[linux-block.git] / fs / proc / proc_net.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/fs/proc/net.c
 *
 *  Copyright (C) 2007
 *
 *  Author: Eric Biederman <ebiederm@xmission.com>
 *
 *  proc net directory handling functions
 */

#include <linux/uaccess.h>

#include <linux/errno.h>
#include <linux/time.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/sched/task.h>
#include <linux/module.h>
#include <linux/bitops.h>
#include <linux/mount.h>
#include <linux/nsproxy.h>
#include <linux/uidgid.h>
#include <net/net_namespace.h>
#include <linux/seq_file.h>

#include "internal.h"

static inline struct net *PDE_NET(struct proc_dir_entry *pde)
{
	return pde->parent->data;
}

static struct net *get_proc_net(const struct inode *inode)
{
	return maybe_get_net(PDE_NET(PDE(inode)));
}

static int seq_open_net(struct inode *inode, struct file *file)
{
	unsigned int state_size = PDE(inode)->state_size;
	struct seq_net_private *p;
	struct net *net;

	WARN_ON_ONCE(state_size < sizeof(*p));

	if (file->f_mode & FMODE_WRITE && !PDE(inode)->write)
		return -EACCES;

	net = get_proc_net(inode);
	if (!net)
		return -ENXIO;

	p = __seq_open_private(file, PDE(inode)->seq_ops, state_size);
	if (!p) {
		put_net(net);
		return -ENOMEM;
	}
#ifdef CONFIG_NET_NS
	p->net = net;
#endif
	return 0;
}

static int seq_release_net(struct inode *ino, struct file *f)
{
	struct seq_file *seq = f->private_data;

	put_net(seq_file_net(seq));
	seq_release_private(ino, f);
	return 0;
}

static const struct proc_ops proc_net_seq_ops = {
	.proc_open	= seq_open_net,
	.proc_read	= seq_read,
	.proc_write	= proc_simple_write,
	.proc_lseek	= seq_lseek,
	.proc_release	= seq_release_net,
};

int bpf_iter_init_seq_net(void *priv_data, struct bpf_iter_aux_info *aux)
{
#ifdef CONFIG_NET_NS
	struct seq_net_private *p = priv_data;

	p->net = get_net(current->nsproxy->net_ns);
#endif
	return 0;
}

void bpf_iter_fini_seq_net(void *priv_data)
{
#ifdef CONFIG_NET_NS
	struct seq_net_private *p = priv_data;

	put_net(p->net);
#endif
}

struct proc_dir_entry *proc_create_net_data(const char *name, umode_t mode,
		struct proc_dir_entry *parent, const struct seq_operations *ops,
		unsigned int state_size, void *data)
{
	struct proc_dir_entry *p;

	p = proc_create_reg(name, mode, &parent, data);
	if (!p)
		return NULL;
	pde_force_lookup(p);
	p->proc_ops = &proc_net_seq_ops;
	p->seq_ops = ops;
	p->state_size = state_size;
	return proc_register(parent, p);
}
EXPORT_SYMBOL_GPL(proc_create_net_data);

/**
 * proc_create_net_data_write - Create a writable net_ns-specific proc file
 * @name: The name of the file.
 * @mode: The file's access mode.
 * @parent: The parent directory in which to create.
 * @ops: The seq_file ops with which to read the file.
 * @write: The write method with which to 'modify' the file.
 * @data: Data for retrieval by PDE_DATA().
 *
 * Create a network namespaced proc file in the @parent directory with the
 * specified @name and @mode that allows reading of a file that displays a
 * series of elements and also provides for the file accepting writes that have
 * some arbitrary effect.
 *
 * The functions in the @ops table are used to iterate over items to be
 * presented and extract the readable content using the seq_file interface.
 *
 * The @write function is called with the data copied into a kernel space
 * scratch buffer and has a NUL appended for convenience.  The buffer may be
 * modified by the @write function.  @write should return 0 on success.
 *
 * The @data value is accessible from the @show and @write functions by calling
 * PDE_DATA() on the file inode.  The network namespace must be accessed by
 * calling seq_file_net() on the seq_file struct.
 */
struct proc_dir_entry *proc_create_net_data_write(const char *name, umode_t mode,
						  struct proc_dir_entry *parent,
						  const struct seq_operations *ops,
						  proc_write_t write,
						  unsigned int state_size, void *data)
{
	struct proc_dir_entry *p;

