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                      !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
 631                 return -EINVAL;
 632
 633 #ifndef CONFIG_WIRELESS_WDS
 634         if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
 635                 return -EINVAL;
 636 #endif
 637
 638         /*
 639          * if a wiphy has unsupported modes for regulatory channel enforcement,
 640          * opt-out of enforcement checking
 641          */
 642         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 643                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 644                                        BIT(NL80211_IFTYPE_AP) |
 645                                        BIT(NL80211_IFTYPE_P2P_GO) |
 646                                        BIT(NL80211_IFTYPE_ADHOC) |
 647                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 648                                        BIT(NL80211_IFTYPE_NAN) |
 649                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 650                                        BIT(NL80211_IFTYPE_MONITOR)))
 651                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 652
 653         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 654                     (wiphy->regulatory_flags &
 655                                         (REGULATORY_CUSTOM_REG |
 656                                          REGULATORY_STRICT_REG |
 657                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 658                                          REGULATORY_COUNTRY_IE_IGNORE))))
 659                 return -EINVAL;
 660
 661         if (WARN_ON(wiphy->coalesce &&
 662                     (!wiphy->coalesce->n_rules ||
 663                      !wiphy->coalesce->n_patterns) &&
 664                     (!wiphy->coalesce->pattern_min_len ||
 665                      wiphy->coalesce->pattern_min_len >
 666                         wiphy->coalesce->pattern_max_len)))
 667                 return -EINVAL;
 668
 669         if (WARN_ON(wiphy->ap_sme_capa &&
 670                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 671                 return -EINVAL;
 672
 673         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 674                 return -EINVAL;
 675
 676         if (WARN_ON(wiphy->addresses &&
 677                     !is_zero_ether_addr(wiphy->perm_addr) &&
 678                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 679                            ETH_ALEN)))
 680                 return -EINVAL;
 681
 682         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 683                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 684                      !rdev->ops->set_mac_acl)))
 685                 return -EINVAL;
 686
 687         /* assure only valid behaviours are flagged by driver
 688          * hence subtract 2 as bit 0 is invalid.
 689          */
 690         if (WARN_ON(wiphy->bss_select_support &&
 691                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 692                 return -EINVAL;
 693
 694         if (wiphy->addresses)
 695                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 696
 697         /* sanity check ifmodes */
 698         WARN_ON(!ifmodes);
 699         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 700         if (WARN_ON(ifmodes != wiphy->interface_modes))
 701                 wiphy->interface_modes = ifmodes;
 702
 703         res = wiphy_verify_combinations(wiphy);
 704         if (res)
 705                 return res;
 706
 707         /* sanity check supported bands/channels */
 708         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 709                 sband = wiphy->bands[band];
 710                 if (!sband)
 711                         continue;
 712
 713                 sband->band = band;
 714                 if (WARN_ON(!sband->n_channels))
 715                         return -EINVAL;
 716                 /*
 717                  * on 60GHz band, there are no legacy rates, so
 718                  * n_bitrates is 0
 719                  */
 720                 if (WARN_ON(band != NL80211_BAND_60GHZ &&
 721                             !sband->n_bitrates))
 722                         return -EINVAL;
 723
 724                 /*
 725                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 726                  * modify the sband's ht data even if the driver uses a
 727                  * global structure for that.
 728                  */
 729                 if (cfg80211_disable_40mhz_24ghz &&
 730                     band == NL80211_BAND_2GHZ &&
 731                     sband->ht_cap.ht_supported) {
 732                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 733                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 734                 }
 735
 736                 /*
 737                  * Since we use a u32 for rate bitmaps in
 738                  * ieee80211_get_response_rate, we cannot
 739                  * have more than 32 legacy rates.
