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  * Copyright 2015       Intel Deutschland GmbH
   7  */
   8
   9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  10
  11 #include <linux/if.h>
  12 #include <linux/module.h>
  13 #include <linux/err.h>
  14 #include <linux/list.h>
  15 #include <linux/slab.h>
  16 #include <linux/nl80211.h>
  17 #include <linux/debugfs.h>
  18 #include <linux/notifier.h>
  19 #include <linux/device.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/sched.h>
  23 #include <net/genetlink.h>
  24 #include <net/cfg80211.h>
  25 #include "nl80211.h"
  26 #include "core.h"
  27 #include "sysfs.h"
  28 #include "debugfs.h"
  29 #include "wext-compat.h"
  30 #include "rdev-ops.h"
  31
  32 /* name for sysfs, %d is appended */
  33 #define PHY_NAME "phy"
  34
  35 MODULE_AUTHOR("Johannes Berg");
  36 MODULE_LICENSE("GPL");
  37 MODULE_DESCRIPTION("wireless configuration support");
  38 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
  39
  40 /* RCU-protected (and RTNL for writers) */
  41 LIST_HEAD(cfg80211_rdev_list);
  42 int cfg80211_rdev_list_generation;
  43
  44 /* for debugfs */
  45 static struct dentry *ieee80211_debugfs_dir;
  46
  47 /* for the cleanup, scan and event works */
  48 struct workqueue_struct *cfg80211_wq;
  49
  50 static bool cfg80211_disable_40mhz_24ghz;
  51 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  52 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  53                  "Disable 40MHz support in the 2.4GHz band");
  54
  55 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  56 {
  57         struct cfg80211_registered_device *result = NULL, *rdev;
  58
  59         ASSERT_RTNL();
  60
  61         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  62                 if (rdev->wiphy_idx == wiphy_idx) {
  63                         result = rdev;
  64                         break;
  65                 }
  66         }
  67
  68         return result;
  69 }
  70
  71 int get_wiphy_idx(struct wiphy *wiphy)
  72 {
  73         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
  74
  75         return rdev->wiphy_idx;
  76 }
  77
  78 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  79 {
  80         struct cfg80211_registered_device *rdev;
  81
  82         ASSERT_RTNL();
  83
  84         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  85         if (!rdev)
  86                 return NULL;
  87         return &rdev->wiphy;
  88 }
  89
  90 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
  91                                    const char *newname)
  92 {
  93         struct cfg80211_registered_device *rdev2;
  94         int wiphy_idx, taken = -1, digits;
  95
  96         ASSERT_RTNL();
  97
  98         /* prohibit calling the thing phy%d when %d is not its number */
  99         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 100         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 101                 /* count number of places needed to print wiphy_idx */
 102                 digits = 1;
 103                 while (wiphy_idx /= 10)
 104                         digits++;
 105                 /*
 106                  * deny the name if it is phy<idx> where <idx> is printed
 107                  * without leading zeroes. taken == strlen(newname) here
 108                  */
 109                 if (taken == strlen(PHY_NAME) + digits)
 110                         return -EINVAL;
 111         }
 112
 113         /* Ensure another device does not already have this name. */
 114         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 115                 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
 116                         return -EINVAL;
 117
 118         return 0;
 119 }
 120
 121 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 122                         char *newname)
 123 {
 124         int result;
 125
 126         ASSERT_RTNL();
 127
 128         /* Ignore nop renames */
 129         if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
 130                 return 0;
 131
 132         result = cfg80211_dev_check_name(rdev, newname);
 133         if (result < 0)
 134                 return result;
 135
 136         result = device_rename(&rdev->wiphy.dev, newname);
 137         if (result)
 138                 return result;
 139
 140         if (rdev->wiphy.debugfsdir &&
 141             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 142                             rdev->wiphy.debugfsdir,
 143                             rdev->wiphy.debugfsdir->d_parent,
 144                             newname))
 145                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 146
 147         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 148
 149         return 0;
 150 }
 151
 152 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 153                           struct net *net)
 154 {
 155         struct wireless_dev *wdev;
 156         int err = 0;
 157
 158         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 159                 return -EOPNOTSUPP;
 160
 161         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 162                 if (!wdev->netdev)
 163                         continue;
 164                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 165                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 166                 if (err)
 167                         break;
 168                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 169         }
 170
 171         if (err) {
 172                 /* failed -- clean up to old netns */
 173                 net = wiphy_net(&rdev->wiphy);
 174
 175                 list_for_each_entry_continue_reverse(wdev,
 176                                                      &rdev->wiphy.wdev_list,
 177                                                      list) {
 178                         if (!wdev->netdev)
 179                                 continue;
 180                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 181                         err = dev_change_net_namespace(wdev->netdev, net,
