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Commit | Line | Data |
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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", | |
1455cf8d DT |
55 | [KOBJ_BIND] = "bind", |
56 | [KOBJ_UNBIND] = "unbind", | |
5c5daf65 KS |
57 | }; |
58 | ||
f36776fa PR |
59 | static int kobject_action_type(const char *buf, size_t count, |
60 | enum kobject_action *type, | |
61 | const char **args) | |
5c5daf65 KS |
62 | { |
63 | enum kobject_action action; | |
f36776fa PR |
64 | size_t count_first; |
65 | const char *args_start; | |
5c5daf65 KS |
66 | int ret = -EINVAL; |
67 | ||
a9edadbf | 68 | if (count && (buf[count-1] == '\n' || buf[count-1] == '\0')) |
5c5daf65 KS |
69 | count--; |
70 | ||
71 | if (!count) | |
72 | goto out; | |
73 | ||
f36776fa PR |
74 | args_start = strnchr(buf, count, ' '); |
75 | if (args_start) { | |
76 | count_first = args_start - buf; | |
77 | args_start = args_start + 1; | |
78 | } else | |
79 | count_first = count; | |
80 | ||
5c5daf65 | 81 | for (action = 0; action < ARRAY_SIZE(kobject_actions); action++) { |
f36776fa | 82 | if (strncmp(kobject_actions[action], buf, count_first) != 0) |
5c5daf65 | 83 | continue; |
f36776fa | 84 | if (kobject_actions[action][count_first] != '\0') |
5c5daf65 | 85 | continue; |
f36776fa PR |
86 | if (args) |
87 | *args = args_start; | |
5c5daf65 KS |
88 | *type = action; |
89 | ret = 0; | |
90 | break; | |
91 | } | |
92 | out: | |
93 | return ret; | |
94 | } | |
95 | ||
f36776fa PR |
96 | static const char *action_arg_word_end(const char *buf, const char *buf_end, |
97 | char delim) | |
98 | { | |
99 | const char *next = buf; | |
100 | ||
101 | while (next <= buf_end && *next != delim) | |
102 | if (!isalnum(*next++)) | |
103 | return NULL; | |
104 | ||
105 | if (next == buf) | |
106 | return NULL; | |
107 | ||
108 | return next; | |
109 | } | |
110 | ||
111 | static int kobject_action_args(const char *buf, size_t count, | |
112 | struct kobj_uevent_env **ret_env) | |
113 | { | |
114 | struct kobj_uevent_env *env = NULL; | |
115 | const char *next, *buf_end, *key; | |
116 | int key_len; | |
117 | int r = -EINVAL; | |
118 | ||
119 | if (count && (buf[count - 1] == '\n' || buf[count - 1] == '\0')) | |
120 | count--; | |
121 | ||
122 | if (!count) | |
123 | return -EINVAL; | |
124 | ||
125 | env = kzalloc(sizeof(*env), GFP_KERNEL); | |
126 | if (!env) | |
127 | return -ENOMEM; | |
128 | ||
129 | /* first arg is UUID */ | |
130 | if (count < UUID_STRING_LEN || !uuid_is_valid(buf) || | |
131 | add_uevent_var(env, "SYNTH_UUID=%.*s", UUID_STRING_LEN, buf)) | |
132 | goto out; | |
133 | ||
134 | /* | |
135 | * the rest are custom environment variables in KEY=VALUE | |
136 | * format with ' ' delimiter between each KEY=VALUE pair | |
137 | */ | |
138 | next = buf + UUID_STRING_LEN; | |
139 | buf_end = buf + count - 1; | |
140 | ||
141 | while (next <= buf_end) { | |
142 | if (*next != ' ') | |
143 | goto out; | |
144 | ||
145 | /* skip the ' ', key must follow */ | |
146 | key = ++next; | |
147 | if (key > buf_end) | |
148 | goto out; | |
149 | ||
150 | buf = next; | |
151 | next = action_arg_word_end(buf, buf_end, '='); | |
152 | if (!next || next > buf_end || *next != '=') | |
153 | goto out; | |
154 | key_len = next - buf; | |
155 | ||
156 | /* skip the '=', value must follow */ | |
157 | if (++next > buf_end) | |
