[net-next-2.6.git] / lib / kobject_uevent.c

/*
 * kernel userspace event delivery
 *
 * Copyright (C) 2004 Red Hat, Inc.  All rights reserved.
 * Copyright (C) 2004 Novell, Inc.  All rights reserved.
 * Copyright (C) 2004 IBM, Inc. All rights reserved.
 *
 * Licensed under the GNU GPL v2.
 *
 * Authors:
 *	Robert Love		<rml@novell.com>
 *	Kay Sievers		<kay.sievers@vrfy.org>
 *	Arjan van de Ven	<arjanv@redhat.com>
 *	Greg Kroah-Hartman	<greg@kroah.com>
 */

#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/kobject.h>
#include <linux/module.h>
#include <linux/slab.h>

#include <linux/socket.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
#include <net/sock.h>


u64 uevent_seqnum;
char uevent_helper[UEVENT_HELPER_PATH_LEN] = CONFIG_UEVENT_HELPER_PATH;
static DEFINE_SPINLOCK(sequence_lock);
#if defined(CONFIG_NET)
static struct sock *uevent_sock;
#endif

/* the strings here must match the enum in include/linux/kobject.h */
static const char *kobject_actions[] = {
	[KOBJ_ADD] =		"add",
	[KOBJ_REMOVE] =		"remove",
	[KOBJ_CHANGE] =		"change",
	[KOBJ_MOVE] =		"move",
	[KOBJ_ONLINE] =		"online",
	[KOBJ_OFFLINE] =	"offline",
};

/**
 * kobject_action_type - translate action string to numeric type
 *
 * @buf: buffer containing the action string, newline is ignored
 * @len: length of buffer
 * @type: pointer to the location to store the action type
 *
 * Returns 0 if the action string was recognized.
 */
int kobject_action_type(const char *buf, size_t count,
			enum kobject_action *type)
{
	enum kobject_action action;
	int ret = -EINVAL;

	if (count && (buf[count-1] == '\n' || buf[count-1] == '\0'))
		count--;

	if (!count)
		goto out;

	for (action = 0; action < ARRAY_SIZE(kobject_actions); action++) {
		if (strncmp(kobject_actions[action], buf, count) != 0)
			continue;
		if (kobject_actions[action][count] != '\0')
			continue;
		*type = action;
		ret = 0;
		break;
	}
out:
	return ret;
}

/**
 * kobject_uevent_env - send an uevent with environmental data
 *
 * @action: action that is happening
 * @kobj: struct kobject that the action is happening to
 * @envp_ext: pointer to environmental data
 *
 * Returns 0 if kobject_uevent() is completed with success or the
 * corresponding error when it fails.
 */
int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
		       char *envp_ext[])
{
	struct kobj_uevent_env *env;
	const char *action_string = kobject_actions[action];
	const char *devpath = NULL;
	const char *subsystem;
	struct kobject *top_kobj;
	struct kset *kset;
	const struct kset_uevent_ops *uevent_ops;
	u64 seq;
	int i = 0;
	int retval = 0;

	pr_debug("kobject: '%s' (%p): %s\n",
		 kobject_name(kobj), kobj, __func__);

	/* search the kset we belong to */
	top_kobj = kobj;
	while (!top_kobj->kset && top_kobj->parent)
		top_kobj = top_kobj->parent;

	if (!top_kobj->kset) {
		pr_debug("kobject: '%s' (%p): %s: attempted to send uevent "
			 "without kset!\n", kobject_name(kobj), kobj,
			 __func__);
		return -EINVAL;
	}

	kset = top_kobj->kset;
	uevent_ops = kset->uevent_ops;

	/* skip the event, if uevent_suppress is set*/
	if (kobj->uevent_suppress) {
		pr_debug("kobject: '%s' (%p): %s: uevent_suppress "
				 "caused the event to drop!\n",
				 kobject_name(kobj), kobj, __func__);
		return 0;
	}
	/* skip the event, if the filter returns zero. */
	if (uevent_ops && uevent_ops->filter)
		if (!uevent_ops->filter(kset, kobj)) {
			pr_debug("kobject: '%s' (%p): %s: filter function "
				 "caused the event to drop!\n",
				 kobject_name(kobj), kobj, __func__);
			return 0;
		}

