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Commit | Line | Data |
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ee07c6e7 CW |
1 | #include <linux/err.h> |
2 | #include <linux/igmp.h> | |
3 | #include <linux/kernel.h> | |
4 | #include <linux/netdevice.h> | |
5 | #include <linux/rculist.h> | |
6 | #include <linux/skbuff.h> | |
cfd56754 | 7 | #include <linux/if_ether.h> |
ee07c6e7 CW |
8 | #include <net/ip.h> |
9 | #include <net/netlink.h> | |
10 | #if IS_ENABLED(CONFIG_IPV6) | |
11 | #include <net/ipv6.h> | |
3c3769e6 | 12 | #include <net/addrconf.h> |
ee07c6e7 CW |
13 | #endif |
14 | ||
15 | #include "br_private.h" | |
16 | ||
17 | static int br_rports_fill_info(struct sk_buff *skb, struct netlink_callback *cb, | |
18 | struct net_device *dev) | |
19 | { | |
20 | struct net_bridge *br = netdev_priv(dev); | |
21 | struct net_bridge_port *p; | |
ee07c6e7 CW |
22 | struct nlattr *nest; |
23 | ||
24 | if (!br->multicast_router || hlist_empty(&br->router_list)) | |
25 | return 0; | |
26 | ||
27 | nest = nla_nest_start(skb, MDBA_ROUTER); | |
28 | if (nest == NULL) | |
29 | return -EMSGSIZE; | |
30 | ||
b67bfe0d | 31 | hlist_for_each_entry_rcu(p, &br->router_list, rlist) { |
ee07c6e7 CW |
32 | if (p && nla_put_u32(skb, MDBA_ROUTER_PORT, p->dev->ifindex)) |
33 | goto fail; | |
34 | } | |
35 | ||
36 | nla_nest_end(skb, nest); | |
37 | return 0; | |
38 | fail: | |
39 | nla_nest_cancel(skb, nest); | |
40 | return -EMSGSIZE; | |
41 | } | |
42 | ||
43 | static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb, | |
44 | struct net_device *dev) | |
45 | { | |
46 | struct net_bridge *br = netdev_priv(dev); | |
47 | struct net_bridge_mdb_htable *mdb; | |
48 | struct nlattr *nest, *nest2; | |
49 | int i, err = 0; | |
50 | int idx = 0, s_idx = cb->args[1]; | |
51 | ||
52 | if (br->multicast_disabled) | |
53 | return 0; | |
54 | ||
55 | mdb = rcu_dereference(br->mdb); | |
56 | if (!mdb) | |
57 | return 0; | |
58 | ||
59 | nest = nla_nest_start(skb, MDBA_MDB); | |
60 | if (nest == NULL) | |
61 | return -EMSGSIZE; | |
62 | ||
63 | for (i = 0; i < mdb->max; i++) { | |
ee07c6e7 | 64 | struct net_bridge_mdb_entry *mp; |
762a3d89 | 65 | struct net_bridge_port_group *p; |
66 | struct net_bridge_port_group __rcu **pp; | |
ee07c6e7 CW |
67 | struct net_bridge_port *port; |
68 | ||
b67bfe0d | 69 | hlist_for_each_entry_rcu(mp, &mdb->mhash[i], hlist[mdb->ver]) { |
ee07c6e7 CW |
70 | if (idx < s_idx) |
71 | goto skip; | |
72 | ||
73 | nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY); | |
74 | if (nest2 == NULL) { | |
75 | err = -EMSGSIZE; | |
76 | goto out; | |
77 | } | |
78 | ||
79 | for (pp = &mp->ports; | |
80 | (p = rcu_dereference(*pp)) != NULL; | |
81 | pp = &p->next) { | |
82 | port = p->port; | |
83 | if (port) { | |
84 | struct br_mdb_entry e; | |
c085c499 | 85 | memset(&e, 0, sizeof(e)); |
ee07c6e7 | 86 | e.ifindex = port->dev->ifindex; |
ccb1c31a | 87 | e.state = p->state; |
09d7cf7d VY |
88 | if (p->addr.proto == htons(ETH_P_IP)) |
89 | e.addr.u.ip4 = p->addr.u.ip4; | |
ee07c6e7 | 90 | #if IS_ENABLED(CONFIG_IPV6) |
09d7cf7d VY |
91 | if (p->addr.proto == htons(ETH_P_IPV6)) |
92 | e.addr.u.ip6 = p->addr.u.ip6; | |
ee07c6e7 CW |
93 | #endif |
