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Commit | Line | Data |
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eb1d1641 HX |
1 | /* |
2 | * Bridge multicast support. | |
3 | * | |
4 | * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the Free | |
8 | * Software Foundation; either version 2 of the License, or (at your option) | |
9 | * any later version. | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/err.h> | |
14 | #include <linux/if_ether.h> | |
15 | #include <linux/igmp.h> | |
16 | #include <linux/jhash.h> | |
17 | #include <linux/kernel.h> | |
b195167f | 18 | #include <linux/log2.h> |
eb1d1641 HX |
19 | #include <linux/netdevice.h> |
20 | #include <linux/netfilter_bridge.h> | |
21 | #include <linux/random.h> | |
22 | #include <linux/rculist.h> | |
23 | #include <linux/skbuff.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/timer.h> | |
1c8ad5bf | 26 | #include <linux/inetdevice.h> |
eb1d1641 | 27 | #include <net/ip.h> |
dfd56b8b | 28 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
29 | #include <net/ipv6.h> |
30 | #include <net/mld.h> | |
d4c4f07d | 31 | #include <net/ip6_checksum.h> |
3c3769e6 | 32 | #include <net/addrconf.h> |
08b202b6 | 33 | #endif |
eb1d1641 HX |
34 | |
35 | #include "br_private.h" | |
36 | ||
cc0fdd80 LL |
37 | static void br_multicast_start_querier(struct net_bridge *br, |
38 | struct bridge_mcast_query *query); | |
2ce297fc | 39 | unsigned int br_mdb_rehash_seq; |
c83b8fab | 40 | |
8ef2a9a5 YH |
41 | static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b) |
42 | { | |
43 | if (a->proto != b->proto) | |
44 | return 0; | |
b0e9a30d VY |
45 | if (a->vid != b->vid) |
46 | return 0; | |
8ef2a9a5 YH |
47 | switch (a->proto) { |
48 | case htons(ETH_P_IP): | |
49 | return a->u.ip4 == b->u.ip4; | |
dfd56b8b | 50 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
51 | case htons(ETH_P_IPV6): |
52 | return ipv6_addr_equal(&a->u.ip6, &b->u.ip6); | |
53 | #endif | |
8ef2a9a5 YH |
54 | } |
55 | return 0; | |
56 | } | |
57 | ||
b0e9a30d VY |
58 | static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip, |
59 | __u16 vid) | |
eb1d1641 | 60 | { |
b0e9a30d | 61 | return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1); |
eb1d1641 HX |
62 | } |
63 | ||
dfd56b8b | 64 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 65 | static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb, |
b0e9a30d VY |
66 | const struct in6_addr *ip, |
67 | __u16 vid) | |
08b202b6 | 68 | { |
b0e9a30d VY |
69 | return jhash_2words(ipv6_addr_hash(ip), vid, |
70 | mdb->secret) & (mdb->max - 1); | |
08b202b6 YH |
71 | } |
72 | #endif | |
73 | ||
8ef2a9a5 YH |
74 | static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb, |
75 | struct br_ip *ip) | |
76 | { | |
77 | switch (ip->proto) { | |
78 | case htons(ETH_P_IP): | |
b0e9a30d | 79 | return __br_ip4_hash(mdb, ip->u.ip4, ip->vid); |
dfd56b8b | 80 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 81 | case htons(ETH_P_IPV6): |
b0e9a30d | 82 | return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid); |
08b202b6 | 83 | #endif |
8ef2a9a5 YH |
84 | } |
85 | return 0; | |
eb1d1641 HX |
86 | } |
87 | ||
88 | static struct net_bridge_mdb_entry *__br_mdb_ip_get( | |
8ef2a9a5 | 89 | struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash) |
eb1d1641 HX |
90 | { |
91 | struct net_bridge_mdb_entry *mp; | |
eb1d1641 | 92 | |
b67bfe0d | 93 | hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) { |
8ef2a9a5 | 94 | if (br_ip_equal(&mp->addr, dst)) |
eb1d1641 HX |
95 | return mp; |
96 | } | |
97 | ||
98 | return NULL; | |
99 | } | |
100 | ||
cfd56754 CW |
101 | struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, |
102 | struct br_ip *dst) | |
7f285fa7 HX |
103 | { |
104 | if (!mdb) | |
105 | return NULL; | |
106 | ||
107 | return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst)); | |
108 | } | |
109 | ||
8ef2a9a5 | 110 | static struct net_bridge_mdb_entry *br_mdb_ip4_get( |
b0e9a30d | 111 | struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid) |
eb1d1641 | 112 | { |
8ef2a9a5 YH |
113 | struct br_ip br_dst; |
114 | ||
115 | br_dst.u.ip4 = dst; | |
116 | br_dst.proto = htons(ETH_P_IP); | |
b0e9a30d | 117 | br_dst.vid = vid; |
0821ec55 | 118 | |
7f285fa7 | 119 | return br_mdb_ip_get(mdb, &br_dst); |
8ef2a9a5 YH |
120 | } |
121 | ||
dfd56b8b | 122 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 123 | static struct net_bridge_mdb_entry *br_mdb_ip6_get( |
b0e9a30d VY |
124 | struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst, |
125 | __u16 vid) | |
08b202b6 YH |
126 | { |
127 | struct br_ip br_dst; | |
0821ec55 | 128 | |
4e3fd7a0 | 129 | br_dst.u.ip6 = *dst; |
08b202b6 | 130 | br_dst.proto = htons(ETH_P_IPV6); |
b0e9a30d | 131 | br_dst.vid = vid; |
08b202b6 | 132 | |
7f285fa7 | 133 | return br_mdb_ip_get(mdb, &br_dst); |
08b202b6 YH |
134 | } |
135 | #endif | |
136 | ||
eb1d1641 | 137 | struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, |
fbca58a2 | 138 | struct sk_buff *skb, u16 vid) |
eb1d1641 | 139 | { |
e8051688 | 140 | struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb); |
8ef2a9a5 YH |
141 | struct br_ip ip; |
142 | ||
7f285fa7 | 143 | if (br->multicast_disabled) |
eb1d1641 HX |
144 | return NULL; |
145 | ||
8ef2a9a5 | 146 | if (BR_INPUT_SKB_CB(skb)->igmp) |
eb1d1641 HX |
147 | return NULL; |
148 | ||
8ef2a9a5 | 149 | ip.proto = skb->protocol; |
fbca58a2 | 150 | ip.vid = vid; |
8ef2a9a5 | 151 | |
eb1d1641 HX |
152 | switch (skb->protocol) { |
153 | case htons(ETH_P_IP): | |
8ef2a9a5 YH |
154 | ip.u.ip4 = ip_hdr(skb)->daddr; |
155 | break; | |
dfd56b8b | 156 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 157 | case htons(ETH_P_IPV6): |
4e3fd7a0 | 158 | ip.u.ip6 = ipv6_hdr(skb)->daddr; |
08b202b6 YH |
159 | break; |
160 | #endif | |
8ef2a9a5 YH |
161 | default: |
162 | return NULL; | |
eb1d1641 HX |
163 | } |
164 | ||
8ef2a9a5 | 165 | return br_mdb_ip_get(mdb, &ip); |
eb1d1641 HX |
166 | } |
167 | ||
168 | static void br_mdb_free(struct rcu_head *head) | |
169 | { | |
170 | struct net_bridge_mdb_htable *mdb = | |
171 | container_of(head, struct net_bridge_mdb_htable, rcu); | |
172 | struct net_bridge_mdb_htable *old = mdb->old; | |
173 | ||
174 | mdb->old = NULL; | |
175 | kfree(old->mhash); | |
176 | kfree(old); | |
177 | } | |
178 | ||
179 | static int br_mdb_copy(struct net_bridge_mdb_htable *new, | |
180 | struct net_bridge_mdb_htable *old, | |
181 | int elasticity) | |
182 | { | |
183 | struct net_bridge_mdb_entry *mp; | |
eb1d1641 HX |
184 | int maxlen; |
185 | int len; | |
186 | int i; | |
187 | ||
188 | for (i = 0; i < old->max; i++) | |
b67bfe0d | 189 | hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver]) |
eb1d1641 | 190 | hlist_add_head(&mp->hlist[new->ver], |
8ef2a9a5 | 191 | &new->mhash[br_ip_hash(new, &mp->addr)]); |
eb1d1641 HX |
192 | |
193 | if (!elasticity) | |
194 | return 0; | |
195 | ||
196 | maxlen = 0; | |
197 | for (i = 0; i < new->max; i++) { | |
198 | len = 0; | |
b67bfe0d | 199 | hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver]) |
eb1d1641 HX |
200 | len++; |
201 | if (len > maxlen) | |
202 | maxlen = len; | |
203 | } | |
204 | ||
205 | return maxlen > elasticity ? -EINVAL : 0; | |
206 | } | |
207 | ||
cfd56754 | 208 | void br_multicast_free_pg(struct rcu_head *head) |
eb1d1641 HX |
209 | { |
210 | struct net_bridge_port_group *p = | |
211 | container_of(head, struct net_bridge_port_group, rcu); | |
212 | ||
213 | kfree(p); | |
214 | } | |
215 | ||
216 | static void br_multicast_free_group(struct rcu_head *head) | |
217 | { | |
218 | struct net_bridge_mdb_entry *mp = | |
219 | container_of(head, struct net_bridge_mdb_entry, rcu); | |
220 | ||
221 | kfree(mp); | |
222 | } | |
223 | ||
224 | static void br_multicast_group_expired(unsigned long data) | |
225 | { | |
226 | struct net_bridge_mdb_entry *mp = (void *)data; | |
227 | struct net_bridge *br = mp->br; | |
228 | struct net_bridge_mdb_htable *mdb; | |
229 | ||
230 | spin_lock(&br->multicast_lock); | |
231 | if (!netif_running(br->dev) || timer_pending(&mp->timer)) | |
232 | goto out; | |
233 | ||
8a870178 | 234 | mp->mglist = false; |
eb1d1641 HX |
235 | |
236 | if (mp->ports) | |
237 | goto out; | |
238 | ||
e8051688 ED |
239 | mdb = mlock_dereference(br->mdb, br); |
240 | ||
eb1d1641 HX |
241 | hlist_del_rcu(&mp->hlist[mdb->ver]); |
242 | mdb->size--; | |
243 | ||
eb1d1641 HX |
244 | call_rcu_bh(&mp->rcu, br_multicast_free_group); |
245 | ||
246 | out: | |
247 | spin_unlock(&br->multicast_lock); | |
248 | } | |
249 | ||
250 | static void br_multicast_del_pg(struct net_bridge *br, | |
251 | struct net_bridge_port_group *pg) | |
252 | { | |
e8051688 | 253 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 HX |
