busybox

/* Mode: C;

 *

 * Mini ifenslave implementation for busybox

 * Copyright (C) 2005 by Marc Leeman <marc.leeman@barco.com>

 *

 * ifenslave.c: Configure network interfaces for parallel routing.

 *

 *      This program controls the Linux implementation of running multiple

 *      network interfaces in parallel.

 *

 * Author:      Donald Becker <becker@cesdis.gsfc.nasa.gov>

 *              Copyright 1994-1996 Donald Becker

 *

 *              This program is free software; you can redistribute it

 *              and/or modify it under the terms of the GNU General Public

 *              License as published by the Free Software Foundation.

 *

 *      The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O

 *      Center of Excellence in Space Data and Information Sciences

 *         Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771

 *

 *  Changes :

 *    - 2000/10/02 Willy Tarreau <willy at meta-x.org> :

 *       - few fixes. Master's MAC address is now correctly taken from

 *         the first device when not previously set ;

 *       - detach support : call BOND_RELEASE to detach an enslaved interface.

 *       - give a mini-howto from command-line help : # ifenslave -h

 *

 *    - 2001/02/16 Chad N. Tindel <ctindel at ieee dot org> :

 *       - Master is now brought down before setting the MAC address.  In

 *         the 2.4 kernel you can't change the MAC address while the device is

 *         up because you get EBUSY.

 *

 *    - 2001/09/13 Takao Indoh <indou dot takao at jp dot fujitsu dot com>

 *       - Added the ability to change the active interface on a mode 1 bond

 *         at runtime.

 *

 *    - 2001/10/23 Chad N. Tindel <ctindel at ieee dot org> :

 *       - No longer set the MAC address of the master.  The bond device will

 *         take care of this itself

 *       - Try the SIOC*** versions of the bonding ioctls before using the

 *         old versions

 *    - 2002/02/18 Erik Habbinga <erik_habbinga @ hp dot com> :

 *       - ifr2.ifr_flags was not initialized in the hwaddr_notset case,

 *         SIOCGIFFLAGS now called before hwaddr_notset test

 *

 *    - 2002/10/31 Tony Cureington <tony.cureington * hp_com> :

 *       - If the master does not have a hardware address when the first slave

 *         is enslaved, the master is assigned the hardware address of that

 *         slave - there is a comment in bonding.c stating "ifenslave takes

 *         care of this now." This corrects the problem of slaves having

 *         different hardware addresses in active-backup mode when

 *         multiple interfaces are specified on a single ifenslave command

 *         (ifenslave bond0 eth0 eth1).

 *

 *    - 2003/03/18 - Tsippy Mendelson <tsippy.mendelson at intel dot com> and

 *                   Shmulik Hen <shmulik.hen at intel dot com>

 *       - Moved setting the slave's mac address and opening it, from

 *         the application to the driver. This enables support of modes

 *         that need to use the unique mac address of each slave.

 *         The driver also takes care of closing the slave and restoring its

 *         original mac address upon release.

 *         In addition, block possibility of enslaving before the master is up.