bonding: remove ifenslave.c from kernel source

As Stephen proposed:
Since bonding supports configuration via iproute (netlink) and sysfs, I think
it is time to purge the old ifenslave code out of Documentation/networking
and update the documentation.

Suggested-by: Stephen Hemminger <[e-mail]>
Cc: Stephen Hemminger <[e-mail]>
Cc: Jay Vosburgh <[e-mail]>
Cc: "David S. Miller" <[e-mail]>
Signed-off-by: Cong Wang <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

Documentation/networking/.gitignore

···
-ifenslave

Documentation/networking/00-INDEX

···
 	- Gianfar Ethernet Driver.
 ieee802154.txt
 	- Linux IEEE 802.15.4 implementation, API and drivers
-ifenslave.c
-	- Configure network interfaces for parallel routing (bonding).
 igb.txt
 	- README for the Intel Gigabit Ethernet Driver (igb).
 igbvf.txt

Documentation/networking/Makefile

···
 # kbuild trick to avoid linker error. Can be omitted if a module is built.
 obj- := dummy.o
 
-# List of programs to build
-hostprogs-y := ifenslave
-
-HOSTCFLAGS_ifenslave.o += -I$(objtree)/usr/include
-
 # Tell kbuild to always build the programs
 always := $(hostprogs-y)
 

Documentation/networking/bonding.txt

···
 ==============================
 
 	Most popular distro kernels ship with the bonding driver
-already available as a module and the ifenslave user level control
-program installed and ready for use. If your distro does not, or you
+already available as a module. If your distro does not, or you
 have need to compile bonding from source (e.g., configuring and
 installing a mainline kernel from kernel.org), you'll need to perform
 the following steps:
···
 driver as module since it is currently the only way to pass parameters
 to the driver or configure more than one bonding device.
 
-	Build and install the new kernel and modules, then continue
-below to install ifenslave.
+	Build and install the new kernel and modules.
 
-1.2 Install ifenslave Control Utility
+1.2 Bonding Control Utility
 -------------------------------------
 
-	The ifenslave user level control program is included in the
-kernel source tree, in the file Documentation/networking/ifenslave.c.
-It is generally recommended that you use the ifenslave that
-corresponds to the kernel that you are using (either from the same
-source tree or supplied with the distro), however, ifenslave
-executables from older kernels should function (but features newer
-than the ifenslave release are not supported).  Running an ifenslave
-that is newer than the kernel is not supported, and may or may not
-work.
-
-	To install ifenslave, do the following:
-
-# gcc -Wall -O -I/usr/src/linux/include ifenslave.c -o ifenslave
-# cp ifenslave /sbin/ifenslave
-
-	If your kernel source is not in "/usr/src/linux," then replace
-"/usr/src/linux/include" in the above with the location of your kernel
-source include directory.
-
-	You may wish to back up any existing /sbin/ifenslave, or, for
-testing or informal use, tag the ifenslave to the kernel version
-(e.g., name the ifenslave executable /sbin/ifenslave-2.6.10).
-
-IMPORTANT NOTE:
-
-	If you omit the "-I" or specify an incorrect directory, you
-may end up with an ifenslave that is incompatible with the kernel
-you're trying to build it for.  Some distros (e.g., Red Hat from 7.1
-onwards) do not have /usr/include/linux symbolically linked to the
-default kernel source include directory.
-
-SECOND IMPORTANT NOTE:
-	If you plan to configure bonding using sysfs or using the
-/etc/network/interfaces file, you do not need to use ifenslave.
+	 It is recommended to configure bonding via iproute2 (netlink)
+or sysfs, the old ifenslave control utility is obsolete.
 
 2. Bonding Driver Options
 =========================
···
 ==============================
 
 	You can configure bonding using either your distro's network
-initialization scripts, or manually using either ifenslave or the
+initialization scripts, or manually using either iproute2 or the
 sysfs interface.  Distros generally use one of three packages for the
 network initialization scripts: initscripts, sysconfig or interfaces.
 Recent versions of these packages have support for bonding, while older
···
 those instances, see the "Configuring Multiple Bonds Manually" section,
 below.
 