 740                  */
 741                 if (WARN_ON(sband->n_bitrates > 32))
 742                         return -EINVAL;
 743
 744                 for (i = 0; i < sband->n_channels; i++) {
 745                         sband->channels[i].orig_flags =
 746                                 sband->channels[i].flags;
 747                         sband->channels[i].orig_mag = INT_MAX;
 748                         sband->channels[i].orig_mpwr =
 749                                 sband->channels[i].max_power;
 750                         sband->channels[i].band = band;
 751                 }
 752
 753                 have_band = true;
 754         }
 755
 756         if (!have_band) {
 757                 WARN_ON(1);
 758                 return -EINVAL;
 759         }
 760
 761 #ifdef CONFIG_PM
 762         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 763                     (!rdev->wiphy.wowlan->pattern_min_len ||
 764                      rdev->wiphy.wowlan->pattern_min_len >
 765                                 rdev->wiphy.wowlan->pattern_max_len)))
 766                 return -EINVAL;
 767 #endif
 768
 769         /* check and set up bitrates */
 770         ieee80211_set_bitrate_flags(wiphy);
 771
 772         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 773
 774         rtnl_lock();
 775         res = device_add(&rdev->wiphy.dev);
 776         if (res) {
 777                 rtnl_unlock();
 778                 return res;
 779         }
 780
 781         /* set up regulatory info */
 782         wiphy_regulatory_register(wiphy);
 783
 784         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 785         cfg80211_rdev_list_generation++;
 786
 787         /* add to debugfs */
 788         rdev->wiphy.debugfsdir =
 789                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 790                                    ieee80211_debugfs_dir);
 791         if (IS_ERR(rdev->wiphy.debugfsdir))
 792                 rdev->wiphy.debugfsdir = NULL;
 793
 794         cfg80211_debugfs_rdev_add(rdev);
 795         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 796
 797         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 798                 struct regulatory_request request;
 799
 800                 request.wiphy_idx = get_wiphy_idx(wiphy);
 801                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 802                 request.alpha2[0] = '9';
 803                 request.alpha2[1] = '9';
 804
 805                 nl80211_send_reg_change_event(&request);
 806         }
 807
 808         /* Check that nobody globally advertises any capabilities they do not
 809          * advertise on all possible interface types.
 810          */
 811         if (wiphy->extended_capabilities_len &&
 812             wiphy->num_iftype_ext_capab &&
 813             wiphy->iftype_ext_capab) {
 814                 u8 supported_on_all, j;
 815                 const struct wiphy_iftype_ext_capab *capab;
 816
 817                 capab = wiphy->iftype_ext_capab;
 818                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
 819                         if (capab[0].extended_capabilities_len > j)
 820                                 supported_on_all =
 821                                         capab[0].extended_capabilities[j];
 822                         else
 823                                 supported_on_all = 0x00;
 824                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
 825                                 if (j >= capab[i].extended_capabilities_len) {
 826                                         supported_on_all = 0x00;
 827                                         break;
 828                                 }
 829                                 supported_on_all &=
 830                                         capab[i].extended_capabilities[j];
 831                         }
 832                         if (WARN_ON(wiphy->extended_capabilities[j] &
 833                                     ~supported_on_all))
 834                                 break;
 835                 }
 836         }
 837
 838         rdev->wiphy.registered = true;
 839         rtnl_unlock();
 840
 841         res = rfkill_register(rdev->rfkill);
 842         if (res) {
 843                 rfkill_destroy(rdev->rfkill);
 844                 rdev->rfkill = NULL;
 845                 wiphy_unregister(&rdev->wiphy);
 846                 return res;
 847         }
 848
 849         return 0;
 850 }
 851 EXPORT_SYMBOL(wiphy_register);
 852
 853 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 854 {
 855         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 856
 857         if (!rdev->ops->rfkill_poll)
 858                 return;
 859         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 860         rfkill_resume_polling(rdev->rfkill);
 861 }
 862 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 863
 864 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 865 {
 866         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 867
 868         rfkill_pause_polling(rdev->rfkill);
 869 }
 870 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 871
 872 void wiphy_unregister(struct wiphy *wiphy)
 873 {
 874         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 875
 876         wait_event(rdev->dev_wait, ({
 877                 int __count;
 878                 rtnl_lock();
 879                 __count = rdev->opencount;
 880                 rtnl_unlock();
 881                 __count == 0; }));
 882
 883         if (rdev->rfkill)
 884                 rfkill_unregister(rdev->rfkill);
 885
 886         rtnl_lock();
 887         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 888         rdev->wiphy.registered = false;
 889
 890         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
 891
 892         /*
 893          * First remove the hardware from everywhere, this makes
 894          * it impossible to find from userspace.
