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-rw-r--r--net/core/net_namespace.c42
1 files changed, 38 insertions, 4 deletions
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index b36444e381..b1dc84c4fd 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -321,8 +321,9 @@ static __net_init int setup_net(struct net *net, struct user_namespace *user_ns)
{
/* Must be called with pernet_ops_rwsem held */
const struct pernet_operations *ops, *saved_ops;
- int error = 0;
LIST_HEAD(net_exit_list);
+ LIST_HEAD(dev_kill_list);
+ int error = 0;
refcount_set(&net->ns.count, 1);
ref_tracker_dir_init(&net->refcnt_tracker, 128, "net refcnt");
@@ -361,6 +362,15 @@ out_undo:
synchronize_rcu();
ops = saved_ops;
+ rtnl_lock();
+ list_for_each_entry_continue_reverse(ops, &pernet_list, list) {
+ if (ops->exit_batch_rtnl)
+ ops->exit_batch_rtnl(&net_exit_list, &dev_kill_list);
+ }
+ unregister_netdevice_many(&dev_kill_list);
+ rtnl_unlock();
+
+ ops = saved_ops;
list_for_each_entry_continue_reverse(ops, &pernet_list, list)
ops_exit_list(ops, &net_exit_list);
@@ -576,6 +586,7 @@ static void cleanup_net(struct work_struct *work)
struct net *net, *tmp, *last;
struct llist_node *net_kill_list;
LIST_HEAD(net_exit_list);
+ LIST_HEAD(dev_kill_list);
/* Atomically snapshot the list of namespaces to cleanup */
net_kill_list = llist_del_all(&cleanup_list);
@@ -614,7 +625,15 @@ static void cleanup_net(struct work_struct *work)
* the rcu_barrier() below isn't sufficient alone.
* Also the pre_exit() and exit() methods need this barrier.
*/
- synchronize_rcu();
+ synchronize_rcu_expedited();
+
+ rtnl_lock();
+ list_for_each_entry_reverse(ops, &pernet_list, list) {
+ if (ops->exit_batch_rtnl)
+ ops->exit_batch_rtnl(&net_exit_list, &dev_kill_list);
+ }
+ unregister_netdevice_many(&dev_kill_list);
+ rtnl_unlock();
/* Run all of the network namespace exit methods */
list_for_each_entry_reverse(ops, &pernet_list, list)
@@ -674,11 +693,16 @@ EXPORT_SYMBOL_GPL(__put_net);
* get_net_ns - increment the refcount of the network namespace
* @ns: common namespace (net)
*
- * Returns the net's common namespace.
+ * Returns the net's common namespace or ERR_PTR() if ref is zero.
*/
struct ns_common *get_net_ns(struct ns_common *ns)
{
- return &get_net(container_of(ns, struct net, ns))->ns;
+ struct net *net;
+
+ net = maybe_get_net(container_of(ns, struct net, ns));
+ if (net)
+ return &net->ns;
+ return ERR_PTR(-EINVAL);
}
EXPORT_SYMBOL_GPL(get_net_ns);
@@ -1196,7 +1220,17 @@ static void free_exit_list(struct pernet_operations *ops, struct list_head *net_
{
ops_pre_exit_list(ops, net_exit_list);
synchronize_rcu();
+
+ if (ops->exit_batch_rtnl) {
+ LIST_HEAD(dev_kill_list);
+
+ rtnl_lock();
+ ops->exit_batch_rtnl(net_exit_list, &dev_kill_list);
+ unregister_netdevice_many(&dev_kill_list);
+ rtnl_unlock();
+ }
ops_exit_list(ops, net_exit_list);
+
ops_free_list(ops, net_exit_list);
}