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kobject: Send hotplug events in all network namespaces

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Open a copy of the uevent kernel socket in each network
namespace so we can send uevents in all network namespaces.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Eric W. Biederman 2010-05-04 17:36:44 -07:00 committed by Greg Kroah-Hartman
parent 1d9e882ba4
commit 07e98962fa
1 changed files with 60 additions and 8 deletions
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68
lib/kobject_uevent.c
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@ -24,13 +24,19 @@
#include <linux/skbuff.h>
#include <linux/netlink.h>
#include <net/sock.h>
#include <net/net_namespace.h>
u64 uevent_seqnum;
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;
#ifdef CONFIG_NET
struct uevent_sock {
struct list_head list;
struct sock *sk;
};
static LIST_HEAD(uevent_sock_list);
static DEFINE_MUTEX(uevent_sock_mutex);
#endif
/* the strings here must match the enum in include/linux/kobject.h */
@ -100,6 +106,9 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
u64 seq;
int i = 0;
int retval = 0;
#ifdef CONFIG_NET
struct uevent_sock *ue_sk;
#endif
pr_debug("kobject: '%s' (%p): %s\n",
kobject_name(kobj), kobj, __func__);
@ -211,7 +220,9 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
#if defined(CONFIG_NET)
/* send netlink message */
if (uevent_sock) {
mutex_lock(&uevent_sock_mutex);
list_for_each_entry(ue_sk, &uevent_sock_list, list) {
struct sock *uevent_sock = ue_sk->sk;
struct sk_buff *skb;
size_t len;
@ -241,6 +252,7 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
} else
retval = -ENOMEM;
}
mutex_unlock(&uevent_sock_mutex);
#endif
/* call uevent_helper, usually only enabled during early boot */
@ -320,18 +332,58 @@ int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...)
EXPORT_SYMBOL_GPL(add_uevent_var);
#if defined(CONFIG_NET)
static int __init kobject_uevent_init(void)
static int uevent_net_init(struct net *net)
{
uevent_sock = netlink_kernel_create(&init_net, NETLINK_KOBJECT_UEVENT,
1, NULL, NULL, THIS_MODULE);
if (!uevent_sock) {
struct uevent_sock *ue_sk;
ue_sk = kzalloc(sizeof(*ue_sk), GFP_KERNEL);
if (!ue_sk)
return -ENOMEM;
ue_sk->sk = netlink_kernel_create(net, NETLINK_KOBJECT_UEVENT,
1, NULL, NULL, THIS_MODULE);
if (!ue_sk->sk) {
printk(KERN_ERR
"kobject_uevent: unable to create netlink socket!\n");
return -ENODEV;
}
netlink_set_nonroot(NETLINK_KOBJECT_UEVENT, NL_NONROOT_RECV);
mutex_lock(&uevent_sock_mutex);
list_add_tail(&ue_sk->list, &uevent_sock_list);
mutex_unlock(&uevent_sock_mutex);
return 0;
}
static void uevent_net_exit(struct net *net)
{
struct uevent_sock *ue_sk;
mutex_lock(&uevent_sock_mutex);
list_for_each_entry(ue_sk, &uevent_sock_list, list) {
if (sock_net(ue_sk->sk) == net)
goto found;
}
mutex_unlock(&uevent_sock_mutex);
return;
found:
list_del(&ue_sk->list);
mutex_unlock(&uevent_sock_mutex);
netlink_kernel_release(ue_sk->sk);
kfree(ue_sk);
}
static struct pernet_operations uevent_net_ops = {
.init = uevent_net_init,
.exit = uevent_net_exit,
};
static int __init kobject_uevent_init(void)
{
netlink_set_nonroot(NETLINK_KOBJECT_UEVENT, NL_NONROOT_RECV);
return register_pernet_subsys(&uevent_net_ops);
}
postcore_initcall(kobject_uevent_init);
#endif