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 <[email protected]>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  * Copyright 2015-2017  Intel Deutschland GmbH
   8  * Copyright (C) 2018-2023 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         for_each_rdev(rdev) {
  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         for_each_rdev(rdev2)
 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         lockdep_assert_wiphy(&rdev->wiphy);
 133
 134         /* Ignore nop renames */
 135         if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
 136                 return 0;
 137
 138         result = cfg80211_dev_check_name(rdev, newname);
 139         if (result < 0)
 140                 return result;
 141
 142         result = device_rename(&rdev->wiphy.dev, newname);
 143         if (result)
 144                 return result;
 145
 146         if (!IS_ERR_OR_NULL(rdev->wiphy.debugfsdir))
 147                 debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 148                                rdev->wiphy.debugfsdir,
 149                                rdev->wiphy.debugfsdir->d_parent, newname);
 150
 151         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 152
 153         return 0;
 154 }
 155
 156 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 157                           struct net *net)
 158 {
 159         struct wireless_dev *wdev;
 160         int err = 0;
 161
 162         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 163                 return -EOPNOTSUPP;
 164
 165         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 166                 if (!wdev->netdev)
 167                         continue;
 168                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 169                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 170                 if (err)
 171                         break;
 172                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 173         }
 174
 175         if (err) {
 176                 /* failed -- clean up to old netns */
 177                 net = wiphy_net(&rdev->wiphy);
 178
 179                 list_for_each_entry_continue_reverse(wdev,
 180                                                      &rdev->wiphy.wdev_list,
 181                                                      list) {
 182                         if (!wdev->netdev)
 183                                 continue;
 184                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 185                         err = dev_change_net_namespace(wdev->netdev, net,
 186                                                         "wlan%d");
 187                         WARN_ON(err);
 188                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 189                 }
 190
 191                 return err;
 192         }
 193
 194         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 195                 if (!wdev->netdev)
 196                         continue;
 197                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
 198         }
 199
 200         wiphy_lock(&rdev->wiphy);
 201         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 202
 203         wiphy_net_set(&rdev->wiphy, net);
 204
 205         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 206         WARN_ON(err);
 207
 208         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 209         wiphy_unlock(&rdev->wiphy);
 210
 211         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 212                 if (!wdev->netdev)
 213                         continue;
 214                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
 215         }
 216
 217         return 0;
 218 }
 219
 220 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 221 {
 222         struct cfg80211_registered_device *rdev = data;
 223
 224         rdev_rfkill_poll(rdev);
 225 }
 226
 227 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 228                               struct wireless_dev *wdev)
 229 {
 230         lockdep_assert_held(&rdev->wiphy.mtx);
 231
 232         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 233                 return;
 234
 235         if (!wdev_running(wdev))
 236                 return;
 237
 238         rdev_stop_p2p_device(rdev, wdev);
 239         wdev->is_running = false;
 240
 241         rdev->opencount--;
 242
 243         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 244                 if (WARN_ON(!rdev->scan_req->notified &&
 245                             (!rdev->int_scan_req ||
 246                              !rdev->int_scan_req->notified)))
 247                         rdev->scan_req->info.aborted = true;
 248                 ___cfg80211_scan_done(rdev, false);
 249         }
 250 }
 251
 252 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
 253                        struct wireless_dev *wdev)
 254 {
 255         lockdep_assert_held(&rdev->wiphy.mtx);
 256
 257         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
 258                 return;
 259
 260         if (!wdev_running(wdev))
 261                 return;
 262
 263         rdev_stop_nan(rdev, wdev);
 264         wdev->is_running = false;
 265
 266         rdev->opencount--;
 267 }
 268
 269 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 270 {
 271         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 272         struct wireless_dev *wdev;
 273
 274         ASSERT_RTNL();
 275
 276         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 277                 if (wdev->netdev) {
 278                         dev_close(wdev->netdev);
 279                         continue;
 280                 }
 281
 282                 /* otherwise, check iftype */
 283
 284                 wiphy_lock(wiphy);
 285
 286                 switch (wdev->iftype) {
 287                 case NL80211_IFTYPE_P2P_DEVICE:
 288                         cfg80211_stop_p2p_device(rdev, wdev);
 289                         break;
 290                 case NL80211_IFTYPE_NAN:
 291                         cfg80211_stop_nan(rdev, wdev);
 292                         break;
 293                 default:
 294                         break;
 295                 }
 296
 297                 wiphy_unlock(wiphy);
 298         }
 299 }
 300 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 301
 302 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 303 {
 304         struct cfg80211_registered_device *rdev = data;
 305
 306         if (!blocked)
 307                 return 0;
 308
 309         rtnl_lock();
 310         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 311         rtnl_unlock();
 312
 313         return 0;
 314 }
 315
 316 static void cfg80211_rfkill_block_work(struct work_struct *work)
 317 {
 318         struct cfg80211_registered_device *rdev;
 319
 320         rdev = container_of(work, struct cfg80211_registered_device,
 321                             rfkill_block);
 322         cfg80211_rfkill_set_block(rdev, true);
 323 }
 324
 325 static void cfg80211_event_work(struct work_struct *work)
 326 {
 327         struct cfg80211_registered_device *rdev;
 328
 329         rdev = container_of(work, struct cfg80211_registered_device,
 330                             event_work);
 331
 332         wiphy_lock(&rdev->wiphy);
 333         cfg80211_process_rdev_events(rdev);
 334         wiphy_unlock(&rdev->wiphy);
 335 }
 336
 337 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 338 {
 339         struct wireless_dev *wdev, *tmp;
 340
 341         ASSERT_RTNL();
 342
 343         list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
 344                 if (wdev->nl_owner_dead) {
 345                         if (wdev->netdev)
 346                                 dev_close(wdev->netdev);
 347
 348                         wiphy_lock(&rdev->wiphy);
 349                         cfg80211_leave(rdev, wdev);
 350                         cfg80211_remove_virtual_intf(rdev, wdev);
 351                         wiphy_unlock(&rdev->wiphy);
 352                 }
 353         }
 354 }
 355
 356 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 357 {
 358         struct cfg80211_registered_device *rdev;
 359
 360         rdev = container_of(work, struct cfg80211_registered_device,
 361                             destroy_work);
 362
 363         rtnl_lock();
 364         cfg80211_destroy_ifaces(rdev);
 365         rtnl_unlock();
 366 }
 367
 368 static void cfg80211_sched_scan_stop_wk(struct wiphy *wiphy,
 369                                         struct wiphy_work *work)
 370 {
 371         struct cfg80211_registered_device *rdev;
 372         struct cfg80211_sched_scan_request *req, *tmp;
