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Annotation of sys/net/if_arp.h, Revision 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_ */