drivers/net/bonding/bond_sysfs.c

   1 /*
   2  * Copyright(c) 2004-2005 Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  */
  22
  23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  24
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/device.h>
  28 #include <linux/sched.h>
  29 #include <linux/fs.h>
  30 #include <linux/types.h>
  31 #include <linux/string.h>
  32 #include <linux/netdevice.h>
  33 #include <linux/inetdevice.h>
  34 #include <linux/in.h>
  35 #include <linux/sysfs.h>
  36 #include <linux/ctype.h>
  37 #include <linux/inet.h>
  38 #include <linux/rtnetlink.h>
  39 #include <linux/etherdevice.h>
  40 #include <net/net_namespace.h>
  41 #include <net/netns/generic.h>
  42 #include <linux/nsproxy.h>
  43
  44 #include "bonding.h"
  45
  46 #define to_dev(obj)     container_of(obj, struct device, kobj)
  47 #define to_bond(cd)     ((struct bonding *)(netdev_priv(to_net_dev(cd))))
  48
  49 /*
  50  * "show" function for the bond_masters attribute.
  51  * The class parameter is ignored.
  52  */
  53 static ssize_t bonding_show_bonds(struct class *cls,
  54                                   struct class_attribute *attr,
  55                                   char *buf)
  56 {
  57         struct bond_net *bn =
  58                 container_of(attr, struct bond_net, class_attr_bonding_masters);
  59         int res = 0;
  60         struct bonding *bond;
  61
  62         rtnl_lock();
  63
  64         list_for_each_entry(bond, &bn->dev_list, bond_list) {
  65                 if (res > (PAGE_SIZE - IFNAMSIZ)) {
  66                         /* not enough space for another interface name */
  67                         if ((PAGE_SIZE - res) > 10)
  68                                 res = PAGE_SIZE - 10;
  69                         res += sprintf(buf + res, "++more++ ");
  70                         break;
  71                 }
  72                 res += sprintf(buf + res, "%s ", bond->dev->name);
  73         }
  74         if (res)
  75                 buf[res-1] = '\n'; /* eat the leftover space */
  76
  77         rtnl_unlock();
  78         return res;
  79 }
  80
  81 static struct net_device *bond_get_by_name(struct bond_net *bn, const char *ifname)
  82 {
  83         struct bonding *bond;
  84
  85         list_for_each_entry(bond, &bn->dev_list, bond_list) {
  86                 if (strncmp(bond->dev->name, ifname, IFNAMSIZ) == 0)
  87                         return bond->dev;
  88         }
  89         return NULL;
  90 }
  91
  92 /*
  93  * "store" function for the bond_masters attribute.  This is what
  94  * creates and deletes entire bonds.
  95  *
  96  * The class parameter is ignored.
  97  *
  98  */
  99
 100 static ssize_t bonding_store_bonds(struct class *cls,
 101                                    struct class_attribute *attr,
 102                                    const char *buffer, size_t count)
 103 {
 104         struct bond_net *bn =
 105                 container_of(attr, struct bond_net, class_attr_bonding_masters);
 106         char command[IFNAMSIZ + 1] = {0, };
 107         char *ifname;
 108         int rv, res = count;
 109
 110         sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
 111         ifname = command + 1;
 112         if ((strlen(command) <= 1) ||
 113             !dev_valid_name(ifname))
 114                 goto err_no_cmd;
 115
 116         if (command[0] == '+') {
 117                 pr_info("%s is being created...\n", ifname);
 118                 rv = bond_create(bn->net, ifname);
 119                 if (rv) {
 120                         if (rv == -EEXIST)
 121                                 pr_info("%s already exists.\n", ifname);
 122                         else
 123                                 pr_info("%s creation failed.\n", ifname);
 124                         res = rv;
 125                 }
 126         } else if (command[0] == '-') {
 127                 struct net_device *bond_dev;
 128
 129                 rtnl_lock();
 130                 bond_dev = bond_get_by_name(bn, ifname);
 131                 if (bond_dev) {
 132                         pr_info("%s is being deleted...\n", ifname);
 133                         unregister_netdevice(bond_dev);
 134                 } else {
 135                         pr_err("unable to delete non-existent %s\n", ifname);
 136                         res = -ENODEV;
 137                 }
 138                 rtnl_unlock();
 139         } else
 140                 goto err_no_cmd;
 141
 142         /* Always return either count or an error.  If you return 0, you'll
 143          * get called forever, which is bad.
 144          */
 145         return res;
 146
 147 err_no_cmd:
 148         pr_err("no command found in bonding_masters. Use +ifname or -ifname.\n");
 149         return -EPERM;
 150 }
 151
 152 static const void *bonding_namespace(struct class *cls,
 153                                      const struct class_attribute *attr)
 154 {
 155         const struct bond_net *bn =
 156                 container_of(attr, struct bond_net, class_attr_bonding_masters);
 157         return bn->net;
 158 }
 159
 160 /* class attribute for bond_masters file.  This ends up in /sys/class/net */
 161 static const struct class_attribute class_attr_bonding_masters = {
 162         .attr = {
 163                 .name = "bonding_masters",
 164                 .mode = S_IWUSR | S_IRUGO,
 165         },
 166         .show = bonding_show_bonds,
 167         .store = bonding_store_bonds,
 168         .namespace = bonding_namespace,
 169 };
 170
 171 int bond_create_slave_symlinks(struct net_device *master,
 172                                struct net_device *slave)
 173 {
 174         char linkname[IFNAMSIZ+7];
 175         int ret = 0;
 176
 177         /* first, create a link from the slave back to the master */
 178         ret = sysfs_create_link(&(slave->dev.kobj), &(master->dev.kobj),
 179                                 "master");
 180         if (ret)
 181                 return ret;
 182         /* next, create a link from the master to the slave */
 183         sprintf(linkname, "slave_%s", slave->name);
 184         ret = sysfs_create_link(&(master->dev.kobj), &(slave->dev.kobj),
 185                                 linkname);
 186
 187         /* free the master link created earlier in case of error */
 188         if (ret)
 189                 sysfs_remove_link(&(slave->dev.kobj), "master");
 190
 191         return ret;
 192
 193 }
 194
 195 void bond_destroy_slave_symlinks(struct net_device *master,
 196                                  struct net_device *slave)
 197 {
 198         char linkname[IFNAMSIZ+7];
 199
 200         sysfs_remove_link(&(slave->dev.kobj), "master");
 201         sprintf(linkname, "slave_%s", slave->name);
 202         sysfs_remove_link(&(master->dev.kobj), linkname);
 203 }
 204
 205
 206 /*
 207  * Show the slaves in the current bond.
