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