kernel/net/wireless/core.c

   1 /*
   2  * This is the linux wireless configuration interface.
   3  *
   4  * Copyright 2006-2010          Johannes Berg <johannes@sipsolutions.net>
   5  * Copyright 2013-2014  Intel Mobile Communications GmbH
   6  */
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/if.h>
  11 #include <linux/module.h>
  12 #include <linux/err.h>
  13 #include <linux/list.h>
  14 #include <linux/slab.h>
  15 #include <linux/nl80211.h>
  16 #include <linux/debugfs.h>
  17 #include <linux/notifier.h>
  18 #include <linux/device.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/sched.h>
  22 #include <net/genetlink.h>
  23 #include <net/cfg80211.h>
  24 #include "nl80211.h"
  25 #include "core.h"
  26 #include "sysfs.h"
  27 #include "debugfs.h"
  28 #include "wext-compat.h"
  29 #include "rdev-ops.h"
  30
  31 /* name for sysfs, %d is appended */
  32 #define PHY_NAME "phy"
  33
  34 MODULE_AUTHOR("Johannes Berg");
  35 MODULE_LICENSE("GPL");
  36 MODULE_DESCRIPTION("wireless configuration support");
  37 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
  38
  39 /* RCU-protected (and RTNL for writers) */
  40 LIST_HEAD(cfg80211_rdev_list);
  41 int cfg80211_rdev_list_generation;
  42
  43 /* for debugfs */
  44 static struct dentry *ieee80211_debugfs_dir;
  45
  46 /* for the cleanup, scan and event works */
  47 struct workqueue_struct *cfg80211_wq;
  48
  49 static bool cfg80211_disable_40mhz_24ghz;
  50 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  51 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  52                  "Disable 40MHz support in the 2.4GHz band");
  53
  54 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  55 {
  56         struct cfg80211_registered_device *result = NULL, *rdev;
  57
  58         ASSERT_RTNL();
  59
  60         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  61                 if (rdev->wiphy_idx == wiphy_idx) {
  62                         result = rdev;
  63                         break;
  64                 }
  65         }
  66
  67         return result;
  68 }
  69
  70 int get_wiphy_idx(struct wiphy *wiphy)
  71 {
  72         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
  73
  74         return rdev->wiphy_idx;
  75 }
  76
  77 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  78 {
  79         struct cfg80211_registered_device *rdev;
  80
  81         ASSERT_RTNL();
  82
  83         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  84         if (!rdev)
  85                 return NULL;
  86         return &rdev->wiphy;
  87 }
  88
  89 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
  90                                    const char *newname)
  91 {
  92         struct cfg80211_registered_device *rdev2;
  93         int wiphy_idx, taken = -1, digits;
  94
  95         ASSERT_RTNL();
  96
  97         /* prohibit calling the thing phy%d when %d is not its number */
  98         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
  99         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 100                 /* count number of places needed to print wiphy_idx */
 101                 digits = 1;
 102                 while (wiphy_idx /= 10)
 103                         digits++;
 104                 /*
 105                  * deny the name if it is phy<idx> where <idx> is printed
 106                  * without leading zeroes. taken == strlen(newname) here
 107                  */
 108                 if (taken == strlen(PHY_NAME) + digits)
 109                         return -EINVAL;
 110         }
 111
 112         /* Ensure another device does not already have this name. */
 113         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 114                 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
 115                         return -EINVAL;
 116
 117         return 0;
 118 }
 119
 120 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 121                         char *newname)
 122 {
 123         int result;
 124
 125         ASSERT_RTNL();
 126
 127         /* Ignore nop renames */
 128         if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
 129                 return 0;
 130
 131         result = cfg80211_dev_check_name(rdev, newname);
 132         if (result < 0)
 133                 return result;
 134
 135         result = device_rename(&rdev->wiphy.dev, newname);
 136         if (result)
 137                 return result;
 138
 139         if (rdev->wiphy.debugfsdir &&
 140             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 141                             rdev->wiphy.debugfsdir,
 142                             rdev->wiphy.debugfsdir->d_parent,
 143                             newname))
 144                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 145
 146         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 147
 148         return 0;
 149 }
 150
 151 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 152                           struct net *net)
 153 {
 154         struct wireless_dev *wdev;
 155         int err = 0;
 156
 157         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 158                 return -EOPNOTSUPP;
 159
 160         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 161                 if (!wdev->netdev)
 162                         continue;
 163                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 164                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 165                 if (err)
 166                         break;
 167                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 168         }
 169
 170         if (err) {
 171                 /* failed -- clean up to old netns */
 172                 net = wiphy_net(&rdev->wiphy);
 173
 174                 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,
 175                                                      list) {
 176                         if (!wdev->netdev)
 177                                 continue;
 178                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 179                         err = dev_change_net_namespace(wdev->netdev, net,
 180                                                         "wlan%d");
 181                         WARN_ON(err);
 182                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 183                 }
 184
 185                 return err;
 186         }
 187
 188         wiphy_net_set(&rdev->wiphy, net);
 189
 190         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 191         WARN_ON(err);
 192
 193         return 0;
 194 }
 195
 196 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 197 {
 198         struct cfg80211_registered_device *rdev = data;
 199
 200         rdev_rfkill_poll(rdev);
 201 }
 202
