625 lines
18 KiB
C
625 lines
18 KiB
C
/* Mode: C;
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*
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* Mini ifenslave implementation for busybox
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* Copyright (C) 2005 by Marc Leeman <marc.leeman@barco.com>
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*
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* ifenslave.c: Configure network interfaces for parallel routing.
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*
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* This program controls the Linux implementation of running multiple
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* network interfaces in parallel.
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*
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* Author: Donald Becker <becker@cesdis.gsfc.nasa.gov>
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* Copyright 1994-1996 Donald Becker
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*
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* This program is free software; you can redistribute it
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* and/or modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O
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* Center of Excellence in Space Data and Information Sciences
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* Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771
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*
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* Changes :
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* - 2000/10/02 Willy Tarreau <willy at meta-x.org> :
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* - few fixes. Master's MAC address is now correctly taken from
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* the first device when not previously set ;
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* - detach support : call BOND_RELEASE to detach an enslaved interface.
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* - give a mini-howto from command-line help : # ifenslave -h
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*
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* - 2001/02/16 Chad N. Tindel <ctindel at ieee dot org> :
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* - Master is now brought down before setting the MAC address. In
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* the 2.4 kernel you can't change the MAC address while the device is
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* up because you get EBUSY.
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*
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* - 2001/09/13 Takao Indoh <indou dot takao at jp dot fujitsu dot com>
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* - Added the ability to change the active interface on a mode 1 bond
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* at runtime.
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*
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* - 2001/10/23 Chad N. Tindel <ctindel at ieee dot org> :
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* - No longer set the MAC address of the master. The bond device will
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* take care of this itself
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* - Try the SIOC*** versions of the bonding ioctls before using the
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* old versions
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* - 2002/02/18 Erik Habbinga <erik_habbinga @ hp dot com> :
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* - ifr2.ifr_flags was not initialized in the hwaddr_notset case,
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* SIOCGIFFLAGS now called before hwaddr_notset test
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*
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* - 2002/10/31 Tony Cureington <tony.cureington * hp_com> :
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* - If the master does not have a hardware address when the first slave
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* is enslaved, the master is assigned the hardware address of that
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* slave - there is a comment in bonding.c stating "ifenslave takes
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* care of this now." This corrects the problem of slaves having
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* different hardware addresses in active-backup mode when
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* multiple interfaces are specified on a single ifenslave command
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* (ifenslave bond0 eth0 eth1).
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*
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* - 2003/03/18 - Tsippy Mendelson <tsippy.mendelson at intel dot com> and
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* Shmulik Hen <shmulik.hen at intel dot com>
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* - Moved setting the slave's mac address and opening it, from
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* the application to the driver. This enables support of modes
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* that need to use the unique mac address of each slave.
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* The driver also takes care of closing the slave and restoring its
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* original mac address upon release.
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* In addition, block possibility of enslaving before the master is up.
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* This prevents putting the system in an undefined state.
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*
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* - 2003/05/01 - Amir Noam <amir.noam at intel dot com>
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* - Added ABI version control to restore compatibility between
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* new/old ifenslave and new/old bonding.
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* - Prevent adding an adapter that is already a slave.
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* Fixes the problem of stalling the transmission and leaving
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* the slave in a down state.
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*
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* - 2003/05/01 - Shmulik Hen <shmulik.hen at intel dot com>
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* - Prevent enslaving if the bond device is down.
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* Fixes the problem of leaving the system in unstable state and
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* halting when trying to remove the module.
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* - Close socket on all abnormal exists.
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* - Add versioning scheme that follows that of the bonding driver.
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* current version is 1.0.0 as a base line.
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*
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* - 2003/05/22 - Jay Vosburgh <fubar at us dot ibm dot com>
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* - ifenslave -c was broken; it's now fixed
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* - Fixed problem with routes vanishing from master during enslave
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* processing.
