FreeBSD/Linux Kernel Cross Reference
sys/net/if_arp.h

     /*      $OpenBSD: if_arp.h,v 1.7 2017/01/24 10:08:30 krw Exp $  */
     /*      $NetBSD: if_arp.h,v 1.8 1995/03/08 02:56:52 cgd Exp $   */
     
     /*
      * Copyright (c) 1986, 1993
      *      The 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. 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    8.1 (Berkeley) 6/10/93
     */
    
    #ifndef _NET_IF_ARP_H_
    #define _NET_IF_ARP_H_
    /*
     * 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_int16_t ar_hrd;       /* format of hardware address */
    #define ARPHRD_ETHER    1       /* ethernet hardware format */
    #define ARPHRD_IEEE802  6       /* IEEE 802 hardware format */
    #define ARPHRD_FRELAY   15      /* frame relay hardware format */
    #define ARPHRD_IEEE1394 24      /* IEEE 1394 (FireWire) hardware format */
            u_int16_t ar_pro;       /* format of protocol address */
            u_int8_t  ar_hln;       /* length of hardware address */
            u_int8_t  ar_pln;       /* length of protocol address */
            u_int16_t ar_op;        /* one of: */
    #define ARPOP_REQUEST   1       /* request to resolve address */
    #define ARPOP_REPLY     2       /* response to previous request */
    #define ARPOP_REVREQUEST 3      /* request protocol address given hardware */
    #define ARPOP_REVREPLY  4       /* response giving protocol address */
    #define ARPOP_INVREQUEST 8      /* request to identify peer */
    #define ARPOP_INVREPLY  9       /* response identifying peer */
    /*
     * The remaining fields are variable in size,
     * according to the sizes above.
     */
    #ifdef COMMENT_ONLY
            u_int8_t  ar_sha[];     /* sender hardware address */
            u_int8_t  ar_spa[];     /* sender protocol address */
            u_int8_t  ar_tha[];     /* target hardware address */
            u_int8_t  ar_tpa[];     /* target protocol address */
    #endif
    };
    
    /*
     * 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 */
    #endif /* _NET_IF_ARP_H_ */

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