net/wireless/core.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * This is the linux wireless configuration interface.
   4  *
   5  * Copyright 2006-2010          Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  * Copyright 2015-2017  Intel Deutschland GmbH
   8  * Copyright (C) 2018-2022 Intel Corporation
   9  */
  10
  11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  12
  13 #include <linux/if.h>
  14 #include <linux/module.h>
  15 #include <linux/err.h>
  16 #include <linux/list.h>
  17 #include <linux/slab.h>
  18 #include <linux/nl80211.h>
  19 #include <linux/debugfs.h>
  20 #include <linux/notifier.h>
  21 #include <linux/device.h>
  22 #include <linux/etherdevice.h>
  23 #include <linux/rtnetlink.h>
  24 #include <linux/sched.h>
  25 #include <net/genetlink.h>
  26 #include <net/cfg80211.h>
  27 #include "nl80211.h"
  28 #include "core.h"
  29 #include "sysfs.h"
  30 #include "debugfs.h"
  31 #include "wext-compat.h"
  32 #include "rdev-ops.h"
  33
  34 /* name for sysfs, %d is appended */
  35 #define PHY_NAME "phy"
  36
  37 MODULE_AUTHOR("Johannes Berg");
  38 MODULE_LICENSE("GPL");
  39 MODULE_DESCRIPTION("wireless configuration support");
  40 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
  41
  42 /* RCU-protected (and RTNL for writers) */
  43 LIST_HEAD(cfg80211_rdev_list);
  44 int cfg80211_rdev_list_generation;
  45
  46 /* for debugfs */
  47 static struct dentry *ieee80211_debugfs_dir;
  48
  49 /* for the cleanup, scan and event works */
  50 struct workqueue_struct *cfg80211_wq;
  51
  52 static bool cfg80211_disable_40mhz_24ghz;
  53 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  54 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  55                  "Disable 40MHz support in the 2.4GHz band");
  56
  57 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  58 {
  59         struct cfg80211_registered_device *result = NULL, *rdev;
  60
  61         ASSERT_RTNL();
  62
  63         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  64                 if (rdev->wiphy_idx == wiphy_idx) {
  65                         result = rdev;
  66                         break;
  67                 }
  68         }
  69
  70         return result;
  71 }
  72
  73 int get_wiphy_idx(struct wiphy *wiphy)
  74 {
  75         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
  76
  77         return rdev->wiphy_idx;
  78 }
  79
  80 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  81 {
  82         struct cfg80211_registered_device *rdev;
  83
  84         ASSERT_RTNL();
  85
  86         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  87         if (!rdev)
  88                 return NULL;
  89         return &rdev->wiphy;
  90 }
  91
  92 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
  93                                    const char *newname)
  94 {
  95         struct cfg80211_registered_device *rdev2;
  96         int wiphy_idx, taken = -1, digits;
  97
  98         ASSERT_RTNL();
  99
 100         if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
 101                 return -EINVAL;
 102
 103         /* prohibit calling the thing phy%d when %d is not its number */
 104         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 105         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 106                 /* count number of places needed to print wiphy_idx */
 107                 digits = 1;
 108                 while (wiphy_idx /= 10)
 109                         digits++;
 110                 /*
 111                  * deny the name if it is phy<idx> where <idx> is printed
 112                  * without leading zeroes. taken == strlen(newname) here
 113                  */
 114                 if (taken == strlen(PHY_NAME) + digits)
 115                         return -EINVAL;
 116         }
 117
 118         /* Ensure another device does not already have this name. */
 119         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 120                 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
 121                         return -EINVAL;
 122
 123         return 0;
 124 }
 125
 126 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 127                         char *newname)
 128 {
 129         int result;
 130
 131         ASSERT_RTNL();
 132
 133         /* Ignore nop renames */
 134         if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
 135                 return 0;
 136
 137         result = cfg80211_dev_check_name(rdev, newname);
 138         if (result < 0)
 139                 return result;
 140
 141         result = device_rename(&rdev->wiphy.dev, newname);
 142         if (result)
 143                 return result;
 144
 145         if (!IS_ERR_OR_NULL(rdev->wiphy.debugfsdir))
 146                 debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 147                                rdev->wiphy.debugfsdir,
 148                                rdev->wiphy.debugfsdir->d_parent, newname);
 149
 150         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 151
 152         return 0;
 153 }
 154
 155 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 156                           struct net *net)
 157 {
 158         struct wireless_dev *wdev;
 159         int err = 0;
 160
 161         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 162                 return -EOPNOTSUPP;
 163
 164         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 165                 if (!wdev->netdev)
 166                         continue;
 167                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 168                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 169                 if (err)
 170                         break;
 171                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 172         }
 173
 174         if (err) {
 175                 /* failed -- clean up to old netns */
 176                 net = wiphy_net(&rdev->wiphy);
 177
 178                 list_for_each_entry_continue_reverse(wdev,
 179                                                      &rdev->wiphy.wdev_list,
 180                                                      list) {
 181                         if (!wdev->netdev)
 182                                 continue;
 183                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 184                         err = dev_change_net_namespace(wdev->netdev, net,
 185                                                         "wlan%d");
 186                         WARN_ON(err);
 187                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 188                 }
 189
 190                 return err;
 191         }
 192
 193         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 194                 if (!wdev->netdev)
 195                         continue;
 196                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
 197         }
 198         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 199
 200         wiphy_net_set(&rdev->wiphy, net);
 201
 202         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 203         WARN_ON(err);
 204
 205         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 206         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 207                 if (!wdev->netdev)
 208                         continue;
 209                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
 210         }
 211
 212         return 0;
 213 }
 214
 215 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 216 {
 217         struct cfg80211_registered_device *rdev = data;
 218
 219         rdev_rfkill_poll(rdev);
 220 }
 221
 222 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 223                               struct wireless_dev *wdev)
 224 {
 225         lockdep_assert_held(&rdev->wiphy.mtx);
 226
 227         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 228                 return;
 229
 230         if (!wdev_running(wdev))
 231                 return;
 232
 233         rdev_stop_p2p_device(rdev, wdev);
 234         wdev->is_running = false;
 235
 236         rdev->opencount--;
 237
 238         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 239                 if (WARN_ON(!rdev->scan_req->notified &&
 240                             (!rdev->int_scan_req ||
 241                              !rdev->int_scan_req->notified)))
 242                         rdev->scan_req->info.aborted = true;
