drivers/net/bonding/bond_sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright(c) 2004-2005 Intel Corporation. All rights reserved.
   4  */
   5
   6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   7
   8 #include <linux/kernel.h>
   9 #include <linux/module.h>
  10 #include <linux/device.h>
  11 #include <linux/sched/signal.h>
  12 #include <linux/fs.h>
  13 #include <linux/types.h>
  14 #include <linux/string.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/inetdevice.h>
  17 #include <linux/in.h>
  18 #include <linux/sysfs.h>
  19 #include <linux/ctype.h>
  20 #include <linux/inet.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/etherdevice.h>
  23 #include <net/net_namespace.h>
  24 #include <net/netns/generic.h>
  25 #include <linux/nsproxy.h>
  26
  27 #include <net/bonding.h>
  28
  29 #define to_bond(cd)     ((struct bonding *)(netdev_priv(to_net_dev(cd))))
  30
  31 /* "show" function for the bond_masters attribute.
  32  * The class parameter is ignored.
  33  */
  34 static ssize_t bonding_show_bonds(const struct class *cls,
  35                                   const struct class_attribute *attr,
  36                                   char *buf)
  37 {
  38         const struct bond_net *bn =
  39                 container_of_const(attr, struct bond_net, class_attr_bonding_masters);
  40         int res = 0;
  41         struct bonding *bond;
  42
  43         rtnl_lock();
  44
  45         list_for_each_entry(bond, &bn->dev_list, bond_list) {
  46                 if (res > (PAGE_SIZE - IFNAMSIZ)) {
  47                         /* not enough space for another interface name */
  48                         if ((PAGE_SIZE - res) > 10)
  49                                 res = PAGE_SIZE - 10;
  50                         res += sysfs_emit_at(buf, res, "++more++ ");
  51                         break;
  52                 }
  53                 res += sysfs_emit_at(buf, res, "%s ", bond->dev->name);
  54         }
  55         if (res)
  56                 buf[res-1] = '\n'; /* eat the leftover space */
  57
  58         rtnl_unlock();
  59         return res;
  60 }
  61
  62 static struct net_device *bond_get_by_name(const struct bond_net *bn, const char *ifname)
  63 {
  64         struct bonding *bond;
  65
  66         list_for_each_entry(bond, &bn->dev_list, bond_list) {
  67                 if (strncmp(bond->dev->name, ifname, IFNAMSIZ) == 0)
  68                         return bond->dev;
  69         }
  70         return NULL;
  71 }
  72
  73 /* "store" function for the bond_masters attribute.  This is what
  74  * creates and deletes entire bonds.
  75  *
  76  * The class parameter is ignored.
  77  */
  78 static ssize_t bonding_store_bonds(const struct class *cls,
  79                                    const struct class_attribute *attr,
  80                                    const char *buffer, size_t count)
  81 {
  82         const struct bond_net *bn =
  83                 container_of_const(attr, struct bond_net, class_attr_bonding_masters);
  84         char command[IFNAMSIZ + 1] = {0, };
  85         char *ifname;
  86         int rv, res = count;
  87
  88         sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
  89         ifname = command + 1;
  90         if ((strlen(command) <= 1) ||
  91             !dev_valid_name(ifname))
  92                 goto err_no_cmd;
  93
  94         if (command[0] == '+') {
  95                 pr_info("%s is being created...\n", ifname);
  96                 rv = bond_create(bn->net, ifname);
  97                 if (rv) {
  98                         if (rv == -EEXIST)
  99                                 pr_info("%s already exists\n", ifname);
 100                         else
 101                                 pr_info("%s creation failed\n", ifname);
 102                         res = rv;
 103                 }
 104         } else if (command[0] == '-') {
 105                 struct net_device *bond_dev;
 106
 107                 rtnl_lock();
 108                 bond_dev = bond_get_by_name(bn, ifname);
 109                 if (bond_dev) {
 110                         pr_info("%s is being deleted...\n", ifname);
 111                         unregister_netdevice(bond_dev);
 112                 } else {
 113                         pr_err("unable to delete non-existent %s\n", ifname);
 114                         res = -ENODEV;
 115                 }
 116                 rtnl_unlock();
 117         } else
 118                 goto err_no_cmd;
 119
 120         /* Always return either count or an error.  If you return 0, you'll
 121          * get called forever, which is bad.
