Commit | Line | Data |
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5f256bec EB |
1 | #include <linux/workqueue.h> |
2 | #include <linux/rtnetlink.h> | |
3 | #include <linux/cache.h> | |
4 | #include <linux/slab.h> | |
5 | #include <linux/list.h> | |
6 | #include <linux/delay.h> | |
9dd776b6 | 7 | #include <linux/sched.h> |
c93cf61f | 8 | #include <linux/idr.h> |
11a28d37 | 9 | #include <linux/rculist.h> |
30ffee84 | 10 | #include <linux/nsproxy.h> |
5f256bec | 11 | #include <net/net_namespace.h> |
dec827d1 | 12 | #include <net/netns/generic.h> |
5f256bec EB |
13 | |
14 | /* | |
15 | * Our network namespace constructor/destructor lists | |
16 | */ | |
17 | ||
18 | static LIST_HEAD(pernet_list); | |
19 | static struct list_head *first_device = &pernet_list; | |
20 | static DEFINE_MUTEX(net_mutex); | |
21 | ||
5f256bec | 22 | LIST_HEAD(net_namespace_list); |
b76a461f | 23 | EXPORT_SYMBOL_GPL(net_namespace_list); |
5f256bec | 24 | |
5f256bec | 25 | struct net init_net; |
ff4b9502 | 26 | EXPORT_SYMBOL(init_net); |
5f256bec | 27 | |
dec827d1 PE |
28 | #define INITIAL_NET_GEN_PTRS 13 /* +1 for len +2 for rcu_head */ |
29 | ||
05fceb4a JP |
30 | static void net_generic_release(struct rcu_head *rcu) |
31 | { | |
32 | struct net_generic *ng; | |
33 | ||
34 | ng = container_of(rcu, struct net_generic, rcu); | |
35 | kfree(ng); | |
36 | } | |
37 | ||
38 | static int net_assign_generic(struct net *net, int id, void *data) | |
39 | { | |
40 | struct net_generic *ng, *old_ng; | |
41 | ||
42 | BUG_ON(!mutex_is_locked(&net_mutex)); | |
43 | BUG_ON(id == 0); | |
44 | ||
45 | ng = old_ng = net->gen; | |
46 | if (old_ng->len >= id) | |
47 | goto assign; | |
48 | ||
49 | ng = kzalloc(sizeof(struct net_generic) + | |
50 | id * sizeof(void *), GFP_KERNEL); | |
51 | if (ng == NULL) | |
52 | return -ENOMEM; | |
53 | ||
54 | /* | |
55 | * Some synchronisation notes: | |
56 | * | |
57 | * The net_generic explores the net->gen array inside rcu | |
58 | * read section. Besides once set the net->gen->ptr[x] | |
59 | * pointer never changes (see rules in netns/generic.h). | |
60 | * | |
61 | * That said, we simply duplicate this array and schedule | |
62 | * the old copy for kfree after a grace period. | |
63 | */ | |
64 | ||
65 | ng->len = id; | |
66 | memcpy(&ng->ptr, &old_ng->ptr, old_ng->len * sizeof(void*)); | |
67 | ||
68 | rcu_assign_pointer(net->gen, ng); | |
69 | call_rcu(&old_ng->rcu, net_generic_release); | |
70 | assign: | |
71 | ng->ptr[id - 1] = data; | |
72 | return 0; | |
73 | } | |
74 | ||
f875bae0 EB |
75 | static int ops_init(const struct pernet_operations *ops, struct net *net) |
76 | { | |
77 | int err; | |
78 | if (ops->id && ops->size) { | |
79 | void *data = kzalloc(ops->size, GFP_KERNEL); | |
80 | if (!data) | |
81 | return -ENOMEM; | |
82 | ||
83 | err = net_assign_generic(net, *ops->id, data); | |
84 | if (err) { | |
85 | kfree(data); | |
86 | return err; | |
87 | } | |
88 | } | |
89 | if (ops->init) | |
90 | return ops->init(net); | |
91 | return 0; | |
92 | } | |
93 | ||
94 | static void ops_free(const struct pernet_operations *ops, struct net *net) | |
95 | { | |
96 | if (ops->id && ops->size) { | |
97 | int id = *ops->id; | |
98 | kfree(net_generic(net, id)); | |
99 | } | |
100 | } | |
101 | ||
72ad937a EB |
102 | static void ops_exit_list(const struct pernet_operations *ops, |
103 | struct list_head *net_exit_list) | |
104 | { | |
