From 194ee66693088d40aa7774f6d2cb1523908430ed Mon Sep 17 00:00:00 2001
From: "Eric W. Biederman" <ebiederm@xmission.com>
Date: Fri, 30 Nov 2007 23:55:42 +1100
Subject: [PATCH] --- yaml --- r: 78232 b: refs/heads/master c:
 95bdfccb2bf4ea21c0065772c6a2c75cbaf6ad0d h: refs/heads/master v: v3

---
 [refs]                            |  2 +-
 trunk/include/net/net_namespace.h |  9 +++++
 trunk/net/sysctl_net.c            | 57 +++++++++++++++++++++++++++++++
 3 files changed, 67 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 79859eab81d2..600827c72ffb 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: e51b6ba077791f2f8c876022b37419be7a2ceec3
+refs/heads/master: 95bdfccb2bf4ea21c0065772c6a2c75cbaf6ad0d
diff --git a/trunk/include/net/net_namespace.h b/trunk/include/net/net_namespace.h
index 4d0d6349aa7e..235214c4c231 100644
--- a/trunk/include/net/net_namespace.h
+++ b/trunk/include/net/net_namespace.h
@@ -25,6 +25,8 @@ struct net {
 	struct proc_dir_entry 	*proc_net_stat;
 	struct proc_dir_entry 	*proc_net_root;
 
+	struct list_head	sysctl_table_headers;
+
 	struct net_device       *loopback_dev;          /* The loopback */
 
 	struct list_head 	dev_base_head;
@@ -144,4 +146,11 @@ extern void unregister_pernet_subsys(struct pernet_operations *);
 extern int register_pernet_device(struct pernet_operations *);
 extern void unregister_pernet_device(struct pernet_operations *);
 
+struct ctl_path;
+struct ctl_table;
+struct ctl_table_header;
+extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
+	const struct ctl_path *path, struct ctl_table *table);
+extern void unregister_net_sysctl_table(struct ctl_table_header *header);
+
 #endif /* __NET_NET_NAMESPACE_H */
diff --git a/trunk/net/sysctl_net.c b/trunk/net/sysctl_net.c
index cd4eafbab1b8..c50c793aa7f0 100644
--- a/trunk/net/sysctl_net.c
+++ b/trunk/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);