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         if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
  98                 return -EINVAL;
  99
 100         /* prohibit calling the thing phy%d when %d is not its number */
 101         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 102         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 103                 /* count number of places needed to print wiphy_idx */
 104                 digits = 1;
 105                 while (wiphy_idx /= 10)
 106                         digits++;
 107                 /*
 108                  * deny the name if it is phy<idx> where <idx> is printed
 109                  * without leading zeroes. taken == strlen(newname) here
 110                  */
 111                 if (taken == strlen(PHY_NAME) + digits)
 112                         return -EINVAL;
 113         }
 114
 115         /* Ensure another device does not already have this name. */
 116         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 117                 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
 118                         return -EINVAL;
 119
 120         return 0;
 121 }
 122
 123 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 124                         char *newname)
 125 {
 126         int result;
 127
 128         ASSERT_RTNL();
 129
 130         /* Ignore nop renames */
 131         if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
 132                 return 0;
 133
 134         result = cfg80211_dev_check_name(rdev, newname);
 135         if (result < 0)
 136                 return result;
 137
 138         result = device_rename(&rdev->wiphy.dev, newname);
 139         if (result)
 140                 return result;
 141
 142         if (rdev->wiphy.debugfsdir &&
 143             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 144                             rdev->wiphy.debugfsdir,
 145                             rdev->wiphy.debugfsdir->d_parent,
 146                             newname))
 147                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 148
 149         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 150
 151         return 0;
 152 }
 153
 154 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 155                           struct net *net)
 156 {
 157         struct wireless_dev *wdev;
 158         int err = 0;
 159
 160         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 161                 return -EOPNOTSUPP;
 162
 163         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 164                 if (!wdev->netdev)
 165                         continue;
 166                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 167                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 168                 if (err)
 169                         break;
 170                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 171         }
 172
 173         if (err) {
 174                 /* failed -- clean up to old netns */
 175                 net = wiphy_net(&rdev->wiphy);
 176
 177                 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,
 178                                                      list) {
 179                         if (!wdev->netdev)
 180                                 continue;
 181                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 182                         err = dev_change_net_namespace(wdev->netdev, net,
 183                                                         "wlan%d");
 184                         WARN_ON(err);
 185                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 186                 }
 187
 188                 return err;
 189         }
 190
 191         wiphy_net_set(&rdev->wiphy, net);
 192
 193         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 194         WARN_ON(err);
 195
 196         return 0;
 197 }
 198
 199 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 200 {
 201         struct cfg80211_registered_device *rdev = data;
 202
 203         rdev_rfkill_poll(rdev);
 204 }
 205
 206 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 207                               struct wireless_dev *wdev)
 208 {
 209         ASSERT_RTNL();
 210
 211         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 212                 return;
 213
 214         if (!wdev->p2p_started)
 215                 return;
 216
 217         rdev_stop_p2p_device(rdev, wdev);
 218         wdev->p2p_started = false;
 219
 220         rdev->opencount--;
 221
 222         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 223                 if (WARN_ON(!rdev->scan_req->notified))
 224                         rdev->scan_req->aborted = true;
 225                 ___cfg80211_scan_done(rdev, false);
 226         }
 227 }
 228
 229 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 230 {
 231         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 232         struct wireless_dev *wdev;
 233
 234         ASSERT_RTNL();
 235
 236         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 237                 if (wdev->netdev) {
 238                         dev_close(wdev->netdev);
 239                         continue;
 240                 }
 241                 /* otherwise, check iftype */
 242                 switch (wdev->iftype) {
 243                 case NL80211_IFTYPE_P2P_DEVICE:
 244                         cfg80211_stop_p2p_device(rdev, wdev);
 245                         break;
 246                 default:
 247                         break;
 248                 }
 249         }
 250 }
 251 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 252
 253 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 254 {
 255         struct cfg80211_registered_device *rdev = data;
 256
 257         if (!blocked)