-3.3 Configuring Bonding Manually with Ifenslave
+3.3 Configuring Bonding Manually with iproute2
 -----------------------------------------------
 
 	This section applies to distros whose network initialization
···
 	The general method for these systems is to place the bonding
 module parameters into a config file in /etc/modprobe.d/ (as
 appropriate for the installed distro), then add modprobe and/or
-ifenslave commands to the system's global init script.  The name of
+`ip link` commands to the system's global init script.  The name of
 the global init script differs; for sysconfig, it is
 /etc/init.d/boot.local and for initscripts it is /etc/rc.d/rc.local.
 
···
 modprobe bonding mode=balance-alb miimon=100
 modprobe e100
 ifconfig bond0 192.168.1.1 netmask 255.255.255.0 up
-ifenslave bond0 eth0
-ifenslave bond0 eth1
+ip link set eth0 master bond0
+ip link set eth1 master bond0
 
 	Replace the example bonding module parameters and bond0
 network configuration (IP address, netmask, etc) with the appropriate

Documentation/networking/ifenslave.c

···
-/* Mode: C;
- * ifenslave.c: Configure network interfaces for parallel routing.
- *
- *	This program controls the Linux implementation of running multiple
- *	network interfaces in parallel.
- *
- * Author:	Donald Becker <[e-mail]>
- *		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 [e-mail], 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 handled separately.
- *
- *    - 2003/12/01 - Shmulik Hen <shmulik.hen at intel dot com>
- *	 - Code cleanup and style changes
- *	   set version to 1.1.0
- */
-
-#define APP_VERSION	"1.1.0"
-#define APP_RELDATE	"December 1, 2003"
-#define APP_NAME	"ifenslave"
-
-static char *version =
-APP_NAME ".c:v" APP_VERSION " (" APP_RELDATE ")\n"
-"o Donald Becker ([e-mail]).\n"
-"o Detach support added on 2000/10/02 by Willy Tarreau (willy at meta-x.org).\n"
-"o 2.4 kernel support added on 2001/02/16 by Chad N. Tindel\n"
-"  (ctindel at ieee dot org).\n";
-
-static const char *usage_msg =
-"Usage: ifenslave [-f] <master-if> <slave-if> [<slave-if>...]\n"
-"       ifenslave -d   <master-if> <slave-if> [<slave-if>...]\n"
-"       ifenslave -c   <master-if> <slave-if>\n"
-"       ifenslave --help\n";
-
-static const char *help_msg =
-"\n"
-"       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 [{-f|--force}] 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"
-"         (except for ALB/TLB modes)\n"
-"\n"
-"       To set the bond device down and automatically release all the slaves :\n"
-"         # ifconfig bond0 down\n"
-"\n"
-"       To detach a dead interface without setting the bond device down :\n"
-"         # ifenslave {-d|--detach} bond0 eth0 [eth1 [eth2]...]\n"
-"\n"
-"       To change active slave :\n"
-"         # ifenslave {-c|--change-active} bond0 eth0\n"
-"\n"
-"       To show master interface info\n"
-"         # ifenslave bond0\n"
-"\n"
-"       To show all interfaces info\n"
-"       # ifenslave {-a|--all-interfaces}\n"
-"\n"
-"       To be more verbose\n"
-"       # ifenslave {-v|--verbose} ...\n"
-"\n"
-"       # ifenslave {-u|--usage}   Show usage\n"
-"       # ifenslave {-V|--version} Show version\n"
-"       # ifenslave {-h|--help}    This message\n"
-"\n";
-
-#include <unistd.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <ctype.h>
