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         if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
  99                 return -EINVAL;
 100
 101         /* prohibit calling the thing phy%d when %d is not its number */
 102         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 103         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 104                 /* count number of places needed to print wiphy_idx */
 105                 digits = 1;
 106                 while (wiphy_idx /= 10)
 107                         digits++;
 108                 /*
 109                  * deny the name if it is phy<idx> where <idx> is printed
 110                  * without leading zeroes. taken == strlen(newname) here
 111                  */
 112                 if (taken == strlen(PHY_NAME) + digits)
 113                         return -EINVAL;
 114         }
 115
 116         /* Ensure another device does not already have this name. */
 117         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 118                 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
 119                         return -EINVAL;
 120
 121         return 0;
 122 }
 123
 124 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 125                         char *newname)
 126 {
 127         int result;
 128
 129         ASSERT_RTNL();
 130
 131         /* Ignore nop renames */
 132         if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
 133                 return 0;
 134
 135         result = cfg80211_dev_check_name(rdev, newname);
 136         if (result < 0)
 137                 return result;
 138
 139         result = device_rename(&rdev->wiphy.dev, newname);
 140         if (result)
 141                 return result;
 142
 143         if (rdev->wiphy.debugfsdir &&
 144             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 145                             rdev->wiphy.debugfsdir,
 146                             rdev->wiphy.debugfsdir->d_parent,
 147                             newname))
 148                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 149
 150         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 151
 152         return 0;
 153 }
 154
 155 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 156                           struct net *net)
 157 {
 158         struct wireless_dev *wdev;
 159         int err = 0;
 160
 161         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 162                 return -EOPNOTSUPP;
 163
 164         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 165                 if (!wdev->netdev)
 166                         continue;
 167                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 168                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 169                 if (err)
 170                         break;
 171                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 172         }
 173
 174         if (err) {
 175                 /* failed -- clean up to old netns */
 176                 net = wiphy_net(&rdev->wiphy);
 177
 178                 list_for_each_entry_continue_reverse(wdev,
 179                                                      &rdev->wiphy.wdev_list,
 180                                                      list) {
 181                         if (!wdev->netdev)
 182                                 continue;
 183                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 184                         err = dev_change_net_namespace(wdev->netdev, net,
 185                                                         "wlan%d");
 186                         WARN_ON(err);
 187                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 188                 }
 189
 190                 return err;
 191         }
 192
 193         wiphy_net_set(&rdev->wiphy, net);
 194
 195         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 196         WARN_ON(err);
 197
 198         return 0;
 199 }
 200
 201 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 202 {
 203         struct cfg80211_registered_device *rdev = data;
 204
 205         rdev_rfkill_poll(rdev);
 206 }
 207
 208 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 209                               struct wireless_dev *wdev)
 210 {
 211         ASSERT_RTNL();
 212
 213         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 214                 return;
 215
 216         if (!wdev->p2p_started)
 217                 return;
 218
 219         rdev_stop_p2p_device(rdev, wdev);
 220         wdev->p2p_started = false;
 221
 222         rdev->opencount--;
 223
 224         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 225                 if (WARN_ON(!rdev->scan_req->notified))
 226                         rdev->scan_req->info.aborted = true;
 227                 ___cfg80211_scan_done(rdev, false);
 228         }
 229 }
 230
 231 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
 232                        struct wireless_dev *wdev)
 233 {
 234         ASSERT_RTNL();
 235
 236         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
 237                 return;
 238
 239         if (!wdev->nan_started)
 240                 return;
 241
 242         rdev_stop_nan(rdev, wdev);
 243         wdev->nan_started = false;
 244
 245         rdev->opencount--;
 246 }
 247
 248 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 249 {
 250         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 251         struct wireless_dev *wdev;
 252
 253         ASSERT_RTNL();
 254
 255         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 256                 if (wdev->netdev) {
 257                         dev_close(wdev->netdev);
 258                         continue;
 259                 }
 260                 /* otherwise, check iftype */
 261                 switch (wdev->iftype) {
 262                 case NL80211_IFTYPE_P2P_DEVICE:
 263                         cfg80211_stop_p2p_device(rdev, wdev);
 264                         break;
 265                 case NL80211_IFTYPE_NAN:
