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 static const void *bonding_namespace(struct class *cls,
 153                                      const struct class_attribute *attr)
 154 {
 155         const struct bond_net *bn =
 156                 container_of(attr, struct bond_net, class_attr_bonding_masters);
 157         return bn->net;
 158 }
 159
 160 /* class attribute for bond_masters file.  This ends up in /sys/class/net */
 161 static const struct class_attribute class_attr_bonding_masters = {
 162         .attr = {
 163                 .name = "bonding_masters",
 164                 .mode = S_IWUSR | S_IRUGO,
 165         },
 166         .show = bonding_show_bonds,
 167         .store = bonding_store_bonds,
 168         .namespace = bonding_namespace,
 169 };
 170
 171 int bond_create_slave_symlinks(struct net_device *master,
 172                                struct net_device *slave)
 173 {
 174         char linkname[IFNAMSIZ+7];
 175         int ret = 0;
 176
 177         /* first, create a link from the slave back to the master */
 178         ret = sysfs_create_link(&(slave->dev.kobj), &(master->dev.kobj),
 179                                 "master");
 180         if (ret)
 181                 return ret;
 182         /* next, create a link from the master to the slave */
 183         sprintf(linkname, "slave_%s", slave->name);
 184         ret = sysfs_create_link(&(master->dev.kobj), &(slave->dev.kobj),
 185                                 linkname);
 186
 187         /* free the master link created earlier in case of error */
 188         if (ret)
 189                 sysfs_remove_link(&(slave->dev.kobj), "master");
 190
 191         return ret;
 192
 193 }
 194
 195 void bond_destroy_slave_symlinks(struct net_device *master,
 196                                  struct net_device *slave)
 197 {
 198         char linkname[IFNAMSIZ+7];
 199
 200         sysfs_remove_link(&(slave->dev.kobj), "master");
 201         sprintf(linkname, "slave_%s", slave->name);
 202         sysfs_remove_link(&(master->dev.kobj), linkname);
 203 }
 204
 205
 206 /*
 207  * Show the slaves in the current bond.
 208  */
 209 static ssize_t bonding_show_slaves(struct device *d,
 210                                    struct device_attribute *attr, char *buf)
 211 {
 212         struct bonding *bond = to_bond(d);
 213         struct slave *slave;
 214         int res = 0;
 215
 216         read_lock(&bond->lock);
 217         bond_for_each_slave(bond, slave) {
 218                 if (res > (PAGE_SIZE - IFNAMSIZ)) {
 219                         /* not enough space for another interface name */
 220                         if ((PAGE_SIZE - res) > 10)
 221                                 res = PAGE_SIZE - 10;
 222                         res += sprintf(buf + res, "++more++ ");
 223                         break;
 224                 }
 225                 res += sprintf(buf + res, "%s ", slave->dev->name);
 226         }
 227         read_unlock(&bond->lock);
 228         if (res)
 229                 buf[res-1] = '\n'; /* eat the leftover space */
 230
 231         return res;
 232 }
 233
 234 /*
 235  * Set the slaves in the current bond.
 236  * This is supposed to be only thin wrapper for bond_enslave and bond_release.
 237  * All hard work should be done there.
 238  */
 239 static ssize_t bonding_store_slaves(struct device *d,
 240                                     struct device_attribute *attr,
 241                                     const char *buffer, size_t count)
 242 {
 243         char command[IFNAMSIZ + 1] = { 0, };
 244         char *ifname;
 245         int res, ret = count;
 246         struct net_device *dev;
 247         struct bonding *bond = to_bond(d);
 248
 249         if (!rtnl_trylock())
 250                 return restart_syscall();
 251
 252         sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
 253         ifname = command + 1;
 254         if ((strlen(command) <= 1) ||
 255             !dev_valid_name(ifname))
 256                 goto err_no_cmd;
 257
 258         dev = __dev_get_by_name(dev_net(bond->dev), ifname);
 259         if (!dev) {
 260                 pr_info("%s: Interface %s does not exist!\n",
 261                         bond->dev->name, ifname);
 262                 ret = -ENODEV;
 263                 goto out;
 264         }
 265
 266         switch (command[0]) {
 267         case '+':
 268                 pr_info("%s: Adding slave %s.\n", bond->dev->name, dev->name);
 269                 res = bond_enslave(bond->dev, dev);
 270                 break;
 271
 272         case '-':
 273                 pr_info("%s: Removing slave %s.\n", bond->dev->name, dev->name);
 274                 res = bond_release(bond->dev, dev);
 275                 break;
 276
 277         default:
 278                 goto err_no_cmd;
 279         }
 280
 281         if (res)
 282                 ret = res;
 283         goto out;
 284
 285 err_no_cmd:
 286         pr_err("no command found in slaves file for bond %s. Use +ifname or -ifname.\n",
 287                bond->dev->name);
 288         ret = -EPERM;
 289
 290 out:
 291         rtnl_unlock();
 292         return ret;
 293 }
 294
 295 static DEVICE_ATTR(slaves, S_IRUGO | S_IWUSR, bonding_show_slaves,
 296                    bonding_store_slaves);
 297
 298 /*
 299  * Show and set the bonding mode.  The bond interface must be down to
 300  * change the mode.
 301  */
 302 static ssize_t bonding_show_mode(struct device *d,
 303                                  struct device_attribute *attr, char *buf)
 304 {
 305         struct bonding *bond = to_bond(d);
 306
 307         return sprintf(buf, "%s %d\n",
 308                         bond_mode_tbl[bond->params.mode].modename,
 309                         bond->params.mode);
 310 }
 311
 312 static ssize_t bonding_store_mode(struct device *d,
 313                                   struct device_attribute *attr,
 314                                   const char *buf, size_t count)
 315 {
 316         int new_value, ret = count;
 317         struct bonding *bond = to_bond(d);
 318
 319         if (!rtnl_trylock())
 320                 return restart_syscall();
 321
 322         if (bond->dev->flags & IFF_UP) {
 323                 pr_err("unable to update mode of %s because interface is up.\n",
 324                        bond->dev->name);
 325                 ret = -EPERM;
 326                 goto out;
 327         }
 328
 329         if (!list_empty(&bond->slave_list)) {
 330                 pr_err("unable to update mode of %s because it has slaves.\n",
 331                         bond->dev->name);
 332                 ret = -EPERM;
 333                 goto out;
 334         }
 335
 336         new_value = bond_parse_parm(buf, bond_mode_tbl);
 337         if (new_value < 0)  {
 338                 pr_err("%s: Ignoring invalid mode value %.*s.\n",
 339                        bond->dev->name, (int)strlen(buf) - 1, buf);
 340                 ret = -EINVAL;
 341                 goto out;
 342         }
 343         if ((new_value == BOND_MODE_ALB ||
 344              new_value == BOND_MODE_TLB) &&
 345             bond->params.arp_interval) {
 346                 pr_err("%s: %s mode is incompatible with arp monitoring.\n",
 347                        bond->dev->name, bond_mode_tbl[new_value].modename);
 348                 ret = -EINVAL;
 349                 goto out;
 350         }
 351
 352         /* don't cache arp_validate between modes */
 353         bond->params.arp_validate = BOND_ARP_VALIDATE_NONE;
 354         bond->params.mode = new_value;
 355         bond_set_mode_ops(bond, bond->params.mode);
 356         pr_info("%s: setting mode to %s (%d).\n",
 357                 bond->dev->name, bond_mode_tbl[new_value].modename,
 358                 new_value);
 359 out:
 360         rtnl_unlock();
 361         return ret;
 362 }
 363 static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
 364                    bonding_show_mode, bonding_store_mode);
 365
 366 /*
 367  * Show and set the bonding transmit hash method.