158 | goto out; | |
159 | ||
160 | buf = next; | |
161 | next = action_arg_word_end(buf, buf_end, ' '); | |
162 | if (!next) | |
163 | goto out; | |
164 | ||
165 | if (add_uevent_var(env, "SYNTH_ARG_%.*s=%.*s", | |
166 | key_len, key, (int) (next - buf), buf)) | |
167 | goto out; | |
168 | } | |
169 | ||
170 | r = 0; | |
171 | out: | |
172 | if (r) | |
173 | kfree(env); | |
174 | else | |
175 | *ret_env = env; | |
176 | return r; | |
177 | } | |
178 | ||
179 | /** | |
180 | * kobject_synth_uevent - send synthetic uevent with arguments | |
181 | * | |
182 | * @kobj: struct kobject for which synthetic uevent is to be generated | |
183 | * @buf: buffer containing action type and action args, newline is ignored | |
184 | * @count: length of buffer | |
185 | * | |
186 | * Returns 0 if kobject_synthetic_uevent() is completed with success or the | |
187 | * corresponding error when it fails. | |
188 | */ | |
189 | int kobject_synth_uevent(struct kobject *kobj, const char *buf, size_t count) | |
190 | { | |
191 | char *no_uuid_envp[] = { "SYNTH_UUID=0", NULL }; | |
192 | enum kobject_action action; | |
193 | const char *action_args; | |
194 | struct kobj_uevent_env *env; | |
195 | const char *msg = NULL, *devpath; | |
196 | int r; | |
197 | ||
198 | r = kobject_action_type(buf, count, &action, &action_args); | |
199 | if (r) { | |
200 | msg = "unknown uevent action string\n"; | |
201 | goto out; | |
202 | } | |
203 | ||
204 | if (!action_args) { | |
205 | r = kobject_uevent_env(kobj, action, no_uuid_envp); | |
206 | goto out; | |
207 | } | |
208 | ||
209 | r = kobject_action_args(action_args, | |
210 | count - (action_args - buf), &env); | |
211 | if (r == -EINVAL) { | |
212 | msg = "incorrect uevent action arguments\n"; | |
213 | goto out; | |
214 | } | |
215 | ||
216 | if (r) | |
217 | goto out; | |
218 | ||
219 | r = kobject_uevent_env(kobj, action, env->envp); | |
220 | kfree(env); | |
221 | out: | |
222 | if (r) { | |
223 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
224 | printk(KERN_WARNING "synth uevent: %s: %s", | |
225 | devpath ?: "unknown device", | |
226 | msg ?: "failed to send uevent"); | |
227 | kfree(devpath); | |
228 | } | |
229 | return r; | |
230 | } | |
231 | ||
c8421286 | 232 | #ifdef CONFIG_NET |
5f71a296 EB |
233 | static int kobj_bcast_filter(struct sock *dsk, struct sk_buff *skb, void *data) |
234 | { | |
82ef3d5d | 235 | struct kobject *kobj = data, *ksobj; |
5f71a296 EB |
236 | const struct kobj_ns_type_operations *ops; |
237 | ||
238 | ops = kobj_ns_ops(kobj); | |
82ef3d5d WC |
239 | if (!ops && kobj->kset) { |
240 | ksobj = &kobj->kset->kobj; | |
241 | if (ksobj->parent != NULL) | |
242 | ops = kobj_ns_ops(ksobj->parent); | |
243 | } | |
244 | ||
245 | if (ops && ops->netlink_ns && kobj->ktype->namespace) { | |
5f71a296 EB |
246 | const void *sock_ns, *ns; |
247 | ns = kobj->ktype->namespace(kobj); | |
248 | sock_ns = ops->netlink_ns(dsk); | |
249 | return sock_ns != ns; | |
250 | } | |
251 | ||
252 | return 0; | |
253 | } | |
c8421286 | 254 | #endif |
5f71a296 | 255 | |
86d56134 | 256 | #ifdef CONFIG_UEVENT_HELPER |
417daa1e EB |
257 | static int kobj_usermode_filter(struct kobject *kobj) |
258 | { | |
259 | const struct kobj_ns_type_operations *ops; | |
260 | ||
261 | ops = kobj_ns_ops(kobj); | |
262 | if (ops) { | |
263 | const void *init_ns, *ns; | |
264 | ns = kobj->ktype->namespace(kobj); | |
