net/wireless/core.c

   1 /*
   2  * This is the linux wireless configuration interface.
   3  *
   4  * Copyright 2006-2010          Johannes Berg <johannes@sipsolutions.net>
   5  * Copyright 2013-2014  Intel Mobile Communications GmbH
   6  * Copyright 2015       Intel Deutschland GmbH
   7  */
   8
   9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  10
  11 #include <linux/if.h>
  12 #include <linux/module.h>
  13 #include <linux/err.h>
  14 #include <linux/list.h>
  15 #include <linux/slab.h>
  16 #include <linux/nl80211.h>
  17 #include <linux/debugfs.h>
  18 #include <linux/notifier.h>
  19 #include <linux/device.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/sched.h>
  23 #include <net/genetlink.h>
  24 #include <net/cfg80211.h>
  25 #include "nl80211.h"
  26 #include "core.h"
  27 #include "sysfs.h"
  28 #include "debugfs.h"
  29 #include "wext-compat.h"
  30 #include "rdev-ops.h"
  31
  32 /* name for sysfs, %d is appended */
  33 #define PHY_NAME "phy"
  34
  35 MODULE_AUTHOR("Johannes Berg");
  36 MODULE_LICENSE("GPL");
  37 MODULE_DESCRIPTION("wireless configuration support");
  38 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
  39
  40 /* RCU-protected (and RTNL for writers) */
  41 LIST_HEAD(cfg80211_rdev_list);
  42 int cfg80211_rdev_list_generation;
  43
  44 /* for debugfs */
  45 static struct dentry *ieee80211_debugfs_dir;
  46
  47 /* for the cleanup, scan and event works */
  48 struct workqueue_struct *cfg80211_wq;
  49
  50 static bool cfg80211_disable_40mhz_24ghz;
  51 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  52 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  53                  "Disable 40MHz support in the 2.4GHz band");
  54
  55 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  56 {
  57         struct cfg80211_registered_device *result = NULL, *rdev;
  58
  59         ASSERT_RTNL();
  60
  61         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  62                 if (rdev->wiphy_idx == wiphy_idx) {
  63                         result = rdev;
  64                         break;
  65                 }
  66         }
  67
  68         return result;
  69 }
  70
  71 int get_wiphy_idx(struct wiphy *wiphy)
  72 {
  73         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
  74
  75         return rdev->wiphy_idx;
  76 }
  77
  78 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  79 {
  80         struct cfg80211_registered_device *rdev;
  81
  82         ASSERT_RTNL();
  83
  84         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  85         if (!rdev)
  86                 return NULL;
  87         return &rdev->wiphy;
  88 }
  89
  90 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
  91                                    const char *newname)
  92 {
  93         struct cfg80211_registered_device *rdev2;
  94         int wiphy_idx, taken = -1, digits;
  95
  96         ASSERT_RTNL();
  97
  98         /* prohibit calling the thing phy%d when %d is not its number */
  99         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 100         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 101                 /* count number of places needed to print wiphy_idx */
 102                 digits = 1;
 103                 while (wiphy_idx /= 10)
 104                         digits++;
 105                 /*
 106                  * deny the name if it is phy<idx> where <idx> is printed
 107                  * without leading zeroes. taken == strlen(newname) here
 108                  */
 109                 if (taken == strlen(PHY_NAME) + digits)
 110                         return -EINVAL;
 111         }
 112
 113         /* Ensure another device does not already have this name. */
 114         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 115                 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
 116                         return -EINVAL;
 117
 118         return 0;
 119 }
 120
 121 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 122                         char *newname)
 123 {
 124         int result;
 125
 126         ASSERT_RTNL();
 127
 128         /* Ignore nop renames */
 129         if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
 130                 return 0;
 131
 132         result = cfg80211_dev_check_name(rdev, newname);
 133         if (result < 0)
 134                 return result;
 135
 136         result = device_rename(&rdev->wiphy.dev, newname);
 137         if (result)
 138                 return result;
 139
 140         if (rdev->wiphy.debugfsdir &&
 141             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 142                             rdev->wiphy.debugfsdir,
 143                             rdev->wiphy.debugfsdir->d_parent,
 144                             newname))
 145                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 146
 147         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 148
 149         return 0;
 150 }
 151
 152 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 153                           struct net *net)
 154 {
 155         struct wireless_dev *wdev;
 156         int err = 0;
 157
 158         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 159                 return -EOPNOTSUPP;
 160
 161         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 162                 if (!wdev->netdev)
 163                         continue;
 164                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 165                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 166                 if (err)
 167                         break;
 168                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 169         }
 170
 171         if (err) {
 172                 /* failed -- clean up to old netns */
 173                 net = wiphy_net(&rdev->wiphy);
 174
 175                 list_for_each_entry_continue_reverse(wdev,
 176                                                      &rdev->wiphy.wdev_list,
 177                                                      list) {
 178                         if (!wdev->netdev)
 179                                 continue;
 180                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 181                         err = dev_change_net_namespace(wdev->netdev, net,
 182                                                         "wlan%d");
 183                         WARN_ON(err);
 184                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 185                 }
 186
 187                 return err;
 188         }
 189
 190         wiphy_net_set(&rdev->wiphy, net);
 191
 192         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 193         WARN_ON(err);
 194
 195         return 0;
 196 }
 197
 198 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 199 {
 200         struct cfg80211_registered_device *rdev = data;
 201
 202         rdev_rfkill_poll(rdev);
 203 }
 204
 205 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 206                               struct wireless_dev *wdev)
 207 {
 208         ASSERT_RTNL();
 209
 210         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 211                 return;
 212
 213         if (!wdev_running(wdev))
 214                 return;
 215
 216         rdev_stop_p2p_device(rdev, wdev);
 217         wdev->is_running = false;
 218
 219         rdev->opencount--;
 220
 221         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 222                 if (WARN_ON(!rdev->scan_req->notified))
 223                         rdev->scan_req->info.aborted = true;
 224                 ___cfg80211_scan_done(rdev, false);
 225         }
 226 }
 227
 228 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
