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> | |
dfd56b8b | 27 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
28 | #include <net/ipv6.h> |
29 | #include <net/mld.h> | |
30 | #include <net/addrconf.h> | |
d4c4f07d | 31 | #include <net/ip6_checksum.h> |
08b202b6 | 32 | #endif |
eb1d1641 HX |
33 | |
34 | #include "br_private.h" | |
35 | ||
e8051688 ED |
36 | #define mlock_dereference(X, br) \ |
37 | rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) | |
38 | ||
c83b8fab HX |
39 | static void br_multicast_start_querier(struct net_bridge *br); |
40 | ||
dfd56b8b | 41 | #if IS_ENABLED(CONFIG_IPV6) |
e4de9f9e | 42 | static inline int ipv6_is_transient_multicast(const struct in6_addr *addr) |
eb1d1641 | 43 | { |
e4de9f9e | 44 | if (ipv6_addr_is_multicast(addr) && IPV6_ADDR_MC_FLAG_TRANSIENT(addr)) |
08b202b6 YH |
45 | return 1; |
46 | return 0; | |
47 | } | |
48 | #endif | |
49 | ||
8ef2a9a5 YH |
50 | static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b) |
51 | { | |
52 | if (a->proto != b->proto) | |
53 | return 0; | |
54 | switch (a->proto) { | |
55 | case htons(ETH_P_IP): | |
56 | return a->u.ip4 == b->u.ip4; | |
dfd56b8b | 57 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
58 | case htons(ETH_P_IPV6): |
59 | return ipv6_addr_equal(&a->u.ip6, &b->u.ip6); | |
60 | #endif | |
8ef2a9a5 YH |
61 | } |
62 | return 0; | |
63 | } | |
64 | ||
65 | static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip) | |
eb1d1641 | 66 | { |
0eae88f3 | 67 | return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1); |
eb1d1641 HX |
68 | } |
69 | ||
dfd56b8b | 70 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
71 | static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb, |
72 | const struct in6_addr *ip) | |
73 | { | |
74 | return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1); | |
75 | } | |
76 | #endif | |
77 | ||
8ef2a9a5 YH |
78 | static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb, |
79 | struct br_ip *ip) | |
80 | { | |
81 | switch (ip->proto) { | |
82 | case htons(ETH_P_IP): | |
83 | return __br_ip4_hash(mdb, ip->u.ip4); | |
dfd56b8b | 84 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
85 | case htons(ETH_P_IPV6): |
86 | return __br_ip6_hash(mdb, &ip->u.ip6); | |
87 | #endif | |
8ef2a9a5 YH |
88 | } |
89 | return 0; | |
eb1d1641 HX |
90 | } |
91 | ||
92 | static struct net_bridge_mdb_entry *__br_mdb_ip_get( | |
8ef2a9a5 | 93 | struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash) |
eb1d1641 HX |
94 | { |
95 | struct net_bridge_mdb_entry *mp; | |
96 | struct hlist_node *p; | |
97 | ||
49f5fcfd | 98 | hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) { |
8ef2a9a5 | 99 | if (br_ip_equal(&mp->addr, dst)) |
eb1d1641 HX |
100 | return mp; |
101 | } | |
102 | ||
103 | return NULL; | |
104 | } | |
105 | ||
7f285fa7 HX |
106 | static struct net_bridge_mdb_entry *br_mdb_ip_get( |
107 | struct net_bridge_mdb_htable *mdb, struct br_ip *dst) | |
108 | { | |
109 | if (!mdb) | |
110 | return NULL; | |
111 | ||
112 | return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst)); | |
113 | } | |
114 | ||
8ef2a9a5 | 115 | static struct net_bridge_mdb_entry *br_mdb_ip4_get( |
eb1d1641 HX |
116 | struct net_bridge_mdb_htable *mdb, __be32 dst) |
117 | { | |
8ef2a9a5 YH |
118 | struct br_ip br_dst; |
119 | ||
120 | br_dst.u.ip4 = dst; | |
121 | br_dst.proto = htons(ETH_P_IP); | |
0821ec55 | 122 | |
7f285fa7 | 123 | return br_mdb_ip_get(mdb, &br_dst); |
8ef2a9a5 YH |
124 | } |
125 | ||
dfd56b8b | 126 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
127 | static struct net_bridge_mdb_entry *br_mdb_ip6_get( |
128 | struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst) | |
129 | { | |
130 | struct br_ip br_dst; | |
0821ec55 | 131 | |
4e3fd7a0 | 132 | br_dst.u.ip6 = *dst; |
08b202b6 YH |
133 | br_dst.proto = htons(ETH_P_IPV6); |
134 | ||
7f285fa7 | 135 | return br_mdb_ip_get(mdb, &br_dst); |
08b202b6 YH |
136 | } |
137 | #endif | |
138 | ||
eb1d1641 HX |
139 | struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, |
140 | struct sk_buff *skb) | |
141 | { | |
e8051688 | 142 | struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb); |
8ef2a9a5 YH |
143 | struct br_ip ip; |
144 | ||
7f285fa7 | 145 | if (br->multicast_disabled) |
eb1d1641 HX |
146 | return NULL; |
147 | ||
8ef2a9a5 | 148 | if (BR_INPUT_SKB_CB(skb)->igmp) |
eb1d1641 HX |
149 | return NULL; |
150 | ||
8ef2a9a5 YH |
151 | ip.proto = skb->protocol; |
152 | ||
eb1d1641 HX |
153 | switch (skb->protocol) { |
154 | case htons(ETH_P_IP): | |
8ef2a9a5 YH |
155 | ip.u.ip4 = ip_hdr(skb)->daddr; |
156 | break; | |
dfd56b8b | 157 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 158 | case htons(ETH_P_IPV6): |
4e3fd7a0 | 159 | ip.u.ip6 = ipv6_hdr(skb)->daddr; |
08b202b6 YH |
160 | break; |
161 | #endif | |
8ef2a9a5 YH |
162 | default: |
163 | return NULL; | |
eb1d1641 HX |
164 | } |
165 | ||
8ef2a9a5 | 166 | return br_mdb_ip_get(mdb, &ip); |
eb1d1641 HX |
167 | } |
168 | ||
169 | static void br_mdb_free(struct rcu_head *head) | |
170 | { | |
171 | struct net_bridge_mdb_htable *mdb = | |
172 | container_of(head, struct net_bridge_mdb_htable, rcu); | |
173 | struct net_bridge_mdb_htable *old = mdb->old; | |
174 | ||
175 | mdb->old = NULL; | |
176 | kfree(old->mhash); | |
177 | kfree(old); | |
178 | } | |
179 | ||
180 | static int br_mdb_copy(struct net_bridge_mdb_htable *new, | |
181 | struct net_bridge_mdb_htable *old, | |
182 | int elasticity) | |
183 | { | |
184 | struct net_bridge_mdb_entry *mp; | |
185 | struct hlist_node *p; | |
186 | int maxlen; | |
187 | int len; | |
188 | int i; | |
189 | ||
190 | for (i = 0; i < old->max; i++) | |
191 | hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver]) | |
192 | hlist_add_head(&mp->hlist[new->ver], | |
8ef2a9a5 | 193 | &new->mhash[br_ip_hash(new, &mp->addr)]); |
eb1d1641 HX |
194 | |
195 | if (!elasticity) | |
196 | return 0; | |
197 | ||
198 | maxlen = 0; | |
199 | for (i = 0; i < new->max; i++) { | |
200 | len = 0; | |
201 | hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver]) | |
202 | len++; | |
203 | if (len > maxlen) | |
204 | maxlen = len; | |
205 | } | |
206 | ||
207 | return maxlen > elasticity ? -EINVAL : 0; | |
208 | } | |
209 | ||
210 | static void br_multicast_free_pg(struct rcu_head *head) | |
211 | { | |
212 | struct net_bridge_port_group *p = | |
213 | container_of(head, struct net_bridge_port_group, rcu); | |
214 | ||
215 | kfree(p); | |
216 | } | |
217 | ||
218 | static void br_multicast_free_group(struct rcu_head *head) | |
219 | { | |
220 | struct net_bridge_mdb_entry *mp = | |
221 | container_of(head, struct net_bridge_mdb_entry, rcu); | |
222 | ||
223 | kfree(mp); | |
224 | } | |
225 | ||
226 | static void br_multicast_group_expired(unsigned long data) | |
227 | { | |
228 | struct net_bridge_mdb_entry *mp = (void *)data; | |
229 | struct net_bridge *br = mp->br; | |
230 | struct net_bridge_mdb_htable *mdb; | |
231 | ||
232 | spin_lock(&br->multicast_lock); | |
233 | if (!netif_running(br->dev) || timer_pending(&mp->timer)) | |
234 | goto out; | |
235 | ||
8a870178 | 236 | mp->mglist = false; |
eb1d1641 HX |
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 | ||
eb1d1641 HX |
246 | call_rcu_bh(&mp->rcu, br_multicast_free_group); |
247 | ||
248 | out: | |
249 | spin_unlock(&br->multicast_lock); | |
250 | } | |
251 | ||
252 | static void br_multicast_del_pg(struct net_bridge *br, | |
