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Commit | Line | Data |
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e005d193 JP |
1 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
2 | ||
5f256bec EB |
3 | #include <linux/workqueue.h> |
4 | #include <linux/rtnetlink.h> | |
5 | #include <linux/cache.h> | |
6 | #include <linux/slab.h> | |
7 | #include <linux/list.h> | |
8 | #include <linux/delay.h> | |
9dd776b6 | 9 | #include <linux/sched.h> |
c93cf61f | 10 | #include <linux/idr.h> |
11a28d37 | 11 | #include <linux/rculist.h> |
30ffee84 | 12 | #include <linux/nsproxy.h> |
0bb80f24 DH |
13 | #include <linux/fs.h> |
14 | #include <linux/proc_ns.h> | |
f0630529 | 15 | #include <linux/file.h> |
bc3b2d7f | 16 | #include <linux/export.h> |
038e7332 | 17 | #include <linux/user_namespace.h> |
0c7aecd4 | 18 | #include <linux/net_namespace.h> |
0c7aecd4 ND |
19 | #include <net/sock.h> |
20 | #include <net/netlink.h> | |
5f256bec | 21 | #include <net/net_namespace.h> |
dec827d1 | 22 | #include <net/netns/generic.h> |
5f256bec EB |
23 | |
24 | /* | |
25 | * Our network namespace constructor/destructor lists | |
26 | */ | |
27 | ||
28 | static LIST_HEAD(pernet_list); | |
29 | static struct list_head *first_device = &pernet_list; | |
200b916f | 30 | DEFINE_MUTEX(net_mutex); |
95f38411 | 31 | static DEFINE_SPINLOCK(nsid_lock); |
5f256bec | 32 | |
5f256bec | 33 | LIST_HEAD(net_namespace_list); |
b76a461f | 34 | EXPORT_SYMBOL_GPL(net_namespace_list); |
5f256bec | 35 | |
734b6541 RM |
36 | struct net init_net = { |
37 | .dev_base_head = LIST_HEAD_INIT(init_net.dev_base_head), | |
38 | }; | |
ff4b9502 | 39 | EXPORT_SYMBOL(init_net); |
5f256bec | 40 | |
dec827d1 PE |
41 | #define INITIAL_NET_GEN_PTRS 13 /* +1 for len +2 for rcu_head */ |
42 | ||
073862ba ED |
43 | static unsigned int max_gen_ptrs = INITIAL_NET_GEN_PTRS; |
44 | ||
45 | static struct net_generic *net_alloc_generic(void) | |
46 | { | |
47 | struct net_generic *ng; | |
48 | size_t generic_size = offsetof(struct net_generic, ptr[max_gen_ptrs]); | |
49 | ||
50 | ng = kzalloc(generic_size, GFP_KERNEL); | |
51 | if (ng) | |
52 | ng->len = max_gen_ptrs; | |
53 | ||
54 | return ng; | |
55 | } | |
56 | ||
05fceb4a JP |
57 | static int net_assign_generic(struct net *net, int id, void *data) |
58 | { | |
59 | struct net_generic *ng, *old_ng; | |
60 | ||
61 | BUG_ON(!mutex_is_locked(&net_mutex)); | |
62 | BUG_ON(id == 0); | |
63 | ||
1c87733d ED |
64 | old_ng = rcu_dereference_protected(net->gen, |
65 | lockdep_is_held(&net_mutex)); | |
66 | ng = old_ng; | |
05fceb4a JP |
67 | if (old_ng->len >= id) |
68 | goto assign; | |
69 | ||
073862ba | 70 | ng = net_alloc_generic(); |
05fceb4a JP |
71 | if (ng == NULL) |
72 | return -ENOMEM; | |
73 | ||
74 | /* | |
75 | * Some synchronisation notes: | |
76 | * | |
77 | * The net_generic explores the net->gen array inside rcu | |
78 | * read section. Besides once set the net->gen->ptr[x] | |
79 | * pointer never changes (see rules in netns/generic.h). | |
80 | * | |
81 | * That said, we simply duplicate this array and schedule | |
82 | * the old copy for kfree after a grace period. | |
83 | */ | |
84 | ||
05fceb4a JP |
85 | memcpy(&ng->ptr, &old_ng->ptr, old_ng->len * sizeof(void*)); |
86 | ||
87 | rcu_assign_pointer(net->gen, ng); | |
04d4dfed | 88 | kfree_rcu(old_ng, rcu); |
05fceb4a JP |
89 | assign: |
90 | ng->ptr[id - 1] = data; | |
91 | return 0; | |
92 | } | |
93 | ||
f875bae0 EB |
94 | static int ops_init(const struct pernet_operations *ops, struct net *net) |
95 | { | |
b922934d JA |
96 | int err = -ENOMEM; |
97 | void *data = NULL; | |
98 | ||
f875bae0 | 99 | if (ops->id && ops->size) { |
b922934d | 100 | data = kzalloc(ops->size, GFP_KERNEL); |
f875bae0 | 101 | if (!data) |
b922934d | 102 | goto out; |
f875bae0 EB |
103 | |
104 | err = net_assign_generic(net, *ops->id, data); | |
b922934d JA |
105 | if (err) |
106 | goto cleanup; | |
f875bae0 | 107 | } |
b922934d | 108 | err = 0; |
f875bae0 | 109 | if (ops->init) |
b922934d JA |
110 | err = ops->init(net); |
111 | if (!err) | |
112 | return 0; | |
113 | ||
114 | cleanup: | |
115 | kfree(data); | |
116 | ||
117 | out: | |
118 | return err; | |
f875bae0 EB |
119 | } |
120 | ||
121 | static void ops_free(const struct pernet_operations *ops, struct net *net) | |
122 | { | |
123 | if (ops->id && ops->size) { | |
124 | int id = *ops->id; | |
125 | kfree(net_generic(net, id)); | |
126 | } | |
127 | } | |
128 | ||
72ad937a EB |
