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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/fs/proc/net.c
4 *
5 * Copyright (C) 2007
6 *
7 * Author: Eric Biederman <ebiederm@xmission.com>
8 *
9 * proc net directory handling functions
10 */
11
12#include <linux/uaccess.h>
13
14#include <linux/errno.h>
15#include <linux/time.h>
16#include <linux/proc_fs.h>
17#include <linux/stat.h>
18#include <linux/slab.h>
19#include <linux/init.h>
20#include <linux/sched.h>
21#include <linux/sched/task.h>
22#include <linux/module.h>
23#include <linux/bitops.h>
24#include <linux/mount.h>
25#include <linux/nsproxy.h>
26#include <linux/uidgid.h>
27#include <net/net_namespace.h>
28#include <linux/seq_file.h>
29
30#include "internal.h"
31
32static inline struct net *PDE_NET(struct proc_dir_entry *pde)
33{
34 return pde->parent->data;
35}
36
37static struct net *get_proc_net(const struct inode *inode)
38{
39 return maybe_get_net(PDE_NET(PDE(inode)));
40}
41
42static int seq_open_net(struct inode *inode, struct file *file)
43{
44 unsigned int state_size = PDE(inode)->state_size;
45 struct seq_net_private *p;
46 struct net *net;
47
48 WARN_ON_ONCE(state_size < sizeof(*p));
49
50 if (file->f_mode & FMODE_WRITE && !PDE(inode)->write)
51 return -EACCES;
52
53 net = get_proc_net(inode);
54 if (!net)
55 return -ENXIO;
56
57 p = __seq_open_private(file, PDE(inode)->seq_ops, state_size);
58 if (!p) {
59 put_net(net);
60 return -ENOMEM;
61 }
62#ifdef CONFIG_NET_NS
63 p->net = net;
64#endif
65 return 0;
66}
67
68static int seq_release_net(struct inode *ino, struct file *f)
69{
70 struct seq_file *seq = f->private_data;
71
72 put_net(seq_file_net(seq));
73 seq_release_private(ino, f);
74 return 0;
75}
76
77static const struct proc_ops proc_net_seq_ops = {
78 .proc_open = seq_open_net,
79 .proc_read = seq_read,
80 .proc_write = proc_simple_write,
81 .proc_lseek = seq_lseek,
82 .proc_release = seq_release_net,
83};
84
85int bpf_iter_init_seq_net(void *priv_data, struct bpf_iter_aux_info *aux)
86{
87#ifdef CONFIG_NET_NS
88 struct seq_net_private *p = priv_data;
89
90 p->net = get_net(current->nsproxy->net_ns);
91#endif
92 return 0;
93}
94
95void bpf_iter_fini_seq_net(void *priv_data)
96{
97#ifdef CONFIG_NET_NS
98 struct seq_net_private *p = priv_data;
99
100 put_net(p->net);
101#endif
102}
103
104struct proc_dir_entry *proc_create_net_data(const char *name, umode_t mode,
105 struct proc_dir_entry *parent, const struct seq_operations *ops,
106 unsigned int state_size, void *data)
107{
108 struct proc_dir_entry *p;
109
110 p = proc_create_reg(name, mode, &parent, data);
111 if (!p)
112 return NULL;
113 pde_force_lookup(p);
114 p->proc_ops = &proc_net_seq_ops;
115 p->seq_ops = ops;
116 p->state_size = state_size;
117 return proc_register(parent, p);
118}
119EXPORT_SYMBOL_GPL(proc_create_net_data);
120
121/**
122 * proc_create_net_data_write - Create a writable net_ns-specific proc file
123 * @name: The name of the file.
124 * @mode: The file's access mode.
125 * @parent: The parent directory in which to create.
126 * @ops: The seq_file ops with which to read the file.
127 * @write: The write method with which to 'modify' the file.
128 * @data: Data for retrieval by PDE_DATA().
129 *
130 * Create a network namespaced proc file in the @parent directory with the
131 * specified @name and @mode that allows reading of a file that displays a
132 * series of elements and also provides for the file accepting writes that have
133 * some arbitrary effect.
134 *
135 * The functions in the @ops table are used to iterate over items to be
136 * presented and extract the readable content using the seq_file interface.
137 *
138 * The @write function is called with the data copied into a kernel space
139 * scratch buffer and has a NUL appended for convenience. The buffer may be
140 * modified by the @write function. @write should return 0 on success.
