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/Documentation/networking/ifenslave.c

https://bitbucket.org/evzijst/gittest
C | 1110 lines | 814 code | 126 blank | 170 comment | 122 complexity | f7cd5f072a16a84e940516ab74f76843 MD5 | raw file
   1/* Mode: C;
   2 * ifenslave.c: Configure network interfaces for parallel routing.
   3 *
   4 *	This program controls the Linux implementation of running multiple
   5 *	network interfaces in parallel.
   6 *
   7 * Author:	Donald Becker <becker@cesdis.gsfc.nasa.gov>
   8 *		Copyright 1994-1996 Donald Becker
   9 *
  10 *		This program is free software; you can redistribute it
  11 *		and/or modify it under the terms of the GNU General Public
  12 *		License as published by the Free Software Foundation.
  13 *
  14 *	The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O
  15 *	Center of Excellence in Space Data and Information Sciences
  16 *	   Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771
  17 *
  18 *  Changes :
  19 *    - 2000/10/02 Willy Tarreau <willy at meta-x.org> :
  20 *       - few fixes. Master's MAC address is now correctly taken from
  21 *         the first device when not previously set ;
  22 *       - detach support : call BOND_RELEASE to detach an enslaved interface.
  23 *       - give a mini-howto from command-line help : # ifenslave -h
  24 *
  25 *    - 2001/02/16 Chad N. Tindel <ctindel at ieee dot org> :
  26 *       - Master is now brought down before setting the MAC address.  In
  27 *         the 2.4 kernel you can't change the MAC address while the device is
  28 *         up because you get EBUSY.
  29 *
  30 *    - 2001/09/13 Takao Indoh <indou dot takao at jp dot fujitsu dot com>
  31 *       - Added the ability to change the active interface on a mode 1 bond
  32 *         at runtime.
  33 *
  34 *    - 2001/10/23 Chad N. Tindel <ctindel at ieee dot org> :
  35 *       - No longer set the MAC address of the master.  The bond device will
  36 *         take care of this itself
  37 *       - Try the SIOC*** versions of the bonding ioctls before using the
  38 *         old versions
  39 *    - 2002/02/18 Erik Habbinga <erik_habbinga @ hp dot com> :
  40 *       - ifr2.ifr_flags was not initialized in the hwaddr_notset case,
  41 *         SIOCGIFFLAGS now called before hwaddr_notset test
  42 *
  43 *    - 2002/10/31 Tony Cureington <tony.cureington * hp_com> :
  44 *       - If the master does not have a hardware address when the first slave
  45 *         is enslaved, the master is assigned the hardware address of that
  46 *         slave - there is a comment in bonding.c stating "ifenslave takes
  47 *         care of this now." This corrects the problem of slaves having
  48 *         different hardware addresses in active-backup mode when
  49 *         multiple interfaces are specified on a single ifenslave command
  50 *         (ifenslave bond0 eth0 eth1).
  51 *
  52 *    - 2003/03/18 - Tsippy Mendelson <tsippy.mendelson at intel dot com> and
  53 *                   Shmulik Hen <shmulik.hen at intel dot com>
  54 *       - Moved setting the slave's mac address and openning it, from
  55 *         the application to the driver. This enables support of modes
  56 *         that need to use the unique mac address of each slave.
  57 *         The driver also takes care of closing the slave and restoring its
  58 *         original mac address upon release.
  59 *         In addition, block possibility of enslaving before the master is up.
  60 *         This prevents putting the system in an undefined state.
  61 *
  62 *    - 2003/05/01 - Amir Noam <amir.noam at intel dot com>
  63 *       - Added ABI version control to restore compatibility between
  64 *         new/old ifenslave and new/old bonding.
  65 *       - Prevent adding an adapter that is already a slave.
  66 *         Fixes the problem of stalling the transmission and leaving
  67 *         the slave in a down state.
  68 *
  69 *    - 2003/05/01 - Shmulik Hen <shmulik.hen at intel dot com>
  70 *       - Prevent enslaving if the bond device is down.
  71 *         Fixes the problem of leaving the system in unstable state and
  72 *         halting when trying to remove the module.
  73 *       - Close socket on all abnormal exists.
  74 *       - Add versioning scheme that follows that of the bonding driver.
  75 *         current version is 1.0.0 as a base line.
  76 *
  77 *    - 2003/05/22 - Jay Vosburgh <fubar at us dot ibm dot com>
  78 *	 - ifenslave -c was broken; it's now fixed
  79 *	 - Fixed problem with routes vanishing from master during enslave
  80 *	   processing.
  81 *
  82 *    - 2003/05/27 - Amir Noam <amir.noam at intel dot com>
  83 *	 - Fix backward compatibility issues:
  84 *	   For drivers not using ABI versions, slave was set down while
  85 *	   it should be left up before enslaving.
  86 *	   Also, master was not set down and the default set_mac_address()
  87 *	   would fail and generate an error message in the system log.
  88 * 	 - For opt_c: slave should not be set to the master's setting
  89 *	   while it is running. It was already set during enslave. To
  90 *	   simplify things, it is now handeled separately.
