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> | |
8bc3bcc9 PG |
20 | #include <linux/export.h> |
21 | #include <linux/kmod.h> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
1da177e4 LT |
23 | #include <linux/socket.h> |
24 | #include <linux/skbuff.h> | |
25 | #include <linux/netlink.h> | |
f36776fa PR |
26 | #include <linux/uuid.h> |
27 | #include <linux/ctype.h> | |
1da177e4 | 28 | #include <net/sock.h> |
07e98962 | 29 | #include <net/net_namespace.h> |
1da177e4 | 30 | |
1da177e4 | 31 | |
cd030c4c | 32 | u64 uevent_seqnum; |
86d56134 | 33 | #ifdef CONFIG_UEVENT_HELPER |
6a8d8abb | 34 | char uevent_helper[UEVENT_HELPER_PATH_LEN] = CONFIG_UEVENT_HELPER_PATH; |
86d56134 | 35 | #endif |
07e98962 EB |
36 | #ifdef CONFIG_NET |
37 | struct uevent_sock { | |
38 | struct list_head list; | |
39 | struct sock *sk; | |
40 | }; | |
41 | static LIST_HEAD(uevent_sock_list); | |
cd030c4c CH |
42 | #endif |
43 | ||
7b60a18d AV |
44 | /* This lock protects uevent_seqnum and uevent_sock_list */ |
45 | static DEFINE_MUTEX(uevent_sock_mutex); | |
46 | ||
5c5daf65 KS |
47 | /* the strings here must match the enum in include/linux/kobject.h */ |
48 | static const char *kobject_actions[] = { | |
49 | [KOBJ_ADD] = "add", | |
50 | [KOBJ_REMOVE] = "remove", | |
51 | [KOBJ_CHANGE] = "change", | |
52 | [KOBJ_MOVE] = "move", | |
53 | [KOBJ_ONLINE] = "online", | |
54 | [KOBJ_OFFLINE] = "offline", | |
55 | }; | |
56 | ||
f36776fa PR |
57 | static int kobject_action_type(const char *buf, size_t count, |
58 | enum kobject_action *type, | |
59 | const char **args) | |
5c5daf65 KS |
60 | { |
61 | enum kobject_action action; | |
f36776fa PR |
62 | size_t count_first; |
63 | const char *args_start; | |
5c5daf65 KS |
64 | int ret = -EINVAL; |
65 | ||
a9edadbf | 66 | if (count && (buf[count-1] == '\n' || buf[count-1] == '\0')) |
5c5daf65 KS |
67 | count--; |
68 | ||
69 | if (!count) | |
70 | goto out; | |
71 | ||
f36776fa PR |
72 | args_start = strnchr(buf, count, ' '); |
73 | if (args_start) { | |
74 | count_first = args_start - buf; | |
75 | args_start = args_start + 1; | |
76 | } else | |
77 | count_first = count; | |
78 | ||
5c5daf65 | 79 | for (action = 0; action < ARRAY_SIZE(kobject_actions); action++) { |
f36776fa | 80 | if (strncmp(kobject_actions[action], buf, count_first) != 0) |
5c5daf65 | 81 | continue; |
f36776fa | 82 | if (kobject_actions[action][count_first] != '\0') |
5c5daf65 | 83 | continue; |
f36776fa PR |
84 | if (args) |
85 | *args = args_start; | |
5c5daf65 KS |
86 | *type = action; |
87 | ret = 0; | |
88 | break; | |
89 | } | |
90 | out: | |
91 | return ret; | |
92 | } | |
93 | ||
f36776fa PR |
94 | static const char *action_arg_word_end(const char *buf, const char *buf_end, |
95 | char delim) | |
96 | { | |
97 | const char *next = buf; | |
98 | ||
99 | while (next <= buf_end && *next != delim) | |
100 | if (!isalnum(*next++)) | |
101 | return NULL; | |
102 | ||
103 | if (next == buf) | |
104 | return NULL; | |
105 | ||
106 | return next; | |
107 | } | |
108 | ||
