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 cfg80211_iface_destroy *item;
 309
 310         ASSERT_RTNL();
 311
 312         spin_lock_irq(&rdev->destroy_list_lock);
 313         while ((item = list_first_entry_or_null(&rdev->destroy_list,
 314                                                 struct cfg80211_iface_destroy,
 315                                                 list))) {
 316                 struct wireless_dev *wdev, *tmp;
 317                 u32 nlportid = item->nlportid;
 318
 319                 list_del(&item->list);
 320                 kfree(item);
 321                 spin_unlock_irq(&rdev->destroy_list_lock);
 322
 323                 list_for_each_entry_safe(wdev, tmp,
 324                                          &rdev->wiphy.wdev_list, list) {
 325                         if (nlportid == wdev->owner_nlportid)
 326                                 rdev_del_virtual_intf(rdev, wdev);
 327                 }
 328
 329                 spin_lock_irq(&rdev->destroy_list_lock);
 330         }
 331         spin_unlock_irq(&rdev->destroy_list_lock);
 332 }
 333
 334 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 335 {
 336         struct cfg80211_registered_device *rdev;
 337
 338         rdev = container_of(work, struct cfg80211_registered_device,
 339                             destroy_work);
 340
 341         rtnl_lock();
 342         cfg80211_destroy_ifaces(rdev);
 343         rtnl_unlock();
 344 }
 345
 346 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
 347 {
 348         struct cfg80211_registered_device *rdev;
 349
 350         rdev = container_of(work, struct cfg80211_registered_device,
 351                            sched_scan_stop_wk);
 352
 353         rtnl_lock();
 354
 355         __cfg80211_stop_sched_scan(rdev, false);
 356
 357         rtnl_unlock();
 358 }
 359
 360 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
 361 {
 362         struct cfg80211_registered_device *rdev;
 363
 364         rdev = container_of(work, struct cfg80211_registered_device,
 365                             propagate_radar_detect_wk);
 366
 367         rtnl_lock();
 368
 369         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
 370                                        NL80211_DFS_UNAVAILABLE,
 371                                        NL80211_RADAR_DETECTED);
 372
 373         rtnl_unlock();
 374 }
 375
 376 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
 377 {
 378         struct cfg80211_registered_device *rdev;
 379
 380         rdev = container_of(work, struct cfg80211_registered_device,
 381                             propagate_cac_done_wk);
 382
 383         rtnl_lock();
 384
 385         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
 386                                        NL80211_DFS_AVAILABLE,
 387                                        NL80211_RADAR_CAC_FINISHED);
 388
 389         rtnl_unlock();
 390 }
 391
 392 /* exported functions */
 393
 394 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 395                            const char *requested_name)
 396 {
 397         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 398
 399         struct cfg80211_registered_device *rdev;
 400         int alloc_size;
 401
 402         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 403         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 404         WARN_ON(ops->connect && !ops->disconnect);
 405         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 406         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 407         WARN_ON(ops->add_station && !ops->del_station);
 408         WARN_ON(ops->add_mpath && !ops->del_mpath);
 409         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 410         WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
 411         WARN_ON(ops->start_ap && !ops->stop_ap);
 412         WARN_ON(ops->join_ocb && !ops->leave_ocb);
 413         WARN_ON(ops->suspend && !ops->resume);
 414         WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
 415         WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
 416         WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
 417         WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
 418
 419         alloc_size = sizeof(*rdev) + sizeof_priv;
 420
 421         rdev = kzalloc(alloc_size, GFP_KERNEL);
 422         if (!rdev)
 423                 return NULL;
 424
 425         rdev->ops = ops;
 426
 427         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 428
 429         if (unlikely(rdev->wiphy_idx < 0)) {
 430                 /* ugh, wrapped! */
 431                 atomic_dec(&wiphy_counter);
 432                 kfree(rdev);
 433                 return NULL;
 434         }
 435
 436         /* atomic_inc_return makes it start at 1, make it start at 0 */
 437         rdev->wiphy_idx--;
 438
 439         /* give it a proper name */
 440         if (requested_name && requested_name[0]) {
 441                 int rv;
 442
 443                 rtnl_lock();
 444                 rv = cfg80211_dev_check_name(rdev, requested_name);
 445
 446                 if (rv < 0) {
 447                         rtnl_unlock();
 448                         goto use_default_name;
 449                 }
 450
 451                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 452                 rtnl_unlock();
 453                 if (rv)
 454                         goto use_default_name;
 455         } else {
 456 use_default_name:
 457                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 458                  * the restrictions on phy names.  Probably this call could
 459                  * fail if some other part of the kernel (re)named a device
 460                  * phyX.  But, might should add some locking and check return
 461                  * value, and use a different name if this one exists?