	p = proc_create_reg(name, mode, &parent, data);
	if (!p)
		return NULL;
	pde_force_lookup(p);
	p->proc_ops = &proc_net_seq_ops;
	p->seq_ops = ops;
	p->state_size = state_size;
	p->write = write;
	return proc_register(parent, p);
}
EXPORT_SYMBOL_GPL(proc_create_net_data_write);

static int single_open_net(struct inode *inode, struct file *file)
{
	struct proc_dir_entry *de = PDE(inode);
	struct net *net;
	int err;

	net = get_proc_net(inode);
	if (!net)
		return -ENXIO;

	err = single_open(file, de->single_show, net);
	if (err)
		put_net(net);
	return err;
}

static int single_release_net(struct inode *ino, struct file *f)
{
	struct seq_file *seq = f->private_data;
	put_net(seq->private);
	return single_release(ino, f);
}

static const struct proc_ops proc_net_single_ops = {
	.proc_open	= single_open_net,
	.proc_read	= seq_read,
	.proc_write	= proc_simple_write,
	.proc_lseek	= seq_lseek,
	.proc_release	= single_release_net,
};

struct proc_dir_entry *proc_create_net_single(const char *name, umode_t mode,
		struct proc_dir_entry *parent,
		int (*show)(struct seq_file *, void *), void *data)
{
	struct proc_dir_entry *p;

	p = proc_create_reg(name, mode, &parent, data);
	if (!p)
		return NULL;
	pde_force_lookup(p);
	p->proc_ops = &proc_net_single_ops;
	p->single_show = show;
	return proc_register(parent, p);
}
EXPORT_SYMBOL_GPL(proc_create_net_single);

/**
 * proc_create_net_single_write - Create a writable net_ns-specific proc file
 * @name: The name of the file.
 * @mode: The file's access mode.
 * @parent: The parent directory in which to create.
 * @show: The seqfile show method with which to read the file.
 * @write: The write method with which to 'modify' the file.
 * @data: Data for retrieval by PDE_DATA().
 *
 * Create a network-namespaced proc file in the @parent directory with the
 * specified @name and @mode that allows reading of a file that displays a
 * single element rather than a series and also provides for the file accepting
 * writes that have some arbitrary effect.
 *
 * The @show function is called to extract the readable content via the
 * seq_file interface.
 *
 * The @write function is called with the data copied into a kernel space
 * scratch buffer and has a NUL appended for convenience.  The buffer may be
 * modified by the @write function.  @write should return 0 on success.
 *
 * The @data value is accessible from the @show and @write functions by calling
 * PDE_DATA() on the file inode.  The network namespace must be accessed by
 * calling seq_file_single_net() on the seq_file struct.
 */
struct proc_dir_entry *proc_create_net_single_write(const char *name, umode_t mode,
						    struct proc_dir_entry *parent,
						    int (*show)(struct seq_file *, void *),
						    proc_write_t write,
						    void *data)
{
	struct proc_dir_entry *p;

	p = proc_create_reg(name, mode, &parent, data);
	if (!p)
		return NULL;
	pde_force_lookup(p);
	p->proc_ops = &proc_net_single_ops;
	p->single_show = show;
	p->write = write;
	return proc_register(parent, p);
}
EXPORT_SYMBOL_GPL(proc_create_net_single_write);

static struct net *get_proc_task_net(struct inode *dir)
{
	struct task_struct *task;
	struct nsproxy *ns;
	struct net *net = NULL;

	rcu_read_lock();
	task = pid_task(proc_pid(dir), PIDTYPE_PID);
	if (task != NULL) {
		task_lock(task);
		ns = task->nsproxy;
		if (ns != NULL)
			net = get_net(ns->net_ns);
		task_unlock(task);
	}
	rcu_read_unlock();

	return net;
}

static struct dentry *proc_tgid_net_lookup(struct inode *dir,
		struct dentry *dentry, unsigned int flags)
{
	struct dentry *de;
	struct net *net;

	de = ERR_PTR(-ENOENT);
	net = get_proc_task_net(dir);
	if (net != NULL) {
		de = proc_lookup_de(dir, dentry, net->proc_net);
		put_net(net);
	}
	return de;
}

static int proc_tgid_net_getattr(const struct path *path, struct kstat *stat,
				 u32 request_mask, unsigned int query_flags)
{
	struct inode *inode = d_inode(path->dentry);
	struct net *net;

	net = get_proc_task_net(inode);