 203 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 204                               struct wireless_dev *wdev)
 205 {
 206         ASSERT_RTNL();
 207
 208         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 209                 return;
 210
 211         if (!wdev->p2p_started)
 212                 return;
 213
 214         rdev_stop_p2p_device(rdev, wdev);
 215         wdev->p2p_started = false;
 216
 217         rdev->opencount--;
 218
 219         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 220                 if (WARN_ON(!rdev->scan_req->notified))
 221                         rdev->scan_req->aborted = true;
 222                 ___cfg80211_scan_done(rdev, false);
 223         }
 224 }
 225
 226 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 227 {
 228         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 229         struct wireless_dev *wdev;
 230
 231         ASSERT_RTNL();
 232
 233         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 234                 if (wdev->netdev) {
 235                         dev_close(wdev->netdev);
 236                         continue;
 237                 }
 238                 /* otherwise, check iftype */
 239                 switch (wdev->iftype) {
 240                 case NL80211_IFTYPE_P2P_DEVICE:
 241                         cfg80211_stop_p2p_device(rdev, wdev);
 242                         break;
 243                 default:
 244                         break;
 245                 }
 246         }
 247 }
 248 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 249
 250 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 251 {
 252         struct cfg80211_registered_device *rdev = data;
 253
 254         if (!blocked)
 255                 return 0;
 256
 257         rtnl_lock();
 258         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 259         rtnl_unlock();
 260
 261         return 0;
 262 }
 263
 264 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 265 {
 266         struct cfg80211_registered_device *rdev;
 267
 268         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 269         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 270 }
 271
 272 static void cfg80211_event_work(struct work_struct *work)
 273 {
 274         struct cfg80211_registered_device *rdev;
 275
 276         rdev = container_of(work, struct cfg80211_registered_device,
 277                             event_work);
 278
 279         rtnl_lock();
 280         cfg80211_process_rdev_events(rdev);
 281         rtnl_unlock();
 282 }
 283
 284 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 285 {
 286         struct cfg80211_iface_destroy *item;
 287
 288         ASSERT_RTNL();
 289
 290         spin_lock_irq(&rdev->destroy_list_lock);
 291         while ((item = list_first_entry_or_null(&rdev->destroy_list,
 292                                                 struct cfg80211_iface_destroy,
 293                                                 list))) {
 294                 struct wireless_dev *wdev, *tmp;
 295                 u32 nlportid = item->nlportid;
 296
 297                 list_del(&item->list);
 298                 kfree(item);
 299                 spin_unlock_irq(&rdev->destroy_list_lock);
 300
 301                 list_for_each_entry_safe(wdev, tmp, &rdev->wdev_list, list) {
 302                         if (nlportid == wdev->owner_nlportid)
 303                                 rdev_del_virtual_intf(rdev, wdev);
 304                 }
 305
 306                 spin_lock_irq(&rdev->destroy_list_lock);
 307         }
 308         spin_unlock_irq(&rdev->destroy_list_lock);
 309 }
 310
 311 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 312 {
 313         struct cfg80211_registered_device *rdev;
 314
 315         rdev = container_of(work, struct cfg80211_registered_device,
 316                             destroy_work);
 317
 318         rtnl_lock();
 319         cfg80211_destroy_ifaces(rdev);
 320         rtnl_unlock();
 321 }
 322
 323 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
 324 {
 325         struct cfg80211_registered_device *rdev;
 326
 327         rdev = container_of(work, struct cfg80211_registered_device,
 328                            sched_scan_stop_wk);
 329
 330         rtnl_lock();
 331
 332         __cfg80211_stop_sched_scan(rdev, false);
 333
 334         rtnl_unlock();
 335 }
 336
 337 /* exported functions */
 338
 339 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 340                            const char *requested_name)
 341 {
 342         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 343
 344         struct cfg80211_registered_device *rdev;
 345         int alloc_size;
 346
 347         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 348         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 349         WARN_ON(ops->connect && !ops->disconnect);
 350         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 351         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 352         WARN_ON(ops->add_station && !ops->del_station);
 353         WARN_ON(ops->add_mpath && !ops->del_mpath);
 354         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 355
 356         alloc_size = sizeof(*rdev) + sizeof_priv;
 357
 358         rdev = kzalloc(alloc_size, GFP_KERNEL);
 359         if (!rdev)
 360                 return NULL;
 361
 362         rdev->ops = ops;
 363
 364         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 365
 366         if (unlikely(rdev->wiphy_idx < 0)) {
 367                 /* ugh, wrapped! */
 368                 atomic_dec(&wiphy_counter);
 369                 kfree(rdev);
 370                 return NULL;
 371         }
 372
 373         /* atomic_inc_return makes it start at 1, make it start at 0 */
 374         rdev->wiphy_idx--;
 375
 376         /* give it a proper name */
 377         if (requested_name && requested_name[0]) {
 378                 int rv;
 379
 380                 rtnl_lock();
 381                 rv = cfg80211_dev_check_name(rdev, requested_name);
 382
 383                 if (rv < 0) {
 384                         rtnl_unlock();
 385                         goto use_default_name;
 386                 }
 387
 388                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 389                 rtnl_unlock();
 390                 if (rv)
 391                         goto use_default_name;
 392         } else {
 393 use_default_name:
 394                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 395                  * the restrictions on phy names.  Probably this call could
 396                  * fail if some other part of the kernel (re)named a device
 397                  * phyX.  But, might should add some locking and check return
 398                  * value, and use a different name if this one exists?
