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> | |
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> | |
26 | #include <net/ip.h> | |
dfd56b8b | 27 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
28 | #include <net/ipv6.h> |
29 | #include <net/mld.h> | |
30 | #include <net/addrconf.h> | |
d4c4f07d | 31 | #include <net/ip6_checksum.h> |
08b202b6 | 32 | #endif |
eb1d1641 HX |
33 | |
34 | #include "br_private.h" | |
35 | ||
e8051688 ED |
36 | #define mlock_dereference(X, br) \ |
37 | rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) | |
38 | ||
dfd56b8b | 39 | #if IS_ENABLED(CONFIG_IPV6) |
e4de9f9e | 40 | static inline int ipv6_is_transient_multicast(const struct in6_addr *addr) |
eb1d1641 | 41 | { |
e4de9f9e | 42 | if (ipv6_addr_is_multicast(addr) && IPV6_ADDR_MC_FLAG_TRANSIENT(addr)) |
08b202b6 YH |
43 | return 1; |
44 | return 0; | |
45 | } | |
46 | #endif | |
47 | ||
8ef2a9a5 YH |
48 | static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b) |
49 | { | |
50 | if (a->proto != b->proto) | |
51 | return 0; | |
52 | switch (a->proto) { | |
53 | case htons(ETH_P_IP): | |
54 | return a->u.ip4 == b->u.ip4; | |
dfd56b8b | 55 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
56 | case htons(ETH_P_IPV6): |
57 | return ipv6_addr_equal(&a->u.ip6, &b->u.ip6); | |
58 | #endif | |
8ef2a9a5 YH |
59 | } |
60 | return 0; | |
61 | } | |
62 | ||
63 | static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip) | |
eb1d1641 | 64 | { |
0eae88f3 | 65 | return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1); |
eb1d1641 HX |
66 | } |
67 | ||
dfd56b8b | 68 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
69 | static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb, |
70 | const struct in6_addr *ip) | |
71 | { | |
72 | return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1); | |
73 | } | |
74 | #endif | |
75 | ||
8ef2a9a5 YH |
76 | static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb, |
77 | struct br_ip *ip) | |
78 | { | |
79 | switch (ip->proto) { | |
80 | case htons(ETH_P_IP): | |
81 | return __br_ip4_hash(mdb, ip->u.ip4); | |
dfd56b8b | 82 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
83 | case htons(ETH_P_IPV6): |
84 | return __br_ip6_hash(mdb, &ip->u.ip6); | |
85 | #endif | |
8ef2a9a5 YH |
86 | } |
87 | return 0; | |
eb1d1641 HX |
88 | } |
89 | ||
90 | static struct net_bridge_mdb_entry *__br_mdb_ip_get( | |
8ef2a9a5 | 91 | struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash) |
eb1d1641 HX |
92 | { |
93 | struct net_bridge_mdb_entry *mp; | |
94 | struct hlist_node *p; | |
95 | ||
49f5fcfd | 96 | hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) { |
8ef2a9a5 | 97 | if (br_ip_equal(&mp->addr, dst)) |
eb1d1641 HX |
98 | return mp; |
99 | } | |
100 | ||
101 | return NULL; | |
102 | } | |
103 | ||
7f285fa7 HX |
104 | static struct net_bridge_mdb_entry *br_mdb_ip_get( |
105 | struct net_bridge_mdb_htable *mdb, struct br_ip *dst) | |
106 | { | |
107 | if (!mdb) | |
108 | return NULL; | |
109 | ||
110 | return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst)); | |
111 | } | |
112 | ||
8ef2a9a5 | 113 | static struct net_bridge_mdb_entry *br_mdb_ip4_get( |
eb1d1641 HX |
114 | struct net_bridge_mdb_htable *mdb, __be32 dst) |
115 | { | |
8ef2a9a5 YH |
116 | struct br_ip br_dst; |
117 | ||
118 | br_dst.u.ip4 = dst; | |
119 | br_dst.proto = htons(ETH_P_IP); | |
0821ec55 | 120 | |
7f285fa7 | 121 | return br_mdb_ip_get(mdb, &br_dst); |
8ef2a9a5 YH |
122 | } |
123 | ||
dfd56b8b | 124 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
125 | static struct net_bridge_mdb_entry *br_mdb_ip6_get( |
126 | struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst) | |
127 | { | |
128 | struct br_ip br_dst; | |
0821ec55 | 129 | |
4e3fd7a0 | 130 | br_dst.u.ip6 = *dst; |
08b202b6 YH |
131 | br_dst.proto = htons(ETH_P_IPV6); |
132 | ||
7f285fa7 | 133 | return br_mdb_ip_get(mdb, &br_dst); |
08b202b6 YH |
134 | } |
135 | #endif | |
136 | ||
eb1d1641 HX |
137 | struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, |
138 | struct sk_buff *skb) | |
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 YH |
149 | ip.proto = skb->protocol; |
150 | ||
eb1d1641 HX |
151 | switch (skb->protocol) { |
152 | case htons(ETH_P_IP): | |
8ef2a9a5 YH |
153 | ip.u.ip4 = ip_hdr(skb)->daddr; |
154 | break; | |
dfd56b8b | 155 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 156 | case htons(ETH_P_IPV6): |
4e3fd7a0 | 157 | ip.u.ip6 = ipv6_hdr(skb)->daddr; |
08b202b6 YH |
158 | break; |
159 | #endif | |
8ef2a9a5 YH |
160 | default: |
161 | return NULL; | |
eb1d1641 HX |
162 | } |
163 | ||
8ef2a9a5 | 164 | return br_mdb_ip_get(mdb, &ip); |
eb1d1641 HX |
165 | } |
166 | ||
167 | static void br_mdb_free(struct rcu_head *head) | |
168 | { | |
169 | struct net_bridge_mdb_htable *mdb = | |
170 | container_of(head, struct net_bridge_mdb_htable, rcu); | |
171 | struct net_bridge_mdb_htable *old = mdb->old; | |
172 | ||
173 | mdb->old = NULL; | |
174 | kfree(old->mhash); | |
175 | kfree(old); | |
176 | } | |
177 | ||
178 | static int br_mdb_copy(struct net_bridge_mdb_htable *new, | |
179 | struct net_bridge_mdb_htable *old, | |
180 | int elasticity) | |
181 | { | |
182 | struct net_bridge_mdb_entry *mp; | |
183 | struct hlist_node *p; | |
184 | int maxlen; | |
185 | int len; | |
186 | int i; | |
187 | ||
188 | for (i = 0; i < old->max; i++) | |
189 | hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver]) | |
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; | |
199 | hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver]) | |
200 | len++; | |
201 | if (len > maxlen) | |
202 | maxlen = len; | |
203 | } | |
204 | ||
205 | return maxlen > elasticity ? -EINVAL : 0; | |
206 | } | |
207 | ||
208 | static void br_multicast_free_pg(struct rcu_head *head) | |
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 | ||
8a870178 | 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) || | |
292 | hlist_unhashed(&pg->mglist)) | |
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 | ||
339 | call_rcu_bh(&mdb->rcu, br_mdb_free); | |
340 | ||
341 | out: | |
342 | rcu_assign_pointer(*mdbp, mdb); | |
343 | ||
344 | return 0; | |
345 | } | |
346 | ||
8ef2a9a5 YH |
347 | static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br, |
348 | __be32 group) | |
eb1d1641 HX |
349 | { |
350 | struct sk_buff *skb; | |
351 | struct igmphdr *ih; | |
352 | struct ethhdr *eth; | |
353 | struct iphdr *iph; | |
354 | ||
355 | skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) + | |
356 | sizeof(*ih) + 4); | |
357 | if (!skb) | |
358 | goto out; | |
359 | ||
360 | skb->protocol = htons(ETH_P_IP); | |
361 | ||
362 | skb_reset_mac_header(skb); | |
363 | eth = eth_hdr(skb); | |
