SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/device.h>
  25 #include <linux/sched.h>
  26 #include <linux/sysdev.h>
  27 #include <linux/fs.h>
  28 #include <linux/types.h>
  29 #include <linux/string.h>
  30 #include <linux/netdevice.h>
  31 #include <linux/inetdevice.h>
  32 #include <linux/in.h>
  33 #include <linux/sysfs.h>
  34 #include <linux/ctype.h>
  35 #include <linux/inet.h>
  36 #include <linux/rtnetlink.h>
  37 #include <linux/etherdevice.h>
  38 #include <net/net_namespace.h>
  39
  40 #include "bonding.h"
  41
  42 #define to_dev(obj)     container_of(obj, struct device, kobj)
  43 #define to_bond(cd)     ((struct bonding *)(netdev_priv(to_net_dev(cd))))
  44
  45 /*
  46  * "show" function for the bond_masters attribute.
  47  * The class parameter is ignored.
  48  */
  49 static ssize_t bonding_show_bonds(struct class *cls, char *buf)
  50 {
  51         int res = 0;
  52         struct bonding *bond;
  53
  54         rtnl_lock();
  55
  56         list_for_each_entry(bond, &bond_dev_list, bond_list) {
  57                 if (res > (PAGE_SIZE - IFNAMSIZ)) {
  58                         /* not enough space for another interface name */
  59                         if ((PAGE_SIZE - res) > 10)
  60                                 res = PAGE_SIZE - 10;
  61                         res += sprintf(buf + res, "++more++ ");
  62                         break;
  63                 }
  64                 res += sprintf(buf + res, "%s ", bond->dev->name);
  65         }
  66         if (res)
  67                 buf[res-1] = '\n'; /* eat the leftover space */
  68
  69         rtnl_unlock();
  70         return res;
  71 }
  72
  73 static struct net_device *bond_get_by_name(const char *ifname)
  74 {
  75         struct bonding *bond;
  76
  77         list_for_each_entry(bond, &bond_dev_list, bond_list) {
  78                 if (strncmp(bond->dev->name, ifname, IFNAMSIZ) == 0)
  79                         return bond->dev;
  80         }
  81         return NULL;
  82 }
  83
  84 /*
  85  * "store" function for the bond_masters attribute.  This is what
  86  * creates and deletes entire bonds.
  87  *
  88  * The class parameter is ignored.
  89  *
  90  */
  91
  92 static ssize_t bonding_store_bonds(struct class *cls,
  93                                    const char *buffer, size_t count)
  94 {
  95         char command[IFNAMSIZ + 1] = {0, };
  96         char *ifname;
  97         int rv, res = count;
  98
  99         sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
 100         ifname = command + 1;
 101         if ((strlen(command) <= 1) ||
 102             !dev_valid_name(ifname))
 103                 goto err_no_cmd;
 104
 105         if (command[0] == '+') {
 106                 pr_info(DRV_NAME
 107                         ": %s is being created...\n", ifname);
 108                 rv = bond_create(ifname);
 109                 if (rv) {
 110                         pr_info(DRV_NAME ": Bond creation failed.\n");
 111                         res = rv;
 112                 }
 113         } else if (command[0] == '-') {
 114                 struct net_device *bond_dev;
 115
 116                 rtnl_lock();
 117                 bond_dev = bond_get_by_name(ifname);
 118                 if (bond_dev) {
 119                         pr_info(DRV_NAME ": %s is being deleted...\n",
 120                                 ifname);
 121                         unregister_netdevice(bond_dev);
 122                 } else {
 123                         pr_err(DRV_NAME ": unable to delete non-existent %s\n",
 124                                ifname);
 125                         res = -ENODEV;
 126                 }
 127                 rtnl_unlock();
 128         } else
 129                 goto err_no_cmd;
 130
 131         /* Always return either count or an error.  If you return 0, you'll
 132          * get called forever, which is bad.
 133          */
 134         return res;
 135
 136 err_no_cmd:
 137         pr_err(DRV_NAME ": no command found in bonding_masters."
 138                " Use +ifname or -ifname.\n");
 139         return -EPERM;
 140 }
 141
 142 /* class attribute for bond_masters file.  This ends up in /sys/class/net */
 143 static CLASS_ATTR(bonding_masters,  S_IWUSR | S_IRUGO,
 144                   bonding_show_bonds, bonding_store_bonds);
 145
 146 int bond_create_slave_symlinks(struct net_device *master,
 147                                struct net_device *slave)
 148 {
 149         char linkname[IFNAMSIZ+7];
 150         int ret = 0;
 151
 152         /* first, create a link from the slave back to the master */
 153         ret = sysfs_create_link(&(slave->dev.kobj), &(master->dev.kobj),
 154                                 "master");
 155         if (ret)
 156                 return ret;
 157         /* next, create a link from the master to the slave */
 158         sprintf(linkname, "slave_%s", slave->name);
 159         ret = sysfs_create_link(&(master->dev.kobj), &(slave->dev.kobj),
 160                                 linkname);
 161         return ret;
 162
 163 }
 164
 165 void bond_destroy_slave_symlinks(struct net_device *master,
 166                                  struct net_device *slave)
 167 {
 168         char linkname[IFNAMSIZ+7];
 169
 170         sysfs_remove_link(&(slave->dev.kobj), "master");
 171         sprintf(linkname, "slave_%s", slave->name);
 172         sysfs_remove_link(&(master->dev.kobj), linkname);
 173 }
 174
 175
 176 /*
 177  * Show the slaves in the current bond.
 178  */
 179 static ssize_t bonding_show_slaves(struct device *d,
 180                                    struct device_attribute *attr, char *buf)
 181 {
 182         struct slave *slave;
 183         int i, res = 0;
 184         struct bonding *bond = to_bond(d);
 185
 186         read_lock(&bond->lock);
 187         bond_for_each_slave(bond, slave, i) {
 188                 if (res > (PAGE_SIZE - IFNAMSIZ)) {
 189                         /* not enough space for another interface name */
 190                         if ((PAGE_SIZE - res) > 10)
 191                                 res = PAGE_SIZE - 10;
 192                         res += sprintf(buf + res, "++more++ ");
 193                         break;
 194                 }
 195                 res += sprintf(buf + res, "%s ", slave->dev->name);
 196         }
 197         read_unlock(&bond->lock);
 198         if (res)
 199                 buf[res-1] = '\n'; /* eat the leftover space */
 200         return res;
 201 }
 202
 203 /*
 204  * Set the slaves in the current bond.  The bond interface must be
 205  * up for this to succeed.
 206  * This function is largely the same flow as bonding_update_bonds().
