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Annotation of 43BSD/sys/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.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)if_arp.h    7.1 (Berkeley) 6/4/86
        !             7:  */
        !             8: 
        !             9: /*
        !            10:  * Address Resolution Protocol.
        !            11:  *
        !            12:  * See RFC 826 for protocol description.  ARP packets are variable
        !            13:  * in size; the arphdr structure defines the fixed-length portion.
        !            14:  * Protocol type values are the same as those for 10 Mb/s Ethernet.
        !            15:  * It is followed by the variable-sized fields ar_sha, arp_spa,
        !            16:  * arp_tha and arp_tpa in that order, according to the lengths
        !            17:  * specified.  Field names used correspond to RFC 826.
        !            18:  */
        !            19: struct arphdr {
        !            20:        u_short ar_hrd;         /* format of hardware address */
        !            21: #define ARPHRD_ETHER   1       /* ethernet hardware address */
        !            22:        u_short ar_pro;         /* format of protocol address */
        !            23:        u_char  ar_hln;         /* length of hardware address */
        !            24:        u_char  ar_pln;         /* length of protocol address */
        !            25:        u_short ar_op;          /* one of: */
        !            26: #define        ARPOP_REQUEST   1       /* request to resolve address */
        !            27: #define        ARPOP_REPLY     2       /* response to previous request */
        !            28: /*
        !            29:  * The remaining fields are variable in size,
        !            30:  * according to the sizes above.
        !            31:  */
        !            32: /*     u_char  ar_sha[];       /* sender hardware address */
        !            33: /*     u_char  ar_spa[];       /* sender protocol address */
        !            34: /*     u_char  ar_tha[];       /* target hardware address */
        !            35: /*     u_char  ar_tpa[];       /* target protocol address */
        !            36: };
        !            37: 
        !            38: /*
        !            39:  * ARP ioctl request
        !            40:  */
        !            41: struct arpreq {
        !            42:        struct  sockaddr arp_pa;                /* protocol address */
        !            43:        struct  sockaddr arp_ha;                /* hardware address */
        !            44:        int     arp_flags;                      /* flags */
        !            45: };
        !            46: /*  arp_flags and at_flags field values */
        !            47: #define        ATF_INUSE       0x01    /* entry in use */
        !            48: #define ATF_COM                0x02    /* completed entry (enaddr valid) */
        !            49: #define        ATF_PERM        0x04    /* permanent entry */
        !            50: #define        ATF_PUBL        0x08    /* publish entry (respond for other host) */
        !            51: #define        ATF_USETRAILERS 0x10    /* has requested trailers */

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