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         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         /*
 760          * if a wiphy has unsupported modes for regulatory channel enforcement,
 761          * opt-out of enforcement checking
 762          */
 763         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 764                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 765                                        BIT(NL80211_IFTYPE_AP) |
 766                                        BIT(NL80211_IFTYPE_MESH_POINT) |
 767                                        BIT(NL80211_IFTYPE_P2P_GO) |
 768                                        BIT(NL80211_IFTYPE_ADHOC) |
 769                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 770                                        BIT(NL80211_IFTYPE_NAN) |
 771                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 772                                        BIT(NL80211_IFTYPE_MONITOR)))
 773                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 774
 775         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 776                     (wiphy->regulatory_flags &
 777                                         (REGULATORY_CUSTOM_REG |
 778                                          REGULATORY_STRICT_REG |
 779                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 780                                          REGULATORY_COUNTRY_IE_IGNORE))))
 781                 return -EINVAL;
 782
 783         if (WARN_ON(wiphy->coalesce &&
 784                     (!wiphy->coalesce->n_rules ||
 785                      !wiphy->coalesce->n_patterns) &&
 786                     (!wiphy->coalesce->pattern_min_len ||
 787                      wiphy->coalesce->pattern_min_len >
 788                         wiphy->coalesce->pattern_max_len)))
 789                 return -EINVAL;
 790
 791         if (WARN_ON(wiphy->ap_sme_capa &&
 792                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 793                 return -EINVAL;
 794
 795         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 796                 return -EINVAL;
 797
 798         if (WARN_ON(wiphy->addresses &&
 799                     !is_zero_ether_addr(wiphy->perm_addr) &&
 800                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 801                            ETH_ALEN)))
 802                 return -EINVAL;
 803
 804         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 805                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 806                      !rdev->ops->set_mac_acl)))
 807                 return -EINVAL;
 808
 809         /* assure only valid behaviours are flagged by driver
 810          * hence subtract 2 as bit 0 is invalid.
 811          */
 812         if (WARN_ON(wiphy->bss_select_support &&
 813                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 814                 return -EINVAL;
 815
 816         if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
 817                                             NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
 818                     (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
 819                 return -EINVAL;
 820
 821         if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
 822                     rdev->ops->update_connect_params))
 823                 return -EINVAL;
 824
 825         if (wiphy->addresses)
 826                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 827
 828         /* sanity check ifmodes */
 829         WARN_ON(!ifmodes);
 830         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 831         if (WARN_ON(ifmodes != wiphy->interface_modes))
 832                 wiphy->interface_modes = ifmodes;
 833
 834         res = wiphy_verify_combinations(wiphy);
 835         if (res)
 836                 return res;
 837
 838         /* sanity check supported bands/channels */
 839         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 840                 u16 types = 0;
 841                 bool have_he = false;
 842
 843                 sband = wiphy->bands[band];
 844                 if (!sband)
 845                         continue;
 846
 847                 sband->band = band;
 848                 if (WARN_ON(!sband->n_channels))
 849                         return -EINVAL;
 850                 /*
 851                  * on 60GHz or sub-1Ghz band, there are no legacy rates, so
 852                  * n_bitrates is 0
 853                  */
 854                 if (WARN_ON((band != NL80211_BAND_60GHZ &&
 855                              band != NL80211_BAND_S1GHZ) &&
 856                             !sband->n_bitrates))
 857                         return -EINVAL;
 858
 859                 if (WARN_ON(band == NL80211_BAND_6GHZ &&
 860                             (sband->ht_cap.ht_supported ||
 861                              sband->vht_cap.vht_supported)))
 862                         return -EINVAL;
 863
 864                 /*
 865                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 866                  * modify the sband's ht data even if the driver uses a
 867                  * global structure for that.
 868                  */
 869                 if (cfg80211_disable_40mhz_24ghz &&
 870                     band == NL80211_BAND_2GHZ &&
 871                     sband->ht_cap.ht_supported) {
 872                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 873                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 874                 }
 875
 876                 /*
 877                  * Since we use a u32 for rate bitmaps in
 878                  * ieee80211_get_response_rate, we cannot
 879                  * have more than 32 legacy rates.
