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> | |
d4c4f07d | 30 | #include <net/ip6_checksum.h> |
08b202b6 | 31 | #endif |
eb1d1641 HX |
32 | |
33 | #include "br_private.h" | |
34 | ||
c83b8fab | 35 | static void br_multicast_start_querier(struct net_bridge *br); |
2ce297fc | 36 | unsigned int br_mdb_rehash_seq; |
c83b8fab | 37 | |
8ef2a9a5 YH |
38 | static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b) |
39 | { | |
40 | if (a->proto != b->proto) | |
41 | return 0; | |
42 | switch (a->proto) { | |
43 | case htons(ETH_P_IP): | |
44 | return a->u.ip4 == b->u.ip4; | |
dfd56b8b | 45 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
46 | case htons(ETH_P_IPV6): |
47 | return ipv6_addr_equal(&a->u.ip6, &b->u.ip6); | |
48 | #endif | |
8ef2a9a5 YH |
49 | } |
50 | return 0; | |
51 | } | |
52 | ||
53 | static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip) | |
eb1d1641 | 54 | { |
0eae88f3 | 55 | return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1); |
eb1d1641 HX |
56 | } |
57 | ||
dfd56b8b | 58 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
59 | static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb, |
60 | const struct in6_addr *ip) | |
61 | { | |
62 | return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1); | |
63 | } | |
64 | #endif | |
65 | ||
8ef2a9a5 YH |
66 | static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb, |
67 | struct br_ip *ip) | |
68 | { | |
69 | switch (ip->proto) { | |
70 | case htons(ETH_P_IP): | |
71 | return __br_ip4_hash(mdb, ip->u.ip4); | |
dfd56b8b | 72 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
73 | case htons(ETH_P_IPV6): |
74 | return __br_ip6_hash(mdb, &ip->u.ip6); | |
75 | #endif | |
8ef2a9a5 YH |
76 | } |
77 | return 0; | |
eb1d1641 HX |
78 | } |
79 | ||
80 | static struct net_bridge_mdb_entry *__br_mdb_ip_get( | |
8ef2a9a5 | 81 | struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash) |
eb1d1641 HX |
82 | { |
83 | struct net_bridge_mdb_entry *mp; | |
84 | struct hlist_node *p; | |
85 | ||
49f5fcfd | 86 | hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) { |
8ef2a9a5 | 87 | if (br_ip_equal(&mp->addr, dst)) |
eb1d1641 HX |
88 | return mp; |
89 | } | |
90 | ||
91 | return NULL; | |
92 | } | |
93 | ||
cfd56754 CW |
94 | struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, |
95 | struct br_ip *dst) | |
7f285fa7 HX |
96 | { |
97 | if (!mdb) | |
98 | return NULL; | |
99 | ||
100 | return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst)); | |
101 | } | |
102 | ||
8ef2a9a5 | 103 | static struct net_bridge_mdb_entry *br_mdb_ip4_get( |
eb1d1641 HX |
104 | struct net_bridge_mdb_htable *mdb, __be32 dst) |
105 | { | |
8ef2a9a5 YH |
106 | struct br_ip br_dst; |
107 | ||
108 | br_dst.u.ip4 = dst; | |
109 | br_dst.proto = htons(ETH_P_IP); | |
0821ec55 | 110 | |
7f285fa7 | 111 | return br_mdb_ip_get(mdb, &br_dst); |
8ef2a9a5 YH |
112 | } |
113 | ||
dfd56b8b | 114 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
115 | static struct net_bridge_mdb_entry *br_mdb_ip6_get( |
116 | struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst) | |
117 | { | |
118 | struct br_ip br_dst; | |
0821ec55 | 119 | |
4e3fd7a0 | 120 | br_dst.u.ip6 = *dst; |
08b202b6 YH |
121 | br_dst.proto = htons(ETH_P_IPV6); |
122 | ||
7f285fa7 | 123 | return br_mdb_ip_get(mdb, &br_dst); |
08b202b6 YH |
124 | } |
125 | #endif | |
126 | ||
eb1d1641 HX |
127 | struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, |
128 | struct sk_buff *skb) | |
129 | { | |
e8051688 | 130 | struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb); |
8ef2a9a5 YH |
131 | struct br_ip ip; |
132 | ||
7f285fa7 | 133 | if (br->multicast_disabled) |
eb1d1641 HX |
134 | return NULL; |
135 | ||
8ef2a9a5 | 136 | if (BR_INPUT_SKB_CB(skb)->igmp) |
eb1d1641 HX |
137 | return NULL; |
138 | ||
8ef2a9a5 YH |
139 | ip.proto = skb->protocol; |
140 | ||
eb1d1641 HX |
141 | switch (skb->protocol) { |
142 | case htons(ETH_P_IP): | |
8ef2a9a5 YH |
143 | ip.u.ip4 = ip_hdr(skb)->daddr; |
144 | break; | |
dfd56b8b | 145 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 146 | case htons(ETH_P_IPV6): |
4e3fd7a0 | 147 | ip.u.ip6 = ipv6_hdr(skb)->daddr; |
08b202b6 YH |
148 | break; |
149 | #endif | |
8ef2a9a5 YH |
150 | default: |
151 | return NULL; | |
eb1d1641 HX |
152 | } |
153 | ||
8ef2a9a5 | 154 | return br_mdb_ip_get(mdb, &ip); |
eb1d1641 HX |
155 | } |
156 | ||
157 | static void br_mdb_free(struct rcu_head *head) | |
158 | { | |
159 | struct net_bridge_mdb_htable *mdb = | |
160 | container_of(head, struct net_bridge_mdb_htable, rcu); | |
161 | struct net_bridge_mdb_htable *old = mdb->old; | |
162 | ||
163 | mdb->old = NULL; | |
164 | kfree(old->mhash); | |
165 | kfree(old); | |
166 | } | |
167 | ||
168 | static int br_mdb_copy(struct net_bridge_mdb_htable *new, | |
169 | struct net_bridge_mdb_htable *old, | |
170 | int elasticity) | |
171 | { | |
172 | struct net_bridge_mdb_entry *mp; | |
173 | struct hlist_node *p; | |
174 | int maxlen; | |
175 | int len; | |
176 | int i; | |
177 | ||
178 | for (i = 0; i < old->max; i++) | |
179 | hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver]) | |
180 | hlist_add_head(&mp->hlist[new->ver], | |
8ef2a9a5 | 181 | &new->mhash[br_ip_hash(new, &mp->addr)]); |
eb1d1641 HX |
182 | |
183 | if (!elasticity) | |
184 | return 0; | |
185 | ||
186 | maxlen = 0; | |
187 | for (i = 0; i < new->max; i++) { | |
188 | len = 0; | |
189 | hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver]) | |
190 | len++; | |
191 | if (len > maxlen) | |
192 | maxlen = len; | |
193 | } | |
194 | ||
195 | return maxlen > elasticity ? -EINVAL : 0; | |
196 | } | |
197 | ||
cfd56754 | 198 | void br_multicast_free_pg(struct rcu_head *head) |
eb1d1641 HX |
199 | { |
200 | struct net_bridge_port_group *p = | |
201 | container_of(head, struct net_bridge_port_group, rcu); | |
202 | ||
203 | kfree(p); | |
204 | } | |
205 | ||
206 | static void br_multicast_free_group(struct rcu_head *head) | |
207 | { | |
208 | struct net_bridge_mdb_entry *mp = | |
209 | container_of(head, struct net_bridge_mdb_entry, rcu); | |
210 | ||
211 | kfree(mp); | |
212 | } | |
213 | ||
214 | static void br_multicast_group_expired(unsigned long data) | |
215 | { | |
216 | struct net_bridge_mdb_entry *mp = (void *)data; | |
217 | struct net_bridge *br = mp->br; | |
218 | struct net_bridge_mdb_htable *mdb; | |
219 | ||
220 | spin_lock(&br->multicast_lock); | |
221 | if (!netif_running(br->dev) || timer_pending(&mp->timer)) | |
222 | goto out; | |
223 | ||
8a870178 | 224 | mp->mglist = false; |
eb1d1641 HX |
225 | |
226 | if (mp->ports) | |
227 | goto out; | |
228 | ||
e8051688 ED |
229 | mdb = mlock_dereference(br->mdb, br); |
230 | ||
eb1d1641 HX |
231 | hlist_del_rcu(&mp->hlist[mdb->ver]); |
232 | mdb->size--; | |
233 | ||
eb1d1641 HX |
234 | call_rcu_bh(&mp->rcu, br_multicast_free_group); |
235 | ||
236 | out: | |
237 | spin_unlock(&br->multicast_lock); | |
238 | } | |
239 | ||
240 | static void br_multicast_del_pg(struct net_bridge *br, | |
241 | struct net_bridge_port_group *pg) | |
242 | { | |
e8051688 | 243 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 HX |
244 | struct net_bridge_mdb_entry *mp; |
245 | struct net_bridge_port_group *p; | |
e8051688 ED |
246 | struct net_bridge_port_group __rcu **pp; |
247 | ||
248 | mdb = mlock_dereference(br->mdb, br); | |
eb1d1641 | 249 | |
8ef2a9a5 | 250 | mp = br_mdb_ip_get(mdb, &pg->addr); |
eb1d1641 HX |
251 | if (WARN_ON(!mp)) |
252 | return; | |
253 | ||
e8051688 ED |
254 | for (pp = &mp->ports; |
