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71 lines
2.3 KiB
C
71 lines
2.3 KiB
C
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/*
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* Mach Operating System
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* Copyright (c) 1987 Carnegie-Mellon University
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* All rights reserved. The CMU software License Agreement specifies
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* the terms and conditions for use and redistribution.
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*/
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/*
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* Copyright (c) 1986 Regents of the University of California.
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* All rights reserved. The Berkeley software License Agreement
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* specifies the terms and conditions for redistribution.
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*
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* @(#)if_arp.h 7.1 (Berkeley) 6/4/86
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*/
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/*
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* HISTORY
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* 20-Oct-87 Peter King (king) at NeXT, Inc.
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* SUN_RPC: Added Sun's RARP support.
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*/
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/* @(#)if_arp.h 2.1 88/05/18 4.0NFSSRC SMI; from UCB 7.1 6/5/86 */
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/*
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* Address Resolution Protocol.
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*
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* See RFC 826 for protocol description. ARP packets are variable
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* in size; the arphdr structure defines the fixed-length portion.
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* Protocol type values are the same as those for 10 Mb/s Ethernet.
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* It is followed by the variable-sized fields ar_sha, arp_spa,
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* arp_tha and arp_tpa in that order, according to the lengths
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* specified. Field names used correspond to RFC 826.
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*/
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struct arphdr {
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u_short ar_hrd; /* format of hardware address */
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#define ARPHRD_ETHER 1 /* ethernet hardware address */
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u_short ar_pro; /* format of protocol address */
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u_char ar_hln; /* length of hardware address */
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u_char ar_pln; /* length of protocol address */
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u_short ar_op; /* one of: */
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#define ARPOP_REQUEST 1 /* request to resolve address */
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#define ARPOP_REPLY 2 /* response to previous request */
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#define REVARP_REQUEST 3 /* Reverse ARP request (SUN_RPC) */
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#define REVARP_REPLY 4 /* Reverse ARP reply (SUN_RPC) */
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/*
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* The remaining fields are variable in size,
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* according to the sizes above.
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*/
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#ifdef notdef
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u_char ar_sha[]; /* sender hardware address */
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u_char ar_spa[]; /* sender protocol address */
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u_char ar_tha[]; /* target hardware address */
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u_char ar_tpa[]; /* target protocol address */
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#endif
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};
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/*
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* ARP ioctl request
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*/
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struct arpreq {
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struct sockaddr arp_pa; /* protocol address */
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struct sockaddr arp_ha; /* hardware address */
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int arp_flags; /* flags */
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};
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/* arp_flags and at_flags field values */
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#define ATF_INUSE 0x01 /* entry in use */
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#define ATF_COM 0x02 /* completed entry (enaddr valid) */
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#define ATF_PERM 0x04 /* permanent entry */
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#define ATF_PUBL 0x08 /* publish entry (respond for other host) */
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#define ATF_USETRAILERS 0x10 /* has requested trailers */
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