	generic_fillattr(&init_user_ns, inode, stat);

	if (net != NULL) {
		stat->nlink = net->proc_net->nlink;
		put_net(net);
	}

	return 0;
}

const struct inode_operations proc_net_inode_operations = {
	.lookup		= proc_tgid_net_lookup,
	.getattr	= proc_tgid_net_getattr,
};

static int proc_tgid_net_readdir(struct file *file, struct dir_context *ctx)
{
	int ret;
	struct net *net;

	ret = -EINVAL;
	net = get_proc_task_net(file_inode(file));
	if (net != NULL) {
		ret = proc_readdir_de(file, ctx, net->proc_net);
		put_net(net);
	}
	return ret;
}

const struct file_operations proc_net_operations = {
	.llseek		= generic_file_llseek,
	.read		= generic_read_dir,
	.iterate_shared	= proc_tgid_net_readdir,
};

static __net_init int proc_net_ns_init(struct net *net)
{
	struct proc_dir_entry *netd, *net_statd;
	kuid_t uid;
	kgid_t gid;
	int err;

	err = -ENOMEM;
	netd = kmem_cache_zalloc(proc_dir_entry_cache, GFP_KERNEL);
	if (!netd)
		goto out;

	netd->subdir = RB_ROOT;
	netd->data = net;
	netd->nlink = 2;
	netd->namelen = 3;
	netd->parent = &proc_root;
	netd->name = netd->inline_name;
	memcpy(netd->name, "net", 4);

	uid = make_kuid(net->user_ns, 0);
	if (!uid_valid(uid))
		uid = netd->uid;

	gid = make_kgid(net->user_ns, 0);
	if (!gid_valid(gid))
		gid = netd->gid;

	proc_set_user(netd, uid, gid);

	err = -EEXIST;
	net_statd = proc_net_mkdir(net, "stat", netd);
	if (!net_statd)
		goto free_net;

	net->proc_net = netd;
	net->proc_net_stat = net_statd;
	return 0;

free_net:
	pde_free(netd);
out:
	return err;
}

static __net_exit void proc_net_ns_exit(struct net *net)
{
	remove_proc_entry("stat", net->proc_net);
	pde_free(net->proc_net);
}

static struct pernet_operations __net_initdata proc_net_ns_ops = {
	.init = proc_net_ns_init,
	.exit = proc_net_ns_exit,
};

int __init proc_net_init(void)
{
	proc_symlink("net", NULL, "self/net");

