Commit | Line | Data |
---|---|---|
eb1d1641 HX |
1 | /* |
2 | * Bridge multicast support. | |
3 | * | |
4 | * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the Free | |
8 | * Software Foundation; either version 2 of the License, or (at your option) | |
9 | * any later version. | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/err.h> | |
14 | #include <linux/if_ether.h> | |
15 | #include <linux/igmp.h> | |
16 | #include <linux/jhash.h> | |
17 | #include <linux/kernel.h> | |
b195167f | 18 | #include <linux/log2.h> |
eb1d1641 HX |
19 | #include <linux/netdevice.h> |
20 | #include <linux/netfilter_bridge.h> | |
21 | #include <linux/random.h> | |
22 | #include <linux/rculist.h> | |
23 | #include <linux/skbuff.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/timer.h> | |
26 | #include <net/ip.h> | |
08b202b6 YH |
27 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
28 | #include <net/ipv6.h> | |
29 | #include <net/mld.h> | |
30 | #include <net/addrconf.h> | |
d4c4f07d | 31 | #include <net/ip6_checksum.h> |
08b202b6 | 32 | #endif |
eb1d1641 HX |
33 | |
34 | #include "br_private.h" | |
35 | ||
e8051688 ED |
36 | #define mlock_dereference(X, br) \ |
37 | rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) | |
38 | ||
08b202b6 YH |
39 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
40 | static inline int ipv6_is_local_multicast(const struct in6_addr *addr) | |
eb1d1641 | 41 | { |
08b202b6 YH |
42 | if (ipv6_addr_is_multicast(addr) && |
43 | IPV6_ADDR_MC_SCOPE(addr) <= IPV6_ADDR_SCOPE_LINKLOCAL) | |
44 | return 1; | |
45 | return 0; | |
46 | } | |
47 | #endif | |
48 | ||
8ef2a9a5 YH |
49 | static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b) |
50 | { | |
51 | if (a->proto != b->proto) | |
52 | return 0; | |
53 | switch (a->proto) { | |
54 | case htons(ETH_P_IP): | |
55 | return a->u.ip4 == b->u.ip4; | |
08b202b6 YH |
56 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
57 | case htons(ETH_P_IPV6): | |
58 | return ipv6_addr_equal(&a->u.ip6, &b->u.ip6); | |
59 | #endif | |
8ef2a9a5 YH |
60 | } |
61 | return 0; | |
62 | } | |
63 | ||
64 | static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip) | |
eb1d1641 | 65 | { |
0eae88f3 | 66 | return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1); |
eb1d1641 HX |
67 | } |
68 | ||
08b202b6 YH |
69 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
70 | static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb, | |
71 | const struct in6_addr *ip) | |
72 | { | |
73 | return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1); | |
74 | } | |
75 | #endif | |
76 | ||
8ef2a9a5 YH |
77 | static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb, |
78 | struct br_ip *ip) | |
79 | { | |
80 | switch (ip->proto) { | |
81 | case htons(ETH_P_IP): | |
82 | return __br_ip4_hash(mdb, ip->u.ip4); | |
08b202b6 YH |
83 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
84 | case htons(ETH_P_IPV6): | |
85 | return __br_ip6_hash(mdb, &ip->u.ip6); | |
86 | #endif | |
8ef2a9a5 YH |
87 | } |
88 | return 0; | |
eb1d1641 HX |
89 | } |
90 | ||
91 | static struct net_bridge_mdb_entry *__br_mdb_ip_get( | |
8ef2a9a5 | 92 | struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash) |
eb1d1641 HX |
93 | { |
94 | struct net_bridge_mdb_entry *mp; | |
95 | struct hlist_node *p; | |
96 | ||
49f5fcfd | 97 | hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) { |
8ef2a9a5 | 98 | if (br_ip_equal(&mp->addr, dst)) |
eb1d1641 HX |
99 | return mp; |
100 | } | |
101 | ||
102 | return NULL; | |
103 | } | |
104 | ||
7f285fa7 HX |
105 | static struct net_bridge_mdb_entry *br_mdb_ip_get( |
106 | struct net_bridge_mdb_htable *mdb, struct br_ip *dst) | |
107 | { | |
108 | if (!mdb) | |
109 | return NULL; | |
110 | ||
111 | return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst)); | |
112 | } | |
113 | ||
8ef2a9a5 | 114 | static struct net_bridge_mdb_entry *br_mdb_ip4_get( |
eb1d1641 HX |
115 | struct net_bridge_mdb_htable *mdb, __be32 dst) |
116 | { | |
8ef2a9a5 YH |
117 | struct br_ip br_dst; |
118 | ||
119 | br_dst.u.ip4 = dst; | |
120 | br_dst.proto = htons(ETH_P_IP); | |
0821ec55 | 121 | |
7f285fa7 | 122 | return br_mdb_ip_get(mdb, &br_dst); |
8ef2a9a5 YH |
123 | } |
124 | ||
08b202b6 YH |
125 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
126 | static struct net_bridge_mdb_entry *br_mdb_ip6_get( | |
127 | struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst) | |
128 | { | |
129 | struct br_ip br_dst; | |
0821ec55 | 130 | |
08b202b6 YH |
131 | ipv6_addr_copy(&br_dst.u.ip6, dst); |
132 | br_dst.proto = htons(ETH_P_IPV6); | |
133 | ||
7f285fa7 | 134 | return br_mdb_ip_get(mdb, &br_dst); |
08b202b6 YH |
135 | } |
136 | #endif | |
137 | ||
eb1d1641 HX |
138 | struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, |
139 | struct sk_buff *skb) | |
140 | { | |
e8051688 | 141 | struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb); |
8ef2a9a5 YH |
142 | struct br_ip ip; |
143 | ||
7f285fa7 | 144 | if (br->multicast_disabled) |
eb1d1641 HX |
145 | return NULL; |
146 | ||
8ef2a9a5 | 147 | if (BR_INPUT_SKB_CB(skb)->igmp) |
eb1d1641 HX |
148 | return NULL; |
149 | ||
8ef2a9a5 YH |
150 | ip.proto = skb->protocol; |
151 | ||
eb1d1641 HX |
152 | switch (skb->protocol) { |
153 | case htons(ETH_P_IP): | |
8ef2a9a5 YH |
154 | ip.u.ip4 = ip_hdr(skb)->daddr; |
155 | break; | |
08b202b6 YH |
156 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
157 | case htons(ETH_P_IPV6): | |
158 | ipv6_addr_copy(&ip.u.ip6, &ipv6_hdr(skb)->daddr); | |
159 | break; | |
160 | #endif | |
8ef2a9a5 YH |
161 | default: |
162 | return NULL; | |
eb1d1641 HX |
163 | } |
164 | ||
8ef2a9a5 | 165 | return br_mdb_ip_get(mdb, &ip); |
eb1d1641 HX |
166 | } |
167 | ||
168 | static void br_mdb_free(struct rcu_head *head) | |
169 | { | |
170 | struct net_bridge_mdb_htable *mdb = | |
171 | container_of(head, struct net_bridge_mdb_htable, rcu); | |
172 | struct net_bridge_mdb_htable *old = mdb->old; | |
173 | ||
174 | mdb->old = NULL; | |
175 | kfree(old->mhash); | |
176 | kfree(old); | |
177 | } | |
178 | ||
179 | static int br_mdb_copy(struct net_bridge_mdb_htable *new, | |
180 | struct net_bridge_mdb_htable *old, | |
181 | int elasticity) | |
182 | { | |
183 | struct net_bridge_mdb_entry *mp; | |
184 | struct hlist_node *p; | |
185 | int maxlen; | |
186 | int len; | |
187 | int i; | |
188 | ||
189 | for (i = 0; i < old->max; i++) | |
190 | hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver]) | |
191 | hlist_add_head(&mp->hlist[new->ver], | |
8ef2a9a5 | 192 | &new->mhash[br_ip_hash(new, &mp->addr)]); |
eb1d1641 HX |
193 | |
194 | if (!elasticity) | |
195 | return 0; | |
196 | ||
197 | maxlen = 0; | |
198 | for (i = 0; i < new->max; i++) { | |
199 | len = 0; | |
200 | hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver]) | |
201 | len++; | |
202 | if (len > maxlen) | |
203 | maxlen = len; | |
204 | } | |
205 | ||
206 | return maxlen > elasticity ? -EINVAL : 0; | |
207 | } | |
208 | ||
209 | static void br_multicast_free_pg(struct rcu_head *head) | |
210 | { | |
211 | struct net_bridge_port_group *p = | |
212 | container_of(head, struct net_bridge_port_group, rcu); | |
213 | ||
214 | kfree(p); | |
215 | } | |
216 | ||
217 | static void br_multicast_free_group(struct rcu_head *head) | |
218 | { | |
219 | struct net_bridge_mdb_entry *mp = | |
220 | container_of(head, struct net_bridge_mdb_entry, rcu); | |
221 | ||
222 | kfree(mp); | |
223 | } | |
224 | ||
225 | static void br_multicast_group_expired(unsigned long data) | |
226 | { | |