 373
 374         rdev = container_of(work, struct cfg80211_registered_device,
 375                            sched_scan_stop_wk);
 376
 377         list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
 378                 if (req->nl_owner_dead)
 379                         cfg80211_stop_sched_scan_req(rdev, req, false);
 380         }
 381 }
 382
 383 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
 384 {
 385         struct cfg80211_registered_device *rdev;
 386
 387         rdev = container_of(work, struct cfg80211_registered_device,
 388                             propagate_radar_detect_wk);
 389
 390         rtnl_lock();
 391
 392         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
 393                                        NL80211_DFS_UNAVAILABLE,
 394                                        NL80211_RADAR_DETECTED);
 395
 396         rtnl_unlock();
 397 }
 398
 399 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
 400 {
 401         struct cfg80211_registered_device *rdev;
 402
 403         rdev = container_of(work, struct cfg80211_registered_device,
 404                             propagate_cac_done_wk);
 405
 406         rtnl_lock();
 407
 408         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
 409                                        NL80211_DFS_AVAILABLE,
 410                                        NL80211_RADAR_CAC_FINISHED);
 411
 412         rtnl_unlock();
 413 }
 414
 415 static void cfg80211_wiphy_work(struct work_struct *work)
 416 {
 417         struct cfg80211_registered_device *rdev;
 418         struct wiphy_work *wk;
 419
 420         rdev = container_of(work, struct cfg80211_registered_device, wiphy_work);
 421
 422         wiphy_lock(&rdev->wiphy);
 423         if (rdev->suspended)
 424                 goto out;
 425
 426         spin_lock_irq(&rdev->wiphy_work_lock);
 427         wk = list_first_entry_or_null(&rdev->wiphy_work_list,
 428                                       struct wiphy_work, entry);
 429         if (wk) {
 430                 list_del_init(&wk->entry);
 431                 if (!list_empty(&rdev->wiphy_work_list))
 432                         schedule_work(work);
 433                 spin_unlock_irq(&rdev->wiphy_work_lock);
 434
 435                 wk->func(&rdev->wiphy, wk);
 436         } else {
 437                 spin_unlock_irq(&rdev->wiphy_work_lock);
 438         }
 439 out:
 440         wiphy_unlock(&rdev->wiphy);
 441 }
 442
 443 /* exported functions */
 444
 445 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 446                            const char *requested_name)
 447 {
 448         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 449
 450         struct cfg80211_registered_device *rdev;
 451         int alloc_size;
 452
 453         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 454         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 455         WARN_ON(ops->connect && !ops->disconnect);
 456         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 457         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 458         WARN_ON(ops->add_station && !ops->del_station);
 459         WARN_ON(ops->add_mpath && !ops->del_mpath);
 460         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 461         WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
 462         WARN_ON(ops->start_ap && !ops->stop_ap);
 463         WARN_ON(ops->join_ocb && !ops->leave_ocb);
 464         WARN_ON(ops->suspend && !ops->resume);
 465         WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
 466         WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
 467         WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
 468         WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
 469
 470         alloc_size = sizeof(*rdev) + sizeof_priv;
 471
 472         rdev = kzalloc(alloc_size, GFP_KERNEL);
 473         if (!rdev)
 474                 return NULL;
 475
 476         rdev->ops = ops;
 477
 478         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 479
 480         if (unlikely(rdev->wiphy_idx < 0)) {
 481                 /* ugh, wrapped! */
 482                 atomic_dec(&wiphy_counter);
 483                 kfree(rdev);
 484                 return NULL;
 485         }
 486
 487         /* atomic_inc_return makes it start at 1, make it start at 0 */
 488         rdev->wiphy_idx--;
 489
 490         /* give it a proper name */
 491         if (requested_name && requested_name[0]) {
 492                 int rv;
 493
 494                 rtnl_lock();
 495                 rv = cfg80211_dev_check_name(rdev, requested_name);
 496
 497                 if (rv < 0) {
 498                         rtnl_unlock();
 499                         goto use_default_name;
 500                 }
 501
 502                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 503                 rtnl_unlock();
 504                 if (rv)
 505                         goto use_default_name;
 506         } else {
 507                 int rv;
 508
 509 use_default_name:
 510                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 511                  * the restrictions on phy names.  Probably this call could
 512                  * fail if some other part of the kernel (re)named a device
 513                  * phyX.  But, might should add some locking and check return
 514                  * value, and use a different name if this one exists?
 515                  */
 516                 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 517                 if (rv < 0) {
 518                         kfree(rdev);
 519                         return NULL;
 520                 }
 521         }
 522
 523         mutex_init(&rdev->wiphy.mtx);
 524         INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
 525         INIT_LIST_HEAD(&rdev->beacon_registrations);
 526         spin_lock_init(&rdev->beacon_registrations_lock);
 527         spin_lock_init(&rdev->bss_lock);
 528         INIT_LIST_HEAD(&rdev->bss_list);
 529         INIT_LIST_HEAD(&rdev->sched_scan_req_list);
 530         wiphy_work_init(&rdev->scan_done_wk, __cfg80211_scan_done);
 531         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 532                           cfg80211_dfs_channels_update_work);
 533 #ifdef CONFIG_CFG80211_WEXT
 534         rdev->wiphy.wext = &cfg80211_wext_handler;
 535 #endif
 536
 537         device_initialize(&rdev->wiphy.dev);
 538         rdev->wiphy.dev.class = &ieee80211_class;
 539         rdev->wiphy.dev.platform_data = rdev;
 540         device_enable_async_suspend(&rdev->wiphy.dev);
 541
 542         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 543         wiphy_work_init(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 544         INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
 545         INIT_WORK(&rdev->propagate_radar_detect_wk,
 546                   cfg80211_propagate_radar_detect_wk);
 547         INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
 548         INIT_WORK(&rdev->mgmt_registrations_update_wk,
 549                   cfg80211_mgmt_registrations_update_wk);
 550         spin_lock_init(&rdev->mgmt_registrations_lock);
 551
 552 #ifdef CONFIG_CFG80211_DEFAULT_PS
 553         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 554 #endif
 555
 556         wiphy_net_set(&rdev->wiphy, &init_net);
 557
 558         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 559         rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 560                                           &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 561                                           &rdev->rfkill_ops, rdev);
 562
 563         if (!rdev->wiphy.rfkill) {
 564                 wiphy_free(&rdev->wiphy);
 565                 return NULL;
 566         }
 567
 568         INIT_WORK(&rdev->wiphy_work, cfg80211_wiphy_work);
 569         INIT_LIST_HEAD(&rdev->wiphy_work_list);
 570         spin_lock_init(&rdev->wiphy_work_lock);
 571         INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
 572         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 573         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 574         INIT_WORK(&rdev->background_cac_abort_wk,
 575                   cfg80211_background_cac_abort_wk);
 576         INIT_DELAYED_WORK(&rdev->background_cac_done_wk,
 577                           cfg80211_background_cac_done_wk);
 578
 579         init_waitqueue_head(&rdev->dev_wait);
 580
 581         /*
 582          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 583          * Fragmentation and RTS threshold are disabled by default with the
 584          * special -1 value.
