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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 | ||
30 | static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb, __be32 ip) | |
31 | { | |
32 | return jhash_1word(mdb->secret, (u32)ip) & (mdb->max - 1); | |
33 | } | |
34 | ||
35 | static struct net_bridge_mdb_entry *__br_mdb_ip_get( | |
36 | struct net_bridge_mdb_htable *mdb, __be32 dst, int hash) | |
37 | { | |
38 | struct net_bridge_mdb_entry *mp; | |
39 | struct hlist_node *p; | |
40 | ||
41 | hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) { | |
42 | if (dst == mp->addr) | |
43 | return mp; | |
44 | } | |
45 | ||
46 | return NULL; | |
47 | } | |
48 | ||
49 | static struct net_bridge_mdb_entry *br_mdb_ip_get( | |
50 | struct net_bridge_mdb_htable *mdb, __be32 dst) | |
51 | { | |
52 | return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst)); | |
53 | } | |
54 | ||
55 | struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, | |
56 | struct sk_buff *skb) | |
57 | { | |
58 | struct net_bridge_mdb_htable *mdb = br->mdb; | |
59 | ||
60 | if (!mdb || br->multicast_disabled) | |
61 | return NULL; | |
62 | ||
63 | switch (skb->protocol) { | |
64 | case htons(ETH_P_IP): | |
65 | if (BR_INPUT_SKB_CB(skb)->igmp) | |
66 | break; | |
67 | return br_mdb_ip_get(mdb, ip_hdr(skb)->daddr); | |
68 | } | |
69 | ||
70 | return NULL; | |
71 | } | |
72 | ||
73 | static void br_mdb_free(struct rcu_head *head) | |
74 | { | |
75 | struct net_bridge_mdb_htable *mdb = | |
76 | container_of(head, struct net_bridge_mdb_htable, rcu); | |
77 | struct net_bridge_mdb_htable *old = mdb->old; | |
78 | ||
79 | mdb->old = NULL; | |
80 | kfree(old->mhash); | |
81 | kfree(old); | |
82 | } | |
83 | ||
84 | static int br_mdb_copy(struct net_bridge_mdb_htable *new, | |
85 | struct net_bridge_mdb_htable *old, | |
86 | int elasticity) | |
87 | { | |
88 | struct net_bridge_mdb_entry *mp; | |
89 | struct hlist_node *p; | |
90 | int maxlen; | |
91 | int len; | |
92 | int i; | |
93 | ||
94 | for (i = 0; i < old->max; i++) | |
95 | hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver]) | |
96 | hlist_add_head(&mp->hlist[new->ver], | |
97 | &new->mhash[br_ip_hash(new, mp->addr)]); | |
98 | ||
99 | if (!elasticity) | |
100 | return 0; | |
101 | ||
102 | maxlen = 0; | |
103 | for (i = 0; i < new->max; i++) { | |
104 | len = 0; | |
105 | hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver]) | |
106 | len++; | |
107 | if (len > maxlen) | |
108 | maxlen = len; | |
109 | } | |
110 | ||
111 | return maxlen > elasticity ? -EINVAL : 0; | |
112 | } | |
113 | ||
114 | static void br_multicast_free_pg(struct rcu_head *head) | |
115 | { | |
116 | struct net_bridge_port_group *p = | |
117 | container_of(head, struct net_bridge_port_group, rcu); | |
118 | ||
119 | kfree(p); | |
120 | } | |
121 | ||
122 | static void br_multicast_free_group(struct rcu_head *head) | |
123 | { | |
124 | struct net_bridge_mdb_entry *mp = | |
125 | container_of(head, struct net_bridge_mdb_entry, rcu); | |
126 | ||
127 | kfree(mp); | |
128 | } | |
129 | ||
130 | static void br_multicast_group_expired(unsigned long data) | |
131 | { | |
132 | struct net_bridge_mdb_entry *mp = (void *)data; | |
133 | struct net_bridge *br = mp->br; | |
134 | struct net_bridge_mdb_htable *mdb; | |
135 | ||
136 | spin_lock(&br->multicast_lock); | |
137 | if (!netif_running(br->dev) || timer_pending(&mp->timer)) | |
138 | goto out; | |
139 | ||
140 | if (!hlist_unhashed(&mp->mglist)) | |
141 | hlist_del_init(&mp->mglist); | |
142 | ||
143 | if (mp->ports) | |
144 | goto out; | |
145 | ||
146 | mdb = br->mdb; | |
147 | hlist_del_rcu(&mp->hlist[mdb->ver]); | |
148 | mdb->size--; | |
149 | ||
150 | del_timer(&mp->query_timer); | |
151 | call_rcu_bh(&mp->rcu, br_multicast_free_group); | |
152 | ||
153 | out: | |
154 | spin_unlock(&br->multicast_lock); | |
155 | } | |
156 | ||
157 | static void br_multicast_del_pg(struct net_bridge *br, | |
158 | struct net_bridge_port_group *pg) | |
159 | { | |
160 | struct net_bridge_mdb_htable *mdb = br->mdb; | |
161 | struct net_bridge_mdb_entry *mp; | |
162 | struct net_bridge_port_group *p; | |
163 | struct net_bridge_port_group **pp; | |
164 | ||
165 | mp = br_mdb_ip_get(mdb, pg->addr); | |
166 | if (WARN_ON(!mp)) | |
167 | return; | |
168 | ||
169 | for (pp = &mp->ports; (p = *pp); pp = &p->next) { | |
170 | if (p != pg) | |
171 | continue; | |
172 | ||
173 | *pp = p->next; | |
174 | hlist_del_init(&p->mglist); | |
175 | del_timer(&p->timer); | |
176 | del_timer(&p->query_timer); | |
177 | call_rcu_bh(&p->rcu, br_multicast_free_pg); | |
178 | ||
179 | if (!mp->ports && hlist_unhashed(&mp->mglist) && | |
180 | netif_running(br->dev)) | |
181 | mod_timer(&mp->timer, jiffies); | |
182 | ||
183 | return; | |
184 | } | |
185 | ||
186 | WARN_ON(1); | |