 399                  */
 400                 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 401         }
 402
 403         INIT_LIST_HEAD(&rdev->wdev_list);
 404         INIT_LIST_HEAD(&rdev->beacon_registrations);
 405         spin_lock_init(&rdev->beacon_registrations_lock);
 406         spin_lock_init(&rdev->bss_lock);
 407         INIT_LIST_HEAD(&rdev->bss_list);
 408         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 409         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 410         INIT_LIST_HEAD(&rdev->mlme_unreg);
 411         spin_lock_init(&rdev->mlme_unreg_lock);
 412         INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
 413         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 414                           cfg80211_dfs_channels_update_work);
 415 #ifdef CONFIG_CFG80211_WEXT
 416         rdev->wiphy.wext = &cfg80211_wext_handler;
 417 #endif
 418
 419         device_initialize(&rdev->wiphy.dev);
 420         rdev->wiphy.dev.class = &ieee80211_class;
 421         rdev->wiphy.dev.platform_data = rdev;
 422         device_enable_async_suspend(&rdev->wiphy.dev);
 423
 424         INIT_LIST_HEAD(&rdev->destroy_list);
 425         spin_lock_init(&rdev->destroy_list_lock);
 426         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 427         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 428
 429 #ifdef CONFIG_CFG80211_DEFAULT_PS
 430         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 431 #endif
 432
 433         wiphy_net_set(&rdev->wiphy, &init_net);
 434
 435         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 436         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 437                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 438                                    &rdev->rfkill_ops, rdev);
 439
 440         if (!rdev->rfkill) {
 441                 kfree(rdev);
 442                 return NULL;
 443         }
 444
 445         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 446         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 447         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 448
 449         init_waitqueue_head(&rdev->dev_wait);
 450
 451         /*
 452          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 453          * Fragmentation and RTS threshold are disabled by default with the
 454          * special -1 value.
 455          */
 456         rdev->wiphy.retry_short = 7;
 457         rdev->wiphy.retry_long = 4;
 458         rdev->wiphy.frag_threshold = (u32) -1;
 459         rdev->wiphy.rts_threshold = (u32) -1;
 460         rdev->wiphy.coverage_class = 0;
 461
 462         rdev->wiphy.max_num_csa_counters = 1;
 463
 464         rdev->wiphy.max_sched_scan_plans = 1;
 465         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 466
 467         return &rdev->wiphy;
 468 }
 469 EXPORT_SYMBOL(wiphy_new_nm);
 470
 471 static int wiphy_verify_combinations(struct wiphy *wiphy)
 472 {
 473         const struct ieee80211_iface_combination *c;
 474         int i, j;
 475
 476         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 477                 u32 cnt = 0;
 478                 u16 all_iftypes = 0;
 479
 480                 c = &wiphy->iface_combinations[i];
 481
 482                 /*
 483                  * Combinations with just one interface aren't real,
 484                  * however we make an exception for DFS.
 485                  */
 486                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 487                         return -EINVAL;
 488
 489                 /* Need at least one channel */
 490                 if (WARN_ON(!c->num_different_channels))
 491                         return -EINVAL;
 492
 493                 /*
 494                  * Put a sane limit on maximum number of different
 495                  * channels to simplify channel accounting code.