 243                 ___cfg80211_scan_done(rdev, false);
 244         }
 245 }
 246
 247 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
 248                        struct wireless_dev *wdev)
 249 {
 250         lockdep_assert_held(&rdev->wiphy.mtx);
 251
 252         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
 253                 return;
 254
 255         if (!wdev_running(wdev))
 256                 return;
 257
 258         rdev_stop_nan(rdev, wdev);
 259         wdev->is_running = false;
 260
 261         rdev->opencount--;
 262 }
 263
 264 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 265 {
 266         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 267         struct wireless_dev *wdev;
 268
 269         ASSERT_RTNL();
 270
 271         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 272                 if (wdev->netdev) {
 273                         dev_close(wdev->netdev);
 274                         continue;
 275                 }
 276
 277                 /* otherwise, check iftype */
 278
 279                 wiphy_lock(wiphy);
 280
 281                 switch (wdev->iftype) {
 282                 case NL80211_IFTYPE_P2P_DEVICE:
 283                         cfg80211_stop_p2p_device(rdev, wdev);
 284                         break;
 285                 case NL80211_IFTYPE_NAN:
 286                         cfg80211_stop_nan(rdev, wdev);
 287                         break;
 288                 default:
 289                         break;
 290                 }
 291
 292                 wiphy_unlock(wiphy);
 293         }
 294 }
 295 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 296
 297 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 298 {
 299         struct cfg80211_registered_device *rdev = data;
 300
 301         if (!blocked)
 302                 return 0;
 303
 304         rtnl_lock();
 305         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 306         rtnl_unlock();
 307
 308         return 0;
 309 }
 310
 311 static void cfg80211_rfkill_block_work(struct work_struct *work)
 312 {
 313         struct cfg80211_registered_device *rdev;
 314
 315         rdev = container_of(work, struct cfg80211_registered_device,
 316                             rfkill_block);
 317         cfg80211_rfkill_set_block(rdev, true);
 318 }
 319
 320 static void cfg80211_event_work(struct work_struct *work)
 321 {
 322         struct cfg80211_registered_device *rdev;
 323
 324         rdev = container_of(work, struct cfg80211_registered_device,
 325                             event_work);
 326
 327         wiphy_lock(&rdev->wiphy);
 328         cfg80211_process_rdev_events(rdev);
 329         wiphy_unlock(&rdev->wiphy);
 330 }
 331
 332 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 333 {
 334         struct wireless_dev *wdev, *tmp;
 335
 336         ASSERT_RTNL();
 337
 338         list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
 339                 if (wdev->nl_owner_dead) {
 340                         if (wdev->netdev)
 341                                 dev_close(wdev->netdev);
 342
 343                         wiphy_lock(&rdev->wiphy);
 344                         cfg80211_leave(rdev, wdev);
 345                         rdev_del_virtual_intf(rdev, wdev);
 346                         wiphy_unlock(&rdev->wiphy);
 347                 }
 348         }
 349 }
 350
 351 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 352 {
 353         struct cfg80211_registered_device *rdev;
 354
 355         rdev = container_of(work, struct cfg80211_registered_device,
 356                             destroy_work);
 357
 358         rtnl_lock();
 359         cfg80211_destroy_ifaces(rdev);
 360         rtnl_unlock();
 361 }
 362
 363 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
 364 {
 365         struct cfg80211_registered_device *rdev;
 366         struct cfg80211_sched_scan_request *req, *tmp;
 367
 368         rdev = container_of(work, struct cfg80211_registered_device,
 369                            sched_scan_stop_wk);
 370
 371         rtnl_lock();
 372         list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
 373                 if (req->nl_owner_dead)
 374                         cfg80211_stop_sched_scan_req(rdev, req, false);
 375         }
 376         rtnl_unlock();
 377 }
 378
 379 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
 380 {
 381         struct cfg80211_registered_device *rdev;
 382
 383         rdev = container_of(work, struct cfg80211_registered_device,
 384                             propagate_radar_detect_wk);
 385
 386         rtnl_lock();
 387
 388         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
 389                                        NL80211_DFS_UNAVAILABLE,
 390                                        NL80211_RADAR_DETECTED);
 391
 392         rtnl_unlock();
 393 }
 394
 395 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
 396 {
 397         struct cfg80211_registered_device *rdev;
 398
 399         rdev = container_of(work, struct cfg80211_registered_device,
 400                             propagate_cac_done_wk);
 401
 402         rtnl_lock();
 403
 404         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
 405                                        NL80211_DFS_AVAILABLE,
 406                                        NL80211_RADAR_CAC_FINISHED);
 407
 408         rtnl_unlock();
 409 }
 410
 411 /* exported functions */
 412
 413 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 414                            const char *requested_name)
 415 {
 416         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 417
 418         struct cfg80211_registered_device *rdev;
 419         int alloc_size;
 420
 421         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 422         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 423         WARN_ON(ops->connect && !ops->disconnect);
 424         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 425         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 426         WARN_ON(ops->add_station && !ops->del_station);
 427         WARN_ON(ops->add_mpath && !ops->del_mpath);
 428         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 429         WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
 430         WARN_ON(ops->start_ap && !ops->stop_ap);
 431         WARN_ON(ops->join_ocb && !ops->leave_ocb);
 432         WARN_ON(ops->suspend && !ops->resume);
 433         WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
 434         WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
 435         WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
 436         WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
 437
 438         alloc_size = sizeof(*rdev) + sizeof_priv;
 439
 440         rdev = kzalloc(alloc_size, GFP_KERNEL);
 441         if (!rdev)
 442                 return NULL;
 443
 444         rdev->ops = ops;
 445
 446         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 447
 448         if (unlikely(rdev->wiphy_idx < 0)) {
 449                 /* ugh, wrapped! */
 450                 atomic_dec(&wiphy_counter);
 451                 kfree(rdev);
 452                 return NULL;
 453         }
 454
 455         /* atomic_inc_return makes it start at 1, make it start at 0 */
 456         rdev->wiphy_idx--;
 457
 458         /* give it a proper name */
 459         if (requested_name && requested_name[0]) {
 460                 int rv;
 461
 462                 rtnl_lock();
 463                 rv = cfg80211_dev_check_name(rdev, requested_name);
 464
 465                 if (rv < 0) {
 466                         rtnl_unlock();
 467                         goto use_default_name;
 468                 }
 469
 470                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 471                 rtnl_unlock();
 472                 if (rv)
 473                         goto use_default_name;
 474         } else {
 475                 int rv;
 476
 477 use_default_name:
 478                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 479                  * the restrictions on phy names.  Probably this call could
 480                  * fail if some other part of the kernel (re)named a device
 481                  * phyX.  But, might should add some locking and check return
 482                  * value, and use a different name if this one exists?