 585          */
 586         rdev->wiphy.retry_short = 7;
 587         rdev->wiphy.retry_long = 4;
 588         rdev->wiphy.frag_threshold = (u32) -1;
 589         rdev->wiphy.rts_threshold = (u32) -1;
 590         rdev->wiphy.coverage_class = 0;
 591
 592         rdev->wiphy.max_num_csa_counters = 1;
 593
 594         rdev->wiphy.max_sched_scan_plans = 1;
 595         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 596
 597         return &rdev->wiphy;
 598 }
 599 EXPORT_SYMBOL(wiphy_new_nm);
 600
 601 static int wiphy_verify_combinations(struct wiphy *wiphy)
 602 {
 603         const struct ieee80211_iface_combination *c;
 604         int i, j;
 605
 606         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 607                 u32 cnt = 0;
 608                 u16 all_iftypes = 0;
 609
 610                 c = &wiphy->iface_combinations[i];
 611
 612                 /*
 613                  * Combinations with just one interface aren't real,
 614                  * however we make an exception for DFS.
 615                  */
 616                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 617                         return -EINVAL;
 618
 619                 /* Need at least one channel */
 620                 if (WARN_ON(!c->num_different_channels))
 621                         return -EINVAL;
 622
 623                 /* DFS only works on one channel. */
 624                 if (WARN_ON(c->radar_detect_widths &&
 625                             (c->num_different_channels > 1)))
 626                         return -EINVAL;
 627
 628                 if (WARN_ON(!c->n_limits))
 629                         return -EINVAL;
 630
 631                 for (j = 0; j < c->n_limits; j++) {
 632                         u16 types = c->limits[j].types;
 633
 634                         /* interface types shouldn't overlap */
 635                         if (WARN_ON(types & all_iftypes))
 636                                 return -EINVAL;
 637                         all_iftypes |= types;
 638
 639                         if (WARN_ON(!c->limits[j].max))
 640                                 return -EINVAL;
 641
 642                         /* Shouldn't list software iftypes in combinations! */
 643                         if (WARN_ON(wiphy->software_iftypes & types))
 644                                 return -EINVAL;
 645
 646                         /* Only a single P2P_DEVICE can be allowed */
 647                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 648                                     c->limits[j].max > 1))
 649                                 return -EINVAL;
 650
 651                         /* Only a single NAN can be allowed */
 652                         if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
 653                                     c->limits[j].max > 1))
 654                                 return -EINVAL;
 655
 656                         /*
 657                          * This isn't well-defined right now. If you have an
 658                          * IBSS interface, then its beacon interval may change
 659                          * by joining other networks, and nothing prevents it
 660                          * from doing that.
 661                          * So technically we probably shouldn't even allow AP
 662                          * and IBSS in the same interface, but it seems that
 663                          * some drivers support that, possibly only with fixed
 664                          * beacon intervals for IBSS.
 665                          */
 666                         if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
 667                                     c->beacon_int_min_gcd)) {
 668                                 return -EINVAL;
 669                         }
 670
 671                         cnt += c->limits[j].max;
 672                         /*
 673                          * Don't advertise an unsupported type
 674                          * in a combination.
 675                          */
 676                         if (WARN_ON((wiphy->interface_modes & types) != types))
 677                                 return -EINVAL;
 678                 }
 679
 680                 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
 681                         return -EINVAL;
 682
 683                 /* You can't even choose that many! */
 684                 if (WARN_ON(cnt < c->max_interfaces))
 685                         return -EINVAL;
 686         }
 687
 688         return 0;
 689 }
 690
 691 int wiphy_register(struct wiphy *wiphy)
 692 {
 693         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 694         int res;
 695         enum nl80211_band band;
 696         struct ieee80211_supported_band *sband;
 697         bool have_band = false;
 698         int i;
 699         u16 ifmodes = wiphy->interface_modes;
 700
 701 #ifdef CONFIG_PM
 702         if (WARN_ON(wiphy->wowlan &&
 703                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 704                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 705                 return -EINVAL;
 706         if (WARN_ON(wiphy->wowlan &&
 707                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 708                     !wiphy->wowlan->tcp))
 709                 return -EINVAL;
 710 #endif
 711         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 712                     (!rdev->ops->tdls_channel_switch ||
 713                      !rdev->ops->tdls_cancel_channel_switch)))
 714                 return -EINVAL;
 715
 716         if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
 717                     (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
 718                      !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
 719                      !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
 720                 return -EINVAL;
 721
 722         if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
 723                 return -EINVAL;
 724
 725         if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
 726                 return -EINVAL;
 727
 728         if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
 729                 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
 730                             !wiphy->pmsr_capa->ftm.non_asap))
 731                         return -EINVAL;
 732                 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
 733                             !wiphy->pmsr_capa->ftm.bandwidths))
 734                         return -EINVAL;
 735                 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
 736                                 ~(BIT(NL80211_PREAMBLE_LEGACY) |
 737                                   BIT(NL80211_PREAMBLE_HT) |
 738                                   BIT(NL80211_PREAMBLE_VHT) |
 739                                   BIT(NL80211_PREAMBLE_HE) |
 740                                   BIT(NL80211_PREAMBLE_DMG))))
 741                         return -EINVAL;
 742                 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
 743                              wiphy->pmsr_capa->ftm.non_trigger_based) &&
 744                             !(wiphy->pmsr_capa->ftm.preambles &
 745                               BIT(NL80211_PREAMBLE_HE))))
 746                         return -EINVAL;
 747                 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
 748                                 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
 749                                   BIT(NL80211_CHAN_WIDTH_20) |
 750                                   BIT(NL80211_CHAN_WIDTH_40) |
 751                                   BIT(NL80211_CHAN_WIDTH_80) |
 752                                   BIT(NL80211_CHAN_WIDTH_80P80) |
 753                                   BIT(NL80211_CHAN_WIDTH_160) |
 754                                   BIT(NL80211_CHAN_WIDTH_5) |
 755                                   BIT(NL80211_CHAN_WIDTH_10))))
 756                         return -EINVAL;
 757         }
 758
 759         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 760                     (wiphy->regulatory_flags &
 761                                         (REGULATORY_CUSTOM_REG |
 762                                          REGULATORY_STRICT_REG |
 763                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 764                                          REGULATORY_COUNTRY_IE_IGNORE))))
 765                 return -EINVAL;
 766
 767         if (WARN_ON(wiphy->coalesce &&
 768                     (!wiphy->coalesce->n_rules ||
 769                      !wiphy->coalesce->n_patterns) &&
 770                     (!wiphy->coalesce->pattern_min_len ||
 771                      wiphy->coalesce->pattern_min_len >
 772                         wiphy->coalesce->pattern_max_len)))
 773                 return -EINVAL;
 774
 775         if (WARN_ON(wiphy->ap_sme_capa &&
 776                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 777                 return -EINVAL;
 778
 779         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 780                 return -EINVAL;
 781
 782         if (WARN_ON(wiphy->addresses &&
 783                     !is_zero_ether_addr(wiphy->perm_addr) &&
 784                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 785                            ETH_ALEN)))
 786                 return -EINVAL;
 787
 788         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 789                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 790                      !rdev->ops->set_mac_acl)))
 791                 return -EINVAL;
 792
 793         /* assure only valid behaviours are flagged by driver
 794          * hence subtract 2 as bit 0 is invalid.