 266                         cfg80211_stop_nan(rdev, wdev);
 267                         break;
 268                 default:
 269                         break;
 270                 }
 271         }
 272 }
 273 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 274
 275 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 276 {
 277         struct cfg80211_registered_device *rdev = data;
 278
 279         if (!blocked)
 280                 return 0;
 281
 282         rtnl_lock();
 283         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 284         rtnl_unlock();
 285
 286         return 0;
 287 }
 288
 289 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 290 {
 291         struct cfg80211_registered_device *rdev;
 292
 293         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 294         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 295 }
 296
 297 static void cfg80211_event_work(struct work_struct *work)
 298 {
 299         struct cfg80211_registered_device *rdev;
 300
 301         rdev = container_of(work, struct cfg80211_registered_device,
 302                             event_work);
 303
 304         rtnl_lock();
 305         cfg80211_process_rdev_events(rdev);
 306         rtnl_unlock();
 307 }
 308
 309 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 310 {
 311         struct cfg80211_iface_destroy *item;
 312
 313         ASSERT_RTNL();
 314
 315         spin_lock_irq(&rdev->destroy_list_lock);
 316         while ((item = list_first_entry_or_null(&rdev->destroy_list,
 317                                                 struct cfg80211_iface_destroy,
 318                                                 list))) {
 319                 struct wireless_dev *wdev, *tmp;
 320                 u32 nlportid = item->nlportid;
 321
 322                 list_del(&item->list);
 323                 kfree(item);
 324                 spin_unlock_irq(&rdev->destroy_list_lock);
 325
 326                 list_for_each_entry_safe(wdev, tmp,
 327                                          &rdev->wiphy.wdev_list, list) {
 328                         if (nlportid == wdev->owner_nlportid)
 329                                 rdev_del_virtual_intf(rdev, wdev);
 330                 }
 331
 332                 spin_lock_irq(&rdev->destroy_list_lock);
 333         }
 334         spin_unlock_irq(&rdev->destroy_list_lock);
 335 }
 336
 337 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 338 {
 339         struct cfg80211_registered_device *rdev;
 340
 341         rdev = container_of(work, struct cfg80211_registered_device,
 342                             destroy_work);
 343
 344         rtnl_lock();
 345         cfg80211_destroy_ifaces(rdev);
 346         rtnl_unlock();
 347 }
 348
 349 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
 350 {
 351         struct cfg80211_registered_device *rdev;
 352
 353         rdev = container_of(work, struct cfg80211_registered_device,
 354                            sched_scan_stop_wk);
 355
 356         rtnl_lock();
 357
 358         __cfg80211_stop_sched_scan(rdev, false);
 359
 360         rtnl_unlock();
 361 }
 362
 363 /* exported functions */
 364
 365 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 366                            const char *requested_name)
 367 {
 368         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 369
 370         struct cfg80211_registered_device *rdev;
 371         int alloc_size;
 372
 373         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 374         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 375         WARN_ON(ops->connect && !ops->disconnect);
 376         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 377         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 378         WARN_ON(ops->add_station && !ops->del_station);
 379         WARN_ON(ops->add_mpath && !ops->del_mpath);
 380         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 381         WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
 382         WARN_ON(ops->start_ap && !ops->stop_ap);
 383         WARN_ON(ops->join_ocb && !ops->leave_ocb);
 384         WARN_ON(ops->suspend && !ops->resume);
 385         WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
 386         WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
 387         WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
 388         WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
 389
 390         alloc_size = sizeof(*rdev) + sizeof_priv;
 391
 392         rdev = kzalloc(alloc_size, GFP_KERNEL);
 393         if (!rdev)
 394                 return NULL;
 395
 396         rdev->ops = ops;
 397
 398         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 399
 400         if (unlikely(rdev->wiphy_idx < 0)) {
 401                 /* ugh, wrapped! */
 402                 atomic_dec(&wiphy_counter);
 403                 kfree(rdev);
 404                 return NULL;
 405         }
 406
 407         /* atomic_inc_return makes it start at 1, make it start at 0 */
 408         rdev->wiphy_idx--;
 409
 410         /* give it a proper name */
 411         if (requested_name && requested_name[0]) {
 412                 int rv;
 413
 414                 rtnl_lock();
 415                 rv = cfg80211_dev_check_name(rdev, requested_name);
 416
 417                 if (rv < 0) {
 418                         rtnl_unlock();
 419                         goto use_default_name;
 420                 }
 421
 422                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 423                 rtnl_unlock();
 424                 if (rv)
 425                         goto use_default_name;
 426         } else {
 427                 int rv;
 428
 429 use_default_name:
 430                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 431                  * the restrictions on phy names.  Probably this call could
 432                  * fail if some other part of the kernel (re)named a device
 433                  * phyX.  But, might should add some locking and check return
 434                  * value, and use a different name if this one exists?
