/*
   * NET3:	Fibre Channel device handling subroutines
   *
   *		This program is free software; you can redistribute it and/or
   *		modify it under the terms of the GNU General Public License
   *		as published by the Free Software Foundation; either version
   *		2 of the License, or (at your option) any later version.
   *
   *		Vineet Abraham <vma@iol.unh.edu>
   *		v 1.0 03/22/99
   */
  
  #include <asm/uaccess.h>
  #include <linux/types.h>
  #include <linux/kernel.h>
  #include <linux/string.h>
  #include <linux/mm.h>
  #include <linux/socket.h>
  #include <linux/in.h>
  #include <linux/inet.h>
  #include <linux/netdevice.h>
  #include <linux/fcdevice.h>
  #include <linux/skbuff.h>
  #include <linux/errno.h>
  #include <linux/timer.h>
  #include <linux/net.h>
  #include <linux/proc_fs.h>
  #include <linux/init.h>
  #include <linux/export.h>
  #include <net/arp.h>
  
  /*
   *	Put the headers on a Fibre Channel packet.
   */
  
  static int fc_header(struct sk_buff *skb, struct net_device *dev,
  		     unsigned short type,
  		     const void *daddr, const void *saddr, unsigned int len)
  {
  	struct fch_hdr *fch;
  	int hdr_len;
  
  	/*
  	 * Add the 802.2 SNAP header if IP as the IPv4 code calls
  	 * dev->hard_header directly.
  	 */
  	if (type == ETH_P_IP || type == ETH_P_ARP)
  	{
  		struct fcllc *fcllc;
  
  		hdr_len = sizeof(struct fch_hdr) + sizeof(struct fcllc);
  		fch = (struct fch_hdr *)skb_push(skb, hdr_len);
  		fcllc = (struct fcllc *)(fch+1);
  		fcllc->dsap = fcllc->ssap = EXTENDED_SAP;
  		fcllc->llc = UI_CMD;
  		fcllc->protid[0] = fcllc->protid[1] = fcllc->protid[2] = 0x00;
  		fcllc->ethertype = htons(type);
  	}
  	else
  	{
  		hdr_len = sizeof(struct fch_hdr);
  		fch = (struct fch_hdr *)skb_push(skb, hdr_len);
  	}
  
  	if(saddr)
  		memcpy(fch->saddr,saddr,dev->addr_len);
  	else
  		memcpy(fch->saddr,dev->dev_addr,dev->addr_len);
  
  	if(daddr)
  	{
  		memcpy(fch->daddr,daddr,dev->addr_len);
  		return hdr_len;
  	}
  	return -hdr_len;
  }
  
  /*
   *	A neighbour discovery of some species (eg arp) has completed. We
   *	can now send the packet.
   */
  
  static int fc_rebuild_header(struct sk_buff *skb)
  {
  #ifdef CONFIG_INET
  	struct fch_hdr *fch=(struct fch_hdr *)skb->data;
  	struct fcllc *fcllc=(struct fcllc *)(skb->data+sizeof(struct fch_hdr));
  	if(fcllc->ethertype != htons(ETH_P_IP)) {
  		printk("fc_rebuild_header: Don't know how to resolve type %04X addresses ?
  ", ntohs(fcllc->ethertype));
  		return 0;
  	}
  	return arp_find(fch->daddr, skb);
  #else
  	return 0;
  #endif
  }
  
  static const struct header_ops fc_header_ops = {
  	.create	 = fc_header,
  	.rebuild = fc_rebuild_header,
  };
  
  static void fc_setup(struct net_device *dev)
  {
  	dev->header_ops		= &fc_header_ops;
  	dev->type		= ARPHRD_IEEE802;
  	dev->hard_header_len	= FC_HLEN;
  	dev->mtu		= 2024;
  	dev->addr_len		= FC_ALEN;
  	dev->tx_queue_len	= 100; /* Long queues on fc */
  	dev->flags		= IFF_BROADCAST;
  
  	memset(dev->broadcast, 0xFF, FC_ALEN);
  }
  
  /**
   * alloc_fcdev - Register fibre channel device
   * @sizeof_priv: Size of additional driver-private structure to be allocated
   *	for this fibre channel device
   *
   * Fill in the fields of the device structure with fibre channel-generic values.
   *
   * Constructs a new net device, complete with a private data area of
   * size @sizeof_priv.  A 32-byte (not bit) alignment is enforced for
   * this private data area.
   */
  struct net_device *alloc_fcdev(int sizeof_priv)
  {
  	return alloc_netdev(sizeof_priv, "fc%d", fc_setup);
  }
  EXPORT_SYMBOL(alloc_fcdev);