FreeBSD/Linux Kernel Cross Reference
sys/bsd/net/ethernet.h

     /*
      * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_LICENSE_HEADER_START@
      * 
      * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
     * Version 2.0 (the 'License'). You may not use this file except in
     * compliance with the License. Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this
     * file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_LICENSE_HEADER_END@
     */
    /*
     * Fundamental constants relating to ethernet.
     *
     */
    
    #ifndef _NET_ETHERNET_H_
    #define _NET_ETHERNET_H_
    #include <sys/appleapiopts.h>
    
    /*
     * The number of bytes in an ethernet (MAC) address.
     */
    #define ETHER_ADDR_LEN          6
    
    /*
     * The number of bytes in the type field.
     */
    #define ETHER_TYPE_LEN          2
    
    /*
     * The number of bytes in the trailing CRC field.
     */
    #define ETHER_CRC_LEN           4
    
    /*
     * The length of the combined header.
     */
    #define ETHER_HDR_LEN           (ETHER_ADDR_LEN*2+ETHER_TYPE_LEN)
    
    /*
     * The minimum packet length.
     */
    #define ETHER_MIN_LEN           64
    
    /*
     * The maximum packet length.
     */
    #define ETHER_MAX_LEN           1518
    
    /*
     * A macro to validate a length with
     */
    #define ETHER_IS_VALID_LEN(foo) \
            ((foo) >= ETHER_MIN_LEN && (foo) <= ETHER_MAX_LEN)
    
    /*
     * Structure of a 10Mb/s Ethernet header.
     */
    struct  ether_header {
            u_char  ether_dhost[ETHER_ADDR_LEN];
            u_char  ether_shost[ETHER_ADDR_LEN];
            u_short ether_type;
    };
    
    /*
     * Structure of a 48-bit Ethernet address.
     */
    struct  ether_addr {
            u_char octet[ETHER_ADDR_LEN];
    };
    
    #define ether_addr_octet octet
    
    #define ETHERTYPE_PUP           0x0200  /* PUP protocol */
    #define ETHERTYPE_IP            0x0800  /* IP protocol */
    #define ETHERTYPE_ARP           0x0806  /* Addr. resolution protocol */
    #define ETHERTYPE_REVARP        0x8035  /* reverse Addr. resolution protocol */
    #define ETHERTYPE_VLAN          0x8100  /* IEEE 802.1Q VLAN tagging */
    #define ETHERTYPE_IPV6          0x86dd  /* IPv6 */
    #define ETHERTYPE_LOOPBACK      0x9000  /* used to test interfaces */
    /* XXX - add more useful types here */
    
    /*
     * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
     * (type-ETHERTYPE_TRAIL)*512 bytes of data followed
    * by an ETHER type (as given above) and then the (variable-length) header.
    */
   #define ETHERTYPE_TRAIL         0x1000          /* Trailer packet */
   #define ETHERTYPE_NTRAILER      16
   
   #define ETHERMTU        (ETHER_MAX_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
   #define ETHERMIN        (ETHER_MIN_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
   
   #ifdef KERNEL
   #ifdef __APPLE_API_PRIVATE
   struct  ether_addr *ether_aton __P((char *));
   #endif /* __APPLE_API_PRIVATE */
   #endif
   
   #ifndef KERNEL
   #include <sys/cdefs.h>
   
   /*
    * Ethernet address conversion/parsing routines.
    */
   __BEGIN_DECLS
   
   int     ether_hostton __P((char *, struct ether_addr *));
   int     ether_line __P((char *, struct ether_addr *, char *));
   char    *ether_ntoa __P((const struct ether_addr *));
   int     ether_ntohost __P((char *, struct ether_addr *));
   __END_DECLS
   #endif /* !KERNEL */
   
   #endif /* !_NET_ETHERNET_H_ */

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