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); | |
eb1d1641 HX |
276 | call_rcu_bh(&p->rcu, br_multicast_free_pg); |
277 | ||
454594f3 | 278 | if (!mp->ports && !mp->mglist && |
eb1d1641 HX |
279 | netif_running(br->dev)) |
280 | mod_timer(&mp->timer, jiffies); | |
281 | ||
282 | return; | |
283 | } | |
284 | ||
285 | WARN_ON(1); | |
286 | } | |
287 | ||
288 | static void br_multicast_port_group_expired(unsigned long data) | |
289 | { | |
290 | struct net_bridge_port_group *pg = (void *)data; | |
291 | struct net_bridge *br = pg->port->br; | |
292 | ||
293 | spin_lock(&br->multicast_lock); | |
294 | if (!netif_running(br->dev) || timer_pending(&pg->timer) || | |
ccb1c31a | 295 | hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT) |
eb1d1641 HX |
296 | goto out; |
297 | ||
298 | br_multicast_del_pg(br, pg); | |
299 | ||
300 | out: | |
301 | spin_unlock(&br->multicast_lock); | |
302 | } | |
303 | ||
e8051688 | 304 | static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max, |
eb1d1641 HX |
305 | int elasticity) |
306 | { | |
e8051688 | 307 | struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1); |
eb1d1641 HX |
308 | struct net_bridge_mdb_htable *mdb; |
309 | int err; | |
310 | ||
311 | mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC); | |
312 | if (!mdb) | |
313 | return -ENOMEM; | |
314 | ||
315 | mdb->max = max; | |
316 | mdb->old = old; | |
317 | ||
318 | mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC); | |
319 | if (!mdb->mhash) { | |
320 | kfree(mdb); | |
321 | return -ENOMEM; | |
322 | } | |
323 | ||
324 | mdb->size = old ? old->size : 0; | |
325 | mdb->ver = old ? old->ver ^ 1 : 0; | |
326 | ||
327 | if (!old || elasticity) | |
328 | get_random_bytes(&mdb->secret, sizeof(mdb->secret)); | |
329 | else | |
330 | mdb->secret = old->secret; | |
331 | ||
332 | if (!old) | |
333 | goto out; | |
334 | ||
335 | err = br_mdb_copy(mdb, old, elasticity); | |
336 | if (err) { | |
337 | kfree(mdb->mhash); | |
338 | kfree(mdb); | |
339 | return err; | |
340 | } | |
341 | ||
2ce297fc | 342 | br_mdb_rehash_seq++; |
eb1d1641 HX |
343 | call_rcu_bh(&mdb->rcu, br_mdb_free); |
344 | ||
345 | out: | |
346 | rcu_assign_pointer(*mdbp, mdb); | |
347 | ||
348 | return 0; | |
349 | } | |
350 | ||
8ef2a9a5 YH |
351 | static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br, |
352 | __be32 group) | |
eb1d1641 HX |
353 | { |
354 | struct sk_buff *skb; | |
355 | struct igmphdr *ih; | |
356 | struct ethhdr *eth; | |
357 | struct iphdr *iph; | |
358 | ||
359 | skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) + | |
360 | sizeof(*ih) + 4); | |
361 | if (!skb) | |
362 | goto out; | |
363 | ||
364 | skb->protocol = htons(ETH_P_IP); | |
365 | ||
366 | skb_reset_mac_header(skb); | |
367 | eth = eth_hdr(skb); | |
368 | ||
e5a727f6 | 369 | ether_addr_copy(eth->h_source, br->dev->dev_addr); |
eb1d1641 HX |
370 | eth->h_dest[0] = 1; |
371 | eth->h_dest[1] = 0; | |
372 | eth->h_dest[2] = 0x5e; | |
373 | eth->h_dest[3] = 0; | |
374 | eth->h_dest[4] = 0; | |
375 | eth->h_dest[5] = 1; | |
376 | eth->h_proto = htons(ETH_P_IP); | |
377 | skb_put(skb, sizeof(*eth)); | |
378 | ||
379 | skb_set_network_header(skb, skb->len); | |
380 | iph = ip_hdr(skb); | |
381 | ||
382 | iph->version = 4; | |
383 | iph->ihl = 6; | |
384 | iph->tos = 0xc0; | |
385 | iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4); | |
386 | iph->id = 0; | |
387 | iph->frag_off = htons(IP_DF); | |
388 | iph->ttl = 1; | |
389 | iph->protocol = IPPROTO_IGMP; | |
1c8ad5bf CW |
390 | iph->saddr = br->multicast_query_use_ifaddr ? |
391 | inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0; | |
eb1d1641 HX |
392 | iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); |
393 | ((u8 *)&iph[1])[0] = IPOPT_RA; | |
394 | ((u8 *)&iph[1])[1] = 4; | |
395 | ((u8 *)&iph[1])[2] = 0; | |
396 | ((u8 *)&iph[1])[3] = 0; | |
397 | ip_send_check(iph); | |
398 | skb_put(skb, 24); | |
399 | ||
400 | skb_set_transport_header(skb, skb->len); | |
401 | ih = igmp_hdr(skb); | |
402 | ih->type = IGMP_HOST_MEMBERSHIP_QUERY; | |
403 | ih->code = (group ? br->multicast_last_member_interval : | |
404 | br->multicast_query_response_interval) / | |
405 | (HZ / IGMP_TIMER_SCALE); | |
406 | ih->group = group; | |
407 | ih->csum = 0; | |
408 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
409 | skb_put(skb, sizeof(*ih)); | |
410 | ||
411 | __skb_pull(skb, sizeof(*eth)); | |
412 | ||
413 | out: | |
414 | return skb; | |
415 | } | |
416 | ||
dfd56b8b | 417 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 418 | static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, |
b71d1d42 | 419 | const struct in6_addr *group) |
08b202b6 YH |
420 | { |
421 | struct sk_buff *skb; | |
422 | struct ipv6hdr *ip6h; | |
423 | struct mld_msg *mldq; | |
424 | struct ethhdr *eth; | |
425 | u8 *hopopt; | |
426 | unsigned long interval; | |
427 | ||
428 | skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) + | |
429 | 8 + sizeof(*mldq)); | |
430 | if (!skb) | |
431 | goto out; | |
432 | ||
433 | skb->protocol = htons(ETH_P_IPV6); | |
434 | ||
435 | /* Ethernet header */ | |
436 | skb_reset_mac_header(skb); | |
437 | eth = eth_hdr(skb); | |
438 | ||
e5a727f6 | 439 | ether_addr_copy(eth->h_source, br->dev->dev_addr); |
08b202b6 YH |
440 | eth->h_proto = htons(ETH_P_IPV6); |
441 | skb_put(skb, sizeof(*eth)); | |
442 | ||
443 | /* IPv6 header + HbH option */ | |
444 | skb_set_network_header(skb, skb->len); | |
445 | ip6h = ipv6_hdr(skb); | |
446 | ||
447 | *(__force __be32 *)ip6h = htonl(0x60000000); | |
76d66158 | 448 | ip6h->payload_len = htons(8 + sizeof(*mldq)); |
08b202b6 YH |
449 | ip6h->nexthdr = IPPROTO_HOPOPTS; |
450 | ip6h->hop_limit = 1; | |
a7bff75b | 451 | ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1)); |
d1d81d4c UW |
452 | if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0, |
453 | &ip6h->saddr)) { | |
454 | kfree_skb(skb); | |
455 | return NULL; | |
456 | } | |
36cff5a1 | 457 | ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); |
08b202b6 YH |
458 | |
459 | hopopt = (u8 *)(ip6h + 1); | |
460 | hopopt[0] = IPPROTO_ICMPV6; /* next hdr */ | |
461 | hopopt[1] = 0; /* length of HbH */ | |
462 | hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */ | |
463 | hopopt[3] = 2; /* Length of RA Option */ | |
464 | hopopt[4] = 0; /* Type = 0x0000 (MLD) */ | |
465 | hopopt[5] = 0; | |
1de5a71c EZ |
466 | hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */ |
467 | hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */ | |
08b202b6 YH |
468 | |
469 | skb_put(skb, sizeof(*ip6h) + 8); | |
470 | ||
471 | /* ICMPv6 */ | |
472 | skb_set_transport_header(skb, skb->len); | |
473 | mldq = (struct mld_msg *) icmp6_hdr(skb); | |
474 | ||
32de868c LL |
475 | interval = ipv6_addr_any(group) ? |
476 | br->multicast_query_response_interval : | |
477 | br->multicast_last_member_interval; | |
08b202b6 YH |
478 | |
479 | mldq->mld_type = ICMPV6_MGM_QUERY; | |
480 | mldq->mld_code = 0; | |
481 | mldq->mld_cksum = 0; | |
482 | mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); | |
483 | mldq->mld_reserved = 0; | |
4e3fd7a0 | 484 | mldq->mld_mca = *group; |
08b202b6 YH |
485 | |
486 | /* checksum */ | |
487 | mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
488 | sizeof(*mldq), IPPROTO_ICMPV6, | |
489 | csum_partial(mldq, | |
490 | sizeof(*mldq), 0)); | |
491 | skb_put(skb, sizeof(*mldq)); | |
492 | ||
493 | __skb_pull(skb, sizeof(*eth)); | |
494 | ||
495 | out: | |
496 | return skb; | |
497 | } | |
498 | #endif | |
499 | ||
8ef2a9a5 YH |
500 | static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, |
501 | struct br_ip *addr) | |
502 | { | |
503 | switch (addr->proto) { | |
504 | case htons(ETH_P_IP): | |
505 | return br_ip4_multicast_alloc_query(br, addr->u.ip4); | |
dfd56b8b | 506 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
507 | case htons(ETH_P_IPV6): |
508 | return br_ip6_multicast_alloc_query(br, &addr->u.ip6); | |
509 | #endif | |
8ef2a9a5 YH |
510 | } |
511 | return NULL; | |
512 | } | |
513 | ||
eb1d1641 | 514 | static struct net_bridge_mdb_entry *br_multicast_get_group( |
8ef2a9a5 YH |
