[linux-2.6-block.git] / fs / proc / proc_net.c

/*
 *  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 file_operations proc_net_seq_fops = {
	.open		= seq_open_net,
	.read		= seq_read,
	.write		= proc_simple_write,
	.llseek		= seq_lseek,
	.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;
	p->proc_fops = &proc_net_seq_fops;
	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;
	p->proc_fops = &proc_net_seq_fops;
	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 file_operations proc_net_single_fops = {
	.open		= single_open_net,
	.read		= seq_read,
	.write		= proc_simple_write,
	.llseek		= seq_lseek,
	.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;
	p->proc_fops = &proc_net_single_fops;
	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;
	p->proc_fops = &proc_net_single_fops;
	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
3c12afe7 DM	1	/*
	2	* linux/fs/proc/net.c
	3	*
	4	* Copyright (C) 2007
	5	*
	6	* Author: Eric Biederman <ebiederm@xmission.com>
	7	*
	8	* proc net directory handling functions
	9	*/
	10
7c0f6ba6	11	#include <linux/uaccess.h>
3c12afe7 DM	12
	13	#include <linux/errno.h>
	14	#include <linux/time.h>
	15	#include <linux/proc_fs.h>
	16	#include <linux/stat.h>
5a0e3ad6	17	#include <linux/slab.h>
3c12afe7 DM	18	#include <linux/init.h>
3c12afe7 DM	19	#include <linux/sched.h>
f719ff9b	20	#include <linux/sched/task.h>
3c12afe7 DM	21	#include <linux/module.h>
3c12afe7 DM	22	#include <linux/bitops.h>
3c12afe7 DM	23	#include <linux/mount.h>
3c12afe7 DM	24	#include <linux/nsproxy.h>
c110486f	25	#include <linux/uidgid.h>
3c12afe7	26	#include <net/net_namespace.h>
e372c414	27	#include <linux/seq_file.h>
3c12afe7 DM	28
	29	#include "internal.h"
	30
4abfd029 DH	31	static inline struct net PDE_NET(struct proc_dir_entry pde)
	32	{
	33	return pde->parent->data;
	34	}
3c12afe7	35
8086cd45 AB	36	static struct net get_proc_net(const struct inode inode)
	37	{
	38	return maybe_get_net(PDE_NET(PDE(inode)));
	39	}
	40
c3506372	41	static int seq_open_net(struct inode inode, struct file file)
e372c414	42	{
c3506372	43	unsigned int state_size = PDE(inode)->state_size;
e372c414	44	struct seq_net_private *p;
c3506372	45	struct net *net;
e372c414	46
c3506372	47	WARN_ON_ONCE(state_size < sizeof(*p));
e372c414	48
564def71 DH	49	if (file->f_mode & FMODE_WRITE && !PDE(inode)->write)
	50	return -EACCES;
	51
c3506372 CH	52	net = get_proc_net(inode);
c3506372 CH	53	if (!net)
e372c414 DL	54	return -ENXIO;
e372c414 DL	55
c3506372 CH	56	p = __seq_open_private(file, PDE(inode)->seq_ops, state_size);
c3506372 CH	57	if (!p) {
e372c414 DL	58	put_net(net);
	59	return -ENOMEM;
	60	}
1218854a	61	#ifdef CONFIG_NET_NS
e372c414	62	p->net = net;
1218854a	63	#endif
e372c414 DL	64	return 0;
e372c414 DL	65	}
c3506372 CH	66
	67	static int seq_release_net(struct inode ino, struct file f)
	68	{
	69	struct seq_file *seq = f->private_data;
	70
	71	put_net(seq_file_net(seq));
	72	seq_release_private(ino, f);
	73	return 0;
	74	}
	75
	76	static const struct file_operations proc_net_seq_fops = {
	77	.open = seq_open_net,
	78	.read = seq_read,
564def71	79	.write = proc_simple_write,
c3506372 CH	80	.llseek = seq_lseek,
	81	.release = seq_release_net,
	82	};
	83
	84	struct proc_dir_entry proc_create_net_data(const char name, umode_t mode,
	85	struct proc_dir_entry parent, const struct seq_operations ops,
	86	unsigned int state_size, void *data)
	87	{
	88	struct proc_dir_entry *p;
	89
	90	p = proc_create_reg(name, mode, &parent, data);
	91	if (!p)
	92	return NULL;
	93	p->proc_fops = &proc_net_seq_fops;
	94	p->seq_ops = ops;
	95	p->state_size = state_size;
	96	return proc_register(parent, p);
	97	}
	98	EXPORT_SYMBOL_GPL(proc_create_net_data);
e372c414	99
564def71 DH	100	/**
	101	* proc_create_net_data_write - Create a writable net_ns-specific proc file
	102	* @name: The name of the file.
