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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: Eric W. Biederman <ebiederm@xmission.com>
Cc: Serge Hallyn <serue@us.ibm.com>
Cc: Daniel Lezcano <dlezcano@fr.ibm.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric W. Biederman 2007-11-30 23:55:42 +11:00 committed by David S. Miller
parent e51b6ba077
commit 95bdfccb2b
2 changed files with 66 additions and 0 deletions
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9
include/net/net_namespace.h
View File

@ -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 */

57
net/sysctl_net.c
View File

@ -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);