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[NET]: Make the loopback device per network namespace.

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This patch makes loopback_dev per network namespace.  Adding
code to create a different loopback device for each network
namespace and adding the code to free a loopback device
when a network namespace exits.

This patch modifies all users the loopback_dev so they
access it as init_net.loopback_dev, keeping all of the
code compiling and working.  A later pass will be needed to
update the users to use something other than the initial network
namespace.

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 22:10:56 -07:00
committed by David S. Miller
parent 0cc217e16c
commit 2774c7aba6
13 changed files with 64 additions and 45 deletions
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26
drivers/net/loopback.c
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@@ -57,6 +57,7 @@
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/percpu.h>
#include <net/net_namespace.h>
struct pcpu_lstats {
unsigned long packets;
@@ -252,7 +253,7 @@ static void loopback_setup(struct net_device *dev)
}
/* Setup and register the loopback device. */
static int __init loopback_init(void)
static int loopback_net_init(struct net *net)
{
struct net_device *dev;
int err;
@@ -262,12 +263,13 @@ static int __init loopback_init(void)
if (!dev)
goto out;
dev->nd_net = net;
err = register_netdev(dev);
if (err)
goto out_free_netdev;
err = 0;
loopback_dev = dev;
net->loopback_dev = dev;
out:
if (err)
@@ -279,7 +281,21 @@ out_free_netdev:
goto out;
}
fs_initcall(loopback_init);
static void loopback_net_exit(struct net *net)
{
struct net_device *dev = net->loopback_dev;
struct net_device *loopback_dev;
EXPORT_SYMBOL(loopback_dev);
unregister_netdev(dev);
}
static struct pernet_operations loopback_net_ops = {
.init = loopback_net_init,
.exit = loopback_net_exit,
};
static int __init loopback_init(void)
{
return register_pernet_device(&loopback_net_ops);
}
fs_initcall(loopback_init);