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 2015-2017  Intel Deutschland GmbH
   7  * Copyright (C) 2018-2021 Intel Corporation
   8  */
   9
  10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11
  12 #include <linux/if.h>
  13 #include <linux/module.h>
  14 #include <linux/err.h>
  15 #include <linux/list.h>
  16 #include <linux/slab.h>
  17 #include <linux/nl80211.h>
  18 #include <linux/debugfs.h>
  19 #include <linux/notifier.h>
  20 #include <linux/device.h>
  21 #include <linux/etherdevice.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/sched.h>
  24 #include <net/genetlink.h>
  25 #include <net/cfg80211.h>
  26 #include "nl80211.h"
  27 #include "core.h"
  28 #include "sysfs.h"
  29 #include "debugfs.h"
  30 #include "wext-compat.h"
  31 #include "rdev-ops.h"
  32
  33 /* name for sysfs, %d is appended */
  34 #define PHY_NAME "phy"
  35
  36 MODULE_AUTHOR("Johannes Berg");
  37 MODULE_LICENSE("GPL");
  38 MODULE_DESCRIPTION("wireless configuration support");
  39 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
  40
  41 /* RCU-protected (and RTNL for writers) */
  42 LIST_HEAD(cfg80211_rdev_list);
  43 int cfg80211_rdev_list_generation;
  44
  45 /* for debugfs */
  46 static struct dentry *ieee80211_debugfs_dir;
  47
  48 /* for the cleanup, scan and event works */
  49 struct workqueue_struct *cfg80211_wq;
  50
  51 static bool cfg80211_disable_40mhz_24ghz;
  52 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  53 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  54                  "Disable 40MHz support in the 2.4GHz band");
  55
  56 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  57 {
  58         struct cfg80211_registered_device *result = NULL, *rdev;
  59
  60         ASSERT_RTNL();
  61
  62         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  63                 if (rdev->wiphy_idx == wiphy_idx) {
  64                         result = rdev;
  65                         break;
  66                 }
  67         }
  68
  69         return result;
  70 }
  71
  72 int get_wiphy_idx(struct wiphy *wiphy)
  73 {
  74         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
  75
  76         return rdev->wiphy_idx;
  77 }
  78
  79 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  80 {
  81         struct cfg80211_registered_device *rdev;
  82
  83         ASSERT_RTNL();
  84
  85         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  86         if (!rdev)
  87                 return NULL;
  88         return &rdev->wiphy;
  89 }
  90
  91 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
  92                                    const char *newname)
  93 {
  94         struct cfg80211_registered_device *rdev2;
  95         int wiphy_idx, taken = -1, digits;
  96
  97         ASSERT_RTNL();
  98
  99         if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
 100                 return -EINVAL;
 101
 102         /* prohibit calling the thing phy%d when %d is not its number */
 103         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 104         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 105                 /* count number of places needed to print wiphy_idx */
 106                 digits = 1;
 107                 while (wiphy_idx /= 10)
 108                         digits++;
 109                 /*
 110                  * deny the name if it is phy<idx> where <idx> is printed
 111                  * without leading zeroes. taken == strlen(newname) here
 112                  */
 113                 if (taken == strlen(PHY_NAME) + digits)
 114                         return -EINVAL;
 115         }
 116
 117         /* Ensure another device does not already have this name. */
 118         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 119                 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
 120                         return -EINVAL;
 121
 122         return 0;
 123 }
 124
 125 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 126                         char *newname)
 127 {
 128         int result;
 129
 130         ASSERT_RTNL();
 131
 132         /* Ignore nop renames */
 133         if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
 134                 return 0;
 135
 136         result = cfg80211_dev_check_name(rdev, newname);
 137         if (result < 0)
 138                 return result;
 139
 140         result = device_rename(&rdev->wiphy.dev, newname);
 141         if (result)
 142                 return result;
 143
 144         if (rdev->wiphy.debugfsdir &&
 145             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 146                             rdev->wiphy.debugfsdir,
 147                             rdev->wiphy.debugfsdir->d_parent,
 148                             newname))
 149                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 150
 151         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 152
 153         return 0;
 154 }
 155
 156 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 157                           struct net *net)
 158 {
 159         struct wireless_dev *wdev;
 160         int err = 0;
 161
 162         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 163                 return -EOPNOTSUPP;
 164
 165         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 166                 if (!wdev->netdev)
 167                         continue;
 168                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 169                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 170                 if (err)
 171                         break;
 172                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 173         }
 174
 175         if (err) {
 176                 /* failed -- clean up to old netns */
 177                 net = wiphy_net(&rdev->wiphy);
 178
 179                 list_for_each_entry_continue_reverse(wdev,
 180                                                      &rdev->wiphy.wdev_list,
 181                                                      list) {
 182                         if (!wdev->netdev)
 183                                 continue;
 184                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 185                         err = dev_change_net_namespace(wdev->netdev, net,
 186                                                         "wlan%d");
 187                         WARN_ON(err);
 188                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 189                 }
 190
 191                 return err;
 192         }
 193
 194         wiphy_net_set(&rdev->wiphy, net);
 195
 196         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 197         WARN_ON(err);
 198
 199         return 0;
 200 }
 201
 202 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 203 {
 204         struct cfg80211_registered_device *rdev = data;
 205
 206         rdev_rfkill_poll(rdev);
 207 }
 208
 209 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 210                               struct wireless_dev *wdev)
 211 {
 212         ASSERT_RTNL();
 213
 214         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 215                 return;
 216
 217         if (!wdev_running(wdev))
 218                 return;
 219
 220         rdev_stop_p2p_device(rdev, wdev);
 221         wdev->is_running = false;
 222
 223         rdev->opencount--;
 224
 225         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 226                 if (WARN_ON(!rdev->scan_req->notified))
 227                         rdev->scan_req->info.aborted = true;
 228                 ___cfg80211_scan_done(rdev, false);
 229         }
 230 }
 231
 232 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