515 | struct net_bridge *br, struct net_bridge_port *port, |
516 | struct br_ip *group, int hash) | |
eb1d1641 | 517 | { |
e8051688 | 518 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 | 519 | struct net_bridge_mdb_entry *mp; |
95c96174 ED |
520 | unsigned int count = 0; |
521 | unsigned int max; | |
eb1d1641 HX |
522 | int elasticity; |
523 | int err; | |
524 | ||
e8051688 | 525 | mdb = rcu_dereference_protected(br->mdb, 1); |
b67bfe0d | 526 | hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) { |
eb1d1641 | 527 | count++; |
8ef2a9a5 | 528 | if (unlikely(br_ip_equal(group, &mp->addr))) |
eb1d1641 | 529 | return mp; |
eb1d1641 HX |
530 | } |
531 | ||
532 | elasticity = 0; | |
533 | max = mdb->max; | |
534 | ||
535 | if (unlikely(count > br->hash_elasticity && count)) { | |
536 | if (net_ratelimit()) | |
28a16c97 | 537 | br_info(br, "Multicast hash table " |
538 | "chain limit reached: %s\n", | |
539 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
540 | |
541 | elasticity = br->hash_elasticity; | |
542 | } | |
543 | ||
544 | if (mdb->size >= max) { | |
545 | max *= 2; | |
036be6db TG |
546 | if (unlikely(max > br->hash_max)) { |
547 | br_warn(br, "Multicast hash table maximum of %d " | |
548 | "reached, disabling snooping: %s\n", | |
549 | br->hash_max, | |
550 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
551 | err = -E2BIG; |
552 | disable: | |
553 | br->multicast_disabled = 1; | |
554 | goto err; | |
555 | } | |
556 | } | |
557 | ||
558 | if (max > mdb->max || elasticity) { | |
559 | if (mdb->old) { | |
560 | if (net_ratelimit()) | |
28a16c97 | 561 | br_info(br, "Multicast hash table " |
562 | "on fire: %s\n", | |
563 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
564 | err = -EEXIST; |
565 | goto err; | |
566 | } | |
567 | ||
568 | err = br_mdb_rehash(&br->mdb, max, elasticity); | |
569 | if (err) { | |
28a16c97 | 570 | br_warn(br, "Cannot rehash multicast " |
571 | "hash table, disabling snooping: %s, %d, %d\n", | |
572 | port ? port->dev->name : br->dev->name, | |
573 | mdb->size, err); | |
eb1d1641 HX |
574 | goto disable; |
575 | } | |
576 | ||
577 | err = -EAGAIN; | |
578 | goto err; | |
579 | } | |
580 | ||
581 | return NULL; | |
582 | ||
583 | err: | |
584 | mp = ERR_PTR(err); | |
585 | return mp; | |
586 | } | |
587 | ||
cfd56754 CW |
588 | struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br, |
589 | struct net_bridge_port *port, struct br_ip *group) | |
eb1d1641 | 590 | { |
e8051688 | 591 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 HX |
592 | struct net_bridge_mdb_entry *mp; |
593 | int hash; | |
4c0833bc | 594 | int err; |
eb1d1641 | 595 | |
e8051688 | 596 | mdb = rcu_dereference_protected(br->mdb, 1); |
eb1d1641 | 597 | if (!mdb) { |
4c0833bc TK |
598 | err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0); |
599 | if (err) | |
600 | return ERR_PTR(err); | |
eb1d1641 HX |
601 | goto rehash; |
602 | } | |
603 | ||
604 | hash = br_ip_hash(mdb, group); | |
605 | mp = br_multicast_get_group(br, port, group, hash); | |
606 | switch (PTR_ERR(mp)) { | |
607 | case 0: | |
608 | break; | |
609 | ||
610 | case -EAGAIN: | |
611 | rehash: | |
e8051688 | 612 | mdb = rcu_dereference_protected(br->mdb, 1); |
eb1d1641 HX |
613 | hash = br_ip_hash(mdb, group); |
614 | break; | |
615 | ||
616 | default: | |
617 | goto out; | |
618 | } | |
619 | ||
620 | mp = kzalloc(sizeof(*mp), GFP_ATOMIC); | |
621 | if (unlikely(!mp)) | |
4c0833bc | 622 | return ERR_PTR(-ENOMEM); |
eb1d1641 HX |
623 | |
624 | mp->br = br; | |
8ef2a9a5 | 625 | mp->addr = *group; |
1faabf2a ED |
626 | setup_timer(&mp->timer, br_multicast_group_expired, |
627 | (unsigned long)mp); | |
628 | ||
eb1d1641 HX |
629 | hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]); |
630 | mdb->size++; | |
631 | ||
632 | out: | |
633 | return mp; | |
634 | } | |
635 | ||
cfd56754 CW |
636 | struct net_bridge_port_group *br_multicast_new_port_group( |
637 | struct net_bridge_port *port, | |
638 | struct br_ip *group, | |
ccb1c31a AW |
639 | struct net_bridge_port_group __rcu *next, |
640 | unsigned char state) | |
cfd56754 CW |
641 | { |
642 | struct net_bridge_port_group *p; | |
643 | ||
644 | p = kzalloc(sizeof(*p), GFP_ATOMIC); | |
645 | if (unlikely(!p)) | |
646 | return NULL; | |
647 | ||
648 | p->addr = *group; | |
649 | p->port = port; | |
ccb1c31a | 650 | p->state = state; |
eca2a43b | 651 | rcu_assign_pointer(p->next, next); |
cfd56754 CW |
652 | hlist_add_head(&p->mglist, &port->mglist); |
653 | setup_timer(&p->timer, br_multicast_port_group_expired, | |
654 | (unsigned long)p); | |
655 | return p; | |
656 | } | |
657 | ||
eb1d1641 | 658 | static int br_multicast_add_group(struct net_bridge *br, |
8ef2a9a5 YH |
659 | struct net_bridge_port *port, |
660 | struct br_ip *group) | |
eb1d1641 HX |
661 | { |
662 | struct net_bridge_mdb_entry *mp; | |
663 | struct net_bridge_port_group *p; | |
e8051688 | 664 | struct net_bridge_port_group __rcu **pp; |
454594f3 | 665 | unsigned long now = jiffies; |
eb1d1641 HX |
666 | int err; |
667 | ||
eb1d1641 HX |
668 | spin_lock(&br->multicast_lock); |
669 | if (!netif_running(br->dev) || | |
670 | (port && port->state == BR_STATE_DISABLED)) | |
671 | goto out; | |
672 | ||
673 | mp = br_multicast_new_group(br, port, group); | |
674 | err = PTR_ERR(mp); | |
4c0833bc | 675 | if (IS_ERR(mp)) |
eb1d1641 HX |
676 | goto err; |
677 | ||
678 | if (!port) { | |
8a870178 | 679 | mp->mglist = true; |
454594f3 | 680 | mod_timer(&mp->timer, now + br->multicast_membership_interval); |
eb1d1641 HX |
681 | goto out; |
682 | } | |
683 | ||
e8051688 ED |
684 | for (pp = &mp->ports; |
685 | (p = mlock_dereference(*pp, br)) != NULL; | |
686 | pp = &p->next) { | |
eb1d1641 | 687 | if (p->port == port) |
454594f3 | 688 | goto found; |
eb1d1641 HX |
689 | if ((unsigned long)p->port < (unsigned long)port) |
690 | break; | |
691 | } | |
692 | ||
ccb1c31a | 693 | p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY); |
eb1d1641 HX |
694 | if (unlikely(!p)) |
695 | goto err; | |
eb1d1641 | 696 | rcu_assign_pointer(*pp, p); |
37a393bc | 697 | br_mdb_notify(br->dev, port, group, RTM_NEWMDB); |
eb1d1641 | 698 | |
454594f3 LL |
699 | found: |
700 | mod_timer(&p->timer, now + br->multicast_membership_interval); | |
eb1d1641 HX |
701 | out: |
702 | err = 0; | |
703 | ||
704 | err: | |
705 | spin_unlock(&br->multicast_lock); | |
706 | return err; | |
707 | } | |
708 | ||
8ef2a9a5 YH |
709 | static int br_ip4_multicast_add_group(struct net_bridge *br, |
710 | struct net_bridge_port *port, | |
b0e9a30d VY |
711 | __be32 group, |
712 | __u16 vid) | |
8ef2a9a5 YH |
713 | { |
714 | struct br_ip br_group; | |
715 | ||
716 | if (ipv4_is_local_multicast(group)) | |
717 | return 0; | |
718 | ||
719 | br_group.u.ip4 = group; | |
720 | br_group.proto = htons(ETH_P_IP); | |
b0e9a30d | 721 | br_group.vid = vid; |
8ef2a9a5 YH |
722 | |
723 | return br_multicast_add_group(br, port, &br_group); | |
724 | } | |
725 | ||
dfd56b8b | 726 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
727 | static int br_ip6_multicast_add_group(struct net_bridge *br, |
728 | struct net_bridge_port *port, | |
b0e9a30d VY |
729 | const struct in6_addr *group, |
730 | __u16 vid) | |
08b202b6 YH |
731 | { |
732 | struct br_ip br_group; | |
733 | ||
3c3769e6 | 734 | if (ipv6_addr_is_ll_all_nodes(group)) |
08b202b6 YH |
735 | return 0; |
736 | ||
4e3fd7a0 | 737 | br_group.u.ip6 = *group; |
9cc6e0c4 | 738 | br_group.proto = htons(ETH_P_IPV6); |
b0e9a30d | 739 | br_group.vid = vid; |
08b202b6 YH |
740 | |
741 | return br_multicast_add_group(br, port, &br_group); | |
742 | } | |
743 | #endif | |
744 | ||
eb1d1641 HX |
745 | static void br_multicast_router_expired(unsigned long data) |
746 | { | |
747 | struct net_bridge_port *port = (void *)data; | |
748 | struct net_bridge *br = port->br; | |
749 | ||
750 | spin_lock(&br->multicast_lock); | |
751 | if (port->multicast_router != 1 || | |
752 | timer_pending(&port->multicast_router_timer) || | |
753 | hlist_unhashed(&port->rlist)) | |
754 | goto out; | |
755 | ||
756 | hlist_del_init_rcu(&port->rlist); | |
757 | ||
758 | out: | |
759 | spin_unlock(&br->multicast_lock); | |
