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Commit | Line | Data |
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eb1d1641 HX |
1 | /* |
2 | * Bridge multicast support. | |
3 | * | |
4 | * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the Free | |
8 | * Software Foundation; either version 2 of the License, or (at your option) | |
9 | * any later version. | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/err.h> | |
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> | |
27 | ||
28 | #include "br_private.h" | |
29 | ||
8ef2a9a5 YH |
30 | static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b) |
31 | { | |
32 | if (a->proto != b->proto) | |
33 | return 0; | |
34 | switch (a->proto) { | |
35 | case htons(ETH_P_IP): | |
36 | return a->u.ip4 == b->u.ip4; | |
37 | } | |
38 | return 0; | |
39 | } | |
40 | ||
41 | static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip) | |
eb1d1641 | 42 | { |
0eae88f3 | 43 | return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1); |
eb1d1641 HX |
44 | } |
45 | ||
8ef2a9a5 YH |
46 | static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb, |
47 | struct br_ip *ip) | |
48 | { | |
49 | switch (ip->proto) { | |
50 | case htons(ETH_P_IP): | |
51 | return __br_ip4_hash(mdb, ip->u.ip4); | |
52 | } | |
53 | return 0; | |
54 | } | |
55 | ||
eb1d1641 | 56 | static struct net_bridge_mdb_entry *__br_mdb_ip_get( |
8ef2a9a5 | 57 | struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash) |
eb1d1641 HX |
58 | { |
59 | struct net_bridge_mdb_entry *mp; | |
60 | struct hlist_node *p; | |
61 | ||
49f5fcfd | 62 | hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) { |
8ef2a9a5 | 63 | if (br_ip_equal(&mp->addr, dst)) |
eb1d1641 HX |
64 | return mp; |
65 | } | |
66 | ||
67 | return NULL; | |
68 | } | |
69 | ||
8ef2a9a5 | 70 | static struct net_bridge_mdb_entry *br_mdb_ip4_get( |
eb1d1641 HX |
71 | struct net_bridge_mdb_htable *mdb, __be32 dst) |
72 | { | |
8ef2a9a5 YH |
73 | struct br_ip br_dst; |
74 | ||
75 | br_dst.u.ip4 = dst; | |
76 | br_dst.proto = htons(ETH_P_IP); | |
0821ec55 | 77 | |
8ef2a9a5 YH |
78 | return __br_mdb_ip_get(mdb, &br_dst, __br_ip4_hash(mdb, dst)); |
79 | } | |
80 | ||
81 | static struct net_bridge_mdb_entry *br_mdb_ip_get( | |
82 | struct net_bridge_mdb_htable *mdb, struct br_ip *dst) | |
83 | { | |
eb1d1641 HX |
84 | return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst)); |
85 | } | |
86 | ||
87 | struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, | |
88 | struct sk_buff *skb) | |
89 | { | |
8ef2a9a5 YH |
90 | struct net_bridge_mdb_htable *mdb = br->mdb; |
91 | struct br_ip ip; | |
92 | ||
93 | if (!mdb || br->multicast_disabled) | |
94 | return NULL; | |
95 | ||
96 | if (BR_INPUT_SKB_CB(skb)->igmp) | |
eb1d1641 HX |
97 | return NULL; |
98 | ||
8ef2a9a5 YH |
99 | ip.proto = skb->protocol; |
100 | ||
eb1d1641 HX |
101 | switch (skb->protocol) { |
102 | case htons(ETH_P_IP): | |
8ef2a9a5 YH |
103 | ip.u.ip4 = ip_hdr(skb)->daddr; |
104 | break; | |
105 | default: | |
106 | return NULL; | |
eb1d1641 HX |
107 | } |
108 | ||
8ef2a9a5 | 109 | return br_mdb_ip_get(mdb, &ip); |
eb1d1641 HX |
110 | } |
111 | ||
112 | static void br_mdb_free(struct rcu_head *head) | |
113 | { | |
114 | struct net_bridge_mdb_htable *mdb = | |
115 | container_of(head, struct net_bridge_mdb_htable, rcu); | |
116 | struct net_bridge_mdb_htable *old = mdb->old; | |
117 | ||
118 | mdb->old = NULL; | |
119 | kfree(old->mhash); | |
120 | kfree(old); | |
121 | } | |
122 | ||
123 | static int br_mdb_copy(struct net_bridge_mdb_htable *new, | |
124 | struct net_bridge_mdb_htable *old, | |
125 | int elasticity) | |
126 | { | |
127 | struct net_bridge_mdb_entry *mp; | |
128 | struct hlist_node *p; | |
129 | int maxlen; | |
130 | int len; | |
131 | int i; | |
132 | ||
133 | for (i = 0; i < old->max; i++) | |
134 | hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver]) | |
135 | hlist_add_head(&mp->hlist[new->ver], | |
8ef2a9a5 | 136 | &new->mhash[br_ip_hash(new, &mp->addr)]); |
eb1d1641 HX |
137 | |
138 | if (!elasticity) | |
139 | return 0; | |
140 | ||
141 | maxlen = 0; | |
142 | for (i = 0; i < new->max; i++) { | |
143 | len = 0; | |
144 | hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver]) | |
145 | len++; | |
146 | if (len > maxlen) | |
147 | maxlen = len; | |
148 | } | |
149 | ||
150 | return maxlen > elasticity ? -EINVAL : 0; | |
151 | } | |
152 | ||
153 | static void br_multicast_free_pg(struct rcu_head *head) | |
154 | { | |
155 | struct net_bridge_port_group *p = | |
156 | container_of(head, struct net_bridge_port_group, rcu); | |
157 | ||
158 | kfree(p); | |
159 | } | |
160 | ||
161 | static void br_multicast_free_group(struct rcu_head *head) | |
162 | { | |
163 | struct net_bridge_mdb_entry *mp = | |
164 | container_of(head, struct net_bridge_mdb_entry, rcu); | |
165 | ||
166 | kfree(mp); | |
167 | } | |
168 | ||
169 | static void br_multicast_group_expired(unsigned long data) | |
170 | { | |
171 | struct net_bridge_mdb_entry *mp = (void *)data; | |
172 | struct net_bridge *br = mp->br; | |
173 | struct net_bridge_mdb_htable *mdb; | |
174 | ||
175 | spin_lock(&br->multicast_lock); | |
176 | if (!netif_running(br->dev) || timer_pending(&mp->timer)) | |
177 | goto out; | |
178 | ||
179 | if (!hlist_unhashed(&mp->mglist)) | |
180 | hlist_del_init(&mp->mglist); | |
181 | ||
