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  * Usage:       ifenslave [-v] master-interface < slave-interface [metric <N>] > ...
   8  *
   9  * Author:      Donald Becker <becker@cesdis.gsfc.nasa.gov>
  10  *              Copyright 1994-1996 Donald Becker
  11  *
  12  *              This program is free software; you can redistribute it
  13  *              and/or modify it under the terms of the GNU General Public
  14  *              License as published by the Free Software Foundation.
  15  *
  16  *      The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O
  17  *      Center of Excellence in Space Data and Information Sciences
  18  *         Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771
  19  *
  20  *  Changes :
  21  *    - 2000/10/02 Willy Tarreau <willy at meta-x.org> :
  22  *       - few fixes. Master's MAC address is now correctly taken from
  23  *         the first device when not previously set ;
  24  *       - detach support : call BOND_RELEASE to detach an enslaved interface.
  25  *       - give a mini-howto from command-line help : # ifenslave -h
  26  *
  27  *    - 2001/02/16 Chad N. Tindel <ctindel at ieee dot org> :
  28  *       - Master is now brought down before setting the MAC address.  In
  29  *         the 2.4 kernel you can't change the MAC address while the device is
  30  *         up because you get EBUSY.
  31  *
  32  *    - 2001/09/13 Takao Indoh <indou dot takao at jp dot fujitsu dot com>
  33  *       - Added the ability to change the active interface on a mode 1 bond
  34  *         at runtime.
  35  *
  36  *    - 2001/10/23 Chad N. Tindel <ctindel at ieee dot org> :
  37  *       - No longer set the MAC address of the master.  The bond device will
  38  *         take care of this itself
  39  *       - Try the SIOC*** versions of the bonding ioctls before using the
  40  *         old versions
  41  *    - 2002/02/18 Erik Habbinga <erik_habbinga @ hp dot com> :
  42  *       - ifr2.ifr_flags was not initialized in the hwaddr_notset case,
  43  *         SIOCGIFFLAGS now called before hwaddr_notset test
  44  *
  45  *    - 2002/10/31 Tony Cureington <tony.cureington * hp_com> :
  46  *       - If the master does not have a hardware address when the first slave
  47  *         is enslaved, the master is assigned the hardware address of that
  48  *         slave - there is a comment in bonding.c stating "ifenslave takes
  49  *         care of this now." This corrects the problem of slaves having
  50  *         different hardware addresses in active-backup mode when
  51  *         multiple interfaces are specified on a single ifenslave command
  52  *         (ifenslave bond0 eth0 eth1).
  53  *
  54  */
  55
  56 static char *version =
  57 "ifenslave.c:v0.07 9/9/97  Donald Becker (becker@cesdis.gsfc.nasa.gov).\n"
  58 "detach support added on 2000/10/02 by Willy Tarreau (willy at meta-x.org).\n"
  59 "2.4 kernel support added on 2001/02/16 by Chad N. Tindel (ctindel at ieee dot org.\n";
  60
  61 static const char *usage_msg =
  62 "Usage: ifenslave [-adfrvVh] <master-interface> < <slave-if> [metric <N>] > ...\n"
  63 "       ifenslave -c master-interface slave-if\n";
  64
  65 static const char *howto_msg =
  66 "Usage: ifenslave [-adfrvVh] <master-interface> < <slave-if> [metric <N>] > ...\n"
  67 "       ifenslave -c master-interface slave-if\n"
  68 "\n"
  69 "       To create a bond device, simply follow these three steps :\n"
  70 "       - ensure that the required drivers are properly loaded :\n"
  71 "         # modprobe bonding ; modprobe <3c59x|eepro100|pcnet32|tulip|...>\n"
  72 "       - assign an IP address to the bond device :\n"
  73 "         # ifconfig bond0 <addr> netmask <mask> broadcast <bcast>\n"
  74 "       - attach all the interfaces you need to the bond device :\n"
  75 "         # ifenslave bond0 eth0 eth1 eth2\n"
  76 "         If bond0 didn't have a MAC address, it will take eth0's. Then, all\n"
  77 "         interfaces attached AFTER this assignment will get the same MAC addr.\n"
