sysdeps/mach/hurd/net/ethernet.h

   1 /* Copyright (C) 1997-2016 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 /* Based on the FreeBSD version of this file. Curiously, that file
  19    lacks a copyright in the header. */
  20
  21 #ifndef __NET_ETHERNET_H
  22 #define __NET_ETHERNET_H 1
  23
  24 #include <sys/cdefs.h>
  25 #include <sys/types.h>
  26 #include <net/if_ether.h>     /* IEEE 802.3 Ethernet constants */
  27
  28 __BEGIN_DECLS
  29
  30 /* This is a name for the 48 bit ethernet address available on many
  31    systems.  */
  32 struct ether_addr
  33 {
  34   uint8_t ether_addr_octet[ETH_ALEN];
  35 };
  36
  37 /* 10Mb/s ethernet header */
  38 struct ether_header
  39 {
  40   uint8_t  ether_dhost[ETH_ALEN];       /* destination eth addr */
  41   uint8_t  ether_shost[ETH_ALEN];       /* source ether addr    */
  42   uint16_t ether_type;                  /* packet type ID field */
  43 };
  44
  45 /* Ethernet protocol ID's */
  46 #define ETHERTYPE_PUP           0x0200          /* Xerox PUP */
  47 #define ETHERTYPE_IP            0x0800          /* IP */
  48 #define ETHERTYPE_ARP           0x0806          /* Address resolution */
  49 #define ETHERTYPE_REVARP        0x8035          /* Reverse ARP */
  50
  51 #define ETHER_ADDR_LEN  ETH_ALEN                 /* size of ethernet addr */
  52 #define ETHER_TYPE_LEN  2                        /* bytes in type field */
  53 #define ETHER_CRC_LEN   4                        /* bytes in CRC field */
  54 #define ETHER_HDR_LEN   ETH_HLEN                 /* total octets in header */
  55 #define ETHER_MIN_LEN   (ETH_ZLEN + ETH_CRC_LEN) /* min packet length */
  56 #define ETHER_MAX_LEN   (ETH_FRAME_LEN + ETH_CRC_LEN) /* max packet length */
  57
  58 /* make sure ethenet length is valid */
  59 #define ETHER_IS_VALID_LEN(foo) \
  60         ((foo) >= ETHER_MIN_LEN && (foo) <= ETHER_MAX_LEN)
  61
  62 /*
  63  * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
  64  * (type-ETHERTYPE_TRAIL)*512 bytes of data followed
  65  * by an ETHER type (as given above) and then the (variable-length) header.
  66  */
  67 #define ETHERTYPE_TRAIL         0x1000          /* Trailer packet */
  68 #define ETHERTYPE_NTRAILER      16
  69
  70 #define ETHERMTU        ETH_DATA_LEN
  71 #define ETHERMIN        (ETHER_MIN_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
  72
  73 __END_DECLS
  74
  75 #endif /* net/ethernet.h */