drivers/net/bonding/bond_sysfs.c

   1 /*
   2  * Copyright(c) 2004-2005 Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  */
  22
  23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  24
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/device.h>
  28 #include <linux/sched.h>
  29 #include <linux/fs.h>
  30 #include <linux/types.h>
  31 #include <linux/string.h>
  32 #include <linux/netdevice.h>
  33 #include <linux/inetdevice.h>
  34 #include <linux/in.h>
  35 #include <linux/sysfs.h>
  36 #include <linux/ctype.h>
  37 #include <linux/inet.h>
  38 #include <linux/rtnetlink.h>
  39 #include <linux/etherdevice.h>
  40 #include <net/net_namespace.h>
  41 #include <net/netns/generic.h>
  42 #include <linux/nsproxy.h>
  43
  44 #include "bonding.h"
  45
  46 #define to_dev(obj)     container_of(obj, struct device, kobj)
  47 #define to_bond(cd)     ((struct bonding *)(netdev_priv(to_net_dev(cd))))
  48
  49 /*
  50  * "show" function for the bond_masters attribute.
  51  * The class parameter is ignored.
  52  */
  53 static ssize_t bonding_show_bonds(struct class *cls,
  54                                   struct class_attribute *attr,
  55                                   char *buf)
  56 {
  57         struct bond_net *bn =
  58                 container_of(attr, struct bond_net, class_attr_bonding_masters);
  59         int res = 0;
  60         struct bonding *bond;
  61
  62         rtnl_lock();
  63
  64         list_for_each_entry(bond, &bn->dev_list, bond_list) {
  65                 if (res > (PAGE_SIZE - IFNAMSIZ)) {
  66                         /* not enough space for another interface name */
  67                         if ((PAGE_SIZE - res) > 10)
  68                                 res = PAGE_SIZE - 10;
  69                         res += sprintf(buf + res, "++more++ ");
  70                         break;
  71                 }
  72                 res += sprintf(buf + res, "%s ", bond->dev->name);
  73         }
  74         if (res)
  75                 buf[res-1] = '\n'; /* eat the leftover space */
  76
  77         rtnl_unlock();
  78         return res;
  79 }
  80
  81 static struct net_device *bond_get_by_name(struct bond_net *bn, const char *ifname)
  82 {
  83         struct bonding *bond;
  84
  85         list_for_each_entry(bond, &bn->dev_list, bond_list) {
  86                 if (strncmp(bond->dev->name, ifname, IFNAMSIZ) == 0)
  87                         return bond->dev;
  88         }
  89         return NULL;
  90 }
  91
  92 /*
  93  * "store" function for the bond_masters attribute.  This is what
  94  * creates and deletes entire bonds.
  95  *
  96  * The class parameter is ignored.
  97  *
  98  */
  99
 100 static ssize_t bonding_store_bonds(struct class *cls,
 101                                    struct class_attribute *attr,
 102                                    const char *buffer, size_t count)
 103 {
 104         struct bond_net *bn =
 105                 container_of(attr, struct bond_net, class_attr_bonding_masters);
 106         char command[IFNAMSIZ + 1] = {0, };
 107         char *ifname;
 108         int rv, res = count;
 109
 110         sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
 111         ifname = command + 1;
 112         if ((strlen(command) <= 1) ||
 113             !dev_valid_name(ifname))
 114                 goto err_no_cmd;
 115
 116         if (command[0] == '+') {
 117                 pr_info("%s is being created...\n", ifname);
 118                 rv = bond_create(bn->net, ifname);
 119                 if (rv) {
 120                         if (rv == -EEXIST)
 121                                 pr_info("%s already exists.\n", ifname);
 122                         else
 123                                 pr_info("%s creation failed.\n", ifname);
 124                         res = rv;
 125                 }
 126         } else if (command[0] == '-') {
 127                 struct net_device *bond_dev;
 128
 129                 rtnl_lock();
 130                 bond_dev = bond_get_by_name(bn, ifname);
 131                 if (bond_dev) {
 132                         pr_info("%s is being deleted...\n", ifname);
 133                         unregister_netdevice(bond_dev);
 134                 } else {
 135                         pr_err("unable to delete non-existent %s\n", ifname);
 136                         res = -ENODEV;
 137                 }
 138                 rtnl_unlock();
 139         } else
 140                 goto err_no_cmd;
 141
 142         /* Always return either count or an error.  If you return 0, you'll
 143          * get called forever, which is bad.
 144          */
 145         return res;
 146
 147 err_no_cmd:
 148         pr_err("no command found in bonding_masters. Use +ifname or -ifname.\n");
 149         return -EPERM;
 150 }
 151
 152 /* class attribute for bond_masters file.  This ends up in /sys/class/net */
 153 static const struct class_attribute class_attr_bonding_masters = {
 154         .attr = {
 155                 .name = "bonding_masters",
 156                 .mode = S_IWUSR | S_IRUGO,
 157         },
 158         .show = bonding_show_bonds,
 159         .store = bonding_store_bonds,
 160 };
 161
 162 int bond_create_slave_symlinks(struct net_device *master,
 163                                struct net_device *slave)
 164 {
 165         char linkname[IFNAMSIZ+7];
 166         int ret = 0;
 167
 168         /* first, create a link from the slave back to the master */
 169         ret = sysfs_create_link(&(slave->dev.kobj), &(master->dev.kobj),
 170                                 "master");
 171         if (ret)
 172                 return ret;
 173         /* next, create a link from the master to the slave */
 174         sprintf(linkname, "slave_%s", slave->name);
 175         ret = sysfs_create_link(&(master->dev.kobj), &(slave->dev.kobj),
 176                                 linkname);
 177
 178         /* free the master link created earlier in case of error */
 179         if (ret)
 180                 sysfs_remove_link(&(slave->dev.kobj), "master");
 181
 182         return ret;
 183
 184 }
 185
 186 void bond_destroy_slave_symlinks(struct net_device *master,
 187                                  struct net_device *slave)
 188 {
 189         char linkname[IFNAMSIZ+7];
 190
 191         sysfs_remove_link(&(slave->dev.kobj), "master");
 192         sprintf(linkname, "slave_%s", slave->name);
 193         sysfs_remove_link(&(master->dev.kobj), linkname);
 194 }
 195
 196
 197 /*
 198  * Show the slaves in the current bond.
 199  */
 200 static ssize_t bonding_show_slaves(struct device *d,
 201                                    struct device_attribute *attr, char *buf)
 202 {
 203         struct bonding *bond = to_bond(d);
 204         struct slave *slave;
 205         int res = 0;
 206
 207         read_lock(&bond->lock);
 208         bond_for_each_slave(bond, slave) {
 209                 if (res > (PAGE_SIZE - IFNAMSIZ)) {
 210                         /* not enough space for another interface name */
 211                         if ((PAGE_SIZE - res) > 10)
 212                                 res = PAGE_SIZE - 10;
 213                         res += sprintf(buf + res, "++more++ ");
 214                         break;
 215                 }
 216                 res += sprintf(buf + res, "%s ", slave->dev->name);
 217         }
 218         read_unlock(&bond->lock);
 219         if (res)
 220                 buf[res-1] = '\n'; /* eat the leftover space */
 221
 222         return res;
 223 }
 224
 225 /*
 226  * Set the slaves in the current bond.
 227  * This is supposed to be only thin wrapper for bond_enslave and bond_release.
 228  * All hard work should be done there.
 229  */
 230 static ssize_t bonding_store_slaves(struct device *d,
 231                                     struct device_attribute *attr,
 232                                     const char *buffer, size_t count)
 233 {
 234         char command[IFNAMSIZ + 1] = { 0, };
 235         char *ifname;
 236         int res, ret = count;
 237         struct net_device *dev;
 238         struct bonding *bond = to_bond(d);
 239
 240         if (!rtnl_trylock())
 241                 return restart_syscall();
 242
 243         sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
 244         ifname = command + 1;
 245         if ((strlen(command) <= 1) ||
 246             !dev_valid_name(ifname))
 247                 goto err_no_cmd;
 248
 249         dev = __dev_get_by_name(dev_net(bond->dev), ifname);
 250         if (!dev) {
 251                 pr_info("%s: Interface %s does not exist!\n",
 252                         bond->dev->name, ifname);
 253                 ret = -ENODEV;
 254                 goto out;
 255         }
 256
 257         switch (command[0]) {
 258         case '+':
 259                 pr_info("%s: Adding slave %s.\n", bond->dev->name, dev->name);
 260                 res = bond_enslave(bond->dev, dev);
 261                 break;
 262
 263         case '-':
 264                 pr_info("%s: Removing slave %s.\n", bond->dev->name, dev->name);
 265                 res = bond_release(bond->dev, dev);
 266                 break;
 267
 268         default:
 269                 goto err_no_cmd;
 270         }
 271
 272         if (res)
 273                 ret = res;
 274         goto out;
 275
 276 err_no_cmd:
 277         pr_err("no command found in slaves file for bond %s. Use +ifname or -ifname.\n",
 278                bond->dev->name);
 279         ret = -EPERM;
 280
 281 out:
 282         rtnl_unlock();
 283         return ret;
 284 }
 285
 286 static DEVICE_ATTR(slaves, S_IRUGO | S_IWUSR, bonding_show_slaves,
 287                    bonding_store_slaves);
 288
 289 /*
 290  * Show and set the bonding mode.  The bond interface must be down to
 291  * change the mode.