 462                  */
 463                 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 464         }
 465
 466         INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
 467         INIT_LIST_HEAD(&rdev->beacon_registrations);
 468         spin_lock_init(&rdev->beacon_registrations_lock);
 469         spin_lock_init(&rdev->bss_lock);
 470         INIT_LIST_HEAD(&rdev->bss_list);
 471         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 472         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 473         INIT_LIST_HEAD(&rdev->mlme_unreg);
 474         spin_lock_init(&rdev->mlme_unreg_lock);
 475         INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
 476         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 477                           cfg80211_dfs_channels_update_work);
 478 #ifdef CONFIG_CFG80211_WEXT
 479         rdev->wiphy.wext = &cfg80211_wext_handler;
 480 #endif
 481
 482         device_initialize(&rdev->wiphy.dev);
 483         rdev->wiphy.dev.class = &ieee80211_class;
 484         rdev->wiphy.dev.platform_data = rdev;
 485         device_enable_async_suspend(&rdev->wiphy.dev);
 486
 487         INIT_LIST_HEAD(&rdev->destroy_list);
 488         spin_lock_init(&rdev->destroy_list_lock);
 489         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 490         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 491         INIT_WORK(&rdev->propagate_radar_detect_wk,
 492                   cfg80211_propagate_radar_detect_wk);
 493         INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
 494
 495 #ifdef CONFIG_CFG80211_DEFAULT_PS
 496         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 497 #endif
 498
 499         wiphy_net_set(&rdev->wiphy, &init_net);
 500
 501         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 502         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 503                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 504                                    &rdev->rfkill_ops, rdev);
 505
 506         if (!rdev->rfkill) {
 507                 kfree(rdev);
 508                 return NULL;
 509         }
 510
 511         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 512         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 513         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 514
 515         init_waitqueue_head(&rdev->dev_wait);
 516
 517         /*
 518          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 519          * Fragmentation and RTS threshold are disabled by default with the
 520          * special -1 value.
 521          */
 522         rdev->wiphy.retry_short = 7;
 523         rdev->wiphy.retry_long = 4;
 524         rdev->wiphy.frag_threshold = (u32) -1;
 525         rdev->wiphy.rts_threshold = (u32) -1;
 526         rdev->wiphy.coverage_class = 0;
 527
 528         rdev->wiphy.max_num_csa_counters = 1;
 529
 530         rdev->wiphy.max_sched_scan_plans = 1;
 531         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 532
 533         return &rdev->wiphy;
 534 }
 535 EXPORT_SYMBOL(wiphy_new_nm);
 536
 537 static int wiphy_verify_combinations(struct wiphy *wiphy)
 538 {
 539         const struct ieee80211_iface_combination *c;
 540         int i, j;
 541
 542         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 543                 u32 cnt = 0;
 544                 u16 all_iftypes = 0;
 545
 546                 c = &wiphy->iface_combinations[i];
 547
 548                 /*
 549                  * Combinations with just one interface aren't real,
 550                  * however we make an exception for DFS.
 551                  */
 552                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 553                         return -EINVAL;
 554
 555                 /* Need at least one channel */
 556                 if (WARN_ON(!c->num_different_channels))
 557                         return -EINVAL;
 558
 559                 /*
 560                  * Put a sane limit on maximum number of different
 561                  * channels to simplify channel accounting code.
 562                  */
 563                 if (WARN_ON(c->num_different_channels >
 564                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 565                         return -EINVAL;
 566
 567                 /* DFS only works on one channel. */
 568                 if (WARN_ON(c->radar_detect_widths &&
 569                             (c->num_different_channels > 1)))
 570                         return -EINVAL;
 571
 572                 if (WARN_ON(!c->n_limits))
 573                         return -EINVAL;
 574
 575                 for (j = 0; j < c->n_limits; j++) {
 576                         u16 types = c->limits[j].types;
 577
 578                         /* interface types shouldn't overlap */
 579                         if (WARN_ON(types & all_iftypes))
 580                                 return -EINVAL;
 581                         all_iftypes |= types;
 582
 583                         if (WARN_ON(!c->limits[j].max))
 584                                 return -EINVAL;
 585
 586                         /* Shouldn't list software iftypes in combinations! */
 587                         if (WARN_ON(wiphy->software_iftypes & types))
 588                                 return -EINVAL;
 589
 590                         /* Only a single P2P_DEVICE can be allowed */
 591                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 592                                     c->limits[j].max > 1))
 593                                 return -EINVAL;
 594
 595                         /* Only a single NAN can be allowed */
 596                         if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
 597                                     c->limits[j].max > 1))
 598                                 return -EINVAL;
 599
 600                         /*
 601                          * This isn't well-defined right now. If you have an
 602                          * IBSS interface, then its beacon interval may change
 603                          * by joining other networks, and nothing prevents it
 604                          * from doing that.
