blob: e66e9b63261763eee8b325bd9d79b041622e135e [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Denis V. Lunev2d38f9a2008-03-27 14:26:30 -070018#include <linux/string.h>
19#include <linux/kobject.h>
20#include <linux/module.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090021#include <linux/slab.h>
Eric W. Biederman417daa12010-05-04 17:36:48 -070022#include <linux/user_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/socket.h>
24#include <linux/skbuff.h>
25#include <linux/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <net/sock.h>
Eric W. Biederman07e98962010-05-04 17:36:44 -070027#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Cornelia Huckcd030c42007-07-20 13:58:13 +020030u64 uevent_seqnum;
Kay Sievers6a8d8ab2007-08-15 15:38:28 +020031char uevent_helper[UEVENT_HELPER_PATH_LEN] = CONFIG_UEVENT_HELPER_PATH;
Cornelia Huckcd030c42007-07-20 13:58:13 +020032static DEFINE_SPINLOCK(sequence_lock);
Eric W. Biederman07e98962010-05-04 17:36:44 -070033#ifdef CONFIG_NET
34struct uevent_sock {
35 struct list_head list;
36 struct sock *sk;
37};
38static LIST_HEAD(uevent_sock_list);
39static DEFINE_MUTEX(uevent_sock_mutex);
Cornelia Huckcd030c42007-07-20 13:58:13 +020040#endif
41
Kay Sievers5c5daf62007-08-12 20:43:55 +020042/* the strings here must match the enum in include/linux/kobject.h */
43static const char *kobject_actions[] = {
44 [KOBJ_ADD] = "add",
45 [KOBJ_REMOVE] = "remove",
46 [KOBJ_CHANGE] = "change",
47 [KOBJ_MOVE] = "move",
48 [KOBJ_ONLINE] = "online",
49 [KOBJ_OFFLINE] = "offline",
50};
51
52/**
53 * kobject_action_type - translate action string to numeric type
54 *
55 * @buf: buffer containing the action string, newline is ignored
56 * @len: length of buffer
57 * @type: pointer to the location to store the action type
58 *
59 * Returns 0 if the action string was recognized.
60 */
61int kobject_action_type(const char *buf, size_t count,
62 enum kobject_action *type)
63{
64 enum kobject_action action;
65 int ret = -EINVAL;
66
Mark Lorda9edadb2008-03-28 19:05:25 -040067 if (count && (buf[count-1] == '\n' || buf[count-1] == '\0'))
Kay Sievers5c5daf62007-08-12 20:43:55 +020068 count--;
69
70 if (!count)
71 goto out;
72
73 for (action = 0; action < ARRAY_SIZE(kobject_actions); action++) {
74 if (strncmp(kobject_actions[action], buf, count) != 0)
75 continue;
76 if (kobject_actions[action][count] != '\0')
77 continue;
78 *type = action;
79 ret = 0;
80 break;
81 }
82out:
83 return ret;
84}
85
Andrew Mortonc8421282010-05-21 15:05:21 -070086#ifdef CONFIG_NET
Eric W. Biederman5f71a292010-05-04 17:36:47 -070087static int kobj_bcast_filter(struct sock *dsk, struct sk_buff *skb, void *data)
88{
89 struct kobject *kobj = data;
90 const struct kobj_ns_type_operations *ops;
91
92 ops = kobj_ns_ops(kobj);
93 if (ops) {
94 const void *sock_ns, *ns;
95 ns = kobj->ktype->namespace(kobj);
96 sock_ns = ops->netlink_ns(dsk);
97 return sock_ns != ns;
98 }
99
100 return 0;
101}
Andrew Mortonc8421282010-05-21 15:05:21 -0700102#endif
Eric W. Biederman5f71a292010-05-04 17:36:47 -0700103
Eric W. Biederman417daa12010-05-04 17:36:48 -0700104static int kobj_usermode_filter(struct kobject *kobj)
105{
106 const struct kobj_ns_type_operations *ops;
107
108 ops = kobj_ns_ops(kobj);
109 if (ops) {
110 const void *init_ns, *ns;
111 ns = kobj->ktype->namespace(kobj);
112 init_ns = ops->initial_ns();
113 return ns != init_ns;
114 }
115
116 return 0;
117}
118
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119/**
Cornelia Huck8a824722006-11-20 17:07:51 +0100120 * kobject_uevent_env - send an uevent with environmental data
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 *
Kay Sieversccd490a2007-08-12 20:43:55 +0200122 * @action: action that is happening
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 * @kobj: struct kobject that the action is happening to
Cornelia Huck8a824722006-11-20 17:07:51 +0100124 * @envp_ext: pointer to environmental data
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800125 *