 208  */
 209 static ssize_t bonding_show_slaves(struct device *d,
 210                                    struct device_attribute *attr, char *buf)
 211 {
 212         struct slave *slave;
 213         int i, res = 0;
 214         struct bonding *bond = to_bond(d);
 215
 216         read_lock(&bond->lock);
 217         bond_for_each_slave(bond, slave, i) {
 218                 if (res > (PAGE_SIZE - IFNAMSIZ)) {
 219                         /* not enough space for another interface name */
 220                         if ((PAGE_SIZE - res) > 10)
 221                                 res = PAGE_SIZE - 10;
 222                         res += sprintf(buf + res, "++more++ ");
 223                         break;
 224                 }
 225                 res += sprintf(buf + res, "%s ", slave->dev->name);
 226         }
 227         read_unlock(&bond->lock);
 228         if (res)
 229                 buf[res-1] = '\n'; /* eat the leftover space */
 230         return res;
 231 }
 232
 233 /*
 234  * Set the slaves in the current bond.  The bond interface must be
 235  * up for this to succeed.
 236  * This is supposed to be only thin wrapper for bond_enslave and bond_release.
 237  * All hard work should be done there.
 238  */
 239 static ssize_t bonding_store_slaves(struct device *d,
 240                                     struct device_attribute *attr,
 241                                     const char *buffer, size_t count)
 242 {
 243         char command[IFNAMSIZ + 1] = { 0, };
 244         char *ifname;
 245         int res, ret = count;
 246         struct net_device *dev;
 247         struct bonding *bond = to_bond(d);
 248
 249         if (!rtnl_trylock())
 250                 return restart_syscall();
 251
 252         sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
 253         ifname = command + 1;
 254         if ((strlen(command) <= 1) ||
 255             !dev_valid_name(ifname))
 256                 goto err_no_cmd;
 257
 258         dev = __dev_get_by_name(dev_net(bond->dev), ifname);
 259         if (!dev) {
 260                 pr_info("%s: Interface %s does not exist!\n",
 261                         bond->dev->name, ifname);
 262                 ret = -ENODEV;
 263                 goto out;
 264         }
 265
 266         switch (command[0]) {
 267         case '+':
 268                 pr_info("%s: Adding slave %s.\n", bond->dev->name, dev->name);
 269                 res = bond_enslave(bond->dev, dev);
 270                 break;
 271
 272         case '-':
 273                 pr_info("%s: Removing slave %s.\n", bond->dev->name, dev->name);
 274                 res = bond_release(bond->dev, dev);
 275                 break;
 276
 277         default:
 278                 goto err_no_cmd;
 279         }
 280
 281         if (res)
 282                 ret = res;
 283         goto out;
 284
 285 err_no_cmd:
 286         pr_err("no command found in slaves file for bond %s. Use +ifname or -ifname.\n",
 287                bond->dev->name);
 288         ret = -EPERM;
 289
 290 out:
 291         rtnl_unlock();
 292         return ret;
 293 }
 294
 295 static DEVICE_ATTR(slaves, S_IRUGO | S_IWUSR, bonding_show_slaves,
 296                    bonding_store_slaves);
 297
 298 /*
 299  * Show and set the bonding mode.  The bond interface must be down to
 300  * change the mode.
 301  */
 302 static ssize_t bonding_show_mode(struct device *d,
 303                                  struct device_attribute *attr, char *buf)
 304 {
 305         struct bonding *bond = to_bond(d);
 306
 307         return sprintf(buf, "%s %d\n",
 308                         bond_mode_tbl[bond->params.mode].modename,
 309                         bond->params.mode);
 310 }
 311
 312 static ssize_t bonding_store_mode(struct device *d,
 313                                   struct device_attribute *attr,
 314                                   const char *buf, size_t count)
 315 {
 316         int new_value, ret = count;
 317         struct bonding *bond = to_bond(d);
 318
 319         if (!rtnl_trylock())
 320                 return restart_syscall();
 321
 322         if (bond->dev->flags & IFF_UP) {
 323                 pr_err("unable to update mode of %s because interface is up.\n",
 324                        bond->dev->name);
 325                 ret = -EPERM;
 326                 goto out;
 327         }
 328
 329         if (bond->slave_cnt > 0) {
 330                 pr_err("unable to update mode of %s because it has slaves.\n",
 331                         bond->dev->name);
 332                 ret = -EPERM;
 333                 goto out;
 334         }
 335
 336         new_value = bond_parse_parm(buf, bond_mode_tbl);
 337         if (new_value < 0)  {
 338                 pr_err("%s: Ignoring invalid mode value %.*s.\n",
 339                        bond->dev->name, (int)strlen(buf) - 1, buf);
 340                 ret = -EINVAL;
 341                 goto out;
 342         }
 343         if ((new_value == BOND_MODE_ALB ||
 344              new_value == BOND_MODE_TLB) &&
 345             bond->params.arp_interval) {
 346                 pr_err("%s: %s mode is incompatible with arp monitoring.\n",
 347                        bond->dev->name, bond_mode_tbl[new_value].modename);
 348                 ret = -EINVAL;
 349                 goto out;
 350         }
 351
 352         bond->params.mode = new_value;
 353         bond_set_mode_ops(bond, bond->params.mode);
 354         pr_info("%s: setting mode to %s (%d).\n",
 355                 bond->dev->name, bond_mode_tbl[new_value].modename,
 356                 new_value);
 357 out:
 358         rtnl_unlock();
 359         return ret;
 360 }
 361 static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
 362                    bonding_show_mode, bonding_store_mode);
 363
 364 /*
 365  * Show and set the bonding transmit hash method.
 366  * The bond interface must be down to change the xmit hash policy.