	return register_pernet_subsys(&proc_net_ns_ops);
}
Commit	Line	Data
457c8996	1	// SPDX-License-Identifier: GPL-2.0-only
3c12afe7 DM	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
7c0f6ba6	12	#include <linux/uaccess.h>
3c12afe7 DM	13
	14	#include <linux/errno.h>
	15	#include <linux/time.h>
	16	#include <linux/proc_fs.h>
	17	#include <linux/stat.h>
5a0e3ad6	18	#include <linux/slab.h>
3c12afe7 DM	19	#include <linux/init.h>
3c12afe7 DM	20	#include <linux/sched.h>
f719ff9b	21	#include <linux/sched/task.h>
3c12afe7 DM	22	#include <linux/module.h>
3c12afe7 DM	23	#include <linux/bitops.h>
3c12afe7 DM	24	#include <linux/mount.h>
3c12afe7 DM	25	#include <linux/nsproxy.h>
c110486f	26	#include <linux/uidgid.h>
3c12afe7	27	#include <net/net_namespace.h>
e372c414	28	#include <linux/seq_file.h>
3c12afe7 DM	29
	30	#include "internal.h"
	31
4abfd029 DH	32	static inline struct net PDE_NET(struct proc_dir_entry pde)
	33	{
	34	return pde->parent->data;
	35	}
3c12afe7	36
8086cd45 AB	37	static struct net get_proc_net(const struct inode inode)
	38	{
	39	return maybe_get_net(PDE_NET(PDE(inode)));
	40	}
	41
c3506372	42	static int seq_open_net(struct inode inode, struct file file)
e372c414	43	{
c3506372	44	unsigned int state_size = PDE(inode)->state_size;
e372c414	45	struct seq_net_private *p;
c3506372	46	struct net *net;
e372c414	47
c3506372	48	WARN_ON_ONCE(state_size < sizeof(*p));
e372c414	49
564def71 DH	50	if (file->f_mode & FMODE_WRITE && !PDE(inode)->write)
	51	return -EACCES;
	52
c3506372 CH	53	net = get_proc_net(inode);
c3506372 CH	54	if (!net)
e372c414 DL	55	return -ENXIO;
e372c414 DL	56
c3506372 CH	57	p = __seq_open_private(file, PDE(inode)->seq_ops, state_size);
c3506372 CH	58	if (!p) {
e372c414 DL	59	put_net(net);
	60	return -ENOMEM;
	61	}
1218854a	62	#ifdef CONFIG_NET_NS
e372c414	63	p->net = net;
1218854a	64	#endif
e372c414 DL	65	return 0;
e372c414 DL	66	}
c3506372 CH	67
	68	static 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
d56c0d45 AD	77	static 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,
c3506372 CH	83	};
c3506372 CH	84
f9c79272	85	int bpf_iter_init_seq_net(void priv_data, struct bpf_iter_aux_info aux)
138d0be3 YS	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
	95	void 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
c3506372 CH	104	struct 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;
1fde6f21	113	pde_force_lookup(p);
d56c0d45	114	p->proc_ops = &proc_net_seq_ops;
c3506372 CH	115	p->seq_ops = ops;
	116	p->state_size = state_size;
	117	return proc_register(parent, p);
	118	}
	119	EXPORT_SYMBOL_GPL(proc_create_net_data);
e372c414	120
564def71 DH	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.
d2928e85	127	* @write: The write method with which to 'modify' the file.
564def71 DH	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	*/
	146	struct 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;
1fde6f21	157	pde_force_lookup(p);
d56c0d45	158	p->proc_ops = &proc_net_seq_ops;
564def71 DH	159	p->seq_ops = ops;
	160	p->state_size = state_size;
	161	p->write = write;
	162	return proc_register(parent, p);
	163	}
	164	EXPORT_SYMBOL_GPL(proc_create_net_data_write);
	165
3617d949	166	static int single_open_net(struct inode inode, struct file file)
de05c557	167	{
3617d949	168	struct proc_dir_entry *de = PDE(inode);
de05c557	169	struct net *net;
3617d949	170	int err;
de05c557	171
de05c557	172	net = get_proc_net(inode);
3617d949 CH	173	if (!net)
3617d949 CH	174	return -ENXIO;
de05c557	175
3617d949 CH	176	err = single_open(file, de->single_show, net);
	177	if (err)
	178	put_net(net);
de05c557 PE	179	return err;
de05c557 PE	180	}
de05c557	181
3617d949	182	static int single_release_net(struct inode ino, struct file f)
b6fcbdb4 PE	183	{
	184	struct seq_file *seq = f->private_data;
	185	put_net(seq->private);
	186	return single_release(ino, f);
	187	}
3617d949	188
d56c0d45 AD	189	static 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,
3617d949 CH	195	};
	196
	197	struct 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;
1fde6f21	206	pde_force_lookup(p);
d56c0d45	207	p->proc_ops = &proc_net_single_ops;
3617d949 CH	208	p->single_show = show;
	209	return proc_register(parent, p);
	210	}
	211	EXPORT_SYMBOL_GPL(proc_create_net_single);
b6fcbdb4	212