-#include <string.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <getopt.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <sys/ioctl.h>
-#include <linux/if.h>
-#include <net/if_arp.h>
-#include <linux/if_ether.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 option longopts[] = {
-	/* { name  has_arg  *flag  val } */
-	{"all-interfaces",	0, 0, 'a'},	/* Show all interfaces. */
-	{"change-active",	0, 0, 'c'},	/* Change the active slave.  */
-	{"detach",		0, 0, 'd'},	/* Detach a slave interface. */
-	{"force",		0, 0, 'f'},	/* Force the operation. */
-	{"help",		0, 0, 'h'},	/* Give help */
-	{"usage",		0, 0, 'u'},	/* Give usage */
-	{"verbose",		0, 0, 'v'},	/* Report each action taken. */
-	{"version",		0, 0, 'V'},	/* Emit version information. */
-	{ 0, 0, 0, 0}
-};
-
-/* Command-line flags. */
-unsigned int
-opt_a = 0,	/* Show-all-interfaces flag. */
-opt_c = 0,	/* Change-active-slave flag. */
-opt_d = 0,	/* Detach a slave interface. */
-opt_f = 0,	/* Force the operation. */
-opt_h = 0,	/* Help */
-opt_u = 0,	/* Usage */
-opt_v = 0,	/* Verbose flag. */
-opt_V = 0;	/* Version */
-
-int skfd = -1;		/* AF_INET socket for ioctl() calls.*/
-int abi_ver = 0;	/* userland - kernel ABI version */
-int hwaddr_set = 0;	/* Master's hwaddr is set */
-int saved_errno;
-
-struct ifreq master_mtu, master_flags, master_hwaddr;
-struct ifreq slave_mtu, slave_flags, slave_hwaddr;
-
-struct dev_ifr {
-	struct ifreq *req_ifr;
-	char *req_name;
-	int req_type;
-};
-
-struct dev_ifr master_ifra[] = {
-	{&master_mtu,     "SIOCGIFMTU",     SIOCGIFMTU},
-	{&master_flags,   "SIOCGIFFLAGS",   SIOCGIFFLAGS},
-	{&master_hwaddr,  "SIOCGIFHWADDR",  SIOCGIFHWADDR},
-	{NULL, "", 0}
-};
-
-struct dev_ifr slave_ifra[] = {
-	{&slave_mtu,     "SIOCGIFMTU",     SIOCGIFMTU},
-	{&slave_flags,   "SIOCGIFFLAGS",   SIOCGIFFLAGS},
-	{&slave_hwaddr,  "SIOCGIFHWADDR",  SIOCGIFHWADDR},
-	{NULL, "", 0}
-};
-
-static void if_print(char *ifname);
-static int get_drv_info(char *master_ifname);
-static int get_if_settings(char *ifname, struct dev_ifr ifra[]);
-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 int 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);
-#define v_print(fmt, args...)	\
-	if (opt_v)		\
-		fprintf(stderr, fmt, ## args )
-
-int main(int argc, char *argv[])
-{
-	char **spp, *master_ifname, *slave_ifname;
-	int c, i, rv;
-	int res = 0;
-	int exclusive = 0;
-
-	while ((c = getopt_long(argc, argv, "acdfhuvV", longopts, 0)) != EOF) {
-		switch (c) {
-		case 'a': opt_a++; exclusive++; break;
-		case 'c': opt_c++; exclusive++; break;
-		case 'd': opt_d++; exclusive++; break;
-		case 'f': opt_f++; exclusive++; break;
-		case 'h': opt_h++; exclusive++; break;
-		case 'u': opt_u++; exclusive++; break;
-		case 'v': opt_v++; break;
-		case 'V': opt_V++; exclusive++; break;
-
-		case '?':
-			fprintf(stderr, "%s", usage_msg);
-			res = 2;
-			goto out;
-		}
-	}
-
-	/* options check */
-	if (exclusive > 1) {
-		fprintf(stderr, "%s", usage_msg);
-		res = 2;
-		goto out;
-	}
-
-	if (opt_v || opt_V) {
-		printf("%s", version);
-		if (opt_V) {
-			res = 0;
-			goto out;
-		}
-	}
-
-	if (opt_u) {
-		printf("%s", usage_msg);
-		res = 0;
-		goto out;
-	}
-
-	if (opt_h) {
-		printf("%s", usage_msg);
-		printf("%s", help_msg);
-		res = 0;
-		goto out;
-	}
-
-	/* Open a basic socket */
-	if ((skfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
-		perror("socket");
-		res = 1;
-		goto out;
-	}
-
-	if (opt_a) {
