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> | |
14 | #include <linux/if_ether.h> | |
15 | #include <linux/igmp.h> | |
16 | #include <linux/jhash.h> | |
17 | #include <linux/kernel.h> | |
b195167f | 18 | #include <linux/log2.h> |
eb1d1641 HX |
19 | #include <linux/netdevice.h> |
20 | #include <linux/netfilter_bridge.h> | |
21 | #include <linux/random.h> | |
22 | #include <linux/rculist.h> | |
23 | #include <linux/skbuff.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/timer.h> | |
1c8ad5bf | 26 | #include <linux/inetdevice.h> |
eb1d1641 | 27 | #include <net/ip.h> |
dfd56b8b | 28 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
29 | #include <net/ipv6.h> |
30 | #include <net/mld.h> | |
d4c4f07d | 31 | #include <net/ip6_checksum.h> |
3c3769e6 | 32 | #include <net/addrconf.h> |
08b202b6 | 33 | #endif |
eb1d1641 HX |
34 | |
35 | #include "br_private.h" | |
36 | ||
cc0fdd80 | 37 | static void br_multicast_start_querier(struct net_bridge *br, |
90010b36 | 38 | struct bridge_mcast_own_query *query); |
2ce297fc | 39 | unsigned int br_mdb_rehash_seq; |
c83b8fab | 40 | |
8ef2a9a5 YH |
41 | static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b) |
42 | { | |
43 | if (a->proto != b->proto) | |
44 | return 0; | |
b0e9a30d VY |
45 | if (a->vid != b->vid) |
46 | return 0; | |
8ef2a9a5 YH |
47 | switch (a->proto) { |
48 | case htons(ETH_P_IP): | |
49 | return a->u.ip4 == b->u.ip4; | |
dfd56b8b | 50 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
51 | case htons(ETH_P_IPV6): |
52 | return ipv6_addr_equal(&a->u.ip6, &b->u.ip6); | |
53 | #endif | |
8ef2a9a5 YH |
54 | } |
55 | return 0; | |
56 | } | |
57 | ||
b0e9a30d VY |
58 | static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip, |
59 | __u16 vid) | |
eb1d1641 | 60 | { |
b0e9a30d | 61 | return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1); |
eb1d1641 HX |
62 | } |
63 | ||
dfd56b8b | 64 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 65 | static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb, |
b0e9a30d VY |
66 | const struct in6_addr *ip, |
67 | __u16 vid) | |
08b202b6 | 68 | { |
b0e9a30d VY |
69 | return jhash_2words(ipv6_addr_hash(ip), vid, |
70 | mdb->secret) & (mdb->max - 1); | |
08b202b6 YH |
71 | } |
72 | #endif | |
73 | ||
8ef2a9a5 YH |
74 | static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb, |
75 | struct br_ip *ip) | |
76 | { | |
77 | switch (ip->proto) { | |
78 | case htons(ETH_P_IP): | |
b0e9a30d | 79 | return __br_ip4_hash(mdb, ip->u.ip4, ip->vid); |
dfd56b8b | 80 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 81 | case htons(ETH_P_IPV6): |
b0e9a30d | 82 | return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid); |
08b202b6 | 83 | #endif |
8ef2a9a5 YH |
84 | } |
85 | return 0; | |
eb1d1641 HX |
86 | } |
87 | ||
88 | static struct net_bridge_mdb_entry *__br_mdb_ip_get( | |
8ef2a9a5 | 89 | struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash) |
eb1d1641 HX |
90 | { |
91 | struct net_bridge_mdb_entry *mp; | |
eb1d1641 | 92 | |
b67bfe0d | 93 | hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) { |
8ef2a9a5 | 94 | if (br_ip_equal(&mp->addr, dst)) |
eb1d1641 HX |
95 | return mp; |
96 | } | |
97 | ||
98 | return NULL; | |
99 | } | |
100 | ||
cfd56754 CW |
101 | struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, |
102 | struct br_ip *dst) | |
7f285fa7 HX |
103 | { |
104 | if (!mdb) | |
105 | return NULL; | |
106 | ||
107 | return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst)); | |
108 | } | |
109 | ||
8ef2a9a5 | 110 | static struct net_bridge_mdb_entry *br_mdb_ip4_get( |
b0e9a30d | 111 | struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid) |
eb1d1641 | 112 | { |
8ef2a9a5 YH |
113 | struct br_ip br_dst; |
114 | ||
115 | br_dst.u.ip4 = dst; | |
116 | br_dst.proto = htons(ETH_P_IP); | |
b0e9a30d | 117 | br_dst.vid = vid; |
0821ec55 | 118 | |
7f285fa7 | 119 | return br_mdb_ip_get(mdb, &br_dst); |
8ef2a9a5 YH |
120 | } |
121 | ||
dfd56b8b | 122 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 123 | static struct net_bridge_mdb_entry *br_mdb_ip6_get( |
b0e9a30d VY |
124 | struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst, |
125 | __u16 vid) | |
08b202b6 YH |
126 | { |
127 | struct br_ip br_dst; | |
0821ec55 | 128 | |
4e3fd7a0 | 129 | br_dst.u.ip6 = *dst; |
08b202b6 | 130 | br_dst.proto = htons(ETH_P_IPV6); |
b0e9a30d | 131 | br_dst.vid = vid; |
08b202b6 | 132 | |
7f285fa7 | 133 | return br_mdb_ip_get(mdb, &br_dst); |
08b202b6 YH |
134 | } |
135 | #endif | |
136 | ||
eb1d1641 | 137 | struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, |
fbca58a2 | 138 | struct sk_buff *skb, u16 vid) |
eb1d1641 | 139 | { |
e8051688 | 140 | struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb); |
8ef2a9a5 YH |
141 | struct br_ip ip; |
142 | ||
7f285fa7 | 143 | if (br->multicast_disabled) |
eb1d1641 HX |
144 | return NULL; |
145 | ||
8ef2a9a5 | 146 | if (BR_INPUT_SKB_CB(skb)->igmp) |
eb1d1641 HX |
147 | return NULL; |
148 | ||
8ef2a9a5 | 149 | ip.proto = skb->protocol; |
fbca58a2 | 150 | ip.vid = vid; |
8ef2a9a5 | 151 | |
eb1d1641 HX |
152 | switch (skb->protocol) { |
153 | case htons(ETH_P_IP): | |
8ef2a9a5 YH |
154 | ip.u.ip4 = ip_hdr(skb)->daddr; |
155 | break; | |
dfd56b8b | 156 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 157 | case htons(ETH_P_IPV6): |
4e3fd7a0 | 158 | ip.u.ip6 = ipv6_hdr(skb)->daddr; |
08b202b6 YH |
159 | break; |
160 | #endif | |
8ef2a9a5 YH |
161 | default: |
162 | return NULL; | |
eb1d1641 HX |
163 | } |
164 | ||
8ef2a9a5 | 165 | return br_mdb_ip_get(mdb, &ip); |
eb1d1641 HX |
166 | } |
167 | ||
168 | static void br_mdb_free(struct rcu_head *head) | |
169 | { | |
170 | struct net_bridge_mdb_htable *mdb = | |
171 | container_of(head, struct net_bridge_mdb_htable, rcu); | |
172 | struct net_bridge_mdb_htable *old = mdb->old; | |
173 | ||
174 | mdb->old = NULL; | |
175 | kfree(old->mhash); | |
176 | kfree(old); | |
177 | } | |
178 | ||
179 | static int br_mdb_copy(struct net_bridge_mdb_htable *new, | |
180 | struct net_bridge_mdb_htable *old, | |
181 | int elasticity) | |
182 | { | |
183 | struct net_bridge_mdb_entry *mp; | |
eb1d1641 HX |
184 | int maxlen; |
185 | int len; | |
186 | int i; | |
187 | ||
188 | for (i = 0; i < old->max; i++) | |
b67bfe0d | 189 | hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver]) |
eb1d1641 | 190 | hlist_add_head(&mp->hlist[new->ver], |
8ef2a9a5 | 191 | &new->mhash[br_ip_hash(new, &mp->addr)]); |
eb1d1641 HX |
192 | |
193 | if (!elasticity) | |
194 | return 0; | |
195 | ||
196 | maxlen = 0; | |
197 | for (i = 0; i < new->max; i++) { | |
198 | len = 0; | |
b67bfe0d | 199 | hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver]) |
eb1d1641 HX |
200 | len++; |
201 | if (len > maxlen) | |
202 | maxlen = len; | |
203 | } | |
204 | ||
205 | return maxlen > elasticity ? -EINVAL : 0; | |
206 | } | |
207 | ||
cfd56754 | 208 | void br_multicast_free_pg(struct rcu_head *head) |
eb1d1641 HX |
209 | { |
210 | struct net_bridge_port_group *p = | |
211 | container_of(head, struct net_bridge_port_group, rcu); | |
212 | ||
213 | kfree(p); | |
214 | } | |
215 | ||
216 | static void br_multicast_free_group(struct rcu_head *head) | |
217 | { | |
218 | struct net_bridge_mdb_entry *mp = | |
219 | container_of(head, struct net_bridge_mdb_entry, rcu); | |
220 | ||
221 | kfree(mp); | |
222 | } | |
223 | ||
224 | static void br_multicast_group_expired(unsigned long data) | |
225 | { | |
226 | struct net_bridge_mdb_entry *mp = (void *)data; | |
227 | struct net_bridge *br = mp->br; | |
228 | struct net_bridge_mdb_htable *mdb; | |
229 | ||
230 | spin_lock(&br->multicast_lock); | |
231 | if (!netif_running(br->dev) || timer_pending(&mp->timer)) | |
232 | goto out; | |
233 | ||
8a870178 | 234 | mp->mglist = false; |
eb1d1641 HX |
235 | |
236 | if (mp->ports) | |
237 | goto out; | |
238 | ||
e8051688 ED |
239 | mdb = mlock_dereference(br->mdb, br); |
240 | ||
eb1d1641 HX |
241 | hlist_del_rcu(&mp->hlist[mdb->ver]); |
242 | mdb->size--; | |
243 | ||
eb1d1641 HX |
244 | call_rcu_bh(&mp->rcu, br_multicast_free_group); |
245 | ||
246 | out: | |
247 | spin_unlock(&br->multicast_lock); | |
248 | } | |
249 | ||
250 | static void br_multicast_del_pg(struct net_bridge *br, | |
251 | struct net_bridge_port_group *pg) | |
252 | { | |
e8051688 | 253 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 HX |
254 | struct net_bridge_mdb_entry *mp; |
255 | struct net_bridge_port_group *p; | |
e8051688 ED |
256 | struct net_bridge_port_group __rcu **pp; |
257 | ||
258 | mdb = mlock_dereference(br->mdb, br); | |
eb1d1641 | 259 | |
8ef2a9a5 | 260 | mp = br_mdb_ip_get(mdb, &pg->addr); |
eb1d1641 HX |
261 | if (WARN_ON(!mp)) |
262 | return; | |
263 | ||
e8051688 ED |
264 | for (pp = &mp->ports; |
265 | (p = mlock_dereference(*pp, br)) != NULL; | |
266 | pp = &p->next) { | |
eb1d1641 HX |
267 | if (p != pg) |
268 | continue; | |
269 | ||
83f6a740 | 270 | rcu_assign_pointer(*pp, p->next); |
