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ns proc: Add support for the network namespace.

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Implementing file descriptors for the network namespace
is simple and straight forward.

Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Daniel Lezcano <daniel.lezcano@free.fr>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2010-03-07 18:14:23 -08:00
parent 0663c6f8fa
commit 13b6f57623
3 changed files with 35 additions and 0 deletions
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3
fs/proc/namespaces.c
View file

@ -16,6 +16,9 @@
static const struct proc_ns_operations *ns_entries[] = {
#ifdef CONFIG_NET_NS
&netns_operations,
#endif
};
static const struct file_operations ns_file_operations = {

1
include/linux/proc_fs.h
View file

@ -265,6 +265,7 @@ struct proc_ns_operations {
void (*put)(void *ns);
int (*install)(struct nsproxy *nsproxy, void *ns);
};
extern const struct proc_ns_operations netns_operations;
union proc_op {
int (*proc_get_link)(struct inode *, struct path *);

31
net/core/net_namespace.c
View file

@ -573,3 +573,34 @@ void unregister_pernet_device(struct pernet_operations *ops)
mutex_unlock(&net_mutex);
}
EXPORT_SYMBOL_GPL(unregister_pernet_device);
#ifdef CONFIG_NET_NS
static void *netns_get(struct task_struct *task)
{
struct net *net;
rcu_read_lock();
net = get_net(task->nsproxy->net_ns);
rcu_read_unlock();
return net;
}
static void netns_put(void *ns)
{
put_net(ns);
}
static int netns_install(struct nsproxy *nsproxy, void *ns)
{
put_net(nsproxy->net_ns);
nsproxy->net_ns = get_net(ns);
return 0;
}
const struct proc_ns_operations netns_operations = {
.name = "net",
.type = CLONE_NEWNET,
.get = netns_get,
.put = netns_put,
.install = netns_install,
};
#endif