FreeBSD/Linux Kernel Cross Reference
sys/net/ieee_oui.h

     /* 
      * Copyright (c) 2013 The FreeBSD Foundation
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above
     *    copyright notice, this list of conditions and the following
     *    disclaimer in the documentation and/or other materials provided
     *    with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
     * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
     * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR
     * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
     * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD: releng/11.1/sys/net/ieee_oui.h 266462 2014-05-20 02:59:13Z grehan $
     *
     * Author: George V. Neville-Neil
     *
     */
    
    /* Organizationally Unique Identifier assigned by IEEE 14 Nov 2013 */
    #define OUI_FREEBSD_BASE 0x589cfc000000
    #define OUI_FREEBSD(nic) (OUI_FREEBSD_BASE | (nic))
    
    /* 
     * OUIs are most often used to uniquely identify network interfaces
     * and occupy the first 3 bytes of both destination and source MAC
     * addresses.  The following allocations exist so that various
     * software systems associated with FreeBSD can have unique IDs in the
     * absence of hardware.  The use of OUIs for this purpose is not fully
     * fleshed out but is now in common use in virtualization technology.
     * 
     * Allocations from this range are expected to be made using COMMON
     * SENSE by developers.  Do NOT take a large range just because
     * they're currently wide open.  Take the smallest useful range for
     * your system.  We have (2^24 - 2) available addresses (see Reserved
     * Values below) but that is far from infinite.
     *
     * In the event of a conflict arbitration of allocation in this file
     * is subject to core@ approval.
     * 
     * Applications are differentiated based on the high order bit(s) of
     * the remaining three bytes.  Our first allocation has all 0s, the
     * next allocation has the highest bit set.  Allocating in this way
     * gives us 254 allocations of 64K addresses.  Address blocks can be
     * concatenated if necessary.
     *
     * Reserved Values: 0x000000 and 0xffffff are reserved and MUST NOT BE
     * allocated for any reason.
     */
    
    /* Allocate 20 bits to bhyve */
    #define OUI_FREEBSD_BHYVE_LOW   OUI_FREEBSD(0x000001)
    #define OUI_FREEBSD_BHYVE_HIGH  OUI_FREEBSD(0x0fffff)

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