/*
 * Copyright 2007, Broadcom Corporation
 * All Rights Reserved.                
 *                                     
 * This is UNPUBLISHED PROPRIETARY SOURCE CODE of Broadcom Corporation;   
 * the contents of this file may not be disclosed to third parties, copied
 * or duplicated in any form, in whole or in part, without the prior      
 * written permission of Broadcom Corporation.                            
 *
 * Fundamental constants relating to ARP Protocol
 *
 * $Id$
 */

#ifndef _bcmarp_h_
#define _bcmarp_h_

/* enable structure packing */
#if defined(__GNUC__)
#define	PACKED	__attribute__((packed))
#else
#pragma pack(1)
#define	PACKED
#endif

#define ARP_OPC_OFFSET		6		/* option code offset */
#define ARP_SRC_ETH_OFFSET	8		/* src h/w address offset */
#define ARP_SRC_IP_OFFSET	14		/* src IP address offset */
#define ARP_TGT_ETH_OFFSET	18		/* target h/w address offset */
#define ARP_TGT_IP_OFFSET	24		/* target IP address offset */

#define ARP_OPC_REQUEST		1		/* ARP request */
#define ARP_OPC_REPLY		2		/* ARP reply */

#define ARP_DATA_LEN		28		/* ARP data length */

struct bcmarp {
	uint16	htype;				/* Header type (1 = ethernet) */
	uint16	ptype;				/* Protocol type (0x800 = IP) */
	uint8	hlen;				/* Hardware address length (Eth = 6) */
	uint8	plen;				/* Protocol address length (IP = 4) */
	uint16	oper;				/* ARP_OPC_... */
	uint8	src_eth[ETHER_ADDR_LEN];	/* Source hardware address */
	uint8	src_ip[IPV4_ADDR_LEN];		/* Source protocol address (not aligned) */
	uint8	dst_eth[ETHER_ADDR_LEN];	/* Destination hardware address */
	uint8	dst_ip[IPV4_ADDR_LEN];		/* Destination protocol address */
} PACKED;

/* Ethernet header + Arp message */
struct bcmetharp {
	struct ether_header	eh;
	struct bcmarp	arp;
} PACKED;

#undef PACKED
#if !defined(__GNUC__)
#pragma pack()
#endif

#endif	/* !defined(_bcmarp_h_) */