blob: 9a2b811966ebfe82088030db637d0b98ecb99b5c [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>
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;
Michael Marineau86d56132014-04-10 14:09:31 -070031#ifdef CONFIG_UEVENT_HELPER
Kay Sievers6a8d8ab2007-08-15 15:38:28 +020032char uevent_helper[UEVENT_HELPER_PATH_LEN] = CONFIG_UEVENT_HELPER_PATH;
Michael Marineau86d56132014-04-10 14:09:31 -070033#endif
Eric W. Biederman07e98962010-05-04 17:36:44 -070034#ifdef CONFIG_NET
35struct uevent_sock {
36 struct list_head list;
37 struct sock *sk;
38};
39static LIST_HEAD(uevent_sock_list);
Cornelia Huckcd030c42007-07-20 13:58:13 +020040#endif
41
Andrew Vagin7b60a182012-03-07 14:49:56 +040042/* This lock protects uevent_seqnum and uevent_sock_list */
43static DEFINE_MUTEX(uevent_sock_mutex);
44
Kay Sievers5c5daf62007-08-12 20:43:55 +020045/* the strings here must match the enum in include/linux/kobject.h */
46static const char *kobject_actions[] = {
47 [KOBJ_ADD] = "add",
48 [KOBJ_REMOVE] = "remove",
49 [KOBJ_CHANGE] = "change",
50 [KOBJ_MOVE] = "move",
51 [KOBJ_ONLINE] = "online",
52 [KOBJ_OFFLINE] = "offline",
53};
54
55/**
56 * kobject_action_type - translate action string to numeric type
57 *
58 * @buf: buffer containing the action string, newline is ignored
Julia Lawalledbbf992016-10-01 21:46:28 +020059 * @count: length of buffer
Kay Sievers5c5daf62007-08-12 20:43:55 +020060 * @type: pointer to the location to store the action type
61 *
62 * Returns 0 if the action string was recognized.
63 */
64int kobject_action_type(const char *buf, size_t count,
65 enum kobject_action *type)
66{
67 enum kobject_action action;
68 int ret = -EINVAL;
69
Mark Lorda9edadb2008-03-28 19:05:25 -040070 if (count && (buf[count-1] == '\n' || buf[count-1] == '\0'))
Kay Sievers5c5daf62007-08-12 20:43:55 +020071 count--;
72
73 if (!count)
74 goto out;
75
76 for (action = 0; action < ARRAY_SIZE(kobject_actions); action++) {
77 if (strncmp(kobject_actions[action], buf, count) != 0)
78 continue;
79 if (kobject_actions[action][count] != '\0')
80 continue;
81 *type = action;
82 ret = 0;
83 break;
84 }
85out:
86 return ret;
87}
88
Andrew Mortonc8421282010-05-21 15:05:21 -070089#ifdef CONFIG_NET
Eric W. Biederman5f71a292010-05-04 17:36:47 -070090static int kobj_bcast_filter(struct sock *dsk, struct sk_buff *skb, void *data)
91{
Weilong Chen82ef3d52014-01-16 17:24:31 +080092 struct kobject *kobj = data, *ksobj;
Eric W. Biederman5f71a292010-05-04 17:36:47 -070093 const struct kobj_ns_type_operations *ops;
94
95 ops = kobj_ns_ops(kobj);
Weilong Chen82ef3d52014-01-16 17:24:31 +080096 if (!ops && kobj->kset) {
97 ksobj = &kobj->kset->kobj;
98 if (ksobj->parent != NULL)
99 ops = kobj_ns_ops(ksobj->parent);
100 }
101
102 if (ops && ops->netlink_ns && kobj->ktype->namespace) {
Eric W. Biederman5f71a292010-05-04 17:36:47 -0700103 const void *sock_ns, *ns;
104 ns = kobj->ktype->namespace(kobj);
105 sock_ns = ops->netlink_ns(dsk);
106 return sock_ns != ns;
107 }
108
109 return 0;
110}
Andrew Mortonc8421282010-05-21 15:05:21 -0700111#endif
Eric W. Biederman5f71a292010-05-04 17:36:47 -0700112
Michael Marineau86d56132014-04-10 14:09:31 -0700113#ifdef CONFIG_UEVENT_HELPER
Eric W. Biederman417daa12010-05-04 17:36:48 -0700114static int kobj_usermode_filter(struct kobject *kobj)
115{
116 const struct kobj_ns_type_operations *ops;
117
118 ops = kobj_ns_ops(kobj);
119 if (ops) {
120 const void *init_ns, *ns;
121 ns = kobj->ktype->namespace(kobj);
122 init_ns = ops->initial_ns();
123 return ns != init_ns;
124 }
125
126 return 0;
127}
128
Vladimir Davydovbcccff92014-04-03 14:48:21 -0700129static int init_uevent_argv(struct kobj_uevent_env *env, const char *subsystem)
