net/wireless/core.c

   1 /*
   2  * This is the linux wireless configuration interface.
   3  *
   4  * Copyright 2006-2010          Johannes Berg <johannes@sipsolutions.net>
   5  * Copyright 2013-2014  Intel Mobile Communications GmbH
   6  */
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/if.h>
  11 #include <linux/module.h>
  12 #include <linux/err.h>
  13 #include <linux/list.h>
  14 #include <linux/slab.h>
  15 #include <linux/nl80211.h>
  16 #include <linux/debugfs.h>
  17 #include <linux/notifier.h>
  18 #include <linux/device.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/sched.h>
  22 #include <net/genetlink.h>
  23 #include <net/cfg80211.h>
  24 #include "nl80211.h"
  25 #include "core.h"
  26 #include "sysfs.h"
  27 #include "debugfs.h"
  28 #include "wext-compat.h"
  29 #include "rdev-ops.h"
  30
  31 /* name for sysfs, %d is appended */
  32 #define PHY_NAME "phy"
  33
  34 MODULE_AUTHOR("Johannes Berg");
  35 MODULE_LICENSE("GPL");
  36 MODULE_DESCRIPTION("wireless configuration support");
  37 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
  38
  39 /* RCU-protected (and RTNL for writers) */
  40 LIST_HEAD(cfg80211_rdev_list);
  41 int cfg80211_rdev_list_generation;
  42
  43 /* for debugfs */
  44 static struct dentry *ieee80211_debugfs_dir;
  45
  46 /* for the cleanup, scan and event works */
  47 struct workqueue_struct *cfg80211_wq;
  48
  49 static bool cfg80211_disable_40mhz_24ghz;
  50 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  51 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  52                  "Disable 40MHz support in the 2.4GHz band");
  53
  54 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  55 {
  56         struct cfg80211_registered_device *result = NULL, *rdev;
  57
  58         ASSERT_RTNL();
  59
  60         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  61                 if (rdev->wiphy_idx == wiphy_idx) {
  62                         result = rdev;
  63                         break;
  64                 }
  65         }
  66
  67         return result;
  68 }
  69
  70 int get_wiphy_idx(struct wiphy *wiphy)
  71 {
  72         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
  73
  74         return rdev->wiphy_idx;
  75 }
  76
  77 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  78 {
  79         struct cfg80211_registered_device *rdev;
  80
  81         ASSERT_RTNL();
  82
  83         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  84         if (!rdev)
  85                 return NULL;
  86         return &rdev->wiphy;
  87 }
  88
  89 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
  90                                    const char *newname)
  91 {
  92         struct cfg80211_registered_device *rdev2;
  93         int wiphy_idx, taken = -1, digits;
  94
  95         ASSERT_RTNL();
  96
  97         /* prohibit calling the thing phy%d when %d is not its number */
  98         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
  99         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 100                 /* count number of places needed to print wiphy_idx */
 101                 digits = 1;
 102                 while (wiphy_idx /= 10)
 103                         digits++;
 104                 /*
 105                  * deny the name if it is phy<idx> where <idx> is printed
 106                  * without leading zeroes. taken == strlen(newname) here
 107                  */
 108                 if (taken == strlen(PHY_NAME) + digits)
 109                         return -EINVAL;
 110         }
 111
 112         /* Ensure another device does not already have this name. */
 113         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 114                 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
 115                         return -EINVAL;
 116
 117         return 0;
 118 }
 119
 120 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 121                         char *newname)
 122 {
 123         int result;
 124
 125         ASSERT_RTNL();
 126
 127         /* Ignore nop renames */
 128         if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
 129                 return 0;
 130
 131         result = cfg80211_dev_check_name(rdev, newname);
 132         if (result < 0)
 133                 return result;
 134
 135         result = device_rename(&rdev->wiphy.dev, newname);
 136         if (result)
 137                 return result;
 138
 139         if (rdev->wiphy.debugfsdir &&
 140             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 141                             rdev->wiphy.debugfsdir,
 142                             rdev->wiphy.debugfsdir->d_parent,
 143                             newname))
 144                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 145
 146         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 147
 148         return 0;
 149 }
 150
 151 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 152                           struct net *net)
 153 {
 154         struct wireless_dev *wdev;
 155         int err = 0;
 156
 157         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 158                 return -EOPNOTSUPP;
 159
 160         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 161                 if (!wdev->netdev)
 162                         continue;
 163                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 164                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 165                 if (err)
 166                         break;
 167                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 168         }
 169
 170         if (err) {
 171                 /* failed -- clean up to old netns */
 172                 net = wiphy_net(&rdev->wiphy);
 173
 174                 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,
 175                                                      list) {
 176                         if (!wdev->netdev)
 177                                 continue;
 178                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 179                         err = dev_change_net_namespace(wdev->netdev, net,
 180                                                         "wlan%d");
 181                         WARN_ON(err);
 182                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 183                 }
 184
 185                 return err;
 186         }
 187
 188         wiphy_net_set(&rdev->wiphy, net);
 189
 190         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 191         WARN_ON(err);
 192
 193         return 0;
 194 }
 195
 196 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 197 {
 198         struct cfg80211_registered_device *rdev = data;
 199
 200         rdev_rfkill_poll(rdev);
 201 }
 202
 203 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 204                               struct wireless_dev *wdev)
 205 {
 206         ASSERT_RTNL();
 207
 208         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 209                 return;
 210
 211         if (!wdev->p2p_started)
 212                 return;
 213