253 | struct net_bridge_port_group *pg) | |
254 | { | |
e8051688 | 255 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 HX |
256 | struct net_bridge_mdb_entry *mp; |
257 | struct net_bridge_port_group *p; | |
e8051688 ED |
258 | struct net_bridge_port_group __rcu **pp; |
259 | ||
260 | mdb = mlock_dereference(br->mdb, br); | |
eb1d1641 | 261 | |
8ef2a9a5 | 262 | mp = br_mdb_ip_get(mdb, &pg->addr); |
eb1d1641 HX |
263 | if (WARN_ON(!mp)) |
264 | return; | |
265 | ||
e8051688 ED |
266 | for (pp = &mp->ports; |
267 | (p = mlock_dereference(*pp, br)) != NULL; | |
268 | pp = &p->next) { | |
eb1d1641 HX |
269 | if (p != pg) |
270 | continue; | |
271 | ||
83f6a740 | 272 | rcu_assign_pointer(*pp, p->next); |
eb1d1641 HX |
273 | hlist_del_init(&p->mglist); |
274 | del_timer(&p->timer); | |
eb1d1641 HX |
275 | call_rcu_bh(&p->rcu, br_multicast_free_pg); |
276 | ||
8a870178 | 277 | if (!mp->ports && !mp->mglist && |
eb1d1641 HX |
278 | netif_running(br->dev)) |
279 | mod_timer(&mp->timer, jiffies); | |
280 | ||
281 | return; | |
282 | } | |
283 | ||
284 | WARN_ON(1); | |
285 | } | |
286 | ||
287 | static void br_multicast_port_group_expired(unsigned long data) | |
288 | { | |
289 | struct net_bridge_port_group *pg = (void *)data; | |
290 | struct net_bridge *br = pg->port->br; | |
291 | ||
292 | spin_lock(&br->multicast_lock); | |
293 | if (!netif_running(br->dev) || timer_pending(&pg->timer) || | |
294 | hlist_unhashed(&pg->mglist)) | |
295 | goto out; | |
296 | ||
297 | br_multicast_del_pg(br, pg); | |
298 | ||
299 | out: | |
300 | spin_unlock(&br->multicast_lock); | |
301 | } | |
302 | ||
e8051688 | 303 | static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max, |
eb1d1641 HX |
304 | int elasticity) |
305 | { | |
e8051688 | 306 | struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1); |
eb1d1641 HX |
307 | struct net_bridge_mdb_htable *mdb; |
308 | int err; | |
309 | ||
310 | mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC); | |
311 | if (!mdb) | |
312 | return -ENOMEM; | |
313 | ||
314 | mdb->max = max; | |
315 | mdb->old = old; | |
316 | ||
317 | mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC); | |
318 | if (!mdb->mhash) { | |
319 | kfree(mdb); | |
320 | return -ENOMEM; | |
321 | } | |
322 | ||
323 | mdb->size = old ? old->size : 0; | |
324 | mdb->ver = old ? old->ver ^ 1 : 0; | |
325 | ||
326 | if (!old || elasticity) | |
327 | get_random_bytes(&mdb->secret, sizeof(mdb->secret)); | |
328 | else | |
329 | mdb->secret = old->secret; | |
330 | ||
331 | if (!old) | |
332 | goto out; | |
333 | ||
334 | err = br_mdb_copy(mdb, old, elasticity); | |
335 | if (err) { | |
336 | kfree(mdb->mhash); | |
337 | kfree(mdb); | |
338 | return err; | |
339 | } | |
340 | ||
341 | call_rcu_bh(&mdb->rcu, br_mdb_free); | |
342 | ||
343 | out: | |
344 | rcu_assign_pointer(*mdbp, mdb); | |
345 | ||
346 | return 0; | |
347 | } | |
348 | ||
8ef2a9a5 YH |
349 | static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br, |
350 | __be32 group) | |
eb1d1641 HX |
351 | { |
352 | struct sk_buff *skb; | |
353 | struct igmphdr *ih; | |
354 | struct ethhdr *eth; | |
355 | struct iphdr *iph; | |
356 | ||
357 | skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) + | |
358 | sizeof(*ih) + 4); | |
359 | if (!skb) | |
360 | goto out; | |
361 | ||
362 | skb->protocol = htons(ETH_P_IP); | |
363 | ||
364 | skb_reset_mac_header(skb); | |
365 | eth = eth_hdr(skb); | |
366 | ||
367 | memcpy(eth->h_source, br->dev->dev_addr, 6); | |
368 | eth->h_dest[0] = 1; | |
369 | eth->h_dest[1] = 0; | |
370 | eth->h_dest[2] = 0x5e; | |
371 | eth->h_dest[3] = 0; | |
372 | eth->h_dest[4] = 0; | |
373 | eth->h_dest[5] = 1; | |
374 | eth->h_proto = htons(ETH_P_IP); | |
375 | skb_put(skb, sizeof(*eth)); | |
376 | ||
377 | skb_set_network_header(skb, skb->len); | |
378 | iph = ip_hdr(skb); | |
379 | ||
380 | iph->version = 4; | |
381 | iph->ihl = 6; | |
382 | iph->tos = 0xc0; | |
383 | iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4); | |
384 | iph->id = 0; | |
385 | iph->frag_off = htons(IP_DF); | |
386 | iph->ttl = 1; | |
387 | iph->protocol = IPPROTO_IGMP; | |
388 | iph->saddr = 0; | |
389 | iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); | |
390 | ((u8 *)&iph[1])[0] = IPOPT_RA; | |
391 | ((u8 *)&iph[1])[1] = 4; | |
392 | ((u8 *)&iph[1])[2] = 0; | |
393 | ((u8 *)&iph[1])[3] = 0; | |
394 | ip_send_check(iph); | |
395 | skb_put(skb, 24); | |
396 | ||
397 | skb_set_transport_header(skb, skb->len); | |
398 | ih = igmp_hdr(skb); | |
399 | ih->type = IGMP_HOST_MEMBERSHIP_QUERY; | |
400 | ih->code = (group ? br->multicast_last_member_interval : | |
401 | br->multicast_query_response_interval) / | |
402 | (HZ / IGMP_TIMER_SCALE); | |
403 | ih->group = group; | |
404 | ih->csum = 0; | |
405 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
406 | skb_put(skb, sizeof(*ih)); | |
407 | ||
408 | __skb_pull(skb, sizeof(*eth)); | |
409 | ||
410 | out: | |
411 | return skb; | |
412 | } | |
413 | ||
dfd56b8b | 414 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 415 | static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, |
b71d1d42 | 416 | const struct in6_addr *group) |
08b202b6 YH |
417 | { |
418 | struct sk_buff *skb; | |
419 | struct ipv6hdr *ip6h; | |
420 | struct mld_msg *mldq; | |
421 | struct ethhdr *eth; | |
422 | u8 *hopopt; | |
423 | unsigned long interval; | |
424 | ||
425 | skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) + | |
426 | 8 + sizeof(*mldq)); | |
427 | if (!skb) | |
428 | goto out; | |
429 | ||
430 | skb->protocol = htons(ETH_P_IPV6); | |
431 | ||
432 | /* Ethernet header */ | |
433 | skb_reset_mac_header(skb); | |
434 | eth = eth_hdr(skb); | |
435 | ||
436 | memcpy(eth->h_source, br->dev->dev_addr, 6); | |
08b202b6 YH |
437 | eth->h_proto = htons(ETH_P_IPV6); |
438 | skb_put(skb, sizeof(*eth)); | |
439 | ||
440 | /* IPv6 header + HbH option */ | |
441 | skb_set_network_header(skb, skb->len); | |
442 | ip6h = ipv6_hdr(skb); | |
443 | ||
444 | *(__force __be32 *)ip6h = htonl(0x60000000); | |
76d66158 | 445 | ip6h->payload_len = htons(8 + sizeof(*mldq)); |
08b202b6 YH |
446 | ip6h->nexthdr = IPPROTO_HOPOPTS; |
447 | ip6h->hop_limit = 1; | |
a7bff75b | 448 | ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1)); |
d1d81d4c UW |
449 | if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0, |
450 | &ip6h->saddr)) { | |
451 | kfree_skb(skb); | |
452 | return NULL; | |
453 | } | |
36cff5a1 | 454 | ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); |
08b202b6 YH |
455 | |
456 | hopopt = (u8 *)(ip6h + 1); | |
457 | hopopt[0] = IPPROTO_ICMPV6; /* next hdr */ | |
458 | hopopt[1] = 0; /* length of HbH */ | |
459 | hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */ | |
460 | hopopt[3] = 2; /* Length of RA Option */ | |
461 | hopopt[4] = 0; /* Type = 0x0000 (MLD) */ | |
462 | hopopt[5] = 0; | |
1de5a71c EZ |
463 | hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */ |
464 | hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */ | |
08b202b6 YH |
465 | |
466 | skb_put(skb, sizeof(*ip6h) + 8); | |
467 | ||
468 | /* ICMPv6 */ | |
469 | skb_set_transport_header(skb, skb->len); | |
470 | mldq = (struct mld_msg *) icmp6_hdr(skb); | |
471 | ||
472 | interval = ipv6_addr_any(group) ? br->multicast_last_member_interval : | |
473 | br->multicast_query_response_interval; | |
474 | ||
475 | mldq->mld_type = ICMPV6_MGM_QUERY; | |
476 | mldq->mld_code = 0; | |
