/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved  	*/

/*	THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T	*/
/*	The copyright notice above does not evidence any   	*/
/*	actual or intended publication of such source code.	*/

/*
 *		PROPRIETARY NOTICE (Combined)
 *
 *  This source code is unpublished proprietary information
 *  constituting, or derived under license from AT&T's Unix(r) System V.
 *  In addition, portions of such source code were derived from Berkeley
 *  4.3 BSD under license from the Regents of the University of
 *  California.
 *
 *
 *
 *		Copyright Notice
 *
 *  Notice of copyright on this source code product does not indicate
 *  publication.
 *
 *	Copyright (c) 1983-1989 by AT&T.
 *	All rights reserved.
 */
/*
 * Copyright 1986-2003 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef	_NETINET_ARP_H
#define	_NETINET_ARP_H

#pragma ident	"@(#)arp.h	1.5	03/08/17 SMI"

#ifdef	__cplusplus
extern "C" {
#endif

/*
 * 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 {
	ushort_t ar_hrd;	/* format of hardware address */
#define	ARPHRD_ETHER 	1	/* ethernet hardware address */
#define	ARPHRD_IB	32	/* IPoIB hardware address */
	ushort_t ar_pro;	/* format of protocol address */
	uchar_t	ar_hln;		/* length of hardware address */
	uchar_t	ar_pln;		/* length of protocol address */
	ushort_t ar_op;		/* one of: */
#define	ARPOP_REQUEST	1	/* request to resolve address */
#define	ARPOP_REPLY	2	/* response to previous request */
#define	REVARP_REQUEST	3	/* Reverse ARP request */
#define	REVARP_REPLY	4	/* Reverse ARP reply */
	/*
	 * The remaining fields are variable in size,
	 * according to the sizes above, and are defined
	 * as appropriate for specific hardware/protocol
	 * combinations.  (E.g., see <netinet/if_ether.h>.)
	 */
#ifdef	notdef
	uchar_t	ar_sha[];	/* sender hardware address */
	uchar_t	ar_spa[];	/* sender protocol address */
	uchar_t	ar_tha[];	/* target hardware address */
	uchar_t	ar_tpa[];	/* target protocol address */
#endif	/* notdef */
};

/*
 * Ethernet Address Resolution Protocol.
 *
 * See RFC 826 for protocol description.  Structure below is adapted
 * to resolving internet addresses.  Field names used correspond to
 * RFC 826.
 */
struct	ether_arp {
	struct	arphdr ea_hdr;		/* fixed-size header */
	struct ether_addr arp_sha;	/* sender hardware address */
	uchar_t	arp_spa[4];		/* sender protocol address */
	struct ether_addr arp_tha;	/* target hardware address */
	uchar_t	arp_tpa[4];		/* target protocol address */
};
#define	arp_hrd	ea_hdr.ar_hrd
#define	arp_pro	ea_hdr.ar_pro
#define	arp_hln	ea_hdr.ar_hln
#define	arp_pln	ea_hdr.ar_pln
#define	arp_op	ea_hdr.ar_op

/*
 * 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 */

#ifdef	__cplusplus
}
#endif

#endif	/* _NETINET_ARP_H */