-		if (optind == argc) {
-			/* No remaining args */
-			/* show all interfaces */
-			if_print((char *)NULL);
-			goto out;
-		} else {
-			/* Just show usage */
-			fprintf(stderr, "%s", usage_msg);
-			res = 2;
-			goto out;
-		}
-	}
-
-	/* Copy the interface name */
-	spp = argv + optind;
-	master_ifname = *spp++;
-
-	if (master_ifname == NULL) {
-		fprintf(stderr, "%s", usage_msg);
-		res = 2;
-		goto out;
-	}
-
-	/* exchange abi version with bonding module */
-	res = get_drv_info(master_ifname);
-	if (res) {
-		fprintf(stderr,
-			"Master '%s': Error: handshake with driver failed. "
-			"Aborting\n",
-			master_ifname);
-		goto out;
-	}
-
-	slave_ifname = *spp++;
-
-	if (slave_ifname == NULL) {
-		if (opt_d || opt_c) {
-			fprintf(stderr, "%s", usage_msg);
-			res = 2;
-			goto out;
-		}
-
-		/* A single arg means show the
-		 * configuration for this interface
-		 */
-		if_print(master_ifname);
-		goto out;
-	}
-
-	res = get_if_settings(master_ifname, master_ifra);
-	if (res) {
-		/* Probably a good reason not to go on */
-		fprintf(stderr,
-			"Master '%s': Error: get settings failed: %s. "
-			"Aborting\n",
-			master_ifname, strerror(res));
-		goto out;
-	}
-
-	/* check if master is indeed a master;
-	 * if not then fail any operation
-	 */
-	if (!(master_flags.ifr_flags & IFF_MASTER)) {
-		fprintf(stderr,
-			"Illegal operation; the specified interface '%s' "
-			"is not a master. Aborting\n",
-			master_ifname);
-		res = 1;
-		goto out;
-	}
-
-	/* check if master is up; if not then fail any operation */
-	if (!(master_flags.ifr_flags & IFF_UP)) {
-		fprintf(stderr,
-			"Illegal operation; the specified master interface "
-			"'%s' is not up.\n",
-			master_ifname);
-		res = 1;
-		goto out;
-	}
-
-	/* Only for enslaving */
-	if (!opt_c && !opt_d) {
-		sa_family_t master_family = master_hwaddr.ifr_hwaddr.sa_family;
-		unsigned char *hwaddr =
-			(unsigned char *)master_hwaddr.ifr_hwaddr.sa_data;
-
-		/* The family '1' is ARPHRD_ETHER for ethernet. */
-		if (master_family != 1 && !opt_f) {
-			fprintf(stderr,
-				"Illegal operation: The specified master "
-				"interface '%s' is not ethernet-like.\n "
-				"This program is designed to work with "
-				"ethernet-like network interfaces.\n "
-				"Use the '-f' option to force the "
-				"operation.\n",
-				master_ifname);
-			res = 1;
-			goto out;
-		}
-
-		/* Check master's hw addr */
-		for (i = 0; i < 6; i++) {
-			if (hwaddr[i] != 0) {
-				hwaddr_set = 1;
-				break;
-			}
-		}
-
-		if (hwaddr_set) {
-			v_print("current hardware address of master '%s' "
-				"is %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x, "
-				"type %d\n",
-				master_ifname,
-				hwaddr[0], hwaddr[1],
-				hwaddr[2], hwaddr[3],
-				hwaddr[4], hwaddr[5],
-				master_family);
-		}
-	}
-
-	/* Accepts only one slave */
-	if (opt_c) {
-		/* change active slave */
-		res = get_slave_flags(slave_ifname);
-		if (res) {
-			fprintf(stderr,
-				"Slave '%s': Error: get flags failed. "
-				"Aborting\n",
-				slave_ifname);
-			goto out;
-		}
-		res = change_active(master_ifname, slave_ifname);
-		if (res) {
-			fprintf(stderr,
-				"Master '%s', Slave '%s': Error: "
-				"Change active failed\n",
-				master_ifname, slave_ifname);
-		}
-	} else {
-		/* Accept multiple slaves */
-		do {
-			if (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*/
-					fprintf(stderr,