187 | } | |
188 | ||
189 | static void br_multicast_port_group_expired(unsigned long data) | |
190 | { | |
191 | struct net_bridge_port_group *pg = (void *)data; | |
192 | struct net_bridge *br = pg->port->br; | |
193 | ||
194 | spin_lock(&br->multicast_lock); | |
195 | if (!netif_running(br->dev) || timer_pending(&pg->timer) || | |
196 | hlist_unhashed(&pg->mglist)) | |
197 | goto out; | |
198 | ||
199 | br_multicast_del_pg(br, pg); | |
200 | ||
201 | out: | |
202 | spin_unlock(&br->multicast_lock); | |
203 | } | |
204 | ||
205 | static int br_mdb_rehash(struct net_bridge_mdb_htable **mdbp, int max, | |
206 | int elasticity) | |
207 | { | |
208 | struct net_bridge_mdb_htable *old = *mdbp; | |
209 | struct net_bridge_mdb_htable *mdb; | |
210 | int err; | |
211 | ||
212 | mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC); | |
213 | if (!mdb) | |
214 | return -ENOMEM; | |
215 | ||
216 | mdb->max = max; | |
217 | mdb->old = old; | |
218 | ||
219 | mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC); | |
220 | if (!mdb->mhash) { | |
221 | kfree(mdb); | |
222 | return -ENOMEM; | |
223 | } | |
224 | ||
225 | mdb->size = old ? old->size : 0; | |
226 | mdb->ver = old ? old->ver ^ 1 : 0; | |
227 | ||
228 | if (!old || elasticity) | |
229 | get_random_bytes(&mdb->secret, sizeof(mdb->secret)); | |
230 | else | |
231 | mdb->secret = old->secret; | |
232 | ||
233 | if (!old) | |
234 | goto out; | |
235 | ||
236 | err = br_mdb_copy(mdb, old, elasticity); | |
237 | if (err) { | |
238 | kfree(mdb->mhash); | |
239 | kfree(mdb); | |
240 | return err; | |
241 | } | |
242 | ||
243 | call_rcu_bh(&mdb->rcu, br_mdb_free); | |
244 | ||
245 | out: | |
246 | rcu_assign_pointer(*mdbp, mdb); | |
247 | ||
248 | return 0; | |
249 | } | |
250 | ||
251 | static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, | |
252 | __be32 group) | |
253 | { | |
254 | struct sk_buff *skb; | |
255 | struct igmphdr *ih; | |
256 | struct ethhdr *eth; | |
257 | struct iphdr *iph; | |
258 | ||
259 | skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) + | |
260 | sizeof(*ih) + 4); | |
261 | if (!skb) | |
262 | goto out; | |
263 | ||
264 | skb->protocol = htons(ETH_P_IP); | |
265 | ||
266 | skb_reset_mac_header(skb); | |
267 | eth = eth_hdr(skb); | |
268 | ||
269 | memcpy(eth->h_source, br->dev->dev_addr, 6); | |
270 | eth->h_dest[0] = 1; | |
271 | eth->h_dest[1] = 0; | |
272 | eth->h_dest[2] = 0x5e; | |
273 | eth->h_dest[3] = 0; | |
274 | eth->h_dest[4] = 0; | |
275 | eth->h_dest[5] = 1; | |
276 | eth->h_proto = htons(ETH_P_IP); | |
277 | skb_put(skb, sizeof(*eth)); | |
278 | ||
279 | skb_set_network_header(skb, skb->len); | |
280 | iph = ip_hdr(skb); | |
281 | ||
282 | iph->version = 4; | |
283 | iph->ihl = 6; | |
284 | iph->tos = 0xc0; | |
285 | iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4); | |
286 | iph->id = 0; | |
287 | iph->frag_off = htons(IP_DF); | |
288 | iph->ttl = 1; | |
289 | iph->protocol = IPPROTO_IGMP; | |
290 | iph->saddr = 0; | |
291 | iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); | |
292 | ((u8 *)&iph[1])[0] = IPOPT_RA; | |
293 | ((u8 *)&iph[1])[1] = 4; | |
294 | ((u8 *)&iph[1])[2] = 0; | |
295 | ((u8 *)&iph[1])[3] = 0; | |
296 | ip_send_check(iph); | |
297 | skb_put(skb, 24); | |
298 | ||
299 | skb_set_transport_header(skb, skb->len); | |
300 | ih = igmp_hdr(skb); | |
301 | ih->type = IGMP_HOST_MEMBERSHIP_QUERY; | |
302 | ih->code = (group ? br->multicast_last_member_interval : | |
303 | br->multicast_query_response_interval) / | |
304 | (HZ / IGMP_TIMER_SCALE); | |
305 | ih->group = group; | |
306 | ih->csum = 0; | |
307 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
308 | skb_put(skb, sizeof(*ih)); | |
309 | ||
310 | __skb_pull(skb, sizeof(*eth)); | |
311 | ||
312 | out: | |
313 | return skb; | |
314 | } | |
315 | ||
316 | static void br_multicast_send_group_query(struct net_bridge_mdb_entry *mp) | |
317 | { | |
318 | struct net_bridge *br = mp->br; | |
319 | struct sk_buff *skb; | |
320 | ||
321 | skb = br_multicast_alloc_query(br, mp->addr); | |
322 | if (!skb) | |
323 | goto timer; | |
324 | ||
325 | netif_rx(skb); | |
326 | ||
327 | timer: | |
328 | if (++mp->queries_sent < br->multicast_last_member_count) | |
329 | mod_timer(&mp->query_timer, | |
330 | jiffies + br->multicast_last_member_interval); | |
331 | } | |
332 | ||
333 | static void br_multicast_group_query_expired(unsigned long data) | |
334 | { | |
335 | struct net_bridge_mdb_entry *mp = (void *)data; | |
336 | struct net_bridge *br = mp->br; | |
337 | ||
338 | spin_lock(&br->multicast_lock); | |
339 | if (!netif_running(br->dev) || hlist_unhashed(&mp->mglist) || | |
340 | mp->queries_sent >= br->multicast_last_member_count) | |
341 | goto out; | |
342 | ||
343 | br_multicast_send_group_query(mp); | |
344 | ||
345 | out: | |
