net/wireless/core.c

   1 /*
   2  * This is the linux wireless configuration interface.
   3  *
   4  * Copyright 2006-2009          Johannes Berg <[email protected]>
   5  */
   6
   7 #include <linux/if.h>
   8 #include <linux/module.h>
   9 #include <linux/err.h>
  10 #include <linux/list.h>
  11 #include <linux/nl80211.h>
  12 #include <linux/debugfs.h>
  13 #include <linux/notifier.h>
  14 #include <linux/device.h>
  15 #include <linux/rtnetlink.h>
  16 #include <net/genetlink.h>
  17 #include <net/cfg80211.h>
  18 #include "nl80211.h"
  19 #include "core.h"
  20 #include "sysfs.h"
  21 #include "debugfs.h"
  22
  23 /* name for sysfs, %d is appended */
  24 #define PHY_NAME "phy"
  25
  26 MODULE_AUTHOR("Johannes Berg");
  27 MODULE_LICENSE("GPL");
  28 MODULE_DESCRIPTION("wireless configuration support");
  29
  30 /* RCU might be appropriate here since we usually
  31  * only read the list, and that can happen quite
  32  * often because we need to do it for each command */
  33 LIST_HEAD(cfg80211_rdev_list);
  34
  35 /*
  36  * This is used to protect the cfg80211_rdev_list, cfg80211_regdomain,
  37  * country_ie_regdomain, the reg_beacon_list and the the last regulatory
  38  * request receipt (last_request).
  39  */
  40 DEFINE_MUTEX(cfg80211_mutex);
  41
  42 /* for debugfs */
  43 static struct dentry *ieee80211_debugfs_dir;
  44
  45 /* requires cfg80211_mutex to be held! */
  46 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  47 {
  48         struct cfg80211_registered_device *result = NULL, *rdev;
  49
  50         if (!wiphy_idx_valid(wiphy_idx))
  51                 return NULL;
  52
  53         assert_cfg80211_lock();
  54
  55         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  56                 if (rdev->wiphy_idx == wiphy_idx) {
  57                         result = rdev;
  58                         break;
  59                 }
  60         }
  61
  62         return result;
  63 }
  64
  65 int get_wiphy_idx(struct wiphy *wiphy)
  66 {
  67         struct cfg80211_registered_device *rdev;
  68         if (!wiphy)
  69                 return WIPHY_IDX_STALE;
  70         rdev = wiphy_to_dev(wiphy);
  71         return rdev->wiphy_idx;
  72 }
  73
  74 /* requires cfg80211_rdev_mutex to be held! */
  75 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  76 {
  77         struct cfg80211_registered_device *rdev;
  78
  79         if (!wiphy_idx_valid(wiphy_idx))
  80                 return NULL;
  81
  82         assert_cfg80211_lock();
  83
  84         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  85         if (!rdev)
  86                 return NULL;
  87         return &rdev->wiphy;
  88 }
  89
  90 /* requires cfg80211_mutex to be held! */
  91 struct cfg80211_registered_device *
  92 __cfg80211_rdev_from_info(struct genl_info *info)
  93 {
  94         int ifindex;
  95         struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
  96         struct net_device *dev;
  97         int err = -EINVAL;
  98
  99         assert_cfg80211_lock();
 100
 101         if (info->attrs[NL80211_ATTR_WIPHY]) {
 102                 bywiphyidx = cfg80211_rdev_by_wiphy_idx(
 103                                 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
 104                 err = -ENODEV;
 105         }
 106
 107         if (info->attrs[NL80211_ATTR_IFINDEX]) {
 108                 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
 109                 dev = dev_get_by_index(&init_net, ifindex);
 110                 if (dev) {
 111                         if (dev->ieee80211_ptr)
 112                                 byifidx =
 113                                         wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 114                         dev_put(dev);
 115                 }
 116                 err = -ENODEV;
 117         }
 118
 119         if (bywiphyidx && byifidx) {
 120                 if (bywiphyidx != byifidx)
 121                         return ERR_PTR(-EINVAL);
 122                 else
 123                         return bywiphyidx; /* == byifidx */
 124         }
 125         if (bywiphyidx)
 126                 return bywiphyidx;
 127
 128         if (byifidx)
 129                 return byifidx;
 130
 131         return ERR_PTR(err);
 132 }
 133
 134 struct cfg80211_registered_device *
 135 cfg80211_get_dev_from_info(struct genl_info *info)
 136 {
 137         struct cfg80211_registered_device *rdev;
 138
 139         mutex_lock(&cfg80211_mutex);
 140         rdev = __cfg80211_rdev_from_info(info);
 141
 142         /* if it is not an error we grab the lock on
 143          * it to assure it won't be going away while
