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  */
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/if.h>
  11 #include <linux/module.h>
  12 #include <linux/err.h>
  13 #include <linux/list.h>
  14 #include <linux/slab.h>
  15 #include <linux/nl80211.h>
  16 #include <linux/debugfs.h>
  17 #include <linux/notifier.h>
  18 #include <linux/device.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/sched.h>
  22 #include <net/genetlink.h>
  23 #include <net/cfg80211.h>
  24 #include "nl80211.h"
  25 #include "core.h"
  26 #include "sysfs.h"
  27 #include "debugfs.h"
  28 #include "wext-compat.h"
  29 #include "rdev-ops.h"
  30
  31 /* name for sysfs, %d is appended */
  32 #define PHY_NAME "phy"
  33
  34 MODULE_AUTHOR("Johannes Berg");
  35 MODULE_LICENSE("GPL");
  36 MODULE_DESCRIPTION("wireless configuration support");
  37 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
  38
  39 /* RCU-protected (and RTNL for writers) */
  40 LIST_HEAD(cfg80211_rdev_list);
  41 int cfg80211_rdev_list_generation;
  42
  43 /* for debugfs */
  44 static struct dentry *ieee80211_debugfs_dir;
  45
  46 /* for the cleanup, scan and event works */
  47 struct workqueue_struct *cfg80211_wq;
  48
  49 static bool cfg80211_disable_40mhz_24ghz;
  50 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  51 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  52                  "Disable 40MHz support in the 2.4GHz band");
  53
  54 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  55 {
  56         struct cfg80211_registered_device *result = NULL, *rdev;
  57
  58         ASSERT_RTNL();
  59
  60         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  61                 if (rdev->wiphy_idx == wiphy_idx) {
  62                         result = rdev;
  63                         break;
  64                 }
  65         }
  66
  67         return result;
  68 }
  69
  70 int get_wiphy_idx(struct wiphy *wiphy)
  71 {
  72         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
  73
  74         return rdev->wiphy_idx;
  75 }
  76
  77 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  78 {
  79         struct cfg80211_registered_device *rdev;
  80
  81         ASSERT_RTNL();
  82
  83         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  84         if (!rdev)
  85                 return NULL;
  86         return &rdev->wiphy;
  87 }
  88
  89 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
  90                                    const char *newname)
  91 {
  92         struct cfg80211_registered_device *rdev2;
  93         int wiphy_idx, taken = -1, digits;
  94
  95         ASSERT_RTNL();
  96
  97         /* prohibit calling the thing phy%d when %d is not its number */
  98         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
  99         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 100                 /* count number of places needed to print wiphy_idx */
 101                 digits = 1;
 102                 while (wiphy_idx /= 10)
 103                         digits++;
 104                 /*
 105                  * deny the name if it is phy<idx> where <idx> is printed
 106                  * without leading zeroes. taken == strlen(newname) here
 107                  */
 108                 if (taken == strlen(PHY_NAME) + digits)
 109                         return -EINVAL;
 110         }
 111
 112         /* Ensure another device does not already have this name. */
 113         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 114                 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
 115                         return -EINVAL;
 116
 117         return 0;
 118 }
 119
 120 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 121                         char *newname)
 122 {
 123         int result;
 124
 125         ASSERT_RTNL();
 126
 127         /* Ignore nop renames */
 128         if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
 129                 return 0;
 130
 131         result = cfg80211_dev_check_name(rdev, newname);
 132         if (result < 0)
 133                 return result;
 134
 135         result = device_rename(&rdev->wiphy.dev, newname);
 136         if (result)
 137                 return result;
 138
 139         if (rdev->wiphy.debugfsdir &&
 140             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 141                             rdev->wiphy.debugfsdir,
 142                             rdev->wiphy.debugfsdir->d_parent,
 143                             newname))
 144                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 145
 146         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 147
 148         return 0;
 149 }
 150
 151 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 152                           struct net *net)
 153 {
 154         struct wireless_dev *wdev;
 155         int err = 0;
 156
 157         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 158                 return -EOPNOTSUPP;
 159
 160         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 161                 if (!wdev->netdev)
 162                         continue;
 163                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 164                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 165                 if (err)
 166                         break;
 167                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 168         }
 169
 170         if (err) {
 171                 /* failed -- clean up to old netns */
 172                 net = wiphy_net(&rdev->wiphy);
 173
 174                 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,
 175                                                      list) {
 176                         if (!wdev->netdev)
 177                                 continue;
 178                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 179                         err = dev_change_net_namespace(wdev->netdev, net,
 180                                                         "wlan%d");
 181                         WARN_ON(err);
 182                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 183                 }
 184
 185                 return err;
 186         }
 187
 188         wiphy_net_set(&rdev->wiphy, net);
 189
 190         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 191         WARN_ON(err);
 192
 193         return 0;
 194 }
 195
 196 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 197 {
 198         struct cfg80211_registered_device *rdev = data;
 199
 200         rdev_rfkill_poll(rdev);
 201 }
 202
 203 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 204                               struct wireless_dev *wdev)