364 | ||
365 | memcpy(eth->h_source, br->dev->dev_addr, 6); | |
366 | eth->h_dest[0] = 1; | |
367 | eth->h_dest[1] = 0; | |
368 | eth->h_dest[2] = 0x5e; | |
369 | eth->h_dest[3] = 0; | |
370 | eth->h_dest[4] = 0; | |
371 | eth->h_dest[5] = 1; | |
372 | eth->h_proto = htons(ETH_P_IP); | |
373 | skb_put(skb, sizeof(*eth)); | |
374 | ||
375 | skb_set_network_header(skb, skb->len); | |
376 | iph = ip_hdr(skb); | |
377 | ||
378 | iph->version = 4; | |
379 | iph->ihl = 6; | |
380 | iph->tos = 0xc0; | |
381 | iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4); | |
382 | iph->id = 0; | |
383 | iph->frag_off = htons(IP_DF); | |
384 | iph->ttl = 1; | |
385 | iph->protocol = IPPROTO_IGMP; | |
386 | iph->saddr = 0; | |
387 | iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); | |
388 | ((u8 *)&iph[1])[0] = IPOPT_RA; | |
389 | ((u8 *)&iph[1])[1] = 4; | |
390 | ((u8 *)&iph[1])[2] = 0; | |
391 | ((u8 *)&iph[1])[3] = 0; | |
392 | ip_send_check(iph); | |
393 | skb_put(skb, 24); | |
394 | ||
395 | skb_set_transport_header(skb, skb->len); | |
396 | ih = igmp_hdr(skb); | |
397 | ih->type = IGMP_HOST_MEMBERSHIP_QUERY; | |
398 | ih->code = (group ? br->multicast_last_member_interval : | |
399 | br->multicast_query_response_interval) / | |
400 | (HZ / IGMP_TIMER_SCALE); | |
401 | ih->group = group; | |
402 | ih->csum = 0; | |
403 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
404 | skb_put(skb, sizeof(*ih)); | |
405 | ||
406 | __skb_pull(skb, sizeof(*eth)); | |
407 | ||
408 | out: | |
409 | return skb; | |
410 | } | |
411 | ||
dfd56b8b | 412 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 413 | static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, |
b71d1d42 | 414 | const struct in6_addr *group) |
08b202b6 YH |
415 | { |
416 | struct sk_buff *skb; | |
417 | struct ipv6hdr *ip6h; | |
418 | struct mld_msg *mldq; | |
419 | struct ethhdr *eth; | |
420 | u8 *hopopt; | |
421 | unsigned long interval; | |
422 | ||
423 | skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) + | |
424 | 8 + sizeof(*mldq)); | |
425 | if (!skb) | |
426 | goto out; | |
427 | ||
428 | skb->protocol = htons(ETH_P_IPV6); | |
429 | ||
430 | /* Ethernet header */ | |
431 | skb_reset_mac_header(skb); | |
432 | eth = eth_hdr(skb); | |
433 | ||
434 | memcpy(eth->h_source, br->dev->dev_addr, 6); | |
08b202b6 YH |
435 | eth->h_proto = htons(ETH_P_IPV6); |
436 | skb_put(skb, sizeof(*eth)); | |
437 | ||
438 | /* IPv6 header + HbH option */ | |
439 | skb_set_network_header(skb, skb->len); | |
440 | ip6h = ipv6_hdr(skb); | |
441 | ||
442 | *(__force __be32 *)ip6h = htonl(0x60000000); | |
76d66158 | 443 | ip6h->payload_len = htons(8 + sizeof(*mldq)); |
08b202b6 YH |
444 | ip6h->nexthdr = IPPROTO_HOPOPTS; |
445 | ip6h->hop_limit = 1; | |
a7bff75b | 446 | ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1)); |
d1d81d4c UW |
447 | if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0, |
448 | &ip6h->saddr)) { | |
449 | kfree_skb(skb); | |
450 | return NULL; | |
451 | } | |
36cff5a1 | 452 | ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); |
08b202b6 YH |
453 | |
454 | hopopt = (u8 *)(ip6h + 1); | |
455 | hopopt[0] = IPPROTO_ICMPV6; /* next hdr */ | |
456 | hopopt[1] = 0; /* length of HbH */ | |
457 | hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */ | |
458 | hopopt[3] = 2; /* Length of RA Option */ | |
459 | hopopt[4] = 0; /* Type = 0x0000 (MLD) */ | |
460 | hopopt[5] = 0; | |
461 | hopopt[6] = IPV6_TLV_PAD0; /* Pad0 */ | |
462 | hopopt[7] = IPV6_TLV_PAD0; /* Pad0 */ | |
463 | ||
464 | skb_put(skb, sizeof(*ip6h) + 8); | |
465 | ||
466 | /* ICMPv6 */ | |
467 | skb_set_transport_header(skb, skb->len); | |
468 | mldq = (struct mld_msg *) icmp6_hdr(skb); | |
469 | ||
470 | interval = ipv6_addr_any(group) ? br->multicast_last_member_interval : | |
471 | br->multicast_query_response_interval; | |
472 | ||
473 | mldq->mld_type = ICMPV6_MGM_QUERY; | |
474 | mldq->mld_code = 0; | |
475 | mldq->mld_cksum = 0; | |
476 | mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); | |
477 | mldq->mld_reserved = 0; | |
4e3fd7a0 | 478 | mldq->mld_mca = *group; |
08b202b6 YH |
479 | |
480 | /* checksum */ | |
481 | mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
482 | sizeof(*mldq), IPPROTO_ICMPV6, | |
483 | csum_partial(mldq, | |
484 | sizeof(*mldq), 0)); | |
485 | skb_put(skb, sizeof(*mldq)); | |
486 | ||
487 | __skb_pull(skb, sizeof(*eth)); | |
488 | ||
489 | out: | |
490 | return skb; | |
491 | } | |
492 | #endif | |
493 | ||
8ef2a9a5 YH |
494 | static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, |
495 | struct br_ip *addr) | |
496 | { | |
497 | switch (addr->proto) { | |
498 | case htons(ETH_P_IP): | |
499 | return br_ip4_multicast_alloc_query(br, addr->u.ip4); | |
dfd56b8b | 500 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
501 | case htons(ETH_P_IPV6): |
502 | return br_ip6_multicast_alloc_query(br, &addr->u.ip6); | |
503 | #endif | |
8ef2a9a5 YH |
504 | } |
505 | return NULL; | |
506 | } | |
507 | ||
eb1d1641 | 508 | static struct net_bridge_mdb_entry *br_multicast_get_group( |
8ef2a9a5 YH |
509 | struct net_bridge *br, struct net_bridge_port *port, |
510 | struct br_ip *group, int hash) | |
eb1d1641 | 511 | { |
e8051688 | 512 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 HX |
513 | struct net_bridge_mdb_entry *mp; |
514 | struct hlist_node *p; | |
515 | unsigned count = 0; | |
516 | unsigned max; | |
517 | int elasticity; | |
518 | int err; | |
519 | ||
e8051688 | 520 | mdb = rcu_dereference_protected(br->mdb, 1); |
eb1d1641 HX |
521 | hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) { |
522 | count++; | |
8ef2a9a5 | 523 | if (unlikely(br_ip_equal(group, &mp->addr))) |
eb1d1641 | 524 | return mp; |
eb1d1641 HX |
525 | } |
526 | ||
527 | elasticity = 0; | |
528 | max = mdb->max; | |
529 | ||
530 | if (unlikely(count > br->hash_elasticity && count)) { | |
531 | if (net_ratelimit()) | |
28a16c97 | 532 | br_info(br, "Multicast hash table " |
533 | "chain limit reached: %s\n", | |
534 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
535 | |
536 | elasticity = br->hash_elasticity; | |
537 | } | |
538 | ||
539 | if (mdb->size >= max) { | |
540 | max *= 2; | |
541 | if (unlikely(max >= br->hash_max)) { | |
28a16c97 | 542 | br_warn(br, "Multicast hash table maximum " |
543 | "reached, disabling snooping: %s, %d\n", | |
544 | port ? port->dev->name : br->dev->name, max); | |
eb1d1641 HX |
545 | err = -E2BIG; |
546 | disable: | |
547 | br->multicast_disabled = 1; | |
548 | goto err; | |
549 | } | |
550 | } | |
551 | ||
552 | if (max > mdb->max || elasticity) { | |
553 | if (mdb->old) { | |
554 | if (net_ratelimit()) | |
28a16c97 | 555 | br_info(br, "Multicast hash table " |
