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, see <http://www.gnu.org/licenses/>.
  16  *
  17  * The full GNU General Public License is included in this distribution in the
  18  * file called LICENSE.
  19  *
  20  */
  21
  22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  23
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/device.h>
  27 #include <linux/sched.h>
  28 #include <linux/fs.h>
  29 #include <linux/types.h>
  30 #include <linux/string.h>
  31 #include <linux/netdevice.h>
  32 #include <linux/inetdevice.h>
  33 #include <linux/in.h>
  34 #include <linux/sysfs.h>
  35 #include <linux/ctype.h>
  36 #include <linux/inet.h>
  37 #include <linux/rtnetlink.h>
  38 #include <linux/etherdevice.h>
  39 #include <net/net_namespace.h>
  40 #include <net/netns/generic.h>
  41 #include <linux/nsproxy.h>
  42 #include <linux/reciprocal_div.h>
  43
  44 #include "bonding.h"
  45
  46 #define to_dev(obj)     container_of(obj, struct device, kobj)
  47 #define to_bond(cd)     ((struct bonding *)(netdev_priv(to_net_dev(cd))))
  48
  49 /*
  50  * "show" function for the bond_masters attribute.
  51  * The class parameter is ignored.
  52  */
  53 static ssize_t bonding_show_bonds(struct class *cls,
  54                                   struct class_attribute *attr,
  55                                   char *buf)
  56 {
  57         struct bond_net *bn =
  58                 container_of(attr, struct bond_net, class_attr_bonding_masters);
  59         int res = 0;
  60         struct bonding *bond;
  61
  62         rtnl_lock();
  63
  64         list_for_each_entry(bond, &bn->dev_list, bond_list) {
  65                 if (res > (PAGE_SIZE - IFNAMSIZ)) {
  66                         /* not enough space for another interface name */
  67                         if ((PAGE_SIZE - res) > 10)
  68                                 res = PAGE_SIZE - 10;
  69                         res += sprintf(buf + res, "++more++ ");
  70                         break;
  71                 }
  72                 res += sprintf(buf + res, "%s ", bond->dev->name);
  73         }
  74         if (res)
  75                 buf[res-1] = '\n'; /* eat the leftover space */
  76
  77         rtnl_unlock();
  78         return res;
  79 }
  80
  81 static struct net_device *bond_get_by_name(struct bond_net *bn, const char *ifname)
  82 {
  83         struct bonding *bond;
  84
  85         list_for_each_entry(bond, &bn->dev_list, bond_list) {
  86                 if (strncmp(bond->dev->name, ifname, IFNAMSIZ) == 0)
  87                         return bond->dev;
  88         }
  89         return NULL;
  90 }
  91
  92 /*
  93  * "store" function for the bond_masters attribute.  This is what
  94  * creates and deletes entire bonds.
  95  *
  96  * The class parameter is ignored.
  97  *
  98  */
  99
 100 static ssize_t bonding_store_bonds(struct class *cls,
 101                                    struct class_attribute *attr,
 102                                    const char *buffer, size_t count)
 103 {
 104         struct bond_net *bn =
 105                 container_of(attr, struct bond_net, class_attr_bonding_masters);
 106         char command[IFNAMSIZ + 1] = {0, };
 107         char *ifname;
 108         int rv, res = count;
 109
 110         sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
 111         ifname = command + 1;
 112         if ((strlen(command) <= 1) ||
 113             !dev_valid_name(ifname))
 114                 goto err_no_cmd;
 115
 116         if (command[0] == '+') {
 117                 pr_info("%s is being created...\n", ifname);
 118                 rv = bond_create(bn->net, ifname);
 119                 if (rv) {
 120                         if (rv == -EEXIST)
 121                                 pr_info("%s already exists.\n", ifname);
 122                         else
 123                                 pr_info("%s creation failed.\n", ifname);
 124                         res = rv;
 125                 }
 126         } else if (command[0] == '-') {
 127                 struct net_device *bond_dev;
 128
 129                 rtnl_lock();
 130                 bond_dev = bond_get_by_name(bn, ifname);
 131                 if (bond_dev) {
 132                         pr_info("%s is being deleted...\n", ifname);
 133                         unregister_netdevice(bond_dev);
 134                 } else {
 135                         pr_err("unable to delete non-existent %s\n", ifname);
 136                         res = -ENODEV;
 137                 }
 138                 rtnl_unlock();
 139         } else
 140                 goto err_no_cmd;
 141
 142         /* Always return either count or an error.  If you return 0, you'll
 143          * get called forever, which is bad.
 144          */
 145         return res;
 146
 147 err_no_cmd:
 148         pr_err("no command found in bonding_masters. Use +ifname or -ifname.\n");
 149         return -EPERM;
 150 }
 151
 152 /* class attribute for bond_masters file.  This ends up in /sys/class/net */
 153 static const struct class_attribute class_attr_bonding_masters = {
 154         .attr = {
 155                 .name = "bonding_masters",
 156                 .mode = S_IWUSR | S_IRUGO,
 157         },
 158         .show = bonding_show_bonds,
 159         .store = bonding_store_bonds,
 160 };
 161
 162 /*
 163  * Show the slaves in the current bond.
 164  */
 165 static ssize_t bonding_show_slaves(struct device *d,
 166                                    struct device_attribute *attr, char *buf)
 167 {
 168         struct bonding *bond = to_bond(d);
 169         struct list_head *iter;
 170         struct slave *slave;
 171         int res = 0;
 172
 173         if (!rtnl_trylock())
 174                 return restart_syscall();
 175
 176         bond_for_each_slave(bond, slave, iter) {
 177                 if (res > (PAGE_SIZE - IFNAMSIZ)) {
 178                         /* not enough space for another interface name */
 179                         if ((PAGE_SIZE - res) > 10)
 180                                 res = PAGE_SIZE - 10;
 181                         res += sprintf(buf + res, "++more++ ");
 182                         break;
 183                 }
 184                 res += sprintf(buf + res, "%s ", slave->dev->name);
 185         }
 186
 187         rtnl_unlock();
 188
 189         if (res)
 190                 buf[res-1] = '\n'; /* eat the leftover space */
 191
 192         return res;
 193 }
 194
 195 /*
 196  * Set the slaves in the current bond.
 197  * This is supposed to be only thin wrapper for bond_enslave and bond_release.
 198  * All hard work should be done there.
 199  */
 200 static ssize_t bonding_store_slaves(struct device *d,
 201                                     struct device_attribute *attr,
 202                                     const char *buffer, size_t count)
 203 {
 204         char command[IFNAMSIZ + 1] = { 0, };
 205         char *ifname;
 206         int res, ret = count;
 207         struct net_device *dev;
 208         struct bonding *bond = to_bond(d);
 209
 210         if (!rtnl_trylock())
 211                 return restart_syscall();
 212
 213         sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
 214         ifname = command + 1;
 215         if ((strlen(command) <= 1) ||
 216             !dev_valid_name(ifname))
 217                 goto err_no_cmd;
 218
 219         dev = __dev_get_by_name(dev_net(bond->dev), ifname);
 220         if (!dev) {
 221                 pr_info("%s: Interface %s does not exist!\n",
 222                         bond->dev->name, ifname);
 223                 ret = -ENODEV;
 224                 goto out;
 225         }
 226
 227         switch (command[0]) {
 228         case '+':
 229                 pr_info("%s: Adding slave %s.\n", bond->dev->name, dev->name);
 230                 res = bond_enslave(bond->dev, dev);
 231                 break;
 232
 233         case '-':
 234                 pr_info("%s: Removing slave %s.\n", bond->dev->name, dev->name);
 235                 res = bond_release(bond->dev, dev);
 236                 break;
 237
 238         default:
 239                 goto err_no_cmd;
 240         }
 241
 242         if (res)
 243                 ret = res;
 244         goto out;
 245
 246 err_no_cmd:
 247         pr_err("no command found in slaves file for bond %s. Use +ifname or -ifname.\n",
 248                bond->dev->name);
 249         ret = -EPERM;
 250
 251 out:
 252         rtnl_unlock();
 253         return ret;
 254 }
 255
 256 static DEVICE_ATTR(slaves, S_IRUGO | S_IWUSR, bonding_show_slaves,
 257                    bonding_store_slaves);
 258
 259 /*
 260  * Show and set the bonding mode.  The bond interface must be down to
 261  * change the mode.
