net/wireless/core.c

   1 /*
   2  * This is the linux wireless configuration interface.
   3  *
   4  * Copyright 2006-2010          Johannes Berg <johannes@sipsolutions.net>
   5  * Copyright 2013-2014  Intel Mobile Communications GmbH
   6  * Copyright 2015       Intel Deutschland GmbH
   7  */
   8
   9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  10
  11 #include <linux/if.h>
  12 #include <linux/module.h>
  13 #include <linux/err.h>
  14 #include <linux/list.h>
  15 #include <linux/slab.h>
  16 #include <linux/nl80211.h>
  17 #include <linux/debugfs.h>
  18 #include <linux/notifier.h>
  19 #include <linux/device.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/sched.h>
  23 #include <net/genetlink.h>
  24 #include <net/cfg80211.h>
  25 #include "nl80211.h"
  26 #include "core.h"
  27 #include "sysfs.h"
  28 #include "debugfs.h"
  29 #include "wext-compat.h"
  30 #include "rdev-ops.h"
  31
  32 /* name for sysfs, %d is appended */
  33 #define PHY_NAME "phy"
  34
  35 MODULE_AUTHOR("Johannes Berg");
  36 MODULE_LICENSE("GPL");
  37 MODULE_DESCRIPTION("wireless configuration support");
  38 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
  39
  40 /* RCU-protected (and RTNL for writers) */
  41 LIST_HEAD(cfg80211_rdev_list);
  42 int cfg80211_rdev_list_generation;
  43
  44 /* for debugfs */
  45 static struct dentry *ieee80211_debugfs_dir;
  46
  47 /* for the cleanup, scan and event works */
  48 struct workqueue_struct *cfg80211_wq;
  49
  50 static bool cfg80211_disable_40mhz_24ghz;
  51 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  52 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  53                  "Disable 40MHz support in the 2.4GHz band");
  54
  55 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  56 {
  57         struct cfg80211_registered_device *result = NULL, *rdev;
  58
  59         ASSERT_RTNL();
  60
  61         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  62                 if (rdev->wiphy_idx == wiphy_idx) {
  63                         result = rdev;
  64                         break;
  65                 }
  66         }
  67
  68         return result;
  69 }
  70
  71 int get_wiphy_idx(struct wiphy *wiphy)
  72 {
  73         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
  74
  75         return rdev->wiphy_idx;
  76 }
  77
  78 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  79 {
  80         struct cfg80211_registered_device *rdev;
  81
  82         ASSERT_RTNL();
  83
  84         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  85         if (!rdev)
  86                 return NULL;
  87         return &rdev->wiphy;
  88 }
  89
  90 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
  91                                    const char *newname)
  92 {
  93         struct cfg80211_registered_device *rdev2;
  94         int wiphy_idx, taken = -1, digits;
  95
  96         ASSERT_RTNL();
  97
  98         if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
  99                 return -EINVAL;
 100
 101         /* prohibit calling the thing phy%d when %d is not its number */
 102         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 103         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 104                 /* count number of places needed to print wiphy_idx */
 105                 digits = 1;
 106                 while (wiphy_idx /= 10)
 107                         digits++;
 108                 /*
 109                  * deny the name if it is phy<idx> where <idx> is printed
 110                  * without leading zeroes. taken == strlen(newname) here
 111                  */
 112                 if (taken == strlen(PHY_NAME) + digits)
 113                         return -EINVAL;
 114         }
 115
 116         /* Ensure another device does not already have this name. */
 117         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 118                 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
 119                         return -EINVAL;
 120
 121         return 0;
 122 }
 123
 124 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 125                         char *newname)
 126 {
 127         int result;
 128
 129         ASSERT_RTNL();
 130
 131         /* Ignore nop renames */
 132         if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
 133                 return 0;
 134
 135         result = cfg80211_dev_check_name(rdev, newname);
 136         if (result < 0)
 137                 return result;
 138
 139         result = device_rename(&rdev->wiphy.dev, newname);
 140         if (result)
 141                 return result;
 142
 143         if (rdev->wiphy.debugfsdir &&
 144             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 145                             rdev->wiphy.debugfsdir,
 146                             rdev->wiphy.debugfsdir->d_parent,
 147                             newname))
 148                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 149
 150         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 151
 152         return 0;
 153 }
 154
 155 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 156                           struct net *net)
 157 {
 158         struct wireless_dev *wdev;
 159         int err = 0;
 160
 161         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 162                 return -EOPNOTSUPP;
 163
 164         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 165                 if (!wdev->netdev)
 166                         continue;
 167                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 168                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 169                 if (err)
 170                         break;
 171                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 172         }
 173
 174         if (err) {
 175                 /* failed -- clean up to old netns */
 176                 net = wiphy_net(&rdev->wiphy);
 177
 178                 list_for_each_entry_continue_reverse(wdev,
 179                                                      &rdev->wiphy.wdev_list,
 180                                                      list) {
 181                         if (!wdev->netdev)
 182                                 continue;
 183                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 184                         err = dev_change_net_namespace(wdev->netdev, net,
 185                                                         "wlan%d");
 186                         WARN_ON(err);
 187                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 188                 }
 189
 190                 return err;
 191         }
 192
 193         wiphy_net_set(&rdev->wiphy, net);
 194
 195         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 196         WARN_ON(err);
 197
 198         return 0;
 199 }
 200
 201 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 202 {
 203         struct cfg80211_registered_device *rdev = data;
