ifenslave: new applet. closes bug 115.
This commit is contained in:
Denis Vlasenko
parent
04bb2d2d06
commit
06aed4316e
@ -186,6 +186,7 @@ USE_HWCLOCK(APPLET(hwclock, _BB_DIR_SBIN, _BB_SUID_NEVER))
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USE_ID(APPLET(id, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
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USE_IFCONFIG(APPLET(ifconfig, _BB_DIR_SBIN, _BB_SUID_NEVER))
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USE_IFUPDOWN(APPLET_ODDNAME(ifdown, ifupdown, _BB_DIR_SBIN, _BB_SUID_NEVER, ifdown))
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USE_IFENSLAVE(APPLET(ifenslave, _BB_DIR_SBIN, _BB_SUID_NEVER))
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USE_IFUPDOWN(APPLET_ODDNAME(ifup, ifupdown, _BB_DIR_SBIN, _BB_SUID_NEVER, ifup))
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USE_INETD(APPLET(inetd, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
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USE_INIT(APPLET(init, _BB_DIR_SBIN, _BB_SUID_NEVER))
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@ -1563,6 +1563,32 @@ USE_FEATURE_BRCTL_FANCY("\n" \
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" [mem_start NN] [io_addr NN] [irq NN]\n") \
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" [up|down] ..."
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#define ifenslave_trivial_usage \
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"[-cdf] master-iface <slave-iface...>"
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#define ifenslave_full_usage \
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"Configure network interfaces for parallel routing\n\n" \
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"Options:" \
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"\n -c, --change-active Change active slave" \
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"\n -d, --detach Remove slave interface from bonding device" \
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"\n -f, --force Force, even if interface is not Ethernet" \
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/* "\n -r, --receive-slave Create a receive-only slave" */
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#define ifenslave_example_usage \
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"To create a bond device, simply follow these three steps :\n" \
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"- ensure that the required drivers are properly loaded :\n" \
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" # modprobe bonding ; modprobe <3c59x|eepro100|pcnet32|tulip|...>\n" \
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"- assign an IP address to the bond device :\n" \
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" # ifconfig bond0 <addr> netmask <mask> broadcast <bcast>\n" \
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"- attach all the interfaces you need to the bond device :\n" \
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" # ifenslave bond0 eth0 eth1 eth2\n" \
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" If bond0 didn't have a MAC address, it will take eth0's. Then, all\n" \
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" interfaces attached AFTER this assignment will get the same MAC addr.\n\n" \
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" To detach a dead interface without setting the bond device down :\n" \
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" # ifenslave -d bond0 eth1\n\n" \
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" To set the bond device down and automatically release all the slaves :\n" \
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" # ifconfig bond0 down\n\n" \
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" To change active slave :\n" \
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" # ifenslave -c bond0 eth0\n"
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#define ifup_trivial_usage \
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"[-ahinv] ifaces..."
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#define ifup_full_usage \
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@ -292,6 +292,13 @@ config FEATURE_IFCONFIG_BROADCAST_PLUS
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Setting this will make ifconfig attempt to find the broadcast
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automatically if the value '+' is used.
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config IFENSLAVE
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bool "ifenslave"
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default n
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help
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Userspace application to bind several interfaces
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to a logical interface (use with kernel bonding driver).