477 | mldq->mld_cksum = 0; | |
478 | mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); | |
479 | mldq->mld_reserved = 0; | |
4e3fd7a0 | 480 | mldq->mld_mca = *group; |
08b202b6 YH |
481 | |
482 | /* checksum */ | |
483 | mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
484 | sizeof(*mldq), IPPROTO_ICMPV6, | |
485 | csum_partial(mldq, | |
486 | sizeof(*mldq), 0)); | |
487 | skb_put(skb, sizeof(*mldq)); | |
488 | ||
489 | __skb_pull(skb, sizeof(*eth)); | |
490 | ||
491 | out: | |
492 | return skb; | |
493 | } | |
494 | #endif | |
495 | ||
8ef2a9a5 YH |
496 | static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, |
497 | struct br_ip *addr) | |
498 | { | |
499 | switch (addr->proto) { | |
500 | case htons(ETH_P_IP): | |
501 | return br_ip4_multicast_alloc_query(br, addr->u.ip4); | |
dfd56b8b | 502 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
503 | case htons(ETH_P_IPV6): |
504 | return br_ip6_multicast_alloc_query(br, &addr->u.ip6); | |
505 | #endif | |
8ef2a9a5 YH |
506 | } |
507 | return NULL; | |
508 | } | |
509 | ||
eb1d1641 | 510 | static struct net_bridge_mdb_entry *br_multicast_get_group( |
8ef2a9a5 YH |
511 | struct net_bridge *br, struct net_bridge_port *port, |
512 | struct br_ip *group, int hash) | |
eb1d1641 | 513 | { |
e8051688 | 514 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 HX |
515 | struct net_bridge_mdb_entry *mp; |
516 | struct hlist_node *p; | |
95c96174 ED |
517 | unsigned int count = 0; |
518 | unsigned int max; | |
eb1d1641 HX |
519 | int elasticity; |
520 | int err; | |
521 | ||
e8051688 | 522 | mdb = rcu_dereference_protected(br->mdb, 1); |
eb1d1641 HX |
523 | hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) { |
524 | count++; | |
8ef2a9a5 | 525 | if (unlikely(br_ip_equal(group, &mp->addr))) |
eb1d1641 | 526 | return mp; |
eb1d1641 HX |
527 | } |
528 | ||
529 | elasticity = 0; | |
530 | max = mdb->max; | |
531 | ||
532 | if (unlikely(count > br->hash_elasticity && count)) { | |
533 | if (net_ratelimit()) | |
28a16c97 | 534 | br_info(br, "Multicast hash table " |
535 | "chain limit reached: %s\n", | |
536 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
537 | |
538 | elasticity = br->hash_elasticity; | |
539 | } | |
540 | ||
541 | if (mdb->size >= max) { | |
542 | max *= 2; | |
543 | if (unlikely(max >= br->hash_max)) { | |
28a16c97 | 544 | br_warn(br, "Multicast hash table maximum " |
545 | "reached, disabling snooping: %s, %d\n", | |
546 | port ? port->dev->name : br->dev->name, max); | |
eb1d1641 HX |
547 | err = -E2BIG; |
548 | disable: | |
549 | br->multicast_disabled = 1; | |
550 | goto err; | |
551 | } | |
552 | } | |
553 | ||
554 | if (max > mdb->max || elasticity) { | |
555 | if (mdb->old) { | |
556 | if (net_ratelimit()) | |
28a16c97 | 557 | br_info(br, "Multicast hash table " |
558 | "on fire: %s\n", | |
559 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
560 | err = -EEXIST; |
561 | goto err; | |
562 | } | |
563 | ||
564 | err = br_mdb_rehash(&br->mdb, max, elasticity); | |
565 | if (err) { | |
28a16c97 | 566 | br_warn(br, "Cannot rehash multicast " |
567 | "hash table, disabling snooping: %s, %d, %d\n", | |
568 | port ? port->dev->name : br->dev->name, | |
569 | mdb->size, err); | |
eb1d1641 HX |
570 | goto disable; |
571 | } | |
572 | ||
573 | err = -EAGAIN; | |
574 | goto err; | |
575 | } | |
576 | ||
577 | return NULL; | |
578 | ||
579 | err: | |
580 | mp = ERR_PTR(err); | |
581 | return mp; | |
582 | } | |
583 | ||
584 | static struct net_bridge_mdb_entry *br_multicast_new_group( | |
8ef2a9a5 YH |
585 | struct net_bridge *br, struct net_bridge_port *port, |
586 | struct br_ip *group) | |
eb1d1641 | 587 | { |
e8051688 | 588 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 HX |
589 | struct net_bridge_mdb_entry *mp; |
590 | int hash; | |
4c0833bc | 591 | int err; |
eb1d1641 | 592 | |
e8051688 | 593 | mdb = rcu_dereference_protected(br->mdb, 1); |
eb1d1641 | 594 | if (!mdb) { |
4c0833bc TK |
595 | err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0); |
596 | if (err) | |
597 | return ERR_PTR(err); | |
eb1d1641 HX |
598 | goto rehash; |
599 | } | |
600 | ||
601 | hash = br_ip_hash(mdb, group); | |
602 | mp = br_multicast_get_group(br, port, group, hash); | |
603 | switch (PTR_ERR(mp)) { | |
604 | case 0: | |
605 | break; | |
606 | ||
607 | case -EAGAIN: | |
608 | rehash: | |
e8051688 | 609 | mdb = rcu_dereference_protected(br->mdb, 1); |
eb1d1641 HX |
610 | hash = br_ip_hash(mdb, group); |
611 | break; | |
612 | ||
613 | default: | |
614 | goto out; | |
615 | } | |
616 | ||
617 | mp = kzalloc(sizeof(*mp), GFP_ATOMIC); | |
618 | if (unlikely(!mp)) | |
4c0833bc | 619 | return ERR_PTR(-ENOMEM); |
eb1d1641 HX |
620 | |
621 | mp->br = br; | |
8ef2a9a5 | 622 | mp->addr = *group; |
eb1d1641 HX |
623 | setup_timer(&mp->timer, br_multicast_group_expired, |
624 | (unsigned long)mp); | |
eb1d1641 HX |
625 | |
626 | hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]); | |
627 | mdb->size++; | |
628 | ||
629 | out: | |
630 | return mp; | |
631 | } | |
632 | ||
633 | static int br_multicast_add_group(struct net_bridge *br, | |
8ef2a9a5 YH |
634 | struct net_bridge_port *port, |
635 | struct br_ip *group) | |
eb1d1641 HX |
636 | { |
637 | struct net_bridge_mdb_entry *mp; | |
638 | struct net_bridge_port_group *p; | |
e8051688 | 639 | struct net_bridge_port_group __rcu **pp; |
eb1d1641 HX |
640 | unsigned long now = jiffies; |
641 | int err; | |
642 | ||
eb1d1641 HX |
643 | spin_lock(&br->multicast_lock); |
644 | if (!netif_running(br->dev) || | |
645 | (port && port->state == BR_STATE_DISABLED)) | |
646 | goto out; | |
647 | ||
648 | mp = br_multicast_new_group(br, port, group); | |
649 | err = PTR_ERR(mp); | |
4c0833bc | 650 | if (IS_ERR(mp)) |
eb1d1641 HX |
651 | goto err; |
652 | ||
653 | if (!port) { | |
8a870178 | 654 | mp->mglist = true; |
eb1d1641 HX |
655 | mod_timer(&mp->timer, now + br->multicast_membership_interval); |
656 | goto out; | |
657 | } | |
658 | ||
e8051688 ED |
659 | for (pp = &mp->ports; |
660 | (p = mlock_dereference(*pp, br)) != NULL; | |
661 | pp = &p->next) { | |
eb1d1641 HX |
662 | if (p->port == port) |
663 | goto found; | |
664 | if ((unsigned long)p->port < (unsigned long)port) | |
665 | break; | |
666 | } | |
667 | ||
668 | p = kzalloc(sizeof(*p), GFP_ATOMIC); | |
669 | err = -ENOMEM; | |
670 | if (unlikely(!p)) | |
671 | goto err; | |
672 | ||
8ef2a9a5 | 673 | p->addr = *group; |
eb1d1641 HX |
674 | p->port = port; |
675 | p->next = *pp; | |
676 | hlist_add_head(&p->mglist, &port->mglist); | |
677 | setup_timer(&p->timer, br_multicast_port_group_expired, | |
678 | (unsigned long)p); | |
eb1d1641 HX |
679 | |
680 | rcu_assign_pointer(*pp, p); | |
681 | ||
682 | found: | |
683 | mod_timer(&p->timer, now + br->multicast_membership_interval); | |
684 | out: | |
685 | err = 0; | |
686 | ||
687 | err: | |
688 | spin_unlock(&br->multicast_lock); | |
689 | return err; | |
690 | } | |
691 | ||
8ef2a9a5 YH |
692 | static int br_ip4_multicast_add_group(struct net_bridge *br, |
693 | struct net_bridge_port *port, | |
694 | __be32 group) | |
695 | { | |
696 | struct br_ip br_group; | |
697 | ||
698 | if (ipv4_is_local_multicast(group)) | |
699 | return 0; | |
700 | ||
701 | br_group.u.ip4 = group; | |
702 | br_group.proto = htons(ETH_P_IP); | |
703 | ||
704 | return br_multicast_add_group(br, port, &br_group); | |
705 | } | |
706 | ||
dfd56b8b | 707 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