eb1d1641 HX |
271 | hlist_del_init(&p->mglist); |
272 | del_timer(&p->timer); | |
eb1d1641 HX |
273 | call_rcu_bh(&p->rcu, br_multicast_free_pg); |
274 | ||
454594f3 | 275 | if (!mp->ports && !mp->mglist && |
eb1d1641 HX |
276 | netif_running(br->dev)) |
277 | mod_timer(&mp->timer, jiffies); | |
278 | ||
279 | return; | |
280 | } | |
281 | ||
282 | WARN_ON(1); | |
283 | } | |
284 | ||
285 | static void br_multicast_port_group_expired(unsigned long data) | |
286 | { | |
287 | struct net_bridge_port_group *pg = (void *)data; | |
288 | struct net_bridge *br = pg->port->br; | |
289 | ||
290 | spin_lock(&br->multicast_lock); | |
291 | if (!netif_running(br->dev) || timer_pending(&pg->timer) || | |
ccb1c31a | 292 | hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT) |
eb1d1641 HX |
293 | goto out; |
294 | ||
295 | br_multicast_del_pg(br, pg); | |
296 | ||
297 | out: | |
298 | spin_unlock(&br->multicast_lock); | |
299 | } | |
300 | ||
e8051688 | 301 | static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max, |
eb1d1641 HX |
302 | int elasticity) |
303 | { | |
e8051688 | 304 | struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1); |
eb1d1641 HX |
305 | struct net_bridge_mdb_htable *mdb; |
306 | int err; | |
307 | ||
308 | mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC); | |
309 | if (!mdb) | |
310 | return -ENOMEM; | |
311 | ||
312 | mdb->max = max; | |
313 | mdb->old = old; | |
314 | ||
315 | mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC); | |
316 | if (!mdb->mhash) { | |
317 | kfree(mdb); | |
318 | return -ENOMEM; | |
319 | } | |
320 | ||
321 | mdb->size = old ? old->size : 0; | |
322 | mdb->ver = old ? old->ver ^ 1 : 0; | |
323 | ||
324 | if (!old || elasticity) | |
325 | get_random_bytes(&mdb->secret, sizeof(mdb->secret)); | |
326 | else | |
327 | mdb->secret = old->secret; | |
328 | ||
329 | if (!old) | |
330 | goto out; | |
331 | ||
332 | err = br_mdb_copy(mdb, old, elasticity); | |
333 | if (err) { | |
334 | kfree(mdb->mhash); | |
335 | kfree(mdb); | |
336 | return err; | |
337 | } | |
338 | ||
2ce297fc | 339 | br_mdb_rehash_seq++; |
eb1d1641 HX |
340 | call_rcu_bh(&mdb->rcu, br_mdb_free); |
341 | ||
342 | out: | |
343 | rcu_assign_pointer(*mdbp, mdb); | |
344 | ||
345 | return 0; | |
346 | } | |
347 | ||
8ef2a9a5 YH |
348 | static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br, |
349 | __be32 group) | |
eb1d1641 HX |
350 | { |
351 | struct sk_buff *skb; | |
352 | struct igmphdr *ih; | |
353 | struct ethhdr *eth; | |
354 | struct iphdr *iph; | |
355 | ||
356 | skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) + | |
357 | sizeof(*ih) + 4); | |
358 | if (!skb) | |
359 | goto out; | |
360 | ||
361 | skb->protocol = htons(ETH_P_IP); | |
362 | ||
363 | skb_reset_mac_header(skb); | |
364 | eth = eth_hdr(skb); | |
365 | ||
e5a727f6 | 366 | ether_addr_copy(eth->h_source, br->dev->dev_addr); |
eb1d1641 HX |
367 | eth->h_dest[0] = 1; |
368 | eth->h_dest[1] = 0; | |
369 | eth->h_dest[2] = 0x5e; | |
370 | eth->h_dest[3] = 0; | |
371 | eth->h_dest[4] = 0; | |
372 | eth->h_dest[5] = 1; | |
373 | eth->h_proto = htons(ETH_P_IP); | |
374 | skb_put(skb, sizeof(*eth)); | |
375 | ||
376 | skb_set_network_header(skb, skb->len); | |
377 | iph = ip_hdr(skb); | |
378 | ||
379 | iph->version = 4; | |
380 | iph->ihl = 6; | |
381 | iph->tos = 0xc0; | |
382 | iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4); | |
383 | iph->id = 0; | |
384 | iph->frag_off = htons(IP_DF); | |
385 | iph->ttl = 1; | |
386 | iph->protocol = IPPROTO_IGMP; | |
1c8ad5bf CW |
387 | iph->saddr = br->multicast_query_use_ifaddr ? |
388 | inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0; | |
eb1d1641 HX |
389 | iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); |
390 | ((u8 *)&iph[1])[0] = IPOPT_RA; | |
391 | ((u8 *)&iph[1])[1] = 4; | |
392 | ((u8 *)&iph[1])[2] = 0; | |
393 | ((u8 *)&iph[1])[3] = 0; | |
394 | ip_send_check(iph); | |
395 | skb_put(skb, 24); | |
396 | ||
397 | skb_set_transport_header(skb, skb->len); | |
398 | ih = igmp_hdr(skb); | |
399 | ih->type = IGMP_HOST_MEMBERSHIP_QUERY; | |
400 | ih->code = (group ? br->multicast_last_member_interval : | |
401 | br->multicast_query_response_interval) / | |
402 | (HZ / IGMP_TIMER_SCALE); | |
403 | ih->group = group; | |
404 | ih->csum = 0; | |
405 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
406 | skb_put(skb, sizeof(*ih)); | |
407 | ||
408 | __skb_pull(skb, sizeof(*eth)); | |
409 | ||
410 | out: | |
411 | return skb; | |
412 | } | |
413 | ||
dfd56b8b | 414 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 415 | static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, |
b71d1d42 | 416 | const struct in6_addr *group) |
08b202b6 YH |
417 | { |
418 | struct sk_buff *skb; | |
419 | struct ipv6hdr *ip6h; | |
420 | struct mld_msg *mldq; | |
421 | struct ethhdr *eth; | |
422 | u8 *hopopt; | |
423 | unsigned long interval; | |
424 | ||
425 | skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) + | |
426 | 8 + sizeof(*mldq)); | |
427 | if (!skb) | |
428 | goto out; | |
429 | ||
430 | skb->protocol = htons(ETH_P_IPV6); | |
431 | ||
432 | /* Ethernet header */ | |
433 | skb_reset_mac_header(skb); | |
434 | eth = eth_hdr(skb); | |
435 | ||
e5a727f6 | 436 | ether_addr_copy(eth->h_source, br->dev->dev_addr); |
08b202b6 YH |
437 | eth->h_proto = htons(ETH_P_IPV6); |
438 | skb_put(skb, sizeof(*eth)); | |
439 | ||
440 | /* IPv6 header + HbH option */ | |
441 | skb_set_network_header(skb, skb->len); | |
442 | ip6h = ipv6_hdr(skb); | |
443 | ||
444 | *(__force __be32 *)ip6h = htonl(0x60000000); | |
76d66158 | 445 | ip6h->payload_len = htons(8 + sizeof(*mldq)); |
08b202b6 YH |
446 | ip6h->nexthdr = IPPROTO_HOPOPTS; |
447 | ip6h->hop_limit = 1; | |
a7bff75b | 448 | ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1)); |
d1d81d4c UW |
449 | if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0, |
450 | &ip6h->saddr)) { | |
451 | kfree_skb(skb); | |
452 | return NULL; | |
453 | } | |
36cff5a1 | 454 | ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); |
08b202b6 YH |
455 | |
456 | hopopt = (u8 *)(ip6h + 1); | |
457 | hopopt[0] = IPPROTO_ICMPV6; /* next hdr */ | |
458 | hopopt[1] = 0; /* length of HbH */ | |
459 | hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */ | |
460 | hopopt[3] = 2; /* Length of RA Option */ | |
461 | hopopt[4] = 0; /* Type = 0x0000 (MLD) */ | |
462 | hopopt[5] = 0; | |
1de5a71c EZ |
463 | hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */ |
464 | hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */ | |
08b202b6 YH |
465 | |
466 | skb_put(skb, sizeof(*ip6h) + 8); | |
467 | ||
468 | /* ICMPv6 */ | |
469 | skb_set_transport_header(skb, skb->len); | |
470 | mldq = (struct mld_msg *) icmp6_hdr(skb); | |
471 | ||
32de868c LL |
472 | interval = ipv6_addr_any(group) ? |
473 | br->multicast_query_response_interval : | |
474 | br->multicast_last_member_interval; | |
08b202b6 YH |
475 | |
476 | mldq->mld_type = ICMPV6_MGM_QUERY; | |
477 | mldq->mld_code = 0; | |
478 | mldq->mld_cksum = 0; | |
479 | mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); | |
480 | mldq->mld_reserved = 0; | |
4e3fd7a0 | 481 | mldq->mld_mca = *group; |
08b202b6 YH |
482 | |
483 | /* checksum */ | |
484 | mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
485 | sizeof(*mldq), IPPROTO_ICMPV6, | |
486 | csum_partial(mldq, | |
487 | sizeof(*mldq), 0)); | |
488 | skb_put(skb, sizeof(*mldq)); | |
489 | ||
490 | __skb_pull(skb, sizeof(*eth)); | |
491 | ||
492 | out: | |
493 | return skb; | |
494 | } | |
495 | #endif | |
496 | ||
8ef2a9a5 YH |
497 | static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, |
498 | struct br_ip *addr) | |
499 | { | |
500 | switch (addr->proto) { | |
501 | case htons(ETH_P_IP): | |
502 | return br_ip4_multicast_alloc_query(br, addr->u.ip4); | |
dfd56b8b | 503 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
504 | case htons(ETH_P_IPV6): |
505 | return br_ip6_multicast_alloc_query(br, &addr->u.ip6); | |
506 | #endif | |
8ef2a9a5 YH |
507 | } |
508 | return NULL; | |
509 | } | |
510 | ||
eb1d1641 | 511 | static struct net_bridge_mdb_entry *br_multicast_get_group( |
8ef2a9a5 YH |
512 | struct net_bridge *br, struct net_bridge_port *port, |
513 | struct br_ip *group, int hash) | |
eb1d1641 | 514 | { |
e8051688 | 515 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 | 516 | struct net_bridge_mdb_entry *mp; |
95c96174 ED |
517 | unsigned int count = 0; |
518 | unsigned int max; | |
eb1d1641 HX |
519 | int elasticity; |
520 | int err; | |
521 | ||
e8051688 | 522 | mdb = rcu_dereference_protected(br->mdb, 1); |
b67bfe0d | 523 | hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) { |
eb1d1641 | 524 | count++; |
8ef2a9a5 | 525 | if (unlikely(br_ip_equal(group, &mp->addr))) |
eb1d1641 | 526 | return mp; |
eb1d1641 HX |
527 | } |
528 | ||
529 | elasticity = 0; | |
530 | max = mdb->max; | |
531 | ||
532 | if (unlikely(count > br->hash_elasticity && count)) { | |