 496                  */
 497                 if (WARN_ON(c->num_different_channels >
 498                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 499                         return -EINVAL;
 500
 501                 /* DFS only works on one channel. */
 502                 if (WARN_ON(c->radar_detect_widths &&
 503                             (c->num_different_channels > 1)))
 504                         return -EINVAL;
 505
 506                 if (WARN_ON(!c->n_limits))
 507                         return -EINVAL;
 508
 509                 for (j = 0; j < c->n_limits; j++) {
 510                         u16 types = c->limits[j].types;
 511
 512                         /* interface types shouldn't overlap */
 513                         if (WARN_ON(types & all_iftypes))
 514                                 return -EINVAL;
 515                         all_iftypes |= types;
 516
 517                         if (WARN_ON(!c->limits[j].max))
 518                                 return -EINVAL;
 519
 520                         /* Shouldn't list software iftypes in combinations! */
 521                         if (WARN_ON(wiphy->software_iftypes & types))
 522                                 return -EINVAL;
 523
 524                         /* Only a single P2P_DEVICE can be allowed */
 525                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 526                                     c->limits[j].max > 1))
 527                                 return -EINVAL;
 528
 529                         cnt += c->limits[j].max;
 530                         /*
 531                          * Don't advertise an unsupported type
 532                          * in a combination.
 533                          */
 534                         if (WARN_ON((wiphy->interface_modes & types) != types))
 535                                 return -EINVAL;
 536                 }
 537
 538                 /* You can't even choose that many! */
 539                 if (WARN_ON(cnt < c->max_interfaces))
 540                         return -EINVAL;
 541         }
 542
 543         return 0;
 544 }
 545
 546 int wiphy_register(struct wiphy *wiphy)
 547 {
 548         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 549         int res;
 550         enum ieee80211_band band;
 551         struct ieee80211_supported_band *sband;
 552         bool have_band = false;
 553         int i;
 554         u16 ifmodes = wiphy->interface_modes;
 555
 556 #ifdef CONFIG_PM
 557         if (WARN_ON(wiphy->wowlan &&
 558                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 559                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 560                 return -EINVAL;
 561         if (WARN_ON(wiphy->wowlan &&
 562                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 563                     !wiphy->wowlan->tcp))
 564                 return -EINVAL;
 565 #endif
 566         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 567                     (!rdev->ops->tdls_channel_switch ||
 568                      !rdev->ops->tdls_cancel_channel_switch)))
 569                 return -EINVAL;
 570
 571         /*
 572          * if a wiphy has unsupported modes for regulatory channel enforcement,
 573          * opt-out of enforcement checking
 574          */
 575         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 576                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 577                                        BIT(NL80211_IFTYPE_AP) |
 578                                        BIT(NL80211_IFTYPE_P2P_GO) |
 579                                        BIT(NL80211_IFTYPE_ADHOC) |
 580                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 581                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 582                                        BIT(NL80211_IFTYPE_MONITOR)))
 583                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 584
 585         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 586                     (wiphy->regulatory_flags &
 587                                         (REGULATORY_CUSTOM_REG |
 588                                          REGULATORY_STRICT_REG |
 589                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 590                                          REGULATORY_COUNTRY_IE_IGNORE))))
 591                 return -EINVAL;
 592
 593         if (WARN_ON(wiphy->coalesce &&
 594                     (!wiphy->coalesce->n_rules ||
 595                      !wiphy->coalesce->n_patterns) &&
 596                     (!wiphy->coalesce->pattern_min_len ||
 597                      wiphy->coalesce->pattern_min_len >
 598                         wiphy->coalesce->pattern_max_len)))
 599                 return -EINVAL;
 600
 601         if (WARN_ON(wiphy->ap_sme_capa &&
 602                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 603                 return -EINVAL;
 604
 605         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 606                 return -EINVAL;
 607
 608         if (WARN_ON(wiphy->addresses &&
 609                     !is_zero_ether_addr(wiphy->perm_addr) &&
 610                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 611                            ETH_ALEN)))
 612                 return -EINVAL;
 613
 614         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 615                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 616                      !rdev->ops->set_mac_acl)))
 617                 return -EINVAL;
 618
 619         if (wiphy->addresses)
 620                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 621
 622         /* sanity check ifmodes */
 623         WARN_ON(!ifmodes);
 624         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 625         if (WARN_ON(ifmodes != wiphy->interface_modes))
 626                 wiphy->interface_modes = ifmodes;
 627
 628         res = wiphy_verify_combinations(wiphy);
 629         if (res)
 630                 return res;
 631
 632         /* sanity check supported bands/channels */
 633         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 634                 sband = wiphy->bands[band];
 635                 if (!sband)
 636                         continue;
 637
 638                 sband->band = band;
 639                 if (WARN_ON(!sband->n_channels))
 640                         return -EINVAL;
 641                 /*
 642                  * on 60GHz band, there are no legacy rates, so
 643                  * n_bitrates is 0
 644                  */
 645                 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
 646                             !sband->n_bitrates))
 647                         return -EINVAL;
 648
 649                 /*
 650                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 651                  * modify the sband's ht data even if the driver uses a
 652                  * global structure for that.