255 | (p = mlock_dereference(*pp, br)) != NULL; | |
256 | pp = &p->next) { | |
eb1d1641 HX |
257 | if (p != pg) |
258 | continue; | |
259 | ||
83f6a740 | 260 | rcu_assign_pointer(*pp, p->next); |
eb1d1641 HX |
261 | hlist_del_init(&p->mglist); |
262 | del_timer(&p->timer); | |
eb1d1641 HX |
263 | call_rcu_bh(&p->rcu, br_multicast_free_pg); |
264 | ||
8a870178 | 265 | if (!mp->ports && !mp->mglist && |
eb1d1641 HX |
266 | netif_running(br->dev)) |
267 | mod_timer(&mp->timer, jiffies); | |
268 | ||
269 | return; | |
270 | } | |
271 | ||
272 | WARN_ON(1); | |
273 | } | |
274 | ||
275 | static void br_multicast_port_group_expired(unsigned long data) | |
276 | { | |
277 | struct net_bridge_port_group *pg = (void *)data; | |
278 | struct net_bridge *br = pg->port->br; | |
279 | ||
280 | spin_lock(&br->multicast_lock); | |
281 | if (!netif_running(br->dev) || timer_pending(&pg->timer) || | |
282 | hlist_unhashed(&pg->mglist)) | |
283 | goto out; | |
284 | ||
285 | br_multicast_del_pg(br, pg); | |
286 | ||
287 | out: | |
288 | spin_unlock(&br->multicast_lock); | |
289 | } | |
290 | ||
e8051688 | 291 | static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max, |
eb1d1641 HX |
292 | int elasticity) |
293 | { | |
e8051688 | 294 | struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1); |
eb1d1641 HX |
295 | struct net_bridge_mdb_htable *mdb; |
296 | int err; | |
297 | ||
298 | mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC); | |
299 | if (!mdb) | |
300 | return -ENOMEM; | |
301 | ||
302 | mdb->max = max; | |
303 | mdb->old = old; | |
304 | ||
305 | mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC); | |
306 | if (!mdb->mhash) { | |
307 | kfree(mdb); | |
308 | return -ENOMEM; | |
309 | } | |
310 | ||
311 | mdb->size = old ? old->size : 0; | |
312 | mdb->ver = old ? old->ver ^ 1 : 0; | |
313 | ||
314 | if (!old || elasticity) | |
315 | get_random_bytes(&mdb->secret, sizeof(mdb->secret)); | |
316 | else | |
317 | mdb->secret = old->secret; | |
318 | ||
319 | if (!old) | |
320 | goto out; | |
321 | ||
322 | err = br_mdb_copy(mdb, old, elasticity); | |
323 | if (err) { | |
324 | kfree(mdb->mhash); | |
325 | kfree(mdb); | |
326 | return err; | |
327 | } | |
328 | ||
2ce297fc | 329 | br_mdb_rehash_seq++; |
eb1d1641 HX |
330 | call_rcu_bh(&mdb->rcu, br_mdb_free); |
331 | ||
332 | out: | |
333 | rcu_assign_pointer(*mdbp, mdb); | |
334 | ||
335 | return 0; | |
336 | } | |
337 | ||
8ef2a9a5 YH |
338 | static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br, |
339 | __be32 group) | |
eb1d1641 HX |
340 | { |
341 | struct sk_buff *skb; | |
342 | struct igmphdr *ih; | |
343 | struct ethhdr *eth; | |
344 | struct iphdr *iph; | |
345 | ||
346 | skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) + | |
347 | sizeof(*ih) + 4); | |
348 | if (!skb) | |
349 | goto out; | |
350 | ||
351 | skb->protocol = htons(ETH_P_IP); | |
352 | ||
353 | skb_reset_mac_header(skb); | |
354 | eth = eth_hdr(skb); | |
355 | ||
356 | memcpy(eth->h_source, br->dev->dev_addr, 6); | |
357 | eth->h_dest[0] = 1; | |
358 | eth->h_dest[1] = 0; | |
359 | eth->h_dest[2] = 0x5e; | |
360 | eth->h_dest[3] = 0; | |
361 | eth->h_dest[4] = 0; | |
362 | eth->h_dest[5] = 1; | |
363 | eth->h_proto = htons(ETH_P_IP); | |
364 | skb_put(skb, sizeof(*eth)); | |
365 | ||
366 | skb_set_network_header(skb, skb->len); | |
367 | iph = ip_hdr(skb); | |
368 | ||
369 | iph->version = 4; | |
370 | iph->ihl = 6; | |
371 | iph->tos = 0xc0; | |
372 | iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4); | |
373 | iph->id = 0; | |
374 | iph->frag_off = htons(IP_DF); | |
375 | iph->ttl = 1; | |
376 | iph->protocol = IPPROTO_IGMP; | |
377 | iph->saddr = 0; | |
378 | iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); | |
379 | ((u8 *)&iph[1])[0] = IPOPT_RA; | |
380 | ((u8 *)&iph[1])[1] = 4; | |
381 | ((u8 *)&iph[1])[2] = 0; | |
382 | ((u8 *)&iph[1])[3] = 0; | |
383 | ip_send_check(iph); | |
384 | skb_put(skb, 24); | |
385 | ||
386 | skb_set_transport_header(skb, skb->len); | |
387 | ih = igmp_hdr(skb); | |
388 | ih->type = IGMP_HOST_MEMBERSHIP_QUERY; | |
389 | ih->code = (group ? br->multicast_last_member_interval : | |
390 | br->multicast_query_response_interval) / | |
391 | (HZ / IGMP_TIMER_SCALE); | |
392 | ih->group = group; | |
393 | ih->csum = 0; | |
394 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
395 | skb_put(skb, sizeof(*ih)); | |
396 | ||
397 | __skb_pull(skb, sizeof(*eth)); | |
398 | ||
399 | out: | |
400 | return skb; | |
401 | } | |
402 | ||
dfd56b8b | 403 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 404 | static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, |
b71d1d42 | 405 | const struct in6_addr *group) |
08b202b6 YH |
406 | { |
407 | struct sk_buff *skb; | |
408 | struct ipv6hdr *ip6h; | |
409 | struct mld_msg *mldq; | |
410 | struct ethhdr *eth; | |
411 | u8 *hopopt; | |
412 | unsigned long interval; | |
413 | ||
414 | skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) + | |
415 | 8 + sizeof(*mldq)); | |
416 | if (!skb) | |
417 | goto out; | |
418 | ||
419 | skb->protocol = htons(ETH_P_IPV6); | |
420 | ||
421 | /* Ethernet header */ | |
422 | skb_reset_mac_header(skb); | |
423 | eth = eth_hdr(skb); | |
424 | ||
425 | memcpy(eth->h_source, br->dev->dev_addr, 6); | |
08b202b6 YH |
426 | eth->h_proto = htons(ETH_P_IPV6); |
427 | skb_put(skb, sizeof(*eth)); | |
428 | ||
429 | /* IPv6 header + HbH option */ | |
430 | skb_set_network_header(skb, skb->len); | |
431 | ip6h = ipv6_hdr(skb); | |
432 | ||
433 | *(__force __be32 *)ip6h = htonl(0x60000000); | |
76d66158 | 434 | ip6h->payload_len = htons(8 + sizeof(*mldq)); |
08b202b6 YH |
435 | ip6h->nexthdr = IPPROTO_HOPOPTS; |
436 | ip6h->hop_limit = 1; | |
a7bff75b | 437 | ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1)); |
d1d81d4c UW |
438 | if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0, |
439 | &ip6h->saddr)) { | |
440 | kfree_skb(skb); | |
441 | return NULL; | |
442 | } | |
36cff5a1 | 443 | ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); |
08b202b6 YH |
444 | |
445 | hopopt = (u8 *)(ip6h + 1); | |
446 | hopopt[0] = IPPROTO_ICMPV6; /* next hdr */ | |
447 | hopopt[1] = 0; /* length of HbH */ | |
448 | hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */ | |
449 | hopopt[3] = 2; /* Length of RA Option */ | |
450 | hopopt[4] = 0; /* Type = 0x0000 (MLD) */ | |
451 | hopopt[5] = 0; | |
1de5a71c EZ |
452 | hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */ |
453 | hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */ | |
08b202b6 YH |
454 | |
455 | skb_put(skb, sizeof(*ip6h) + 8); | |
456 | ||
457 | /* ICMPv6 */ | |
458 | skb_set_transport_header(skb, skb->len); | |
459 | mldq = (struct mld_msg *) icmp6_hdr(skb); | |
460 | ||
461 | interval = ipv6_addr_any(group) ? br->multicast_last_member_interval : | |
462 | br->multicast_query_response_interval; | |
463 | ||
464 | mldq->mld_type = ICMPV6_MGM_QUERY; | |
465 | mldq->mld_code = 0; | |
466 | mldq->mld_cksum = 0; | |
467 | mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); | |
468 | mldq->mld_reserved = 0; | |
4e3fd7a0 | 469 | mldq->mld_mca = *group; |
08b202b6 YH |
470 | |
471 | /* checksum */ | |
472 | mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
473 | sizeof(*mldq), IPPROTO_ICMPV6, | |
474 | csum_partial(mldq, | |
475 | sizeof(*mldq), 0)); | |
476 | skb_put(skb, sizeof(*mldq)); | |
477 | ||
478 | __skb_pull(skb, sizeof(*eth)); | |
479 | ||
480 | out: | |
481 | return skb; | |
482 | } | |
483 | #endif | |
484 | ||
8ef2a9a5 YH |
485 | static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, |