564def71 DH	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.
d2928e85	219	* @write: The write method with which to 'modify' the file.
564def71 DH	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	*/
	238	struct 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;
1fde6f21	249	pde_force_lookup(p);
d56c0d45	250	p->proc_ops = &proc_net_single_ops;
564def71 DH	251	p->single_show = show;
	252	p->write = write;
	253	return proc_register(parent, p);
	254	}
	255	EXPORT_SYMBOL_GPL(proc_create_net_single_write);
	256
e9720acd PE	257	static 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) {
728dba3a EB	266	task_lock(task);
728dba3a EB	267	ns = task->nsproxy;
e9720acd PE	268	if (ns != NULL)
e9720acd PE	269	net = get_net(ns->net_ns);
728dba3a	270	task_unlock(task);
e9720acd PE	271	}
	272	rcu_read_unlock();
	273
	274	return net;
	275	}
	276
	277	static struct dentry proc_tgid_net_lookup(struct inode dir,
00cd8dd3	278	struct dentry *dentry, unsigned int flags)
e9720acd PE	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) {
93ad5bc6	286	de = proc_lookup_de(dir, dentry, net->proc_net);
e9720acd PE	287	put_net(net);
	288	}
	289	return de;
	290	}
	291
a528d35e DH	292	static int proc_tgid_net_getattr(const struct path path, struct kstat stat,
a528d35e DH	293	u32 request_mask, unsigned int query_flags)
e9720acd	294	{
a528d35e	295	struct inode *inode = d_inode(path->dentry);
e9720acd PE	296	struct net *net;
	297
	298	net = get_proc_task_net(inode);
	299
0d56a451	300	generic_fillattr(&init_user_ns, inode, stat);
e9720acd PE	301
	302	if (net != NULL) {
	303	stat->nlink = net->proc_net->nlink;
	304	put_net(net);
	305	}
	306
	307	return 0;
	308	}
	309
	310	const struct inode_operations proc_net_inode_operations = {
	311	.lookup = proc_tgid_net_lookup,
	312	.getattr = proc_tgid_net_getattr,
	313	};
	314
f0c3b509	315	static int proc_tgid_net_readdir(struct file file, struct dir_context ctx)
e9720acd PE	316	{
	317	int ret;
	318	struct net *net;
	319
	320	ret = -EINVAL;
f0c3b509	321	net = get_proc_task_net(file_inode(file));
e9720acd	322	if (net != NULL) {
93ad5bc6	323	ret = proc_readdir_de(file, ctx, net->proc_net);
e9720acd PE	324	put_net(net);
	325	}
	326	return ret;
	327	}
	328
	329	const struct file_operations proc_net_operations = {
b4df2b92	330	.llseek = generic_file_llseek,
e9720acd	331	.read = generic_read_dir,
f50752ea	332	.iterate_shared = proc_tgid_net_readdir,
e9720acd PE	333	};
e9720acd PE	334
4665079c	335	static __net_init int proc_net_ns_init(struct net *net)
3c12afe7	336	{
e9720acd	337	struct proc_dir_entry netd, net_statd;
c110486f DT	338	kuid_t uid;
c110486f DT	339	kgid_t gid;
3c12afe7 DM	340	int err;
	341
	342	err = -ENOMEM;
b4884f23	343	netd = kmem_cache_zalloc(proc_dir_entry_cache, GFP_KERNEL);
e9720acd	344	if (!netd)
3c12afe7 DM	345	goto out;
3c12afe7 DM	346
4f113437	347	netd->subdir = RB_ROOT;
e9720acd PE	348	netd->data = net;
e9720acd PE	349	netd->nlink = 2;
e9720acd PE	350	netd->namelen = 3;
e9720acd PE	351	netd->parent = &proc_root;
b4884f23	352	netd->name = netd->inline_name;
09570f91	353	memcpy(netd->name, "net", 4);
3c12afe7	354
c110486f DT	355	uid = make_kuid(net->user_ns, 0);
	356	if (!uid_valid(uid))
	357	uid = netd->uid;
	358
	359	gid = make_kgid(net->user_ns, 0);
	360	if (!gid_valid(gid))
	361	gid = netd->gid;
	362
	363	proc_set_user(netd, uid, gid);
	364
3c12afe7	365	err = -EEXIST;
e5d69b9f	366	net_statd = proc_net_mkdir(net, "stat", netd);
3c12afe7 DM	367	if (!net_statd)
	368	goto free_net;
	369
3c12afe7 DM	370	net->proc_net = netd;
3c12afe7 DM	371	net->proc_net_stat = net_statd;
e9720acd	372	return 0;
3c12afe7	373
e9720acd	374	free_net:
b4884f23	375	pde_free(netd);
3c12afe7 DM	376	out:
3c12afe7 DM	377	return err;
3c12afe7 DM	378	}
3c12afe7 DM	379
4665079c	380	static __net_exit void proc_net_ns_exit(struct net *net)
3c12afe7 DM	381	{
3c12afe7 DM	382	remove_proc_entry("stat", net->proc_net);
b4884f23	383	pde_free(net->proc_net);
3c12afe7 DM	384	}
3c12afe7 DM	385
022cbae6	386	static struct pernet_operations __net_initdata proc_net_ns_ops = {
3c12afe7 DM	387	.init = proc_net_ns_init,
	388	.exit = proc_net_ns_exit,
	389	};
	390
4665079c	391	int __init proc_net_init(void)
3c12afe7	392	{
155134fe	393	proc_symlink("net", NULL, "self/net");
3c12afe7 DM	394
	395	return register_pernet_subsys(&proc_net_ns_ops);
	396	}