patch-2.4.15 linux/Documentation/networking/ifenslave.c

• Lines: 563
• Date: Wed Nov 7 14:39:36 2001
• Orig file: v2.4.14/linux/Documentation/networking/ifenslave.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.14/linux/Documentation/networking/ifenslave.c linux/Documentation/networking/ifenslave.c
@@ -0,0 +1,562 @@
+/* Mode: C;
+ * ifenslave.c: Configure network interfaces for parallel routing.
+ *
+ *	This program controls the Linux implementation of running multiple
+ *	network interfaces in parallel.
+ *
+ * Usage:	ifenslave [-v] master-interface < slave-interface [metric <N>] > ...
+ *
+ * Author:	Donald Becker <becker@cesdis.gsfc.nasa.gov>
+ *		Copyright 1994-1996 Donald Becker
+ *
+ *		This program is free software; you can redistribute it
+ *		and/or modify it under the terms of the GNU General Public
+ *		License as published by the Free Software Foundation.
+ *
+ *	The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O
+ *	Center of Excellence in Space Data and Information Sciences
+ *	   Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771
+ *
+ *  Changes :
+ *    - 2000/10/02 Willy Tarreau <willy at meta-x.org> :
+ *       - few fixes. Master's MAC address is now correctly taken from
+ *         the first device when not previously set ;
+ *       - detach support : call BOND_RELEASE to detach an enslaved interface.
+ *       - give a mini-howto from command-line help : # ifenslave -h
+ *
+ *    - 2001/02/16 Chad N. Tindel <ctindel at ieee dot org> :
+ *       - Master is now brought down before setting the MAC address.  In
+ *         the 2.4 kernel you can't change the MAC address while the device is
+ *         up because you get EBUSY.  
+ *
+ *    - 2001/09/13 Takao Indoh <indou dot takao at jp dot fujitsu dot com>
+ *       - Added the ability to change the active interface on a mode 1 bond
+ *         at runtime.
+ *
+ *    - 2001/10/23 Chad N. Tindel <ctindel at ieee dot org> :
+ *       - No longer set the MAC address of the master.  The bond device will
+ *         take care of this itself
+ *       - Try the SIOC*** versions of the bonding ioctls before using the
+ *         old versions
+ */
+
+static char *version =
+"ifenslave.c:v0.07 9/9/97  Donald Becker (becker@cesdis.gsfc.nasa.gov).\n"
+"detach support added on 2000/10/02 by Willy Tarreau (willy at meta-x.org).\n"
+"2.4 kernel support added on 2001/02/16 by Chad N. Tindel (ctindel at ieee dot org.\n";
+
+static const char *usage_msg =
+"Usage: ifenslave [-adfrvVh] <master-interface> < <slave-if> [metric <N>] > ...\n"
+"       ifenslave -c master-interface slave-if\n";
+
+static const char *howto_msg =
+"Usage: ifenslave [-adfrvVh] <master-interface> < <slave-if> [metric <N>] > ...\n"
+"       ifenslave -c master-interface slave-if\n"
+"\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 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"
+"\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 <linux/if_arp.h>
+#include <linux/if_ether.h>