 207  */
 208 static ssize_t bonding_store_slaves(struct device *d,
 209                                     struct device_attribute *attr,
 210                                     const char *buffer, size_t count)
 211 {
 212         char command[IFNAMSIZ + 1] = { 0, };
 213         char *ifname;
 214         int i, res, found, ret = count;
 215         u32 original_mtu;
 216         struct slave *slave;
 217         struct net_device *dev = NULL;
 218         struct bonding *bond = to_bond(d);
 219
 220         /* Quick sanity check -- is the bond interface up? */
 221         if (!(bond->dev->flags & IFF_UP)) {
 222                 pr_warning(DRV_NAME ": %s: doing slave updates when "
 223                            "interface is down.\n", bond->dev->name);
 224         }
 225
 226         /* Note:  We can't hold bond->lock here, as bond_create grabs it. */
 227
 228         if (!rtnl_trylock())
 229                 return restart_syscall();
 230
 231         sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
 232         ifname = command + 1;
 233         if ((strlen(command) <= 1) ||
 234             !dev_valid_name(ifname))
 235                 goto err_no_cmd;
 236
 237         if (command[0] == '+') {
 238
 239                 /* Got a slave name in ifname.  Is it already in the list? */
 240                 found = 0;
 241
 242                 /* FIXME: get netns from sysfs object */
 243                 dev = __dev_get_by_name(&init_net, ifname);
 244                 if (!dev) {
 245                         pr_info(DRV_NAME
 246                                ": %s: Interface %s does not exist!\n",
 247                                bond->dev->name, ifname);
 248                         ret = -ENODEV;
 249                         goto out;
 250                 }
 251
 252                 if (dev->flags & IFF_UP) {
 253                         pr_err(DRV_NAME
 254                                ": %s: Error: Unable to enslave %s "
 255                                "because it is already up.\n",
 256                                bond->dev->name, dev->name);
 257                         ret = -EPERM;
 258                         goto out;
 259                 }
 260
 261                 read_lock(&bond->lock);
 262                 bond_for_each_slave(bond, slave, i)
 263                         if (slave->dev == dev) {
 264                                 pr_err(DRV_NAME
 265                                        ": %s: Interface %s is already enslaved!\n",
 266                                        bond->dev->name, ifname);
 267                                 ret = -EPERM;
 268                                 read_unlock(&bond->lock);
 269                                 goto out;
 270                         }
 271                 read_unlock(&bond->lock);
 272
 273                 pr_info(DRV_NAME ": %s: Adding slave %s.\n",
 274                         bond->dev->name, ifname);
 275
 276                 /* If this is the first slave, then we need to set
 277                    the master's hardware address to be the same as the
 278                    slave's. */
 279                 if (is_zero_ether_addr(bond->dev->dev_addr))
 280                         memcpy(bond->dev->dev_addr, dev->dev_addr,
 281                                dev->addr_len);
 282
 283                 /* Set the slave's MTU to match the bond */
 284                 original_mtu = dev->mtu;
 285                 res = dev_set_mtu(dev, bond->dev->mtu);
 286                 if (res) {
 287                         ret = res;
 288                         goto out;
 289                 }
 290
 291                 res = bond_enslave(bond->dev, dev);
 292                 bond_for_each_slave(bond, slave, i)
 293                         if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0)
 294                                 slave->original_mtu = original_mtu;
 295                 if (res)
 296                         ret = res;
 297
 298                 goto out;
 299         }
 300
 301         if (command[0] == '-') {
 302                 dev = NULL;
 303                 original_mtu = 0;
 304                 bond_for_each_slave(bond, slave, i)
 305                         if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0) {
 306                                 dev = slave->dev;
 307                                 original_mtu = slave->original_mtu;
 308                                 break;
 309                         }
 310                 if (dev) {
 311                         pr_info(DRV_NAME ": %s: Removing slave %s\n",
 312                                 bond->dev->name, dev->name);
 313                                 res = bond_release(bond->dev, dev);
 314                         if (res) {
 315                                 ret = res;
 316                                 goto out;
 317                         }
 318                         /* set the slave MTU to the default */
 319                         dev_set_mtu(dev, original_mtu);
 320                 } else {
 321                         pr_err(DRV_NAME ": unable to remove non-existent"
 322                                " slave %s for bond %s.\n",
 323                                 ifname, bond->dev->name);
 324                         ret = -ENODEV;
 325                 }
 326                 goto out;
 327         }
 328
 329 err_no_cmd:
 330         pr_err(DRV_NAME ": no command found in slaves file for bond %s. Use +ifname or -ifname.\n", bond->dev->name);
 331         ret = -EPERM;
 332
 333 out:
 334         rtnl_unlock();
 335         return ret;
 336 }
 337
 338 static DEVICE_ATTR(slaves, S_IRUGO | S_IWUSR, bonding_show_slaves,
 339                    bonding_store_slaves);
 340
 341 /*
 342  * Show and set the bonding mode.  The bond interface must be down to
 343  * change the mode.
 344  */
 345 static ssize_t bonding_show_mode(struct device *d,
 346                                  struct device_attribute *attr, char *buf)
 347 {
 348         struct bonding *bond = to_bond(d);
 349
 350         return sprintf(buf, "%s %d\n",
 351                         bond_mode_tbl[bond->params.mode].modename,
 352                         bond->params.mode);
 353 }
 354
 355 static ssize_t bonding_store_mode(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(DRV_NAME ": unable to update mode of %s"
 364                        " because interface is up.\n", bond->dev->name);
 365                 ret = -EPERM;
 366                 goto out;
 367         }
 368
 369         new_value = bond_parse_parm(buf, bond_mode_tbl);
 370         if (new_value < 0)  {
 371                 pr_err(DRV_NAME
 372                        ": %s: Ignoring invalid mode value %.*s.\n",
 373                        bond->dev->name,
 374                        (int)strlen(buf) - 1, buf);
 375                 ret = -EINVAL;
 376                 goto out;
 377         } else {
 378                 if (bond->params.mode == BOND_MODE_8023AD)
 379                         bond_unset_master_3ad_flags(bond);
 380
 381                 if (bond->params.mode == BOND_MODE_ALB)
 382                         bond_unset_master_alb_flags(bond);
 383
 384                 bond->params.mode = new_value;
 385                 bond_set_mode_ops(bond, bond->params.mode);
 386                 pr_info(DRV_NAME ": %s: setting mode to %s (%d).\n",
 387                        bond->dev->name, bond_mode_tbl[new_value].modename,
 388                        new_value);
 389         }
 390 out:
 391         return ret;
 392 }
 393 static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
 394                    bonding_show_mode, bonding_store_mode);
 395
 396 /*
 397  * Show and set the bonding transmit hash method.
 398  * The bond interface must be down to change the xmit hash policy.
 399  */
 400 static ssize_t bonding_show_xmit_hash(struct device *d,
 401                                       struct device_attribute *attr,
 402                                       char *buf)
 403 {
 404         struct bonding *bond = to_bond(d);
 405
 406         return sprintf(buf, "%s %d\n",
 407                        xmit_hashtype_tbl[bond->params.xmit_policy].modename,
 408                        bond->params.xmit_policy);
 409 }
 410
 411 static ssize_t bonding_store_xmit_hash(struct device *d,
 412                                        struct device_attribute *attr,
 413                                        const char *buf, size_t count)
 414 {
 415         int new_value, ret = count;
 416         struct bonding *bond = to_bond(d);
 417
 418         if (bond->dev->flags & IFF_UP) {
 419                 pr_err(DRV_NAME
 420                        "%s: Interface is up. Unable to update xmit policy.\n",
 421                        bond->dev->name);
 422                 ret = -EPERM;
 423                 goto out;
 424         }
 425
 426         new_value = bond_parse_parm(buf, xmit_hashtype_tbl);
 427         if (new_value < 0)  {
 428                 pr_err(DRV_NAME
 429                        ": %s: Ignoring invalid xmit hash policy value %.*s.\n",
 430                        bond->dev->name,
 431                        (int)strlen(buf) - 1, buf);
 432                 ret = -EINVAL;
 433                 goto out;
 434         } else {
 435                 bond->params.xmit_policy = new_value;
 436                 bond_set_mode_ops(bond, bond->params.mode);
 437                 pr_info(DRV_NAME ": %s: setting xmit hash policy to %s (%d).\n",
 438                         bond->dev->name,
 439                         xmit_hashtype_tbl[new_value].modename, new_value);
 440         }
 441 out:
 442         return ret;
 443 }
 444 static DEVICE_ATTR(xmit_hash_policy, S_IRUGO | S_IWUSR,
 445                    bonding_show_xmit_hash, bonding_store_xmit_hash);
 446
 447 /*
 448  * Show and set arp_validate.