 262  */
 263 static ssize_t bonding_show_mode(struct device *d,
 264                                  struct device_attribute *attr, char *buf)
 265 {
 266         struct bonding *bond = to_bond(d);
 267
 268         return sprintf(buf, "%s %d\n",
 269                         bond_mode_tbl[bond->params.mode].modename,
 270                         bond->params.mode);
 271 }
 272
 273 static ssize_t bonding_store_mode(struct device *d,
 274                                   struct device_attribute *attr,
 275                                   const char *buf, size_t count)
 276 {
 277         int new_value, ret;
 278         struct bonding *bond = to_bond(d);
 279
 280         new_value = bond_parse_parm(buf, bond_mode_tbl);
 281         if (new_value < 0)  {
 282                 pr_err("%s: Ignoring invalid mode value %.*s.\n",
 283                        bond->dev->name, (int)strlen(buf) - 1, buf);
 284                 return -EINVAL;
 285         }
 286         if (!rtnl_trylock())
 287                 return restart_syscall();
 288
 289         ret = bond_option_mode_set(bond, new_value);
 290         if (!ret) {
 291                 pr_info("%s: setting mode to %s (%d).\n",
 292                         bond->dev->name, bond_mode_tbl[new_value].modename,
 293                         new_value);
 294                 ret = count;
 295         }
 296
 297         rtnl_unlock();
 298         return ret;
 299 }
 300 static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
 301                    bonding_show_mode, bonding_store_mode);
 302
 303 /*
 304  * Show and set the bonding transmit hash method.
 305  */
 306 static ssize_t bonding_show_xmit_hash(struct device *d,
 307                                       struct device_attribute *attr,
 308                                       char *buf)
 309 {
 310         struct bonding *bond = to_bond(d);
 311
 312         return sprintf(buf, "%s %d\n",
 313                        xmit_hashtype_tbl[bond->params.xmit_policy].modename,
 314                        bond->params.xmit_policy);
 315 }
 316
 317 static ssize_t bonding_store_xmit_hash(struct device *d,
 318                                        struct device_attribute *attr,
 319                                        const char *buf, size_t count)
 320 {
 321         int new_value, ret = count;
 322         struct bonding *bond = to_bond(d);
 323
 324         new_value = bond_parse_parm(buf, xmit_hashtype_tbl);
 325         if (new_value < 0)  {
 326                 pr_err("%s: Ignoring invalid xmit hash policy value %.*s.\n",
 327                        bond->dev->name,
 328                        (int)strlen(buf) - 1, buf);
 329                 ret = -EINVAL;
 330         } else {
 331                 bond->params.xmit_policy = new_value;
 332                 pr_info("%s: setting xmit hash policy to %s (%d).\n",
 333                         bond->dev->name,
 334                         xmit_hashtype_tbl[new_value].modename, new_value);
 335         }
 336
 337         return ret;
 338 }
 339 static DEVICE_ATTR(xmit_hash_policy, S_IRUGO | S_IWUSR,
 340                    bonding_show_xmit_hash, bonding_store_xmit_hash);
 341
 342 /*
 343  * Show and set arp_validate.
 344  */
 345 static ssize_t bonding_show_arp_validate(struct device *d,
 346                                          struct device_attribute *attr,
 347                                          char *buf)
 348 {
 349         struct bonding *bond = to_bond(d);
 350
 351         return sprintf(buf, "%s %d\n",
 352                        arp_validate_tbl[bond->params.arp_validate].modename,
 353                        bond->params.arp_validate);
 354 }
 355
 356 static ssize_t bonding_store_arp_validate(struct device *d,
 357                                           struct device_attribute *attr,
 358                                           const char *buf, size_t count)
 359 {
 360         struct bonding *bond = to_bond(d);
 361         int new_value, ret = count;
 362
 363         if (!rtnl_trylock())
 364                 return restart_syscall();
 365         new_value = bond_parse_parm(buf, arp_validate_tbl);
 366         if (new_value < 0) {
 367                 pr_err("%s: Ignoring invalid arp_validate value %s\n",
 368                        bond->dev->name, buf);
 369                 ret = -EINVAL;
 370                 goto out;
 371         }
 372         if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
 373                 pr_err("%s: arp_validate only supported in active-backup mode.\n",
 374                        bond->dev->name);
 375                 ret = -EINVAL;
 376                 goto out;
 377         }
 378         pr_info("%s: setting arp_validate to %s (%d).\n",
 379                 bond->dev->name, arp_validate_tbl[new_value].modename,
 380                 new_value);
 381
 382         if (bond->dev->flags & IFF_UP) {
 383                 if (!new_value)
 384                         bond->recv_probe = NULL;
 385                 else if (bond->params.arp_interval)
 386                         bond->recv_probe = bond_arp_rcv;
 387         }
 388         bond->params.arp_validate = new_value;
 389 out:
 390         rtnl_unlock();
 391
 392         return ret;
 393 }
 394
 395 static DEVICE_ATTR(arp_validate, S_IRUGO | S_IWUSR, bonding_show_arp_validate,
 396                    bonding_store_arp_validate);
 397 /*
 398  * Show and set arp_all_targets.
 399  */
 400 static ssize_t bonding_show_arp_all_targets(struct device *d,
 401                                          struct device_attribute *attr,
 402                                          char *buf)
 403 {
 404         struct bonding *bond = to_bond(d);
 405         int value = bond->params.arp_all_targets;
 406
 407         return sprintf(buf, "%s %d\n", arp_all_targets_tbl[value].modename,
 408                        value);
 409 }
 410
 411 static ssize_t bonding_store_arp_all_targets(struct device *d,
 412                                           struct device_attribute *attr,
 413                                           const char *buf, size_t count)
 414 {
 415         struct bonding *bond = to_bond(d);
 416         int new_value;
 417
 418         new_value = bond_parse_parm(buf, arp_all_targets_tbl);
 419         if (new_value < 0) {
 420                 pr_err("%s: Ignoring invalid arp_all_targets value %s\n",
 421                        bond->dev->name, buf);
 422                 return -EINVAL;
 423         }
 424         pr_info("%s: setting arp_all_targets to %s (%d).\n",
 425                 bond->dev->name, arp_all_targets_tbl[new_value].modename,
 426                 new_value);
 427
 428         bond->params.arp_all_targets = new_value;
 429
 430         return count;
 431 }
 432
 433 static DEVICE_ATTR(arp_all_targets, S_IRUGO | S_IWUSR,
 434                    bonding_show_arp_all_targets, bonding_store_arp_all_targets);
 435
 436 /*
 437  * Show and store fail_over_mac.  User only allowed to change the
 438  * value when there are no slaves.
 439  */
 440 static ssize_t bonding_show_fail_over_mac(struct device *d,
 441                                           struct device_attribute *attr,
 442                                           char *buf)
 443 {
 444         struct bonding *bond = to_bond(d);
 445
 446         return sprintf(buf, "%s %d\n",
 447                        fail_over_mac_tbl[bond->params.fail_over_mac].modename,
 448                        bond->params.fail_over_mac);
 449 }
 450
 451 static ssize_t bonding_store_fail_over_mac(struct device *d,
 452                                            struct device_attribute *attr,
 453                                            const char *buf, size_t count)
 454 {
 455         int new_value, ret = count;
 456         struct bonding *bond = to_bond(d);
 457
 458         if (!rtnl_trylock())
 459                 return restart_syscall();
 460
 461         if (bond_has_slaves(bond)) {
 462                 pr_err("%s: Can't alter fail_over_mac with slaves in bond.\n",
 463                        bond->dev->name);
 464                 ret = -EPERM;
 465                 goto out;
 466         }
 467
 468         new_value = bond_parse_parm(buf, fail_over_mac_tbl);
 469         if (new_value < 0) {
 470                 pr_err("%s: Ignoring invalid fail_over_mac value %s.\n",
 471                        bond->dev->name, buf);
 472                 ret = -EINVAL;
 473                 goto out;
 474         }
 475
 476         bond->params.fail_over_mac = new_value;
 477         pr_info("%s: Setting fail_over_mac to %s (%d).\n",
 478                 bond->dev->name, fail_over_mac_tbl[new_value].modename,
 479                 new_value);
 480
 481 out:
 482         rtnl_unlock();
 483         return ret;
 484 }
 485
 486 static DEVICE_ATTR(fail_over_mac, S_IRUGO | S_IWUSR,
 487                    bonding_show_fail_over_mac, bonding_store_fail_over_mac);
 488
 489 /*
 490  * Show and set the arp timer interval.  There are two tricky bits
 491  * here.  First, if ARP monitoring is activated, then we must disable
 492  * MII monitoring.  Second, if the ARP timer isn't running, we must
 493  * start it.
