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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 int net_assign_generic(struct net *net, int id, void *data) |
31 | { | |
32 | struct net_generic *ng, *old_ng; | |
33 | ||
34 | BUG_ON(!mutex_is_locked(&net_mutex)); | |
35 | BUG_ON(id == 0); | |
36 | ||
1c87733d ED |
37 | old_ng = rcu_dereference_protected(net->gen, |
38 | lockdep_is_held(&net_mutex)); | |
39 | ng = old_ng; | |
05fceb4a JP |
40 | if (old_ng->len >= id) |
41 | goto assign; | |
42 | ||
43 | ng = kzalloc(sizeof(struct net_generic) + | |
44 | id * sizeof(void *), GFP_KERNEL); | |
45 | if (ng == NULL) | |
46 | return -ENOMEM; | |
47 | ||
48 | /* | |
49 | * Some synchronisation notes: | |
50 | * | |
51 | * The net_generic explores the net->gen array inside rcu | |
52 | * read section. Besides once set the net->gen->ptr[x] | |
53 | * pointer never changes (see rules in netns/generic.h). | |
54 | * | |
55 | * That said, we simply duplicate this array and schedule | |
56 | * the old copy for kfree after a grace period. | |
57 | */ | |
58 | ||
59 | ng->len = id; | |
60 | memcpy(&ng->ptr, &old_ng->ptr, old_ng->len * sizeof(void*)); | |
61 | ||
62 | rcu_assign_pointer(net->gen, ng); | |
04d4dfed | 63 | kfree_rcu(old_ng, rcu); |
05fceb4a JP |
64 | assign: |
65 | ng->ptr[id - 1] = data; | |
66 | return 0; | |
67 | } | |
68 | ||
f875bae0 EB |
69 | static int ops_init(const struct pernet_operations *ops, struct net *net) |
70 | { | |
71 | int err; | |
72 | if (ops->id && ops->size) { | |
73 | void *data = kzalloc(ops->size, GFP_KERNEL); | |
74 | if (!data) | |
75 | return -ENOMEM; | |
76 | ||
77 | err = net_assign_generic(net, *ops->id, data); | |
78 | if (err) { | |
79 | kfree(data); | |
80 | return err; | |
81 | } | |
82 | } | |
83 | if (ops->init) | |
84 | return ops->init(net); | |
85 | return 0; | |
86 | } | |
87 | ||
88 | static void ops_free(const struct pernet_operations *ops, struct net *net) | |
89 | { | |
90 | if (ops->id && ops->size) { | |
91 | int id = *ops->id; | |
92 | kfree(net_generic(net, id)); | |
93 | } | |
94 | } | |
95 | ||
72ad937a EB |
96 | static void ops_exit_list(const struct pernet_operations *ops, |
97 | struct list_head *net_exit_list) | |
98 | { | |
99 | struct net *net; | |
100 | if (ops->exit) { | |
101 | list_for_each_entry(net, net_exit_list, exit_list) | |
102 | ops->exit(net); | |
103 | } | |
72ad937a EB |
104 | if (ops->exit_batch) |
105 | ops->exit_batch(net_exit_list); | |
106 | } | |
107 | ||
108 | static void ops_free_list(const struct pernet_operations *ops, | |
109 | struct list_head *net_exit_list) | |
110 | { | |
111 | struct net *net; | |
112 | if (ops->size && ops->id) { | |
113 | list_for_each_entry(net, net_exit_list, exit_list) | |
114 | ops_free(ops, net); | |
115 | } | |
116 | } | |
117 | ||
5f256bec EB |
118 | /* |
119 | * setup_net runs the initializers for the network namespace object. | |
120 | */ | |
1a2ee93d | 121 | static __net_init int setup_net(struct net *net) |
5f256bec EB |
122 | { |
123 | /* Must be called with net_mutex held */ | |
f875bae0 | 124 | const struct pernet_operations *ops, *saved_ops; |
486a87f1 | 125 | int error = 0; |
72ad937a | 126 | LIST_HEAD(net_exit_list); |