-						"Slave '%s': Error: get flags "
-						"failed. Skipping\n",
-						slave_ifname);
-					res = rv;
-					continue;
-				}
-				rv = release(master_ifname, slave_ifname);
-				if (rv) {
-					fprintf(stderr,
-						"Master '%s', Slave '%s': Error: "
-						"Release failed\n",
-						master_ifname, slave_ifname);
-					res = rv;
-				}
-			} else {
-				/* attach a slave interface to the master */
-				rv = get_if_settings(slave_ifname, slave_ifra);
-				if (rv) {
-					/* Can't work with this slave. */
-					/* remember the error and skip it*/
-					fprintf(stderr,
-						"Slave '%s': Error: get "
-						"settings failed: %s. "
-						"Skipping\n",
-						slave_ifname, strerror(rv));
-					res = rv;
-					continue;
-				}
-				rv = enslave(master_ifname, slave_ifname);
-				if (rv) {
-					fprintf(stderr,
-						"Master '%s', Slave '%s': Error: "
-						"Enslave failed\n",
-						master_ifname, slave_ifname);
-					res = rv;
-				}
-			}
-		} while ((slave_ifname = *spp++) != NULL);
-	}
-
-out:
-	if (skfd >= 0) {
-		close(skfd);
-	}
-
-	return res;
-}
-
-static short mif_flags;
-
-/* Get the interface configuration from the kernel. */
-static int if_getconfig(char *ifname)
-{
-	struct ifreq ifr;
-	int metric, mtu;	/* Parameters of the master interface. */
-	struct sockaddr dstaddr, broadaddr, netmask;
-	unsigned char *hwaddr;
-
-	strcpy(ifr.ifr_name, ifname);
-	if (ioctl(skfd, SIOCGIFFLAGS, &ifr) < 0)
-		return -1;
-	mif_flags = ifr.ifr_flags;
-	printf("The result of SIOCGIFFLAGS on %s is %x.\n",
-	       ifname, ifr.ifr_flags);
-
-	strcpy(ifr.ifr_name, ifname);
-	if (ioctl(skfd, SIOCGIFADDR, &ifr) < 0)
-		return -1;
-	printf("The result of SIOCGIFADDR is %2.2x.%2.2x.%2.2x.%2.2x.\n",
-	       ifr.ifr_addr.sa_data[0], ifr.ifr_addr.sa_data[1],
-	       ifr.ifr_addr.sa_data[2], ifr.ifr_addr.sa_data[3]);
-
-	strcpy(ifr.ifr_name, ifname);
-	if (ioctl(skfd, SIOCGIFHWADDR, &ifr) < 0)
-		return -1;
-
-	/* Gotta convert from 'char' to unsigned for printf(). */
-	hwaddr = (unsigned char *)ifr.ifr_hwaddr.sa_data;
-	printf("The result of SIOCGIFHWADDR is type %d  "
-	       "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n",
-	       ifr.ifr_hwaddr.sa_family, hwaddr[0], hwaddr[1],
-	       hwaddr[2], hwaddr[3], hwaddr[4], hwaddr[5]);
-
-	strcpy(ifr.ifr_name, ifname);
-	if (ioctl(skfd, SIOCGIFMETRIC, &ifr) < 0) {
-		metric = 0;
-	} else
-		metric = ifr.ifr_metric;
-	printf("The result of SIOCGIFMETRIC is %d\n", metric);
-
-	strcpy(ifr.ifr_name, ifname);
-	if (ioctl(skfd, SIOCGIFMTU, &ifr) < 0)
-		mtu = 0;
-	else
-		mtu = ifr.ifr_mtu;
-	printf("The result of SIOCGIFMTU is %d\n", mtu);
-
-	strcpy(ifr.ifr_name, ifname);
-	if (ioctl(skfd, SIOCGIFDSTADDR, &ifr) < 0) {
-		memset(&dstaddr, 0, sizeof(struct sockaddr));
-	} else
-		dstaddr = ifr.ifr_dstaddr;
-
-	strcpy(ifr.ifr_name, ifname);
-	if (ioctl(skfd, SIOCGIFBRDADDR, &ifr) < 0) {
-		memset(&broadaddr, 0, sizeof(struct sockaddr));
-	} else
-		broadaddr = ifr.ifr_broadaddr;
-
-	strcpy(ifr.ifr_name, ifname);
-	if (ioctl(skfd, SIOCGIFNETMASK, &ifr) < 0) {
-		memset(&netmask, 0, sizeof(struct sockaddr));
-	} else
-		netmask = ifr.ifr_netmask;
-
-	return 0;
-}
-
-static void if_print(char *ifname)
-{
-	char buff[1024];
-	struct ifconf ifc;
-	struct ifreq *ifr;
-	int i;
-
-	if (ifname == (char *)NULL) {
-		ifc.ifc_len = sizeof(buff);
-		ifc.ifc_buf = buff;
-		if (ioctl(skfd, SIOCGIFCONF, &ifc) < 0) {