	/* originating subsystem */
	if (uevent_ops && uevent_ops->name)
		subsystem = uevent_ops->name(kset, kobj);
	else
		subsystem = kobject_name(&kset->kobj);
	if (!subsystem) {
		pr_debug("kobject: '%s' (%p): %s: unset subsystem caused the "
			 "event to drop!\n", kobject_name(kobj), kobj,
			 __func__);
		return 0;
	}

	/* environment buffer */
	env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
	if (!env)
		return -ENOMEM;

	/* complete object path */
	devpath = kobject_get_path(kobj, GFP_KERNEL);
	if (!devpath) {
		retval = -ENOENT;
		goto exit;
	}

	/* default keys */
	retval = add_uevent_var(env, "ACTION=%s", action_string);
	if (retval)
		goto exit;
	retval = add_uevent_var(env, "DEVPATH=%s", devpath);
	if (retval)
		goto exit;
	retval = add_uevent_var(env, "SUBSYSTEM=%s", subsystem);
	if (retval)
		goto exit;

	/* keys passed in from the caller */
	if (envp_ext) {
		for (i = 0; envp_ext[i]; i++) {
			retval = add_uevent_var(env, "%s", envp_ext[i]);
			if (retval)
				goto exit;
		}
	}

	/* let the kset specific function add its stuff */
	if (uevent_ops && uevent_ops->uevent) {
		retval = uevent_ops->uevent(kset, kobj, env);
		if (retval) {
			pr_debug("kobject: '%s' (%p): %s: uevent() returned "
				 "%d\n", kobject_name(kobj), kobj,
				 __func__, retval);
			goto exit;
		}
	}

	/*
	 * Mark "add" and "remove" events in the object to ensure proper
	 * events to userspace during automatic cleanup. If the object did
	 * send an "add" event, "remove" will automatically generated by
	 * the core, if not already done by the caller.
	 */
	if (action == KOBJ_ADD)
		kobj->state_add_uevent_sent = 1;
	else if (action == KOBJ_REMOVE)
		kobj->state_remove_uevent_sent = 1;

	/* we will send an event, so request a new sequence number */
	spin_lock(&sequence_lock);
	seq = ++uevent_seqnum;
	spin_unlock(&sequence_lock);
	retval = add_uevent_var(env, "SEQNUM=%llu", (unsigned long long)seq);
	if (retval)
		goto exit;

#if defined(CONFIG_NET)
	/* send netlink message */
	if (uevent_sock) {
		struct sk_buff *skb;
		size_t len;

		/* allocate message with the maximum possible size */
		len = strlen(action_string) + strlen(devpath) + 2;
		skb = alloc_skb(len + env->buflen, GFP_KERNEL);
		if (skb) {
			char *scratch;

			/* add header */
			scratch = skb_put(skb, len);
			sprintf(scratch, "%s@%s", action_string, devpath);

			/* copy keys to our continuous event payload buffer */
			for (i = 0; i < env->envp_idx; i++) {
				len = strlen(env->envp[i]) + 1;
				scratch = skb_put(skb, len);
				strcpy(scratch, env->envp[i]);
			}

			NETLINK_CB(skb).dst_group = 1;
			retval = netlink_broadcast(uevent_sock, skb, 0, 1,
						   GFP_KERNEL);
			/* ENOBUFS should be handled in userspace */
			if (retval == -ENOBUFS)
				retval = 0;
		} else
			retval = -ENOMEM;
	}
#endif

	/* call uevent_helper, usually only enabled during early boot */
	if (uevent_helper[0]) {
		char *argv [3];

		argv [0] = uevent_helper;
		argv [1] = (char *)subsystem;
		argv [2] = NULL;
		retval = add_uevent_var(env, "HOME=/");
		if (retval)
			goto exit;
		retval = add_uevent_var(env,
					"PATH=/sbin:/bin:/usr/sbin:/usr/bin");
		if (retval)
			goto exit;

		retval = call_usermodehelper(argv[0], argv,
					     env->envp, UMH_WAIT_EXEC);
	}

exit:
	kfree(devpath);
	kfree(env);
	return retval;
}
EXPORT_SYMBOL_GPL(kobject_uevent_env);

/**
 * kobject_uevent - notify userspace by ending an uevent
 *
 * @action: action that is happening
 * @kobj: struct kobject that the action is happening to
 *
 * Returns 0 if kobject_uevent() is completed with success or the
 * corresponding error when it fails.
 */
int kobject_uevent(struct kobject *kobj, enum kobject_action action)
{
	return kobject_uevent_env(kobj, action, NULL);
}
EXPORT_SYMBOL_GPL(kobject_uevent);

