Linux Kernel  3.7.1
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tuntap_kern.c
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1 /*
2  * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3  * Licensed under the GPL
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 
50  .init = tuntap_init,
51  .protocol = eth_protocol,
52  .read = tuntap_read,
53  .write = tuntap_write,
54 };
55 
56 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);