/*
**      $Filename: net/if_arp.h $
**      $Release$
**      $Revision: 3.1 $
**      $Date: 1994/02/03 19:18:17 $
**
**      Interface to the Address Resolution Protocol
**
**      Copyright © 1993,1994 AmiTCP/IP Group, <AmiTCP-Group@hut.fi>
**                  Helsinki University of Technology, Finland.
**                  All rights reserved.
*/

/*
 * 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.
 */
#define ARPHRD_ETHER    1       /* ethernet hardware address */
#define ARPHRD_ARCNET   7       /* ARCNET hardware address */

#define ARPOP_REQUEST   1       /* request to resolve address */
#define ARPOP_REPLY     2       /* response to previous request */

OBJECT arphdr
    ar_hrd:UWORD,         /* format of hardware address */
    ar_pro:UWORD,         /* format of protocol address */
    ar_hln:UBYTE,         /* length of hardware address */
    ar_pln:UBYTE,         /* length of protocol address */
    ar_op:UWORD          /* one of: */
/*
 * 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 */

#define MAXADDRARP  16          /* Maximum number of octets in hw address */

/*
 * ARP ioctl request. 
 */
OBJECT arpreq
    arp_pa:sockaddr,                /* protocol address */
    OBJECT arp_ha                           /* hardware address */
        sa_len:UBYTE,
        sa_family:UBYTE,
        sa_data[MAXADDRARP]:BYTE
    ENDOBJECT,
    arp_flags:ULONG                      /* flags */


/*  arp_flags and at_flags field values */
#define ATF_INUSE       $01    /* entry in use */
#define ATF_COM         $02    /* completed entry (enaddr valid) */
#define ATF_PERM        $04    /* permanent entry */
#define ATF_PUBL        $08    /* publish entry (respond for other host) */
#define ATF_USETRAILERS $10    /* has requested trailers */

/* 
 * An AmiTCP/IP specific ARP table ioctl request
 */
OBJECT arptabreq
    atr_arpreq:arpreq, /* We want to identify the interface */
    atr_size:LONG,          /* # of elements in art_table */
    atr_inuse:LONG,               /* # of elements in use */
    atr_table:PTR TO arpreq
/*
 * Copyright (c) 1986 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)if_arp.h    7.4 (Berkeley) 6/28/90
 */