 895          */
 896         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 897         list_del_rcu(&rdev->list);
 898         synchronize_rcu();
 899
 900         /*
 901          * If this device got a regulatory hint tell core its
 902          * free to listen now to a new shiny device regulatory hint
 903          */
 904         wiphy_regulatory_deregister(wiphy);
 905
 906         cfg80211_rdev_list_generation++;
 907         device_del(&rdev->wiphy.dev);
 908
 909         rtnl_unlock();
 910
 911         flush_work(&rdev->scan_done_wk);
 912         cancel_work_sync(&rdev->conn_work);
 913         flush_work(&rdev->event_work);
 914         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 915         flush_work(&rdev->destroy_work);
 916         flush_work(&rdev->sched_scan_stop_wk);
 917         flush_work(&rdev->mlme_unreg_wk);
 918
 919 #ifdef CONFIG_PM
 920         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
 921                 rdev_set_wakeup(rdev, false);
 922 #endif
 923         cfg80211_rdev_free_wowlan(rdev);
 924         cfg80211_rdev_free_coalesce(rdev);
 925 }
 926 EXPORT_SYMBOL(wiphy_unregister);
 927
 928 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 929 {
 930         struct cfg80211_internal_bss *scan, *tmp;
 931         struct cfg80211_beacon_registration *reg, *treg;
 932         rfkill_destroy(rdev->rfkill);
 933         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 934                 list_del(&reg->list);
 935                 kfree(reg);
 936         }
 937         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 938                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 939         kfree(rdev);
 940 }
 941
 942 void wiphy_free(struct wiphy *wiphy)
 943 {
 944         put_device(&wiphy->dev);
 945 }
 946 EXPORT_SYMBOL(wiphy_free);
 947
 948 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 949 {
 950         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 951
 952         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 953                 schedule_work(&rdev->rfkill_sync);
 954 }
 955 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 956
 957 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 958 {
 959         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 960
 961         ASSERT_RTNL();
 962
 963         if (WARN_ON(wdev->netdev))
 964                 return;
 965
 966         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
 967
 968         list_del_rcu(&wdev->list);
 969         rdev->devlist_generation++;
 970
 971         switch (wdev->iftype) {
 972         case NL80211_IFTYPE_P2P_DEVICE:
 973                 cfg80211_mlme_purge_registrations(wdev);
 974                 cfg80211_stop_p2p_device(rdev, wdev);
 975                 break;
 976         case NL80211_IFTYPE_NAN:
 977                 cfg80211_stop_nan(rdev, wdev);
 978                 break;
 979         default:
 980                 WARN_ON_ONCE(1);
 981                 break;
 982         }
 983 }
 984 EXPORT_SYMBOL(cfg80211_unregister_wdev);
 985
 986 static const struct device_type wiphy_type = {
 987         .name   = "wlan",
 988 };
 989
 990 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 991                                enum nl80211_iftype iftype, int num)
 992 {
 993         ASSERT_RTNL();
 994
 995         rdev->num_running_ifaces += num;
 996         if (iftype == NL80211_IFTYPE_MONITOR)
 997                 rdev->num_running_monitor_ifaces += num;
 998 }
 999
1000 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1001                       struct wireless_dev *wdev)
1002 {
1003         struct net_device *dev = wdev->netdev;
1004         struct cfg80211_sched_scan_request *sched_scan_req;
1005
1006         ASSERT_RTNL();
1007         ASSERT_WDEV_LOCK(wdev);
1008
1009         switch (wdev->iftype) {
