net/wireless/core.c

   1 /*
   2  * This is the linux wireless configuration interface.
   3  *
   4  * Copyright 2006-2010          Johannes Berg <johannes@sipsolutions.net>
   5  * Copyright 2013-2014  Intel Mobile Communications GmbH
   6  * Copyright 2015       Intel Deutschland GmbH
   7  */
   8
   9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  10
  11 #include <linux/if.h>
  12 #include <linux/module.h>
  13 #include <linux/err.h>
  14 #include <linux/list.h>
  15 #include <linux/slab.h>
  16 #include <linux/nl80211.h>
  17 #include <linux/debugfs.h>
  18 #include <linux/notifier.h>
  19 #include <linux/device.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/sched.h>
  23 #include <net/genetlink.h>
  24 #include <net/cfg80211.h>
  25 #include "nl80211.h"
  26 #include "core.h"
  27 #include "sysfs.h"
  28 #include "debugfs.h"
  29 #include "wext-compat.h"
  30 #include "rdev-ops.h"
  31
  32 /* name for sysfs, %d is appended */
  33 #define PHY_NAME "phy"
  34
  35 MODULE_AUTHOR("Johannes Berg");
  36 MODULE_LICENSE("GPL");
  37 MODULE_DESCRIPTION("wireless configuration support");
  38 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
  39
  40 /* RCU-protected (and RTNL for writers) */
  41 LIST_HEAD(cfg80211_rdev_list);
  42 int cfg80211_rdev_list_generation;
  43
  44 /* for debugfs */
  45 static struct dentry *ieee80211_debugfs_dir;
  46
  47 /* for the cleanup, scan and event works */
  48 struct workqueue_struct *cfg80211_wq;
  49
  50 static bool cfg80211_disable_40mhz_24ghz;
  51 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  52 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  53                  "Disable 40MHz support in the 2.4GHz band");
  54
  55 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  56 {
  57         struct cfg80211_registered_device *result = NULL, *rdev;
  58
  59         ASSERT_RTNL();
  60
  61         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  62                 if (rdev->wiphy_idx == wiphy_idx) {
  63                         result = rdev;
  64                         break;
  65                 }
  66         }
  67
  68         return result;
  69 }
  70
  71 int get_wiphy_idx(struct wiphy *wiphy)
  72 {
  73         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
  74
  75         return rdev->wiphy_idx;
  76 }
  77
  78 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  79 {
  80         struct cfg80211_registered_device *rdev;
  81
  82         ASSERT_RTNL();
  83
  84         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  85         if (!rdev)
  86                 return NULL;
  87         return &rdev->wiphy;
  88 }
  89
  90 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
  91                                    const char *newname)
  92 {
  93         struct cfg80211_registered_device *rdev2;
  94         int wiphy_idx, taken = -1, digits;
  95
  96         ASSERT_RTNL();
  97
  98         /* prohibit calling the thing phy%d when %d is not its number */
  99         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 100         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 101                 /* count number of places needed to print wiphy_idx */
 102                 digits = 1;
 103                 while (wiphy_idx /= 10)
 104                         digits++;
 105                 /*
 106                  * deny the name if it is phy<idx> where <idx> is printed
 107                  * without leading zeroes. taken == strlen(newname) here
 108                  */
 109                 if (taken == strlen(PHY_NAME) + digits)
 110                         return -EINVAL;
 111         }
 112
 113         /* Ensure another device does not already have this name. */
 114         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 115                 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
 116                         return -EINVAL;
 117
 118         return 0;
 119 }
 120
 121 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 122                         char *newname)
 123 {
 124         int result;
 125
 126         ASSERT_RTNL();
 127
 128         /* Ignore nop renames */
 129         if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
 130                 return 0;
 131
 132         result = cfg80211_dev_check_name(rdev, newname);
 133         if (result < 0)
 134                 return result;
 135
 136         result = device_rename(&rdev->wiphy.dev, newname);
 137         if (result)
 138                 return result;
 139
 140         if (rdev->wiphy.debugfsdir &&
 141             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 142                             rdev->wiphy.debugfsdir,
 143                             rdev->wiphy.debugfsdir->d_parent,
 144                             newname))
 145                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 146
 147         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 148
 149         return 0;
 150 }
 151
 152 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 153                           struct net *net)
 154 {
 155         struct wireless_dev *wdev;
 156         int err = 0;
 157
 158         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 159                 return -EOPNOTSUPP;
 160
 161         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 162                 if (!wdev->netdev)
 163                         continue;
 164                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 165                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 166                 if (err)
 167                         break;
 168                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 169         }
 170
 171         if (err) {
 172                 /* failed -- clean up to old netns */
 173                 net = wiphy_net(&rdev->wiphy);
 174
 175                 list_for_each_entry_continue_reverse(wdev,
 176                                                      &rdev->wiphy.wdev_list,
 177                                                      list) {