182 | if (mp->ports) | |
183 | goto out; | |
184 | ||
185 | mdb = br->mdb; | |
186 | hlist_del_rcu(&mp->hlist[mdb->ver]); | |
187 | mdb->size--; | |
188 | ||
189 | del_timer(&mp->query_timer); | |
190 | call_rcu_bh(&mp->rcu, br_multicast_free_group); | |
191 | ||
192 | out: | |
193 | spin_unlock(&br->multicast_lock); | |
194 | } | |
195 | ||
196 | static void br_multicast_del_pg(struct net_bridge *br, | |
197 | struct net_bridge_port_group *pg) | |
198 | { | |
199 | struct net_bridge_mdb_htable *mdb = br->mdb; | |
200 | struct net_bridge_mdb_entry *mp; | |
201 | struct net_bridge_port_group *p; | |
202 | struct net_bridge_port_group **pp; | |
203 | ||
8ef2a9a5 | 204 | mp = br_mdb_ip_get(mdb, &pg->addr); |
eb1d1641 HX |
205 | if (WARN_ON(!mp)) |
206 | return; | |
207 | ||
208 | for (pp = &mp->ports; (p = *pp); pp = &p->next) { | |
209 | if (p != pg) | |
210 | continue; | |
211 | ||
212 | *pp = p->next; | |
213 | hlist_del_init(&p->mglist); | |
214 | del_timer(&p->timer); | |
215 | del_timer(&p->query_timer); | |
216 | call_rcu_bh(&p->rcu, br_multicast_free_pg); | |
217 | ||
218 | if (!mp->ports && hlist_unhashed(&mp->mglist) && | |
219 | netif_running(br->dev)) | |
220 | mod_timer(&mp->timer, jiffies); | |
221 | ||
222 | return; | |
223 | } | |
224 | ||
225 | WARN_ON(1); | |
226 | } | |
227 | ||
228 | static void br_multicast_port_group_expired(unsigned long data) | |
229 | { | |
230 | struct net_bridge_port_group *pg = (void *)data; | |
231 | struct net_bridge *br = pg->port->br; | |
232 | ||
233 | spin_lock(&br->multicast_lock); | |
234 | if (!netif_running(br->dev) || timer_pending(&pg->timer) || | |
235 | hlist_unhashed(&pg->mglist)) | |
236 | goto out; | |
237 | ||
238 | br_multicast_del_pg(br, pg); | |
239 | ||
240 | out: | |
241 | spin_unlock(&br->multicast_lock); | |
242 | } | |
243 | ||
244 | static int br_mdb_rehash(struct net_bridge_mdb_htable **mdbp, int max, | |
245 | int elasticity) | |
246 | { | |
247 | struct net_bridge_mdb_htable *old = *mdbp; | |
248 | struct net_bridge_mdb_htable *mdb; | |
249 | int err; | |
250 | ||
251 | mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC); | |
252 | if (!mdb) | |
253 | return -ENOMEM; | |
254 | ||
255 | mdb->max = max; | |
256 | mdb->old = old; | |
257 | ||
258 | mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC); | |
259 | if (!mdb->mhash) { | |
260 | kfree(mdb); | |
261 | return -ENOMEM; | |
262 | } | |
263 | ||
264 | mdb->size = old ? old->size : 0; | |
265 | mdb->ver = old ? old->ver ^ 1 : 0; | |
266 | ||
267 | if (!old || elasticity) | |
268 | get_random_bytes(&mdb->secret, sizeof(mdb->secret)); | |
269 | else | |
270 | mdb->secret = old->secret; | |
271 | ||
272 | if (!old) | |
273 | goto out; | |
274 | ||
275 | err = br_mdb_copy(mdb, old, elasticity); | |
276 | if (err) { | |
277 | kfree(mdb->mhash); | |
278 | kfree(mdb); | |
279 | return err; | |
280 | } | |
281 | ||
282 | call_rcu_bh(&mdb->rcu, br_mdb_free); | |
283 | ||
284 | out: | |
285 | rcu_assign_pointer(*mdbp, mdb); | |
286 | ||
287 | return 0; | |
288 | } | |
289 | ||
8ef2a9a5 YH |
290 | static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br, |
291 | __be32 group) | |
eb1d1641 HX |
292 | { |
293 | struct sk_buff *skb; | |
294 | struct igmphdr *ih; | |
295 | struct ethhdr *eth; | |
296 | struct iphdr *iph; | |
297 | ||
298 | skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) + | |
299 | sizeof(*ih) + 4); | |
300 | if (!skb) | |
301 | goto out; | |
302 | ||
303 | skb->protocol = htons(ETH_P_IP); | |
304 | ||
305 | skb_reset_mac_header(skb); | |
306 | eth = eth_hdr(skb); | |
307 | ||
308 | memcpy(eth->h_source, br->dev->dev_addr, 6); | |
309 | eth->h_dest[0] = 1; | |
310 | eth->h_dest[1] = 0; | |
311 | eth->h_dest[2] = 0x5e; | |
312 | eth->h_dest[3] = 0; | |
313 | eth->h_dest[4] = 0; | |
314 | eth->h_dest[5] = 1; | |
315 | eth->h_proto = htons(ETH_P_IP); | |
316 | skb_put(skb, sizeof(*eth)); | |
317 | ||
318 | skb_set_network_header(skb, skb->len); | |
319 | iph = ip_hdr(skb); | |
320 | ||
321 | iph->version = 4; | |
322 | iph->ihl = 6; | |
323 | iph->tos = 0xc0; | |
324 | iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4); | |
325 | iph->id = 0; | |
326 | iph->frag_off = htons(IP_DF); | |
327 | iph->ttl = 1; | |
328 | iph->protocol = IPPROTO_IGMP; | |
329 | iph->saddr = 0; | |
330 | iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); | |
331 | ((u8 *)&iph[1])[0] = IPOPT_RA; | |
332 | ((u8 *)&iph[1])[1] = 4; | |
333 | ((u8 *)&iph[1])[2] = 0; | |
334 | ((u8 *)&iph[1])[3] = 0; | |
335 | ip_send_check(iph); | |
336 | skb_put(skb, 24); | |
337 | ||
338 | skb_set_transport_header(skb, skb->len); | |
339 | ih = igmp_hdr(skb); | |
340 | ih->type = IGMP_HOST_MEMBERSHIP_QUERY; | |
341 | ih->code = (group ? br->multicast_last_member_interval : | |
342 | br->multicast_query_response_interval) / | |
343 | (HZ / IGMP_TIMER_SCALE); | |
344 | ih->group = group; | |
345 | ih->csum = 0; | |
346 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
347 | skb_put(skb, sizeof(*ih)); | |
348 | ||
349 | __skb_pull(skb, sizeof(*eth)); | |
350 | ||
351 | out: | |
352 | return skb; | |
353 | } | |
354 | ||
8ef2a9a5 YH |
355 | static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, |
356 | struct br_ip *addr) | |
357 | { | |
358 | switch (addr->proto) { | |
359 | case htons(ETH_P_IP): | |
360 | return br_ip4_multicast_alloc_query(br, addr->u.ip4); | |