109 | static int kobject_action_args(const char *buf, size_t count, | |
110 | struct kobj_uevent_env **ret_env) | |
111 | { | |
112 | struct kobj_uevent_env *env = NULL; | |
113 | const char *next, *buf_end, *key; | |
114 | int key_len; | |
115 | int r = -EINVAL; | |
116 | ||
117 | if (count && (buf[count - 1] == '\n' || buf[count - 1] == '\0')) | |
118 | count--; | |
119 | ||
120 | if (!count) | |
121 | return -EINVAL; | |
122 | ||
123 | env = kzalloc(sizeof(*env), GFP_KERNEL); | |
124 | if (!env) | |
125 | return -ENOMEM; | |
126 | ||
127 | /* first arg is UUID */ | |
128 | if (count < UUID_STRING_LEN || !uuid_is_valid(buf) || | |
129 | add_uevent_var(env, "SYNTH_UUID=%.*s", UUID_STRING_LEN, buf)) | |
130 | goto out; | |
131 | ||
132 | /* | |
133 | * the rest are custom environment variables in KEY=VALUE | |
134 | * format with ' ' delimiter between each KEY=VALUE pair | |
135 | */ | |
136 | next = buf + UUID_STRING_LEN; | |
137 | buf_end = buf + count - 1; | |
138 | ||
139 | while (next <= buf_end) { | |
140 | if (*next != ' ') | |
141 | goto out; | |
142 | ||
143 | /* skip the ' ', key must follow */ | |
144 | key = ++next; | |
145 | if (key > buf_end) | |
146 | goto out; | |
147 | ||
148 | buf = next; | |
149 | next = action_arg_word_end(buf, buf_end, '='); | |
150 | if (!next || next > buf_end || *next != '=') | |
151 | goto out; | |
152 | key_len = next - buf; | |
153 | ||
154 | /* skip the '=', value must follow */ | |
155 | if (++next > buf_end) | |
156 | goto out; | |
157 | ||
158 | buf = next; | |
159 | next = action_arg_word_end(buf, buf_end, ' '); | |
160 | if (!next) | |
161 | goto out; | |
162 | ||
163 | if (add_uevent_var(env, "SYNTH_ARG_%.*s=%.*s", | |
164 | key_len, key, (int) (next - buf), buf)) | |
165 | goto out; | |
166 | } | |
167 | ||
168 | r = 0; | |
169 | out: | |
170 | if (r) | |
171 | kfree(env); | |
172 | else | |
173 | *ret_env = env; | |
174 | return r; | |
175 | } | |
176 | ||
177 | /** | |
178 | * kobject_synth_uevent - send synthetic uevent with arguments | |
179 | * | |
180 | * @kobj: struct kobject for which synthetic uevent is to be generated | |
181 | * @buf: buffer containing action type and action args, newline is ignored | |
182 | * @count: length of buffer | |
183 | * | |
184 | * Returns 0 if kobject_synthetic_uevent() is completed with success or the | |
185 | * corresponding error when it fails. | |
186 | */ | |
187 | int kobject_synth_uevent(struct kobject *kobj, const char *buf, size_t count) | |
188 | { | |
189 | char *no_uuid_envp[] = { "SYNTH_UUID=0", NULL }; | |
190 | enum kobject_action action; | |
191 | const char *action_args; | |
192 | struct kobj_uevent_env *env; | |
193 | const char *msg = NULL, *devpath; | |
194 | int r; | |
195 | ||
196 | r = kobject_action_type(buf, count, &action, &action_args); | |
197 | if (r) { | |
198 | msg = "unknown uevent action string\n"; | |
199 | goto out; | |
200 | } | |
201 | ||
202 | if (!action_args) { | |
203 | r = kobject_uevent_env(kobj, action, no_uuid_envp); | |
204 | goto out; | |
205 | } | |
206 | ||
