit())
615                         br_info(br, "Multicast hash table "
616                                 "chain limit reached: %s\n",
617                                 port ? port->dev->name : br->dev->name);
618 
619                 elasticity = br->hash_elasticity;
620         }
621 
622         if (mdb->size >= max) {
623                 max *= 2;
624                 if (unlikely(max > br->hash_max)) {
625                         br_warn(br, "Multicast hash table maximum of %d "
626                                 "reached, disabling snooping: %s\n",
627                                 br->hash_max,
628                                 port ? port->dev->name : br->dev->name);
629                         err = -E2BIG;
630 disable:
631                         br->multicast_disabled = 1;
632                         goto err;
633                 }
634         }
635 
636         if (max > mdb->max || elasticity) {
637                 if (mdb->old) {
638                         if (net_ratelimit())
639                                 br_info(br, "Multicast hash table "
640                                         "on fire: %s\n",
641                                         port ? port->dev->name : br->dev->name);
642                         err = -EEXIST;
643                         goto err;
644                 }
645 
646                 err = br_mdb_rehash(&br->mdb, max, elasticity);
647                 if (err) {
648                         br_warn(br, "Cannot rehash multicast "
649                                 "hash table, disabling snooping: %s, %d, %d\n",
650                                 port ? port->dev->name : br->dev->name,
651                                 mdb->size, err);
652                         goto disable;
653                 }
654 
655                 err = -EAGAIN;
656                 goto err;
657         }
658 
659         return NULL;
660 
661 err:
662         mp = ERR_PTR(err);
663         return mp;
664 }
665 
666 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
667                                                     struct net_bridge_port *p,
668                                                     struct br_ip *group)
669 {
670         struct net_bridge_mdb_htable *mdb;
671         struct net_bridge_mdb_entry *mp;
672         int hash;
673         int err;
674 
675         mdb = rcu_dereference_protected(br->mdb, 1);
676         if (!mdb) {
677                 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
678                 if (err)
679                         return ERR_PTR(err);
680                 goto rehash;
681         }
682 
683         hash = br_ip_hash(mdb, group);
684         mp = br_multicast_get_group(br, p, group, hash);
685         switch (PTR_ERR(mp)) {
686         case 0:
687                 break;
688 
689         case -EAGAIN:
690 rehash:
691                 mdb = rcu_dereference_protected(br->mdb, 1);
692                 hash = br_ip_hash(mdb, group);
693                 break;
694 
695         default:
696                 goto out;
697         }
698 
699         mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
700         if (unlikely(!mp))
701                 return ERR_PTR(-ENOMEM);
702 
703         mp->br = br;
704         mp->addr = *group;
705         timer_setup(&mp->timer, br_multicast_group_expired, 0);
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         timer_setup(&p->timer, br_multicast_port_group_expired, 0);
733 
734         if (src)
735                 memcpy(p->eth_addr, src, ETH_ALEN);
736         else
737                 memset(p->eth_addr, 0xff, ETH_ALEN);
738 
739         return p;
740 }
741 
742 static bool br_port_group_equal(struct net_bridge_port_group *p,
743                                 struct net_bridge_port *port,
744                                 const unsigned char *src)
745 {
746         if (p->port != port)
747                 return false;
748 
749         if (!(port->flags & BR_MULTICAST_TO_UNICAST))
750                 return true;
751 
752         return ether_addr_equal(src, p->eth_addr);
753 }
754 
755 static int br_multicast_add_group(struct net_bridge *br,
756                                   struct net_bridge_port *port,
757                                   struct br_ip *group,
758                                   const unsigned char *src)
759 {
760         struct net_bridge_port_group __rcu **pp;
761         struct net_bridge_port_group *p;
762         struct net_bridge_mdb_entry *mp;
763         unsigned long now = jiffies;
764         int err;
765 
766         spin_lock(&br->multicast_lock);
767         if (!netif_running(br->dev) ||
768             (port && port->state == BR_STATE_DISABLED))
769                 goto out;
770 
771         mp = br_multicast_new_group(br, port, group);
772         err = PTR_ERR(mp);
773         if (IS_ERR(mp))
774                 goto err;
775 
776         if (!port) {
777                 if (!mp->host_joined) {
778                         mp->host_joined = true;
779                         br_mdb_notify(br->dev, NULL, &mp->addr, RTM_NEWMDB, 0);
780                 }
781                 mod_timer(&mp->timer, now + br->multicast_membership_interval);
782                 goto out;
783         }
784 
785         for (pp = &mp->ports;
786              (p = mlock_dereference(*pp, br)) != NULL;
787              pp = &p->next) {
788                 if (br_port_group_equal(p, port, src))
789                         goto found;
790                 if ((unsigned long)p->port < (unsigned long)port)
791                         break;
792         }
793 
794         p = br_multicast_new_port_group(port, group, *pp, 0, src);
795         if (unlikely(!p))
796                 goto err;
797         rcu_assign_pointer(*pp, p);
798         br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
799 
800 found:
801         mod_timer(&p->timer, now + br->multicast_membership_interval);
802 out:
803         err = 0;
804 
805 err:
806         spin_unlock(&br->multicast_lock);
807         return err;
808 }
809 
810 static int br_ip4_multicast_add_group(struct net_bridge *br,
811                                       struct net_bridge_port *port,
812                                       __be32 group,
813                                       __u16 vid,
814                                       const unsigned char *src)
815 {
816         struct br_ip br_group;
817 
818         if (ipv4_is_local_multicast(group))
819                 return 0;
820 
821         br_group.u.ip4 = group;
822         br_group.proto = htons(ETH_P_IP);
823         br_group.vid = vid;
824 
825         return br_multicast_add_group(br, port, &br_group, src);
826 }
827 
828 #if IS_ENABLED(CONFIG_IPV6)
829 static int br_ip6_multicast_add_group(struct net_bridge *br,
830                                       struct net_bridge_port *port,
831                                       const struct in6_addr *group,
832                                       __u16 vid,
833                                       const unsigned char *src)
834 {
835         struct br_ip br_group;
836 
837         if (ipv6_addr_is_ll_all_nodes(group))
838                 return 0;
839 
840         br_group.u.ip6 = *group;
841         br_group.proto = htons(ETH_P_IPV6);
842         br_group.vid = vid;
843 
844         return br_multicast_add_group(br, port, &br_group, src);
845 }
846 #endif
847 
848 static void br_multicast_router_expired(struct timer_list *t)
849 {
850         struct net_bridge_port *port =
851                         from_timer(port, t, multicast_router_timer);
852         struct net_bridge *br = port->br;
853 
854         spin_lock(&br->multicast_lock);
855         if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
856             port->multicast_router == MDB_RTR_TYPE_PERM ||
857             timer_pending(&port->multicast_router_timer))
858                 goto out;
859 
860         __del_port_router(port);
861 out:
862         spin_unlock(&br->multicast_lock);
863 }
864 
865 static void br_mc_router_state_change(struct net_bridge *p,
866                                       bool is_mc_router)
867 {
868         struct switchdev_attr attr = {
869                 .orig_dev = p->dev,
870                 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
871                 .flags = SWITCHDEV_F_DEFER,
872                 .u.mrouter = is_mc_router,
873         };
874 
875         switchdev_port_attr_set(p->dev, &attr);
876 }
877 
878 static void br_multicast_local_router_expired(struct timer_list *t)
879 {
880         struct net_bridge *br = from_timer(br, t, multicast_router_timer);
881 
882         spin_lock(&br->multicast_lock);
883         if (br->multicast_router == MDB_RTR_TYPE_DISABLED ||
884             br->multicast_router == MDB_RTR_TYPE_PERM ||
885             timer_pending(&br->multicast_router_timer))
886                 goto out;
887 
888         br_mc_router_state_change(br, false);
889 out:
890         spin_unlock(&br->multicast_lock);
891 }
892 
893 static void br_multicast_querier_expired(struct net_bridge *br,
894                                          struct bridge_mcast_own_query *query)
895 {
896         spin_lock(&br->multicast_lock);
897         if (!netif_running(br->dev) || br->multicast_disabled)
898                 goto out;
899 
900         br_multicast_start_querier(br, query);
901 
902 out:
903         spin_unlock(&br->multicast_lock);
904 }
905 
906 static void br_ip4_multicast_querier_expired(struct timer_list *t)
907 {
908         struct net_bridge *br = from_timer(br, t, ip4_other_query.timer);
