Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Denis V. Lunev | 2d38f9a | 2008-03-27 14:26:30 -0700 | [diff] [blame] | 18 | #include <linux/string.h> |
| 19 | #include <linux/kobject.h> |
| 20 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 21 | #include <linux/slab.h> |
Denis V. Lunev | 2d38f9a | 2008-03-27 14:26:30 -0700 | [diff] [blame] | 22 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/socket.h> |
| 24 | #include <linux/skbuff.h> |
| 25 | #include <linux/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <net/sock.h> |
Eric W. Biederman | 07e9896 | 2010-05-04 17:36:44 -0700 | [diff] [blame] | 27 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
Cornelia Huck | cd030c4 | 2007-07-20 13:58:13 +0200 | [diff] [blame] | 30 | u64 uevent_seqnum; |
Kay Sievers | 6a8d8ab | 2007-08-15 15:38:28 +0200 | [diff] [blame] | 31 | char uevent_helper[UEVENT_HELPER_PATH_LEN] = CONFIG_UEVENT_HELPER_PATH; |
Cornelia Huck | cd030c4 | 2007-07-20 13:58:13 +0200 | [diff] [blame] | 32 | static DEFINE_SPINLOCK(sequence_lock); |
Eric W. Biederman | 07e9896 | 2010-05-04 17:36:44 -0700 | [diff] [blame] | 33 | #ifdef CONFIG_NET |
| 34 | struct uevent_sock { |
| 35 | struct list_head list; |
| 36 | struct sock *sk; |
| 37 | }; |
| 38 | static LIST_HEAD(uevent_sock_list); |
| 39 | static DEFINE_MUTEX(uevent_sock_mutex); |
Cornelia Huck | cd030c4 | 2007-07-20 13:58:13 +0200 | [diff] [blame] | 40 | #endif |
| 41 | |
Kay Sievers | 5c5daf6 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 42 | /* the strings here must match the enum in include/linux/kobject.h */ |
| 43 | static 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 | */ |
| 61 | int 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 Lord | a9edadb | 2008-03-28 19:05:25 -0400 | [diff] [blame] | 67 | if (count && (buf[count-1] == '\n' || buf[count-1] == '\0')) |
Kay Sievers | 5c5daf6 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 68 | 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 | } |
| 82 | out: |
| 83 | return ret; |
| 84 | } |
| 85 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | /** |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 87 | * kobject_uevent_env - send an uevent with environmental data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | * |
Kay Sievers | ccd490a | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 89 | * @action: action that is happening |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | * @kobj: struct kobject that the action is happening to |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 91 | * @envp_ext: pointer to environmental data |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 92 | * |
| 93 | * Returns 0 if kobject_uevent() is completed with success or the |
| 94 | * corresponding error when it fails. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | */ |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 96 | int kobject_uevent_env(struct kobject *kobj, enum kobject_action action, |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 97 | char *envp_ext[]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | { |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 99 | struct kobj_uevent_env *env; |
| 100 | const char *action_string = kobject_actions[action]; |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 101 | const char *devpath = NULL; |
| 102 | const char *subsystem; |
| 103 | struct kobject *top_kobj; |
| 104 | struct kset *kset; |
Emese Revfy | 9cd4361 | 2009-12-31 14:52:51 +0100 | [diff] [blame] | 105 | const struct kset_uevent_ops *uevent_ops; |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 106 | u64 seq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | int i = 0; |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 108 | int retval = 0; |
Eric W. Biederman | 07e9896 | 2010-05-04 17:36:44 -0700 | [diff] [blame] | 109 | #ifdef CONFIG_NET |
| 110 | struct uevent_sock *ue_sk; |
| 111 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | |
Greg Kroah-Hartman | 9f66fa2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 113 | pr_debug("kobject: '%s' (%p): %s\n", |
Harvey Harrison | 810304d | 2008-04-30 00:55:08 -0700 | [diff] [blame] | 114 | kobject_name(kobj), kobj, __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 116 | /* search the kset we belong to */ |
| 117 | top_kobj = kobj; |
Kay Sievers | ccd490a | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 118 | while (!top_kobj->kset && top_kobj->parent) |
John Anthony Kazos Jr | 14193fb | 2007-04-04 07:39:17 -0400 | [diff] [blame] | 119 | top_kobj = top_kobj->parent; |
Kay Sievers | ccd490a | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 120 | |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 121 | if (!top_kobj->kset) { |
Greg Kroah-Hartman | 9f66fa2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 122 | pr_debug("kobject: '%s' (%p): %s: attempted to send uevent " |
| 123 | "without kset!\n", kobject_name(kobj), kobj, |