 229                        struct wireless_dev *wdev)
 230 {
 231         ASSERT_RTNL();
 232
 233         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
 234                 return;
 235
 236         if (!wdev_running(wdev))
 237                 return;
 238
 239         rdev_stop_nan(rdev, wdev);
 240         wdev->is_running = false;
 241
 242         rdev->opencount--;
 243 }
 244
 245 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 246 {
 247         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 248         struct wireless_dev *wdev;
 249
 250         ASSERT_RTNL();
 251
 252         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 253                 if (wdev->netdev) {
 254                         dev_close(wdev->netdev);
 255                         continue;
 256                 }
 257                 /* otherwise, check iftype */
 258                 switch (wdev->iftype) {
 259                 case NL80211_IFTYPE_P2P_DEVICE:
 260                         cfg80211_stop_p2p_device(rdev, wdev);
 261                         break;
 262                 case NL80211_IFTYPE_NAN:
 263                         cfg80211_stop_nan(rdev, wdev);
 264                         break;
 265                 default:
 266                         break;
 267                 }
 268         }
 269 }
 270 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 271
 272 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 273 {
 274         struct cfg80211_registered_device *rdev = data;
 275
 276         if (!blocked)
 277                 return 0;
 278
 279         rtnl_lock();
 280         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 281         rtnl_unlock();
 282
 283         return 0;
 284 }
 285
 286 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 287 {
 288         struct cfg80211_registered_device *rdev;
 289
 290         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 291         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 292 }
 293
 294 static void cfg80211_event_work(struct work_struct *work)
 295 {
 296         struct cfg80211_registered_device *rdev;
 297
 298         rdev = container_of(work, struct cfg80211_registered_device,
 299                             event_work);
 300
 301         rtnl_lock();
 302         cfg80211_process_rdev_events(rdev);
 303         rtnl_unlock();
 304 }
 305
 306 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 307 {
 308         struct wireless_dev *wdev, *tmp;
 309
 310         ASSERT_RTNL();
 311
 312         list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
 313                 if (wdev->nl_owner_dead)
 314                         rdev_del_virtual_intf(rdev, wdev);
 315         }
 316 }
 317
 318 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 319 {
 320         struct cfg80211_registered_device *rdev;
 321
 322         rdev = container_of(work, struct cfg80211_registered_device,
 323                             destroy_work);
 324
 325         rtnl_lock();
 326         cfg80211_destroy_ifaces(rdev);
 327         rtnl_unlock();
 328 }
 329
 330 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
 331 {
 332         struct cfg80211_registered_device *rdev;
 333         struct cfg80211_sched_scan_request *req, *tmp;
 334
 335         rdev = container_of(work, struct cfg80211_registered_device,
 336                            sched_scan_stop_wk);
 337
 338         rtnl_lock();
 339         list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
 340                 if (req->nl_owner_dead)
 341                         cfg80211_stop_sched_scan_req(rdev, req, false);
 342         }
 343         rtnl_unlock();
 344 }
 345
 346 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
 347 {
 348         struct cfg80211_registered_device *rdev;
 349
 350         rdev = container_of(work, struct cfg80211_registered_device,
 351                             propagate_radar_detect_wk);
 352
 353         rtnl_lock();
 354
 355         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
 356                                        NL80211_DFS_UNAVAILABLE,
 357                                        NL80211_RADAR_DETECTED);
 358
 359         rtnl_unlock();
 360 }
 361
 362 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
 363 {
 364         struct cfg80211_registered_device *rdev;
 365
 366         rdev = container_of(work, struct cfg80211_registered_device,
 367                             propagate_cac_done_wk);
 368
 369         rtnl_lock();
 370
 371         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
 372                                        NL80211_DFS_AVAILABLE,
 373                                        NL80211_RADAR_CAC_FINISHED);
 374
 375         rtnl_unlock();
 376 }
 377
 378 /* exported functions */
 379
 380 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 381                            const char *requested_name)
 382 {
 383         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 384
 385         struct cfg80211_registered_device *rdev;
 386         int alloc_size;
 387
 388         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 389         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 390         WARN_ON(ops->connect && !ops->disconnect);
 391         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 392         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 393         WARN_ON(ops->add_station && !ops->del_station);
 394         WARN_ON(ops->add_mpath && !ops->del_mpath);
 395         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 396         WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
 397         WARN_ON(ops->start_ap && !ops->stop_ap);
 398         WARN_ON(ops->join_ocb && !ops->leave_ocb);
 399         WARN_ON(ops->suspend && !ops->resume);
 400         WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
 401         WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
 402         WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
 403         WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
 404
 405         alloc_size = sizeof(*rdev) + sizeof_priv;
 406
 407         rdev = kzalloc(alloc_size, GFP_KERNEL);
 408         if (!rdev)
 409                 return NULL;
 410
 411         rdev->ops = ops;
 412
 413         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 414
 415         if (unlikely(rdev->wiphy_idx < 0)) {
 416                 /* ugh, wrapped! */
 417                 atomic_dec(&wiphy_counter);
 418                 kfree(rdev);
 419                 return NULL;
 420         }
 421
 422         /* atomic_inc_return makes it start at 1, make it start at 0 */
 423         rdev->wiphy_idx--;
 424
 425         /* give it a proper name */
 426         if (requested_name && requested_name[0]) {
 427                 int rv;
 428
 429                 rtnl_lock();
 430                 rv = cfg80211_dev_check_name(rdev, requested_name);
 431
 432                 if (rv < 0) {
 433                         rtnl_unlock();
 434                         goto use_default_name;
 435                 }
 436
 437                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 438                 rtnl_unlock();
 439                 if (rv)
 440                         goto use_default_name;
 441         } else {
 442                 int rv;
 443
 444 use_default_name:
 445                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 446                  * the restrictions on phy names.  Probably this call could
 447                  * fail if some other part of the kernel (re)named a device
 448                  * phyX.  But, might should add some locking and check return
 449                  * value, and use a different name if this one exists?
