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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> | |
18 | #include <linux/netdevice.h> | |
19 | #include <linux/netfilter_bridge.h> | |
20 | #include <linux/random.h> | |
21 | #include <linux/rculist.h> | |
22 | #include <linux/skbuff.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/timer.h> | |
25 | #include <net/ip.h> | |
26 | ||
27 | #include "br_private.h" | |
28 | ||
29 | static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb, __be32 ip) | |
30 | { | |
31 | return jhash_1word(mdb->secret, (u32)ip) & (mdb->max - 1); | |
32 | } | |
33 | ||
34 | static struct net_bridge_mdb_entry *__br_mdb_ip_get( | |
35 | struct net_bridge_mdb_htable *mdb, __be32 dst, int hash) | |
36 | { | |
37 | struct net_bridge_mdb_entry *mp; | |
38 | struct hlist_node *p; | |
39 | ||
40 | hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) { | |
41 | if (dst == mp->addr) | |
42 | return mp; | |
43 | } | |
44 | ||
45 | return NULL; | |
46 | } | |
47 | ||
48 | static struct net_bridge_mdb_entry *br_mdb_ip_get( | |
49 | struct net_bridge_mdb_htable *mdb, __be32 dst) | |
50 | { | |
51 | return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst)); | |
52 | } | |
53 | ||
54 | struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, | |
55 | struct sk_buff *skb) | |
56 | { | |
57 | struct net_bridge_mdb_htable *mdb = br->mdb; | |
58 | ||
59 | if (!mdb || br->multicast_disabled) | |
60 | return NULL; | |
61 | ||
62 | switch (skb->protocol) { | |
63 | case htons(ETH_P_IP): | |
64 | if (BR_INPUT_SKB_CB(skb)->igmp) | |
65 | break; | |
66 | return br_mdb_ip_get(mdb, ip_hdr(skb)->daddr); | |
67 | } | |
68 | ||
69 | return NULL; | |
70 | } | |
71 | ||
72 | static void br_mdb_free(struct rcu_head *head) | |
73 | { | |
74 | struct net_bridge_mdb_htable *mdb = | |
75 | container_of(head, struct net_bridge_mdb_htable, rcu); | |
76 | struct net_bridge_mdb_htable *old = mdb->old; | |
77 | ||
78 | mdb->old = NULL; | |
79 | kfree(old->mhash); | |
80 | kfree(old); | |
81 | } | |
82 | ||
83 | static int br_mdb_copy(struct net_bridge_mdb_htable *new, | |
84 | struct net_bridge_mdb_htable *old, | |
85 | int elasticity) | |
86 | { | |
87 | struct net_bridge_mdb_entry *mp; | |
88 | struct hlist_node *p; | |
89 | int maxlen; | |
90 | int len; | |
91 | int i; | |
92 | ||
93 | for (i = 0; i < old->max; i++) | |
94 | hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver]) | |
95 | hlist_add_head(&mp->hlist[new->ver], | |
96 | &new->mhash[br_ip_hash(new, mp->addr)]); | |
97 | ||
98 | if (!elasticity) | |
99 | return 0; | |
100 | ||
101 | maxlen = 0; | |
102 | for (i = 0; i < new->max; i++) { | |
103 | len = 0; | |
104 | hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver]) | |
105 | len++; | |
106 | if (len > maxlen) | |
107 | maxlen = len; | |
108 | } | |
109 | ||
110 | return maxlen > elasticity ? -EINVAL : 0; | |
111 | } | |
112 | ||
113 | static void br_multicast_free_pg(struct rcu_head *head) | |
114 | { | |
115 | struct net_bridge_port_group *p = | |
116 | container_of(head, struct net_bridge_port_group, rcu); | |
117 | ||
118 | kfree(p); | |
119 | } | |
120 | ||
121 | static void br_multicast_free_group(struct rcu_head *head) | |
122 | { | |
123 | struct net_bridge_mdb_entry *mp = | |
124 | container_of(head, struct net_bridge_mdb_entry, rcu); | |
125 | ||
126 | kfree(mp); | |
127 | } | |
128 | ||
129 | static void br_multicast_group_expired(unsigned long data) | |
130 | { | |
131 | struct net_bridge_mdb_entry *mp = (void *)data; | |
132 | struct net_bridge *br = mp->br; | |
133 | struct net_bridge_mdb_htable *mdb; | |
134 | ||
135 | spin_lock(&br->multicast_lock); | |
136 | if (!netif_running(br->dev) || timer_pending(&mp->timer)) | |
137 | goto out; | |
138 | ||
139 | if (!hlist_unhashed(&mp->mglist)) | |
140 | hlist_del_init(&mp->mglist); | |
141 | ||
142 | if (mp->ports) | |
143 | goto out; | |
144 | ||
145 | mdb = br->mdb; | |
146 | hlist_del_rcu(&mp->hlist[mdb->ver]); | |
147 | mdb->size--; | |
148 | ||
149 | del_timer(&mp->query_timer); | |
150 | call_rcu_bh(&mp->rcu, br_multicast_free_group); | |
151 | ||
152 | out: | |
153 | spin_unlock(&br->multicast_lock); | |
154 | } | |
155 | ||
156 | static void br_multicast_del_pg(struct net_bridge *br, | |