265 | init_ns = ops->initial_ns(); | |
266 | return ns != init_ns; | |
267 | } | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
bcccff93 VD |
272 | static int init_uevent_argv(struct kobj_uevent_env *env, const char *subsystem) |
273 | { | |
274 | int len; | |
275 | ||
276 | len = strlcpy(&env->buf[env->buflen], subsystem, | |
277 | sizeof(env->buf) - env->buflen); | |
278 | if (len >= (sizeof(env->buf) - env->buflen)) { | |
279 | WARN(1, KERN_ERR "init_uevent_argv: buffer size too small\n"); | |
280 | return -ENOMEM; | |
281 | } | |
282 | ||
283 | env->argv[0] = uevent_helper; | |
284 | env->argv[1] = &env->buf[env->buflen]; | |
285 | env->argv[2] = NULL; | |
286 | ||
287 | env->buflen += len + 1; | |
288 | return 0; | |
289 | } | |
290 | ||
291 | static void cleanup_uevent_env(struct subprocess_info *info) | |
292 | { | |
293 | kfree(info->data); | |
294 | } | |
86d56134 | 295 | #endif |
bcccff93 | 296 | |
16dff336 ED |
297 | static int kobject_uevent_net_broadcast(struct kobject *kobj, |
298 | struct kobj_uevent_env *env, | |
299 | const char *action_string, | |
300 | const char *devpath) | |
301 | { | |
302 | int retval = 0; | |
303 | #if defined(CONFIG_NET) | |
d464e84e | 304 | struct sk_buff *skb = NULL; |
16dff336 ED |
305 | struct uevent_sock *ue_sk; |
306 | ||
307 | /* send netlink message */ | |
308 | list_for_each_entry(ue_sk, &uevent_sock_list, list) { | |
309 | struct sock *uevent_sock = ue_sk->sk; | |
16dff336 ED |
310 | |
311 | if (!netlink_has_listeners(uevent_sock, 1)) | |
312 | continue; | |
313 | ||
d464e84e ED |
314 | if (!skb) { |
315 | /* allocate message with the maximum possible size */ | |
316 | size_t len = strlen(action_string) + strlen(devpath) + 2; | |
16dff336 | 317 | char *scratch; |
16dff336 | 318 | |
d464e84e ED |
319 | retval = -ENOMEM; |
320 | skb = alloc_skb(len + env->buflen, GFP_KERNEL); | |
321 | if (!skb) | |
322 | continue; | |
323 | ||
16dff336 ED |
324 | /* add header */ |
325 | scratch = skb_put(skb, len); | |
326 | sprintf(scratch, "%s@%s", action_string, devpath); | |
327 | ||
4a336a23 | 328 | skb_put_data(skb, env->buf, env->buflen); |
16dff336 ED |
329 | |
330 | NETLINK_CB(skb).dst_group = 1; | |
d464e84e ED |
331 | } |
332 | ||
333 | retval = netlink_broadcast_filtered(uevent_sock, skb_get(skb), | |
334 | 0, 1, GFP_KERNEL, | |
335 | kobj_bcast_filter, | |
336 | kobj); | |
337 | /* ENOBUFS should be handled in userspace */ | |
338 | if (retval == -ENOBUFS || retval == -ESRCH) | |
339 | retval = 0; | |
16dff336 | 340 | } |
d464e84e | 341 | consume_skb(skb); |
16dff336 ED |
342 | #endif |
343 | return retval; | |
344 | } | |
345 | ||
1da177e4 | 346 | /** |
8a82472f | 347 | * kobject_uevent_env - send an uevent with environmental data |
1da177e4 | 348 | * |
1da177e4 | 349 | * @kobj: struct kobject that the action is happening to |
edbbf994 | 350 | * @action: action that is happening |
8a82472f | 351 | * @envp_ext: pointer to environmental data |
542cfce6 | 352 | * |
f6e6e779 | 353 | * Returns 0 if kobject_uevent_env() is completed with success or the |
542cfce6 | 354 | * corresponding error when it fails. |
1da177e4 | 355 | */ |
542cfce6 | 356 | int kobject_uevent_env(struct kobject *kobj, enum kobject_action action, |
7eff2e7a | 357 | char *envp_ext[]) |
1da177e4 | 358 | { |
7eff2e7a KS |
359 | struct kobj_uevent_env *env; |
