1 files changed, 57 insertions, 0 deletions

diff --git a/net/sysctl_net.c b/net/sysctl_net.c
index cd4eafbab1b8..c50c793aa7f0 100644
--- a/net/sysctl_net.c
+++ b/net/sysctl_net.c
@@ -14,6 +14,7 @@
 
 #include <linux/mm.h>
 #include <linux/sysctl.h>
+#include <linux/nsproxy.h>
 
 #include <net/sock.h>
 
@@ -54,3 +55,59 @@ struct ctl_table net_table[] = {
 #endif
         { 0 },
 };
+
+static struct list_head *
+net_ctl_header_lookup(struct ctl_table_root *root, struct nsproxy *namespaces)
+{
+        return &namespaces->net_ns->sysctl_table_headers;
+}
+
+static struct ctl_table_root net_sysctl_root = {
+        .lookup = net_ctl_header_lookup,
+};
+
+static int sysctl_net_init(struct net *net)
+{
+        INIT_LIST_HEAD(&net->sysctl_table_headers);
+        return 0;
+}
+
+static void sysctl_net_exit(struct net *net)
+{
+        WARN_ON(!list_empty(&net->sysctl_table_headers));
+        return;
+}
+
+static struct pernet_operations sysctl_pernet_ops = {
+        .init = sysctl_net_init,
+        .exit = sysctl_net_exit,
+};
+
+static __init int sysctl_init(void)
+{
+        int ret;
+        ret = register_pernet_subsys(&sysctl_pernet_ops);
+        if (ret)
+                goto out;
+        register_sysctl_root(&net_sysctl_root);
+out:
+        return ret;
+}
+subsys_initcall(sysctl_init);
+
+struct ctl_table_header *register_net_sysctl_table(struct net *net,
+        const struct ctl_path *path, struct ctl_table *table)
+{
+        struct nsproxy namespaces;
+        namespaces = *current->nsproxy;
+        namespaces.net_ns = net;
+        return __register_sysctl_paths(&net_sysctl_root,
+                                        &namespaces, path, table);
+}
+EXPORT_SYMBOL_GPL(register_net_sysctl_table);
+
+void unregister_net_sysctl_table(struct ctl_table_header *header)
+{
+        return unregister_sysctl_table(header);
+}
+EXPORT_SYMBOL_GPL(unregister_net_sysctl_table);