 368  */
 369 static ssize_t bonding_show_xmit_hash(struct device *d,
 370                                       struct device_attribute *attr,
 371                                       char *buf)
 372 {
 373         struct bonding *bond = to_bond(d);
 374
 375         return sprintf(buf, "%s %d\n",
 376                        xmit_hashtype_tbl[bond->params.xmit_policy].modename,
 377                        bond->params.xmit_policy);
 378 }
 379
 380 static ssize_t bonding_store_xmit_hash(struct device *d,
 381                                        struct device_attribute *attr,
 382                                        const char *buf, size_t count)
 383 {
 384         int new_value, ret = count;
 385         struct bonding *bond = to_bond(d);
 386
 387         new_value = bond_parse_parm(buf, xmit_hashtype_tbl);
 388         if (new_value < 0)  {
 389                 pr_err("%s: Ignoring invalid xmit hash policy value %.*s.\n",
 390                        bond->dev->name,
 391                        (int)strlen(buf) - 1, buf);
 392                 ret = -EINVAL;
 393         } else {
 394                 bond->params.xmit_policy = new_value;
 395                 bond_set_mode_ops(bond, bond->params.mode);
 396                 pr_info("%s: setting xmit hash policy to %s (%d).\n",
 397                         bond->dev->name,
 398                         xmit_hashtype_tbl[new_value].modename, new_value);
 399         }
 400
 401         return ret;
 402 }
 403 static DEVICE_ATTR(xmit_hash_policy, S_IRUGO | S_IWUSR,
 404                    bonding_show_xmit_hash, bonding_store_xmit_hash);
 405
 406 /*
 407  * Show and set arp_validate.
 408  */
 409 static ssize_t bonding_show_arp_validate(struct device *d,
 410                                          struct device_attribute *attr,
 411                                          char *buf)
 412 {
 413         struct bonding *bond = to_bond(d);
 414
 415         return sprintf(buf, "%s %d\n",
 416                        arp_validate_tbl[bond->params.arp_validate].modename,
 417                        bond->params.arp_validate);
 418 }
 419
 420 static ssize_t bonding_store_arp_validate(struct device *d,
 421                                           struct device_attribute *attr,
 422                                           const char *buf, size_t count)
 423 {
 424         struct bonding *bond = to_bond(d);
 425         int new_value, ret = count;
 426
 427         if (!rtnl_trylock())
 428                 return restart_syscall();
 429         new_value = bond_parse_parm(buf, arp_validate_tbl);
 430         if (new_value < 0) {
 431                 pr_err("%s: Ignoring invalid arp_validate value %s\n",
 432                        bond->dev->name, buf);
 433                 ret = -EINVAL;
 434                 goto out;
 435         }
 436         if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
 437                 pr_err("%s: arp_validate only supported in active-backup mode.\n",
 438                        bond->dev->name);
 439                 ret = -EINVAL;
 440                 goto out;
 441         }
 442         pr_info("%s: setting arp_validate to %s (%d).\n",
 443                 bond->dev->name, arp_validate_tbl[new_value].modename,
 444                 new_value);
 445
 446         if (bond->dev->flags & IFF_UP) {
 447                 if (!new_value)
 448                         bond->recv_probe = NULL;
 449                 else if (bond->params.arp_interval)
 450                         bond->recv_probe = bond_arp_rcv;
 451         }
 452         bond->params.arp_validate = new_value;
 453 out:
 454         rtnl_unlock();
 455
 456         return ret;
 457 }
 458
 459 static DEVICE_ATTR(arp_validate, S_IRUGO | S_IWUSR, bonding_show_arp_validate,
 460                    bonding_store_arp_validate);
 461 /*
 462  * Show and set arp_all_targets.
 463  */
 464 static ssize_t bonding_show_arp_all_targets(struct device *d,
 465                                          struct device_attribute *attr,
 466                                          char *buf)
 467 {
 468         struct bonding *bond = to_bond(d);
 469         int value = bond->params.arp_all_targets;
 470
 471         return sprintf(buf, "%s %d\n", arp_all_targets_tbl[value].modename,
 472                        value);
 473 }
 474
 475 static ssize_t bonding_store_arp_all_targets(struct device *d,
 476                                           struct device_attribute *attr,
 477                                           const char *buf, size_t count)
 478 {
 479         struct bonding *bond = to_bond(d);
 480         int new_value;
 481
 482         new_value = bond_parse_parm(buf, arp_all_targets_tbl);
 483         if (new_value < 0) {
 484                 pr_err("%s: Ignoring invalid arp_all_targets value %s\n",
 485                        bond->dev->name, buf);
 486                 return -EINVAL;
 487         }
 488         pr_info("%s: setting arp_all_targets to %s (%d).\n",
 489                 bond->dev->name, arp_all_targets_tbl[new_value].modename,
 490                 new_value);
 491
 492         bond->params.arp_all_targets = new_value;
 493
 494         return count;
 495 }
 496
 497 static DEVICE_ATTR(arp_all_targets, S_IRUGO | S_IWUSR,
 498                    bonding_show_arp_all_targets, bonding_store_arp_all_targets);
 499
 500 /*
 501  * Show and store fail_over_mac.  User only allowed to change the
 502  * value when there are no slaves.
 503  */
 504 static ssize_t bonding_show_fail_over_mac(struct device *d,
 505                                           struct device_attribute *attr,
 506                                           char *buf)
 507 {
 508         struct bonding *bond = to_bond(d);
 509
 510         return sprintf(buf, "%s %d\n",
 511                        fail_over_mac_tbl[bond->params.fail_over_mac].modename,
 512                        bond->params.fail_over_mac);
 513 }
 514
 515 static ssize_t bonding_store_fail_over_mac(struct device *d,
 516                                            struct device_attribute *attr,
 517                                            const char *buf, size_t count)
 518 {
 519         int new_value, ret = count;
 520         struct bonding *bond = to_bond(d);
 521
 522         if (!rtnl_trylock())
 523                 return restart_syscall();
 524
 525         if (!list_empty(&bond->slave_list)) {
 526                 pr_err("%s: Can't alter fail_over_mac with slaves in bond.\n",
 527                        bond->dev->name);
 528                 ret = -EPERM;
 529                 goto out;
 530         }
 531
 532         new_value = bond_parse_parm(buf, fail_over_mac_tbl);
 533         if (new_value < 0) {
 534                 pr_err("%s: Ignoring invalid fail_over_mac value %s.\n",
 535                        bond->dev->name, buf);
 536                 ret = -EINVAL;
 537                 goto out;
 538         }
 539
 540         bond->params.fail_over_mac = new_value;
 541         pr_info("%s: Setting fail_over_mac to %s (%d).\n",
 542                 bond->dev->name, fail_over_mac_tbl[new_value].modename,
 543                 new_value);
 544
 545 out:
 546         rtnl_unlock();
 547         return ret;
 548 }
 549
 550 static DEVICE_ATTR(fail_over_mac, S_IRUGO | S_IWUSR,
 551                    bonding_show_fail_over_mac, bonding_store_fail_over_mac);
 552
 553 /*
 554  * Show and set the arp timer interval.  There are two tricky bits
 555  * here.  First, if ARP monitoring is activated, then we must disable
 556  * MII monitoring.  Second, if the ARP timer isn't running, we must
 557  * start it.