556 | "on fire: %s\n", | |
557 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
558 | err = -EEXIST; |
559 | goto err; | |
560 | } | |
561 | ||
562 | err = br_mdb_rehash(&br->mdb, max, elasticity); | |
563 | if (err) { | |
28a16c97 | 564 | br_warn(br, "Cannot rehash multicast " |
565 | "hash table, disabling snooping: %s, %d, %d\n", | |
566 | port ? port->dev->name : br->dev->name, | |
567 | mdb->size, err); | |
eb1d1641 HX |
568 | goto disable; |
569 | } | |
570 | ||
571 | err = -EAGAIN; | |
572 | goto err; | |
573 | } | |
574 | ||
575 | return NULL; | |
576 | ||
577 | err: | |
578 | mp = ERR_PTR(err); | |
579 | return mp; | |
580 | } | |
581 | ||
582 | static struct net_bridge_mdb_entry *br_multicast_new_group( | |
8ef2a9a5 YH |
583 | struct net_bridge *br, struct net_bridge_port *port, |
584 | struct br_ip *group) | |
eb1d1641 | 585 | { |
e8051688 | 586 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 HX |
587 | struct net_bridge_mdb_entry *mp; |
588 | int hash; | |
4c0833bc | 589 | int err; |
eb1d1641 | 590 | |
e8051688 | 591 | mdb = rcu_dereference_protected(br->mdb, 1); |
eb1d1641 | 592 | if (!mdb) { |
4c0833bc TK |
593 | err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0); |
594 | if (err) | |
595 | return ERR_PTR(err); | |
eb1d1641 HX |
596 | goto rehash; |
597 | } | |
598 | ||
599 | hash = br_ip_hash(mdb, group); | |
600 | mp = br_multicast_get_group(br, port, group, hash); | |
601 | switch (PTR_ERR(mp)) { | |
602 | case 0: | |
603 | break; | |
604 | ||
605 | case -EAGAIN: | |
606 | rehash: | |
e8051688 | 607 | mdb = rcu_dereference_protected(br->mdb, 1); |
eb1d1641 HX |
608 | hash = br_ip_hash(mdb, group); |
609 | break; | |
610 | ||
611 | default: | |
612 | goto out; | |
613 | } | |
614 | ||
615 | mp = kzalloc(sizeof(*mp), GFP_ATOMIC); | |
616 | if (unlikely(!mp)) | |
4c0833bc | 617 | return ERR_PTR(-ENOMEM); |
eb1d1641 HX |
618 | |
619 | mp->br = br; | |
8ef2a9a5 | 620 | mp->addr = *group; |
eb1d1641 HX |
621 | setup_timer(&mp->timer, br_multicast_group_expired, |
622 | (unsigned long)mp); | |
eb1d1641 HX |
623 | |
624 | hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]); | |
625 | mdb->size++; | |
626 | ||
627 | out: | |
628 | return mp; | |
629 | } | |
630 | ||
631 | static int br_multicast_add_group(struct net_bridge *br, | |
8ef2a9a5 YH |
632 | struct net_bridge_port *port, |
633 | struct br_ip *group) | |
eb1d1641 HX |
634 | { |
635 | struct net_bridge_mdb_entry *mp; | |
636 | struct net_bridge_port_group *p; | |
e8051688 | 637 | struct net_bridge_port_group __rcu **pp; |
eb1d1641 HX |
638 | unsigned long now = jiffies; |
639 | int err; | |
640 | ||
eb1d1641 HX |
641 | spin_lock(&br->multicast_lock); |
642 | if (!netif_running(br->dev) || | |
643 | (port && port->state == BR_STATE_DISABLED)) | |
644 | goto out; | |
645 | ||
646 | mp = br_multicast_new_group(br, port, group); | |
647 | err = PTR_ERR(mp); | |
4c0833bc | 648 | if (IS_ERR(mp)) |
eb1d1641 HX |
649 | goto err; |
650 | ||
651 | if (!port) { | |
8a870178 | 652 | mp->mglist = true; |
eb1d1641 HX |
653 | mod_timer(&mp->timer, now + br->multicast_membership_interval); |
654 | goto out; | |
655 | } | |
656 | ||
e8051688 ED |
657 | for (pp = &mp->ports; |
658 | (p = mlock_dereference(*pp, br)) != NULL; | |
659 | pp = &p->next) { | |
eb1d1641 HX |
660 | if (p->port == port) |
661 | goto found; | |
662 | if ((unsigned long)p->port < (unsigned long)port) | |
663 | break; | |
664 | } | |
665 | ||
666 | p = kzalloc(sizeof(*p), GFP_ATOMIC); | |
667 | err = -ENOMEM; | |
668 | if (unlikely(!p)) | |
669 | goto err; | |
670 | ||
8ef2a9a5 | 671 | p->addr = *group; |
eb1d1641 HX |
672 | p->port = port; |
673 | p->next = *pp; | |
674 | hlist_add_head(&p->mglist, &port->mglist); | |
675 | setup_timer(&p->timer, br_multicast_port_group_expired, | |
676 | (unsigned long)p); | |
eb1d1641 HX |
677 | |
678 | rcu_assign_pointer(*pp, p); | |
679 | ||
680 | found: | |
681 | mod_timer(&p->timer, now + br->multicast_membership_interval); | |
682 | out: | |
683 | err = 0; | |
684 | ||
685 | err: | |
686 | spin_unlock(&br->multicast_lock); | |
687 | return err; | |
688 | } | |
689 | ||
8ef2a9a5 YH |
690 | static int br_ip4_multicast_add_group(struct net_bridge *br, |
691 | struct net_bridge_port *port, | |
692 | __be32 group) | |
693 | { | |
694 | struct br_ip br_group; | |
695 | ||
696 | if (ipv4_is_local_multicast(group)) | |
697 | return 0; | |
698 | ||
699 | br_group.u.ip4 = group; | |
700 | br_group.proto = htons(ETH_P_IP); | |
701 | ||
702 | return br_multicast_add_group(br, port, &br_group); | |
703 | } | |
704 | ||
dfd56b8b | 705 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
706 | static int br_ip6_multicast_add_group(struct net_bridge *br, |
707 | struct net_bridge_port *port, | |
708 | const struct in6_addr *group) | |
709 | { | |
710 | struct br_ip br_group; | |
711 | ||
e4de9f9e | 712 | if (!ipv6_is_transient_multicast(group)) |
08b202b6 YH |
713 | return 0; |
714 | ||
4e3fd7a0 | 715 | br_group.u.ip6 = *group; |
9cc6e0c4 | 716 | br_group.proto = htons(ETH_P_IPV6); |
08b202b6 YH |
717 | |
718 | return br_multicast_add_group(br, port, &br_group); | |
719 | } | |
720 | #endif | |
721 | ||
eb1d1641 HX |
722 | static void br_multicast_router_expired(unsigned long data) |
723 | { | |
724 | struct net_bridge_port *port = (void *)data; | |
725 | struct net_bridge *br = port->br; | |
726 | ||
727 | spin_lock(&br->multicast_lock); | |
728 | if (port->multicast_router != 1 || | |
729 | timer_pending(&port->multicast_router_timer) || | |
730 | hlist_unhashed(&port->rlist)) | |
731 | goto out; | |
732 | ||
733 | hlist_del_init_rcu(&port->rlist); | |
734 | ||
735 | out: | |
736 | spin_unlock(&br->multicast_lock); | |
737 | } | |
738 | ||
739 | static void br_multicast_local_router_expired(unsigned long data) | |
740 | { | |
741 | } | |
742 | ||
8ef2a9a5 YH |
743 | static void __br_multicast_send_query(struct net_bridge *br, |
744 | struct net_bridge_port *port, | |
745 | struct br_ip *ip) | |
eb1d1641 | 746 | { |
eb1d1641 HX |
747 | struct sk_buff *skb; |
748 | ||
8ef2a9a5 | 749 | skb = br_multicast_alloc_query(br, ip); |
eb1d1641 | 750 | if (!skb) |
8ef2a9a5 | 751 | return; |
eb1d1641 HX |
752 | |
753 | if (port) { | |
754 | __skb_push(skb, sizeof(struct ethhdr)); | |
755 | skb->dev = port->dev; | |
713aefa3 | 756 | NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, |
eb1d1641 HX |
757 | dev_queue_xmit); |
758 | } else | |
759 | netif_rx(skb); | |
8ef2a9a5 YH |
760 | } |
761 | ||
762 | static void br_multicast_send_query(struct net_bridge *br, | |
763 | struct net_bridge_port *port, u32 sent) | |
764 | { | |
765 | unsigned long time; | |
766 | struct br_ip br_group; | |
767 | ||
768 | if (!netif_running(br->dev) || br->multicast_disabled || | |