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config IFUPDOWN
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bool "ifupdown"
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default n
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@ -17,6 +17,7 @@ lib-$(CONFIG_FTPPUT) += ftpgetput.o
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lib-$(CONFIG_HOSTNAME) += hostname.o
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lib-$(CONFIG_HTTPD) += httpd.o
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lib-$(CONFIG_IFCONFIG) += ifconfig.o interface.o
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lib-$(CONFIG_IFENSLAVE) += ifenslave.o
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lib-$(CONFIG_IFUPDOWN) += ifupdown.o
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lib-$(CONFIG_INETD) += inetd.o
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lib-$(CONFIG_IP) += ip.o
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621
networking/ifenslave.c
Normal file
621
networking/ifenslave.c
Normal file
@ -0,0 +1,621 @@
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/* 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 openning 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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#include "libbb.h"
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#include <net/if_arp.h>
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#include <linux/if_bonding.h>
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#include <linux/sockios.h>
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typedef unsigned long long u64; /* hack, so we may include kernel's ethtool.h */
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typedef uint32_t u32; /* ditto */
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typedef uint16_t u16; /* ditto */
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typedef uint8_t u8; /* ditto */
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#include <linux/ethtool.h>
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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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PTR_TO_GLOBALS = xzalloc(sizeof(G)); \
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} while (0)
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static void get_drv_info(char *master_ifname);
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static int get_if_settings(char *ifname, struct dev_data *dd);
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static int get_slave_flags(char *slave_ifname);
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static int set_master_hwaddr(char *master_ifname, struct sockaddr *hwaddr);
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static int set_slave_hwaddr(char *slave_ifname, struct sockaddr *hwaddr);
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static int set_slave_mtu(char *slave_ifname, int mtu);
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static int set_if_flags(char *ifname, short flags);
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static int set_if_up(char *ifname, short flags);
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static int set_if_down(char *ifname, short flags);
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static int clear_if_addr(char *ifname);
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static int set_if_addr(char *master_ifname, char *slave_ifname);
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static void change_active(char *master_ifname, char *slave_ifname);
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static int enslave(char *master_ifname, char *slave_ifname);
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static int release(char *master_ifname, char *slave_ifname);
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int ifenslave_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int ifenslave_main(int argc, char **argv)
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{
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char *master_ifname, *slave_ifname;
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int rv;
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int res;
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unsigned opt;
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enum {
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OPT_c = (1 << 0),
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OPT_d = (1 << 1),
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OPT_f = (1 << 2),
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};
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#if ENABLE_GETOPT_LONG
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static const char ifenslave_longopts[] ALIGN1 =
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"change-active" No_argument "c"
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"detach" No_argument "d"
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"force" No_argument "f"
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;
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applet_long_options = ifenslave_longopts;
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#endif
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opt = getopt32(argv, "cdf");
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argv += optind;
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if (opt & (opt-1)) /* options check */
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bb_show_usage();
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/* Copy the interface name */
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master_ifname = *argv++;
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/* No remaining args means show all interfaces. */