254 | struct net_bridge_mdb_entry *mp; |
255 | struct net_bridge_port_group *p; | |
e8051688 ED |
256 | struct net_bridge_port_group __rcu **pp; |
257 | ||
258 | mdb = mlock_dereference(br->mdb, br); | |
eb1d1641 | 259 | |
8ef2a9a5 | 260 | mp = br_mdb_ip_get(mdb, &pg->addr); |
eb1d1641 HX |
261 | if (WARN_ON(!mp)) |
262 | return; | |
263 | ||
e8051688 ED |
264 | for (pp = &mp->ports; |
265 | (p = mlock_dereference(*pp, br)) != NULL; | |
266 | pp = &p->next) { | |
eb1d1641 HX |
267 | if (p != pg) |
268 | continue; | |
269 | ||
83f6a740 | 270 | rcu_assign_pointer(*pp, p->next); |
eb1d1641 HX |
271 | hlist_del_init(&p->mglist); |
272 | del_timer(&p->timer); | |
eb1d1641 HX |
273 | call_rcu_bh(&p->rcu, br_multicast_free_pg); |
274 | ||
c7e8e8a8 | 275 | if (!mp->ports && !mp->mglist && mp->timer_armed && |
eb1d1641 HX |
276 | netif_running(br->dev)) |
277 | mod_timer(&mp->timer, jiffies); | |
278 | ||
279 | return; | |
280 | } | |
281 | ||
282 | WARN_ON(1); | |
283 | } | |
284 | ||
285 | static void br_multicast_port_group_expired(unsigned long data) | |
286 | { | |
287 | struct net_bridge_port_group *pg = (void *)data; | |
288 | struct net_bridge *br = pg->port->br; | |
289 | ||
290 | spin_lock(&br->multicast_lock); | |
291 | if (!netif_running(br->dev) || timer_pending(&pg->timer) || | |
ccb1c31a | 292 | hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT) |
eb1d1641 HX |
293 | goto out; |
294 | ||
295 | br_multicast_del_pg(br, pg); | |
296 | ||
297 | out: | |
298 | spin_unlock(&br->multicast_lock); | |
299 | } | |
300 | ||
e8051688 | 301 | static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max, |
eb1d1641 HX |
302 | int elasticity) |
303 | { | |
e8051688 | 304 | struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1); |
eb1d1641 HX |
305 | struct net_bridge_mdb_htable *mdb; |
306 | int err; | |
307 | ||
308 | mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC); | |
309 | if (!mdb) | |
310 | return -ENOMEM; | |
311 | ||
312 | mdb->max = max; | |
313 | mdb->old = old; | |
314 | ||
315 | mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC); | |
316 | if (!mdb->mhash) { | |
317 | kfree(mdb); | |
318 | return -ENOMEM; | |
319 | } | |
320 | ||
321 | mdb->size = old ? old->size : 0; | |
322 | mdb->ver = old ? old->ver ^ 1 : 0; | |
323 | ||
324 | if (!old || elasticity) | |
325 | get_random_bytes(&mdb->secret, sizeof(mdb->secret)); | |
326 | else | |
327 | mdb->secret = old->secret; | |
328 | ||
329 | if (!old) | |
330 | goto out; | |
331 | ||
332 | err = br_mdb_copy(mdb, old, elasticity); | |
333 | if (err) { | |
334 | kfree(mdb->mhash); | |
335 | kfree(mdb); | |
336 | return err; | |
337 | } | |
338 | ||
2ce297fc | 339 | br_mdb_rehash_seq++; |
eb1d1641 HX |
340 | call_rcu_bh(&mdb->rcu, br_mdb_free); |
341 | ||
342 | out: | |
343 | rcu_assign_pointer(*mdbp, mdb); | |
344 | ||
345 | return 0; | |
346 | } | |
347 | ||
8ef2a9a5 YH |
348 | static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br, |
349 | __be32 group) | |
eb1d1641 HX |
350 | { |
351 | struct sk_buff *skb; | |
352 | struct igmphdr *ih; | |
353 | struct ethhdr *eth; | |
354 | struct iphdr *iph; | |
355 | ||
356 | skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) + | |
357 | sizeof(*ih) + 4); | |
358 | if (!skb) | |
359 | goto out; | |
360 | ||
361 | skb->protocol = htons(ETH_P_IP); | |
362 | ||
363 | skb_reset_mac_header(skb); | |
364 | eth = eth_hdr(skb); | |
365 | ||
366 | memcpy(eth->h_source, br->dev->dev_addr, 6); | |
367 | eth->h_dest[0] = 1; | |
368 | eth->h_dest[1] = 0; | |
369 | eth->h_dest[2] = 0x5e; | |
370 | eth->h_dest[3] = 0; | |
371 | eth->h_dest[4] = 0; | |
372 | eth->h_dest[5] = 1; | |
373 | eth->h_proto = htons(ETH_P_IP); | |
374 | skb_put(skb, sizeof(*eth)); | |
375 | ||
376 | skb_set_network_header(skb, skb->len); | |
377 | iph = ip_hdr(skb); | |
378 | ||
379 | iph->version = 4; | |
380 | iph->ihl = 6; | |
381 | iph->tos = 0xc0; | |
382 | iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4); | |
383 | iph->id = 0; | |
384 | iph->frag_off = htons(IP_DF); | |
385 | iph->ttl = 1; | |
386 | iph->protocol = IPPROTO_IGMP; | |
1c8ad5bf CW |
387 | iph->saddr = br->multicast_query_use_ifaddr ? |
388 | inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0; | |
eb1d1641 HX |
389 | iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); |
390 | ((u8 *)&iph[1])[0] = IPOPT_RA; | |
391 | ((u8 *)&iph[1])[1] = 4; | |
392 | ((u8 *)&iph[1])[2] = 0; | |
393 | ((u8 *)&iph[1])[3] = 0; | |
394 | ip_send_check(iph); | |
395 | skb_put(skb, 24); | |
396 | ||
397 | skb_set_transport_header(skb, skb->len); | |
398 | ih = igmp_hdr(skb); | |
399 | ih->type = IGMP_HOST_MEMBERSHIP_QUERY; | |
400 | ih->code = (group ? br->multicast_last_member_interval : | |
401 | br->multicast_query_response_interval) / | |
402 | (HZ / IGMP_TIMER_SCALE); | |
403 | ih->group = group; | |
404 | ih->csum = 0; | |
405 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
406 | skb_put(skb, sizeof(*ih)); | |
407 | ||
408 | __skb_pull(skb, sizeof(*eth)); | |
409 | ||
410 | out: | |
411 | return skb; | |
412 | } | |
413 | ||
dfd56b8b | 414 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 | 415 | static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, |
b71d1d42 | 416 | const struct in6_addr *group) |
08b202b6 YH |
417 | { |
418 | struct sk_buff *skb; | |
419 | struct ipv6hdr *ip6h; | |
420 | struct mld_msg *mldq; | |
421 | struct ethhdr *eth; | |
422 | u8 *hopopt; | |
423 | unsigned long interval; | |
424 | ||
425 | skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) + | |
426 | 8 + sizeof(*mldq)); | |
427 | if (!skb) | |
428 | goto out; | |
429 | ||
430 | skb->protocol = htons(ETH_P_IPV6); | |
431 | ||
432 | /* Ethernet header */ | |
433 | skb_reset_mac_header(skb); | |
434 | eth = eth_hdr(skb); | |
435 | ||
436 | memcpy(eth->h_source, br->dev->dev_addr, 6); | |
08b202b6 YH |
437 | eth->h_proto = htons(ETH_P_IPV6); |
438 | skb_put(skb, sizeof(*eth)); | |
439 | ||
440 | /* IPv6 header + HbH option */ | |
441 | skb_set_network_header(skb, skb->len); | |
442 | ip6h = ipv6_hdr(skb); | |
443 | ||
444 | *(__force __be32 *)ip6h = htonl(0x60000000); | |
76d66158 | 445 | ip6h->payload_len = htons(8 + sizeof(*mldq)); |
08b202b6 YH |
446 | ip6h->nexthdr = IPPROTO_HOPOPTS; |
447 | ip6h->hop_limit = 1; | |
a7bff75b | 448 | ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1)); |
d1d81d4c UW |
449 | if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0, |
450 | &ip6h->saddr)) { | |
451 | kfree_skb(skb); | |
452 | return NULL; | |
453 | } | |
36cff5a1 | 454 | ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); |
08b202b6 YH |
455 | |
456 | hopopt = (u8 *)(ip6h + 1); | |
457 | hopopt[0] = IPPROTO_ICMPV6; /* next hdr */ | |
458 | hopopt[1] = 0; /* length of HbH */ | |
459 | hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */ | |
460 | hopopt[3] = 2; /* Length of RA Option */ | |
461 | hopopt[4] = 0; /* Type = 0x0000 (MLD) */ | |
462 | hopopt[5] = 0; | |
1de5a71c EZ |
463 | hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */ |
464 | hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */ | |
08b202b6 YH |
465 | |
466 | skb_put(skb, sizeof(*ip6h) + 8); | |
467 | ||
468 | /* ICMPv6 */ | |
469 | skb_set_transport_header(skb, skb->len); | |
470 | mldq = (struct mld_msg *) icmp6_hdr(skb); | |
471 | ||
32de868c LL |
472 | interval = ipv6_addr_any(group) ? |
473 | br->multicast_query_response_interval : | |
474 | br->multicast_last_member_interval; | |
08b202b6 YH |
475 | |
476 | mldq->mld_type = ICMPV6_MGM_QUERY; | |
477 | mldq->mld_code = 0; | |
478 | mldq->mld_cksum = 0; | |
479 | mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); | |
480 | mldq->mld_reserved = 0; | |
4e3fd7a0 | 481 | mldq->mld_mca = *group; |
08b202b6 YH |
482 | |
483 | /* checksum */ | |
484 | mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
485 | sizeof(*mldq), IPPROTO_ICMPV6, | |
486 | csum_partial(mldq, | |
487 | sizeof(*mldq), 0)); | |
488 | skb_put(skb, sizeof(*mldq)); | |
489 | ||
490 | __skb_pull(skb, sizeof(*eth)); | |
491 | ||
492 | out: | |
493 | return skb; | |
494 | } | |
495 | #endif | |
496 | ||
8ef2a9a5 YH |
497 | static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, |
498 | struct br_ip *addr) | |
499 | { | |
500 | switch (addr->proto) { | |
501 | case htons(ETH_P_IP): | |
502 | return br_ip4_multicast_alloc_query(br, addr->u.ip4); | |
dfd56b8b | 503 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
504 | case htons(ETH_P_IPV6): |
505 | return br_ip6_multicast_alloc_query(br, &addr->u.ip6); | |
506 | #endif | |
8ef2a9a5 YH |
507 | } |
508 | return NULL; | |
509 | } | |
510 | ||
eb1d1641 | 511 | static struct net_bridge_mdb_entry *br_multicast_get_group( |