157 | struct net_bridge_port_group *pg) | |
158 | { | |
159 | struct net_bridge_mdb_htable *mdb = br->mdb; | |
160 | struct net_bridge_mdb_entry *mp; | |
161 | struct net_bridge_port_group *p; | |
162 | struct net_bridge_port_group **pp; | |
163 | ||
164 | mp = br_mdb_ip_get(mdb, pg->addr); | |
165 | if (WARN_ON(!mp)) | |
166 | return; | |
167 | ||
168 | for (pp = &mp->ports; (p = *pp); pp = &p->next) { | |
169 | if (p != pg) | |
170 | continue; | |
171 | ||
172 | *pp = p->next; | |
173 | hlist_del_init(&p->mglist); | |
174 | del_timer(&p->timer); | |
175 | del_timer(&p->query_timer); | |
176 | call_rcu_bh(&p->rcu, br_multicast_free_pg); | |
177 | ||
178 | if (!mp->ports && hlist_unhashed(&mp->mglist) && | |
179 | netif_running(br->dev)) | |
180 | mod_timer(&mp->timer, jiffies); | |
181 | ||
182 | return; | |
183 | } | |
184 | ||
185 | WARN_ON(1); | |
186 | } | |
187 | ||
188 | static void br_multicast_port_group_expired(unsigned long data) | |
189 | { | |
190 | struct net_bridge_port_group *pg = (void *)data; | |
191 | struct net_bridge *br = pg->port->br; | |
192 | ||
193 | spin_lock(&br->multicast_lock); | |
194 | if (!netif_running(br->dev) || timer_pending(&pg->timer) || | |
195 | hlist_unhashed(&pg->mglist)) | |
196 | goto out; | |
197 | ||
198 | br_multicast_del_pg(br, pg); | |
199 | ||
200 | out: | |
201 | spin_unlock(&br->multicast_lock); | |
202 | } | |
203 | ||
204 | static int br_mdb_rehash(struct net_bridge_mdb_htable **mdbp, int max, | |
205 | int elasticity) | |
206 | { | |
207 | struct net_bridge_mdb_htable *old = *mdbp; | |
208 | struct net_bridge_mdb_htable *mdb; | |
209 | int err; | |
210 | ||
211 | mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC); | |
212 | if (!mdb) | |
213 | return -ENOMEM; | |
214 | ||
215 | mdb->max = max; | |
216 | mdb->old = old; | |
217 | ||
218 | mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC); | |
219 | if (!mdb->mhash) { | |
220 | kfree(mdb); | |
221 | return -ENOMEM; | |
222 | } | |
223 | ||
224 | mdb->size = old ? old->size : 0; | |
225 | mdb->ver = old ? old->ver ^ 1 : 0; | |
226 | ||
227 | if (!old || elasticity) | |
228 | get_random_bytes(&mdb->secret, sizeof(mdb->secret)); | |
229 | else | |
230 | mdb->secret = old->secret; | |
231 | ||
232 | if (!old) | |
233 | goto out; | |
234 | ||
235 | err = br_mdb_copy(mdb, old, elasticity); | |
236 | if (err) { | |
237 | kfree(mdb->mhash); | |
238 | kfree(mdb); | |
239 | return err; | |
240 | } | |
241 | ||
242 | call_rcu_bh(&mdb->rcu, br_mdb_free); | |
243 | ||
244 | out: | |
245 | rcu_assign_pointer(*mdbp, mdb); | |
246 | ||
247 | return 0; | |
248 | } | |
249 | ||
250 | static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, | |
251 | __be32 group) | |
252 | { | |
253 | struct sk_buff *skb; | |
254 | struct igmphdr *ih; | |
255 | struct ethhdr *eth; | |
256 | struct iphdr *iph; | |
257 | ||
258 | skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) + | |
259 | sizeof(*ih) + 4); | |
260 | if (!skb) | |
261 | goto out; | |
262 | ||
263 | skb->protocol = htons(ETH_P_IP); | |
264 | ||
265 | skb_reset_mac_header(skb); | |
266 | eth = eth_hdr(skb); | |
267 | ||
268 | memcpy(eth->h_source, br->dev->dev_addr, 6); | |
269 | eth->h_dest[0] = 1; | |
270 | eth->h_dest[1] = 0; | |
271 | eth->h_dest[2] = 0x5e; | |
272 | eth->h_dest[3] = 0; | |
273 | eth->h_dest[4] = 0; | |
274 | eth->h_dest[5] = 1; | |
275 | eth->h_proto = htons(ETH_P_IP); | |
276 | skb_put(skb, sizeof(*eth)); | |
277 | ||
278 | skb_set_network_header(skb, skb->len); | |
279 | iph = ip_hdr(skb); | |
280 | ||
281 | iph->version = 4; | |
282 | iph->ihl = 6; | |
283 | iph->tos = 0xc0; | |
284 | iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4); | |
285 | iph->id = 0; | |
286 | iph->frag_off = htons(IP_DF); | |
287 | iph->ttl = 1; | |
288 | iph->protocol = IPPROTO_IGMP; | |
289 | iph->saddr = 0; | |
290 | iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); | |
291 | ((u8 *)&iph[1])[0] = IPOPT_RA; | |
292 | ((u8 *)&iph[1])[1] = 4; | |
293 | ((u8 *)&iph[1])[2] = 0; | |
294 | ((u8 *)&iph[1])[3] = 0; | |
295 | ip_send_check(iph); | |
296 | skb_put(skb, 24); | |
297 | ||
298 | skb_set_transport_header(skb, skb->len); | |
299 | ih = igmp_hdr(skb); | |
300 | ih->type = IGMP_HOST_MEMBERSHIP_QUERY; | |
301 | ih->code = (group ? br->multicast_last_member_interval : | |
