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Commit | Line | Data |
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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); |
2ce297fc | 40 | unsigned int br_mdb_rehash_seq; |
c83b8fab | 41 | |
8ef2a9a5 YH |
42 | static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b) |
43 | { | |
44 | if (a->proto != b->proto) | |
45 | return 0; | |
b0e9a30d VY |
46 | if (a->vid != b->vid) |
47 | return 0; | |
8ef2a9a5 YH |
48 | switch (a->proto) { |
49 | case htons(ETH_P_IP): | |
50 | return a->u.ip4 == b->u.ip4; | |
dfd56b8b | 51 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
52 | case htons(ETH_P_IPV6): |
53 | return ipv6_addr_equal(&a->u.ip6, &b->u.ip6); | |
54 | #endif | |
8ef2a9a5 YH |
55 | } |
56 | return 0; | |
57 | } | |
58 | ||
b0e9a30d VY |
59 | static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip, |
60 | __u16 vid) | |
eb1d1641 | 61 | { |
b0e9a30d | 62 | return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1); |
eb1d1641 HX |
63 | } |
64 | ||
dfd56b8b | 65 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 66 | static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb, |
b0e9a30d VY |
67 | const struct in6_addr *ip, |
68 | __u16 vid) | |
08b202b6 | 69 | { |
b0e9a30d VY |
70 | return jhash_2words(ipv6_addr_hash(ip), vid, |
71 | mdb->secret) & (mdb->max - 1); | |
08b202b6 YH |
72 | } |
73 | #endif | |
74 | ||
8ef2a9a5 YH |
75 | static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb, |
76 | struct br_ip *ip) | |
77 | { | |
78 | switch (ip->proto) { | |
79 | case htons(ETH_P_IP): | |
b0e9a30d | 80 | return __br_ip4_hash(mdb, ip->u.ip4, ip->vid); |
dfd56b8b | 81 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 82 | case htons(ETH_P_IPV6): |
b0e9a30d | 83 | return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid); |
08b202b6 | 84 | #endif |
8ef2a9a5 YH |
85 | } |
86 | return 0; | |
eb1d1641 HX |
87 | } |
88 | ||
89 | static struct net_bridge_mdb_entry *__br_mdb_ip_get( | |
8ef2a9a5 | 90 | struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash) |
eb1d1641 HX |
91 | { |
92 | struct net_bridge_mdb_entry *mp; | |
eb1d1641 | 93 | |
b67bfe0d | 94 | hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) { |
8ef2a9a5 | 95 | if (br_ip_equal(&mp->addr, dst)) |
eb1d1641 HX |
96 | return mp; |
97 | } | |
98 | ||
99 | return NULL; | |
100 | } | |
101 | ||
cfd56754 CW |
102 | struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, |
103 | struct br_ip *dst) | |
7f285fa7 HX |
104 | { |
105 | if (!mdb) | |
106 | return NULL; | |
107 | ||
108 | return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst)); | |
109 | } | |
110 | ||
8ef2a9a5 | 111 | static struct net_bridge_mdb_entry *br_mdb_ip4_get( |
b0e9a30d | 112 | struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid) |
eb1d1641 | 113 | { |
8ef2a9a5 YH |
114 | struct br_ip br_dst; |
115 | ||
116 | br_dst.u.ip4 = dst; | |
117 | br_dst.proto = htons(ETH_P_IP); | |
b0e9a30d | 118 | br_dst.vid = vid; |
0821ec55 | 119 | |
7f285fa7 | 120 | return br_mdb_ip_get(mdb, &br_dst); |
8ef2a9a5 YH |
121 | } |
122 | ||
dfd56b8b | 123 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 124 | static struct net_bridge_mdb_entry *br_mdb_ip6_get( |
b0e9a30d VY |
125 | struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst, |
126 | __u16 vid) | |
08b202b6 YH |
127 | { |
128 | struct br_ip br_dst; | |
0821ec55 | 129 | |
4e3fd7a0 | 130 | br_dst.u.ip6 = *dst; |
08b202b6 | 131 | br_dst.proto = htons(ETH_P_IPV6); |
b0e9a30d | 132 | br_dst.vid = vid; |
08b202b6 | 133 | |
7f285fa7 | 134 | return br_mdb_ip_get(mdb, &br_dst); |
08b202b6 YH |
135 | } |
136 | #endif | |
137 | ||
eb1d1641 | 138 | struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, |
fbca58a2 | 139 | struct sk_buff *skb, u16 vid) |
eb1d1641 | 140 | { |
e8051688 | 141 | struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb); |
8ef2a9a5 YH |
142 | struct br_ip ip; |
143 | ||
7f285fa7 | 144 | if (br->multicast_disabled) |
eb1d1641 HX |
145 | return NULL; |
146 | ||
8ef2a9a5 | 147 | if (BR_INPUT_SKB_CB(skb)->igmp) |
eb1d1641 HX |
148 | return NULL; |
149 | ||
8ef2a9a5 | 150 | ip.proto = skb->protocol; |
fbca58a2 | 151 | ip.vid = vid; |
8ef2a9a5 | 152 | |
eb1d1641 HX |
153 | switch (skb->protocol) { |
154 | case htons(ETH_P_IP): | |
8ef2a9a5 YH |
155 | ip.u.ip4 = ip_hdr(skb)->daddr; |
156 | break; | |
dfd56b8b | 157 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 158 | case htons(ETH_P_IPV6): |
4e3fd7a0 | 159 | ip.u.ip6 = ipv6_hdr(skb)->daddr; |
08b202b6 YH |
160 | break; |
161 | #endif | |
8ef2a9a5 YH |
162 | default: |
163 | return NULL; | |
eb1d1641 HX |
164 | } |
165 | ||
8ef2a9a5 | 166 | return br_mdb_ip_get(mdb, &ip); |
eb1d1641 HX |
167 | } |
168 | ||
169 | static void br_mdb_free(struct rcu_head *head) | |
170 | { | |
171 | struct net_bridge_mdb_htable *mdb = | |
172 | container_of(head, struct net_bridge_mdb_htable, rcu); | |
173 | struct net_bridge_mdb_htable *old = mdb->old; | |
174 | ||
175 | mdb->old = NULL; | |
176 | kfree(old->mhash); | |
177 | kfree(old); | |
178 | } | |
179 | ||
180 | static int br_mdb_copy(struct net_bridge_mdb_htable *new, | |
181 | struct net_bridge_mdb_htable *old, | |
182 | int elasticity) | |
183 | { | |
184 | struct net_bridge_mdb_entry *mp; | |
eb1d1641 HX |
185 | int maxlen; |
186 | int len; | |
187 | int i; | |
188 | ||
189 | for (i = 0; i < old->max; i++) | |
b67bfe0d | 190 | hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver]) |
eb1d1641 | 191 | hlist_add_head(&mp->hlist[new->ver], |
8ef2a9a5 | 192 | &new->mhash[br_ip_hash(new, &mp->addr)]); |
eb1d1641 HX |
193 | |
194 | if (!elasticity) | |
195 | return 0; | |
196 | ||
197 | maxlen = 0; | |
198 | for (i = 0; i < new->max; i++) { | |
199 | len = 0; | |
b67bfe0d | 200 | hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver]) |
eb1d1641 HX |
201 | len++; |
202 | if (len > maxlen) | |
203 | maxlen = len; | |
204 | } | |
205 | ||
206 | return maxlen > elasticity ? -EINVAL : 0; | |
207 | } | |
208 | ||
cfd56754 | 209 | void br_multicast_free_pg(struct rcu_head *head) |
eb1d1641 HX |
210 | { |
211 | struct net_bridge_port_group *p = | |
212 | container_of(head, struct net_bridge_port_group, rcu); | |
213 | ||
214 | kfree(p); | |
215 | } | |
216 | ||
217 | static void br_multicast_free_group(struct rcu_head *head) | |
218 | { | |
219 | struct net_bridge_mdb_entry *mp = | |
220 | container_of(head, struct net_bridge_mdb_entry, rcu); | |
221 | ||
222 | kfree(mp); | |
223 | } | |
224 | ||
225 | static void br_multicast_group_expired(unsigned long data) | |
226 | { | |
227 | struct net_bridge_mdb_entry *mp = (void *)data; | |
228 | struct net_bridge *br = mp->br; | |
229 | struct net_bridge_mdb_htable *mdb; | |
230 | ||
231 | spin_lock(&br->multicast_lock); | |
232 | if (!netif_running(br->dev) || timer_pending(&mp->timer)) | |
233 | goto out; | |
234 | ||
8a870178 | 235 | mp->mglist = false; |
eb1d1641 HX |
236 | |
237 | if (mp->ports) | |
238 | goto out; | |
239 | ||
e8051688 ED |
240 | mdb = mlock_dereference(br->mdb, br); |
241 | ||
eb1d1641 HX |
242 | hlist_del_rcu(&mp->hlist[mdb->ver]); |
243 | mdb->size--; | |
244 | ||
eb1d1641 HX |
245 | call_rcu_bh(&mp->rcu, br_multicast_free_group); |
246 | ||
247 | out: | |
248 | spin_unlock(&br->multicast_lock); | |
249 | } | |
250 | ||
251 | static void br_multicast_del_pg(struct net_bridge *br, | |
252 | struct net_bridge_port_group *pg) | |
253 | { | |
e8051688 | 254 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 HX |
255 | struct net_bridge_mdb_entry *mp; |
256 | struct net_bridge_port_group *p; | |
e8051688 ED |
257 | struct net_bridge_port_group __rcu **pp; |
258 | ||
259 | mdb = mlock_dereference(br->mdb, br); | |
eb1d1641 | 260 | |
8ef2a9a5 | 261 | mp = br_mdb_ip_get(mdb, &pg->addr); |
eb1d1641 HX |
262 | if (WARN_ON(!mp)) |
263 | return; | |
264 | ||
e8051688 ED |
265 | for (pp = &mp->ports; |
266 | (p = mlock_dereference(*pp, br)) != NULL; | |
267 | pp = &p->next) { | |
eb1d1641 HX |
268 | if (p != pg) |
269 | continue; | |
270 | ||
83f6a740 | 271 | rcu_assign_pointer(*pp, p->next); |
eb1d1641 HX |
272 | hlist_del_init(&p->mglist); |
273 | del_timer(&p->timer); | |
eb1d1641 HX |
274 | call_rcu_bh(&p->rcu, br_multicast_free_pg); |
275 | ||
454594f3 | 276 | if (!mp->ports && !mp->mglist && |
eb1d1641 HX |
277 | netif_running(br->dev)) |
278 | mod_timer(&mp->timer, jiffies); | |
279 | ||
280 | return; | |
281 | } | |
282 | ||
283 | WARN_ON(1); | |
284 | } | |
285 | ||
286 | static void br_multicast_port_group_expired(unsigned long data) | |
287 | { | |
288 | struct net_bridge_port_group *pg = (void *)data; | |
289 | struct net_bridge *br = pg->port->br; | |
290 | ||
291 | spin_lock(&br->multicast_lock); | |
292 | if (!netif_running(br->dev) || timer_pending(&pg->timer) || | |
ccb1c31a | 293 | hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT) |
eb1d1641 HX |
294 | goto out; |
295 | ||
296 | br_multicast_del_pg(br, pg); | |
297 | ||
298 | out: | |
299 | spin_unlock(&br->multicast_lock); | |
300 | } | |
301 | ||
e8051688 | 302 | static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max, |
eb1d1641 HX |
303 | int elasticity) |