361 | } | |
362 | return NULL; | |
363 | } | |
364 | ||
eb1d1641 HX |
365 | static void br_multicast_send_group_query(struct net_bridge_mdb_entry *mp) |
366 | { | |
367 | struct net_bridge *br = mp->br; | |
368 | struct sk_buff *skb; | |
369 | ||
8ef2a9a5 | 370 | skb = br_multicast_alloc_query(br, &mp->addr); |
eb1d1641 HX |
371 | if (!skb) |
372 | goto timer; | |
373 | ||
374 | netif_rx(skb); | |
375 | ||
376 | timer: | |
377 | if (++mp->queries_sent < br->multicast_last_member_count) | |
378 | mod_timer(&mp->query_timer, | |
379 | jiffies + br->multicast_last_member_interval); | |
380 | } | |
381 | ||
382 | static void br_multicast_group_query_expired(unsigned long data) | |
383 | { | |
384 | struct net_bridge_mdb_entry *mp = (void *)data; | |
385 | struct net_bridge *br = mp->br; | |
386 | ||
387 | spin_lock(&br->multicast_lock); | |
388 | if (!netif_running(br->dev) || hlist_unhashed(&mp->mglist) || | |
389 | mp->queries_sent >= br->multicast_last_member_count) | |
390 | goto out; | |
391 | ||
392 | br_multicast_send_group_query(mp); | |
393 | ||
394 | out: | |
395 | spin_unlock(&br->multicast_lock); | |
396 | } | |
397 | ||
398 | static void br_multicast_send_port_group_query(struct net_bridge_port_group *pg) | |
399 | { | |
400 | struct net_bridge_port *port = pg->port; | |
401 | struct net_bridge *br = port->br; | |
402 | struct sk_buff *skb; | |
403 | ||
8ef2a9a5 | 404 | skb = br_multicast_alloc_query(br, &pg->addr); |
eb1d1641 HX |
405 | if (!skb) |
406 | goto timer; | |
407 | ||
408 | br_deliver(port, skb); | |
409 | ||
410 | timer: | |
411 | if (++pg->queries_sent < br->multicast_last_member_count) | |
412 | mod_timer(&pg->query_timer, | |
413 | jiffies + br->multicast_last_member_interval); | |
414 | } | |
415 | ||
416 | static void br_multicast_port_group_query_expired(unsigned long data) | |
417 | { | |
418 | struct net_bridge_port_group *pg = (void *)data; | |
419 | struct net_bridge_port *port = pg->port; | |
420 | struct net_bridge *br = port->br; | |
421 | ||
422 | spin_lock(&br->multicast_lock); | |
423 | if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) || | |
424 | pg->queries_sent >= br->multicast_last_member_count) | |
425 | goto out; | |
426 | ||
427 | br_multicast_send_port_group_query(pg); | |
428 | ||
429 | out: | |
430 | spin_unlock(&br->multicast_lock); | |
431 | } | |
432 | ||
433 | static struct net_bridge_mdb_entry *br_multicast_get_group( | |
8ef2a9a5 YH |
434 | struct net_bridge *br, struct net_bridge_port *port, |
435 | struct br_ip *group, int hash) | |
eb1d1641 HX |
436 | { |
437 | struct net_bridge_mdb_htable *mdb = br->mdb; | |
438 | struct net_bridge_mdb_entry *mp; | |
439 | struct hlist_node *p; | |
440 | unsigned count = 0; | |
441 | unsigned max; | |
442 | int elasticity; | |
443 | int err; | |
444 | ||
445 | hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) { | |
446 | count++; | |
8ef2a9a5 | 447 | if (unlikely(br_ip_equal(group, &mp->addr))) |
eb1d1641 | 448 | return mp; |
eb1d1641 HX |
449 | } |
450 | ||
451 | elasticity = 0; | |
452 | max = mdb->max; | |
453 | ||
454 | if (unlikely(count > br->hash_elasticity && count)) { | |
455 | if (net_ratelimit()) | |
456 | printk(KERN_INFO "%s: Multicast hash table " | |
457 | "chain limit reached: %s\n", | |
458 | br->dev->name, port ? port->dev->name : | |
459 | br->dev->name); | |
460 | ||
461 | elasticity = br->hash_elasticity; | |
462 | } | |
463 | ||
464 | if (mdb->size >= max) { | |
465 | max *= 2; | |
466 | if (unlikely(max >= br->hash_max)) { | |
467 | printk(KERN_WARNING "%s: Multicast hash table maximum " | |
468 | "reached, disabling snooping: %s, %d\n", | |
469 | br->dev->name, port ? port->dev->name : | |
470 | br->dev->name, | |
471 | max); | |
472 | err = -E2BIG; | |
473 | disable: | |
474 | br->multicast_disabled = 1; | |
475 | goto err; | |
476 | } | |
477 | } | |
478 | ||
479 | if (max > mdb->max || elasticity) { | |
480 | if (mdb->old) { | |
481 | if (net_ratelimit()) | |
482 | printk(KERN_INFO "%s: Multicast hash table " | |
483 | "on fire: %s\n", | |
484 | br->dev->name, port ? port->dev->name : | |
485 | br->dev->name); | |
486 | err = -EEXIST; | |
487 | goto err; | |
488 | } | |
489 | ||
490 | err = br_mdb_rehash(&br->mdb, max, elasticity); | |
491 | if (err) { | |
492 | printk(KERN_WARNING "%s: Cannot rehash multicast " | |
493 | "hash table, disabling snooping: " | |
494 | "%s, %d, %d\n", | |
495 | br->dev->name, port ? port->dev->name : | |
496 | br->dev->name, | |
497 | mdb->size, err); | |
498 | goto disable; | |
499 | } | |
500 | ||
501 | err = -EAGAIN; | |
502 | goto err; | |
503 | } | |
504 | ||
505 | return NULL; | |
506 | ||
507 | err: | |
508 | mp = ERR_PTR(err); | |
509 | return mp; | |
510 | } | |
511 | ||
512 | static struct net_bridge_mdb_entry *br_multicast_new_group( | |
8ef2a9a5 YH |
513 | struct net_bridge *br, struct net_bridge_port *port, |
514 | struct br_ip *group) | |
eb1d1641 HX |
515 | { |
516 | struct net_bridge_mdb_htable *mdb = br->mdb; | |
517 | struct net_bridge_mdb_entry *mp; | |
518 | int hash; | |
519 | ||
520 | if (!mdb) { | |
521 | if (br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0)) | |
522 | return NULL; | |
523 | goto rehash; | |
524 | } | |
525 | ||
526 | hash = br_ip_hash(mdb, group); | |
527 | mp = br_multicast_get_group(br, port, group, hash); | |
