net/wireless/core.c

   1 /*
   2  * This is the linux wireless configuration interface.
   3  *
   4  * Copyright 2006-2009          Johannes Berg <johannes@sipsolutions.net>
   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_drv_list);
  34
  35 /*
  36  * This is used to protect the cfg80211_drv_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_drv_by_wiphy_idx(int wiphy_idx)
  47 {
  48         struct cfg80211_registered_device *result = NULL, *drv;
  49
  50         if (!wiphy_idx_valid(wiphy_idx))
  51                 return NULL;
  52
  53         assert_cfg80211_lock();
  54
  55         list_for_each_entry(drv, &cfg80211_drv_list, list) {
  56                 if (drv->wiphy_idx == wiphy_idx) {
  57                         result = drv;
  58                         break;
  59                 }
  60         }
  61
  62         return result;
  63 }
  64
  65 int get_wiphy_idx(struct wiphy *wiphy)
  66 {
  67         struct cfg80211_registered_device *drv;
  68         if (!wiphy)
  69                 return WIPHY_IDX_STALE;
  70         drv = wiphy_to_dev(wiphy);
  71         return drv->wiphy_idx;
  72 }
  73
  74 /* requires cfg80211_drv_mutex to be held! */
  75 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  76 {
  77         struct cfg80211_registered_device *drv;
  78
  79         if (!wiphy_idx_valid(wiphy_idx))
  80                 return NULL;
  81
  82         assert_cfg80211_lock();
  83
  84         drv = cfg80211_drv_by_wiphy_idx(wiphy_idx);
  85         if (!drv)
  86                 return NULL;
  87         return &drv->wiphy;
  88 }
  89
  90 /* requires cfg80211_mutex to be held! */
  91 struct cfg80211_registered_device *
  92 __cfg80211_drv_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_drv_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 *drv;
 138
 139         mutex_lock(&cfg80211_mutex);
 140         drv = __cfg80211_drv_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(drv))
 146                 mutex_lock(&drv->mtx);
 147
 148         mutex_unlock(&cfg80211_mutex);
 149
 150         return drv;
 151 }
 152
 153 struct cfg80211_registered_device *
 154 cfg80211_get_dev_from_ifindex(int ifindex)
 155 {
 156         struct cfg80211_registered_device *drv = 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                 drv = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 165                 mutex_lock(&drv->mtx);
 166         } else
 167                 drv = ERR_PTR(-ENODEV);
 168         dev_put(dev);
 169  out:
 170         mutex_unlock(&cfg80211_mutex);
 171         return drv;
 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 *drv;
 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(drv, &cfg80211_drv_list, list)
 205                 if (strcmp(newname, dev_name(&drv->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 *drv = data;
 228
 229         drv->ops->rfkill_poll(&drv->wiphy);
 230 }
 231
 232 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 233 {
 234         struct cfg80211_registered_device *drv = data;
 235         struct wireless_dev *wdev;
 236
 237         if (!blocked)
 238                 return 0;
 239
 240         rtnl_lock();
 241         mutex_lock(&drv->devlist_mtx);
 242
 243         list_for_each_entry(wdev, &drv->netdev_list, list)
 244                 dev_close(wdev->netdev);
 245
 246         mutex_unlock(&drv->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 *drv;
 255
 256         drv = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 257         cfg80211_rfkill_set_block(drv, rfkill_blocked(drv->rfkill));
 258 }
 259
 260 /* exported functions */
 261
 262 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 263 {
 264         static int wiphy_counter;
 265
 266         struct cfg80211_registered_device *drv;
 267         int alloc_size;
 268
 269         WARN_ON(!ops->add_key && ops->del_key);
 270         WARN_ON(ops->add_key && !ops->del_key);
 271
 272         alloc_size = sizeof(*drv) + sizeof_priv;
 273
 274         drv = kzalloc(alloc_size, GFP_KERNEL);
 275         if (!drv)
 276                 return NULL;
 277
 278         drv->ops = ops;
 279
 280         mutex_lock(&cfg80211_mutex);
 281
 282         drv->wiphy_idx = wiphy_counter++;
 283
 284         if (unlikely(!wiphy_idx_valid(drv->wiphy_idx))) {
 285                 wiphy_counter--;
 286                 mutex_unlock(&cfg80211_mutex);
 287                 /* ugh, wrapped! */
 288                 kfree(drv);
 289                 return NULL;
 290         }
 291
 292         mutex_unlock(&cfg80211_mutex);
 293
 294         /* give it a proper name */