304 | { | |
e8051688 | 305 | struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1); |
eb1d1641 HX |
306 | struct net_bridge_mdb_htable *mdb; |
307 | int err; | |
308 | ||
309 | mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC); | |
310 | if (!mdb) | |
311 | return -ENOMEM; | |
312 | ||
313 | mdb->max = max; | |
314 | mdb->old = old; | |
315 | ||
316 | mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC); | |
317 | if (!mdb->mhash) { | |
318 | kfree(mdb); | |
319 | return -ENOMEM; | |
320 | } | |
321 | ||
322 | mdb->size = old ? old->size : 0; | |
323 | mdb->ver = old ? old->ver ^ 1 : 0; | |
324 | ||
325 | if (!old || elasticity) | |
326 | get_random_bytes(&mdb->secret, sizeof(mdb->secret)); | |
327 | else | |
328 | mdb->secret = old->secret; | |
329 | ||
330 | if (!old) | |
331 | goto out; | |
332 | ||
333 | err = br_mdb_copy(mdb, old, elasticity); | |
334 | if (err) { | |
335 | kfree(mdb->mhash); | |
336 | kfree(mdb); | |
337 | return err; | |
338 | } | |
339 | ||
2ce297fc | 340 | br_mdb_rehash_seq++; |
eb1d1641 HX |
341 | call_rcu_bh(&mdb->rcu, br_mdb_free); |
342 | ||
343 | out: | |
344 | rcu_assign_pointer(*mdbp, mdb); | |
345 | ||
346 | return 0; | |
347 | } | |
348 | ||
8ef2a9a5 YH |
349 | static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br, |
350 | __be32 group) | |
eb1d1641 HX |
351 | { |
352 | struct sk_buff *skb; | |
353 | struct igmphdr *ih; | |
354 | struct ethhdr *eth; | |
355 | struct iphdr *iph; | |
356 | ||
357 | skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) + | |
358 | sizeof(*ih) + 4); | |
359 | if (!skb) | |
360 | goto out; | |
361 | ||
362 | skb->protocol = htons(ETH_P_IP); | |
363 | ||
364 | skb_reset_mac_header(skb); | |
365 | eth = eth_hdr(skb); | |
366 | ||
e5a727f6 | 367 | ether_addr_copy(eth->h_source, br->dev->dev_addr); |
eb1d1641 HX |
368 | eth->h_dest[0] = 1; |
369 | eth->h_dest[1] = 0; | |
370 | eth->h_dest[2] = 0x5e; | |
371 | eth->h_dest[3] = 0; | |
372 | eth->h_dest[4] = 0; | |
373 | eth->h_dest[5] = 1; | |
374 | eth->h_proto = htons(ETH_P_IP); | |
375 | skb_put(skb, sizeof(*eth)); | |
376 | ||
377 | skb_set_network_header(skb, skb->len); | |
378 | iph = ip_hdr(skb); | |
379 | ||
380 | iph->version = 4; | |
381 | iph->ihl = 6; | |
382 | iph->tos = 0xc0; | |
383 | iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4); | |
384 | iph->id = 0; | |
385 | iph->frag_off = htons(IP_DF); | |
386 | iph->ttl = 1; | |
387 | iph->protocol = IPPROTO_IGMP; | |
1c8ad5bf CW |
388 | iph->saddr = br->multicast_query_use_ifaddr ? |
389 | inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0; | |
eb1d1641 HX |
390 | iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); |
391 | ((u8 *)&iph[1])[0] = IPOPT_RA; | |
392 | ((u8 *)&iph[1])[1] = 4; | |
393 | ((u8 *)&iph[1])[2] = 0; | |
394 | ((u8 *)&iph[1])[3] = 0; | |
395 | ip_send_check(iph); | |
396 | skb_put(skb, 24); | |
397 | ||
398 | skb_set_transport_header(skb, skb->len); | |
399 | ih = igmp_hdr(skb); | |
400 | ih->type = IGMP_HOST_MEMBERSHIP_QUERY; | |
401 | ih->code = (group ? br->multicast_last_member_interval : | |
402 | br->multicast_query_response_interval) / | |
403 | (HZ / IGMP_TIMER_SCALE); | |
404 | ih->group = group; | |
405 | ih->csum = 0; | |
406 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
407 | skb_put(skb, sizeof(*ih)); | |
408 | ||
409 | __skb_pull(skb, sizeof(*eth)); | |
410 | ||
411 | out: | |
412 | return skb; | |
413 | } | |
414 | ||
dfd56b8b | 415 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 416 | static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, |
b71d1d42 | 417 | const struct in6_addr *group) |
08b202b6 YH |
418 | { |
419 | struct sk_buff *skb; | |
420 | struct ipv6hdr *ip6h; | |
421 | struct mld_msg *mldq; | |
422 | struct ethhdr *eth; | |
423 | u8 *hopopt; | |
424 | unsigned long interval; | |
425 | ||
426 | skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) + | |
427 | 8 + sizeof(*mldq)); | |
428 | if (!skb) | |
429 | goto out; | |
430 | ||
431 | skb->protocol = htons(ETH_P_IPV6); | |
432 | ||
433 | /* Ethernet header */ | |
434 | skb_reset_mac_header(skb); | |
435 | eth = eth_hdr(skb); | |
436 | ||
e5a727f6 | 437 | ether_addr_copy(eth->h_source, br->dev->dev_addr); |
08b202b6 YH |
438 | eth->h_proto = htons(ETH_P_IPV6); |
439 | skb_put(skb, sizeof(*eth)); | |
440 | ||
441 | /* IPv6 header + HbH option */ | |
442 | skb_set_network_header(skb, skb->len); | |
443 | ip6h = ipv6_hdr(skb); | |
444 | ||
445 | *(__force __be32 *)ip6h = htonl(0x60000000); | |
76d66158 | 446 | ip6h->payload_len = htons(8 + sizeof(*mldq)); |
08b202b6 YH |
447 | ip6h->nexthdr = IPPROTO_HOPOPTS; |
448 | ip6h->hop_limit = 1; | |
a7bff75b | 449 | ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1)); |
d1d81d4c UW |
450 | if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0, |
451 | &ip6h->saddr)) { | |
452 | kfree_skb(skb); | |
453 | return NULL; | |
454 | } | |
36cff5a1 | 455 | ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); |
08b202b6 YH |
456 | |
457 | hopopt = (u8 *)(ip6h + 1); | |
458 | hopopt[0] = IPPROTO_ICMPV6; /* next hdr */ | |
459 | hopopt[1] = 0; /* length of HbH */ | |
460 | hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */ | |
461 | hopopt[3] = 2; /* Length of RA Option */ | |
462 | hopopt[4] = 0; /* Type = 0x0000 (MLD) */ | |
463 | hopopt[5] = 0; | |
1de5a71c EZ |
464 | hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */ |
465 | hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */ | |
08b202b6 YH |
466 | |
467 | skb_put(skb, sizeof(*ip6h) + 8); | |
468 | ||
469 | /* ICMPv6 */ | |
470 | skb_set_transport_header(skb, skb->len); | |
471 | mldq = (struct mld_msg *) icmp6_hdr(skb); | |
472 | ||
32de868c LL |
473 | interval = ipv6_addr_any(group) ? |
474 | br->multicast_query_response_interval : | |
475 | br->multicast_last_member_interval; | |
08b202b6 YH |
476 | |
477 | mldq->mld_type = ICMPV6_MGM_QUERY; | |
478 | mldq->mld_code = 0; | |
479 | mldq->mld_cksum = 0; | |
480 | mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); | |
481 | mldq->mld_reserved = 0; | |
4e3fd7a0 | 482 | mldq->mld_mca = *group; |
08b202b6 YH |
483 | |
484 | /* checksum */ | |
485 | mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
486 | sizeof(*mldq), IPPROTO_ICMPV6, | |
487 | csum_partial(mldq, | |
488 | sizeof(*mldq), 0)); | |
489 | skb_put(skb, sizeof(*mldq)); | |
490 | ||
491 | __skb_pull(skb, sizeof(*eth)); | |
492 | ||
493 | out: | |
494 | return skb; | |
495 | } | |
496 | #endif | |
497 | ||
8ef2a9a5 YH |
498 | static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, |
499 | struct br_ip *addr) | |
500 | { | |
501 | switch (addr->proto) { | |
502 | case htons(ETH_P_IP): | |
503 | return br_ip4_multicast_alloc_query(br, addr->u.ip4); | |
dfd56b8b | 504 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
505 | case htons(ETH_P_IPV6): |
506 | return br_ip6_multicast_alloc_query(br, &addr->u.ip6); | |
507 | #endif | |
8ef2a9a5 YH |
508 | } |
509 | return NULL; | |
510 | } | |
511 | ||
eb1d1641 | 512 | static struct net_bridge_mdb_entry *br_multicast_get_group( |
8ef2a9a5 YH |
513 | struct net_bridge *br, struct net_bridge_port *port, |
514 | struct br_ip *group, int hash) | |
eb1d1641 | 515 | { |
e8051688 | 516 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 | 517 | struct net_bridge_mdb_entry *mp; |
95c96174 ED |
518 | unsigned int count = 0; |
519 | unsigned int max; | |
eb1d1641 HX |
520 | int elasticity; |
521 | int err; | |
522 | ||
e8051688 | 523 | mdb = rcu_dereference_protected(br->mdb, 1); |
b67bfe0d | 524 | hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) { |
eb1d1641 | 525 | count++; |
8ef2a9a5 | 526 | if (unlikely(br_ip_equal(group, &mp->addr))) |
eb1d1641 | 527 | return mp; |
eb1d1641 HX |
528 | } |
529 | ||
530 | elasticity = 0; | |
531 | max = mdb->max; | |
532 | ||
533 | if (unlikely(count > br->hash_elasticity && count)) { | |
534 | if (net_ratelimit()) | |
28a16c97 | 535 | br_info(br, "Multicast hash table " |
536 | "chain limit reached: %s\n", | |
537 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
538 | |
539 | elasticity = br->hash_elasticity; | |
540 | } | |
541 | ||
542 | if (mdb->size >= max) { | |
543 | max *= 2; | |
036be6db TG |
544 | if (unlikely(max > br->hash_max)) { |
545 | br_warn(br, "Multicast hash table maximum of %d " | |
546 | "reached, disabling snooping: %s\n", | |
547 | br->hash_max, | |
548 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
549 | err = -E2BIG; |
550 | disable: | |
551 | br->multicast_disabled = 1; | |
552 | goto err; | |
553 | } | |
554 | } | |
555 | ||
556 | if (max > mdb->max || elasticity) { | |
557 | if (mdb->old) { | |
558 | if (net_ratelimit()) | |
28a16c97 | 559 | br_info(br, "Multicast hash table " |
560 | "on fire: %s\n", | |
561 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
562 | err = -EEXIST; |
563 | goto err; | |
564 | } | |
565 | ||
566 | err = br_mdb_rehash(&br->mdb, max, elasticity); | |
567 | if (err) { | |
28a16c97 | 568 | br_warn(br, "Cannot rehash multicast " |
569 | "hash table, disabling snooping: %s, %d, %d\n", | |
570 | port ? port->dev->name : br->dev->name, | |
571 | mdb->size, err); | |
eb1d1641 HX |
