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Annotation of 43BSDReno/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 is only permitted until one year after the first shipment
                      6:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
                      7:  * binary forms are permitted provided that: (1) source distributions retain
                      8:  * this entire copyright notice and comment, and (2) distributions including
                      9:  * binaries display the following acknowledgement:  This product includes
                     10:  * software developed by the University of California, Berkeley and its
                     11:  * contributors'' in the documentation or other materials provided with the
                     12:  * distribution and in all advertising materials mentioning features or use
                     13:  * of this software.  Neither the name of the University nor the names of
                     14:  * its contributors may be used to endorse or promote products derived from
                     15:  * this software without specific prior written permission.
                     16:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
                     17:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
                     18:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     19:  *
                     20:  *     @(#)if_arp.h    7.4 (Berkeley) 6/28/90
                     21:  */
                     22: 
                     23: /*
                     24:  * Address Resolution Protocol.
                     25:  *
                     26:  * See RFC 826 for protocol description.  ARP packets are variable
                     27:  * in size; the arphdr structure defines the fixed-length portion.
                     28:  * Protocol type values are the same as those for 10 Mb/s Ethernet.
                     29:  * It is followed by the variable-sized fields ar_sha, arp_spa,
                     30:  * arp_tha and arp_tpa in that order, according to the lengths
                     31:  * specified.  Field names used correspond to RFC 826.
                     32:  */
                     33: struct arphdr {
                     34:        u_short ar_hrd;         /* format of hardware address */
                     35: #define ARPHRD_ETHER   1       /* ethernet hardware address */
                     36:        u_short ar_pro;         /* format of protocol address */
                     37:        u_char  ar_hln;         /* length of hardware address */
                     38:        u_char  ar_pln;         /* length of protocol address */
                     39:        u_short ar_op;          /* one of: */
                     40: #define        ARPOP_REQUEST   1       /* request to resolve address */
                     41: #define        ARPOP_REPLY     2       /* response to previous request */
                     42: /*
                     43:  * The remaining fields are variable in size,
                     44:  * according to the sizes above.
                     45:  */
                     46: /*     u_char  ar_sha[];       /* sender hardware address */
                     47: /*     u_char  ar_spa[];       /* sender protocol address */
                     48: /*     u_char  ar_tha[];       /* target hardware address */
                     49: /*     u_char  ar_tpa[];       /* target protocol address */
                     50: };
                     51: 
                     52: /*
                     53:  * ARP ioctl request
                     54:  */
                     55: struct arpreq {
                     56:        struct  sockaddr arp_pa;                /* protocol address */
                     57:        struct  sockaddr arp_ha;                /* hardware address */
                     58:        int     arp_flags;                      /* flags */
                     59: };
                     60: /*  arp_flags and at_flags field values */
                     61: #define        ATF_INUSE       0x01    /* entry in use */
                     62: #define ATF_COM                0x02    /* completed entry (enaddr valid) */
                     63: #define        ATF_PERM        0x04    /* permanent entry */
                     64: #define        ATF_PUBL        0x08    /* publish entry (respond for other host) */
                     65: #define        ATF_USETRAILERS 0x10    /* has requested trailers */

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