 122          */
 123         return res;
 124
 125 err_no_cmd:
 126         pr_err("no command found in bonding_masters - use +ifname or -ifname\n");
 127         return -EPERM;
 128 }
 129
 130 /* class attribute for bond_masters file.  This ends up in /sys/class/net */
 131 static const struct class_attribute class_attr_bonding_masters = {
 132         .attr = {
 133                 .name = "bonding_masters",
 134                 .mode = 0644,
 135         },
 136         .show = bonding_show_bonds,
 137         .store = bonding_store_bonds,
 138 };
 139
 140 /* Generic "store" method for bonding sysfs option setting */
 141 static ssize_t bonding_sysfs_store_option(struct device *d,
 142                                           struct device_attribute *attr,
 143                                           const char *buffer, size_t count)
 144 {
 145         struct bonding *bond = to_bond(d);
 146         const struct bond_option *opt;
 147         char *buffer_clone;
 148         int ret;
 149
 150         opt = bond_opt_get_by_name(attr->attr.name);
 151         if (WARN_ON(!opt))
 152                 return -ENOENT;
 153         buffer_clone = kstrndup(buffer, count, GFP_KERNEL);
 154         if (!buffer_clone)
 155                 return -ENOMEM;
 156         ret = bond_opt_tryset_rtnl(bond, opt->id, buffer_clone);
 157         if (!ret)
 158                 ret = count;
 159         kfree(buffer_clone);
 160
 161         return ret;
 162 }
 163
 164 /* Show the slaves in the current bond. */
 165 static ssize_t bonding_show_slaves(struct device *d,
 166                                    struct device_attribute *attr, char *buf)
 167 {
 168         struct bonding *bond = to_bond(d);
 169         struct list_head *iter;
 170         struct slave *slave;
 171         int res = 0;
 172
 173         if (!rtnl_trylock())
 174                 return restart_syscall();
 175
 176         bond_for_each_slave(bond, slave, iter) {
 177                 if (res > (PAGE_SIZE - IFNAMSIZ)) {
 178                         /* not enough space for another interface name */
 179                         if ((PAGE_SIZE - res) > 10)
 180                                 res = PAGE_SIZE - 10;
 181                         res += sysfs_emit_at(buf, res, "++more++ ");
 182                         break;
 183                 }
 184                 res += sysfs_emit_at(buf, res, "%s ", slave->dev->name);
 185         }
 186
 187         rtnl_unlock();
 188
 189         if (res)
 190                 buf[res-1] = '\n'; /* eat the leftover space */
 191
 192         return res;
 193 }
 194 static DEVICE_ATTR(slaves, 0644, bonding_show_slaves,
 195                    bonding_sysfs_store_option);
 196
 197 /* Show the bonding mode. */
 198 static ssize_t bonding_show_mode(struct device *d,
 199                                  struct device_attribute *attr, char *buf)
 200 {
 201         struct bonding *bond = to_bond(d);
 202         const struct bond_opt_value *val;
 203
 204         val = bond_opt_get_val(BOND_OPT_MODE, BOND_MODE(bond));
 205
 206         return sysfs_emit(buf, "%s %d\n", val->string, BOND_MODE(bond));
 207 }
 208 static DEVICE_ATTR(mode, 0644, bonding_show_mode, bonding_sysfs_store_option);
 209
 210 /* Show the bonding transmit hash method. */
 211 static ssize_t bonding_show_xmit_hash(struct device *d,
 212                                       struct device_attribute *attr,
 213                                       char *buf)
 214 {
 215         struct bonding *bond = to_bond(d);
 216         const struct bond_opt_value *val;
 217
 218         val = bond_opt_get_val(BOND_OPT_XMIT_HASH, bond->params.xmit_policy);
 219
 220         return sysfs_emit(buf, "%s %d\n", val->string, bond->params.xmit_policy);
 221 }
 222 static DEVICE_ATTR(xmit_hash_policy, 0644,
 223                    bonding_show_xmit_hash, bonding_sysfs_store_option);
 224
 225 /* Show arp_validate. */
 226 static ssize_t bonding_show_arp_validate(struct device *d,
 227                                          struct device_attribute *attr,
 228                                          char *buf)
 229 {
 230         struct bonding *bond = to_bond(d);
 231         const struct bond_opt_value *val;
 232