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*
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* - 2003/05/27 - Amir Noam <amir.noam at intel dot com>
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* - Fix backward compatibility issues:
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* For drivers not using ABI versions, slave was set down while
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* it should be left up before enslaving.
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* Also, master was not set down and the default set_mac_address()
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* would fail and generate an error message in the system log.
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* - For opt_c: slave should not be set to the master's setting
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* while it is running. It was already set during enslave. To
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* simplify things, it is now handeled separately.
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*
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* - 2003/12/01 - Shmulik Hen <shmulik.hen at intel dot com>
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* - Code cleanup and style changes
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* set version to 1.1.0
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*/
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//config:config IFENSLAVE
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//config: bool "ifenslave (13 kb)"
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//config: default y
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//config: select PLATFORM_LINUX
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//config: help
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//config: Userspace application to bind several interfaces
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//config: to a logical interface (use with kernel bonding driver).
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//applet:IF_IFENSLAVE(APPLET_NOEXEC(ifenslave, ifenslave, BB_DIR_SBIN, BB_SUID_DROP, ifenslave))
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//kbuild:lib-$(CONFIG_IFENSLAVE) += ifenslave.o interface.o
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//usage:#define ifenslave_trivial_usage
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//usage: "[-cdf] MASTER_IFACE SLAVE_IFACE..."
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//usage:#define ifenslave_full_usage "\n\n"
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//usage: "Configure network interfaces for parallel routing\n"
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//usage: "\n -c Change active slave"
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//usage: "\n -d Remove slave interface from bonding device"
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//usage: "\n -f Force, even if interface is not Ethernet"
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/* //usage: "\n -r Create a receive-only slave" */
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//usage:
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//usage:#define ifenslave_example_usage
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//usage: "To create a bond device, simply follow these three steps:\n"
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//usage: "- ensure that the required drivers are properly loaded:\n"
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//usage: " # modprobe bonding ; modprobe <3c59x|eepro100|pcnet32|tulip|...>\n"
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//usage: "- assign an IP address to the bond device:\n"
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//usage: " # ifconfig bond0 <addr> netmask <mask> broadcast <bcast>\n"
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//usage: "- attach all the interfaces you need to the bond device:\n"
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//usage: " # ifenslave bond0 eth0 eth1 eth2\n"
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//usage: " If bond0 didn't have a MAC address, it will take eth0's. Then, all\n"
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//usage: " interfaces attached AFTER this assignment will get the same MAC addr.\n\n"
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//usage: " To detach a dead interface without setting the bond device down:\n"
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//usage: " # ifenslave -d bond0 eth1\n\n"
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//usage: " To set the bond device down and automatically release all the slaves:\n"
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//usage: " # ifconfig bond0 down\n\n"
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//usage: " To change active slave:\n"
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//usage: " # ifenslave -c bond0 eth0\n"
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#include "libbb.h"
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/* #include <net/if.h> - no. linux/if_bonding.h pulls in linux/if.h */
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#include <linux/if.h>
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//#include <net/if_arp.h> - not needed?