  91 *
  92 *    - 2003/12/01 - Shmulik Hen <shmulik.hen at intel dot com>
  93 *	 - Code cleanup and style changes
  94 *	   set version to 1.1.0
  95 */
  96
  97#define APP_VERSION	"1.1.0"
  98#define APP_RELDATE	"December 1, 2003"
  99#define APP_NAME	"ifenslave"
 100
 101static char *version =
 102APP_NAME ".c:v" APP_VERSION " (" APP_RELDATE ")\n"
 103"o Donald Becker (becker@cesdis.gsfc.nasa.gov).\n"
 104"o Detach support added on 2000/10/02 by Willy Tarreau (willy at meta-x.org).\n"
 105"o 2.4 kernel support added on 2001/02/16 by Chad N. Tindel\n"
 106"  (ctindel at ieee dot org).\n";
 107
 108static const char *usage_msg =
 109"Usage: ifenslave [-f] <master-if> <slave-if> [<slave-if>...]\n"
 110"       ifenslave -d   <master-if> <slave-if> [<slave-if>...]\n"
 111"       ifenslave -c   <master-if> <slave-if>\n"
 112"       ifenslave --help\n";
 113
 114static const char *help_msg =
 115"\n"
 116"       To create a bond device, simply follow these three steps :\n"
 117"       - ensure that the required drivers are properly loaded :\n"
 118"         # modprobe bonding ; modprobe <3c59x|eepro100|pcnet32|tulip|...>\n"
 119"       - assign an IP address to the bond device :\n"
 120"         # ifconfig bond0 <addr> netmask <mask> broadcast <bcast>\n"
 121"       - attach all the interfaces you need to the bond device :\n"
 122"         # ifenslave [{-f|--force}] bond0 eth0 [eth1 [eth2]...]\n"
 123"         If bond0 didn't have a MAC address, it will take eth0's. Then, all\n"
 124"         interfaces attached AFTER this assignment will get the same MAC addr.\n"
 125"         (except for ALB/TLB modes)\n"
 126"\n"
 127"       To set the bond device down and automatically release all the slaves :\n"
 128"         # ifconfig bond0 down\n"
 129"\n"
 130"       To detach a dead interface without setting the bond device down :\n"
 131"         # ifenslave {-d|--detach} bond0 eth0 [eth1 [eth2]...]\n"
 132"\n"
 133"       To change active slave :\n"
 134"         # ifenslave {-c|--change-active} bond0 eth0\n"
 135"\n"
 136"       To show master interface info\n"
 137"         # ifenslave bond0\n"
 138"\n"
 139"       To show all interfaces info\n"
 140"       # ifenslave {-a|--all-interfaces}\n"
 141"\n"
 142"       To be more verbose\n"
 143"       # ifenslave {-v|--verbose} ...\n"
 144"\n"
 145"       # ifenslave {-u|--usage}   Show usage\n"
 146"       # ifenslave {-V|--version} Show version\n"
 147"       # ifenslave {-h|--help}    This message\n"
 148"\n";
 149
 150#include <unistd.h>
 151#include <stdlib.h>
 152#include <stdio.h>
 153#include <ctype.h>
 154#include <string.h>
 155#include <errno.h>
 156#include <fcntl.h>
 157#include <getopt.h>
 158#include <sys/types.h>
 159#include <sys/socket.h>
 160#include <sys/ioctl.h>
 161#include <linux/if.h>
 162#include <net/if_arp.h>
 163#include <linux/if_ether.h>
 164#include <linux/if_bonding.h>
 165#include <linux/sockios.h>
 166
 167typedef unsigned long long u64;	/* hack, so we may include kernel's ethtool.h */
 168typedef __uint32_t u32;		/* ditto */
 169typedef __uint16_t u16;		/* ditto */
 170typedef __uint8_t u8;		/* ditto */
 171#include <linux/ethtool.h>
 172
 173struct option longopts[] = {
 174	/* { name  has_arg  *flag  val } */
 175	{"all-interfaces",	0, 0, 'a'},	/* Show all interfaces. */
 176	{"change-active",	0, 0, 'c'},	/* Change the active slave.  */
 177	{"detach",		0, 0, 'd'},	/* Detach a slave interface. */
 178	{"force",		0, 0, 'f'},	/* Force the operation. */
 179	{"help",		0, 0, 'h'},	/* Give help */
 180	{"usage",		0, 0, 'u'},	/* Give usage */
 181	{"verbose",		0, 0, 'v'},	/* Report each action taken. */
 182	{"version",		0, 0, 'V'},	/* Emit version information. */
 183	{ 0, 0, 0, 0}
 184};
 185
 186/* Command-line flags. */
 187unsigned int
 188opt_a = 0,	/* Show-all-interfaces flag. */
 189opt_c = 0,	/* Change-active-slave flag. */
 190opt_d = 0,	/* Detach a slave interface. */
 191opt_f = 0,	/* Force the operation. */
 192opt_h = 0,	/* Help */
 193opt_u = 0,	/* Usage */
 194opt_v = 0,	/* Verbose flag. */
 195opt_V = 0;	/* Version */
 196
 197int skfd = -1;		/* AF_INET socket for ioctl() calls.*/
 198int abi_ver = 0;	/* userland - kernel ABI version */
 199int hwaddr_set = 0;	/* Master's hwaddr is set */
 200int saved_errno;
 201
 202struct ifreq master_mtu, master_flags, master_hwaddr;
 203struct ifreq slave_mtu, slave_flags, slave_hwaddr;
 204
 205struct dev_ifr {
 206	struct ifreq *req_ifr;
 207	char *req_name;
 208	int req_type;
 209};