 258                 return 0;
 259
 260         rtnl_lock();
 261         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 262         rtnl_unlock();
 263
 264         return 0;
 265 }
 266
 267 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 268 {
 269         struct cfg80211_registered_device *rdev;
 270
 271         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 272         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 273 }
 274
 275 static void cfg80211_event_work(struct work_struct *work)
 276 {
 277         struct cfg80211_registered_device *rdev;
 278
 279         rdev = container_of(work, struct cfg80211_registered_device,
 280                             event_work);
 281
 282         rtnl_lock();
 283         cfg80211_process_rdev_events(rdev);
 284         rtnl_unlock();
 285 }
 286
 287 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 288 {
 289         struct cfg80211_iface_destroy *item;
 290
 291         ASSERT_RTNL();
 292
 293         spin_lock_irq(&rdev->destroy_list_lock);
 294         while ((item = list_first_entry_or_null(&rdev->destroy_list,
 295                                                 struct cfg80211_iface_destroy,
 296                                                 list))) {
 297                 struct wireless_dev *wdev, *tmp;
 298                 u32 nlportid = item->nlportid;
 299
 300                 list_del(&item->list);
 301                 kfree(item);
 302                 spin_unlock_irq(&rdev->destroy_list_lock);
 303
 304                 list_for_each_entry_safe(wdev, tmp, &rdev->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
 359         alloc_size = sizeof(*rdev) + sizeof_priv;
 360
 361         rdev = kzalloc(alloc_size, GFP_KERNEL);
 362         if (!rdev)
 363                 return NULL;
 364
 365         rdev->ops = ops;
 366
 367         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 368
 369         if (unlikely(rdev->wiphy_idx < 0)) {
 370                 /* ugh, wrapped! */
 371                 atomic_dec(&wiphy_counter);
 372                 kfree(rdev);
 373                 return NULL;
 374         }
 375
 376         /* atomic_inc_return makes it start at 1, make it start at 0 */
 377         rdev->wiphy_idx--;
 378
 379         /* give it a proper name */
 380         if (requested_name && requested_name[0]) {
 381                 int rv;
 382
 383                 rtnl_lock();
 384                 rv = cfg80211_dev_check_name(rdev, requested_name);
 385
 386                 if (rv < 0) {
 387                         rtnl_unlock();
 388                         goto use_default_name;
 389                 }
 390
 391                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 392                 rtnl_unlock();
 393                 if (rv)
 394                         goto use_default_name;
 395         } else {
 396                 int rv;
 397
 398 use_default_name:
 399                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 400                  * the restrictions on phy names.  Probably this call could
 401                  * fail if some other part of the kernel (re)named a device
 402                  * phyX.  But, might should add some locking and check return
 403                  * value, and use a different name if this one exists?
 404                  */
 405                 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 406                 if (rv < 0) {
 407                         kfree(rdev);
 408                         return NULL;
 409                 }
 410         }
 411
 412         INIT_LIST_HEAD(&rdev->wdev_list);
 413         INIT_LIST_HEAD(&rdev->beacon_registrations);
 414         spin_lock_init(&rdev->beacon_registrations_lock);
 415         spin_lock_init(&rdev->bss_lock);
 416         INIT_LIST_HEAD(&rdev->bss_list);
 417         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 418         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 419         INIT_LIST_HEAD(&rdev->mlme_unreg);
 420         spin_lock_init(&rdev->mlme_unreg_lock);
 421         INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
 422         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 423                           cfg80211_dfs_channels_update_work);
 424 #ifdef CONFIG_CFG80211_WEXT
 425         rdev->wiphy.wext = &cfg80211_wext_handler;
 426 #endif
 427
 428         device_initialize(&rdev->wiphy.dev);
 429         rdev->wiphy.dev.class = &ieee80211_class;
 430         rdev->wiphy.dev.platform_data = rdev;
 431         device_enable_async_suspend(&rdev->wiphy.dev);
 432
 433         INIT_LIST_HEAD(&rdev->destroy_list);
 434         spin_lock_init(&rdev->destroy_list_lock);
 435         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 436         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 437
 438 #ifdef CONFIG_CFG80211_DEFAULT_PS
 439         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 440 #endif
 441
 442         wiphy_net_set(&rdev->wiphy, &init_net);
 443
 444         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 445         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 446                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 447                                    &rdev->rfkill_ops, rdev);
 448
 449         if (!rdev->rfkill) {
 450                 wiphy_free(&rdev->wiphy);
 451                 return NULL;
 452         }
 453
 454         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 455         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 456         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 457
 458         init_waitqueue_head(&rdev->dev_wait);
 459
 460         /*
 461          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 462          * Fragmentation and RTS threshold are disabled by default with the
 463          * special -1 value.