94 | e.addr.proto = p->addr.proto; | |
95 | if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(e), &e)) { | |
96 | nla_nest_cancel(skb, nest2); | |
97 | err = -EMSGSIZE; | |
98 | goto out; | |
99 | } | |
100 | } | |
101 | } | |
102 | nla_nest_end(skb, nest2); | |
103 | skip: | |
104 | idx++; | |
105 | } | |
106 | } | |
107 | ||
108 | out: | |
109 | cb->args[1] = idx; | |
110 | nla_nest_end(skb, nest); | |
111 | return err; | |
112 | } | |
113 | ||
114 | static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
115 | { | |
116 | struct net_device *dev; | |
117 | struct net *net = sock_net(skb->sk); | |
118 | struct nlmsghdr *nlh = NULL; | |
119 | int idx = 0, s_idx; | |
120 | ||
121 | s_idx = cb->args[0]; | |
122 | ||
123 | rcu_read_lock(); | |
124 | ||
2ce297fc CW |
125 | /* In theory this could be wrapped to 0... */ |
126 | cb->seq = net->dev_base_seq + br_mdb_rehash_seq; | |
ee07c6e7 CW |
127 | |
128 | for_each_netdev_rcu(net, dev) { | |
129 | if (dev->priv_flags & IFF_EBRIDGE) { | |
130 | struct br_port_msg *bpm; | |
131 | ||
132 | if (idx < s_idx) | |
133 | goto skip; | |
134 | ||
135 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, | |
136 | cb->nlh->nlmsg_seq, RTM_GETMDB, | |
137 | sizeof(*bpm), NLM_F_MULTI); | |
138 | if (nlh == NULL) | |
139 | break; | |
140 | ||
141 | bpm = nlmsg_data(nlh); | |
c085c499 | 142 | memset(bpm, 0, sizeof(*bpm)); |
ee07c6e7 CW |
143 | bpm->ifindex = dev->ifindex; |
144 | if (br_mdb_fill_info(skb, cb, dev) < 0) | |
145 | goto out; | |
146 | if (br_rports_fill_info(skb, cb, dev) < 0) | |
147 | goto out; | |
148 | ||
149 | cb->args[1] = 0; | |
150 | nlmsg_end(skb, nlh); | |
151 | skip: | |
152 | idx++; | |
153 | } | |
154 | } | |
155 | ||
156 | out: | |
157 | if (nlh) | |
158 | nlmsg_end(skb, nlh); | |
159 | rcu_read_unlock(); | |
160 | cb->args[0] = idx; | |
161 | return skb->len; | |
162 | } | |
163 | ||
37a393bc CW |
164 | static int nlmsg_populate_mdb_fill(struct sk_buff *skb, |
165 | struct net_device *dev, | |
166 | struct br_mdb_entry *entry, u32 pid, | |
167 | u32 seq, int type, unsigned int flags) | |
168 | { | |
169 | struct nlmsghdr *nlh; | |
170 | struct br_port_msg *bpm; | |
171 | struct nlattr *nest, *nest2; | |
172 | ||
173 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI); | |
174 | if (!nlh) | |
175 | return -EMSGSIZE; | |
176 | ||
177 | bpm = nlmsg_data(nlh); | |
c085c499 | 178 | memset(bpm, 0, sizeof(*bpm)); |
37a393bc CW |
179 | bpm->family = AF_BRIDGE; |
180 | bpm->ifindex = dev->ifindex; | |
181 | nest = nla_nest_start(skb, MDBA_MDB); | |
182 | if (nest == NULL) | |
183 | goto cancel; | |
184 | nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY); | |
185 | if (nest2 == NULL) | |
186 | goto end; | |
187 | ||
188 | if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry)) | |
189 | goto end; | |
190 | ||
191 | nla_nest_end(skb, nest2); | |
192 | nla_nest_end(skb, nest); | |
193 | return nlmsg_end(skb, nlh); | |
194 | ||
195 | end: | |
196 | nla_nest_end(skb, nest); | |
197 | cancel: | |
198 | nlmsg_cancel(skb, nlh); | |
199 | return -EMSGSIZE; | |
200 | } | |
201 | ||
202 | static inline size_t rtnl_mdb_nlmsg_size(void) | |
203 | { | |
204 | return NLMSG_ALIGN(sizeof(struct br_port_msg)) | |