 653                  */
 654                 if (cfg80211_disable_40mhz_24ghz &&
 655                     band == IEEE80211_BAND_2GHZ &&
 656                     sband->ht_cap.ht_supported) {
 657                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 658                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 659                 }
 660
 661                 /*
 662                  * Since we use a u32 for rate bitmaps in
 663                  * ieee80211_get_response_rate, we cannot
 664                  * have more than 32 legacy rates.
 665                  */
 666                 if (WARN_ON(sband->n_bitrates > 32))
 667                         return -EINVAL;
 668
 669                 for (i = 0; i < sband->n_channels; i++) {
 670                         sband->channels[i].orig_flags =
 671                                 sband->channels[i].flags;
 672                         sband->channels[i].orig_mag = INT_MAX;
 673                         sband->channels[i].orig_mpwr =
 674                                 sband->channels[i].max_power;
 675                         sband->channels[i].band = band;
 676                 }
 677
 678                 have_band = true;
 679         }
 680
 681         if (!have_band) {
 682                 WARN_ON(1);
 683                 return -EINVAL;
 684         }
 685
 686 #ifdef CONFIG_PM
 687         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 688                     (!rdev->wiphy.wowlan->pattern_min_len ||
 689                      rdev->wiphy.wowlan->pattern_min_len >
 690                                 rdev->wiphy.wowlan->pattern_max_len)))
 691                 return -EINVAL;
 692 #endif
 693
 694         /* check and set up bitrates */
 695         ieee80211_set_bitrate_flags(wiphy);
 696
 697         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 698
 699         rtnl_lock();
 700         res = device_add(&rdev->wiphy.dev);
 701         if (res) {
 702                 rtnl_unlock();
 703                 return res;
 704         }
 705
 706         /* set up regulatory info */
 707         wiphy_regulatory_register(wiphy);
 708
 709         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 710         cfg80211_rdev_list_generation++;
 711
 712         /* add to debugfs */
 713         rdev->wiphy.debugfsdir =
 714                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 715                                    ieee80211_debugfs_dir);
 716         if (IS_ERR(rdev->wiphy.debugfsdir))
 717                 rdev->wiphy.debugfsdir = NULL;
 718
 719         cfg80211_debugfs_rdev_add(rdev);
 720         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 721
 722         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 723                 struct regulatory_request request;
 724
 725                 request.wiphy_idx = get_wiphy_idx(wiphy);
 726                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 727                 request.alpha2[0] = '9';
 728                 request.alpha2[1] = '9';
 729
 730                 nl80211_send_reg_change_event(&request);
 731         }
 732
 733         rdev->wiphy.registered = true;
 734         rtnl_unlock();
 735
 736         res = rfkill_register(rdev->rfkill);
 737         if (res) {
 738                 rfkill_destroy(rdev->rfkill);
 739                 rdev->rfkill = NULL;
 740                 wiphy_unregister(&rdev->wiphy);
 741                 return res;
 742         }
 743
 744         return 0;
 745 }
 746 EXPORT_SYMBOL(wiphy_register);
 747
 748 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 749 {
 750         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 751
 752         if (!rdev->ops->rfkill_poll)
 753                 return;
 754         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 755         rfkill_resume_polling(rdev->rfkill);
 756 }
 757 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 758
 759 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 760 {
 761         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 762
 763         rfkill_pause_polling(rdev->rfkill);
 764 }
 765 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 766
 767 void wiphy_unregister(struct wiphy *wiphy)
 768 {
 769         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 770
 771         wait_event(rdev->dev_wait, ({
 772                 int __count;
 773                 rtnl_lock();
 774                 __count = rdev->opencount;
 775                 rtnl_unlock();
 776                 __count == 0; }));
 777
 778         if (rdev->rfkill)
 779                 rfkill_unregister(rdev->rfkill);
 780
 781         rtnl_lock();
 782         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 783         rdev->wiphy.registered = false;
 784
 785         WARN_ON(!list_empty(&rdev->wdev_list));
 786
 787         /*
 788          * First remove the hardware from everywhere, this makes
 789          * it impossible to find from userspace.