227 | struct net_bridge_mdb_entry *mp = (void *)data; | |
228 | struct net_bridge *br = mp->br; | |
229 | struct net_bridge_mdb_htable *mdb; | |
230 | ||
231 | spin_lock(&br->multicast_lock); | |
232 | if (!netif_running(br->dev) || timer_pending(&mp->timer)) | |
233 | goto out; | |
234 | ||
235 | if (!hlist_unhashed(&mp->mglist)) | |
236 | hlist_del_init(&mp->mglist); | |
237 | ||
238 | if (mp->ports) | |
239 | goto out; | |
240 | ||
e8051688 ED |
241 | mdb = mlock_dereference(br->mdb, br); |
242 | ||
eb1d1641 HX |
243 | hlist_del_rcu(&mp->hlist[mdb->ver]); |
244 | mdb->size--; | |
245 | ||
246 | del_timer(&mp->query_timer); | |
247 | call_rcu_bh(&mp->rcu, br_multicast_free_group); | |
248 | ||
249 | out: | |
250 | spin_unlock(&br->multicast_lock); | |
251 | } | |
252 | ||
253 | static void br_multicast_del_pg(struct net_bridge *br, | |
254 | struct net_bridge_port_group *pg) | |
255 | { | |
e8051688 | 256 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 HX |
257 | struct net_bridge_mdb_entry *mp; |
258 | struct net_bridge_port_group *p; | |
e8051688 ED |
259 | struct net_bridge_port_group __rcu **pp; |
260 | ||
261 | mdb = mlock_dereference(br->mdb, br); | |
eb1d1641 | 262 | |
8ef2a9a5 | 263 | mp = br_mdb_ip_get(mdb, &pg->addr); |
eb1d1641 HX |
264 | if (WARN_ON(!mp)) |
265 | return; | |
266 | ||
e8051688 ED |
267 | for (pp = &mp->ports; |
268 | (p = mlock_dereference(*pp, br)) != NULL; | |
269 | pp = &p->next) { | |
eb1d1641 HX |
270 | if (p != pg) |
271 | continue; | |
272 | ||
83f6a740 | 273 | rcu_assign_pointer(*pp, p->next); |
eb1d1641 HX |
274 | hlist_del_init(&p->mglist); |
275 | del_timer(&p->timer); | |
276 | del_timer(&p->query_timer); | |
277 | call_rcu_bh(&p->rcu, br_multicast_free_pg); | |
278 | ||
279 | if (!mp->ports && hlist_unhashed(&mp->mglist) && | |
280 | netif_running(br->dev)) | |
281 | mod_timer(&mp->timer, jiffies); | |
282 | ||
283 | return; | |
284 | } | |
285 | ||
286 | WARN_ON(1); | |
287 | } | |
288 | ||
289 | static void br_multicast_port_group_expired(unsigned long data) | |
290 | { | |
291 | struct net_bridge_port_group *pg = (void *)data; | |
292 | struct net_bridge *br = pg->port->br; | |
293 | ||
294 | spin_lock(&br->multicast_lock); | |
295 | if (!netif_running(br->dev) || timer_pending(&pg->timer) || | |
296 | hlist_unhashed(&pg->mglist)) | |
297 | goto out; | |
298 | ||
299 | br_multicast_del_pg(br, pg); | |
300 | ||
301 | out: | |
302 | spin_unlock(&br->multicast_lock); | |
303 | } | |
304 | ||
e8051688 | 305 | static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max, |
eb1d1641 HX |
306 | int elasticity) |
307 | { | |
e8051688 | 308 | struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1); |
eb1d1641 HX |
309 | struct net_bridge_mdb_htable *mdb; |
310 | int err; | |
311 | ||
312 | mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC); | |
313 | if (!mdb) | |
314 | return -ENOMEM; | |
315 | ||
316 | mdb->max = max; | |
317 | mdb->old = old; | |
318 | ||
319 | mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC); | |
320 | if (!mdb->mhash) { | |
321 | kfree(mdb); | |
322 | return -ENOMEM; | |
323 | } | |
324 | ||
325 | mdb->size = old ? old->size : 0; | |
326 | mdb->ver = old ? old->ver ^ 1 : 0; | |
327 | ||
328 | if (!old || elasticity) | |
329 | get_random_bytes(&mdb->secret, sizeof(mdb->secret)); | |
330 | else | |
331 | mdb->secret = old->secret; | |
332 | ||
333 | if (!old) | |
334 | goto out; | |
335 | ||
336 | err = br_mdb_copy(mdb, old, elasticity); | |
337 | if (err) { | |
338 | kfree(mdb->mhash); | |
339 | kfree(mdb); | |
340 | return err; | |
341 | } | |
342 | ||
343 | call_rcu_bh(&mdb->rcu, br_mdb_free); | |
344 | ||
345 | out: | |
346 | rcu_assign_pointer(*mdbp, mdb); | |
347 | ||
348 | return 0; | |
349 | } | |
350 | ||
8ef2a9a5 YH |
351 | static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br, |
352 | __be32 group) | |
eb1d1641 HX |
353 | { |
354 | struct sk_buff *skb; | |
355 | struct igmphdr *ih; | |
356 | struct ethhdr *eth; | |
357 | struct iphdr *iph; | |
358 | ||
359 | skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) + | |
360 | sizeof(*ih) + 4); | |
361 | if (!skb) | |
362 | goto out; | |
363 | ||
364 | skb->protocol = htons(ETH_P_IP); | |
365 | ||
366 | skb_reset_mac_header(skb); | |
367 | eth = eth_hdr(skb); | |
368 | ||
369 | memcpy(eth->h_source, br->dev->dev_addr, 6); | |
370 | eth->h_dest[0] = 1; | |
371 | eth->h_dest[1] = 0; | |
372 | eth->h_dest[2] = 0x5e; | |
373 | eth->h_dest[3] = 0; | |
374 | eth->h_dest[4] = 0; | |
375 | eth->h_dest[5] = 1; | |
376 | eth->h_proto = htons(ETH_P_IP); | |
377 | skb_put(skb, sizeof(*eth)); | |
378 | ||
379 | skb_set_network_header(skb, skb->len); | |
380 | iph = ip_hdr(skb); | |
381 | ||
382 | iph->version = 4; | |
383 | iph->ihl = 6; | |
384 | iph->tos = 0xc0; | |
385 | iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4); | |
386 | iph->id = 0; | |
387 | iph->frag_off = htons(IP_DF); | |
388 | iph->ttl = 1; | |
389 | iph->protocol = IPPROTO_IGMP; | |
390 | iph->saddr = 0; | |
391 | iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); | |
392 | ((u8 *)&iph[1])[0] = IPOPT_RA; | |
393 | ((u8 *)&iph[1])[1] = 4; | |
394 | ((u8 *)&iph[1])[2] = 0; | |
395 | ((u8 *)&iph[1])[3] = 0; | |
396 | ip_send_check(iph); | |
397 | skb_put(skb, 24); | |
398 | ||
399 | skb_set_transport_header(skb, skb->len); | |
400 | ih = igmp_hdr(skb); | |
401 | ih->type = IGMP_HOST_MEMBERSHIP_QUERY; | |
402 | ih->code = (group ? br->multicast_last_member_interval : | |
403 | br->multicast_query_response_interval) / | |
404 | (HZ / IGMP_TIMER_SCALE); | |
405 | ih->group = group; | |
406 | ih->csum = 0; | |
407 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
408 | skb_put(skb, sizeof(*ih)); | |
409 | ||
410 | __skb_pull(skb, sizeof(*eth)); | |
411 | ||
412 | out: | |
413 | return skb; | |
414 | } | |
415 | ||
08b202b6 YH |
416 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
417 | static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, | |
418 | struct in6_addr *group) | |
419 | { | |
420 | struct sk_buff *skb; | |
421 | struct ipv6hdr *ip6h; | |
422 | struct mld_msg *mldq; | |
423 | struct ethhdr *eth; | |
424 | u8 *hopopt; | |
425 | unsigned long interval; | |
426 | ||
427 | skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) + | |
428 | 8 + sizeof(*mldq)); | |
429 | if (!skb) | |
430 | goto out; | |
431 | ||
432 | skb->protocol = htons(ETH_P_IPV6); | |
433 | ||
434 | /* Ethernet header */ | |
435 | skb_reset_mac_header(skb); | |
436 | eth = eth_hdr(skb); | |
437 | ||
438 | memcpy(eth->h_source, br->dev->dev_addr, 6); | |
439 | ipv6_eth_mc_map(group, eth->h_dest); | |
440 | eth->h_proto = htons(ETH_P_IPV6); | |
441 | skb_put(skb, sizeof(*eth)); | |
442 | ||
443 | /* IPv6 header + HbH option */ | |
444 | skb_set_network_header(skb, skb->len); | |
445 | ip6h = ipv6_hdr(skb); | |
446 | ||
447 | *(__force __be32 *)ip6h = htonl(0x60000000); | |
76d66158 | 448 | ip6h->payload_len = htons(8 + sizeof(*mldq)); |
08b202b6 YH |
449 | ip6h->nexthdr = IPPROTO_HOPOPTS; |
450 | ip6h->hop_limit = 1; | |
451 | ipv6_addr_set(&ip6h->saddr, 0, 0, 0, 0); | |
452 | ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1)); | |
453 | ||
454 | hopopt = (u8 *)(ip6h + 1); | |
455 | hopopt[0] = IPPROTO_ICMPV6; /* next hdr */ | |
456 | hopopt[1] = 0; /* length of HbH */ | |
457 | hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */ | |
458 | hopopt[3] = 2; /* Length of RA Option */ | |
459 | hopopt[4] = 0; /* Type = 0x0000 (MLD) */ | |
460 | hopopt[5] = 0; | |
461 | hopopt[6] = IPV6_TLV_PAD0; /* Pad0 */ | |