708 | static int br_ip6_multicast_add_group(struct net_bridge *br, |
709 | struct net_bridge_port *port, | |
710 | const struct in6_addr *group) | |
711 | { | |
712 | struct br_ip br_group; | |
713 | ||
e4de9f9e | 714 | if (!ipv6_is_transient_multicast(group)) |
08b202b6 YH |
715 | return 0; |
716 | ||
4e3fd7a0 | 717 | br_group.u.ip6 = *group; |
9cc6e0c4 | 718 | br_group.proto = htons(ETH_P_IPV6); |
08b202b6 YH |
719 | |
720 | return br_multicast_add_group(br, port, &br_group); | |
721 | } | |
722 | #endif | |
723 | ||
eb1d1641 HX |
724 | static void br_multicast_router_expired(unsigned long data) |
725 | { | |
726 | struct net_bridge_port *port = (void *)data; | |
727 | struct net_bridge *br = port->br; | |
728 | ||
729 | spin_lock(&br->multicast_lock); | |
730 | if (port->multicast_router != 1 || | |
731 | timer_pending(&port->multicast_router_timer) || | |
732 | hlist_unhashed(&port->rlist)) | |
733 | goto out; | |
734 | ||
735 | hlist_del_init_rcu(&port->rlist); | |
736 | ||
737 | out: | |
738 | spin_unlock(&br->multicast_lock); | |
739 | } | |
740 | ||
741 | static void br_multicast_local_router_expired(unsigned long data) | |
742 | { | |
743 | } | |
744 | ||
c83b8fab HX |
745 | static void br_multicast_querier_expired(unsigned long data) |
746 | { | |
bb63f1f8 | 747 | struct net_bridge *br = (void *)data; |
c83b8fab HX |
748 | |
749 | spin_lock(&br->multicast_lock); | |
750 | if (!netif_running(br->dev) || br->multicast_disabled) | |
751 | goto out; | |
752 | ||
753 | br_multicast_start_querier(br); | |
754 | ||
755 | out: | |
756 | spin_unlock(&br->multicast_lock); | |
757 | } | |
758 | ||
8ef2a9a5 YH |
759 | static void __br_multicast_send_query(struct net_bridge *br, |
760 | struct net_bridge_port *port, | |
761 | struct br_ip *ip) | |
eb1d1641 | 762 | { |
eb1d1641 HX |
763 | struct sk_buff *skb; |
764 | ||
8ef2a9a5 | 765 | skb = br_multicast_alloc_query(br, ip); |
eb1d1641 | 766 | if (!skb) |
8ef2a9a5 | 767 | return; |
eb1d1641 HX |
768 | |
769 | if (port) { | |
770 | __skb_push(skb, sizeof(struct ethhdr)); | |
771 | skb->dev = port->dev; | |
713aefa3 | 772 | NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, |
eb1d1641 HX |
773 | dev_queue_xmit); |
774 | } else | |
775 | netif_rx(skb); | |
8ef2a9a5 YH |
776 | } |
777 | ||
778 | static void br_multicast_send_query(struct net_bridge *br, | |
779 | struct net_bridge_port *port, u32 sent) | |
780 | { | |
781 | unsigned long time; | |
782 | struct br_ip br_group; | |
783 | ||
784 | if (!netif_running(br->dev) || br->multicast_disabled || | |
c5c23260 | 785 | !br->multicast_querier || |
8ef2a9a5 YH |
786 | timer_pending(&br->multicast_querier_timer)) |
787 | return; | |
788 | ||
08b202b6 YH |
789 | memset(&br_group.u, 0, sizeof(br_group.u)); |
790 | ||
8ef2a9a5 | 791 | br_group.proto = htons(ETH_P_IP); |
08b202b6 | 792 | __br_multicast_send_query(br, port, &br_group); |
8ef2a9a5 | 793 | |
dfd56b8b | 794 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 795 | br_group.proto = htons(ETH_P_IPV6); |
8ef2a9a5 | 796 | __br_multicast_send_query(br, port, &br_group); |
08b202b6 | 797 | #endif |
eb1d1641 | 798 | |
eb1d1641 HX |
799 | time = jiffies; |
800 | time += sent < br->multicast_startup_query_count ? | |
801 | br->multicast_startup_query_interval : | |
802 | br->multicast_query_interval; | |
803 | mod_timer(port ? &port->multicast_query_timer : | |
804 | &br->multicast_query_timer, time); | |
805 | } | |
806 | ||
807 | static void br_multicast_port_query_expired(unsigned long data) | |
808 | { | |
809 | struct net_bridge_port *port = (void *)data; | |
810 | struct net_bridge *br = port->br; | |
811 | ||
812 | spin_lock(&br->multicast_lock); | |
02a780c0 DC |
813 | if (port->state == BR_STATE_DISABLED || |
814 | port->state == BR_STATE_BLOCKING) | |
eb1d1641 HX |
815 | goto out; |
816 | ||
817 | if (port->multicast_startup_queries_sent < | |
818 | br->multicast_startup_query_count) | |
819 | port->multicast_startup_queries_sent++; | |
820 | ||
821 | br_multicast_send_query(port->br, port, | |
822 | port->multicast_startup_queries_sent); | |
823 | ||
824 | out: | |
825 | spin_unlock(&br->multicast_lock); | |
826 | } | |
827 | ||
828 | void br_multicast_add_port(struct net_bridge_port *port) | |
829 | { | |
830 | port->multicast_router = 1; | |
831 | ||
832 | setup_timer(&port->multicast_router_timer, br_multicast_router_expired, | |
833 | (unsigned long)port); | |
834 | setup_timer(&port->multicast_query_timer, | |
835 | br_multicast_port_query_expired, (unsigned long)port); | |
836 | } | |
837 | ||
838 | void br_multicast_del_port(struct net_bridge_port *port) | |
839 | { | |
840 | del_timer_sync(&port->multicast_router_timer); | |
841 | } | |
842 | ||
561f1103 HX |
843 | static void __br_multicast_enable_port(struct net_bridge_port *port) |
844 | { | |
845 | port->multicast_startup_queries_sent = 0; | |
846 | ||
847 | if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 || | |
848 | del_timer(&port->multicast_query_timer)) | |
849 | mod_timer(&port->multicast_query_timer, jiffies); | |
850 | } | |
851 | ||
eb1d1641 HX |
852 | void br_multicast_enable_port(struct net_bridge_port *port) |
853 | { | |
854 | struct net_bridge *br = port->br; | |
855 | ||
856 | spin_lock(&br->multicast_lock); | |
857 | if (br->multicast_disabled || !netif_running(br->dev)) | |
858 | goto out; | |
859 | ||
561f1103 | 860 | __br_multicast_enable_port(port); |
eb1d1641 HX |
861 | |
862 | out: | |
863 | spin_unlock(&br->multicast_lock); | |
864 | } | |
865 | ||
866 | void br_multicast_disable_port(struct net_bridge_port *port) | |
867 | { | |
868 | struct net_bridge *br = port->br; | |
869 | struct net_bridge_port_group *pg; | |
870 | struct hlist_node *p, *n; | |
871 | ||
872 | spin_lock(&br->multicast_lock); | |
873 | hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist) | |
874 | br_multicast_del_pg(br, pg); | |
875 | ||
876 | if (!hlist_unhashed(&port->rlist)) | |
877 | hlist_del_init_rcu(&port->rlist); | |
878 | del_timer(&port->multicast_router_timer); | |
879 | del_timer(&port->multicast_query_timer); | |
880 | spin_unlock(&br->multicast_lock); | |
881 | } | |
882 | ||
8ef2a9a5 YH |
883 | static int br_ip4_multicast_igmp3_report(struct net_bridge *br, |
884 | struct net_bridge_port *port, | |
885 | struct sk_buff *skb) | |
eb1d1641 HX |
886 | { |
887 | struct igmpv3_report *ih; | |
888 | struct igmpv3_grec *grec; | |
889 | int i; | |
890 | int len; | |
891 | int num; | |
892 | int type; | |
893 | int err = 0; | |
894 | __be32 group; | |
895 | ||
896 | if (!pskb_may_pull(skb, sizeof(*ih))) | |
897 | return -EINVAL; | |
898 | ||
899 | ih = igmpv3_report_hdr(skb); | |
900 | num = ntohs(ih->ngrec); | |
901 | len = sizeof(*ih); | |
902 | ||
903 | for (i = 0; i < num; i++) { | |
904 | len += sizeof(*grec); | |
905 | if (!pskb_may_pull(skb, len)) | |
906 | return -EINVAL; | |
907 | ||
fd218cf9 | 908 | grec = (void *)(skb->data + len - sizeof(*grec)); |
eb1d1641 HX |
909 | group = grec->grec_mca; |
910 | type = grec->grec_type; | |
911 | ||
8eabf95c | 912 | len += ntohs(grec->grec_nsrcs) * 4; |
eb1d1641 HX |
913 | if (!pskb_may_pull(skb, len)) |
914 | return -EINVAL; | |
915 | ||
916 | /* We treat this as an IGMPv2 report for now. */ | |
917 | switch (type) { | |
918 | case IGMPV3_MODE_IS_INCLUDE: | |
919 | case IGMPV3_MODE_IS_EXCLUDE: | |
920 | case IGMPV3_CHANGE_TO_INCLUDE: | |
921 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