 483                  */
 484                 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 485                 if (rv < 0) {
 486                         kfree(rdev);
 487                         return NULL;
 488                 }
 489         }
 490
 491         mutex_init(&rdev->wiphy.mtx);
 492         INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
 493         INIT_LIST_HEAD(&rdev->beacon_registrations);
 494         spin_lock_init(&rdev->beacon_registrations_lock);
 495         spin_lock_init(&rdev->bss_lock);
 496         INIT_LIST_HEAD(&rdev->bss_list);
 497         INIT_LIST_HEAD(&rdev->sched_scan_req_list);
 498         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 499         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 500                           cfg80211_dfs_channels_update_work);
 501 #ifdef CONFIG_CFG80211_WEXT
 502         rdev->wiphy.wext = &cfg80211_wext_handler;
 503 #endif
 504
 505         device_initialize(&rdev->wiphy.dev);
 506         rdev->wiphy.dev.class = &ieee80211_class;
 507         rdev->wiphy.dev.platform_data = rdev;
 508         device_enable_async_suspend(&rdev->wiphy.dev);
 509
 510         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 511         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 512         INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
 513         INIT_WORK(&rdev->propagate_radar_detect_wk,
 514                   cfg80211_propagate_radar_detect_wk);
 515         INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
 516         INIT_WORK(&rdev->mgmt_registrations_update_wk,
 517                   cfg80211_mgmt_registrations_update_wk);
 518         spin_lock_init(&rdev->mgmt_registrations_lock);
 519
 520 #ifdef CONFIG_CFG80211_DEFAULT_PS
 521         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 522 #endif
 523
 524         wiphy_net_set(&rdev->wiphy, &init_net);
 525
 526         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 527         rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 528                                           &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 529                                           &rdev->rfkill_ops, rdev);
 530
 531         if (!rdev->wiphy.rfkill) {
 532                 wiphy_free(&rdev->wiphy);
 533                 return NULL;
 534         }
 535
 536         INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
 537         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 538         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 539
 540         init_waitqueue_head(&rdev->dev_wait);
 541
 542         /*
 543          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 544          * Fragmentation and RTS threshold are disabled by default with the
 545          * special -1 value.
 546          */
 547         rdev->wiphy.retry_short = 7;
 548         rdev->wiphy.retry_long = 4;
 549         rdev->wiphy.frag_threshold = (u32) -1;
 550         rdev->wiphy.rts_threshold = (u32) -1;
 551         rdev->wiphy.coverage_class = 0;
 552
 553         rdev->wiphy.max_num_csa_counters = 1;
 554
 555         rdev->wiphy.max_sched_scan_plans = 1;
 556         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 557
 558         return &rdev->wiphy;
 559 }
 560 EXPORT_SYMBOL(wiphy_new_nm);
 561
 562 static int wiphy_verify_combinations(struct wiphy *wiphy)
 563 {
 564         const struct ieee80211_iface_combination *c;
 565         int i, j;
 566
 567         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 568                 u32 cnt = 0;
 569                 u16 all_iftypes = 0;
 570
 571                 c = &wiphy->iface_combinations[i];
 572
 573                 /*
 574                  * Combinations with just one interface aren't real,
 575                  * however we make an exception for DFS.
 576                  */
 577                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 578                         return -EINVAL;
 579
 580                 /* Need at least one channel */
 581                 if (WARN_ON(!c->num_different_channels))
 582                         return -EINVAL;
 583
 584                 /* DFS only works on one channel. */
 585                 if (WARN_ON(c->radar_detect_widths &&
 586                             (c->num_different_channels > 1)))
 587                         return -EINVAL;
 588
 589                 if (WARN_ON(!c->n_limits))
 590                         return -EINVAL;
 591
 592                 for (j = 0; j < c->n_limits; j++) {
 593                         u16 types = c->limits[j].types;
 594
 595                         /* interface types shouldn't overlap */
 596                         if (WARN_ON(types & all_iftypes))
 597                                 return -EINVAL;
 598                         all_iftypes |= types;
 599
 600                         if (WARN_ON(!c->limits[j].max))
 601                                 return -EINVAL;
 602
 603                         /* Shouldn't list software iftypes in combinations! */
 604                         if (WARN_ON(wiphy->software_iftypes & types))
 605                                 return -EINVAL;
 606
 607                         /* Only a single P2P_DEVICE can be allowed */
 608                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 609                                     c->limits[j].max > 1))
 610                                 return -EINVAL;
 611
 612                         /* Only a single NAN can be allowed */
 613                         if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
 614                                     c->limits[j].max > 1))
 615                                 return -EINVAL;
 616
 617                         /*
 618                          * This isn't well-defined right now. If you have an
 619                          * IBSS interface, then its beacon interval may change
 620                          * by joining other networks, and nothing prevents it
 621                          * from doing that.
 622                          * So technically we probably shouldn't even allow AP
 623                          * and IBSS in the same interface, but it seems that
 624                          * some drivers support that, possibly only with fixed
 625                          * beacon intervals for IBSS.
 626                          */
 627                         if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
 628                                     c->beacon_int_min_gcd)) {
 629                                 return -EINVAL;
 630                         }
 631
 632                         cnt += c->limits[j].max;
 633                         /*
 634                          * Don't advertise an unsupported type
 635                          * in a combination.
