Commit | Line | Data |
---|---|---|
eb1d1641 HX |
1 | /* |
2 | * Bridge multicast support. | |
3 | * | |
4 | * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the Free | |
8 | * Software Foundation; either version 2 of the License, or (at your option) | |
9 | * any later version. | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/err.h> | |
07f8ac4a | 14 | #include <linux/export.h> |
eb1d1641 HX |
15 | #include <linux/if_ether.h> |
16 | #include <linux/igmp.h> | |
17 | #include <linux/jhash.h> | |
18 | #include <linux/kernel.h> | |
b195167f | 19 | #include <linux/log2.h> |
eb1d1641 HX |
20 | #include <linux/netdevice.h> |
21 | #include <linux/netfilter_bridge.h> | |
22 | #include <linux/random.h> | |
23 | #include <linux/rculist.h> | |
24 | #include <linux/skbuff.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/timer.h> | |
1c8ad5bf | 27 | #include <linux/inetdevice.h> |
eb1d1641 | 28 | #include <net/ip.h> |
dfd56b8b | 29 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
30 | #include <net/ipv6.h> |
31 | #include <net/mld.h> | |
d4c4f07d | 32 | #include <net/ip6_checksum.h> |
3c3769e6 | 33 | #include <net/addrconf.h> |
08b202b6 | 34 | #endif |
eb1d1641 HX |
35 | |
36 | #include "br_private.h" | |
37 | ||
cc0fdd80 | 38 | static void br_multicast_start_querier(struct net_bridge *br, |
90010b36 | 39 | struct bridge_mcast_own_query *query); |
754bc547 SA |
40 | static void br_multicast_add_router(struct net_bridge *br, |
41 | struct net_bridge_port *port); | |
2ce297fc | 42 | unsigned int br_mdb_rehash_seq; |
c83b8fab | 43 | |
8ef2a9a5 YH |
44 | static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b) |
45 | { | |
46 | if (a->proto != b->proto) | |
47 | return 0; | |
b0e9a30d VY |
48 | if (a->vid != b->vid) |
49 | return 0; | |
8ef2a9a5 YH |
50 | switch (a->proto) { |
51 | case htons(ETH_P_IP): | |
52 | return a->u.ip4 == b->u.ip4; | |
dfd56b8b | 53 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
54 | case htons(ETH_P_IPV6): |
55 | return ipv6_addr_equal(&a->u.ip6, &b->u.ip6); | |
56 | #endif | |
8ef2a9a5 YH |
57 | } |
58 | return 0; | |
59 | } | |
60 | ||
b0e9a30d VY |
61 | static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip, |
62 | __u16 vid) | |
eb1d1641 | 63 | { |
b0e9a30d | 64 | return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1); |
eb1d1641 HX |
65 | } |
66 | ||
dfd56b8b | 67 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 68 | static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb, |
b0e9a30d VY |
69 | const struct in6_addr *ip, |
70 | __u16 vid) | |
08b202b6 | 71 | { |
b0e9a30d VY |
72 | return jhash_2words(ipv6_addr_hash(ip), vid, |
73 | mdb->secret) & (mdb->max - 1); | |
08b202b6 YH |
74 | } |
75 | #endif | |
76 | ||
8ef2a9a5 YH |
77 | static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb, |
78 | struct br_ip *ip) | |
79 | { | |
80 | switch (ip->proto) { | |
81 | case htons(ETH_P_IP): | |
b0e9a30d | 82 | return __br_ip4_hash(mdb, ip->u.ip4, ip->vid); |
dfd56b8b | 83 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 84 | case htons(ETH_P_IPV6): |
b0e9a30d | 85 | return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid); |
08b202b6 | 86 | #endif |
8ef2a9a5 YH |
87 | } |
88 | return 0; | |
eb1d1641 HX |
89 | } |
90 | ||
91 | static struct net_bridge_mdb_entry *__br_mdb_ip_get( | |
8ef2a9a5 | 92 | struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash) |
eb1d1641 HX |
93 | { |
94 | struct net_bridge_mdb_entry *mp; | |
eb1d1641 | 95 | |
b67bfe0d | 96 | hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) { |
8ef2a9a5 | 97 | if (br_ip_equal(&mp->addr, dst)) |
eb1d1641 HX |
98 | return mp; |
99 | } | |
100 | ||
101 | return NULL; | |
102 | } | |
103 | ||
cfd56754 CW |
104 | struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, |
105 | struct br_ip *dst) | |
7f285fa7 HX |
106 | { |
107 | if (!mdb) | |
108 | return NULL; | |
109 | ||
110 | return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst)); | |
111 | } | |
112 | ||
8ef2a9a5 | 113 | static struct net_bridge_mdb_entry *br_mdb_ip4_get( |
b0e9a30d | 114 | struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid) |
eb1d1641 | 115 | { |
8ef2a9a5 YH |
116 | struct br_ip br_dst; |
117 | ||
118 | br_dst.u.ip4 = dst; | |
119 | br_dst.proto = htons(ETH_P_IP); | |
b0e9a30d | 120 | br_dst.vid = vid; |
0821ec55 | 121 | |
7f285fa7 | 122 | return br_mdb_ip_get(mdb, &br_dst); |
8ef2a9a5 YH |
123 | } |
124 | ||
dfd56b8b | 125 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 126 | static struct net_bridge_mdb_entry *br_mdb_ip6_get( |
b0e9a30d VY |
127 | struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst, |
128 | __u16 vid) | |
08b202b6 YH |
129 | { |
130 | struct br_ip br_dst; | |
0821ec55 | 131 | |
4e3fd7a0 | 132 | br_dst.u.ip6 = *dst; |
08b202b6 | 133 | br_dst.proto = htons(ETH_P_IPV6); |
b0e9a30d | 134 | br_dst.vid = vid; |
08b202b6 | 135 | |
7f285fa7 | 136 | return br_mdb_ip_get(mdb, &br_dst); |
08b202b6 YH |
137 | } |
138 | #endif | |
139 | ||
eb1d1641 | 140 | struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, |
fbca58a2 | 141 | struct sk_buff *skb, u16 vid) |
eb1d1641 | 142 | { |
e8051688 | 143 | struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb); |
8ef2a9a5 YH |
144 | struct br_ip ip; |
145 | ||
7f285fa7 | 146 | if (br->multicast_disabled) |
eb1d1641 HX |
147 | return NULL; |
148 | ||
8ef2a9a5 | 149 | if (BR_INPUT_SKB_CB(skb)->igmp) |
eb1d1641 HX |
150 | return NULL; |
151 | ||
8ef2a9a5 | 152 | ip.proto = skb->protocol; |
fbca58a2 | 153 | ip.vid = vid; |
8ef2a9a5 | 154 | |
eb1d1641 HX |
155 | switch (skb->protocol) { |
156 | case htons(ETH_P_IP): | |
8ef2a9a5 YH |
157 | ip.u.ip4 = ip_hdr(skb)->daddr; |
158 | break; | |
dfd56b8b | 159 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 160 | case htons(ETH_P_IPV6): |
4e3fd7a0 | 161 | ip.u.ip6 = ipv6_hdr(skb)->daddr; |
08b202b6 YH |
162 | break; |
163 | #endif | |
8ef2a9a5 YH |
164 | default: |
165 | return NULL; | |
eb1d1641 HX |
166 | } |
167 | ||
8ef2a9a5 | 168 | return br_mdb_ip_get(mdb, &ip); |
eb1d1641 HX |
169 | } |
170 | ||
171 | static void br_mdb_free(struct rcu_head *head) | |
172 | { | |
173 | struct net_bridge_mdb_htable *mdb = | |
174 | container_of(head, struct net_bridge_mdb_htable, rcu); | |
175 | struct net_bridge_mdb_htable *old = mdb->old; | |
176 | ||
177 | mdb->old = NULL; | |
178 | kfree(old->mhash); | |
179 | kfree(old); | |
180 | } | |
181 | ||
182 | static int br_mdb_copy(struct net_bridge_mdb_htable *new, | |
183 | struct net_bridge_mdb_htable *old, | |
184 | int elasticity) | |
185 | { | |
186 | struct net_bridge_mdb_entry *mp; | |
eb1d1641 HX |
187 | int maxlen; |
188 | int len; | |
189 | int i; | |
190 | ||
191 | for (i = 0; i < old->max; i++) | |
b67bfe0d | 192 | hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver]) |
eb1d1641 | 193 | hlist_add_head(&mp->hlist[new->ver], |
8ef2a9a5 | 194 | &new->mhash[br_ip_hash(new, &mp->addr)]); |
eb1d1641 HX |
195 | |
196 | if (!elasticity) | |
197 | return 0; | |
198 | ||
199 | maxlen = 0; | |
200 | for (i = 0; i < new->max; i++) { | |
201 | len = 0; | |
b67bfe0d | 202 | hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver]) |
eb1d1641 HX |
203 | len++; |
204 | if (len > maxlen) | |
205 | maxlen = len; | |
206 | } | |
207 | ||
208 | return maxlen > elasticity ? -EINVAL : 0; | |
209 | } | |
210 | ||
cfd56754 | 211 | void br_multicast_free_pg(struct rcu_head *head) |
eb1d1641 HX |
212 | { |
213 | struct net_bridge_port_group *p = | |
214 | container_of(head, struct net_bridge_port_group, rcu); | |
215 | ||
216 | kfree(p); | |
217 | } | |
218 | ||
219 | static void br_multicast_free_group(struct rcu_head *head) | |
220 | { | |
221 | struct net_bridge_mdb_entry *mp = | |
222 | container_of(head, struct net_bridge_mdb_entry, rcu); | |
223 | ||
224 | kfree(mp); | |
225 | } | |
226 | ||
227 | static void br_multicast_group_expired(unsigned long data) | |
228 | { | |
229 | struct net_bridge_mdb_entry *mp = (void *)data; | |
230 | struct net_bridge *br = mp->br; | |
231 | struct net_bridge_mdb_htable *mdb; | |
232 | ||
233 | spin_lock(&br->multicast_lock); | |
234 | if (!netif_running(br->dev) || timer_pending(&mp->timer)) | |
235 | goto out; | |
236 | ||
8a870178 | 237 | mp->mglist = false; |
eb1d1641 HX |
238 | |
239 | if (mp->ports) | |
240 | goto out; | |
241 | ||
e8051688 ED |
242 | mdb = mlock_dereference(br->mdb, br); |
243 | ||
eb1d1641 HX |
244 | hlist_del_rcu(&mp->hlist[mdb->ver]); |
245 | mdb->size--; | |
246 | ||
eb1d1641 HX |
247 | call_rcu_bh(&mp->rcu, br_multicast_free_group); |
248 | ||
249 | out: | |
250 | spin_unlock(&br->multicast_lock); | |
251 | } | |
252 | ||
253 | static void br_multicast_del_pg(struct net_bridge *br, | |
254 | struct net_bridge_port_group *pg) | |
255 | { | |
e8051688 | 256 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 HX |
257 | struct net_bridge_mdb_entry *mp; |
258 | struct net_bridge_port_group *p; | |
e8051688 ED |
259 | struct net_bridge_port_group __rcu **pp; |
260 | ||
261 | mdb = mlock_dereference(br->mdb, br); | |
eb1d1641 | 262 | |
8ef2a9a5 | 263 | mp = br_mdb_ip_get(mdb, &pg->addr); |
eb1d1641 HX |
264 | if (WARN_ON(!mp)) |
265 | return; | |
266 | ||
e8051688 ED |
267 | for (pp = &mp->ports; |
268 | (p = mlock_dereference(*pp, br)) != NULL; | |
269 | pp = &p->next) { | |
eb1d1641 HX |
270 | if (p != pg) |