 435                  */
 436                 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 437                 if (rv < 0) {
 438                         kfree(rdev);
 439                         return NULL;
 440                 }
 441         }
 442
 443         INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
 444         INIT_LIST_HEAD(&rdev->beacon_registrations);
 445         spin_lock_init(&rdev->beacon_registrations_lock);
 446         spin_lock_init(&rdev->bss_lock);
 447         INIT_LIST_HEAD(&rdev->bss_list);
 448         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 449         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 450         INIT_LIST_HEAD(&rdev->mlme_unreg);
 451         spin_lock_init(&rdev->mlme_unreg_lock);
 452         INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
 453         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 454                           cfg80211_dfs_channels_update_work);
 455 #ifdef CONFIG_CFG80211_WEXT
 456         rdev->wiphy.wext = &cfg80211_wext_handler;
 457 #endif
 458
 459         device_initialize(&rdev->wiphy.dev);
 460         rdev->wiphy.dev.class = &ieee80211_class;
 461         rdev->wiphy.dev.platform_data = rdev;
 462         device_enable_async_suspend(&rdev->wiphy.dev);
 463
 464         INIT_LIST_HEAD(&rdev->destroy_list);
 465         spin_lock_init(&rdev->destroy_list_lock);
 466         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 467         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 468
 469 #ifdef CONFIG_CFG80211_DEFAULT_PS
 470         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 471 #endif
 472
 473         wiphy_net_set(&rdev->wiphy, &init_net);
 474
 475         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 476         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 477                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 478                                    &rdev->rfkill_ops, rdev);
 479
 480         if (!rdev->rfkill) {
 481                 wiphy_free(&rdev->wiphy);
 482                 return NULL;
 483         }
 484
 485         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 486         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 487         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 488
 489         init_waitqueue_head(&rdev->dev_wait);
 490
 491         /*
 492          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 493          * Fragmentation and RTS threshold are disabled by default with the
 494          * special -1 value.
 495          */
 496         rdev->wiphy.retry_short = 7;
 497         rdev->wiphy.retry_long = 4;
 498         rdev->wiphy.frag_threshold = (u32) -1;
 499         rdev->wiphy.rts_threshold = (u32) -1;
 500         rdev->wiphy.coverage_class = 0;
 501
 502         rdev->wiphy.max_num_csa_counters = 1;
 503
 504         rdev->wiphy.max_sched_scan_plans = 1;
 505         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 506
 507         return &rdev->wiphy;
 508 }
 509 EXPORT_SYMBOL(wiphy_new_nm);
 510
 511 static int wiphy_verify_combinations(struct wiphy *wiphy)
 512 {
 513         const struct ieee80211_iface_combination *c;
 514         int i, j;
 515
 516         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 517                 u32 cnt = 0;
 518                 u16 all_iftypes = 0;
 519
 520                 c = &wiphy->iface_combinations[i];
 521
 522                 /*
 523                  * Combinations with just one interface aren't real,
 524                  * however we make an exception for DFS.
 525                  */
 526                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 527                         return -EINVAL;
 528
 529                 /* Need at least one channel */
 530                 if (WARN_ON(!c->num_different_channels))
 531                         return -EINVAL;
 532
 533                 /*
 534                  * Put a sane limit on maximum number of different
 535                  * channels to simplify channel accounting code.
 536                  */
 537                 if (WARN_ON(c->num_different_channels >
 538                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 539                         return -EINVAL;
 540
 541                 /* DFS only works on one channel. */
 542                 if (WARN_ON(c->radar_detect_widths &&
 543                             (c->num_different_channels > 1)))
 544                         return -EINVAL;
 545
 546                 if (WARN_ON(!c->n_limits))
 547                         return -EINVAL;
 548
 549                 for (j = 0; j < c->n_limits; j++) {
 550                         u16 types = c->limits[j].types;
 551
 552                         /* interface types shouldn't overlap */
 553                         if (WARN_ON(types & all_iftypes))
 554                                 return -EINVAL;
 555                         all_iftypes |= types;
 556
 557                         if (WARN_ON(!c->limits[j].max))
 558                                 return -EINVAL;
 559
 560                         /* Shouldn't list software iftypes in combinations! */
 561                         if (WARN_ON(wiphy->software_iftypes & types))
 562                                 return -EINVAL;
 563
 564                         /* Only a single P2P_DEVICE can be allowed */
 565                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 566                                     c->limits[j].max > 1))
 567                                 return -EINVAL;
 568
 569                         /* Only a single NAN can be allowed */
 570                         if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
 571                                     c->limits[j].max > 1))
 572                                 return -EINVAL;
 573
 574                         cnt += c->limits[j].max;
 575                         /*
 576                          * Don't advertise an unsupported type
 577                          * in a combination.
