mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-26 11:47:31 +00:00
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
/*
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*
|
|
* 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)
|