572 | goto disable; |
573 | } | |
574 | ||
575 | err = -EAGAIN; | |
576 | goto err; | |
577 | } | |
578 | ||
579 | return NULL; | |
580 | ||
581 | err: | |
582 | mp = ERR_PTR(err); | |
583 | return mp; | |
584 | } | |
585 | ||
cfd56754 CW |
586 | struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br, |
587 | struct net_bridge_port *port, struct br_ip *group) | |
eb1d1641 | 588 | { |
e8051688 | 589 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 HX |
590 | struct net_bridge_mdb_entry *mp; |
591 | int hash; | |
4c0833bc | 592 | int err; |
eb1d1641 | 593 | |
e8051688 | 594 | mdb = rcu_dereference_protected(br->mdb, 1); |
eb1d1641 | 595 | if (!mdb) { |
4c0833bc TK |
596 | err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0); |
597 | if (err) | |
598 | return ERR_PTR(err); | |
eb1d1641 HX |
599 | goto rehash; |
600 | } | |
601 | ||
602 | hash = br_ip_hash(mdb, group); | |
603 | mp = br_multicast_get_group(br, port, group, hash); | |
604 | switch (PTR_ERR(mp)) { | |
605 | case 0: | |
606 | break; | |
607 | ||
608 | case -EAGAIN: | |
609 | rehash: | |
e8051688 | 610 | mdb = rcu_dereference_protected(br->mdb, 1); |
eb1d1641 HX |
611 | hash = br_ip_hash(mdb, group); |
612 | break; | |
613 | ||
614 | default: | |
615 | goto out; | |
616 | } | |
617 | ||
618 | mp = kzalloc(sizeof(*mp), GFP_ATOMIC); | |
619 | if (unlikely(!mp)) | |
4c0833bc | 620 | return ERR_PTR(-ENOMEM); |
eb1d1641 HX |
621 | |
622 | mp->br = br; | |
8ef2a9a5 | 623 | mp->addr = *group; |
1faabf2a ED |
624 | setup_timer(&mp->timer, br_multicast_group_expired, |
625 | (unsigned long)mp); | |
626 | ||
eb1d1641 HX |
627 | hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]); |
628 | mdb->size++; | |
629 | ||
630 | out: | |
631 | return mp; | |
632 | } | |
633 | ||
cfd56754 CW |
634 | struct net_bridge_port_group *br_multicast_new_port_group( |
635 | struct net_bridge_port *port, | |
636 | struct br_ip *group, | |
ccb1c31a AW |
637 | struct net_bridge_port_group __rcu *next, |
638 | unsigned char state) | |
cfd56754 CW |
639 | { |
640 | struct net_bridge_port_group *p; | |
641 | ||
642 | p = kzalloc(sizeof(*p), GFP_ATOMIC); | |
643 | if (unlikely(!p)) | |
644 | return NULL; | |
645 | ||
646 | p->addr = *group; | |
647 | p->port = port; | |
ccb1c31a | 648 | p->state = state; |
eca2a43b | 649 | rcu_assign_pointer(p->next, next); |
cfd56754 CW |
650 | hlist_add_head(&p->mglist, &port->mglist); |
651 | setup_timer(&p->timer, br_multicast_port_group_expired, | |
652 | (unsigned long)p); | |
653 | return p; | |
654 | } | |
655 | ||
eb1d1641 | 656 | static int br_multicast_add_group(struct net_bridge *br, |
8ef2a9a5 YH |
657 | struct net_bridge_port *port, |
658 | struct br_ip *group) | |
eb1d1641 HX |
659 | { |
660 | struct net_bridge_mdb_entry *mp; | |
661 | struct net_bridge_port_group *p; | |
e8051688 | 662 | struct net_bridge_port_group __rcu **pp; |
454594f3 | 663 | unsigned long now = jiffies; |
eb1d1641 HX |
664 | int err; |
665 | ||
eb1d1641 HX |
666 | spin_lock(&br->multicast_lock); |
667 | if (!netif_running(br->dev) || | |
668 | (port && port->state == BR_STATE_DISABLED)) | |
669 | goto out; | |
670 | ||
671 | mp = br_multicast_new_group(br, port, group); | |
672 | err = PTR_ERR(mp); | |
4c0833bc | 673 | if (IS_ERR(mp)) |
eb1d1641 HX |
674 | goto err; |
675 | ||
676 | if (!port) { | |
8a870178 | 677 | mp->mglist = true; |
454594f3 | 678 | mod_timer(&mp->timer, now + br->multicast_membership_interval); |
eb1d1641 HX |
679 | goto out; |
680 | } | |
681 | ||
e8051688 ED |
682 | for (pp = &mp->ports; |
683 | (p = mlock_dereference(*pp, br)) != NULL; | |
684 | pp = &p->next) { | |
eb1d1641 | 685 | if (p->port == port) |
454594f3 | 686 | goto found; |
eb1d1641 HX |
687 | if ((unsigned long)p->port < (unsigned long)port) |
688 | break; | |
689 | } | |
690 | ||
ccb1c31a | 691 | p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY); |
eb1d1641 HX |
692 | if (unlikely(!p)) |
693 | goto err; | |
eb1d1641 | 694 | rcu_assign_pointer(*pp, p); |
37a393bc | 695 | br_mdb_notify(br->dev, port, group, RTM_NEWMDB); |
eb1d1641 | 696 | |
454594f3 LL |
697 | found: |
698 | mod_timer(&p->timer, now + br->multicast_membership_interval); | |
eb1d1641 HX |
699 | out: |
700 | err = 0; | |
701 | ||
702 | err: | |
703 | spin_unlock(&br->multicast_lock); | |
704 | return err; | |
705 | } | |
706 | ||
8ef2a9a5 YH |
707 | static int br_ip4_multicast_add_group(struct net_bridge *br, |
708 | struct net_bridge_port *port, | |
b0e9a30d VY |
709 | __be32 group, |
710 | __u16 vid) | |
8ef2a9a5 YH |
711 | { |
712 | struct br_ip br_group; | |
713 | ||
714 | if (ipv4_is_local_multicast(group)) | |
715 | return 0; | |
716 | ||
717 | br_group.u.ip4 = group; | |
718 | br_group.proto = htons(ETH_P_IP); | |
b0e9a30d | 719 | br_group.vid = vid; |
8ef2a9a5 YH |
720 | |
721 | return br_multicast_add_group(br, port, &br_group); | |
722 | } | |
723 | ||
dfd56b8b | 724 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
725 | static int br_ip6_multicast_add_group(struct net_bridge *br, |
726 | struct net_bridge_port *port, | |
b0e9a30d VY |
727 | const struct in6_addr *group, |
728 | __u16 vid) | |
08b202b6 YH |
729 | { |
730 | struct br_ip br_group; | |
731 | ||
3c3769e6 | 732 | if (ipv6_addr_is_ll_all_nodes(group)) |
08b202b6 YH |
733 | return 0; |
734 | ||
4e3fd7a0 | 735 | br_group.u.ip6 = *group; |
9cc6e0c4 | 736 | br_group.proto = htons(ETH_P_IPV6); |
b0e9a30d | 737 | br_group.vid = vid; |
08b202b6 YH |
738 | |
739 | return br_multicast_add_group(br, port, &br_group); | |
740 | } | |
741 | #endif | |
742 | ||
eb1d1641 HX |
743 | static void br_multicast_router_expired(unsigned long data) |
744 | { | |
745 | struct net_bridge_port *port = (void *)data; | |
746 | struct net_bridge *br = port->br; | |
747 | ||
748 | spin_lock(&br->multicast_lock); | |
749 | if (port->multicast_router != 1 || | |
750 | timer_pending(&port->multicast_router_timer) || | |
751 | hlist_unhashed(&port->rlist)) | |
752 | goto out; | |
753 | ||
754 | hlist_del_init_rcu(&port->rlist); | |
755 | ||
756 | out: | |
757 | spin_unlock(&br->multicast_lock); | |
758 | } | |
759 | ||
760 | static void br_multicast_local_router_expired(unsigned long data) | |
761 | { | |
762 | } | |
763 | ||
cc0fdd80 | 764 | static void br_multicast_querier_expired(struct net_bridge *br, |
90010b36 | 765 | struct bridge_mcast_own_query *query) |
c83b8fab | 766 | { |
c83b8fab HX |
767 | spin_lock(&br->multicast_lock); |
768 | if (!netif_running(br->dev) || br->multicast_disabled) | |
769 | goto out; | |
770 | ||
cc0fdd80 | 771 | br_multicast_start_querier(br, query); |
c83b8fab HX |
772 | |
773 | out: | |
774 | spin_unlock(&br->multicast_lock); | |
775 | } | |
776 | ||
cc0fdd80 LL |
777 | static void br_ip4_multicast_querier_expired(unsigned long data) |
778 | { | |
779 | struct net_bridge *br = (void *)data; | |
780 | ||
90010b36 | 781 | br_multicast_querier_expired(br, &br->ip4_own_query); |
cc0fdd80 LL |
782 | } |
783 | ||
784 | #if IS_ENABLED(CONFIG_IPV6) | |
785 | static void br_ip6_multicast_querier_expired(unsigned long data) | |
786 | { | |
787 | struct net_bridge *br = (void *)data; | |
788 | ||
90010b36 | 789 | br_multicast_querier_expired(br, &br->ip6_own_query); |
cc0fdd80 LL |
790 | } |
791 | #endif | |
792 | ||
dc4eb53a LL |
793 | static void br_multicast_select_own_querier(struct net_bridge *br, |
794 | struct br_ip *ip, | |
795 | struct sk_buff *skb) | |
796 | { | |
797 | if (ip->proto == htons(ETH_P_IP)) | |
798 | br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr; | |
799 | #if IS_ENABLED(CONFIG_IPV6) | |
800 | else | |
801 | br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr; | |
802 | #endif | |
803 | } | |
804 | ||
8ef2a9a5 YH |
805 | static void __br_multicast_send_query(struct net_bridge *br, |
806 | struct net_bridge_port *port, | |
807 | struct br_ip *ip) | |
eb1d1641 | 808 | { |
eb1d1641 HX |
809 | struct sk_buff *skb; |
810 | ||
8ef2a9a5 | 811 | skb = br_multicast_alloc_query(br, ip); |
eb1d1641 | 812 | if (!skb) |
8ef2a9a5 | 813 | return; |
eb1d1641 HX |
814 | |
815 | if (port) { | |
eb1d1641 | 816 | skb->dev = port->dev; |
7026b1dd DM |
817 | NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, NULL, skb, |
818 | NULL, skb->dev, | |
f0b4eece | 819 | br_dev_queue_push_xmit); |
dc4eb53a LL |
820 | } else { |
821 | br_multicast_select_own_querier(br, ip, skb); | |
eb1d1641 | 822 | netif_rx(skb); |
dc4eb53a | 823 | } |
8ef2a9a5 YH |
824 | } |
825 | ||
826 | static void br_multicast_send_query(struct net_bridge *br, | |
cc0fdd80 | 827 | struct net_bridge_port *port, |
90010b36 | 828 | struct bridge_mcast_own_query *own_query) |
8ef2a9a5 YH |
829 | { |
830 | unsigned long time; | |
831 | struct br_ip br_group; | |
90010b36 | 832 | struct bridge_mcast_other_query *other_query = NULL; |
8ef2a9a5 YH |
833 | |
834 | if (!netif_running(br->dev) || br->multicast_disabled || | |
cc0fdd80 | 835 | !br->multicast_querier) |
8ef2a9a5 YH |
836 | return; |
837 | ||
08b202b6 YH |
838 | memset(&br_group.u, 0, sizeof(br_group.u)); |
839 | ||
90010b36 LL |
840 | if (port ? (own_query == &port->ip4_own_query) : |
841 | (own_query == &br->ip4_own_query)) { | |
842 | other_query = &br->ip4_other_query; | |