 144          * we operate on it */
 145         if (!IS_ERR(rdev))
 146                 mutex_lock(&rdev->mtx);
 147
 148         mutex_unlock(&cfg80211_mutex);
 149
 150         return rdev;
 151 }
 152
 153 struct cfg80211_registered_device *
 154 cfg80211_get_dev_from_ifindex(int ifindex)
 155 {
 156         struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
 157         struct net_device *dev;
 158
 159         mutex_lock(&cfg80211_mutex);
 160         dev = dev_get_by_index(&init_net, ifindex);
 161         if (!dev)
 162                 goto out;
 163         if (dev->ieee80211_ptr) {
 164                 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 165                 mutex_lock(&rdev->mtx);
 166         } else
 167                 rdev = ERR_PTR(-ENODEV);
 168         dev_put(dev);
 169  out:
 170         mutex_unlock(&cfg80211_mutex);
 171         return rdev;
 172 }
 173
 174 /* requires cfg80211_mutex to be held */
 175 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 176                         char *newname)
 177 {
 178         struct cfg80211_registered_device *rdev2;
 179         int wiphy_idx, taken = -1, result, digits;
 180
 181         assert_cfg80211_lock();
 182
 183         /* prohibit calling the thing phy%d when %d is not its number */
 184         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 185         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 186                 /* count number of places needed to print wiphy_idx */
 187                 digits = 1;
 188                 while (wiphy_idx /= 10)
 189                         digits++;
 190                 /*
 191                  * deny the name if it is phy<idx> where <idx> is printed
 192                  * without leading zeroes. taken == strlen(newname) here
 193                  */
 194                 if (taken == strlen(PHY_NAME) + digits)
 195                         return -EINVAL;
 196         }
 197
 198
 199         /* Ignore nop renames */
 200         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
 201                 return 0;
 202
 203         /* Ensure another device does not already have this name. */
 204         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 205                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
 206                         return -EINVAL;
 207
 208         result = device_rename(&rdev->wiphy.dev, newname);
 209         if (result)
 210                 return result;
 211
 212         if (rdev->wiphy.debugfsdir &&
 213             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 214                             rdev->wiphy.debugfsdir,
 215                             rdev->wiphy.debugfsdir->d_parent,
 216                             newname))
 217                 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
 218                        newname);
 219
 220         nl80211_notify_dev_rename(rdev);
 221
 222         return 0;
 223 }
 224
 225 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 226 {
 227         struct cfg80211_registered_device *rdev = data;
 228
 229         rdev->ops->rfkill_poll(&rdev->wiphy);
 230 }
 231
 232 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 233 {
 234         struct cfg80211_registered_device *rdev = data;
 235         struct wireless_dev *wdev;
 236
 237         if (!blocked)
 238                 return 0;
 239
 240         rtnl_lock();
 241         mutex_lock(&rdev->devlist_mtx);
 242
 243         list_for_each_entry(wdev, &rdev->netdev_list, list)
 244                 dev_close(wdev->netdev);
 245
 246         mutex_unlock(&rdev->devlist_mtx);
 247         rtnl_unlock();
 248
 249         return 0;
 250 }
 251
 252 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 253 {
 254         struct cfg80211_registered_device *rdev;
 255
 256         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 257         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 258 }
 259
 260 static void cfg80211_process_events(struct wireless_dev *wdev)
 261 {
 262         struct cfg80211_event *ev;
 263         unsigned long flags;
 264
 265         spin_lock_irqsave(&wdev->event_lock, flags);
 266         while (!list_empty(&wdev->event_list)) {
 267                 ev = list_first_entry(&wdev->event_list,
 268                                       struct cfg80211_event, list);
 269                 list_del(&ev->list);
 270                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 271
 272                 wdev_lock(wdev);
 273                 switch (ev->type) {
 274                 case EVENT_CONNECT_RESULT:
 275                         __cfg80211_connect_result(
 276                                 wdev->netdev, ev->cr.bssid,