 205 {
 206         ASSERT_RTNL();
 207
 208         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 209                 return;
 210
 211         if (!wdev->p2p_started)
 212                 return;
 213
 214         rdev_stop_p2p_device(rdev, wdev);
 215         wdev->p2p_started = false;
 216
 217         rdev->opencount--;
 218
 219         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 220                 if (WARN_ON(!rdev->scan_req->notified))
 221                         rdev->scan_req->aborted = true;
 222                 ___cfg80211_scan_done(rdev, false);
 223         }
 224 }
 225
 226 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 227 {
 228         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 229         struct wireless_dev *wdev;
 230
 231         ASSERT_RTNL();
 232
 233         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 234                 if (wdev->netdev) {
 235                         dev_close(wdev->netdev);
 236                         continue;
 237                 }
 238                 /* otherwise, check iftype */
 239                 switch (wdev->iftype) {
 240                 case NL80211_IFTYPE_P2P_DEVICE:
 241                         cfg80211_stop_p2p_device(rdev, wdev);
 242                         break;
 243                 default:
 244                         break;
 245                 }
 246         }
 247 }
 248 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 249
 250 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 251 {
 252         struct cfg80211_registered_device *rdev = data;
 253
 254         if (!blocked)
 255                 return 0;
 256
 257         rtnl_lock();
 258         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 259         rtnl_unlock();
 260
 261         return 0;
 262 }
 263
 264 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 265 {
 266         struct cfg80211_registered_device *rdev;
 267
 268         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 269         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 270 }
 271
 272 static void cfg80211_event_work(struct work_struct *work)
 273 {
 274         struct cfg80211_registered_device *rdev;
 275
 276         rdev = container_of(work, struct cfg80211_registered_device,
 277                             event_work);
 278
 279         rtnl_lock();
 280         cfg80211_process_rdev_events(rdev);
 281         rtnl_unlock();
 282 }
 283
 284 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 285 {
 286         struct cfg80211_iface_destroy *item;
 287
 288         ASSERT_RTNL();
 289
 290         spin_lock_irq(&rdev->destroy_list_lock);
 291         while ((item = list_first_entry_or_null(&rdev->destroy_list,
 292                                                 struct cfg80211_iface_destroy,
 293                                                 list))) {
 294                 struct wireless_dev *wdev, *tmp;
 295                 u32 nlportid = item->nlportid;
 296
 297                 list_del(&item->list);
 298                 kfree(item);
 299                 spin_unlock_irq(&rdev->destroy_list_lock);
 300
 301                 list_for_each_entry_safe(wdev, tmp, &rdev->wdev_list, list) {
 302                         if (nlportid == wdev->owner_nlportid)
 303                                 rdev_del_virtual_intf(rdev, wdev);
 304                 }
 305
 306                 spin_lock_irq(&rdev->destroy_list_lock);
 307         }
 308         spin_unlock_irq(&rdev->destroy_list_lock);
 309 }
 310
 311 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 312 {
 313         struct cfg80211_registered_device *rdev;
 314
 315         rdev = container_of(work, struct cfg80211_registered_device,
 316                             destroy_work);
 317
 318         rtnl_lock();
 319         cfg80211_destroy_ifaces(rdev);
 320         rtnl_unlock();
 321 }
 322
 323 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
 324 {
 325         struct cfg80211_registered_device *rdev;
 326
 327         rdev = container_of(work, struct cfg80211_registered_device,
 328                            sched_scan_stop_wk);
 329
 330         rtnl_lock();
 331
 332         __cfg80211_stop_sched_scan(rdev, false);
 333
 334         rtnl_unlock();
 335 }
 336
 337 /* exported functions */
 338
 339 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 340                            const char *requested_name)
 341 {
 342         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 343
 344         struct cfg80211_registered_device *rdev;
 345         int alloc_size;
 346
 347         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 348         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 349         WARN_ON(ops->connect && !ops->disconnect);
 350         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 351         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 352         WARN_ON(ops->add_station && !ops->del_station);
 353         WARN_ON(ops->add_mpath && !ops->del_mpath);
 354         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 355
 356         alloc_size = sizeof(*rdev) + sizeof_priv;
 357
 358         rdev = kzalloc(alloc_size, GFP_KERNEL);
 359         if (!rdev)
 360                 return NULL;
 361
 362         rdev->ops = ops;
 363
 364         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 365
 366         if (unlikely(rdev->wiphy_idx < 0)) {
 367                 /* ugh, wrapped! */
 368                 atomic_dec(&wiphy_counter);
 369                 kfree(rdev);
 370                 return NULL;
 371         }
 372
 373         /* atomic_inc_return makes it start at 1, make it start at 0 */
 374         rdev->wiphy_idx--;
 375
 376         /* give it a proper name */
 377         if (requested_name && requested_name[0]) {
 378                 int rv;
 379
 380                 rtnl_lock();
 381                 rv = cfg80211_dev_check_name(rdev, requested_name);
 382
 383                 if (rv < 0) {
 384                         rtnl_unlock();
 385                         goto use_default_name;
 386                 }
 387
 388                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 389                 rtnl_unlock();
 390                 if (rv)
 391                         goto use_default_name;
 392         } else {
 393 use_default_name:
 394                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 395                  * the restrictions on phy names.  Probably this call could
 396                  * fail if some other part of the kernel (re)named a device
 397                  * phyX.  But, might should add some locking and check return
 398                  * value, and use a different name if this one exists?