 450                  */
 451                 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 452                 if (rv < 0) {
 453                         kfree(rdev);
 454                         return NULL;
 455                 }
 456         }
 457
 458         INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
 459         INIT_LIST_HEAD(&rdev->beacon_registrations);
 460         spin_lock_init(&rdev->beacon_registrations_lock);
 461         spin_lock_init(&rdev->bss_lock);
 462         INIT_LIST_HEAD(&rdev->bss_list);
 463         INIT_LIST_HEAD(&rdev->sched_scan_req_list);
 464         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 465         INIT_LIST_HEAD(&rdev->mlme_unreg);
 466         spin_lock_init(&rdev->mlme_unreg_lock);
 467         INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
 468         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 469                           cfg80211_dfs_channels_update_work);
 470 #ifdef CONFIG_CFG80211_WEXT
 471         rdev->wiphy.wext = &cfg80211_wext_handler;
 472 #endif
 473
 474         device_initialize(&rdev->wiphy.dev);
 475         rdev->wiphy.dev.class = &ieee80211_class;
 476         rdev->wiphy.dev.platform_data = rdev;
 477         device_enable_async_suspend(&rdev->wiphy.dev);
 478
 479         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 480         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 481         INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
 482         INIT_WORK(&rdev->propagate_radar_detect_wk,
 483                   cfg80211_propagate_radar_detect_wk);
 484         INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
 485
 486 #ifdef CONFIG_CFG80211_DEFAULT_PS
 487         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 488 #endif
 489
 490         wiphy_net_set(&rdev->wiphy, &init_net);
 491
 492         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 493         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 494                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 495                                    &rdev->rfkill_ops, rdev);
 496
 497         if (!rdev->rfkill) {
 498                 kfree(rdev);
 499                 return NULL;
 500         }
 501
 502         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 503         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 504         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 505
 506         init_waitqueue_head(&rdev->dev_wait);
 507
 508         /*
 509          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 510          * Fragmentation and RTS threshold are disabled by default with the
 511          * special -1 value.
 512          */
 513         rdev->wiphy.retry_short = 7;
 514         rdev->wiphy.retry_long = 4;
 515         rdev->wiphy.frag_threshold = (u32) -1;
 516         rdev->wiphy.rts_threshold = (u32) -1;
 517         rdev->wiphy.coverage_class = 0;
 518
 519         rdev->wiphy.max_num_csa_counters = 1;
 520
 521         rdev->wiphy.max_sched_scan_plans = 1;
 522         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 523
 524         return &rdev->wiphy;
 525 }
 526 EXPORT_SYMBOL(wiphy_new_nm);
 527
 528 static int wiphy_verify_combinations(struct wiphy *wiphy)
 529 {
 530         const struct ieee80211_iface_combination *c;
 531         int i, j;
 532
 533         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 534                 u32 cnt = 0;
 535                 u16 all_iftypes = 0;
 536
 537                 c = &wiphy->iface_combinations[i];
 538
 539                 /*
 540                  * Combinations with just one interface aren't real,
 541                  * however we make an exception for DFS.
 542                  */
 543                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 544                         return -EINVAL;
 545
 546                 /* Need at least one channel */
 547                 if (WARN_ON(!c->num_different_channels))
 548                         return -EINVAL;
 549
 550                 /*
 551                  * Put a sane limit on maximum number of different
 552                  * channels to simplify channel accounting code.
 553                  */
 554                 if (WARN_ON(c->num_different_channels >
 555                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 556                         return -EINVAL;
 557
 558                 /* DFS only works on one channel. */
 559                 if (WARN_ON(c->radar_detect_widths &&
 560                             (c->num_different_channels > 1)))
 561                         return -EINVAL;
 562
 563                 if (WARN_ON(!c->n_limits))
 564                         return -EINVAL;
 565
 566                 for (j = 0; j < c->n_limits; j++) {
 567                         u16 types = c->limits[j].types;
 568
 569                         /* interface types shouldn't overlap */
 570                         if (WARN_ON(types & all_iftypes))
 571                                 return -EINVAL;
 572                         all_iftypes |= types;
 573
 574                         if (WARN_ON(!c->limits[j].max))
 575                                 return -EINVAL;
 576
 577                         /* Shouldn't list software iftypes in combinations! */
 578                         if (WARN_ON(wiphy->software_iftypes & types))
 579                                 return -EINVAL;
 580
 581                         /* Only a single P2P_DEVICE can be allowed */
 582                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 583                                     c->limits[j].max > 1))
 584                                 return -EINVAL;
 585
 586                         /* Only a single NAN can be allowed */
 587                         if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
 588                                     c->limits[j].max > 1))
 589                                 return -EINVAL;
 590
 591                         /*
 592                          * This isn't well-defined right now. If you have an
 593                          * IBSS interface, then its beacon interval may change
 594                          * by joining other networks, and nothing prevents it
 595                          * from doing that.
