1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
  4 * James Leu (jleu@mindspring.net).
  5 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  6 * Copyright (C) 2001 by various other people who didn't put their name here.
 
  7 */
  8
  9#include <linux/init.h>
 10#include <linux/netdevice.h>
 11#include "etap.h"
 12#include <net_kern.h>
 13
 14struct ethertap_init {
 15	char *dev_name;
 16	char *gate_addr;
 17};
 18
 19static void etap_init(struct net_device *dev, void *data)
 20{
 21	struct uml_net_private *pri;
 22	struct ethertap_data *epri;
 23	struct ethertap_init *init = data;
 24
 25	pri = netdev_priv(dev);
 26	epri = (struct ethertap_data *) pri->user;
 27	epri->dev_name = init->dev_name;
 28	epri->gate_addr = init->gate_addr;
 29	epri->data_fd = -1;
 30	epri->control_fd = -1;
 31	epri->dev = dev;
 32
 33	printk(KERN_INFO "ethertap backend - %s", epri->dev_name);
 34	if (epri->gate_addr != NULL)
 35		printk(KERN_CONT ", IP = %s", epri->gate_addr);
 36	printk(KERN_CONT "\n");
 37}
 38
 39static int etap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
 40{
 41	int len;
 42
 43	len = net_recvfrom(fd, skb_mac_header(skb),
 44			   skb->dev->mtu + 2 + ETH_HEADER_ETHERTAP);
 45	if (len <= 0)
 46		return(len);
 47
 48	skb_pull(skb, 2);
 49	len -= 2;
 50	return len;
 51}
 52
 53static int etap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
 54{
 55	skb_push(skb, 2);
 56	return net_send(fd, skb->data, skb->len);
 57}
 58
 59const struct net_kern_info ethertap_kern_info = {
 60	.init			= etap_init,
 61	.protocol		= eth_protocol,
 62	.read			= etap_read,
 63	.write 			= etap_write,
 64};
 65
 66static int ethertap_setup(char *str, char **mac_out, void *data)
 67{
 68	struct ethertap_init *init = data;
 69
 70	*init = ((struct ethertap_init)
 71		{ .dev_name 	= NULL,
 72		  .gate_addr 	= NULL });
 73	if (tap_setup_common(str, "ethertap", &init->dev_name, mac_out,
 74			    &init->gate_addr))
 75		return 0;
 76	if (init->dev_name == NULL) {
 77		printk(KERN_ERR "ethertap_setup : Missing tap device name\n");
 78		return 0;
 79	}
 80
 81	return 1;
 82}
 83
 84static struct transport ethertap_transport = {
 85	.list 		= LIST_HEAD_INIT(ethertap_transport.list),
 86	.name 		= "ethertap",
 87	.setup  	= ethertap_setup,
 88	.user 		= &ethertap_user_info,
 89	.kern 		= &ethertap_kern_info,
 90	.private_size 	= sizeof(struct ethertap_data),
 91	.setup_size 	= sizeof(struct ethertap_init),
 92};
 93
 94static int register_ethertap(void)
 95{
 96	register_transport(&ethertap_transport);
 97	return 0;
 98}
 99
100late_initcall(register_ethertap);

 
  1/*
  2 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
  3 * James Leu (jleu@mindspring.net).
  4 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  5 * Copyright (C) 2001 by various other people who didn't put their name here.
  6 * Licensed under the GPL.
  7 */
  8
  9#include <linux/init.h>
 10#include <linux/netdevice.h>
 11#include "etap.h"
 12#include "net_kern.h"
 13
 14struct ethertap_init {
 15	char *dev_name;
 16	char *gate_addr;
 17};
 18
 19static void etap_init(struct net_device *dev, void *data)
 20{
 21	struct uml_net_private *pri;
 22	struct ethertap_data *epri;
 23	struct ethertap_init *init = data;
 24
 25	pri = netdev_priv(dev);
 26	epri = (struct ethertap_data *) pri->user;
 27	epri->dev_name = init->dev_name;
 28	epri->gate_addr = init->gate_addr;
 29	epri->data_fd = -1;
 30	epri->control_fd = -1;
 31	epri->dev = dev;
 32
 33	printk(KERN_INFO "ethertap backend - %s", epri->dev_name);
 34	if (epri->gate_addr != NULL)
 35		printk(KERN_CONT ", IP = %s", epri->gate_addr);
 36	printk(KERN_CONT "\n");
 37}
 38
 39static int etap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
 40{
 41	int len;
 42
 43	len = net_recvfrom(fd, skb_mac_header(skb),
 44			   skb->dev->mtu + 2 + ETH_HEADER_ETHERTAP);
 45	if (len <= 0)
 46		return(len);
 47
 48	skb_pull(skb, 2);
 49	len -= 2;
 50	return len;
 51}
 52
 53static int etap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
 54{
 55	skb_push(skb, 2);
 56	return net_send(fd, skb->data, skb->len);
 57}
 58
 59const struct net_kern_info ethertap_kern_info = {
 60	.init			= etap_init,
 61	.protocol		= eth_protocol,
 62	.read			= etap_read,
 63	.write 			= etap_write,
 64};
 65
 66int ethertap_setup(char *str, char **mac_out, void *data)
 67{
 68	struct ethertap_init *init = data;
 69
 70	*init = ((struct ethertap_init)
 71		{ .dev_name 	= NULL,
 72		  .gate_addr 	= NULL });
 73	if (tap_setup_common(str, "ethertap", &init->dev_name, mac_out,
 74			    &init->gate_addr))
 75		return 0;
 76	if (init->dev_name == NULL) {
 77		printk(KERN_ERR "ethertap_setup : Missing tap device name\n");
 78		return 0;
 79	}
 80
 81	return 1;
 82}
 83
 84static struct transport ethertap_transport = {
 85	.list 		= LIST_HEAD_INIT(ethertap_transport.list),
 86	.name 		= "ethertap",
 87	.setup  	= ethertap_setup,
 88	.user 		= &ethertap_user_info,
 89	.kern 		= &ethertap_kern_info,
 90	.private_size 	= sizeof(struct ethertap_data),
 91	.setup_size 	= sizeof(struct ethertap_init),
 92};
 93
 94static int register_ethertap(void)
 95{
 96	register_transport(&ethertap_transport);
 97	return 0;
 98}
 99
100late_initcall(register_ethertap);