1010         case NL80211_IFTYPE_ADHOC:
1011                 __cfg80211_leave_ibss(rdev, dev, true);
1012                 break;
1013         case NL80211_IFTYPE_P2P_CLIENT:
1014         case NL80211_IFTYPE_STATION:
1015                 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1016                 if (sched_scan_req && dev == sched_scan_req->dev)
1017                         __cfg80211_stop_sched_scan(rdev, false);
1018
1019 #ifdef CONFIG_CFG80211_WEXT
1020                 kfree(wdev->wext.ie);
1021                 wdev->wext.ie = NULL;
1022                 wdev->wext.ie_len = 0;
1023                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1024 #endif
1025                 cfg80211_disconnect(rdev, dev,
1026                                     WLAN_REASON_DEAUTH_LEAVING, true);
1027                 break;
1028         case NL80211_IFTYPE_MESH_POINT:
1029                 __cfg80211_leave_mesh(rdev, dev);
1030                 break;
1031         case NL80211_IFTYPE_AP:
1032         case NL80211_IFTYPE_P2P_GO:
1033                 __cfg80211_stop_ap(rdev, dev, true);
1034                 break;
1035         case NL80211_IFTYPE_OCB:
1036                 __cfg80211_leave_ocb(rdev, dev);
1037                 break;
1038         case NL80211_IFTYPE_WDS:
1039                 /* must be handled by mac80211/driver, has no APIs */
1040                 break;
1041         case NL80211_IFTYPE_P2P_DEVICE:
1042         case NL80211_IFTYPE_NAN:
1043                 /* cannot happen, has no netdev */
1044                 break;
1045         case NL80211_IFTYPE_AP_VLAN:
1046         case NL80211_IFTYPE_MONITOR:
1047                 /* nothing to do */
1048                 break;
1049         case NL80211_IFTYPE_UNSPECIFIED:
1050         case NUM_NL80211_IFTYPES:
1051                 /* invalid */
1052                 break;
1053         }
1054 }
1055
1056 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1057                     struct wireless_dev *wdev)
1058 {
1059         wdev_lock(wdev);
1060         __cfg80211_leave(rdev, wdev);
1061         wdev_unlock(wdev);
1062 }
1063
1064 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1065                          gfp_t gfp)
1066 {
1067         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1068         struct cfg80211_event *ev;
1069         unsigned long flags;
1070
1071         trace_cfg80211_stop_iface(wiphy, wdev);
1072
1073         ev = kzalloc(sizeof(*ev), gfp);
1074         if (!ev)
1075                 return;
1076
1077         ev->type = EVENT_STOPPED;
1078
1079         spin_lock_irqsave(&wdev->event_lock, flags);
1080         list_add_tail(&ev->list, &wdev->event_list);
1081         spin_unlock_irqrestore(&wdev->event_lock, flags);
1082         queue_work(cfg80211_wq, &rdev->event_work);
1083 }
1084 EXPORT_SYMBOL(cfg80211_stop_iface);
1085
1086 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1087                                          unsigned long state, void *ptr)
1088 {
1089         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1090         struct wireless_dev *wdev = dev->ieee80211_ptr;
1091         struct cfg80211_registered_device *rdev;
1092         struct cfg80211_sched_scan_request *sched_scan_req;
1093
1094         if (!wdev)
1095                 return NOTIFY_DONE;
1096
1097         rdev = wiphy_to_rdev(wdev->wiphy);
1098
1099         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1100
1101         switch (state) {
1102         case NETDEV_POST_INIT:
1103                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1104                 break;
1105         case NETDEV_REGISTER:
1106                 /*
1107                  * NB: cannot take rdev->mtx here because this may be
1108                  * called within code protected by it when interfaces
1109                  * are added with nl80211.