130{
131 int len;
132
133 len = strlcpy(&env->buf[env->buflen], subsystem,
134 sizeof(env->buf) - env->buflen);
135 if (len >= (sizeof(env->buf) - env->buflen)) {
136 WARN(1, KERN_ERR "init_uevent_argv: buffer size too small\n");
137 return -ENOMEM;
138 }
139
140 env->argv[0] = uevent_helper;
141 env->argv[1] = &env->buf[env->buflen];
142 env->argv[2] = NULL;
143
144 env->buflen += len + 1;
145 return 0;
146}
147
148static void cleanup_uevent_env(struct subprocess_info *info)
149{
150 kfree(info->data);
151}
Michael Marineau86d56132014-04-10 14:09:31 -0700152#endif
Vladimir Davydovbcccff92014-04-03 14:48:21 -0700153
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154/**
Cornelia Huck8a824722006-11-20 17:07:51 +0100155 * kobject_uevent_env - send an uevent with environmental data
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 * @kobj: struct kobject that the action is happening to
Julia Lawalledbbf992016-10-01 21:46:28 +0200158 * @action: action that is happening
Cornelia Huck8a824722006-11-20 17:07:51 +0100159 * @envp_ext: pointer to environmental data
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800160 *
Xiaotian Fengf6e6e772010-08-13 18:58:10 +0800161 * Returns 0 if kobject_uevent_env() is completed with success or the
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800162 * corresponding error when it fails.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 */
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800164int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
Kay Sievers7eff2e72007-08-14 15:15:12 +0200165 char *envp_ext[])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166{
Kay Sievers7eff2e72007-08-14 15:15:12 +0200167 struct kobj_uevent_env *env;
168 const char *action_string = kobject_actions[action];
Kay Sievers5f123fb2005-11-11 14:43:07 +0100169 const char *devpath = NULL;
170 const char *subsystem;
171 struct kobject *top_kobj;
172 struct kset *kset;
Emese Revfy9cd43612009-12-31 14:52:51 +0100173 const struct kset_uevent_ops *uevent_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 int i = 0;
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800175 int retval = 0;
Eric W. Biederman07e98962010-05-04 17:36:44 -0700176#ifdef CONFIG_NET
177 struct uevent_sock *ue_sk;
178#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
Greg Kroah-Hartman9f66fa22007-11-28 23:49:41 -0800180 pr_debug("kobject: '%s' (%p): %s\n",
Harvey Harrison810304d2008-04-30 00:55:08 -0700181 kobject_name(kobj), kobj, __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182
Kay Sievers5f123fb2005-11-11 14:43:07 +0100183 /* search the kset we belong to */
184 top_kobj = kobj;
Kay Sieversccd490a2007-08-12 20:43:55 +0200185 while (!top_kobj->kset && top_kobj->parent)
John Anthony Kazos Jr14193fb2007-04-04 07:39:17 -0400186 top_kobj = top_kobj->parent;
Kay Sieversccd490a2007-08-12 20:43:55 +0200187
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800188 if (!top_kobj->kset) {
Greg Kroah-Hartman9f66fa22007-11-28 23:49:41 -0800189 pr_debug("kobject: '%s' (%p): %s: attempted to send uevent "
190 "without kset!\n", kobject_name(kobj), kobj,
Harvey Harrison810304d2008-04-30 00:55:08 -0700191 __func__);
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800192 return -EINVAL;
193 }
Kay Sievers5f123fb2005-11-11 14:43:07 +0100194
195 kset = top_kobj->kset;
Kay Sievers312c0042005-11-16 09:00:00 +0100196 uevent_ops = kset->uevent_ops;
Kay Sievers5f123fb2005-11-11 14:43:07 +0100197
Ming Leif67f1292009-03-01 21:10:49 +0800198 /* skip the event, if uevent_suppress is set*/
199 if (kobj->uevent_suppress) {
