The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /* -
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2013 The FreeBSD Foundation
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above
   13  *    copyright notice, this list of conditions and the following
   14  *    disclaimer in the documentation and/or other materials provided
   15  *    with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
   18  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   19  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
   20  * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR
   21  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   22  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   23  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   24  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   25  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   26  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   27  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  *
   30  * $FreeBSD: releng/12.0/sys/net/ieee_oui.h 326272 2017-11-27 15:23:17Z pfg $
   31  *
   32  * Author: George V. Neville-Neil
   33  *
   34  */
   35 
   36 /* Organizationally Unique Identifier assigned by IEEE 14 Nov 2013 */
   37 #define OUI_FREEBSD_BASE 0x589cfc000000
   38 #define OUI_FREEBSD(nic) (OUI_FREEBSD_BASE | (nic))
   39 
   40 /* 
   41  * OUIs are most often used to uniquely identify network interfaces
   42  * and occupy the first 3 bytes of both destination and source MAC
   43  * addresses.  The following allocations exist so that various
   44  * software systems associated with FreeBSD can have unique IDs in the
   45  * absence of hardware.  The use of OUIs for this purpose is not fully
   46  * fleshed out but is now in common use in virtualization technology.
   47  * 
   48  * Allocations from this range are expected to be made using COMMON
   49  * SENSE by developers.  Do NOT take a large range just because
   50  * they're currently wide open.  Take the smallest useful range for
   51  * your system.  We have (2^24 - 2) available addresses (see Reserved
   52  * Values below) but that is far from infinite.
   53  *
   54  * In the event of a conflict arbitration of allocation in this file
   55  * is subject to core@ approval.
   56  * 
   57  * Applications are differentiated based on the high order bit(s) of
   58  * the remaining three bytes.  Our first allocation has all 0s, the
   59  * next allocation has the highest bit set.  Allocating in this way
   60  * gives us 254 allocations of 64K addresses.  Address blocks can be
   61  * concatenated if necessary.
   62  *
   63  * Reserved Values: 0x000000 and 0xffffff are reserved and MUST NOT BE
   64  * allocated for any reason.
   65  */
   66 
   67 /* Allocate 20 bits to bhyve */
   68 #define OUI_FREEBSD_BHYVE_LOW   OUI_FREEBSD(0x000001)
   69 #define OUI_FREEBSD_BHYVE_HIGH  OUI_FREEBSD(0x0fffff)

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