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if (!master_ifname) {
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display_interfaces(NULL);
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return EXIT_SUCCESS;
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}
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/* Open a basic socket */
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xmove_fd(xsocket(AF_INET, SOCK_DGRAM, 0), skfd);
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/* exchange abi version with bonding module */
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get_drv_info(master_ifname);
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slave_ifname = *argv++;
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if (!slave_ifname) {
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if (opt & (OPT_d|OPT_c)) {
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display_interfaces(slave_ifname);
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return 2; /* why? */
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}
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/* A single arg means show the
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* configuration for this interface
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*/
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display_interfaces(master_ifname);
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return EXIT_SUCCESS;
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}
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res = get_if_settings(master_ifname, &master);
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if (res) {
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/* Probably a good reason not to go on */
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bb_perror_msg_and_die("%s: can't get settings", master_ifname);
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}
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/* check if master is indeed a master;
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* if not then fail any operation
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*/
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if (!(master.flags.ifr_flags & IFF_MASTER))
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bb_error_msg_and_die("%s is not a master", master_ifname);
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/* check if master is up; if not then fail any operation */
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if (!(master.flags.ifr_flags & IFF_UP))
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bb_error_msg_and_die("%s is not up", master_ifname);
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/* Only for enslaving */
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if (!(opt & (OPT_c|OPT_d))) {
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sa_family_t master_family = master.hwaddr.ifr_hwaddr.sa_family;
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/* The family '1' is ARPHRD_ETHER for ethernet. */
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if (master_family != 1 && !(opt & OPT_f)) {
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bb_error_msg_and_die(
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"%s is not ethernet-like (-f overrides)",
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master_ifname);
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}
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}
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/* Accepts only one slave */
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if (opt & OPT_c) {
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/* change active slave */
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res = get_slave_flags(slave_ifname);
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if (res) {
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bb_perror_msg_and_die(
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"%s: can't get flags", slave_ifname);
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}
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change_active(master_ifname, slave_ifname);
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return EXIT_SUCCESS;
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}
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/* Accept multiple slaves */
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res = 0;
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do {
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if (opt & OPT_d) {
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/* detach a slave interface from the master */
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rv = get_slave_flags(slave_ifname);
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if (rv) {
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/* Can't work with this slave. */
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/* remember the error and skip it*/
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bb_perror_msg(
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"skipping %s: can't get flags",
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slave_ifname);
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res = rv;
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continue;
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}
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rv = release(master_ifname, slave_ifname);
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if (rv) {
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bb_perror_msg(
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"master %s, slave %s: "
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"can't release",
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master_ifname, slave_ifname);
