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if_arp.h revision 1.1 
      1 /*
      2  * Copyright (c) 1986 Regents of the University of California.
      3  * 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	7.4 (Berkeley) 6/28/90
     34  */
     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 address */
     49 	u_short	ar_pro;		/* format of protocol address */
     50 	u_char	ar_hln;		/* length of hardware address */
     51 	u_char	ar_pln;		/* length of protocol address */
     52 	u_short	ar_op;		/* one of: */
     53 #define	ARPOP_REQUEST	1	/* request to resolve address */
     54 #define	ARPOP_REPLY	2	/* response to previous request */
     55 /*
     56  * The remaining fields are variable in size,
     57  * according to the sizes above.
     58  */
     59 /*	u_char	ar_sha[];	/* sender hardware address */
     60 /*	u_char	ar_spa[];	/* sender protocol address */
     61 /*	u_char	ar_tha[];	/* target hardware address */
     62 /*	u_char	ar_tpa[];	/* target protocol address */
     63 };
     64 
     65 /*
     66  * ARP ioctl request
     67  */
     68 struct arpreq {
     69 	struct	sockaddr arp_pa;		/* protocol address */
     70 	struct	sockaddr arp_ha;		/* hardware address */
     71 	int	arp_flags;			/* flags */
     72 };
     73 /*  arp_flags and at_flags field values */
     74 #define	ATF_INUSE	0x01	/* entry in use */
     75 #define ATF_COM		0x02	/* completed entry (enaddr valid) */
     76 #define	ATF_PERM	0x04	/* permanent entry */
     77 #define	ATF_PUBL	0x08	/* publish entry (respond for other host) */
     78 #define	ATF_USETRAILERS	0x10	/* has requested trailers */
     79