/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		HIPPI-type device handling.
 *
 * Version:	@(#)hippi.c	1.0.0	05/29/97
 *
 * Authors:	Ross Biro, <bir7@leland.Stanford.Edu>
 *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *		Mark Evans, <evansmp@uhura.aston.ac.uk>
 *		Florian  La Roche, <rzsfl@rz.uni-sb.de>
 *		Alan Cox, <gw4pts@gw4pts.ampr.org>
 *		Jes Sorensen, <Jes.Sorensen@cern.ch>
 *
 *		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.
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.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/hippidevice.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
#include <net/arp.h>
#include <net/sock.h>
#include <asm/uaccess.h>
#include <asm/checksum.h>
#include <asm/segment.h>
#include <asm/system.h>

/*
 * hippi_net_init()
 *
 * Do nothing, this is just to pursuade the stupid linker to behave.
 */

void hippi_net_init(void)
{
	return;
}

/*
 * Create the HIPPI MAC header for an arbitrary protocol layer 
 *
 * saddr=NULL	means use device source address
 * daddr=NULL	means leave destination address (eg unresolved arp)
 */

int hippi_header(struct sk_buff *skb, struct device *dev,
		 unsigned short type, void *daddr, void *saddr,
		 unsigned len)
{
	struct hippi_hdr *hip = (struct hippi_hdr *)skb_push(skb, HIPPI_HLEN);

	if (!len){
		len = skb->len - HIPPI_HLEN;
		printk("hippi_header(): length not supplied\n");
	}

	/*
	 * Due to the stupidity of the little endian byte-order we
	 * have to set the fp field this way.
	 */
	hip->fp.fixed		= __constant_htonl(0x04800018);
	hip->fp.d2_size		= htonl(len + 8);
	hip->le.fc		= 0;
	hip->le.double_wide	= 0;	/* only HIPPI 800 for the time being */
	hip->le.message_type	= 0;	/* Data PDU */

	hip->le.dest_addr_type	= 2;	/* 12 bit SC address */
	hip->le.src_addr_type	= 2;	/* 12 bit SC address */

	memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3);
	memset(&hip->le.reserved, 0, 16);

	hip->snap.dsap		= HIPPI_EXTENDED_SAP;
	hip->snap.ssap		= HIPPI_EXTENDED_SAP;
	hip->snap.ctrl		= HIPPI_UI_CMD;
	hip->snap.oui[0]	= 0x00;
	hip->snap.oui[1]	= 0x00;
	hip->snap.oui[2]	= 0x00;
	hip->snap.ethertype	= htons(type);

	if (daddr)
	{
		memcpy(hip->le.dest_switch_addr, daddr + 3, 3);
		memcpy(&skb->private.ifield, daddr + 2, 4);
		return HIPPI_HLEN;
	}
	return -HIPPI_HLEN;
}


/*
 * Rebuild the HIPPI MAC header. This is called after an ARP has
 * completed on this sk_buff. We now let ARP fill in the other fields.
 */

int hippi_rebuild_header(struct sk_buff *skb)
{
	struct hippi_hdr *hip = (struct hippi_hdr *)skb->data;

	/*
	 * Only IP is currently supported
	 */
	 
	if(hip->snap.ethertype != __constant_htons(ETH_P_IP)) 
	{
		printk(KERN_DEBUG "%s: unable to resolve type %X addresses.\n",skb->dev->name,ntohs(hip->snap.ethertype));
		return 0;
	}

	/*
	 * We don't support dynamic ARP on HIPPI, but we use the ARP
	 * static ARP tables to hold the I-FIELDs.
	 */
	return arp_find(hip->le.daddr, skb);
}


/*
 *	Determine the packet's protocol ID.
 */
 
unsigned short hippi_type_trans(struct sk_buff *skb, struct device *dev)
{
	struct hippi_hdr *hip;
	
	hip = (struct hippi_hdr *) skb->data;

	/*
	 * This is actually wrong ... question is if we really should
	 * set the raw address here.
	 */
	 skb->mac.raw = skb->data;
	 skb_pull(skb, HIPPI_HLEN);

	/*
	 * No fancy promisc stuff here now.
	 */

	return hip->snap.ethertype;
}