	103	* @mode: The file's access mode.
	104	* @parent: The parent directory in which to create.
	105	* @ops: The seq_file ops with which to read the file.
	106	* @write: The write method which which to 'modify' the file.
	107	* @data: Data for retrieval by PDE_DATA().
	108	*
	109	* Create a network namespaced proc file in the @parent directory with the
	110	* specified @name and @mode that allows reading of a file that displays a
	111	* series of elements and also provides for the file accepting writes that have
	112	* some arbitrary effect.
	113	*
	114	* The functions in the @ops table are used to iterate over items to be
	115	* presented and extract the readable content using the seq_file interface.
	116	*
	117	* The @write function is called with the data copied into a kernel space
	118	* scratch buffer and has a NUL appended for convenience. The buffer may be
	119	* modified by the @write function. @write should return 0 on success.
	120	*
	121	* The @data value is accessible from the @show and @write functions by calling
	122	* PDE_DATA() on the file inode. The network namespace must be accessed by
	123	* calling seq_file_net() on the seq_file struct.
	124	*/
	125	struct proc_dir_entry proc_create_net_data_write(const char name, umode_t mode,
	126	struct proc_dir_entry *parent,
	127	const struct seq_operations *ops,
	128	proc_write_t write,
	129	unsigned int state_size, void *data)
	130	{
	131	struct proc_dir_entry *p;
	132
	133	p = proc_create_reg(name, mode, &parent, data);
	134	if (!p)
	135	return NULL;
	136	p->proc_fops = &proc_net_seq_fops;
	137	p->seq_ops = ops;
	138	p->state_size = state_size;
	139	p->write = write;
	140	return proc_register(parent, p);
	141	}
	142	EXPORT_SYMBOL_GPL(proc_create_net_data_write);
	143
3617d949	144	static int single_open_net(struct inode inode, struct file file)
de05c557	145	{
3617d949	146	struct proc_dir_entry *de = PDE(inode);
de05c557	147	struct net *net;
3617d949	148	int err;
de05c557	149
de05c557	150	net = get_proc_net(inode);
3617d949 CH	151	if (!net)
3617d949 CH	152	return -ENXIO;
de05c557	153
3617d949 CH	154	err = single_open(file, de->single_show, net);
	155	if (err)
	156	put_net(net);
de05c557 PE	157	return err;
de05c557 PE	158	}
de05c557	159
3617d949	160	static int single_release_net(struct inode ino, struct file f)
b6fcbdb4 PE	161	{
	162	struct seq_file *seq = f->private_data;
	163	put_net(seq->private);
	164	return single_release(ino, f);
	165	}
3617d949 CH	166
	167	static const struct file_operations proc_net_single_fops = {
	168	.open = single_open_net,
	169	.read = seq_read,
564def71	170	.write = proc_simple_write,
3617d949 CH	171	.llseek = seq_lseek,
	172	.release = single_release_net,
	173	};
	174
	175	struct proc_dir_entry proc_create_net_single(const char name, umode_t mode,
	176	struct proc_dir_entry *parent,
	177	int (show)(struct seq_file , void ), void data)
	178	{
	179	struct proc_dir_entry *p;
	180
	181	p = proc_create_reg(name, mode, &parent, data);
	182	if (!p)
	183	return NULL;
	184	p->proc_fops = &proc_net_single_fops;
	185	p->single_show = show;
	186	return proc_register(parent, p);
	187	}
	188	EXPORT_SYMBOL_GPL(proc_create_net_single);
b6fcbdb4	189
564def71 DH	190	/**
	191	* proc_create_net_single_write - Create a writable net_ns-specific proc file
	192	* @name: The name of the file.