 233                        struct wireless_dev *wdev)
 234 {
 235         ASSERT_RTNL();
 236
 237         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
 238                 return;
 239
 240         if (!wdev_running(wdev))
 241                 return;
 242
 243         rdev_stop_nan(rdev, wdev);
 244         wdev->is_running = false;
 245
 246         rdev->opencount--;
 247 }
 248
 249 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 250 {
 251         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 252         struct wireless_dev *wdev;
 253
 254         ASSERT_RTNL();
 255
 256         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 257                 if (wdev->netdev) {
 258                         dev_close(wdev->netdev);
 259                         continue;
 260                 }
 261                 /* otherwise, check iftype */
 262                 switch (wdev->iftype) {
 263                 case NL80211_IFTYPE_P2P_DEVICE:
 264                         cfg80211_stop_p2p_device(rdev, wdev);
 265                         break;
 266                 case NL80211_IFTYPE_NAN:
 267                         cfg80211_stop_nan(rdev, wdev);
 268                         break;
 269                 default:
 270                         break;
 271                 }
 272         }
 273 }
 274 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 275
 276 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 277 {
 278         struct cfg80211_registered_device *rdev = data;
 279
 280         if (!blocked)
 281                 return 0;
 282
 283         rtnl_lock();
 284         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 285         rtnl_unlock();
 286
 287         return 0;
 288 }
 289
 290 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 291 {
 292         struct cfg80211_registered_device *rdev;
 293
 294         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 295         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 296 }
 297
 298 static void cfg80211_event_work(struct work_struct *work)
 299 {
 300         struct cfg80211_registered_device *rdev;
 301
 302         rdev = container_of(work, struct cfg80211_registered_device,
 303                             event_work);
 304
 305         rtnl_lock();
 306         cfg80211_process_rdev_events(rdev);
 307         rtnl_unlock();
 308 }
 309
 310 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 311 {
 312         struct wireless_dev *wdev, *tmp;
 313
 314         ASSERT_RTNL();
 315
 316         list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
 317                 if (wdev->nl_owner_dead)
 318                         rdev_del_virtual_intf(rdev, wdev);
 319         }
 320 }
 321
 322 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 323 {
 324         struct cfg80211_registered_device *rdev;
 325
 326         rdev = container_of(work, struct cfg80211_registered_device,
 327                             destroy_work);
 328
 329         rtnl_lock();
 330         cfg80211_destroy_ifaces(rdev);
 331         rtnl_unlock();
 332 }
 333
 334 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
 335 {
 336         struct cfg80211_registered_device *rdev;
 337         struct cfg80211_sched_scan_request *req, *tmp;
 338
 339         rdev = container_of(work, struct cfg80211_registered_device,
 340                            sched_scan_stop_wk);
 341
 342         rtnl_lock();
 343         list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
 344                 if (req->nl_owner_dead)
 345                         cfg80211_stop_sched_scan_req(rdev, req, false);
 346         }
 347         rtnl_unlock();
 348 }
 349
 350 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
 351 {
 352         struct cfg80211_registered_device *rdev;
 353
 354         rdev = container_of(work, struct cfg80211_registered_device,
 355                             propagate_radar_detect_wk);
 356
 357         rtnl_lock();
 358
 359         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
 360                                        NL80211_DFS_UNAVAILABLE,
 361                                        NL80211_RADAR_DETECTED);
 362
 363         rtnl_unlock();
 364 }
 365
 366 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
 367 {
 368         struct cfg80211_registered_device *rdev;
 369
 370         rdev = container_of(work, struct cfg80211_registered_device,
 371                             propagate_cac_done_wk);
 372
 373         rtnl_lock();
 374
 375         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
 376                                        NL80211_DFS_AVAILABLE,
 377                                        NL80211_RADAR_CAC_FINISHED);
 378
 379         rtnl_unlock();
 380 }
 381
 382 /* exported functions */
 383
 384 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 385                            const char *requested_name)
 386 {
 387         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 388
 389         struct cfg80211_registered_device *rdev;
 390         int alloc_size;
 391
 392         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 393         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 394         WARN_ON(ops->connect && !ops->disconnect);
 395         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 396         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 397         WARN_ON(ops->add_station && !ops->del_station);
 398         WARN_ON(ops->add_mpath && !ops->del_mpath);
 399         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 400         WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
 401         WARN_ON(ops->start_ap && !ops->stop_ap);
 402         WARN_ON(ops->join_ocb && !ops->leave_ocb);
 403         WARN_ON(ops->suspend && !ops->resume);
 404         WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
 405         WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
 406         WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
 407         WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
 408
 409         alloc_size = sizeof(*rdev) + sizeof_priv;
 410
 411         rdev = kzalloc(alloc_size, GFP_KERNEL);
 412         if (!rdev)
 413                 return NULL;
 414
 415         rdev->ops = ops;
 416
 417         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 418
 419         if (unlikely(rdev->wiphy_idx < 0)) {
 420                 /* ugh, wrapped! */
 421                 atomic_dec(&wiphy_counter);
 422                 kfree(rdev);
 423                 return NULL;
 424         }
 425
 426         /* atomic_inc_return makes it start at 1, make it start at 0 */
 427         rdev->wiphy_idx--;
 428
 429         /* give it a proper name */
 430         if (requested_name && requested_name[0]) {
 431                 int rv;
 432
 433                 rtnl_lock();
 434                 rv = cfg80211_dev_check_name(rdev, requested_name);
 435
 436                 if (rv < 0) {
 437                         rtnl_unlock();
 438                         goto use_default_name;
 439                 }
 440
 441                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 442                 rtnl_unlock();
 443                 if (rv)
 444                         goto use_default_name;
 445         } else {
 446                 int rv;
 447
 448 use_default_name:
 449                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 450                  * the restrictions on phy names.  Probably this call could
 451                  * fail if some other part of the kernel (re)named a device
 452                  * phyX.  But, might should add some locking and check return
 453                  * value, and use a different name if this one exists?