 210
 211struct dev_ifr master_ifra[] = {
 212	{&master_mtu,     "SIOCGIFMTU",     SIOCGIFMTU},
 213	{&master_flags,   "SIOCGIFFLAGS",   SIOCGIFFLAGS},
 214	{&master_hwaddr,  "SIOCGIFHWADDR",  SIOCGIFHWADDR},
 215	{NULL, "", 0}
 216};
 217
 218struct dev_ifr slave_ifra[] = {
 219	{&slave_mtu,     "SIOCGIFMTU",     SIOCGIFMTU},
 220	{&slave_flags,   "SIOCGIFFLAGS",   SIOCGIFFLAGS},
 221	{&slave_hwaddr,  "SIOCGIFHWADDR",  SIOCGIFHWADDR},
 222	{NULL, "", 0}
 223};
 224
 225static void if_print(char *ifname);
 226static int get_drv_info(char *master_ifname);
 227static int get_if_settings(char *ifname, struct dev_ifr ifra[]);
 228static int get_slave_flags(char *slave_ifname);
 229static int set_master_hwaddr(char *master_ifname, struct sockaddr *hwaddr);
 230static int set_slave_hwaddr(char *slave_ifname, struct sockaddr *hwaddr);
 231static int set_slave_mtu(char *slave_ifname, int mtu);
 232static int set_if_flags(char *ifname, short flags);
 233static int set_if_up(char *ifname, short flags);
 234static int set_if_down(char *ifname, short flags);
 235static int clear_if_addr(char *ifname);
 236static int set_if_addr(char *master_ifname, char *slave_ifname);
 237static int change_active(char *master_ifname, char *slave_ifname);
 238static int enslave(char *master_ifname, char *slave_ifname);
 239static int release(char *master_ifname, char *slave_ifname);
 240#define v_print(fmt, args...)	\
 241	if (opt_v)		\
 242		fprintf(stderr, fmt, ## args )
 243
 244int main(int argc, char *argv[])
 245{
 246	char **spp, *master_ifname, *slave_ifname;
 247	int c, i, rv;
 248	int res = 0;
 249	int exclusive = 0;
 250
 251	while ((c = getopt_long(argc, argv, "acdfhuvV", longopts, 0)) != EOF) {
 252		switch (c) {
 253		case 'a': opt_a++; exclusive++; break;
 254		case 'c': opt_c++; exclusive++; break;
 255		case 'd': opt_d++; exclusive++; break;
 256		case 'f': opt_f++; exclusive++; break;
 257		case 'h': opt_h++; exclusive++; break;
 258		case 'u': opt_u++; exclusive++; break;
 259		case 'v': opt_v++; break;
 260		case 'V': opt_V++; exclusive++; break;
 261
 262		case '?':
 263			fprintf(stderr, usage_msg);
 264			res = 2;
 265			goto out;
 266		}
 267	}
 268
 269	/* options check */
 270	if (exclusive > 1) {
 271		fprintf(stderr, usage_msg);
 272		res = 2;
 273		goto out;
 274	}
 275
 276	if (opt_v || opt_V) {
 277		printf(version);
 278		if (opt_V) {
 279			res = 0;
 280			goto out;
 281		}
 282	}
 283
 284	if (opt_u) {
 285		printf(usage_msg);
 286		res = 0;
 287		goto out;
 288	}
 289
 290	if (opt_h) {
 291		printf(usage_msg);
 292		printf(help_msg);
 293		res = 0;
 294		goto out;
 295	}
 296
 297	/* Open a basic socket */
 298	if ((skfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
 299		perror("socket");
 300		res = 1;
 301		goto out;
 302	}
 303
 304	if (opt_a) {
 305		if (optind == argc) {
 306			/* No remaining args */
 307			/* show all interfaces */
 308			if_print((char *)NULL);
 309			goto out;
 310		} else {
 311			/* Just show usage */
 312			fprintf(stderr, usage_msg);
 313			res = 2;
 314			goto out;
 315		}
 316	}
 317
 318	/* Copy the interface name */
 319	spp = argv + optind;
 320	master_ifname = *spp++;
 321
 322	if (master_ifname == NULL) {
 323		fprintf(stderr, usage_msg);
 324		res = 2;
 325		goto out;
 326	}
 327
 328	/* exchange abi version with bonding module */
 329	res = get_drv_info(master_ifname);
 330	if (res) {
 331		fprintf(stderr,
 332			"Master '%s': Error: handshake with driver failed. "
 333			"Aborting\n",
 334			master_ifname);
 335		goto out;
 336	}
 337
 338	slave_ifname = *spp++;
 339
 340	if (slave_ifname == NULL) {
 341		if (opt_d || opt_c) {
 342			fprintf(stderr, usage_msg);
 343			res = 2;
 344			goto out;
 345		}
 346
 347		/* A single arg means show the
 348		 * configuration for this interface
 349		 */
 350		if_print(master_ifname);
 351		goto out;
 352	}
 353
 354	res = get_if_settings(master_ifname, master_ifra);
 355	if (res) {
 356		/* Probably a good reason not to go on */
 357		fprintf(stderr,
 358			"Master '%s': Error: get settings failed: %s. "
 359			"Aborting\n",
 360			master_ifname, strerror(res));
 361		goto out;
 362	}
 363
 364	/* check if master is indeed a master;
 365	 * if not then fail any operation
 366	 */
 367	if (!(master_flags.ifr_flags & IFF_MASTER)) {
 368		fprintf(stderr,
 369			"Illegal operation; the specified interface '%s' "
 370			"is not a master. Aborting\n",
 371			master_ifname);
 372		res = 1;
 373		goto out;
 374	}
 375