909 
910         br_multicast_querier_expired(br, &br->ip4_own_query);
911 }
912 
913 #if IS_ENABLED(CONFIG_IPV6)
914 static void br_ip6_multicast_querier_expired(struct timer_list *t)
915 {
916         struct net_bridge *br = from_timer(br, t, ip6_other_query.timer);
917 
918         br_multicast_querier_expired(br, &br->ip6_own_query);
919 }
920 #endif
921 
922 static void br_multicast_select_own_querier(struct net_bridge *br,
923                                             struct br_ip *ip,
924                                             struct sk_buff *skb)
925 {
926         if (ip->proto == htons(ETH_P_IP))
927                 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
928 #if IS_ENABLED(CONFIG_IPV6)
929         else
930                 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
931 #endif
932 }
933 
934 static void __br_multicast_send_query(struct net_bridge *br,
935                                       struct net_bridge_port *port,
936                                       struct br_ip *ip)
937 {
938         struct sk_buff *skb;
939         u8 igmp_type;
940 
941         skb = br_multicast_alloc_query(br, ip, &igmp_type);
942         if (!skb)
943                 return;
944 
945         if (port) {
946                 skb->dev = port->dev;
947                 br_multicast_count(br, port, skb, igmp_type,
948                                    BR_MCAST_DIR_TX);
949                 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
950                         dev_net(port->dev), NULL, skb, NULL, skb->dev,
951                         br_dev_queue_push_xmit);
952         } else {
953                 br_multicast_select_own_querier(br, ip, skb);
954                 br_multicast_count(br, port, skb, igmp_type,
955                                    BR_MCAST_DIR_RX);
956                 netif_rx(skb);
957         }
958 }
959 
960 static void br_multicast_send_query(struct net_bridge *br,
961                                     struct net_bridge_port *port,
962                                     struct bridge_mcast_own_query *own_query)
963 {
964         struct bridge_mcast_other_query *other_query = NULL;
965         struct br_ip br_group;
966         unsigned long time;
967 
968         if (!netif_running(br->dev) || br->multicast_disabled ||
969             !br->multicast_querier)
970                 return;
971 
972         memset(&br_group.u, 0, sizeof(br_group.u));
973 
974         if (port ? (own_query == &port->ip4_own_query) :
975                    (own_query == &br->ip4_own_query)) {
976                 other_query = &br->ip4_other_query;
977                 br_group.proto = htons(ETH_P_IP);
978 #if IS_ENABLED(CONFIG_IPV6)
979         } else {
980                 other_query = &br->ip6_other_query;
981                 br_group.proto = htons(ETH_P_IPV6);
982 #endif
983         }
984 
985         if (!other_query || timer_pending(&other_query->timer))
986                 return;
987 
988         __br_multicast_send_query(br, port, &br_group);
989 
990         time = jiffies;
991         time += own_query->startup_sent < br->multicast_startup_query_count ?
992                 br->multicast_startup_query_interval :
993                 br->multicast_query_interval;
994         mod_timer(&own_query->timer, time);
995 }
996 
997 static void
998 br_multicast_port_query_expired(struct net_bridge_port *port,
999                                 struct bridge_mcast_own_query *query)
1000 {
1001         struct net_bridge *br = port->br;
1002 
1003         spin_lock(&br->multicast_lock);
1004         if (port->state == BR_STATE_DISABLED ||
1005             port->state == BR_STATE_BLOCKING)
1006                 goto out;
1007 
1008         if (query->startup_sent < br->multicast_startup_query_count)
1009                 query->startup_sent++;
1010 
1011         br_multicast_send_query(port->br, port, query);
1012 
1013 out:
1014         spin_unlock(&br->multicast_lock);
1015 }
1016 
1017 static void br_ip4_multicast_port_query_expired(struct timer_list *t)
1018 {
1019         struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer);
1020 
1021         br_multicast_port_query_expired(port, &port->ip4_own_query);
1022 }
1023 
1024 #if IS_ENABLED(CONFIG_IPV6)
1025 static void br_ip6_multicast_port_query_expired(struct timer_list *t)
1026 {
1027         struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer);
1028 
1029         br_multicast_port_query_expired(port, &port->ip6_own_query);
1030 }
1031 #endif
1032 
1033 static void br_mc_disabled_update(struct net_device *dev, bool value)
1034 {
1035         struct switchdev_attr attr = {
1036                 .orig_dev = dev,
1037                 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
1038                 .flags = SWITCHDEV_F_DEFER,
1039                 .u.mc_disabled = value,
1040         };
1041 
1042         switchdev_port_attr_set(dev, &attr);
1043 }
1044 
1045 int br_multicast_add_port(struct net_bridge_port *port)
1046 {
1047         port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1048 
1049         timer_setup(&port->multicast_router_timer,
1050                     br_multicast_router_expired, 0);
1051         timer_setup(&port->ip4_own_query.timer,
1052                     br_ip4_multicast_port_query_expired, 0);
1053 #if IS_ENABLED(CONFIG_IPV6)
1054         timer_setup(&port->ip6_own_query.timer,
1055                     br_ip6_multicast_port_query_expired, 0);
1056 #endif
1057         br_mc_disabled_update(port->dev, port->br->multicast_disabled);
1058 
1059         port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
1060         if (!port->mcast_stats)
1061                 return -ENOMEM;
1062 
1063         return 0;
1064 }
1065 
1066 void br_multicast_del_port(struct net_bridge_port *port)
1067 {
1068         struct net_bridge *br = port->br;
1069         struct net_bridge_port_group *pg;
1070         struct hlist_node *n;
1071 
1072         /* Take care of the remaining groups, only perm ones should be left */
1073         spin_lock_bh(&br->multicast_lock);
1074         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1075                 br_multicast_del_pg(br, pg);
1076         spin_unlock_bh(&br->multicast_lock);
1077         del_timer_sync(&port->multicast_router_timer);
1078         free_percpu(port->mcast_stats);
1079 }
1080 
1081 static void br_multicast_enable(struct bridge_mcast_own_query *query)
1082 {
1083         query->startup_sent = 0;
1084 
1085         if (try_to_del_timer_sync(&query->timer) >= 0 ||
1086             del_timer(&query->timer))
1087                 mod_timer(&query->timer, jiffies);
1088 }
1089 
1090 static void __br_multicast_enable_port(struct net_bridge_port *port)
1091 {
1092         struct net_bridge *br = port->br;
1093 
1094         if (br->multicast_disabled || !netif_running(br->dev))
1095                 return;
1096 
1097         br_multicast_enable(&port->ip4_own_query);
1098 #if IS_ENABLED(CONFIG_IPV6)
1099         br_multicast_enable(&port->ip6_own_query);
1100 #endif
1101         if (port->multicast_router == MDB_RTR_TYPE_PERM &&
1102             hlist_unhashed(&port->rlist))
1103                 br_multicast_add_router(br, port);
1104 }
1105 
1106 void br_multicast_enable_port(struct net_bridge_port *port)
1107 {
1108         struct net_bridge *br = port->br;
1109 
1110         spin_lock(&br->multicast_lock);
1111         __br_multicast_enable_port(port);
1112         spin_unlock(&br->multicast_lock);
1113 }
1114 
1115 void br_multicast_disable_port(struct net_bridge_port *port)
1116 {
1117         struct net_bridge *br = port->br;
1118         struct net_bridge_port_group *pg;
1119         struct hlist_node *n;
1120 
1121         spin_lock(&br->multicast_lock);
1122         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1123                 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
1124                         br_multicast_del_pg(br, pg);
1125 
1126         __del_port_router(port);
1127 
1128         del_timer(&port->multicast_router_timer);
1129         del_timer(&port->ip4_own_query.timer);
1130 #if IS_ENABLED(CONFIG_IPV6)
1131         del_timer(&port->ip6_own_query.timer);
1132 #endif
1133         spin_unlock(&br->multicast_lock);
1134 }
1135 
1136 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1137                                          struct net_bridge_port *port,
1138                                          struct sk_buff *skb,
1139                                          u16 vid)
1140 {
1141         const unsigned char *src;
1142         struct igmpv3_report *ih;
1143         struct igmpv3_grec *grec;
1144         int i;
1145         int len;
1146         int num;
1147         int type;
1148         int err = 0;
1149         __be32 group;
1150 
1151         ih = igmpv3_report_hdr(skb);
1152         num = ntohs(ih->ngrec);
1153         len = skb_transport_offset(skb) + sizeof(*ih);
1154 
1155         for (i = 0; i < num; i++) {
1156                 len += sizeof(*grec);
1157                 if (!pskb_may_pull(skb, len))
1158                         return -EINVAL;
1159 
1160                 grec = (void *)(skb->data + len - sizeof(*grec));
1161                 group = grec->grec_mca;
1162                 type = grec->grec_type;
1163 
1164                 len += ntohs(grec->grec_nsrcs) * 4;
1165                 if (!pskb_may_pull(skb, len))
1166                         return -EINVAL;
1167 
1168                 /* We treat this as an IGMPv2 report for now. */
1169                 switch (type) {