769 | timer_pending(&br->multicast_querier_timer)) | |
770 | return; | |
771 | ||
08b202b6 YH |
772 | memset(&br_group.u, 0, sizeof(br_group.u)); |
773 | ||
8ef2a9a5 | 774 | br_group.proto = htons(ETH_P_IP); |
08b202b6 | 775 | __br_multicast_send_query(br, port, &br_group); |
8ef2a9a5 | 776 | |
dfd56b8b | 777 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 778 | br_group.proto = htons(ETH_P_IPV6); |
8ef2a9a5 | 779 | __br_multicast_send_query(br, port, &br_group); |
08b202b6 | 780 | #endif |
eb1d1641 | 781 | |
eb1d1641 HX |
782 | time = jiffies; |
783 | time += sent < br->multicast_startup_query_count ? | |
784 | br->multicast_startup_query_interval : | |
785 | br->multicast_query_interval; | |
786 | mod_timer(port ? &port->multicast_query_timer : | |
787 | &br->multicast_query_timer, time); | |
788 | } | |
789 | ||
790 | static void br_multicast_port_query_expired(unsigned long data) | |
791 | { | |
792 | struct net_bridge_port *port = (void *)data; | |
793 | struct net_bridge *br = port->br; | |
794 | ||
795 | spin_lock(&br->multicast_lock); | |
02a780c0 DC |
796 | if (port->state == BR_STATE_DISABLED || |
797 | port->state == BR_STATE_BLOCKING) | |
eb1d1641 HX |
798 | goto out; |
799 | ||
800 | if (port->multicast_startup_queries_sent < | |
801 | br->multicast_startup_query_count) | |
802 | port->multicast_startup_queries_sent++; | |
803 | ||
804 | br_multicast_send_query(port->br, port, | |
805 | port->multicast_startup_queries_sent); | |
806 | ||
807 | out: | |
808 | spin_unlock(&br->multicast_lock); | |
809 | } | |
810 | ||
811 | void br_multicast_add_port(struct net_bridge_port *port) | |
812 | { | |
813 | port->multicast_router = 1; | |
814 | ||
815 | setup_timer(&port->multicast_router_timer, br_multicast_router_expired, | |
816 | (unsigned long)port); | |
817 | setup_timer(&port->multicast_query_timer, | |
818 | br_multicast_port_query_expired, (unsigned long)port); | |
819 | } | |
820 | ||
821 | void br_multicast_del_port(struct net_bridge_port *port) | |
822 | { | |
823 | del_timer_sync(&port->multicast_router_timer); | |
824 | } | |
825 | ||
561f1103 HX |
826 | static void __br_multicast_enable_port(struct net_bridge_port *port) |
827 | { | |
828 | port->multicast_startup_queries_sent = 0; | |
829 | ||
830 | if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 || | |
831 | del_timer(&port->multicast_query_timer)) | |
832 | mod_timer(&port->multicast_query_timer, jiffies); | |
833 | } | |
834 | ||
eb1d1641 HX |
835 | void br_multicast_enable_port(struct net_bridge_port *port) |
836 | { | |
837 | struct net_bridge *br = port->br; | |
838 | ||
839 | spin_lock(&br->multicast_lock); | |
840 | if (br->multicast_disabled || !netif_running(br->dev)) | |
841 | goto out; | |
842 | ||
561f1103 | 843 | __br_multicast_enable_port(port); |
eb1d1641 HX |
844 | |
845 | out: | |
846 | spin_unlock(&br->multicast_lock); | |
847 | } | |
848 | ||
849 | void br_multicast_disable_port(struct net_bridge_port *port) | |
850 | { | |
851 | struct net_bridge *br = port->br; | |
852 | struct net_bridge_port_group *pg; | |
853 | struct hlist_node *p, *n; | |
854 | ||
855 | spin_lock(&br->multicast_lock); | |
856 | hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist) | |
857 | br_multicast_del_pg(br, pg); | |
858 | ||
859 | if (!hlist_unhashed(&port->rlist)) | |
860 | hlist_del_init_rcu(&port->rlist); | |
861 | del_timer(&port->multicast_router_timer); | |
862 | del_timer(&port->multicast_query_timer); | |
863 | spin_unlock(&br->multicast_lock); | |
864 | } | |
865 | ||
8ef2a9a5 YH |
866 | static int br_ip4_multicast_igmp3_report(struct net_bridge *br, |
867 | struct net_bridge_port *port, | |
868 | struct sk_buff *skb) | |
eb1d1641 HX |
869 | { |
870 | struct igmpv3_report *ih; | |
871 | struct igmpv3_grec *grec; | |
872 | int i; | |
873 | int len; | |
874 | int num; | |
875 | int type; | |
876 | int err = 0; | |
877 | __be32 group; | |
878 | ||
879 | if (!pskb_may_pull(skb, sizeof(*ih))) | |
880 | return -EINVAL; | |
881 | ||
882 | ih = igmpv3_report_hdr(skb); | |
883 | num = ntohs(ih->ngrec); | |
884 | len = sizeof(*ih); | |
885 | ||
886 | for (i = 0; i < num; i++) { | |
887 | len += sizeof(*grec); | |
888 | if (!pskb_may_pull(skb, len)) | |
889 | return -EINVAL; | |
890 | ||
fd218cf9 | 891 | grec = (void *)(skb->data + len - sizeof(*grec)); |
eb1d1641 HX |
892 | group = grec->grec_mca; |
893 | type = grec->grec_type; | |
894 | ||
8eabf95c | 895 | len += ntohs(grec->grec_nsrcs) * 4; |
eb1d1641 HX |
896 | if (!pskb_may_pull(skb, len)) |
897 | return -EINVAL; | |
898 | ||
899 | /* We treat this as an IGMPv2 report for now. */ | |
900 | switch (type) { | |
901 | case IGMPV3_MODE_IS_INCLUDE: | |
902 | case IGMPV3_MODE_IS_EXCLUDE: | |
903 | case IGMPV3_CHANGE_TO_INCLUDE: | |
904 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
905 | case IGMPV3_ALLOW_NEW_SOURCES: | |
906 | case IGMPV3_BLOCK_OLD_SOURCES: | |
907 | break; | |
908 | ||
909 | default: | |
910 | continue; | |
911 | } | |
912 | ||
8ef2a9a5 | 913 | err = br_ip4_multicast_add_group(br, port, group); |
eb1d1641 HX |
914 | if (err) |
915 | break; | |
916 | } | |
917 | ||
918 | return err; | |
919 | } | |
920 | ||
dfd56b8b | 921 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
922 | static int br_ip6_multicast_mld2_report(struct net_bridge *br, |
923 | struct net_bridge_port *port, | |
924 | struct sk_buff *skb) | |
925 | { | |
926 | struct icmp6hdr *icmp6h; | |
927 | struct mld2_grec *grec; | |
928 | int i; | |
929 | int len; | |
930 | int num; | |
931 | int err = 0; | |
932 | ||
933 | if (!pskb_may_pull(skb, sizeof(*icmp6h))) | |
934 | return -EINVAL; | |
935 | ||
936 | icmp6h = icmp6_hdr(skb); | |
937 | num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); | |
938 | len = sizeof(*icmp6h); | |
939 | ||
940 | for (i = 0; i < num; i++) { | |
941 | __be16 *nsrcs, _nsrcs; | |
942 | ||
943 | nsrcs = skb_header_pointer(skb, | |
944 | len + offsetof(struct mld2_grec, | |
649e984d | 945 | grec_nsrcs), |
08b202b6 YH |
946 | sizeof(_nsrcs), &_nsrcs); |
947 | if (!nsrcs) | |
948 | return -EINVAL; | |
949 | ||
950 | if (!pskb_may_pull(skb, | |
951 | len + sizeof(*grec) + | |
d41db9f3 | 952 | sizeof(struct in6_addr) * ntohs(*nsrcs))) |
08b202b6 YH |
953 | return -EINVAL; |
954 | ||
955 | grec = (struct mld2_grec *)(skb->data + len); | |
d41db9f3 LL |
956 | len += sizeof(*grec) + |
957 | sizeof(struct in6_addr) * ntohs(*nsrcs); | |
08b202b6 YH |
958 | |
959 | /* We treat these as MLDv1 reports for now. */ | |
960 | switch (grec->grec_type) { | |
961 | case MLD2_MODE_IS_INCLUDE: | |
962 | case MLD2_MODE_IS_EXCLUDE: | |
963 | case MLD2_CHANGE_TO_INCLUDE: | |
964 | case MLD2_CHANGE_TO_EXCLUDE: | |