 233         val = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
 234                                bond->params.arp_validate);
 235
 236         return sysfs_emit(buf, "%s %d\n", val->string, bond->params.arp_validate);
 237 }
 238 static DEVICE_ATTR(arp_validate, 0644, bonding_show_arp_validate,
 239                    bonding_sysfs_store_option);
 240
 241 /* Show arp_all_targets. */
 242 static ssize_t bonding_show_arp_all_targets(struct device *d,
 243                                          struct device_attribute *attr,
 244                                          char *buf)
 245 {
 246         struct bonding *bond = to_bond(d);
 247         const struct bond_opt_value *val;
 248
 249         val = bond_opt_get_val(BOND_OPT_ARP_ALL_TARGETS,
 250                                bond->params.arp_all_targets);
 251         return sysfs_emit(buf, "%s %d\n",
 252                        val->string, bond->params.arp_all_targets);
 253 }
 254 static DEVICE_ATTR(arp_all_targets, 0644,
 255                    bonding_show_arp_all_targets, bonding_sysfs_store_option);
 256
 257 /* Show fail_over_mac. */
 258 static ssize_t bonding_show_fail_over_mac(struct device *d,
 259                                           struct device_attribute *attr,
 260                                           char *buf)
 261 {
 262         struct bonding *bond = to_bond(d);
 263         const struct bond_opt_value *val;
 264
 265         val = bond_opt_get_val(BOND_OPT_FAIL_OVER_MAC,
 266                                bond->params.fail_over_mac);
 267
 268         return sysfs_emit(buf, "%s %d\n", val->string, bond->params.fail_over_mac);
 269 }
 270 static DEVICE_ATTR(fail_over_mac, 0644,
 271                    bonding_show_fail_over_mac, bonding_sysfs_store_option);
 272
 273 /* Show the arp timer interval. */
 274 static ssize_t bonding_show_arp_interval(struct device *d,
 275                                          struct device_attribute *attr,
 276                                          char *buf)
 277 {
 278         struct bonding *bond = to_bond(d);
 279
 280         return sysfs_emit(buf, "%d\n", bond->params.arp_interval);
 281 }
 282 static DEVICE_ATTR(arp_interval, 0644,
 283                    bonding_show_arp_interval, bonding_sysfs_store_option);
 284
 285 /* Show the arp targets. */
 286 static ssize_t bonding_show_arp_targets(struct device *d,
 287                                         struct device_attribute *attr,
 288                                         char *buf)
 289 {
 290         struct bonding *bond = to_bond(d);
 291         int i, res = 0;
 292
 293         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) {
 294                 if (bond->params.arp_targets[i])
 295                         res += sysfs_emit_at(buf, res, "%pI4 ",
 296                                              &bond->params.arp_targets[i]);
 297         }
 298         if (res)
 299                 buf[res-1] = '\n'; /* eat the leftover space */
 300
 301         return res;
 302 }
 303 static DEVICE_ATTR(arp_ip_target, 0644,
 304                    bonding_show_arp_targets, bonding_sysfs_store_option);
 305
 306 /* Show the arp missed max. */
 307 static ssize_t bonding_show_missed_max(struct device *d,
 308                                        struct device_attribute *attr,
 309                                        char *buf)
 310 {
 311         struct bonding *bond = to_bond(d);
 312
 313         return sysfs_emit(buf, "%u\n", bond->params.missed_max);
 314 }
 315 static DEVICE_ATTR(arp_missed_max, 0644,
 316                    bonding_show_missed_max, bonding_sysfs_store_option);
 317
 318 /* Show the up and down delays. */
 319 static ssize_t bonding_show_downdelay(struct device *d,
 320                                       struct device_attribute *attr,
 321                                       char *buf)
 322 {
 323         struct bonding *bond = to_bond(d);
 324
 325         return sysfs_emit(buf, "%d\n", bond->params.downdelay * bond->params.miimon);
 326 }
 327 static DEVICE_ATTR(downdelay, 0644,
 328                    bonding_show_downdelay, bonding_sysfs_store_option);
 329
 330 static ssize_t bonding_show_updelay(struct device *d,