 178                         if (!wdev->netdev)
 179                                 continue;
 180                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 181                         err = dev_change_net_namespace(wdev->netdev, net,
 182                                                         "wlan%d");
 183                         WARN_ON(err);
 184                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 185                 }
 186
 187                 return err;
 188         }
 189
 190         wiphy_net_set(&rdev->wiphy, net);
 191
 192         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 193         WARN_ON(err);
 194
 195         return 0;
 196 }
 197
 198 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 199 {
 200         struct cfg80211_registered_device *rdev = data;
 201
 202         rdev_rfkill_poll(rdev);
 203 }
 204
 205 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 206                               struct wireless_dev *wdev)
 207 {
 208         ASSERT_RTNL();
 209
 210         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 211                 return;
 212
 213         if (!wdev->p2p_started)
 214                 return;
 215
 216         rdev_stop_p2p_device(rdev, wdev);
 217         wdev->p2p_started = false;
 218
 219         rdev->opencount--;
 220
 221         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 222                 if (WARN_ON(!rdev->scan_req->notified))
 223                         rdev->scan_req->aborted = true;
 224                 ___cfg80211_scan_done(rdev, false);
 225         }
 226 }
 227
 228 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 229 {
 230         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 231         struct wireless_dev *wdev;
 232
 233         ASSERT_RTNL();
 234
 235         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 236                 if (wdev->netdev) {
 237                         dev_close(wdev->netdev);
 238                         continue;
 239                 }
 240                 /* otherwise, check iftype */
 241                 switch (wdev->iftype) {
 242                 case NL80211_IFTYPE_P2P_DEVICE:
 243                         cfg80211_stop_p2p_device(rdev, wdev);
 244                         break;
 245                 default:
 246                         break;
 247                 }
 248         }
 249 }
 250 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 251
 252 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 253 {
 254         struct cfg80211_registered_device *rdev = data;
 255
 256         if (!blocked)
 257                 return 0;
 258
 259         rtnl_lock();
 260         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 261         rtnl_unlock();
 262
 263         return 0;
 264 }
 265
 266 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 267 {
 268         struct cfg80211_registered_device *rdev;
 269
 270         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 271         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 272 }
 273
 274 static void cfg80211_event_work(struct work_struct *work)
 275 {
 276         struct cfg80211_registered_device *rdev;
 277
 278         rdev = container_of(work, struct cfg80211_registered_device,
 279                             event_work);
 280
 281         rtnl_lock();
 282         cfg80211_process_rdev_events(rdev);
 283         rtnl_unlock();
 284 }
 285
 286 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 287 {
 288         struct cfg80211_iface_destroy *item;
 289
 290         ASSERT_RTNL();
 291
 292         spin_lock_irq(&rdev->destroy_list_lock);
 293         while ((item = list_first_entry_or_null(&rdev->destroy_list,
 294                                                 struct cfg80211_iface_destroy,
 295                                                 list))) {
 296                 struct wireless_dev *wdev, *tmp;
 297                 u32 nlportid = item->nlportid;
 298
 299                 list_del(&item->list);
 300                 kfree(item);
 301                 spin_unlock_irq(&rdev->destroy_list_lock);
 302
 303                 list_for_each_entry_safe(wdev, tmp,
 304                                          &rdev->wiphy.wdev_list, list) {
 305                         if (nlportid == wdev->owner_nlportid)
 306                                 rdev_del_virtual_intf(rdev, wdev);
 307                 }
 308
 309                 spin_lock_irq(&rdev->destroy_list_lock);
 310         }
 311         spin_unlock_irq(&rdev->destroy_list_lock);
 312 }
 313
 314 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 315 {
 316         struct cfg80211_registered_device *rdev;
 317
 318         rdev = container_of(work, struct cfg80211_registered_device,
 319                             destroy_work);
 320
 321         rtnl_lock();
 322         cfg80211_destroy_ifaces(rdev);
 323         rtnl_unlock();
 324 }
 325
 326 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
 327 {
 328         struct cfg80211_registered_device *rdev;
 329
 330         rdev = container_of(work, struct cfg80211_registered_device,
 331                            sched_scan_stop_wk);
 332
 333         rtnl_lock();
 334
 335         __cfg80211_stop_sched_scan(rdev, false);
 336
 337         rtnl_unlock();
 338 }
 339
 340 /* exported functions */
 341
 342 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 343                            const char *requested_name)
 344 {
 345         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 346
 347         struct cfg80211_registered_device *rdev;
 348         int alloc_size;
 349
 350         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 351         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 352         WARN_ON(ops->connect && !ops->disconnect);
 353         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 354         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 355         WARN_ON(ops->add_station && !ops->del_station);
 356         WARN_ON(ops->add_mpath && !ops->del_mpath);
