root/drivers/net/bonding/bond_sysfs.c

DEFINITIONS

1. bonding_show_bonds
2. bond_get_by_name
3. bonding_store_bonds
4. bonding_sysfs_store_option
5. bonding_show_slaves
6. bonding_show_mode
7. bonding_show_xmit_hash
8. bonding_show_arp_validate
9. bonding_show_arp_all_targets
10. bonding_show_fail_over_mac
11. bonding_show_arp_interval
12. bonding_show_arp_targets
13. bonding_show_downdelay
14. bonding_show_updelay
15. bonding_show_peer_notif_delay
16. bonding_show_lacp
17. bonding_show_min_links
18. bonding_show_ad_select
19. bonding_show_num_peer_notif
20. bonding_show_miimon
21. bonding_show_primary
22. bonding_show_primary_reselect
23. bonding_show_carrier
24. bonding_show_active_slave
25. bonding_show_mii_status
26. bonding_show_ad_aggregator
27. bonding_show_ad_num_ports
28. bonding_show_ad_actor_key
29. bonding_show_ad_partner_key
30. bonding_show_ad_partner_mac
31. bonding_show_queue_id
32. bonding_show_slaves_active
33. bonding_show_resend_igmp
34. bonding_show_lp_interval
35. bonding_show_tlb_dynamic_lb
36. bonding_show_packets_per_slave
37. bonding_show_ad_actor_sys_prio
38. bonding_show_ad_actor_system
39. bonding_show_ad_user_port_key
40. bond_create_sysfs
41. bond_destroy_sysfs
42. bond_prepare_sysfs_group

   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(struct class *cls,
  35                                   struct class_attribute *attr,
  36                                   char *buf)
  37 {
  38         struct bond_net *bn =
  39                 container_of(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 += sprintf(buf + res, "++more++ ");
  51                         break;
  52                 }
  53                 res += sprintf(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(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(struct class *cls,
  79                                    struct class_attribute *attr,
  80                                    const char *buffer, size_t count)
  81 {
  82         struct bond_net *bn =
  83                 container_of(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 += sprintf(buf + res, "++more++ ");
 182                         break;
 183                 }
 184                 res += sprintf(buf + res, "%s ", slave->dev->name);
 185         }
 186 
 187         rtnl_unlock();
 188 
 189         if (res)
 190                 buf[res-1] = '\n'; /* eat the leftover space */
 191 
 192         return res;
 193 }
 194 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 sprintf(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 sprintf(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 sprintf(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 sprintf(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 sprintf(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 sprintf(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 += sprintf(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 up and down delays. */
 307 static ssize_t bonding_show_downdelay(struct device *d,
 308                                       struct device_attribute *attr,
 309                                       char *buf)
 310 {
 311         struct bonding *bond = to_bond(d);
 312 
 313         return sprintf(buf, "%d\n", bond->params.downdelay * bond->params.miimon);
 314 }
 315 static DEVICE_ATTR(downdelay, 0644,
 316                    bonding_show_downdelay, bonding_sysfs_store_option);
 317 
 318 static ssize_t bonding_show_updelay(struct device *d,
 319                                     struct device_attribute *attr,
 320                                     char *buf)
 321 {
 322         struct bonding *bond = to_bond(d);
 323 
 324         return sprintf(buf, "%d\n", bond->params.updelay * bond->params.miimon);
 325 
 326 }
 327 static DEVICE_ATTR(updelay, 0644,
 328                    bonding_show_updelay, bonding_sysfs_store_option);
 329 
 330 static ssize_t bonding_show_peer_notif_delay(struct device *d,
