git.oblomov.eu Git - linux-2.6/blob - 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 = dev->priv;
  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("TUN/TAP backend - ");
  33         if (tpri->gate_addr != NULL)
  34                 printk("IP = %s", tpri->gate_addr);
  35         printk("\n");
  36 }
  37
  38 static int tuntap_read(int fd, struct sk_buff **skb,
  39                        struct uml_net_private *lp)
  40 {
  41         *skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
  42         if (*skb == NULL)
  43                 return -ENOMEM;
  44         return net_read(fd, skb_mac_header(*skb),
  45                         (*skb)->dev->mtu + ETH_HEADER_OTHER);
  46 }
  47
  48 static int tuntap_write(int fd, struct sk_buff **skb,
  49                         struct uml_net_private *lp)
  50 {
  51         return net_write(fd, (*skb)->data, (*skb)->len);
  52 }
  53
  54 const struct net_kern_info tuntap_kern_info = {
  55         .init                   = tuntap_init,
  56         .protocol               = eth_protocol,
  57         .read                   = tuntap_read,
  58         .write                  = tuntap_write,
  59 };
  60
  61 int tuntap_setup(char *str, char **mac_out, void *data)
  62 {
  63         struct tuntap_init *init = data;
  64
  65         *init = ((struct tuntap_init)
  66                 { .dev_name     = NULL,
  67                   .gate_addr    = NULL });
  68         if (tap_setup_common(str, "tuntap", &init->dev_name, mac_out,
  69                             &init->gate_addr))
  70                 return 0;
  71
  72         return 1;
  73 }
  74
  75 static struct transport tuntap_transport = {
  76         .list           = LIST_HEAD_INIT(tuntap_transport.list),
  77         .name           = "tuntap",
  78         .setup          = tuntap_setup,
  79         .user           = &tuntap_user_info,
  80         .kern           = &tuntap_kern_info,
  81         .private_size   = sizeof(struct tuntap_data),
  82         .setup_size     = sizeof(struct tuntap_init),
  83 };
  84
  85 static int register_tuntap(void)
  86 {
  87         register_transport(&tuntap_transport);
  88         return 0;
  89 }
  90
  91 late_initcall(register_tuntap);