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         /* prohibit calling the thing phy%d when %d is not its number */
  99         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 100         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 101                 /* count number of places needed to print wiphy_idx */
 102                 digits = 1;
 103                 while (wiphy_idx /= 10)
 104                         digits++;
 105                 /*
 106                  * deny the name if it is phy<idx> where <idx> is printed
 107                  * without leading zeroes. taken == strlen(newname) here
 108                  */
 109                 if (taken == strlen(PHY_NAME) + digits)
 110                         return -EINVAL;
 111         }
 112
 113         /* Ensure another device does not already have this name. */
 114         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 115                 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
 116                         return -EINVAL;
 117
 118         return 0;
 119 }
 120
 121 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 122                         char *newname)
 123 {
 124         int result;
 125
 126         ASSERT_RTNL();
 127
 128         /* Ignore nop renames */
 129         if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
 130                 return 0;
 131
 132         result = cfg80211_dev_check_name(rdev, newname);
 133         if (result < 0)
 134                 return result;
 135
 136         result = device_rename(&rdev->wiphy.dev, newname);
 137         if (result)
 138                 return result;
 139
 140         if (rdev->wiphy.debugfsdir &&
 141             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 142                             rdev->wiphy.debugfsdir,
 143                             rdev->wiphy.debugfsdir->d_parent,
 144                             newname))
 145                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 146
 147         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 148
 149         return 0;
 150 }
 151
 152 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 153                           struct net *net)
 154 {
 155         struct wireless_dev *wdev;
 156         int err = 0;
 157
 158         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 159                 return -EOPNOTSUPP;
 160
 161         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 162                 if (!wdev->netdev)
 163                         continue;
 164                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 165                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 166                 if (err)
 167                         break;
 168                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 169         }
 170
 171         if (err) {
 172                 /* failed -- clean up to old netns */
 173                 net = wiphy_net(&rdev->wiphy);
 174
 175                 list_for_each_entry_continue_reverse(wdev,
 176                                                      &rdev->wiphy.wdev_list,
 177                                                      list) {
 178                         if (!wdev->netdev)
 179                                 continue;
 180                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 181                         err = dev_change_net_namespace(wdev->netdev, net,
 182                                                         "wlan%d");
 183                         WARN_ON(err);
 184                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 185                 }
 186
 187                 return err;
 188         }
 189
 190         wiphy_net_set(&rdev->wiphy, net);
 191
 192         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 193         WARN_ON(err);
 194
 195         return 0;
 196 }
 197
 198 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 199 {
 200         struct cfg80211_registered_device *rdev = data;
 201
 202         rdev_rfkill_poll(rdev);
 203 }
 204
 205 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 206                               struct wireless_dev *wdev)
 207 {
 208         ASSERT_RTNL();
 209
 210         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 211                 return;
 212
 213         if (!wdev_running(wdev))
 214                 return;
 215
 216         rdev_stop_p2p_device(rdev, wdev);
 217         wdev->is_running = false;
 218
 219         rdev->opencount--;
 220
 221         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 222                 if (WARN_ON(!rdev->scan_req->notified))
 223                         rdev->scan_req->info.aborted = true;
 224                 ___cfg80211_scan_done(rdev, false);
 225         }
 226 }
 227
 228 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
 229                        struct wireless_dev *wdev)
 230 {
 231         ASSERT_RTNL();
 232
 233         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
 234                 return;
 235
 236         if (!wdev_running(wdev))
 237                 return;
 238
 239         rdev_stop_nan(rdev, wdev);
 240         wdev->is_running = false;
 241
 242         rdev->opencount--;
 243 }
 244
 245 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 246 {
 247         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 248         struct wireless_dev *wdev;
 249
 250         ASSERT_RTNL();
 251
 252         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 253                 if (wdev->netdev) {
 254                         dev_close(wdev->netdev);
 255                         continue;
 256                 }
 257                 /* otherwise, check iftype */
 258                 switch (wdev->iftype) {
 259                 case NL80211_IFTYPE_P2P_DEVICE:
 260                         cfg80211_stop_p2p_device(rdev, wdev);
 261                         break;
 262                 case NL80211_IFTYPE_NAN:
 263                         cfg80211_stop_nan(rdev, wdev);
 264                         break;
 265                 default:
 266                         break;
 267                 }
 268         }
 269 }
 270 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 271
 272 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 273 {