/**
 * add_uevent_var - add key value string to the environment buffer
 * @env: environment buffer structure
 * @format: printf format for the key=value pair
 *
 * Returns 0 if environment variable was added successfully or -ENOMEM
 * if no space was available.
 */
int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...)
{
	va_list args;
	int len;

	if (env->envp_idx >= ARRAY_SIZE(env->envp)) {
		WARN(1, KERN_ERR "add_uevent_var: too many keys\n");
		return -ENOMEM;
	}

	va_start(args, format);
	len = vsnprintf(&env->buf[env->buflen],
			sizeof(env->buf) - env->buflen,
			format, args);
	va_end(args);

	if (len >= (sizeof(env->buf) - env->buflen)) {
		WARN(1, KERN_ERR "add_uevent_var: buffer size too small\n");
		return -ENOMEM;
	}

	env->envp[env->envp_idx++] = &env->buf[env->buflen];
	env->buflen += len + 1;
	return 0;
}
EXPORT_SYMBOL_GPL(add_uevent_var);

#if defined(CONFIG_NET)
static int __init kobject_uevent_init(void)
{
	uevent_sock = netlink_kernel_create(&init_net, NETLINK_KOBJECT_UEVENT,
					    1, NULL, NULL, THIS_MODULE);
	if (!uevent_sock) {
		printk(KERN_ERR
		       "kobject_uevent: unable to create netlink socket!\n");
		return -ENODEV;
	}
	netlink_set_nonroot(NETLINK_KOBJECT_UEVENT, NL_NONROOT_RECV);
	return 0;
}