 295         dev_set_name(&drv->wiphy.dev, PHY_NAME "%d", drv->wiphy_idx);
 296
 297         mutex_init(&drv->mtx);
 298         mutex_init(&drv->devlist_mtx);
 299         INIT_LIST_HEAD(&drv->netdev_list);
 300         spin_lock_init(&drv->bss_lock);
 301         INIT_LIST_HEAD(&drv->bss_list);
 302
 303         device_initialize(&drv->wiphy.dev);
 304         drv->wiphy.dev.class = &ieee80211_class;
 305         drv->wiphy.dev.platform_data = drv;
 306
 307         drv->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 308         drv->rfkill = rfkill_alloc(dev_name(&drv->wiphy.dev),
 309                                    &drv->wiphy.dev, RFKILL_TYPE_WLAN,
 310                                    &drv->rfkill_ops, drv);
 311
 312         if (!drv->rfkill) {
 313                 kfree(drv);
 314                 return NULL;
 315         }
 316
 317         INIT_WORK(&drv->rfkill_sync, cfg80211_rfkill_sync_work);
 318         INIT_WORK(&drv->conn_work, cfg80211_conn_work);
 319
 320         /*
 321          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 322          * Fragmentation and RTS threshold are disabled by default with the
 323          * special -1 value.
 324          */
 325         drv->wiphy.retry_short = 7;
 326         drv->wiphy.retry_long = 4;
 327         drv->wiphy.frag_threshold = (u32) -1;
 328         drv->wiphy.rts_threshold = (u32) -1;
 329
 330         return &drv->wiphy;
 331 }
 332 EXPORT_SYMBOL(wiphy_new);
 333
 334 int wiphy_register(struct wiphy *wiphy)
 335 {
 336         struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
 337         int res;
 338         enum ieee80211_band band;
 339         struct ieee80211_supported_band *sband;
 340         bool have_band = false;
 341         int i;
 342         u16 ifmodes = wiphy->interface_modes;
 343
 344         /* sanity check ifmodes */
 345         WARN_ON(!ifmodes);
 346         ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
 347         if (WARN_ON(ifmodes != wiphy->interface_modes))
 348                 wiphy->interface_modes = ifmodes;
 349
 350         /* sanity check supported bands/channels */
 351         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 352                 sband = wiphy->bands[band];
 353                 if (!sband)
 354                         continue;
 355
 356                 sband->band = band;
 357
 358                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
 359                         return -EINVAL;
 360
 361                 /*
 362                  * Since we use a u32 for rate bitmaps in
 363                  * ieee80211_get_response_rate, we cannot
 364                  * have more than 32 legacy rates.
 365                  */
 366                 if (WARN_ON(sband->n_bitrates > 32))
 367                         return -EINVAL;
 368
 369                 for (i = 0; i < sband->n_channels; i++) {
 370                         sband->channels[i].orig_flags =
 371                                 sband->channels[i].flags;
 372                         sband->channels[i].orig_mag =
 373                                 sband->channels[i].max_antenna_gain;
 374                         sband->channels[i].orig_mpwr =
 375                                 sband->channels[i].max_power;
 376                         sband->channels[i].band = band;
 377                 }
 378
 379                 have_band = true;
 380         }
 381
 382         if (!have_band) {
 383                 WARN_ON(1);
 384                 return -EINVAL;
 385         }
 386
 387         /* check and set up bitrates */
 388         ieee80211_set_bitrate_flags(wiphy);
 389
 390         res = device_add(&drv->wiphy.dev);
 391         if (res)
 392                 return res;
 393
 394         res = rfkill_register(drv->rfkill);
 395         if (res)
 396                 goto out_rm_dev;
 397
 398         mutex_lock(&cfg80211_mutex);
 399
 400         /* set up regulatory info */
 401         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
 402
 403         list_add(&drv->list, &cfg80211_drv_list);
 404
 405         mutex_unlock(&cfg80211_mutex);
 406
 407         /* add to debugfs */
 408         drv->wiphy.debugfsdir =
 409                 debugfs_create_dir(wiphy_name(&drv->wiphy),
 410                                    ieee80211_debugfs_dir);
 411         if (IS_ERR(drv->wiphy.debugfsdir))
 412                 drv->wiphy.debugfsdir = NULL;
 413
 414         if (wiphy->custom_regulatory) {
 415                 struct regulatory_request request;
 416
 417                 request.wiphy_idx = get_wiphy_idx(wiphy);