141 *
142 * The @data value is accessible from the @show and @write functions by calling
143 * PDE_DATA() on the file inode. The network namespace must be accessed by
144 * calling seq_file_net() on the seq_file struct.
145 */
146struct proc_dir_entry *proc_create_net_data_write(const char *name, umode_t mode,
147 struct proc_dir_entry *parent,
148 const struct seq_operations *ops,
149 proc_write_t write,
150 unsigned int state_size, void *data)
151{
152 struct proc_dir_entry *p;
153
154 p = proc_create_reg(name, mode, &parent, data);
155 if (!p)
156 return NULL;
157 pde_force_lookup(p);
158 p->proc_ops = &proc_net_seq_ops;
159 p->seq_ops = ops;
160 p->state_size = state_size;
161 p->write = write;
162 return proc_register(parent, p);
163}
164EXPORT_SYMBOL_GPL(proc_create_net_data_write);
165
166static int single_open_net(struct inode *inode, struct file *file)
167{
168 struct proc_dir_entry *de = PDE(inode);
169 struct net *net;
170 int err;
171
172 net = get_proc_net(inode);
173 if (!net)
174 return -ENXIO;
175
176 err = single_open(file, de->single_show, net);
177 if (err)
178 put_net(net);
179 return err;
180}
181
182static int single_release_net(struct inode *ino, struct file *f)
183{
184 struct seq_file *seq = f->private_data;
185 put_net(seq->private);
186 return single_release(ino, f);
187}
188
189static const struct proc_ops proc_net_single_ops = {
190 .proc_open = single_open_net,
191 .proc_read = seq_read,
192 .proc_write = proc_simple_write,
193 .proc_lseek = seq_lseek,
194 .proc_release = single_release_net,
195};
196
197struct proc_dir_entry *proc_create_net_single(const char *name, umode_t mode,
198 struct proc_dir_entry *parent,
199 int (*show)(struct seq_file *, void *), void *data)
200{
201 struct proc_dir_entry *p;
202
203 p = proc_create_reg(name, mode, &parent, data);
204 if (!p)
205 return NULL;
206 pde_force_lookup(p);
207 p->proc_ops = &proc_net_single_ops;
208 p->single_show = show;
209 return proc_register(parent, p);
210}
211EXPORT_SYMBOL_GPL(proc_create_net_single);
212
213/**
214 * proc_create_net_single_write - Create a writable net_ns-specific proc file
215 * @name: The name of the file.
216 * @mode: The file's access mode.
217 * @parent: The parent directory in which to create.
218 * @show: The seqfile show method with which to read the file.
219 * @write: The write method with which to 'modify' the file.
220 * @data: Data for retrieval by PDE_DATA().
221 *
222 * Create a network-namespaced proc file in the @parent directory with the
223 * specified @name and @mode that allows reading of a file that displays a
224 * single element rather than a series and also provides for the file accepting
225 * writes that have some arbitrary effect.
226 *
227 * The @show function is called to extract the readable content via the
228 * seq_file interface.
229 *
230 * The @write function is called with the data copied into a kernel space
231 * scratch buffer and has a NUL appended for convenience. The buffer may be
232 * modified by the @write function. @write should return 0 on success.
233 *
234 * The @data value is accessible from the @show and @write functions by calling
235 * PDE_DATA() on the file inode. The network namespace must be accessed by
236 * calling seq_file_single_net() on the seq_file struct.
