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