FreeBSD/Linux Kernel Cross Reference
sys/net/if_arp.h
1 /* $NetBSD: if_arp.h,v 1.24 2003/08/07 16:32:50 agc Exp $ */
2
3 /*
4 * Copyright (c) 1986, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)if_arp.h 8.1 (Berkeley) 6/10/93
32 */
33
34 #ifndef _NET_IF_ARP_H_
35 #define _NET_IF_ARP_H_
36 /*
37 * Address Resolution Protocol.
38 *
39 * See RFC 826 for protocol description. ARP packets are variable
40 * in size; the arphdr structure defines the fixed-length portion.
41 * Protocol type values are the same as those for 10 Mb/s Ethernet.
42 * It is followed by the variable-sized fields ar_sha, arp_spa,
43 * arp_tha and arp_tpa in that order, according to the lengths
44 * specified. Field names used correspond to RFC 826.
45 */
46 struct arphdr {
47 u_int16_t ar_hrd; /* format of hardware address */
48 #define ARPHRD_ETHER 1 /* ethernet hardware format */
49 #define ARPHRD_IEEE802 6 /* IEEE 802 hardware format */
50 #define ARPHRD_ARCNET 7 /* ethernet hardware format */
51 #define ARPHRD_FRELAY 15 /* frame relay hardware format */
52 #define ARPHRD_STRIP 23 /* Ricochet Starmode Radio hardware format */
53 #define ARPHRD_IEEE1394 24 /* IEEE 1394 (FireWire) hardware format */
54 u_int16_t ar_pro; /* format of protocol address */
55 u_int8_t ar_hln; /* length of hardware address */
56 u_int8_t ar_pln; /* length of protocol address */
57 u_int16_t ar_op; /* one of: */
58 #define ARPOP_REQUEST 1 /* request to resolve address */
59 #define ARPOP_REPLY 2 /* response to previous request */
60 #define ARPOP_REVREQUEST 3 /* request protocol address given hardware */
61 #define ARPOP_REVREPLY 4 /* response giving protocol address */
62 #define ARPOP_INVREQUEST 8 /* request to identify peer */
63 #define ARPOP_INVREPLY 9 /* response identifying peer */
64 /*
65 * The remaining fields are variable in size,
66 * according to the sizes above.
67 */
68 #ifdef COMMENT_ONLY
69 u_int8_t ar_sha[]; /* sender hardware address */
70 u_int8_t ar_spa[]; /* sender protocol address */
71 u_int8_t ar_tha[]; /* target hardware address */
72 u_int8_t ar_tpa[]; /* target protocol address */
73 #endif
74 #define ar_sha(ap) (((caddr_t)((ap)+1))+0)
75 #define ar_spa(ap) (((caddr_t)((ap)+1))+(ap)->ar_hln)
76 #define ar_tha(ap) \
77 (ntohs((ap)->ar_hrd) == ARPHRD_IEEE1394 \
78 ? NULL : (((caddr_t)((ap)+1))+(ap)->ar_hln+(ap)->ar_pln))
79 #define ar_tpa(ap) \
80 (ntohs((ap)->ar_hrd) == ARPHRD_IEEE1394 \
81 ? (((caddr_t)((ap)+1))+(ap)->ar_hln+(ap)->ar_pln) \
82 : (((caddr_t)((ap)+1))+(ap)->ar_hln+(ap)->ar_pln+(ap)->ar_hln))
83 } __attribute__((__packed__));
84
85
86 /*
87 * ARP ioctl request
88 */
89 struct arpreq {
90 struct sockaddr arp_pa; /* protocol address */
91 struct sockaddr arp_ha; /* hardware address */
92 int arp_flags; /* flags */
93 };
94 /* arp_flags and at_flags field values */
95 #define ATF_INUSE 0x01 /* entry in use */
96 #define ATF_COM 0x02 /* completed entry (enaddr valid) */
97 #define ATF_PERM 0x04 /* permanent entry */
98 #define ATF_PUBL 0x08 /* publish entry (respond for other host) */
99 #define ATF_USETRAILERS 0x10 /* has requested trailers */
100
101 /*
102 * Kernel statistics about arp
103 */
104 struct arpstat {
105 u_quad_t as_sndtotal; /* total packets sent */
106 u_quad_t as_sndreply; /* replies sent */
107 u_quad_t as_sndrequest; /* requests sent */
108
109 u_quad_t as_rcvtotal; /* total packets received */
110 u_quad_t as_rcvrequest; /* valid requests received */
111 u_quad_t as_rcvreply; /* replies received */
112 u_quad_t as_rcvmcast; /* multicast/broadcast received */
113 u_quad_t as_rcvbadproto; /* unknown protocol type received */
114 u_quad_t as_rcvbadlen; /* bad (short) length received */
115 u_quad_t as_rcvzerotpa; /* received w/ null target ip */
116 u_quad_t as_rcvzerospa; /* received w/ null src ip */
117 u_quad_t as_rcvnoint; /* couldn't map to interface */
118 u_quad_t as_rcvlocalsha; /* received from local hw address */
119 u_quad_t as_rcvbcastsha; /* received w/ broadcast src */
120 u_quad_t as_rcvlocalspa; /* received for a local ip [dup!] */
121 u_quad_t as_rcvoverperm; /* attempts to overwrite static info */
122 u_quad_t as_rcvoverint; /* attempts to overwrite wrong if */
123 u_quad_t as_rcvover; /* entries overwritten! */
124 u_quad_t as_rcvlenchg; /* changes in hw add len */
125
126 u_quad_t as_dfrtotal; /* deferred pending ARP resolution. */
127 u_quad_t as_dfrsent; /* deferred, then sent */
128 u_quad_t as_dfrdropped; /* deferred, then dropped */
129
130 u_quad_t as_allocfail; /* Failures to allocate llinfo */
131 };
132
133 #endif /* _NET_IF_ARP_H_ */
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