 214         rdev_stop_p2p_device(rdev, wdev);
 215         wdev->p2p_started = false;
 216
 217         rdev->opencount--;
 218
 219         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 220                 if (WARN_ON(!rdev->scan_req->notified))
 221                         rdev->scan_req->aborted = true;
 222                 ___cfg80211_scan_done(rdev, false);
 223         }
 224 }
 225
 226 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 227 {
 228         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 229         struct wireless_dev *wdev;
 230
 231         ASSERT_RTNL();
 232
 233         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 234                 if (wdev->netdev) {
 235                         dev_close(wdev->netdev);
 236                         continue;
 237                 }
 238                 /* otherwise, check iftype */
 239                 switch (wdev->iftype) {
 240                 case NL80211_IFTYPE_P2P_DEVICE:
 241                         cfg80211_stop_p2p_device(rdev, wdev);
 242                         break;
 243                 default:
 244                         break;
 245                 }
 246         }
 247 }
 248 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 249
 250 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 251 {
 252         struct cfg80211_registered_device *rdev = data;
 253
 254         if (!blocked)
 255                 return 0;
 256
 257         rtnl_lock();
 258         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 259         rtnl_unlock();
 260
 261         return 0;
 262 }
 263
 264 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 265 {
 266         struct cfg80211_registered_device *rdev;
 267
 268         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 269         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 270 }
 271
 272 static void cfg80211_event_work(struct work_struct *work)
 273 {
 274         struct cfg80211_registered_device *rdev;
 275
 276         rdev = container_of(work, struct cfg80211_registered_device,
 277                             event_work);
 278
 279         rtnl_lock();
 280         cfg80211_process_rdev_events(rdev);
 281         rtnl_unlock();
 282 }
 283
 284 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 285 {
 286         struct cfg80211_iface_destroy *item;
 287
 288         ASSERT_RTNL();
 289
 290         spin_lock_irq(&rdev->destroy_list_lock);
 291         while ((item = list_first_entry_or_null(&rdev->destroy_list,
 292                                                 struct cfg80211_iface_destroy,
 293                                                 list))) {
 294                 struct wireless_dev *wdev, *tmp;
 295                 u32 nlportid = item->nlportid;
 296
 297                 list_del(&item->list);
 298                 kfree(item);
 299                 spin_unlock_irq(&rdev->destroy_list_lock);
 300
 301                 list_for_each_entry_safe(wdev, tmp, &rdev->wdev_list, list) {
 302                         if (nlportid == wdev->owner_nlportid)
 303                                 rdev_del_virtual_intf(rdev, wdev);
 304                 }
 305
 306                 spin_lock_irq(&rdev->destroy_list_lock);
 307         }
 308         spin_unlock_irq(&rdev->destroy_list_lock);
 309 }
 310
 311 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 312 {
 313         struct cfg80211_registered_device *rdev;
 314
 315         rdev = container_of(work, struct cfg80211_registered_device,
 316                             destroy_work);
 317
 318         rtnl_lock();
 319         cfg80211_destroy_ifaces(rdev);
 320         rtnl_unlock();
 321 }
 322
 323 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
 324 {
 325         struct cfg80211_registered_device *rdev;
 326
 327         rdev = container_of(work, struct cfg80211_registered_device,
 328                            sched_scan_stop_wk);
 329
 330         rtnl_lock();
 331
 332         __cfg80211_stop_sched_scan(rdev, false);
 333
 334         rtnl_unlock();
 335 }
 336
 337 /* exported functions */
 338
 339 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 340                            const char *requested_name)
 341 {
 342         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 343
 344         struct cfg80211_registered_device *rdev;
 345         int alloc_size;
 346
 347         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 348         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 349         WARN_ON(ops->connect && !ops->disconnect);
 350         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 351         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 352         WARN_ON(ops->add_station && !ops->del_station);
 353         WARN_ON(ops->add_mpath && !ops->del_mpath);
 354         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 355         WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
 356         WARN_ON(ops->start_ap && !ops->stop_ap);
 357         WARN_ON(ops->join_ocb && !ops->leave_ocb);
 358         WARN_ON(ops->suspend && !ops->resume);
 359         WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
 360         WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
 361         WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
 362         WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
 363         WARN_ON(ops->set_tx_power && !ops->get_tx_power);
 364         WARN_ON(ops->set_antenna && !ops->get_antenna);
 365
 366         alloc_size = sizeof(*rdev) + sizeof_priv;
 367
 368         rdev = kzalloc(alloc_size, GFP_KERNEL);
 369         if (!rdev)
 370                 return NULL;
 371
 372         rdev->ops = ops;
 373
 374         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 375
 376         if (unlikely(rdev->wiphy_idx < 0)) {
 377                 /* ugh, wrapped! */
 378                 atomic_dec(&wiphy_counter);
 379                 kfree(rdev);
 380                 return NULL;
 381         }
 382
 383         /* atomic_inc_return makes it start at 1, make it start at 0 */
 384         rdev->wiphy_idx--;
 385
 386         /* give it a proper name */
 387         if (requested_name && requested_name[0]) {
 388                 int rv;
 389
 390                 rtnl_lock();
 391                 rv = cfg80211_dev_check_name(rdev, requested_name);
 392
 393                 if (rv < 0) {
 394                         rtnl_unlock();
 395                         goto use_default_name;
 396                 }
 397
 398                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 399                 rtnl_unlock();
 400                 if (rv)
 401                         goto use_default_name;
 402         } else {
 403 use_default_name:
 404                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 405                  * the restrictions on phy names.  Probably this call could
 406                  * fail if some other part of the kernel (re)named a device
 407                  * phyX.  But, might should add some locking and check return
 408                  * value, and use a different name if this one exists?