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res = rv;
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}
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} else {
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/* attach a slave interface to the master */
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rv = get_if_settings(slave_ifname, &slave);
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if (rv) {
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/* Can't work with this slave. */
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/* remember the error and skip it*/
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bb_perror_msg(
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"skipping %s: can't get settings",
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slave_ifname);
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res = rv;
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continue;
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}
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rv = enslave(master_ifname, slave_ifname);
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if (rv) {
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bb_perror_msg(
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"master %s, slave %s: "
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"can't enslave",
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master_ifname, slave_ifname);
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res = rv;
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}
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}
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} while ((slave_ifname = *argv++) != NULL);
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if (ENABLE_FEATURE_CLEAN_UP) {
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close(skfd);
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}
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return res;
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}
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static 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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strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
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ifr.ifr_data = (caddr_t)&info;
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info.cmd = ETHTOOL_GDRVINFO;
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strncpy(info.driver, "ifenslave", 32);
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snprintf(info.fw_version, 32, "%d", BOND_ABI_VERSION);
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if (ioctl(skfd, SIOCETHTOOL, &ifr) < 0) {
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if (errno == EOPNOTSUPP)
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return;
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bb_perror_msg_and_die("%s: SIOCETHTOOL error", master_ifname);
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}
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abi_ver = bb_strtou(info.fw_version, NULL, 0);
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if (errno)
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bb_error_msg_and_die("%s: SIOCETHTOOL error", master_ifname);
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return;
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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(
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"%s is not a slave",
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slave_ifname);
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}
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strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
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strncpy(ifr.ifr_slave, slave_ifname, IFNAMSIZ);
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if (ioctl(skfd, SIOCBONDCHANGEACTIVE, &ifr) < 0
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&& ioctl(skfd, BOND_CHANGE_ACTIVE_OLD, &ifr) < 0
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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 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) {
|
||||
/* Older bonding versions would panic if the slave has no IP
|
||||
* address, so get the IP setting from the master.
|
||||
*/
|
||||
res = set_if_addr(master_ifname, slave_ifname);
|
||||
if (res) {
|
||||
bb_perror_msg("%s: can't set address", slave_ifname);
|
||||
return res;
|
||||
}
|
||||
} else {
|
||||
res = clear_if_addr(slave_ifname);
|
||||
if (res) {
|
||||
bb_perror_msg("%s: can't clear address", slave_ifname);
|
||||
return res;
|
||||
}
|
||||
}
|
||||
|
||||
if (master.mtu.ifr_mtu != slave.mtu.ifr_mtu) {
|
||||
res = set_slave_mtu(slave_ifname, master.mtu.ifr_mtu);
|
||||
if (res) {
|
||||
bb_perror_msg("%s: can't set MTU", slave_ifname);
|
||||
return res;
|
||||
}
|
||||
}
|
||||
|
||||
if (hwaddr_set) {
|
||||
/* Master already has an hwaddr
|
||||
* so set it's hwaddr to the slave
|
||||
*/
|
||||
if (abi_ver < 1) {
|
||||
/* The driver is using an old ABI, so
|
||||
* the application sets the slave's
|
||||
* hwaddr
|
||||
*/
|
||||
res = set_slave_hwaddr(slave_ifname,
|
||||
&(master.hwaddr.ifr_hwaddr));
|
||||
if (res) {
|
||||
bb_perror_msg("%s: can't set hw address",
|
||||
slave_ifname);
|
||||
goto undo_mtu;
|
||||
}
|
||||
|
||||
/* For old ABI the application needs to bring the
|
||||
* slave back up
|
||||
*/
|
||||
res = set_if_up(slave_ifname, slave.flags.ifr_flags);
|
||||
if (res)
|
||||
goto undo_slave_mac;
|
||||
}
|
||||
/* The driver is using a new ABI,
|
||||
* so the driver takes care of setting
|
||||
* the slave's hwaddr and bringing
|
||||
* it up again
|
||||
*/
|
||||
} else {
|
||||
/* No hwaddr for master yet, so