 292  */
 293 static ssize_t bonding_show_mode(struct device *d,
 294                                  struct device_attribute *attr, char *buf)
 295 {
 296         struct bonding *bond = to_bond(d);
 297
 298         return sprintf(buf, "%s %d\n",
 299                         bond_mode_tbl[bond->params.mode].modename,
 300                         bond->params.mode);
 301 }
 302
 303 static ssize_t bonding_store_mode(struct device *d,
 304                                   struct device_attribute *attr,
 305                                   const char *buf, size_t count)
 306 {
 307         int new_value, ret = count;
 308         struct bonding *bond = to_bond(d);
 309
 310         if (!rtnl_trylock())
 311                 return restart_syscall();
 312
 313         if (bond->dev->flags & IFF_UP) {
 314                 pr_err("unable to update mode of %s because interface is up.\n",
 315                        bond->dev->name);
 316                 ret = -EPERM;
 317                 goto out;
 318         }
 319
 320         if (!list_empty(&bond->slave_list)) {
 321                 pr_err("unable to update mode of %s because it has slaves.\n",
 322                         bond->dev->name);
 323                 ret = -EPERM;
 324                 goto out;
 325         }
 326
 327         new_value = bond_parse_parm(buf, bond_mode_tbl);
 328         if (new_value < 0)  {
 329                 pr_err("%s: Ignoring invalid mode value %.*s.\n",
 330                        bond->dev->name, (int)strlen(buf) - 1, buf);
 331                 ret = -EINVAL;
 332                 goto out;
 333         }
 334         if ((new_value == BOND_MODE_ALB ||
 335              new_value == BOND_MODE_TLB) &&
 336             bond->params.arp_interval) {
 337                 pr_err("%s: %s mode is incompatible with arp monitoring.\n",
 338                        bond->dev->name, bond_mode_tbl[new_value].modename);
 339                 ret = -EINVAL;
 340                 goto out;
 341         }
 342
 343         /* don't cache arp_validate between modes */
 344         bond->params.arp_validate = BOND_ARP_VALIDATE_NONE;
 345         bond->params.mode = new_value;
 346         bond_set_mode_ops(bond, bond->params.mode);
 347         pr_info("%s: setting mode to %s (%d).\n",
 348                 bond->dev->name, bond_mode_tbl[new_value].modename,
 349                 new_value);
 350 out:
 351         rtnl_unlock();
 352         return ret;
 353 }
 354 static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
 355                    bonding_show_mode, bonding_store_mode);
 356
 357 /*
 358  * Show and set the bonding transmit hash method.
 359  */
 360 static ssize_t bonding_show_xmit_hash(struct device *d,
 361                                       struct device_attribute *attr,
 362                                       char *buf)
 363 {
 364         struct bonding *bond = to_bond(d);
 365
 366         return sprintf(buf, "%s %d\n",
 367                        xmit_hashtype_tbl[bond->params.xmit_policy].modename,
 368                        bond->params.xmit_policy);
 369 }
 370
 371 static ssize_t bonding_store_xmit_hash(struct device *d,
 372                                        struct device_attribute *attr,
 373                                        const char *buf, size_t count)
 374 {
 375         int new_value, ret = count;
 376         struct bonding *bond = to_bond(d);
 377
 378         new_value = bond_parse_parm(buf, xmit_hashtype_tbl);
 379         if (new_value < 0)  {
 380                 pr_err("%s: Ignoring invalid xmit hash policy value %.*s.\n",
 381                        bond->dev->name,
 382                        (int)strlen(buf) - 1, buf);
 383                 ret = -EINVAL;
 384         } else {
 385                 bond->params.xmit_policy = new_value;
 386                 bond_set_mode_ops(bond, bond->params.mode);
 387                 pr_info("%s: setting xmit hash policy to %s (%d).\n",
 388                         bond->dev->name,
 389                         xmit_hashtype_tbl[new_value].modename, new_value);
 390         }
 391
 392         return ret;
 393 }
 394 static DEVICE_ATTR(xmit_hash_policy, S_IRUGO | S_IWUSR,
 395                    bonding_show_xmit_hash, bonding_store_xmit_hash);
 396
 397 /*
 398  * Show and set arp_validate.
 399  */
 400 static ssize_t bonding_show_arp_validate(struct device *d,
 401                                          struct device_attribute *attr,
 402                                          char *buf)
 403 {
 404         struct bonding *bond = to_bond(d);
 405
 406         return sprintf(buf, "%s %d\n",
 407                        arp_validate_tbl[bond->params.arp_validate].modename,
 408                        bond->params.arp_validate);
 409 }
 410
 411 static ssize_t bonding_store_arp_validate(struct device *d,
 412                                           struct device_attribute *attr,
 413                                           const char *buf, size_t count)
 414 {
 415         struct bonding *bond = to_bond(d);
 416         int new_value, ret = count;
 417
 418         if (!rtnl_trylock())
 419                 return restart_syscall();
 420         new_value = bond_parse_parm(buf, arp_validate_tbl);
 421         if (new_value < 0) {
 422                 pr_err("%s: Ignoring invalid arp_validate value %s\n",
 423                        bond->dev->name, buf);
 424                 ret = -EINVAL;
 425                 goto out;
 426         }
 427         if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
 428                 pr_err("%s: arp_validate only supported in active-backup mode.\n",
 429                        bond->dev->name);
 430                 ret = -EINVAL;
 431                 goto out;
 432         }
 433         pr_info("%s: setting arp_validate to %s (%d).\n",
 434                 bond->dev->name, arp_validate_tbl[new_value].modename,
 435                 new_value);
 436
 437         if (bond->dev->flags & IFF_UP) {
 438                 if (!new_value)
 439                         bond->recv_probe = NULL;
 440                 else if (bond->params.arp_interval)
 441                         bond->recv_probe = bond_arp_rcv;
 442         }
 443         bond->params.arp_validate = new_value;
 444 out:
 445         rtnl_unlock();
 446
 447         return ret;
 448 }
 449
 450 static DEVICE_ATTR(arp_validate, S_IRUGO | S_IWUSR, bonding_show_arp_validate,
 451                    bonding_store_arp_validate);
 452 /*
 453  * Show and set arp_all_targets.
 454  */
 455 static ssize_t bonding_show_arp_all_targets(struct device *d,
 456                                          struct device_attribute *attr,
 457                                          char *buf)
 458 {
 459         struct bonding *bond = to_bond(d);
 460         int value = bond->params.arp_all_targets;
 461
 462         return sprintf(buf, "%s %d\n", arp_all_targets_tbl[value].modename,
 463                        value);
 464 }
 465
 466 static ssize_t bonding_store_arp_all_targets(struct device *d,
 467                                           struct device_attribute *attr,
 468                                           const char *buf, size_t count)
 469 {
 470         struct bonding *bond = to_bond(d);
 471         int new_value;
 472
 473         new_value = bond_parse_parm(buf, arp_all_targets_tbl);
 474         if (new_value < 0) {
 475                 pr_err("%s: Ignoring invalid arp_all_targets value %s\n",
 476                        bond->dev->name, buf);
 477                 return -EINVAL;
 478         }
 479         pr_info("%s: setting arp_all_targets to %s (%d).\n",
 480                 bond->dev->name, arp_all_targets_tbl[new_value].modename,
 481                 new_value);
 482
 483         bond->params.arp_all_targets = new_value;
 484
 485         return count;
 486 }
 487
 488 static DEVICE_ATTR(arp_all_targets, S_IRUGO | S_IWUSR,
 489                    bonding_show_arp_all_targets, bonding_store_arp_all_targets);
 490
 491 /*
 492  * Show and store fail_over_mac.  User only allowed to change the
 493  * value when there are no slaves.
