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06aed4316

Denis Vlasenko
Denis Vlasenko
2008-02-26
FAILED Duration: 26s

Subject

ifenslave: new applet. closes bug 115.

Binary

No binary (build failed)

Architecture & Compiler Flags

Architecture: x86_64-linux-gnu Compiler: gcc (Ubuntu 11.4.0-1ubuntu1~22.04.3) 11.4.0

—

Build Log

(log yok)

Commit Diff GitHub →

include/applets.h +1 -0include/usage.h +26 -0networking/Config.in +7 -0networking/Kbuild +1 -0networking/ifenslave.c +621 -0
include/applets.h+1 -0
@@ -186,6 +186,7 @@ USE_HWCLOCK(APPLET(hwclock, _BB_DIR_SBIN, _BB_SUID_NEVER))
USE_ID(APPLET(id, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
USE_IFCONFIG(APPLET(ifconfig, _BB_DIR_SBIN, _BB_SUID_NEVER))
USE_IFUPDOWN(APPLET_ODDNAME(ifdown, ifupdown, _BB_DIR_SBIN, _BB_SUID_NEVER, ifdown))
+USE_IFENSLAVE(APPLET(ifenslave, _BB_DIR_SBIN, _BB_SUID_NEVER))
USE_IFUPDOWN(APPLET_ODDNAME(ifup, ifupdown, _BB_DIR_SBIN, _BB_SUID_NEVER, ifup))
USE_INETD(APPLET(inetd, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
USE_INIT(APPLET(init, _BB_DIR_SBIN, _BB_SUID_NEVER))
include/usage.h+26 -0
@@ -1563,6 +1563,32 @@ USE_FEATURE_BRCTL_FANCY("\n" \
" [mem_start NN] [io_addr NN] [irq NN]\n") \
" [up|down] ..."
+#define ifenslave_trivial_usage \
+ "[-cdf] master-iface <slave-iface...>"
+#define ifenslave_full_usage \
+ "Configure network interfaces for parallel routing\n\n" \
+ "Options:" \
+ "\n -c, --change-active Change active slave" \
+ "\n -d, --detach Remove slave interface from bonding device" \
+ "\n -f, --force Force, even if interface is not Ethernet" \
+/* "\n -r, --receive-slave Create a receive-only slave" */
+#define ifenslave_example_usage \
+ "To create a bond device, simply follow these three steps :\n" \
+ "- ensure that the required drivers are properly loaded :\n" \
+ " # modprobe bonding ; modprobe <3c59x|eepro100|pcnet32|tulip|...>\n" \
+ "- assign an IP address to the bond device :\n" \
+ " # ifconfig bond0 <addr> netmask <mask> broadcast <bcast>\n" \
+ "- attach all the interfaces you need to the bond device :\n" \
+ " # ifenslave bond0 eth0 eth1 eth2\n" \
+ " If bond0 didn't have a MAC address, it will take eth0's. Then, all\n" \
+ " interfaces attached AFTER this assignment will get the same MAC addr.\n\n" \
+ " To detach a dead interface without setting the bond device down :\n" \
+ " # ifenslave -d bond0 eth1\n\n" \
+ " To set the bond device down and automatically release all the slaves :\n" \
+ " # ifconfig bond0 down\n\n" \
+ " To change active slave :\n" \
+ " # ifenslave -c bond0 eth0\n"
+
#define ifup_trivial_usage \
"[-ahinv] ifaces..."
#define ifup_full_usage \
networking/Config.in+7 -0
@@ -292,6 +292,13 @@ config FEATURE_IFCONFIG_BROADCAST_PLUS
Setting this will make ifconfig attempt to find the broadcast
automatically if the value '+' is used.
+config IFENSLAVE
+ bool "ifenslave"
+ default n
+ help
+ Userspace application to bind several interfaces
+ to a logical interface (use with kernel bonding driver).
+
config IFUPDOWN
bool "ifupdown"
default n
networking/Kbuild+1 -0
@@ -17,6 +17,7 @@ lib-$(CONFIG_FTPPUT) += ftpgetput.o
lib-$(CONFIG_HOSTNAME) += hostname.o
lib-$(CONFIG_HTTPD) += httpd.o
lib-$(CONFIG_IFCONFIG) += ifconfig.o interface.o
+lib-$(CONFIG_IFENSLAVE) += ifenslave.o
lib-$(CONFIG_IFUPDOWN) += ifupdown.o
lib-$(CONFIG_INETD) += inetd.o
lib-$(CONFIG_IP) += ip.o
networking/ifenslave.c+621 -0
@@ -0,0 +1,621 @@
+/* Mode: C;
+ *
+ * Mini ifenslave implementation for busybox
+ * Copyright (C) 2005 by Marc Leeman <[email protected]>
+ *
+ * ifenslave.c: Configure network interfaces for parallel routing.
+ *