1170                 case IGMPV3_MODE_IS_INCLUDE:
1171                 case IGMPV3_MODE_IS_EXCLUDE:
1172                 case IGMPV3_CHANGE_TO_INCLUDE:
1173                 case IGMPV3_CHANGE_TO_EXCLUDE:
1174                 case IGMPV3_ALLOW_NEW_SOURCES:
1175                 case IGMPV3_BLOCK_OLD_SOURCES:
1176                         break;
1177 
1178                 default:
1179                         continue;
1180                 }
1181 
1182                 src = eth_hdr(skb)->h_source;
1183                 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1184                      type == IGMPV3_MODE_IS_INCLUDE) &&
1185                     ntohs(grec->grec_nsrcs) == 0) {
1186                         br_ip4_multicast_leave_group(br, port, group, vid, src);
1187                 } else {
1188                         err = br_ip4_multicast_add_group(br, port, group, vid,
1189                                                          src);
1190                         if (err)
1191                                 break;
1192                 }
1193         }
1194 
1195         return err;
1196 }
1197 
1198 #if IS_ENABLED(CONFIG_IPV6)
1199 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1200                                         struct net_bridge_port *port,
1201                                         struct sk_buff *skb,
1202                                         u16 vid)
1203 {
1204         const unsigned char *src;
1205         struct icmp6hdr *icmp6h;
1206         struct mld2_grec *grec;
1207         int i;
1208         int len;
1209         int num;
1210         int err = 0;
1211 
1212         if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1213                 return -EINVAL;
1214 
1215         icmp6h = icmp6_hdr(skb);
1216         num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1217         len = skb_transport_offset(skb) + sizeof(*icmp6h);
1218 
1219         for (i = 0; i < num; i++) {
1220                 __be16 *nsrcs, _nsrcs;
1221 
1222                 nsrcs = skb_header_pointer(skb,
1223                                            len + offsetof(struct mld2_grec,
1224                                                           grec_nsrcs),
1225                                            sizeof(_nsrcs), &_nsrcs);
1226                 if (!nsrcs)
1227                         return -EINVAL;
1228 
1229                 if (!pskb_may_pull(skb,
1230                                    len + sizeof(*grec) +
1231                                    sizeof(struct in6_addr) * ntohs(*nsrcs)))
1232                         return -EINVAL;
1233 
1234                 grec = (struct mld2_grec *)(skb->data + len);
1235                 len += sizeof(*grec) +
1236                        sizeof(struct in6_addr) * ntohs(*nsrcs);
1237 
1238                 /* We treat these as MLDv1 reports for now. */
1239                 switch (grec->grec_type) {
1240                 case MLD2_MODE_IS_INCLUDE:
1241                 case MLD2_MODE_IS_EXCLUDE:
1242                 case MLD2_CHANGE_TO_INCLUDE:
1243                 case MLD2_CHANGE_TO_EXCLUDE:
1244                 case MLD2_ALLOW_NEW_SOURCES:
1245                 case MLD2_BLOCK_OLD_SOURCES:
1246                         break;
1247 
1248                 default:
1249                         continue;
1250                 }
1251 
1252                 src = eth_hdr(skb)->h_source;
1253                 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1254                      grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1255                     ntohs(*nsrcs) == 0) {
1256                         br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1257                                                      vid, src);
1258                 } else {
1259                         err = br_ip6_multicast_add_group(br, port,
1260                                                          &grec->grec_mca, vid,
1261                                                          src);
1262                         if (err)
1263                                 break;
1264                 }
1265         }
1266 
1267         return err;
1268 }
1269 #endif
1270 
1271 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1272                                             struct net_bridge_port *port,
1273                                             __be32 saddr)
1274 {
1275         if (!timer_pending(&br->ip4_own_query.timer) &&
1276             !timer_pending(&br->ip4_other_query.timer))
1277                 goto update;
1278 
1279         if (!br->ip4_querier.addr.u.ip4)
1280                 goto update;
1281 
1282         if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1283                 goto update;
1284 
1285         return false;
1286 
1287 update:
1288         br->ip4_querier.addr.u.ip4 = saddr;
1289 
1290         /* update protected by general multicast_lock by caller */
1291         rcu_assign_pointer(br->ip4_querier.port, port);
1292 
1293         return true;
1294 }
1295 
1296 #if IS_ENABLED(CONFIG_IPV6)
1297 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1298                                             struct net_bridge_port *port,
1299                                             struct in6_addr *saddr)
1300 {
1301         if (!timer_pending(&br->ip6_own_query.timer) &&
1302             !timer_pending(&br->ip6_other_query.timer))
1303                 goto update;
1304 
1305         if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1306                 goto update;
1307 
1308         return false;
1309 
1310 update:
1311         br->ip6_querier.addr.u.ip6 = *saddr;
1312 
1313         /* update protected by general multicast_lock by caller */
1314         rcu_assign_pointer(br->ip6_querier.port, port);
1315 
1316         return true;
1317 }
1318 #endif
1319 
1320 static bool br_multicast_select_querier(struct net_bridge *br,
1321                                         struct net_bridge_port *port,
1322                                         struct br_ip *saddr)
1323 {
1324         switch (saddr->proto) {
1325         case htons(ETH_P_IP):
1326                 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1327 #if IS_ENABLED(CONFIG_IPV6)
1328         case htons(ETH_P_IPV6):
1329                 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1330 #endif
1331         }
1332 
1333         return false;
1334 }
1335 
1336 static void
1337 br_multicast_update_query_timer(struct net_bridge *br,
1338                                 struct bridge_mcast_other_query *query,
1339                                 unsigned long max_delay)
1340 {
1341         if (!timer_pending(&query->timer))
1342                 query->delay_time = jiffies + max_delay;
1343 
1344         mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1345 }
1346 
1347 static void br_port_mc_router_state_change(struct net_bridge_port *p,
1348                                            bool is_mc_router)
1349 {
1350         struct switchdev_attr attr = {
1351                 .orig_dev = p->dev,
1352                 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
1353                 .flags = SWITCHDEV_F_DEFER,
1354                 .u.mrouter = is_mc_router,
1355         };
1356 
1357         switchdev_port_attr_set(p->dev, &attr);
1358 }
1359 
1360 /*
1361  * Add port to router_list
1362  *  list is maintained ordered by pointer value
1363  *  and locked by br->multicast_lock and RCU
1364  */
1365 static void br_multicast_add_router(struct net_bridge *br,
1366                                     struct net_bridge_port *port)
1367 {
1368         struct net_bridge_port *p;
1369         struct hlist_node *slot = NULL;
1370 
1371         if (!hlist_unhashed(&port->rlist))
1372                 return;
1373 
1374         hlist_for_each_entry(p, &br->router_list, rlist) {
1375                 if ((unsigned long) port >= (unsigned long) p)
1376                         break;
1377                 slot = &p->rlist;
1378         }
1379 
1380         if (slot)
1381                 hlist_add_behind_rcu(&port->rlist, slot);
1382         else
1383                 hlist_add_head_rcu(&port->rlist, &br->router_list);
1384         br_rtr_notify(br->dev, port, RTM_NEWMDB);
1385         br_port_mc_router_state_change(port, true);
1386 }
1387 
1388 static void br_multicast_mark_router(struct net_bridge *br,
1389                                      struct net_bridge_port *port)
1390 {
1391         unsigned long now = jiffies;
1392 
1393         if (!port) {
1394                 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
1395                         if (!timer_pending(&br->multicast_router_timer))
1396                                 br_mc_router_state_change(br, true);
1397                         mod_timer(&br->multicast_router_timer,
1398                                   now + br->multicast_querier_interval);
1399                 }
1400                 return;
1401         }
1402 
1403         if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1404             port->multicast_router == MDB_RTR_TYPE_PERM)
1405                 return;
1406 
1407         br_multicast_add_router(br, port);
1408 
1409         mod_timer(&port->multicast_router_timer,
1410                   now + br->multicast_querier_interval);
1411 }
1412 
1413 static void br_multicast_query_received(struct net_bridge *br,
1414                                         struct net_bridge_port *port,
1415                                         struct bridge_mcast_other_query *query,
1416                                         struct br_ip *saddr,