postcore_initcall(kobject_uevent_init);
#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* kernel userspace event delivery
	3	*
	4	* Copyright (C) 2004 Red Hat, Inc. All rights reserved.
	5	* Copyright (C) 2004 Novell, Inc. All rights reserved.
	6	* Copyright (C) 2004 IBM, Inc. All rights reserved.
	7	*
	8	* Licensed under the GNU GPL v2.
	9	*
	10	* Authors:
	11	* Robert Love <rml@novell.com>
	12	* Kay Sievers <kay.sievers@vrfy.org>
	13	* Arjan van de Ven <arjanv@redhat.com>
	14	* Greg Kroah-Hartman <greg@kroah.com>
	15	*/
	16
	17	#include <linux/spinlock.h>
2d38f9a4 DL	18	#include <linux/string.h>
	19	#include <linux/kobject.h>
	20	#include <linux/module.h>
5a0e3ad6	21	#include <linux/slab.h>
2d38f9a4	22
1da177e4 LT	23	#include <linux/socket.h>
	24	#include <linux/skbuff.h>
	25	#include <linux/netlink.h>
1da177e4 LT	26	#include <net/sock.h>
1da177e4 LT	27
1da177e4	28
cd030c4c	29	u64 uevent_seqnum;
6a8d8abb	30	char uevent_helper[UEVENT_HELPER_PATH_LEN] = CONFIG_UEVENT_HELPER_PATH;
cd030c4c CH	31	static DEFINE_SPINLOCK(sequence_lock);
	32	#if defined(CONFIG_NET)
	33	static struct sock *uevent_sock;
	34	#endif
	35
5c5daf65 KS	36	/* the strings here must match the enum in include/linux/kobject.h */
	37	static const char *kobject_actions[] = {
	38	[KOBJ_ADD] = "add",
	39	[KOBJ_REMOVE] = "remove",
	40	[KOBJ_CHANGE] = "change",
	41	[KOBJ_MOVE] = "move",
	42	[KOBJ_ONLINE] = "online",
	43	[KOBJ_OFFLINE] = "offline",
	44	};
	45
	46	/**
	47	* kobject_action_type - translate action string to numeric type
	48	*
	49	* @buf: buffer containing the action string, newline is ignored
	50	* @len: length of buffer
	51	* @type: pointer to the location to store the action type
	52	*
	53	* Returns 0 if the action string was recognized.
	54	*/
	55	int kobject_action_type(const char *buf, size_t count,
	56	enum kobject_action *type)
	57	{
	58	enum kobject_action action;
	59	int ret = -EINVAL;
	60
a9edadbf	61	if (count && (buf[count-1] == '\n' \|\| buf[count-1] == '\0'))
5c5daf65 KS	62	count--;
	63
	64	if (!count)
	65	goto out;
	66
	67	for (action = 0; action < ARRAY_SIZE(kobject_actions); action++) {
	68	if (strncmp(kobject_actions[action], buf, count) != 0)
	69	continue;
	70	if (kobject_actions[action][count] != '\0')
	71	continue;
	72	*type = action;
	73	ret = 0;
	74	break;
	75	}
	76	out:
	77	return ret;
	78	}
	79
1da177e4	80	/**
8a82472f	81	* kobject_uevent_env - send an uevent with environmental data
1da177e4	82	*
ccd490a3	83	* @action: action that is happening
1da177e4	84	* @kobj: struct kobject that the action is happening to
8a82472f	85	* @envp_ext: pointer to environmental data
542cfce6 AK	86	*
	87	* Returns 0 if kobject_uevent() is completed with success or the
	88	* corresponding error when it fails.
1da177e4	89	*/
542cfce6	90	int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
7eff2e7a	91	char *envp_ext[])
1da177e4	92	{
7eff2e7a KS	93	struct kobj_uevent_env *env;
7eff2e7a KS	94	const char *action_string = kobject_actions[action];
5f123fbd KS	95	const char *devpath = NULL;
	96	const char *subsystem;
	97	struct kobject *top_kobj;
	98	struct kset *kset;
9cd43611	99	const struct kset_uevent_ops *uevent_ops;
5f123fbd	100	u64 seq;
1da177e4	101	int i = 0;
542cfce6	102	int retval = 0;
1da177e4	103
9f66fa2a	104	pr_debug("kobject: '%s' (%p): %s\n",
810304db	105	kobject_name(kobj), kobj, __func__);
5f123fbd	106
5f123fbd KS	107	/* search the kset we belong to */
5f123fbd KS	108	top_kobj = kobj;
ccd490a3	109	while (!top_kobj->kset && top_kobj->parent)
14193fb9	110	top_kobj = top_kobj->parent;
ccd490a3	111
542cfce6	112	if (!top_kobj->kset) {
9f66fa2a GKH	113	pr_debug("kobject: '%s' (%p): %s: attempted to send uevent "
9f66fa2a GKH	114	"without kset!\n", kobject_name(kobj), kobj,
810304db	115	__func__);
542cfce6 AK	116	return -EINVAL;
542cfce6 AK	117	}
1da177e4	118