302 | br->multicast_query_response_interval) / | |
303 | (HZ / IGMP_TIMER_SCALE); | |
304 | ih->group = group; | |
305 | ih->csum = 0; | |
306 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
307 | skb_put(skb, sizeof(*ih)); | |
308 | ||
309 | __skb_pull(skb, sizeof(*eth)); | |
310 | ||
311 | out: | |
312 | return skb; | |
313 | } | |
314 | ||
315 | static void br_multicast_send_group_query(struct net_bridge_mdb_entry *mp) | |
316 | { | |
317 | struct net_bridge *br = mp->br; | |
318 | struct sk_buff *skb; | |
319 | ||
320 | skb = br_multicast_alloc_query(br, mp->addr); | |
321 | if (!skb) | |
322 | goto timer; | |
323 | ||
324 | netif_rx(skb); | |
325 | ||
326 | timer: | |
327 | if (++mp->queries_sent < br->multicast_last_member_count) | |
328 | mod_timer(&mp->query_timer, | |
329 | jiffies + br->multicast_last_member_interval); | |
330 | } | |
331 | ||
332 | static void br_multicast_group_query_expired(unsigned long data) | |
333 | { | |
334 | struct net_bridge_mdb_entry *mp = (void *)data; | |
335 | struct net_bridge *br = mp->br; | |
336 | ||
337 | spin_lock(&br->multicast_lock); | |
338 | if (!netif_running(br->dev) || hlist_unhashed(&mp->mglist) || | |
339 | mp->queries_sent >= br->multicast_last_member_count) | |
340 | goto out; | |
341 | ||
342 | br_multicast_send_group_query(mp); | |
343 | ||
344 | out: | |
345 | spin_unlock(&br->multicast_lock); | |
346 | } | |
347 | ||
348 | static void br_multicast_send_port_group_query(struct net_bridge_port_group *pg) | |
349 | { | |
350 | struct net_bridge_port *port = pg->port; | |
351 | struct net_bridge *br = port->br; | |
352 | struct sk_buff *skb; | |
353 | ||
354 | skb = br_multicast_alloc_query(br, pg->addr); | |
355 | if (!skb) | |
356 | goto timer; | |
357 | ||
358 | br_deliver(port, skb); | |
359 | ||
360 | timer: | |
361 | if (++pg->queries_sent < br->multicast_last_member_count) | |
362 | mod_timer(&pg->query_timer, | |
363 | jiffies + br->multicast_last_member_interval); | |
364 | } | |
365 | ||
366 | static void br_multicast_port_group_query_expired(unsigned long data) | |
367 | { | |
368 | struct net_bridge_port_group *pg = (void *)data; | |
369 | struct net_bridge_port *port = pg->port; | |
370 | struct net_bridge *br = port->br; | |
371 | ||
372 | spin_lock(&br->multicast_lock); | |
373 | if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) || | |
374 | pg->queries_sent >= br->multicast_last_member_count) | |
375 | goto out; | |
376 | ||
377 | br_multicast_send_port_group_query(pg); | |
378 | ||
379 | out: | |
380 | spin_unlock(&br->multicast_lock); | |
381 | } | |
382 | ||
383 | static struct net_bridge_mdb_entry *br_multicast_get_group( | |
384 | struct net_bridge *br, struct net_bridge_port *port, __be32 group, | |
385 | int hash) | |
386 | { | |
387 | struct net_bridge_mdb_htable *mdb = br->mdb; | |
388 | struct net_bridge_mdb_entry *mp; | |
389 | struct hlist_node *p; | |
390 | unsigned count = 0; | |
391 | unsigned max; | |
392 | int elasticity; | |
393 | int err; | |
394 | ||
395 | hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) { | |
396 | count++; | |
397 | if (unlikely(group == mp->addr)) { | |
398 | return mp; | |
399 | } | |
400 | } | |
401 | ||
402 | elasticity = 0; | |
403 | max = mdb->max; | |
404 | ||
405 | if (unlikely(count > br->hash_elasticity && count)) { | |
406 | if (net_ratelimit()) | |
407 | printk(KERN_INFO "%s: Multicast hash table " | |
408 | "chain limit reached: %s\n", | |
409 | br->dev->name, port ? port->dev->name : | |
410 | br->dev->name); | |
411 | ||
412 | elasticity = br->hash_elasticity; | |
413 | } | |
414 | ||
415 | if (mdb->size >= max) { | |
416 | max *= 2; | |
417 | if (unlikely(max >= br->hash_max)) { | |
418 | printk(KERN_WARNING "%s: Multicast hash table maximum " | |
419 | "reached, disabling snooping: %s, %d\n", | |
420 | br->dev->name, port ? port->dev->name : | |
421 | br->dev->name, | |
422 | max); | |
423 | err = -E2BIG; | |
424 | disable: | |
425 | br->multicast_disabled = 1; | |
426 | goto err; | |
427 | } | |
428 | } | |
429 | ||
430 | if (max > mdb->max || elasticity) { | |
431 | if (mdb->old) { | |
432 | if (net_ratelimit()) | |
433 | printk(KERN_INFO "%s: Multicast hash table " | |
434 | "on fire: %s\n", | |
435 | br->dev->name, port ? port->dev->name : | |