 795          */
 796         if (WARN_ON(wiphy->bss_select_support &&
 797                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 798                 return -EINVAL;
 799
 800         if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
 801                                             NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
 802                     (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
 803                 return -EINVAL;
 804
 805         if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
 806                     rdev->ops->update_connect_params))
 807                 return -EINVAL;
 808
 809         if (wiphy->addresses)
 810                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 811
 812         /* sanity check ifmodes */
 813         WARN_ON(!ifmodes);
 814         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 815         if (WARN_ON(ifmodes != wiphy->interface_modes))
 816                 wiphy->interface_modes = ifmodes;
 817
 818         res = wiphy_verify_combinations(wiphy);
 819         if (res)
 820                 return res;
 821
 822         /* sanity check supported bands/channels */
 823         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 824                 const struct ieee80211_sband_iftype_data *iftd;
 825                 u16 types = 0;
 826                 bool have_he = false;
 827
 828                 sband = wiphy->bands[band];
 829                 if (!sband)
 830                         continue;
 831
 832                 sband->band = band;
 833                 if (WARN_ON(!sband->n_channels))
 834                         return -EINVAL;
 835                 /*
 836                  * on 60GHz or sub-1Ghz band, there are no legacy rates, so
 837                  * n_bitrates is 0
 838                  */
 839                 if (WARN_ON((band != NL80211_BAND_60GHZ &&
 840                              band != NL80211_BAND_S1GHZ) &&
 841                             !sband->n_bitrates))
 842                         return -EINVAL;
 843
 844                 if (WARN_ON(band == NL80211_BAND_6GHZ &&
 845                             (sband->ht_cap.ht_supported ||
 846                              sband->vht_cap.vht_supported)))
 847                         return -EINVAL;
 848
 849                 /*
 850                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 851                  * modify the sband's ht data even if the driver uses a
 852                  * global structure for that.
 853                  */
 854                 if (cfg80211_disable_40mhz_24ghz &&
 855                     band == NL80211_BAND_2GHZ &&
 856                     sband->ht_cap.ht_supported) {
 857                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 858                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 859                 }
 860
 861                 /*
 862                  * Since we use a u32 for rate bitmaps in
 863                  * ieee80211_get_response_rate, we cannot
 864                  * have more than 32 legacy rates.
 865                  */
 866                 if (WARN_ON(sband->n_bitrates > 32))
 867                         return -EINVAL;
 868
 869                 for (i = 0; i < sband->n_channels; i++) {
 870                         sband->channels[i].orig_flags =
 871                                 sband->channels[i].flags;
 872                         sband->channels[i].orig_mag = INT_MAX;
 873                         sband->channels[i].orig_mpwr =
 874                                 sband->channels[i].max_power;
 875                         sband->channels[i].band = band;
 876
 877                         if (WARN_ON(sband->channels[i].freq_offset >= 1000))
 878                                 return -EINVAL;
 879                 }
 880
 881                 for_each_sband_iftype_data(sband, i, iftd) {
 882                         bool has_ap, has_non_ap;
 883                         u32 ap_bits = BIT(NL80211_IFTYPE_AP) |
 884                                       BIT(NL80211_IFTYPE_P2P_GO);
 885
 886                         if (WARN_ON(!iftd->types_mask))
 887                                 return -EINVAL;
 888                         if (WARN_ON(types & iftd->types_mask))
 889                                 return -EINVAL;
 890
 891                         /* at least one piece of information must be present */
 892                         if (WARN_ON(!iftd->he_cap.has_he))
 893                                 return -EINVAL;
 894
 895                         types |= iftd->types_mask;
 896
 897                         if (i == 0)
 898                                 have_he = iftd->he_cap.has_he;
 899                         else
 900                                 have_he = have_he &&
 901                                           iftd->he_cap.has_he;
 902
 903                         has_ap = iftd->types_mask & ap_bits;
 904                         has_non_ap = iftd->types_mask & ~ap_bits;
 905
 906                         /*
 907                          * For EHT 20 MHz STA, the capabilities format differs
 908                          * but to simplify, don't check 20 MHz but rather check
 909                          * only if AP and non-AP were mentioned at the same time,
 910                          * reject if so.
 911                          */
 912                         if (WARN_ON(iftd->eht_cap.has_eht &&
 913                                     has_ap && has_non_ap))
 914                                 return -EINVAL;
 915                 }
 916
 917                 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
 918                         return -EINVAL;
 919
 920                 have_band = true;
 921         }
 922
 923         if (!have_band) {
 924                 WARN_ON(1);
 925                 return -EINVAL;
 926         }
 927
 928         for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
 929                 /*
 930                  * Validate we have a policy (can be explicitly set to
 931                  * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
 932                  * we have at least one of doit/dumpit.