207 | r = kobject_action_args(action_args, | |
208 | count - (action_args - buf), &env); | |
209 | if (r == -EINVAL) { | |
210 | msg = "incorrect uevent action arguments\n"; | |
211 | goto out; | |
212 | } | |
213 | ||
214 | if (r) | |
215 | goto out; | |
216 | ||
217 | r = kobject_uevent_env(kobj, action, env->envp); | |
218 | kfree(env); | |
219 | out: | |
220 | if (r) { | |
221 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
222 | printk(KERN_WARNING "synth uevent: %s: %s", | |
223 | devpath ?: "unknown device", | |
224 | msg ?: "failed to send uevent"); | |
225 | kfree(devpath); | |
226 | } | |
227 | return r; | |
228 | } | |
229 | ||
c8421286 | 230 | #ifdef CONFIG_NET |
5f71a296 EB |
231 | static int kobj_bcast_filter(struct sock *dsk, struct sk_buff *skb, void *data) |
232 | { | |
82ef3d5d | 233 | struct kobject *kobj = data, *ksobj; |
5f71a296 EB |
234 | const struct kobj_ns_type_operations *ops; |
235 | ||
236 | ops = kobj_ns_ops(kobj); | |
82ef3d5d WC |
237 | if (!ops && kobj->kset) { |
238 | ksobj = &kobj->kset->kobj; | |
239 | if (ksobj->parent != NULL) | |
240 | ops = kobj_ns_ops(ksobj->parent); | |
241 | } | |
242 | ||
243 | if (ops && ops->netlink_ns && kobj->ktype->namespace) { | |
5f71a296 EB |
244 | const void *sock_ns, *ns; |
245 | ns = kobj->ktype->namespace(kobj); | |
246 | sock_ns = ops->netlink_ns(dsk); | |
247 | return sock_ns != ns; | |
248 | } | |
249 | ||
250 | return 0; | |
251 | } | |
c8421286 | 252 | #endif |
5f71a296 | 253 | |
86d56134 | 254 | #ifdef CONFIG_UEVENT_HELPER |
417daa1e EB |
255 | static int kobj_usermode_filter(struct kobject *kobj) |
256 | { | |
257 | const struct kobj_ns_type_operations *ops; | |
258 | ||
259 | ops = kobj_ns_ops(kobj); | |
260 | if (ops) { | |
261 | const void *init_ns, *ns; | |
262 | ns = kobj->ktype->namespace(kobj); | |
263 | init_ns = ops->initial_ns(); | |
264 | return ns != init_ns; | |
265 | } | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
bcccff93 VD |
270 | static int init_uevent_argv(struct kobj_uevent_env *env, const char *subsystem) |
271 | { | |
272 | int len; | |
273 | ||
274 | len = strlcpy(&env->buf[env->buflen], subsystem, | |
275 | sizeof(env->buf) - env->buflen); | |
276 | if (len >= (sizeof(env->buf) - env->buflen)) { | |
277 | WARN(1, KERN_ERR "init_uevent_argv: buffer size too small\n"); | |
278 | return -ENOMEM; | |
279 | } | |
280 | ||
281 | env->argv[0] = uevent_helper; | |
282 | env->argv[1] = &env->buf[env->buflen]; | |
283 | env->argv[2] = NULL; | |
284 | ||
285 | env->buflen += len + 1; | |
286 | return 0; | |
287 | } | |
288 | ||
289 | static void cleanup_uevent_env(struct subprocess_info *info) | |
290 | { | |
291 | kfree(info->data); | |
292 | } | |
86d56134 | 293 | #endif |
bcccff93 | 294 | |
1da177e4 | 295 | /** |
8a82472f | 296 | * kobject_uevent_env - send an uevent with environmental data |
1da177e4 | 297 | * |
1da177e4 | 298 | * @kobj: struct kobject that the action is happening to |
edbbf994 | 299 | * @action: action that is happening |
8a82472f | 300 | * @envp_ext: pointer to environmental data |