 494  */
 495 static ssize_t bonding_show_fail_over_mac(struct device *d,
 496                                           struct device_attribute *attr,
 497                                           char *buf)
 498 {
 499         struct bonding *bond = to_bond(d);
 500
 501         return sprintf(buf, "%s %d\n",
 502                        fail_over_mac_tbl[bond->params.fail_over_mac].modename,
 503                        bond->params.fail_over_mac);
 504 }
 505
 506 static ssize_t bonding_store_fail_over_mac(struct device *d,
 507                                            struct device_attribute *attr,
 508                                            const char *buf, size_t count)
 509 {
 510         int new_value, ret = count;
 511         struct bonding *bond = to_bond(d);
 512
 513         if (!rtnl_trylock())
 514                 return restart_syscall();
 515
 516         if (!list_empty(&bond->slave_list)) {
 517                 pr_err("%s: Can't alter fail_over_mac with slaves in bond.\n",
 518                        bond->dev->name);
 519                 ret = -EPERM;
 520                 goto out;
 521         }
 522
 523         new_value = bond_parse_parm(buf, fail_over_mac_tbl);
 524         if (new_value < 0) {
 525                 pr_err("%s: Ignoring invalid fail_over_mac value %s.\n",
 526                        bond->dev->name, buf);
 527                 ret = -EINVAL;
 528                 goto out;
 529         }
 530
 531         bond->params.fail_over_mac = new_value;
 532         pr_info("%s: Setting fail_over_mac to %s (%d).\n",
 533                 bond->dev->name, fail_over_mac_tbl[new_value].modename,
 534                 new_value);
 535
 536 out:
 537         rtnl_unlock();
 538         return ret;
 539 }
 540
 541 static DEVICE_ATTR(fail_over_mac, S_IRUGO | S_IWUSR,
 542                    bonding_show_fail_over_mac, bonding_store_fail_over_mac);
 543
 544 /*
 545  * Show and set the arp timer interval.  There are two tricky bits
 546  * here.  First, if ARP monitoring is activated, then we must disable
 547  * MII monitoring.  Second, if the ARP timer isn't running, we must
 548  * start it.
 549  */
 550 static ssize_t bonding_show_arp_interval(struct device *d,
 551                                          struct device_attribute *attr,
 552                                          char *buf)
 553 {
 554         struct bonding *bond = to_bond(d);
 555
 556         return sprintf(buf, "%d\n", bond->params.arp_interval);
 557 }
 558
 559 static ssize_t bonding_store_arp_interval(struct device *d,
 560                                           struct device_attribute *attr,
 561                                           const char *buf, size_t count)
 562 {
 563         struct bonding *bond = to_bond(d);
 564         int new_value, ret = count;
 565
 566         if (!rtnl_trylock())
 567                 return restart_syscall();
 568         if (sscanf(buf, "%d", &new_value) != 1) {
 569                 pr_err("%s: no arp_interval value specified.\n",
 570                        bond->dev->name);
 571                 ret = -EINVAL;
 572                 goto out;
 573         }
 574         if (new_value < 0) {
 575                 pr_err("%s: Invalid arp_interval value %d not in range 0-%d; rejected.\n",
 576                        bond->dev->name, new_value, INT_MAX);
 577                 ret = -EINVAL;
 578                 goto out;
 579         }
 580         if (bond->params.mode == BOND_MODE_ALB ||
 581             bond->params.mode == BOND_MODE_TLB) {
 582                 pr_info("%s: ARP monitoring cannot be used with ALB/TLB. Only MII monitoring is supported on %s.\n",
 583                         bond->dev->name, bond->dev->name);
 584                 ret = -EINVAL;
 585                 goto out;
 586         }
 587         pr_info("%s: Setting ARP monitoring interval to %d.\n",
 588                 bond->dev->name, new_value);
 589         bond->params.arp_interval = new_value;
 590         if (new_value) {
 591                 if (bond->params.miimon) {
 592                         pr_info("%s: ARP monitoring cannot be used with MII monitoring. %s Disabling MII monitoring.\n",
 593                                 bond->dev->name, bond->dev->name);
 594                         bond->params.miimon = 0;
 595                 }
 596                 if (!bond->params.arp_targets[0])
 597                         pr_info("%s: ARP monitoring has been set up, but no ARP targets have been specified.\n",
 598                                 bond->dev->name);
 599         }
 600         if (bond->dev->flags & IFF_UP) {
 601                 /* If the interface is up, we may need to fire off
 602                  * the ARP timer.  If the interface is down, the
 603                  * timer will get fired off when the open function
 604                  * is called.
 605                  */
 606                 if (!new_value) {
 607                         if (bond->params.arp_validate)
 608                                 bond->recv_probe = NULL;
 609                         cancel_delayed_work_sync(&bond->arp_work);
 610                 } else {
 611                         /* arp_validate can be set only in active-backup mode */
 612                         if (bond->params.arp_validate)
 613                                 bond->recv_probe = bond_arp_rcv;
 614                         cancel_delayed_work_sync(&bond->mii_work);
 615                         queue_delayed_work(bond->wq, &bond->arp_work, 0);
 616                 }
 617         }
 618 out:
 619         rtnl_unlock();
 620         return ret;
 621 }
 622 static DEVICE_ATTR(arp_interval, S_IRUGO | S_IWUSR,
 623                    bonding_show_arp_interval, bonding_store_arp_interval);
 624
 625 /*
 626  * Show and set the arp targets.
 627  */
 628 static ssize_t bonding_show_arp_targets(struct device *d,
 629                                         struct device_attribute *attr,
 630                                         char *buf)
 631 {
 632         int i, res = 0;
 633         struct bonding *bond = to_bond(d);
 634
 635         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) {
 636                 if (bond->params.arp_targets[i])
 637                         res += sprintf(buf + res, "%pI4 ",
 638                                        &bond->params.arp_targets[i]);
 639         }
 640         if (res)
 641                 buf[res-1] = '\n'; /* eat the leftover space */
 642         return res;
 643 }
 644
 645 static ssize_t bonding_store_arp_targets(struct device *d,
 646                                          struct device_attribute *attr,
 647                                          const char *buf, size_t count)
 648 {
 649         struct bonding *bond = to_bond(d);
 650         struct slave *slave;
 651         __be32 newtarget, *targets;
 652         unsigned long *targets_rx;
 653         int ind, i, j, ret = -EINVAL;
 654
 655         targets = bond->params.arp_targets;
 656         newtarget = in_aton(buf + 1);
 657         /* look for adds */
 658         if (buf[0] == '+') {
 659                 if ((newtarget == 0) || (newtarget == htonl(INADDR_BROADCAST))) {
 660                         pr_err("%s: invalid ARP target %pI4 specified for addition\n",
 661                                bond->dev->name, &newtarget);
 662                         goto out;
 663                 }
 664
 665                 if (bond_get_targets_ip(targets, newtarget) != -1) { /* dup */
 666                         pr_err("%s: ARP target %pI4 is already present\n",
 667                                bond->dev->name, &newtarget);
 668                         goto out;
 669                 }
 670
 671                 ind = bond_get_targets_ip(targets, 0); /* first free slot */
 672                 if (ind == -1) {
 673                         pr_err("%s: ARP target table is full!\n",
 674                                bond->dev->name);
 675                         goto out;
 676                 }
 677
 678                 pr_info("%s: adding ARP target %pI4.\n", bond->dev->name,
 679                          &newtarget);
 680                 /* not to race with bond_arp_rcv */
 681                 write_lock_bh(&bond->lock);
 682                 bond_for_each_slave(bond, slave)
 683                         slave->target_last_arp_rx[ind] = jiffies;
 684                 targets[ind] = newtarget;
 685                 write_unlock_bh(&bond->lock);
 686         } else if (buf[0] == '-')       {
 687                 if ((newtarget == 0) || (newtarget == htonl(INADDR_BROADCAST))) {
 688                         pr_err("%s: invalid ARP target %pI4 specified for removal\n",
 689                                bond->dev->name, &newtarget);
 690                         goto out;
 691                 }
 692
 693                 ind = bond_get_targets_ip(targets, newtarget);
 694                 if (ind == -1) {
 695                         pr_err("%s: unable to remove nonexistent ARP target %pI4.\n",
 696                                 bond->dev->name, &newtarget);
 697                         goto out;
 698                 }
 699
 700                 if (ind == 0 && !targets[1] && bond->params.arp_interval)
 701                         pr_warn("%s: removing last arp target with arp_interval on\n",
 702                                 bond->dev->name);
 703
 704                 pr_info("%s: removing ARP target %pI4.\n", bond->dev->name,
 705                         &newtarget);
 706
 707                 write_lock_bh(&bond->lock);
 708                 bond_for_each_slave(bond, slave) {
 709                         targets_rx = slave->target_last_arp_rx;
 710                         j = ind;
 711                         for (; (j < BOND_MAX_ARP_TARGETS-1) && targets[j+1]; j++)
 712                                 targets_rx[j] = targets_rx[j+1];
 713                         targets_rx[j] = 0;
 714                 }
 715                 for (i = ind; (i < BOND_MAX_ARP_TARGETS-1) && targets[i+1]; i++)
 716                         targets[i] = targets[i+1];
 717                 targets[i] = 0;
 718                 write_unlock_bh(&bond->lock);
 719         } else {
 720                 pr_err("no command found in arp_ip_targets file for bond %s. Use +<addr> or -<addr>.\n",
 721                        bond->dev->name);
 722                 ret = -EPERM;
 723                 goto out;
 724         }
 725
 726         ret = count;
 727 out:
 728         return ret;
 729 }
 730 static DEVICE_ATTR(arp_ip_target, S_IRUGO | S_IWUSR , bonding_show_arp_targets, bonding_store_arp_targets);
 731
 732 /*
 733  * Show and set the up and down delays.  These must be multiples of the
 734  * MII monitoring value, and are stored internally as the multiplier.