346 | spin_unlock(&br->multicast_lock); | |
347 | } | |
348 | ||
349 | static void br_multicast_send_port_group_query(struct net_bridge_port_group *pg) | |
350 | { | |
351 | struct net_bridge_port *port = pg->port; | |
352 | struct net_bridge *br = port->br; | |
353 | struct sk_buff *skb; | |
354 | ||
355 | skb = br_multicast_alloc_query(br, pg->addr); | |
356 | if (!skb) | |
357 | goto timer; | |
358 | ||
359 | br_deliver(port, skb); | |
360 | ||
361 | timer: | |
362 | if (++pg->queries_sent < br->multicast_last_member_count) | |
363 | mod_timer(&pg->query_timer, | |
364 | jiffies + br->multicast_last_member_interval); | |
365 | } | |
366 | ||
367 | static void br_multicast_port_group_query_expired(unsigned long data) | |
368 | { | |
369 | struct net_bridge_port_group *pg = (void *)data; | |
370 | struct net_bridge_port *port = pg->port; | |
371 | struct net_bridge *br = port->br; | |
372 | ||
373 | spin_lock(&br->multicast_lock); | |
374 | if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) || | |
375 | pg->queries_sent >= br->multicast_last_member_count) | |
376 | goto out; | |
377 | ||
378 | br_multicast_send_port_group_query(pg); | |
379 | ||
380 | out: | |
381 | spin_unlock(&br->multicast_lock); | |
382 | } | |
383 | ||
384 | static struct net_bridge_mdb_entry *br_multicast_get_group( | |
385 | struct net_bridge *br, struct net_bridge_port *port, __be32 group, | |
386 | int hash) | |
387 | { | |
388 | struct net_bridge_mdb_htable *mdb = br->mdb; | |
389 | struct net_bridge_mdb_entry *mp; | |
390 | struct hlist_node *p; | |
391 | unsigned count = 0; | |
392 | unsigned max; | |
393 | int elasticity; | |
394 | int err; | |
395 | ||
396 | hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) { | |
397 | count++; | |
398 | if (unlikely(group == mp->addr)) { | |
399 | return mp; | |
400 | } | |
401 | } | |
402 | ||
403 | elasticity = 0; | |
404 | max = mdb->max; | |
405 | ||
406 | if (unlikely(count > br->hash_elasticity && count)) { | |
407 | if (net_ratelimit()) | |
408 | printk(KERN_INFO "%s: Multicast hash table " | |
409 | "chain limit reached: %s\n", | |
410 | br->dev->name, port ? port->dev->name : | |
411 | br->dev->name); | |
412 | ||
413 | elasticity = br->hash_elasticity; | |
414 | } | |
415 | ||
416 | if (mdb->size >= max) { | |
417 | max *= 2; | |
418 | if (unlikely(max >= br->hash_max)) { | |
419 | printk(KERN_WARNING "%s: Multicast hash table maximum " | |
420 | "reached, disabling snooping: %s, %d\n", | |
421 | br->dev->name, port ? port->dev->name : | |
422 | br->dev->name, | |
423 | max); | |
424 | err = -E2BIG; | |
425 | disable: | |
426 | br->multicast_disabled = 1; | |
427 | goto err; | |
428 | } | |
429 | } | |
430 | ||
431 | if (max > mdb->max || elasticity) { | |
432 | if (mdb->old) { | |
433 | if (net_ratelimit()) | |
434 | printk(KERN_INFO "%s: Multicast hash table " | |
435 | "on fire: %s\n", | |
436 | br->dev->name, port ? port->dev->name : | |
437 | br->dev->name); | |
438 | err = -EEXIST; | |
439 | goto err; | |
440 | } | |
441 | ||
442 | err = br_mdb_rehash(&br->mdb, max, elasticity); | |
443 | if (err) { | |
444 | printk(KERN_WARNING "%s: Cannot rehash multicast " | |
445 | "hash table, disabling snooping: " | |
446 | "%s, %d, %d\n", | |
447 | br->dev->name, port ? port->dev->name : | |
448 | br->dev->name, | |
449 | mdb->size, err); | |
450 | goto disable; | |
451 | } | |
452 | ||
453 | err = -EAGAIN; | |
454 | goto err; | |
455 | } | |
456 | ||
457 | return NULL; | |
458 | ||
459 | err: | |
460 | mp = ERR_PTR(err); | |
461 | return mp; | |
462 | } | |
463 | ||
464 | static struct net_bridge_mdb_entry *br_multicast_new_group( | |
465 | struct net_bridge *br, struct net_bridge_port *port, __be32 group) | |
466 | { | |
467 | struct net_bridge_mdb_htable *mdb = br->mdb; | |
468 | struct net_bridge_mdb_entry *mp; | |
469 | int hash; | |
470 | ||
471 | if (!mdb) { | |
472 | if (br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0)) | |
473 | return NULL; | |
474 | goto rehash; | |
475 | } | |
476 | ||
477 | hash = br_ip_hash(mdb, group); | |
478 | mp = br_multicast_get_group(br, port, group, hash); | |
479 | switch (PTR_ERR(mp)) { | |
480 | case 0: | |
481 | break; | |
482 | ||
483 | case -EAGAIN: | |
484 | rehash: | |
485 | mdb = br->mdb; | |
486 | hash = br_ip_hash(mdb, group); | |
487 | break; | |
488 | ||
489 | default: | |
490 | goto out; | |
491 | } | |
492 | ||
493 | mp = kzalloc(sizeof(*mp), GFP_ATOMIC); | |
494 | if (unlikely(!mp)) | |
495 | goto out; | |
496 | ||
497 | mp->br = br; | |
498 | mp->addr = group; | |
499 | setup_timer(&mp->timer, br_multicast_group_expired, | |
500 | (unsigned long)mp); | |
501 | setup_timer(&mp->query_timer, br_multicast_group_query_expired, | |
502 | (unsigned long)mp); | |
503 | ||
504 | hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]); | |
