net/wireless/core.c

   1 /*
   2  * This is the linux wireless configuration interface.
   3  *
   4  * Copyright 2006-2010          Johannes Berg <johannes@sipsolutions.net>
   5  */
   6
   7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   8
   9 #include <linux/if.h>
  10 #include <linux/module.h>
  11 #include <linux/err.h>
  12 #include <linux/list.h>
  13 #include <linux/slab.h>
  14 #include <linux/nl80211.h>
  15 #include <linux/debugfs.h>
  16 #include <linux/notifier.h>
  17 #include <linux/device.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/sched.h>
  21 #include <net/genetlink.h>
  22 #include <net/cfg80211.h>
  23 #include "nl80211.h"
  24 #include "core.h"
  25 #include "sysfs.h"
  26 #include "debugfs.h"
  27 #include "wext-compat.h"
  28 #include "ethtool.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_dev(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 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
  90                         char *newname)
  91 {
  92         struct cfg80211_registered_device *rdev2;
  93         int wiphy_idx, taken = -1, result, 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
 113         /* Ignore nop renames */
 114         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
 115                 return 0;
 116
 117         /* Ensure another device does not already have this name. */
 118         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 119                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
 120                         return -EINVAL;
 121
 122         result = device_rename(&rdev->wiphy.dev, newname);
 123         if (result)
 124                 return result;
 125
 126         if (rdev->wiphy.debugfsdir &&
 127             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 128                             rdev->wiphy.debugfsdir,
 129                             rdev->wiphy.debugfsdir->d_parent,
 130                             newname))
 131                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 132
 133         nl80211_notify_dev_rename(rdev);
 134
 135         return 0;
 136 }
 137
 138 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 139                           struct net *net)
 140 {
 141         struct wireless_dev *wdev;
 142         int err = 0;
 143
 144         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 145                 return -EOPNOTSUPP;
 146
 147         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 148                 if (!wdev->netdev)
 149                         continue;
 150                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 151                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 152                 if (err)
 153                         break;
 154                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 155         }
 156
 157         if (err) {
 158                 /* failed -- clean up to old netns */
 159                 net = wiphy_net(&rdev->wiphy);
 160
 161                 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,
 162                                                      list) {
 163                         if (!wdev->netdev)
 164                                 continue;
 165                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 166                         err = dev_change_net_namespace(wdev->netdev, net,
 167                                                         "wlan%d");
 168                         WARN_ON(err);
 169                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 170                 }
 171
 172                 return err;
 173         }
 174
 175         wiphy_net_set(&rdev->wiphy, net);
 176
 177         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 178         WARN_ON(err);
 179
 180         return 0;
 181 }
 182
 183 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 184 {
 185         struct cfg80211_registered_device *rdev = data;
 186
 187         rdev_rfkill_poll(rdev);
 188 }
 189
 190 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 191                               struct wireless_dev *wdev)
 192 {
 193         ASSERT_RTNL();
 194
 195         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 196                 return;
 197
 198         if (!wdev->p2p_started)
 199                 return;
 200
 201         rdev_stop_p2p_device(rdev, wdev);
 202         wdev->p2p_started = false;
 203
 204         rdev->opencount--;
 205
 206         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 207                 /*
 208                  * If the scan request wasn't notified as done, set it
 209                  * to aborted and leak it after a warning. The driver
 210                  * should have notified us that it ended at the latest
 211                  * during rdev_stop_p2p_device().