 204
 205         rdev_rfkill_poll(rdev);
 206 }
 207
 208 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 209                               struct wireless_dev *wdev)
 210 {
 211         ASSERT_RTNL();
 212
 213         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 214                 return;
 215
 216         if (!wdev->p2p_started)
 217                 return;
 218
 219         rdev_stop_p2p_device(rdev, wdev);
 220         wdev->p2p_started = false;
 221
 222         rdev->opencount--;
 223
 224         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 225                 if (WARN_ON(!rdev->scan_req->notified))
 226                         rdev->scan_req->aborted = true;
 227                 ___cfg80211_scan_done(rdev, false);
 228         }
 229 }
 230
 231 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 232 {
 233         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 234         struct wireless_dev *wdev;
 235
 236         ASSERT_RTNL();
 237
 238         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 239                 if (wdev->netdev) {
 240                         dev_close(wdev->netdev);
 241                         continue;
 242                 }
 243                 /* otherwise, check iftype */
 244                 switch (wdev->iftype) {
 245                 case NL80211_IFTYPE_P2P_DEVICE:
 246                         cfg80211_stop_p2p_device(rdev, wdev);
 247                         break;
 248                 default:
 249                         break;
 250                 }
 251         }
 252 }
 253 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 254
 255 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 256 {
 257         struct cfg80211_registered_device *rdev = data;
 258
 259         if (!blocked)
 260                 return 0;
 261
 262         rtnl_lock();
 263         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 264         rtnl_unlock();
 265
 266         return 0;
 267 }
 268
 269 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 270 {
 271         struct cfg80211_registered_device *rdev;
 272
 273         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 274         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 275 }
 276
 277 static void cfg80211_event_work(struct work_struct *work)
 278 {
 279         struct cfg80211_registered_device *rdev;
 280
 281         rdev = container_of(work, struct cfg80211_registered_device,
 282                             event_work);
 283
 284         rtnl_lock();
 285         cfg80211_process_rdev_events(rdev);
 286         rtnl_unlock();
 287 }
 288
 289 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 290 {
 291         struct cfg80211_iface_destroy *item;
 292
 293         ASSERT_RTNL();
 294
 295         spin_lock_irq(&rdev->destroy_list_lock);
 296         while ((item = list_first_entry_or_null(&rdev->destroy_list,
 297                                                 struct cfg80211_iface_destroy,
 298                                                 list))) {
 299                 struct wireless_dev *wdev, *tmp;
 300                 u32 nlportid = item->nlportid;
 301
 302                 list_del(&item->list);
 303                 kfree(item);
 304                 spin_unlock_irq(&rdev->destroy_list_lock);
 305
 306                 list_for_each_entry_safe(wdev, tmp,
 307                                          &rdev->wiphy.wdev_list, list) {
 308                         if (nlportid == wdev->owner_nlportid)
 309                                 rdev_del_virtual_intf(rdev, wdev);
 310                 }
 311
 312                 spin_lock_irq(&rdev->destroy_list_lock);
 313         }
 314         spin_unlock_irq(&rdev->destroy_list_lock);
 315 }
 316
 317 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 318 {
 319         struct cfg80211_registered_device *rdev;
 320
 321         rdev = container_of(work, struct cfg80211_registered_device,
 322                             destroy_work);
 323
 324         rtnl_lock();
 325         cfg80211_destroy_ifaces(rdev);
 326         rtnl_unlock();
 327 }
 328
 329 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
 330 {
 331         struct cfg80211_registered_device *rdev;
 332
 333         rdev = container_of(work, struct cfg80211_registered_device,
 334                            sched_scan_stop_wk);
 335
 336         rtnl_lock();
 337
 338         __cfg80211_stop_sched_scan(rdev, false);
 339
 340         rtnl_unlock();
 341 }
 342
 343 /* exported functions */
 344
 345 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 346                            const char *requested_name)
 347 {
 348         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 349
 350         struct cfg80211_registered_device *rdev;
 351         int alloc_size;
 352
 353         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 354         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 355         WARN_ON(ops->connect && !ops->disconnect);
 356         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 357         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 358         WARN_ON(ops->add_station && !ops->del_station);
 359         WARN_ON(ops->add_mpath && !ops->del_mpath);
 360         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 361
 362         alloc_size = sizeof(*rdev) + sizeof_priv;
 363
 364         rdev = kzalloc(alloc_size, GFP_KERNEL);
 365         if (!rdev)
 366                 return NULL;
 367
 368         rdev->ops = ops;
 369
 370         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 371
 372         if (unlikely(rdev->wiphy_idx < 0)) {
 373                 /* ugh, wrapped! */
 374                 atomic_dec(&wiphy_counter);
 375                 kfree(rdev);
 376                 return NULL;
 377         }
 378
 379         /* atomic_inc_return makes it start at 1, make it start at 0 */
 380         rdev->wiphy_idx--;
 381
 382         /* give it a proper name */
 383         if (requested_name && requested_name[0]) {
 384                 int rv;
 385
 386                 rtnl_lock();
 387                 rv = cfg80211_dev_check_name(rdev, requested_name);
 388
 389                 if (rv < 0) {
 390                         rtnl_unlock();
 391                         goto use_default_name;
 392                 }
 393
 394                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 395                 rtnl_unlock();
 396                 if (rv)
 397                         goto use_default_name;
 398         } else {
 399                 int rv;
 400
 401 use_default_name:
 402                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 403                  * the restrictions on phy names.  Probably this call could
 404                  * fail if some other part of the kernel (re)named a device
 405                  * phyX.  But, might should add some locking and check return
 406                  * value, and use a different name if this one exists?