 182                                                         "wlan%d");
 183                         WARN_ON(err);
 184                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 185                 }
 186
 187                 return err;
 188         }
 189
 190         wiphy_net_set(&rdev->wiphy, net);
 191
 192         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 193         WARN_ON(err);
 194
 195         return 0;
 196 }
 197
 198 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 199 {
 200         struct cfg80211_registered_device *rdev = data;
 201
 202         rdev_rfkill_poll(rdev);
 203 }
 204
 205 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 206                               struct wireless_dev *wdev)
 207 {
 208         ASSERT_RTNL();
 209
 210         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 211                 return;
 212
 213         if (!wdev->p2p_started)
 214                 return;
 215
 216         rdev_stop_p2p_device(rdev, wdev);
 217         wdev->p2p_started = false;
 218
 219         rdev->opencount--;
 220
 221         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 222                 if (WARN_ON(!rdev->scan_req->notified))
 223                         rdev->scan_req->aborted = true;
 224                 ___cfg80211_scan_done(rdev, false);
 225         }
 226 }
 227
 228 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 229 {
 230         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 231         struct wireless_dev *wdev;
 232
 233         ASSERT_RTNL();
 234
 235         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 236                 if (wdev->netdev) {
 237                         dev_close(wdev->netdev);
 238                         continue;
 239                 }
 240                 /* otherwise, check iftype */
 241                 switch (wdev->iftype) {
 242                 case NL80211_IFTYPE_P2P_DEVICE:
 243                         cfg80211_stop_p2p_device(rdev, wdev);
 244                         break;
 245                 default:
 246                         break;
 247                 }
 248         }
 249 }
 250 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 251
 252 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 253 {
 254         struct cfg80211_registered_device *rdev = data;
 255
 256         if (!blocked)
 257                 return 0;
 258
 259         rtnl_lock();
 260         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 261         rtnl_unlock();
 262
 263         return 0;
 264 }
 265
 266 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 267 {
 268         struct cfg80211_registered_device *rdev;
 269
 270         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 271         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 272 }
 273
 274 static void cfg80211_event_work(struct work_struct *work)
 275 {
 276         struct cfg80211_registered_device *rdev;
 277
 278         rdev = container_of(work, struct cfg80211_registered_device,
 279                             event_work);
 280
 281         rtnl_lock();
 282         cfg80211_process_rdev_events(rdev);
 283         rtnl_unlock();
 284 }
 285
 286 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 287 {
 288         struct cfg80211_iface_destroy *item;
 289
 290         ASSERT_RTNL();
 291
 292         spin_lock_irq(&rdev->destroy_list_lock);
 293         while ((item = list_first_entry_or_null(&rdev->destroy_list,
 294                                                 struct cfg80211_iface_destroy,
 295                                                 list))) {
 296                 struct wireless_dev *wdev, *tmp;
 297                 u32 nlportid = item->nlportid;
 298
 299                 list_del(&item->list);
 300                 kfree(item);
 301                 spin_unlock_irq(&rdev->destroy_list_lock);
 302
 303                 list_for_each_entry_safe(wdev, tmp,
 304                                          &rdev->wiphy.wdev_list, list) {
 305                         if (nlportid == wdev->owner_nlportid)
 306                                 rdev_del_virtual_intf(rdev, wdev);
 307                 }
 308
 309                 spin_lock_irq(&rdev->destroy_list_lock);
 310         }
 311         spin_unlock_irq(&rdev->destroy_list_lock);
 312 }
 313
 314 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 315 {
 316         struct cfg80211_registered_device *rdev;
 317
 318         rdev = container_of(work, struct cfg80211_registered_device,
 319                             destroy_work);
 320
 321         rtnl_lock();
 322         cfg80211_destroy_ifaces(rdev);
 323         rtnl_unlock();
 324 }
 325
 326 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
 327 {
 328         struct cfg80211_registered_device *rdev;
 329
 330         rdev = container_of(work, struct cfg80211_registered_device,
 331                            sched_scan_stop_wk);
 332
 333         rtnl_lock();
 334
 335         __cfg80211_stop_sched_scan(rdev, false);
 336
 337         rtnl_unlock();
 338 }
 339
 340 /* exported functions */
 341
 342 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 343                            const char *requested_name)
 344 {
 345         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 346
 347         struct cfg80211_registered_device *rdev;
 348         int alloc_size;
 349
 350         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 351         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 352         WARN_ON(ops->connect && !ops->disconnect);
 353         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 354         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 355         WARN_ON(ops->add_station && !ops->del_station);
 356         WARN_ON(ops->add_mpath && !ops->del_mpath);
 357         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 358         WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
 359         WARN_ON(ops->start_ap && !ops->stop_ap);