505 | mdb->size++; | |
506 | ||
507 | out: | |
508 | return mp; | |
509 | } | |
510 | ||
511 | static int br_multicast_add_group(struct net_bridge *br, | |
512 | struct net_bridge_port *port, __be32 group) | |
513 | { | |
514 | struct net_bridge_mdb_entry *mp; | |
515 | struct net_bridge_port_group *p; | |
516 | struct net_bridge_port_group **pp; | |
517 | unsigned long now = jiffies; | |
518 | int err; | |
519 | ||
520 | if (ipv4_is_local_multicast(group)) | |
521 | return 0; | |
522 | ||
523 | spin_lock(&br->multicast_lock); | |
524 | if (!netif_running(br->dev) || | |
525 | (port && port->state == BR_STATE_DISABLED)) | |
526 | goto out; | |
527 | ||
528 | mp = br_multicast_new_group(br, port, group); | |
529 | err = PTR_ERR(mp); | |
530 | if (unlikely(IS_ERR(mp) || !mp)) | |
531 | goto err; | |
532 | ||
533 | if (!port) { | |
534 | hlist_add_head(&mp->mglist, &br->mglist); | |
535 | mod_timer(&mp->timer, now + br->multicast_membership_interval); | |
536 | goto out; | |
537 | } | |
538 | ||
539 | for (pp = &mp->ports; (p = *pp); pp = &p->next) { | |
540 | if (p->port == port) | |
541 | goto found; | |
542 | if ((unsigned long)p->port < (unsigned long)port) | |
543 | break; | |
544 | } | |
545 | ||
546 | p = kzalloc(sizeof(*p), GFP_ATOMIC); | |
547 | err = -ENOMEM; | |
548 | if (unlikely(!p)) | |
549 | goto err; | |
550 | ||
551 | p->addr = group; | |
552 | p->port = port; | |
553 | p->next = *pp; | |
554 | hlist_add_head(&p->mglist, &port->mglist); | |
555 | setup_timer(&p->timer, br_multicast_port_group_expired, | |
556 | (unsigned long)p); | |
557 | setup_timer(&p->query_timer, br_multicast_port_group_query_expired, | |
558 | (unsigned long)p); | |
559 | ||
560 | rcu_assign_pointer(*pp, p); | |
561 | ||
562 | found: | |
563 | mod_timer(&p->timer, now + br->multicast_membership_interval); | |
564 | out: | |
565 | err = 0; | |
566 | ||
567 | err: | |
568 | spin_unlock(&br->multicast_lock); | |
569 | return err; | |
570 | } | |
571 | ||
572 | static void br_multicast_router_expired(unsigned long data) | |
573 | { | |
574 | struct net_bridge_port *port = (void *)data; | |
575 | struct net_bridge *br = port->br; | |
576 | ||
577 | spin_lock(&br->multicast_lock); | |
578 | if (port->multicast_router != 1 || | |
579 | timer_pending(&port->multicast_router_timer) || | |
580 | hlist_unhashed(&port->rlist)) | |
581 | goto out; | |
582 | ||
583 | hlist_del_init_rcu(&port->rlist); | |
584 | ||
585 | out: | |
586 | spin_unlock(&br->multicast_lock); | |
587 | } | |
588 | ||
589 | static void br_multicast_local_router_expired(unsigned long data) | |
590 | { | |
591 | } | |
592 | ||
593 | static void br_multicast_send_query(struct net_bridge *br, | |
594 | struct net_bridge_port *port, u32 sent) | |
595 | { | |
596 | unsigned long time; | |
597 | struct sk_buff *skb; | |
598 | ||
599 | if (!netif_running(br->dev) || br->multicast_disabled || | |
600 | timer_pending(&br->multicast_querier_timer)) | |
601 | return; | |
602 | ||
603 | skb = br_multicast_alloc_query(br, 0); | |
604 | if (!skb) | |
605 | goto timer; | |
606 | ||
607 | if (port) { | |
608 | __skb_push(skb, sizeof(struct ethhdr)); | |
609 | skb->dev = port->dev; | |
610 | NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, | |
611 | dev_queue_xmit); | |
612 | } else | |
613 | netif_rx(skb); | |
614 | ||
615 | timer: | |
616 | time = jiffies; | |
617 | time += sent < br->multicast_startup_query_count ? | |
618 | br->multicast_startup_query_interval : | |
619 | br->multicast_query_interval; | |
620 | mod_timer(port ? &port->multicast_query_timer : | |
621 | &br->multicast_query_timer, time); | |
622 | } | |
623 | ||
624 | static void br_multicast_port_query_expired(unsigned long data) | |
625 | { | |
626 | struct net_bridge_port *port = (void *)data; | |
627 | struct net_bridge *br = port->br; | |
628 | ||
629 | spin_lock(&br->multicast_lock); | |
630 | if (port && (port->state == BR_STATE_DISABLED || | |
631 | port->state == BR_STATE_BLOCKING)) | |
632 | goto out; | |
633 | ||
634 | if (port->multicast_startup_queries_sent < | |
635 | br->multicast_startup_query_count) | |
636 | port->multicast_startup_queries_sent++; | |
637 | ||
638 | br_multicast_send_query(port->br, port, | |
639 | port->multicast_startup_queries_sent); | |
640 | ||
641 | out: | |
642 | spin_unlock(&br->multicast_lock); | |
643 | } | |
644 | ||
645 | void br_multicast_add_port(struct net_bridge_port *port) | |
646 | { | |
647 | port->multicast_router = 1; | |
648 | ||
649 | setup_timer(&port->multicast_router_timer, br_multicast_router_expired, | |
650 | (unsigned long)port); | |
651 | setup_timer(&port->multicast_query_timer, | |
652 | br_multicast_port_query_expired, (unsigned long)port); | |
653 | } | |
654 | ||
655 | void br_multicast_del_port(struct net_bridge_port *port) | |
656 | { | |