 409                  */
 410                 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 411         }
 412
 413         INIT_LIST_HEAD(&rdev->wdev_list);
 414         INIT_LIST_HEAD(&rdev->beacon_registrations);
 415         spin_lock_init(&rdev->beacon_registrations_lock);
 416         spin_lock_init(&rdev->bss_lock);
 417         INIT_LIST_HEAD(&rdev->bss_list);
 418         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 419         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 420         INIT_LIST_HEAD(&rdev->mlme_unreg);
 421         spin_lock_init(&rdev->mlme_unreg_lock);
 422         INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
 423         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 424                           cfg80211_dfs_channels_update_work);
 425 #ifdef CONFIG_CFG80211_WEXT
 426         rdev->wiphy.wext = &cfg80211_wext_handler;
 427 #endif
 428
 429         device_initialize(&rdev->wiphy.dev);
 430         rdev->wiphy.dev.class = &ieee80211_class;
 431         rdev->wiphy.dev.platform_data = rdev;
 432         device_enable_async_suspend(&rdev->wiphy.dev);
 433
 434         INIT_LIST_HEAD(&rdev->destroy_list);
 435         spin_lock_init(&rdev->destroy_list_lock);
 436         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 437         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 438
 439 #ifdef CONFIG_CFG80211_DEFAULT_PS
 440         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 441 #endif
 442
 443         wiphy_net_set(&rdev->wiphy, &init_net);
 444
 445         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 446         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 447                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 448                                    &rdev->rfkill_ops, rdev);
 449
 450         if (!rdev->rfkill) {
 451                 kfree(rdev);
 452                 return NULL;
 453         }
 454
 455         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 456         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 457         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 458
 459         init_waitqueue_head(&rdev->dev_wait);
 460
 461         /*
 462          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 463          * Fragmentation and RTS threshold are disabled by default with the
 464          * special -1 value.
 465          */
 466         rdev->wiphy.retry_short = 7;
 467         rdev->wiphy.retry_long = 4;
 468         rdev->wiphy.frag_threshold = (u32) -1;
 469         rdev->wiphy.rts_threshold = (u32) -1;
 470         rdev->wiphy.coverage_class = 0;
 471
 472         rdev->wiphy.max_num_csa_counters = 1;
 473
 474         rdev->wiphy.max_sched_scan_plans = 1;
 475         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 476
 477         return &rdev->wiphy;
 478 }
 479 EXPORT_SYMBOL(wiphy_new_nm);
 480
 481 static int wiphy_verify_combinations(struct wiphy *wiphy)
 482 {
 483         const struct ieee80211_iface_combination *c;
 484         int i, j;
 485
 486         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 487                 u32 cnt = 0;
 488                 u16 all_iftypes = 0;
 489
 490                 c = &wiphy->iface_combinations[i];
 491
 492                 /*
 493                  * Combinations with just one interface aren't real,
 494                  * however we make an exception for DFS.
 495                  */
 496                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 497                         return -EINVAL;
 498
 499                 /* Need at least one channel */
 500                 if (WARN_ON(!c->num_different_channels))
 501                         return -EINVAL;
 502
 503                 /*
 504                  * Put a sane limit on maximum number of different
 505                  * channels to simplify channel accounting code.