 407                  */
 408                 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 409                 if (rv < 0) {
 410                         kfree(rdev);
 411                         return NULL;
 412                 }
 413         }
 414
 415         INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
 416         INIT_LIST_HEAD(&rdev->beacon_registrations);
 417         spin_lock_init(&rdev->beacon_registrations_lock);
 418         spin_lock_init(&rdev->bss_lock);
 419         INIT_LIST_HEAD(&rdev->bss_list);
 420         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 421         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 422         INIT_LIST_HEAD(&rdev->mlme_unreg);
 423         spin_lock_init(&rdev->mlme_unreg_lock);
 424         INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
 425         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 426                           cfg80211_dfs_channels_update_work);
 427 #ifdef CONFIG_CFG80211_WEXT
 428         rdev->wiphy.wext = &cfg80211_wext_handler;
 429 #endif
 430
 431         device_initialize(&rdev->wiphy.dev);
 432         rdev->wiphy.dev.class = &ieee80211_class;
 433         rdev->wiphy.dev.platform_data = rdev;
 434         device_enable_async_suspend(&rdev->wiphy.dev);
 435
 436         INIT_LIST_HEAD(&rdev->destroy_list);
 437         spin_lock_init(&rdev->destroy_list_lock);
 438         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 439         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 440
 441 #ifdef CONFIG_CFG80211_DEFAULT_PS
 442         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 443 #endif
 444
 445         wiphy_net_set(&rdev->wiphy, &init_net);
 446
 447         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 448         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 449                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 450                                    &rdev->rfkill_ops, rdev);
 451
 452         if (!rdev->rfkill) {
 453                 kfree(rdev);
 454                 return NULL;
 455         }
 456
 457         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 458         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 459         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 460
 461         init_waitqueue_head(&rdev->dev_wait);
 462
 463         /*
 464          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 465          * Fragmentation and RTS threshold are disabled by default with the
 466          * special -1 value.
 467          */
 468         rdev->wiphy.retry_short = 7;
 469         rdev->wiphy.retry_long = 4;
 470         rdev->wiphy.frag_threshold = (u32) -1;
 471         rdev->wiphy.rts_threshold = (u32) -1;
 472         rdev->wiphy.coverage_class = 0;
 473
 474         rdev->wiphy.max_num_csa_counters = 1;
 475
 476         rdev->wiphy.max_sched_scan_plans = 1;
 477         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 478
 479         return &rdev->wiphy;
 480 }
 481 EXPORT_SYMBOL(wiphy_new_nm);
 482
 483 static int wiphy_verify_combinations(struct wiphy *wiphy)
 484 {
 485         const struct ieee80211_iface_combination *c;
 486         int i, j;
 487
 488         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 489                 u32 cnt = 0;
 490                 u16 all_iftypes = 0;
 491
 492                 c = &wiphy->iface_combinations[i];
 493
 494                 /*
 495                  * Combinations with just one interface aren't real,
 496                  * however we make an exception for DFS.
 497                  */
 498                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 499                         return -EINVAL;
 500
 501                 /* Need at least one channel */
 502                 if (WARN_ON(!c->num_different_channels))
 503                         return -EINVAL;
 504
 505                 /*
 506                  * Put a sane limit on maximum number of different
 507                  * channels to simplify channel accounting code.