542cfce6 | 301 | * |
f6e6e779 | 302 | * Returns 0 if kobject_uevent_env() is completed with success or the |
542cfce6 | 303 | * corresponding error when it fails. |
1da177e4 | 304 | */ |
542cfce6 | 305 | int kobject_uevent_env(struct kobject *kobj, enum kobject_action action, |
7eff2e7a | 306 | char *envp_ext[]) |
1da177e4 | 307 | { |
7eff2e7a KS |
308 | struct kobj_uevent_env *env; |
309 | const char *action_string = kobject_actions[action]; | |
5f123fbd KS |
310 | const char *devpath = NULL; |
311 | const char *subsystem; | |
312 | struct kobject *top_kobj; | |
313 | struct kset *kset; | |
9cd43611 | 314 | const struct kset_uevent_ops *uevent_ops; |
1da177e4 | 315 | int i = 0; |
542cfce6 | 316 | int retval = 0; |
07e98962 EB |
317 | #ifdef CONFIG_NET |
318 | struct uevent_sock *ue_sk; | |
319 | #endif | |
1da177e4 | 320 | |
9f66fa2a | 321 | pr_debug("kobject: '%s' (%p): %s\n", |
810304db | 322 | kobject_name(kobj), kobj, __func__); |
5f123fbd | 323 | |
5f123fbd KS |
324 | /* search the kset we belong to */ |
325 | top_kobj = kobj; | |
ccd490a3 | 326 | while (!top_kobj->kset && top_kobj->parent) |
14193fb9 | 327 | top_kobj = top_kobj->parent; |
ccd490a3 | 328 | |
542cfce6 | 329 | if (!top_kobj->kset) { |
9f66fa2a GKH |
330 | pr_debug("kobject: '%s' (%p): %s: attempted to send uevent " |
331 | "without kset!\n", kobject_name(kobj), kobj, | |
810304db | 332 | __func__); |
542cfce6 AK |
333 | return -EINVAL; |
334 | } | |
1da177e4 | 335 | |
5f123fbd | 336 | kset = top_kobj->kset; |
312c004d | 337 | uevent_ops = kset->uevent_ops; |
1da177e4 | 338 | |
f67f129e ML |
339 | /* skip the event, if uevent_suppress is set*/ |
340 | if (kobj->uevent_suppress) { | |
341 | pr_debug("kobject: '%s' (%p): %s: uevent_suppress " | |
342 | "caused the event to drop!\n", | |
343 | kobject_name(kobj), kobj, __func__); | |
344 | return 0; | |
345 | } | |
7eff2e7a | 346 | /* skip the event, if the filter returns zero. */ |
312c004d | 347 | if (uevent_ops && uevent_ops->filter) |
542cfce6 | 348 | if (!uevent_ops->filter(kset, kobj)) { |
9f66fa2a GKH |
349 | pr_debug("kobject: '%s' (%p): %s: filter function " |
350 | "caused the event to drop!\n", | |
810304db | 351 | kobject_name(kobj), kobj, __func__); |
542cfce6 AK |
352 | return 0; |
353 | } | |
1da177e4 | 354 | |
86406245 KS |
355 | /* originating subsystem */ |
356 | if (uevent_ops && uevent_ops->name) | |
357 | subsystem = uevent_ops->name(kset, kobj); | |
358 | else | |
359 | subsystem = kobject_name(&kset->kobj); | |
360 | if (!subsystem) { | |
9f66fa2a GKH |
361 | pr_debug("kobject: '%s' (%p): %s: unset subsystem caused the " |
362 | "event to drop!\n", kobject_name(kobj), kobj, | |
810304db | 363 | __func__); |
86406245 KS |
364 | return 0; |
365 | } | |
366 | ||
7eff2e7a KS |
367 | /* environment buffer */ |
368 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); | |
369 | if (!env) | |
542cfce6 | 370 | return -ENOMEM; |
1da177e4 | 371 | |
5f123fbd KS |
372 | /* complete object path */ |