 494  */
 495 static ssize_t bonding_show_arp_interval(struct device *d,
 496                                          struct device_attribute *attr,
 497                                          char *buf)
 498 {
 499         struct bonding *bond = to_bond(d);
 500
 501         return sprintf(buf, "%d\n", bond->params.arp_interval);
 502 }
 503
 504 static ssize_t bonding_store_arp_interval(struct device *d,
 505                                           struct device_attribute *attr,
 506                                           const char *buf, size_t count)
 507 {
 508         struct bonding *bond = to_bond(d);
 509         int new_value, ret = count;
 510
 511         if (!rtnl_trylock())
 512                 return restart_syscall();
 513         if (sscanf(buf, "%d", &new_value) != 1) {
 514                 pr_err("%s: no arp_interval value specified.\n",
 515                        bond->dev->name);
 516                 ret = -EINVAL;
 517                 goto out;
 518         }
 519         if (new_value < 0) {
 520                 pr_err("%s: Invalid arp_interval value %d not in range 0-%d; rejected.\n",
 521                        bond->dev->name, new_value, INT_MAX);
 522                 ret = -EINVAL;
 523                 goto out;
 524         }
 525         if (BOND_NO_USES_ARP(bond->params.mode)) {
 526                 pr_info("%s: ARP monitoring cannot be used with ALB/TLB/802.3ad. Only MII monitoring is supported on %s.\n",
 527                         bond->dev->name, bond->dev->name);
 528                 ret = -EINVAL;
 529                 goto out;
 530         }
 531         pr_info("%s: Setting ARP monitoring interval to %d.\n",
 532                 bond->dev->name, new_value);
 533         bond->params.arp_interval = new_value;
 534         if (new_value) {
 535                 if (bond->params.miimon) {
 536                         pr_info("%s: ARP monitoring cannot be used with MII monitoring. %s Disabling MII monitoring.\n",
 537                                 bond->dev->name, bond->dev->name);
 538                         bond->params.miimon = 0;
 539                 }
 540                 if (!bond->params.arp_targets[0])
 541                         pr_info("%s: ARP monitoring has been set up, but no ARP targets have been specified.\n",
 542                                 bond->dev->name);
 543         }
 544         if (bond->dev->flags & IFF_UP) {
 545                 /* If the interface is up, we may need to fire off
 546                  * the ARP timer.  If the interface is down, the
 547                  * timer will get fired off when the open function
 548                  * is called.
 549                  */
 550                 if (!new_value) {
 551                         if (bond->params.arp_validate)
 552                                 bond->recv_probe = NULL;
 553                         cancel_delayed_work_sync(&bond->arp_work);
 554                 } else {
 555                         /* arp_validate can be set only in active-backup mode */
 556                         if (bond->params.arp_validate)
 557                                 bond->recv_probe = bond_arp_rcv;
 558                         cancel_delayed_work_sync(&bond->mii_work);
 559                         queue_delayed_work(bond->wq, &bond->arp_work, 0);
 560                 }
 561         }
 562 out:
 563         rtnl_unlock();
 564         return ret;
 565 }
 566 static DEVICE_ATTR(arp_interval, S_IRUGO | S_IWUSR,
 567                    bonding_show_arp_interval, bonding_store_arp_interval);
 568
 569 /*
 570  * Show and set the arp targets.
 571  */
 572 static ssize_t bonding_show_arp_targets(struct device *d,
 573                                         struct device_attribute *attr,
 574                                         char *buf)
 575 {
 576         int i, res = 0;
 577         struct bonding *bond = to_bond(d);
 578
 579         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) {
 580                 if (bond->params.arp_targets[i])
 581                         res += sprintf(buf + res, "%pI4 ",
 582                                        &bond->params.arp_targets[i]);
 583         }
 584         if (res)
 585                 buf[res-1] = '\n'; /* eat the leftover space */
 586         return res;
 587 }
 588
 589 static ssize_t bonding_store_arp_targets(struct device *d,
 590                                          struct device_attribute *attr,
 591                                          const char *buf, size_t count)
 592 {
 593         struct bonding *bond = to_bond(d);
 594         struct list_head *iter;
 595         struct slave *slave;
 596         __be32 newtarget, *targets;
 597         unsigned long *targets_rx;
 598         int ind, i, j, ret = -EINVAL;
 599
 600         if (!rtnl_trylock())
 601                 return restart_syscall();
 602
 603         targets = bond->params.arp_targets;
 604         if (!in4_pton(buf + 1, -1, (u8 *)&newtarget, -1, NULL) ||
 605             IS_IP_TARGET_UNUSABLE_ADDRESS(newtarget)) {
 606                 pr_err("%s: invalid ARP target %pI4 specified for addition\n",
 607                        bond->dev->name, &newtarget);
 608                 goto out;
 609         }
 610         /* look for adds */
 611         if (buf[0] == '+') {
 612                 if (bond_get_targets_ip(targets, newtarget) != -1) { /* dup */
 613                         pr_err("%s: ARP target %pI4 is already present\n",
 614                                bond->dev->name, &newtarget);
 615                         goto out;
 616                 }
 617
 618                 ind = bond_get_targets_ip(targets, 0); /* first free slot */
 619                 if (ind == -1) {
 620                         pr_err("%s: ARP target table is full!\n",
 621                                bond->dev->name);
 622                         goto out;
 623                 }
 624
 625                 pr_info("%s: adding ARP target %pI4.\n", bond->dev->name,
 626                          &newtarget);
 627                 /* not to race with bond_arp_rcv */
 628                 write_lock_bh(&bond->lock);
 629                 bond_for_each_slave(bond, slave, iter)
 630                         slave->target_last_arp_rx[ind] = jiffies;
 631                 targets[ind] = newtarget;
 632                 write_unlock_bh(&bond->lock);
 633         } else if (buf[0] == '-')       {
 634                 ind = bond_get_targets_ip(targets, newtarget);
 635                 if (ind == -1) {
 636                         pr_err("%s: unable to remove nonexistent ARP target %pI4.\n",
 637                                 bond->dev->name, &newtarget);
 638                         goto out;
 639                 }
 640
 641                 if (ind == 0 && !targets[1] && bond->params.arp_interval)
 642                         pr_warn("%s: removing last arp target with arp_interval on\n",
 643                                 bond->dev->name);
 644
 645                 pr_info("%s: removing ARP target %pI4.\n", bond->dev->name,
 646                         &newtarget);
 647
 648                 write_lock_bh(&bond->lock);
 649                 bond_for_each_slave(bond, slave, iter) {
 650                         targets_rx = slave->target_last_arp_rx;
 651                         j = ind;
 652                         for (; (j < BOND_MAX_ARP_TARGETS-1) && targets[j+1]; j++)
 653                                 targets_rx[j] = targets_rx[j+1];
 654                         targets_rx[j] = 0;
 655                 }
 656                 for (i = ind; (i < BOND_MAX_ARP_TARGETS-1) && targets[i+1]; i++)
 657                         targets[i] = targets[i+1];
 658                 targets[i] = 0;
 659                 write_unlock_bh(&bond->lock);
 660         } else {
 661                 pr_err("no command found in arp_ip_targets file for bond %s. Use +<addr> or -<addr>.\n",
 662                        bond->dev->name);
 663                 ret = -EPERM;
 664                 goto out;
 665         }
 666
 667         ret = count;
 668 out:
 669         rtnl_unlock();
 670         return ret;
 671 }
 672 static DEVICE_ATTR(arp_ip_target, S_IRUGO | S_IWUSR , bonding_show_arp_targets, bonding_store_arp_targets);
 673
 674 /*
 675  * Show and set the up and down delays.  These must be multiples of the
 676  * MII monitoring value, and are stored internally as the multiplier.