 367  */
 368 static ssize_t bonding_show_xmit_hash(struct device *d,
 369                                       struct device_attribute *attr,
 370                                       char *buf)
 371 {
 372         struct bonding *bond = to_bond(d);
 373
 374         return sprintf(buf, "%s %d\n",
 375                        xmit_hashtype_tbl[bond->params.xmit_policy].modename,
 376                        bond->params.xmit_policy);
 377 }
 378
 379 static ssize_t bonding_store_xmit_hash(struct device *d,
 380                                        struct device_attribute *attr,
 381                                        const char *buf, size_t count)
 382 {
 383         int new_value, ret = count;
 384         struct bonding *bond = to_bond(d);
 385
 386         if (bond->dev->flags & IFF_UP) {
 387                 pr_err("%s: Interface is up. Unable to update xmit policy.\n",
 388                        bond->dev->name);
 389                 ret = -EPERM;
 390                 goto out;
 391         }
 392
 393         new_value = bond_parse_parm(buf, xmit_hashtype_tbl);
 394         if (new_value < 0)  {
 395                 pr_err("%s: Ignoring invalid xmit hash policy value %.*s.\n",
 396                        bond->dev->name,
 397                        (int)strlen(buf) - 1, buf);
 398                 ret = -EINVAL;
 399                 goto out;
 400         } else {
 401                 bond->params.xmit_policy = new_value;
 402                 bond_set_mode_ops(bond, bond->params.mode);
 403                 pr_info("%s: setting xmit hash policy to %s (%d).\n",
 404                         bond->dev->name,
 405                         xmit_hashtype_tbl[new_value].modename, new_value);
 406         }
 407 out:
 408         return ret;
 409 }
 410 static DEVICE_ATTR(xmit_hash_policy, S_IRUGO | S_IWUSR,
 411                    bonding_show_xmit_hash, bonding_store_xmit_hash);
 412
 413 /*
 414  * Show and set arp_validate.
 415  */
 416 static ssize_t bonding_show_arp_validate(struct device *d,
 417                                          struct device_attribute *attr,
 418                                          char *buf)
 419 {
 420         struct bonding *bond = to_bond(d);
 421
 422         return sprintf(buf, "%s %d\n",
 423                        arp_validate_tbl[bond->params.arp_validate].modename,
 424                        bond->params.arp_validate);
 425 }
 426
 427 static ssize_t bonding_store_arp_validate(struct device *d,
 428                                           struct device_attribute *attr,
 429                                           const char *buf, size_t count)
 430 {
 431         int new_value;
 432         struct bonding *bond = to_bond(d);
 433
 434         new_value = bond_parse_parm(buf, arp_validate_tbl);
 435         if (new_value < 0) {
 436                 pr_err("%s: Ignoring invalid arp_validate value %s\n",
 437                        bond->dev->name, buf);
 438                 return -EINVAL;
 439         }
 440         if (new_value && (bond->params.mode != BOND_MODE_ACTIVEBACKUP)) {
 441                 pr_err("%s: arp_validate only supported in active-backup mode.\n",
 442                        bond->dev->name);
 443                 return -EINVAL;
 444         }
 445         pr_info("%s: setting arp_validate to %s (%d).\n",
 446                 bond->dev->name, arp_validate_tbl[new_value].modename,
 447                 new_value);
 448
 449         bond->params.arp_validate = new_value;
 450
 451         return count;
 452 }
 453
 454 static DEVICE_ATTR(arp_validate, S_IRUGO | S_IWUSR, bonding_show_arp_validate,
 455                    bonding_store_arp_validate);
 456
 457 /*
 458  * Show and store fail_over_mac.  User only allowed to change the
 459  * value when there are no slaves.
 460  */
 461 static ssize_t bonding_show_fail_over_mac(struct device *d,
 462                                           struct device_attribute *attr,
 463                                           char *buf)
 464 {
 465         struct bonding *bond = to_bond(d);
 466
 467         return sprintf(buf, "%s %d\n",
 468                        fail_over_mac_tbl[bond->params.fail_over_mac].modename,
 469                        bond->params.fail_over_mac);
 470 }
 471
 472 static ssize_t bonding_store_fail_over_mac(struct device *d,
 473                                            struct device_attribute *attr,
 474                                            const char *buf, size_t count)
 475 {
 476         int new_value;
 477         struct bonding *bond = to_bond(d);
 478
 479         if (bond->slave_cnt != 0) {
 480                 pr_err("%s: Can't alter fail_over_mac with slaves in bond.\n",
 481                        bond->dev->name);
 482                 return -EPERM;
 483         }
 484
 485         new_value = bond_parse_parm(buf, fail_over_mac_tbl);
 486         if (new_value < 0) {
 487                 pr_err("%s: Ignoring invalid fail_over_mac value %s.\n",
 488                        bond->dev->name, buf);
 489                 return -EINVAL;
 490         }
 491
 492         bond->params.fail_over_mac = new_value;
 493         pr_info("%s: Setting fail_over_mac to %s (%d).\n",
 494                 bond->dev->name, fail_over_mac_tbl[new_value].modename,
 495                 new_value);
 496
 497         return count;
 498 }
 499
 500 static DEVICE_ATTR(fail_over_mac, S_IRUGO | S_IWUSR,
 501                    bonding_show_fail_over_mac, bonding_store_fail_over_mac);
 502
 503 /*
 504  * Show and set the arp timer interval.  There are two tricky bits
 505  * here.  First, if ARP monitoring is activated, then we must disable
 506  * MII monitoring.  Second, if the ARP timer isn't running, we must
 507  * start it.