528 | switch (PTR_ERR(mp)) { | |
529 | case 0: | |
530 | break; | |
531 | ||
532 | case -EAGAIN: | |
533 | rehash: | |
534 | mdb = br->mdb; | |
535 | hash = br_ip_hash(mdb, group); | |
536 | break; | |
537 | ||
538 | default: | |
539 | goto out; | |
540 | } | |
541 | ||
542 | mp = kzalloc(sizeof(*mp), GFP_ATOMIC); | |
543 | if (unlikely(!mp)) | |
544 | goto out; | |
545 | ||
546 | mp->br = br; | |
8ef2a9a5 | 547 | mp->addr = *group; |
eb1d1641 HX |
548 | setup_timer(&mp->timer, br_multicast_group_expired, |
549 | (unsigned long)mp); | |
550 | setup_timer(&mp->query_timer, br_multicast_group_query_expired, | |
551 | (unsigned long)mp); | |
552 | ||
553 | hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]); | |
554 | mdb->size++; | |
555 | ||
556 | out: | |
557 | return mp; | |
558 | } | |
559 | ||
560 | static int br_multicast_add_group(struct net_bridge *br, | |
8ef2a9a5 YH |
561 | struct net_bridge_port *port, |
562 | struct br_ip *group) | |
eb1d1641 HX |
563 | { |
564 | struct net_bridge_mdb_entry *mp; | |
565 | struct net_bridge_port_group *p; | |
566 | struct net_bridge_port_group **pp; | |
567 | unsigned long now = jiffies; | |
568 | int err; | |
569 | ||
eb1d1641 HX |
570 | spin_lock(&br->multicast_lock); |
571 | if (!netif_running(br->dev) || | |
572 | (port && port->state == BR_STATE_DISABLED)) | |
573 | goto out; | |
574 | ||
575 | mp = br_multicast_new_group(br, port, group); | |
576 | err = PTR_ERR(mp); | |
577 | if (unlikely(IS_ERR(mp) || !mp)) | |
578 | goto err; | |
579 | ||
580 | if (!port) { | |
581 | hlist_add_head(&mp->mglist, &br->mglist); | |
582 | mod_timer(&mp->timer, now + br->multicast_membership_interval); | |
583 | goto out; | |
584 | } | |
585 | ||
586 | for (pp = &mp->ports; (p = *pp); pp = &p->next) { | |
587 | if (p->port == port) | |
588 | goto found; | |
589 | if ((unsigned long)p->port < (unsigned long)port) | |
590 | break; | |
591 | } | |
592 | ||
593 | p = kzalloc(sizeof(*p), GFP_ATOMIC); | |
594 | err = -ENOMEM; | |
595 | if (unlikely(!p)) | |
596 | goto err; | |
597 | ||
8ef2a9a5 | 598 | p->addr = *group; |
eb1d1641 HX |
599 | p->port = port; |
600 | p->next = *pp; | |
601 | hlist_add_head(&p->mglist, &port->mglist); | |
602 | setup_timer(&p->timer, br_multicast_port_group_expired, | |
603 | (unsigned long)p); | |
604 | setup_timer(&p->query_timer, br_multicast_port_group_query_expired, | |
605 | (unsigned long)p); | |
606 | ||
607 | rcu_assign_pointer(*pp, p); | |
608 | ||
609 | found: | |
610 | mod_timer(&p->timer, now + br->multicast_membership_interval); | |
611 | out: | |
612 | err = 0; | |
613 | ||
614 | err: | |
615 | spin_unlock(&br->multicast_lock); | |
616 | return err; | |
617 | } | |
618 | ||
8ef2a9a5 YH |
619 | static int br_ip4_multicast_add_group(struct net_bridge *br, |
620 | struct net_bridge_port *port, | |
621 | __be32 group) | |
622 | { | |
623 | struct br_ip br_group; | |
624 | ||
625 | if (ipv4_is_local_multicast(group)) | |
626 | return 0; | |
627 | ||
628 | br_group.u.ip4 = group; | |
629 | br_group.proto = htons(ETH_P_IP); | |
630 | ||
631 | return br_multicast_add_group(br, port, &br_group); | |
632 | } | |
633 | ||
eb1d1641 HX |
634 | static void br_multicast_router_expired(unsigned long data) |
635 | { | |
636 | struct net_bridge_port *port = (void *)data; | |
637 | struct net_bridge *br = port->br; | |
638 | ||
639 | spin_lock(&br->multicast_lock); | |
640 | if (port->multicast_router != 1 || | |
641 | timer_pending(&port->multicast_router_timer) || | |
642 | hlist_unhashed(&port->rlist)) | |
643 | goto out; | |
644 | ||
645 | hlist_del_init_rcu(&port->rlist); | |
646 | ||
647 | out: | |
648 | spin_unlock(&br->multicast_lock); | |
649 | } | |
650 | ||
651 | static void br_multicast_local_router_expired(unsigned long data) | |
652 | { | |
653 | } | |
654 | ||
8ef2a9a5 YH |
655 | static void __br_multicast_send_query(struct net_bridge *br, |
656 | struct net_bridge_port *port, | |
657 | struct br_ip *ip) | |
eb1d1641 | 658 | { |
eb1d1641 HX |
659 | struct sk_buff *skb; |
660 | ||
8ef2a9a5 | 661 | skb = br_multicast_alloc_query(br, ip); |
eb1d1641 | 662 | if (!skb) |
8ef2a9a5 | 663 | return; |
eb1d1641 HX |
664 | |
665 | if (port) { | |
666 | __skb_push(skb, sizeof(struct ethhdr)); | |
667 | skb->dev = port->dev; | |
668 | NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, | |
669 | dev_queue_xmit); | |
670 | } else | |
671 | netif_rx(skb); | |
8ef2a9a5 YH |
672 | } |
673 | ||
674 | static void br_multicast_send_query(struct net_bridge *br, | |
675 | struct net_bridge_port *port, u32 sent) | |
676 | { | |
677 | unsigned long time; | |
678 | struct br_ip br_group; | |
679 | ||
680 | if (!netif_running(br->dev) || br->multicast_disabled || | |
681 | timer_pending(&br->multicast_querier_timer)) | |
682 | return; | |
683 | ||
684 | br_group.u.ip4 = 0; | |
685 | br_group.proto = htons(ETH_P_IP); | |
686 | ||
687 | __br_multicast_send_query(br, port, &br_group); | |
eb1d1641 | 688 | |
eb1d1641 HX |
689 | time = jiffies; |
690 | time += sent < br->multicast_startup_query_count ? | |
691 | br->multicast_startup_query_interval : | |
692 | br->multicast_query_interval; | |
693 | mod_timer(port ? &port->multicast_query_timer : | |
694 | &br->multicast_query_timer, time); | |
695 | } | |
696 | ||
697 | static void br_multicast_port_query_expired(unsigned long data) | |
698 | { | |