486 | struct br_ip *addr) | |
487 | { | |
488 | switch (addr->proto) { | |
489 | case htons(ETH_P_IP): | |
490 | return br_ip4_multicast_alloc_query(br, addr->u.ip4); | |
dfd56b8b | 491 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
492 | case htons(ETH_P_IPV6): |
493 | return br_ip6_multicast_alloc_query(br, &addr->u.ip6); | |
494 | #endif | |
8ef2a9a5 YH |
495 | } |
496 | return NULL; | |
497 | } | |
498 | ||
eb1d1641 | 499 | static struct net_bridge_mdb_entry *br_multicast_get_group( |
8ef2a9a5 YH |
500 | struct net_bridge *br, struct net_bridge_port *port, |
501 | struct br_ip *group, int hash) | |
eb1d1641 | 502 | { |
e8051688 | 503 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 HX |
504 | struct net_bridge_mdb_entry *mp; |
505 | struct hlist_node *p; | |
95c96174 ED |
506 | unsigned int count = 0; |
507 | unsigned int max; | |
eb1d1641 HX |
508 | int elasticity; |
509 | int err; | |
510 | ||
e8051688 | 511 | mdb = rcu_dereference_protected(br->mdb, 1); |
eb1d1641 HX |
512 | hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) { |
513 | count++; | |
8ef2a9a5 | 514 | if (unlikely(br_ip_equal(group, &mp->addr))) |
eb1d1641 | 515 | return mp; |
eb1d1641 HX |
516 | } |
517 | ||
518 | elasticity = 0; | |
519 | max = mdb->max; | |
520 | ||
521 | if (unlikely(count > br->hash_elasticity && count)) { | |
522 | if (net_ratelimit()) | |
28a16c97 | 523 | br_info(br, "Multicast hash table " |
524 | "chain limit reached: %s\n", | |
525 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
526 | |
527 | elasticity = br->hash_elasticity; | |
528 | } | |
529 | ||
530 | if (mdb->size >= max) { | |
531 | max *= 2; | |
036be6db TG |
532 | if (unlikely(max > br->hash_max)) { |
533 | br_warn(br, "Multicast hash table maximum of %d " | |
534 | "reached, disabling snooping: %s\n", | |
535 | br->hash_max, | |
536 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
537 | err = -E2BIG; |
538 | disable: | |
539 | br->multicast_disabled = 1; | |
540 | goto err; | |
541 | } | |
542 | } | |
543 | ||
544 | if (max > mdb->max || elasticity) { | |
545 | if (mdb->old) { | |
546 | if (net_ratelimit()) | |
28a16c97 | 547 | br_info(br, "Multicast hash table " |
548 | "on fire: %s\n", | |
549 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
550 | err = -EEXIST; |
551 | goto err; | |
552 | } | |
553 | ||
554 | err = br_mdb_rehash(&br->mdb, max, elasticity); | |
555 | if (err) { | |
28a16c97 | 556 | br_warn(br, "Cannot rehash multicast " |
557 | "hash table, disabling snooping: %s, %d, %d\n", | |
558 | port ? port->dev->name : br->dev->name, | |
559 | mdb->size, err); | |
eb1d1641 HX |
560 | goto disable; |
561 | } | |
562 | ||
563 | err = -EAGAIN; | |
564 | goto err; | |
565 | } | |
566 | ||
567 | return NULL; | |
568 | ||
569 | err: | |
570 | mp = ERR_PTR(err); | |
571 | return mp; | |
572 | } | |
573 | ||
cfd56754 CW |
574 | struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br, |
575 | struct net_bridge_port *port, struct br_ip *group) | |
eb1d1641 | 576 | { |
e8051688 | 577 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 HX |
578 | struct net_bridge_mdb_entry *mp; |
579 | int hash; | |
4c0833bc | 580 | int err; |
eb1d1641 | 581 | |
e8051688 | 582 | mdb = rcu_dereference_protected(br->mdb, 1); |
eb1d1641 | 583 | if (!mdb) { |
4c0833bc TK |
584 | err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0); |
585 | if (err) | |
586 | return ERR_PTR(err); | |
eb1d1641 HX |
587 | goto rehash; |
588 | } | |
589 | ||
590 | hash = br_ip_hash(mdb, group); | |
591 | mp = br_multicast_get_group(br, port, group, hash); | |
592 | switch (PTR_ERR(mp)) { | |
593 | case 0: | |
594 | break; | |
595 | ||
596 | case -EAGAIN: | |
597 | rehash: | |
e8051688 | 598 | mdb = rcu_dereference_protected(br->mdb, 1); |
eb1d1641 HX |
599 | hash = br_ip_hash(mdb, group); |
600 | break; | |
601 | ||
602 | default: | |
603 | goto out; | |
604 | } | |
605 | ||
606 | mp = kzalloc(sizeof(*mp), GFP_ATOMIC); | |
607 | if (unlikely(!mp)) | |
4c0833bc | 608 | return ERR_PTR(-ENOMEM); |
eb1d1641 HX |
609 | |
610 | mp->br = br; | |
8ef2a9a5 | 611 | mp->addr = *group; |
eb1d1641 HX |
612 | setup_timer(&mp->timer, br_multicast_group_expired, |
613 | (unsigned long)mp); | |
eb1d1641 HX |
614 | |
615 | hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]); | |
616 | mdb->size++; | |
617 | ||
618 | out: | |
619 | return mp; | |
620 | } | |
621 | ||
cfd56754 CW |
622 | struct net_bridge_port_group *br_multicast_new_port_group( |
623 | struct net_bridge_port *port, | |
624 | struct br_ip *group, | |
eca2a43b | 625 | struct net_bridge_port_group __rcu *next) |
cfd56754 CW |
626 | { |
627 | struct net_bridge_port_group *p; | |
628 | ||
629 | p = kzalloc(sizeof(*p), GFP_ATOMIC); | |
630 | if (unlikely(!p)) | |
631 | return NULL; | |
632 | ||
633 | p->addr = *group; | |
634 | p->port = port; | |
eca2a43b | 635 | rcu_assign_pointer(p->next, next); |
cfd56754 CW |
636 | hlist_add_head(&p->mglist, &port->mglist); |
637 | setup_timer(&p->timer, br_multicast_port_group_expired, | |
638 | (unsigned long)p); | |
639 | return p; | |
640 | } | |
641 | ||
eb1d1641 | 642 | static int br_multicast_add_group(struct net_bridge *br, |
8ef2a9a5 YH |
643 | struct net_bridge_port *port, |
644 | struct br_ip *group) | |
eb1d1641 HX |
645 | { |
646 | struct net_bridge_mdb_entry *mp; | |
647 | struct net_bridge_port_group *p; | |
e8051688 | 648 | struct net_bridge_port_group __rcu **pp; |
eb1d1641 HX |
649 | unsigned long now = jiffies; |
650 | int err; | |
651 | ||
eb1d1641 HX |
652 | spin_lock(&br->multicast_lock); |
653 | if (!netif_running(br->dev) || | |
654 | (port && port->state == BR_STATE_DISABLED)) | |
655 | goto out; | |
656 | ||
657 | mp = br_multicast_new_group(br, port, group); | |
658 | err = PTR_ERR(mp); | |
4c0833bc | 659 | if (IS_ERR(mp)) |
eb1d1641 HX |
660 | goto err; |
661 | ||
662 | if (!port) { | |
8a870178 | 663 | mp->mglist = true; |
eb1d1641 HX |
664 | mod_timer(&mp->timer, now + br->multicast_membership_interval); |
665 | goto out; | |
666 | } | |
667 | ||
e8051688 ED |
668 | for (pp = &mp->ports; |
669 | (p = mlock_dereference(*pp, br)) != NULL; | |
670 | pp = &p->next) { | |
eb1d1641 HX |
671 | if (p->port == port) |
672 | goto found; | |
673 | if ((unsigned long)p->port < (unsigned long)port) | |
674 | break; | |
675 | } | |
676 | ||
cfd56754 | 677 | p = br_multicast_new_port_group(port, group, *pp); |
eb1d1641 HX |
678 | if (unlikely(!p)) |
679 | goto err; | |
eb1d1641 | 680 | rcu_assign_pointer(*pp, p); |
37a393bc | 681 | br_mdb_notify(br->dev, port, group, RTM_NEWMDB); |
eb1d1641 HX |
682 | |
683 | found: | |
684 | mod_timer(&p->timer, now + br->multicast_membership_interval); | |
685 | out: | |
686 | err = 0; | |
687 | ||
688 | err: | |
689 | spin_unlock(&br->multicast_lock); | |
690 | return err; | |
691 | } | |
692 | ||
8ef2a9a5 YH |
693 | static int br_ip4_multicast_add_group(struct net_bridge *br, |
694 | struct net_bridge_port *port, | |
695 | __be32 group) | |
696 | { | |
697 | struct br_ip br_group; | |
698 | ||
699 | if (ipv4_is_local_multicast(group)) | |
700 | return 0; | |
701 | ||
702 | br_group.u.ip4 = group; | |
703 | br_group.proto = htons(ETH_P_IP); | |
704 | ||
705 | return br_multicast_add_group(br, port, &br_group); | |
706 | } | |
707 | ||
dfd56b8b | 708 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
709 | static int br_ip6_multicast_add_group(struct net_bridge *br, |
710 | struct net_bridge_port *port, | |
711 | const struct in6_addr *group) | |
712 | { | |
713 | struct br_ip br_group; | |
714 | ||