237 */
238struct proc_dir_entry *proc_create_net_single_write(const char *name, umode_t mode,
239 struct proc_dir_entry *parent,
240 int (*show)(struct seq_file *, void *),
241 proc_write_t write,
242 void *data)
243{
244 struct proc_dir_entry *p;
245
246 p = proc_create_reg(name, mode, &parent, data);
247 if (!p)
248 return NULL;
249 pde_force_lookup(p);
250 p->proc_ops = &proc_net_single_ops;
251 p->single_show = show;
252 p->write = write;
253 return proc_register(parent, p);
254}
255EXPORT_SYMBOL_GPL(proc_create_net_single_write);
256
257static struct net *get_proc_task_net(struct inode *dir)
258{
259 struct task_struct *task;
260 struct nsproxy *ns;
261 struct net *net = NULL;
262
263 rcu_read_lock();
264 task = pid_task(proc_pid(dir), PIDTYPE_PID);
265 if (task != NULL) {
266 task_lock(task);
267 ns = task->nsproxy;
268 if (ns != NULL)
269 net = get_net(ns->net_ns);
270 task_unlock(task);
271 }
272 rcu_read_unlock();
273
274 return net;
275}
276
277static struct dentry *proc_tgid_net_lookup(struct inode *dir,
278 struct dentry *dentry, unsigned int flags)
279{
280 struct dentry *de;
281 struct net *net;
282
283 de = ERR_PTR(-ENOENT);
284 net = get_proc_task_net(dir);
285 if (net != NULL) {
286 de = proc_lookup_de(dir, dentry, net->proc_net);
287 put_net(net);
288 }
289 return de;
290}
291
292static int proc_tgid_net_getattr(struct user_namespace *mnt_userns,
293 const struct path *path, struct kstat *stat,
294 u32 request_mask, unsigned int query_flags)
295{
296 struct inode *inode = d_inode(path->dentry);
297 struct net *net;
298
299 net = get_proc_task_net(inode);
300
301 generic_fillattr(&init_user_ns, inode, stat);
302
303 if (net != NULL) {
304 stat->nlink = net->proc_net->nlink;
305 put_net(net);
306 }
307
308 return 0;
309}
310
311const struct inode_operations proc_net_inode_operations = {
312 .lookup = proc_tgid_net_lookup,
313 .getattr = proc_tgid_net_getattr,
314};
315
316static int proc_tgid_net_readdir(struct file *file, struct dir_context *ctx)
317{
318 int ret;
319 struct net *net;
320
321 ret = -EINVAL;
322 net = get_proc_task_net(file_inode(file));
323 if (net != NULL) {
324 ret = proc_readdir_de(file, ctx, net->proc_net);
325 put_net(net);
326 }
327 return ret;
328}
329
330const struct file_operations proc_net_operations = {
331 .llseek = generic_file_llseek,
332 .read = generic_read_dir,
333 .iterate_shared = proc_tgid_net_readdir,
334};
335
336static __net_init int proc_net_ns_init(struct net *net)
337{
338 struct proc_dir_entry *netd, *net_statd;
339 kuid_t uid;
340 kgid_t gid;
341 int err;
342
343 err = -ENOMEM;
344 netd = kmem_cache_zalloc(proc_dir_entry_cache, GFP_KERNEL);
345 if (!netd)
346 goto out;
347
348 netd->subdir = RB_ROOT;
349 netd->data = net;
350 netd->nlink = 2;
351 netd->namelen = 3;
352 netd->parent = &proc_root;
353 netd->name = netd->inline_name;
354 memcpy(netd->name, "net", 4);
355
356 uid = make_kuid(net->user_ns, 0);
357 if (!uid_valid(uid))
358 uid = netd->uid;
359
360 gid = make_kgid(net->user_ns, 0);
361 if (!gid_valid(gid))
362 gid = netd->gid;
363
364 proc_set_user(netd, uid, gid);
365
366 err = -EEXIST;
367 net_statd = proc_net_mkdir(net, "stat", netd);
368 if (!net_statd)
369 goto free_net;
370
371 net->proc_net = netd;
372 net->proc_net_stat = net_statd;
373 return 0;
374
375free_net:
376 pde_free(netd);
377out:
378 return err;
379}
380
381static __net_exit void proc_net_ns_exit(struct net *net)
382{
383 remove_proc_entry("stat", net->proc_net);
384 pde_free(net->proc_net);
385}
386
387static struct pernet_operations __net_initdata proc_net_ns_ops = {
388 .init = proc_net_ns_init,
389 .exit = proc_net_ns_exit,
390};
391
392int __init proc_net_init(void)
393{
394 proc_symlink("net", NULL, "self/net");
395
396 return register_pernet_subsys(&proc_net_ns_ops);
397}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/fs/proc/net.c