	193	* @mode: The file's access mode.
	194	* @parent: The parent directory in which to create.
	195	* @show: The seqfile show method with which to read the file.
	196	* @write: The write method which which to 'modify' the file.
	197	* @data: Data for retrieval by PDE_DATA().
	198	*
	199	* Create a network-namespaced proc file in the @parent directory with the
	200	* specified @name and @mode that allows reading of a file that displays a
	201	* single element rather than a series and also provides for the file accepting
	202	* writes that have some arbitrary effect.
	203	*
	204	* The @show function is called to extract the readable content via the
	205	* seq_file interface.
	206	*
	207	* The @write function is called with the data copied into a kernel space
	208	* scratch buffer and has a NUL appended for convenience. The buffer may be
	209	* modified by the @write function. @write should return 0 on success.
	210	*
	211	* The @data value is accessible from the @show and @write functions by calling
	212	* PDE_DATA() on the file inode. The network namespace must be accessed by
	213	* calling seq_file_single_net() on the seq_file struct.
	214	*/
	215	struct proc_dir_entry proc_create_net_single_write(const char name, umode_t mode,
	216	struct proc_dir_entry *parent,
	217	int (show)(struct seq_file , void *),
	218	proc_write_t write,
	219	void *data)
	220	{
	221	struct proc_dir_entry *p;
	222
	223	p = proc_create_reg(name, mode, &parent, data);
	224	if (!p)
	225	return NULL;
	226	p->proc_fops = &proc_net_single_fops;
	227	p->single_show = show;
	228	p->write = write;
	229	return proc_register(parent, p);
	230	}
	231	EXPORT_SYMBOL_GPL(proc_create_net_single_write);
	232
e9720acd PE	233	static struct net get_proc_task_net(struct inode dir)
	234	{
	235	struct task_struct *task;
	236	struct nsproxy *ns;
	237	struct net *net = NULL;
	238
	239	rcu_read_lock();
	240	task = pid_task(proc_pid(dir), PIDTYPE_PID);
	241	if (task != NULL) {
728dba3a EB	242	task_lock(task);
728dba3a EB	243	ns = task->nsproxy;
e9720acd PE	244	if (ns != NULL)
e9720acd PE	245	net = get_net(ns->net_ns);
728dba3a	246	task_unlock(task);
e9720acd PE	247	}
	248	rcu_read_unlock();
	249
	250	return net;
	251	}
	252
	253	static struct dentry proc_tgid_net_lookup(struct inode dir,
00cd8dd3	254	struct dentry *dentry, unsigned int flags)
e9720acd PE	255	{
	256	struct dentry *de;
	257	struct net *net;
	258
	259	de = ERR_PTR(-ENOENT);
	260	net = get_proc_task_net(dir);
	261	if (net != NULL) {
93ad5bc6	262	de = proc_lookup_de(dir, dentry, net->proc_net);
e9720acd PE	263	put_net(net);
	264	}
	265	return de;
	266	}
	267
a528d35e DH	268	static int proc_tgid_net_getattr(const struct path path, struct kstat stat,
a528d35e DH	269	u32 request_mask, unsigned int query_flags)
e9720acd	270	{
a528d35e	271	struct inode *inode = d_inode(path->dentry);
e9720acd PE	272	struct net *net;