205 | + nla_total_size(sizeof(struct br_mdb_entry)); | |
206 | } | |
207 | ||
208 | static void __br_mdb_notify(struct net_device *dev, struct br_mdb_entry *entry, | |
209 | int type) | |
210 | { | |
211 | struct net *net = dev_net(dev); | |
212 | struct sk_buff *skb; | |
213 | int err = -ENOBUFS; | |
214 | ||
215 | skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC); | |
216 | if (!skb) | |
217 | goto errout; | |
218 | ||
219 | err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF); | |
220 | if (err < 0) { | |
221 | kfree_skb(skb); | |
222 | goto errout; | |
223 | } | |
224 | ||
225 | rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC); | |
226 | return; | |
227 | errout: | |
228 | rtnl_set_sk_err(net, RTNLGRP_MDB, err); | |
229 | } | |
230 | ||
231 | void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, | |
232 | struct br_ip *group, int type) | |
233 | { | |
234 | struct br_mdb_entry entry; | |
235 | ||
c085c499 | 236 | memset(&entry, 0, sizeof(entry)); |
37a393bc CW |
237 | entry.ifindex = port->dev->ifindex; |
238 | entry.addr.proto = group->proto; | |
239 | entry.addr.u.ip4 = group->u.ip4; | |
240 | #if IS_ENABLED(CONFIG_IPV6) | |
241 | entry.addr.u.ip6 = group->u.ip6; | |
242 | #endif | |
243 | __br_mdb_notify(dev, &entry, type); | |
244 | } | |
245 | ||
cfd56754 CW |
246 | static bool is_valid_mdb_entry(struct br_mdb_entry *entry) |
247 | { | |
248 | if (entry->ifindex == 0) | |
249 | return false; | |
250 | ||
251 | if (entry->addr.proto == htons(ETH_P_IP)) { | |
252 | if (!ipv4_is_multicast(entry->addr.u.ip4)) | |
253 | return false; | |
254 | if (ipv4_is_local_multicast(entry->addr.u.ip4)) | |
255 | return false; | |
256 | #if IS_ENABLED(CONFIG_IPV6) | |
257 | } else if (entry->addr.proto == htons(ETH_P_IPV6)) { | |
3c3769e6 | 258 | if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6)) |
cfd56754 CW |
259 | return false; |
260 | #endif | |
261 | } else | |
262 | return false; | |
ccb1c31a AW |
263 | if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY) |
264 | return false; | |
cfd56754 CW |
265 | |
266 | return true; | |
267 | } | |
268 | ||
269 | static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh, | |
270 | struct net_device **pdev, struct br_mdb_entry **pentry) | |
271 | { | |
272 | struct net *net = sock_net(skb->sk); | |
273 | struct br_mdb_entry *entry; | |
274 | struct br_port_msg *bpm; | |
275 | struct nlattr *tb[MDBA_SET_ENTRY_MAX+1]; | |
276 | struct net_device *dev; | |
277 | int err; | |
278 | ||
cfd56754 CW |
279 | err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY, NULL); |
280 | if (err < 0) | |
281 | return err; | |
282 | ||
283 | bpm = nlmsg_data(nlh); | |
284 | if (bpm->ifindex == 0) { | |
285 | pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n"); | |
286 | return -EINVAL; | |
287 | } | |
288 | ||
289 | dev = __dev_get_by_index(net, bpm->ifindex); | |
290 | if (dev == NULL) { | |
291 | pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n"); | |
292 | return -ENODEV; | |
293 | } | |
294 | ||
295 | if (!(dev->priv_flags & IFF_EBRIDGE)) { | |
296 | pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n"); | |
297 | return -EOPNOTSUPP; | |
298 | } | |
299 | ||