 331                                     struct device_attribute *attr,
 332                                     char *buf)
 333 {
 334         struct bonding *bond = to_bond(d);
 335
 336         return sysfs_emit(buf, "%d\n", bond->params.updelay * bond->params.miimon);
 337
 338 }
 339 static DEVICE_ATTR(updelay, 0644,
 340                    bonding_show_updelay, bonding_sysfs_store_option);
 341
 342 static ssize_t bonding_show_peer_notif_delay(struct device *d,
 343                                              struct device_attribute *attr,
 344                                              char *buf)
 345 {
 346         struct bonding *bond = to_bond(d);
 347
 348         return sysfs_emit(buf, "%d\n",
 349                           bond->params.peer_notif_delay * bond->params.miimon);
 350 }
 351 static DEVICE_ATTR(peer_notif_delay, 0644,
 352                    bonding_show_peer_notif_delay, bonding_sysfs_store_option);
 353
 354 /* Show the LACP activity and interval. */
 355 static ssize_t bonding_show_lacp_active(struct device *d,
 356                                         struct device_attribute *attr,
 357                                         char *buf)
 358 {
 359         struct bonding *bond = to_bond(d);
 360         const struct bond_opt_value *val;
 361
 362         val = bond_opt_get_val(BOND_OPT_LACP_ACTIVE, bond->params.lacp_active);
 363
 364         return sysfs_emit(buf, "%s %d\n", val->string, bond->params.lacp_active);
 365 }
 366 static DEVICE_ATTR(lacp_active, 0644,
 367                    bonding_show_lacp_active, bonding_sysfs_store_option);
 368
 369 static ssize_t bonding_show_lacp_rate(struct device *d,
 370                                       struct device_attribute *attr,
 371                                       char *buf)
 372 {
 373         struct bonding *bond = to_bond(d);
 374         const struct bond_opt_value *val;
 375
 376         val = bond_opt_get_val(BOND_OPT_LACP_RATE, bond->params.lacp_fast);
 377
 378         return sysfs_emit(buf, "%s %d\n", val->string, bond->params.lacp_fast);
 379 }
 380 static DEVICE_ATTR(lacp_rate, 0644,
 381                    bonding_show_lacp_rate, bonding_sysfs_store_option);
 382
 383 static ssize_t bonding_show_min_links(struct device *d,
 384                                       struct device_attribute *attr,
 385                                       char *buf)
 386 {
 387         struct bonding *bond = to_bond(d);
 388
 389         return sysfs_emit(buf, "%u\n", bond->params.min_links);
 390 }
 391 static DEVICE_ATTR(min_links, 0644,
 392                    bonding_show_min_links, bonding_sysfs_store_option);
 393
 394 static ssize_t bonding_show_ad_select(struct device *d,
 395                                       struct device_attribute *attr,
 396                                       char *buf)
 397 {
 398         struct bonding *bond = to_bond(d);
 399         const struct bond_opt_value *val;
 400
 401         val = bond_opt_get_val(BOND_OPT_AD_SELECT, bond->params.ad_select);
 402
 403         return sysfs_emit(buf, "%s %d\n", val->string, bond->params.ad_select);
 404 }
 405 static DEVICE_ATTR(ad_select, 0644,
 406                    bonding_show_ad_select, bonding_sysfs_store_option);
 407
 408 /* Show the number of peer notifications to send after a failover event. */
 409 static ssize_t bonding_show_num_peer_notif(struct device *d,
 410                                            struct device_attribute *attr,
 411                                            char *buf)
 412 {
 413         struct bonding *bond = to_bond(d);
 414
 415         return sysfs_emit(buf, "%d\n", bond->params.num_peer_notif);
 416 }
 417 static DEVICE_ATTR(num_grat_arp, 0644,
 418                    bonding_show_num_peer_notif, bonding_sysfs_store_option);
 419 static DEVICE_ATTR(num_unsol_na, 0644,
 420                    bonding_show_num_peer_notif, bonding_sysfs_store_option);
 421
 422 /* Show the MII monitor interval. */
 423 static ssize_t bonding_show_miimon(struct device *d,
 424                                    struct device_attribute *attr,
 425                                    char *buf)
 426 {
 427         struct bonding *bond = to_bond(d);
 428
 429         return sysfs_emit(buf, "%d\n", bond->params.miimon);
 430 }