 399                  */
 400                 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 401         }
 402
 403         INIT_LIST_HEAD(&rdev->wdev_list);
 404         INIT_LIST_HEAD(&rdev->beacon_registrations);
 405         spin_lock_init(&rdev->beacon_registrations_lock);
 406         spin_lock_init(&rdev->bss_lock);
 407         INIT_LIST_HEAD(&rdev->bss_list);
 408         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 409         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 410         INIT_LIST_HEAD(&rdev->mlme_unreg);
 411         spin_lock_init(&rdev->mlme_unreg_lock);
 412         INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
 413         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 414                           cfg80211_dfs_channels_update_work);
 415 #ifdef CONFIG_CFG80211_WEXT
 416         rdev->wiphy.wext = &cfg80211_wext_handler;
 417 #endif
 418
 419         device_initialize(&rdev->wiphy.dev);
 420         rdev->wiphy.dev.class = &ieee80211_class;
 421         rdev->wiphy.dev.platform_data = rdev;
 422         device_enable_async_suspend(&rdev->wiphy.dev);
 423
 424         INIT_LIST_HEAD(&rdev->destroy_list);
 425         spin_lock_init(&rdev->destroy_list_lock);
 426         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 427         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 428
 429 #ifdef CONFIG_CFG80211_DEFAULT_PS
 430         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 431 #endif
 432
 433         wiphy_net_set(&rdev->wiphy, &init_net);
 434
 435         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 436         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 437                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 438                                    &rdev->rfkill_ops, rdev);
 439
 440         if (!rdev->rfkill) {
 441                 kfree(rdev);
 442                 return NULL;
 443         }
 444
 445         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 446         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 447         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 448
 449         init_waitqueue_head(&rdev->dev_wait);
 450
 451         /*
 452          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 453          * Fragmentation and RTS threshold are disabled by default with the
 454          * special -1 value.
 455          */
 456         rdev->wiphy.retry_short = 7;
 457         rdev->wiphy.retry_long = 4;
 458         rdev->wiphy.frag_threshold = (u32) -1;
 459         rdev->wiphy.rts_threshold = (u32) -1;
 460         rdev->wiphy.coverage_class = 0;
 461
 462         rdev->wiphy.max_num_csa_counters = 1;
 463
 464         return &rdev->wiphy;
 465 }
 466 EXPORT_SYMBOL(wiphy_new_nm);
 467
 468 static int wiphy_verify_combinations(struct wiphy *wiphy)
 469 {
 470         const struct ieee80211_iface_combination *c;
 471         int i, j;
 472
 473         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 474                 u32 cnt = 0;
 475                 u16 all_iftypes = 0;
 476
 477                 c = &wiphy->iface_combinations[i];
 478
 479                 /*
 480                  * Combinations with just one interface aren't real,
 481                  * however we make an exception for DFS.
 482                  */
 483                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 484                         return -EINVAL;
 485
 486                 /* Need at least one channel */
 487                 if (WARN_ON(!c->num_different_channels))
 488                         return -EINVAL;
 489
 490                 /*
 491                  * Put a sane limit on maximum number of different
 492                  * channels to simplify channel accounting code.
