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[NET]: Add network namespace clone & unshare support.

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This patch allows you to create a new network namespace
using sys_clone, or sys_unshare.

As the network namespace is still experimental and under development
clone and unshare support is only made available when CONFIG_NET_NS is
selected at compile time.

As this patch introduces network namespace support into code paths
that exist when the CONFIG_NET is not selected there are a few
additions made to net_namespace.h to allow a few more functions
to be used when the networking stack is not compiled in.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric W. Biederman
2007-09-26 22:04:26 -07:00
committed by David S. Miller
parent 8b41d1887d
commit 9dd776b6d7
6 changed files with 83 additions and 5 deletions
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43
net/core/net_namespace.c
View File

@@ -4,6 +4,7 @@
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <net/net_namespace.h>
/*
@@ -32,12 +33,10 @@ void net_unlock(void)
mutex_unlock(&net_list_mutex);
}
#if 0
static struct net *net_alloc(void)
{
return kmem_cache_alloc(net_cachep, GFP_KERNEL);
}
#endif
static void net_free(struct net *net)
{
@@ -128,6 +127,46 @@ out_undo:
goto out;
}
struct net *copy_net_ns(unsigned long flags, struct net *old_net)
{
struct net *new_net = NULL;
int err;
get_net(old_net);
if (!(flags & CLONE_NEWNET))
return old_net;
#ifndef CONFIG_NET_NS
return ERR_PTR(-EINVAL);
#endif
err = -ENOMEM;
new_net = net_alloc();
if (!new_net)
goto out;
mutex_lock(&net_mutex);
err = setup_net(new_net);
if (err)
goto out_unlock;
net_lock();
list_add_tail(&new_net->list, &net_namespace_list);
net_unlock();
out_unlock:
mutex_unlock(&net_mutex);
out:
put_net(old_net);
if (err) {
net_free(new_net);
new_net = ERR_PTR(err);
}
return new_net;
}
static int __init net_ns_init(void)
{
int err;