 578                          */
 579                         if (WARN_ON((wiphy->interface_modes & types) != types))
 580                                 return -EINVAL;
 581                 }
 582
 583                 /* You can't even choose that many! */
 584                 if (WARN_ON(cnt < c->max_interfaces))
 585                         return -EINVAL;
 586         }
 587
 588         return 0;
 589 }
 590
 591 int wiphy_register(struct wiphy *wiphy)
 592 {
 593         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 594         int res;
 595         enum nl80211_band band;
 596         struct ieee80211_supported_band *sband;
 597         bool have_band = false;
 598         int i;
 599         u16 ifmodes = wiphy->interface_modes;
 600
 601 #ifdef CONFIG_PM
 602         if (WARN_ON(wiphy->wowlan &&
 603                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 604                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 605                 return -EINVAL;
 606         if (WARN_ON(wiphy->wowlan &&
 607                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 608                     !wiphy->wowlan->tcp))
 609                 return -EINVAL;
 610 #endif
 611         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 612                     (!rdev->ops->tdls_channel_switch ||
 613                      !rdev->ops->tdls_cancel_channel_switch)))
 614                 return -EINVAL;
 615
 616         if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
 617                     (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
 618                      !rdev->ops->add_nan_func || !rdev->ops->del_nan_func)))
 619                 return -EINVAL;
 620
 621         /*
 622          * if a wiphy has unsupported modes for regulatory channel enforcement,
 623          * opt-out of enforcement checking
 624          */
 625         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 626                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 627                                        BIT(NL80211_IFTYPE_AP) |
 628                                        BIT(NL80211_IFTYPE_P2P_GO) |
 629                                        BIT(NL80211_IFTYPE_ADHOC) |
 630                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 631                                        BIT(NL80211_IFTYPE_NAN) |
 632                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 633                                        BIT(NL80211_IFTYPE_MONITOR)))
 634                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 635
 636         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 637                     (wiphy->regulatory_flags &
 638                                         (REGULATORY_CUSTOM_REG |
 639                                          REGULATORY_STRICT_REG |
 640                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 641                                          REGULATORY_COUNTRY_IE_IGNORE))))
 642                 return -EINVAL;
 643
 644         if (WARN_ON(wiphy->coalesce &&
 645                     (!wiphy->coalesce->n_rules ||
 646                      !wiphy->coalesce->n_patterns) &&
 647                     (!wiphy->coalesce->pattern_min_len ||
 648                      wiphy->coalesce->pattern_min_len >
 649                         wiphy->coalesce->pattern_max_len)))
 650                 return -EINVAL;
 651
 652         if (WARN_ON(wiphy->ap_sme_capa &&
 653                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 654                 return -EINVAL;
 655
 656         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 657                 return -EINVAL;
 658
 659         if (WARN_ON(wiphy->addresses &&
 660                     !is_zero_ether_addr(wiphy->perm_addr) &&
 661                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 662                            ETH_ALEN)))
 663                 return -EINVAL;
 664
 665         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 666                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 667                      !rdev->ops->set_mac_acl)))
 668                 return -EINVAL;
 669
 670         /* assure only valid behaviours are flagged by driver
 671          * hence subtract 2 as bit 0 is invalid.
 672          */
 673         if (WARN_ON(wiphy->bss_select_support &&
 674                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 675                 return -EINVAL;
 676
 677         if (wiphy->addresses)
 678                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 679
 680         /* sanity check ifmodes */
 681         WARN_ON(!ifmodes);
 682         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 683         if (WARN_ON(ifmodes != wiphy->interface_modes))
 684                 wiphy->interface_modes = ifmodes;
 685
 686         res = wiphy_verify_combinations(wiphy);
 687         if (res)
 688                 return res;
 689
 690         /* sanity check supported bands/channels */
 691         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 692                 sband = wiphy->bands[band];
 693                 if (!sband)
 694                         continue;
 695
 696                 sband->band = band;
 697                 if (WARN_ON(!sband->n_channels))
 698                         return -EINVAL;
 699                 /*
 700                  * on 60GHz band, there are no legacy rates, so
 701                  * n_bitrates is 0
 702                  */
 703                 if (WARN_ON(band != NL80211_BAND_60GHZ &&
 704                             !sband->n_bitrates))
 705                         return -EINVAL;
 706
 707                 /*
 708                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 709                  * modify the sband's ht data even if the driver uses a
 710                  * global structure for that.
 711                  */
 712                 if (cfg80211_disable_40mhz_24ghz &&
 713                     band == NL80211_BAND_2GHZ &&
 714                     sband->ht_cap.ht_supported) {
 715                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 716                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 717                 }
 718
 719                 /*
 720                  * Since we use a u32 for rate bitmaps in
 721                  * ieee80211_get_response_rate, we cannot
 722                  * have more than 32 legacy rates.