462 | hopopt[7] = IPV6_TLV_PAD0; /* Pad0 */ | |
463 | ||
464 | skb_put(skb, sizeof(*ip6h) + 8); | |
465 | ||
466 | /* ICMPv6 */ | |
467 | skb_set_transport_header(skb, skb->len); | |
468 | mldq = (struct mld_msg *) icmp6_hdr(skb); | |
469 | ||
470 | interval = ipv6_addr_any(group) ? br->multicast_last_member_interval : | |
471 | br->multicast_query_response_interval; | |
472 | ||
473 | mldq->mld_type = ICMPV6_MGM_QUERY; | |
474 | mldq->mld_code = 0; | |
475 | mldq->mld_cksum = 0; | |
476 | mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); | |
477 | mldq->mld_reserved = 0; | |
478 | ipv6_addr_copy(&mldq->mld_mca, group); | |
479 | ||
480 | /* checksum */ | |
481 | mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
482 | sizeof(*mldq), IPPROTO_ICMPV6, | |
483 | csum_partial(mldq, | |
484 | sizeof(*mldq), 0)); | |
485 | skb_put(skb, sizeof(*mldq)); | |
486 | ||
487 | __skb_pull(skb, sizeof(*eth)); | |
488 | ||
489 | out: | |
490 | return skb; | |
491 | } | |
492 | #endif | |
493 | ||
8ef2a9a5 YH |
494 | static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, |
495 | struct br_ip *addr) | |
496 | { | |
497 | switch (addr->proto) { | |
498 | case htons(ETH_P_IP): | |
499 | return br_ip4_multicast_alloc_query(br, addr->u.ip4); | |
08b202b6 YH |
500 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
501 | case htons(ETH_P_IPV6): | |
502 | return br_ip6_multicast_alloc_query(br, &addr->u.ip6); | |
503 | #endif | |
8ef2a9a5 YH |
504 | } |
505 | return NULL; | |
506 | } | |
507 | ||
eb1d1641 HX |
508 | static void br_multicast_send_group_query(struct net_bridge_mdb_entry *mp) |
509 | { | |
510 | struct net_bridge *br = mp->br; | |
511 | struct sk_buff *skb; | |
512 | ||
8ef2a9a5 | 513 | skb = br_multicast_alloc_query(br, &mp->addr); |
eb1d1641 HX |
514 | if (!skb) |
515 | goto timer; | |
516 | ||
517 | netif_rx(skb); | |
518 | ||
519 | timer: | |
520 | if (++mp->queries_sent < br->multicast_last_member_count) | |
521 | mod_timer(&mp->query_timer, | |
522 | jiffies + br->multicast_last_member_interval); | |
523 | } | |
524 | ||
525 | static void br_multicast_group_query_expired(unsigned long data) | |
526 | { | |
527 | struct net_bridge_mdb_entry *mp = (void *)data; | |
528 | struct net_bridge *br = mp->br; | |
529 | ||
530 | spin_lock(&br->multicast_lock); | |
531 | if (!netif_running(br->dev) || hlist_unhashed(&mp->mglist) || | |
532 | mp->queries_sent >= br->multicast_last_member_count) | |
533 | goto out; | |
534 | ||
535 | br_multicast_send_group_query(mp); | |
536 | ||
537 | out: | |
538 | spin_unlock(&br->multicast_lock); | |
539 | } | |
540 | ||
541 | static void br_multicast_send_port_group_query(struct net_bridge_port_group *pg) | |
542 | { | |
543 | struct net_bridge_port *port = pg->port; | |
544 | struct net_bridge *br = port->br; | |
545 | struct sk_buff *skb; | |
546 | ||
8ef2a9a5 | 547 | skb = br_multicast_alloc_query(br, &pg->addr); |
eb1d1641 HX |
548 | if (!skb) |
549 | goto timer; | |
550 | ||
551 | br_deliver(port, skb); | |
552 | ||
553 | timer: | |
554 | if (++pg->queries_sent < br->multicast_last_member_count) | |
555 | mod_timer(&pg->query_timer, | |
556 | jiffies + br->multicast_last_member_interval); | |
557 | } | |
558 | ||
559 | static void br_multicast_port_group_query_expired(unsigned long data) | |
560 | { | |
561 | struct net_bridge_port_group *pg = (void *)data; | |
562 | struct net_bridge_port *port = pg->port; | |
563 | struct net_bridge *br = port->br; | |
564 | ||
565 | spin_lock(&br->multicast_lock); | |
566 | if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) || | |
567 | pg->queries_sent >= br->multicast_last_member_count) | |
568 | goto out; | |
569 | ||
570 | br_multicast_send_port_group_query(pg); | |
571 | ||
572 | out: | |
573 | spin_unlock(&br->multicast_lock); | |
574 | } | |
575 | ||
576 | static struct net_bridge_mdb_entry *br_multicast_get_group( | |
8ef2a9a5 YH |
577 | struct net_bridge *br, struct net_bridge_port *port, |
578 | struct br_ip *group, int hash) | |
eb1d1641 | 579 | { |
e8051688 | 580 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 HX |
581 | struct net_bridge_mdb_entry *mp; |
582 | struct hlist_node *p; | |
583 | unsigned count = 0; | |
584 | unsigned max; | |
585 | int elasticity; | |
586 | int err; | |
587 | ||
e8051688 | 588 | mdb = rcu_dereference_protected(br->mdb, 1); |
eb1d1641 HX |
589 | hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) { |
590 | count++; | |
8ef2a9a5 | 591 | if (unlikely(br_ip_equal(group, &mp->addr))) |
eb1d1641 | 592 | return mp; |
eb1d1641 HX |
593 | } |
594 | ||
595 | elasticity = 0; | |
596 | max = mdb->max; | |
597 | ||
598 | if (unlikely(count > br->hash_elasticity && count)) { | |
599 | if (net_ratelimit()) | |
28a16c97 | 600 | br_info(br, "Multicast hash table " |
601 | "chain limit reached: %s\n", | |
602 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
603 | |
604 | elasticity = br->hash_elasticity; | |
605 | } | |
606 | ||
607 | if (mdb->size >= max) { | |
608 | max *= 2; | |
609 | if (unlikely(max >= br->hash_max)) { | |
28a16c97 | 610 | br_warn(br, "Multicast hash table maximum " |
611 | "reached, disabling snooping: %s, %d\n", | |
612 | port ? port->dev->name : br->dev->name, max); | |
eb1d1641 HX |
613 | err = -E2BIG; |
614 | disable: | |
615 | br->multicast_disabled = 1; | |
616 | goto err; | |
617 | } | |
618 | } | |
619 | ||
620 | if (max > mdb->max || elasticity) { | |
621 | if (mdb->old) { | |
622 | if (net_ratelimit()) | |
28a16c97 | 623 | br_info(br, "Multicast hash table " |
624 | "on fire: %s\n", | |
625 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
626 | err = -EEXIST; |
627 | goto err; | |
628 | } | |
629 | ||
630 | err = br_mdb_rehash(&br->mdb, max, elasticity); | |
631 | if (err) { | |
28a16c97 | 632 | br_warn(br, "Cannot rehash multicast " |
633 | "hash table, disabling snooping: %s, %d, %d\n", | |
634 | port ? port->dev->name : br->dev->name, | |
635 | mdb->size, err); | |
eb1d1641 HX |
636 | goto disable; |
637 | } | |
638 | ||
639 | err = -EAGAIN; | |
640 | goto err; | |
641 | } | |
642 | ||
643 | return NULL; | |
644 | ||
645 | err: | |
646 | mp = ERR_PTR(err); | |
647 | return mp; | |
648 | } | |
649 | ||
650 | static struct net_bridge_mdb_entry *br_multicast_new_group( | |
8ef2a9a5 YH |
651 | struct net_bridge *br, struct net_bridge_port *port, |
652 | struct br_ip *group) | |
eb1d1641 | 653 | { |
e8051688 | 654 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 HX |
655 | struct net_bridge_mdb_entry *mp; |
656 | int hash; | |
4c0833bc | 657 | int err; |
eb1d1641 | 658 | |
e8051688 | 659 | mdb = rcu_dereference_protected(br->mdb, 1); |
eb1d1641 | 660 | if (!mdb) { |
4c0833bc TK |
661 | err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0); |
662 | if (err) | |
663 | return ERR_PTR(err); | |
eb1d1641 HX |
664 | goto rehash; |
665 | } | |
666 | ||
667 | hash = br_ip_hash(mdb, group); | |
668 | mp = br_multicast_get_group(br, port, group, hash); | |
669 | switch (PTR_ERR(mp)) { | |
670 | case 0: | |
671 | break; | |
672 | ||
673 | case -EAGAIN: | |
674 | rehash: | |
e8051688 | 675 | mdb = rcu_dereference_protected(br->mdb, 1); |
eb1d1641 HX |
676 | hash = br_ip_hash(mdb, group); |
677 | break; | |
678 | ||
679 | default: | |
680 | goto out; | |
681 | } | |
682 | ||
683 | mp = kzalloc(sizeof(*mp), GFP_ATOMIC); | |
684 | if (unlikely(!mp)) | |
4c0833bc | 685 | return ERR_PTR(-ENOMEM); |
eb1d1641 HX |
686 | |
687 | mp->br = br; | |
8ef2a9a5 | 688 | mp->addr = *group; |
eb1d1641 HX |