 449  */
 450 static ssize_t bonding_show_arp_validate(struct device *d,
 451                                          struct device_attribute *attr,
 452                                          char *buf)
 453 {
 454         struct bonding *bond = to_bond(d);
 455
 456         return sprintf(buf, "%s %d\n",
 457                        arp_validate_tbl[bond->params.arp_validate].modename,
 458                        bond->params.arp_validate);
 459 }
 460
 461 static ssize_t bonding_store_arp_validate(struct device *d,
 462                                           struct device_attribute *attr,
 463                                           const char *buf, size_t count)
 464 {
 465         int new_value;
 466         struct bonding *bond = to_bond(d);
 467
 468         new_value = bond_parse_parm(buf, arp_validate_tbl);
 469         if (new_value < 0) {
 470                 pr_err(DRV_NAME
 471                        ": %s: Ignoring invalid arp_validate value %s\n",
 472                        bond->dev->name, buf);
 473                 return -EINVAL;
 474         }
 475         if (new_value && (bond->params.mode != BOND_MODE_ACTIVEBACKUP)) {
 476                 pr_err(DRV_NAME
 477                        ": %s: arp_validate only supported in active-backup mode.\n",
 478                        bond->dev->name);
 479                 return -EINVAL;
 480         }
 481         pr_info(DRV_NAME ": %s: setting arp_validate to %s (%d).\n",
 482                bond->dev->name, arp_validate_tbl[new_value].modename,
 483                new_value);
 484
 485         if (!bond->params.arp_validate && new_value)
 486                 bond_register_arp(bond);
 487         else if (bond->params.arp_validate && !new_value)
 488                 bond_unregister_arp(bond);
 489
 490         bond->params.arp_validate = new_value;
 491
 492         return count;
 493 }
 494
 495 static DEVICE_ATTR(arp_validate, S_IRUGO | S_IWUSR, bonding_show_arp_validate,
 496                    bonding_store_arp_validate);
 497
 498 /*
 499  * Show and store fail_over_mac.  User only allowed to change the
 500  * value when there are no slaves.
 501  */
 502 static ssize_t bonding_show_fail_over_mac(struct device *d,
 503                                           struct device_attribute *attr,
 504                                           char *buf)
 505 {
 506         struct bonding *bond = to_bond(d);
 507
 508         return sprintf(buf, "%s %d\n",
 509                        fail_over_mac_tbl[bond->params.fail_over_mac].modename,
 510                        bond->params.fail_over_mac);
 511 }
 512
 513 static ssize_t bonding_store_fail_over_mac(struct device *d,
 514                                            struct device_attribute *attr,
 515                                            const char *buf, size_t count)
 516 {
 517         int new_value;
 518         struct bonding *bond = to_bond(d);
 519
 520         if (bond->slave_cnt != 0) {
 521                 pr_err(DRV_NAME
 522                        ": %s: Can't alter fail_over_mac with slaves in bond.\n",
 523                        bond->dev->name);
 524                 return -EPERM;
 525         }
 526
 527         new_value = bond_parse_parm(buf, fail_over_mac_tbl);
 528         if (new_value < 0) {
 529                 pr_err(DRV_NAME
 530                        ": %s: Ignoring invalid fail_over_mac value %s.\n",
 531                        bond->dev->name, buf);
 532                 return -EINVAL;
 533         }
 534
 535         bond->params.fail_over_mac = new_value;
 536         pr_info(DRV_NAME ": %s: Setting fail_over_mac to %s (%d).\n",
 537                bond->dev->name, fail_over_mac_tbl[new_value].modename,
 538                new_value);
 539
 540         return count;
 541 }
 542
 543 static DEVICE_ATTR(fail_over_mac, S_IRUGO | S_IWUSR,
 544                    bonding_show_fail_over_mac, bonding_store_fail_over_mac);
 545
 546 /*
 547  * Show and set the arp timer interval.  There are two tricky bits
 548  * here.  First, if ARP monitoring is activated, then we must disable
 549  * MII monitoring.  Second, if the ARP timer isn't running, we must
 550  * start it.
 551  */
 552 static ssize_t bonding_show_arp_interval(struct device *d,
 553                                          struct device_attribute *attr,
 554                                          char *buf)
 555 {
 556         struct bonding *bond = to_bond(d);
 557
 558         return sprintf(buf, "%d\n", bond->params.arp_interval);
 559 }
 560
 561 static ssize_t bonding_store_arp_interval(struct device *d,
 562                                           struct device_attribute *attr,
 563                                           const char *buf, size_t count)
 564 {
 565         int new_value, ret = count;
 566         struct bonding *bond = to_bond(d);
 567
 568         if (sscanf(buf, "%d", &new_value) != 1) {
 569                 pr_err(DRV_NAME
 570                        ": %s: no arp_interval value specified.\n",
 571                        bond->dev->name);
 572                 ret = -EINVAL;
 573                 goto out;
 574         }
 575         if (new_value < 0) {
 576                 pr_err(DRV_NAME
 577                        ": %s: Invalid arp_interval value %d not in range 1-%d; rejected.\n",
 578                        bond->dev->name, new_value, INT_MAX);
 579                 ret = -EINVAL;
 580                 goto out;
 581         }
 582
 583         pr_info(DRV_NAME
 584                ": %s: Setting ARP monitoring interval to %d.\n",
 585                bond->dev->name, new_value);
 586         bond->params.arp_interval = new_value;
 587         if (bond->params.arp_interval)
 588                 bond->dev->priv_flags |= IFF_MASTER_ARPMON;
 589         if (bond->params.miimon) {
 590                 pr_info(DRV_NAME
 591                        ": %s: ARP monitoring cannot be used with MII monitoring. "
 592                        "%s Disabling MII monitoring.\n",
 593                        bond->dev->name, bond->dev->name);
 594                 bond->params.miimon = 0;
 595                 if (delayed_work_pending(&bond->mii_work)) {
 596                         cancel_delayed_work(&bond->mii_work);
 597                         flush_workqueue(bond->wq);
 598                 }
 599         }
 600         if (!bond->params.arp_targets[0]) {
 601                 pr_info(DRV_NAME
 602                        ": %s: ARP monitoring has been set up, "
 603                        "but no ARP targets have been specified.\n",
 604                        bond->dev->name);
 605         }
 606         if (bond->dev->flags & IFF_UP) {
 607                 /* If the interface is up, we may need to fire off
 608                  * the ARP timer.  If the interface is down, the
 609                  * timer will get fired off when the open function
 610                  * is called.