 558  */
 559 static ssize_t bonding_show_arp_interval(struct device *d,
 560                                          struct device_attribute *attr,
 561                                          char *buf)
 562 {
 563         struct bonding *bond = to_bond(d);
 564
 565         return sprintf(buf, "%d\n", bond->params.arp_interval);
 566 }
 567
 568 static ssize_t bonding_store_arp_interval(struct device *d,
 569                                           struct device_attribute *attr,
 570                                           const char *buf, size_t count)
 571 {
 572         struct bonding *bond = to_bond(d);
 573         int new_value, ret = count;
 574
 575         if (!rtnl_trylock())
 576                 return restart_syscall();
 577         if (sscanf(buf, "%d", &new_value) != 1) {
 578                 pr_err("%s: no arp_interval value specified.\n",
 579                        bond->dev->name);
 580                 ret = -EINVAL;
 581                 goto out;
 582         }
 583         if (new_value < 0) {
 584                 pr_err("%s: Invalid arp_interval value %d not in range 0-%d; rejected.\n",
 585                        bond->dev->name, new_value, INT_MAX);
 586                 ret = -EINVAL;
 587                 goto out;
 588         }
 589         if (bond->params.mode == BOND_MODE_ALB ||
 590             bond->params.mode == BOND_MODE_TLB) {
 591                 pr_info("%s: ARP monitoring cannot be used with ALB/TLB. Only MII monitoring is supported on %s.\n",
 592                         bond->dev->name, bond->dev->name);
 593                 ret = -EINVAL;
 594                 goto out;
 595         }
 596         pr_info("%s: Setting ARP monitoring interval to %d.\n",
 597                 bond->dev->name, new_value);
 598         bond->params.arp_interval = new_value;
 599         if (new_value) {
 600                 if (bond->params.miimon) {
 601                         pr_info("%s: ARP monitoring cannot be used with MII monitoring. %s Disabling MII monitoring.\n",
 602                                 bond->dev->name, bond->dev->name);
 603                         bond->params.miimon = 0;
 604                 }
 605                 if (!bond->params.arp_targets[0])
 606                         pr_info("%s: ARP monitoring has been set up, but no ARP targets have been specified.\n",
 607                                 bond->dev->name);
 608         }
 609         if (bond->dev->flags & IFF_UP) {
 610                 /* If the interface is up, we may need to fire off
 611                  * the ARP timer.  If the interface is down, the
 612                  * timer will get fired off when the open function
 613                  * is called.
 614                  */
 615                 if (!new_value) {
 616                         if (bond->params.arp_validate)
 617                                 bond->recv_probe = NULL;
 618                         cancel_delayed_work_sync(&bond->arp_work);
 619                 } else {
 620                         /* arp_validate can be set only in active-backup mode */
 621                         if (bond->params.arp_validate)
 622                                 bond->recv_probe = bond_arp_rcv;
 623                         cancel_delayed_work_sync(&bond->mii_work);
 624                         queue_delayed_work(bond->wq, &bond->arp_work, 0);
 625                 }
 626         }
 627 out:
 628         rtnl_unlock();
 629         return ret;
 630 }
 631 static DEVICE_ATTR(arp_interval, S_IRUGO | S_IWUSR,
 632                    bonding_show_arp_interval, bonding_store_arp_interval);
 633
 634 /*
 635  * Show and set the arp targets.
 636  */
 637 static ssize_t bonding_show_arp_targets(struct device *d,
 638                                         struct device_attribute *attr,
 639                                         char *buf)
 640 {
 641         int i, res = 0;
 642         struct bonding *bond = to_bond(d);
 643
 644         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) {
 645                 if (bond->params.arp_targets[i])
 646                         res += sprintf(buf + res, "%pI4 ",
 647                                        &bond->params.arp_targets[i]);
 648         }
 649         if (res)
 650                 buf[res-1] = '\n'; /* eat the leftover space */
 651         return res;
 652 }
 653
 654 static ssize_t bonding_store_arp_targets(struct device *d,
 655                                          struct device_attribute *attr,
 656                                          const char *buf, size_t count)
 657 {
 658         struct bonding *bond = to_bond(d);
 659         struct slave *slave;
 660         __be32 newtarget, *targets;
 661         unsigned long *targets_rx;
 662         int ind, i, j, ret = -EINVAL;
 663
 664         targets = bond->params.arp_targets;
 665         newtarget = in_aton(buf + 1);
 666         /* look for adds */
 667         if (buf[0] == '+') {
 668                 if ((newtarget == 0) || (newtarget == htonl(INADDR_BROADCAST))) {
 669                         pr_err("%s: invalid ARP target %pI4 specified for addition\n",
 670                                bond->dev->name, &newtarget);
 671                         goto out;
 672                 }
 673
 674                 if (bond_get_targets_ip(targets, newtarget) != -1) { /* dup */
 675                         pr_err("%s: ARP target %pI4 is already present\n",
 676                                bond->dev->name, &newtarget);
 677                         goto out;
 678                 }
 679
 680                 ind = bond_get_targets_ip(targets, 0); /* first free slot */
 681                 if (ind == -1) {
 682                         pr_err("%s: ARP target table is full!\n",
 683                                bond->dev->name);
 684                         goto out;
 685                 }
 686
 687                 pr_info("%s: adding ARP target %pI4.\n", bond->dev->name,
 688                          &newtarget);
 689                 /* not to race with bond_arp_rcv */
 690                 write_lock_bh(&bond->lock);
 691                 bond_for_each_slave(bond, slave)
 692                         slave->target_last_arp_rx[ind] = jiffies;
 693                 targets[ind] = newtarget;
 694                 write_unlock_bh(&bond->lock);
 695         } else if (buf[0] == '-')       {
 696                 if ((newtarget == 0) || (newtarget == htonl(INADDR_BROADCAST))) {
 697                         pr_err("%s: invalid ARP target %pI4 specified for removal\n",
 698                                bond->dev->name, &newtarget);
 699                         goto out;
 700                 }
 701
 702                 ind = bond_get_targets_ip(targets, newtarget);
 703                 if (ind == -1) {
 704                         pr_err("%s: unable to remove nonexistent ARP target %pI4.\n",
 705                                 bond->dev->name, &newtarget);
 706                         goto out;
 707                 }
 708
 709                 if (ind == 0 && !targets[1] && bond->params.arp_interval)
 710                         pr_warn("%s: removing last arp target with arp_interval on\n",
 711                                 bond->dev->name);
 712
 713                 pr_info("%s: removing ARP target %pI4.\n", bond->dev->name,
 714                         &newtarget);
 715
 716                 write_lock_bh(&bond->lock);
 717                 bond_for_each_slave(bond, slave) {
 718                         targets_rx = slave->target_last_arp_rx;
 719                         j = ind;
 720                         for (; (j < BOND_MAX_ARP_TARGETS-1) && targets[j+1]; j++)
 721                                 targets_rx[j] = targets_rx[j+1];
 722                         targets_rx[j] = 0;
 723                 }
 724                 for (i = ind; (i < BOND_MAX_ARP_TARGETS-1) && targets[i+1]; i++)
 725                         targets[i] = targets[i+1];
 726                 targets[i] = 0;
 727                 write_unlock_bh(&bond->lock);
 728         } else {
 729                 pr_err("no command found in arp_ip_targets file for bond %s. Use +<addr> or -<addr>.\n",
 730                        bond->dev->name);
 731                 ret = -EPERM;
 732                 goto out;
 733         }
 734
 735         ret = count;
 736 out:
 737         return ret;
 738 }
 739 static DEVICE_ATTR(arp_ip_target, S_IRUGO | S_IWUSR , bonding_show_arp_targets, bonding_store_arp_targets);
 740
 741 /*
 742  * Show and set the up and down delays.  These must be multiples of the
 743  * MII monitoring value, and are stored internally as the multiplier.
 744  * Thus, we must translate to MS for the real world.