689 | setup_timer(&mp->timer, br_multicast_group_expired, |
690 | (unsigned long)mp); | |
691 | setup_timer(&mp->query_timer, br_multicast_group_query_expired, | |
692 | (unsigned long)mp); | |
693 | ||
694 | hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]); | |
695 | mdb->size++; | |
696 | ||
697 | out: | |
698 | return mp; | |
699 | } | |
700 | ||
701 | static int br_multicast_add_group(struct net_bridge *br, | |
8ef2a9a5 YH |
702 | struct net_bridge_port *port, |
703 | struct br_ip *group) | |
eb1d1641 HX |
704 | { |
705 | struct net_bridge_mdb_entry *mp; | |
706 | struct net_bridge_port_group *p; | |
e8051688 | 707 | struct net_bridge_port_group __rcu **pp; |
eb1d1641 HX |
708 | unsigned long now = jiffies; |
709 | int err; | |
710 | ||
eb1d1641 HX |
711 | spin_lock(&br->multicast_lock); |
712 | if (!netif_running(br->dev) || | |
713 | (port && port->state == BR_STATE_DISABLED)) | |
714 | goto out; | |
715 | ||
716 | mp = br_multicast_new_group(br, port, group); | |
717 | err = PTR_ERR(mp); | |
4c0833bc | 718 | if (IS_ERR(mp)) |
eb1d1641 HX |
719 | goto err; |
720 | ||
721 | if (!port) { | |
6b0d6a9b HX |
722 | if (hlist_unhashed(&mp->mglist)) |
723 | hlist_add_head(&mp->mglist, &br->mglist); | |
eb1d1641 HX |
724 | mod_timer(&mp->timer, now + br->multicast_membership_interval); |
725 | goto out; | |
726 | } | |
727 | ||
e8051688 ED |
728 | for (pp = &mp->ports; |
729 | (p = mlock_dereference(*pp, br)) != NULL; | |
730 | pp = &p->next) { | |
eb1d1641 HX |
731 | if (p->port == port) |
732 | goto found; | |
733 | if ((unsigned long)p->port < (unsigned long)port) | |
734 | break; | |
735 | } | |
736 | ||
737 | p = kzalloc(sizeof(*p), GFP_ATOMIC); | |
738 | err = -ENOMEM; | |
739 | if (unlikely(!p)) | |
740 | goto err; | |
741 | ||
8ef2a9a5 | 742 | p->addr = *group; |
eb1d1641 HX |
743 | p->port = port; |
744 | p->next = *pp; | |
745 | hlist_add_head(&p->mglist, &port->mglist); | |
746 | setup_timer(&p->timer, br_multicast_port_group_expired, | |
747 | (unsigned long)p); | |
748 | setup_timer(&p->query_timer, br_multicast_port_group_query_expired, | |
749 | (unsigned long)p); | |
750 | ||
751 | rcu_assign_pointer(*pp, p); | |
752 | ||
753 | found: | |
754 | mod_timer(&p->timer, now + br->multicast_membership_interval); | |
755 | out: | |
756 | err = 0; | |
757 | ||
758 | err: | |
759 | spin_unlock(&br->multicast_lock); | |
760 | return err; | |
761 | } | |
762 | ||
8ef2a9a5 YH |
763 | static int br_ip4_multicast_add_group(struct net_bridge *br, |
764 | struct net_bridge_port *port, | |
765 | __be32 group) | |
766 | { | |
767 | struct br_ip br_group; | |
768 | ||
769 | if (ipv4_is_local_multicast(group)) | |
770 | return 0; | |
771 | ||
772 | br_group.u.ip4 = group; | |
773 | br_group.proto = htons(ETH_P_IP); | |
774 | ||
775 | return br_multicast_add_group(br, port, &br_group); | |
776 | } | |
777 | ||
08b202b6 YH |
778 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
779 | static int br_ip6_multicast_add_group(struct net_bridge *br, | |
780 | struct net_bridge_port *port, | |
781 | const struct in6_addr *group) | |
782 | { | |
783 | struct br_ip br_group; | |
784 | ||
785 | if (ipv6_is_local_multicast(group)) | |
786 | return 0; | |
787 | ||
788 | ipv6_addr_copy(&br_group.u.ip6, group); | |
789 | br_group.proto = htons(ETH_P_IP); | |
790 | ||
791 | return br_multicast_add_group(br, port, &br_group); | |
792 | } | |
793 | #endif | |
794 | ||
eb1d1641 HX |
795 | static void br_multicast_router_expired(unsigned long data) |
796 | { | |
797 | struct net_bridge_port *port = (void *)data; | |
798 | struct net_bridge *br = port->br; | |
799 | ||
800 | spin_lock(&br->multicast_lock); | |
801 | if (port->multicast_router != 1 || | |
802 | timer_pending(&port->multicast_router_timer) || | |
803 | hlist_unhashed(&port->rlist)) | |
804 | goto out; | |
805 | ||
806 | hlist_del_init_rcu(&port->rlist); | |
807 | ||
808 | out: | |
809 | spin_unlock(&br->multicast_lock); | |
810 | } | |
811 | ||
812 | static void br_multicast_local_router_expired(unsigned long data) | |
813 | { | |
814 | } | |
815 | ||
8ef2a9a5 YH |
816 | static void __br_multicast_send_query(struct net_bridge *br, |
817 | struct net_bridge_port *port, | |
818 | struct br_ip *ip) | |
eb1d1641 | 819 | { |
eb1d1641 HX |
820 | struct sk_buff *skb; |
821 | ||
8ef2a9a5 | 822 | skb = br_multicast_alloc_query(br, ip); |
eb1d1641 | 823 | if (!skb) |
8ef2a9a5 | 824 | return; |
eb1d1641 HX |
825 | |
826 | if (port) { | |
827 | __skb_push(skb, sizeof(struct ethhdr)); | |
828 | skb->dev = port->dev; | |
713aefa3 | 829 | NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, |
eb1d1641 HX |
830 | dev_queue_xmit); |
831 | } else | |
832 | netif_rx(skb); | |
8ef2a9a5 YH |
833 | } |
834 | ||
835 | static void br_multicast_send_query(struct net_bridge *br, | |
836 | struct net_bridge_port *port, u32 sent) | |
837 | { | |
838 | unsigned long time; | |
839 | struct br_ip br_group; | |
840 | ||
841 | if (!netif_running(br->dev) || br->multicast_disabled || | |
842 | timer_pending(&br->multicast_querier_timer)) | |
843 | return; | |
844 | ||
08b202b6 YH |
845 | memset(&br_group.u, 0, sizeof(br_group.u)); |
846 | ||
8ef2a9a5 | 847 | br_group.proto = htons(ETH_P_IP); |
08b202b6 | 848 | __br_multicast_send_query(br, port, &br_group); |
8ef2a9a5 | 849 | |
08b202b6 YH |
850 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
851 | br_group.proto = htons(ETH_P_IPV6); | |
8ef2a9a5 | 852 | __br_multicast_send_query(br, port, &br_group); |
08b202b6 | 853 | #endif |
eb1d1641 | 854 | |
eb1d1641 HX |
855 | time = jiffies; |
856 | time += sent < br->multicast_startup_query_count ? | |
857 | br->multicast_startup_query_interval : | |
858 | br->multicast_query_interval; | |
859 | mod_timer(port ? &port->multicast_query_timer : | |
860 | &br->multicast_query_timer, time); | |
861 | } | |
862 | ||
863 | static void br_multicast_port_query_expired(unsigned long data) | |
864 | { | |
865 | struct net_bridge_port *port = (void *)data; | |
866 | struct net_bridge *br = port->br; | |
867 | ||
868 | spin_lock(&br->multicast_lock); | |
02a780c0 DC |
869 | if (port->state == BR_STATE_DISABLED || |
870 | port->state == BR_STATE_BLOCKING) | |
eb1d1641 HX |
871 | goto out; |
872 | ||
873 | if (port->multicast_startup_queries_sent < | |
874 | br->multicast_startup_query_count) | |
875 | port->multicast_startup_queries_sent++; | |
876 | ||
877 | br_multicast_send_query(port->br, port, | |
878 | port->multicast_startup_queries_sent); | |
879 | ||
880 | out: | |
881 | spin_unlock(&br->multicast_lock); | |
882 | } | |
883 | ||
884 | void br_multicast_add_port(struct net_bridge_port *port) | |
885 | { | |
886 | port->multicast_router = 1; | |
887 | ||
888 | setup_timer(&port->multicast_router_timer, br_multicast_router_expired, | |
889 | (unsigned long)port); | |
890 | setup_timer(&port->multicast_query_timer, | |
891 | br_multicast_port_query_expired, (unsigned long)port); | |
892 | } | |
893 | ||
894 | void br_multicast_del_port(struct net_bridge_port *port) | |
895 | { | |
896 | del_timer_sync(&port->multicast_router_timer); | |
897 | } | |
898 | ||
561f1103 HX |
899 | static void __br_multicast_enable_port(struct net_bridge_port *port) |
900 | { | |
901 | port->multicast_startup_queries_sent = 0; | |
902 | ||
903 | if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 || | |
904 | del_timer(&port->multicast_query_timer)) | |
905 | mod_timer(&port->multicast_query_timer, jiffies); | |
906 | } | |
907 | ||
eb1d1641 HX |
908 | void br_multicast_enable_port(struct net_bridge_port *port) |
909 | { | |