129 | static void ops_exit_list(const struct pernet_operations *ops, |
130 | struct list_head *net_exit_list) | |
131 | { | |
132 | struct net *net; | |
133 | if (ops->exit) { | |
134 | list_for_each_entry(net, net_exit_list, exit_list) | |
135 | ops->exit(net); | |
136 | } | |
72ad937a EB |
137 | if (ops->exit_batch) |
138 | ops->exit_batch(net_exit_list); | |
139 | } | |
140 | ||
141 | static void ops_free_list(const struct pernet_operations *ops, | |
142 | struct list_head *net_exit_list) | |
143 | { | |
144 | struct net *net; | |
145 | if (ops->size && ops->id) { | |
146 | list_for_each_entry(net, net_exit_list, exit_list) | |
147 | ops_free(ops, net); | |
148 | } | |
149 | } | |
150 | ||
95f38411 | 151 | /* should be called with nsid_lock held */ |
0c7aecd4 ND |
152 | static int alloc_netid(struct net *net, struct net *peer, int reqid) |
153 | { | |
3138dbf8 | 154 | int min = 0, max = 0; |
0c7aecd4 | 155 | |
0c7aecd4 ND |
156 | if (reqid >= 0) { |
157 | min = reqid; | |
158 | max = reqid + 1; | |
159 | } | |
160 | ||
95f38411 | 161 | return idr_alloc(&net->netns_ids, peer, min, max, GFP_ATOMIC); |
0c7aecd4 ND |
162 | } |
163 | ||
164 | /* This function is used by idr_for_each(). If net is equal to peer, the | |
165 | * function returns the id so that idr_for_each() stops. Because we cannot | |
166 | * returns the id 0 (idr_for_each() will not stop), we return the magic value | |
167 | * NET_ID_ZERO (-1) for it. | |
168 | */ | |
169 | #define NET_ID_ZERO -1 | |
170 | static int net_eq_idr(int id, void *net, void *peer) | |
171 | { | |
172 | if (net_eq(net, peer)) | |
173 | return id ? : NET_ID_ZERO; | |
174 | return 0; | |
175 | } | |
176 | ||
95f38411 ND |
177 | /* Should be called with nsid_lock held. If a new id is assigned, the bool alloc |
178 | * is set to true, thus the caller knows that the new id must be notified via | |
179 | * rtnl. | |
180 | */ | |
3138dbf8 | 181 | static int __peernet2id_alloc(struct net *net, struct net *peer, bool *alloc) |
0c7aecd4 ND |
182 | { |
183 | int id = idr_for_each(&net->netns_ids, net_eq_idr, peer); | |
3138dbf8 | 184 | bool alloc_it = *alloc; |
0c7aecd4 | 185 | |
3138dbf8 ND |
186 | *alloc = false; |
187 | ||
0c7aecd4 ND |
188 | /* Magic value for id 0. */ |
189 | if (id == NET_ID_ZERO) | |
190 | return 0; | |
191 | if (id > 0) | |
192 | return id; | |
193 | ||
3138dbf8 | 194 | if (alloc_it) { |
109582af | 195 | id = alloc_netid(net, peer, -1); |
3138dbf8 | 196 | *alloc = true; |
109582af ND |
197 | return id >= 0 ? id : NETNSA_NSID_NOT_ASSIGNED; |
198 | } | |
0c7aecd4 | 199 | |
109582af | 200 | return NETNSA_NSID_NOT_ASSIGNED; |
0c7aecd4 ND |
201 | } |
202 | ||
95f38411 | 203 | /* should be called with nsid_lock held */ |
3138dbf8 ND |
204 | static int __peernet2id(struct net *net, struct net *peer) |
205 | { | |
206 | bool no = false; | |
207 | ||
208 | return __peernet2id_alloc(net, peer, &no); | |
209 | } | |
210 | ||
211 | static void rtnl_net_notifyid(struct net *net, int cmd, int id); | |
0c7aecd4 ND |
212 | /* This function returns the id of a peer netns. If no id is assigned, one will |
213 | * be allocated and returned. | |
214 | */ | |
7a0877d4 | 215 | int peernet2id_alloc(struct net *net, struct net *peer) |
0c7aecd4 | 216 | { |
95f38411 ND |
217 | unsigned long flags; |
218 | bool alloc; | |
3138dbf8 | 219 | int id; |
0c7aecd4 | 220 | |
95f38411 ND |
221 | spin_lock_irqsave(&nsid_lock, flags); |
222 | alloc = atomic_read(&peer->count) == 0 ? false : true; | |
3138dbf8 | 223 | id = __peernet2id_alloc(net, peer, &alloc); |
95f38411 | 224 | spin_unlock_irqrestore(&nsid_lock, flags); |
3138dbf8 ND |
225 | if (alloc && id >= 0) |
226 | rtnl_net_notifyid(net, RTM_NEWNSID, id); | |
227 | return id; | |
0c7aecd4 | 228 | } |
7a0877d4 | 229 | EXPORT_SYMBOL(peernet2id_alloc); |
0c7aecd4 | 230 | |
95f38411 | 231 | /* This function returns, if assigned, the id of a peer netns. */ |
59324cf3 | 232 | int peernet2id(struct net *net, struct net *peer) |
95f38411 ND |
233 | { |
234 | unsigned long flags; | |
235 | int id; | |
236 | ||
237 | spin_lock_irqsave(&nsid_lock, flags); | |
238 | id = __peernet2id(net, peer); | |
239 | spin_unlock_irqrestore(&nsid_lock, flags); | |
240 | return id; | |
241 | } | |
242 | ||
59324cf3 ND |
243 | /* This function returns true is the peer netns has an id assigned into the |
244 | * current netns. | |
245 | */ | |
246 | bool peernet_has_id(struct net *net, struct net *peer) | |
247 | { | |
248 | return peernet2id(net, peer) >= 0; | |
