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; | |
b0e9a30d VY |
42 | if (a->vid != b->vid) |
43 | return 0; | |
8ef2a9a5 YH |
44 | switch (a->proto) { |
45 | case htons(ETH_P_IP): | |
46 | return a->u.ip4 == b->u.ip4; | |
dfd56b8b | 47 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
48 | case htons(ETH_P_IPV6): |
49 | return ipv6_addr_equal(&a->u.ip6, &b->u.ip6); | |
50 | #endif | |
8ef2a9a5 YH |
51 | } |
52 | return 0; | |
53 | } | |
54 | ||
b0e9a30d VY |
55 | static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip, |
56 | __u16 vid) | |
eb1d1641 | 57 | { |
b0e9a30d | 58 | return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1); |
eb1d1641 HX |
59 | } |
60 | ||
dfd56b8b | 61 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 62 | static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb, |
b0e9a30d VY |
63 | const struct in6_addr *ip, |
64 | __u16 vid) | |
08b202b6 | 65 | { |
b0e9a30d VY |
66 | return jhash_2words(ipv6_addr_hash(ip), vid, |
67 | mdb->secret) & (mdb->max - 1); | |
08b202b6 YH |
68 | } |
69 | #endif | |
70 | ||
8ef2a9a5 YH |
71 | static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb, |
72 | struct br_ip *ip) | |
73 | { | |
74 | switch (ip->proto) { | |
75 | case htons(ETH_P_IP): | |
b0e9a30d | 76 | return __br_ip4_hash(mdb, ip->u.ip4, ip->vid); |
dfd56b8b | 77 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 78 | case htons(ETH_P_IPV6): |
b0e9a30d | 79 | return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid); |
08b202b6 | 80 | #endif |
8ef2a9a5 YH |
81 | } |
82 | return 0; | |
eb1d1641 HX |
83 | } |
84 | ||
85 | static struct net_bridge_mdb_entry *__br_mdb_ip_get( | |
8ef2a9a5 | 86 | struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash) |
eb1d1641 HX |
87 | { |
88 | struct net_bridge_mdb_entry *mp; | |
eb1d1641 | 89 | |
b67bfe0d | 90 | hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) { |
8ef2a9a5 | 91 | if (br_ip_equal(&mp->addr, dst)) |
eb1d1641 HX |
92 | return mp; |
93 | } | |
94 | ||
95 | return NULL; | |
96 | } | |
97 | ||
cfd56754 CW |
98 | struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, |
99 | struct br_ip *dst) | |
7f285fa7 HX |
100 | { |
101 | if (!mdb) | |
102 | return NULL; | |
103 | ||
104 | return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst)); | |
105 | } | |
106 | ||
8ef2a9a5 | 107 | static struct net_bridge_mdb_entry *br_mdb_ip4_get( |
b0e9a30d | 108 | struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid) |
eb1d1641 | 109 | { |
8ef2a9a5 YH |
110 | struct br_ip br_dst; |
111 | ||
112 | br_dst.u.ip4 = dst; | |
113 | br_dst.proto = htons(ETH_P_IP); | |
b0e9a30d | 114 | br_dst.vid = vid; |
0821ec55 | 115 | |
7f285fa7 | 116 | return br_mdb_ip_get(mdb, &br_dst); |
8ef2a9a5 YH |
117 | } |
118 | ||
dfd56b8b | 119 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 120 | static struct net_bridge_mdb_entry *br_mdb_ip6_get( |
b0e9a30d VY |
121 | struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst, |
122 | __u16 vid) | |
08b202b6 YH |
123 | { |
124 | struct br_ip br_dst; | |
0821ec55 | 125 | |
4e3fd7a0 | 126 | br_dst.u.ip6 = *dst; |
08b202b6 | 127 | br_dst.proto = htons(ETH_P_IPV6); |
b0e9a30d | 128 | br_dst.vid = vid; |
08b202b6 | 129 | |
7f285fa7 | 130 | return br_mdb_ip_get(mdb, &br_dst); |
08b202b6 YH |
131 | } |
132 | #endif | |
133 | ||
eb1d1641 | 134 | struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, |
fbca58a2 | 135 | struct sk_buff *skb, u16 vid) |
eb1d1641 | 136 | { |
e8051688 | 137 | struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb); |
8ef2a9a5 YH |
138 | struct br_ip ip; |
139 | ||
7f285fa7 | 140 | if (br->multicast_disabled) |
eb1d1641 HX |
141 | return NULL; |
142 | ||
8ef2a9a5 | 143 | if (BR_INPUT_SKB_CB(skb)->igmp) |
eb1d1641 HX |
144 | return NULL; |
145 | ||
8ef2a9a5 | 146 | ip.proto = skb->protocol; |
fbca58a2 | 147 | ip.vid = vid; |
8ef2a9a5 | 148 | |
eb1d1641 HX |
149 | switch (skb->protocol) { |
150 | case htons(ETH_P_IP): | |
8ef2a9a5 YH |
151 | ip.u.ip4 = ip_hdr(skb)->daddr; |
152 | break; | |
dfd56b8b | 153 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 154 | case htons(ETH_P_IPV6): |
4e3fd7a0 | 155 | ip.u.ip6 = ipv6_hdr(skb)->daddr; |
08b202b6 YH |
156 | break; |
157 | #endif | |
8ef2a9a5 YH |
158 | default: |
159 | return NULL; | |
eb1d1641 HX |
160 | } |
161 | ||
8ef2a9a5 | 162 | return br_mdb_ip_get(mdb, &ip); |
eb1d1641 HX |
163 | } |
164 | ||
165 | static void br_mdb_free(struct rcu_head *head) | |
166 | { | |
167 | struct net_bridge_mdb_htable *mdb = | |
168 | container_of(head, struct net_bridge_mdb_htable, rcu); | |
169 | struct net_bridge_mdb_htable *old = mdb->old; | |
170 | ||
171 | mdb->old = NULL; | |
172 | kfree(old->mhash); | |
173 | kfree(old); | |
174 | } | |
175 | ||
176 | static int br_mdb_copy(struct net_bridge_mdb_htable *new, | |
177 | struct net_bridge_mdb_htable *old, | |
178 | int elasticity) | |
179 | { | |
180 | struct net_bridge_mdb_entry *mp; | |
eb1d1641 HX |
181 | int maxlen; |
182 | int len; | |
183 | int i; | |
184 | ||
185 | for (i = 0; i < old->max; i++) | |
b67bfe0d | 186 | hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver]) |
eb1d1641 | 187 | hlist_add_head(&mp->hlist[new->ver], |
8ef2a9a5 | 188 | &new->mhash[br_ip_hash(new, &mp->addr)]); |
eb1d1641 HX |
189 | |
190 | if (!elasticity) | |
191 | return 0; | |
192 | ||
193 | maxlen = 0; | |
194 | for (i = 0; i < new->max; i++) { | |
195 | len = 0; | |
b67bfe0d | 196 | hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver]) |
eb1d1641 HX |
197 | len++; |
198 | if (len > maxlen) | |
199 | maxlen = len; | |
200 | } | |
201 | ||
202 | return maxlen > elasticity ? -EINVAL : 0; | |
203 | } | |
204 | ||
cfd56754 | 205 | void br_multicast_free_pg(struct rcu_head *head) |
eb1d1641 HX |
206 | { |
207 | struct net_bridge_port_group *p = | |
208 | container_of(head, struct net_bridge_port_group, rcu); | |
209 | ||
210 | kfree(p); | |
211 | } | |
212 | ||
213 | static void br_multicast_free_group(struct rcu_head *head) | |
214 | { | |
215 | struct net_bridge_mdb_entry *mp = | |
216 | container_of(head, struct net_bridge_mdb_entry, rcu); | |
217 | ||
218 | kfree(mp); | |
219 | } | |
220 | ||
221 | static void br_multicast_group_expired(unsigned long data) | |
222 | { | |
223 | struct net_bridge_mdb_entry *mp = (void *)data; | |
224 | struct net_bridge *br = mp->br; | |
225 | struct net_bridge_mdb_htable *mdb; | |
226 | ||
227 | spin_lock(&br->multicast_lock); | |
228 | if (!netif_running(br->dev) || timer_pending(&mp->timer)) | |
229 | goto out; | |
230 | ||
8a870178 | 231 | mp->mglist = false; |
eb1d1641 HX |
232 | |
233 | if (mp->ports) | |
234 | goto out; | |
235 | ||
e8051688 ED |
236 | mdb = mlock_dereference(br->mdb, br); |
237 | ||
eb1d1641 HX |
238 | hlist_del_rcu(&mp->hlist[mdb->ver]); |
239 | mdb->size--; | |
240 | ||
eb1d1641 HX |
241 | call_rcu_bh(&mp->rcu, br_multicast_free_group); |
242 | ||
243 | out: | |
244 | spin_unlock(&br->multicast_lock); | |
245 | } | |
246 | ||
247 | static void br_multicast_del_pg(struct net_bridge *br, | |
248 | struct net_bridge_port_group *pg) | |
249 | { | |
e8051688 | 250 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 HX |
251 | struct net_bridge_mdb_entry *mp; |
252 | struct net_bridge_port_group *p; | |
e8051688 ED |
253 | struct net_bridge_port_group __rcu **pp; |
254 | ||
255 | mdb = mlock_dereference(br->mdb, br); | |
eb1d1641 | 256 | |
8ef2a9a5 | 257 | mp = br_mdb_ip_get(mdb, &pg->addr); |
eb1d1641 HX |
258 | if (WARN_ON(!mp)) |
259 | return; | |
260 | ||
e8051688 ED |
261 | for (pp = &mp->ports; |
262 | (p = mlock_dereference(*pp, br)) != NULL; | |
263 | pp = &p->next) { | |
eb1d1641 HX |
264 | if (p != pg) |
265 | continue; | |
266 | ||