 274         struct cfg80211_registered_device *rdev = data;
 275
 276         if (!blocked)
 277                 return 0;
 278
 279         rtnl_lock();
 280         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 281         rtnl_unlock();
 282
 283         return 0;
 284 }
 285
 286 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 287 {
 288         struct cfg80211_registered_device *rdev;
 289
 290         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 291         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 292 }
 293
 294 static void cfg80211_event_work(struct work_struct *work)
 295 {
 296         struct cfg80211_registered_device *rdev;
 297
 298         rdev = container_of(work, struct cfg80211_registered_device,
 299                             event_work);
 300
 301         rtnl_lock();
 302         cfg80211_process_rdev_events(rdev);
 303         rtnl_unlock();
 304 }
 305
 306 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 307 {
 308         struct wireless_dev *wdev, *tmp;
 309
 310         ASSERT_RTNL();
 311
 312         list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
 313                 if (wdev->nl_owner_dead)
 314                         rdev_del_virtual_intf(rdev, wdev);
 315         }
 316 }
 317
 318 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 319 {
 320         struct cfg80211_registered_device *rdev;
 321
 322         rdev = container_of(work, struct cfg80211_registered_device,
 323                             destroy_work);
 324
 325         rtnl_lock();
 326         cfg80211_destroy_ifaces(rdev);
 327         rtnl_unlock();
 328 }
 329
 330 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
 331 {
 332         struct cfg80211_registered_device *rdev;
 333         struct cfg80211_sched_scan_request *req, *tmp;
 334
 335         rdev = container_of(work, struct cfg80211_registered_device,
 336                            sched_scan_stop_wk);
 337
 338         rtnl_lock();
 339         list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
 340                 if (req->nl_owner_dead)
 341                         cfg80211_stop_sched_scan_req(rdev, req, false);
 342         }
 343         rtnl_unlock();
 344 }
 345
 346 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
 347 {
 348         struct cfg80211_registered_device *rdev;
 349
 350         rdev = container_of(work, struct cfg80211_registered_device,
 351                             propagate_radar_detect_wk);
 352
 353         rtnl_lock();
 354
 355         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
 356                                        NL80211_DFS_UNAVAILABLE,
 357                                        NL80211_RADAR_DETECTED);
 358
 359         rtnl_unlock();
 360 }
 361
 362 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
 363 {
 364         struct cfg80211_registered_device *rdev;
 365
 366         rdev = container_of(work, struct cfg80211_registered_device,
 367                             propagate_cac_done_wk);
 368
 369         rtnl_lock();
 370
 371         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
 372                                        NL80211_DFS_AVAILABLE,
 373                                        NL80211_RADAR_CAC_FINISHED);
 374
 375         rtnl_unlock();
 376 }
 377
 378 /* exported functions */
 379
 380 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 381                            const char *requested_name)
 382 {
 383         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 384
 385         struct cfg80211_registered_device *rdev;
 386         int alloc_size;
 387
 388         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 389         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 390         WARN_ON(ops->connect && !ops->disconnect);
 391         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 392         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 393         WARN_ON(ops->add_station && !ops->del_station);
 394         WARN_ON(ops->add_mpath && !ops->del_mpath);
 395         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 396         WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
 397         WARN_ON(ops->start_ap && !ops->stop_ap);
 398         WARN_ON(ops->join_ocb && !ops->leave_ocb);
 399         WARN_ON(ops->suspend && !ops->resume);
 400         WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
 401         WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
 402         WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
 403         WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
 404
 405         alloc_size = sizeof(*rdev) + sizeof_priv;
 406
 407         rdev = kzalloc(alloc_size, GFP_KERNEL);
 408         if (!rdev)
 409                 return NULL;
 410
 411         rdev->ops = ops;
 412
 413         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 414
 415         if (unlikely(rdev->wiphy_idx < 0)) {
 416                 /* ugh, wrapped! */
 417                 atomic_dec(&wiphy_counter);
 418                 kfree(rdev);
 419                 return NULL;
 420         }
 421
 422         /* atomic_inc_return makes it start at 1, make it start at 0 */
 423         rdev->wiphy_idx--;
 424
 425         /* give it a proper name */
 426         if (requested_name && requested_name[0]) {
 427                 int rv;
 428
 429                 rtnl_lock();
 430                 rv = cfg80211_dev_check_name(rdev, requested_name);
 431
 432                 if (rv < 0) {
 433                         rtnl_unlock();
 434                         goto use_default_name;
 435                 }
 436
 437                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 438                 rtnl_unlock();
 439                 if (rv)
 440                         goto use_default_name;
 441         } else {
 442 use_default_name:
 443                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 444                  * the restrictions on phy names.  Probably this call could
 445                  * fail if some other part of the kernel (re)named a device
 446                  * phyX.  But, might should add some locking and check return
 447                  * value, and use a different name if this one exists?