 723                  */
 724                 if (WARN_ON(sband->n_bitrates > 32))
 725                         return -EINVAL;
 726
 727                 for (i = 0; i < sband->n_channels; i++) {
 728                         sband->channels[i].orig_flags =
 729                                 sband->channels[i].flags;
 730                         sband->channels[i].orig_mag = INT_MAX;
 731                         sband->channels[i].orig_mpwr =
 732                                 sband->channels[i].max_power;
 733                         sband->channels[i].band = band;
 734                 }
 735
 736                 have_band = true;
 737         }
 738
 739         if (!have_band) {
 740                 WARN_ON(1);
 741                 return -EINVAL;
 742         }
 743
 744 #ifdef CONFIG_PM
 745         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 746                     (!rdev->wiphy.wowlan->pattern_min_len ||
 747                      rdev->wiphy.wowlan->pattern_min_len >
 748                                 rdev->wiphy.wowlan->pattern_max_len)))
 749                 return -EINVAL;
 750 #endif
 751
 752         /* check and set up bitrates */
 753         ieee80211_set_bitrate_flags(wiphy);
 754
 755         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 756
 757         rtnl_lock();
 758         res = device_add(&rdev->wiphy.dev);
 759         if (res) {
 760                 rtnl_unlock();
 761                 return res;
 762         }
 763
 764         /* set up regulatory info */
 765         wiphy_regulatory_register(wiphy);
 766
 767         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 768         cfg80211_rdev_list_generation++;
 769
 770         /* add to debugfs */
 771         rdev->wiphy.debugfsdir =
 772                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 773                                    ieee80211_debugfs_dir);
 774         if (IS_ERR(rdev->wiphy.debugfsdir))
 775                 rdev->wiphy.debugfsdir = NULL;
 776
 777         cfg80211_debugfs_rdev_add(rdev);
 778         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 779
 780         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 781                 struct regulatory_request request;
 782
 783                 request.wiphy_idx = get_wiphy_idx(wiphy);
 784                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 785                 request.alpha2[0] = '9';
 786                 request.alpha2[1] = '9';
 787
 788                 nl80211_send_reg_change_event(&request);
 789         }
 790
 791         /* Check that nobody globally advertises any capabilities they do not
 792          * advertise on all possible interface types.
 793          */
 794         if (wiphy->extended_capabilities_len &&
 795             wiphy->num_iftype_ext_capab &&
 796             wiphy->iftype_ext_capab) {
 797                 u8 supported_on_all, j;
 798                 const struct wiphy_iftype_ext_capab *capab;
 799
 800                 capab = wiphy->iftype_ext_capab;
 801                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
 802                         if (capab[0].extended_capabilities_len > j)
 803                                 supported_on_all =
 804                                         capab[0].extended_capabilities[j];
 805                         else
 806                                 supported_on_all = 0x00;
 807                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
 808                                 if (j >= capab[i].extended_capabilities_len) {
 809                                         supported_on_all = 0x00;
 810                                         break;
 811                                 }
 812                                 supported_on_all &=
 813                                         capab[i].extended_capabilities[j];
 814                         }
 815                         if (WARN_ON(wiphy->extended_capabilities[j] &
 816                                     ~supported_on_all))
 817                                 break;
 818                 }
 819         }
 820
 821         rdev->wiphy.registered = true;
 822         rtnl_unlock();
 823
 824         res = rfkill_register(rdev->rfkill);
 825         if (res) {
 826                 rfkill_destroy(rdev->rfkill);
 827                 rdev->rfkill = NULL;
 828                 wiphy_unregister(&rdev->wiphy);
 829                 return res;
 830         }
 831
 832         return 0;
 833 }
 834 EXPORT_SYMBOL(wiphy_register);
 835
 836 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 837 {
 838         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 839
 840         if (!rdev->ops->rfkill_poll)
 841                 return;
 842         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 843         rfkill_resume_polling(rdev->rfkill);
 844 }
 845 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 846
 847 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 848 {
 849         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 850
 851         rfkill_pause_polling(rdev->rfkill);
 852 }
 853 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 854
 855 void wiphy_unregister(struct wiphy *wiphy)
 856 {
 857         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 858
 859         wait_event(rdev->dev_wait, ({
 860                 int __count;
 861                 rtnl_lock();
 862                 __count = rdev->opencount;
 863                 rtnl_unlock();
 864                 __count == 0; }));
 865
 866         if (rdev->rfkill)
 867                 rfkill_unregister(rdev->rfkill);
 868
 869         rtnl_lock();
 870         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 871         rdev->wiphy.registered = false;
 872
 873         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
 874
 875         /*
 876          * First remove the hardware from everywhere, this makes
 877          * it impossible to find from userspace.