 506                  */
 507                 if (WARN_ON(c->num_different_channels >
 508                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 509                         return -EINVAL;
 510
 511                 /* DFS only works on one channel. */
 512                 if (WARN_ON(c->radar_detect_widths &&
 513                             (c->num_different_channels > 1)))
 514                         return -EINVAL;
 515
 516                 if (WARN_ON(!c->n_limits))
 517                         return -EINVAL;
 518
 519                 for (j = 0; j < c->n_limits; j++) {
 520                         u16 types = c->limits[j].types;
 521
 522                         /* interface types shouldn't overlap */
 523                         if (WARN_ON(types & all_iftypes))
 524                                 return -EINVAL;
 525                         all_iftypes |= types;
 526
 527                         if (WARN_ON(!c->limits[j].max))
 528                                 return -EINVAL;
 529
 530                         /* Shouldn't list software iftypes in combinations! */
 531                         if (WARN_ON(wiphy->software_iftypes & types))
 532                                 return -EINVAL;
 533
 534                         /* Only a single P2P_DEVICE can be allowed */
 535                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 536                                     c->limits[j].max > 1))
 537                                 return -EINVAL;
 538
 539                         cnt += c->limits[j].max;
 540                         /*
 541                          * Don't advertise an unsupported type
 542                          * in a combination.
 543                          */
 544                         if (WARN_ON((wiphy->interface_modes & types) != types))
 545                                 return -EINVAL;
 546                 }
 547
 548                 /* You can't even choose that many! */
 549                 if (WARN_ON(cnt < c->max_interfaces))
 550                         return -EINVAL;
 551         }
 552
 553         return 0;
 554 }
 555
 556 int wiphy_register(struct wiphy *wiphy)
 557 {
 558         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 559         int res;
 560         enum nl80211_band band;
 561         struct ieee80211_supported_band *sband;
 562         bool have_band = false;
 563         int i;
 564         u16 ifmodes = wiphy->interface_modes;
 565
 566 #ifdef CONFIG_PM
 567         if (WARN_ON(wiphy->wowlan &&
 568                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 569                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 570                 return -EINVAL;
 571         if (WARN_ON(wiphy->wowlan &&
 572                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 573                     !wiphy->wowlan->tcp))
 574                 return -EINVAL;
 575 #endif
 576         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 577                     (!rdev->ops->tdls_channel_switch ||
 578                      !rdev->ops->tdls_cancel_channel_switch)))
 579                 return -EINVAL;
 580
 581         /*
 582          * if a wiphy has unsupported modes for regulatory channel enforcement,
 583          * opt-out of enforcement checking
 584          */
 585         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 586                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 587                                        BIT(NL80211_IFTYPE_AP) |
 588                                        BIT(NL80211_IFTYPE_P2P_GO) |
 589                                        BIT(NL80211_IFTYPE_ADHOC) |
 590                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 591                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 592                                        BIT(NL80211_IFTYPE_MONITOR)))
 593                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 594
 595         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 596                     (wiphy->regulatory_flags &
 597                                         (REGULATORY_CUSTOM_REG |
 598                                          REGULATORY_STRICT_REG |
 599                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 600                                          REGULATORY_COUNTRY_IE_IGNORE))))
 601                 return -EINVAL;
 602
 603         if (WARN_ON(wiphy->coalesce &&
 604                     (!wiphy->coalesce->n_rules ||
 605                      !wiphy->coalesce->n_patterns) &&
 606                     (!wiphy->coalesce->pattern_min_len ||
 607                      wiphy->coalesce->pattern_min_len >
 608                         wiphy->coalesce->pattern_max_len)))
 609                 return -EINVAL;
 610
 611         if (WARN_ON(wiphy->ap_sme_capa &&
 612                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 613                 return -EINVAL;
 614
 615         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 616                 return -EINVAL;
 617
 618         if (WARN_ON(wiphy->addresses &&
 619                     !is_zero_ether_addr(wiphy->perm_addr) &&
 620                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 621                            ETH_ALEN)))
 622                 return -EINVAL;
 623
 624         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 625                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 626                      !rdev->ops->set_mac_acl)))
 627                 return -EINVAL;
 628
 629         /* assure only valid behaviours are flagged by driver
 630          * hence subtract 2 as bit 0 is invalid.
 631          */
 632         if (WARN_ON(wiphy->bss_select_support &&
 633                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 634                 return -EINVAL;
 635
 636         if (wiphy->addresses)
 637                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 638
 639         /* sanity check ifmodes */
 640         WARN_ON(!ifmodes);
 641         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 642         if (WARN_ON(ifmodes != wiphy->interface_modes))
 643                 wiphy->interface_modes = ifmodes;
 644
 645         res = wiphy_verify_combinations(wiphy);
 646         if (res)
 647                 return res;
 648
 649         /* sanity check supported bands/channels */
 650         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 651                 sband = wiphy->bands[band];
 652                 if (!sband)
 653                         continue;
 654
 655                 sband->band = band;
 656                 if (WARN_ON(!sband->n_channels))
 657                         return -EINVAL;
 658                 /*
 659                  * on 60GHz band, there are no legacy rates, so
 660                  * n_bitrates is 0
 661                  */
 662                 if (WARN_ON(band != NL80211_BAND_60GHZ &&
 663                             !sband->n_bitrates))
 664                         return -EINVAL;
 665
 666                 /*
 667                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 668                  * modify the sband's ht data even if the driver uses a
 669                  * global structure for that.