 636                          */
 637                         if (WARN_ON((wiphy->interface_modes & types) != types))
 638                                 return -EINVAL;
 639                 }
 640
 641                 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
 642                         return -EINVAL;
 643
 644                 /* You can't even choose that many! */
 645                 if (WARN_ON(cnt < c->max_interfaces))
 646                         return -EINVAL;
 647         }
 648
 649         return 0;
 650 }
 651
 652 int wiphy_register(struct wiphy *wiphy)
 653 {
 654         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 655         int res;
 656         enum nl80211_band band;
 657         struct ieee80211_supported_band *sband;
 658         bool have_band = false;
 659         int i;
 660         u16 ifmodes = wiphy->interface_modes;
 661
 662 #ifdef CONFIG_PM
 663         if (WARN_ON(wiphy->wowlan &&
 664                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 665                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 666                 return -EINVAL;
 667         if (WARN_ON(wiphy->wowlan &&
 668                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 669                     !wiphy->wowlan->tcp))
 670                 return -EINVAL;
 671 #endif
 672         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 673                     (!rdev->ops->tdls_channel_switch ||
 674                      !rdev->ops->tdls_cancel_channel_switch)))
 675                 return -EINVAL;
 676
 677         if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
 678                     (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
 679                      !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
 680                      !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
 681                 return -EINVAL;
 682
 683         if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
 684                 return -EINVAL;
 685
 686         if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
 687                 return -EINVAL;
 688
 689         if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
 690                 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
 691                             !wiphy->pmsr_capa->ftm.non_asap))
 692                         return -EINVAL;
 693                 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
 694                             !wiphy->pmsr_capa->ftm.bandwidths))
 695                         return -EINVAL;
 696                 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
 697                                 ~(BIT(NL80211_PREAMBLE_LEGACY) |
 698                                   BIT(NL80211_PREAMBLE_HT) |
 699                                   BIT(NL80211_PREAMBLE_VHT) |
 700                                   BIT(NL80211_PREAMBLE_HE) |
 701                                   BIT(NL80211_PREAMBLE_DMG))))
 702                         return -EINVAL;
 703                 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
 704                              wiphy->pmsr_capa->ftm.non_trigger_based) &&
 705                             !(wiphy->pmsr_capa->ftm.preambles &
 706                               BIT(NL80211_PREAMBLE_HE))))
 707                         return -EINVAL;
 708                 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
 709                                 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
 710                                   BIT(NL80211_CHAN_WIDTH_20) |
 711                                   BIT(NL80211_CHAN_WIDTH_40) |
 712                                   BIT(NL80211_CHAN_WIDTH_80) |
 713                                   BIT(NL80211_CHAN_WIDTH_80P80) |
 714                                   BIT(NL80211_CHAN_WIDTH_160) |
 715                                   BIT(NL80211_CHAN_WIDTH_5) |
 716                                   BIT(NL80211_CHAN_WIDTH_10))))
 717                         return -EINVAL;
 718         }
 719
 720         /*
 721          * if a wiphy has unsupported modes for regulatory channel enforcement,
 722          * opt-out of enforcement checking
 723          */
 724         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 725                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 726                                        BIT(NL80211_IFTYPE_AP) |
 727                                        BIT(NL80211_IFTYPE_P2P_GO) |
 728                                        BIT(NL80211_IFTYPE_ADHOC) |
 729                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 730                                        BIT(NL80211_IFTYPE_NAN) |
 731                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 732                                        BIT(NL80211_IFTYPE_MONITOR)))
 733                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 734
 735         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 736                     (wiphy->regulatory_flags &
 737                                         (REGULATORY_CUSTOM_REG |
 738                                          REGULATORY_STRICT_REG |
 739                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 740                                          REGULATORY_COUNTRY_IE_IGNORE))))
 741                 return -EINVAL;
 742
 743         if (WARN_ON(wiphy->coalesce &&
 744                     (!wiphy->coalesce->n_rules ||
 745                      !wiphy->coalesce->n_patterns) &&
 746                     (!wiphy->coalesce->pattern_min_len ||
 747                      wiphy->coalesce->pattern_min_len >
 748                         wiphy->coalesce->pattern_max_len)))
 749                 return -EINVAL;
 750
 751         if (WARN_ON(wiphy->ap_sme_capa &&
 752                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 753                 return -EINVAL;
 754
 755         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 756                 return -EINVAL;
 757
 758         if (WARN_ON(wiphy->addresses &&
 759                     !is_zero_ether_addr(wiphy->perm_addr) &&
 760                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 761                            ETH_ALEN)))
 762                 return -EINVAL;
 763
 764         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 765                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 766                      !rdev->ops->set_mac_acl)))
 767                 return -EINVAL;
 768
 769         /* assure only valid behaviours are flagged by driver
 770          * hence subtract 2 as bit 0 is invalid.
 771          */
 772         if (WARN_ON(wiphy->bss_select_support &&
 773                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 774                 return -EINVAL;
 775
 776         if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
 777                                             NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
 778                     (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
 779                 return -EINVAL;
 780
 781         if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
 782                     rdev->ops->update_connect_params))
 783                 return -EINVAL;
 784
 785         if (wiphy->addresses)
 786                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 787
 788         /* sanity check ifmodes */
 789         WARN_ON(!ifmodes);
 790         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 791         if (WARN_ON(ifmodes != wiphy->interface_modes))
 792                 wiphy->interface_modes = ifmodes;
 793
 794         res = wiphy_verify_combinations(wiphy);
 795         if (res)
 796                 return res;
 797
 798         /* sanity check supported bands/channels */
 799         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 800                 u16 types = 0;
 801                 bool have_he = false;
 802
 803                 sband = wiphy->bands[band];
 804                 if (!sband)
 805                         continue;
 806
 807                 sband->band = band;
 808                 if (WARN_ON(!sband->n_channels))
 809                         return -EINVAL;
 810                 /*
 811                  * on 60GHz or sub-1Ghz band, there are no legacy rates, so
 812                  * n_bitrates is 0
 813                  */
 814                 if (WARN_ON((band != NL80211_BAND_60GHZ &&
 815                              band != NL80211_BAND_S1GHZ) &&
 816                             !sband->n_bitrates))
 817                         return -EINVAL;
 818
 819                 if (WARN_ON(band == NL80211_BAND_6GHZ &&
 820                             (sband->ht_cap.ht_supported ||
 821                              sband->vht_cap.vht_supported)))
 822                         return -EINVAL;
 823
 824                 /*
 825                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 826                  * modify the sband's ht data even if the driver uses a
 827                  * global structure for that.