 878          */
 879         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 880         list_del_rcu(&rdev->list);
 881         synchronize_rcu();
 882
 883         /*
 884          * If this device got a regulatory hint tell core its
 885          * free to listen now to a new shiny device regulatory hint
 886          */
 887         wiphy_regulatory_deregister(wiphy);
 888
 889         cfg80211_rdev_list_generation++;
 890         device_del(&rdev->wiphy.dev);
 891
 892         rtnl_unlock();
 893
 894         flush_work(&rdev->scan_done_wk);
 895         cancel_work_sync(&rdev->conn_work);
 896         flush_work(&rdev->event_work);
 897         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 898         flush_work(&rdev->destroy_work);
 899         flush_work(&rdev->sched_scan_stop_wk);
 900         flush_work(&rdev->mlme_unreg_wk);
 901
 902 #ifdef CONFIG_PM
 903         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
 904                 rdev_set_wakeup(rdev, false);
 905 #endif
 906         cfg80211_rdev_free_wowlan(rdev);
 907         cfg80211_rdev_free_coalesce(rdev);
 908 }
 909 EXPORT_SYMBOL(wiphy_unregister);
 910
 911 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 912 {
 913         struct cfg80211_internal_bss *scan, *tmp;
 914         struct cfg80211_beacon_registration *reg, *treg;
 915         rfkill_destroy(rdev->rfkill);
 916         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 917                 list_del(&reg->list);
 918                 kfree(reg);
 919         }
 920         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 921                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 922         kfree(rdev);
 923 }
 924
 925 void wiphy_free(struct wiphy *wiphy)
 926 {
 927         put_device(&wiphy->dev);
 928 }
 929 EXPORT_SYMBOL(wiphy_free);
 930
 931 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 932 {
 933         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 934
 935         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 936                 schedule_work(&rdev->rfkill_sync);
 937 }
 938 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 939
 940 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 941 {
 942         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 943
 944         ASSERT_RTNL();
 945
 946         if (WARN_ON(wdev->netdev))
 947                 return;
 948
 949         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
 950
 951         list_del_rcu(&wdev->list);
 952         rdev->devlist_generation++;
 953
 954         switch (wdev->iftype) {
 955         case NL80211_IFTYPE_P2P_DEVICE:
 956                 cfg80211_mlme_purge_registrations(wdev);
 957                 cfg80211_stop_p2p_device(rdev, wdev);
 958                 break;
 959         case NL80211_IFTYPE_NAN:
 960                 cfg80211_stop_nan(rdev, wdev);
 961                 break;
 962         default:
 963                 WARN_ON_ONCE(1);
 964                 break;
 965         }
 966 }
 967 EXPORT_SYMBOL(cfg80211_unregister_wdev);
 968
 969 static const struct device_type wiphy_type = {
 970         .name   = "wlan",
 971 };
 972
 973 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 974                                enum nl80211_iftype iftype, int num)
 975 {
 976         ASSERT_RTNL();
 977
 978         rdev->num_running_ifaces += num;
 979         if (iftype == NL80211_IFTYPE_MONITOR)
 980                 rdev->num_running_monitor_ifaces += num;
 981 }
 982
 983 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
 984                       struct wireless_dev *wdev)
 985 {
 986         struct net_device *dev = wdev->netdev;
 987         struct cfg80211_sched_scan_request *sched_scan_req;
 988
 989         ASSERT_RTNL();
 990         ASSERT_WDEV_LOCK(wdev);
 991
 992         switch (wdev->iftype) {
 993         case NL80211_IFTYPE_ADHOC:
 994                 __cfg80211_leave_ibss(rdev, dev, true);
 995                 break;
 996         case NL80211_IFTYPE_P2P_CLIENT:
 997         case NL80211_IFTYPE_STATION:
 998                 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
 999                 if (sched_scan_req && dev == sched_scan_req->dev)
1000                         __cfg80211_stop_sched_scan(rdev, false);
1001
1002 #ifdef CONFIG_CFG80211_WEXT
1003                 kfree(wdev->wext.ie);
1004                 wdev->wext.ie = NULL;
1005                 wdev->wext.ie_len = 0;
1006                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1007 #endif
1008                 cfg80211_disconnect(rdev, dev,
1009                                     WLAN_REASON_DEAUTH_LEAVING, true);
1010                 break;
1011         case NL80211_IFTYPE_MESH_POINT:
1012                 __cfg80211_leave_mesh(rdev, dev);
1013                 break;
1014         case NL80211_IFTYPE_AP:
1015         case NL80211_IFTYPE_P2P_GO:
1016                 __cfg80211_stop_ap(rdev, dev, true);
1017                 break;
1018         case NL80211_IFTYPE_OCB:
1019                 __cfg80211_leave_ocb(rdev, dev);
1020                 break;
1021         case NL80211_IFTYPE_WDS:
1022                 /* must be handled by mac80211/driver, has no APIs */
1023                 break;
1024         case NL80211_IFTYPE_P2P_DEVICE:
1025         case NL80211_IFTYPE_NAN:
1026                 /* cannot happen, has no netdev */
1027                 break;
1028         case NL80211_IFTYPE_AP_VLAN:
1029         case NL80211_IFTYPE_MONITOR:
1030                 /* nothing to do */
1031                 break;
1032         case NL80211_IFTYPE_UNSPECIFIED:
1033         case NUM_NL80211_IFTYPES:
1034                 /* invalid */
1035                 break;
1036         }
1037 }
1038
1039 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1040                     struct wireless_dev *wdev)
1041 {
1042         wdev_lock(wdev);
1043         __cfg80211_leave(rdev, wdev);
1044         wdev_unlock(wdev);
1045 }
1046
1047 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1048                          gfp_t gfp)
1049 {
1050         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1051         struct cfg80211_event *ev;