+ * This program controls the Linux implementation of running multiple
+ * network interfaces in parallel.
+ *
+ * Author: Donald Becker <[email protected]>
+ * 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 [email protected], 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 openning 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.
+ * This prevents putting the system in an undefined state.
+ *
+ * - 2003/05/01 - Amir Noam <amir.noam at intel dot com>
+ * - Added ABI version control to restore compatibility between
+ * new/old ifenslave and new/old bonding.
+ * - Prevent adding an adapter that is already a slave.
+ * Fixes the problem of stalling the transmission and leaving
+ * the slave in a down state.
+ *
+ * - 2003/05/01 - Shmulik Hen <shmulik.hen at intel dot com>
+ * - Prevent enslaving if the bond device is down.
+ * Fixes the problem of leaving the system in unstable state and
+ * halting when trying to remove the module.
+ * - Close socket on all abnormal exists.
+ * - Add versioning scheme that follows that of the bonding driver.
+ * current version is 1.0.0 as a base line.
+ *
+ * - 2003/05/22 - Jay Vosburgh <fubar at us dot ibm dot com>
+ * - ifenslave -c was broken; it's now fixed
+ * - Fixed problem with routes vanishing from master during enslave
+ * processing.
+ *
+ * - 2003/05/27 - Amir Noam <amir.noam at intel dot com>
+ * - Fix backward compatibility issues:
+ * For drivers not using ABI versions, slave was set down while
+ * it should be left up before enslaving.
+ * Also, master was not set down and the default set_mac_address()
+ * would fail and generate an error message in the system log.
+ * - For opt_c: slave should not be set to the master's setting
+ * while it is running. It was already set during enslave. To
+ * simplify things, it is now handeled separately.
+ *
+ * - 2003/12/01 - Shmulik Hen <shmulik.hen at intel dot com>
+ * - Code cleanup and style changes
+ * set version to 1.1.0
+ */
+
+#include "libbb.h"
+
+#include <net/if_arp.h>
+#include <linux/if_bonding.h>
+#include <linux/sockios.h>
+
+typedef unsigned long long u64; /* hack, so we may include kernel's ethtool.h */
+typedef uint32_t u32; /* ditto */
+typedef uint16_t u16; /* ditto */
+typedef uint8_t u8; /* ditto */
+#include <linux/ethtool.h>
+
+
+struct dev_data {
+ struct ifreq mtu, flags, hwaddr;
+};
+
+
+enum { skfd = 3 }; /* AF_INET socket for ioctl() calls.*/
+struct globals {
+ unsigned abi_ver; /* userland - kernel ABI version */
+ smallint hwaddr_set; /* Master's hwaddr is set */
+ struct dev_data master;
+ struct dev_data slave;
+};
+#define G (*ptr_to_globals)
+#define abi_ver (G.abi_ver )
+#define hwaddr_set (G.hwaddr_set)
+#define master (G.master )
+#define slave (G.slave )
+#define INIT_G() do { \
+ PTR_TO_GLOBALS = xzalloc(sizeof(G)); \
+} while (0)
+
+
+static void get_drv_info(char *master_ifname);
+static int get_if_settings(char *ifname, struct dev_data *dd);
+static int get_slave_flags(char *slave_ifname);
+static int set_master_hwaddr(char *master_ifname, struct sockaddr *hwaddr);
+static int set_slave_hwaddr(char *slave_ifname, struct sockaddr *hwaddr);
+static int set_slave_mtu(char *slave_ifname, int mtu);
+static int set_if_flags(char *ifname, short flags);
+static int set_if_up(char *ifname, short flags);
+static int set_if_down(char *ifname, short flags);
+static int clear_if_addr(char *ifname);
+static int set_if_addr(char *master_ifname, char *slave_ifname);
+static void change_active(char *master_ifname, char *slave_ifname);
+static int enslave(char *master_ifname, char *slave_ifname);
+static int release(char *master_ifname, char *slave_ifname);
