linux/arch/um/drivers/slip_kern.c
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   1/*
   2 * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   3 * Licensed under the GPL.
   4 */
   5
   6#include <linux/if_arp.h>
   7#include <linux/init.h>
   8#include <linux/netdevice.h>
   9#include "net_kern.h"
  10#include "slip.h"
  11
  12struct slip_init {
  13        char *gate_addr;
  14};
  15
  16static void slip_init(struct net_device *dev, void *data)
  17{
  18        struct uml_net_private *private;
  19        struct slip_data *spri;
  20        struct slip_init *init = data;
  21
  22        private = netdev_priv(dev);
  23        spri = (struct slip_data *) private->user;
  24
  25        memset(spri->name, 0, sizeof(spri->name));
  26        spri->addr = NULL;
  27        spri->gate_addr = init->gate_addr;
  28        spri->slave = -1;
  29        spri->dev = dev;
  30
  31        slip_proto_init(&spri->slip);
  32
  33        dev->hard_header_len = 0;
  34        dev->header_ops = NULL;
  35        dev->addr_len = 0;
  36        dev->type = ARPHRD_SLIP;
  37        dev->tx_queue_len = 256;
  38        dev->flags = IFF_NOARP;
  39        printk("SLIP backend - SLIP IP = %s\n", spri->gate_addr);
  40}
  41
  42static unsigned short slip_protocol(struct sk_buff *skbuff)
  43{
  44        return htons(ETH_P_IP);
  45}
  46
  47static int slip_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
  48{
  49        return slip_user_read(fd, skb_mac_header(skb), skb->dev->mtu,
  50                              (struct slip_data *) &lp->user);
  51}
  52
  53static int slip_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
  54{
  55        return slip_user_write(fd, skb->data, skb->len,
  56                               (struct slip_data *) &lp->user);
  57}
  58
  59static const struct net_kern_info slip_kern_info = {
  60        .init                   = slip_init,
  61        .protocol               = slip_protocol,
  62        .read                   = slip_read,
  63        .write                  = slip_write,
  64};
  65
  66static int slip_setup(char *str, char **mac_out, void *data)
  67{
  68        struct slip_init *init = data;
  69
  70        *init = ((struct slip_init) { .gate_addr = NULL });
  71
  72        if (str[0] != '\0')
  73                init->gate_addr = str;
  74        return 1;
  75}
  76
  77static struct transport slip_transport = {
  78        .list           = LIST_HEAD_INIT(slip_transport.list),
  79        .name           = "slip",
  80        .setup          = slip_setup,
  81        .user           = &slip_user_info,
  82        .kern           = &slip_kern_info,
  83        .private_size   = sizeof(struct slip_data),
  84        .setup_size     = sizeof(struct slip_init),
  85};
  86
  87static int register_slip(void)
  88{
  89        register_transport(&slip_transport);
  90        return 0;
  91}
  92
  93late_initcall(register_slip);
  94
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