5f123fbd	119	kset = top_kobj->kset;
312c004d	120	uevent_ops = kset->uevent_ops;
1da177e4	121
f67f129e ML	122	/* skip the event, if uevent_suppress is set*/
	123	if (kobj->uevent_suppress) {
	124	pr_debug("kobject: '%s' (%p): %s: uevent_suppress "
	125	"caused the event to drop!\n",
	126	kobject_name(kobj), kobj, __func__);
	127	return 0;
	128	}
7eff2e7a	129	/* skip the event, if the filter returns zero. */
312c004d	130	if (uevent_ops && uevent_ops->filter)
542cfce6	131	if (!uevent_ops->filter(kset, kobj)) {
9f66fa2a GKH	132	pr_debug("kobject: '%s' (%p): %s: filter function "
9f66fa2a GKH	133	"caused the event to drop!\n",
810304db	134	kobject_name(kobj), kobj, __func__);
542cfce6 AK	135	return 0;
542cfce6 AK	136	}
1da177e4	137
86406245 KS	138	/* originating subsystem */
	139	if (uevent_ops && uevent_ops->name)
	140	subsystem = uevent_ops->name(kset, kobj);
	141	else
	142	subsystem = kobject_name(&kset->kobj);
	143	if (!subsystem) {
9f66fa2a GKH	144	pr_debug("kobject: '%s' (%p): %s: unset subsystem caused the "
9f66fa2a GKH	145	"event to drop!\n", kobject_name(kobj), kobj,
810304db	146	__func__);
86406245 KS	147	return 0;
	148	}
	149
7eff2e7a KS	150	/* environment buffer */
	151	env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
	152	if (!env)
542cfce6	153	return -ENOMEM;
1da177e4	154
5f123fbd KS	155	/* complete object path */
5f123fbd KS	156	devpath = kobject_get_path(kobj, GFP_KERNEL);
542cfce6 AK	157	if (!devpath) {
542cfce6 AK	158	retval = -ENOENT;
5f123fbd	159	goto exit;
542cfce6	160	}
1da177e4	161
5f123fbd	162	/* default keys */
7eff2e7a KS	163	retval = add_uevent_var(env, "ACTION=%s", action_string);
	164	if (retval)
	165	goto exit;
	166	retval = add_uevent_var(env, "DEVPATH=%s", devpath);
	167	if (retval)
	168	goto exit;
	169	retval = add_uevent_var(env, "SUBSYSTEM=%s", subsystem);
	170	if (retval)
	171	goto exit;
	172
	173	/* keys passed in from the caller */
	174	if (envp_ext) {
	175	for (i = 0; envp_ext[i]; i++) {
c65b9145	176	retval = add_uevent_var(env, "%s", envp_ext[i]);
7eff2e7a KS	177	if (retval)
	178	goto exit;
	179	}
	180	}
1da177e4	181
5f123fbd	182	/* let the kset specific function add its stuff */
312c004d	183	if (uevent_ops && uevent_ops->uevent) {
7eff2e7a	184	retval = uevent_ops->uevent(kset, kobj, env);
1da177e4	185	if (retval) {
9f66fa2a GKH	186	pr_debug("kobject: '%s' (%p): %s: uevent() returned "
9f66fa2a GKH	187	"%d\n", kobject_name(kobj), kobj,
810304db	188	__func__, retval);
1da177e4 LT	189	goto exit;
	190	}
	191	}
	192
0f4dafc0 KS	193	/*
	194	* Mark "add" and "remove" events in the object to ensure proper
	195	* events to userspace during automatic cleanup. If the object did
	196	* send an "add" event, "remove" will automatically generated by
	197	* the core, if not already done by the caller.
	198	*/
	199	if (action == KOBJ_ADD)
	200	kobj->state_add_uevent_sent = 1;
	201	else if (action == KOBJ_REMOVE)
	202	kobj->state_remove_uevent_sent = 1;
	203
7eff2e7a	204	/* we will send an event, so request a new sequence number */
1da177e4	205	spin_lock(&sequence_lock);
312c004d	206	seq = ++uevent_seqnum;
1da177e4	207	spin_unlock(&sequence_lock);
7eff2e7a KS	208	retval = add_uevent_var(env, "SEQNUM=%llu", (unsigned long long)seq);
	209	if (retval)
	210	goto exit;
1da177e4	211
4d17ffda	212	#if defined(CONFIG_NET)
5f123fbd KS	213	/* send netlink message */
	214	if (uevent_sock) {
	215	struct sk_buff *skb;
	216	size_t len;
	217
	218	/* allocate message with the maximum possible size */
	219	len = strlen(action_string) + strlen(devpath) + 2;
7eff2e7a	220	skb = alloc_skb(len + env->buflen, GFP_KERNEL);
5f123fbd	221	if (skb) {
7eff2e7a KS	222	char *scratch;
7eff2e7a KS	223
5f123fbd KS	224	/* add header */
	225	scratch = skb_put(skb, len);
	226	sprintf(scratch, "%s@%s", action_string, devpath);
	227
	228	/* copy keys to our continuous event payload buffer */