922 | case IGMPV3_ALLOW_NEW_SOURCES: | |
923 | case IGMPV3_BLOCK_OLD_SOURCES: | |
924 | break; | |
925 | ||
926 | default: | |
927 | continue; | |
928 | } | |
929 | ||
8ef2a9a5 | 930 | err = br_ip4_multicast_add_group(br, port, group); |
eb1d1641 HX |
931 | if (err) |
932 | break; | |
933 | } | |
934 | ||
935 | return err; | |
936 | } | |
937 | ||
dfd56b8b | 938 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
939 | static int br_ip6_multicast_mld2_report(struct net_bridge *br, |
940 | struct net_bridge_port *port, | |
941 | struct sk_buff *skb) | |
942 | { | |
943 | struct icmp6hdr *icmp6h; | |
944 | struct mld2_grec *grec; | |
945 | int i; | |
946 | int len; | |
947 | int num; | |
948 | int err = 0; | |
949 | ||
950 | if (!pskb_may_pull(skb, sizeof(*icmp6h))) | |
951 | return -EINVAL; | |
952 | ||
953 | icmp6h = icmp6_hdr(skb); | |
954 | num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); | |
955 | len = sizeof(*icmp6h); | |
956 | ||
957 | for (i = 0; i < num; i++) { | |
958 | __be16 *nsrcs, _nsrcs; | |
959 | ||
960 | nsrcs = skb_header_pointer(skb, | |
961 | len + offsetof(struct mld2_grec, | |
649e984d | 962 | grec_nsrcs), |
08b202b6 YH |
963 | sizeof(_nsrcs), &_nsrcs); |
964 | if (!nsrcs) | |
965 | return -EINVAL; | |
966 | ||
967 | if (!pskb_may_pull(skb, | |
968 | len + sizeof(*grec) + | |
d41db9f3 | 969 | sizeof(struct in6_addr) * ntohs(*nsrcs))) |
08b202b6 YH |
970 | return -EINVAL; |
971 | ||
972 | grec = (struct mld2_grec *)(skb->data + len); | |
d41db9f3 LL |
973 | len += sizeof(*grec) + |
974 | sizeof(struct in6_addr) * ntohs(*nsrcs); | |
08b202b6 YH |
975 | |
976 | /* We treat these as MLDv1 reports for now. */ | |
977 | switch (grec->grec_type) { | |
978 | case MLD2_MODE_IS_INCLUDE: | |
979 | case MLD2_MODE_IS_EXCLUDE: | |
980 | case MLD2_CHANGE_TO_INCLUDE: | |
981 | case MLD2_CHANGE_TO_EXCLUDE: | |
982 | case MLD2_ALLOW_NEW_SOURCES: | |
983 | case MLD2_BLOCK_OLD_SOURCES: | |
984 | break; | |
985 | ||
986 | default: | |
987 | continue; | |
988 | } | |
989 | ||
990 | err = br_ip6_multicast_add_group(br, port, &grec->grec_mca); | |
991 | if (!err) | |
992 | break; | |
993 | } | |
994 | ||
995 | return err; | |
996 | } | |
997 | #endif | |
998 | ||
7e80c124 | 999 | /* |
1000 | * Add port to rotuer_list | |
1001 | * list is maintained ordered by pointer value | |
1002 | * and locked by br->multicast_lock and RCU | |
1003 | */ | |
0909e117 HX |
1004 | static void br_multicast_add_router(struct net_bridge *br, |
1005 | struct net_bridge_port *port) | |
1006 | { | |
dcdca2c4 | 1007 | struct net_bridge_port *p; |
7e80c124 | 1008 | struct hlist_node *n, *slot = NULL; |
dcdca2c4 | 1009 | |
709b9326 | 1010 | hlist_for_each_entry(p, n, &br->router_list, rlist) { |
7e80c124 | 1011 | if ((unsigned long) port >= (unsigned long) p) |
1012 | break; | |
1013 | slot = n; | |
dcdca2c4 | 1014 | } |
1015 | ||
7e80c124 | 1016 | if (slot) |
1017 | hlist_add_after_rcu(slot, &port->rlist); | |
dcdca2c4 | 1018 | else |
1019 | hlist_add_head_rcu(&port->rlist, &br->router_list); | |
0909e117 HX |
1020 | } |
1021 | ||
eb1d1641 HX |
1022 | static void br_multicast_mark_router(struct net_bridge *br, |
1023 | struct net_bridge_port *port) | |
1024 | { | |
1025 | unsigned long now = jiffies; | |
eb1d1641 HX |
1026 | |
1027 | if (!port) { | |
1028 | if (br->multicast_router == 1) | |
1029 | mod_timer(&br->multicast_router_timer, | |
1030 | now + br->multicast_querier_interval); | |
1031 | return; | |
1032 | } | |
1033 | ||
1034 | if (port->multicast_router != 1) | |
1035 | return; | |
1036 | ||
1037 | if (!hlist_unhashed(&port->rlist)) | |
1038 | goto timer; | |
1039 | ||
0909e117 | 1040 | br_multicast_add_router(br, port); |
eb1d1641 HX |
1041 | |
1042 | timer: | |
1043 | mod_timer(&port->multicast_router_timer, | |
1044 | now + br->multicast_querier_interval); | |
1045 | } | |
1046 | ||
1047 | static void br_multicast_query_received(struct net_bridge *br, | |
1048 | struct net_bridge_port *port, | |
8ef2a9a5 | 1049 | int saddr) |
eb1d1641 HX |
1050 | { |
1051 | if (saddr) | |
1052 | mod_timer(&br->multicast_querier_timer, | |
1053 | jiffies + br->multicast_querier_interval); | |
1054 | else if (timer_pending(&br->multicast_querier_timer)) | |
1055 | return; | |
1056 | ||
1057 | br_multicast_mark_router(br, port); | |
1058 | } | |
1059 | ||
8ef2a9a5 YH |
1060 | static int br_ip4_multicast_query(struct net_bridge *br, |
1061 | struct net_bridge_port *port, | |
1062 | struct sk_buff *skb) | |
eb1d1641 | 1063 | { |
b71d1d42 | 1064 | const struct iphdr *iph = ip_hdr(skb); |
eb1d1641 HX |
1065 | struct igmphdr *ih = igmp_hdr(skb); |
1066 | struct net_bridge_mdb_entry *mp; | |
1067 | struct igmpv3_query *ih3; | |
1068 | struct net_bridge_port_group *p; | |
e8051688 | 1069 | struct net_bridge_port_group __rcu **pp; |
eb1d1641 HX |
1070 | unsigned long max_delay; |
1071 | unsigned long now = jiffies; | |
1072 | __be32 group; | |
bec68ff1 | 1073 | int err = 0; |
eb1d1641 HX |
1074 | |
1075 | spin_lock(&br->multicast_lock); | |
1076 | if (!netif_running(br->dev) || | |
1077 | (port && port->state == BR_STATE_DISABLED)) | |
1078 | goto out; | |
1079 | ||
8ef2a9a5 | 1080 | br_multicast_query_received(br, port, !!iph->saddr); |
eb1d1641 HX |
1081 | |
1082 | group = ih->group; | |
1083 | ||
1084 | if (skb->len == sizeof(*ih)) { | |
1085 | max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); | |
1086 | ||
1087 | if (!max_delay) { | |
1088 | max_delay = 10 * HZ; | |
1089 | group = 0; | |
1090 | } | |
1091 | } else { | |
bec68ff1 YH |
1092 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) { |
1093 | err = -EINVAL; | |
1094 | goto out; | |
1095 | } | |
eb1d1641 HX |
1096 | |
1097 | ih3 = igmpv3_query_hdr(skb); | |
1098 | if (ih3->nsrcs) | |
bec68ff1 | 1099 | goto out; |
eb1d1641 | 1100 | |
0ba8c9ec YH |
1101 | max_delay = ih3->code ? |
1102 | IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; | |
eb1d1641 HX |
1103 | } |
1104 | ||
1105 | if (!group) | |
1106 | goto out; | |
1107 | ||
e8051688 | 1108 | mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group); |
eb1d1641 HX |
1109 | if (!mp) |
1110 | goto out; | |
1111 | ||
1112 | max_delay *= br->multicast_last_member_count; | |
1113 | ||
8a870178 | 1114 | if (mp->mglist && |
eb1d1641 HX |
1115 | (timer_pending(&mp->timer) ? |
1116 | time_after(mp->timer.expires, now + max_delay) : | |
1117 | try_to_del_timer_sync(&mp->timer) >= 0)) | |
1118 | mod_timer(&mp->timer, now + max_delay); | |
1119 | ||
e8051688 ED |
1120 | for (pp = &mp->ports; |
1121 | (p = mlock_dereference(*pp, br)) != NULL; | |
1122 | pp = &p->next) { | |
eb1d1641 HX |
1123 | if (timer_pending(&p->timer) ? |
1124 | time_after(p->timer.expires, now + max_delay) : | |
1125 | try_to_del_timer_sync(&p->timer) >= 0) | |
24f9cdcb | 1126 | mod_timer(&p->timer, now + max_delay); |
eb1d1641 HX |
1127 | } |
1128 | ||
1129 | out: | |
1130 | spin_unlock(&br->multicast_lock); | |
bec68ff1 | 1131 | return err; |
eb1d1641 HX |
1132 | } |
1133 | ||
dfd56b8b | 1134 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1135 | static int br_ip6_multicast_query(struct net_bridge *br, |
1136 | struct net_bridge_port *port, | |
1137 | struct sk_buff *skb) | |
1138 | { | |
b71d1d42 | 1139 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
08b202b6 YH |
1140 | struct mld_msg *mld = (struct mld_msg *) icmp6_hdr(skb); |
1141 | struct net_bridge_mdb_entry *mp; | |