 605                          * So technically we probably shouldn't even allow AP
 606                          * and IBSS in the same interface, but it seems that
 607                          * some drivers support that, possibly only with fixed
 608                          * beacon intervals for IBSS.
 609                          */
 610                         if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
 611                                     c->beacon_int_min_gcd)) {
 612                                 return -EINVAL;
 613                         }
 614
 615                         cnt += c->limits[j].max;
 616                         /*
 617                          * Don't advertise an unsupported type
 618                          * in a combination.
 619                          */
 620                         if (WARN_ON((wiphy->interface_modes & types) != types))
 621                                 return -EINVAL;
 622                 }
 623
 624 #ifndef CONFIG_WIRELESS_WDS
 625                 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
 626                         return -EINVAL;
 627 #endif
 628
 629                 /* You can't even choose that many! */
 630                 if (WARN_ON(cnt < c->max_interfaces))
 631                         return -EINVAL;
 632         }
 633
 634         return 0;
 635 }
 636
 637 int wiphy_register(struct wiphy *wiphy)
 638 {
 639         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 640         int res;
 641         enum nl80211_band band;
 642         struct ieee80211_supported_band *sband;
 643         bool have_band = false;
 644         int i;
 645         u16 ifmodes = wiphy->interface_modes;
 646
 647 #ifdef CONFIG_PM
 648         if (WARN_ON(wiphy->wowlan &&
 649                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 650                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 651                 return -EINVAL;
 652         if (WARN_ON(wiphy->wowlan &&
 653                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 654                     !wiphy->wowlan->tcp))
 655                 return -EINVAL;
 656 #endif
 657         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 658                     (!rdev->ops->tdls_channel_switch ||
 659                      !rdev->ops->tdls_cancel_channel_switch)))
 660                 return -EINVAL;
 661
 662         if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
 663                     (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
 664                      !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
 665                      !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
 666                 return -EINVAL;
 667
 668 #ifndef CONFIG_WIRELESS_WDS
 669         if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
 670                 return -EINVAL;
 671 #endif
 672
 673         /*
 674          * if a wiphy has unsupported modes for regulatory channel enforcement,
 675          * opt-out of enforcement checking
 676          */
 677         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 678                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 679                                        BIT(NL80211_IFTYPE_AP) |
 680                                        BIT(NL80211_IFTYPE_P2P_GO) |
 681                                        BIT(NL80211_IFTYPE_ADHOC) |
 682                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 683                                        BIT(NL80211_IFTYPE_NAN) |
 684                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 685                                        BIT(NL80211_IFTYPE_MONITOR)))
 686                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 687
 688         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 689                     (wiphy->regulatory_flags &
 690                                         (REGULATORY_CUSTOM_REG |
 691                                          REGULATORY_STRICT_REG |
 692                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 693                                          REGULATORY_COUNTRY_IE_IGNORE))))
 694                 return -EINVAL;
 695
 696         if (WARN_ON(wiphy->coalesce &&
 697                     (!wiphy->coalesce->n_rules ||
 698                      !wiphy->coalesce->n_patterns) &&
 699                     (!wiphy->coalesce->pattern_min_len ||
 700                      wiphy->coalesce->pattern_min_len >
 701                         wiphy->coalesce->pattern_max_len)))
 702                 return -EINVAL;
 703
 704         if (WARN_ON(wiphy->ap_sme_capa &&
 705                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 706                 return -EINVAL;
 707
 708         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 709                 return -EINVAL;
 710
 711         if (WARN_ON(wiphy->addresses &&
 712                     !is_zero_ether_addr(wiphy->perm_addr) &&
 713                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 714                            ETH_ALEN)))
 715                 return -EINVAL;
 716
 717         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 718                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 719                      !rdev->ops->set_mac_acl)))
 720                 return -EINVAL;
 721
 722         /* assure only valid behaviours are flagged by driver
 723          * hence subtract 2 as bit 0 is invalid.
