Watt-32 tcp/ip  2.2 dev-rel.10
if_arp.h
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1 
5 /* $NetBSD: if_arp.h,v 1.12 1997/09/08 02:06:30 mikel Exp $ */
6 
7 /*
8  * Copyright (c) 1986, 1993
9  * The Regents of the University of California. All rights reserved.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  * notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in the
18  * documentation and/or other materials provided with the distribution.
19  * 3. All advertising materials mentioning features or use of this software
20  * must display the following acknowledgement:
21  * This product includes software developed by the University of
22  * California, Berkeley and its contributors.
23  * 4. Neither the name of the University nor the names of its contributors
24  * may be used to endorse or promote products derived from this software
25  * without specific prior written permission.
26  *
27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30  * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37  * SUCH DAMAGE.
38  *
39  * @(#)if_arp.h 8.1 (Berkeley) 6/10/93
40  */
41 
42 #ifndef __NET_IF_ARP_H
43 #define __NET_IF_ARP_H
44 /*
45  * Address Resolution Protocol.
46  *
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.
53  */
54 
55 #include <sys/pack_on.h>
56 
57 struct arphdr {
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 */
74 /*
75  * The remaining fields are variable in size,
76  * according to the sizes above.
77  */
78 #ifdef COMMENT_ONLY
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 */
83 #endif
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)
90 #else
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)
95 #endif
96 };
97 
98 
99 /*
100  * ARP ioctl request
101  */
102 struct arpreq {
103  struct sockaddr arp_pa; /* protocol address */
104  struct sockaddr arp_ha; /* hardware address */
105  int arp_flags; /* flags */
106 };
107 
108 #include <sys/pack_off.h>
109 
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 */
116 
117 #endif
Definition: if_arp.h:57
Definition: if_arp.h:102