 360         WARN_ON(ops->join_ocb && !ops->leave_ocb);
 361         WARN_ON(ops->suspend && !ops->resume);
 362         WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
 363         WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
 364         WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
 365         WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
 366         WARN_ON(ops->set_tx_power && !ops->get_tx_power);
 367         WARN_ON(ops->set_antenna && !ops->get_antenna);
 368
 369         alloc_size = sizeof(*rdev) + sizeof_priv;
 370
 371         rdev = kzalloc(alloc_size, GFP_KERNEL);
 372         if (!rdev)
 373                 return NULL;
 374
 375         rdev->ops = ops;
 376
 377         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 378
 379         if (unlikely(rdev->wiphy_idx < 0)) {
 380                 /* ugh, wrapped! */
 381                 atomic_dec(&wiphy_counter);
 382                 kfree(rdev);
 383                 return NULL;
 384         }
 385
 386         /* atomic_inc_return makes it start at 1, make it start at 0 */
 387         rdev->wiphy_idx--;
 388
 389         /* give it a proper name */
 390         if (requested_name && requested_name[0]) {
 391                 int rv;
 392
 393                 rtnl_lock();
 394                 rv = cfg80211_dev_check_name(rdev, requested_name);
 395
 396                 if (rv < 0) {
 397                         rtnl_unlock();
 398                         goto use_default_name;
 399                 }
 400
 401                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 402                 rtnl_unlock();
 403                 if (rv)
 404                         goto use_default_name;
 405         } else {
 406 use_default_name:
 407                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 408                  * the restrictions on phy names.  Probably this call could
 409                  * fail if some other part of the kernel (re)named a device
 410                  * phyX.  But, might should add some locking and check return
 411                  * value, and use a different name if this one exists?
 412                  */
 413                 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 414         }
 415
 416         INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
 417         INIT_LIST_HEAD(&rdev->beacon_registrations);
 418         spin_lock_init(&rdev->beacon_registrations_lock);
 419         spin_lock_init(&rdev->bss_lock);
 420         INIT_LIST_HEAD(&rdev->bss_list);
 421         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 422         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 423         INIT_LIST_HEAD(&rdev->mlme_unreg);
 424         spin_lock_init(&rdev->mlme_unreg_lock);
 425         INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
 426         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 427                           cfg80211_dfs_channels_update_work);
 428 #ifdef CONFIG_CFG80211_WEXT
 429         rdev->wiphy.wext = &cfg80211_wext_handler;
 430 #endif
 431
 432         device_initialize(&rdev->wiphy.dev);
 433         rdev->wiphy.dev.class = &ieee80211_class;
 434         rdev->wiphy.dev.platform_data = rdev;
 435         device_enable_async_suspend(&rdev->wiphy.dev);
 436
 437         INIT_LIST_HEAD(&rdev->destroy_list);
 438         spin_lock_init(&rdev->destroy_list_lock);
 439         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 440         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 441
 442 #ifdef CONFIG_CFG80211_DEFAULT_PS
 443         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 444 #endif
 445
 446         wiphy_net_set(&rdev->wiphy, &init_net);
 447
 448         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 449         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 450                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 451                                    &rdev->rfkill_ops, rdev);
 452
 453         if (!rdev->rfkill) {
 454                 kfree(rdev);
 455                 return NULL;
 456         }
 457
 458         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 459         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 460         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 461
 462         init_waitqueue_head(&rdev->dev_wait);
 463
 464         /*
 465          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 466          * Fragmentation and RTS threshold are disabled by default with the
 467          * special -1 value.
 468          */
 469         rdev->wiphy.retry_short = 7;
 470         rdev->wiphy.retry_long = 4;
 471         rdev->wiphy.frag_threshold = (u32) -1;
 472         rdev->wiphy.rts_threshold = (u32) -1;
 473         rdev->wiphy.coverage_class = 0;
 474
 475         rdev->wiphy.max_num_csa_counters = 1;
 476
 477         rdev->wiphy.max_sched_scan_plans = 1;
 478         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 479
 480         return &rdev->wiphy;
 481 }
 482 EXPORT_SYMBOL(wiphy_new_nm);
 483
 484 static int wiphy_verify_combinations(struct wiphy *wiphy)
 485 {
 486         const struct ieee80211_iface_combination *c;
 487         int i, j;
 488
 489         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 490                 u32 cnt = 0;
 491                 u16 all_iftypes = 0;
 492
 493                 c = &wiphy->iface_combinations[i];
 494
 495                 /*
 496                  * Combinations with just one interface aren't real,
 497                  * however we make an exception for DFS.
 498                  */
 499                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 500                         return -EINVAL;
 501
 502                 /* Need at least one channel */
 503                 if (WARN_ON(!c->num_different_channels))
 504                         return -EINVAL;
 505
 506                 /*
 507                  * Put a sane limit on maximum number of different
 508                  * channels to simplify channel accounting code.