 464          */
 465         rdev->wiphy.retry_short = 7;
 466         rdev->wiphy.retry_long = 4;
 467         rdev->wiphy.frag_threshold = (u32) -1;
 468         rdev->wiphy.rts_threshold = (u32) -1;
 469         rdev->wiphy.coverage_class = 0;
 470
 471         rdev->wiphy.max_num_csa_counters = 1;
 472
 473         rdev->wiphy.max_sched_scan_plans = 1;
 474         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 475
 476         return &rdev->wiphy;
 477 }
 478 EXPORT_SYMBOL(wiphy_new_nm);
 479
 480 static int wiphy_verify_combinations(struct wiphy *wiphy)
 481 {
 482         const struct ieee80211_iface_combination *c;
 483         int i, j;
 484
 485         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 486                 u32 cnt = 0;
 487                 u16 all_iftypes = 0;
 488
 489                 c = &wiphy->iface_combinations[i];
 490
 491                 /*
 492                  * Combinations with just one interface aren't real,
 493                  * however we make an exception for DFS.
 494                  */
 495                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 496                         return -EINVAL;
 497
 498                 /* Need at least one channel */
 499                 if (WARN_ON(!c->num_different_channels))
 500                         return -EINVAL;
 501
 502                 /*
 503                  * Put a sane limit on maximum number of different
 504                  * channels to simplify channel accounting code.
 505                  */
 506                 if (WARN_ON(c->num_different_channels >
 507                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 508                         return -EINVAL;
 509
 510                 /* DFS only works on one channel. */
 511                 if (WARN_ON(c->radar_detect_widths &&
 512                             (c->num_different_channels > 1)))
 513                         return -EINVAL;
 514
 515                 if (WARN_ON(!c->n_limits))
 516                         return -EINVAL;
 517
 518                 for (j = 0; j < c->n_limits; j++) {
 519                         u16 types = c->limits[j].types;
 520
 521                         /* interface types shouldn't overlap */
 522                         if (WARN_ON(types & all_iftypes))
 523                                 return -EINVAL;
 524                         all_iftypes |= types;
 525
 526                         if (WARN_ON(!c->limits[j].max))
 527                                 return -EINVAL;
 528
 529                         /* Shouldn't list software iftypes in combinations! */
 530                         if (WARN_ON(wiphy->software_iftypes & types))
 531                                 return -EINVAL;
 532
 533                         /* Only a single P2P_DEVICE can be allowed */
 534                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 535                                     c->limits[j].max > 1))
 536                                 return -EINVAL;
 537
 538                         cnt += c->limits[j].max;
 539                         /*
 540                          * Don't advertise an unsupported type
 541                          * in a combination.
 542                          */
 543                         if (WARN_ON((wiphy->interface_modes & types) != types))
 544                                 return -EINVAL;
 545                 }
 546
 547                 /* You can't even choose that many! */
 548                 if (WARN_ON(cnt < c->max_interfaces))
 549                         return -EINVAL;
 550         }
 551
 552         return 0;
 553 }
 554
 555 int wiphy_register(struct wiphy *wiphy)
 556 {
 557         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 558         int res;
 559         enum ieee80211_band band;
 560         struct ieee80211_supported_band *sband;
 561         bool have_band = false;
 562         int i;
 563         u16 ifmodes = wiphy->interface_modes;
 564
 565 #ifdef CONFIG_PM
 566         if (WARN_ON(wiphy->wowlan &&
 567                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 568                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 569                 return -EINVAL;
 570         if (WARN_ON(wiphy->wowlan &&
 571                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 572                     !wiphy->wowlan->tcp))
 573                 return -EINVAL;
 574 #endif
 575         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 576                     (!rdev->ops->tdls_channel_switch ||
 577                      !rdev->ops->tdls_cancel_channel_switch)))
 578                 return -EINVAL;
 579
 580         /*
 581          * if a wiphy has unsupported modes for regulatory channel enforcement,
 582          * opt-out of enforcement checking
 583          */
 584         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 585                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 586                                        BIT(NL80211_IFTYPE_AP) |
 587                                        BIT(NL80211_IFTYPE_P2P_GO) |
 588                                        BIT(NL80211_IFTYPE_ADHOC) |