 357         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 358         WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
 359         WARN_ON(ops->start_ap && !ops->stop_ap);
 360         WARN_ON(ops->join_ocb && !ops->leave_ocb);
 361         WARN_ON(ops->suspend && !ops->resume);
 362         WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
 363         WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
 364         WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
 365         WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
 366
 367         alloc_size = sizeof(*rdev) + sizeof_priv;
 368
 369         rdev = kzalloc(alloc_size, GFP_KERNEL);
 370         if (!rdev)
 371                 return NULL;
 372
 373         rdev->ops = ops;
 374
 375         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 376
 377         if (unlikely(rdev->wiphy_idx < 0)) {
 378                 /* ugh, wrapped! */
 379                 atomic_dec(&wiphy_counter);
 380                 kfree(rdev);
 381                 return NULL;
 382         }
 383
 384         /* atomic_inc_return makes it start at 1, make it start at 0 */
 385         rdev->wiphy_idx--;
 386
 387         /* give it a proper name */
 388         if (requested_name && requested_name[0]) {
 389                 int rv;
 390
 391                 rtnl_lock();
 392                 rv = cfg80211_dev_check_name(rdev, requested_name);
 393
 394                 if (rv < 0) {
 395                         rtnl_unlock();
 396                         goto use_default_name;
 397                 }
 398
 399                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 400                 rtnl_unlock();
 401                 if (rv)
 402                         goto use_default_name;
 403         } else {
 404 use_default_name:
 405                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 406                  * the restrictions on phy names.  Probably this call could
 407                  * fail if some other part of the kernel (re)named a device
 408                  * phyX.  But, might should add some locking and check return
 409                  * value, and use a different name if this one exists?
 410                  */
 411                 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 412         }
 413
 414         INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
 415         INIT_LIST_HEAD(&rdev->beacon_registrations);
 416         spin_lock_init(&rdev->beacon_registrations_lock);
 417         spin_lock_init(&rdev->bss_lock);
 418         INIT_LIST_HEAD(&rdev->bss_list);
 419         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 420         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 421         INIT_LIST_HEAD(&rdev->mlme_unreg);
 422         spin_lock_init(&rdev->mlme_unreg_lock);
 423         INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
 424         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 425                           cfg80211_dfs_channels_update_work);
 426 #ifdef CONFIG_CFG80211_WEXT
 427         rdev->wiphy.wext = &cfg80211_wext_handler;
 428 #endif
 429
 430         device_initialize(&rdev->wiphy.dev);
 431         rdev->wiphy.dev.class = &ieee80211_class;
 432         rdev->wiphy.dev.platform_data = rdev;
 433         device_enable_async_suspend(&rdev->wiphy.dev);
 434
 435         INIT_LIST_HEAD(&rdev->destroy_list);
 436         spin_lock_init(&rdev->destroy_list_lock);
 437         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 438         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 439
 440 #ifdef CONFIG_CFG80211_DEFAULT_PS
 441         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 442 #endif
 443
 444         wiphy_net_set(&rdev->wiphy, &init_net);
 445
 446         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 447         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 448                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 449                                    &rdev->rfkill_ops, rdev);
 450
 451         if (!rdev->rfkill) {
 452                 kfree(rdev);
 453                 return NULL;
 454         }
 455
 456         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 457         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 458         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 459
 460         init_waitqueue_head(&rdev->dev_wait);
 461
 462         /*
 463          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 464          * Fragmentation and RTS threshold are disabled by default with the
 465          * special -1 value.
 466          */
 467         rdev->wiphy.retry_short = 7;
 468         rdev->wiphy.retry_long = 4;
 469         rdev->wiphy.frag_threshold = (u32) -1;
 470         rdev->wiphy.rts_threshold = (u32) -1;
 471         rdev->wiphy.coverage_class = 0;
 472
 473         rdev->wiphy.max_num_csa_counters = 1;
 474
 475         rdev->wiphy.max_sched_scan_plans = 1;
 476         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 477
 478         return &rdev->wiphy;
 479 }
 480 EXPORT_SYMBOL(wiphy_new_nm);
 481
 482 static int wiphy_verify_combinations(struct wiphy *wiphy)
 483 {
 484         const struct ieee80211_iface_combination *c;
 485         int i, j;
 486
 487         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 488                 u32 cnt = 0;
 489                 u16 all_iftypes = 0;
 490
 491                 c = &wiphy->iface_combinations[i];
 492
 493                 /*
 494                  * Combinations with just one interface aren't real,
 495                  * however we make an exception for DFS.
 496                  */
 497                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 498                         return -EINVAL;
 499
 500                 /* Need at least one channel */
 501                 if (WARN_ON(!c->num_different_channels))
 502                         return -EINVAL;
 503
 504                 /*
 505                  * Put a sane limit on maximum number of different
 506                  * channels to simplify channel accounting code.