-			perror("SIOCGIFCONF failed");
-			return;
-		}
-
-		ifr = ifc.ifc_req;
-		for (i = ifc.ifc_len / sizeof(struct ifreq); --i >= 0; ifr++) {
-			if (if_getconfig(ifr->ifr_name) < 0) {
-				fprintf(stderr,
-					"%s: unknown interface.\n",
-					ifr->ifr_name);
-				continue;
-			}
-
-			if (((mif_flags & IFF_UP) == 0) && !opt_a) continue;
-			/*ife_print(&ife);*/
-		}
-	} else {
-		if (if_getconfig(ifname) < 0) {
-			fprintf(stderr,
-				"%s: unknown interface.\n", ifname);
-		}
-	}
-}
-
-static int get_drv_info(char *master_ifname)
-{
-	struct ifreq ifr;
-	struct ethtool_drvinfo info;
-	char *endptr;
-
-	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) {
-			goto out;
-		}
-
-		saved_errno = errno;
-		v_print("Master '%s': Error: get bonding info failed %s\n",
-			master_ifname, strerror(saved_errno));
-		return 1;
-	}
-
-	abi_ver = strtoul(info.fw_version, &endptr, 0);
-	if (*endptr) {
-                v_print("Master '%s': Error: got invalid string as an ABI "
-			"version from the bonding module\n",
-			master_ifname);
-		return 1;
-	}
-
-out:
-	v_print("ABI ver is %d\n", abi_ver);
-
-	return 0;
-}
-
-static int change_active(char *master_ifname, char *slave_ifname)
-{
-	struct ifreq ifr;
-	int res = 0;
-
-	if (!(slave_flags.ifr_flags & IFF_SLAVE)) {
-		fprintf(stderr,
-			"Illegal operation: The specified slave interface "
-			"'%s' is not a slave\n",
-			slave_ifname);
-		return 1;
-	}
-
-	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)) {
-		saved_errno = errno;
-		v_print("Master '%s': Error: SIOCBONDCHANGEACTIVE failed: "
-			"%s\n",
-			master_ifname, strerror(saved_errno));
-		res = 1;
-	}
-
-	return res;
-}
-
-static int enslave(char *master_ifname, char *slave_ifname)
-{
-	struct ifreq ifr;
-	int res = 0;
-
-	if (slave_flags.ifr_flags & IFF_SLAVE) {
-		fprintf(stderr,
-			"Illegal operation: The specified slave interface "
-			"'%s' is already a slave\n",
-			slave_ifname);
-		return 1;
-	}
-
-	res = set_if_down(slave_ifname, slave_flags.ifr_flags);
-	if (res) {
-		fprintf(stderr,
-			"Slave '%s': Error: bring interface down failed\n",
-			slave_ifname);
-		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.
-		 */
-		set_if_addr(master_ifname, slave_ifname);
-	} else {
-		res = clear_if_addr(slave_ifname);
-		if (res) {
-			fprintf(stderr,
-				"Slave '%s': Error: clear address failed\n",
-				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) {
-			fprintf(stderr,
-				"Slave '%s': Error: set MTU failed\n",
-				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) {
-				fprintf(stderr,
-					"Slave '%s': Error: set hw address "
-					"failed\n",
-					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) {
-				fprintf(stderr,
-					"Slave '%s': Error: bring interface "
-					"down failed\n",
-					slave_ifname);
-				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 its hwaddr
-			 */
-			res = set_if_down(master_ifname, master_flags.ifr_flags);
-			if (res) {
-				fprintf(stderr,
-					"Master '%s': Error: bring interface "
-					"down failed\n",
-					master_ifname);
-				goto undo_mtu;
-			}
-		}
-
-		res = set_master_hwaddr(master_ifname,
-					&(slave_hwaddr.ifr_hwaddr));
-		if (res) {
-			fprintf(stderr,
-				"Master '%s': Error: set hw address "
-				"failed\n",
-				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) {
-				fprintf(stderr,