1110                  */
1111                 mutex_init(&wdev->mtx);
1112                 INIT_LIST_HEAD(&wdev->event_list);
1113                 spin_lock_init(&wdev->event_lock);
1114                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1115                 spin_lock_init(&wdev->mgmt_registrations_lock);
1116
1117                 wdev->identifier = ++rdev->wdev_id;
1118                 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1119                 rdev->devlist_generation++;
1120                 /* can only change netns with wiphy */
1121                 dev->features |= NETIF_F_NETNS_LOCAL;
1122
1123                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1124                                       "phy80211")) {
1125                         pr_err("failed to add phy80211 symlink to netdev!\n");
1126                 }
1127                 wdev->netdev = dev;
1128 #ifdef CONFIG_CFG80211_WEXT
1129                 wdev->wext.default_key = -1;
1130                 wdev->wext.default_mgmt_key = -1;
1131                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1132 #endif
1133
1134                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1135                         wdev->ps = true;
1136                 else
1137                         wdev->ps = false;
1138                 /* allow mac80211 to determine the timeout */
1139                 wdev->ps_timeout = -1;
1140
1141                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1142                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1143                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1144                         dev->priv_flags |= IFF_DONT_BRIDGE;
1145
1146                 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1147
1148                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1149                 break;
1150         case NETDEV_GOING_DOWN:
1151                 cfg80211_leave(rdev, wdev);
1152                 break;
1153         case NETDEV_DOWN:
1154                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1155                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1156                         if (WARN_ON(!rdev->scan_req->notified))
1157                                 rdev->scan_req->info.aborted = true;
1158                         ___cfg80211_scan_done(rdev, false);
1159                 }
1160
1161                 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1162                 if (WARN_ON(sched_scan_req &&
1163                             sched_scan_req->dev == wdev->netdev)) {
1164                         __cfg80211_stop_sched_scan(rdev, false);
1165                 }
1166
1167                 rdev->opencount--;
1168                 wake_up(&rdev->dev_wait);
1169                 break;
1170         case NETDEV_UP:
1171                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1172                 wdev_lock(wdev);
1173                 switch (wdev->iftype) {
1174 #ifdef CONFIG_CFG80211_WEXT
1175                 case NL80211_IFTYPE_ADHOC:
1176                         cfg80211_ibss_wext_join(rdev, wdev);
1177                         break;
1178                 case NL80211_IFTYPE_STATION:
1179                         cfg80211_mgd_wext_connect(rdev, wdev);
1180                         break;
1181 #endif
1182 #ifdef CONFIG_MAC80211_MESH
1183                 case NL80211_IFTYPE_MESH_POINT:
1184                         {
1185                                 /* backward compat code... */
1186                                 struct mesh_setup setup;
1187                                 memcpy(&setup, &default_mesh_setup,
1188                                                 sizeof(setup));
1189                                  /* back compat only needed for mesh_id */
1190                                 setup.mesh_id = wdev->ssid;
1191                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1192                                 if (wdev->mesh_id_up_len)
1193                                         __cfg80211_join_mesh(rdev, dev,
1194                                                         &setup,
1195                                                         &default_mesh_config);
1196                                 break;
1197                         }
1198 #endif
1199                 default:
1200                         break;
1201                 }
1202                 wdev_unlock(wdev);
1203                 rdev->opencount++;
1204
1205                 /*
1206                  * Configure power management to the driver here so that its
1207                  * correctly set also after interface type changes etc.
1208                  */
1209                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1210                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1211                     rdev->ops->set_power_mgmt)
1212                         if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
1213                                                 wdev->ps_timeout)) {
1214                                 /* assume this means it's off */
1215                                 wdev->ps = false;
1216                         }
1217                 break;
1218         case NETDEV_UNREGISTER:
1219                 /*
1220                  * It is possible to get NETDEV_UNREGISTER
1221                  * multiple times. To detect that, check
1222                  * that the interface is still on the list
1223                  * of registered interfaces, and only then
1224                  * remove and clean it up.