 790          */
 791         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 792         list_del_rcu(&rdev->list);
 793         synchronize_rcu();
 794
 795         /*
 796          * If this device got a regulatory hint tell core its
 797          * free to listen now to a new shiny device regulatory hint
 798          */
 799         wiphy_regulatory_deregister(wiphy);
 800
 801         cfg80211_rdev_list_generation++;
 802         device_del(&rdev->wiphy.dev);
 803
 804         rtnl_unlock();
 805
 806         flush_work(&rdev->scan_done_wk);
 807         cancel_work_sync(&rdev->conn_work);
 808         flush_work(&rdev->event_work);
 809         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 810         flush_work(&rdev->destroy_work);
 811         flush_work(&rdev->sched_scan_stop_wk);
 812         flush_work(&rdev->mlme_unreg_wk);
 813
 814 #ifdef CONFIG_PM
 815         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
 816                 rdev_set_wakeup(rdev, false);
 817 #endif
 818         cfg80211_rdev_free_wowlan(rdev);
 819         cfg80211_rdev_free_coalesce(rdev);
 820 }
 821 EXPORT_SYMBOL(wiphy_unregister);
 822
 823 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 824 {
 825         struct cfg80211_internal_bss *scan, *tmp;
 826         struct cfg80211_beacon_registration *reg, *treg;
 827         rfkill_destroy(rdev->rfkill);
 828         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 829                 list_del(&reg->list);
 830                 kfree(reg);
 831         }
 832         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 833                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 834         kfree(rdev);
 835 }
 836
 837 void wiphy_free(struct wiphy *wiphy)
 838 {
 839         put_device(&wiphy->dev);
 840 }
 841 EXPORT_SYMBOL(wiphy_free);
 842
 843 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 844 {
 845         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 846
 847         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 848                 schedule_work(&rdev->rfkill_sync);
 849 }
 850 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 851
 852 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 853 {
 854         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 855
 856         ASSERT_RTNL();
 857
 858         if (WARN_ON(wdev->netdev))
 859                 return;
 860
 861         list_del_rcu(&wdev->list);
 862         rdev->devlist_generation++;
 863
 864         switch (wdev->iftype) {
 865         case NL80211_IFTYPE_P2P_DEVICE:
 866                 cfg80211_mlme_purge_registrations(wdev);
 867                 cfg80211_stop_p2p_device(rdev, wdev);
 868                 break;
 869         default:
 870                 WARN_ON_ONCE(1);
 871                 break;
 872         }
 873 }
 874 EXPORT_SYMBOL(cfg80211_unregister_wdev);
 875
 876 static const struct device_type wiphy_type = {
 877         .name   = "wlan",
 878 };
 879
 880 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 881                                enum nl80211_iftype iftype, int num)
 882 {
 883         ASSERT_RTNL();
 884
 885         rdev->num_running_ifaces += num;
 886         if (iftype == NL80211_IFTYPE_MONITOR)
 887                 rdev->num_running_monitor_ifaces += num;
 888 }
 889
 890 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
 891                       struct wireless_dev *wdev)
 892 {
 893         struct net_device *dev = wdev->netdev;
 894         struct cfg80211_sched_scan_request *sched_scan_req;
 895
 896         ASSERT_RTNL();
 897         ASSERT_WDEV_LOCK(wdev);
 898
 899         switch (wdev->iftype) {
 900         case NL80211_IFTYPE_ADHOC:
 901                 __cfg80211_leave_ibss(rdev, dev, true);
 902                 break;
 903         case NL80211_IFTYPE_P2P_CLIENT:
 904         case NL80211_IFTYPE_STATION:
 905                 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
 906                 if (sched_scan_req && dev == sched_scan_req->dev)
 907                         __cfg80211_stop_sched_scan(rdev, false);
 908
 909 #ifdef CONFIG_CFG80211_WEXT
 910                 kfree(wdev->wext.ie);
 911                 wdev->wext.ie = NULL;
 912                 wdev->wext.ie_len = 0;
 913                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 914 #endif
 915                 cfg80211_disconnect(rdev, dev,
 916                                     WLAN_REASON_DEAUTH_LEAVING, true);
 917                 break;
 918         case NL80211_IFTYPE_MESH_POINT:
 919                 __cfg80211_leave_mesh(rdev, dev);
 920                 break;
 921         case NL80211_IFTYPE_AP:
 922         case NL80211_IFTYPE_P2P_GO:
 923                 __cfg80211_stop_ap(rdev, dev, true);
 924                 break;
 925         case NL80211_IFTYPE_OCB:
 926                 __cfg80211_leave_ocb(rdev, dev);
 927                 break;
 928         case NL80211_IFTYPE_WDS:
 929                 /* must be handled by mac80211/driver, has no APIs */
 930                 break;
 931         case NL80211_IFTYPE_P2P_DEVICE:
 932                 /* cannot happen, has no netdev */
 933                 break;
 934         case NL80211_IFTYPE_AP_VLAN:
 935         case NL80211_IFTYPE_MONITOR:
 936                 /* nothing to do */
 937                 break;
 938         case NL80211_IFTYPE_UNSPECIFIED:
 939         case NUM_NL80211_IFTYPES:
 940                 /* invalid */
 941                 break;
 942         }
 943 }
 944
 945 void cfg80211_leave(struct cfg80211_registered_device *rdev,
 946                     struct wireless_dev *wdev)
 947 {
 948         wdev_lock(wdev);
 949         __cfg80211_leave(rdev, wdev);
 950         wdev_unlock(wdev);
 951 }
 952
 953 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
 954                          gfp_t gfp)
 955 {
 956         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 957         struct cfg80211_event *ev;
 958         unsigned long flags;
 959
