2.11BSD#431 - /usr/src/sys/vaxif/if_en.h

   1: /*
   2:  * Copyright (c) 1982, 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:  *
   6:  *	@(#)if_en.h	7.1 (Berkeley) 6/5/86
   7:  */
   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: 
  18: #define ENTYPE_PUP  0x0200      /* PUP protocol */
  19: #define ENTYPE_IP   0x0201      /* IP protocol */
  20: 
  21: /*
  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.
  26:  */
  27: #define ENTYPE_TRAIL    0x1000      /* Trailer type */
  28: #define ENTYPE_NTRAILER 16
  29: 
  30: #define EN_BROADCAST    0       /* Hardware broadcast address */

Defined struct's

Defined macros