7eff2e7a KS	229	for (i = 0; i < env->envp_idx; i++) {
7eff2e7a KS	230	len = strlen(env->envp[i]) + 1;
5f123fbd	231	scratch = skb_put(skb, len);
7eff2e7a	232	strcpy(scratch, env->envp[i]);
5f123fbd KS	233	}
	234
	235	NETLINK_CB(skb).dst_group = 1;
e0d7bf5d ML	236	retval = netlink_broadcast(uevent_sock, skb, 0, 1,
e0d7bf5d ML	237	GFP_KERNEL);
ff491a73 PNA	238	/* ENOBUFS should be handled in userspace */
	239	if (retval == -ENOBUFS)
	240	retval = 0;
e0d7bf5d ML	241	} else
e0d7bf5d ML	242	retval = -ENOMEM;
5f123fbd	243	}
4d17ffda	244	#endif
1da177e4	245
5f123fbd	246	/* call uevent_helper, usually only enabled during early boot */
312c004d	247	if (uevent_helper[0]) {
5f123fbd	248	char *argv [3];
1da177e4	249
312c004d	250	argv [0] = uevent_helper;
5f123fbd KS	251	argv [1] = (char *)subsystem;
5f123fbd KS	252	argv [2] = NULL;
7eff2e7a KS	253	retval = add_uevent_var(env, "HOME=/");
	254	if (retval)
	255	goto exit;
e374a2bf GKH	256	retval = add_uevent_var(env,
e374a2bf GKH	257	"PATH=/sbin:/bin:/usr/sbin:/usr/bin");
7eff2e7a KS	258	if (retval)
	259	goto exit;
	260
0ad1d6f3	261	retval = call_usermodehelper(argv[0], argv,
05f54c13	262	env->envp, UMH_WAIT_EXEC);
5f123fbd	263	}
1da177e4 LT	264
1da177e4 LT	265	exit:
5f123fbd	266	kfree(devpath);
7eff2e7a	267	kfree(env);
542cfce6	268	return retval;
1da177e4	269	}
8a82472f CH	270	EXPORT_SYMBOL_GPL(kobject_uevent_env);
	271
	272	/**
	273	* kobject_uevent - notify userspace by ending an uevent
	274	*
ccd490a3	275	* @action: action that is happening
8a82472f	276	* @kobj: struct kobject that the action is happening to
542cfce6 AK	277	*
	278	* Returns 0 if kobject_uevent() is completed with success or the
	279	* corresponding error when it fails.
8a82472f	280	*/
542cfce6	281	int kobject_uevent(struct kobject *kobj, enum kobject_action action)
8a82472f	282	{
542cfce6	283	return kobject_uevent_env(kobj, action, NULL);
8a82472f	284	}
312c004d	285	EXPORT_SYMBOL_GPL(kobject_uevent);
1da177e4 LT	286
1da177e4 LT	287	/**
7eff2e7a KS	288	* add_uevent_var - add key value string to the environment buffer
	289	* @env: environment buffer structure
	290	* @format: printf format for the key=value pair
1da177e4 LT	291	*
	292	* Returns 0 if environment variable was added successfully or -ENOMEM
	293	* if no space was available.
	294	*/
7eff2e7a	295	int add_uevent_var(struct kobj_uevent_env env, const char format, ...)
1da177e4 LT	296	{
1da177e4 LT	297	va_list args;
7eff2e7a	298	int len;
1da177e4	299
7eff2e7a	300	if (env->envp_idx >= ARRAY_SIZE(env->envp)) {
5cd2b459	301	WARN(1, KERN_ERR "add_uevent_var: too many keys\n");
1da177e4	302	return -ENOMEM;
7eff2e7a	303	}
1da177e4 LT	304
1da177e4 LT	305	va_start(args, format);
7eff2e7a KS	306	len = vsnprintf(&env->buf[env->buflen],
	307	sizeof(env->buf) - env->buflen,
	308	format, args);
1da177e4 LT	309	va_end(args);
1da177e4 LT	310
7eff2e7a	311	if (len >= (sizeof(env->buf) - env->buflen)) {
5cd2b459	312	WARN(1, KERN_ERR "add_uevent_var: buffer size too small\n");
1da177e4	313	return -ENOMEM;
7eff2e7a	314	}
1da177e4	315
7eff2e7a KS	316	env->envp[env->envp_idx++] = &env->buf[env->buflen];
7eff2e7a KS	317	env->buflen += len + 1;
1da177e4 LT	318	return 0;
1da177e4 LT	319	}
312c004d	320	EXPORT_SYMBOL_GPL(add_uevent_var);
1da177e4	321
4d17ffda	322	#if defined(CONFIG_NET)
5f123fbd KS	323	static int __init kobject_uevent_init(void)
5f123fbd KS	324	{
b4b51029 EB	325	uevent_sock = netlink_kernel_create(&init_net, NETLINK_KOBJECT_UEVENT,
b4b51029 EB	326	1, NULL, NULL, THIS_MODULE);
5f123fbd KS	327	if (!uevent_sock) {
	328	printk(KERN_ERR
	329	"kobject_uevent: unable to create netlink socket!\n");
	330	return -ENODEV;
	331	}
d094cbe9	332	netlink_set_nonroot(NETLINK_KOBJECT_UEVENT, NL_NONROOT_RECV);
5f123fbd KS	333	return 0;
	334	}
	335
	336	postcore_initcall(kobject_uevent_init);
4d17ffda	337	#endif