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Annotation of 43BSD/sys/net/if_arp.h, revision 1.1.1.1

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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