760 | } | |
761 | ||
762 | static void br_multicast_local_router_expired(unsigned long data) | |
763 | { | |
764 | } | |
765 | ||
cc0fdd80 | 766 | static void br_multicast_querier_expired(struct net_bridge *br, |
90010b36 | 767 | struct bridge_mcast_own_query *query) |
c83b8fab | 768 | { |
c83b8fab HX |
769 | spin_lock(&br->multicast_lock); |
770 | if (!netif_running(br->dev) || br->multicast_disabled) | |
771 | goto out; | |
772 | ||
cc0fdd80 | 773 | br_multicast_start_querier(br, query); |
c83b8fab HX |
774 | |
775 | out: | |
776 | spin_unlock(&br->multicast_lock); | |
777 | } | |
778 | ||
cc0fdd80 LL |
779 | static void br_ip4_multicast_querier_expired(unsigned long data) |
780 | { | |
781 | struct net_bridge *br = (void *)data; | |
782 | ||
90010b36 | 783 | br_multicast_querier_expired(br, &br->ip4_own_query); |
cc0fdd80 LL |
784 | } |
785 | ||
786 | #if IS_ENABLED(CONFIG_IPV6) | |
787 | static void br_ip6_multicast_querier_expired(unsigned long data) | |
788 | { | |
789 | struct net_bridge *br = (void *)data; | |
790 | ||
90010b36 | 791 | br_multicast_querier_expired(br, &br->ip6_own_query); |
cc0fdd80 LL |
792 | } |
793 | #endif | |
794 | ||
dc4eb53a LL |
795 | static void br_multicast_select_own_querier(struct net_bridge *br, |
796 | struct br_ip *ip, | |
797 | struct sk_buff *skb) | |
798 | { | |
799 | if (ip->proto == htons(ETH_P_IP)) | |
800 | br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr; | |
801 | #if IS_ENABLED(CONFIG_IPV6) | |
802 | else | |
803 | br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr; | |
804 | #endif | |
805 | } | |
806 | ||
8ef2a9a5 YH |
807 | static void __br_multicast_send_query(struct net_bridge *br, |
808 | struct net_bridge_port *port, | |
809 | struct br_ip *ip) | |
eb1d1641 | 810 | { |
eb1d1641 HX |
811 | struct sk_buff *skb; |
812 | ||
8ef2a9a5 | 813 | skb = br_multicast_alloc_query(br, ip); |
eb1d1641 | 814 | if (!skb) |
8ef2a9a5 | 815 | return; |
eb1d1641 HX |
816 | |
817 | if (port) { | |
eb1d1641 | 818 | skb->dev = port->dev; |
7026b1dd DM |
819 | NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, NULL, skb, |
820 | NULL, skb->dev, | |
f0b4eece | 821 | br_dev_queue_push_xmit); |
dc4eb53a LL |
822 | } else { |
823 | br_multicast_select_own_querier(br, ip, skb); | |
eb1d1641 | 824 | netif_rx(skb); |
dc4eb53a | 825 | } |
8ef2a9a5 YH |
826 | } |
827 | ||
828 | static void br_multicast_send_query(struct net_bridge *br, | |
cc0fdd80 | 829 | struct net_bridge_port *port, |
90010b36 | 830 | struct bridge_mcast_own_query *own_query) |
8ef2a9a5 YH |
831 | { |
832 | unsigned long time; | |
833 | struct br_ip br_group; | |
90010b36 | 834 | struct bridge_mcast_other_query *other_query = NULL; |
8ef2a9a5 YH |
835 | |
836 | if (!netif_running(br->dev) || br->multicast_disabled || | |
cc0fdd80 | 837 | !br->multicast_querier) |
8ef2a9a5 YH |
838 | return; |
839 | ||
08b202b6 YH |
840 | memset(&br_group.u, 0, sizeof(br_group.u)); |
841 | ||
90010b36 LL |
842 | if (port ? (own_query == &port->ip4_own_query) : |
843 | (own_query == &br->ip4_own_query)) { | |
844 | other_query = &br->ip4_other_query; | |
cc0fdd80 | 845 | br_group.proto = htons(ETH_P_IP); |
dfd56b8b | 846 | #if IS_ENABLED(CONFIG_IPV6) |
cc0fdd80 | 847 | } else { |
90010b36 | 848 | other_query = &br->ip6_other_query; |
cc0fdd80 | 849 | br_group.proto = htons(ETH_P_IPV6); |
08b202b6 | 850 | #endif |
cc0fdd80 LL |
851 | } |
852 | ||
90010b36 | 853 | if (!other_query || timer_pending(&other_query->timer)) |
cc0fdd80 LL |
854 | return; |
855 | ||
856 | __br_multicast_send_query(br, port, &br_group); | |
eb1d1641 | 857 | |
eb1d1641 | 858 | time = jiffies; |
90010b36 | 859 | time += own_query->startup_sent < br->multicast_startup_query_count ? |
eb1d1641 HX |
860 | br->multicast_startup_query_interval : |
861 | br->multicast_query_interval; | |
90010b36 | 862 | mod_timer(&own_query->timer, time); |
eb1d1641 HX |
863 | } |
864 | ||
90010b36 LL |
865 | static void |
866 | br_multicast_port_query_expired(struct net_bridge_port *port, | |
867 | struct bridge_mcast_own_query *query) | |
eb1d1641 | 868 | { |
eb1d1641 HX |
869 | struct net_bridge *br = port->br; |
870 | ||
871 | spin_lock(&br->multicast_lock); | |
02a780c0 DC |
872 | if (port->state == BR_STATE_DISABLED || |
873 | port->state == BR_STATE_BLOCKING) | |
eb1d1641 HX |
874 | goto out; |
875 | ||
cc0fdd80 LL |
876 | if (query->startup_sent < br->multicast_startup_query_count) |
877 | query->startup_sent++; | |
eb1d1641 | 878 | |
cc0fdd80 | 879 | br_multicast_send_query(port->br, port, query); |
eb1d1641 HX |
880 | |
881 | out: | |
882 | spin_unlock(&br->multicast_lock); | |
883 | } | |
884 | ||
cc0fdd80 LL |
885 | static void br_ip4_multicast_port_query_expired(unsigned long data) |
886 | { | |
887 | struct net_bridge_port *port = (void *)data; | |
888 | ||
90010b36 | 889 | br_multicast_port_query_expired(port, &port->ip4_own_query); |
cc0fdd80 LL |
890 | } |
891 | ||
892 | #if IS_ENABLED(CONFIG_IPV6) | |
893 | static void br_ip6_multicast_port_query_expired(unsigned long data) | |
894 | { | |
895 | struct net_bridge_port *port = (void *)data; | |
896 | ||
90010b36 | 897 | br_multicast_port_query_expired(port, &port->ip6_own_query); |
cc0fdd80 LL |
898 | } |
899 | #endif | |
900 | ||
eb1d1641 HX |
901 | void br_multicast_add_port(struct net_bridge_port *port) |
902 | { | |
903 | port->multicast_router = 1; | |
904 | ||
905 | setup_timer(&port->multicast_router_timer, br_multicast_router_expired, | |
906 | (unsigned long)port); | |
90010b36 LL |
907 | setup_timer(&port->ip4_own_query.timer, |
908 | br_ip4_multicast_port_query_expired, (unsigned long)port); | |
cc0fdd80 | 909 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 LL |
910 | setup_timer(&port->ip6_own_query.timer, |
911 | br_ip6_multicast_port_query_expired, (unsigned long)port); | |
cc0fdd80 | 912 | #endif |
eb1d1641 HX |
913 | } |
914 | ||
915 | void br_multicast_del_port(struct net_bridge_port *port) | |
916 | { | |
917 | del_timer_sync(&port->multicast_router_timer); | |
918 | } | |
919 | ||
90010b36 | 920 | static void br_multicast_enable(struct bridge_mcast_own_query *query) |
561f1103 | 921 | { |
cc0fdd80 | 922 | query->startup_sent = 0; |
561f1103 | 923 | |
cc0fdd80 LL |
924 | if (try_to_del_timer_sync(&query->timer) >= 0 || |
925 | del_timer(&query->timer)) | |
926 | mod_timer(&query->timer, jiffies); | |
561f1103 HX |
927 | } |
928 | ||
eb1d1641 HX |
929 | void br_multicast_enable_port(struct net_bridge_port *port) |
930 | { | |
931 | struct net_bridge *br = port->br; | |
932 | ||
933 | spin_lock(&br->multicast_lock); | |
934 | if (br->multicast_disabled || !netif_running(br->dev)) | |
935 | goto out; | |
936 | ||
90010b36 | 937 | br_multicast_enable(&port->ip4_own_query); |
cc0fdd80 | 938 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 | 939 | br_multicast_enable(&port->ip6_own_query); |
cc0fdd80 | 940 | #endif |
754bc547 SA |
941 | if (port->multicast_router == 2 && hlist_unhashed(&port->rlist)) |
942 | br_multicast_add_router(br, port); | |
eb1d1641 HX |
943 | |
944 | out: | |
945 | spin_unlock(&br->multicast_lock); | |
946 | } | |
947 | ||
948 | void br_multicast_disable_port(struct net_bridge_port *port) | |
949 | { | |
950 | struct net_bridge *br = port->br; | |
951 | struct net_bridge_port_group *pg; | |
b67bfe0d | 952 | struct hlist_node *n; |
eb1d1641 HX |
953 | |
954 | spin_lock(&br->multicast_lock); | |
b67bfe0d | 955 | hlist_for_each_entry_safe(pg, n, &port->mglist, mglist) |
eb1d1641 HX |
956 | br_multicast_del_pg(br, pg); |
957 | ||
958 | if (!hlist_unhashed(&port->rlist)) | |
959 | hlist_del_init_rcu(&port->rlist); | |
960 | del_timer(&port->multicast_router_timer); | |
90010b36 | 961 | del_timer(&port->ip4_own_query.timer); |
cc0fdd80 | 962 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 | 963 | del_timer(&port->ip6_own_query.timer); |
cc0fdd80 | 964 | #endif |
eb1d1641 HX |
965 | spin_unlock(&br->multicast_lock); |
966 | } | |
967 | ||
8ef2a9a5 YH |
968 | static int br_ip4_multicast_igmp3_report(struct net_bridge *br, |
969 | struct net_bridge_port *port, | |
06499098 VY |
970 | struct sk_buff *skb, |