373 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
542cfce6 AK |
374 | if (!devpath) { |
375 | retval = -ENOENT; | |
5f123fbd | 376 | goto exit; |
542cfce6 | 377 | } |
1da177e4 | 378 | |
5f123fbd | 379 | /* default keys */ |
7eff2e7a KS |
380 | retval = add_uevent_var(env, "ACTION=%s", action_string); |
381 | if (retval) | |
382 | goto exit; | |
383 | retval = add_uevent_var(env, "DEVPATH=%s", devpath); | |
384 | if (retval) | |
385 | goto exit; | |
386 | retval = add_uevent_var(env, "SUBSYSTEM=%s", subsystem); | |
387 | if (retval) | |
388 | goto exit; | |
389 | ||
390 | /* keys passed in from the caller */ | |
391 | if (envp_ext) { | |
392 | for (i = 0; envp_ext[i]; i++) { | |
c65b9145 | 393 | retval = add_uevent_var(env, "%s", envp_ext[i]); |
7eff2e7a KS |
394 | if (retval) |
395 | goto exit; | |
396 | } | |
397 | } | |
1da177e4 | 398 | |
5f123fbd | 399 | /* let the kset specific function add its stuff */ |
312c004d | 400 | if (uevent_ops && uevent_ops->uevent) { |
7eff2e7a | 401 | retval = uevent_ops->uevent(kset, kobj, env); |
1da177e4 | 402 | if (retval) { |
9f66fa2a GKH |
403 | pr_debug("kobject: '%s' (%p): %s: uevent() returned " |
404 | "%d\n", kobject_name(kobj), kobj, | |
810304db | 405 | __func__, retval); |
1da177e4 LT |
406 | goto exit; |
407 | } | |
408 | } | |
409 | ||
0f4dafc0 KS |
410 | /* |
411 | * Mark "add" and "remove" events in the object to ensure proper | |
412 | * events to userspace during automatic cleanup. If the object did | |
413 | * send an "add" event, "remove" will automatically generated by | |
414 | * the core, if not already done by the caller. | |
415 | */ | |
416 | if (action == KOBJ_ADD) | |
417 | kobj->state_add_uevent_sent = 1; | |
418 | else if (action == KOBJ_REMOVE) | |
419 | kobj->state_remove_uevent_sent = 1; | |
420 | ||
7b60a18d | 421 | mutex_lock(&uevent_sock_mutex); |
7eff2e7a | 422 | /* we will send an event, so request a new sequence number */ |
7b60a18d AV |
423 | retval = add_uevent_var(env, "SEQNUM=%llu", (unsigned long long)++uevent_seqnum); |
424 | if (retval) { | |
425 | mutex_unlock(&uevent_sock_mutex); | |
7eff2e7a | 426 | goto exit; |
7b60a18d | 427 | } |
1da177e4 | 428 | |
4d17ffda | 429 | #if defined(CONFIG_NET) |
5f123fbd | 430 | /* send netlink message */ |
07e98962 EB |
431 | list_for_each_entry(ue_sk, &uevent_sock_list, list) { |
432 | struct sock *uevent_sock = ue_sk->sk; | |
5f123fbd KS |
433 | struct sk_buff *skb; |
434 | size_t len; | |
435 | ||
74099b18 KS |
436 | if (!netlink_has_listeners(uevent_sock, 1)) |
437 | continue; | |
438 | ||
5f123fbd KS |
439 | /* allocate message with the maximum possible size */ |
440 | len = strlen(action_string) + strlen(devpath) + 2; | |
7eff2e7a | 441 | skb = alloc_skb(len + env->buflen, GFP_KERNEL); |
5f123fbd | 442 | if (skb) { |
7eff2e7a KS |
443 | char *scratch; |
444 | ||
5f123fbd KS |
445 | /* add header */ |
446 | scratch = skb_put(skb, len); | |
447 | sprintf(scratch, "%s@%s", action_string, devpath); | |
448 | ||
449 | /* copy keys to our continuous event payload buffer */ | |