271 | continue; | |
272 | ||
83f6a740 | 273 | rcu_assign_pointer(*pp, p->next); |
eb1d1641 HX |
274 | hlist_del_init(&p->mglist); |
275 | del_timer(&p->timer); | |
ef8299de NA |
276 | br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB, |
277 | p->state); | |
eb1d1641 HX |
278 | call_rcu_bh(&p->rcu, br_multicast_free_pg); |
279 | ||
454594f3 | 280 | if (!mp->ports && !mp->mglist && |
eb1d1641 HX |
281 | netif_running(br->dev)) |
282 | mod_timer(&mp->timer, jiffies); | |
283 | ||
284 | return; | |
285 | } | |
286 | ||
287 | WARN_ON(1); | |
288 | } | |
289 | ||
290 | static void br_multicast_port_group_expired(unsigned long data) | |
291 | { | |
292 | struct net_bridge_port_group *pg = (void *)data; | |
293 | struct net_bridge *br = pg->port->br; | |
294 | ||
295 | spin_lock(&br->multicast_lock); | |
296 | if (!netif_running(br->dev) || timer_pending(&pg->timer) || | |
ccb1c31a | 297 | hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT) |
eb1d1641 HX |
298 | goto out; |
299 | ||
300 | br_multicast_del_pg(br, pg); | |
301 | ||
302 | out: | |
303 | spin_unlock(&br->multicast_lock); | |
304 | } | |
305 | ||
e8051688 | 306 | static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max, |
eb1d1641 HX |
307 | int elasticity) |
308 | { | |
e8051688 | 309 | struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1); |
eb1d1641 HX |
310 | struct net_bridge_mdb_htable *mdb; |
311 | int err; | |
312 | ||
313 | mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC); | |
314 | if (!mdb) | |
315 | return -ENOMEM; | |
316 | ||
317 | mdb->max = max; | |
318 | mdb->old = old; | |
319 | ||
320 | mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC); | |
321 | if (!mdb->mhash) { | |
322 | kfree(mdb); | |
323 | return -ENOMEM; | |
324 | } | |
325 | ||
326 | mdb->size = old ? old->size : 0; | |
327 | mdb->ver = old ? old->ver ^ 1 : 0; | |
328 | ||
329 | if (!old || elasticity) | |
330 | get_random_bytes(&mdb->secret, sizeof(mdb->secret)); | |
331 | else | |
332 | mdb->secret = old->secret; | |
333 | ||
334 | if (!old) | |
335 | goto out; | |
336 | ||
337 | err = br_mdb_copy(mdb, old, elasticity); | |
338 | if (err) { | |
339 | kfree(mdb->mhash); | |
340 | kfree(mdb); | |
341 | return err; | |
342 | } | |
343 | ||
2ce297fc | 344 | br_mdb_rehash_seq++; |
eb1d1641 HX |
345 | call_rcu_bh(&mdb->rcu, br_mdb_free); |
346 | ||
347 | out: | |
348 | rcu_assign_pointer(*mdbp, mdb); | |
349 | ||
350 | return 0; | |
351 | } | |
352 | ||
8ef2a9a5 YH |
353 | static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br, |
354 | __be32 group) | |
eb1d1641 HX |
355 | { |
356 | struct sk_buff *skb; | |
357 | struct igmphdr *ih; | |
358 | struct ethhdr *eth; | |
359 | struct iphdr *iph; | |
360 | ||
361 | skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) + | |
362 | sizeof(*ih) + 4); | |
363 | if (!skb) | |
364 | goto out; | |
365 | ||
366 | skb->protocol = htons(ETH_P_IP); | |
367 | ||
368 | skb_reset_mac_header(skb); | |
369 | eth = eth_hdr(skb); | |
370 | ||
e5a727f6 | 371 | ether_addr_copy(eth->h_source, br->dev->dev_addr); |
eb1d1641 HX |
372 | eth->h_dest[0] = 1; |
373 | eth->h_dest[1] = 0; | |
374 | eth->h_dest[2] = 0x5e; | |
375 | eth->h_dest[3] = 0; | |
376 | eth->h_dest[4] = 0; | |
377 | eth->h_dest[5] = 1; | |
378 | eth->h_proto = htons(ETH_P_IP); | |
379 | skb_put(skb, sizeof(*eth)); | |
380 | ||
381 | skb_set_network_header(skb, skb->len); | |
382 | iph = ip_hdr(skb); | |
383 | ||
384 | iph->version = 4; | |
385 | iph->ihl = 6; | |
386 | iph->tos = 0xc0; | |
387 | iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4); | |
388 | iph->id = 0; | |
389 | iph->frag_off = htons(IP_DF); | |
390 | iph->ttl = 1; | |
391 | iph->protocol = IPPROTO_IGMP; | |
1c8ad5bf CW |
392 | iph->saddr = br->multicast_query_use_ifaddr ? |
393 | inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0; | |
eb1d1641 HX |
394 | iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); |
395 | ((u8 *)&iph[1])[0] = IPOPT_RA; | |
396 | ((u8 *)&iph[1])[1] = 4; | |
397 | ((u8 *)&iph[1])[2] = 0; | |
398 | ((u8 *)&iph[1])[3] = 0; | |
399 | ip_send_check(iph); | |
400 | skb_put(skb, 24); | |
401 | ||
402 | skb_set_transport_header(skb, skb->len); | |
403 | ih = igmp_hdr(skb); | |
404 | ih->type = IGMP_HOST_MEMBERSHIP_QUERY; | |
405 | ih->code = (group ? br->multicast_last_member_interval : | |
406 | br->multicast_query_response_interval) / | |
407 | (HZ / IGMP_TIMER_SCALE); | |
408 | ih->group = group; | |
409 | ih->csum = 0; | |
410 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
411 | skb_put(skb, sizeof(*ih)); | |
412 | ||
413 | __skb_pull(skb, sizeof(*eth)); | |
414 | ||
415 | out: | |
416 | return skb; | |
417 | } | |
418 | ||
dfd56b8b | 419 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 420 | static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, |
b71d1d42 | 421 | const struct in6_addr *group) |
08b202b6 YH |
422 | { |
423 | struct sk_buff *skb; | |
424 | struct ipv6hdr *ip6h; | |
425 | struct mld_msg *mldq; | |
426 | struct ethhdr *eth; | |
427 | u8 *hopopt; | |
428 | unsigned long interval; | |
429 | ||
430 | skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) + | |
431 | 8 + sizeof(*mldq)); | |
432 | if (!skb) | |
433 | goto out; | |
434 | ||
435 | skb->protocol = htons(ETH_P_IPV6); | |
436 | ||
437 | /* Ethernet header */ | |
438 | skb_reset_mac_header(skb); | |
439 | eth = eth_hdr(skb); | |
440 | ||
e5a727f6 | 441 | ether_addr_copy(eth->h_source, br->dev->dev_addr); |
08b202b6 YH |
442 | eth->h_proto = htons(ETH_P_IPV6); |
443 | skb_put(skb, sizeof(*eth)); | |
444 | ||
445 | /* IPv6 header + HbH option */ | |
446 | skb_set_network_header(skb, skb->len); | |
447 | ip6h = ipv6_hdr(skb); | |
448 | ||
449 | *(__force __be32 *)ip6h = htonl(0x60000000); | |
76d66158 | 450 | ip6h->payload_len = htons(8 + sizeof(*mldq)); |
08b202b6 YH |
451 | ip6h->nexthdr = IPPROTO_HOPOPTS; |
452 | ip6h->hop_limit = 1; | |
a7bff75b | 453 | ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1)); |
d1d81d4c UW |
454 | if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0, |
455 | &ip6h->saddr)) { | |
456 | kfree_skb(skb); | |
457 | return NULL; | |
458 | } | |
36cff5a1 | 459 | ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); |
08b202b6 YH |
460 | |
461 | hopopt = (u8 *)(ip6h + 1); | |
462 | hopopt[0] = IPPROTO_ICMPV6; /* next hdr */ | |
463 | hopopt[1] = 0; /* length of HbH */ | |
464 | hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */ | |
465 | hopopt[3] = 2; /* Length of RA Option */ | |
466 | hopopt[4] = 0; /* Type = 0x0000 (MLD) */ | |
467 | hopopt[5] = 0; | |
1de5a71c EZ |
468 | hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */ |
469 | hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */ | |
08b202b6 YH |
470 | |
471 | skb_put(skb, sizeof(*ip6h) + 8); | |
472 | ||
473 | /* ICMPv6 */ | |
474 | skb_set_transport_header(skb, skb->len); | |
475 | mldq = (struct mld_msg *) icmp6_hdr(skb); | |
476 | ||
32de868c LL |
477 | interval = ipv6_addr_any(group) ? |
478 | br->multicast_query_response_interval : | |
479 | br->multicast_last_member_interval; | |
08b202b6 YH |
480 | |
481 | mldq->mld_type = ICMPV6_MGM_QUERY; | |
482 | mldq->mld_code = 0; | |
483 | mldq->mld_cksum = 0; | |
484 | mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); | |
485 | mldq->mld_reserved = 0; | |
4e3fd7a0 | 486 | mldq->mld_mca = *group; |
08b202b6 YH |
487 | |
488 | /* checksum */ | |
489 | mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
490 | sizeof(*mldq), IPPROTO_ICMPV6, | |
491 | csum_partial(mldq, | |
492 | sizeof(*mldq), 0)); | |
493 | skb_put(skb, sizeof(*mldq)); | |
494 | ||
495 | __skb_pull(skb, sizeof(*eth)); | |
496 | ||
497 | out: | |
498 | return skb; | |
499 | } | |
500 | #endif | |
501 | ||
8ef2a9a5 YH |
502 | static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, |
503 | struct br_ip *addr) | |
504 | { | |
505 | switch (addr->proto) { | |
506 | case htons(ETH_P_IP): | |
507 | return br_ip4_multicast_alloc_query(br, addr->u.ip4); | |
dfd56b8b | 508 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
509 | case htons(ETH_P_IPV6): |
510 | return br_ip6_multicast_alloc_query(br, &addr->u.ip6); | |
511 | #endif | |
8ef2a9a5 YH |
512 | } |
513 | return NULL; | |
514 | } | |
515 | ||
eb1d1641 | 516 | static struct net_bridge_mdb_entry *br_multicast_get_group( |
8ef2a9a5 YH |
517 | struct net_bridge *br, struct net_bridge_port *port, |
518 | struct br_ip *group, int hash) | |
eb1d1641 | 519 | { |
e8051688 | 520 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 | 521 | struct net_bridge_mdb_entry *mp; |
95c96174 ED |
522 | unsigned int count = 0; |
523 | unsigned int max; | |
eb1d1641 HX |
524 | int elasticity; |
525 | int err; | |
526 | ||
e8051688 | 527 | mdb = rcu_dereference_protected(br->mdb, 1); |
b67bfe0d | 528 | hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) { |
eb1d1641 | 529 | count++; |
8ef2a9a5 | 530 | if (unlikely(br_ip_equal(group, &mp->addr))) |
eb1d1641 | 531 | return mp; |
eb1d1641 HX |
532 | } |
533 | ||
534 | elasticity = 0; | |
535 | max = mdb->max; | |
536 | ||
537 | if (unlikely(count > br->hash_elasticity && count)) { | |
538 | if (net_ratelimit()) | |
28a16c97 | 539 | br_info(br, "Multicast hash table " |
540 | "chain limit reached: %s\n", | |
541 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
542 | |