 212                  */
 213                 if (WARN_ON(!rdev->scan_req->notified))
 214                         rdev->scan_req->aborted = true;
 215                 ___cfg80211_scan_done(rdev, !rdev->scan_req->notified);
 216         }
 217 }
 218
 219 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 220 {
 221         struct cfg80211_registered_device *rdev = data;
 222         struct wireless_dev *wdev;
 223
 224         if (!blocked)
 225                 return 0;
 226
 227         rtnl_lock();
 228
 229         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 230                 if (wdev->netdev) {
 231                         dev_close(wdev->netdev);
 232                         continue;
 233                 }
 234                 /* otherwise, check iftype */
 235                 switch (wdev->iftype) {
 236                 case NL80211_IFTYPE_P2P_DEVICE:
 237                         cfg80211_stop_p2p_device(rdev, wdev);
 238                         break;
 239                 default:
 240                         break;
 241                 }
 242         }
 243
 244         rtnl_unlock();
 245
 246         return 0;
 247 }
 248
 249 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 250 {
 251         struct cfg80211_registered_device *rdev;
 252
 253         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 254         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 255 }
 256
 257 static void cfg80211_event_work(struct work_struct *work)
 258 {
 259         struct cfg80211_registered_device *rdev;
 260
 261         rdev = container_of(work, struct cfg80211_registered_device,
 262                             event_work);
 263
 264         rtnl_lock();
 265         cfg80211_process_rdev_events(rdev);
 266         rtnl_unlock();
 267 }
 268
 269 /* exported functions */
 270
 271 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 272 {
 273         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 274
 275         struct cfg80211_registered_device *rdev;
 276         int alloc_size;
 277
 278         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 279         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 280         WARN_ON(ops->connect && !ops->disconnect);
 281         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 282         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 283         WARN_ON(ops->add_station && !ops->del_station);
 284         WARN_ON(ops->add_mpath && !ops->del_mpath);
 285         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 286
 287         alloc_size = sizeof(*rdev) + sizeof_priv;
 288
 289         rdev = kzalloc(alloc_size, GFP_KERNEL);
 290         if (!rdev)
 291                 return NULL;
 292
 293         rdev->ops = ops;
 294
 295         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 296
 297         if (unlikely(rdev->wiphy_idx < 0)) {
 298                 /* ugh, wrapped! */
 299                 atomic_dec(&wiphy_counter);
 300                 kfree(rdev);
 301                 return NULL;
 302         }
 303
 304         /* give it a proper name */
 305         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 306
 307         INIT_LIST_HEAD(&rdev->wdev_list);
 308         INIT_LIST_HEAD(&rdev->beacon_registrations);
 309         spin_lock_init(&rdev->beacon_registrations_lock);
 310         spin_lock_init(&rdev->bss_lock);
 311         INIT_LIST_HEAD(&rdev->bss_list);
 312         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 313         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 314         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 315                           cfg80211_dfs_channels_update_work);
 316 #ifdef CONFIG_CFG80211_WEXT
 317         rdev->wiphy.wext = &cfg80211_wext_handler;
 318 #endif
 319
 320         device_initialize(&rdev->wiphy.dev);
 321         rdev->wiphy.dev.class = &ieee80211_class;
 322         rdev->wiphy.dev.platform_data = rdev;
 323
 324 #ifdef CONFIG_CFG80211_DEFAULT_PS
 325         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 326 #endif
 327
 328         wiphy_net_set(&rdev->wiphy, &init_net);
 329
 330         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 331         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 332                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 333                                    &rdev->rfkill_ops, rdev);
 334
 335         if (!rdev->rfkill) {
 336                 kfree(rdev);
 337                 return NULL;
 338         }
 339
 340         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 341         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 342         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 343
 344         init_waitqueue_head(&rdev->dev_wait);
 345
 346         /*
 347          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 348          * Fragmentation and RTS threshold are disabled by default with the
 349          * special -1 value.
 350          */
 351         rdev->wiphy.retry_short = 7;
 352         rdev->wiphy.retry_long = 4;
 353         rdev->wiphy.frag_threshold = (u32) -1;
 354         rdev->wiphy.rts_threshold = (u32) -1;
 355         rdev->wiphy.coverage_class = 0;
 356
 357         rdev->wiphy.features = NL80211_FEATURE_SCAN_FLUSH;
 358
 359         return &rdev->wiphy;
 360 }
 361 EXPORT_SYMBOL(wiphy_new);
 362
 363 static int wiphy_verify_combinations(struct wiphy *wiphy)
 364 {
 365         const struct ieee80211_iface_combination *c;
 366         int i, j;
 367
 368         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 369                 u32 cnt = 0;
 370                 u16 all_iftypes = 0;
 371
 372                 c = &wiphy->iface_combinations[i];
 373
 374                 /*
 375                  * Combinations with just one interface aren't real,
 376                  * however we make an exception for DFS.