 508  */
 509 static ssize_t bonding_show_arp_interval(struct device *d,
 510                                          struct device_attribute *attr,
 511                                          char *buf)
 512 {
 513         struct bonding *bond = to_bond(d);
 514
 515         return sprintf(buf, "%d\n", bond->params.arp_interval);
 516 }
 517
 518 static ssize_t bonding_store_arp_interval(struct device *d,
 519                                           struct device_attribute *attr,
 520                                           const char *buf, size_t count)
 521 {
 522         int new_value, ret = count;
 523         struct bonding *bond = to_bond(d);
 524
 525         if (!rtnl_trylock())
 526                 return restart_syscall();
 527         if (sscanf(buf, "%d", &new_value) != 1) {
 528                 pr_err("%s: no arp_interval value specified.\n",
 529                        bond->dev->name);
 530                 ret = -EINVAL;
 531                 goto out;
 532         }
 533         if (new_value < 0) {
 534                 pr_err("%s: Invalid arp_interval value %d not in range 0-%d; rejected.\n",
 535                        bond->dev->name, new_value, INT_MAX);
 536                 ret = -EINVAL;
 537                 goto out;
 538         }
 539         if (bond->params.mode == BOND_MODE_ALB ||
 540             bond->params.mode == BOND_MODE_TLB ||
 541             bond->params.mode == BOND_MODE_8023AD) {
 542                 pr_info("%s: ARP monitoring cannot be used with ALB/TLB/802.3ad. Only MII monitoring is supported on %s.\n",
 543                         bond->dev->name, bond->dev->name);
 544                 ret = -EINVAL;
 545                 goto out;
 546         }
 547         pr_info("%s: Setting ARP monitoring interval to %d.\n",
 548                 bond->dev->name, new_value);
 549         bond->params.arp_interval = new_value;
 550         if (new_value) {
 551                 if (bond->params.miimon) {
 552                         pr_info("%s: ARP monitoring cannot be used with MII monitoring. %s Disabling MII monitoring.\n",
 553                                 bond->dev->name, bond->dev->name);
 554                         bond->params.miimon = 0;
 555                 }
 556                 if (!bond->params.arp_targets[0])
 557                         pr_info("%s: ARP monitoring has been set up, but no ARP targets have been specified.\n",
 558                                 bond->dev->name);
 559         }
 560         if (bond->dev->flags & IFF_UP) {
 561                 /* If the interface is up, we may need to fire off
 562                  * the ARP timer.  If the interface is down, the
 563                  * timer will get fired off when the open function
 564                  * is called.
 565                  */
 566                 if (!new_value) {
 567                         cancel_delayed_work_sync(&bond->arp_work);
 568                 } else {
 569                         cancel_delayed_work_sync(&bond->mii_work);
 570                         queue_delayed_work(bond->wq, &bond->arp_work, 0);
 571                 }
 572         }
 573 out:
 574         rtnl_unlock();
 575         return ret;
 576 }
 577 static DEVICE_ATTR(arp_interval, S_IRUGO | S_IWUSR,
 578                    bonding_show_arp_interval, bonding_store_arp_interval);
 579
 580 /*
 581  * Show and set the arp targets.
 582  */
 583 static ssize_t bonding_show_arp_targets(struct device *d,
 584                                         struct device_attribute *attr,
 585                                         char *buf)
 586 {
 587         int i, res = 0;
 588         struct bonding *bond = to_bond(d);
 589
 590         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) {
 591                 if (bond->params.arp_targets[i])
 592                         res += sprintf(buf + res, "%pI4 ",
 593                                        &bond->params.arp_targets[i]);
 594         }
 595         if (res)
 596                 buf[res-1] = '\n'; /* eat the leftover space */
 597         return res;
 598 }
 599
 600 static ssize_t bonding_store_arp_targets(struct device *d,
 601                                          struct device_attribute *attr,
 602                                          const char *buf, size_t count)
 603 {
 604         __be32 newtarget;
 605         int i = 0, done = 0, ret = count;
 606         struct bonding *bond = to_bond(d);
 607         __be32 *targets;
 608
 609         targets = bond->params.arp_targets;
 610         newtarget = in_aton(buf + 1);
 611         /* look for adds */
 612         if (buf[0] == '+') {
 613                 if ((newtarget == 0) || (newtarget == htonl(INADDR_BROADCAST))) {
 614                         pr_err("%s: invalid ARP target %pI4 specified for addition\n",
 615                                bond->dev->name, &newtarget);
 616                         ret = -EINVAL;
 617                         goto out;
 618                 }
 619                 /* look for an empty slot to put the target in, and check for dupes */
 620                 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && !done; i++) {
 621                         if (targets[i] == newtarget) { /* duplicate */
 622                                 pr_err("%s: ARP target %pI4 is already present\n",
 623                                        bond->dev->name, &newtarget);
 624                                 ret = -EINVAL;
 625                                 goto out;
 626                         }
 627                         if (targets[i] == 0) {
 628                                 pr_info("%s: adding ARP target %pI4.\n",
 629                                         bond->dev->name, &newtarget);
 630                                 done = 1;
 631                                 targets[i] = newtarget;
 632                         }
 633                 }
 634                 if (!done) {
 635                         pr_err("%s: ARP target table is full!\n",
 636                                bond->dev->name);
 637                         ret = -EINVAL;
 638                         goto out;
 639                 }
 640
 641         } else if (buf[0] == '-')       {
 642                 if ((newtarget == 0) || (newtarget == htonl(INADDR_BROADCAST))) {
 643                         pr_err("%s: invalid ARP target %pI4 specified for removal\n",
 644                                bond->dev->name, &newtarget);
 645                         ret = -EINVAL;
 646                         goto out;
 647                 }
 648
 649                 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && !done; i++) {
 650                         if (targets[i] == newtarget) {
 651                                 int j;
 652                                 pr_info("%s: removing ARP target %pI4.\n",
 653                                         bond->dev->name, &newtarget);
 654                                 for (j = i; (j < (BOND_MAX_ARP_TARGETS-1)) && targets[j+1]; j++)
 655                                         targets[j] = targets[j+1];
 656
 657                                 targets[j] = 0;
 658                                 done = 1;
 659                         }
 660                 }
 661                 if (!done) {
 662                         pr_info("%s: unable to remove nonexistent ARP target %pI4.\n",
 663                                 bond->dev->name, &newtarget);
 664                         ret = -EINVAL;
 665                         goto out;
 666                 }
 667         } else {
 668                 pr_err("no command found in arp_ip_targets file for bond %s. Use +<addr> or -<addr>.\n",
 669                        bond->dev->name);
 670                 ret = -EPERM;
 671                 goto out;
 672         }
 673
 674 out:
 675         return ret;
 676 }
 677 static DEVICE_ATTR(arp_ip_target, S_IRUGO | S_IWUSR , bonding_show_arp_targets, bonding_store_arp_targets);
 678
 679 /*
 680  * Show and set the up and down delays.  These must be multiples of the
 681  * MII monitoring value, and are stored internally as the multiplier.
 682  * Thus, we must translate to MS for the real world.
