wireless/core.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * This is the linux wireless configuration interface.
   4  *
   5  * Copyright 2006-2010          Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  * Copyright 2015-2017  Intel Deutschland GmbH
   8  * Copyright (C) 2018-2022 Intel Corporation
   9  */
  10
  11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  12
  13 #include <linux/if.h>
  14 #include <linux/module.h>
  15 #include <linux/err.h>
  16 #include <linux/list.h>
  17 #include <linux/slab.h>
  18 #include <linux/nl80211.h>
  19 #include <linux/debugfs.h>
  20 #include <linux/notifier.h>
  21 #include <linux/device.h>
  22 #include <linux/etherdevice.h>
  23 #include <linux/rtnetlink.h>
  24 #include <linux/sched.h>
  25 #include <net/genetlink.h>
  26 #include <net/cfg80211.h>
  27 #include "nl80211.h"
  28 #include "core.h"
  29 #include "sysfs.h"
  30 #include "debugfs.h"
  31 #include "wext-compat.h"
  32 #include "rdev-ops.h"
  33
  34 /* name for sysfs, %d is appended */
  35 #define PHY_NAME "phy"
  36
  37 MODULE_AUTHOR("Johannes Berg");
  38 MODULE_LICENSE("GPL");
  39 MODULE_DESCRIPTION("wireless configuration support");
  40 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
  41
  42 /* RCU-protected (and RTNL for writers) */
  43 LIST_HEAD(cfg80211_rdev_list);
  44 int cfg80211_rdev_list_generation;
  45
  46 /* for debugfs */
  47 static struct dentry *ieee80211_debugfs_dir;
  48
  49 /* for the cleanup, scan and event works */
  50 struct workqueue_struct *cfg80211_wq;
  51
  52 static bool cfg80211_disable_40mhz_24ghz;
  53 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  54 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  55                  "Disable 40MHz support in the 2.4GHz band");
  56
  57 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  58 {
  59         struct cfg80211_registered_device *result = NULL, *rdev;
  60
  61         ASSERT_RTNL();
  62
  63         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  64                 if (rdev->wiphy_idx == wiphy_idx) {
  65                         result = rdev;
  66                         break;
  67                 }
  68         }
  69
  70         return result;
  71 }
  72
  73 int get_wiphy_idx(struct wiphy *wiphy)
  74 {
  75         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
  76
  77         return rdev->wiphy_idx;
  78 }
  79
  80 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  81 {
  82         struct cfg80211_registered_device *rdev;
  83
  84         ASSERT_RTNL();
  85
  86         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  87         if (!rdev)
  88                 return NULL;
  89         return &rdev->wiphy;
  90 }
  91
  92 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
  93                                    const char *newname)
  94 {
  95         struct cfg80211_registered_device *rdev2;
  96         int wiphy_idx, taken = -1, digits;
  97
  98         ASSERT_RTNL();
  99
 100         if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
 101                 return -EINVAL;
 102
 103         /* prohibit calling the thing phy%d when %d is not its number */
 104         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 105         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 106                 /* count number of places needed to print wiphy_idx */
 107                 digits = 1;
 108                 while (wiphy_idx /= 10)
 109                         digits++;
 110                 /*
 111                  * deny the name if it is phy<idx> where <idx> is printed
 112                  * without leading zeroes. taken == strlen(newname) here
 113                  */
 114                 if (taken == strlen(PHY_NAME) + digits)
 115                         return -EINVAL;
 116         }
 117
 118         /* Ensure another device does not already have this name. */
 119         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 120                 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
 121                         return -EINVAL;
 122
 123         return 0;
 124 }
 125
 126 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 127                         char *newname)
 128 {
 129         int result;
 130
 131         ASSERT_RTNL();
 132
 133         /* Ignore nop renames */
 134         if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
 135                 return 0;
 136
 137         result = cfg80211_dev_check_name(rdev, newname);
 138         if (result < 0)
 139                 return result;
 140
 141         result = device_rename(&rdev->wiphy.dev, newname);
 142         if (result)
 143                 return result;
 144
 145         if (!IS_ERR_OR_NULL(rdev->wiphy.debugfsdir))
 146                 debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 147                                rdev->wiphy.debugfsdir,
 148                                rdev->wiphy.debugfsdir->d_parent, newname);
 149
 150         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 151
 152         return 0;
 153 }
 154
 155 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 156                           struct net *net)
 157 {
 158         struct wireless_dev *wdev;
 159         int err = 0;
 160
 161         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 162                 return -EOPNOTSUPP;
 163
 164         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 165                 if (!wdev->netdev)
 166                         continue;
 167                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 168                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 169                 if (err)
 170                         break;
 171                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 172         }
 173
 174         if (err) {
 175                 /* failed -- clean up to old netns */
 176                 net = wiphy_net(&rdev->wiphy);
 177
 178                 list_for_each_entry_continue_reverse(wdev,
 179                                                      &rdev->wiphy.wdev_list,
 180                                                      list) {
 181                         if (!wdev->netdev)
 182                                 continue;
 183                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 184                         err = dev_change_net_namespace(wdev->netdev, net,
 185                                                         "wlan%d");