 880                  */
 881                 if (WARN_ON(sband->n_bitrates > 32))
 882                         return -EINVAL;
 883
 884                 for (i = 0; i < sband->n_channels; i++) {
 885                         sband->channels[i].orig_flags =
 886                                 sband->channels[i].flags;
 887                         sband->channels[i].orig_mag = INT_MAX;
 888                         sband->channels[i].orig_mpwr =
 889                                 sband->channels[i].max_power;
 890                         sband->channels[i].band = band;
 891
 892                         if (WARN_ON(sband->channels[i].freq_offset >= 1000))
 893                                 return -EINVAL;
 894                 }
 895
 896                 for (i = 0; i < sband->n_iftype_data; i++) {
 897                         const struct ieee80211_sband_iftype_data *iftd;
 898                         bool has_ap, has_non_ap;
 899                         u32 ap_bits = BIT(NL80211_IFTYPE_AP) |
 900                                       BIT(NL80211_IFTYPE_P2P_GO);
 901
 902                         iftd = &sband->iftype_data[i];
 903
 904                         if (WARN_ON(!iftd->types_mask))
 905                                 return -EINVAL;
 906                         if (WARN_ON(types & iftd->types_mask))
 907                                 return -EINVAL;
 908
 909                         /* at least one piece of information must be present */
 910                         if (WARN_ON(!iftd->he_cap.has_he))
 911                                 return -EINVAL;
 912
 913                         types |= iftd->types_mask;
 914
 915                         if (i == 0)
 916                                 have_he = iftd->he_cap.has_he;
 917                         else
 918                                 have_he = have_he &&
 919                                           iftd->he_cap.has_he;
 920
 921                         has_ap = iftd->types_mask & ap_bits;
 922                         has_non_ap = iftd->types_mask & ~ap_bits;
 923
 924                         /*
 925                          * For EHT 20 MHz STA, the capabilities format differs
 926                          * but to simplify, don't check 20 MHz but rather check
 927                          * only if AP and non-AP were mentioned at the same time,
 928                          * reject if so.
 929                          */
 930                         if (WARN_ON(iftd->eht_cap.has_eht &&
 931                                     has_ap && has_non_ap))
 932                                 return -EINVAL;
 933                 }
 934
 935                 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
 936                         return -EINVAL;
 937
 938                 have_band = true;
 939         }
 940
 941         if (!have_band) {
 942                 WARN_ON(1);
 943                 return -EINVAL;
 944         }
 945
 946         for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
 947                 /*
 948                  * Validate we have a policy (can be explicitly set to
 949                  * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
 950                  * we have at least one of doit/dumpit.
 951                  */
 952                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
 953                         return -EINVAL;
 954                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
 955                             !rdev->wiphy.vendor_commands[i].dumpit))
 956                         return -EINVAL;
 957         }
 958
 959 #ifdef CONFIG_PM
 960         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 961                     (!rdev->wiphy.wowlan->pattern_min_len ||
 962                      rdev->wiphy.wowlan->pattern_min_len >
 963                                 rdev->wiphy.wowlan->pattern_max_len)))
 964                 return -EINVAL;
 965 #endif
 966
 967         if (!wiphy->max_num_akm_suites)
 968                 wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES;
 969         else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES ||
 970                  wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES)
 971                 return -EINVAL;
 972
 973         /* check and set up bitrates */
 974         ieee80211_set_bitrate_flags(wiphy);
 975
 976         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 977
 978         rtnl_lock();
 979         wiphy_lock(&rdev->wiphy);
 980         res = device_add(&rdev->wiphy.dev);
 981         if (res) {
 982                 wiphy_unlock(&rdev->wiphy);
 983                 rtnl_unlock();
 984                 return res;
 985         }
 986
 987         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 988         cfg80211_rdev_list_generation++;
 989
 990         /* add to debugfs */
 991         rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
 992                                                     ieee80211_debugfs_dir);
 993
 994         cfg80211_debugfs_rdev_add(rdev);
 995         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 996         wiphy_unlock(&rdev->wiphy);
 997
 998         /* set up regulatory info */
 999         wiphy_regulatory_register(wiphy);
1000
1001         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
1002                 struct regulatory_request request;
1003
1004                 request.wiphy_idx = get_wiphy_idx(wiphy);
1005                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
1006                 request.alpha2[0] = '9';
1007                 request.alpha2[1] = '9';
1008
1009                 nl80211_send_reg_change_event(&request);
1010         }
1011
1012         /* Check that nobody globally advertises any capabilities they do not
1013          * advertise on all possible interface types.