  78 "\n"
  79 "       To detach a dead interface without setting the bond device down :\n"
  80 "         # ifenslave -d bond0 eth1\n"
  81 "\n"
  82 "       To set the bond device down and automatically release all the slaves :\n"
  83 "         # ifconfig bond0 down\n"
  84 "\n"
  85 "       To change active slave :\n"
  86 "         # ifenslave -c bond0 eth0\n"
  87 "\n";
  88
  89 #include <unistd.h>
  90 #include <stdlib.h>
  91 #include <stdio.h>
  92 #include <ctype.h>
  93 #include <string.h>
  94 #include <errno.h>
  95 #include <fcntl.h>
  96 #include <getopt.h>
  97 #include <sys/types.h>
  98 #include <sys/socket.h>
  99 #include <sys/ioctl.h>
 100 #include <linux/if.h>
 101 #include <linux/if_arp.h>
 102 #include <linux/if_ether.h>
 103 #include <linux/if_bonding.h>
 104 #include <linux/sockios.h>
 105
 106 struct option longopts[] = {
 107  /* { name  has_arg  *flag  val } */
 108     {"all-interfaces", 0, 0, 'a'},      /* Show all interfaces. */
 109     {"force",       0, 0, 'f'},         /* Force the operation. */
 110     {"help",            0, 0, '?'},             /* Give help */
 111         {"howto",       0, 0, 'h'},     /* Give some more help */
 112     {"receive-slave", 0, 0, 'r'},       /* Make a receive-only slave.  */
 113     {"verbose",         0, 0, 'v'},             /* Report each action taken.  */
 114     {"version",         0, 0, 'V'},             /* Emit version information.  */
 115     {"detach",       0, 0, 'd'},        /* Detach a slave interface. */
 116     {"change-active", 0, 0, 'c'},       /* Change the active slave.  */
 117     { 0, 0, 0, 0 }
 118 };
 119
 120 /* Command-line flags. */
 121 unsigned int
 122 opt_a = 0,                                      /* Show-all-interfaces flag. */
 123 opt_f = 0,                                      /* Force the operation. */
 124 opt_r = 0,                                      /* Set up a Rx-only slave. */
 125 opt_d = 0,                                      /* detach a slave interface. */
 126 opt_c = 0,                                      /* change-active-slave flag. */
 127 verbose = 0,                                    /* Verbose flag. */
 128 opt_version = 0,
 129 opt_howto = 0;
 130 int skfd = -1;                                  /* AF_INET socket for ioctl() calls.    */
 131
 132 static void if_print(char *ifname);
 133
 134 int
 135 main(int argc, char **argv)
 136 {
 137         struct ifreq  ifr2, if_hwaddr, if_ipaddr, if_metric, if_mtu, if_dstaddr;
 138         struct ifreq  if_netmask, if_brdaddr, if_flags;
 139         int goterr = 0;
 140         int c, errflag = 0;
 141         sa_family_t master_family;
 142         char **spp, *master_ifname, *slave_ifname;
 143         int hwaddr_notset;
 144         int master_up;
 145
 146         while ((c = getopt_long(argc, argv, "acdfrvV?h", longopts, 0)) != EOF)
 147                 switch (c) {
 148                 case 'a': opt_a++; break;
 149                 case 'f': opt_f++; break;
 150                 case 'r': opt_r++; break;
 151                 case 'd': opt_d++; break;
 152                 case 'c': opt_c++; break;
 153                 case 'v': verbose++;            break;
 154                 case 'V': opt_version++;        break;
 155                 case 'h': opt_howto++;  break;
 156                 case '?': errflag++;
 157                 }
 158
 159         /* option check */
 160         if (opt_c)
 161                 if(opt_a || opt_f || opt_r || opt_d || verbose || opt_version ||
 162                    opt_howto || errflag ) {
 163                         fprintf(stderr, usage_msg);
 164                         return 2;
 165                 }
 166
 167         if (errflag) {
 168                 fprintf(stderr, usage_msg);
 169                 return 2;
 170         }
 171
 172         if (opt_howto) {
 173                 fprintf(stderr, howto_msg);
 174                 return 0;
 175         }
 176
 177         if (verbose || opt_version) {
 178                 printf(version);