 377                  */
 378                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 379                         return -EINVAL;
 380
 381                 /* Need at least one channel */
 382                 if (WARN_ON(!c->num_different_channels))
 383                         return -EINVAL;
 384
 385                 /*
 386                  * Put a sane limit on maximum number of different
 387                  * channels to simplify channel accounting code.
 388                  */
 389                 if (WARN_ON(c->num_different_channels >
 390                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 391                         return -EINVAL;
 392
 393                 /* DFS only works on one channel. */
 394                 if (WARN_ON(c->radar_detect_widths &&
 395                             (c->num_different_channels > 1)))
 396                         return -EINVAL;
 397
 398                 if (WARN_ON(!c->n_limits))
 399                         return -EINVAL;
 400
 401                 for (j = 0; j < c->n_limits; j++) {
 402                         u16 types = c->limits[j].types;
 403
 404                         /*
 405                          * interface types shouldn't overlap, this is
 406                          * used in cfg80211_can_change_interface()
 407                          */
 408                         if (WARN_ON(types & all_iftypes))
 409                                 return -EINVAL;
 410                         all_iftypes |= types;
 411
 412                         if (WARN_ON(!c->limits[j].max))
 413                                 return -EINVAL;
 414
 415                         /* Shouldn't list software iftypes in combinations! */
 416                         if (WARN_ON(wiphy->software_iftypes & types))
 417                                 return -EINVAL;
 418
 419                         /* Only a single P2P_DEVICE can be allowed */
 420                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 421                                     c->limits[j].max > 1))
 422                                 return -EINVAL;
 423
 424                         cnt += c->limits[j].max;
 425                         /*
 426                          * Don't advertise an unsupported type
 427                          * in a combination.
 428                          */
 429                         if (WARN_ON((wiphy->interface_modes & types) != types))
 430                                 return -EINVAL;
 431                 }
 432
 433                 /* You can't even choose that many! */
 434                 if (WARN_ON(cnt < c->max_interfaces))
 435                         return -EINVAL;
 436         }
 437
 438         return 0;
 439 }
 440
 441 int wiphy_register(struct wiphy *wiphy)
 442 {
 443         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 444         int res;
 445         enum ieee80211_band band;
 446         struct ieee80211_supported_band *sband;
 447         bool have_band = false;
 448         int i;
 449         u16 ifmodes = wiphy->interface_modes;
 450
 451 #ifdef CONFIG_PM
 452         if (WARN_ON(wiphy->wowlan &&
 453                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 454                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 455                 return -EINVAL;
 456         if (WARN_ON(wiphy->wowlan &&
 457                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 458                     !wiphy->wowlan->tcp))
 459                 return -EINVAL;
 460 #endif
 461
 462         if (WARN_ON(wiphy->ap_sme_capa &&
 463                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 464                 return -EINVAL;
 465
 466         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 467                 return -EINVAL;
 468
 469         if (WARN_ON(wiphy->addresses &&
 470                     !is_zero_ether_addr(wiphy->perm_addr) &&
 471                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 472                            ETH_ALEN)))
 473                 return -EINVAL;
 474
 475         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 476                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 477                      !rdev->ops->set_mac_acl)))
 478                 return -EINVAL;
 479
 480         if (wiphy->addresses)
 481                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 482
 483         /* sanity check ifmodes */
 484         WARN_ON(!ifmodes);
 485         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 486         if (WARN_ON(ifmodes != wiphy->interface_modes))
 487                 wiphy->interface_modes = ifmodes;
 488
 489         res = wiphy_verify_combinations(wiphy);
 490         if (res)
 491                 return res;
 492
 493         /* sanity check supported bands/channels */
 494         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 495                 sband = wiphy->bands[band];
 496                 if (!sband)
 497                         continue;
 498
 499                 sband->band = band;
 500                 if (WARN_ON(!sband->n_channels))
 501                         return -EINVAL;
 502                 /*
 503                  * on 60gHz band, there are no legacy rates, so
 504                  * n_bitrates is 0
 505                  */
 506                 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
 507                             !sband->n_bitrates))
 508                         return -EINVAL;
 509
 510                 /*
 511                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 512                  * modify the sband's ht data even if the driver uses a
 513                  * global structure for that.