699 | struct net_bridge_port *port = (void *)data; | |
700 | struct net_bridge *br = port->br; | |
701 | ||
702 | spin_lock(&br->multicast_lock); | |
02a780c0 DC |
703 | if (port->state == BR_STATE_DISABLED || |
704 | port->state == BR_STATE_BLOCKING) | |
eb1d1641 HX |
705 | goto out; |
706 | ||
707 | if (port->multicast_startup_queries_sent < | |
708 | br->multicast_startup_query_count) | |
709 | port->multicast_startup_queries_sent++; | |
710 | ||
711 | br_multicast_send_query(port->br, port, | |
712 | port->multicast_startup_queries_sent); | |
713 | ||
714 | out: | |
715 | spin_unlock(&br->multicast_lock); | |
716 | } | |
717 | ||
718 | void br_multicast_add_port(struct net_bridge_port *port) | |
719 | { | |
720 | port->multicast_router = 1; | |
721 | ||
722 | setup_timer(&port->multicast_router_timer, br_multicast_router_expired, | |
723 | (unsigned long)port); | |
724 | setup_timer(&port->multicast_query_timer, | |
725 | br_multicast_port_query_expired, (unsigned long)port); | |
726 | } | |
727 | ||
728 | void br_multicast_del_port(struct net_bridge_port *port) | |
729 | { | |
730 | del_timer_sync(&port->multicast_router_timer); | |
731 | } | |
732 | ||
561f1103 HX |
733 | static void __br_multicast_enable_port(struct net_bridge_port *port) |
734 | { | |
735 | port->multicast_startup_queries_sent = 0; | |
736 | ||
737 | if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 || | |
738 | del_timer(&port->multicast_query_timer)) | |
739 | mod_timer(&port->multicast_query_timer, jiffies); | |
740 | } | |
741 | ||
eb1d1641 HX |
742 | void br_multicast_enable_port(struct net_bridge_port *port) |
743 | { | |
744 | struct net_bridge *br = port->br; | |
745 | ||
746 | spin_lock(&br->multicast_lock); | |
747 | if (br->multicast_disabled || !netif_running(br->dev)) | |
748 | goto out; | |
749 | ||
561f1103 | 750 | __br_multicast_enable_port(port); |
eb1d1641 HX |
751 | |
752 | out: | |
753 | spin_unlock(&br->multicast_lock); | |
754 | } | |
755 | ||
756 | void br_multicast_disable_port(struct net_bridge_port *port) | |
757 | { | |
758 | struct net_bridge *br = port->br; | |
759 | struct net_bridge_port_group *pg; | |
760 | struct hlist_node *p, *n; | |
761 | ||
762 | spin_lock(&br->multicast_lock); | |
763 | hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist) | |
764 | br_multicast_del_pg(br, pg); | |
765 | ||
766 | if (!hlist_unhashed(&port->rlist)) | |
767 | hlist_del_init_rcu(&port->rlist); | |
768 | del_timer(&port->multicast_router_timer); | |
769 | del_timer(&port->multicast_query_timer); | |
770 | spin_unlock(&br->multicast_lock); | |
771 | } | |
772 | ||
8ef2a9a5 YH |
773 | static int br_ip4_multicast_igmp3_report(struct net_bridge *br, |
774 | struct net_bridge_port *port, | |
775 | struct sk_buff *skb) | |
eb1d1641 HX |
776 | { |
777 | struct igmpv3_report *ih; | |
778 | struct igmpv3_grec *grec; | |
779 | int i; | |
780 | int len; | |
781 | int num; | |
782 | int type; | |
783 | int err = 0; | |
784 | __be32 group; | |
785 | ||
786 | if (!pskb_may_pull(skb, sizeof(*ih))) | |
787 | return -EINVAL; | |
788 | ||
789 | ih = igmpv3_report_hdr(skb); | |
790 | num = ntohs(ih->ngrec); | |
791 | len = sizeof(*ih); | |
792 | ||
793 | for (i = 0; i < num; i++) { | |
794 | len += sizeof(*grec); | |
795 | if (!pskb_may_pull(skb, len)) | |
796 | return -EINVAL; | |
797 | ||
fd218cf9 | 798 | grec = (void *)(skb->data + len - sizeof(*grec)); |
eb1d1641 HX |
799 | group = grec->grec_mca; |
800 | type = grec->grec_type; | |
801 | ||
8eabf95c | 802 | len += ntohs(grec->grec_nsrcs) * 4; |
eb1d1641 HX |
803 | if (!pskb_may_pull(skb, len)) |
804 | return -EINVAL; | |
805 | ||
806 | /* We treat this as an IGMPv2 report for now. */ | |
807 | switch (type) { | |
808 | case IGMPV3_MODE_IS_INCLUDE: | |
809 | case IGMPV3_MODE_IS_EXCLUDE: | |
810 | case IGMPV3_CHANGE_TO_INCLUDE: | |
811 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
812 | case IGMPV3_ALLOW_NEW_SOURCES: | |
813 | case IGMPV3_BLOCK_OLD_SOURCES: | |
814 | break; | |
815 | ||
816 | default: | |
817 | continue; | |
818 | } | |
819 | ||
8ef2a9a5 | 820 | err = br_ip4_multicast_add_group(br, port, group); |
eb1d1641 HX |
821 | if (err) |
822 | break; | |
823 | } | |
824 | ||
825 | return err; | |
826 | } | |
827 | ||
0909e117 HX |
828 | static void br_multicast_add_router(struct net_bridge *br, |
829 | struct net_bridge_port *port) | |
830 | { | |
831 | struct hlist_node *p; | |
832 | struct hlist_node **h; | |
833 | ||
834 | for (h = &br->router_list.first; | |
835 | (p = *h) && | |
836 | (unsigned long)container_of(p, struct net_bridge_port, rlist) > | |
837 | (unsigned long)port; | |
838 | h = &p->next) | |
839 | ; | |
840 | ||
841 | port->rlist.pprev = h; | |
842 | port->rlist.next = p; | |
843 | rcu_assign_pointer(*h, &port->rlist); | |
844 | if (p) | |
845 | p->pprev = &port->rlist.next; | |
846 | } | |
847 | ||
eb1d1641 HX |
848 | static void br_multicast_mark_router(struct net_bridge *br, |
849 | struct net_bridge_port *port) | |
850 | { | |
851 | unsigned long now = jiffies; | |
eb1d1641 HX |
852 | |
853 | if (!port) { | |
854 | if (br->multicast_router == 1) | |
855 | mod_timer(&br->multicast_router_timer, | |
856 | now + br->multicast_querier_interval); | |
857 | return; | |
858 | } | |
859 | ||
860 | if (port->multicast_router != 1) | |
861 | return; | |
862 | ||
863 | if (!hlist_unhashed(&port->rlist)) | |