5f256bec | 127 | |
5f256bec | 128 | atomic_set(&net->count, 1); |
486a87f1 | 129 | |
5d1e4468 | 130 | #ifdef NETNS_REFCNT_DEBUG |
5f256bec | 131 | atomic_set(&net->use_count, 0); |
5d1e4468 | 132 | #endif |
5f256bec | 133 | |
768f3591 | 134 | list_for_each_entry(ops, &pernet_list, list) { |
f875bae0 EB |
135 | error = ops_init(ops, net); |
136 | if (error < 0) | |
137 | goto out_undo; | |
5f256bec EB |
138 | } |
139 | out: | |
140 | return error; | |
768f3591 | 141 | |
5f256bec EB |
142 | out_undo: |
143 | /* Walk through the list backwards calling the exit functions | |
144 | * for the pernet modules whose init functions did not fail. | |
145 | */ | |
72ad937a | 146 | list_add(&net->exit_list, &net_exit_list); |
f875bae0 | 147 | saved_ops = ops; |
72ad937a EB |
148 | list_for_each_entry_continue_reverse(ops, &pernet_list, list) |
149 | ops_exit_list(ops, &net_exit_list); | |
150 | ||
f875bae0 EB |
151 | ops = saved_ops; |
152 | list_for_each_entry_continue_reverse(ops, &pernet_list, list) | |
72ad937a | 153 | ops_free_list(ops, &net_exit_list); |
310928d9 DL |
154 | |
155 | rcu_barrier(); | |
5f256bec EB |
156 | goto out; |
157 | } | |
158 | ||
486a87f1 | 159 | static struct net_generic *net_alloc_generic(void) |
6a1a3b9f | 160 | { |
486a87f1 DL |
161 | struct net_generic *ng; |
162 | size_t generic_size = sizeof(struct net_generic) + | |
163 | INITIAL_NET_GEN_PTRS * sizeof(void *); | |
164 | ||
165 | ng = kzalloc(generic_size, GFP_KERNEL); | |
166 | if (ng) | |
167 | ng->len = INITIAL_NET_GEN_PTRS; | |
168 | ||
169 | return ng; | |
6a1a3b9f PE |
170 | } |
171 | ||
ebe47d47 CN |
172 | #ifdef CONFIG_NET_NS |
173 | static struct kmem_cache *net_cachep; | |
174 | static struct workqueue_struct *netns_wq; | |
175 | ||
486a87f1 | 176 | static struct net *net_alloc(void) |
45a19b0a | 177 | { |
486a87f1 DL |
178 | struct net *net = NULL; |
179 | struct net_generic *ng; | |
180 | ||
181 | ng = net_alloc_generic(); | |
182 | if (!ng) | |
183 | goto out; | |
184 | ||
185 | net = kmem_cache_zalloc(net_cachep, GFP_KERNEL); | |
45a19b0a | 186 | if (!net) |
486a87f1 | 187 | goto out_free; |
45a19b0a | 188 | |
486a87f1 DL |
189 | rcu_assign_pointer(net->gen, ng); |
190 | out: | |
191 | return net; | |
192 | ||
193 | out_free: | |
194 | kfree(ng); | |
195 | goto out; | |
196 | } | |
197 | ||
198 | static void net_free(struct net *net) | |
199 | { | |
5d1e4468 | 200 | #ifdef NETNS_REFCNT_DEBUG |
45a19b0a JFS |
201 | if (unlikely(atomic_read(&net->use_count) != 0)) { |
202 | printk(KERN_EMERG "network namespace not free! Usage: %d\n", | |
203 | atomic_read(&net->use_count)); | |
204 | return; | |
205 | } | |
5d1e4468 | 206 | #endif |
4ef079cc | 207 | kfree(net->gen); |
45a19b0a JFS |
208 | kmem_cache_free(net_cachep, net); |
209 | } | |
210 | ||
911cb193 | 211 | struct net *copy_net_ns(unsigned long flags, struct net *old_net) |
9dd776b6 | 212 | { |
088eb2d9 AD |
213 | struct net *net; |
214 | int rv; | |
9dd776b6 | 215 | |
911cb193 RL |
216 | if (!(flags & CLONE_NEWNET)) |
217 | return get_net(old_net); | |
218 | ||
088eb2d9 AD |
219 | net = net_alloc(); |
220 | if (!net) | |
221 | return ERR_PTR(-ENOMEM); | |
9dd776b6 | 222 | mutex_lock(&net_mutex); |