105 | struct net *net; | |
106 | if (ops->exit) { | |
107 | list_for_each_entry(net, net_exit_list, exit_list) | |
108 | ops->exit(net); | |
109 | } | |
72ad937a EB |
110 | if (ops->exit_batch) |
111 | ops->exit_batch(net_exit_list); | |
112 | } | |
113 | ||
114 | static void ops_free_list(const struct pernet_operations *ops, | |
115 | struct list_head *net_exit_list) | |
116 | { | |
117 | struct net *net; | |
118 | if (ops->size && ops->id) { | |
119 | list_for_each_entry(net, net_exit_list, exit_list) | |
120 | ops_free(ops, net); | |
121 | } | |
122 | } | |
123 | ||
5f256bec EB |
124 | /* |
125 | * setup_net runs the initializers for the network namespace object. | |
126 | */ | |
1a2ee93d | 127 | static __net_init int setup_net(struct net *net) |
5f256bec EB |
128 | { |
129 | /* Must be called with net_mutex held */ | |
f875bae0 | 130 | const struct pernet_operations *ops, *saved_ops; |
486a87f1 | 131 | int error = 0; |
72ad937a | 132 | LIST_HEAD(net_exit_list); |
5f256bec | 133 | |
5f256bec | 134 | atomic_set(&net->count, 1); |
486a87f1 | 135 | |
5d1e4468 | 136 | #ifdef NETNS_REFCNT_DEBUG |
5f256bec | 137 | atomic_set(&net->use_count, 0); |
5d1e4468 | 138 | #endif |
5f256bec | 139 | |
768f3591 | 140 | list_for_each_entry(ops, &pernet_list, list) { |
f875bae0 EB |
141 | error = ops_init(ops, net); |
142 | if (error < 0) | |
143 | goto out_undo; | |
5f256bec EB |
144 | } |
145 | out: | |
146 | return error; | |
768f3591 | 147 | |
5f256bec EB |
148 | out_undo: |
149 | /* Walk through the list backwards calling the exit functions | |
150 | * for the pernet modules whose init functions did not fail. | |
151 | */ | |
72ad937a | 152 | list_add(&net->exit_list, &net_exit_list); |
f875bae0 | 153 | saved_ops = ops; |
72ad937a EB |
154 | list_for_each_entry_continue_reverse(ops, &pernet_list, list) |
155 | ops_exit_list(ops, &net_exit_list); | |
156 | ||
f875bae0 EB |
157 | ops = saved_ops; |
158 | list_for_each_entry_continue_reverse(ops, &pernet_list, list) | |
72ad937a | 159 | ops_free_list(ops, &net_exit_list); |
310928d9 DL |
160 | |
161 | rcu_barrier(); | |
5f256bec EB |
162 | goto out; |
163 | } | |
164 | ||
486a87f1 | 165 | static struct net_generic *net_alloc_generic(void) |
6a1a3b9f | 166 | { |
486a87f1 DL |
167 | struct net_generic *ng; |
168 | size_t generic_size = sizeof(struct net_generic) + | |
169 | INITIAL_NET_GEN_PTRS * sizeof(void *); | |
170 | ||
171 | ng = kzalloc(generic_size, GFP_KERNEL); | |
172 | if (ng) | |
173 | ng->len = INITIAL_NET_GEN_PTRS; | |
174 | ||
175 | return ng; | |
6a1a3b9f PE |
176 | } |
177 | ||
ebe47d47 CN |
178 | #ifdef CONFIG_NET_NS |
179 | static struct kmem_cache *net_cachep; | |
180 | static struct workqueue_struct *netns_wq; | |
181 | ||
486a87f1 | 182 | static struct net *net_alloc(void) |
45a19b0a | 183 | { |
486a87f1 DL |
184 | struct net *net = NULL; |
185 | struct net_generic *ng; | |
186 | ||
187 | ng = net_alloc_generic(); | |
188 | if (!ng) | |
189 | goto out; | |
190 | ||
191 | net = kmem_cache_zalloc(net_cachep, GFP_KERNEL); | |
45a19b0a | 192 | if (!net) |
486a87f1 | 193 | goto out_free; |
45a19b0a | 194 | |
486a87f1 DL |
195 | rcu_assign_pointer(net->gen, ng); |
196 | out: | |
197 | return net; | |
198 | ||
199 | out_free: | |
200 | kfree(ng); | |
201 | goto out; | |
202 | } | |
203 | ||
204 | static void net_free(struct net *net) | |
205 | { | |
5d1e4468 | 206 | #ifdef NETNS_REFCNT_DEBUG |
45a19b0a JFS |
