10d024c1b2
It's been a useless no-op for long enough in 2.6 so I figured it's time to remove it. The number of people that could object because they're maintaining unified 2.4 and 2.6 drivers is probably rather small. [ Handled drivers added by netdev tree and some missed IRDA cases... -DaveM ] Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Jeff Garzik <jeff@garzik.org> Signed-off-by: David S. Miller <davem@davemloft.net>
155 lines
3.7 KiB
C
155 lines
3.7 KiB
C
/* dummy.c: a dummy net driver
|
|
|
|
The purpose of this driver is to provide a device to point a
|
|
route through, but not to actually transmit packets.
|
|
|
|
Why? If you have a machine whose only connection is an occasional
|
|
PPP/SLIP/PLIP link, you can only connect to your own hostname
|
|
when the link is up. Otherwise you have to use localhost.
|
|
This isn't very consistent.
|
|
|
|
One solution is to set up a dummy link using PPP/SLIP/PLIP,
|
|
but this seems (to me) too much overhead for too little gain.
|
|
This driver provides a small alternative. Thus you can do
|
|
|
|
[when not running slip]
|
|
ifconfig dummy slip.addr.ess.here up
|
|
[to go to slip]
|
|
ifconfig dummy down
|
|
dip whatever
|
|
|
|
This was written by looking at Donald Becker's skeleton driver
|
|
and the loopback driver. I then threw away anything that didn't
|
|
apply! Thanks to Alan Cox for the key clue on what to do with
|
|
misguided packets.
|
|
|
|
Nick Holloway, 27th May 1994
|
|
[I tweaked this explanation a little but that's all]
|
|
Alan Cox, 30th May 1994
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/etherdevice.h>
|
|
#include <linux/init.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <net/rtnetlink.h>
|
|
|
|
static int numdummies = 1;
|
|
|
|
static int dummy_xmit(struct sk_buff *skb, struct net_device *dev);
|
|
|
|
static int dummy_set_address(struct net_device *dev, void *p)
|
|
{
|
|
struct sockaddr *sa = p;
|
|
|
|
if (!is_valid_ether_addr(sa->sa_data))
|
|
return -EADDRNOTAVAIL;
|
|
|
|
memcpy(dev->dev_addr, sa->sa_data, ETH_ALEN);
|
|
return 0;
|
|
}
|
|
|
|
/* fake multicast ability */
|
|
static void set_multicast_list(struct net_device *dev)
|
|
{
|
|
}
|
|
|
|
static void dummy_setup(struct net_device *dev)
|
|
{
|
|
/* Initialize the device structure. */
|
|
dev->hard_start_xmit = dummy_xmit;
|
|
dev->set_multicast_list = set_multicast_list;
|
|
dev->set_mac_address = dummy_set_address;
|
|
dev->destructor = free_netdev;
|
|
|
|
/* Fill in device structure with ethernet-generic values. */
|
|
ether_setup(dev);
|
|
dev->tx_queue_len = 0;
|
|
dev->change_mtu = NULL;
|
|
dev->flags |= IFF_NOARP;
|
|
dev->flags &= ~IFF_MULTICAST;
|
|
random_ether_addr(dev->dev_addr);
|
|
}
|
|
|
|
static int dummy_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
dev->stats.tx_packets++;
|
|
dev->stats.tx_bytes += skb->len;
|
|
|
|
dev_kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static int dummy_validate(struct nlattr *tb[], struct nlattr *data[])
|
|
{
|
|
if (tb[IFLA_ADDRESS]) {
|
|
if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
|
|
return -EINVAL;
|
|
if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
|
|
return -EADDRNOTAVAIL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct rtnl_link_ops dummy_link_ops __read_mostly = {
|
|
.kind = "dummy",
|
|
.setup = dummy_setup,
|
|
.validate = dummy_validate,
|
|
};
|
|
|
|
/* Number of dummy devices to be set up by this module. */
|
|
module_param(numdummies, int, 0);
|
|
MODULE_PARM_DESC(numdummies, "Number of dummy pseudo devices");
|
|
|
|
static int __init dummy_init_one(void)
|
|
{
|
|
struct net_device *dev_dummy;
|
|
int err;
|
|
|
|
dev_dummy = alloc_netdev(0, "dummy%d", dummy_setup);
|
|
if (!dev_dummy)
|
|
return -ENOMEM;
|
|
|
|
err = dev_alloc_name(dev_dummy, dev_dummy->name);
|
|
if (err < 0)
|
|
goto err;
|
|
|
|
dev_dummy->rtnl_link_ops = &dummy_link_ops;
|
|
err = register_netdevice(dev_dummy);
|
|
if (err < 0)
|
|
goto err;
|
|
return 0;
|
|
|
|
err:
|
|
free_netdev(dev_dummy);
|
|
return err;
|
|
}
|
|
|
|
static int __init dummy_init_module(void)
|
|
{
|
|
int i, err = 0;
|
|
|
|
rtnl_lock();
|
|
err = __rtnl_link_register(&dummy_link_ops);
|
|
|
|
for (i = 0; i < numdummies && !err; i++)
|
|
err = dummy_init_one();
|
|
if (err < 0)
|
|
__rtnl_link_unregister(&dummy_link_ops);
|
|
rtnl_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
static void __exit dummy_cleanup_module(void)
|
|
{
|
|
rtnl_link_unregister(&dummy_link_ops);
|
|
}
|
|
|
|
module_init(dummy_init_module);
|
|
module_exit(dummy_cleanup_module);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_RTNL_LINK("dummy");
|