 507                  */
 508                 if (WARN_ON(c->num_different_channels >
 509                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 510                         return -EINVAL;
 511
 512                 /* DFS only works on one channel. */
 513                 if (WARN_ON(c->radar_detect_widths &&
 514                             (c->num_different_channels > 1)))
 515                         return -EINVAL;
 516
 517                 if (WARN_ON(!c->n_limits))
 518                         return -EINVAL;
 519
 520                 for (j = 0; j < c->n_limits; j++) {
 521                         u16 types = c->limits[j].types;
 522
 523                         /* interface types shouldn't overlap */
 524                         if (WARN_ON(types & all_iftypes))
 525                                 return -EINVAL;
 526                         all_iftypes |= types;
 527
 528                         if (WARN_ON(!c->limits[j].max))
 529                                 return -EINVAL;
 530
 531                         /* Shouldn't list software iftypes in combinations! */
 532                         if (WARN_ON(wiphy->software_iftypes & types))
 533                                 return -EINVAL;
 534
 535                         /* Only a single P2P_DEVICE can be allowed */
 536                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 537                                     c->limits[j].max > 1))
 538                                 return -EINVAL;
 539
 540                         cnt += c->limits[j].max;
 541                         /*
 542                          * Don't advertise an unsupported type
 543                          * in a combination.
 544                          */
 545                         if (WARN_ON((wiphy->interface_modes & types) != types))
 546                                 return -EINVAL;
 547                 }
 548
 549                 /* You can't even choose that many! */
 550                 if (WARN_ON(cnt < c->max_interfaces))
 551                         return -EINVAL;
 552         }
 553
 554         return 0;
 555 }
 556
 557 int wiphy_register(struct wiphy *wiphy)
 558 {
 559         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 560         int res;
 561         enum nl80211_band band;
 562         struct ieee80211_supported_band *sband;
 563         bool have_band = false;
 564         int i;
 565         u16 ifmodes = wiphy->interface_modes;
 566
 567 #ifdef CONFIG_PM
 568         if (WARN_ON(wiphy->wowlan &&
 569                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 570                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 571                 return -EINVAL;
 572         if (WARN_ON(wiphy->wowlan &&
 573                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 574                     !wiphy->wowlan->tcp))
 575                 return -EINVAL;
 576 #endif
 577         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 578                     (!rdev->ops->tdls_channel_switch ||
 579                      !rdev->ops->tdls_cancel_channel_switch)))
 580                 return -EINVAL;
 581
 582         /*
 583          * if a wiphy has unsupported modes for regulatory channel enforcement,
 584          * opt-out of enforcement checking
 585          */
 586         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 587                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 588                                        BIT(NL80211_IFTYPE_AP) |
 589                                        BIT(NL80211_IFTYPE_P2P_GO) |
 590                                        BIT(NL80211_IFTYPE_ADHOC) |
 591                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 592                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 593                                        BIT(NL80211_IFTYPE_MONITOR)))
 594                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 595
 596         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 597                     (wiphy->regulatory_flags &
 598                                         (REGULATORY_CUSTOM_REG |
 599                                          REGULATORY_STRICT_REG |
 600                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 601                                          REGULATORY_COUNTRY_IE_IGNORE))))
 602                 return -EINVAL;
 603
 604         if (WARN_ON(wiphy->coalesce &&
 605                     (!wiphy->coalesce->n_rules ||
 606                      !wiphy->coalesce->n_patterns) &&
 607                     (!wiphy->coalesce->pattern_min_len ||
 608                      wiphy->coalesce->pattern_min_len >
 609                         wiphy->coalesce->pattern_max_len)))
 610                 return -EINVAL;
 611
 612         if (WARN_ON(wiphy->ap_sme_capa &&
 613                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 614                 return -EINVAL;
 615
 616         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 617                 return -EINVAL;
 618
 619         if (WARN_ON(wiphy->addresses &&
 620                     !is_zero_ether_addr(wiphy->perm_addr) &&
 621                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 622                            ETH_ALEN)))
 623                 return -EINVAL;
 624
 625         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 626                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 627                      !rdev->ops->set_mac_acl)))
 628                 return -EINVAL;
 629
 630         /* assure only valid behaviours are flagged by driver
 631          * hence subtract 2 as bit 0 is invalid.
 632          */
 633         if (WARN_ON(wiphy->bss_select_support &&
 634                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 635                 return -EINVAL;
 636
 637         if (wiphy->addresses)
 638                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 639
 640         /* sanity check ifmodes */
 641         WARN_ON(!ifmodes);
 642         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 643         if (WARN_ON(ifmodes != wiphy->interface_modes))
 644                 wiphy->interface_modes = ifmodes;
 645
 646         res = wiphy_verify_combinations(wiphy);
 647         if (res)
 648                 return res;
 649
 650         /* sanity check supported bands/channels */
 651         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 652                 sband = wiphy->bands[band];
 653                 if (!sband)
 654                         continue;
 655
 656                 sband->band = band;
 657                 if (WARN_ON(!sband->n_channels))
 658                         return -EINVAL;
 659                 /*
 660                  * on 60GHz band, there are no legacy rates, so
 661                  * n_bitrates is 0
 662                  */
 663                 if (WARN_ON(band != NL80211_BAND_60GHZ &&
 664                             !sband->n_bitrates))
 665                         return -EINVAL;
 666
 667                 /*
 668                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 669                  * modify the sband's ht data even if the driver uses a
 670                  * global structure for that.