 331                                              struct device_attribute *attr,
 332                                              char *buf)
 333 {
 334         struct bonding *bond = to_bond(d);
 335 
 336         return sprintf(buf, "%d\n",
 337                        bond->params.peer_notif_delay * bond->params.miimon);
 338 }
 339 static DEVICE_ATTR(peer_notif_delay, 0644,
 340                    bonding_show_peer_notif_delay, bonding_sysfs_store_option);
 341 
 342 /* Show the LACP interval. */
 343 static ssize_t bonding_show_lacp(struct device *d,
 344                                  struct device_attribute *attr,
 345                                  char *buf)
 346 {
 347         struct bonding *bond = to_bond(d);
 348         const struct bond_opt_value *val;
 349 
 350         val = bond_opt_get_val(BOND_OPT_LACP_RATE, bond->params.lacp_fast);
 351 
 352         return sprintf(buf, "%s %d\n", val->string, bond->params.lacp_fast);
 353 }
 354 static DEVICE_ATTR(lacp_rate, 0644,
 355                    bonding_show_lacp, bonding_sysfs_store_option);
 356 
 357 static ssize_t bonding_show_min_links(struct device *d,
 358                                       struct device_attribute *attr,
 359                                       char *buf)
 360 {
 361         struct bonding *bond = to_bond(d);
 362 
 363         return sprintf(buf, "%u\n", bond->params.min_links);
 364 }
 365 static DEVICE_ATTR(min_links, 0644,
 366                    bonding_show_min_links, bonding_sysfs_store_option);
 367 
 368 static ssize_t bonding_show_ad_select(struct device *d,
 369                                       struct device_attribute *attr,
 370                                       char *buf)
 371 {
 372         struct bonding *bond = to_bond(d);
 373         const struct bond_opt_value *val;
 374 
 375         val = bond_opt_get_val(BOND_OPT_AD_SELECT, bond->params.ad_select);
 376 
 377         return sprintf(buf, "%s %d\n", val->string, bond->params.ad_select);
 378 }
 379 static DEVICE_ATTR(ad_select, 0644,
 380                    bonding_show_ad_select, bonding_sysfs_store_option);
 381 
 382 /* Show the number of peer notifications to send after a failover event. */
 383 static ssize_t bonding_show_num_peer_notif(struct device *d,
 384                                            struct device_attribute *attr,
 385                                            char *buf)
 386 {
 387         struct bonding *bond = to_bond(d);
 388         return sprintf(buf, "%d\n", bond->params.num_peer_notif);
 389 }
 390 static DEVICE_ATTR(num_grat_arp, 0644,
 391                    bonding_show_num_peer_notif, bonding_sysfs_store_option);
 392 static DEVICE_ATTR(num_unsol_na, 0644,
 393                    bonding_show_num_peer_notif, bonding_sysfs_store_option);
 394 
 395 /* Show the MII monitor interval. */
 396 static ssize_t bonding_show_miimon(struct device *d,
 397                                    struct device_attribute *attr,
 398                                    char *buf)
 399 {
 400         struct bonding *bond = to_bond(d);
 401 
 402         return sprintf(buf, "%d\n", bond->params.miimon);
 403 }
 404 static DEVICE_ATTR(miimon, 0644,
 405                    bonding_show_miimon, bonding_sysfs_store_option);
 406 
 407 /* Show the primary slave. */
 408 static ssize_t bonding_show_primary(struct device *d,
 409                                     struct device_attribute *attr,
 410                                     char *buf)
 411 {
 412         struct bonding *bond = to_bond(d);
 413         struct slave *primary;
 414         int count = 0;
 415 
 416         rcu_read_lock();
 417         primary = rcu_dereference(bond->primary_slave);
 418         if (primary)
 419                 count = sprintf(buf, "%s\n", primary->dev->name);
 420         rcu_read_unlock();
 421 
 422         return count;
 423 }
 424 static DEVICE_ATTR(primary, 0644,
 425                    bonding_show_primary, bonding_sysfs_store_option);
 426 