83f6a740 | 267 | rcu_assign_pointer(*pp, p->next); |
eb1d1641 HX |
268 | hlist_del_init(&p->mglist); |
269 | del_timer(&p->timer); | |
eb1d1641 HX |
270 | call_rcu_bh(&p->rcu, br_multicast_free_pg); |
271 | ||
8a870178 | 272 | if (!mp->ports && !mp->mglist && |
eb1d1641 HX |
273 | netif_running(br->dev)) |
274 | mod_timer(&mp->timer, jiffies); | |
275 | ||
276 | return; | |
277 | } | |
278 | ||
279 | WARN_ON(1); | |
280 | } | |
281 | ||
282 | static void br_multicast_port_group_expired(unsigned long data) | |
283 | { | |
284 | struct net_bridge_port_group *pg = (void *)data; | |
285 | struct net_bridge *br = pg->port->br; | |
286 | ||
287 | spin_lock(&br->multicast_lock); | |
288 | if (!netif_running(br->dev) || timer_pending(&pg->timer) || | |
ccb1c31a | 289 | hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT) |
eb1d1641 HX |
290 | goto out; |
291 | ||
292 | br_multicast_del_pg(br, pg); | |
293 | ||
294 | out: | |
295 | spin_unlock(&br->multicast_lock); | |
296 | } | |
297 | ||
e8051688 | 298 | static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max, |
eb1d1641 HX |
299 | int elasticity) |
300 | { | |
e8051688 | 301 | struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1); |
eb1d1641 HX |
302 | struct net_bridge_mdb_htable *mdb; |
303 | int err; | |
304 | ||
305 | mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC); | |
306 | if (!mdb) | |
307 | return -ENOMEM; | |
308 | ||
309 | mdb->max = max; | |
310 | mdb->old = old; | |
311 | ||
312 | mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC); | |
313 | if (!mdb->mhash) { | |
314 | kfree(mdb); | |
315 | return -ENOMEM; | |
316 | } | |
317 | ||
318 | mdb->size = old ? old->size : 0; | |
319 | mdb->ver = old ? old->ver ^ 1 : 0; | |
320 | ||
321 | if (!old || elasticity) | |
322 | get_random_bytes(&mdb->secret, sizeof(mdb->secret)); | |
323 | else | |
324 | mdb->secret = old->secret; | |
325 | ||
326 | if (!old) | |
327 | goto out; | |
328 | ||
329 | err = br_mdb_copy(mdb, old, elasticity); | |
330 | if (err) { | |
331 | kfree(mdb->mhash); | |
332 | kfree(mdb); | |
333 | return err; | |
334 | } | |
335 | ||
2ce297fc | 336 | br_mdb_rehash_seq++; |
eb1d1641 HX |
337 | call_rcu_bh(&mdb->rcu, br_mdb_free); |
338 | ||
339 | out: | |
340 | rcu_assign_pointer(*mdbp, mdb); | |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
8ef2a9a5 YH |
345 | static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br, |
346 | __be32 group) | |
eb1d1641 HX |
347 | { |
348 | struct sk_buff *skb; | |
349 | struct igmphdr *ih; | |
350 | struct ethhdr *eth; | |
351 | struct iphdr *iph; | |
352 | ||
353 | skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) + | |
354 | sizeof(*ih) + 4); | |
355 | if (!skb) | |
356 | goto out; | |
357 | ||
358 | skb->protocol = htons(ETH_P_IP); | |
359 | ||
360 | skb_reset_mac_header(skb); | |
361 | eth = eth_hdr(skb); | |
362 | ||
363 | memcpy(eth->h_source, br->dev->dev_addr, 6); | |
364 | eth->h_dest[0] = 1; | |
365 | eth->h_dest[1] = 0; | |
366 | eth->h_dest[2] = 0x5e; | |
367 | eth->h_dest[3] = 0; | |
368 | eth->h_dest[4] = 0; | |
369 | eth->h_dest[5] = 1; | |
370 | eth->h_proto = htons(ETH_P_IP); | |
371 | skb_put(skb, sizeof(*eth)); | |
372 | ||
373 | skb_set_network_header(skb, skb->len); | |
374 | iph = ip_hdr(skb); | |
375 | ||
376 | iph->version = 4; | |
377 | iph->ihl = 6; | |
378 | iph->tos = 0xc0; | |
379 | iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4); | |
380 | iph->id = 0; | |
381 | iph->frag_off = htons(IP_DF); | |
382 | iph->ttl = 1; | |
383 | iph->protocol = IPPROTO_IGMP; | |
384 | iph->saddr = 0; | |
385 | iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); | |
386 | ((u8 *)&iph[1])[0] = IPOPT_RA; | |
387 | ((u8 *)&iph[1])[1] = 4; | |
388 | ((u8 *)&iph[1])[2] = 0; | |
389 | ((u8 *)&iph[1])[3] = 0; | |
390 | ip_send_check(iph); | |
391 | skb_put(skb, 24); | |
392 | ||
393 | skb_set_transport_header(skb, skb->len); | |
394 | ih = igmp_hdr(skb); | |
395 | ih->type = IGMP_HOST_MEMBERSHIP_QUERY; | |
396 | ih->code = (group ? br->multicast_last_member_interval : | |
397 | br->multicast_query_response_interval) / | |
398 | (HZ / IGMP_TIMER_SCALE); | |
399 | ih->group = group; | |
400 | ih->csum = 0; | |
401 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
402 | skb_put(skb, sizeof(*ih)); | |
403 | ||
404 | __skb_pull(skb, sizeof(*eth)); | |
405 | ||
406 | out: | |
407 | return skb; | |
408 | } | |
409 | ||
dfd56b8b | 410 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 411 | static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, |
b71d1d42 | 412 | const struct in6_addr *group) |
08b202b6 YH |
413 | { |
414 | struct sk_buff *skb; | |
415 | struct ipv6hdr *ip6h; | |
416 | struct mld_msg *mldq; | |
417 | struct ethhdr *eth; | |
418 | u8 *hopopt; | |
419 | unsigned long interval; | |
420 | ||
421 | skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) + | |
422 | 8 + sizeof(*mldq)); | |
423 | if (!skb) | |
424 | goto out; | |
425 | ||
426 | skb->protocol = htons(ETH_P_IPV6); | |
427 | ||
428 | /* Ethernet header */ | |
429 | skb_reset_mac_header(skb); | |
430 | eth = eth_hdr(skb); | |
431 | ||
432 | memcpy(eth->h_source, br->dev->dev_addr, 6); | |
08b202b6 YH |
433 | eth->h_proto = htons(ETH_P_IPV6); |
434 | skb_put(skb, sizeof(*eth)); | |
435 | ||
436 | /* IPv6 header + HbH option */ | |
437 | skb_set_network_header(skb, skb->len); | |
438 | ip6h = ipv6_hdr(skb); | |
439 | ||
440 | *(__force __be32 *)ip6h = htonl(0x60000000); | |
76d66158 | 441 | ip6h->payload_len = htons(8 + sizeof(*mldq)); |
08b202b6 YH |
442 | ip6h->nexthdr = IPPROTO_HOPOPTS; |
443 | ip6h->hop_limit = 1; | |
a7bff75b | 444 | ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1)); |
d1d81d4c UW |
445 | if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0, |
446 | &ip6h->saddr)) { | |
447 | kfree_skb(skb); | |
448 | return NULL; | |
449 | } | |
36cff5a1 | 450 | ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); |
08b202b6 YH |
451 | |
452 | hopopt = (u8 *)(ip6h + 1); | |
453 | hopopt[0] = IPPROTO_ICMPV6; /* next hdr */ | |
454 | hopopt[1] = 0; /* length of HbH */ | |
455 | hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */ | |
456 | hopopt[3] = 2; /* Length of RA Option */ | |
457 | hopopt[4] = 0; /* Type = 0x0000 (MLD) */ | |
458 | hopopt[5] = 0; | |
1de5a71c EZ |
459 | hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */ |
460 | hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */ | |
08b202b6 YH |
461 | |
462 | skb_put(skb, sizeof(*ip6h) + 8); | |
463 | ||
464 | /* ICMPv6 */ | |
465 | skb_set_transport_header(skb, skb->len); | |
466 | mldq = (struct mld_msg *) icmp6_hdr(skb); | |
467 | ||
32de868c LL |
468 | interval = ipv6_addr_any(group) ? |
469 | br->multicast_query_response_interval : | |
470 | br->multicast_last_member_interval; | |
08b202b6 YH |
471 | |
472 | mldq->mld_type = ICMPV6_MGM_QUERY; | |
473 | mldq->mld_code = 0; | |
474 | mldq->mld_cksum = 0; | |
475 | mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); | |
476 | mldq->mld_reserved = 0; | |
4e3fd7a0 | 477 | mldq->mld_mca = *group; |
08b202b6 YH |
478 | |
479 | /* checksum */ | |
480 | mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
481 | sizeof(*mldq), IPPROTO_ICMPV6, | |
482 | csum_partial(mldq, | |
483 | sizeof(*mldq), 0)); | |
484 | skb_put(skb, sizeof(*mldq)); | |
485 | ||
486 | __skb_pull(skb, sizeof(*eth)); | |
487 | ||
488 | out: | |
489 | return skb; | |
490 | } | |
491 | #endif | |
492 | ||
8ef2a9a5 YH |
493 | static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, |
494 | struct br_ip *addr) | |
495 | { | |
496 | switch (addr->proto) { | |
497 | case htons(ETH_P_IP): | |
498 | return br_ip4_multicast_alloc_query(br, addr->u.ip4); | |