 514                  */
 515                 if (cfg80211_disable_40mhz_24ghz &&
 516                     band == IEEE80211_BAND_2GHZ &&
 517                     sband->ht_cap.ht_supported) {
 518                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 519                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 520                 }
 521
 522                 /*
 523                  * Since we use a u32 for rate bitmaps in
 524                  * ieee80211_get_response_rate, we cannot
 525                  * have more than 32 legacy rates.
 526                  */
 527                 if (WARN_ON(sband->n_bitrates > 32))
 528                         return -EINVAL;
 529
 530                 for (i = 0; i < sband->n_channels; i++) {
 531                         sband->channels[i].orig_flags =
 532                                 sband->channels[i].flags;
 533                         sband->channels[i].orig_mag = INT_MAX;
 534                         sband->channels[i].orig_mpwr =
 535                                 sband->channels[i].max_power;
 536                         sband->channels[i].band = band;
 537                 }
 538
 539                 have_band = true;
 540         }
 541
 542         if (!have_band) {
 543                 WARN_ON(1);
 544                 return -EINVAL;
 545         }
 546
 547 #ifdef CONFIG_PM
 548         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 549                     (!rdev->wiphy.wowlan->pattern_min_len ||
 550                      rdev->wiphy.wowlan->pattern_min_len >
 551                                 rdev->wiphy.wowlan->pattern_max_len)))
 552                 return -EINVAL;
 553 #endif
 554
 555         /* check and set up bitrates */
 556         ieee80211_set_bitrate_flags(wiphy);
 557
 558         rtnl_lock();
 559
 560         res = device_add(&rdev->wiphy.dev);
 561         if (res) {
 562                 rtnl_unlock();
 563                 return res;
 564         }
 565
 566         /* set up regulatory info */
 567         wiphy_regulatory_register(wiphy);
 568
 569         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 570         cfg80211_rdev_list_generation++;
 571
 572         /* add to debugfs */
 573         rdev->wiphy.debugfsdir =
 574                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 575                                    ieee80211_debugfs_dir);
 576         if (IS_ERR(rdev->wiphy.debugfsdir))
 577                 rdev->wiphy.debugfsdir = NULL;
 578
 579         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
 580                 struct regulatory_request request;
 581
 582                 request.wiphy_idx = get_wiphy_idx(wiphy);
 583                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 584                 request.alpha2[0] = '9';
 585                 request.alpha2[1] = '9';
 586
 587                 nl80211_send_reg_change_event(&request);
 588         }
 589
 590         cfg80211_debugfs_rdev_add(rdev);
 591
 592         res = rfkill_register(rdev->rfkill);
 593         if (res) {
 594                 device_del(&rdev->wiphy.dev);
 595
 596                 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 597                 list_del_rcu(&rdev->list);
 598                 wiphy_regulatory_deregister(wiphy);
 599                 rtnl_unlock();
 600                 return res;
 601         }
 602
 603         rdev->wiphy.registered = true;
 604         rtnl_unlock();
 605         return 0;
 606 }
 607 EXPORT_SYMBOL(wiphy_register);
 608
 609 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 610 {
 611         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 612
 613         if (!rdev->ops->rfkill_poll)
 614                 return;
 615         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 616         rfkill_resume_polling(rdev->rfkill);
 617 }
 618 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 619
 620 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 621 {
 622         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 623
 624         rfkill_pause_polling(rdev->rfkill);
 625 }
 626 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 627
 628 void wiphy_unregister(struct wiphy *wiphy)
 629 {
 630         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 631
 632         wait_event(rdev->dev_wait, ({
 633                 int __count;
 634                 rtnl_lock();
 635                 __count = rdev->opencount;
 636                 rtnl_unlock();
 637                 __count == 0; }));
 638
 639         rtnl_lock();
 640         rdev->wiphy.registered = false;
 641
 642         rfkill_unregister(rdev->rfkill);
 643
 644         BUG_ON(!list_empty(&rdev->wdev_list));
 645
 646         /*
 647          * First remove the hardware from everywhere, this makes
 648          * it impossible to find from userspace.
