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Annotation of 43BSDTahoe/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.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that the above copyright notice and this paragraph are
                      7:  * duplicated in all such forms and that any documentation,
                      8:  * advertising materials, and other materials related to such
                      9:  * distribution and use acknowledge that the software was developed
                     10:  * by the University of California, Berkeley.  The name of the
                     11:  * University may not be used to endorse or promote products derived
                     12:  * from this software without specific prior written permission.
                     13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     16:  *
                     17:  *     @(#)if_arp.h    7.3 (Berkeley) 6/27/88
                     18:  */
                     19: 
                     20: /*
                     21:  * Address Resolution Protocol.
                     22:  *
                     23:  * See RFC 826 for protocol description.  ARP packets are variable
                     24:  * in size; the arphdr structure defines the fixed-length portion.
                     25:  * Protocol type values are the same as those for 10 Mb/s Ethernet.
                     26:  * It is followed by the variable-sized fields ar_sha, arp_spa,
                     27:  * arp_tha and arp_tpa in that order, according to the lengths
                     28:  * specified.  Field names used correspond to RFC 826.
                     29:  */
                     30: struct arphdr {
                     31:        u_short ar_hrd;         /* format of hardware address */
                     32: #define ARPHRD_ETHER   1       /* ethernet hardware address */
                     33:        u_short ar_pro;         /* format of protocol address */
                     34:        u_char  ar_hln;         /* length of hardware address */
                     35:        u_char  ar_pln;         /* length of protocol address */
                     36:        u_short ar_op;          /* one of: */
                     37: #define        ARPOP_REQUEST   1       /* request to resolve address */
                     38: #define        ARPOP_REPLY     2       /* response to previous request */
                     39: /*
                     40:  * The remaining fields are variable in size,
                     41:  * according to the sizes above.
                     42:  */
                     43: /*     u_char  ar_sha[];       /* sender hardware address */
                     44: /*     u_char  ar_spa[];       /* sender protocol address */
                     45: /*     u_char  ar_tha[];       /* target hardware address */
                     46: /*     u_char  ar_tpa[];       /* target protocol address */
                     47: };
                     48: 
                     49: /*
                     50:  * ARP ioctl request
                     51:  */
                     52: struct arpreq {
                     53:        struct  sockaddr arp_pa;                /* protocol address */
                     54:        struct  sockaddr arp_ha;                /* hardware address */
                     55:        int     arp_flags;                      /* flags */
                     56: };
                     57: /*  arp_flags and at_flags field values */
                     58: #define        ATF_INUSE       0x01    /* entry in use */
                     59: #define ATF_COM                0x02    /* completed entry (enaddr valid) */
                     60: #define        ATF_PERM        0x04    /* permanent entry */
                     61: #define        ATF_PUBL        0x08    /* publish entry (respond for other host) */
                     62: #define        ATF_USETRAILERS 0x10    /* has requested trailers */

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