 611                  */
 612                 if (!delayed_work_pending(&bond->arp_work)) {
 613                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
 614                                 INIT_DELAYED_WORK(&bond->arp_work,
 615                                                   bond_activebackup_arp_mon);
 616                         else
 617                                 INIT_DELAYED_WORK(&bond->arp_work,
 618                                                   bond_loadbalance_arp_mon);
 619
 620                         queue_delayed_work(bond->wq, &bond->arp_work, 0);
 621                 }
 622         }
 623
 624 out:
 625         return ret;
 626 }
 627 static DEVICE_ATTR(arp_interval, S_IRUGO | S_IWUSR,
 628                    bonding_show_arp_interval, bonding_store_arp_interval);
 629
 630 /*
 631  * Show and set the arp targets.
 632  */
 633 static ssize_t bonding_show_arp_targets(struct device *d,
 634                                         struct device_attribute *attr,
 635                                         char *buf)
 636 {
 637         int i, res = 0;
 638         struct bonding *bond = to_bond(d);
 639
 640         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) {
 641                 if (bond->params.arp_targets[i])
 642                         res += sprintf(buf + res, "%pI4 ",
 643                                        &bond->params.arp_targets[i]);
 644         }
 645         if (res)
 646                 buf[res-1] = '\n'; /* eat the leftover space */
 647         return res;
 648 }
 649
 650 static ssize_t bonding_store_arp_targets(struct device *d,
 651                                          struct device_attribute *attr,
 652                                          const char *buf, size_t count)
 653 {
 654         __be32 newtarget;
 655         int i = 0, done = 0, ret = count;
 656         struct bonding *bond = to_bond(d);
 657         __be32 *targets;
 658
 659         targets = bond->params.arp_targets;
 660         newtarget = in_aton(buf + 1);
 661         /* look for adds */
 662         if (buf[0] == '+') {
 663                 if ((newtarget == 0) || (newtarget == htonl(INADDR_BROADCAST))) {
 664                         pr_err(DRV_NAME
 665                                ": %s: invalid ARP target %pI4 specified for addition\n",
 666                                bond->dev->name, &newtarget);
 667                         ret = -EINVAL;
 668                         goto out;
 669                 }
 670                 /* look for an empty slot to put the target in, and check for dupes */
 671                 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && !done; i++) {
 672                         if (targets[i] == newtarget) { /* duplicate */
 673                                 pr_err(DRV_NAME
 674                                        ": %s: ARP target %pI4 is already present\n",
 675                                        bond->dev->name, &newtarget);
 676                                 ret = -EINVAL;
 677                                 goto out;
 678                         }
 679                         if (targets[i] == 0) {
 680                                 pr_info(DRV_NAME
 681                                        ": %s: adding ARP target %pI4.\n",
 682                                        bond->dev->name, &newtarget);
 683                                 done = 1;
 684                                 targets[i] = newtarget;
 685                         }
 686                 }
 687                 if (!done) {
 688                         pr_err(DRV_NAME
 689                                ": %s: ARP target table is full!\n",
 690                                bond->dev->name);
 691                         ret = -EINVAL;
 692                         goto out;
 693                 }
 694
 695         } else if (buf[0] == '-')       {
 696                 if ((newtarget == 0) || (newtarget == htonl(INADDR_BROADCAST))) {
 697                         pr_err(DRV_NAME
 698                                ": %s: invalid ARP target %pI4 specified for removal\n",
 699                                bond->dev->name, &newtarget);
 700                         ret = -EINVAL;
 701                         goto out;
 702                 }
 703
 704                 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && !done; i++) {
 705                         if (targets[i] == newtarget) {
 706                                 int j;
 707                                 pr_info(DRV_NAME
 708                                        ": %s: removing ARP target %pI4.\n",
 709                                        bond->dev->name, &newtarget);
 710                                 for (j = i; (j < (BOND_MAX_ARP_TARGETS-1)) && targets[j+1]; j++)
 711                                         targets[j] = targets[j+1];
 712
 713                                 targets[j] = 0;
 714                                 done = 1;
 715                         }
 716                 }
 717                 if (!done) {
 718                         pr_info(DRV_NAME
 719                                ": %s: unable to remove nonexistent ARP target %pI4.\n",
 720                                bond->dev->name, &newtarget);
 721                         ret = -EINVAL;
 722                         goto out;
 723                 }
 724         } else {
 725                 pr_err(DRV_NAME ": no command found in arp_ip_targets file"
 726                        " for bond %s. Use +<addr> or -<addr>.\n",
 727                         bond->dev->name);
 728                 ret = -EPERM;
 729                 goto out;
 730         }
 731
 732 out:
 733         return ret;
 734 }
 735 static DEVICE_ATTR(arp_ip_target, S_IRUGO | S_IWUSR , bonding_show_arp_targets, bonding_store_arp_targets);
 736
 737 /*
 738  * Show and set the up and down delays.  These must be multiples of the
 739  * MII monitoring value, and are stored internally as the multiplier.
 740  * Thus, we must translate to MS for the real world.
 741  */
 742 static ssize_t bonding_show_downdelay(struct device *d,
 743                                       struct device_attribute *attr,
 744                                       char *buf)
 745 {
 746         struct bonding *bond = to_bond(d);
 747
 748         return sprintf(buf, "%d\n", bond->params.downdelay * bond->params.miimon);
 749 }
 750
 751 static ssize_t bonding_store_downdelay(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 (!(bond->params.miimon)) {
 759                 pr_err(DRV_NAME
 760                        ": %s: Unable to set down delay as MII monitoring is disabled\n",
 761                        bond->dev->name);
 762                 ret = -EPERM;
 763                 goto out;
 764         }
 765
 766         if (sscanf(buf, "%d", &new_value) != 1) {
 767                 pr_err(DRV_NAME
 768                        ": %s: no down delay value specified.\n",
 769                        bond->dev->name);
 770                 ret = -EINVAL;
 771                 goto out;
 772         }
 773         if (new_value < 0) {
 774                 pr_err(DRV_NAME
 775                        ": %s: Invalid down delay value %d not in range %d-%d; rejected.\n",
 776                        bond->dev->name, new_value, 1, INT_MAX);
 777                 ret = -EINVAL;
 778                 goto out;
 779         } else {
 780                 if ((new_value % bond->params.miimon) != 0) {
 781                         pr_warning(DRV_NAME
 782                                    ": %s: Warning: down delay (%d) is not a "
 783                                    "multiple of miimon (%d), delay rounded "
 784                                    "to %d ms\n",
 785                                    bond->dev->name, new_value,
 786                                    bond->params.miimon,
 787                                    (new_value / bond->params.miimon) *
 788                                    bond->params.miimon);
 789                 }
 790                 bond->params.downdelay = new_value / bond->params.miimon;
 791                 pr_info(DRV_NAME ": %s: Setting down delay to %d.\n",
 792                        bond->dev->name,
 793                        bond->params.downdelay * bond->params.miimon);
 794
 795         }
 796
 797 out:
 798         return ret;
 799 }
 800 static DEVICE_ATTR(downdelay, S_IRUGO | S_IWUSR,
 801                    bonding_show_downdelay, bonding_store_downdelay);
 802
 803 static ssize_t bonding_show_updelay(struct device *d,
 804                                     struct device_attribute *attr,
 805                                     char *buf)
 806 {
 807         struct bonding *bond = to_bond(d);
 808
 809         return sprintf(buf, "%d\n", bond->params.updelay * bond->params.miimon);
 810
 811 }
 812
 813 static ssize_t bonding_store_updelay(struct device *d,
 814                                      struct device_attribute *attr,
 815                                      const char *buf, size_t count)
 816 {
 817         int new_value, ret = count;
 818         struct bonding *bond = to_bond(d);
 819
 820         if (!(bond->params.miimon)) {
 821                 pr_err(DRV_NAME
 822                        ": %s: Unable to set up delay as MII monitoring is disabled\n",
 823                        bond->dev->name);
 824                 ret = -EPERM;
 825                 goto out;
 826         }
 827
 828         if (sscanf(buf, "%d", &new_value) != 1) {
 829                 pr_err(DRV_NAME
 830                        ": %s: no up delay value specified.\n",
 831                        bond->dev->name);
 832                 ret = -EINVAL;
 833                 goto out;
 834         }
 835         if (new_value < 0) {
 836                 pr_err(DRV_NAME
 837                        ": %s: Invalid down delay value %d not in range %d-%d; rejected.\n",
 838                        bond->dev->name, new_value, 1, INT_MAX);
 839                 ret = -EINVAL;
 840                 goto out;
 841         } else {
 842                 if ((new_value % bond->params.miimon) != 0) {
 843                         pr_warning(DRV_NAME
 844                                    ": %s: Warning: up delay (%d) is not a "
 845                                    "multiple of miimon (%d), updelay rounded "
 846                                    "to %d ms\n",
 847                                    bond->dev->name, new_value,
 848                                    bond->params.miimon,
 849                                    (new_value / bond->params.miimon) *
 850                                    bond->params.miimon);
 851                 }
 852                 bond->params.updelay = new_value / bond->params.miimon;
 853                 pr_info(DRV_NAME ": %s: Setting up delay to %d.\n",
 854                        bond->dev->name, bond->params.updelay * bond->params.miimon);
 855
 856         }
 857
 858 out:
 859         return ret;
 860 }
 861 static DEVICE_ATTR(updelay, S_IRUGO | S_IWUSR,
 862                    bonding_show_updelay, bonding_store_updelay);
 863
 864 /*
 865  * Show and set the LACP interval.  Interface must be down, and the mode
 866  * must be set to 802.3ad mode.