dfd56b8b | 499 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
500 | case htons(ETH_P_IPV6): |
501 | return br_ip6_multicast_alloc_query(br, &addr->u.ip6); | |
502 | #endif | |
8ef2a9a5 YH |
503 | } |
504 | return NULL; | |
505 | } | |
506 | ||
eb1d1641 | 507 | static struct net_bridge_mdb_entry *br_multicast_get_group( |
8ef2a9a5 YH |
508 | struct net_bridge *br, struct net_bridge_port *port, |
509 | struct br_ip *group, int hash) | |
eb1d1641 | 510 | { |
e8051688 | 511 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 | 512 | struct net_bridge_mdb_entry *mp; |
95c96174 ED |
513 | unsigned int count = 0; |
514 | unsigned int max; | |
eb1d1641 HX |
515 | int elasticity; |
516 | int err; | |
517 | ||
e8051688 | 518 | mdb = rcu_dereference_protected(br->mdb, 1); |
b67bfe0d | 519 | hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) { |
eb1d1641 | 520 | count++; |
8ef2a9a5 | 521 | if (unlikely(br_ip_equal(group, &mp->addr))) |
eb1d1641 | 522 | return mp; |
eb1d1641 HX |
523 | } |
524 | ||
525 | elasticity = 0; | |
526 | max = mdb->max; | |
527 | ||
528 | if (unlikely(count > br->hash_elasticity && count)) { | |
529 | if (net_ratelimit()) | |
28a16c97 | 530 | br_info(br, "Multicast hash table " |
531 | "chain limit reached: %s\n", | |
532 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
533 | |
534 | elasticity = br->hash_elasticity; | |
535 | } | |
536 | ||
537 | if (mdb->size >= max) { | |
538 | max *= 2; | |
036be6db TG |
539 | if (unlikely(max > br->hash_max)) { |
540 | br_warn(br, "Multicast hash table maximum of %d " | |
541 | "reached, disabling snooping: %s\n", | |
542 | br->hash_max, | |
543 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
544 | err = -E2BIG; |
545 | disable: | |
546 | br->multicast_disabled = 1; | |
547 | goto err; | |
548 | } | |
549 | } | |
550 | ||
551 | if (max > mdb->max || elasticity) { | |
552 | if (mdb->old) { | |
553 | if (net_ratelimit()) | |
28a16c97 | 554 | br_info(br, "Multicast hash table " |
555 | "on fire: %s\n", | |
556 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
557 | err = -EEXIST; |
558 | goto err; | |
559 | } | |
560 | ||
561 | err = br_mdb_rehash(&br->mdb, max, elasticity); | |
562 | if (err) { | |
28a16c97 | 563 | br_warn(br, "Cannot rehash multicast " |
564 | "hash table, disabling snooping: %s, %d, %d\n", | |
565 | port ? port->dev->name : br->dev->name, | |
566 | mdb->size, err); | |
eb1d1641 HX |
567 | goto disable; |
568 | } | |
569 | ||
570 | err = -EAGAIN; | |
571 | goto err; | |
572 | } | |
573 | ||
574 | return NULL; | |
575 | ||
576 | err: | |
577 | mp = ERR_PTR(err); | |
578 | return mp; | |
579 | } | |
580 | ||
cfd56754 CW |
581 | struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br, |
582 | struct net_bridge_port *port, struct br_ip *group) | |
eb1d1641 | 583 | { |
e8051688 | 584 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 HX |
585 | struct net_bridge_mdb_entry *mp; |
586 | int hash; | |
4c0833bc | 587 | int err; |
eb1d1641 | 588 | |
e8051688 | 589 | mdb = rcu_dereference_protected(br->mdb, 1); |
eb1d1641 | 590 | if (!mdb) { |
4c0833bc TK |
591 | err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0); |
592 | if (err) | |
593 | return ERR_PTR(err); | |
eb1d1641 HX |
594 | goto rehash; |
595 | } | |
596 | ||
597 | hash = br_ip_hash(mdb, group); | |
598 | mp = br_multicast_get_group(br, port, group, hash); | |
599 | switch (PTR_ERR(mp)) { | |
600 | case 0: | |
601 | break; | |
602 | ||
603 | case -EAGAIN: | |
604 | rehash: | |
e8051688 | 605 | mdb = rcu_dereference_protected(br->mdb, 1); |
eb1d1641 HX |
606 | hash = br_ip_hash(mdb, group); |
607 | break; | |
608 | ||
609 | default: | |
610 | goto out; | |
611 | } | |
612 | ||
613 | mp = kzalloc(sizeof(*mp), GFP_ATOMIC); | |
614 | if (unlikely(!mp)) | |
4c0833bc | 615 | return ERR_PTR(-ENOMEM); |
eb1d1641 HX |
616 | |
617 | mp->br = br; | |
8ef2a9a5 | 618 | mp->addr = *group; |
eb1d1641 HX |
619 | setup_timer(&mp->timer, br_multicast_group_expired, |
620 | (unsigned long)mp); | |
eb1d1641 HX |
621 | |
622 | hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]); | |
623 | mdb->size++; | |
624 | ||
625 | out: | |
626 | return mp; | |
627 | } | |
628 | ||
cfd56754 CW |
629 | struct net_bridge_port_group *br_multicast_new_port_group( |
630 | struct net_bridge_port *port, | |
631 | struct br_ip *group, | |
ccb1c31a AW |
632 | struct net_bridge_port_group __rcu *next, |
633 | unsigned char state) | |
cfd56754 CW |
634 | { |
635 | struct net_bridge_port_group *p; | |
636 | ||
637 | p = kzalloc(sizeof(*p), GFP_ATOMIC); | |
638 | if (unlikely(!p)) | |
639 | return NULL; | |
640 | ||
641 | p->addr = *group; | |
642 | p->port = port; | |
ccb1c31a | 643 | p->state = state; |
eca2a43b | 644 | rcu_assign_pointer(p->next, next); |
cfd56754 CW |
645 | hlist_add_head(&p->mglist, &port->mglist); |
646 | setup_timer(&p->timer, br_multicast_port_group_expired, | |
647 | (unsigned long)p); | |
648 | return p; | |
649 | } | |
650 | ||
eb1d1641 | 651 | static int br_multicast_add_group(struct net_bridge *br, |
8ef2a9a5 YH |
652 | struct net_bridge_port *port, |
653 | struct br_ip *group) | |
eb1d1641 HX |
654 | { |
655 | struct net_bridge_mdb_entry *mp; | |
656 | struct net_bridge_port_group *p; | |
e8051688 | 657 | struct net_bridge_port_group __rcu **pp; |
eb1d1641 HX |
658 | unsigned long now = jiffies; |
659 | int err; | |
660 | ||
eb1d1641 HX |
661 | spin_lock(&br->multicast_lock); |
662 | if (!netif_running(br->dev) || | |
663 | (port && port->state == BR_STATE_DISABLED)) | |
664 | goto out; | |
665 | ||
666 | mp = br_multicast_new_group(br, port, group); | |
667 | err = PTR_ERR(mp); | |
4c0833bc | 668 | if (IS_ERR(mp)) |
eb1d1641 HX |
669 | goto err; |
670 | ||
671 | if (!port) { | |
8a870178 | 672 | mp->mglist = true; |
eb1d1641 HX |
673 | mod_timer(&mp->timer, now + br->multicast_membership_interval); |
674 | goto out; | |
675 | } | |
676 | ||
e8051688 ED |
677 | for (pp = &mp->ports; |
678 | (p = mlock_dereference(*pp, br)) != NULL; | |
679 | pp = &p->next) { | |
eb1d1641 HX |
680 | if (p->port == port) |
681 | goto found; | |
682 | if ((unsigned long)p->port < (unsigned long)port) | |
683 | break; | |
684 | } | |
685 | ||
ccb1c31a | 686 | p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY); |
eb1d1641 HX |
687 | if (unlikely(!p)) |
688 | goto err; | |
eb1d1641 | 689 | rcu_assign_pointer(*pp, p); |
37a393bc | 690 | br_mdb_notify(br->dev, port, group, RTM_NEWMDB); |
eb1d1641 HX |
691 | |
692 | found: | |
693 | mod_timer(&p->timer, now + br->multicast_membership_interval); | |
694 | out: | |
695 | err = 0; | |
696 | ||
697 | err: | |
698 | spin_unlock(&br->multicast_lock); | |
699 | return err; | |
700 | } | |
701 | ||
8ef2a9a5 YH |
702 | static int br_ip4_multicast_add_group(struct net_bridge *br, |
703 | struct net_bridge_port *port, | |
b0e9a30d VY |
704 | __be32 group, |
705 | __u16 vid) | |
8ef2a9a5 YH |
706 | { |
707 | struct br_ip br_group; | |
708 | ||
709 | if (ipv4_is_local_multicast(group)) | |
710 | return 0; | |
711 | ||
712 | br_group.u.ip4 = group; | |
713 | br_group.proto = htons(ETH_P_IP); | |
b0e9a30d | 714 | br_group.vid = vid; |
8ef2a9a5 YH |
715 | |
716 | return br_multicast_add_group(br, port, &br_group); | |
717 | } | |
718 | ||
dfd56b8b | 719 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
720 | static int br_ip6_multicast_add_group(struct net_bridge *br, |
721 | struct net_bridge_port *port, | |
b0e9a30d VY |
722 | const struct in6_addr *group, |
723 | __u16 vid) | |
08b202b6 YH |
724 | { |
725 | struct br_ip br_group; | |
726 | ||
e4de9f9e | 727 | if (!ipv6_is_transient_multicast(group)) |
08b202b6 YH |
728 | return 0; |
729 | ||
4e3fd7a0 | 730 | br_group.u.ip6 = *group; |