910 | struct net_bridge *br = port->br; | |
911 | ||
912 | spin_lock(&br->multicast_lock); | |
913 | if (br->multicast_disabled || !netif_running(br->dev)) | |
914 | goto out; | |
915 | ||
561f1103 | 916 | __br_multicast_enable_port(port); |
eb1d1641 HX |
917 | |
918 | out: | |
919 | spin_unlock(&br->multicast_lock); | |
920 | } | |
921 | ||
922 | void br_multicast_disable_port(struct net_bridge_port *port) | |
923 | { | |
924 | struct net_bridge *br = port->br; | |
925 | struct net_bridge_port_group *pg; | |
926 | struct hlist_node *p, *n; | |
927 | ||
928 | spin_lock(&br->multicast_lock); | |
929 | hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist) | |
930 | br_multicast_del_pg(br, pg); | |
931 | ||
932 | if (!hlist_unhashed(&port->rlist)) | |
933 | hlist_del_init_rcu(&port->rlist); | |
934 | del_timer(&port->multicast_router_timer); | |
935 | del_timer(&port->multicast_query_timer); | |
936 | spin_unlock(&br->multicast_lock); | |
937 | } | |
938 | ||
8ef2a9a5 YH |
939 | static int br_ip4_multicast_igmp3_report(struct net_bridge *br, |
940 | struct net_bridge_port *port, | |
941 | struct sk_buff *skb) | |
eb1d1641 HX |
942 | { |
943 | struct igmpv3_report *ih; | |
944 | struct igmpv3_grec *grec; | |
945 | int i; | |
946 | int len; | |
947 | int num; | |
948 | int type; | |
949 | int err = 0; | |
950 | __be32 group; | |
951 | ||
952 | if (!pskb_may_pull(skb, sizeof(*ih))) | |
953 | return -EINVAL; | |
954 | ||
955 | ih = igmpv3_report_hdr(skb); | |
956 | num = ntohs(ih->ngrec); | |
957 | len = sizeof(*ih); | |
958 | ||
959 | for (i = 0; i < num; i++) { | |
960 | len += sizeof(*grec); | |
961 | if (!pskb_may_pull(skb, len)) | |
962 | return -EINVAL; | |
963 | ||
fd218cf9 | 964 | grec = (void *)(skb->data + len - sizeof(*grec)); |
eb1d1641 HX |
965 | group = grec->grec_mca; |
966 | type = grec->grec_type; | |
967 | ||
8eabf95c | 968 | len += ntohs(grec->grec_nsrcs) * 4; |
eb1d1641 HX |
969 | if (!pskb_may_pull(skb, len)) |
970 | return -EINVAL; | |
971 | ||
972 | /* We treat this as an IGMPv2 report for now. */ | |
973 | switch (type) { | |
974 | case IGMPV3_MODE_IS_INCLUDE: | |
975 | case IGMPV3_MODE_IS_EXCLUDE: | |
976 | case IGMPV3_CHANGE_TO_INCLUDE: | |
977 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
978 | case IGMPV3_ALLOW_NEW_SOURCES: | |
979 | case IGMPV3_BLOCK_OLD_SOURCES: | |
980 | break; | |
981 | ||
982 | default: | |
983 | continue; | |
984 | } | |
985 | ||
8ef2a9a5 | 986 | err = br_ip4_multicast_add_group(br, port, group); |
eb1d1641 HX |
987 | if (err) |
988 | break; | |
989 | } | |
990 | ||
991 | return err; | |
992 | } | |
993 | ||
08b202b6 YH |
994 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
995 | static int br_ip6_multicast_mld2_report(struct net_bridge *br, | |
996 | struct net_bridge_port *port, | |
997 | struct sk_buff *skb) | |
998 | { | |
999 | struct icmp6hdr *icmp6h; | |
1000 | struct mld2_grec *grec; | |
1001 | int i; | |
1002 | int len; | |
1003 | int num; | |
1004 | int err = 0; | |
1005 | ||
1006 | if (!pskb_may_pull(skb, sizeof(*icmp6h))) | |
1007 | return -EINVAL; | |
1008 | ||
1009 | icmp6h = icmp6_hdr(skb); | |
1010 | num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); | |
1011 | len = sizeof(*icmp6h); | |
1012 | ||
1013 | for (i = 0; i < num; i++) { | |
1014 | __be16 *nsrcs, _nsrcs; | |
1015 | ||
1016 | nsrcs = skb_header_pointer(skb, | |
1017 | len + offsetof(struct mld2_grec, | |
1018 | grec_mca), | |
1019 | sizeof(_nsrcs), &_nsrcs); | |
1020 | if (!nsrcs) | |
1021 | return -EINVAL; | |
1022 | ||
1023 | if (!pskb_may_pull(skb, | |
1024 | len + sizeof(*grec) + | |
1025 | sizeof(struct in6_addr) * (*nsrcs))) | |
1026 | return -EINVAL; | |
1027 | ||
1028 | grec = (struct mld2_grec *)(skb->data + len); | |
1029 | len += sizeof(*grec) + sizeof(struct in6_addr) * (*nsrcs); | |
1030 | ||
1031 | /* We treat these as MLDv1 reports for now. */ | |
1032 | switch (grec->grec_type) { | |
1033 | case MLD2_MODE_IS_INCLUDE: | |
1034 | case MLD2_MODE_IS_EXCLUDE: | |
1035 | case MLD2_CHANGE_TO_INCLUDE: | |
1036 | case MLD2_CHANGE_TO_EXCLUDE: | |
1037 | case MLD2_ALLOW_NEW_SOURCES: | |
1038 | case MLD2_BLOCK_OLD_SOURCES: | |
1039 | break; | |
1040 | ||
1041 | default: | |
1042 | continue; | |
1043 | } | |
1044 | ||
1045 | err = br_ip6_multicast_add_group(br, port, &grec->grec_mca); | |
1046 | if (!err) | |
1047 | break; | |
1048 | } | |
1049 | ||
1050 | return err; | |
1051 | } | |
1052 | #endif | |
1053 | ||
7e80c124 | 1054 | /* |
1055 | * Add port to rotuer_list | |
1056 | * list is maintained ordered by pointer value | |
1057 | * and locked by br->multicast_lock and RCU | |
1058 | */ | |
0909e117 HX |
1059 | static void br_multicast_add_router(struct net_bridge *br, |
1060 | struct net_bridge_port *port) | |
1061 | { | |
dcdca2c4 | 1062 | struct net_bridge_port *p; |
7e80c124 | 1063 | struct hlist_node *n, *slot = NULL; |
dcdca2c4 | 1064 | |
709b9326 | 1065 | hlist_for_each_entry(p, n, &br->router_list, rlist) { |
7e80c124 | 1066 | if ((unsigned long) port >= (unsigned long) p) |
1067 | break; | |
1068 | slot = n; | |
dcdca2c4 | 1069 | } |
1070 | ||
7e80c124 | 1071 | if (slot) |
1072 | hlist_add_after_rcu(slot, &port->rlist); | |
dcdca2c4 | 1073 | else |
1074 | hlist_add_head_rcu(&port->rlist, &br->router_list); | |
0909e117 HX |
1075 | } |
1076 | ||
eb1d1641 HX |
1077 | static void br_multicast_mark_router(struct net_bridge *br, |
1078 | struct net_bridge_port *port) | |
1079 | { | |
1080 | unsigned long now = jiffies; | |
eb1d1641 HX |
1081 | |
1082 | if (!port) { | |
1083 | if (br->multicast_router == 1) | |
1084 | mod_timer(&br->multicast_router_timer, | |
1085 | now + br->multicast_querier_interval); | |
1086 | return; | |
1087 | } | |
1088 | ||
1089 | if (port->multicast_router != 1) | |
1090 | return; | |
1091 | ||
1092 | if (!hlist_unhashed(&port->rlist)) | |
1093 | goto timer; | |
1094 | ||
0909e117 | 1095 | br_multicast_add_router(br, port); |
eb1d1641 HX |
1096 | |
1097 | timer: | |
1098 | mod_timer(&port->multicast_router_timer, | |
1099 | now + br->multicast_querier_interval); | |
1100 | } | |
1101 | ||
1102 | static void br_multicast_query_received(struct net_bridge *br, | |
1103 | struct net_bridge_port *port, | |
8ef2a9a5 | 1104 | int saddr) |
eb1d1641 HX |
1105 | { |
1106 | if (saddr) | |
1107 | mod_timer(&br->multicast_querier_timer, | |
1108 | jiffies + br->multicast_querier_interval); | |
1109 | else if (timer_pending(&br->multicast_querier_timer)) | |
1110 | return; | |
1111 | ||
1112 | br_multicast_mark_router(br, port); | |
1113 | } | |
1114 | ||
8ef2a9a5 YH |
1115 | static int br_ip4_multicast_query(struct net_bridge *br, |
1116 | struct net_bridge_port *port, | |
1117 | struct sk_buff *skb) | |
eb1d1641 HX |
1118 | { |
1119 | struct iphdr *iph = ip_hdr(skb); | |
1120 | struct igmphdr *ih = igmp_hdr(skb); | |
1121 | struct net_bridge_mdb_entry *mp; | |
1122 | struct igmpv3_query *ih3; | |
1123 | struct net_bridge_port_group *p; | |
e8051688 | 1124 | struct net_bridge_port_group __rcu **pp; |
eb1d1641 HX |
1125 | unsigned long max_delay; |
1126 | unsigned long now = jiffies; | |
1127 | __be32 group; | |
bec68ff1 | 1128 | int err = 0; |
eb1d1641 HX |
1129 | |
1130 | spin_lock(&br->multicast_lock); | |
1131 | if (!netif_running(br->dev) || | |
1132 | (port && port->state == BR_STATE_DISABLED)) | |
1133 | goto out; | |
1134 | ||
8ef2a9a5 | 1135 | br_multicast_query_received(br, port, !!iph->saddr); |
eb1d1641 HX |
1136 | |
1137 | group = ih->group; | |
1138 | ||
1139 | if (skb->len == sizeof(*ih)) { | |