+#include <linux/if_bonding.h>
+#include <linux/sockios.h>
+
+struct option longopts[] = {
+ /* { name  has_arg  *flag  val } */
+    {"all-interfaces", 0, 0, 'a'},	/* Show all interfaces. */
+    {"force",       0, 0, 'f'},		/* Force the operation. */
+    {"help", 		0, 0, '?'},		/* Give help */
+	{"howto",       0, 0, 'h'},     /* Give some more help */
+    {"receive-slave", 0, 0, 'r'},	/* Make a receive-only slave.  */
+    {"verbose", 	0, 0, 'v'},		/* Report each action taken.  */
+    {"version", 	0, 0, 'V'},		/* Emit version information.  */
+    {"detach",       0, 0, 'd'},	/* Detach a slave interface. */
+    {"change-active", 0, 0, 'c'},	/* Change the active slave.  */
+    { 0, 0, 0, 0 }
+};
+
+/* Command-line flags. */
+unsigned int
+opt_a = 0,					/* Show-all-interfaces flag. */
+opt_f = 0,					/* Force the operation. */
+opt_r = 0,					/* Set up a Rx-only slave. */
+opt_d = 0,					/* detach a slave interface. */
+opt_c = 0,					/* change-active-slave flag. */
+verbose = 0,					/* Verbose flag. */
+opt_version = 0,
+opt_howto = 0;
+int skfd = -1;					/* AF_INET socket for ioctl() calls.	*/
+
+static void if_print(char *ifname);
+
+int
+main(int argc, char **argv)
+{
+	struct ifreq  ifr2, if_hwaddr, if_ipaddr, if_metric, if_mtu, if_dstaddr;
+	struct ifreq  if_netmask, if_brdaddr, if_flags;
+	int goterr = 0;
+	int c, errflag = 0;
+	sa_family_t master_family;
+	char **spp, *master_ifname, *slave_ifname;
+	int hwaddr_notset;
+
+	while ((c = getopt_long(argc, argv, "acdfrvV?h", longopts, 0)) != EOF)
+		switch (c) {
+		case 'a': opt_a++; break;
+		case 'f': opt_f++; break;
+		case 'r': opt_r++; break;
+		case 'd': opt_d++; break;
+		case 'c': opt_c++; break;
+		case 'v': verbose++;		break;
+		case 'V': opt_version++;	break;
+		case 'h': opt_howto++;	break;
+		case '?': errflag++;
+		}
+
+	/* option check */
+	if (opt_c)
+		if(opt_a || opt_f || opt_r || opt_d || verbose || opt_version ||
+		   opt_howto || errflag ) {
+			fprintf(stderr, usage_msg);
+			return 2;
+		}
+
+	if (errflag) {
+		fprintf(stderr, usage_msg);
+		return 2;
+	}
+
+	if (opt_howto) {
+		fprintf(stderr, howto_msg);
+		return 0;
+	}
+
+	if (verbose || opt_version) {
+		printf(version);
+		if (opt_version)
+			exit(0);
+	}
+
+	/* Open a basic socket. */
+	if ((skfd = socket(AF_INET, SOCK_DGRAM,0)) < 0) {
+		perror("socket");
+		exit(-1);
+	}
+
+	if (verbose)
+		fprintf(stderr, "DEBUG: argc=%d, optind=%d and argv[optind] is %s.\n",
+				argc, optind, argv[optind]);
+
+	/* No remaining args means show all interfaces. */
+	if (optind == argc) {
+		if_print((char *)NULL);
+		(void) close(skfd);
+		exit(0);
+	}
+
+	/* Copy the interface name. */
+	spp = argv + optind;
+	master_ifname = *spp++;
+	slave_ifname = *spp++;
+
+	/* Check command line. */
+	if (opt_c) {
+		char **tempp = spp;
+		if ((master_ifname == NULL)||(slave_ifname == NULL)||(*tempp++ != NULL)) {
+			fprintf(stderr, usage_msg);
+			return 2;
+		}
+	}
+
+	/* A single args means show the configuration for this interface. */