 735  * Thus, we must translate to MS for the real world.
 736  */
 737 static ssize_t bonding_show_downdelay(struct device *d,
 738                                       struct device_attribute *attr,
 739                                       char *buf)
 740 {
 741         struct bonding *bond = to_bond(d);
 742
 743         return sprintf(buf, "%d\n", bond->params.downdelay * bond->params.miimon);
 744 }
 745
 746 static ssize_t bonding_store_downdelay(struct device *d,
 747                                        struct device_attribute *attr,
 748                                        const char *buf, size_t count)
 749 {
 750         int new_value, ret = count;
 751         struct bonding *bond = to_bond(d);
 752
 753         if (!(bond->params.miimon)) {
 754                 pr_err("%s: Unable to set down delay as MII monitoring is disabled\n",
 755                        bond->dev->name);
 756                 ret = -EPERM;
 757                 goto out;
 758         }
 759
 760         if (sscanf(buf, "%d", &new_value) != 1) {
 761                 pr_err("%s: no down delay value specified.\n", bond->dev->name);
 762                 ret = -EINVAL;
 763                 goto out;
 764         }
 765         if (new_value < 0) {
 766                 pr_err("%s: Invalid down delay value %d not in range %d-%d; rejected.\n",
 767                        bond->dev->name, new_value, 0, INT_MAX);
 768                 ret = -EINVAL;
 769                 goto out;
 770         } else {
 771                 if ((new_value % bond->params.miimon) != 0) {
 772                         pr_warning("%s: Warning: down delay (%d) is not a multiple of miimon (%d), delay rounded to %d ms\n",
 773                                    bond->dev->name, new_value,
 774                                    bond->params.miimon,
 775                                    (new_value / bond->params.miimon) *
 776                                    bond->params.miimon);
 777                 }
 778                 bond->params.downdelay = new_value / bond->params.miimon;
 779                 pr_info("%s: Setting down delay to %d.\n",
 780                         bond->dev->name,
 781                         bond->params.downdelay * bond->params.miimon);
 782
 783         }
 784
 785 out:
 786         return ret;
 787 }
 788 static DEVICE_ATTR(downdelay, S_IRUGO | S_IWUSR,
 789                    bonding_show_downdelay, bonding_store_downdelay);
 790
 791 static ssize_t bonding_show_updelay(struct device *d,
 792                                     struct device_attribute *attr,
 793                                     char *buf)
 794 {
 795         struct bonding *bond = to_bond(d);
 796
 797         return sprintf(buf, "%d\n", bond->params.updelay * bond->params.miimon);
 798
 799 }
 800
 801 static ssize_t bonding_store_updelay(struct device *d,
 802                                      struct device_attribute *attr,
 803                                      const char *buf, size_t count)
 804 {
 805         int new_value, ret = count;
 806         struct bonding *bond = to_bond(d);
 807
 808         if (!(bond->params.miimon)) {
 809                 pr_err("%s: Unable to set up delay as MII monitoring is disabled\n",
 810                        bond->dev->name);
 811                 ret = -EPERM;
 812                 goto out;
 813         }
 814
 815         if (sscanf(buf, "%d", &new_value) != 1) {
 816                 pr_err("%s: no up delay value specified.\n",
 817                        bond->dev->name);
 818                 ret = -EINVAL;
 819                 goto out;
 820         }
 821         if (new_value < 0) {
 822                 pr_err("%s: Invalid up delay value %d not in range %d-%d; rejected.\n",
 823                        bond->dev->name, new_value, 0, INT_MAX);
 824                 ret = -EINVAL;
 825                 goto out;
 826         } else {
 827                 if ((new_value % bond->params.miimon) != 0) {
 828                         pr_warning("%s: Warning: up delay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
 829                                    bond->dev->name, new_value,
 830                                    bond->params.miimon,
 831                                    (new_value / bond->params.miimon) *
 832                                    bond->params.miimon);
 833                 }
 834                 bond->params.updelay = new_value / bond->params.miimon;
 835                 pr_info("%s: Setting up delay to %d.\n",
 836                         bond->dev->name,
 837                         bond->params.updelay * bond->params.miimon);
 838         }
 839
 840 out:
 841         return ret;
 842 }
 843 static DEVICE_ATTR(updelay, S_IRUGO | S_IWUSR,
 844                    bonding_show_updelay, bonding_store_updelay);
 845
 846 /*
 847  * Show and set the LACP interval.  Interface must be down, and the mode
 848  * must be set to 802.3ad mode.
 849  */
 850 static ssize_t bonding_show_lacp(struct device *d,
 851                                  struct device_attribute *attr,
 852                                  char *buf)
 853 {
 854         struct bonding *bond = to_bond(d);
 855
 856         return sprintf(buf, "%s %d\n",
 857                 bond_lacp_tbl[bond->params.lacp_fast].modename,
 858                 bond->params.lacp_fast);
 859 }
 860
 861 static ssize_t bonding_store_lacp(struct device *d,
 862                                   struct device_attribute *attr,
 863                                   const char *buf, size_t count)
 864 {
 865         struct bonding *bond = to_bond(d);
 866         int new_value, ret = count;
 867
 868         if (!rtnl_trylock())
 869                 return restart_syscall();
 870
 871         if (bond->dev->flags & IFF_UP) {
 872                 pr_err("%s: Unable to update LACP rate because interface is up.\n",
 873                        bond->dev->name);
 874                 ret = -EPERM;
 875                 goto out;
 876         }
 877
 878         if (bond->params.mode != BOND_MODE_8023AD) {
 879                 pr_err("%s: Unable to update LACP rate because bond is not in 802.3ad mode.\n",
 880                        bond->dev->name);
 881                 ret = -EPERM;
 882                 goto out;
 883         }
 884
 885         new_value = bond_parse_parm(buf, bond_lacp_tbl);
 886
 887         if ((new_value == 1) || (new_value == 0)) {
 888                 bond->params.lacp_fast = new_value;
 889                 bond_3ad_update_lacp_rate(bond);
 890                 pr_info("%s: Setting LACP rate to %s (%d).\n",
 891                         bond->dev->name, bond_lacp_tbl[new_value].modename,
 892                         new_value);
 893         } else {
 894                 pr_err("%s: Ignoring invalid LACP rate value %.*s.\n",
 895                        bond->dev->name, (int)strlen(buf) - 1, buf);
 896                 ret = -EINVAL;
 897         }
 898 out:
 899         rtnl_unlock();
 900
 901         return ret;
 902 }
 903 static DEVICE_ATTR(lacp_rate, S_IRUGO | S_IWUSR,
 904                    bonding_show_lacp, bonding_store_lacp);
 905
 906 static ssize_t bonding_show_min_links(struct device *d,
 907                                       struct device_attribute *attr,
 908                                       char *buf)
 909 {
 910         struct bonding *bond = to_bond(d);
 911
 912         return sprintf(buf, "%d\n", bond->params.min_links);
 913 }
 914
 915 static ssize_t bonding_store_min_links(struct device *d,
 916                                        struct device_attribute *attr,
 917                                        const char *buf, size_t count)
 918 {
 919         struct bonding *bond = to_bond(d);
 920         int ret;
 921         unsigned int new_value;
 922
 923         ret = kstrtouint(buf, 0, &new_value);
 924         if (ret < 0) {
 925                 pr_err("%s: Ignoring invalid min links value %s.\n",
 926                        bond->dev->name, buf);
 927                 return ret;
 928         }
 929
 930         pr_info("%s: Setting min links value to %u\n",
 931                 bond->dev->name, new_value);
 932         bond->params.min_links = new_value;
 933         return count;
 934 }
 935 static DEVICE_ATTR(min_links, S_IRUGO | S_IWUSR,
 936                    bonding_show_min_links, bonding_store_min_links);
 937
 938 static ssize_t bonding_show_ad_select(struct device *d,
 939                                       struct device_attribute *attr,
 940                                       char *buf)
 941 {
 942         struct bonding *bond = to_bond(d);
 943
 944         return sprintf(buf, "%s %d\n",
 945                 ad_select_tbl[bond->params.ad_select].modename,
 946                 bond->params.ad_select);
 947 }
 948
 949
 950 static ssize_t bonding_store_ad_select(struct device *d,
 951                                        struct device_attribute *attr,
 952                                        const char *buf, size_t count)
 953 {
 954         int new_value, ret = count;
 955         struct bonding *bond = to_bond(d);
 956
 957         if (bond->dev->flags & IFF_UP) {
 958                 pr_err("%s: Unable to update ad_select because interface is up.\n",
 959                        bond->dev->name);
 960                 ret = -EPERM;
 961                 goto out;
 962         }
 963
 964         new_value = bond_parse_parm(buf, ad_select_tbl);
 965
 966         if (new_value != -1) {
 967                 bond->params.ad_select = new_value;
 968                 pr_info("%s: Setting ad_select to %s (%d).\n",
 969                         bond->dev->name, ad_select_tbl[new_value].modename,
 970                         new_value);
 971         } else {
 972                 pr_err("%s: Ignoring invalid ad_select value %.*s.\n",
 973                        bond->dev->name, (int)strlen(buf) - 1, buf);
 974                 ret = -EINVAL;
 975         }
 976 out:
 977         return ret;
 978 }
 979 static DEVICE_ATTR(ad_select, S_IRUGO | S_IWUSR,
 980                    bonding_show_ad_select, bonding_store_ad_select);
 981
 982 /*
 983  * Show and set the number of peer notifications to send after a failover event.