 745  */
 746 static ssize_t bonding_show_downdelay(struct device *d,
 747                                       struct device_attribute *attr,
 748                                       char *buf)
 749 {
 750         struct bonding *bond = to_bond(d);
 751
 752         return sprintf(buf, "%d\n", bond->params.downdelay * bond->params.miimon);
 753 }
 754
 755 static ssize_t bonding_store_downdelay(struct device *d,
 756                                        struct device_attribute *attr,
 757                                        const char *buf, size_t count)
 758 {
 759         int new_value, ret = count;
 760         struct bonding *bond = to_bond(d);
 761
 762         if (!(bond->params.miimon)) {
 763                 pr_err("%s: Unable to set down delay as MII monitoring is disabled\n",
 764                        bond->dev->name);
 765                 ret = -EPERM;
 766                 goto out;
 767         }
 768
 769         if (sscanf(buf, "%d", &new_value) != 1) {
 770                 pr_err("%s: no down delay value specified.\n", bond->dev->name);
 771                 ret = -EINVAL;
 772                 goto out;
 773         }
 774         if (new_value < 0) {
 775                 pr_err("%s: Invalid down delay value %d not in range %d-%d; rejected.\n",
 776                        bond->dev->name, new_value, 0, INT_MAX);
 777                 ret = -EINVAL;
 778                 goto out;
 779         } else {
 780                 if ((new_value % bond->params.miimon) != 0) {
 781                         pr_warning("%s: Warning: down delay (%d) is not a multiple of miimon (%d), delay rounded to %d ms\n",
 782                                    bond->dev->name, new_value,
 783                                    bond->params.miimon,
 784                                    (new_value / bond->params.miimon) *
 785                                    bond->params.miimon);
 786                 }
 787                 bond->params.downdelay = new_value / bond->params.miimon;
 788                 pr_info("%s: Setting down delay to %d.\n",
 789                         bond->dev->name,
 790                         bond->params.downdelay * bond->params.miimon);
 791
 792         }
 793
 794 out:
 795         return ret;
 796 }
 797 static DEVICE_ATTR(downdelay, S_IRUGO | S_IWUSR,
 798                    bonding_show_downdelay, bonding_store_downdelay);
 799
 800 static ssize_t bonding_show_updelay(struct device *d,
 801                                     struct device_attribute *attr,
 802                                     char *buf)
 803 {
 804         struct bonding *bond = to_bond(d);
 805
 806         return sprintf(buf, "%d\n", bond->params.updelay * bond->params.miimon);
 807
 808 }
 809
 810 static ssize_t bonding_store_updelay(struct device *d,
 811                                      struct device_attribute *attr,
 812                                      const char *buf, size_t count)
 813 {
 814         int new_value, ret = count;
 815         struct bonding *bond = to_bond(d);
 816
 817         if (!(bond->params.miimon)) {
 818                 pr_err("%s: Unable to set up delay as MII monitoring is disabled\n",
 819                        bond->dev->name);
 820                 ret = -EPERM;
 821                 goto out;
 822         }
 823
 824         if (sscanf(buf, "%d", &new_value) != 1) {
 825                 pr_err("%s: no up delay value specified.\n",
 826                        bond->dev->name);
 827                 ret = -EINVAL;
 828                 goto out;
 829         }
 830         if (new_value < 0) {
 831                 pr_err("%s: Invalid up delay value %d not in range %d-%d; rejected.\n",
 832                        bond->dev->name, new_value, 0, INT_MAX);
 833                 ret = -EINVAL;
 834                 goto out;
 835         } else {
 836                 if ((new_value % bond->params.miimon) != 0) {
 837                         pr_warning("%s: Warning: up delay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
 838                                    bond->dev->name, new_value,
 839                                    bond->params.miimon,
 840                                    (new_value / bond->params.miimon) *
 841                                    bond->params.miimon);
 842                 }
 843                 bond->params.updelay = new_value / bond->params.miimon;
 844                 pr_info("%s: Setting up delay to %d.\n",
 845                         bond->dev->name,
 846                         bond->params.updelay * bond->params.miimon);
 847         }
 848
 849 out:
 850         return ret;
 851 }
 852 static DEVICE_ATTR(updelay, S_IRUGO | S_IWUSR,
 853                    bonding_show_updelay, bonding_store_updelay);
 854
 855 /*
 856  * Show and set the LACP interval.  Interface must be down, and the mode
 857  * must be set to 802.3ad mode.
 858  */
 859 static ssize_t bonding_show_lacp(struct device *d,
 860                                  struct device_attribute *attr,
 861                                  char *buf)
 862 {
 863         struct bonding *bond = to_bond(d);
 864
 865         return sprintf(buf, "%s %d\n",
 866                 bond_lacp_tbl[bond->params.lacp_fast].modename,
 867                 bond->params.lacp_fast);
 868 }
 869
 870 static ssize_t bonding_store_lacp(struct device *d,
 871                                   struct device_attribute *attr,
 872                                   const char *buf, size_t count)
 873 {
 874         struct bonding *bond = to_bond(d);
 875         int new_value, ret = count;
 876
 877         if (!rtnl_trylock())
 878                 return restart_syscall();
 879
 880         if (bond->dev->flags & IFF_UP) {
 881                 pr_err("%s: Unable to update LACP rate because interface is up.\n",
 882                        bond->dev->name);
 883                 ret = -EPERM;
 884                 goto out;
 885         }
 886
 887         if (bond->params.mode != BOND_MODE_8023AD) {
 888                 pr_err("%s: Unable to update LACP rate because bond is not in 802.3ad mode.\n",
 889                        bond->dev->name);
 890                 ret = -EPERM;
 891                 goto out;
 892         }
 893
 894         new_value = bond_parse_parm(buf, bond_lacp_tbl);
 895
 896         if ((new_value == 1) || (new_value == 0)) {
 897                 bond->params.lacp_fast = new_value;
 898                 bond_3ad_update_lacp_rate(bond);
 899                 pr_info("%s: Setting LACP rate to %s (%d).\n",
 900                         bond->dev->name, bond_lacp_tbl[new_value].modename,
 901                         new_value);
 902         } else {
 903                 pr_err("%s: Ignoring invalid LACP rate value %.*s.\n",
 904                        bond->dev->name, (int)strlen(buf) - 1, buf);
 905                 ret = -EINVAL;
 906         }
 907 out:
 908         rtnl_unlock();
 909
 910         return ret;
 911 }
 912 static DEVICE_ATTR(lacp_rate, S_IRUGO | S_IWUSR,
 913                    bonding_show_lacp, bonding_store_lacp);
 914
 915 static ssize_t bonding_show_min_links(struct device *d,
 916                                       struct device_attribute *attr,
 917                                       char *buf)
 918 {
 919         struct bonding *bond = to_bond(d);
 920
 921         return sprintf(buf, "%d\n", bond->params.min_links);
 922 }
 923
 924 static ssize_t bonding_store_min_links(struct device *d,
 925                                        struct device_attribute *attr,
 926                                        const char *buf, size_t count)
 927 {
 928         struct bonding *bond = to_bond(d);
 929         int ret;
 930         unsigned int new_value;
 931
 932         ret = kstrtouint(buf, 0, &new_value);
 933         if (ret < 0) {
 934                 pr_err("%s: Ignoring invalid min links value %s.\n",
 935                        bond->dev->name, buf);
 936                 return ret;
 937         }
 938
 939         pr_info("%s: Setting min links value to %u\n",
 940                 bond->dev->name, new_value);
 941         bond->params.min_links = new_value;
 942         return count;
 943 }
 944 static DEVICE_ATTR(min_links, S_IRUGO | S_IWUSR,
 945                    bonding_show_min_links, bonding_store_min_links);
 946
 947 static ssize_t bonding_show_ad_select(struct device *d,
 948                                       struct device_attribute *attr,
 949                                       char *buf)
 950 {
 951         struct bonding *bond = to_bond(d);
 952
 953         return sprintf(buf, "%s %d\n",
 954                 ad_select_tbl[bond->params.ad_select].modename,
 955                 bond->params.ad_select);
 956 }
 957
 958
 959 static ssize_t bonding_store_ad_select(struct device *d,
 960                                        struct device_attribute *attr,
 961                                        const char *buf, size_t count)
 962 {
 963         int new_value, ret = count;
 964         struct bonding *bond = to_bond(d);
 965
 966         if (bond->dev->flags & IFF_UP) {
 967                 pr_err("%s: Unable to update ad_select because interface is up.\n",
 968                        bond->dev->name);
 969                 ret = -EPERM;
 970                 goto out;
 971         }
 972
 973         new_value = bond_parse_parm(buf, ad_select_tbl);
 974
 975         if (new_value != -1) {
 976                 bond->params.ad_select = new_value;
 977                 pr_info("%s: Setting ad_select to %s (%d).\n",
 978                         bond->dev->name, ad_select_tbl[new_value].modename,
 979                         new_value);
 980         } else {
 981                 pr_err("%s: Ignoring invalid ad_select value %.*s.\n",
 982                        bond->dev->name, (int)strlen(buf) - 1, buf);
 983                 ret = -EINVAL;
 984         }
 985 out:
 986         return ret;
 987 }
 988 static DEVICE_ATTR(ad_select, S_IRUGO | S_IWUSR,
 989                    bonding_show_ad_select, bonding_store_ad_select);
 990
 991 /*
 992  * Show and set the number of peer notifications to send after a failover event.