 493                  */
 494                 if (WARN_ON(c->num_different_channels >
 495                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 496                         return -EINVAL;
 497
 498                 /* DFS only works on one channel. */
 499                 if (WARN_ON(c->radar_detect_widths &&
 500                             (c->num_different_channels > 1)))
 501                         return -EINVAL;
 502
 503                 if (WARN_ON(!c->n_limits))
 504                         return -EINVAL;
 505
 506                 for (j = 0; j < c->n_limits; j++) {
 507                         u16 types = c->limits[j].types;
 508
 509                         /* interface types shouldn't overlap */
 510                         if (WARN_ON(types & all_iftypes))
 511                                 return -EINVAL;
 512                         all_iftypes |= types;
 513
 514                         if (WARN_ON(!c->limits[j].max))
 515                                 return -EINVAL;
 516
 517                         /* Shouldn't list software iftypes in combinations! */
 518                         if (WARN_ON(wiphy->software_iftypes & types))
 519                                 return -EINVAL;
 520
 521                         /* Only a single P2P_DEVICE can be allowed */
 522                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 523                                     c->limits[j].max > 1))
 524                                 return -EINVAL;
 525
 526                         cnt += c->limits[j].max;
 527                         /*
 528                          * Don't advertise an unsupported type
 529                          * in a combination.
 530                          */
 531                         if (WARN_ON((wiphy->interface_modes & types) != types))
 532                                 return -EINVAL;
 533                 }
 534
 535                 /* You can't even choose that many! */
 536                 if (WARN_ON(cnt < c->max_interfaces))
 537                         return -EINVAL;
 538         }
 539
 540         return 0;
 541 }
 542
 543 int wiphy_register(struct wiphy *wiphy)
 544 {
 545         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 546         int res;
 547         enum ieee80211_band band;
 548         struct ieee80211_supported_band *sband;
 549         bool have_band = false;
 550         int i;
 551         u16 ifmodes = wiphy->interface_modes;
 552
 553 #ifdef CONFIG_PM
 554         if (WARN_ON(wiphy->wowlan &&
 555                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 556                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 557                 return -EINVAL;
 558         if (WARN_ON(wiphy->wowlan &&
 559                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 560                     !wiphy->wowlan->tcp))
 561                 return -EINVAL;
 562 #endif
 563         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 564                     (!rdev->ops->tdls_channel_switch ||
 565                      !rdev->ops->tdls_cancel_channel_switch)))
 566                 return -EINVAL;
 567
 568         /*
 569          * if a wiphy has unsupported modes for regulatory channel enforcement,
 570          * opt-out of enforcement checking
 571          */
 572         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 573                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 574                                        BIT(NL80211_IFTYPE_AP) |
 575                                        BIT(NL80211_IFTYPE_P2P_GO) |
 576                                        BIT(NL80211_IFTYPE_ADHOC) |
 577                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 578                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 579                                        BIT(NL80211_IFTYPE_MONITOR)))
 580                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 581
 582         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 583                     (wiphy->regulatory_flags &
 584                                         (REGULATORY_CUSTOM_REG |
 585                                          REGULATORY_STRICT_REG |
 586                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 587                                          REGULATORY_COUNTRY_IE_IGNORE))))
 588                 return -EINVAL;
 589
 590         if (WARN_ON(wiphy->coalesce &&
 591                     (!wiphy->coalesce->n_rules ||
 592                      !wiphy->coalesce->n_patterns) &&
 593                     (!wiphy->coalesce->pattern_min_len ||
 594                      wiphy->coalesce->pattern_min_len >
 595                         wiphy->coalesce->pattern_max_len)))
 596                 return -EINVAL;
 597
 598         if (WARN_ON(wiphy->ap_sme_capa &&
 599                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 600                 return -EINVAL;
 601
 602         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 603                 return -EINVAL;
 604
 605         if (WARN_ON(wiphy->addresses &&
 606                     !is_zero_ether_addr(wiphy->perm_addr) &&
 607                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 608                            ETH_ALEN)))
 609                 return -EINVAL;
 610
 611         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 612                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 613                      !rdev->ops->set_mac_acl)))
 614                 return -EINVAL;
 615
 616         if (wiphy->addresses)
 617                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 618
 619         /* sanity check ifmodes */
 620         WARN_ON(!ifmodes);
 621         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 622         if (WARN_ON(ifmodes != wiphy->interface_modes))
 623                 wiphy->interface_modes = ifmodes;
 624
 625         res = wiphy_verify_combinations(wiphy);
 626         if (res)
 627                 return res;
 628
 629         /* sanity check supported bands/channels */
 630         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 631                 sband = wiphy->bands[band];
 632                 if (!sband)
 633                         continue;
 634
 635                 sband->band = band;
 636                 if (WARN_ON(!sband->n_channels))
 637                         return -EINVAL;
 638                 /*
 639                  * on 60gHz band, there are no legacy rates, so
 640                  * n_bitrates is 0
 641                  */
 642                 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
 643                             !sband->n_bitrates))
 644                         return -EINVAL;
 645
 646                 /*
 647                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 648                  * modify the sband's ht data even if the driver uses a
 649                  * global structure for that.