 448                  */
 449                 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 450         }
 451
 452         INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
 453         INIT_LIST_HEAD(&rdev->beacon_registrations);
 454         spin_lock_init(&rdev->beacon_registrations_lock);
 455         spin_lock_init(&rdev->bss_lock);
 456         INIT_LIST_HEAD(&rdev->bss_list);
 457         INIT_LIST_HEAD(&rdev->sched_scan_req_list);
 458         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 459         INIT_LIST_HEAD(&rdev->mlme_unreg);
 460         spin_lock_init(&rdev->mlme_unreg_lock);
 461         INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
 462         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 463                           cfg80211_dfs_channels_update_work);
 464 #ifdef CONFIG_CFG80211_WEXT
 465         rdev->wiphy.wext = &cfg80211_wext_handler;
 466 #endif
 467
 468         device_initialize(&rdev->wiphy.dev);
 469         rdev->wiphy.dev.class = &ieee80211_class;
 470         rdev->wiphy.dev.platform_data = rdev;
 471         device_enable_async_suspend(&rdev->wiphy.dev);
 472
 473         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 474         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 475         INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
 476         INIT_WORK(&rdev->propagate_radar_detect_wk,
 477                   cfg80211_propagate_radar_detect_wk);
 478         INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
 479
 480 #ifdef CONFIG_CFG80211_DEFAULT_PS
 481         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 482 #endif
 483
 484         wiphy_net_set(&rdev->wiphy, &init_net);
 485
 486         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 487         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 488                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 489                                    &rdev->rfkill_ops, rdev);
 490
 491         if (!rdev->rfkill) {
 492                 kfree(rdev);
 493                 return NULL;
 494         }
 495
 496         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 497         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 498         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 499
 500         init_waitqueue_head(&rdev->dev_wait);
 501
 502         /*
 503          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 504          * Fragmentation and RTS threshold are disabled by default with the
 505          * special -1 value.
 506          */
 507         rdev->wiphy.retry_short = 7;
 508         rdev->wiphy.retry_long = 4;
 509         rdev->wiphy.frag_threshold = (u32) -1;
 510         rdev->wiphy.rts_threshold = (u32) -1;
 511         rdev->wiphy.coverage_class = 0;
 512
 513         rdev->wiphy.max_num_csa_counters = 1;
 514
 515         rdev->wiphy.max_sched_scan_plans = 1;
 516         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 517
 518         return &rdev->wiphy;
 519 }
 520 EXPORT_SYMBOL(wiphy_new_nm);
 521
 522 static int wiphy_verify_combinations(struct wiphy *wiphy)
 523 {
 524         const struct ieee80211_iface_combination *c;
 525         int i, j;
 526
 527         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 528                 u32 cnt = 0;
 529                 u16 all_iftypes = 0;
 530
 531                 c = &wiphy->iface_combinations[i];
 532
 533                 /*
 534                  * Combinations with just one interface aren't real,
 535                  * however we make an exception for DFS.
 536                  */
 537                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 538                         return -EINVAL;
 539
 540                 /* Need at least one channel */
 541                 if (WARN_ON(!c->num_different_channels))
 542                         return -EINVAL;
 543
 544                 /*
 545                  * Put a sane limit on maximum number of different
 546                  * channels to simplify channel accounting code.
 547                  */
 548                 if (WARN_ON(c->num_different_channels >
 549                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 550                         return -EINVAL;
 551
 552                 /* DFS only works on one channel. */
 553                 if (WARN_ON(c->radar_detect_widths &&
 554                             (c->num_different_channels > 1)))
 555                         return -EINVAL;
 556
 557                 if (WARN_ON(!c->n_limits))
 558                         return -EINVAL;
 559
 560                 for (j = 0; j < c->n_limits; j++) {
 561                         u16 types = c->limits[j].types;
 562
 563                         /* interface types shouldn't overlap */
 564                         if (WARN_ON(types & all_iftypes))
 565                                 return -EINVAL;
 566                         all_iftypes |= types;
 567
 568                         if (WARN_ON(!c->limits[j].max))
 569                                 return -EINVAL;
 570
 571                         /* Shouldn't list software iftypes in combinations! */
 572                         if (WARN_ON(wiphy->software_iftypes & types))
 573                                 return -EINVAL;
 574
 575                         /* Only a single P2P_DEVICE can be allowed */
 576                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 577                                     c->limits[j].max > 1))
 578                                 return -EINVAL;
 579
 580                         /* Only a single NAN can be allowed */
 581                         if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
 582                                     c->limits[j].max > 1))
 583                                 return -EINVAL;
 584
 585                         /*
 586                          * This isn't well-defined right now. If you have an
 587                          * IBSS interface, then its beacon interval may change
 588                          * by joining other networks, and nothing prevents it
 589                          * from doing that.
 590                          * So technically we probably shouldn't even allow AP
 591                          * and IBSS in the same interface, but it seems that
 592                          * some drivers support that, possibly only with fixed
 593                          * beacon intervals for IBSS.
 594                          */
 595                         if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
 596                                     c->beacon_int_min_gcd)) {
 597                                 return -EINVAL;
 598                         }
 599
 600                         cnt += c->limits[j].max;
 601                         /*
 602                          * Don't advertise an unsupported type
 603                          * in a combination.
