LXR linux/arch/um/os-Linux/drivers/ethertap

   1/*
   2 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
   3 * James Leu (jleu@mindspring.net).
   4 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   5 * Copyright (C) 2001 by various other people who didn't put their name here.
   6 * Licensed under the GPL.
   7 */
   8
   9#include <linux/init.h>
  10#include <linux/netdevice.h>
  11#include "etap.h"
  12#include <net_kern.h>
  13
  14struct ethertap_init {
  15        char *dev_name;
  16        char *gate_addr;
  17};
  18
  19static void etap_init(struct net_device *dev, void *data)
  20{
  21        struct uml_net_private *pri;
  22        struct ethertap_data *epri;
  23        struct ethertap_init *init = data;
  24
  25        pri = netdev_priv(dev);
  26        epri = (struct ethertap_data *) pri->user;
  27        epri->dev_name = init->dev_name;
  28        epri->gate_addr = init->gate_addr;
  29        epri->data_fd = -1;
  30        epri->control_fd = -1;
  31        epri->dev = dev;
  32
  33        printk(KERN_INFO "ethertap backend - %s", epri->dev_name);
  34        if (epri->gate_addr != NULL)
  35                printk(KERN_CONT ", IP = %s", epri->gate_addr);
  36        printk(KERN_CONT "\n");
  37}
  38
  39static int etap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
  40{
  41        int len;
  42
  43        len = net_recvfrom(fd, skb_mac_header(skb),
  44                           skb->dev->mtu + 2 + ETH_HEADER_ETHERTAP);
  45        if (len <= 0)
  46                return(len);
  47
  48        skb_pull(skb, 2);
  49        len -= 2;
  50        return len;
  51}
  52
  53static int etap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
  54{
  55        skb_push(skb, 2);
  56        return net_send(fd, skb->data, skb->len);
  57}
  58
  59const struct net_kern_info ethertap_kern_info = {
  60        .init                   = etap_init,
  61        .protocol               = eth_protocol,
  62        .read                   = etap_read,
  63        .write                  = etap_write,
  64};
  65
  66int ethertap_setup(char *str, char **mac_out, void *data)
  67{
  68        struct ethertap_init *init = data;
  69
  70        *init = ((struct ethertap_init)
  71                { .dev_name     = NULL,
  72                  .gate_addr    = NULL });
  73        if (tap_setup_common(str, "ethertap", &init->dev_name, mac_out,
  74                            &init->gate_addr))
  75                return 0;
  76        if (init->dev_name == NULL) {
  77                printk(KERN_ERR "ethertap_setup : Missing tap device name\n");
  78                return 0;
  79        }
  80
  81        return 1;
  82}
  83
  84static struct transport ethertap_transport = {
  85        .list           = LIST_HEAD_INIT(ethertap_transport.list),
  86        .name           = "ethertap",
  87        .setup          = ethertap_setup,
  88        .user           = &ethertap_user_info,
  89        .kern           = &ethertap_kern_info,
  90        .private_size   = sizeof(struct ethertap_data),
  91        .setup_size     = sizeof(struct ethertap_init),
  92};
  93
  94static int register_ethertap(void)
  95{
  96        register_transport(&ethertap_transport);
  97        return 0;
  98}
  99
 100late_initcall(register_ethertap);
 101