1417                                         unsigned long max_delay)
1418 {
1419         if (!br_multicast_select_querier(br, port, saddr))
1420                 return;
1421 
1422         br_multicast_update_query_timer(br, query, max_delay);
1423         br_multicast_mark_router(br, port);
1424 }
1425 
1426 static int br_ip4_multicast_query(struct net_bridge *br,
1427                                   struct net_bridge_port *port,
1428                                   struct sk_buff *skb,
1429                                   u16 vid)
1430 {
1431         const struct iphdr *iph = ip_hdr(skb);
1432         struct igmphdr *ih = igmp_hdr(skb);
1433         struct net_bridge_mdb_entry *mp;
1434         struct igmpv3_query *ih3;
1435         struct net_bridge_port_group *p;
1436         struct net_bridge_port_group __rcu **pp;
1437         struct br_ip saddr;
1438         unsigned long max_delay;
1439         unsigned long now = jiffies;
1440         unsigned int offset = skb_transport_offset(skb);
1441         __be32 group;
1442         int err = 0;
1443 
1444         spin_lock(&br->multicast_lock);
1445         if (!netif_running(br->dev) ||
1446             (port && port->state == BR_STATE_DISABLED))
1447                 goto out;
1448 
1449         group = ih->group;
1450 
1451         if (skb->len == offset + sizeof(*ih)) {
1452                 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1453 
1454                 if (!max_delay) {
1455                         max_delay = 10 * HZ;
1456                         group = 0;
1457                 }
1458         } else if (skb->len >= offset + sizeof(*ih3)) {
1459                 ih3 = igmpv3_query_hdr(skb);
1460                 if (ih3->nsrcs)
1461                         goto out;
1462 
1463                 max_delay = ih3->code ?
1464                             IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1465         } else {
1466                 goto out;
1467         }
1468 
1469         if (!group) {
1470                 saddr.proto = htons(ETH_P_IP);
1471                 saddr.u.ip4 = iph->saddr;
1472 
1473                 br_multicast_query_received(br, port, &br->ip4_other_query,
1474                                             &saddr, max_delay);
1475                 goto out;
1476         }
1477 
1478         mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1479         if (!mp)
1480                 goto out;
1481 
1482         max_delay *= br->multicast_last_member_count;
1483 
1484         if (mp->host_joined &&
1485             (timer_pending(&mp->timer) ?
1486              time_after(mp->timer.expires, now + max_delay) :
1487              try_to_del_timer_sync(&mp->timer) >= 0))
1488                 mod_timer(&mp->timer, now + max_delay);
1489 
1490         for (pp = &mp->ports;
1491              (p = mlock_dereference(*pp, br)) != NULL;
1492              pp = &p->next) {
1493                 if (timer_pending(&p->timer) ?
1494                     time_after(p->timer.expires, now + max_delay) :
1495                     try_to_del_timer_sync(&p->timer) >= 0)
1496                         mod_timer(&p->timer, now + max_delay);
1497         }
1498 
1499 out:
1500         spin_unlock(&br->multicast_lock);
1501         return err;
1502 }
1503 
1504 #if IS_ENABLED(CONFIG_IPV6)
1505 static int br_ip6_multicast_query(struct net_bridge *br,
1506                                   struct net_bridge_port *port,
1507                                   struct sk_buff *skb,
1508                                   u16 vid)
1509 {
1510         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1511         struct mld_msg *mld;
1512         struct net_bridge_mdb_entry *mp;
1513         struct mld2_query *mld2q;
1514         struct net_bridge_port_group *p;
1515         struct net_bridge_port_group __rcu **pp;
1516         struct br_ip saddr;
1517         unsigned long max_delay;
1518         unsigned long now = jiffies;
1519         unsigned int offset = skb_transport_offset(skb);
1520         const struct in6_addr *group = NULL;
1521         bool is_general_query;
1522         int err = 0;
1523 
1524         spin_lock(&br->multicast_lock);
1525         if (!netif_running(br->dev) ||
1526             (port && port->state == BR_STATE_DISABLED))
1527                 goto out;
1528 
1529         if (skb->len == offset + sizeof(*mld)) {
1530                 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1531                         err = -EINVAL;
1532                         goto out;
1533                 }
1534                 mld = (struct mld_msg *) icmp6_hdr(skb);
1535                 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1536                 if (max_delay)
1537                         group = &mld->mld_mca;
1538         } else {
1539                 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1540                         err = -EINVAL;
1541                         goto out;
1542                 }
1543                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1544                 if (!mld2q->mld2q_nsrcs)
1545                         group = &mld2q->mld2q_mca;
1546 
1547                 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1548         }
1549 
1550         is_general_query = group && ipv6_addr_any(group);
1551 
1552         if (is_general_query) {
1553                 saddr.proto = htons(ETH_P_IPV6);
1554                 saddr.u.ip6 = ip6h->saddr;
1555 
1556                 br_multicast_query_received(br, port, &br->ip6_other_query,
1557                                             &saddr, max_delay);
1558                 goto out;
1559         } else if (!group) {
1560                 goto out;
1561         }
1562 
1563         mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1564         if (!mp)
1565                 goto out;
1566 
1567         max_delay *= br->multicast_last_member_count;
1568         if (mp->host_joined &&
1569             (timer_pending(&mp->timer) ?
1570              time_after(mp->timer.expires, now + max_delay) :
1571              try_to_del_timer_sync(&mp->timer) >= 0))
1572                 mod_timer(&mp->timer, now + max_delay);
1573 
1574         for (pp = &mp->ports;
1575              (p = mlock_dereference(*pp, br)) != NULL;
1576              pp = &p->next) {
1577                 if (timer_pending(&p->timer) ?
1578                     time_after(p->timer.expires, now + max_delay) :
1579                     try_to_del_timer_sync(&p->timer) >= 0)
1580                         mod_timer(&p->timer, now + max_delay);
1581         }
1582 
1583 out:
1584         spin_unlock(&br->multicast_lock);
1585         return err;
1586 }
1587 #endif
1588 
1589 static void
1590 br_multicast_leave_group(struct net_bridge *br,
1591                          struct net_bridge_port *port,
1592                          struct br_ip *group,
1593                          struct bridge_mcast_other_query *other_query,
1594                          struct bridge_mcast_own_query *own_query,
1595                          const unsigned char *src)
1596 {
1597         struct net_bridge_mdb_htable *mdb;
1598         struct net_bridge_mdb_entry *mp;
1599         struct net_bridge_port_group *p;
1600         unsigned long now;
1601         unsigned long time;
1602 
1603         spin_lock(&br->multicast_lock);
1604         if (!netif_running(br->dev) ||
1605             (port && port->state == BR_STATE_DISABLED))
1606                 goto out;
1607 
1608         mdb = mlock_dereference(br->mdb, br);
1609         mp = br_mdb_ip_get(mdb, group);
1610         if (!mp)
1611                 goto out;
1612 
1613         if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1614                 struct net_bridge_port_group __rcu **pp;
1615 
1616                 for (pp = &mp->ports;
1617                      (p = mlock_dereference(*pp, br)) != NULL;
1618                      pp = &p->next) {
1619                         if (!br_port_group_equal(p, port, src))
1620                                 continue;
1621 
1622                         rcu_assign_pointer(*pp, p->next);
1623                         hlist_del_init(&p->mglist);
1624                         del_timer(&p->timer);
1625                         call_rcu_bh(&p->rcu, br_multicast_free_pg);
1626                         br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1627                                       p->flags);
1628 
1629                         if (!mp->ports && !mp->host_joined &&
1630                             netif_running(br->dev))
1631                                 mod_timer(&mp->timer, jiffies);
1632                 }
1633                 goto out;
1634         }
1635 
1636         if (timer_pending(&other_query->timer))
1637                 goto out;
1638 
1639         if (br->multicast_querier) {
1640                 __br_multicast_send_query(br, port, &mp->addr);
1641 
1642                 time = jiffies + br->multicast_last_member_count *
1643                                  br->multicast_last_member_interval;
1644 
1645                 mod_timer(&own_query->timer, time);
1646 
1647                 for (p = mlock_dereference(mp->ports, br);
1648                      p != NULL;
1649                      p = mlock_dereference(p->next, br)) {
1650                         if (!br_port_group_equal(p, port, src))
1651                                 continue;
1652 
1653                         if (!hlist_unhashed(&p->mglist) &&
1654                             (timer_pending(&p->timer) ?