207 | if (unlikely(atomic_read(&net->use_count) != 0)) { |
208 | printk(KERN_EMERG "network namespace not free! Usage: %d\n", | |
209 | atomic_read(&net->use_count)); | |
210 | return; | |
211 | } | |
5d1e4468 | 212 | #endif |
4ef079cc | 213 | kfree(net->gen); |
45a19b0a JFS |
214 | kmem_cache_free(net_cachep, net); |
215 | } | |
216 | ||
088eb2d9 | 217 | static struct net *net_create(void) |
9dd776b6 | 218 | { |
088eb2d9 AD |
219 | struct net *net; |
220 | int rv; | |
9dd776b6 | 221 | |
088eb2d9 AD |
222 | net = net_alloc(); |
223 | if (!net) | |
224 | return ERR_PTR(-ENOMEM); | |
9dd776b6 | 225 | mutex_lock(&net_mutex); |
088eb2d9 AD |
226 | rv = setup_net(net); |
227 | if (rv == 0) { | |
486a87f1 | 228 | rtnl_lock(); |
11a28d37 | 229 | list_add_tail_rcu(&net->list, &net_namespace_list); |
486a87f1 DL |
230 | rtnl_unlock(); |
231 | } | |
9dd776b6 | 232 | mutex_unlock(&net_mutex); |
088eb2d9 AD |
233 | if (rv < 0) { |
234 | net_free(net); | |
235 | return ERR_PTR(rv); | |
236 | } | |
237 | return net; | |
238 | } | |
486a87f1 | 239 | |
088eb2d9 AD |
240 | struct net *copy_net_ns(unsigned long flags, struct net *old_net) |
241 | { | |
242 | if (!(flags & CLONE_NEWNET)) | |
243 | return get_net(old_net); | |
244 | return net_create(); | |
9dd776b6 EB |
245 | } |
246 | ||
2b035b39 EB |
247 | static DEFINE_SPINLOCK(cleanup_list_lock); |
248 | static LIST_HEAD(cleanup_list); /* Must hold cleanup_list_lock to touch */ | |
249 | ||
6a1a3b9f PE |
250 | static void cleanup_net(struct work_struct *work) |
251 | { | |
f875bae0 | 252 | const struct pernet_operations *ops; |
2b035b39 EB |
253 | struct net *net, *tmp; |
254 | LIST_HEAD(net_kill_list); | |
72ad937a | 255 | LIST_HEAD(net_exit_list); |
6a1a3b9f | 256 | |
2b035b39 EB |
257 | /* Atomically snapshot the list of namespaces to cleanup */ |
258 | spin_lock_irq(&cleanup_list_lock); | |
259 | list_replace_init(&cleanup_list, &net_kill_list); | |
260 | spin_unlock_irq(&cleanup_list_lock); | |
6a1a3b9f PE |
261 | |
262 | mutex_lock(&net_mutex); | |
263 | ||
264 | /* Don't let anyone else find us. */ | |
265 | rtnl_lock(); | |
72ad937a | 266 | list_for_each_entry(net, &net_kill_list, cleanup_list) { |
2b035b39 | 267 | list_del_rcu(&net->list); |
72ad937a EB |
268 | list_add_tail(&net->exit_list, &net_exit_list); |
269 | } | |
6a1a3b9f PE |
270 | rtnl_unlock(); |
271 | ||
11a28d37 JB |
272 | /* |
273 | * Another CPU might be rcu-iterating the list, wait for it. | |
274 | * This needs to be before calling the exit() notifiers, so | |
275 | * the rcu_barrier() below isn't sufficient alone. | |
276 | */ | |
277 | synchronize_rcu(); | |
278 | ||
6a1a3b9f | 279 | /* Run all of the network namespace exit methods */ |
72ad937a EB |
280 | list_for_each_entry_reverse(ops, &pernet_list, list) |
281 | ops_exit_list(ops, &net_exit_list); | |
282 | ||
f875bae0 | 283 | /* Free the net generic variables */ |
72ad937a EB |
284 | list_for_each_entry_reverse(ops, &pernet_list, list) |
285 | ops_free_list(ops, &net_exit_list); | |
6a1a3b9f PE |
286 | |
287 | mutex_unlock(&net_mutex); | |
288 | ||
289 | /* Ensure there are no outstanding rcu callbacks using this | |
290 | * network namespace. | |
291 | */ | |
292 | rcu_barrier(); | |
293 | ||
294 | /* Finally it is safe to free my network namespace structure */ | |
72ad937a EB |
295 | list_for_each_entry_safe(net, tmp, &net_exit_list, exit_list) { |
296 | list_del_init(&net->exit_list); | |