 508                  */
 509                 if (WARN_ON(c->num_different_channels >
 510                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 511                         return -EINVAL;
 512
 513                 /* DFS only works on one channel. */
 514                 if (WARN_ON(c->radar_detect_widths &&
 515                             (c->num_different_channels > 1)))
 516                         return -EINVAL;
 517
 518                 if (WARN_ON(!c->n_limits))
 519                         return -EINVAL;
 520
 521                 for (j = 0; j < c->n_limits; j++) {
 522                         u16 types = c->limits[j].types;
 523
 524                         /* interface types shouldn't overlap */
 525                         if (WARN_ON(types & all_iftypes))
 526                                 return -EINVAL;
 527                         all_iftypes |= types;
 528
 529                         if (WARN_ON(!c->limits[j].max))
 530                                 return -EINVAL;
 531
 532                         /* Shouldn't list software iftypes in combinations! */
 533                         if (WARN_ON(wiphy->software_iftypes & types))
 534                                 return -EINVAL;
 535
 536                         /* Only a single P2P_DEVICE can be allowed */
 537                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 538                                     c->limits[j].max > 1))
 539                                 return -EINVAL;
 540
 541                         cnt += c->limits[j].max;
 542                         /*
 543                          * Don't advertise an unsupported type
 544                          * in a combination.
 545                          */
 546                         if (WARN_ON((wiphy->interface_modes & types) != types))
 547                                 return -EINVAL;
 548                 }
 549
 550                 /* You can't even choose that many! */
 551                 if (WARN_ON(cnt < c->max_interfaces))
 552                         return -EINVAL;
 553         }
 554
 555         return 0;
 556 }
 557
 558 int wiphy_register(struct wiphy *wiphy)
 559 {
 560         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 561         int res;
 562         enum ieee80211_band band;
 563         struct ieee80211_supported_band *sband;
 564         bool have_band = false;
 565         int i;
 566         u16 ifmodes = wiphy->interface_modes;
 567
 568 #ifdef CONFIG_PM
 569         if (WARN_ON(wiphy->wowlan &&
 570                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 571                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 572                 return -EINVAL;
 573         if (WARN_ON(wiphy->wowlan &&
 574                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 575                     !wiphy->wowlan->tcp))
 576                 return -EINVAL;
 577 #endif
 578         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 579                     (!rdev->ops->tdls_channel_switch ||
 580                      !rdev->ops->tdls_cancel_channel_switch)))
 581                 return -EINVAL;
 582
 583         /*
 584          * if a wiphy has unsupported modes for regulatory channel enforcement,
 585          * opt-out of enforcement checking
 586          */
 587         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 588                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 589                                        BIT(NL80211_IFTYPE_AP) |
 590                                        BIT(NL80211_IFTYPE_P2P_GO) |
 591                                        BIT(NL80211_IFTYPE_ADHOC) |
 592                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 593                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 594                                        BIT(NL80211_IFTYPE_MONITOR)))
 595                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 596
 597         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 598                     (wiphy->regulatory_flags &
 599                                         (REGULATORY_CUSTOM_REG |
 600                                          REGULATORY_STRICT_REG |
 601                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 602                                          REGULATORY_COUNTRY_IE_IGNORE))))
 603                 return -EINVAL;
 604
 605         if (WARN_ON(wiphy->coalesce &&
 606                     (!wiphy->coalesce->n_rules ||
 607                      !wiphy->coalesce->n_patterns) &&
 608                     (!wiphy->coalesce->pattern_min_len ||
 609                      wiphy->coalesce->pattern_min_len >
 610                         wiphy->coalesce->pattern_max_len)))
 611                 return -EINVAL;
 612
 613         if (WARN_ON(wiphy->ap_sme_capa &&
 614                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 615                 return -EINVAL;
 616
 617         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 618                 return -EINVAL;
 619
 620         if (WARN_ON(wiphy->addresses &&
 621                     !is_zero_ether_addr(wiphy->perm_addr) &&
 622                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 623                            ETH_ALEN)))
 624                 return -EINVAL;
 625
 626         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 627                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 628                      !rdev->ops->set_mac_acl)))
 629                 return -EINVAL;
 630
 631         /* assure only valid behaviours are flagged by driver
 632          * hence subtract 2 as bit 0 is invalid.
 633          */
 634         if (WARN_ON(wiphy->bss_select_support &&
 635                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 636                 return -EINVAL;
 637
 638         if (wiphy->addresses)
 639                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 640
 641         /* sanity check ifmodes */
 642         WARN_ON(!ifmodes);
 643         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 644         if (WARN_ON(ifmodes != wiphy->interface_modes))
 645                 wiphy->interface_modes = ifmodes;
 646
 647         res = wiphy_verify_combinations(wiphy);
 648         if (res)
 649                 return res;
 650
 651         /* sanity check supported bands/channels */
 652         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 653                 sband = wiphy->bands[band];
 654                 if (!sband)
 655                         continue;
 656
 657                 sband->band = band;
 658                 if (WARN_ON(!sband->n_channels))
 659                         return -EINVAL;
 660                 /*
 661                  * on 60GHz band, there are no legacy rates, so
 662                  * n_bitrates is 0
 663                  */
 664                 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
 665                             !sband->n_bitrates))
 666                         return -EINVAL;
 667
 668                 /*
 669                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 670                  * modify the sband's ht data even if the driver uses a
 671                  * global structure for that.
 672                  */
 673                 if (cfg80211_disable_40mhz_24ghz &&
 674                     band == IEEE80211_BAND_2GHZ &&
 675                     sband->ht_cap.ht_supported) {
 676                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 677                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 678                 }
 679
 680                 /*
 681                  * Since we use a u32 for rate bitmaps in
 682                  * ieee80211_get_response_rate, we cannot
 683                  * have more than 32 legacy rates.
