*/
#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/kobject.h>
+#include <linux/module.h>
+
#include <linux/socket.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
-#include <linux/string.h>
-#include <linux/kobject.h>
#include <net/sock.h>
-#define BUFFER_SIZE 2048 /* buffer for the variables */
-#define NUM_ENVP 32 /* number of env pointers */
-/* the strings here must match the enum in include/linux/kobject.h */
-const char *kobject_actions[] = {
- "add",
- "remove",
- "change",
- "move",
- "online",
- "offline",
-};
-
-#if defined(CONFIG_HOTPLUG)
u64 uevent_seqnum;
-char uevent_helper[UEVENT_HELPER_PATH_LEN] = "/sbin/hotplug";
+char uevent_helper[UEVENT_HELPER_PATH_LEN] = CONFIG_UEVENT_HELPER_PATH;
static DEFINE_SPINLOCK(sequence_lock);
#if defined(CONFIG_NET)
static struct sock *uevent_sock;
#endif
+/* the strings here must match the enum in include/linux/kobject.h */
+static const char *kobject_actions[] = {
+ [KOBJ_ADD] = "add",
+ [KOBJ_REMOVE] = "remove",
+ [KOBJ_CHANGE] = "change",
+ [KOBJ_MOVE] = "move",
+ [KOBJ_ONLINE] = "online",
+ [KOBJ_OFFLINE] = "offline",
+};
+
+/**
+ * kobject_action_type - translate action string to numeric type
+ *
+ * @buf: buffer containing the action string, newline is ignored
+ * @len: length of buffer
+ * @type: pointer to the location to store the action type
+ *
+ * Returns 0 if the action string was recognized.
+ */
+int kobject_action_type(const char *buf, size_t count,
+ enum kobject_action *type)
+{
+ enum kobject_action action;
+ int ret = -EINVAL;
+
+ if (count && (buf[count-1] == '\n' || buf[count-1] == '\0'))
+ count--;
+
+ if (!count)
+ goto out;
+
+ for (action = 0; action < ARRAY_SIZE(kobject_actions); action++) {
+ if (strncmp(kobject_actions[action], buf, count) != 0)
+ continue;
+ if (kobject_actions[action][count] != '\0')
+ continue;
+ *type = action;
+ ret = 0;
+ break;
+ }
+out:
+ return ret;
+}
+
/**
* kobject_uevent_env - send an uevent with environmental data
*
- * @action: action that is happening (usually KOBJ_MOVE)
+ * @action: action that is happening
* @kobj: struct kobject that the action is happening to
* @envp_ext: pointer to environmental data
*
* corresponding error when it fails.
*/
int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
- char *envp_ext[])
+ char *envp_ext[])
{
- char **envp;
- char *buffer;
- char *scratch;
- const char *action_string;
+ struct kobj_uevent_env *env;
+ const char *action_string = kobject_actions[action];
const char *devpath = NULL;
const char *subsystem;
struct kobject *top_kobj;
struct kset *kset;
struct kset_uevent_ops *uevent_ops;
u64 seq;
- char *seq_buff;
int i = 0;
int retval = 0;
- int j;
- pr_debug("%s\n", __FUNCTION__);
-
- action_string = kobject_actions[action];
- if (!action_string) {
- pr_debug("kobject attempted to send uevent without action_string!\n");
- return -EINVAL;
- }
+ pr_debug("kobject: '%s' (%p): %s\n",
+ kobject_name(kobj), kobj, __func__);
/* search the kset we belong to */
top_kobj = kobj;
- while (!top_kobj->kset && top_kobj->parent) {
+ while (!top_kobj->kset && top_kobj->parent)
top_kobj = top_kobj->parent;
- }
+
if (!top_kobj->kset) {
- pr_debug("kobject attempted to send uevent without kset!\n");
+ pr_debug("kobject: '%s' (%p): %s: attempted to send uevent "
+ "without kset!\n", kobject_name(kobj), kobj,
+ __func__);
return -EINVAL;
}
kset = top_kobj->kset;
uevent_ops = kset->uevent_ops;
- /* skip the event, if the filter returns zero. */
+ /* skip the event, if the filter returns zero. */
if (uevent_ops && uevent_ops->filter)
if (!uevent_ops->filter(kset, kobj)) {
- pr_debug("kobject filter function caused the event to drop!\n");
+ pr_debug("kobject: '%s' (%p): %s: filter function "
+ "caused the event to drop!\n",
+ kobject_name(kobj), kobj, __func__);