965 | case MLD2_ALLOW_NEW_SOURCES: | |
966 | case MLD2_BLOCK_OLD_SOURCES: | |
967 | break; | |
968 | ||
969 | default: | |
970 | continue; | |
971 | } | |
972 | ||
973 | err = br_ip6_multicast_add_group(br, port, &grec->grec_mca); | |
974 | if (!err) | |
975 | break; | |
976 | } | |
977 | ||
978 | return err; | |
979 | } | |
980 | #endif | |
981 | ||
7e80c124 | 982 | /* |
983 | * Add port to rotuer_list | |
984 | * list is maintained ordered by pointer value | |
985 | * and locked by br->multicast_lock and RCU | |
986 | */ | |
0909e117 HX |
987 | static void br_multicast_add_router(struct net_bridge *br, |
988 | struct net_bridge_port *port) | |
989 | { | |
dcdca2c4 | 990 | struct net_bridge_port *p; |
7e80c124 | 991 | struct hlist_node *n, *slot = NULL; |
dcdca2c4 | 992 | |
709b9326 | 993 | hlist_for_each_entry(p, n, &br->router_list, rlist) { |
7e80c124 | 994 | if ((unsigned long) port >= (unsigned long) p) |
995 | break; | |
996 | slot = n; | |
dcdca2c4 | 997 | } |
998 | ||
7e80c124 | 999 | if (slot) |
1000 | hlist_add_after_rcu(slot, &port->rlist); | |
dcdca2c4 | 1001 | else |
1002 | hlist_add_head_rcu(&port->rlist, &br->router_list); | |
0909e117 HX |
1003 | } |
1004 | ||
eb1d1641 HX |
1005 | static void br_multicast_mark_router(struct net_bridge *br, |
1006 | struct net_bridge_port *port) | |
1007 | { | |
1008 | unsigned long now = jiffies; | |
eb1d1641 HX |
1009 | |
1010 | if (!port) { | |
1011 | if (br->multicast_router == 1) | |
1012 | mod_timer(&br->multicast_router_timer, | |
1013 | now + br->multicast_querier_interval); | |
1014 | return; | |
1015 | } | |
1016 | ||
1017 | if (port->multicast_router != 1) | |
1018 | return; | |
1019 | ||
1020 | if (!hlist_unhashed(&port->rlist)) | |
1021 | goto timer; | |
1022 | ||
0909e117 | 1023 | br_multicast_add_router(br, port); |
eb1d1641 HX |
1024 | |
1025 | timer: | |
1026 | mod_timer(&port->multicast_router_timer, | |
1027 | now + br->multicast_querier_interval); | |
1028 | } | |
1029 | ||
1030 | static void br_multicast_query_received(struct net_bridge *br, | |
1031 | struct net_bridge_port *port, | |
8ef2a9a5 | 1032 | int saddr) |
eb1d1641 HX |
1033 | { |
1034 | if (saddr) | |
1035 | mod_timer(&br->multicast_querier_timer, | |
1036 | jiffies + br->multicast_querier_interval); | |
1037 | else if (timer_pending(&br->multicast_querier_timer)) | |
1038 | return; | |
1039 | ||
1040 | br_multicast_mark_router(br, port); | |
1041 | } | |
1042 | ||
8ef2a9a5 YH |
1043 | static int br_ip4_multicast_query(struct net_bridge *br, |
1044 | struct net_bridge_port *port, | |
1045 | struct sk_buff *skb) | |
eb1d1641 | 1046 | { |
b71d1d42 | 1047 | const struct iphdr *iph = ip_hdr(skb); |
eb1d1641 HX |
1048 | struct igmphdr *ih = igmp_hdr(skb); |
1049 | struct net_bridge_mdb_entry *mp; | |
1050 | struct igmpv3_query *ih3; | |
1051 | struct net_bridge_port_group *p; | |
e8051688 | 1052 | struct net_bridge_port_group __rcu **pp; |
eb1d1641 HX |
1053 | unsigned long max_delay; |
1054 | unsigned long now = jiffies; | |
1055 | __be32 group; | |
bec68ff1 | 1056 | int err = 0; |
eb1d1641 HX |
1057 | |
1058 | spin_lock(&br->multicast_lock); | |
1059 | if (!netif_running(br->dev) || | |
1060 | (port && port->state == BR_STATE_DISABLED)) | |
1061 | goto out; | |
1062 | ||
8ef2a9a5 | 1063 | br_multicast_query_received(br, port, !!iph->saddr); |
eb1d1641 HX |
1064 | |
1065 | group = ih->group; | |
1066 | ||
1067 | if (skb->len == sizeof(*ih)) { | |
1068 | max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); | |
1069 | ||
1070 | if (!max_delay) { | |
1071 | max_delay = 10 * HZ; | |
1072 | group = 0; | |
1073 | } | |
1074 | } else { | |
bec68ff1 YH |
1075 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) { |
1076 | err = -EINVAL; | |
1077 | goto out; | |
1078 | } | |
eb1d1641 HX |
1079 | |
1080 | ih3 = igmpv3_query_hdr(skb); | |
1081 | if (ih3->nsrcs) | |
bec68ff1 | 1082 | goto out; |
eb1d1641 | 1083 | |
0ba8c9ec YH |
1084 | max_delay = ih3->code ? |
1085 | IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; | |
eb1d1641 HX |
1086 | } |
1087 | ||
1088 | if (!group) | |
1089 | goto out; | |
1090 | ||
e8051688 | 1091 | mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group); |
eb1d1641 HX |
1092 | if (!mp) |
1093 | goto out; | |
1094 | ||
1095 | max_delay *= br->multicast_last_member_count; | |
1096 | ||
8a870178 | 1097 | if (mp->mglist && |
eb1d1641 HX |
1098 | (timer_pending(&mp->timer) ? |
1099 | time_after(mp->timer.expires, now + max_delay) : | |
1100 | try_to_del_timer_sync(&mp->timer) >= 0)) | |
1101 | mod_timer(&mp->timer, now + max_delay); | |
1102 | ||
e8051688 ED |
1103 | for (pp = &mp->ports; |
1104 | (p = mlock_dereference(*pp, br)) != NULL; | |
1105 | pp = &p->next) { | |
eb1d1641 HX |
1106 | if (timer_pending(&p->timer) ? |
1107 | time_after(p->timer.expires, now + max_delay) : | |
1108 | try_to_del_timer_sync(&p->timer) >= 0) | |
24f9cdcb | 1109 | mod_timer(&p->timer, now + max_delay); |
eb1d1641 HX |
1110 | } |
1111 | ||
1112 | out: | |
1113 | spin_unlock(&br->multicast_lock); | |
bec68ff1 | 1114 | return err; |
eb1d1641 HX |
1115 | } |
1116 | ||
dfd56b8b | 1117 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1118 | static int br_ip6_multicast_query(struct net_bridge *br, |
1119 | struct net_bridge_port *port, | |
1120 | struct sk_buff *skb) | |
1121 | { | |
b71d1d42 | 1122 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
08b202b6 YH |
1123 | struct mld_msg *mld = (struct mld_msg *) icmp6_hdr(skb); |
1124 | struct net_bridge_mdb_entry *mp; | |
1125 | struct mld2_query *mld2q; | |
e8051688 ED |
1126 | struct net_bridge_port_group *p; |
1127 | struct net_bridge_port_group __rcu **pp; | |
08b202b6 YH |
1128 | unsigned long max_delay; |
1129 | unsigned long now = jiffies; | |
b71d1d42 | 1130 | const struct in6_addr *group = NULL; |
08b202b6 YH |
1131 | int err = 0; |
1132 | ||
1133 | spin_lock(&br->multicast_lock); | |
1134 | if (!netif_running(br->dev) || | |
1135 | (port && port->state == BR_STATE_DISABLED)) | |
1136 | goto out; | |
1137 | ||
1138 | br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr)); | |
1139 | ||
1140 | if (skb->len == sizeof(*mld)) { | |
1141 | if (!pskb_may_pull(skb, sizeof(*mld))) { | |
1142 | err = -EINVAL; | |
1143 | goto out; | |
1144 | } | |
1145 | mld = (struct mld_msg *) icmp6_hdr(skb); | |
1146 | max_delay = msecs_to_jiffies(htons(mld->mld_maxdelay)); | |
1147 | if (max_delay) | |
1148 | group = &mld->mld_mca; | |
1149 | } else if (skb->len >= sizeof(*mld2q)) { | |
1150 | if (!pskb_may_pull(skb, sizeof(*mld2q))) { | |
1151 | err = -EINVAL; | |
1152 | goto out; | |
1153 | } | |
1154 | mld2q = (struct mld2_query *)icmp6_hdr(skb); | |
1155 | if (!mld2q->mld2q_nsrcs) | |
1156 | group = &mld2q->mld2q_mca; | |