1052         unsigned long flags;
1053
1054         trace_cfg80211_stop_iface(wiphy, wdev);
1055
1056         ev = kzalloc(sizeof(*ev), gfp);
1057         if (!ev)
1058                 return;
1059
1060         ev->type = EVENT_STOPPED;
1061
1062         spin_lock_irqsave(&wdev->event_lock, flags);
1063         list_add_tail(&ev->list, &wdev->event_list);
1064         spin_unlock_irqrestore(&wdev->event_lock, flags);
1065         queue_work(cfg80211_wq, &rdev->event_work);
1066 }
1067 EXPORT_SYMBOL(cfg80211_stop_iface);
1068
1069 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1070                                          unsigned long state, void *ptr)
1071 {
1072         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1073         struct wireless_dev *wdev = dev->ieee80211_ptr;
1074         struct cfg80211_registered_device *rdev;
1075         struct cfg80211_sched_scan_request *sched_scan_req;
1076
1077         if (!wdev)
1078                 return NOTIFY_DONE;
1079
1080         rdev = wiphy_to_rdev(wdev->wiphy);
1081
1082         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1083
1084         switch (state) {
1085         case NETDEV_POST_INIT:
1086                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1087                 break;
1088         case NETDEV_REGISTER:
1089                 /*
1090                  * NB: cannot take rdev->mtx here because this may be
1091                  * called within code protected by it when interfaces
1092                  * are added with nl80211.
1093                  */
1094                 mutex_init(&wdev->mtx);
1095                 INIT_LIST_HEAD(&wdev->event_list);
1096                 spin_lock_init(&wdev->event_lock);
1097                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1098                 spin_lock_init(&wdev->mgmt_registrations_lock);
1099
1100                 wdev->identifier = ++rdev->wdev_id;
1101                 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1102                 rdev->devlist_generation++;
1103                 /* can only change netns with wiphy */
1104                 dev->features |= NETIF_F_NETNS_LOCAL;
1105
1106                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1107                                       "phy80211")) {
1108                         pr_err("failed to add phy80211 symlink to netdev!\n");
1109                 }
1110                 wdev->netdev = dev;
1111 #ifdef CONFIG_CFG80211_WEXT
1112                 wdev->wext.default_key = -1;
1113                 wdev->wext.default_mgmt_key = -1;
1114                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1115 #endif
1116
1117                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1118                         wdev->ps = true;
1119                 else
1120                         wdev->ps = false;
1121                 /* allow mac80211 to determine the timeout */
1122                 wdev->ps_timeout = -1;
1123
1124                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1125                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1126                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1127                         dev->priv_flags |= IFF_DONT_BRIDGE;
1128
1129                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1130                 break;
1131         case NETDEV_GOING_DOWN:
1132                 cfg80211_leave(rdev, wdev);
1133                 break;
1134         case NETDEV_DOWN:
1135                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1136                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1137                         if (WARN_ON(!rdev->scan_req->notified))
1138                                 rdev->scan_req->info.aborted = true;
1139                         ___cfg80211_scan_done(rdev, false);
1140                 }
1141
1142                 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1143                 if (WARN_ON(sched_scan_req &&
1144                             sched_scan_req->dev == wdev->netdev)) {
1145                         __cfg80211_stop_sched_scan(rdev, false);
1146                 }
1147
1148                 rdev->opencount--;
1149                 wake_up(&rdev->dev_wait);
1150                 break;
1151         case NETDEV_UP:
1152                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1153                 wdev_lock(wdev);
1154                 switch (wdev->iftype) {
1155 #ifdef CONFIG_CFG80211_WEXT
1156                 case NL80211_IFTYPE_ADHOC:
1157                         cfg80211_ibss_wext_join(rdev, wdev);
1158                         break;
1159                 case NL80211_IFTYPE_STATION:
1160                         cfg80211_mgd_wext_connect(rdev, wdev);
1161                         break;
1162 #endif
1163 #ifdef CONFIG_MAC80211_MESH
1164                 case NL80211_IFTYPE_MESH_POINT:
1165                         {
1166                                 /* backward compat code... */
1167                                 struct mesh_setup setup;
1168                                 memcpy(&setup, &default_mesh_setup,
1169                                                 sizeof(setup));
1170                                  /* back compat only needed for mesh_id */
1171                                 setup.mesh_id = wdev->ssid;
1172                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1173                                 if (wdev->mesh_id_up_len)
1174                                         __cfg80211_join_mesh(rdev, dev,
1175                                                         &setup,
1176                                                         &default_mesh_config);
1177                                 break;
1178                         }
1179 #endif
1180                 default:
1181                         break;
1182                 }
1183                 wdev_unlock(wdev);
1184                 rdev->opencount++;
1185
1186                 /*
1187                  * Configure power management to the driver here so that its
1188                  * correctly set also after interface type changes etc.