 828                  */
 829                 if (cfg80211_disable_40mhz_24ghz &&
 830                     band == NL80211_BAND_2GHZ &&
 831                     sband->ht_cap.ht_supported) {
 832                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 833                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 834                 }
 835
 836                 /*
 837                  * Since we use a u32 for rate bitmaps in
 838                  * ieee80211_get_response_rate, we cannot
 839                  * have more than 32 legacy rates.
 840                  */
 841                 if (WARN_ON(sband->n_bitrates > 32))
 842                         return -EINVAL;
 843
 844                 for (i = 0; i < sband->n_channels; i++) {
 845                         sband->channels[i].orig_flags =
 846                                 sband->channels[i].flags;
 847                         sband->channels[i].orig_mag = INT_MAX;
 848                         sband->channels[i].orig_mpwr =
 849                                 sband->channels[i].max_power;
 850                         sband->channels[i].band = band;
 851
 852                         if (WARN_ON(sband->channels[i].freq_offset >= 1000))
 853                                 return -EINVAL;
 854                 }
 855
 856                 for (i = 0; i < sband->n_iftype_data; i++) {
 857                         const struct ieee80211_sband_iftype_data *iftd;
 858
 859                         iftd = &sband->iftype_data[i];
 860
 861                         if (WARN_ON(!iftd->types_mask))
 862                                 return -EINVAL;
 863                         if (WARN_ON(types & iftd->types_mask))
 864                                 return -EINVAL;
 865
 866                         /* at least one piece of information must be present */
 867                         if (WARN_ON(!iftd->he_cap.has_he))
 868                                 return -EINVAL;
 869
 870                         types |= iftd->types_mask;
 871
 872                         if (i == 0)
 873                                 have_he = iftd->he_cap.has_he;
 874                         else
 875                                 have_he = have_he &&
 876                                           iftd->he_cap.has_he;
 877                 }
 878
 879                 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
 880                         return -EINVAL;
 881
 882                 have_band = true;
 883         }
 884
 885         if (!have_band) {
 886                 WARN_ON(1);
 887                 return -EINVAL;
 888         }
 889
 890         for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
 891                 /*
 892                  * Validate we have a policy (can be explicitly set to
 893                  * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
 894                  * we have at least one of doit/dumpit.
 895                  */
 896                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
 897                         return -EINVAL;
 898                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
 899                             !rdev->wiphy.vendor_commands[i].dumpit))
 900                         return -EINVAL;
 901         }
 902
 903 #ifdef CONFIG_PM
 904         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 905                     (!rdev->wiphy.wowlan->pattern_min_len ||
 906                      rdev->wiphy.wowlan->pattern_min_len >
 907                                 rdev->wiphy.wowlan->pattern_max_len)))
 908                 return -EINVAL;
 909 #endif
 910
 911         /* check and set up bitrates */
 912         ieee80211_set_bitrate_flags(wiphy);
 913
 914         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 915
 916         rtnl_lock();
 917         res = device_add(&rdev->wiphy.dev);
 918         if (res) {
 919                 rtnl_unlock();
 920                 return res;
 921         }
 922
 923         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 924         cfg80211_rdev_list_generation++;
 925
 926         /* add to debugfs */
 927         rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
 928                                                     ieee80211_debugfs_dir);
 929
 930         cfg80211_debugfs_rdev_add(rdev);
 931         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 932
 933         /* set up regulatory info */
 934         wiphy_regulatory_register(wiphy);
 935
 936         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 937                 struct regulatory_request request;
 938
 939                 request.wiphy_idx = get_wiphy_idx(wiphy);
 940                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 941                 request.alpha2[0] = '9';
 942                 request.alpha2[1] = '9';
 943
 944                 nl80211_send_reg_change_event(&request);
 945         }
 946
 947         /* Check that nobody globally advertises any capabilities they do not
 948          * advertise on all possible interface types.
 949          */
 950         if (wiphy->extended_capabilities_len &&
 951             wiphy->num_iftype_ext_capab &&
 952             wiphy->iftype_ext_capab) {
 953                 u8 supported_on_all, j;
 954                 const struct wiphy_iftype_ext_capab *capab;
 955
 956                 capab = wiphy->iftype_ext_capab;
 957                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
 958                         if (capab[0].extended_capabilities_len > j)
 959                                 supported_on_all =
 960                                         capab[0].extended_capabilities[j];
 961                         else
 962                                 supported_on_all = 0x00;
 963                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
 964                                 if (j >= capab[i].extended_capabilities_len) {
 965                                         supported_on_all = 0x00;
 966                                         break;
 967                                 }
 968                                 supported_on_all &=
 969                                         capab[i].extended_capabilities[j];
 970                         }
 971                         if (WARN_ON(wiphy->extended_capabilities[j] &
 972                                     ~supported_on_all))
 973                                 break;
 974                 }
 975         }
 976
 977         rdev->wiphy.registered = true;
 978         rtnl_unlock();
 979
 980         res = rfkill_register(rdev->wiphy.rfkill);
 981         if (res) {
 982                 rfkill_destroy(rdev->wiphy.rfkill);
 983                 rdev->wiphy.rfkill = NULL;
 984                 wiphy_unregister(&rdev->wiphy);
 985                 return res;
 986         }
 987
 988         return 0;
 989 }
 990 EXPORT_SYMBOL(wiphy_register);
 991
 992 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 993 {
 994         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 995
 996         if (!rdev->ops->rfkill_poll)
 997                 return;
 998         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 999         rfkill_resume_polling(wiphy->rfkill);
1000 }
1001 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
1002
1003 void wiphy_unregister(struct wiphy *wiphy)
1004 {
1005         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1006
1007         wait_event(rdev->dev_wait, ({
1008                 int __count;
1009                 wiphy_lock(&rdev->wiphy);
1010                 __count = rdev->opencount;
1011                 wiphy_unlock(&rdev->wiphy);
1012                 __count == 0; }));
1013
1014         if (rdev->wiphy.rfkill)
1015                 rfkill_unregister(rdev->wiphy.rfkill);
1016
1017         rtnl_lock();
1018         wiphy_lock(&rdev->wiphy);
1019         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1020         rdev->wiphy.registered = false;
1021
1022         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1023
1024         /*
1025          * First remove the hardware from everywhere, this makes
1026          * it impossible to find from userspace.