9cc6e0c4 | 731 | br_group.proto = htons(ETH_P_IPV6); |
b0e9a30d | 732 | br_group.vid = vid; |
08b202b6 YH |
733 | |
734 | return br_multicast_add_group(br, port, &br_group); | |
735 | } | |
736 | #endif | |
737 | ||
eb1d1641 HX |
738 | static void br_multicast_router_expired(unsigned long data) |
739 | { | |
740 | struct net_bridge_port *port = (void *)data; | |
741 | struct net_bridge *br = port->br; | |
742 | ||
743 | spin_lock(&br->multicast_lock); | |
744 | if (port->multicast_router != 1 || | |
745 | timer_pending(&port->multicast_router_timer) || | |
746 | hlist_unhashed(&port->rlist)) | |
747 | goto out; | |
748 | ||
749 | hlist_del_init_rcu(&port->rlist); | |
750 | ||
751 | out: | |
752 | spin_unlock(&br->multicast_lock); | |
753 | } | |
754 | ||
755 | static void br_multicast_local_router_expired(unsigned long data) | |
756 | { | |
757 | } | |
758 | ||
c83b8fab HX |
759 | static void br_multicast_querier_expired(unsigned long data) |
760 | { | |
bb63f1f8 | 761 | struct net_bridge *br = (void *)data; |
c83b8fab HX |
762 | |
763 | spin_lock(&br->multicast_lock); | |
764 | if (!netif_running(br->dev) || br->multicast_disabled) | |
765 | goto out; | |
766 | ||
767 | br_multicast_start_querier(br); | |
768 | ||
769 | out: | |
770 | spin_unlock(&br->multicast_lock); | |
771 | } | |
772 | ||
8ef2a9a5 YH |
773 | static void __br_multicast_send_query(struct net_bridge *br, |
774 | struct net_bridge_port *port, | |
775 | struct br_ip *ip) | |
eb1d1641 | 776 | { |
eb1d1641 HX |
777 | struct sk_buff *skb; |
778 | ||
8ef2a9a5 | 779 | skb = br_multicast_alloc_query(br, ip); |
eb1d1641 | 780 | if (!skb) |
8ef2a9a5 | 781 | return; |
eb1d1641 HX |
782 | |
783 | if (port) { | |
784 | __skb_push(skb, sizeof(struct ethhdr)); | |
785 | skb->dev = port->dev; | |
713aefa3 | 786 | NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, |
eb1d1641 HX |
787 | dev_queue_xmit); |
788 | } else | |
789 | netif_rx(skb); | |
8ef2a9a5 YH |
790 | } |
791 | ||
792 | static void br_multicast_send_query(struct net_bridge *br, | |
793 | struct net_bridge_port *port, u32 sent) | |
794 | { | |
795 | unsigned long time; | |
796 | struct br_ip br_group; | |
797 | ||
798 | if (!netif_running(br->dev) || br->multicast_disabled || | |
c5c23260 | 799 | !br->multicast_querier || |
8ef2a9a5 YH |
800 | timer_pending(&br->multicast_querier_timer)) |
801 | return; | |
802 | ||
08b202b6 YH |
803 | memset(&br_group.u, 0, sizeof(br_group.u)); |
804 | ||
8ef2a9a5 | 805 | br_group.proto = htons(ETH_P_IP); |
08b202b6 | 806 | __br_multicast_send_query(br, port, &br_group); |
8ef2a9a5 | 807 | |
dfd56b8b | 808 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 809 | br_group.proto = htons(ETH_P_IPV6); |
8ef2a9a5 | 810 | __br_multicast_send_query(br, port, &br_group); |
08b202b6 | 811 | #endif |
eb1d1641 | 812 | |
eb1d1641 HX |
813 | time = jiffies; |
814 | time += sent < br->multicast_startup_query_count ? | |
815 | br->multicast_startup_query_interval : | |
816 | br->multicast_query_interval; | |
817 | mod_timer(port ? &port->multicast_query_timer : | |
818 | &br->multicast_query_timer, time); | |
819 | } | |
820 | ||
821 | static void br_multicast_port_query_expired(unsigned long data) | |
822 | { | |
823 | struct net_bridge_port *port = (void *)data; | |
824 | struct net_bridge *br = port->br; | |
825 | ||
826 | spin_lock(&br->multicast_lock); | |
02a780c0 DC |
827 | if (port->state == BR_STATE_DISABLED || |
828 | port->state == BR_STATE_BLOCKING) | |
eb1d1641 HX |
829 | goto out; |
830 | ||
831 | if (port->multicast_startup_queries_sent < | |
832 | br->multicast_startup_query_count) | |
833 | port->multicast_startup_queries_sent++; | |
834 | ||
835 | br_multicast_send_query(port->br, port, | |
836 | port->multicast_startup_queries_sent); | |
837 | ||
838 | out: | |
839 | spin_unlock(&br->multicast_lock); | |
840 | } | |
841 | ||
842 | void br_multicast_add_port(struct net_bridge_port *port) | |
843 | { | |
844 | port->multicast_router = 1; | |
845 | ||
846 | setup_timer(&port->multicast_router_timer, br_multicast_router_expired, | |
847 | (unsigned long)port); | |
848 | setup_timer(&port->multicast_query_timer, | |
849 | br_multicast_port_query_expired, (unsigned long)port); | |
850 | } | |
851 | ||
852 | void br_multicast_del_port(struct net_bridge_port *port) | |
853 | { | |
854 | del_timer_sync(&port->multicast_router_timer); | |
855 | } | |
856 | ||
561f1103 HX |
857 | static void __br_multicast_enable_port(struct net_bridge_port *port) |
858 | { | |
859 | port->multicast_startup_queries_sent = 0; | |
860 | ||
861 | if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 || | |
862 | del_timer(&port->multicast_query_timer)) | |
863 | mod_timer(&port->multicast_query_timer, jiffies); | |
864 | } | |
865 | ||
eb1d1641 HX |
866 | void br_multicast_enable_port(struct net_bridge_port *port) |
867 | { | |
868 | struct net_bridge *br = port->br; | |
869 | ||
870 | spin_lock(&br->multicast_lock); | |
871 | if (br->multicast_disabled || !netif_running(br->dev)) | |
872 | goto out; | |
873 | ||
561f1103 | 874 | __br_multicast_enable_port(port); |
eb1d1641 HX |
875 | |
876 | out: | |
877 | spin_unlock(&br->multicast_lock); | |
878 | } | |
879 | ||
880 | void br_multicast_disable_port(struct net_bridge_port *port) | |
881 | { | |
882 | struct net_bridge *br = port->br; | |
883 | struct net_bridge_port_group *pg; | |
b67bfe0d | 884 | struct hlist_node *n; |
eb1d1641 HX |
885 | |
886 | spin_lock(&br->multicast_lock); | |
b67bfe0d | 887 | hlist_for_each_entry_safe(pg, n, &port->mglist, mglist) |
eb1d1641 HX |
888 | br_multicast_del_pg(br, pg); |
889 | ||
890 | if (!hlist_unhashed(&port->rlist)) | |
891 | hlist_del_init_rcu(&port->rlist); | |
892 | del_timer(&port->multicast_router_timer); | |
893 | del_timer(&port->multicast_query_timer); | |
894 | spin_unlock(&br->multicast_lock); | |
895 | } | |
896 | ||
8ef2a9a5 YH |
897 | static int br_ip4_multicast_igmp3_report(struct net_bridge *br, |
898 | struct net_bridge_port *port, | |
899 | struct sk_buff *skb) | |
eb1d1641 HX |
900 | { |
901 | struct igmpv3_report *ih; | |
902 | struct igmpv3_grec *grec; | |
903 | int i; | |
904 | int len; | |
905 | int num; | |
906 | int type; | |
907 | int err = 0; | |
908 | __be32 group; | |
b0e9a30d | 909 | u16 vid = 0; |
eb1d1641 HX |
910 | |
911 | if (!pskb_may_pull(skb, sizeof(*ih))) | |
912 | return -EINVAL; | |
913 | ||
b0e9a30d | 914 | br_vlan_get_tag(skb, &vid); |
eb1d1641 HX |
915 | ih = igmpv3_report_hdr(skb); |
916 | num = ntohs(ih->ngrec); | |
917 | len = sizeof(*ih); | |
918 | ||
919 | for (i = 0; i < num; i++) { | |
920 | len += sizeof(*grec); | |
921 | if (!pskb_may_pull(skb, len)) | |
922 | return -EINVAL; | |
923 | ||
fd218cf9 | 924 | grec = (void *)(skb->data + len - sizeof(*grec)); |
eb1d1641 HX |
925 | group = grec->grec_mca; |
926 | type = grec->grec_type; | |
927 | ||
8eabf95c | 928 | len += ntohs(grec->grec_nsrcs) * 4; |
eb1d1641 HX |
929 | if (!pskb_may_pull(skb, len)) |
930 | return -EINVAL; | |
931 | ||
932 | /* We treat this as an IGMPv2 report for now. */ | |
933 | switch (type) { | |
934 | case IGMPV3_MODE_IS_INCLUDE: | |
935 | case IGMPV3_MODE_IS_EXCLUDE: | |
936 | case IGMPV3_CHANGE_TO_INCLUDE: | |
937 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
938 | case IGMPV3_ALLOW_NEW_SOURCES: | |
939 | case IGMPV3_BLOCK_OLD_SOURCES: | |
940 | break; | |
941 | ||
942 | default: | |
943 | continue; | |
944 | } | |
945 | ||
b0e9a30d | 946 | err = br_ip4_multicast_add_group(br, port, group, vid); |
eb1d1641 HX |
947 | if (err) |
948 | break; | |
949 | } | |
950 | ||
951 | return err; | |
952 | } | |
953 | ||
dfd56b8b | 954 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