1140 | max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); | |
1141 | ||
1142 | if (!max_delay) { | |
1143 | max_delay = 10 * HZ; | |
1144 | group = 0; | |
1145 | } | |
1146 | } else { | |
bec68ff1 YH |
1147 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) { |
1148 | err = -EINVAL; | |
1149 | goto out; | |
1150 | } | |
eb1d1641 HX |
1151 | |
1152 | ih3 = igmpv3_query_hdr(skb); | |
1153 | if (ih3->nsrcs) | |
bec68ff1 | 1154 | goto out; |
eb1d1641 | 1155 | |
0ba8c9ec YH |
1156 | max_delay = ih3->code ? |
1157 | IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; | |
eb1d1641 HX |
1158 | } |
1159 | ||
1160 | if (!group) | |
1161 | goto out; | |
1162 | ||
e8051688 | 1163 | mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group); |
eb1d1641 HX |
1164 | if (!mp) |
1165 | goto out; | |
1166 | ||
1167 | max_delay *= br->multicast_last_member_count; | |
1168 | ||
1169 | if (!hlist_unhashed(&mp->mglist) && | |
1170 | (timer_pending(&mp->timer) ? | |
1171 | time_after(mp->timer.expires, now + max_delay) : | |
1172 | try_to_del_timer_sync(&mp->timer) >= 0)) | |
1173 | mod_timer(&mp->timer, now + max_delay); | |
1174 | ||
e8051688 ED |
1175 | for (pp = &mp->ports; |
1176 | (p = mlock_dereference(*pp, br)) != NULL; | |
1177 | pp = &p->next) { | |
eb1d1641 HX |
1178 | if (timer_pending(&p->timer) ? |
1179 | time_after(p->timer.expires, now + max_delay) : | |
1180 | try_to_del_timer_sync(&p->timer) >= 0) | |
24f9cdcb | 1181 | mod_timer(&p->timer, now + max_delay); |
eb1d1641 HX |
1182 | } |
1183 | ||
1184 | out: | |
1185 | spin_unlock(&br->multicast_lock); | |
bec68ff1 | 1186 | return err; |
eb1d1641 HX |
1187 | } |
1188 | ||
08b202b6 YH |
1189 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
1190 | static int br_ip6_multicast_query(struct net_bridge *br, | |
1191 | struct net_bridge_port *port, | |
1192 | struct sk_buff *skb) | |
1193 | { | |
1194 | struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
1195 | struct mld_msg *mld = (struct mld_msg *) icmp6_hdr(skb); | |
1196 | struct net_bridge_mdb_entry *mp; | |
1197 | struct mld2_query *mld2q; | |
e8051688 ED |
1198 | struct net_bridge_port_group *p; |
1199 | struct net_bridge_port_group __rcu **pp; | |
08b202b6 YH |
1200 | unsigned long max_delay; |
1201 | unsigned long now = jiffies; | |
1202 | struct in6_addr *group = NULL; | |
1203 | int err = 0; | |
1204 | ||
1205 | spin_lock(&br->multicast_lock); | |
1206 | if (!netif_running(br->dev) || | |
1207 | (port && port->state == BR_STATE_DISABLED)) | |
1208 | goto out; | |
1209 | ||
1210 | br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr)); | |
1211 | ||
1212 | if (skb->len == sizeof(*mld)) { | |
1213 | if (!pskb_may_pull(skb, sizeof(*mld))) { | |
1214 | err = -EINVAL; | |
1215 | goto out; | |
1216 | } | |
1217 | mld = (struct mld_msg *) icmp6_hdr(skb); | |
1218 | max_delay = msecs_to_jiffies(htons(mld->mld_maxdelay)); | |
1219 | if (max_delay) | |
1220 | group = &mld->mld_mca; | |
1221 | } else if (skb->len >= sizeof(*mld2q)) { | |
1222 | if (!pskb_may_pull(skb, sizeof(*mld2q))) { | |
1223 | err = -EINVAL; | |
1224 | goto out; | |
1225 | } | |
1226 | mld2q = (struct mld2_query *)icmp6_hdr(skb); | |
1227 | if (!mld2q->mld2q_nsrcs) | |
1228 | group = &mld2q->mld2q_mca; | |
1229 | max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(mld2q->mld2q_mrc) : 1; | |
1230 | } | |
1231 | ||
1232 | if (!group) | |
1233 | goto out; | |
1234 | ||
e8051688 | 1235 | mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group); |
08b202b6 YH |
1236 | if (!mp) |
1237 | goto out; | |
1238 | ||
1239 | max_delay *= br->multicast_last_member_count; | |
1240 | if (!hlist_unhashed(&mp->mglist) && | |
1241 | (timer_pending(&mp->timer) ? | |
1242 | time_after(mp->timer.expires, now + max_delay) : | |
1243 | try_to_del_timer_sync(&mp->timer) >= 0)) | |
1244 | mod_timer(&mp->timer, now + max_delay); | |
1245 | ||
e8051688 ED |
1246 | for (pp = &mp->ports; |
1247 | (p = mlock_dereference(*pp, br)) != NULL; | |
1248 | pp = &p->next) { | |
08b202b6 YH |
1249 | if (timer_pending(&p->timer) ? |
1250 | time_after(p->timer.expires, now + max_delay) : | |
1251 | try_to_del_timer_sync(&p->timer) >= 0) | |
24f9cdcb | 1252 | mod_timer(&p->timer, now + max_delay); |
08b202b6 YH |
1253 | } |
1254 | ||
1255 | out: | |
1256 | spin_unlock(&br->multicast_lock); | |
1257 | return err; | |
1258 | } | |
1259 | #endif | |
1260 | ||
eb1d1641 HX |
1261 | static void br_multicast_leave_group(struct net_bridge *br, |
1262 | struct net_bridge_port *port, | |
8ef2a9a5 | 1263 | struct br_ip *group) |
eb1d1641 HX |
1264 | { |
1265 | struct net_bridge_mdb_htable *mdb; | |
1266 | struct net_bridge_mdb_entry *mp; | |
1267 | struct net_bridge_port_group *p; | |
1268 | unsigned long now; | |
1269 | unsigned long time; | |
1270 | ||
eb1d1641 HX |
1271 | spin_lock(&br->multicast_lock); |
1272 | if (!netif_running(br->dev) || | |
1273 | (port && port->state == BR_STATE_DISABLED) || | |
1274 | timer_pending(&br->multicast_querier_timer)) | |
1275 | goto out; | |
1276 | ||
e8051688 | 1277 | mdb = mlock_dereference(br->mdb, br); |
eb1d1641 HX |
1278 | mp = br_mdb_ip_get(mdb, group); |
1279 | if (!mp) | |
1280 | goto out; | |
1281 | ||
1282 | now = jiffies; | |
1283 | time = now + br->multicast_last_member_count * | |
1284 | br->multicast_last_member_interval; | |
1285 | ||
1286 | if (!port) { | |
1287 | if (!hlist_unhashed(&mp->mglist) && | |
1288 | (timer_pending(&mp->timer) ? | |
1289 | time_after(mp->timer.expires, time) : | |
1290 | try_to_del_timer_sync(&mp->timer) >= 0)) { | |
1291 | mod_timer(&mp->timer, time); | |
1292 | ||
1293 | mp->queries_sent = 0; | |
1294 | mod_timer(&mp->query_timer, now); | |
1295 | } | |
1296 | ||
1297 | goto out; | |
1298 | } | |
1299 | ||
e8051688 ED |
1300 | for (p = mlock_dereference(mp->ports, br); |
1301 | p != NULL; | |
1302 | p = mlock_dereference(p->next, br)) { | |
eb1d1641 HX |
1303 | if (p->port != port) |
1304 | continue; | |
1305 | ||
1306 | if (!hlist_unhashed(&p->mglist) && | |
1307 | (timer_pending(&p->timer) ? | |
1308 | time_after(p->timer.expires, time) : | |
1309 | try_to_del_timer_sync(&p->timer) >= 0)) { | |
1310 | mod_timer(&p->timer, time); | |
1311 | ||
1312 | p->queries_sent = 0; | |
1313 | mod_timer(&p->query_timer, now); | |
1314 | } | |
1315 | ||
1316 | break; | |
1317 | } | |
1318 | ||
1319 | out: | |
1320 | spin_unlock(&br->multicast_lock); | |
1321 | } | |
1322 | ||
8ef2a9a5 YH |
1323 | static void br_ip4_multicast_leave_group(struct net_bridge *br, |
1324 | struct net_bridge_port *port, | |
1325 | __be32 group) | |
1326 | { | |
1327 | struct br_ip br_group; | |
1328 | ||
1329 | if (ipv4_is_local_multicast(group)) | |
1330 | return; | |
1331 | ||
1332 | br_group.u.ip4 = group; | |
1333 | br_group.proto = htons(ETH_P_IP); | |
1334 | ||
1335 | br_multicast_leave_group(br, port, &br_group); | |
1336 | } | |
1337 | ||
08b202b6 YH |
1338 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
1339 | static void br_ip6_multicast_leave_group(struct net_bridge *br, | |
1340 | struct net_bridge_port *port, | |
1341 | const struct in6_addr *group) | |
1342 | { | |
1343 | struct br_ip br_group; | |
1344 | ||
1345 | if (ipv6_is_local_multicast(group)) | |
1346 | return; | |
1347 | ||
1348 | ipv6_addr_copy(&br_group.u.ip6, group); | |
1349 | br_group.proto = htons(ETH_P_IPV6); | |
1350 | ||
1351 | br_multicast_leave_group(br, port, &br_group); | |
1352 | } | |
1353 | #endif | |
8ef2a9a5 | 1354 | |
eb1d1641 HX |
1355 | static int br_multicast_ipv4_rcv(struct net_bridge *br, |
1356 | struct net_bridge_port *port, | |