7eff2e7a KS |
450 | for (i = 0; i < env->envp_idx; i++) { |
451 | len = strlen(env->envp[i]) + 1; | |
5f123fbd | 452 | scratch = skb_put(skb, len); |
7eff2e7a | 453 | strcpy(scratch, env->envp[i]); |
5f123fbd KS |
454 | } |
455 | ||
456 | NETLINK_CB(skb).dst_group = 1; | |
5f71a296 EB |
457 | retval = netlink_broadcast_filtered(uevent_sock, skb, |
458 | 0, 1, GFP_KERNEL, | |
459 | kobj_bcast_filter, | |
460 | kobj); | |
ff491a73 | 461 | /* ENOBUFS should be handled in userspace */ |
ebf4127c | 462 | if (retval == -ENOBUFS || retval == -ESRCH) |
ff491a73 | 463 | retval = 0; |
e0d7bf5d ML |
464 | } else |
465 | retval = -ENOMEM; | |
5f123fbd | 466 | } |
4d17ffda | 467 | #endif |
7b60a18d | 468 | mutex_unlock(&uevent_sock_mutex); |
1da177e4 | 469 | |
86d56134 | 470 | #ifdef CONFIG_UEVENT_HELPER |
5f123fbd | 471 | /* call uevent_helper, usually only enabled during early boot */ |
417daa1e | 472 | if (uevent_helper[0] && !kobj_usermode_filter(kobj)) { |
bcccff93 | 473 | struct subprocess_info *info; |
1da177e4 | 474 | |
7eff2e7a KS |
475 | retval = add_uevent_var(env, "HOME=/"); |
476 | if (retval) | |
477 | goto exit; | |
e374a2bf GKH |
478 | retval = add_uevent_var(env, |
479 | "PATH=/sbin:/bin:/usr/sbin:/usr/bin"); | |
7eff2e7a KS |
480 | if (retval) |
481 | goto exit; | |
bcccff93 VD |
482 | retval = init_uevent_argv(env, subsystem); |
483 | if (retval) | |
484 | goto exit; | |
7eff2e7a | 485 | |
bcccff93 VD |
486 | retval = -ENOMEM; |
487 | info = call_usermodehelper_setup(env->argv[0], env->argv, | |
488 | env->envp, GFP_KERNEL, | |
489 | NULL, cleanup_uevent_env, env); | |
490 | if (info) { | |
491 | retval = call_usermodehelper_exec(info, UMH_NO_WAIT); | |
492 | env = NULL; /* freed by cleanup_uevent_env */ | |
493 | } | |
5f123fbd | 494 | } |
86d56134 | 495 | #endif |
1da177e4 LT |
496 | |
497 | exit: | |
5f123fbd | 498 | kfree(devpath); |
7eff2e7a | 499 | kfree(env); |
542cfce6 | 500 | return retval; |
1da177e4 | 501 | } |
8a82472f CH |
502 | EXPORT_SYMBOL_GPL(kobject_uevent_env); |
503 | ||
504 | /** | |
f6e6e779 | 505 | * kobject_uevent - notify userspace by sending an uevent |
8a82472f | 506 | * |
8a82472f | 507 | * @kobj: struct kobject that the action is happening to |
edbbf994 | 508 | * @action: action that is happening |
542cfce6 AK |
509 | * |
510 | * Returns 0 if kobject_uevent() is completed with success or the | |
511 | * corresponding error when it fails. | |
8a82472f | 512 | */ |
542cfce6 | 513 | int kobject_uevent(struct kobject *kobj, enum kobject_action action) |
8a82472f | 514 | { |
542cfce6 | 515 | return kobject_uevent_env(kobj, action, NULL); |
8a82472f | 516 | } |
312c004d | 517 | EXPORT_SYMBOL_GPL(kobject_uevent); |
1da177e4 LT |
518 | |
519 | /** | |
7eff2e7a KS |
520 | * add_uevent_var - add key value string to the environment buffer |
521 | * @env: environment buffer structure | |
522 | * @format: printf format for the key=value pair | |
1da177e4 LT |
523 | * |
524 | * Returns 0 if environment variable was added successfully or -ENOMEM | |
