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slirp_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 <linux/string.h>
#include "net_kern.h"
#include "net_user.h"
#include "slirp.h"

struct slirp_init {
      struct arg_list_dummy_wrapper argw;  /* XXX should be simpler... */
};

void slirp_init(struct net_device *dev, void *data)
{
      struct uml_net_private *private;
      struct slirp_data *spri;
      struct slirp_init *init = data;
      int i;

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

      spri->argw = init->argw;
      spri->pid = -1;
      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("SLIRP backend - command line:");
      for (i = 0; spri->argw.argv[i] != NULL; i++)
            printk(" '%s'",spri->argw.argv[i]);
      printk("\n");
}

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

static int slirp_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
      return slirp_user_read(fd, skb_mac_header(skb), skb->dev->mtu,
                         (struct slirp_data *) &lp->user);
}

static int slirp_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
      return slirp_user_write(fd, skb->data, skb->len,
                        (struct slirp_data *) &lp->user);
}

const struct net_kern_info slirp_kern_info = {
      .init             = slirp_init,
      .protocol         = slirp_protocol,
      .read             = slirp_read,
      .write                  = slirp_write,
};

static int slirp_setup(char *str, char **mac_out, void *data)
{
      struct slirp_init *init = data;
      int i=0;

      *init = ((struct slirp_init) { .argw = { { "slirp", NULL  } } });

      str = split_if_spec(str, mac_out, NULL);

      if (str == NULL) /* no command line given after MAC addr */
            return 1;

      do {
            if (i >= SLIRP_MAX_ARGS - 1) {
                  printk(KERN_WARNING "slirp_setup: truncating slirp "
                         "arguments\n");
                  break;
            }
            init->argw.argv[i++] = str;
            while(*str && *str!=',') {
                  if (*str == '_')
                        *str=' ';
                  str++;
            }
            if (*str != ',')
                  break;
            *str++ = '\0';
      } while (1);

      init->argw.argv[i] = NULL;
      return 1;
}

static struct transport slirp_transport = {
      .list             = LIST_HEAD_INIT(slirp_transport.list),
      .name             = "slirp",
      .setup      = slirp_setup,
      .user             = &slirp_user_info,
      .kern             = &slirp_kern_info,
      .private_size     = sizeof(struct slirp_data),
      .setup_size       = sizeof(struct slirp_init),
};

static int register_slirp(void)
{
      register_transport(&slirp_transport);
      return 0;
}

late_initcall(register_slirp);

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