Merge tag 'for-v3.9' of git://git.infradead.org/battery-2.6

[linux-2.6-block.git] / net / core / net_namespace.c

diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 6456439cbbd9e4160c05105554db665226892620..8acce01b6dab90dede80bfb4bed6b4ce4a965108 100644 (file)
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -381,6 +381,21 @@ struct net *get_net_ns_by_pid(pid_t pid)
 }
 EXPORT_SYMBOL_GPL(get_net_ns_by_pid);
 
+static __net_init int net_ns_net_init(struct net *net)
+{
+       return proc_alloc_inum(&net->proc_inum);
+}
+
+static __net_exit void net_ns_net_exit(struct net *net)
+{
+       proc_free_inum(net->proc_inum);
+}
+
+static struct pernet_operations __net_initdata net_ns_ops = {
+       .init = net_ns_net_init,
+       .exit = net_ns_net_exit,
+};
+
 static int __init net_ns_init(void)
 {
        struct net_generic *ng;
@@ -412,6 +427,8 @@ static int __init net_ns_init(void)
 
        mutex_unlock(&net_mutex);
 
+       register_pernet_subsys(&net_ns_ops);
+
        return 0;
 }
 
@@ -630,16 +647,29 @@ static void netns_put(void *ns)
 
 static int netns_install(struct nsproxy *nsproxy, void *ns)
 {
+       struct net *net = ns;
+
+       if (!ns_capable(net->user_ns, CAP_SYS_ADMIN) ||
+           !nsown_capable(CAP_SYS_ADMIN))
+               return -EPERM;
+
        put_net(nsproxy->net_ns);
-       nsproxy->net_ns = get_net(ns);
+       nsproxy->net_ns = get_net(net);
        return 0;
 }
 
+static unsigned int netns_inum(void *ns)
+{
+       struct net *net = ns;
+       return net->proc_inum;
+}
+
 const struct proc_ns_operations netns_operations = {
        .name           = "net",
        .type           = CLONE_NEWNET,
        .get            = netns_get,
        .put            = netns_put,
        .install        = netns_install,
+       .inum           = netns_inum,
 };
 #endif