kernel/arch/um/os-Linux/drivers/tuntap_kern.c

   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
  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 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);