 684                  */
 685                 if (WARN_ON(sband->n_bitrates > 32))
 686                         return -EINVAL;
 687
 688                 for (i = 0; i < sband->n_channels; i++) {
 689                         sband->channels[i].orig_flags =
 690                                 sband->channels[i].flags;
 691                         sband->channels[i].orig_mag = INT_MAX;
 692                         sband->channels[i].orig_mpwr =
 693                                 sband->channels[i].max_power;
 694                         sband->channels[i].band = band;
 695                 }
 696
 697                 have_band = true;
 698         }
 699
 700         if (!have_band) {
 701                 WARN_ON(1);
 702                 return -EINVAL;
 703         }
 704
 705 #ifdef CONFIG_PM
 706         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 707                     (!rdev->wiphy.wowlan->pattern_min_len ||
 708                      rdev->wiphy.wowlan->pattern_min_len >
 709                                 rdev->wiphy.wowlan->pattern_max_len)))
 710                 return -EINVAL;
 711 #endif
 712
 713         /* check and set up bitrates */
 714         ieee80211_set_bitrate_flags(wiphy);
 715
 716         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 717
 718         rtnl_lock();
 719         res = device_add(&rdev->wiphy.dev);
 720         if (res) {
 721                 rtnl_unlock();
 722                 return res;
 723         }
 724
 725         /* set up regulatory info */
 726         wiphy_regulatory_register(wiphy);
 727
 728         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 729         cfg80211_rdev_list_generation++;
 730
 731         /* add to debugfs */
 732         rdev->wiphy.debugfsdir =
 733                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 734                                    ieee80211_debugfs_dir);
 735         if (IS_ERR(rdev->wiphy.debugfsdir))
 736                 rdev->wiphy.debugfsdir = NULL;
 737
 738         cfg80211_debugfs_rdev_add(rdev);
 739         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 740
 741         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 742                 struct regulatory_request request;
 743
 744                 request.wiphy_idx = get_wiphy_idx(wiphy);
 745                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 746                 request.alpha2[0] = '9';
 747                 request.alpha2[1] = '9';
 748
 749                 nl80211_send_reg_change_event(&request);
 750         }
 751
 752         /* Check that nobody globally advertises any capabilities they do not
 753          * advertise on all possible interface types.
 754          */
 755         if (wiphy->extended_capabilities_len &&
 756             wiphy->num_iftype_ext_capab &&
 757             wiphy->iftype_ext_capab) {
 758                 u8 supported_on_all, j;
 759                 const struct wiphy_iftype_ext_capab *capab;
 760
 761                 capab = wiphy->iftype_ext_capab;
 762                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
 763                         if (capab[0].extended_capabilities_len > j)
 764                                 supported_on_all =
 765                                         capab[0].extended_capabilities[j];
 766                         else
 767                                 supported_on_all = 0x00;
 768                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
 769                                 if (j >= capab[i].extended_capabilities_len) {
 770                                         supported_on_all = 0x00;
 771                                         break;
 772                                 }
 773                                 supported_on_all &=
 774                                         capab[i].extended_capabilities[j];
 775                         }
 776                         if (WARN_ON(wiphy->extended_capabilities[j] &
 777                                     ~supported_on_all))
 778                                 break;
 779                 }
 780         }
 781
 782         rdev->wiphy.registered = true;
 783         rtnl_unlock();
 784
 785         res = rfkill_register(rdev->rfkill);
 786         if (res) {
 787                 rfkill_destroy(rdev->rfkill);
 788                 rdev->rfkill = NULL;
 789                 wiphy_unregister(&rdev->wiphy);
 790                 return res;
 791         }
 792
 793         return 0;
 794 }
 795 EXPORT_SYMBOL(wiphy_register);
 796
 797 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 798 {
 799         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 800
 801         if (!rdev->ops->rfkill_poll)
 802                 return;
 803         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 804         rfkill_resume_polling(rdev->rfkill);
 805 }
 806 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 807
 808 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 809 {
 810         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 811
 812         rfkill_pause_polling(rdev->rfkill);
 813 }
 814 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 815
 816 void wiphy_unregister(struct wiphy *wiphy)
 817 {
 818         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 819
 820         wait_event(rdev->dev_wait, ({
 821                 int __count;
 822                 rtnl_lock();
 823                 __count = rdev->opencount;
 824                 rtnl_unlock();
 825                 __count == 0; }));
 826
 827         if (rdev->rfkill)
 828                 rfkill_unregister(rdev->rfkill);
 829
 830         rtnl_lock();
 831         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 832         rdev->wiphy.registered = false;
 833
 834         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
 835
 836         /*
 837          * First remove the hardware from everywhere, this makes
 838          * it impossible to find from userspace.