088eb2d9 AD |
223 | rv = setup_net(net); |
224 | if (rv == 0) { | |
486a87f1 | 225 | rtnl_lock(); |
11a28d37 | 226 | list_add_tail_rcu(&net->list, &net_namespace_list); |
486a87f1 DL |
227 | rtnl_unlock(); |
228 | } | |
9dd776b6 | 229 | mutex_unlock(&net_mutex); |
088eb2d9 AD |
230 | if (rv < 0) { |
231 | net_free(net); | |
232 | return ERR_PTR(rv); | |
233 | } | |
234 | return net; | |
235 | } | |
486a87f1 | 236 | |
2b035b39 EB |
237 | static DEFINE_SPINLOCK(cleanup_list_lock); |
238 | static LIST_HEAD(cleanup_list); /* Must hold cleanup_list_lock to touch */ | |
239 | ||
6a1a3b9f PE |
240 | static void cleanup_net(struct work_struct *work) |
241 | { | |
f875bae0 | 242 | const struct pernet_operations *ops; |
2b035b39 EB |
243 | struct net *net, *tmp; |
244 | LIST_HEAD(net_kill_list); | |
72ad937a | 245 | LIST_HEAD(net_exit_list); |
6a1a3b9f | 246 | |
2b035b39 EB |
247 | /* Atomically snapshot the list of namespaces to cleanup */ |
248 | spin_lock_irq(&cleanup_list_lock); | |
249 | list_replace_init(&cleanup_list, &net_kill_list); | |
250 | spin_unlock_irq(&cleanup_list_lock); | |
6a1a3b9f PE |
251 | |
252 | mutex_lock(&net_mutex); | |
253 | ||
254 | /* Don't let anyone else find us. */ | |
255 | rtnl_lock(); | |
72ad937a | 256 | list_for_each_entry(net, &net_kill_list, cleanup_list) { |
2b035b39 | 257 | list_del_rcu(&net->list); |
72ad937a EB |
258 | list_add_tail(&net->exit_list, &net_exit_list); |
259 | } | |
6a1a3b9f PE |
260 | rtnl_unlock(); |
261 | ||
11a28d37 JB |
262 | /* |
263 | * Another CPU might be rcu-iterating the list, wait for it. | |
264 | * This needs to be before calling the exit() notifiers, so | |
265 | * the rcu_barrier() below isn't sufficient alone. | |
266 | */ | |
267 | synchronize_rcu(); | |
268 | ||
6a1a3b9f | 269 | /* Run all of the network namespace exit methods */ |
72ad937a EB |
270 | list_for_each_entry_reverse(ops, &pernet_list, list) |
271 | ops_exit_list(ops, &net_exit_list); | |
272 | ||
f875bae0 | 273 | /* Free the net generic variables */ |
72ad937a EB |
274 | list_for_each_entry_reverse(ops, &pernet_list, list) |
275 | ops_free_list(ops, &net_exit_list); | |
6a1a3b9f PE |
276 | |
277 | mutex_unlock(&net_mutex); | |
278 | ||
279 | /* Ensure there are no outstanding rcu callbacks using this | |
280 | * network namespace. | |
281 | */ | |
282 | rcu_barrier(); | |
283 | ||
284 | /* Finally it is safe to free my network namespace structure */ | |
72ad937a EB |
285 | list_for_each_entry_safe(net, tmp, &net_exit_list, exit_list) { |
286 | list_del_init(&net->exit_list); | |
2b035b39 EB |
287 | net_free(net); |
288 | } | |
6a1a3b9f | 289 | } |
2b035b39 | 290 | static DECLARE_WORK(net_cleanup_work, cleanup_net); |
6a1a3b9f PE |
291 | |
292 | void __put_net(struct net *net) | |
293 | { | |
294 | /* Cleanup the network namespace in process context */ | |
2b035b39 EB |
295 | unsigned long flags; |
296 | ||
297 | spin_lock_irqsave(&cleanup_list_lock, flags); | |
298 | list_add(&net->cleanup_list, &cleanup_list); | |
299 | spin_unlock_irqrestore(&cleanup_list_lock, flags); | |
300 | ||
301 | queue_work(netns_wq, &net_cleanup_work); | |
6a1a3b9f PE |
302 | } |
303 | EXPORT_SYMBOL_GPL(__put_net); | |
