blob: 0401d2916d9fa25515540c0483dd486adaddc858 [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>
Paul Gortmaker8bc3bcc2011-11-16 21:29:17 -050020#include <linux/export.h>
21#include <linux/kmod.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090022#include <linux/slab.h>
Eric W. Biederman417daa12010-05-04 17:36:48 -070023#include <linux/user_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/socket.h>
25#include <linux/skbuff.h>
26#include <linux/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <net/sock.h>
Eric W. Biederman07e98962010-05-04 17:36:44 -070028#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
Cornelia Huckcd030c42007-07-20 13:58:13 +020031u64 uevent_seqnum;
Kay Sievers6a8d8ab2007-08-15 15:38:28 +020032char uevent_helper[UEVENT_HELPER_PATH_LEN] = CONFIG_UEVENT_HELPER_PATH;
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);
Cornelia Huckcd030c42007-07-20 13:58:13 +020039#endif
40
Andrew Vagin7b60a182012-03-07 14:49:56 +040041/* This lock protects uevent_seqnum and uevent_sock_list */
42static DEFINE_MUTEX(uevent_sock_mutex);
43
Kay Sievers5c5daf62007-08-12 20:43:55 +020044/* the strings here must match the enum in include/linux/kobject.h */
45static const char *kobject_actions[] = {
46 [KOBJ_ADD] = "add",
47 [KOBJ_REMOVE] = "remove",
48 [KOBJ_CHANGE] = "change",
49 [KOBJ_MOVE] = "move",
50 [KOBJ_ONLINE] = "online",
51 [KOBJ_OFFLINE] = "offline",
52};
53
54/**
55 * kobject_action_type - translate action string to numeric type
56 *
57 * @buf: buffer containing the action string, newline is ignored
58 * @len: length of buffer
59 * @type: pointer to the location to store the action type
60 *
61 * Returns 0 if the action string was recognized.
62 */
63int kobject_action_type(const char *buf, size_t count,
64 enum kobject_action *type)
65{
66 enum kobject_action action;
67 int ret = -EINVAL;
68
Mark Lorda9edadb2008-03-28 19:05:25 -040069 if (count && (buf[count-1] == '\n' || buf[count-1] == '\0'))
Kay Sievers5c5daf62007-08-12 20:43:55 +020070 count--;
71
72 if (!count)
73 goto out;
74
75 for (action = 0; action < ARRAY_SIZE(kobject_actions); action++) {
76 if (strncmp(kobject_actions[action], buf, count) != 0)
77 continue;
78 if (kobject_actions[action][count] != '\0')
79 continue;
80 *type = action;
81 ret = 0;
82 break;
83 }
84out:
85 return ret;
86}
87
Andrew Mortonc8421282010-05-21 15:05:21 -070088#ifdef CONFIG_NET
Eric W. Biederman5f71a292010-05-04 17:36:47 -070089static int kobj_bcast_filter(struct sock *dsk, struct sk_buff *skb, void *data)
90{
91 struct kobject *kobj = data;
92 const struct kobj_ns_type_operations *ops;
93
94 ops = kobj_ns_ops(kobj);
95 if (ops) {
96 const void *sock_ns, *ns;
97 ns = kobj->ktype->namespace(kobj);
98 sock_ns = ops->netlink_ns(dsk);
99 return sock_ns != ns;
100 }
101
102 return 0;
103}
Andrew Mortonc8421282010-05-21 15:05:21 -0700104#endif
Eric W. Biederman5f71a292010-05-04 17:36:47 -0700105
Eric W. Biederman417daa12010-05-04 17:36:48 -0700106static int kobj_usermode_filter(struct kobject *kobj)
107{
108 const struct kobj_ns_type_operations *ops;
109
110 ops = kobj_ns_ops(kobj);
111 if (ops) {
112 const void *init_ns, *ns;
113 ns = kobj->ktype->namespace(kobj);
114 init_ns = ops->initial_ns();
115 return ns != init_ns;
116 }
117
118 return 0;
119}
120
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121/**
Cornelia Huck8a824722006-11-20 17:07:51 +0100122 * kobject_uevent_env - send an uevent with environmental data
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 *
Kay Sieversccd490a2007-08-12 20:43:55 +0200124 * @action: action that is happening
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 * @kobj: struct kobject that the action is happening to
Cornelia Huck8a824722006-11-20 17:07:51 +0100126 * @envp_ext: pointer to environmental data
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800127 *
Xiaotian Fengf6e6e772010-08-13 18:58:10 +0800128 * Returns 0 if kobject_uevent_env() is completed with success or the
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800129 * corresponding error when it fails.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 */
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800131int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
Kay Sievers7eff2e72007-08-14 15:15:12 +0200132 char *envp_ext[])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133{
Kay Sievers7eff2e72007-08-14 15:15:12 +0200134 struct kobj_uevent_env *env;
135 const char *action_string = kobject_actions[action];
Kay Sievers5f123fb2005-11-11 14:43:07 +0100136 const char *devpath = NULL;
137 const char *subsystem;
138 struct kobject *top_kobj;
139 struct kset *kset;
Emese Revfy9cd43612009-12-31 14:52:51 +0100140 const struct kset_uevent_ops *uevent_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 int i = 0;
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800142 int retval = 0;
Eric W. Biederman07e98962010-05-04 17:36:44 -0700143#ifdef CONFIG_NET
144 struct uevent_sock *ue_sk;
