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slip_kern.c

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

#include <linux/if_arp.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include "net_kern.h"
#include "slip.h"

struct slip_init {
      char *gate_addr;
};

static void slip_init(struct net_device *dev, void *data)
{
      struct uml_net_private *private;
      struct slip_data *spri;
      struct slip_init *init = data;

      private = dev->priv;
      spri = (struct slip_data *) private->user;

      memset(spri->name, 0, sizeof(spri->name));
      spri->addr = NULL;
      spri->gate_addr = init->gate_addr;
      spri->slave = -1;
      spri->dev = dev;

      slip_proto_init(&spri->slip);

      dev->init = NULL;
      dev->hard_header_len = 0;
      dev->header_ops = NULL;
      dev->addr_len = 0;
      dev->type = ARPHRD_SLIP;
      dev->tx_queue_len = 256;
      dev->flags = IFF_NOARP;
      printk("SLIP backend - SLIP IP = %s\n", spri->gate_addr);
}

static unsigned short slip_protocol(struct sk_buff *skbuff)
{
      return htons(ETH_P_IP);
}

static int slip_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
      return slip_user_read(fd, skb_mac_header(skb), skb->dev->mtu,
                        (struct slip_data *) &lp->user);
}

static int slip_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
      return slip_user_write(fd, skb->data, skb->len,
                         (struct slip_data *) &lp->user);
}

static const struct net_kern_info slip_kern_info = {
      .init             = slip_init,
      .protocol         = slip_protocol,
      .read             = slip_read,
      .write                  = slip_write,
};

static int slip_setup(char *str, char **mac_out, void *data)
{
      struct slip_init *init = data;

      *init = ((struct slip_init) { .gate_addr = NULL });

      if (str[0] != '\0')
            init->gate_addr = str;
      return 1;
}

static struct transport slip_transport = {
      .list             = LIST_HEAD_INIT(slip_transport.list),
      .name             = "slip",
      .setup      = slip_setup,
      .user             = &slip_user_info,
      .kern             = &slip_kern_info,
      .private_size     = sizeof(struct slip_data),
      .setup_size       = sizeof(struct slip_init),
};

static int register_slip(void)
{
      register_transport(&slip_transport);
      return 0;
}

late_initcall(register_slip);

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