1655                              time_after(p->timer.expires, time) :
1656                              try_to_del_timer_sync(&p->timer) >= 0)) {
1657                                 mod_timer(&p->timer, time);
1658                         }
1659 
1660                         break;
1661                 }
1662         }
1663 
1664         now = jiffies;
1665         time = now + br->multicast_last_member_count *
1666                      br->multicast_last_member_interval;
1667 
1668         if (!port) {
1669                 if (mp->host_joined &&
1670                     (timer_pending(&mp->timer) ?
1671                      time_after(mp->timer.expires, time) :
1672                      try_to_del_timer_sync(&mp->timer) >= 0)) {
1673                         mod_timer(&mp->timer, time);
1674                 }
1675 
1676                 goto out;
1677         }
1678 
1679         for (p = mlock_dereference(mp->ports, br);
1680              p != NULL;
1681              p = mlock_dereference(p->next, br)) {
1682                 if (p->port != port)
1683                         continue;
1684 
1685                 if (!hlist_unhashed(&p->mglist) &&
1686                     (timer_pending(&p->timer) ?
1687                      time_after(p->timer.expires, time) :
1688                      try_to_del_timer_sync(&p->timer) >= 0)) {
1689                         mod_timer(&p->timer, time);
1690                 }
1691 
1692                 break;
1693         }
1694 out:
1695         spin_unlock(&br->multicast_lock);
1696 }
1697 
1698 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1699                                          struct net_bridge_port *port,
1700                                          __be32 group,
1701                                          __u16 vid,
1702                                          const unsigned char *src)
1703 {
1704         struct br_ip br_group;
1705         struct bridge_mcast_own_query *own_query;
1706 
1707         if (ipv4_is_local_multicast(group))
1708                 return;
1709 
1710         own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1711 
1712         br_group.u.ip4 = group;
1713         br_group.proto = htons(ETH_P_IP);
1714         br_group.vid = vid;
1715 
1716         br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1717                                  own_query, src);
1718 }
1719 
1720 #if IS_ENABLED(CONFIG_IPV6)
1721 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1722                                          struct net_bridge_port *port,
1723                                          const struct in6_addr *group,
1724                                          __u16 vid,
1725                                          const unsigned char *src)
1726 {
1727         struct br_ip br_group;
1728         struct bridge_mcast_own_query *own_query;
1729 
1730         if (ipv6_addr_is_ll_all_nodes(group))
1731                 return;
1732 
1733         own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1734 
1735         br_group.u.ip6 = *group;
1736         br_group.proto = htons(ETH_P_IPV6);
1737         br_group.vid = vid;
1738 
1739         br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1740                                  own_query, src);
1741 }
1742 #endif
1743 
1744 static void br_multicast_err_count(const struct net_bridge *br,
1745                                    const struct net_bridge_port *p,
1746                                    __be16 proto)
1747 {
1748         struct bridge_mcast_stats __percpu *stats;
1749         struct bridge_mcast_stats *pstats;
1750 
1751         if (!br->multicast_stats_enabled)
1752                 return;
1753 
1754         if (p)
1755                 stats = p->mcast_stats;
1756         else
1757                 stats = br->mcast_stats;
1758         if (WARN_ON(!stats))
1759                 return;
1760 
1761         pstats = this_cpu_ptr(stats);
1762 
1763         u64_stats_update_begin(&pstats->syncp);
1764         switch (proto) {
1765         case htons(ETH_P_IP):
1766                 pstats->mstats.igmp_parse_errors++;
1767                 break;
1768 #if IS_ENABLED(CONFIG_IPV6)
1769         case htons(ETH_P_IPV6):
1770                 pstats->mstats.mld_parse_errors++;
1771                 break;
1772 #endif
1773         }
1774         u64_stats_update_end(&pstats->syncp);
1775 }
1776 
1777 static void br_multicast_pim(struct net_bridge *br,
1778                              struct net_bridge_port *port,
1779                              const struct sk_buff *skb)
1780 {
1781         unsigned int offset = skb_transport_offset(skb);
1782         struct pimhdr *pimhdr, _pimhdr;
1783 
1784         pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1785         if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1786             pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1787                 return;
1788 
1789         br_multicast_mark_router(br, port);
1790 }
1791 
1792 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1793                                  struct net_bridge_port *port,
1794                                  struct sk_buff *skb,
1795                                  u16 vid)
1796 {
1797         struct sk_buff *skb_trimmed = NULL;
1798         const unsigned char *src;
1799         struct igmphdr *ih;
1800         int err;
1801 
1802         err = ip_mc_check_igmp(skb, &skb_trimmed);
1803 
1804         if (err == -ENOMSG) {
1805                 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
1806                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1807                 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1808                         if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1809                                 br_multicast_pim(br, port, skb);
1810                 }
1811                 return 0;
1812         } else if (err < 0) {
1813                 br_multicast_err_count(br, port, skb->protocol);
1814                 return err;
1815         }
1816 
1817         ih = igmp_hdr(skb);
1818         src = eth_hdr(skb)->h_source;
1819         BR_INPUT_SKB_CB(skb)->igmp = ih->type;
1820 
1821         switch (ih->type) {
1822         case IGMP_HOST_MEMBERSHIP_REPORT:
1823         case IGMPV2_HOST_MEMBERSHIP_REPORT:
1824                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1825                 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
1826                 break;
1827         case IGMPV3_HOST_MEMBERSHIP_REPORT:
1828                 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1829                 break;
1830         case IGMP_HOST_MEMBERSHIP_QUERY:
1831                 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1832                 break;
1833         case IGMP_HOST_LEAVE_MESSAGE:
1834                 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
1835                 break;
1836         }
1837 
1838         if (skb_trimmed && skb_trimmed != skb)
1839                 kfree_skb(skb_trimmed);
1840 
1841         br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1842                            BR_MCAST_DIR_RX);
1843 
1844         return err;
1845 }
1846 
1847 #if IS_ENABLED(CONFIG_IPV6)
1848 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1849                                  struct net_bridge_port *port,
1850                                  struct sk_buff *skb,
1851                                  u16 vid)
1852 {
1853         struct sk_buff *skb_trimmed = NULL;
1854         const unsigned char *src;
1855         struct mld_msg *mld;
1856         int err;
1857 
1858         err = ipv6_mc_check_mld(skb, &skb_trimmed);
1859 
1860         if (err == -ENOMSG) {
1861                 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1862                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1863                 return 0;
1864         } else if (err < 0) {
1865                 br_multicast_err_count(br, port, skb->protocol);
1866                 return err;
1867         }
1868 
1869         mld = (struct mld_msg *)skb_transport_header(skb);
1870         BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
1871 
