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if_arp.h revision 1.9 
      1 /*	$NetBSD: if_arp.h,v 1.9 1997/03/15 18:12:23 is Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1986, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  *
     35  *	@(#)if_arp.h	8.1 (Berkeley) 6/10/93
     36  */
     37 
     38 #ifndef _IF_ARP_H_
     39 #define _IF_ARP_H_
     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_int16_t ar_hrd;	/* format of hardware address */
     52 #define ARPHRD_ETHER 	1	/* ethernet hardware format */
     53 #define ARPHRD_FRELAY 	15	/* frame relay hardware format */
     54 	u_int16_t ar_pro;	/* format of protocol address */
     55 	u_int8_t  ar_hln;	/* length of hardware address */
     56 	u_int8_t  ar_pln;	/* length of protocol address */
     57 	u_int16_t ar_op;	/* one of: */
     58 #define	ARPOP_REQUEST	1	/* request to resolve address */
     59 #define	ARPOP_REPLY	2	/* response to previous request */
     60 #define	ARPOP_REVREQUEST 3	/* request protocol address given hardware */
     61 #define	ARPOP_REVREPLY	4	/* response giving protocol address */
     62 #define	ARPOP_INVREQUEST 8 	/* request to identify peer */
     63 #define	ARPOP_INVREPLY	9	/* response identifying peer */
     64 /*
     65  * The remaining fields are variable in size,
     66  * according to the sizes above.
     67  */
     68 #ifdef COMMENT_ONLY
     69 	u_int8_t  ar_sha[];	/* sender hardware address */
     70 	u_int8_t  ar_spa[];	/* sender protocol address */
     71 	u_int8_t  ar_tha[];	/* target hardware address */
     72 	u_int8_t  ar_tpa[];	/* target protocol address */
     73 #endif
     74 	u_int8_t  ar_remain[0];	/* minimum size, normally bigger */
     75 #define ar_sha(ap) (((ap)->ar_remain)+0)
     76 #define ar_spa(ap) (((ap)->ar_remain)+(ap)->ar_hln)
     77 #define ar_tha(ap) (((ap)->ar_remain)+(ap)->ar_hln+(ap)->ar_pln)
     78 #define ar_tpa(ap) (((ap)->ar_remain)+2*(ap)->ar_hln+(ap)->ar_pln)
     79 };
     80 
     81 
     82 /*
     83  * ARP ioctl request
     84  */
     85 struct arpreq {
     86 	struct	sockaddr arp_pa;		/* protocol address */
     87 	struct	sockaddr arp_ha;		/* hardware address */
     88 	int	arp_flags;			/* flags */
     89 };
     90 /*  arp_flags and at_flags field values */
     91 #define	ATF_INUSE	0x01	/* entry in use */
     92 #define ATF_COM		0x02	/* completed entry (enaddr valid) */
     93 #define	ATF_PERM	0x04	/* permanent entry */
     94 #define	ATF_PUBL	0x08	/* publish entry (respond for other host) */
     95 #define	ATF_USETRAILERS	0x10	/* has requested trailers */
     96 
     97 #endif _IF_ARP_H_
     98