533 | if (net_ratelimit()) | |
28a16c97 | 534 | br_info(br, "Multicast hash table " |
535 | "chain limit reached: %s\n", | |
536 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
537 | |
538 | elasticity = br->hash_elasticity; | |
539 | } | |
540 | ||
541 | if (mdb->size >= max) { | |
542 | max *= 2; | |
036be6db TG |
543 | if (unlikely(max > br->hash_max)) { |
544 | br_warn(br, "Multicast hash table maximum of %d " | |
545 | "reached, disabling snooping: %s\n", | |
546 | br->hash_max, | |
547 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
548 | err = -E2BIG; |
549 | disable: | |
550 | br->multicast_disabled = 1; | |
551 | goto err; | |
552 | } | |
553 | } | |
554 | ||
555 | if (max > mdb->max || elasticity) { | |
556 | if (mdb->old) { | |
557 | if (net_ratelimit()) | |
28a16c97 | 558 | br_info(br, "Multicast hash table " |
559 | "on fire: %s\n", | |
560 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
561 | err = -EEXIST; |
562 | goto err; | |
563 | } | |
564 | ||
565 | err = br_mdb_rehash(&br->mdb, max, elasticity); | |
566 | if (err) { | |
28a16c97 | 567 | br_warn(br, "Cannot rehash multicast " |
568 | "hash table, disabling snooping: %s, %d, %d\n", | |
569 | port ? port->dev->name : br->dev->name, | |
570 | mdb->size, err); | |
eb1d1641 HX |
571 | goto disable; |
572 | } | |
573 | ||
574 | err = -EAGAIN; | |
575 | goto err; | |
576 | } | |
577 | ||
578 | return NULL; | |
579 | ||
580 | err: | |
581 | mp = ERR_PTR(err); | |
582 | return mp; | |
583 | } | |
584 | ||
cfd56754 CW |
585 | struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br, |
586 | struct net_bridge_port *port, struct br_ip *group) | |
eb1d1641 | 587 | { |
e8051688 | 588 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 HX |
589 | struct net_bridge_mdb_entry *mp; |
590 | int hash; | |
4c0833bc | 591 | int err; |
eb1d1641 | 592 | |
e8051688 | 593 | mdb = rcu_dereference_protected(br->mdb, 1); |
eb1d1641 | 594 | if (!mdb) { |
4c0833bc TK |
595 | err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0); |
596 | if (err) | |
597 | return ERR_PTR(err); | |
eb1d1641 HX |
598 | goto rehash; |
599 | } | |
600 | ||
601 | hash = br_ip_hash(mdb, group); | |
602 | mp = br_multicast_get_group(br, port, group, hash); | |
603 | switch (PTR_ERR(mp)) { | |
604 | case 0: | |
605 | break; | |
606 | ||
607 | case -EAGAIN: | |
608 | rehash: | |
e8051688 | 609 | mdb = rcu_dereference_protected(br->mdb, 1); |
eb1d1641 HX |
610 | hash = br_ip_hash(mdb, group); |
611 | break; | |
612 | ||
613 | default: | |
614 | goto out; | |
615 | } | |
616 | ||
617 | mp = kzalloc(sizeof(*mp), GFP_ATOMIC); | |
618 | if (unlikely(!mp)) | |
4c0833bc | 619 | return ERR_PTR(-ENOMEM); |
eb1d1641 HX |
620 | |
621 | mp->br = br; | |
8ef2a9a5 | 622 | mp->addr = *group; |
1faabf2a ED |
623 | setup_timer(&mp->timer, br_multicast_group_expired, |
624 | (unsigned long)mp); | |
625 | ||
eb1d1641 HX |
626 | hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]); |
627 | mdb->size++; | |
628 | ||
629 | out: | |
630 | return mp; | |
631 | } | |
632 | ||
cfd56754 CW |
633 | struct net_bridge_port_group *br_multicast_new_port_group( |
634 | struct net_bridge_port *port, | |
635 | struct br_ip *group, | |
ccb1c31a AW |
636 | struct net_bridge_port_group __rcu *next, |
637 | unsigned char state) | |
cfd56754 CW |
638 | { |
639 | struct net_bridge_port_group *p; | |
640 | ||
641 | p = kzalloc(sizeof(*p), GFP_ATOMIC); | |
642 | if (unlikely(!p)) | |
643 | return NULL; | |
644 | ||
645 | p->addr = *group; | |
646 | p->port = port; | |
ccb1c31a | 647 | p->state = state; |
eca2a43b | 648 | rcu_assign_pointer(p->next, next); |
cfd56754 CW |
649 | hlist_add_head(&p->mglist, &port->mglist); |
650 | setup_timer(&p->timer, br_multicast_port_group_expired, | |
651 | (unsigned long)p); | |
652 | return p; | |
653 | } | |
654 | ||
eb1d1641 | 655 | static int br_multicast_add_group(struct net_bridge *br, |
8ef2a9a5 YH |
656 | struct net_bridge_port *port, |
657 | struct br_ip *group) | |
eb1d1641 HX |
658 | { |
659 | struct net_bridge_mdb_entry *mp; | |
660 | struct net_bridge_port_group *p; | |
e8051688 | 661 | struct net_bridge_port_group __rcu **pp; |
454594f3 | 662 | unsigned long now = jiffies; |
eb1d1641 HX |
663 | int err; |
664 | ||
eb1d1641 HX |
665 | spin_lock(&br->multicast_lock); |
666 | if (!netif_running(br->dev) || | |
667 | (port && port->state == BR_STATE_DISABLED)) | |
668 | goto out; | |
669 | ||
670 | mp = br_multicast_new_group(br, port, group); | |
671 | err = PTR_ERR(mp); | |
4c0833bc | 672 | if (IS_ERR(mp)) |
eb1d1641 HX |
673 | goto err; |
674 | ||
675 | if (!port) { | |
8a870178 | 676 | mp->mglist = true; |
454594f3 | 677 | mod_timer(&mp->timer, now + br->multicast_membership_interval); |
eb1d1641 HX |
678 | goto out; |
679 | } | |
680 | ||
e8051688 ED |
681 | for (pp = &mp->ports; |
682 | (p = mlock_dereference(*pp, br)) != NULL; | |
683 | pp = &p->next) { | |
eb1d1641 | 684 | if (p->port == port) |
454594f3 | 685 | goto found; |
eb1d1641 HX |
686 | if ((unsigned long)p->port < (unsigned long)port) |
687 | break; | |
688 | } | |
689 | ||
ccb1c31a | 690 | p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY); |
eb1d1641 HX |
691 | if (unlikely(!p)) |
692 | goto err; | |
eb1d1641 | 693 | rcu_assign_pointer(*pp, p); |
37a393bc | 694 | br_mdb_notify(br->dev, port, group, RTM_NEWMDB); |
eb1d1641 | 695 | |
454594f3 LL |
696 | found: |
697 | mod_timer(&p->timer, now + br->multicast_membership_interval); | |
eb1d1641 HX |
698 | out: |
699 | err = 0; | |
700 | ||
701 | err: | |
702 | spin_unlock(&br->multicast_lock); | |
703 | return err; | |
704 | } | |
705 | ||
8ef2a9a5 YH |
706 | static int br_ip4_multicast_add_group(struct net_bridge *br, |
707 | struct net_bridge_port *port, | |
b0e9a30d VY |
708 | __be32 group, |
709 | __u16 vid) | |
8ef2a9a5 YH |
710 | { |
711 | struct br_ip br_group; | |
712 | ||
713 | if (ipv4_is_local_multicast(group)) | |
714 | return 0; | |
715 | ||
716 | br_group.u.ip4 = group; | |
717 | br_group.proto = htons(ETH_P_IP); | |
b0e9a30d | 718 | br_group.vid = vid; |
8ef2a9a5 YH |
719 | |
720 | return br_multicast_add_group(br, port, &br_group); | |
721 | } | |
722 | ||
dfd56b8b | 723 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
724 | static int br_ip6_multicast_add_group(struct net_bridge *br, |
725 | struct net_bridge_port *port, | |
b0e9a30d VY |
726 | const struct in6_addr *group, |
727 | __u16 vid) | |
08b202b6 YH |
728 | { |
729 | struct br_ip br_group; | |
730 | ||
3c3769e6 | 731 | if (ipv6_addr_is_ll_all_nodes(group)) |
08b202b6 YH |
732 | return 0; |
733 | ||
4e3fd7a0 | 734 | br_group.u.ip6 = *group; |
9cc6e0c4 | 735 | br_group.proto = htons(ETH_P_IPV6); |
b0e9a30d | 736 | br_group.vid = vid; |
08b202b6 YH |
737 | |
738 | return br_multicast_add_group(br, port, &br_group); | |
739 | } | |
740 | #endif | |
741 | ||
eb1d1641 HX |
742 | static void br_multicast_router_expired(unsigned long data) |
743 | { | |
744 | struct net_bridge_port *port = (void *)data; | |
745 | struct net_bridge *br = port->br; | |
746 | ||
747 | spin_lock(&br->multicast_lock); | |
748 | if (port->multicast_router != 1 || | |
749 | timer_pending(&port->multicast_router_timer) || | |
750 | hlist_unhashed(&port->rlist)) | |
751 | goto out; | |
752 | ||
753 | hlist_del_init_rcu(&port->rlist); | |
754 | ||
755 | out: | |
756 | spin_unlock(&br->multicast_lock); | |
757 | } | |
758 | ||
759 | static void br_multicast_local_router_expired(unsigned long data) | |
760 | { | |
761 | } | |
762 | ||
cc0fdd80 | 763 | static void br_multicast_querier_expired(struct net_bridge *br, |
90010b36 | 764 | struct bridge_mcast_own_query *query) |
c83b8fab | 765 | { |
c83b8fab HX |
766 | spin_lock(&br->multicast_lock); |
767 | if (!netif_running(br->dev) || br->multicast_disabled) | |
768 | goto out; | |
769 | ||
cc0fdd80 | 770 | br_multicast_start_querier(br, query); |
c83b8fab HX |
771 | |
772 | out: | |
773 | spin_unlock(&br->multicast_lock); | |
774 | } | |
775 | ||
cc0fdd80 LL |
776 | static void br_ip4_multicast_querier_expired(unsigned long data) |
777 | { | |
778 | struct net_bridge *br = (void *)data; | |
779 | ||
90010b36 | 780 | br_multicast_querier_expired(br, &br->ip4_own_query); |
cc0fdd80 LL |
781 | } |
782 | ||
783 | #if IS_ENABLED(CONFIG_IPV6) | |
784 | static void br_ip6_multicast_querier_expired(unsigned long data) | |
785 | { | |
786 | struct net_bridge *br = (void *)data; | |
787 | ||
90010b36 | 788 | br_multicast_querier_expired(br, &br->ip6_own_query); |
cc0fdd80 LL |
789 | } |
790 | #endif | |
791 | ||
8ef2a9a5 YH |
792 | static void __br_multicast_send_query(struct net_bridge *br, |
793 | struct net_bridge_port *port, | |
794 | struct br_ip *ip) | |
eb1d1641 | 795 | { |
eb1d1641 HX |
796 | struct sk_buff *skb; |
797 | ||
8ef2a9a5 | 798 | skb = br_multicast_alloc_query(br, ip); |
eb1d1641 | 799 | if (!skb) |
8ef2a9a5 | 800 | return; |
eb1d1641 HX |
801 | |
802 | if (port) { | |
803 | __skb_push(skb, sizeof(struct ethhdr)); | |