 933                  */
 934                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
 935                         return -EINVAL;
 936                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
 937                             !rdev->wiphy.vendor_commands[i].dumpit))
 938                         return -EINVAL;
 939         }
 940
 941 #ifdef CONFIG_PM
 942         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 943                     (!rdev->wiphy.wowlan->pattern_min_len ||
 944                      rdev->wiphy.wowlan->pattern_min_len >
 945                                 rdev->wiphy.wowlan->pattern_max_len)))
 946                 return -EINVAL;
 947 #endif
 948
 949         if (!wiphy->max_num_akm_suites)
 950                 wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES;
 951         else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES ||
 952                  wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES)
 953                 return -EINVAL;
 954
 955         /* check and set up bitrates */
 956         ieee80211_set_bitrate_flags(wiphy);
 957
 958         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 959
 960         rtnl_lock();
 961         wiphy_lock(&rdev->wiphy);
 962         res = device_add(&rdev->wiphy.dev);
 963         if (res) {
 964                 wiphy_unlock(&rdev->wiphy);
 965                 rtnl_unlock();
 966                 return res;
 967         }
 968
 969         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 970         cfg80211_rdev_list_generation++;
 971
 972         /* add to debugfs */
 973         rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
 974                                                     ieee80211_debugfs_dir);
 975
 976         cfg80211_debugfs_rdev_add(rdev);
 977         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 978         wiphy_unlock(&rdev->wiphy);
 979
 980         /* set up regulatory info */
 981         wiphy_regulatory_register(wiphy);
 982
 983         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 984                 struct regulatory_request request;
 985
 986                 request.wiphy_idx = get_wiphy_idx(wiphy);
 987                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 988                 request.alpha2[0] = '9';
 989                 request.alpha2[1] = '9';
 990
 991                 nl80211_send_reg_change_event(&request);
 992         }
 993
 994         /* Check that nobody globally advertises any capabilities they do not
 995          * advertise on all possible interface types.
 996          */
 997         if (wiphy->extended_capabilities_len &&
 998             wiphy->num_iftype_ext_capab &&
 999             wiphy->iftype_ext_capab) {
1000                 u8 supported_on_all, j;
1001                 const struct wiphy_iftype_ext_capab *capab;
1002
1003                 capab = wiphy->iftype_ext_capab;
1004                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
1005                         if (capab[0].extended_capabilities_len > j)
1006                                 supported_on_all =
1007                                         capab[0].extended_capabilities[j];
1008                         else
1009                                 supported_on_all = 0x00;
1010                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
1011                                 if (j >= capab[i].extended_capabilities_len) {
1012                                         supported_on_all = 0x00;
1013                                         break;
1014                                 }
1015                                 supported_on_all &=
1016                                         capab[i].extended_capabilities[j];
1017                         }
1018                         if (WARN_ON(wiphy->extended_capabilities[j] &
1019                                     ~supported_on_all))
1020                                 break;
1021                 }
1022         }
1023
1024         rdev->wiphy.registered = true;
1025         rtnl_unlock();
1026
1027         res = rfkill_register(rdev->wiphy.rfkill);
1028         if (res) {
1029                 rfkill_destroy(rdev->wiphy.rfkill);
1030                 rdev->wiphy.rfkill = NULL;
1031                 wiphy_unregister(&rdev->wiphy);
1032                 return res;
1033         }
1034
1035         return 0;
1036 }
1037 EXPORT_SYMBOL(wiphy_register);
1038
1039 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
1040 {
1041         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1042
1043         if (!rdev->ops->rfkill_poll)
1044                 return;
1045         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
1046         rfkill_resume_polling(wiphy->rfkill);
1047 }
1048 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
1049
1050 void cfg80211_process_wiphy_works(struct cfg80211_registered_device *rdev,
1051                                   struct wiphy_work *end)
1052 {
1053         unsigned int runaway_limit = 100;
1054         unsigned long flags;
1055
1056         lockdep_assert_held(&rdev->wiphy.mtx);
1057
1058         spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1059         while (!list_empty(&rdev->wiphy_work_list)) {
1060                 struct wiphy_work *wk;
1061
1062                 wk = list_first_entry(&rdev->wiphy_work_list,
1063                                       struct wiphy_work, entry);
1064                 list_del_init(&wk->entry);
1065                 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1066
1067                 wk->func(&rdev->wiphy, wk);
1068
1069                 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1070
1071                 if (wk == end)
1072                         break;
1073
1074                 if (WARN_ON(--runaway_limit == 0))
1075                         INIT_LIST_HEAD(&rdev->wiphy_work_list);
1076         }
1077         spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1078 }
1079
1080 void wiphy_unregister(struct wiphy *wiphy)
1081 {
1082         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1083
1084         wait_event(rdev->dev_wait, ({
1085                 int __count;
1086                 wiphy_lock(&rdev->wiphy);
1087                 __count = rdev->opencount;
1088                 wiphy_unlock(&rdev->wiphy);
1089                 __count == 0; }));
1090
1091         if (rdev->wiphy.rfkill)
1092                 rfkill_unregister(rdev->wiphy.rfkill);
1093
1094         rtnl_lock();
1095         wiphy_lock(&rdev->wiphy);
1096         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1097         rdev->wiphy.registered = false;
1098
1099         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1100
1101         /*
1102          * First remove the hardware from everywhere, this makes
1103          * it impossible to find from userspace.
1104          */
1105         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1106         list_del_rcu(&rdev->list);
1107         synchronize_rcu();
1108
1109         /*
1110          * If this device got a regulatory hint tell core its
1111          * free to listen now to a new shiny device regulatory hint
1112          */
1113         wiphy_regulatory_deregister(wiphy);
1114
1115         cfg80211_rdev_list_generation++;
1116         device_del(&rdev->wiphy.dev);
1117
1118 #ifdef CONFIG_PM
1119         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1120                 rdev_set_wakeup(rdev, false);
1121 #endif
1122
1123         /* surely nothing is reachable now, clean up work */
1124         cfg80211_process_wiphy_works(rdev, NULL);
1125         wiphy_unlock(&rdev->wiphy);
1126         rtnl_unlock();
1127
1128         /* this has nothing to do now but make sure it's gone */
1129         cancel_work_sync(&rdev->wiphy_work);
1130
1131         cancel_work_sync(&rdev->conn_work);
1132         flush_work(&rdev->event_work);
1133         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1134         cancel_delayed_work_sync(&rdev->background_cac_done_wk);
1135         flush_work(&rdev->destroy_work);
1136         flush_work(&rdev->propagate_radar_detect_wk);
1137         flush_work(&rdev->propagate_cac_done_wk);
1138         flush_work(&rdev->mgmt_registrations_update_wk);
1139         flush_work(&rdev->background_cac_abort_wk);
1140
1141         cfg80211_rdev_free_wowlan(rdev);
1142         cfg80211_rdev_free_coalesce(rdev);
1143 }
1144 EXPORT_SYMBOL(wiphy_unregister);
1145
1146 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1147 {
1148         struct cfg80211_internal_bss *scan, *tmp;
1149         struct cfg80211_beacon_registration *reg, *treg;
1150         rfkill_destroy(rdev->wiphy.rfkill);
1151         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1152                 list_del(&reg->list);
1153                 kfree(reg);
1154         }
1155         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1156                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1157         mutex_destroy(&rdev->wiphy.mtx);
1158
1159         /*
1160          * The 'regd' can only be non-NULL if we never finished
1161          * initializing the wiphy and thus never went through the
1162          * unregister path - e.g. in failure scenarios. Thus, it
1163          * cannot have been visible to anyone if non-NULL, so we
1164          * can just free it here.