360 | const char *action_string = kobject_actions[action]; | |
5f123fbd KS |
361 | const char *devpath = NULL; |
362 | const char *subsystem; | |
363 | struct kobject *top_kobj; | |
364 | struct kset *kset; | |
9cd43611 | 365 | const struct kset_uevent_ops *uevent_ops; |
1da177e4 | 366 | int i = 0; |
542cfce6 | 367 | int retval = 0; |
1da177e4 | 368 | |
9f66fa2a | 369 | pr_debug("kobject: '%s' (%p): %s\n", |
810304db | 370 | kobject_name(kobj), kobj, __func__); |
5f123fbd | 371 | |
5f123fbd KS |
372 | /* search the kset we belong to */ |
373 | top_kobj = kobj; | |
ccd490a3 | 374 | while (!top_kobj->kset && top_kobj->parent) |
14193fb9 | 375 | top_kobj = top_kobj->parent; |
ccd490a3 | 376 | |
542cfce6 | 377 | if (!top_kobj->kset) { |
9f66fa2a GKH |
378 | pr_debug("kobject: '%s' (%p): %s: attempted to send uevent " |
379 | "without kset!\n", kobject_name(kobj), kobj, | |
810304db | 380 | __func__); |
542cfce6 AK |
381 | return -EINVAL; |
382 | } | |
1da177e4 | 383 | |
5f123fbd | 384 | kset = top_kobj->kset; |
312c004d | 385 | uevent_ops = kset->uevent_ops; |
1da177e4 | 386 | |
f67f129e ML |
387 | /* skip the event, if uevent_suppress is set*/ |
388 | if (kobj->uevent_suppress) { | |
389 | pr_debug("kobject: '%s' (%p): %s: uevent_suppress " | |
390 | "caused the event to drop!\n", | |
391 | kobject_name(kobj), kobj, __func__); | |
392 | return 0; | |
393 | } | |
7eff2e7a | 394 | /* skip the event, if the filter returns zero. */ |
312c004d | 395 | if (uevent_ops && uevent_ops->filter) |
542cfce6 | 396 | if (!uevent_ops->filter(kset, kobj)) { |
9f66fa2a GKH |
397 | pr_debug("kobject: '%s' (%p): %s: filter function " |
398 | "caused the event to drop!\n", | |
810304db | 399 | kobject_name(kobj), kobj, __func__); |
542cfce6 AK |
400 | return 0; |
401 | } | |
1da177e4 | 402 | |
86406245 KS |
403 | /* originating subsystem */ |
404 | if (uevent_ops && uevent_ops->name) | |
405 | subsystem = uevent_ops->name(kset, kobj); | |
406 | else | |
407 | subsystem = kobject_name(&kset->kobj); | |
408 | if (!subsystem) { | |
9f66fa2a GKH |
409 | pr_debug("kobject: '%s' (%p): %s: unset subsystem caused the " |
410 | "event to drop!\n", kobject_name(kobj), kobj, | |
810304db | 411 | __func__); |
86406245 KS |
412 | return 0; |
413 | } | |
414 | ||
7eff2e7a KS |
415 | /* environment buffer */ |
416 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); | |
417 | if (!env) | |
542cfce6 | 418 | return -ENOMEM; |
1da177e4 | 419 | |
5f123fbd KS |
420 | /* complete object path */ |
421 | devpath = kobject_get_path(kobj, GFP_KERNEL); | |
542cfce6 AK |
422 | if (!devpath) { |
423 | retval = -ENOENT; | |
5f123fbd | 424 | goto exit; |
542cfce6 | 425 | } |
1da177e4 | 426 | |
5f123fbd | 427 | /* default keys */ |
7eff2e7a KS |
428 | retval = add_uevent_var(env, "ACTION=%s", action_string); |
429 | if (retval) | |
430 | goto exit; | |
431 | retval = add_uevent_var(env, "DEVPATH=%s", devpath); | |
432 | if (retval) | |
433 | goto exit; | |
434 | retval = add_uevent_var(env, "SUBSYSTEM=%s", subsystem); | |
435 | if (retval) | |
436 | goto exit; | |
437 | ||
438 | /* keys passed in from the caller */ | |
439 | if (envp_ext) { | |
440 | for (i = 0; envp_ext[i]; i++) { | |
c65b9145 | 441 | retval = add_uevent_var(env, "%s", envp_ext[i]); |
7eff2e7a KS |
442 | if (retval) |
443 | goto exit; | |
444 | } | |
445 | } | |
1da177e4 | 446 | |
5f123fbd | 447 | /* let the kset specific function add its stuff */ |