249 | } | |
250 | ||
0c7aecd4 ND |
251 | struct net *get_net_ns_by_id(struct net *net, int id) |
252 | { | |
95f38411 | 253 | unsigned long flags; |
0c7aecd4 ND |
254 | struct net *peer; |
255 | ||
256 | if (id < 0) | |
257 | return NULL; | |
258 | ||
259 | rcu_read_lock(); | |
95f38411 | 260 | spin_lock_irqsave(&nsid_lock, flags); |
0c7aecd4 ND |
261 | peer = idr_find(&net->netns_ids, id); |
262 | if (peer) | |
263 | get_net(peer); | |
95f38411 | 264 | spin_unlock_irqrestore(&nsid_lock, flags); |
0c7aecd4 ND |
265 | rcu_read_unlock(); |
266 | ||
267 | return peer; | |
268 | } | |
269 | ||
5f256bec EB |
270 | /* |
271 | * setup_net runs the initializers for the network namespace object. | |
272 | */ | |
038e7332 | 273 | static __net_init int setup_net(struct net *net, struct user_namespace *user_ns) |
5f256bec EB |
274 | { |
275 | /* Must be called with net_mutex held */ | |
f875bae0 | 276 | const struct pernet_operations *ops, *saved_ops; |
486a87f1 | 277 | int error = 0; |
72ad937a | 278 | LIST_HEAD(net_exit_list); |
5f256bec | 279 | |
5f256bec | 280 | atomic_set(&net->count, 1); |
a685e089 | 281 | atomic_set(&net->passive, 1); |
4e985ada | 282 | net->dev_base_seq = 1; |
038e7332 | 283 | net->user_ns = user_ns; |
0c7aecd4 | 284 | idr_init(&net->netns_ids); |
486a87f1 | 285 | |
768f3591 | 286 | list_for_each_entry(ops, &pernet_list, list) { |
f875bae0 EB |
287 | error = ops_init(ops, net); |
288 | if (error < 0) | |
289 | goto out_undo; | |
5f256bec EB |
290 | } |
291 | out: | |
292 | return error; | |
768f3591 | 293 | |
5f256bec EB |
294 | out_undo: |
295 | /* Walk through the list backwards calling the exit functions | |
296 | * for the pernet modules whose init functions did not fail. | |
297 | */ | |
72ad937a | 298 | list_add(&net->exit_list, &net_exit_list); |
f875bae0 | 299 | saved_ops = ops; |
72ad937a EB |
300 | list_for_each_entry_continue_reverse(ops, &pernet_list, list) |
301 | ops_exit_list(ops, &net_exit_list); | |
302 | ||
f875bae0 EB |
303 | ops = saved_ops; |
304 | list_for_each_entry_continue_reverse(ops, &pernet_list, list) | |
72ad937a | 305 | ops_free_list(ops, &net_exit_list); |
310928d9 DL |
306 | |
307 | rcu_barrier(); | |
5f256bec EB |
308 | goto out; |
309 | } | |
310 | ||
6a1a3b9f | 311 | |
ebe47d47 CN |
312 | #ifdef CONFIG_NET_NS |
313 | static struct kmem_cache *net_cachep; | |
314 | static struct workqueue_struct *netns_wq; | |
315 | ||
486a87f1 | 316 | static struct net *net_alloc(void) |
45a19b0a | 317 | { |
486a87f1 DL |
318 | struct net *net = NULL; |
319 | struct net_generic *ng; | |
320 | ||
321 | ng = net_alloc_generic(); | |
322 | if (!ng) | |
323 | goto out; | |
324 | ||
325 | net = kmem_cache_zalloc(net_cachep, GFP_KERNEL); | |
45a19b0a | 326 | if (!net) |
486a87f1 | 327 | goto out_free; |
45a19b0a | 328 | |
486a87f1 DL |
329 | rcu_assign_pointer(net->gen, ng); |
330 | out: | |
331 | return net; | |
332 | ||
333 | out_free: | |
334 | kfree(ng); | |
335 | goto out; | |
336 | } | |
337 | ||
338 | static void net_free(struct net *net) | |
339 | { | |
416c51e1 | 340 | kfree(rcu_access_pointer(net->gen)); |
45a19b0a JFS |
341 | kmem_cache_free(net_cachep, net); |
342 | } | |
343 | ||
a685e089 AV |
344 | void net_drop_ns(void *p) |
345 | { | |
346 | struct net *ns = p; | |
347 | if (ns && atomic_dec_and_test(&ns->passive)) | |
348 | net_free(ns); | |
349 | } | |
350 | ||
038e7332 EB |
351 | struct net *copy_net_ns(unsigned long flags, |
352 | struct user_namespace *user_ns, struct net *old_net) | |
9dd776b6 | 353 | { |
088eb2d9 AD |
354 | struct net *net; |
355 | int rv; | |
9dd776b6 | 356 | |
911cb193 RL |
357 | if (!(flags & CLONE_NEWNET)) |
358 | return get_net(old_net); | |
359 | ||
088eb2d9 AD |
360 | net = net_alloc(); |
361 | if (!net) | |
362 | return ERR_PTR(-ENOMEM); | |
038e7332 EB |
363 | |
364 | get_user_ns(user_ns); | |
365 | ||
9dd776b6 | 366 | mutex_lock(&net_mutex); |
038e7332 | 367 | rv = setup_net(net, user_ns); |
088eb2d9 | 368 | if (rv == 0) { |
486a87f1 | 369 | rtnl_lock(); |
11a28d37 | 370 | list_add_tail_rcu(&net->list, &net_namespace_list); |
486a87f1 DL |
371 | rtnl_unlock(); |
372 | } | |
9dd776b6 | 373 | mutex_unlock(&net_mutex); |
088eb2d9 | 374 | if (rv < 0) { |
038e7332 | 375 | put_user_ns(user_ns); |
a685e089 | 376 | net_drop_ns(net); |
088eb2d9 AD |
377 | return ERR_PTR(rv); |
378 | } | |
379 | return net; | |
380 | } | |
486a87f1 | 381 | |
2b035b39 EB |
382 | static DEFINE_SPINLOCK(cleanup_list_lock); |