 604                          */
 605                         if (WARN_ON((wiphy->interface_modes & types) != types))
 606                                 return -EINVAL;
 607                 }
 608
 609 #ifndef CONFIG_WIRELESS_WDS
 610                 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
 611                         return -EINVAL;
 612 #endif
 613
 614                 /* You can't even choose that many! */
 615                 if (WARN_ON(cnt < c->max_interfaces))
 616                         return -EINVAL;
 617         }
 618
 619         return 0;
 620 }
 621
 622 int wiphy_register(struct wiphy *wiphy)
 623 {
 624         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 625         int res;
 626         enum nl80211_band band;
 627         struct ieee80211_supported_band *sband;
 628         bool have_band = false;
 629         int i;
 630         u16 ifmodes = wiphy->interface_modes;
 631
 632 #ifdef CONFIG_PM
 633         if (WARN_ON(wiphy->wowlan &&
 634                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 635                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 636                 return -EINVAL;
 637         if (WARN_ON(wiphy->wowlan &&
 638                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 639                     !wiphy->wowlan->tcp))
 640                 return -EINVAL;
 641 #endif
 642         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 643                     (!rdev->ops->tdls_channel_switch ||
 644                      !rdev->ops->tdls_cancel_channel_switch)))
 645                 return -EINVAL;
 646
 647         if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
 648                     (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
 649                      !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
 650                      !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
 651                 return -EINVAL;
 652
 653 #ifndef CONFIG_WIRELESS_WDS
 654         if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
 655                 return -EINVAL;
 656 #endif
 657
 658         /*
 659          * if a wiphy has unsupported modes for regulatory channel enforcement,
 660          * opt-out of enforcement checking
 661          */
 662         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 663                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 664                                        BIT(NL80211_IFTYPE_AP) |
 665                                        BIT(NL80211_IFTYPE_P2P_GO) |
 666                                        BIT(NL80211_IFTYPE_ADHOC) |
 667                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 668                                        BIT(NL80211_IFTYPE_NAN) |
 669                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 670                                        BIT(NL80211_IFTYPE_MONITOR)))
 671                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 672
 673         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 674                     (wiphy->regulatory_flags &
 675                                         (REGULATORY_CUSTOM_REG |
 676                                          REGULATORY_STRICT_REG |
 677                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 678                                          REGULATORY_COUNTRY_IE_IGNORE))))
 679                 return -EINVAL;
 680
 681         if (WARN_ON(wiphy->coalesce &&
 682                     (!wiphy->coalesce->n_rules ||
 683                      !wiphy->coalesce->n_patterns) &&
 684                     (!wiphy->coalesce->pattern_min_len ||
 685                      wiphy->coalesce->pattern_min_len >
 686                         wiphy->coalesce->pattern_max_len)))
 687                 return -EINVAL;
 688
 689         if (WARN_ON(wiphy->ap_sme_capa &&
 690                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 691                 return -EINVAL;
 692
 693         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 694                 return -EINVAL;
 695
 696         if (WARN_ON(wiphy->addresses &&
 697                     !is_zero_ether_addr(wiphy->perm_addr) &&
 698                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 699                            ETH_ALEN)))
 700                 return -EINVAL;
 701
 702         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 703                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 704                      !rdev->ops->set_mac_acl)))
 705                 return -EINVAL;
 706
 707         /* assure only valid behaviours are flagged by driver
 708          * hence subtract 2 as bit 0 is invalid.
 709          */
 710         if (WARN_ON(wiphy->bss_select_support &&
 711                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 712                 return -EINVAL;
 713
 714         if (wiphy->addresses)
 715                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 716
 717         /* sanity check ifmodes */
 718         WARN_ON(!ifmodes);
 719         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 720         if (WARN_ON(ifmodes != wiphy->interface_modes))
 721                 wiphy->interface_modes = ifmodes;
 722
 723         res = wiphy_verify_combinations(wiphy);
 724         if (res)
 725                 return res;
 726
 727         /* sanity check supported bands/channels */
 728         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 729                 sband = wiphy->bands[band];
 730                 if (!sband)
 731                         continue;
 732
 733                 sband->band = band;
 734                 if (WARN_ON(!sband->n_channels))
 735                         return -EINVAL;
 736                 /*
 737                  * on 60GHz band, there are no legacy rates, so
 738                  * n_bitrates is 0
 739                  */
 740                 if (WARN_ON(band != NL80211_BAND_60GHZ &&
 741                             !sband->n_bitrates))
 742                         return -EINVAL;
 743
 744                 /*
 745                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 746                  * modify the sband's ht data even if the driver uses a
 747                  * global structure for that.
 748                  */
 749                 if (cfg80211_disable_40mhz_24ghz &&
 750                     band == NL80211_BAND_2GHZ &&
 751                     sband->ht_cap.ht_supported) {
 752                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 753                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 754                 }
 755
 756                 /*
 757                  * Since we use a u32 for rate bitmaps in
 758                  * ieee80211_get_response_rate, we cannot
 759                  * have more than 32 legacy rates.