 650                  */
 651                 if (cfg80211_disable_40mhz_24ghz &&
 652                     band == IEEE80211_BAND_2GHZ &&
 653                     sband->ht_cap.ht_supported) {
 654                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 655                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 656                 }
 657
 658                 /*
 659                  * Since we use a u32 for rate bitmaps in
 660                  * ieee80211_get_response_rate, we cannot
 661                  * have more than 32 legacy rates.
 662                  */
 663                 if (WARN_ON(sband->n_bitrates > 32))
 664                         return -EINVAL;
 665
 666                 for (i = 0; i < sband->n_channels; i++) {
 667                         sband->channels[i].orig_flags =
 668                                 sband->channels[i].flags;
 669                         sband->channels[i].orig_mag = INT_MAX;
 670                         sband->channels[i].orig_mpwr =
 671                                 sband->channels[i].max_power;
 672                         sband->channels[i].band = band;
 673                 }
 674
 675                 have_band = true;
 676         }
 677
 678         if (!have_band) {
 679                 WARN_ON(1);
 680                 return -EINVAL;
 681         }
 682
 683 #ifdef CONFIG_PM
 684         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 685                     (!rdev->wiphy.wowlan->pattern_min_len ||
 686                      rdev->wiphy.wowlan->pattern_min_len >
 687                                 rdev->wiphy.wowlan->pattern_max_len)))
 688                 return -EINVAL;
 689 #endif
 690
 691         /* check and set up bitrates */
 692         ieee80211_set_bitrate_flags(wiphy);
 693
 694         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 695
 696         rtnl_lock();
 697         res = device_add(&rdev->wiphy.dev);
 698         if (res) {
 699                 rtnl_unlock();
 700                 return res;
 701         }
 702
 703         /* set up regulatory info */
 704         wiphy_regulatory_register(wiphy);
 705
 706         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 707         cfg80211_rdev_list_generation++;
 708
 709         /* add to debugfs */
 710         rdev->wiphy.debugfsdir =
 711                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 712                                    ieee80211_debugfs_dir);
 713         if (IS_ERR(rdev->wiphy.debugfsdir))
 714                 rdev->wiphy.debugfsdir = NULL;
 715
 716         cfg80211_debugfs_rdev_add(rdev);
 717         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 718
 719         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 720                 struct regulatory_request request;
 721
 722                 request.wiphy_idx = get_wiphy_idx(wiphy);
 723                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 724                 request.alpha2[0] = '9';
 725                 request.alpha2[1] = '9';
 726
 727                 nl80211_send_reg_change_event(&request);
 728         }
 729
 730         rdev->wiphy.registered = true;
 731         rtnl_unlock();
 732
 733         res = rfkill_register(rdev->rfkill);
 734         if (res) {
 735                 rfkill_destroy(rdev->rfkill);
 736                 rdev->rfkill = NULL;
 737                 wiphy_unregister(&rdev->wiphy);
 738                 return res;
 739         }
 740
 741         return 0;
 742 }
 743 EXPORT_SYMBOL(wiphy_register);
 744
 745 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 746 {
 747         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 748
 749         if (!rdev->ops->rfkill_poll)
 750                 return;
 751         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 752         rfkill_resume_polling(rdev->rfkill);
 753 }
 754 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 755
 756 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 757 {
 758         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 759
 760         rfkill_pause_polling(rdev->rfkill);
 761 }
 762 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 763
 764 void wiphy_unregister(struct wiphy *wiphy)
 765 {
 766         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 767
 768         wait_event(rdev->dev_wait, ({
 769                 int __count;
 770                 rtnl_lock();
 771                 __count = rdev->opencount;
 772                 rtnl_unlock();
 773                 __count == 0; }));
 774
 775         if (rdev->rfkill)
 776                 rfkill_unregister(rdev->rfkill);
 777
 778         rtnl_lock();
 779         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 780         rdev->wiphy.registered = false;
 781
 782         WARN_ON(!list_empty(&rdev->wdev_list));
 783
 784         /*
 785          * First remove the hardware from everywhere, this makes
 786          * it impossible to find from userspace.