200 pr_debug("kobject: '%s' (%p): %s: uevent_suppress "
201 "caused the event to drop!\n",
202 kobject_name(kobj), kobj, __func__);
203 return 0;
204 }
Kay Sievers7eff2e72007-08-14 15:15:12 +0200205 /* skip the event, if the filter returns zero. */
Kay Sievers312c0042005-11-16 09:00:00 +0100206 if (uevent_ops && uevent_ops->filter)
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800207 if (!uevent_ops->filter(kset, kobj)) {
Greg Kroah-Hartman9f66fa22007-11-28 23:49:41 -0800208 pr_debug("kobject: '%s' (%p): %s: filter function "
209 "caused the event to drop!\n",
Harvey Harrison810304d2008-04-30 00:55:08 -0700210 kobject_name(kobj), kobj, __func__);
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800211 return 0;
212 }
Kay Sievers5f123fb2005-11-11 14:43:07 +0100213
Kay Sievers86406242007-03-14 03:25:56 +0100214 /* originating subsystem */
215 if (uevent_ops && uevent_ops->name)
216 subsystem = uevent_ops->name(kset, kobj);
217 else
218 subsystem = kobject_name(&kset->kobj);
219 if (!subsystem) {
Greg Kroah-Hartman9f66fa22007-11-28 23:49:41 -0800220 pr_debug("kobject: '%s' (%p): %s: unset subsystem caused the "
221 "event to drop!\n", kobject_name(kobj), kobj,
Harvey Harrison810304d2008-04-30 00:55:08 -0700222 __func__);
Kay Sievers86406242007-03-14 03:25:56 +0100223 return 0;
224 }
225
Kay Sievers7eff2e72007-08-14 15:15:12 +0200226 /* environment buffer */
227 env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
228 if (!env)
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800229 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
Kay Sievers5f123fb2005-11-11 14:43:07 +0100231 /* complete object path */
232 devpath = kobject_get_path(kobj, GFP_KERNEL);
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800233 if (!devpath) {
234 retval = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 goto exit;
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800236 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
Kay Sievers5f123fb2005-11-11 14:43:07 +0100238 /* default keys */
Kay Sievers7eff2e72007-08-14 15:15:12 +0200239 retval = add_uevent_var(env, "ACTION=%s", action_string);
240 if (retval)
241 goto exit;
242 retval = add_uevent_var(env, "DEVPATH=%s", devpath);
243 if (retval)
244 goto exit;
245 retval = add_uevent_var(env, "SUBSYSTEM=%s", subsystem);
246 if (retval)
247 goto exit;
248
249 /* keys passed in from the caller */
250 if (envp_ext) {
251 for (i = 0; envp_ext[i]; i++) {
Tejun Heoc65b9142008-11-13 13:20:00 +0900252 retval = add_uevent_var(env, "%s", envp_ext[i]);
Kay Sievers7eff2e72007-08-14 15:15:12 +0200253 if (retval)
254 goto exit;
255 }
256 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
Kay Sievers5f123fb2005-11-11 14:43:07 +0100258 /* let the kset specific function add its stuff */
Kay Sievers312c0042005-11-16 09:00:00 +0100259 if (uevent_ops && uevent_ops->uevent) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200260 retval = uevent_ops->uevent(kset, kobj, env);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 if (retval) {
Greg Kroah-Hartman9f66fa22007-11-28 23:49:41 -0800262 pr_debug("kobject: '%s' (%p): %s: uevent() returned "
263 "%d\n", kobject_name(kobj), kobj,
Harvey Harrison810304d2008-04-30 00:55:08 -0700264 __func__, retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 goto exit;
266 }
267 }
268
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100269 /*
270 * Mark "add" and "remove" events in the object to ensure proper
271 * events to userspace during automatic cleanup. If the object did
272 * send an "add" event, "remove" will automatically generated by
273 * the core, if not already done by the caller.