 179                 if (opt_version)
 180                         exit(0);
 181         }
 182
 183         /* Open a basic socket. */
 184         if ((skfd = socket(AF_INET, SOCK_DGRAM,0)) < 0) {
 185                 perror("socket");
 186                 exit(-1);
 187         }
 188
 189         if (verbose)
 190                 fprintf(stderr, "DEBUG: argc=%d, optind=%d and argv[optind] is %s.\n",
 191                                 argc, optind, argv[optind]);
 192
 193         /* No remaining args means show all interfaces. */
 194         if (optind == argc) {
 195                 if_print((char *)NULL);
 196                 (void) close(skfd);
 197                 exit(0);
 198         }
 199
 200         /* Copy the interface name. */
 201         spp = argv + optind;
 202         master_ifname = *spp++;
 203         slave_ifname = *spp++;
 204
 205         /* Check command line. */
 206         if (opt_c) {
 207                 char **tempp = spp;
 208                 if ((master_ifname == NULL)||(slave_ifname == NULL)||(*tempp++ != NULL)) {
 209                         fprintf(stderr, usage_msg);
 210                         return 2;
 211                 }
 212         }
 213
 214         /* A single args means show the configuration for this interface. */
 215         if (slave_ifname == NULL) {
 216                 if_print(master_ifname);
 217                 (void) close(skfd);
 218                 exit(0);
 219         }
 220
 221         /* Get the vitals from the master interface. */
 222         {
 223                 struct ifreq *ifra[7] = { &if_ipaddr, &if_mtu, &if_dstaddr,
 224                                                                   &if_brdaddr, &if_netmask, &if_flags,
 225                                                                   &if_hwaddr };
 226                 const char *req_name[7] = {
 227                         "IP address", "MTU", "destination address",
 228                         "broadcast address", "netmask", "status flags",
 229                         "hardware address" };
 230                 const int ioctl_req_type[7] = {
 231                         SIOCGIFADDR, SIOCGIFMTU, SIOCGIFDSTADDR,
 232                         SIOCGIFBRDADDR, SIOCGIFNETMASK, SIOCGIFFLAGS,
 233                         SIOCGIFHWADDR };
 234                 int i;
 235
 236                 for (i = 0; i < 7; i++) {
 237                         strncpy(ifra[i]->ifr_name, master_ifname, IFNAMSIZ);
 238                         if (ioctl(skfd, ioctl_req_type[i], ifra[i]) < 0) {
 239                                 fprintf(stderr,
 240                                                 "Something broke getting the master's %s: %s.\n",
 241                                                 req_name[i], strerror(errno));
 242                         }
 243                 }
 244
 245                 hwaddr_notset = 1; /* assume master's address not set yet */
 246                 for (i = 0; hwaddr_notset && (i < 6); i++) {
 247                         hwaddr_notset &= ((unsigned char *)if_hwaddr.ifr_hwaddr.sa_data)[i] == 0;
 248                 }
 249
 250                 /* The family '1' is ARPHRD_ETHER for ethernet. */
 251                 if (if_hwaddr.ifr_hwaddr.sa_family != 1 && !opt_f) {
 252                         fprintf(stderr, "The specified master interface '%s' is not"
 253                                         " ethernet-like.\n  This program is designed to work"
 254                                         " with ethernet-like network interfaces.\n"
 255                                         " Use the '-f' option to force the operation.\n",
 256                                         master_ifname);
 257
 258                         exit (1);
 259                 }
 260                 master_family = if_hwaddr.ifr_hwaddr.sa_family;
 261                 if (verbose) {
 262                         unsigned char *hwaddr = (unsigned char *)if_hwaddr.ifr_hwaddr.sa_data;