 589                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 590                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 591                                        BIT(NL80211_IFTYPE_MONITOR)))
 592                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 593
 594         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 595                     (wiphy->regulatory_flags &
 596                                         (REGULATORY_CUSTOM_REG |
 597                                          REGULATORY_STRICT_REG |
 598                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 599                                          REGULATORY_COUNTRY_IE_IGNORE))))
 600                 return -EINVAL;
 601
 602         if (WARN_ON(wiphy->coalesce &&
 603                     (!wiphy->coalesce->n_rules ||
 604                      !wiphy->coalesce->n_patterns) &&
 605                     (!wiphy->coalesce->pattern_min_len ||
 606                      wiphy->coalesce->pattern_min_len >
 607                         wiphy->coalesce->pattern_max_len)))
 608                 return -EINVAL;
 609
 610         if (WARN_ON(wiphy->ap_sme_capa &&
 611                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 612                 return -EINVAL;
 613
 614         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 615                 return -EINVAL;
 616
 617         if (WARN_ON(wiphy->addresses &&
 618                     !is_zero_ether_addr(wiphy->perm_addr) &&
 619                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 620                            ETH_ALEN)))
 621                 return -EINVAL;
 622
 623         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 624                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 625                      !rdev->ops->set_mac_acl)))
 626                 return -EINVAL;
 627
 628         if (wiphy->addresses)
 629                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 630
 631         /* sanity check ifmodes */
 632         WARN_ON(!ifmodes);
 633         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 634         if (WARN_ON(ifmodes != wiphy->interface_modes))
 635                 wiphy->interface_modes = ifmodes;
 636
 637         res = wiphy_verify_combinations(wiphy);
 638         if (res)
 639                 return res;
 640
 641         /* sanity check supported bands/channels */
 642         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 643                 sband = wiphy->bands[band];
 644                 if (!sband)
 645                         continue;
 646
 647                 sband->band = band;
 648                 if (WARN_ON(!sband->n_channels))
 649                         return -EINVAL;
 650                 /*
 651                  * on 60GHz band, there are no legacy rates, so
 652                  * n_bitrates is 0
 653                  */
 654                 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
 655                             !sband->n_bitrates))
 656                         return -EINVAL;
 657
 658                 /*
 659                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 660                  * modify the sband's ht data even if the driver uses a
 661                  * global structure for that.
 662                  */
 663                 if (cfg80211_disable_40mhz_24ghz &&
 664                     band == IEEE80211_BAND_2GHZ &&
 665                     sband->ht_cap.ht_supported) {
 666                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 667                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 668                 }
 669
 670                 /*
 671                  * Since we use a u32 for rate bitmaps in
 672                  * ieee80211_get_response_rate, we cannot
 673                  * have more than 32 legacy rates.
 674                  */
 675                 if (WARN_ON(sband->n_bitrates > 32))
 676                         return -EINVAL;
 677
 678                 for (i = 0; i < sband->n_channels; i++) {
 679                         sband->channels[i].orig_flags =
 680                                 sband->channels[i].flags;
 681                         sband->channels[i].orig_mag = INT_MAX;
 682                         sband->channels[i].orig_mpwr =
 683                                 sband->channels[i].max_power;
 684                         sband->channels[i].band = band;
 685                 }
 686
 687                 have_band = true;
 688         }
 689
 690         if (!have_band) {
 691                 WARN_ON(1);
 692                 return -EINVAL;
 693         }
 694
 695 #ifdef CONFIG_PM
 696         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 697                     (!rdev->wiphy.wowlan->pattern_min_len ||
 698                      rdev->wiphy.wowlan->pattern_min_len >
 699                                 rdev->wiphy.wowlan->pattern_max_len)))
 700                 return -EINVAL;
 701 #endif
 702
 703         /* check and set up bitrates */
 704         ieee80211_set_bitrate_flags(wiphy);
 705
 706         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 707
 708         rtnl_lock();
 709         res = device_add(&rdev->wiphy.dev);
 710         if (res) {
 711                 rtnl_unlock();