 677  * Thus, we must translate to MS for the real world.
 678  */
 679 static ssize_t bonding_show_downdelay(struct device *d,
 680                                       struct device_attribute *attr,
 681                                       char *buf)
 682 {
 683         struct bonding *bond = to_bond(d);
 684
 685         return sprintf(buf, "%d\n", bond->params.downdelay * bond->params.miimon);
 686 }
 687
 688 static ssize_t bonding_store_downdelay(struct device *d,
 689                                        struct device_attribute *attr,
 690                                        const char *buf, size_t count)
 691 {
 692         int new_value, ret = count;
 693         struct bonding *bond = to_bond(d);
 694
 695         if (!rtnl_trylock())
 696                 return restart_syscall();
 697         if (!(bond->params.miimon)) {
 698                 pr_err("%s: Unable to set down delay as MII monitoring is disabled\n",
 699                        bond->dev->name);
 700                 ret = -EPERM;
 701                 goto out;
 702         }
 703
 704         if (sscanf(buf, "%d", &new_value) != 1) {
 705                 pr_err("%s: no down delay value specified.\n", bond->dev->name);
 706                 ret = -EINVAL;
 707                 goto out;
 708         }
 709         if (new_value < 0) {
 710                 pr_err("%s: Invalid down delay value %d not in range %d-%d; rejected.\n",
 711                        bond->dev->name, new_value, 0, INT_MAX);
 712                 ret = -EINVAL;
 713                 goto out;
 714         } else {
 715                 if ((new_value % bond->params.miimon) != 0) {
 716                         pr_warning("%s: Warning: down delay (%d) is not a multiple of miimon (%d), delay rounded to %d ms\n",
 717                                    bond->dev->name, new_value,
 718                                    bond->params.miimon,
 719                                    (new_value / bond->params.miimon) *
 720                                    bond->params.miimon);
 721                 }
 722                 bond->params.downdelay = new_value / bond->params.miimon;
 723                 pr_info("%s: Setting down delay to %d.\n",
 724                         bond->dev->name,
 725                         bond->params.downdelay * bond->params.miimon);
 726
 727         }
 728
 729 out:
 730         rtnl_unlock();
 731         return ret;
 732 }
 733 static DEVICE_ATTR(downdelay, S_IRUGO | S_IWUSR,
 734                    bonding_show_downdelay, bonding_store_downdelay);
 735
 736 static ssize_t bonding_show_updelay(struct device *d,
 737                                     struct device_attribute *attr,
 738                                     char *buf)
 739 {
 740         struct bonding *bond = to_bond(d);
 741
 742         return sprintf(buf, "%d\n", bond->params.updelay * bond->params.miimon);
 743
 744 }
 745
 746 static ssize_t bonding_store_updelay(struct device *d,
 747                                      struct device_attribute *attr,
 748                                      const char *buf, size_t count)
 749 {
 750         int new_value, ret = count;
 751         struct bonding *bond = to_bond(d);
 752
 753         if (!rtnl_trylock())
 754                 return restart_syscall();
 755         if (!(bond->params.miimon)) {
 756                 pr_err("%s: Unable to set up delay as MII monitoring is disabled\n",
 757                        bond->dev->name);
 758                 ret = -EPERM;
 759                 goto out;
 760         }
 761
 762         if (sscanf(buf, "%d", &new_value) != 1) {
 763                 pr_err("%s: no up delay value specified.\n",
 764                        bond->dev->name);
 765                 ret = -EINVAL;
 766                 goto out;
 767         }
 768         if (new_value < 0) {
 769                 pr_err("%s: Invalid up delay value %d not in range %d-%d; rejected.\n",
 770                        bond->dev->name, new_value, 0, INT_MAX);
 771                 ret = -EINVAL;
 772                 goto out;
 773         } else {
 774                 if ((new_value % bond->params.miimon) != 0) {
 775                         pr_warning("%s: Warning: up delay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
 776                                    bond->dev->name, new_value,
 777                                    bond->params.miimon,
 778                                    (new_value / bond->params.miimon) *
 779                                    bond->params.miimon);
 780                 }
 781                 bond->params.updelay = new_value / bond->params.miimon;
 782                 pr_info("%s: Setting up delay to %d.\n",
 783                         bond->dev->name,
 784                         bond->params.updelay * bond->params.miimon);
 785         }
 786
 787 out:
 788         rtnl_unlock();
 789         return ret;
 790 }
 791 static DEVICE_ATTR(updelay, S_IRUGO | S_IWUSR,
 792                    bonding_show_updelay, bonding_store_updelay);
 793
 794 /*
 795  * Show and set the LACP interval.  Interface must be down, and the mode
 796  * must be set to 802.3ad mode.
 797  */
 798 static ssize_t bonding_show_lacp(struct device *d,
 799                                  struct device_attribute *attr,
 800                                  char *buf)
 801 {
 802         struct bonding *bond = to_bond(d);
 803
 804         return sprintf(buf, "%s %d\n",
 805                 bond_lacp_tbl[bond->params.lacp_fast].modename,
 806                 bond->params.lacp_fast);
 807 }
 808
 809 static ssize_t bonding_store_lacp(struct device *d,
 810                                   struct device_attribute *attr,
 811                                   const char *buf, size_t count)
 812 {
 813         struct bonding *bond = to_bond(d);
 814         int new_value, ret = count;
 815
 816         if (!rtnl_trylock())
 817                 return restart_syscall();
 818
 819         if (bond->dev->flags & IFF_UP) {
 820                 pr_err("%s: Unable to update LACP rate because interface is up.\n",
 821                        bond->dev->name);
 822                 ret = -EPERM;
 823                 goto out;
 824         }
 825
 826         if (bond->params.mode != BOND_MODE_8023AD) {
 827                 pr_err("%s: Unable to update LACP rate because bond is not in 802.3ad mode.\n",
 828                        bond->dev->name);
 829                 ret = -EPERM;
 830                 goto out;
 831         }
 832
 833         new_value = bond_parse_parm(buf, bond_lacp_tbl);
 834
 835         if ((new_value == 1) || (new_value == 0)) {
 836                 bond->params.lacp_fast = new_value;
 837                 bond_3ad_update_lacp_rate(bond);
 838                 pr_info("%s: Setting LACP rate to %s (%d).\n",
 839                         bond->dev->name, bond_lacp_tbl[new_value].modename,
 840                         new_value);
 841         } else {
 842                 pr_err("%s: Ignoring invalid LACP rate value %.*s.\n",
 843                        bond->dev->name, (int)strlen(buf) - 1, buf);
 844                 ret = -EINVAL;
 845         }
 846 out:
 847         rtnl_unlock();
 848
 849         return ret;
 850 }
 851 static DEVICE_ATTR(lacp_rate, S_IRUGO | S_IWUSR,
 852                    bonding_show_lacp, bonding_store_lacp);
 853
 854 static ssize_t bonding_show_min_links(struct device *d,
 855                                       struct device_attribute *attr,
 856                                       char *buf)
 857 {
 858         struct bonding *bond = to_bond(d);
 859
 860         return sprintf(buf, "%d\n", bond->params.min_links);
 861 }
 862
 863 static ssize_t bonding_store_min_links(struct device *d,
 864                                        struct device_attribute *attr,
 865                                        const char *buf, size_t count)
 866 {
 867         struct bonding *bond = to_bond(d);
 868         int ret;
 869         unsigned int new_value;
 870
 871         ret = kstrtouint(buf, 0, &new_value);
 872         if (ret < 0) {
 873                 pr_err("%s: Ignoring invalid min links value %s.\n",
 874                        bond->dev->name, buf);
 875                 return ret;
 876         }
 877
 878         pr_info("%s: Setting min links value to %u\n",
 879                 bond->dev->name, new_value);
 880         bond->params.min_links = new_value;
 881         return count;
 882 }
 883 static DEVICE_ATTR(min_links, S_IRUGO | S_IWUSR,
 884                    bonding_show_min_links, bonding_store_min_links);
 885
 886 static ssize_t bonding_show_ad_select(struct device *d,
 887                                       struct device_attribute *attr,
 888                                       char *buf)
 889 {
 890         struct bonding *bond = to_bond(d);
 891
 892         return sprintf(buf, "%s %d\n",
 893                 ad_select_tbl[bond->params.ad_select].modename,
 894                 bond->params.ad_select);
 895 }
 896
 897
 898 static ssize_t bonding_store_ad_select(struct device *d,
 899                                        struct device_attribute *attr,
 900                                        const char *buf, size_t count)
 901 {
 902         int new_value, ret = count;
 903         struct bonding *bond = to_bond(d);
 904
 905         if (bond->dev->flags & IFF_UP) {
 906                 pr_err("%s: Unable to update ad_select because interface is up.\n",
 907                        bond->dev->name);
 908                 ret = -EPERM;
 909                 goto out;
 910         }
 911
 912         new_value = bond_parse_parm(buf, ad_select_tbl);
 913
 914         if (new_value != -1) {
 915                 bond->params.ad_select = new_value;
 916                 pr_info("%s: Setting ad_select to %s (%d).\n",
 917                         bond->dev->name, ad_select_tbl[new_value].modename,
 918                         new_value);
 919         } else {
 920                 pr_err("%s: Ignoring invalid ad_select value %.*s.\n",
 921                        bond->dev->name, (int)strlen(buf) - 1, buf);
 922                 ret = -EINVAL;
 923         }
 924 out:
 925         return ret;
 926 }
 927 static DEVICE_ATTR(ad_select, S_IRUGO | S_IWUSR,
 928                    bonding_show_ad_select, bonding_store_ad_select);
 929
 930 /*
 931  * Show and set the number of peer notifications to send after a failover event.
