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

   1 /*
   2  * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include "linux/stddef.h"
   7 #include "linux/netdevice.h"
   8 #include "linux/etherdevice.h"
   9 #include "linux/skbuff.h"
  10 #include "linux/init.h"
  11 #include "asm/errno.h"
  12 #include "net_kern.h"
  13 #include "net_user.h"
  14 #include "tuntap.h"
  15
  16 struct tuntap_init {
  17         char *dev_name;
  18         char *gate_addr;
  19 };
  20
  21 static void tuntap_init(struct net_device *dev, void *data)
  22 {
  23         struct uml_net_private *pri;
  24         struct tuntap_data *tpri;
  25         struct tuntap_init *init = data;
  26
  27         pri = dev->priv;
  28         tpri = (struct tuntap_data *) pri->user;
  29         tpri->dev_name = init->dev_name;
  30         tpri->fixed_config = (init->dev_name != NULL);
  31         tpri->gate_addr = init->gate_addr;
  32         tpri->fd = -1;
  33         tpri->dev = dev;
  34
  35         printk("TUN/TAP backend - ");
  36         if (tpri->gate_addr != NULL)
  37                 printk("IP = %s", tpri->gate_addr);
  38         printk("\n");
  39 }
  40
  41 static int tuntap_read(int fd, struct sk_buff **skb,
  42                        struct uml_net_private *lp)
  43 {
  44         *skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
  45         if(*skb == NULL) return(-ENOMEM);
  46         return(net_read(fd, (*skb)->mac.raw,
  47                         (*skb)->dev->mtu + ETH_HEADER_OTHER));
  48 }
  49
  50 static int tuntap_write(int fd, struct sk_buff **skb,
  51                         struct uml_net_private *lp)
  52 {
  53         return(net_write(fd, (*skb)->data, (*skb)->len));
  54 }
  55
  56 const struct net_kern_info tuntap_kern_info = {
  57         .init                   = tuntap_init,
  58         .protocol               = eth_protocol,
  59         .read                   = tuntap_read,
  60         .write                  = tuntap_write,
  61 };
  62
  63 int tuntap_setup(char *str, char **mac_out, void *data)
  64 {
  65         struct tuntap_init *init = data;
  66
  67         *init = ((struct tuntap_init)
  68                 { .dev_name     = NULL,
  69                   .gate_addr    = NULL });
  70         if(tap_setup_common(str, "tuntap", &init->dev_name, mac_out,
  71                             &init->gate_addr))
  72                 return(0);
  73
  74         return(1);
  75 }
  76
  77 static struct transport tuntap_transport = {
  78         .list           = LIST_HEAD_INIT(tuntap_transport.list),
  79         .name           = "tuntap",
  80         .setup          = tuntap_setup,
  81         .user           = &tuntap_user_info,
  82         .kern           = &tuntap_kern_info,
  83         .private_size   = sizeof(struct tuntap_data),
  84         .setup_size     = sizeof(struct tuntap_init),
  85 };
  86
  87 static int register_tuntap(void)
  88 {
  89         register_transport(&tuntap_transport);
  90         return 0;
  91 }
  92
  93 late_initcall(register_tuntap);