 454                  */
 455                 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 456                 if (rv < 0) {
 457                         kfree(rdev);
 458                         return NULL;
 459                 }
 460         }
 461
 462         INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
 463         INIT_LIST_HEAD(&rdev->beacon_registrations);
 464         spin_lock_init(&rdev->beacon_registrations_lock);
 465         spin_lock_init(&rdev->bss_lock);
 466         INIT_LIST_HEAD(&rdev->bss_list);
 467         INIT_LIST_HEAD(&rdev->sched_scan_req_list);
 468         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 469         INIT_LIST_HEAD(&rdev->mlme_unreg);
 470         spin_lock_init(&rdev->mlme_unreg_lock);
 471         INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
 472         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 473                           cfg80211_dfs_channels_update_work);
 474 #ifdef CONFIG_CFG80211_WEXT
 475         rdev->wiphy.wext = &cfg80211_wext_handler;
 476 #endif
 477
 478         device_initialize(&rdev->wiphy.dev);
 479         rdev->wiphy.dev.class = &ieee80211_class;
 480         rdev->wiphy.dev.platform_data = rdev;
 481         device_enable_async_suspend(&rdev->wiphy.dev);
 482
 483         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 484         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 485         INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
 486         INIT_WORK(&rdev->propagate_radar_detect_wk,
 487                   cfg80211_propagate_radar_detect_wk);
 488         INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
 489
 490 #ifdef CONFIG_CFG80211_DEFAULT_PS
 491         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 492 #endif
 493
 494         wiphy_net_set(&rdev->wiphy, &init_net);
 495
 496         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 497         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 498                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 499                                    &rdev->rfkill_ops, rdev);
 500
 501         if (!rdev->rfkill) {
 502                 wiphy_free(&rdev->wiphy);
 503                 return NULL;
 504         }
 505
 506         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 507         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 508         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 509
 510         init_waitqueue_head(&rdev->dev_wait);
 511
 512         /*
 513          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 514          * Fragmentation and RTS threshold are disabled by default with the
 515          * special -1 value.
 516          */
 517         rdev->wiphy.retry_short = 7;
 518         rdev->wiphy.retry_long = 4;
 519         rdev->wiphy.frag_threshold = (u32) -1;
 520         rdev->wiphy.rts_threshold = (u32) -1;
 521         rdev->wiphy.coverage_class = 0;
 522
 523         rdev->wiphy.max_num_csa_counters = 1;
 524
 525         rdev->wiphy.max_sched_scan_plans = 1;
 526         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 527
 528         return &rdev->wiphy;
 529 }
 530 EXPORT_SYMBOL(wiphy_new_nm);
 531
 532 static int wiphy_verify_combinations(struct wiphy *wiphy)
 533 {
 534         const struct ieee80211_iface_combination *c;
 535         int i, j;
 536
 537         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 538                 u32 cnt = 0;
 539                 u16 all_iftypes = 0;
 540
 541                 c = &wiphy->iface_combinations[i];
 542
 543                 /*
 544                  * Combinations with just one interface aren't real,
 545                  * however we make an exception for DFS.
 546                  */
 547                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 548                         return -EINVAL;
 549
 550                 /* Need at least one channel */
 551                 if (WARN_ON(!c->num_different_channels))
 552                         return -EINVAL;
 553
 554                 /*
 555                  * Put a sane limit on maximum number of different
 556                  * channels to simplify channel accounting code.
 557                  */
 558                 if (WARN_ON(c->num_different_channels >
 559                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 560                         return -EINVAL;
 561
 562                 /* DFS only works on one channel. */
 563                 if (WARN_ON(c->radar_detect_widths &&
 564                             (c->num_different_channels > 1)))
 565                         return -EINVAL;
 566
 567                 if (WARN_ON(!c->n_limits))
 568                         return -EINVAL;
 569
 570                 for (j = 0; j < c->n_limits; j++) {
 571                         u16 types = c->limits[j].types;
 572
 573                         /* interface types shouldn't overlap */
 574                         if (WARN_ON(types & all_iftypes))
 575                                 return -EINVAL;
 576                         all_iftypes |= types;
 577
 578                         if (WARN_ON(!c->limits[j].max))
 579                                 return -EINVAL;
 580
 581                         /* Shouldn't list software iftypes in combinations! */
 582                         if (WARN_ON(wiphy->software_iftypes & types))
 583                                 return -EINVAL;
 584
 585                         /* Only a single P2P_DEVICE can be allowed */
 586                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 587                                     c->limits[j].max > 1))
 588                                 return -EINVAL;
 589
 590                         /* Only a single NAN can be allowed */
 591                         if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
 592                                     c->limits[j].max > 1))
 593                                 return -EINVAL;
 594
 595                         /*
 596                          * This isn't well-defined right now. If you have an
 597                          * IBSS interface, then its beacon interval may change
 598                          * by joining other networks, and nothing prevents it
 599                          * from doing that.