1872         switch (mld->mld_type) {
1873         case ICMPV6_MGM_REPORT:
1874                 src = eth_hdr(skb)->h_source;
1875                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1876                 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
1877                                                  src);
1878                 break;
1879         case ICMPV6_MLD2_REPORT:
1880                 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1881                 break;
1882         case ICMPV6_MGM_QUERY:
1883                 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1884                 break;
1885         case ICMPV6_MGM_REDUCTION:
1886                 src = eth_hdr(skb)->h_source;
1887                 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
1888                 break;
1889         }
1890 
1891         if (skb_trimmed && skb_trimmed != skb)
1892                 kfree_skb(skb_trimmed);
1893 
1894         br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1895                            BR_MCAST_DIR_RX);
1896 
1897         return err;
1898 }
1899 #endif
1900 
1901 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1902                      struct sk_buff *skb, u16 vid)
1903 {
1904         int ret = 0;
1905 
1906         BR_INPUT_SKB_CB(skb)->igmp = 0;
1907         BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1908 
1909         if (br->multicast_disabled)
1910                 return 0;
1911 
1912         switch (skb->protocol) {
1913         case htons(ETH_P_IP):
1914                 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1915                 break;
1916 #if IS_ENABLED(CONFIG_IPV6)
1917         case htons(ETH_P_IPV6):
1918                 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1919                 break;
1920 #endif
1921         }
1922 
1923         return ret;
1924 }
1925 
1926 static void br_multicast_query_expired(struct net_bridge *br,
1927                                        struct bridge_mcast_own_query *query,
1928                                        struct bridge_mcast_querier *querier)
1929 {
1930         spin_lock(&br->multicast_lock);
1931         if (query->startup_sent < br->multicast_startup_query_count)
1932                 query->startup_sent++;
1933 
1934         RCU_INIT_POINTER(querier->port, NULL);
1935         br_multicast_send_query(br, NULL, query);
1936         spin_unlock(&br->multicast_lock);
1937 }
1938 
1939 static void br_ip4_multicast_query_expired(struct timer_list *t)
1940 {
1941         struct net_bridge *br = from_timer(br, t, ip4_own_query.timer);
1942 
1943         br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1944 }
1945 
1946 #if IS_ENABLED(CONFIG_IPV6)
1947 static void br_ip6_multicast_query_expired(struct timer_list *t)
1948 {
1949         struct net_bridge *br = from_timer(br, t, ip6_own_query.timer);
1950 
1951         br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1952 }
1953 #endif
1954 
1955 void br_multicast_init(struct net_bridge *br)
1956 {
1957         br->hash_elasticity = 4;
1958         br->hash_max = 512;
1959 
1960         br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1961         br->multicast_querier = 0;
1962         br->multicast_query_use_ifaddr = 0;
1963         br->multicast_last_member_count = 2;
1964         br->multicast_startup_query_count = 2;
1965 
1966         br->multicast_last_member_interval = HZ;
1967         br->multicast_query_response_interval = 10 * HZ;
1968         br->multicast_startup_query_interval = 125 * HZ / 4;
1969         br->multicast_query_interval = 125 * HZ;
1970         br->multicast_querier_interval = 255 * HZ;
1971         br->multicast_membership_interval = 260 * HZ;
1972 
1973         br->ip4_other_query.delay_time = 0;
1974         br->ip4_querier.port = NULL;
1975         br->multicast_igmp_version = 2;
1976 #if IS_ENABLED(CONFIG_IPV6)
1977         br->multicast_mld_version = 1;
1978         br->ip6_other_query.delay_time = 0;
1979         br->ip6_querier.port = NULL;
1980 #endif
1981         br->has_ipv6_addr = 1;
1982 
1983         spin_lock_init(&br->multicast_lock);
1984         timer_setup(&br->multicast_router_timer,
1985                     br_multicast_local_router_expired, 0);
1986         timer_setup(&br->ip4_other_query.timer,
1987                     br_ip4_multicast_querier_expired, 0);
1988         timer_setup(&br->ip4_own_query.timer,
1989                     br_ip4_multicast_query_expired, 0);
1990 #if IS_ENABLED(CONFIG_IPV6)
1991         timer_setup(&br->ip6_other_query.timer,
1992                     br_ip6_multicast_querier_expired, 0);
1993         timer_setup(&br->ip6_own_query.timer,
1994                     br_ip6_multicast_query_expired, 0);
1995 #endif
1996 }
1997 
1998 static void __br_multicast_open(struct net_bridge *br,
1999                                 struct bridge_mcast_own_query *query)
2000 {
2001         query->startup_sent = 0;
2002 
2003         if (br->multicast_disabled)
2004                 return;
2005 
2006         mod_timer(&query->timer, jiffies);
2007 }
2008 
2009 void br_multicast_open(struct net_bridge *br)
2010 {
2011         __br_multicast_open(br, &br->ip4_own_query);
2012 #if IS_ENABLED(CONFIG_IPV6)
2013         __br_multicast_open(br, &br->ip6_own_query);
2014 #endif
2015 }
2016 
2017 void br_multicast_stop(struct net_bridge *br)
2018 {
2019         del_timer_sync(&br->multicast_router_timer);
2020         del_timer_sync(&br->ip4_other_query.timer);
2021         del_timer_sync(&br->ip4_own_query.timer);
2022 #if IS_ENABLED(CONFIG_IPV6)
2023         del_timer_sync(&br->ip6_other_query.timer);
2024         del_timer_sync(&br->ip6_own_query.timer);
2025 #endif
2026 }
2027 
2028 void br_multicast_dev_del(struct net_bridge *br)
2029 {
2030         struct net_bridge_mdb_htable *mdb;
2031         struct net_bridge_mdb_entry *mp;
2032         struct hlist_node *n;
2033         u32 ver;
2034         int i;
2035 
2036         spin_lock_bh(&br->multicast_lock);
2037         mdb = mlock_dereference(br->mdb, br);
2038         if (!mdb)
2039                 goto out;
2040 
2041         br->mdb = NULL;
2042 
2043         ver = mdb->ver;
2044         for (i = 0; i < mdb->max; i++) {
2045                 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
2046                                           hlist[ver]) {
2047                         del_timer(&mp->timer);
2048                         call_rcu_bh(&mp->rcu, br_multicast_free_group);
2049                 }
2050         }
2051 
2052         if (mdb->old) {
2053                 spin_unlock_bh(&br->multicast_lock);
2054                 rcu_barrier_bh();
2055                 spin_lock_bh(&br->multicast_lock);
2056                 WARN_ON(mdb->old);
2057         }
2058 
2059         mdb->old = mdb;
2060         call_rcu_bh(&mdb->rcu, br_mdb_free);
2061 
2062 out:
2063         spin_unlock_bh(&br->multicast_lock);
2064 }
2065 
2066 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
2067 {
2068         int err = -EINVAL;
2069 
2070         spin_lock_bh(&br->multicast_lock);
2071 
2072         switch (val) {
2073         case MDB_RTR_TYPE_DISABLED:
2074         case MDB_RTR_TYPE_PERM:
2075                 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM);
2076                 del_timer(&br->multicast_router_timer);
2077                 br->multicast_router = val;
2078                 err = 0;
2079                 break;
2080         case MDB_RTR_TYPE_TEMP_QUERY:
2081                 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
2082                         br_mc_router_state_change(br, false);
2083                 br->multicast_router = val;
2084                 err = 0;
2085                 break;
2086         }
2087 
2088         spin_unlock_bh(&br->multicast_lock);
2089 
2090         return err;
2091 }
2092 
2093 static void __del_port_router(struct net_bridge_port *p)
2094 {
2095         if (hlist_unhashed(&p->rlist))
2096                 return;
2097         hlist_del_init_rcu(&p->rlist);
2098         br_rtr_notify(p->br->dev, p, RTM_DELMDB);
2099         br_port_mc_router_state_change(p, false);
2100 
2101         /* don't allow timer refresh */