e4de9f9e | 715 | if (!ipv6_is_transient_multicast(group)) |
08b202b6 YH |
716 | return 0; |
717 | ||
4e3fd7a0 | 718 | br_group.u.ip6 = *group; |
9cc6e0c4 | 719 | br_group.proto = htons(ETH_P_IPV6); |
08b202b6 YH |
720 | |
721 | return br_multicast_add_group(br, port, &br_group); | |
722 | } | |
723 | #endif | |
724 | ||
eb1d1641 HX |
725 | static void br_multicast_router_expired(unsigned long data) |
726 | { | |
727 | struct net_bridge_port *port = (void *)data; | |
728 | struct net_bridge *br = port->br; | |
729 | ||
730 | spin_lock(&br->multicast_lock); | |
731 | if (port->multicast_router != 1 || | |
732 | timer_pending(&port->multicast_router_timer) || | |
733 | hlist_unhashed(&port->rlist)) | |
734 | goto out; | |
735 | ||
736 | hlist_del_init_rcu(&port->rlist); | |
737 | ||
738 | out: | |
739 | spin_unlock(&br->multicast_lock); | |
740 | } | |
741 | ||
742 | static void br_multicast_local_router_expired(unsigned long data) | |
743 | { | |
744 | } | |
745 | ||
c83b8fab HX |
746 | static void br_multicast_querier_expired(unsigned long data) |
747 | { | |
bb63f1f8 | 748 | struct net_bridge *br = (void *)data; |
c83b8fab HX |
749 | |
750 | spin_lock(&br->multicast_lock); | |
751 | if (!netif_running(br->dev) || br->multicast_disabled) | |
752 | goto out; | |
753 | ||
754 | br_multicast_start_querier(br); | |
755 | ||
756 | out: | |
757 | spin_unlock(&br->multicast_lock); | |
758 | } | |
759 | ||
8ef2a9a5 YH |
760 | static void __br_multicast_send_query(struct net_bridge *br, |
761 | struct net_bridge_port *port, | |
762 | struct br_ip *ip) | |
eb1d1641 | 763 | { |
eb1d1641 HX |
764 | struct sk_buff *skb; |
765 | ||
8ef2a9a5 | 766 | skb = br_multicast_alloc_query(br, ip); |
eb1d1641 | 767 | if (!skb) |
8ef2a9a5 | 768 | return; |
eb1d1641 HX |
769 | |
770 | if (port) { | |
771 | __skb_push(skb, sizeof(struct ethhdr)); | |
772 | skb->dev = port->dev; | |
713aefa3 | 773 | NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, |
eb1d1641 HX |
774 | dev_queue_xmit); |
775 | } else | |
776 | netif_rx(skb); | |
8ef2a9a5 YH |
777 | } |
778 | ||
779 | static void br_multicast_send_query(struct net_bridge *br, | |
780 | struct net_bridge_port *port, u32 sent) | |
781 | { | |
782 | unsigned long time; | |
783 | struct br_ip br_group; | |
784 | ||
785 | if (!netif_running(br->dev) || br->multicast_disabled || | |
c5c23260 | 786 | !br->multicast_querier || |
8ef2a9a5 YH |
787 | timer_pending(&br->multicast_querier_timer)) |
788 | return; | |
789 | ||
08b202b6 YH |
790 | memset(&br_group.u, 0, sizeof(br_group.u)); |
791 | ||
8ef2a9a5 | 792 | br_group.proto = htons(ETH_P_IP); |
08b202b6 | 793 | __br_multicast_send_query(br, port, &br_group); |
8ef2a9a5 | 794 | |
dfd56b8b | 795 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 796 | br_group.proto = htons(ETH_P_IPV6); |
8ef2a9a5 | 797 | __br_multicast_send_query(br, port, &br_group); |
08b202b6 | 798 | #endif |
eb1d1641 | 799 | |
eb1d1641 HX |
800 | time = jiffies; |
801 | time += sent < br->multicast_startup_query_count ? | |
802 | br->multicast_startup_query_interval : | |
803 | br->multicast_query_interval; | |
804 | mod_timer(port ? &port->multicast_query_timer : | |
805 | &br->multicast_query_timer, time); | |
806 | } | |
807 | ||
808 | static void br_multicast_port_query_expired(unsigned long data) | |
809 | { | |
810 | struct net_bridge_port *port = (void *)data; | |
811 | struct net_bridge *br = port->br; | |
812 | ||
813 | spin_lock(&br->multicast_lock); | |
02a780c0 DC |
814 | if (port->state == BR_STATE_DISABLED || |
815 | port->state == BR_STATE_BLOCKING) | |
eb1d1641 HX |
816 | goto out; |
817 | ||
818 | if (port->multicast_startup_queries_sent < | |
819 | br->multicast_startup_query_count) | |
820 | port->multicast_startup_queries_sent++; | |
821 | ||
822 | br_multicast_send_query(port->br, port, | |
823 | port->multicast_startup_queries_sent); | |
824 | ||
825 | out: | |
826 | spin_unlock(&br->multicast_lock); | |
827 | } | |
828 | ||
829 | void br_multicast_add_port(struct net_bridge_port *port) | |
830 | { | |
831 | port->multicast_router = 1; | |
832 | ||
833 | setup_timer(&port->multicast_router_timer, br_multicast_router_expired, | |
834 | (unsigned long)port); | |
835 | setup_timer(&port->multicast_query_timer, | |
836 | br_multicast_port_query_expired, (unsigned long)port); | |
837 | } | |
838 | ||
839 | void br_multicast_del_port(struct net_bridge_port *port) | |
840 | { | |
841 | del_timer_sync(&port->multicast_router_timer); | |
842 | } | |
843 | ||
561f1103 HX |
844 | static void __br_multicast_enable_port(struct net_bridge_port *port) |
845 | { | |
846 | port->multicast_startup_queries_sent = 0; | |
847 | ||
848 | if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 || | |
849 | del_timer(&port->multicast_query_timer)) | |
850 | mod_timer(&port->multicast_query_timer, jiffies); | |
851 | } | |
852 | ||
eb1d1641 HX |
853 | void br_multicast_enable_port(struct net_bridge_port *port) |
854 | { | |
855 | struct net_bridge *br = port->br; | |
856 | ||
857 | spin_lock(&br->multicast_lock); | |
858 | if (br->multicast_disabled || !netif_running(br->dev)) | |
859 | goto out; | |
860 | ||
561f1103 | 861 | __br_multicast_enable_port(port); |
eb1d1641 HX |
862 | |
863 | out: | |
864 | spin_unlock(&br->multicast_lock); | |
865 | } | |
866 | ||
867 | void br_multicast_disable_port(struct net_bridge_port *port) | |
868 | { | |
869 | struct net_bridge *br = port->br; | |
870 | struct net_bridge_port_group *pg; | |
871 | struct hlist_node *p, *n; | |
872 | ||
873 | spin_lock(&br->multicast_lock); | |
874 | hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist) | |
875 | br_multicast_del_pg(br, pg); | |
876 | ||
877 | if (!hlist_unhashed(&port->rlist)) | |
878 | hlist_del_init_rcu(&port->rlist); | |
879 | del_timer(&port->multicast_router_timer); | |
880 | del_timer(&port->multicast_query_timer); | |
881 | spin_unlock(&br->multicast_lock); | |
882 | } | |
883 | ||
8ef2a9a5 YH |
884 | static int br_ip4_multicast_igmp3_report(struct net_bridge *br, |
885 | struct net_bridge_port *port, | |
886 | struct sk_buff *skb) | |
eb1d1641 HX |
887 | { |
888 | struct igmpv3_report *ih; | |
889 | struct igmpv3_grec *grec; | |
890 | int i; | |
891 | int len; | |
892 | int num; | |
893 | int type; | |
894 | int err = 0; | |
895 | __be32 group; | |
896 | ||
897 | if (!pskb_may_pull(skb, sizeof(*ih))) | |
898 | return -EINVAL; | |
899 | ||
900 | ih = igmpv3_report_hdr(skb); | |
901 | num = ntohs(ih->ngrec); | |
902 | len = sizeof(*ih); | |
903 | ||
904 | for (i = 0; i < num; i++) { | |
905 | len += sizeof(*grec); | |
906 | if (!pskb_may_pull(skb, len)) | |
907 | return -EINVAL; | |
908 | ||
fd218cf9 | 909 | grec = (void *)(skb->data + len - sizeof(*grec)); |
eb1d1641 HX |
910 | group = grec->grec_mca; |
911 | type = grec->grec_type; | |
912 | ||
8eabf95c | 913 | len += ntohs(grec->grec_nsrcs) * 4; |
eb1d1641 HX |
914 | if (!pskb_may_pull(skb, len)) |
915 | return -EINVAL; | |
916 | ||
917 | /* We treat this as an IGMPv2 report for now. */ | |
918 | switch (type) { | |
919 | case IGMPV3_MODE_IS_INCLUDE: | |
920 | case IGMPV3_MODE_IS_EXCLUDE: | |
921 | case IGMPV3_CHANGE_TO_INCLUDE: | |
922 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
923 | case IGMPV3_ALLOW_NEW_SOURCES: | |
924 | case IGMPV3_BLOCK_OLD_SOURCES: | |
925 | break; | |
926 | ||
927 | default: | |
928 | continue; | |
929 | } | |
930 | ||
8ef2a9a5 | 931 | err = br_ip4_multicast_add_group(br, port, group); |
eb1d1641 HX |
932 | if (err) |
933 | break; | |
934 | } | |
935 | ||
936 | return err; | |