 993  */
 994 static ssize_t bonding_show_num_peer_notif(struct device *d,
 995                                            struct device_attribute *attr,
 996                                            char *buf)
 997 {
 998         struct bonding *bond = to_bond(d);
 999         return sprintf(buf, "%d\n", bond->params.num_peer_notif);
1000 }
1001
1002 static ssize_t bonding_store_num_peer_notif(struct device *d,
1003                                             struct device_attribute *attr,
1004                                             const char *buf, size_t count)
1005 {
1006         struct bonding *bond = to_bond(d);
1007         int err = kstrtou8(buf, 10, &bond->params.num_peer_notif);
1008         return err ? err : count;
1009 }
1010 static DEVICE_ATTR(num_grat_arp, S_IRUGO | S_IWUSR,
1011                    bonding_show_num_peer_notif, bonding_store_num_peer_notif);
1012 static DEVICE_ATTR(num_unsol_na, S_IRUGO | S_IWUSR,
1013                    bonding_show_num_peer_notif, bonding_store_num_peer_notif);
1014
1015 /*
1016  * Show and set the MII monitor interval.  There are two tricky bits
1017  * here.  First, if MII monitoring is activated, then we must disable
1018  * ARP monitoring.  Second, if the timer isn't running, we must
1019  * start it.
1020  */
1021 static ssize_t bonding_show_miimon(struct device *d,
1022                                    struct device_attribute *attr,
1023                                    char *buf)
1024 {
1025         struct bonding *bond = to_bond(d);
1026
1027         return sprintf(buf, "%d\n", bond->params.miimon);
1028 }
1029
1030 static ssize_t bonding_store_miimon(struct device *d,
1031                                     struct device_attribute *attr,
1032                                     const char *buf, size_t count)
1033 {
1034         int new_value, ret = count;
1035         struct bonding *bond = to_bond(d);
1036
1037         if (!rtnl_trylock())
1038                 return restart_syscall();
1039         if (sscanf(buf, "%d", &new_value) != 1) {
1040                 pr_err("%s: no miimon value specified.\n",
1041                        bond->dev->name);
1042                 ret = -EINVAL;
1043                 goto out;
1044         }
1045         if (new_value < 0) {
1046                 pr_err("%s: Invalid miimon value %d not in range %d-%d; rejected.\n",
1047                        bond->dev->name, new_value, 0, INT_MAX);
1048                 ret = -EINVAL;
1049                 goto out;
1050         }
1051         pr_info("%s: Setting MII monitoring interval to %d.\n",
1052                 bond->dev->name, new_value);
1053         bond->params.miimon = new_value;
1054         if (bond->params.updelay)
1055                 pr_info("%s: Note: Updating updelay (to %d) since it is a multiple of the miimon value.\n",
1056                         bond->dev->name,
1057                         bond->params.updelay * bond->params.miimon);
1058         if (bond->params.downdelay)
1059                 pr_info("%s: Note: Updating downdelay (to %d) since it is a multiple of the miimon value.\n",
1060                         bond->dev->name,
1061                         bond->params.downdelay * bond->params.miimon);
1062         if (new_value && bond->params.arp_interval) {
1063                 pr_info("%s: MII monitoring cannot be used with ARP monitoring. Disabling ARP monitoring...\n",
1064                         bond->dev->name);
1065                 bond->params.arp_interval = 0;
1066                 if (bond->params.arp_validate)
1067                         bond->params.arp_validate = BOND_ARP_VALIDATE_NONE;
1068         }
1069         if (bond->dev->flags & IFF_UP) {
1070                 /* If the interface is up, we may need to fire off
1071                  * the MII timer. If the interface is down, the
1072                  * timer will get fired off when the open function
1073                  * is called.
1074                  */
1075                 if (!new_value) {
1076                         cancel_delayed_work_sync(&bond->mii_work);
1077                 } else {
1078                         cancel_delayed_work_sync(&bond->arp_work);
1079                         queue_delayed_work(bond->wq, &bond->mii_work, 0);
1080                 }
1081         }
1082 out:
1083         rtnl_unlock();
1084         return ret;
1085 }
1086 static DEVICE_ATTR(miimon, S_IRUGO | S_IWUSR,
1087                    bonding_show_miimon, bonding_store_miimon);
1088
1089 /*
1090  * Show and set the primary slave.  The store function is much
1091  * simpler than bonding_store_slaves function because it only needs to
1092  * handle one interface name.
1093  * The bond must be a mode that supports a primary for this be
1094  * set.
1095  */
1096 static ssize_t bonding_show_primary(struct device *d,
1097                                     struct device_attribute *attr,
1098                                     char *buf)
1099 {
1100         int count = 0;
1101         struct bonding *bond = to_bond(d);
1102
1103         if (bond->primary_slave)
1104                 count = sprintf(buf, "%s\n", bond->primary_slave->dev->name);
1105
1106         return count;
1107 }
1108
1109 static ssize_t bonding_store_primary(struct device *d,
1110                                      struct device_attribute *attr,
1111                                      const char *buf, size_t count)
1112 {
1113         struct bonding *bond = to_bond(d);
1114         char ifname[IFNAMSIZ];
1115         struct slave *slave;
1116
1117         if (!rtnl_trylock())
1118                 return restart_syscall();
1119         block_netpoll_tx();
1120         read_lock(&bond->lock);
1121         write_lock_bh(&bond->curr_slave_lock);
1122
1123         if (!USES_PRIMARY(bond->params.mode)) {
1124                 pr_info("%s: Unable to set primary slave; %s is in mode %d\n",
1125                         bond->dev->name, bond->dev->name, bond->params.mode);
1126                 goto out;
1127         }
1128
1129         sscanf(buf, "%15s", ifname); /* IFNAMSIZ */
1130
1131         /* check to see if we are clearing primary */
1132         if (!strlen(ifname) || buf[0] == '\n') {
1133                 pr_info("%s: Setting primary slave to None.\n",
1134                         bond->dev->name);
1135                 bond->primary_slave = NULL;
1136                 memset(bond->params.primary, 0, sizeof(bond->params.primary));
1137                 bond_select_active_slave(bond);
1138                 goto out;
1139         }
1140
1141         bond_for_each_slave(bond, slave) {
1142                 if (strncmp(slave->dev->name, ifname, IFNAMSIZ) == 0) {
1143                         pr_info("%s: Setting %s as primary slave.\n",
1144                                 bond->dev->name, slave->dev->name);
1145                         bond->primary_slave = slave;
1146                         strcpy(bond->params.primary, slave->dev->name);
1147                         bond_select_active_slave(bond);
1148                         goto out;
1149                 }
1150         }
1151
1152         strncpy(bond->params.primary, ifname, IFNAMSIZ);
1153         bond->params.primary[IFNAMSIZ - 1] = 0;
1154
1155         pr_info("%s: Recording %s as primary, "
1156                 "but it has not been enslaved to %s yet.\n",
1157                 bond->dev->name, ifname, bond->dev->name);
1158 out:
1159         write_unlock_bh(&bond->curr_slave_lock);
1160         read_unlock(&bond->lock);
1161         unblock_netpoll_tx();
1162         rtnl_unlock();
1163
1164         return count;
1165 }
1166 static DEVICE_ATTR(primary, S_IRUGO | S_IWUSR,
1167                    bonding_show_primary, bonding_store_primary);
1168
1169 /*
1170  * Show and set the primary_reselect flag.