Xiaotian Fengf6e6e772010-08-13 18:58:10 +0800126 * Returns 0 if kobject_uevent_env() is completed with success or the
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800127 * corresponding error when it fails.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 */
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800129int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
Kay Sievers7eff2e72007-08-14 15:15:12 +0200130 char *envp_ext[])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131{
Kay Sievers7eff2e72007-08-14 15:15:12 +0200132 struct kobj_uevent_env *env;
133 const char *action_string = kobject_actions[action];
Kay Sievers5f123fb2005-11-11 14:43:07 +0100134 const char *devpath = NULL;
135 const char *subsystem;
136 struct kobject *top_kobj;
137 struct kset *kset;
Emese Revfy9cd43612009-12-31 14:52:51 +0100138 const struct kset_uevent_ops *uevent_ops;
Kay Sievers5f123fb2005-11-11 14:43:07 +0100139 u64 seq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 int i = 0;
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800141 int retval = 0;
Eric W. Biederman07e98962010-05-04 17:36:44 -0700142#ifdef CONFIG_NET
143 struct uevent_sock *ue_sk;
144#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
Greg Kroah-Hartman9f66fa22007-11-28 23:49:41 -0800146 pr_debug("kobject: '%s' (%p): %s\n",
Harvey Harrison810304d2008-04-30 00:55:08 -0700147 kobject_name(kobj), kobj, __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
Kay Sievers5f123fb2005-11-11 14:43:07 +0100149 /* search the kset we belong to */
150 top_kobj = kobj;
Kay Sieversccd490a2007-08-12 20:43:55 +0200151 while (!top_kobj->kset && top_kobj->parent)
John Anthony Kazos Jr14193fb2007-04-04 07:39:17 -0400152 top_kobj = top_kobj->parent;
Kay Sieversccd490a2007-08-12 20:43:55 +0200153
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800154 if (!top_kobj->kset) {
Greg Kroah-Hartman9f66fa22007-11-28 23:49:41 -0800155 pr_debug("kobject: '%s' (%p): %s: attempted to send uevent "
156 "without kset!\n", kobject_name(kobj), kobj,
Harvey Harrison810304d2008-04-30 00:55:08 -0700157 __func__);
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800158 return -EINVAL;
159 }
Kay Sievers5f123fb2005-11-11 14:43:07 +0100160
161 kset = top_kobj->kset;
Kay Sievers312c0042005-11-16 09:00:00 +0100162 uevent_ops = kset->uevent_ops;
Kay Sievers5f123fb2005-11-11 14:43:07 +0100163
Ming Leif67f1292009-03-01 21:10:49 +0800164 /* skip the event, if uevent_suppress is set*/
165 if (kobj->uevent_suppress) {
166 pr_debug("kobject: '%s' (%p): %s: uevent_suppress "
167 "caused the event to drop!\n",
168 kobject_name(kobj), kobj, __func__);
169 return 0;
170 }
Kay Sievers7eff2e72007-08-14 15:15:12 +0200171 /* skip the event, if the filter returns zero. */
Kay Sievers312c0042005-11-16 09:00:00 +0100172 if (uevent_ops && uevent_ops->filter)
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800173 if (!uevent_ops->filter(kset, kobj)) {
Greg Kroah-Hartman9f66fa22007-11-28 23:49:41 -0800174 pr_debug("kobject: '%s' (%p): %s: filter function "
175 "caused the event to drop!\n",
Harvey Harrison810304d2008-04-30 00:55:08 -0700176 kobject_name(kobj), kobj, __func__);
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800177 return 0;
178 }
Kay Sievers5f123fb2005-11-11 14:43:07 +0100179
Kay Sievers86406242007-03-14 03:25:56 +0100180 /* originating subsystem */
181 if (uevent_ops && uevent_ops->name)
182 subsystem = uevent_ops->name(kset, kobj);
183 else
184 subsystem = kobject_name(&kset->kobj);
185 if (!subsystem) {
Greg Kroah-Hartman9f66fa22007-11-28 23:49:41 -0800186 pr_debug("kobject: '%s' (%p): %s: unset subsystem caused the "
187 "event to drop!\n", kobject_name(kobj), kobj,
Harvey Harrison810304d2008-04-30 00:55:08 -0700188 __func__);
Kay Sievers86406242007-03-14 03:25:56 +0100189 return 0;
190 }
191
Kay Sievers7eff2e72007-08-14 15:15:12 +0200192 /* environment buffer */
193 env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
194 if (!env)
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800195 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196