525 | * if no space was available. | |
526 | */ | |
7eff2e7a | 527 | int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...) |
1da177e4 LT |
528 | { |
529 | va_list args; | |
7eff2e7a | 530 | int len; |
1da177e4 | 531 | |
7eff2e7a | 532 | if (env->envp_idx >= ARRAY_SIZE(env->envp)) { |
5cd2b459 | 533 | WARN(1, KERN_ERR "add_uevent_var: too many keys\n"); |
1da177e4 | 534 | return -ENOMEM; |
7eff2e7a | 535 | } |
1da177e4 LT |
536 | |
537 | va_start(args, format); | |
7eff2e7a KS |
538 | len = vsnprintf(&env->buf[env->buflen], |
539 | sizeof(env->buf) - env->buflen, | |
540 | format, args); | |
1da177e4 LT |
541 | va_end(args); |
542 | ||
7eff2e7a | 543 | if (len >= (sizeof(env->buf) - env->buflen)) { |
5cd2b459 | 544 | WARN(1, KERN_ERR "add_uevent_var: buffer size too small\n"); |
1da177e4 | 545 | return -ENOMEM; |
7eff2e7a | 546 | } |
1da177e4 | 547 | |
7eff2e7a KS |
548 | env->envp[env->envp_idx++] = &env->buf[env->buflen]; |
549 | env->buflen += len + 1; | |
1da177e4 LT |
550 | return 0; |
551 | } | |
312c004d | 552 | EXPORT_SYMBOL_GPL(add_uevent_var); |
1da177e4 | 553 | |
4d17ffda | 554 | #if defined(CONFIG_NET) |
07e98962 | 555 | static int uevent_net_init(struct net *net) |
5f123fbd | 556 | { |
07e98962 | 557 | struct uevent_sock *ue_sk; |
a31f2d17 PNA |
558 | struct netlink_kernel_cfg cfg = { |
559 | .groups = 1, | |
9785e10a | 560 | .flags = NL_CFG_F_NONROOT_RECV, |
a31f2d17 | 561 | }; |
07e98962 EB |
562 | |
563 | ue_sk = kzalloc(sizeof(*ue_sk), GFP_KERNEL); | |
564 | if (!ue_sk) | |
565 | return -ENOMEM; | |
566 | ||
9f00d977 | 567 | ue_sk->sk = netlink_kernel_create(net, NETLINK_KOBJECT_UEVENT, &cfg); |
07e98962 | 568 | if (!ue_sk->sk) { |
5f123fbd KS |
569 | printk(KERN_ERR |
570 | "kobject_uevent: unable to create netlink socket!\n"); | |
743db2d9 | 571 | kfree(ue_sk); |
5f123fbd KS |
572 | return -ENODEV; |
573 | } | |
07e98962 EB |
574 | mutex_lock(&uevent_sock_mutex); |
575 | list_add_tail(&ue_sk->list, &uevent_sock_list); | |
576 | mutex_unlock(&uevent_sock_mutex); | |
5f123fbd KS |
577 | return 0; |
578 | } | |
579 | ||
07e98962 EB |
580 | static void uevent_net_exit(struct net *net) |
581 | { | |
582 | struct uevent_sock *ue_sk; | |
583 | ||
584 | mutex_lock(&uevent_sock_mutex); | |
585 | list_for_each_entry(ue_sk, &uevent_sock_list, list) { | |
586 | if (sock_net(ue_sk->sk) == net) | |
587 | goto found; | |
588 | } | |
589 | mutex_unlock(&uevent_sock_mutex); | |
590 | return; | |
591 | ||
592 | found: | |
593 | list_del(&ue_sk->list); | |
594 | mutex_unlock(&uevent_sock_mutex); | |
595 | ||
596 | netlink_kernel_release(ue_sk->sk); | |
597 | kfree(ue_sk); | |
598 | } | |
599 | ||
600 | static struct pernet_operations uevent_net_ops = { | |
601 | .init = uevent_net_init, | |
602 | .exit = uevent_net_exit, | |
603 | }; | |
604 | ||
605 | static int __init kobject_uevent_init(void) | |
606 | { | |
07e98962 EB |
607 | return register_pernet_subsys(&uevent_net_ops); |
608 | } | |
609 | ||
610 | ||
5f123fbd | 611 | postcore_initcall(kobject_uevent_init); |
4d17ffda | 612 | #endif |