|
||||
* set the slave's hwaddr to it
|
||||
*/
|
||||
if (abi_ver < 1) {
|
||||
/* For old ABI, the master needs to be
|
||||
* down before setting it's hwaddr
|
||||
*/
|
||||
res = set_if_down(master_ifname, master.flags.ifr_flags);
|
||||
if (res)
|
||||
goto undo_mtu;
|
||||
}
|
||||
|
||||
res = set_master_hwaddr(master_ifname,
|
||||
&(slave.hwaddr.ifr_hwaddr));
|
||||
if (res) {
|
||||
bb_error_msg("%s: can't set hw address",
|
||||
master_ifname);
|
||||
goto undo_mtu;
|
||||
}
|
||||
|
||||
if (abi_ver < 1) {
|
||||
/* For old ABI, bring the master
|
||||
* back up
|
||||
*/
|
||||
res = set_if_up(master_ifname, master.flags.ifr_flags);
|
||||
if (res)
|
||||
goto undo_master_mac;
|
||||
}
|
||||
|
||||
hwaddr_set = 1;
|
||||
}
|
||||
|
||||
/* Do the real thing */
|
||||
strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
|
||||
strncpy(ifr.ifr_slave, slave_ifname, IFNAMSIZ);
|
||||
if (ioctl(skfd, SIOCBONDENSLAVE, &ifr) < 0
|
||||
&& ioctl(skfd, BOND_ENSLAVE_OLD, &ifr) < 0
|
||||
) {
|
||||
res = 1;
|
||||
}
|
||||
|
||||
if (res)
|
||||
goto undo_master_mac;
|
||||
|
||||
return 0;
|
||||
|
||||
/* rollback (best effort) */
|
||||
undo_master_mac:
|
||||
set_master_hwaddr(master_ifname, &(master.hwaddr.ifr_hwaddr));
|
||||
hwaddr_set = 0;
|
||||
goto undo_mtu;
|
||||
undo_slave_mac:
|
||||
set_slave_hwaddr(slave_ifname, &(slave.hwaddr.ifr_hwaddr));
|
||||
undo_mtu:
|
||||
set_slave_mtu(slave_ifname, slave.mtu.ifr_mtu);
|
||||
return res;
|
||||
}
|
||||
|
||||
static int release(char *master_ifname, char *slave_ifname)
|
||||
{
|
||||
struct ifreq ifr;
|
||||
int res = 0;
|
||||
|
||||
if (!(slave.flags.ifr_flags & IFF_SLAVE)) {
|
||||
bb_error_msg("%s is not a slave",
|
||||
slave_ifname);
|
||||
return 1;
|
||||
}
|
||||
|
||||
strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
|
||||
strncpy(ifr.ifr_slave, slave_ifname, IFNAMSIZ);
|
||||
if (ioctl(skfd, SIOCBONDRELEASE, &ifr) < 0
|
||||
&& ioctl(skfd, BOND_RELEASE_OLD, &ifr) < 0
|
||||
) {
|
||||
return 1;
|
||||
}
|
||||
if (abi_ver < 1) {
|
||||
/* The driver is using an old ABI, so we'll set the interface
|
||||
* down to avoid any conflicts due to same MAC/IP
|
||||
*/
|
||||
res = set_if_down(slave_ifname, slave.flags.ifr_flags);
|
||||
}
|
||||
|
||||
/* set to default mtu */
|
||||
set_slave_mtu(slave_ifname, 1500);
|
||||
|
||||
return res;
|
||||
}
|
||||
|
||||
static int get_if_settings(char *ifname, struct dev_data *dd)
|
||||
{
|
||||
int res;
|
||||
|
||||
strncpy(dd->mtu.ifr_name, ifname, IFNAMSIZ);
|
||||
res = ioctl(skfd, SIOCGIFMTU, &dd->mtu);
|
||||
strncpy(dd->flags.ifr_name, ifname, IFNAMSIZ);
|
||||
res |= ioctl(skfd, SIOCGIFFLAGS, &dd->flags);
|
||||
strncpy(dd->hwaddr.ifr_name, ifname, IFNAMSIZ);
|
||||
res |= ioctl(skfd, SIOCGIFHWADDR, &dd->hwaddr);
|
||||
|
||||
return res;
|
||||
}
|
||||
|
||||
static int get_slave_flags(char *slave_ifname)
|
||||
{
|
||||
strncpy(slave.flags.ifr_name, slave_ifname, IFNAMSIZ);
|
||||
return ioctl(skfd, SIOCGIFFLAGS, &slave.flags);
|
||||
}
|
||||
|
||||
static int set_master_hwaddr(char *master_ifname, struct sockaddr *hwaddr)
|
||||
{
|
||||
struct ifreq ifr;
|
||||
|
||||
strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
|
||||
memcpy(&(ifr.ifr_hwaddr), hwaddr, sizeof(struct sockaddr));
|
||||
return ioctl(skfd, SIOCSIFHWADDR, &ifr);
|
||||
}
|
||||
|
||||
static int set_slave_hwaddr(char *slave_ifname, struct sockaddr *hwaddr)
|
||||
{
|
||||
struct ifreq ifr;
|
||||
|
||||
strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ);
|
||||
memcpy(&(ifr.ifr_hwaddr), hwaddr, sizeof(struct sockaddr));
|
||||
return ioctl(skfd, SIOCSIFHWADDR, &ifr);
|
||||
}
|
||||
|
||||
static int set_slave_mtu(char *slave_ifname, int mtu)
|
||||
{
|
||||
struct ifreq ifr;
|
||||
|
||||
ifr.ifr_mtu = mtu;
|
||||
strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ);
|
||||
return ioctl(skfd, SIOCSIFMTU, &ifr);
|
||||
}
|
||||
|
||||
static int set_if_flags(char *ifname, short flags)
|
||||
{
|
||||
struct ifreq ifr;
|
||||
|
||||
ifr.ifr_flags = flags;
|
||||
strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
|
||||
return ioctl(skfd, SIOCSIFFLAGS, &ifr);
|
||||
}
|
||||
|
||||
static int set_if_up(char *ifname, short flags)
|
||||
{
|
||||
int res = set_if_flags(ifname, flags | IFF_UP);
|
||||
if (res)
|
||||
bb_perror_msg("%s: can't up", ifname);
|
||||
return res;
|
||||
}
|
||||
|
||||
static int set_if_down(char *ifname, short flags)
|
||||
{
|
||||
int res = set_if_flags(ifname, flags & ~IFF_UP);
|
||||
if (res)
|
||||
bb_perror_msg("%s: can't down", ifname);
|
||||
return res;
|
||||
}
|
||||
|
||||
static int clear_if_addr(char *ifname)
|
||||
{
|
||||
struct ifreq ifr;
|
||||
|
||||
strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
|
||||
ifr.ifr_addr.sa_family = AF_INET;
|
||||
memset(ifr.ifr_addr.sa_data, 0, sizeof(ifr.ifr_addr.sa_data));
|
||||
return ioctl(skfd, SIOCSIFADDR, &ifr);
|
||||
}
|
||||
|
||||
static int set_if_addr(char *master_ifname, char *slave_ifname)
|
||||
{
|
||||
static const struct {
|
||||
int g_ioctl;
|
||||
int s_ioctl;
|
||||
} ifra[] = {
|
||||
{ SIOCGIFADDR, SIOCSIFADDR },
|
||||
{ SIOCGIFDSTADDR, SIOCSIFDSTADDR },
|
||||
{ SIOCGIFBRDADDR, SIOCSIFBRDADDR },
|
||||
{ SIOCGIFNETMASK, SIOCSIFNETMASK },
|
||||
};
|
||||
|
||||
struct ifreq ifr;
|
||||
int res;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(ifra); i++) {
|
||||
strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
|
||||
res = ioctl(skfd, ifra[i].g_ioctl, &ifr);
|
||||
if (res < 0) {
|
||||
ifr.ifr_addr.sa_family = AF_INET;
|
||||
memset(ifr.ifr_addr.sa_data, 0,
|
||||
sizeof(ifr.ifr_addr.sa_data));
|
||||
}
|
||||
|
||||
strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ);
|
||||
res = ioctl(skfd, ifra[i].s_ioctl, &ifr);
|
||||
if (res < 0)
|
||||
return res;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user