 932  */
 933 static ssize_t bonding_show_num_peer_notif(struct device *d,
 934                                            struct device_attribute *attr,
 935                                            char *buf)
 936 {
 937         struct bonding *bond = to_bond(d);
 938         return sprintf(buf, "%d\n", bond->params.num_peer_notif);
 939 }
 940
 941 static ssize_t bonding_store_num_peer_notif(struct device *d,
 942                                             struct device_attribute *attr,
 943                                             const char *buf, size_t count)
 944 {
 945         struct bonding *bond = to_bond(d);
 946         int err = kstrtou8(buf, 10, &bond->params.num_peer_notif);
 947         return err ? err : count;
 948 }
 949 static DEVICE_ATTR(num_grat_arp, S_IRUGO | S_IWUSR,
 950                    bonding_show_num_peer_notif, bonding_store_num_peer_notif);
 951 static DEVICE_ATTR(num_unsol_na, S_IRUGO | S_IWUSR,
 952                    bonding_show_num_peer_notif, bonding_store_num_peer_notif);
 953
 954 /*
 955  * Show and set the MII monitor interval.  There are two tricky bits
 956  * here.  First, if MII monitoring is activated, then we must disable
 957  * ARP monitoring.  Second, if the timer isn't running, we must
 958  * start it.
 959  */
 960 static ssize_t bonding_show_miimon(struct device *d,
 961                                    struct device_attribute *attr,
 962                                    char *buf)
 963 {
 964         struct bonding *bond = to_bond(d);
 965
 966         return sprintf(buf, "%d\n", bond->params.miimon);
 967 }
 968
 969 static ssize_t bonding_store_miimon(struct device *d,
 970                                     struct device_attribute *attr,
 971                                     const char *buf, size_t count)
 972 {
 973         int new_value, ret = count;
 974         struct bonding *bond = to_bond(d);
 975
 976         if (!rtnl_trylock())
 977                 return restart_syscall();
 978         if (sscanf(buf, "%d", &new_value) != 1) {
 979                 pr_err("%s: no miimon value specified.\n",
 980                        bond->dev->name);
 981                 ret = -EINVAL;
 982                 goto out;
 983         }
 984         if (new_value < 0) {
 985                 pr_err("%s: Invalid miimon value %d not in range %d-%d; rejected.\n",
 986                        bond->dev->name, new_value, 0, INT_MAX);
 987                 ret = -EINVAL;
 988                 goto out;
 989         }
 990         pr_info("%s: Setting MII monitoring interval to %d.\n",
 991                 bond->dev->name, new_value);
 992         bond->params.miimon = new_value;
 993         if (bond->params.updelay)
 994                 pr_info("%s: Note: Updating updelay (to %d) since it is a multiple of the miimon value.\n",
 995                         bond->dev->name,
 996                         bond->params.updelay * bond->params.miimon);
 997         if (bond->params.downdelay)
 998                 pr_info("%s: Note: Updating downdelay (to %d) since it is a multiple of the miimon value.\n",
 999                         bond->dev->name,
1000                         bond->params.downdelay * bond->params.miimon);
1001         if (new_value && bond->params.arp_interval) {
1002                 pr_info("%s: MII monitoring cannot be used with ARP monitoring. Disabling ARP monitoring...\n",
1003                         bond->dev->name);
1004                 bond->params.arp_interval = 0;
1005                 if (bond->params.arp_validate)
1006                         bond->params.arp_validate = BOND_ARP_VALIDATE_NONE;
1007         }
1008         if (bond->dev->flags & IFF_UP) {
1009                 /* If the interface is up, we may need to fire off
1010                  * the MII timer. If the interface is down, the
1011                  * timer will get fired off when the open function
1012                  * is called.
1013                  */
1014                 if (!new_value) {
1015                         cancel_delayed_work_sync(&bond->mii_work);
1016                 } else {
1017                         cancel_delayed_work_sync(&bond->arp_work);
1018                         queue_delayed_work(bond->wq, &bond->mii_work, 0);
1019                 }
1020         }
1021 out:
1022         rtnl_unlock();
1023         return ret;
1024 }
1025 static DEVICE_ATTR(miimon, S_IRUGO | S_IWUSR,
1026                    bonding_show_miimon, bonding_store_miimon);
1027
1028 /*
1029  * Show and set the primary slave.  The store function is much
1030  * simpler than bonding_store_slaves function because it only needs to
1031  * handle one interface name.
1032  * The bond must be a mode that supports a primary for this be
1033  * set.
1034  */
1035 static ssize_t bonding_show_primary(struct device *d,
1036                                     struct device_attribute *attr,
1037                                     char *buf)
1038 {
1039         int count = 0;
1040         struct bonding *bond = to_bond(d);
1041
1042         if (bond->primary_slave)
1043                 count = sprintf(buf, "%s\n", bond->primary_slave->dev->name);
1044
1045         return count;
1046 }
1047
1048 static ssize_t bonding_store_primary(struct device *d,
1049                                      struct device_attribute *attr,
1050                                      const char *buf, size_t count)
1051 {
1052         struct bonding *bond = to_bond(d);
1053         struct list_head *iter;
1054         char ifname[IFNAMSIZ];
1055         struct slave *slave;
1056
1057         if (!rtnl_trylock())
1058                 return restart_syscall();
1059         block_netpoll_tx();
1060         read_lock(&bond->lock);
1061         write_lock_bh(&bond->curr_slave_lock);
1062
1063         if (!USES_PRIMARY(bond->params.mode)) {
1064                 pr_info("%s: Unable to set primary slave; %s is in mode %d\n",
1065                         bond->dev->name, bond->dev->name, bond->params.mode);
1066                 goto out;
1067         }
1068
1069         sscanf(buf, "%15s", ifname); /* IFNAMSIZ */
1070
1071         /* check to see if we are clearing primary */
1072         if (!strlen(ifname) || buf[0] == '\n') {
1073                 pr_info("%s: Setting primary slave to None.\n",
1074                         bond->dev->name);
1075                 bond->primary_slave = NULL;
1076                 memset(bond->params.primary, 0, sizeof(bond->params.primary));
1077                 bond_select_active_slave(bond);
1078                 goto out;
1079         }
1080
1081         bond_for_each_slave(bond, slave, iter) {
1082                 if (strncmp(slave->dev->name, ifname, IFNAMSIZ) == 0) {
1083                         pr_info("%s: Setting %s as primary slave.\n",
1084                                 bond->dev->name, slave->dev->name);
1085                         bond->primary_slave = slave;
1086                         strcpy(bond->params.primary, slave->dev->name);
1087                         bond_select_active_slave(bond);
1088                         goto out;
1089                 }
1090         }
1091
1092         strncpy(bond->params.primary, ifname, IFNAMSIZ);
1093         bond->params.primary[IFNAMSIZ - 1] = 0;
1094
1095         pr_info("%s: Recording %s as primary, "
1096                 "but it has not been enslaved to %s yet.\n",
1097                 bond->dev->name, ifname, bond->dev->name);
1098 out:
1099         write_unlock_bh(&bond->curr_slave_lock);
1100         read_unlock(&bond->lock);
1101         unblock_netpoll_tx();
1102         rtnl_unlock();
1103
1104         return count;
1105 }
1106 static DEVICE_ATTR(primary, S_IRUGO | S_IWUSR,
1107                    bonding_show_primary, bonding_store_primary);
1108
1109 /*
1110  * Show and set the primary_reselect flag.
