[thirdparty/linux.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 proc_net_d_revalidate(struct dentry *dentry, unsigned int flags)
{
	return 0;
}

static const struct dentry_operations proc_net_dentry_ops = {
	.d_revalidate	= proc_net_d_revalidate,
	.d_delete	= always_delete_dentry,
};

static void pde_force_lookup(struct proc_dir_entry *pde)
{
	/* /proc/net/ entries can be changed under us by setns(CLONE_NEWNET) */
	pde->proc_dops = &proc_net_dentry_ops;
}

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,
};

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 which 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 which 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(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
1fde6f21 AD	42	static int proc_net_d_revalidate(struct dentry *dentry, unsigned int flags)
	43	{
	44	return 0;
	45	}
	46
	47	static const struct dentry_operations proc_net_dentry_ops = {
	48	.d_revalidate = proc_net_d_revalidate,
	49	.d_delete = always_delete_dentry,
	50	};
	51
	52	static void pde_force_lookup(struct proc_dir_entry *pde)
	53	{
	54	/* /proc/net/ entries can be changed under us by setns(CLONE_NEWNET) */
	55	pde->proc_dops = &proc_net_dentry_ops;
	56	}
	57
c3506372	58	static int seq_open_net(struct inode inode, struct file file)
e372c414	59	{
c3506372	60	unsigned int state_size = PDE(inode)->state_size;
e372c414	61	struct seq_net_private *p;
c3506372	62	struct net *net;
e372c414	63
c3506372	64	WARN_ON_ONCE(state_size < sizeof(*p));
e372c414	65
564def71 DH	66	if (file->f_mode & FMODE_WRITE && !PDE(inode)->write)
	67	return -EACCES;
	68
c3506372 CH	69	net = get_proc_net(inode);
c3506372 CH	70	if (!net)
e372c414 DL	71	return -ENXIO;
e372c414 DL	72
c3506372 CH	73	p = __seq_open_private(file, PDE(inode)->seq_ops, state_size);
c3506372 CH	74	if (!p) {
e372c414 DL	75	put_net(net);
	76	return -ENOMEM;
	77	}
1218854a	78	#ifdef CONFIG_NET_NS
e372c414	79	p->net = net;
1218854a	80	#endif
e372c414 DL	81	return 0;
e372c414 DL	82	}
c3506372 CH	83
	84	static int seq_release_net(struct inode ino, struct file f)
	85	{
	86	struct seq_file *seq = f->private_data;
	87
	88	put_net(seq_file_net(seq));
	89	seq_release_private(ino, f);
	90	return 0;
	91	}
	92
d56c0d45 AD	93	static const struct proc_ops proc_net_seq_ops = {
	94	.proc_open = seq_open_net,
	95	.proc_read = seq_read,
	96	.proc_write = proc_simple_write,
	97	.proc_lseek = seq_lseek,
	98	.proc_release = seq_release_net,
c3506372 CH	99	};
	100
	101	struct proc_dir_entry proc_create_net_data(const char name, umode_t mode,
	102	struct proc_dir_entry parent, const struct seq_operations ops,
	103	unsigned int state_size, void *data)
	104	{
	105	struct proc_dir_entry *p;
	106
	107	p = proc_create_reg(name, mode, &parent, data);
	108	if (!p)
	109	return NULL;
1fde6f21	110	pde_force_lookup(p);
d56c0d45	111	p->proc_ops = &proc_net_seq_ops;
c3506372 CH	112	p->seq_ops = ops;
	113	p->state_size = state_size;
	114	return proc_register(parent, p);
	115	}
	116	EXPORT_SYMBOL_GPL(proc_create_net_data);
e372c414	117
564def71 DH	118	/**
	119	* proc_create_net_data_write - Create a writable net_ns-specific proc file
	120	* @name: The name of the file.
	121	* @mode: The file's access mode.
	122	* @parent: The parent directory in which to create.
	123	* @ops: The seq_file ops with which to read the file.
	124	* @write: The write method which which to 'modify' the file.
	125	* @data: Data for retrieval by PDE_DATA().
	126	*
	127	* Create a network namespaced proc file in the @parent directory with the
	128	* specified @name and @mode that allows reading of a file that displays a
	129	* series of elements and also provides for the file accepting writes that have
	130	* some arbitrary effect.
	131	*
	132	* The functions in the @ops table are used to iterate over items to be
	133	* presented and extract the readable content using the seq_file interface.
	134	*
	135	* The @write function is called with the data copied into a kernel space
	136	* scratch buffer and has a NUL appended for convenience. The buffer may be
	137	* modified by the @write function. @write should return 0 on success.
	138	*
	139	* The @data value is accessible from the @show and @write functions by calling
	140	* PDE_DATA() on the file inode. The network namespace must be accessed by
	141	* calling seq_file_net() on the seq_file struct.