1027          */
1028         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1029         list_del_rcu(&rdev->list);
1030         synchronize_rcu();
1031
1032         /*
1033          * If this device got a regulatory hint tell core its
1034          * free to listen now to a new shiny device regulatory hint
1035          */
1036         wiphy_regulatory_deregister(wiphy);
1037
1038         cfg80211_rdev_list_generation++;
1039         device_del(&rdev->wiphy.dev);
1040
1041         wiphy_unlock(&rdev->wiphy);
1042         rtnl_unlock();
1043
1044         flush_work(&rdev->scan_done_wk);
1045         cancel_work_sync(&rdev->conn_work);
1046         flush_work(&rdev->event_work);
1047         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1048         flush_work(&rdev->destroy_work);
1049         flush_work(&rdev->sched_scan_stop_wk);
1050         flush_work(&rdev->propagate_radar_detect_wk);
1051         flush_work(&rdev->propagate_cac_done_wk);
1052         flush_work(&rdev->mgmt_registrations_update_wk);
1053
1054 #ifdef CONFIG_PM
1055         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1056                 rdev_set_wakeup(rdev, false);
1057 #endif
1058         cfg80211_rdev_free_wowlan(rdev);
1059         cfg80211_rdev_free_coalesce(rdev);
1060 }
1061 EXPORT_SYMBOL(wiphy_unregister);
1062
1063 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1064 {
1065         struct cfg80211_internal_bss *scan, *tmp;
1066         struct cfg80211_beacon_registration *reg, *treg;
1067         rfkill_destroy(rdev->wiphy.rfkill);
1068         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1069                 list_del(&reg->list);
1070                 kfree(reg);
1071         }
1072         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1073                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1074         mutex_destroy(&rdev->wiphy.mtx);
1075
1076         /*
1077          * The 'regd' can only be non-NULL if we never finished
1078          * initializing the wiphy and thus never went through the
1079          * unregister path - e.g. in failure scenarios. Thus, it
1080          * cannot have been visible to anyone if non-NULL, so we
1081          * can just free it here.
1082          */
1083         kfree(rcu_dereference_raw(rdev->wiphy.regd));
1084
1085         kfree(rdev);
1086 }
1087
1088 void wiphy_free(struct wiphy *wiphy)
1089 {
1090         put_device(&wiphy->dev);
1091 }
1092 EXPORT_SYMBOL(wiphy_free);
1093
1094 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
1095                                       enum rfkill_hard_block_reasons reason)
1096 {
1097         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1098
1099         if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason))
1100                 schedule_work(&rdev->rfkill_block);
1101 }
1102 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);
1103
1104 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1105 {
1106         kfree(wdev->cqm_config);
1107         wdev->cqm_config = NULL;
1108 }
1109
1110 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
1111                                       bool unregister_netdev)
1112 {
1113         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1114
1115         ASSERT_RTNL();
1116         lockdep_assert_held(&rdev->wiphy.mtx);
1117
1118         flush_work(&wdev->pmsr_free_wk);
1119
1120         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1121
1122         wdev->registered = false;
1123
1124         if (wdev->netdev) {
1125                 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
1126                 if (unregister_netdev)
1127                         unregister_netdevice(wdev->netdev);
1128         }
1129
1130         list_del_rcu(&wdev->list);
1131         synchronize_net();
1132         rdev->devlist_generation++;
1133
1134         cfg80211_mlme_purge_registrations(wdev);
1135
1136         switch (wdev->iftype) {
1137         case NL80211_IFTYPE_P2P_DEVICE:
1138                 cfg80211_stop_p2p_device(rdev, wdev);
1139                 break;
1140         case NL80211_IFTYPE_NAN:
1141                 cfg80211_stop_nan(rdev, wdev);
1142                 break;
1143         default:
1144                 break;
1145         }
1146
1147 #ifdef CONFIG_CFG80211_WEXT
1148         kfree_sensitive(wdev->wext.keys);
1149         wdev->wext.keys = NULL;
1150 #endif
1151         /* only initialized if we have a netdev */
1152         if (wdev->netdev)
1153                 flush_work(&wdev->disconnect_wk);
1154
1155         cfg80211_cqm_config_free(wdev);
1156
1157         /*
1158          * Ensure that all events have been processed and
1159          * freed.