 277                                 ev->cr.req_ie, ev->cr.req_ie_len,
 278                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
 279                                 ev->cr.status,
 280                                 ev->cr.status == WLAN_STATUS_SUCCESS);
 281                         break;
 282                 case EVENT_ROAMED:
 283                         __cfg80211_roamed(wdev, ev->rm.bssid,
 284                                           ev->rm.req_ie, ev->rm.req_ie_len,
 285                                           ev->rm.resp_ie, ev->rm.resp_ie_len);
 286                         break;
 287                 case EVENT_DISCONNECTED:
 288                         __cfg80211_disconnected(wdev->netdev,
 289                                                 ev->dc.ie, ev->dc.ie_len,
 290                                                 ev->dc.reason, true);
 291                         break;
 292                 case EVENT_IBSS_JOINED:
 293                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
 294                         break;
 295                 }
 296                 wdev_unlock(wdev);
 297
 298                 kfree(ev);
 299
 300                 spin_lock_irqsave(&wdev->event_lock, flags);
 301         }
 302         spin_unlock_irqrestore(&wdev->event_lock, flags);
 303 }
 304
 305 static void cfg80211_event_work(struct work_struct *work)
 306 {
 307         struct cfg80211_registered_device *rdev;
 308         struct wireless_dev *wdev;
 309
 310         rdev = container_of(work, struct cfg80211_registered_device,
 311                             event_work);
 312
 313         rtnl_lock();
 314         cfg80211_lock_rdev(rdev);
 315         mutex_lock(&rdev->devlist_mtx);
 316
 317         list_for_each_entry(wdev, &rdev->netdev_list, list)
 318                 cfg80211_process_events(wdev);
 319
 320         mutex_unlock(&rdev->devlist_mtx);
 321         cfg80211_unlock_rdev(rdev);
 322         rtnl_unlock();
 323 }
 324
 325 /* exported functions */
 326
 327 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 328 {
 329         static int wiphy_counter;
 330
 331         struct cfg80211_registered_device *rdev;
 332         int alloc_size;
 333
 334         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 335         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 336         WARN_ON(ops->connect && !ops->disconnect);
 337         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 338         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 339         WARN_ON(ops->add_station && !ops->del_station);
 340         WARN_ON(ops->add_mpath && !ops->del_mpath);
 341
 342         alloc_size = sizeof(*rdev) + sizeof_priv;
 343
 344         rdev = kzalloc(alloc_size, GFP_KERNEL);
 345         if (!rdev)
 346                 return NULL;
 347
 348         rdev->ops = ops;
 349
 350         mutex_lock(&cfg80211_mutex);
 351
 352         rdev->wiphy_idx = wiphy_counter++;
 353
 354         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
 355                 wiphy_counter--;
 356                 mutex_unlock(&cfg80211_mutex);
 357                 /* ugh, wrapped! */
 358                 kfree(rdev);
 359                 return NULL;
 360         }
 361
 362         mutex_unlock(&cfg80211_mutex);
 363
 364         /* give it a proper name */
 365         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 366
 367         mutex_init(&rdev->mtx);
 368         mutex_init(&rdev->devlist_mtx);
 369         INIT_LIST_HEAD(&rdev->netdev_list);
 370         spin_lock_init(&rdev->bss_lock);
 371         INIT_LIST_HEAD(&rdev->bss_list);
 372         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 373
 374         device_initialize(&rdev->wiphy.dev);
 375         rdev->wiphy.dev.class = &ieee80211_class;
 376         rdev->wiphy.dev.platform_data = rdev;
 377
 378         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 379         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 380                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 381                                    &rdev->rfkill_ops, rdev);
 382
 383         if (!rdev->rfkill) {
 384                 kfree(rdev);
 385                 return NULL;
 386         }
 387
 388         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 389         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 390         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 391
 392         /*
 393          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 394          * Fragmentation and RTS threshold are disabled by default with the
 395          * special -1 value.