cc0fdd80 | 843 | br_group.proto = htons(ETH_P_IP); |
dfd56b8b | 844 | #if IS_ENABLED(CONFIG_IPV6) |
cc0fdd80 | 845 | } else { |
90010b36 | 846 | other_query = &br->ip6_other_query; |
cc0fdd80 | 847 | br_group.proto = htons(ETH_P_IPV6); |
08b202b6 | 848 | #endif |
cc0fdd80 LL |
849 | } |
850 | ||
90010b36 | 851 | if (!other_query || timer_pending(&other_query->timer)) |
cc0fdd80 LL |
852 | return; |
853 | ||
854 | __br_multicast_send_query(br, port, &br_group); | |
eb1d1641 | 855 | |
eb1d1641 | 856 | time = jiffies; |
90010b36 | 857 | time += own_query->startup_sent < br->multicast_startup_query_count ? |
eb1d1641 HX |
858 | br->multicast_startup_query_interval : |
859 | br->multicast_query_interval; | |
90010b36 | 860 | mod_timer(&own_query->timer, time); |
eb1d1641 HX |
861 | } |
862 | ||
90010b36 LL |
863 | static void |
864 | br_multicast_port_query_expired(struct net_bridge_port *port, | |
865 | struct bridge_mcast_own_query *query) | |
eb1d1641 | 866 | { |
eb1d1641 HX |
867 | struct net_bridge *br = port->br; |
868 | ||
869 | spin_lock(&br->multicast_lock); | |
02a780c0 DC |
870 | if (port->state == BR_STATE_DISABLED || |
871 | port->state == BR_STATE_BLOCKING) | |
eb1d1641 HX |
872 | goto out; |
873 | ||
cc0fdd80 LL |
874 | if (query->startup_sent < br->multicast_startup_query_count) |
875 | query->startup_sent++; | |
eb1d1641 | 876 | |
cc0fdd80 | 877 | br_multicast_send_query(port->br, port, query); |
eb1d1641 HX |
878 | |
879 | out: | |
880 | spin_unlock(&br->multicast_lock); | |
881 | } | |
882 | ||
cc0fdd80 LL |
883 | static void br_ip4_multicast_port_query_expired(unsigned long data) |
884 | { | |
885 | struct net_bridge_port *port = (void *)data; | |
886 | ||
90010b36 | 887 | br_multicast_port_query_expired(port, &port->ip4_own_query); |
cc0fdd80 LL |
888 | } |
889 | ||
890 | #if IS_ENABLED(CONFIG_IPV6) | |
891 | static void br_ip6_multicast_port_query_expired(unsigned long data) | |
892 | { | |
893 | struct net_bridge_port *port = (void *)data; | |
894 | ||
90010b36 | 895 | br_multicast_port_query_expired(port, &port->ip6_own_query); |
cc0fdd80 LL |
896 | } |
897 | #endif | |
898 | ||
eb1d1641 HX |
899 | void br_multicast_add_port(struct net_bridge_port *port) |
900 | { | |
901 | port->multicast_router = 1; | |
902 | ||
903 | setup_timer(&port->multicast_router_timer, br_multicast_router_expired, | |
904 | (unsigned long)port); | |
90010b36 LL |
905 | setup_timer(&port->ip4_own_query.timer, |
906 | br_ip4_multicast_port_query_expired, (unsigned long)port); | |
cc0fdd80 | 907 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 LL |
908 | setup_timer(&port->ip6_own_query.timer, |
909 | br_ip6_multicast_port_query_expired, (unsigned long)port); | |
cc0fdd80 | 910 | #endif |
eb1d1641 HX |
911 | } |
912 | ||
913 | void br_multicast_del_port(struct net_bridge_port *port) | |
914 | { | |
915 | del_timer_sync(&port->multicast_router_timer); | |
916 | } | |
917 | ||
90010b36 | 918 | static void br_multicast_enable(struct bridge_mcast_own_query *query) |
561f1103 | 919 | { |
cc0fdd80 | 920 | query->startup_sent = 0; |
561f1103 | 921 | |
cc0fdd80 LL |
922 | if (try_to_del_timer_sync(&query->timer) >= 0 || |
923 | del_timer(&query->timer)) | |
924 | mod_timer(&query->timer, jiffies); | |
561f1103 HX |
925 | } |
926 | ||
eb1d1641 HX |
927 | void br_multicast_enable_port(struct net_bridge_port *port) |
928 | { | |
929 | struct net_bridge *br = port->br; | |
930 | ||
931 | spin_lock(&br->multicast_lock); | |
932 | if (br->multicast_disabled || !netif_running(br->dev)) | |
933 | goto out; | |
934 | ||
90010b36 | 935 | br_multicast_enable(&port->ip4_own_query); |
cc0fdd80 | 936 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 | 937 | br_multicast_enable(&port->ip6_own_query); |
cc0fdd80 | 938 | #endif |
eb1d1641 HX |
939 | |
940 | out: | |
941 | spin_unlock(&br->multicast_lock); | |
942 | } | |
943 | ||
944 | void br_multicast_disable_port(struct net_bridge_port *port) | |
945 | { | |
946 | struct net_bridge *br = port->br; | |
947 | struct net_bridge_port_group *pg; | |
b67bfe0d | 948 | struct hlist_node *n; |
eb1d1641 HX |
949 | |
950 | spin_lock(&br->multicast_lock); | |
b67bfe0d | 951 | hlist_for_each_entry_safe(pg, n, &port->mglist, mglist) |
eb1d1641 HX |
952 | br_multicast_del_pg(br, pg); |
953 | ||
954 | if (!hlist_unhashed(&port->rlist)) | |
955 | hlist_del_init_rcu(&port->rlist); | |
956 | del_timer(&port->multicast_router_timer); | |
90010b36 | 957 | del_timer(&port->ip4_own_query.timer); |
cc0fdd80 | 958 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 | 959 | del_timer(&port->ip6_own_query.timer); |
cc0fdd80 | 960 | #endif |
eb1d1641 HX |
961 | spin_unlock(&br->multicast_lock); |
962 | } | |
963 | ||
8ef2a9a5 YH |
964 | static int br_ip4_multicast_igmp3_report(struct net_bridge *br, |
965 | struct net_bridge_port *port, | |
06499098 VY |
966 | struct sk_buff *skb, |
967 | u16 vid) | |
eb1d1641 HX |
968 | { |
969 | struct igmpv3_report *ih; | |
970 | struct igmpv3_grec *grec; | |
971 | int i; | |
972 | int len; | |
973 | int num; | |
974 | int type; | |
975 | int err = 0; | |
976 | __be32 group; | |
977 | ||
eb1d1641 HX |
978 | ih = igmpv3_report_hdr(skb); |
979 | num = ntohs(ih->ngrec); | |
980 | len = sizeof(*ih); | |
981 | ||
982 | for (i = 0; i < num; i++) { | |
983 | len += sizeof(*grec); | |
984 | if (!pskb_may_pull(skb, len)) | |
985 | return -EINVAL; | |
986 | ||
fd218cf9 | 987 | grec = (void *)(skb->data + len - sizeof(*grec)); |
eb1d1641 HX |
988 | group = grec->grec_mca; |
989 | type = grec->grec_type; | |
990 | ||
8eabf95c | 991 | len += ntohs(grec->grec_nsrcs) * 4; |
eb1d1641 HX |
992 | if (!pskb_may_pull(skb, len)) |
993 | return -EINVAL; | |
994 | ||
995 | /* We treat this as an IGMPv2 report for now. */ | |
996 | switch (type) { | |
997 | case IGMPV3_MODE_IS_INCLUDE: | |
998 | case IGMPV3_MODE_IS_EXCLUDE: | |
999 | case IGMPV3_CHANGE_TO_INCLUDE: | |
1000 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
1001 | case IGMPV3_ALLOW_NEW_SOURCES: | |
1002 | case IGMPV3_BLOCK_OLD_SOURCES: | |
1003 | break; | |
1004 | ||
1005 | default: | |
1006 | continue; | |
1007 | } | |
1008 | ||
b0e9a30d | 1009 | err = br_ip4_multicast_add_group(br, port, group, vid); |
eb1d1641 HX |
1010 | if (err) |
1011 | break; | |
1012 | } | |
1013 | ||
1014 | return err; | |
1015 | } | |
1016 | ||
dfd56b8b | 1017 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1018 | static int br_ip6_multicast_mld2_report(struct net_bridge *br, |
1019 | struct net_bridge_port *port, | |
06499098 VY |
1020 | struct sk_buff *skb, |
1021 | u16 vid) | |
08b202b6 YH |
1022 | { |
1023 | struct icmp6hdr *icmp6h; | |
1024 | struct mld2_grec *grec; | |
1025 | int i; | |
1026 | int len; | |
1027 | int num; | |
1028 | int err = 0; | |
1029 | ||
1030 | if (!pskb_may_pull(skb, sizeof(*icmp6h))) | |
1031 | return -EINVAL; | |
1032 | ||
1033 | icmp6h = icmp6_hdr(skb); | |
1034 | num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); | |
1035 | len = sizeof(*icmp6h); | |
1036 | ||
1037 | for (i = 0; i < num; i++) { | |
1038 | __be16 *nsrcs, _nsrcs; | |
1039 | ||
1040 | nsrcs = skb_header_pointer(skb, | |
1041 | len + offsetof(struct mld2_grec, | |
649e984d | 1042 | grec_nsrcs), |
08b202b6 YH |
1043 | sizeof(_nsrcs), &_nsrcs); |
1044 | if (!nsrcs) | |
1045 | return -EINVAL; | |
1046 | ||
1047 | if (!pskb_may_pull(skb, | |
1048 | len + sizeof(*grec) + | |
d41db9f3 | 1049 | sizeof(struct in6_addr) * ntohs(*nsrcs))) |
08b202b6 YH |
1050 | return -EINVAL; |
1051 | ||
1052 | grec = (struct mld2_grec *)(skb->data + len); | |
d41db9f3 LL |
1053 | len += sizeof(*grec) + |
1054 | sizeof(struct in6_addr) * ntohs(*nsrcs); | |
08b202b6 YH |
1055 | |
1056 | /* We treat these as MLDv1 reports for now. */ | |
1057 | switch (grec->grec_type) { | |
1058 | case MLD2_MODE_IS_INCLUDE: | |
1059 | case MLD2_MODE_IS_EXCLUDE: | |
1060 | case MLD2_CHANGE_TO_INCLUDE: | |
1061 | case MLD2_CHANGE_TO_EXCLUDE: | |
1062 | case MLD2_ALLOW_NEW_SOURCES: | |
1063 | case MLD2_BLOCK_OLD_SOURCES: | |
1064 | break; | |
1065 | ||
1066 | default: | |
1067 | continue; | |
1068 | } | |
1069 | ||
b0e9a30d VY |
1070 | err = br_ip6_multicast_add_group(br, port, &grec->grec_mca, |
1071 | vid); | |
08b202b6 YH |
1072 | if (!err) |
1073 | break; | |
1074 | } | |
1075 | ||
1076 | return err; | |
1077 | } | |
1078 | #endif | |
1079 | ||
dc4eb53a | 1080 | static bool br_ip4_multicast_select_querier(struct net_bridge *br, |
2cd41431 | 1081 | struct net_bridge_port *port, |
dc4eb53a LL |
1082 | __be32 saddr) |
1083 | { | |
1084 | if (!timer_pending(&br->ip4_own_query.timer) && | |
1085 | !timer_pending(&br->ip4_other_query.timer)) | |
1086 | goto update; | |
1087 | ||
1088 | if (!br->ip4_querier.addr.u.ip4) | |
1089 | goto update; | |
1090 | ||
1091 | if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4)) | |
1092 | goto update; | |
1093 | ||
1094 | return false; | |
1095 | ||
1096 | update: | |
1097 | br->ip4_querier.addr.u.ip4 = saddr; | |
1098 | ||
2cd41431 LL |
1099 | /* update protected by general multicast_lock by caller */ |
1100 | rcu_assign_pointer(br->ip4_querier.port, port); | |
1101 | ||
dc4eb53a LL |
1102 | return true; |
1103 | } | |
1104 | ||