4 *
5 * Copyright (C) 2007
6 *
7 * Author: Eric Biederman <ebiederm@xmission.com>
8 *
9 * proc net directory handling functions
10 */
11#include <linux/errno.h>
12#include <linux/time.h>
13#include <linux/proc_fs.h>
14#include <linux/stat.h>
15#include <linux/slab.h>
16#include <linux/init.h>
17#include <linux/sched.h>
18#include <linux/sched/task.h>
19#include <linux/module.h>
20#include <linux/bitops.h>
21#include <linux/mount.h>
22#include <linux/nsproxy.h>
23#include <linux/uidgid.h>
24#include <net/net_namespace.h>
25#include <linux/seq_file.h>
26
27#include "internal.h"
28
29static inline struct net *PDE_NET(struct proc_dir_entry *pde)
30{
31 return pde->parent->data;
32}
33
34static struct net *get_proc_net(const struct inode *inode)
35{
36 return maybe_get_net(PDE_NET(PDE(inode)));
37}
38
39static int seq_open_net(struct inode *inode, struct file *file)
40{
41 unsigned int state_size = PDE(inode)->state_size;
42 struct seq_net_private *p;
43 struct net *net;
44
45 WARN_ON_ONCE(state_size < sizeof(*p));
46
47 if (file->f_mode & FMODE_WRITE && !PDE(inode)->write)
48 return -EACCES;
49
50 net = get_proc_net(inode);
51 if (!net)
52 return -ENXIO;
53
54 p = __seq_open_private(file, PDE(inode)->seq_ops, state_size);
55 if (!p) {
56 put_net(net);
57 return -ENOMEM;
58 }
59#ifdef CONFIG_NET_NS
60 p->net = net;
61 netns_tracker_alloc(net, &p->ns_tracker, GFP_KERNEL);
62#endif
63 return 0;
64}
65
66static void seq_file_net_put_net(struct seq_file *seq)
67{
68#ifdef CONFIG_NET_NS
69 struct seq_net_private *priv = seq->private;
70
71 put_net_track(priv->net, &priv->ns_tracker);
72#else
73 put_net(&init_net);
74#endif
75}
76
77static int seq_release_net(struct inode *ino, struct file *f)
78{
79 struct seq_file *seq = f->private_data;
80
81 seq_file_net_put_net(seq);
82 seq_release_private(ino, f);
83 return 0;
84}
85
86static const struct proc_ops proc_net_seq_ops = {
87 .proc_open = seq_open_net,
88 .proc_read = seq_read,
89 .proc_write = proc_simple_write,
90 .proc_lseek = seq_lseek,
91 .proc_release = seq_release_net,
92};
93
94int bpf_iter_init_seq_net(void *priv_data, struct bpf_iter_aux_info *aux)
95{
96#ifdef CONFIG_NET_NS
97 struct seq_net_private *p = priv_data;
98
99 p->net = get_net_track(current->nsproxy->net_ns, &p->ns_tracker,
100 GFP_KERNEL);
101#endif
102 return 0;
103}
104
105void bpf_iter_fini_seq_net(void *priv_data)
106{
107#ifdef CONFIG_NET_NS
108 struct seq_net_private *p = priv_data;
109
110 put_net_track(p->net, &p->ns_tracker);
111#endif
112}
113
114struct proc_dir_entry *proc_create_net_data(const char *name, umode_t mode,
115 struct proc_dir_entry *parent, const struct seq_operations *ops,
116 unsigned int state_size, void *data)
117{
118 struct proc_dir_entry *p;
119
120 p = proc_create_reg(name, mode, &parent, data);
121 if (!p)
122 return NULL;
123 pde_force_lookup(p);
124 p->proc_ops = &proc_net_seq_ops;
125 p->seq_ops = ops;
126 p->state_size = state_size;
127 return proc_register(parent, p);
128}
129EXPORT_SYMBOL_GPL(proc_create_net_data);
130
131/**
132 * proc_create_net_data_write - Create a writable net_ns-specific proc file
133 * @name: The name of the file.
134 * @mode: The file's access mode.
135 * @parent: The parent directory in which to create.
136 * @ops: The seq_file ops with which to read the file.
137 * @write: The write method with which to 'modify' the file.
138 * @data: Data for retrieval by pde_data().
139 *
140 * Create a network namespaced proc file in the @parent directory with the
141 * specified @name and @mode that allows reading of a file that displays a
142 * series of elements and also provides for the file accepting writes that have
143 * some arbitrary effect.
144 *
145 * The functions in the @ops table are used to iterate over items to be
146 * presented and extract the readable content using the seq_file interface.