	142	*/
	143	struct proc_dir_entry proc_create_net_data_write(const char name, umode_t mode,
	144	struct proc_dir_entry *parent,
	145	const struct seq_operations *ops,
	146	proc_write_t write,
	147	unsigned int state_size, void *data)
	148	{
	149	struct proc_dir_entry *p;
	150
	151	p = proc_create_reg(name, mode, &parent, data);
	152	if (!p)
	153	return NULL;
1fde6f21	154	pde_force_lookup(p);
d56c0d45	155	p->proc_ops = &proc_net_seq_ops;
564def71 DH	156	p->seq_ops = ops;
	157	p->state_size = state_size;
	158	p->write = write;
	159	return proc_register(parent, p);
	160	}
	161	EXPORT_SYMBOL_GPL(proc_create_net_data_write);
	162
3617d949	163	static int single_open_net(struct inode inode, struct file file)
de05c557	164	{
3617d949	165	struct proc_dir_entry *de = PDE(inode);
de05c557	166	struct net *net;
3617d949	167	int err;
de05c557	168
de05c557	169	net = get_proc_net(inode);
3617d949 CH	170	if (!net)
3617d949 CH	171	return -ENXIO;
de05c557	172
3617d949 CH	173	err = single_open(file, de->single_show, net);
	174	if (err)
	175	put_net(net);
de05c557 PE	176	return err;
de05c557 PE	177	}
de05c557	178
3617d949	179	static int single_release_net(struct inode ino, struct file f)
b6fcbdb4 PE	180	{
	181	struct seq_file *seq = f->private_data;
	182	put_net(seq->private);
	183	return single_release(ino, f);
	184	}
3617d949	185
d56c0d45 AD	186	static const struct proc_ops proc_net_single_ops = {
	187	.proc_open = single_open_net,
	188	.proc_read = seq_read,
	189	.proc_write = proc_simple_write,
	190	.proc_lseek = seq_lseek,
	191	.proc_release = single_release_net,
3617d949 CH	192	};
	193
	194	struct proc_dir_entry proc_create_net_single(const char name, umode_t mode,
	195	struct proc_dir_entry *parent,
	196	int (show)(struct seq_file , void ), void data)
	197	{
	198	struct proc_dir_entry *p;
	199
	200	p = proc_create_reg(name, mode, &parent, data);
	201	if (!p)
	202	return NULL;
1fde6f21	203	pde_force_lookup(p);
d56c0d45	204	p->proc_ops = &proc_net_single_ops;
3617d949 CH	205	p->single_show = show;
	206	return proc_register(parent, p);
	207	}
	208	EXPORT_SYMBOL_GPL(proc_create_net_single);
b6fcbdb4	209
564def71 DH	210	/**
	211	* proc_create_net_single_write - Create a writable net_ns-specific proc file
	212	* @name: The name of the file.
	213	* @mode: The file's access mode.
	214	* @parent: The parent directory in which to create.
	215	* @show: The seqfile show method with which to read the file.
	216	* @write: The write method which which to 'modify' the file.
	217	* @data: Data for retrieval by PDE_DATA().
	218	*
	219	* Create a network-namespaced proc file in the @parent directory with the
	220	* specified @name and @mode that allows reading of a file that displays a
	221	* single element rather than a series and also provides for the file accepting
	222	* writes that have some arbitrary effect.
	223	*
	224	* The @show function is called to extract the readable content via the
	225	* seq_file interface.
	226	*
	227	* The @write function is called with the data copied into a kernel space
	228	* scratch buffer and has a NUL appended for convenience. The buffer may be
	229	* modified by the @write function. @write should return 0 on success.
	230	*
	231	* The @data value is accessible from the @show and @write functions by calling
	232	* PDE_DATA() on the file inode. The network namespace must be accessed by
	233	* calling seq_file_single_net() on the seq_file struct.