804 | skb->dev = port->dev; | |
713aefa3 | 805 | NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, |
eb1d1641 HX |
806 | dev_queue_xmit); |
807 | } else | |
808 | netif_rx(skb); | |
8ef2a9a5 YH |
809 | } |
810 | ||
811 | static void br_multicast_send_query(struct net_bridge *br, | |
cc0fdd80 | 812 | struct net_bridge_port *port, |
90010b36 | 813 | struct bridge_mcast_own_query *own_query) |
8ef2a9a5 YH |
814 | { |
815 | unsigned long time; | |
816 | struct br_ip br_group; | |
90010b36 | 817 | struct bridge_mcast_other_query *other_query = NULL; |
8ef2a9a5 YH |
818 | |
819 | if (!netif_running(br->dev) || br->multicast_disabled || | |
cc0fdd80 | 820 | !br->multicast_querier) |
8ef2a9a5 YH |
821 | return; |
822 | ||
08b202b6 YH |
823 | memset(&br_group.u, 0, sizeof(br_group.u)); |
824 | ||
90010b36 LL |
825 | if (port ? (own_query == &port->ip4_own_query) : |
826 | (own_query == &br->ip4_own_query)) { | |
827 | other_query = &br->ip4_other_query; | |
cc0fdd80 | 828 | br_group.proto = htons(ETH_P_IP); |
dfd56b8b | 829 | #if IS_ENABLED(CONFIG_IPV6) |
cc0fdd80 | 830 | } else { |
90010b36 | 831 | other_query = &br->ip6_other_query; |
cc0fdd80 | 832 | br_group.proto = htons(ETH_P_IPV6); |
08b202b6 | 833 | #endif |
cc0fdd80 LL |
834 | } |
835 | ||
90010b36 | 836 | if (!other_query || timer_pending(&other_query->timer)) |
cc0fdd80 LL |
837 | return; |
838 | ||
839 | __br_multicast_send_query(br, port, &br_group); | |
eb1d1641 | 840 | |
eb1d1641 | 841 | time = jiffies; |
90010b36 | 842 | time += own_query->startup_sent < br->multicast_startup_query_count ? |
eb1d1641 HX |
843 | br->multicast_startup_query_interval : |
844 | br->multicast_query_interval; | |
90010b36 | 845 | mod_timer(&own_query->timer, time); |
eb1d1641 HX |
846 | } |
847 | ||
90010b36 LL |
848 | static void |
849 | br_multicast_port_query_expired(struct net_bridge_port *port, | |
850 | struct bridge_mcast_own_query *query) | |
eb1d1641 | 851 | { |
eb1d1641 HX |
852 | struct net_bridge *br = port->br; |
853 | ||
854 | spin_lock(&br->multicast_lock); | |
02a780c0 DC |
855 | if (port->state == BR_STATE_DISABLED || |
856 | port->state == BR_STATE_BLOCKING) | |
eb1d1641 HX |
857 | goto out; |
858 | ||
cc0fdd80 LL |
859 | if (query->startup_sent < br->multicast_startup_query_count) |
860 | query->startup_sent++; | |
eb1d1641 | 861 | |
cc0fdd80 | 862 | br_multicast_send_query(port->br, port, query); |
eb1d1641 HX |
863 | |
864 | out: | |
865 | spin_unlock(&br->multicast_lock); | |
866 | } | |
867 | ||
cc0fdd80 LL |
868 | static void br_ip4_multicast_port_query_expired(unsigned long data) |
869 | { | |
870 | struct net_bridge_port *port = (void *)data; | |
871 | ||
90010b36 | 872 | br_multicast_port_query_expired(port, &port->ip4_own_query); |
cc0fdd80 LL |
873 | } |
874 | ||
875 | #if IS_ENABLED(CONFIG_IPV6) | |
876 | static void br_ip6_multicast_port_query_expired(unsigned long data) | |
877 | { | |
878 | struct net_bridge_port *port = (void *)data; | |
879 | ||
90010b36 | 880 | br_multicast_port_query_expired(port, &port->ip6_own_query); |
cc0fdd80 LL |
881 | } |
882 | #endif | |
883 | ||
eb1d1641 HX |
884 | void br_multicast_add_port(struct net_bridge_port *port) |
885 | { | |
886 | port->multicast_router = 1; | |
887 | ||
888 | setup_timer(&port->multicast_router_timer, br_multicast_router_expired, | |
889 | (unsigned long)port); | |
90010b36 LL |
890 | setup_timer(&port->ip4_own_query.timer, |
891 | br_ip4_multicast_port_query_expired, (unsigned long)port); | |
cc0fdd80 | 892 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 LL |
893 | setup_timer(&port->ip6_own_query.timer, |
894 | br_ip6_multicast_port_query_expired, (unsigned long)port); | |
cc0fdd80 | 895 | #endif |
eb1d1641 HX |
896 | } |
897 | ||
898 | void br_multicast_del_port(struct net_bridge_port *port) | |
899 | { | |
900 | del_timer_sync(&port->multicast_router_timer); | |
901 | } | |
902 | ||
90010b36 | 903 | static void br_multicast_enable(struct bridge_mcast_own_query *query) |
561f1103 | 904 | { |
cc0fdd80 | 905 | query->startup_sent = 0; |
561f1103 | 906 | |
cc0fdd80 LL |
907 | if (try_to_del_timer_sync(&query->timer) >= 0 || |
908 | del_timer(&query->timer)) | |
909 | mod_timer(&query->timer, jiffies); | |
561f1103 HX |
910 | } |
911 | ||
eb1d1641 HX |
912 | void br_multicast_enable_port(struct net_bridge_port *port) |
913 | { | |
914 | struct net_bridge *br = port->br; | |
915 | ||
916 | spin_lock(&br->multicast_lock); | |
917 | if (br->multicast_disabled || !netif_running(br->dev)) | |
918 | goto out; | |
919 | ||
90010b36 | 920 | br_multicast_enable(&port->ip4_own_query); |
cc0fdd80 | 921 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 | 922 | br_multicast_enable(&port->ip6_own_query); |
cc0fdd80 | 923 | #endif |
eb1d1641 HX |
924 | |
925 | out: | |
926 | spin_unlock(&br->multicast_lock); | |
927 | } | |
928 | ||
929 | void br_multicast_disable_port(struct net_bridge_port *port) | |
930 | { | |
931 | struct net_bridge *br = port->br; | |
932 | struct net_bridge_port_group *pg; | |
b67bfe0d | 933 | struct hlist_node *n; |
eb1d1641 HX |
934 | |
935 | spin_lock(&br->multicast_lock); | |
b67bfe0d | 936 | hlist_for_each_entry_safe(pg, n, &port->mglist, mglist) |
eb1d1641 HX |
937 | br_multicast_del_pg(br, pg); |
938 | ||
939 | if (!hlist_unhashed(&port->rlist)) | |
940 | hlist_del_init_rcu(&port->rlist); | |
941 | del_timer(&port->multicast_router_timer); | |
90010b36 | 942 | del_timer(&port->ip4_own_query.timer); |
cc0fdd80 | 943 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 | 944 | del_timer(&port->ip6_own_query.timer); |
cc0fdd80 | 945 | #endif |
eb1d1641 HX |
946 | spin_unlock(&br->multicast_lock); |
947 | } | |
948 | ||
8ef2a9a5 YH |
949 | static int br_ip4_multicast_igmp3_report(struct net_bridge *br, |
950 | struct net_bridge_port *port, | |
06499098 VY |
951 | struct sk_buff *skb, |
952 | u16 vid) | |
eb1d1641 HX |
953 | { |
954 | struct igmpv3_report *ih; | |
955 | struct igmpv3_grec *grec; | |
956 | int i; | |
957 | int len; | |
958 | int num; | |
959 | int type; | |
960 | int err = 0; | |
961 | __be32 group; | |
962 | ||
963 | if (!pskb_may_pull(skb, sizeof(*ih))) | |
964 | return -EINVAL; | |
965 | ||
966 | ih = igmpv3_report_hdr(skb); | |
967 | num = ntohs(ih->ngrec); | |
968 | len = sizeof(*ih); | |
969 | ||
970 | for (i = 0; i < num; i++) { | |
971 | len += sizeof(*grec); | |
972 | if (!pskb_may_pull(skb, len)) | |
973 | return -EINVAL; | |
974 | ||
fd218cf9 | 975 | grec = (void *)(skb->data + len - sizeof(*grec)); |
eb1d1641 HX |
976 | group = grec->grec_mca; |
977 | type = grec->grec_type; | |
978 | ||
8eabf95c | 979 | len += ntohs(grec->grec_nsrcs) * 4; |
eb1d1641 HX |
980 | if (!pskb_may_pull(skb, len)) |
981 | return -EINVAL; | |
982 | ||
983 | /* We treat this as an IGMPv2 report for now. */ | |
984 | switch (type) { | |
985 | case IGMPV3_MODE_IS_INCLUDE: | |
986 | case IGMPV3_MODE_IS_EXCLUDE: | |
987 | case IGMPV3_CHANGE_TO_INCLUDE: | |
988 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
989 | case IGMPV3_ALLOW_NEW_SOURCES: | |
990 | case IGMPV3_BLOCK_OLD_SOURCES: | |
991 | break; | |
992 | ||
993 | default: | |
994 | continue; | |
995 | } | |
996 | ||
b0e9a30d | 997 | err = br_ip4_multicast_add_group(br, port, group, vid); |
eb1d1641 HX |
998 | if (err) |
999 | break; | |
1000 | } | |
1001 | ||
1002 | return err; | |
1003 | } | |
1004 | ||
dfd56b8b | 1005 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1006 | static int br_ip6_multicast_mld2_report(struct net_bridge *br, |
1007 | struct net_bridge_port *port, | |
06499098 VY |
1008 | struct sk_buff *skb, |
1009 | u16 vid) | |
08b202b6 YH |
1010 | { |
1011 | struct icmp6hdr *icmp6h; | |
1012 | struct mld2_grec *grec; | |
1013 | int i; | |
1014 | int len; | |
1015 | int num; | |
1016 | int err = 0; | |
1017 | ||
1018 | if (!pskb_may_pull(skb, sizeof(*icmp6h))) | |
1019 | return -EINVAL; | |
1020 | ||
1021 | icmp6h = icmp6_hdr(skb); | |
1022 | num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); | |
1023 | len = sizeof(*icmp6h); | |
1024 | ||
1025 | for (i = 0; i < num; i++) { | |
1026 | __be16 *nsrcs, _nsrcs; | |
1027 | ||
1028 | nsrcs = skb_header_pointer(skb, | |
1029 | len + offsetof(struct mld2_grec, | |
649e984d | 1030 | grec_nsrcs), |
08b202b6 YH |
1031 | sizeof(_nsrcs), &_nsrcs); |
1032 | if (!nsrcs) | |
1033 | return -EINVAL; | |
1034 | ||
1035 | if (!pskb_may_pull(skb, | |
1036 | len + sizeof(*grec) + | |
d41db9f3 | 1037 | sizeof(struct in6_addr) * ntohs(*nsrcs))) |
08b202b6 YH |
1038 | return -EINVAL; |
1039 | ||
1040 | grec = (struct mld2_grec *)(skb->data + len); | |
d41db9f3 LL |
1041 | len += sizeof(*grec) + |
1042 | sizeof(struct in6_addr) * ntohs(*nsrcs); | |
08b202b6 YH |
1043 | |
1044 | /* We treat these as MLDv1 reports for now. */ | |
1045 | switch (grec->grec_type) { | |
1046 | case MLD2_MODE_IS_INCLUDE: | |
1047 | case MLD2_MODE_IS_EXCLUDE: | |
1048 | case MLD2_CHANGE_TO_INCLUDE: | |
1049 | case MLD2_CHANGE_TO_EXCLUDE: | |