Harvey Harrison | 810304d | 2008-04-30 00:55:08 -0700 | [diff] [blame] | 124 | __func__); |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 125 | return -EINVAL; |
| 126 | } |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 127 | |
| 128 | kset = top_kobj->kset; |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 129 | uevent_ops = kset->uevent_ops; |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 130 | |
Ming Lei | f67f129 | 2009-03-01 21:10:49 +0800 | [diff] [blame] | 131 | /* skip the event, if uevent_suppress is set*/ |
| 132 | if (kobj->uevent_suppress) { |
| 133 | pr_debug("kobject: '%s' (%p): %s: uevent_suppress " |
| 134 | "caused the event to drop!\n", |
| 135 | kobject_name(kobj), kobj, __func__); |
| 136 | return 0; |
| 137 | } |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 138 | /* skip the event, if the filter returns zero. */ |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 139 | if (uevent_ops && uevent_ops->filter) |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 140 | if (!uevent_ops->filter(kset, kobj)) { |
Greg Kroah-Hartman | 9f66fa2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 141 | pr_debug("kobject: '%s' (%p): %s: filter function " |
| 142 | "caused the event to drop!\n", |
Harvey Harrison | 810304d | 2008-04-30 00:55:08 -0700 | [diff] [blame] | 143 | kobject_name(kobj), kobj, __func__); |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 144 | return 0; |
| 145 | } |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 146 | |
Kay Sievers | 8640624 | 2007-03-14 03:25:56 +0100 | [diff] [blame] | 147 | /* originating subsystem */ |
| 148 | if (uevent_ops && uevent_ops->name) |
| 149 | subsystem = uevent_ops->name(kset, kobj); |
| 150 | else |
| 151 | subsystem = kobject_name(&kset->kobj); |
| 152 | if (!subsystem) { |
Greg Kroah-Hartman | 9f66fa2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 153 | pr_debug("kobject: '%s' (%p): %s: unset subsystem caused the " |
| 154 | "event to drop!\n", kobject_name(kobj), kobj, |
Harvey Harrison | 810304d | 2008-04-30 00:55:08 -0700 | [diff] [blame] | 155 | __func__); |
Kay Sievers | 8640624 | 2007-03-14 03:25:56 +0100 | [diff] [blame] | 156 | return 0; |
| 157 | } |
| 158 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 159 | /* environment buffer */ |
| 160 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
| 161 | if (!env) |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 162 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 164 | /* complete object path */ |
| 165 | devpath = kobject_get_path(kobj, GFP_KERNEL); |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 166 | if (!devpath) { |
| 167 | retval = -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | goto exit; |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 169 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 171 | /* default keys */ |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 172 | retval = add_uevent_var(env, "ACTION=%s", action_string); |
| 173 | if (retval) |
| 174 | goto exit; |
| 175 | retval = add_uevent_var(env, "DEVPATH=%s", devpath); |
| 176 | if (retval) |
| 177 | goto exit; |
| 178 | retval = add_uevent_var(env, "SUBSYSTEM=%s", subsystem); |
| 179 | if (retval) |
| 180 | goto exit; |
| 181 | |
| 182 | /* keys passed in from the caller */ |
| 183 | if (envp_ext) { |
| 184 | for (i = 0; envp_ext[i]; i++) { |
Tejun Heo | c65b914 | 2008-11-13 13:20:00 +0900 | [diff] [blame] | 185 | retval = add_uevent_var(env, "%s", envp_ext[i]); |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 186 | if (retval) |
| 187 | goto exit; |
| 188 | } |
| 189 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 191 | /* let the kset specific function add its stuff */ |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 192 | if (uevent_ops && uevent_ops->uevent) { |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 193 | retval = uevent_ops->uevent(kset, kobj, env); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | if (retval) { |
Greg Kroah-Hartman | 9f66fa2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 195 | pr_debug("kobject: '%s' (%p): %s: uevent() returned " |
| 196 | "%d\n", kobject_name(kobj), kobj, |
Harvey Harrison | 810304d | 2008-04-30 00:55:08 -0700 | [diff] [blame] | 197 | __func__, retval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | goto exit; |
| 199 | } |
| 200 | } |
| 201 | |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 202 | /* |
| 203 | * Mark "add" and "remove" events in the object to ensure proper |
| 204 | * events to userspace during automatic cleanup. If the object did |
| 205 | * send an "add" event, "remove" will automatically generated by |
| 206 | * the core, if not already done by the caller. |
| 207 | */ |
| 208 | if (action == KOBJ_ADD) |
| 209 | kobj->state_add_uevent_sent = 1; |
| 210 | else if (action == KOBJ_REMOVE) |
| 211 | kobj->state_remove_uevent_sent = 1; |