1105 | #if IS_ENABLED(CONFIG_IPV6) | |
1106 | static bool br_ip6_multicast_select_querier(struct net_bridge *br, | |
2cd41431 | 1107 | struct net_bridge_port *port, |
dc4eb53a LL |
1108 | struct in6_addr *saddr) |
1109 | { | |
1110 | if (!timer_pending(&br->ip6_own_query.timer) && | |
1111 | !timer_pending(&br->ip6_other_query.timer)) | |
1112 | goto update; | |
1113 | ||
1114 | if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0) | |
1115 | goto update; | |
1116 | ||
1117 | return false; | |
1118 | ||
1119 | update: | |
1120 | br->ip6_querier.addr.u.ip6 = *saddr; | |
1121 | ||
2cd41431 LL |
1122 | /* update protected by general multicast_lock by caller */ |
1123 | rcu_assign_pointer(br->ip6_querier.port, port); | |
1124 | ||
dc4eb53a LL |
1125 | return true; |
1126 | } | |
1127 | #endif | |
1128 | ||
1129 | static bool br_multicast_select_querier(struct net_bridge *br, | |
2cd41431 | 1130 | struct net_bridge_port *port, |
dc4eb53a LL |
1131 | struct br_ip *saddr) |
1132 | { | |
1133 | switch (saddr->proto) { | |
1134 | case htons(ETH_P_IP): | |
2cd41431 | 1135 | return br_ip4_multicast_select_querier(br, port, saddr->u.ip4); |
dc4eb53a LL |
1136 | #if IS_ENABLED(CONFIG_IPV6) |
1137 | case htons(ETH_P_IPV6): | |
2cd41431 | 1138 | return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6); |
dc4eb53a LL |
1139 | #endif |
1140 | } | |
1141 | ||
1142 | return false; | |
1143 | } | |
1144 | ||
cc0fdd80 | 1145 | static void |
90010b36 LL |
1146 | br_multicast_update_query_timer(struct net_bridge *br, |
1147 | struct bridge_mcast_other_query *query, | |
1148 | unsigned long max_delay) | |
b00589af | 1149 | { |
90010b36 LL |
1150 | if (!timer_pending(&query->timer)) |
1151 | query->delay_time = jiffies + max_delay; | |
b00589af | 1152 | |
90010b36 | 1153 | mod_timer(&query->timer, jiffies + br->multicast_querier_interval); |
b00589af LL |
1154 | } |
1155 | ||
7e80c124 | 1156 | /* |
7c77602f | 1157 | * Add port to router_list |
7e80c124 | 1158 | * list is maintained ordered by pointer value |
1159 | * and locked by br->multicast_lock and RCU | |
1160 | */ | |
0909e117 HX |
1161 | static void br_multicast_add_router(struct net_bridge *br, |
1162 | struct net_bridge_port *port) | |
1163 | { | |
dcdca2c4 | 1164 | struct net_bridge_port *p; |
b67bfe0d | 1165 | struct hlist_node *slot = NULL; |
dcdca2c4 | 1166 | |
b67bfe0d | 1167 | hlist_for_each_entry(p, &br->router_list, rlist) { |
7e80c124 | 1168 | if ((unsigned long) port >= (unsigned long) p) |
1169 | break; | |
b67bfe0d | 1170 | slot = &p->rlist; |
dcdca2c4 | 1171 | } |
1172 | ||
7e80c124 | 1173 | if (slot) |
1d023284 | 1174 | hlist_add_behind_rcu(&port->rlist, slot); |
dcdca2c4 | 1175 | else |
1176 | hlist_add_head_rcu(&port->rlist, &br->router_list); | |
0909e117 HX |
1177 | } |
1178 | ||
eb1d1641 HX |
1179 | static void br_multicast_mark_router(struct net_bridge *br, |
1180 | struct net_bridge_port *port) | |
1181 | { | |
1182 | unsigned long now = jiffies; | |
eb1d1641 HX |
1183 | |
1184 | if (!port) { | |
1185 | if (br->multicast_router == 1) | |
1186 | mod_timer(&br->multicast_router_timer, | |
1187 | now + br->multicast_querier_interval); | |
1188 | return; | |
1189 | } | |
1190 | ||
1191 | if (port->multicast_router != 1) | |
1192 | return; | |
1193 | ||
1194 | if (!hlist_unhashed(&port->rlist)) | |
1195 | goto timer; | |
1196 | ||
0909e117 | 1197 | br_multicast_add_router(br, port); |
eb1d1641 HX |
1198 | |
1199 | timer: | |
1200 | mod_timer(&port->multicast_router_timer, | |
1201 | now + br->multicast_querier_interval); | |
1202 | } | |
1203 | ||
1204 | static void br_multicast_query_received(struct net_bridge *br, | |
1205 | struct net_bridge_port *port, | |
90010b36 | 1206 | struct bridge_mcast_other_query *query, |
dc4eb53a | 1207 | struct br_ip *saddr, |
b00589af | 1208 | unsigned long max_delay) |
eb1d1641 | 1209 | { |
2cd41431 | 1210 | if (!br_multicast_select_querier(br, port, saddr)) |
eb1d1641 HX |
1211 | return; |
1212 | ||
dc4eb53a | 1213 | br_multicast_update_query_timer(br, query, max_delay); |
eb1d1641 HX |
1214 | br_multicast_mark_router(br, port); |
1215 | } | |
1216 | ||
8ef2a9a5 YH |
1217 | static int br_ip4_multicast_query(struct net_bridge *br, |
1218 | struct net_bridge_port *port, | |
06499098 VY |
1219 | struct sk_buff *skb, |
1220 | u16 vid) | |
eb1d1641 | 1221 | { |
b71d1d42 | 1222 | const struct iphdr *iph = ip_hdr(skb); |
eb1d1641 HX |
1223 | struct igmphdr *ih = igmp_hdr(skb); |
1224 | struct net_bridge_mdb_entry *mp; | |
1225 | struct igmpv3_query *ih3; | |
1226 | struct net_bridge_port_group *p; | |
e8051688 | 1227 | struct net_bridge_port_group __rcu **pp; |
dc4eb53a | 1228 | struct br_ip saddr; |
eb1d1641 HX |
1229 | unsigned long max_delay; |
1230 | unsigned long now = jiffies; | |
1231 | __be32 group; | |
bec68ff1 | 1232 | int err = 0; |
eb1d1641 HX |
1233 | |
1234 | spin_lock(&br->multicast_lock); | |
1235 | if (!netif_running(br->dev) || | |
1236 | (port && port->state == BR_STATE_DISABLED)) | |
1237 | goto out; | |
1238 | ||
eb1d1641 HX |
1239 | group = ih->group; |
1240 | ||
1241 | if (skb->len == sizeof(*ih)) { | |
1242 | max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); | |
1243 | ||
1244 | if (!max_delay) { | |
1245 | max_delay = 10 * HZ; | |
1246 | group = 0; | |
1247 | } | |
9afd85c9 | 1248 | } else if (skb->len >= sizeof(*ih3)) { |
eb1d1641 HX |
1249 | ih3 = igmpv3_query_hdr(skb); |
1250 | if (ih3->nsrcs) | |
bec68ff1 | 1251 | goto out; |
eb1d1641 | 1252 | |
0ba8c9ec YH |
1253 | max_delay = ih3->code ? |
1254 | IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; | |
9afd85c9 | 1255 | } else { |
9ed973cc LL |
1256 | goto out; |
1257 | } | |
1258 | ||
dc4eb53a LL |
1259 | if (!group) { |
1260 | saddr.proto = htons(ETH_P_IP); | |
1261 | saddr.u.ip4 = iph->saddr; | |
b00589af | 1262 | |
dc4eb53a LL |
1263 | br_multicast_query_received(br, port, &br->ip4_other_query, |
1264 | &saddr, max_delay); | |
eb1d1641 | 1265 | goto out; |
dc4eb53a | 1266 | } |
eb1d1641 | 1267 | |
b0e9a30d | 1268 | mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid); |
eb1d1641 HX |
1269 | if (!mp) |
1270 | goto out; | |
1271 | ||
1272 | max_delay *= br->multicast_last_member_count; | |
1273 | ||
8a870178 | 1274 | if (mp->mglist && |
eb1d1641 HX |
1275 | (timer_pending(&mp->timer) ? |
1276 | time_after(mp->timer.expires, now + max_delay) : | |
1277 | try_to_del_timer_sync(&mp->timer) >= 0)) | |
1278 | mod_timer(&mp->timer, now + max_delay); | |
1279 | ||
e8051688 ED |
1280 | for (pp = &mp->ports; |
1281 | (p = mlock_dereference(*pp, br)) != NULL; | |
1282 | pp = &p->next) { | |
eb1d1641 HX |
1283 | if (timer_pending(&p->timer) ? |
1284 | time_after(p->timer.expires, now + max_delay) : | |
1285 | try_to_del_timer_sync(&p->timer) >= 0) | |
24f9cdcb | 1286 | mod_timer(&p->timer, now + max_delay); |
eb1d1641 HX |
1287 | } |
1288 | ||
1289 | out: | |
1290 | spin_unlock(&br->multicast_lock); | |
bec68ff1 | 1291 | return err; |
eb1d1641 HX |
1292 | } |
1293 | ||
dfd56b8b | 1294 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1295 | static int br_ip6_multicast_query(struct net_bridge *br, |
1296 | struct net_bridge_port *port, | |
06499098 VY |
1297 | struct sk_buff *skb, |
1298 | u16 vid) | |
08b202b6 | 1299 | { |
b71d1d42 | 1300 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
eca2a43b | 1301 | struct mld_msg *mld; |
08b202b6 YH |
1302 | struct net_bridge_mdb_entry *mp; |
1303 | struct mld2_query *mld2q; | |
e8051688 ED |
1304 | struct net_bridge_port_group *p; |
1305 | struct net_bridge_port_group __rcu **pp; | |
dc4eb53a | 1306 | struct br_ip saddr; |
08b202b6 YH |
1307 | unsigned long max_delay; |
1308 | unsigned long now = jiffies; | |
b71d1d42 | 1309 | const struct in6_addr *group = NULL; |
9ed973cc | 1310 | bool is_general_query; |
08b202b6 YH |
1311 | int err = 0; |
1312 | ||
1313 | spin_lock(&br->multicast_lock); | |
1314 | if (!netif_running(br->dev) || | |
1315 | (port && port->state == BR_STATE_DISABLED)) | |
1316 | goto out; | |
1317 | ||
08b202b6 YH |
1318 | if (skb->len == sizeof(*mld)) { |
1319 | if (!pskb_may_pull(skb, sizeof(*mld))) { | |
1320 | err = -EINVAL; | |
1321 | goto out; | |
1322 | } | |
1323 | mld = (struct mld_msg *) icmp6_hdr(skb); | |
4715213d | 1324 | max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay)); |
08b202b6 YH |
1325 | if (max_delay) |
1326 | group = &mld->mld_mca; | |
248ba8ec | 1327 | } else { |
08b202b6 YH |
1328 | if (!pskb_may_pull(skb, sizeof(*mld2q))) { |
1329 | err = -EINVAL; | |
1330 | goto out; | |
1331 | } | |
1332 | mld2q = (struct mld2_query *)icmp6_hdr(skb); | |
1333 | if (!mld2q->mld2q_nsrcs) | |
1334 | group = &mld2q->mld2q_mca; | |
e3f5b170 DB |
1335 | |
1336 | max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL); | |
08b202b6 YH |
1337 | } |
1338 | ||
9ed973cc LL |
1339 | is_general_query = group && ipv6_addr_any(group); |
1340 | ||
dc4eb53a LL |
1341 | if (is_general_query) { |
1342 | saddr.proto = htons(ETH_P_IPV6); | |
1343 | saddr.u.ip6 = ip6h->saddr; | |
b00589af | 1344 | |
dc4eb53a LL |
1345 | br_multicast_query_received(br, port, &br->ip6_other_query, |
1346 | &saddr, max_delay); | |
08b202b6 | 1347 | goto out; |
6c03ee8b LL |