436 | br->dev->name); | |
437 | err = -EEXIST; | |
438 | goto err; | |
439 | } | |
440 | ||
441 | err = br_mdb_rehash(&br->mdb, max, elasticity); | |
442 | if (err) { | |
443 | printk(KERN_WARNING "%s: Cannot rehash multicast " | |
444 | "hash table, disabling snooping: " | |
445 | "%s, %d, %d\n", | |
446 | br->dev->name, port ? port->dev->name : | |
447 | br->dev->name, | |
448 | mdb->size, err); | |
449 | goto disable; | |
450 | } | |
451 | ||
452 | err = -EAGAIN; | |
453 | goto err; | |
454 | } | |
455 | ||
456 | return NULL; | |
457 | ||
458 | err: | |
459 | mp = ERR_PTR(err); | |
460 | return mp; | |
461 | } | |
462 | ||
463 | static struct net_bridge_mdb_entry *br_multicast_new_group( | |
464 | struct net_bridge *br, struct net_bridge_port *port, __be32 group) | |
465 | { | |
466 | struct net_bridge_mdb_htable *mdb = br->mdb; | |
467 | struct net_bridge_mdb_entry *mp; | |
468 | int hash; | |
469 | ||
470 | if (!mdb) { | |
471 | if (br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0)) | |
472 | return NULL; | |
473 | goto rehash; | |
474 | } | |
475 | ||
476 | hash = br_ip_hash(mdb, group); | |
477 | mp = br_multicast_get_group(br, port, group, hash); | |
478 | switch (PTR_ERR(mp)) { | |
479 | case 0: | |
480 | break; | |
481 | ||
482 | case -EAGAIN: | |
483 | rehash: | |
484 | mdb = br->mdb; | |
485 | hash = br_ip_hash(mdb, group); | |
486 | break; | |
487 | ||
488 | default: | |
489 | goto out; | |
490 | } | |
491 | ||
492 | mp = kzalloc(sizeof(*mp), GFP_ATOMIC); | |
493 | if (unlikely(!mp)) | |
494 | goto out; | |
495 | ||
496 | mp->br = br; | |
497 | mp->addr = group; | |
498 | setup_timer(&mp->timer, br_multicast_group_expired, | |
499 | (unsigned long)mp); | |
500 | setup_timer(&mp->query_timer, br_multicast_group_query_expired, | |
501 | (unsigned long)mp); | |
502 | ||
503 | hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]); | |
504 | mdb->size++; | |
505 | ||
506 | out: | |
507 | return mp; | |
508 | } | |
509 | ||
510 | static int br_multicast_add_group(struct net_bridge *br, | |
511 | struct net_bridge_port *port, __be32 group) | |
512 | { | |
513 | struct net_bridge_mdb_entry *mp; | |
514 | struct net_bridge_port_group *p; | |
515 | struct net_bridge_port_group **pp; | |
516 | unsigned long now = jiffies; | |
517 | int err; | |
518 | ||
519 | if (ipv4_is_local_multicast(group)) | |
520 | return 0; | |
521 | ||
522 | spin_lock(&br->multicast_lock); | |
523 | if (!netif_running(br->dev) || | |
524 | (port && port->state == BR_STATE_DISABLED)) | |
525 | goto out; | |
526 | ||
527 | mp = br_multicast_new_group(br, port, group); | |
528 | err = PTR_ERR(mp); | |
529 | if (unlikely(IS_ERR(mp) || !mp)) | |
530 | goto err; | |
531 | ||
532 | if (!port) { | |
533 | hlist_add_head(&mp->mglist, &br->mglist); | |
534 | mod_timer(&mp->timer, now + br->multicast_membership_interval); | |
535 | goto out; | |
536 | } | |
537 | ||
538 | for (pp = &mp->ports; (p = *pp); pp = &p->next) { | |
539 | if (p->port == port) | |
540 | goto found; | |
541 | if ((unsigned long)p->port < (unsigned long)port) | |
542 | break; | |
543 | } | |
544 | ||
545 | p = kzalloc(sizeof(*p), GFP_ATOMIC); | |
546 | err = -ENOMEM; | |
547 | if (unlikely(!p)) | |
548 | goto err; | |
549 | ||
550 | p->addr = group; | |
551 | p->port = port; | |
552 | p->next = *pp; | |
553 | hlist_add_head(&p->mglist, &port->mglist); | |
554 | setup_timer(&p->timer, br_multicast_port_group_expired, | |
555 | (unsigned long)p); | |
556 | setup_timer(&p->query_timer, br_multicast_port_group_query_expired, | |
557 | (unsigned long)p); | |
558 | ||
559 | rcu_assign_pointer(*pp, p); | |
560 | ||
561 | found: | |
562 | mod_timer(&p->timer, now + br->multicast_membership_interval); | |
563 | out: | |
564 | err = 0; | |
565 | ||
566 | err: | |
567 | spin_unlock(&br->multicast_lock); | |
568 | return err; | |
569 | } | |
570 | ||
571 | static void br_multicast_router_expired(unsigned long data) | |
572 | { | |
573 | struct net_bridge_port *port = (void *)data; | |
574 | struct net_bridge *br = port->br; | |
575 | ||
576 | spin_lock(&br->multicast_lock); | |
577 | if (port->multicast_router != 1 || | |
578 | timer_pending(&port->multicast_router_timer) || | |
579 | hlist_unhashed(&port->rlist)) | |
580 | goto out; | |
581 | ||
582 | hlist_del_init_rcu(&port->rlist); | |