 396          */
 397         rdev->wiphy.retry_short = 7;
 398         rdev->wiphy.retry_long = 4;
 399         rdev->wiphy.frag_threshold = (u32) -1;
 400         rdev->wiphy.rts_threshold = (u32) -1;
 401
 402         return &rdev->wiphy;
 403 }
 404 EXPORT_SYMBOL(wiphy_new);
 405
 406 int wiphy_register(struct wiphy *wiphy)
 407 {
 408         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 409         int res;
 410         enum ieee80211_band band;
 411         struct ieee80211_supported_band *sband;
 412         bool have_band = false;
 413         int i;
 414         u16 ifmodes = wiphy->interface_modes;
 415
 416         /* sanity check ifmodes */
 417         WARN_ON(!ifmodes);
 418         ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
 419         if (WARN_ON(ifmodes != wiphy->interface_modes))
 420                 wiphy->interface_modes = ifmodes;
 421
 422         /* sanity check supported bands/channels */
 423         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 424                 sband = wiphy->bands[band];
 425                 if (!sband)
 426                         continue;
 427
 428                 sband->band = band;
 429
 430                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
 431                         return -EINVAL;
 432
 433                 /*
 434                  * Since we use a u32 for rate bitmaps in
 435                  * ieee80211_get_response_rate, we cannot
 436                  * have more than 32 legacy rates.
 437                  */
 438                 if (WARN_ON(sband->n_bitrates > 32))
 439                         return -EINVAL;
 440
 441                 for (i = 0; i < sband->n_channels; i++) {
 442                         sband->channels[i].orig_flags =
 443                                 sband->channels[i].flags;
 444                         sband->channels[i].orig_mag =
 445                                 sband->channels[i].max_antenna_gain;
 446                         sband->channels[i].orig_mpwr =
 447                                 sband->channels[i].max_power;
 448                         sband->channels[i].band = band;
 449                 }
 450
 451                 have_band = true;
 452         }
 453
 454         if (!have_band) {
 455                 WARN_ON(1);
 456                 return -EINVAL;
 457         }
 458
 459         /* check and set up bitrates */
 460         ieee80211_set_bitrate_flags(wiphy);
 461
 462         res = device_add(&rdev->wiphy.dev);
 463         if (res)
 464                 return res;
 465
 466         res = rfkill_register(rdev->rfkill);
 467         if (res)
 468                 goto out_rm_dev;
 469
 470         mutex_lock(&cfg80211_mutex);
 471
 472         /* set up regulatory info */
 473         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
 474
 475         list_add(&rdev->list, &cfg80211_rdev_list);
 476
 477         mutex_unlock(&cfg80211_mutex);
 478
 479         /* add to debugfs */
 480         rdev->wiphy.debugfsdir =
 481                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 482                                    ieee80211_debugfs_dir);
 483         if (IS_ERR(rdev->wiphy.debugfsdir))
 484                 rdev->wiphy.debugfsdir = NULL;
 485
 486         if (wiphy->custom_regulatory) {
 487                 struct regulatory_request request;
 488
 489                 request.wiphy_idx = get_wiphy_idx(wiphy);
 490                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 491                 request.alpha2[0] = '9';
 492                 request.alpha2[1] = '9';
 493
 494                 nl80211_send_reg_change_event(&request);
 495         }
 496
 497         cfg80211_debugfs_rdev_add(rdev);
 498
 499         return 0;
 500
 501  out_rm_dev:
 502         device_del(&rdev->wiphy.dev);
 503         return res;
 504 }
 505 EXPORT_SYMBOL(wiphy_register);
 506
 507 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 508 {
 509         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 510
 511         if (!rdev->ops->rfkill_poll)
 512                 return;
 513         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 514         rfkill_resume_polling(rdev->rfkill);
 515 }
 516 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 517
 518 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 519 {
 520         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 521
 522         rfkill_pause_polling(rdev->rfkill);
 523 }
 524 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 525
 526 void wiphy_unregister(struct wiphy *wiphy)
 527 {
 528         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 529
 530         rfkill_unregister(rdev->rfkill);
 531
 532         /* protect the device list */
 533         mutex_lock(&cfg80211_mutex);
 534
 535         BUG_ON(!list_empty(&rdev->netdev_list));
 536
 537         /*
 538          * Try to grab rdev->mtx. If a command is still in progress,
 539          * hopefully the driver will refuse it since it's tearing
 540          * down the device already. We wait for this command to complete
 541          * before unlinking the item from the list.