274 */
275 if (action == KOBJ_ADD)
276 kobj->state_add_uevent_sent = 1;
277 else if (action == KOBJ_REMOVE)
278 kobj->state_remove_uevent_sent = 1;
279
Andrew Vagin7b60a182012-03-07 14:49:56 +0400280 mutex_lock(&uevent_sock_mutex);
Kay Sievers7eff2e72007-08-14 15:15:12 +0200281 /* we will send an event, so request a new sequence number */
Andrew Vagin7b60a182012-03-07 14:49:56 +0400282 retval = add_uevent_var(env, "SEQNUM=%llu", (unsigned long long)++uevent_seqnum);
283 if (retval) {
284 mutex_unlock(&uevent_sock_mutex);
Kay Sievers7eff2e72007-08-14 15:15:12 +0200285 goto exit;
Andrew Vagin7b60a182012-03-07 14:49:56 +0400286 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287
Kay Sievers4d17ffd2006-04-25 15:37:26 +0200288#if defined(CONFIG_NET)
Kay Sievers5f123fb2005-11-11 14:43:07 +0100289 /* send netlink message */
Eric W. Biederman07e98962010-05-04 17:36:44 -0700290 list_for_each_entry(ue_sk, &uevent_sock_list, list) {
291 struct sock *uevent_sock = ue_sk->sk;
Kay Sievers5f123fb2005-11-11 14:43:07 +0100292 struct sk_buff *skb;
293 size_t len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
Kay Sievers74099b12011-12-05 19:12:47 +0100295 if (!netlink_has_listeners(uevent_sock, 1))
296 continue;
297
Kay Sievers5f123fb2005-11-11 14:43:07 +0100298 /* allocate message with the maximum possible size */
299 len = strlen(action_string) + strlen(devpath) + 2;
Kay Sievers7eff2e72007-08-14 15:15:12 +0200300 skb = alloc_skb(len + env->buflen, GFP_KERNEL);
Kay Sievers5f123fb2005-11-11 14:43:07 +0100301 if (skb) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200302 char *scratch;
303
Kay Sievers5f123fb2005-11-11 14:43:07 +0100304 /* add header */
305 scratch = skb_put(skb, len);
306 sprintf(scratch, "%s@%s", action_string, devpath);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307
Kay Sievers5f123fb2005-11-11 14:43:07 +0100308 /* copy keys to our continuous event payload buffer */
Kay Sievers7eff2e72007-08-14 15:15:12 +0200309 for (i = 0; i < env->envp_idx; i++) {
310 len = strlen(env->envp[i]) + 1;
Kay Sievers5f123fb2005-11-11 14:43:07 +0100311 scratch = skb_put(skb, len);
Kay Sievers7eff2e72007-08-14 15:15:12 +0200312 strcpy(scratch, env->envp[i]);
Kay Sievers5f123fb2005-11-11 14:43:07 +0100313 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
Kay Sievers5f123fb2005-11-11 14:43:07 +0100315 NETLINK_CB(skb).dst_group = 1;
Eric W. Biederman5f71a292010-05-04 17:36:47 -0700316 retval = netlink_broadcast_filtered(uevent_sock, skb,
317 0, 1, GFP_KERNEL,
318 kobj_bcast_filter,
319 kobj);
Pablo Neira Ayusoff491a72009-02-05 23:56:36 -0800320 /* ENOBUFS should be handled in userspace */
Milan Brozebf41272011-08-22 15:51:34 +0200321 if (retval == -ENOBUFS || retval == -ESRCH)
Pablo Neira Ayusoff491a72009-02-05 23:56:36 -0800322 retval = 0;
Ming Leie0d7bf52008-11-16 18:23:27 +0800323 } else
324 retval = -ENOMEM;
Kay Sievers5f123fb2005-11-11 14:43:07 +0100325 }
Kay Sievers4d17ffd2006-04-25 15:37:26 +0200326#endif
Andrew Vagin7b60a182012-03-07 14:49:56 +0400327 mutex_unlock(&uevent_sock_mutex);
Kay Sievers5f123fb2005-11-11 14:43:07 +0100328