543 | elasticity = br->hash_elasticity; | |
544 | } | |
545 | ||
546 | if (mdb->size >= max) { | |
547 | max *= 2; | |
036be6db TG |
548 | if (unlikely(max > br->hash_max)) { |
549 | br_warn(br, "Multicast hash table maximum of %d " | |
550 | "reached, disabling snooping: %s\n", | |
551 | br->hash_max, | |
552 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
553 | err = -E2BIG; |
554 | disable: | |
555 | br->multicast_disabled = 1; | |
556 | goto err; | |
557 | } | |
558 | } | |
559 | ||
560 | if (max > mdb->max || elasticity) { | |
561 | if (mdb->old) { | |
562 | if (net_ratelimit()) | |
28a16c97 | 563 | br_info(br, "Multicast hash table " |
564 | "on fire: %s\n", | |
565 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
566 | err = -EEXIST; |
567 | goto err; | |
568 | } | |
569 | ||
570 | err = br_mdb_rehash(&br->mdb, max, elasticity); | |
571 | if (err) { | |
28a16c97 | 572 | br_warn(br, "Cannot rehash multicast " |
573 | "hash table, disabling snooping: %s, %d, %d\n", | |
574 | port ? port->dev->name : br->dev->name, | |
575 | mdb->size, err); | |
eb1d1641 HX |
576 | goto disable; |
577 | } | |
578 | ||
579 | err = -EAGAIN; | |
580 | goto err; | |
581 | } | |
582 | ||
583 | return NULL; | |
584 | ||
585 | err: | |
586 | mp = ERR_PTR(err); | |
587 | return mp; | |
588 | } | |
589 | ||
cfd56754 CW |
590 | struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br, |
591 | struct net_bridge_port *port, struct br_ip *group) | |
eb1d1641 | 592 | { |
e8051688 | 593 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 HX |
594 | struct net_bridge_mdb_entry *mp; |
595 | int hash; | |
4c0833bc | 596 | int err; |
eb1d1641 | 597 | |
e8051688 | 598 | mdb = rcu_dereference_protected(br->mdb, 1); |
eb1d1641 | 599 | if (!mdb) { |
4c0833bc TK |
600 | err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0); |
601 | if (err) | |
602 | return ERR_PTR(err); | |
eb1d1641 HX |
603 | goto rehash; |
604 | } | |
605 | ||
606 | hash = br_ip_hash(mdb, group); | |
607 | mp = br_multicast_get_group(br, port, group, hash); | |
608 | switch (PTR_ERR(mp)) { | |
609 | case 0: | |
610 | break; | |
611 | ||
612 | case -EAGAIN: | |
613 | rehash: | |
e8051688 | 614 | mdb = rcu_dereference_protected(br->mdb, 1); |
eb1d1641 HX |
615 | hash = br_ip_hash(mdb, group); |
616 | break; | |
617 | ||
618 | default: | |
619 | goto out; | |
620 | } | |
621 | ||
622 | mp = kzalloc(sizeof(*mp), GFP_ATOMIC); | |
623 | if (unlikely(!mp)) | |
4c0833bc | 624 | return ERR_PTR(-ENOMEM); |
eb1d1641 HX |
625 | |
626 | mp->br = br; | |
8ef2a9a5 | 627 | mp->addr = *group; |
1faabf2a ED |
628 | setup_timer(&mp->timer, br_multicast_group_expired, |
629 | (unsigned long)mp); | |
630 | ||
eb1d1641 HX |
631 | hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]); |
632 | mdb->size++; | |
633 | ||
634 | out: | |
635 | return mp; | |
636 | } | |
637 | ||
cfd56754 CW |
638 | struct net_bridge_port_group *br_multicast_new_port_group( |
639 | struct net_bridge_port *port, | |
640 | struct br_ip *group, | |
ccb1c31a AW |
641 | struct net_bridge_port_group __rcu *next, |
642 | unsigned char state) | |
cfd56754 CW |
643 | { |
644 | struct net_bridge_port_group *p; | |
645 | ||
646 | p = kzalloc(sizeof(*p), GFP_ATOMIC); | |
647 | if (unlikely(!p)) | |
648 | return NULL; | |
649 | ||
650 | p->addr = *group; | |
651 | p->port = port; | |
ccb1c31a | 652 | p->state = state; |
eca2a43b | 653 | rcu_assign_pointer(p->next, next); |
cfd56754 CW |
654 | hlist_add_head(&p->mglist, &port->mglist); |
655 | setup_timer(&p->timer, br_multicast_port_group_expired, | |
656 | (unsigned long)p); | |
657 | return p; | |
658 | } | |
659 | ||
eb1d1641 | 660 | static int br_multicast_add_group(struct net_bridge *br, |
8ef2a9a5 YH |
661 | struct net_bridge_port *port, |
662 | struct br_ip *group) | |
eb1d1641 HX |
663 | { |
664 | struct net_bridge_mdb_entry *mp; | |
665 | struct net_bridge_port_group *p; | |
e8051688 | 666 | struct net_bridge_port_group __rcu **pp; |
454594f3 | 667 | unsigned long now = jiffies; |
eb1d1641 HX |
668 | int err; |
669 | ||
eb1d1641 HX |
670 | spin_lock(&br->multicast_lock); |
671 | if (!netif_running(br->dev) || | |
672 | (port && port->state == BR_STATE_DISABLED)) | |
673 | goto out; | |
674 | ||
675 | mp = br_multicast_new_group(br, port, group); | |
676 | err = PTR_ERR(mp); | |
4c0833bc | 677 | if (IS_ERR(mp)) |
eb1d1641 HX |
678 | goto err; |
679 | ||
680 | if (!port) { | |
8a870178 | 681 | mp->mglist = true; |
454594f3 | 682 | mod_timer(&mp->timer, now + br->multicast_membership_interval); |
eb1d1641 HX |
683 | goto out; |
684 | } | |
685 | ||
e8051688 ED |
686 | for (pp = &mp->ports; |
687 | (p = mlock_dereference(*pp, br)) != NULL; | |
688 | pp = &p->next) { | |
eb1d1641 | 689 | if (p->port == port) |
454594f3 | 690 | goto found; |
eb1d1641 HX |
691 | if ((unsigned long)p->port < (unsigned long)port) |
692 | break; | |
693 | } | |
694 | ||
ccb1c31a | 695 | p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY); |
eb1d1641 HX |
696 | if (unlikely(!p)) |
697 | goto err; | |
eb1d1641 | 698 | rcu_assign_pointer(*pp, p); |
09cf0211 | 699 | br_mdb_notify(br->dev, port, group, RTM_NEWMDB, MDB_TEMPORARY); |
eb1d1641 | 700 | |
454594f3 LL |
701 | found: |
702 | mod_timer(&p->timer, now + br->multicast_membership_interval); | |
eb1d1641 HX |
703 | out: |
704 | err = 0; | |
705 | ||
706 | err: | |
707 | spin_unlock(&br->multicast_lock); | |
708 | return err; | |
709 | } | |
710 | ||
8ef2a9a5 YH |
711 | static int br_ip4_multicast_add_group(struct net_bridge *br, |
712 | struct net_bridge_port *port, | |
b0e9a30d VY |
713 | __be32 group, |
714 | __u16 vid) | |
8ef2a9a5 YH |
715 | { |
716 | struct br_ip br_group; | |
717 | ||
718 | if (ipv4_is_local_multicast(group)) | |
719 | return 0; | |
720 | ||
721 | br_group.u.ip4 = group; | |
722 | br_group.proto = htons(ETH_P_IP); | |
b0e9a30d | 723 | br_group.vid = vid; |
8ef2a9a5 YH |
724 | |
725 | return br_multicast_add_group(br, port, &br_group); | |
726 | } | |
727 | ||
dfd56b8b | 728 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
729 | static int br_ip6_multicast_add_group(struct net_bridge *br, |
730 | struct net_bridge_port *port, | |
b0e9a30d VY |
731 | const struct in6_addr *group, |
732 | __u16 vid) | |
08b202b6 YH |
733 | { |
734 | struct br_ip br_group; | |
735 | ||
3c3769e6 | 736 | if (ipv6_addr_is_ll_all_nodes(group)) |
08b202b6 YH |
737 | return 0; |
738 | ||
4e3fd7a0 | 739 | br_group.u.ip6 = *group; |
9cc6e0c4 | 740 | br_group.proto = htons(ETH_P_IPV6); |
b0e9a30d | 741 | br_group.vid = vid; |
08b202b6 YH |
742 | |
743 | return br_multicast_add_group(br, port, &br_group); | |
744 | } | |
745 | #endif | |
746 | ||
eb1d1641 HX |
747 | static void br_multicast_router_expired(unsigned long data) |
748 | { | |
749 | struct net_bridge_port *port = (void *)data; | |
750 | struct net_bridge *br = port->br; | |
751 | ||
752 | spin_lock(&br->multicast_lock); | |
753 | if (port->multicast_router != 1 || | |
754 | timer_pending(&port->multicast_router_timer) || | |
755 | hlist_unhashed(&port->rlist)) | |
756 | goto out; | |
757 | ||
758 | hlist_del_init_rcu(&port->rlist); | |
759 | ||
760 | out: | |
761 | spin_unlock(&br->multicast_lock); | |
762 | } | |
763 | ||
764 | static void br_multicast_local_router_expired(unsigned long data) | |
765 | { | |
766 | } | |
767 | ||
cc0fdd80 | 768 | static void br_multicast_querier_expired(struct net_bridge *br, |
90010b36 | 769 | struct bridge_mcast_own_query *query) |
c83b8fab | 770 | { |
c83b8fab HX |
771 | spin_lock(&br->multicast_lock); |
772 | if (!netif_running(br->dev) || br->multicast_disabled) | |
773 | goto out; | |
774 | ||
cc0fdd80 | 775 | br_multicast_start_querier(br, query); |
c83b8fab HX |
776 | |
777 | out: | |
778 | spin_unlock(&br->multicast_lock); | |
779 | } | |
780 | ||
cc0fdd80 LL |
781 | static void br_ip4_multicast_querier_expired(unsigned long data) |
782 | { | |
783 | struct net_bridge *br = (void *)data; | |
784 | ||
90010b36 | 785 | br_multicast_querier_expired(br, &br->ip4_own_query); |
cc0fdd80 LL |
786 | } |
787 | ||
788 | #if IS_ENABLED(CONFIG_IPV6) | |
789 | static void br_ip6_multicast_querier_expired(unsigned long data) | |
790 | { | |
791 | struct net_bridge *br = (void *)data; | |
792 | ||
90010b36 | 793 | br_multicast_querier_expired(br, &br->ip6_own_query); |
cc0fdd80 LL |
794 | } |
795 | #endif | |
796 | ||
dc4eb53a LL |
797 | static void br_multicast_select_own_querier(struct net_bridge *br, |
798 | struct br_ip *ip, | |
799 | struct sk_buff *skb) | |
800 | { | |
801 | if (ip->proto == htons(ETH_P_IP)) | |
802 | br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr; | |
803 | #if IS_ENABLED(CONFIG_IPV6) | |
804 | else | |
805 | br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr; | |
806 | #endif | |
807 | } | |
808 | ||
8ef2a9a5 YH |
809 | static void __br_multicast_send_query(struct net_bridge *br, |
810 | struct net_bridge_port *port, | |
811 | struct br_ip *ip) | |
eb1d1641 | 812 | { |
eb1d1641 HX |
813 | struct sk_buff *skb; |
814 | ||
8ef2a9a5 | 815 | skb = br_multicast_alloc_query(br, ip); |
eb1d1641 | 816 | if (!skb) |
8ef2a9a5 | 817 | return; |
eb1d1641 HX |
818 | |
819 | if (port) { | |
eb1d1641 | 820 | skb->dev = port->dev; |
7026b1dd DM |
821 | NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, NULL, skb, |
822 | NULL, skb->dev, | |