 671                  */
 672                 if (cfg80211_disable_40mhz_24ghz &&
 673                     band == NL80211_BAND_2GHZ &&
 674                     sband->ht_cap.ht_supported) {
 675                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 676                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 677                 }
 678
 679                 /*
 680                  * Since we use a u32 for rate bitmaps in
 681                  * ieee80211_get_response_rate, we cannot
 682                  * have more than 32 legacy rates.
 683                  */
 684                 if (WARN_ON(sband->n_bitrates > 32))
 685                         return -EINVAL;
 686
 687                 for (i = 0; i < sband->n_channels; i++) {
 688                         sband->channels[i].orig_flags =
 689                                 sband->channels[i].flags;
 690                         sband->channels[i].orig_mag = INT_MAX;
 691                         sband->channels[i].orig_mpwr =
 692                                 sband->channels[i].max_power;
 693                         sband->channels[i].band = band;
 694                 }
 695
 696                 have_band = true;
 697         }
 698
 699         if (!have_band) {
 700                 WARN_ON(1);
 701                 return -EINVAL;
 702         }
 703
 704 #ifdef CONFIG_PM
 705         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 706                     (!rdev->wiphy.wowlan->pattern_min_len ||
 707                      rdev->wiphy.wowlan->pattern_min_len >
 708                                 rdev->wiphy.wowlan->pattern_max_len)))
 709                 return -EINVAL;
 710 #endif
 711
 712         /* check and set up bitrates */
 713         ieee80211_set_bitrate_flags(wiphy);
 714
 715         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 716
 717         rtnl_lock();
 718         res = device_add(&rdev->wiphy.dev);
 719         if (res) {
 720                 rtnl_unlock();
 721                 return res;
 722         }
 723
 724         /* set up regulatory info */
 725         wiphy_regulatory_register(wiphy);
 726
 727         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 728         cfg80211_rdev_list_generation++;
 729
 730         /* add to debugfs */
 731         rdev->wiphy.debugfsdir =
 732                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 733                                    ieee80211_debugfs_dir);
 734         if (IS_ERR(rdev->wiphy.debugfsdir))
 735                 rdev->wiphy.debugfsdir = NULL;
 736
 737         cfg80211_debugfs_rdev_add(rdev);
 738         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 739
 740         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 741                 struct regulatory_request request;
 742
 743                 request.wiphy_idx = get_wiphy_idx(wiphy);
 744                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 745                 request.alpha2[0] = '9';
 746                 request.alpha2[1] = '9';
 747
 748                 nl80211_send_reg_change_event(&request);
 749         }
 750
 751         rdev->wiphy.registered = true;
 752         rtnl_unlock();
 753
 754         res = rfkill_register(rdev->rfkill);
 755         if (res) {
 756                 rfkill_destroy(rdev->rfkill);
 757                 rdev->rfkill = NULL;
 758                 wiphy_unregister(&rdev->wiphy);
 759                 return res;
 760         }
 761
 762         return 0;
 763 }
 764 EXPORT_SYMBOL(wiphy_register);
 765
 766 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 767 {
 768         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 769
 770         if (!rdev->ops->rfkill_poll)
 771                 return;
 772         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 773         rfkill_resume_polling(rdev->rfkill);
 774 }
 775 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 776
 777 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 778 {
 779         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 780
 781         rfkill_pause_polling(rdev->rfkill);
 782 }
 783 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 784
 785 void wiphy_unregister(struct wiphy *wiphy)
 786 {
 787         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 788
 789         wait_event(rdev->dev_wait, ({
 790                 int __count;
 791                 rtnl_lock();
 792                 __count = rdev->opencount;
 793                 rtnl_unlock();
 794                 __count == 0; }));
 795
 796         if (rdev->rfkill)
 797                 rfkill_unregister(rdev->rfkill);
 798
 799         rtnl_lock();
 800         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 801         rdev->wiphy.registered = false;
 802
 803         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
 804
 805         /*
 806          * First remove the hardware from everywhere, this makes
 807          * it impossible to find from userspace.