304 | ||
305 | #else | |
306 | struct net *copy_net_ns(unsigned long flags, struct net *old_net) | |
307 | { | |
308 | if (flags & CLONE_NEWNET) | |
309 | return ERR_PTR(-EINVAL); | |
310 | return old_net; | |
311 | } | |
312 | #endif | |
313 | ||
30ffee84 JB |
314 | struct net *get_net_ns_by_pid(pid_t pid) |
315 | { | |
316 | struct task_struct *tsk; | |
317 | struct net *net; | |
318 | ||
319 | /* Lookup the network namespace */ | |
320 | net = ERR_PTR(-ESRCH); | |
321 | rcu_read_lock(); | |
322 | tsk = find_task_by_vpid(pid); | |
323 | if (tsk) { | |
324 | struct nsproxy *nsproxy; | |
325 | nsproxy = task_nsproxy(tsk); | |
326 | if (nsproxy) | |
327 | net = get_net(nsproxy->net_ns); | |
328 | } | |
329 | rcu_read_unlock(); | |
330 | return net; | |
331 | } | |
332 | EXPORT_SYMBOL_GPL(get_net_ns_by_pid); | |
333 | ||
5f256bec EB |
334 | static int __init net_ns_init(void) |
335 | { | |
486a87f1 | 336 | struct net_generic *ng; |
5f256bec | 337 | |
d57a9212 | 338 | #ifdef CONFIG_NET_NS |
5f256bec EB |
339 | net_cachep = kmem_cache_create("net_namespace", sizeof(struct net), |
340 | SMP_CACHE_BYTES, | |
341 | SLAB_PANIC, NULL); | |
3ef1355d BT |
342 | |
343 | /* Create workqueue for cleanup */ | |
344 | netns_wq = create_singlethread_workqueue("netns"); | |
345 | if (!netns_wq) | |
346 | panic("Could not create netns workq"); | |
d57a9212 | 347 | #endif |
3ef1355d | 348 | |
486a87f1 DL |
349 | ng = net_alloc_generic(); |
350 | if (!ng) | |
351 | panic("Could not allocate generic netns"); | |
352 | ||
353 | rcu_assign_pointer(init_net.gen, ng); | |
354 | ||
5f256bec | 355 | mutex_lock(&net_mutex); |
ca0f3112 SH |
356 | if (setup_net(&init_net)) |
357 | panic("Could not setup the initial network namespace"); | |
5f256bec | 358 | |
f4618d39 | 359 | rtnl_lock(); |
11a28d37 | 360 | list_add_tail_rcu(&init_net.list, &net_namespace_list); |
f4618d39 | 361 | rtnl_unlock(); |
5f256bec EB |
362 | |
363 | mutex_unlock(&net_mutex); | |
5f256bec EB |
364 | |
365 | return 0; | |
366 | } | |
367 | ||
368 | pure_initcall(net_ns_init); | |
369 | ||
ed160e83 | 370 | #ifdef CONFIG_NET_NS |
f875bae0 EB |
371 | static int __register_pernet_operations(struct list_head *list, |
372 | struct pernet_operations *ops) | |
5f256bec | 373 | { |
72ad937a | 374 | struct net *net; |
5f256bec | 375 | int error; |
72ad937a | 376 | LIST_HEAD(net_exit_list); |
5f256bec | 377 | |
5f256bec | 378 | list_add_tail(&ops->list, list); |
f875bae0 | 379 | if (ops->init || (ops->id && ops->size)) { |
1dba323b | 380 | for_each_net(net) { |
f875bae0 | 381 | error = ops_init(ops, net); |
5f256bec EB |
382 | if (error) |
383 | goto out_undo; | |
72ad937a | 384 | list_add_tail(&net->exit_list, &net_exit_list); |
5f256bec EB |
385 | } |
386 | } | |
1dba323b | 387 | return 0; |
5f256bec EB |
388 | |
389 | out_undo: | |
390 | /* If I have an error cleanup all namespaces I initialized */ | |
391 | list_del(&ops->list); | |
72ad937a EB |
392 | ops_exit_list(ops, &net_exit_list); |
393 | ops_free_list(ops, &net_exit_list); | |
1dba323b | 394 | return error; |
5f256bec EB |
395 | } |
396 | ||
f875bae0 | 397 | static void __unregister_pernet_operations(struct pernet_operations *ops) |
5f256bec EB |