583 | ||
584 | out: | |
585 | spin_unlock(&br->multicast_lock); | |
586 | } | |
587 | ||
588 | static void br_multicast_local_router_expired(unsigned long data) | |
589 | { | |
590 | } | |
591 | ||
592 | static void br_multicast_send_query(struct net_bridge *br, | |
593 | struct net_bridge_port *port, u32 sent) | |
594 | { | |
595 | unsigned long time; | |
596 | struct sk_buff *skb; | |
597 | ||
598 | if (!netif_running(br->dev) || br->multicast_disabled || | |
599 | timer_pending(&br->multicast_querier_timer)) | |
600 | return; | |
601 | ||
602 | skb = br_multicast_alloc_query(br, 0); | |
603 | if (!skb) | |
604 | goto timer; | |
605 | ||
606 | if (port) { | |
607 | __skb_push(skb, sizeof(struct ethhdr)); | |
608 | skb->dev = port->dev; | |
609 | NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, | |
610 | dev_queue_xmit); | |
611 | } else | |
612 | netif_rx(skb); | |
613 | ||
614 | timer: | |
615 | time = jiffies; | |
616 | time += sent < br->multicast_startup_query_count ? | |
617 | br->multicast_startup_query_interval : | |
618 | br->multicast_query_interval; | |
619 | mod_timer(port ? &port->multicast_query_timer : | |
620 | &br->multicast_query_timer, time); | |
621 | } | |
622 | ||
623 | static void br_multicast_port_query_expired(unsigned long data) | |
624 | { | |
625 | struct net_bridge_port *port = (void *)data; | |
626 | struct net_bridge *br = port->br; | |
627 | ||
628 | spin_lock(&br->multicast_lock); | |
629 | if (port && (port->state == BR_STATE_DISABLED || | |
630 | port->state == BR_STATE_BLOCKING)) | |
631 | goto out; | |
632 | ||
633 | if (port->multicast_startup_queries_sent < | |
634 | br->multicast_startup_query_count) | |
635 | port->multicast_startup_queries_sent++; | |
636 | ||
637 | br_multicast_send_query(port->br, port, | |
638 | port->multicast_startup_queries_sent); | |
639 | ||
640 | out: | |
641 | spin_unlock(&br->multicast_lock); | |
642 | } | |
643 | ||
644 | void br_multicast_add_port(struct net_bridge_port *port) | |
645 | { | |
646 | port->multicast_router = 1; | |
647 | ||
648 | setup_timer(&port->multicast_router_timer, br_multicast_router_expired, | |
649 | (unsigned long)port); | |
650 | setup_timer(&port->multicast_query_timer, | |
651 | br_multicast_port_query_expired, (unsigned long)port); | |
652 | } | |
653 | ||
654 | void br_multicast_del_port(struct net_bridge_port *port) | |
655 | { | |
656 | del_timer_sync(&port->multicast_router_timer); | |
657 | } | |
658 | ||
659 | void br_multicast_enable_port(struct net_bridge_port *port) | |
660 | { | |
661 | struct net_bridge *br = port->br; | |
662 | ||
663 | spin_lock(&br->multicast_lock); | |
664 | if (br->multicast_disabled || !netif_running(br->dev)) | |
665 | goto out; | |
666 | ||
667 | port->multicast_startup_queries_sent = 0; | |
668 | ||
669 | if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 || | |
670 | del_timer(&port->multicast_query_timer)) | |
671 | mod_timer(&port->multicast_query_timer, jiffies); | |
672 | ||
673 | out: | |
674 | spin_unlock(&br->multicast_lock); | |
675 | } | |
676 | ||
677 | void br_multicast_disable_port(struct net_bridge_port *port) | |
678 | { | |
679 | struct net_bridge *br = port->br; | |
680 | struct net_bridge_port_group *pg; | |
681 | struct hlist_node *p, *n; | |
682 | ||
683 | spin_lock(&br->multicast_lock); | |
684 | hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist) | |
685 | br_multicast_del_pg(br, pg); | |
686 | ||
687 | if (!hlist_unhashed(&port->rlist)) | |
688 | hlist_del_init_rcu(&port->rlist); | |
689 | del_timer(&port->multicast_router_timer); | |
690 | del_timer(&port->multicast_query_timer); | |
691 | spin_unlock(&br->multicast_lock); | |
692 | } | |
693 | ||
694 | static int br_multicast_igmp3_report(struct net_bridge *br, | |
695 | struct net_bridge_port *port, | |
696 | struct sk_buff *skb) | |
697 | { | |
698 | struct igmpv3_report *ih; | |
699 | struct igmpv3_grec *grec; | |
700 | int i; | |
701 | int len; | |
702 | int num; | |
703 | int type; | |
704 | int err = 0; | |
705 | __be32 group; | |
706 | ||
707 | if (!pskb_may_pull(skb, sizeof(*ih))) | |
708 | return -EINVAL; | |
709 | ||
710 | ih = igmpv3_report_hdr(skb); | |
711 | num = ntohs(ih->ngrec); | |
712 | len = sizeof(*ih); | |
713 | ||
714 | for (i = 0; i < num; i++) { | |