145#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
Greg Kroah-Hartman9f66fa22007-11-28 23:49:41 -0800147 pr_debug("kobject: '%s' (%p): %s\n",
Harvey Harrison810304d2008-04-30 00:55:08 -0700148 kobject_name(kobj), kobj, __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
Kay Sievers5f123fb2005-11-11 14:43:07 +0100150 /* search the kset we belong to */
151 top_kobj = kobj;
Kay Sieversccd490a2007-08-12 20:43:55 +0200152 while (!top_kobj->kset && top_kobj->parent)
John Anthony Kazos Jr14193fb2007-04-04 07:39:17 -0400153 top_kobj = top_kobj->parent;
Kay Sieversccd490a2007-08-12 20:43:55 +0200154
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800155 if (!top_kobj->kset) {
Greg Kroah-Hartman9f66fa22007-11-28 23:49:41 -0800156 pr_debug("kobject: '%s' (%p): %s: attempted to send uevent "
157 "without kset!\n", kobject_name(kobj), kobj,
Harvey Harrison810304d2008-04-30 00:55:08 -0700158 __func__);
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800159 return -EINVAL;
160 }
Kay Sievers5f123fb2005-11-11 14:43:07 +0100161
162 kset = top_kobj->kset;
Kay Sievers312c0042005-11-16 09:00:00 +0100163 uevent_ops = kset->uevent_ops;
Kay Sievers5f123fb2005-11-11 14:43:07 +0100164
Ming Leif67f1292009-03-01 21:10:49 +0800165 /* skip the event, if uevent_suppress is set*/
166 if (kobj->uevent_suppress) {
167 pr_debug("kobject: '%s' (%p): %s: uevent_suppress "
168 "caused the event to drop!\n",
169 kobject_name(kobj), kobj, __func__);
170 return 0;
171 }
Kay Sievers7eff2e72007-08-14 15:15:12 +0200172 /* skip the event, if the filter returns zero. */
Kay Sievers312c0042005-11-16 09:00:00 +0100173 if (uevent_ops && uevent_ops->filter)
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800174 if (!uevent_ops->filter(kset, kobj)) {
Greg Kroah-Hartman9f66fa22007-11-28 23:49:41 -0800175 pr_debug("kobject: '%s' (%p): %s: filter function "
176 "caused the event to drop!\n",
Harvey Harrison810304d2008-04-30 00:55:08 -0700177 kobject_name(kobj), kobj, __func__);
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800178 return 0;
179 }
Kay Sievers5f123fb2005-11-11 14:43:07 +0100180
Kay Sievers86406242007-03-14 03:25:56 +0100181 /* originating subsystem */
182 if (uevent_ops && uevent_ops->name)
183 subsystem = uevent_ops->name(kset, kobj);
184 else
185 subsystem = kobject_name(&kset->kobj);
186 if (!subsystem) {
Greg Kroah-Hartman9f66fa22007-11-28 23:49:41 -0800187 pr_debug("kobject: '%s' (%p): %s: unset subsystem caused the "
188 "event to drop!\n", kobject_name(kobj), kobj,
Harvey Harrison810304d2008-04-30 00:55:08 -0700189 __func__);
Kay Sievers86406242007-03-14 03:25:56 +0100190 return 0;
191 }
192
Kay Sievers7eff2e72007-08-14 15:15:12 +0200193 /* environment buffer */
194 env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
195 if (!env)
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800196 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
Kay Sievers5f123fb2005-11-11 14:43:07 +0100198 /* complete object path */
199 devpath = kobject_get_path(kobj, GFP_KERNEL);
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800200 if (!devpath) {
201 retval = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 goto exit;
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800203 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204
Kay Sievers5f123fb2005-11-11 14:43:07 +0100205 /* default keys */
Kay Sievers7eff2e72007-08-14 15:15:12 +0200206 retval = add_uevent_var(env, "ACTION=%s", action_string);
207 if (retval)
208 goto exit;
209 retval = add_uevent_var(env, "DEVPATH=%s", devpath);
210 if (retval)
211 goto exit;
212 retval = add_uevent_var(env, "SUBSYSTEM=%s", subsystem);
213 if (retval)
214 goto exit;
215
216 /* keys passed in from the caller */
217 if (envp_ext) {
218 for (i = 0; envp_ext[i]; i++) {
Tejun Heoc65b9142008-11-13 13:20:00 +0900219 retval = add_uevent_var(env, "%s", envp_ext[i]);
Kay Sievers7eff2e72007-08-14 15:15:12 +0200220 if (retval)
221 goto exit;
222 }
223 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
Kay Sievers5f123fb2005-11-11 14:43:07 +0100225 /* let the kset specific function add its stuff */
Kay Sievers312c0042005-11-16 09:00:00 +0100226 if (uevent_ops && uevent_ops->uevent) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200227 retval = uevent_ops->uevent(kset, kobj, env);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 if (retval) {
Greg Kroah-Hartman9f66fa22007-11-28 23:49:41 -0800229 pr_debug("kobject: '%s' (%p): %s: uevent() returned "
230 "%d\n", kobject_name(kobj), kobj,
Harvey Harrison810304d2008-04-30 00:55:08 -0700231 __func__, retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 goto exit;
233 }
234 }
235
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100236 /*
237 * Mark "add" and "remove" events in the object to ensure proper
238 * events to userspace during automatic cleanup. If the object did
239 * send an "add" event, "remove" will automatically generated by
240 * the core, if not already done by the caller.