	273
	274	net = get_proc_task_net(inode);
	275
	276	generic_fillattr(inode, stat);
	277
	278	if (net != NULL) {
	279	stat->nlink = net->proc_net->nlink;
	280	put_net(net);
	281	}
	282
	283	return 0;
	284	}
	285
	286	const struct inode_operations proc_net_inode_operations = {
	287	.lookup = proc_tgid_net_lookup,
	288	.getattr = proc_tgid_net_getattr,
	289	};
	290
f0c3b509	291	static int proc_tgid_net_readdir(struct file file, struct dir_context ctx)
e9720acd PE	292	{
	293	int ret;
	294	struct net *net;
	295
	296	ret = -EINVAL;
f0c3b509	297	net = get_proc_task_net(file_inode(file));
e9720acd	298	if (net != NULL) {
93ad5bc6	299	ret = proc_readdir_de(file, ctx, net->proc_net);
e9720acd PE	300	put_net(net);
	301	}
	302	return ret;
	303	}
	304
	305	const struct file_operations proc_net_operations = {
b4df2b92	306	.llseek = generic_file_llseek,
e9720acd	307	.read = generic_read_dir,
f50752ea	308	.iterate_shared = proc_tgid_net_readdir,
e9720acd PE	309	};
e9720acd PE	310
4665079c	311	static __net_init int proc_net_ns_init(struct net *net)
3c12afe7	312	{
e9720acd	313	struct proc_dir_entry netd, net_statd;
c110486f DT	314	kuid_t uid;
c110486f DT	315	kgid_t gid;
3c12afe7 DM	316	int err;
	317
	318	err = -ENOMEM;
b4884f23	319	netd = kmem_cache_zalloc(proc_dir_entry_cache, GFP_KERNEL);
e9720acd	320	if (!netd)
3c12afe7 DM	321	goto out;
3c12afe7 DM	322
4f113437	323	netd->subdir = RB_ROOT;
e9720acd PE	324	netd->data = net;
e9720acd PE	325	netd->nlink = 2;
e9720acd PE	326	netd->namelen = 3;
e9720acd PE	327	netd->parent = &proc_root;
b4884f23	328	netd->name = netd->inline_name;
09570f91	329	memcpy(netd->name, "net", 4);
3c12afe7	330
c110486f DT	331	uid = make_kuid(net->user_ns, 0);
	332	if (!uid_valid(uid))
	333	uid = netd->uid;
	334
	335	gid = make_kgid(net->user_ns, 0);
	336	if (!gid_valid(gid))
	337	gid = netd->gid;
	338
	339	proc_set_user(netd, uid, gid);
	340
3c12afe7	341	err = -EEXIST;
e5d69b9f	342	net_statd = proc_net_mkdir(net, "stat", netd);
3c12afe7 DM	343	if (!net_statd)
	344	goto free_net;
	345
3c12afe7 DM	346	net->proc_net = netd;
3c12afe7 DM	347	net->proc_net_stat = net_statd;
e9720acd	348	return 0;
3c12afe7	349
e9720acd	350	free_net:
b4884f23	351	pde_free(netd);
3c12afe7 DM	352	out:
3c12afe7 DM	353	return err;
3c12afe7 DM	354	}
3c12afe7 DM	355
4665079c	356	static __net_exit void proc_net_ns_exit(struct net *net)
3c12afe7 DM	357	{
3c12afe7 DM	358	remove_proc_entry("stat", net->proc_net);
b4884f23	359	pde_free(net->proc_net);
3c12afe7 DM	360	}
3c12afe7 DM	361
022cbae6	362	static struct pernet_operations __net_initdata proc_net_ns_ops = {
3c12afe7 DM	363	.init = proc_net_ns_init,
	364	.exit = proc_net_ns_exit,
	365	};
	366
4665079c	367	int __init proc_net_init(void)
3c12afe7	368	{
155134fe	369	proc_symlink("net", NULL, "self/net");
3c12afe7 DM	370
	371	return register_pernet_subsys(&proc_net_ns_ops);
	372	}