1111  */
1112 static ssize_t bonding_show_primary_reselect(struct device *d,
1113                                              struct device_attribute *attr,
1114                                              char *buf)
1115 {
1116         struct bonding *bond = to_bond(d);
1117
1118         return sprintf(buf, "%s %d\n",
1119                        pri_reselect_tbl[bond->params.primary_reselect].modename,
1120                        bond->params.primary_reselect);
1121 }
1122
1123 static ssize_t bonding_store_primary_reselect(struct device *d,
1124                                               struct device_attribute *attr,
1125                                               const char *buf, size_t count)
1126 {
1127         int new_value, ret = count;
1128         struct bonding *bond = to_bond(d);
1129
1130         if (!rtnl_trylock())
1131                 return restart_syscall();
1132
1133         new_value = bond_parse_parm(buf, pri_reselect_tbl);
1134         if (new_value < 0)  {
1135                 pr_err("%s: Ignoring invalid primary_reselect value %.*s.\n",
1136                        bond->dev->name,
1137                        (int) strlen(buf) - 1, buf);
1138                 ret = -EINVAL;
1139                 goto out;
1140         }
1141
1142         bond->params.primary_reselect = new_value;
1143         pr_info("%s: setting primary_reselect to %s (%d).\n",
1144                 bond->dev->name, pri_reselect_tbl[new_value].modename,
1145                 new_value);
1146
1147         block_netpoll_tx();
1148         read_lock(&bond->lock);
1149         write_lock_bh(&bond->curr_slave_lock);
1150         bond_select_active_slave(bond);
1151         write_unlock_bh(&bond->curr_slave_lock);
1152         read_unlock(&bond->lock);
1153         unblock_netpoll_tx();
1154 out:
1155         rtnl_unlock();
1156         return ret;
1157 }
1158 static DEVICE_ATTR(primary_reselect, S_IRUGO | S_IWUSR,
1159                    bonding_show_primary_reselect,
1160                    bonding_store_primary_reselect);
1161
1162 /*
1163  * Show and set the use_carrier flag.
1164  */
1165 static ssize_t bonding_show_carrier(struct device *d,
1166                                     struct device_attribute *attr,
1167                                     char *buf)
1168 {
1169         struct bonding *bond = to_bond(d);
1170
1171         return sprintf(buf, "%d\n", bond->params.use_carrier);
1172 }
1173
1174 static ssize_t bonding_store_carrier(struct device *d,
1175                                      struct device_attribute *attr,
1176                                      const char *buf, size_t count)
1177 {
1178         int new_value, ret = count;
1179         struct bonding *bond = to_bond(d);
1180
1181
1182         if (sscanf(buf, "%d", &new_value) != 1) {
1183                 pr_err("%s: no use_carrier value specified.\n",
1184                        bond->dev->name);
1185                 ret = -EINVAL;
1186                 goto out;
1187         }
1188         if ((new_value == 0) || (new_value == 1)) {
1189                 bond->params.use_carrier = new_value;
1190                 pr_info("%s: Setting use_carrier to %d.\n",
1191                         bond->dev->name, new_value);
1192         } else {
1193                 pr_info("%s: Ignoring invalid use_carrier value %d.\n",
1194                         bond->dev->name, new_value);
1195         }
1196 out:
1197         return ret;
1198 }
1199 static DEVICE_ATTR(use_carrier, S_IRUGO | S_IWUSR,
1200                    bonding_show_carrier, bonding_store_carrier);
1201
1202
1203 /*
1204  * Show and set currently active_slave.
1205  */
1206 static ssize_t bonding_show_active_slave(struct device *d,
1207                                          struct device_attribute *attr,
1208                                          char *buf)
1209 {
1210         struct bonding *bond = to_bond(d);
1211         struct net_device *slave_dev;
1212         int count = 0;
1213
1214         rcu_read_lock();
1215         slave_dev = bond_option_active_slave_get_rcu(bond);
1216         if (slave_dev)
1217                 count = sprintf(buf, "%s\n", slave_dev->name);
1218         rcu_read_unlock();
1219
1220         return count;
1221 }
1222
1223 static ssize_t bonding_store_active_slave(struct device *d,
1224                                           struct device_attribute *attr,
1225                                           const char *buf, size_t count)
1226 {
1227         int ret;
1228         struct bonding *bond = to_bond(d);
1229         char ifname[IFNAMSIZ];
1230         struct net_device *dev;
1231
1232         if (!rtnl_trylock())
1233                 return restart_syscall();
1234
1235         sscanf(buf, "%15s", ifname); /* IFNAMSIZ */
1236         if (!strlen(ifname) || buf[0] == '\n') {
1237                 dev = NULL;
1238         } else {
1239                 dev = __dev_get_by_name(dev_net(bond->dev), ifname);
1240                 if (!dev) {
1241                         ret = -ENODEV;
1242                         goto out;
1243                 }
1244         }
1245
1246         ret = bond_option_active_slave_set(bond, dev);
1247         if (!ret)
1248                 ret = count;
1249
1250  out:
1251         rtnl_unlock();
1252
1253         return ret;
1254
1255 }
1256 static DEVICE_ATTR(active_slave, S_IRUGO | S_IWUSR,
1257                    bonding_show_active_slave, bonding_store_active_slave);
1258
1259
1260 /*
1261  * Show link status of the bond interface.
1262  */
1263 static ssize_t bonding_show_mii_status(struct device *d,
1264                                        struct device_attribute *attr,
1265                                        char *buf)
1266 {
1267         struct bonding *bond = to_bond(d);
1268
1269         return sprintf(buf, "%s\n", bond->curr_active_slave ? "up" : "down");
1270 }
1271 static DEVICE_ATTR(mii_status, S_IRUGO, bonding_show_mii_status, NULL);
1272
1273 /*
1274  * Show current 802.3ad aggregator ID.
1275  */
1276 static ssize_t bonding_show_ad_aggregator(struct device *d,
1277                                           struct device_attribute *attr,
1278                                           char *buf)
1279 {
1280         int count = 0;
1281         struct bonding *bond = to_bond(d);
1282
1283         if (bond->params.mode == BOND_MODE_8023AD) {
1284                 struct ad_info ad_info;
1285                 count = sprintf(buf, "%d\n",
1286                                 bond_3ad_get_active_agg_info(bond, &ad_info)
1287                                 ?  0 : ad_info.aggregator_id);
1288         }
1289
1290         return count;
1291 }
1292 static DEVICE_ATTR(ad_aggregator, S_IRUGO, bonding_show_ad_aggregator, NULL);
1293
1294
1295 /*
1296  * Show number of active 802.3ad ports.
1297  */
1298 static ssize_t bonding_show_ad_num_ports(struct device *d,
1299                                          struct device_attribute *attr,
1300                                          char *buf)
1301 {
1302         int count = 0;
1303         struct bonding *bond = to_bond(d);
1304
1305         if (bond->params.mode == BOND_MODE_8023AD) {
1306                 struct ad_info ad_info;
1307                 count = sprintf(buf, "%d\n",
1308                                 bond_3ad_get_active_agg_info(bond, &ad_info)
1309                                 ?  0 : ad_info.ports);
1310         }
1311
1312         return count;
1313 }
1314 static DEVICE_ATTR(ad_num_ports, S_IRUGO, bonding_show_ad_num_ports, NULL);
1315
1316
1317 /*
1318  * Show current 802.3ad actor key.