147 *
148 * The @write function is called with the data copied into a kernel space
149 * scratch buffer and has a NUL appended for convenience. The buffer may be
150 * modified by the @write function. @write should return 0 on success.
151 *
152 * The @data value is accessible from the @show and @write functions by calling
153 * pde_data() on the file inode. The network namespace must be accessed by
154 * calling seq_file_net() on the seq_file struct.
155 */
156struct proc_dir_entry *proc_create_net_data_write(const char *name, umode_t mode,
157 struct proc_dir_entry *parent,
158 const struct seq_operations *ops,
159 proc_write_t write,
160 unsigned int state_size, void *data)
161{
162 struct proc_dir_entry *p;
163
164 p = proc_create_reg(name, mode, &parent, data);
165 if (!p)
166 return NULL;
167 pde_force_lookup(p);
168 p->proc_ops = &proc_net_seq_ops;
169 p->seq_ops = ops;
170 p->state_size = state_size;
171 p->write = write;
172 return proc_register(parent, p);
173}
174EXPORT_SYMBOL_GPL(proc_create_net_data_write);
175
176static int single_open_net(struct inode *inode, struct file *file)
177{
178 struct proc_dir_entry *de = PDE(inode);
179 struct net *net;
180 int err;
181
182 net = get_proc_net(inode);
183 if (!net)
184 return -ENXIO;
185
186 err = single_open(file, de->single_show, net);
187 if (err)
188 put_net(net);
189 return err;
190}
191
192static int single_release_net(struct inode *ino, struct file *f)
193{
194 struct seq_file *seq = f->private_data;
195 put_net(seq->private);
196 return single_release(ino, f);
197}
198
199static const struct proc_ops proc_net_single_ops = {
200 .proc_open = single_open_net,
201 .proc_read = seq_read,
202 .proc_write = proc_simple_write,
203 .proc_lseek = seq_lseek,
204 .proc_release = single_release_net,
205};
206
207struct proc_dir_entry *proc_create_net_single(const char *name, umode_t mode,
208 struct proc_dir_entry *parent,
209 int (*show)(struct seq_file *, void *), void *data)
210{
211 struct proc_dir_entry *p;
212
213 p = proc_create_reg(name, mode, &parent, data);
214 if (!p)
215 return NULL;
216 pde_force_lookup(p);
217 p->proc_ops = &proc_net_single_ops;
218 p->single_show = show;
219 return proc_register(parent, p);
220}
221EXPORT_SYMBOL_GPL(proc_create_net_single);
222
223/**
224 * proc_create_net_single_write - Create a writable net_ns-specific proc file
225 * @name: The name of the file.
226 * @mode: The file's access mode.
227 * @parent: The parent directory in which to create.
228 * @show: The seqfile show method with which to read the file.
229 * @write: The write method with which to 'modify' the file.
230 * @data: Data for retrieval by pde_data().
231 *
232 * Create a network-namespaced proc file in the @parent directory with the
233 * specified @name and @mode that allows reading of a file that displays a
234 * single element rather than a series and also provides for the file accepting
235 * writes that have some arbitrary effect.
236 *
237 * The @show function is called to extract the readable content via the
238 * seq_file interface.
239 *
240 * The @write function is called with the data copied into a kernel space
241 * scratch buffer and has a NUL appended for convenience. The buffer may be
242 * modified by the @write function. @write should return 0 on success.
243 *
244 * The @data value is accessible from the @show and @write functions by calling
245 * pde_data() on the file inode. The network namespace must be accessed by
246 * calling seq_file_single_net() on the seq_file struct.