 670                  */
 671                 if (cfg80211_disable_40mhz_24ghz &&
 672                     band == NL80211_BAND_2GHZ &&
 673                     sband->ht_cap.ht_supported) {
 674                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 675                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 676                 }
 677
 678                 /*
 679                  * Since we use a u32 for rate bitmaps in
 680                  * ieee80211_get_response_rate, we cannot
 681                  * have more than 32 legacy rates.
 682                  */
 683                 if (WARN_ON(sband->n_bitrates > 32))
 684                         return -EINVAL;
 685
 686                 for (i = 0; i < sband->n_channels; i++) {
 687                         sband->channels[i].orig_flags =
 688                                 sband->channels[i].flags;
 689                         sband->channels[i].orig_mag = INT_MAX;
 690                         sband->channels[i].orig_mpwr =
 691                                 sband->channels[i].max_power;
 692                         sband->channels[i].band = band;
 693                 }
 694
 695                 have_band = true;
 696         }
 697
 698         if (!have_band) {
 699                 WARN_ON(1);
 700                 return -EINVAL;
 701         }
 702
 703 #ifdef CONFIG_PM
 704         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 705                     (!rdev->wiphy.wowlan->pattern_min_len ||
 706                      rdev->wiphy.wowlan->pattern_min_len >
 707                                 rdev->wiphy.wowlan->pattern_max_len)))
 708                 return -EINVAL;
 709 #endif
 710
 711         /* check and set up bitrates */
 712         ieee80211_set_bitrate_flags(wiphy);
 713
 714         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 715
 716         rtnl_lock();
 717         res = device_add(&rdev->wiphy.dev);
 718         if (res) {
 719                 rtnl_unlock();
 720                 return res;
 721         }
 722
 723         /* set up regulatory info */
 724         wiphy_regulatory_register(wiphy);
 725
 726         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 727         cfg80211_rdev_list_generation++;
 728
 729         /* add to debugfs */
 730         rdev->wiphy.debugfsdir =
 731                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 732                                    ieee80211_debugfs_dir);
 733         if (IS_ERR(rdev->wiphy.debugfsdir))
 734                 rdev->wiphy.debugfsdir = NULL;
 735
 736         cfg80211_debugfs_rdev_add(rdev);
 737         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 738
 739         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 740                 struct regulatory_request request;
 741
 742                 request.wiphy_idx = get_wiphy_idx(wiphy);
 743                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 744                 request.alpha2[0] = '9';
 745                 request.alpha2[1] = '9';
 746
 747                 nl80211_send_reg_change_event(&request);
 748         }
 749
 750         rdev->wiphy.registered = true;
 751         rtnl_unlock();
 752
 753         res = rfkill_register(rdev->rfkill);
 754         if (res) {
 755                 rfkill_destroy(rdev->rfkill);
 756                 rdev->rfkill = NULL;
 757                 wiphy_unregister(&rdev->wiphy);
 758                 return res;
 759         }
 760
 761         return 0;
 762 }
 763 EXPORT_SYMBOL(wiphy_register);
 764
 765 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 766 {
 767         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 768
 769         if (!rdev->ops->rfkill_poll)
 770                 return;
 771         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 772         rfkill_resume_polling(rdev->rfkill);
 773 }
 774 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 775
 776 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 777 {
 778         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 779
 780         rfkill_pause_polling(rdev->rfkill);
 781 }
 782 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 783
 784 void wiphy_unregister(struct wiphy *wiphy)
 785 {
 786         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 787
 788         wait_event(rdev->dev_wait, ({
 789                 int __count;
 790                 rtnl_lock();
 791                 __count = rdev->opencount;
 792                 rtnl_unlock();
 793                 __count == 0; }));
 794
 795         if (rdev->rfkill)
 796                 rfkill_unregister(rdev->rfkill);
 797
 798         rtnl_lock();
 799         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 800         rdev->wiphy.registered = false;
 801
 802         WARN_ON(!list_empty(&rdev->wdev_list));
 803
 804         /*
 805          * First remove the hardware from everywhere, this makes
 806          * it impossible to find from userspace.