 600                          * So technically we probably shouldn't even allow AP
 601                          * and IBSS in the same interface, but it seems that
 602                          * some drivers support that, possibly only with fixed
 603                          * beacon intervals for IBSS.
 604                          */
 605                         if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
 606                                     c->beacon_int_min_gcd)) {
 607                                 return -EINVAL;
 608                         }
 609
 610                         cnt += c->limits[j].max;
 611                         /*
 612                          * Don't advertise an unsupported type
 613                          * in a combination.
 614                          */
 615                         if (WARN_ON((wiphy->interface_modes & types) != types))
 616                                 return -EINVAL;
 617                 }
 618
 619 #ifndef CONFIG_WIRELESS_WDS
 620                 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
 621                         return -EINVAL;
 622 #endif
 623
 624                 /* You can't even choose that many! */
 625                 if (WARN_ON(cnt < c->max_interfaces))
 626                         return -EINVAL;
 627         }
 628
 629         return 0;
 630 }
 631
 632 int wiphy_register(struct wiphy *wiphy)
 633 {
 634         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 635         int res;
 636         enum nl80211_band band;
 637         struct ieee80211_supported_band *sband;
 638         bool have_band = false;
 639         int i;
 640         u16 ifmodes = wiphy->interface_modes;
 641
 642 #ifdef CONFIG_PM
 643         if (WARN_ON(wiphy->wowlan &&
 644                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 645                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 646                 return -EINVAL;
 647         if (WARN_ON(wiphy->wowlan &&
 648                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 649                     !wiphy->wowlan->tcp))
 650                 return -EINVAL;
 651 #endif
 652         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 653                     (!rdev->ops->tdls_channel_switch ||
 654                      !rdev->ops->tdls_cancel_channel_switch)))
 655                 return -EINVAL;
 656
 657         if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
 658                     (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
 659                      !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
 660                      !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
 661                 return -EINVAL;
 662
 663 #ifndef CONFIG_WIRELESS_WDS
 664         if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
 665                 return -EINVAL;
 666 #endif
 667
 668         /*
 669          * if a wiphy has unsupported modes for regulatory channel enforcement,
 670          * opt-out of enforcement checking
 671          */
 672         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 673                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 674                                        BIT(NL80211_IFTYPE_AP) |
 675                                        BIT(NL80211_IFTYPE_P2P_GO) |
 676                                        BIT(NL80211_IFTYPE_ADHOC) |
 677                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 678                                        BIT(NL80211_IFTYPE_NAN) |
 679                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 680                                        BIT(NL80211_IFTYPE_MONITOR)))
 681                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 682
 683         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 684                     (wiphy->regulatory_flags &
 685                                         (REGULATORY_CUSTOM_REG |
 686                                          REGULATORY_STRICT_REG |
 687                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 688                                          REGULATORY_COUNTRY_IE_IGNORE))))
 689                 return -EINVAL;
 690
 691         if (WARN_ON(wiphy->coalesce &&
 692                     (!wiphy->coalesce->n_rules ||
 693                      !wiphy->coalesce->n_patterns) &&
 694                     (!wiphy->coalesce->pattern_min_len ||
 695                      wiphy->coalesce->pattern_min_len >
 696                         wiphy->coalesce->pattern_max_len)))
 697                 return -EINVAL;
 698
 699         if (WARN_ON(wiphy->ap_sme_capa &&
 700                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 701                 return -EINVAL;
 702
 703         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 704                 return -EINVAL;
 705
 706         if (WARN_ON(wiphy->addresses &&
 707                     !is_zero_ether_addr(wiphy->perm_addr) &&
 708                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 709                            ETH_ALEN)))
 710                 return -EINVAL;
 711
 712         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 713                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 714                      !rdev->ops->set_mac_acl)))
 715                 return -EINVAL;
 716
 717         /* assure only valid behaviours are flagged by driver
 718          * hence subtract 2 as bit 0 is invalid.
 719          */
 720         if (WARN_ON(wiphy->bss_select_support &&
 721                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 722                 return -EINVAL;
 723
 724         if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
 725                                             NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
 726                     (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
 727                 return -EINVAL;
 728
 729         if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
 730                     rdev->ops->update_connect_params))
 731                 return -EINVAL;
 732
 733         if (wiphy->addresses)
 734                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 735
 736         /* sanity check ifmodes */
 737         WARN_ON(!ifmodes);
 738         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 739         if (WARN_ON(ifmodes != wiphy->interface_modes))
 740                 wiphy->interface_modes = ifmodes;
 741
 742         res = wiphy_verify_combinations(wiphy);
 743         if (res)
 744                 return res;
 745
 746         /* sanity check supported bands/channels */
 747         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 748                 u16 types = 0;
 749
 750                 sband = wiphy->bands[band];
 751                 if (!sband)
 752                         continue;
 753
 754                 sband->band = band;
 755                 if (WARN_ON(!sband->n_channels))
 756                         return -EINVAL;
 757                 /*
 758                  * on 60GHz band, there are no legacy rates, so
 759                  * n_bitrates is 0
 760                  */
 761                 if (WARN_ON(band != NL80211_BAND_60GHZ &&
 762                             !sband->n_bitrates))
 763                         return -EINVAL;
 764
 765                 /*
 766                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 767                  * modify the sband's ht data even if the driver uses a
 768                  * global structure for that.