| 212 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 213 | /* we will send an event, so request a new sequence number */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | spin_lock(&sequence_lock); |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 215 | seq = ++uevent_seqnum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | spin_unlock(&sequence_lock); |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 217 | retval = add_uevent_var(env, "SEQNUM=%llu", (unsigned long long)seq); |
| 218 | if (retval) |
| 219 | goto exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | |
Kay Sievers | 4d17ffd | 2006-04-25 15:37:26 +0200 | [diff] [blame] | 221 | #if defined(CONFIG_NET) |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 222 | /* send netlink message */ |
Eric W. Biederman | 07e9896 | 2010-05-04 17:36:44 -0700 | [diff] [blame] | 223 | mutex_lock(&uevent_sock_mutex); |
| 224 | list_for_each_entry(ue_sk, &uevent_sock_list, list) { |
| 225 | struct sock *uevent_sock = ue_sk->sk; |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 226 | struct sk_buff *skb; |
| 227 | size_t len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 229 | /* allocate message with the maximum possible size */ |
| 230 | len = strlen(action_string) + strlen(devpath) + 2; |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 231 | skb = alloc_skb(len + env->buflen, GFP_KERNEL); |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 232 | if (skb) { |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 233 | char *scratch; |
| 234 | |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 235 | /* add header */ |
| 236 | scratch = skb_put(skb, len); |
| 237 | sprintf(scratch, "%s@%s", action_string, devpath); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 239 | /* copy keys to our continuous event payload buffer */ |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 240 | for (i = 0; i < env->envp_idx; i++) { |
| 241 | len = strlen(env->envp[i]) + 1; |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 242 | scratch = skb_put(skb, len); |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 243 | strcpy(scratch, env->envp[i]); |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 244 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 246 | NETLINK_CB(skb).dst_group = 1; |
Ming Lei | e0d7bf5 | 2008-11-16 18:23:27 +0800 | [diff] [blame] | 247 | retval = netlink_broadcast(uevent_sock, skb, 0, 1, |
| 248 | GFP_KERNEL); |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 249 | /* ENOBUFS should be handled in userspace */ |
| 250 | if (retval == -ENOBUFS) |
| 251 | retval = 0; |
Ming Lei | e0d7bf5 | 2008-11-16 18:23:27 +0800 | [diff] [blame] | 252 | } else |
| 253 | retval = -ENOMEM; |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 254 | } |
Eric W. Biederman | 07e9896 | 2010-05-04 17:36:44 -0700 | [diff] [blame] | 255 | mutex_unlock(&uevent_sock_mutex); |
Kay Sievers | 4d17ffd | 2006-04-25 15:37:26 +0200 | [diff] [blame] | 256 | #endif |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 257 | |
| 258 | /* call uevent_helper, usually only enabled during early boot */ |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 259 | if (uevent_helper[0]) { |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 260 | char *argv [3]; |
| 261 | |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 262 | argv [0] = uevent_helper; |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 263 | argv [1] = (char *)subsystem; |
| 264 | argv [2] = NULL; |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 265 | retval = add_uevent_var(env, "HOME=/"); |
| 266 | if (retval) |
| 267 | goto exit; |
Greg Kroah-Hartman | e374a2b | 2008-01-24 21:59:04 -0800 | [diff] [blame] | 268 | retval = add_uevent_var(env, |
| 269 | "PATH=/sbin:/bin:/usr/sbin:/usr/bin"); |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 270 | if (retval) |
| 271 | goto exit; |
| 272 | |
Wang Chen | 0ad1d6f | 2008-06-24 16:59:02 +0800 | [diff] [blame] | 273 | retval = call_usermodehelper(argv[0], argv, |
Hugh Dickins | 05f54c1 | 2009-04-16 21:55:29 +0100 | [diff] [blame] | 274 | env->envp, UMH_WAIT_EXEC); |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 275 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | |
| 277 | exit: |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 278 | kfree(devpath); |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 279 | kfree(env); |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 280 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | } |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 282 | EXPORT_SYMBOL_GPL(kobject_uevent_env); |
| 283 | |
| 284 | /** |
| 285 | * kobject_uevent - notify userspace by ending an uevent |
| 286 | * |
Kay Sievers | ccd490a | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 287 | * @action: action that is happening |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 288 | * @kobj: struct kobject that the action is happening to |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 289 | * |
| 290 | * Returns 0 if kobject_uevent() is completed with success or the |
