101 lines
2.3 KiB
C
101 lines
2.3 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/*
|
||
|
|
* Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
|
||
|
|
* James Leu (jleu@mindspring.net).
|
||
|
|
* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
|
||
|
|
* Copyright (C) 2001 by various other people who didn't put their name here.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/netdevice.h>
|
||
|
|
#include "etap.h"
|
||
|
|
#include <net_kern.h>
|
||
|
|
|
||
|
|
struct ethertap_init {
|
||
|
|
char *dev_name;
|
||
|
|
char *gate_addr;
|
||
|
|
};
|
||
|
|
|
||
|
|
static void etap_init(struct net_device *dev, void *data)
|
||
|
|
{
|
||
|
|
struct uml_net_private *pri;
|
||
|
|
struct ethertap_data *epri;
|
||
|
|
struct ethertap_init *init = data;
|
||
|
|
|
||
|
|
pri = netdev_priv(dev);
|
||
|
|
epri = (struct ethertap_data *) pri->user;
|
||
|
|
epri->dev_name = init->dev_name;
|
||
|
|
epri->gate_addr = init->gate_addr;
|
||
|
|
epri->data_fd = -1;
|
||
|
|
epri->control_fd = -1;
|
||
|
|
epri->dev = dev;
|
||
|
|
|
||
|
|
printk(KERN_INFO "ethertap backend - %s", epri->dev_name);
|
||
|
|
if (epri->gate_addr != NULL)
|
||
|
|
printk(KERN_CONT ", IP = %s", epri->gate_addr);
|
||
|
|
printk(KERN_CONT "\n");
|
||
|
|
}
|
||
|
|
|
||
|
|
static int etap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
|
||
|
|
{
|
||
|
|
int len;
|
||
|
|
|
||
|
|
len = net_recvfrom(fd, skb_mac_header(skb),
|
||
|
|
skb->dev->mtu + 2 + ETH_HEADER_ETHERTAP);
|
||
|
|
if (len <= 0)
|
||
|
|
return(len);
|
||
|
|
|
||
|
|
skb_pull(skb, 2);
|
||
|
|
len -= 2;
|
||
|
|
return len;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int etap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
|
||
|
|
{
|
||
|
|
skb_push(skb, 2);
|
||
|
|
return net_send(fd, skb->data, skb->len);
|
||
|
|
}
|
||
|
|
|
||
|
|
const struct net_kern_info ethertap_kern_info = {
|
||
|
|
.init = etap_init,
|
||
|
|
.protocol = eth_protocol,
|
||
|
|
.read = etap_read,
|
||
|
|
.write = etap_write,
|
||
|
|
};
|
||
|
|
|
||
|
|
int ethertap_setup(char *str, char **mac_out, void *data)
|
||
|
|
{
|
||
|
|
struct ethertap_init *init = data;
|
||
|
|
|
||
|
|
*init = ((struct ethertap_init)
|
||
|
|
{ .dev_name = NULL,
|
||
|
|
.gate_addr = NULL });
|
||
|
|
if (tap_setup_common(str, "ethertap", &init->dev_name, mac_out,
|
||
|
|
&init->gate_addr))
|
||
|
|
return 0;
|
||
|
|
if (init->dev_name == NULL) {
|
||
|
|
printk(KERN_ERR "ethertap_setup : Missing tap device name\n");
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct transport ethertap_transport = {
|
||
|
|
.list = LIST_HEAD_INIT(ethertap_transport.list),
|
||
|
|
.name = "ethertap",
|
||
|
|
.setup = ethertap_setup,
|
||
|
|
.user = ðertap_user_info,
|
||
|
|
.kern = ðertap_kern_info,
|
||
|
|
.private_size = sizeof(struct ethertap_data),
|
||
|
|
.setup_size = sizeof(struct ethertap_init),
|
||
|
|
};
|
||
|
|
|
||
|
|
static int register_ethertap(void)
|
||
|
|
{
|
||
|
|
register_transport(ðertap_transport);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
late_initcall(register_ethertap);
|