 769                  */
 770                 if (cfg80211_disable_40mhz_24ghz &&
 771                     band == NL80211_BAND_2GHZ &&
 772                     sband->ht_cap.ht_supported) {
 773                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 774                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 775                 }
 776
 777                 /*
 778                  * Since we use a u32 for rate bitmaps in
 779                  * ieee80211_get_response_rate, we cannot
 780                  * have more than 32 legacy rates.
 781                  */
 782                 if (WARN_ON(sband->n_bitrates > 32))
 783                         return -EINVAL;
 784
 785                 for (i = 0; i < sband->n_channels; i++) {
 786                         sband->channels[i].orig_flags =
 787                                 sband->channels[i].flags;
 788                         sband->channels[i].orig_mag = INT_MAX;
 789                         sband->channels[i].orig_mpwr =
 790                                 sband->channels[i].max_power;
 791                         sband->channels[i].band = band;
 792                 }
 793
 794                 for (i = 0; i < sband->n_iftype_data; i++) {
 795                         const struct ieee80211_sband_iftype_data *iftd;
 796
 797                         iftd = &sband->iftype_data[i];
 798
 799                         if (WARN_ON(!iftd->types_mask))
 800                                 return -EINVAL;
 801                         if (WARN_ON(types & iftd->types_mask))
 802                                 return -EINVAL;
 803
 804                         /* at least one piece of information must be present */
 805                         if (WARN_ON(!iftd->he_cap.has_he))
 806                                 return -EINVAL;
 807
 808                         types |= iftd->types_mask;
 809                 }
 810
 811                 have_band = true;
 812         }
 813
 814         if (!have_band) {
 815                 WARN_ON(1);
 816                 return -EINVAL;
 817         }
 818
 819 #ifdef CONFIG_PM
 820         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 821                     (!rdev->wiphy.wowlan->pattern_min_len ||
 822                      rdev->wiphy.wowlan->pattern_min_len >
 823                                 rdev->wiphy.wowlan->pattern_max_len)))
 824                 return -EINVAL;
 825 #endif
 826
 827         /* check and set up bitrates */
 828         ieee80211_set_bitrate_flags(wiphy);
 829
 830         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 831
 832         rtnl_lock();
 833         res = device_add(&rdev->wiphy.dev);
 834         if (res) {
 835                 rtnl_unlock();
 836                 return res;
 837         }
 838
 839         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 840         cfg80211_rdev_list_generation++;
 841
 842         /* add to debugfs */
 843         rdev->wiphy.debugfsdir =
 844                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 845                                    ieee80211_debugfs_dir);
 846         if (IS_ERR(rdev->wiphy.debugfsdir))
 847                 rdev->wiphy.debugfsdir = NULL;
 848
 849         cfg80211_debugfs_rdev_add(rdev);
 850         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 851
 852         /* set up regulatory info */
 853         wiphy_regulatory_register(wiphy);
 854
 855         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 856                 struct regulatory_request request;
 857
 858                 request.wiphy_idx = get_wiphy_idx(wiphy);
 859                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 860                 request.alpha2[0] = '9';
 861                 request.alpha2[1] = '9';
 862
 863                 nl80211_send_reg_change_event(&request);
 864         }
 865
 866         /* Check that nobody globally advertises any capabilities they do not
 867          * advertise on all possible interface types.
 868          */
 869         if (wiphy->extended_capabilities_len &&
 870             wiphy->num_iftype_ext_capab &&
 871             wiphy->iftype_ext_capab) {
 872                 u8 supported_on_all, j;
 873                 const struct wiphy_iftype_ext_capab *capab;
 874
 875                 capab = wiphy->iftype_ext_capab;
 876                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
 877                         if (capab[0].extended_capabilities_len > j)
 878                                 supported_on_all =
 879                                         capab[0].extended_capabilities[j];
 880                         else
 881                                 supported_on_all = 0x00;
 882                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
 883                                 if (j >= capab[i].extended_capabilities_len) {
 884                                         supported_on_all = 0x00;
 885                                         break;
 886                                 }
 887                                 supported_on_all &=
 888                                         capab[i].extended_capabilities[j];
 889                         }
 890                         if (WARN_ON(wiphy->extended_capabilities[j] &
 891                                     ~supported_on_all))
 892                                 break;
 893                 }
 894         }
 895
 896         rdev->wiphy.registered = true;
 897         rtnl_unlock();
 898
 899         res = rfkill_register(rdev->rfkill);
 900         if (res) {
 901                 rfkill_destroy(rdev->rfkill);
 902                 rdev->rfkill = NULL;
 903                 wiphy_unregister(&rdev->wiphy);
 904                 return res;
 905         }
 906
 907         return 0;
 908 }
 909 EXPORT_SYMBOL(wiphy_register);
 910
 911 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 912 {
 913         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 914
 915         if (!rdev->ops->rfkill_poll)
 916                 return;
 917         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 918         rfkill_resume_polling(rdev->rfkill);
 919 }
 920 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 921
 922 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 923 {
 924         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 925
 926         rfkill_pause_polling(rdev->rfkill);
 927 }
 928 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 929
 930 void wiphy_unregister(struct wiphy *wiphy)
 931 {
 932         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 933
 934         wait_event(rdev->dev_wait, ({
 935                 int __count;
 936                 rtnl_lock();
 937                 __count = rdev->opencount;
 938                 rtnl_unlock();
 939                 __count == 0; }));
 940
 941         if (rdev->rfkill)
 942                 rfkill_unregister(rdev->rfkill);
 943
 944         rtnl_lock();
 945         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 946         rdev->wiphy.registered = false;
 947
 948         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
 949
 950         /*
 951          * First remove the hardware from everywhere, this makes
 952          * it impossible to find from userspace.