2b035b39 EB |
297 | net_free(net); |
298 | } | |
6a1a3b9f | 299 | } |
2b035b39 | 300 | static DECLARE_WORK(net_cleanup_work, cleanup_net); |
6a1a3b9f PE |
301 | |
302 | void __put_net(struct net *net) | |
303 | { | |
304 | /* Cleanup the network namespace in process context */ | |
2b035b39 EB |
305 | unsigned long flags; |
306 | ||
307 | spin_lock_irqsave(&cleanup_list_lock, flags); | |
308 | list_add(&net->cleanup_list, &cleanup_list); | |
309 | spin_unlock_irqrestore(&cleanup_list_lock, flags); | |
310 | ||
311 | queue_work(netns_wq, &net_cleanup_work); | |
6a1a3b9f PE |
312 | } |
313 | EXPORT_SYMBOL_GPL(__put_net); | |
314 | ||
315 | #else | |
316 | struct net *copy_net_ns(unsigned long flags, struct net *old_net) | |
317 | { | |
318 | if (flags & CLONE_NEWNET) | |
319 | return ERR_PTR(-EINVAL); | |
320 | return old_net; | |
321 | } | |
322 | #endif | |
323 | ||
30ffee84 JB |
324 | struct net *get_net_ns_by_pid(pid_t pid) |
325 | { | |
326 | struct task_struct *tsk; | |
327 | struct net *net; | |
328 | ||
329 | /* Lookup the network namespace */ | |
330 | net = ERR_PTR(-ESRCH); | |
331 | rcu_read_lock(); | |
332 | tsk = find_task_by_vpid(pid); | |
333 | if (tsk) { | |
334 | struct nsproxy *nsproxy; | |
335 | nsproxy = task_nsproxy(tsk); | |
336 | if (nsproxy) | |
337 | net = get_net(nsproxy->net_ns); | |
338 | } | |
339 | rcu_read_unlock(); | |
340 | return net; | |
341 | } | |
342 | EXPORT_SYMBOL_GPL(get_net_ns_by_pid); | |
343 | ||
5f256bec EB |
344 | static int __init net_ns_init(void) |
345 | { | |
486a87f1 | 346 | struct net_generic *ng; |
5f256bec | 347 | |
d57a9212 | 348 | #ifdef CONFIG_NET_NS |
5f256bec EB |
349 | net_cachep = kmem_cache_create("net_namespace", sizeof(struct net), |
350 | SMP_CACHE_BYTES, | |
351 | SLAB_PANIC, NULL); | |
3ef1355d BT |
352 | |
353 | /* Create workqueue for cleanup */ | |
354 | netns_wq = create_singlethread_workqueue("netns"); | |
355 | if (!netns_wq) | |
356 | panic("Could not create netns workq"); | |
d57a9212 | 357 | #endif |
3ef1355d | 358 | |
486a87f1 DL |
359 | ng = net_alloc_generic(); |
360 | if (!ng) | |
361 | panic("Could not allocate generic netns"); | |
362 | ||
363 | rcu_assign_pointer(init_net.gen, ng); | |
364 | ||
5f256bec | 365 | mutex_lock(&net_mutex); |
ca0f3112 SH |
366 | if (setup_net(&init_net)) |
367 | panic("Could not setup the initial network namespace"); | |
5f256bec | 368 | |
f4618d39 | 369 | rtnl_lock(); |
11a28d37 | 370 | list_add_tail_rcu(&init_net.list, &net_namespace_list); |
f4618d39 | 371 | rtnl_unlock(); |
5f256bec EB |
372 | |
373 | mutex_unlock(&net_mutex); | |
5f256bec EB |
374 | |
375 | return 0; | |
376 | } | |
377 | ||
378 | pure_initcall(net_ns_init); | |
379 | ||
ed160e83 | 380 | #ifdef CONFIG_NET_NS |
f875bae0 EB |
381 | static int __register_pernet_operations(struct list_head *list, |
382 | struct pernet_operations *ops) | |
5f256bec | 383 | { |
72ad937a | 384 | struct net *net; |
5f256bec | 385 | int error; |
72ad937a | 386 | LIST_HEAD(net_exit_list); |
5f256bec | 387 | |
5f256bec | 388 | list_add_tail(&ops->list, list); |
f875bae0 | 389 | if (ops->init || (ops->id && ops->size)) { |
1dba323b | 390 | for_each_net(net) { |
f875bae0 | 391 | error = ops_init(ops, net); |
5f256bec EB |
392 | if (error) |
393 | goto out_undo; | |
72ad937a | 394 | list_add_tail(&net->exit_list, &net_exit_list); |
5f256bec EB |
395 | } |
396 | } | |
1dba323b | 397 | return 0; |