Kay Sievers5f123fb2005-11-11 14:43:07 +0100197 /* complete object path */
198 devpath = kobject_get_path(kobj, GFP_KERNEL);
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800199 if (!devpath) {
200 retval = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 goto exit;
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800202 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
Kay Sievers5f123fb2005-11-11 14:43:07 +0100204 /* default keys */
Kay Sievers7eff2e72007-08-14 15:15:12 +0200205 retval = add_uevent_var(env, "ACTION=%s", action_string);
206 if (retval)
207 goto exit;
208 retval = add_uevent_var(env, "DEVPATH=%s", devpath);
209 if (retval)
210 goto exit;
211 retval = add_uevent_var(env, "SUBSYSTEM=%s", subsystem);
212 if (retval)
213 goto exit;
214
215 /* keys passed in from the caller */
216 if (envp_ext) {
217 for (i = 0; envp_ext[i]; i++) {
Tejun Heoc65b9142008-11-13 13:20:00 +0900218 retval = add_uevent_var(env, "%s", envp_ext[i]);
Kay Sievers7eff2e72007-08-14 15:15:12 +0200219 if (retval)
220 goto exit;
221 }
222 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
Kay Sievers5f123fb2005-11-11 14:43:07 +0100224 /* let the kset specific function add its stuff */
Kay Sievers312c0042005-11-16 09:00:00 +0100225 if (uevent_ops && uevent_ops->uevent) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200226 retval = uevent_ops->uevent(kset, kobj, env);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 if (retval) {
Greg Kroah-Hartman9f66fa22007-11-28 23:49:41 -0800228 pr_debug("kobject: '%s' (%p): %s: uevent() returned "
229 "%d\n", kobject_name(kobj), kobj,
Harvey Harrison810304d2008-04-30 00:55:08 -0700230 __func__, retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 goto exit;
232 }
233 }
234
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100235 /*
236 * Mark "add" and "remove" events in the object to ensure proper
237 * events to userspace during automatic cleanup. If the object did
238 * send an "add" event, "remove" will automatically generated by
239 * the core, if not already done by the caller.
240 */
241 if (action == KOBJ_ADD)
242 kobj->state_add_uevent_sent = 1;
243 else if (action == KOBJ_REMOVE)
244 kobj->state_remove_uevent_sent = 1;
245
Kay Sievers7eff2e72007-08-14 15:15:12 +0200246 /* we will send an event, so request a new sequence number */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 spin_lock(&sequence_lock);
Kay Sievers312c0042005-11-16 09:00:00 +0100248 seq = ++uevent_seqnum;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 spin_unlock(&sequence_lock);
Kay Sievers7eff2e72007-08-14 15:15:12 +0200250 retval = add_uevent_var(env, "SEQNUM=%llu", (unsigned long long)seq);
251 if (retval)
252 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
Kay Sievers4d17ffd2006-04-25 15:37:26 +0200254#if defined(CONFIG_NET)
Kay Sievers5f123fb2005-11-11 14:43:07 +0100255 /* send netlink message */
Eric W. Biederman07e98962010-05-04 17:36:44 -0700256 mutex_lock(&uevent_sock_mutex);
257 list_for_each_entry(ue_sk, &uevent_sock_list, list) {
258 struct sock *uevent_sock = ue_sk->sk;
Kay Sievers5f123fb2005-11-11 14:43:07 +0100259 struct sk_buff *skb;
260 size_t len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
Kay Sievers74099b12011-12-05 19:12:47 +0100262 if (!netlink_has_listeners(uevent_sock, 1))
263 continue;
264
Kay Sievers5f123fb2005-11-11 14:43:07 +0100265 /* allocate message with the maximum possible size */
266 len = strlen(action_string) + strlen(devpath) + 2;
Kay Sievers7eff2e72007-08-14 15:15:12 +0200267 skb = alloc_skb(len + env->buflen, GFP_KERNEL);
Kay Sievers5f123fb2005-11-11 14:43:07 +0100268 if (skb) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200269 char *scratch;
270
Kay Sievers5f123fb2005-11-11 14:43:07 +0100271 /* add header */
272 scratch = skb_put(skb, len);
273 sprintf(scratch, "%s@%s", action_string, devpath);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274