 960         trace_cfg80211_stop_iface(wiphy, wdev);
 961
 962         ev = kzalloc(sizeof(*ev), gfp);
 963         if (!ev)
 964                 return;
 965
 966         ev->type = EVENT_STOPPED;
 967
 968         spin_lock_irqsave(&wdev->event_lock, flags);
 969         list_add_tail(&ev->list, &wdev->event_list);
 970         spin_unlock_irqrestore(&wdev->event_lock, flags);
 971         queue_work(cfg80211_wq, &rdev->event_work);
 972 }
 973 EXPORT_SYMBOL(cfg80211_stop_iface);
 974
 975 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 976                                          unsigned long state, void *ptr)
 977 {
 978         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 979         struct wireless_dev *wdev = dev->ieee80211_ptr;
 980         struct cfg80211_registered_device *rdev;
 981         struct cfg80211_sched_scan_request *sched_scan_req;
 982
 983         if (!wdev)
 984                 return NOTIFY_DONE;
 985
 986         rdev = wiphy_to_rdev(wdev->wiphy);
 987
 988         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 989
 990         switch (state) {
 991         case NETDEV_POST_INIT:
 992                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 993                 break;
 994         case NETDEV_REGISTER:
 995                 /*
 996                  * NB: cannot take rdev->mtx here because this may be
 997                  * called within code protected by it when interfaces
 998                  * are added with nl80211.
 999                  */
1000                 mutex_init(&wdev->mtx);
1001                 INIT_LIST_HEAD(&wdev->event_list);
1002                 spin_lock_init(&wdev->event_lock);
1003                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1004                 spin_lock_init(&wdev->mgmt_registrations_lock);
1005
1006                 wdev->identifier = ++rdev->wdev_id;
1007                 list_add_rcu(&wdev->list, &rdev->wdev_list);
1008                 rdev->devlist_generation++;
1009                 /* can only change netns with wiphy */
1010                 dev->features |= NETIF_F_NETNS_LOCAL;
1011
1012                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1013                                       "phy80211")) {
1014                         pr_err("failed to add phy80211 symlink to netdev!\n");
1015                 }
1016                 wdev->netdev = dev;
1017 #ifdef CONFIG_CFG80211_WEXT
1018                 wdev->wext.default_key = -1;
1019                 wdev->wext.default_mgmt_key = -1;
1020                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1021 #endif
1022
1023                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1024                         wdev->ps = true;
1025                 else
1026                         wdev->ps = false;
1027                 /* allow mac80211 to determine the timeout */
1028                 wdev->ps_timeout = -1;
1029
1030                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1031                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1032                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1033                         dev->priv_flags |= IFF_DONT_BRIDGE;
1034                 break;
1035         case NETDEV_GOING_DOWN:
1036                 cfg80211_leave(rdev, wdev);
1037                 break;
1038         case NETDEV_DOWN:
1039                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1040                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1041                         if (WARN_ON(!rdev->scan_req->notified))
1042                                 rdev->scan_req->aborted = true;
1043                         ___cfg80211_scan_done(rdev, false);
1044                 }
1045
1046                 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1047                 if (WARN_ON(sched_scan_req &&
1048                             sched_scan_req->dev == wdev->netdev)) {
1049                         __cfg80211_stop_sched_scan(rdev, false);
1050                 }
1051
1052                 rdev->opencount--;
1053                 wake_up(&rdev->dev_wait);
1054                 break;
1055         case NETDEV_UP:
1056                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1057                 wdev_lock(wdev);
1058                 switch (wdev->iftype) {
1059 #ifdef CONFIG_CFG80211_WEXT
1060                 case NL80211_IFTYPE_ADHOC:
1061                         cfg80211_ibss_wext_join(rdev, wdev);
1062                         break;
1063                 case NL80211_IFTYPE_STATION:
1064                         cfg80211_mgd_wext_connect(rdev, wdev);
1065                         break;
1066 #endif
1067 #ifdef CONFIG_MAC80211_MESH
1068                 case NL80211_IFTYPE_MESH_POINT:
1069                         {
1070                                 /* backward compat code... */
1071                                 struct mesh_setup setup;
1072                                 memcpy(&setup, &default_mesh_setup,
1073                                                 sizeof(setup));
1074                                  /* back compat only needed for mesh_id */
1075                                 setup.mesh_id = wdev->ssid;
1076                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1077                                 if (wdev->mesh_id_up_len)
1078                                         __cfg80211_join_mesh(rdev, dev,
1079                                                         &setup,
1080                                                         &default_mesh_config);
1081                                 break;
1082                         }
1083 #endif
1084                 default:
1085                         break;
1086                 }
1087                 wdev_unlock(wdev);
1088                 rdev->opencount++;
1089
1090                 /*
1091                  * Configure power management to the driver here so that its
1092                  * correctly set also after interface type changes etc.