 509                  */
 510                 if (WARN_ON(c->num_different_channels >
 511                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 512                         return -EINVAL;
 513
 514                 /* DFS only works on one channel. */
 515                 if (WARN_ON(c->radar_detect_widths &&
 516                             (c->num_different_channels > 1)))
 517                         return -EINVAL;
 518
 519                 if (WARN_ON(!c->n_limits))
 520                         return -EINVAL;
 521
 522                 for (j = 0; j < c->n_limits; j++) {
 523                         u16 types = c->limits[j].types;
 524
 525                         /* interface types shouldn't overlap */
 526                         if (WARN_ON(types & all_iftypes))
 527                                 return -EINVAL;
 528                         all_iftypes |= types;
 529
 530                         if (WARN_ON(!c->limits[j].max))
 531                                 return -EINVAL;
 532
 533                         /* Shouldn't list software iftypes in combinations! */
 534                         if (WARN_ON(wiphy->software_iftypes & types))
 535                                 return -EINVAL;
 536
 537                         /* Only a single P2P_DEVICE can be allowed */
 538                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 539                                     c->limits[j].max > 1))
 540                                 return -EINVAL;
 541
 542                         cnt += c->limits[j].max;
 543                         /*
 544                          * Don't advertise an unsupported type
 545                          * in a combination.
 546                          */
 547                         if (WARN_ON((wiphy->interface_modes & types) != types))
 548                                 return -EINVAL;
 549                 }
 550
 551                 /* You can't even choose that many! */
 552                 if (WARN_ON(cnt < c->max_interfaces))
 553                         return -EINVAL;
 554         }
 555
 556         return 0;
 557 }
 558
 559 int wiphy_register(struct wiphy *wiphy)
 560 {
 561         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 562         int res;
 563         enum nl80211_band band;
 564         struct ieee80211_supported_band *sband;
 565         bool have_band = false;
 566         int i;
 567         u16 ifmodes = wiphy->interface_modes;
 568
 569 #ifdef CONFIG_PM
 570         if (WARN_ON(wiphy->wowlan &&
 571                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 572                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 573                 return -EINVAL;
 574         if (WARN_ON(wiphy->wowlan &&
 575                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 576                     !wiphy->wowlan->tcp))
 577                 return -EINVAL;
 578 #endif
 579         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 580                     (!rdev->ops->tdls_channel_switch ||
 581                      !rdev->ops->tdls_cancel_channel_switch)))
 582                 return -EINVAL;
 583
 584         /*
 585          * if a wiphy has unsupported modes for regulatory channel enforcement,
 586          * opt-out of enforcement checking
 587          */
 588         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 589                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 590                                        BIT(NL80211_IFTYPE_AP) |
 591                                        BIT(NL80211_IFTYPE_P2P_GO) |
 592                                        BIT(NL80211_IFTYPE_ADHOC) |
 593                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 594                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 595                                        BIT(NL80211_IFTYPE_MONITOR)))
 596                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 597
 598         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 599                     (wiphy->regulatory_flags &
 600                                         (REGULATORY_CUSTOM_REG |
 601                                          REGULATORY_STRICT_REG |
 602                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 603                                          REGULATORY_COUNTRY_IE_IGNORE))))
 604                 return -EINVAL;
 605
 606         if (WARN_ON(wiphy->coalesce &&
 607                     (!wiphy->coalesce->n_rules ||
 608                      !wiphy->coalesce->n_patterns) &&
 609                     (!wiphy->coalesce->pattern_min_len ||
 610                      wiphy->coalesce->pattern_min_len >
 611                         wiphy->coalesce->pattern_max_len)))
 612                 return -EINVAL;
 613
 614         if (WARN_ON(wiphy->ap_sme_capa &&
 615                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 616                 return -EINVAL;
 617
 618         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 619                 return -EINVAL;
 620
 621         if (WARN_ON(wiphy->addresses &&
 622                     !is_zero_ether_addr(wiphy->perm_addr) &&
 623                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 624                            ETH_ALEN)))
 625                 return -EINVAL;
 626
 627         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 628                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 629                      !rdev->ops->set_mac_acl)))
 630                 return -EINVAL;
 631
 632         /* assure only valid behaviours are flagged by driver
 633          * hence subtract 2 as bit 0 is invalid.
 634          */
 635         if (WARN_ON(wiphy->bss_select_support &&
 636                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 637                 return -EINVAL;
 638
 639         if (wiphy->addresses)
 640                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 641
 642         /* sanity check ifmodes */
 643         WARN_ON(!ifmodes);
 644         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 645         if (WARN_ON(ifmodes != wiphy->interface_modes))
 646                 wiphy->interface_modes = ifmodes;
 647
 648         res = wiphy_verify_combinations(wiphy);
 649         if (res)
 650                 return res;
 651
 652         /* sanity check supported bands/channels */
 653         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 654                 sband = wiphy->bands[band];
 655                 if (!sband)
 656                         continue;
 657
 658                 sband->band = band;
 659                 if (WARN_ON(!sband->n_channels))
 660                         return -EINVAL;
 661                 /*
 662                  * on 60GHz band, there are no legacy rates, so
 663                  * n_bitrates is 0
 664                  */
 665                 if (WARN_ON(band != NL80211_BAND_60GHZ &&
 666                             !sband->n_bitrates))
 667                         return -EINVAL;
 668
 669                 /*
 670                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 671                  * modify the sband's ht data even if the driver uses a
 672                  * global structure for that.