 649          */
 650         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 651         list_del_rcu(&rdev->list);
 652         synchronize_rcu();
 653
 654         /*
 655          * If this device got a regulatory hint tell core its
 656          * free to listen now to a new shiny device regulatory hint
 657          */
 658         wiphy_regulatory_deregister(wiphy);
 659
 660         cfg80211_rdev_list_generation++;
 661         device_del(&rdev->wiphy.dev);
 662
 663         rtnl_unlock();
 664
 665         flush_work(&rdev->scan_done_wk);
 666         cancel_work_sync(&rdev->conn_work);
 667         flush_work(&rdev->event_work);
 668         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 669
 670 #ifdef CONFIG_PM
 671         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
 672                 rdev_set_wakeup(rdev, false);
 673 #endif
 674         cfg80211_rdev_free_wowlan(rdev);
 675 }
 676 EXPORT_SYMBOL(wiphy_unregister);
 677
 678 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 679 {
 680         struct cfg80211_internal_bss *scan, *tmp;
 681         struct cfg80211_beacon_registration *reg, *treg;
 682         rfkill_destroy(rdev->rfkill);
 683         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 684                 list_del(&reg->list);
 685                 kfree(reg);
 686         }
 687         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 688                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 689         kfree(rdev);
 690 }
 691
 692 void wiphy_free(struct wiphy *wiphy)
 693 {
 694         put_device(&wiphy->dev);
 695 }
 696 EXPORT_SYMBOL(wiphy_free);
 697
 698 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 699 {
 700         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 701
 702         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 703                 schedule_work(&rdev->rfkill_sync);
 704 }
 705 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 706
 707 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 708 {
 709         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 710
 711         ASSERT_RTNL();
 712
 713         if (WARN_ON(wdev->netdev))
 714                 return;
 715
 716         list_del_rcu(&wdev->list);
 717         rdev->devlist_generation++;
 718
 719         switch (wdev->iftype) {
 720         case NL80211_IFTYPE_P2P_DEVICE:
 721                 cfg80211_stop_p2p_device(rdev, wdev);
 722                 break;
 723         default:
 724                 WARN_ON_ONCE(1);
 725                 break;
 726         }
 727 }
 728 EXPORT_SYMBOL(cfg80211_unregister_wdev);
 729
 730 static struct device_type wiphy_type = {
 731         .name   = "wlan",
 732 };
 733
 734 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 735                                enum nl80211_iftype iftype, int num)
 736 {
 737         ASSERT_RTNL();
 738
 739         rdev->num_running_ifaces += num;
 740         if (iftype == NL80211_IFTYPE_MONITOR)
 741                 rdev->num_running_monitor_ifaces += num;
 742 }
 743
 744 void cfg80211_leave(struct cfg80211_registered_device *rdev,
 745                     struct wireless_dev *wdev)
 746 {
 747         struct net_device *dev = wdev->netdev;
 748
 749         switch (wdev->iftype) {
 750         case NL80211_IFTYPE_ADHOC:
 751                 cfg80211_leave_ibss(rdev, dev, true);
 752                 break;
 753         case NL80211_IFTYPE_P2P_CLIENT:
 754         case NL80211_IFTYPE_STATION:
 755                 __cfg80211_stop_sched_scan(rdev, false);
 756
 757                 wdev_lock(wdev);
 758 #ifdef CONFIG_CFG80211_WEXT
 759                 kfree(wdev->wext.ie);
 760                 wdev->wext.ie = NULL;
 761                 wdev->wext.ie_len = 0;
 762                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 763 #endif
 764                 cfg80211_disconnect(rdev, dev,
 765                                     WLAN_REASON_DEAUTH_LEAVING, true);
 766                 wdev_unlock(wdev);
 767                 break;
 768         case NL80211_IFTYPE_MESH_POINT:
 769                 cfg80211_leave_mesh(rdev, dev);
 770                 break;
 771         case NL80211_IFTYPE_AP:
 772                 cfg80211_stop_ap(rdev, dev);
 773                 break;
 774         default:
 775                 break;
 776         }
 777
 778         wdev->beacon_interval = 0;
 779 }
 780
 781 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 782                                          unsigned long state,
 783                                          void *ndev)
 784 {
 785         struct net_device *dev = ndev;
 786         struct wireless_dev *wdev = dev->ieee80211_ptr;
 787         struct cfg80211_registered_device *rdev;
 788         int ret;
 789
 790         if (!wdev)
 791                 return NOTIFY_DONE;
 792
 793         rdev = wiphy_to_dev(wdev->wiphy);
 794
 795         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 796
 797         switch (state) {
 798         case NETDEV_POST_INIT:
 799                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 800                 break;
 801         case NETDEV_REGISTER:
 802                 /*
 803                  * NB: cannot take rdev->mtx here because this may be
 804                  * called within code protected by it when interfaces
 805                  * are added with nl80211.
