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authorEric W. Biederman <ebiederm@xmission.com>2010-05-04 17:36:44 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2010-05-21 09:37:32 -0700
commit07e98962fa778b9782c8845dfcb06a84cc050744 (patch)
tree04fe68b0cbc924b8b894c5dc3277b6151f6753a2 /lib
parent1d9e882ba4971f31473dd812da64909f30a6c242 (diff)
downloadlinux-2.6.34-ux500-07e98962fa778b9782c8845dfcb06a84cc050744.tar.gz
kobject: Send hotplug events in all network namespaces
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>
Diffstat (limited to 'lib')
-rw-r--r--lib/kobject_uevent.c68
1 files changed, 60 insertions, 8 deletions
diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index 7b48d44ced6..9084f2550c2 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -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