 596                          * So technically we probably shouldn't even allow AP
 597                          * and IBSS in the same interface, but it seems that
 598                          * some drivers support that, possibly only with fixed
 599                          * beacon intervals for IBSS.
 600                          */
 601                         if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
 602                                     c->beacon_int_min_gcd)) {
 603                                 return -EINVAL;
 604                         }
 605
 606                         cnt += c->limits[j].max;
 607                         /*
 608                          * Don't advertise an unsupported type
 609                          * in a combination.
 610                          */
 611                         if (WARN_ON((wiphy->interface_modes & types) != types))
 612                                 return -EINVAL;
 613                 }
 614
 615 #ifndef CONFIG_WIRELESS_WDS
 616                 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
 617                         return -EINVAL;
 618 #endif
 619
 620                 /* You can't even choose that many! */
 621                 if (WARN_ON(cnt < c->max_interfaces))
 622                         return -EINVAL;
 623         }
 624
 625         return 0;
 626 }
 627
 628 int wiphy_register(struct wiphy *wiphy)
 629 {
 630         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 631         int res;
 632         enum nl80211_band band;
 633         struct ieee80211_supported_band *sband;
 634         bool have_band = false;
 635         int i;
 636         u16 ifmodes = wiphy->interface_modes;
 637
 638 #ifdef CONFIG_PM
 639         if (WARN_ON(wiphy->wowlan &&
 640                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 641                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 642                 return -EINVAL;
 643         if (WARN_ON(wiphy->wowlan &&
 644                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 645                     !wiphy->wowlan->tcp))
 646                 return -EINVAL;
 647 #endif
 648         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 649                     (!rdev->ops->tdls_channel_switch ||
 650                      !rdev->ops->tdls_cancel_channel_switch)))
 651                 return -EINVAL;
 652
 653         if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
 654                     (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
 655                      !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
 656                      !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
 657                 return -EINVAL;
 658
 659 #ifndef CONFIG_WIRELESS_WDS
 660         if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
 661                 return -EINVAL;
 662 #endif
 663
 664         /*
 665          * if a wiphy has unsupported modes for regulatory channel enforcement,
 666          * opt-out of enforcement checking
 667          */
 668         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 669                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 670                                        BIT(NL80211_IFTYPE_AP) |
 671                                        BIT(NL80211_IFTYPE_P2P_GO) |
 672                                        BIT(NL80211_IFTYPE_ADHOC) |
 673                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 674                                        BIT(NL80211_IFTYPE_NAN) |
 675                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 676                                        BIT(NL80211_IFTYPE_MONITOR)))
 677                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 678
 679         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 680                     (wiphy->regulatory_flags &
 681                                         (REGULATORY_CUSTOM_REG |
 682                                          REGULATORY_STRICT_REG |
 683                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 684                                          REGULATORY_COUNTRY_IE_IGNORE))))
 685                 return -EINVAL;
 686
 687         if (WARN_ON(wiphy->coalesce &&
 688                     (!wiphy->coalesce->n_rules ||
 689                      !wiphy->coalesce->n_patterns) &&
 690                     (!wiphy->coalesce->pattern_min_len ||
 691                      wiphy->coalesce->pattern_min_len >
 692                         wiphy->coalesce->pattern_max_len)))
 693                 return -EINVAL;
 694
 695         if (WARN_ON(wiphy->ap_sme_capa &&
 696                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 697                 return -EINVAL;
 698
 699         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 700                 return -EINVAL;
 701
 702         if (WARN_ON(wiphy->addresses &&
 703                     !is_zero_ether_addr(wiphy->perm_addr) &&
 704                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 705                            ETH_ALEN)))
 706                 return -EINVAL;
 707
 708         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 709                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 710                      !rdev->ops->set_mac_acl)))
 711                 return -EINVAL;
 712
 713         /* assure only valid behaviours are flagged by driver
 714          * hence subtract 2 as bit 0 is invalid.
 715          */
 716         if (WARN_ON(wiphy->bss_select_support &&
 717                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 718                 return -EINVAL;
 719
 720         if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
 721                                             NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
 722                     (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
 723                 return -EINVAL;
 724
 725         if (wiphy->addresses)
 726                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 727
 728         /* sanity check ifmodes */
 729         WARN_ON(!ifmodes);
 730         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 731         if (WARN_ON(ifmodes != wiphy->interface_modes))
 732                 wiphy->interface_modes = ifmodes;
 733
 734         res = wiphy_verify_combinations(wiphy);
 735         if (res)
 736                 return res;
 737
 738         /* sanity check supported bands/channels */
 739         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 740                 sband = wiphy->bands[band];
 741                 if (!sband)
 742                         continue;
 743
 744                 sband->band = band;
 745                 if (WARN_ON(!sband->n_channels))
 746                         return -EINVAL;
 747                 /*
 748                  * on 60GHz band, there are no legacy rates, so
 749                  * n_bitrates is 0
 750                  */
 751                 if (WARN_ON(band != NL80211_BAND_60GHZ &&
 752                             !sband->n_bitrates))
 753                         return -EINVAL;
 754
 755                 /*
 756                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 757                  * modify the sband's ht data even if the driver uses a
 758                  * global structure for that.