-					"Master '%s': Error: bring interface "
-					"up failed\n",
-					master_ifname);
-				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)) {
-		saved_errno = errno;
-		v_print("Master '%s': Error: SIOCBONDENSLAVE failed: %s\n",
-			master_ifname, strerror(saved_errno));
-		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)) {
-		fprintf(stderr,
-			"Illegal operation: The specified slave interface "
-			"'%s' is not a slave\n",
-			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)) {
-		saved_errno = errno;
-		v_print("Master '%s': Error: SIOCBONDRELEASE failed: %s\n",
-			master_ifname, strerror(saved_errno));
-		return 1;
-	} else 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);
-		if (res) {
-			fprintf(stderr,
-				"Slave '%s': Error: bring interface "
-				"down failed\n",
-				slave_ifname);
-		}
-	}
-
-	/* set to default mtu */
-	set_slave_mtu(slave_ifname, 1500);
-
-	return res;
-}
-
-static int get_if_settings(char *ifname, struct dev_ifr ifra[])
-{
-	int i;
-	int res = 0;
-
-	for (i = 0; ifra[i].req_ifr; i++) {
-		strncpy(ifra[i].req_ifr->ifr_name, ifname, IFNAMSIZ);
-		res = ioctl(skfd, ifra[i].req_type, ifra[i].req_ifr);
-		if (res < 0) {
-			saved_errno = errno;
-			v_print("Interface '%s': Error: %s failed: %s\n",
-				ifname, ifra[i].req_name,
-				strerror(saved_errno));
-
-			return saved_errno;
-		}
-	}
-
-	return 0;
-}
-
-static int get_slave_flags(char *slave_ifname)
-{
-	int res = 0;
-
-	strncpy(slave_flags.ifr_name, slave_ifname, IFNAMSIZ);
-	res = ioctl(skfd, SIOCGIFFLAGS, &slave_flags);
-	if (res < 0) {
-		saved_errno = errno;
-		v_print("Slave '%s': Error: SIOCGIFFLAGS failed: %s\n",
-			slave_ifname, strerror(saved_errno));
-	} else {
-		v_print("Slave %s: flags %04X.\n",
-			slave_ifname, slave_flags.ifr_flags);
-	}
-
-	return res;
-}
-
-static int set_master_hwaddr(char *master_ifname, struct sockaddr *hwaddr)
-{
-	unsigned char *addr = (unsigned char *)hwaddr->sa_data;
-	struct ifreq ifr;
-	int res = 0;
-
-	strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
-	memcpy(&(ifr.ifr_hwaddr), hwaddr, sizeof(struct sockaddr));
-	res = ioctl(skfd, SIOCSIFHWADDR, &ifr);
-	if (res < 0) {
-		saved_errno = errno;
-		v_print("Master '%s': Error: SIOCSIFHWADDR failed: %s\n",
-			master_ifname, strerror(saved_errno));
-		return res;
-	} else {
-		v_print("Master '%s': hardware address set to "
-			"%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n",
-			master_ifname, addr[0], addr[1], addr[2],
-			addr[3], addr[4], addr[5]);
-	}
-
-	return res;
-}
-
-static int set_slave_hwaddr(char *slave_ifname, struct sockaddr *hwaddr)
-{
-	unsigned char *addr = (unsigned char *)hwaddr->sa_data;
-	struct ifreq ifr;
-	int res = 0;
-
-	strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ);
-	memcpy(&(ifr.ifr_hwaddr), hwaddr, sizeof(struct sockaddr));
-	res = ioctl(skfd, SIOCSIFHWADDR, &ifr);
-	if (res < 0) {
-		saved_errno = errno;
-
-		v_print("Slave '%s': Error: SIOCSIFHWADDR failed: %s\n",
-			slave_ifname, strerror(saved_errno));
-
-		if (saved_errno == EBUSY) {
-			v_print("  The device is busy: it must be idle "
-				"before running this command.\n");
-		} else if (saved_errno == EOPNOTSUPP) {
-			v_print("  The device does not support setting "
-				"the MAC address.\n"
-				"  Your kernel likely does not support slave "
-				"devices.\n");
-		} else if (saved_errno == EINVAL) {