 712                 return res;
 713         }
 714
 715         /* set up regulatory info */
 716         wiphy_regulatory_register(wiphy);
 717
 718         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 719         cfg80211_rdev_list_generation++;
 720
 721         /* add to debugfs */
 722         rdev->wiphy.debugfsdir =
 723                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 724                                    ieee80211_debugfs_dir);
 725         if (IS_ERR(rdev->wiphy.debugfsdir))
 726                 rdev->wiphy.debugfsdir = NULL;
 727
 728         cfg80211_debugfs_rdev_add(rdev);
 729         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 730
 731         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 732                 struct regulatory_request request;
 733
 734                 request.wiphy_idx = get_wiphy_idx(wiphy);
 735                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 736                 request.alpha2[0] = '9';
 737                 request.alpha2[1] = '9';
 738
 739                 nl80211_send_reg_change_event(&request);
 740         }
 741
 742         rdev->wiphy.registered = true;
 743         rtnl_unlock();
 744
 745         res = rfkill_register(rdev->rfkill);
 746         if (res) {
 747                 rfkill_destroy(rdev->rfkill);
 748                 rdev->rfkill = NULL;
 749                 wiphy_unregister(&rdev->wiphy);
 750                 return res;
 751         }
 752
 753         return 0;
 754 }
 755 EXPORT_SYMBOL(wiphy_register);
 756
 757 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 758 {
 759         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 760
 761         if (!rdev->ops->rfkill_poll)
 762                 return;
 763         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 764         rfkill_resume_polling(rdev->rfkill);
 765 }
 766 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 767
 768 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 769 {
 770         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 771
 772         rfkill_pause_polling(rdev->rfkill);
 773 }
 774 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 775
 776 void wiphy_unregister(struct wiphy *wiphy)
 777 {
 778         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 779
 780         wait_event(rdev->dev_wait, ({
 781                 int __count;
 782                 rtnl_lock();
 783                 __count = rdev->opencount;
 784                 rtnl_unlock();
 785                 __count == 0; }));
 786
 787         if (rdev->rfkill)
 788                 rfkill_unregister(rdev->rfkill);
 789
 790         rtnl_lock();
 791         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 792         rdev->wiphy.registered = false;
 793
 794         WARN_ON(!list_empty(&rdev->wdev_list));
 795
 796         /*
 797          * First remove the hardware from everywhere, this makes
 798          * it impossible to find from userspace.
 799          */
 800         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 801         list_del_rcu(&rdev->list);
 802         synchronize_rcu();
 803
 804         /*
 805          * If this device got a regulatory hint tell core its
 806          * free to listen now to a new shiny device regulatory hint
 807          */
 808         wiphy_regulatory_deregister(wiphy);
 809
 810         cfg80211_rdev_list_generation++;
 811         device_del(&rdev->wiphy.dev);
 812
 813         rtnl_unlock();
 814
 815         flush_work(&rdev->scan_done_wk);
 816         cancel_work_sync(&rdev->conn_work);
 817         flush_work(&rdev->event_work);
 818         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 819         flush_work(&rdev->destroy_work);
 820         flush_work(&rdev->sched_scan_stop_wk);
 821         flush_work(&rdev->mlme_unreg_wk);
 822
 823 #ifdef CONFIG_PM
 824         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
 825                 rdev_set_wakeup(rdev, false);
 826 #endif
 827         cfg80211_rdev_free_wowlan(rdev);
 828         cfg80211_rdev_free_coalesce(rdev);
 829 }
 830 EXPORT_SYMBOL(wiphy_unregister);
 831
 832 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 833 {
 834         struct cfg80211_internal_bss *scan, *tmp;
 835         struct cfg80211_beacon_registration *reg, *treg;
 836         rfkill_destroy(rdev->rfkill);
 837         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 838                 list_del(&reg->list);
 839                 kfree(reg);
 840         }
 841         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 842                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 843         kfree(rdev);
 844 }
 845
 846 void wiphy_free(struct wiphy *wiphy)
 847 {
 848         put_device(&wiphy->dev);
 849 }
 850 EXPORT_SYMBOL(wiphy_free);
 851
 852 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 853 {
 854         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 855
 856         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 857                 schedule_work(&rdev->rfkill_sync);
 858 }
 859 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 860
 861 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 862 {