 263                         printf("The current hardware address (SIOCGIFHWADDR) of %s is type %d  "
 264                                    "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n", master_ifname,
 265                                    if_hwaddr.ifr_hwaddr.sa_family, hwaddr[0], hwaddr[1],
 266                                    hwaddr[2], hwaddr[3], hwaddr[4], hwaddr[5]);
 267                 }
 268         }
 269
 270
 271         /* do this when enslaving interfaces */
 272         do {
 273                 if (opt_d) {  /* detach a slave interface from the master */
 274                         strncpy(if_flags.ifr_name, master_ifname, IFNAMSIZ);
 275                         strncpy(if_flags.ifr_slave, slave_ifname, IFNAMSIZ);
 276                         if ((ioctl(skfd, SIOCBONDRELEASE, &if_flags) < 0) &&
 277                                 (ioctl(skfd, BOND_RELEASE_OLD, &if_flags) < 0)) {
 278                                         fprintf(stderr, "SIOCBONDRELEASE: cannot detach %s from %s. errno=%s.\n",
 279                                                         slave_ifname, master_ifname, strerror(errno));
 280                         }
 281                         else {  /* we'll set the interface down to avoid any conflicts due to
 282                                            same IP/MAC */
 283                                 strncpy(ifr2.ifr_name, slave_ifname, IFNAMSIZ);
 284                                 if (ioctl(skfd, SIOCGIFFLAGS, &ifr2) < 0) {
 285                                         int saved_errno = errno;
 286                                         fprintf(stderr, "SIOCGIFFLAGS on %s failed: %s\n", slave_ifname,
 287                                                         strerror(saved_errno));
 288                                 }
 289                                 else {
 290                                         ifr2.ifr_flags &= ~(IFF_UP | IFF_RUNNING);
 291                                         if (ioctl(skfd, SIOCSIFFLAGS, &ifr2) < 0) {
 292                                                 int saved_errno = errno;
 293                                                 fprintf(stderr, "Shutting down interface %s failed: %s\n",
 294                                                                 slave_ifname, strerror(saved_errno));
 295                                         }
 296                                 }
 297                         }
 298                 }
 299                 else {  /* attach a slave interface to the master */
 300                         /* two possibilities :
 301                            - if hwaddr_notset, do nothing.  The bond will assign the
 302                              hwaddr from it's first slave.
 303                            - if !hwaddr_notset, assign the master's hwaddr to each slave
 304                         */
 305
 306                         strncpy(ifr2.ifr_name, slave_ifname, IFNAMSIZ);
 307                         if (ioctl(skfd, SIOCGIFFLAGS, &ifr2) < 0) {
 308                                 int saved_errno = errno;
 309                                 fprintf(stderr, "SIOCGIFFLAGS on %s failed: %s\n", slave_ifname,
 310                                                 strerror(saved_errno));
 311                                 return 1;
 312                         }
 313
 314                         if (hwaddr_notset) {
 315                                 /* assign the slave hw address to the
 316                                  * master since it currently does not
 317                                  * have one; otherwise, slaves may
 318                                  * have different hw addresses in
 319                                  * active-backup mode as seen when enslaving
 320                                  * using "ifenslave bond0 eth0 eth1" because
 321                                  * hwaddr_notset is set outside this loop.
 322                                  * TODO: put this and the "else" portion in
 323                                  *       a function.