398 | { |
399 | struct net *net; | |
72ad937a | 400 | LIST_HEAD(net_exit_list); |
5f256bec EB |
401 | |
402 | list_del(&ops->list); | |
72ad937a EB |
403 | for_each_net(net) |
404 | list_add_tail(&net->exit_list, &net_exit_list); | |
405 | ops_exit_list(ops, &net_exit_list); | |
406 | ops_free_list(ops, &net_exit_list); | |
5f256bec EB |
407 | } |
408 | ||
ed160e83 DL |
409 | #else |
410 | ||
f875bae0 EB |
411 | static int __register_pernet_operations(struct list_head *list, |
412 | struct pernet_operations *ops) | |
ed160e83 | 413 | { |
f875bae0 EB |
414 | int err = 0; |
415 | err = ops_init(ops, &init_net); | |
416 | if (err) | |
417 | ops_free(ops, &init_net); | |
418 | return err; | |
419 | ||
ed160e83 DL |
420 | } |
421 | ||
f875bae0 | 422 | static void __unregister_pernet_operations(struct pernet_operations *ops) |
ed160e83 | 423 | { |
72ad937a EB |
424 | LIST_HEAD(net_exit_list); |
425 | list_add(&init_net.exit_list, &net_exit_list); | |
426 | ops_exit_list(ops, &net_exit_list); | |
427 | ops_free_list(ops, &net_exit_list); | |
ed160e83 | 428 | } |
f875bae0 EB |
429 | |
430 | #endif /* CONFIG_NET_NS */ | |
ed160e83 | 431 | |
c93cf61f PE |
432 | static DEFINE_IDA(net_generic_ids); |
433 | ||
f875bae0 EB |
434 | static int register_pernet_operations(struct list_head *list, |
435 | struct pernet_operations *ops) | |
436 | { | |
437 | int error; | |
438 | ||
439 | if (ops->id) { | |
440 | again: | |
441 | error = ida_get_new_above(&net_generic_ids, 1, ops->id); | |
442 | if (error < 0) { | |
443 | if (error == -EAGAIN) { | |
444 | ida_pre_get(&net_generic_ids, GFP_KERNEL); | |
445 | goto again; | |
446 | } | |
447 | return error; | |
448 | } | |
449 | } | |
450 | error = __register_pernet_operations(list, ops); | |
3a765eda EB |
451 | if (error) { |
452 | rcu_barrier(); | |
453 | if (ops->id) | |
454 | ida_remove(&net_generic_ids, *ops->id); | |
455 | } | |
f875bae0 EB |
456 | |
457 | return error; | |
458 | } | |
459 | ||
460 | static void unregister_pernet_operations(struct pernet_operations *ops) | |
461 | { | |
462 | ||
463 | __unregister_pernet_operations(ops); | |
3a765eda | 464 | rcu_barrier(); |
f875bae0 EB |
465 | if (ops->id) |
466 | ida_remove(&net_generic_ids, *ops->id); | |
467 | } | |
468 | ||
5f256bec EB |
469 | /** |
470 | * register_pernet_subsys - register a network namespace subsystem | |
471 | * @ops: pernet operations structure for the subsystem | |
472 | * | |
473 | * Register a subsystem which has init and exit functions | |
474 | * that are called when network namespaces are created and | |
475 | * destroyed respectively. | |
476 | * | |
477 | * When registered all network namespace init functions are | |
478 | * called for every existing network namespace. Allowing kernel | |
479 | * modules to have a race free view of the set of network namespaces. | |
480 | * | |
481 | * When a new network namespace is created all of the init | |
482 | * methods are called in the order in which they were registered. | |
483 | * | |
484 | * When a network namespace is destroyed all of the exit methods | |
485 | * are called in the reverse of the order with which they were | |
486 | * registered. | |
487 | */ | |