1142 | struct mld2_query *mld2q; | |
e8051688 ED |
1143 | struct net_bridge_port_group *p; |
1144 | struct net_bridge_port_group __rcu **pp; | |
08b202b6 YH |
1145 | unsigned long max_delay; |
1146 | unsigned long now = jiffies; | |
b71d1d42 | 1147 | const struct in6_addr *group = NULL; |
08b202b6 YH |
1148 | int err = 0; |
1149 | ||
1150 | spin_lock(&br->multicast_lock); | |
1151 | if (!netif_running(br->dev) || | |
1152 | (port && port->state == BR_STATE_DISABLED)) | |
1153 | goto out; | |
1154 | ||
1155 | br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr)); | |
1156 | ||
1157 | if (skb->len == sizeof(*mld)) { | |
1158 | if (!pskb_may_pull(skb, sizeof(*mld))) { | |
1159 | err = -EINVAL; | |
1160 | goto out; | |
1161 | } | |
1162 | mld = (struct mld_msg *) icmp6_hdr(skb); | |
4715213d | 1163 | max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay)); |
08b202b6 YH |
1164 | if (max_delay) |
1165 | group = &mld->mld_mca; | |
1166 | } else if (skb->len >= sizeof(*mld2q)) { | |
1167 | if (!pskb_may_pull(skb, sizeof(*mld2q))) { | |
1168 | err = -EINVAL; | |
1169 | goto out; | |
1170 | } | |
1171 | mld2q = (struct mld2_query *)icmp6_hdr(skb); | |
1172 | if (!mld2q->mld2q_nsrcs) | |
1173 | group = &mld2q->mld2q_mca; | |
1174 | max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(mld2q->mld2q_mrc) : 1; | |
1175 | } | |
1176 | ||
1177 | if (!group) | |
1178 | goto out; | |
1179 | ||
e8051688 | 1180 | mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group); |
08b202b6 YH |
1181 | if (!mp) |
1182 | goto out; | |
1183 | ||
1184 | max_delay *= br->multicast_last_member_count; | |
8a870178 | 1185 | if (mp->mglist && |
08b202b6 YH |
1186 | (timer_pending(&mp->timer) ? |
1187 | time_after(mp->timer.expires, now + max_delay) : | |
1188 | try_to_del_timer_sync(&mp->timer) >= 0)) | |
1189 | mod_timer(&mp->timer, now + max_delay); | |
1190 | ||
e8051688 ED |
1191 | for (pp = &mp->ports; |
1192 | (p = mlock_dereference(*pp, br)) != NULL; | |
1193 | pp = &p->next) { | |
08b202b6 YH |
1194 | if (timer_pending(&p->timer) ? |
1195 | time_after(p->timer.expires, now + max_delay) : | |
1196 | try_to_del_timer_sync(&p->timer) >= 0) | |
24f9cdcb | 1197 | mod_timer(&p->timer, now + max_delay); |
08b202b6 YH |
1198 | } |
1199 | ||
1200 | out: | |
1201 | spin_unlock(&br->multicast_lock); | |
1202 | return err; | |
1203 | } | |
1204 | #endif | |
1205 | ||
eb1d1641 HX |
1206 | static void br_multicast_leave_group(struct net_bridge *br, |
1207 | struct net_bridge_port *port, | |
8ef2a9a5 | 1208 | struct br_ip *group) |
eb1d1641 HX |
1209 | { |
1210 | struct net_bridge_mdb_htable *mdb; | |
1211 | struct net_bridge_mdb_entry *mp; | |
1212 | struct net_bridge_port_group *p; | |
1213 | unsigned long now; | |
1214 | unsigned long time; | |
1215 | ||
eb1d1641 HX |
1216 | spin_lock(&br->multicast_lock); |
1217 | if (!netif_running(br->dev) || | |
1218 | (port && port->state == BR_STATE_DISABLED) || | |
1219 | timer_pending(&br->multicast_querier_timer)) | |
1220 | goto out; | |
1221 | ||
e8051688 | 1222 | mdb = mlock_dereference(br->mdb, br); |
eb1d1641 HX |
1223 | mp = br_mdb_ip_get(mdb, group); |
1224 | if (!mp) | |
1225 | goto out; | |
1226 | ||
1227 | now = jiffies; | |
1228 | time = now + br->multicast_last_member_count * | |
1229 | br->multicast_last_member_interval; | |
1230 | ||
1231 | if (!port) { | |
8a870178 | 1232 | if (mp->mglist && |
eb1d1641 HX |
1233 | (timer_pending(&mp->timer) ? |
1234 | time_after(mp->timer.expires, time) : | |
1235 | try_to_del_timer_sync(&mp->timer) >= 0)) { | |
1236 | mod_timer(&mp->timer, time); | |
eb1d1641 HX |
1237 | } |
1238 | ||
1239 | goto out; | |
1240 | } | |
1241 | ||
e8051688 ED |
1242 | for (p = mlock_dereference(mp->ports, br); |
1243 | p != NULL; | |
1244 | p = mlock_dereference(p->next, br)) { | |
eb1d1641 HX |
1245 | if (p->port != port) |
1246 | continue; | |
1247 | ||
1248 | if (!hlist_unhashed(&p->mglist) && | |
1249 | (timer_pending(&p->timer) ? | |
1250 | time_after(p->timer.expires, time) : | |
1251 | try_to_del_timer_sync(&p->timer) >= 0)) { | |
1252 | mod_timer(&p->timer, time); | |
eb1d1641 HX |
1253 | } |
1254 | ||
1255 | break; | |
1256 | } | |
1257 | ||
1258 | out: | |
1259 | spin_unlock(&br->multicast_lock); | |
1260 | } | |
1261 | ||
8ef2a9a5 YH |
1262 | static void br_ip4_multicast_leave_group(struct net_bridge *br, |
1263 | struct net_bridge_port *port, | |
1264 | __be32 group) | |
1265 | { | |
1266 | struct br_ip br_group; | |
1267 | ||
1268 | if (ipv4_is_local_multicast(group)) | |
1269 | return; | |
1270 | ||
1271 | br_group.u.ip4 = group; | |
1272 | br_group.proto = htons(ETH_P_IP); | |
1273 | ||
1274 | br_multicast_leave_group(br, port, &br_group); | |
1275 | } | |
1276 | ||
dfd56b8b | 1277 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1278 | static void br_ip6_multicast_leave_group(struct net_bridge *br, |
1279 | struct net_bridge_port *port, | |
1280 | const struct in6_addr *group) | |
1281 | { | |
1282 | struct br_ip br_group; | |
1283 | ||
e4de9f9e | 1284 | if (!ipv6_is_transient_multicast(group)) |
08b202b6 YH |
1285 | return; |
1286 | ||
4e3fd7a0 | 1287 | br_group.u.ip6 = *group; |
08b202b6 YH |
1288 | br_group.proto = htons(ETH_P_IPV6); |
1289 | ||
1290 | br_multicast_leave_group(br, port, &br_group); | |
1291 | } | |
1292 | #endif | |
8ef2a9a5 | 1293 | |
eb1d1641 HX |
1294 | static int br_multicast_ipv4_rcv(struct net_bridge *br, |
1295 | struct net_bridge_port *port, | |
1296 | struct sk_buff *skb) | |
1297 | { | |
1298 | struct sk_buff *skb2 = skb; | |
b71d1d42 | 1299 | const struct iphdr *iph; |
eb1d1641 | 1300 | struct igmphdr *ih; |
95c96174 ED |
1301 | unsigned int len; |
1302 | unsigned int offset; | |
eb1d1641 HX |
1303 | int err; |
1304 | ||
eb1d1641 HX |
1305 | /* We treat OOM as packet loss for now. */ |
1306 | if (!pskb_may_pull(skb, sizeof(*iph))) | |
1307 | return -EINVAL; | |
1308 | ||
1309 | iph = ip_hdr(skb); | |
1310 | ||
1311 | if (iph->ihl < 5 || iph->version != 4) | |
1312 | return -EINVAL; | |
1313 | ||
1314 | if (!pskb_may_pull(skb, ip_hdrlen(skb))) | |
1315 | return -EINVAL; | |
1316 | ||
1317 | iph = ip_hdr(skb); | |
1318 | ||
1319 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
1320 | return -EINVAL; | |
1321 | ||
bd4265fe HX |
1322 | if (iph->protocol != IPPROTO_IGMP) { |
1323 | if ((iph->daddr & IGMP_LOCAL_GROUP_MASK) != IGMP_LOCAL_GROUP) | |
1324 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; | |
eb1d1641 | 1325 | return 0; |
bd4265fe | 1326 | } |
eb1d1641 HX |
1327 | |
1328 | len = ntohs(iph->tot_len); | |
1329 | if (skb->len < len || len < ip_hdrlen(skb)) | |
1330 | return -EINVAL; | |
1331 | ||
1332 | if (skb->len > len) { | |
1333 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1334 | if (!skb2) | |
1335 | return -ENOMEM; | |
1336 | ||
1337 | err = pskb_trim_rcsum(skb2, len); | |
1338 | if (err) | |
8440853b | 1339 | goto err_out; |
eb1d1641 HX |
1340 | } |
1341 | ||
1342 | len -= ip_hdrlen(skb2); | |
1343 | offset = skb_network_offset(skb2) + ip_hdrlen(skb2); | |
1344 | __skb_pull(skb2, offset); | |
1345 | skb_reset_transport_header(skb2); | |
1346 | ||
1347 | err = -EINVAL; | |
1348 | if (!pskb_may_pull(skb2, sizeof(*ih))) | |
1349 | goto out; | |
1350 | ||
eb1d1641 HX |
1351 | switch (skb2->ip_summed) { |
1352 | case CHECKSUM_COMPLETE: | |
1353 | if (!csum_fold(skb2->csum)) | |
1354 | break; | |
1355 | /* fall through */ | |
1356 | case CHECKSUM_NONE: | |
