Commit 95bdfccb authored by Eric W. Biederman's avatar Eric W. Biederman Committed by David S. Miller
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[NET]: Implement the per network namespace sysctl infrastructure

The user interface is: register_net_sysctl_table and
unregister_net_sysctl_table.  Very much like the current
interface except there is a network namespace parameter.

With this any sysctl registered with register_net_sysctl_table
will only show up to tasks in the same network namespace.

All other sysctls continue to be globally visible.
Signed-off-by: default avatarEric W. Biederman <>
Cc: Serge Hallyn <>
Cc: Daniel Lezcano <>
Cc: Cedric Le Goater <>
Cc: Pavel Emelyanov <>
Signed-off-by: default avatarHerbert Xu <>
Signed-off-by: default avatarDavid S. Miller <>
parent e51b6ba0
......@@ -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 */
......@@ -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[] = {
{ 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)
return 0;
static void sysctl_net_exit(struct net *net)
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;
return ret;
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);
void unregister_net_sysctl_table(struct ctl_table_header *header)
return unregister_sysctl_table(header);
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