488 | int register_pernet_subsys(struct pernet_operations *ops) | |
489 | { | |
490 | int error; | |
491 | mutex_lock(&net_mutex); | |
492 | error = register_pernet_operations(first_device, ops); | |
493 | mutex_unlock(&net_mutex); | |
494 | return error; | |
495 | } | |
496 | EXPORT_SYMBOL_GPL(register_pernet_subsys); | |
497 | ||
498 | /** | |
499 | * unregister_pernet_subsys - unregister a network namespace subsystem | |
500 | * @ops: pernet operations structure to manipulate | |
501 | * | |
502 | * Remove the pernet operations structure from the list to be | |
53379e57 | 503 | * used when network namespaces are created or destroyed. In |
5f256bec EB |
504 | * addition run the exit method for all existing network |
505 | * namespaces. | |
506 | */ | |
b3c981d2 | 507 | void unregister_pernet_subsys(struct pernet_operations *ops) |
5f256bec EB |
508 | { |
509 | mutex_lock(&net_mutex); | |
b3c981d2 | 510 | unregister_pernet_operations(ops); |
5f256bec EB |
511 | mutex_unlock(&net_mutex); |
512 | } | |
513 | EXPORT_SYMBOL_GPL(unregister_pernet_subsys); | |
514 | ||
515 | /** | |
516 | * register_pernet_device - register a network namespace device | |
517 | * @ops: pernet operations structure for the subsystem | |
518 | * | |
519 | * Register a device which has init and exit functions | |
520 | * that are called when network namespaces are created and | |
521 | * destroyed respectively. | |
522 | * | |
523 | * When registered all network namespace init functions are | |
524 | * called for every existing network namespace. Allowing kernel | |
525 | * modules to have a race free view of the set of network namespaces. | |
526 | * | |
527 | * When a new network namespace is created all of the init | |
528 | * methods are called in the order in which they were registered. | |
529 | * | |
530 | * When a network namespace is destroyed all of the exit methods | |
531 | * are called in the reverse of the order with which they were | |
532 | * registered. | |
533 | */ | |
534 | int register_pernet_device(struct pernet_operations *ops) | |
535 | { | |
536 | int error; | |
537 | mutex_lock(&net_mutex); | |
538 | error = register_pernet_operations(&pernet_list, ops); | |
539 | if (!error && (first_device == &pernet_list)) | |
540 | first_device = &ops->list; | |
541 | mutex_unlock(&net_mutex); | |
542 | return error; | |
543 | } | |
544 | EXPORT_SYMBOL_GPL(register_pernet_device); | |
545 | ||
546 | /** | |
547 | * unregister_pernet_device - unregister a network namespace netdevice | |
548 | * @ops: pernet operations structure to manipulate | |
549 | * | |
550 | * Remove the pernet operations structure from the list to be | |
53379e57 | 551 | * used when network namespaces are created or destroyed. In |
5f256bec EB |
552 | * addition run the exit method for all existing network |
553 | * namespaces. | |
554 | */ | |
555 | void unregister_pernet_device(struct pernet_operations *ops) | |
556 | { | |
557 | mutex_lock(&net_mutex); | |
558 | if (&ops->list == first_device) | |
559 | first_device = first_device->next; | |
560 | unregister_pernet_operations(ops); | |
561 | mutex_unlock(&net_mutex); | |
562 | } | |
563 | EXPORT_SYMBOL_GPL(unregister_pernet_device); |