 431 static DEVICE_ATTR(miimon, 0644,
 432                    bonding_show_miimon, bonding_sysfs_store_option);
 433
 434 /* Show the primary slave. */
 435 static ssize_t bonding_show_primary(struct device *d,
 436                                     struct device_attribute *attr,
 437                                     char *buf)
 438 {
 439         struct bonding *bond = to_bond(d);
 440         struct slave *primary;
 441         int count = 0;
 442
 443         rcu_read_lock();
 444         primary = rcu_dereference(bond->primary_slave);
 445         if (primary)
 446                 count = sysfs_emit(buf, "%s\n", primary->dev->name);
 447         rcu_read_unlock();
 448
 449         return count;
 450 }
 451 static DEVICE_ATTR(primary, 0644,
 452                    bonding_show_primary, bonding_sysfs_store_option);
 453
 454 /* Show the primary_reselect flag. */
 455 static ssize_t bonding_show_primary_reselect(struct device *d,
 456                                              struct device_attribute *attr,
 457                                              char *buf)
 458 {
 459         struct bonding *bond = to_bond(d);
 460         const struct bond_opt_value *val;
 461
 462         val = bond_opt_get_val(BOND_OPT_PRIMARY_RESELECT,
 463                                bond->params.primary_reselect);
 464
 465         return sysfs_emit(buf, "%s %d\n",
 466                           val->string, bond->params.primary_reselect);
 467 }
 468 static DEVICE_ATTR(primary_reselect, 0644,
 469                    bonding_show_primary_reselect, bonding_sysfs_store_option);
 470
 471 /* Show the use_carrier flag. */
 472 static ssize_t bonding_show_carrier(struct device *d,
 473                                     struct device_attribute *attr,
 474                                     char *buf)
 475 {
 476         struct bonding *bond = to_bond(d);
 477
 478         return sysfs_emit(buf, "%d\n", bond->params.use_carrier);
 479 }
 480 static DEVICE_ATTR(use_carrier, 0644,
 481                    bonding_show_carrier, bonding_sysfs_store_option);
 482
 483
 484 /* Show currently active_slave. */
 485 static ssize_t bonding_show_active_slave(struct device *d,
 486                                          struct device_attribute *attr,
 487                                          char *buf)
 488 {
 489         struct bonding *bond = to_bond(d);
 490         struct net_device *slave_dev;
 491         int count = 0;
 492
 493         rcu_read_lock();
 494         slave_dev = bond_option_active_slave_get_rcu(bond);
 495         if (slave_dev)
 496                 count = sysfs_emit(buf, "%s\n", slave_dev->name);
 497         rcu_read_unlock();
 498
 499         return count;
 500 }
 501 static DEVICE_ATTR(active_slave, 0644,
 502                    bonding_show_active_slave, bonding_sysfs_store_option);
 503
 504 /* Show link status of the bond interface. */
 505 static ssize_t bonding_show_mii_status(struct device *d,
 506                                        struct device_attribute *attr,
 507                                        char *buf)
 508 {
 509         struct bonding *bond = to_bond(d);
 510         bool active = netif_carrier_ok(bond->dev);
 511
 512         return sysfs_emit(buf, "%s\n", active ? "up" : "down");
 513 }
 514 static DEVICE_ATTR(mii_status, 0444, bonding_show_mii_status, NULL);
 515
 516 /* Show current 802.3ad aggregator ID. */
 517 static ssize_t bonding_show_ad_aggregator(struct device *d,
 518                                           struct device_attribute *attr,
 519                                           char *buf)
 520 {
 521         int count = 0;
 522         struct bonding *bond = to_bond(d);
 523
 524         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
 525                 struct ad_info ad_info;
 526
 527                 count = sysfs_emit(buf, "%d\n",
 528                                    bond_3ad_get_active_agg_info(bond, &ad_info)
 529                                    ?  0 : ad_info.aggregator_id);
 530         }
 531
 532         return count;
 533 }
 534 static DEVICE_ATTR(ad_aggregator, 0444, bonding_show_ad_aggregator, NULL);
 535
 536
 537 /* Show number of active 802.3ad ports. */