 683  */
 684 static ssize_t bonding_show_downdelay(struct device *d,
 685                                       struct device_attribute *attr,
 686                                       char *buf)
 687 {
 688         struct bonding *bond = to_bond(d);
 689
 690         return sprintf(buf, "%d\n", bond->params.downdelay * bond->params.miimon);
 691 }
 692
 693 static ssize_t bonding_store_downdelay(struct device *d,
 694                                        struct device_attribute *attr,
 695                                        const char *buf, size_t count)
 696 {
 697         int new_value, ret = count;
 698         struct bonding *bond = to_bond(d);
 699
 700         if (!rtnl_trylock())
 701                 return restart_syscall();
 702         if (!(bond->params.miimon)) {
 703                 pr_err("%s: Unable to set down delay as MII monitoring is disabled\n",
 704                        bond->dev->name);
 705                 ret = -EPERM;
 706                 goto out;
 707         }
 708
 709         if (sscanf(buf, "%d", &new_value) != 1) {
 710                 pr_err("%s: no down delay value specified.\n", bond->dev->name);
 711                 ret = -EINVAL;
 712                 goto out;
 713         }
 714         if (new_value < 0) {
 715                 pr_err("%s: Invalid down delay value %d not in range %d-%d; rejected.\n",
 716                        bond->dev->name, new_value, 0, INT_MAX);
 717                 ret = -EINVAL;
 718                 goto out;
 719         } else {
 720                 if ((new_value % bond->params.miimon) != 0) {
 721                         pr_warning("%s: Warning: down delay (%d) is not a multiple of miimon (%d), delay rounded to %d ms\n",
 722                                    bond->dev->name, new_value,
 723                                    bond->params.miimon,
 724                                    (new_value / bond->params.miimon) *
 725                                    bond->params.miimon);
 726                 }
 727                 bond->params.downdelay = new_value / bond->params.miimon;
 728                 pr_info("%s: Setting down delay to %d.\n",
 729                         bond->dev->name,
 730                         bond->params.downdelay * bond->params.miimon);
 731
 732         }
 733
 734 out:
 735         rtnl_unlock();
 736         return ret;
 737 }
 738 static DEVICE_ATTR(downdelay, S_IRUGO | S_IWUSR,
 739                    bonding_show_downdelay, bonding_store_downdelay);
 740
 741 static ssize_t bonding_show_updelay(struct device *d,
 742                                     struct device_attribute *attr,
 743                                     char *buf)
 744 {
 745         struct bonding *bond = to_bond(d);
 746
 747         return sprintf(buf, "%d\n", bond->params.updelay * bond->params.miimon);
 748
 749 }
 750
 751 static ssize_t bonding_store_updelay(struct device *d,
 752                                      struct device_attribute *attr,
 753                                      const char *buf, size_t count)
 754 {
 755         int new_value, ret = count;
 756         struct bonding *bond = to_bond(d);
 757
 758         if (!rtnl_trylock())
 759                 return restart_syscall();
 760         if (!(bond->params.miimon)) {
 761                 pr_err("%s: Unable to set up delay as MII monitoring is disabled\n",
 762                        bond->dev->name);
 763                 ret = -EPERM;
 764                 goto out;
 765         }
 766
 767         if (sscanf(buf, "%d", &new_value) != 1) {
 768                 pr_err("%s: no up delay value specified.\n",
 769                        bond->dev->name);
 770                 ret = -EINVAL;
 771                 goto out;
 772         }
 773         if (new_value < 0) {
 774                 pr_err("%s: Invalid up delay value %d not in range %d-%d; rejected.\n",
 775                        bond->dev->name, new_value, 0, INT_MAX);
 776                 ret = -EINVAL;
 777                 goto out;
 778         } else {
 779                 if ((new_value % bond->params.miimon) != 0) {
 780                         pr_warning("%s: Warning: up delay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
 781                                    bond->dev->name, new_value,
 782                                    bond->params.miimon,
 783                                    (new_value / bond->params.miimon) *
 784                                    bond->params.miimon);
 785                 }
 786                 bond->params.updelay = new_value / bond->params.miimon;
 787                 pr_info("%s: Setting up delay to %d.\n",
 788                         bond->dev->name,
 789                         bond->params.updelay * bond->params.miimon);
 790         }
 791
 792 out:
 793         rtnl_unlock();
 794         return ret;
 795 }
 796 static DEVICE_ATTR(updelay, S_IRUGO | S_IWUSR,
 797                    bonding_show_updelay, bonding_store_updelay);
 798
 799 /*
 800  * Show and set the LACP interval.  Interface must be down, and the mode
 801  * must be set to 802.3ad mode.
 802  */
 803 static ssize_t bonding_show_lacp(struct device *d,
 804                                  struct device_attribute *attr,
 805                                  char *buf)
 806 {
 807         struct bonding *bond = to_bond(d);
 808
 809         return sprintf(buf, "%s %d\n",
 810                 bond_lacp_tbl[bond->params.lacp_fast].modename,
 811                 bond->params.lacp_fast);
 812 }
 813
 814 static ssize_t bonding_store_lacp(struct device *d,
 815                                   struct device_attribute *attr,
 816                                   const char *buf, size_t count)
 817 {
 818         int new_value, ret = count;
 819         struct bonding *bond = to_bond(d);
 820
 821         if (bond->dev->flags & IFF_UP) {
 822                 pr_err("%s: Unable to update LACP rate because interface is up.\n",
 823                        bond->dev->name);
 824                 ret = -EPERM;
 825                 goto out;
 826         }
 827
 828         if (bond->params.mode != BOND_MODE_8023AD) {
 829                 pr_err("%s: Unable to update LACP rate because bond is not in 802.3ad mode.\n",
 830                        bond->dev->name);
 831                 ret = -EPERM;
 832                 goto out;
 833         }
 834
 835         new_value = bond_parse_parm(buf, bond_lacp_tbl);
 836
 837         if ((new_value == 1) || (new_value == 0)) {
 838                 bond->params.lacp_fast = new_value;
 839                 bond_3ad_update_lacp_rate(bond);
 840                 pr_info("%s: Setting LACP rate to %s (%d).\n",
 841                         bond->dev->name, bond_lacp_tbl[new_value].modename,
 842                         new_value);
 843         } else {
 844                 pr_err("%s: Ignoring invalid LACP rate value %.*s.\n",
 845                        bond->dev->name, (int)strlen(buf) - 1, buf);
 846                 ret = -EINVAL;
 847         }
 848 out:
 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         int i;
1053         struct slave *slave;
1054         struct bonding *bond = to_bond(d);
1055         char ifname[IFNAMSIZ];
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, i) {