864 | goto timer; | |
865 | ||
0909e117 | 866 | br_multicast_add_router(br, port); |
eb1d1641 HX |
867 | |
868 | timer: | |
869 | mod_timer(&port->multicast_router_timer, | |
870 | now + br->multicast_querier_interval); | |
871 | } | |
872 | ||
873 | static void br_multicast_query_received(struct net_bridge *br, | |
874 | struct net_bridge_port *port, | |
8ef2a9a5 | 875 | int saddr) |
eb1d1641 HX |
876 | { |
877 | if (saddr) | |
878 | mod_timer(&br->multicast_querier_timer, | |
879 | jiffies + br->multicast_querier_interval); | |
880 | else if (timer_pending(&br->multicast_querier_timer)) | |
881 | return; | |
882 | ||
883 | br_multicast_mark_router(br, port); | |
884 | } | |
885 | ||
8ef2a9a5 YH |
886 | static int br_ip4_multicast_query(struct net_bridge *br, |
887 | struct net_bridge_port *port, | |
888 | struct sk_buff *skb) | |
eb1d1641 HX |
889 | { |
890 | struct iphdr *iph = ip_hdr(skb); | |
891 | struct igmphdr *ih = igmp_hdr(skb); | |
892 | struct net_bridge_mdb_entry *mp; | |
893 | struct igmpv3_query *ih3; | |
894 | struct net_bridge_port_group *p; | |
895 | struct net_bridge_port_group **pp; | |
896 | unsigned long max_delay; | |
897 | unsigned long now = jiffies; | |
898 | __be32 group; | |
bec68ff1 | 899 | int err = 0; |
eb1d1641 HX |
900 | |
901 | spin_lock(&br->multicast_lock); | |
902 | if (!netif_running(br->dev) || | |
903 | (port && port->state == BR_STATE_DISABLED)) | |
904 | goto out; | |
905 | ||
8ef2a9a5 | 906 | br_multicast_query_received(br, port, !!iph->saddr); |
eb1d1641 HX |
907 | |
908 | group = ih->group; | |
909 | ||
910 | if (skb->len == sizeof(*ih)) { | |
911 | max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); | |
912 | ||
913 | if (!max_delay) { | |
914 | max_delay = 10 * HZ; | |
915 | group = 0; | |
916 | } | |
917 | } else { | |
bec68ff1 YH |
918 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) { |
919 | err = -EINVAL; | |
920 | goto out; | |
921 | } | |
eb1d1641 HX |
922 | |
923 | ih3 = igmpv3_query_hdr(skb); | |
924 | if (ih3->nsrcs) | |
bec68ff1 | 925 | goto out; |
eb1d1641 | 926 | |
0ba8c9ec YH |
927 | max_delay = ih3->code ? |
928 | IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; | |
eb1d1641 HX |
929 | } |
930 | ||
931 | if (!group) | |
932 | goto out; | |
933 | ||
8ef2a9a5 | 934 | mp = br_mdb_ip4_get(br->mdb, group); |
eb1d1641 HX |
935 | if (!mp) |
936 | goto out; | |
937 | ||
938 | max_delay *= br->multicast_last_member_count; | |
939 | ||
940 | if (!hlist_unhashed(&mp->mglist) && | |
941 | (timer_pending(&mp->timer) ? | |
942 | time_after(mp->timer.expires, now + max_delay) : | |
943 | try_to_del_timer_sync(&mp->timer) >= 0)) | |
944 | mod_timer(&mp->timer, now + max_delay); | |
945 | ||
946 | for (pp = &mp->ports; (p = *pp); pp = &p->next) { | |
947 | if (timer_pending(&p->timer) ? | |
948 | time_after(p->timer.expires, now + max_delay) : | |
949 | try_to_del_timer_sync(&p->timer) >= 0) | |
950 | mod_timer(&mp->timer, now + max_delay); | |
951 | } | |
952 | ||
953 | out: | |
954 | spin_unlock(&br->multicast_lock); | |
bec68ff1 | 955 | return err; |
eb1d1641 HX |
956 | } |
957 | ||
958 | static void br_multicast_leave_group(struct net_bridge *br, | |
959 | struct net_bridge_port *port, | |
8ef2a9a5 | 960 | struct br_ip *group) |
eb1d1641 HX |
961 | { |
962 | struct net_bridge_mdb_htable *mdb; | |
963 | struct net_bridge_mdb_entry *mp; | |
964 | struct net_bridge_port_group *p; | |
965 | unsigned long now; | |
966 | unsigned long time; | |
967 | ||
eb1d1641 HX |
968 | spin_lock(&br->multicast_lock); |
969 | if (!netif_running(br->dev) || | |
970 | (port && port->state == BR_STATE_DISABLED) || | |
971 | timer_pending(&br->multicast_querier_timer)) | |
972 | goto out; | |
973 | ||
974 | mdb = br->mdb; | |
975 | mp = br_mdb_ip_get(mdb, group); | |
976 | if (!mp) | |
977 | goto out; | |
978 | ||
979 | now = jiffies; | |
980 | time = now + br->multicast_last_member_count * | |
981 | br->multicast_last_member_interval; | |
982 | ||
983 | if (!port) { | |
984 | if (!hlist_unhashed(&mp->mglist) && | |
985 | (timer_pending(&mp->timer) ? | |
986 | time_after(mp->timer.expires, time) : | |
987 | try_to_del_timer_sync(&mp->timer) >= 0)) { | |
988 | mod_timer(&mp->timer, time); | |
989 | ||
990 | mp->queries_sent = 0; | |
991 | mod_timer(&mp->query_timer, now); | |
992 | } | |
993 | ||
994 | goto out; | |
995 | } | |
996 | ||
997 | for (p = mp->ports; p; p = p->next) { | |
998 | if (p->port != port) | |
999 | continue; | |
1000 | ||
1001 | if (!hlist_unhashed(&p->mglist) && | |
1002 | (timer_pending(&p->timer) ? | |
1003 | time_after(p->timer.expires, time) : | |
1004 | try_to_del_timer_sync(&p->timer) >= 0)) { | |
1005 | mod_timer(&p->timer, time); | |
1006 | ||
1007 | p->queries_sent = 0; | |
1008 | mod_timer(&p->query_timer, now); | |
1009 | } | |
1010 | ||
1011 | break; | |
1012 | } | |
1013 | ||
1014 | out: | |
1015 | spin_unlock(&br->multicast_lock); | |
1016 | } | |
1017 | ||
8ef2a9a5 YH |
1018 | static void br_ip4_multicast_leave_group(struct net_bridge *br, |
1019 | struct net_bridge_port *port, | |
1020 | __be32 group) | |
1021 | { | |
1022 | struct br_ip br_group; | |
1023 | ||
1024 | if (ipv4_is_local_multicast(group)) | |
1025 | return; | |
1026 | ||
1027 | br_group.u.ip4 = group; | |
1028 | br_group.proto = htons(ETH_P_IP); | |
1029 | ||
1030 | br_multicast_leave_group(br, port, &br_group); | |