 760                  */
 761                 if (WARN_ON(sband->n_bitrates > 32))
 762                         return -EINVAL;
 763
 764                 for (i = 0; i < sband->n_channels; i++) {
 765                         sband->channels[i].orig_flags =
 766                                 sband->channels[i].flags;
 767                         sband->channels[i].orig_mag = INT_MAX;
 768                         sband->channels[i].orig_mpwr =
 769                                 sband->channels[i].max_power;
 770                         sband->channels[i].band = band;
 771                 }
 772
 773                 have_band = true;
 774         }
 775
 776         if (!have_band) {
 777                 WARN_ON(1);
 778                 return -EINVAL;
 779         }
 780
 781 #ifdef CONFIG_PM
 782         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 783                     (!rdev->wiphy.wowlan->pattern_min_len ||
 784                      rdev->wiphy.wowlan->pattern_min_len >
 785                                 rdev->wiphy.wowlan->pattern_max_len)))
 786                 return -EINVAL;
 787 #endif
 788
 789         /* check and set up bitrates */
 790         ieee80211_set_bitrate_flags(wiphy);
 791
 792         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 793
 794         rtnl_lock();
 795         res = device_add(&rdev->wiphy.dev);
 796         if (res) {
 797                 rtnl_unlock();
 798                 return res;
 799         }
 800
 801         /* set up regulatory info */
 802         wiphy_regulatory_register(wiphy);
 803
 804         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 805         cfg80211_rdev_list_generation++;
 806
 807         /* add to debugfs */
 808         rdev->wiphy.debugfsdir =
 809                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 810                                    ieee80211_debugfs_dir);
 811         if (IS_ERR(rdev->wiphy.debugfsdir))
 812                 rdev->wiphy.debugfsdir = NULL;
 813
 814         cfg80211_debugfs_rdev_add(rdev);
 815         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 816
 817         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 818                 struct regulatory_request request;
 819
 820                 request.wiphy_idx = get_wiphy_idx(wiphy);
 821                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 822                 request.alpha2[0] = '9';
 823                 request.alpha2[1] = '9';
 824
 825                 nl80211_send_reg_change_event(&request);
 826         }
 827
 828         /* Check that nobody globally advertises any capabilities they do not
 829          * advertise on all possible interface types.
 830          */
 831         if (wiphy->extended_capabilities_len &&
 832             wiphy->num_iftype_ext_capab &&
 833             wiphy->iftype_ext_capab) {
 834                 u8 supported_on_all, j;
 835                 const struct wiphy_iftype_ext_capab *capab;
 836
 837                 capab = wiphy->iftype_ext_capab;
 838                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
 839                         if (capab[0].extended_capabilities_len > j)
 840                                 supported_on_all =
 841                                         capab[0].extended_capabilities[j];
 842                         else
 843                                 supported_on_all = 0x00;
 844                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
 845                                 if (j >= capab[i].extended_capabilities_len) {
 846                                         supported_on_all = 0x00;
 847                                         break;
 848                                 }
 849                                 supported_on_all &=
 850                                         capab[i].extended_capabilities[j];
 851                         }
 852                         if (WARN_ON(wiphy->extended_capabilities[j] &
 853                                     ~supported_on_all))
 854                                 break;
 855                 }
 856         }
 857
 858         rdev->wiphy.registered = true;
 859         rtnl_unlock();
 860
 861         res = rfkill_register(rdev->rfkill);
 862         if (res) {
 863                 rfkill_destroy(rdev->rfkill);
 864                 rdev->rfkill = NULL;
 865                 wiphy_unregister(&rdev->wiphy);
 866                 return res;
 867         }
 868
 869         return 0;
 870 }
 871 EXPORT_SYMBOL(wiphy_register);
 872
 873 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 874 {
 875         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 876
 877         if (!rdev->ops->rfkill_poll)
 878                 return;
 879         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 880         rfkill_resume_polling(rdev->rfkill);
 881 }
 882 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 883
 884 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 885 {
 886         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 887
 888         rfkill_pause_polling(rdev->rfkill);
 889 }
 890 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 891
 892 void wiphy_unregister(struct wiphy *wiphy)
 893 {
 894         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 895
 896         wait_event(rdev->dev_wait, ({
 897                 int __count;
 898                 rtnl_lock();
 899                 __count = rdev->opencount;
 900                 rtnl_unlock();
 901                 __count == 0; }));
 902
 903         if (rdev->rfkill)
 904                 rfkill_unregister(rdev->rfkill);
 905
 906         rtnl_lock();
 907         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 908         rdev->wiphy.registered = false;
 909
 910         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
 911
 912         /*
 913          * First remove the hardware from everywhere, this makes
 914          * it impossible to find from userspace.