1050 | case MLD2_ALLOW_NEW_SOURCES: | |
1051 | case MLD2_BLOCK_OLD_SOURCES: | |
1052 | break; | |
1053 | ||
1054 | default: | |
1055 | continue; | |
1056 | } | |
1057 | ||
b0e9a30d VY |
1058 | err = br_ip6_multicast_add_group(br, port, &grec->grec_mca, |
1059 | vid); | |
08b202b6 YH |
1060 | if (!err) |
1061 | break; | |
1062 | } | |
1063 | ||
1064 | return err; | |
1065 | } | |
1066 | #endif | |
1067 | ||
cc0fdd80 | 1068 | static void |
90010b36 LL |
1069 | br_multicast_update_query_timer(struct net_bridge *br, |
1070 | struct bridge_mcast_other_query *query, | |
1071 | unsigned long max_delay) | |
b00589af | 1072 | { |
90010b36 LL |
1073 | if (!timer_pending(&query->timer)) |
1074 | query->delay_time = jiffies + max_delay; | |
b00589af | 1075 | |
90010b36 | 1076 | mod_timer(&query->timer, jiffies + br->multicast_querier_interval); |
b00589af LL |
1077 | } |
1078 | ||
7e80c124 | 1079 | /* |
7c77602f | 1080 | * Add port to router_list |
7e80c124 | 1081 | * list is maintained ordered by pointer value |
1082 | * and locked by br->multicast_lock and RCU | |
1083 | */ | |
0909e117 HX |
1084 | static void br_multicast_add_router(struct net_bridge *br, |
1085 | struct net_bridge_port *port) | |
1086 | { | |
dcdca2c4 | 1087 | struct net_bridge_port *p; |
b67bfe0d | 1088 | struct hlist_node *slot = NULL; |
dcdca2c4 | 1089 | |
b67bfe0d | 1090 | hlist_for_each_entry(p, &br->router_list, rlist) { |
7e80c124 | 1091 | if ((unsigned long) port >= (unsigned long) p) |
1092 | break; | |
b67bfe0d | 1093 | slot = &p->rlist; |
dcdca2c4 | 1094 | } |
1095 | ||
7e80c124 | 1096 | if (slot) |
1097 | hlist_add_after_rcu(slot, &port->rlist); | |
dcdca2c4 | 1098 | else |
1099 | hlist_add_head_rcu(&port->rlist, &br->router_list); | |
0909e117 HX |
1100 | } |
1101 | ||
eb1d1641 HX |
1102 | static void br_multicast_mark_router(struct net_bridge *br, |
1103 | struct net_bridge_port *port) | |
1104 | { | |
1105 | unsigned long now = jiffies; | |
eb1d1641 HX |
1106 | |
1107 | if (!port) { | |
1108 | if (br->multicast_router == 1) | |
1109 | mod_timer(&br->multicast_router_timer, | |
1110 | now + br->multicast_querier_interval); | |
1111 | return; | |
1112 | } | |
1113 | ||
1114 | if (port->multicast_router != 1) | |
1115 | return; | |
1116 | ||
1117 | if (!hlist_unhashed(&port->rlist)) | |
1118 | goto timer; | |
1119 | ||
0909e117 | 1120 | br_multicast_add_router(br, port); |
eb1d1641 HX |
1121 | |
1122 | timer: | |
1123 | mod_timer(&port->multicast_router_timer, | |
1124 | now + br->multicast_querier_interval); | |
1125 | } | |
1126 | ||
1127 | static void br_multicast_query_received(struct net_bridge *br, | |
1128 | struct net_bridge_port *port, | |
90010b36 | 1129 | struct bridge_mcast_other_query *query, |
b00589af | 1130 | int saddr, |
20a599be | 1131 | bool is_general_query, |
b00589af | 1132 | unsigned long max_delay) |
eb1d1641 | 1133 | { |
20a599be | 1134 | if (saddr && is_general_query) |
90010b36 LL |
1135 | br_multicast_update_query_timer(br, query, max_delay); |
1136 | else if (timer_pending(&query->timer)) | |
eb1d1641 HX |
1137 | return; |
1138 | ||
1139 | br_multicast_mark_router(br, port); | |
1140 | } | |
1141 | ||
8ef2a9a5 YH |
1142 | static int br_ip4_multicast_query(struct net_bridge *br, |
1143 | struct net_bridge_port *port, | |
06499098 VY |
1144 | struct sk_buff *skb, |
1145 | u16 vid) | |
eb1d1641 | 1146 | { |
b71d1d42 | 1147 | const struct iphdr *iph = ip_hdr(skb); |
eb1d1641 HX |
1148 | struct igmphdr *ih = igmp_hdr(skb); |
1149 | struct net_bridge_mdb_entry *mp; | |
1150 | struct igmpv3_query *ih3; | |
1151 | struct net_bridge_port_group *p; | |
e8051688 | 1152 | struct net_bridge_port_group __rcu **pp; |
eb1d1641 HX |
1153 | unsigned long max_delay; |
1154 | unsigned long now = jiffies; | |
1155 | __be32 group; | |
bec68ff1 | 1156 | int err = 0; |
eb1d1641 HX |
1157 | |
1158 | spin_lock(&br->multicast_lock); | |
1159 | if (!netif_running(br->dev) || | |
1160 | (port && port->state == BR_STATE_DISABLED)) | |
1161 | goto out; | |
1162 | ||
eb1d1641 HX |
1163 | group = ih->group; |
1164 | ||
1165 | if (skb->len == sizeof(*ih)) { | |
1166 | max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); | |
1167 | ||
1168 | if (!max_delay) { | |
1169 | max_delay = 10 * HZ; | |
1170 | group = 0; | |
1171 | } | |
1172 | } else { | |
bec68ff1 YH |
1173 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) { |
1174 | err = -EINVAL; | |
1175 | goto out; | |
1176 | } | |
eb1d1641 HX |
1177 | |
1178 | ih3 = igmpv3_query_hdr(skb); | |
1179 | if (ih3->nsrcs) | |
bec68ff1 | 1180 | goto out; |
eb1d1641 | 1181 | |
0ba8c9ec YH |
1182 | max_delay = ih3->code ? |
1183 | IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; | |
eb1d1641 HX |
1184 | } |
1185 | ||
9ed973cc LL |
1186 | /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer |
1187 | * all-systems destination addresses (224.0.0.1) for general queries | |
1188 | */ | |
1189 | if (!group && iph->daddr != htonl(INADDR_ALLHOSTS_GROUP)) { | |
1190 | err = -EINVAL; | |
1191 | goto out; | |
1192 | } | |
1193 | ||
90010b36 LL |
1194 | br_multicast_query_received(br, port, &br->ip4_other_query, |
1195 | !!iph->saddr, !group, max_delay); | |
b00589af | 1196 | |
eb1d1641 HX |
1197 | if (!group) |
1198 | goto out; | |
1199 | ||
b0e9a30d | 1200 | mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid); |
eb1d1641 HX |
1201 | if (!mp) |
1202 | goto out; | |
1203 | ||
1204 | max_delay *= br->multicast_last_member_count; | |
1205 | ||
8a870178 | 1206 | if (mp->mglist && |
eb1d1641 HX |
1207 | (timer_pending(&mp->timer) ? |
1208 | time_after(mp->timer.expires, now + max_delay) : | |
1209 | try_to_del_timer_sync(&mp->timer) >= 0)) | |
1210 | mod_timer(&mp->timer, now + max_delay); | |
1211 | ||
e8051688 ED |
1212 | for (pp = &mp->ports; |
1213 | (p = mlock_dereference(*pp, br)) != NULL; | |
1214 | pp = &p->next) { | |
eb1d1641 HX |
1215 | if (timer_pending(&p->timer) ? |
1216 | time_after(p->timer.expires, now + max_delay) : | |
1217 | try_to_del_timer_sync(&p->timer) >= 0) | |
24f9cdcb | 1218 | mod_timer(&p->timer, now + max_delay); |
eb1d1641 HX |
1219 | } |
1220 | ||
1221 | out: | |
1222 | spin_unlock(&br->multicast_lock); | |
bec68ff1 | 1223 | return err; |
eb1d1641 HX |
1224 | } |
1225 | ||
dfd56b8b | 1226 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1227 | static int br_ip6_multicast_query(struct net_bridge *br, |
1228 | struct net_bridge_port *port, | |
06499098 VY |
1229 | struct sk_buff *skb, |
1230 | u16 vid) | |
08b202b6 | 1231 | { |
b71d1d42 | 1232 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
eca2a43b | 1233 | struct mld_msg *mld; |
08b202b6 YH |
1234 | struct net_bridge_mdb_entry *mp; |
1235 | struct mld2_query *mld2q; | |
e8051688 ED |
1236 | struct net_bridge_port_group *p; |
1237 | struct net_bridge_port_group __rcu **pp; | |
08b202b6 YH |
1238 | unsigned long max_delay; |
1239 | unsigned long now = jiffies; | |
b71d1d42 | 1240 | const struct in6_addr *group = NULL; |
9ed973cc | 1241 | bool is_general_query; |
08b202b6 YH |
1242 | int err = 0; |
1243 | ||
1244 | spin_lock(&br->multicast_lock); | |
1245 | if (!netif_running(br->dev) || | |
1246 | (port && port->state == BR_STATE_DISABLED)) | |
1247 | goto out; | |
1248 | ||
6565b9ee LL |
1249 | /* RFC2710+RFC3810 (MLDv1+MLDv2) require link-local source addresses */ |
1250 | if (!(ipv6_addr_type(&ip6h->saddr) & IPV6_ADDR_LINKLOCAL)) { | |
1251 | err = -EINVAL; | |
1252 | goto out; | |
1253 | } | |
1254 | ||
08b202b6 YH |
1255 | if (skb->len == sizeof(*mld)) { |
1256 | if (!pskb_may_pull(skb, sizeof(*mld))) { | |
1257 | err = -EINVAL; | |
1258 | goto out; | |
1259 | } | |
1260 | mld = (struct mld_msg *) icmp6_hdr(skb); | |
4715213d | 1261 | max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay)); |
08b202b6 YH |
1262 | if (max_delay) |
1263 | group = &mld->mld_mca; | |
248ba8ec | 1264 | } else { |
08b202b6 YH |
1265 | if (!pskb_may_pull(skb, sizeof(*mld2q))) { |
1266 | err = -EINVAL; | |
1267 | goto out; | |
1268 | } | |
1269 | mld2q = (struct mld2_query *)icmp6_hdr(skb); | |
1270 | if (!mld2q->mld2q_nsrcs) | |
1271 | group = &mld2q->mld2q_mca; | |
e3f5b170 DB |
1272 | |
1273 | max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL); | |
08b202b6 YH |
1274 | } |
1275 | ||
9ed973cc LL |
1276 | is_general_query = group && ipv6_addr_any(group); |
1277 | ||
1278 | /* RFC2710+RFC3810 (MLDv1+MLDv2) require the multicast link layer | |
1279 | * all-nodes destination address (ff02::1) for general queries | |
1280 | */ | |
1281 | if (is_general_query && !ipv6_addr_is_ll_all_nodes(&ip6h->daddr)) { | |
1282 | err = -EINVAL; | |
1283 | goto out; | |
1284 | } | |
1285 | ||
90010b36 | 1286 | br_multicast_query_received(br, port, &br->ip6_other_query, |
20a599be LL |
1287 | !ipv6_addr_any(&ip6h->saddr), |
1288 | is_general_query, max_delay); | |
b00589af | 1289 | |
08b202b6 YH |
1290 | if (!group) |
1291 | goto out; | |
1292 | ||
b0e9a30d | 1293 | mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid); |
