projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| d66f7a18 MK |
1 | /* |
| 2 | * Copyright (c) 1986 Regents of the University of California. | |
| 3 | * All rights reserved. The Berkeley software License Agreement | |
| 4 | * specifies the terms and conditions for redistribution. | |
| 5 | * | |
| 1810611d | 6 | * @(#)if_arp.h 7.1 (Berkeley) %G% |
| d66f7a18 MK |
7 | */ |
| 8 | ||
| 9 | /* | |
| 10 | * Address Resolution Protocol. | |
| 11 | * | |
| 12 | * See RFC 826 for protocol description. ARP packets are variable | |
| 13 | * in size; the arphdr structure defines the fixed-length portion. | |
| 14 | * Protocol type values are the same as those for 10 Mb/s Ethernet. | |
| 15 | * It is followed by the variable-sized fields ar_sha, arp_spa, | |
| 16 | * arp_tha and arp_tpa in that order, according to the lengths | |
| 17 | * specified. Field names used correspond to RFC 826. | |
| 18 | */ | |
| 19 | struct arphdr { | |
| 20 | u_short ar_hrd; /* format of hardware address */ | |
| 21 | #define ARPHRD_ETHER 1 /* ethernet hardware address */ | |
| 22 | u_short ar_pro; /* format of protocol address */ | |
| 23 | u_char ar_hln; /* length of hardware address */ | |
| 24 | u_char ar_pln; /* length of protocol address */ | |
| 25 | u_short ar_op; /* one of: */ | |
| 26 | #define ARPOP_REQUEST 1 /* request to resolve address */ | |
| 27 | #define ARPOP_REPLY 2 /* response to previous request */ | |
| 28 | /* | |
| 29 | * The remaining fields are variable in size, | |
| 30 | * according to the sizes above. | |
| 31 | */ | |
| 32 | /* u_char ar_sha[]; /* sender hardware address */ | |
| 33 | /* u_char ar_spa[]; /* sender protocol address */ | |
| 34 | /* u_char ar_tha[]; /* target hardware address */ | |
| 35 | /* u_char ar_tpa[]; /* target protocol address */ | |
| 36 | }; | |
| 37 | ||
| 38 | /* | |
| 39 | * ARP ioctl request | |
| 40 | */ | |
| 41 | struct arpreq { | |
| 42 | struct sockaddr arp_pa; /* protocol address */ | |
| 43 | struct sockaddr arp_ha; /* hardware address */ | |
| 44 | int arp_flags; /* flags */ | |
| 45 | }; | |
| 46 | /* arp_flags and at_flags field values */ | |
| 47 | #define ATF_INUSE 0x01 /* entry in use */ | |
| 48 | #define ATF_COM 0x02 /* completed entry (enaddr valid) */ | |
| 49 | #define ATF_PERM 0x04 /* permanent entry */ | |
| 50 | #define ATF_PUBL 0x08 /* publish entry (respond for other host) */ | |
| 51 | #define ATF_USETRAILERS 0x10 /* has requested trailers */ |