657 | del_timer_sync(&port->multicast_router_timer); | |
658 | } | |
659 | ||
561f1103 HX |
660 | static void __br_multicast_enable_port(struct net_bridge_port *port) |
661 | { | |
662 | port->multicast_startup_queries_sent = 0; | |
663 | ||
664 | if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 || | |
665 | del_timer(&port->multicast_query_timer)) | |
666 | mod_timer(&port->multicast_query_timer, jiffies); | |
667 | } | |
668 | ||
eb1d1641 HX |
669 | void br_multicast_enable_port(struct net_bridge_port *port) |
670 | { | |
671 | struct net_bridge *br = port->br; | |
672 | ||
673 | spin_lock(&br->multicast_lock); | |
674 | if (br->multicast_disabled || !netif_running(br->dev)) | |
675 | goto out; | |
676 | ||
561f1103 | 677 | __br_multicast_enable_port(port); |
eb1d1641 HX |
678 | |
679 | out: | |
680 | spin_unlock(&br->multicast_lock); | |
681 | } | |
682 | ||
683 | void br_multicast_disable_port(struct net_bridge_port *port) | |
684 | { | |
685 | struct net_bridge *br = port->br; | |
686 | struct net_bridge_port_group *pg; | |
687 | struct hlist_node *p, *n; | |
688 | ||
689 | spin_lock(&br->multicast_lock); | |
690 | hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist) | |
691 | br_multicast_del_pg(br, pg); | |
692 | ||
693 | if (!hlist_unhashed(&port->rlist)) | |
694 | hlist_del_init_rcu(&port->rlist); | |
695 | del_timer(&port->multicast_router_timer); | |
696 | del_timer(&port->multicast_query_timer); | |
697 | spin_unlock(&br->multicast_lock); | |
698 | } | |
699 | ||
700 | static int br_multicast_igmp3_report(struct net_bridge *br, | |
701 | struct net_bridge_port *port, | |
702 | struct sk_buff *skb) | |
703 | { | |
704 | struct igmpv3_report *ih; | |
705 | struct igmpv3_grec *grec; | |
706 | int i; | |
707 | int len; | |
708 | int num; | |
709 | int type; | |
710 | int err = 0; | |
711 | __be32 group; | |
712 | ||
713 | if (!pskb_may_pull(skb, sizeof(*ih))) | |
714 | return -EINVAL; | |
715 | ||
716 | ih = igmpv3_report_hdr(skb); | |
717 | num = ntohs(ih->ngrec); | |
718 | len = sizeof(*ih); | |
719 | ||
720 | for (i = 0; i < num; i++) { | |
721 | len += sizeof(*grec); | |
722 | if (!pskb_may_pull(skb, len)) | |
723 | return -EINVAL; | |
724 | ||
725 | grec = (void *)(skb->data + len); | |
726 | group = grec->grec_mca; | |
727 | type = grec->grec_type; | |
728 | ||
729 | len += grec->grec_nsrcs * 4; | |
730 | if (!pskb_may_pull(skb, len)) | |
731 | return -EINVAL; | |
732 | ||
733 | /* We treat this as an IGMPv2 report for now. */ | |
734 | switch (type) { | |
735 | case IGMPV3_MODE_IS_INCLUDE: | |
736 | case IGMPV3_MODE_IS_EXCLUDE: | |
737 | case IGMPV3_CHANGE_TO_INCLUDE: | |
738 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
739 | case IGMPV3_ALLOW_NEW_SOURCES: | |
740 | case IGMPV3_BLOCK_OLD_SOURCES: | |
741 | break; | |
742 | ||
743 | default: | |
744 | continue; | |
745 | } | |
746 | ||
747 | err = br_multicast_add_group(br, port, group); | |
748 | if (err) | |
749 | break; | |
750 | } | |
751 | ||
752 | return err; | |
753 | } | |
754 | ||
0909e117 HX |
755 | static void br_multicast_add_router(struct net_bridge *br, |
756 | struct net_bridge_port *port) | |
757 | { | |
758 | struct hlist_node *p; | |
759 | struct hlist_node **h; | |
760 | ||
761 | for (h = &br->router_list.first; | |
762 | (p = *h) && | |
763 | (unsigned long)container_of(p, struct net_bridge_port, rlist) > | |
764 | (unsigned long)port; | |
765 | h = &p->next) | |
766 | ; | |
767 | ||
768 | port->rlist.pprev = h; | |
769 | port->rlist.next = p; | |
770 | rcu_assign_pointer(*h, &port->rlist); | |
771 | if (p) | |
772 | p->pprev = &port->rlist.next; | |
773 | } | |
774 | ||
eb1d1641 HX |
775 | static void br_multicast_mark_router(struct net_bridge *br, |
776 | struct net_bridge_port *port) | |
777 | { | |
778 | unsigned long now = jiffies; | |
eb1d1641 HX |
779 | |
780 | if (!port) { | |
781 | if (br->multicast_router == 1) | |
782 | mod_timer(&br->multicast_router_timer, | |
783 | now + br->multicast_querier_interval); | |
784 | return; | |
785 | } | |
786 | ||
787 | if (port->multicast_router != 1) | |
788 | return; | |
789 | ||
790 | if (!hlist_unhashed(&port->rlist)) | |
791 | goto timer; | |
792 | ||
0909e117 | 793 | br_multicast_add_router(br, port); |
eb1d1641 HX |
794 | |
795 | timer: | |
796 | mod_timer(&port->multicast_router_timer, | |
797 | now + br->multicast_querier_interval); | |
798 | } | |
799 | ||
800 | static void br_multicast_query_received(struct net_bridge *br, | |
801 | struct net_bridge_port *port, | |
802 | __be32 saddr) | |
803 | { | |
804 | if (saddr) | |
805 | mod_timer(&br->multicast_querier_timer, | |
806 | jiffies + br->multicast_querier_interval); | |
807 | else if (timer_pending(&br->multicast_querier_timer)) | |
808 | return; | |
809 | ||
810 | br_multicast_mark_router(br, port); | |
811 | } | |
812 | ||