1093                  */
1094                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1095                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1096                     rdev->ops->set_power_mgmt)
1097                         if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
1098                                                 wdev->ps_timeout)) {
1099                                 /* assume this means it's off */
1100                                 wdev->ps = false;
1101                         }
1102                 break;
1103         case NETDEV_UNREGISTER:
1104                 /*
1105                  * It is possible to get NETDEV_UNREGISTER
1106                  * multiple times. To detect that, check
1107                  * that the interface is still on the list
1108                  * of registered interfaces, and only then
1109                  * remove and clean it up.
1110                  */
1111                 if (!list_empty(&wdev->list)) {
1112                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1113                         list_del_rcu(&wdev->list);
1114                         rdev->devlist_generation++;
1115                         cfg80211_mlme_purge_registrations(wdev);
1116 #ifdef CONFIG_CFG80211_WEXT
1117                         kzfree(wdev->wext.keys);
1118 #endif
1119                 }
1120                 /*
1121                  * synchronise (so that we won't find this netdev
1122                  * from other code any more) and then clear the list
1123                  * head so that the above code can safely check for
1124                  * !list_empty() to avoid double-cleanup.
1125                  */
1126                 synchronize_rcu();
1127                 INIT_LIST_HEAD(&wdev->list);
1128                 /*
1129                  * Ensure that all events have been processed and
1130                  * freed.
1131                  */
1132                 cfg80211_process_wdev_events(wdev);
1133
1134                 if (WARN_ON(wdev->current_bss)) {
1135                         cfg80211_unhold_bss(wdev->current_bss);
1136                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1137                         wdev->current_bss = NULL;
1138                 }
1139                 break;
1140         case NETDEV_PRE_UP:
1141                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1142                         return notifier_from_errno(-EOPNOTSUPP);
1143                 if (rfkill_blocked(rdev->rfkill))
1144                         return notifier_from_errno(-ERFKILL);
1145                 break;
1146         default:
1147                 return NOTIFY_DONE;
1148         }
1149
1150         wireless_nlevent_flush();
1151
1152         return NOTIFY_OK;
1153 }
1154
1155 static struct notifier_block cfg80211_netdev_notifier = {
1156         .notifier_call = cfg80211_netdev_notifier_call,
1157 };
1158
1159 static void __net_exit cfg80211_pernet_exit(struct net *net)
1160 {
1161         struct cfg80211_registered_device *rdev;
1162
1163         rtnl_lock();
1164         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1165                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1166                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1167         }
1168         rtnl_unlock();
1169 }
1170
1171 static struct pernet_operations cfg80211_pernet_ops = {
1172         .exit = cfg80211_pernet_exit,
1173 };
1174
1175 static int __init cfg80211_init(void)
1176 {
1177         int err;
1178
1179         err = register_pernet_device(&cfg80211_pernet_ops);
1180         if (err)
1181                 goto out_fail_pernet;
1182
1183         err = wiphy_sysfs_init();
1184         if (err)
1185                 goto out_fail_sysfs;
1186
1187         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1188         if (err)
1189                 goto out_fail_notifier;
1190
1191         err = nl80211_init();
1192         if (err)
1193                 goto out_fail_nl80211;
1194
1195         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1196
1197         err = regulatory_init();
1198         if (err)
1199                 goto out_fail_reg;
1200
1201         cfg80211_wq = create_singlethread_workqueue("cfg80211");
1202         if (!cfg80211_wq) {
1203                 err = -ENOMEM;
1204                 goto out_fail_wq;
1205         }
1206
1207         return 0;
1208
1209 out_fail_wq:
1210         regulatory_exit();
1211 out_fail_reg:
1212         debugfs_remove(ieee80211_debugfs_dir);
1213         nl80211_exit();
1214 out_fail_nl80211:
1215         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1216 out_fail_notifier:
1217         wiphy_sysfs_exit();
1218 out_fail_sysfs:
1219         unregister_pernet_device(&cfg80211_pernet_ops);
1220 out_fail_pernet:
1221         return err;
1222 }
1223 subsys_initcall(cfg80211_init);
1224
1225 static void __exit cfg80211_exit(void)
1226 {
1227         debugfs_remove(ieee80211_debugfs_dir);
1228         nl80211_exit();
1229         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1230         wiphy_sysfs_exit();
1231         regulatory_exit();
1232         unregister_pernet_device(&cfg80211_pernet_ops);
1233         destroy_workqueue(cfg80211_wq);
1234 }
1235 module_exit(cfg80211_exit);