383 | static LIST_HEAD(cleanup_list); /* Must hold cleanup_list_lock to touch */ | |
384 | ||
6a1a3b9f PE |
385 | static void cleanup_net(struct work_struct *work) |
386 | { | |
f875bae0 | 387 | const struct pernet_operations *ops; |
6d458f5b | 388 | struct net *net, *tmp; |
1818ce4d | 389 | struct list_head net_kill_list; |
72ad937a | 390 | LIST_HEAD(net_exit_list); |
6a1a3b9f | 391 | |
2b035b39 EB |
392 | /* Atomically snapshot the list of namespaces to cleanup */ |
393 | spin_lock_irq(&cleanup_list_lock); | |
394 | list_replace_init(&cleanup_list, &net_kill_list); | |
395 | spin_unlock_irq(&cleanup_list_lock); | |
6a1a3b9f PE |
396 | |
397 | mutex_lock(&net_mutex); | |
398 | ||
399 | /* Don't let anyone else find us. */ | |
400 | rtnl_lock(); | |
72ad937a | 401 | list_for_each_entry(net, &net_kill_list, cleanup_list) { |
2b035b39 | 402 | list_del_rcu(&net->list); |
72ad937a | 403 | list_add_tail(&net->exit_list, &net_exit_list); |
6d458f5b | 404 | for_each_net(tmp) { |
95f38411 | 405 | int id; |
6d458f5b | 406 | |
95f38411 ND |
407 | spin_lock_irq(&nsid_lock); |
408 | id = __peernet2id(tmp, net); | |
409 | if (id >= 0) | |
6d458f5b | 410 | idr_remove(&tmp->netns_ids, id); |
95f38411 ND |
411 | spin_unlock_irq(&nsid_lock); |
412 | if (id >= 0) | |
413 | rtnl_net_notifyid(tmp, RTM_DELNSID, id); | |
6d458f5b | 414 | } |
95f38411 | 415 | spin_lock_irq(&nsid_lock); |
6d458f5b | 416 | idr_destroy(&net->netns_ids); |
95f38411 | 417 | spin_unlock_irq(&nsid_lock); |
6d458f5b | 418 | |
72ad937a | 419 | } |
6a1a3b9f PE |
420 | rtnl_unlock(); |
421 | ||
11a28d37 JB |
422 | /* |
423 | * Another CPU might be rcu-iterating the list, wait for it. | |
424 | * This needs to be before calling the exit() notifiers, so | |
425 | * the rcu_barrier() below isn't sufficient alone. | |
426 | */ | |
427 | synchronize_rcu(); | |
428 | ||
6a1a3b9f | 429 | /* Run all of the network namespace exit methods */ |
72ad937a EB |
430 | list_for_each_entry_reverse(ops, &pernet_list, list) |
431 | ops_exit_list(ops, &net_exit_list); | |
432 | ||
f875bae0 | 433 | /* Free the net generic variables */ |
72ad937a EB |
434 | list_for_each_entry_reverse(ops, &pernet_list, list) |
435 | ops_free_list(ops, &net_exit_list); | |
6a1a3b9f PE |
436 | |
437 | mutex_unlock(&net_mutex); | |
438 | ||
439 | /* Ensure there are no outstanding rcu callbacks using this | |
440 | * network namespace. | |
441 | */ | |
442 | rcu_barrier(); | |
443 | ||
444 | /* Finally it is safe to free my network namespace structure */ | |
72ad937a EB |
445 | list_for_each_entry_safe(net, tmp, &net_exit_list, exit_list) { |
446 | list_del_init(&net->exit_list); | |
038e7332 | 447 | put_user_ns(net->user_ns); |
a685e089 | 448 | net_drop_ns(net); |
2b035b39 | 449 | } |
6a1a3b9f | 450 | } |
2b035b39 | 451 | static DECLARE_WORK(net_cleanup_work, cleanup_net); |
6a1a3b9f PE |
452 | |
453 | void __put_net(struct net *net) | |
454 | { | |
455 | /* Cleanup the network namespace in process context */ | |
2b035b39 EB |
456 | unsigned long flags; |
457 | ||
458 | spin_lock_irqsave(&cleanup_list_lock, flags); | |
459 | list_add(&net->cleanup_list, &cleanup_list); | |
460 | spin_unlock_irqrestore(&cleanup_list_lock, flags); | |
461 | ||
462 | queue_work(netns_wq, &net_cleanup_work); | |
6a1a3b9f PE |
463 | } |
464 | EXPORT_SYMBOL_GPL(__put_net); | |
465 | ||
956c9207 SR |
466 | struct net *get_net_ns_by_fd(int fd) |
467 | { | |
956c9207 | 468 | struct file *file; |
33c42940 | 469 | struct ns_common *ns; |
956c9207 SR |
470 | struct net *net; |
471 | ||
956c9207 | 472 | file = proc_ns_fget(fd); |
c316e6a3 AV |
473 | if (IS_ERR(file)) |
474 | return ERR_CAST(file); | |
956c9207 | 475 | |
f77c8014 | 476 | ns = get_proc_ns(file_inode(file)); |
33c42940 AV |
477 | if (ns->ops == &netns_operations) |
478 | net = get_net(container_of(ns, struct net, ns)); | |
c316e6a3 AV |
479 | else |
480 | net = ERR_PTR(-EINVAL); | |
956c9207 | 481 | |
c316e6a3 | 482 | fput(file); |
956c9207 SR |
483 | return net; |
484 | } | |
485 | ||
6a1a3b9f | 486 | #else |
956c9207 SR |
487 | struct net *get_net_ns_by_fd(int fd) |
488 | { | |
489 | return ERR_PTR(-EINVAL); | |
490 | } | |
6a1a3b9f | 491 | #endif |
4b681c82 | 492 | EXPORT_SYMBOL_GPL(get_net_ns_by_fd); |
6a1a3b9f | 493 | |
30ffee84 JB |
494 | struct net *get_net_ns_by_pid(pid_t pid) |
495 | { | |
496 | struct task_struct *tsk; | |
497 | struct net *net; | |
498 | ||
499 | /* Lookup the network namespace */ | |
500 | net = ERR_PTR(-ESRCH); | |