1160          */
1161         cfg80211_process_wdev_events(wdev);
1162
1163         if (WARN_ON(wdev->current_bss)) {
1164                 cfg80211_unhold_bss(wdev->current_bss);
1165                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1166                 wdev->current_bss = NULL;
1167         }
1168 }
1169
1170 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1171 {
1172         _cfg80211_unregister_wdev(wdev, true);
1173 }
1174 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1175
1176 static const struct device_type wiphy_type = {
1177         .name   = "wlan",
1178 };
1179
1180 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1181                                enum nl80211_iftype iftype, int num)
1182 {
1183         lockdep_assert_held(&rdev->wiphy.mtx);
1184
1185         rdev->num_running_ifaces += num;
1186         if (iftype == NL80211_IFTYPE_MONITOR)
1187                 rdev->num_running_monitor_ifaces += num;
1188 }
1189
1190 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1191                       struct wireless_dev *wdev)
1192 {
1193         struct net_device *dev = wdev->netdev;
1194         struct cfg80211_sched_scan_request *pos, *tmp;
1195
1196         lockdep_assert_held(&rdev->wiphy.mtx);
1197         ASSERT_WDEV_LOCK(wdev);
1198
1199         cfg80211_pmsr_wdev_down(wdev);
1200
1201         switch (wdev->iftype) {
1202         case NL80211_IFTYPE_ADHOC:
1203                 __cfg80211_leave_ibss(rdev, dev, true);
1204                 break;
1205         case NL80211_IFTYPE_P2P_CLIENT:
1206         case NL80211_IFTYPE_STATION:
1207                 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1208                                          list) {
1209                         if (dev == pos->dev)
1210                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1211                 }
1212
1213 #ifdef CONFIG_CFG80211_WEXT
1214                 kfree(wdev->wext.ie);
1215                 wdev->wext.ie = NULL;
1216                 wdev->wext.ie_len = 0;
1217                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1218 #endif
1219                 cfg80211_disconnect(rdev, dev,
1220                                     WLAN_REASON_DEAUTH_LEAVING, true);
1221                 break;
1222         case NL80211_IFTYPE_MESH_POINT:
1223                 __cfg80211_leave_mesh(rdev, dev);
1224                 break;
1225         case NL80211_IFTYPE_AP:
1226         case NL80211_IFTYPE_P2P_GO:
1227                 __cfg80211_stop_ap(rdev, dev, true);
1228                 break;
1229         case NL80211_IFTYPE_OCB:
1230                 __cfg80211_leave_ocb(rdev, dev);
1231                 break;
1232         case NL80211_IFTYPE_P2P_DEVICE:
1233         case NL80211_IFTYPE_NAN:
1234                 /* cannot happen, has no netdev */
1235                 break;
1236         case NL80211_IFTYPE_AP_VLAN:
1237         case NL80211_IFTYPE_MONITOR:
1238                 /* nothing to do */
1239                 break;
1240         case NL80211_IFTYPE_UNSPECIFIED:
1241         case NL80211_IFTYPE_WDS:
1242         case NUM_NL80211_IFTYPES:
1243                 /* invalid */
1244                 break;
1245         }
1246 }
1247
1248 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1249                     struct wireless_dev *wdev)
1250 {
1251         wdev_lock(wdev);
1252         __cfg80211_leave(rdev, wdev);
1253         wdev_unlock(wdev);
1254 }
1255
1256 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1257                          gfp_t gfp)
1258 {
1259         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1260         struct cfg80211_event *ev;
1261         unsigned long flags;
1262
1263         trace_cfg80211_stop_iface(wiphy, wdev);
1264
1265         ev = kzalloc(sizeof(*ev), gfp);
1266         if (!ev)
1267                 return;
1268
1269         ev->type = EVENT_STOPPED;
1270
1271         spin_lock_irqsave(&wdev->event_lock, flags);
1272         list_add_tail(&ev->list, &wdev->event_list);
1273         spin_unlock_irqrestore(&wdev->event_lock, flags);
1274         queue_work(cfg80211_wq, &rdev->event_work);
1275 }
1276 EXPORT_SYMBOL(cfg80211_stop_iface);
1277
1278 void cfg80211_init_wdev(struct wireless_dev *wdev)
1279 {
1280         mutex_init(&wdev->mtx);
1281         INIT_LIST_HEAD(&wdev->event_list);
1282         spin_lock_init(&wdev->event_lock);
1283         INIT_LIST_HEAD(&wdev->mgmt_registrations);
1284         INIT_LIST_HEAD(&wdev->pmsr_list);
1285         spin_lock_init(&wdev->pmsr_lock);
1286         INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1287
1288 #ifdef CONFIG_CFG80211_WEXT
1289         wdev->wext.default_key = -1;
1290         wdev->wext.default_mgmt_key = -1;
1291         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1292 #endif
1293
1294         if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1295                 wdev->ps = true;
1296         else
1297                 wdev->ps = false;
1298         /* allow mac80211 to determine the timeout */
1299         wdev->ps_timeout = -1;
1300
1301         if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1302              wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1303              wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1304                 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1305
1306         INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1307 }
1308
1309 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1310                             struct wireless_dev *wdev)
1311 {
1312         ASSERT_RTNL();
1313         lockdep_assert_held(&rdev->wiphy.mtx);
1314
1315         /*
1316          * We get here also when the interface changes network namespaces,
1317          * as it's registered into the new one, but we don't want it to
1318          * change ID in that case. Checking if the ID is already assigned
1319          * works, because 0 isn't considered a valid ID and the memory is
1320          * 0-initialized.
1321          */
1322         if (!wdev->identifier)
1323                 wdev->identifier = ++rdev->wdev_id;
1324         list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1325         rdev->devlist_generation++;
1326         wdev->registered = true;
1327
1328         if (wdev->netdev &&
1329             sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj,
1330                               "phy80211"))
1331                 pr_err("failed to add phy80211 symlink to netdev!\n");
1332
1333         nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1334 }
1335
1336 int cfg80211_register_netdevice(struct net_device *dev)
1337 {
1338         struct wireless_dev *wdev = dev->ieee80211_ptr;
1339         struct cfg80211_registered_device *rdev;
1340         int ret;
1341
1342         ASSERT_RTNL();
1343
1344         if (WARN_ON(!wdev))
1345                 return -EINVAL;
1346
1347         rdev = wiphy_to_rdev(wdev->wiphy);
1348
1349         lockdep_assert_held(&rdev->wiphy.mtx);
1350
1351         /* we'll take care of this */
1352         wdev->registered = true;
1353         wdev->registering = true;
1354         ret = register_netdevice(dev);
1355         if (ret)
1356                 goto out;
1357
1358         cfg80211_register_wdev(rdev, wdev);
1359         ret = 0;
1360 out:
1361         wdev->registering = false;
1362         if (ret)
1363                 wdev->registered = false;
1364         return ret;
1365 }
1366 EXPORT_SYMBOL(cfg80211_register_netdevice);
1367
1368 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1369                                          unsigned long state, void *ptr)
1370 {
1371         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1372         struct wireless_dev *wdev = dev->ieee80211_ptr;
1373         struct cfg80211_registered_device *rdev;
1374         struct cfg80211_sched_scan_request *pos, *tmp;
1375
1376         if (!wdev)
1377                 return NOTIFY_DONE;
1378
1379         rdev = wiphy_to_rdev(wdev->wiphy);
1380
1381         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1382
1383         switch (state) {
1384         case NETDEV_POST_INIT:
1385                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1386                 wdev->netdev = dev;
1387                 /* can only change netns with wiphy */
1388                 dev->features |= NETIF_F_NETNS_LOCAL;
1389
1390                 cfg80211_init_wdev(wdev);
1391                 break;
1392         case NETDEV_REGISTER:
1393                 if (!wdev->registered) {
1394                         wiphy_lock(&rdev->wiphy);
1395                         cfg80211_register_wdev(rdev, wdev);
1396                         wiphy_unlock(&rdev->wiphy);
1397                 }
1398                 break;
1399         case NETDEV_UNREGISTER:
1400                 /*
1401                  * It is possible to get NETDEV_UNREGISTER multiple times,
1402                  * so check wdev->registered.