 538 static ssize_t bonding_show_ad_num_ports(struct device *d,
 539                                          struct device_attribute *attr,
 540                                          char *buf)
 541 {
 542         int count = 0;
 543         struct bonding *bond = to_bond(d);
 544
 545         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
 546                 struct ad_info ad_info;
 547
 548                 count = sysfs_emit(buf, "%d\n",
 549                                    bond_3ad_get_active_agg_info(bond, &ad_info)
 550                                    ?  0 : ad_info.ports);
 551         }
 552
 553         return count;
 554 }
 555 static DEVICE_ATTR(ad_num_ports, 0444, bonding_show_ad_num_ports, NULL);
 556
 557
 558 /* Show current 802.3ad actor key. */
 559 static ssize_t bonding_show_ad_actor_key(struct device *d,
 560                                          struct device_attribute *attr,
 561                                          char *buf)
 562 {
 563         int count = 0;
 564         struct bonding *bond = to_bond(d);
 565
 566         if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN)) {
 567                 struct ad_info ad_info;
 568
 569                 count = sysfs_emit(buf, "%d\n",
 570                                    bond_3ad_get_active_agg_info(bond, &ad_info)
 571                                    ?  0 : ad_info.actor_key);
 572         }
 573
 574         return count;
 575 }
 576 static DEVICE_ATTR(ad_actor_key, 0444, bonding_show_ad_actor_key, NULL);
 577
 578
 579 /* Show current 802.3ad partner key. */
 580 static ssize_t bonding_show_ad_partner_key(struct device *d,
 581                                            struct device_attribute *attr,
 582                                            char *buf)
 583 {
 584         int count = 0;
 585         struct bonding *bond = to_bond(d);
 586
 587         if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN)) {
 588                 struct ad_info ad_info;
 589
 590                 count = sysfs_emit(buf, "%d\n",
 591                                    bond_3ad_get_active_agg_info(bond, &ad_info)
 592                                    ?  0 : ad_info.partner_key);
 593         }
 594
 595         return count;
 596 }
 597 static DEVICE_ATTR(ad_partner_key, 0444, bonding_show_ad_partner_key, NULL);
 598
 599
 600 /* Show current 802.3ad partner mac. */
 601 static ssize_t bonding_show_ad_partner_mac(struct device *d,
 602                                            struct device_attribute *attr,
 603                                            char *buf)
 604 {
 605         int count = 0;
 606         struct bonding *bond = to_bond(d);
 607
 608         if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN)) {
 609                 struct ad_info ad_info;
 610
 611                 if (!bond_3ad_get_active_agg_info(bond, &ad_info))
 612                         count = sysfs_emit(buf, "%pM\n", ad_info.partner_system);
 613         }
 614
 615         return count;
 616 }
 617 static DEVICE_ATTR(ad_partner_mac, 0444, bonding_show_ad_partner_mac, NULL);
 618
 619 /* Show the queue_ids of the slaves in the current bond. */
 620 static ssize_t bonding_show_queue_id(struct device *d,
 621                                      struct device_attribute *attr,
 622                                      char *buf)
 623 {
 624         struct bonding *bond = to_bond(d);
 625         struct list_head *iter;
 626         struct slave *slave;
 627         int res = 0;
 628
 629         if (!rtnl_trylock())
 630                 return restart_syscall();
 631
 632         bond_for_each_slave(bond, slave, iter) {
 633                 if (res > (PAGE_SIZE - IFNAMSIZ - 6)) {
 634                         /* not enough space for another interface_name:queue_id pair */
 635                         if ((PAGE_SIZE - res) > 10)
 636                                 res = PAGE_SIZE - 10;
 637                         res += sysfs_emit_at(buf, res, "++more++ ");
 638                         break;
 639                 }
 640                 res += sysfs_emit_at(buf, res, "%s:%d ",
 641                                      slave->dev->name, slave->queue_id);
 642         }
 643         if (res)
