bsd/net/ethernet.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Fundamental constants relating to ethernet.
  24  *
  25  */
  26
  27 #ifndef _NET_ETHERNET_H_
  28 #define _NET_ETHERNET_H_
  29
  30 /*
  31  * The number of bytes in an ethernet (MAC) address.
  32  */
  33 #define ETHER_ADDR_LEN          6
  34
  35 /*
  36  * The number of bytes in the type field.
  37  */
  38 #define ETHER_TYPE_LEN          2
  39
  40 /*
  41  * The number of bytes in the trailing CRC field.
  42  */
  43 #define ETHER_CRC_LEN           4
  44
  45 /*
  46  * The length of the combined header.
  47  */
  48 #define ETHER_HDR_LEN           (ETHER_ADDR_LEN*2+ETHER_TYPE_LEN)
  49
  50 /*
  51  * The minimum packet length.
  52  */
  53 #define ETHER_MIN_LEN           64
  54
  55 /*
  56  * The maximum packet length.
  57  */
  58 #define ETHER_MAX_LEN           1518
  59
  60 /*
  61  * A macro to validate a length with
  62  */
  63 #define ETHER_IS_VALID_LEN(foo) \
  64         ((foo) >= ETHER_MIN_LEN && (foo) <= ETHER_MAX_LEN)
  65
  66 /*
  67  * Structure of a 10Mb/s Ethernet header.
  68  */
  69 struct  ether_header {
  70         u_char  ether_dhost[ETHER_ADDR_LEN];
  71         u_char  ether_shost[ETHER_ADDR_LEN];
  72         u_short ether_type;
  73 };
  74
  75 /*
  76  * Structure of a 48-bit Ethernet address.
  77  */
  78 struct  ether_addr {
  79         u_char octet[ETHER_ADDR_LEN];
  80 };
  81
  82 #define ether_addr_octet octet
  83
  84 #define ETHERTYPE_PUP           0x0200  /* PUP protocol */
  85 #define ETHERTYPE_IP            0x0800  /* IP protocol */
  86 #define ETHERTYPE_ARP           0x0806  /* Addr. resolution protocol */
  87 #define ETHERTYPE_REVARP        0x8035  /* reverse Addr. resolution protocol */
  88 #define ETHERTYPE_VLAN          0x8100  /* IEEE 802.1Q VLAN tagging */
  89 #define ETHERTYPE_IPV6          0x86dd  /* IPv6 */
  90 #define ETHERTYPE_LOOPBACK      0x9000  /* used to test interfaces */
  91 /* XXX - add more useful types here */
  92
  93 /*
  94  * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
  95  * (type-ETHERTYPE_TRAIL)*512 bytes of data followed
  96  * by an ETHER type (as given above) and then the (variable-length) header.
  97  */
  98 #define ETHERTYPE_TRAIL         0x1000          /* Trailer packet */
  99 #define ETHERTYPE_NTRAILER      16
 100
 101 #define ETHERMTU        (ETHER_MAX_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
 102 #define ETHERMIN        (ETHER_MIN_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
 103
 104 #if KERNEL
 105 struct  ether_addr *ether_aton __P((char *));
 106 #endif
 107
 108 #if !KERNEL
 109 #include <sys/cdefs.h>
 110
 111 /*
 112  * Ethernet address conversion/parsing routines.
 113  */
 114 __BEGIN_DECLS
 115
 116 int     ether_hostton __P((char *, struct ether_addr *));
 117 int     ether_line __P((char *, struct ether_addr *, char *));
 118 char    *ether_ntoa __P((struct ether_addr *));
 119 int     ether_ntohost __P((char *, struct ether_addr *));
 120 __END_DECLS
 121 #endif /* !KERNEL */
 122
 123 #endif /* !_NET_ETHERNET_H_ */