 724          */
 725         if (WARN_ON(wiphy->bss_select_support &&
 726                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 727                 return -EINVAL;
 728
 729         if (wiphy->addresses)
 730                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 731
 732         /* sanity check ifmodes */
 733         WARN_ON(!ifmodes);
 734         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 735         if (WARN_ON(ifmodes != wiphy->interface_modes))
 736                 wiphy->interface_modes = ifmodes;
 737
 738         res = wiphy_verify_combinations(wiphy);
 739         if (res)
 740                 return res;
 741
 742         /* sanity check supported bands/channels */
 743         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 744                 sband = wiphy->bands[band];
 745                 if (!sband)
 746                         continue;
 747
 748                 sband->band = band;
 749                 if (WARN_ON(!sband->n_channels))
 750                         return -EINVAL;
 751                 /*
 752                  * on 60GHz band, there are no legacy rates, so
 753                  * n_bitrates is 0
 754                  */
 755                 if (WARN_ON(band != NL80211_BAND_60GHZ &&
 756                             !sband->n_bitrates))
 757                         return -EINVAL;
 758
 759                 /*
 760                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 761                  * modify the sband's ht data even if the driver uses a
 762                  * global structure for that.
 763                  */
 764                 if (cfg80211_disable_40mhz_24ghz &&
 765                     band == NL80211_BAND_2GHZ &&
 766                     sband->ht_cap.ht_supported) {
 767                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 768                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 769                 }
 770
 771                 /*
 772                  * Since we use a u32 for rate bitmaps in
 773                  * ieee80211_get_response_rate, we cannot
 774                  * have more than 32 legacy rates.
 775                  */
 776                 if (WARN_ON(sband->n_bitrates > 32))
 777                         return -EINVAL;
 778
 779                 for (i = 0; i < sband->n_channels; i++) {
 780                         sband->channels[i].orig_flags =
 781                                 sband->channels[i].flags;
 782                         sband->channels[i].orig_mag = INT_MAX;
 783                         sband->channels[i].orig_mpwr =
 784                                 sband->channels[i].max_power;
 785                         sband->channels[i].band = band;
 786                 }
 787
 788                 have_band = true;
 789         }
 790
 791         if (!have_band) {
 792                 WARN_ON(1);
 793                 return -EINVAL;
 794         }
 795
 796 #ifdef CONFIG_PM
 797         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 798                     (!rdev->wiphy.wowlan->pattern_min_len ||
 799                      rdev->wiphy.wowlan->pattern_min_len >
 800                                 rdev->wiphy.wowlan->pattern_max_len)))
 801                 return -EINVAL;
 802 #endif
 803
 804         /* check and set up bitrates */
 805         ieee80211_set_bitrate_flags(wiphy);
 806
 807         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 808
 809         rtnl_lock();
 810         res = device_add(&rdev->wiphy.dev);
 811         if (res) {
 812                 rtnl_unlock();
 813                 return res;
 814         }
 815
 816         /* set up regulatory info */
 817         wiphy_regulatory_register(wiphy);
 818
 819         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 820         cfg80211_rdev_list_generation++;
 821
 822         /* add to debugfs */
 823         rdev->wiphy.debugfsdir =
 824                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 825                                    ieee80211_debugfs_dir);
 826         if (IS_ERR(rdev->wiphy.debugfsdir))
 827                 rdev->wiphy.debugfsdir = NULL;
 828
 829         cfg80211_debugfs_rdev_add(rdev);
 830         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 831
 832         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 833                 struct regulatory_request request;
 834
 835                 request.wiphy_idx = get_wiphy_idx(wiphy);
 836                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 837                 request.alpha2[0] = '9';
 838                 request.alpha2[1] = '9';
 839
 840                 nl80211_send_reg_change_event(&request);
 841         }
 842
 843         /* Check that nobody globally advertises any capabilities they do not
 844          * advertise on all possible interface types.