 759                  */
 760                 if (cfg80211_disable_40mhz_24ghz &&
 761                     band == NL80211_BAND_2GHZ &&
 762                     sband->ht_cap.ht_supported) {
 763                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 764                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 765                 }
 766
 767                 /*
 768                  * Since we use a u32 for rate bitmaps in
 769                  * ieee80211_get_response_rate, we cannot
 770                  * have more than 32 legacy rates.
 771                  */
 772                 if (WARN_ON(sband->n_bitrates > 32))
 773                         return -EINVAL;
 774
 775                 for (i = 0; i < sband->n_channels; i++) {
 776                         sband->channels[i].orig_flags =
 777                                 sband->channels[i].flags;
 778                         sband->channels[i].orig_mag = INT_MAX;
 779                         sband->channels[i].orig_mpwr =
 780                                 sband->channels[i].max_power;
 781                         sband->channels[i].band = band;
 782                 }
 783
 784                 have_band = true;
 785         }
 786
 787         if (!have_band) {
 788                 WARN_ON(1);
 789                 return -EINVAL;
 790         }
 791
 792 #ifdef CONFIG_PM
 793         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 794                     (!rdev->wiphy.wowlan->pattern_min_len ||
 795                      rdev->wiphy.wowlan->pattern_min_len >
 796                                 rdev->wiphy.wowlan->pattern_max_len)))
 797                 return -EINVAL;
 798 #endif
 799
 800         /* check and set up bitrates */
 801         ieee80211_set_bitrate_flags(wiphy);
 802
 803         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 804
 805         rtnl_lock();
 806         res = device_add(&rdev->wiphy.dev);
 807         if (res) {
 808                 rtnl_unlock();
 809                 return res;
 810         }
 811
 812         /* set up regulatory info */
 813         wiphy_regulatory_register(wiphy);
 814
 815         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 816         cfg80211_rdev_list_generation++;
 817
 818         /* add to debugfs */
 819         rdev->wiphy.debugfsdir =
 820                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 821                                    ieee80211_debugfs_dir);
 822         if (IS_ERR(rdev->wiphy.debugfsdir))
 823                 rdev->wiphy.debugfsdir = NULL;
 824
 825         cfg80211_debugfs_rdev_add(rdev);
 826         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 827
 828         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 829                 struct regulatory_request request;
 830
 831                 request.wiphy_idx = get_wiphy_idx(wiphy);
 832                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 833                 request.alpha2[0] = '9';
 834                 request.alpha2[1] = '9';
 835
 836                 nl80211_send_reg_change_event(&request);
 837         }
 838
 839         /* Check that nobody globally advertises any capabilities they do not
 840          * advertise on all possible interface types.
 841          */
 842         if (wiphy->extended_capabilities_len &&
 843             wiphy->num_iftype_ext_capab &&
 844             wiphy->iftype_ext_capab) {
 845                 u8 supported_on_all, j;
 846                 const struct wiphy_iftype_ext_capab *capab;
 847
 848                 capab = wiphy->iftype_ext_capab;
 849                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
 850                         if (capab[0].extended_capabilities_len > j)
 851                                 supported_on_all =
 852                                         capab[0].extended_capabilities[j];
 853                         else
 854                                 supported_on_all = 0x00;
 855                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
 856                                 if (j >= capab[i].extended_capabilities_len) {
 857                                         supported_on_all = 0x00;
 858                                         break;
 859                                 }
 860                                 supported_on_all &=
 861                                         capab[i].extended_capabilities[j];
 862                         }
 863                         if (WARN_ON(wiphy->extended_capabilities[j] &
 864                                     ~supported_on_all))
 865                                 break;
 866                 }
 867         }
 868
 869         rdev->wiphy.registered = true;
 870         rtnl_unlock();
 871
 872         res = rfkill_register(rdev->rfkill);
 873         if (res) {
 874                 rfkill_destroy(rdev->rfkill);
 875                 rdev->rfkill = NULL;
 876                 wiphy_unregister(&rdev->wiphy);
 877                 return res;
 878         }
 879
 880         return 0;
 881 }
 882 EXPORT_SYMBOL(wiphy_register);
 883
 884 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 885 {
 886         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 887
 888         if (!rdev->ops->rfkill_poll)
 889                 return;
 890         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 891         rfkill_resume_polling(rdev->rfkill);
 892 }
 893 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 894
 895 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 896 {
 897         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 898
 899         rfkill_pause_polling(rdev->rfkill);
 900 }
 901 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 902
 903 void wiphy_unregister(struct wiphy *wiphy)
 904 {
 905         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 906
 907         wait_event(rdev->dev_wait, ({
 908                 int __count;
 909                 rtnl_lock();
 910                 __count = rdev->opencount;
 911                 rtnl_unlock();
 912                 __count == 0; }));
 913
 914         if (rdev->rfkill)
 915                 rfkill_unregister(rdev->rfkill);
 916
 917         rtnl_lock();
 918         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 919         rdev->wiphy.registered = false;
 920
 921         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
 922
 923         /*
 924          * First remove the hardware from everywhere, this makes
 925          * it impossible to find from userspace.