08b202b6 YH |
1294 | if (!mp) |
1295 | goto out; | |
1296 | ||
1297 | max_delay *= br->multicast_last_member_count; | |
8a870178 | 1298 | if (mp->mglist && |
08b202b6 YH |
1299 | (timer_pending(&mp->timer) ? |
1300 | time_after(mp->timer.expires, now + max_delay) : | |
1301 | try_to_del_timer_sync(&mp->timer) >= 0)) | |
1302 | mod_timer(&mp->timer, now + max_delay); | |
1303 | ||
e8051688 ED |
1304 | for (pp = &mp->ports; |
1305 | (p = mlock_dereference(*pp, br)) != NULL; | |
1306 | pp = &p->next) { | |
08b202b6 YH |
1307 | if (timer_pending(&p->timer) ? |
1308 | time_after(p->timer.expires, now + max_delay) : | |
1309 | try_to_del_timer_sync(&p->timer) >= 0) | |
24f9cdcb | 1310 | mod_timer(&p->timer, now + max_delay); |
08b202b6 YH |
1311 | } |
1312 | ||
1313 | out: | |
1314 | spin_unlock(&br->multicast_lock); | |
1315 | return err; | |
1316 | } | |
1317 | #endif | |
1318 | ||
90010b36 LL |
1319 | static void |
1320 | br_multicast_leave_group(struct net_bridge *br, | |
1321 | struct net_bridge_port *port, | |
1322 | struct br_ip *group, | |
1323 | struct bridge_mcast_other_query *other_query, | |
1324 | struct bridge_mcast_own_query *own_query) | |
eb1d1641 HX |
1325 | { |
1326 | struct net_bridge_mdb_htable *mdb; | |
1327 | struct net_bridge_mdb_entry *mp; | |
1328 | struct net_bridge_port_group *p; | |
1329 | unsigned long now; | |
1330 | unsigned long time; | |
1331 | ||
eb1d1641 HX |
1332 | spin_lock(&br->multicast_lock); |
1333 | if (!netif_running(br->dev) || | |
1334 | (port && port->state == BR_STATE_DISABLED) || | |
90010b36 | 1335 | timer_pending(&other_query->timer)) |
eb1d1641 HX |
1336 | goto out; |
1337 | ||
e8051688 | 1338 | mdb = mlock_dereference(br->mdb, br); |
eb1d1641 HX |
1339 | mp = br_mdb_ip_get(mdb, group); |
1340 | if (!mp) | |
1341 | goto out; | |
1342 | ||
cc0fdd80 | 1343 | if (br->multicast_querier) { |
6b7df111 CW |
1344 | __br_multicast_send_query(br, port, &mp->addr); |
1345 | ||
1346 | time = jiffies + br->multicast_last_member_count * | |
1347 | br->multicast_last_member_interval; | |
cc0fdd80 | 1348 | |
90010b36 | 1349 | mod_timer(&own_query->timer, time); |
6b7df111 CW |
1350 | |
1351 | for (p = mlock_dereference(mp->ports, br); | |
1352 | p != NULL; | |
1353 | p = mlock_dereference(p->next, br)) { | |
1354 | if (p->port != port) | |
1355 | continue; | |
1356 | ||
1357 | if (!hlist_unhashed(&p->mglist) && | |
1358 | (timer_pending(&p->timer) ? | |
1359 | time_after(p->timer.expires, time) : | |
1360 | try_to_del_timer_sync(&p->timer) >= 0)) { | |
1361 | mod_timer(&p->timer, time); | |
1362 | } | |
1363 | ||
1364 | break; | |
1365 | } | |
1366 | } | |
1367 | ||
c2d3babf | 1368 | if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) { |
50426b59 AW |
1369 | struct net_bridge_port_group __rcu **pp; |
1370 | ||
1371 | for (pp = &mp->ports; | |
1372 | (p = mlock_dereference(*pp, br)) != NULL; | |
1373 | pp = &p->next) { | |
1374 | if (p->port != port) | |
1375 | continue; | |
1376 | ||
1377 | rcu_assign_pointer(*pp, p->next); | |
1378 | hlist_del_init(&p->mglist); | |
1379 | del_timer(&p->timer); | |
1380 | call_rcu_bh(&p->rcu, br_multicast_free_pg); | |
37a393bc | 1381 | br_mdb_notify(br->dev, port, group, RTM_DELMDB); |
50426b59 | 1382 | |
454594f3 | 1383 | if (!mp->ports && !mp->mglist && |
50426b59 AW |
1384 | netif_running(br->dev)) |
1385 | mod_timer(&mp->timer, jiffies); | |
1386 | } | |
1387 | goto out; | |
1388 | } | |
1389 | ||
eb1d1641 HX |
1390 | now = jiffies; |
1391 | time = now + br->multicast_last_member_count * | |
1392 | br->multicast_last_member_interval; | |
1393 | ||
1394 | if (!port) { | |
454594f3 | 1395 | if (mp->mglist && |
eb1d1641 HX |
1396 | (timer_pending(&mp->timer) ? |
1397 | time_after(mp->timer.expires, time) : | |
1398 | try_to_del_timer_sync(&mp->timer) >= 0)) { | |
1399 | mod_timer(&mp->timer, time); | |
eb1d1641 | 1400 | } |
454594f3 LL |
1401 | |
1402 | goto out; | |
1403 | } | |
1404 | ||
1405 | for (p = mlock_dereference(mp->ports, br); | |
1406 | p != NULL; | |
1407 | p = mlock_dereference(p->next, br)) { | |
1408 | if (p->port != port) | |
1409 | continue; | |
1410 | ||
1411 | if (!hlist_unhashed(&p->mglist) && | |
1412 | (timer_pending(&p->timer) ? | |
1413 | time_after(p->timer.expires, time) : | |
1414 | try_to_del_timer_sync(&p->timer) >= 0)) { | |
1415 | mod_timer(&p->timer, time); | |
1416 | } | |
1417 | ||
1418 | break; | |
eb1d1641 | 1419 | } |
eb1d1641 HX |
1420 | out: |
1421 | spin_unlock(&br->multicast_lock); | |
1422 | } | |
1423 | ||
8ef2a9a5 YH |
1424 | static void br_ip4_multicast_leave_group(struct net_bridge *br, |
1425 | struct net_bridge_port *port, | |
b0e9a30d VY |
1426 | __be32 group, |
1427 | __u16 vid) | |
8ef2a9a5 YH |
1428 | { |
1429 | struct br_ip br_group; | |
90010b36 | 1430 | struct bridge_mcast_own_query *own_query; |
8ef2a9a5 YH |
1431 | |
1432 | if (ipv4_is_local_multicast(group)) | |
1433 | return; | |
1434 | ||
90010b36 LL |
1435 | own_query = port ? &port->ip4_own_query : &br->ip4_own_query; |
1436 | ||
8ef2a9a5 YH |
1437 | br_group.u.ip4 = group; |
1438 | br_group.proto = htons(ETH_P_IP); | |
b0e9a30d | 1439 | br_group.vid = vid; |
8ef2a9a5 | 1440 | |
90010b36 LL |
1441 | br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query, |
1442 | own_query); | |
8ef2a9a5 YH |
1443 | } |
1444 | ||
dfd56b8b | 1445 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1446 | static void br_ip6_multicast_leave_group(struct net_bridge *br, |
1447 | struct net_bridge_port *port, | |
b0e9a30d VY |
1448 | const struct in6_addr *group, |
1449 | __u16 vid) | |
08b202b6 YH |
1450 | { |
1451 | struct br_ip br_group; | |
90010b36 | 1452 | struct bridge_mcast_own_query *own_query; |
08b202b6 | 1453 | |
3c3769e6 | 1454 | if (ipv6_addr_is_ll_all_nodes(group)) |
08b202b6 YH |
1455 | return; |
1456 | ||
90010b36 LL |
1457 | own_query = port ? &port->ip6_own_query : &br->ip6_own_query; |
1458 | ||
4e3fd7a0 | 1459 | br_group.u.ip6 = *group; |
08b202b6 | 1460 | br_group.proto = htons(ETH_P_IPV6); |
b0e9a30d | 1461 | br_group.vid = vid; |
08b202b6 | 1462 | |
90010b36 LL |
1463 | br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query, |
1464 | own_query); | |
08b202b6 YH |
1465 | } |
1466 | #endif | |
8ef2a9a5 | 1467 | |
eb1d1641 HX |
1468 | static int br_multicast_ipv4_rcv(struct net_bridge *br, |
1469 | struct net_bridge_port *port, | |
06499098 VY |
1470 | struct sk_buff *skb, |
1471 | u16 vid) | |
eb1d1641 HX |
1472 | { |
1473 | struct sk_buff *skb2 = skb; | |
b71d1d42 | 1474 | const struct iphdr *iph; |
eb1d1641 | 1475 | struct igmphdr *ih; |
95c96174 ED |
1476 | unsigned int len; |
1477 | unsigned int offset; | |
eb1d1641 HX |
1478 | int err; |
1479 | ||
eb1d1641 HX |
1480 | /* We treat OOM as packet loss for now. */ |
1481 | if (!pskb_may_pull(skb, sizeof(*iph))) | |
1482 | return -EINVAL; | |
1483 | ||
1484 | iph = ip_hdr(skb); | |
1485 | ||
1486 | if (iph->ihl < 5 || iph->version != 4) | |
1487 | return -EINVAL; | |
1488 | ||
1489 | if (!pskb_may_pull(skb, ip_hdrlen(skb))) | |
1490 | return -EINVAL; | |
1491 | ||
1492 | iph = ip_hdr(skb); | |
1493 | ||
1494 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
1495 | return -EINVAL; | |
1496 | ||
bd4265fe | 1497 | if (iph->protocol != IPPROTO_IGMP) { |
bf5e4dd6 | 1498 | if (!ipv4_is_local_multicast(iph->daddr)) |
bd4265fe | 1499 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
eb1d1641 | 1500 | return 0; |
bd4265fe | 1501 | } |
eb1d1641 HX |
1502 | |
1503 | len = ntohs(iph->tot_len); | |
1504 | if (skb->len < len || len < ip_hdrlen(skb)) | |
1505 | return -EINVAL; | |
1506 | ||
1507 | if (skb->len > len) { | |
1508 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1509 | if (!skb2) | |
1510 | return -ENOMEM; | |
1511 | ||
1512 | err = pskb_trim_rcsum(skb2, len); | |
1513 | if (err) | |
8440853b | 1514 | goto err_out; |
eb1d1641 HX |
1515 | } |
1516 | ||
1517 | len -= ip_hdrlen(skb2); | |
1518 | offset = skb_network_offset(skb2) + ip_hdrlen(skb2); | |
1519 | __skb_pull(skb2, offset); | |
1520 | skb_reset_transport_header(skb2); | |
1521 | ||
1522 | err = -EINVAL; | |
1523 | if (!pskb_may_pull(skb2, sizeof(*ih))) | |
1524 | goto out; | |
1525 | ||
eb1d1641 HX |
1526 | switch (skb2->ip_summed) { |
1527 | case CHECKSUM_COMPLETE: | |
1528 | if (!csum_fold(skb2->csum)) | |
1529 | break; | |
1530 | /* fall through */ | |
1531 | case CHECKSUM_NONE: | |
1532 | skb2->csum = 0; | |
1533 | if (skb_checksum_complete(skb2)) | |
8440853b | 1534 | goto out; |
eb1d1641 HX |
1535 | } |
1536 | ||
1537 | err = 0; | |
1538 | ||
1539 | BR_INPUT_SKB_CB(skb)->igmp = 1; | |
1540 | ih = igmp_hdr(skb2); | |
1541 | ||
1542 | switch (ih->type) { | |
1543 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1544 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
62b2bcb4 | 1545 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
b0e9a30d | 1546 | err = br_ip4_multicast_add_group(br, port, ih->group, vid); |