 787          */
 788         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 789         list_del_rcu(&rdev->list);
 790         synchronize_rcu();
 791
 792         /*
 793          * If this device got a regulatory hint tell core its
 794          * free to listen now to a new shiny device regulatory hint
 795          */
 796         wiphy_regulatory_deregister(wiphy);
 797
 798         cfg80211_rdev_list_generation++;
 799         device_del(&rdev->wiphy.dev);
 800
 801         rtnl_unlock();
 802
 803         flush_work(&rdev->scan_done_wk);
 804         cancel_work_sync(&rdev->conn_work);
 805         flush_work(&rdev->event_work);
 806         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 807         flush_work(&rdev->destroy_work);
 808         flush_work(&rdev->sched_scan_stop_wk);
 809         flush_work(&rdev->mlme_unreg_wk);
 810
 811 #ifdef CONFIG_PM
 812         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
 813                 rdev_set_wakeup(rdev, false);
 814 #endif
 815         cfg80211_rdev_free_wowlan(rdev);
 816         cfg80211_rdev_free_coalesce(rdev);
 817 }
 818 EXPORT_SYMBOL(wiphy_unregister);
 819
 820 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 821 {
 822         struct cfg80211_internal_bss *scan, *tmp;
 823         struct cfg80211_beacon_registration *reg, *treg;
 824         rfkill_destroy(rdev->rfkill);
 825         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 826                 list_del(&reg->list);
 827                 kfree(reg);
 828         }
 829         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 830                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 831         kfree(rdev);
 832 }
 833
 834 void wiphy_free(struct wiphy *wiphy)
 835 {
 836         put_device(&wiphy->dev);
 837 }
 838 EXPORT_SYMBOL(wiphy_free);
 839
 840 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 841 {
 842         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 843
 844         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 845                 schedule_work(&rdev->rfkill_sync);
 846 }
 847 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 848
 849 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 850 {
 851         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 852
 853         ASSERT_RTNL();
 854
 855         if (WARN_ON(wdev->netdev))
 856                 return;
 857
 858         list_del_rcu(&wdev->list);
 859         rdev->devlist_generation++;
 860
 861         switch (wdev->iftype) {
 862         case NL80211_IFTYPE_P2P_DEVICE:
 863                 cfg80211_mlme_purge_registrations(wdev);
 864                 cfg80211_stop_p2p_device(rdev, wdev);
 865                 break;
 866         default:
 867                 WARN_ON_ONCE(1);
 868                 break;
 869         }
 870 }
 871 EXPORT_SYMBOL(cfg80211_unregister_wdev);
 872
 873 static const struct device_type wiphy_type = {
 874         .name   = "wlan",
 875 };
 876
 877 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 878                                enum nl80211_iftype iftype, int num)
 879 {
 880         ASSERT_RTNL();
 881
 882         rdev->num_running_ifaces += num;
 883         if (iftype == NL80211_IFTYPE_MONITOR)
 884                 rdev->num_running_monitor_ifaces += num;
 885 }
 886
 887 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
 888                       struct wireless_dev *wdev)
 889 {
 890         struct net_device *dev = wdev->netdev;
 891         struct cfg80211_sched_scan_request *sched_scan_req;
 892
 893         ASSERT_RTNL();
 894         ASSERT_WDEV_LOCK(wdev);
 895
 896         switch (wdev->iftype) {
 897         case NL80211_IFTYPE_ADHOC:
 898                 __cfg80211_leave_ibss(rdev, dev, true);
 899                 break;
 900         case NL80211_IFTYPE_P2P_CLIENT:
 901         case NL80211_IFTYPE_STATION:
 902                 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
 903                 if (sched_scan_req && dev == sched_scan_req->dev)
 904                         __cfg80211_stop_sched_scan(rdev, false);
 905
 906 #ifdef CONFIG_CFG80211_WEXT
 907                 kfree(wdev->wext.ie);
 908                 wdev->wext.ie = NULL;
 909                 wdev->wext.ie_len = 0;
 910                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 911 #endif
 912                 cfg80211_disconnect(rdev, dev,
 913                                     WLAN_REASON_DEAUTH_LEAVING, true);
 914                 break;
 915         case NL80211_IFTYPE_MESH_POINT:
 916                 __cfg80211_leave_mesh(rdev, dev);
 917                 break;
 918         case NL80211_IFTYPE_AP:
 919         case NL80211_IFTYPE_P2P_GO:
 920                 __cfg80211_stop_ap(rdev, dev, true);
 921                 break;
 922         case NL80211_IFTYPE_OCB:
 923                 __cfg80211_leave_ocb(rdev, dev);
 924                 break;
 925         case NL80211_IFTYPE_WDS:
 926                 /* must be handled by mac80211/driver, has no APIs */
 927                 break;
 928         case NL80211_IFTYPE_P2P_DEVICE:
 929                 /* cannot happen, has no netdev */
 930                 break;
 931         case NL80211_IFTYPE_AP_VLAN:
 932         case NL80211_IFTYPE_MONITOR:
 933                 /* nothing to do */
 934                 break;
 935         case NL80211_IFTYPE_UNSPECIFIED:
 936         case NUM_NL80211_IFTYPES:
 937                 /* invalid */
 938                 break;
 939         }
 940 }
 941
 942 void cfg80211_leave(struct cfg80211_registered_device *rdev,
 943                     struct wireless_dev *wdev)
 944 {
 945         wdev_lock(wdev);
 946         __cfg80211_leave(rdev, wdev);
 947         wdev_unlock(wdev);
 948 }
 949
 950 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
 951                          gfp_t gfp)
 952 {
 953         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 954         struct cfg80211_event *ev;
 955         unsigned long flags;
 956