 863         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 864
 865         ASSERT_RTNL();
 866
 867         if (WARN_ON(wdev->netdev))
 868                 return;
 869
 870         list_del_rcu(&wdev->list);
 871         rdev->devlist_generation++;
 872
 873         switch (wdev->iftype) {
 874         case NL80211_IFTYPE_P2P_DEVICE:
 875                 cfg80211_mlme_purge_registrations(wdev);
 876                 cfg80211_stop_p2p_device(rdev, wdev);
 877                 break;
 878         default:
 879                 WARN_ON_ONCE(1);
 880                 break;
 881         }
 882 }
 883 EXPORT_SYMBOL(cfg80211_unregister_wdev);
 884
 885 static const struct device_type wiphy_type = {
 886         .name   = "wlan",
 887 };
 888
 889 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 890                                enum nl80211_iftype iftype, int num)
 891 {
 892         ASSERT_RTNL();
 893
 894         rdev->num_running_ifaces += num;
 895         if (iftype == NL80211_IFTYPE_MONITOR)
 896                 rdev->num_running_monitor_ifaces += num;
 897 }
 898
 899 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
 900                       struct wireless_dev *wdev)
 901 {
 902         struct net_device *dev = wdev->netdev;
 903         struct cfg80211_sched_scan_request *sched_scan_req;
 904
 905         ASSERT_RTNL();
 906         ASSERT_WDEV_LOCK(wdev);
 907
 908         switch (wdev->iftype) {
 909         case NL80211_IFTYPE_ADHOC:
 910                 __cfg80211_leave_ibss(rdev, dev, true);
 911                 break;
 912         case NL80211_IFTYPE_P2P_CLIENT:
 913         case NL80211_IFTYPE_STATION:
 914                 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
 915                 if (sched_scan_req && dev == sched_scan_req->dev)
 916                         __cfg80211_stop_sched_scan(rdev, false);
 917
 918 #ifdef CONFIG_CFG80211_WEXT
 919                 kfree(wdev->wext.ie);
 920                 wdev->wext.ie = NULL;
 921                 wdev->wext.ie_len = 0;
 922                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 923 #endif
 924                 cfg80211_disconnect(rdev, dev,
 925                                     WLAN_REASON_DEAUTH_LEAVING, true);
 926                 break;
 927         case NL80211_IFTYPE_MESH_POINT:
 928                 __cfg80211_leave_mesh(rdev, dev);
 929                 break;
 930         case NL80211_IFTYPE_AP:
 931         case NL80211_IFTYPE_P2P_GO:
 932                 __cfg80211_stop_ap(rdev, dev, true);
 933                 break;
 934         case NL80211_IFTYPE_OCB:
 935                 __cfg80211_leave_ocb(rdev, dev);
 936                 break;
 937         case NL80211_IFTYPE_WDS:
 938                 /* must be handled by mac80211/driver, has no APIs */
 939                 break;
 940         case NL80211_IFTYPE_P2P_DEVICE:
 941                 /* cannot happen, has no netdev */
 942                 break;
 943         case NL80211_IFTYPE_AP_VLAN:
 944         case NL80211_IFTYPE_MONITOR:
 945                 /* nothing to do */
 946                 break;
 947         case NL80211_IFTYPE_UNSPECIFIED:
 948         case NUM_NL80211_IFTYPES:
 949                 /* invalid */
 950                 break;
 951         }
 952 }
 953
 954 void cfg80211_leave(struct cfg80211_registered_device *rdev,
 955                     struct wireless_dev *wdev)
 956 {
 957         wdev_lock(wdev);
 958         __cfg80211_leave(rdev, wdev);
 959         wdev_unlock(wdev);
 960 }
 961
 962 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
 963                          gfp_t gfp)
 964 {
 965         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 966         struct cfg80211_event *ev;
 967         unsigned long flags;
 968
 969         trace_cfg80211_stop_iface(wiphy, wdev);
 970
 971         ev = kzalloc(sizeof(*ev), gfp);
 972         if (!ev)
 973                 return;
 974
 975         ev->type = EVENT_STOPPED;
 976
 977         spin_lock_irqsave(&wdev->event_lock, flags);
 978         list_add_tail(&ev->list, &wdev->event_list);
 979         spin_unlock_irqrestore(&wdev->event_lock, flags);
 980         queue_work(cfg80211_wq, &rdev->event_work);
 981 }
 982 EXPORT_SYMBOL(cfg80211_stop_iface);
 983
 984 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 985                                          unsigned long state, void *ptr)
 986 {
 987         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 988         struct wireless_dev *wdev = dev->ieee80211_ptr;
 989         struct cfg80211_registered_device *rdev;
 990         struct cfg80211_sched_scan_request *sched_scan_req;
 991
 992         if (!wdev)
 993                 return NOTIFY_DONE;
 994
 995         rdev = wiphy_to_rdev(wdev->wiphy);
 996
 997         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 998
 999         switch (state) {
1000         case NETDEV_POST_INIT:
1001                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1002                 break;
1003         case NETDEV_REGISTER:
1004                 /*
1005                  * NB: cannot take rdev->mtx here because this may be
1006                  * called within code protected by it when interfaces
1007                  * are added with nl80211.