937 | } | |
938 | ||
dfd56b8b | 939 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
940 | static int br_ip6_multicast_mld2_report(struct net_bridge *br, |
941 | struct net_bridge_port *port, | |
942 | struct sk_buff *skb) | |
943 | { | |
944 | struct icmp6hdr *icmp6h; | |
945 | struct mld2_grec *grec; | |
946 | int i; | |
947 | int len; | |
948 | int num; | |
949 | int err = 0; | |
950 | ||
951 | if (!pskb_may_pull(skb, sizeof(*icmp6h))) | |
952 | return -EINVAL; | |
953 | ||
954 | icmp6h = icmp6_hdr(skb); | |
955 | num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); | |
956 | len = sizeof(*icmp6h); | |
957 | ||
958 | for (i = 0; i < num; i++) { | |
959 | __be16 *nsrcs, _nsrcs; | |
960 | ||
961 | nsrcs = skb_header_pointer(skb, | |
962 | len + offsetof(struct mld2_grec, | |
649e984d | 963 | grec_nsrcs), |
08b202b6 YH |
964 | sizeof(_nsrcs), &_nsrcs); |
965 | if (!nsrcs) | |
966 | return -EINVAL; | |
967 | ||
968 | if (!pskb_may_pull(skb, | |
969 | len + sizeof(*grec) + | |
d41db9f3 | 970 | sizeof(struct in6_addr) * ntohs(*nsrcs))) |
08b202b6 YH |
971 | return -EINVAL; |
972 | ||
973 | grec = (struct mld2_grec *)(skb->data + len); | |
d41db9f3 LL |
974 | len += sizeof(*grec) + |
975 | sizeof(struct in6_addr) * ntohs(*nsrcs); | |
08b202b6 YH |
976 | |
977 | /* We treat these as MLDv1 reports for now. */ | |
978 | switch (grec->grec_type) { | |
979 | case MLD2_MODE_IS_INCLUDE: | |
980 | case MLD2_MODE_IS_EXCLUDE: | |
981 | case MLD2_CHANGE_TO_INCLUDE: | |
982 | case MLD2_CHANGE_TO_EXCLUDE: | |
983 | case MLD2_ALLOW_NEW_SOURCES: | |
984 | case MLD2_BLOCK_OLD_SOURCES: | |
985 | break; | |
986 | ||
987 | default: | |
988 | continue; | |
989 | } | |
990 | ||
991 | err = br_ip6_multicast_add_group(br, port, &grec->grec_mca); | |
992 | if (!err) | |
993 | break; | |
994 | } | |
995 | ||
996 | return err; | |
997 | } | |
998 | #endif | |
999 | ||
7e80c124 | 1000 | /* |
1001 | * Add port to rotuer_list | |
1002 | * list is maintained ordered by pointer value | |
1003 | * and locked by br->multicast_lock and RCU | |
1004 | */ | |
0909e117 HX |
1005 | static void br_multicast_add_router(struct net_bridge *br, |
1006 | struct net_bridge_port *port) | |
1007 | { | |
dcdca2c4 | 1008 | struct net_bridge_port *p; |
7e80c124 | 1009 | struct hlist_node *n, *slot = NULL; |
dcdca2c4 | 1010 | |
709b9326 | 1011 | hlist_for_each_entry(p, n, &br->router_list, rlist) { |
7e80c124 | 1012 | if ((unsigned long) port >= (unsigned long) p) |
1013 | break; | |
1014 | slot = n; | |
dcdca2c4 | 1015 | } |
1016 | ||
7e80c124 | 1017 | if (slot) |
1018 | hlist_add_after_rcu(slot, &port->rlist); | |
dcdca2c4 | 1019 | else |
1020 | hlist_add_head_rcu(&port->rlist, &br->router_list); | |
0909e117 HX |
1021 | } |
1022 | ||
eb1d1641 HX |
1023 | static void br_multicast_mark_router(struct net_bridge *br, |
1024 | struct net_bridge_port *port) | |
1025 | { | |
1026 | unsigned long now = jiffies; | |
eb1d1641 HX |
1027 | |
1028 | if (!port) { | |
1029 | if (br->multicast_router == 1) | |
1030 | mod_timer(&br->multicast_router_timer, | |
1031 | now + br->multicast_querier_interval); | |
1032 | return; | |
1033 | } | |
1034 | ||
1035 | if (port->multicast_router != 1) | |
1036 | return; | |
1037 | ||
1038 | if (!hlist_unhashed(&port->rlist)) | |
1039 | goto timer; | |
1040 | ||
0909e117 | 1041 | br_multicast_add_router(br, port); |
eb1d1641 HX |
1042 | |
1043 | timer: | |
1044 | mod_timer(&port->multicast_router_timer, | |
1045 | now + br->multicast_querier_interval); | |
1046 | } | |
1047 | ||
1048 | static void br_multicast_query_received(struct net_bridge *br, | |
1049 | struct net_bridge_port *port, | |
8ef2a9a5 | 1050 | int saddr) |
eb1d1641 HX |
1051 | { |
1052 | if (saddr) | |
1053 | mod_timer(&br->multicast_querier_timer, | |
1054 | jiffies + br->multicast_querier_interval); | |
1055 | else if (timer_pending(&br->multicast_querier_timer)) | |
1056 | return; | |
1057 | ||
1058 | br_multicast_mark_router(br, port); | |
1059 | } | |
1060 | ||
8ef2a9a5 YH |
1061 | static int br_ip4_multicast_query(struct net_bridge *br, |
1062 | struct net_bridge_port *port, | |
1063 | struct sk_buff *skb) | |
eb1d1641 | 1064 | { |
b71d1d42 | 1065 | const struct iphdr *iph = ip_hdr(skb); |
eb1d1641 HX |
1066 | struct igmphdr *ih = igmp_hdr(skb); |
1067 | struct net_bridge_mdb_entry *mp; | |
1068 | struct igmpv3_query *ih3; | |
1069 | struct net_bridge_port_group *p; | |
e8051688 | 1070 | struct net_bridge_port_group __rcu **pp; |
eb1d1641 HX |
1071 | unsigned long max_delay; |
1072 | unsigned long now = jiffies; | |
1073 | __be32 group; | |
bec68ff1 | 1074 | int err = 0; |
eb1d1641 HX |
1075 | |
1076 | spin_lock(&br->multicast_lock); | |
1077 | if (!netif_running(br->dev) || | |
1078 | (port && port->state == BR_STATE_DISABLED)) | |
1079 | goto out; | |
1080 | ||
8ef2a9a5 | 1081 | br_multicast_query_received(br, port, !!iph->saddr); |
eb1d1641 HX |
1082 | |
1083 | group = ih->group; | |
1084 | ||
1085 | if (skb->len == sizeof(*ih)) { | |
1086 | max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); | |
1087 | ||
1088 | if (!max_delay) { | |
1089 | max_delay = 10 * HZ; | |
1090 | group = 0; | |
1091 | } | |
1092 | } else { | |
bec68ff1 YH |
1093 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) { |
1094 | err = -EINVAL; | |
1095 | goto out; | |
1096 | } | |
eb1d1641 HX |
1097 | |
1098 | ih3 = igmpv3_query_hdr(skb); | |
1099 | if (ih3->nsrcs) | |
bec68ff1 | 1100 | goto out; |
eb1d1641 | 1101 | |
0ba8c9ec YH |
1102 | max_delay = ih3->code ? |
1103 | IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; | |
eb1d1641 HX |
1104 | } |
1105 | ||
1106 | if (!group) | |
1107 | goto out; | |
1108 | ||
e8051688 | 1109 | mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group); |
eb1d1641 HX |
1110 | if (!mp) |
1111 | goto out; | |
1112 | ||
1113 | max_delay *= br->multicast_last_member_count; | |
1114 | ||
8a870178 | 1115 | if (mp->mglist && |
eb1d1641 HX |
1116 | (timer_pending(&mp->timer) ? |
1117 | time_after(mp->timer.expires, now + max_delay) : | |
1118 | try_to_del_timer_sync(&mp->timer) >= 0)) | |
1119 | mod_timer(&mp->timer, now + max_delay); | |
1120 | ||
e8051688 ED |
1121 | for (pp = &mp->ports; |
1122 | (p = mlock_dereference(*pp, br)) != NULL; | |
1123 | pp = &p->next) { | |
eb1d1641 HX |
1124 | if (timer_pending(&p->timer) ? |
1125 | time_after(p->timer.expires, now + max_delay) : | |
1126 | try_to_del_timer_sync(&p->timer) >= 0) | |
24f9cdcb | 1127 | mod_timer(&p->timer, now + max_delay); |
eb1d1641 HX |
1128 | } |
1129 | ||
1130 | out: | |
1131 | spin_unlock(&br->multicast_lock); | |
bec68ff1 | 1132 | return err; |
eb1d1641 HX |
1133 | } |
1134 | ||
dfd56b8b | 1135 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1136 | static int br_ip6_multicast_query(struct net_bridge *br, |
1137 | struct net_bridge_port *port, | |
1138 | struct sk_buff *skb) | |
1139 | { | |
b71d1d42 | 1140 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
eca2a43b | 1141 | struct mld_msg *mld; |
08b202b6 YH |
1142 | struct net_bridge_mdb_entry *mp; |
1143 | struct mld2_query *mld2q; | |
e8051688 ED |
1144 | struct net_bridge_port_group *p; |
1145 | struct net_bridge_port_group __rcu **pp; | |
08b202b6 YH |
1146 | unsigned long max_delay; |
1147 | unsigned long now = jiffies; | |
b71d1d42 | 1148 | const struct in6_addr *group = NULL; |
08b202b6 YH |
1149 | int err = 0; |
1150 | ||
1151 | spin_lock(&br->multicast_lock); | |
1152 | if (!netif_running(br->dev) || | |
1153 | (port && port->state == BR_STATE_DISABLED)) | |
1154 | goto out; | |
1155 | ||