+	if (slave_ifname == NULL) {
+		if_print(master_ifname);
+		(void) close(skfd);
+		exit(0);
+	}
+
+	/* Get the vitals from the master interface. */
+	{
+		struct ifreq *ifra[7] = { &if_ipaddr, &if_mtu, &if_dstaddr,
+								  &if_brdaddr, &if_netmask, &if_flags,
+								  &if_hwaddr };
+		const char *req_name[7] = {
+			"IP address", "MTU", "destination address",
+			"broadcast address", "netmask", "status flags",
+			"hardware address" };
+		const int ioctl_req_type[7] = {
+			SIOCGIFADDR, SIOCGIFMTU, SIOCGIFDSTADDR,
+			SIOCGIFBRDADDR, SIOCGIFNETMASK, SIOCGIFFLAGS,
+			SIOCGIFHWADDR };
+		int i;
+
+		for (i = 0; i < 7; i++) {
+			strncpy(ifra[i]->ifr_name, master_ifname, IFNAMSIZ);
+			if (ioctl(skfd, ioctl_req_type[i], ifra[i]) < 0) {
+				fprintf(stderr,
+						"Something broke getting the master's %s: %s.\n",
+						req_name[i], strerror(errno));
+			}
+		}
+
+		hwaddr_notset = 1; /* assume master's address not set yet */
+		for (i = 0; hwaddr_notset && (i < 6); i++) {
+			hwaddr_notset &= ((unsigned char *)if_hwaddr.ifr_hwaddr.sa_data)[i] == 0;
+		}
+
+		/* The family '1' is ARPHRD_ETHER for ethernet. */
+		if (if_hwaddr.ifr_hwaddr.sa_family != 1 && !opt_f) {
+			fprintf(stderr, "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);
+
+			exit (1);
+		}
+		master_family = if_hwaddr.ifr_hwaddr.sa_family;
+		if (verbose) {
+			unsigned char *hwaddr = (unsigned char *)if_hwaddr.ifr_hwaddr.sa_data;
+			printf("The current hardware address (SIOCGIFHWADDR) of %s is type %d  "
+				   "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n", master_ifname,
+				   if_hwaddr.ifr_hwaddr.sa_family, hwaddr[0], hwaddr[1],
+				   hwaddr[2], hwaddr[3], hwaddr[4], hwaddr[5]);
+		}
+	}
+
+
+	/* do this when enslaving interfaces */
+	do {
+		if (opt_d) {  /* detach a slave interface from the master */
+			strncpy(if_flags.ifr_name, master_ifname, IFNAMSIZ);
+			strncpy(if_flags.ifr_slave, slave_ifname, IFNAMSIZ);
+			if ((ioctl(skfd, SIOCBONDRELEASE, &if_flags) < 0) &&
+				(ioctl(skfd, BOND_RELEASE_OLD, &if_flags) < 0)) {
+					fprintf(stderr,	"SIOCBONDRELEASE: cannot detach %s from %s. errno=%s.\n",
+							slave_ifname, master_ifname, strerror(errno));
+			}
+			else {  /* we'll set the interface down to avoid any conflicts due to
+					   same IP/MAC */
+				strncpy(ifr2.ifr_name, slave_ifname, IFNAMSIZ);
+				if (ioctl(skfd, SIOCGIFFLAGS, &ifr2) < 0) {
+					int saved_errno = errno;
+					fprintf(stderr, "SIOCGIFFLAGS on %s failed: %s\n", slave_ifname,
+							strerror(saved_errno));
+				}
+				else {
+					ifr2.ifr_flags &= ~(IFF_UP | IFF_RUNNING);
+					if (ioctl(skfd, SIOCSIFFLAGS, &ifr2) < 0) {
+						int saved_errno = errno;
+						fprintf(stderr, "Shutting down interface %s failed: %s\n",
+								slave_ifname, strerror(saved_errno));
+					}
+				}
+			}
+		}
+		else {  /* attach a slave interface to the master */
+			/* two possibilities :
+			   - if hwaddr_notset, do nothing.  The bond will assign the
+			     hwaddr from it's first slave.