1008                  */
1009                 mutex_init(&wdev->mtx);
1010                 INIT_LIST_HEAD(&wdev->event_list);
1011                 spin_lock_init(&wdev->event_lock);
1012                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1013                 spin_lock_init(&wdev->mgmt_registrations_lock);
1014
1015                 wdev->identifier = ++rdev->wdev_id;
1016                 list_add_rcu(&wdev->list, &rdev->wdev_list);
1017                 rdev->devlist_generation++;
1018                 /* can only change netns with wiphy */
1019                 dev->features |= NETIF_F_NETNS_LOCAL;
1020
1021                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1022                                       "phy80211")) {
1023                         pr_err("failed to add phy80211 symlink to netdev!\n");
1024                 }
1025                 wdev->netdev = dev;
1026 #ifdef CONFIG_CFG80211_WEXT
1027                 wdev->wext.default_key = -1;
1028                 wdev->wext.default_mgmt_key = -1;
1029                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1030 #endif
1031
1032                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1033                         wdev->ps = true;
1034                 else
1035                         wdev->ps = false;
1036                 /* allow mac80211 to determine the timeout */
1037                 wdev->ps_timeout = -1;
1038
1039                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1040                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1041                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1042                         dev->priv_flags |= IFF_DONT_BRIDGE;
1043                 break;
1044         case NETDEV_GOING_DOWN:
1045                 cfg80211_leave(rdev, wdev);
1046                 break;
1047         case NETDEV_DOWN:
1048                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1049                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1050                         if (WARN_ON(!rdev->scan_req->notified))
1051                                 rdev->scan_req->aborted = true;
1052                         ___cfg80211_scan_done(rdev, false);
1053                 }
1054
1055                 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1056                 if (WARN_ON(sched_scan_req &&
1057                             sched_scan_req->dev == wdev->netdev)) {
1058                         __cfg80211_stop_sched_scan(rdev, false);
1059                 }
1060
1061                 rdev->opencount--;
1062                 wake_up(&rdev->dev_wait);
1063                 break;
1064         case NETDEV_UP:
1065                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1066                 wdev_lock(wdev);
1067                 switch (wdev->iftype) {
1068 #ifdef CONFIG_CFG80211_WEXT
1069                 case NL80211_IFTYPE_ADHOC:
1070                         cfg80211_ibss_wext_join(rdev, wdev);
1071                         break;
1072                 case NL80211_IFTYPE_STATION:
1073                         cfg80211_mgd_wext_connect(rdev, wdev);
1074                         break;
1075 #endif
1076 #ifdef CONFIG_MAC80211_MESH
1077                 case NL80211_IFTYPE_MESH_POINT:
1078                         {
1079                                 /* backward compat code... */
1080                                 struct mesh_setup setup;
1081                                 memcpy(&setup, &default_mesh_setup,
1082                                                 sizeof(setup));
1083                                  /* back compat only needed for mesh_id */
1084                                 setup.mesh_id = wdev->ssid;
1085                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1086                                 if (wdev->mesh_id_up_len)
1087                                         __cfg80211_join_mesh(rdev, dev,
1088                                                         &setup,
1089                                                         &default_mesh_config);
1090                                 break;
1091                         }
1092 #endif
1093                 default:
1094                         break;
1095                 }
1096                 wdev_unlock(wdev);
1097                 rdev->opencount++;
1098
1099                 /*
1100                  * Configure power management to the driver here so that its
1101                  * correctly set also after interface type changes etc.