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#include <linux/if_bonding.h>
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#include <linux/sockios.h>
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#include "fix_u32.h" /* hack, so we may include kernel's ethtool.h */
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#include <linux/ethtool.h>
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#ifndef BOND_ABI_VERSION
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# define BOND_ABI_VERSION 2
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#endif
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#ifndef IFNAMSIZ
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# define IFNAMSIZ 16
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#endif
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struct dev_data {
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struct ifreq mtu, flags, hwaddr;
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};
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enum { skfd = 3 }; /* AF_INET socket for ioctl() calls. */
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struct globals {
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unsigned abi_ver; /* userland - kernel ABI version */
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smallint hwaddr_set; /* Master's hwaddr is set */
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struct dev_data master;
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struct dev_data slave;
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};
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#define G (*ptr_to_globals)
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#define abi_ver (G.abi_ver )
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#define hwaddr_set (G.hwaddr_set)
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#define master (G.master )
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#define slave (G.slave )
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#define INIT_G() do { \
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SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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} while (0)
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/* NOINLINEs are placed where it results in smaller code (gcc 4.3.1) */
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static int ioctl_on_skfd(unsigned request, struct ifreq *ifr)
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{
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return ioctl(skfd, request, ifr);
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}
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static int set_ifrname_and_do_ioctl(unsigned request, struct ifreq *ifr, const char *ifname)
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{
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strncpy_IFNAMSIZ(ifr->ifr_name, ifname);
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return ioctl_on_skfd(request, ifr);
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}
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static int get_if_settings(char *ifname, struct dev_data *dd)
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{
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int res;
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res = set_ifrname_and_do_ioctl(SIOCGIFMTU, &dd->mtu, ifname);
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res |= set_ifrname_and_do_ioctl(SIOCGIFFLAGS, &dd->flags, ifname);
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res |= set_ifrname_and_do_ioctl(SIOCGIFHWADDR, &dd->hwaddr, ifname);
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return res;
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}
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static int get_slave_flags(char *slave_ifname)
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{
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return set_ifrname_and_do_ioctl(SIOCGIFFLAGS, &slave.flags, slave_ifname);
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}
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static int set_hwaddr(char *ifname, struct sockaddr *hwaddr)
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{
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struct ifreq ifr;
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memcpy(&(ifr.ifr_hwaddr), hwaddr, sizeof(*hwaddr));
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return set_ifrname_and_do_ioctl(SIOCSIFHWADDR, &ifr, ifname);
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}
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static int set_mtu(char *ifname, int mtu)
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{
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struct ifreq ifr;
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ifr.ifr_mtu = mtu;
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return set_ifrname_and_do_ioctl(SIOCSIFMTU, &ifr, ifname);
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}
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static int set_if_flags(char *ifname, int flags)
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{
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struct ifreq ifr;
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ifr.ifr_flags = flags;
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return set_ifrname_and_do_ioctl(SIOCSIFFLAGS, &ifr, ifname);
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}
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static int set_if_up(char *ifname, int flags)
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{
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int res = set_if_flags(ifname, flags | IFF_UP);
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if (res)
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bb_perror_msg("%s: can't up", ifname);
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return res;
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}
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static int set_if_down(char *ifname, int flags)
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{
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int res = set_if_flags(ifname, flags & ~IFF_UP);
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if (res)
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bb_perror_msg("%s: can't down", ifname);