 867  */
 868 static ssize_t bonding_show_lacp(struct device *d,
 869                                  struct device_attribute *attr,
 870                                  char *buf)
 871 {
 872         struct bonding *bond = to_bond(d);
 873
 874         return sprintf(buf, "%s %d\n",
 875                 bond_lacp_tbl[bond->params.lacp_fast].modename,
 876                 bond->params.lacp_fast);
 877 }
 878
 879 static ssize_t bonding_store_lacp(struct device *d,
 880                                   struct device_attribute *attr,
 881                                   const char *buf, size_t count)
 882 {
 883         int new_value, ret = count;
 884         struct bonding *bond = to_bond(d);
 885
 886         if (bond->dev->flags & IFF_UP) {
 887                 pr_err(DRV_NAME
 888                        ": %s: Unable to update LACP rate because interface is up.\n",
 889                        bond->dev->name);
 890                 ret = -EPERM;
 891                 goto out;
 892         }
 893
 894         if (bond->params.mode != BOND_MODE_8023AD) {
 895                 pr_err(DRV_NAME
 896                        ": %s: Unable to update LACP rate because bond is not in 802.3ad mode.\n",
 897                        bond->dev->name);
 898                 ret = -EPERM;
 899                 goto out;
 900         }
 901
 902         new_value = bond_parse_parm(buf, bond_lacp_tbl);
 903
 904         if ((new_value == 1) || (new_value == 0)) {
 905                 bond->params.lacp_fast = new_value;
 906                 pr_info(DRV_NAME ": %s: Setting LACP rate to %s (%d).\n",
 907                         bond->dev->name, bond_lacp_tbl[new_value].modename,
 908                         new_value);
 909         } else {
 910                 pr_err(DRV_NAME
 911                        ": %s: Ignoring invalid LACP rate value %.*s.\n",
 912                        bond->dev->name, (int)strlen(buf) - 1, buf);
 913                 ret = -EINVAL;
 914         }
 915 out:
 916         return ret;
 917 }
 918 static DEVICE_ATTR(lacp_rate, S_IRUGO | S_IWUSR,
 919                    bonding_show_lacp, bonding_store_lacp);
 920
 921 static ssize_t bonding_show_ad_select(struct device *d,
 922                                       struct device_attribute *attr,
 923                                       char *buf)
 924 {
 925         struct bonding *bond = to_bond(d);
 926
 927         return sprintf(buf, "%s %d\n",
 928                 ad_select_tbl[bond->params.ad_select].modename,
 929                 bond->params.ad_select);
 930 }
 931
 932
 933 static ssize_t bonding_store_ad_select(struct device *d,
 934                                        struct device_attribute *attr,
 935                                        const char *buf, size_t count)
 936 {
 937         int new_value, ret = count;
 938         struct bonding *bond = to_bond(d);
 939
 940         if (bond->dev->flags & IFF_UP) {
 941                 pr_err(DRV_NAME
 942                        ": %s: Unable to update ad_select because interface "
 943                        "is up.\n", bond->dev->name);
 944                 ret = -EPERM;
 945                 goto out;
 946         }
 947
 948         new_value = bond_parse_parm(buf, ad_select_tbl);
 949
 950         if (new_value != -1) {
 951                 bond->params.ad_select = new_value;
 952                 pr_info(DRV_NAME
 953                        ": %s: Setting ad_select to %s (%d).\n",
 954                        bond->dev->name, ad_select_tbl[new_value].modename,
 955                        new_value);
 956         } else {
 957                 pr_err(DRV_NAME
 958                        ": %s: Ignoring invalid ad_select value %.*s.\n",
 959                        bond->dev->name, (int)strlen(buf) - 1, buf);
 960                 ret = -EINVAL;
 961         }
 962 out:
 963         return ret;
 964 }
 965 static DEVICE_ATTR(ad_select, S_IRUGO | S_IWUSR,
 966                    bonding_show_ad_select, bonding_store_ad_select);
 967
 968 /*
 969  * Show and set the number of grat ARP to send after a failover event.
 970  */
 971 static ssize_t bonding_show_n_grat_arp(struct device *d,
 972                                    struct device_attribute *attr,
 973                                    char *buf)
 974 {
 975         struct bonding *bond = to_bond(d);
 976
 977         return sprintf(buf, "%d\n", bond->params.num_grat_arp);
 978 }
 979
 980 static ssize_t bonding_store_n_grat_arp(struct device *d,
 981                                     struct device_attribute *attr,
 982                                     const char *buf, size_t count)
 983 {
 984         int new_value, ret = count;
 985         struct bonding *bond = to_bond(d);
 986
 987         if (sscanf(buf, "%d", &new_value) != 1) {
 988                 pr_err(DRV_NAME
 989                        ": %s: no num_grat_arp value specified.\n",
 990                        bond->dev->name);
 991                 ret = -EINVAL;
 992                 goto out;
 993         }
 994         if (new_value < 0 || new_value > 255) {
 995                 pr_err(DRV_NAME
 996                        ": %s: Invalid num_grat_arp value %d not in range 0-255; rejected.\n",
 997                        bond->dev->name, new_value);
 998                 ret = -EINVAL;
 999                 goto out;
1000         } else {
1001                 bond->params.num_grat_arp = new_value;
1002         }
1003 out:
1004         return ret;
1005 }
1006 static DEVICE_ATTR(num_grat_arp, S_IRUGO | S_IWUSR,
1007                    bonding_show_n_grat_arp, bonding_store_n_grat_arp);
1008
1009 /*
1010  * Show and set the number of unsolicited NA's to send after a failover event.