1156 | br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr)); | |
1157 | ||
1158 | if (skb->len == sizeof(*mld)) { | |
1159 | if (!pskb_may_pull(skb, sizeof(*mld))) { | |
1160 | err = -EINVAL; | |
1161 | goto out; | |
1162 | } | |
1163 | mld = (struct mld_msg *) icmp6_hdr(skb); | |
4715213d | 1164 | max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay)); |
08b202b6 YH |
1165 | if (max_delay) |
1166 | group = &mld->mld_mca; | |
1167 | } else if (skb->len >= sizeof(*mld2q)) { | |
eca2a43b | 1168 | u16 mrc; |
08b202b6 YH |
1169 | if (!pskb_may_pull(skb, sizeof(*mld2q))) { |
1170 | err = -EINVAL; | |
1171 | goto out; | |
1172 | } | |
1173 | mld2q = (struct mld2_query *)icmp6_hdr(skb); | |
1174 | if (!mld2q->mld2q_nsrcs) | |
1175 | group = &mld2q->mld2q_mca; | |
eca2a43b | 1176 | mrc = ntohs(mld2q->mld2q_mrc); |
1177 | max_delay = mrc ? MLDV2_MRC(mrc) : 1; | |
08b202b6 YH |
1178 | } |
1179 | ||
1180 | if (!group) | |
1181 | goto out; | |
1182 | ||
e8051688 | 1183 | mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group); |
08b202b6 YH |
1184 | if (!mp) |
1185 | goto out; | |
1186 | ||
1187 | max_delay *= br->multicast_last_member_count; | |
8a870178 | 1188 | if (mp->mglist && |
08b202b6 YH |
1189 | (timer_pending(&mp->timer) ? |
1190 | time_after(mp->timer.expires, now + max_delay) : | |
1191 | try_to_del_timer_sync(&mp->timer) >= 0)) | |
1192 | mod_timer(&mp->timer, now + max_delay); | |
1193 | ||
e8051688 ED |
1194 | for (pp = &mp->ports; |
1195 | (p = mlock_dereference(*pp, br)) != NULL; | |
1196 | pp = &p->next) { | |
08b202b6 YH |
1197 | if (timer_pending(&p->timer) ? |
1198 | time_after(p->timer.expires, now + max_delay) : | |
1199 | try_to_del_timer_sync(&p->timer) >= 0) | |
24f9cdcb | 1200 | mod_timer(&p->timer, now + max_delay); |
08b202b6 YH |
1201 | } |
1202 | ||
1203 | out: | |
1204 | spin_unlock(&br->multicast_lock); | |
1205 | return err; | |
1206 | } | |
1207 | #endif | |
1208 | ||
eb1d1641 HX |
1209 | static void br_multicast_leave_group(struct net_bridge *br, |
1210 | struct net_bridge_port *port, | |
8ef2a9a5 | 1211 | struct br_ip *group) |
eb1d1641 HX |
1212 | { |
1213 | struct net_bridge_mdb_htable *mdb; | |
1214 | struct net_bridge_mdb_entry *mp; | |
1215 | struct net_bridge_port_group *p; | |
1216 | unsigned long now; | |
1217 | unsigned long time; | |
1218 | ||
eb1d1641 HX |
1219 | spin_lock(&br->multicast_lock); |
1220 | if (!netif_running(br->dev) || | |
1221 | (port && port->state == BR_STATE_DISABLED) || | |
1222 | timer_pending(&br->multicast_querier_timer)) | |
1223 | goto out; | |
1224 | ||
e8051688 | 1225 | mdb = mlock_dereference(br->mdb, br); |
eb1d1641 HX |
1226 | mp = br_mdb_ip_get(mdb, group); |
1227 | if (!mp) | |
1228 | goto out; | |
1229 | ||
c2d3babf | 1230 | if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) { |
50426b59 AW |
1231 | struct net_bridge_port_group __rcu **pp; |
1232 | ||
1233 | for (pp = &mp->ports; | |
1234 | (p = mlock_dereference(*pp, br)) != NULL; | |
1235 | pp = &p->next) { | |
1236 | if (p->port != port) | |
1237 | continue; | |
1238 | ||
1239 | rcu_assign_pointer(*pp, p->next); | |
1240 | hlist_del_init(&p->mglist); | |
1241 | del_timer(&p->timer); | |
1242 | call_rcu_bh(&p->rcu, br_multicast_free_pg); | |
37a393bc | 1243 | br_mdb_notify(br->dev, port, group, RTM_DELMDB); |
50426b59 AW |
1244 | |
1245 | if (!mp->ports && !mp->mglist && | |
1246 | netif_running(br->dev)) | |
1247 | mod_timer(&mp->timer, jiffies); | |
1248 | } | |
1249 | goto out; | |
1250 | } | |
1251 | ||
eb1d1641 HX |
1252 | now = jiffies; |
1253 | time = now + br->multicast_last_member_count * | |
1254 | br->multicast_last_member_interval; | |
1255 | ||
1256 | if (!port) { | |
8a870178 | 1257 | if (mp->mglist && |
eb1d1641 HX |
1258 | (timer_pending(&mp->timer) ? |
1259 | time_after(mp->timer.expires, time) : | |
1260 | try_to_del_timer_sync(&mp->timer) >= 0)) { | |
1261 | mod_timer(&mp->timer, time); | |
eb1d1641 HX |
1262 | } |
1263 | ||
1264 | goto out; | |
1265 | } | |
1266 | ||
e8051688 ED |
1267 | for (p = mlock_dereference(mp->ports, br); |
1268 | p != NULL; | |
1269 | p = mlock_dereference(p->next, br)) { | |
eb1d1641 HX |
1270 | if (p->port != port) |
1271 | continue; | |
1272 | ||
1273 | if (!hlist_unhashed(&p->mglist) && | |
1274 | (timer_pending(&p->timer) ? | |
1275 | time_after(p->timer.expires, time) : | |
1276 | try_to_del_timer_sync(&p->timer) >= 0)) { | |
1277 | mod_timer(&p->timer, time); | |
eb1d1641 HX |
1278 | } |
1279 | ||
1280 | break; | |
1281 | } | |
1282 | ||
1283 | out: | |
1284 | spin_unlock(&br->multicast_lock); | |
1285 | } | |
1286 | ||
8ef2a9a5 YH |
1287 | static void br_ip4_multicast_leave_group(struct net_bridge *br, |
1288 | struct net_bridge_port *port, | |
1289 | __be32 group) | |
1290 | { | |
1291 | struct br_ip br_group; | |
1292 | ||
1293 | if (ipv4_is_local_multicast(group)) | |
1294 | return; | |
1295 | ||
1296 | br_group.u.ip4 = group; | |
1297 | br_group.proto = htons(ETH_P_IP); | |
1298 | ||
1299 | br_multicast_leave_group(br, port, &br_group); | |
1300 | } | |
1301 | ||
dfd56b8b | 1302 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1303 | static void br_ip6_multicast_leave_group(struct net_bridge *br, |
1304 | struct net_bridge_port *port, | |
1305 | const struct in6_addr *group) | |
1306 | { | |
1307 | struct br_ip br_group; | |
1308 | ||
e4de9f9e | 1309 | if (!ipv6_is_transient_multicast(group)) |
08b202b6 YH |
1310 | return; |
1311 | ||
4e3fd7a0 | 1312 | br_group.u.ip6 = *group; |
08b202b6 YH |
1313 | br_group.proto = htons(ETH_P_IPV6); |
1314 | ||
1315 | br_multicast_leave_group(br, port, &br_group); | |
1316 | } | |
1317 | #endif | |
8ef2a9a5 | 1318 | |
eb1d1641 HX |
1319 | static int br_multicast_ipv4_rcv(struct net_bridge *br, |
1320 | struct net_bridge_port *port, | |
1321 | struct sk_buff *skb) | |
1322 | { | |
1323 | struct sk_buff *skb2 = skb; | |
b71d1d42 | 1324 | const struct iphdr *iph; |
eb1d1641 | 1325 | struct igmphdr *ih; |
95c96174 ED |
1326 | unsigned int len; |
1327 | unsigned int offset; | |
eb1d1641 HX |
1328 | int err; |
1329 | ||
eb1d1641 HX |
1330 | /* We treat OOM as packet loss for now. */ |
1331 | if (!pskb_may_pull(skb, sizeof(*iph))) | |
1332 | return -EINVAL; | |
1333 | ||
1334 | iph = ip_hdr(skb); | |
1335 | ||
1336 | if (iph->ihl < 5 || iph->version != 4) | |
1337 | return -EINVAL; | |
1338 | ||
1339 | if (!pskb_may_pull(skb, ip_hdrlen(skb))) | |
1340 | return -EINVAL; | |
1341 | ||
1342 | iph = ip_hdr(skb); | |
1343 | ||
1344 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
1345 | return -EINVAL; | |
1346 | ||
bd4265fe HX |
1347 | if (iph->protocol != IPPROTO_IGMP) { |
1348 | if ((iph->daddr & IGMP_LOCAL_GROUP_MASK) != IGMP_LOCAL_GROUP) | |
1349 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; | |
eb1d1641 | 1350 | return 0; |
bd4265fe | 1351 | } |
eb1d1641 HX |
1352 | |
1353 | len = ntohs(iph->tot_len); | |
1354 | if (skb->len < len || len < ip_hdrlen(skb)) | |
1355 | return -EINVAL; | |
1356 | ||
1357 | if (skb->len > len) { | |
1358 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1359 | if (!skb2) | |
1360 | return -ENOMEM; | |
1361 | ||
1362 | err = pskb_trim_rcsum(skb2, len); | |
1363 | if (err) | |
8440853b | 1364 | goto err_out; |
eb1d1641 HX |
1365 | } |
1366 | ||
1367 | len -= ip_hdrlen(skb2); | |
1368 | offset = skb_network_offset(skb2) + ip_hdrlen(skb2); | |
1369 | __skb_pull(skb2, offset); | |
1370 | skb_reset_transport_header(skb2); | |
1371 | ||
1372 | err = -EINVAL; | |
1373 | if (!pskb_may_pull(skb2, sizeof(*ih))) | |
1374 | goto out; | |
1375 | ||