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 slave *curr;
1211         struct bonding *bond = to_bond(d);
1212         int count = 0;
1213
1214         read_lock(&bond->curr_slave_lock);
1215         curr = bond->curr_active_slave;
1216         read_unlock(&bond->curr_slave_lock);
1217
1218         if (USES_PRIMARY(bond->params.mode) && curr)
1219                 count = sprintf(buf, "%s\n", curr->dev->name);
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 i;
1228         struct slave *slave;
1229         struct slave *old_active = NULL;
1230         struct slave *new_active = NULL;
1231         struct bonding *bond = to_bond(d);
1232         char ifname[IFNAMSIZ];
1233
1234         if (!rtnl_trylock())
1235                 return restart_syscall();
1236
1237         block_netpoll_tx();
1238         read_lock(&bond->lock);
1239         write_lock_bh(&bond->curr_slave_lock);
1240
1241         if (!USES_PRIMARY(bond->params.mode)) {
1242                 pr_info("%s: Unable to change active slave; %s is in mode %d\n",
1243                         bond->dev->name, bond->dev->name, bond->params.mode);
1244                 goto out;
1245         }
1246
1247         sscanf(buf, "%15s", ifname); /* IFNAMSIZ */
1248
1249         /* check to see if we are clearing active */
1250         if (!strlen(ifname) || buf[0] == '\n') {
1251                 pr_info("%s: Clearing current active slave.\n",
1252                         bond->dev->name);
1253                 bond->curr_active_slave = NULL;
1254                 bond_select_active_slave(bond);
1255                 goto out;
1256         }
1257
1258         bond_for_each_slave(bond, slave, i) {
1259                 if (strncmp(slave->dev->name, ifname, IFNAMSIZ) == 0) {
1260                         old_active = bond->curr_active_slave;
1261                         new_active = slave;
1262                         if (new_active == old_active) {
1263                                 /* do nothing */
1264                                 pr_info("%s: %s is already the current"
1265                                         " active slave.\n",
1266                                         bond->dev->name,
1267                                         slave->dev->name);
1268                                 goto out;
1269                         }
1270                         else {
1271                                 if ((new_active) &&
1272                                     (old_active) &&
1273                                     (new_active->link == BOND_LINK_UP) &&
1274                                     IS_UP(new_active->dev)) {
1275                                         pr_info("%s: Setting %s as active"
1276                                                 " slave.\n",
1277                                                 bond->dev->name,
1278                                                 slave->dev->name);
1279                                         bond_change_active_slave(bond,
1280                                                                  new_active);
1281                                 }
1282                                 else {
1283                                         pr_info("%s: Could not set %s as"
1284                                                 " active slave; either %s is"
1285                                                 " down or the link is down.\n",
1286                                                 bond->dev->name,
1287                                                 slave->dev->name,
1288                                                 slave->dev->name);
1289                                 }
1290                                 goto out;
1291                         }
1292                 }
1293         }
1294
1295         pr_info("%s: Unable to set %.*s as active slave.\n",
1296                 bond->dev->name, (int)strlen(buf) - 1, buf);
1297  out:
1298         write_unlock_bh(&bond->curr_slave_lock);
1299         read_unlock(&bond->lock);
1300         unblock_netpoll_tx();
1301
1302         rtnl_unlock();
1303
1304         return count;
1305
1306 }
1307 static DEVICE_ATTR(active_slave, S_IRUGO | S_IWUSR,
1308                    bonding_show_active_slave, bonding_store_active_slave);
1309
1310
1311 /*
1312  * Show link status of the bond interface.
1313  */
1314 static ssize_t bonding_show_mii_status(struct device *d,
1315                                        struct device_attribute *attr,
1316                                        char *buf)
1317 {
1318         struct slave *curr;
1319         struct bonding *bond = to_bond(d);
1320
1321         read_lock(&bond->curr_slave_lock);
1322         curr = bond->curr_active_slave;
1323         read_unlock(&bond->curr_slave_lock);
1324
1325         return sprintf(buf, "%s\n", curr ? "up" : "down");
1326 }
1327 static DEVICE_ATTR(mii_status, S_IRUGO, bonding_show_mii_status, NULL);
1328
1329 /*
1330  * Show current 802.3ad aggregator ID.
1331  */
1332 static ssize_t bonding_show_ad_aggregator(struct device *d,
1333                                           struct device_attribute *attr,
1334                                           char *buf)
1335 {
1336         int count = 0;
1337         struct bonding *bond = to_bond(d);
1338
1339         if (bond->params.mode == BOND_MODE_8023AD) {
1340                 struct ad_info ad_info;
1341                 count = sprintf(buf, "%d\n",
1342                                 bond_3ad_get_active_agg_info(bond, &ad_info)
1343                                 ?  0 : ad_info.aggregator_id);
1344         }
1345
1346         return count;
1347 }
1348 static DEVICE_ATTR(ad_aggregator, S_IRUGO, bonding_show_ad_aggregator, NULL);
1349
1350
1351 /*
1352  * Show number of active 802.3ad ports.
1353  */
1354 static ssize_t bonding_show_ad_num_ports(struct device *d,
1355                                          struct device_attribute *attr,
1356                                          char *buf)
1357 {
1358         int count = 0;
1359         struct bonding *bond = to_bond(d);
1360
1361         if (bond->params.mode == BOND_MODE_8023AD) {
1362                 struct ad_info ad_info;
1363                 count = sprintf(buf, "%d\n",
1364                                 bond_3ad_get_active_agg_info(bond, &ad_info)
1365                                 ?  0 : ad_info.ports);
1366         }
1367
1368         return count;
1369 }
1370 static DEVICE_ATTR(ad_num_ports, S_IRUGO, bonding_show_ad_num_ports, NULL);
1371
1372
1373 /*
1374  * Show current 802.3ad actor key.
1375  */
1376 static ssize_t bonding_show_ad_actor_key(struct device *d,
1377                                          struct device_attribute *attr,
1378                                          char *buf)
1379 {
1380         int count = 0;
1381         struct bonding *bond = to_bond(d);
1382
1383         if (bond->params.mode == BOND_MODE_8023AD) {
1384                 struct ad_info ad_info;
1385                 count = sprintf(buf, "%d\n",
1386                                 bond_3ad_get_active_agg_info(bond, &ad_info)
1387                                 ?  0 : ad_info.actor_key);
1388         }
1389
1390         return count;
1391 }
1392 static DEVICE_ATTR(ad_actor_key, S_IRUGO, bonding_show_ad_actor_key, NULL);
1393
1394
1395 /*
1396  * Show current 802.3ad partner key.