 957         trace_cfg80211_stop_iface(wiphy, wdev);
 958
 959         ev = kzalloc(sizeof(*ev), gfp);
 960         if (!ev)
 961                 return;
 962
 963         ev->type = EVENT_STOPPED;
 964
 965         spin_lock_irqsave(&wdev->event_lock, flags);
 966         list_add_tail(&ev->list, &wdev->event_list);
 967         spin_unlock_irqrestore(&wdev->event_lock, flags);
 968         queue_work(cfg80211_wq, &rdev->event_work);
 969 }
 970 EXPORT_SYMBOL(cfg80211_stop_iface);
 971
 972 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 973                                          unsigned long state, void *ptr)
 974 {
 975         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 976         struct wireless_dev *wdev = dev->ieee80211_ptr;
 977         struct cfg80211_registered_device *rdev;
 978         struct cfg80211_sched_scan_request *sched_scan_req;
 979
 980         if (!wdev)
 981                 return NOTIFY_DONE;
 982
 983         rdev = wiphy_to_rdev(wdev->wiphy);
 984
 985         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 986
 987         switch (state) {
 988         case NETDEV_POST_INIT:
 989                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 990                 break;
 991         case NETDEV_REGISTER:
 992                 /*
 993                  * NB: cannot take rdev->mtx here because this may be
 994                  * called within code protected by it when interfaces
 995                  * are added with nl80211.
 996                  */
 997                 mutex_init(&wdev->mtx);
 998                 INIT_LIST_HEAD(&wdev->event_list);
 999                 spin_lock_init(&wdev->event_lock);
1000                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1001                 spin_lock_init(&wdev->mgmt_registrations_lock);
1002
1003                 wdev->identifier = ++rdev->wdev_id;
1004                 list_add_rcu(&wdev->list, &rdev->wdev_list);
1005                 rdev->devlist_generation++;
1006                 /* can only change netns with wiphy */
1007                 dev->features |= NETIF_F_NETNS_LOCAL;
1008
1009                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1010                                       "phy80211")) {
1011                         pr_err("failed to add phy80211 symlink to netdev!\n");
1012                 }
1013                 wdev->netdev = dev;
1014 #ifdef CONFIG_CFG80211_WEXT
1015                 wdev->wext.default_key = -1;
1016                 wdev->wext.default_mgmt_key = -1;
1017                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1018 #endif
1019
1020                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1021                         wdev->ps = true;
1022                 else
1023                         wdev->ps = false;
1024                 /* allow mac80211 to determine the timeout */
1025                 wdev->ps_timeout = -1;
1026
1027                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1028                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1029                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1030                         dev->priv_flags |= IFF_DONT_BRIDGE;
1031                 break;
1032         case NETDEV_GOING_DOWN:
1033                 cfg80211_leave(rdev, wdev);
1034                 break;
1035         case NETDEV_DOWN:
1036                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1037                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1038                         if (WARN_ON(!rdev->scan_req->notified))
1039                                 rdev->scan_req->aborted = true;
1040                         ___cfg80211_scan_done(rdev, false);
1041                 }
1042
1043                 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1044                 if (WARN_ON(sched_scan_req &&
1045                             sched_scan_req->dev == wdev->netdev)) {
1046                         __cfg80211_stop_sched_scan(rdev, false);
1047                 }
1048
1049                 rdev->opencount--;
1050                 wake_up(&rdev->dev_wait);
1051                 break;
1052         case NETDEV_UP:
1053                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1054                 wdev_lock(wdev);
1055                 switch (wdev->iftype) {
1056 #ifdef CONFIG_CFG80211_WEXT
1057                 case NL80211_IFTYPE_ADHOC:
1058                         cfg80211_ibss_wext_join(rdev, wdev);
1059                         break;
1060                 case NL80211_IFTYPE_STATION:
1061                         cfg80211_mgd_wext_connect(rdev, wdev);
1062                         break;
1063 #endif
1064 #ifdef CONFIG_MAC80211_MESH
1065                 case NL80211_IFTYPE_MESH_POINT:
1066                         {
1067                                 /* backward compat code... */
1068                                 struct mesh_setup setup;
1069                                 memcpy(&setup, &default_mesh_setup,
1070                                                 sizeof(setup));
1071                                  /* back compat only needed for mesh_id */
1072                                 setup.mesh_id = wdev->ssid;
1073                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1074                                 if (wdev->mesh_id_up_len)
1075                                         __cfg80211_join_mesh(rdev, dev,
1076                                                         &setup,
1077                                                         &default_mesh_config);
1078                                 break;
1079                         }
1080 #endif
1081                 default:
1082                         break;
1083                 }
1084                 wdev_unlock(wdev);
1085                 rdev->opencount++;
1086
1087                 /*
1088                  * Configure power management to the driver here so that its
1089                  * correctly set also after interface type changes etc.
