projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| da7c5cc6 KM |
1 | /* |
| 2 | * Copyright (c) 1982 Regents of the University of California. | |
| 3 | * All rights reserved. The Berkeley software License Agreement | |
| 4 | * specifies the terms and conditions for redistribution. | |
| 5 | * | |
| 6 | * @(#)if_en.h 6.3 (Berkeley) %G% | |
| 7 | */ | |
| ce9ee601 BJ |
8 | |
| 9 | /* | |
| 10 | * Structure of a Ethernet header. | |
| 11 | */ | |
| 12 | struct en_header { | |
| 13 | u_char en_shost; | |
| 14 | u_char en_dhost; | |
| 15 | u_short en_type; | |
| 16 | }; | |
| 17 | ||
| 991f6240 SL |
18 | #define ENTYPE_PUP 0x0200 /* PUP protocol */ |
| 19 | #define ENTYPE_IP 0x0201 /* IP protocol */ | |
| 405c9168 | 20 | |
| b454c3ea | 21 | /* |
| 991f6240 SL |
22 | * The ENTYPE_NTRAILER packet types starting at |
| 23 | * ENTYPE_TRAIL have (type-ENTYPE_TRAIL)*512 bytes | |
| 24 | * of data followed by an Ethernet type (as given above) | |
| 25 | * and then the (variable-length) header. | |
| ce9ee601 | 26 | */ |
| 991f6240 SL |
27 | #define ENTYPE_TRAIL 0x1000 /* Trailer type */ |
| 28 | #define ENTYPE_NTRAILER 16 | |
| 7f0e1e06 MK |
29 | |
| 30 | #define EN_BROADCAST 0 /* Hardware broadcast address */ |