/*
   * Copyright (C) 2007 Luca Bigliardi (shammash@artha.org).
   * Licensed under the GPL.
   *
   * Transport usage:
   *  ethN=vde,<vde_switch>,<mac addr>,<port>,<group>,<mode>,<description>
   *
   */

  #include "linux/init.h"

  #include <linux/netdevice.h>

  #include "net_kern.h"
  #include "net_user.h"
  #include "vde.h"
  
  static void vde_init(struct net_device *dev, void *data)
  {
  	struct vde_init *init = data;
  	struct uml_net_private *pri;
  	struct vde_data *vpri;

  	pri = netdev_priv(dev);

  	vpri = (struct vde_data *) pri->user;
  
  	vpri->vde_switch = init->vde_switch;
  	vpri->descr = init->descr ? init->descr : "UML vde_transport";
  	vpri->args = NULL;
  	vpri->conn = NULL;
  	vpri->dev = dev;

  	printk("vde backend - %s, ", vpri->vde_switch ?

  	       vpri->vde_switch : "(default socket)");
  
  	vde_init_libstuff(vpri, init);

  	printk("
  ");

  }

  static int vde_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)

  {
  	struct vde_data *pri = (struct vde_data *) &lp->user;

  	if (pri->conn != NULL)
  		return vde_user_read(pri->conn, skb_mac_header(skb),
  				     skb->dev->mtu + ETH_HEADER_OTHER);

  
  	printk(KERN_ERR "vde_read - we have no VDECONN to read from");
  	return -EBADF;
  }

  static int vde_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)

  {
  	struct vde_data *pri = (struct vde_data *) &lp->user;
  
  	if (pri->conn != NULL)

  		return vde_user_write((void *)pri->conn, skb->data,
  				      skb->len);

  
  	printk(KERN_ERR "vde_write - we have no VDECONN to write to");
  	return -EBADF;
  }
  
  static const struct net_kern_info vde_kern_info = {
  	.init			= vde_init,
  	.protocol		= eth_protocol,
  	.read			= vde_read,
  	.write			= vde_write,
  };
  
  static int vde_setup(char *str, char **mac_out, void *data)
  {
  	struct vde_init *init = data;
  	char *remain, *port_str = NULL, *mode_str = NULL, *last;
  
  	*init = ((struct vde_init)
  		{ .vde_switch		= NULL,
  		  .descr		= NULL,
  		  .port			= 0,
  		  .group		= NULL,
  		  .mode			= 0 });
  
  	remain = split_if_spec(str, &init->vde_switch, mac_out, &port_str,
  				&init->group, &mode_str, &init->descr, NULL);
  
  	if (remain != NULL)
  		printk(KERN_WARNING "vde_setup - Ignoring extra data :"
  		       "'%s'
  ", remain);
  
  	if (port_str != NULL) {
  		init->port = simple_strtoul(port_str, &last, 10);
  		if ((*last != '\0') || (last == port_str)) {
  			printk(KERN_ERR "vde_setup - Bad port : '%s'
  ",
  						port_str);
  			return 0;
  		}
  	}
  
  	if (mode_str != NULL) {
  		init->mode = simple_strtoul(mode_str, &last, 8);
  		if ((*last != '\0') || (last == mode_str)) {
  			printk(KERN_ERR "vde_setup - Bad mode : '%s'
  ",
  						mode_str);
  			return 0;
  		}
  	}
  
  	printk(KERN_INFO "Configured vde device: %s
  ", init->vde_switch ?
  	       init->vde_switch : "(default socket)");
  
  	return 1;
  }
  
  static struct transport vde_transport = {
  	.list 		= LIST_HEAD_INIT(vde_transport.list),
  	.name 		= "vde",
  	.setup  	= vde_setup,
  	.user 		= &vde_user_info,
  	.kern 		= &vde_kern_info,
  	.private_size 	= sizeof(struct vde_data),
  	.setup_size 	= sizeof(struct vde_init),
  };
  
  static int register_vde(void)
  {
  	register_transport(&vde_transport);
  	return 0;
  }
  
  late_initcall(register_vde);