1157 | max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(mld2q->mld2q_mrc) : 1; | |
1158 | } | |
1159 | ||
1160 | if (!group) | |
1161 | goto out; | |
1162 | ||
e8051688 | 1163 | mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group); |
08b202b6 YH |
1164 | if (!mp) |
1165 | goto out; | |
1166 | ||
1167 | max_delay *= br->multicast_last_member_count; | |
8a870178 | 1168 | if (mp->mglist && |
08b202b6 YH |
1169 | (timer_pending(&mp->timer) ? |
1170 | time_after(mp->timer.expires, now + max_delay) : | |
1171 | try_to_del_timer_sync(&mp->timer) >= 0)) | |
1172 | mod_timer(&mp->timer, now + max_delay); | |
1173 | ||
e8051688 ED |
1174 | for (pp = &mp->ports; |
1175 | (p = mlock_dereference(*pp, br)) != NULL; | |
1176 | pp = &p->next) { | |
08b202b6 YH |
1177 | if (timer_pending(&p->timer) ? |
1178 | time_after(p->timer.expires, now + max_delay) : | |
1179 | try_to_del_timer_sync(&p->timer) >= 0) | |
24f9cdcb | 1180 | mod_timer(&p->timer, now + max_delay); |
08b202b6 YH |
1181 | } |
1182 | ||
1183 | out: | |
1184 | spin_unlock(&br->multicast_lock); | |
1185 | return err; | |
1186 | } | |
1187 | #endif | |
1188 | ||
eb1d1641 HX |
1189 | static void br_multicast_leave_group(struct net_bridge *br, |
1190 | struct net_bridge_port *port, | |
8ef2a9a5 | 1191 | struct br_ip *group) |
eb1d1641 HX |
1192 | { |
1193 | struct net_bridge_mdb_htable *mdb; | |
1194 | struct net_bridge_mdb_entry *mp; | |
1195 | struct net_bridge_port_group *p; | |
1196 | unsigned long now; | |
1197 | unsigned long time; | |
1198 | ||
eb1d1641 HX |
1199 | spin_lock(&br->multicast_lock); |
1200 | if (!netif_running(br->dev) || | |
1201 | (port && port->state == BR_STATE_DISABLED) || | |
1202 | timer_pending(&br->multicast_querier_timer)) | |
1203 | goto out; | |
1204 | ||
e8051688 | 1205 | mdb = mlock_dereference(br->mdb, br); |
eb1d1641 HX |
1206 | mp = br_mdb_ip_get(mdb, group); |
1207 | if (!mp) | |
1208 | goto out; | |
1209 | ||
1210 | now = jiffies; | |
1211 | time = now + br->multicast_last_member_count * | |
1212 | br->multicast_last_member_interval; | |
1213 | ||
1214 | if (!port) { | |
8a870178 | 1215 | if (mp->mglist && |
eb1d1641 HX |
1216 | (timer_pending(&mp->timer) ? |
1217 | time_after(mp->timer.expires, time) : | |
1218 | try_to_del_timer_sync(&mp->timer) >= 0)) { | |
1219 | mod_timer(&mp->timer, time); | |
eb1d1641 HX |
1220 | } |
1221 | ||
1222 | goto out; | |
1223 | } | |
1224 | ||
e8051688 ED |
1225 | for (p = mlock_dereference(mp->ports, br); |
1226 | p != NULL; | |
1227 | p = mlock_dereference(p->next, br)) { | |
eb1d1641 HX |
1228 | if (p->port != port) |
1229 | continue; | |
1230 | ||
1231 | if (!hlist_unhashed(&p->mglist) && | |
1232 | (timer_pending(&p->timer) ? | |
1233 | time_after(p->timer.expires, time) : | |
1234 | try_to_del_timer_sync(&p->timer) >= 0)) { | |
1235 | mod_timer(&p->timer, time); | |
eb1d1641 HX |
1236 | } |
1237 | ||
1238 | break; | |
1239 | } | |
1240 | ||
1241 | out: | |
1242 | spin_unlock(&br->multicast_lock); | |
1243 | } | |
1244 | ||
8ef2a9a5 YH |
1245 | static void br_ip4_multicast_leave_group(struct net_bridge *br, |
1246 | struct net_bridge_port *port, | |
1247 | __be32 group) | |
1248 | { | |
1249 | struct br_ip br_group; | |
1250 | ||
1251 | if (ipv4_is_local_multicast(group)) | |
1252 | return; | |
1253 | ||
1254 | br_group.u.ip4 = group; | |
1255 | br_group.proto = htons(ETH_P_IP); | |
1256 | ||
1257 | br_multicast_leave_group(br, port, &br_group); | |
1258 | } | |
1259 | ||
dfd56b8b | 1260 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1261 | static void br_ip6_multicast_leave_group(struct net_bridge *br, |
1262 | struct net_bridge_port *port, | |
1263 | const struct in6_addr *group) | |
1264 | { | |
1265 | struct br_ip br_group; | |
1266 | ||
e4de9f9e | 1267 | if (!ipv6_is_transient_multicast(group)) |
08b202b6 YH |
1268 | return; |
1269 | ||
4e3fd7a0 | 1270 | br_group.u.ip6 = *group; |
08b202b6 YH |
1271 | br_group.proto = htons(ETH_P_IPV6); |
1272 | ||
1273 | br_multicast_leave_group(br, port, &br_group); | |
1274 | } | |
1275 | #endif | |
8ef2a9a5 | 1276 | |
eb1d1641 HX |
1277 | static int br_multicast_ipv4_rcv(struct net_bridge *br, |
1278 | struct net_bridge_port *port, | |
1279 | struct sk_buff *skb) | |
1280 | { | |
1281 | struct sk_buff *skb2 = skb; | |
b71d1d42 | 1282 | const struct iphdr *iph; |
eb1d1641 HX |
1283 | struct igmphdr *ih; |
1284 | unsigned len; | |
1285 | unsigned offset; | |
1286 | int err; | |
1287 | ||
eb1d1641 HX |
1288 | /* We treat OOM as packet loss for now. */ |
1289 | if (!pskb_may_pull(skb, sizeof(*iph))) | |
1290 | return -EINVAL; | |
1291 | ||
1292 | iph = ip_hdr(skb); | |
1293 | ||
1294 | if (iph->ihl < 5 || iph->version != 4) | |
1295 | return -EINVAL; | |
1296 | ||
1297 | if (!pskb_may_pull(skb, ip_hdrlen(skb))) | |
1298 | return -EINVAL; | |
1299 | ||
1300 | iph = ip_hdr(skb); | |
1301 | ||
1302 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
1303 | return -EINVAL; | |
1304 | ||
bd4265fe HX |
1305 | if (iph->protocol != IPPROTO_IGMP) { |
1306 | if ((iph->daddr & IGMP_LOCAL_GROUP_MASK) != IGMP_LOCAL_GROUP) | |
1307 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; | |
eb1d1641 | 1308 | return 0; |
bd4265fe | 1309 | } |
eb1d1641 HX |
1310 | |
1311 | len = ntohs(iph->tot_len); | |
1312 | if (skb->len < len || len < ip_hdrlen(skb)) | |
1313 | return -EINVAL; | |
1314 | ||
1315 | if (skb->len > len) { | |
1316 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1317 | if (!skb2) | |
1318 | return -ENOMEM; | |
1319 | ||
1320 | err = pskb_trim_rcsum(skb2, len); | |
1321 | if (err) | |
8440853b | 1322 | goto err_out; |
eb1d1641 HX |
1323 | } |
1324 | ||
1325 | len -= ip_hdrlen(skb2); | |
1326 | offset = skb_network_offset(skb2) + ip_hdrlen(skb2); | |
1327 | __skb_pull(skb2, offset); | |
1328 | skb_reset_transport_header(skb2); | |
1329 | ||
1330 | err = -EINVAL; | |
1331 | if (!pskb_may_pull(skb2, sizeof(*ih))) | |
1332 | goto out; | |
1333 | ||
eb1d1641 HX |
1334 | switch (skb2->ip_summed) { |
1335 | case CHECKSUM_COMPLETE: | |
1336 | if (!csum_fold(skb2->csum)) | |
1337 | break; | |
1338 | /* fall through */ | |
1339 | case CHECKSUM_NONE: | |
1340 | skb2->csum = 0; | |
1341 | if (skb_checksum_complete(skb2)) | |
8440853b | 1342 | goto out; |
eb1d1641 HX |
1343 | } |
1344 | ||
1345 | err = 0; | |
1346 | ||
1347 | BR_INPUT_SKB_CB(skb)->igmp = 1; | |
1348 | ih = igmp_hdr(skb2); | |
1349 | ||
1350 | switch (ih->type) { | |
1351 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1352 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
62b2bcb4 | 1353 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
8ef2a9a5 | 1354 | err = br_ip4_multicast_add_group(br, port, ih->group); |
eb1d1641 HX |
1355 | break; |