 953          */
 954         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 955         list_del_rcu(&rdev->list);
 956         synchronize_rcu();
 957
 958         /*
 959          * If this device got a regulatory hint tell core its
 960          * free to listen now to a new shiny device regulatory hint
 961          */
 962         wiphy_regulatory_deregister(wiphy);
 963
 964         cfg80211_rdev_list_generation++;
 965         device_del(&rdev->wiphy.dev);
 966
 967         rtnl_unlock();
 968
 969         flush_work(&rdev->scan_done_wk);
 970         cancel_work_sync(&rdev->conn_work);
 971         flush_work(&rdev->event_work);
 972         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 973         flush_work(&rdev->destroy_work);
 974         flush_work(&rdev->sched_scan_stop_wk);
 975         flush_work(&rdev->mlme_unreg_wk);
 976         flush_work(&rdev->propagate_radar_detect_wk);
 977         flush_work(&rdev->propagate_cac_done_wk);
 978
 979 #ifdef CONFIG_PM
 980         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
 981                 rdev_set_wakeup(rdev, false);
 982 #endif
 983         cfg80211_rdev_free_wowlan(rdev);
 984         cfg80211_rdev_free_coalesce(rdev);
 985 }
 986 EXPORT_SYMBOL(wiphy_unregister);
 987
 988 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 989 {
 990         struct cfg80211_internal_bss *scan, *tmp;
 991         struct cfg80211_beacon_registration *reg, *treg;
 992         rfkill_destroy(rdev->rfkill);
 993         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 994                 list_del(&reg->list);
 995                 kfree(reg);
 996         }
 997         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 998                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 999         kfree(rdev);
1000 }
1001
1002 void wiphy_free(struct wiphy *wiphy)
1003 {
1004         put_device(&wiphy->dev);
1005 }
1006 EXPORT_SYMBOL(wiphy_free);
1007
1008 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
1009 {
1010         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1011
1012         if (rfkill_set_hw_state(rdev->rfkill, blocked))
1013                 schedule_work(&rdev->rfkill_sync);
1014 }
1015 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
1016
1017 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1018 {
1019         kfree(wdev->cqm_config);
1020         wdev->cqm_config = NULL;
1021 }
1022
1023 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1024 {
1025         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1026
1027         ASSERT_RTNL();
1028
1029         if (WARN_ON(wdev->netdev))
1030                 return;
1031
1032         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1033
1034         list_del_rcu(&wdev->list);
1035         synchronize_rcu();
1036         rdev->devlist_generation++;
1037
1038         switch (wdev->iftype) {
1039         case NL80211_IFTYPE_P2P_DEVICE:
1040                 cfg80211_mlme_purge_registrations(wdev);
1041                 cfg80211_stop_p2p_device(rdev, wdev);
1042                 break;
1043         case NL80211_IFTYPE_NAN:
1044                 cfg80211_stop_nan(rdev, wdev);
1045                 break;
1046         default:
1047                 WARN_ON_ONCE(1);
1048                 break;
1049         }
1050
1051         cfg80211_cqm_config_free(wdev);
1052 }
1053 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1054
1055 static const struct device_type wiphy_type = {
1056         .name   = "wlan",
1057 };
1058
1059 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1060                                enum nl80211_iftype iftype, int num)
1061 {
1062         ASSERT_RTNL();
1063
1064         rdev->num_running_ifaces += num;
1065         if (iftype == NL80211_IFTYPE_MONITOR)
1066                 rdev->num_running_monitor_ifaces += num;
1067 }
1068
1069 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1070                       struct wireless_dev *wdev)
1071 {
1072         struct net_device *dev = wdev->netdev;
1073         struct cfg80211_sched_scan_request *pos, *tmp;
1074
1075         ASSERT_RTNL();
1076         ASSERT_WDEV_LOCK(wdev);
1077
1078         switch (wdev->iftype) {
1079         case NL80211_IFTYPE_ADHOC:
1080                 __cfg80211_leave_ibss(rdev, dev, true);
1081                 break;
1082         case NL80211_IFTYPE_P2P_CLIENT:
1083         case NL80211_IFTYPE_STATION:
1084                 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1085                                          list) {
1086                         if (dev == pos->dev)
1087                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1088                 }
1089
1090 #ifdef CONFIG_CFG80211_WEXT
1091                 kfree(wdev->wext.ie);
1092                 wdev->wext.ie = NULL;
1093                 wdev->wext.ie_len = 0;
1094                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1095 #endif
1096                 cfg80211_disconnect(rdev, dev,
1097                                     WLAN_REASON_DEAUTH_LEAVING, true);
1098                 break;
1099         case NL80211_IFTYPE_MESH_POINT:
1100                 __cfg80211_leave_mesh(rdev, dev);
1101                 break;
1102         case NL80211_IFTYPE_AP:
1103         case NL80211_IFTYPE_P2P_GO:
1104                 __cfg80211_stop_ap(rdev, dev, true);
1105                 break;
1106         case NL80211_IFTYPE_OCB:
1107                 __cfg80211_leave_ocb(rdev, dev);
1108                 break;
1109         case NL80211_IFTYPE_WDS:
1110                 /* must be handled by mac80211/driver, has no APIs */
1111                 break;
1112         case NL80211_IFTYPE_P2P_DEVICE:
1113         case NL80211_IFTYPE_NAN:
1114                 /* cannot happen, has no netdev */
1115                 break;
1116         case NL80211_IFTYPE_AP_VLAN:
1117         case NL80211_IFTYPE_MONITOR:
1118                 /* nothing to do */
1119                 break;
1120         case NL80211_IFTYPE_UNSPECIFIED:
1121         case NUM_NL80211_IFTYPES:
1122                 /* invalid */
1123                 break;
1124         }
1125 }
1126
1127 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1128                     struct wireless_dev *wdev)
1129 {
1130         wdev_lock(wdev);
1131         __cfg80211_leave(rdev, wdev);
1132         wdev_unlock(wdev);
1133 }
1134
1135 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1136                          gfp_t gfp)
1137 {
1138         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1139         struct cfg80211_event *ev;
1140         unsigned long flags;
1141
1142         trace_cfg80211_stop_iface(wiphy, wdev);
