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tuntap_kern.c

/*
 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#include <linux/netdevice.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <asm/errno.h>
#include "net_kern.h"
#include "tuntap.h"

struct tuntap_init {
      char *dev_name;
      char *gate_addr;
};

static void tuntap_init(struct net_device *dev, void *data)
{
      struct uml_net_private *pri;
      struct tuntap_data *tpri;
      struct tuntap_init *init = data;

      pri = dev->priv;
      tpri = (struct tuntap_data *) pri->user;
      tpri->dev_name = init->dev_name;
      tpri->fixed_config = (init->dev_name != NULL);
      tpri->gate_addr = init->gate_addr;
      tpri->fd = -1;
      tpri->dev = dev;

      printk("TUN/TAP backend - ");
      if (tpri->gate_addr != NULL)
            printk("IP = %s", tpri->gate_addr);
      printk("\n");
}

static int tuntap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
      return net_read(fd, skb_mac_header(skb),
                  skb->dev->mtu + ETH_HEADER_OTHER);
}

static int tuntap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
      return net_write(fd, skb->data, skb->len);
}

const struct net_kern_info tuntap_kern_info = {
      .init             = tuntap_init,
      .protocol         = eth_protocol,
      .read             = tuntap_read,
      .write                  = tuntap_write,
};

int tuntap_setup(char *str, char **mac_out, void *data)
{
      struct tuntap_init *init = data;

      *init = ((struct tuntap_init)
            { .dev_name       = NULL,
              .gate_addr      = NULL });
      if (tap_setup_common(str, "tuntap", &init->dev_name, mac_out,
                      &init->gate_addr))
            return 0;

      return 1;
}

static struct transport tuntap_transport = {
      .list             = LIST_HEAD_INIT(tuntap_transport.list),
      .name             = "tuntap",
      .setup      = tuntap_setup,
      .user             = &tuntap_user_info,
      .kern             = &tuntap_kern_info,
      .private_size     = sizeof(struct tuntap_data),
      .setup_size       = sizeof(struct tuntap_init),
};

static int register_tuntap(void)
{
      register_transport(&tuntap_transport);
      return 0;
}

late_initcall(register_tuntap);

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