1403                  */
1404                 if (wdev->registered && !wdev->registering) {
1405                         wiphy_lock(&rdev->wiphy);
1406                         _cfg80211_unregister_wdev(wdev, false);
1407                         wiphy_unlock(&rdev->wiphy);
1408                 }
1409                 break;
1410         case NETDEV_GOING_DOWN:
1411                 wiphy_lock(&rdev->wiphy);
1412                 cfg80211_leave(rdev, wdev);
1413                 wiphy_unlock(&rdev->wiphy);
1414                 break;
1415         case NETDEV_DOWN:
1416                 wiphy_lock(&rdev->wiphy);
1417                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1418                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1419                         if (WARN_ON(!rdev->scan_req->notified &&
1420                                     (!rdev->int_scan_req ||
1421                                      !rdev->int_scan_req->notified)))
1422                                 rdev->scan_req->info.aborted = true;
1423                         ___cfg80211_scan_done(rdev, false);
1424                 }
1425
1426                 list_for_each_entry_safe(pos, tmp,
1427                                          &rdev->sched_scan_req_list, list) {
1428                         if (WARN_ON(pos->dev == wdev->netdev))
1429                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1430                 }
1431
1432                 rdev->opencount--;
1433                 wiphy_unlock(&rdev->wiphy);
1434                 wake_up(&rdev->dev_wait);
1435                 break;
1436         case NETDEV_UP:
1437                 wiphy_lock(&rdev->wiphy);
1438                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1439                 wdev_lock(wdev);
1440                 switch (wdev->iftype) {
1441 #ifdef CONFIG_CFG80211_WEXT
1442                 case NL80211_IFTYPE_ADHOC:
1443                         cfg80211_ibss_wext_join(rdev, wdev);
1444                         break;
1445                 case NL80211_IFTYPE_STATION:
1446                         cfg80211_mgd_wext_connect(rdev, wdev);
1447                         break;
1448 #endif
1449 #ifdef CONFIG_MAC80211_MESH
1450                 case NL80211_IFTYPE_MESH_POINT:
1451                         {
1452                                 /* backward compat code... */
1453                                 struct mesh_setup setup;
1454                                 memcpy(&setup, &default_mesh_setup,
1455                                                 sizeof(setup));
1456                                  /* back compat only needed for mesh_id */
1457                                 setup.mesh_id = wdev->ssid;
1458                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1459                                 if (wdev->mesh_id_up_len)
1460                                         __cfg80211_join_mesh(rdev, dev,
1461                                                         &setup,
1462                                                         &default_mesh_config);
1463                                 break;
1464                         }
1465 #endif
1466                 default:
1467                         break;
1468                 }
1469                 wdev_unlock(wdev);
1470                 rdev->opencount++;
1471
1472                 /*
1473                  * Configure power management to the driver here so that its
1474                  * correctly set also after interface type changes etc.
1475                  */
1476                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1477                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1478                     rdev->ops->set_power_mgmt &&
1479                     rdev_set_power_mgmt(rdev, dev, wdev->ps,
1480                                         wdev->ps_timeout)) {
1481                         /* assume this means it's off */
1482                         wdev->ps = false;
1483                 }
1484                 wiphy_unlock(&rdev->wiphy);
1485                 break;
1486         case NETDEV_PRE_UP:
1487                 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1488                                              wdev->use_4addr, 0))
1489                         return notifier_from_errno(-EOPNOTSUPP);
1490
1491                 if (rfkill_blocked(rdev->wiphy.rfkill))
1492                         return notifier_from_errno(-ERFKILL);
1493                 break;
1494         default:
1495                 return NOTIFY_DONE;
1496         }
1497
1498         wireless_nlevent_flush();
1499
1500         return NOTIFY_OK;
1501 }
1502
1503 static struct notifier_block cfg80211_netdev_notifier = {
1504         .notifier_call = cfg80211_netdev_notifier_call,
1505 };
1506
1507 static void __net_exit cfg80211_pernet_exit(struct net *net)
1508 {
1509         struct cfg80211_registered_device *rdev;
1510
1511         rtnl_lock();
1512         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1513                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1514                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1515         }
1516         rtnl_unlock();
1517 }
1518
1519 static struct pernet_operations cfg80211_pernet_ops = {
1520         .exit = cfg80211_pernet_exit,
1521 };
1522
1523 static int __init cfg80211_init(void)
1524 {
1525         int err;
1526
1527         err = register_pernet_device(&cfg80211_pernet_ops);
1528         if (err)
1529                 goto out_fail_pernet;
1530
1531         err = wiphy_sysfs_init();
1532         if (err)
1533                 goto out_fail_sysfs;
1534
1535         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1536         if (err)
1537                 goto out_fail_notifier;
1538
1539         err = nl80211_init();
1540         if (err)
1541                 goto out_fail_nl80211;
1542
1543         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1544
1545         err = regulatory_init();
1546         if (err)
1547                 goto out_fail_reg;
1548
1549         cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1550         if (!cfg80211_wq) {
1551                 err = -ENOMEM;
1552                 goto out_fail_wq;
1553         }
1554
1555         return 0;
1556
1557 out_fail_wq:
1558         regulatory_exit();
1559 out_fail_reg:
1560         debugfs_remove(ieee80211_debugfs_dir);
1561         nl80211_exit();
1562 out_fail_nl80211:
1563         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1564 out_fail_notifier:
1565         wiphy_sysfs_exit();
1566 out_fail_sysfs:
1567         unregister_pernet_device(&cfg80211_pernet_ops);
1568 out_fail_pernet:
1569         return err;
1570 }
1571 fs_initcall(cfg80211_init);
1572
1573 static void __exit cfg80211_exit(void)
1574 {
1575         debugfs_remove(ieee80211_debugfs_dir);
1576         nl80211_exit();
1577         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1578         wiphy_sysfs_exit();
1579         regulatory_exit();
1580         unregister_pernet_device(&cfg80211_pernet_ops);
1581         destroy_workqueue(cfg80211_wq);
1582 }
1583 module_exit(cfg80211_exit);