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

     /*      $NetBSD: if_arp.h,v 1.43 2021/02/19 14:51:59 christos 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 {
            uint16_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 */
            uint16_t ar_pro;           /* format of protocol address */
            uint8_t  ar_hln;           /* length of hardware address */
            uint8_t  ar_pln;           /* length of protocol address */
            uint16_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
            uint8_t  ar_sha[];      /* sender hardware address */
            uint8_t  ar_spa[];      /* sender protocol address */
            uint8_t  ar_tha[];      /* target hardware address (!IEEE1394) */
            uint8_t  ar_tpa[];      /* target protocol address */
    #endif
    };
    
    static __inline uint8_t *
    ar_data(struct arphdr *ap)
    {
            return (uint8_t *)(void *)(ap + 1);
    }
    
    static __inline uint8_t *
    ar_sha(struct arphdr *ap)
    {
            return ar_data(ap) + 0;
    }
    
    static __inline uint8_t *
    ar_spa(struct arphdr *ap)
    {
            return ar_data(ap) + ap->ar_hln;
    }
    
    static __inline uint8_t *
    ar_tha(struct arphdr *ap)
    {
            if (ntohs(ap->ar_hrd) == ARPHRD_IEEE1394) {
                    return NULL;
            } else {
                   return ar_data(ap) + ap->ar_hln + ap->ar_pln;
           }
   }
   
   static __inline uint8_t *
   ar_tpa(struct arphdr *ap)
   {
           if (ntohs(ap->ar_hrd) == ARPHRD_IEEE1394) {
                   return ar_data(ap) + ap->ar_hln + ap->ar_pln;
           } else {
                   return ar_data(ap) + ap->ar_hln + ap->ar_pln + ap->ar_hln;
           }
   }
   
   /*
    * 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
    */
   #define ARP_STAT_SNDTOTAL       0       /* total packets sent */
   #define ARP_STAT_SNDREPLY       1       /* replies sent */
   #define ARP_STAT_SENDREQUEST    2       /* requests sent */
   #define ARP_STAT_RCVTOTAL       3       /* total packets received */
   #define ARP_STAT_RCVREQUEST     4       /* valid requests received */
   #define ARP_STAT_RCVREPLY       5       /* replies received */
   #define ARP_STAT_RCVMCAST       6       /* multicast/broadcast received */
   #define ARP_STAT_RCVBADPROTO    7       /* unknown protocol type received */
   #define ARP_STAT_RCVBADLEN      8       /* bad (short) length received */
   #define ARP_STAT_RCVZEROTPA     9       /* received w/ null target ip */
   #define ARP_STAT_RCVZEROSPA     10      /* received w/ null source ip */
   #define ARP_STAT_RCVNOINT       11      /* couldn't map to interface */
   #define ARP_STAT_RCVLOCALSHA    12      /* received from local hw address */
   #define ARP_STAT_RCVBCASTSHA    13      /* received w/ broadcast src */
   #define ARP_STAT_RCVLOCALSPA    14      /* received for a local ip [dup!] */
   #define ARP_STAT_RCVOVERPERM    15      /* attempts to overwrite static info */
   #define ARP_STAT_RCVOVERINT     16      /* attempts to overwrite wrong if */
   #define ARP_STAT_RCVOVER        17      /* entries overwritten! */
   #define ARP_STAT_RCVLENCHG      18      /* changes in hw address len */
   #define ARP_STAT_DFRTOTAL       19      /* deferred pending ARP resolution */
   #define ARP_STAT_DFRSENT        20      /* deferred, then sent */
   #define ARP_STAT_DFRDROPPED     21      /* deferred, then dropped */
   #define ARP_STAT_ALLOCFAIL      22      /* failures to allocate llinfo */
   
   #define ARP_NSTATS              23
   
   void arp_stat_add(int, uint64_t);
   
   #endif /* !_NET_IF_ARP_H_ */

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