1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #include <linux/netdevice.h>
7*4882a593Smuzhiyun #include <linux/init.h>
8*4882a593Smuzhiyun #include <linux/skbuff.h>
9*4882a593Smuzhiyun #include <asm/errno.h>
10*4882a593Smuzhiyun #include <net_kern.h>
11*4882a593Smuzhiyun #include "tuntap.h"
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun struct tuntap_init {
14*4882a593Smuzhiyun char *dev_name;
15*4882a593Smuzhiyun char *gate_addr;
16*4882a593Smuzhiyun };
17*4882a593Smuzhiyun
tuntap_init(struct net_device * dev,void * data)18*4882a593Smuzhiyun static void tuntap_init(struct net_device *dev, void *data)
19*4882a593Smuzhiyun {
20*4882a593Smuzhiyun struct uml_net_private *pri;
21*4882a593Smuzhiyun struct tuntap_data *tpri;
22*4882a593Smuzhiyun struct tuntap_init *init = data;
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun pri = netdev_priv(dev);
25*4882a593Smuzhiyun tpri = (struct tuntap_data *) pri->user;
26*4882a593Smuzhiyun tpri->dev_name = init->dev_name;
27*4882a593Smuzhiyun tpri->fixed_config = (init->dev_name != NULL);
28*4882a593Smuzhiyun tpri->gate_addr = init->gate_addr;
29*4882a593Smuzhiyun tpri->fd = -1;
30*4882a593Smuzhiyun tpri->dev = dev;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun printk(KERN_INFO "TUN/TAP backend - ");
33*4882a593Smuzhiyun if (tpri->gate_addr != NULL)
34*4882a593Smuzhiyun printk(KERN_CONT "IP = %s", tpri->gate_addr);
35*4882a593Smuzhiyun printk(KERN_CONT "\n");
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun
tuntap_read(int fd,struct sk_buff * skb,struct uml_net_private * lp)38*4882a593Smuzhiyun static int tuntap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
39*4882a593Smuzhiyun {
40*4882a593Smuzhiyun return net_read(fd, skb_mac_header(skb),
41*4882a593Smuzhiyun skb->dev->mtu + ETH_HEADER_OTHER);
42*4882a593Smuzhiyun }
43*4882a593Smuzhiyun
tuntap_write(int fd,struct sk_buff * skb,struct uml_net_private * lp)44*4882a593Smuzhiyun static int tuntap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
45*4882a593Smuzhiyun {
46*4882a593Smuzhiyun return net_write(fd, skb->data, skb->len);
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun const struct net_kern_info tuntap_kern_info = {
50*4882a593Smuzhiyun .init = tuntap_init,
51*4882a593Smuzhiyun .protocol = eth_protocol,
52*4882a593Smuzhiyun .read = tuntap_read,
53*4882a593Smuzhiyun .write = tuntap_write,
54*4882a593Smuzhiyun };
55*4882a593Smuzhiyun
tuntap_setup(char * str,char ** mac_out,void * data)56*4882a593Smuzhiyun int tuntap_setup(char *str, char **mac_out, void *data)
57*4882a593Smuzhiyun {
58*4882a593Smuzhiyun struct tuntap_init *init = data;
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun *init = ((struct tuntap_init)
61*4882a593Smuzhiyun { .dev_name = NULL,
62*4882a593Smuzhiyun .gate_addr = NULL });
63*4882a593Smuzhiyun if (tap_setup_common(str, "tuntap", &init->dev_name, mac_out,
64*4882a593Smuzhiyun &init->gate_addr))
65*4882a593Smuzhiyun return 0;
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun return 1;
68*4882a593Smuzhiyun }
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun static struct transport tuntap_transport = {
71*4882a593Smuzhiyun .list = LIST_HEAD_INIT(tuntap_transport.list),
72*4882a593Smuzhiyun .name = "tuntap",
73*4882a593Smuzhiyun .setup = tuntap_setup,
74*4882a593Smuzhiyun .user = &tuntap_user_info,
75*4882a593Smuzhiyun .kern = &tuntap_kern_info,
76*4882a593Smuzhiyun .private_size = sizeof(struct tuntap_data),
77*4882a593Smuzhiyun .setup_size = sizeof(struct tuntap_init),
78*4882a593Smuzhiyun };
79*4882a593Smuzhiyun
register_tuntap(void)80*4882a593Smuzhiyun static int register_tuntap(void)
81*4882a593Smuzhiyun {
82*4882a593Smuzhiyun register_transport(&tuntap_transport);
83*4882a593Smuzhiyun return 0;
84*4882a593Smuzhiyun }
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun late_initcall(register_tuntap);
87