 427 /* Show the primary_reselect flag. */
 428 static ssize_t bonding_show_primary_reselect(struct device *d,
 429                                              struct device_attribute *attr,
 430                                              char *buf)
 431 {
 432         struct bonding *bond = to_bond(d);
 433         const struct bond_opt_value *val;
 434 
 435         val = bond_opt_get_val(BOND_OPT_PRIMARY_RESELECT,
 436                                bond->params.primary_reselect);
 437 
 438         return sprintf(buf, "%s %d\n",
 439                        val->string, bond->params.primary_reselect);
 440 }
 441 static DEVICE_ATTR(primary_reselect, 0644,
 442                    bonding_show_primary_reselect, bonding_sysfs_store_option);
 443 
 444 /* Show the use_carrier flag. */
 445 static ssize_t bonding_show_carrier(struct device *d,
 446                                     struct device_attribute *attr,
 447                                     char *buf)
 448 {
 449         struct bonding *bond = to_bond(d);
 450 
 451         return sprintf(buf, "%d\n", bond->params.use_carrier);
 452 }
 453 static DEVICE_ATTR(use_carrier, 0644,
 454                    bonding_show_carrier, bonding_sysfs_store_option);
 455 
 456 
 457 /* Show currently active_slave. */
 458 static ssize_t bonding_show_active_slave(struct device *d,
 459                                          struct device_attribute *attr,
 460                                          char *buf)
 461 {
 462         struct bonding *bond = to_bond(d);
 463         struct net_device *slave_dev;
 464         int count = 0;
 465 
 466         rcu_read_lock();
 467         slave_dev = bond_option_active_slave_get_rcu(bond);
 468         if (slave_dev)
 469                 count = sprintf(buf, "%s\n", slave_dev->name);
 470         rcu_read_unlock();
 471 
 472         return count;
 473 }
 474 static DEVICE_ATTR(active_slave, 0644,
 475                    bonding_show_active_slave, bonding_sysfs_store_option);
 476 
 477 /* Show link status of the bond interface. */
 478 static ssize_t bonding_show_mii_status(struct device *d,
 479                                        struct device_attribute *attr,
 480                                        char *buf)
 481 {
 482         struct bonding *bond = to_bond(d);
 483         bool active = netif_carrier_ok(bond->dev);
 484 
 485         return sprintf(buf, "%s\n", active ? "up" : "down");
 486 }
 487 static DEVICE_ATTR(mii_status, 0444, bonding_show_mii_status, NULL);
 488 
 489 /* Show current 802.3ad aggregator ID. */
 490 static ssize_t bonding_show_ad_aggregator(struct device *d,
 491                                           struct device_attribute *attr,
 492                                           char *buf)
 493 {
 494         int count = 0;
 495         struct bonding *bond = to_bond(d);
 496 
 497         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
 498                 struct ad_info ad_info;
 499                 count = sprintf(buf, "%d\n",
 500                                 bond_3ad_get_active_agg_info(bond, &ad_info)
 501                                 ?  0 : ad_info.aggregator_id);
 502         }
 503 
 504         return count;
 505 }
 506 static DEVICE_ATTR(ad_aggregator, 0444, bonding_show_ad_aggregator, NULL);
 507 
 508 
 509 /* Show number of active 802.3ad ports. */
 510 static ssize_t bonding_show_ad_num_ports(struct device *d,
 511                                          struct device_attribute *attr,
 512                                          char *buf)
 513 {
 514         int count = 0;
 515         struct bonding *bond = to_bond(d);
 516 
 517         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
 518                 struct ad_info ad_info;
 519                 count = sprintf(buf, "%d\n",
 520                                 bond_3ad_get_active_agg_info(bond, &ad_info)
 521                                 ?  0 : ad_info.ports);
 522         }
 523 
 524         return count;
 525 }