 839          */
 840         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 841         list_del_rcu(&rdev->list);
 842         synchronize_rcu();
 843
 844         /*
 845          * If this device got a regulatory hint tell core its
 846          * free to listen now to a new shiny device regulatory hint
 847          */
 848         wiphy_regulatory_deregister(wiphy);
 849
 850         cfg80211_rdev_list_generation++;
 851         device_del(&rdev->wiphy.dev);
 852
 853         rtnl_unlock();
 854
 855         flush_work(&rdev->scan_done_wk);
 856         cancel_work_sync(&rdev->conn_work);
 857         flush_work(&rdev->event_work);
 858         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 859         flush_work(&rdev->destroy_work);
 860         flush_work(&rdev->sched_scan_stop_wk);
 861         flush_work(&rdev->mlme_unreg_wk);
 862
 863 #ifdef CONFIG_PM
 864         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
 865                 rdev_set_wakeup(rdev, false);
 866 #endif
 867         cfg80211_rdev_free_wowlan(rdev);
 868         cfg80211_rdev_free_coalesce(rdev);
 869 }
 870 EXPORT_SYMBOL(wiphy_unregister);
 871
 872 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 873 {
 874         struct cfg80211_internal_bss *scan, *tmp;
 875         struct cfg80211_beacon_registration *reg, *treg;
 876         rfkill_destroy(rdev->rfkill);
 877         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 878                 list_del(&reg->list);
 879                 kfree(reg);
 880         }
 881         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 882                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 883         kfree(rdev);
 884 }
 885
 886 void wiphy_free(struct wiphy *wiphy)
 887 {
 888         put_device(&wiphy->dev);
 889 }
 890 EXPORT_SYMBOL(wiphy_free);
 891
 892 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 893 {
 894         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 895
 896         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 897                 schedule_work(&rdev->rfkill_sync);
 898 }
 899 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 900
 901 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 902 {
 903         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 904
 905         ASSERT_RTNL();
 906
 907         if (WARN_ON(wdev->netdev))
 908                 return;
 909
 910         list_del_rcu(&wdev->list);
 911         rdev->devlist_generation++;
 912
 913         switch (wdev->iftype) {
 914         case NL80211_IFTYPE_P2P_DEVICE:
 915                 cfg80211_mlme_purge_registrations(wdev);
 916                 cfg80211_stop_p2p_device(rdev, wdev);
 917                 break;
 918         default:
 919                 WARN_ON_ONCE(1);
 920                 break;
 921         }
 922 }
 923 EXPORT_SYMBOL(cfg80211_unregister_wdev);
 924
 925 static const struct device_type wiphy_type = {
 926         .name   = "wlan",
 927 };
 928
 929 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 930                                enum nl80211_iftype iftype, int num)
 931 {
 932         ASSERT_RTNL();
 933
 934         rdev->num_running_ifaces += num;
 935         if (iftype == NL80211_IFTYPE_MONITOR)
 936                 rdev->num_running_monitor_ifaces += num;
 937 }
 938
 939 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
 940                       struct wireless_dev *wdev)
 941 {
 942         struct net_device *dev = wdev->netdev;
 943         struct cfg80211_sched_scan_request *sched_scan_req;
 944
 945         ASSERT_RTNL();
 946         ASSERT_WDEV_LOCK(wdev);
 947
 948         switch (wdev->iftype) {
 949         case NL80211_IFTYPE_ADHOC:
 950                 __cfg80211_leave_ibss(rdev, dev, true);
 951                 break;
 952         case NL80211_IFTYPE_P2P_CLIENT:
 953         case NL80211_IFTYPE_STATION:
 954                 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
 955                 if (sched_scan_req && dev == sched_scan_req->dev)
 956                         __cfg80211_stop_sched_scan(rdev, false);
 957 #ifdef CONFIG_CFG80211_WEXT
 958                 kfree(wdev->wext.ie);
 959                 wdev->wext.ie = NULL;
 960                 wdev->wext.ie_len = 0;
 961                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 962 #endif
 963                 cfg80211_disconnect(rdev, dev,
 964                                     WLAN_REASON_DEAUTH_LEAVING, true);
 965                 cfg80211_mlme_down(rdev, dev);
 966                 break;
 967         case NL80211_IFTYPE_MESH_POINT:
 968                 __cfg80211_leave_mesh(rdev, dev);
 969                 break;
 970         case NL80211_IFTYPE_AP:
 971         case NL80211_IFTYPE_P2P_GO:
 972                 __cfg80211_stop_ap(rdev, dev, true);
 973                 break;
 974         case NL80211_IFTYPE_OCB:
 975                 __cfg80211_leave_ocb(rdev, dev);
 976                 break;
 977         case NL80211_IFTYPE_WDS:
 978                 /* must be handled by mac80211/driver, has no APIs */
 979                 break;
 980         case NL80211_IFTYPE_P2P_DEVICE:
 981                 /* cannot happen, has no netdev */
 982                 break;
 983         case NL80211_IFTYPE_AP_VLAN:
 984         case NL80211_IFTYPE_MONITOR:
 985                 /* nothing to do */
 986                 break;
 987         case NL80211_IFTYPE_UNSPECIFIED:
 988         case NUM_NL80211_IFTYPES:
 989                 /* invalid */
 990                 break;
 991         }
 992         wdev->beacon_interval = 0;
 993 }
 994
 995 void cfg80211_leave(struct cfg80211_registered_device *rdev,
 996                     struct wireless_dev *wdev)
 997 {
 998         wdev_lock(wdev);
 999         __cfg80211_leave(rdev, wdev);
1000         wdev_unlock(wdev);
1001 }
1002
1003 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1004                          gfp_t gfp)
1005 {
1006         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1007         struct cfg80211_event *ev;
