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: src/sys/net/if_arp.h,v 1.14.2.3 2002/02/20 23:34:09 fjoe Exp $
   35  * $DragonFly: src/sys/net/if_arp.h,v 1.9 2008/11/24 12:19:14 hasso Exp $
   36  */
   37 
   38 #ifndef _NET_IF_ARP_H_
   39 #define _NET_IF_ARP_H_
   40 
   41 #ifndef _SYS_TYPES_H_
   42 #include <sys/types.h>
   43 #endif
   44 #ifndef _SYS_SOCKET_H_
   45 #include <sys/socket.h>
   46 #endif
   47 
   48 /*
   49  * Address Resolution Protocol.
   50  *
   51  * See RFC 826 for protocol description.  ARP packets are variable
   52  * in size; the arphdr structure defines the fixed-length portion.
   53  * Protocol type values are the same as those for 10 Mb/s Ethernet.
   54  * It is followed by the variable-sized fields ar_sha, arp_spa,
   55  * arp_tha and arp_tpa in that order, according to the lengths
   56  * specified.  Field names used correspond to RFC 826.
   57  */
   58 struct  arphdr {
   59         u_short ar_hrd;         /* format of hardware address */
   60 #define ARPHRD_ETHER    1       /* ethernet hardware format */
   61 #define ARPHRD_IEEE802  6       /* token-ring hardware format */
   62 #define ARPHRD_ARCNET   7       /* arcnet hardware format */
   63 #define ARPHRD_FRELAY   15      /* frame relay hardware format */
   64 #define ARPHRD_IEEE1394 24      /* firewire hardware format */
   65         u_short ar_pro;         /* format of protocol address */
   66         u_char  ar_hln;         /* length of hardware address */
   67         u_char  ar_pln;         /* length of protocol address */
   68         u_short ar_op;          /* one of: */
   69 #define ARPOP_REQUEST   1       /* request to resolve address */
   70 #define ARPOP_REPLY     2       /* response to previous request */
   71 #define ARPOP_REVREQUEST 3      /* request protocol address given hardware */
   72 #define ARPOP_REVREPLY  4       /* response giving protocol address */
   73 #define ARPOP_INVREQUEST 8      /* request to identify peer */
   74 #define ARPOP_INVREPLY  9       /* response identifying peer */
   75 /*
   76  * The remaining fields are variable in size,
   77  * according to the sizes above.
   78  */
   79 #ifdef COMMENT_ONLY
   80         u_char  ar_sha[];       /* sender hardware address */
   81         u_char  ar_spa[];       /* sender protocol address */
   82         u_char  ar_tha[];       /* target hardware address */
   83         u_char  ar_tpa[];       /* target protocol address */
   84 #endif
   85 };
   86 
   87 #define ar_sha(ap)      (((caddr_t)((ap)+1)) +   0)
   88 #define ar_spa(ap)      (((caddr_t)((ap)+1)) +   (ap)->ar_hln)
   89 #define ar_tha(ap)      (((caddr_t)((ap)+1)) +   (ap)->ar_hln + (ap)->ar_pln)
   90 #define ar_tpa(ap)      (((caddr_t)((ap)+1)) + 2*(ap)->ar_hln + (ap)->ar_pln)
   91 
   92 #define arphdr_len2(ar_hln, ar_pln)                                     \
   93         (sizeof(struct arphdr) + 2*(ar_hln) + 2*(ar_pln))
   94 #define arphdr_len(ap)  (arphdr_len2((ap)->ar_hln, (ap)->ar_pln))
   95 
   96 /*
   97  * ARP ioctl request
   98  */
   99 struct arpreq {
  100         struct  sockaddr arp_pa;                /* protocol address */
  101         struct  sockaddr arp_ha;                /* hardware address */
  102         int     arp_flags;                      /* flags */
  103 };
  104 /*  arp_flags and at_flags field values */
  105 #define ATF_INUSE       0x01    /* entry in use */
  106 #define ATF_COM         0x02    /* completed entry (enaddr valid) */
  107 #define ATF_PERM        0x04    /* permanent entry */
  108 #define ATF_PUBL        0x08    /* publish entry (respond for other host) */
  109 #define ATF_USETRAILERS 0x10    /* has requested trailers */
  110 
  111 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  112 #ifndef _NET_IF_VAR_H_
  113 #include <net/if_var.h>
  114 #endif
  115 
  116 /*
  117  * Structure shared between the ethernet driver modules and
  118  * the address resolution code.  For example, each ec_softc or il_softc
  119  * begins with this structure.
  120  */
  121 struct  arpcom {
  122         /*
  123          * The ifnet struct _must_ be at the head of this structure.
  124          */
  125         struct  ifnet ac_if;            /* network-visible interface */
  126         u_char  ac_enaddr[6];           /* ethernet hardware address */
  127         int     ac_multicnt;            /* length of ac_multiaddrs list */
  128         void    *ac_netgraph;           /* ng_ether(4) netgraph node info */
  129 };
  130 
  131 #endif
  132 
  133 #endif /* !_NET_IF_ARP_H_ */

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