eb1d1641 HX |
1376 | switch (skb2->ip_summed) { |
1377 | case CHECKSUM_COMPLETE: | |
1378 | if (!csum_fold(skb2->csum)) | |
1379 | break; | |
1380 | /* fall through */ | |
1381 | case CHECKSUM_NONE: | |
1382 | skb2->csum = 0; | |
1383 | if (skb_checksum_complete(skb2)) | |
8440853b | 1384 | goto out; |
eb1d1641 HX |
1385 | } |
1386 | ||
1387 | err = 0; | |
1388 | ||
1389 | BR_INPUT_SKB_CB(skb)->igmp = 1; | |
1390 | ih = igmp_hdr(skb2); | |
1391 | ||
1392 | switch (ih->type) { | |
1393 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1394 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
62b2bcb4 | 1395 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
8ef2a9a5 | 1396 | err = br_ip4_multicast_add_group(br, port, ih->group); |
eb1d1641 HX |
1397 | break; |
1398 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
8ef2a9a5 | 1399 | err = br_ip4_multicast_igmp3_report(br, port, skb2); |
eb1d1641 HX |
1400 | break; |
1401 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
8ef2a9a5 | 1402 | err = br_ip4_multicast_query(br, port, skb2); |
eb1d1641 HX |
1403 | break; |
1404 | case IGMP_HOST_LEAVE_MESSAGE: | |
8ef2a9a5 | 1405 | br_ip4_multicast_leave_group(br, port, ih->group); |
eb1d1641 HX |
1406 | break; |
1407 | } | |
1408 | ||
1409 | out: | |
1410 | __skb_push(skb2, offset); | |
8440853b | 1411 | err_out: |
eb1d1641 HX |
1412 | if (skb2 != skb) |
1413 | kfree_skb(skb2); | |
1414 | return err; | |
1415 | } | |
1416 | ||
dfd56b8b | 1417 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1418 | static int br_multicast_ipv6_rcv(struct net_bridge *br, |
1419 | struct net_bridge_port *port, | |
1420 | struct sk_buff *skb) | |
1421 | { | |
9d89081d | 1422 | struct sk_buff *skb2; |
b71d1d42 | 1423 | const struct ipv6hdr *ip6h; |
22df1331 | 1424 | u8 icmp6_type; |
08b202b6 | 1425 | u8 nexthdr; |
75f2811c | 1426 | __be16 frag_off; |
95c96174 | 1427 | unsigned int len; |
bb7a0bd6 | 1428 | int offset; |
08b202b6 YH |
1429 | int err; |
1430 | ||
08b202b6 YH |
1431 | if (!pskb_may_pull(skb, sizeof(*ip6h))) |
1432 | return -EINVAL; | |
1433 | ||
1434 | ip6h = ipv6_hdr(skb); | |
1435 | ||
1436 | /* | |
1437 | * We're interested in MLD messages only. | |
1438 | * - Version is 6 | |
1439 | * - MLD has always Router Alert hop-by-hop option | |
1440 | * - But we do not support jumbrograms. | |
1441 | */ | |
1442 | if (ip6h->version != 6 || | |
1443 | ip6h->nexthdr != IPPROTO_HOPOPTS || | |
1444 | ip6h->payload_len == 0) | |
1445 | return 0; | |
1446 | ||
ff9a57a6 | 1447 | len = ntohs(ip6h->payload_len) + sizeof(*ip6h); |
08b202b6 YH |
1448 | if (skb->len < len) |
1449 | return -EINVAL; | |
1450 | ||
1451 | nexthdr = ip6h->nexthdr; | |
75f2811c | 1452 | offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off); |
08b202b6 YH |
1453 | |
1454 | if (offset < 0 || nexthdr != IPPROTO_ICMPV6) | |
1455 | return 0; | |
1456 | ||
1457 | /* Okay, we found ICMPv6 header */ | |
1458 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1459 | if (!skb2) | |
1460 | return -ENOMEM; | |
1461 | ||
9d89081d TW |
1462 | err = -EINVAL; |
1463 | if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr))) | |
1464 | goto out; | |
1465 | ||
08b202b6 YH |
1466 | len -= offset - skb_network_offset(skb2); |
1467 | ||
1468 | __skb_pull(skb2, offset); | |
1469 | skb_reset_transport_header(skb2); | |
fa2da8cd | 1470 | skb_postpull_rcsum(skb2, skb_network_header(skb2), |
1471 | skb_network_header_len(skb2)); | |
08b202b6 | 1472 | |
22df1331 | 1473 | icmp6_type = icmp6_hdr(skb2)->icmp6_type; |
08b202b6 | 1474 | |
22df1331 | 1475 | switch (icmp6_type) { |
08b202b6 YH |
1476 | case ICMPV6_MGM_QUERY: |
1477 | case ICMPV6_MGM_REPORT: | |
1478 | case ICMPV6_MGM_REDUCTION: | |
1479 | case ICMPV6_MLD2_REPORT: | |
1480 | break; | |
1481 | default: | |
1482 | err = 0; | |
1483 | goto out; | |
1484 | } | |
1485 | ||
1486 | /* Okay, we found MLD message. Check further. */ | |
1487 | if (skb2->len > len) { | |
1488 | err = pskb_trim_rcsum(skb2, len); | |
1489 | if (err) | |
1490 | goto out; | |
4b275d7e | 1491 | err = -EINVAL; |
08b202b6 YH |
1492 | } |
1493 | ||
4b275d7e YZ |
1494 | ip6h = ipv6_hdr(skb2); |
1495 | ||
08b202b6 YH |
1496 | switch (skb2->ip_summed) { |
1497 | case CHECKSUM_COMPLETE: | |
4b275d7e YZ |
1498 | if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len, |
1499 | IPPROTO_ICMPV6, skb2->csum)) | |
08b202b6 YH |
1500 | break; |
1501 | /*FALLTHROUGH*/ | |
1502 | case CHECKSUM_NONE: | |
4b275d7e YZ |
1503 | skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr, |
1504 | &ip6h->daddr, | |
1505 | skb2->len, | |
1506 | IPPROTO_ICMPV6, 0)); | |
1507 | if (__skb_checksum_complete(skb2)) | |
08b202b6 YH |
1508 | goto out; |
1509 | } | |
1510 | ||
1511 | err = 0; | |
1512 | ||
1513 | BR_INPUT_SKB_CB(skb)->igmp = 1; | |
1514 | ||
22df1331 | 1515 | switch (icmp6_type) { |
08b202b6 YH |
1516 | case ICMPV6_MGM_REPORT: |
1517 | { | |
9d89081d TW |
1518 | struct mld_msg *mld; |
1519 | if (!pskb_may_pull(skb2, sizeof(*mld))) { | |
1520 | err = -EINVAL; | |
1521 | goto out; | |
1522 | } | |
1523 | mld = (struct mld_msg *)skb_transport_header(skb2); | |
fc2af6c7 | 1524 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
08b202b6 YH |
1525 | err = br_ip6_multicast_add_group(br, port, &mld->mld_mca); |
1526 | break; | |
1527 | } | |
1528 | case ICMPV6_MLD2_REPORT: | |
1529 | err = br_ip6_multicast_mld2_report(br, port, skb2); | |
1530 | break; | |
1531 | case ICMPV6_MGM_QUERY: | |
1532 | err = br_ip6_multicast_query(br, port, skb2); | |
1533 | break; | |
1534 | case ICMPV6_MGM_REDUCTION: | |
1535 | { | |
9d89081d TW |
1536 | struct mld_msg *mld; |
1537 | if (!pskb_may_pull(skb2, sizeof(*mld))) { | |
1538 | err = -EINVAL; | |
1539 | goto out; | |
1540 | } | |
1541 | mld = (struct mld_msg *)skb_transport_header(skb2); | |
08b202b6 YH |
1542 | br_ip6_multicast_leave_group(br, port, &mld->mld_mca); |
1543 | } | |
1544 | } | |
1545 | ||
1546 | out: | |
9d89081d | 1547 | kfree_skb(skb2); |
08b202b6 YH |
1548 | return err; |
1549 | } | |
1550 | #endif | |
1551 | ||
eb1d1641 HX |
1552 | int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, |
1553 | struct sk_buff *skb) | |
1554 | { | |
1fafc7a9 YH |
1555 | BR_INPUT_SKB_CB(skb)->igmp = 0; |
1556 | BR_INPUT_SKB_CB(skb)->mrouters_only = 0; | |
1557 | ||
eb1d1641 HX |
1558 | if (br->multicast_disabled) |
1559 | return 0; | |
1560 | ||
1561 | switch (skb->protocol) { | |
1562 | case htons(ETH_P_IP): | |
1563 | return br_multicast_ipv4_rcv(br, port, skb); | |
dfd56b8b | 1564 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1565 | case htons(ETH_P_IPV6): |
1566 | return br_multicast_ipv6_rcv(br, port, skb); | |
1567 | #endif | |
eb1d1641 HX |
1568 | } |
1569 | ||
1570 | return 0; | |
1571 | } | |
1572 | ||
1573 | static void br_multicast_query_expired(unsigned long data) | |
1574 | { | |
1575 | struct net_bridge *br = (void *)data; | |
1576 | ||
1577 | spin_lock(&br->multicast_lock); | |
1578 | if (br->multicast_startup_queries_sent < | |
1579 | br->multicast_startup_query_count) | |
1580 | br->multicast_startup_queries_sent++; | |
1581 | ||
1582 | br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent); | |
1583 | ||
1584 | spin_unlock(&br->multicast_lock); | |
1585 | } | |
1586 | ||
1587 | void br_multicast_init(struct net_bridge *br) | |
1588 | { | |
1589 | br->hash_elasticity = 4; | |
1590 | br->hash_max = 512; | |
1591 | ||
1592 | br->multicast_router = 1; | |
c5c23260 | 1593 | br->multicast_querier = 0; |
eb1d1641 HX |
1594 | br->multicast_last_member_count = 2; |
1595 | br->multicast_startup_query_count = 2; | |