1090                  */
1091                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1092                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1093                     rdev->ops->set_power_mgmt)
1094                         if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
1095                                                 wdev->ps_timeout)) {
1096                                 /* assume this means it's off */
1097                                 wdev->ps = false;
1098                         }
1099                 break;
1100         case NETDEV_UNREGISTER:
1101                 /*
1102                  * It is possible to get NETDEV_UNREGISTER
1103                  * multiple times. To detect that, check
1104                  * that the interface is still on the list
1105                  * of registered interfaces, and only then
1106                  * remove and clean it up.
1107                  */
1108                 if (!list_empty(&wdev->list)) {
1109                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1110                         list_del_rcu(&wdev->list);
1111                         rdev->devlist_generation++;
1112                         cfg80211_mlme_purge_registrations(wdev);
1113 #ifdef CONFIG_CFG80211_WEXT
1114                         kzfree(wdev->wext.keys);
1115 #endif
1116                 }
1117                 /*
1118                  * synchronise (so that we won't find this netdev
1119                  * from other code any more) and then clear the list
1120                  * head so that the above code can safely check for
1121                  * !list_empty() to avoid double-cleanup.
1122                  */
1123                 synchronize_rcu();
1124                 INIT_LIST_HEAD(&wdev->list);
1125                 /*
1126                  * Ensure that all events have been processed and
1127                  * freed.
1128                  */
1129                 cfg80211_process_wdev_events(wdev);
1130
1131                 if (WARN_ON(wdev->current_bss)) {
1132                         cfg80211_unhold_bss(wdev->current_bss);
1133                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1134                         wdev->current_bss = NULL;
1135                 }
1136                 break;
1137         case NETDEV_PRE_UP:
1138                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1139                         return notifier_from_errno(-EOPNOTSUPP);
1140                 if (rfkill_blocked(rdev->rfkill))
1141                         return notifier_from_errno(-ERFKILL);
1142                 break;
1143         default:
1144                 return NOTIFY_DONE;
1145         }
1146
1147         return NOTIFY_OK;
1148 }
1149
1150 static struct notifier_block cfg80211_netdev_notifier = {
1151         .notifier_call = cfg80211_netdev_notifier_call,
1152 };
1153
1154 static void __net_exit cfg80211_pernet_exit(struct net *net)
1155 {
1156         struct cfg80211_registered_device *rdev;
1157
1158         rtnl_lock();
1159         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1160                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1161                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1162         }
1163         rtnl_unlock();
1164 }
1165
1166 static struct pernet_operations cfg80211_pernet_ops = {
1167         .exit = cfg80211_pernet_exit,
1168 };
1169
1170 static int __init cfg80211_init(void)
1171 {
1172         int err;
1173
1174         err = register_pernet_device(&cfg80211_pernet_ops);
1175         if (err)
1176                 goto out_fail_pernet;
1177
1178         err = wiphy_sysfs_init();
1179         if (err)
1180                 goto out_fail_sysfs;
1181
1182         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1183         if (err)
1184                 goto out_fail_notifier;
1185
1186         err = nl80211_init();
1187         if (err)
1188                 goto out_fail_nl80211;
1189
1190         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1191
1192         err = regulatory_init();
1193         if (err)
1194                 goto out_fail_reg;
1195
1196         cfg80211_wq = create_singlethread_workqueue("cfg80211");
1197         if (!cfg80211_wq) {
1198                 err = -ENOMEM;
1199                 goto out_fail_wq;
1200         }
1201
1202         return 0;
1203
1204 out_fail_wq:
1205         regulatory_exit();
1206 out_fail_reg:
1207         debugfs_remove(ieee80211_debugfs_dir);
1208         nl80211_exit();
1209 out_fail_nl80211:
1210         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1211 out_fail_notifier:
1212         wiphy_sysfs_exit();
1213 out_fail_sysfs:
1214         unregister_pernet_device(&cfg80211_pernet_ops);
1215 out_fail_pernet:
1216         return err;
1217 }
1218 subsys_initcall(cfg80211_init);
1219
1220 static void __exit cfg80211_exit(void)
1221 {
1222         debugfs_remove(ieee80211_debugfs_dir);
1223         nl80211_exit();
1224         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1225         wiphy_sysfs_exit();
1226         regulatory_exit();
1227         unregister_pernet_device(&cfg80211_pernet_ops);
1228         destroy_workqueue(cfg80211_wq);
1229 }
1230 module_exit(cfg80211_exit);