813 | static int br_multicast_query(struct net_bridge *br, | |
814 | struct net_bridge_port *port, | |
815 | struct sk_buff *skb) | |
816 | { | |
817 | struct iphdr *iph = ip_hdr(skb); | |
818 | struct igmphdr *ih = igmp_hdr(skb); | |
819 | struct net_bridge_mdb_entry *mp; | |
820 | struct igmpv3_query *ih3; | |
821 | struct net_bridge_port_group *p; | |
822 | struct net_bridge_port_group **pp; | |
823 | unsigned long max_delay; | |
824 | unsigned long now = jiffies; | |
825 | __be32 group; | |
826 | ||
827 | spin_lock(&br->multicast_lock); | |
828 | if (!netif_running(br->dev) || | |
829 | (port && port->state == BR_STATE_DISABLED)) | |
830 | goto out; | |
831 | ||
832 | br_multicast_query_received(br, port, iph->saddr); | |
833 | ||
834 | group = ih->group; | |
835 | ||
836 | if (skb->len == sizeof(*ih)) { | |
837 | max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); | |
838 | ||
839 | if (!max_delay) { | |
840 | max_delay = 10 * HZ; | |
841 | group = 0; | |
842 | } | |
843 | } else { | |
844 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
845 | return -EINVAL; | |
846 | ||
847 | ih3 = igmpv3_query_hdr(skb); | |
848 | if (ih3->nsrcs) | |
849 | return 0; | |
850 | ||
851 | max_delay = ih3->code ? 1 : | |
852 | IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE); | |
853 | } | |
854 | ||
855 | if (!group) | |
856 | goto out; | |
857 | ||
858 | mp = br_mdb_ip_get(br->mdb, group); | |
859 | if (!mp) | |
860 | goto out; | |
861 | ||
862 | max_delay *= br->multicast_last_member_count; | |
863 | ||
864 | if (!hlist_unhashed(&mp->mglist) && | |
865 | (timer_pending(&mp->timer) ? | |
866 | time_after(mp->timer.expires, now + max_delay) : | |
867 | try_to_del_timer_sync(&mp->timer) >= 0)) | |
868 | mod_timer(&mp->timer, now + max_delay); | |
869 | ||
870 | for (pp = &mp->ports; (p = *pp); pp = &p->next) { | |
871 | if (timer_pending(&p->timer) ? | |
872 | time_after(p->timer.expires, now + max_delay) : | |
873 | try_to_del_timer_sync(&p->timer) >= 0) | |
874 | mod_timer(&mp->timer, now + max_delay); | |
875 | } | |
876 | ||
877 | out: | |
878 | spin_unlock(&br->multicast_lock); | |
879 | return 0; | |
880 | } | |
881 | ||
882 | static void br_multicast_leave_group(struct net_bridge *br, | |
883 | struct net_bridge_port *port, | |
884 | __be32 group) | |
885 | { | |
886 | struct net_bridge_mdb_htable *mdb; | |
887 | struct net_bridge_mdb_entry *mp; | |
888 | struct net_bridge_port_group *p; | |
889 | unsigned long now; | |
890 | unsigned long time; | |
891 | ||
892 | if (ipv4_is_local_multicast(group)) | |
893 | return; | |
894 | ||
895 | spin_lock(&br->multicast_lock); | |
896 | if (!netif_running(br->dev) || | |
897 | (port && port->state == BR_STATE_DISABLED) || | |
898 | timer_pending(&br->multicast_querier_timer)) | |
899 | goto out; | |
900 | ||
901 | mdb = br->mdb; | |
902 | mp = br_mdb_ip_get(mdb, group); | |
903 | if (!mp) | |
904 | goto out; | |
905 | ||
906 | now = jiffies; | |
907 | time = now + br->multicast_last_member_count * | |
908 | br->multicast_last_member_interval; | |
909 | ||
910 | if (!port) { | |
911 | if (!hlist_unhashed(&mp->mglist) && | |
912 | (timer_pending(&mp->timer) ? | |
913 | time_after(mp->timer.expires, time) : | |
914 | try_to_del_timer_sync(&mp->timer) >= 0)) { | |
915 | mod_timer(&mp->timer, time); | |
916 | ||
917 | mp->queries_sent = 0; | |
918 | mod_timer(&mp->query_timer, now); | |
919 | } | |
920 | ||
921 | goto out; | |
922 | } | |
923 | ||
924 | for (p = mp->ports; p; p = p->next) { | |
925 | if (p->port != port) | |
926 | continue; | |
927 | ||
928 | if (!hlist_unhashed(&p->mglist) && | |
929 | (timer_pending(&p->timer) ? | |
930 | time_after(p->timer.expires, time) : | |
931 | try_to_del_timer_sync(&p->timer) >= 0)) { | |
932 | mod_timer(&p->timer, time); | |
933 | ||
934 | p->queries_sent = 0; | |
935 | mod_timer(&p->query_timer, now); | |
936 | } | |
937 | ||
938 | break; | |
939 | } | |
940 | ||
941 | out: | |
942 | spin_unlock(&br->multicast_lock); | |
943 | } | |
944 | ||
945 | static int br_multicast_ipv4_rcv(struct net_bridge *br, | |
946 | struct net_bridge_port *port, | |
947 | struct sk_buff *skb) | |
948 | { | |
949 | struct sk_buff *skb2 = skb; | |
950 | struct iphdr *iph; | |
951 | struct igmphdr *ih; | |
952 | unsigned len; | |
953 | unsigned offset; | |
954 | int err; | |
955 | ||
956 | BR_INPUT_SKB_CB(skb)->igmp = 0; | |
957 | BR_INPUT_SKB_CB(skb)->mrouters_only = 0; | |
958 | ||
959 | /* We treat OOM as packet loss for now. */ | |
960 | if (!pskb_may_pull(skb, sizeof(*iph))) | |
961 | return -EINVAL; | |
962 | ||
963 | iph = ip_hdr(skb); | |
964 | ||
965 | if (iph->ihl < 5 || iph->version != 4) | |
966 | return -EINVAL; | |
967 | ||
968 | if (!pskb_may_pull(skb, ip_hdrlen(skb))) | |
969 | return -EINVAL; | |
970 | ||
971 | iph = ip_hdr(skb); | |
972 | ||