 376	/* check if master is up; if not then fail any operation */
 377	if (!(master_flags.ifr_flags & IFF_UP)) {
 378		fprintf(stderr,
 379			"Illegal operation; the specified master interface "
 380			"'%s' is not up.\n",
 381			master_ifname);
 382		res = 1;
 383		goto out;
 384	}
 385
 386	/* Only for enslaving */
 387	if (!opt_c && !opt_d) {
 388		sa_family_t master_family = master_hwaddr.ifr_hwaddr.sa_family;
 389		unsigned char *hwaddr =
 390			(unsigned char *)master_hwaddr.ifr_hwaddr.sa_data;
 391
 392		/* The family '1' is ARPHRD_ETHER for ethernet. */
 393		if (master_family != 1 && !opt_f) {
 394			fprintf(stderr,
 395				"Illegal operation: The specified master "
 396				"interface '%s' is not ethernet-like.\n "
 397				"This program is designed to work with "
 398				"ethernet-like network interfaces.\n "
 399				"Use the '-f' option to force the "
 400				"operation.\n",
 401				master_ifname);
 402			res = 1;
 403			goto out;
 404		}
 405
 406		/* Check master's hw addr */
 407		for (i = 0; i < 6; i++) {
 408			if (hwaddr[i] != 0) {
 409				hwaddr_set = 1;
 410				break;
 411			}
 412		}
 413
 414		if (hwaddr_set) {
 415			v_print("current hardware address of master '%s' "
 416				"is %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x, "
 417				"type %d\n",
 418				master_ifname,
 419				hwaddr[0], hwaddr[1],
 420				hwaddr[2], hwaddr[3],
 421				hwaddr[4], hwaddr[5],
 422				master_family);
 423		}
 424	}
 425
 426	/* Accepts only one slave */
 427	if (opt_c) {
 428		/* change active slave */
 429		res = get_slave_flags(slave_ifname);
 430		if (res) {
 431			fprintf(stderr,
 432				"Slave '%s': Error: get flags failed. "
 433				"Aborting\n",
 434				slave_ifname);
 435			goto out;
 436		}
 437		res = change_active(master_ifname, slave_ifname);
 438		if (res) {
 439			fprintf(stderr,
 440				"Master '%s', Slave '%s': Error: "
 441				"Change active failed\n",
 442				master_ifname, slave_ifname);
 443		}
 444	} else {
 445		/* Accept multiple slaves */
 446		do {
 447			if (opt_d) {
 448				/* detach a slave interface from the master */
 449				rv = get_slave_flags(slave_ifname);
 450				if (rv) {
 451					/* Can't work with this slave. */
 452					/* remember the error and skip it*/
 453					fprintf(stderr,
 454						"Slave '%s': Error: get flags "
 455						"failed. Skipping\n",
 456						slave_ifname);
 457					res = rv;
 458					continue;
 459				}
 460				rv = release(master_ifname, slave_ifname);
 461				if (rv) {
 462					fprintf(stderr,
 463						"Master '%s', Slave '%s': Error: "
 464						"Release failed\n",
 465						master_ifname, slave_ifname);
 466					res = rv;
 467				}
 468			} else {
 469				/* attach a slave interface to the master */
 470				rv = get_if_settings(slave_ifname, slave_ifra);
 471				if (rv) {
 472					/* Can't work with this slave. */
 473					/* remember the error and skip it*/
 474					fprintf(stderr,
 475						"Slave '%s': Error: get "
 476						"settings failed: %s. "
 477						"Skipping\n",
 478						slave_ifname, strerror(rv));
 479					res = rv;
 480					continue;
 481				}
 482				rv = enslave(master_ifname, slave_ifname);
 483				if (rv) {
 484					fprintf(stderr,
 485						"Master '%s', Slave '%s': Error: "
 486						"Enslave failed\n",
 487						master_ifname, slave_ifname);
 488					res = rv;
 489				}
 490			}
 491		} while ((slave_ifname = *spp++) != NULL);
 492	}
 493
 494out:
 495	if (skfd >= 0) {
 496		close(skfd);
 497	}
 498
 499	return res;
 500}
 501
 502static short mif_flags;
 503
 504/* Get the inteface configuration from the kernel. */
 505static int if_getconfig(char *ifname)
 506{
 507	struct ifreq ifr;
 508	int metric, mtu;	/* Parameters of the master interface. */
 509	struct sockaddr dstaddr, broadaddr, netmask;
 510	unsigned char *hwaddr;
 511
 512	strcpy(ifr.ifr_name, ifname);
 513	if (ioctl(skfd, SIOCGIFFLAGS, &ifr) < 0)
 514		return -1;
 515	mif_flags = ifr.ifr_flags;
 516	printf("The result of SIOCGIFFLAGS on %s is %x.\n",
 517	       ifname, ifr.ifr_flags);
 518
 519	strcpy(ifr.ifr_name, ifname);
 520	if (ioctl(skfd, SIOCGIFADDR, &ifr) < 0)
 521		return -1;
 522	printf("The result of SIOCGIFADDR is %2.2x.%2.2x.%2.2x.%2.2x.\n",
 523	       ifr.ifr_addr.sa_data[0], ifr.ifr_addr.sa_data[1],
 524	       ifr.ifr_addr.sa_data[2], ifr.ifr_addr.sa_data[3]);
 525
 526	strcpy(ifr.ifr_name, ifname);
 527	if (ioctl(skfd, SIOCGIFHWADDR, &ifr) < 0)
 528		return -1;
 529
 530	/* Gotta convert from 'char' to unsigned for printf(). */