1008         unsigned long flags;
1009
1010         trace_cfg80211_stop_iface(wiphy, wdev);
1011
1012         ev = kzalloc(sizeof(*ev), gfp);
1013         if (!ev)
1014                 return;
1015
1016         ev->type = EVENT_STOPPED;
1017
1018         spin_lock_irqsave(&wdev->event_lock, flags);
1019         list_add_tail(&ev->list, &wdev->event_list);
1020         spin_unlock_irqrestore(&wdev->event_lock, flags);
1021         queue_work(cfg80211_wq, &rdev->event_work);
1022 }
1023 EXPORT_SYMBOL(cfg80211_stop_iface);
1024
1025 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1026                                          unsigned long state, void *ptr)
1027 {
1028         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1029         struct wireless_dev *wdev = dev->ieee80211_ptr;
1030         struct cfg80211_registered_device *rdev;
1031         struct cfg80211_sched_scan_request *sched_scan_req;
1032
1033         if (!wdev)
1034                 return NOTIFY_DONE;
1035
1036         rdev = wiphy_to_rdev(wdev->wiphy);
1037
1038         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1039
1040         switch (state) {
1041         case NETDEV_POST_INIT:
1042                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1043                 break;
1044         case NETDEV_REGISTER:
1045                 /*
1046                  * NB: cannot take rdev->mtx here because this may be
1047                  * called within code protected by it when interfaces
1048                  * are added with nl80211.
1049                  */
1050                 mutex_init(&wdev->mtx);
1051                 INIT_LIST_HEAD(&wdev->event_list);
1052                 spin_lock_init(&wdev->event_lock);
1053                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1054                 spin_lock_init(&wdev->mgmt_registrations_lock);
1055
1056                 wdev->identifier = ++rdev->wdev_id;
1057                 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1058                 rdev->devlist_generation++;
1059                 /* can only change netns with wiphy */
1060                 dev->features |= NETIF_F_NETNS_LOCAL;
1061
1062                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1063                                       "phy80211")) {
1064                         pr_err("failed to add phy80211 symlink to netdev!\n");
1065                 }
1066                 wdev->netdev = dev;
1067 #ifdef CONFIG_CFG80211_WEXT
1068                 wdev->wext.default_key = -1;
1069                 wdev->wext.default_mgmt_key = -1;
1070                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1071 #endif
1072
1073                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1074                         wdev->ps = true;
1075                 else
1076                         wdev->ps = false;
1077                 /* allow mac80211 to determine the timeout */
1078                 wdev->ps_timeout = -1;
1079
1080                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1081                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1082                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1083                         dev->priv_flags |= IFF_DONT_BRIDGE;
1084                 break;
1085         case NETDEV_GOING_DOWN:
1086                 cfg80211_leave(rdev, wdev);
1087                 break;
1088         case NETDEV_DOWN:
1089                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1090                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1091                         if (WARN_ON(!rdev->scan_req->notified))
1092                                 rdev->scan_req->aborted = true;
1093                         ___cfg80211_scan_done(rdev, false);
1094                 }
1095
1096                 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1097                 if (WARN_ON(sched_scan_req &&
1098                             sched_scan_req->dev == wdev->netdev)) {
1099                         __cfg80211_stop_sched_scan(rdev, false);
1100                 }
1101
1102                 rdev->opencount--;
1103                 wake_up(&rdev->dev_wait);
1104                 break;
1105         case NETDEV_UP:
1106                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1107                 wdev_lock(wdev);
1108                 switch (wdev->iftype) {
1109 #ifdef CONFIG_CFG80211_WEXT
1110                 case NL80211_IFTYPE_ADHOC:
1111                         cfg80211_ibss_wext_join(rdev, wdev);
1112                         break;
1113                 case NL80211_IFTYPE_STATION:
1114                         cfg80211_mgd_wext_connect(rdev, wdev);
1115                         break;
1116 #endif
1117 #ifdef CONFIG_MAC80211_MESH
1118                 case NL80211_IFTYPE_MESH_POINT:
1119                         {
1120                                 /* backward compat code... */
1121                                 struct mesh_setup setup;
1122                                 memcpy(&setup, &default_mesh_setup,
1123                                                 sizeof(setup));
1124                                  /* back compat only needed for mesh_id */
1125                                 setup.mesh_id = wdev->ssid;
1126                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1127                                 if (wdev->mesh_id_up_len)
1128                                         __cfg80211_join_mesh(rdev, dev,
1129                                                         &setup,
1130                                                         &default_mesh_config);
1131                                 break;
1132                         }
1133 #endif
1134                 default:
1135                         break;
1136                 }
1137                 wdev_unlock(wdev);
1138                 rdev->opencount++;
1139
1140                 /*
1141                  * Configure power management to the driver here so that its
1142                  * correctly set also after interface type changes etc.