8ef2a9a5 YH |
512 | struct net_bridge *br, struct net_bridge_port *port, |
513 | struct br_ip *group, int hash) | |
eb1d1641 | 514 | { |
e8051688 | 515 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 | 516 | struct net_bridge_mdb_entry *mp; |
95c96174 ED |
517 | unsigned int count = 0; |
518 | unsigned int max; | |
eb1d1641 HX |
519 | int elasticity; |
520 | int err; | |
521 | ||
e8051688 | 522 | mdb = rcu_dereference_protected(br->mdb, 1); |
b67bfe0d | 523 | hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) { |
eb1d1641 | 524 | count++; |
8ef2a9a5 | 525 | if (unlikely(br_ip_equal(group, &mp->addr))) |
eb1d1641 | 526 | return mp; |
eb1d1641 HX |
527 | } |
528 | ||
529 | elasticity = 0; | |
530 | max = mdb->max; | |
531 | ||
532 | if (unlikely(count > br->hash_elasticity && count)) { | |
533 | if (net_ratelimit()) | |
28a16c97 | 534 | br_info(br, "Multicast hash table " |
535 | "chain limit reached: %s\n", | |
536 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
537 | |
538 | elasticity = br->hash_elasticity; | |
539 | } | |
540 | ||
541 | if (mdb->size >= max) { | |
542 | max *= 2; | |
036be6db TG |
543 | if (unlikely(max > br->hash_max)) { |
544 | br_warn(br, "Multicast hash table maximum of %d " | |
545 | "reached, disabling snooping: %s\n", | |
546 | br->hash_max, | |
547 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
548 | err = -E2BIG; |
549 | disable: | |
550 | br->multicast_disabled = 1; | |
551 | goto err; | |
552 | } | |
553 | } | |
554 | ||
555 | if (max > mdb->max || elasticity) { | |
556 | if (mdb->old) { | |
557 | if (net_ratelimit()) | |
28a16c97 | 558 | br_info(br, "Multicast hash table " |
559 | "on fire: %s\n", | |
560 | port ? port->dev->name : br->dev->name); | |
eb1d1641 HX |
561 | err = -EEXIST; |
562 | goto err; | |
563 | } | |
564 | ||
565 | err = br_mdb_rehash(&br->mdb, max, elasticity); | |
566 | if (err) { | |
28a16c97 | 567 | br_warn(br, "Cannot rehash multicast " |
568 | "hash table, disabling snooping: %s, %d, %d\n", | |
569 | port ? port->dev->name : br->dev->name, | |
570 | mdb->size, err); | |
eb1d1641 HX |
571 | goto disable; |
572 | } | |
573 | ||
574 | err = -EAGAIN; | |
575 | goto err; | |
576 | } | |
577 | ||
578 | return NULL; | |
579 | ||
580 | err: | |
581 | mp = ERR_PTR(err); | |
582 | return mp; | |
583 | } | |
584 | ||
cfd56754 CW |
585 | struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br, |
586 | struct net_bridge_port *port, struct br_ip *group) | |
eb1d1641 | 587 | { |
e8051688 | 588 | struct net_bridge_mdb_htable *mdb; |
eb1d1641 HX |
589 | struct net_bridge_mdb_entry *mp; |
590 | int hash; | |
4c0833bc | 591 | int err; |
eb1d1641 | 592 | |
e8051688 | 593 | mdb = rcu_dereference_protected(br->mdb, 1); |
eb1d1641 | 594 | if (!mdb) { |
4c0833bc TK |
595 | err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0); |
596 | if (err) | |
597 | return ERR_PTR(err); | |
eb1d1641 HX |
598 | goto rehash; |
599 | } | |
600 | ||
601 | hash = br_ip_hash(mdb, group); | |
602 | mp = br_multicast_get_group(br, port, group, hash); | |
603 | switch (PTR_ERR(mp)) { | |
604 | case 0: | |
605 | break; | |
606 | ||
607 | case -EAGAIN: | |
608 | rehash: | |
e8051688 | 609 | mdb = rcu_dereference_protected(br->mdb, 1); |
eb1d1641 HX |
610 | hash = br_ip_hash(mdb, group); |
611 | break; | |
612 | ||
613 | default: | |
614 | goto out; | |
615 | } | |
616 | ||
617 | mp = kzalloc(sizeof(*mp), GFP_ATOMIC); | |
618 | if (unlikely(!mp)) | |
4c0833bc | 619 | return ERR_PTR(-ENOMEM); |
eb1d1641 HX |
620 | |
621 | mp->br = br; | |
8ef2a9a5 | 622 | mp->addr = *group; |
eb1d1641 | 623 | |
1faabf2a ED |
624 | setup_timer(&mp->timer, br_multicast_group_expired, |
625 | (unsigned long)mp); | |
626 | ||
eb1d1641 HX |
627 | hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]); |
628 | mdb->size++; | |
629 | ||
630 | out: | |
631 | return mp; | |
632 | } | |
633 | ||
cfd56754 CW |
634 | struct net_bridge_port_group *br_multicast_new_port_group( |
635 | struct net_bridge_port *port, | |
636 | struct br_ip *group, | |
ccb1c31a AW |
637 | struct net_bridge_port_group __rcu *next, |
638 | unsigned char state) | |
cfd56754 CW |
639 | { |
640 | struct net_bridge_port_group *p; | |
641 | ||
642 | p = kzalloc(sizeof(*p), GFP_ATOMIC); | |
643 | if (unlikely(!p)) | |
644 | return NULL; | |
645 | ||
646 | p->addr = *group; | |
647 | p->port = port; | |
ccb1c31a | 648 | p->state = state; |
eca2a43b | 649 | rcu_assign_pointer(p->next, next); |
cfd56754 CW |
650 | hlist_add_head(&p->mglist, &port->mglist); |
651 | setup_timer(&p->timer, br_multicast_port_group_expired, | |
652 | (unsigned long)p); | |
653 | return p; | |
654 | } | |
655 | ||
eb1d1641 | 656 | static int br_multicast_add_group(struct net_bridge *br, |
8ef2a9a5 YH |
657 | struct net_bridge_port *port, |
658 | struct br_ip *group) | |
eb1d1641 HX |
659 | { |
660 | struct net_bridge_mdb_entry *mp; | |
661 | struct net_bridge_port_group *p; | |
e8051688 | 662 | struct net_bridge_port_group __rcu **pp; |
eb1d1641 HX |
663 | int err; |
664 | ||
eb1d1641 HX |
665 | spin_lock(&br->multicast_lock); |
666 | if (!netif_running(br->dev) || | |
667 | (port && port->state == BR_STATE_DISABLED)) | |
668 | goto out; | |
669 | ||
670 | mp = br_multicast_new_group(br, port, group); | |
671 | err = PTR_ERR(mp); | |
4c0833bc | 672 | if (IS_ERR(mp)) |
eb1d1641 HX |
673 | goto err; |
674 | ||
675 | if (!port) { | |
8a870178 | 676 | mp->mglist = true; |
eb1d1641 HX |
677 | goto out; |
678 | } | |
679 | ||
e8051688 ED |
680 | for (pp = &mp->ports; |
681 | (p = mlock_dereference(*pp, br)) != NULL; | |
682 | pp = &p->next) { | |
eb1d1641 | 683 | if (p->port == port) |
9f00b2e7 | 684 | goto out; |
eb1d1641 HX |
685 | if ((unsigned long)p->port < (unsigned long)port) |
686 | break; | |
687 | } | |
688 | ||
ccb1c31a | 689 | p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY); |
eb1d1641 HX |
690 | if (unlikely(!p)) |
691 | goto err; | |
eb1d1641 | 692 | rcu_assign_pointer(*pp, p); |
37a393bc | 693 | br_mdb_notify(br->dev, port, group, RTM_NEWMDB); |
eb1d1641 | 694 | |
eb1d1641 HX |
695 | out: |
696 | err = 0; | |
697 | ||
698 | err: | |
699 | spin_unlock(&br->multicast_lock); | |
700 | return err; | |
701 | } | |
702 | ||
8ef2a9a5 YH |
703 | static int br_ip4_multicast_add_group(struct net_bridge *br, |
704 | struct net_bridge_port *port, | |
b0e9a30d VY |
705 | __be32 group, |
706 | __u16 vid) | |
8ef2a9a5 YH |
707 | { |
708 | struct br_ip br_group; | |
709 | ||
710 | if (ipv4_is_local_multicast(group)) | |
711 | return 0; | |
712 | ||
713 | br_group.u.ip4 = group; | |
714 | br_group.proto = htons(ETH_P_IP); | |
b0e9a30d | 715 | br_group.vid = vid; |
8ef2a9a5 YH |
716 | |
717 | return br_multicast_add_group(br, port, &br_group); | |
718 | } | |
719 | ||
dfd56b8b | 720 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
721 | static int br_ip6_multicast_add_group(struct net_bridge *br, |
722 | struct net_bridge_port *port, | |
b0e9a30d VY |
723 | const struct in6_addr *group, |
724 | __u16 vid) | |
08b202b6 YH |
725 | { |
726 | struct br_ip br_group; | |
727 | ||
3c3769e6 | 728 | if (ipv6_addr_is_ll_all_nodes(group)) |
08b202b6 YH |
729 | return 0; |
730 | ||
4e3fd7a0 | 731 | br_group.u.ip6 = *group; |
9cc6e0c4 | 732 | br_group.proto = htons(ETH_P_IPV6); |
b0e9a30d | 733 | br_group.vid = vid; |
08b202b6 YH |
734 | |
735 | return br_multicast_add_group(br, port, &br_group); | |
736 | } | |
737 | #endif | |
738 | ||
eb1d1641 HX |
739 | static void br_multicast_router_expired(unsigned long data) |
740 | { | |
741 | struct net_bridge_port *port = (void *)data; | |
742 | struct net_bridge *br = port->br; | |
743 | ||
744 | spin_lock(&br->multicast_lock); | |
745 | if (port->multicast_router != 1 || | |
746 | timer_pending(&port->multicast_router_timer) || | |
747 | hlist_unhashed(&port->rlist)) | |
748 | goto out; | |
749 | ||
750 | hlist_del_init_rcu(&port->rlist); | |
751 | ||
752 | out: | |
753 | spin_unlock(&br->multicast_lock); | |
754 | } | |
755 | ||
756 | static void br_multicast_local_router_expired(unsigned long data) | |
757 | { | |
758 | } | |
759 | ||
cc0fdd80 LL |
760 | static void br_multicast_querier_expired(struct net_bridge *br, |
761 | struct bridge_mcast_query *query) | |
c83b8fab | 762 | { |
c83b8fab HX |
763 | spin_lock(&br->multicast_lock); |
764 | if (!netif_running(br->dev) || br->multicast_disabled) | |
765 | goto out; | |
766 | ||
cc0fdd80 | 767 | br_multicast_start_querier(br, query); |
c83b8fab HX |
768 | |
769 | out: | |
770 | spin_unlock(&br->multicast_lock); | |
771 | } | |
772 | ||
cc0fdd80 LL |
773 | static void br_ip4_multicast_querier_expired(unsigned long data) |
774 | { | |
775 | struct net_bridge *br = (void *)data; | |