1014          */
1015         if (wiphy->extended_capabilities_len &&
1016             wiphy->num_iftype_ext_capab &&
1017             wiphy->iftype_ext_capab) {
1018                 u8 supported_on_all, j;
1019                 const struct wiphy_iftype_ext_capab *capab;
1020
1021                 capab = wiphy->iftype_ext_capab;
1022                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
1023                         if (capab[0].extended_capabilities_len > j)
1024                                 supported_on_all =
1025                                         capab[0].extended_capabilities[j];
1026                         else
1027                                 supported_on_all = 0x00;
1028                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
1029                                 if (j >= capab[i].extended_capabilities_len) {
1030                                         supported_on_all = 0x00;
1031                                         break;
1032                                 }
1033                                 supported_on_all &=
1034                                         capab[i].extended_capabilities[j];
1035                         }
1036                         if (WARN_ON(wiphy->extended_capabilities[j] &
1037                                     ~supported_on_all))
1038                                 break;
1039                 }
1040         }
1041
1042         rdev->wiphy.registered = true;
1043         rtnl_unlock();
1044
1045         res = rfkill_register(rdev->wiphy.rfkill);
1046         if (res) {
1047                 rfkill_destroy(rdev->wiphy.rfkill);
1048                 rdev->wiphy.rfkill = NULL;
1049                 wiphy_unregister(&rdev->wiphy);
1050                 return res;
1051         }
1052
1053         return 0;
1054 }
1055 EXPORT_SYMBOL(wiphy_register);
1056
1057 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
1058 {
1059         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1060
1061         if (!rdev->ops->rfkill_poll)
1062                 return;
1063         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
1064         rfkill_resume_polling(wiphy->rfkill);
1065 }
1066 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
1067
1068 void cfg80211_process_wiphy_works(struct cfg80211_registered_device *rdev)
1069 {
1070         unsigned int runaway_limit = 100;
1071         unsigned long flags;
1072
1073         lockdep_assert_held(&rdev->wiphy.mtx);
1074
1075         spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1076         while (!list_empty(&rdev->wiphy_work_list)) {
1077                 struct wiphy_work *wk;
1078
1079                 wk = list_first_entry(&rdev->wiphy_work_list,
1080                                       struct wiphy_work, entry);
1081                 list_del_init(&wk->entry);
1082                 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1083
1084                 wk->func(&rdev->wiphy, wk);
1085
1086                 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1087                 if (WARN_ON(--runaway_limit == 0))
1088                         INIT_LIST_HEAD(&rdev->wiphy_work_list);
1089         }
1090         spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1091 }
1092
1093 void wiphy_unregister(struct wiphy *wiphy)
1094 {
1095         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1096
1097         wait_event(rdev->dev_wait, ({
1098                 int __count;
1099                 wiphy_lock(&rdev->wiphy);
1100                 __count = rdev->opencount;
1101                 wiphy_unlock(&rdev->wiphy);
1102                 __count == 0; }));
1103
1104         if (rdev->wiphy.rfkill)
1105                 rfkill_unregister(rdev->wiphy.rfkill);
1106
1107         rtnl_lock();
1108         wiphy_lock(&rdev->wiphy);
1109         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1110         rdev->wiphy.registered = false;
1111
1112         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1113
1114         /*
1115          * First remove the hardware from everywhere, this makes
1116          * it impossible to find from userspace.