1397  */
1398 static ssize_t bonding_show_ad_partner_key(struct device *d,
1399                                            struct device_attribute *attr,
1400                                            char *buf)
1401 {
1402         int count = 0;
1403         struct bonding *bond = to_bond(d);
1404
1405         if (bond->params.mode == BOND_MODE_8023AD) {
1406                 struct ad_info ad_info;
1407                 count = sprintf(buf, "%d\n",
1408                                 bond_3ad_get_active_agg_info(bond, &ad_info)
1409                                 ?  0 : ad_info.partner_key);
1410         }
1411
1412         return count;
1413 }
1414 static DEVICE_ATTR(ad_partner_key, S_IRUGO, bonding_show_ad_partner_key, NULL);
1415
1416
1417 /*
1418  * Show current 802.3ad partner mac.
1419  */
1420 static ssize_t bonding_show_ad_partner_mac(struct device *d,
1421                                            struct device_attribute *attr,
1422                                            char *buf)
1423 {
1424         int count = 0;
1425         struct bonding *bond = to_bond(d);
1426
1427         if (bond->params.mode == BOND_MODE_8023AD) {
1428                 struct ad_info ad_info;
1429                 if (!bond_3ad_get_active_agg_info(bond, &ad_info))
1430                         count = sprintf(buf, "%pM\n", ad_info.partner_system);
1431         }
1432
1433         return count;
1434 }
1435 static DEVICE_ATTR(ad_partner_mac, S_IRUGO, bonding_show_ad_partner_mac, NULL);
1436
1437 /*
1438  * Show the queue_ids of the slaves in the current bond.
1439  */
1440 static ssize_t bonding_show_queue_id(struct device *d,
1441                                      struct device_attribute *attr,
1442                                      char *buf)
1443 {
1444         struct slave *slave;
1445         int i, res = 0;
1446         struct bonding *bond = to_bond(d);
1447
1448         if (!rtnl_trylock())
1449                 return restart_syscall();
1450
1451         read_lock(&bond->lock);
1452         bond_for_each_slave(bond, slave, i) {
1453                 if (res > (PAGE_SIZE - IFNAMSIZ - 6)) {
1454                         /* not enough space for another interface_name:queue_id pair */
1455                         if ((PAGE_SIZE - res) > 10)
1456                                 res = PAGE_SIZE - 10;
1457                         res += sprintf(buf + res, "++more++ ");
1458                         break;
1459                 }
1460                 res += sprintf(buf + res, "%s:%d ",
1461                                slave->dev->name, slave->queue_id);
1462         }
1463         read_unlock(&bond->lock);
1464         if (res)
1465                 buf[res-1] = '\n'; /* eat the leftover space */
1466         rtnl_unlock();
1467         return res;
1468 }
1469
1470 /*
1471  * Set the queue_ids of the  slaves in the current bond.  The bond
1472  * interface must be enslaved for this to work.
1473  */
1474 static ssize_t bonding_store_queue_id(struct device *d,
1475                                       struct device_attribute *attr,
1476                                       const char *buffer, size_t count)
1477 {
1478         struct slave *slave, *update_slave;
1479         struct bonding *bond = to_bond(d);
1480         u16 qid;
1481         int i, ret = count;
1482         char *delim;
1483         struct net_device *sdev = NULL;
1484
1485         if (!rtnl_trylock())
1486                 return restart_syscall();
1487
1488         /* delim will point to queue id if successful */
1489         delim = strchr(buffer, ':');
1490         if (!delim)
1491                 goto err_no_cmd;
1492
1493         /*
1494          * Terminate string that points to device name and bump it
1495          * up one, so we can read the queue id there.
1496          */
1497         *delim = '\0';
1498         if (sscanf(++delim, "%hd\n", &qid) != 1)
1499                 goto err_no_cmd;
1500
1501         /* Check buffer length, valid ifname and queue id */
1502         if (strlen(buffer) > IFNAMSIZ ||
1503             !dev_valid_name(buffer) ||
1504             qid > bond->dev->real_num_tx_queues)
1505                 goto err_no_cmd;
1506
1507         /* Get the pointer to that interface if it exists */
1508         sdev = __dev_get_by_name(dev_net(bond->dev), buffer);
1509         if (!sdev)
1510                 goto err_no_cmd;
1511
1512         read_lock(&bond->lock);
1513
1514         /* Search for thes slave and check for duplicate qids */
1515         update_slave = NULL;
1516         bond_for_each_slave(bond, slave, i) {
1517                 if (sdev == slave->dev)
1518                         /*
1519                          * We don't need to check the matching
1520                          * slave for dups, since we're overwriting it
1521                          */
1522                         update_slave = slave;
1523                 else if (qid && qid == slave->queue_id) {
1524                         goto err_no_cmd_unlock;
1525                 }
1526         }
1527
1528         if (!update_slave)
1529                 goto err_no_cmd_unlock;
1530
1531         /* Actually set the qids for the slave */
1532         update_slave->queue_id = qid;
1533
1534         read_unlock(&bond->lock);
1535 out:
1536         rtnl_unlock();
1537         return ret;
1538
1539 err_no_cmd_unlock:
1540         read_unlock(&bond->lock);
1541 err_no_cmd:
1542         pr_info("invalid input for queue_id set for %s.\n",
1543                 bond->dev->name);
1544         ret = -EPERM;
1545         goto out;
1546 }
1547
1548 static DEVICE_ATTR(queue_id, S_IRUGO | S_IWUSR, bonding_show_queue_id,
1549                    bonding_store_queue_id);
1550
1551
1552 /*
1553  * Show and set the all_slaves_active flag.