776 | ||
777 | br_multicast_querier_expired(br, &br->ip4_query); | |
778 | } | |
779 | ||
780 | #if IS_ENABLED(CONFIG_IPV6) | |
781 | static void br_ip6_multicast_querier_expired(unsigned long data) | |
782 | { | |
783 | struct net_bridge *br = (void *)data; | |
784 | ||
785 | br_multicast_querier_expired(br, &br->ip6_query); | |
786 | } | |
787 | #endif | |
788 | ||
8ef2a9a5 YH |
789 | static void __br_multicast_send_query(struct net_bridge *br, |
790 | struct net_bridge_port *port, | |
791 | struct br_ip *ip) | |
eb1d1641 | 792 | { |
eb1d1641 HX |
793 | struct sk_buff *skb; |
794 | ||
8ef2a9a5 | 795 | skb = br_multicast_alloc_query(br, ip); |
eb1d1641 | 796 | if (!skb) |
8ef2a9a5 | 797 | return; |
eb1d1641 HX |
798 | |
799 | if (port) { | |
800 | __skb_push(skb, sizeof(struct ethhdr)); | |
801 | skb->dev = port->dev; | |
713aefa3 | 802 | NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, |
eb1d1641 HX |
803 | dev_queue_xmit); |
804 | } else | |
805 | netif_rx(skb); | |
8ef2a9a5 YH |
806 | } |
807 | ||
808 | static void br_multicast_send_query(struct net_bridge *br, | |
cc0fdd80 LL |
809 | struct net_bridge_port *port, |
810 | struct bridge_mcast_query *query) | |
8ef2a9a5 YH |
811 | { |
812 | unsigned long time; | |
813 | struct br_ip br_group; | |
cc0fdd80 | 814 | struct bridge_mcast_querier *querier = NULL; |
8ef2a9a5 YH |
815 | |
816 | if (!netif_running(br->dev) || br->multicast_disabled || | |
cc0fdd80 | 817 | !br->multicast_querier) |
8ef2a9a5 YH |
818 | return; |
819 | ||
08b202b6 YH |
820 | memset(&br_group.u, 0, sizeof(br_group.u)); |
821 | ||
cc0fdd80 LL |
822 | if (port ? (query == &port->ip4_query) : |
823 | (query == &br->ip4_query)) { | |
824 | querier = &br->ip4_querier; | |
825 | br_group.proto = htons(ETH_P_IP); | |
dfd56b8b | 826 | #if IS_ENABLED(CONFIG_IPV6) |
cc0fdd80 LL |
827 | } else { |
828 | querier = &br->ip6_querier; | |
829 | br_group.proto = htons(ETH_P_IPV6); | |
08b202b6 | 830 | #endif |
cc0fdd80 LL |
831 | } |
832 | ||
833 | if (!querier || timer_pending(&querier->timer)) | |
834 | return; | |
835 | ||
836 | __br_multicast_send_query(br, port, &br_group); | |
eb1d1641 | 837 | |
eb1d1641 | 838 | time = jiffies; |
cc0fdd80 | 839 | time += query->startup_sent < br->multicast_startup_query_count ? |
eb1d1641 HX |
840 | br->multicast_startup_query_interval : |
841 | br->multicast_query_interval; | |
cc0fdd80 | 842 | mod_timer(&query->timer, time); |
eb1d1641 HX |
843 | } |
844 | ||
cc0fdd80 LL |
845 | static void br_multicast_port_query_expired(struct net_bridge_port *port, |
846 | struct bridge_mcast_query *query) | |
eb1d1641 | 847 | { |
eb1d1641 HX |
848 | struct net_bridge *br = port->br; |
849 | ||
850 | spin_lock(&br->multicast_lock); | |
02a780c0 DC |
851 | if (port->state == BR_STATE_DISABLED || |
852 | port->state == BR_STATE_BLOCKING) | |
eb1d1641 HX |
853 | goto out; |
854 | ||
cc0fdd80 LL |
855 | if (query->startup_sent < br->multicast_startup_query_count) |
856 | query->startup_sent++; | |
eb1d1641 | 857 | |
cc0fdd80 | 858 | br_multicast_send_query(port->br, port, query); |
eb1d1641 HX |
859 | |
860 | out: | |
861 | spin_unlock(&br->multicast_lock); | |
862 | } | |
863 | ||
cc0fdd80 LL |
864 | static void br_ip4_multicast_port_query_expired(unsigned long data) |
865 | { | |
866 | struct net_bridge_port *port = (void *)data; | |
867 | ||
868 | br_multicast_port_query_expired(port, &port->ip4_query); | |
869 | } | |
870 | ||
871 | #if IS_ENABLED(CONFIG_IPV6) | |
872 | static void br_ip6_multicast_port_query_expired(unsigned long data) | |
873 | { | |
874 | struct net_bridge_port *port = (void *)data; | |
875 | ||
876 | br_multicast_port_query_expired(port, &port->ip6_query); | |
877 | } | |
878 | #endif | |
879 | ||
eb1d1641 HX |
880 | void br_multicast_add_port(struct net_bridge_port *port) |
881 | { | |
882 | port->multicast_router = 1; | |
883 | ||
884 | setup_timer(&port->multicast_router_timer, br_multicast_router_expired, | |
885 | (unsigned long)port); | |
cc0fdd80 LL |
886 | setup_timer(&port->ip4_query.timer, br_ip4_multicast_port_query_expired, |
887 | (unsigned long)port); | |
888 | #if IS_ENABLED(CONFIG_IPV6) | |
889 | setup_timer(&port->ip6_query.timer, br_ip6_multicast_port_query_expired, | |
890 | (unsigned long)port); | |
891 | #endif | |
eb1d1641 HX |
892 | } |
893 | ||
894 | void br_multicast_del_port(struct net_bridge_port *port) | |
895 | { | |
896 | del_timer_sync(&port->multicast_router_timer); | |
897 | } | |
898 | ||
cc0fdd80 | 899 | static void br_multicast_enable(struct bridge_mcast_query *query) |
561f1103 | 900 | { |
cc0fdd80 | 901 | query->startup_sent = 0; |
561f1103 | 902 | |
cc0fdd80 LL |
903 | if (try_to_del_timer_sync(&query->timer) >= 0 || |
904 | del_timer(&query->timer)) | |
905 | mod_timer(&query->timer, jiffies); | |
561f1103 HX |
906 | } |
907 | ||
eb1d1641 HX |
908 | void br_multicast_enable_port(struct net_bridge_port *port) |
909 | { | |
910 | struct net_bridge *br = port->br; | |
911 | ||
912 | spin_lock(&br->multicast_lock); | |
913 | if (br->multicast_disabled || !netif_running(br->dev)) | |
914 | goto out; | |
915 | ||
cc0fdd80 LL |
916 | br_multicast_enable(&port->ip4_query); |
917 | #if IS_ENABLED(CONFIG_IPV6) | |
918 | br_multicast_enable(&port->ip6_query); | |
919 | #endif | |
eb1d1641 HX |
920 | |
921 | out: | |
922 | spin_unlock(&br->multicast_lock); | |
923 | } | |
924 | ||
925 | void br_multicast_disable_port(struct net_bridge_port *port) | |
926 | { | |
927 | struct net_bridge *br = port->br; | |
928 | struct net_bridge_port_group *pg; | |
b67bfe0d | 929 | struct hlist_node *n; |
eb1d1641 HX |
930 | |
931 | spin_lock(&br->multicast_lock); | |
b67bfe0d | 932 | hlist_for_each_entry_safe(pg, n, &port->mglist, mglist) |
eb1d1641 HX |
933 | br_multicast_del_pg(br, pg); |
934 | ||
935 | if (!hlist_unhashed(&port->rlist)) | |
936 | hlist_del_init_rcu(&port->rlist); | |
937 | del_timer(&port->multicast_router_timer); | |
cc0fdd80 LL |
938 | del_timer(&port->ip4_query.timer); |
939 | #if IS_ENABLED(CONFIG_IPV6) | |
940 | del_timer(&port->ip6_query.timer); | |
941 | #endif | |
eb1d1641 HX |
942 | spin_unlock(&br->multicast_lock); |
943 | } | |
944 | ||
8ef2a9a5 YH |
945 | static int br_ip4_multicast_igmp3_report(struct net_bridge *br, |
946 | struct net_bridge_port *port, | |
947 | struct sk_buff *skb) | |
eb1d1641 HX |
948 | { |
949 | struct igmpv3_report *ih; | |
950 | struct igmpv3_grec *grec; | |
951 | int i; | |
952 | int len; | |
953 | int num; | |
954 | int type; | |
955 | int err = 0; | |
956 | __be32 group; | |
b0e9a30d | 957 | u16 vid = 0; |
eb1d1641 HX |
958 | |
959 | if (!pskb_may_pull(skb, sizeof(*ih))) | |
960 | return -EINVAL; | |
961 | ||
b0e9a30d | 962 | br_vlan_get_tag(skb, &vid); |
eb1d1641 HX |
963 | ih = igmpv3_report_hdr(skb); |
964 | num = ntohs(ih->ngrec); | |
965 | len = sizeof(*ih); | |
966 | ||
967 | for (i = 0; i < num; i++) { | |
968 | len += sizeof(*grec); | |
969 | if (!pskb_may_pull(skb, len)) | |
970 | return -EINVAL; | |
971 | ||
fd218cf9 | 972 | grec = (void *)(skb->data + len - sizeof(*grec)); |
eb1d1641 HX |
973 | group = grec->grec_mca; |
974 | type = grec->grec_type; | |
975 | ||
8eabf95c | 976 | len += ntohs(grec->grec_nsrcs) * 4; |
eb1d1641 HX |
977 | if (!pskb_may_pull(skb, len)) |
978 | return -EINVAL; | |
979 | ||
980 | /* We treat this as an IGMPv2 report for now. */ | |
981 | switch (type) { | |
982 | case IGMPV3_MODE_IS_INCLUDE: | |
983 | case IGMPV3_MODE_IS_EXCLUDE: | |
984 | case IGMPV3_CHANGE_TO_INCLUDE: | |
985 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
986 | case IGMPV3_ALLOW_NEW_SOURCES: | |
987 | case IGMPV3_BLOCK_OLD_SOURCES: | |
988 | break; | |
989 | ||
990 | default: | |
991 | continue; | |
992 | } | |
993 | ||
b0e9a30d | 994 | err = br_ip4_multicast_add_group(br, port, group, vid); |
eb1d1641 HX |
995 | if (err) |
996 | break; | |
997 | } | |
998 | ||
999 | return err; | |
1000 | } | |
1001 | ||
dfd56b8b | 1002 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1003 | static int br_ip6_multicast_mld2_report(struct net_bridge *br, |
1004 | struct net_bridge_port *port, | |
1005 | struct sk_buff *skb) | |
1006 | { | |
1007 | struct icmp6hdr *icmp6h; | |
1008 | struct mld2_grec *grec; | |
1009 | int i; | |
1010 | int len; | |
1011 | int num; | |
1012 | int err = 0; | |
b0e9a30d | 1013 | u16 vid = 0; |
08b202b6 YH |
1014 | |
1015 | if (!pskb_may_pull(skb, sizeof(*icmp6h))) | |
1016 | return -EINVAL; | |
1017 | ||
b0e9a30d | 1018 | br_vlan_get_tag(skb, &vid); |
08b202b6 YH |
1019 | icmp6h = icmp6_hdr(skb); |
1020 | num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); | |
1021 | len = sizeof(*icmp6h); | |
1022 | ||
1023 | for (i = 0; i < num; i++) { | |
1024 | __be16 *nsrcs, _nsrcs; | |