 845          */
 846         if (wiphy->extended_capabilities_len &&
 847             wiphy->num_iftype_ext_capab &&
 848             wiphy->iftype_ext_capab) {
 849                 u8 supported_on_all, j;
 850                 const struct wiphy_iftype_ext_capab *capab;
 851
 852                 capab = wiphy->iftype_ext_capab;
 853                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
 854                         if (capab[0].extended_capabilities_len > j)
 855                                 supported_on_all =
 856                                         capab[0].extended_capabilities[j];
 857                         else
 858                                 supported_on_all = 0x00;
 859                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
 860                                 if (j >= capab[i].extended_capabilities_len) {
 861                                         supported_on_all = 0x00;
 862                                         break;
 863                                 }
 864                                 supported_on_all &=
 865                                         capab[i].extended_capabilities[j];
 866                         }
 867                         if (WARN_ON(wiphy->extended_capabilities[j] &
 868                                     ~supported_on_all))
 869                                 break;
 870                 }
 871         }
 872
 873         rdev->wiphy.registered = true;
 874         rtnl_unlock();
 875
 876         res = rfkill_register(rdev->rfkill);
 877         if (res) {
 878                 rfkill_destroy(rdev->rfkill);
 879                 rdev->rfkill = NULL;
 880                 wiphy_unregister(&rdev->wiphy);
 881                 return res;
 882         }
 883
 884         return 0;
 885 }
 886 EXPORT_SYMBOL(wiphy_register);
 887
 888 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 889 {
 890         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 891
 892         if (!rdev->ops->rfkill_poll)
 893                 return;
 894         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 895         rfkill_resume_polling(rdev->rfkill);
 896 }
 897 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 898
 899 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 900 {
 901         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 902
 903         rfkill_pause_polling(rdev->rfkill);
 904 }
 905 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 906
 907 void wiphy_unregister(struct wiphy *wiphy)
 908 {
 909         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 910
 911         wait_event(rdev->dev_wait, ({
 912                 int __count;
 913                 rtnl_lock();
 914                 __count = rdev->opencount;
 915                 rtnl_unlock();
 916                 __count == 0; }));
 917
 918         if (rdev->rfkill)
 919                 rfkill_unregister(rdev->rfkill);
 920
 921         rtnl_lock();
 922         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 923         rdev->wiphy.registered = false;
 924
 925         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
 926
 927         /*
 928          * First remove the hardware from everywhere, this makes
 929          * it impossible to find from userspace.
 930          */
 931         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 932         list_del_rcu(&rdev->list);
 933         synchronize_rcu();
 934
 935         /*
 936          * If this device got a regulatory hint tell core its
 937          * free to listen now to a new shiny device regulatory hint
 938          */
 939         wiphy_regulatory_deregister(wiphy);
 940
 941         cfg80211_rdev_list_generation++;
 942         device_del(&rdev->wiphy.dev);
 943
 944         rtnl_unlock();
 945
 946         flush_work(&rdev->scan_done_wk);
 947         cancel_work_sync(&rdev->conn_work);
 948         flush_work(&rdev->event_work);
 949         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 950         flush_work(&rdev->destroy_work);
 951         flush_work(&rdev->sched_scan_stop_wk);
 952         flush_work(&rdev->mlme_unreg_wk);
 953         flush_work(&rdev->propagate_radar_detect_wk);
 954         flush_work(&rdev->propagate_cac_done_wk);
 955
 956 #ifdef CONFIG_PM
 957         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
 958                 rdev_set_wakeup(rdev, false);
 959 #endif
 960         cfg80211_rdev_free_wowlan(rdev);
 961         cfg80211_rdev_free_coalesce(rdev);
 962 }
 963 EXPORT_SYMBOL(wiphy_unregister);
 964
 965 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 966 {
 967         struct cfg80211_internal_bss *scan, *tmp;
 968         struct cfg80211_beacon_registration *reg, *treg;
 969         rfkill_destroy(rdev->rfkill);
 970         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 971                 list_del(&reg->list);
 972                 kfree(reg);
 973         }
 974         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 975                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 976         kfree(rdev);
 977 }
 978
 979 void wiphy_free(struct wiphy *wiphy)
 980 {
 981         put_device(&wiphy->dev);
 982 }
 983 EXPORT_SYMBOL(wiphy_free);
 984
 985 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 986 {
 987         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 988
 989         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 990                 schedule_work(&rdev->rfkill_sync);
 991 }
 992 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 993
 994 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
 995 {
 996         kfree(wdev->cqm_config);