1031 | } | |
1032 | ||
1033 | ||
eb1d1641 HX |
1034 | static int br_multicast_ipv4_rcv(struct net_bridge *br, |
1035 | struct net_bridge_port *port, | |
1036 | struct sk_buff *skb) | |
1037 | { | |
1038 | struct sk_buff *skb2 = skb; | |
1039 | struct iphdr *iph; | |
1040 | struct igmphdr *ih; | |
1041 | unsigned len; | |
1042 | unsigned offset; | |
1043 | int err; | |
1044 | ||
1045 | BR_INPUT_SKB_CB(skb)->igmp = 0; | |
1046 | BR_INPUT_SKB_CB(skb)->mrouters_only = 0; | |
1047 | ||
1048 | /* We treat OOM as packet loss for now. */ | |
1049 | if (!pskb_may_pull(skb, sizeof(*iph))) | |
1050 | return -EINVAL; | |
1051 | ||
1052 | iph = ip_hdr(skb); | |
1053 | ||
1054 | if (iph->ihl < 5 || iph->version != 4) | |
1055 | return -EINVAL; | |
1056 | ||
1057 | if (!pskb_may_pull(skb, ip_hdrlen(skb))) | |
1058 | return -EINVAL; | |
1059 | ||
1060 | iph = ip_hdr(skb); | |
1061 | ||
1062 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
1063 | return -EINVAL; | |
1064 | ||
1065 | if (iph->protocol != IPPROTO_IGMP) | |
1066 | return 0; | |
1067 | ||
1068 | len = ntohs(iph->tot_len); | |
1069 | if (skb->len < len || len < ip_hdrlen(skb)) | |
1070 | return -EINVAL; | |
1071 | ||
1072 | if (skb->len > len) { | |
1073 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1074 | if (!skb2) | |
1075 | return -ENOMEM; | |
1076 | ||
1077 | err = pskb_trim_rcsum(skb2, len); | |
1078 | if (err) | |
8440853b | 1079 | goto err_out; |
eb1d1641 HX |
1080 | } |
1081 | ||
1082 | len -= ip_hdrlen(skb2); | |
1083 | offset = skb_network_offset(skb2) + ip_hdrlen(skb2); | |
1084 | __skb_pull(skb2, offset); | |
1085 | skb_reset_transport_header(skb2); | |
1086 | ||
1087 | err = -EINVAL; | |
1088 | if (!pskb_may_pull(skb2, sizeof(*ih))) | |
1089 | goto out; | |
1090 | ||
eb1d1641 HX |
1091 | switch (skb2->ip_summed) { |
1092 | case CHECKSUM_COMPLETE: | |
1093 | if (!csum_fold(skb2->csum)) | |
1094 | break; | |
1095 | /* fall through */ | |
1096 | case CHECKSUM_NONE: | |
1097 | skb2->csum = 0; | |
1098 | if (skb_checksum_complete(skb2)) | |
8440853b | 1099 | goto out; |
eb1d1641 HX |
1100 | } |
1101 | ||
1102 | err = 0; | |
1103 | ||
1104 | BR_INPUT_SKB_CB(skb)->igmp = 1; | |
1105 | ih = igmp_hdr(skb2); | |
1106 | ||
1107 | switch (ih->type) { | |
1108 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1109 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1110 | BR_INPUT_SKB_CB(skb2)->mrouters_only = 1; | |
8ef2a9a5 | 1111 | err = br_ip4_multicast_add_group(br, port, ih->group); |
eb1d1641 HX |
1112 | break; |
1113 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
8ef2a9a5 | 1114 | err = br_ip4_multicast_igmp3_report(br, port, skb2); |
eb1d1641 HX |
1115 | break; |
1116 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
8ef2a9a5 | 1117 | err = br_ip4_multicast_query(br, port, skb2); |
eb1d1641 HX |
1118 | break; |
1119 | case IGMP_HOST_LEAVE_MESSAGE: | |
8ef2a9a5 | 1120 | br_ip4_multicast_leave_group(br, port, ih->group); |
eb1d1641 HX |
1121 | break; |
1122 | } | |
1123 | ||
1124 | out: | |
1125 | __skb_push(skb2, offset); | |
8440853b | 1126 | err_out: |
eb1d1641 HX |
1127 | if (skb2 != skb) |
1128 | kfree_skb(skb2); | |
1129 | return err; | |
1130 | } | |
1131 | ||
1132 | int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, | |
1133 | struct sk_buff *skb) | |
1134 | { | |
1135 | if (br->multicast_disabled) | |
1136 | return 0; | |
1137 | ||
1138 | switch (skb->protocol) { | |
1139 | case htons(ETH_P_IP): | |
1140 | return br_multicast_ipv4_rcv(br, port, skb); | |
1141 | } | |
1142 | ||
1143 | return 0; | |
1144 | } | |
1145 | ||
1146 | static void br_multicast_query_expired(unsigned long data) | |
1147 | { | |
1148 | struct net_bridge *br = (void *)data; | |
1149 | ||
1150 | spin_lock(&br->multicast_lock); | |
1151 | if (br->multicast_startup_queries_sent < | |
1152 | br->multicast_startup_query_count) | |
1153 | br->multicast_startup_queries_sent++; | |
1154 | ||
1155 | br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent); | |
1156 | ||
1157 | spin_unlock(&br->multicast_lock); | |
1158 | } | |
1159 | ||
1160 | void br_multicast_init(struct net_bridge *br) | |
1161 | { | |
1162 | br->hash_elasticity = 4; | |
1163 | br->hash_max = 512; | |
1164 | ||
1165 | br->multicast_router = 1; | |
1166 | br->multicast_last_member_count = 2; | |
1167 | br->multicast_startup_query_count = 2; | |
1168 | ||
1169 | br->multicast_last_member_interval = HZ; | |
1170 | br->multicast_query_response_interval = 10 * HZ; | |
1171 | br->multicast_startup_query_interval = 125 * HZ / 4; | |
1172 | br->multicast_query_interval = 125 * HZ; | |
1173 | br->multicast_querier_interval = 255 * HZ; | |
1174 | br->multicast_membership_interval = 260 * HZ; | |
1175 | ||
1176 | spin_lock_init(&br->multicast_lock); | |
1177 | setup_timer(&br->multicast_router_timer, | |
1178 | br_multicast_local_router_expired, 0); | |
1179 | setup_timer(&br->multicast_querier_timer, | |
1180 | br_multicast_local_router_expired, 0); | |
1181 | setup_timer(&br->multicast_query_timer, br_multicast_query_expired, | |
1182 | (unsigned long)br); | |
1183 | } | |
1184 | ||
1185 | void br_multicast_open(struct net_bridge *br) | |
1186 | { | |
1187 | br->multicast_startup_queries_sent = 0; | |
1188 | ||
1189 | if (br->multicast_disabled) | |
1190 | return; | |
1191 | ||
1192 | mod_timer(&br->multicast_query_timer, jiffies); | |
