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 #include <sys/appleapiopts.h>
  30
  31 /*
  32  * The number of bytes in an ethernet (MAC) address.
  33  */
  34 #define ETHER_ADDR_LEN          6
  35
  36 /*
  37  * The number of bytes in the type field.
  38  */
  39 #define ETHER_TYPE_LEN          2
  40
  41 /*
  42  * The number of bytes in the trailing CRC field.
  43  */
  44 #define ETHER_CRC_LEN           4
  45
  46 /*
  47  * The length of the combined header.
  48  */
  49 #define ETHER_HDR_LEN           (ETHER_ADDR_LEN*2+ETHER_TYPE_LEN)
  50
  51 /*
  52  * The minimum packet length.
  53  */
  54 #define ETHER_MIN_LEN           64
  55
  56 /*
  57  * The maximum packet length.
  58  */
  59 #define ETHER_MAX_LEN           1518
  60
  61 /*
  62  * A macro to validate a length with
  63  */
  64 #define ETHER_IS_VALID_LEN(foo) \
  65         ((foo) >= ETHER_MIN_LEN && (foo) <= ETHER_MAX_LEN)
  66
  67 /*
  68  * Structure of a 10Mb/s Ethernet header.
  69  */
  70 struct  ether_header {
  71         u_char  ether_dhost[ETHER_ADDR_LEN];
  72         u_char  ether_shost[ETHER_ADDR_LEN];
  73         u_short ether_type;
  74 };
  75
  76 /*
  77  * Structure of a 48-bit Ethernet address.
  78  */
  79 struct  ether_addr {
  80         u_char octet[ETHER_ADDR_LEN];
  81 };
  82
  83 #define ether_addr_octet octet
  84
  85 #define ETHERTYPE_PUP           0x0200  /* PUP protocol */
  86 #define ETHERTYPE_IP            0x0800  /* IP protocol */
  87 #define ETHERTYPE_ARP           0x0806  /* Addr. resolution protocol */
  88 #define ETHERTYPE_REVARP        0x8035  /* reverse Addr. resolution protocol */
  89 #define ETHERTYPE_VLAN          0x8100  /* IEEE 802.1Q VLAN tagging */
  90 #define ETHERTYPE_IPV6          0x86dd  /* IPv6 */
  91 #define ETHERTYPE_LOOPBACK      0x9000  /* used to test interfaces */
  92 /* XXX - add more useful types here */
  93
  94 /*
  95  * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
  96  * (type-ETHERTYPE_TRAIL)*512 bytes of data followed
  97  * by an ETHER type (as given above) and then the (variable-length) header.
  98  */
  99 #define ETHERTYPE_TRAIL         0x1000          /* Trailer packet */
 100 #define ETHERTYPE_NTRAILER      16
 101
 102 #define ETHERMTU        (ETHER_MAX_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
 103 #define ETHERMIN        (ETHER_MIN_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
 104
 105 #ifdef KERNEL
 106 #ifdef __APPLE_API_PRIVATE
 107 struct  ether_addr *ether_aton __P((char *));
 108 #endif /* __APPLE_API_PRIVATE */
 109 #endif
 110
 111 #ifndef KERNEL
 112 #include <sys/cdefs.h>
 113
 114 /*
 115  * Ethernet address conversion/parsing routines.
 116  */
 117 __BEGIN_DECLS
 118
 119 int     ether_hostton __P((char *, struct ether_addr *));
 120 int     ether_line __P((char *, struct ether_addr *, char *));
 121 char    *ether_ntoa __P((struct ether_addr *));
 122 int     ether_ntohost __P((char *, struct ether_addr *));
 123 __END_DECLS
 124 #endif /* !KERNEL */
 125
 126 #endif /* !_NET_ETHERNET_H_ */