 526 static DEVICE_ATTR(ad_num_ports, 0444, bonding_show_ad_num_ports, NULL);
 527 
 528 
 529 /* Show current 802.3ad actor key. */
 530 static ssize_t bonding_show_ad_actor_key(struct device *d,
 531                                          struct device_attribute *attr,
 532                                          char *buf)
 533 {
 534         int count = 0;
 535         struct bonding *bond = to_bond(d);
 536 
 537         if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN)) {
 538                 struct ad_info ad_info;
 539                 count = sprintf(buf, "%d\n",
 540                                 bond_3ad_get_active_agg_info(bond, &ad_info)
 541                                 ?  0 : ad_info.actor_key);
 542         }
 543 
 544         return count;
 545 }
 546 static DEVICE_ATTR(ad_actor_key, 0444, bonding_show_ad_actor_key, NULL);
 547 
 548 
 549 /* Show current 802.3ad partner key. */
 550 static ssize_t bonding_show_ad_partner_key(struct device *d,
 551                                            struct device_attribute *attr,
 552                                            char *buf)
 553 {
 554         int count = 0;
 555         struct bonding *bond = to_bond(d);
 556 
 557         if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN)) {
 558                 struct ad_info ad_info;
 559                 count = sprintf(buf, "%d\n",
 560                                 bond_3ad_get_active_agg_info(bond, &ad_info)
 561                                 ?  0 : ad_info.partner_key);
 562         }
 563 
 564         return count;
 565 }
 566 static DEVICE_ATTR(ad_partner_key, 0444, bonding_show_ad_partner_key, NULL);
 567 
 568 
 569 /* Show current 802.3ad partner mac. */
 570 static ssize_t bonding_show_ad_partner_mac(struct device *d,
 571                                            struct device_attribute *attr,
 572                                            char *buf)
 573 {
 574         int count = 0;
 575         struct bonding *bond = to_bond(d);
 576 
 577         if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN)) {
 578                 struct ad_info ad_info;
 579                 if (!bond_3ad_get_active_agg_info(bond, &ad_info))
 580                         count = sprintf(buf, "%pM\n", ad_info.partner_system);
 581         }
 582 
 583         return count;
 584 }
 585 static DEVICE_ATTR(ad_partner_mac, 0444, bonding_show_ad_partner_mac, NULL);
 586 
 587 /* Show the queue_ids of the slaves in the current bond. */
 588 static ssize_t bonding_show_queue_id(struct device *d,
 589                                      struct device_attribute *attr,
 590                                      char *buf)
 591 {
 592         struct bonding *bond = to_bond(d);
 593         struct list_head *iter;
 594         struct slave *slave;
 595         int res = 0;
 596 
 597         if (!rtnl_trylock())
 598                 return restart_syscall();
 599 
 600         bond_for_each_slave(bond, slave, iter) {
 601                 if (res > (PAGE_SIZE - IFNAMSIZ - 6)) {
 602                         /* not enough space for another interface_name:queue_id pair */
 603                         if ((PAGE_SIZE - res) > 10)
 604                                 res = PAGE_SIZE - 10;
 605                         res += sprintf(buf + res, "++more++ ");
 606                         break;
 607                 }
 608                 res += sprintf(buf + res, "%s:%d ",
 609                                slave->dev->name, slave->queue_id);
 610         }
 611         if (res)
 612                 buf[res-1] = '\n'; /* eat the leftover space */
 613 
 614         rtnl_unlock();
 615 
 616         return res;
 617 }
 618 static DEVICE_ATTR(queue_id, 0644, bonding_show_queue_id,
 619                    bonding_sysfs_store_option);
 620 
 621 
 622 /* Show the all_slaves_active flag. */
 623 static ssize_t bonding_show_slaves_active(struct device *d,
 624                                           struct device_attribute *attr,