 807          */
 808         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 809         list_del_rcu(&rdev->list);
 810         synchronize_rcu();
 811
 812         /*
 813          * If this device got a regulatory hint tell core its
 814          * free to listen now to a new shiny device regulatory hint
 815          */
 816         wiphy_regulatory_deregister(wiphy);
 817
 818         cfg80211_rdev_list_generation++;
 819         device_del(&rdev->wiphy.dev);
 820
 821         rtnl_unlock();
 822
 823         flush_work(&rdev->scan_done_wk);
 824         cancel_work_sync(&rdev->conn_work);
 825         flush_work(&rdev->event_work);
 826         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 827         flush_work(&rdev->destroy_work);
 828         flush_work(&rdev->sched_scan_stop_wk);
 829         flush_work(&rdev->mlme_unreg_wk);
 830
 831 #ifdef CONFIG_PM
 832         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
 833                 rdev_set_wakeup(rdev, false);
 834 #endif
 835         cfg80211_rdev_free_wowlan(rdev);
 836         cfg80211_rdev_free_coalesce(rdev);
 837 }
 838 EXPORT_SYMBOL(wiphy_unregister);
 839
 840 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 841 {
 842         struct cfg80211_internal_bss *scan, *tmp;
 843         struct cfg80211_beacon_registration *reg, *treg;
 844         rfkill_destroy(rdev->rfkill);
 845         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 846                 list_del(&reg->list);
 847                 kfree(reg);
 848         }
 849         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 850                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 851         kfree(rdev);
 852 }
 853
 854 void wiphy_free(struct wiphy *wiphy)
 855 {
 856         put_device(&wiphy->dev);
 857 }
 858 EXPORT_SYMBOL(wiphy_free);
 859
 860 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 861 {
 862         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 863
 864         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 865                 schedule_work(&rdev->rfkill_sync);
 866 }
 867 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 868
 869 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 870 {
 871         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 872
 873         ASSERT_RTNL();
 874
 875         if (WARN_ON(wdev->netdev))
 876                 return;
 877
 878         list_del_rcu(&wdev->list);
 879         rdev->devlist_generation++;
 880
 881         switch (wdev->iftype) {
 882         case NL80211_IFTYPE_P2P_DEVICE:
 883                 cfg80211_mlme_purge_registrations(wdev);
 884                 cfg80211_stop_p2p_device(rdev, wdev);
 885                 break;
 886         default:
 887                 WARN_ON_ONCE(1);
 888                 break;
 889         }
 890 }
 891 EXPORT_SYMBOL(cfg80211_unregister_wdev);
 892
 893 static const struct device_type wiphy_type = {
 894         .name   = "wlan",
 895 };
 896
 897 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 898                                enum nl80211_iftype iftype, int num)
 899 {
 900         ASSERT_RTNL();
 901
 902         rdev->num_running_ifaces += num;
 903         if (iftype == NL80211_IFTYPE_MONITOR)
 904                 rdev->num_running_monitor_ifaces += num;
 905 }
 906
 907 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
 908                       struct wireless_dev *wdev)
 909 {
 910         struct net_device *dev = wdev->netdev;
 911         struct cfg80211_sched_scan_request *sched_scan_req;
 912
 913         ASSERT_RTNL();
 914         ASSERT_WDEV_LOCK(wdev);
 915
 916         switch (wdev->iftype) {
 917         case NL80211_IFTYPE_ADHOC:
 918                 __cfg80211_leave_ibss(rdev, dev, true);
 919                 break;
 920         case NL80211_IFTYPE_P2P_CLIENT:
 921         case NL80211_IFTYPE_STATION:
 922                 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
 923                 if (sched_scan_req && dev == sched_scan_req->dev)
 924                         __cfg80211_stop_sched_scan(rdev, false);
 925
 926 #ifdef CONFIG_CFG80211_WEXT
 927                 kfree(wdev->wext.ie);
 928                 wdev->wext.ie = NULL;
 929                 wdev->wext.ie_len = 0;
 930                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 931 #endif
 932                 cfg80211_disconnect(rdev, dev,
 933                                     WLAN_REASON_DEAUTH_LEAVING, true);
 934                 break;
 935         case NL80211_IFTYPE_MESH_POINT:
 936                 __cfg80211_leave_mesh(rdev, dev);
 937                 break;
 938         case NL80211_IFTYPE_AP:
 939         case NL80211_IFTYPE_P2P_GO:
 940                 __cfg80211_stop_ap(rdev, dev, true);
 941                 break;
 942         case NL80211_IFTYPE_OCB:
 943                 __cfg80211_leave_ocb(rdev, dev);
 944                 break;
 945         case NL80211_IFTYPE_WDS:
 946                 /* must be handled by mac80211/driver, has no APIs */
 947                 break;
 948         case NL80211_IFTYPE_P2P_DEVICE:
 949                 /* cannot happen, has no netdev */
 950                 break;
 951         case NL80211_IFTYPE_AP_VLAN:
 952         case NL80211_IFTYPE_MONITOR:
 953                 /* nothing to do */
 954                 break;
 955         case NL80211_IFTYPE_UNSPECIFIED:
 956         case NUM_NL80211_IFTYPES:
 957                 /* invalid */
 958                 break;
 959         }
 960 }
 961
 962 void cfg80211_leave(struct cfg80211_registered_device *rdev,
 963                     struct wireless_dev *wdev)
 964 {
 965         wdev_lock(wdev);
 966         __cfg80211_leave(rdev, wdev);
 967         wdev_unlock(wdev);
 968 }
 969
 970 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
 971                          gfp_t gfp)
 972 {
 973         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 974         struct cfg80211_event *ev;
 975         unsigned long flags;
 976