 324                                  */
 325                                 goterr = 0;
 326                                 master_up = 0;
 327                                 if (if_flags.ifr_flags & IFF_UP) {
 328                                         if_flags.ifr_flags &= ~IFF_UP;
 329                                         if (ioctl(skfd, SIOCSIFFLAGS,
 330                                                         &if_flags) < 0) {
 331                                                 goterr = 1;
 332                                                 fprintf(stderr,
 333                                                         "Shutting down "
 334                                                         "interface %s failed: "
 335                                                         "%s\n",
 336                                                         master_ifname,
 337                                                         strerror(errno));
 338                                         } else {
 339                                                 /* we took the master down,
 340                                                  * so we must bring it up
 341                                                  */
 342                                                 master_up = 1;
 343                                         }
 344                                 }
 345
 346                                 if (!goterr) {
 347                                         /* get the slaves MAC address */
 348                                         strncpy(if_hwaddr.ifr_name,
 349                                                         slave_ifname, IFNAMSIZ);
 350                                         if (ioctl(skfd, SIOCGIFHWADDR,
 351                                                         &if_hwaddr) < 0) {
 352                                                 fprintf(stderr,
 353                                                         "Could not get MAC "
 354                                                         "address of %s: %s\n",
 355                                                         slave_ifname,
 356                                                         strerror(errno));
 357                                                 strncpy(if_hwaddr.ifr_name,
 358                                                         master_ifname,
 359                                                         IFNAMSIZ);
 360                                                 goterr=1;
 361                                         }
 362                                 }
 363
 364                                 if (!goterr) {
 365                                         strncpy(if_hwaddr.ifr_name,
 366                                                 master_ifname, IFNAMSIZ);
 367                                         if (ioctl(skfd, SIOCSIFHWADDR,
 368                                                         &if_hwaddr) < 0) {
 369                                                 fprintf(stderr,
 370                                                         "Could not set MAC "
 371                                                         "address of %s: %s\n",
 372                                                         master_ifname,
 373                                                         strerror(errno));
 374                                                 goterr=1;
 375                                         } else {
 376                                                 hwaddr_notset = 0;
 377                                         }
 378                                 }
 379
 380                                 if (master_up) {
 381                                         if_flags.ifr_flags |= IFF_UP;
 382                                         if (ioctl(skfd, SIOCSIFFLAGS,
 383                                                         &if_flags) < 0) {
 384                                                 fprintf(stderr,
 385                                                         "Bringing up interface "
 386                                                         "%s failed: %s\n",
 387                                                         master_ifname,
 388                                                         strerror(errno));
 389                                         }
 390                                 }
 391
 392                         } else {
 393                                 /* we'll assign master's hwaddr to this slave */
 394                                 if (ifr2.ifr_flags & IFF_UP) {
 395                                         ifr2.ifr_flags &= ~IFF_UP;
 396                                         if (ioctl(skfd, SIOCSIFFLAGS, &ifr2) < 0) {