 673                  */
 674                 if (cfg80211_disable_40mhz_24ghz &&
 675                     band == NL80211_BAND_2GHZ &&
 676                     sband->ht_cap.ht_supported) {
 677                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 678                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 679                 }
 680
 681                 /*
 682                  * Since we use a u32 for rate bitmaps in
 683                  * ieee80211_get_response_rate, we cannot
 684                  * have more than 32 legacy rates.
 685                  */
 686                 if (WARN_ON(sband->n_bitrates > 32))
 687                         return -EINVAL;
 688
 689                 for (i = 0; i < sband->n_channels; i++) {
 690                         sband->channels[i].orig_flags =
 691                                 sband->channels[i].flags;
 692                         sband->channels[i].orig_mag = INT_MAX;
 693                         sband->channels[i].orig_mpwr =
 694                                 sband->channels[i].max_power;
 695                         sband->channels[i].band = band;
 696                 }
 697
 698                 have_band = true;
 699         }
 700
 701         if (!have_band) {
 702                 WARN_ON(1);
 703                 return -EINVAL;
 704         }
 705
 706 #ifdef CONFIG_PM
 707         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 708                     (!rdev->wiphy.wowlan->pattern_min_len ||
 709                      rdev->wiphy.wowlan->pattern_min_len >
 710                                 rdev->wiphy.wowlan->pattern_max_len)))
 711                 return -EINVAL;
 712 #endif
 713
 714         /* check and set up bitrates */
 715         ieee80211_set_bitrate_flags(wiphy);
 716
 717         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 718
 719         rtnl_lock();
 720         res = device_add(&rdev->wiphy.dev);
 721         if (res) {
 722                 rtnl_unlock();
 723                 return res;
 724         }
 725
 726         /* set up regulatory info */
 727         wiphy_regulatory_register(wiphy);
 728
 729         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 730         cfg80211_rdev_list_generation++;
 731
 732         /* add to debugfs */
 733         rdev->wiphy.debugfsdir =
 734                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 735                                    ieee80211_debugfs_dir);
 736         if (IS_ERR(rdev->wiphy.debugfsdir))
 737                 rdev->wiphy.debugfsdir = NULL;
 738
 739         cfg80211_debugfs_rdev_add(rdev);
 740         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 741
 742         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 743                 struct regulatory_request request;
 744
 745                 request.wiphy_idx = get_wiphy_idx(wiphy);
 746                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 747                 request.alpha2[0] = '9';
 748                 request.alpha2[1] = '9';
 749
 750                 nl80211_send_reg_change_event(&request);
 751         }
 752
 753         rdev->wiphy.registered = true;
 754         rtnl_unlock();
 755
 756         res = rfkill_register(rdev->rfkill);
 757         if (res) {
 758                 rfkill_destroy(rdev->rfkill);
 759                 rdev->rfkill = NULL;
 760                 wiphy_unregister(&rdev->wiphy);
 761                 return res;
 762         }
 763
 764         return 0;
 765 }
 766 EXPORT_SYMBOL(wiphy_register);
 767
 768 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 769 {
 770         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 771
 772         if (!rdev->ops->rfkill_poll)
 773                 return;
 774         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 775         rfkill_resume_polling(rdev->rfkill);
 776 }
 777 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 778
 779 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 780 {
 781         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 782
 783         rfkill_pause_polling(rdev->rfkill);
 784 }
 785 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 786
 787 void wiphy_unregister(struct wiphy *wiphy)
 788 {
 789         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 790
 791         wait_event(rdev->dev_wait, ({
 792                 int __count;
 793                 rtnl_lock();
 794                 __count = rdev->opencount;
 795                 rtnl_unlock();
 796                 __count == 0; }));
 797
 798         if (rdev->rfkill)
 799                 rfkill_unregister(rdev->rfkill);
 800
 801         rtnl_lock();
 802         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 803         rdev->wiphy.registered = false;
 804
 805         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
 806
 807         /*
 808          * First remove the hardware from everywhere, this makes
 809          * it impossible to find from userspace.