 542          * Note: as codified by the BUG_ON above we cannot get here if
 543          * a virtual interface is still associated. Hence, we can only
 544          * get to lock contention here if userspace issues a command
 545          * that identified the hardware by wiphy index.
 546          */
 547         mutex_lock(&rdev->mtx);
 548         /* unlock again before freeing */
 549         mutex_unlock(&rdev->mtx);
 550
 551         cfg80211_debugfs_rdev_del(rdev);
 552
 553         /* If this device got a regulatory hint tell core its
 554          * free to listen now to a new shiny device regulatory hint */
 555         reg_device_remove(wiphy);
 556
 557         list_del(&rdev->list);
 558         device_del(&rdev->wiphy.dev);
 559         debugfs_remove(rdev->wiphy.debugfsdir);
 560
 561         mutex_unlock(&cfg80211_mutex);
 562
 563         cancel_work_sync(&rdev->conn_work);
 564         cancel_work_sync(&rdev->scan_done_wk);
 565         kfree(rdev->scan_req);
 566         flush_work(&rdev->event_work);
 567 }
 568 EXPORT_SYMBOL(wiphy_unregister);
 569
 570 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 571 {
 572         struct cfg80211_internal_bss *scan, *tmp;
 573         rfkill_destroy(rdev->rfkill);
 574         mutex_destroy(&rdev->mtx);
 575         mutex_destroy(&rdev->devlist_mtx);
 576         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 577                 cfg80211_put_bss(&scan->pub);
 578         kfree(rdev);
 579 }
 580
 581 void wiphy_free(struct wiphy *wiphy)
 582 {
 583         put_device(&wiphy->dev);
 584 }
 585 EXPORT_SYMBOL(wiphy_free);
 586
 587 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 588 {
 589         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 590
 591         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 592                 schedule_work(&rdev->rfkill_sync);
 593 }
 594 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 595
 596 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
 597                                          unsigned long state,
 598                                          void *ndev)
 599 {
 600         struct net_device *dev = ndev;
 601         struct wireless_dev *wdev = dev->ieee80211_ptr;
 602         struct cfg80211_registered_device *rdev;
 603
 604         if (!wdev)
 605                 return NOTIFY_DONE;
 606
 607         rdev = wiphy_to_dev(wdev->wiphy);
 608
 609         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 610
 611         switch (state) {
 612         case NETDEV_REGISTER:
 613                 mutex_init(&wdev->mtx);
 614                 INIT_LIST_HEAD(&wdev->event_list);
 615                 spin_lock_init(&wdev->event_lock);
 616                 mutex_lock(&rdev->devlist_mtx);
 617                 list_add(&wdev->list, &rdev->netdev_list);
 618                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 619                                       "phy80211")) {
 620                         printk(KERN_ERR "wireless: failed to add phy80211 "
 621                                 "symlink to netdev!\n");
 622                 }
 623                 wdev->netdev = dev;
 624                 wdev->sme_state = CFG80211_SME_IDLE;
 625                 mutex_unlock(&rdev->devlist_mtx);
 626 #ifdef CONFIG_WIRELESS_EXT
 627                 wdev->wext.default_key = -1;
 628                 wdev->wext.default_mgmt_key = -1;
 629                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 630                 wdev->wext.ps = CONFIG_CFG80211_DEFAULT_PS_VALUE;
 631                 wdev->wext.ps_timeout = 500;
 632                 if (rdev->ops->set_power_mgmt)
 633                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
 634                                                       wdev->wext.ps,
 635                                                       wdev->wext.ps_timeout)) {
 636                                 /* assume this means it's off */
 637                                 wdev->wext.ps = false;
 638                         }