1225                  */
1226                 if (!list_empty(&wdev->list)) {
1227                         nl80211_notify_iface(rdev, wdev,
1228                                              NL80211_CMD_DEL_INTERFACE);
1229                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1230                         list_del_rcu(&wdev->list);
1231                         rdev->devlist_generation++;
1232                         cfg80211_mlme_purge_registrations(wdev);
1233 #ifdef CONFIG_CFG80211_WEXT
1234                         kzfree(wdev->wext.keys);
1235 #endif
1236                         flush_work(&wdev->disconnect_wk);
1237                 }
1238                 /*
1239                  * synchronise (so that we won't find this netdev
1240                  * from other code any more) and then clear the list
1241                  * head so that the above code can safely check for
1242                  * !list_empty() to avoid double-cleanup.
1243                  */
1244                 synchronize_rcu();
1245                 INIT_LIST_HEAD(&wdev->list);
1246                 /*
1247                  * Ensure that all events have been processed and
1248                  * freed.
1249                  */
1250                 cfg80211_process_wdev_events(wdev);
1251
1252                 if (WARN_ON(wdev->current_bss)) {
1253                         cfg80211_unhold_bss(wdev->current_bss);
1254                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1255                         wdev->current_bss = NULL;
1256                 }
1257                 break;
1258         case NETDEV_PRE_UP:
1259                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1260                         return notifier_from_errno(-EOPNOTSUPP);
1261                 if (rfkill_blocked(rdev->rfkill))
1262                         return notifier_from_errno(-ERFKILL);
1263                 break;
1264         default:
1265                 return NOTIFY_DONE;
1266         }
1267
1268         wireless_nlevent_flush();
1269
1270         return NOTIFY_OK;
1271 }
1272
1273 static struct notifier_block cfg80211_netdev_notifier = {
1274         .notifier_call = cfg80211_netdev_notifier_call,
1275 };
1276
1277 static void __net_exit cfg80211_pernet_exit(struct net *net)
1278 {
1279         struct cfg80211_registered_device *rdev;
1280
1281         rtnl_lock();
1282         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1283                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1284                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1285         }
1286         rtnl_unlock();
1287 }
1288
1289 static struct pernet_operations cfg80211_pernet_ops = {
1290         .exit = cfg80211_pernet_exit,
1291 };
1292
1293 static int __init cfg80211_init(void)
1294 {
1295         int err;
1296
1297         err = register_pernet_device(&cfg80211_pernet_ops);
1298         if (err)
1299                 goto out_fail_pernet;
1300
1301         err = wiphy_sysfs_init();
1302         if (err)
1303                 goto out_fail_sysfs;
1304
1305         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1306         if (err)
1307                 goto out_fail_notifier;
1308
1309         err = nl80211_init();
1310         if (err)
1311                 goto out_fail_nl80211;
1312
1313         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1314
1315         err = regulatory_init();
1316         if (err)
1317                 goto out_fail_reg;
1318
1319         cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1320         if (!cfg80211_wq) {
1321                 err = -ENOMEM;
1322                 goto out_fail_wq;
1323         }
1324
1325         return 0;
1326
1327 out_fail_wq:
1328         regulatory_exit();
1329 out_fail_reg:
1330         debugfs_remove(ieee80211_debugfs_dir);
1331         nl80211_exit();
1332 out_fail_nl80211:
1333         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1334 out_fail_notifier:
1335         wiphy_sysfs_exit();
1336 out_fail_sysfs:
1337         unregister_pernet_device(&cfg80211_pernet_ops);
1338 out_fail_pernet:
1339         return err;
1340 }
1341 subsys_initcall(cfg80211_init);
1342
1343 static void __exit cfg80211_exit(void)
1344 {
1345         debugfs_remove(ieee80211_debugfs_dir);
1346         nl80211_exit();
1347         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1348         wiphy_sysfs_exit();
1349         regulatory_exit();
1350         unregister_pernet_device(&cfg80211_pernet_ops);
1351         destroy_workqueue(cfg80211_wq);
1352 }
1353 module_exit(cfg80211_exit);