955 | static int br_ip6_multicast_mld2_report(struct net_bridge *br, |
956 | struct net_bridge_port *port, | |
957 | struct sk_buff *skb) | |
958 | { | |
959 | struct icmp6hdr *icmp6h; | |
960 | struct mld2_grec *grec; | |
961 | int i; | |
962 | int len; | |
963 | int num; | |
964 | int err = 0; | |
b0e9a30d | 965 | u16 vid = 0; |
08b202b6 YH |
966 | |
967 | if (!pskb_may_pull(skb, sizeof(*icmp6h))) | |
968 | return -EINVAL; | |
969 | ||
b0e9a30d | 970 | br_vlan_get_tag(skb, &vid); |
08b202b6 YH |
971 | icmp6h = icmp6_hdr(skb); |
972 | num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); | |
973 | len = sizeof(*icmp6h); | |
974 | ||
975 | for (i = 0; i < num; i++) { | |
976 | __be16 *nsrcs, _nsrcs; | |
977 | ||
978 | nsrcs = skb_header_pointer(skb, | |
979 | len + offsetof(struct mld2_grec, | |
649e984d | 980 | grec_nsrcs), |
08b202b6 YH |
981 | sizeof(_nsrcs), &_nsrcs); |
982 | if (!nsrcs) | |
983 | return -EINVAL; | |
984 | ||
985 | if (!pskb_may_pull(skb, | |
986 | len + sizeof(*grec) + | |
d41db9f3 | 987 | sizeof(struct in6_addr) * ntohs(*nsrcs))) |
08b202b6 YH |
988 | return -EINVAL; |
989 | ||
990 | grec = (struct mld2_grec *)(skb->data + len); | |
d41db9f3 LL |
991 | len += sizeof(*grec) + |
992 | sizeof(struct in6_addr) * ntohs(*nsrcs); | |
08b202b6 YH |
993 | |
994 | /* We treat these as MLDv1 reports for now. */ | |
995 | switch (grec->grec_type) { | |
996 | case MLD2_MODE_IS_INCLUDE: | |
997 | case MLD2_MODE_IS_EXCLUDE: | |
998 | case MLD2_CHANGE_TO_INCLUDE: | |
999 | case MLD2_CHANGE_TO_EXCLUDE: | |
1000 | case MLD2_ALLOW_NEW_SOURCES: | |
1001 | case MLD2_BLOCK_OLD_SOURCES: | |
1002 | break; | |
1003 | ||
1004 | default: | |
1005 | continue; | |
1006 | } | |
1007 | ||
b0e9a30d VY |
1008 | err = br_ip6_multicast_add_group(br, port, &grec->grec_mca, |
1009 | vid); | |
08b202b6 YH |
1010 | if (!err) |
1011 | break; | |
1012 | } | |
1013 | ||
1014 | return err; | |
1015 | } | |
1016 | #endif | |
1017 | ||
7e80c124 | 1018 | /* |
1019 | * Add port to rotuer_list | |
1020 | * list is maintained ordered by pointer value | |
1021 | * and locked by br->multicast_lock and RCU | |
1022 | */ | |
0909e117 HX |
1023 | static void br_multicast_add_router(struct net_bridge *br, |
1024 | struct net_bridge_port *port) | |
1025 | { | |
dcdca2c4 | 1026 | struct net_bridge_port *p; |
b67bfe0d | 1027 | struct hlist_node *slot = NULL; |
dcdca2c4 | 1028 | |
b67bfe0d | 1029 | hlist_for_each_entry(p, &br->router_list, rlist) { |
7e80c124 | 1030 | if ((unsigned long) port >= (unsigned long) p) |
1031 | break; | |
b67bfe0d | 1032 | slot = &p->rlist; |
dcdca2c4 | 1033 | } |
1034 | ||
7e80c124 | 1035 | if (slot) |
1036 | hlist_add_after_rcu(slot, &port->rlist); | |
dcdca2c4 | 1037 | else |
1038 | hlist_add_head_rcu(&port->rlist, &br->router_list); | |
0909e117 HX |
1039 | } |
1040 | ||
eb1d1641 HX |
1041 | static void br_multicast_mark_router(struct net_bridge *br, |
1042 | struct net_bridge_port *port) | |
1043 | { | |
1044 | unsigned long now = jiffies; | |
eb1d1641 HX |
1045 | |
1046 | if (!port) { | |
1047 | if (br->multicast_router == 1) | |
1048 | mod_timer(&br->multicast_router_timer, | |
1049 | now + br->multicast_querier_interval); | |
1050 | return; | |
1051 | } | |
1052 | ||
1053 | if (port->multicast_router != 1) | |
1054 | return; | |
1055 | ||
1056 | if (!hlist_unhashed(&port->rlist)) | |
1057 | goto timer; | |
1058 | ||
0909e117 | 1059 | br_multicast_add_router(br, port); |
eb1d1641 HX |
1060 | |
1061 | timer: | |
1062 | mod_timer(&port->multicast_router_timer, | |
1063 | now + br->multicast_querier_interval); | |
1064 | } | |
1065 | ||
1066 | static void br_multicast_query_received(struct net_bridge *br, | |
1067 | struct net_bridge_port *port, | |
8ef2a9a5 | 1068 | int saddr) |
eb1d1641 HX |
1069 | { |
1070 | if (saddr) | |
1071 | mod_timer(&br->multicast_querier_timer, | |
1072 | jiffies + br->multicast_querier_interval); | |
1073 | else if (timer_pending(&br->multicast_querier_timer)) | |
1074 | return; | |
1075 | ||
1076 | br_multicast_mark_router(br, port); | |
1077 | } | |
1078 | ||
8ef2a9a5 YH |
1079 | static int br_ip4_multicast_query(struct net_bridge *br, |
1080 | struct net_bridge_port *port, | |
1081 | struct sk_buff *skb) | |
eb1d1641 | 1082 | { |
b71d1d42 | 1083 | const struct iphdr *iph = ip_hdr(skb); |
eb1d1641 HX |
1084 | struct igmphdr *ih = igmp_hdr(skb); |
1085 | struct net_bridge_mdb_entry *mp; | |
1086 | struct igmpv3_query *ih3; | |
1087 | struct net_bridge_port_group *p; | |
e8051688 | 1088 | struct net_bridge_port_group __rcu **pp; |
eb1d1641 HX |
1089 | unsigned long max_delay; |
1090 | unsigned long now = jiffies; | |
1091 | __be32 group; | |
bec68ff1 | 1092 | int err = 0; |
b0e9a30d | 1093 | u16 vid = 0; |
eb1d1641 HX |
1094 | |
1095 | spin_lock(&br->multicast_lock); | |
1096 | if (!netif_running(br->dev) || | |
1097 | (port && port->state == BR_STATE_DISABLED)) | |
1098 | goto out; | |
1099 | ||
8ef2a9a5 | 1100 | br_multicast_query_received(br, port, !!iph->saddr); |
eb1d1641 HX |
1101 | |
1102 | group = ih->group; | |
1103 | ||
1104 | if (skb->len == sizeof(*ih)) { | |
1105 | max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); | |
1106 | ||
1107 | if (!max_delay) { | |
1108 | max_delay = 10 * HZ; | |
1109 | group = 0; | |
1110 | } | |
1111 | } else { | |
bec68ff1 YH |
1112 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) { |
1113 | err = -EINVAL; | |
1114 | goto out; | |
1115 | } | |
eb1d1641 HX |
1116 | |
1117 | ih3 = igmpv3_query_hdr(skb); | |
1118 | if (ih3->nsrcs) | |
bec68ff1 | 1119 | goto out; |
eb1d1641 | 1120 | |
0ba8c9ec YH |
1121 | max_delay = ih3->code ? |
1122 | IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; | |
eb1d1641 HX |
1123 | } |
1124 | ||
1125 | if (!group) | |
1126 | goto out; | |
1127 | ||
b0e9a30d VY |
1128 | br_vlan_get_tag(skb, &vid); |
1129 | mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid); | |
eb1d1641 HX |
1130 | if (!mp) |
1131 | goto out; | |
1132 | ||
1133 | max_delay *= br->multicast_last_member_count; | |
1134 | ||
8a870178 | 1135 | if (mp->mglist && |
eb1d1641 HX |
1136 | (timer_pending(&mp->timer) ? |
1137 | time_after(mp->timer.expires, now + max_delay) : | |
1138 | try_to_del_timer_sync(&mp->timer) >= 0)) | |
1139 | mod_timer(&mp->timer, now + max_delay); | |
1140 | ||
e8051688 ED |
1141 | for (pp = &mp->ports; |
1142 | (p = mlock_dereference(*pp, br)) != NULL; | |
1143 | pp = &p->next) { | |
eb1d1641 HX |
1144 | if (timer_pending(&p->timer) ? |
1145 | time_after(p->timer.expires, now + max_delay) : | |
1146 | try_to_del_timer_sync(&p->timer) >= 0) | |
24f9cdcb | 1147 | mod_timer(&p->timer, now + max_delay); |
eb1d1641 HX |
1148 | } |
1149 | ||
1150 | out: | |
1151 | spin_unlock(&br->multicast_lock); | |
bec68ff1 | 1152 | return err; |
eb1d1641 HX |
1153 | } |
1154 | ||
dfd56b8b | 1155 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1156 | static int br_ip6_multicast_query(struct net_bridge *br, |
1157 | struct net_bridge_port *port, | |
1158 | struct sk_buff *skb) | |
1159 | { | |
b71d1d42 | 1160 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
eca2a43b | 1161 | struct mld_msg *mld; |
08b202b6 YH |
1162 | struct net_bridge_mdb_entry *mp; |
1163 | struct mld2_query *mld2q; | |
e8051688 ED |
1164 | struct net_bridge_port_group *p; |
1165 | struct net_bridge_port_group __rcu **pp; | |
08b202b6 YH |
1166 | unsigned long max_delay; |
1167 | unsigned long now = jiffies; | |
b71d1d42 | 1168 | const struct in6_addr *group = NULL; |
08b202b6 | 1169 | int err = 0; |
b0e9a30d | 1170 | u16 vid = 0; |
08b202b6 YH |
1171 | |
1172 | spin_lock(&br->multicast_lock); | |
1173 | if (!netif_running(br->dev) || | |
1174 | (port && port->state == BR_STATE_DISABLED)) | |