715 | len += sizeof(*grec); | |
716 | if (!pskb_may_pull(skb, len)) | |
717 | return -EINVAL; | |
718 | ||
719 | grec = (void *)(skb->data + len); | |
720 | group = grec->grec_mca; | |
721 | type = grec->grec_type; | |
722 | ||
723 | len += grec->grec_nsrcs * 4; | |
724 | if (!pskb_may_pull(skb, len)) | |
725 | return -EINVAL; | |
726 | ||
727 | /* We treat this as an IGMPv2 report for now. */ | |
728 | switch (type) { | |
729 | case IGMPV3_MODE_IS_INCLUDE: | |
730 | case IGMPV3_MODE_IS_EXCLUDE: | |
731 | case IGMPV3_CHANGE_TO_INCLUDE: | |
732 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
733 | case IGMPV3_ALLOW_NEW_SOURCES: | |
734 | case IGMPV3_BLOCK_OLD_SOURCES: | |
735 | break; | |
736 | ||
737 | default: | |
738 | continue; | |
739 | } | |
740 | ||
741 | err = br_multicast_add_group(br, port, group); | |
742 | if (err) | |
743 | break; | |
744 | } | |
745 | ||
746 | return err; | |
747 | } | |
748 | ||
749 | static void br_multicast_mark_router(struct net_bridge *br, | |
750 | struct net_bridge_port *port) | |
751 | { | |
752 | unsigned long now = jiffies; | |
753 | struct hlist_node *p; | |
754 | struct hlist_node **h; | |
755 | ||
756 | if (!port) { | |
757 | if (br->multicast_router == 1) | |
758 | mod_timer(&br->multicast_router_timer, | |
759 | now + br->multicast_querier_interval); | |
760 | return; | |
761 | } | |
762 | ||
763 | if (port->multicast_router != 1) | |
764 | return; | |
765 | ||
766 | if (!hlist_unhashed(&port->rlist)) | |
767 | goto timer; | |
768 | ||
769 | for (h = &br->router_list.first; | |
770 | (p = *h) && | |
771 | (unsigned long)container_of(p, struct net_bridge_port, rlist) > | |
772 | (unsigned long)port; | |
773 | h = &p->next) | |
774 | ; | |
775 | ||
776 | port->rlist.pprev = h; | |
777 | port->rlist.next = p; | |
778 | rcu_assign_pointer(*h, &port->rlist); | |
779 | if (p) | |
780 | p->pprev = &port->rlist.next; | |
781 | ||
782 | timer: | |
783 | mod_timer(&port->multicast_router_timer, | |
784 | now + br->multicast_querier_interval); | |
785 | } | |
786 | ||
787 | static void br_multicast_query_received(struct net_bridge *br, | |
788 | struct net_bridge_port *port, | |
789 | __be32 saddr) | |
790 | { | |
791 | if (saddr) | |
792 | mod_timer(&br->multicast_querier_timer, | |
793 | jiffies + br->multicast_querier_interval); | |
794 | else if (timer_pending(&br->multicast_querier_timer)) | |
795 | return; | |
796 | ||
797 | br_multicast_mark_router(br, port); | |
798 | } | |
799 | ||
800 | static int br_multicast_query(struct net_bridge *br, | |
801 | struct net_bridge_port *port, | |
802 | struct sk_buff *skb) | |
803 | { | |
804 | struct iphdr *iph = ip_hdr(skb); | |
805 | struct igmphdr *ih = igmp_hdr(skb); | |
806 | struct net_bridge_mdb_entry *mp; | |
807 | struct igmpv3_query *ih3; | |
808 | struct net_bridge_port_group *p; | |
809 | struct net_bridge_port_group **pp; | |
810 | unsigned long max_delay; | |
811 | unsigned long now = jiffies; | |
812 | __be32 group; | |
813 | ||
814 | spin_lock(&br->multicast_lock); | |
815 | if (!netif_running(br->dev) || | |
816 | (port && port->state == BR_STATE_DISABLED)) | |
817 | goto out; | |
818 | ||
819 | br_multicast_query_received(br, port, iph->saddr); | |
820 | ||
821 | group = ih->group; | |
822 | ||
823 | if (skb->len == sizeof(*ih)) { | |
824 | max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); | |
825 | ||
826 | if (!max_delay) { | |
827 | max_delay = 10 * HZ; | |
828 | group = 0; | |
829 | } | |
830 | } else { | |
831 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
832 | return -EINVAL; | |
833 | ||
834 | ih3 = igmpv3_query_hdr(skb); | |
835 | if (ih3->nsrcs) | |
836 | return 0; | |
837 | ||
838 | max_delay = ih3->code ? 1 : | |
839 | IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE); | |
840 | } | |
841 | ||
842 | if (!group) | |
843 | goto out; | |
844 | ||
845 | mp = br_mdb_ip_get(br->mdb, group); | |
846 | if (!mp) | |
847 | goto out; | |
848 | ||
849 | max_delay *= br->multicast_last_member_count; | |
850 | ||
851 | if (!hlist_unhashed(&mp->mglist) && | |
852 | (timer_pending(&mp->timer) ? | |
853 | time_after(mp->timer.expires, now + max_delay) : | |
854 | try_to_del_timer_sync(&mp->timer) >= 0)) | |
855 | mod_timer(&mp->timer, now + max_delay); | |
856 | ||
857 | for (pp = &mp->ports; (p = *pp); pp = &p->next) { | |