1357 | skb2->csum = 0; | |
1358 | if (skb_checksum_complete(skb2)) | |
8440853b | 1359 | goto out; |
eb1d1641 HX |
1360 | } |
1361 | ||
1362 | err = 0; | |
1363 | ||
1364 | BR_INPUT_SKB_CB(skb)->igmp = 1; | |
1365 | ih = igmp_hdr(skb2); | |
1366 | ||
1367 | switch (ih->type) { | |
1368 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1369 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
62b2bcb4 | 1370 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
8ef2a9a5 | 1371 | err = br_ip4_multicast_add_group(br, port, ih->group); |
eb1d1641 HX |
1372 | break; |
1373 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
8ef2a9a5 | 1374 | err = br_ip4_multicast_igmp3_report(br, port, skb2); |
eb1d1641 HX |
1375 | break; |
1376 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
8ef2a9a5 | 1377 | err = br_ip4_multicast_query(br, port, skb2); |
eb1d1641 HX |
1378 | break; |
1379 | case IGMP_HOST_LEAVE_MESSAGE: | |
8ef2a9a5 | 1380 | br_ip4_multicast_leave_group(br, port, ih->group); |
eb1d1641 HX |
1381 | break; |
1382 | } | |
1383 | ||
1384 | out: | |
1385 | __skb_push(skb2, offset); | |
8440853b | 1386 | err_out: |
eb1d1641 HX |
1387 | if (skb2 != skb) |
1388 | kfree_skb(skb2); | |
1389 | return err; | |
1390 | } | |
1391 | ||
dfd56b8b | 1392 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1393 | static int br_multicast_ipv6_rcv(struct net_bridge *br, |
1394 | struct net_bridge_port *port, | |
1395 | struct sk_buff *skb) | |
1396 | { | |
9d89081d | 1397 | struct sk_buff *skb2; |
b71d1d42 | 1398 | const struct ipv6hdr *ip6h; |
22df1331 | 1399 | u8 icmp6_type; |
08b202b6 | 1400 | u8 nexthdr; |
75f2811c | 1401 | __be16 frag_off; |
95c96174 | 1402 | unsigned int len; |
bb7a0bd6 | 1403 | int offset; |
08b202b6 YH |
1404 | int err; |
1405 | ||
08b202b6 YH |
1406 | if (!pskb_may_pull(skb, sizeof(*ip6h))) |
1407 | return -EINVAL; | |
1408 | ||
1409 | ip6h = ipv6_hdr(skb); | |
1410 | ||
1411 | /* | |
1412 | * We're interested in MLD messages only. | |
1413 | * - Version is 6 | |
1414 | * - MLD has always Router Alert hop-by-hop option | |
1415 | * - But we do not support jumbrograms. | |
1416 | */ | |
1417 | if (ip6h->version != 6 || | |
1418 | ip6h->nexthdr != IPPROTO_HOPOPTS || | |
1419 | ip6h->payload_len == 0) | |
1420 | return 0; | |
1421 | ||
ff9a57a6 | 1422 | len = ntohs(ip6h->payload_len) + sizeof(*ip6h); |
08b202b6 YH |
1423 | if (skb->len < len) |
1424 | return -EINVAL; | |
1425 | ||
1426 | nexthdr = ip6h->nexthdr; | |
75f2811c | 1427 | offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off); |
08b202b6 YH |
1428 | |
1429 | if (offset < 0 || nexthdr != IPPROTO_ICMPV6) | |
1430 | return 0; | |
1431 | ||
1432 | /* Okay, we found ICMPv6 header */ | |
1433 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1434 | if (!skb2) | |
1435 | return -ENOMEM; | |
1436 | ||
9d89081d TW |
1437 | err = -EINVAL; |
1438 | if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr))) | |
1439 | goto out; | |
1440 | ||
08b202b6 YH |
1441 | len -= offset - skb_network_offset(skb2); |
1442 | ||
1443 | __skb_pull(skb2, offset); | |
1444 | skb_reset_transport_header(skb2); | |
fa2da8cd | 1445 | skb_postpull_rcsum(skb2, skb_network_header(skb2), |
1446 | skb_network_header_len(skb2)); | |
08b202b6 | 1447 | |
22df1331 | 1448 | icmp6_type = icmp6_hdr(skb2)->icmp6_type; |
08b202b6 | 1449 | |
22df1331 | 1450 | switch (icmp6_type) { |
08b202b6 YH |
1451 | case ICMPV6_MGM_QUERY: |
1452 | case ICMPV6_MGM_REPORT: | |
1453 | case ICMPV6_MGM_REDUCTION: | |
1454 | case ICMPV6_MLD2_REPORT: | |
1455 | break; | |
1456 | default: | |
1457 | err = 0; | |
1458 | goto out; | |
1459 | } | |
1460 | ||
1461 | /* Okay, we found MLD message. Check further. */ | |
1462 | if (skb2->len > len) { | |
1463 | err = pskb_trim_rcsum(skb2, len); | |
1464 | if (err) | |
1465 | goto out; | |
4b275d7e | 1466 | err = -EINVAL; |
08b202b6 YH |
1467 | } |
1468 | ||
4b275d7e YZ |
1469 | ip6h = ipv6_hdr(skb2); |
1470 | ||
08b202b6 YH |
1471 | switch (skb2->ip_summed) { |
1472 | case CHECKSUM_COMPLETE: | |
4b275d7e YZ |
1473 | if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len, |
1474 | IPPROTO_ICMPV6, skb2->csum)) | |
08b202b6 YH |
1475 | break; |
1476 | /*FALLTHROUGH*/ | |
1477 | case CHECKSUM_NONE: | |
4b275d7e YZ |
1478 | skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr, |
1479 | &ip6h->daddr, | |
1480 | skb2->len, | |
1481 | IPPROTO_ICMPV6, 0)); | |
1482 | if (__skb_checksum_complete(skb2)) | |
08b202b6 YH |
1483 | goto out; |
1484 | } | |
1485 | ||
1486 | err = 0; | |
1487 | ||
1488 | BR_INPUT_SKB_CB(skb)->igmp = 1; | |
1489 | ||
22df1331 | 1490 | switch (icmp6_type) { |
08b202b6 YH |
1491 | case ICMPV6_MGM_REPORT: |
1492 | { | |
9d89081d TW |
1493 | struct mld_msg *mld; |
1494 | if (!pskb_may_pull(skb2, sizeof(*mld))) { | |
1495 | err = -EINVAL; | |
1496 | goto out; | |
1497 | } | |
1498 | mld = (struct mld_msg *)skb_transport_header(skb2); | |
fc2af6c7 | 1499 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
08b202b6 YH |
1500 | err = br_ip6_multicast_add_group(br, port, &mld->mld_mca); |
1501 | break; | |
1502 | } | |
1503 | case ICMPV6_MLD2_REPORT: | |
1504 | err = br_ip6_multicast_mld2_report(br, port, skb2); | |
1505 | break; | |
1506 | case ICMPV6_MGM_QUERY: | |
1507 | err = br_ip6_multicast_query(br, port, skb2); | |
1508 | break; | |
1509 | case ICMPV6_MGM_REDUCTION: | |
1510 | { | |
9d89081d TW |
1511 | struct mld_msg *mld; |
1512 | if (!pskb_may_pull(skb2, sizeof(*mld))) { | |
1513 | err = -EINVAL; | |
1514 | goto out; | |
1515 | } | |
1516 | mld = (struct mld_msg *)skb_transport_header(skb2); | |
08b202b6 YH |
1517 | br_ip6_multicast_leave_group(br, port, &mld->mld_mca); |
1518 | } | |
1519 | } | |
1520 | ||
1521 | out: | |
9d89081d | 1522 | kfree_skb(skb2); |
08b202b6 YH |
1523 | return err; |
1524 | } | |
1525 | #endif | |
1526 | ||
eb1d1641 HX |
1527 | int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, |
1528 | struct sk_buff *skb) | |
1529 | { | |
1fafc7a9 YH |
1530 | BR_INPUT_SKB_CB(skb)->igmp = 0; |
1531 | BR_INPUT_SKB_CB(skb)->mrouters_only = 0; | |
1532 | ||
eb1d1641 HX |
1533 | if (br->multicast_disabled) |
1534 | return 0; | |
1535 | ||
1536 | switch (skb->protocol) { | |
1537 | case htons(ETH_P_IP): | |
1538 | return br_multicast_ipv4_rcv(br, port, skb); | |
dfd56b8b | 1539 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1540 | case htons(ETH_P_IPV6): |
1541 | return br_multicast_ipv6_rcv(br, port, skb); | |
1542 | #endif | |
eb1d1641 HX |
1543 | } |
1544 | ||
1545 | return 0; | |
1546 | } | |
1547 | ||
1548 | static void br_multicast_query_expired(unsigned long data) | |
1549 | { | |
1550 | struct net_bridge *br = (void *)data; | |
1551 | ||
1552 | spin_lock(&br->multicast_lock); | |
1553 | if (br->multicast_startup_queries_sent < | |
1554 | br->multicast_startup_query_count) | |
1555 | br->multicast_startup_queries_sent++; | |
1556 | ||
1557 | br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent); | |
1558 | ||
1559 | spin_unlock(&br->multicast_lock); | |
1560 | } | |
1561 | ||
1562 | void br_multicast_init(struct net_bridge *br) | |
1563 | { | |
1564 | br->hash_elasticity = 4; | |
1565 | br->hash_max = 512; | |
1566 | ||
1567 | br->multicast_router = 1; | |
c5c23260 | 1568 | br->multicast_querier = 0; |
eb1d1641 HX |
1569 | br->multicast_last_member_count = 2; |
1570 | br->multicast_startup_query_count = 2; | |
1571 | ||
1572 | br->multicast_last_member_interval = HZ; | |