241 */
242 if (action == KOBJ_ADD)
243 kobj->state_add_uevent_sent = 1;
244 else if (action == KOBJ_REMOVE)
245 kobj->state_remove_uevent_sent = 1;
246
Andrew Vagin7b60a182012-03-07 14:49:56 +0400247 mutex_lock(&uevent_sock_mutex);
Kay Sievers7eff2e72007-08-14 15:15:12 +0200248 /* we will send an event, so request a new sequence number */
Andrew Vagin7b60a182012-03-07 14:49:56 +0400249 retval = add_uevent_var(env, "SEQNUM=%llu", (unsigned long long)++uevent_seqnum);
250 if (retval) {
251 mutex_unlock(&uevent_sock_mutex);
Kay Sievers7eff2e72007-08-14 15:15:12 +0200252 goto exit;
Andrew Vagin7b60a182012-03-07 14:49:56 +0400253 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254
Kay Sievers4d17ffd2006-04-25 15:37:26 +0200255#if defined(CONFIG_NET)
Kay Sievers5f123fb2005-11-11 14:43:07 +0100256 /* send netlink message */
Eric W. Biederman07e98962010-05-04 17:36:44 -0700257 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 }
Kay Sievers4d17ffd2006-04-25 15:37:26 +0200293#endif
Andrew Vagin7b60a182012-03-07 14:49:56 +0400294 mutex_unlock(&uevent_sock_mutex);
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;
Pablo Neira Ayusoa31f2d12012-06-29 06:15:21 +0000376 struct netlink_kernel_cfg cfg = {
377 .groups = 1,
378 };
Eric W. Biederman07e98962010-05-04 17:36:44 -0700379
380 ue_sk = kzalloc(sizeof(*ue_sk), GFP_KERNEL);
381 if (!ue_sk)
382 return -ENOMEM;
383
384 ue_sk->sk = netlink_kernel_create(net, NETLINK_KOBJECT_UEVENT,
Pablo Neira Ayusoa31f2d12012-06-29 06:15:21 +0000385 THIS_MODULE, &cfg);
Eric W. Biederman07e98962010-05-04 17:36:44 -0700386 if (!ue_sk->sk) {
Kay Sievers5f123fb2005-11-11 14:43:07 +0100387 printk(KERN_ERR
388 "kobject_uevent: unable to create netlink socket!\n");
Dan Carpenter743db2d2010-05-25 11:51:10 +0200389 kfree(ue_sk);
Kay Sievers5f123fb2005-11-11 14:43:07 +0100390 return -ENODEV;
391 }
Eric W. Biederman07e98962010-05-04 17:36:44 -0700392 mutex_lock(&uevent_sock_mutex);
393 list_add_tail(&ue_sk->list, &uevent_sock_list);
394 mutex_unlock(&uevent_sock_mutex);
Kay Sievers5f123fb2005-11-11 14:43:07 +0100395 return 0;
396}
397
Eric W. Biederman07e98962010-05-04 17:36:44 -0700398static void uevent_net_exit(struct net *net)
399{
400 struct uevent_sock *ue_sk;
401
402 mutex_lock(&uevent_sock_mutex);
403 list_for_each_entry(ue_sk, &uevent_sock_list, list) {
404 if (sock_net(ue_sk->sk) == net)
405 goto found;
406 }
407 mutex_unlock(&uevent_sock_mutex);
408 return;
409
410found:
411 list_del(&ue_sk->list);
412 mutex_unlock(&uevent_sock_mutex);
413
414 netlink_kernel_release(ue_sk->sk);
415 kfree(ue_sk);
416}
417
418static struct pernet_operations uevent_net_ops = {
419 .init = uevent_net_init,
420 .exit = uevent_net_exit,
421};
422
423static int __init kobject_uevent_init(void)
424{
425 netlink_set_nonroot(NETLINK_KOBJECT_UEVENT, NL_NONROOT_RECV);
426 return register_pernet_subsys(&uevent_net_ops);
427}
428
429
Kay Sievers5f123fb2005-11-11 14:43:07 +0100430postcore_initcall(kobject_uevent_init);
Kay Sievers4d17ffd2006-04-25 15:37:26 +0200431#endif