eb1d1641 HX |
1547 | break; |
1548 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
06499098 | 1549 | err = br_ip4_multicast_igmp3_report(br, port, skb2, vid); |
eb1d1641 HX |
1550 | break; |
1551 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
06499098 | 1552 | err = br_ip4_multicast_query(br, port, skb2, vid); |
eb1d1641 HX |
1553 | break; |
1554 | case IGMP_HOST_LEAVE_MESSAGE: | |
b0e9a30d | 1555 | br_ip4_multicast_leave_group(br, port, ih->group, vid); |
eb1d1641 HX |
1556 | break; |
1557 | } | |
1558 | ||
1559 | out: | |
1560 | __skb_push(skb2, offset); | |
8440853b | 1561 | err_out: |
eb1d1641 HX |
1562 | if (skb2 != skb) |
1563 | kfree_skb(skb2); | |
1564 | return err; | |
1565 | } | |
1566 | ||
dfd56b8b | 1567 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1568 | static int br_multicast_ipv6_rcv(struct net_bridge *br, |
1569 | struct net_bridge_port *port, | |
06499098 VY |
1570 | struct sk_buff *skb, |
1571 | u16 vid) | |
08b202b6 | 1572 | { |
9d89081d | 1573 | struct sk_buff *skb2; |
b71d1d42 | 1574 | const struct ipv6hdr *ip6h; |
22df1331 | 1575 | u8 icmp6_type; |
08b202b6 | 1576 | u8 nexthdr; |
75f2811c | 1577 | __be16 frag_off; |
95c96174 | 1578 | unsigned int len; |
bb7a0bd6 | 1579 | int offset; |
08b202b6 YH |
1580 | int err; |
1581 | ||
08b202b6 YH |
1582 | if (!pskb_may_pull(skb, sizeof(*ip6h))) |
1583 | return -EINVAL; | |
1584 | ||
1585 | ip6h = ipv6_hdr(skb); | |
1586 | ||
1587 | /* | |
1588 | * We're interested in MLD messages only. | |
1589 | * - Version is 6 | |
1590 | * - MLD has always Router Alert hop-by-hop option | |
1591 | * - But we do not support jumbrograms. | |
1592 | */ | |
8fad9c39 LL |
1593 | if (ip6h->version != 6) |
1594 | return 0; | |
1595 | ||
1596 | /* Prevent flooding this packet if there is no listener present */ | |
3c3769e6 | 1597 | if (!ipv6_addr_is_ll_all_nodes(&ip6h->daddr)) |
8fad9c39 LL |
1598 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
1599 | ||
1600 | if (ip6h->nexthdr != IPPROTO_HOPOPTS || | |
08b202b6 YH |
1601 | ip6h->payload_len == 0) |
1602 | return 0; | |
1603 | ||
ff9a57a6 | 1604 | len = ntohs(ip6h->payload_len) + sizeof(*ip6h); |
08b202b6 YH |
1605 | if (skb->len < len) |
1606 | return -EINVAL; | |
1607 | ||
1608 | nexthdr = ip6h->nexthdr; | |
75f2811c | 1609 | offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off); |
08b202b6 YH |
1610 | |
1611 | if (offset < 0 || nexthdr != IPPROTO_ICMPV6) | |
1612 | return 0; | |
1613 | ||
1614 | /* Okay, we found ICMPv6 header */ | |
1615 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1616 | if (!skb2) | |
1617 | return -ENOMEM; | |
1618 | ||
9d89081d TW |
1619 | err = -EINVAL; |
1620 | if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr))) | |
1621 | goto out; | |
1622 | ||
08b202b6 YH |
1623 | len -= offset - skb_network_offset(skb2); |
1624 | ||
1625 | __skb_pull(skb2, offset); | |
1626 | skb_reset_transport_header(skb2); | |
fa2da8cd | 1627 | skb_postpull_rcsum(skb2, skb_network_header(skb2), |
1628 | skb_network_header_len(skb2)); | |
08b202b6 | 1629 | |
22df1331 | 1630 | icmp6_type = icmp6_hdr(skb2)->icmp6_type; |
08b202b6 | 1631 | |
22df1331 | 1632 | switch (icmp6_type) { |
08b202b6 YH |
1633 | case ICMPV6_MGM_QUERY: |
1634 | case ICMPV6_MGM_REPORT: | |
1635 | case ICMPV6_MGM_REDUCTION: | |
1636 | case ICMPV6_MLD2_REPORT: | |
1637 | break; | |
1638 | default: | |
1639 | err = 0; | |
1640 | goto out; | |
1641 | } | |
1642 | ||
1643 | /* Okay, we found MLD message. Check further. */ | |
1644 | if (skb2->len > len) { | |
1645 | err = pskb_trim_rcsum(skb2, len); | |
1646 | if (err) | |
1647 | goto out; | |
4b275d7e | 1648 | err = -EINVAL; |
08b202b6 YH |
1649 | } |
1650 | ||
4b275d7e YZ |
1651 | ip6h = ipv6_hdr(skb2); |
1652 | ||
08b202b6 YH |
1653 | switch (skb2->ip_summed) { |
1654 | case CHECKSUM_COMPLETE: | |
4b275d7e YZ |
1655 | if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len, |
1656 | IPPROTO_ICMPV6, skb2->csum)) | |
08b202b6 YH |
1657 | break; |
1658 | /*FALLTHROUGH*/ | |
1659 | case CHECKSUM_NONE: | |
4b275d7e YZ |
1660 | skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr, |
1661 | &ip6h->daddr, | |
1662 | skb2->len, | |
1663 | IPPROTO_ICMPV6, 0)); | |
1664 | if (__skb_checksum_complete(skb2)) | |
08b202b6 YH |
1665 | goto out; |
1666 | } | |
1667 | ||
1668 | err = 0; | |
1669 | ||
1670 | BR_INPUT_SKB_CB(skb)->igmp = 1; | |
1671 | ||
22df1331 | 1672 | switch (icmp6_type) { |
08b202b6 YH |
1673 | case ICMPV6_MGM_REPORT: |
1674 | { | |
9d89081d TW |
1675 | struct mld_msg *mld; |
1676 | if (!pskb_may_pull(skb2, sizeof(*mld))) { | |
1677 | err = -EINVAL; | |
1678 | goto out; | |
1679 | } | |
1680 | mld = (struct mld_msg *)skb_transport_header(skb2); | |
fc2af6c7 | 1681 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
b0e9a30d | 1682 | err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid); |
08b202b6 YH |
1683 | break; |
1684 | } | |
1685 | case ICMPV6_MLD2_REPORT: | |
06499098 | 1686 | err = br_ip6_multicast_mld2_report(br, port, skb2, vid); |
08b202b6 YH |
1687 | break; |
1688 | case ICMPV6_MGM_QUERY: | |
06499098 | 1689 | err = br_ip6_multicast_query(br, port, skb2, vid); |
08b202b6 YH |
1690 | break; |
1691 | case ICMPV6_MGM_REDUCTION: | |
1692 | { | |
9d89081d TW |
1693 | struct mld_msg *mld; |
1694 | if (!pskb_may_pull(skb2, sizeof(*mld))) { | |
1695 | err = -EINVAL; | |
1696 | goto out; | |
1697 | } | |
1698 | mld = (struct mld_msg *)skb_transport_header(skb2); | |
b0e9a30d | 1699 | br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid); |
08b202b6 YH |
1700 | } |
1701 | } | |
1702 | ||
1703 | out: | |
9d89081d | 1704 | kfree_skb(skb2); |
08b202b6 YH |
1705 | return err; |
1706 | } | |
1707 | #endif | |
1708 | ||
eb1d1641 | 1709 | int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, |
06499098 | 1710 | struct sk_buff *skb, u16 vid) |
eb1d1641 | 1711 | { |
1fafc7a9 YH |
1712 | BR_INPUT_SKB_CB(skb)->igmp = 0; |
1713 | BR_INPUT_SKB_CB(skb)->mrouters_only = 0; | |
1714 | ||
eb1d1641 HX |
1715 | if (br->multicast_disabled) |
1716 | return 0; | |
1717 | ||
1718 | switch (skb->protocol) { | |
1719 | case htons(ETH_P_IP): | |
06499098 | 1720 | return br_multicast_ipv4_rcv(br, port, skb, vid); |
dfd56b8b | 1721 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 1722 | case htons(ETH_P_IPV6): |
06499098 | 1723 | return br_multicast_ipv6_rcv(br, port, skb, vid); |
08b202b6 | 1724 | #endif |
eb1d1641 HX |
1725 | } |
1726 | ||
1727 | return 0; | |
1728 | } | |
1729 | ||
cc0fdd80 | 1730 | static void br_multicast_query_expired(struct net_bridge *br, |
90010b36 | 1731 | struct bridge_mcast_own_query *query) |
cc0fdd80 LL |
1732 | { |
1733 | spin_lock(&br->multicast_lock); | |
1734 | if (query->startup_sent < br->multicast_startup_query_count) | |
1735 | query->startup_sent++; | |
1736 | ||
1737 | br_multicast_send_query(br, NULL, query); | |
1738 | spin_unlock(&br->multicast_lock); | |
1739 | } | |
1740 | ||
1741 | static void br_ip4_multicast_query_expired(unsigned long data) | |
eb1d1641 HX |
1742 | { |
1743 | struct net_bridge *br = (void *)data; | |
1744 | ||
90010b36 | 1745 | br_multicast_query_expired(br, &br->ip4_own_query); |
cc0fdd80 | 1746 | } |
eb1d1641 | 1747 | |
cc0fdd80 LL |
1748 | #if IS_ENABLED(CONFIG_IPV6) |
1749 | static void br_ip6_multicast_query_expired(unsigned long data) | |
1750 | { | |
1751 | struct net_bridge *br = (void *)data; | |
eb1d1641 | 1752 | |
90010b36 | 1753 | br_multicast_query_expired(br, &br->ip6_own_query); |
eb1d1641 | 1754 | } |
cc0fdd80 | 1755 | #endif |
eb1d1641 HX |
1756 | |
1757 | void br_multicast_init(struct net_bridge *br) | |
1758 | { | |
1759 | br->hash_elasticity = 4; | |
1760 | br->hash_max = 512; | |
1761 | ||
1762 | br->multicast_router = 1; | |
c5c23260 | 1763 | br->multicast_querier = 0; |
1c8ad5bf | 1764 | br->multicast_query_use_ifaddr = 0; |
eb1d1641 HX |
1765 | br->multicast_last_member_count = 2; |
1766 | br->multicast_startup_query_count = 2; | |
1767 | ||
1768 | br->multicast_last_member_interval = HZ; | |
1769 | br->multicast_query_response_interval = 10 * HZ; | |
1770 | br->multicast_startup_query_interval = 125 * HZ / 4; | |
1771 | br->multicast_query_interval = 125 * HZ; | |
1772 | br->multicast_querier_interval = 255 * HZ; | |
1773 | br->multicast_membership_interval = 260 * HZ; | |
1774 | ||
90010b36 | 1775 | br->ip4_other_query.delay_time = 0; |
cc0fdd80 | 1776 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 | 1777 | br->ip6_other_query.delay_time = 0; |
cc0fdd80 | 1778 | #endif |
b00589af | 1779 | |
eb1d1641 HX |
1780 | spin_lock_init(&br->multicast_lock); |
1781 | setup_timer(&br->multicast_router_timer, | |
1782 | br_multicast_local_router_expired, 0); | |
90010b36 LL |
1783 | setup_timer(&br->ip4_other_query.timer, |
1784 | br_ip4_multicast_querier_expired, (unsigned long)br); | |
1785 | setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired, | |
eb1d1641 | 1786 | (unsigned long)br); |
