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Annotation of sys/net/if_arp.h, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: if_arp.h,v 1.6 2003/06/02 23:28:12 millert Exp $      */
                      2: /*     $NetBSD: if_arp.h,v 1.8 1995/03/08 02:56:52 cgd Exp $   */
                      3:
                      4: /*
                      5:  * Copyright (c) 1986, 1993
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. Neither the name of the University nor the names of its contributors
                     17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
                     19:  *
                     20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  *
                     32:  *     @(#)if_arp.h    8.1 (Berkeley) 6/10/93
                     33:  */
                     34:
                     35: #ifndef _NET_IF_ARP_H_
                     36: #define _NET_IF_ARP_H_
                     37: /*
                     38:  * Address Resolution Protocol.
                     39:  *
                     40:  * See RFC 826 for protocol description.  ARP packets are variable
                     41:  * in size; the arphdr structure defines the fixed-length portion.
                     42:  * Protocol type values are the same as those for 10 Mb/s Ethernet.
                     43:  * It is followed by the variable-sized fields ar_sha, arp_spa,
                     44:  * arp_tha and arp_tpa in that order, according to the lengths
                     45:  * specified.  Field names used correspond to RFC 826.
                     46:  */
                     47: struct arphdr {
                     48:        u_int16_t ar_hrd;       /* format of hardware address */
                     49: #define ARPHRD_ETHER   1       /* ethernet hardware format */
                     50: #define ARPHRD_IEEE802         6       /* IEEE 802 hardware format */
                     51: #define ARPHRD_FRELAY  15      /* frame relay hardware format */
                     52: #define ARPHRD_IEEE1394        24      /* IEEE 1394 (FireWire) hardware format */
                     53:        u_int16_t ar_pro;       /* format of protocol address */
                     54:        u_int8_t  ar_hln;       /* length of hardware address */
                     55:        u_int8_t  ar_pln;       /* length of protocol address */
                     56:        u_int16_t 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_int8_t  ar_sha[];     /* sender hardware address */
                     69:        u_int8_t  ar_spa[];     /* sender protocol address */
                     70:        u_int8_t  ar_tha[];     /* target hardware address */
                     71:        u_int8_t  ar_tpa[];     /* target protocol address */
                     72: #endif
                     73: };
                     74:
                     75: /*
                     76:  * ARP ioctl request
                     77:  */
                     78: struct arpreq {
                     79:        struct  sockaddr arp_pa;                /* protocol address */
                     80:        struct  sockaddr arp_ha;                /* hardware address */
                     81:        int     arp_flags;                      /* flags */
                     82: };
                     83: /*  arp_flags and at_flags field values */
                     84: #define        ATF_INUSE       0x01    /* entry in use */
                     85: #define ATF_COM                0x02    /* completed entry (enaddr valid) */
                     86: #define        ATF_PERM        0x04    /* permanent entry */
                     87: #define        ATF_PUBL        0x08    /* publish entry (respond for other host) */
                     88: #define        ATF_USETRAILERS 0x10    /* has requested trailers */
                     89: #endif /* _NET_IF_ARP_H_ */