1319  */
1320 static ssize_t bonding_show_ad_actor_key(struct device *d,
1321                                          struct device_attribute *attr,
1322                                          char *buf)
1323 {
1324         int count = 0;
1325         struct bonding *bond = to_bond(d);
1326
1327         if (bond->params.mode == BOND_MODE_8023AD) {
1328                 struct ad_info ad_info;
1329                 count = sprintf(buf, "%d\n",
1330                                 bond_3ad_get_active_agg_info(bond, &ad_info)
1331                                 ?  0 : ad_info.actor_key);
1332         }
1333
1334         return count;
1335 }
1336 static DEVICE_ATTR(ad_actor_key, S_IRUGO, bonding_show_ad_actor_key, NULL);
1337
1338
1339 /*
1340  * Show current 802.3ad partner key.
1341  */
1342 static ssize_t bonding_show_ad_partner_key(struct device *d,
1343                                            struct device_attribute *attr,
1344                                            char *buf)
1345 {
1346         int count = 0;
1347         struct bonding *bond = to_bond(d);
1348
1349         if (bond->params.mode == BOND_MODE_8023AD) {
1350                 struct ad_info ad_info;
1351                 count = sprintf(buf, "%d\n",
1352                                 bond_3ad_get_active_agg_info(bond, &ad_info)
1353                                 ?  0 : ad_info.partner_key);
1354         }
1355
1356         return count;
1357 }
1358 static DEVICE_ATTR(ad_partner_key, S_IRUGO, bonding_show_ad_partner_key, NULL);
1359
1360
1361 /*
1362  * Show current 802.3ad partner mac.
1363  */
1364 static ssize_t bonding_show_ad_partner_mac(struct device *d,
1365                                            struct device_attribute *attr,
1366                                            char *buf)
1367 {
1368         int count = 0;
1369         struct bonding *bond = to_bond(d);
1370
1371         if (bond->params.mode == BOND_MODE_8023AD) {
1372                 struct ad_info ad_info;
1373                 if (!bond_3ad_get_active_agg_info(bond, &ad_info))
1374                         count = sprintf(buf, "%pM\n", ad_info.partner_system);
1375         }
1376
1377         return count;
1378 }
1379 static DEVICE_ATTR(ad_partner_mac, S_IRUGO, bonding_show_ad_partner_mac, NULL);
1380
1381 /*
1382  * Show the queue_ids of the slaves in the current bond.
1383  */
1384 static ssize_t bonding_show_queue_id(struct device *d,
1385                                      struct device_attribute *attr,
1386                                      char *buf)
1387 {
1388         struct bonding *bond = to_bond(d);
1389         struct list_head *iter;
1390         struct slave *slave;
1391         int res = 0;
1392
1393         if (!rtnl_trylock())
1394                 return restart_syscall();
1395
1396         bond_for_each_slave(bond, slave, iter) {
1397                 if (res > (PAGE_SIZE - IFNAMSIZ - 6)) {
1398                         /* not enough space for another interface_name:queue_id pair */
1399                         if ((PAGE_SIZE - res) > 10)
1400                                 res = PAGE_SIZE - 10;
1401                         res += sprintf(buf + res, "++more++ ");
1402                         break;
1403                 }
1404                 res += sprintf(buf + res, "%s:%d ",
1405                                slave->dev->name, slave->queue_id);
1406         }
1407         if (res)
1408                 buf[res-1] = '\n'; /* eat the leftover space */
1409
1410         rtnl_unlock();
1411
1412         return res;
1413 }
1414
1415 /*
1416  * Set the queue_ids of the  slaves in the current bond.  The bond
1417  * interface must be enslaved for this to work.
1418  */
1419 static ssize_t bonding_store_queue_id(struct device *d,
1420                                       struct device_attribute *attr,
1421                                       const char *buffer, size_t count)
1422 {
1423         struct slave *slave, *update_slave;
1424         struct bonding *bond = to_bond(d);
1425         struct list_head *iter;
1426         u16 qid;
1427         int ret = count;
1428         char *delim;
1429         struct net_device *sdev = NULL;
1430
1431         if (!rtnl_trylock())
1432                 return restart_syscall();
1433
1434         /* delim will point to queue id if successful */
1435         delim = strchr(buffer, ':');
1436         if (!delim)
1437                 goto err_no_cmd;
1438
1439         /*
1440          * Terminate string that points to device name and bump it
1441          * up one, so we can read the queue id there.
1442          */
1443         *delim = '\0';
1444         if (sscanf(++delim, "%hd\n", &qid) != 1)
1445                 goto err_no_cmd;
1446
1447         /* Check buffer length, valid ifname and queue id */
1448         if (strlen(buffer) > IFNAMSIZ ||
1449             !dev_valid_name(buffer) ||
1450             qid > bond->dev->real_num_tx_queues)
1451                 goto err_no_cmd;
1452
1453         /* Get the pointer to that interface if it exists */
1454         sdev = __dev_get_by_name(dev_net(bond->dev), buffer);
1455         if (!sdev)
1456                 goto err_no_cmd;
1457
1458         /* Search for thes slave and check for duplicate qids */
1459         update_slave = NULL;
1460         bond_for_each_slave(bond, slave, iter) {
1461                 if (sdev == slave->dev)
1462                         /*
1463                          * We don't need to check the matching
1464                          * slave for dups, since we're overwriting it
1465                          */
1466                         update_slave = slave;
1467                 else if (qid && qid == slave->queue_id) {
1468                         goto err_no_cmd;
1469                 }
1470         }
1471
1472         if (!update_slave)
1473                 goto err_no_cmd;
1474
1475         /* Actually set the qids for the slave */
1476         update_slave->queue_id = qid;
1477
1478 out:
1479         rtnl_unlock();
1480         return ret;
1481
1482 err_no_cmd:
1483         pr_info("invalid input for queue_id set for %s.\n",
1484                 bond->dev->name);
1485         ret = -EPERM;
1486         goto out;
1487 }
1488
1489 static DEVICE_ATTR(queue_id, S_IRUGO | S_IWUSR, bonding_show_queue_id,
1490                    bonding_store_queue_id);
1491
1492
1493 /*
1494  * Show and set the all_slaves_active flag.
