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

     /*      $NetBSD: if_arp.h,v 1.25 2005/12/10 23:21:38 elad 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_ARCNET   7       /* ethernet hardware format */
    #define ARPHRD_FRELAY   15      /* frame relay hardware format */
    #define ARPHRD_STRIP    23      /* Ricochet Starmode Radio 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
    #define ar_sha(ap) (((caddr_t)((ap)+1))+0)
    #define ar_spa(ap) (((caddr_t)((ap)+1))+(ap)->ar_hln)
    #define ar_tha(ap) \
            (ntohs((ap)->ar_hrd) == ARPHRD_IEEE1394 \
                    ? NULL : (((caddr_t)((ap)+1))+(ap)->ar_hln+(ap)->ar_pln))
    #define ar_tpa(ap) \
            (ntohs((ap)->ar_hrd) == ARPHRD_IEEE1394 \
                    ? (((caddr_t)((ap)+1))+(ap)->ar_hln+(ap)->ar_pln) \
                    : (((caddr_t)((ap)+1))+(ap)->ar_hln+(ap)->ar_pln+(ap)->ar_hln))
    } __attribute__((__packed__));
    
    
    /*
     * 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 */
   
   /*
    * Kernel statistics about arp
    */
   struct arpstat {
           u_quad_t        as_sndtotal;    /* total packets sent */
           u_quad_t        as_sndreply;    /* replies sent */
           u_quad_t        as_sndrequest;  /* requests sent */
   
           u_quad_t        as_rcvtotal;    /* total packets received */
           u_quad_t        as_rcvrequest;  /* valid requests received */
           u_quad_t        as_rcvreply;    /* replies received */
           u_quad_t        as_rcvmcast;    /* multicast/broadcast received */
           u_quad_t        as_rcvbadproto; /* unknown protocol type received */
           u_quad_t        as_rcvbadlen;   /* bad (short) length received */
           u_quad_t        as_rcvzerotpa;  /* received w/ null target ip */
           u_quad_t        as_rcvzerospa;  /* received w/ null src ip */
           u_quad_t        as_rcvnoint;    /* couldn't map to interface */
           u_quad_t        as_rcvlocalsha; /* received from local hw address */
           u_quad_t        as_rcvbcastsha; /* received w/ broadcast src */
           u_quad_t        as_rcvlocalspa; /* received for a local ip [dup!] */
           u_quad_t        as_rcvoverperm; /* attempts to overwrite static info */
           u_quad_t        as_rcvoverint;  /* attempts to overwrite wrong if */
           u_quad_t        as_rcvover;     /* entries overwritten! */
           u_quad_t        as_rcvlenchg;   /* changes in hw add len */
   
           u_quad_t        as_dfrtotal;    /* deferred pending ARP resolution. */
           u_quad_t        as_dfrsent;     /* deferred, then sent */
           u_quad_t        as_dfrdropped;  /* deferred, then dropped */
   
           u_quad_t        as_allocfail;   /* Failures to allocate llinfo */
   };
   
   #endif /* !_NET_IF_ARP_H_ */

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