858 | if (timer_pending(&p->timer) ? | |
859 | time_after(p->timer.expires, now + max_delay) : | |
860 | try_to_del_timer_sync(&p->timer) >= 0) | |
861 | mod_timer(&mp->timer, now + max_delay); | |
862 | } | |
863 | ||
864 | out: | |
865 | spin_unlock(&br->multicast_lock); | |
866 | return 0; | |
867 | } | |
868 | ||
869 | static void br_multicast_leave_group(struct net_bridge *br, | |
870 | struct net_bridge_port *port, | |
871 | __be32 group) | |
872 | { | |
873 | struct net_bridge_mdb_htable *mdb; | |
874 | struct net_bridge_mdb_entry *mp; | |
875 | struct net_bridge_port_group *p; | |
876 | unsigned long now; | |
877 | unsigned long time; | |
878 | ||
879 | if (ipv4_is_local_multicast(group)) | |
880 | return; | |
881 | ||
882 | spin_lock(&br->multicast_lock); | |
883 | if (!netif_running(br->dev) || | |
884 | (port && port->state == BR_STATE_DISABLED) || | |
885 | timer_pending(&br->multicast_querier_timer)) | |
886 | goto out; | |
887 | ||
888 | mdb = br->mdb; | |
889 | mp = br_mdb_ip_get(mdb, group); | |
890 | if (!mp) | |
891 | goto out; | |
892 | ||
893 | now = jiffies; | |
894 | time = now + br->multicast_last_member_count * | |
895 | br->multicast_last_member_interval; | |
896 | ||
897 | if (!port) { | |
898 | if (!hlist_unhashed(&mp->mglist) && | |
899 | (timer_pending(&mp->timer) ? | |
900 | time_after(mp->timer.expires, time) : | |
901 | try_to_del_timer_sync(&mp->timer) >= 0)) { | |
902 | mod_timer(&mp->timer, time); | |
903 | ||
904 | mp->queries_sent = 0; | |
905 | mod_timer(&mp->query_timer, now); | |
906 | } | |
907 | ||
908 | goto out; | |
909 | } | |
910 | ||
911 | for (p = mp->ports; p; p = p->next) { | |
912 | if (p->port != port) | |
913 | continue; | |
914 | ||
915 | if (!hlist_unhashed(&p->mglist) && | |
916 | (timer_pending(&p->timer) ? | |
917 | time_after(p->timer.expires, time) : | |
918 | try_to_del_timer_sync(&p->timer) >= 0)) { | |
919 | mod_timer(&p->timer, time); | |
920 | ||
921 | p->queries_sent = 0; | |
922 | mod_timer(&p->query_timer, now); | |
923 | } | |
924 | ||
925 | break; | |
926 | } | |
927 | ||
928 | out: | |
929 | spin_unlock(&br->multicast_lock); | |
930 | } | |
931 | ||
932 | static int br_multicast_ipv4_rcv(struct net_bridge *br, | |
933 | struct net_bridge_port *port, | |
934 | struct sk_buff *skb) | |
935 | { | |
936 | struct sk_buff *skb2 = skb; | |
937 | struct iphdr *iph; | |
938 | struct igmphdr *ih; | |
939 | unsigned len; | |
940 | unsigned offset; | |
941 | int err; | |
942 | ||
943 | BR_INPUT_SKB_CB(skb)->igmp = 0; | |
944 | BR_INPUT_SKB_CB(skb)->mrouters_only = 0; | |
945 | ||
946 | /* We treat OOM as packet loss for now. */ | |
947 | if (!pskb_may_pull(skb, sizeof(*iph))) | |
948 | return -EINVAL; | |
949 | ||
950 | iph = ip_hdr(skb); | |
951 | ||
952 | if (iph->ihl < 5 || iph->version != 4) | |
953 | return -EINVAL; | |
954 | ||
955 | if (!pskb_may_pull(skb, ip_hdrlen(skb))) | |
956 | return -EINVAL; | |
957 | ||
958 | iph = ip_hdr(skb); | |
959 | ||
960 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
961 | return -EINVAL; | |
962 | ||
963 | if (iph->protocol != IPPROTO_IGMP) | |
964 | return 0; | |
965 | ||
966 | len = ntohs(iph->tot_len); | |
967 | if (skb->len < len || len < ip_hdrlen(skb)) | |
968 | return -EINVAL; | |
969 | ||
970 | if (skb->len > len) { | |
971 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
972 | if (!skb2) | |
973 | return -ENOMEM; | |
974 | ||
975 | err = pskb_trim_rcsum(skb2, len); | |
976 | if (err) | |
977 | return err; | |
978 | } | |
979 | ||
980 | len -= ip_hdrlen(skb2); | |
981 | offset = skb_network_offset(skb2) + ip_hdrlen(skb2); | |
982 | __skb_pull(skb2, offset); | |
983 | skb_reset_transport_header(skb2); | |
984 | ||
985 | err = -EINVAL; | |
986 | if (!pskb_may_pull(skb2, sizeof(*ih))) | |
987 | goto out; | |
988 | ||
989 | iph = ip_hdr(skb2); | |
990 | ||
991 | switch (skb2->ip_summed) { | |
992 | case CHECKSUM_COMPLETE: | |
993 | if (!csum_fold(skb2->csum)) | |
994 | break; | |
995 | /* fall through */ | |
996 | case CHECKSUM_NONE: | |
997 | skb2->csum = 0; | |
998 | if (skb_checksum_complete(skb2)) | |
999 | return -EINVAL; | |
1000 | } | |
1001 | ||
1002 | err = 0; | |
1003 | ||
1004 | BR_INPUT_SKB_CB(skb)->igmp = 1; | |
1005 | ih = igmp_hdr(skb2); | |
1006 | ||
