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>

1 files changed, 60 insertions, 8 deletions

diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index 7b48d44ced6e..9084f2550c2a 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