973 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
974 | return -EINVAL; | |
975 | ||
976 | if (iph->protocol != IPPROTO_IGMP) | |
977 | return 0; | |
978 | ||
979 | len = ntohs(iph->tot_len); | |
980 | if (skb->len < len || len < ip_hdrlen(skb)) | |
981 | return -EINVAL; | |
982 | ||
983 | if (skb->len > len) { | |
984 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
985 | if (!skb2) | |
986 | return -ENOMEM; | |
987 | ||
988 | err = pskb_trim_rcsum(skb2, len); | |
989 | if (err) | |
990 | return err; | |
991 | } | |
992 | ||
993 | len -= ip_hdrlen(skb2); | |
994 | offset = skb_network_offset(skb2) + ip_hdrlen(skb2); | |
995 | __skb_pull(skb2, offset); | |
996 | skb_reset_transport_header(skb2); | |
997 | ||
998 | err = -EINVAL; | |
999 | if (!pskb_may_pull(skb2, sizeof(*ih))) | |
1000 | goto out; | |
1001 | ||
1002 | iph = ip_hdr(skb2); | |
1003 | ||
1004 | switch (skb2->ip_summed) { | |
1005 | case CHECKSUM_COMPLETE: | |
1006 | if (!csum_fold(skb2->csum)) | |
1007 | break; | |
1008 | /* fall through */ | |
1009 | case CHECKSUM_NONE: | |
1010 | skb2->csum = 0; | |
1011 | if (skb_checksum_complete(skb2)) | |
1012 | return -EINVAL; | |
1013 | } | |
1014 | ||
1015 | err = 0; | |
1016 | ||
1017 | BR_INPUT_SKB_CB(skb)->igmp = 1; | |
1018 | ih = igmp_hdr(skb2); | |
1019 | ||
1020 | switch (ih->type) { | |
1021 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1022 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1023 | BR_INPUT_SKB_CB(skb2)->mrouters_only = 1; | |
1024 | err = br_multicast_add_group(br, port, ih->group); | |
1025 | break; | |
1026 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
1027 | err = br_multicast_igmp3_report(br, port, skb2); | |
1028 | break; | |
1029 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
1030 | err = br_multicast_query(br, port, skb2); | |
1031 | break; | |
1032 | case IGMP_HOST_LEAVE_MESSAGE: | |
1033 | br_multicast_leave_group(br, port, ih->group); | |
1034 | break; | |
1035 | } | |
1036 | ||
1037 | out: | |
1038 | __skb_push(skb2, offset); | |
1039 | if (skb2 != skb) | |
1040 | kfree_skb(skb2); | |
1041 | return err; | |
1042 | } | |
1043 | ||
1044 | int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, | |
1045 | struct sk_buff *skb) | |
1046 | { | |
1047 | if (br->multicast_disabled) | |
1048 | return 0; | |
1049 | ||
1050 | switch (skb->protocol) { | |
1051 | case htons(ETH_P_IP): | |
1052 | return br_multicast_ipv4_rcv(br, port, skb); | |
1053 | } | |
1054 | ||
1055 | return 0; | |
1056 | } | |
1057 | ||
1058 | static void br_multicast_query_expired(unsigned long data) | |
1059 | { | |
1060 | struct net_bridge *br = (void *)data; | |
1061 | ||
1062 | spin_lock(&br->multicast_lock); | |
1063 | if (br->multicast_startup_queries_sent < | |
1064 | br->multicast_startup_query_count) | |
1065 | br->multicast_startup_queries_sent++; | |
1066 | ||
1067 | br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent); | |
1068 | ||
1069 | spin_unlock(&br->multicast_lock); | |
1070 | } | |
1071 | ||
1072 | void br_multicast_init(struct net_bridge *br) | |
1073 | { | |
1074 | br->hash_elasticity = 4; | |
1075 | br->hash_max = 512; | |
1076 | ||
1077 | br->multicast_router = 1; | |
1078 | br->multicast_last_member_count = 2; | |
1079 | br->multicast_startup_query_count = 2; | |
1080 | ||
1081 | br->multicast_last_member_interval = HZ; | |
1082 | br->multicast_query_response_interval = 10 * HZ; | |
1083 | br->multicast_startup_query_interval = 125 * HZ / 4; | |
1084 | br->multicast_query_interval = 125 * HZ; | |
1085 | br->multicast_querier_interval = 255 * HZ; | |
1086 | br->multicast_membership_interval = 260 * HZ; | |
1087 | ||
1088 | spin_lock_init(&br->multicast_lock); | |
1089 | setup_timer(&br->multicast_router_timer, | |
1090 | br_multicast_local_router_expired, 0); | |
1091 | setup_timer(&br->multicast_querier_timer, | |
1092 | br_multicast_local_router_expired, 0); | |
1093 | setup_timer(&br->multicast_query_timer, br_multicast_query_expired, | |
1094 | (unsigned long)br); | |
1095 | } | |
1096 | ||
1097 | void br_multicast_open(struct net_bridge *br) | |
1098 | { | |
1099 | br->multicast_startup_queries_sent = 0; | |
1100 | ||
1101 | if (br->multicast_disabled) | |
1102 | return; | |
1103 | ||
1104 | mod_timer(&br->multicast_query_timer, jiffies); | |
1105 | } | |
1106 | ||
1107 | void br_multicast_stop(struct net_bridge *br) | |
1108 | { | |
1109 | struct net_bridge_mdb_htable *mdb; | |
1110 | struct net_bridge_mdb_entry *mp; | |
1111 | struct hlist_node *p, *n; | |
1112 | u32 ver; | |
1113 | int i; | |
1114 | ||
1115 | del_timer_sync(&br->multicast_router_timer); | |
1116 | del_timer_sync(&br->multicast_querier_timer); | |
1117 | del_timer_sync(&br->multicast_query_timer); | |
1118 | ||
1119 | spin_lock_bh(&br->multicast_lock); | |
1120 | mdb = br->mdb; | |