return 0;
}
else
subsystem = kobject_name(&kset->kobj);
if (!subsystem) {
- pr_debug("unset subsytem caused the event to drop!\n");
+ pr_debug("kobject: '%s' (%p): %s: unset subsystem caused the "
+ "event to drop!\n", kobject_name(kobj), kobj,
+ __func__);
return 0;
}
- /* environment index */
- envp = kzalloc(NUM_ENVP * sizeof (char *), GFP_KERNEL);
- if (!envp)
+ /* environment buffer */
+ env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
+ if (!env)
return -ENOMEM;
- /* environment values */
- buffer = kmalloc(BUFFER_SIZE, GFP_KERNEL);
- if (!buffer) {
- retval = -ENOMEM;
- goto exit;
- }
-
/* complete object path */
devpath = kobject_get_path(kobj, GFP_KERNEL);
if (!devpath) {
goto exit;
}
- /* event environemnt for helper process only */
- envp[i++] = "HOME=/";
- envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
-
/* default keys */
- scratch = buffer;
- envp [i++] = scratch;
- scratch += sprintf(scratch, "ACTION=%s", action_string) + 1;
- envp [i++] = scratch;
- scratch += sprintf (scratch, "DEVPATH=%s", devpath) + 1;
- envp [i++] = scratch;
- scratch += sprintf(scratch, "SUBSYSTEM=%s", subsystem) + 1;
- for (j = 0; envp_ext && envp_ext[j]; j++)
- envp[i++] = envp_ext[j];
- /* just reserve the space, overwrite it after kset call has returned */
- envp[i++] = seq_buff = scratch;
- scratch += strlen("SEQNUM=18446744073709551616") + 1;
+ retval = add_uevent_var(env, "ACTION=%s", action_string);
+ if (retval)
+ goto exit;
+ retval = add_uevent_var(env, "DEVPATH=%s", devpath);
+ if (retval)
+ goto exit;
+ retval = add_uevent_var(env, "SUBSYSTEM=%s", subsystem);
+ if (retval)
+ goto exit;
+
+ /* keys passed in from the caller */
+ if (envp_ext) {
+ for (i = 0; envp_ext[i]; i++) {
+ retval = add_uevent_var(env, "%s", envp_ext[i]);
+ if (retval)
+ goto exit;
+ }
+ }
/* let the kset specific function add its stuff */
if (uevent_ops && uevent_ops->uevent) {
- retval = uevent_ops->uevent(kset, kobj,
- &envp[i], NUM_ENVP - i, scratch,
- BUFFER_SIZE - (scratch - buffer));
+ retval = uevent_ops->uevent(kset, kobj, env);
if (retval) {
- pr_debug ("%s - uevent() returned %d\n",
- __FUNCTION__, retval);
+ pr_debug("kobject: '%s' (%p): %s: uevent() returned "
+ "%d\n", kobject_name(kobj), kobj,
+ __func__, retval);
goto exit;
}
}
- /* we will send an event, request a new sequence number */
+ /*
+ * Mark "add" and "remove" events in the object to ensure proper
+ * events to userspace during automatic cleanup. If the object did
+ * send an "add" event, "remove" will automatically generated by
+ * the core, if not already done by the caller.
+ */
+ if (action == KOBJ_ADD)
+ kobj->state_add_uevent_sent = 1;
+ else if (action == KOBJ_REMOVE)
+ kobj->state_remove_uevent_sent = 1;
+
+ /* we will send an event, so request a new sequence number */
spin_lock(&sequence_lock);
seq = ++uevent_seqnum;
spin_unlock(&sequence_lock);
- sprintf(seq_buff, "SEQNUM=%llu", (unsigned long long)seq);
+ retval = add_uevent_var(env, "SEQNUM=%llu", (unsigned long long)seq);
+ if (retval)
+ goto exit;
#if defined(CONFIG_NET)
/* send netlink message */
/* allocate message with the maximum possible size */
len = strlen(action_string) + strlen(devpath) + 2;
- skb = alloc_skb(len + BUFFER_SIZE, GFP_KERNEL);
+ skb = alloc_skb(len + env->buflen, GFP_KERNEL);
if (skb) {
+ char *scratch;
+
/* add header */
scratch = skb_put(skb, len);
sprintf(scratch, "%s@%s", action_string, devpath);
/* copy keys to our continuous event payload buffer */
- for (i = 2; envp[i]; i++) {
- len = strlen(envp[i]) + 1;
+ for (i = 0; i < env->envp_idx; i++) {
+ len = strlen(env->envp[i]) + 1;
scratch = skb_put(skb, len);
- strcpy(scratch, envp[i]);
+ strcpy(scratch, env->envp[i]);
}
NETLINK_CB(skb).dst_group = 1;
- netlink_broadcast(uevent_sock, skb, 0, 1, GFP_KERNEL);