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return res;
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}
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static int clear_if_addr(char *ifname)
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{
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struct ifreq ifr;
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ifr.ifr_addr.sa_family = AF_INET;
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memset(ifr.ifr_addr.sa_data, 0, sizeof(ifr.ifr_addr.sa_data));
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return set_ifrname_and_do_ioctl(SIOCSIFADDR, &ifr, ifname);
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}
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static int set_if_addr(char *master_ifname, char *slave_ifname)
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{
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#if (SIOCGIFADDR | SIOCSIFADDR \
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| SIOCGIFDSTADDR | SIOCSIFDSTADDR \
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| SIOCGIFBRDADDR | SIOCSIFBRDADDR \
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| SIOCGIFNETMASK | SIOCSIFNETMASK) <= 0xffff
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#define INT uint16_t
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#else
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#define INT int
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#endif
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static const struct {
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INT g_ioctl;
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INT s_ioctl;
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} ifra[] = {
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{ SIOCGIFADDR, SIOCSIFADDR },
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{ SIOCGIFDSTADDR, SIOCSIFDSTADDR },
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{ SIOCGIFBRDADDR, SIOCSIFBRDADDR },
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{ SIOCGIFNETMASK, SIOCSIFNETMASK },
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};
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struct ifreq ifr;
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int res;
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unsigned i;
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for (i = 0; i < ARRAY_SIZE(ifra); i++) {
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res = set_ifrname_and_do_ioctl(ifra[i].g_ioctl, &ifr, master_ifname);
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if (res < 0) {
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ifr.ifr_addr.sa_family = AF_INET;
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memset(ifr.ifr_addr.sa_data, 0,
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sizeof(ifr.ifr_addr.sa_data));
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}
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res = set_ifrname_and_do_ioctl(ifra[i].s_ioctl, &ifr, slave_ifname);
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if (res < 0)
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return res;
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}
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return 0;
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}
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static void change_active(char *master_ifname, char *slave_ifname)
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{
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struct ifreq ifr;
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if (!(slave.flags.ifr_flags & IFF_SLAVE)) {
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bb_error_msg_and_die("%s is not a slave", slave_ifname);
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}
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strncpy_IFNAMSIZ(ifr.ifr_slave, slave_ifname);
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if (set_ifrname_and_do_ioctl(SIOCBONDCHANGEACTIVE, &ifr, master_ifname)
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&& ioctl_on_skfd(BOND_CHANGE_ACTIVE_OLD, &ifr)
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) {
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bb_perror_msg_and_die(
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"master %s, slave %s: can't "
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"change active",
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master_ifname, slave_ifname);
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}
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}
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static NOINLINE int enslave(char *master_ifname, char *slave_ifname)
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{
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struct ifreq ifr;
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int res;
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if (slave.flags.ifr_flags & IFF_SLAVE) {
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bb_error_msg(
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"%s is already a slave",
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slave_ifname);
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return 1;
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}
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res = set_if_down(slave_ifname, slave.flags.ifr_flags);
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if (res)
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return res;
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if (abi_ver < 2) {
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/* Older bonding versions would panic if the slave has no IP
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* address, so get the IP setting from the master.
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*/
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res = set_if_addr(master_ifname, slave_ifname);
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if (res) {
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bb_perror_msg("%s: can't set address", slave_ifname);
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return res;
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}
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} else {
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res = clear_if_addr(slave_ifname);