1348 | } else if (!group) { |
1349 | goto out; | |
dc4eb53a | 1350 | } |
08b202b6 | 1351 | |
b0e9a30d | 1352 | mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid); |
08b202b6 YH |
1353 | if (!mp) |
1354 | goto out; | |
1355 | ||
1356 | max_delay *= br->multicast_last_member_count; | |
8a870178 | 1357 | if (mp->mglist && |
08b202b6 YH |
1358 | (timer_pending(&mp->timer) ? |
1359 | time_after(mp->timer.expires, now + max_delay) : | |
1360 | try_to_del_timer_sync(&mp->timer) >= 0)) | |
1361 | mod_timer(&mp->timer, now + max_delay); | |
1362 | ||
e8051688 ED |
1363 | for (pp = &mp->ports; |
1364 | (p = mlock_dereference(*pp, br)) != NULL; | |
1365 | pp = &p->next) { | |
08b202b6 YH |
1366 | if (timer_pending(&p->timer) ? |
1367 | time_after(p->timer.expires, now + max_delay) : | |
1368 | try_to_del_timer_sync(&p->timer) >= 0) | |
24f9cdcb | 1369 | mod_timer(&p->timer, now + max_delay); |
08b202b6 YH |
1370 | } |
1371 | ||
1372 | out: | |
1373 | spin_unlock(&br->multicast_lock); | |
1374 | return err; | |
1375 | } | |
1376 | #endif | |
1377 | ||
90010b36 LL |
1378 | static void |
1379 | br_multicast_leave_group(struct net_bridge *br, | |
1380 | struct net_bridge_port *port, | |
1381 | struct br_ip *group, | |
1382 | struct bridge_mcast_other_query *other_query, | |
1383 | struct bridge_mcast_own_query *own_query) | |
eb1d1641 HX |
1384 | { |
1385 | struct net_bridge_mdb_htable *mdb; | |
1386 | struct net_bridge_mdb_entry *mp; | |
1387 | struct net_bridge_port_group *p; | |
1388 | unsigned long now; | |
1389 | unsigned long time; | |
1390 | ||
eb1d1641 HX |
1391 | spin_lock(&br->multicast_lock); |
1392 | if (!netif_running(br->dev) || | |
1393 | (port && port->state == BR_STATE_DISABLED) || | |
90010b36 | 1394 | timer_pending(&other_query->timer)) |
eb1d1641 HX |
1395 | goto out; |
1396 | ||
e8051688 | 1397 | mdb = mlock_dereference(br->mdb, br); |
eb1d1641 HX |
1398 | mp = br_mdb_ip_get(mdb, group); |
1399 | if (!mp) | |
1400 | goto out; | |
1401 | ||
cc0fdd80 | 1402 | if (br->multicast_querier) { |
6b7df111 CW |
1403 | __br_multicast_send_query(br, port, &mp->addr); |
1404 | ||
1405 | time = jiffies + br->multicast_last_member_count * | |
1406 | br->multicast_last_member_interval; | |
cc0fdd80 | 1407 | |
90010b36 | 1408 | mod_timer(&own_query->timer, time); |
6b7df111 CW |
1409 | |
1410 | for (p = mlock_dereference(mp->ports, br); | |
1411 | p != NULL; | |
1412 | p = mlock_dereference(p->next, br)) { | |
1413 | if (p->port != port) | |
1414 | continue; | |
1415 | ||
1416 | if (!hlist_unhashed(&p->mglist) && | |
1417 | (timer_pending(&p->timer) ? | |
1418 | time_after(p->timer.expires, time) : | |
1419 | try_to_del_timer_sync(&p->timer) >= 0)) { | |
1420 | mod_timer(&p->timer, time); | |
1421 | } | |
1422 | ||
1423 | break; | |
1424 | } | |
1425 | } | |
1426 | ||
c2d3babf | 1427 | if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) { |
50426b59 AW |
1428 | struct net_bridge_port_group __rcu **pp; |
1429 | ||
1430 | for (pp = &mp->ports; | |
1431 | (p = mlock_dereference(*pp, br)) != NULL; | |
1432 | pp = &p->next) { | |
1433 | if (p->port != port) | |
1434 | continue; | |
1435 | ||
1436 | rcu_assign_pointer(*pp, p->next); | |
1437 | hlist_del_init(&p->mglist); | |
1438 | del_timer(&p->timer); | |
1439 | call_rcu_bh(&p->rcu, br_multicast_free_pg); | |
37a393bc | 1440 | br_mdb_notify(br->dev, port, group, RTM_DELMDB); |
50426b59 | 1441 | |
454594f3 | 1442 | if (!mp->ports && !mp->mglist && |
50426b59 AW |
1443 | netif_running(br->dev)) |
1444 | mod_timer(&mp->timer, jiffies); | |
1445 | } | |
1446 | goto out; | |
1447 | } | |
1448 | ||
eb1d1641 HX |
1449 | now = jiffies; |
1450 | time = now + br->multicast_last_member_count * | |
1451 | br->multicast_last_member_interval; | |
1452 | ||
1453 | if (!port) { | |
454594f3 | 1454 | if (mp->mglist && |
eb1d1641 HX |
1455 | (timer_pending(&mp->timer) ? |
1456 | time_after(mp->timer.expires, time) : | |
1457 | try_to_del_timer_sync(&mp->timer) >= 0)) { | |
1458 | mod_timer(&mp->timer, time); | |
eb1d1641 | 1459 | } |
454594f3 LL |
1460 | |
1461 | goto out; | |
1462 | } | |
1463 | ||
1464 | for (p = mlock_dereference(mp->ports, br); | |
1465 | p != NULL; | |
1466 | p = mlock_dereference(p->next, br)) { | |
1467 | if (p->port != port) | |
1468 | continue; | |
1469 | ||
1470 | if (!hlist_unhashed(&p->mglist) && | |
1471 | (timer_pending(&p->timer) ? | |
1472 | time_after(p->timer.expires, time) : | |
1473 | try_to_del_timer_sync(&p->timer) >= 0)) { | |
1474 | mod_timer(&p->timer, time); | |
1475 | } | |
1476 | ||
1477 | break; | |
eb1d1641 | 1478 | } |
eb1d1641 HX |
1479 | out: |
1480 | spin_unlock(&br->multicast_lock); | |
1481 | } | |
1482 | ||
8ef2a9a5 YH |
1483 | static void br_ip4_multicast_leave_group(struct net_bridge *br, |
1484 | struct net_bridge_port *port, | |
b0e9a30d VY |
1485 | __be32 group, |
1486 | __u16 vid) | |
8ef2a9a5 YH |
1487 | { |
1488 | struct br_ip br_group; | |
90010b36 | 1489 | struct bridge_mcast_own_query *own_query; |
8ef2a9a5 YH |
1490 | |
1491 | if (ipv4_is_local_multicast(group)) | |
1492 | return; | |
1493 | ||
90010b36 LL |
1494 | own_query = port ? &port->ip4_own_query : &br->ip4_own_query; |
1495 | ||
8ef2a9a5 YH |
1496 | br_group.u.ip4 = group; |
1497 | br_group.proto = htons(ETH_P_IP); | |
b0e9a30d | 1498 | br_group.vid = vid; |
8ef2a9a5 | 1499 | |
90010b36 LL |
1500 | br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query, |
1501 | own_query); | |
8ef2a9a5 YH |
1502 | } |
1503 | ||
dfd56b8b | 1504 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1505 | static void br_ip6_multicast_leave_group(struct net_bridge *br, |
1506 | struct net_bridge_port *port, | |
b0e9a30d VY |
1507 | const struct in6_addr *group, |
1508 | __u16 vid) | |
08b202b6 YH |
1509 | { |
1510 | struct br_ip br_group; | |
90010b36 | 1511 | struct bridge_mcast_own_query *own_query; |
08b202b6 | 1512 | |
3c3769e6 | 1513 | if (ipv6_addr_is_ll_all_nodes(group)) |
08b202b6 YH |
1514 | return; |
1515 | ||
90010b36 LL |
1516 | own_query = port ? &port->ip6_own_query : &br->ip6_own_query; |
1517 | ||
4e3fd7a0 | 1518 | br_group.u.ip6 = *group; |
08b202b6 | 1519 | br_group.proto = htons(ETH_P_IPV6); |
b0e9a30d | 1520 | br_group.vid = vid; |
08b202b6 | 1521 | |
90010b36 LL |
1522 | br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query, |
1523 | own_query); | |
08b202b6 YH |
1524 | } |
1525 | #endif | |
8ef2a9a5 | 1526 | |
eb1d1641 HX |
1527 | static int br_multicast_ipv4_rcv(struct net_bridge *br, |
1528 | struct net_bridge_port *port, | |
06499098 VY |
1529 | struct sk_buff *skb, |
1530 | u16 vid) | |
eb1d1641 | 1531 | { |
9afd85c9 | 1532 | struct sk_buff *skb_trimmed = NULL; |
eb1d1641 | 1533 | struct igmphdr *ih; |
eb1d1641 HX |
1534 | int err; |
1535 | ||
9afd85c9 | 1536 | err = ip_mc_check_igmp(skb, &skb_trimmed); |
eb1d1641 | 1537 | |
9afd85c9 LL |
1538 | if (err == -ENOMSG) { |
1539 | if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) | |
bd4265fe | 1540 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
eb1d1641 | 1541 | return 0; |
9afd85c9 LL |
1542 | } else if (err < 0) { |
1543 | return err; | |
bd4265fe | 1544 | } |
eb1d1641 | 1545 | |
eb1d1641 | 1546 | BR_INPUT_SKB_CB(skb)->igmp = 1; |
9afd85c9 | 1547 | ih = igmp_hdr(skb); |
eb1d1641 HX |
1548 | |
1549 | switch (ih->type) { | |
1550 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1551 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
62b2bcb4 | 1552 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
b0e9a30d | 1553 | err = br_ip4_multicast_add_group(br, port, ih->group, vid); |
eb1d1641 HX |
1554 | break; |
1555 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
9afd85c9 | 1556 | err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid); |
eb1d1641 HX |
1557 | break; |
1558 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
9afd85c9 | 1559 | err = br_ip4_multicast_query(br, port, skb_trimmed, vid); |
eb1d1641 HX |
1560 | break; |
1561 | case IGMP_HOST_LEAVE_MESSAGE: | |
b0e9a30d | 1562 | br_ip4_multicast_leave_group(br, port, ih->group, vid); |
eb1d1641 HX |
1563 | break; |
1564 | } | |
1565 | ||
9afd85c9 LL |
1566 | if (skb_trimmed) |
1567 | kfree_skb(skb_trimmed); | |
1568 | ||
eb1d1641 HX |
1569 | return err; |
1570 | } | |
1571 | ||
dfd56b8b | 1572 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1573 | static int br_multicast_ipv6_rcv(struct net_bridge *br, |
1574 | struct net_bridge_port *port, | |
06499098 VY |
1575 | struct sk_buff *skb, |
1576 | u16 vid) | |
08b202b6 | 1577 | { |
9afd85c9 LL |
1578 | struct sk_buff *skb_trimmed = NULL; |
1579 | struct mld_msg *mld; | |
08b202b6 YH |
1580 | int err; |
1581 | ||
9afd85c9 | 1582 | err = ipv6_mc_check_mld(skb, &skb_trimmed); |
08b202b6 | 1583 | |
9afd85c9 LL |
1584 | if (err == -ENOMSG) { |
1585 | if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr)) | |
1586 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; | |
08b202b6 | 1587 | return 0; |
9afd85c9 LL |
1588 | } else if (err < 0) { |
1589 | return err; | |
08b202b6 YH |
1590 | } |
1591 | ||
08b202b6 | 1592 | BR_INPUT_SKB_CB(skb)->igmp = 1; |
9afd85c9 | 1593 | mld = (struct mld_msg *)skb_transport_header(skb); |
08b202b6 | 1594 | |
