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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  * 4. 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  * $FreeBSD$
   31  */
   32 
   33 #ifndef _NET_IF_ARP_H_
   34 #define _NET_IF_ARP_H_
   35 
   36 /*
   37  * Address Resolution Protocol.
   38  *
   39  * See RFC 826 for protocol description.  ARP packets are variable
   40  * in size; the arphdr structure defines the fixed-length portion.
   41  * Protocol type values are the same as those for 10 Mb/s Ethernet.
   42  * It is followed by the variable-sized fields ar_sha, arp_spa,
   43  * arp_tha and arp_tpa in that order, according to the lengths
   44  * specified.  Field names used correspond to RFC 826.
   45  */
   46 struct  arphdr {
   47         u_short ar_hrd;         /* format of hardware address */
   48 #define ARPHRD_ETHER    1       /* ethernet hardware format */
   49 #define ARPHRD_IEEE802  6       /* token-ring hardware format */
   50 #define ARPHRD_ARCNET   7       /* arcnet hardware format */
   51 #define ARPHRD_FRELAY   15      /* frame relay hardware format */
   52 #define ARPHRD_IEEE1394 24      /* firewire hardware format */
   53         u_short ar_pro;         /* format of protocol address */
   54         u_char  ar_hln;         /* length of hardware address */
   55         u_char  ar_pln;         /* length of protocol address */
   56         u_short ar_op;          /* one of: */
   57 #define ARPOP_REQUEST   1       /* request to resolve address */
   58 #define ARPOP_REPLY     2       /* response to previous request */
   59 #define ARPOP_REVREQUEST 3      /* request protocol address given hardware */
   60 #define ARPOP_REVREPLY  4       /* response giving protocol address */
   61 #define ARPOP_INVREQUEST 8      /* request to identify peer */
   62 #define ARPOP_INVREPLY  9       /* response identifying peer */
   63 /*
   64  * The remaining fields are variable in size,
   65  * according to the sizes above.
   66  */
   67 #ifdef COMMENT_ONLY
   68         u_char  ar_sha[];       /* sender hardware address */
   69         u_char  ar_spa[];       /* sender protocol address */
   70         u_char  ar_tha[];       /* target hardware address */
   71         u_char  ar_tpa[];       /* target protocol address */
   72 #endif
   73 };
   74 
   75 #define ar_sha(ap)      (((caddr_t)((ap)+1)) +   0)
   76 #define ar_spa(ap)      (((caddr_t)((ap)+1)) +   (ap)->ar_hln)
   77 #define ar_tha(ap)      (((caddr_t)((ap)+1)) +   (ap)->ar_hln + (ap)->ar_pln)
   78 #define ar_tpa(ap)      (((caddr_t)((ap)+1)) + 2*(ap)->ar_hln + (ap)->ar_pln)
   79 
   80 #define arphdr_len2(ar_hln, ar_pln)                                     \
   81         (sizeof(struct arphdr) + 2*(ar_hln) + 2*(ar_pln))
   82 #define arphdr_len(ap)  (arphdr_len2((ap)->ar_hln, (ap)->ar_pln))
   83 
   84 /*
   85  * ARP ioctl request
   86  */
   87 struct arpreq {
   88         struct  sockaddr arp_pa;                /* protocol address */
   89         struct  sockaddr arp_ha;                /* hardware address */
   90         int     arp_flags;                      /* flags */
   91 };
   92 /*  arp_flags and at_flags field values */
   93 #define ATF_INUSE       0x01    /* entry in use */
   94 #define ATF_COM         0x02    /* completed entry (enaddr valid) */
   95 #define ATF_PERM        0x04    /* permanent entry */
   96 #define ATF_PUBL        0x08    /* publish entry (respond for other host) */
   97 #define ATF_USETRAILERS 0x10    /* has requested trailers */
   98 
   99 #ifdef _KERNEL
  100 /*
  101  * Structure shared between the ethernet driver modules and
  102  * the address resolution code.
  103  */
  104 struct  arpcom {
  105         struct  ifnet *ac_ifp;          /* network-visible interface */
  106         void    *ac_netgraph;           /* ng_ether(4) netgraph node info */
  107 };
  108 #define IFP2AC(ifp) ((struct arpcom *)(ifp->if_l2com))
  109 #define AC2IFP(ac) ((ac)->ac_ifp)
  110 
  111 #endif
  112 
  113 #endif /* !_NET_IF_ARP_H_ */

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