971 | u16 vid) | |
eb1d1641 HX |
972 | { |
973 | struct igmpv3_report *ih; | |
974 | struct igmpv3_grec *grec; | |
975 | int i; | |
976 | int len; | |
977 | int num; | |
978 | int type; | |
979 | int err = 0; | |
980 | __be32 group; | |
981 | ||
eb1d1641 HX |
982 | ih = igmpv3_report_hdr(skb); |
983 | num = ntohs(ih->ngrec); | |
984 | len = sizeof(*ih); | |
985 | ||
986 | for (i = 0; i < num; i++) { | |
987 | len += sizeof(*grec); | |
988 | if (!pskb_may_pull(skb, len)) | |
989 | return -EINVAL; | |
990 | ||
fd218cf9 | 991 | grec = (void *)(skb->data + len - sizeof(*grec)); |
eb1d1641 HX |
992 | group = grec->grec_mca; |
993 | type = grec->grec_type; | |
994 | ||
8eabf95c | 995 | len += ntohs(grec->grec_nsrcs) * 4; |
eb1d1641 HX |
996 | if (!pskb_may_pull(skb, len)) |
997 | return -EINVAL; | |
998 | ||
999 | /* We treat this as an IGMPv2 report for now. */ | |
1000 | switch (type) { | |
1001 | case IGMPV3_MODE_IS_INCLUDE: | |
1002 | case IGMPV3_MODE_IS_EXCLUDE: | |
1003 | case IGMPV3_CHANGE_TO_INCLUDE: | |
1004 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
1005 | case IGMPV3_ALLOW_NEW_SOURCES: | |
1006 | case IGMPV3_BLOCK_OLD_SOURCES: | |
1007 | break; | |
1008 | ||
1009 | default: | |
1010 | continue; | |
1011 | } | |
1012 | ||
b0e9a30d | 1013 | err = br_ip4_multicast_add_group(br, port, group, vid); |
eb1d1641 HX |
1014 | if (err) |
1015 | break; | |
1016 | } | |
1017 | ||
1018 | return err; | |
1019 | } | |
1020 | ||
dfd56b8b | 1021 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1022 | static int br_ip6_multicast_mld2_report(struct net_bridge *br, |
1023 | struct net_bridge_port *port, | |
06499098 VY |
1024 | struct sk_buff *skb, |
1025 | u16 vid) | |
08b202b6 YH |
1026 | { |
1027 | struct icmp6hdr *icmp6h; | |
1028 | struct mld2_grec *grec; | |
1029 | int i; | |
1030 | int len; | |
1031 | int num; | |
1032 | int err = 0; | |
1033 | ||
1034 | if (!pskb_may_pull(skb, sizeof(*icmp6h))) | |
1035 | return -EINVAL; | |
1036 | ||
1037 | icmp6h = icmp6_hdr(skb); | |
1038 | num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); | |
1039 | len = sizeof(*icmp6h); | |
1040 | ||
1041 | for (i = 0; i < num; i++) { | |
1042 | __be16 *nsrcs, _nsrcs; | |
1043 | ||
1044 | nsrcs = skb_header_pointer(skb, | |
1045 | len + offsetof(struct mld2_grec, | |
649e984d | 1046 | grec_nsrcs), |
08b202b6 YH |
1047 | sizeof(_nsrcs), &_nsrcs); |
1048 | if (!nsrcs) | |
1049 | return -EINVAL; | |
1050 | ||
1051 | if (!pskb_may_pull(skb, | |
1052 | len + sizeof(*grec) + | |
d41db9f3 | 1053 | sizeof(struct in6_addr) * ntohs(*nsrcs))) |
08b202b6 YH |
1054 | return -EINVAL; |
1055 | ||
1056 | grec = (struct mld2_grec *)(skb->data + len); | |
d41db9f3 LL |
1057 | len += sizeof(*grec) + |
1058 | sizeof(struct in6_addr) * ntohs(*nsrcs); | |
08b202b6 YH |
1059 | |
1060 | /* We treat these as MLDv1 reports for now. */ | |
1061 | switch (grec->grec_type) { | |
1062 | case MLD2_MODE_IS_INCLUDE: | |
1063 | case MLD2_MODE_IS_EXCLUDE: | |
1064 | case MLD2_CHANGE_TO_INCLUDE: | |
1065 | case MLD2_CHANGE_TO_EXCLUDE: | |
1066 | case MLD2_ALLOW_NEW_SOURCES: | |
1067 | case MLD2_BLOCK_OLD_SOURCES: | |
1068 | break; | |
1069 | ||
1070 | default: | |
1071 | continue; | |
1072 | } | |
1073 | ||
b0e9a30d VY |
1074 | err = br_ip6_multicast_add_group(br, port, &grec->grec_mca, |
1075 | vid); | |
47cc84ce | 1076 | if (err) |
08b202b6 YH |
1077 | break; |
1078 | } | |
1079 | ||
1080 | return err; | |
1081 | } | |
1082 | #endif | |
1083 | ||
dc4eb53a | 1084 | static bool br_ip4_multicast_select_querier(struct net_bridge *br, |
2cd41431 | 1085 | struct net_bridge_port *port, |
dc4eb53a LL |
1086 | __be32 saddr) |
1087 | { | |
1088 | if (!timer_pending(&br->ip4_own_query.timer) && | |
1089 | !timer_pending(&br->ip4_other_query.timer)) | |
1090 | goto update; | |
1091 | ||
1092 | if (!br->ip4_querier.addr.u.ip4) | |
1093 | goto update; | |
1094 | ||
1095 | if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4)) | |
1096 | goto update; | |
1097 | ||
1098 | return false; | |
1099 | ||
1100 | update: | |
1101 | br->ip4_querier.addr.u.ip4 = saddr; | |
1102 | ||
2cd41431 LL |
1103 | /* update protected by general multicast_lock by caller */ |
1104 | rcu_assign_pointer(br->ip4_querier.port, port); | |
1105 | ||
dc4eb53a LL |
1106 | return true; |
1107 | } | |
1108 | ||
1109 | #if IS_ENABLED(CONFIG_IPV6) | |
1110 | static bool br_ip6_multicast_select_querier(struct net_bridge *br, | |
2cd41431 | 1111 | struct net_bridge_port *port, |
dc4eb53a LL |
1112 | struct in6_addr *saddr) |
1113 | { | |
1114 | if (!timer_pending(&br->ip6_own_query.timer) && | |
1115 | !timer_pending(&br->ip6_other_query.timer)) | |
1116 | goto update; | |
1117 | ||
1118 | if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0) | |
1119 | goto update; | |
1120 | ||
1121 | return false; | |
1122 | ||
1123 | update: | |
1124 | br->ip6_querier.addr.u.ip6 = *saddr; | |
1125 | ||
2cd41431 LL |
1126 | /* update protected by general multicast_lock by caller */ |
1127 | rcu_assign_pointer(br->ip6_querier.port, port); | |
1128 | ||
dc4eb53a LL |
1129 | return true; |
1130 | } | |
1131 | #endif | |
1132 | ||
1133 | static bool br_multicast_select_querier(struct net_bridge *br, | |
2cd41431 | 1134 | struct net_bridge_port *port, |
dc4eb53a LL |
1135 | struct br_ip *saddr) |
1136 | { | |
1137 | switch (saddr->proto) { | |
1138 | case htons(ETH_P_IP): | |
2cd41431 | 1139 | return br_ip4_multicast_select_querier(br, port, saddr->u.ip4); |
dc4eb53a LL |
1140 | #if IS_ENABLED(CONFIG_IPV6) |
1141 | case htons(ETH_P_IPV6): | |
2cd41431 | 1142 | return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6); |
dc4eb53a LL |
1143 | #endif |
1144 | } | |
1145 | ||
1146 | return false; | |
1147 | } | |
1148 | ||
cc0fdd80 | 1149 | static void |
90010b36 LL |
1150 | br_multicast_update_query_timer(struct net_bridge *br, |
1151 | struct bridge_mcast_other_query *query, | |
1152 | unsigned long max_delay) | |
b00589af | 1153 | { |
90010b36 LL |
1154 | if (!timer_pending(&query->timer)) |
1155 | query->delay_time = jiffies + max_delay; | |
b00589af | 1156 | |
90010b36 | 1157 | mod_timer(&query->timer, jiffies + br->multicast_querier_interval); |
b00589af LL |
1158 | } |
1159 | ||
7e80c124 | 1160 | /* |
7c77602f | 1161 | * Add port to router_list |
7e80c124 | 1162 | * list is maintained ordered by pointer value |
1163 | * and locked by br->multicast_lock and RCU | |
1164 | */ | |
0909e117 HX |
1165 | static void br_multicast_add_router(struct net_bridge *br, |
1166 | struct net_bridge_port *port) | |
1167 | { | |
dcdca2c4 | 1168 | struct net_bridge_port *p; |
b67bfe0d | 1169 | struct hlist_node *slot = NULL; |
dcdca2c4 | 1170 | |
1a040eac NA |
1171 | if (!hlist_unhashed(&port->rlist)) |
1172 | return; | |
1173 | ||
b67bfe0d | 1174 | hlist_for_each_entry(p, &br->router_list, rlist) { |
7e80c124 | 1175 | if ((unsigned long) port >= (unsigned long) p) |
1176 | break; | |
b67bfe0d | 1177 | slot = &p->rlist; |
dcdca2c4 | 1178 | } |
1179 | ||
7e80c124 | 1180 | if (slot) |
1d023284 | 1181 | hlist_add_behind_rcu(&port->rlist, slot); |
dcdca2c4 | 1182 | else |
1183 | hlist_add_head_rcu(&port->rlist, &br->router_list); | |
0909e117 HX |
1184 | } |
1185 | ||
eb1d1641 HX |
1186 | static void br_multicast_mark_router(struct net_bridge *br, |
1187 | struct net_bridge_port *port) | |
1188 | { | |
1189 | unsigned long now = jiffies; | |
eb1d1641 HX |
1190 | |
1191 | if (!port) { | |
1192 | if (br->multicast_router == 1) | |
1193 | mod_timer(&br->multicast_router_timer, | |
1194 | now + br->multicast_querier_interval); | |
1195 | return; | |
1196 | } | |
1197 | ||
1198 | if (port->multicast_router != 1) | |
1199 | return; | |
1200 | ||
0909e117 | 1201 | br_multicast_add_router(br, port); |
eb1d1641 | 1202 | |
eb1d1641 HX |
1203 | mod_timer(&port->multicast_router_timer, |
1204 | now + br->multicast_querier_interval); | |
1205 | } | |
1206 | ||
1207 | static void br_multicast_query_received(struct net_bridge *br, | |
1208 | struct net_bridge_port *port, | |
90010b36 | 1209 | struct bridge_mcast_other_query *query, |
dc4eb53a | 1210 | struct br_ip *saddr, |
b00589af | 1211 | unsigned long max_delay) |