1175 | goto out; | |
1176 | ||
1177 | br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr)); | |
1178 | ||
1179 | if (skb->len == sizeof(*mld)) { | |
1180 | if (!pskb_may_pull(skb, sizeof(*mld))) { | |
1181 | err = -EINVAL; | |
1182 | goto out; | |
1183 | } | |
1184 | mld = (struct mld_msg *) icmp6_hdr(skb); | |
4715213d | 1185 | max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay)); |
08b202b6 YH |
1186 | if (max_delay) |
1187 | group = &mld->mld_mca; | |
1188 | } else if (skb->len >= sizeof(*mld2q)) { | |
1189 | if (!pskb_may_pull(skb, sizeof(*mld2q))) { | |
1190 | err = -EINVAL; | |
1191 | goto out; | |
1192 | } | |
1193 | mld2q = (struct mld2_query *)icmp6_hdr(skb); | |
1194 | if (!mld2q->mld2q_nsrcs) | |
1195 | group = &mld2q->mld2q_mca; | |
8fa45a70 | 1196 | max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(ntohs(mld2q->mld2q_mrc)) : 1; |
08b202b6 YH |
1197 | } |
1198 | ||
1199 | if (!group) | |
1200 | goto out; | |
1201 | ||
b0e9a30d VY |
1202 | br_vlan_get_tag(skb, &vid); |
1203 | mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid); | |
08b202b6 YH |
1204 | if (!mp) |
1205 | goto out; | |
1206 | ||
1207 | max_delay *= br->multicast_last_member_count; | |
8a870178 | 1208 | if (mp->mglist && |
08b202b6 YH |
1209 | (timer_pending(&mp->timer) ? |
1210 | time_after(mp->timer.expires, now + max_delay) : | |
1211 | try_to_del_timer_sync(&mp->timer) >= 0)) | |
1212 | mod_timer(&mp->timer, now + max_delay); | |
1213 | ||
e8051688 ED |
1214 | for (pp = &mp->ports; |
1215 | (p = mlock_dereference(*pp, br)) != NULL; | |
1216 | pp = &p->next) { | |
08b202b6 YH |
1217 | if (timer_pending(&p->timer) ? |
1218 | time_after(p->timer.expires, now + max_delay) : | |
1219 | try_to_del_timer_sync(&p->timer) >= 0) | |
24f9cdcb | 1220 | mod_timer(&p->timer, now + max_delay); |
08b202b6 YH |
1221 | } |
1222 | ||
1223 | out: | |
1224 | spin_unlock(&br->multicast_lock); | |
1225 | return err; | |
1226 | } | |
1227 | #endif | |
1228 | ||
eb1d1641 HX |
1229 | static void br_multicast_leave_group(struct net_bridge *br, |
1230 | struct net_bridge_port *port, | |
8ef2a9a5 | 1231 | struct br_ip *group) |
eb1d1641 HX |
1232 | { |
1233 | struct net_bridge_mdb_htable *mdb; | |
1234 | struct net_bridge_mdb_entry *mp; | |
1235 | struct net_bridge_port_group *p; | |
1236 | unsigned long now; | |
1237 | unsigned long time; | |
1238 | ||
eb1d1641 HX |
1239 | spin_lock(&br->multicast_lock); |
1240 | if (!netif_running(br->dev) || | |
1241 | (port && port->state == BR_STATE_DISABLED) || | |
1242 | timer_pending(&br->multicast_querier_timer)) | |
1243 | goto out; | |
1244 | ||
e8051688 | 1245 | mdb = mlock_dereference(br->mdb, br); |
eb1d1641 HX |
1246 | mp = br_mdb_ip_get(mdb, group); |
1247 | if (!mp) | |
1248 | goto out; | |
1249 | ||
c2d3babf | 1250 | if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) { |
50426b59 AW |
1251 | struct net_bridge_port_group __rcu **pp; |
1252 | ||
1253 | for (pp = &mp->ports; | |
1254 | (p = mlock_dereference(*pp, br)) != NULL; | |
1255 | pp = &p->next) { | |
1256 | if (p->port != port) | |
1257 | continue; | |
1258 | ||
1259 | rcu_assign_pointer(*pp, p->next); | |
1260 | hlist_del_init(&p->mglist); | |
1261 | del_timer(&p->timer); | |
1262 | call_rcu_bh(&p->rcu, br_multicast_free_pg); | |
37a393bc | 1263 | br_mdb_notify(br->dev, port, group, RTM_DELMDB); |
50426b59 AW |
1264 | |
1265 | if (!mp->ports && !mp->mglist && | |
1266 | netif_running(br->dev)) | |
1267 | mod_timer(&mp->timer, jiffies); | |
1268 | } | |
1269 | goto out; | |
1270 | } | |
1271 | ||
eb1d1641 HX |
1272 | now = jiffies; |
1273 | time = now + br->multicast_last_member_count * | |
1274 | br->multicast_last_member_interval; | |
1275 | ||
1276 | if (!port) { | |
8a870178 | 1277 | if (mp->mglist && |
eb1d1641 HX |
1278 | (timer_pending(&mp->timer) ? |
1279 | time_after(mp->timer.expires, time) : | |
1280 | try_to_del_timer_sync(&mp->timer) >= 0)) { | |
1281 | mod_timer(&mp->timer, time); | |
eb1d1641 HX |
1282 | } |
1283 | ||
1284 | goto out; | |
1285 | } | |
1286 | ||
e8051688 ED |
1287 | for (p = mlock_dereference(mp->ports, br); |
1288 | p != NULL; | |
1289 | p = mlock_dereference(p->next, br)) { | |
eb1d1641 HX |
1290 | if (p->port != port) |
1291 | continue; | |
1292 | ||
1293 | if (!hlist_unhashed(&p->mglist) && | |
1294 | (timer_pending(&p->timer) ? | |
1295 | time_after(p->timer.expires, time) : | |
1296 | try_to_del_timer_sync(&p->timer) >= 0)) { | |
1297 | mod_timer(&p->timer, time); | |
eb1d1641 HX |
1298 | } |
1299 | ||
1300 | break; | |
1301 | } | |
1302 | ||
1303 | out: | |
1304 | spin_unlock(&br->multicast_lock); | |
1305 | } | |
1306 | ||
8ef2a9a5 YH |
1307 | static void br_ip4_multicast_leave_group(struct net_bridge *br, |
1308 | struct net_bridge_port *port, | |
b0e9a30d VY |
1309 | __be32 group, |
1310 | __u16 vid) | |
8ef2a9a5 YH |
1311 | { |
1312 | struct br_ip br_group; | |
1313 | ||
1314 | if (ipv4_is_local_multicast(group)) | |
1315 | return; | |
1316 | ||
1317 | br_group.u.ip4 = group; | |
1318 | br_group.proto = htons(ETH_P_IP); | |
b0e9a30d | 1319 | br_group.vid = vid; |
8ef2a9a5 YH |
1320 | |
1321 | br_multicast_leave_group(br, port, &br_group); | |
1322 | } | |
1323 | ||
dfd56b8b | 1324 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1325 | static void br_ip6_multicast_leave_group(struct net_bridge *br, |
1326 | struct net_bridge_port *port, | |
b0e9a30d VY |
1327 | const struct in6_addr *group, |
1328 | __u16 vid) | |
08b202b6 YH |
1329 | { |
1330 | struct br_ip br_group; | |
1331 | ||
e4de9f9e | 1332 | if (!ipv6_is_transient_multicast(group)) |
08b202b6 YH |
1333 | return; |
1334 | ||
4e3fd7a0 | 1335 | br_group.u.ip6 = *group; |
08b202b6 | 1336 | br_group.proto = htons(ETH_P_IPV6); |
b0e9a30d | 1337 | br_group.vid = vid; |
08b202b6 YH |
1338 | |
1339 | br_multicast_leave_group(br, port, &br_group); | |
1340 | } | |
1341 | #endif | |
8ef2a9a5 | 1342 | |
eb1d1641 HX |
1343 | static int br_multicast_ipv4_rcv(struct net_bridge *br, |
1344 | struct net_bridge_port *port, | |
1345 | struct sk_buff *skb) | |
1346 | { | |
1347 | struct sk_buff *skb2 = skb; | |
b71d1d42 | 1348 | const struct iphdr *iph; |
eb1d1641 | 1349 | struct igmphdr *ih; |
95c96174 ED |
1350 | unsigned int len; |
1351 | unsigned int offset; | |
eb1d1641 | 1352 | int err; |
b0e9a30d | 1353 | u16 vid = 0; |
eb1d1641 | 1354 | |
eb1d1641 HX |
1355 | /* We treat OOM as packet loss for now. */ |
1356 | if (!pskb_may_pull(skb, sizeof(*iph))) | |
1357 | return -EINVAL; | |
1358 | ||
1359 | iph = ip_hdr(skb); | |
1360 | ||
1361 | if (iph->ihl < 5 || iph->version != 4) | |
1362 | return -EINVAL; | |
1363 | ||
1364 | if (!pskb_may_pull(skb, ip_hdrlen(skb))) | |
1365 | return -EINVAL; | |
1366 | ||
1367 | iph = ip_hdr(skb); | |
1368 | ||
1369 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
1370 | return -EINVAL; | |
1371 | ||
bd4265fe | 1372 | if (iph->protocol != IPPROTO_IGMP) { |
bf5e4dd6 | 1373 | if (!ipv4_is_local_multicast(iph->daddr)) |
bd4265fe | 1374 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
eb1d1641 | 1375 | return 0; |
bd4265fe | 1376 | } |
eb1d1641 HX |
1377 | |
1378 | len = ntohs(iph->tot_len); | |
1379 | if (skb->len < len || len < ip_hdrlen(skb)) | |
1380 | return -EINVAL; | |
1381 | ||
1382 | if (skb->len > len) { | |
1383 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1384 | if (!skb2) | |
1385 | return -ENOMEM; | |
1386 | ||
1387 | err = pskb_trim_rcsum(skb2, len); | |
1388 | if (err) | |
8440853b | 1389 | goto err_out; |
eb1d1641 HX |
1390 | } |
1391 | ||
1392 | len -= ip_hdrlen(skb2); | |
1393 | offset = skb_network_offset(skb2) + ip_hdrlen(skb2); | |
1394 | __skb_pull(skb2, offset); | |
1395 | skb_reset_transport_header(skb2); | |