300 | *pdev = dev; | |
301 | ||
302 | if (!tb[MDBA_SET_ENTRY] || | |
303 | nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) { | |
304 | pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n"); | |
305 | return -EINVAL; | |
306 | } | |
307 | ||
308 | entry = nla_data(tb[MDBA_SET_ENTRY]); | |
309 | if (!is_valid_mdb_entry(entry)) { | |
310 | pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n"); | |
311 | return -EINVAL; | |
312 | } | |
313 | ||
314 | *pentry = entry; | |
315 | return 0; | |
316 | } | |
317 | ||
318 | static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port, | |
ccb1c31a | 319 | struct br_ip *group, unsigned char state) |
cfd56754 CW |
320 | { |
321 | struct net_bridge_mdb_entry *mp; | |
322 | struct net_bridge_port_group *p; | |
323 | struct net_bridge_port_group __rcu **pp; | |
324 | struct net_bridge_mdb_htable *mdb; | |
325 | int err; | |
326 | ||
327 | mdb = mlock_dereference(br->mdb, br); | |
328 | mp = br_mdb_ip_get(mdb, group); | |
329 | if (!mp) { | |
330 | mp = br_multicast_new_group(br, port, group); | |
331 | err = PTR_ERR(mp); | |
332 | if (IS_ERR(mp)) | |
333 | return err; | |
334 | } | |
335 | ||
336 | for (pp = &mp->ports; | |
337 | (p = mlock_dereference(*pp, br)) != NULL; | |
338 | pp = &p->next) { | |
339 | if (p->port == port) | |
340 | return -EEXIST; | |
341 | if ((unsigned long)p->port < (unsigned long)port) | |
342 | break; | |
343 | } | |
344 | ||
ccb1c31a | 345 | p = br_multicast_new_port_group(port, group, *pp, state); |
cfd56754 CW |
346 | if (unlikely(!p)) |
347 | return -ENOMEM; | |
348 | rcu_assign_pointer(*pp, p); | |
349 | ||
350 | br_mdb_notify(br->dev, port, group, RTM_NEWMDB); | |
351 | return 0; | |
352 | } | |
353 | ||
354 | static int __br_mdb_add(struct net *net, struct net_bridge *br, | |
355 | struct br_mdb_entry *entry) | |
356 | { | |
357 | struct br_ip ip; | |
358 | struct net_device *dev; | |
359 | struct net_bridge_port *p; | |
360 | int ret; | |
361 | ||
362 | if (!netif_running(br->dev) || br->multicast_disabled) | |
363 | return -EINVAL; | |
364 | ||
365 | dev = __dev_get_by_index(net, entry->ifindex); | |
366 | if (!dev) | |
367 | return -ENODEV; | |
368 | ||
369 | p = br_port_get_rtnl(dev); | |
370 | if (!p || p->br != br || p->state == BR_STATE_DISABLED) | |
371 | return -EINVAL; | |
372 | ||
373 | ip.proto = entry->addr.proto; | |
374 | if (ip.proto == htons(ETH_P_IP)) | |
375 | ip.u.ip4 = entry->addr.u.ip4; | |
376 | #if IS_ENABLED(CONFIG_IPV6) | |
377 | else | |
378 | ip.u.ip6 = entry->addr.u.ip6; | |
379 | #endif | |
380 | ||
381 | spin_lock_bh(&br->multicast_lock); | |
ccb1c31a | 382 | ret = br_mdb_add_group(br, p, &ip, entry->state); |
cfd56754 CW |
383 | spin_unlock_bh(&br->multicast_lock); |
384 | return ret; | |
385 | } | |
386 | ||
661d2967 | 387 | static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh) |
cfd56754 CW |
388 | { |
389 | struct net *net = sock_net(skb->sk); | |
390 | struct br_mdb_entry *entry; | |
391 | struct net_device *dev; | |
392 | struct net_bridge *br; | |
393 | int err; | |
394 | ||
395 | err = br_mdb_parse(skb, nlh, &dev, &entry); | |
396 | if (err < 0) | |
397 | return err; | |
398 | ||
399 | br = netdev_priv(dev); | |
400 | ||