1554  */
1555 static ssize_t bonding_show_slaves_active(struct device *d,
1556                                           struct device_attribute *attr,
1557                                           char *buf)
1558 {
1559         struct bonding *bond = to_bond(d);
1560
1561         return sprintf(buf, "%d\n", bond->params.all_slaves_active);
1562 }
1563
1564 static ssize_t bonding_store_slaves_active(struct device *d,
1565                                            struct device_attribute *attr,
1566                                            const char *buf, size_t count)
1567 {
1568         int i, new_value, ret = count;
1569         struct bonding *bond = to_bond(d);
1570         struct slave *slave;
1571
1572         if (sscanf(buf, "%d", &new_value) != 1) {
1573                 pr_err("%s: no all_slaves_active value specified.\n",
1574                        bond->dev->name);
1575                 ret = -EINVAL;
1576                 goto out;
1577         }
1578
1579         if (new_value == bond->params.all_slaves_active)
1580                 goto out;
1581
1582         if ((new_value == 0) || (new_value == 1)) {
1583                 bond->params.all_slaves_active = new_value;
1584         } else {
1585                 pr_info("%s: Ignoring invalid all_slaves_active value %d.\n",
1586                         bond->dev->name, new_value);
1587                 ret = -EINVAL;
1588                 goto out;
1589         }
1590
1591         read_lock(&bond->lock);
1592         bond_for_each_slave(bond, slave, i) {
1593                 if (!bond_is_active_slave(slave)) {
1594                         if (new_value)
1595                                 slave->inactive = 0;
1596                         else
1597                                 slave->inactive = 1;
1598                 }
1599         }
1600         read_unlock(&bond->lock);
1601 out:
1602         return ret;
1603 }
1604 static DEVICE_ATTR(all_slaves_active, S_IRUGO | S_IWUSR,
1605                    bonding_show_slaves_active, bonding_store_slaves_active);
1606
1607 /*
1608  * Show and set the number of IGMP membership reports to send on link failure
1609  */
1610 static ssize_t bonding_show_resend_igmp(struct device *d,
1611                                         struct device_attribute *attr,
1612                                         char *buf)
1613 {
1614         struct bonding *bond = to_bond(d);
1615
1616         return sprintf(buf, "%d\n", bond->params.resend_igmp);
1617 }
1618
1619 static ssize_t bonding_store_resend_igmp(struct device *d,
1620                                          struct device_attribute *attr,
1621                                          const char *buf, size_t count)
1622 {
1623         int new_value, ret = count;
1624         struct bonding *bond = to_bond(d);
1625
1626         if (sscanf(buf, "%d", &new_value) != 1) {
1627                 pr_err("%s: no resend_igmp value specified.\n",
1628                        bond->dev->name);
1629                 ret = -EINVAL;
1630                 goto out;
1631         }
1632
1633         if (new_value < 0 || new_value > 255) {
1634                 pr_err("%s: Invalid resend_igmp value %d not in range 0-255; rejected.\n",
1635                        bond->dev->name, new_value);
1636                 ret = -EINVAL;
1637                 goto out;
1638         }
1639
1640         pr_info("%s: Setting resend_igmp to %d.\n",
1641                 bond->dev->name, new_value);
1642         bond->params.resend_igmp = new_value;
1643 out:
1644         return ret;
1645 }
1646
1647 static DEVICE_ATTR(resend_igmp, S_IRUGO | S_IWUSR,
1648                    bonding_show_resend_igmp, bonding_store_resend_igmp);
1649
1650 static struct attribute *per_bond_attrs[] = {
1651         &dev_attr_slaves.attr,
1652         &dev_attr_mode.attr,
1653         &dev_attr_fail_over_mac.attr,
1654         &dev_attr_arp_validate.attr,
1655         &dev_attr_arp_interval.attr,
1656         &dev_attr_arp_ip_target.attr,
1657         &dev_attr_downdelay.attr,
1658         &dev_attr_updelay.attr,
1659         &dev_attr_lacp_rate.attr,
1660         &dev_attr_ad_select.attr,
1661         &dev_attr_xmit_hash_policy.attr,
1662         &dev_attr_num_grat_arp.attr,
1663         &dev_attr_num_unsol_na.attr,
1664         &dev_attr_miimon.attr,
1665         &dev_attr_primary.attr,
1666         &dev_attr_primary_reselect.attr,
1667         &dev_attr_use_carrier.attr,
1668         &dev_attr_active_slave.attr,
1669         &dev_attr_mii_status.attr,
1670         &dev_attr_ad_aggregator.attr,
1671         &dev_attr_ad_num_ports.attr,
1672         &dev_attr_ad_actor_key.attr,
1673         &dev_attr_ad_partner_key.attr,
1674         &dev_attr_ad_partner_mac.attr,
1675         &dev_attr_queue_id.attr,
1676         &dev_attr_all_slaves_active.attr,
1677         &dev_attr_resend_igmp.attr,
1678         &dev_attr_min_links.attr,
1679         NULL,
1680 };
1681
1682 static struct attribute_group bonding_group = {
1683         .name = "bonding",
1684         .attrs = per_bond_attrs,
1685 };
1686
1687 /*
1688  * Initialize sysfs.  This sets up the bonding_masters file in
1689  * /sys/class/net.
1690  */
1691 int bond_create_sysfs(struct bond_net *bn)
1692 {
1693         int ret;
1694
1695         bn->class_attr_bonding_masters = class_attr_bonding_masters;
1696         sysfs_attr_init(&bn->class_attr_bonding_masters.attr);
1697
1698         ret = netdev_class_create_file(&bn->class_attr_bonding_masters);
1699         /*
1700          * Permit multiple loads of the module by ignoring failures to
1701          * create the bonding_masters sysfs file.  Bonding devices
1702          * created by second or subsequent loads of the module will
1703          * not be listed in, or controllable by, bonding_masters, but
1704          * will have the usual "bonding" sysfs directory.
1705          *
1706          * This is done to preserve backwards compatibility for
1707          * initscripts/sysconfig, which load bonding multiple times to
1708          * configure multiple bonding devices.
1709          */
1710         if (ret == -EEXIST) {
1711                 /* Is someone being kinky and naming a device bonding_master? */
1712                 if (__dev_get_by_name(bn->net,
1713                                       class_attr_bonding_masters.attr.name))
1714                         pr_err("network device named %s already exists in sysfs",
1715                                class_attr_bonding_masters.attr.name);
1716                 ret = 0;
1717         }
1718
1719         return ret;
1720
1721 }
1722
1723 /*
1724  * Remove /sys/class/net/bonding_masters.
1725  */
1726 void bond_destroy_sysfs(struct bond_net *bn)
1727 {
1728         netdev_class_remove_file(&bn->class_attr_bonding_masters);
1729 }
1730
1731 /*
1732  * Initialize sysfs for each bond.  This sets up and registers
1733  * the 'bondctl' directory for each individual bond under /sys/class/net.
1734  */
1735 void bond_prepare_sysfs_group(struct bonding *bond)
1736 {
1737         bond->dev->sysfs_groups[0] = &bonding_group;
1738 }
1739