1165          */
1166         kfree(rcu_dereference_raw(rdev->wiphy.regd));
1167
1168         kfree(rdev);
1169 }
1170
1171 void wiphy_free(struct wiphy *wiphy)
1172 {
1173         put_device(&wiphy->dev);
1174 }
1175 EXPORT_SYMBOL(wiphy_free);
1176
1177 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
1178                                       enum rfkill_hard_block_reasons reason)
1179 {
1180         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1181
1182         if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason))
1183                 schedule_work(&rdev->rfkill_block);
1184 }
1185 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);
1186
1187 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
1188                                       bool unregister_netdev)
1189 {
1190         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1191         struct cfg80211_cqm_config *cqm_config;
1192         unsigned int link_id;
1193
1194         ASSERT_RTNL();
1195         lockdep_assert_held(&rdev->wiphy.mtx);
1196
1197         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1198
1199         wdev->registered = false;
1200
1201         if (wdev->netdev) {
1202                 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
1203                 if (unregister_netdev)
1204                         unregister_netdevice(wdev->netdev);
1205         }
1206
1207         list_del_rcu(&wdev->list);
1208         synchronize_net();
1209         rdev->devlist_generation++;
1210
1211         cfg80211_mlme_purge_registrations(wdev);
1212
1213         switch (wdev->iftype) {
1214         case NL80211_IFTYPE_P2P_DEVICE:
1215                 cfg80211_stop_p2p_device(rdev, wdev);
1216                 break;
1217         case NL80211_IFTYPE_NAN:
1218                 cfg80211_stop_nan(rdev, wdev);
1219                 break;
1220         default:
1221                 break;
1222         }
1223
1224 #ifdef CONFIG_CFG80211_WEXT
1225         kfree_sensitive(wdev->wext.keys);
1226         wdev->wext.keys = NULL;
1227 #endif
1228         wiphy_work_cancel(wdev->wiphy, &wdev->cqm_rssi_work);
1229         /* deleted from the list, so can't be found from nl80211 any more */
1230         cqm_config = rcu_access_pointer(wdev->cqm_config);
1231         kfree_rcu(cqm_config, rcu_head);
1232
1233         /*
1234          * Ensure that all events have been processed and
1235          * freed.
1236          */
1237         cfg80211_process_wdev_events(wdev);
1238
1239         if (wdev->iftype == NL80211_IFTYPE_STATION ||
1240             wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) {
1241                 for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) {
1242                         struct cfg80211_internal_bss *curbss;
1243
1244                         curbss = wdev->links[link_id].client.current_bss;
1245
1246                         if (WARN_ON(curbss)) {
1247                                 cfg80211_unhold_bss(curbss);
1248                                 cfg80211_put_bss(wdev->wiphy, &curbss->pub);
1249                                 wdev->links[link_id].client.current_bss = NULL;
1250                         }
1251                 }
1252         }
1253
1254         wdev->connected = false;
1255 }
1256
1257 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1258 {
1259         _cfg80211_unregister_wdev(wdev, true);
1260 }
1261 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1262
1263 static const struct device_type wiphy_type = {
1264         .name   = "wlan",
1265 };
1266
1267 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1268                                enum nl80211_iftype iftype, int num)
1269 {
1270         lockdep_assert_held(&rdev->wiphy.mtx);
1271
1272         rdev->num_running_ifaces += num;
1273         if (iftype == NL80211_IFTYPE_MONITOR)
1274                 rdev->num_running_monitor_ifaces += num;
1275 }
1276
1277 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1278                     struct wireless_dev *wdev)
1279 {
1280         struct net_device *dev = wdev->netdev;
1281         struct cfg80211_sched_scan_request *pos, *tmp;
1282
1283         lockdep_assert_held(&rdev->wiphy.mtx);
1284
1285         cfg80211_pmsr_wdev_down(wdev);
1286
1287         cfg80211_stop_background_radar_detection(wdev);
1288
1289         switch (wdev->iftype) {
1290         case NL80211_IFTYPE_ADHOC:
1291                 cfg80211_leave_ibss(rdev, dev, true);
1292                 break;
1293         case NL80211_IFTYPE_P2P_CLIENT:
1294         case NL80211_IFTYPE_STATION:
1295                 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1296                                          list) {
1297                         if (dev == pos->dev)
1298                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1299                 }
1300
1301 #ifdef CONFIG_CFG80211_WEXT
1302                 kfree(wdev->wext.ie);
1303                 wdev->wext.ie = NULL;
1304                 wdev->wext.ie_len = 0;
1305                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1306 #endif
1307                 cfg80211_disconnect(rdev, dev,
1308                                     WLAN_REASON_DEAUTH_LEAVING, true);
1309                 break;
1310         case NL80211_IFTYPE_MESH_POINT:
1311                 cfg80211_leave_mesh(rdev, dev);
1312                 break;
1313         case NL80211_IFTYPE_AP:
1314         case NL80211_IFTYPE_P2P_GO:
1315                 cfg80211_stop_ap(rdev, dev, -1, true);
1316                 break;
1317         case NL80211_IFTYPE_OCB:
1318                 cfg80211_leave_ocb(rdev, dev);
1319                 break;
1320         case NL80211_IFTYPE_P2P_DEVICE:
1321         case NL80211_IFTYPE_NAN:
1322                 /* cannot happen, has no netdev */
1323                 break;
1324         case NL80211_IFTYPE_AP_VLAN:
1325         case NL80211_IFTYPE_MONITOR:
1326                 /* nothing to do */
1327                 break;
1328         case NL80211_IFTYPE_UNSPECIFIED:
1329         case NL80211_IFTYPE_WDS:
1330         case NUM_NL80211_IFTYPES:
1331                 /* invalid */
1332                 break;
1333         }
1334 }
1335
1336 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1337                          gfp_t gfp)
1338 {
1339         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1340         struct cfg80211_event *ev;
1341         unsigned long flags;
1342
1343         trace_cfg80211_stop_iface(wiphy, wdev);
1344
1345         ev = kzalloc(sizeof(*ev), gfp);
1346         if (!ev)
1347                 return;
1348
1349         ev->type = EVENT_STOPPED;
1350
1351         spin_lock_irqsave(&wdev->event_lock, flags);
1352         list_add_tail(&ev->list, &wdev->event_list);
1353         spin_unlock_irqrestore(&wdev->event_lock, flags);
1354         queue_work(cfg80211_wq, &rdev->event_work);
1355 }
1356 EXPORT_SYMBOL(cfg80211_stop_iface);
1357
1358 void cfg80211_init_wdev(struct wireless_dev *wdev)
1359 {
1360         INIT_LIST_HEAD(&wdev->event_list);
1361         spin_lock_init(&wdev->event_lock);
1362         INIT_LIST_HEAD(&wdev->mgmt_registrations);
1363         INIT_LIST_HEAD(&wdev->pmsr_list);
1364         spin_lock_init(&wdev->pmsr_lock);
1365         INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1366
1367 #ifdef CONFIG_CFG80211_WEXT
1368         wdev->wext.default_key = -1;
1369         wdev->wext.default_mgmt_key = -1;
1370         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1371 #endif
1372
1373         wiphy_work_init(&wdev->cqm_rssi_work, cfg80211_cqm_rssi_notify_work);
1374
1375         if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1376                 wdev->ps = true;
1377         else
1378                 wdev->ps = false;
1379         /* allow mac80211 to determine the timeout */
1380         wdev->ps_timeout = -1;
1381
1382         if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1383              wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1384              wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1385                 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1386
1387         INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1388 }
1389
1390 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1391                             struct wireless_dev *wdev)
1392 {
1393         ASSERT_RTNL();
1394         lockdep_assert_held(&rdev->wiphy.mtx);
1395
1396         /*
1397          * We get here also when the interface changes network namespaces,
1398          * as it's registered into the new one, but we don't want it to
1399          * change ID in that case. Checking if the ID is already assigned
1400          * works, because 0 isn't considered a valid ID and the memory is
1401          * 0-initialized.