1143                  */
1144                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1145                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1146                     rdev->ops->set_power_mgmt)
1147                         if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
1148                                                 wdev->ps_timeout)) {
1149                                 /* assume this means it's off */
1150                                 wdev->ps = false;
1151                         }
1152                 break;
1153         case NETDEV_UNREGISTER:
1154                 /*
1155                  * It is possible to get NETDEV_UNREGISTER
1156                  * multiple times. To detect that, check
1157                  * that the interface is still on the list
1158                  * of registered interfaces, and only then
1159                  * remove and clean it up.
1160                  */
1161                 if (!list_empty(&wdev->list)) {
1162                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1163                         list_del_rcu(&wdev->list);
1164                         rdev->devlist_generation++;
1165                         cfg80211_mlme_purge_registrations(wdev);
1166 #ifdef CONFIG_CFG80211_WEXT
1167                         kzfree(wdev->wext.keys);
1168 #endif
1169                 }
1170                 /*
1171                  * synchronise (so that we won't find this netdev
1172                  * from other code any more) and then clear the list
1173                  * head so that the above code can safely check for
1174                  * !list_empty() to avoid double-cleanup.
1175                  */
1176                 synchronize_rcu();
1177                 INIT_LIST_HEAD(&wdev->list);
1178                 /*
1179                  * Ensure that all events have been processed and
1180                  * freed.
1181                  */
1182                 cfg80211_process_wdev_events(wdev);
1183
1184                 if (WARN_ON(wdev->current_bss)) {
1185                         cfg80211_unhold_bss(wdev->current_bss);
1186                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1187                         wdev->current_bss = NULL;
1188                 }
1189                 break;
1190         case NETDEV_PRE_UP:
1191                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1192                         return notifier_from_errno(-EOPNOTSUPP);
1193                 if (rfkill_blocked(rdev->rfkill))
1194                         return notifier_from_errno(-ERFKILL);
1195                 break;
1196         default:
1197                 return NOTIFY_DONE;
1198         }
1199
1200         wireless_nlevent_flush();
1201
1202         return NOTIFY_OK;
1203 }
1204
1205 static struct notifier_block cfg80211_netdev_notifier = {
1206         .notifier_call = cfg80211_netdev_notifier_call,
1207 };
1208
1209 static void __net_exit cfg80211_pernet_exit(struct net *net)
1210 {
1211         struct cfg80211_registered_device *rdev;
1212
1213         rtnl_lock();
1214         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1215                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1216                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1217         }
1218         rtnl_unlock();
1219 }
1220
1221 static struct pernet_operations cfg80211_pernet_ops = {
1222         .exit = cfg80211_pernet_exit,
1223 };
1224
1225 static int __init cfg80211_init(void)
1226 {
1227         int err;
1228
1229         err = register_pernet_device(&cfg80211_pernet_ops);
1230         if (err)
1231                 goto out_fail_pernet;
1232
1233         err = wiphy_sysfs_init();
1234         if (err)
1235                 goto out_fail_sysfs;
1236
1237         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1238         if (err)
1239                 goto out_fail_notifier;
1240
1241         err = nl80211_init();
1242         if (err)
1243                 goto out_fail_nl80211;
1244
1245         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1246
1247         err = regulatory_init();
1248         if (err)
1249                 goto out_fail_reg;
1250
1251         cfg80211_wq = create_singlethread_workqueue("cfg80211");
1252         if (!cfg80211_wq) {
1253                 err = -ENOMEM;
1254                 goto out_fail_wq;
1255         }
1256
1257         return 0;
1258
1259 out_fail_wq:
1260         regulatory_exit();
1261 out_fail_reg:
1262         debugfs_remove(ieee80211_debugfs_dir);
1263         nl80211_exit();
1264 out_fail_nl80211:
1265         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1266 out_fail_notifier:
1267         wiphy_sysfs_exit();
1268 out_fail_sysfs:
1269         unregister_pernet_device(&cfg80211_pernet_ops);
1270 out_fail_pernet:
1271         return err;
1272 }
1273 subsys_initcall(cfg80211_init);
1274
1275 static void __exit cfg80211_exit(void)
1276 {
1277         debugfs_remove(ieee80211_debugfs_dir);
1278         nl80211_exit();
1279         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1280         wiphy_sysfs_exit();
1281         regulatory_exit();
1282         unregister_pernet_device(&cfg80211_pernet_ops);
1283         destroy_workqueue(cfg80211_wq);
1284 }
1285 module_exit(cfg80211_exit);