 531	hwaddr = (unsigned char *)ifr.ifr_hwaddr.sa_data;
 532	printf("The result of SIOCGIFHWADDR is type %d  "
 533	       "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n",
 534	       ifr.ifr_hwaddr.sa_family, hwaddr[0], hwaddr[1],
 535	       hwaddr[2], hwaddr[3], hwaddr[4], hwaddr[5]);
 536
 537	strcpy(ifr.ifr_name, ifname);
 538	if (ioctl(skfd, SIOCGIFMETRIC, &ifr) < 0) {
 539		metric = 0;
 540	} else
 541		metric = ifr.ifr_metric;
 542
 543	strcpy(ifr.ifr_name, ifname);
 544	if (ioctl(skfd, SIOCGIFMTU, &ifr) < 0)
 545		mtu = 0;
 546	else
 547		mtu = ifr.ifr_mtu;
 548
 549	strcpy(ifr.ifr_name, ifname);
 550	if (ioctl(skfd, SIOCGIFDSTADDR, &ifr) < 0) {
 551		memset(&dstaddr, 0, sizeof(struct sockaddr));
 552	} else
 553		dstaddr = ifr.ifr_dstaddr;
 554
 555	strcpy(ifr.ifr_name, ifname);
 556	if (ioctl(skfd, SIOCGIFBRDADDR, &ifr) < 0) {
 557		memset(&broadaddr, 0, sizeof(struct sockaddr));
 558	} else
 559		broadaddr = ifr.ifr_broadaddr;
 560
 561	strcpy(ifr.ifr_name, ifname);
 562	if (ioctl(skfd, SIOCGIFNETMASK, &ifr) < 0) {
 563		memset(&netmask, 0, sizeof(struct sockaddr));
 564	} else
 565		netmask = ifr.ifr_netmask;
 566
 567	return 0;
 568}
 569
 570static void if_print(char *ifname)
 571{
 572	char buff[1024];
 573	struct ifconf ifc;
 574	struct ifreq *ifr;
 575	int i;
 576
 577	if (ifname == (char *)NULL) {
 578		ifc.ifc_len = sizeof(buff);
 579		ifc.ifc_buf = buff;
 580		if (ioctl(skfd, SIOCGIFCONF, &ifc) < 0) {
 581			perror("SIOCGIFCONF failed");
 582			return;
 583		}
 584
 585		ifr = ifc.ifc_req;
 586		for (i = ifc.ifc_len / sizeof(struct ifreq); --i >= 0; ifr++) {
 587			if (if_getconfig(ifr->ifr_name) < 0) {
 588				fprintf(stderr,
 589					"%s: unknown interface.\n",
 590					ifr->ifr_name);
 591				continue;
 592			}
 593
 594			if (((mif_flags & IFF_UP) == 0) && !opt_a) continue;
 595			/*ife_print(&ife);*/
 596		}
 597	} else {
 598		if (if_getconfig(ifname) < 0) {
 599			fprintf(stderr,
 600				"%s: unknown interface.\n", ifname);
 601		}
 602	}
 603}
 604
 605static int get_drv_info(char *master_ifname)
 606{
 607	struct ifreq ifr;
 608	struct ethtool_drvinfo info;
 609	char *endptr;
 610
 611	memset(&ifr, 0, sizeof(ifr));
 612	strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
 613	ifr.ifr_data = (caddr_t)&info;
 614
 615	info.cmd = ETHTOOL_GDRVINFO;
 616	strncpy(info.driver, "ifenslave", 32);
 617	snprintf(info.fw_version, 32, "%d", BOND_ABI_VERSION);
 618
 619	if (ioctl(skfd, SIOCETHTOOL, &ifr) < 0) {
 620		if (errno == EOPNOTSUPP) {
 621			goto out;
 622		}
 623
 624		saved_errno = errno;
 625		v_print("Master '%s': Error: get bonding info failed %s\n",
 626			master_ifname, strerror(saved_errno));
 627		return 1;
 628	}
 629
 630	abi_ver = strtoul(info.fw_version, &endptr, 0);
 631	if (*endptr) {
 632                v_print("Master '%s': Error: got invalid string as an ABI "
 633			"version from the bonding module\n",
 634			master_ifname);
 635		return 1;
 636	}
 637
 638out:
 639	v_print("ABI ver is %d\n", abi_ver);
 640
 641	return 0;
 642}
 643
 644static int change_active(char *master_ifname, char *slave_ifname)
 645{
 646	struct ifreq ifr;
 647	int res = 0;
 648
 649	if (!(slave_flags.ifr_flags & IFF_SLAVE)) {
 650		fprintf(stderr,
 651			"Illegal operation: The specified slave interface "
 652			"'%s' is not a slave\n",
 653			slave_ifname);
 654		return 1;
 655	}
 656
 657	strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
 658	strncpy(ifr.ifr_slave, slave_ifname, IFNAMSIZ);
 659	if ((ioctl(skfd, SIOCBONDCHANGEACTIVE, &ifr) < 0) &&
 660	    (ioctl(skfd, BOND_CHANGE_ACTIVE_OLD, &ifr) < 0)) {
 661		saved_errno = errno;
 662		v_print("Master '%s': Error: SIOCBONDCHANGEACTIVE failed: "
 663			"%s\n",
 664			master_ifname, strerror(saved_errno));
 665		res = 1;
 666	}
 667
 668	return res;
 669}
 670
 671static int enslave(char *master_ifname, char *slave_ifname)
 672{
 673	struct ifreq ifr;
 674	int res = 0;
 675
 676	if (slave_flags.ifr_flags & IFF_SLAVE) {
 677		fprintf(stderr,
 678			"Illegal operation: The specified slave interface "
 679			"'%s' is already a slave\n",
 680			slave_ifname);
 681		return 1;
 682	}
 683
 684	res = set_if_down(slave_ifname, slave_flags.ifr_flags);
 685	if (res) {
 686		fprintf(stderr,
 687			"Slave '%s': Error: bring interface down failed\n",
 688			slave_ifname);
 689		return res;
 690	}
 691
 692	if (abi_ver < 2) {
 693		/* Older bonding versions would panic if the slave has no IP
 694		 * address, so get the IP setting from the master.