cc0fdd80 | 1787 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 LL |
1788 | setup_timer(&br->ip6_other_query.timer, |
1789 | br_ip6_multicast_querier_expired, (unsigned long)br); | |
1790 | setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired, | |
cc0fdd80 LL |
1791 | (unsigned long)br); |
1792 | #endif | |
eb1d1641 HX |
1793 | } |
1794 | ||
cc0fdd80 | 1795 | static void __br_multicast_open(struct net_bridge *br, |
90010b36 | 1796 | struct bridge_mcast_own_query *query) |
eb1d1641 | 1797 | { |
cc0fdd80 | 1798 | query->startup_sent = 0; |
eb1d1641 HX |
1799 | |
1800 | if (br->multicast_disabled) | |
1801 | return; | |
1802 | ||
cc0fdd80 LL |
1803 | mod_timer(&query->timer, jiffies); |
1804 | } | |
1805 | ||
1806 | void br_multicast_open(struct net_bridge *br) | |
1807 | { | |
90010b36 | 1808 | __br_multicast_open(br, &br->ip4_own_query); |
cc0fdd80 | 1809 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 | 1810 | __br_multicast_open(br, &br->ip6_own_query); |
cc0fdd80 | 1811 | #endif |
eb1d1641 HX |
1812 | } |
1813 | ||
1814 | void br_multicast_stop(struct net_bridge *br) | |
1815 | { | |
1816 | struct net_bridge_mdb_htable *mdb; | |
1817 | struct net_bridge_mdb_entry *mp; | |
b67bfe0d | 1818 | struct hlist_node *n; |
eb1d1641 HX |
1819 | u32 ver; |
1820 | int i; | |
1821 | ||
1822 | del_timer_sync(&br->multicast_router_timer); | |
90010b36 LL |
1823 | del_timer_sync(&br->ip4_other_query.timer); |
1824 | del_timer_sync(&br->ip4_own_query.timer); | |
cc0fdd80 | 1825 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 LL |
1826 | del_timer_sync(&br->ip6_other_query.timer); |
1827 | del_timer_sync(&br->ip6_own_query.timer); | |
cc0fdd80 | 1828 | #endif |
eb1d1641 HX |
1829 | |
1830 | spin_lock_bh(&br->multicast_lock); | |
e8051688 | 1831 | mdb = mlock_dereference(br->mdb, br); |
eb1d1641 HX |
1832 | if (!mdb) |
1833 | goto out; | |
1834 | ||
1835 | br->mdb = NULL; | |
1836 | ||
1837 | ver = mdb->ver; | |
1838 | for (i = 0; i < mdb->max; i++) { | |
b67bfe0d | 1839 | hlist_for_each_entry_safe(mp, n, &mdb->mhash[i], |
eb1d1641 HX |
1840 | hlist[ver]) { |
1841 | del_timer(&mp->timer); | |
eb1d1641 HX |
1842 | call_rcu_bh(&mp->rcu, br_multicast_free_group); |
1843 | } | |
1844 | } | |
1845 | ||
1846 | if (mdb->old) { | |
1847 | spin_unlock_bh(&br->multicast_lock); | |
10cc2b50 | 1848 | rcu_barrier_bh(); |
eb1d1641 HX |
1849 | spin_lock_bh(&br->multicast_lock); |
1850 | WARN_ON(mdb->old); | |
1851 | } | |
1852 | ||
1853 | mdb->old = mdb; | |
1854 | call_rcu_bh(&mdb->rcu, br_mdb_free); | |
1855 | ||
1856 | out: | |
1857 | spin_unlock_bh(&br->multicast_lock); | |
1858 | } | |
0909e117 HX |
1859 | |
1860 | int br_multicast_set_router(struct net_bridge *br, unsigned long val) | |
1861 | { | |
1862 | int err = -ENOENT; | |
1863 | ||
1864 | spin_lock_bh(&br->multicast_lock); | |
1865 | if (!netif_running(br->dev)) | |
1866 | goto unlock; | |
1867 | ||
1868 | switch (val) { | |
1869 | case 0: | |
1870 | case 2: | |
1871 | del_timer(&br->multicast_router_timer); | |
1872 | /* fall through */ | |
1873 | case 1: | |
1874 | br->multicast_router = val; | |
1875 | err = 0; | |
1876 | break; | |
1877 | ||
1878 | default: | |
1879 | err = -EINVAL; | |
1880 | break; | |
1881 | } | |
1882 | ||
1883 | unlock: | |
1884 | spin_unlock_bh(&br->multicast_lock); | |
1885 | ||
1886 | return err; | |
1887 | } | |
1888 | ||
1889 | int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) | |
1890 | { | |
1891 | struct net_bridge *br = p->br; | |
1892 | int err = -ENOENT; | |
1893 | ||
1894 | spin_lock(&br->multicast_lock); | |
1895 | if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED) | |
1896 | goto unlock; | |
1897 | ||
1898 | switch (val) { | |
1899 | case 0: | |
1900 | case 1: | |
1901 | case 2: | |
1902 | p->multicast_router = val; | |
1903 | err = 0; | |
1904 | ||
1905 | if (val < 2 && !hlist_unhashed(&p->rlist)) | |
1906 | hlist_del_init_rcu(&p->rlist); | |
1907 | ||
1908 | if (val == 1) | |
1909 | break; | |
1910 | ||
1911 | del_timer(&p->multicast_router_timer); | |
1912 | ||
1913 | if (val == 0) | |
1914 | break; | |
1915 | ||
1916 | br_multicast_add_router(br, p); | |
1917 | break; | |
1918 | ||
1919 | default: | |
1920 | err = -EINVAL; | |
1921 | break; | |
1922 | } | |
1923 | ||
1924 | unlock: | |
1925 | spin_unlock(&br->multicast_lock); | |
1926 | ||
1927 | return err; | |
1928 | } | |
561f1103 | 1929 | |
cc0fdd80 | 1930 | static void br_multicast_start_querier(struct net_bridge *br, |
90010b36 | 1931 | struct bridge_mcast_own_query *query) |
561f1103 HX |
1932 | { |
1933 | struct net_bridge_port *port; | |
74857216 | 1934 | |
cc0fdd80 | 1935 | __br_multicast_open(br, query); |
74857216 HX |
1936 | |
1937 | list_for_each_entry(port, &br->port_list, list) { | |
1938 | if (port->state == BR_STATE_DISABLED || | |
1939 | port->state == BR_STATE_BLOCKING) | |
1940 | continue; | |
1941 | ||
90010b36 LL |
1942 | if (query == &br->ip4_own_query) |
1943 | br_multicast_enable(&port->ip4_own_query); | |
cc0fdd80 LL |
1944 | #if IS_ENABLED(CONFIG_IPV6) |
1945 | else | |
90010b36 | 1946 | br_multicast_enable(&port->ip6_own_query); |
cc0fdd80 | 1947 | #endif |
74857216 HX |
1948 | } |
1949 | } | |
1950 | ||
1951 | int br_multicast_toggle(struct net_bridge *br, unsigned long val) | |
1952 | { | |
3a7fda06 | 1953 | int err = 0; |
e8051688 | 1954 | struct net_bridge_mdb_htable *mdb; |
561f1103 | 1955 | |
ef5e0d82 | 1956 | spin_lock_bh(&br->multicast_lock); |
561f1103 HX |
1957 | if (br->multicast_disabled == !val) |
1958 | goto unlock; | |
1959 | ||
1960 | br->multicast_disabled = !val; | |
1961 | if (br->multicast_disabled) | |
1962 | goto unlock; | |
1963 | ||
3a7fda06 HX |
1964 | if (!netif_running(br->dev)) |
1965 | goto unlock; | |
1966 | ||
e8051688 ED |
1967 | mdb = mlock_dereference(br->mdb, br); |
1968 | if (mdb) { | |
1969 | if (mdb->old) { | |
561f1103 HX |
1970 | err = -EEXIST; |
1971 | rollback: | |
1972 | br->multicast_disabled = !!val; | |
1973 | goto unlock; | |
1974 | } | |
1975 | ||
e8051688 | 1976 | err = br_mdb_rehash(&br->mdb, mdb->max, |
561f1103 HX |
1977 | br->hash_elasticity); |
1978 | if (err) | |
1979 | goto rollback; | |
1980 | } | |
1981 | ||
90010b36 | 1982 | br_multicast_start_querier(br, &br->ip4_own_query); |
cc0fdd80 | 1983 | #if IS_ENABLED(CONFIG_IPV6) |
90010b36 | 1984 | br_multicast_start_querier(br, &br->ip6_own_query); |
cc0fdd80 | 1985 | #endif |
561f1103 HX |
1986 | |
1987 | unlock: | |
ef5e0d82 | 1988 | spin_unlock_bh(&br->multicast_lock); |
561f1103 HX |
1989 | |
1990 | return err; | |
1991 | } | |
b195167f | 1992 | |
c5c23260 HX |
1993 | int br_multicast_set_querier(struct net_bridge *br, unsigned long val) |
1994 | { | |
b00589af LL |
1995 | unsigned long max_delay; |
1996 | ||
c5c23260 HX |
1997 | val = !!val; |
1998 | ||
1999 | spin_lock_bh(&br->multicast_lock); | |
2000 | if (br->multicast_querier == val) | |
2001 | goto unlock; | |
2002 | ||
2003 | br->multicast_querier = val; | |
b00589af LL |
2004 | if (!val) |
2005 | goto unlock; | |
2006 | ||
2007 | max_delay = br->multicast_query_response_interval; | |
b00589af | 2008 | |
90010b36 LL |
2009 | if (!timer_pending(&br->ip4_other_query.timer)) |
2010 | br->ip4_other_query.delay_time = jiffies + max_delay; | |
cc0fdd80 | 2011 | |
90010b36 | 2012 | br_multicast_start_querier(br, &br->ip4_own_query); |
cc0fdd80 LL |
2013 | |
2014 | #if IS_ENABLED(CONFIG_IPV6) | |
90010b36 LL |
2015 | if (!timer_pending(&br->ip6_other_query.timer)) |
2016 | br->ip6_other_query.delay_time = jiffies + max_delay; | |
cc0fdd80 | 2017 | |
90010b36 | 2018 | br_multicast_start_querier(br, &br->ip6_own_query); |
cc0fdd80 | 2019 | #endif |
c5c23260 HX |
2020 | |
2021 | unlock: | |
2022 | spin_unlock_bh(&br->multicast_lock); | |
2023 | ||
2024 | return 0; | |
2025 | } | |
2026 | ||
b195167f HX |
2027 | int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) |
2028 | { | |
2029 | int err = -ENOENT; | |
2030 | u32 old; | |
e8051688 | 2031 | struct net_bridge_mdb_htable *mdb; |
b195167f | 2032 | |
fe0d692b | 2033 | spin_lock_bh(&br->multicast_lock); |
b195167f HX |
2034 | if (!netif_running(br->dev)) |
2035 | goto unlock; | |
2036 | ||
2037 | err = -EINVAL; | |
2038 | if (!is_power_of_2(val)) | |
2039 | goto unlock; | |
e8051688 ED |
2040 | |
2041 | mdb = mlock_dereference(br->mdb, br); | |
2042 | if (mdb && val < mdb->size) | |
b195167f HX |
2043 | goto unlock; |
2044 | ||
2045 | err = 0; | |
2046 | ||
2047 | old = br->hash_max; | |
2048 | br->hash_max = val; | |
2049 | ||
e8051688 ED |
2050 | if (mdb) { |
2051 | if (mdb->old) { | |
b195167f HX |
2052 | err = -EEXIST; |
2053 | rollback: | |
2054 | br->hash_max = old; | |
2055 | goto unlock; | |
2056 | } | |
2057 | ||
2058 | err = br_mdb_rehash(&br->mdb, br->hash_max, | |
2059 | br->hash_elasticity); | |
2060 | if (err) | |
2061 | goto rollback; | |
2062 | } | |
2063 | ||
2064 | unlock: | |
fe0d692b | 2065 | spin_unlock_bh(&br->multicast_lock); |
b195167f HX |
2066 | |
2067 | return err; | |
2068 | } |