The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*
    2  * Copyright (c) 1986, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)if_arp.h    8.1 (Berkeley) 6/10/93
   34  * $FreeBSD: releng/5.2/sys/net/if_arp.h 112469 2003-03-21 17:53:16Z mdodd $
   35  */
   36 
   37 #ifndef _NET_IF_ARP_H_
   38 #define _NET_IF_ARP_H_
   39 
   40 /*
   41  * Address Resolution Protocol.
   42  *
   43  * See RFC 826 for protocol description.  ARP packets are variable
   44  * in size; the arphdr structure defines the fixed-length portion.
   45  * Protocol type values are the same as those for 10 Mb/s Ethernet.
   46  * It is followed by the variable-sized fields ar_sha, arp_spa,
   47  * arp_tha and arp_tpa in that order, according to the lengths
   48  * specified.  Field names used correspond to RFC 826.
   49  */
   50 struct  arphdr {
   51         u_short ar_hrd;         /* format of hardware address */
   52 #define ARPHRD_ETHER    1       /* ethernet hardware format */
   53 #define ARPHRD_IEEE802  6       /* token-ring hardware format */
   54 #define ARPHRD_ARCNET   7       /* arcnet hardware format */
   55 #define ARPHRD_FRELAY   15      /* frame relay hardware format */
   56         u_short ar_pro;         /* format of protocol address */
   57         u_char  ar_hln;         /* length of hardware address */
   58         u_char  ar_pln;         /* length of protocol address */
   59         u_short ar_op;          /* one of: */
   60 #define ARPOP_REQUEST   1       /* request to resolve address */
   61 #define ARPOP_REPLY     2       /* response to previous request */
   62 #define ARPOP_REVREQUEST 3      /* request protocol address given hardware */
   63 #define ARPOP_REVREPLY  4       /* response giving protocol address */
   64 #define ARPOP_INVREQUEST 8      /* request to identify peer */
   65 #define ARPOP_INVREPLY  9       /* response identifying peer */
   66 /*
   67  * The remaining fields are variable in size,
   68  * according to the sizes above.
   69  */
   70 #ifdef COMMENT_ONLY
   71         u_char  ar_sha[];       /* sender hardware address */
   72         u_char  ar_spa[];       /* sender protocol address */
   73         u_char  ar_tha[];       /* target hardware address */
   74         u_char  ar_tpa[];       /* target protocol address */
   75 #endif
   76 };
   77 
   78 #define ar_sha(ap)      (((caddr_t)((ap)+1)) +   0)
   79 #define ar_spa(ap)      (((caddr_t)((ap)+1)) +   (ap)->ar_hln)
   80 #define ar_tha(ap)      (((caddr_t)((ap)+1)) +   (ap)->ar_hln + (ap)->ar_pln)
   81 #define ar_tpa(ap)      (((caddr_t)((ap)+1)) + 2*(ap)->ar_hln + (ap)->ar_pln)
   82 
   83 #define arphdr_len2(ar_hln, ar_pln)                                     \
   84         (sizeof(struct arphdr) + 2*(ar_hln) + 2*(ar_pln))
   85 #define arphdr_len(ap)  (arphdr_len2((ap)->ar_hln, (ap)->ar_pln))
   86 
   87 /*
   88  * ARP ioctl request
   89  */
   90 struct arpreq {
   91         struct  sockaddr arp_pa;                /* protocol address */
   92         struct  sockaddr arp_ha;                /* hardware address */
   93         int     arp_flags;                      /* flags */
   94 };
   95 /*  arp_flags and at_flags field values */
   96 #define ATF_INUSE       0x01    /* entry in use */
   97 #define ATF_COM         0x02    /* completed entry (enaddr valid) */
   98 #define ATF_PERM        0x04    /* permanent entry */
   99 #define ATF_PUBL        0x08    /* publish entry (respond for other host) */
  100 #define ATF_USETRAILERS 0x10    /* has requested trailers */
  101 
  102 #ifdef _KERNEL
  103 /*
  104  * Structure shared between the ethernet driver modules and
  105  * the address resolution code.  For example, each ec_softc or il_softc
  106  * begins with this structure.
  107  */
  108 struct  arpcom {
  109         /*
  110          * The ifnet struct _must_ be at the head of this structure.
  111          */
  112         struct  ifnet ac_if;            /* network-visible interface */
  113         u_char  ac_enaddr[6];           /* ethernet hardware address */
  114         int     ac_multicnt;            /* length of ac_multiaddrs list */
  115         void    *ac_netgraph;           /* ng_ether(4) netgraph node info */
  116 };
  117 #endif
  118 
  119 #endif /* !_NET_IF_ARP_H_ */

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