/*
 * Copyright (c) 1986 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *	@(#)if_arp.h    7.3 (Berkeley) 6/27/88
 */

/*
 * 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 */
	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 */
};

/*
 * ARP ioctl request
 */
#ifdef __AMITCP__
#define MAXADDRARP  16		/* Maximum number of octets in hw address */
struct arpreq {
	struct	sockaddr arp_pa;		/* protocol address */
	struct	{				/* hardware address */
	  u_char sa_len;
	  u_char sa_family;
	  char	 sa_data[MAXADDRARP];
	}  arp_ha;
	int	arp_flags;			/* flags */
};
#else /* AS225R2 */
struct arpreq {
	struct	sockaddr arp_pa;		/* protocol address */
	struct	sockaddr arp_ha;		/* hardware address */
	int	arp_flags;			/* flags */
};
#endif
/*  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 */

/*
 * An AmiTCP/IP specific ARP table ioctl request
 */
#ifdef __AMITCP__
struct arptabreq {
	struct arpreq  atr_arpreq; /* We want to identify the interface */
	long	       atr_size;	  /* # of elements in art_table */
	long	       atr_inuse;		/* # of elements in use */
	struct arpreq *atr_table;
};
#endif