 397                                                 int saved_errno = errno;
 398                                                 fprintf(stderr, "Shutting down interface %s failed: %s\n",
 399                                                                 slave_ifname, strerror(saved_errno));
 400                                         }
 401                                 }
 402
 403                                 strncpy(if_hwaddr.ifr_name, slave_ifname, IFNAMSIZ);
 404                                 if (ioctl(skfd, SIOCSIFHWADDR, &if_hwaddr) < 0) {
 405                                         int saved_errno = errno;
 406                                         fprintf(stderr, "SIOCSIFHWADDR on %s failed: %s\n", if_hwaddr.ifr_name,
 407                                                         strerror(saved_errno));
 408                                         if (saved_errno == EBUSY)
 409                                                 fprintf(stderr, "  The slave device %s is busy: it must be"
 410                                                                 " idle before running this command.\n", slave_ifname);
 411                                         else if (saved_errno == EOPNOTSUPP)
 412                                                 fprintf(stderr, "  The slave device you specified does not support"
 413                                                                 " setting the MAC address.\n  Your kernel likely does not"
 414                                                                 " support slave devices.\n");
 415                                         else if (saved_errno == EINVAL)
 416                                                 fprintf(stderr, "  The slave device's address type does not match"
 417                                                                 " the master's address type.\n");
 418                                 } else {
 419                                         if (verbose) {
 420                                                 unsigned char *hwaddr = if_hwaddr.ifr_hwaddr.sa_data;
 421                                                 printf("Slave's (%s) hardware address set to "
 422                                                            "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n", slave_ifname,
 423                                                            hwaddr[0], hwaddr[1], hwaddr[2], hwaddr[3], hwaddr[4], hwaddr[5]);
 424                                         }
 425                                 }
 426                         }
 427
 428                         if (*spp  &&  !strcmp(*spp, "metric")) {
 429                                 if (*++spp == NULL) {
 430                                         fprintf(stderr, usage_msg);
 431                                         exit(2);
 432                                 }
 433                                 if_metric.ifr_metric = atoi(*spp);
 434                                 strncpy(if_metric.ifr_name, slave_ifname, IFNAMSIZ);
 435                                 if (ioctl(skfd, SIOCSIFMETRIC, &if_metric) < 0) {
 436                                         fprintf(stderr, "SIOCSIFMETRIC on %s: %s\n", slave_ifname,
 437                                                         strerror(errno));
 438                                         goterr = 1;
 439                                 }
 440                                 spp++;
 441                         }
 442
 443                         if (strncpy(if_ipaddr.ifr_name, slave_ifname, IFNAMSIZ) <= 0
 444                                 || ioctl(skfd, SIOCSIFADDR, &if_ipaddr) < 0) {
 445                                 fprintf(stderr,
 446                                                 "Something broke setting the slave's address: %s.\n",
 447                                                 strerror(errno));
 448                         } else {
 449                                 if (verbose) {
 450                                         unsigned char *ipaddr = if_ipaddr.ifr_addr.sa_data;
 451                                         printf("Set the slave's (%s) IP address to %d.%d.%d.%d.\n",
 452                                                    slave_ifname, ipaddr[0], ipaddr[1], ipaddr[2], ipaddr[3]);
 453                                 }
 454                         }
 455
 456                         if (strncpy(if_mtu.ifr_name, slave_ifname, IFNAMSIZ) <= 0
 457                                 || ioctl(skfd, SIOCSIFMTU, &if_mtu) < 0) {
 458                                 fprintf(stderr, "Something broke setting the slave MTU: %s.\n",
 459                                                 strerror(errno));
 460                         } else {
 461                                 if (verbose)