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if (res) {
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bb_perror_msg("%s: can't clear address", slave_ifname);
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return res;
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}
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}
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if (master.mtu.ifr_mtu != slave.mtu.ifr_mtu) {
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res = set_mtu(slave_ifname, master.mtu.ifr_mtu);
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if (res) {
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bb_perror_msg("%s: can't set MTU", slave_ifname);
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return res;
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}
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}
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if (hwaddr_set) {
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/* Master already has an hwaddr
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* so set it's hwaddr to the slave
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*/
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if (abi_ver < 1) {
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/* The driver is using an old ABI, so
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* the application sets the slave's
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* hwaddr
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*/
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if (set_hwaddr(slave_ifname, &(master.hwaddr.ifr_hwaddr))) {
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bb_perror_msg("%s: can't set hw address",
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slave_ifname);
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goto undo_mtu;
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}
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/* For old ABI the application needs to bring the
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* slave back up
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*/
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if (set_if_up(slave_ifname, slave.flags.ifr_flags))
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goto undo_slave_mac;
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}
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/* The driver is using a new ABI,
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* so the driver takes care of setting
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* the slave's hwaddr and bringing
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* it up again
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*/
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} else {
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/* No hwaddr for master yet, so
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* set the slave's hwaddr to it
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*/
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if (abi_ver < 1) {
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/* For old ABI, the master needs to be
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* down before setting it's hwaddr
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*/
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if (set_if_down(master_ifname, master.flags.ifr_flags))
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goto undo_mtu;
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}
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if (set_hwaddr(master_ifname, &(slave.hwaddr.ifr_hwaddr))) {
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bb_error_msg("%s: can't set hw address",
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master_ifname);
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goto undo_mtu;
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}
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if (abi_ver < 1) {
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/* For old ABI, bring the master
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* back up
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*/
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if (set_if_up(master_ifname, master.flags.ifr_flags))
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goto undo_master_mac;
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}
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hwaddr_set = 1;
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}
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/* Do the real thing */
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strncpy_IFNAMSIZ(ifr.ifr_slave, slave_ifname);
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if (set_ifrname_and_do_ioctl(SIOCBONDENSLAVE, &ifr, master_ifname)
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&& ioctl_on_skfd(BOND_ENSLAVE_OLD, &ifr)
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) {
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goto undo_master_mac;
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}
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return 0;
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/* rollback (best effort) */
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undo_master_mac:
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set_hwaddr(master_ifname, &(master.hwaddr.ifr_hwaddr));
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hwaddr_set = 0;
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goto undo_mtu;
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undo_slave_mac:
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set_hwaddr(slave_ifname, &(slave.hwaddr.ifr_hwaddr));
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undo_mtu:
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set_mtu(slave_ifname, slave.mtu.ifr_mtu);
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return 1;
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}
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static int release(char *master_ifname, char *slave_ifname)
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{
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struct ifreq ifr;
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int res = 0;