 418                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 419                 request.alpha2[0] = '9';
 420                 request.alpha2[1] = '9';
 421
 422                 nl80211_send_reg_change_event(&request);
 423         }
 424
 425         cfg80211_debugfs_drv_add(drv);
 426
 427         return 0;
 428
 429  out_rm_dev:
 430         device_del(&drv->wiphy.dev);
 431         return res;
 432 }
 433 EXPORT_SYMBOL(wiphy_register);
 434
 435 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 436 {
 437         struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
 438
 439         if (!drv->ops->rfkill_poll)
 440                 return;
 441         drv->rfkill_ops.poll = cfg80211_rfkill_poll;
 442         rfkill_resume_polling(drv->rfkill);
 443 }
 444 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 445
 446 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 447 {
 448         struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
 449
 450         rfkill_pause_polling(drv->rfkill);
 451 }
 452 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 453
 454 void wiphy_unregister(struct wiphy *wiphy)
 455 {
 456         struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
 457
 458         rfkill_unregister(drv->rfkill);
 459
 460         /* protect the device list */
 461         mutex_lock(&cfg80211_mutex);
 462
 463         BUG_ON(!list_empty(&drv->netdev_list));
 464
 465         /*
 466          * Try to grab drv->mtx. If a command is still in progress,
 467          * hopefully the driver will refuse it since it's tearing
 468          * down the device already. We wait for this command to complete
 469          * before unlinking the item from the list.
 470          * Note: as codified by the BUG_ON above we cannot get here if
 471          * a virtual interface is still associated. Hence, we can only
 472          * get to lock contention here if userspace issues a command
 473          * that identified the hardware by wiphy index.
 474          */
 475         mutex_lock(&drv->mtx);
 476         /* unlock again before freeing */
 477         mutex_unlock(&drv->mtx);
 478
 479         cancel_work_sync(&drv->conn_work);
 480
 481         cfg80211_debugfs_drv_del(drv);
 482
 483         /* If this device got a regulatory hint tell core its
 484          * free to listen now to a new shiny device regulatory hint */
 485         reg_device_remove(wiphy);
 486
 487         list_del(&drv->list);
 488         device_del(&drv->wiphy.dev);
 489         debugfs_remove(drv->wiphy.debugfsdir);
 490
 491         mutex_unlock(&cfg80211_mutex);
 492 }
 493 EXPORT_SYMBOL(wiphy_unregister);
 494
 495 void cfg80211_dev_free(struct cfg80211_registered_device *drv)
 496 {
 497         struct cfg80211_internal_bss *scan, *tmp;
 498         rfkill_destroy(drv->rfkill);
 499         mutex_destroy(&drv->mtx);
 500         mutex_destroy(&drv->devlist_mtx);
 501         list_for_each_entry_safe(scan, tmp, &drv->bss_list, list)
 502                 cfg80211_put_bss(&scan->pub);
 503         kfree(drv);
 504 }
 505
 506 void wiphy_free(struct wiphy *wiphy)
 507 {
 508         put_device(&wiphy->dev);
 509 }
 510 EXPORT_SYMBOL(wiphy_free);
 511
 512 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 513 {
 514         struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
 515
 516         if (rfkill_set_hw_state(drv->rfkill, blocked))
 517                 schedule_work(&drv->rfkill_sync);
 518 }
 519 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 520
 521 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
 522                                          unsigned long state,
 523                                          void *ndev)
 524 {
 525         struct net_device *dev = ndev;
 526         struct wireless_dev *wdev = dev->ieee80211_ptr;
 527         struct cfg80211_registered_device *rdev;
 528
 529         if (!wdev)
 530                 return NOTIFY_DONE;
 531
 532         rdev = wiphy_to_dev(wdev->wiphy);
 533
 534         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 535
 536         switch (state) {
 537         case NETDEV_REGISTER:
 538                 mutex_lock(&rdev->devlist_mtx);
 539                 list_add(&wdev->list, &rdev->netdev_list);
 540                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 541                                       "phy80211")) {
 542                         printk(KERN_ERR "wireless: failed to add phy80211 "
 543                                 "symlink to netdev!\n");
 544                 }
 545                 wdev->netdev = dev;