1117          */
1118         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1119         list_del_rcu(&rdev->list);
1120         synchronize_rcu();
1121
1122         /*
1123          * If this device got a regulatory hint tell core its
1124          * free to listen now to a new shiny device regulatory hint
1125          */
1126         wiphy_regulatory_deregister(wiphy);
1127
1128         cfg80211_rdev_list_generation++;
1129         device_del(&rdev->wiphy.dev);
1130
1131 #ifdef CONFIG_PM
1132         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1133                 rdev_set_wakeup(rdev, false);
1134 #endif
1135
1136         /* surely nothing is reachable now, clean up work */
1137         cfg80211_process_wiphy_works(rdev);
1138         wiphy_unlock(&rdev->wiphy);
1139         rtnl_unlock();
1140
1141         /* this has nothing to do now but make sure it's gone */
1142         cancel_work_sync(&rdev->wiphy_work);
1143
1144         cancel_work_sync(&rdev->conn_work);
1145         flush_work(&rdev->event_work);
1146         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1147         cancel_delayed_work_sync(&rdev->background_cac_done_wk);
1148         flush_work(&rdev->destroy_work);
1149         flush_work(&rdev->propagate_radar_detect_wk);
1150         flush_work(&rdev->propagate_cac_done_wk);
1151         flush_work(&rdev->mgmt_registrations_update_wk);
1152         flush_work(&rdev->background_cac_abort_wk);
1153
1154         cfg80211_rdev_free_wowlan(rdev);
1155         cfg80211_rdev_free_coalesce(rdev);
1156 }
1157 EXPORT_SYMBOL(wiphy_unregister);
1158
1159 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1160 {
1161         struct cfg80211_internal_bss *scan, *tmp;
1162         struct cfg80211_beacon_registration *reg, *treg;
1163         rfkill_destroy(rdev->wiphy.rfkill);
1164         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1165                 list_del(&reg->list);
1166                 kfree(reg);
1167         }
1168         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1169                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1170         mutex_destroy(&rdev->wiphy.mtx);
1171
1172         /*
1173          * The 'regd' can only be non-NULL if we never finished
1174          * initializing the wiphy and thus never went through the
1175          * unregister path - e.g. in failure scenarios. Thus, it
1176          * cannot have been visible to anyone if non-NULL, so we
1177          * can just free it here.
1178          */
1179         kfree(rcu_dereference_raw(rdev->wiphy.regd));
1180
1181         kfree(rdev);
1182 }
1183
1184 void wiphy_free(struct wiphy *wiphy)
1185 {
1186         put_device(&wiphy->dev);
1187 }
1188 EXPORT_SYMBOL(wiphy_free);
1189
1190 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
1191                                       enum rfkill_hard_block_reasons reason)
1192 {
1193         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1194
1195         if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason))
1196                 schedule_work(&rdev->rfkill_block);
1197 }
1198 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);
1199
1200 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1201 {
1202         kfree(wdev->cqm_config);
1203         wdev->cqm_config = NULL;
1204 }
1205
1206 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
1207                                       bool unregister_netdev)
1208 {
1209         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1210         unsigned int link_id;
1211
1212         ASSERT_RTNL();
1213         lockdep_assert_held(&rdev->wiphy.mtx);
1214
1215         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1216
1217         wdev->registered = false;
1218
1219         if (wdev->netdev) {
1220                 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
1221                 if (unregister_netdev)
1222                         unregister_netdevice(wdev->netdev);
1223         }
1224
1225         list_del_rcu(&wdev->list);
1226         synchronize_net();
1227         rdev->devlist_generation++;
1228
1229         cfg80211_mlme_purge_registrations(wdev);
1230
1231         switch (wdev->iftype) {
1232         case NL80211_IFTYPE_P2P_DEVICE:
1233                 cfg80211_stop_p2p_device(rdev, wdev);
1234                 break;
1235         case NL80211_IFTYPE_NAN:
1236                 cfg80211_stop_nan(rdev, wdev);
1237                 break;
1238         default:
1239                 break;
1240         }
1241
1242 #ifdef CONFIG_CFG80211_WEXT
1243         kfree_sensitive(wdev->wext.keys);
1244         wdev->wext.keys = NULL;
1245 #endif
1246         cfg80211_cqm_config_free(wdev);
1247
1248         /*
1249          * Ensure that all events have been processed and
1250          * freed.