 984  */
 985 static ssize_t bonding_show_num_peer_notif(struct device *d,
 986                                            struct device_attribute *attr,
 987                                            char *buf)
 988 {
 989         struct bonding *bond = to_bond(d);
 990         return sprintf(buf, "%d\n", bond->params.num_peer_notif);
 991 }
 992
 993 static ssize_t bonding_store_num_peer_notif(struct device *d,
 994                                             struct device_attribute *attr,
 995                                             const char *buf, size_t count)
 996 {
 997         struct bonding *bond = to_bond(d);
 998         int err = kstrtou8(buf, 10, &bond->params.num_peer_notif);
 999         return err ? err : count;
1000 }
1001 static DEVICE_ATTR(num_grat_arp, S_IRUGO | S_IWUSR,
1002                    bonding_show_num_peer_notif, bonding_store_num_peer_notif);
1003 static DEVICE_ATTR(num_unsol_na, S_IRUGO | S_IWUSR,
1004                    bonding_show_num_peer_notif, bonding_store_num_peer_notif);
1005
1006 /*
1007  * Show and set the MII monitor interval.  There are two tricky bits
1008  * here.  First, if MII monitoring is activated, then we must disable
1009  * ARP monitoring.  Second, if the timer isn't running, we must
1010  * start it.
1011  */
1012 static ssize_t bonding_show_miimon(struct device *d,
1013                                    struct device_attribute *attr,
1014                                    char *buf)
1015 {
1016         struct bonding *bond = to_bond(d);
1017
1018         return sprintf(buf, "%d\n", bond->params.miimon);
1019 }
1020
1021 static ssize_t bonding_store_miimon(struct device *d,
1022                                     struct device_attribute *attr,
1023                                     const char *buf, size_t count)
1024 {
1025         int new_value, ret = count;
1026         struct bonding *bond = to_bond(d);
1027
1028         if (!rtnl_trylock())
1029                 return restart_syscall();
1030         if (sscanf(buf, "%d", &new_value) != 1) {
1031                 pr_err("%s: no miimon value specified.\n",
1032                        bond->dev->name);
1033                 ret = -EINVAL;
1034                 goto out;
1035         }
1036         if (new_value < 0) {
1037                 pr_err("%s: Invalid miimon value %d not in range %d-%d; rejected.\n",
1038                        bond->dev->name, new_value, 0, INT_MAX);
1039                 ret = -EINVAL;
1040                 goto out;
1041         }
1042         pr_info("%s: Setting MII monitoring interval to %d.\n",
1043                 bond->dev->name, new_value);
1044         bond->params.miimon = new_value;
1045         if (bond->params.updelay)
1046                 pr_info("%s: Note: Updating updelay (to %d) since it is a multiple of the miimon value.\n",
1047                         bond->dev->name,
1048                         bond->params.updelay * bond->params.miimon);
1049         if (bond->params.downdelay)
1050                 pr_info("%s: Note: Updating downdelay (to %d) since it is a multiple of the miimon value.\n",
1051                         bond->dev->name,
1052                         bond->params.downdelay * bond->params.miimon);
1053         if (new_value && bond->params.arp_interval) {
1054                 pr_info("%s: MII monitoring cannot be used with ARP monitoring. Disabling ARP monitoring...\n",
1055                         bond->dev->name);
1056                 bond->params.arp_interval = 0;
1057                 if (bond->params.arp_validate)
1058                         bond->params.arp_validate = BOND_ARP_VALIDATE_NONE;
1059         }
1060         if (bond->dev->flags & IFF_UP) {
1061                 /* If the interface is up, we may need to fire off
1062                  * the MII timer. If the interface is down, the
1063                  * timer will get fired off when the open function
1064                  * is called.
1065                  */
1066                 if (!new_value) {
1067                         cancel_delayed_work_sync(&bond->mii_work);
1068                 } else {
1069                         cancel_delayed_work_sync(&bond->arp_work);
1070                         queue_delayed_work(bond->wq, &bond->mii_work, 0);
1071                 }
1072         }
1073 out:
1074         rtnl_unlock();
1075         return ret;
1076 }
1077 static DEVICE_ATTR(miimon, S_IRUGO | S_IWUSR,
1078                    bonding_show_miimon, bonding_store_miimon);
1079
1080 /*
1081  * Show and set the primary slave.  The store function is much
1082  * simpler than bonding_store_slaves function because it only needs to
1083  * handle one interface name.
1084  * The bond must be a mode that supports a primary for this be
1085  * set.
1086  */
1087 static ssize_t bonding_show_primary(struct device *d,
1088                                     struct device_attribute *attr,
1089                                     char *buf)
1090 {
1091         int count = 0;
1092         struct bonding *bond = to_bond(d);
1093
1094         if (bond->primary_slave)
1095                 count = sprintf(buf, "%s\n", bond->primary_slave->dev->name);
1096
1097         return count;
1098 }
1099
1100 static ssize_t bonding_store_primary(struct device *d,
1101                                      struct device_attribute *attr,
1102                                      const char *buf, size_t count)
1103 {
1104         struct bonding *bond = to_bond(d);
1105         char ifname[IFNAMSIZ];
1106         struct slave *slave;
1107
1108         if (!rtnl_trylock())
1109                 return restart_syscall();
1110         block_netpoll_tx();
1111         read_lock(&bond->lock);
1112         write_lock_bh(&bond->curr_slave_lock);
1113
1114         if (!USES_PRIMARY(bond->params.mode)) {
1115                 pr_info("%s: Unable to set primary slave; %s is in mode %d\n",
1116                         bond->dev->name, bond->dev->name, bond->params.mode);
1117                 goto out;
1118         }
1119
1120         sscanf(buf, "%15s", ifname); /* IFNAMSIZ */
1121
1122         /* check to see if we are clearing primary */
1123         if (!strlen(ifname) || buf[0] == '\n') {
1124                 pr_info("%s: Setting primary slave to None.\n",
1125                         bond->dev->name);
1126                 bond->primary_slave = NULL;
1127                 memset(bond->params.primary, 0, sizeof(bond->params.primary));
1128                 bond_select_active_slave(bond);
1129                 goto out;
1130         }
1131
1132         bond_for_each_slave(bond, slave) {
1133                 if (strncmp(slave->dev->name, ifname, IFNAMSIZ) == 0) {
1134                         pr_info("%s: Setting %s as primary slave.\n",
1135                                 bond->dev->name, slave->dev->name);
1136                         bond->primary_slave = slave;
1137                         strcpy(bond->params.primary, slave->dev->name);
1138                         bond_select_active_slave(bond);
1139                         goto out;
1140                 }
1141         }
1142
1143         strncpy(bond->params.primary, ifname, IFNAMSIZ);
1144         bond->params.primary[IFNAMSIZ - 1] = 0;
1145
1146         pr_info("%s: Recording %s as primary, "
1147                 "but it has not been enslaved to %s yet.\n",
1148                 bond->dev->name, ifname, bond->dev->name);
1149 out:
1150         write_unlock_bh(&bond->curr_slave_lock);
1151         read_unlock(&bond->lock);
1152         unblock_netpoll_tx();
1153         rtnl_unlock();
1154
1155         return count;
1156 }
1157 static DEVICE_ATTR(primary, S_IRUGO | S_IWUSR,
1158                    bonding_show_primary, bonding_store_primary);
1159
1160 /*
1161  * Show and set the primary_reselect flag.