501 | rcu_read_lock(); | |
502 | tsk = find_task_by_vpid(pid); | |
503 | if (tsk) { | |
504 | struct nsproxy *nsproxy; | |
728dba3a EB |
505 | task_lock(tsk); |
506 | nsproxy = tsk->nsproxy; | |
30ffee84 JB |
507 | if (nsproxy) |
508 | net = get_net(nsproxy->net_ns); | |
728dba3a | 509 | task_unlock(tsk); |
30ffee84 JB |
510 | } |
511 | rcu_read_unlock(); | |
512 | return net; | |
513 | } | |
514 | EXPORT_SYMBOL_GPL(get_net_ns_by_pid); | |
515 | ||
98f842e6 EB |
516 | static __net_init int net_ns_net_init(struct net *net) |
517 | { | |
33c42940 AV |
518 | #ifdef CONFIG_NET_NS |
519 | net->ns.ops = &netns_operations; | |
520 | #endif | |
6344c433 | 521 | return ns_alloc_inum(&net->ns); |
98f842e6 EB |
522 | } |
523 | ||
524 | static __net_exit void net_ns_net_exit(struct net *net) | |
525 | { | |
6344c433 | 526 | ns_free_inum(&net->ns); |
98f842e6 EB |
527 | } |
528 | ||
529 | static struct pernet_operations __net_initdata net_ns_ops = { | |
530 | .init = net_ns_net_init, | |
531 | .exit = net_ns_net_exit, | |
532 | }; | |
533 | ||
0c7aecd4 ND |
534 | static struct nla_policy rtnl_net_policy[NETNSA_MAX + 1] = { |
535 | [NETNSA_NONE] = { .type = NLA_UNSPEC }, | |
536 | [NETNSA_NSID] = { .type = NLA_S32 }, | |
537 | [NETNSA_PID] = { .type = NLA_U32 }, | |
538 | [NETNSA_FD] = { .type = NLA_U32 }, | |
539 | }; | |
540 | ||
541 | static int rtnl_net_newid(struct sk_buff *skb, struct nlmsghdr *nlh) | |
542 | { | |
543 | struct net *net = sock_net(skb->sk); | |
544 | struct nlattr *tb[NETNSA_MAX + 1]; | |
95f38411 | 545 | unsigned long flags; |
0c7aecd4 ND |
546 | struct net *peer; |
547 | int nsid, err; | |
548 | ||
549 | err = nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, NETNSA_MAX, | |
550 | rtnl_net_policy); | |
551 | if (err < 0) | |
552 | return err; | |
553 | if (!tb[NETNSA_NSID]) | |
554 | return -EINVAL; | |
555 | nsid = nla_get_s32(tb[NETNSA_NSID]); | |
556 | ||
557 | if (tb[NETNSA_PID]) | |
558 | peer = get_net_ns_by_pid(nla_get_u32(tb[NETNSA_PID])); | |
559 | else if (tb[NETNSA_FD]) | |
560 | peer = get_net_ns_by_fd(nla_get_u32(tb[NETNSA_FD])); | |
561 | else | |
562 | return -EINVAL; | |
563 | if (IS_ERR(peer)) | |
564 | return PTR_ERR(peer); | |
565 | ||
95f38411 | 566 | spin_lock_irqsave(&nsid_lock, flags); |
3138dbf8 | 567 | if (__peernet2id(net, peer) >= 0) { |
0c7aecd4 ND |
568 | err = -EEXIST; |
569 | goto out; | |
570 | } | |
571 | ||
572 | err = alloc_netid(net, peer, nsid); | |
95f38411 | 573 | spin_unlock_irqrestore(&nsid_lock, flags); |
3138dbf8 ND |
574 | if (err >= 0) { |
575 | rtnl_net_notifyid(net, RTM_NEWNSID, err); | |
0c7aecd4 | 576 | err = 0; |
3138dbf8 | 577 | } |
0c7aecd4 ND |
578 | out: |
579 | put_net(peer); | |
580 | return err; | |
581 | } | |
582 | ||
583 | static int rtnl_net_get_size(void) | |
584 | { | |
585 | return NLMSG_ALIGN(sizeof(struct rtgenmsg)) | |
586 | + nla_total_size(sizeof(s32)) /* NETNSA_NSID */ | |
587 | ; | |
588 | } | |
589 | ||
590 | static int rtnl_net_fill(struct sk_buff *skb, u32 portid, u32 seq, int flags, | |
cab3c8ec | 591 | int cmd, struct net *net, int nsid) |
0c7aecd4 ND |
592 | { |
593 | struct nlmsghdr *nlh; | |
594 | struct rtgenmsg *rth; | |
0c7aecd4 ND |
595 | |
596 | nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rth), flags); | |
597 | if (!nlh) | |
598 | return -EMSGSIZE; | |
599 | ||
600 | rth = nlmsg_data(nlh); | |
601 | rth->rtgen_family = AF_UNSPEC; | |
602 | ||
cab3c8ec | 603 | if (nla_put_s32(skb, NETNSA_NSID, nsid)) |
0c7aecd4 ND |
604 | goto nla_put_failure; |
605 | ||
606 | nlmsg_end(skb, nlh); | |
607 | return 0; | |
608 | ||
609 | nla_put_failure: | |
610 | nlmsg_cancel(skb, nlh); | |
611 | return -EMSGSIZE; | |
612 | } | |
613 | ||
614 | static int rtnl_net_getid(struct sk_buff *skb, struct nlmsghdr *nlh) | |
615 | { | |
616 | struct net *net = sock_net(skb->sk); | |
617 | struct nlattr *tb[NETNSA_MAX + 1]; | |
618 | struct sk_buff *msg; | |
0c7aecd4 | 619 | struct net *peer; |
cab3c8ec | 620 | int err, id; |
0c7aecd4 ND |
621 | |
622 | err = nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, NETNSA_MAX, | |
623 | rtnl_net_policy); | |
624 | if (err < 0) | |
625 | return err; | |
626 | if (tb[NETNSA_PID]) | |
627 | peer = get_net_ns_by_pid(nla_get_u32(tb[NETNSA_PID])); | |
628 | else if (tb[NETNSA_FD]) | |
629 | peer = get_net_ns_by_fd(nla_get_u32(tb[NETNSA_FD])); | |
630 | else | |
631 | return -EINVAL; | |
632 | ||
633 | if (IS_ERR(peer)) | |
634 | return PTR_ERR(peer); | |
635 | ||
