5 /* $NetBSD: if_arp.h,v 1.12 1997/09/08 02:06:30 mikel Exp $ */
8 * Copyright (c) 1986, 1993
9 * The Regents of the University of California. All rights reserved.
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21 * This product includes software developed by the University of
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39 * @(#)if_arp.h 8.1 (Berkeley) 6/10/93
42 #ifndef __NET_IF_ARP_H
43 #define __NET_IF_ARP_H
45 * Address Resolution Protocol.
47 * See RFC 826 for protocol description. ARP packets are variable
48 * in size; the arphdr structure defines the fixed-length portion.
49 * Protocol type values are the same as those for 10 Mb/s Ethernet.
50 * It is followed by the variable-sized fields ar_sha, arp_spa,
51 * arp_tha and arp_tpa in that order, according to the lengths
52 * specified. Field names used correspond to RFC 826.
55 #include <sys/packon.h>
58 u_int16_t ar_hrd; /* format of hardware address */
59 #define ARPHRD_ETHER 1 /* ethernet hardware format */
60 #define ARPHRD_TOKEN 6 /* TokenRing hardware format */
61 #define ARPHRD_ARCNET 7 /* ethernet hardware format */
62 #define ARPHRD_FRELAY 15 /* frame relay hardware format */
63 #define ARPHRD_STRIP 23 /* Ricochet Starmode Radio hardware format */
64 u_int16_t ar_pro; /* format of protocol address */
65 u_int8_t ar_hln; /* length of hardware address */
66 u_int8_t ar_pln; /* length of protocol address */
67 u_int16_t ar_op; /* one of: */
68 #define ARPOP_REQUEST 1 /* request to resolve address */
69 #define ARPOP_REPLY 2 /* response to previous request */
70 #define ARPOP_REVREQUEST 3 /* request protocol address given hardware */
71 #define ARPOP_REVREPLY 4 /* response giving protocol address */
72 #define ARPOP_INVREQUEST 8 /* request to identify peer */
73 #define ARPOP_INVREPLY 9 /* response identifying peer */
75 * The remaining fields are variable in size,
76 * according to the sizes above.
79 u_int8_t ar_sha[]; /* sender hardware address */
80 u_int8_t ar_spa[]; /* sender protocol address */
81 u_int8_t ar_tha[]; /* target hardware address */
82 u_int8_t ar_tpa[]; /* target protocol address */
84 #ifdef __GNUC__ /* only GNU C allows zero arrays */
85 u_int8_t ar_remain[0]; /* minimum size, normally bigger */
86 #define ar_sha(ap) (((ap)->ar_remain)+0)
87 #define ar_spa(ap) (((ap)->ar_remain)+(ap)->ar_hln)
88 #define ar_tha(ap) (((ap)->ar_remain)+(ap)->ar_hln+(ap)->ar_pln)
89 #define ar_tpa(ap) (((ap)->ar_remain)+2*(ap)->ar_hln+(ap)->ar_pln)
91 #define ar_sha(ap) (((ap)->ar_op)+2)
92 #define ar_spa(ap) (((ap)->ar_op)+2+(ap)->ar_hln)
93 #define ar_tha(ap) (((ap)->ar_op)+2+(ap)->ar_hln+(ap)->ar_pln)
94 #define ar_tpa(ap) (((ap)->ar_op)+2+2*(ap)->ar_hln+(ap)->ar_pln)
103 struct sockaddr arp_pa; /* protocol address */
104 struct sockaddr arp_ha; /* hardware address */
105 int arp_flags; /* flags */
108 #include <sys/packoff.h>
110 /* arp_flags and at_flags field values */
111 #define ATF_INUSE 0x01 /* entry in use */
112 #define ATF_COM 0x02 /* completed entry (enaddr valid) */
113 #define ATF_PERM 0x04 /* permanent entry */
114 #define ATF_PUBL 0x08 /* publish entry (respond for other host) */
115 #define ATF_USETRAILERS 0x10 /* has requested trailers */