1162  */
1163 static ssize_t bonding_show_primary_reselect(struct device *d,
1164                                              struct device_attribute *attr,
1165                                              char *buf)
1166 {
1167         struct bonding *bond = to_bond(d);
1168
1169         return sprintf(buf, "%s %d\n",
1170                        pri_reselect_tbl[bond->params.primary_reselect].modename,
1171                        bond->params.primary_reselect);
1172 }
1173
1174 static ssize_t bonding_store_primary_reselect(struct device *d,
1175                                               struct device_attribute *attr,
1176                                               const char *buf, size_t count)
1177 {
1178         int new_value, ret = count;
1179         struct bonding *bond = to_bond(d);
1180
1181         if (!rtnl_trylock())
1182                 return restart_syscall();
1183
1184         new_value = bond_parse_parm(buf, pri_reselect_tbl);
1185         if (new_value < 0)  {
1186                 pr_err("%s: Ignoring invalid primary_reselect value %.*s.\n",
1187                        bond->dev->name,
1188                        (int) strlen(buf) - 1, buf);
1189                 ret = -EINVAL;
1190                 goto out;
1191         }
1192
1193         bond->params.primary_reselect = new_value;
1194         pr_info("%s: setting primary_reselect to %s (%d).\n",
1195                 bond->dev->name, pri_reselect_tbl[new_value].modename,
1196                 new_value);
1197
1198         block_netpoll_tx();
1199         read_lock(&bond->lock);
1200         write_lock_bh(&bond->curr_slave_lock);
1201         bond_select_active_slave(bond);
1202         write_unlock_bh(&bond->curr_slave_lock);
1203         read_unlock(&bond->lock);
1204         unblock_netpoll_tx();
1205 out:
1206         rtnl_unlock();
1207         return ret;
1208 }
1209 static DEVICE_ATTR(primary_reselect, S_IRUGO | S_IWUSR,
1210                    bonding_show_primary_reselect,
1211                    bonding_store_primary_reselect);
1212
1213 /*
1214  * Show and set the use_carrier flag.
1215  */
1216 static ssize_t bonding_show_carrier(struct device *d,
1217                                     struct device_attribute *attr,
1218                                     char *buf)
1219 {
1220         struct bonding *bond = to_bond(d);
1221
1222         return sprintf(buf, "%d\n", bond->params.use_carrier);
1223 }
1224
1225 static ssize_t bonding_store_carrier(struct device *d,
1226                                      struct device_attribute *attr,
1227                                      const char *buf, size_t count)
1228 {
1229         int new_value, ret = count;
1230         struct bonding *bond = to_bond(d);
1231
1232
1233         if (sscanf(buf, "%d", &new_value) != 1) {
1234                 pr_err("%s: no use_carrier value specified.\n",
1235                        bond->dev->name);
1236                 ret = -EINVAL;
1237                 goto out;
1238         }
1239         if ((new_value == 0) || (new_value == 1)) {
1240                 bond->params.use_carrier = new_value;
1241                 pr_info("%s: Setting use_carrier to %d.\n",
1242                         bond->dev->name, new_value);
1243         } else {
1244                 pr_info("%s: Ignoring invalid use_carrier value %d.\n",
1245                         bond->dev->name, new_value);
1246         }
1247 out:
1248         return ret;
1249 }
1250 static DEVICE_ATTR(use_carrier, S_IRUGO | S_IWUSR,
1251                    bonding_show_carrier, bonding_store_carrier);
1252
1253
1254 /*
1255  * Show and set currently active_slave.
1256  */
1257 static ssize_t bonding_show_active_slave(struct device *d,
1258                                          struct device_attribute *attr,
1259                                          char *buf)
1260 {
1261         struct bonding *bond = to_bond(d);
1262         struct slave *curr;
1263         int count = 0;
1264
1265         rcu_read_lock();
1266         curr = rcu_dereference(bond->curr_active_slave);
1267         if (USES_PRIMARY(bond->params.mode) && curr)
1268                 count = sprintf(buf, "%s\n", curr->dev->name);
1269         rcu_read_unlock();
1270
1271         return count;
1272 }
1273
1274 static ssize_t bonding_store_active_slave(struct device *d,
1275                                           struct device_attribute *attr,
1276                                           const char *buf, size_t count)
1277 {
1278         struct slave *slave, *old_active, *new_active;
1279         struct bonding *bond = to_bond(d);
1280         char ifname[IFNAMSIZ];
1281
1282         if (!rtnl_trylock())
1283                 return restart_syscall();
1284
1285         old_active = new_active = NULL;
1286         block_netpoll_tx();
1287         read_lock(&bond->lock);
1288         write_lock_bh(&bond->curr_slave_lock);
1289
1290         if (!USES_PRIMARY(bond->params.mode)) {
1291                 pr_info("%s: Unable to change active slave; %s is in mode %d\n",
1292                         bond->dev->name, bond->dev->name, bond->params.mode);
1293                 goto out;
1294         }
1295
1296         sscanf(buf, "%15s", ifname); /* IFNAMSIZ */
1297
1298         /* check to see if we are clearing active */
1299         if (!strlen(ifname) || buf[0] == '\n') {
1300                 pr_info("%s: Clearing current active slave.\n",
1301                         bond->dev->name);
1302                 rcu_assign_pointer(bond->curr_active_slave, NULL);
1303                 bond_select_active_slave(bond);
1304                 goto out;
1305         }
1306
1307         bond_for_each_slave(bond, slave) {
1308                 if (strncmp(slave->dev->name, ifname, IFNAMSIZ) == 0) {
1309                         old_active = bond->curr_active_slave;
1310                         new_active = slave;
1311                         if (new_active == old_active) {
1312                                 /* do nothing */
1313                                 pr_info("%s: %s is already the current"
1314                                         " active slave.\n",
1315                                         bond->dev->name,
1316                                         slave->dev->name);
1317                                 goto out;
1318                         } else {
1319                                 if ((new_active) &&
1320                                     (old_active) &&
1321                                     (new_active->link == BOND_LINK_UP) &&
1322                                     IS_UP(new_active->dev)) {
1323                                         pr_info("%s: Setting %s as active"
1324                                                 " slave.\n",
1325                                                 bond->dev->name,
1326                                                 slave->dev->name);
1327                                         bond_change_active_slave(bond,
1328                                                                  new_active);
1329                                 } else {
1330                                         pr_info("%s: Could not set %s as"
1331                                                 " active slave; either %s is"
1332                                                 " down or the link is down.\n",
1333                                                 bond->dev->name,
1334                                                 slave->dev->name,
1335                                                 slave->dev->name);
1336                                 }
1337                                 goto out;
1338                         }
1339                 }
1340         }
1341
1342         pr_info("%s: Unable to set %.*s as active slave.\n",
1343                 bond->dev->name, (int)strlen(buf) - 1, buf);
1344  out:
1345         write_unlock_bh(&bond->curr_slave_lock);
1346         read_unlock(&bond->lock);
1347         unblock_netpoll_tx();
1348
1349         rtnl_unlock();
1350
1351         return count;
1352
1353 }
1354 static DEVICE_ATTR(active_slave, S_IRUGO | S_IWUSR,
1355                    bonding_show_active_slave, bonding_store_active_slave);
1356
1357
1358 /*
1359  * Show link status of the bond interface.
