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