1007 | switch (ih->type) { | |
1008 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1009 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1010 | BR_INPUT_SKB_CB(skb2)->mrouters_only = 1; | |
1011 | err = br_multicast_add_group(br, port, ih->group); | |
1012 | break; | |
1013 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
1014 | err = br_multicast_igmp3_report(br, port, skb2); | |
1015 | break; | |
1016 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
1017 | err = br_multicast_query(br, port, skb2); | |
1018 | break; | |
1019 | case IGMP_HOST_LEAVE_MESSAGE: | |
1020 | br_multicast_leave_group(br, port, ih->group); | |
1021 | break; | |
1022 | } | |
1023 | ||
1024 | out: | |
1025 | __skb_push(skb2, offset); | |
1026 | if (skb2 != skb) | |
1027 | kfree_skb(skb2); | |
1028 | return err; | |
1029 | } | |
1030 | ||
1031 | int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, | |
1032 | struct sk_buff *skb) | |
1033 | { | |
1034 | if (br->multicast_disabled) | |
1035 | return 0; | |
1036 | ||
1037 | switch (skb->protocol) { | |
1038 | case htons(ETH_P_IP): | |
1039 | return br_multicast_ipv4_rcv(br, port, skb); | |
1040 | } | |
1041 | ||
1042 | return 0; | |
1043 | } | |
1044 | ||
1045 | static void br_multicast_query_expired(unsigned long data) | |
1046 | { | |
1047 | struct net_bridge *br = (void *)data; | |
1048 | ||
1049 | spin_lock(&br->multicast_lock); | |
1050 | if (br->multicast_startup_queries_sent < | |
1051 | br->multicast_startup_query_count) | |
1052 | br->multicast_startup_queries_sent++; | |
1053 | ||
1054 | br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent); | |
1055 | ||
1056 | spin_unlock(&br->multicast_lock); | |
1057 | } | |
1058 | ||
1059 | void br_multicast_init(struct net_bridge *br) | |
1060 | { | |
1061 | br->hash_elasticity = 4; | |
1062 | br->hash_max = 512; | |
1063 | ||
1064 | br->multicast_router = 1; | |
1065 | br->multicast_last_member_count = 2; | |
1066 | br->multicast_startup_query_count = 2; | |
1067 | ||
1068 | br->multicast_last_member_interval = HZ; | |
1069 | br->multicast_query_response_interval = 10 * HZ; | |
1070 | br->multicast_startup_query_interval = 125 * HZ / 4; | |
1071 | br->multicast_query_interval = 125 * HZ; | |
1072 | br->multicast_querier_interval = 255 * HZ; | |
1073 | br->multicast_membership_interval = 260 * HZ; | |
1074 | ||
1075 | spin_lock_init(&br->multicast_lock); | |
1076 | setup_timer(&br->multicast_router_timer, | |
1077 | br_multicast_local_router_expired, 0); | |
1078 | setup_timer(&br->multicast_querier_timer, | |
1079 | br_multicast_local_router_expired, 0); | |
1080 | setup_timer(&br->multicast_query_timer, br_multicast_query_expired, | |
1081 | (unsigned long)br); | |
1082 | } | |
1083 | ||
1084 | void br_multicast_open(struct net_bridge *br) | |
1085 | { | |
1086 | br->multicast_startup_queries_sent = 0; | |
1087 | ||
1088 | if (br->multicast_disabled) | |
1089 | return; | |
1090 | ||
1091 | mod_timer(&br->multicast_query_timer, jiffies); | |
1092 | } | |
1093 | ||
1094 | void br_multicast_stop(struct net_bridge *br) | |
1095 | { | |
1096 | struct net_bridge_mdb_htable *mdb; | |
1097 | struct net_bridge_mdb_entry *mp; | |
1098 | struct hlist_node *p, *n; | |
1099 | u32 ver; | |
1100 | int i; | |
1101 | ||
1102 | del_timer_sync(&br->multicast_router_timer); | |
1103 | del_timer_sync(&br->multicast_querier_timer); | |
1104 | del_timer_sync(&br->multicast_query_timer); | |
1105 | ||
1106 | spin_lock_bh(&br->multicast_lock); | |
1107 | mdb = br->mdb; | |
1108 | if (!mdb) | |
1109 | goto out; | |
1110 | ||
1111 | br->mdb = NULL; | |
1112 | ||
1113 | ver = mdb->ver; | |
1114 | for (i = 0; i < mdb->max; i++) { | |
1115 | hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i], | |
1116 | hlist[ver]) { | |
1117 | del_timer(&mp->timer); | |
1118 | del_timer(&mp->query_timer); | |
1119 | call_rcu_bh(&mp->rcu, br_multicast_free_group); | |
1120 | } | |
1121 | } | |
1122 | ||
1123 | if (mdb->old) { | |
1124 | spin_unlock_bh(&br->multicast_lock); | |
1125 | synchronize_rcu_bh(); | |
1126 | spin_lock_bh(&br->multicast_lock); | |
1127 | WARN_ON(mdb->old); | |
1128 | } | |
1129 | ||
1130 | mdb->old = mdb; | |
1131 | call_rcu_bh(&mdb->rcu, br_mdb_free); | |
1132 | ||
1133 | out: | |
1134 | spin_unlock_bh(&br->multicast_lock); | |
1135 | } |