Documentation/networking/ifenslave.c

   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
 101 static char *version =
 102 APP_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
 108 static 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
 114 static 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
 167 typedef unsigned long long u64; /* hack, so we may include kernel's ethtool.h */
 168 typedef __uint32_t u32;         /* ditto */
 169 typedef __uint16_t u16;         /* ditto */
 170 typedef __uint8_t u8;           /* ditto */
 171 #include <linux/ethtool.h>
 172
 173 struct 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. */
 187 unsigned int
 188 opt_a = 0,      /* Show-all-interfaces flag. */
 189 opt_c = 0,      /* Change-active-slave flag. */
 190 opt_d = 0,      /* Detach a slave interface. */
 191 opt_f = 0,      /* Force the operation. */
 192 opt_h = 0,      /* Help */
 193 opt_u = 0,      /* Usage */
 194 opt_v = 0,      /* Verbose flag. */
 195 opt_V = 0;      /* Version */
 196
 197 int skfd = -1;          /* AF_INET socket for ioctl() calls.*/
 198 int abi_ver = 0;        /* userland - kernel ABI version */
 199 int hwaddr_set = 0;     /* Master's hwaddr is set */
 200 int saved_errno;
 201
 202 struct ifreq master_mtu, master_flags, master_hwaddr;
 203 struct ifreq slave_mtu, slave_flags, slave_hwaddr;
 204
 205 struct dev_ifr {
 206         struct ifreq *req_ifr;
 207         char *req_name;
 208         int req_type;
 209 };
 210
 211 struct dev_ifr master_ifra[] = {
 212         {&master_mtu,     "SIOCGIFMTU",     SIOCGIFMTU},
 213         {&master_flags,   "SIOCGIFFLAGS",   SIOCGIFFLAGS},
 214         {&master_hwaddr,  "SIOCGIFHWADDR",  SIOCGIFHWADDR},
 215         {NULL, "", 0}
 216 };
 217
 218 struct dev_ifr slave_ifra[] = {
 219         {&slave_mtu,     "SIOCGIFMTU",     SIOCGIFMTU},
 220         {&slave_flags,   "SIOCGIFFLAGS",   SIOCGIFFLAGS},
 221         {&slave_hwaddr,  "SIOCGIFHWADDR",  SIOCGIFHWADDR},
 222         {NULL, "", 0}
 223 };
 224
 225 static void if_print(char *ifname);
 226 static int get_drv_info(char *master_ifname);
 227 static int get_if_settings(char *ifname, struct dev_ifr ifra[]);
 228 static int get_slave_flags(char *slave_ifname);
 229 static int set_master_hwaddr(char *master_ifname, struct sockaddr *hwaddr);
 230 static int set_slave_hwaddr(char *slave_ifname, struct sockaddr *hwaddr);
 231 static int set_slave_mtu(char *slave_ifname, int mtu);
 232 static int set_if_flags(char *ifname, short flags);
 233 static int set_if_up(char *ifname, short flags);
 234 static int set_if_down(char *ifname, short flags);
 235 static int clear_if_addr(char *ifname);
 236 static int set_if_addr(char *master_ifname, char *slave_ifname);
 237 static int change_active(char *master_ifname, char *slave_ifname);
 238 static int enslave(char *master_ifname, char *slave_ifname);
 239 static int release(char *master_ifname, char *slave_ifname);
 240 #define v_print(fmt, args...)   \
 241         if (opt_v)              \
 242                 fprintf(stderr, fmt, ## args )
 243
 244 int 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
 494 out:
 495         if (skfd >= 0) {
 496                 close(skfd);
 497         }
 498
 499         return res;
 500 }
 501
 502 static short mif_flags;
 503
 504 /* Get the inteface configuration from the kernel. */
 505 static 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
 570 static 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
 605 static 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
 638 out:
 639         v_print("ABI ver is %d\n", abi_ver);
 640
 641         return 0;
 642 }
 643
 644 static 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
 671 static 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) */
 822 undo_master_mac:
 823         set_master_hwaddr(master_ifname, &(master_hwaddr.ifr_hwaddr));
 824         hwaddr_set = 0;
 825         goto undo_mtu;
 826 undo_slave_mac:
 827         set_slave_hwaddr(slave_ifname, &(slave_hwaddr.ifr_hwaddr));
 828 undo_mtu:
 829         set_slave_mtu(slave_ifname, slave_mtu.ifr_mtu);
 830         return res;
 831 }
 832
 833 static 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
 873 static 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
 894 static 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
 912 static 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
 936 static 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
 974 static 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
 994 static 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
1014 static int set_if_up(char *ifname, short flags)
1015 {
1016         return set_if_flags(ifname, flags | IFF_UP);
1017 }
1018
1019 static int set_if_down(char *ifname, short flags)
1020 {
1021         return set_if_flags(ifname, flags & ~IFF_UP);
1022 }
1023
1024 static 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
1045 static 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