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/*

 * 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. 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    8.1 (Berkeley) 6/10/93

 * $FreeBSD: src/sys/net/if_arp.h,v 1.16 2001/10/14 20:17:52 fjoe Exp $

 */

#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_short ar_hrd;         /* format of hardware address */

#define ARPHRD_ETHER    1       /* ethernet hardware format */

#define ARPHRD_IEEE802  6       /* token-ring hardware format */

#define ARPHRD_ARCNET   7       /* arcnet hardware format */

#define ARPHRD_FRELAY   15      /* frame relay hardware format */

        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 */

#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_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 */

#endif

};

#define ar_sha(ap)      (((caddr_t)((ap)+1)) +   0)

#define ar_spa(ap)      (((caddr_t)((ap)+1)) +   (ap)->ar_hln)

#define ar_tha(ap)      (((caddr_t)((ap)+1)) +   (ap)->ar_hln + (ap)->ar_pln)

#define ar_tpa(ap)      (((caddr_t)((ap)+1)) + 2*(ap)->ar_hln + (ap)->ar_pln)

#define arphdr_len2(ar_hln, ar_pln)                                     \

        (sizeof(struct arphdr) + 2*(ar_hln) + 2*(ar_pln))

#define arphdr_len(ap)  (arphdr_len2((ap)->ar_hln, (ap)->ar_pln))

/*

 * 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 _KERNEL

/*

 * Structure shared between the ethernet driver modules and

 * the address resolution code.  For example, each ec_softc or il_softc

 * begins with this structure.

 */

struct  arpcom {

        /*

         * The ifnet struct _must_ be at the head of this structure.

         */

        struct  ifnet ac_if;            /* network-visible interface */

        u_char  ac_enaddr[6];           /* ethernet hardware address */

        int     ac_multicnt;            /* length of ac_multiaddrs list */

        void    *ac_netgraph;           /* ng_ether(4) netgraph node info */

};

extern u_char   etherbroadcastaddr[6];

#endif

#endif /* !_NET_IF_ARP_H_ */