f0b4eece | 823 | br_dev_queue_push_xmit); |
dc4eb53a LL |
824 | } else { |
825 | br_multicast_select_own_querier(br, ip, skb); | |
eb1d1641 | 826 | netif_rx(skb); |
dc4eb53a | 827 | } |
8ef2a9a5 YH |
828 | } |
829 | ||
830 | static void br_multicast_send_query(struct net_bridge *br, | |
cc0fdd80 | 831 | struct net_bridge_port *port, |
90010b36 | 832 | struct bridge_mcast_own_query *own_query) |
8ef2a9a5 YH |
833 | { |
834 | unsigned long time; | |
835 | struct br_ip br_group; | |
90010b36 | 836 | struct bridge_mcast_other_query *other_query = NULL; |
8ef2a9a5 YH |
837 | |
838 | if (!netif_running(br->dev) || br->multicast_disabled || | |
cc0fdd80 | 839 | !br->multicast_querier) |
8ef2a9a5 YH |
840 | return; |
841 | ||
08b202b6 YH |
842 | memset(&br_group.u, 0, sizeof(br_group.u)); |
843 | ||
90010b36 LL |
844 | if (port ? (own_query == &port->ip4_own_query) : |
845 | (own_query == &br->ip4_own_query)) { | |
846 | other_query = &br->ip4_other_query; | |
cc0fdd80 | 847 | br_group.proto = htons(ETH_P_IP); |
dfd56b8b | 848 | #if IS_ENABLED(CONFIG_IPV6) |
cc0fdd80 | 849 | } else { |
90010b36 | 850 | other_query = &br->ip6_other_query; |
cc0fdd80 | 851 | br_group.proto = htons(ETH_P_IPV6); |
08b202b6 | 852 | #endif |
cc0fdd80 LL |
853 | } |
854 | ||
90010b36 | 855 | if (!other_query || timer_pending(&other_query->timer)) |
cc0fdd80 LL |
856 | return; |
857 | ||
858 | __br_multicast_send_query(br, port, &br_group); | |
eb1d1641 | 859 | |
eb1d1641 | 860 | time = jiffies; |
90010b36 | 861 | time += own_query->startup_sent < br->multicast_startup_query_count ? |
eb1d1641 HX |
862 | br->multicast_startup_query_interval : |
863 | br->multicast_query_interval; | |
90010b36 | 864 | mod_timer(&own_query->timer, time); |
eb1d1641 HX |
865 | } |
866 | ||
90010b36 LL |
867 | static void |
868 | br_multicast_port_query_expired(struct net_bridge_port *port, | |
869 | struct bridge_mcast_own_query *query) | |
eb1d1641 | 870 | { |
eb1d1641 HX |
871 | struct net_bridge *br = port->br; |
872 | ||
873 | spin_lock(&br->multicast_lock); | |
02a780c0 DC |
874 | if (port->state == BR_STATE_DISABLED || |
875 | port->state == BR_STATE_BLOCKING) | |
eb1d1641 HX |
876 | goto out; |
877 | ||
cc0fdd80 LL |
878 | if (query->startup_sent < br->multicast_startup_query_count) |
879 | query->startup_sent++; | |
eb1d1641 | 880 | |
cc0fdd80 | 881 | br_multicast_send_query(port->br, port, query); |
eb1d1641 HX |
882 | |
883 | out: | |
884 | spin_unlock(&br->multicast_lock); | |
885 | } | |
886 | ||
cc0fdd80 LL |
887 | static void br_ip4_multicast_port_query_expired(unsigned long data) |
888 | { | |
889 | struct net_bridge_port *port = (void *)data; | |
890 | ||
90010b36 | 891 | br_multicast_port_query_expired(port, &port->ip4_own_query); |
cc0fdd80 LL |
892 | } |
893 | ||
894 | #if IS_ENABLED(CONFIG_IPV6) | |
895 | static void br_ip6_multicast_port_query_expired(unsigned long data) | |
896 | { | |
897 | struct net_bridge_port *port = (void *)data; | |
898 | ||
90010b36 | 899 | br_multicast_port_query_expired(port, &port->ip6_own_query); |
cc0fdd80 LL |
900 | } |
901 | #endif | |
902 | ||
eb1d1641 HX |
903 | void br_multicast_add_port(struct net_bridge_port *port) |
904 | { | |
905 | port->multicast_router = 1; | |
906 | ||
907 | setup_timer(&port->multicast_router_timer, br_multicast_router_expired, | |
908 | (unsigned long)port); | |
90010b36 LL |
909 | setup_timer(&port->ip4_own_query.timer, |
910 | br_ip4_multicast_port_query_expired, (unsigned long)port); | |
cc0fdd80 | 911 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 LL |
912 | setup_timer(&port->ip6_own_query.timer, |
913 | br_ip6_multicast_port_query_expired, (unsigned long)port); | |
cc0fdd80 | 914 | #endif |
eb1d1641 HX |
915 | } |
916 | ||
917 | void br_multicast_del_port(struct net_bridge_port *port) | |
918 | { | |
919 | del_timer_sync(&port->multicast_router_timer); | |
920 | } | |
921 | ||
90010b36 | 922 | static void br_multicast_enable(struct bridge_mcast_own_query *query) |
561f1103 | 923 | { |
cc0fdd80 | 924 | query->startup_sent = 0; |
561f1103 | 925 | |
cc0fdd80 LL |
926 | if (try_to_del_timer_sync(&query->timer) >= 0 || |
927 | del_timer(&query->timer)) | |
928 | mod_timer(&query->timer, jiffies); | |
561f1103 HX |
929 | } |
930 | ||
eb1d1641 HX |
931 | void br_multicast_enable_port(struct net_bridge_port *port) |
932 | { | |
933 | struct net_bridge *br = port->br; | |
934 | ||
935 | spin_lock(&br->multicast_lock); | |
936 | if (br->multicast_disabled || !netif_running(br->dev)) | |
937 | goto out; | |
938 | ||
90010b36 | 939 | br_multicast_enable(&port->ip4_own_query); |
cc0fdd80 | 940 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 | 941 | br_multicast_enable(&port->ip6_own_query); |
cc0fdd80 | 942 | #endif |
754bc547 SA |
943 | if (port->multicast_router == 2 && hlist_unhashed(&port->rlist)) |
944 | br_multicast_add_router(br, port); | |
eb1d1641 HX |
945 | |
946 | out: | |
947 | spin_unlock(&br->multicast_lock); | |
948 | } | |
949 | ||
950 | void br_multicast_disable_port(struct net_bridge_port *port) | |
951 | { | |
952 | struct net_bridge *br = port->br; | |
953 | struct net_bridge_port_group *pg; | |
b67bfe0d | 954 | struct hlist_node *n; |
eb1d1641 HX |
955 | |
956 | spin_lock(&br->multicast_lock); | |
b67bfe0d | 957 | hlist_for_each_entry_safe(pg, n, &port->mglist, mglist) |
eb1d1641 HX |
958 | br_multicast_del_pg(br, pg); |
959 | ||
960 | if (!hlist_unhashed(&port->rlist)) | |
961 | hlist_del_init_rcu(&port->rlist); | |
962 | del_timer(&port->multicast_router_timer); | |
90010b36 | 963 | del_timer(&port->ip4_own_query.timer); |
cc0fdd80 | 964 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 | 965 | del_timer(&port->ip6_own_query.timer); |
cc0fdd80 | 966 | #endif |
eb1d1641 HX |
967 | spin_unlock(&br->multicast_lock); |
968 | } | |
969 | ||
8ef2a9a5 YH |
970 | static int br_ip4_multicast_igmp3_report(struct net_bridge *br, |
971 | struct net_bridge_port *port, | |
06499098 VY |
972 | struct sk_buff *skb, |
973 | u16 vid) | |
eb1d1641 HX |
974 | { |
975 | struct igmpv3_report *ih; | |
976 | struct igmpv3_grec *grec; | |
977 | int i; | |
978 | int len; | |
979 | int num; | |
980 | int type; | |
981 | int err = 0; | |
982 | __be32 group; | |
983 | ||
eb1d1641 HX |
984 | ih = igmpv3_report_hdr(skb); |
985 | num = ntohs(ih->ngrec); | |
986 | len = sizeof(*ih); | |
987 | ||
988 | for (i = 0; i < num; i++) { | |
989 | len += sizeof(*grec); | |
990 | if (!pskb_may_pull(skb, len)) | |
991 | return -EINVAL; | |
992 | ||
fd218cf9 | 993 | grec = (void *)(skb->data + len - sizeof(*grec)); |
eb1d1641 HX |
994 | group = grec->grec_mca; |
995 | type = grec->grec_type; | |
996 | ||
8eabf95c | 997 | len += ntohs(grec->grec_nsrcs) * 4; |
eb1d1641 HX |
998 | if (!pskb_may_pull(skb, len)) |
999 | return -EINVAL; | |
1000 | ||
1001 | /* We treat this as an IGMPv2 report for now. */ | |
1002 | switch (type) { | |
1003 | case IGMPV3_MODE_IS_INCLUDE: | |
1004 | case IGMPV3_MODE_IS_EXCLUDE: | |
1005 | case IGMPV3_CHANGE_TO_INCLUDE: | |
1006 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
1007 | case IGMPV3_ALLOW_NEW_SOURCES: | |
1008 | case IGMPV3_BLOCK_OLD_SOURCES: | |
1009 | break; | |
1010 | ||
1011 | default: | |
1012 | continue; | |
1013 | } | |
1014 | ||
b0e9a30d | 1015 | err = br_ip4_multicast_add_group(br, port, group, vid); |
eb1d1641 HX |
1016 | if (err) |
1017 | break; | |
1018 | } | |
1019 | ||
1020 | return err; | |
1021 | } | |
1022 | ||
dfd56b8b | 1023 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1024 | static int br_ip6_multicast_mld2_report(struct net_bridge *br, |
1025 | struct net_bridge_port *port, | |
06499098 VY |
1026 | struct sk_buff *skb, |
1027 | u16 vid) | |
08b202b6 YH |
1028 | { |
1029 | struct icmp6hdr *icmp6h; | |
1030 | struct mld2_grec *grec; | |
1031 | int i; | |
1032 | int len; | |
1033 | int num; | |
1034 | int err = 0; | |
1035 | ||
1036 | if (!pskb_may_pull(skb, sizeof(*icmp6h))) | |
1037 | return -EINVAL; | |
1038 | ||
1039 | icmp6h = icmp6_hdr(skb); | |
1040 | num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); | |
1041 | len = sizeof(*icmp6h); | |
1042 | ||
1043 | for (i = 0; i < num; i++) { | |
1044 | __be16 *nsrcs, _nsrcs; | |
1045 | ||
1046 | nsrcs = skb_header_pointer(skb, | |
1047 | len + offsetof(struct mld2_grec, | |
649e984d | 1048 | grec_nsrcs), |
08b202b6 YH |
1049 | sizeof(_nsrcs), &_nsrcs); |
1050 | if (!nsrcs) | |
1051 | return -EINVAL; | |
1052 | ||
1053 | if (!pskb_may_pull(skb, | |
1054 | len + sizeof(*grec) + | |
d41db9f3 | 1055 | sizeof(struct in6_addr) * ntohs(*nsrcs))) |
08b202b6 YH |
1056 | return -EINVAL; |
1057 | ||
1058 | grec = (struct mld2_grec *)(skb->data + len); | |
d41db9f3 LL |
1059 | len += sizeof(*grec) + |
1060 | sizeof(struct in6_addr) * ntohs(*nsrcs); | |
08b202b6 YH |
1061 | |
1062 | /* We treat these as MLDv1 reports for now. */ | |
1063 | switch (grec->grec_type) { | |
1064 | case MLD2_MODE_IS_INCLUDE: | |
1065 | case MLD2_MODE_IS_EXCLUDE: | |
1066 | case MLD2_CHANGE_TO_INCLUDE: | |
1067 | case MLD2_CHANGE_TO_EXCLUDE: | |
1068 | case MLD2_ALLOW_NEW_SOURCES: | |
1069 | case MLD2_BLOCK_OLD_SOURCES: | |
1070 | break; | |
1071 | ||
1072 | default: | |
1073 | continue; | |
1074 | } | |
1075 | ||
b0e9a30d VY |
1076 | err = br_ip6_multicast_add_group(br, port, &grec->grec_mca, |
1077 | vid); | |
47cc84ce | 1078 | if (err) |
08b202b6 YH |
1079 | break; |