1251          */
1252         cfg80211_process_wdev_events(wdev);
1253
1254         if (wdev->iftype == NL80211_IFTYPE_STATION ||
1255             wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) {
1256                 for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) {
1257                         struct cfg80211_internal_bss *curbss;
1258
1259                         curbss = wdev->links[link_id].client.current_bss;
1260
1261                         if (WARN_ON(curbss)) {
1262                                 cfg80211_unhold_bss(curbss);
1263                                 cfg80211_put_bss(wdev->wiphy, &curbss->pub);
1264                                 wdev->links[link_id].client.current_bss = NULL;
1265                         }
1266                 }
1267         }
1268
1269         wdev->connected = false;
1270 }
1271
1272 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1273 {
1274         _cfg80211_unregister_wdev(wdev, true);
1275 }
1276 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1277
1278 static const struct device_type wiphy_type = {
1279         .name   = "wlan",
1280 };
1281
1282 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1283                                enum nl80211_iftype iftype, int num)
1284 {
1285         lockdep_assert_held(&rdev->wiphy.mtx);
1286
1287         rdev->num_running_ifaces += num;
1288         if (iftype == NL80211_IFTYPE_MONITOR)
1289                 rdev->num_running_monitor_ifaces += num;
1290 }
1291
1292 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1293                       struct wireless_dev *wdev)
1294 {
1295         struct net_device *dev = wdev->netdev;
1296         struct cfg80211_sched_scan_request *pos, *tmp;
1297
1298         lockdep_assert_held(&rdev->wiphy.mtx);
1299         ASSERT_WDEV_LOCK(wdev);
1300
1301         cfg80211_pmsr_wdev_down(wdev);
1302
1303         cfg80211_stop_background_radar_detection(wdev);
1304
1305         switch (wdev->iftype) {
1306         case NL80211_IFTYPE_ADHOC:
1307                 __cfg80211_leave_ibss(rdev, dev, true);
1308                 break;
1309         case NL80211_IFTYPE_P2P_CLIENT:
1310         case NL80211_IFTYPE_STATION:
1311                 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1312                                          list) {
1313                         if (dev == pos->dev)
1314                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1315                 }
1316
1317 #ifdef CONFIG_CFG80211_WEXT
1318                 kfree(wdev->wext.ie);
1319                 wdev->wext.ie = NULL;
1320                 wdev->wext.ie_len = 0;
1321                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1322 #endif
1323                 cfg80211_disconnect(rdev, dev,
1324                                     WLAN_REASON_DEAUTH_LEAVING, true);
1325                 break;
1326         case NL80211_IFTYPE_MESH_POINT:
1327                 __cfg80211_leave_mesh(rdev, dev);
1328                 break;
1329         case NL80211_IFTYPE_AP:
1330         case NL80211_IFTYPE_P2P_GO:
1331                 __cfg80211_stop_ap(rdev, dev, -1, true);
1332                 break;
1333         case NL80211_IFTYPE_OCB:
1334                 __cfg80211_leave_ocb(rdev, dev);
1335                 break;
1336         case NL80211_IFTYPE_P2P_DEVICE:
1337         case NL80211_IFTYPE_NAN:
1338                 /* cannot happen, has no netdev */
1339                 break;
1340         case NL80211_IFTYPE_AP_VLAN:
1341         case NL80211_IFTYPE_MONITOR:
1342                 /* nothing to do */
1343                 break;
1344         case NL80211_IFTYPE_UNSPECIFIED:
1345         case NL80211_IFTYPE_WDS:
1346         case NUM_NL80211_IFTYPES:
1347                 /* invalid */
1348                 break;
1349         }
1350 }
1351
1352 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1353                     struct wireless_dev *wdev)
1354 {
1355         wdev_lock(wdev);
1356         __cfg80211_leave(rdev, wdev);
1357         wdev_unlock(wdev);
1358 }
1359
1360 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1361                          gfp_t gfp)
1362 {
1363         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1364         struct cfg80211_event *ev;
1365         unsigned long flags;
1366
1367         trace_cfg80211_stop_iface(wiphy, wdev);
1368
1369         ev = kzalloc(sizeof(*ev), gfp);
1370         if (!ev)
1371                 return;