1495  */
1496 static ssize_t bonding_show_slaves_active(struct device *d,
1497                                           struct device_attribute *attr,
1498                                           char *buf)
1499 {
1500         struct bonding *bond = to_bond(d);
1501
1502         return sprintf(buf, "%d\n", bond->params.all_slaves_active);
1503 }
1504
1505 static ssize_t bonding_store_slaves_active(struct device *d,
1506                                            struct device_attribute *attr,
1507                                            const char *buf, size_t count)
1508 {
1509         struct bonding *bond = to_bond(d);
1510         int new_value, ret = count;
1511         struct list_head *iter;
1512         struct slave *slave;
1513
1514         if (!rtnl_trylock())
1515                 return restart_syscall();
1516
1517         if (sscanf(buf, "%d", &new_value) != 1) {
1518                 pr_err("%s: no all_slaves_active value specified.\n",
1519                        bond->dev->name);
1520                 ret = -EINVAL;
1521                 goto out;
1522         }
1523
1524         if (new_value == bond->params.all_slaves_active)
1525                 goto out;
1526
1527         if ((new_value == 0) || (new_value == 1)) {
1528                 bond->params.all_slaves_active = new_value;
1529         } else {
1530                 pr_info("%s: Ignoring invalid all_slaves_active value %d.\n",
1531                         bond->dev->name, new_value);
1532                 ret = -EINVAL;
1533                 goto out;
1534         }
1535
1536         bond_for_each_slave(bond, slave, iter) {
1537                 if (!bond_is_active_slave(slave)) {
1538                         if (new_value)
1539                                 slave->inactive = 0;
1540                         else
1541                                 slave->inactive = 1;
1542                 }
1543         }
1544 out:
1545         rtnl_unlock();
1546         return ret;
1547 }
1548 static DEVICE_ATTR(all_slaves_active, S_IRUGO | S_IWUSR,
1549                    bonding_show_slaves_active, bonding_store_slaves_active);
1550
1551 /*
1552  * Show and set the number of IGMP membership reports to send on link failure
1553  */
1554 static ssize_t bonding_show_resend_igmp(struct device *d,
1555                                         struct device_attribute *attr,
1556                                         char *buf)
1557 {
1558         struct bonding *bond = to_bond(d);
1559
1560         return sprintf(buf, "%d\n", bond->params.resend_igmp);
1561 }
1562
1563 static ssize_t bonding_store_resend_igmp(struct device *d,
1564                                          struct device_attribute *attr,
1565                                          const char *buf, size_t count)
1566 {
1567         int new_value, ret = count;
1568         struct bonding *bond = to_bond(d);
1569
1570         if (sscanf(buf, "%d", &new_value) != 1) {
1571                 pr_err("%s: no resend_igmp value specified.\n",
1572                        bond->dev->name);
1573                 ret = -EINVAL;
1574                 goto out;
1575         }
1576
1577         if (new_value < 0 || new_value > 255) {
1578                 pr_err("%s: Invalid resend_igmp value %d not in range 0-255; rejected.\n",
1579                        bond->dev->name, new_value);
1580                 ret = -EINVAL;
1581                 goto out;
1582         }
1583
1584         pr_info("%s: Setting resend_igmp to %d.\n",
1585                 bond->dev->name, new_value);
1586         bond->params.resend_igmp = new_value;
1587 out:
1588         return ret;
1589 }
1590
1591 static DEVICE_ATTR(resend_igmp, S_IRUGO | S_IWUSR,
1592                    bonding_show_resend_igmp, bonding_store_resend_igmp);
1593
1594
1595 static ssize_t bonding_show_lp_interval(struct device *d,
1596                                         struct device_attribute *attr,
1597                                         char *buf)
1598 {
1599         struct bonding *bond = to_bond(d);
1600         return sprintf(buf, "%d\n", bond->params.lp_interval);
1601 }
1602
1603 static ssize_t bonding_store_lp_interval(struct device *d,
1604                                          struct device_attribute *attr,
1605                                          const char *buf, size_t count)
1606 {
1607         struct bonding *bond = to_bond(d);
1608         int new_value, ret = count;
1609
1610         if (sscanf(buf, "%d", &new_value) != 1) {
1611                 pr_err("%s: no lp interval value specified.\n",
1612                         bond->dev->name);
1613                 ret = -EINVAL;
1614                 goto out;
1615         }
1616
1617         if (new_value <= 0) {
1618                 pr_err ("%s: lp_interval must be between 1 and %d\n",
1619                         bond->dev->name, INT_MAX);
1620                 ret = -EINVAL;
1621                 goto out;
1622         }
1623
1624         bond->params.lp_interval = new_value;
1625 out:
1626         return ret;
1627 }
1628
1629 static DEVICE_ATTR(lp_interval, S_IRUGO | S_IWUSR,
1630                    bonding_show_lp_interval, bonding_store_lp_interval);
1631
1632 static ssize_t bonding_show_packets_per_slave(struct device *d,
1633                                               struct device_attribute *attr,
1634                                               char *buf)
1635 {
1636         struct bonding *bond = to_bond(d);
1637         unsigned int packets_per_slave = bond->params.packets_per_slave;
1638
1639         if (packets_per_slave > 1)
1640                 packets_per_slave = reciprocal_value(packets_per_slave);
1641
1642         return sprintf(buf, "%u\n", packets_per_slave);
1643 }
1644
1645 static ssize_t bonding_store_packets_per_slave(struct device *d,
1646                                                struct device_attribute *attr,
1647                                                const char *buf, size_t count)
1648 {
1649         struct bonding *bond = to_bond(d);
1650         int new_value, ret = count;
1651
1652         if (sscanf(buf, "%d", &new_value) != 1) {
1653                 pr_err("%s: no packets_per_slave value specified.\n",
1654                        bond->dev->name);
1655                 ret = -EINVAL;
1656                 goto out;
1657         }
1658         if (new_value < 0 || new_value > USHRT_MAX) {
1659                 pr_err("%s: packets_per_slave must be between 0 and %u\n",
1660                        bond->dev->name, USHRT_MAX);
1661                 ret = -EINVAL;
1662                 goto out;
1663         }
1664         if (bond->params.mode != BOND_MODE_ROUNDROBIN)
1665                 pr_warn("%s: Warning: packets_per_slave has effect only in balance-rr mode\n",
1666                         bond->dev->name);
1667         if (new_value > 1)
1668                 bond->params.packets_per_slave = reciprocal_value(new_value);
1669         else
1670                 bond->params.packets_per_slave = new_value;
1671 out:
1672         return ret;
1673 }
1674
1675 static DEVICE_ATTR(packets_per_slave, S_IRUGO | S_IWUSR,
1676                    bonding_show_packets_per_slave,
1677                    bonding_store_packets_per_slave);
1678
1679 static struct attribute *per_bond_attrs[] = {
1680         &dev_attr_slaves.attr,
1681         &dev_attr_mode.attr,
1682         &dev_attr_fail_over_mac.attr,
1683         &dev_attr_arp_validate.attr,
1684         &dev_attr_arp_all_targets.attr,
1685         &dev_attr_arp_interval.attr,
1686         &dev_attr_arp_ip_target.attr,
1687         &dev_attr_downdelay.attr,
1688         &dev_attr_updelay.attr,
1689         &dev_attr_lacp_rate.attr,
1690         &dev_attr_ad_select.attr,
1691         &dev_attr_xmit_hash_policy.attr,
1692         &dev_attr_num_grat_arp.attr,
1693         &dev_attr_num_unsol_na.attr,
1694         &dev_attr_miimon.attr,
1695         &dev_attr_primary.attr,
1696         &dev_attr_primary_reselect.attr,
1697         &dev_attr_use_carrier.attr,
1698         &dev_attr_active_slave.attr,
1699         &dev_attr_mii_status.attr,
1700         &dev_attr_ad_aggregator.attr,
1701         &dev_attr_ad_num_ports.attr,
1702         &dev_attr_ad_actor_key.attr,
1703         &dev_attr_ad_partner_key.attr,
1704         &dev_attr_ad_partner_mac.attr,
1705         &dev_attr_queue_id.attr,
1706         &dev_attr_all_slaves_active.attr,
1707         &dev_attr_resend_igmp.attr,
1708         &dev_attr_min_links.attr,
1709         &dev_attr_lp_interval.attr,
1710         &dev_attr_packets_per_slave.attr,
1711         NULL,
1712 };
1713
1714 static struct attribute_group bonding_group = {
1715         .name = "bonding",
1716         .attrs = per_bond_attrs,
1717 };
1718
1719 /*
1720  * Initialize sysfs.  This sets up the bonding_masters file in
1721  * /sys/class/net.
1722  */
1723 int bond_create_sysfs(struct bond_net *bn)
1724 {
1725         int ret;
1726
1727         bn->class_attr_bonding_masters = class_attr_bonding_masters;
1728         sysfs_attr_init(&bn->class_attr_bonding_masters.attr);
1729
1730         ret = netdev_class_create_file_ns(&bn->class_attr_bonding_masters,
1731                                           bn->net);
1732         /*
1733          * Permit multiple loads of the module by ignoring failures to
1734          * create the bonding_masters sysfs file.  Bonding devices
1735          * created by second or subsequent loads of the module will
1736          * not be listed in, or controllable by, bonding_masters, but
1737          * will have the usual "bonding" sysfs directory.
1738          *
1739          * This is done to preserve backwards compatibility for
1740          * initscripts/sysconfig, which load bonding multiple times to
1741          * configure multiple bonding devices.
1742          */
1743         if (ret == -EEXIST) {
1744                 /* Is someone being kinky and naming a device bonding_master? */
1745                 if (__dev_get_by_name(bn->net,
1746                                       class_attr_bonding_masters.attr.name))
1747                         pr_err("network device named %s already exists in sysfs",
1748                                class_attr_bonding_masters.attr.name);
1749                 ret = 0;
1750         }
1751
1752         return ret;
1753
1754 }
1755
1756 /*
1757  * Remove /sys/class/net/bonding_masters.
1758  */
1759 void bond_destroy_sysfs(struct bond_net *bn)
1760 {
1761         netdev_class_remove_file_ns(&bn->class_attr_bonding_masters, bn->net);
1762 }
1763
1764 /*
1765  * Initialize sysfs for each bond.  This sets up and registers
1766  * the 'bondctl' directory for each individual bond under /sys/class/net.
1767  */
1768 void bond_prepare_sysfs_group(struct bonding *bond)
1769 {
1770         bond->dev->sysfs_groups[0] = &bonding_group;
1771 }
1772