 806                  */
 807                 mutex_init(&wdev->mtx);
 808                 INIT_LIST_HEAD(&wdev->event_list);
 809                 spin_lock_init(&wdev->event_lock);
 810                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
 811                 spin_lock_init(&wdev->mgmt_registrations_lock);
 812
 813                 wdev->identifier = ++rdev->wdev_id;
 814                 list_add_rcu(&wdev->list, &rdev->wdev_list);
 815                 rdev->devlist_generation++;
 816                 /* can only change netns with wiphy */
 817                 dev->features |= NETIF_F_NETNS_LOCAL;
 818
 819                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 820                                       "phy80211")) {
 821                         pr_err("failed to add phy80211 symlink to netdev!\n");
 822                 }
 823                 wdev->netdev = dev;
 824                 wdev->sme_state = CFG80211_SME_IDLE;
 825 #ifdef CONFIG_CFG80211_WEXT
 826                 wdev->wext.default_key = -1;
 827                 wdev->wext.default_mgmt_key = -1;
 828                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 829 #endif
 830
 831                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
 832                         wdev->ps = true;
 833                 else
 834                         wdev->ps = false;
 835                 /* allow mac80211 to determine the timeout */
 836                 wdev->ps_timeout = -1;
 837
 838                 netdev_set_default_ethtool_ops(dev, &cfg80211_ethtool_ops);
 839
 840                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 841                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
 842                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
 843                         dev->priv_flags |= IFF_DONT_BRIDGE;
 844                 break;
 845         case NETDEV_GOING_DOWN:
 846                 cfg80211_leave(rdev, wdev);
 847                 break;
 848         case NETDEV_DOWN:
 849                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
 850                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 851                         if (WARN_ON(!rdev->scan_req->notified))
 852                                 rdev->scan_req->aborted = true;
 853                         ___cfg80211_scan_done(rdev, true);
 854                 }
 855
 856                 if (WARN_ON(rdev->sched_scan_req &&
 857                             rdev->sched_scan_req->dev == wdev->netdev)) {
 858                         __cfg80211_stop_sched_scan(rdev, false);
 859                 }
 860
 861                 rdev->opencount--;
 862                 wake_up(&rdev->dev_wait);
 863                 break;
 864         case NETDEV_UP:
 865                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
 866                 wdev_lock(wdev);
 867                 switch (wdev->iftype) {
 868 #ifdef CONFIG_CFG80211_WEXT
 869                 case NL80211_IFTYPE_ADHOC:
 870                         cfg80211_ibss_wext_join(rdev, wdev);
 871                         break;
 872                 case NL80211_IFTYPE_STATION:
 873                         cfg80211_mgd_wext_connect(rdev, wdev);
 874                         break;
 875 #endif
 876 #ifdef CONFIG_MAC80211_MESH
 877                 case NL80211_IFTYPE_MESH_POINT:
 878                         {
 879                                 /* backward compat code... */
 880                                 struct mesh_setup setup;
 881                                 memcpy(&setup, &default_mesh_setup,
 882                                                 sizeof(setup));
 883                                  /* back compat only needed for mesh_id */
 884                                 setup.mesh_id = wdev->ssid;
 885                                 setup.mesh_id_len = wdev->mesh_id_up_len;
 886                                 if (wdev->mesh_id_up_len)
 887                                         __cfg80211_join_mesh(rdev, dev,
 888                                                         &setup,
 889                                                         &default_mesh_config);
 890                                 break;
 891                         }
 892 #endif
 893                 default:
 894                         break;
 895                 }
 896                 wdev_unlock(wdev);
 897                 rdev->opencount++;
 898
 899                 /*
 900                  * Configure power management to the driver here so that its
 901                  * correctly set also after interface type changes etc.