 695		 */
 696		res = set_if_addr(master_ifname, slave_ifname);
 697		if (res) {
 698			fprintf(stderr,
 699				"Slave '%s': Error: set address failed\n",
 700				slave_ifname);
 701			return res;
 702		}
 703	} else {
 704		res = clear_if_addr(slave_ifname);
 705		if (res) {
 706			fprintf(stderr,
 707				"Slave '%s': Error: clear address failed\n",
 708				slave_ifname);
 709			return res;
 710		}
 711	}
 712
 713	if (master_mtu.ifr_mtu != slave_mtu.ifr_mtu) {
 714		res = set_slave_mtu(slave_ifname, master_mtu.ifr_mtu);
 715		if (res) {
 716			fprintf(stderr,
 717				"Slave '%s': Error: set MTU failed\n",
 718				slave_ifname);
 719			return res;
 720		}
 721	}
 722
 723	if (hwaddr_set) {
 724		/* Master already has an hwaddr
 725		 * so set it's hwaddr to the slave
 726		 */
 727		if (abi_ver < 1) {
 728			/* The driver is using an old ABI, so
 729			 * the application sets the slave's
 730			 * hwaddr
 731			 */
 732			res = set_slave_hwaddr(slave_ifname,
 733					       &(master_hwaddr.ifr_hwaddr));
 734			if (res) {
 735				fprintf(stderr,
 736					"Slave '%s': Error: set hw address "
 737					"failed\n",
 738					slave_ifname);
 739				goto undo_mtu;
 740			}
 741
 742			/* For old ABI the application needs to bring the
 743			 * slave back up
 744			 */
 745			res = set_if_up(slave_ifname, slave_flags.ifr_flags);
 746			if (res) {
 747				fprintf(stderr,
 748					"Slave '%s': Error: bring interface "
 749					"down failed\n",
 750					slave_ifname);
 751				goto undo_slave_mac;
 752			}
 753		}
 754		/* The driver is using a new ABI,
 755		 * so the driver takes care of setting
 756		 * the slave's hwaddr and bringing
 757		 * it up again
 758		 */
 759	} else {
 760		/* No hwaddr for master yet, so
 761		 * set the slave's hwaddr to it
 762		 */
 763		if (abi_ver < 1) {
 764			/* For old ABI, the master needs to be
 765			 * down before setting it's hwaddr
 766			 */
 767			res = set_if_down(master_ifname, master_flags.ifr_flags);
 768			if (res) {
 769				fprintf(stderr,
 770					"Master '%s': Error: bring interface "
 771					"down failed\n",
 772					master_ifname);
 773				goto undo_mtu;
 774			}
 775		}
 776
 777		res = set_master_hwaddr(master_ifname,
 778					&(slave_hwaddr.ifr_hwaddr));
 779		if (res) {
 780			fprintf(stderr,
 781				"Master '%s': Error: set hw address "
 782				"failed\n",
 783				master_ifname);
 784			goto undo_mtu;
 785		}
 786
 787		if (abi_ver < 1) {
 788			/* For old ABI, bring the master
 789			 * back up
 790			 */
 791			res = set_if_up(master_ifname, master_flags.ifr_flags);
 792			if (res) {
 793				fprintf(stderr,
 794					"Master '%s': Error: bring interface "
 795					"up failed\n",
 796					master_ifname);
 797				goto undo_master_mac;
 798			}
 799		}
 800
 801		hwaddr_set = 1;
 802	}
 803
 804	/* Do the real thing */
 805	strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
 806	strncpy(ifr.ifr_slave, slave_ifname, IFNAMSIZ);
 807	if ((ioctl(skfd, SIOCBONDENSLAVE, &ifr) < 0) &&
 808	    (ioctl(skfd, BOND_ENSLAVE_OLD, &ifr) < 0)) {
 809		saved_errno = errno;
 810		v_print("Master '%s': Error: SIOCBONDENSLAVE failed: %s\n",
 811			master_ifname, strerror(saved_errno));
 812		res = 1;
 813	}
 814
 815	if (res) {
 816		goto undo_master_mac;
 817	}
 818
 819	return 0;
 820
 821/* rollback (best effort) */
 822undo_master_mac:
 823	set_master_hwaddr(master_ifname, &(master_hwaddr.ifr_hwaddr));
 824	hwaddr_set = 0;
 825	goto undo_mtu;
 826undo_slave_mac:
 827	set_slave_hwaddr(slave_ifname, &(slave_hwaddr.ifr_hwaddr));
 828undo_mtu:
 829	set_slave_mtu(slave_ifname, slave_mtu.ifr_mtu);
 830	return res;
 831}
 832
 833static int release(char *master_ifname, char *slave_ifname)
 834{
 835	struct ifreq ifr;
 836	int res = 0;
 837
 838	if (!(slave_flags.ifr_flags & IFF_SLAVE)) {
 839		fprintf(stderr,
 840			"Illegal operation: The specified slave interface "
 841			"'%s' is not a slave\n",