1171  */
1172 static ssize_t bonding_show_primary_reselect(struct device *d,
1173                                              struct device_attribute *attr,
1174                                              char *buf)
1175 {
1176         struct bonding *bond = to_bond(d);
1177
1178         return sprintf(buf, "%s %d\n",
1179                        pri_reselect_tbl[bond->params.primary_reselect].modename,
1180                        bond->params.primary_reselect);
1181 }
1182
1183 static ssize_t bonding_store_primary_reselect(struct device *d,
1184                                               struct device_attribute *attr,
1185                                               const char *buf, size_t count)
1186 {
1187         int new_value, ret = count;
1188         struct bonding *bond = to_bond(d);
1189
1190         if (!rtnl_trylock())
1191                 return restart_syscall();
1192
1193         new_value = bond_parse_parm(buf, pri_reselect_tbl);
1194         if (new_value < 0)  {
1195                 pr_err("%s: Ignoring invalid primary_reselect value %.*s.\n",
1196                        bond->dev->name,
1197                        (int) strlen(buf) - 1, buf);
1198                 ret = -EINVAL;
1199                 goto out;
1200         }
1201
1202         bond->params.primary_reselect = new_value;
1203         pr_info("%s: setting primary_reselect to %s (%d).\n",
1204                 bond->dev->name, pri_reselect_tbl[new_value].modename,
1205                 new_value);
1206
1207         block_netpoll_tx();
1208         read_lock(&bond->lock);
1209         write_lock_bh(&bond->curr_slave_lock);
1210         bond_select_active_slave(bond);
1211         write_unlock_bh(&bond->curr_slave_lock);
1212         read_unlock(&bond->lock);
1213         unblock_netpoll_tx();
1214 out:
1215         rtnl_unlock();
1216         return ret;
1217 }
1218 static DEVICE_ATTR(primary_reselect, S_IRUGO | S_IWUSR,
1219                    bonding_show_primary_reselect,
1220                    bonding_store_primary_reselect);
1221
1222 /*
1223  * Show and set the use_carrier flag.
1224  */
1225 static ssize_t bonding_show_carrier(struct device *d,
1226                                     struct device_attribute *attr,
1227                                     char *buf)
1228 {
1229         struct bonding *bond = to_bond(d);
1230
1231         return sprintf(buf, "%d\n", bond->params.use_carrier);
1232 }
1233
1234 static ssize_t bonding_store_carrier(struct device *d,
1235                                      struct device_attribute *attr,
1236                                      const char *buf, size_t count)
1237 {
1238         int new_value, ret = count;
1239         struct bonding *bond = to_bond(d);
1240
1241
1242         if (sscanf(buf, "%d", &new_value) != 1) {
1243                 pr_err("%s: no use_carrier value specified.\n",
1244                        bond->dev->name);
1245                 ret = -EINVAL;
1246                 goto out;
1247         }
1248         if ((new_value == 0) || (new_value == 1)) {
1249                 bond->params.use_carrier = new_value;
1250                 pr_info("%s: Setting use_carrier to %d.\n",
1251                         bond->dev->name, new_value);
1252         } else {
1253                 pr_info("%s: Ignoring invalid use_carrier value %d.\n",
1254                         bond->dev->name, new_value);
1255         }
1256 out:
1257         return ret;
1258 }
1259 static DEVICE_ATTR(use_carrier, S_IRUGO | S_IWUSR,
1260                    bonding_show_carrier, bonding_store_carrier);
1261
1262
1263 /*
1264  * Show and set currently active_slave.
1265  */
1266 static ssize_t bonding_show_active_slave(struct device *d,
1267                                          struct device_attribute *attr,
1268                                          char *buf)
1269 {
1270         struct bonding *bond = to_bond(d);
1271         struct slave *curr;
1272         int count = 0;
1273
1274         rcu_read_lock();
1275         curr = rcu_dereference(bond->curr_active_slave);
1276         if (USES_PRIMARY(bond->params.mode) && curr)
1277                 count = sprintf(buf, "%s\n", curr->dev->name);
1278         rcu_read_unlock();
1279
1280         return count;
1281 }
1282
1283 static ssize_t bonding_store_active_slave(struct device *d,
1284                                           struct device_attribute *attr,
1285                                           const char *buf, size_t count)
1286 {
1287         struct slave *slave, *old_active, *new_active;
1288         struct bonding *bond = to_bond(d);
1289         char ifname[IFNAMSIZ];
1290
1291         if (!rtnl_trylock())
1292                 return restart_syscall();
1293
1294         old_active = new_active = NULL;
1295         block_netpoll_tx();
1296         read_lock(&bond->lock);
1297         write_lock_bh(&bond->curr_slave_lock);
1298
1299         if (!USES_PRIMARY(bond->params.mode)) {
1300                 pr_info("%s: Unable to change active slave; %s is in mode %d\n",
1301                         bond->dev->name, bond->dev->name, bond->params.mode);
1302                 goto out;
1303         }
1304
1305         sscanf(buf, "%15s", ifname); /* IFNAMSIZ */
1306
1307         /* check to see if we are clearing active */
1308         if (!strlen(ifname) || buf[0] == '\n') {
1309                 pr_info("%s: Clearing current active slave.\n",
1310                         bond->dev->name);
1311                 rcu_assign_pointer(bond->curr_active_slave, NULL);
1312                 bond_select_active_slave(bond);
1313                 goto out;
1314         }
1315
1316         bond_for_each_slave(bond, slave) {
1317                 if (strncmp(slave->dev->name, ifname, IFNAMSIZ) == 0) {
1318                         old_active = bond->curr_active_slave;
1319                         new_active = slave;
1320                         if (new_active == old_active) {
1321                                 /* do nothing */
1322                                 pr_info("%s: %s is already the current"
1323                                         " active slave.\n",
1324                                         bond->dev->name,
1325                                         slave->dev->name);
1326                                 goto out;
1327                         } else {
1328                                 if ((new_active) &&
1329                                     (old_active) &&
1330                                     (new_active->link == BOND_LINK_UP) &&
1331                                     IS_UP(new_active->dev)) {
1332                                         pr_info("%s: Setting %s as active"
1333                                                 " slave.\n",
1334                                                 bond->dev->name,
1335                                                 slave->dev->name);
1336                                         bond_change_active_slave(bond,
1337                                                                  new_active);
1338                                 } else {
1339                                         pr_info("%s: Could not set %s as"
1340                                                 " active slave; either %s is"
1341                                                 " down or the link is down.\n",
1342                                                 bond->dev->name,
1343                                                 slave->dev->name,
1344                                                 slave->dev->name);
1345                                 }
1346                                 goto out;
1347                         }
1348                 }
1349         }
1350
1351         pr_info("%s: Unable to set %.*s as active slave.\n",
1352                 bond->dev->name, (int)strlen(buf) - 1, buf);
1353  out:
1354         write_unlock_bh(&bond->curr_slave_lock);
1355         read_unlock(&bond->lock);
1356         unblock_netpoll_tx();
1357
1358         rtnl_unlock();
1359
1360         return count;
1361
1362 }
1363 static DEVICE_ATTR(active_slave, S_IRUGO | S_IWUSR,
1364                    bonding_show_active_slave, bonding_store_active_slave);
1365
1366
1367 /*
1368  * Show link status of the bond interface.
1369  */
1370 static ssize_t bonding_show_mii_status(struct device *d,
1371                                        struct device_attribute *attr,
1372                                        char *buf)
1373 {
1374         struct bonding *bond = to_bond(d);
1375
1376         return sprintf(buf, "%s\n", bond->curr_active_slave ? "up" : "down");
1377 }
1378 static DEVICE_ATTR(mii_status, S_IRUGO, bonding_show_mii_status, NULL);
1379
1380 /*
1381  * Show current 802.3ad aggregator ID.
1382  */
1383 static ssize_t bonding_show_ad_aggregator(struct device *d,
1384                                           struct device_attribute *attr,
1385                                           char *buf)
1386 {
1387         int count = 0;
1388         struct bonding *bond = to_bond(d);
1389
1390         if (bond->params.mode == BOND_MODE_8023AD) {
1391                 struct ad_info ad_info;
1392                 count = sprintf(buf, "%d\n",
1393                                 bond_3ad_get_active_agg_info(bond, &ad_info)
1394                                 ?  0 : ad_info.aggregator_id);
1395         }
1396
1397         return count;
1398 }
1399 static DEVICE_ATTR(ad_aggregator, S_IRUGO, bonding_show_ad_aggregator, NULL);
1400
1401
1402 /*
1403  * Show number of active 802.3ad ports.