 808          */
 809         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 810         list_del_rcu(&rdev->list);
 811         synchronize_rcu();
 812
 813         /*
 814          * If this device got a regulatory hint tell core its
 815          * free to listen now to a new shiny device regulatory hint
 816          */
 817         wiphy_regulatory_deregister(wiphy);
 818
 819         cfg80211_rdev_list_generation++;
 820         device_del(&rdev->wiphy.dev);
 821
 822         rtnl_unlock();
 823
 824         flush_work(&rdev->scan_done_wk);
 825         cancel_work_sync(&rdev->conn_work);
 826         flush_work(&rdev->event_work);
 827         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 828         flush_work(&rdev->destroy_work);
 829         flush_work(&rdev->sched_scan_stop_wk);
 830         flush_work(&rdev->mlme_unreg_wk);
 831
 832 #ifdef CONFIG_PM
 833         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
 834                 rdev_set_wakeup(rdev, false);
 835 #endif
 836         cfg80211_rdev_free_wowlan(rdev);
 837         cfg80211_rdev_free_coalesce(rdev);
 838 }
 839 EXPORT_SYMBOL(wiphy_unregister);
 840
 841 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 842 {
 843         struct cfg80211_internal_bss *scan, *tmp;
 844         struct cfg80211_beacon_registration *reg, *treg;
 845         rfkill_destroy(rdev->rfkill);
 846         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 847                 list_del(&reg->list);
 848                 kfree(reg);
 849         }
 850         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 851                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 852         kfree(rdev);
 853 }
 854
 855 void wiphy_free(struct wiphy *wiphy)
 856 {
 857         put_device(&wiphy->dev);
 858 }
 859 EXPORT_SYMBOL(wiphy_free);
 860
 861 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 862 {
 863         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 864
 865         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 866                 schedule_work(&rdev->rfkill_sync);
 867 }
 868 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 869
 870 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 871 {
 872         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 873
 874         ASSERT_RTNL();
 875
 876         if (WARN_ON(wdev->netdev))
 877                 return;
 878
 879         list_del_rcu(&wdev->list);
 880         rdev->devlist_generation++;
 881
 882         switch (wdev->iftype) {
 883         case NL80211_IFTYPE_P2P_DEVICE:
 884                 cfg80211_mlme_purge_registrations(wdev);
 885                 cfg80211_stop_p2p_device(rdev, wdev);
 886                 break;
 887         default:
 888                 WARN_ON_ONCE(1);
 889                 break;
 890         }
 891 }
 892 EXPORT_SYMBOL(cfg80211_unregister_wdev);
 893
 894 static const struct device_type wiphy_type = {
 895         .name   = "wlan",
 896 };
 897
 898 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 899                                enum nl80211_iftype iftype, int num)
 900 {
 901         ASSERT_RTNL();
 902
 903         rdev->num_running_ifaces += num;
 904         if (iftype == NL80211_IFTYPE_MONITOR)
 905                 rdev->num_running_monitor_ifaces += num;
 906 }
 907
 908 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
 909                       struct wireless_dev *wdev)
 910 {
 911         struct net_device *dev = wdev->netdev;
 912         struct cfg80211_sched_scan_request *sched_scan_req;
 913
 914         ASSERT_RTNL();
 915         ASSERT_WDEV_LOCK(wdev);
 916
 917         switch (wdev->iftype) {
 918         case NL80211_IFTYPE_ADHOC:
 919                 __cfg80211_leave_ibss(rdev, dev, true);
 920                 break;
 921         case NL80211_IFTYPE_P2P_CLIENT:
 922         case NL80211_IFTYPE_STATION:
 923                 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
 924                 if (sched_scan_req && dev == sched_scan_req->dev)
 925                         __cfg80211_stop_sched_scan(rdev, false);
 926
 927 #ifdef CONFIG_CFG80211_WEXT
 928                 kfree(wdev->wext.ie);
 929                 wdev->wext.ie = NULL;
 930                 wdev->wext.ie_len = 0;
 931                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 932 #endif
 933                 cfg80211_disconnect(rdev, dev,
 934                                     WLAN_REASON_DEAUTH_LEAVING, true);
 935                 break;
 936         case NL80211_IFTYPE_MESH_POINT:
 937                 __cfg80211_leave_mesh(rdev, dev);
 938                 break;
 939         case NL80211_IFTYPE_AP:
 940         case NL80211_IFTYPE_P2P_GO:
 941                 __cfg80211_stop_ap(rdev, dev, true);
 942                 break;
 943         case NL80211_IFTYPE_OCB:
 944                 __cfg80211_leave_ocb(rdev, dev);
 945                 break;
 946         case NL80211_IFTYPE_WDS:
 947                 /* must be handled by mac80211/driver, has no APIs */
 948                 break;
 949         case NL80211_IFTYPE_P2P_DEVICE:
 950                 /* cannot happen, has no netdev */
 951                 break;
 952         case NL80211_IFTYPE_AP_VLAN:
 953         case NL80211_IFTYPE_MONITOR:
 954                 /* nothing to do */
 955                 break;
 956         case NL80211_IFTYPE_UNSPECIFIED:
 957         case NUM_NL80211_IFTYPES:
 958                 /* invalid */
 959                 break;
 960         }
 961 }
 962
 963 void cfg80211_leave(struct cfg80211_registered_device *rdev,
 964                     struct wireless_dev *wdev)
 965 {
 966         wdev_lock(wdev);
 967         __cfg80211_leave(rdev, wdev);
 968         wdev_unlock(wdev);
 969 }
 970
 971 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
 972                          gfp_t gfp)
 973 {
 974         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 975         struct cfg80211_event *ev;
 976         unsigned long flags;
 977