 997         wdev->cqm_config = NULL;
 998 }
 999
1000 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1001 {
1002         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1003
1004         ASSERT_RTNL();
1005
1006         if (WARN_ON(wdev->netdev))
1007                 return;
1008
1009         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1010
1011         list_del_rcu(&wdev->list);
1012         rdev->devlist_generation++;
1013
1014         switch (wdev->iftype) {
1015         case NL80211_IFTYPE_P2P_DEVICE:
1016                 cfg80211_mlme_purge_registrations(wdev);
1017                 cfg80211_stop_p2p_device(rdev, wdev);
1018                 break;
1019         case NL80211_IFTYPE_NAN:
1020                 cfg80211_stop_nan(rdev, wdev);
1021                 break;
1022         default:
1023                 WARN_ON_ONCE(1);
1024                 break;
1025         }
1026
1027         cfg80211_cqm_config_free(wdev);
1028 }
1029 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1030
1031 static const struct device_type wiphy_type = {
1032         .name   = "wlan",
1033 };
1034
1035 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1036                                enum nl80211_iftype iftype, int num)
1037 {
1038         ASSERT_RTNL();
1039
1040         rdev->num_running_ifaces += num;
1041         if (iftype == NL80211_IFTYPE_MONITOR)
1042                 rdev->num_running_monitor_ifaces += num;
1043 }
1044
1045 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1046                       struct wireless_dev *wdev)
1047 {
1048         struct net_device *dev = wdev->netdev;
1049         struct cfg80211_sched_scan_request *sched_scan_req;
1050
1051         ASSERT_RTNL();
1052         ASSERT_WDEV_LOCK(wdev);
1053
1054         switch (wdev->iftype) {
1055         case NL80211_IFTYPE_ADHOC:
1056                 __cfg80211_leave_ibss(rdev, dev, true);
1057                 break;
1058         case NL80211_IFTYPE_P2P_CLIENT:
1059         case NL80211_IFTYPE_STATION:
1060                 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1061                 if (sched_scan_req && dev == sched_scan_req->dev)
1062                         __cfg80211_stop_sched_scan(rdev, false);
1063
1064 #ifdef CONFIG_CFG80211_WEXT
1065                 kfree(wdev->wext.ie);
1066                 wdev->wext.ie = NULL;
1067                 wdev->wext.ie_len = 0;
1068                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1069 #endif
1070                 cfg80211_disconnect(rdev, dev,
1071                                     WLAN_REASON_DEAUTH_LEAVING, true);
1072                 break;
1073         case NL80211_IFTYPE_MESH_POINT:
1074                 __cfg80211_leave_mesh(rdev, dev);
1075                 break;
1076         case NL80211_IFTYPE_AP:
1077         case NL80211_IFTYPE_P2P_GO:
1078                 __cfg80211_stop_ap(rdev, dev, true);
1079                 break;
1080         case NL80211_IFTYPE_OCB:
1081                 __cfg80211_leave_ocb(rdev, dev);
1082                 break;
1083         case NL80211_IFTYPE_WDS:
1084                 /* must be handled by mac80211/driver, has no APIs */
1085                 break;
1086         case NL80211_IFTYPE_P2P_DEVICE:
1087         case NL80211_IFTYPE_NAN:
1088                 /* cannot happen, has no netdev */
1089                 break;
1090         case NL80211_IFTYPE_AP_VLAN:
1091         case NL80211_IFTYPE_MONITOR:
1092                 /* nothing to do */
1093                 break;
1094         case NL80211_IFTYPE_UNSPECIFIED:
1095         case NUM_NL80211_IFTYPES:
1096                 /* invalid */
1097                 break;
1098         }
1099 }
1100
1101 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1102                     struct wireless_dev *wdev)
1103 {
1104         wdev_lock(wdev);
1105         __cfg80211_leave(rdev, wdev);
1106         wdev_unlock(wdev);
1107 }
1108
1109 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1110                          gfp_t gfp)
1111 {
1112         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1113         struct cfg80211_event *ev;
1114         unsigned long flags;
1115
1116         trace_cfg80211_stop_iface(wiphy, wdev);
1117
1118         ev = kzalloc(sizeof(*ev), gfp);
1119         if (!ev)
1120                 return;
1121
1122         ev->type = EVENT_STOPPED;
1123
1124         spin_lock_irqsave(&wdev->event_lock, flags);
1125         list_add_tail(&ev->list, &wdev->event_list);
1126         spin_unlock_irqrestore(&wdev->event_lock, flags);
1127         queue_work(cfg80211_wq, &rdev->event_work);
1128 }
1129 EXPORT_SYMBOL(cfg80211_stop_iface);
1130
1131 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1132                                          unsigned long state, void *ptr)
1133 {
1134         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1135         struct wireless_dev *wdev = dev->ieee80211_ptr;
1136         struct cfg80211_registered_device *rdev;
1137         struct cfg80211_sched_scan_request *sched_scan_req;
1138
1139         if (!wdev)
1140                 return NOTIFY_DONE;
1141
1142         rdev = wiphy_to_rdev(wdev->wiphy);
1143
1144         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1145
1146         switch (state) {
1147         case NETDEV_POST_INIT:
1148                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1149                 break;
1150         case NETDEV_REGISTER:
1151                 /*
1152                  * NB: cannot take rdev->mtx here because this may be
1153                  * called within code protected by it when interfaces
1154                  * are added with nl80211.