1360  */
1361 static ssize_t bonding_show_mii_status(struct device *d,
1362                                        struct device_attribute *attr,
1363                                        char *buf)
1364 {
1365         struct bonding *bond = to_bond(d);
1366
1367         return sprintf(buf, "%s\n", bond->curr_active_slave ? "up" : "down");
1368 }
1369 static DEVICE_ATTR(mii_status, S_IRUGO, bonding_show_mii_status, NULL);
1370
1371 /*
1372  * Show current 802.3ad aggregator ID.
1373  */
1374 static ssize_t bonding_show_ad_aggregator(struct device *d,
1375                                           struct device_attribute *attr,
1376                                           char *buf)
1377 {
1378         int count = 0;
1379         struct bonding *bond = to_bond(d);
1380
1381         if (bond->params.mode == BOND_MODE_8023AD) {
1382                 struct ad_info ad_info;
1383                 count = sprintf(buf, "%d\n",
1384                                 bond_3ad_get_active_agg_info(bond, &ad_info)
1385                                 ?  0 : ad_info.aggregator_id);
1386         }
1387
1388         return count;
1389 }
1390 static DEVICE_ATTR(ad_aggregator, S_IRUGO, bonding_show_ad_aggregator, NULL);
1391
1392
1393 /*
1394  * Show number of active 802.3ad ports.
1395  */
1396 static ssize_t bonding_show_ad_num_ports(struct device *d,
1397                                          struct device_attribute *attr,
1398                                          char *buf)
1399 {
1400         int count = 0;
1401         struct bonding *bond = to_bond(d);
1402
1403         if (bond->params.mode == BOND_MODE_8023AD) {
1404                 struct ad_info ad_info;
1405                 count = sprintf(buf, "%d\n",
1406                                 bond_3ad_get_active_agg_info(bond, &ad_info)
1407                                 ?  0 : ad_info.ports);
1408         }
1409
1410         return count;
1411 }
1412 static DEVICE_ATTR(ad_num_ports, S_IRUGO, bonding_show_ad_num_ports, NULL);
1413
1414
1415 /*
1416  * Show current 802.3ad actor key.
1417  */
1418 static ssize_t bonding_show_ad_actor_key(struct device *d,
1419                                          struct device_attribute *attr,
1420                                          char *buf)
1421 {
1422         int count = 0;
1423         struct bonding *bond = to_bond(d);
1424
1425         if (bond->params.mode == BOND_MODE_8023AD) {
1426                 struct ad_info ad_info;
1427                 count = sprintf(buf, "%d\n",
1428                                 bond_3ad_get_active_agg_info(bond, &ad_info)
1429                                 ?  0 : ad_info.actor_key);
1430         }
1431
1432         return count;
1433 }
1434 static DEVICE_ATTR(ad_actor_key, S_IRUGO, bonding_show_ad_actor_key, NULL);
1435
1436
1437 /*
1438  * Show current 802.3ad partner key.
1439  */
1440 static ssize_t bonding_show_ad_partner_key(struct device *d,
1441                                            struct device_attribute *attr,
1442                                            char *buf)
1443 {
1444         int count = 0;
1445         struct bonding *bond = to_bond(d);
1446
1447         if (bond->params.mode == BOND_MODE_8023AD) {
1448                 struct ad_info ad_info;
1449                 count = sprintf(buf, "%d\n",
1450                                 bond_3ad_get_active_agg_info(bond, &ad_info)
1451                                 ?  0 : ad_info.partner_key);
1452         }
1453
1454         return count;
1455 }
1456 static DEVICE_ATTR(ad_partner_key, S_IRUGO, bonding_show_ad_partner_key, NULL);
1457
1458
1459 /*
1460  * Show current 802.3ad partner mac.
1461  */
1462 static ssize_t bonding_show_ad_partner_mac(struct device *d,
1463                                            struct device_attribute *attr,
1464                                            char *buf)
1465 {
1466         int count = 0;
1467         struct bonding *bond = to_bond(d);
1468
1469         if (bond->params.mode == BOND_MODE_8023AD) {
1470                 struct ad_info ad_info;
1471                 if (!bond_3ad_get_active_agg_info(bond, &ad_info))
1472                         count = sprintf(buf, "%pM\n", ad_info.partner_system);
1473         }
1474
1475         return count;
1476 }
1477 static DEVICE_ATTR(ad_partner_mac, S_IRUGO, bonding_show_ad_partner_mac, NULL);
1478
1479 /*
1480  * Show the queue_ids of the slaves in the current bond.
1481  */
1482 static ssize_t bonding_show_queue_id(struct device *d,
1483                                      struct device_attribute *attr,
1484                                      char *buf)
1485 {
1486         struct bonding *bond = to_bond(d);
1487         struct slave *slave;
1488         int res = 0;
1489
1490         if (!rtnl_trylock())
1491                 return restart_syscall();
1492
1493         read_lock(&bond->lock);
1494         bond_for_each_slave(bond, slave) {
1495                 if (res > (PAGE_SIZE - IFNAMSIZ - 6)) {
1496                         /* not enough space for another interface_name:queue_id pair */
1497                         if ((PAGE_SIZE - res) > 10)
1498                                 res = PAGE_SIZE - 10;
1499                         res += sprintf(buf + res, "++more++ ");
1500                         break;
1501                 }
1502                 res += sprintf(buf + res, "%s:%d ",
1503                                slave->dev->name, slave->queue_id);
1504         }
1505         read_unlock(&bond->lock);
1506         if (res)
1507                 buf[res-1] = '\n'; /* eat the leftover space */
1508         rtnl_unlock();
1509
1510         return res;
1511 }
1512
1513 /*
1514  * Set the queue_ids of the  slaves in the current bond.  The bond
1515  * interface must be enslaved for this to work.
1516  */
1517 static ssize_t bonding_store_queue_id(struct device *d,
1518                                       struct device_attribute *attr,
1519                                       const char *buffer, size_t count)
1520 {
1521         struct slave *slave, *update_slave;
1522         struct bonding *bond = to_bond(d);
1523         u16 qid;
1524         int ret = count;
1525         char *delim;
1526         struct net_device *sdev = NULL;
1527
1528         if (!rtnl_trylock())
1529                 return restart_syscall();
1530
1531         /* delim will point to queue id if successful */
1532         delim = strchr(buffer, ':');
1533         if (!delim)
1534                 goto err_no_cmd;
1535
1536         /*
1537          * Terminate string that points to device name and bump it
1538          * up one, so we can read the queue id there.
1539          */
1540         *delim = '\0';
1541         if (sscanf(++delim, "%hd\n", &qid) != 1)
1542                 goto err_no_cmd;
1543
1544         /* Check buffer length, valid ifname and queue id */
1545         if (strlen(buffer) > IFNAMSIZ ||
1546             !dev_valid_name(buffer) ||
1547             qid > bond->dev->real_num_tx_queues)
1548                 goto err_no_cmd;
1549
1550         /* Get the pointer to that interface if it exists */
1551         sdev = __dev_get_by_name(dev_net(bond->dev), buffer);
1552         if (!sdev)
1553                 goto err_no_cmd;
1554
1555         read_lock(&bond->lock);
1556
1557         /* Search for thes slave and check for duplicate qids */
1558         update_slave = NULL;
1559         bond_for_each_slave(bond, slave) {
1560                 if (sdev == slave->dev)
1561                         /*
1562                          * We don't need to check the matching
1563                          * slave for dups, since we're overwriting it
1564                          */
1565                         update_slave = slave;
1566                 else if (qid && qid == slave->queue_id) {
1567                         goto err_no_cmd_unlock;
1568                 }
1569         }
1570
1571         if (!update_slave)
1572                 goto err_no_cmd_unlock;
1573
1574         /* Actually set the qids for the slave */
1575         update_slave->queue_id = qid;
1576
1577         read_unlock(&bond->lock);
1578 out:
1579         rtnl_unlock();
1580         return ret;
1581
1582 err_no_cmd_unlock:
1583         read_unlock(&bond->lock);
1584 err_no_cmd:
1585         pr_info("invalid input for queue_id set for %s.\n",
1586                 bond->dev->name);
1587         ret = -EPERM;
1588         goto out;
1589 }
1590
1591 static DEVICE_ATTR(queue_id, S_IRUGO | S_IWUSR, bonding_show_queue_id,
1592                    bonding_store_queue_id);
1593
1594
1595 /*
1596  * Show and set the all_slaves_active flag.