1356 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
8ef2a9a5 | 1357 | err = br_ip4_multicast_igmp3_report(br, port, skb2); |
eb1d1641 HX |
1358 | break; |
1359 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
8ef2a9a5 | 1360 | err = br_ip4_multicast_query(br, port, skb2); |
eb1d1641 HX |
1361 | break; |
1362 | case IGMP_HOST_LEAVE_MESSAGE: | |
8ef2a9a5 | 1363 | br_ip4_multicast_leave_group(br, port, ih->group); |
eb1d1641 HX |
1364 | break; |
1365 | } | |
1366 | ||
1367 | out: | |
1368 | __skb_push(skb2, offset); | |
8440853b | 1369 | err_out: |
eb1d1641 HX |
1370 | if (skb2 != skb) |
1371 | kfree_skb(skb2); | |
1372 | return err; | |
1373 | } | |
1374 | ||
dfd56b8b | 1375 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1376 | static int br_multicast_ipv6_rcv(struct net_bridge *br, |
1377 | struct net_bridge_port *port, | |
1378 | struct sk_buff *skb) | |
1379 | { | |
9d89081d | 1380 | struct sk_buff *skb2; |
b71d1d42 | 1381 | const struct ipv6hdr *ip6h; |
22df1331 | 1382 | u8 icmp6_type; |
08b202b6 | 1383 | u8 nexthdr; |
75f2811c | 1384 | __be16 frag_off; |
08b202b6 | 1385 | unsigned len; |
bb7a0bd6 | 1386 | int offset; |
08b202b6 YH |
1387 | int err; |
1388 | ||
08b202b6 YH |
1389 | if (!pskb_may_pull(skb, sizeof(*ip6h))) |
1390 | return -EINVAL; | |
1391 | ||
1392 | ip6h = ipv6_hdr(skb); | |
1393 | ||
1394 | /* | |
1395 | * We're interested in MLD messages only. | |
1396 | * - Version is 6 | |
1397 | * - MLD has always Router Alert hop-by-hop option | |
1398 | * - But we do not support jumbrograms. | |
1399 | */ | |
1400 | if (ip6h->version != 6 || | |
1401 | ip6h->nexthdr != IPPROTO_HOPOPTS || | |
1402 | ip6h->payload_len == 0) | |
1403 | return 0; | |
1404 | ||
ff9a57a6 | 1405 | len = ntohs(ip6h->payload_len) + sizeof(*ip6h); |
08b202b6 YH |
1406 | if (skb->len < len) |
1407 | return -EINVAL; | |
1408 | ||
1409 | nexthdr = ip6h->nexthdr; | |
75f2811c | 1410 | offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off); |
08b202b6 YH |
1411 | |
1412 | if (offset < 0 || nexthdr != IPPROTO_ICMPV6) | |
1413 | return 0; | |
1414 | ||
1415 | /* Okay, we found ICMPv6 header */ | |
1416 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1417 | if (!skb2) | |
1418 | return -ENOMEM; | |
1419 | ||
9d89081d TW |
1420 | err = -EINVAL; |
1421 | if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr))) | |
1422 | goto out; | |
1423 | ||
08b202b6 YH |
1424 | len -= offset - skb_network_offset(skb2); |
1425 | ||
1426 | __skb_pull(skb2, offset); | |
1427 | skb_reset_transport_header(skb2); | |
fa2da8cd | 1428 | skb_postpull_rcsum(skb2, skb_network_header(skb2), |
1429 | skb_network_header_len(skb2)); | |
08b202b6 | 1430 | |
22df1331 | 1431 | icmp6_type = icmp6_hdr(skb2)->icmp6_type; |
08b202b6 | 1432 | |
22df1331 | 1433 | switch (icmp6_type) { |
08b202b6 YH |
1434 | case ICMPV6_MGM_QUERY: |
1435 | case ICMPV6_MGM_REPORT: | |
1436 | case ICMPV6_MGM_REDUCTION: | |
1437 | case ICMPV6_MLD2_REPORT: | |
1438 | break; | |
1439 | default: | |
1440 | err = 0; | |
1441 | goto out; | |
1442 | } | |
1443 | ||
1444 | /* Okay, we found MLD message. Check further. */ | |
1445 | if (skb2->len > len) { | |
1446 | err = pskb_trim_rcsum(skb2, len); | |
1447 | if (err) | |
1448 | goto out; | |
4b275d7e | 1449 | err = -EINVAL; |
08b202b6 YH |
1450 | } |
1451 | ||
4b275d7e YZ |
1452 | ip6h = ipv6_hdr(skb2); |
1453 | ||
08b202b6 YH |
1454 | switch (skb2->ip_summed) { |
1455 | case CHECKSUM_COMPLETE: | |
4b275d7e YZ |
1456 | if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len, |
1457 | IPPROTO_ICMPV6, skb2->csum)) | |
08b202b6 YH |
1458 | break; |
1459 | /*FALLTHROUGH*/ | |
1460 | case CHECKSUM_NONE: | |
4b275d7e YZ |
1461 | skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr, |
1462 | &ip6h->daddr, | |
1463 | skb2->len, | |
1464 | IPPROTO_ICMPV6, 0)); | |
1465 | if (__skb_checksum_complete(skb2)) | |
08b202b6 YH |
1466 | goto out; |
1467 | } | |
1468 | ||
1469 | err = 0; | |
1470 | ||
1471 | BR_INPUT_SKB_CB(skb)->igmp = 1; | |
1472 | ||
22df1331 | 1473 | switch (icmp6_type) { |
08b202b6 YH |
1474 | case ICMPV6_MGM_REPORT: |
1475 | { | |
9d89081d TW |
1476 | struct mld_msg *mld; |
1477 | if (!pskb_may_pull(skb2, sizeof(*mld))) { | |
1478 | err = -EINVAL; | |
1479 | goto out; | |
1480 | } | |
1481 | mld = (struct mld_msg *)skb_transport_header(skb2); | |
fc2af6c7 | 1482 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
08b202b6 YH |
1483 | err = br_ip6_multicast_add_group(br, port, &mld->mld_mca); |
1484 | break; | |
1485 | } | |
1486 | case ICMPV6_MLD2_REPORT: | |
1487 | err = br_ip6_multicast_mld2_report(br, port, skb2); | |
1488 | break; | |
1489 | case ICMPV6_MGM_QUERY: | |
1490 | err = br_ip6_multicast_query(br, port, skb2); | |
1491 | break; | |
1492 | case ICMPV6_MGM_REDUCTION: | |
1493 | { | |
9d89081d TW |
1494 | struct mld_msg *mld; |
1495 | if (!pskb_may_pull(skb2, sizeof(*mld))) { | |
1496 | err = -EINVAL; | |
1497 | goto out; | |
1498 | } | |
1499 | mld = (struct mld_msg *)skb_transport_header(skb2); | |
08b202b6 YH |
1500 | br_ip6_multicast_leave_group(br, port, &mld->mld_mca); |
1501 | } | |
1502 | } | |
1503 | ||
1504 | out: | |
9d89081d | 1505 | kfree_skb(skb2); |
08b202b6 YH |
1506 | return err; |
1507 | } | |
1508 | #endif | |
1509 | ||
eb1d1641 HX |
1510 | int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, |
1511 | struct sk_buff *skb) | |
1512 | { | |
1fafc7a9 YH |
1513 | BR_INPUT_SKB_CB(skb)->igmp = 0; |
1514 | BR_INPUT_SKB_CB(skb)->mrouters_only = 0; | |
1515 | ||
eb1d1641 HX |
1516 | if (br->multicast_disabled) |
1517 | return 0; | |
1518 | ||
1519 | switch (skb->protocol) { | |
1520 | case htons(ETH_P_IP): | |
1521 | return br_multicast_ipv4_rcv(br, port, skb); | |
dfd56b8b | 1522 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1523 | case htons(ETH_P_IPV6): |
1524 | return br_multicast_ipv6_rcv(br, port, skb); | |
1525 | #endif | |
eb1d1641 HX |
1526 | } |
1527 | ||
1528 | return 0; | |
1529 | } | |
1530 | ||
1531 | static void br_multicast_query_expired(unsigned long data) | |
1532 | { | |
1533 | struct net_bridge *br = (void *)data; | |
1534 | ||
1535 | spin_lock(&br->multicast_lock); | |
1536 | if (br->multicast_startup_queries_sent < | |
1537 | br->multicast_startup_query_count) | |
1538 | br->multicast_startup_queries_sent++; | |
1539 | ||
1540 | br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent); | |
1541 | ||
1542 | spin_unlock(&br->multicast_lock); | |
1543 | } | |
1544 | ||
1545 | void br_multicast_init(struct net_bridge *br) | |
1546 | { | |
1547 | br->hash_elasticity = 4; | |
1548 | br->hash_max = 512; | |
1549 | ||
1550 | br->multicast_router = 1; | |
1551 | br->multicast_last_member_count = 2; | |
1552 | br->multicast_startup_query_count = 2; | |