| 291 | * corresponding error when it fails. |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 292 | */ |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 293 | int kobject_uevent(struct kobject *kobj, enum kobject_action action) |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 294 | { |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 295 | return kobject_uevent_env(kobj, action, NULL); |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 296 | } |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 297 | EXPORT_SYMBOL_GPL(kobject_uevent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | |
| 299 | /** |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 300 | * add_uevent_var - add key value string to the environment buffer |
| 301 | * @env: environment buffer structure |
| 302 | * @format: printf format for the key=value pair |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | * |
| 304 | * Returns 0 if environment variable was added successfully or -ENOMEM |
| 305 | * if no space was available. |
| 306 | */ |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 307 | int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | { |
| 309 | va_list args; |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 310 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 312 | if (env->envp_idx >= ARRAY_SIZE(env->envp)) { |
Arjan van de Ven | 5cd2b45 | 2008-07-25 19:45:39 -0700 | [diff] [blame] | 313 | WARN(1, KERN_ERR "add_uevent_var: too many keys\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | return -ENOMEM; |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 315 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | |
| 317 | va_start(args, format); |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 318 | len = vsnprintf(&env->buf[env->buflen], |
| 319 | sizeof(env->buf) - env->buflen, |
| 320 | format, args); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | va_end(args); |
| 322 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 323 | if (len >= (sizeof(env->buf) - env->buflen)) { |
Arjan van de Ven | 5cd2b45 | 2008-07-25 19:45:39 -0700 | [diff] [blame] | 324 | WARN(1, KERN_ERR "add_uevent_var: buffer size too small\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | return -ENOMEM; |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 326 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 328 | env->envp[env->envp_idx++] = &env->buf[env->buflen]; |
| 329 | env->buflen += len + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | return 0; |
| 331 | } |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 332 | EXPORT_SYMBOL_GPL(add_uevent_var); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | |
Kay Sievers | 4d17ffd | 2006-04-25 15:37:26 +0200 | [diff] [blame] | 334 | #if defined(CONFIG_NET) |
Eric W. Biederman | 07e9896 | 2010-05-04 17:36:44 -0700 | [diff] [blame] | 335 | static int uevent_net_init(struct net *net) |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 336 | { |
Eric W. Biederman | 07e9896 | 2010-05-04 17:36:44 -0700 | [diff] [blame] | 337 | struct uevent_sock *ue_sk; |
| 338 | |
| 339 | ue_sk = kzalloc(sizeof(*ue_sk), GFP_KERNEL); |
| 340 | if (!ue_sk) |
| 341 | return -ENOMEM; |
| 342 | |
| 343 | ue_sk->sk = netlink_kernel_create(net, NETLINK_KOBJECT_UEVENT, |
| 344 | 1, NULL, NULL, THIS_MODULE); |
| 345 | if (!ue_sk->sk) { |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 346 | printk(KERN_ERR |
| 347 | "kobject_uevent: unable to create netlink socket!\n"); |
| 348 | return -ENODEV; |
| 349 | } |
Eric W. Biederman | 07e9896 | 2010-05-04 17:36:44 -0700 | [diff] [blame] | 350 | mutex_lock(&uevent_sock_mutex); |
| 351 | list_add_tail(&ue_sk->list, &uevent_sock_list); |
| 352 | mutex_unlock(&uevent_sock_mutex); |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 353 | return 0; |
| 354 | } |
| 355 | |
Eric W. Biederman | 07e9896 | 2010-05-04 17:36:44 -0700 | [diff] [blame] | 356 | static void uevent_net_exit(struct net *net) |
| 357 | { |
| 358 | struct uevent_sock *ue_sk; |
| 359 | |
| 360 | mutex_lock(&uevent_sock_mutex); |
| 361 | list_for_each_entry(ue_sk, &uevent_sock_list, list) { |
| 362 | if (sock_net(ue_sk->sk) == net) |
| 363 | goto found; |
| 364 | } |
| 365 | mutex_unlock(&uevent_sock_mutex); |
| 366 | return; |
| 367 | |
| 368 | found: |
| 369 | list_del(&ue_sk->list); |
| 370 | mutex_unlock(&uevent_sock_mutex); |
| 371 | |
| 372 | netlink_kernel_release(ue_sk->sk); |
| 373 | kfree(ue_sk); |
| 374 | } |
| 375 | |
| 376 | static struct pernet_operations uevent_net_ops = { |
| 377 | .init = uevent_net_init, |
| 378 | .exit = uevent_net_exit, |
| 379 | }; |
| 380 | |
| 381 | static int __init kobject_uevent_init(void) |
| 382 | { |
| 383 | netlink_set_nonroot(NETLINK_KOBJECT_UEVENT, NL_NONROOT_RECV); |
| 384 | return register_pernet_subsys(&uevent_net_ops); |
| 385 | } |
| 386 | |
| 387 | |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 388 | postcore_initcall(kobject_uevent_init); |
Kay Sievers | 4d17ffd | 2006-04-25 15:37:26 +0200 | [diff] [blame] | 389 | #endif |