#ifndef __IF_ARP_LOADED
#define __IF_ARP_LOADED 1
/****************************************************************************
**
**  <if_arp.h> - Structures for the Address Resolution Protocol
**
*****************************************************************************
**  Header is nonstandard
*****************************************************************************
**
**  Copyright 2000 Compaq Computer Corporation
**
**  Compaq and the Compaq logo Registered in U.S. Patent and Trademark Office.
**
**  Confidential computer software. Valid license from Compaq required for
**  possession, use or copying. Consistent with FAR 12.211 and 12.212,
**  Commercial Computer Software, Computer Software Documentation, and
**  Technical Data for Commercial Items are licensed to the U.S. Government
**  under vendor's standard commercial license.
**
******************************************************************************
**
**  Copyright (c) 1982, 1993 Regents of the University of California.
**  All rights reserved.  The Berkeley software License Agreement
**  specifies the terms and conditions for redistribution.
**
**      if_arp.h           8.1 (Berkeley) 6/10/93
**
******************************************************************************
*/

#pragma   __nostandard
#include <decc$types.h>
#ifdef __cplusplus
    extern "C" {
#endif

#include <socket.h>

#if __INITIAL_POINTER_SIZE
#   pragma __pointer_size __save
#   pragma __pointer_size 32
#endif


/*
**  All structures should be member aligned on natural boundaries
*/
#pragma __member_alignment __save
#pragma __member_alignment


/*
**  External model of relaxed refdef
*/
#pragma __extern_model __save
#pragma __extern_model __relaxed_refdef


/*
 * Address Resolution Protocol.
 *
 * See RFC 826 for protocol description.  ARP packets are variable
 * in size; the arphdr structure defines the fixed-length portion.
 * Protocol type values are the same as those for 10 Mb/s Ethernet.
 * It is followed by the variable-sized fields ar_sha, arp_spa,
 * arp_tha and arp_tpa in that order, according to the lengths
 * specified.  Field names used correspond to RFC 826.
 */
struct	arphdr {
	u_short	ar_hrd;		/* format of hardware address */
#define ARPHRD_ETHER 	1	/* ethernet hardware address */
#define ARPHRD_802	6	/* 802 net hardware address */
	u_short	ar_pro;		/* format of protocol address */
	u_char	ar_hln;		/* length of hardware address */
	u_char	ar_pln;		/* length of protocol address */
	u_short	ar_op;		/* one of: */
#define	ARPOP_REQUEST	1	/* request to resolve address */
#define	ARPOP_REPLY	2	/* response to previous request */
/*
 * The remaining fields are variable in size,
 * according to the sizes above.
 */
/*	u_char	ar_sha[];	   sender hardware address */
/*	u_char	ar_spa[];	   sender protocol address */
/*	u_char	ar_tha[];	   target hardware address */
/*	u_char	ar_tpa[];	   target protocol address */
};

/* For indexing into arbitrary ha/pa ARP headers */
#define AR_SHA(ah)	((u_char *)((ah)+1))
#define AR_SPA(ah)	(AR_SHA(ah)+(ah)->ar_hln)
#define AR_THA(ah)	(AR_SPA(ah)+(ah)->ar_pln)
#define AR_TPA(ah)	(AR_THA(ah)+(ah)->ar_hln)

/*
 * ARP ioctl request
 */
struct arpreq {
	struct	sockaddr arp_pa;		/* protocol address */
	struct	sockaddr arp_ha;		/* hardware address */
	int	arp_flags;			/* flags */
};
/*  arp_flags and at_flags field values */
#define	ATF_INUSE	0x01	/* entry in use */
#define ATF_COM		0x02	/* completed entry (enaddr valid) */
#define	ATF_PERM	0x04	/* permanent entry */
#define	ATF_PUBL	0x08	/* publish entry (respond for other host) */
#define	ATF_USETRAILERS	0x10	/* has requested trailers */
#define	ATF_USE802	0x20	/* host using 802 framing */
#define ATF_STALE	0x0100	/* entry needs to be refreshed */
#define ATF_DEAD	0x0200	/* entry (host) failed to refresh */

#define ATF_CANTCHANGE	(0xff00|ATF_INUSE|ATF_COM)


/*
**  Restore the users pointer context
*/
#if __INITIAL_POINTER_SIZE
#   pragma __pointer_size __restore
#endif

#ifdef __cplusplus
    }
#endif
#pragma __member_alignment __restore
#pragma __extern_model __restore
#pragma __standard
#endif  /* __IF_ARP_LOADED  */