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Annotation of Net2/net/if_arp.h, revision 1.1

1.1     ! root        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 */

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