1011  */
1012 static ssize_t bonding_show_n_unsol_na(struct device *d,
1013                                        struct device_attribute *attr,
1014                                        char *buf)
1015 {
1016         struct bonding *bond = to_bond(d);
1017
1018         return sprintf(buf, "%d\n", bond->params.num_unsol_na);
1019 }
1020
1021 static ssize_t bonding_store_n_unsol_na(struct device *d,
1022                                         struct device_attribute *attr,
1023                                         const char *buf, size_t count)
1024 {
1025         int new_value, ret = count;
1026         struct bonding *bond = to_bond(d);
1027
1028         if (sscanf(buf, "%d", &new_value) != 1) {
1029                 pr_err(DRV_NAME
1030                        ": %s: no num_unsol_na value specified.\n",
1031                        bond->dev->name);
1032                 ret = -EINVAL;
1033                 goto out;
1034         }
1035
1036         if (new_value < 0 || new_value > 255) {
1037                 pr_err(DRV_NAME
1038                        ": %s: Invalid num_unsol_na value %d not in range 0-255; rejected.\n",
1039                        bond->dev->name, new_value);
1040                 ret = -EINVAL;
1041                 goto out;
1042         } else
1043                 bond->params.num_unsol_na = new_value;
1044 out:
1045         return ret;
1046 }
1047 static DEVICE_ATTR(num_unsol_na, S_IRUGO | S_IWUSR,
1048                    bonding_show_n_unsol_na, bonding_store_n_unsol_na);
1049
1050 /*
1051  * Show and set the MII monitor interval.  There are two tricky bits
1052  * here.  First, if MII monitoring is activated, then we must disable
1053  * ARP monitoring.  Second, if the timer isn't running, we must
1054  * start it.
1055  */
1056 static ssize_t bonding_show_miimon(struct device *d,
1057                                    struct device_attribute *attr,
1058                                    char *buf)
1059 {
1060         struct bonding *bond = to_bond(d);
1061
1062         return sprintf(buf, "%d\n", bond->params.miimon);
1063 }
1064
1065 static ssize_t bonding_store_miimon(struct device *d,
1066                                     struct device_attribute *attr,
1067                                     const char *buf, size_t count)
1068 {
1069         int new_value, ret = count;
1070         struct bonding *bond = to_bond(d);
1071
1072         if (sscanf(buf, "%d", &new_value) != 1) {
1073                 pr_err(DRV_NAME
1074                        ": %s: no miimon value specified.\n",
1075                        bond->dev->name);
1076                 ret = -EINVAL;
1077                 goto out;
1078         }
1079         if (new_value < 0) {
1080                 pr_err(DRV_NAME
1081                        ": %s: Invalid miimon value %d not in range %d-%d; rejected.\n",
1082                        bond->dev->name, new_value, 1, INT_MAX);
1083                 ret = -EINVAL;
1084                 goto out;
1085         } else {
1086                 pr_info(DRV_NAME
1087                        ": %s: Setting MII monitoring interval to %d.\n",
1088                        bond->dev->name, new_value);
1089                 bond->params.miimon = new_value;
1090                 if (bond->params.updelay)
1091                         pr_info(DRV_NAME
1092                               ": %s: Note: Updating updelay (to %d) "
1093                               "since it is a multiple of the miimon value.\n",
1094                               bond->dev->name,
1095                               bond->params.updelay * bond->params.miimon);
1096                 if (bond->params.downdelay)
1097                         pr_info(DRV_NAME
1098                               ": %s: Note: Updating downdelay (to %d) "
1099                               "since it is a multiple of the miimon value.\n",
1100                               bond->dev->name,
1101                               bond->params.downdelay * bond->params.miimon);
1102                 if (bond->params.arp_interval) {
1103                         pr_info(DRV_NAME
1104                                ": %s: MII monitoring cannot be used with "
1105                                "ARP monitoring. Disabling ARP monitoring...\n",
1106                                bond->dev->name);
1107                         bond->params.arp_interval = 0;
1108                         bond->dev->priv_flags &= ~IFF_MASTER_ARPMON;
1109                         if (bond->params.arp_validate) {
1110                                 bond_unregister_arp(bond);
1111                                 bond->params.arp_validate =
1112                                         BOND_ARP_VALIDATE_NONE;
1113                         }
1114                         if (delayed_work_pending(&bond->arp_work)) {
1115                                 cancel_delayed_work(&bond->arp_work);
1116                                 flush_workqueue(bond->wq);
1117                         }
1118                 }
1119
1120                 if (bond->dev->flags & IFF_UP) {
1121                         /* If the interface is up, we may need to fire off
1122                          * the MII timer. If the interface is down, the
1123                          * timer will get fired off when the open function
1124                          * is called.
1125                          */
1126                         if (!delayed_work_pending(&bond->mii_work)) {
1127                                 INIT_DELAYED_WORK(&bond->mii_work,
1128                                                   bond_mii_monitor);
1129                                 queue_delayed_work(bond->wq,
1130                                                    &bond->mii_work, 0);
1131                         }
1132                 }
1133         }
1134 out:
1135         return ret;
1136 }
1137 static DEVICE_ATTR(miimon, S_IRUGO | S_IWUSR,
1138                    bonding_show_miimon, bonding_store_miimon);
1139
1140 /*
1141  * Show and set the primary slave.  The store function is much
1142  * simpler than bonding_store_slaves function because it only needs to
1143  * handle one interface name.
1144  * The bond must be a mode that supports a primary for this be
1145  * set.
1146  */
1147 static ssize_t bonding_show_primary(struct device *d,
1148                                     struct device_attribute *attr,
1149                                     char *buf)
1150 {
1151         int count = 0;
1152         struct bonding *bond = to_bond(d);
1153
1154         if (bond->primary_slave)
1155                 count = sprintf(buf, "%s\n", bond->primary_slave->dev->name);
1156
1157         return count;
1158 }
1159
1160 static ssize_t bonding_store_primary(struct device *d,
1161                                      struct device_attribute *attr,
1162                                      const char *buf, size_t count)
1163 {
1164         int i;
1165         struct slave *slave;
1166         struct bonding *bond = to_bond(d);
1167
1168         if (!rtnl_trylock())
1169                 return restart_syscall();
1170         read_lock(&bond->lock);
1171         write_lock_bh(&bond->curr_slave_lock);
1172
1173         if (!USES_PRIMARY(bond->params.mode)) {
1174                 pr_info(DRV_NAME
1175                        ": %s: Unable to set primary slave; %s is in mode %d\n",
1176                        bond->dev->name, bond->dev->name, bond->params.mode);
1177         } else {
1178                 bond_for_each_slave(bond, slave, i) {
1179                         if (strnicmp
1180                             (slave->dev->name, buf,
1181                              strlen(slave->dev->name)) == 0) {
1182                                 pr_info(DRV_NAME
1183                                        ": %s: Setting %s as primary slave.\n",
1184                                        bond->dev->name, slave->dev->name);
1185                                 bond->primary_slave = slave;
1186                                 strcpy(bond->params.primary, slave->dev->name);
1187                                 bond_select_active_slave(bond);
1188                                 goto out;
1189                         }
1190                 }
1191
1192                 /* if we got here, then we didn't match the name of any slave */
1193
1194                 if (strlen(buf) == 0 || buf[0] == '\n') {
1195                         pr_info(DRV_NAME
1196                                ": %s: Setting primary slave to None.\n",
1197                                bond->dev->name);
1198                         bond->primary_slave = NULL;
1199                                 bond_select_active_slave(bond);
1200                 } else {
1201                         pr_info(DRV_NAME
1202                                ": %s: Unable to set %.*s as primary slave as it is not a slave.\n",
1203                                bond->dev->name, (int)strlen(buf) - 1, buf);
1204                 }
1205         }
1206 out:
1207         write_unlock_bh(&bond->curr_slave_lock);
1208         read_unlock(&bond->lock);
1209         rtnl_unlock();
1210
1211         return count;
1212 }
1213 static DEVICE_ATTR(primary, S_IRUGO | S_IWUSR,
1214                    bonding_show_primary, bonding_store_primary);
1215
1216 /*
1217  * Show and set the use_carrier flag.