1155                  */
1156                 mutex_init(&wdev->mtx);
1157                 INIT_LIST_HEAD(&wdev->event_list);
1158                 spin_lock_init(&wdev->event_lock);
1159                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1160                 spin_lock_init(&wdev->mgmt_registrations_lock);
1161
1162                 /*
1163                  * We get here also when the interface changes network namespaces,
1164                  * as it's registered into the new one, but we don't want it to
1165                  * change ID in that case. Checking if the ID is already assigned
1166                  * works, because 0 isn't considered a valid ID and the memory is
1167                  * 0-initialized.
1168                  */
1169                 if (!wdev->identifier)
1170                         wdev->identifier = ++rdev->wdev_id;
1171                 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1172                 rdev->devlist_generation++;
1173                 /* can only change netns with wiphy */
1174                 dev->features |= NETIF_F_NETNS_LOCAL;
1175
1176                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1177                                       "phy80211")) {
1178                         pr_err("failed to add phy80211 symlink to netdev!\n");
1179                 }
1180                 wdev->netdev = dev;
1181 #ifdef CONFIG_CFG80211_WEXT
1182                 wdev->wext.default_key = -1;
1183                 wdev->wext.default_mgmt_key = -1;
1184                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1185 #endif
1186
1187                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1188                         wdev->ps = true;
1189                 else
1190                         wdev->ps = false;
1191                 /* allow mac80211 to determine the timeout */
1192                 wdev->ps_timeout = -1;
1193
1194                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1195                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1196                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1197                         dev->priv_flags |= IFF_DONT_BRIDGE;
1198
1199                 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1200
1201                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1202                 break;
1203         case NETDEV_GOING_DOWN:
1204                 cfg80211_leave(rdev, wdev);
1205                 break;
1206         case NETDEV_DOWN:
1207                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1208                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1209                         if (WARN_ON(!rdev->scan_req->notified))
1210                                 rdev->scan_req->info.aborted = true;
1211                         ___cfg80211_scan_done(rdev, false);
1212                 }
1213
1214                 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1215                 if (WARN_ON(sched_scan_req &&
1216                             sched_scan_req->dev == wdev->netdev)) {
1217                         __cfg80211_stop_sched_scan(rdev, false);
1218                 }
1219
1220                 rdev->opencount--;
1221                 wake_up(&rdev->dev_wait);
1222                 break;
1223         case NETDEV_UP:
1224                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1225                 wdev_lock(wdev);
1226                 switch (wdev->iftype) {
1227 #ifdef CONFIG_CFG80211_WEXT
1228                 case NL80211_IFTYPE_ADHOC:
1229                         cfg80211_ibss_wext_join(rdev, wdev);
1230                         break;
1231                 case NL80211_IFTYPE_STATION:
1232                         cfg80211_mgd_wext_connect(rdev, wdev);
1233                         break;
1234 #endif
1235 #ifdef CONFIG_MAC80211_MESH
1236                 case NL80211_IFTYPE_MESH_POINT:
1237                         {
1238                                 /* backward compat code... */
1239                                 struct mesh_setup setup;
1240                                 memcpy(&setup, &default_mesh_setup,
1241                                                 sizeof(setup));
1242                                  /* back compat only needed for mesh_id */
1243                                 setup.mesh_id = wdev->ssid;
1244                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1245                                 if (wdev->mesh_id_up_len)
1246                                         __cfg80211_join_mesh(rdev, dev,
1247                                                         &setup,
1248                                                         &default_mesh_config);
1249                                 break;
1250                         }
1251 #endif
1252                 default:
1253                         break;
1254                 }
1255                 wdev_unlock(wdev);
1256                 rdev->opencount++;
1257
1258                 /*
1259                  * Configure power management to the driver here so that its
1260                  * correctly set also after interface type changes etc.