 644                 buf[res-1] = '\n'; /* eat the leftover space */
 645
 646         rtnl_unlock();
 647
 648         return res;
 649 }
 650 static DEVICE_ATTR(queue_id, 0644, bonding_show_queue_id,
 651                    bonding_sysfs_store_option);
 652
 653
 654 /* Show the all_slaves_active flag. */
 655 static ssize_t bonding_show_slaves_active(struct device *d,
 656                                           struct device_attribute *attr,
 657                                           char *buf)
 658 {
 659         struct bonding *bond = to_bond(d);
 660
 661         return sysfs_emit(buf, "%d\n", bond->params.all_slaves_active);
 662 }
 663 static DEVICE_ATTR(all_slaves_active, 0644,
 664                    bonding_show_slaves_active, bonding_sysfs_store_option);
 665
 666 /* Show the number of IGMP membership reports to send on link failure */
 667 static ssize_t bonding_show_resend_igmp(struct device *d,
 668                                         struct device_attribute *attr,
 669                                         char *buf)
 670 {
 671         struct bonding *bond = to_bond(d);
 672
 673         return sysfs_emit(buf, "%d\n", bond->params.resend_igmp);
 674 }
 675 static DEVICE_ATTR(resend_igmp, 0644,
 676                    bonding_show_resend_igmp, bonding_sysfs_store_option);
 677
 678
 679 static ssize_t bonding_show_lp_interval(struct device *d,
 680                                         struct device_attribute *attr,
 681                                         char *buf)
 682 {
 683         struct bonding *bond = to_bond(d);
 684
 685         return sysfs_emit(buf, "%d\n", bond->params.lp_interval);
 686 }
 687 static DEVICE_ATTR(lp_interval, 0644,
 688                    bonding_show_lp_interval, bonding_sysfs_store_option);
 689
 690 static ssize_t bonding_show_tlb_dynamic_lb(struct device *d,
 691                                            struct device_attribute *attr,
 692                                            char *buf)
 693 {
 694         struct bonding *bond = to_bond(d);
 695
 696         return sysfs_emit(buf, "%d\n", bond->params.tlb_dynamic_lb);
 697 }
 698 static DEVICE_ATTR(tlb_dynamic_lb, 0644,
 699                    bonding_show_tlb_dynamic_lb, bonding_sysfs_store_option);
 700
 701 static ssize_t bonding_show_packets_per_slave(struct device *d,
 702                                               struct device_attribute *attr,
 703                                               char *buf)
 704 {
 705         struct bonding *bond = to_bond(d);
 706         unsigned int packets_per_slave = bond->params.packets_per_slave;
 707
 708         return sysfs_emit(buf, "%u\n", packets_per_slave);
 709 }
 710 static DEVICE_ATTR(packets_per_slave, 0644,
 711                    bonding_show_packets_per_slave, bonding_sysfs_store_option);
 712
 713 static ssize_t bonding_show_ad_actor_sys_prio(struct device *d,
 714                                               struct device_attribute *attr,
 715                                               char *buf)
 716 {
 717         struct bonding *bond = to_bond(d);
 718
 719         if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN))
 720                 return sysfs_emit(buf, "%hu\n", bond->params.ad_actor_sys_prio);
 721
 722         return 0;
 723 }
 724 static DEVICE_ATTR(ad_actor_sys_prio, 0644,
 725                    bonding_show_ad_actor_sys_prio, bonding_sysfs_store_option);
 726
 727 static ssize_t bonding_show_ad_actor_system(struct device *d,
 728                                             struct device_attribute *attr,
 729                                             char *buf)
 730 {
 731         struct bonding *bond = to_bond(d);
 732
 733         if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN))
 734                 return sysfs_emit(buf, "%pM\n", bond->params.ad_actor_system);
 735
 736         return 0;
 737 }
 738
 739 static DEVICE_ATTR(ad_actor_system, 0644,
 740                    bonding_show_ad_actor_system, bonding_sysfs_store_option);
 741
 742 static ssize_t bonding_show_ad_user_port_key(struct device *d,
 743                                              struct device_attribute *attr,
 744                                              char *buf)
 745 {
 746         struct bonding *bond = to_bond(d);