1025 | ||
1026 | nsrcs = skb_header_pointer(skb, | |
1027 | len + offsetof(struct mld2_grec, | |
649e984d | 1028 | grec_nsrcs), |
08b202b6 YH |
1029 | sizeof(_nsrcs), &_nsrcs); |
1030 | if (!nsrcs) | |
1031 | return -EINVAL; | |
1032 | ||
1033 | if (!pskb_may_pull(skb, | |
1034 | len + sizeof(*grec) + | |
d41db9f3 | 1035 | sizeof(struct in6_addr) * ntohs(*nsrcs))) |
08b202b6 YH |
1036 | return -EINVAL; |
1037 | ||
1038 | grec = (struct mld2_grec *)(skb->data + len); | |
d41db9f3 LL |
1039 | len += sizeof(*grec) + |
1040 | sizeof(struct in6_addr) * ntohs(*nsrcs); | |
08b202b6 YH |
1041 | |
1042 | /* We treat these as MLDv1 reports for now. */ | |
1043 | switch (grec->grec_type) { | |
1044 | case MLD2_MODE_IS_INCLUDE: | |
1045 | case MLD2_MODE_IS_EXCLUDE: | |
1046 | case MLD2_CHANGE_TO_INCLUDE: | |
1047 | case MLD2_CHANGE_TO_EXCLUDE: | |
1048 | case MLD2_ALLOW_NEW_SOURCES: | |
1049 | case MLD2_BLOCK_OLD_SOURCES: | |
1050 | break; | |
1051 | ||
1052 | default: | |
1053 | continue; | |
1054 | } | |
1055 | ||
b0e9a30d VY |
1056 | err = br_ip6_multicast_add_group(br, port, &grec->grec_mca, |
1057 | vid); | |
08b202b6 YH |
1058 | if (!err) |
1059 | break; | |
1060 | } | |
1061 | ||
1062 | return err; | |
1063 | } | |
1064 | #endif | |
1065 | ||
cc0fdd80 LL |
1066 | static void |
1067 | br_multicast_update_querier_timer(struct net_bridge *br, | |
1068 | struct bridge_mcast_querier *querier, | |
1069 | unsigned long max_delay) | |
b00589af | 1070 | { |
cc0fdd80 LL |
1071 | if (!timer_pending(&querier->timer)) |
1072 | querier->delay_time = jiffies + max_delay; | |
b00589af | 1073 | |
cc0fdd80 | 1074 | mod_timer(&querier->timer, jiffies + br->multicast_querier_interval); |
b00589af LL |
1075 | } |
1076 | ||
7e80c124 | 1077 | /* |
7c77602f | 1078 | * Add port to router_list |
7e80c124 | 1079 | * list is maintained ordered by pointer value |
1080 | * and locked by br->multicast_lock and RCU | |
1081 | */ | |
0909e117 HX |
1082 | static void br_multicast_add_router(struct net_bridge *br, |
1083 | struct net_bridge_port *port) | |
1084 | { | |
dcdca2c4 | 1085 | struct net_bridge_port *p; |
b67bfe0d | 1086 | struct hlist_node *slot = NULL; |
dcdca2c4 | 1087 | |
b67bfe0d | 1088 | hlist_for_each_entry(p, &br->router_list, rlist) { |
7e80c124 | 1089 | if ((unsigned long) port >= (unsigned long) p) |
1090 | break; | |
b67bfe0d | 1091 | slot = &p->rlist; |
dcdca2c4 | 1092 | } |
1093 | ||
7e80c124 | 1094 | if (slot) |
1095 | hlist_add_after_rcu(slot, &port->rlist); | |
dcdca2c4 | 1096 | else |
1097 | hlist_add_head_rcu(&port->rlist, &br->router_list); | |
0909e117 HX |
1098 | } |
1099 | ||
eb1d1641 HX |
1100 | static void br_multicast_mark_router(struct net_bridge *br, |
1101 | struct net_bridge_port *port) | |
1102 | { | |
1103 | unsigned long now = jiffies; | |
eb1d1641 HX |
1104 | |
1105 | if (!port) { | |
1106 | if (br->multicast_router == 1) | |
1107 | mod_timer(&br->multicast_router_timer, | |
1108 | now + br->multicast_querier_interval); | |
1109 | return; | |
1110 | } | |
1111 | ||
1112 | if (port->multicast_router != 1) | |
1113 | return; | |
1114 | ||
1115 | if (!hlist_unhashed(&port->rlist)) | |
1116 | goto timer; | |
1117 | ||
0909e117 | 1118 | br_multicast_add_router(br, port); |
eb1d1641 HX |
1119 | |
1120 | timer: | |
1121 | mod_timer(&port->multicast_router_timer, | |
1122 | now + br->multicast_querier_interval); | |
1123 | } | |
1124 | ||
1125 | static void br_multicast_query_received(struct net_bridge *br, | |
1126 | struct net_bridge_port *port, | |
cc0fdd80 | 1127 | struct bridge_mcast_querier *querier, |
b00589af LL |
1128 | int saddr, |
1129 | unsigned long max_delay) | |
eb1d1641 HX |
1130 | { |
1131 | if (saddr) | |
cc0fdd80 LL |
1132 | br_multicast_update_querier_timer(br, querier, max_delay); |
1133 | else if (timer_pending(&querier->timer)) | |
eb1d1641 HX |
1134 | return; |
1135 | ||
1136 | br_multicast_mark_router(br, port); | |
1137 | } | |
1138 | ||
8ef2a9a5 YH |
1139 | static int br_ip4_multicast_query(struct net_bridge *br, |
1140 | struct net_bridge_port *port, | |
1141 | struct sk_buff *skb) | |
eb1d1641 | 1142 | { |
b71d1d42 | 1143 | const struct iphdr *iph = ip_hdr(skb); |
eb1d1641 HX |
1144 | struct igmphdr *ih = igmp_hdr(skb); |
1145 | struct net_bridge_mdb_entry *mp; | |
1146 | struct igmpv3_query *ih3; | |
1147 | struct net_bridge_port_group *p; | |
e8051688 | 1148 | struct net_bridge_port_group __rcu **pp; |
eb1d1641 HX |
1149 | unsigned long max_delay; |
1150 | unsigned long now = jiffies; | |
1151 | __be32 group; | |
bec68ff1 | 1152 | int err = 0; |
b0e9a30d | 1153 | u16 vid = 0; |
eb1d1641 HX |
1154 | |
1155 | spin_lock(&br->multicast_lock); | |
1156 | if (!netif_running(br->dev) || | |
1157 | (port && port->state == BR_STATE_DISABLED)) | |
1158 | goto out; | |
1159 | ||
eb1d1641 HX |
1160 | group = ih->group; |
1161 | ||
1162 | if (skb->len == sizeof(*ih)) { | |
1163 | max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); | |
1164 | ||
1165 | if (!max_delay) { | |
1166 | max_delay = 10 * HZ; | |
1167 | group = 0; | |
1168 | } | |
1169 | } else { | |
bec68ff1 YH |
1170 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) { |
1171 | err = -EINVAL; | |
1172 | goto out; | |
1173 | } | |
eb1d1641 HX |
1174 | |
1175 | ih3 = igmpv3_query_hdr(skb); | |
1176 | if (ih3->nsrcs) | |
bec68ff1 | 1177 | goto out; |
eb1d1641 | 1178 | |
0ba8c9ec YH |
1179 | max_delay = ih3->code ? |
1180 | IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; | |
eb1d1641 HX |
1181 | } |
1182 | ||
cc0fdd80 LL |
1183 | br_multicast_query_received(br, port, &br->ip4_querier, !!iph->saddr, |
1184 | max_delay); | |
b00589af | 1185 | |
eb1d1641 HX |
1186 | if (!group) |
1187 | goto out; | |
1188 | ||
b0e9a30d VY |
1189 | br_vlan_get_tag(skb, &vid); |
1190 | mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid); | |
eb1d1641 HX |
1191 | if (!mp) |
1192 | goto out; | |
1193 | ||
9f00b2e7 CW |
1194 | mod_timer(&mp->timer, now + br->multicast_membership_interval); |
1195 | mp->timer_armed = true; | |
1196 | ||
eb1d1641 HX |
1197 | max_delay *= br->multicast_last_member_count; |
1198 | ||
8a870178 | 1199 | if (mp->mglist && |
eb1d1641 HX |
1200 | (timer_pending(&mp->timer) ? |
1201 | time_after(mp->timer.expires, now + max_delay) : | |
1202 | try_to_del_timer_sync(&mp->timer) >= 0)) | |
1203 | mod_timer(&mp->timer, now + max_delay); | |
1204 | ||
e8051688 ED |
1205 | for (pp = &mp->ports; |
1206 | (p = mlock_dereference(*pp, br)) != NULL; | |
1207 | pp = &p->next) { | |
eb1d1641 HX |
1208 | if (timer_pending(&p->timer) ? |
1209 | time_after(p->timer.expires, now + max_delay) : | |
1210 | try_to_del_timer_sync(&p->timer) >= 0) | |
24f9cdcb | 1211 | mod_timer(&p->timer, now + max_delay); |
eb1d1641 HX |
1212 | } |
1213 | ||
1214 | out: | |
1215 | spin_unlock(&br->multicast_lock); | |
bec68ff1 | 1216 | return err; |
eb1d1641 HX |
1217 | } |
1218 | ||
dfd56b8b | 1219 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1220 | static int br_ip6_multicast_query(struct net_bridge *br, |
1221 | struct net_bridge_port *port, | |
1222 | struct sk_buff *skb) | |
1223 | { | |
b71d1d42 | 1224 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
eca2a43b | 1225 | struct mld_msg *mld; |
08b202b6 YH |
1226 | struct net_bridge_mdb_entry *mp; |
1227 | struct mld2_query *mld2q; | |
e8051688 ED |
1228 | struct net_bridge_port_group *p; |
1229 | struct net_bridge_port_group __rcu **pp; | |
08b202b6 YH |
1230 | unsigned long max_delay; |
1231 | unsigned long now = jiffies; | |
b71d1d42 | 1232 | const struct in6_addr *group = NULL; |
08b202b6 | 1233 | int err = 0; |
b0e9a30d | 1234 | u16 vid = 0; |
08b202b6 YH |
1235 | |
1236 | spin_lock(&br->multicast_lock); | |
1237 | if (!netif_running(br->dev) || | |
1238 | (port && port->state == BR_STATE_DISABLED)) | |
1239 | goto out; | |
1240 | ||
08b202b6 YH |
1241 | if (skb->len == sizeof(*mld)) { |
1242 | if (!pskb_may_pull(skb, sizeof(*mld))) { | |
1243 | err = -EINVAL; | |
1244 | goto out; | |
1245 | } | |
1246 | mld = (struct mld_msg *) icmp6_hdr(skb); | |
4715213d | 1247 | max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay)); |
08b202b6 YH |
1248 | if (max_delay) |
1249 | group = &mld->mld_mca; | |
248ba8ec | 1250 | } else { |
08b202b6 YH |
1251 | if (!pskb_may_pull(skb, sizeof(*mld2q))) { |
1252 | err = -EINVAL; | |
1253 | goto out; | |
1254 | } | |
1255 | mld2q = (struct mld2_query *)icmp6_hdr(skb); | |
1256 | if (!mld2q->mld2q_nsrcs) | |
1257 | group = &mld2q->mld2q_mca; | |
e3f5b170 DB |
1258 | |
1259 | max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL); | |
08b202b6 YH |
1260 | } |
1261 | ||
cc0fdd80 LL |
1262 | br_multicast_query_received(br, port, &br->ip6_querier, |