2102         if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2103                 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2104 }
2105 
2106 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
2107 {
2108         struct net_bridge *br = p->br;
2109         unsigned long now = jiffies;
2110         int err = -EINVAL;
2111 
2112         spin_lock(&br->multicast_lock);
2113         if (p->multicast_router == val) {
2114                 /* Refresh the temp router port timer */
2115                 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2116                         mod_timer(&p->multicast_router_timer,
2117                                   now + br->multicast_querier_interval);
2118                 err = 0;
2119                 goto unlock;
2120         }
2121         switch (val) {
2122         case MDB_RTR_TYPE_DISABLED:
2123                 p->multicast_router = MDB_RTR_TYPE_DISABLED;
2124                 __del_port_router(p);
2125                 del_timer(&p->multicast_router_timer);
2126                 break;
2127         case MDB_RTR_TYPE_TEMP_QUERY:
2128                 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2129                 __del_port_router(p);
2130                 break;
2131         case MDB_RTR_TYPE_PERM:
2132                 p->multicast_router = MDB_RTR_TYPE_PERM;
2133                 del_timer(&p->multicast_router_timer);
2134                 br_multicast_add_router(br, p);
2135                 break;
2136         case MDB_RTR_TYPE_TEMP:
2137                 p->multicast_router = MDB_RTR_TYPE_TEMP;
2138                 br_multicast_mark_router(br, p);
2139                 break;
2140         default:
2141                 goto unlock;
2142         }
2143         err = 0;
2144 unlock:
2145         spin_unlock(&br->multicast_lock);
2146 
2147         return err;
2148 }
2149 
2150 static void br_multicast_start_querier(struct net_bridge *br,
2151                                        struct bridge_mcast_own_query *query)
2152 {
2153         struct net_bridge_port *port;
2154 
2155         __br_multicast_open(br, query);
2156 
2157         list_for_each_entry(port, &br->port_list, list) {
2158                 if (port->state == BR_STATE_DISABLED ||
2159                     port->state == BR_STATE_BLOCKING)
2160                         continue;
2161 
2162                 if (query == &br->ip4_own_query)
2163                         br_multicast_enable(&port->ip4_own_query);
2164 #if IS_ENABLED(CONFIG_IPV6)
2165                 else
2166                         br_multicast_enable(&port->ip6_own_query);
2167 #endif
2168         }
2169 }
2170 
2171 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2172 {
2173         struct net_bridge_mdb_htable *mdb;
2174         struct net_bridge_port *port;
2175         int err = 0;
2176 
2177         spin_lock_bh(&br->multicast_lock);
2178         if (br->multicast_disabled == !val)
2179                 goto unlock;
2180 
2181         br_mc_disabled_update(br->dev, !val);
2182         br->multicast_disabled = !val;
2183         if (br->multicast_disabled)
2184                 goto unlock;
2185 
2186         if (!netif_running(br->dev))
2187                 goto unlock;
2188 
2189         mdb = mlock_dereference(br->mdb, br);
2190         if (mdb) {
2191                 if (mdb->old) {
2192                         err = -EEXIST;
2193 rollback:
2194                         br->multicast_disabled = !!val;
2195                         goto unlock;
2196                 }
2197 
2198                 err = br_mdb_rehash(&br->mdb, mdb->max,
2199                                     br->hash_elasticity);
2200                 if (err)
2201                         goto rollback;
2202         }
2203 
2204         br_multicast_open(br);
2205         list_for_each_entry(port, &br->port_list, list)
2206                 __br_multicast_enable_port(port);
2207 
2208 unlock:
2209         spin_unlock_bh(&br->multicast_lock);
2210 
2211         return err;
2212 }
2213 
2214 bool br_multicast_enabled(const struct net_device *dev)
2215 {
2216         struct net_bridge *br = netdev_priv(dev);
2217 
2218         return !br->multicast_disabled;
2219 }
2220 EXPORT_SYMBOL_GPL(br_multicast_enabled);
2221 
2222 bool br_multicast_router(const struct net_device *dev)
2223 {
2224         struct net_bridge *br = netdev_priv(dev);
2225         bool is_router;
2226 
2227         spin_lock_bh(&br->multicast_lock);
2228         is_router = br_multicast_is_router(br);
2229         spin_unlock_bh(&br->multicast_lock);
2230         return is_router;
2231 }
2232 EXPORT_SYMBOL_GPL(br_multicast_router);
2233 
2234 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2235 {
2236         unsigned long max_delay;
2237 
2238         val = !!val;
2239 
2240         spin_lock_bh(&br->multicast_lock);
2241         if (br->multicast_querier == val)
2242                 goto unlock;
2243 
2244         br->multicast_querier = val;
2245         if (!val)
2246                 goto unlock;
2247 
2248         max_delay = br->multicast_query_response_interval;
2249 
2250         if (!timer_pending(&br->ip4_other_query.timer))
2251                 br->ip4_other_query.delay_time = jiffies + max_delay;
2252 
2253         br_multicast_start_querier(br, &br->ip4_own_query);
2254 
2255 #if IS_ENABLED(CONFIG_IPV6)
2256         if (!timer_pending(&br->ip6_other_query.timer))
2257                 br->ip6_other_query.delay_time = jiffies + max_delay;
2258 
2259         br_multicast_start_querier(br, &br->ip6_own_query);
2260 #endif
2261 
2262 unlock:
2263         spin_unlock_bh(&br->multicast_lock);
2264 
2265         return 0;
2266 }
2267 
2268 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2269 {
2270         int err = -EINVAL;
2271         u32 old;
2272         struct net_bridge_mdb_htable *mdb;
2273 
2274         spin_lock_bh(&br->multicast_lock);
2275         if (!is_power_of_2(val))
2276                 goto unlock;
2277 
2278         mdb = mlock_dereference(br->mdb, br);
2279         if (mdb && val < mdb->size)
2280                 goto unlock;
2281 
2282         err = 0;
2283 
2284         old = br->hash_max;
2285         br->hash_max = val;
2286 
2287         if (mdb) {
2288                 if (mdb->old) {
2289                         err = -EEXIST;
2290 rollback:
2291                         br->hash_max = old;
2292                         goto unlock;
2293                 }
2294 
2295                 err = br_mdb_rehash(&br->mdb, br->hash_max,
2296                                     br->hash_elasticity);
2297                 if (err)
2298                         goto rollback;
2299         }
2300 
2301 unlock:
2302         spin_unlock_bh(&br->multicast_lock);
2303 
2304         return err;
2305 }
2306 
2307 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2308 {
2309         /* Currently we support only version 2 and 3 */
2310         switch (val) {
2311         case 2:
2312         case 3:
2313                 break;
2314         default:
2315                 return -EINVAL;
2316         }
2317 
2318         spin_lock_bh(&br->multicast_lock);
2319         br->multicast_igmp_version = val;
2320         spin_unlock_bh(&br->multicast_lock);
2321 
2322         return 0;
2323 }
2324 
2325 #if IS_ENABLED(CONFIG_IPV6)
2326 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2327 {
2328         /* Currently we support version 1 and 2 */
2329         switch (val) {
2330         case 1:
2331         case 2:
2332                 break;
2333         default:
2334                 return -EINVAL;
2335         }
2336 
2337         spin_lock_bh(&br->multicast_lock);
2338         br->multicast_mld_version = val;
2339         spin_unlock_bh(&br->multicast_lock);
2340 
2341         return 0;
2342 }
2343 #endif
2344 
2345 /**
2346  * br_multicast_list_adjacent - Returns snooped multicast addresses
2347  * @dev:        The bridge port adjacent to which to retrieve addresses
2348  * @br_ip_list: The list to store found, snooped multicast IP addresses in
2349  *
2350  * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2351  * snooping feature on all bridge ports of dev's bridge device, excluding
2352  * the addresses from dev itself.
2353  *
2354  * Returns the number of items added to br_ip_list.
