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1 | /* |
2 | * Copyright (c) 1986 Regents of the University of California. | |
5b519e94 | 3 | * All rights reserved. |
d66f7a18 | 4 | * |
5b519e94 | 5 | * Redistribution and use in source and binary forms are permitted |
50c7758a KB |
6 | * provided that the above copyright notice and this paragraph are |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
5b519e94 | 16 | * |
50c7758a | 17 | * @(#)if_arp.h 7.3 (Berkeley) %G% |
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18 | */ |
19 | ||
20 | /* | |
21 | * Address Resolution Protocol. | |
22 | * | |
23 | * See RFC 826 for protocol description. ARP packets are variable | |
24 | * in size; the arphdr structure defines the fixed-length portion. | |
25 | * Protocol type values are the same as those for 10 Mb/s Ethernet. | |
26 | * It is followed by the variable-sized fields ar_sha, arp_spa, | |
27 | * arp_tha and arp_tpa in that order, according to the lengths | |
28 | * specified. Field names used correspond to RFC 826. | |
29 | */ | |
30 | struct arphdr { | |
31 | u_short ar_hrd; /* format of hardware address */ | |
32 | #define ARPHRD_ETHER 1 /* ethernet hardware address */ | |
33 | u_short ar_pro; /* format of protocol address */ | |
34 | u_char ar_hln; /* length of hardware address */ | |
35 | u_char ar_pln; /* length of protocol address */ | |
36 | u_short ar_op; /* one of: */ | |
37 | #define ARPOP_REQUEST 1 /* request to resolve address */ | |
38 | #define ARPOP_REPLY 2 /* response to previous request */ | |
39 | /* | |
40 | * The remaining fields are variable in size, | |
41 | * according to the sizes above. | |
42 | */ | |
43 | /* u_char ar_sha[]; /* sender hardware address */ | |
44 | /* u_char ar_spa[]; /* sender protocol address */ | |
45 | /* u_char ar_tha[]; /* target hardware address */ | |
46 | /* u_char ar_tpa[]; /* target protocol address */ | |
47 | }; | |
48 | ||
49 | /* | |
50 | * ARP ioctl request | |
51 | */ | |
52 | struct arpreq { | |
53 | struct sockaddr arp_pa; /* protocol address */ | |
54 | struct sockaddr arp_ha; /* hardware address */ | |
55 | int arp_flags; /* flags */ | |
56 | }; | |
57 | /* arp_flags and at_flags field values */ | |
58 | #define ATF_INUSE 0x01 /* entry in use */ | |
59 | #define ATF_COM 0x02 /* completed entry (enaddr valid) */ | |
60 | #define ATF_PERM 0x04 /* permanent entry */ | |
61 | #define ATF_PUBL 0x08 /* publish entry (respond for other host) */ | |
62 | #define ATF_USETRAILERS 0x10 /* has requested trailers */ |