 810          */
 811         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 812         list_del_rcu(&rdev->list);
 813         synchronize_rcu();
 814
 815         /*
 816          * If this device got a regulatory hint tell core its
 817          * free to listen now to a new shiny device regulatory hint
 818          */
 819         wiphy_regulatory_deregister(wiphy);
 820
 821         cfg80211_rdev_list_generation++;
 822         device_del(&rdev->wiphy.dev);
 823
 824         rtnl_unlock();
 825
 826         flush_work(&rdev->scan_done_wk);
 827         cancel_work_sync(&rdev->conn_work);
 828         flush_work(&rdev->event_work);
 829         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 830         flush_work(&rdev->destroy_work);
 831         flush_work(&rdev->sched_scan_stop_wk);
 832         flush_work(&rdev->mlme_unreg_wk);
 833
 834 #ifdef CONFIG_PM
 835         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
 836                 rdev_set_wakeup(rdev, false);
 837 #endif
 838         cfg80211_rdev_free_wowlan(rdev);
 839         cfg80211_rdev_free_coalesce(rdev);
 840 }
 841 EXPORT_SYMBOL(wiphy_unregister);
 842
 843 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 844 {
 845         struct cfg80211_internal_bss *scan, *tmp;
 846         struct cfg80211_beacon_registration *reg, *treg;
 847         rfkill_destroy(rdev->rfkill);
 848         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 849                 list_del(&reg->list);
 850                 kfree(reg);
 851         }
 852         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 853                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 854         kfree(rdev);
 855 }
 856
 857 void wiphy_free(struct wiphy *wiphy)
 858 {
 859         put_device(&wiphy->dev);
 860 }
 861 EXPORT_SYMBOL(wiphy_free);
 862
 863 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 864 {
 865         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 866
 867         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 868                 schedule_work(&rdev->rfkill_sync);
 869 }
 870 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 871
 872 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 873 {
 874         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 875
 876         ASSERT_RTNL();
 877
 878         if (WARN_ON(wdev->netdev))
 879                 return;
 880
 881         list_del_rcu(&wdev->list);
 882         rdev->devlist_generation++;
 883
 884         switch (wdev->iftype) {
 885         case NL80211_IFTYPE_P2P_DEVICE:
 886                 cfg80211_mlme_purge_registrations(wdev);
 887                 cfg80211_stop_p2p_device(rdev, wdev);
 888                 break;
 889         default:
 890                 WARN_ON_ONCE(1);
 891                 break;
 892         }
 893 }
 894 EXPORT_SYMBOL(cfg80211_unregister_wdev);
 895
 896 static const struct device_type wiphy_type = {
 897         .name   = "wlan",
 898 };
 899
 900 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 901                                enum nl80211_iftype iftype, int num)
 902 {
 903         ASSERT_RTNL();
 904
 905         rdev->num_running_ifaces += num;
 906         if (iftype == NL80211_IFTYPE_MONITOR)
 907                 rdev->num_running_monitor_ifaces += num;
 908 }
 909
 910 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
 911                       struct wireless_dev *wdev)
 912 {
 913         struct net_device *dev = wdev->netdev;
 914         struct cfg80211_sched_scan_request *sched_scan_req;
 915
 916         ASSERT_RTNL();
 917         ASSERT_WDEV_LOCK(wdev);
 918
 919         switch (wdev->iftype) {
 920         case NL80211_IFTYPE_ADHOC:
 921                 __cfg80211_leave_ibss(rdev, dev, true);
 922                 break;
 923         case NL80211_IFTYPE_P2P_CLIENT:
 924         case NL80211_IFTYPE_STATION:
 925                 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
 926                 if (sched_scan_req && dev == sched_scan_req->dev)
 927                         __cfg80211_stop_sched_scan(rdev, false);
 928
 929 #ifdef CONFIG_CFG80211_WEXT
 930                 kfree(wdev->wext.ie);
 931                 wdev->wext.ie = NULL;
 932                 wdev->wext.ie_len = 0;
 933                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 934 #endif
 935                 cfg80211_disconnect(rdev, dev,
 936                                     WLAN_REASON_DEAUTH_LEAVING, true);
 937                 break;
 938         case NL80211_IFTYPE_MESH_POINT:
 939                 __cfg80211_leave_mesh(rdev, dev);
 940                 break;
 941         case NL80211_IFTYPE_AP:
 942         case NL80211_IFTYPE_P2P_GO:
 943                 __cfg80211_stop_ap(rdev, dev, true);
 944                 break;
 945         case NL80211_IFTYPE_OCB:
 946                 __cfg80211_leave_ocb(rdev, dev);
 947                 break;
 948         case NL80211_IFTYPE_WDS:
 949                 /* must be handled by mac80211/driver, has no APIs */
 950                 break;
 951         case NL80211_IFTYPE_P2P_DEVICE:
 952                 /* cannot happen, has no netdev */
 953                 break;
 954         case NL80211_IFTYPE_AP_VLAN:
 955         case NL80211_IFTYPE_MONITOR:
 956                 /* nothing to do */
 957                 break;
 958         case NL80211_IFTYPE_UNSPECIFIED:
 959         case NUM_NL80211_IFTYPES:
 960                 /* invalid */
 961                 break;
 962         }
 963 }
 964
 965 void cfg80211_leave(struct cfg80211_registered_device *rdev,
 966                     struct wireless_dev *wdev)
 967 {
 968         wdev_lock(wdev);
 969         __cfg80211_leave(rdev, wdev);
 970         wdev_unlock(wdev);
 971 }
 972
 973 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
 974                          gfp_t gfp)
 975 {
 976         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 977         struct cfg80211_event *ev;
 978         unsigned long flags;
 979