5f256bec EB |
398 | |
399 | out_undo: | |
400 | /* If I have an error cleanup all namespaces I initialized */ | |
401 | list_del(&ops->list); | |
72ad937a EB |
402 | ops_exit_list(ops, &net_exit_list); |
403 | ops_free_list(ops, &net_exit_list); | |
1dba323b | 404 | return error; |
5f256bec EB |
405 | } |
406 | ||
f875bae0 | 407 | static void __unregister_pernet_operations(struct pernet_operations *ops) |
5f256bec EB |
408 | { |
409 | struct net *net; | |
72ad937a | 410 | LIST_HEAD(net_exit_list); |
5f256bec EB |
411 | |
412 | list_del(&ops->list); | |
72ad937a EB |
413 | for_each_net(net) |
414 | list_add_tail(&net->exit_list, &net_exit_list); | |
415 | ops_exit_list(ops, &net_exit_list); | |
416 | ops_free_list(ops, &net_exit_list); | |
5f256bec EB |
417 | } |
418 | ||
ed160e83 DL |
419 | #else |
420 | ||
f875bae0 EB |
421 | static int __register_pernet_operations(struct list_head *list, |
422 | struct pernet_operations *ops) | |
ed160e83 | 423 | { |
f875bae0 EB |
424 | int err = 0; |
425 | err = ops_init(ops, &init_net); | |
426 | if (err) | |
427 | ops_free(ops, &init_net); | |
428 | return err; | |
429 | ||
ed160e83 DL |
430 | } |
431 | ||
f875bae0 | 432 | static void __unregister_pernet_operations(struct pernet_operations *ops) |
ed160e83 | 433 | { |
72ad937a EB |
434 | LIST_HEAD(net_exit_list); |
435 | list_add(&init_net.exit_list, &net_exit_list); | |
436 | ops_exit_list(ops, &net_exit_list); | |
437 | ops_free_list(ops, &net_exit_list); | |
ed160e83 | 438 | } |
f875bae0 EB |
439 | |
440 | #endif /* CONFIG_NET_NS */ | |
ed160e83 | 441 | |
c93cf61f PE |
442 | static DEFINE_IDA(net_generic_ids); |
443 | ||
f875bae0 EB |
444 | static int register_pernet_operations(struct list_head *list, |
445 | struct pernet_operations *ops) | |
446 | { | |
447 | int error; | |
448 | ||
449 | if (ops->id) { | |
450 | again: | |
451 | error = ida_get_new_above(&net_generic_ids, 1, ops->id); | |
452 | if (error < 0) { | |
453 | if (error == -EAGAIN) { | |
454 | ida_pre_get(&net_generic_ids, GFP_KERNEL); | |
455 | goto again; | |
456 | } | |
457 | return error; | |
458 | } | |
459 | } | |
460 | error = __register_pernet_operations(list, ops); | |
3a765eda EB |
461 | if (error) { |
462 | rcu_barrier(); | |
463 | if (ops->id) | |
464 | ida_remove(&net_generic_ids, *ops->id); | |
465 | } | |
f875bae0 EB |
466 | |
467 | return error; | |
468 | } | |
469 | ||
470 | static void unregister_pernet_operations(struct pernet_operations *ops) | |
471 | { | |
472 | ||
473 | __unregister_pernet_operations(ops); | |
3a765eda | 474 | rcu_barrier(); |
f875bae0 EB |
475 | if (ops->id) |
476 | ida_remove(&net_generic_ids, *ops->id); | |
477 | } | |
478 | ||
5f256bec EB |
479 | /** |
480 | * register_pernet_subsys - register a network namespace subsystem | |
481 | * @ops: pernet operations structure for the subsystem | |
482 | * | |
483 | * Register a subsystem which has init and exit functions | |
484 | * that are called when network namespaces are created and | |
485 | * destroyed respectively. | |
486 | * | |
487 | * When registered all network namespace init functions are | |
488 | * called for every existing network namespace. Allowing kernel | |
489 | * modules to have a race free view of the set of network namespaces. | |
490 | * | |
491 | * When a new network namespace is created all of the init | |
492 | * methods are called in the order in which they were registered. | |