1372
1373         ev->type = EVENT_STOPPED;
1374
1375         spin_lock_irqsave(&wdev->event_lock, flags);
1376         list_add_tail(&ev->list, &wdev->event_list);
1377         spin_unlock_irqrestore(&wdev->event_lock, flags);
1378         queue_work(cfg80211_wq, &rdev->event_work);
1379 }
1380 EXPORT_SYMBOL(cfg80211_stop_iface);
1381
1382 void cfg80211_init_wdev(struct wireless_dev *wdev)
1383 {
1384         mutex_init(&wdev->mtx);
1385         INIT_LIST_HEAD(&wdev->event_list);
1386         spin_lock_init(&wdev->event_lock);
1387         INIT_LIST_HEAD(&wdev->mgmt_registrations);
1388         INIT_LIST_HEAD(&wdev->pmsr_list);
1389         spin_lock_init(&wdev->pmsr_lock);
1390         INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1391
1392 #ifdef CONFIG_CFG80211_WEXT
1393         wdev->wext.default_key = -1;
1394         wdev->wext.default_mgmt_key = -1;
1395         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1396 #endif
1397
1398         if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1399                 wdev->ps = true;
1400         else
1401                 wdev->ps = false;
1402         /* allow mac80211 to determine the timeout */
1403         wdev->ps_timeout = -1;
1404
1405         if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1406              wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1407              wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1408                 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1409
1410         INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1411 }
1412
1413 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1414                             struct wireless_dev *wdev)
1415 {
1416         ASSERT_RTNL();
1417         lockdep_assert_held(&rdev->wiphy.mtx);
1418
1419         /*
1420          * We get here also when the interface changes network namespaces,
1421          * as it's registered into the new one, but we don't want it to
1422          * change ID in that case. Checking if the ID is already assigned
1423          * works, because 0 isn't considered a valid ID and the memory is
1424          * 0-initialized.
1425          */
1426         if (!wdev->identifier)
1427                 wdev->identifier = ++rdev->wdev_id;
1428         list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1429         rdev->devlist_generation++;
1430         wdev->registered = true;
1431
1432         if (wdev->netdev &&
1433             sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj,
1434                               "phy80211"))
1435                 pr_err("failed to add phy80211 symlink to netdev!\n");
1436
1437         nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1438 }
1439
1440 int cfg80211_register_netdevice(struct net_device *dev)
1441 {
1442         struct wireless_dev *wdev = dev->ieee80211_ptr;
1443         struct cfg80211_registered_device *rdev;
1444         int ret;
1445
1446         ASSERT_RTNL();
1447
1448         if (WARN_ON(!wdev))
1449                 return -EINVAL;
1450
1451         rdev = wiphy_to_rdev(wdev->wiphy);
1452
1453         lockdep_assert_held(&rdev->wiphy.mtx);
1454
1455         /* we'll take care of this */
1456         wdev->registered = true;
1457         wdev->registering = true;
1458         ret = register_netdevice(dev);
1459         if (ret)
1460                 goto out;
1461
1462         cfg80211_register_wdev(rdev, wdev);
1463         ret = 0;
1464 out:
1465         wdev->registering = false;
1466         if (ret)
1467                 wdev->registered = false;
1468         return ret;
1469 }
1470 EXPORT_SYMBOL(cfg80211_register_netdevice);
1471
1472 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1473                                          unsigned long state, void *ptr)
1474 {
1475         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1476         struct wireless_dev *wdev = dev->ieee80211_ptr;
1477         struct cfg80211_registered_device *rdev;
1478         struct cfg80211_sched_scan_request *pos, *tmp;
1479
1480         if (!wdev)
1481                 return NOTIFY_DONE;
1482
1483         rdev = wiphy_to_rdev(wdev->wiphy);
1484
1485         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1486
1487         switch (state) {
1488         case NETDEV_POST_INIT:
1489                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1490                 wdev->netdev = dev;
1491                 /* can only change netns with wiphy */