1218  */
1219 static ssize_t bonding_show_carrier(struct device *d,
1220                                     struct device_attribute *attr,
1221                                     char *buf)
1222 {
1223         struct bonding *bond = to_bond(d);
1224
1225         return sprintf(buf, "%d\n", bond->params.use_carrier);
1226 }
1227
1228 static ssize_t bonding_store_carrier(struct device *d,
1229                                      struct device_attribute *attr,
1230                                      const char *buf, size_t count)
1231 {
1232         int new_value, ret = count;
1233         struct bonding *bond = to_bond(d);
1234
1235
1236         if (sscanf(buf, "%d", &new_value) != 1) {
1237                 pr_err(DRV_NAME
1238                        ": %s: no use_carrier value specified.\n",
1239                        bond->dev->name);
1240                 ret = -EINVAL;
1241                 goto out;
1242         }
1243         if ((new_value == 0) || (new_value == 1)) {
1244                 bond->params.use_carrier = new_value;
1245                 pr_info(DRV_NAME ": %s: Setting use_carrier to %d.\n",
1246                        bond->dev->name, new_value);
1247         } else {
1248                 pr_info(DRV_NAME
1249                        ": %s: Ignoring invalid use_carrier value %d.\n",
1250                        bond->dev->name, new_value);
1251         }
1252 out:
1253         return count;
1254 }
1255 static DEVICE_ATTR(use_carrier, S_IRUGO | S_IWUSR,
1256                    bonding_show_carrier, bonding_store_carrier);
1257
1258
1259 /*
1260  * Show and set currently active_slave.
1261  */
1262 static ssize_t bonding_show_active_slave(struct device *d,
1263                                          struct device_attribute *attr,
1264                                          char *buf)
1265 {
1266         struct slave *curr;
1267         struct bonding *bond = to_bond(d);
1268         int count = 0;
1269
1270         read_lock(&bond->curr_slave_lock);
1271         curr = bond->curr_active_slave;
1272         read_unlock(&bond->curr_slave_lock);
1273
1274         if (USES_PRIMARY(bond->params.mode) && curr)
1275                 count = sprintf(buf, "%s\n", curr->dev->name);
1276         return count;
1277 }
1278
1279 static ssize_t bonding_store_active_slave(struct device *d,
1280                                           struct device_attribute *attr,
1281                                           const char *buf, size_t count)
1282 {
1283         int i;
1284         struct slave *slave;
1285         struct slave *old_active = NULL;
1286         struct slave *new_active = NULL;
1287         struct bonding *bond = to_bond(d);
1288
1289         if (!rtnl_trylock())
1290                 return restart_syscall();
1291         read_lock(&bond->lock);
1292         write_lock_bh(&bond->curr_slave_lock);
1293
1294         if (!USES_PRIMARY(bond->params.mode))
1295                 pr_info(DRV_NAME ": %s: Unable to change active slave;"
1296                         " %s is in mode %d\n",
1297                         bond->dev->name, bond->dev->name, bond->params.mode);
1298         else {
1299                 bond_for_each_slave(bond, slave, i) {
1300                         if (strnicmp
1301                             (slave->dev->name, buf,
1302                              strlen(slave->dev->name)) == 0) {
1303                                 old_active = bond->curr_active_slave;
1304                                 new_active = slave;
1305                                 if (new_active == old_active) {
1306                                         /* do nothing */
1307                                         pr_info(DRV_NAME
1308                                                 ": %s: %s is already the current active slave.\n",
1309                                                 bond->dev->name, slave->dev->name);
1310                                         goto out;
1311                                 }
1312                                 else {
1313                                         if ((new_active) &&
1314                                             (old_active) &&
1315                                             (new_active->link == BOND_LINK_UP) &&
1316                                             IS_UP(new_active->dev)) {
1317                                                 pr_info(DRV_NAME
1318                                                         ": %s: Setting %s as active slave.\n",
1319                                                         bond->dev->name, slave->dev->name);
1320                                                         bond_change_active_slave(bond, new_active);
1321                                         }
1322                                         else {
1323                                                 pr_info(DRV_NAME
1324                                                         ": %s: Could not set %s as active slave; "
1325                                                         "either %s is down or the link is down.\n",
1326                                                         bond->dev->name, slave->dev->name,
1327                                                         slave->dev->name);
1328                                         }
1329                                         goto out;
1330                                 }
1331                         }
1332                 }
1333
1334                 /* if we got here, then we didn't match the name of any slave */
1335
1336                 if (strlen(buf) == 0 || buf[0] == '\n') {
1337                         pr_info(DRV_NAME
1338                                 ": %s: Setting active slave to None.\n",
1339                                 bond->dev->name);
1340                         bond->primary_slave = NULL;
1341                         bond_select_active_slave(bond);
1342                 } else {
1343                         pr_info(DRV_NAME ": %s: Unable to set %.*s"
1344                                 " as active slave as it is not a slave.\n",
1345                                 bond->dev->name, (int)strlen(buf) - 1, buf);
1346                 }
1347         }
1348  out:
1349         write_unlock_bh(&bond->curr_slave_lock);
1350         read_unlock(&bond->lock);
1351         rtnl_unlock();
1352
1353         return count;
1354
1355 }
1356 static DEVICE_ATTR(active_slave, S_IRUGO | S_IWUSR,
1357                    bonding_show_active_slave, bonding_store_active_slave);
1358
1359
1360 /*
1361  * Show link status of the bond interface.
1362  */
1363 static ssize_t bonding_show_mii_status(struct device *d,
1364                                        struct device_attribute *attr,
1365                                        char *buf)
1366 {
1367         struct slave *curr;
1368         struct bonding *bond = to_bond(d);
1369
1370         read_lock(&bond->curr_slave_lock);
1371         curr = bond->curr_active_slave;
1372         read_unlock(&bond->curr_slave_lock);
1373
1374         return sprintf(buf, "%s\n", curr ? "up" : "down");
1375 }
1376 static DEVICE_ATTR(mii_status, S_IRUGO, bonding_show_mii_status, NULL);
1377
1378
1379 /*
1380  * Show current 802.3ad aggregator ID.