- }
+ retval = netlink_broadcast(uevent_sock, skb, 0, 1,
+ GFP_KERNEL);
+ } else
+ retval = -ENOMEM;
}
#endif
argv [0] = uevent_helper;
argv [1] = (char *)subsystem;
argv [2] = NULL;
- call_usermodehelper (argv[0], argv, envp, UMH_WAIT_EXEC);
+ retval = add_uevent_var(env, "HOME=/");
+ if (retval)
+ goto exit;
+ retval = add_uevent_var(env,
+ "PATH=/sbin:/bin:/usr/sbin:/usr/bin");
+ if (retval)
+ goto exit;
+
+ retval = call_usermodehelper(argv[0], argv,
+ env->envp, UMH_WAIT_EXEC);
}
exit:
kfree(devpath);
- kfree(buffer);
- kfree(envp);
+ kfree(env);
return retval;
}
-
EXPORT_SYMBOL_GPL(kobject_uevent_env);
/**
* kobject_uevent - notify userspace by ending an uevent
*
- * @action: action that is happening (usually KOBJ_ADD and KOBJ_REMOVE)
+ * @action: action that is happening
* @kobj: struct kobject that the action is happening to
*
* Returns 0 if kobject_uevent() is completed with success or the
{
return kobject_uevent_env(kobj, action, NULL);
}
-
EXPORT_SYMBOL_GPL(kobject_uevent);
/**
- * add_uevent_var - helper for creating event variables
- * @envp: Pointer to table of environment variables, as passed into
- * uevent() method.
- * @num_envp: Number of environment variable slots available, as
- * passed into uevent() method.
- * @cur_index: Pointer to current index into @envp. It should be
- * initialized to 0 before the first call to add_uevent_var(),
- * and will be incremented on success.
- * @buffer: Pointer to buffer for environment variables, as passed
- * into uevent() method.
- * @buffer_size: Length of @buffer, as passed into uevent() method.
- * @cur_len: Pointer to current length of space used in @buffer.
- * Should be initialized to 0 before the first call to
- * add_uevent_var(), and will be incremented on success.
- * @format: Format for creating environment variable (of the form
- * "XXX=%x") for snprintf().
+ * add_uevent_var - add key value string to the environment buffer
+ * @env: environment buffer structure
+ * @format: printf format for the key=value pair
*
* Returns 0 if environment variable was added successfully or -ENOMEM
* if no space was available.
*/
-int add_uevent_var(char **envp, int num_envp, int *cur_index,
- char *buffer, int buffer_size, int *cur_len,
- const char *format, ...)
+int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...)
{
va_list args;
+ int len;
- /*
- * We check against num_envp - 1 to make sure there is at
- * least one slot left after we return, since kobject_uevent()
- * needs to set the last slot to NULL.
- */
- if (*cur_index >= num_envp - 1)
+ if (env->envp_idx >= ARRAY_SIZE(env->envp)) {
+ WARN(1, KERN_ERR "add_uevent_var: too many keys\n");
return -ENOMEM;
-
- envp[*cur_index] = buffer + *cur_len;
+ }
va_start(args, format);
- *cur_len += vsnprintf(envp[*cur_index],
- max(buffer_size - *cur_len, 0),
- format, args) + 1;
+ len = vsnprintf(&env->buf[env->buflen],
+ sizeof(env->buf) - env->buflen,
+ format, args);
va_end(args);
- if (*cur_len > buffer_size)
+ if (len >= (sizeof(env->buf) - env->buflen)) {
+ WARN(1, KERN_ERR "add_uevent_var: buffer size too small\n");
return -ENOMEM;
+ }
- (*cur_index)++;
+ env->envp[env->envp_idx++] = &env->buf[env->buflen];
+ env->buflen += len + 1;
return 0;
}
EXPORT_SYMBOL_GPL(add_uevent_var);
#if defined(CONFIG_NET)
static int __init kobject_uevent_init(void)
{
- uevent_sock = netlink_kernel_create(NETLINK_KOBJECT_UEVENT, 1, NULL,
- NULL, THIS_MODULE);
-
+ uevent_sock = netlink_kernel_create(&init_net, NETLINK_KOBJECT_UEVENT,
+ 1, NULL, NULL, THIS_MODULE);
if (!uevent_sock) {
printk(KERN_ERR
"kobject_uevent: unable to create netlink socket!\n");
postcore_initcall(kobject_uevent_init);
#endif
-
-#endif /* CONFIG_HOTPLUG */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff