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_running(wdev))
 214                 return;
 215
 216         rdev_stop_p2p_device(rdev, wdev);
 217         wdev->is_running = 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->info.aborted = true;
 224                 ___cfg80211_scan_done(rdev, false);
 225         }
 226 }
 227
 228 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
 229                        struct wireless_dev *wdev)
 230 {
 231         ASSERT_RTNL();
 232
 233         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
 234                 return;
 235
 236         if (!wdev_running(wdev))
 237                 return;
 238
 239         rdev_stop_nan(rdev, wdev);
 240         wdev->is_running = false;
 241
 242         rdev->opencount--;
 243 }
 244
 245 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 246 {
 247         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 248         struct wireless_dev *wdev;
 249
 250         ASSERT_RTNL();
 251
 252         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 253                 if (wdev->netdev) {
 254                         dev_close(wdev->netdev);
 255                         continue;
 256                 }
 257                 /* otherwise, check iftype */
 258                 switch (wdev->iftype) {
 259                 case NL80211_IFTYPE_P2P_DEVICE:
 260                         cfg80211_stop_p2p_device(rdev, wdev);
 261                         break;
 262                 case NL80211_IFTYPE_NAN:
 263                         cfg80211_stop_nan(rdev, wdev);
 264                         break;
 265                 default:
 266                         break;
 267                 }
 268         }
 269 }
 270 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 271
 272 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 273 {
 274         struct cfg80211_registered_device *rdev = data;
 275
 276         if (!blocked)
 277                 return 0;
 278
 279         rtnl_lock();
 280         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 281         rtnl_unlock();
 282
 283         return 0;
 284 }
 285
 286 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 287 {
 288         struct cfg80211_registered_device *rdev;
 289
 290         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 291         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 292 }
 293
 294 static void cfg80211_event_work(struct work_struct *work)
 295 {
 296         struct cfg80211_registered_device *rdev;
 297
 298         rdev = container_of(work, struct cfg80211_registered_device,
 299                             event_work);
 300
 301         rtnl_lock();
 302         cfg80211_process_rdev_events(rdev);
 303         rtnl_unlock();
 304 }
 305
 306 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 307 {
 308         struct cfg80211_iface_destroy *item;
 309
 310         ASSERT_RTNL();
 311
 312         spin_lock_irq(&rdev->destroy_list_lock);
 313         while ((item = list_first_entry_or_null(&rdev->destroy_list,
 314                                                 struct cfg80211_iface_destroy,
 315                                                 list))) {
 316                 struct wireless_dev *wdev, *tmp;
 317                 u32 nlportid = item->nlportid;
 318
 319                 list_del(&item->list);
 320                 kfree(item);
 321                 spin_unlock_irq(&rdev->destroy_list_lock);
 322
 323                 list_for_each_entry_safe(wdev, tmp,
 324                                          &rdev->wiphy.wdev_list, list) {
 325                         if (nlportid == wdev->owner_nlportid)
 326                                 rdev_del_virtual_intf(rdev, wdev);
 327                 }
 328
 329                 spin_lock_irq(&rdev->destroy_list_lock);
 330         }
 331         spin_unlock_irq(&rdev->destroy_list_lock);
 332 }
 333
 334 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 335 {
 336         struct cfg80211_registered_device *rdev;
 337
 338         rdev = container_of(work, struct cfg80211_registered_device,
 339                             destroy_work);
 340
 341         rtnl_lock();
 342         cfg80211_destroy_ifaces(rdev);
 343         rtnl_unlock();
 344 }
 345
 346 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
 347 {
 348         struct cfg80211_registered_device *rdev;
 349
 350         rdev = container_of(work, struct cfg80211_registered_device,
 351                            sched_scan_stop_wk);
 352
 353         rtnl_lock();
 354
 355         __cfg80211_stop_sched_scan(rdev, false);
 356
 357         rtnl_unlock();
 358 }
 359
 360 /* exported functions */
 361
 362 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 363                            const char *requested_name)
 364 {
 365         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 366
 367         struct cfg80211_registered_device *rdev;
 368         int alloc_size;
 369
 370         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 371         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 372         WARN_ON(ops->connect && !ops->disconnect);
 373         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 374         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 375         WARN_ON(ops->add_station && !ops->del_station);
 376         WARN_ON(ops->add_mpath && !ops->del_mpath);
 377         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 378         WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
 379         WARN_ON(ops->start_ap && !ops->stop_ap);
 380         WARN_ON(ops->join_ocb && !ops->leave_ocb);
 381         WARN_ON(ops->suspend && !ops->resume);
 382         WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
 383         WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
 384         WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
 385         WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
 386
 387         alloc_size = sizeof(*rdev) + sizeof_priv;
 388
 389         rdev = kzalloc(alloc_size, GFP_KERNEL);
 390         if (!rdev)
 391                 return NULL;
 392
 393         rdev->ops = ops;
 394
 395         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 396
 397         if (unlikely(rdev->wiphy_idx < 0)) {
 398                 /* ugh, wrapped! */
 399                 atomic_dec(&wiphy_counter);
 400                 kfree(rdev);
 401                 return NULL;
 402         }
 403
 404         /* atomic_inc_return makes it start at 1, make it start at 0 */
 405         rdev->wiphy_idx--;
 406
 407         /* give it a proper name */
 408         if (requested_name && requested_name[0]) {
 409                 int rv;
 410
 411                 rtnl_lock();
 412                 rv = cfg80211_dev_check_name(rdev, requested_name);
 413
 414                 if (rv < 0) {
 415                         rtnl_unlock();
 416                         goto use_default_name;
 417                 }
 418
 419                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 420                 rtnl_unlock();
 421                 if (rv)
 422                         goto use_default_name;
 423         } else {
 424 use_default_name:
 425                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 426                  * the restrictions on phy names.  Probably this call could
 427                  * fail if some other part of the kernel (re)named a device
 428                  * phyX.  But, might should add some locking and check return
 429                  * value, and use a different name if this one exists?
 430                  */
 431                 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 432         }
 433
 434         INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
 435         INIT_LIST_HEAD(&rdev->beacon_registrations);
 436         spin_lock_init(&rdev->beacon_registrations_lock);
 437         spin_lock_init(&rdev->bss_lock);
 438         INIT_LIST_HEAD(&rdev->bss_list);
 439         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 440         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 441         INIT_LIST_HEAD(&rdev->mlme_unreg);
 442         spin_lock_init(&rdev->mlme_unreg_lock);
 443         INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
 444         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 445                           cfg80211_dfs_channels_update_work);
 446 #ifdef CONFIG_CFG80211_WEXT
 447         rdev->wiphy.wext = &cfg80211_wext_handler;
 448 #endif
 449
 450         device_initialize(&rdev->wiphy.dev);
 451         rdev->wiphy.dev.class = &ieee80211_class;
 452         rdev->wiphy.dev.platform_data = rdev;
 453         device_enable_async_suspend(&rdev->wiphy.dev);
 454
 455         INIT_LIST_HEAD(&rdev->destroy_list);
 456         spin_lock_init(&rdev->destroy_list_lock);
 457         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 458         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 459
 460 #ifdef CONFIG_CFG80211_DEFAULT_PS
 461         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 462 #endif
 463
 464         wiphy_net_set(&rdev->wiphy, &init_net);
 465
 466         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 467         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 468                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 469                                    &rdev->rfkill_ops, rdev);
 470
 471         if (!rdev->rfkill) {
 472                 kfree(rdev);
 473                 return NULL;
 474         }
 475
 476         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 477         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 478         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 479
 480         init_waitqueue_head(&rdev->dev_wait);
 481
 482         /*
 483          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 484          * Fragmentation and RTS threshold are disabled by default with the
 485          * special -1 value.
 486          */
 487         rdev->wiphy.retry_short = 7;
 488         rdev->wiphy.retry_long = 4;
 489         rdev->wiphy.frag_threshold = (u32) -1;
 490         rdev->wiphy.rts_threshold = (u32) -1;
 491         rdev->wiphy.coverage_class = 0;
 492
 493         rdev->wiphy.max_num_csa_counters = 1;
 494
 495         rdev->wiphy.max_sched_scan_plans = 1;
 496         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 497
 498         return &rdev->wiphy;
 499 }
 500 EXPORT_SYMBOL(wiphy_new_nm);
 501
 502 static int wiphy_verify_combinations(struct wiphy *wiphy)
 503 {
 504         const struct ieee80211_iface_combination *c;
 505         int i, j;
 506
 507         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 508                 u32 cnt = 0;
 509                 u16 all_iftypes = 0;
 510
 511                 c = &wiphy->iface_combinations[i];
 512
 513                 /*
 514                  * Combinations with just one interface aren't real,
 515                  * however we make an exception for DFS.
 516                  */
 517                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 518                         return -EINVAL;
 519
 520                 /* Need at least one channel */
 521                 if (WARN_ON(!c->num_different_channels))
 522                         return -EINVAL;
 523
 524                 /*
 525                  * Put a sane limit on maximum number of different
 526                  * channels to simplify channel accounting code.
 527                  */
 528                 if (WARN_ON(c->num_different_channels >
 529                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 530                         return -EINVAL;
 531
 532                 /* DFS only works on one channel. */
 533                 if (WARN_ON(c->radar_detect_widths &&
 534                             (c->num_different_channels > 1)))
 535                         return -EINVAL;
 536
 537                 if (WARN_ON(!c->n_limits))
 538                         return -EINVAL;
 539
 540                 for (j = 0; j < c->n_limits; j++) {
 541                         u16 types = c->limits[j].types;
 542
 543                         /* interface types shouldn't overlap */
 544                         if (WARN_ON(types & all_iftypes))
 545                                 return -EINVAL;
 546                         all_iftypes |= types;
 547
 548                         if (WARN_ON(!c->limits[j].max))
 549                                 return -EINVAL;
 550
 551                         /* Shouldn't list software iftypes in combinations! */
 552                         if (WARN_ON(wiphy->software_iftypes & types))
 553                                 return -EINVAL;
 554
 555                         /* Only a single P2P_DEVICE can be allowed */
 556                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 557                                     c->limits[j].max > 1))
 558                                 return -EINVAL;
 559
 560                         /* Only a single NAN can be allowed */
 561                         if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
 562                                     c->limits[j].max > 1))
 563                                 return -EINVAL;
 564
 565                         /*
 566                          * This isn't well-defined right now. If you have an
 567                          * IBSS interface, then its beacon interval may change
 568                          * by joining other networks, and nothing prevents it
 569                          * from doing that.
 570                          * So technically we probably shouldn't even allow AP
 571                          * and IBSS in the same interface, but it seems that
 572                          * some drivers support that, possibly only with fixed
 573                          * beacon intervals for IBSS.
 574                          */
 575                         if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
 576                                     c->beacon_int_min_gcd)) {
 577                                 return -EINVAL;
 578                         }
 579
 580                         cnt += c->limits[j].max;
 581                         /*
 582                          * Don't advertise an unsupported type
 583                          * in a combination.
 584                          */
 585                         if (WARN_ON((wiphy->interface_modes & types) != types))
 586                                 return -EINVAL;
 587                 }
 588
 589 #ifndef CONFIG_WIRELESS_WDS
 590                 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
 591                         return -EINVAL;
 592 #endif
 593
 594                 /* You can't even choose that many! */
 595                 if (WARN_ON(cnt < c->max_interfaces))
 596                         return -EINVAL;
 597         }
 598
 599         return 0;
 600 }
 601
 602 int wiphy_register(struct wiphy *wiphy)
 603 {
 604         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 605         int res;
 606         enum nl80211_band band;
 607         struct ieee80211_supported_band *sband;
 608         bool have_band = false;
 609         int i;
 610         u16 ifmodes = wiphy->interface_modes;
 611
 612 #ifdef CONFIG_PM
 613         if (WARN_ON(wiphy->wowlan &&
 614                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 615                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 616                 return -EINVAL;
 617         if (WARN_ON(wiphy->wowlan &&
 618                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 619                     !wiphy->wowlan->tcp))
 620                 return -EINVAL;
 621 #endif
 622         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 623                     (!rdev->ops->tdls_channel_switch ||
 624                      !rdev->ops->tdls_cancel_channel_switch)))
 625                 return -EINVAL;
 626
 627         if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
 628                     (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
 629                      !rdev->ops->add_nan_func || !rdev->ops->del_nan_func)))
 630                 return -EINVAL;
 631
 632 #ifndef CONFIG_WIRELESS_WDS
 633         if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
 634                 return -EINVAL;
 635 #endif
 636
 637         /*
 638          * if a wiphy has unsupported modes for regulatory channel enforcement,
 639          * opt-out of enforcement checking
 640          */
 641         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 642                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 643                                        BIT(NL80211_IFTYPE_AP) |
 644                                        BIT(NL80211_IFTYPE_P2P_GO) |
 645                                        BIT(NL80211_IFTYPE_ADHOC) |
 646                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 647                                        BIT(NL80211_IFTYPE_NAN) |
 648                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 649                                        BIT(NL80211_IFTYPE_MONITOR)))
 650                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 651
 652         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 653                     (wiphy->regulatory_flags &
 654                                         (REGULATORY_CUSTOM_REG |
 655                                          REGULATORY_STRICT_REG |
 656                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 657                                          REGULATORY_COUNTRY_IE_IGNORE))))
 658                 return -EINVAL;
 659
 660         if (WARN_ON(wiphy->coalesce &&
 661                     (!wiphy->coalesce->n_rules ||
 662                      !wiphy->coalesce->n_patterns) &&
 663                     (!wiphy->coalesce->pattern_min_len ||
 664                      wiphy->coalesce->pattern_min_len >
 665                         wiphy->coalesce->pattern_max_len)))
 666                 return -EINVAL;
 667
 668         if (WARN_ON(wiphy->ap_sme_capa &&
 669                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 670                 return -EINVAL;
 671
 672         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 673                 return -EINVAL;
 674
 675         if (WARN_ON(wiphy->addresses &&
 676                     !is_zero_ether_addr(wiphy->perm_addr) &&
 677                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 678                            ETH_ALEN)))
 679                 return -EINVAL;
 680
 681         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 682                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 683                      !rdev->ops->set_mac_acl)))
 684                 return -EINVAL;
 685
 686         /* assure only valid behaviours are flagged by driver
 687          * hence subtract 2 as bit 0 is invalid.
 688          */
 689         if (WARN_ON(wiphy->bss_select_support &&
 690                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 691                 return -EINVAL;
 692
 693         if (wiphy->addresses)
 694                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 695
 696         /* sanity check ifmodes */
 697         WARN_ON(!ifmodes);
 698         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 699         if (WARN_ON(ifmodes != wiphy->interface_modes))
 700                 wiphy->interface_modes = ifmodes;
 701
 702         res = wiphy_verify_combinations(wiphy);
 703         if (res)
 704                 return res;
 705
 706         /* sanity check supported bands/channels */
 707         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 708                 sband = wiphy->bands[band];
 709                 if (!sband)
 710                         continue;
 711
 712                 sband->band = band;
 713                 if (WARN_ON(!sband->n_channels))
 714                         return -EINVAL;
 715                 /*
 716                  * on 60GHz band, there are no legacy rates, so
 717                  * n_bitrates is 0
 718                  */
 719                 if (WARN_ON(band != NL80211_BAND_60GHZ &&
 720                             !sband->n_bitrates))
 721                         return -EINVAL;
 722
 723                 /*
 724                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 725                  * modify the sband's ht data even if the driver uses a
 726                  * global structure for that.
 727                  */
 728                 if (cfg80211_disable_40mhz_24ghz &&
 729                     band == NL80211_BAND_2GHZ &&
 730                     sband->ht_cap.ht_supported) {
 731                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 732                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 733                 }
 734
 735                 /*
 736                  * Since we use a u32 for rate bitmaps in
 737                  * ieee80211_get_response_rate, we cannot
 738                  * have more than 32 legacy rates.
 739                  */
 740                 if (WARN_ON(sband->n_bitrates > 32))
 741                         return -EINVAL;
 742
 743                 for (i = 0; i < sband->n_channels; i++) {
 744                         sband->channels[i].orig_flags =
 745                                 sband->channels[i].flags;
 746                         sband->channels[i].orig_mag = INT_MAX;
 747                         sband->channels[i].orig_mpwr =
 748                                 sband->channels[i].max_power;
 749                         sband->channels[i].band = band;
 750                 }
 751
 752                 have_band = true;
 753         }
 754
 755         if (!have_band) {
 756                 WARN_ON(1);
 757                 return -EINVAL;
 758         }
 759
 760 #ifdef CONFIG_PM
 761         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 762                     (!rdev->wiphy.wowlan->pattern_min_len ||
 763                      rdev->wiphy.wowlan->pattern_min_len >
 764                                 rdev->wiphy.wowlan->pattern_max_len)))
 765                 return -EINVAL;
 766 #endif
 767
 768         /* check and set up bitrates */
 769         ieee80211_set_bitrate_flags(wiphy);
 770
 771         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 772
 773         rtnl_lock();
 774         res = device_add(&rdev->wiphy.dev);
 775         if (res) {
 776                 rtnl_unlock();
 777                 return res;
 778         }
 779
 780         /* set up regulatory info */
 781         wiphy_regulatory_register(wiphy);
 782
 783         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 784         cfg80211_rdev_list_generation++;
 785
 786         /* add to debugfs */
 787         rdev->wiphy.debugfsdir =
 788                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 789                                    ieee80211_debugfs_dir);
 790         if (IS_ERR(rdev->wiphy.debugfsdir))
 791                 rdev->wiphy.debugfsdir = NULL;
 792
 793         cfg80211_debugfs_rdev_add(rdev);
 794         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 795
 796         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 797                 struct regulatory_request request;
 798
 799                 request.wiphy_idx = get_wiphy_idx(wiphy);
 800                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 801                 request.alpha2[0] = '9';
 802                 request.alpha2[1] = '9';
 803
 804                 nl80211_send_reg_change_event(&request);
 805         }
 806
 807         /* Check that nobody globally advertises any capabilities they do not
 808          * advertise on all possible interface types.
 809          */
 810         if (wiphy->extended_capabilities_len &&
 811             wiphy->num_iftype_ext_capab &&
 812             wiphy->iftype_ext_capab) {
 813                 u8 supported_on_all, j;
 814                 const struct wiphy_iftype_ext_capab *capab;
 815
 816                 capab = wiphy->iftype_ext_capab;
 817                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
 818                         if (capab[0].extended_capabilities_len > j)
 819                                 supported_on_all =
 820                                         capab[0].extended_capabilities[j];
 821                         else
 822                                 supported_on_all = 0x00;
 823                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
 824                                 if (j >= capab[i].extended_capabilities_len) {
 825                                         supported_on_all = 0x00;
 826                                         break;
 827                                 }
 828                                 supported_on_all &=
 829                                         capab[i].extended_capabilities[j];
 830                         }
 831                         if (WARN_ON(wiphy->extended_capabilities[j] &
 832                                     ~supported_on_all))
 833                                 break;
 834                 }
 835         }
 836
 837         rdev->wiphy.registered = true;
 838         rtnl_unlock();
 839
 840         res = rfkill_register(rdev->rfkill);
 841         if (res) {
 842                 rfkill_destroy(rdev->rfkill);
 843                 rdev->rfkill = NULL;
 844                 wiphy_unregister(&rdev->wiphy);
 845                 return res;
 846         }
 847
 848         return 0;
 849 }
 850 EXPORT_SYMBOL(wiphy_register);
 851
 852 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 853 {
 854         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 855
 856         if (!rdev->ops->rfkill_poll)
 857                 return;
 858         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 859         rfkill_resume_polling(rdev->rfkill);
 860 }
 861 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 862
 863 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 864 {
 865         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 866
 867         rfkill_pause_polling(rdev->rfkill);
 868 }
 869 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 870
 871 void wiphy_unregister(struct wiphy *wiphy)
 872 {
 873         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 874
 875         wait_event(rdev->dev_wait, ({
 876                 int __count;
 877                 rtnl_lock();
 878                 __count = rdev->opencount;
 879                 rtnl_unlock();
 880                 __count == 0; }));
 881
 882         if (rdev->rfkill)
 883                 rfkill_unregister(rdev->rfkill);
 884
 885         rtnl_lock();
 886         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 887         rdev->wiphy.registered = false;
 888
 889         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
 890
 891         /*
 892          * First remove the hardware from everywhere, this makes
 893          * it impossible to find from userspace.
 894          */
 895         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 896         list_del_rcu(&rdev->list);
 897         synchronize_rcu();
 898
 899         /*
 900          * If this device got a regulatory hint tell core its
 901          * free to listen now to a new shiny device regulatory hint
 902          */
 903         wiphy_regulatory_deregister(wiphy);
 904
 905         cfg80211_rdev_list_generation++;
 906         device_del(&rdev->wiphy.dev);
 907
 908         rtnl_unlock();
 909
 910         flush_work(&rdev->scan_done_wk);
 911         cancel_work_sync(&rdev->conn_work);
 912         flush_work(&rdev->event_work);
 913         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 914         flush_work(&rdev->destroy_work);
 915         flush_work(&rdev->sched_scan_stop_wk);
 916         flush_work(&rdev->mlme_unreg_wk);
 917
 918 #ifdef CONFIG_PM
 919         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
 920                 rdev_set_wakeup(rdev, false);
 921 #endif
 922         cfg80211_rdev_free_wowlan(rdev);
 923         cfg80211_rdev_free_coalesce(rdev);
 924 }
 925 EXPORT_SYMBOL(wiphy_unregister);
 926
 927 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 928 {
 929         struct cfg80211_internal_bss *scan, *tmp;
 930         struct cfg80211_beacon_registration *reg, *treg;
 931         rfkill_destroy(rdev->rfkill);
 932         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 933                 list_del(&reg->list);
 934                 kfree(reg);
 935         }
 936         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 937                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 938         kfree(rdev);
 939 }
 940
 941 void wiphy_free(struct wiphy *wiphy)
 942 {
 943         put_device(&wiphy->dev);
 944 }
 945 EXPORT_SYMBOL(wiphy_free);
 946
 947 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 948 {
 949         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 950
 951         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 952                 schedule_work(&rdev->rfkill_sync);
 953 }
 954 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 955
 956 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 957 {
 958         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 959
 960         ASSERT_RTNL();
 961
 962         if (WARN_ON(wdev->netdev))
 963                 return;
 964
 965         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
 966
 967         list_del_rcu(&wdev->list);
 968         rdev->devlist_generation++;
 969
 970         switch (wdev->iftype) {
 971         case NL80211_IFTYPE_P2P_DEVICE:
 972                 cfg80211_mlme_purge_registrations(wdev);
 973                 cfg80211_stop_p2p_device(rdev, wdev);
 974                 break;
 975         case NL80211_IFTYPE_NAN:
 976                 cfg80211_stop_nan(rdev, wdev);
 977                 break;
 978         default:
 979                 WARN_ON_ONCE(1);
 980                 break;
 981         }
 982 }
 983 EXPORT_SYMBOL(cfg80211_unregister_wdev);
 984
 985 static const struct device_type wiphy_type = {
 986         .name   = "wlan",
 987 };
 988
 989 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 990                                enum nl80211_iftype iftype, int num)
 991 {
 992         ASSERT_RTNL();
 993
 994         rdev->num_running_ifaces += num;
 995         if (iftype == NL80211_IFTYPE_MONITOR)
 996                 rdev->num_running_monitor_ifaces += num;
 997 }
 998
 999 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1000                       struct wireless_dev *wdev)
1001 {
1002         struct net_device *dev = wdev->netdev;
1003         struct cfg80211_sched_scan_request *sched_scan_req;
1004
1005         ASSERT_RTNL();
1006         ASSERT_WDEV_LOCK(wdev);
1007
1008         switch (wdev->iftype) {
1009         case NL80211_IFTYPE_ADHOC:
1010                 __cfg80211_leave_ibss(rdev, dev, true);
1011                 break;
1012         case NL80211_IFTYPE_P2P_CLIENT:
1013         case NL80211_IFTYPE_STATION:
1014                 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1015                 if (sched_scan_req && dev == sched_scan_req->dev)
1016                         __cfg80211_stop_sched_scan(rdev, false);
1017
1018 #ifdef CONFIG_CFG80211_WEXT
1019                 kfree(wdev->wext.ie);
1020                 wdev->wext.ie = NULL;
1021                 wdev->wext.ie_len = 0;
1022                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1023 #endif
1024                 cfg80211_disconnect(rdev, dev,
1025                                     WLAN_REASON_DEAUTH_LEAVING, true);
1026                 break;
1027         case NL80211_IFTYPE_MESH_POINT:
1028                 __cfg80211_leave_mesh(rdev, dev);
1029                 break;
1030         case NL80211_IFTYPE_AP:
1031         case NL80211_IFTYPE_P2P_GO:
1032                 __cfg80211_stop_ap(rdev, dev, true);
1033                 break;
1034         case NL80211_IFTYPE_OCB:
1035                 __cfg80211_leave_ocb(rdev, dev);
1036                 break;
1037         case NL80211_IFTYPE_WDS:
1038                 /* must be handled by mac80211/driver, has no APIs */
1039                 break;
1040         case NL80211_IFTYPE_P2P_DEVICE:
1041         case NL80211_IFTYPE_NAN:
1042                 /* cannot happen, has no netdev */
1043                 break;
1044         case NL80211_IFTYPE_AP_VLAN:
1045         case NL80211_IFTYPE_MONITOR:
1046                 /* nothing to do */
1047                 break;
1048         case NL80211_IFTYPE_UNSPECIFIED:
1049         case NUM_NL80211_IFTYPES:
1050                 /* invalid */
1051                 break;
1052         }
1053 }
1054
1055 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1056                     struct wireless_dev *wdev)
1057 {
1058         wdev_lock(wdev);
1059         __cfg80211_leave(rdev, wdev);
1060         wdev_unlock(wdev);
1061 }
1062
1063 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1064                          gfp_t gfp)
1065 {
1066         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1067         struct cfg80211_event *ev;
1068         unsigned long flags;
1069
1070         trace_cfg80211_stop_iface(wiphy, wdev);
1071
1072         ev = kzalloc(sizeof(*ev), gfp);
1073         if (!ev)
1074                 return;
1075
1076         ev->type = EVENT_STOPPED;
1077
1078         spin_lock_irqsave(&wdev->event_lock, flags);
1079         list_add_tail(&ev->list, &wdev->event_list);
1080         spin_unlock_irqrestore(&wdev->event_lock, flags);
1081         queue_work(cfg80211_wq, &rdev->event_work);
1082 }
1083 EXPORT_SYMBOL(cfg80211_stop_iface);
1084
1085 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1086                                          unsigned long state, void *ptr)
1087 {
1088         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1089         struct wireless_dev *wdev = dev->ieee80211_ptr;
1090         struct cfg80211_registered_device *rdev;
1091         struct cfg80211_sched_scan_request *sched_scan_req;
1092
1093         if (!wdev)
1094                 return NOTIFY_DONE;
1095
1096         rdev = wiphy_to_rdev(wdev->wiphy);
1097
1098         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1099
1100         switch (state) {
1101         case NETDEV_POST_INIT:
1102                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1103                 break;
1104         case NETDEV_REGISTER:
1105                 /*
1106                  * NB: cannot take rdev->mtx here because this may be
1107                  * called within code protected by it when interfaces
1108                  * are added with nl80211.
1109                  */
1110                 mutex_init(&wdev->mtx);
1111                 INIT_LIST_HEAD(&wdev->event_list);
1112                 spin_lock_init(&wdev->event_lock);
1113                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1114                 spin_lock_init(&wdev->mgmt_registrations_lock);
1115
1116                 wdev->identifier = ++rdev->wdev_id;
1117                 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1118                 rdev->devlist_generation++;
1119                 /* can only change netns with wiphy */
1120                 dev->features |= NETIF_F_NETNS_LOCAL;
1121
1122                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1123                                       "phy80211")) {
1124                         pr_err("failed to add phy80211 symlink to netdev!\n");
1125                 }
1126                 wdev->netdev = dev;
1127 #ifdef CONFIG_CFG80211_WEXT
1128                 wdev->wext.default_key = -1;
1129                 wdev->wext.default_mgmt_key = -1;
1130                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1131 #endif
1132
1133                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1134                         wdev->ps = true;
1135                 else
1136                         wdev->ps = false;
1137                 /* allow mac80211 to determine the timeout */
1138                 wdev->ps_timeout = -1;
1139
1140                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1141                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1142                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1143                         dev->priv_flags |= IFF_DONT_BRIDGE;
1144
1145                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1146                 break;
1147         case NETDEV_GOING_DOWN:
1148                 cfg80211_leave(rdev, wdev);
1149                 break;
1150         case NETDEV_DOWN:
1151                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1152                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1153                         if (WARN_ON(!rdev->scan_req->notified))
1154                                 rdev->scan_req->info.aborted = true;
1155                         ___cfg80211_scan_done(rdev, false);
1156                 }
1157
1158                 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1159                 if (WARN_ON(sched_scan_req &&
1160                             sched_scan_req->dev == wdev->netdev)) {
1161                         __cfg80211_stop_sched_scan(rdev, false);
1162                 }
1163
1164                 rdev->opencount--;
1165                 wake_up(&rdev->dev_wait);
1166                 break;
1167         case NETDEV_UP:
1168                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1169                 wdev_lock(wdev);
1170                 switch (wdev->iftype) {
1171 #ifdef CONFIG_CFG80211_WEXT
1172                 case NL80211_IFTYPE_ADHOC:
1173                         cfg80211_ibss_wext_join(rdev, wdev);
1174                         break;
1175                 case NL80211_IFTYPE_STATION:
1176                         cfg80211_mgd_wext_connect(rdev, wdev);
1177                         break;
1178 #endif
1179 #ifdef CONFIG_MAC80211_MESH
1180                 case NL80211_IFTYPE_MESH_POINT:
1181                         {
1182                                 /* backward compat code... */
1183                                 struct mesh_setup setup;
1184                                 memcpy(&setup, &default_mesh_setup,
1185                                                 sizeof(setup));
1186                                  /* back compat only needed for mesh_id */
1187                                 setup.mesh_id = wdev->ssid;
1188                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1189                                 if (wdev->mesh_id_up_len)
1190                                         __cfg80211_join_mesh(rdev, dev,
1191                                                         &setup,
1192                                                         &default_mesh_config);
1193                                 break;
1194                         }
1195 #endif
1196                 default:
1197                         break;
1198                 }
1199                 wdev_unlock(wdev);
1200                 rdev->opencount++;
1201
1202                 /*
1203                  * Configure power management to the driver here so that its
1204                  * correctly set also after interface type changes etc.
1205                  */
1206                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1207                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1208                     rdev->ops->set_power_mgmt)
1209                         if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
1210                                                 wdev->ps_timeout)) {
1211                                 /* assume this means it's off */
1212                                 wdev->ps = false;
1213                         }
1214                 break;
1215         case NETDEV_UNREGISTER:
1216                 /*
1217                  * It is possible to get NETDEV_UNREGISTER
1218                  * multiple times. To detect that, check
1219                  * that the interface is still on the list
1220                  * of registered interfaces, and only then
1221                  * remove and clean it up.
1222                  */
1223                 if (!list_empty(&wdev->list)) {
1224                         nl80211_notify_iface(rdev, wdev,
1225                                              NL80211_CMD_DEL_INTERFACE);
1226                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1227                         list_del_rcu(&wdev->list);
1228                         rdev->devlist_generation++;
1229                         cfg80211_mlme_purge_registrations(wdev);
1230 #ifdef CONFIG_CFG80211_WEXT
1231                         kzfree(wdev->wext.keys);
1232 #endif
1233                 }
1234                 /*
1235                  * synchronise (so that we won't find this netdev
1236                  * from other code any more) and then clear the list
1237                  * head so that the above code can safely check for
1238                  * !list_empty() to avoid double-cleanup.
1239                  */
1240                 synchronize_rcu();
1241                 INIT_LIST_HEAD(&wdev->list);
1242                 /*
1243                  * Ensure that all events have been processed and
1244                  * freed.
1245                  */
1246                 cfg80211_process_wdev_events(wdev);
1247
1248                 if (WARN_ON(wdev->current_bss)) {
1249                         cfg80211_unhold_bss(wdev->current_bss);
1250                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1251                         wdev->current_bss = NULL;
1252                 }
1253                 break;
1254         case NETDEV_PRE_UP:
1255                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1256                         return notifier_from_errno(-EOPNOTSUPP);
1257                 if (rfkill_blocked(rdev->rfkill))
1258                         return notifier_from_errno(-ERFKILL);
1259                 break;
1260         default:
1261                 return NOTIFY_DONE;
1262         }
1263
1264         wireless_nlevent_flush();
1265
1266         return NOTIFY_OK;
1267 }
1268
1269 static struct notifier_block cfg80211_netdev_notifier = {
1270         .notifier_call = cfg80211_netdev_notifier_call,
1271 };
1272
1273 static void __net_exit cfg80211_pernet_exit(struct net *net)
1274 {
1275         struct cfg80211_registered_device *rdev;
1276
1277         rtnl_lock();
1278         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1279                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1280                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1281         }
1282         rtnl_unlock();
1283 }
1284
1285 static struct pernet_operations cfg80211_pernet_ops = {
1286         .exit = cfg80211_pernet_exit,
1287 };
1288
1289 static int __init cfg80211_init(void)
1290 {
1291         int err;
1292
1293         err = register_pernet_device(&cfg80211_pernet_ops);
1294         if (err)
1295                 goto out_fail_pernet;
1296
1297         err = wiphy_sysfs_init();
1298         if (err)
1299                 goto out_fail_sysfs;
1300
1301         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1302         if (err)
1303                 goto out_fail_notifier;
1304
1305         err = nl80211_init();
1306         if (err)
1307                 goto out_fail_nl80211;
1308
1309         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1310
1311         err = regulatory_init();
1312         if (err)
1313                 goto out_fail_reg;
1314
1315         cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1316         if (!cfg80211_wq) {
1317                 err = -ENOMEM;
1318                 goto out_fail_wq;
1319         }
1320
1321         return 0;
1322
1323 out_fail_wq:
1324         regulatory_exit();
1325 out_fail_reg:
1326         debugfs_remove(ieee80211_debugfs_dir);
1327         nl80211_exit();
1328 out_fail_nl80211:
1329         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1330 out_fail_notifier:
1331         wiphy_sysfs_exit();
1332 out_fail_sysfs:
1333         unregister_pernet_device(&cfg80211_pernet_ops);
1334 out_fail_pernet:
1335         return err;
1336 }
1337 subsys_initcall(cfg80211_init);
1338
1339 static void __exit cfg80211_exit(void)
1340 {
1341         debugfs_remove(ieee80211_debugfs_dir);
1342         nl80211_exit();
1343         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1344         wiphy_sysfs_exit();
1345         regulatory_exit();
1346         unregister_pernet_device(&cfg80211_pernet_ops);
1347         destroy_workqueue(cfg80211_wq);
1348 }
1349 module_exit(cfg80211_exit);