636 | msg = nlmsg_new(rtnl_net_get_size(), GFP_KERNEL); | |
637 | if (!msg) { | |
638 | err = -ENOMEM; | |
639 | goto out; | |
640 | } | |
641 | ||
95f38411 | 642 | id = peernet2id(net, peer); |
0c7aecd4 | 643 | err = rtnl_net_fill(msg, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, |
cab3c8ec | 644 | RTM_GETNSID, net, id); |
0c7aecd4 ND |
645 | if (err < 0) |
646 | goto err_out; | |
647 | ||
648 | err = rtnl_unicast(msg, net, NETLINK_CB(skb).portid); | |
649 | goto out; | |
650 | ||
651 | err_out: | |
652 | nlmsg_free(msg); | |
653 | out: | |
654 | put_net(peer); | |
655 | return err; | |
656 | } | |
657 | ||
a143c40c ND |
658 | struct rtnl_net_dump_cb { |
659 | struct net *net; | |
660 | struct sk_buff *skb; | |
661 | struct netlink_callback *cb; | |
662 | int idx; | |
663 | int s_idx; | |
664 | }; | |
665 | ||
666 | static int rtnl_net_dumpid_one(int id, void *peer, void *data) | |
667 | { | |
668 | struct rtnl_net_dump_cb *net_cb = (struct rtnl_net_dump_cb *)data; | |
669 | int ret; | |
670 | ||
671 | if (net_cb->idx < net_cb->s_idx) | |
672 | goto cont; | |
673 | ||
674 | ret = rtnl_net_fill(net_cb->skb, NETLINK_CB(net_cb->cb->skb).portid, | |
675 | net_cb->cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
cab3c8ec | 676 | RTM_NEWNSID, net_cb->net, id); |
a143c40c ND |
677 | if (ret < 0) |
678 | return ret; | |
679 | ||
680 | cont: | |
681 | net_cb->idx++; | |
682 | return 0; | |
683 | } | |
684 | ||
685 | static int rtnl_net_dumpid(struct sk_buff *skb, struct netlink_callback *cb) | |
686 | { | |
687 | struct net *net = sock_net(skb->sk); | |
688 | struct rtnl_net_dump_cb net_cb = { | |
689 | .net = net, | |
690 | .skb = skb, | |
691 | .cb = cb, | |
692 | .idx = 0, | |
693 | .s_idx = cb->args[0], | |
694 | }; | |
95f38411 | 695 | unsigned long flags; |
a143c40c | 696 | |
95f38411 | 697 | spin_lock_irqsave(&nsid_lock, flags); |
a143c40c | 698 | idr_for_each(&net->netns_ids, rtnl_net_dumpid_one, &net_cb); |
95f38411 | 699 | spin_unlock_irqrestore(&nsid_lock, flags); |
a143c40c ND |
700 | |
701 | cb->args[0] = net_cb.idx; | |
702 | return skb->len; | |
703 | } | |
704 | ||
cab3c8ec | 705 | static void rtnl_net_notifyid(struct net *net, int cmd, int id) |
9a963454 ND |
706 | { |
707 | struct sk_buff *msg; | |
708 | int err = -ENOMEM; | |
709 | ||
710 | msg = nlmsg_new(rtnl_net_get_size(), GFP_KERNEL); | |
711 | if (!msg) | |
712 | goto out; | |
713 | ||
cab3c8ec | 714 | err = rtnl_net_fill(msg, 0, 0, 0, cmd, net, id); |
9a963454 ND |
715 | if (err < 0) |
716 | goto err_out; | |
717 | ||
718 | rtnl_notify(msg, net, 0, RTNLGRP_NSID, NULL, 0); | |
719 | return; | |
720 | ||
721 | err_out: | |
722 | nlmsg_free(msg); | |
723 | out: | |
724 | rtnl_set_sk_err(net, RTNLGRP_NSID, err); | |
725 | } | |
726 | ||
5f256bec EB |
727 | static int __init net_ns_init(void) |
728 | { | |
486a87f1 | 729 | struct net_generic *ng; |
5f256bec | 730 | |
d57a9212 | 731 | #ifdef CONFIG_NET_NS |
5f256bec EB |
732 | net_cachep = kmem_cache_create("net_namespace", sizeof(struct net), |
733 | SMP_CACHE_BYTES, | |
734 | SLAB_PANIC, NULL); | |
3ef1355d BT |
735 | |
736 | /* Create workqueue for cleanup */ | |
737 | netns_wq = create_singlethread_workqueue("netns"); | |
738 | if (!netns_wq) | |
739 | panic("Could not create netns workq"); | |
d57a9212 | 740 | #endif |
3ef1355d | 741 | |
486a87f1 DL |
742 | ng = net_alloc_generic(); |
743 | if (!ng) | |
744 | panic("Could not allocate generic netns"); | |
745 | ||
746 | rcu_assign_pointer(init_net.gen, ng); | |
747 | ||
5f256bec | 748 | mutex_lock(&net_mutex); |
038e7332 | 749 | if (setup_net(&init_net, &init_user_ns)) |
ca0f3112 | 750 | panic("Could not setup the initial network namespace"); |
5f256bec | 751 | |
f4618d39 | 752 | rtnl_lock(); |
11a28d37 | 753 | list_add_tail_rcu(&init_net.list, &net_namespace_list); |
f4618d39 | 754 | rtnl_unlock(); |
5f256bec EB |
755 | |
756 | mutex_unlock(&net_mutex); | |
5f256bec | 757 | |
98f842e6 EB |
758 | register_pernet_subsys(&net_ns_ops); |
759 | ||
0c7aecd4 | 760 | rtnl_register(PF_UNSPEC, RTM_NEWNSID, rtnl_net_newid, NULL, NULL); |
a143c40c ND |
761 | rtnl_register(PF_UNSPEC, RTM_GETNSID, rtnl_net_getid, rtnl_net_dumpid, |
762 | NULL); | |
0c7aecd4 | 763 | |
5f256bec EB |
764 | return 0; |
765 | } | |
766 | ||
767 | pure_initcall(net_ns_init); | |
768 | ||
ed160e83 | 769 | #ifdef CONFIG_NET_NS |
f875bae0 EB |
770 | static int __register_pernet_operations(struct list_head *list, |
771 | struct pernet_operations *ops) | |