 915          */
 916         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 917         list_del_rcu(&rdev->list);
 918         synchronize_rcu();
 919
 920         /*
 921          * If this device got a regulatory hint tell core its
 922          * free to listen now to a new shiny device regulatory hint
 923          */
 924         wiphy_regulatory_deregister(wiphy);
 925
 926         cfg80211_rdev_list_generation++;
 927         device_del(&rdev->wiphy.dev);
 928
 929         rtnl_unlock();
 930
 931         flush_work(&rdev->scan_done_wk);
 932         cancel_work_sync(&rdev->conn_work);
 933         flush_work(&rdev->event_work);
 934         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 935         flush_work(&rdev->destroy_work);
 936         flush_work(&rdev->sched_scan_stop_wk);
 937         flush_work(&rdev->mlme_unreg_wk);
 938         flush_work(&rdev->propagate_radar_detect_wk);
 939         flush_work(&rdev->propagate_cac_done_wk);
 940
 941 #ifdef CONFIG_PM
 942         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
 943                 rdev_set_wakeup(rdev, false);
 944 #endif
 945         cfg80211_rdev_free_wowlan(rdev);
 946         cfg80211_rdev_free_coalesce(rdev);
 947 }
 948 EXPORT_SYMBOL(wiphy_unregister);
 949
 950 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 951 {
 952         struct cfg80211_internal_bss *scan, *tmp;
 953         struct cfg80211_beacon_registration *reg, *treg;
 954         rfkill_destroy(rdev->rfkill);
 955         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 956                 list_del(&reg->list);
 957                 kfree(reg);
 958         }
 959         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 960                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 961         kfree(rdev);
 962 }
 963
 964 void wiphy_free(struct wiphy *wiphy)
 965 {
 966         put_device(&wiphy->dev);
 967 }
 968 EXPORT_SYMBOL(wiphy_free);
 969
 970 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 971 {
 972         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 973
 974         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 975                 schedule_work(&rdev->rfkill_sync);
 976 }
 977 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 978
 979 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
 980 {
 981         kfree(wdev->cqm_config);
 982         wdev->cqm_config = NULL;
 983 }
 984
 985 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 986 {
 987         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 988
 989         ASSERT_RTNL();
 990
 991         if (WARN_ON(wdev->netdev))
 992                 return;
 993
 994         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
 995
 996         list_del_rcu(&wdev->list);
 997         rdev->devlist_generation++;
 998
 999         switch (wdev->iftype) {
1000         case NL80211_IFTYPE_P2P_DEVICE:
1001                 cfg80211_mlme_purge_registrations(wdev);
1002                 cfg80211_stop_p2p_device(rdev, wdev);
1003                 break;
1004         case NL80211_IFTYPE_NAN:
1005                 cfg80211_stop_nan(rdev, wdev);
1006                 break;
1007         default:
1008                 WARN_ON_ONCE(1);
1009                 break;
1010         }
1011
1012         cfg80211_cqm_config_free(wdev);
1013 }
1014 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1015
1016 static const struct device_type wiphy_type = {
1017         .name   = "wlan",
1018 };
1019
1020 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1021                                enum nl80211_iftype iftype, int num)
1022 {
1023         ASSERT_RTNL();
1024
1025         rdev->num_running_ifaces += num;
1026         if (iftype == NL80211_IFTYPE_MONITOR)
1027                 rdev->num_running_monitor_ifaces += num;
1028 }
1029
1030 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1031                       struct wireless_dev *wdev)
1032 {
1033         struct net_device *dev = wdev->netdev;
1034         struct cfg80211_sched_scan_request *pos, *tmp;
1035
1036         ASSERT_RTNL();
1037         ASSERT_WDEV_LOCK(wdev);
1038
1039         switch (wdev->iftype) {
1040         case NL80211_IFTYPE_ADHOC:
1041                 __cfg80211_leave_ibss(rdev, dev, true);
1042                 break;
1043         case NL80211_IFTYPE_P2P_CLIENT:
1044         case NL80211_IFTYPE_STATION:
1045                 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1046                                          list) {
1047                         if (dev == pos->dev)
1048                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1049                 }
1050
1051 #ifdef CONFIG_CFG80211_WEXT
1052                 kfree(wdev->wext.ie);
1053                 wdev->wext.ie = NULL;
1054                 wdev->wext.ie_len = 0;
1055                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1056 #endif
1057                 cfg80211_disconnect(rdev, dev,
1058                                     WLAN_REASON_DEAUTH_LEAVING, true);
1059                 break;
1060         case NL80211_IFTYPE_MESH_POINT:
1061                 __cfg80211_leave_mesh(rdev, dev);
1062                 break;
1063         case NL80211_IFTYPE_AP:
1064         case NL80211_IFTYPE_P2P_GO:
1065                 __cfg80211_stop_ap(rdev, dev, true);
1066                 break;
1067         case NL80211_IFTYPE_OCB:
1068                 __cfg80211_leave_ocb(rdev, dev);
1069                 break;
1070         case NL80211_IFTYPE_WDS:
1071                 /* must be handled by mac80211/driver, has no APIs */
1072                 break;
1073         case NL80211_IFTYPE_P2P_DEVICE:
1074         case NL80211_IFTYPE_NAN:
1075                 /* cannot happen, has no netdev */
1076                 break;
1077         case NL80211_IFTYPE_AP_VLAN:
1078         case NL80211_IFTYPE_MONITOR:
1079                 /* nothing to do */
1080                 break;
1081         case NL80211_IFTYPE_UNSPECIFIED:
1082         case NUM_NL80211_IFTYPES:
1083                 /* invalid */
1084                 break;
1085         }
1086 }
1087
1088 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1089                     struct wireless_dev *wdev)
1090 {
1091         wdev_lock(wdev);
1092         __cfg80211_leave(rdev, wdev);
1093         wdev_unlock(wdev);
1094 }
1095
1096 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1097                          gfp_t gfp)
1098 {
1099         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1100         struct cfg80211_event *ev;
1101         unsigned long flags;
1102
1103         trace_cfg80211_stop_iface(wiphy, wdev);