1080 | } | |
1081 | ||
1082 | return err; | |
1083 | } | |
1084 | #endif | |
1085 | ||
dc4eb53a | 1086 | static bool br_ip4_multicast_select_querier(struct net_bridge *br, |
2cd41431 | 1087 | struct net_bridge_port *port, |
dc4eb53a LL |
1088 | __be32 saddr) |
1089 | { | |
1090 | if (!timer_pending(&br->ip4_own_query.timer) && | |
1091 | !timer_pending(&br->ip4_other_query.timer)) | |
1092 | goto update; | |
1093 | ||
1094 | if (!br->ip4_querier.addr.u.ip4) | |
1095 | goto update; | |
1096 | ||
1097 | if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4)) | |
1098 | goto update; | |
1099 | ||
1100 | return false; | |
1101 | ||
1102 | update: | |
1103 | br->ip4_querier.addr.u.ip4 = saddr; | |
1104 | ||
2cd41431 LL |
1105 | /* update protected by general multicast_lock by caller */ |
1106 | rcu_assign_pointer(br->ip4_querier.port, port); | |
1107 | ||
dc4eb53a LL |
1108 | return true; |
1109 | } | |
1110 | ||
1111 | #if IS_ENABLED(CONFIG_IPV6) | |
1112 | static bool br_ip6_multicast_select_querier(struct net_bridge *br, | |
2cd41431 | 1113 | struct net_bridge_port *port, |
dc4eb53a LL |
1114 | struct in6_addr *saddr) |
1115 | { | |
1116 | if (!timer_pending(&br->ip6_own_query.timer) && | |
1117 | !timer_pending(&br->ip6_other_query.timer)) | |
1118 | goto update; | |
1119 | ||
1120 | if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0) | |
1121 | goto update; | |
1122 | ||
1123 | return false; | |
1124 | ||
1125 | update: | |
1126 | br->ip6_querier.addr.u.ip6 = *saddr; | |
1127 | ||
2cd41431 LL |
1128 | /* update protected by general multicast_lock by caller */ |
1129 | rcu_assign_pointer(br->ip6_querier.port, port); | |
1130 | ||
dc4eb53a LL |
1131 | return true; |
1132 | } | |
1133 | #endif | |
1134 | ||
1135 | static bool br_multicast_select_querier(struct net_bridge *br, | |
2cd41431 | 1136 | struct net_bridge_port *port, |
dc4eb53a LL |
1137 | struct br_ip *saddr) |
1138 | { | |
1139 | switch (saddr->proto) { | |
1140 | case htons(ETH_P_IP): | |
2cd41431 | 1141 | return br_ip4_multicast_select_querier(br, port, saddr->u.ip4); |
dc4eb53a LL |
1142 | #if IS_ENABLED(CONFIG_IPV6) |
1143 | case htons(ETH_P_IPV6): | |
2cd41431 | 1144 | return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6); |
dc4eb53a LL |
1145 | #endif |
1146 | } | |
1147 | ||
1148 | return false; | |
1149 | } | |
1150 | ||
cc0fdd80 | 1151 | static void |
90010b36 LL |
1152 | br_multicast_update_query_timer(struct net_bridge *br, |
1153 | struct bridge_mcast_other_query *query, | |
1154 | unsigned long max_delay) | |
b00589af | 1155 | { |
90010b36 LL |
1156 | if (!timer_pending(&query->timer)) |
1157 | query->delay_time = jiffies + max_delay; | |
b00589af | 1158 | |
90010b36 | 1159 | mod_timer(&query->timer, jiffies + br->multicast_querier_interval); |
b00589af LL |
1160 | } |
1161 | ||
7e80c124 | 1162 | /* |
7c77602f | 1163 | * Add port to router_list |
7e80c124 | 1164 | * list is maintained ordered by pointer value |
1165 | * and locked by br->multicast_lock and RCU | |
1166 | */ | |
0909e117 HX |
1167 | static void br_multicast_add_router(struct net_bridge *br, |
1168 | struct net_bridge_port *port) | |
1169 | { | |
dcdca2c4 | 1170 | struct net_bridge_port *p; |
b67bfe0d | 1171 | struct hlist_node *slot = NULL; |
dcdca2c4 | 1172 | |
1a040eac NA |
1173 | if (!hlist_unhashed(&port->rlist)) |
1174 | return; | |
1175 | ||
b67bfe0d | 1176 | hlist_for_each_entry(p, &br->router_list, rlist) { |
7e80c124 | 1177 | if ((unsigned long) port >= (unsigned long) p) |
1178 | break; | |
b67bfe0d | 1179 | slot = &p->rlist; |
dcdca2c4 | 1180 | } |
1181 | ||
7e80c124 | 1182 | if (slot) |
1d023284 | 1183 | hlist_add_behind_rcu(&port->rlist, slot); |
dcdca2c4 | 1184 | else |
1185 | hlist_add_head_rcu(&port->rlist, &br->router_list); | |
0909e117 HX |
1186 | } |
1187 | ||
eb1d1641 HX |
1188 | static void br_multicast_mark_router(struct net_bridge *br, |
1189 | struct net_bridge_port *port) | |
1190 | { | |
1191 | unsigned long now = jiffies; | |
eb1d1641 HX |
1192 | |
1193 | if (!port) { | |
1194 | if (br->multicast_router == 1) | |
1195 | mod_timer(&br->multicast_router_timer, | |
1196 | now + br->multicast_querier_interval); | |
1197 | return; | |
1198 | } | |
1199 | ||
1200 | if (port->multicast_router != 1) | |
1201 | return; | |
1202 | ||
0909e117 | 1203 | br_multicast_add_router(br, port); |
eb1d1641 | 1204 | |
eb1d1641 HX |
1205 | mod_timer(&port->multicast_router_timer, |
1206 | now + br->multicast_querier_interval); | |
1207 | } | |
1208 | ||
1209 | static void br_multicast_query_received(struct net_bridge *br, | |
1210 | struct net_bridge_port *port, | |
90010b36 | 1211 | struct bridge_mcast_other_query *query, |
dc4eb53a | 1212 | struct br_ip *saddr, |
b00589af | 1213 | unsigned long max_delay) |
eb1d1641 | 1214 | { |
2cd41431 | 1215 | if (!br_multicast_select_querier(br, port, saddr)) |
eb1d1641 HX |
1216 | return; |
1217 | ||
dc4eb53a | 1218 | br_multicast_update_query_timer(br, query, max_delay); |
eb1d1641 HX |
1219 | br_multicast_mark_router(br, port); |
1220 | } | |
1221 | ||
8ef2a9a5 YH |
1222 | static int br_ip4_multicast_query(struct net_bridge *br, |
1223 | struct net_bridge_port *port, | |
06499098 VY |
1224 | struct sk_buff *skb, |
1225 | u16 vid) | |
eb1d1641 | 1226 | { |
b71d1d42 | 1227 | const struct iphdr *iph = ip_hdr(skb); |
eb1d1641 HX |
1228 | struct igmphdr *ih = igmp_hdr(skb); |
1229 | struct net_bridge_mdb_entry *mp; | |
1230 | struct igmpv3_query *ih3; | |
1231 | struct net_bridge_port_group *p; | |
e8051688 | 1232 | struct net_bridge_port_group __rcu **pp; |
dc4eb53a | 1233 | struct br_ip saddr; |
eb1d1641 HX |
1234 | unsigned long max_delay; |
1235 | unsigned long now = jiffies; | |
1236 | __be32 group; | |
bec68ff1 | 1237 | int err = 0; |
eb1d1641 HX |
1238 | |
1239 | spin_lock(&br->multicast_lock); | |
1240 | if (!netif_running(br->dev) || | |
1241 | (port && port->state == BR_STATE_DISABLED)) | |
1242 | goto out; | |
1243 | ||
eb1d1641 HX |
1244 | group = ih->group; |
1245 | ||
1246 | if (skb->len == sizeof(*ih)) { | |
1247 | max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); | |
1248 | ||
1249 | if (!max_delay) { | |
1250 | max_delay = 10 * HZ; | |
1251 | group = 0; | |
1252 | } | |
9afd85c9 | 1253 | } else if (skb->len >= sizeof(*ih3)) { |
eb1d1641 HX |
1254 | ih3 = igmpv3_query_hdr(skb); |
1255 | if (ih3->nsrcs) | |
bec68ff1 | 1256 | goto out; |
eb1d1641 | 1257 | |
0ba8c9ec YH |
1258 | max_delay = ih3->code ? |
1259 | IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; | |
9afd85c9 | 1260 | } else { |
9ed973cc LL |
1261 | goto out; |
1262 | } | |
1263 | ||
dc4eb53a LL |
1264 | if (!group) { |
1265 | saddr.proto = htons(ETH_P_IP); | |
1266 | saddr.u.ip4 = iph->saddr; | |
b00589af | 1267 | |
dc4eb53a LL |
1268 | br_multicast_query_received(br, port, &br->ip4_other_query, |
1269 | &saddr, max_delay); | |
eb1d1641 | 1270 | goto out; |
dc4eb53a | 1271 | } |
eb1d1641 | 1272 | |
b0e9a30d | 1273 | mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid); |
eb1d1641 HX |
1274 | if (!mp) |
1275 | goto out; | |
1276 | ||
1277 | max_delay *= br->multicast_last_member_count; | |
1278 | ||
8a870178 | 1279 | if (mp->mglist && |
eb1d1641 HX |
1280 | (timer_pending(&mp->timer) ? |
1281 | time_after(mp->timer.expires, now + max_delay) : | |
1282 | try_to_del_timer_sync(&mp->timer) >= 0)) | |
1283 | mod_timer(&mp->timer, now + max_delay); | |
1284 | ||
e8051688 ED |
1285 | for (pp = &mp->ports; |
1286 | (p = mlock_dereference(*pp, br)) != NULL; | |
1287 | pp = &p->next) { | |
eb1d1641 HX |
1288 | if (timer_pending(&p->timer) ? |
1289 | time_after(p->timer.expires, now + max_delay) : | |
1290 | try_to_del_timer_sync(&p->timer) >= 0) | |
24f9cdcb | 1291 | mod_timer(&p->timer, now + max_delay); |
eb1d1641 HX |
1292 | } |
1293 | ||
1294 | out: | |
1295 | spin_unlock(&br->multicast_lock); | |
bec68ff1 | 1296 | return err; |
eb1d1641 HX |
1297 | } |
1298 | ||
dfd56b8b | 1299 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1300 | static int br_ip6_multicast_query(struct net_bridge *br, |
1301 | struct net_bridge_port *port, | |
06499098 VY |
1302 | struct sk_buff *skb, |
1303 | u16 vid) | |
08b202b6 | 1304 | { |
b71d1d42 | 1305 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
eca2a43b | 1306 | struct mld_msg *mld; |
08b202b6 YH |
1307 | struct net_bridge_mdb_entry *mp; |
1308 | struct mld2_query *mld2q; | |
e8051688 ED |
1309 | struct net_bridge_port_group *p; |
1310 | struct net_bridge_port_group __rcu **pp; | |
dc4eb53a | 1311 | struct br_ip saddr; |
08b202b6 YH |
1312 | unsigned long max_delay; |
1313 | unsigned long now = jiffies; | |
b71d1d42 | 1314 | const struct in6_addr *group = NULL; |
9ed973cc | 1315 | bool is_general_query; |
08b202b6 YH |
1316 | int err = 0; |
1317 | ||
1318 | spin_lock(&br->multicast_lock); | |
1319 | if (!netif_running(br->dev) || | |
1320 | (port && port->state == BR_STATE_DISABLED)) | |
1321 | goto out; | |
1322 | ||
08b202b6 YH |
1323 | if (skb->len == sizeof(*mld)) { |
1324 | if (!pskb_may_pull(skb, sizeof(*mld))) { | |
1325 | err = -EINVAL; | |
1326 | goto out; | |
1327 | } | |
1328 | mld = (struct mld_msg *) icmp6_hdr(skb); | |
4715213d | 1329 | max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay)); |
08b202b6 YH |
1330 | if (max_delay) |
1331 | group = &mld->mld_mca; | |
248ba8ec | 1332 | } else { |
08b202b6 YH |