 977         trace_cfg80211_stop_iface(wiphy, wdev);
 978
 979         ev = kzalloc(sizeof(*ev), gfp);
 980         if (!ev)
 981                 return;
 982
 983         ev->type = EVENT_STOPPED;
 984
 985         spin_lock_irqsave(&wdev->event_lock, flags);
 986         list_add_tail(&ev->list, &wdev->event_list);
 987         spin_unlock_irqrestore(&wdev->event_lock, flags);
 988         queue_work(cfg80211_wq, &rdev->event_work);
 989 }
 990 EXPORT_SYMBOL(cfg80211_stop_iface);
 991
 992 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 993                                          unsigned long state, void *ptr)
 994 {
 995         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 996         struct wireless_dev *wdev = dev->ieee80211_ptr;
 997         struct cfg80211_registered_device *rdev;
 998         struct cfg80211_sched_scan_request *sched_scan_req;
 999
1000         if (!wdev)
1001                 return NOTIFY_DONE;
1002
1003         rdev = wiphy_to_rdev(wdev->wiphy);
1004
1005         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1006
1007         switch (state) {
1008         case NETDEV_POST_INIT:
1009                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1010                 break;
1011         case NETDEV_REGISTER:
1012                 /*
1013                  * NB: cannot take rdev->mtx here because this may be
1014                  * called within code protected by it when interfaces
1015                  * are added with nl80211.
1016                  */
1017                 mutex_init(&wdev->mtx);
1018                 INIT_LIST_HEAD(&wdev->event_list);
1019                 spin_lock_init(&wdev->event_lock);
1020                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1021                 spin_lock_init(&wdev->mgmt_registrations_lock);
1022
1023                 wdev->identifier = ++rdev->wdev_id;
1024                 list_add_rcu(&wdev->list, &rdev->wdev_list);
1025                 rdev->devlist_generation++;
1026                 /* can only change netns with wiphy */
1027                 dev->features |= NETIF_F_NETNS_LOCAL;
1028
1029                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1030                                       "phy80211")) {
1031                         pr_err("failed to add phy80211 symlink to netdev!\n");
1032                 }
1033                 wdev->netdev = dev;
1034 #ifdef CONFIG_CFG80211_WEXT
1035                 wdev->wext.default_key = -1;
1036                 wdev->wext.default_mgmt_key = -1;
1037                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1038 #endif
1039
1040                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1041                         wdev->ps = true;
1042                 else
1043                         wdev->ps = false;
1044                 /* allow mac80211 to determine the timeout */
1045                 wdev->ps_timeout = -1;
1046
1047                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1048                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1049                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1050                         dev->priv_flags |= IFF_DONT_BRIDGE;
1051                 break;
1052         case NETDEV_GOING_DOWN:
1053                 cfg80211_leave(rdev, wdev);
1054                 break;
1055         case NETDEV_DOWN:
1056                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1057                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1058                         if (WARN_ON(!rdev->scan_req->notified))
1059                                 rdev->scan_req->aborted = true;
1060                         ___cfg80211_scan_done(rdev, false);
1061                 }
1062
1063                 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1064                 if (WARN_ON(sched_scan_req &&
1065                             sched_scan_req->dev == wdev->netdev)) {
1066                         __cfg80211_stop_sched_scan(rdev, false);
1067                 }
1068
1069                 rdev->opencount--;
1070                 wake_up(&rdev->dev_wait);
1071                 break;
1072         case NETDEV_UP:
1073                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1074                 wdev_lock(wdev);
1075                 switch (wdev->iftype) {
1076 #ifdef CONFIG_CFG80211_WEXT
1077                 case NL80211_IFTYPE_ADHOC:
1078                         cfg80211_ibss_wext_join(rdev, wdev);
1079                         break;
1080                 case NL80211_IFTYPE_STATION:
1081                         cfg80211_mgd_wext_connect(rdev, wdev);
1082                         break;
1083 #endif
1084 #ifdef CONFIG_MAC80211_MESH
1085                 case NL80211_IFTYPE_MESH_POINT:
1086                         {
1087                                 /* backward compat code... */
1088                                 struct mesh_setup setup;
1089                                 memcpy(&setup, &default_mesh_setup,
1090                                                 sizeof(setup));
1091                                  /* back compat only needed for mesh_id */
1092                                 setup.mesh_id = wdev->ssid;
1093                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1094                                 if (wdev->mesh_id_up_len)
1095                                         __cfg80211_join_mesh(rdev, dev,
1096                                                         &setup,
1097                                                         &default_mesh_config);
1098                                 break;
1099                         }
1100 #endif
1101                 default:
1102                         break;
1103                 }
1104                 wdev_unlock(wdev);
1105                 rdev->opencount++;
1106
1107                 /*
1108                  * Configure power management to the driver here so that its
1109                  * correctly set also after interface type changes etc.