+			   - if !hwaddr_notset, assign the master's hwaddr to each slave
+			*/
+	
+			if (hwaddr_notset) { /* we do nothing */
+
+			}
+			else {  /* we'll assign master's hwaddr to this slave */
+				strncpy(ifr2.ifr_name, slave_ifname, IFNAMSIZ);
+				if (ioctl(skfd, SIOCGIFFLAGS, &ifr2) < 0) {
+					int saved_errno = errno;
+					fprintf(stderr, "SIOCGIFFLAGS on %s failed: %s\n", slave_ifname,
+							strerror(saved_errno));
+					return 1;
+				}
+	
+				if (ifr2.ifr_flags & IFF_UP) {
+					ifr2.ifr_flags &= ~IFF_UP;
+					if (ioctl(skfd, SIOCSIFFLAGS, &ifr2) < 0) {
+						int saved_errno = errno;
+						fprintf(stderr, "Shutting down interface %s failed: %s\n",
+								slave_ifname, strerror(saved_errno));
+					}
+				}
+	
+				strncpy(if_hwaddr.ifr_name, slave_ifname, IFNAMSIZ);
+				if (ioctl(skfd, SIOCSIFHWADDR, &if_hwaddr) < 0) {
+					int saved_errno = errno;
+					fprintf(stderr, "SIOCSIFHWADDR on %s failed: %s\n", if_hwaddr.ifr_name,
+							strerror(saved_errno));
+					if (saved_errno == EBUSY)
+						fprintf(stderr, "  The slave device %s is busy: it must be"
+								" idle before running this command.\n", slave_ifname);
+					else if (saved_errno == EOPNOTSUPP)
+						fprintf(stderr, "  The slave device you specified does not support"
+								" setting the MAC address.\n  Your kernel likely does not"
+								" support slave devices.\n");
+					else if (saved_errno == EINVAL)
+						fprintf(stderr, "  The slave device's address type does not match"
+								" the master's address type.\n");
+				} else {
+					if (verbose) {
+						unsigned char *hwaddr = if_hwaddr.ifr_hwaddr.sa_data;
+						printf("Slave's (%s) hardware address set to "
+							   "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n", slave_ifname,
+							   hwaddr[0], hwaddr[1], hwaddr[2], hwaddr[3], hwaddr[4], hwaddr[5]);
+					}
+				}
+			}
+	
+			if (*spp  &&  !strcmp(*spp, "metric")) {
+				if (*++spp == NULL) {
+					fprintf(stderr, usage_msg);
+					exit(2);
+				}
+				if_metric.ifr_metric = atoi(*spp);
+				strncpy(if_metric.ifr_name, slave_ifname, IFNAMSIZ);
+				if (ioctl(skfd, SIOCSIFMETRIC, &if_metric) < 0) {
+					fprintf(stderr, "SIOCSIFMETRIC on %s: %s\n", slave_ifname,
+							strerror(errno));
+					goterr = 1;
+				}
+				spp++;
+			}
+	
+			if (strncpy(if_ipaddr.ifr_name, slave_ifname, IFNAMSIZ) <= 0
+				|| ioctl(skfd, SIOCSIFADDR, &if_ipaddr) < 0) {
+				fprintf(stderr,
+						"Something broke setting the slave's address: %s.\n",
+						strerror(errno));
+			} else {
+				if (verbose) {
+					unsigned char *ipaddr = if_ipaddr.ifr_addr.sa_data;
+					printf("Set the slave's (%s) IP address to %d.%d.%d.%d.\n",
+						   slave_ifname, ipaddr[0], ipaddr[1], ipaddr[2], ipaddr[3]);
+				}
+			}
+	
+			if (strncpy(if_mtu.ifr_name, slave_ifname, IFNAMSIZ) <= 0
+				|| ioctl(skfd, SIOCSIFMTU, &if_mtu) < 0) { 
+				fprintf(stderr, "Something broke setting the slave MTU: %s.\n",
+						strerror(errno));
+			} else {
+				if (verbose)
+					printf("Set the slave's (%s) MTU to %d.\n", slave_ifname, if_mtu.ifr_mtu);
+			}
+	
+			if (strncpy(if_dstaddr.ifr_name, slave_ifname, IFNAMSIZ) <= 0
+				|| ioctl(skfd, SIOCSIFDSTADDR, &if_dstaddr) < 0) {