1402          */
1403         if (!wdev->identifier)
1404                 wdev->identifier = ++rdev->wdev_id;
1405         list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1406         rdev->devlist_generation++;
1407         wdev->registered = true;
1408
1409         if (wdev->netdev &&
1410             sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj,
1411                               "phy80211"))
1412                 pr_err("failed to add phy80211 symlink to netdev!\n");
1413
1414         nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1415 }
1416
1417 int cfg80211_register_netdevice(struct net_device *dev)
1418 {
1419         struct wireless_dev *wdev = dev->ieee80211_ptr;
1420         struct cfg80211_registered_device *rdev;
1421         int ret;
1422
1423         ASSERT_RTNL();
1424
1425         if (WARN_ON(!wdev))
1426                 return -EINVAL;
1427
1428         rdev = wiphy_to_rdev(wdev->wiphy);
1429
1430         lockdep_assert_held(&rdev->wiphy.mtx);
1431
1432         /* we'll take care of this */
1433         wdev->registered = true;
1434         wdev->registering = true;
1435         ret = register_netdevice(dev);
1436         if (ret)
1437                 goto out;
1438
1439         cfg80211_register_wdev(rdev, wdev);
1440         ret = 0;
1441 out:
1442         wdev->registering = false;
1443         if (ret)
1444                 wdev->registered = false;
1445         return ret;
1446 }
1447 EXPORT_SYMBOL(cfg80211_register_netdevice);
1448
1449 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1450                                          unsigned long state, void *ptr)
1451 {
1452         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1453         struct wireless_dev *wdev = dev->ieee80211_ptr;
1454         struct cfg80211_registered_device *rdev;
1455         struct cfg80211_sched_scan_request *pos, *tmp;
1456
1457         if (!wdev)
1458                 return NOTIFY_DONE;
1459
1460         rdev = wiphy_to_rdev(wdev->wiphy);
1461
1462         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1463
1464         switch (state) {
1465         case NETDEV_POST_INIT:
1466                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1467                 wdev->netdev = dev;
1468                 /* can only change netns with wiphy */
1469                 dev->features |= NETIF_F_NETNS_LOCAL;
1470
1471                 cfg80211_init_wdev(wdev);
1472                 break;
1473         case NETDEV_REGISTER:
1474                 if (!wdev->registered) {
1475                         wiphy_lock(&rdev->wiphy);
1476                         cfg80211_register_wdev(rdev, wdev);
1477                         wiphy_unlock(&rdev->wiphy);
1478                 }
1479                 break;
1480         case NETDEV_UNREGISTER:
1481                 /*
1482                  * It is possible to get NETDEV_UNREGISTER multiple times,
1483                  * so check wdev->registered.
1484                  */
1485                 if (wdev->registered && !wdev->registering) {
1486                         wiphy_lock(&rdev->wiphy);
1487                         _cfg80211_unregister_wdev(wdev, false);
1488                         wiphy_unlock(&rdev->wiphy);
1489                 }
1490                 break;
1491         case NETDEV_GOING_DOWN:
1492                 wiphy_lock(&rdev->wiphy);
1493                 cfg80211_leave(rdev, wdev);
1494                 cfg80211_remove_links(wdev);
1495                 wiphy_unlock(&rdev->wiphy);
1496                 /* since we just did cfg80211_leave() nothing to do there */
1497                 cancel_work_sync(&wdev->disconnect_wk);
1498                 cancel_work_sync(&wdev->pmsr_free_wk);
1499                 break;
1500         case NETDEV_DOWN:
1501                 wiphy_lock(&rdev->wiphy);
1502                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1503                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1504                         if (WARN_ON(!rdev->scan_req->notified &&
1505                                     (!rdev->int_scan_req ||
1506                                      !rdev->int_scan_req->notified)))
1507                                 rdev->scan_req->info.aborted = true;
1508                         ___cfg80211_scan_done(rdev, false);
1509                 }
1510
1511                 list_for_each_entry_safe(pos, tmp,
1512                                          &rdev->sched_scan_req_list, list) {
1513                         if (WARN_ON(pos->dev == wdev->netdev))
1514                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1515                 }
1516
1517                 rdev->opencount--;
1518                 wiphy_unlock(&rdev->wiphy);
1519                 wake_up(&rdev->dev_wait);
1520                 break;
1521         case NETDEV_UP:
1522                 wiphy_lock(&rdev->wiphy);
1523                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1524                 switch (wdev->iftype) {
1525 #ifdef CONFIG_CFG80211_WEXT
1526                 case NL80211_IFTYPE_ADHOC:
1527                         cfg80211_ibss_wext_join(rdev, wdev);
1528                         break;
1529                 case NL80211_IFTYPE_STATION:
1530                         cfg80211_mgd_wext_connect(rdev, wdev);
1531                         break;
1532 #endif
1533 #ifdef CONFIG_MAC80211_MESH
1534                 case NL80211_IFTYPE_MESH_POINT:
1535                         {
1536                                 /* backward compat code... */
1537                                 struct mesh_setup setup;
1538                                 memcpy(&setup, &default_mesh_setup,
1539                                                 sizeof(setup));
1540                                  /* back compat only needed for mesh_id */
1541                                 setup.mesh_id = wdev->u.mesh.id;
1542                                 setup.mesh_id_len = wdev->u.mesh.id_up_len;
1543                                 if (wdev->u.mesh.id_up_len)
1544                                         __cfg80211_join_mesh(rdev, dev,
1545                                                         &setup,
1546                                                         &default_mesh_config);
1547                                 break;
1548                         }
1549 #endif
1550                 default:
1551                         break;
1552                 }
1553                 rdev->opencount++;
1554
1555                 /*
1556                  * Configure power management to the driver here so that its
1557                  * correctly set also after interface type changes etc.