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if (!(slave.flags.ifr_flags & IFF_SLAVE)) {
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bb_error_msg("%s is not a slave", slave_ifname);
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return 1;
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}
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strncpy_IFNAMSIZ(ifr.ifr_slave, slave_ifname);
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if (set_ifrname_and_do_ioctl(SIOCBONDRELEASE, &ifr, master_ifname) < 0
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&& ioctl_on_skfd(BOND_RELEASE_OLD, &ifr) < 0
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) {
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return 1;
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}
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if (abi_ver < 1) {
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/* The driver is using an old ABI, so we'll set the interface
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* down to avoid any conflicts due to same MAC/IP
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*/
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res = set_if_down(slave_ifname, slave.flags.ifr_flags);
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}
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/* set to default mtu */
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set_mtu(slave_ifname, 1500);
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return res;
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}
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static NOINLINE void get_drv_info(char *master_ifname)
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{
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struct ifreq ifr;
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struct ethtool_drvinfo info;
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memset(&ifr, 0, sizeof(ifr));
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ifr.ifr_data = (caddr_t)&info;
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info.cmd = ETHTOOL_GDRVINFO;
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/* both fields are 32 bytes long (long enough) */
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strcpy(info.driver, "ifenslave");
|
|
strcpy(info.fw_version, utoa(BOND_ABI_VERSION));
|
|
if (set_ifrname_and_do_ioctl(SIOCETHTOOL, &ifr, master_ifname) < 0) {
|
|
if (errno == EOPNOTSUPP)
|
|
return;
|
|
bb_perror_msg_and_die("%s: SIOCETHTOOL error", master_ifname);
|
|
}
|
|
|
|
abi_ver = bb_strtou(info.fw_version, NULL, 0);
|
|
if (errno)
|
|
bb_error_msg_and_die("%s: SIOCETHTOOL error", master_ifname);
|
|
}
|
|
|
|
int ifenslave_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int ifenslave_main(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
char *master_ifname, *slave_ifname;
|
|
int rv;
|
|
int res;
|
|
unsigned opt;
|
|
enum {
|
|
OPT_c = (1 << 0),
|
|
OPT_d = (1 << 1),
|
|
OPT_f = (1 << 2),
|
|
};
|
|
|
|
INIT_G();
|
|
|
|
opt = getopt32long(argv, "cdfa",
|
|
"change-active\0" No_argument "c"
|
|
"detach\0" No_argument "d"
|
|
"force\0" No_argument "f"
|
|
/* "all-interfaces\0" No_argument "a" */
|
|
);
|
|
argv += optind;
|
|
if (opt & (opt-1)) /* Only one option can be given */
|
|
bb_show_usage();
|
|
|
|
master_ifname = *argv++;
|
|
|
|
/* No interface names - show all interfaces. */
|
|
if (!master_ifname) {
|
|
display_interfaces(NULL);
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
/* Open a basic socket */
|
|
xmove_fd(xsocket(AF_INET, SOCK_DGRAM, 0), skfd);
|
|
|
|
/* Exchange abi version with bonding module */
|
|
get_drv_info(master_ifname);
|
|
|
|
slave_ifname = *argv++;
|
|
if (!slave_ifname) {
|
|
if (opt & (OPT_d|OPT_c)) {
|
|
/* --change or --detach, and no slaves given -
|
|
* show all interfaces. */
|
|
display_interfaces(slave_ifname /* == NULL */);
|
|
return 2; /* why 2? */
|
|
}
|
|
/* A single arg means show the
|
|
* configuration for this interface
|
|
*/
|
|
display_interfaces(master_ifname);
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
if (get_if_settings(master_ifname, &master)) {
|
|
/* Probably a good reason not to go on */
|
|
bb_perror_msg_and_die("%s: can't get settings", master_ifname);
|
|
}
|
|
|
|
/* Check if master is indeed a master;
|
|
* if not then fail any operation
|
|
*/
|
|
if (!(master.flags.ifr_flags & IFF_MASTER))
|
|
bb_error_msg_and_die("%s is not a master", master_ifname);
|
|
|
|
/* Check if master is up; if not then fail any operation */
|
|
if (!(master.flags.ifr_flags & IFF_UP))
|
|
bb_error_msg_and_die("%s is not up", master_ifname);
|
|
|
|
#ifdef WHY_BOTHER
|
|
/* Neither -c[hange] nor -d[etach] -> it's "enslave" then;
|
|
* and -f[orce] is not there too. Check that it's ethernet. */
|
|
if (!(opt & (OPT_d|OPT_c|OPT_f))) {
|
|
/* The family '1' is ARPHRD_ETHER for ethernet. */
|
|
if (master.hwaddr.ifr_hwaddr.sa_family != 1) {
|
|
bb_error_msg_and_die(
|
|
"%s is not ethernet-like (-f overrides)",
|
|
master_ifname);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* Accepts only one slave */
|
|
if (opt & OPT_c) {
|
|
/* Change active slave */
|
|
if (get_slave_flags(slave_ifname)) {
|
|
bb_perror_msg_and_die(
|
|
"%s: can't get flags", slave_ifname);
|
|
}
|
|
change_active(master_ifname, slave_ifname);
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
/* Accepts multiple slaves */
|
|
res = 0;
|
|
do {
|
|
if (opt & OPT_d) {
|
|
/* Detach a slave interface from the master */
|
|
rv = get_slave_flags(slave_ifname);
|
|
if (rv) {
|
|
/* Can't work with this slave, */
|
|
/* remember the error and skip it */
|
|
bb_perror_msg(
|
|
"skipping %s: can't get %s",
|
|
slave_ifname, "flags");
|
|
res = rv;
|
|
continue;
|
|
}
|
|
rv = release(master_ifname, slave_ifname);
|
|
if (rv) {
|
|
bb_perror_msg("can't release %s from %s",
|
|
slave_ifname, master_ifname);
|
|
res = rv;
|
|
}
|
|
} else {
|
|
/* Attach a slave interface to the master */
|
|
rv = get_if_settings(slave_ifname, &slave);
|
|
if (rv) {
|
|
/* Can't work with this slave, */
|
|
/* remember the error and skip it */
|
|
bb_perror_msg(
|
|
"skipping %s: can't get %s",
|
|
slave_ifname, "settings");
|
|
res = rv;
|
|
continue;
|
|
}
|
|
rv = enslave(master_ifname, slave_ifname);
|
|
if (rv) {
|
|
bb_perror_msg("can't enslave %s to %s",
|
|
slave_ifname, master_ifname);
|
|
res = rv;
|
|
}
|
|
}
|
|
} while ((slave_ifname = *argv++) != NULL);
|
|
|
|
if (ENABLE_FEATURE_CLEAN_UP) {
|
|
close(skfd);
|
|
}
|
|
|
|
return res;
|
|
}
|