1404  */
1405 static ssize_t bonding_show_ad_num_ports(struct device *d,
1406                                          struct device_attribute *attr,
1407                                          char *buf)
1408 {
1409         int count = 0;
1410         struct bonding *bond = to_bond(d);
1411
1412         if (bond->params.mode == BOND_MODE_8023AD) {
1413                 struct ad_info ad_info;
1414                 count = sprintf(buf, "%d\n",
1415                                 bond_3ad_get_active_agg_info(bond, &ad_info)
1416                                 ?  0 : ad_info.ports);
1417         }
1418
1419         return count;
1420 }
1421 static DEVICE_ATTR(ad_num_ports, S_IRUGO, bonding_show_ad_num_ports, NULL);
1422
1423
1424 /*
1425  * Show current 802.3ad actor key.
1426  */
1427 static ssize_t bonding_show_ad_actor_key(struct device *d,
1428                                          struct device_attribute *attr,
1429                                          char *buf)
1430 {
1431         int count = 0;
1432         struct bonding *bond = to_bond(d);
1433
1434         if (bond->params.mode == BOND_MODE_8023AD) {
1435                 struct ad_info ad_info;
1436                 count = sprintf(buf, "%d\n",
1437                                 bond_3ad_get_active_agg_info(bond, &ad_info)
1438                                 ?  0 : ad_info.actor_key);
1439         }
1440
1441         return count;
1442 }
1443 static DEVICE_ATTR(ad_actor_key, S_IRUGO, bonding_show_ad_actor_key, NULL);
1444
1445
1446 /*
1447  * Show current 802.3ad partner key.
1448  */
1449 static ssize_t bonding_show_ad_partner_key(struct device *d,
1450                                            struct device_attribute *attr,
1451                                            char *buf)
1452 {
1453         int count = 0;
1454         struct bonding *bond = to_bond(d);
1455
1456         if (bond->params.mode == BOND_MODE_8023AD) {
1457                 struct ad_info ad_info;
1458                 count = sprintf(buf, "%d\n",
1459                                 bond_3ad_get_active_agg_info(bond, &ad_info)
1460                                 ?  0 : ad_info.partner_key);
1461         }
1462
1463         return count;
1464 }
1465 static DEVICE_ATTR(ad_partner_key, S_IRUGO, bonding_show_ad_partner_key, NULL);
1466
1467
1468 /*
1469  * Show current 802.3ad partner mac.
1470  */
1471 static ssize_t bonding_show_ad_partner_mac(struct device *d,
1472                                            struct device_attribute *attr,
1473                                            char *buf)
1474 {
1475         int count = 0;
1476         struct bonding *bond = to_bond(d);
1477
1478         if (bond->params.mode == BOND_MODE_8023AD) {
1479                 struct ad_info ad_info;
1480                 if (!bond_3ad_get_active_agg_info(bond, &ad_info))
1481                         count = sprintf(buf, "%pM\n", ad_info.partner_system);
1482         }
1483
1484         return count;
1485 }
1486 static DEVICE_ATTR(ad_partner_mac, S_IRUGO, bonding_show_ad_partner_mac, NULL);
1487
1488 /*
1489  * Show the queue_ids of the slaves in the current bond.
1490  */
1491 static ssize_t bonding_show_queue_id(struct device *d,
1492                                      struct device_attribute *attr,
1493                                      char *buf)
1494 {
1495         struct bonding *bond = to_bond(d);
1496         struct slave *slave;
1497         int res = 0;
1498
1499         if (!rtnl_trylock())
1500                 return restart_syscall();
1501
1502         read_lock(&bond->lock);
1503         bond_for_each_slave(bond, slave) {
1504                 if (res > (PAGE_SIZE - IFNAMSIZ - 6)) {
1505                         /* not enough space for another interface_name:queue_id pair */
1506                         if ((PAGE_SIZE - res) > 10)
1507                                 res = PAGE_SIZE - 10;
1508                         res += sprintf(buf + res, "++more++ ");
1509                         break;
1510                 }
1511                 res += sprintf(buf + res, "%s:%d ",
1512                                slave->dev->name, slave->queue_id);
1513         }
1514         read_unlock(&bond->lock);
1515         if (res)
1516                 buf[res-1] = '\n'; /* eat the leftover space */
1517         rtnl_unlock();
1518
1519         return res;
1520 }
1521
1522 /*
1523  * Set the queue_ids of the  slaves in the current bond.  The bond
1524  * interface must be enslaved for this to work.
1525  */
1526 static ssize_t bonding_store_queue_id(struct device *d,
1527                                       struct device_attribute *attr,
1528                                       const char *buffer, size_t count)
1529 {
1530         struct slave *slave, *update_slave;
1531         struct bonding *bond = to_bond(d);
1532         u16 qid;
1533         int ret = count;
1534         char *delim;
1535         struct net_device *sdev = NULL;
1536
1537         if (!rtnl_trylock())
1538                 return restart_syscall();
1539
1540         /* delim will point to queue id if successful */
1541         delim = strchr(buffer, ':');
1542         if (!delim)
1543                 goto err_no_cmd;
1544
1545         /*
1546          * Terminate string that points to device name and bump it
1547          * up one, so we can read the queue id there.
1548          */
1549         *delim = '\0';
1550         if (sscanf(++delim, "%hd\n", &qid) != 1)
1551                 goto err_no_cmd;
1552
1553         /* Check buffer length, valid ifname and queue id */
1554         if (strlen(buffer) > IFNAMSIZ ||
1555             !dev_valid_name(buffer) ||
1556             qid > bond->dev->real_num_tx_queues)
1557                 goto err_no_cmd;
1558
1559         /* Get the pointer to that interface if it exists */
1560         sdev = __dev_get_by_name(dev_net(bond->dev), buffer);
1561         if (!sdev)
1562                 goto err_no_cmd;
1563
1564         read_lock(&bond->lock);
1565
1566         /* Search for thes slave and check for duplicate qids */
1567         update_slave = NULL;
1568         bond_for_each_slave(bond, slave) {
1569                 if (sdev == slave->dev)
1570                         /*
1571                          * We don't need to check the matching
1572                          * slave for dups, since we're overwriting it
1573                          */
1574                         update_slave = slave;
1575                 else if (qid && qid == slave->queue_id) {
1576                         goto err_no_cmd_unlock;
1577                 }
1578         }
1579
1580         if (!update_slave)
1581                 goto err_no_cmd_unlock;
1582
1583         /* Actually set the qids for the slave */
1584         update_slave->queue_id = qid;
1585
1586         read_unlock(&bond->lock);
1587 out:
1588         rtnl_unlock();
1589         return ret;
1590
1591 err_no_cmd_unlock:
1592         read_unlock(&bond->lock);
1593 err_no_cmd:
1594         pr_info("invalid input for queue_id set for %s.\n",
1595                 bond->dev->name);
1596         ret = -EPERM;
1597         goto out;
1598 }
1599
1600 static DEVICE_ATTR(queue_id, S_IRUGO | S_IWUSR, bonding_show_queue_id,
1601                    bonding_store_queue_id);
1602
1603
1604 /*
1605  * Show and set the all_slaves_active flag.