 926          */
 927         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 928         list_del_rcu(&rdev->list);
 929         synchronize_rcu();
 930
 931         /*
 932          * If this device got a regulatory hint tell core its
 933          * free to listen now to a new shiny device regulatory hint
 934          */
 935         wiphy_regulatory_deregister(wiphy);
 936
 937         cfg80211_rdev_list_generation++;
 938         device_del(&rdev->wiphy.dev);
 939
 940         rtnl_unlock();
 941
 942         flush_work(&rdev->scan_done_wk);
 943         cancel_work_sync(&rdev->conn_work);
 944         flush_work(&rdev->event_work);
 945         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 946         flush_work(&rdev->destroy_work);
 947         flush_work(&rdev->sched_scan_stop_wk);
 948         flush_work(&rdev->mlme_unreg_wk);
 949         flush_work(&rdev->propagate_radar_detect_wk);
 950         flush_work(&rdev->propagate_cac_done_wk);
 951
 952 #ifdef CONFIG_PM
 953         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
 954                 rdev_set_wakeup(rdev, false);
 955 #endif
 956         cfg80211_rdev_free_wowlan(rdev);
 957         cfg80211_rdev_free_coalesce(rdev);
 958 }
 959 EXPORT_SYMBOL(wiphy_unregister);
 960
 961 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 962 {
 963         struct cfg80211_internal_bss *scan, *tmp;
 964         struct cfg80211_beacon_registration *reg, *treg;
 965         rfkill_destroy(rdev->rfkill);
 966         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 967                 list_del(&reg->list);
 968                 kfree(reg);
 969         }
 970         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 971                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 972         kfree(rdev);
 973 }
 974
 975 void wiphy_free(struct wiphy *wiphy)
 976 {
 977         put_device(&wiphy->dev);
 978 }
 979 EXPORT_SYMBOL(wiphy_free);
 980
 981 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 982 {
 983         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 984
 985         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 986                 schedule_work(&rdev->rfkill_sync);
 987 }
 988 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 989
 990 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
 991 {
 992         kfree(wdev->cqm_config);
 993         wdev->cqm_config = NULL;
 994 }
 995
 996 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 997 {
 998         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 999
1000         ASSERT_RTNL();
1001
1002         if (WARN_ON(wdev->netdev))
1003                 return;
1004
1005         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1006
1007         list_del_rcu(&wdev->list);
1008         rdev->devlist_generation++;
1009
1010         switch (wdev->iftype) {
1011         case NL80211_IFTYPE_P2P_DEVICE:
1012                 cfg80211_mlme_purge_registrations(wdev);
1013                 cfg80211_stop_p2p_device(rdev, wdev);
1014                 break;
1015         case NL80211_IFTYPE_NAN:
1016                 cfg80211_stop_nan(rdev, wdev);
1017                 break;
1018         default:
1019                 WARN_ON_ONCE(1);
1020                 break;
1021         }
1022
1023         cfg80211_cqm_config_free(wdev);
1024 }
1025 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1026
1027 static const struct device_type wiphy_type = {
1028         .name   = "wlan",
1029 };
1030
1031 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1032                                enum nl80211_iftype iftype, int num)
1033 {
1034         ASSERT_RTNL();
1035
1036         rdev->num_running_ifaces += num;
1037         if (iftype == NL80211_IFTYPE_MONITOR)
1038                 rdev->num_running_monitor_ifaces += num;
1039 }
1040
1041 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1042                       struct wireless_dev *wdev)
1043 {
1044         struct net_device *dev = wdev->netdev;
1045         struct cfg80211_sched_scan_request *pos, *tmp;
1046
1047         ASSERT_RTNL();
1048         ASSERT_WDEV_LOCK(wdev);
1049
1050         switch (wdev->iftype) {
1051         case NL80211_IFTYPE_ADHOC:
1052                 __cfg80211_leave_ibss(rdev, dev, true);
1053                 break;
1054         case NL80211_IFTYPE_P2P_CLIENT:
1055         case NL80211_IFTYPE_STATION:
1056                 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1057                                          list) {
1058                         if (dev == pos->dev)
1059                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1060                 }
1061
1062 #ifdef CONFIG_CFG80211_WEXT
1063                 kfree(wdev->wext.ie);
1064                 wdev->wext.ie = NULL;
1065                 wdev->wext.ie_len = 0;
1066                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1067 #endif
1068                 cfg80211_disconnect(rdev, dev,
1069                                     WLAN_REASON_DEAUTH_LEAVING, true);
1070                 break;
1071         case NL80211_IFTYPE_MESH_POINT:
1072                 __cfg80211_leave_mesh(rdev, dev);
1073                 break;
1074         case NL80211_IFTYPE_AP:
1075         case NL80211_IFTYPE_P2P_GO:
1076                 __cfg80211_stop_ap(rdev, dev, true);
1077                 break;
1078         case NL80211_IFTYPE_OCB:
1079                 __cfg80211_leave_ocb(rdev, dev);
1080                 break;
1081         case NL80211_IFTYPE_WDS:
1082                 /* must be handled by mac80211/driver, has no APIs */
1083                 break;
1084         case NL80211_IFTYPE_P2P_DEVICE:
1085         case NL80211_IFTYPE_NAN:
1086                 /* cannot happen, has no netdev */
1087                 break;
1088         case NL80211_IFTYPE_AP_VLAN:
1089         case NL80211_IFTYPE_MONITOR:
1090                 /* nothing to do */
1091                 break;
1092         case NL80211_IFTYPE_UNSPECIFIED:
1093         case NUM_NL80211_IFTYPES:
1094                 /* invalid */
1095                 break;
1096         }
1097 }
1098
1099 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1100                     struct wireless_dev *wdev)
1101 {
1102         wdev_lock(wdev);
1103         __cfg80211_leave(rdev, wdev);
1104         wdev_unlock(wdev);
1105 }
1106
1107 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1108                          gfp_t gfp)
1109 {
1110         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1111         struct cfg80211_event *ev;
1112         unsigned long flags;
1113
1114         trace_cfg80211_stop_iface(wiphy, wdev);