2355  *
2356  * Notes:
2357  * - br_ip_list needs to be initialized by caller
2358  * - br_ip_list might contain duplicates in the end
2359  *   (needs to be taken care of by caller)
2360  * - br_ip_list needs to be freed by caller
2361  */
2362 int br_multicast_list_adjacent(struct net_device *dev,
2363                                struct list_head *br_ip_list)
2364 {
2365         struct net_bridge *br;
2366         struct net_bridge_port *port;
2367         struct net_bridge_port_group *group;
2368         struct br_ip_list *entry;
2369         int count = 0;
2370 
2371         rcu_read_lock();
2372         if (!br_ip_list || !br_port_exists(dev))
2373                 goto unlock;
2374 
2375         port = br_port_get_rcu(dev);
2376         if (!port || !port->br)
2377                 goto unlock;
2378 
2379         br = port->br;
2380 
2381         list_for_each_entry_rcu(port, &br->port_list, list) {
2382                 if (!port->dev || port->dev == dev)
2383                         continue;
2384 
2385                 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2386                         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2387                         if (!entry)
2388                                 goto unlock;
2389 
2390                         entry->addr = group->addr;
2391                         list_add(&entry->list, br_ip_list);
2392                         count++;
2393                 }
2394         }
2395 
2396 unlock:
2397         rcu_read_unlock();
2398         return count;
2399 }
2400 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2401 
2402 /**
2403  * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2404  * @dev: The bridge port providing the bridge on which to check for a querier
2405  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2406  *
2407  * Checks whether the given interface has a bridge on top and if so returns
2408  * true if a valid querier exists anywhere on the bridged link layer.
2409  * Otherwise returns false.
2410  */
2411 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2412 {
2413         struct net_bridge *br;
2414         struct net_bridge_port *port;
2415         struct ethhdr eth;
2416         bool ret = false;
2417 
2418         rcu_read_lock();
2419         if (!br_port_exists(dev))
2420                 goto unlock;
2421 
2422         port = br_port_get_rcu(dev);
2423         if (!port || !port->br)
2424                 goto unlock;
2425 
2426         br = port->br;
2427 
2428         memset(&eth, 0, sizeof(eth));
2429         eth.h_proto = htons(proto);
2430 
2431         ret = br_multicast_querier_exists(br, &eth);
2432 
2433 unlock:
2434         rcu_read_unlock();
2435         return ret;
2436 }
2437 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2438 
2439 /**
2440  * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2441  * @dev: The bridge port adjacent to which to check for a querier
2442  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2443  *
2444  * Checks whether the given interface has a bridge on top and if so returns
2445  * true if a selected querier is behind one of the other ports of this
2446  * bridge. Otherwise returns false.
2447  */
2448 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2449 {
2450         struct net_bridge *br;
2451         struct net_bridge_port *port;
2452         bool ret = false;
2453 
2454         rcu_read_lock();
2455         if (!br_port_exists(dev))
2456                 goto unlock;
2457 
2458         port = br_port_get_rcu(dev);
2459         if (!port || !port->br)
2460                 goto unlock;
2461 
2462         br = port->br;
2463 
2464         switch (proto) {
2465         case ETH_P_IP:
2466                 if (!timer_pending(&br->ip4_other_query.timer) ||
2467                     rcu_dereference(br->ip4_querier.port) == port)
2468                         goto unlock;
2469                 break;
2470 #if IS_ENABLED(CONFIG_IPV6)
2471         case ETH_P_IPV6:
2472                 if (!timer_pending(&br->ip6_other_query.timer) ||
2473                     rcu_dereference(br->ip6_querier.port) == port)
2474                         goto unlock;
2475                 break;
2476 #endif
2477         default:
2478                 goto unlock;
2479         }
2480 
2481         ret = true;
2482 unlock:
2483         rcu_read_unlock();
2484         return ret;
2485 }
2486 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2487 
2488 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
2489                                const struct sk_buff *skb, u8 type, u8 dir)
2490 {
2491         struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
2492         __be16 proto = skb->protocol;
2493         unsigned int t_len;
2494 
2495         u64_stats_update_begin(&pstats->syncp);
2496         switch (proto) {
2497         case htons(ETH_P_IP):
2498                 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
2499                 switch (type) {
2500                 case IGMP_HOST_MEMBERSHIP_REPORT:
2501                         pstats->mstats.igmp_v1reports[dir]++;
2502                         break;
2503                 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2504                         pstats->mstats.igmp_v2reports[dir]++;
2505                         break;
2506                 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2507                         pstats->mstats.igmp_v3reports[dir]++;
2508                         break;
2509                 case IGMP_HOST_MEMBERSHIP_QUERY:
2510                         if (t_len != sizeof(struct igmphdr)) {
2511                                 pstats->mstats.igmp_v3queries[dir]++;
2512                         } else {
2513                                 unsigned int offset = skb_transport_offset(skb);
2514                                 struct igmphdr *ih, _ihdr;
2515 
2516                                 ih = skb_header_pointer(skb, offset,
2517                                                         sizeof(_ihdr), &_ihdr);
2518                                 if (!ih)
2519                                         break;
2520                                 if (!ih->code)
2521                                         pstats->mstats.igmp_v1queries[dir]++;
2522                                 else
2523                                         pstats->mstats.igmp_v2queries[dir]++;
2524                         }
2525                         break;
2526                 case IGMP_HOST_LEAVE_MESSAGE:
2527                         pstats->mstats.igmp_leaves[dir]++;
2528                         break;
2529                 }
2530                 break;
2531 #if IS_ENABLED(CONFIG_IPV6)
2532         case htons(ETH_P_IPV6):
2533                 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2534                         sizeof(struct ipv6hdr);
2535                 t_len -= skb_network_header_len(skb);
2536                 switch (type) {
2537                 case ICMPV6_MGM_REPORT:
2538                         pstats->mstats.mld_v1reports[dir]++;
2539                         break;
2540                 case ICMPV6_MLD2_REPORT:
2541                         pstats->mstats.mld_v2reports[dir]++;
2542                         break;
2543                 case ICMPV6_MGM_QUERY:
2544                         if (t_len != sizeof(struct mld_msg))
2545                                 pstats->mstats.mld_v2queries[dir]++;
2546                         else
2547                                 pstats->mstats.mld_v1queries[dir]++;
2548                         break;
2549                 case ICMPV6_MGM_REDUCTION:
2550                         pstats->mstats.mld_leaves[dir]++;
2551                         break;
2552                 }
2553                 break;
2554 #endif /* CONFIG_IPV6 */
2555         }
2556         u64_stats_update_end(&pstats->syncp);
2557 }
2558 
2559 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
2560                         const struct sk_buff *skb, u8 type, u8 dir)
2561 {
2562         struct bridge_mcast_stats __percpu *stats;
2563 
2564         /* if multicast_disabled is true then igmp type can't be set */
2565         if (!type || !br->multicast_stats_enabled)
2566                 return;
2567 
2568         if (p)
2569                 stats = p->mcast_stats;
2570         else
2571                 stats = br->mcast_stats;
2572         if (WARN_ON(!stats))
2573                 return;
2574 
2575         br_mcast_stats_add(stats, skb, type, dir);
2576 }
2577 
2578 int br_multicast_init_stats(struct net_bridge *br)
2579 {
2580         br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2581         if (!br->mcast_stats)
2582                 return -ENOMEM;
2583 
2584         return 0;
2585 }
2586 
2587 void br_multicast_uninit_stats(struct net_bridge *br)
2588 {
2589         free_percpu(br->mcast_stats);
2590 }
2591 
2592 static void mcast_stats_add_dir(u64 *dst, u64 *src)
2593 {
2594         dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2595         dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2596 }
2597 
2598 void br_multicast_get_stats(const struct net_bridge *br,
2599                             const struct net_bridge_port *p,
2600                             struct br_mcast_stats *dest)
2601 {
2602         struct bridge_mcast_stats __percpu *stats;
2603         struct br_mcast_stats tdst;
2604         int i;
2605 
2606         memset(dest, 0, sizeof(*dest));
2607         if (p)
2608                 stats = p->mcast_stats;
2609         else
2610                 stats = br->mcast_stats;
2611         if (WARN_ON(!stats))
2612                 return;
2613 
2614         memset(&tdst, 0, sizeof(tdst));
2615         for_each_possible_cpu(i) {
2616                 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2617                 struct br_mcast_stats temp;
2618                 unsigned int start;
2619 
2620                 do {
2621                         start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2622                         memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2623                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2624 
2625                 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2626                 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2627                 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
2628                 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2629                 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2630                 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2631                 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2632                 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2633 
2634                 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2635                 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
2636                 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2637                 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2638                 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2639                 tdst.mld_parse_errors += temp.mld_parse_errors;
2640         }
2641         memcpy(dest, &tdst, sizeof(*dest));
2642 }
2643 

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