 980         trace_cfg80211_stop_iface(wiphy, wdev);
 981
 982         ev = kzalloc(sizeof(*ev), gfp);
 983         if (!ev)
 984                 return;
 985
 986         ev->type = EVENT_STOPPED;
 987
 988         spin_lock_irqsave(&wdev->event_lock, flags);
 989         list_add_tail(&ev->list, &wdev->event_list);
 990         spin_unlock_irqrestore(&wdev->event_lock, flags);
 991         queue_work(cfg80211_wq, &rdev->event_work);
 992 }
 993 EXPORT_SYMBOL(cfg80211_stop_iface);
 994
 995 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 996                                          unsigned long state, void *ptr)
 997 {
 998         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 999         struct wireless_dev *wdev = dev->ieee80211_ptr;
1000         struct cfg80211_registered_device *rdev;
1001         struct cfg80211_sched_scan_request *sched_scan_req;
1002
1003         if (!wdev)
1004                 return NOTIFY_DONE;
1005
1006         rdev = wiphy_to_rdev(wdev->wiphy);
1007
1008         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1009
1010         switch (state) {
1011         case NETDEV_POST_INIT:
1012                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1013                 break;
1014         case NETDEV_REGISTER:
1015                 /*
1016                  * NB: cannot take rdev->mtx here because this may be
1017                  * called within code protected by it when interfaces
1018                  * are added with nl80211.
1019                  */
1020                 mutex_init(&wdev->mtx);
1021                 INIT_LIST_HEAD(&wdev->event_list);
1022                 spin_lock_init(&wdev->event_lock);
1023                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1024                 spin_lock_init(&wdev->mgmt_registrations_lock);
1025
1026                 wdev->identifier = ++rdev->wdev_id;
1027                 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1028                 rdev->devlist_generation++;
1029                 /* can only change netns with wiphy */
1030                 dev->features |= NETIF_F_NETNS_LOCAL;
1031
1032                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1033                                       "phy80211")) {
1034                         pr_err("failed to add phy80211 symlink to netdev!\n");
1035                 }
1036                 wdev->netdev = dev;
1037 #ifdef CONFIG_CFG80211_WEXT
1038                 wdev->wext.default_key = -1;
1039                 wdev->wext.default_mgmt_key = -1;
1040                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1041 #endif
1042
1043                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1044                         wdev->ps = true;
1045                 else
1046                         wdev->ps = false;
1047                 /* allow mac80211 to determine the timeout */
1048                 wdev->ps_timeout = -1;
1049
1050                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1051                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1052                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1053                         dev->priv_flags |= IFF_DONT_BRIDGE;
1054                 break;
1055         case NETDEV_GOING_DOWN:
1056                 cfg80211_leave(rdev, wdev);
1057                 break;
1058         case NETDEV_DOWN:
1059                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1060                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1061                         if (WARN_ON(!rdev->scan_req->notified))
1062                                 rdev->scan_req->aborted = true;
1063                         ___cfg80211_scan_done(rdev, false);
1064                 }
1065
1066                 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1067                 if (WARN_ON(sched_scan_req &&
1068                             sched_scan_req->dev == wdev->netdev)) {
1069                         __cfg80211_stop_sched_scan(rdev, false);
1070                 }
1071
1072                 rdev->opencount--;
1073                 wake_up(&rdev->dev_wait);
1074                 break;
1075         case NETDEV_UP:
1076                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1077                 wdev_lock(wdev);
1078                 switch (wdev->iftype) {
1079 #ifdef CONFIG_CFG80211_WEXT
1080                 case NL80211_IFTYPE_ADHOC:
1081                         cfg80211_ibss_wext_join(rdev, wdev);
1082                         break;
1083                 case NL80211_IFTYPE_STATION:
1084                         cfg80211_mgd_wext_connect(rdev, wdev);
1085                         break;
1086 #endif
1087 #ifdef CONFIG_MAC80211_MESH
1088                 case NL80211_IFTYPE_MESH_POINT:
1089                         {
1090                                 /* backward compat code... */
1091                                 struct mesh_setup setup;
1092                                 memcpy(&setup, &default_mesh_setup,
1093                                                 sizeof(setup));
1094                                  /* back compat only needed for mesh_id */
1095                                 setup.mesh_id = wdev->ssid;
1096                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1097                                 if (wdev->mesh_id_up_len)
1098                                         __cfg80211_join_mesh(rdev, dev,
1099                                                         &setup,
1100                                                         &default_mesh_config);
1101                                 break;
1102                         }
1103 #endif
1104                 default:
1105                         break;
1106                 }
1107                 wdev_unlock(wdev);
1108                 rdev->opencount++;
1109
1110                 /*
1111                  * Configure power management to the driver here so that its
1112                  * correctly set also after interface type changes etc.