-			v_print("  The device's address type does not match "
-				"the master's address type.\n");
-		}
-		return res;
-	} else {
-		v_print("Slave '%s': hardware address set to "
-			"%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n",
-			slave_ifname, addr[0], addr[1], addr[2],
-			addr[3], addr[4], addr[5]);
-	}
-
-	return res;
-}
-
-static int set_slave_mtu(char *slave_ifname, int mtu)
-{
-	struct ifreq ifr;
-	int res = 0;
-
-	ifr.ifr_mtu = mtu;
-	strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ);
-
-	res = ioctl(skfd, SIOCSIFMTU, &ifr);
-	if (res < 0) {
-		saved_errno = errno;
-		v_print("Slave '%s': Error: SIOCSIFMTU failed: %s\n",
-			slave_ifname, strerror(saved_errno));
-	} else {
-		v_print("Slave '%s': MTU set to %d.\n", slave_ifname, mtu);
-	}
-
-	return res;
-}
-
-static int set_if_flags(char *ifname, short flags)
-{
-	struct ifreq ifr;
-	int res = 0;
-
-	ifr.ifr_flags = flags;
-	strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
-
-	res = ioctl(skfd, SIOCSIFFLAGS, &ifr);
-	if (res < 0) {
-		saved_errno = errno;
-		v_print("Interface '%s': Error: SIOCSIFFLAGS failed: %s\n",
-			ifname, strerror(saved_errno));
-	} else {
-		v_print("Interface '%s': flags set to %04X.\n", ifname, flags);
-	}
-
-	return res;
-}
-
-static int set_if_up(char *ifname, short flags)
-{
-	return set_if_flags(ifname, flags | IFF_UP);
-}
-
-static int set_if_down(char *ifname, short flags)
-{
-	return set_if_flags(ifname, flags & ~IFF_UP);
-}
-
-static int clear_if_addr(char *ifname)
-{
-	struct ifreq ifr;
-	int res = 0;
-
-	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));
-
-	res = ioctl(skfd, SIOCSIFADDR, &ifr);
-	if (res < 0) {
-		saved_errno = errno;
-		v_print("Interface '%s': Error: SIOCSIFADDR failed: %s\n",
-			ifname, strerror(saved_errno));
-	} else {
-		v_print("Interface '%s': address cleared\n", ifname);
-	}
-
-	return res;
-}
-
-static int set_if_addr(char *master_ifname, char *slave_ifname)
-{
-	struct ifreq ifr;
-	int res;
-	unsigned char *ipaddr;
-	int i;
-	struct {
-		char *req_name;
-		char *desc;
-		int g_ioctl;
-		int s_ioctl;
-	} ifra[] = {
-		{"IFADDR", "addr", SIOCGIFADDR, SIOCSIFADDR},
-		{"DSTADDR", "destination addr", SIOCGIFDSTADDR, SIOCSIFDSTADDR},
-		{"BRDADDR", "broadcast addr", SIOCGIFBRDADDR, SIOCSIFBRDADDR},
-		{"NETMASK", "netmask", SIOCGIFNETMASK, SIOCSIFNETMASK},
-		{NULL, NULL, 0, 0},
-	};
-
-	for (i = 0; ifra[i].req_name; i++) {
-		strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
-		res = ioctl(skfd, ifra[i].g_ioctl, &ifr);
-		if (res < 0) {
-			int saved_errno = errno;
-
-			v_print("Interface '%s': Error: SIOCG%s failed: %s\n",
-				master_ifname, ifra[i].req_name,
-				strerror(saved_errno));
-
-			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) {
-			int saved_errno = errno;
-
-			v_print("Interface '%s': Error: SIOCS%s failed: %s\n",
-				slave_ifname, ifra[i].req_name,
-				strerror(saved_errno));
-
-		}
-
-		ipaddr = (unsigned char *)ifr.ifr_addr.sa_data;
-		v_print("Interface '%s': set IP %s to %d.%d.%d.%d\n",
-			slave_ifname, ifra[i].desc,
-			ipaddr[0], ipaddr[1], ipaddr[2], ipaddr[3]);
-	}
-
-	return 0;
-}
-
-/*
- * Local variables:
- *  version-control: t
- *  kept-new-versions: 5
- *  c-indent-level: 4
- *  c-basic-offset: 4
- *  tab-width: 4
- *  compile-command: "gcc -Wall -Wstrict-prototypes -O -I/usr/src/linux/include ifenslave.c -o ifenslave"
- * End:
- */
-