 978         trace_cfg80211_stop_iface(wiphy, wdev);
 979
 980         ev = kzalloc(sizeof(*ev), gfp);
 981         if (!ev)
 982                 return;
 983
 984         ev->type = EVENT_STOPPED;
 985
 986         spin_lock_irqsave(&wdev->event_lock, flags);
 987         list_add_tail(&ev->list, &wdev->event_list);
 988         spin_unlock_irqrestore(&wdev->event_lock, flags);
 989         queue_work(cfg80211_wq, &rdev->event_work);
 990 }
 991 EXPORT_SYMBOL(cfg80211_stop_iface);
 992
 993 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 994                                          unsigned long state, void *ptr)
 995 {
 996         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 997         struct wireless_dev *wdev = dev->ieee80211_ptr;
 998         struct cfg80211_registered_device *rdev;
 999         struct cfg80211_sched_scan_request *sched_scan_req;
1000
1001         if (!wdev)
1002                 return NOTIFY_DONE;
1003
1004         rdev = wiphy_to_rdev(wdev->wiphy);
1005
1006         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1007
1008         switch (state) {
1009         case NETDEV_POST_INIT:
1010                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1011                 break;
1012         case NETDEV_REGISTER:
1013                 /*
1014                  * NB: cannot take rdev->mtx here because this may be
1015                  * called within code protected by it when interfaces
1016                  * are added with nl80211.
1017                  */
1018                 mutex_init(&wdev->mtx);
1019                 INIT_LIST_HEAD(&wdev->event_list);
1020                 spin_lock_init(&wdev->event_lock);
1021                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1022                 spin_lock_init(&wdev->mgmt_registrations_lock);
1023
1024                 wdev->identifier = ++rdev->wdev_id;
1025                 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1026                 rdev->devlist_generation++;
1027                 /* can only change netns with wiphy */
1028                 dev->features |= NETIF_F_NETNS_LOCAL;
1029
1030                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1031                                       "phy80211")) {
1032                         pr_err("failed to add phy80211 symlink to netdev!\n");
1033                 }
1034                 wdev->netdev = dev;
1035 #ifdef CONFIG_CFG80211_WEXT
1036                 wdev->wext.default_key = -1;
1037                 wdev->wext.default_mgmt_key = -1;
1038                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1039 #endif
1040
1041                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1042                         wdev->ps = true;
1043                 else
1044                         wdev->ps = false;
1045                 /* allow mac80211 to determine the timeout */
1046                 wdev->ps_timeout = -1;
1047
1048                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1049                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1050                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1051                         dev->priv_flags |= IFF_DONT_BRIDGE;
1052                 break;
1053         case NETDEV_GOING_DOWN:
1054                 cfg80211_leave(rdev, wdev);
1055                 break;
1056         case NETDEV_DOWN:
1057                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1058                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1059                         if (WARN_ON(!rdev->scan_req->notified))
1060                                 rdev->scan_req->aborted = true;
1061                         ___cfg80211_scan_done(rdev, false);
1062                 }
1063
1064                 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1065                 if (WARN_ON(sched_scan_req &&
1066                             sched_scan_req->dev == wdev->netdev)) {
1067                         __cfg80211_stop_sched_scan(rdev, false);
1068                 }
1069
1070                 rdev->opencount--;
1071                 wake_up(&rdev->dev_wait);
1072                 break;
1073         case NETDEV_UP:
1074                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1075                 wdev_lock(wdev);
1076                 switch (wdev->iftype) {
1077 #ifdef CONFIG_CFG80211_WEXT
1078                 case NL80211_IFTYPE_ADHOC:
1079                         cfg80211_ibss_wext_join(rdev, wdev);
1080                         break;
1081                 case NL80211_IFTYPE_STATION:
1082                         cfg80211_mgd_wext_connect(rdev, wdev);
1083                         break;
1084 #endif
1085 #ifdef CONFIG_MAC80211_MESH
1086                 case NL80211_IFTYPE_MESH_POINT:
1087                         {
1088                                 /* backward compat code... */
1089                                 struct mesh_setup setup;
1090                                 memcpy(&setup, &default_mesh_setup,
1091                                                 sizeof(setup));
1092                                  /* back compat only needed for mesh_id */
1093                                 setup.mesh_id = wdev->ssid;
1094                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1095                                 if (wdev->mesh_id_up_len)
1096                                         __cfg80211_join_mesh(rdev, dev,
1097                                                         &setup,
1098                                                         &default_mesh_config);
1099                                 break;
1100                         }
1101 #endif
1102                 default:
1103                         break;
1104                 }
1105                 wdev_unlock(wdev);
1106                 rdev->opencount++;
1107
1108                 /*
1109                  * Configure power management to the driver here so that its
1110                  * correctly set also after interface type changes etc.