1263 | !ipv6_addr_any(&ip6h->saddr), max_delay); | |
b00589af | 1264 | |
08b202b6 YH |
1265 | if (!group) |
1266 | goto out; | |
1267 | ||
b0e9a30d VY |
1268 | br_vlan_get_tag(skb, &vid); |
1269 | mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid); | |
08b202b6 YH |
1270 | if (!mp) |
1271 | goto out; | |
1272 | ||
9f00b2e7 CW |
1273 | mod_timer(&mp->timer, now + br->multicast_membership_interval); |
1274 | mp->timer_armed = true; | |
1275 | ||
08b202b6 | 1276 | max_delay *= br->multicast_last_member_count; |
8a870178 | 1277 | if (mp->mglist && |
08b202b6 YH |
1278 | (timer_pending(&mp->timer) ? |
1279 | time_after(mp->timer.expires, now + max_delay) : | |
1280 | try_to_del_timer_sync(&mp->timer) >= 0)) | |
1281 | mod_timer(&mp->timer, now + max_delay); | |
1282 | ||
e8051688 ED |
1283 | for (pp = &mp->ports; |
1284 | (p = mlock_dereference(*pp, br)) != NULL; | |
1285 | pp = &p->next) { | |
08b202b6 YH |
1286 | if (timer_pending(&p->timer) ? |
1287 | time_after(p->timer.expires, now + max_delay) : | |
1288 | try_to_del_timer_sync(&p->timer) >= 0) | |
24f9cdcb | 1289 | mod_timer(&p->timer, now + max_delay); |
08b202b6 YH |
1290 | } |
1291 | ||
1292 | out: | |
1293 | spin_unlock(&br->multicast_lock); | |
1294 | return err; | |
1295 | } | |
1296 | #endif | |
1297 | ||
eb1d1641 HX |
1298 | static void br_multicast_leave_group(struct net_bridge *br, |
1299 | struct net_bridge_port *port, | |
cc0fdd80 LL |
1300 | struct br_ip *group, |
1301 | struct bridge_mcast_querier *querier, | |
1302 | struct bridge_mcast_query *query) | |
eb1d1641 HX |
1303 | { |
1304 | struct net_bridge_mdb_htable *mdb; | |
1305 | struct net_bridge_mdb_entry *mp; | |
1306 | struct net_bridge_port_group *p; | |
1307 | unsigned long now; | |
1308 | unsigned long time; | |
1309 | ||
eb1d1641 HX |
1310 | spin_lock(&br->multicast_lock); |
1311 | if (!netif_running(br->dev) || | |
1312 | (port && port->state == BR_STATE_DISABLED) || | |
cc0fdd80 | 1313 | timer_pending(&querier->timer)) |
eb1d1641 HX |
1314 | goto out; |
1315 | ||
e8051688 | 1316 | mdb = mlock_dereference(br->mdb, br); |
eb1d1641 HX |
1317 | mp = br_mdb_ip_get(mdb, group); |
1318 | if (!mp) | |
1319 | goto out; | |
1320 | ||
cc0fdd80 | 1321 | if (br->multicast_querier) { |
6b7df111 CW |
1322 | __br_multicast_send_query(br, port, &mp->addr); |
1323 | ||
1324 | time = jiffies + br->multicast_last_member_count * | |
1325 | br->multicast_last_member_interval; | |
cc0fdd80 LL |
1326 | |
1327 | mod_timer(&query->timer, time); | |
6b7df111 CW |
1328 | |
1329 | for (p = mlock_dereference(mp->ports, br); | |
1330 | p != NULL; | |
1331 | p = mlock_dereference(p->next, br)) { | |
1332 | if (p->port != port) | |
1333 | continue; | |
1334 | ||
1335 | if (!hlist_unhashed(&p->mglist) && | |
1336 | (timer_pending(&p->timer) ? | |
1337 | time_after(p->timer.expires, time) : | |
1338 | try_to_del_timer_sync(&p->timer) >= 0)) { | |
1339 | mod_timer(&p->timer, time); | |
1340 | } | |
1341 | ||
1342 | break; | |
1343 | } | |
1344 | } | |
1345 | ||
c2d3babf | 1346 | if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) { |
50426b59 AW |
1347 | struct net_bridge_port_group __rcu **pp; |
1348 | ||
1349 | for (pp = &mp->ports; | |
1350 | (p = mlock_dereference(*pp, br)) != NULL; | |
1351 | pp = &p->next) { | |
1352 | if (p->port != port) | |
1353 | continue; | |
1354 | ||
1355 | rcu_assign_pointer(*pp, p->next); | |
1356 | hlist_del_init(&p->mglist); | |
1357 | del_timer(&p->timer); | |
1358 | call_rcu_bh(&p->rcu, br_multicast_free_pg); | |
37a393bc | 1359 | br_mdb_notify(br->dev, port, group, RTM_DELMDB); |
50426b59 | 1360 | |
9f00b2e7 | 1361 | if (!mp->ports && !mp->mglist && mp->timer_armed && |
50426b59 AW |
1362 | netif_running(br->dev)) |
1363 | mod_timer(&mp->timer, jiffies); | |
1364 | } | |
1365 | goto out; | |
1366 | } | |
1367 | ||
eb1d1641 HX |
1368 | now = jiffies; |
1369 | time = now + br->multicast_last_member_count * | |
1370 | br->multicast_last_member_interval; | |
1371 | ||
1372 | if (!port) { | |
9f00b2e7 | 1373 | if (mp->mglist && mp->timer_armed && |
eb1d1641 HX |
1374 | (timer_pending(&mp->timer) ? |
1375 | time_after(mp->timer.expires, time) : | |
1376 | try_to_del_timer_sync(&mp->timer) >= 0)) { | |
1377 | mod_timer(&mp->timer, time); | |
eb1d1641 | 1378 | } |
eb1d1641 | 1379 | } |
eb1d1641 HX |
1380 | out: |
1381 | spin_unlock(&br->multicast_lock); | |
1382 | } | |
1383 | ||
8ef2a9a5 YH |
1384 | static void br_ip4_multicast_leave_group(struct net_bridge *br, |
1385 | struct net_bridge_port *port, | |
b0e9a30d VY |
1386 | __be32 group, |
1387 | __u16 vid) | |
8ef2a9a5 YH |
1388 | { |
1389 | struct br_ip br_group; | |
cc0fdd80 LL |
1390 | struct bridge_mcast_query *query = port ? &port->ip4_query : |
1391 | &br->ip4_query; | |
8ef2a9a5 YH |
1392 | |
1393 | if (ipv4_is_local_multicast(group)) | |
1394 | return; | |
1395 | ||
1396 | br_group.u.ip4 = group; | |
1397 | br_group.proto = htons(ETH_P_IP); | |
b0e9a30d | 1398 | br_group.vid = vid; |
8ef2a9a5 | 1399 | |
cc0fdd80 | 1400 | br_multicast_leave_group(br, port, &br_group, &br->ip4_querier, query); |
8ef2a9a5 YH |
1401 | } |
1402 | ||
dfd56b8b | 1403 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1404 | static void br_ip6_multicast_leave_group(struct net_bridge *br, |
1405 | struct net_bridge_port *port, | |
b0e9a30d VY |
1406 | const struct in6_addr *group, |
1407 | __u16 vid) | |
08b202b6 YH |
1408 | { |
1409 | struct br_ip br_group; | |
cc0fdd80 LL |
1410 | struct bridge_mcast_query *query = port ? &port->ip6_query : |
1411 | &br->ip6_query; | |
1412 | ||
08b202b6 | 1413 | |
3c3769e6 | 1414 | if (ipv6_addr_is_ll_all_nodes(group)) |
08b202b6 YH |
1415 | return; |
1416 | ||
4e3fd7a0 | 1417 | br_group.u.ip6 = *group; |
08b202b6 | 1418 | br_group.proto = htons(ETH_P_IPV6); |
b0e9a30d | 1419 | br_group.vid = vid; |
08b202b6 | 1420 | |
cc0fdd80 | 1421 | br_multicast_leave_group(br, port, &br_group, &br->ip6_querier, query); |
08b202b6 YH |
1422 | } |
1423 | #endif | |
8ef2a9a5 | 1424 | |
eb1d1641 HX |
1425 | static int br_multicast_ipv4_rcv(struct net_bridge *br, |
1426 | struct net_bridge_port *port, | |
1427 | struct sk_buff *skb) | |
1428 | { | |
1429 | struct sk_buff *skb2 = skb; | |
b71d1d42 | 1430 | const struct iphdr *iph; |
eb1d1641 | 1431 | struct igmphdr *ih; |
95c96174 ED |
1432 | unsigned int len; |
1433 | unsigned int offset; | |
eb1d1641 | 1434 | int err; |
b0e9a30d | 1435 | u16 vid = 0; |
eb1d1641 | 1436 | |
eb1d1641 HX |
1437 | /* We treat OOM as packet loss for now. */ |
1438 | if (!pskb_may_pull(skb, sizeof(*iph))) | |
1439 | return -EINVAL; | |
1440 | ||
1441 | iph = ip_hdr(skb); | |
1442 | ||
1443 | if (iph->ihl < 5 || iph->version != 4) | |
1444 | return -EINVAL; | |
1445 | ||
1446 | if (!pskb_may_pull(skb, ip_hdrlen(skb))) | |
1447 | return -EINVAL; | |
1448 | ||
1449 | iph = ip_hdr(skb); | |
1450 | ||
1451 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
1452 | return -EINVAL; | |
1453 | ||
bd4265fe | 1454 | if (iph->protocol != IPPROTO_IGMP) { |
bf5e4dd6 | 1455 | if (!ipv4_is_local_multicast(iph->daddr)) |
bd4265fe | 1456 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
eb1d1641 | 1457 | return 0; |
bd4265fe | 1458 | } |
eb1d1641 HX |
1459 | |
1460 | len = ntohs(iph->tot_len); | |
1461 | if (skb->len < len || len < ip_hdrlen(skb)) | |
1462 | return -EINVAL; | |
1463 | ||
1464 | if (skb->len > len) { | |
1465 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1466 | if (!skb2) | |
1467 | return -ENOMEM; | |
1468 | ||
1469 | err = pskb_trim_rcsum(skb2, len); | |
1470 | if (err) | |
8440853b | 1471 | goto err_out; |
eb1d1641 HX |
1472 | } |
1473 | ||
1474 | len -= ip_hdrlen(skb2); | |
1475 | offset = skb_network_offset(skb2) + ip_hdrlen(skb2); | |
1476 | __skb_pull(skb2, offset); | |
1477 | skb_reset_transport_header(skb2); | |
1478 | ||
1479 | err = -EINVAL; | |
1480 | if (!pskb_may_pull(skb2, sizeof(*ih))) | |
1481 | goto out; | |
1482 | ||
eb1d1641 HX |
1483 | switch (skb2->ip_summed) { |
1484 | case CHECKSUM_COMPLETE: | |
1485 | if (!csum_fold(skb2->csum)) | |
1486 | break; | |
1487 | /* fall through */ | |
1488 | case CHECKSUM_NONE: | |
1489 | skb2->csum = 0; | |
1490 | if (skb_checksum_complete(skb2)) | |
8440853b | 1491 | goto out; |
eb1d1641 HX |
1492 | } |
1493 | ||
1494 | err = 0; | |
1495 | ||
b0e9a30d | 1496 | br_vlan_get_tag(skb2, &vid); |
eb1d1641 HX |
1497 | BR_INPUT_SKB_CB(skb)->igmp = 1; |
1498 | ih = igmp_hdr(skb2); | |
1499 | ||
1500 | switch (ih->type) { | |
1501 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1502 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
62b2bcb4 | 1503 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
b0e9a30d | 1504 | err = br_ip4_multicast_add_group(br, port, ih->group, vid); |