eb1d1641 | 1212 | { |
2cd41431 | 1213 | if (!br_multicast_select_querier(br, port, saddr)) |
eb1d1641 HX |
1214 | return; |
1215 | ||
dc4eb53a | 1216 | br_multicast_update_query_timer(br, query, max_delay); |
eb1d1641 HX |
1217 | br_multicast_mark_router(br, port); |
1218 | } | |
1219 | ||
8ef2a9a5 YH |
1220 | static int br_ip4_multicast_query(struct net_bridge *br, |
1221 | struct net_bridge_port *port, | |
06499098 VY |
1222 | struct sk_buff *skb, |
1223 | u16 vid) | |
eb1d1641 | 1224 | { |
b71d1d42 | 1225 | const struct iphdr *iph = ip_hdr(skb); |
eb1d1641 HX |
1226 | struct igmphdr *ih = igmp_hdr(skb); |
1227 | struct net_bridge_mdb_entry *mp; | |
1228 | struct igmpv3_query *ih3; | |
1229 | struct net_bridge_port_group *p; | |
e8051688 | 1230 | struct net_bridge_port_group __rcu **pp; |
dc4eb53a | 1231 | struct br_ip saddr; |
eb1d1641 HX |
1232 | unsigned long max_delay; |
1233 | unsigned long now = jiffies; | |
1234 | __be32 group; | |
bec68ff1 | 1235 | int err = 0; |
eb1d1641 HX |
1236 | |
1237 | spin_lock(&br->multicast_lock); | |
1238 | if (!netif_running(br->dev) || | |
1239 | (port && port->state == BR_STATE_DISABLED)) | |
1240 | goto out; | |
1241 | ||
eb1d1641 HX |
1242 | group = ih->group; |
1243 | ||
1244 | if (skb->len == sizeof(*ih)) { | |
1245 | max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); | |
1246 | ||
1247 | if (!max_delay) { | |
1248 | max_delay = 10 * HZ; | |
1249 | group = 0; | |
1250 | } | |
9afd85c9 | 1251 | } else if (skb->len >= sizeof(*ih3)) { |
eb1d1641 HX |
1252 | ih3 = igmpv3_query_hdr(skb); |
1253 | if (ih3->nsrcs) | |
bec68ff1 | 1254 | goto out; |
eb1d1641 | 1255 | |
0ba8c9ec YH |
1256 | max_delay = ih3->code ? |
1257 | IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; | |
9afd85c9 | 1258 | } else { |
9ed973cc LL |
1259 | goto out; |
1260 | } | |
1261 | ||
dc4eb53a LL |
1262 | if (!group) { |
1263 | saddr.proto = htons(ETH_P_IP); | |
1264 | saddr.u.ip4 = iph->saddr; | |
b00589af | 1265 | |
dc4eb53a LL |
1266 | br_multicast_query_received(br, port, &br->ip4_other_query, |
1267 | &saddr, max_delay); | |
eb1d1641 | 1268 | goto out; |
dc4eb53a | 1269 | } |
eb1d1641 | 1270 | |
b0e9a30d | 1271 | mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid); |
eb1d1641 HX |
1272 | if (!mp) |
1273 | goto out; | |
1274 | ||
1275 | max_delay *= br->multicast_last_member_count; | |
1276 | ||
8a870178 | 1277 | if (mp->mglist && |
eb1d1641 HX |
1278 | (timer_pending(&mp->timer) ? |
1279 | time_after(mp->timer.expires, now + max_delay) : | |
1280 | try_to_del_timer_sync(&mp->timer) >= 0)) | |
1281 | mod_timer(&mp->timer, now + max_delay); | |
1282 | ||
e8051688 ED |
1283 | for (pp = &mp->ports; |
1284 | (p = mlock_dereference(*pp, br)) != NULL; | |
1285 | pp = &p->next) { | |
eb1d1641 HX |
1286 | if (timer_pending(&p->timer) ? |
1287 | time_after(p->timer.expires, now + max_delay) : | |
1288 | try_to_del_timer_sync(&p->timer) >= 0) | |
24f9cdcb | 1289 | mod_timer(&p->timer, now + max_delay); |
eb1d1641 HX |
1290 | } |
1291 | ||
1292 | out: | |
1293 | spin_unlock(&br->multicast_lock); | |
bec68ff1 | 1294 | return err; |
eb1d1641 HX |
1295 | } |
1296 | ||
dfd56b8b | 1297 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1298 | static int br_ip6_multicast_query(struct net_bridge *br, |
1299 | struct net_bridge_port *port, | |
06499098 VY |
1300 | struct sk_buff *skb, |
1301 | u16 vid) | |
08b202b6 | 1302 | { |
b71d1d42 | 1303 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
eca2a43b | 1304 | struct mld_msg *mld; |
08b202b6 YH |
1305 | struct net_bridge_mdb_entry *mp; |
1306 | struct mld2_query *mld2q; | |
e8051688 ED |
1307 | struct net_bridge_port_group *p; |
1308 | struct net_bridge_port_group __rcu **pp; | |
dc4eb53a | 1309 | struct br_ip saddr; |
08b202b6 YH |
1310 | unsigned long max_delay; |
1311 | unsigned long now = jiffies; | |
b71d1d42 | 1312 | const struct in6_addr *group = NULL; |
9ed973cc | 1313 | bool is_general_query; |
08b202b6 YH |
1314 | int err = 0; |
1315 | ||
1316 | spin_lock(&br->multicast_lock); | |
1317 | if (!netif_running(br->dev) || | |
1318 | (port && port->state == BR_STATE_DISABLED)) | |
1319 | goto out; | |
1320 | ||
08b202b6 YH |
1321 | if (skb->len == sizeof(*mld)) { |
1322 | if (!pskb_may_pull(skb, sizeof(*mld))) { | |
1323 | err = -EINVAL; | |
1324 | goto out; | |
1325 | } | |
1326 | mld = (struct mld_msg *) icmp6_hdr(skb); | |
4715213d | 1327 | max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay)); |
08b202b6 YH |
1328 | if (max_delay) |
1329 | group = &mld->mld_mca; | |
248ba8ec | 1330 | } else { |
08b202b6 YH |
1331 | if (!pskb_may_pull(skb, sizeof(*mld2q))) { |
1332 | err = -EINVAL; | |
1333 | goto out; | |
1334 | } | |
1335 | mld2q = (struct mld2_query *)icmp6_hdr(skb); | |
1336 | if (!mld2q->mld2q_nsrcs) | |
1337 | group = &mld2q->mld2q_mca; | |
e3f5b170 DB |
1338 | |
1339 | max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL); | |
08b202b6 YH |
1340 | } |
1341 | ||
9ed973cc LL |
1342 | is_general_query = group && ipv6_addr_any(group); |
1343 | ||
dc4eb53a LL |
1344 | if (is_general_query) { |
1345 | saddr.proto = htons(ETH_P_IPV6); | |
1346 | saddr.u.ip6 = ip6h->saddr; | |
b00589af | 1347 | |
dc4eb53a LL |
1348 | br_multicast_query_received(br, port, &br->ip6_other_query, |
1349 | &saddr, max_delay); | |
08b202b6 | 1350 | goto out; |
6c03ee8b LL |
1351 | } else if (!group) { |
1352 | goto out; | |
dc4eb53a | 1353 | } |
08b202b6 | 1354 | |
b0e9a30d | 1355 | mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid); |
08b202b6 YH |
1356 | if (!mp) |
1357 | goto out; | |
1358 | ||
1359 | max_delay *= br->multicast_last_member_count; | |
8a870178 | 1360 | if (mp->mglist && |
08b202b6 YH |
1361 | (timer_pending(&mp->timer) ? |
1362 | time_after(mp->timer.expires, now + max_delay) : | |
1363 | try_to_del_timer_sync(&mp->timer) >= 0)) | |
1364 | mod_timer(&mp->timer, now + max_delay); | |
1365 | ||
e8051688 ED |
1366 | for (pp = &mp->ports; |
1367 | (p = mlock_dereference(*pp, br)) != NULL; | |
1368 | pp = &p->next) { | |
08b202b6 YH |
1369 | if (timer_pending(&p->timer) ? |
1370 | time_after(p->timer.expires, now + max_delay) : | |
1371 | try_to_del_timer_sync(&p->timer) >= 0) | |
24f9cdcb | 1372 | mod_timer(&p->timer, now + max_delay); |
08b202b6 YH |
1373 | } |
1374 | ||
1375 | out: | |
1376 | spin_unlock(&br->multicast_lock); | |
1377 | return err; | |
1378 | } | |
1379 | #endif | |
1380 | ||
90010b36 LL |
1381 | static void |
1382 | br_multicast_leave_group(struct net_bridge *br, | |
1383 | struct net_bridge_port *port, | |
1384 | struct br_ip *group, | |
1385 | struct bridge_mcast_other_query *other_query, | |
1386 | struct bridge_mcast_own_query *own_query) | |
eb1d1641 HX |
1387 | { |
1388 | struct net_bridge_mdb_htable *mdb; | |
1389 | struct net_bridge_mdb_entry *mp; | |
1390 | struct net_bridge_port_group *p; | |
1391 | unsigned long now; | |
1392 | unsigned long time; | |
1393 | ||
eb1d1641 HX |
1394 | spin_lock(&br->multicast_lock); |
1395 | if (!netif_running(br->dev) || | |
1396 | (port && port->state == BR_STATE_DISABLED) || | |
90010b36 | 1397 | timer_pending(&other_query->timer)) |
eb1d1641 HX |
1398 | goto out; |
1399 | ||
e8051688 | 1400 | mdb = mlock_dereference(br->mdb, br); |
eb1d1641 HX |
1401 | mp = br_mdb_ip_get(mdb, group); |
1402 | if (!mp) | |
1403 | goto out; | |
1404 | ||
cc0fdd80 | 1405 | if (br->multicast_querier) { |
6b7df111 CW |
1406 | __br_multicast_send_query(br, port, &mp->addr); |
1407 | ||
1408 | time = jiffies + br->multicast_last_member_count * | |
1409 | br->multicast_last_member_interval; | |
cc0fdd80 | 1410 | |
90010b36 | 1411 | mod_timer(&own_query->timer, time); |
6b7df111 CW |
1412 | |
1413 | for (p = mlock_dereference(mp->ports, br); | |
1414 | p != NULL; | |
1415 | p = mlock_dereference(p->next, br)) { | |
1416 | if (p->port != port) | |
1417 | continue; | |
1418 | ||
1419 | if (!hlist_unhashed(&p->mglist) && | |
1420 | (timer_pending(&p->timer) ? | |
1421 | time_after(p->timer.expires, time) : | |
1422 | try_to_del_timer_sync(&p->timer) >= 0)) { | |
1423 | mod_timer(&p->timer, time); | |
1424 | } | |
1425 | ||
1426 | break; | |
1427 | } | |
1428 | } | |