1111                  */
1112                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1113                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1114                     rdev->ops->set_power_mgmt)
1115                         if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
1116                                                 wdev->ps_timeout)) {
1117                                 /* assume this means it's off */
1118                                 wdev->ps = false;
1119                         }
1120                 break;
1121         case NETDEV_UNREGISTER:
1122                 /*
1123                  * It is possible to get NETDEV_UNREGISTER
1124                  * multiple times. To detect that, check
1125                  * that the interface is still on the list
1126                  * of registered interfaces, and only then
1127                  * remove and clean it up.
1128                  */
1129                 if (!list_empty(&wdev->list)) {
1130                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1131                         list_del_rcu(&wdev->list);
1132                         rdev->devlist_generation++;
1133                         cfg80211_mlme_purge_registrations(wdev);
1134 #ifdef CONFIG_CFG80211_WEXT
1135                         kzfree(wdev->wext.keys);
1136 #endif
1137                 }
1138                 /*
1139                  * synchronise (so that we won't find this netdev
1140                  * from other code any more) and then clear the list
1141                  * head so that the above code can safely check for
1142                  * !list_empty() to avoid double-cleanup.
1143                  */
1144                 synchronize_rcu();
1145                 INIT_LIST_HEAD(&wdev->list);
1146                 /*
1147                  * Ensure that all events have been processed and
1148                  * freed.
1149                  */
1150                 cfg80211_process_wdev_events(wdev);
1151
1152                 if (WARN_ON(wdev->current_bss)) {
1153                         cfg80211_unhold_bss(wdev->current_bss);
1154                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1155                         wdev->current_bss = NULL;
1156                 }
1157                 break;
1158         case NETDEV_PRE_UP:
1159                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1160                         return notifier_from_errno(-EOPNOTSUPP);
1161                 if (rfkill_blocked(rdev->rfkill))
1162                         return notifier_from_errno(-ERFKILL);
1163                 break;
1164         default:
1165                 return NOTIFY_DONE;
1166         }
1167
1168         wireless_nlevent_flush();
1169
1170         return NOTIFY_OK;
1171 }
1172
1173 static struct notifier_block cfg80211_netdev_notifier = {
1174         .notifier_call = cfg80211_netdev_notifier_call,
1175 };
1176
1177 static void __net_exit cfg80211_pernet_exit(struct net *net)
1178 {
1179         struct cfg80211_registered_device *rdev;
1180
1181         rtnl_lock();
1182         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1183                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1184                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1185         }
1186         rtnl_unlock();
1187 }
1188
1189 static struct pernet_operations cfg80211_pernet_ops = {
1190         .exit = cfg80211_pernet_exit,
1191 };
1192
1193 static int __init cfg80211_init(void)
1194 {
1195         int err;
1196
1197         err = register_pernet_device(&cfg80211_pernet_ops);
1198         if (err)
1199                 goto out_fail_pernet;
1200
1201         err = wiphy_sysfs_init();
1202         if (err)
1203                 goto out_fail_sysfs;
1204
1205         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1206         if (err)
1207                 goto out_fail_notifier;
1208
1209         err = nl80211_init();
1210         if (err)
1211                 goto out_fail_nl80211;
1212
1213         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1214
1215         err = regulatory_init();
1216         if (err)
1217                 goto out_fail_reg;
1218
1219         cfg80211_wq = create_singlethread_workqueue("cfg80211");
1220         if (!cfg80211_wq) {
1221                 err = -ENOMEM;
1222                 goto out_fail_wq;
1223         }
1224
1225         return 0;
1226
1227 out_fail_wq:
1228         regulatory_exit();
1229 out_fail_reg:
1230         debugfs_remove(ieee80211_debugfs_dir);
1231         nl80211_exit();
1232 out_fail_nl80211:
1233         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1234 out_fail_notifier:
1235         wiphy_sysfs_exit();
1236 out_fail_sysfs:
1237         unregister_pernet_device(&cfg80211_pernet_ops);
1238 out_fail_pernet:
1239         return err;
1240 }
1241 subsys_initcall(cfg80211_init);
1242
1243 static void __exit cfg80211_exit(void)
1244 {
1245         debugfs_remove(ieee80211_debugfs_dir);
1246         nl80211_exit();
1247         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1248         wiphy_sysfs_exit();
1249         regulatory_exit();
1250         unregister_pernet_device(&cfg80211_pernet_ops);
1251         destroy_workqueue(cfg80211_wq);
1252 }
1253 module_exit(cfg80211_exit);