1193 | } | |
1194 | ||
1195 | void br_multicast_stop(struct net_bridge *br) | |
1196 | { | |
1197 | struct net_bridge_mdb_htable *mdb; | |
1198 | struct net_bridge_mdb_entry *mp; | |
1199 | struct hlist_node *p, *n; | |
1200 | u32 ver; | |
1201 | int i; | |
1202 | ||
1203 | del_timer_sync(&br->multicast_router_timer); | |
1204 | del_timer_sync(&br->multicast_querier_timer); | |
1205 | del_timer_sync(&br->multicast_query_timer); | |
1206 | ||
1207 | spin_lock_bh(&br->multicast_lock); | |
1208 | mdb = br->mdb; | |
1209 | if (!mdb) | |
1210 | goto out; | |
1211 | ||
1212 | br->mdb = NULL; | |
1213 | ||
1214 | ver = mdb->ver; | |
1215 | for (i = 0; i < mdb->max; i++) { | |
1216 | hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i], | |
1217 | hlist[ver]) { | |
1218 | del_timer(&mp->timer); | |
1219 | del_timer(&mp->query_timer); | |
1220 | call_rcu_bh(&mp->rcu, br_multicast_free_group); | |
1221 | } | |
1222 | } | |
1223 | ||
1224 | if (mdb->old) { | |
1225 | spin_unlock_bh(&br->multicast_lock); | |
10cc2b50 | 1226 | rcu_barrier_bh(); |
eb1d1641 HX |
1227 | spin_lock_bh(&br->multicast_lock); |
1228 | WARN_ON(mdb->old); | |
1229 | } | |
1230 | ||
1231 | mdb->old = mdb; | |
1232 | call_rcu_bh(&mdb->rcu, br_mdb_free); | |
1233 | ||
1234 | out: | |
1235 | spin_unlock_bh(&br->multicast_lock); | |
1236 | } | |
0909e117 HX |
1237 | |
1238 | int br_multicast_set_router(struct net_bridge *br, unsigned long val) | |
1239 | { | |
1240 | int err = -ENOENT; | |
1241 | ||
1242 | spin_lock_bh(&br->multicast_lock); | |
1243 | if (!netif_running(br->dev)) | |
1244 | goto unlock; | |
1245 | ||
1246 | switch (val) { | |
1247 | case 0: | |
1248 | case 2: | |
1249 | del_timer(&br->multicast_router_timer); | |
1250 | /* fall through */ | |
1251 | case 1: | |
1252 | br->multicast_router = val; | |
1253 | err = 0; | |
1254 | break; | |
1255 | ||
1256 | default: | |
1257 | err = -EINVAL; | |
1258 | break; | |
1259 | } | |
1260 | ||
1261 | unlock: | |
1262 | spin_unlock_bh(&br->multicast_lock); | |
1263 | ||
1264 | return err; | |
1265 | } | |
1266 | ||
1267 | int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) | |
1268 | { | |
1269 | struct net_bridge *br = p->br; | |
1270 | int err = -ENOENT; | |
1271 | ||
1272 | spin_lock(&br->multicast_lock); | |
1273 | if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED) | |
1274 | goto unlock; | |
1275 | ||
1276 | switch (val) { | |
1277 | case 0: | |
1278 | case 1: | |
1279 | case 2: | |
1280 | p->multicast_router = val; | |
1281 | err = 0; | |
1282 | ||
1283 | if (val < 2 && !hlist_unhashed(&p->rlist)) | |
1284 | hlist_del_init_rcu(&p->rlist); | |
1285 | ||
1286 | if (val == 1) | |
1287 | break; | |
1288 | ||
1289 | del_timer(&p->multicast_router_timer); | |
1290 | ||
1291 | if (val == 0) | |
1292 | break; | |
1293 | ||
1294 | br_multicast_add_router(br, p); | |
1295 | break; | |
1296 | ||
1297 | default: | |
1298 | err = -EINVAL; | |
1299 | break; | |
1300 | } | |
1301 | ||
1302 | unlock: | |
1303 | spin_unlock(&br->multicast_lock); | |
1304 | ||
1305 | return err; | |
1306 | } | |
561f1103 HX |
1307 | |
1308 | int br_multicast_toggle(struct net_bridge *br, unsigned long val) | |
1309 | { | |
1310 | struct net_bridge_port *port; | |
1311 | int err = -ENOENT; | |
1312 | ||
1313 | spin_lock(&br->multicast_lock); | |
1314 | if (!netif_running(br->dev)) | |
1315 | goto unlock; | |
1316 | ||
1317 | err = 0; | |
1318 | if (br->multicast_disabled == !val) | |
1319 | goto unlock; | |
1320 | ||
1321 | br->multicast_disabled = !val; | |
1322 | if (br->multicast_disabled) | |
1323 | goto unlock; | |
1324 | ||
1325 | if (br->mdb) { | |
1326 | if (br->mdb->old) { | |
1327 | err = -EEXIST; | |
1328 | rollback: | |
1329 | br->multicast_disabled = !!val; | |
1330 | goto unlock; | |
1331 | } | |
1332 | ||
1333 | err = br_mdb_rehash(&br->mdb, br->mdb->max, | |
1334 | br->hash_elasticity); | |
1335 | if (err) | |
1336 | goto rollback; | |
1337 | } | |
1338 | ||
1339 | br_multicast_open(br); | |
1340 | list_for_each_entry(port, &br->port_list, list) { | |
1341 | if (port->state == BR_STATE_DISABLED || | |
1342 | port->state == BR_STATE_BLOCKING) | |
1343 | continue; | |
1344 | ||
1345 | __br_multicast_enable_port(port); | |
1346 | } | |
1347 | ||
1348 | unlock: | |
1349 | spin_unlock(&br->multicast_lock); | |
1350 | ||
1351 | return err; | |
1352 | } | |
b195167f HX |
1353 | |
1354 | int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) | |
1355 | { | |
1356 | int err = -ENOENT; | |
1357 | u32 old; | |
1358 | ||
1359 | spin_lock(&br->multicast_lock); | |
1360 | if (!netif_running(br->dev)) | |
1361 | goto unlock; | |
1362 | ||
1363 | err = -EINVAL; | |
1364 | if (!is_power_of_2(val)) | |
1365 | goto unlock; | |
1366 | if (br->mdb && val < br->mdb->size) | |
1367 | goto unlock; | |
1368 | ||
1369 | err = 0; | |
1370 | ||
1371 | old = br->hash_max; | |
1372 | br->hash_max = val; | |
1373 | ||
1374 | if (br->mdb) { | |
1375 | if (br->mdb->old) { | |
1376 | err = -EEXIST; | |
1377 | rollback: | |
1378 | br->hash_max = old; | |
1379 | goto unlock; | |
1380 | } | |
1381 | ||
1382 | err = br_mdb_rehash(&br->mdb, br->hash_max, | |
1383 | br->hash_elasticity); | |
1384 | if (err) | |
1385 | goto rollback; | |
1386 | } | |
1387 | ||
1388 | unlock: | |
1389 | spin_unlock(&br->multicast_lock); | |
1390 | ||
1391 | return err; | |
1392 | } |