1429 | ||
c2d3babf | 1430 | if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) { |
50426b59 AW |
1431 | struct net_bridge_port_group __rcu **pp; |
1432 | ||
1433 | for (pp = &mp->ports; | |
1434 | (p = mlock_dereference(*pp, br)) != NULL; | |
1435 | pp = &p->next) { | |
1436 | if (p->port != port) | |
1437 | continue; | |
1438 | ||
1439 | rcu_assign_pointer(*pp, p->next); | |
1440 | hlist_del_init(&p->mglist); | |
1441 | del_timer(&p->timer); | |
1442 | call_rcu_bh(&p->rcu, br_multicast_free_pg); | |
37a393bc | 1443 | br_mdb_notify(br->dev, port, group, RTM_DELMDB); |
50426b59 | 1444 | |
454594f3 | 1445 | if (!mp->ports && !mp->mglist && |
50426b59 AW |
1446 | netif_running(br->dev)) |
1447 | mod_timer(&mp->timer, jiffies); | |
1448 | } | |
1449 | goto out; | |
1450 | } | |
1451 | ||
eb1d1641 HX |
1452 | now = jiffies; |
1453 | time = now + br->multicast_last_member_count * | |
1454 | br->multicast_last_member_interval; | |
1455 | ||
1456 | if (!port) { | |
454594f3 | 1457 | if (mp->mglist && |
eb1d1641 HX |
1458 | (timer_pending(&mp->timer) ? |
1459 | time_after(mp->timer.expires, time) : | |
1460 | try_to_del_timer_sync(&mp->timer) >= 0)) { | |
1461 | mod_timer(&mp->timer, time); | |
eb1d1641 | 1462 | } |
454594f3 LL |
1463 | |
1464 | goto out; | |
1465 | } | |
1466 | ||
1467 | for (p = mlock_dereference(mp->ports, br); | |
1468 | p != NULL; | |
1469 | p = mlock_dereference(p->next, br)) { | |
1470 | if (p->port != port) | |
1471 | continue; | |
1472 | ||
1473 | if (!hlist_unhashed(&p->mglist) && | |
1474 | (timer_pending(&p->timer) ? | |
1475 | time_after(p->timer.expires, time) : | |
1476 | try_to_del_timer_sync(&p->timer) >= 0)) { | |
1477 | mod_timer(&p->timer, time); | |
1478 | } | |
1479 | ||
1480 | break; | |
eb1d1641 | 1481 | } |
eb1d1641 HX |
1482 | out: |
1483 | spin_unlock(&br->multicast_lock); | |
1484 | } | |
1485 | ||
8ef2a9a5 YH |
1486 | static void br_ip4_multicast_leave_group(struct net_bridge *br, |
1487 | struct net_bridge_port *port, | |
b0e9a30d VY |
1488 | __be32 group, |
1489 | __u16 vid) | |
8ef2a9a5 YH |
1490 | { |
1491 | struct br_ip br_group; | |
90010b36 | 1492 | struct bridge_mcast_own_query *own_query; |
8ef2a9a5 YH |
1493 | |
1494 | if (ipv4_is_local_multicast(group)) | |
1495 | return; | |
1496 | ||
90010b36 LL |
1497 | own_query = port ? &port->ip4_own_query : &br->ip4_own_query; |
1498 | ||
8ef2a9a5 YH |
1499 | br_group.u.ip4 = group; |
1500 | br_group.proto = htons(ETH_P_IP); | |
b0e9a30d | 1501 | br_group.vid = vid; |
8ef2a9a5 | 1502 | |
90010b36 LL |
1503 | br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query, |
1504 | own_query); | |
8ef2a9a5 YH |
1505 | } |
1506 | ||
dfd56b8b | 1507 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1508 | static void br_ip6_multicast_leave_group(struct net_bridge *br, |
1509 | struct net_bridge_port *port, | |
b0e9a30d VY |
1510 | const struct in6_addr *group, |
1511 | __u16 vid) | |
08b202b6 YH |
1512 | { |
1513 | struct br_ip br_group; | |
90010b36 | 1514 | struct bridge_mcast_own_query *own_query; |
08b202b6 | 1515 | |
3c3769e6 | 1516 | if (ipv6_addr_is_ll_all_nodes(group)) |
08b202b6 YH |
1517 | return; |
1518 | ||
90010b36 LL |
1519 | own_query = port ? &port->ip6_own_query : &br->ip6_own_query; |
1520 | ||
4e3fd7a0 | 1521 | br_group.u.ip6 = *group; |
08b202b6 | 1522 | br_group.proto = htons(ETH_P_IPV6); |
b0e9a30d | 1523 | br_group.vid = vid; |
08b202b6 | 1524 | |
90010b36 LL |
1525 | br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query, |
1526 | own_query); | |
08b202b6 YH |
1527 | } |
1528 | #endif | |
8ef2a9a5 | 1529 | |
eb1d1641 HX |
1530 | static int br_multicast_ipv4_rcv(struct net_bridge *br, |
1531 | struct net_bridge_port *port, | |
06499098 VY |
1532 | struct sk_buff *skb, |
1533 | u16 vid) | |
eb1d1641 | 1534 | { |
9afd85c9 | 1535 | struct sk_buff *skb_trimmed = NULL; |
eb1d1641 | 1536 | struct igmphdr *ih; |
eb1d1641 HX |
1537 | int err; |
1538 | ||
9afd85c9 | 1539 | err = ip_mc_check_igmp(skb, &skb_trimmed); |
eb1d1641 | 1540 | |
9afd85c9 LL |
1541 | if (err == -ENOMSG) { |
1542 | if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) | |
bd4265fe | 1543 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
eb1d1641 | 1544 | return 0; |
9afd85c9 LL |
1545 | } else if (err < 0) { |
1546 | return err; | |
bd4265fe | 1547 | } |
eb1d1641 | 1548 | |
eb1d1641 | 1549 | BR_INPUT_SKB_CB(skb)->igmp = 1; |
9afd85c9 | 1550 | ih = igmp_hdr(skb); |
eb1d1641 HX |
1551 | |
1552 | switch (ih->type) { | |
1553 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1554 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
62b2bcb4 | 1555 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
b0e9a30d | 1556 | err = br_ip4_multicast_add_group(br, port, ih->group, vid); |
eb1d1641 HX |
1557 | break; |
1558 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
9afd85c9 | 1559 | err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid); |
eb1d1641 HX |
1560 | break; |
1561 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
9afd85c9 | 1562 | err = br_ip4_multicast_query(br, port, skb_trimmed, vid); |
eb1d1641 HX |
1563 | break; |
1564 | case IGMP_HOST_LEAVE_MESSAGE: | |
b0e9a30d | 1565 | br_ip4_multicast_leave_group(br, port, ih->group, vid); |
eb1d1641 HX |
1566 | break; |
1567 | } | |
1568 | ||
9afd85c9 LL |
1569 | if (skb_trimmed) |
1570 | kfree_skb(skb_trimmed); | |
1571 | ||
eb1d1641 HX |
1572 | return err; |
1573 | } | |
1574 | ||
dfd56b8b | 1575 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1576 | static int br_multicast_ipv6_rcv(struct net_bridge *br, |
1577 | struct net_bridge_port *port, | |
06499098 VY |
1578 | struct sk_buff *skb, |
1579 | u16 vid) | |
08b202b6 | 1580 | { |
9afd85c9 LL |
1581 | struct sk_buff *skb_trimmed = NULL; |
1582 | struct mld_msg *mld; | |
08b202b6 YH |
1583 | int err; |
1584 | ||
9afd85c9 | 1585 | err = ipv6_mc_check_mld(skb, &skb_trimmed); |
08b202b6 | 1586 | |
9afd85c9 LL |
1587 | if (err == -ENOMSG) { |
1588 | if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr)) | |
1589 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; | |
08b202b6 | 1590 | return 0; |
9afd85c9 LL |
1591 | } else if (err < 0) { |
1592 | return err; | |
08b202b6 YH |
1593 | } |
1594 | ||
08b202b6 | 1595 | BR_INPUT_SKB_CB(skb)->igmp = 1; |
9afd85c9 | 1596 | mld = (struct mld_msg *)skb_transport_header(skb); |
08b202b6 | 1597 | |
9afd85c9 | 1598 | switch (mld->mld_type) { |
08b202b6 | 1599 | case ICMPV6_MGM_REPORT: |
fc2af6c7 | 1600 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
b0e9a30d | 1601 | err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid); |
08b202b6 | 1602 | break; |
08b202b6 | 1603 | case ICMPV6_MLD2_REPORT: |
9afd85c9 | 1604 | err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid); |
08b202b6 YH |
1605 | break; |
1606 | case ICMPV6_MGM_QUERY: | |
9afd85c9 | 1607 | err = br_ip6_multicast_query(br, port, skb_trimmed, vid); |
08b202b6 YH |
1608 | break; |
1609 | case ICMPV6_MGM_REDUCTION: | |
b0e9a30d | 1610 | br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid); |
9afd85c9 | 1611 | break; |
08b202b6 YH |
1612 | } |
1613 | ||
9afd85c9 LL |
1614 | if (skb_trimmed) |
1615 | kfree_skb(skb_trimmed); | |
1616 | ||
08b202b6 YH |
1617 | return err; |
1618 | } | |
1619 | #endif | |
1620 | ||
eb1d1641 | 1621 | int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, |
06499098 | 1622 | struct sk_buff *skb, u16 vid) |
eb1d1641 | 1623 | { |
1fafc7a9 YH |
1624 | BR_INPUT_SKB_CB(skb)->igmp = 0; |
1625 | BR_INPUT_SKB_CB(skb)->mrouters_only = 0; | |
1626 | ||
eb1d1641 HX |
1627 | if (br->multicast_disabled) |
1628 | return 0; | |
1629 | ||
1630 | switch (skb->protocol) { | |
1631 | case htons(ETH_P_IP): | |
06499098 | 1632 | return br_multicast_ipv4_rcv(br, port, skb, vid); |
dfd56b8b | 1633 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 1634 | case htons(ETH_P_IPV6): |
06499098 | 1635 | return br_multicast_ipv6_rcv(br, port, skb, vid); |
08b202b6 | 1636 | #endif |
eb1d1641 HX |
1637 | } |
1638 | ||
1639 | return 0; | |
1640 | } | |
1641 | ||
cc0fdd80 | 1642 | static void br_multicast_query_expired(struct net_bridge *br, |