9afd85c9 | 1595 | switch (mld->mld_type) { |
08b202b6 | 1596 | case ICMPV6_MGM_REPORT: |
fc2af6c7 | 1597 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
b0e9a30d | 1598 | err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid); |
08b202b6 | 1599 | break; |
08b202b6 | 1600 | case ICMPV6_MLD2_REPORT: |
9afd85c9 | 1601 | err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid); |
08b202b6 YH |
1602 | break; |
1603 | case ICMPV6_MGM_QUERY: | |
9afd85c9 | 1604 | err = br_ip6_multicast_query(br, port, skb_trimmed, vid); |
08b202b6 YH |
1605 | break; |
1606 | case ICMPV6_MGM_REDUCTION: | |
b0e9a30d | 1607 | br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid); |
9afd85c9 | 1608 | break; |
08b202b6 YH |
1609 | } |
1610 | ||
9afd85c9 LL |
1611 | if (skb_trimmed) |
1612 | kfree_skb(skb_trimmed); | |
1613 | ||
08b202b6 YH |
1614 | return err; |
1615 | } | |
1616 | #endif | |
1617 | ||
eb1d1641 | 1618 | int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, |
06499098 | 1619 | struct sk_buff *skb, u16 vid) |
eb1d1641 | 1620 | { |
1fafc7a9 YH |
1621 | BR_INPUT_SKB_CB(skb)->igmp = 0; |
1622 | BR_INPUT_SKB_CB(skb)->mrouters_only = 0; | |
1623 | ||
eb1d1641 HX |
1624 | if (br->multicast_disabled) |
1625 | return 0; | |
1626 | ||
1627 | switch (skb->protocol) { | |
1628 | case htons(ETH_P_IP): | |
06499098 | 1629 | return br_multicast_ipv4_rcv(br, port, skb, vid); |
dfd56b8b | 1630 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 1631 | case htons(ETH_P_IPV6): |
06499098 | 1632 | return br_multicast_ipv6_rcv(br, port, skb, vid); |
08b202b6 | 1633 | #endif |
eb1d1641 HX |
1634 | } |
1635 | ||
1636 | return 0; | |
1637 | } | |
1638 | ||
cc0fdd80 | 1639 | static void br_multicast_query_expired(struct net_bridge *br, |
2cd41431 LL |
1640 | struct bridge_mcast_own_query *query, |
1641 | struct bridge_mcast_querier *querier) | |
cc0fdd80 LL |
1642 | { |
1643 | spin_lock(&br->multicast_lock); | |
1644 | if (query->startup_sent < br->multicast_startup_query_count) | |
1645 | query->startup_sent++; | |
1646 | ||
0932997e | 1647 | RCU_INIT_POINTER(querier, NULL); |
cc0fdd80 LL |
1648 | br_multicast_send_query(br, NULL, query); |
1649 | spin_unlock(&br->multicast_lock); | |
1650 | } | |
1651 | ||
1652 | static void br_ip4_multicast_query_expired(unsigned long data) | |
eb1d1641 HX |
1653 | { |
1654 | struct net_bridge *br = (void *)data; | |
1655 | ||
2cd41431 | 1656 | br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier); |
cc0fdd80 | 1657 | } |
eb1d1641 | 1658 | |
cc0fdd80 LL |
1659 | #if IS_ENABLED(CONFIG_IPV6) |
1660 | static void br_ip6_multicast_query_expired(unsigned long data) | |
1661 | { | |
1662 | struct net_bridge *br = (void *)data; | |
eb1d1641 | 1663 | |
2cd41431 | 1664 | br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier); |
eb1d1641 | 1665 | } |
cc0fdd80 | 1666 | #endif |
eb1d1641 HX |
1667 | |
1668 | void br_multicast_init(struct net_bridge *br) | |
1669 | { | |
1670 | br->hash_elasticity = 4; | |
1671 | br->hash_max = 512; | |
1672 | ||
1673 | br->multicast_router = 1; | |
c5c23260 | 1674 | br->multicast_querier = 0; |
1c8ad5bf | 1675 | br->multicast_query_use_ifaddr = 0; |
eb1d1641 HX |
1676 | br->multicast_last_member_count = 2; |
1677 | br->multicast_startup_query_count = 2; | |
1678 | ||
1679 | br->multicast_last_member_interval = HZ; | |
1680 | br->multicast_query_response_interval = 10 * HZ; | |
1681 | br->multicast_startup_query_interval = 125 * HZ / 4; | |
1682 | br->multicast_query_interval = 125 * HZ; | |
1683 | br->multicast_querier_interval = 255 * HZ; | |
1684 | br->multicast_membership_interval = 260 * HZ; | |
1685 | ||
90010b36 | 1686 | br->ip4_other_query.delay_time = 0; |
2cd41431 | 1687 | br->ip4_querier.port = NULL; |
cc0fdd80 | 1688 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 | 1689 | br->ip6_other_query.delay_time = 0; |
2cd41431 | 1690 | br->ip6_querier.port = NULL; |
cc0fdd80 | 1691 | #endif |
b00589af | 1692 | |
eb1d1641 HX |
1693 | spin_lock_init(&br->multicast_lock); |
1694 | setup_timer(&br->multicast_router_timer, | |
1695 | br_multicast_local_router_expired, 0); | |
90010b36 LL |
1696 | setup_timer(&br->ip4_other_query.timer, |
1697 | br_ip4_multicast_querier_expired, (unsigned long)br); | |
1698 | setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired, | |
eb1d1641 | 1699 | (unsigned long)br); |
cc0fdd80 | 1700 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 LL |
1701 | setup_timer(&br->ip6_other_query.timer, |
1702 | br_ip6_multicast_querier_expired, (unsigned long)br); | |
1703 | setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired, | |
cc0fdd80 LL |
1704 | (unsigned long)br); |
1705 | #endif | |
eb1d1641 HX |
1706 | } |
1707 | ||
cc0fdd80 | 1708 | static void __br_multicast_open(struct net_bridge *br, |
90010b36 | 1709 | struct bridge_mcast_own_query *query) |
eb1d1641 | 1710 | { |
cc0fdd80 | 1711 | query->startup_sent = 0; |
eb1d1641 HX |
1712 | |
1713 | if (br->multicast_disabled) | |
1714 | return; | |
1715 | ||
cc0fdd80 LL |
1716 | mod_timer(&query->timer, jiffies); |
1717 | } | |
1718 | ||
1719 | void br_multicast_open(struct net_bridge *br) | |
1720 | { | |
90010b36 | 1721 | __br_multicast_open(br, &br->ip4_own_query); |
cc0fdd80 | 1722 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 | 1723 | __br_multicast_open(br, &br->ip6_own_query); |
cc0fdd80 | 1724 | #endif |
eb1d1641 HX |
1725 | } |
1726 | ||
1727 | void br_multicast_stop(struct net_bridge *br) | |
1728 | { | |
1729 | struct net_bridge_mdb_htable *mdb; | |
1730 | struct net_bridge_mdb_entry *mp; | |
b67bfe0d | 1731 | struct hlist_node *n; |
eb1d1641 HX |
1732 | u32 ver; |
1733 | int i; | |
1734 | ||
1735 | del_timer_sync(&br->multicast_router_timer); | |
90010b36 LL |
1736 | del_timer_sync(&br->ip4_other_query.timer); |
1737 | del_timer_sync(&br->ip4_own_query.timer); | |
cc0fdd80 | 1738 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 LL |
1739 | del_timer_sync(&br->ip6_other_query.timer); |
1740 | del_timer_sync(&br->ip6_own_query.timer); | |
cc0fdd80 | 1741 | #endif |
eb1d1641 HX |
1742 | |
1743 | spin_lock_bh(&br->multicast_lock); | |
e8051688 | 1744 | mdb = mlock_dereference(br->mdb, br); |
eb1d1641 HX |
1745 | if (!mdb) |
1746 | goto out; | |
1747 | ||
1748 | br->mdb = NULL; | |
1749 | ||
1750 | ver = mdb->ver; | |
1751 | for (i = 0; i < mdb->max; i++) { | |
b67bfe0d | 1752 | hlist_for_each_entry_safe(mp, n, &mdb->mhash[i], |
eb1d1641 HX |
1753 | hlist[ver]) { |
1754 | del_timer(&mp->timer); | |
eb1d1641 HX |
1755 | call_rcu_bh(&mp->rcu, br_multicast_free_group); |
1756 | } | |
1757 | } | |
1758 | ||
1759 | if (mdb->old) { | |
1760 | spin_unlock_bh(&br->multicast_lock); | |
10cc2b50 | 1761 | rcu_barrier_bh(); |
eb1d1641 HX |
1762 | spin_lock_bh(&br->multicast_lock); |
1763 | WARN_ON(mdb->old); | |
1764 | } | |
1765 | ||
1766 | mdb->old = mdb; | |
1767 | call_rcu_bh(&mdb->rcu, br_mdb_free); | |
1768 | ||
1769 | out: | |
1770 | spin_unlock_bh(&br->multicast_lock); | |
1771 | } | |
0909e117 HX |
1772 | |
1773 | int br_multicast_set_router(struct net_bridge *br, unsigned long val) | |
1774 | { | |
1775 | int err = -ENOENT; | |
1776 | ||
1777 | spin_lock_bh(&br->multicast_lock); | |
1778 | if (!netif_running(br->dev)) | |
1779 | goto unlock; | |
1780 | ||
1781 | switch (val) { | |
1782 | case 0: | |
1783 | case 2: | |
1784 | del_timer(&br->multicast_router_timer); | |
1785 | /* fall through */ | |
1786 | case 1: | |
1787 | br->multicast_router = val; | |
1788 | err = 0; | |
1789 | break; | |
1790 | ||
1791 | default: | |
1792 | err = -EINVAL; | |
1793 | break; | |
1794 | } | |
1795 | ||
1796 | unlock: | |
1797 | spin_unlock_bh(&br->multicast_lock); | |
1798 | ||
1799 | return err; | |
1800 | } | |
1801 | ||
1802 | int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) | |
1803 | { | |
1804 | struct net_bridge *br = p->br; | |
1805 | int err = -ENOENT; | |
1806 | ||
1807 | spin_lock(&br->multicast_lock); | |
1808 | if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED) | |
1809 | goto unlock; | |
1810 | ||
1811 | switch (val) { | |
1812 | case 0: | |
1813 | case 1: | |
1814 | case 2: | |
1815 | p->multicast_router = val; | |
1816 | err = 0; | |
1817 | ||
1818 | if (val < 2 && !hlist_unhashed(&p->rlist)) | |
1819 | hlist_del_init_rcu(&p->rlist); | |
1820 | ||
1821 | if (val == 1) | |
1822 | break; | |
1823 | ||
1824 | del_timer(&p->multicast_router_timer); | |
1825 | ||
1826 | if (val == 0) | |
1827 | break; | |
1828 | ||
1829 | br_multicast_add_router(br, p); | |
1830 | break; | |
1831 | ||
1832 | default: | |
1833 | err = -EINVAL; | |
1834 | break; | |
1835 | } | |
1836 | ||
1837 | unlock: | |
1838 | spin_unlock(&br->multicast_lock); | |
1839 | ||
1840 | return err; | |
1841 | } | |
561f1103 | 1842 | |
cc0fdd80 | 1843 | static void br_multicast_start_querier(struct net_bridge *br, |
90010b36 | 1844 | struct bridge_mcast_own_query *query) |
561f1103 HX |
1845 | { |
1846 | struct net_bridge_port *port; | |
74857216 | 1847 | |
cc0fdd80 | 1848 | __br_multicast_open(br, query); |
74857216 HX |
1849 | |
1850 | list_for_each_entry(port, &br->port_list, list) { | |
1851 | if (port->state == BR_STATE_DISABLED || | |