312c004d | 448 | if (uevent_ops && uevent_ops->uevent) { |
7eff2e7a | 449 | retval = uevent_ops->uevent(kset, kobj, env); |
1da177e4 | 450 | if (retval) { |
9f66fa2a GKH |
451 | pr_debug("kobject: '%s' (%p): %s: uevent() returned " |
452 | "%d\n", kobject_name(kobj), kobj, | |
810304db | 453 | __func__, retval); |
1da177e4 LT |
454 | goto exit; |
455 | } | |
456 | } | |
457 | ||
0f4dafc0 KS |
458 | /* |
459 | * Mark "add" and "remove" events in the object to ensure proper | |
460 | * events to userspace during automatic cleanup. If the object did | |
461 | * send an "add" event, "remove" will automatically generated by | |
462 | * the core, if not already done by the caller. | |
463 | */ | |
464 | if (action == KOBJ_ADD) | |
465 | kobj->state_add_uevent_sent = 1; | |
466 | else if (action == KOBJ_REMOVE) | |
467 | kobj->state_remove_uevent_sent = 1; | |
468 | ||
7b60a18d | 469 | mutex_lock(&uevent_sock_mutex); |
7eff2e7a | 470 | /* we will send an event, so request a new sequence number */ |
7b60a18d AV |
471 | retval = add_uevent_var(env, "SEQNUM=%llu", (unsigned long long)++uevent_seqnum); |
472 | if (retval) { | |
473 | mutex_unlock(&uevent_sock_mutex); | |
7eff2e7a | 474 | goto exit; |
7b60a18d | 475 | } |
16dff336 ED |
476 | retval = kobject_uevent_net_broadcast(kobj, env, action_string, |
477 | devpath); | |
7b60a18d | 478 | mutex_unlock(&uevent_sock_mutex); |
1da177e4 | 479 | |
86d56134 | 480 | #ifdef CONFIG_UEVENT_HELPER |
5f123fbd | 481 | /* call uevent_helper, usually only enabled during early boot */ |
417daa1e | 482 | if (uevent_helper[0] && !kobj_usermode_filter(kobj)) { |
bcccff93 | 483 | struct subprocess_info *info; |
1da177e4 | 484 | |
7eff2e7a KS |
485 | retval = add_uevent_var(env, "HOME=/"); |
486 | if (retval) | |
487 | goto exit; | |
e374a2bf GKH |
488 | retval = add_uevent_var(env, |
489 | "PATH=/sbin:/bin:/usr/sbin:/usr/bin"); | |
7eff2e7a KS |
490 | if (retval) |
491 | goto exit; | |
bcccff93 VD |
492 | retval = init_uevent_argv(env, subsystem); |
493 | if (retval) | |
494 | goto exit; | |
7eff2e7a | 495 | |
bcccff93 VD |
496 | retval = -ENOMEM; |
497 | info = call_usermodehelper_setup(env->argv[0], env->argv, | |
498 | env->envp, GFP_KERNEL, | |
499 | NULL, cleanup_uevent_env, env); | |
500 | if (info) { | |
501 | retval = call_usermodehelper_exec(info, UMH_NO_WAIT); | |
502 | env = NULL; /* freed by cleanup_uevent_env */ | |
503 | } | |
5f123fbd | 504 | } |
86d56134 | 505 | #endif |
1da177e4 LT |
506 | |
507 | exit: | |
5f123fbd | 508 | kfree(devpath); |
7eff2e7a | 509 | kfree(env); |
542cfce6 | 510 | return retval; |
1da177e4 | 511 | } |
8a82472f CH |
512 | EXPORT_SYMBOL_GPL(kobject_uevent_env); |
513 | ||
514 | /** | |
f6e6e779 | 515 | * kobject_uevent - notify userspace by sending an uevent |
8a82472f | 516 | * |
8a82472f | 517 | * @kobj: struct kobject that the action is happening to |
edbbf994 | 518 | * @action: action that is happening |
542cfce6 AK |
519 | * |
520 | * Returns 0 if kobject_uevent() is completed with success or the | |
521 | * corresponding error when it fails. | |
8a82472f | 522 | */ |
542cfce6 | 523 | int kobject_uevent(struct kobject *kobj, enum kobject_action action) |
8a82472f | 524 | { |
542cfce6 | 525 | return kobject_uevent_env(kobj, action, NULL); |
8a82472f | 526 | } |
312c004d | 527 | EXPORT_SYMBOL_GPL(kobject_uevent); |
1da177e4 LT |