Michael Marineau86d56132014-04-10 14:09:31 -0700329#ifdef CONFIG_UEVENT_HELPER
Kay Sievers5f123fb2005-11-11 14:43:07 +0100330 /* call uevent_helper, usually only enabled during early boot */
Eric W. Biederman417daa12010-05-04 17:36:48 -0700331 if (uevent_helper[0] && !kobj_usermode_filter(kobj)) {
Vladimir Davydovbcccff92014-04-03 14:48:21 -0700332 struct subprocess_info *info;
Kay Sievers5f123fb2005-11-11 14:43:07 +0100333
Kay Sievers7eff2e72007-08-14 15:15:12 +0200334 retval = add_uevent_var(env, "HOME=/");
335 if (retval)
336 goto exit;
Greg Kroah-Hartmane374a2b2008-01-24 21:59:04 -0800337 retval = add_uevent_var(env,
338 "PATH=/sbin:/bin:/usr/sbin:/usr/bin");
Kay Sievers7eff2e72007-08-14 15:15:12 +0200339 if (retval)
340 goto exit;
Vladimir Davydovbcccff92014-04-03 14:48:21 -0700341 retval = init_uevent_argv(env, subsystem);
342 if (retval)
343 goto exit;
Kay Sievers7eff2e72007-08-14 15:15:12 +0200344
Vladimir Davydovbcccff92014-04-03 14:48:21 -0700345 retval = -ENOMEM;
346 info = call_usermodehelper_setup(env->argv[0], env->argv,
347 env->envp, GFP_KERNEL,
348 NULL, cleanup_uevent_env, env);
349 if (info) {
350 retval = call_usermodehelper_exec(info, UMH_NO_WAIT);
351 env = NULL; /* freed by cleanup_uevent_env */
352 }
Kay Sievers5f123fb2005-11-11 14:43:07 +0100353 }
Michael Marineau86d56132014-04-10 14:09:31 -0700354#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
356exit:
Kay Sievers5f123fb2005-11-11 14:43:07 +0100357 kfree(devpath);
Kay Sievers7eff2e72007-08-14 15:15:12 +0200358 kfree(env);
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800359 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360}
Cornelia Huck8a824722006-11-20 17:07:51 +0100361EXPORT_SYMBOL_GPL(kobject_uevent_env);
362
363/**
Xiaotian Fengf6e6e772010-08-13 18:58:10 +0800364 * kobject_uevent - notify userspace by sending an uevent
Cornelia Huck8a824722006-11-20 17:07:51 +0100365 *
Cornelia Huck8a824722006-11-20 17:07:51 +0100366 * @kobj: struct kobject that the action is happening to
Julia Lawalledbbf992016-10-01 21:46:28 +0200367 * @action: action that is happening
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800368 *
369 * Returns 0 if kobject_uevent() is completed with success or the
370 * corresponding error when it fails.
Cornelia Huck8a824722006-11-20 17:07:51 +0100371 */
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800372int kobject_uevent(struct kobject *kobj, enum kobject_action action)
Cornelia Huck8a824722006-11-20 17:07:51 +0100373{
Aneesh Kumar K.V542cfce2006-12-19 13:01:27 -0800374 return kobject_uevent_env(kobj, action, NULL);
Cornelia Huck8a824722006-11-20 17:07:51 +0100375}
Kay Sievers312c0042005-11-16 09:00:00 +0100376EXPORT_SYMBOL_GPL(kobject_uevent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377
378/**
Kay Sievers7eff2e72007-08-14 15:15:12 +0200379 * add_uevent_var - add key value string to the environment buffer
380 * @env: environment buffer structure
381 * @format: printf format for the key=value pair
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 *
383 * Returns 0 if environment variable was added successfully or -ENOMEM
384 * if no space was available.