1110                  */
1111                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1112                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1113                     rdev->ops->set_power_mgmt)
1114                         if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
1115                                                 wdev->ps_timeout)) {
1116                                 /* assume this means it's off */
1117                                 wdev->ps = false;
1118                         }
1119                 break;
1120         case NETDEV_UNREGISTER:
1121                 /*
1122                  * It is possible to get NETDEV_UNREGISTER
1123                  * multiple times. To detect that, check
1124                  * that the interface is still on the list
1125                  * of registered interfaces, and only then
1126                  * remove and clean it up.
1127                  */
1128                 if (!list_empty(&wdev->list)) {
1129                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1130                         list_del_rcu(&wdev->list);
1131                         rdev->devlist_generation++;
1132                         cfg80211_mlme_purge_registrations(wdev);
1133 #ifdef CONFIG_CFG80211_WEXT
1134                         kzfree(wdev->wext.keys);
1135 #endif
1136                 }
1137                 /*
1138                  * synchronise (so that we won't find this netdev
1139                  * from other code any more) and then clear the list
1140                  * head so that the above code can safely check for
1141                  * !list_empty() to avoid double-cleanup.
1142                  */
1143                 synchronize_rcu();
1144                 INIT_LIST_HEAD(&wdev->list);
1145                 /*
1146                  * Ensure that all events have been processed and
1147                  * freed.
1148                  */
1149                 cfg80211_process_wdev_events(wdev);
1150
1151                 if (WARN_ON(wdev->current_bss)) {
1152                         cfg80211_unhold_bss(wdev->current_bss);
1153                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1154                         wdev->current_bss = NULL;
1155                 }
1156                 break;
1157         case NETDEV_PRE_UP:
1158                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1159                         return notifier_from_errno(-EOPNOTSUPP);
1160                 if (rfkill_blocked(rdev->rfkill))
1161                         return notifier_from_errno(-ERFKILL);
1162                 break;
1163         default:
1164                 return NOTIFY_DONE;
1165         }
1166
1167         wireless_nlevent_flush();
1168
1169         return NOTIFY_OK;
1170 }
1171
1172 static struct notifier_block cfg80211_netdev_notifier = {
1173         .notifier_call = cfg80211_netdev_notifier_call,
1174 };
1175
1176 static void __net_exit cfg80211_pernet_exit(struct net *net)
1177 {
1178         struct cfg80211_registered_device *rdev;
1179
1180         rtnl_lock();
1181         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1182                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1183                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1184         }
1185         rtnl_unlock();
1186 }
1187
1188 static struct pernet_operations cfg80211_pernet_ops = {
1189         .exit = cfg80211_pernet_exit,
1190 };
1191
1192 static int __init cfg80211_init(void)
1193 {
1194         int err;
1195
1196         err = register_pernet_device(&cfg80211_pernet_ops);
1197         if (err)
1198                 goto out_fail_pernet;
1199
1200         err = wiphy_sysfs_init();
1201         if (err)
1202                 goto out_fail_sysfs;
1203
1204         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1205         if (err)
1206                 goto out_fail_notifier;
1207
1208         err = nl80211_init();
1209         if (err)
1210                 goto out_fail_nl80211;
1211
1212         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1213
1214         err = regulatory_init();
1215         if (err)
1216                 goto out_fail_reg;
1217
1218         cfg80211_wq = create_singlethread_workqueue("cfg80211");
1219         if (!cfg80211_wq) {
1220                 err = -ENOMEM;
1221                 goto out_fail_wq;
1222         }
1223
1224         return 0;
1225
1226 out_fail_wq:
1227         regulatory_exit();
1228 out_fail_reg:
1229         debugfs_remove(ieee80211_debugfs_dir);
1230         nl80211_exit();
1231 out_fail_nl80211:
1232         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1233 out_fail_notifier:
1234         wiphy_sysfs_exit();
1235 out_fail_sysfs:
1236         unregister_pernet_device(&cfg80211_pernet_ops);
1237 out_fail_pernet:
1238         return err;
1239 }
1240 subsys_initcall(cfg80211_init);
1241
1242 static void __exit cfg80211_exit(void)
1243 {
1244         debugfs_remove(ieee80211_debugfs_dir);
1245         nl80211_exit();
1246         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1247         wiphy_sysfs_exit();
1248         regulatory_exit();
1249         unregister_pernet_device(&cfg80211_pernet_ops);
1250         destroy_workqueue(cfg80211_wq);
1251 }
1252 module_exit(cfg80211_exit);