1558                  */
1559                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1560                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1561                     rdev->ops->set_power_mgmt &&
1562                     rdev_set_power_mgmt(rdev, dev, wdev->ps,
1563                                         wdev->ps_timeout)) {
1564                         /* assume this means it's off */
1565                         wdev->ps = false;
1566                 }
1567                 wiphy_unlock(&rdev->wiphy);
1568                 break;
1569         case NETDEV_PRE_UP:
1570                 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1571                                              wdev->use_4addr, 0))
1572                         return notifier_from_errno(-EOPNOTSUPP);
1573
1574                 if (rfkill_blocked(rdev->wiphy.rfkill))
1575                         return notifier_from_errno(-ERFKILL);
1576                 break;
1577         default:
1578                 return NOTIFY_DONE;
1579         }
1580
1581         wireless_nlevent_flush();
1582
1583         return NOTIFY_OK;
1584 }
1585
1586 static struct notifier_block cfg80211_netdev_notifier = {
1587         .notifier_call = cfg80211_netdev_notifier_call,
1588 };
1589
1590 static void __net_exit cfg80211_pernet_exit(struct net *net)
1591 {
1592         struct cfg80211_registered_device *rdev;
1593
1594         rtnl_lock();
1595         for_each_rdev(rdev) {
1596                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1597                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1598         }
1599         rtnl_unlock();
1600 }
1601
1602 static struct pernet_operations cfg80211_pernet_ops = {
1603         .exit = cfg80211_pernet_exit,
1604 };
1605
1606 void wiphy_work_queue(struct wiphy *wiphy, struct wiphy_work *work)
1607 {
1608         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1609         unsigned long flags;
1610
1611         spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1612         if (list_empty(&work->entry))
1613                 list_add_tail(&work->entry, &rdev->wiphy_work_list);
1614         spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1615
1616         schedule_work(&rdev->wiphy_work);
1617 }
1618 EXPORT_SYMBOL_GPL(wiphy_work_queue);
1619
1620 void wiphy_work_cancel(struct wiphy *wiphy, struct wiphy_work *work)
1621 {
1622         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1623         unsigned long flags;
1624
1625         lockdep_assert_held(&wiphy->mtx);
1626
1627         spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1628         if (!list_empty(&work->entry))
1629                 list_del_init(&work->entry);
1630         spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1631 }
1632 EXPORT_SYMBOL_GPL(wiphy_work_cancel);
1633
1634 void wiphy_work_flush(struct wiphy *wiphy, struct wiphy_work *work)
1635 {
1636         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1637         unsigned long flags;
1638         bool run;
1639
1640         spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1641         run = !work || !list_empty(&work->entry);
1642         spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1643
1644         if (run)
1645                 cfg80211_process_wiphy_works(rdev, work);
1646 }
1647 EXPORT_SYMBOL_GPL(wiphy_work_flush);
1648
1649 void wiphy_delayed_work_timer(struct timer_list *t)
1650 {
1651         struct wiphy_delayed_work *dwork = from_timer(dwork, t, timer);
1652
1653         wiphy_work_queue(dwork->wiphy, &dwork->work);
1654 }
1655 EXPORT_SYMBOL(wiphy_delayed_work_timer);
1656
1657 void wiphy_delayed_work_queue(struct wiphy *wiphy,
1658                               struct wiphy_delayed_work *dwork,
1659                               unsigned long delay)
1660 {
1661         if (!delay) {
1662                 wiphy_work_queue(wiphy, &dwork->work);
1663                 return;
1664         }
1665
1666         dwork->wiphy = wiphy;
1667         mod_timer(&dwork->timer, jiffies + delay);
1668 }
1669 EXPORT_SYMBOL_GPL(wiphy_delayed_work_queue);
1670
1671 void wiphy_delayed_work_cancel(struct wiphy *wiphy,
1672                                struct wiphy_delayed_work *dwork)
1673 {
1674         lockdep_assert_held(&wiphy->mtx);
1675
1676         del_timer_sync(&dwork->timer);
1677         wiphy_work_cancel(wiphy, &dwork->work);
1678 }
1679 EXPORT_SYMBOL_GPL(wiphy_delayed_work_cancel);
1680
1681 void wiphy_delayed_work_flush(struct wiphy *wiphy,
1682                               struct wiphy_delayed_work *dwork)
1683 {
1684         lockdep_assert_held(&wiphy->mtx);
1685
1686         del_timer_sync(&dwork->timer);
1687         wiphy_work_flush(wiphy, &dwork->work);
1688 }
1689 EXPORT_SYMBOL_GPL(wiphy_delayed_work_flush);
1690
1691 static int __init cfg80211_init(void)
1692 {
1693         int err;
1694
1695         err = register_pernet_device(&cfg80211_pernet_ops);
1696         if (err)
1697                 goto out_fail_pernet;
1698
1699         err = wiphy_sysfs_init();
1700         if (err)
1701                 goto out_fail_sysfs;
1702
1703         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1704         if (err)
1705                 goto out_fail_notifier;
1706
1707         err = nl80211_init();
1708         if (err)
1709                 goto out_fail_nl80211;
1710
1711         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1712
1713         err = regulatory_init();
1714         if (err)
1715                 goto out_fail_reg;
1716
1717         cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1718         if (!cfg80211_wq) {
1719                 err = -ENOMEM;
1720                 goto out_fail_wq;
1721         }
1722
1723         return 0;
1724
1725 out_fail_wq:
1726         regulatory_exit();
1727 out_fail_reg:
1728         debugfs_remove(ieee80211_debugfs_dir);
1729         nl80211_exit();
1730 out_fail_nl80211:
1731         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1732 out_fail_notifier:
1733         wiphy_sysfs_exit();
1734 out_fail_sysfs:
1735         unregister_pernet_device(&cfg80211_pernet_ops);
1736 out_fail_pernet:
1737         return err;
1738 }
1739 fs_initcall(cfg80211_init);
1740
1741 static void __exit cfg80211_exit(void)
1742 {
1743         debugfs_remove(ieee80211_debugfs_dir);
1744         nl80211_exit();
1745         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1746         wiphy_sysfs_exit();
1747         regulatory_exit();
1748         unregister_pernet_device(&cfg80211_pernet_ops);
1749         destroy_workqueue(cfg80211_wq);
1750 }
1751 module_exit(cfg80211_exit);