1606  */
1607 static ssize_t bonding_show_slaves_active(struct device *d,
1608                                           struct device_attribute *attr,
1609                                           char *buf)
1610 {
1611         struct bonding *bond = to_bond(d);
1612
1613         return sprintf(buf, "%d\n", bond->params.all_slaves_active);
1614 }
1615
1616 static ssize_t bonding_store_slaves_active(struct device *d,
1617                                            struct device_attribute *attr,
1618                                            const char *buf, size_t count)
1619 {
1620         struct bonding *bond = to_bond(d);
1621         int new_value, ret = count;
1622         struct slave *slave;
1623
1624         if (sscanf(buf, "%d", &new_value) != 1) {
1625                 pr_err("%s: no all_slaves_active value specified.\n",
1626                        bond->dev->name);
1627                 ret = -EINVAL;
1628                 goto out;
1629         }
1630
1631         if (new_value == bond->params.all_slaves_active)
1632                 goto out;
1633
1634         if ((new_value == 0) || (new_value == 1)) {
1635                 bond->params.all_slaves_active = new_value;
1636         } else {
1637                 pr_info("%s: Ignoring invalid all_slaves_active value %d.\n",
1638                         bond->dev->name, new_value);
1639                 ret = -EINVAL;
1640                 goto out;
1641         }
1642
1643         read_lock(&bond->lock);
1644         bond_for_each_slave(bond, slave) {
1645                 if (!bond_is_active_slave(slave)) {
1646                         if (new_value)
1647                                 slave->inactive = 0;
1648                         else
1649                                 slave->inactive = 1;
1650                 }
1651         }
1652         read_unlock(&bond->lock);
1653 out:
1654         return ret;
1655 }
1656 static DEVICE_ATTR(all_slaves_active, S_IRUGO | S_IWUSR,
1657                    bonding_show_slaves_active, bonding_store_slaves_active);
1658
1659 /*
1660  * Show and set the number of IGMP membership reports to send on link failure
1661  */
1662 static ssize_t bonding_show_resend_igmp(struct device *d,
1663                                         struct device_attribute *attr,
1664                                         char *buf)
1665 {
1666         struct bonding *bond = to_bond(d);
1667
1668         return sprintf(buf, "%d\n", bond->params.resend_igmp);
1669 }
1670
1671 static ssize_t bonding_store_resend_igmp(struct device *d,
1672                                          struct device_attribute *attr,
1673                                          const char *buf, size_t count)
1674 {
1675         int new_value, ret = count;
1676         struct bonding *bond = to_bond(d);
1677
1678         if (sscanf(buf, "%d", &new_value) != 1) {
1679                 pr_err("%s: no resend_igmp value specified.\n",
1680                        bond->dev->name);
1681                 ret = -EINVAL;
1682                 goto out;
1683         }
1684
1685         if (new_value < 0 || new_value > 255) {
1686                 pr_err("%s: Invalid resend_igmp value %d not in range 0-255; rejected.\n",
1687                        bond->dev->name, new_value);
1688                 ret = -EINVAL;
1689                 goto out;
1690         }
1691
1692         pr_info("%s: Setting resend_igmp to %d.\n",
1693                 bond->dev->name, new_value);
1694         bond->params.resend_igmp = new_value;
1695 out:
1696         return ret;
1697 }
1698
1699 static DEVICE_ATTR(resend_igmp, S_IRUGO | S_IWUSR,
1700                    bonding_show_resend_igmp, bonding_store_resend_igmp);
1701
1702
1703 static ssize_t bonding_show_lp_interval(struct device *d,
1704                                         struct device_attribute *attr,
1705                                         char *buf)
1706 {
1707         struct bonding *bond = to_bond(d);
1708         return sprintf(buf, "%d\n", bond->params.lp_interval);
1709 }
1710
1711 static ssize_t bonding_store_lp_interval(struct device *d,
1712                                          struct device_attribute *attr,
1713                                          const char *buf, size_t count)
1714 {
1715         struct bonding *bond = to_bond(d);
1716         int new_value, ret = count;
1717
1718         if (sscanf(buf, "%d", &new_value) != 1) {
1719                 pr_err("%s: no lp interval value specified.\n",
1720                         bond->dev->name);
1721                 ret = -EINVAL;
1722                 goto out;
1723         }
1724
1725         if (new_value <= 0) {
1726                 pr_err ("%s: lp_interval must be between 1 and %d\n",
1727                         bond->dev->name, INT_MAX);
1728                 ret = -EINVAL;
1729                 goto out;
1730         }
1731
1732         bond->params.lp_interval = new_value;
1733 out:
1734         return ret;
1735 }
1736
1737 static DEVICE_ATTR(lp_interval, S_IRUGO | S_IWUSR,
1738                    bonding_show_lp_interval, bonding_store_lp_interval);
1739
1740 static struct attribute *per_bond_attrs[] = {
1741         &dev_attr_slaves.attr,
1742         &dev_attr_mode.attr,
1743         &dev_attr_fail_over_mac.attr,
1744         &dev_attr_arp_validate.attr,
1745         &dev_attr_arp_all_targets.attr,
1746         &dev_attr_arp_interval.attr,
1747         &dev_attr_arp_ip_target.attr,
1748         &dev_attr_downdelay.attr,
1749         &dev_attr_updelay.attr,
1750         &dev_attr_lacp_rate.attr,
1751         &dev_attr_ad_select.attr,
1752         &dev_attr_xmit_hash_policy.attr,
1753         &dev_attr_num_grat_arp.attr,
1754         &dev_attr_num_unsol_na.attr,
1755         &dev_attr_miimon.attr,
1756         &dev_attr_primary.attr,
1757         &dev_attr_primary_reselect.attr,
1758         &dev_attr_use_carrier.attr,
1759         &dev_attr_active_slave.attr,
1760         &dev_attr_mii_status.attr,
1761         &dev_attr_ad_aggregator.attr,
1762         &dev_attr_ad_num_ports.attr,
1763         &dev_attr_ad_actor_key.attr,
1764         &dev_attr_ad_partner_key.attr,
1765         &dev_attr_ad_partner_mac.attr,
1766         &dev_attr_queue_id.attr,
1767         &dev_attr_all_slaves_active.attr,
1768         &dev_attr_resend_igmp.attr,
1769         &dev_attr_min_links.attr,
1770         &dev_attr_lp_interval.attr,
1771         NULL,
1772 };
1773
1774 static struct attribute_group bonding_group = {
1775         .name = "bonding",
1776         .attrs = per_bond_attrs,
1777 };
1778
1779 /*
1780  * Initialize sysfs.  This sets up the bonding_masters file in
1781  * /sys/class/net.
1782  */
1783 int bond_create_sysfs(struct bond_net *bn)
1784 {
1785         int ret;
1786
1787         bn->class_attr_bonding_masters = class_attr_bonding_masters;
1788         sysfs_attr_init(&bn->class_attr_bonding_masters.attr);
1789
1790         ret = netdev_class_create_file(&bn->class_attr_bonding_masters);
1791         /*
1792          * Permit multiple loads of the module by ignoring failures to
1793          * create the bonding_masters sysfs file.  Bonding devices
1794          * created by second or subsequent loads of the module will
1795          * not be listed in, or controllable by, bonding_masters, but
1796          * will have the usual "bonding" sysfs directory.
1797          *
1798          * This is done to preserve backwards compatibility for
1799          * initscripts/sysconfig, which load bonding multiple times to
1800          * configure multiple bonding devices.
1801          */
1802         if (ret == -EEXIST) {
1803                 /* Is someone being kinky and naming a device bonding_master? */
1804                 if (__dev_get_by_name(bn->net,
1805                                       class_attr_bonding_masters.attr.name))
1806                         pr_err("network device named %s already exists in sysfs",
1807                                class_attr_bonding_masters.attr.name);
1808                 ret = 0;
1809         }
1810
1811         return ret;
1812
1813 }
1814
1815 /*
1816  * Remove /sys/class/net/bonding_masters.
1817  */
1818 void bond_destroy_sysfs(struct bond_net *bn)
1819 {
1820         netdev_class_remove_file(&bn->class_attr_bonding_masters);
1821 }
1822
1823 /*
1824  * Initialize sysfs for each bond.  This sets up and registers
1825  * the 'bondctl' directory for each individual bond under /sys/class/net.
1826  */
1827 void bond_prepare_sysfs_group(struct bonding *bond)
1828 {
1829         bond->dev->sysfs_groups[0] = &bonding_group;
1830 }
1831