[NET]: Implement the per network namespace sysctl infrastructure

[linux-2.6] / net / sysctl_net.c

diff --git a/net/sysctl_net.c b/net/sysctl_net.c
index 58a1b6b42dddba6c85c10330bacdb48f7438e4f4..c50c793aa7f00fa4eeb7184de2b75de323331b84 100644 (file)
--- a/net/sysctl_net.c
+++ b/net/sysctl_net.c
@@ -12,9 +12,9 @@
  *
  */
 
-#include <linux/config.h>
 #include <linux/mm.h>
 #include <linux/sysctl.h>
+#include <linux/nsproxy.h>
 
 #include <net/sock.h>
 
@@ -55,3 +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);