2cd41431 LL |
1643 | struct bridge_mcast_own_query *query, |
1644 | struct bridge_mcast_querier *querier) | |
cc0fdd80 LL |
1645 | { |
1646 | spin_lock(&br->multicast_lock); | |
1647 | if (query->startup_sent < br->multicast_startup_query_count) | |
1648 | query->startup_sent++; | |
1649 | ||
71d9f614 | 1650 | RCU_INIT_POINTER(querier->port, NULL); |
cc0fdd80 LL |
1651 | br_multicast_send_query(br, NULL, query); |
1652 | spin_unlock(&br->multicast_lock); | |
1653 | } | |
1654 | ||
1655 | static void br_ip4_multicast_query_expired(unsigned long data) | |
eb1d1641 HX |
1656 | { |
1657 | struct net_bridge *br = (void *)data; | |
1658 | ||
2cd41431 | 1659 | br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier); |
cc0fdd80 | 1660 | } |
eb1d1641 | 1661 | |
cc0fdd80 LL |
1662 | #if IS_ENABLED(CONFIG_IPV6) |
1663 | static void br_ip6_multicast_query_expired(unsigned long data) | |
1664 | { | |
1665 | struct net_bridge *br = (void *)data; | |
eb1d1641 | 1666 | |
2cd41431 | 1667 | br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier); |
eb1d1641 | 1668 | } |
cc0fdd80 | 1669 | #endif |
eb1d1641 HX |
1670 | |
1671 | void br_multicast_init(struct net_bridge *br) | |
1672 | { | |
1673 | br->hash_elasticity = 4; | |
1674 | br->hash_max = 512; | |
1675 | ||
1676 | br->multicast_router = 1; | |
c5c23260 | 1677 | br->multicast_querier = 0; |
1c8ad5bf | 1678 | br->multicast_query_use_ifaddr = 0; |
eb1d1641 HX |
1679 | br->multicast_last_member_count = 2; |
1680 | br->multicast_startup_query_count = 2; | |
1681 | ||
1682 | br->multicast_last_member_interval = HZ; | |
1683 | br->multicast_query_response_interval = 10 * HZ; | |
1684 | br->multicast_startup_query_interval = 125 * HZ / 4; | |
1685 | br->multicast_query_interval = 125 * HZ; | |
1686 | br->multicast_querier_interval = 255 * HZ; | |
1687 | br->multicast_membership_interval = 260 * HZ; | |
1688 | ||
90010b36 | 1689 | br->ip4_other_query.delay_time = 0; |
2cd41431 | 1690 | br->ip4_querier.port = NULL; |
cc0fdd80 | 1691 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 | 1692 | br->ip6_other_query.delay_time = 0; |
2cd41431 | 1693 | br->ip6_querier.port = NULL; |
cc0fdd80 | 1694 | #endif |
b00589af | 1695 | |
eb1d1641 HX |
1696 | spin_lock_init(&br->multicast_lock); |
1697 | setup_timer(&br->multicast_router_timer, | |
1698 | br_multicast_local_router_expired, 0); | |
90010b36 LL |
1699 | setup_timer(&br->ip4_other_query.timer, |
1700 | br_ip4_multicast_querier_expired, (unsigned long)br); | |
1701 | setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired, | |
eb1d1641 | 1702 | (unsigned long)br); |
cc0fdd80 | 1703 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 LL |
1704 | setup_timer(&br->ip6_other_query.timer, |
1705 | br_ip6_multicast_querier_expired, (unsigned long)br); | |
1706 | setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired, | |
cc0fdd80 LL |
1707 | (unsigned long)br); |
1708 | #endif | |
eb1d1641 HX |
1709 | } |
1710 | ||
cc0fdd80 | 1711 | static void __br_multicast_open(struct net_bridge *br, |
90010b36 | 1712 | struct bridge_mcast_own_query *query) |
eb1d1641 | 1713 | { |
cc0fdd80 | 1714 | query->startup_sent = 0; |
eb1d1641 HX |
1715 | |
1716 | if (br->multicast_disabled) | |
1717 | return; | |
1718 | ||
cc0fdd80 LL |
1719 | mod_timer(&query->timer, jiffies); |
1720 | } | |
1721 | ||
1722 | void br_multicast_open(struct net_bridge *br) | |
1723 | { | |
90010b36 | 1724 | __br_multicast_open(br, &br->ip4_own_query); |
cc0fdd80 | 1725 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 | 1726 | __br_multicast_open(br, &br->ip6_own_query); |
cc0fdd80 | 1727 | #endif |
eb1d1641 HX |
1728 | } |
1729 | ||
1730 | void br_multicast_stop(struct net_bridge *br) | |
1731 | { | |
1732 | struct net_bridge_mdb_htable *mdb; | |
1733 | struct net_bridge_mdb_entry *mp; | |
b67bfe0d | 1734 | struct hlist_node *n; |
eb1d1641 HX |
1735 | u32 ver; |
1736 | int i; | |
1737 | ||
1738 | del_timer_sync(&br->multicast_router_timer); | |
90010b36 LL |
1739 | del_timer_sync(&br->ip4_other_query.timer); |
1740 | del_timer_sync(&br->ip4_own_query.timer); | |
cc0fdd80 | 1741 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 LL |
1742 | del_timer_sync(&br->ip6_other_query.timer); |
1743 | del_timer_sync(&br->ip6_own_query.timer); | |
cc0fdd80 | 1744 | #endif |
eb1d1641 HX |
1745 | |
1746 | spin_lock_bh(&br->multicast_lock); | |
e8051688 | 1747 | mdb = mlock_dereference(br->mdb, br); |
eb1d1641 HX |
1748 | if (!mdb) |
1749 | goto out; | |
1750 | ||
1751 | br->mdb = NULL; | |
1752 | ||
1753 | ver = mdb->ver; | |
1754 | for (i = 0; i < mdb->max; i++) { | |
b67bfe0d | 1755 | hlist_for_each_entry_safe(mp, n, &mdb->mhash[i], |
eb1d1641 HX |
1756 | hlist[ver]) { |
1757 | del_timer(&mp->timer); | |
eb1d1641 HX |
1758 | call_rcu_bh(&mp->rcu, br_multicast_free_group); |
1759 | } | |
1760 | } | |
1761 | ||
1762 | if (mdb->old) { | |
1763 | spin_unlock_bh(&br->multicast_lock); | |
10cc2b50 | 1764 | rcu_barrier_bh(); |
eb1d1641 HX |
1765 | spin_lock_bh(&br->multicast_lock); |
1766 | WARN_ON(mdb->old); | |
1767 | } | |
1768 | ||
1769 | mdb->old = mdb; | |
1770 | call_rcu_bh(&mdb->rcu, br_mdb_free); | |
1771 | ||
1772 | out: | |
1773 | spin_unlock_bh(&br->multicast_lock); | |
1774 | } | |
0909e117 HX |
1775 | |
1776 | int br_multicast_set_router(struct net_bridge *br, unsigned long val) | |
1777 | { | |
6ae4ae8e | 1778 | int err = -EINVAL; |
0909e117 HX |
1779 | |
1780 | spin_lock_bh(&br->multicast_lock); | |
0909e117 HX |
1781 | |
1782 | switch (val) { | |
1783 | case 0: | |
1784 | case 2: | |
1785 | del_timer(&br->multicast_router_timer); | |
1786 | /* fall through */ | |
1787 | case 1: | |
1788 | br->multicast_router = val; | |
1789 | err = 0; | |
1790 | break; | |
0909e117 HX |
1791 | } |
1792 | ||
0909e117 HX |
1793 | spin_unlock_bh(&br->multicast_lock); |
1794 | ||
1795 | return err; | |
1796 | } | |
1797 | ||
1798 | int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) | |
1799 | { | |
1800 | struct net_bridge *br = p->br; | |
6ae4ae8e | 1801 | int err = -EINVAL; |
0909e117 HX |
1802 | |
1803 | spin_lock(&br->multicast_lock); | |
0909e117 HX |
1804 | |
1805 | switch (val) { | |
1806 | case 0: | |
1807 | case 1: | |
1808 | case 2: | |
1809 | p->multicast_router = val; | |
1810 | err = 0; | |
1811 | ||
1812 | if (val < 2 && !hlist_unhashed(&p->rlist)) | |
1813 | hlist_del_init_rcu(&p->rlist); | |
1814 | ||
1815 | if (val == 1) | |
1816 | break; | |
1817 | ||
1818 | del_timer(&p->multicast_router_timer); | |
1819 | ||
1820 | if (val == 0) | |
1821 | break; | |
1822 | ||
1823 | br_multicast_add_router(br, p); | |
1824 | break; | |
0909e117 HX |
1825 | } |
1826 | ||
0909e117 HX |
1827 | spin_unlock(&br->multicast_lock); |
1828 | ||
1829 | return err; | |
1830 | } | |
561f1103 | 1831 | |
cc0fdd80 | 1832 | static void br_multicast_start_querier(struct net_bridge *br, |
90010b36 | 1833 | struct bridge_mcast_own_query *query) |
561f1103 HX |
1834 | { |
1835 | struct net_bridge_port *port; | |
74857216 | 1836 | |
cc0fdd80 | 1837 | __br_multicast_open(br, query); |
74857216 HX |
1838 | |
1839 | list_for_each_entry(port, &br->port_list, list) { | |
1840 | if (port->state == BR_STATE_DISABLED || | |
1841 | port->state == BR_STATE_BLOCKING) | |
1842 | continue; | |
1843 | ||
90010b36 LL |
1844 | if (query == &br->ip4_own_query) |
1845 | br_multicast_enable(&port->ip4_own_query); | |
cc0fdd80 LL |
1846 | #if IS_ENABLED(CONFIG_IPV6) |
1847 | else | |
90010b36 | 1848 | br_multicast_enable(&port->ip6_own_query); |
cc0fdd80 | 1849 | #endif |
74857216 HX |
1850 | } |
1851 | } | |
1852 | ||
1853 | int br_multicast_toggle(struct net_bridge *br, unsigned long val) | |
1854 | { | |
3a7fda06 | 1855 | int err = 0; |
e8051688 | 1856 | struct net_bridge_mdb_htable *mdb; |
561f1103 | 1857 | |
ef5e0d82 | 1858 | spin_lock_bh(&br->multicast_lock); |
561f1103 HX |
1859 | if (br->multicast_disabled == !val) |
1860 | goto unlock; | |
1861 | ||
1862 | br->multicast_disabled = !val; | |
1863 | if (br->multicast_disabled) | |
1864 | goto unlock; | |
1865 | ||
3a7fda06 HX |
1866 | if (!netif_running(br->dev)) |
1867 | goto unlock; | |
1868 | ||
e8051688 ED |