1492                 dev->features |= NETIF_F_NETNS_LOCAL;
1493
1494                 cfg80211_init_wdev(wdev);
1495                 break;
1496         case NETDEV_REGISTER:
1497                 if (!wdev->registered) {
1498                         wiphy_lock(&rdev->wiphy);
1499                         cfg80211_register_wdev(rdev, wdev);
1500                         wiphy_unlock(&rdev->wiphy);
1501                 }
1502                 break;
1503         case NETDEV_UNREGISTER:
1504                 /*
1505                  * It is possible to get NETDEV_UNREGISTER multiple times,
1506                  * so check wdev->registered.
1507                  */
1508                 if (wdev->registered && !wdev->registering) {
1509                         wiphy_lock(&rdev->wiphy);
1510                         _cfg80211_unregister_wdev(wdev, false);
1511                         wiphy_unlock(&rdev->wiphy);
1512                 }
1513                 break;
1514         case NETDEV_GOING_DOWN:
1515                 wiphy_lock(&rdev->wiphy);
1516                 cfg80211_leave(rdev, wdev);
1517                 cfg80211_remove_links(wdev);
1518                 wiphy_unlock(&rdev->wiphy);
1519                 /* since we just did cfg80211_leave() nothing to do there */
1520                 cancel_work_sync(&wdev->disconnect_wk);
1521                 cancel_work_sync(&wdev->pmsr_free_wk);
1522                 break;
1523         case NETDEV_DOWN:
1524                 wiphy_lock(&rdev->wiphy);
1525                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1526                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1527                         if (WARN_ON(!rdev->scan_req->notified &&
1528                                     (!rdev->int_scan_req ||
1529                                      !rdev->int_scan_req->notified)))
1530                                 rdev->scan_req->info.aborted = true;
1531                         ___cfg80211_scan_done(rdev, false);
1532                 }
1533
1534                 list_for_each_entry_safe(pos, tmp,
1535                                          &rdev->sched_scan_req_list, list) {
1536                         if (WARN_ON(pos->dev == wdev->netdev))
1537                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1538                 }
1539
1540                 rdev->opencount--;
1541                 wiphy_unlock(&rdev->wiphy);
1542                 wake_up(&rdev->dev_wait);
1543                 break;
1544         case NETDEV_UP:
1545                 wiphy_lock(&rdev->wiphy);
1546                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1547                 wdev_lock(wdev);
1548                 switch (wdev->iftype) {
1549 #ifdef CONFIG_CFG80211_WEXT
1550                 case NL80211_IFTYPE_ADHOC:
1551                         cfg80211_ibss_wext_join(rdev, wdev);
1552                         break;
1553                 case NL80211_IFTYPE_STATION:
1554                         cfg80211_mgd_wext_connect(rdev, wdev);
1555                         break;
1556 #endif
1557 #ifdef CONFIG_MAC80211_MESH
1558                 case NL80211_IFTYPE_MESH_POINT:
1559                         {
1560                                 /* backward compat code... */
1561                                 struct mesh_setup setup;
1562                                 memcpy(&setup, &default_mesh_setup,
1563                                                 sizeof(setup));
1564                                  /* back compat only needed for mesh_id */
1565                                 setup.mesh_id = wdev->u.mesh.id;
1566                                 setup.mesh_id_len = wdev->u.mesh.id_up_len;
1567                                 if (wdev->u.mesh.id_up_len)
1568                                         __cfg80211_join_mesh(rdev, dev,
1569                                                         &setup,
1570                                                         &default_mesh_config);
1571                                 break;
1572                         }
1573 #endif
1574                 default:
1575                         break;
1576                 }
1577                 wdev_unlock(wdev);
1578                 rdev->opencount++;
1579
1580                 /*
1581                  * Configure power management to the driver here so that its
1582                  * correctly set also after interface type changes etc.