eb1d1641 HX |
1505 | break; |
1506 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
8ef2a9a5 | 1507 | err = br_ip4_multicast_igmp3_report(br, port, skb2); |
eb1d1641 HX |
1508 | break; |
1509 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
8ef2a9a5 | 1510 | err = br_ip4_multicast_query(br, port, skb2); |
eb1d1641 HX |
1511 | break; |
1512 | case IGMP_HOST_LEAVE_MESSAGE: | |
b0e9a30d | 1513 | br_ip4_multicast_leave_group(br, port, ih->group, vid); |
eb1d1641 HX |
1514 | break; |
1515 | } | |
1516 | ||
1517 | out: | |
1518 | __skb_push(skb2, offset); | |
8440853b | 1519 | err_out: |
eb1d1641 HX |
1520 | if (skb2 != skb) |
1521 | kfree_skb(skb2); | |
1522 | return err; | |
1523 | } | |
1524 | ||
dfd56b8b | 1525 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1526 | static int br_multicast_ipv6_rcv(struct net_bridge *br, |
1527 | struct net_bridge_port *port, | |
1528 | struct sk_buff *skb) | |
1529 | { | |
9d89081d | 1530 | struct sk_buff *skb2; |
b71d1d42 | 1531 | const struct ipv6hdr *ip6h; |
22df1331 | 1532 | u8 icmp6_type; |
08b202b6 | 1533 | u8 nexthdr; |
75f2811c | 1534 | __be16 frag_off; |
95c96174 | 1535 | unsigned int len; |
bb7a0bd6 | 1536 | int offset; |
08b202b6 | 1537 | int err; |
b0e9a30d | 1538 | u16 vid = 0; |
08b202b6 | 1539 | |
08b202b6 YH |
1540 | if (!pskb_may_pull(skb, sizeof(*ip6h))) |
1541 | return -EINVAL; | |
1542 | ||
1543 | ip6h = ipv6_hdr(skb); | |
1544 | ||
1545 | /* | |
1546 | * We're interested in MLD messages only. | |
1547 | * - Version is 6 | |
1548 | * - MLD has always Router Alert hop-by-hop option | |
1549 | * - But we do not support jumbrograms. | |
1550 | */ | |
8fad9c39 LL |
1551 | if (ip6h->version != 6) |
1552 | return 0; | |
1553 | ||
1554 | /* Prevent flooding this packet if there is no listener present */ | |
3c3769e6 | 1555 | if (!ipv6_addr_is_ll_all_nodes(&ip6h->daddr)) |
8fad9c39 LL |
1556 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
1557 | ||
1558 | if (ip6h->nexthdr != IPPROTO_HOPOPTS || | |
08b202b6 YH |
1559 | ip6h->payload_len == 0) |
1560 | return 0; | |
1561 | ||
ff9a57a6 | 1562 | len = ntohs(ip6h->payload_len) + sizeof(*ip6h); |
08b202b6 YH |
1563 | if (skb->len < len) |
1564 | return -EINVAL; | |
1565 | ||
1566 | nexthdr = ip6h->nexthdr; | |
75f2811c | 1567 | offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off); |
08b202b6 YH |
1568 | |
1569 | if (offset < 0 || nexthdr != IPPROTO_ICMPV6) | |
1570 | return 0; | |
1571 | ||
1572 | /* Okay, we found ICMPv6 header */ | |
1573 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1574 | if (!skb2) | |
1575 | return -ENOMEM; | |
1576 | ||
9d89081d TW |
1577 | err = -EINVAL; |
1578 | if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr))) | |
1579 | goto out; | |
1580 | ||
08b202b6 YH |
1581 | len -= offset - skb_network_offset(skb2); |
1582 | ||
1583 | __skb_pull(skb2, offset); | |
1584 | skb_reset_transport_header(skb2); | |
fa2da8cd | 1585 | skb_postpull_rcsum(skb2, skb_network_header(skb2), |
1586 | skb_network_header_len(skb2)); | |
08b202b6 | 1587 | |
22df1331 | 1588 | icmp6_type = icmp6_hdr(skb2)->icmp6_type; |
08b202b6 | 1589 | |
22df1331 | 1590 | switch (icmp6_type) { |
08b202b6 YH |
1591 | case ICMPV6_MGM_QUERY: |
1592 | case ICMPV6_MGM_REPORT: | |
1593 | case ICMPV6_MGM_REDUCTION: | |
1594 | case ICMPV6_MLD2_REPORT: | |
1595 | break; | |
1596 | default: | |
1597 | err = 0; | |
1598 | goto out; | |
1599 | } | |
1600 | ||
1601 | /* Okay, we found MLD message. Check further. */ | |
1602 | if (skb2->len > len) { | |
1603 | err = pskb_trim_rcsum(skb2, len); | |
1604 | if (err) | |
1605 | goto out; | |
4b275d7e | 1606 | err = -EINVAL; |
08b202b6 YH |
1607 | } |
1608 | ||
4b275d7e YZ |
1609 | ip6h = ipv6_hdr(skb2); |
1610 | ||
08b202b6 YH |
1611 | switch (skb2->ip_summed) { |
1612 | case CHECKSUM_COMPLETE: | |
4b275d7e YZ |
1613 | if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len, |
1614 | IPPROTO_ICMPV6, skb2->csum)) | |
08b202b6 YH |
1615 | break; |
1616 | /*FALLTHROUGH*/ | |
1617 | case CHECKSUM_NONE: | |
4b275d7e YZ |
1618 | skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr, |
1619 | &ip6h->daddr, | |
1620 | skb2->len, | |
1621 | IPPROTO_ICMPV6, 0)); | |
1622 | if (__skb_checksum_complete(skb2)) | |
08b202b6 YH |
1623 | goto out; |
1624 | } | |
1625 | ||
1626 | err = 0; | |
1627 | ||
b0e9a30d | 1628 | br_vlan_get_tag(skb, &vid); |
08b202b6 YH |
1629 | BR_INPUT_SKB_CB(skb)->igmp = 1; |
1630 | ||
22df1331 | 1631 | switch (icmp6_type) { |
08b202b6 YH |
1632 | case ICMPV6_MGM_REPORT: |
1633 | { | |
9d89081d TW |
1634 | struct mld_msg *mld; |
1635 | if (!pskb_may_pull(skb2, sizeof(*mld))) { | |
1636 | err = -EINVAL; | |
1637 | goto out; | |
1638 | } | |
1639 | mld = (struct mld_msg *)skb_transport_header(skb2); | |
fc2af6c7 | 1640 | BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
b0e9a30d | 1641 | err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid); |
08b202b6 YH |
1642 | break; |
1643 | } | |
1644 | case ICMPV6_MLD2_REPORT: | |
1645 | err = br_ip6_multicast_mld2_report(br, port, skb2); | |
1646 | break; | |
1647 | case ICMPV6_MGM_QUERY: | |
1648 | err = br_ip6_multicast_query(br, port, skb2); | |
1649 | break; | |
1650 | case ICMPV6_MGM_REDUCTION: | |
1651 | { | |
9d89081d TW |
1652 | struct mld_msg *mld; |
1653 | if (!pskb_may_pull(skb2, sizeof(*mld))) { | |
1654 | err = -EINVAL; | |
1655 | goto out; | |
1656 | } | |
1657 | mld = (struct mld_msg *)skb_transport_header(skb2); | |
b0e9a30d | 1658 | br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid); |
08b202b6 YH |
1659 | } |
1660 | } | |
1661 | ||
1662 | out: | |
9d89081d | 1663 | kfree_skb(skb2); |
08b202b6 YH |
1664 | return err; |
1665 | } | |
1666 | #endif | |
1667 | ||
eb1d1641 HX |
1668 | int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, |
1669 | struct sk_buff *skb) | |
1670 | { | |
1fafc7a9 YH |
1671 | BR_INPUT_SKB_CB(skb)->igmp = 0; |
1672 | BR_INPUT_SKB_CB(skb)->mrouters_only = 0; | |
1673 | ||
eb1d1641 HX |
1674 | if (br->multicast_disabled) |
1675 | return 0; | |
1676 | ||
1677 | switch (skb->protocol) { | |
1678 | case htons(ETH_P_IP): | |
1679 | return br_multicast_ipv4_rcv(br, port, skb); | |
dfd56b8b | 1680 | #if IS_ENABLED(CONFIG_IPV6) |
08b202b6 YH |
1681 | case htons(ETH_P_IPV6): |
1682 | return br_multicast_ipv6_rcv(br, port, skb); | |
1683 | #endif | |
eb1d1641 HX |
1684 | } |
1685 | ||
1686 | return 0; | |
1687 | } | |
1688 | ||
cc0fdd80 LL |
1689 | static void br_multicast_query_expired(struct net_bridge *br, |
1690 | struct bridge_mcast_query *query) | |
1691 | { | |
1692 | spin_lock(&br->multicast_lock); | |
1693 | if (query->startup_sent < br->multicast_startup_query_count) | |
1694 | query->startup_sent++; | |
1695 | ||
1696 | br_multicast_send_query(br, NULL, query); | |
1697 | spin_unlock(&br->multicast_lock); | |
1698 | } | |
1699 | ||
1700 | static void br_ip4_multicast_query_expired(unsigned long data) | |
eb1d1641 HX |
1701 | { |
1702 | struct net_bridge *br = (void *)data; | |
1703 | ||
cc0fdd80 LL |
1704 | br_multicast_query_expired(br, &br->ip4_query); |
1705 | } | |
eb1d1641 | 1706 | |
cc0fdd80 LL |
1707 | #if IS_ENABLED(CONFIG_IPV6) |
1708 | static void br_ip6_multicast_query_expired(unsigned long data) | |
1709 | { | |
1710 | struct net_bridge *br = (void *)data; | |
eb1d1641 | 1711 | |
cc0fdd80 | 1712 | br_multicast_query_expired(br, &br->ip6_query); |
eb1d1641 | 1713 | } |
cc0fdd80 | 1714 | #endif |
eb1d1641 HX |
1715 | |
1716 | void br_multicast_init(struct net_bridge *br) | |
1717 | { | |
1718 | br->hash_elasticity = 4; | |
1719 | br->hash_max = 512; | |
1720 | ||
1721 | br->multicast_router = 1; | |
c5c23260 | 1722 | br->multicast_querier = 0; |
1c8ad5bf | 1723 | br->multicast_query_use_ifaddr = 0; |
eb1d1641 HX |
1724 | br->multicast_last_member_count = 2; |
1725 | br->multicast_startup_query_count = 2; | |
1726 | ||
1727 | br->multicast_last_member_interval = HZ; | |
1728 | br->multicast_query_response_interval = 10 * HZ; | |
1729 | br->multicast_startup_query_interval = 125 * HZ / 4; | |
1730 | br->multicast_query_interval = 125 * HZ; | |
1731 | br->multicast_querier_interval = 255 * HZ; | |
1732 | br->multicast_membership_interval = 260 * HZ; | |
1733 | ||
cc0fdd80 LL |
1734 | br->ip4_querier.delay_time = 0; |
1735 | #if IS_ENABLED(CONFIG_IPV6) | |
1736 | br->ip6_querier.delay_time = 0; | |
1737 | #endif | |
b00589af | 1738 | |
eb1d1641 HX |
1739 | spin_lock_init(&br->multicast_lock); |
1740 | setup_timer(&br->multicast_router_timer, | |
1741 | br_multicast_local_router_expired, 0); | |
cc0fdd80 LL |
1742 | setup_timer(&br->ip4_querier.timer, br_ip4_multicast_querier_expired, |
1743 | (unsigned long)br); | |
1744 | setup_timer(&br->ip4_query.timer, br_ip4_multicast_query_expired, | |