1381  */
1382 static ssize_t bonding_show_ad_aggregator(struct device *d,
1383                                           struct device_attribute *attr,
1384                                           char *buf)
1385 {
1386         int count = 0;
1387         struct bonding *bond = to_bond(d);
1388
1389         if (bond->params.mode == BOND_MODE_8023AD) {
1390                 struct ad_info ad_info;
1391                 count = sprintf(buf, "%d\n",
1392                                 (bond_3ad_get_active_agg_info(bond, &ad_info))
1393                                 ?  0 : ad_info.aggregator_id);
1394         }
1395
1396         return count;
1397 }
1398 static DEVICE_ATTR(ad_aggregator, S_IRUGO, bonding_show_ad_aggregator, NULL);
1399
1400
1401 /*
1402  * Show number of active 802.3ad ports.
1403  */
1404 static ssize_t bonding_show_ad_num_ports(struct device *d,
1405                                          struct device_attribute *attr,
1406                                          char *buf)
1407 {
1408         int count = 0;
1409         struct bonding *bond = to_bond(d);
1410
1411         if (bond->params.mode == BOND_MODE_8023AD) {
1412                 struct ad_info ad_info;
1413                 count = sprintf(buf, "%d\n",
1414                                 (bond_3ad_get_active_agg_info(bond, &ad_info))
1415                                 ?  0 : ad_info.ports);
1416         }
1417
1418         return count;
1419 }
1420 static DEVICE_ATTR(ad_num_ports, S_IRUGO, bonding_show_ad_num_ports, NULL);
1421
1422
1423 /*
1424  * Show current 802.3ad actor key.
1425  */
1426 static ssize_t bonding_show_ad_actor_key(struct device *d,
1427                                          struct device_attribute *attr,
1428                                          char *buf)
1429 {
1430         int count = 0;
1431         struct bonding *bond = to_bond(d);
1432
1433         if (bond->params.mode == BOND_MODE_8023AD) {
1434                 struct ad_info ad_info;
1435                 count = sprintf(buf, "%d\n",
1436                                 (bond_3ad_get_active_agg_info(bond, &ad_info))
1437                                 ?  0 : ad_info.actor_key);
1438         }
1439
1440         return count;
1441 }
1442 static DEVICE_ATTR(ad_actor_key, S_IRUGO, bonding_show_ad_actor_key, NULL);
1443
1444
1445 /*
1446  * Show current 802.3ad partner key.
1447  */
1448 static ssize_t bonding_show_ad_partner_key(struct device *d,
1449                                            struct device_attribute *attr,
1450                                            char *buf)
1451 {
1452         int count = 0;
1453         struct bonding *bond = to_bond(d);
1454
1455         if (bond->params.mode == BOND_MODE_8023AD) {
1456                 struct ad_info ad_info;
1457                 count = sprintf(buf, "%d\n",
1458                                 (bond_3ad_get_active_agg_info(bond, &ad_info))
1459                                 ?  0 : ad_info.partner_key);
1460         }
1461
1462         return count;
1463 }
1464 static DEVICE_ATTR(ad_partner_key, S_IRUGO, bonding_show_ad_partner_key, NULL);
1465
1466
1467 /*
1468  * Show current 802.3ad partner mac.
1469  */
1470 static ssize_t bonding_show_ad_partner_mac(struct device *d,
1471                                            struct device_attribute *attr,
1472                                            char *buf)
1473 {
1474         int count = 0;
1475         struct bonding *bond = to_bond(d);
1476
1477         if (bond->params.mode == BOND_MODE_8023AD) {
1478                 struct ad_info ad_info;
1479                 if (!bond_3ad_get_active_agg_info(bond, &ad_info))
1480                         count = sprintf(buf, "%pM\n", ad_info.partner_system);
1481         }
1482
1483         return count;
1484 }
1485 static DEVICE_ATTR(ad_partner_mac, S_IRUGO, bonding_show_ad_partner_mac, NULL);
1486
1487
1488
1489 static struct attribute *per_bond_attrs[] = {
1490         &dev_attr_slaves.attr,
1491         &dev_attr_mode.attr,
1492         &dev_attr_fail_over_mac.attr,
1493         &dev_attr_arp_validate.attr,
1494         &dev_attr_arp_interval.attr,
1495         &dev_attr_arp_ip_target.attr,
1496         &dev_attr_downdelay.attr,
1497         &dev_attr_updelay.attr,
1498         &dev_attr_lacp_rate.attr,
1499         &dev_attr_ad_select.attr,
1500         &dev_attr_xmit_hash_policy.attr,
1501         &dev_attr_num_grat_arp.attr,
1502         &dev_attr_num_unsol_na.attr,
1503         &dev_attr_miimon.attr,
1504         &dev_attr_primary.attr,
1505         &dev_attr_use_carrier.attr,
1506         &dev_attr_active_slave.attr,
1507         &dev_attr_mii_status.attr,
1508         &dev_attr_ad_aggregator.attr,
1509         &dev_attr_ad_num_ports.attr,
1510         &dev_attr_ad_actor_key.attr,
1511         &dev_attr_ad_partner_key.attr,
1512         &dev_attr_ad_partner_mac.attr,
1513         NULL,
1514 };
1515
1516 static struct attribute_group bonding_group = {
1517         .name = "bonding",
1518         .attrs = per_bond_attrs,
1519 };
1520
1521 /*
1522  * Initialize sysfs.  This sets up the bonding_masters file in
1523  * /sys/class/net.
1524  */
1525 int bond_create_sysfs(void)
1526 {
1527         int ret;
1528
1529         ret = netdev_class_create_file(&class_attr_bonding_masters);
1530         /*
1531          * Permit multiple loads of the module by ignoring failures to
1532          * create the bonding_masters sysfs file.  Bonding devices
1533          * created by second or subsequent loads of the module will
1534          * not be listed in, or controllable by, bonding_masters, but
1535          * will have the usual "bonding" sysfs directory.
1536          *
1537          * This is done to preserve backwards compatibility for
1538          * initscripts/sysconfig, which load bonding multiple times to
1539          * configure multiple bonding devices.
1540          */
1541         if (ret == -EEXIST) {
1542                 /* Is someone being kinky and naming a device bonding_master? */
1543                 if (__dev_get_by_name(&init_net,
1544                                       class_attr_bonding_masters.attr.name))
1545                         pr_err("network device named %s already "
1546                                "exists in sysfs",
1547                                class_attr_bonding_masters.attr.name);
1548                 ret = 0;
1549         }
1550
1551         return ret;
1552
1553 }
1554
1555 /*
1556  * Remove /sys/class/net/bonding_masters.
1557  */
1558 void bond_destroy_sysfs(void)
1559 {
1560         netdev_class_remove_file(&class_attr_bonding_masters);
1561 }
1562
1563 /*
1564  * Initialize sysfs for each bond.  This sets up and registers
1565  * the 'bondctl' directory for each individual bond under /sys/class/net.
1566  */
1567 int bond_create_sysfs_entry(struct bonding *bond)
1568 {
1569         struct net_device *dev = bond->dev;
1570         int err;
1571
1572         err = sysfs_create_group(&(dev->dev.kobj), &bonding_group);
1573         if (err)
1574                 pr_emerg("eek! didn't create group!\n");
1575
1576         return err;
1577 }
1578 /*
1579  * Remove sysfs entries for each bond.
1580  */
1581 void bond_destroy_sysfs_entry(struct bonding *bond)
1582 {
1583         struct net_device *dev = bond->dev;
1584
1585         sysfs_remove_group(&(dev->dev.kobj), &bonding_group);
1586 }
1587