Kay Sievers5f123fb2005-11-11 14:43:07 +0100275 /* copy keys to our continuous event payload buffer */
Kay Sievers7eff2e72007-08-14 15:15:12 +0200276 for (i = 0; i < env->envp_idx; i++) {
277 len = strlen(env->envp[i]) + 1;
Kay Sievers5f123fb2005-11-11 14:43:07 +0100278 scratch = skb_put(skb, len);
Kay Sievers7eff2e72007-08-14 15:15:12 +0200279 strcpy(scratch, env->envp[i]);
Kay Sievers5f123fb2005-11-11 14:43:07 +0100280 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281
Kay Sievers5f123fb2005-11-11 14:43:07 +0100282 NETLINK_CB(skb).dst_group = 1;
Eric W. Biederman5f71a292010-05-04 17:36:47 -0700283 retval = netlink_broadcast_filtered(uevent_sock, skb,
284 0, 1, GFP_KERNEL,
285 kobj_bcast_filter,
286 kobj);
Pablo Neira Ayusoff491a72009-02-05 23:56:36 -0800287 /* ENOBUFS should be handled in userspace */
Milan Brozebf41272011-08-22 15:51:34 +0200288 if (retval == -ENOBUFS || retval == -ESRCH)
Pablo Neira Ayusoff491a72009-02-05 23:56:36 -0800289 retval = 0;
Ming Leie0d7bf52008-11-16 18:23:27 +0800290 } else
291 retval = -ENOMEM;
Kay Sievers5f123fb2005-11-11 14:43:07 +0100292 }
Eric W. Biederman07e98962010-05-04 17:36:44 -0700293 mutex_unlock(&uevent_sock_mutex);
Kay Sievers4d17ffd2006-04-25 15:37:26 +0200294#endif
Kay Sievers5f123fb2005-11-11 14:43:07 +0100295
296 /* call uevent_helper, usually only enabled during early boot */
Eric W. Biederman417daa12010-05-04 17:36:48 -0700297 if (uevent_helper[0] && !kobj_usermode_filter(kobj)) {
Kay Sievers5f123fb2005-11-11 14:43:07 +0100298 char *argv [3];
299
Kay Sievers312c0042005-11-16 09:00:00 +0100300 argv [0] = uevent_helper;
Kay Sievers5f123fb2005-11-11 14:43:07 +0100301 argv [1] = (char *)subsystem;
302 argv [2] = NULL;
Kay Sievers7eff2e72007-08-14 15:15:12 +0200303 retval = add_uevent_var(env, "HOME=/");
304 if (retval)
305 goto exit;
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800306 retval = add_uevent_var(env,
307 "PATH=/sbin:/bin:/usr/sbin:/usr/bin");
Kay Sievers7eff2e72007-08-14 15:15:12 +0200308 if (retval)
309 goto exit;
310
Wang Chen0ad1d6f2008-06-24 16:59:02 +0800311 retval = call_usermodehelper(argv[0], argv,
Hugh Dickins05f54c12009-04-16 21:55:29 +0100312 env->envp, UMH_WAIT_EXEC);
Kay Sievers5f123fb2005-11-11 14:43:07 +0100313 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
315exit:
Kay Sievers5f123fb2005-11-11 14:43:07 +0100316 kfree(devpath);
Kay Sievers7eff2e72007-08-14 15:15:12 +0200317 kfree(env);
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800318 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319}
Cornelia Huck8a824722006-11-20 17:07:51 +0100320EXPORT_SYMBOL_GPL(kobject_uevent_env);
321
322/**
Xiaotian Fengf6e6e772010-08-13 18:58:10 +0800323 * kobject_uevent - notify userspace by sending an uevent
Cornelia Huck8a824722006-11-20 17:07:51 +0100324 *
Kay Sieversccd490a2007-08-12 20:43:55 +0200325 * @action: action that is happening
Cornelia Huck8a824722006-11-20 17:07:51 +0100326 * @kobj: struct kobject that the action is happening to
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800327 *
328 * Returns 0 if kobject_uevent() is completed with success or the
329 * corresponding error when it fails.
Cornelia Huck8a824722006-11-20 17:07:51 +0100330 */
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800331int kobject_uevent(struct kobject *kobj, enum kobject_action action)
Cornelia Huck8a824722006-11-20 17:07:51 +0100332{
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800333 return kobject_uevent_env(kobj, action, NULL);
Cornelia Huck8a824722006-11-20 17:07:51 +0100334}
Kay Sievers312c0042005-11-16 09:00:00 +0100335EXPORT_SYMBOL_GPL(kobject_uevent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
337/**
Kay Sievers7eff2e72007-08-14 15:15:12 +0200338 * add_uevent_var - add key value string to the environment buffer
339 * @env: environment buffer structure
340 * @format: printf format for the key=value pair
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 *
342 * Returns 0 if environment variable was added successfully or -ENOMEM
343 * if no space was available.