1573 | br->multicast_query_response_interval = 10 * HZ; | |
1574 | br->multicast_startup_query_interval = 125 * HZ / 4; | |
1575 | br->multicast_query_interval = 125 * HZ; | |
1576 | br->multicast_querier_interval = 255 * HZ; | |
1577 | br->multicast_membership_interval = 260 * HZ; | |
1578 | ||
1579 | spin_lock_init(&br->multicast_lock); | |
1580 | setup_timer(&br->multicast_router_timer, | |
1581 | br_multicast_local_router_expired, 0); | |
1582 | setup_timer(&br->multicast_querier_timer, | |
bb63f1f8 | 1583 | br_multicast_querier_expired, (unsigned long)br); |
eb1d1641 HX |
1584 | setup_timer(&br->multicast_query_timer, br_multicast_query_expired, |
1585 | (unsigned long)br); | |
1586 | } | |
1587 | ||
1588 | void br_multicast_open(struct net_bridge *br) | |
1589 | { | |
1590 | br->multicast_startup_queries_sent = 0; | |
1591 | ||
1592 | if (br->multicast_disabled) | |
1593 | return; | |
1594 | ||
1595 | mod_timer(&br->multicast_query_timer, jiffies); | |
1596 | } | |
1597 | ||
1598 | void br_multicast_stop(struct net_bridge *br) | |
1599 | { | |
1600 | struct net_bridge_mdb_htable *mdb; | |
1601 | struct net_bridge_mdb_entry *mp; | |
1602 | struct hlist_node *p, *n; | |
1603 | u32 ver; | |
1604 | int i; | |
1605 | ||
1606 | del_timer_sync(&br->multicast_router_timer); | |
1607 | del_timer_sync(&br->multicast_querier_timer); | |
1608 | del_timer_sync(&br->multicast_query_timer); | |
1609 | ||
1610 | spin_lock_bh(&br->multicast_lock); | |
e8051688 | 1611 | mdb = mlock_dereference(br->mdb, br); |
eb1d1641 HX |
1612 | if (!mdb) |
1613 | goto out; | |
1614 | ||
1615 | br->mdb = NULL; | |
1616 | ||
1617 | ver = mdb->ver; | |
1618 | for (i = 0; i < mdb->max; i++) { | |
1619 | hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i], | |
1620 | hlist[ver]) { | |
1621 | del_timer(&mp->timer); | |
eb1d1641 HX |
1622 | call_rcu_bh(&mp->rcu, br_multicast_free_group); |
1623 | } | |
1624 | } | |
1625 | ||
1626 | if (mdb->old) { | |
1627 | spin_unlock_bh(&br->multicast_lock); | |
10cc2b50 | 1628 | rcu_barrier_bh(); |
eb1d1641 HX |
1629 | spin_lock_bh(&br->multicast_lock); |
1630 | WARN_ON(mdb->old); | |
1631 | } | |
1632 | ||
1633 | mdb->old = mdb; | |
1634 | call_rcu_bh(&mdb->rcu, br_mdb_free); | |
1635 | ||
1636 | out: | |
1637 | spin_unlock_bh(&br->multicast_lock); | |
1638 | } | |
0909e117 HX |
1639 | |
1640 | int br_multicast_set_router(struct net_bridge *br, unsigned long val) | |
1641 | { | |
1642 | int err = -ENOENT; | |
1643 | ||
1644 | spin_lock_bh(&br->multicast_lock); | |
1645 | if (!netif_running(br->dev)) | |
1646 | goto unlock; | |
1647 | ||
1648 | switch (val) { | |
1649 | case 0: | |
1650 | case 2: | |
1651 | del_timer(&br->multicast_router_timer); | |
1652 | /* fall through */ | |
1653 | case 1: | |
1654 | br->multicast_router = val; | |
1655 | err = 0; | |
1656 | break; | |
1657 | ||
1658 | default: | |
1659 | err = -EINVAL; | |
1660 | break; | |
1661 | } | |
1662 | ||
1663 | unlock: | |
1664 | spin_unlock_bh(&br->multicast_lock); | |
1665 | ||
1666 | return err; | |
1667 | } | |
1668 | ||
1669 | int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) | |
1670 | { | |
1671 | struct net_bridge *br = p->br; | |
1672 | int err = -ENOENT; | |
1673 | ||
1674 | spin_lock(&br->multicast_lock); | |
1675 | if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED) | |
1676 | goto unlock; | |
1677 | ||
1678 | switch (val) { | |
1679 | case 0: | |
1680 | case 1: | |
1681 | case 2: | |
1682 | p->multicast_router = val; | |
1683 | err = 0; | |
1684 | ||
1685 | if (val < 2 && !hlist_unhashed(&p->rlist)) | |
1686 | hlist_del_init_rcu(&p->rlist); | |
1687 | ||
1688 | if (val == 1) | |
1689 | break; | |
1690 | ||
1691 | del_timer(&p->multicast_router_timer); | |
1692 | ||
1693 | if (val == 0) | |
1694 | break; | |
1695 | ||
1696 | br_multicast_add_router(br, p); | |
1697 | break; | |
1698 | ||
1699 | default: | |
1700 | err = -EINVAL; | |
1701 | break; | |
1702 | } | |
1703 | ||
1704 | unlock: | |
1705 | spin_unlock(&br->multicast_lock); | |
1706 | ||
1707 | return err; | |
1708 | } | |
561f1103 | 1709 | |
74857216 | 1710 | static void br_multicast_start_querier(struct net_bridge *br) |
561f1103 HX |
1711 | { |
1712 | struct net_bridge_port *port; | |
74857216 HX |
1713 | |
1714 | br_multicast_open(br); | |
1715 | ||
1716 | list_for_each_entry(port, &br->port_list, list) { | |
1717 | if (port->state == BR_STATE_DISABLED || | |
1718 | port->state == BR_STATE_BLOCKING) | |
1719 | continue; | |
1720 | ||
1721 | __br_multicast_enable_port(port); | |
1722 | } | |
1723 | } | |
1724 | ||
1725 | int br_multicast_toggle(struct net_bridge *br, unsigned long val) | |
1726 | { | |
3a7fda06 | 1727 | int err = 0; |
e8051688 | 1728 | struct net_bridge_mdb_htable *mdb; |
561f1103 | 1729 | |
ef5e0d82 | 1730 | spin_lock_bh(&br->multicast_lock); |
561f1103 HX |
1731 | if (br->multicast_disabled == !val) |
1732 | goto unlock; | |
1733 | ||
1734 | br->multicast_disabled = !val; | |
1735 | if (br->multicast_disabled) | |
1736 | goto unlock; | |
1737 | ||
3a7fda06 HX |
1738 | if (!netif_running(br->dev)) |
1739 | goto unlock; | |
1740 | ||
e8051688 ED |
1741 | mdb = mlock_dereference(br->mdb, br); |
1742 | if (mdb) { | |
1743 | if (mdb->old) { | |
561f1103 HX |
1744 | err = -EEXIST; |
1745 | rollback: | |
1746 | br->multicast_disabled = !!val; | |
1747 | goto unlock; | |
1748 | } | |
1749 | ||
e8051688 | 1750 | err = br_mdb_rehash(&br->mdb, mdb->max, |
561f1103 HX |
1751 | br->hash_elasticity); |
1752 | if (err) | |
1753 | goto rollback; | |
1754 | } | |
1755 | ||
74857216 | 1756 | br_multicast_start_querier(br); |
561f1103 HX |
1757 | |
1758 | unlock: | |
ef5e0d82 | 1759 | spin_unlock_bh(&br->multicast_lock); |
561f1103 HX |
1760 | |
1761 | return err; | |
1762 | } | |
b195167f | 1763 | |
c5c23260 HX |
1764 | int br_multicast_set_querier(struct net_bridge *br, unsigned long val) |
1765 | { | |
1766 | val = !!val; | |
1767 | ||
1768 | spin_lock_bh(&br->multicast_lock); | |
1769 | if (br->multicast_querier == val) | |
1770 | goto unlock; | |
1771 | ||
1772 | br->multicast_querier = val; | |
1773 | if (val) | |
1774 | br_multicast_start_querier(br); | |
1775 | ||
1776 | unlock: | |
1777 | spin_unlock_bh(&br->multicast_lock); | |
1778 | ||
1779 | return 0; | |
1780 | } | |
1781 | ||
b195167f HX |
1782 | int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) |
1783 | { | |
1784 | int err = -ENOENT; | |
1785 | u32 old; | |
e8051688 | 1786 | struct net_bridge_mdb_htable *mdb; |
b195167f HX |
1787 | |
1788 | spin_lock(&br->multicast_lock); | |
1789 | if (!netif_running(br->dev)) | |
1790 | goto unlock; | |
1791 | ||
1792 | err = -EINVAL; | |
1793 | if (!is_power_of_2(val)) | |
1794 | goto unlock; | |
e8051688 ED |
1795 | |
1796 | mdb = mlock_dereference(br->mdb, br); | |
1797 | if (mdb && val < mdb->size) | |
b195167f HX |
1798 | goto unlock; |
1799 | ||
1800 | err = 0; | |
1801 | ||
1802 | old = br->hash_max; | |
1803 | br->hash_max = val; | |
1804 | ||
e8051688 ED |
1805 | if (mdb) { |
1806 | if (mdb->old) { | |
b195167f HX |
1807 | err = -EEXIST; |
1808 | rollback: | |
1809 | br->hash_max = old; | |
1810 | goto unlock; | |
1811 | } | |
1812 | ||
1813 | err = br_mdb_rehash(&br->mdb, br->hash_max, | |
1814 | br->hash_elasticity); | |
1815 | if (err) | |
1816 | goto rollback; | |
1817 | } | |
1818 | ||
1819 | unlock: | |
1820 | spin_unlock(&br->multicast_lock); | |
1821 | ||
1822 | return err; | |
1823 | } |