1115
1116         ev = kzalloc(sizeof(*ev), gfp);
1117         if (!ev)
1118                 return;
1119
1120         ev->type = EVENT_STOPPED;
1121
1122         spin_lock_irqsave(&wdev->event_lock, flags);
1123         list_add_tail(&ev->list, &wdev->event_list);
1124         spin_unlock_irqrestore(&wdev->event_lock, flags);
1125         queue_work(cfg80211_wq, &rdev->event_work);
1126 }
1127 EXPORT_SYMBOL(cfg80211_stop_iface);
1128
1129 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1130                                          unsigned long state, void *ptr)
1131 {
1132         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1133         struct wireless_dev *wdev = dev->ieee80211_ptr;
1134         struct cfg80211_registered_device *rdev;
1135         struct cfg80211_sched_scan_request *pos, *tmp;
1136
1137         if (!wdev)
1138                 return NOTIFY_DONE;
1139
1140         rdev = wiphy_to_rdev(wdev->wiphy);
1141
1142         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1143
1144         switch (state) {
1145         case NETDEV_POST_INIT:
1146                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1147                 break;
1148         case NETDEV_REGISTER:
1149                 /*
1150                  * NB: cannot take rdev->mtx here because this may be
1151                  * called within code protected by it when interfaces
1152                  * are added with nl80211.
1153                  */
1154                 mutex_init(&wdev->mtx);
1155                 INIT_LIST_HEAD(&wdev->event_list);
1156                 spin_lock_init(&wdev->event_lock);
1157                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1158                 spin_lock_init(&wdev->mgmt_registrations_lock);
1159
1160                 /*
1161                  * We get here also when the interface changes network namespaces,
1162                  * as it's registered into the new one, but we don't want it to
1163                  * change ID in that case. Checking if the ID is already assigned
1164                  * works, because 0 isn't considered a valid ID and the memory is
1165                  * 0-initialized.
1166                  */
1167                 if (!wdev->identifier)
1168                         wdev->identifier = ++rdev->wdev_id;
1169                 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1170                 rdev->devlist_generation++;
1171                 /* can only change netns with wiphy */
1172                 dev->features |= NETIF_F_NETNS_LOCAL;
1173
1174                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1175                                       "phy80211")) {
1176                         pr_err("failed to add phy80211 symlink to netdev!\n");
1177                 }
1178                 wdev->netdev = dev;
1179 #ifdef CONFIG_CFG80211_WEXT
1180                 wdev->wext.default_key = -1;
1181                 wdev->wext.default_mgmt_key = -1;
1182                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1183 #endif
1184
1185                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1186                         wdev->ps = true;
1187                 else
1188                         wdev->ps = false;
1189                 /* allow mac80211 to determine the timeout */
1190                 wdev->ps_timeout = -1;
1191
1192                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1193                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1194                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1195                         dev->priv_flags |= IFF_DONT_BRIDGE;
1196
1197                 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1198
1199                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1200                 break;
1201         case NETDEV_GOING_DOWN:
1202                 cfg80211_leave(rdev, wdev);
1203                 break;
1204         case NETDEV_DOWN:
1205                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1206                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1207                         if (WARN_ON(!rdev->scan_req->notified))
1208                                 rdev->scan_req->info.aborted = true;
1209                         ___cfg80211_scan_done(rdev, false);
1210                 }
1211
1212                 list_for_each_entry_safe(pos, tmp,
1213                                          &rdev->sched_scan_req_list, list) {
1214                         if (WARN_ON(pos && pos->dev == wdev->netdev))
1215                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1216                 }
1217
1218                 rdev->opencount--;
1219                 wake_up(&rdev->dev_wait);
1220                 break;
1221         case NETDEV_UP:
1222                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1223                 wdev_lock(wdev);
1224                 switch (wdev->iftype) {
1225 #ifdef CONFIG_CFG80211_WEXT
1226                 case NL80211_IFTYPE_ADHOC:
1227                         cfg80211_ibss_wext_join(rdev, wdev);
1228                         break;
1229                 case NL80211_IFTYPE_STATION:
1230                         cfg80211_mgd_wext_connect(rdev, wdev);
1231                         break;
1232 #endif
1233 #ifdef CONFIG_MAC80211_MESH
1234                 case NL80211_IFTYPE_MESH_POINT:
1235                         {
1236                                 /* backward compat code... */
1237                                 struct mesh_setup setup;
1238                                 memcpy(&setup, &default_mesh_setup,
1239                                                 sizeof(setup));
1240                                  /* back compat only needed for mesh_id */
1241                                 setup.mesh_id = wdev->ssid;
1242                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1243                                 if (wdev->mesh_id_up_len)
1244                                         __cfg80211_join_mesh(rdev, dev,
1245                                                         &setup,
1246                                                         &default_mesh_config);
1247                                 break;
1248                         }
1249 #endif
1250                 default:
1251                         break;
1252                 }
1253                 wdev_unlock(wdev);
1254                 rdev->opencount++;
1255
1256                 /*
1257                  * Configure power management to the driver here so that its
1258                  * correctly set also after interface type changes etc.
