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if_arp.h

/*
 * 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 1.10.2.2 1999/08/29 16:28:15 peter 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_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
};

/*
 * 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 */
};

extern u_char     etherbroadcastaddr[6];
#endif

#endif /* !_NET_IF_ARP_H_ */

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