1143
1144         ev = kzalloc(sizeof(*ev), gfp);
1145         if (!ev)
1146                 return;
1147
1148         ev->type = EVENT_STOPPED;
1149
1150         spin_lock_irqsave(&wdev->event_lock, flags);
1151         list_add_tail(&ev->list, &wdev->event_list);
1152         spin_unlock_irqrestore(&wdev->event_lock, flags);
1153         queue_work(cfg80211_wq, &rdev->event_work);
1154 }
1155 EXPORT_SYMBOL(cfg80211_stop_iface);
1156
1157 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1158                                          unsigned long state, void *ptr)
1159 {
1160         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1161         struct wireless_dev *wdev = dev->ieee80211_ptr;
1162         struct cfg80211_registered_device *rdev;
1163         struct cfg80211_sched_scan_request *pos, *tmp;
1164
1165         if (!wdev)
1166                 return NOTIFY_DONE;
1167
1168         rdev = wiphy_to_rdev(wdev->wiphy);
1169
1170         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1171
1172         switch (state) {
1173         case NETDEV_POST_INIT:
1174                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1175                 break;
1176         case NETDEV_REGISTER:
1177                 /*
1178                  * NB: cannot take rdev->mtx here because this may be
1179                  * called within code protected by it when interfaces
1180                  * are added with nl80211.
1181                  */
1182                 mutex_init(&wdev->mtx);
1183                 INIT_LIST_HEAD(&wdev->event_list);
1184                 spin_lock_init(&wdev->event_lock);
1185                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1186                 spin_lock_init(&wdev->mgmt_registrations_lock);
1187
1188                 /*
1189                  * We get here also when the interface changes network namespaces,
1190                  * as it's registered into the new one, but we don't want it to
1191                  * change ID in that case. Checking if the ID is already assigned
1192                  * works, because 0 isn't considered a valid ID and the memory is
1193                  * 0-initialized.
1194                  */
1195                 if (!wdev->identifier)
1196                         wdev->identifier = ++rdev->wdev_id;
1197                 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1198                 rdev->devlist_generation++;
1199                 /* can only change netns with wiphy */
1200                 dev->features |= NETIF_F_NETNS_LOCAL;
1201
1202                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1203                                       "phy80211")) {
1204                         pr_err("failed to add phy80211 symlink to netdev!\n");
1205                 }
1206                 wdev->netdev = dev;
1207 #ifdef CONFIG_CFG80211_WEXT
1208                 wdev->wext.default_key = -1;
1209                 wdev->wext.default_mgmt_key = -1;
1210                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1211 #endif
1212
1213                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1214                         wdev->ps = true;
1215                 else
1216                         wdev->ps = false;
1217                 /* allow mac80211 to determine the timeout */
1218                 wdev->ps_timeout = -1;
1219
1220                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1221                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1222                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1223                         dev->priv_flags |= IFF_DONT_BRIDGE;
1224
1225                 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1226
1227                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1228                 break;
1229         case NETDEV_GOING_DOWN:
1230                 cfg80211_leave(rdev, wdev);
1231                 break;
1232         case NETDEV_DOWN:
1233                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1234                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1235                         if (WARN_ON(!rdev->scan_req->notified))
1236                                 rdev->scan_req->info.aborted = true;
1237                         ___cfg80211_scan_done(rdev, false);
1238                 }
1239
1240                 list_for_each_entry_safe(pos, tmp,
1241                                          &rdev->sched_scan_req_list, list) {
1242                         if (WARN_ON(pos && pos->dev == wdev->netdev))
1243                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1244                 }
1245
1246                 rdev->opencount--;
1247                 wake_up(&rdev->dev_wait);
1248                 break;
1249         case NETDEV_UP:
1250                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1251                 wdev_lock(wdev);
1252                 switch (wdev->iftype) {
1253 #ifdef CONFIG_CFG80211_WEXT
1254                 case NL80211_IFTYPE_ADHOC:
1255                         cfg80211_ibss_wext_join(rdev, wdev);
1256                         break;
1257                 case NL80211_IFTYPE_STATION:
1258                         cfg80211_mgd_wext_connect(rdev, wdev);
1259                         break;
1260 #endif
1261 #ifdef CONFIG_MAC80211_MESH
1262                 case NL80211_IFTYPE_MESH_POINT:
1263                         {
1264                                 /* backward compat code... */
1265                                 struct mesh_setup setup;
1266                                 memcpy(&setup, &default_mesh_setup,
1267                                                 sizeof(setup));
1268                                  /* back compat only needed for mesh_id */
1269                                 setup.mesh_id = wdev->ssid;
1270                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1271                                 if (wdev->mesh_id_up_len)
1272                                         __cfg80211_join_mesh(rdev, dev,
1273                                                         &setup,
1274                                                         &default_mesh_config);
1275                                 break;
1276                         }
1277 #endif
1278                 default:
1279                         break;
1280                 }
1281                 wdev_unlock(wdev);
1282                 rdev->opencount++;
1283
1284                 /*
1285                  * Configure power management to the driver here so that its
1286                  * correctly set also after interface type changes etc.