1583                  */
1584                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1585                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1586                     rdev->ops->set_power_mgmt &&
1587                     rdev_set_power_mgmt(rdev, dev, wdev->ps,
1588                                         wdev->ps_timeout)) {
1589                         /* assume this means it's off */
1590                         wdev->ps = false;
1591                 }
1592                 wiphy_unlock(&rdev->wiphy);
1593                 break;
1594         case NETDEV_PRE_UP:
1595                 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1596                                              wdev->use_4addr, 0))
1597                         return notifier_from_errno(-EOPNOTSUPP);
1598
1599                 if (rfkill_blocked(rdev->wiphy.rfkill))
1600                         return notifier_from_errno(-ERFKILL);
1601                 break;
1602         default:
1603                 return NOTIFY_DONE;
1604         }
1605
1606         wireless_nlevent_flush();
1607
1608         return NOTIFY_OK;
1609 }
1610
1611 static struct notifier_block cfg80211_netdev_notifier = {
1612         .notifier_call = cfg80211_netdev_notifier_call,
1613 };
1614
1615 static void __net_exit cfg80211_pernet_exit(struct net *net)
1616 {
1617         struct cfg80211_registered_device *rdev;
1618
1619         rtnl_lock();
1620         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1621                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1622                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1623         }
1624         rtnl_unlock();
1625 }
1626
1627 static struct pernet_operations cfg80211_pernet_ops = {
1628         .exit = cfg80211_pernet_exit,
1629 };
1630
1631 void wiphy_work_queue(struct wiphy *wiphy, struct wiphy_work *work)
1632 {
1633         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1634         unsigned long flags;
1635
1636         spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1637         if (list_empty(&work->entry))
1638                 list_add_tail(&work->entry, &rdev->wiphy_work_list);
1639         spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1640
1641         schedule_work(&rdev->wiphy_work);
1642 }
1643 EXPORT_SYMBOL_GPL(wiphy_work_queue);
1644
1645 void wiphy_work_cancel(struct wiphy *wiphy, struct wiphy_work *work)
1646 {
1647         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1648         unsigned long flags;
1649
1650         lockdep_assert_held(&wiphy->mtx);
1651
1652         spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1653         if (!list_empty(&work->entry))
1654                 list_del_init(&work->entry);
1655         spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1656 }
1657 EXPORT_SYMBOL_GPL(wiphy_work_cancel);
1658
1659 void wiphy_delayed_work_timer(struct timer_list *t)
1660 {
1661         struct wiphy_delayed_work *dwork = from_timer(dwork, t, timer);
1662
1663         wiphy_work_queue(dwork->wiphy, &dwork->work);
1664 }
1665 EXPORT_SYMBOL(wiphy_delayed_work_timer);
1666
1667 void wiphy_delayed_work_queue(struct wiphy *wiphy,
1668                               struct wiphy_delayed_work *dwork,
1669                               unsigned long delay)
1670 {
1671         if (!delay) {
1672                 wiphy_work_queue(wiphy, &dwork->work);
1673                 return;
1674         }
1675
1676         dwork->wiphy = wiphy;
1677         mod_timer(&dwork->timer, jiffies + delay);
1678 }
1679 EXPORT_SYMBOL_GPL(wiphy_delayed_work_queue);
1680
1681 void wiphy_delayed_work_cancel(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_cancel(wiphy, &dwork->work);
1688 }
1689 EXPORT_SYMBOL_GPL(wiphy_delayed_work_cancel);
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);