1597  */
1598 static ssize_t bonding_show_slaves_active(struct device *d,
1599                                           struct device_attribute *attr,
1600                                           char *buf)
1601 {
1602         struct bonding *bond = to_bond(d);
1603
1604         return sprintf(buf, "%d\n", bond->params.all_slaves_active);
1605 }
1606
1607 static ssize_t bonding_store_slaves_active(struct device *d,
1608                                            struct device_attribute *attr,
1609                                            const char *buf, size_t count)
1610 {
1611         struct bonding *bond = to_bond(d);
1612         int new_value, ret = count;
1613         struct slave *slave;
1614
1615         if (sscanf(buf, "%d", &new_value) != 1) {
1616                 pr_err("%s: no all_slaves_active value specified.\n",
1617                        bond->dev->name);
1618                 ret = -EINVAL;
1619                 goto out;
1620         }
1621
1622         if (new_value == bond->params.all_slaves_active)
1623                 goto out;
1624
1625         if ((new_value == 0) || (new_value == 1)) {
1626                 bond->params.all_slaves_active = new_value;
1627         } else {
1628                 pr_info("%s: Ignoring invalid all_slaves_active value %d.\n",
1629                         bond->dev->name, new_value);
1630                 ret = -EINVAL;
1631                 goto out;
1632         }
1633
1634         read_lock(&bond->lock);
1635         bond_for_each_slave(bond, slave) {
1636                 if (!bond_is_active_slave(slave)) {
1637                         if (new_value)
1638                                 slave->inactive = 0;
1639                         else
1640                                 slave->inactive = 1;
1641                 }
1642         }
1643         read_unlock(&bond->lock);
1644 out:
1645         return ret;
1646 }
1647 static DEVICE_ATTR(all_slaves_active, S_IRUGO | S_IWUSR,
1648                    bonding_show_slaves_active, bonding_store_slaves_active);
1649
1650 /*
1651  * Show and set the number of IGMP membership reports to send on link failure
1652  */
1653 static ssize_t bonding_show_resend_igmp(struct device *d,
1654                                         struct device_attribute *attr,
1655                                         char *buf)
1656 {
1657         struct bonding *bond = to_bond(d);
1658
1659         return sprintf(buf, "%d\n", bond->params.resend_igmp);
1660 }
1661
1662 static ssize_t bonding_store_resend_igmp(struct device *d,
1663                                          struct device_attribute *attr,
1664                                          const char *buf, size_t count)
1665 {
1666         int new_value, ret = count;
1667         struct bonding *bond = to_bond(d);
1668
1669         if (sscanf(buf, "%d", &new_value) != 1) {
1670                 pr_err("%s: no resend_igmp value specified.\n",
1671                        bond->dev->name);
1672                 ret = -EINVAL;
1673                 goto out;
1674         }
1675
1676         if (new_value < 0 || new_value > 255) {
1677                 pr_err("%s: Invalid resend_igmp value %d not in range 0-255; rejected.\n",
1678                        bond->dev->name, new_value);
1679                 ret = -EINVAL;
1680                 goto out;
1681         }
1682
1683         pr_info("%s: Setting resend_igmp to %d.\n",
1684                 bond->dev->name, new_value);
1685         bond->params.resend_igmp = new_value;
1686 out:
1687         return ret;
1688 }
1689
1690 static DEVICE_ATTR(resend_igmp, S_IRUGO | S_IWUSR,
1691                    bonding_show_resend_igmp, bonding_store_resend_igmp);
1692
1693
1694 static ssize_t bonding_show_lp_interval(struct device *d,
1695                                         struct device_attribute *attr,
1696                                         char *buf)
1697 {
1698         struct bonding *bond = to_bond(d);
1699         return sprintf(buf, "%d\n", bond->params.lp_interval);
1700 }
1701
1702 static ssize_t bonding_store_lp_interval(struct device *d,
1703                                          struct device_attribute *attr,
1704                                          const char *buf, size_t count)
1705 {
1706         struct bonding *bond = to_bond(d);
1707         int new_value, ret = count;
1708
1709         if (sscanf(buf, "%d", &new_value) != 1) {
1710                 pr_err("%s: no lp interval value specified.\n",
1711                         bond->dev->name);
1712                 ret = -EINVAL;
1713                 goto out;
1714         }
1715
1716         if (new_value <= 0) {
1717                 pr_err ("%s: lp_interval must be between 1 and %d\n",
1718                         bond->dev->name, INT_MAX);
1719                 ret = -EINVAL;
1720                 goto out;
1721         }
1722
1723         bond->params.lp_interval = new_value;
1724 out:
1725         return ret;
1726 }
1727
1728 static DEVICE_ATTR(lp_interval, S_IRUGO | S_IWUSR,
1729                    bonding_show_lp_interval, bonding_store_lp_interval);
1730
1731 static struct attribute *per_bond_attrs[] = {
1732         &dev_attr_slaves.attr,
1733         &dev_attr_mode.attr,
1734         &dev_attr_fail_over_mac.attr,
1735         &dev_attr_arp_validate.attr,
1736         &dev_attr_arp_all_targets.attr,
1737         &dev_attr_arp_interval.attr,
1738         &dev_attr_arp_ip_target.attr,
1739         &dev_attr_downdelay.attr,
1740         &dev_attr_updelay.attr,
1741         &dev_attr_lacp_rate.attr,
1742         &dev_attr_ad_select.attr,
1743         &dev_attr_xmit_hash_policy.attr,
1744         &dev_attr_num_grat_arp.attr,
1745         &dev_attr_num_unsol_na.attr,
1746         &dev_attr_miimon.attr,
1747         &dev_attr_primary.attr,
1748         &dev_attr_primary_reselect.attr,
1749         &dev_attr_use_carrier.attr,
1750         &dev_attr_active_slave.attr,
1751         &dev_attr_mii_status.attr,
1752         &dev_attr_ad_aggregator.attr,
1753         &dev_attr_ad_num_ports.attr,
1754         &dev_attr_ad_actor_key.attr,
1755         &dev_attr_ad_partner_key.attr,
1756         &dev_attr_ad_partner_mac.attr,
1757         &dev_attr_queue_id.attr,
1758         &dev_attr_all_slaves_active.attr,
1759         &dev_attr_resend_igmp.attr,
1760         &dev_attr_min_links.attr,
1761         &dev_attr_lp_interval.attr,
1762         NULL,
1763 };
1764
1765 static struct attribute_group bonding_group = {
1766         .name = "bonding",
1767         .attrs = per_bond_attrs,
1768 };
1769
1770 /*
1771  * Initialize sysfs.  This sets up the bonding_masters file in
1772  * /sys/class/net.
1773  */
1774 int bond_create_sysfs(struct bond_net *bn)
1775 {
1776         int ret;
1777
1778         bn->class_attr_bonding_masters = class_attr_bonding_masters;
1779         sysfs_attr_init(&bn->class_attr_bonding_masters.attr);
1780
1781         ret = netdev_class_create_file_ns(&bn->class_attr_bonding_masters,
1782                                           bn->net);
1783         /*
1784          * Permit multiple loads of the module by ignoring failures to
1785          * create the bonding_masters sysfs file.  Bonding devices
1786          * created by second or subsequent loads of the module will
1787          * not be listed in, or controllable by, bonding_masters, but
1788          * will have the usual "bonding" sysfs directory.
1789          *
1790          * This is done to preserve backwards compatibility for
1791          * initscripts/sysconfig, which load bonding multiple times to
1792          * configure multiple bonding devices.
1793          */
1794         if (ret == -EEXIST) {
1795                 /* Is someone being kinky and naming a device bonding_master? */
1796                 if (__dev_get_by_name(bn->net,
1797                                       class_attr_bonding_masters.attr.name))
1798                         pr_err("network device named %s already exists in sysfs",
1799                                class_attr_bonding_masters.attr.name);
1800                 ret = 0;
1801         }
1802
1803         return ret;
1804
1805 }
1806
1807 /*
1808  * Remove /sys/class/net/bonding_masters.
1809  */
1810 void bond_destroy_sysfs(struct bond_net *bn)
1811 {
1812         netdev_class_remove_file_ns(&bn->class_attr_bonding_masters, bn->net);
1813 }
1814
1815 /*
1816  * Initialize sysfs for each bond.  This sets up and registers
1817  * the 'bondctl' directory for each individual bond under /sys/class/net.
1818  */
1819 void bond_prepare_sysfs_group(struct bonding *bond)
1820 {
1821         bond->dev->sysfs_groups[0] = &bonding_group;
1822 }
1823