1396 | ||
1397 | err = -EINVAL; | |
1398 | if (!pskb_may_pull(skb2, sizeof(*ih))) | |
1399 | goto out; | |
1400 | ||
eb1d1641 HX |
1401 | switch (skb2->ip_summed) { |
1402 | case CHECKSUM_COMPLETE: | |
1403 | if (!csum_fold(skb2->csum)) | |
1404 | break; | |
1405 | /* fall through */ | |
1406 | case CHECKSUM_NONE: | |
1407 | skb2->csum = 0; | |
1408 | if (skb_checksum_complete(skb2)) | |
8440853b | 1409 | goto out; |
eb1d1641 HX |
1410 | } |
1411 | ||
1412 | err = 0; | |
1413 | ||
b0e9a30d | 1414 | br_vlan_get_tag(skb2, &vid); |
eb1d1641 HX |
1415 | BR_INPUT_SKB_CB(skb)->igmp = 1; |
1416 | ih = igmp_hdr(skb2); | |
1417 | ||
1418 | switch (ih->type) { | |
1419 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1420 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
62b2bcb4 | 1421 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
b0e9a30d | 1422 | err = br_ip4_multicast_add_group(br, port, ih->group, vid); |
eb1d1641 HX |
1423 | break; |
1424 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
8ef2a9a5 | 1425 | err = br_ip4_multicast_igmp3_report(br, port, skb2); |
eb1d1641 HX |
1426 | break; |
1427 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
8ef2a9a5 | 1428 | err = br_ip4_multicast_query(br, port, skb2); |
eb1d1641 HX |
1429 | break; |
1430 | case IGMP_HOST_LEAVE_MESSAGE: | |
b0e9a30d | 1431 | br_ip4_multicast_leave_group(br, port, ih->group, vid); |
eb1d1641 HX |
1432 | break; |
1433 | } | |
1434 | ||
1435 | out: | |
1436 | __skb_push(skb2, offset); | |
8440853b | 1437 | err_out: |
eb1d1641 HX |
1438 | if (skb2 != skb) |
1439 | kfree_skb(skb2); | |
1440 | return err; | |
1441 | } | |
1442 | ||
dfd56b8b | 1443 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1444 | static int br_multicast_ipv6_rcv(struct net_bridge *br, |
1445 | struct net_bridge_port *port, | |
1446 | struct sk_buff *skb) | |
1447 | { | |
9d89081d | 1448 | struct sk_buff *skb2; |
b71d1d42 | 1449 | const struct ipv6hdr *ip6h; |
22df1331 | 1450 | u8 icmp6_type; |
08b202b6 | 1451 | u8 nexthdr; |
75f2811c | 1452 | __be16 frag_off; |
95c96174 | 1453 | unsigned int len; |
bb7a0bd6 | 1454 | int offset; |
08b202b6 | 1455 | int err; |
b0e9a30d | 1456 | u16 vid = 0; |
08b202b6 | 1457 | |
08b202b6 YH |
1458 | if (!pskb_may_pull(skb, sizeof(*ip6h))) |
1459 | return -EINVAL; | |
1460 | ||
1461 | ip6h = ipv6_hdr(skb); | |
1462 | ||
1463 | /* | |
1464 | * We're interested in MLD messages only. | |
1465 | * - Version is 6 | |
1466 | * - MLD has always Router Alert hop-by-hop option | |
1467 | * - But we do not support jumbrograms. | |
1468 | */ | |
1469 | if (ip6h->version != 6 || | |
1470 | ip6h->nexthdr != IPPROTO_HOPOPTS || | |
1471 | ip6h->payload_len == 0) | |
1472 | return 0; | |
1473 | ||
ff9a57a6 | 1474 | len = ntohs(ip6h->payload_len) + sizeof(*ip6h); |
08b202b6 YH |
1475 | if (skb->len < len) |
1476 | return -EINVAL; | |
1477 | ||
1478 | nexthdr = ip6h->nexthdr; | |
75f2811c | 1479 | offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off); |
08b202b6 YH |
1480 | |
1481 | if (offset < 0 || nexthdr != IPPROTO_ICMPV6) | |
1482 | return 0; | |
1483 | ||
1484 | /* Okay, we found ICMPv6 header */ | |
1485 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1486 | if (!skb2) | |
1487 | return -ENOMEM; | |
1488 | ||
9d89081d TW |
1489 | err = -EINVAL; |
1490 | if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr))) | |
1491 | goto out; | |
1492 | ||
08b202b6 YH |
1493 | len -= offset - skb_network_offset(skb2); |
1494 | ||
1495 | __skb_pull(skb2, offset); | |
1496 | skb_reset_transport_header(skb2); | |
fa2da8cd | 1497 | skb_postpull_rcsum(skb2, skb_network_header(skb2), |
1498 | skb_network_header_len(skb2)); | |
08b202b6 | 1499 | |
22df1331 | 1500 | icmp6_type = icmp6_hdr(skb2)->icmp6_type; |
08b202b6 | 1501 | |
22df1331 | 1502 | switch (icmp6_type) { |
08b202b6 YH |
1503 | case ICMPV6_MGM_QUERY: |
1504 | case ICMPV6_MGM_REPORT: | |
1505 | case ICMPV6_MGM_REDUCTION: | |
1506 | case ICMPV6_MLD2_REPORT: | |
1507 | break; | |
1508 | default: | |
1509 | err = 0; | |
1510 | goto out; | |
1511 | } | |
1512 | ||
1513 | /* Okay, we found MLD message. Check further. */ | |
1514 | if (skb2->len > len) { | |
1515 | err = pskb_trim_rcsum(skb2, len); | |
1516 | if (err) | |
1517 | goto out; | |
4b275d7e | 1518 | err = -EINVAL; |
08b202b6 YH |
1519 | } |
1520 | ||
4b275d7e YZ |
1521 | ip6h = ipv6_hdr(skb2); |
1522 | ||
08b202b6 YH |
1523 | switch (skb2->ip_summed) { |
1524 | case CHECKSUM_COMPLETE: | |
4b275d7e YZ |
1525 | if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len, |
1526 | IPPROTO_ICMPV6, skb2->csum)) | |
08b202b6 YH |
1527 | break; |
1528 | /*FALLTHROUGH*/ | |
1529 | case CHECKSUM_NONE: | |
4b275d7e YZ |
1530 | skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr, |
1531 | &ip6h->daddr, | |
1532 | skb2->len, | |
1533 | IPPROTO_ICMPV6, 0)); | |
1534 | if (__skb_checksum_complete(skb2)) | |
08b202b6 YH |
1535 | goto out; |
1536 | } | |
1537 | ||
1538 | err = 0; | |
1539 | ||
b0e9a30d | 1540 | br_vlan_get_tag(skb, &vid); |
08b202b6 YH |
1541 | BR_INPUT_SKB_CB(skb)->igmp = 1; |
1542 | ||
22df1331 | 1543 | switch (icmp6_type) { |
08b202b6 YH |
1544 | case ICMPV6_MGM_REPORT: |
1545 | { | |
9d89081d TW |
1546 | struct mld_msg *mld; |
1547 | if (!pskb_may_pull(skb2, sizeof(*mld))) { | |
1548 | err = -EINVAL; | |
1549 | goto out; | |
1550 | } | |
1551 | mld = (struct mld_msg *)skb_transport_header(skb2); | |
fc2af6c7 | 1552 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
b0e9a30d | 1553 | err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid); |
08b202b6 YH |
1554 | break; |
1555 | } | |
1556 | case ICMPV6_MLD2_REPORT: | |
1557 | err = br_ip6_multicast_mld2_report(br, port, skb2); | |
1558 | break; | |
1559 | case ICMPV6_MGM_QUERY: | |
1560 | err = br_ip6_multicast_query(br, port, skb2); | |
1561 | break; | |
1562 | case ICMPV6_MGM_REDUCTION: | |
1563 | { | |
9d89081d TW |
1564 | struct mld_msg *mld; |
1565 | if (!pskb_may_pull(skb2, sizeof(*mld))) { | |
1566 | err = -EINVAL; | |
1567 | goto out; | |
1568 | } | |
1569 | mld = (struct mld_msg *)skb_transport_header(skb2); | |
b0e9a30d | 1570 | br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid); |
08b202b6 YH |
1571 | } |
1572 | } | |
1573 | ||
1574 | out: | |
9d89081d | 1575 | kfree_skb(skb2); |
08b202b6 YH |
1576 | return err; |
1577 | } | |
1578 | #endif | |
1579 | ||
eb1d1641 HX |
1580 | int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, |
1581 | struct sk_buff *skb) | |
1582 | { | |
1fafc7a9 YH |
1583 | BR_INPUT_SKB_CB(skb)->igmp = 0; |
1584 | BR_INPUT_SKB_CB(skb)->mrouters_only = 0; | |
1585 | ||
eb1d1641 HX |
1586 | if (br->multicast_disabled) |
1587 | return 0; | |
1588 | ||
1589 | switch (skb->protocol) { | |
1590 | case htons(ETH_P_IP): | |
1591 | return br_multicast_ipv4_rcv(br, port, skb); | |
dfd56b8b | 1592 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1593 | case htons(ETH_P_IPV6): |
1594 | return br_multicast_ipv6_rcv(br, port, skb); | |
1595 | #endif | |
eb1d1641 HX |
1596 | } |
1597 | ||
1598 | return 0; | |
1599 | } | |
1600 | ||
1601 | static void br_multicast_query_expired(unsigned long data) | |
1602 | { | |
1603 | struct net_bridge *br = (void *)data; | |
1604 | ||
1605 | spin_lock(&br->multicast_lock); | |
1606 | if (br->multicast_startup_queries_sent < | |
1607 | br->multicast_startup_query_count) | |
1608 | br->multicast_startup_queries_sent++; | |
1609 | ||
1610 | br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent); | |
1611 | ||
1612 | spin_unlock(&br->multicast_lock); | |
1613 | } | |
1614 | ||
1615 | void br_multicast_init(struct net_bridge *br) | |
1616 | { | |
1617 | br->hash_elasticity = 4; | |
1618 | br->hash_max = 512; | |
1619 | ||
