1/*
2 * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
4 */
5
6#include "linux/stddef.h"
7#include "linux/netdevice.h"
8#include "linux/etherdevice.h"
9#include "linux/skbuff.h"
10#include "linux/init.h"
11#include "asm/errno.h"
12#include "net_kern.h"
13#include "net_user.h"
14#include "tuntap.h"
15
16struct tuntap_init {
17	char *dev_name;
18	char *gate_addr;
19};
20
21static void tuntap_init(struct net_device *dev, void *data)
22{
23	struct uml_net_private *pri;
24	struct tuntap_data *tpri;
25	struct tuntap_init *init = data;
26
27	pri = dev->priv;
28	tpri = (struct tuntap_data *) pri->user;
29	tpri->dev_name = init->dev_name;
30	tpri->fixed_config = (init->dev_name != NULL);
31	tpri->gate_addr = init->gate_addr;
32	tpri->fd = -1;
33	tpri->dev = dev;
34
35	printk("TUN/TAP backend - ");
36	if (tpri->gate_addr != NULL)
37		printk("IP = %s", tpri->gate_addr);
38	printk("\n");
39}
40
41static int tuntap_read(int fd, struct sk_buff **skb,
42		       struct uml_net_private *lp)
43{
44	*skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
45	if(*skb == NULL) return(-ENOMEM);
46	return(net_read(fd, skb_mac_header(*skb),
47			(*skb)->dev->mtu + ETH_HEADER_OTHER));
48}
49
50static int tuntap_write(int fd, struct sk_buff **skb,
51			struct uml_net_private *lp)
52{
53	return(net_write(fd, (*skb)->data, (*skb)->len));
54}
55
56const struct net_kern_info tuntap_kern_info = {
57	.init			= tuntap_init,
58	.protocol		= eth_protocol,
59	.read			= tuntap_read,
60	.write 			= tuntap_write,
61};
62
63int tuntap_setup(char *str, char **mac_out, void *data)
64{
65	struct tuntap_init *init = data;
66
67	*init = ((struct tuntap_init)
68		{ .dev_name 	= NULL,
69		  .gate_addr 	= NULL });
70	if(tap_setup_common(str, "tuntap", &init->dev_name, mac_out,
71			    &init->gate_addr))
72		return(0);
73
74	return(1);
75}
76
77static struct transport tuntap_transport = {
78	.list 		= LIST_HEAD_INIT(tuntap_transport.list),
79	.name 		= "tuntap",
80	.setup  	= tuntap_setup,
81	.user 		= &tuntap_user_info,
82	.kern 		= &tuntap_kern_info,
83	.private_size 	= sizeof(struct tuntap_data),
84	.setup_size 	= sizeof(struct tuntap_init),
85};
86
87static int register_tuntap(void)
88{
89	register_transport(&tuntap_transport);
90	return 0;
91}
92
93late_initcall(register_tuntap);
94