1357 | struct sk_buff *skb) | |
1358 | { | |
1359 | struct sk_buff *skb2 = skb; | |
1360 | struct iphdr *iph; | |
1361 | struct igmphdr *ih; | |
1362 | unsigned len; | |
1363 | unsigned offset; | |
1364 | int err; | |
1365 | ||
eb1d1641 HX |
1366 | /* We treat OOM as packet loss for now. */ |
1367 | if (!pskb_may_pull(skb, sizeof(*iph))) | |
1368 | return -EINVAL; | |
1369 | ||
1370 | iph = ip_hdr(skb); | |
1371 | ||
1372 | if (iph->ihl < 5 || iph->version != 4) | |
1373 | return -EINVAL; | |
1374 | ||
1375 | if (!pskb_may_pull(skb, ip_hdrlen(skb))) | |
1376 | return -EINVAL; | |
1377 | ||
1378 | iph = ip_hdr(skb); | |
1379 | ||
1380 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
1381 | return -EINVAL; | |
1382 | ||
1383 | if (iph->protocol != IPPROTO_IGMP) | |
1384 | return 0; | |
1385 | ||
1386 | len = ntohs(iph->tot_len); | |
1387 | if (skb->len < len || len < ip_hdrlen(skb)) | |
1388 | return -EINVAL; | |
1389 | ||
1390 | if (skb->len > len) { | |
1391 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1392 | if (!skb2) | |
1393 | return -ENOMEM; | |
1394 | ||
1395 | err = pskb_trim_rcsum(skb2, len); | |
1396 | if (err) | |
8440853b | 1397 | goto err_out; |
eb1d1641 HX |
1398 | } |
1399 | ||
1400 | len -= ip_hdrlen(skb2); | |
1401 | offset = skb_network_offset(skb2) + ip_hdrlen(skb2); | |
1402 | __skb_pull(skb2, offset); | |
1403 | skb_reset_transport_header(skb2); | |
1404 | ||
1405 | err = -EINVAL; | |
1406 | if (!pskb_may_pull(skb2, sizeof(*ih))) | |
1407 | goto out; | |
1408 | ||
eb1d1641 HX |
1409 | switch (skb2->ip_summed) { |
1410 | case CHECKSUM_COMPLETE: | |
1411 | if (!csum_fold(skb2->csum)) | |
1412 | break; | |
1413 | /* fall through */ | |
1414 | case CHECKSUM_NONE: | |
1415 | skb2->csum = 0; | |
1416 | if (skb_checksum_complete(skb2)) | |
8440853b | 1417 | goto out; |
eb1d1641 HX |
1418 | } |
1419 | ||
1420 | err = 0; | |
1421 | ||
1422 | BR_INPUT_SKB_CB(skb)->igmp = 1; | |
1423 | ih = igmp_hdr(skb2); | |
1424 | ||
1425 | switch (ih->type) { | |
1426 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1427 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1428 | BR_INPUT_SKB_CB(skb2)->mrouters_only = 1; | |
8ef2a9a5 | 1429 | err = br_ip4_multicast_add_group(br, port, ih->group); |
eb1d1641 HX |
1430 | break; |
1431 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
8ef2a9a5 | 1432 | err = br_ip4_multicast_igmp3_report(br, port, skb2); |
eb1d1641 HX |
1433 | break; |
1434 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
8ef2a9a5 | 1435 | err = br_ip4_multicast_query(br, port, skb2); |
eb1d1641 HX |
1436 | break; |
1437 | case IGMP_HOST_LEAVE_MESSAGE: | |
8ef2a9a5 | 1438 | br_ip4_multicast_leave_group(br, port, ih->group); |
eb1d1641 HX |
1439 | break; |
1440 | } | |
1441 | ||
1442 | out: | |
1443 | __skb_push(skb2, offset); | |
8440853b | 1444 | err_out: |
eb1d1641 HX |
1445 | if (skb2 != skb) |
1446 | kfree_skb(skb2); | |
1447 | return err; | |
1448 | } | |
1449 | ||
08b202b6 YH |
1450 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
1451 | static int br_multicast_ipv6_rcv(struct net_bridge *br, | |
1452 | struct net_bridge_port *port, | |
1453 | struct sk_buff *skb) | |
1454 | { | |
9d89081d | 1455 | struct sk_buff *skb2; |
08b202b6 YH |
1456 | struct ipv6hdr *ip6h; |
1457 | struct icmp6hdr *icmp6h; | |
1458 | u8 nexthdr; | |
1459 | unsigned len; | |
bb7a0bd6 | 1460 | int offset; |
08b202b6 YH |
1461 | int err; |
1462 | ||
08b202b6 YH |
1463 | if (!pskb_may_pull(skb, sizeof(*ip6h))) |
1464 | return -EINVAL; | |
1465 | ||
1466 | ip6h = ipv6_hdr(skb); | |
1467 | ||
1468 | /* | |
1469 | * We're interested in MLD messages only. | |
1470 | * - Version is 6 | |
1471 | * - MLD has always Router Alert hop-by-hop option | |
1472 | * - But we do not support jumbrograms. | |
1473 | */ | |
1474 | if (ip6h->version != 6 || | |
1475 | ip6h->nexthdr != IPPROTO_HOPOPTS || | |
1476 | ip6h->payload_len == 0) | |
1477 | return 0; | |
1478 | ||
1479 | len = ntohs(ip6h->payload_len); | |
1480 | if (skb->len < len) | |
1481 | return -EINVAL; | |
1482 | ||
1483 | nexthdr = ip6h->nexthdr; | |
1484 | offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr); | |
1485 | ||
1486 | if (offset < 0 || nexthdr != IPPROTO_ICMPV6) | |
1487 | return 0; | |
1488 | ||
1489 | /* Okay, we found ICMPv6 header */ | |
1490 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1491 | if (!skb2) | |
1492 | return -ENOMEM; | |
1493 | ||
9d89081d TW |
1494 | err = -EINVAL; |
1495 | if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr))) | |
1496 | goto out; | |
1497 | ||
08b202b6 YH |
1498 | len -= offset - skb_network_offset(skb2); |
1499 | ||
1500 | __skb_pull(skb2, offset); | |
1501 | skb_reset_transport_header(skb2); | |
1502 | ||
08b202b6 YH |
1503 | icmp6h = icmp6_hdr(skb2); |
1504 | ||
1505 | switch (icmp6h->icmp6_type) { | |
1506 | case ICMPV6_MGM_QUERY: | |
1507 | case ICMPV6_MGM_REPORT: | |
1508 | case ICMPV6_MGM_REDUCTION: | |
1509 | case ICMPV6_MLD2_REPORT: | |
1510 | break; | |
1511 | default: | |
1512 | err = 0; | |
1513 | goto out; | |
1514 | } | |
1515 | ||
1516 | /* Okay, we found MLD message. Check further. */ | |
1517 | if (skb2->len > len) { | |
1518 | err = pskb_trim_rcsum(skb2, len); | |
1519 | if (err) | |
1520 | goto out; | |
1521 | } | |
1522 | ||
1523 | switch (skb2->ip_summed) { | |
1524 | case CHECKSUM_COMPLETE: | |
1525 | if (!csum_fold(skb2->csum)) | |
1526 | break; | |
1527 | /*FALLTHROUGH*/ | |
1528 | case CHECKSUM_NONE: | |
1529 | skb2->csum = 0; | |
1530 | if (skb_checksum_complete(skb2)) | |
1531 | goto out; | |
1532 | } | |
1533 | ||
1534 | err = 0; | |
1535 | ||
1536 | BR_INPUT_SKB_CB(skb)->igmp = 1; | |
1537 | ||
1538 | switch (icmp6h->icmp6_type) { | |
1539 | case ICMPV6_MGM_REPORT: | |
1540 | { | |
9d89081d TW |
1541 | struct mld_msg *mld; |
1542 | if (!pskb_may_pull(skb2, sizeof(*mld))) { | |
1543 | err = -EINVAL; | |
1544 | goto out; | |
1545 | } | |
1546 | mld = (struct mld_msg *)skb_transport_header(skb2); | |
08b202b6 YH |
1547 | BR_INPUT_SKB_CB(skb2)->mrouters_only = 1; |
1548 | err = br_ip6_multicast_add_group(br, port, &mld->mld_mca); | |
1549 | break; | |
1550 | } | |
1551 | case ICMPV6_MLD2_REPORT: | |
1552 | err = br_ip6_multicast_mld2_report(br, port, skb2); | |
1553 | break; | |
1554 | case ICMPV6_MGM_QUERY: | |
1555 | err = br_ip6_multicast_query(br, port, skb2); | |
1556 | break; | |
1557 | case ICMPV6_MGM_REDUCTION: | |
1558 | { | |
9d89081d TW |
1559 | struct mld_msg *mld; |
1560 | if (!pskb_may_pull(skb2, sizeof(*mld))) { | |
1561 | err = -EINVAL; | |
1562 | goto out; | |
1563 | } | |
1564 | mld = (struct mld_msg *)skb_transport_header(skb2); | |
08b202b6 YH |
1565 | br_ip6_multicast_leave_group(br, port, &mld->mld_mca); |
1566 | } | |
1567 | } | |
1568 | ||
1569 | out: | |
9d89081d | 1570 | kfree_skb(skb2); |
08b202b6 YH |
1571 | return err; |
1572 | } | |
1573 | #endif | |
1574 | ||
eb1d1641 HX |
1575 | int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, |
1576 | struct sk_buff *skb) | |
1577 | { | |
1fafc7a9 YH |
1578 | BR_INPUT_SKB_CB(skb)->igmp = 0; |
1579 | BR_INPUT_SKB_CB(skb)->mrouters_only = 0; | |
1580 | ||
eb1d1641 HX |
1581 | if (br->multicast_disabled) |
1582 | return 0; | |
1583 | ||
1584 | switch (skb->protocol) { | |
1585 | case htons(ETH_P_IP): | |
1586 | return br_multicast_ipv4_rcv(br, port, skb); | |
08b202b6 YH |
1587 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
1588 | case htons(ETH_P_IPV6): | |
1589 | return br_multicast_ipv6_rcv(br, port, skb); | |
1590 | #endif | |
eb1d1641 HX |
1591 | } |