1596 | ||
1597 | br->multicast_last_member_interval = HZ; | |
1598 | br->multicast_query_response_interval = 10 * HZ; | |
1599 | br->multicast_startup_query_interval = 125 * HZ / 4; | |
1600 | br->multicast_query_interval = 125 * HZ; | |
1601 | br->multicast_querier_interval = 255 * HZ; | |
1602 | br->multicast_membership_interval = 260 * HZ; | |
1603 | ||
1604 | spin_lock_init(&br->multicast_lock); | |
1605 | setup_timer(&br->multicast_router_timer, | |
1606 | br_multicast_local_router_expired, 0); | |
1607 | setup_timer(&br->multicast_querier_timer, | |
bb63f1f8 | 1608 | br_multicast_querier_expired, (unsigned long)br); |
eb1d1641 HX |
1609 | setup_timer(&br->multicast_query_timer, br_multicast_query_expired, |
1610 | (unsigned long)br); | |
ee07c6e7 | 1611 | br_mdb_init(); |
eb1d1641 HX |
1612 | } |
1613 | ||
1614 | void br_multicast_open(struct net_bridge *br) | |
1615 | { | |
1616 | br->multicast_startup_queries_sent = 0; | |
1617 | ||
1618 | if (br->multicast_disabled) | |
1619 | return; | |
1620 | ||
1621 | mod_timer(&br->multicast_query_timer, jiffies); | |
1622 | } | |
1623 | ||
1624 | void br_multicast_stop(struct net_bridge *br) | |
1625 | { | |
1626 | struct net_bridge_mdb_htable *mdb; | |
1627 | struct net_bridge_mdb_entry *mp; | |
1628 | struct hlist_node *p, *n; | |
1629 | u32 ver; | |
1630 | int i; | |
1631 | ||
1632 | del_timer_sync(&br->multicast_router_timer); | |
1633 | del_timer_sync(&br->multicast_querier_timer); | |
1634 | del_timer_sync(&br->multicast_query_timer); | |
1635 | ||
1636 | spin_lock_bh(&br->multicast_lock); | |
e8051688 | 1637 | mdb = mlock_dereference(br->mdb, br); |
eb1d1641 HX |
1638 | if (!mdb) |
1639 | goto out; | |
1640 | ||
1641 | br->mdb = NULL; | |
1642 | ||
1643 | ver = mdb->ver; | |
1644 | for (i = 0; i < mdb->max; i++) { | |
1645 | hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i], | |
1646 | hlist[ver]) { | |
1647 | del_timer(&mp->timer); | |
eb1d1641 HX |
1648 | call_rcu_bh(&mp->rcu, br_multicast_free_group); |
1649 | } | |
1650 | } | |
1651 | ||
1652 | if (mdb->old) { | |
1653 | spin_unlock_bh(&br->multicast_lock); | |
10cc2b50 | 1654 | rcu_barrier_bh(); |
eb1d1641 HX |
1655 | spin_lock_bh(&br->multicast_lock); |
1656 | WARN_ON(mdb->old); | |
1657 | } | |
1658 | ||
1659 | mdb->old = mdb; | |
1660 | call_rcu_bh(&mdb->rcu, br_mdb_free); | |
1661 | ||
1662 | out: | |
1663 | spin_unlock_bh(&br->multicast_lock); | |
1664 | } | |
0909e117 HX |
1665 | |
1666 | int br_multicast_set_router(struct net_bridge *br, unsigned long val) | |
1667 | { | |
1668 | int err = -ENOENT; | |
1669 | ||
1670 | spin_lock_bh(&br->multicast_lock); | |
1671 | if (!netif_running(br->dev)) | |
1672 | goto unlock; | |
1673 | ||
1674 | switch (val) { | |
1675 | case 0: | |
1676 | case 2: | |
1677 | del_timer(&br->multicast_router_timer); | |
1678 | /* fall through */ | |
1679 | case 1: | |
1680 | br->multicast_router = val; | |
1681 | err = 0; | |
1682 | break; | |
1683 | ||
1684 | default: | |
1685 | err = -EINVAL; | |
1686 | break; | |
1687 | } | |
1688 | ||
1689 | unlock: | |
1690 | spin_unlock_bh(&br->multicast_lock); | |
1691 | ||
1692 | return err; | |
1693 | } | |
1694 | ||
1695 | int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) | |
1696 | { | |
1697 | struct net_bridge *br = p->br; | |
1698 | int err = -ENOENT; | |
1699 | ||
1700 | spin_lock(&br->multicast_lock); | |
1701 | if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED) | |
1702 | goto unlock; | |
1703 | ||
1704 | switch (val) { | |
1705 | case 0: | |
1706 | case 1: | |
1707 | case 2: | |
1708 | p->multicast_router = val; | |
1709 | err = 0; | |
1710 | ||
1711 | if (val < 2 && !hlist_unhashed(&p->rlist)) | |
1712 | hlist_del_init_rcu(&p->rlist); | |
1713 | ||
1714 | if (val == 1) | |
1715 | break; | |
1716 | ||
1717 | del_timer(&p->multicast_router_timer); | |
1718 | ||
1719 | if (val == 0) | |
1720 | break; | |
1721 | ||
1722 | br_multicast_add_router(br, p); | |
1723 | break; | |
1724 | ||
1725 | default: | |
1726 | err = -EINVAL; | |
1727 | break; | |
1728 | } | |
1729 | ||
1730 | unlock: | |
1731 | spin_unlock(&br->multicast_lock); | |
1732 | ||
1733 | return err; | |
1734 | } | |
561f1103 | 1735 | |
74857216 | 1736 | static void br_multicast_start_querier(struct net_bridge *br) |
561f1103 HX |
1737 | { |
1738 | struct net_bridge_port *port; | |
74857216 HX |
1739 | |
1740 | br_multicast_open(br); | |
1741 | ||
1742 | list_for_each_entry(port, &br->port_list, list) { | |
1743 | if (port->state == BR_STATE_DISABLED || | |
1744 | port->state == BR_STATE_BLOCKING) | |
1745 | continue; | |
1746 | ||
1747 | __br_multicast_enable_port(port); | |
1748 | } | |
1749 | } | |
1750 | ||
1751 | int br_multicast_toggle(struct net_bridge *br, unsigned long val) | |
1752 | { | |
3a7fda06 | 1753 | int err = 0; |
e8051688 | 1754 | struct net_bridge_mdb_htable *mdb; |
561f1103 | 1755 | |
ef5e0d82 | 1756 | spin_lock_bh(&br->multicast_lock); |
561f1103 HX |
1757 | if (br->multicast_disabled == !val) |
1758 | goto unlock; | |
1759 | ||
1760 | br->multicast_disabled = !val; | |
1761 | if (br->multicast_disabled) | |
1762 | goto unlock; | |
1763 | ||
3a7fda06 HX |
1764 | if (!netif_running(br->dev)) |
1765 | goto unlock; | |
1766 | ||
e8051688 ED |
1767 | mdb = mlock_dereference(br->mdb, br); |
1768 | if (mdb) { | |
1769 | if (mdb->old) { | |
561f1103 HX |
1770 | err = -EEXIST; |
1771 | rollback: | |
1772 | br->multicast_disabled = !!val; | |
1773 | goto unlock; | |
1774 | } | |
1775 | ||
e8051688 | 1776 | err = br_mdb_rehash(&br->mdb, mdb->max, |
561f1103 HX |
1777 | br->hash_elasticity); |
1778 | if (err) | |
1779 | goto rollback; | |
1780 | } | |
1781 | ||
74857216 | 1782 | br_multicast_start_querier(br); |
561f1103 HX |
1783 | |
1784 | unlock: | |
ef5e0d82 | 1785 | spin_unlock_bh(&br->multicast_lock); |
561f1103 HX |
1786 | |
1787 | return err; | |
1788 | } | |
b195167f | 1789 | |
c5c23260 HX |
1790 | int br_multicast_set_querier(struct net_bridge *br, unsigned long val) |
1791 | { | |
1792 | val = !!val; | |
1793 | ||
1794 | spin_lock_bh(&br->multicast_lock); | |
1795 | if (br->multicast_querier == val) | |
1796 | goto unlock; | |
1797 | ||
1798 | br->multicast_querier = val; | |
1799 | if (val) | |
1800 | br_multicast_start_querier(br); | |
1801 | ||
1802 | unlock: | |
1803 | spin_unlock_bh(&br->multicast_lock); | |
1804 | ||
1805 | return 0; | |
1806 | } | |
1807 | ||
b195167f HX |
1808 | int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) |
1809 | { | |
1810 | int err = -ENOENT; | |
1811 | u32 old; | |
e8051688 | 1812 | struct net_bridge_mdb_htable *mdb; |
b195167f HX |
1813 | |
1814 | spin_lock(&br->multicast_lock); | |
1815 | if (!netif_running(br->dev)) | |
1816 | goto unlock; | |
1817 | ||
1818 | err = -EINVAL; | |
1819 | if (!is_power_of_2(val)) | |
1820 | goto unlock; | |
e8051688 ED |
1821 | |
1822 | mdb = mlock_dereference(br->mdb, br); | |
1823 | if (mdb && val < mdb->size) | |
b195167f HX |
1824 | goto unlock; |
1825 | ||
1826 | err = 0; | |
1827 | ||
1828 | old = br->hash_max; | |
1829 | br->hash_max = val; | |
1830 | ||
e8051688 ED |
1831 | if (mdb) { |
1832 | if (mdb->old) { | |
b195167f HX |
1833 | err = -EEXIST; |
1834 | rollback: | |
1835 | br->hash_max = old; | |
1836 | goto unlock; | |
1837 | } | |
1838 | ||
1839 | err = br_mdb_rehash(&br->mdb, br->hash_max, | |
1840 | br->hash_elasticity); | |
1841 | if (err) | |
1842 | goto rollback; | |
1843 | } | |
1844 | ||
1845 | unlock: | |
1846 | spin_unlock(&br->multicast_lock); | |
1847 | ||
1848 | return err; | |
1849 | } |