5f256bec | 772 | { |
72ad937a | 773 | struct net *net; |
5f256bec | 774 | int error; |
72ad937a | 775 | LIST_HEAD(net_exit_list); |
5f256bec | 776 | |
5f256bec | 777 | list_add_tail(&ops->list, list); |
f875bae0 | 778 | if (ops->init || (ops->id && ops->size)) { |
1dba323b | 779 | for_each_net(net) { |
f875bae0 | 780 | error = ops_init(ops, net); |
5f256bec EB |
781 | if (error) |
782 | goto out_undo; | |
72ad937a | 783 | list_add_tail(&net->exit_list, &net_exit_list); |
5f256bec EB |
784 | } |
785 | } | |
1dba323b | 786 | return 0; |
5f256bec EB |
787 | |
788 | out_undo: | |
789 | /* If I have an error cleanup all namespaces I initialized */ | |
790 | list_del(&ops->list); | |
72ad937a EB |
791 | ops_exit_list(ops, &net_exit_list); |
792 | ops_free_list(ops, &net_exit_list); | |
1dba323b | 793 | return error; |
5f256bec EB |
794 | } |
795 | ||
f875bae0 | 796 | static void __unregister_pernet_operations(struct pernet_operations *ops) |
5f256bec EB |
797 | { |
798 | struct net *net; | |
72ad937a | 799 | LIST_HEAD(net_exit_list); |
5f256bec EB |
800 | |
801 | list_del(&ops->list); | |
72ad937a EB |
802 | for_each_net(net) |
803 | list_add_tail(&net->exit_list, &net_exit_list); | |
804 | ops_exit_list(ops, &net_exit_list); | |
805 | ops_free_list(ops, &net_exit_list); | |
5f256bec EB |
806 | } |
807 | ||
ed160e83 DL |
808 | #else |
809 | ||
f875bae0 EB |
810 | static int __register_pernet_operations(struct list_head *list, |
811 | struct pernet_operations *ops) | |
ed160e83 | 812 | { |
b922934d | 813 | return ops_init(ops, &init_net); |
ed160e83 DL |
814 | } |
815 | ||
f875bae0 | 816 | static void __unregister_pernet_operations(struct pernet_operations *ops) |
ed160e83 | 817 | { |
72ad937a EB |
818 | LIST_HEAD(net_exit_list); |
819 | list_add(&init_net.exit_list, &net_exit_list); | |
820 | ops_exit_list(ops, &net_exit_list); | |
821 | ops_free_list(ops, &net_exit_list); | |
ed160e83 | 822 | } |
f875bae0 EB |
823 | |
824 | #endif /* CONFIG_NET_NS */ | |
ed160e83 | 825 | |
c93cf61f PE |
826 | static DEFINE_IDA(net_generic_ids); |
827 | ||
f875bae0 EB |
828 | static int register_pernet_operations(struct list_head *list, |
829 | struct pernet_operations *ops) | |
830 | { | |
831 | int error; | |
832 | ||
833 | if (ops->id) { | |
834 | again: | |
835 | error = ida_get_new_above(&net_generic_ids, 1, ops->id); | |
836 | if (error < 0) { | |
837 | if (error == -EAGAIN) { | |
838 | ida_pre_get(&net_generic_ids, GFP_KERNEL); | |
839 | goto again; | |
840 | } | |
841 | return error; | |
842 | } | |
073862ba | 843 | max_gen_ptrs = max_t(unsigned int, max_gen_ptrs, *ops->id); |
f875bae0 EB |
844 | } |
845 | error = __register_pernet_operations(list, ops); | |
3a765eda EB |
846 | if (error) { |
847 | rcu_barrier(); | |
848 | if (ops->id) | |
849 | ida_remove(&net_generic_ids, *ops->id); | |
850 | } | |
f875bae0 EB |
851 | |
852 | return error; | |
853 | } | |
854 | ||
855 | static void unregister_pernet_operations(struct pernet_operations *ops) | |
856 | { | |
857 | ||
858 | __unregister_pernet_operations(ops); | |
3a765eda | 859 | rcu_barrier(); |
f875bae0 EB |
860 | if (ops->id) |
861 | ida_remove(&net_generic_ids, *ops->id); | |
862 | } | |
863 | ||
5f256bec EB |
864 | /** |
865 | * register_pernet_subsys - register a network namespace subsystem | |
866 | * @ops: pernet operations structure for the subsystem | |
867 | * | |
868 | * Register a subsystem which has init and exit functions | |
869 | * that are called when network namespaces are created and | |
870 | * destroyed respectively. | |
871 | * | |
872 | * When registered all network namespace init functions are | |
873 | * called for every existing network namespace. Allowing kernel | |
874 | * modules to have a race free view of the set of network namespaces. | |
875 | * | |
876 | * When a new network namespace is created all of the init | |
877 | * methods are called in the order in which they were registered. | |
878 | * | |
879 | * When a network namespace is destroyed all of the exit methods | |
880 | * are called in the reverse of the order with which they were | |
881 | * registered. | |
882 | */ | |
883 | int register_pernet_subsys(struct pernet_operations *ops) | |
884 | { | |
885 | int error; | |
886 | mutex_lock(&net_mutex); | |
887 | error = register_pernet_operations(first_device, ops); | |
888 | mutex_unlock(&net_mutex); | |
889 | return error; | |
890 | } | |
891 | EXPORT_SYMBOL_GPL(register_pernet_subsys); | |
892 | ||