 546                 wdev->sme_state = CFG80211_SME_IDLE;
 547                 mutex_unlock(&rdev->devlist_mtx);
 548 #ifdef CONFIG_WIRELESS_EXT
 549                 wdev->wext.default_key = -1;
 550                 wdev->wext.default_mgmt_key = -1;
 551                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 552                 wdev->wext.ps = CONFIG_CFG80211_DEFAULT_PS_VALUE;
 553                 wdev->wext.ps_timeout = 500;
 554                 if (rdev->ops->set_power_mgmt)
 555                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
 556                                                       wdev->wext.ps,
 557                                                       wdev->wext.ps_timeout)) {
 558                                 /* assume this means it's off */
 559                                 wdev->wext.ps = false;
 560                         }
 561 #endif
 562                 break;
 563         case NETDEV_GOING_DOWN:
 564                 switch (wdev->iftype) {
 565                 case NL80211_IFTYPE_ADHOC:
 566                         cfg80211_leave_ibss(rdev, dev, true);
 567                         break;
 568                 case NL80211_IFTYPE_STATION:
 569 #ifdef CONFIG_WIRELESS_EXT
 570                         kfree(wdev->wext.ie);
 571                         wdev->wext.ie = NULL;
 572                         wdev->wext.ie_len = 0;
 573                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 574 #endif
 575                         cfg80211_disconnect(rdev, dev,
 576                                             WLAN_REASON_DEAUTH_LEAVING, true);
 577                         cfg80211_mlme_down(rdev, dev);
 578                         break;
 579                 default:
 580                         break;
 581                 }
 582                 break;
 583         case NETDEV_UP:
 584 #ifdef CONFIG_WIRELESS_EXT
 585                 switch (wdev->iftype) {
 586                 case NL80211_IFTYPE_ADHOC:
 587                         if (wdev->wext.ibss.ssid_len)
 588                                 cfg80211_join_ibss(rdev, dev,
 589                                                    &wdev->wext.ibss);
 590                         break;
 591                 case NL80211_IFTYPE_STATION:
 592                         if (wdev->wext.connect.ssid_len)
 593                                 cfg80211_connect(rdev, dev,
 594                                                  &wdev->wext.connect);
 595                         break;
 596                 default:
 597                         break;
 598                 }
 599 #endif
 600                 break;
 601         case NETDEV_UNREGISTER:
 602                 mutex_lock(&rdev->devlist_mtx);
 603                 if (!list_empty(&wdev->list)) {
 604                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 605                         list_del_init(&wdev->list);
 606                 }
 607                 mutex_unlock(&rdev->devlist_mtx);
 608                 break;
 609         case NETDEV_PRE_UP:
 610                 if (rfkill_blocked(rdev->rfkill))
 611                         return notifier_from_errno(-ERFKILL);
 612                 break;
 613         }
 614
 615         return NOTIFY_DONE;
 616 }
 617
 618 static struct notifier_block cfg80211_netdev_notifier = {
 619         .notifier_call = cfg80211_netdev_notifier_call,
 620 };
 621
 622 static int cfg80211_init(void)
 623 {
 624         int err;
 625
 626         err = wiphy_sysfs_init();
 627         if (err)
 628                 goto out_fail_sysfs;
 629
 630         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
 631         if (err)
 632                 goto out_fail_notifier;
 633
 634         err = nl80211_init();
 635         if (err)
 636                 goto out_fail_nl80211;
 637
 638         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
 639
 640         err = regulatory_init();
 641         if (err)
 642                 goto out_fail_reg;
 643
 644         return 0;
 645
 646 out_fail_reg:
 647         debugfs_remove(ieee80211_debugfs_dir);
 648 out_fail_nl80211:
 649         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 650 out_fail_notifier:
 651         wiphy_sysfs_exit();
 652 out_fail_sysfs:
 653         return err;
 654 }
 655
 656 subsys_initcall(cfg80211_init);
 657
 658 static void cfg80211_exit(void)
 659 {
 660         debugfs_remove(ieee80211_debugfs_dir);
 661         nl80211_exit();
 662         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 663         wiphy_sysfs_exit();
 664         regulatory_exit();
 665 }
 666 module_exit(cfg80211_exit);