1113                  */
1114                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1115                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1116                     rdev->ops->set_power_mgmt)
1117                         if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
1118                                                 wdev->ps_timeout)) {
1119                                 /* assume this means it's off */
1120                                 wdev->ps = false;
1121                         }
1122                 break;
1123         case NETDEV_UNREGISTER:
1124                 /*
1125                  * It is possible to get NETDEV_UNREGISTER
1126                  * multiple times. To detect that, check
1127                  * that the interface is still on the list
1128                  * of registered interfaces, and only then
1129                  * remove and clean it up.
1130                  */
1131                 if (!list_empty(&wdev->list)) {
1132                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1133                         list_del_rcu(&wdev->list);
1134                         rdev->devlist_generation++;
1135                         cfg80211_mlme_purge_registrations(wdev);
1136 #ifdef CONFIG_CFG80211_WEXT
1137                         kzfree(wdev->wext.keys);
1138 #endif
1139                 }
1140                 /*
1141                  * synchronise (so that we won't find this netdev
1142                  * from other code any more) and then clear the list
1143                  * head so that the above code can safely check for
1144                  * !list_empty() to avoid double-cleanup.
1145                  */
1146                 synchronize_rcu();
1147                 INIT_LIST_HEAD(&wdev->list);
1148                 /*
1149                  * Ensure that all events have been processed and
1150                  * freed.
1151                  */
1152                 cfg80211_process_wdev_events(wdev);
1153
1154                 if (WARN_ON(wdev->current_bss)) {
1155                         cfg80211_unhold_bss(wdev->current_bss);
1156                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1157                         wdev->current_bss = NULL;
1158                 }
1159                 break;
1160         case NETDEV_PRE_UP:
1161                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1162                         return notifier_from_errno(-EOPNOTSUPP);
1163                 if (rfkill_blocked(rdev->rfkill))
1164                         return notifier_from_errno(-ERFKILL);
1165                 break;
1166         default:
1167                 return NOTIFY_DONE;
1168         }
1169
1170         wireless_nlevent_flush();
1171
1172         return NOTIFY_OK;
1173 }
1174
1175 static struct notifier_block cfg80211_netdev_notifier = {
1176         .notifier_call = cfg80211_netdev_notifier_call,
1177 };
1178
1179 static void __net_exit cfg80211_pernet_exit(struct net *net)
1180 {
1181         struct cfg80211_registered_device *rdev;
1182
1183         rtnl_lock();
1184         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1185                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1186                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1187         }
1188         rtnl_unlock();
1189 }
1190
1191 static struct pernet_operations cfg80211_pernet_ops = {
1192         .exit = cfg80211_pernet_exit,
1193 };
1194
1195 static int __init cfg80211_init(void)
1196 {
1197         int err;
1198
1199         err = register_pernet_device(&cfg80211_pernet_ops);
1200         if (err)
1201                 goto out_fail_pernet;
1202
1203         err = wiphy_sysfs_init();
1204         if (err)
1205                 goto out_fail_sysfs;
1206
1207         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1208         if (err)
1209                 goto out_fail_notifier;
1210
1211         err = nl80211_init();
1212         if (err)
1213                 goto out_fail_nl80211;
1214
1215         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1216
1217         err = regulatory_init();
1218         if (err)
1219                 goto out_fail_reg;
1220
1221         cfg80211_wq = create_singlethread_workqueue("cfg80211");
1222         if (!cfg80211_wq) {
1223                 err = -ENOMEM;
1224                 goto out_fail_wq;
1225         }
1226
1227         return 0;
1228
1229 out_fail_wq:
1230         regulatory_exit();
1231 out_fail_reg:
1232         debugfs_remove(ieee80211_debugfs_dir);
1233         nl80211_exit();
1234 out_fail_nl80211:
1235         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1236 out_fail_notifier:
1237         wiphy_sysfs_exit();
1238 out_fail_sysfs:
1239         unregister_pernet_device(&cfg80211_pernet_ops);
1240 out_fail_pernet:
1241         return err;
1242 }
1243 subsys_initcall(cfg80211_init);
1244
1245 static void __exit cfg80211_exit(void)
1246 {
1247         debugfs_remove(ieee80211_debugfs_dir);
1248         nl80211_exit();
1249         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1250         wiphy_sysfs_exit();
1251         regulatory_exit();
1252         unregister_pernet_device(&cfg80211_pernet_ops);
1253         destroy_workqueue(cfg80211_wq);
1254 }
1255 module_exit(cfg80211_exit);