 639 #endif
 640                 break;
 641         case NETDEV_GOING_DOWN:
 642                 switch (wdev->iftype) {
 643                 case NL80211_IFTYPE_ADHOC:
 644                         cfg80211_leave_ibss(rdev, dev, true);
 645                         break;
 646                 case NL80211_IFTYPE_STATION:
 647                         wdev_lock(wdev);
 648 #ifdef CONFIG_WIRELESS_EXT
 649                         kfree(wdev->wext.ie);
 650                         wdev->wext.ie = NULL;
 651                         wdev->wext.ie_len = 0;
 652                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 653 #endif
 654                         __cfg80211_disconnect(rdev, dev,
 655                                               WLAN_REASON_DEAUTH_LEAVING, true);
 656                         cfg80211_mlme_down(rdev, dev);
 657                         wdev_unlock(wdev);
 658                         break;
 659                 default:
 660                         break;
 661                 }
 662                 break;
 663         case NETDEV_UP:
 664 #ifdef CONFIG_WIRELESS_EXT
 665                 cfg80211_lock_rdev(rdev);
 666                 wdev_lock(wdev);
 667                 switch (wdev->iftype) {
 668                 case NL80211_IFTYPE_ADHOC:
 669                         cfg80211_ibss_wext_join(rdev, wdev);
 670                         break;
 671                 case NL80211_IFTYPE_STATION:
 672                         cfg80211_mgd_wext_connect(rdev, wdev);
 673                         break;
 674                 default:
 675                         break;
 676                 }
 677                 wdev_unlock(wdev);
 678                 cfg80211_unlock_rdev(rdev);
 679 #endif
 680                 break;
 681         case NETDEV_UNREGISTER:
 682                 mutex_lock(&rdev->devlist_mtx);
 683                 if (!list_empty(&wdev->list)) {
 684                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 685                         list_del_init(&wdev->list);
 686                 }
 687                 mutex_unlock(&rdev->devlist_mtx);
 688                 mutex_destroy(&wdev->mtx);
 689 #ifdef CONFIG_WIRELESS_EXT
 690                 kfree(wdev->wext.keys);
 691 #endif
 692                 break;
 693         case NETDEV_PRE_UP:
 694                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 695                         return notifier_from_errno(-EOPNOTSUPP);
 696                 if (rfkill_blocked(rdev->rfkill))
 697                         return notifier_from_errno(-ERFKILL);
 698                 break;
 699         }
 700
 701         return NOTIFY_DONE;
 702 }
 703
 704 static struct notifier_block cfg80211_netdev_notifier = {
 705         .notifier_call = cfg80211_netdev_notifier_call,
 706 };
 707
 708 static int cfg80211_init(void)
 709 {
 710         int err;
 711
 712         err = wiphy_sysfs_init();
 713         if (err)
 714                 goto out_fail_sysfs;
 715
 716         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
 717         if (err)
 718                 goto out_fail_notifier;
 719
 720         err = nl80211_init();
 721         if (err)
 722                 goto out_fail_nl80211;
 723
 724         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
 725
 726         err = regulatory_init();
 727         if (err)
 728                 goto out_fail_reg;
 729
 730         return 0;
 731
 732 out_fail_reg:
 733         debugfs_remove(ieee80211_debugfs_dir);
 734 out_fail_nl80211:
 735         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 736 out_fail_notifier:
 737         wiphy_sysfs_exit();
 738 out_fail_sysfs:
 739         return err;
 740 }
 741
 742 subsys_initcall(cfg80211_init);
 743
 744 static void cfg80211_exit(void)
 745 {
 746         debugfs_remove(ieee80211_debugfs_dir);
 747         nl80211_exit();
 748         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 749         wiphy_sysfs_exit();
 750         regulatory_exit();
 751 }
 752 module_exit(cfg80211_exit);