 625                                           char *buf)
 626 {
 627         struct bonding *bond = to_bond(d);
 628 
 629         return sprintf(buf, "%d\n", bond->params.all_slaves_active);
 630 }
 631 static DEVICE_ATTR(all_slaves_active, 0644,
 632                    bonding_show_slaves_active, bonding_sysfs_store_option);
 633 
 634 /* Show the number of IGMP membership reports to send on link failure */
 635 static ssize_t bonding_show_resend_igmp(struct device *d,
 636                                         struct device_attribute *attr,
 637                                         char *buf)
 638 {
 639         struct bonding *bond = to_bond(d);
 640 
 641         return sprintf(buf, "%d\n", bond->params.resend_igmp);
 642 }
 643 static DEVICE_ATTR(resend_igmp, 0644,
 644                    bonding_show_resend_igmp, bonding_sysfs_store_option);
 645 
 646 
 647 static ssize_t bonding_show_lp_interval(struct device *d,
 648                                         struct device_attribute *attr,
 649                                         char *buf)
 650 {
 651         struct bonding *bond = to_bond(d);
 652 
 653         return sprintf(buf, "%d\n", bond->params.lp_interval);
 654 }
 655 static DEVICE_ATTR(lp_interval, 0644,
 656                    bonding_show_lp_interval, bonding_sysfs_store_option);
 657 
 658 static ssize_t bonding_show_tlb_dynamic_lb(struct device *d,
 659                                            struct device_attribute *attr,
 660                                            char *buf)
 661 {
 662         struct bonding *bond = to_bond(d);
 663         return sprintf(buf, "%d\n", bond->params.tlb_dynamic_lb);
 664 }
 665 static DEVICE_ATTR(tlb_dynamic_lb, 0644,
 666                    bonding_show_tlb_dynamic_lb, bonding_sysfs_store_option);
 667 
 668 static ssize_t bonding_show_packets_per_slave(struct device *d,
 669                                               struct device_attribute *attr,
 670                                               char *buf)
 671 {
 672         struct bonding *bond = to_bond(d);
 673         unsigned int packets_per_slave = bond->params.packets_per_slave;
 674 
 675         return sprintf(buf, "%u\n", packets_per_slave);
 676 }
 677 static DEVICE_ATTR(packets_per_slave, 0644,
 678                    bonding_show_packets_per_slave, bonding_sysfs_store_option);
 679 
 680 static ssize_t bonding_show_ad_actor_sys_prio(struct device *d,
 681                                               struct device_attribute *attr,
 682                                               char *buf)
 683 {
 684         struct bonding *bond = to_bond(d);
 685 
 686         if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN))
 687                 return sprintf(buf, "%hu\n", bond->params.ad_actor_sys_prio);
 688 
 689         return 0;
 690 }
 691 static DEVICE_ATTR(ad_actor_sys_prio, 0644,
 692                    bonding_show_ad_actor_sys_prio, bonding_sysfs_store_option);
 693 
 694 static ssize_t bonding_show_ad_actor_system(struct device *d,
 695                                             struct device_attribute *attr,
 696                                             char *buf)
 697 {
 698         struct bonding *bond = to_bond(d);
 699 
 700         if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN))
 701                 return sprintf(buf, "%pM\n", bond->params.ad_actor_system);
 702 
 703         return 0;
 704 }
 705 
 706 static DEVICE_ATTR(ad_actor_system, 0644,
 707                    bonding_show_ad_actor_system, bonding_sysfs_store_option);
 708 
 709 static ssize_t bonding_show_ad_user_port_key(struct device *d,
 710                                              struct device_attribute *attr,
 711                                              char *buf)
 712 {
 713         struct bonding *bond = to_bond(d);
 714 
 715         if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN))
 716                 return sprintf(buf, "%hu\n", bond->params.ad_user_port_key);