1259                  */
1260                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1261                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1262                     rdev->ops->set_power_mgmt &&
1263                     rdev_set_power_mgmt(rdev, dev, wdev->ps,
1264                                         wdev->ps_timeout)) {
1265                         /* assume this means it's off */
1266                         wdev->ps = false;
1267                 }
1268                 break;
1269         case NETDEV_UNREGISTER:
1270                 /*
1271                  * It is possible to get NETDEV_UNREGISTER
1272                  * multiple times. To detect that, check
1273                  * that the interface is still on the list
1274                  * of registered interfaces, and only then
1275                  * remove and clean it up.
1276                  */
1277                 if (!list_empty(&wdev->list)) {
1278                         nl80211_notify_iface(rdev, wdev,
1279                                              NL80211_CMD_DEL_INTERFACE);
1280                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1281                         list_del_rcu(&wdev->list);
1282                         rdev->devlist_generation++;
1283                         cfg80211_mlme_purge_registrations(wdev);
1284 #ifdef CONFIG_CFG80211_WEXT
1285                         kzfree(wdev->wext.keys);
1286 #endif
1287                         flush_work(&wdev->disconnect_wk);
1288                         cfg80211_cqm_config_free(wdev);
1289                 }
1290                 /*
1291                  * synchronise (so that we won't find this netdev
1292                  * from other code any more) and then clear the list
1293                  * head so that the above code can safely check for
1294                  * !list_empty() to avoid double-cleanup.
1295                  */
1296                 synchronize_rcu();
1297                 INIT_LIST_HEAD(&wdev->list);
1298                 /*
1299                  * Ensure that all events have been processed and
1300                  * freed.
1301                  */
1302                 cfg80211_process_wdev_events(wdev);
1303
1304                 if (WARN_ON(wdev->current_bss)) {
1305                         cfg80211_unhold_bss(wdev->current_bss);
1306                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1307                         wdev->current_bss = NULL;
1308                 }
1309                 break;
1310         case NETDEV_PRE_UP:
1311                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1312                         return notifier_from_errno(-EOPNOTSUPP);
1313                 if (rfkill_blocked(rdev->rfkill))
1314                         return notifier_from_errno(-ERFKILL);
1315                 break;
1316         default:
1317                 return NOTIFY_DONE;
1318         }
1319
1320         wireless_nlevent_flush();
1321
1322         return NOTIFY_OK;
1323 }
1324
1325 static struct notifier_block cfg80211_netdev_notifier = {
1326         .notifier_call = cfg80211_netdev_notifier_call,
1327 };
1328
1329 static void __net_exit cfg80211_pernet_exit(struct net *net)
1330 {
1331         struct cfg80211_registered_device *rdev;
1332
1333         rtnl_lock();
1334         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1335                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1336                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1337         }
1338         rtnl_unlock();
1339 }
1340
1341 static struct pernet_operations cfg80211_pernet_ops = {
1342         .exit = cfg80211_pernet_exit,
1343 };
1344
1345 static int __init cfg80211_init(void)
1346 {
1347         int err;
1348
1349         err = register_pernet_device(&cfg80211_pernet_ops);
1350         if (err)
1351                 goto out_fail_pernet;
1352
1353         err = wiphy_sysfs_init();
1354         if (err)
1355                 goto out_fail_sysfs;
1356
1357         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1358         if (err)
1359                 goto out_fail_notifier;
1360
1361         err = nl80211_init();
1362         if (err)
1363                 goto out_fail_nl80211;
1364
1365         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1366
1367         err = regulatory_init();
1368         if (err)
1369                 goto out_fail_reg;
1370
1371         cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1372         if (!cfg80211_wq) {
1373                 err = -ENOMEM;
1374                 goto out_fail_wq;
1375         }
1376
1377         return 0;
1378
1379 out_fail_wq:
1380         regulatory_exit();
1381 out_fail_reg:
1382         debugfs_remove(ieee80211_debugfs_dir);
1383         nl80211_exit();
1384 out_fail_nl80211:
1385         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1386 out_fail_notifier:
1387         wiphy_sysfs_exit();
1388 out_fail_sysfs:
1389         unregister_pernet_device(&cfg80211_pernet_ops);
1390 out_fail_pernet:
1391         return err;
1392 }
1393 fs_initcall(cfg80211_init);
1394
1395 static void __exit cfg80211_exit(void)
1396 {
1397         debugfs_remove(ieee80211_debugfs_dir);
1398         nl80211_exit();
1399         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1400         wiphy_sysfs_exit();
1401         regulatory_exit();
1402         unregister_pernet_device(&cfg80211_pernet_ops);
1403         destroy_workqueue(cfg80211_wq);
1404 }
1405 module_exit(cfg80211_exit);