sys/net/if_arp.h

   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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)if_arp.h    8.1 (Berkeley) 6/10/93
  30  * $FreeBSD: src/sys/net/if_arp.h,v 1.14.2.3 2002/02/20 23:34:09 fjoe Exp $
  31  * $DragonFly: src/sys/net/if_arp.h,v 1.9 2008/11/24 12:19:14 hasso Exp $
  32  */
  33
  34 #ifndef _NET_IF_ARP_H_
  35 #define _NET_IF_ARP_H_
  36
  37 #ifndef _SYS_TYPES_H_
  38 #include <sys/types.h>
  39 #endif
  40 #ifndef _SYS_SOCKET_H_
  41 #include <sys/socket.h>
  42 #endif
  43
  44 /*
  45  * Address Resolution Protocol.
  46  *
  47  * See RFC 826 for protocol description.  ARP packets are variable
  48  * in size; the arphdr structure defines the fixed-length portion.
  49  * Protocol type values are the same as those for 10 Mb/s Ethernet.
  50  * It is followed by the variable-sized fields ar_sha, arp_spa,
  51  * arp_tha and arp_tpa in that order, according to the lengths
  52  * specified.  Field names used correspond to RFC 826.
  53  */
  54 struct  arphdr {
  55         u_short ar_hrd;         /* format of hardware address */
  56 #define ARPHRD_ETHER    1       /* ethernet hardware format */
  57 #define ARPHRD_IEEE802  6       /* token-ring hardware format */
  58 #define ARPHRD_ARCNET   7       /* arcnet hardware format */
  59 #define ARPHRD_FRELAY   15      /* frame relay hardware format */
  60 #define ARPHRD_IEEE1394 24      /* firewire hardware format */
  61         u_short ar_pro;         /* format of protocol address */
  62         u_char  ar_hln;         /* length of hardware address */
  63         u_char  ar_pln;         /* length of protocol address */
  64         u_short ar_op;          /* one of: */
  65 #define ARPOP_REQUEST   1       /* request to resolve address */
  66 #define ARPOP_REPLY     2       /* response to previous request */
  67 #define ARPOP_REVREQUEST 3      /* request protocol address given hardware */
  68 #define ARPOP_REVREPLY  4       /* response giving protocol address */
  69 #define ARPOP_INVREQUEST 8      /* request to identify peer */
  70 #define ARPOP_INVREPLY  9       /* response identifying peer */
  71 /*
  72  * The remaining fields are variable in size,
  73  * according to the sizes above.
  74  */
  75 #ifdef COMMENT_ONLY
  76         u_char  ar_sha[];       /* sender hardware address */
  77         u_char  ar_spa[];       /* sender protocol address */
  78         u_char  ar_tha[];       /* target hardware address */
  79         u_char  ar_tpa[];       /* target protocol address */
  80 #endif
  81 };
  82
  83 #define ar_sha(ap)      (((caddr_t)((ap)+1)) +   0)
  84 #define ar_spa(ap)      (((caddr_t)((ap)+1)) +   (ap)->ar_hln)
  85 #define ar_tha(ap)      (((caddr_t)((ap)+1)) +   (ap)->ar_hln + (ap)->ar_pln)
  86 #define ar_tpa(ap)      (((caddr_t)((ap)+1)) + 2*(ap)->ar_hln + (ap)->ar_pln)
  87
  88 #define arphdr_len2(ar_hln, ar_pln)                                     \
  89         (sizeof(struct arphdr) + 2*(ar_hln) + 2*(ar_pln))
  90 #define arphdr_len(ap)  (arphdr_len2((ap)->ar_hln, (ap)->ar_pln))
  91
  92 /*
  93  * ARP ioctl request
  94  */
  95 struct arpreq {
  96         struct  sockaddr arp_pa;                /* protocol address */
  97         struct  sockaddr arp_ha;                /* hardware address */
  98         int     arp_flags;                      /* flags */
  99 };
 100 /*  arp_flags and at_flags field values */
 101 #define ATF_INUSE       0x01    /* entry in use */
 102 #define ATF_COM         0x02    /* completed entry (enaddr valid) */
 103 #define ATF_PERM        0x04    /* permanent entry */
 104 #define ATF_PUBL        0x08    /* publish entry (respond for other host) */
 105 #define ATF_USETRAILERS 0x10    /* has requested trailers */
 106
 107 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
 108 #ifndef _NET_IF_VAR_H_
 109 #include <net/if_var.h>
 110 #endif
 111
 112 /*
 113  * Structure shared between the ethernet driver modules and
 114  * the address resolution code.  For example, each ec_softc or il_softc
 115  * begins with this structure.
 116  */
 117 struct  arpcom {
 118         /*
 119          * The ifnet struct _must_ be at the head of this structure.
 120          */
 121         struct  ifnet ac_if;            /* network-visible interface */
 122         u_char  ac_enaddr[6];           /* ethernet hardware address */
 123         int     ac_multicnt;            /* length of ac_multiaddrs list */
 124         void    *ac_netgraph;           /* ng_ether(4) netgraph node info */
 125 };
 126
 127 #endif
 128
 129 #endif /* !_NET_IF_ARP_H_ */