1333 | if (!pskb_may_pull(skb, sizeof(*mld2q))) { |
1334 | err = -EINVAL; | |
1335 | goto out; | |
1336 | } | |
1337 | mld2q = (struct mld2_query *)icmp6_hdr(skb); | |
1338 | if (!mld2q->mld2q_nsrcs) | |
1339 | group = &mld2q->mld2q_mca; | |
e3f5b170 DB |
1340 | |
1341 | max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL); | |
08b202b6 YH |
1342 | } |
1343 | ||
9ed973cc LL |
1344 | is_general_query = group && ipv6_addr_any(group); |
1345 | ||
dc4eb53a LL |
1346 | if (is_general_query) { |
1347 | saddr.proto = htons(ETH_P_IPV6); | |
1348 | saddr.u.ip6 = ip6h->saddr; | |
b00589af | 1349 | |
dc4eb53a LL |
1350 | br_multicast_query_received(br, port, &br->ip6_other_query, |
1351 | &saddr, max_delay); | |
08b202b6 | 1352 | goto out; |
6c03ee8b LL |
1353 | } else if (!group) { |
1354 | goto out; | |
dc4eb53a | 1355 | } |
08b202b6 | 1356 | |
b0e9a30d | 1357 | mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid); |
08b202b6 YH |
1358 | if (!mp) |
1359 | goto out; | |
1360 | ||
1361 | max_delay *= br->multicast_last_member_count; | |
8a870178 | 1362 | if (mp->mglist && |
08b202b6 YH |
1363 | (timer_pending(&mp->timer) ? |
1364 | time_after(mp->timer.expires, now + max_delay) : | |
1365 | try_to_del_timer_sync(&mp->timer) >= 0)) | |
1366 | mod_timer(&mp->timer, now + max_delay); | |
1367 | ||
e8051688 ED |
1368 | for (pp = &mp->ports; |
1369 | (p = mlock_dereference(*pp, br)) != NULL; | |
1370 | pp = &p->next) { | |
08b202b6 YH |
1371 | if (timer_pending(&p->timer) ? |
1372 | time_after(p->timer.expires, now + max_delay) : | |
1373 | try_to_del_timer_sync(&p->timer) >= 0) | |
24f9cdcb | 1374 | mod_timer(&p->timer, now + max_delay); |
08b202b6 YH |
1375 | } |
1376 | ||
1377 | out: | |
1378 | spin_unlock(&br->multicast_lock); | |
1379 | return err; | |
1380 | } | |
1381 | #endif | |
1382 | ||
90010b36 LL |
1383 | static void |
1384 | br_multicast_leave_group(struct net_bridge *br, | |
1385 | struct net_bridge_port *port, | |
1386 | struct br_ip *group, | |
1387 | struct bridge_mcast_other_query *other_query, | |
1388 | struct bridge_mcast_own_query *own_query) | |
eb1d1641 HX |
1389 | { |
1390 | struct net_bridge_mdb_htable *mdb; | |
1391 | struct net_bridge_mdb_entry *mp; | |
1392 | struct net_bridge_port_group *p; | |
1393 | unsigned long now; | |
1394 | unsigned long time; | |
1395 | ||
eb1d1641 HX |
1396 | spin_lock(&br->multicast_lock); |
1397 | if (!netif_running(br->dev) || | |
1398 | (port && port->state == BR_STATE_DISABLED) || | |
90010b36 | 1399 | timer_pending(&other_query->timer)) |
eb1d1641 HX |
1400 | goto out; |
1401 | ||
e8051688 | 1402 | mdb = mlock_dereference(br->mdb, br); |
eb1d1641 HX |
1403 | mp = br_mdb_ip_get(mdb, group); |
1404 | if (!mp) | |
1405 | goto out; | |
1406 | ||
cc0fdd80 | 1407 | if (br->multicast_querier) { |
6b7df111 CW |
1408 | __br_multicast_send_query(br, port, &mp->addr); |
1409 | ||
1410 | time = jiffies + br->multicast_last_member_count * | |
1411 | br->multicast_last_member_interval; | |
cc0fdd80 | 1412 | |
90010b36 | 1413 | mod_timer(&own_query->timer, time); |
6b7df111 CW |
1414 | |
1415 | for (p = mlock_dereference(mp->ports, br); | |
1416 | p != NULL; | |
1417 | p = mlock_dereference(p->next, br)) { | |
1418 | if (p->port != port) | |
1419 | continue; | |
1420 | ||
1421 | if (!hlist_unhashed(&p->mglist) && | |
1422 | (timer_pending(&p->timer) ? | |
1423 | time_after(p->timer.expires, time) : | |
1424 | try_to_del_timer_sync(&p->timer) >= 0)) { | |
1425 | mod_timer(&p->timer, time); | |
1426 | } | |
1427 | ||
1428 | break; | |
1429 | } | |
1430 | } | |
1431 | ||
c2d3babf | 1432 | if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) { |
50426b59 AW |
1433 | struct net_bridge_port_group __rcu **pp; |
1434 | ||
1435 | for (pp = &mp->ports; | |
1436 | (p = mlock_dereference(*pp, br)) != NULL; | |
1437 | pp = &p->next) { | |
1438 | if (p->port != port) | |
1439 | continue; | |
1440 | ||
1441 | rcu_assign_pointer(*pp, p->next); | |
1442 | hlist_del_init(&p->mglist); | |
1443 | del_timer(&p->timer); | |
09cf0211 NA |
1444 | br_mdb_notify(br->dev, port, group, RTM_DELMDB, |
1445 | p->state); | |
50426b59 AW |
1446 | call_rcu_bh(&p->rcu, br_multicast_free_pg); |
1447 | ||
454594f3 | 1448 | if (!mp->ports && !mp->mglist && |
50426b59 AW |
1449 | netif_running(br->dev)) |
1450 | mod_timer(&mp->timer, jiffies); | |
1451 | } | |
1452 | goto out; | |
1453 | } | |
1454 | ||
eb1d1641 HX |
1455 | now = jiffies; |
1456 | time = now + br->multicast_last_member_count * | |
1457 | br->multicast_last_member_interval; | |
1458 | ||
1459 | if (!port) { | |
454594f3 | 1460 | if (mp->mglist && |
eb1d1641 HX |
1461 | (timer_pending(&mp->timer) ? |
1462 | time_after(mp->timer.expires, time) : | |
1463 | try_to_del_timer_sync(&mp->timer) >= 0)) { | |
1464 | mod_timer(&mp->timer, time); | |
eb1d1641 | 1465 | } |
454594f3 LL |
1466 | |
1467 | goto out; | |
1468 | } | |
1469 | ||
1470 | for (p = mlock_dereference(mp->ports, br); | |
1471 | p != NULL; | |
1472 | p = mlock_dereference(p->next, br)) { | |
1473 | if (p->port != port) | |
1474 | continue; | |
1475 | ||
1476 | if (!hlist_unhashed(&p->mglist) && | |
1477 | (timer_pending(&p->timer) ? | |
1478 | time_after(p->timer.expires, time) : | |
1479 | try_to_del_timer_sync(&p->timer) >= 0)) { | |
1480 | mod_timer(&p->timer, time); | |
1481 | } | |
1482 | ||
1483 | break; | |
eb1d1641 | 1484 | } |
eb1d1641 HX |
1485 | out: |
1486 | spin_unlock(&br->multicast_lock); | |
1487 | } | |
1488 | ||
8ef2a9a5 YH |
1489 | static void br_ip4_multicast_leave_group(struct net_bridge *br, |
1490 | struct net_bridge_port *port, | |
b0e9a30d VY |
1491 | __be32 group, |
1492 | __u16 vid) | |
8ef2a9a5 YH |
1493 | { |
1494 | struct br_ip br_group; | |
90010b36 | 1495 | struct bridge_mcast_own_query *own_query; |
8ef2a9a5 YH |
1496 | |
1497 | if (ipv4_is_local_multicast(group)) | |
1498 | return; | |
1499 | ||
90010b36 LL |
1500 | own_query = port ? &port->ip4_own_query : &br->ip4_own_query; |
1501 | ||
8ef2a9a5 YH |
1502 | br_group.u.ip4 = group; |
1503 | br_group.proto = htons(ETH_P_IP); | |
b0e9a30d | 1504 | br_group.vid = vid; |
8ef2a9a5 | 1505 | |
90010b36 LL |
1506 | br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query, |
1507 | own_query); | |
8ef2a9a5 YH |
1508 | } |
1509 | ||
dfd56b8b | 1510 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1511 | static void br_ip6_multicast_leave_group(struct net_bridge *br, |
1512 | struct net_bridge_port *port, | |
b0e9a30d VY |
1513 | const struct in6_addr *group, |
1514 | __u16 vid) | |
08b202b6 YH |
1515 | { |
1516 | struct br_ip br_group; | |
90010b36 | 1517 | struct bridge_mcast_own_query *own_query; |
08b202b6 | 1518 | |
3c3769e6 | 1519 | if (ipv6_addr_is_ll_all_nodes(group)) |
08b202b6 YH |
1520 | return; |
1521 | ||
90010b36 LL |
1522 | own_query = port ? &port->ip6_own_query : &br->ip6_own_query; |
1523 | ||
4e3fd7a0 | 1524 | br_group.u.ip6 = *group; |
08b202b6 | 1525 | br_group.proto = htons(ETH_P_IPV6); |
b0e9a30d | 1526 | br_group.vid = vid; |
08b202b6 | 1527 | |
90010b36 LL |
1528 | br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query, |
1529 | own_query); | |
08b202b6 YH |
1530 | } |
1531 | #endif | |
8ef2a9a5 | 1532 | |
eb1d1641 HX |
1533 | static int br_multicast_ipv4_rcv(struct net_bridge *br, |
1534 | struct net_bridge_port *port, | |
06499098 VY |
1535 | struct sk_buff *skb, |
1536 | u16 vid) | |
eb1d1641 | 1537 | { |
9afd85c9 | 1538 | struct sk_buff *skb_trimmed = NULL; |
eb1d1641 | 1539 | struct igmphdr *ih; |
eb1d1641 HX |
1540 | int err; |
1541 | ||
9afd85c9 | 1542 | err = ip_mc_check_igmp(skb, &skb_trimmed); |
eb1d1641 | 1543 | |
9afd85c9 LL |
1544 | if (err == -ENOMSG) { |
1545 | if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) | |
bd4265fe | 1546 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
eb1d1641 | 1547 | return 0; |
9afd85c9 LL |
1548 | } else if (err < 0) { |
1549 | return err; | |
bd4265fe | 1550 | } |
eb1d1641 | 1551 | |
eb1d1641 | 1552 | BR_INPUT_SKB_CB(skb)->igmp = 1; |
9afd85c9 | 1553 | ih = igmp_hdr(skb); |
eb1d1641 HX |
1554 | |
1555 | switch (ih->type) { | |
1556 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1557 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
62b2bcb4 | 1558 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
b0e9a30d | 1559 | err = br_ip4_multicast_add_group(br, port, ih->group, vid); |
eb1d1641 HX |
1560 | break; |
1561 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
9afd85c9 | 1562 | err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid); |
eb1d1641 HX |
1563 | break; |
1564 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
9afd85c9 | 1565 | err = br_ip4_multicast_query(br, port, skb_trimmed, vid); |
eb1d1641 HX |
1566 | break; |
1567 | case IGMP_HOST_LEAVE_MESSAGE: | |
b0e9a30d | 1568 | br_ip4_multicast_leave_group(br, port, ih->group, vid); |
eb1d1641 HX |
1569 | break; |
1570 | } | |
1571 | ||
9afd85c9 LL |
1572 | if (skb_trimmed) |
1573 | kfree_skb(skb_trimmed); | |
1574 | ||
eb1d1641 HX |
1575 | return err; |
1576 | } | |
1577 | ||
dfd56b8b | 1578 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1579 | static int br_multicast_ipv6_rcv(struct net_bridge *br, |
1580 | struct net_bridge_port *port, | |
06499098 VY |
1581 | struct sk_buff *skb, |
1582 | u16 vid) | |
08b202b6 | 1583 | { |
9afd85c9 LL |