401 | err = __br_mdb_add(net, br, entry); | |
402 | if (!err) | |
403 | __br_mdb_notify(dev, entry, RTM_NEWMDB); | |
404 | return err; | |
405 | } | |
406 | ||
407 | static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry) | |
408 | { | |
409 | struct net_bridge_mdb_htable *mdb; | |
410 | struct net_bridge_mdb_entry *mp; | |
411 | struct net_bridge_port_group *p; | |
412 | struct net_bridge_port_group __rcu **pp; | |
413 | struct br_ip ip; | |
414 | int err = -EINVAL; | |
415 | ||
416 | if (!netif_running(br->dev) || br->multicast_disabled) | |
417 | return -EINVAL; | |
418 | ||
cfd56754 | 419 | ip.proto = entry->addr.proto; |
cc0fdd80 | 420 | if (ip.proto == htons(ETH_P_IP)) { |
90010b36 | 421 | if (timer_pending(&br->ip4_other_query.timer)) |
cc0fdd80 LL |
422 | return -EBUSY; |
423 | ||
cfd56754 CW |
424 | ip.u.ip4 = entry->addr.u.ip4; |
425 | #if IS_ENABLED(CONFIG_IPV6) | |
cc0fdd80 | 426 | } else { |
90010b36 | 427 | if (timer_pending(&br->ip6_other_query.timer)) |
cc0fdd80 LL |
428 | return -EBUSY; |
429 | ||
cfd56754 CW |
430 | ip.u.ip6 = entry->addr.u.ip6; |
431 | #endif | |
cc0fdd80 | 432 | } |
cfd56754 CW |
433 | |
434 | spin_lock_bh(&br->multicast_lock); | |
435 | mdb = mlock_dereference(br->mdb, br); | |
436 | ||
437 | mp = br_mdb_ip_get(mdb, &ip); | |
438 | if (!mp) | |
439 | goto unlock; | |
440 | ||
441 | for (pp = &mp->ports; | |
442 | (p = mlock_dereference(*pp, br)) != NULL; | |
443 | pp = &p->next) { | |
444 | if (!p->port || p->port->dev->ifindex != entry->ifindex) | |
445 | continue; | |
446 | ||
447 | if (p->port->state == BR_STATE_DISABLED) | |
448 | goto unlock; | |
449 | ||
450 | rcu_assign_pointer(*pp, p->next); | |
451 | hlist_del_init(&p->mglist); | |
452 | del_timer(&p->timer); | |
453 | call_rcu_bh(&p->rcu, br_multicast_free_pg); | |
454 | err = 0; | |
455 | ||
454594f3 | 456 | if (!mp->ports && !mp->mglist && |
cfd56754 CW |
457 | netif_running(br->dev)) |
458 | mod_timer(&mp->timer, jiffies); | |
459 | break; | |
460 | } | |
461 | ||
462 | unlock: | |
463 | spin_unlock_bh(&br->multicast_lock); | |
464 | return err; | |
465 | } | |
466 | ||
661d2967 | 467 | static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh) |
cfd56754 CW |
468 | { |
469 | struct net_device *dev; | |
470 | struct br_mdb_entry *entry; | |
471 | struct net_bridge *br; | |
472 | int err; | |
473 | ||
474 | err = br_mdb_parse(skb, nlh, &dev, &entry); | |
475 | if (err < 0) | |
476 | return err; | |
477 | ||
478 | br = netdev_priv(dev); | |
479 | ||
480 | err = __br_mdb_del(br, entry); | |
481 | if (!err) | |
482 | __br_mdb_notify(dev, entry, RTM_DELMDB); | |
483 | return err; | |
484 | } | |
485 | ||
ee07c6e7 CW |
486 | void br_mdb_init(void) |
487 | { | |
488 | rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, NULL); | |
cfd56754 CW |
489 | rtnl_register(PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, NULL); |
490 | rtnl_register(PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, NULL); | |
ee07c6e7 | 491 | } |
63233159 VY |
492 | |
493 | void br_mdb_uninit(void) | |
494 | { | |
495 | rtnl_unregister(PF_BRIDGE, RTM_GETMDB); | |
496 | rtnl_unregister(PF_BRIDGE, RTM_NEWMDB); | |
497 | rtnl_unregister(PF_BRIDGE, RTM_DELMDB); | |
498 | } |