 747
 748         if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN))
 749                 return sysfs_emit(buf, "%hu\n", bond->params.ad_user_port_key);
 750
 751         return 0;
 752 }
 753 static DEVICE_ATTR(ad_user_port_key, 0644,
 754                    bonding_show_ad_user_port_key, bonding_sysfs_store_option);
 755
 756 static struct attribute *per_bond_attrs[] = {
 757         &dev_attr_slaves.attr,
 758         &dev_attr_mode.attr,
 759         &dev_attr_fail_over_mac.attr,
 760         &dev_attr_arp_validate.attr,
 761         &dev_attr_arp_all_targets.attr,
 762         &dev_attr_arp_interval.attr,
 763         &dev_attr_arp_ip_target.attr,
 764         &dev_attr_downdelay.attr,
 765         &dev_attr_updelay.attr,
 766         &dev_attr_peer_notif_delay.attr,
 767         &dev_attr_lacp_active.attr,
 768         &dev_attr_lacp_rate.attr,
 769         &dev_attr_ad_select.attr,
 770         &dev_attr_xmit_hash_policy.attr,
 771         &dev_attr_num_grat_arp.attr,
 772         &dev_attr_num_unsol_na.attr,
 773         &dev_attr_miimon.attr,
 774         &dev_attr_primary.attr,
 775         &dev_attr_primary_reselect.attr,
 776         &dev_attr_use_carrier.attr,
 777         &dev_attr_active_slave.attr,
 778         &dev_attr_mii_status.attr,
 779         &dev_attr_ad_aggregator.attr,
 780         &dev_attr_ad_num_ports.attr,
 781         &dev_attr_ad_actor_key.attr,
 782         &dev_attr_ad_partner_key.attr,
 783         &dev_attr_ad_partner_mac.attr,
 784         &dev_attr_queue_id.attr,
 785         &dev_attr_all_slaves_active.attr,
 786         &dev_attr_resend_igmp.attr,
 787         &dev_attr_min_links.attr,
 788         &dev_attr_lp_interval.attr,
 789         &dev_attr_packets_per_slave.attr,
 790         &dev_attr_tlb_dynamic_lb.attr,
 791         &dev_attr_ad_actor_sys_prio.attr,
 792         &dev_attr_ad_actor_system.attr,
 793         &dev_attr_ad_user_port_key.attr,
 794         &dev_attr_arp_missed_max.attr,
 795         NULL,
 796 };
 797
 798 static const struct attribute_group bonding_group = {
 799         .name = "bonding",
 800         .attrs = per_bond_attrs,
 801 };
 802
 803 /* Initialize sysfs.  This sets up the bonding_masters file in
 804  * /sys/class/net.
 805  */
 806 int __net_init bond_create_sysfs(struct bond_net *bn)
 807 {
 808         int ret;
 809
 810         bn->class_attr_bonding_masters = class_attr_bonding_masters;
 811         sysfs_attr_init(&bn->class_attr_bonding_masters.attr);
 812
 813         ret = netdev_class_create_file_ns(&bn->class_attr_bonding_masters,
 814                                           bn->net);
 815         /* Permit multiple loads of the module by ignoring failures to
 816          * create the bonding_masters sysfs file.  Bonding devices
 817          * created by second or subsequent loads of the module will
 818          * not be listed in, or controllable by, bonding_masters, but
 819          * will have the usual "bonding" sysfs directory.
 820          *
 821          * This is done to preserve backwards compatibility for
 822          * initscripts/sysconfig, which load bonding multiple times to
 823          * configure multiple bonding devices.
 824          */
 825         if (ret == -EEXIST) {
 826                 /* Is someone being kinky and naming a device bonding_master? */
 827                 if (netdev_name_in_use(bn->net,
 828                                        class_attr_bonding_masters.attr.name))
 829                         pr_err("network device named %s already exists in sysfs\n",
 830                                class_attr_bonding_masters.attr.name);
 831                 ret = 0;
 832         }
 833
 834         return ret;
 835
 836 }
 837
 838 /* Remove /sys/class/net/bonding_masters. */
 839 void __net_exit bond_destroy_sysfs(struct bond_net *bn)
 840 {
 841         netdev_class_remove_file_ns(&bn->class_attr_bonding_masters, bn->net);
 842 }
 843
 844 /* Initialize sysfs for each bond.  This sets up and registers
 845  * the 'bondctl' directory for each individual bond under /sys/class/net.
 846  */
 847 void bond_prepare_sysfs_group(struct bonding *bond)
 848 {
 849         bond->dev->sysfs_groups[0] = &bonding_group;
 850 }
 851