893 | /** | |
894 | * unregister_pernet_subsys - unregister a network namespace subsystem | |
895 | * @ops: pernet operations structure to manipulate | |
896 | * | |
897 | * Remove the pernet operations structure from the list to be | |
53379e57 | 898 | * used when network namespaces are created or destroyed. In |
5f256bec EB |
899 | * addition run the exit method for all existing network |
900 | * namespaces. | |
901 | */ | |
b3c981d2 | 902 | void unregister_pernet_subsys(struct pernet_operations *ops) |
5f256bec EB |
903 | { |
904 | mutex_lock(&net_mutex); | |
b3c981d2 | 905 | unregister_pernet_operations(ops); |
5f256bec EB |
906 | mutex_unlock(&net_mutex); |
907 | } | |
908 | EXPORT_SYMBOL_GPL(unregister_pernet_subsys); | |
909 | ||
910 | /** | |
911 | * register_pernet_device - register a network namespace device | |
912 | * @ops: pernet operations structure for the subsystem | |
913 | * | |
914 | * Register a device which has init and exit functions | |
915 | * that are called when network namespaces are created and | |
916 | * destroyed respectively. | |
917 | * | |
918 | * When registered all network namespace init functions are | |
919 | * called for every existing network namespace. Allowing kernel | |
920 | * modules to have a race free view of the set of network namespaces. | |
921 | * | |
922 | * When a new network namespace is created all of the init | |
923 | * methods are called in the order in which they were registered. | |
924 | * | |
925 | * When a network namespace is destroyed all of the exit methods | |
926 | * are called in the reverse of the order with which they were | |
927 | * registered. | |
928 | */ | |
929 | int register_pernet_device(struct pernet_operations *ops) | |
930 | { | |
931 | int error; | |
932 | mutex_lock(&net_mutex); | |
933 | error = register_pernet_operations(&pernet_list, ops); | |
934 | if (!error && (first_device == &pernet_list)) | |
935 | first_device = &ops->list; | |
936 | mutex_unlock(&net_mutex); | |
937 | return error; | |
938 | } | |
939 | EXPORT_SYMBOL_GPL(register_pernet_device); | |
940 | ||
941 | /** | |
942 | * unregister_pernet_device - unregister a network namespace netdevice | |
943 | * @ops: pernet operations structure to manipulate | |
944 | * | |
945 | * Remove the pernet operations structure from the list to be | |
53379e57 | 946 | * used when network namespaces are created or destroyed. In |
5f256bec EB |
947 | * addition run the exit method for all existing network |
948 | * namespaces. | |
949 | */ | |
950 | void unregister_pernet_device(struct pernet_operations *ops) | |
951 | { | |
952 | mutex_lock(&net_mutex); | |
953 | if (&ops->list == first_device) | |
954 | first_device = first_device->next; | |
955 | unregister_pernet_operations(ops); | |
956 | mutex_unlock(&net_mutex); | |
957 | } | |
958 | EXPORT_SYMBOL_GPL(unregister_pernet_device); | |
13b6f576 EB |
959 | |
960 | #ifdef CONFIG_NET_NS | |
64964528 | 961 | static struct ns_common *netns_get(struct task_struct *task) |
13b6f576 | 962 | { |
f0630529 EB |
963 | struct net *net = NULL; |
964 | struct nsproxy *nsproxy; | |
965 | ||
728dba3a EB |
966 | task_lock(task); |
967 | nsproxy = task->nsproxy; | |
f0630529 EB |
968 | if (nsproxy) |
969 | net = get_net(nsproxy->net_ns); | |
728dba3a | 970 | task_unlock(task); |
f0630529 | 971 | |
ff24870f AV |
972 | return net ? &net->ns : NULL; |
973 | } | |
974 | ||
975 | static inline struct net *to_net_ns(struct ns_common *ns) | |
976 | { | |
977 | return container_of(ns, struct net, ns); | |
13b6f576 EB |
978 | } |
979 | ||
64964528 | 980 | static void netns_put(struct ns_common *ns) |
13b6f576 | 981 | { |
ff24870f | 982 | put_net(to_net_ns(ns)); |
13b6f576 EB |
983 | } |
984 | ||
64964528 | 985 | static int netns_install(struct nsproxy *nsproxy, struct ns_common *ns) |
13b6f576 | 986 | { |
ff24870f | 987 | struct net *net = to_net_ns(ns); |
142e1d1d | 988 | |
5e4a0847 | 989 | if (!ns_capable(net->user_ns, CAP_SYS_ADMIN) || |
c7b96acf | 990 | !ns_capable(current_user_ns(), CAP_SYS_ADMIN)) |
142e1d1d EB |
991 | return -EPERM; |
992 | ||
13b6f576 | 993 | put_net(nsproxy->net_ns); |
142e1d1d | 994 | nsproxy->net_ns = get_net(net); |
13b6f576 EB |
995 | return 0; |
996 | } | |
997 | ||
998 | const struct proc_ns_operations netns_operations = { | |
999 | .name = "net", | |
1000 | .type = CLONE_NEWNET, | |
1001 | .get = netns_get, | |
1002 | .put = netns_put, | |
1003 | .install = netns_install, | |
1004 | }; | |
1005 | #endif |