eb1d1641 | 1745 | (unsigned long)br); |
cc0fdd80 LL |
1746 | #if IS_ENABLED(CONFIG_IPV6) |
1747 | setup_timer(&br->ip6_querier.timer, br_ip6_multicast_querier_expired, | |
1748 | (unsigned long)br); | |
1749 | setup_timer(&br->ip6_query.timer, br_ip6_multicast_query_expired, | |
1750 | (unsigned long)br); | |
1751 | #endif | |
eb1d1641 HX |
1752 | } |
1753 | ||
cc0fdd80 LL |
1754 | static void __br_multicast_open(struct net_bridge *br, |
1755 | struct bridge_mcast_query *query) | |
eb1d1641 | 1756 | { |
cc0fdd80 | 1757 | query->startup_sent = 0; |
eb1d1641 HX |
1758 | |
1759 | if (br->multicast_disabled) | |
1760 | return; | |
1761 | ||
cc0fdd80 LL |
1762 | mod_timer(&query->timer, jiffies); |
1763 | } | |
1764 | ||
1765 | void br_multicast_open(struct net_bridge *br) | |
1766 | { | |
1767 | __br_multicast_open(br, &br->ip4_query); | |
1768 | #if IS_ENABLED(CONFIG_IPV6) | |
1769 | __br_multicast_open(br, &br->ip6_query); | |
1770 | #endif | |
eb1d1641 HX |
1771 | } |
1772 | ||
1773 | void br_multicast_stop(struct net_bridge *br) | |
1774 | { | |
1775 | struct net_bridge_mdb_htable *mdb; | |
1776 | struct net_bridge_mdb_entry *mp; | |
b67bfe0d | 1777 | struct hlist_node *n; |
eb1d1641 HX |
1778 | u32 ver; |
1779 | int i; | |
1780 | ||
1781 | del_timer_sync(&br->multicast_router_timer); | |
cc0fdd80 LL |
1782 | del_timer_sync(&br->ip4_querier.timer); |
1783 | del_timer_sync(&br->ip4_query.timer); | |
1784 | #if IS_ENABLED(CONFIG_IPV6) | |
1785 | del_timer_sync(&br->ip6_querier.timer); | |
1786 | del_timer_sync(&br->ip6_query.timer); | |
1787 | #endif | |
eb1d1641 HX |
1788 | |
1789 | spin_lock_bh(&br->multicast_lock); | |
e8051688 | 1790 | mdb = mlock_dereference(br->mdb, br); |
eb1d1641 HX |
1791 | if (!mdb) |
1792 | goto out; | |
1793 | ||
1794 | br->mdb = NULL; | |
1795 | ||
1796 | ver = mdb->ver; | |
1797 | for (i = 0; i < mdb->max; i++) { | |
b67bfe0d | 1798 | hlist_for_each_entry_safe(mp, n, &mdb->mhash[i], |
eb1d1641 HX |
1799 | hlist[ver]) { |
1800 | del_timer(&mp->timer); | |
9f00b2e7 | 1801 | mp->timer_armed = false; |
eb1d1641 HX |
1802 | call_rcu_bh(&mp->rcu, br_multicast_free_group); |
1803 | } | |
1804 | } | |
1805 | ||
1806 | if (mdb->old) { | |
1807 | spin_unlock_bh(&br->multicast_lock); | |
10cc2b50 | 1808 | rcu_barrier_bh(); |
eb1d1641 HX |
1809 | spin_lock_bh(&br->multicast_lock); |
1810 | WARN_ON(mdb->old); | |
1811 | } | |
1812 | ||
1813 | mdb->old = mdb; | |
1814 | call_rcu_bh(&mdb->rcu, br_mdb_free); | |
1815 | ||
1816 | out: | |
1817 | spin_unlock_bh(&br->multicast_lock); | |
1818 | } | |
0909e117 HX |
1819 | |
1820 | int br_multicast_set_router(struct net_bridge *br, unsigned long val) | |
1821 | { | |
1822 | int err = -ENOENT; | |
1823 | ||
1824 | spin_lock_bh(&br->multicast_lock); | |
1825 | if (!netif_running(br->dev)) | |
1826 | goto unlock; | |
1827 | ||
1828 | switch (val) { | |
1829 | case 0: | |
1830 | case 2: | |
1831 | del_timer(&br->multicast_router_timer); | |
1832 | /* fall through */ | |
1833 | case 1: | |
1834 | br->multicast_router = val; | |
1835 | err = 0; | |
1836 | break; | |
1837 | ||
1838 | default: | |
1839 | err = -EINVAL; | |
1840 | break; | |
1841 | } | |
1842 | ||
1843 | unlock: | |
1844 | spin_unlock_bh(&br->multicast_lock); | |
1845 | ||
1846 | return err; | |
1847 | } | |
1848 | ||
1849 | int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) | |
1850 | { | |
1851 | struct net_bridge *br = p->br; | |
1852 | int err = -ENOENT; | |
1853 | ||
1854 | spin_lock(&br->multicast_lock); | |
1855 | if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED) | |
1856 | goto unlock; | |
1857 | ||
1858 | switch (val) { | |
1859 | case 0: | |
1860 | case 1: | |
1861 | case 2: | |
1862 | p->multicast_router = val; | |
1863 | err = 0; | |
1864 | ||
1865 | if (val < 2 && !hlist_unhashed(&p->rlist)) | |
1866 | hlist_del_init_rcu(&p->rlist); | |
1867 | ||
1868 | if (val == 1) | |
1869 | break; | |
1870 | ||
1871 | del_timer(&p->multicast_router_timer); | |
1872 | ||
1873 | if (val == 0) | |
1874 | break; | |
1875 | ||
1876 | br_multicast_add_router(br, p); | |
1877 | break; | |
1878 | ||
1879 | default: | |
1880 | err = -EINVAL; | |
1881 | break; | |
1882 | } | |
1883 | ||
1884 | unlock: | |
1885 | spin_unlock(&br->multicast_lock); | |
1886 | ||
1887 | return err; | |
1888 | } | |
561f1103 | 1889 | |
cc0fdd80 LL |
1890 | static void br_multicast_start_querier(struct net_bridge *br, |
1891 | struct bridge_mcast_query *query) | |
561f1103 HX |
1892 | { |
1893 | struct net_bridge_port *port; | |
74857216 | 1894 | |
cc0fdd80 | 1895 | __br_multicast_open(br, query); |
74857216 HX |
1896 | |
1897 | list_for_each_entry(port, &br->port_list, list) { | |
1898 | if (port->state == BR_STATE_DISABLED || | |
1899 | port->state == BR_STATE_BLOCKING) | |
1900 | continue; | |
1901 | ||
cc0fdd80 LL |
1902 | if (query == &br->ip4_query) |
1903 | br_multicast_enable(&port->ip4_query); | |
1904 | #if IS_ENABLED(CONFIG_IPV6) | |
1905 | else | |
1906 | br_multicast_enable(&port->ip6_query); | |
1907 | #endif | |
74857216 HX |
1908 | } |
1909 | } | |
1910 | ||
1911 | int br_multicast_toggle(struct net_bridge *br, unsigned long val) | |
1912 | { | |
3a7fda06 | 1913 | int err = 0; |
e8051688 | 1914 | struct net_bridge_mdb_htable *mdb; |
561f1103 | 1915 | |
ef5e0d82 | 1916 | spin_lock_bh(&br->multicast_lock); |
561f1103 HX |
1917 | if (br->multicast_disabled == !val) |
1918 | goto unlock; | |
1919 | ||
1920 | br->multicast_disabled = !val; | |
1921 | if (br->multicast_disabled) | |
1922 | goto unlock; | |
1923 | ||
3a7fda06 HX |
1924 | if (!netif_running(br->dev)) |
1925 | goto unlock; | |
1926 | ||
e8051688 ED |
1927 | mdb = mlock_dereference(br->mdb, br); |
1928 | if (mdb) { | |
1929 | if (mdb->old) { | |
561f1103 HX |
1930 | err = -EEXIST; |
1931 | rollback: | |
1932 | br->multicast_disabled = !!val; | |
1933 | goto unlock; | |
1934 | } | |
1935 | ||
e8051688 | 1936 | err = br_mdb_rehash(&br->mdb, mdb->max, |
561f1103 HX |
1937 | br->hash_elasticity); |
1938 | if (err) | |
1939 | goto rollback; | |
1940 | } | |
1941 | ||
cc0fdd80 LL |
1942 | br_multicast_start_querier(br, &br->ip4_query); |
1943 | #if IS_ENABLED(CONFIG_IPV6) | |
1944 | br_multicast_start_querier(br, &br->ip6_query); | |
1945 | #endif | |
561f1103 HX |
1946 | |
1947 | unlock: | |
ef5e0d82 | 1948 | spin_unlock_bh(&br->multicast_lock); |
561f1103 HX |
1949 | |
1950 | return err; | |
1951 | } | |
b195167f | 1952 | |
c5c23260 HX |
1953 | int br_multicast_set_querier(struct net_bridge *br, unsigned long val) |
1954 | { | |
b00589af LL |
1955 | unsigned long max_delay; |
1956 | ||
c5c23260 HX |
1957 | val = !!val; |
1958 | ||
1959 | spin_lock_bh(&br->multicast_lock); | |
1960 | if (br->multicast_querier == val) | |
1961 | goto unlock; | |
1962 | ||
1963 | br->multicast_querier = val; | |
b00589af LL |
1964 | if (!val) |
1965 | goto unlock; | |
1966 | ||
1967 | max_delay = br->multicast_query_response_interval; | |
b00589af | 1968 | |
cc0fdd80 LL |
1969 | if (!timer_pending(&br->ip4_querier.timer)) |
1970 | br->ip4_querier.delay_time = jiffies + max_delay; | |
1971 | ||
1972 | br_multicast_start_querier(br, &br->ip4_query); | |
1973 | ||
1974 | #if IS_ENABLED(CONFIG_IPV6) | |
1975 | if (!timer_pending(&br->ip6_querier.timer)) | |
1976 | br->ip6_querier.delay_time = jiffies + max_delay; | |
1977 | ||
1978 | br_multicast_start_querier(br, &br->ip6_query); | |
1979 | #endif | |
c5c23260 HX |
1980 | |
1981 | unlock: | |
1982 | spin_unlock_bh(&br->multicast_lock); | |
1983 | ||
1984 | return 0; | |
1985 | } | |
1986 | ||
b195167f HX |
1987 | int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) |
1988 | { | |
1989 | int err = -ENOENT; | |
1990 | u32 old; | |
e8051688 | 1991 | struct net_bridge_mdb_htable *mdb; |
b195167f HX |
1992 | |
1993 | spin_lock(&br->multicast_lock); | |
1994 | if (!netif_running(br->dev)) | |
1995 | goto unlock; | |
1996 | ||
1997 | err = -EINVAL; | |
1998 | if (!is_power_of_2(val)) | |
1999 | goto unlock; | |
e8051688 ED |
2000 | |
2001 | mdb = mlock_dereference(br->mdb, br); | |
2002 | if (mdb && val < mdb->size) | |
b195167f HX |
2003 | goto unlock; |
2004 | ||
2005 | err = 0; | |
2006 | ||
2007 | old = br->hash_max; | |
2008 | br->hash_max = val; | |
2009 | ||
e8051688 ED |
2010 | if (mdb) { |
2011 | if (mdb->old) { | |
b195167f HX |
2012 | err = -EEXIST; |
2013 | rollback: | |
2014 | br->hash_max = old; | |
2015 | goto unlock; | |
2016 | } | |
2017 | ||
2018 | err = br_mdb_rehash(&br->mdb, br->hash_max, | |
2019 | br->hash_elasticity); | |
2020 | if (err) | |
2021 | goto rollback; | |
2022 | } | |
2023 | ||
2024 | unlock: | |
2025 | spin_unlock(&br->multicast_lock); | |
2026 | ||
2027 | return err; | |
2028 | } |