 462                                         printf("Set the slave's (%s) MTU to %d.\n", slave_ifname, if_mtu.ifr_mtu);
 463                         }
 464
 465                         if (strncpy(if_dstaddr.ifr_name, slave_ifname, IFNAMSIZ) <= 0
 466                                 || ioctl(skfd, SIOCSIFDSTADDR, &if_dstaddr) < 0) {
 467                                 fprintf(stderr, "Error setting the slave (%s) with SIOCSIFDSTADDR: %s.\n",
 468                                                 slave_ifname, strerror(errno));
 469                         } else {
 470                                 if (verbose) {
 471                                         unsigned char *ipaddr = if_dstaddr.ifr_dstaddr.sa_data;
 472                                         printf("Set the slave's (%s) destination address to %d.%d.%d.%d.\n",
 473                                                    slave_ifname, ipaddr[0], ipaddr[1], ipaddr[2], ipaddr[3]);
 474                                 }
 475                         }
 476
 477                         if (strncpy(if_brdaddr.ifr_name, slave_ifname, IFNAMSIZ) <= 0
 478                                 || ioctl(skfd, SIOCSIFBRDADDR, &if_brdaddr) < 0) {
 479                                 fprintf(stderr,
 480                                                 "Something broke setting the slave (%s) broadcast address: %s.\n",
 481                                                 slave_ifname, strerror(errno));
 482                         } else {
 483                                 if (verbose) {
 484                                         unsigned char *ipaddr = if_brdaddr.ifr_broadaddr.sa_data;
 485                                         printf("Set the slave's (%s) broadcast address to %d.%d.%d.%d.\n",
 486                                                    slave_ifname, ipaddr[0], ipaddr[1], ipaddr[2], ipaddr[3]);
 487                                 }
 488                         }
 489
 490                         if (strncpy(if_netmask.ifr_name, slave_ifname, IFNAMSIZ) <= 0
 491                                 || ioctl(skfd, SIOCSIFNETMASK, &if_netmask) < 0) {
 492                                 fprintf(stderr,
 493                                                 "Something broke setting the slave (%s) netmask: %s.\n",
 494                                                 slave_ifname, strerror(errno));
 495                         } else {
 496                                 if (verbose) {
 497                                         unsigned char *ipaddr = if_netmask.ifr_netmask.sa_data;
 498                                         printf("Set the slave's (%s) netmask to %d.%d.%d.%d.\n",
 499                                                    slave_ifname, ipaddr[0], ipaddr[1], ipaddr[2], ipaddr[3]);
 500                                 }
 501                         }
 502
 503                         ifr2.ifr_flags |= IFF_UP; /* the interface will need to be up to be bonded */
 504                         if ((ifr2.ifr_flags &= ~(IFF_SLAVE | IFF_MASTER)) == 0
 505                                 || strncpy(ifr2.ifr_name, slave_ifname, IFNAMSIZ) <= 0
 506                                 || ioctl(skfd, SIOCSIFFLAGS, &ifr2) < 0) {
 507                                 fprintf(stderr,
 508                                                 "Something broke setting the slave (%s) flags: %s.\n",
 509                                                 slave_ifname, strerror(errno));
 510                         } else {
 511                                 if (verbose)
 512                                         printf("Set the slave's (%s) flags %4.4x.\n", slave_ifname, if_flags.ifr_flags);
 513                         }
 514
 515                         /* Do the real thing */
 516                         if ( ! opt_r) {
 517                                 strncpy(if_flags.ifr_name, master_ifname, IFNAMSIZ);
 518                                 strncpy(if_flags.ifr_slave, slave_ifname, IFNAMSIZ);
 519                                 if (!opt_c) {
 520                                         if ((ioctl(skfd, SIOCBONDENSLAVE, &if_flags) < 0) &&
 521                                             (ioctl(skfd, BOND_ENSLAVE_OLD, &if_flags) < 0)) {
 522                                                 fprintf(stderr, "SIOCBONDENSLAVE: %s.\n", strerror(errno));
 523                                         }
 524                                 }
 525                                 else {
 526                                         if ((ioctl(skfd, SIOCBONDCHANGEACTIVE, &if_flags) < 0) &&
 527                                             (ioctl(skfd, BOND_CHANGE_ACTIVE_OLD, &if_flags) < 0)) {