1584 | struct sk_buff *skb_trimmed = NULL; |
1585 | struct mld_msg *mld; | |
08b202b6 YH |
1586 | int err; |
1587 | ||
9afd85c9 | 1588 | err = ipv6_mc_check_mld(skb, &skb_trimmed); |
08b202b6 | 1589 | |
9afd85c9 LL |
1590 | if (err == -ENOMSG) { |
1591 | if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr)) | |
1592 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; | |
08b202b6 | 1593 | return 0; |
9afd85c9 LL |
1594 | } else if (err < 0) { |
1595 | return err; | |
08b202b6 YH |
1596 | } |
1597 | ||
08b202b6 | 1598 | BR_INPUT_SKB_CB(skb)->igmp = 1; |
9afd85c9 | 1599 | mld = (struct mld_msg *)skb_transport_header(skb); |
08b202b6 | 1600 | |
9afd85c9 | 1601 | switch (mld->mld_type) { |
08b202b6 | 1602 | case ICMPV6_MGM_REPORT: |
fc2af6c7 | 1603 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
b0e9a30d | 1604 | err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid); |
08b202b6 | 1605 | break; |
08b202b6 | 1606 | case ICMPV6_MLD2_REPORT: |
9afd85c9 | 1607 | err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid); |
08b202b6 YH |
1608 | break; |
1609 | case ICMPV6_MGM_QUERY: | |
9afd85c9 | 1610 | err = br_ip6_multicast_query(br, port, skb_trimmed, vid); |
08b202b6 YH |
1611 | break; |
1612 | case ICMPV6_MGM_REDUCTION: | |
b0e9a30d | 1613 | br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid); |
9afd85c9 | 1614 | break; |
08b202b6 YH |
1615 | } |
1616 | ||
9afd85c9 LL |
1617 | if (skb_trimmed) |
1618 | kfree_skb(skb_trimmed); | |
1619 | ||
08b202b6 YH |
1620 | return err; |
1621 | } | |
1622 | #endif | |
1623 | ||
eb1d1641 | 1624 | int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, |
06499098 | 1625 | struct sk_buff *skb, u16 vid) |
eb1d1641 | 1626 | { |
1fafc7a9 YH |
1627 | BR_INPUT_SKB_CB(skb)->igmp = 0; |
1628 | BR_INPUT_SKB_CB(skb)->mrouters_only = 0; | |
1629 | ||
eb1d1641 HX |
1630 | if (br->multicast_disabled) |
1631 | return 0; | |
1632 | ||
1633 | switch (skb->protocol) { | |
1634 | case htons(ETH_P_IP): | |
06499098 | 1635 | return br_multicast_ipv4_rcv(br, port, skb, vid); |
dfd56b8b | 1636 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 1637 | case htons(ETH_P_IPV6): |
06499098 | 1638 | return br_multicast_ipv6_rcv(br, port, skb, vid); |
08b202b6 | 1639 | #endif |
eb1d1641 HX |
1640 | } |
1641 | ||
1642 | return 0; | |
1643 | } | |
1644 | ||
cc0fdd80 | 1645 | static void br_multicast_query_expired(struct net_bridge *br, |
2cd41431 LL |
1646 | struct bridge_mcast_own_query *query, |
1647 | struct bridge_mcast_querier *querier) | |
cc0fdd80 LL |
1648 | { |
1649 | spin_lock(&br->multicast_lock); | |
1650 | if (query->startup_sent < br->multicast_startup_query_count) | |
1651 | query->startup_sent++; | |
1652 | ||
71d9f614 | 1653 | RCU_INIT_POINTER(querier->port, NULL); |
cc0fdd80 LL |
1654 | br_multicast_send_query(br, NULL, query); |
1655 | spin_unlock(&br->multicast_lock); | |
1656 | } | |
1657 | ||
1658 | static void br_ip4_multicast_query_expired(unsigned long data) | |
eb1d1641 HX |
1659 | { |
1660 | struct net_bridge *br = (void *)data; | |
1661 | ||
2cd41431 | 1662 | br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier); |
cc0fdd80 | 1663 | } |
eb1d1641 | 1664 | |
cc0fdd80 LL |
1665 | #if IS_ENABLED(CONFIG_IPV6) |
1666 | static void br_ip6_multicast_query_expired(unsigned long data) | |
1667 | { | |
1668 | struct net_bridge *br = (void *)data; | |
eb1d1641 | 1669 | |
2cd41431 | 1670 | br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier); |
eb1d1641 | 1671 | } |
cc0fdd80 | 1672 | #endif |
eb1d1641 HX |
1673 | |
1674 | void br_multicast_init(struct net_bridge *br) | |
1675 | { | |
1676 | br->hash_elasticity = 4; | |
1677 | br->hash_max = 512; | |
1678 | ||
1679 | br->multicast_router = 1; | |
c5c23260 | 1680 | br->multicast_querier = 0; |
1c8ad5bf | 1681 | br->multicast_query_use_ifaddr = 0; |
eb1d1641 HX |
1682 | br->multicast_last_member_count = 2; |
1683 | br->multicast_startup_query_count = 2; | |
1684 | ||
1685 | br->multicast_last_member_interval = HZ; | |
1686 | br->multicast_query_response_interval = 10 * HZ; | |
1687 | br->multicast_startup_query_interval = 125 * HZ / 4; | |
1688 | br->multicast_query_interval = 125 * HZ; | |
1689 | br->multicast_querier_interval = 255 * HZ; | |
1690 | br->multicast_membership_interval = 260 * HZ; | |
1691 | ||
90010b36 | 1692 | br->ip4_other_query.delay_time = 0; |
2cd41431 | 1693 | br->ip4_querier.port = NULL; |
cc0fdd80 | 1694 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 | 1695 | br->ip6_other_query.delay_time = 0; |
2cd41431 | 1696 | br->ip6_querier.port = NULL; |
cc0fdd80 | 1697 | #endif |
b00589af | 1698 | |
eb1d1641 HX |
1699 | spin_lock_init(&br->multicast_lock); |
1700 | setup_timer(&br->multicast_router_timer, | |
1701 | br_multicast_local_router_expired, 0); | |
90010b36 LL |
1702 | setup_timer(&br->ip4_other_query.timer, |
1703 | br_ip4_multicast_querier_expired, (unsigned long)br); | |
1704 | setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired, | |
eb1d1641 | 1705 | (unsigned long)br); |
cc0fdd80 | 1706 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 LL |
1707 | setup_timer(&br->ip6_other_query.timer, |
1708 | br_ip6_multicast_querier_expired, (unsigned long)br); | |
1709 | setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired, | |
cc0fdd80 LL |
1710 | (unsigned long)br); |
1711 | #endif | |
eb1d1641 HX |
1712 | } |
1713 | ||
cc0fdd80 | 1714 | static void __br_multicast_open(struct net_bridge *br, |
90010b36 | 1715 | struct bridge_mcast_own_query *query) |
eb1d1641 | 1716 | { |
cc0fdd80 | 1717 | query->startup_sent = 0; |
eb1d1641 HX |
1718 | |
1719 | if (br->multicast_disabled) | |
1720 | return; | |
1721 | ||
cc0fdd80 LL |
1722 | mod_timer(&query->timer, jiffies); |
1723 | } | |
1724 | ||
1725 | void br_multicast_open(struct net_bridge *br) | |
1726 | { | |
90010b36 | 1727 | __br_multicast_open(br, &br->ip4_own_query); |
cc0fdd80 | 1728 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 | 1729 | __br_multicast_open(br, &br->ip6_own_query); |
cc0fdd80 | 1730 | #endif |
eb1d1641 HX |
1731 | } |
1732 | ||
1733 | void br_multicast_stop(struct net_bridge *br) | |
1734 | { | |
1735 | struct net_bridge_mdb_htable *mdb; | |
1736 | struct net_bridge_mdb_entry *mp; | |
b67bfe0d | 1737 | struct hlist_node *n; |
eb1d1641 HX |
1738 | u32 ver; |
1739 | int i; | |
1740 | ||
1741 | del_timer_sync(&br->multicast_router_timer); | |
90010b36 LL |
1742 | del_timer_sync(&br->ip4_other_query.timer); |
1743 | del_timer_sync(&br->ip4_own_query.timer); | |
cc0fdd80 | 1744 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 LL |
1745 | del_timer_sync(&br->ip6_other_query.timer); |
1746 | del_timer_sync(&br->ip6_own_query.timer); | |
cc0fdd80 | 1747 | #endif |
eb1d1641 HX |
1748 | |
1749 | spin_lock_bh(&br->multicast_lock); | |
e8051688 | 1750 | mdb = mlock_dereference(br->mdb, br); |
eb1d1641 HX |
1751 | if (!mdb) |
1752 | goto out; | |
1753 | ||
1754 | br->mdb = NULL; | |
1755 | ||
1756 | ver = mdb->ver; | |
1757 | for (i = 0; i < mdb->max; i++) { | |
b67bfe0d | 1758 | hlist_for_each_entry_safe(mp, n, &mdb->mhash[i], |
eb1d1641 HX |
1759 | hlist[ver]) { |
1760 | del_timer(&mp->timer); | |
eb1d1641 HX |
1761 | call_rcu_bh(&mp->rcu, br_multicast_free_group); |
1762 | } | |
1763 | } | |
1764 | ||
1765 | if (mdb->old) { | |
1766 | spin_unlock_bh(&br->multicast_lock); | |
10cc2b50 | 1767 | rcu_barrier_bh(); |
eb1d1641 HX |
1768 | spin_lock_bh(&br->multicast_lock); |
1769 | WARN_ON(mdb->old); | |
1770 | } | |
1771 | ||
1772 | mdb->old = mdb; | |
1773 | call_rcu_bh(&mdb->rcu, br_mdb_free); | |
1774 | ||
1775 | out: | |
1776 | spin_unlock_bh(&br->multicast_lock); | |
1777 | } | |
0909e117 HX |
1778 | |
1779 | int br_multicast_set_router(struct net_bridge *br, unsigned long val) | |
1780 | { | |
6ae4ae8e | 1781 | int err = -EINVAL; |
0909e117 HX |
1782 | |
1783 | spin_lock_bh(&br->multicast_lock); | |
0909e117 HX |
1784 | |
1785 | switch (val) { | |
1786 | case 0: | |
1787 | case 2: | |
1788 | del_timer(&br->multicast_router_timer); | |
1789 | /* fall through */ | |
1790 | case 1: | |
1791 | br->multicast_router = val; | |
1792 | err = 0; | |
1793 | break; | |
0909e117 HX |
1794 | } |
1795 | ||
0909e117 HX |
1796 | spin_unlock_bh(&br->multicast_lock); |
1797 | ||
1798 | return err; | |
1799 | } | |
1800 | ||
1801 | int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) | |
1802 | { | |
1803 | struct net_bridge *br = p->br; | |
6ae4ae8e | 1804 | int err = -EINVAL; |
0909e117 HX |
1805 | |
1806 | spin_lock(&br->multicast_lock); | |
0909e117 HX |
1807 | |
1808 | switch (val) { | |
1809 | case 0: | |
1810 | case 1: | |
1811 | case 2: | |
1812 | p->multicast_router = val; | |
1813 | err = 0; | |
1814 | ||
1815 | if (val < 2 && !hlist_unhashed(&p->rlist)) | |
1816 | hlist_del_init_rcu(&p->rlist); | |
1817 | ||
1818 | if (val == 1) | |
1819 | break; | |
1820 | ||
1821 | del_timer(&p->multicast_router_timer); | |
1822 | ||
1823 | if (val == 0) | |
1824 | break; | |
1825 | ||
1826 | br_multicast_add_router(br, p); | |
1827 | break; | |
0909e117 HX |
1828 | } |
1829 | ||
0909e117 HX |
1830 | spin_unlock(&br->multicast_lock); |
1831 | ||
1832 | return err; | |
1833 | } | |
561f1103 | 1834 | |
cc0fdd80 | 1835 | static void br_multicast_start_querier(struct net_bridge *br, |
90010b36 | 1836 | struct bridge_mcast_own_query *query) |
561f1103 HX |
1837 | { |