1189                  */
1190                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1191                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1192                     rdev->ops->set_power_mgmt)
1193                         if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
1194                                                 wdev->ps_timeout)) {
1195                                 /* assume this means it's off */
1196                                 wdev->ps = false;
1197                         }
1198                 break;
1199         case NETDEV_UNREGISTER:
1200                 /*
1201                  * It is possible to get NETDEV_UNREGISTER
1202                  * multiple times. To detect that, check
1203                  * that the interface is still on the list
1204                  * of registered interfaces, and only then
1205                  * remove and clean it up.
1206                  */
1207                 if (!list_empty(&wdev->list)) {
1208                         nl80211_notify_iface(rdev, wdev,
1209                                              NL80211_CMD_DEL_INTERFACE);
1210                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1211                         list_del_rcu(&wdev->list);
1212                         rdev->devlist_generation++;
1213                         cfg80211_mlme_purge_registrations(wdev);
1214 #ifdef CONFIG_CFG80211_WEXT
1215                         kzfree(wdev->wext.keys);
1216 #endif
1217                 }
1218                 /*
1219                  * synchronise (so that we won't find this netdev
1220                  * from other code any more) and then clear the list
1221                  * head so that the above code can safely check for
1222                  * !list_empty() to avoid double-cleanup.
1223                  */
1224                 synchronize_rcu();
1225                 INIT_LIST_HEAD(&wdev->list);
1226                 /*
1227                  * Ensure that all events have been processed and
1228                  * freed.
1229                  */
1230                 cfg80211_process_wdev_events(wdev);
1231
1232                 if (WARN_ON(wdev->current_bss)) {
1233                         cfg80211_unhold_bss(wdev->current_bss);
1234                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1235                         wdev->current_bss = NULL;
1236                 }
1237                 break;
1238         case NETDEV_PRE_UP:
1239                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1240                         return notifier_from_errno(-EOPNOTSUPP);
1241                 if (rfkill_blocked(rdev->rfkill))
1242                         return notifier_from_errno(-ERFKILL);
1243                 break;
1244         default:
1245                 return NOTIFY_DONE;
1246         }
1247
1248         wireless_nlevent_flush();
1249
1250         return NOTIFY_OK;
1251 }
1252
1253 static struct notifier_block cfg80211_netdev_notifier = {
1254         .notifier_call = cfg80211_netdev_notifier_call,
1255 };
1256
1257 static void __net_exit cfg80211_pernet_exit(struct net *net)
1258 {
1259         struct cfg80211_registered_device *rdev;
1260
1261         rtnl_lock();
1262         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1263                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1264                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1265         }
1266         rtnl_unlock();
1267 }
1268
1269 static struct pernet_operations cfg80211_pernet_ops = {
1270         .exit = cfg80211_pernet_exit,
1271 };
1272
1273 static int __init cfg80211_init(void)
1274 {
1275         int err;
1276
1277         err = register_pernet_device(&cfg80211_pernet_ops);
1278         if (err)
1279                 goto out_fail_pernet;
1280
1281         err = wiphy_sysfs_init();
1282         if (err)
1283                 goto out_fail_sysfs;
1284
1285         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1286         if (err)
1287                 goto out_fail_notifier;
1288
1289         err = nl80211_init();
1290         if (err)
1291                 goto out_fail_nl80211;
1292
1293         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1294
1295         err = regulatory_init();
1296         if (err)
1297                 goto out_fail_reg;
1298
1299         cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1300         if (!cfg80211_wq) {
1301                 err = -ENOMEM;
1302                 goto out_fail_wq;
1303         }
1304
1305         return 0;
1306
1307 out_fail_wq:
1308         regulatory_exit();
1309 out_fail_reg:
1310         debugfs_remove(ieee80211_debugfs_dir);
1311         nl80211_exit();
1312 out_fail_nl80211:
1313         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1314 out_fail_notifier:
1315         wiphy_sysfs_exit();
1316 out_fail_sysfs:
1317         unregister_pernet_device(&cfg80211_pernet_ops);
1318 out_fail_pernet:
1319         return err;
1320 }
1321 subsys_initcall(cfg80211_init);
1322
1323 static void __exit cfg80211_exit(void)
1324 {
1325         debugfs_remove(ieee80211_debugfs_dir);
1326         nl80211_exit();
1327         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1328         wiphy_sysfs_exit();
1329         regulatory_exit();
1330         unregister_pernet_device(&cfg80211_pernet_ops);
1331         destroy_workqueue(cfg80211_wq);
1332 }
1333 module_exit(cfg80211_exit);