1102                  */
1103                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1104                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1105                     rdev->ops->set_power_mgmt)
1106                         if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
1107                                                 wdev->ps_timeout)) {
1108                                 /* assume this means it's off */
1109                                 wdev->ps = false;
1110                         }
1111                 break;
1112         case NETDEV_UNREGISTER:
1113                 /*
1114                  * It is possible to get NETDEV_UNREGISTER
1115                  * multiple times. To detect that, check
1116                  * that the interface is still on the list
1117                  * of registered interfaces, and only then
1118                  * remove and clean it up.
1119                  */
1120                 if (!list_empty(&wdev->list)) {
1121                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1122                         list_del_rcu(&wdev->list);
1123                         rdev->devlist_generation++;
1124                         cfg80211_mlme_purge_registrations(wdev);
1125 #ifdef CONFIG_CFG80211_WEXT
1126                         kzfree(wdev->wext.keys);
1127 #endif
1128                 }
1129                 /*
1130                  * synchronise (so that we won't find this netdev
1131                  * from other code any more) and then clear the list
1132                  * head so that the above code can safely check for
1133                  * !list_empty() to avoid double-cleanup.
1134                  */
1135                 synchronize_rcu();
1136                 INIT_LIST_HEAD(&wdev->list);
1137                 /*
1138                  * Ensure that all events have been processed and
1139                  * freed.
1140                  */
1141                 cfg80211_process_wdev_events(wdev);
1142
1143                 if (WARN_ON(wdev->current_bss)) {
1144                         cfg80211_unhold_bss(wdev->current_bss);
1145                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1146                         wdev->current_bss = NULL;
1147                 }
1148                 break;
1149         case NETDEV_PRE_UP:
1150                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1151                         return notifier_from_errno(-EOPNOTSUPP);
1152                 if (rfkill_blocked(rdev->rfkill))
1153                         return notifier_from_errno(-ERFKILL);
1154                 break;
1155         default:
1156                 return NOTIFY_DONE;
1157         }
1158
1159         wireless_nlevent_flush();
1160
1161         return NOTIFY_OK;
1162 }
1163
1164 static struct notifier_block cfg80211_netdev_notifier = {
1165         .notifier_call = cfg80211_netdev_notifier_call,
1166 };
1167
1168 static void __net_exit cfg80211_pernet_exit(struct net *net)
1169 {
1170         struct cfg80211_registered_device *rdev;
1171
1172         rtnl_lock();
1173         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1174                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1175                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1176         }
1177         rtnl_unlock();
1178 }
1179
1180 static struct pernet_operations cfg80211_pernet_ops = {
1181         .exit = cfg80211_pernet_exit,
1182 };
1183
1184 static int __init cfg80211_init(void)
1185 {
1186         int err;
1187
1188         err = register_pernet_device(&cfg80211_pernet_ops);
1189         if (err)
1190                 goto out_fail_pernet;
1191
1192         err = wiphy_sysfs_init();
1193         if (err)
1194                 goto out_fail_sysfs;
1195
1196         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1197         if (err)
1198                 goto out_fail_notifier;
1199
1200         err = nl80211_init();
1201         if (err)
1202                 goto out_fail_nl80211;
1203
1204         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1205
1206         err = regulatory_init();
1207         if (err)
1208                 goto out_fail_reg;
1209
1210         cfg80211_wq = create_singlethread_workqueue("cfg80211");
1211         if (!cfg80211_wq) {
1212                 err = -ENOMEM;
1213                 goto out_fail_wq;
1214         }
1215
1216         return 0;
1217
1218 out_fail_wq:
1219         regulatory_exit();
1220 out_fail_reg:
1221         debugfs_remove(ieee80211_debugfs_dir);
1222         nl80211_exit();
1223 out_fail_nl80211:
1224         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1225 out_fail_notifier:
1226         wiphy_sysfs_exit();
1227 out_fail_sysfs:
1228         unregister_pernet_device(&cfg80211_pernet_ops);
1229 out_fail_pernet:
1230         return err;
1231 }
1232 subsys_initcall(cfg80211_init);
1233
1234 static void __exit cfg80211_exit(void)
1235 {
1236         debugfs_remove(ieee80211_debugfs_dir);
1237         nl80211_exit();
1238         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1239         wiphy_sysfs_exit();
1240         regulatory_exit();
1241         unregister_pernet_device(&cfg80211_pernet_ops);
1242         destroy_workqueue(cfg80211_wq);
1243 }
1244 module_exit(cfg80211_exit);