1838 | struct net_bridge_port *port; | |
74857216 | 1839 | |
cc0fdd80 | 1840 | __br_multicast_open(br, query); |
74857216 HX |
1841 | |
1842 | list_for_each_entry(port, &br->port_list, list) { | |
1843 | if (port->state == BR_STATE_DISABLED || | |
1844 | port->state == BR_STATE_BLOCKING) | |
1845 | continue; | |
1846 | ||
90010b36 LL |
1847 | if (query == &br->ip4_own_query) |
1848 | br_multicast_enable(&port->ip4_own_query); | |
cc0fdd80 LL |
1849 | #if IS_ENABLED(CONFIG_IPV6) |
1850 | else | |
90010b36 | 1851 | br_multicast_enable(&port->ip6_own_query); |
cc0fdd80 | 1852 | #endif |
74857216 HX |
1853 | } |
1854 | } | |
1855 | ||
1856 | int br_multicast_toggle(struct net_bridge *br, unsigned long val) | |
1857 | { | |
3a7fda06 | 1858 | int err = 0; |
e8051688 | 1859 | struct net_bridge_mdb_htable *mdb; |
561f1103 | 1860 | |
ef5e0d82 | 1861 | spin_lock_bh(&br->multicast_lock); |
561f1103 HX |
1862 | if (br->multicast_disabled == !val) |
1863 | goto unlock; | |
1864 | ||
1865 | br->multicast_disabled = !val; | |
1866 | if (br->multicast_disabled) | |
1867 | goto unlock; | |
1868 | ||
3a7fda06 HX |
1869 | if (!netif_running(br->dev)) |
1870 | goto unlock; | |
1871 | ||
e8051688 ED |
1872 | mdb = mlock_dereference(br->mdb, br); |
1873 | if (mdb) { | |
1874 | if (mdb->old) { | |
561f1103 HX |
1875 | err = -EEXIST; |
1876 | rollback: | |
1877 | br->multicast_disabled = !!val; | |
1878 | goto unlock; | |
1879 | } | |
1880 | ||
e8051688 | 1881 | err = br_mdb_rehash(&br->mdb, mdb->max, |
561f1103 HX |
1882 | br->hash_elasticity); |
1883 | if (err) | |
1884 | goto rollback; | |
1885 | } | |
1886 | ||
90010b36 | 1887 | br_multicast_start_querier(br, &br->ip4_own_query); |
cc0fdd80 | 1888 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 | 1889 | br_multicast_start_querier(br, &br->ip6_own_query); |
cc0fdd80 | 1890 | #endif |
561f1103 HX |
1891 | |
1892 | unlock: | |
ef5e0d82 | 1893 | spin_unlock_bh(&br->multicast_lock); |
561f1103 HX |
1894 | |
1895 | return err; | |
1896 | } | |
b195167f | 1897 | |
c5c23260 HX |
1898 | int br_multicast_set_querier(struct net_bridge *br, unsigned long val) |
1899 | { | |
b00589af LL |
1900 | unsigned long max_delay; |
1901 | ||
c5c23260 HX |
1902 | val = !!val; |
1903 | ||
1904 | spin_lock_bh(&br->multicast_lock); | |
1905 | if (br->multicast_querier == val) | |
1906 | goto unlock; | |
1907 | ||
1908 | br->multicast_querier = val; | |
b00589af LL |
1909 | if (!val) |
1910 | goto unlock; | |
1911 | ||
1912 | max_delay = br->multicast_query_response_interval; | |
b00589af | 1913 | |
90010b36 LL |
1914 | if (!timer_pending(&br->ip4_other_query.timer)) |
1915 | br->ip4_other_query.delay_time = jiffies + max_delay; | |
cc0fdd80 | 1916 | |
90010b36 | 1917 | br_multicast_start_querier(br, &br->ip4_own_query); |
cc0fdd80 LL |
1918 | |
1919 | #if IS_ENABLED(CONFIG_IPV6) | |
90010b36 LL |
1920 | if (!timer_pending(&br->ip6_other_query.timer)) |
1921 | br->ip6_other_query.delay_time = jiffies + max_delay; | |
cc0fdd80 | 1922 | |
90010b36 | 1923 | br_multicast_start_querier(br, &br->ip6_own_query); |
cc0fdd80 | 1924 | #endif |
c5c23260 HX |
1925 | |
1926 | unlock: | |
1927 | spin_unlock_bh(&br->multicast_lock); | |
1928 | ||
1929 | return 0; | |
1930 | } | |
1931 | ||
b195167f HX |
1932 | int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) |
1933 | { | |
6ae4ae8e | 1934 | int err = -EINVAL; |
b195167f | 1935 | u32 old; |
e8051688 | 1936 | struct net_bridge_mdb_htable *mdb; |
b195167f | 1937 | |
fe0d692b | 1938 | spin_lock_bh(&br->multicast_lock); |
b195167f HX |
1939 | if (!is_power_of_2(val)) |
1940 | goto unlock; | |
e8051688 ED |
1941 | |
1942 | mdb = mlock_dereference(br->mdb, br); | |
1943 | if (mdb && val < mdb->size) | |
b195167f HX |
1944 | goto unlock; |
1945 | ||
1946 | err = 0; | |
1947 | ||
1948 | old = br->hash_max; | |
1949 | br->hash_max = val; | |
1950 | ||
e8051688 ED |
1951 | if (mdb) { |
1952 | if (mdb->old) { | |
b195167f HX |
1953 | err = -EEXIST; |
1954 | rollback: | |
1955 | br->hash_max = old; | |
1956 | goto unlock; | |
1957 | } | |
1958 | ||
1959 | err = br_mdb_rehash(&br->mdb, br->hash_max, | |
1960 | br->hash_elasticity); | |
1961 | if (err) | |
1962 | goto rollback; | |
1963 | } | |
1964 | ||
1965 | unlock: | |
fe0d692b | 1966 | spin_unlock_bh(&br->multicast_lock); |
b195167f HX |
1967 | |
1968 | return err; | |
1969 | } | |
07f8ac4a LL |
1970 | |
1971 | /** | |
1972 | * br_multicast_list_adjacent - Returns snooped multicast addresses | |
1973 | * @dev: The bridge port adjacent to which to retrieve addresses | |
1974 | * @br_ip_list: The list to store found, snooped multicast IP addresses in | |
1975 | * | |
1976 | * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast | |
1977 | * snooping feature on all bridge ports of dev's bridge device, excluding | |
1978 | * the addresses from dev itself. | |
1979 | * | |
1980 | * Returns the number of items added to br_ip_list. | |
1981 | * | |
1982 | * Notes: | |
1983 | * - br_ip_list needs to be initialized by caller | |
1984 | * - br_ip_list might contain duplicates in the end | |
1985 | * (needs to be taken care of by caller) | |
1986 | * - br_ip_list needs to be freed by caller | |
1987 | */ | |
1988 | int br_multicast_list_adjacent(struct net_device *dev, | |
1989 | struct list_head *br_ip_list) | |
1990 | { | |
1991 | struct net_bridge *br; | |
1992 | struct net_bridge_port *port; | |
1993 | struct net_bridge_port_group *group; | |
1994 | struct br_ip_list *entry; | |
1995 | int count = 0; | |
1996 | ||
1997 | rcu_read_lock(); | |
1998 | if (!br_ip_list || !br_port_exists(dev)) | |
1999 | goto unlock; | |
2000 | ||
2001 | port = br_port_get_rcu(dev); | |
2002 | if (!port || !port->br) | |
2003 | goto unlock; | |
2004 | ||
2005 | br = port->br; | |
2006 | ||
2007 | list_for_each_entry_rcu(port, &br->port_list, list) { | |
2008 | if (!port->dev || port->dev == dev) | |
2009 | continue; | |
2010 | ||
2011 | hlist_for_each_entry_rcu(group, &port->mglist, mglist) { | |
2012 | entry = kmalloc(sizeof(*entry), GFP_ATOMIC); | |
2013 | if (!entry) | |
2014 | goto unlock; | |
2015 | ||
2016 | entry->addr = group->addr; | |
2017 | list_add(&entry->list, br_ip_list); | |
2018 | count++; | |
2019 | } | |
2020 | } | |
2021 | ||
2022 | unlock: | |
2023 | rcu_read_unlock(); | |
2024 | return count; | |
2025 | } | |
2026 | EXPORT_SYMBOL_GPL(br_multicast_list_adjacent); | |
2cd41431 | 2027 | |
c34963e2 LL |
2028 | /** |
2029 | * br_multicast_has_querier_anywhere - Checks for a querier on a bridge | |
2030 | * @dev: The bridge port providing the bridge on which to check for a querier | |
2031 | * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 | |
2032 | * | |
2033 | * Checks whether the given interface has a bridge on top and if so returns | |
2034 | * true if a valid querier exists anywhere on the bridged link layer. | |
2035 | * Otherwise returns false. | |
2036 | */ | |
2037 | bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto) | |
2038 | { | |
2039 | struct net_bridge *br; | |
2040 | struct net_bridge_port *port; | |
2041 | struct ethhdr eth; | |
2042 | bool ret = false; | |
2043 | ||
2044 | rcu_read_lock(); | |
2045 | if (!br_port_exists(dev)) | |
2046 | goto unlock; | |
2047 | ||
2048 | port = br_port_get_rcu(dev); | |
2049 | if (!port || !port->br) | |
2050 | goto unlock; | |
2051 | ||
2052 | br = port->br; | |
2053 | ||
2054 | memset(ð, 0, sizeof(eth)); | |
2055 | eth.h_proto = htons(proto); | |
2056 | ||
2057 | ret = br_multicast_querier_exists(br, ð); | |
2058 | ||
2059 | unlock: | |
2060 | rcu_read_unlock(); | |
2061 | return ret; | |
2062 | } | |
2063 | EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere); | |
2064 | ||
2cd41431 LL |
2065 | /** |
2066 | * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port | |
2067 | * @dev: The bridge port adjacent to which to check for a querier | |
2068 | * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 | |
2069 | * | |
2070 | * Checks whether the given interface has a bridge on top and if so returns | |
2071 | * true if a selected querier is behind one of the other ports of this | |
2072 | * bridge. Otherwise returns false. | |
2073 | */ | |
2074 | bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto) | |
2075 | { | |
2076 | struct net_bridge *br; | |
2077 | struct net_bridge_port *port; | |
2078 | bool ret = false; | |
2079 | ||
2080 | rcu_read_lock(); | |
2081 | if (!br_port_exists(dev)) | |
2082 | goto unlock; | |
2083 | ||
2084 | port = br_port_get_rcu(dev); | |
2085 | if (!port || !port->br) | |
2086 | goto unlock; | |
2087 | ||
2088 | br = port->br; | |
2089 | ||
2090 | switch (proto) { | |
2091 | case ETH_P_IP: | |
2092 | if (!timer_pending(&br->ip4_other_query.timer) || | |
2093 | rcu_dereference(br->ip4_querier.port) == port) | |
2094 | goto unlock; | |
2095 | break; | |
3993c4e1 | 2096 | #if IS_ENABLED(CONFIG_IPV6) |
2cd41431 LL |
2097 | case ETH_P_IPV6: |
2098 | if (!timer_pending(&br->ip6_other_query.timer) || | |
2099 | rcu_dereference(br->ip6_querier.port) == port) | |
2100 | goto unlock; | |
2101 | break; | |
3993c4e1 | 2102 | #endif |
2cd41431 LL |
2103 | default: |
2104 | goto unlock; | |
2105 | } | |
2106 | ||
2107 | ret = true; | |
2108 | unlock: | |
2109 | rcu_read_unlock(); | |
2110 | return ret; | |
2111 | } | |
2112 | EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent); |