1104
1105         ev = kzalloc(sizeof(*ev), gfp);
1106         if (!ev)
1107                 return;
1108
1109         ev->type = EVENT_STOPPED;
1110
1111         spin_lock_irqsave(&wdev->event_lock, flags);
1112         list_add_tail(&ev->list, &wdev->event_list);
1113         spin_unlock_irqrestore(&wdev->event_lock, flags);
1114         queue_work(cfg80211_wq, &rdev->event_work);
1115 }
1116 EXPORT_SYMBOL(cfg80211_stop_iface);
1117
1118 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1119                                          unsigned long state, void *ptr)
1120 {
1121         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1122         struct wireless_dev *wdev = dev->ieee80211_ptr;
1123         struct cfg80211_registered_device *rdev;
1124         struct cfg80211_sched_scan_request *pos, *tmp;
1125
1126         if (!wdev)
1127                 return NOTIFY_DONE;
1128
1129         rdev = wiphy_to_rdev(wdev->wiphy);
1130
1131         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1132
1133         switch (state) {
1134         case NETDEV_POST_INIT:
1135                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1136                 break;
1137         case NETDEV_REGISTER:
1138                 /*
1139                  * NB: cannot take rdev->mtx here because this may be
1140                  * called within code protected by it when interfaces
1141                  * are added with nl80211.
1142                  */
1143                 mutex_init(&wdev->mtx);
1144                 INIT_LIST_HEAD(&wdev->event_list);
1145                 spin_lock_init(&wdev->event_lock);
1146                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1147                 spin_lock_init(&wdev->mgmt_registrations_lock);
1148
1149                 /*
1150                  * We get here also when the interface changes network namespaces,
1151                  * as it's registered into the new one, but we don't want it to
1152                  * change ID in that case. Checking if the ID is already assigned
1153                  * works, because 0 isn't considered a valid ID and the memory is
1154                  * 0-initialized.
1155                  */
1156                 if (!wdev->identifier)
1157                         wdev->identifier = ++rdev->wdev_id;
1158                 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1159                 rdev->devlist_generation++;
1160                 /* can only change netns with wiphy */
1161                 dev->features |= NETIF_F_NETNS_LOCAL;
1162
1163                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1164                                       "phy80211")) {
1165                         pr_err("failed to add phy80211 symlink to netdev!\n");
1166                 }
1167                 wdev->netdev = dev;
1168 #ifdef CONFIG_CFG80211_WEXT
1169                 wdev->wext.default_key = -1;
1170                 wdev->wext.default_mgmt_key = -1;
1171                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1172 #endif
1173
1174                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1175                         wdev->ps = true;
1176                 else
1177                         wdev->ps = false;
1178                 /* allow mac80211 to determine the timeout */
1179                 wdev->ps_timeout = -1;
1180
1181                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1182                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1183                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1184                         dev->priv_flags |= IFF_DONT_BRIDGE;
1185
1186                 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1187
1188                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1189                 break;
1190         case NETDEV_GOING_DOWN:
1191                 cfg80211_leave(rdev, wdev);
1192                 break;
1193         case NETDEV_DOWN:
1194                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1195                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1196                         if (WARN_ON(!rdev->scan_req->notified))
1197                                 rdev->scan_req->info.aborted = true;
1198                         ___cfg80211_scan_done(rdev, false);
1199                 }
1200
1201                 list_for_each_entry_safe(pos, tmp,
1202                                          &rdev->sched_scan_req_list, list) {
1203                         if (WARN_ON(pos && pos->dev == wdev->netdev))
1204                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1205                 }
1206
1207                 rdev->opencount--;
1208                 wake_up(&rdev->dev_wait);
1209                 break;
1210         case NETDEV_UP:
1211                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1212                 wdev_lock(wdev);
1213                 switch (wdev->iftype) {
1214 #ifdef CONFIG_CFG80211_WEXT
1215                 case NL80211_IFTYPE_ADHOC:
1216                         cfg80211_ibss_wext_join(rdev, wdev);
1217                         break;
1218                 case NL80211_IFTYPE_STATION:
1219                         cfg80211_mgd_wext_connect(rdev, wdev);
1220                         break;
1221 #endif
1222 #ifdef CONFIG_MAC80211_MESH
1223                 case NL80211_IFTYPE_MESH_POINT:
1224                         {
1225                                 /* backward compat code... */
1226                                 struct mesh_setup setup;
1227                                 memcpy(&setup, &default_mesh_setup,
1228                                                 sizeof(setup));
1229                                  /* back compat only needed for mesh_id */
1230                                 setup.mesh_id = wdev->ssid;
1231                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1232                                 if (wdev->mesh_id_up_len)
1233                                         __cfg80211_join_mesh(rdev, dev,
1234                                                         &setup,
1235                                                         &default_mesh_config);
1236                                 break;
1237                         }
1238 #endif
1239                 default:
1240                         break;
1241                 }
1242                 wdev_unlock(wdev);
1243                 rdev->opencount++;
1244
1245                 /*
1246                  * Configure power management to the driver here so that its
1247                  * correctly set also after interface type changes etc.