1869 | mdb = mlock_dereference(br->mdb, br); |
1870 | if (mdb) { | |
1871 | if (mdb->old) { | |
561f1103 HX |
1872 | err = -EEXIST; |
1873 | rollback: | |
1874 | br->multicast_disabled = !!val; | |
1875 | goto unlock; | |
1876 | } | |
1877 | ||
e8051688 | 1878 | err = br_mdb_rehash(&br->mdb, mdb->max, |
561f1103 HX |
1879 | br->hash_elasticity); |
1880 | if (err) | |
1881 | goto rollback; | |
1882 | } | |
1883 | ||
90010b36 | 1884 | br_multicast_start_querier(br, &br->ip4_own_query); |
cc0fdd80 | 1885 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 | 1886 | br_multicast_start_querier(br, &br->ip6_own_query); |
cc0fdd80 | 1887 | #endif |
561f1103 HX |
1888 | |
1889 | unlock: | |
ef5e0d82 | 1890 | spin_unlock_bh(&br->multicast_lock); |
561f1103 HX |
1891 | |
1892 | return err; | |
1893 | } | |
b195167f | 1894 | |
c5c23260 HX |
1895 | int br_multicast_set_querier(struct net_bridge *br, unsigned long val) |
1896 | { | |
b00589af LL |
1897 | unsigned long max_delay; |
1898 | ||
c5c23260 HX |
1899 | val = !!val; |
1900 | ||
1901 | spin_lock_bh(&br->multicast_lock); | |
1902 | if (br->multicast_querier == val) | |
1903 | goto unlock; | |
1904 | ||
1905 | br->multicast_querier = val; | |
b00589af LL |
1906 | if (!val) |
1907 | goto unlock; | |
1908 | ||
1909 | max_delay = br->multicast_query_response_interval; | |
b00589af | 1910 | |
90010b36 LL |
1911 | if (!timer_pending(&br->ip4_other_query.timer)) |
1912 | br->ip4_other_query.delay_time = jiffies + max_delay; | |
cc0fdd80 | 1913 | |
90010b36 | 1914 | br_multicast_start_querier(br, &br->ip4_own_query); |
cc0fdd80 LL |
1915 | |
1916 | #if IS_ENABLED(CONFIG_IPV6) | |
90010b36 LL |
1917 | if (!timer_pending(&br->ip6_other_query.timer)) |
1918 | br->ip6_other_query.delay_time = jiffies + max_delay; | |
cc0fdd80 | 1919 | |
90010b36 | 1920 | br_multicast_start_querier(br, &br->ip6_own_query); |
cc0fdd80 | 1921 | #endif |
c5c23260 HX |
1922 | |
1923 | unlock: | |
1924 | spin_unlock_bh(&br->multicast_lock); | |
1925 | ||
1926 | return 0; | |
1927 | } | |
1928 | ||
b195167f HX |
1929 | int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) |
1930 | { | |
6ae4ae8e | 1931 | int err = -EINVAL; |
b195167f | 1932 | u32 old; |
e8051688 | 1933 | struct net_bridge_mdb_htable *mdb; |
b195167f | 1934 | |
fe0d692b | 1935 | spin_lock_bh(&br->multicast_lock); |
b195167f HX |
1936 | if (!is_power_of_2(val)) |
1937 | goto unlock; | |
e8051688 ED |
1938 | |
1939 | mdb = mlock_dereference(br->mdb, br); | |
1940 | if (mdb && val < mdb->size) | |
b195167f HX |
1941 | goto unlock; |
1942 | ||
1943 | err = 0; | |
1944 | ||
1945 | old = br->hash_max; | |
1946 | br->hash_max = val; | |
1947 | ||
e8051688 ED |
1948 | if (mdb) { |
1949 | if (mdb->old) { | |
b195167f HX |
1950 | err = -EEXIST; |
1951 | rollback: | |
1952 | br->hash_max = old; | |
1953 | goto unlock; | |
1954 | } | |
1955 | ||
1956 | err = br_mdb_rehash(&br->mdb, br->hash_max, | |
1957 | br->hash_elasticity); | |
1958 | if (err) | |
1959 | goto rollback; | |
1960 | } | |
1961 | ||
1962 | unlock: | |
fe0d692b | 1963 | spin_unlock_bh(&br->multicast_lock); |
b195167f HX |
1964 | |
1965 | return err; | |
1966 | } | |
07f8ac4a LL |
1967 | |
1968 | /** | |
1969 | * br_multicast_list_adjacent - Returns snooped multicast addresses | |
1970 | * @dev: The bridge port adjacent to which to retrieve addresses | |
1971 | * @br_ip_list: The list to store found, snooped multicast IP addresses in | |
1972 | * | |
1973 | * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast | |
1974 | * snooping feature on all bridge ports of dev's bridge device, excluding | |
1975 | * the addresses from dev itself. | |
1976 | * | |
1977 | * Returns the number of items added to br_ip_list. | |
1978 | * | |
1979 | * Notes: | |
1980 | * - br_ip_list needs to be initialized by caller | |
1981 | * - br_ip_list might contain duplicates in the end | |
1982 | * (needs to be taken care of by caller) | |
1983 | * - br_ip_list needs to be freed by caller | |
1984 | */ | |
1985 | int br_multicast_list_adjacent(struct net_device *dev, | |
1986 | struct list_head *br_ip_list) | |
1987 | { | |
1988 | struct net_bridge *br; | |
1989 | struct net_bridge_port *port; | |
1990 | struct net_bridge_port_group *group; | |
1991 | struct br_ip_list *entry; | |
1992 | int count = 0; | |
1993 | ||
1994 | rcu_read_lock(); | |
1995 | if (!br_ip_list || !br_port_exists(dev)) | |
1996 | goto unlock; | |
1997 | ||
1998 | port = br_port_get_rcu(dev); | |
1999 | if (!port || !port->br) | |
2000 | goto unlock; | |
2001 | ||
2002 | br = port->br; | |
2003 | ||
2004 | list_for_each_entry_rcu(port, &br->port_list, list) { | |
2005 | if (!port->dev || port->dev == dev) | |
2006 | continue; | |
2007 | ||
2008 | hlist_for_each_entry_rcu(group, &port->mglist, mglist) { | |
2009 | entry = kmalloc(sizeof(*entry), GFP_ATOMIC); | |
2010 | if (!entry) | |
2011 | goto unlock; | |
2012 | ||
2013 | entry->addr = group->addr; | |
2014 | list_add(&entry->list, br_ip_list); | |
2015 | count++; | |
2016 | } | |
2017 | } | |
2018 | ||
2019 | unlock: | |
2020 | rcu_read_unlock(); | |
2021 | return count; | |
2022 | } | |
2023 | EXPORT_SYMBOL_GPL(br_multicast_list_adjacent); | |
2cd41431 | 2024 | |
c34963e2 LL |
2025 | /** |
2026 | * br_multicast_has_querier_anywhere - Checks for a querier on a bridge | |
2027 | * @dev: The bridge port providing the bridge on which to check for a querier | |
2028 | * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 | |
2029 | * | |
2030 | * Checks whether the given interface has a bridge on top and if so returns | |
2031 | * true if a valid querier exists anywhere on the bridged link layer. | |
2032 | * Otherwise returns false. | |
2033 | */ | |
2034 | bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto) | |
2035 | { | |
2036 | struct net_bridge *br; | |
2037 | struct net_bridge_port *port; | |
2038 | struct ethhdr eth; | |
2039 | bool ret = false; | |
2040 | ||
2041 | rcu_read_lock(); | |
2042 | if (!br_port_exists(dev)) | |
2043 | goto unlock; | |
2044 | ||
2045 | port = br_port_get_rcu(dev); | |
2046 | if (!port || !port->br) | |
2047 | goto unlock; | |
2048 | ||
2049 | br = port->br; | |
2050 | ||
2051 | memset(ð, 0, sizeof(eth)); | |
2052 | eth.h_proto = htons(proto); | |
2053 | ||
2054 | ret = br_multicast_querier_exists(br, ð); | |
2055 | ||
2056 | unlock: | |
2057 | rcu_read_unlock(); | |
2058 | return ret; | |
2059 | } | |
2060 | EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere); | |
2061 | ||
2cd41431 LL |
2062 | /** |
2063 | * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port | |
2064 | * @dev: The bridge port adjacent to which to check for a querier | |
2065 | * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 | |
2066 | * | |
2067 | * Checks whether the given interface has a bridge on top and if so returns | |
2068 | * true if a selected querier is behind one of the other ports of this | |
2069 | * bridge. Otherwise returns false. | |
2070 | */ | |
2071 | bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto) | |
2072 | { | |
2073 | struct net_bridge *br; | |
2074 | struct net_bridge_port *port; | |
2075 | bool ret = false; | |
2076 | ||
2077 | rcu_read_lock(); | |
2078 | if (!br_port_exists(dev)) | |
2079 | goto unlock; | |
2080 | ||
2081 | port = br_port_get_rcu(dev); | |
2082 | if (!port || !port->br) | |
2083 | goto unlock; | |
2084 | ||
2085 | br = port->br; | |
2086 | ||
2087 | switch (proto) { | |
2088 | case ETH_P_IP: | |
2089 | if (!timer_pending(&br->ip4_other_query.timer) || | |
2090 | rcu_dereference(br->ip4_querier.port) == port) | |
2091 | goto unlock; | |
2092 | break; | |
3993c4e1 | 2093 | #if IS_ENABLED(CONFIG_IPV6) |
2cd41431 LL |
2094 | case ETH_P_IPV6: |
2095 | if (!timer_pending(&br->ip6_other_query.timer) || | |
2096 | rcu_dereference(br->ip6_querier.port) == port) | |
2097 | goto unlock; | |
2098 | break; | |
3993c4e1 | 2099 | #endif |
2cd41431 LL |
2100 | default: |
2101 | goto unlock; | |
2102 | } | |
2103 | ||
2104 | ret = true; | |
2105 | unlock: | |
2106 | rcu_read_unlock(); | |
2107 | return ret; | |
2108 | } | |
2109 | EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent); |