1852 | port->state == BR_STATE_BLOCKING) | |
1853 | continue; | |
1854 | ||
90010b36 LL |
1855 | if (query == &br->ip4_own_query) |
1856 | br_multicast_enable(&port->ip4_own_query); | |
cc0fdd80 LL |
1857 | #if IS_ENABLED(CONFIG_IPV6) |
1858 | else | |
90010b36 | 1859 | br_multicast_enable(&port->ip6_own_query); |
cc0fdd80 | 1860 | #endif |
74857216 HX |
1861 | } |
1862 | } | |
1863 | ||
1864 | int br_multicast_toggle(struct net_bridge *br, unsigned long val) | |
1865 | { | |
3a7fda06 | 1866 | int err = 0; |
e8051688 | 1867 | struct net_bridge_mdb_htable *mdb; |
561f1103 | 1868 | |
ef5e0d82 | 1869 | spin_lock_bh(&br->multicast_lock); |
561f1103 HX |
1870 | if (br->multicast_disabled == !val) |
1871 | goto unlock; | |
1872 | ||
1873 | br->multicast_disabled = !val; | |
1874 | if (br->multicast_disabled) | |
1875 | goto unlock; | |
1876 | ||
3a7fda06 HX |
1877 | if (!netif_running(br->dev)) |
1878 | goto unlock; | |
1879 | ||
e8051688 ED |
1880 | mdb = mlock_dereference(br->mdb, br); |
1881 | if (mdb) { | |
1882 | if (mdb->old) { | |
561f1103 HX |
1883 | err = -EEXIST; |
1884 | rollback: | |
1885 | br->multicast_disabled = !!val; | |
1886 | goto unlock; | |
1887 | } | |
1888 | ||
e8051688 | 1889 | err = br_mdb_rehash(&br->mdb, mdb->max, |
561f1103 HX |
1890 | br->hash_elasticity); |
1891 | if (err) | |
1892 | goto rollback; | |
1893 | } | |
1894 | ||
90010b36 | 1895 | br_multicast_start_querier(br, &br->ip4_own_query); |
cc0fdd80 | 1896 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 | 1897 | br_multicast_start_querier(br, &br->ip6_own_query); |
cc0fdd80 | 1898 | #endif |
561f1103 HX |
1899 | |
1900 | unlock: | |
ef5e0d82 | 1901 | spin_unlock_bh(&br->multicast_lock); |
561f1103 HX |
1902 | |
1903 | return err; | |
1904 | } | |
b195167f | 1905 | |
c5c23260 HX |
1906 | int br_multicast_set_querier(struct net_bridge *br, unsigned long val) |
1907 | { | |
b00589af LL |
1908 | unsigned long max_delay; |
1909 | ||
c5c23260 HX |
1910 | val = !!val; |
1911 | ||
1912 | spin_lock_bh(&br->multicast_lock); | |
1913 | if (br->multicast_querier == val) | |
1914 | goto unlock; | |
1915 | ||
1916 | br->multicast_querier = val; | |
b00589af LL |
1917 | if (!val) |
1918 | goto unlock; | |
1919 | ||
1920 | max_delay = br->multicast_query_response_interval; | |
b00589af | 1921 | |
90010b36 LL |
1922 | if (!timer_pending(&br->ip4_other_query.timer)) |
1923 | br->ip4_other_query.delay_time = jiffies + max_delay; | |
cc0fdd80 | 1924 | |
90010b36 | 1925 | br_multicast_start_querier(br, &br->ip4_own_query); |
cc0fdd80 LL |
1926 | |
1927 | #if IS_ENABLED(CONFIG_IPV6) | |
90010b36 LL |
1928 | if (!timer_pending(&br->ip6_other_query.timer)) |
1929 | br->ip6_other_query.delay_time = jiffies + max_delay; | |
cc0fdd80 | 1930 | |
90010b36 | 1931 | br_multicast_start_querier(br, &br->ip6_own_query); |
cc0fdd80 | 1932 | #endif |
c5c23260 HX |
1933 | |
1934 | unlock: | |
1935 | spin_unlock_bh(&br->multicast_lock); | |
1936 | ||
1937 | return 0; | |
1938 | } | |
1939 | ||
b195167f HX |
1940 | int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) |
1941 | { | |
1942 | int err = -ENOENT; | |
1943 | u32 old; | |
e8051688 | 1944 | struct net_bridge_mdb_htable *mdb; |
b195167f | 1945 | |
fe0d692b | 1946 | spin_lock_bh(&br->multicast_lock); |
b195167f HX |
1947 | if (!netif_running(br->dev)) |
1948 | goto unlock; | |
1949 | ||
1950 | err = -EINVAL; | |
1951 | if (!is_power_of_2(val)) | |
1952 | goto unlock; | |
e8051688 ED |
1953 | |
1954 | mdb = mlock_dereference(br->mdb, br); | |
1955 | if (mdb && val < mdb->size) | |
b195167f HX |
1956 | goto unlock; |
1957 | ||
1958 | err = 0; | |
1959 | ||
1960 | old = br->hash_max; | |
1961 | br->hash_max = val; | |
1962 | ||
e8051688 ED |
1963 | if (mdb) { |
1964 | if (mdb->old) { | |
b195167f HX |
1965 | err = -EEXIST; |
1966 | rollback: | |
1967 | br->hash_max = old; | |
1968 | goto unlock; | |
1969 | } | |
1970 | ||
1971 | err = br_mdb_rehash(&br->mdb, br->hash_max, | |
1972 | br->hash_elasticity); | |
1973 | if (err) | |
1974 | goto rollback; | |
1975 | } | |
1976 | ||
1977 | unlock: | |
fe0d692b | 1978 | spin_unlock_bh(&br->multicast_lock); |
b195167f HX |
1979 | |
1980 | return err; | |
1981 | } | |
07f8ac4a LL |
1982 | |
1983 | /** | |
1984 | * br_multicast_list_adjacent - Returns snooped multicast addresses | |
1985 | * @dev: The bridge port adjacent to which to retrieve addresses | |
1986 | * @br_ip_list: The list to store found, snooped multicast IP addresses in | |
1987 | * | |
1988 | * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast | |
1989 | * snooping feature on all bridge ports of dev's bridge device, excluding | |
1990 | * the addresses from dev itself. | |
1991 | * | |
1992 | * Returns the number of items added to br_ip_list. | |
1993 | * | |
1994 | * Notes: | |
1995 | * - br_ip_list needs to be initialized by caller | |
1996 | * - br_ip_list might contain duplicates in the end | |
1997 | * (needs to be taken care of by caller) | |
1998 | * - br_ip_list needs to be freed by caller | |
1999 | */ | |
2000 | int br_multicast_list_adjacent(struct net_device *dev, | |
2001 | struct list_head *br_ip_list) | |
2002 | { | |
2003 | struct net_bridge *br; | |
2004 | struct net_bridge_port *port; | |
2005 | struct net_bridge_port_group *group; | |
2006 | struct br_ip_list *entry; | |
2007 | int count = 0; | |
2008 | ||
2009 | rcu_read_lock(); | |
2010 | if (!br_ip_list || !br_port_exists(dev)) | |
2011 | goto unlock; | |
2012 | ||
2013 | port = br_port_get_rcu(dev); | |
2014 | if (!port || !port->br) | |
2015 | goto unlock; | |
2016 | ||
2017 | br = port->br; | |
2018 | ||
2019 | list_for_each_entry_rcu(port, &br->port_list, list) { | |
2020 | if (!port->dev || port->dev == dev) | |
2021 | continue; | |
2022 | ||
2023 | hlist_for_each_entry_rcu(group, &port->mglist, mglist) { | |
2024 | entry = kmalloc(sizeof(*entry), GFP_ATOMIC); | |
2025 | if (!entry) | |
2026 | goto unlock; | |
2027 | ||
2028 | entry->addr = group->addr; | |
2029 | list_add(&entry->list, br_ip_list); | |
2030 | count++; | |
2031 | } | |
2032 | } | |
2033 | ||
2034 | unlock: | |
2035 | rcu_read_unlock(); | |
2036 | return count; | |
2037 | } | |
2038 | EXPORT_SYMBOL_GPL(br_multicast_list_adjacent); | |
2cd41431 | 2039 | |
c34963e2 LL |
2040 | /** |
2041 | * br_multicast_has_querier_anywhere - Checks for a querier on a bridge | |
2042 | * @dev: The bridge port providing the bridge on which to check for a querier | |
2043 | * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 | |
2044 | * | |
2045 | * Checks whether the given interface has a bridge on top and if so returns | |
2046 | * true if a valid querier exists anywhere on the bridged link layer. | |
2047 | * Otherwise returns false. | |
2048 | */ | |
2049 | bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto) | |
2050 | { | |
2051 | struct net_bridge *br; | |
2052 | struct net_bridge_port *port; | |
2053 | struct ethhdr eth; | |
2054 | bool ret = false; | |
2055 | ||
2056 | rcu_read_lock(); | |
2057 | if (!br_port_exists(dev)) | |
2058 | goto unlock; | |
2059 | ||
2060 | port = br_port_get_rcu(dev); | |
2061 | if (!port || !port->br) | |
2062 | goto unlock; | |
2063 | ||
2064 | br = port->br; | |
2065 | ||
2066 | memset(ð, 0, sizeof(eth)); | |
2067 | eth.h_proto = htons(proto); | |
2068 | ||
2069 | ret = br_multicast_querier_exists(br, ð); | |
2070 | ||
2071 | unlock: | |
2072 | rcu_read_unlock(); | |
2073 | return ret; | |
2074 | } | |
2075 | EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere); | |
2076 | ||
2cd41431 LL |
2077 | /** |
2078 | * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port | |
2079 | * @dev: The bridge port adjacent to which to check for a querier | |
2080 | * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 | |
2081 | * | |
2082 | * Checks whether the given interface has a bridge on top and if so returns | |
2083 | * true if a selected querier is behind one of the other ports of this | |
2084 | * bridge. Otherwise returns false. | |
2085 | */ | |
2086 | bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto) | |
2087 | { | |
2088 | struct net_bridge *br; | |
2089 | struct net_bridge_port *port; | |
2090 | bool ret = false; | |
2091 | ||
2092 | rcu_read_lock(); | |
2093 | if (!br_port_exists(dev)) | |
2094 | goto unlock; | |
2095 | ||
2096 | port = br_port_get_rcu(dev); | |
2097 | if (!port || !port->br) | |
2098 | goto unlock; | |
2099 | ||
2100 | br = port->br; | |
2101 | ||
2102 | switch (proto) { | |
2103 | case ETH_P_IP: | |
2104 | if (!timer_pending(&br->ip4_other_query.timer) || | |
2105 | rcu_dereference(br->ip4_querier.port) == port) | |
2106 | goto unlock; | |
2107 | break; | |
3993c4e1 | 2108 | #if IS_ENABLED(CONFIG_IPV6) |
2cd41431 LL |
2109 | case ETH_P_IPV6: |
2110 | if (!timer_pending(&br->ip6_other_query.timer) || | |
2111 | rcu_dereference(br->ip6_querier.port) == port) | |
2112 | goto unlock; | |
2113 | break; | |
3993c4e1 | 2114 | #endif |
2cd41431 LL |
2115 | default: |
2116 | goto unlock; | |
2117 | } | |
2118 | ||
2119 | ret = true; | |
2120 | unlock: | |
2121 | rcu_read_unlock(); | |
2122 | return ret; | |
2123 | } | |
2124 | EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent); |