1553 | ||
1554 | br->multicast_last_member_interval = HZ; | |
1555 | br->multicast_query_response_interval = 10 * HZ; | |
1556 | br->multicast_startup_query_interval = 125 * HZ / 4; | |
1557 | br->multicast_query_interval = 125 * HZ; | |
1558 | br->multicast_querier_interval = 255 * HZ; | |
1559 | br->multicast_membership_interval = 260 * HZ; | |
1560 | ||
1561 | spin_lock_init(&br->multicast_lock); | |
1562 | setup_timer(&br->multicast_router_timer, | |
1563 | br_multicast_local_router_expired, 0); | |
1564 | setup_timer(&br->multicast_querier_timer, | |
1565 | br_multicast_local_router_expired, 0); | |
1566 | setup_timer(&br->multicast_query_timer, br_multicast_query_expired, | |
1567 | (unsigned long)br); | |
1568 | } | |
1569 | ||
1570 | void br_multicast_open(struct net_bridge *br) | |
1571 | { | |
1572 | br->multicast_startup_queries_sent = 0; | |
1573 | ||
1574 | if (br->multicast_disabled) | |
1575 | return; | |
1576 | ||
1577 | mod_timer(&br->multicast_query_timer, jiffies); | |
1578 | } | |
1579 | ||
1580 | void br_multicast_stop(struct net_bridge *br) | |
1581 | { | |
1582 | struct net_bridge_mdb_htable *mdb; | |
1583 | struct net_bridge_mdb_entry *mp; | |
1584 | struct hlist_node *p, *n; | |
1585 | u32 ver; | |
1586 | int i; | |
1587 | ||
1588 | del_timer_sync(&br->multicast_router_timer); | |
1589 | del_timer_sync(&br->multicast_querier_timer); | |
1590 | del_timer_sync(&br->multicast_query_timer); | |
1591 | ||
1592 | spin_lock_bh(&br->multicast_lock); | |
e8051688 | 1593 | mdb = mlock_dereference(br->mdb, br); |
eb1d1641 HX |
1594 | if (!mdb) |
1595 | goto out; | |
1596 | ||
1597 | br->mdb = NULL; | |
1598 | ||
1599 | ver = mdb->ver; | |
1600 | for (i = 0; i < mdb->max; i++) { | |
1601 | hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i], | |
1602 | hlist[ver]) { | |
1603 | del_timer(&mp->timer); | |
eb1d1641 HX |
1604 | call_rcu_bh(&mp->rcu, br_multicast_free_group); |
1605 | } | |
1606 | } | |
1607 | ||
1608 | if (mdb->old) { | |
1609 | spin_unlock_bh(&br->multicast_lock); | |
10cc2b50 | 1610 | rcu_barrier_bh(); |
eb1d1641 HX |
1611 | spin_lock_bh(&br->multicast_lock); |
1612 | WARN_ON(mdb->old); | |
1613 | } | |
1614 | ||
1615 | mdb->old = mdb; | |
1616 | call_rcu_bh(&mdb->rcu, br_mdb_free); | |
1617 | ||
1618 | out: | |
1619 | spin_unlock_bh(&br->multicast_lock); | |
1620 | } | |
0909e117 HX |
1621 | |
1622 | int br_multicast_set_router(struct net_bridge *br, unsigned long val) | |
1623 | { | |
1624 | int err = -ENOENT; | |
1625 | ||
1626 | spin_lock_bh(&br->multicast_lock); | |
1627 | if (!netif_running(br->dev)) | |
1628 | goto unlock; | |
1629 | ||
1630 | switch (val) { | |
1631 | case 0: | |
1632 | case 2: | |
1633 | del_timer(&br->multicast_router_timer); | |
1634 | /* fall through */ | |
1635 | case 1: | |
1636 | br->multicast_router = val; | |
1637 | err = 0; | |
1638 | break; | |
1639 | ||
1640 | default: | |
1641 | err = -EINVAL; | |
1642 | break; | |
1643 | } | |
1644 | ||
1645 | unlock: | |
1646 | spin_unlock_bh(&br->multicast_lock); | |
1647 | ||
1648 | return err; | |
1649 | } | |
1650 | ||
1651 | int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) | |
1652 | { | |
1653 | struct net_bridge *br = p->br; | |
1654 | int err = -ENOENT; | |
1655 | ||
1656 | spin_lock(&br->multicast_lock); | |
1657 | if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED) | |
1658 | goto unlock; | |
1659 | ||
1660 | switch (val) { | |
1661 | case 0: | |
1662 | case 1: | |
1663 | case 2: | |
1664 | p->multicast_router = val; | |
1665 | err = 0; | |
1666 | ||
1667 | if (val < 2 && !hlist_unhashed(&p->rlist)) | |
1668 | hlist_del_init_rcu(&p->rlist); | |
1669 | ||
1670 | if (val == 1) | |
1671 | break; | |
1672 | ||
1673 | del_timer(&p->multicast_router_timer); | |
1674 | ||
1675 | if (val == 0) | |
1676 | break; | |
1677 | ||
1678 | br_multicast_add_router(br, p); | |
1679 | break; | |
1680 | ||
1681 | default: | |
1682 | err = -EINVAL; | |
1683 | break; | |
1684 | } | |
1685 | ||
1686 | unlock: | |
1687 | spin_unlock(&br->multicast_lock); | |
1688 | ||
1689 | return err; | |
1690 | } | |
561f1103 HX |
1691 | |
1692 | int br_multicast_toggle(struct net_bridge *br, unsigned long val) | |
1693 | { | |
1694 | struct net_bridge_port *port; | |
3a7fda06 | 1695 | int err = 0; |
e8051688 | 1696 | struct net_bridge_mdb_htable *mdb; |
561f1103 | 1697 | |
ef5e0d82 | 1698 | spin_lock_bh(&br->multicast_lock); |
561f1103 HX |
1699 | if (br->multicast_disabled == !val) |
1700 | goto unlock; | |
1701 | ||
1702 | br->multicast_disabled = !val; | |
1703 | if (br->multicast_disabled) | |
1704 | goto unlock; | |
1705 | ||
3a7fda06 HX |
1706 | if (!netif_running(br->dev)) |
1707 | goto unlock; | |
1708 | ||
e8051688 ED |
1709 | mdb = mlock_dereference(br->mdb, br); |
1710 | if (mdb) { | |
1711 | if (mdb->old) { | |
561f1103 HX |
1712 | err = -EEXIST; |
1713 | rollback: | |
1714 | br->multicast_disabled = !!val; | |
1715 | goto unlock; | |
1716 | } | |
1717 | ||
e8051688 | 1718 | err = br_mdb_rehash(&br->mdb, mdb->max, |
561f1103 HX |
1719 | br->hash_elasticity); |
1720 | if (err) | |
1721 | goto rollback; | |
1722 | } | |
1723 | ||
1724 | br_multicast_open(br); | |
1725 | list_for_each_entry(port, &br->port_list, list) { | |
1726 | if (port->state == BR_STATE_DISABLED || | |
1727 | port->state == BR_STATE_BLOCKING) | |
1728 | continue; | |
1729 | ||
1730 | __br_multicast_enable_port(port); | |
1731 | } | |
1732 | ||
1733 | unlock: | |
ef5e0d82 | 1734 | spin_unlock_bh(&br->multicast_lock); |
561f1103 HX |
1735 | |
1736 | return err; | |
1737 | } | |
b195167f HX |
1738 | |
1739 | int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) | |
1740 | { | |
1741 | int err = -ENOENT; | |
1742 | u32 old; | |
e8051688 | 1743 | struct net_bridge_mdb_htable *mdb; |
b195167f HX |
1744 | |
1745 | spin_lock(&br->multicast_lock); | |
1746 | if (!netif_running(br->dev)) | |
1747 | goto unlock; | |
1748 | ||
1749 | err = -EINVAL; | |
1750 | if (!is_power_of_2(val)) | |
1751 | goto unlock; | |
e8051688 ED |
1752 | |
1753 | mdb = mlock_dereference(br->mdb, br); | |
1754 | if (mdb && val < mdb->size) | |
b195167f HX |
1755 | goto unlock; |
1756 | ||
1757 | err = 0; | |
1758 | ||
1759 | old = br->hash_max; | |
1760 | br->hash_max = val; | |
1761 | ||
e8051688 ED |
1762 | if (mdb) { |
1763 | if (mdb->old) { | |
b195167f HX |
1764 | err = -EEXIST; |
1765 | rollback: | |
1766 | br->hash_max = old; | |
1767 | goto unlock; | |
1768 | } | |
1769 | ||
1770 | err = br_mdb_rehash(&br->mdb, br->hash_max, | |
1771 | br->hash_elasticity); | |
1772 | if (err) | |
1773 | goto rollback; | |
1774 | } | |
1775 | ||
1776 | unlock: | |
1777 | spin_unlock(&br->multicast_lock); | |
1778 | ||
1779 | return err; | |
1780 | } |