493 | * | |
494 | * When a network namespace is destroyed all of the exit methods | |
495 | * are called in the reverse of the order with which they were | |
496 | * registered. | |
497 | */ | |
498 | int register_pernet_subsys(struct pernet_operations *ops) | |
499 | { | |
500 | int error; | |
501 | mutex_lock(&net_mutex); | |
502 | error = register_pernet_operations(first_device, ops); | |
503 | mutex_unlock(&net_mutex); | |
504 | return error; | |
505 | } | |
506 | EXPORT_SYMBOL_GPL(register_pernet_subsys); | |
507 | ||
508 | /** | |
509 | * unregister_pernet_subsys - unregister a network namespace subsystem | |
510 | * @ops: pernet operations structure to manipulate | |
511 | * | |
512 | * Remove the pernet operations structure from the list to be | |
53379e57 | 513 | * used when network namespaces are created or destroyed. In |
5f256bec EB |
514 | * addition run the exit method for all existing network |
515 | * namespaces. | |
516 | */ | |
b3c981d2 | 517 | void unregister_pernet_subsys(struct pernet_operations *ops) |
5f256bec EB |
518 | { |
519 | mutex_lock(&net_mutex); | |
b3c981d2 | 520 | unregister_pernet_operations(ops); |
5f256bec EB |
521 | mutex_unlock(&net_mutex); |
522 | } | |
523 | EXPORT_SYMBOL_GPL(unregister_pernet_subsys); | |
524 | ||
525 | /** | |
526 | * register_pernet_device - register a network namespace device | |
527 | * @ops: pernet operations structure for the subsystem | |
528 | * | |
529 | * Register a device which has init and exit functions | |
530 | * that are called when network namespaces are created and | |
531 | * destroyed respectively. | |
532 | * | |
533 | * When registered all network namespace init functions are | |
534 | * called for every existing network namespace. Allowing kernel | |
535 | * modules to have a race free view of the set of network namespaces. | |
536 | * | |
537 | * When a new network namespace is created all of the init | |
538 | * methods are called in the order in which they were registered. | |
539 | * | |
540 | * When a network namespace is destroyed all of the exit methods | |
541 | * are called in the reverse of the order with which they were | |
542 | * registered. | |
543 | */ | |
544 | int register_pernet_device(struct pernet_operations *ops) | |
545 | { | |
546 | int error; | |
547 | mutex_lock(&net_mutex); | |
548 | error = register_pernet_operations(&pernet_list, ops); | |
549 | if (!error && (first_device == &pernet_list)) | |
550 | first_device = &ops->list; | |
551 | mutex_unlock(&net_mutex); | |
552 | return error; | |
553 | } | |
554 | EXPORT_SYMBOL_GPL(register_pernet_device); | |
555 | ||
556 | /** | |
557 | * unregister_pernet_device - unregister a network namespace netdevice | |
558 | * @ops: pernet operations structure to manipulate | |
559 | * | |
560 | * Remove the pernet operations structure from the list to be | |
53379e57 | 561 | * used when network namespaces are created or destroyed. In |
5f256bec EB |
562 | * addition run the exit method for all existing network |
563 | * namespaces. | |
564 | */ | |
565 | void unregister_pernet_device(struct pernet_operations *ops) | |
566 | { | |
567 | mutex_lock(&net_mutex); | |
568 | if (&ops->list == first_device) | |
569 | first_device = first_device->next; | |
570 | unregister_pernet_operations(ops); | |
571 | mutex_unlock(&net_mutex); | |
572 | } | |
573 | EXPORT_SYMBOL_GPL(unregister_pernet_device); |