 717 
 718         return 0;
 719 }
 720 static DEVICE_ATTR(ad_user_port_key, 0644,
 721                    bonding_show_ad_user_port_key, bonding_sysfs_store_option);
 722 
 723 static struct attribute *per_bond_attrs[] = {
 724         &dev_attr_slaves.attr,
 725         &dev_attr_mode.attr,
 726         &dev_attr_fail_over_mac.attr,
 727         &dev_attr_arp_validate.attr,
 728         &dev_attr_arp_all_targets.attr,
 729         &dev_attr_arp_interval.attr,
 730         &dev_attr_arp_ip_target.attr,
 731         &dev_attr_downdelay.attr,
 732         &dev_attr_updelay.attr,
 733         &dev_attr_peer_notif_delay.attr,
 734         &dev_attr_lacp_rate.attr,
 735         &dev_attr_ad_select.attr,
 736         &dev_attr_xmit_hash_policy.attr,
 737         &dev_attr_num_grat_arp.attr,
 738         &dev_attr_num_unsol_na.attr,
 739         &dev_attr_miimon.attr,
 740         &dev_attr_primary.attr,
 741         &dev_attr_primary_reselect.attr,
 742         &dev_attr_use_carrier.attr,
 743         &dev_attr_active_slave.attr,
 744         &dev_attr_mii_status.attr,
 745         &dev_attr_ad_aggregator.attr,
 746         &dev_attr_ad_num_ports.attr,
 747         &dev_attr_ad_actor_key.attr,
 748         &dev_attr_ad_partner_key.attr,
 749         &dev_attr_ad_partner_mac.attr,
 750         &dev_attr_queue_id.attr,
 751         &dev_attr_all_slaves_active.attr,
 752         &dev_attr_resend_igmp.attr,
 753         &dev_attr_min_links.attr,
 754         &dev_attr_lp_interval.attr,
 755         &dev_attr_packets_per_slave.attr,
 756         &dev_attr_tlb_dynamic_lb.attr,
 757         &dev_attr_ad_actor_sys_prio.attr,
 758         &dev_attr_ad_actor_system.attr,
 759         &dev_attr_ad_user_port_key.attr,
 760         NULL,
 761 };
 762 
 763 static const struct attribute_group bonding_group = {
 764         .name = "bonding",
 765         .attrs = per_bond_attrs,
 766 };
 767 
 768 /* Initialize sysfs.  This sets up the bonding_masters file in
 769  * /sys/class/net.
 770  */
 771 int bond_create_sysfs(struct bond_net *bn)
 772 {
 773         int ret;
 774 
 775         bn->class_attr_bonding_masters = class_attr_bonding_masters;
 776         sysfs_attr_init(&bn->class_attr_bonding_masters.attr);
 777 
 778         ret = netdev_class_create_file_ns(&bn->class_attr_bonding_masters,
 779                                           bn->net);
 780         /* Permit multiple loads of the module by ignoring failures to
 781          * create the bonding_masters sysfs file.  Bonding devices
 782          * created by second or subsequent loads of the module will
 783          * not be listed in, or controllable by, bonding_masters, but
 784          * will have the usual "bonding" sysfs directory.
 785          *
 786          * This is done to preserve backwards compatibility for
 787          * initscripts/sysconfig, which load bonding multiple times to
 788          * configure multiple bonding devices.
 789          */
 790         if (ret == -EEXIST) {
 791                 /* Is someone being kinky and naming a device bonding_master? */
 792                 if (__dev_get_by_name(bn->net,
 793                                       class_attr_bonding_masters.attr.name))
 794                         pr_err("network device named %s already exists in sysfs\n",
 795                                class_attr_bonding_masters.attr.name);
 796                 ret = 0;
 797         }
 798 
 799         return ret;
 800 
 801 }
 802 
 803 /* Remove /sys/class/net/bonding_masters. */
 804 void bond_destroy_sysfs(struct bond_net *bn)
 805 {
 806         netdev_class_remove_file_ns(&bn->class_attr_bonding_masters, bn->net);
 807 }
 808 
 809 /* Initialize sysfs for each bond.  This sets up and registers
 810  * the 'bondctl' directory for each individual bond under /sys/class/net.
 811  */
 812 void bond_prepare_sysfs_group(struct bonding *bond)
 813 {
 814         bond->dev->sysfs_groups[0] = &bonding_group;
 815 }
 816