1248                  */
1249                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1250                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1251                     rdev->ops->set_power_mgmt &&
1252                     rdev_set_power_mgmt(rdev, dev, wdev->ps,
1253                                         wdev->ps_timeout)) {
1254                         /* assume this means it's off */
1255                         wdev->ps = false;
1256                 }
1257                 break;
1258         case NETDEV_UNREGISTER:
1259                 /*
1260                  * It is possible to get NETDEV_UNREGISTER
1261                  * multiple times. To detect that, check
1262                  * that the interface is still on the list
1263                  * of registered interfaces, and only then
1264                  * remove and clean it up.
1265                  */
1266                 if (!list_empty(&wdev->list)) {
1267                         nl80211_notify_iface(rdev, wdev,
1268                                              NL80211_CMD_DEL_INTERFACE);
1269                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1270                         list_del_rcu(&wdev->list);
1271                         rdev->devlist_generation++;
1272                         cfg80211_mlme_purge_registrations(wdev);
1273 #ifdef CONFIG_CFG80211_WEXT
1274                         kzfree(wdev->wext.keys);
1275 #endif
1276                         flush_work(&wdev->disconnect_wk);
1277                         cfg80211_cqm_config_free(wdev);
1278                 }
1279                 /*
1280                  * synchronise (so that we won't find this netdev
1281                  * from other code any more) and then clear the list
1282                  * head so that the above code can safely check for
1283                  * !list_empty() to avoid double-cleanup.
1284                  */
1285                 synchronize_rcu();
1286                 INIT_LIST_HEAD(&wdev->list);
1287                 /*
1288                  * Ensure that all events have been processed and
1289                  * freed.
1290                  */
1291                 cfg80211_process_wdev_events(wdev);
1292
1293                 if (WARN_ON(wdev->current_bss)) {
1294                         cfg80211_unhold_bss(wdev->current_bss);
1295                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1296                         wdev->current_bss = NULL;
1297                 }
1298                 break;
1299         case NETDEV_PRE_UP:
1300                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1301                         return notifier_from_errno(-EOPNOTSUPP);
1302                 if (rfkill_blocked(rdev->rfkill))
1303                         return notifier_from_errno(-ERFKILL);
1304                 break;
1305         default:
1306                 return NOTIFY_DONE;
1307         }
1308
1309         wireless_nlevent_flush();
1310
1311         return NOTIFY_OK;
1312 }
1313
1314 static struct notifier_block cfg80211_netdev_notifier = {
1315         .notifier_call = cfg80211_netdev_notifier_call,
1316 };
1317
1318 static void __net_exit cfg80211_pernet_exit(struct net *net)
1319 {
1320         struct cfg80211_registered_device *rdev;
1321
1322         rtnl_lock();
1323         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1324                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1325                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1326         }
1327         rtnl_unlock();
1328 }
1329
1330 static struct pernet_operations cfg80211_pernet_ops = {
1331         .exit = cfg80211_pernet_exit,
1332 };
1333
1334 static int __init cfg80211_init(void)
1335 {
1336         int err;
1337
1338         err = register_pernet_device(&cfg80211_pernet_ops);
1339         if (err)
1340                 goto out_fail_pernet;
1341
1342         err = wiphy_sysfs_init();
1343         if (err)
1344                 goto out_fail_sysfs;
1345
1346         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1347         if (err)
1348                 goto out_fail_notifier;
1349
1350         err = nl80211_init();
1351         if (err)
1352                 goto out_fail_nl80211;
1353
1354         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1355
1356         err = regulatory_init();
1357         if (err)
1358                 goto out_fail_reg;
1359
1360         cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1361         if (!cfg80211_wq) {
1362                 err = -ENOMEM;
1363                 goto out_fail_wq;
1364         }
1365
1366         return 0;
1367
1368 out_fail_wq:
1369         regulatory_exit();
1370 out_fail_reg:
1371         debugfs_remove(ieee80211_debugfs_dir);
1372         nl80211_exit();
1373 out_fail_nl80211:
1374         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1375 out_fail_notifier:
1376         wiphy_sysfs_exit();
1377 out_fail_sysfs:
1378         unregister_pernet_device(&cfg80211_pernet_ops);
1379 out_fail_pernet:
1380         return err;
1381 }
1382 subsys_initcall(cfg80211_init);
1383
1384 static void __exit cfg80211_exit(void)
1385 {
1386         debugfs_remove(ieee80211_debugfs_dir);
1387         nl80211_exit();
1388         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1389         wiphy_sysfs_exit();
1390         regulatory_exit();
1391         unregister_pernet_device(&cfg80211_pernet_ops);
1392         destroy_workqueue(cfg80211_wq);
1393 }
1394 module_exit(cfg80211_exit);