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6902364468
birthday-paradox style address collisions when bhyve VMs are connected to the same broadcoast domain and are using pseudo-random allocations. Reviewed by: gnn MFC after: 1 week
68 lines
2.9 KiB
C
68 lines
2.9 KiB
C
/*
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* Copyright (c) 2013 The FreeBSD Foundation
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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* Author: George V. Neville-Neil
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*
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*/
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/* Organizationally Unique Identifier assigned by IEEE 14 Nov 2013 */
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#define OUI_FREEBSD_BASE 0x589cfc000000
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#define OUI_FREEBSD(nic) (OUI_FREEBSD_BASE | (nic))
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/*
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* OUIs are most often used to uniquely identify network interfaces
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* and occupy the first 3 bytes of both destination and source MAC
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* addresses. The following allocations exist so that various
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* software systems associated with FreeBSD can have unique IDs in the
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* absence of hardware. The use of OUIs for this purpose is not fully
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* fleshed out but is now in common use in virtualization technology.
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*
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* Allocations from this range are expected to be made using COMMON
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* SENSE by developers. Do NOT take a large range just because
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* they're currently wide open. Take the smallest useful range for
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* your system. We have (2^24 - 2) available addresses (see Reserved
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* Values below) but that is far from infinite.
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*
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* In the event of a conflict arbitration of allocation in this file
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* is subject to core@ approval.
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*
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* Applications are differentiated based on the high order bit(s) of
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* the remaining three bytes. Our first allocation has all 0s, the
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* next allocation has the highest bit set. Allocating in this way
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* gives us 254 allocations of 64K addresses. Address blocks can be
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* concatenated if necessary.
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*
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* Reserved Values: 0x000000 and 0xffffff are reserved and MUST NOT BE
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* allocated for any reason.
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*/
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/* Allocate 20 bits to bhyve */
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#define OUI_FREEBSD_BHYVE_LOW OUI_FREEBSD(0x000001)
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#define OUI_FREEBSD_BHYVE_HIGH OUI_FREEBSD(0x0fffff)
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