1287                  */
1288                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1289                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1290                     rdev->ops->set_power_mgmt &&
1291                     rdev_set_power_mgmt(rdev, dev, wdev->ps,
1292                                         wdev->ps_timeout)) {
1293                         /* assume this means it's off */
1294                         wdev->ps = false;
1295                 }
1296                 break;
1297         case NETDEV_UNREGISTER:
1298                 /*
1299                  * It is possible to get NETDEV_UNREGISTER
1300                  * multiple times. To detect that, check
1301                  * that the interface is still on the list
1302                  * of registered interfaces, and only then
1303                  * remove and clean it up.
1304                  */
1305                 if (!list_empty(&wdev->list)) {
1306                         nl80211_notify_iface(rdev, wdev,
1307                                              NL80211_CMD_DEL_INTERFACE);
1308                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1309                         list_del_rcu(&wdev->list);
1310                         rdev->devlist_generation++;
1311                         cfg80211_mlme_purge_registrations(wdev);
1312 #ifdef CONFIG_CFG80211_WEXT
1313                         kzfree(wdev->wext.keys);
1314 #endif
1315                         flush_work(&wdev->disconnect_wk);
1316                         cfg80211_cqm_config_free(wdev);
1317                 }
1318                 /*
1319                  * synchronise (so that we won't find this netdev
1320                  * from other code any more) and then clear the list
1321                  * head so that the above code can safely check for
1322                  * !list_empty() to avoid double-cleanup.
1323                  */
1324                 synchronize_rcu();
1325                 INIT_LIST_HEAD(&wdev->list);
1326                 /*
1327                  * Ensure that all events have been processed and
1328                  * freed.
1329                  */
1330                 cfg80211_process_wdev_events(wdev);
1331
1332                 if (WARN_ON(wdev->current_bss)) {
1333                         cfg80211_unhold_bss(wdev->current_bss);
1334                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1335                         wdev->current_bss = NULL;
1336                 }
1337                 break;
1338         case NETDEV_PRE_UP:
1339                 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1340                                              wdev->use_4addr, 0))
1341                         return notifier_from_errno(-EOPNOTSUPP);
1342
1343                 if (rfkill_blocked(rdev->rfkill))
1344                         return notifier_from_errno(-ERFKILL);
1345                 break;
1346         default:
1347                 return NOTIFY_DONE;
1348         }
1349
1350         wireless_nlevent_flush();
1351
1352         return NOTIFY_OK;
1353 }
1354
1355 static struct notifier_block cfg80211_netdev_notifier = {
1356         .notifier_call = cfg80211_netdev_notifier_call,
1357 };
1358
1359 static void __net_exit cfg80211_pernet_exit(struct net *net)
1360 {
1361         struct cfg80211_registered_device *rdev;
1362
1363         rtnl_lock();
1364         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1365                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1366                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1367         }
1368         rtnl_unlock();
1369 }
1370
1371 static struct pernet_operations cfg80211_pernet_ops = {
1372         .exit = cfg80211_pernet_exit,
1373 };
1374
1375 static int __init cfg80211_init(void)
1376 {
1377         int err;
1378
1379         err = register_pernet_device(&cfg80211_pernet_ops);
1380         if (err)
1381                 goto out_fail_pernet;
1382
1383         err = wiphy_sysfs_init();
1384         if (err)
1385                 goto out_fail_sysfs;
1386
1387         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1388         if (err)
1389                 goto out_fail_notifier;
1390
1391         err = nl80211_init();
1392         if (err)
1393                 goto out_fail_nl80211;
1394
1395         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1396
1397         err = regulatory_init();
1398         if (err)
1399                 goto out_fail_reg;
1400
1401         cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1402         if (!cfg80211_wq) {
1403                 err = -ENOMEM;
1404                 goto out_fail_wq;
1405         }
1406
1407         return 0;
1408
1409 out_fail_wq:
1410         regulatory_exit();
1411 out_fail_reg:
1412         debugfs_remove(ieee80211_debugfs_dir);
1413         nl80211_exit();
1414 out_fail_nl80211:
1415         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1416 out_fail_notifier:
1417         wiphy_sysfs_exit();
1418 out_fail_sysfs:
1419         unregister_pernet_device(&cfg80211_pernet_ops);
1420 out_fail_pernet:
1421         return err;
1422 }
1423 fs_initcall(cfg80211_init);
1424
1425 static void __exit cfg80211_exit(void)
1426 {
1427         debugfs_remove(ieee80211_debugfs_dir);
1428         nl80211_exit();
1429         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1430         wiphy_sysfs_exit();
1431         regulatory_exit();
1432         unregister_pernet_device(&cfg80211_pernet_ops);
1433         destroy_workqueue(cfg80211_wq);
1434 }
1435 module_exit(cfg80211_exit);