1620 | br->multicast_router = 1; | |
c5c23260 | 1621 | br->multicast_querier = 0; |
eb1d1641 HX |
1622 | br->multicast_last_member_count = 2; |
1623 | br->multicast_startup_query_count = 2; | |
1624 | ||
1625 | br->multicast_last_member_interval = HZ; | |
1626 | br->multicast_query_response_interval = 10 * HZ; | |
1627 | br->multicast_startup_query_interval = 125 * HZ / 4; | |
1628 | br->multicast_query_interval = 125 * HZ; | |
1629 | br->multicast_querier_interval = 255 * HZ; | |
1630 | br->multicast_membership_interval = 260 * HZ; | |
1631 | ||
1632 | spin_lock_init(&br->multicast_lock); | |
1633 | setup_timer(&br->multicast_router_timer, | |
1634 | br_multicast_local_router_expired, 0); | |
1635 | setup_timer(&br->multicast_querier_timer, | |
bb63f1f8 | 1636 | br_multicast_querier_expired, (unsigned long)br); |
eb1d1641 HX |
1637 | setup_timer(&br->multicast_query_timer, br_multicast_query_expired, |
1638 | (unsigned long)br); | |
1639 | } | |
1640 | ||
1641 | void br_multicast_open(struct net_bridge *br) | |
1642 | { | |
1643 | br->multicast_startup_queries_sent = 0; | |
1644 | ||
1645 | if (br->multicast_disabled) | |
1646 | return; | |
1647 | ||
1648 | mod_timer(&br->multicast_query_timer, jiffies); | |
1649 | } | |
1650 | ||
1651 | void br_multicast_stop(struct net_bridge *br) | |
1652 | { | |
1653 | struct net_bridge_mdb_htable *mdb; | |
1654 | struct net_bridge_mdb_entry *mp; | |
b67bfe0d | 1655 | struct hlist_node *n; |
eb1d1641 HX |
1656 | u32 ver; |
1657 | int i; | |
1658 | ||
1659 | del_timer_sync(&br->multicast_router_timer); | |
1660 | del_timer_sync(&br->multicast_querier_timer); | |
1661 | del_timer_sync(&br->multicast_query_timer); | |
1662 | ||
1663 | spin_lock_bh(&br->multicast_lock); | |
e8051688 | 1664 | mdb = mlock_dereference(br->mdb, br); |
eb1d1641 HX |
1665 | if (!mdb) |
1666 | goto out; | |
1667 | ||
1668 | br->mdb = NULL; | |
1669 | ||
1670 | ver = mdb->ver; | |
1671 | for (i = 0; i < mdb->max; i++) { | |
b67bfe0d | 1672 | hlist_for_each_entry_safe(mp, n, &mdb->mhash[i], |
eb1d1641 HX |
1673 | hlist[ver]) { |
1674 | del_timer(&mp->timer); | |
eb1d1641 HX |
1675 | call_rcu_bh(&mp->rcu, br_multicast_free_group); |
1676 | } | |
1677 | } | |
1678 | ||
1679 | if (mdb->old) { | |
1680 | spin_unlock_bh(&br->multicast_lock); | |
10cc2b50 | 1681 | rcu_barrier_bh(); |
eb1d1641 HX |
1682 | spin_lock_bh(&br->multicast_lock); |
1683 | WARN_ON(mdb->old); | |
1684 | } | |
1685 | ||
1686 | mdb->old = mdb; | |
1687 | call_rcu_bh(&mdb->rcu, br_mdb_free); | |
1688 | ||
1689 | out: | |
1690 | spin_unlock_bh(&br->multicast_lock); | |
1691 | } | |
0909e117 HX |
1692 | |
1693 | int br_multicast_set_router(struct net_bridge *br, unsigned long val) | |
1694 | { | |
1695 | int err = -ENOENT; | |
1696 | ||
1697 | spin_lock_bh(&br->multicast_lock); | |
1698 | if (!netif_running(br->dev)) | |
1699 | goto unlock; | |
1700 | ||
1701 | switch (val) { | |
1702 | case 0: | |
1703 | case 2: | |
1704 | del_timer(&br->multicast_router_timer); | |
1705 | /* fall through */ | |
1706 | case 1: | |
1707 | br->multicast_router = val; | |
1708 | err = 0; | |
1709 | break; | |
1710 | ||
1711 | default: | |
1712 | err = -EINVAL; | |
1713 | break; | |
1714 | } | |
1715 | ||
1716 | unlock: | |
1717 | spin_unlock_bh(&br->multicast_lock); | |
1718 | ||
1719 | return err; | |
1720 | } | |
1721 | ||
1722 | int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) | |
1723 | { | |
1724 | struct net_bridge *br = p->br; | |
1725 | int err = -ENOENT; | |
1726 | ||
1727 | spin_lock(&br->multicast_lock); | |
1728 | if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED) | |
1729 | goto unlock; | |
1730 | ||
1731 | switch (val) { | |
1732 | case 0: | |
1733 | case 1: | |
1734 | case 2: | |
1735 | p->multicast_router = val; | |
1736 | err = 0; | |
1737 | ||
1738 | if (val < 2 && !hlist_unhashed(&p->rlist)) | |
1739 | hlist_del_init_rcu(&p->rlist); | |
1740 | ||
1741 | if (val == 1) | |
1742 | break; | |
1743 | ||
1744 | del_timer(&p->multicast_router_timer); | |
1745 | ||
1746 | if (val == 0) | |
1747 | break; | |
1748 | ||
1749 | br_multicast_add_router(br, p); | |
1750 | break; | |
1751 | ||
1752 | default: | |
1753 | err = -EINVAL; | |
1754 | break; | |
1755 | } | |
1756 | ||
1757 | unlock: | |
1758 | spin_unlock(&br->multicast_lock); | |
1759 | ||
1760 | return err; | |
1761 | } | |
561f1103 | 1762 | |
74857216 | 1763 | static void br_multicast_start_querier(struct net_bridge *br) |
561f1103 HX |
1764 | { |
1765 | struct net_bridge_port *port; | |
74857216 HX |
1766 | |
1767 | br_multicast_open(br); | |
1768 | ||
1769 | list_for_each_entry(port, &br->port_list, list) { | |
1770 | if (port->state == BR_STATE_DISABLED || | |
1771 | port->state == BR_STATE_BLOCKING) | |
1772 | continue; | |
1773 | ||
1774 | __br_multicast_enable_port(port); | |
1775 | } | |
1776 | } | |
1777 | ||
1778 | int br_multicast_toggle(struct net_bridge *br, unsigned long val) | |
1779 | { | |
3a7fda06 | 1780 | int err = 0; |
e8051688 | 1781 | struct net_bridge_mdb_htable *mdb; |
561f1103 | 1782 | |
ef5e0d82 | 1783 | spin_lock_bh(&br->multicast_lock); |
561f1103 HX |
1784 | if (br->multicast_disabled == !val) |
1785 | goto unlock; | |
1786 | ||
1787 | br->multicast_disabled = !val; | |
1788 | if (br->multicast_disabled) | |
1789 | goto unlock; | |
1790 | ||
3a7fda06 HX |
1791 | if (!netif_running(br->dev)) |
1792 | goto unlock; | |
1793 | ||
e8051688 ED |
1794 | mdb = mlock_dereference(br->mdb, br); |
1795 | if (mdb) { | |
1796 | if (mdb->old) { | |
561f1103 HX |
1797 | err = -EEXIST; |
1798 | rollback: | |
1799 | br->multicast_disabled = !!val; | |
1800 | goto unlock; | |
1801 | } | |
1802 | ||
e8051688 | 1803 | err = br_mdb_rehash(&br->mdb, mdb->max, |
561f1103 HX |
1804 | br->hash_elasticity); |
1805 | if (err) | |
1806 | goto rollback; | |
1807 | } | |
1808 | ||
74857216 | 1809 | br_multicast_start_querier(br); |
561f1103 HX |
1810 | |
1811 | unlock: | |
ef5e0d82 | 1812 | spin_unlock_bh(&br->multicast_lock); |
561f1103 HX |
1813 | |
1814 | return err; | |
1815 | } | |
b195167f | 1816 | |
c5c23260 HX |
1817 | int br_multicast_set_querier(struct net_bridge *br, unsigned long val) |
1818 | { | |
1819 | val = !!val; | |
1820 | ||
1821 | spin_lock_bh(&br->multicast_lock); | |
1822 | if (br->multicast_querier == val) | |
1823 | goto unlock; | |
1824 | ||
1825 | br->multicast_querier = val; | |
1826 | if (val) | |
1827 | br_multicast_start_querier(br); | |
1828 | ||
1829 | unlock: | |
1830 | spin_unlock_bh(&br->multicast_lock); | |
1831 | ||
1832 | return 0; | |
1833 | } | |
1834 | ||
b195167f HX |
1835 | int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) |
1836 | { | |
1837 | int err = -ENOENT; | |
1838 | u32 old; | |
e8051688 | 1839 | struct net_bridge_mdb_htable *mdb; |
b195167f HX |
1840 | |
1841 | spin_lock(&br->multicast_lock); | |
1842 | if (!netif_running(br->dev)) | |
1843 | goto unlock; | |
1844 | ||
1845 | err = -EINVAL; | |
1846 | if (!is_power_of_2(val)) | |
1847 | goto unlock; | |
e8051688 ED |
1848 | |
1849 | mdb = mlock_dereference(br->mdb, br); | |
1850 | if (mdb && val < mdb->size) | |
b195167f HX |
1851 | goto unlock; |
1852 | ||
1853 | err = 0; | |
1854 | ||
1855 | old = br->hash_max; | |
1856 | br->hash_max = val; | |
1857 | ||
e8051688 ED |
1858 | if (mdb) { |
1859 | if (mdb->old) { | |
b195167f HX |
1860 | err = -EEXIST; |
1861 | rollback: | |
1862 | br->hash_max = old; | |
1863 | goto unlock; | |
1864 | } | |
1865 | ||
1866 | err = br_mdb_rehash(&br->mdb, br->hash_max, | |
1867 | br->hash_elasticity); | |
1868 | if (err) | |
1869 | goto rollback; | |
1870 | } | |
1871 | ||
1872 | unlock: | |
1873 | spin_unlock(&br->multicast_lock); | |
1874 | ||
1875 | return err; | |
1876 | } |