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if_arp.h revision 1.7
      1  1.7      cgd /*	$NetBSD: if_arp.h,v 1.7 1994/06/29 06:36:07 cgd Exp $	*/
      2  1.7      cgd 
      3  1.1      cgd /*
      4  1.6  mycroft  * Copyright (c) 1986, 1993
      5  1.6  mycroft  *	The Regents of the University of California.  All rights reserved.
      6  1.1      cgd  *
      7  1.1      cgd  * Redistribution and use in source and binary forms, with or without
      8  1.1      cgd  * modification, are permitted provided that the following conditions
      9  1.1      cgd  * are met:
     10  1.1      cgd  * 1. Redistributions of source code must retain the above copyright
     11  1.1      cgd  *    notice, this list of conditions and the following disclaimer.
     12  1.1      cgd  * 2. Redistributions in binary form must reproduce the above copyright
     13  1.1      cgd  *    notice, this list of conditions and the following disclaimer in the
     14  1.1      cgd  *    documentation and/or other materials provided with the distribution.
     15  1.1      cgd  * 3. All advertising materials mentioning features or use of this software
     16  1.1      cgd  *    must display the following acknowledgement:
     17  1.1      cgd  *	This product includes software developed by the University of
     18  1.1      cgd  *	California, Berkeley and its contributors.
     19  1.1      cgd  * 4. Neither the name of the University nor the names of its contributors
     20  1.1      cgd  *    may be used to endorse or promote products derived from this software
     21  1.1      cgd  *    without specific prior written permission.
     22  1.1      cgd  *
     23  1.1      cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  1.1      cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  1.1      cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  1.1      cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  1.1      cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  1.1      cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  1.1      cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  1.1      cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  1.1      cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  1.1      cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  1.1      cgd  * SUCH DAMAGE.
     34  1.1      cgd  *
     35  1.7      cgd  *	@(#)if_arp.h	8.1 (Berkeley) 6/10/93
     36  1.1      cgd  */
     37  1.1      cgd 
     38  1.1      cgd /*
     39  1.1      cgd  * Address Resolution Protocol.
     40  1.1      cgd  *
     41  1.1      cgd  * See RFC 826 for protocol description.  ARP packets are variable
     42  1.1      cgd  * in size; the arphdr structure defines the fixed-length portion.
     43  1.1      cgd  * Protocol type values are the same as those for 10 Mb/s Ethernet.
     44  1.1      cgd  * It is followed by the variable-sized fields ar_sha, arp_spa,
     45  1.1      cgd  * arp_tha and arp_tpa in that order, according to the lengths
     46  1.1      cgd  * specified.  Field names used correspond to RFC 826.
     47  1.1      cgd  */
     48  1.1      cgd struct	arphdr {
     49  1.1      cgd 	u_short	ar_hrd;		/* format of hardware address */
     50  1.6  mycroft #define ARPHRD_ETHER 	1	/* ethernet hardware format */
     51  1.6  mycroft #define ARPHRD_FRELAY 	15	/* frame relay hardware format */
     52  1.1      cgd 	u_short	ar_pro;		/* format of protocol address */
     53  1.1      cgd 	u_char	ar_hln;		/* length of hardware address */
     54  1.1      cgd 	u_char	ar_pln;		/* length of protocol address */
     55  1.1      cgd 	u_short	ar_op;		/* one of: */
     56  1.1      cgd #define	ARPOP_REQUEST	1	/* request to resolve address */
     57  1.1      cgd #define	ARPOP_REPLY	2	/* response to previous request */
     58  1.6  mycroft #define	ARPOP_REVREQUEST 3	/* request protocol address given hardware */
     59  1.6  mycroft #define	ARPOP_REVREPLY	4	/* response giving protocol address */
     60  1.6  mycroft #define	ARPOP_INVREQUEST 8 	/* request to identify peer */
     61  1.6  mycroft #define	ARPOP_INVREPLY	9	/* response identifying peer */
     62  1.1      cgd /*
     63  1.1      cgd  * The remaining fields are variable in size,
     64  1.1      cgd  * according to the sizes above.
     65  1.1      cgd  */
     66  1.6  mycroft #ifdef COMMENT_ONLY
     67  1.6  mycroft 	u_char	ar_sha[];	/* sender hardware address */
     68  1.6  mycroft 	u_char	ar_spa[];	/* sender protocol address */
     69  1.6  mycroft 	u_char	ar_tha[];	/* target hardware address */
     70  1.6  mycroft 	u_char	ar_tpa[];	/* target protocol address */
     71  1.6  mycroft #endif
     72  1.1      cgd };
     73  1.1      cgd 
     74  1.1      cgd /*
     75  1.1      cgd  * ARP ioctl request
     76  1.1      cgd  */
     77  1.1      cgd struct arpreq {
     78  1.1      cgd 	struct	sockaddr arp_pa;		/* protocol address */
     79  1.1      cgd 	struct	sockaddr arp_ha;		/* hardware address */
     80  1.1      cgd 	int	arp_flags;			/* flags */
     81  1.1      cgd };
     82  1.1      cgd /*  arp_flags and at_flags field values */
     83  1.1      cgd #define	ATF_INUSE	0x01	/* entry in use */
     84  1.1      cgd #define ATF_COM		0x02	/* completed entry (enaddr valid) */
     85  1.1      cgd #define	ATF_PERM	0x04	/* permanent entry */
     86  1.1      cgd #define	ATF_PUBL	0x08	/* publish entry (respond for other host) */
     87  1.1      cgd #define	ATF_USETRAILERS	0x10	/* has requested trailers */
     88