net: move and export get_net_ns_by_pid

[pandora-kernel.git] / net / core / net_namespace.c

diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 5cd0b22..ddd2cd2 100644 (file)
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -7,6 +7,7 @@
 #include <linux/sched.h>
 #include <linux/idr.h>
 #include <linux/rculist.h>
+#include <linux/nsproxy.h>
 #include <net/net_namespace.h>
 #include <net/netns/generic.h>
 
@@ -201,6 +202,26 @@ struct net *copy_net_ns(unsigned long flags, struct net *old_net)
 }
 #endif
 
+struct net *get_net_ns_by_pid(pid_t pid)
+{
+       struct task_struct *tsk;
+       struct net *net;
+
+       /* Lookup the network namespace */
+       net = ERR_PTR(-ESRCH);
+       rcu_read_lock();
+       tsk = find_task_by_vpid(pid);
+       if (tsk) {
+               struct nsproxy *nsproxy;
+               nsproxy = task_nsproxy(tsk);
+               if (nsproxy)
+                       net = get_net(nsproxy->net_ns);
+       }
+       rcu_read_unlock();
+       return net;
+}
+EXPORT_SYMBOL_GPL(get_net_ns_by_pid);
+
 static int __init net_ns_init(void)
 {
        struct net_generic *ng;