	234	*/
	235	struct proc_dir_entry proc_create_net_single_write(const char name, umode_t mode,
	236	struct proc_dir_entry *parent,
	237	int (show)(struct seq_file , void *),
	238	proc_write_t write,
	239	void *data)
	240	{
	241	struct proc_dir_entry *p;
	242
	243	p = proc_create_reg(name, mode, &parent, data);
	244	if (!p)
	245	return NULL;
1fde6f21	246	pde_force_lookup(p);
d56c0d45	247	p->proc_ops = &proc_net_single_ops;
564def71 DH	248	p->single_show = show;
	249	p->write = write;
	250	return proc_register(parent, p);
	251	}
	252	EXPORT_SYMBOL_GPL(proc_create_net_single_write);
	253
e9720acd PE	254	static struct net get_proc_task_net(struct inode dir)
	255	{
	256	struct task_struct *task;
	257	struct nsproxy *ns;
	258	struct net *net = NULL;
	259
	260	rcu_read_lock();
	261	task = pid_task(proc_pid(dir), PIDTYPE_PID);
	262	if (task != NULL) {
728dba3a EB	263	task_lock(task);
728dba3a EB	264	ns = task->nsproxy;
e9720acd PE	265	if (ns != NULL)
e9720acd PE	266	net = get_net(ns->net_ns);
728dba3a	267	task_unlock(task);
e9720acd PE	268	}
	269	rcu_read_unlock();
	270
	271	return net;
	272	}
	273
	274	static struct dentry proc_tgid_net_lookup(struct inode dir,
00cd8dd3	275	struct dentry *dentry, unsigned int flags)
e9720acd PE	276	{
	277	struct dentry *de;
	278	struct net *net;
	279
	280	de = ERR_PTR(-ENOENT);
	281	net = get_proc_task_net(dir);
	282	if (net != NULL) {
93ad5bc6	283	de = proc_lookup_de(dir, dentry, net->proc_net);
e9720acd PE	284	put_net(net);
	285	}
	286	return de;
	287	}
	288
a528d35e DH	289	static int proc_tgid_net_getattr(const struct path path, struct kstat stat,
a528d35e DH	290	u32 request_mask, unsigned int query_flags)
e9720acd	291	{
a528d35e	292	struct inode *inode = d_inode(path->dentry);
e9720acd PE	293	struct net *net;
	294
	295	net = get_proc_task_net(inode);
	296
	297	generic_fillattr(inode, stat);
	298
	299	if (net != NULL) {
	300	stat->nlink = net->proc_net->nlink;
	301	put_net(net);
	302	}
	303
	304	return 0;
	305	}
	306
	307	const struct inode_operations proc_net_inode_operations = {
	308	.lookup = proc_tgid_net_lookup,
	309	.getattr = proc_tgid_net_getattr,
	310	};
	311
f0c3b509	312	static int proc_tgid_net_readdir(struct file file, struct dir_context ctx)
e9720acd PE	313	{
	314	int ret;
	315	struct net *net;
	316
	317	ret = -EINVAL;
f0c3b509	318	net = get_proc_task_net(file_inode(file));
e9720acd	319	if (net != NULL) {
93ad5bc6	320	ret = proc_readdir_de(file, ctx, net->proc_net);
e9720acd PE	321	put_net(net);
	322	}
	323	return ret;
	324	}
	325
	326	const struct file_operations proc_net_operations = {
b4df2b92	327	.llseek = generic_file_llseek,
e9720acd	328	.read = generic_read_dir,
f50752ea	329	.iterate_shared = proc_tgid_net_readdir,
e9720acd PE	330	};
e9720acd PE	331
4665079c	332	static __net_init int proc_net_ns_init(struct net *net)
3c12afe7	333	{
e9720acd	334	struct proc_dir_entry netd, net_statd;
c110486f DT	335	kuid_t uid;
c110486f DT	336	kgid_t gid;
3c12afe7 DM	337	int err;
	338
	339	err = -ENOMEM;
b4884f23	340	netd = kmem_cache_zalloc(proc_dir_entry_cache, GFP_KERNEL);
e9720acd	341	if (!netd)
3c12afe7 DM	342	goto out;
3c12afe7 DM	343
4f113437	344	netd->subdir = RB_ROOT;
e9720acd PE	345	netd->data = net;
e9720acd PE	346	netd->nlink = 2;
e9720acd PE	347	netd->namelen = 3;
e9720acd PE	348	netd->parent = &proc_root;
b4884f23	349	netd->name = netd->inline_name;
09570f91	350	memcpy(netd->name, "net", 4);
3c12afe7	351
c110486f DT	352	uid = make_kuid(net->user_ns, 0);
	353	if (!uid_valid(uid))
	354	uid = netd->uid;
	355
	356	gid = make_kgid(net->user_ns, 0);
	357	if (!gid_valid(gid))
	358	gid = netd->gid;
	359
	360	proc_set_user(netd, uid, gid);
	361
3c12afe7	362	err = -EEXIST;
e5d69b9f	363	net_statd = proc_net_mkdir(net, "stat", netd);
3c12afe7 DM	364	if (!net_statd)
	365	goto free_net;
	366
3c12afe7 DM	367	net->proc_net = netd;
3c12afe7 DM	368	net->proc_net_stat = net_statd;
e9720acd	369	return 0;
3c12afe7	370
e9720acd	371	free_net:
b4884f23	372	pde_free(netd);
3c12afe7 DM	373	out:
3c12afe7 DM	374	return err;
3c12afe7 DM	375	}
3c12afe7 DM	376
4665079c	377	static __net_exit void proc_net_ns_exit(struct net *net)
3c12afe7 DM	378	{
3c12afe7 DM	379	remove_proc_entry("stat", net->proc_net);
b4884f23	380	pde_free(net->proc_net);
3c12afe7 DM	381	}
3c12afe7 DM	382
022cbae6	383	static struct pernet_operations __net_initdata proc_net_ns_ops = {
3c12afe7 DM	384	.init = proc_net_ns_init,
	385	.exit = proc_net_ns_exit,
	386	};
	387
4665079c	388	int __init proc_net_init(void)
3c12afe7	389	{
155134fe	390	proc_symlink("net", NULL, "self/net");
3c12afe7 DM	391
	392	return register_pernet_subsys(&proc_net_ns_ops);
	393	}