247 */
248struct proc_dir_entry *proc_create_net_single_write(const char *name, umode_t mode,
249 struct proc_dir_entry *parent,
250 int (*show)(struct seq_file *, void *),
251 proc_write_t write,
252 void *data)
253{
254 struct proc_dir_entry *p;
255
256 p = proc_create_reg(name, mode, &parent, data);
257 if (!p)
258 return NULL;
259 pde_force_lookup(p);
260 p->proc_ops = &proc_net_single_ops;
261 p->single_show = show;
262 p->write = write;
263 return proc_register(parent, p);
264}
265EXPORT_SYMBOL_GPL(proc_create_net_single_write);
266
267static struct net *get_proc_task_net(struct inode *dir)
268{
269 struct task_struct *task;
270 struct nsproxy *ns;
271 struct net *net = NULL;
272
273 rcu_read_lock();
274 task = pid_task(proc_pid(dir), PIDTYPE_PID);
275 if (task != NULL) {
276 task_lock(task);
277 ns = task->nsproxy;
278 if (ns != NULL)
279 net = get_net(ns->net_ns);
280 task_unlock(task);
281 }
282 rcu_read_unlock();
283
284 return net;
285}
286
287static struct dentry *proc_tgid_net_lookup(struct inode *dir,
288 struct dentry *dentry, unsigned int flags)
289{
290 struct dentry *de;
291 struct net *net;
292
293 de = ERR_PTR(-ENOENT);
294 net = get_proc_task_net(dir);
295 if (net != NULL) {
296 de = proc_lookup_de(dir, dentry, net->proc_net);
297 put_net(net);
298 }
299 return de;
300}
301
302static int proc_tgid_net_getattr(struct user_namespace *mnt_userns,
303 const struct path *path, struct kstat *stat,
304 u32 request_mask, unsigned int query_flags)
305{
306 struct inode *inode = d_inode(path->dentry);
307 struct net *net;
308
309 net = get_proc_task_net(inode);
310
311 generic_fillattr(&init_user_ns, inode, stat);
312
313 if (net != NULL) {
314 stat->nlink = net->proc_net->nlink;
315 put_net(net);
316 }
317
318 return 0;
319}
320
321const struct inode_operations proc_net_inode_operations = {
322 .lookup = proc_tgid_net_lookup,
323 .getattr = proc_tgid_net_getattr,
324};
325
326static int proc_tgid_net_readdir(struct file *file, struct dir_context *ctx)
327{
328 int ret;
329 struct net *net;
330
331 ret = -EINVAL;
332 net = get_proc_task_net(file_inode(file));
333 if (net != NULL) {
334 ret = proc_readdir_de(file, ctx, net->proc_net);
335 put_net(net);
336 }
337 return ret;
338}
339
340const struct file_operations proc_net_operations = {
341 .llseek = generic_file_llseek,
342 .read = generic_read_dir,
343 .iterate_shared = proc_tgid_net_readdir,
344};
345
346static __net_init int proc_net_ns_init(struct net *net)
347{
348 struct proc_dir_entry *netd, *net_statd;
349 kuid_t uid;
350 kgid_t gid;
351 int err;
352
353 /*
354 * This PDE acts only as an anchor for /proc/${pid}/net hierarchy.
355 * Corresponding inode (PDE(inode) == net->proc_net) is never
356 * instantiated therefore blanket zeroing is fine.
357 * net->proc_net_stat inode is instantiated normally.
358 */
359 err = -ENOMEM;
360 netd = kmem_cache_zalloc(proc_dir_entry_cache, GFP_KERNEL);
361 if (!netd)
362 goto out;
363
364 netd->subdir = RB_ROOT;
365 netd->data = net;
366 netd->nlink = 2;
367 netd->namelen = 3;
368 netd->parent = &proc_root;
369 netd->name = netd->inline_name;
370 memcpy(netd->name, "net", 4);
371
372 uid = make_kuid(net->user_ns, 0);
373 if (!uid_valid(uid))
374 uid = netd->uid;
375
376 gid = make_kgid(net->user_ns, 0);
377 if (!gid_valid(gid))
378 gid = netd->gid;
379
380 proc_set_user(netd, uid, gid);
381
382 /* Seed dentry revalidation for /proc/${pid}/net */
383 pde_force_lookup(netd);
384
385 err = -EEXIST;
386 net_statd = proc_net_mkdir(net, "stat", netd);
387 if (!net_statd)
388 goto free_net;
389
390 net->proc_net = netd;
391 net->proc_net_stat = net_statd;
392 return 0;
393
394free_net:
395 pde_free(netd);
396out:
397 return err;
398}
399
400static __net_exit void proc_net_ns_exit(struct net *net)
401{
402 remove_proc_entry("stat", net->proc_net);
403 pde_free(net->proc_net);
404}
405
406static struct pernet_operations __net_initdata proc_net_ns_ops = {
407 .init = proc_net_ns_init,
408 .exit = proc_net_ns_exit,
409};
410
411int __init proc_net_init(void)
412{
413 proc_symlink("net", NULL, "self/net");
414
415 return register_pernet_subsys(&proc_net_ns_ops);
416}