+
+
+int ifenslave_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int ifenslave_main(int argc, 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),
+ };
+#if ENABLE_GETOPT_LONG
+ static const char ifenslave_longopts[] ALIGN1 =
+ "change-active" No_argument "c"
+ "detach" No_argument "d"
+ "force" No_argument "f"
+ ;
+
+ applet_long_options = ifenslave_longopts;
+#endif
+ opt = getopt32(argv, "cdf");
+ argv += optind;
+ if (opt & (opt-1)) /* options check */
+ bb_show_usage();
+
+ /* Copy the interface name */
+ master_ifname = *argv++;
+
+ /* No remaining args means 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)) {
+ display_interfaces(slave_ifname);
+ return 2; /* why? */
+ }
+ /* A single arg means show the
+ * configuration for this interface
+ */
+ display_interfaces(master_ifname);
+ return EXIT_SUCCESS;
+ }
+
+ res = get_if_settings(master_ifname, &master);
+ if (res) {
+ /* 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);
+
+ /* Only for enslaving */
+ if (!(opt & (OPT_c|OPT_d))) {
+ sa_family_t master_family = master.hwaddr.ifr_hwaddr.sa_family;
+
+ /* The family '1' is ARPHRD_ETHER for ethernet. */
+ if (master_family != 1 && !(opt & OPT_f)) {
+ bb_error_msg_and_die(
+ "%s is not ethernet-like (-f overrides)",
+ master_ifname);
+ }
+ }
+
+ /* Accepts only one slave */
+ if (opt & OPT_c) {
+ /* change active slave */
+ res = get_slave_flags(slave_ifname);
+ if (res) {
+ bb_perror_msg_and_die(
+ "%s: can't get flags", slave_ifname);
+ }
+ change_active(master_ifname, slave_ifname);
+ return EXIT_SUCCESS;
+ }
+
+ /* Accept 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 flags",
+ slave_ifname);
+ res = rv;
+ continue;
+ }
+ rv = release(master_ifname, slave_ifname);
+ if (rv) {
+ bb_perror_msg(
+ "master %s, slave %s: "
+ "can't release",
+ master_ifname, slave_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 settings",
+ slave_ifname);
+ res = rv;
+ continue;
+ }
+ rv = enslave(master_ifname, slave_ifname);
+ if (rv) {
+ bb_perror_msg(
+ "master %s, slave %s: "
+ "can't enslave",
+ master_ifname, slave_ifname);
+ res = rv;
+ }
+ }
+ } while ((slave_ifname = *argv++) != NULL);
+
+ if (ENABLE_FEATURE_CLEAN_UP) {
+ close(skfd);
+ }
+
+ return res;
+}
+
+static void get_drv_info(char *master_ifname)
+{
+ struct ifreq ifr;
+ struct ethtool_drvinfo info;
+
+ memset(&ifr, 0, sizeof(ifr));
+ strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
+ ifr.ifr_data = (caddr_t)&info;
+
+ info.cmd = ETHTOOL_GDRVINFO;
+ strncpy(info.driver, "ifenslave", 32);
+ snprintf(info.fw_version, 32, "%d", BOND_ABI_VERSION);
+
+ if (ioctl(skfd, SIOCETHTOOL, &ifr) < 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);
+
+ return;
+}
+
+static void change_active(char *master_ifname, char *slave_ifname)
+{
+ struct ifreq ifr;
+
+ if (!(slave.flags.ifr_flags & IFF_SLAVE)) {
+ bb_error_msg_and_die(
+ "%s is not a slave",
+ slave_ifname);
+ }
+
+ strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
+ strncpy(ifr.ifr_slave, slave_ifname, IFNAMSIZ);
+ if (ioctl(skfd, SIOCBONDCHANGEACTIVE, &ifr) < 0
+ && ioctl(skfd, BOND_CHANGE_ACTIVE_OLD, &ifr) < 0
+ ) {
+ bb_perror_msg_and_die(
+ "master %s, slave %s: can't "
+ "change active",
+ master_ifname, slave_ifname);
+ }
+}
+
+static int enslave(char *master_ifname, char *slave_ifname)
+{
+ struct ifreq ifr;
+ int res;
+
+ if (slave.flags.ifr_flags & IFF_SLAVE) {
+ bb_error_msg(
+ "%s is already a slave",
+ slave_ifname);
+ return 1;
+ }
+
+ res = set_if_down(slave_ifname, slave.flags.ifr_flags);
+ if (res)
+ return res;
+
+ 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;
+}