 842			slave_ifname);
 843		return 1;
 844	}
 845
 846	strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
 847	strncpy(ifr.ifr_slave, slave_ifname, IFNAMSIZ);
 848	if ((ioctl(skfd, SIOCBONDRELEASE, &ifr) < 0) &&
 849	    (ioctl(skfd, BOND_RELEASE_OLD, &ifr) < 0)) {
 850		saved_errno = errno;
 851		v_print("Master '%s': Error: SIOCBONDRELEASE failed: %s\n",
 852			master_ifname, strerror(saved_errno));
 853		return 1;
 854	} else if (abi_ver < 1) {
 855		/* The driver is using an old ABI, so we'll set the interface
 856		 * down to avoid any conflicts due to same MAC/IP
 857		 */
 858		res = set_if_down(slave_ifname, slave_flags.ifr_flags);
 859		if (res) {
 860			fprintf(stderr,
 861				"Slave '%s': Error: bring interface "
 862				"down failed\n",
 863				slave_ifname);
 864		}
 865	}
 866
 867	/* set to default mtu */
 868	set_slave_mtu(slave_ifname, 1500);
 869
 870	return res;
 871}
 872
 873static int get_if_settings(char *ifname, struct dev_ifr ifra[])
 874{
 875	int i;
 876	int res = 0;
 877
 878	for (i = 0; ifra[i].req_ifr; i++) {
 879		strncpy(ifra[i].req_ifr->ifr_name, ifname, IFNAMSIZ);
 880		res = ioctl(skfd, ifra[i].req_type, ifra[i].req_ifr);
 881		if (res < 0) {
 882			saved_errno = errno;
 883			v_print("Interface '%s': Error: %s failed: %s\n",
 884				ifname, ifra[i].req_name,
 885				strerror(saved_errno));
 886
 887			return saved_errno;
 888		}
 889	}
 890
 891	return 0;
 892}
 893
 894static int get_slave_flags(char *slave_ifname)
 895{
 896	int res = 0;
 897
 898	strncpy(slave_flags.ifr_name, slave_ifname, IFNAMSIZ);
 899	res = ioctl(skfd, SIOCGIFFLAGS, &slave_flags);
 900	if (res < 0) {
 901		saved_errno = errno;
 902		v_print("Slave '%s': Error: SIOCGIFFLAGS failed: %s\n",
 903			slave_ifname, strerror(saved_errno));
 904	} else {
 905		v_print("Slave %s: flags %04X.\n",
 906			slave_ifname, slave_flags.ifr_flags);
 907	}
 908
 909	return res;
 910}
 911
 912static int set_master_hwaddr(char *master_ifname, struct sockaddr *hwaddr)
 913{
 914	unsigned char *addr = (unsigned char *)hwaddr->sa_data;
 915	struct ifreq ifr;
 916	int res = 0;
 917
 918	strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
 919	memcpy(&(ifr.ifr_hwaddr), hwaddr, sizeof(struct sockaddr));
 920	res = ioctl(skfd, SIOCSIFHWADDR, &ifr);
 921	if (res < 0) {
 922		saved_errno = errno;
 923		v_print("Master '%s': Error: SIOCSIFHWADDR failed: %s\n",
 924			master_ifname, strerror(saved_errno));
 925		return res;
 926	} else {
 927		v_print("Master '%s': hardware address set to "
 928			"%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n",
 929			master_ifname, addr[0], addr[1], addr[2],
 930			addr[3], addr[4], addr[5]);
 931	}
 932
 933	return res;
 934}
 935
 936static int set_slave_hwaddr(char *slave_ifname, struct sockaddr *hwaddr)
 937{
 938	unsigned char *addr = (unsigned char *)hwaddr->sa_data;
 939	struct ifreq ifr;
 940	int res = 0;
 941
 942	strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ);
 943	memcpy(&(ifr.ifr_hwaddr), hwaddr, sizeof(struct sockaddr));
 944	res = ioctl(skfd, SIOCSIFHWADDR, &ifr);
 945	if (res < 0) {
 946		saved_errno = errno;
 947
 948		v_print("Slave '%s': Error: SIOCSIFHWADDR failed: %s\n",
 949			slave_ifname, strerror(saved_errno));
 950
 951		if (saved_errno == EBUSY) {
 952			v_print("  The device is busy: it must be idle "
 953				"before running this command.\n");
 954		} else if (saved_errno == EOPNOTSUPP) {
 955			v_print("  The device does not support setting "
 956				"the MAC address.\n"
 957				"  Your kernel likely does not support slave "
 958				"devices.\n");
 959		} else if (saved_errno == EINVAL) {
 960			v_print("  The device's address type does not match "
 961				"the master's address type.\n");
 962		}
 963		return res;
 964	} else {
 965		v_print("Slave '%s': hardware address set to "
 966			"%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n",