344 */
Kay Sievers7eff2e72007-08-14 15:15:12 +0200345int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346{
347 va_list args;
Kay Sievers7eff2e72007-08-14 15:15:12 +0200348 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
Kay Sievers7eff2e72007-08-14 15:15:12 +0200350 if (env->envp_idx >= ARRAY_SIZE(env->envp)) {
Arjan van de Ven5cd2b452008-07-25 19:45:39 -0700351 WARN(1, KERN_ERR "add_uevent_var: too many keys\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 return -ENOMEM;
Kay Sievers7eff2e72007-08-14 15:15:12 +0200353 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
355 va_start(args, format);
Kay Sievers7eff2e72007-08-14 15:15:12 +0200356 len = vsnprintf(&env->buf[env->buflen],
357 sizeof(env->buf) - env->buflen,
358 format, args);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 va_end(args);
360
Kay Sievers7eff2e72007-08-14 15:15:12 +0200361 if (len >= (sizeof(env->buf) - env->buflen)) {
Arjan van de Ven5cd2b452008-07-25 19:45:39 -0700362 WARN(1, KERN_ERR "add_uevent_var: buffer size too small\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 return -ENOMEM;
Kay Sievers7eff2e72007-08-14 15:15:12 +0200364 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
Kay Sievers7eff2e72007-08-14 15:15:12 +0200366 env->envp[env->envp_idx++] = &env->buf[env->buflen];
367 env->buflen += len + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 return 0;
369}
Kay Sievers312c0042005-11-16 09:00:00 +0100370EXPORT_SYMBOL_GPL(add_uevent_var);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371
Kay Sievers4d17ffd2006-04-25 15:37:26 +0200372#if defined(CONFIG_NET)
Eric W. Biederman07e98962010-05-04 17:36:44 -0700373static int uevent_net_init(struct net *net)
Kay Sievers5f123fb2005-11-11 14:43:07 +0100374{
Eric W. Biederman07e98962010-05-04 17:36:44 -0700375 struct uevent_sock *ue_sk;
376
377 ue_sk = kzalloc(sizeof(*ue_sk), GFP_KERNEL);
378 if (!ue_sk)
379 return -ENOMEM;
380
381 ue_sk->sk = netlink_kernel_create(net, NETLINK_KOBJECT_UEVENT,
382 1, NULL, NULL, THIS_MODULE);
383 if (!ue_sk->sk) {
Kay Sievers5f123fb2005-11-11 14:43:07 +0100384 printk(KERN_ERR
385 "kobject_uevent: unable to create netlink socket!\n");
Dan Carpenter743db2d2010-05-25 11:51:10 +0200386 kfree(ue_sk);
Kay Sievers5f123fb2005-11-11 14:43:07 +0100387 return -ENODEV;
388 }
Eric W. Biederman07e98962010-05-04 17:36:44 -0700389 mutex_lock(&uevent_sock_mutex);
390 list_add_tail(&ue_sk->list, &uevent_sock_list);
391 mutex_unlock(&uevent_sock_mutex);
Kay Sievers5f123fb2005-11-11 14:43:07 +0100392 return 0;
393}
394
Eric W. Biederman07e98962010-05-04 17:36:44 -0700395static void uevent_net_exit(struct net *net)
396{
397 struct uevent_sock *ue_sk;
398
399 mutex_lock(&uevent_sock_mutex);
400 list_for_each_entry(ue_sk, &uevent_sock_list, list) {
401 if (sock_net(ue_sk->sk) == net)
402 goto found;
403 }
404 mutex_unlock(&uevent_sock_mutex);
405 return;
406
407found:
408 list_del(&ue_sk->list);
409 mutex_unlock(&uevent_sock_mutex);
410
411 netlink_kernel_release(ue_sk->sk);
412 kfree(ue_sk);
413}
414
415static struct pernet_operations uevent_net_ops = {
416 .init = uevent_net_init,
417 .exit = uevent_net_exit,
418};
419
420static int __init kobject_uevent_init(void)
421{
422 netlink_set_nonroot(NETLINK_KOBJECT_UEVENT, NL_NONROOT_RECV);
423 return register_pernet_subsys(&uevent_net_ops);
424}
425
426
Kay Sievers5f123fb2005-11-11 14:43:07 +0100427postcore_initcall(kobject_uevent_init);
Kay Sievers4d17ffd2006-04-25 15:37:26 +0200428#endif