 528                                                 fprintf(stderr, "SIOCBONDCHANGEACTIVE: %s.\n", strerror(errno));
 529                                         }
 530                                 }
 531                         }
 532                 }
 533         } while ( (slave_ifname = *spp++) != NULL);
 534
 535         /* Close the socket. */
 536         (void) close(skfd);
 537
 538         return(goterr);
 539 }
 540
 541 static short mif_flags;
 542
 543 /* Get the inteface configuration from the kernel. */
 544 static int if_getconfig(char *ifname)
 545 {
 546         struct ifreq ifr;
 547         int metric, mtu;                        /* Parameters of the master interface. */
 548         struct sockaddr dstaddr, broadaddr, netmask;
 549
 550         strcpy(ifr.ifr_name, ifname);
 551         if (ioctl(skfd, SIOCGIFFLAGS, &ifr) < 0)
 552                 return -1;
 553         mif_flags = ifr.ifr_flags;
 554         printf("The result of SIOCGIFFLAGS on %s is %x.\n",
 555                    ifname, ifr.ifr_flags);
 556
 557         strcpy(ifr.ifr_name, ifname);
 558         if (ioctl(skfd, SIOCGIFADDR, &ifr) < 0)
 559                 return -1;
 560         printf("The result of SIOCGIFADDR is %2.2x.%2.2x.%2.2x.%2.2x.\n",
 561                    ifr.ifr_addr.sa_data[0], ifr.ifr_addr.sa_data[1],
 562                    ifr.ifr_addr.sa_data[2], ifr.ifr_addr.sa_data[3]);
 563
 564         strcpy(ifr.ifr_name, ifname);
 565         if (ioctl(skfd, SIOCGIFHWADDR, &ifr) < 0)
 566                 return -1;
 567
 568         {
 569                 /* Gotta convert from 'char' to unsigned for printf().  */
 570                 unsigned char *hwaddr = (unsigned char *)ifr.ifr_hwaddr.sa_data;
 571                 printf("The result of SIOCGIFHWADDR is type %d  "
 572                            "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n",
 573                            ifr.ifr_hwaddr.sa_family, hwaddr[0], hwaddr[1],
 574                            hwaddr[2], hwaddr[3], hwaddr[4], hwaddr[5]);
 575         }
 576
 577         strcpy(ifr.ifr_name, ifname);
 578         if (ioctl(skfd, SIOCGIFMETRIC, &ifr) < 0) {
 579                 metric = 0;
 580         } else
 581                 metric = ifr.ifr_metric;
 582
 583         strcpy(ifr.ifr_name, ifname);
 584         if (ioctl(skfd, SIOCGIFMTU, &ifr) < 0)
 585                 mtu = 0;
 586         else
 587                 mtu = ifr.ifr_mtu;
 588
 589         strcpy(ifr.ifr_name, ifname);
 590         if (ioctl(skfd, SIOCGIFDSTADDR, &ifr) < 0) {
 591                 memset(&dstaddr, 0, sizeof(struct sockaddr));
 592         } else
 593                 dstaddr = ifr.ifr_dstaddr;
 594
 595         strcpy(ifr.ifr_name, ifname);
 596         if (ioctl(skfd, SIOCGIFBRDADDR, &ifr) < 0) {
 597                 memset(&broadaddr, 0, sizeof(struct sockaddr));
 598         } else
 599                 broadaddr = ifr.ifr_broadaddr;
 600
 601         strcpy(ifr.ifr_name, ifname);
 602         if (ioctl(skfd, SIOCGIFNETMASK, &ifr) < 0) {
 603                 memset(&netmask, 0, sizeof(struct sockaddr));
 604         } else
 605                 netmask = ifr.ifr_netmask;
 606
 607         return(0);
 608 }
 609
 610 static void if_print(char *ifname)
 611 {
 612         char buff[1024];
 613         struct ifconf ifc;
 614         struct ifreq *ifr;
 615         int i;
 616
 617         if (ifname == (char *)NULL) {
 618                 ifc.ifc_len = sizeof(buff);
 619                 ifc.ifc_buf = buff;
 620                 if (ioctl(skfd, SIOCGIFCONF, &ifc) < 0) {
 621                         fprintf(stderr, "SIOCGIFCONF: %s\n", strerror(errno));
 622                         return;
 623                 }
 624
 625                 ifr = ifc.ifc_req;
 626                 for (i = ifc.ifc_len / sizeof(struct ifreq); --i >= 0; ifr++) {
 627                         if (if_getconfig(ifr->ifr_name) < 0) {
 628                                 fprintf(stderr, "%s: unknown interface.\n",
 629                                                 ifr->ifr_name);
 630                                 continue;
 631                         }
 632
 633                         if (((mif_flags & IFF_UP) == 0) && !opt_a) continue;
 634                         /*ife_print(&ife);*/
 635                 }
 636         } else {
 637                 if (if_getconfig(ifname) < 0)
 638                         fprintf(stderr, "%s: unknown interface.\n", ifname);
 639         }
 640 }
 641
 642 \f
 643 /*
 644  * Local variables:
 645  *  version-control: t
 646  *  kept-new-versions: 5
 647  *  c-indent-level: 4
 648  *  c-basic-offset: 4
 649  *  tab-width: 4
 650  *  compile-command: "gcc -Wall -Wstrict-prototypes -O -I/usr/src/linux/include ifenslave.c -o ifenslave"
 651  * End:
 652  */