+				fprintf(stderr, "Error setting the slave (%s) with SIOCSIFDSTADDR: %s.\n",
+						slave_ifname, strerror(errno));
+			} else {
+				if (verbose) {
+					unsigned char *ipaddr = if_dstaddr.ifr_dstaddr.sa_data;
+					printf("Set the slave's (%s) destination address to %d.%d.%d.%d.\n",
+						   slave_ifname, ipaddr[0], ipaddr[1], ipaddr[2], ipaddr[3]);
+				}
+			}
+	
+			if (strncpy(if_brdaddr.ifr_name, slave_ifname, IFNAMSIZ) <= 0
+				|| ioctl(skfd, SIOCSIFBRDADDR, &if_brdaddr) < 0) {
+				fprintf(stderr,
+						"Something broke setting the slave (%s) broadcast address: %s.\n",
+						slave_ifname, strerror(errno));
+			} else {
+				if (verbose) {
+					unsigned char *ipaddr = if_brdaddr.ifr_broadaddr.sa_data;
+					printf("Set the slave's (%s) broadcast address to %d.%d.%d.%d.\n",
+						   slave_ifname, ipaddr[0], ipaddr[1], ipaddr[2], ipaddr[3]);
+				}
+			}
+			
+			if (strncpy(if_netmask.ifr_name, slave_ifname, IFNAMSIZ) <= 0
+				|| ioctl(skfd, SIOCSIFNETMASK, &if_netmask) < 0) {
+				fprintf(stderr,
+						"Something broke setting the slave (%s) netmask: %s.\n",
+						slave_ifname, strerror(errno));
+			} else {
+				if (verbose) {
+					unsigned char *ipaddr = if_netmask.ifr_netmask.sa_data;
+					printf("Set the slave's (%s) netmask to %d.%d.%d.%d.\n",
+						   slave_ifname, ipaddr[0], ipaddr[1], ipaddr[2], ipaddr[3]);
+				}
+			}
+			
+			ifr2.ifr_flags |= IFF_UP; /* the interface will need to be up to be bonded */
+			if ((ifr2.ifr_flags &= ~(IFF_SLAVE | IFF_MASTER)) == 0
+				|| strncpy(ifr2.ifr_name, slave_ifname, IFNAMSIZ) <= 0
+				|| ioctl(skfd, SIOCSIFFLAGS, &ifr2) < 0) {
+				fprintf(stderr,
+						"Something broke setting the slave (%s) flags: %s.\n",
+						slave_ifname, strerror(errno));
+			} else {
+				if (verbose)
+					printf("Set the slave's (%s) flags %4.4x.\n", slave_ifname, if_flags.ifr_flags);
+			}
+	
+			/* Do the real thing */
+			if ( ! opt_r) {
+				strncpy(if_flags.ifr_name, master_ifname, IFNAMSIZ);
+				strncpy(if_flags.ifr_slave, slave_ifname, IFNAMSIZ);
+				if (!opt_c) {
+					if ((ioctl(skfd, SIOCBONDENSLAVE, &if_flags) < 0) &&
+					    (ioctl(skfd, BOND_ENSLAVE_OLD, &if_flags) < 0)) {
+						fprintf(stderr,	"SIOCBONDENSLAVE: %s.\n", strerror(errno));
+					}
+				}
+				else {
+					if ((ioctl(skfd, SIOCBONDCHANGEACTIVE, &if_flags) < 0) &&
+					    (ioctl(skfd, BOND_CHANGE_ACTIVE_OLD, &if_flags) < 0)) {
+						fprintf(stderr,	"SIOCBONDCHANGEACTIVE: %s.\n", strerror(errno));
+					}
+				}
+			}
+		}
+	} while ( (slave_ifname = *spp++) != NULL);
+
+	/* Close the socket. */
+	(void) close(skfd);
+
+	return(goterr);
+}
+
+static short mif_flags;
+
+/* Get the inteface 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;
+
+	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().  */
+		unsigned char *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;
+
+	strcpy(ifr.ifr_name, ifname);
+	if (ioctl(skfd, SIOCGIFMTU, &ifr) < 0)
+		mtu = 0;
+	else
+		mtu = ifr.ifr_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) {
+			fprintf(stderr, "SIOCGIFCONF: %s\n", strerror(errno));
+			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);
+	}
+}
+
+
+/*
+ * 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:
+ */