528 | |
529 | /** | |
7eff2e7a KS |
530 | * add_uevent_var - add key value string to the environment buffer |
531 | * @env: environment buffer structure | |
532 | * @format: printf format for the key=value pair | |
1da177e4 LT |
533 | * |
534 | * Returns 0 if environment variable was added successfully or -ENOMEM | |
535 | * if no space was available. | |
536 | */ | |
7eff2e7a | 537 | int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...) |
1da177e4 LT |
538 | { |
539 | va_list args; | |
7eff2e7a | 540 | int len; |
1da177e4 | 541 | |
7eff2e7a | 542 | if (env->envp_idx >= ARRAY_SIZE(env->envp)) { |
5cd2b459 | 543 | WARN(1, KERN_ERR "add_uevent_var: too many keys\n"); |
1da177e4 | 544 | return -ENOMEM; |
7eff2e7a | 545 | } |
1da177e4 LT |
546 | |
547 | va_start(args, format); | |
7eff2e7a KS |
548 | len = vsnprintf(&env->buf[env->buflen], |
549 | sizeof(env->buf) - env->buflen, | |
550 | format, args); | |
1da177e4 LT |
551 | va_end(args); |
552 | ||
7eff2e7a | 553 | if (len >= (sizeof(env->buf) - env->buflen)) { |
5cd2b459 | 554 | WARN(1, KERN_ERR "add_uevent_var: buffer size too small\n"); |
1da177e4 | 555 | return -ENOMEM; |
7eff2e7a | 556 | } |
1da177e4 | 557 | |
7eff2e7a KS |
558 | env->envp[env->envp_idx++] = &env->buf[env->buflen]; |
559 | env->buflen += len + 1; | |
1da177e4 LT |
560 | return 0; |
561 | } | |
312c004d | 562 | EXPORT_SYMBOL_GPL(add_uevent_var); |
1da177e4 | 563 | |
4d17ffda | 564 | #if defined(CONFIG_NET) |
07e98962 | 565 | static int uevent_net_init(struct net *net) |
5f123fbd | 566 | { |
07e98962 | 567 | struct uevent_sock *ue_sk; |
a31f2d17 PNA |
568 | struct netlink_kernel_cfg cfg = { |
569 | .groups = 1, | |
9785e10a | 570 | .flags = NL_CFG_F_NONROOT_RECV, |
a31f2d17 | 571 | }; |
07e98962 EB |
572 | |
573 | ue_sk = kzalloc(sizeof(*ue_sk), GFP_KERNEL); | |
574 | if (!ue_sk) | |
575 | return -ENOMEM; | |
576 | ||
9f00d977 | 577 | ue_sk->sk = netlink_kernel_create(net, NETLINK_KOBJECT_UEVENT, &cfg); |
07e98962 | 578 | if (!ue_sk->sk) { |
5f123fbd KS |
579 | printk(KERN_ERR |
580 | "kobject_uevent: unable to create netlink socket!\n"); | |
743db2d9 | 581 | kfree(ue_sk); |
5f123fbd KS |
582 | return -ENODEV; |
583 | } | |
07e98962 EB |
584 | mutex_lock(&uevent_sock_mutex); |
585 | list_add_tail(&ue_sk->list, &uevent_sock_list); | |
586 | mutex_unlock(&uevent_sock_mutex); | |
5f123fbd KS |
587 | return 0; |
588 | } | |
589 | ||
07e98962 EB |
590 | static void uevent_net_exit(struct net *net) |
591 | { | |
592 | struct uevent_sock *ue_sk; | |
593 | ||
594 | mutex_lock(&uevent_sock_mutex); | |
595 | list_for_each_entry(ue_sk, &uevent_sock_list, list) { | |
596 | if (sock_net(ue_sk->sk) == net) | |
597 | goto found; | |
598 | } | |
599 | mutex_unlock(&uevent_sock_mutex); | |
600 | return; | |
601 | ||
602 | found: | |
603 | list_del(&ue_sk->list); | |
604 | mutex_unlock(&uevent_sock_mutex); | |
605 | ||
606 | netlink_kernel_release(ue_sk->sk); | |
607 | kfree(ue_sk); | |
608 | } | |
609 | ||
610 | static struct pernet_operations uevent_net_ops = { | |
611 | .init = uevent_net_init, | |
612 | .exit = uevent_net_exit, | |
613 | }; | |
614 | ||
615 | static int __init kobject_uevent_init(void) | |
616 | { | |
07e98962 EB |
617 | return register_pernet_subsys(&uevent_net_ops); |
618 | } | |
619 | ||
620 | ||
5f123fbd | 621 | postcore_initcall(kobject_uevent_init); |
4d17ffda | 622 | #endif |