1261                  */
1262                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1263                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1264                     rdev->ops->set_power_mgmt &&
1265                     rdev_set_power_mgmt(rdev, dev, wdev->ps,
1266                                         wdev->ps_timeout)) {
1267                         /* assume this means it's off */
1268                         wdev->ps = false;
1269                 }
1270                 break;
1271         case NETDEV_UNREGISTER:
1272                 /*
1273                  * It is possible to get NETDEV_UNREGISTER
1274                  * multiple times. To detect that, check
1275                  * that the interface is still on the list
1276                  * of registered interfaces, and only then
1277                  * remove and clean it up.
1278                  */
1279                 if (!list_empty(&wdev->list)) {
1280                         nl80211_notify_iface(rdev, wdev,
1281                                              NL80211_CMD_DEL_INTERFACE);
1282                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1283                         list_del_rcu(&wdev->list);
1284                         rdev->devlist_generation++;
1285                         cfg80211_mlme_purge_registrations(wdev);
1286 #ifdef CONFIG_CFG80211_WEXT
1287                         kzfree(wdev->wext.keys);
1288 #endif
1289                         flush_work(&wdev->disconnect_wk);
1290                         cfg80211_cqm_config_free(wdev);
1291                 }
1292                 /*
1293                  * synchronise (so that we won't find this netdev
1294                  * from other code any more) and then clear the list
1295                  * head so that the above code can safely check for
1296                  * !list_empty() to avoid double-cleanup.
1297                  */
1298                 synchronize_rcu();
1299                 INIT_LIST_HEAD(&wdev->list);
1300                 /*
1301                  * Ensure that all events have been processed and
1302                  * freed.
1303                  */
1304                 cfg80211_process_wdev_events(wdev);
1305
1306                 if (WARN_ON(wdev->current_bss)) {
1307                         cfg80211_unhold_bss(wdev->current_bss);
1308                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1309                         wdev->current_bss = NULL;
1310                 }
1311                 break;
1312         case NETDEV_PRE_UP:
1313                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1314                         return notifier_from_errno(-EOPNOTSUPP);
1315                 if (rfkill_blocked(rdev->rfkill))
1316                         return notifier_from_errno(-ERFKILL);
1317                 break;
1318         default:
1319                 return NOTIFY_DONE;
1320         }
1321
1322         wireless_nlevent_flush();
1323
1324         return NOTIFY_OK;
1325 }
1326
1327 static struct notifier_block cfg80211_netdev_notifier = {
1328         .notifier_call = cfg80211_netdev_notifier_call,
1329 };
1330
1331 static void __net_exit cfg80211_pernet_exit(struct net *net)
1332 {
1333         struct cfg80211_registered_device *rdev;
1334
1335         rtnl_lock();
1336         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1337                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1338                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1339         }
1340         rtnl_unlock();
1341 }
1342
1343 static struct pernet_operations cfg80211_pernet_ops = {
1344         .exit = cfg80211_pernet_exit,
1345 };
1346
1347 static int __init cfg80211_init(void)
1348 {
1349         int err;
1350
1351         err = register_pernet_device(&cfg80211_pernet_ops);
1352         if (err)
1353                 goto out_fail_pernet;
1354
1355         err = wiphy_sysfs_init();
1356         if (err)
1357                 goto out_fail_sysfs;
1358
1359         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1360         if (err)
1361                 goto out_fail_notifier;
1362
1363         err = nl80211_init();
1364         if (err)
1365                 goto out_fail_nl80211;
1366
1367         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1368
1369         err = regulatory_init();
1370         if (err)
1371                 goto out_fail_reg;
1372
1373         cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1374         if (!cfg80211_wq) {
1375                 err = -ENOMEM;
1376                 goto out_fail_wq;
1377         }
1378
1379         return 0;
1380
1381 out_fail_wq:
1382         regulatory_exit();
1383 out_fail_reg:
1384         debugfs_remove(ieee80211_debugfs_dir);
1385         nl80211_exit();
1386 out_fail_nl80211:
1387         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1388 out_fail_notifier:
1389         wiphy_sysfs_exit();
1390 out_fail_sysfs:
1391         unregister_pernet_device(&cfg80211_pernet_ops);
1392 out_fail_pernet:
1393         return err;
1394 }
1395 subsys_initcall(cfg80211_init);
1396
1397 static void __exit cfg80211_exit(void)
1398 {
1399         debugfs_remove(ieee80211_debugfs_dir);
1400         nl80211_exit();
1401         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1402         wiphy_sysfs_exit();
1403         regulatory_exit();
1404         unregister_pernet_device(&cfg80211_pernet_ops);
1405         destroy_workqueue(cfg80211_wq);
1406 }
1407 module_exit(cfg80211_exit);