1592 | ||
1593 | return 0; | |
1594 | } | |
1595 | ||
1596 | static void br_multicast_query_expired(unsigned long data) | |
1597 | { | |
1598 | struct net_bridge *br = (void *)data; | |
1599 | ||
1600 | spin_lock(&br->multicast_lock); | |
1601 | if (br->multicast_startup_queries_sent < | |
1602 | br->multicast_startup_query_count) | |
1603 | br->multicast_startup_queries_sent++; | |
1604 | ||
1605 | br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent); | |
1606 | ||
1607 | spin_unlock(&br->multicast_lock); | |
1608 | } | |
1609 | ||
1610 | void br_multicast_init(struct net_bridge *br) | |
1611 | { | |
1612 | br->hash_elasticity = 4; | |
1613 | br->hash_max = 512; | |
1614 | ||
1615 | br->multicast_router = 1; | |
1616 | br->multicast_last_member_count = 2; | |
1617 | br->multicast_startup_query_count = 2; | |
1618 | ||
1619 | br->multicast_last_member_interval = HZ; | |
1620 | br->multicast_query_response_interval = 10 * HZ; | |
1621 | br->multicast_startup_query_interval = 125 * HZ / 4; | |
1622 | br->multicast_query_interval = 125 * HZ; | |
1623 | br->multicast_querier_interval = 255 * HZ; | |
1624 | br->multicast_membership_interval = 260 * HZ; | |
1625 | ||
1626 | spin_lock_init(&br->multicast_lock); | |
1627 | setup_timer(&br->multicast_router_timer, | |
1628 | br_multicast_local_router_expired, 0); | |
1629 | setup_timer(&br->multicast_querier_timer, | |
1630 | br_multicast_local_router_expired, 0); | |
1631 | setup_timer(&br->multicast_query_timer, br_multicast_query_expired, | |
1632 | (unsigned long)br); | |
1633 | } | |
1634 | ||
1635 | void br_multicast_open(struct net_bridge *br) | |
1636 | { | |
1637 | br->multicast_startup_queries_sent = 0; | |
1638 | ||
1639 | if (br->multicast_disabled) | |
1640 | return; | |
1641 | ||
1642 | mod_timer(&br->multicast_query_timer, jiffies); | |
1643 | } | |
1644 | ||
1645 | void br_multicast_stop(struct net_bridge *br) | |
1646 | { | |
1647 | struct net_bridge_mdb_htable *mdb; | |
1648 | struct net_bridge_mdb_entry *mp; | |
1649 | struct hlist_node *p, *n; | |
1650 | u32 ver; | |
1651 | int i; | |
1652 | ||
1653 | del_timer_sync(&br->multicast_router_timer); | |
1654 | del_timer_sync(&br->multicast_querier_timer); | |
1655 | del_timer_sync(&br->multicast_query_timer); | |
1656 | ||
1657 | spin_lock_bh(&br->multicast_lock); | |
e8051688 | 1658 | mdb = mlock_dereference(br->mdb, br); |
eb1d1641 HX |
1659 | if (!mdb) |
1660 | goto out; | |
1661 | ||
1662 | br->mdb = NULL; | |
1663 | ||
1664 | ver = mdb->ver; | |
1665 | for (i = 0; i < mdb->max; i++) { | |
1666 | hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i], | |
1667 | hlist[ver]) { | |
1668 | del_timer(&mp->timer); | |
1669 | del_timer(&mp->query_timer); | |
1670 | call_rcu_bh(&mp->rcu, br_multicast_free_group); | |
1671 | } | |
1672 | } | |
1673 | ||
1674 | if (mdb->old) { | |
1675 | spin_unlock_bh(&br->multicast_lock); | |
10cc2b50 | 1676 | rcu_barrier_bh(); |
eb1d1641 HX |
1677 | spin_lock_bh(&br->multicast_lock); |
1678 | WARN_ON(mdb->old); | |
1679 | } | |
1680 | ||
1681 | mdb->old = mdb; | |
1682 | call_rcu_bh(&mdb->rcu, br_mdb_free); | |
1683 | ||
1684 | out: | |
1685 | spin_unlock_bh(&br->multicast_lock); | |
1686 | } | |
0909e117 HX |
1687 | |
1688 | int br_multicast_set_router(struct net_bridge *br, unsigned long val) | |
1689 | { | |
1690 | int err = -ENOENT; | |
1691 | ||
1692 | spin_lock_bh(&br->multicast_lock); | |
1693 | if (!netif_running(br->dev)) | |
1694 | goto unlock; | |
1695 | ||
1696 | switch (val) { | |
1697 | case 0: | |
1698 | case 2: | |
1699 | del_timer(&br->multicast_router_timer); | |
1700 | /* fall through */ | |
1701 | case 1: | |
1702 | br->multicast_router = val; | |
1703 | err = 0; | |
1704 | break; | |
1705 | ||
1706 | default: | |
1707 | err = -EINVAL; | |
1708 | break; | |
1709 | } | |
1710 | ||
1711 | unlock: | |
1712 | spin_unlock_bh(&br->multicast_lock); | |
1713 | ||
1714 | return err; | |
1715 | } | |
1716 | ||
1717 | int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) | |
1718 | { | |
1719 | struct net_bridge *br = p->br; | |
1720 | int err = -ENOENT; | |
1721 | ||
1722 | spin_lock(&br->multicast_lock); | |
1723 | if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED) | |
1724 | goto unlock; | |
1725 | ||
1726 | switch (val) { | |
1727 | case 0: | |
1728 | case 1: | |
1729 | case 2: | |
1730 | p->multicast_router = val; | |
1731 | err = 0; | |
1732 | ||
1733 | if (val < 2 && !hlist_unhashed(&p->rlist)) | |
1734 | hlist_del_init_rcu(&p->rlist); | |
1735 | ||
1736 | if (val == 1) | |
1737 | break; | |
1738 | ||
1739 | del_timer(&p->multicast_router_timer); | |
1740 | ||
1741 | if (val == 0) | |
1742 | break; | |
1743 | ||
1744 | br_multicast_add_router(br, p); | |
1745 | break; | |
1746 | ||
1747 | default: | |
1748 | err = -EINVAL; | |
1749 | break; | |
1750 | } | |
1751 | ||
1752 | unlock: | |
1753 | spin_unlock(&br->multicast_lock); | |
1754 | ||
1755 | return err; | |
1756 | } | |
561f1103 HX |
1757 | |
1758 | int br_multicast_toggle(struct net_bridge *br, unsigned long val) | |
1759 | { | |
1760 | struct net_bridge_port *port; | |
3a7fda06 | 1761 | int err = 0; |
e8051688 | 1762 | struct net_bridge_mdb_htable *mdb; |
561f1103 HX |
1763 | |
1764 | spin_lock(&br->multicast_lock); | |
561f1103 HX |
1765 | if (br->multicast_disabled == !val) |
1766 | goto unlock; | |
1767 | ||
1768 | br->multicast_disabled = !val; | |
1769 | if (br->multicast_disabled) | |
1770 | goto unlock; | |
1771 | ||
3a7fda06 HX |
1772 | if (!netif_running(br->dev)) |
1773 | goto unlock; | |
1774 | ||
e8051688 ED |
1775 | mdb = mlock_dereference(br->mdb, br); |
1776 | if (mdb) { | |
1777 | if (mdb->old) { | |
561f1103 HX |
1778 | err = -EEXIST; |
1779 | rollback: | |
1780 | br->multicast_disabled = !!val; | |
1781 | goto unlock; | |
1782 | } | |
1783 | ||
e8051688 | 1784 | err = br_mdb_rehash(&br->mdb, mdb->max, |
561f1103 HX |
1785 | br->hash_elasticity); |
1786 | if (err) | |
1787 | goto rollback; | |
1788 | } | |
1789 | ||
1790 | br_multicast_open(br); | |
1791 | list_for_each_entry(port, &br->port_list, list) { | |
1792 | if (port->state == BR_STATE_DISABLED || | |
1793 | port->state == BR_STATE_BLOCKING) | |
1794 | continue; | |
1795 | ||
1796 | __br_multicast_enable_port(port); | |
1797 | } | |
1798 | ||
1799 | unlock: | |
1800 | spin_unlock(&br->multicast_lock); | |
1801 | ||
1802 | return err; | |
1803 | } | |
b195167f HX |
1804 | |
1805 | int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) | |
1806 | { | |
1807 | int err = -ENOENT; | |
1808 | u32 old; | |
e8051688 | 1809 | struct net_bridge_mdb_htable *mdb; |
b195167f HX |
1810 | |
1811 | spin_lock(&br->multicast_lock); | |
1812 | if (!netif_running(br->dev)) | |
1813 | goto unlock; | |
1814 | ||
1815 | err = -EINVAL; | |
1816 | if (!is_power_of_2(val)) | |
1817 | goto unlock; | |
e8051688 ED |
1818 | |
1819 | mdb = mlock_dereference(br->mdb, br); | |
1820 | if (mdb && val < mdb->size) | |
b195167f HX |
1821 | goto unlock; |
1822 | ||
1823 | err = 0; | |
1824 | ||
1825 | old = br->hash_max; | |
1826 | br->hash_max = val; | |
1827 | ||
e8051688 ED |
1828 | if (mdb) { |
1829 | if (mdb->old) { | |
b195167f HX |
1830 | err = -EEXIST; |
1831 | rollback: | |
1832 | br->hash_max = old; | |
1833 | goto unlock; | |
1834 | } | |
1835 | ||
1836 | err = br_mdb_rehash(&br->mdb, br->hash_max, | |
1837 | br->hash_elasticity); | |
1838 | if (err) | |
1839 | goto rollback; | |
1840 | } | |
1841 | ||
1842 | unlock: | |
1843 | spin_unlock(&br->multicast_lock); | |
1844 | ||
1845 | return err; | |
1846 | } |