1121 | if (!mdb) | |
1122 | goto out; | |
1123 | ||
1124 | br->mdb = NULL; | |
1125 | ||
1126 | ver = mdb->ver; | |
1127 | for (i = 0; i < mdb->max; i++) { | |
1128 | hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i], | |
1129 | hlist[ver]) { | |
1130 | del_timer(&mp->timer); | |
1131 | del_timer(&mp->query_timer); | |
1132 | call_rcu_bh(&mp->rcu, br_multicast_free_group); | |
1133 | } | |
1134 | } | |
1135 | ||
1136 | if (mdb->old) { | |
1137 | spin_unlock_bh(&br->multicast_lock); | |
1138 | synchronize_rcu_bh(); | |
1139 | spin_lock_bh(&br->multicast_lock); | |
1140 | WARN_ON(mdb->old); | |
1141 | } | |
1142 | ||
1143 | mdb->old = mdb; | |
1144 | call_rcu_bh(&mdb->rcu, br_mdb_free); | |
1145 | ||
1146 | out: | |
1147 | spin_unlock_bh(&br->multicast_lock); | |
1148 | } | |
0909e117 HX |
1149 | |
1150 | int br_multicast_set_router(struct net_bridge *br, unsigned long val) | |
1151 | { | |
1152 | int err = -ENOENT; | |
1153 | ||
1154 | spin_lock_bh(&br->multicast_lock); | |
1155 | if (!netif_running(br->dev)) | |
1156 | goto unlock; | |
1157 | ||
1158 | switch (val) { | |
1159 | case 0: | |
1160 | case 2: | |
1161 | del_timer(&br->multicast_router_timer); | |
1162 | /* fall through */ | |
1163 | case 1: | |
1164 | br->multicast_router = val; | |
1165 | err = 0; | |
1166 | break; | |
1167 | ||
1168 | default: | |
1169 | err = -EINVAL; | |
1170 | break; | |
1171 | } | |
1172 | ||
1173 | unlock: | |
1174 | spin_unlock_bh(&br->multicast_lock); | |
1175 | ||
1176 | return err; | |
1177 | } | |
1178 | ||
1179 | int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) | |
1180 | { | |
1181 | struct net_bridge *br = p->br; | |
1182 | int err = -ENOENT; | |
1183 | ||
1184 | spin_lock(&br->multicast_lock); | |
1185 | if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED) | |
1186 | goto unlock; | |
1187 | ||
1188 | switch (val) { | |
1189 | case 0: | |
1190 | case 1: | |
1191 | case 2: | |
1192 | p->multicast_router = val; | |
1193 | err = 0; | |
1194 | ||
1195 | if (val < 2 && !hlist_unhashed(&p->rlist)) | |
1196 | hlist_del_init_rcu(&p->rlist); | |
1197 | ||
1198 | if (val == 1) | |
1199 | break; | |
1200 | ||
1201 | del_timer(&p->multicast_router_timer); | |
1202 | ||
1203 | if (val == 0) | |
1204 | break; | |
1205 | ||
1206 | br_multicast_add_router(br, p); | |
1207 | break; | |
1208 | ||
1209 | default: | |
1210 | err = -EINVAL; | |
1211 | break; | |
1212 | } | |
1213 | ||
1214 | unlock: | |
1215 | spin_unlock(&br->multicast_lock); | |
1216 | ||
1217 | return err; | |
1218 | } | |
561f1103 HX |
1219 | |
1220 | int br_multicast_toggle(struct net_bridge *br, unsigned long val) | |
1221 | { | |
1222 | struct net_bridge_port *port; | |
1223 | int err = -ENOENT; | |
1224 | ||
1225 | spin_lock(&br->multicast_lock); | |
1226 | if (!netif_running(br->dev)) | |
1227 | goto unlock; | |
1228 | ||
1229 | err = 0; | |
1230 | if (br->multicast_disabled == !val) | |
1231 | goto unlock; | |
1232 | ||
1233 | br->multicast_disabled = !val; | |
1234 | if (br->multicast_disabled) | |
1235 | goto unlock; | |
1236 | ||
1237 | if (br->mdb) { | |
1238 | if (br->mdb->old) { | |
1239 | err = -EEXIST; | |
1240 | rollback: | |
1241 | br->multicast_disabled = !!val; | |
1242 | goto unlock; | |
1243 | } | |
1244 | ||
1245 | err = br_mdb_rehash(&br->mdb, br->mdb->max, | |
1246 | br->hash_elasticity); | |
1247 | if (err) | |
1248 | goto rollback; | |
1249 | } | |
1250 | ||
1251 | br_multicast_open(br); | |
1252 | list_for_each_entry(port, &br->port_list, list) { | |
1253 | if (port->state == BR_STATE_DISABLED || | |
1254 | port->state == BR_STATE_BLOCKING) | |
1255 | continue; | |
1256 | ||
1257 | __br_multicast_enable_port(port); | |
1258 | } | |
1259 | ||
1260 | unlock: | |
1261 | spin_unlock(&br->multicast_lock); | |
1262 | ||
1263 | return err; | |
1264 | } | |
b195167f HX |
1265 | |
1266 | int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) | |
1267 | { | |
1268 | int err = -ENOENT; | |
1269 | u32 old; | |
1270 | ||
1271 | spin_lock(&br->multicast_lock); | |
1272 | if (!netif_running(br->dev)) | |
1273 | goto unlock; | |
1274 | ||
1275 | err = -EINVAL; | |
1276 | if (!is_power_of_2(val)) | |
1277 | goto unlock; | |
1278 | if (br->mdb && val < br->mdb->size) | |
1279 | goto unlock; | |
1280 | ||
1281 | err = 0; | |
1282 | ||
1283 | old = br->hash_max; | |
1284 | br->hash_max = val; | |
1285 | ||
1286 | if (br->mdb) { | |
1287 | if (br->mdb->old) { | |
1288 | err = -EEXIST; | |
1289 | rollback: | |
1290 | br->hash_max = old; | |
1291 | goto unlock; | |
1292 | } | |
1293 | ||
1294 | err = br_mdb_rehash(&br->mdb, br->hash_max, | |
1295 | br->hash_elasticity); | |
1296 | if (err) | |
1297 | goto rollback; | |
1298 | } | |
1299 | ||
1300 | unlock: | |
1301 | spin_unlock(&br->multicast_lock); | |
1302 | ||
1303 | return err; | |
1304 | } |