 967			slave_ifname, addr[0], addr[1], addr[2],
 968			addr[3], addr[4], addr[5]);
 969	}
 970
 971	return res;
 972}
 973
 974static int set_slave_mtu(char *slave_ifname, int mtu)
 975{
 976	struct ifreq ifr;
 977	int res = 0;
 978
 979	ifr.ifr_mtu = mtu;
 980	strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ);
 981
 982	res = ioctl(skfd, SIOCSIFMTU, &ifr);
 983	if (res < 0) {
 984		saved_errno = errno;
 985		v_print("Slave '%s': Error: SIOCSIFMTU failed: %s\n",
 986			slave_ifname, strerror(saved_errno));
 987	} else {
 988		v_print("Slave '%s': MTU set to %d.\n", slave_ifname, mtu);
 989	}
 990
 991	return res;
 992}
 993
 994static int set_if_flags(char *ifname, short flags)
 995{
 996	struct ifreq ifr;
 997	int res = 0;
 998
 999	ifr.ifr_flags = flags;
1000	strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
1001
1002	res = ioctl(skfd, SIOCSIFFLAGS, &ifr);
1003	if (res < 0) {
1004		saved_errno = errno;
1005		v_print("Interface '%s': Error: SIOCSIFFLAGS failed: %s\n",
1006			ifname, strerror(saved_errno));
1007	} else {
1008		v_print("Interface '%s': flags set to %04X.\n", ifname, flags);
1009	}
1010
1011	return res;
1012}
1013
1014static int set_if_up(char *ifname, short flags)
1015{
1016	return set_if_flags(ifname, flags | IFF_UP);
1017}
1018
1019static int set_if_down(char *ifname, short flags)
1020{
1021	return set_if_flags(ifname, flags & ~IFF_UP);
1022}
1023
1024static int clear_if_addr(char *ifname)
1025{
1026	struct ifreq ifr;
1027	int res = 0;
1028
1029	strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
1030	ifr.ifr_addr.sa_family = AF_INET;
1031	memset(ifr.ifr_addr.sa_data, 0, sizeof(ifr.ifr_addr.sa_data));
1032
1033	res = ioctl(skfd, SIOCSIFADDR, &ifr);
1034	if (res < 0) {
1035		saved_errno = errno;
1036		v_print("Interface '%s': Error: SIOCSIFADDR failed: %s\n",
1037			ifname, strerror(saved_errno));
1038	} else {
1039		v_print("Interface '%s': address cleared\n", ifname);
1040	}
1041
1042	return res;
1043}
1044
1045static int set_if_addr(char *master_ifname, char *slave_ifname)
1046{
1047	struct ifreq ifr;
1048	int res;
1049	unsigned char *ipaddr;
1050	int i;
1051	struct {
1052		char *req_name;
1053		char *desc;
1054		int g_ioctl;
1055		int s_ioctl;
1056	} ifra[] = {
1057		{"IFADDR", "addr", SIOCGIFADDR, SIOCSIFADDR},
1058		{"DSTADDR", "destination addr", SIOCGIFDSTADDR, SIOCSIFDSTADDR},
1059		{"BRDADDR", "broadcast addr", SIOCGIFBRDADDR, SIOCSIFBRDADDR},
1060		{"NETMASK", "netmask", SIOCGIFNETMASK, SIOCSIFNETMASK},
1061		{NULL, NULL, 0, 0},
1062	};
1063
1064	for (i = 0; ifra[i].req_name; i++) {
1065		strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
1066		res = ioctl(skfd, ifra[i].g_ioctl, &ifr);
1067		if (res < 0) {
1068			int saved_errno = errno;
1069
1070			v_print("Interface '%s': Error: SIOCG%s failed: %s\n",
1071				master_ifname, ifra[i].req_name,
1072				strerror(saved_errno));
1073
1074			ifr.ifr_addr.sa_family = AF_INET;
1075			memset(ifr.ifr_addr.sa_data, 0,
1076			       sizeof(ifr.ifr_addr.sa_data));
1077		}
1078
1079		strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ);
1080		res = ioctl(skfd, ifra[i].s_ioctl, &ifr);
1081		if (res < 0) {
1082			int saved_errno = errno;
1083
1084			v_print("Interface '%s': Error: SIOCS%s failed: %s\n",
1085				slave_ifname, ifra[i].req_name,
1086				strerror(saved_errno));
1087
1088			return res;
1089		}
1090
1091		ipaddr = ifr.ifr_addr.sa_data;
1092		v_print("Interface '%s': set IP %s to %d.%d.%d.%d\n",
1093			slave_ifname, ifra[i].desc,
1094			ipaddr[0], ipaddr[1], ipaddr[2], ipaddr[3]);
1095	}
1096
1097	return 0;
1098}
1099
1100/*
1101 * Local variables:
1102 *  version-control: t
1103 *  kept-new-versions: 5
1104 *  c-indent-level: 4
1105 *  c-basic-offset: 4
1106 *  tab-width: 4
1107 *  compile-command: "gcc -Wall -Wstrict-prototypes -O -I/usr/src/linux/include ifenslave.c -o ifenslave"
1108 * End:
1109 */
1110