385 */
Kay Sievers7eff2e72007-08-14 15:15:12 +0200386int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387{
388 va_list args;
Kay Sievers7eff2e72007-08-14 15:15:12 +0200389 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390
Kay Sievers7eff2e72007-08-14 15:15:12 +0200391 if (env->envp_idx >= ARRAY_SIZE(env->envp)) {
Arjan van de Ven5cd2b452008-07-25 19:45:39 -0700392 WARN(1, KERN_ERR "add_uevent_var: too many keys\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 return -ENOMEM;
Kay Sievers7eff2e72007-08-14 15:15:12 +0200394 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395
396 va_start(args, format);
Kay Sievers7eff2e72007-08-14 15:15:12 +0200397 len = vsnprintf(&env->buf[env->buflen],
398 sizeof(env->buf) - env->buflen,
399 format, args);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 va_end(args);
401
Kay Sievers7eff2e72007-08-14 15:15:12 +0200402 if (len >= (sizeof(env->buf) - env->buflen)) {
Arjan van de Ven5cd2b452008-07-25 19:45:39 -0700403 WARN(1, KERN_ERR "add_uevent_var: buffer size too small\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 return -ENOMEM;
Kay Sievers7eff2e72007-08-14 15:15:12 +0200405 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
Kay Sievers7eff2e72007-08-14 15:15:12 +0200407 env->envp[env->envp_idx++] = &env->buf[env->buflen];
408 env->buflen += len + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 return 0;
410}
Kay Sievers312c0042005-11-16 09:00:00 +0100411EXPORT_SYMBOL_GPL(add_uevent_var);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412
Kay Sievers4d17ffd2006-04-25 15:37:26 +0200413#if defined(CONFIG_NET)
Eric W. Biederman07e98962010-05-04 17:36:44 -0700414static int uevent_net_init(struct net *net)
Kay Sievers5f123fb2005-11-11 14:43:07 +0100415{
Eric W. Biederman07e98962010-05-04 17:36:44 -0700416 struct uevent_sock *ue_sk;
Pablo Neira Ayusoa31f2d12012-06-29 06:15:21 +0000417 struct netlink_kernel_cfg cfg = {
418 .groups = 1,
Pablo Neira Ayuso9785e102012-09-08 02:53:53 +0000419 .flags = NL_CFG_F_NONROOT_RECV,
Pablo Neira Ayusoa31f2d12012-06-29 06:15:21 +0000420 };
Eric W. Biederman07e98962010-05-04 17:36:44 -0700421
422 ue_sk = kzalloc(sizeof(*ue_sk), GFP_KERNEL);
423 if (!ue_sk)
424 return -ENOMEM;
425
Pablo Neira Ayuso9f00d972012-09-08 02:53:54 +0000426 ue_sk->sk = netlink_kernel_create(net, NETLINK_KOBJECT_UEVENT, &cfg);
Eric W. Biederman07e98962010-05-04 17:36:44 -0700427 if (!ue_sk->sk) {
Kay Sievers5f123fb2005-11-11 14:43:07 +0100428 printk(KERN_ERR
429 "kobject_uevent: unable to create netlink socket!\n");
Dan Carpenter743db2d2010-05-25 11:51:10 +0200430 kfree(ue_sk);
Kay Sievers5f123fb2005-11-11 14:43:07 +0100431 return -ENODEV;
432 }
Eric W. Biederman07e98962010-05-04 17:36:44 -0700433 mutex_lock(&uevent_sock_mutex);
434 list_add_tail(&ue_sk->list, &uevent_sock_list);
435 mutex_unlock(&uevent_sock_mutex);
Kay Sievers5f123fb2005-11-11 14:43:07 +0100436 return 0;
437}
438
Eric W. Biederman07e98962010-05-04 17:36:44 -0700439static void uevent_net_exit(struct net *net)
440{
441 struct uevent_sock *ue_sk;
442
443 mutex_lock(&uevent_sock_mutex);
444 list_for_each_entry(ue_sk, &uevent_sock_list, list) {
445 if (sock_net(ue_sk->sk) == net)
446 goto found;
447 }
448 mutex_unlock(&uevent_sock_mutex);
449 return;
450
451found:
452 list_del(&ue_sk->list);
453 mutex_unlock(&uevent_sock_mutex);
454
455 netlink_kernel_release(ue_sk->sk);
456 kfree(ue_sk);
457}
458
459static struct pernet_operations uevent_net_ops = {
460 .init = uevent_net_init,
461 .exit = uevent_net_exit,
462};
463
464static int __init kobject_uevent_init(void)
465{
Eric W. Biederman07e98962010-05-04 17:36:44 -0700466 return register_pernet_subsys(&uevent_net_ops);
467}
468
469
Kay Sievers5f123fb2005-11-11 14:43:07 +0100470postcore_initcall(kobject_uevent_init);
Kay Sievers4d17ffd2006-04-25 15:37:26 +0200471#endif