 902                  */
 903                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 904                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
 905                     rdev->ops->set_power_mgmt)
 906                         if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
 907                                                 wdev->ps_timeout)) {
 908                                 /* assume this means it's off */
 909                                 wdev->ps = false;
 910                         }
 911                 break;
 912         case NETDEV_UNREGISTER:
 913                 /*
 914                  * It is possible to get NETDEV_UNREGISTER
 915                  * multiple times. To detect that, check
 916                  * that the interface is still on the list
 917                  * of registered interfaces, and only then
 918                  * remove and clean it up.
 919                  */
 920                 if (!list_empty(&wdev->list)) {
 921                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 922                         list_del_rcu(&wdev->list);
 923                         rdev->devlist_generation++;
 924                         cfg80211_mlme_purge_registrations(wdev);
 925 #ifdef CONFIG_CFG80211_WEXT
 926                         kfree(wdev->wext.keys);
 927 #endif
 928                 }
 929                 /*
 930                  * synchronise (so that we won't find this netdev
 931                  * from other code any more) and then clear the list
 932                  * head so that the above code can safely check for
 933                  * !list_empty() to avoid double-cleanup.
 934                  */
 935                 synchronize_rcu();
 936                 INIT_LIST_HEAD(&wdev->list);
 937                 /*
 938                  * Ensure that all events have been processed and
 939                  * freed.
 940                  */
 941                 cfg80211_process_wdev_events(wdev);
 942                 break;
 943         case NETDEV_PRE_UP:
 944                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 945                         return notifier_from_errno(-EOPNOTSUPP);
 946                 if (rfkill_blocked(rdev->rfkill))
 947                         return notifier_from_errno(-ERFKILL);
 948                 ret = cfg80211_can_add_interface(rdev, wdev->iftype);
 949                 if (ret)
 950                         return notifier_from_errno(ret);
 951                 break;
 952         }
 953
 954         return NOTIFY_DONE;
 955 }
 956
 957 static struct notifier_block cfg80211_netdev_notifier = {
 958         .notifier_call = cfg80211_netdev_notifier_call,
 959 };
 960
 961 static void __net_exit cfg80211_pernet_exit(struct net *net)
 962 {
 963         struct cfg80211_registered_device *rdev;
 964
 965         rtnl_lock();
 966         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 967                 if (net_eq(wiphy_net(&rdev->wiphy), net))
 968                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
 969         }
 970         rtnl_unlock();
 971 }
 972
 973 static struct pernet_operations cfg80211_pernet_ops = {
 974         .exit = cfg80211_pernet_exit,
 975 };
 976
 977 static int __init cfg80211_init(void)
 978 {
 979         int err;
 980
 981         err = register_pernet_device(&cfg80211_pernet_ops);
 982         if (err)
 983                 goto out_fail_pernet;
 984
 985         err = wiphy_sysfs_init();
 986         if (err)
 987                 goto out_fail_sysfs;
 988
 989         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
 990         if (err)
 991                 goto out_fail_notifier;
 992
 993         err = nl80211_init();
 994         if (err)
 995                 goto out_fail_nl80211;
 996
 997         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
 998
 999         err = regulatory_init();
1000         if (err)
1001                 goto out_fail_reg;
1002
1003         cfg80211_wq = create_singlethread_workqueue("cfg80211");
1004         if (!cfg80211_wq) {
1005                 err = -ENOMEM;
1006                 goto out_fail_wq;
1007         }
1008
1009         return 0;
1010
1011 out_fail_wq:
1012         regulatory_exit();
1013 out_fail_reg:
1014         debugfs_remove(ieee80211_debugfs_dir);
1015 out_fail_nl80211:
1016         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1017 out_fail_notifier:
1018         wiphy_sysfs_exit();
1019 out_fail_sysfs:
1020         unregister_pernet_device(&cfg80211_pernet_ops);
1021 out_fail_pernet:
1022         return err;
1023 }
1024 subsys_initcall(cfg80211_init);
1025
1026 static void __exit cfg80211_exit(void)
1027 {
1028         debugfs_remove(ieee80211_debugfs_dir);
1029         nl80211_exit();
1030         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1031         wiphy_sysfs_exit();
1032         regulatory_exit();
1033         unregister_pernet_device(&cfg80211_pernet_ops);
1034         destroy_workqueue(cfg80211_wq);
1035 }
1036 module_exit(cfg80211_exit);