 186                         WARN_ON(err);
 187                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 188                 }
 189
 190                 return err;
 191         }
 192
 193         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 194                 if (!wdev->netdev)
 195                         continue;
 196                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
 197         }
 198         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 199
 200         wiphy_net_set(&rdev->wiphy, net);
 201
 202         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 203         WARN_ON(err);
 204
 205         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 206         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 207                 if (!wdev->netdev)
 208                         continue;
 209                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
 210         }
 211
 212         return 0;
 213 }
 214
 215 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 216 {
 217         struct cfg80211_registered_device *rdev = data;
 218
 219         wiphy_lock(&rdev->wiphy);
 220         rdev_rfkill_poll(rdev);
 221         wiphy_unlock(&rdev->wiphy);
 222 }
 223
 224 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 225                               struct wireless_dev *wdev)
 226 {
 227         lockdep_assert_held(&rdev->wiphy.mtx);
 228
 229         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 230                 return;
 231
 232         if (!wdev_running(wdev))
 233                 return;
 234
 235         rdev_stop_p2p_device(rdev, wdev);
 236         wdev->is_running = false;
 237
 238         rdev->opencount--;
 239
 240         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 241                 if (WARN_ON(!rdev->scan_req->notified &&
 242                             (!rdev->int_scan_req ||
 243                              !rdev->int_scan_req->notified)))
 244                         rdev->scan_req->info.aborted = true;
 245                 ___cfg80211_scan_done(rdev, false);
 246         }
 247 }
 248
 249 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
 250                        struct wireless_dev *wdev)
 251 {
 252         lockdep_assert_held(&rdev->wiphy.mtx);
 253
 254         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
 255                 return;
 256
 257         if (!wdev_running(wdev))
 258                 return;
 259
 260         rdev_stop_nan(rdev, wdev);
 261         wdev->is_running = false;
 262
 263         rdev->opencount--;
 264 }
 265
 266 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 267 {
 268         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 269         struct wireless_dev *wdev;
 270
 271         ASSERT_RTNL();
 272
 273         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 274                 if (wdev->netdev) {
 275                         dev_close(wdev->netdev);
 276                         continue;
 277                 }
 278
 279                 /* otherwise, check iftype */
 280
 281                 wiphy_lock(wiphy);
 282
 283                 switch (wdev->iftype) {
 284                 case NL80211_IFTYPE_P2P_DEVICE:
 285                         cfg80211_stop_p2p_device(rdev, wdev);
 286                         break;
 287                 case NL80211_IFTYPE_NAN:
 288                         cfg80211_stop_nan(rdev, wdev);
 289                         break;
 290                 default:
 291                         break;
 292                 }
 293
 294                 wiphy_unlock(wiphy);
 295         }
 296 }
 297 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 298
 299 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 300 {
 301         struct cfg80211_registered_device *rdev = data;
 302
 303         if (!blocked)
 304                 return 0;
 305
 306         rtnl_lock();
 307         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 308         rtnl_unlock();
 309
 310         return 0;
 311 }
 312
 313 static void cfg80211_rfkill_block_work(struct work_struct *work)
 314 {
 315         struct cfg80211_registered_device *rdev;
 316
 317         rdev = container_of(work, struct cfg80211_registered_device,
 318                             rfkill_block);
 319         cfg80211_rfkill_set_block(rdev, true);
 320 }
 321
 322 static void cfg80211_event_work(struct work_struct *work)
 323 {
 324         struct cfg80211_registered_device *rdev;
 325
 326         rdev = container_of(work, struct cfg80211_registered_device,
 327                             event_work);
 328
 329         wiphy_lock(&rdev->wiphy);
 330         cfg80211_process_rdev_events(rdev);
 331         wiphy_unlock(&rdev->wiphy);
 332 }
 333
 334 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 335 {
 336         struct wireless_dev *wdev, *tmp;
 337
 338         ASSERT_RTNL();
 339
 340         list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
 341                 if (wdev->nl_owner_dead) {
 342                         if (wdev->netdev)
 343                                 dev_close(wdev->netdev);
 344
 345                         wiphy_lock(&rdev->wiphy);
 346                         cfg80211_leave(rdev, wdev);
 347                         cfg80211_remove_virtual_intf(rdev, wdev);
 348                         wiphy_unlock(&rdev->wiphy);
 349                 }
 350         }
 351 }
 352
 353 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 354 {
 355         struct cfg80211_registered_device *rdev;
 356
 357         rdev = container_of(work, struct cfg80211_registered_device,
 358                             destroy_work);
 359
 360         rtnl_lock();
 361         cfg80211_destroy_ifaces(rdev);
 362         rtnl_unlock();
 363 }
 364
 365 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
 366 {
 367         struct cfg80211_registered_device *rdev;
 368         struct cfg80211_sched_scan_request *req, *tmp;
 369
 370         rdev = container_of(work, struct cfg80211_registered_device,
 371                            sched_scan_stop_wk);
 372
 373         wiphy_lock(&rdev->wiphy);
 374         list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
 375                 if (req->nl_owner_dead)
 376                         cfg80211_stop_sched_scan_req(rdev, req, false);
 377         }
 378         wiphy_unlock(&rdev->wiphy);
 379 }
 380
 381 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
 382 {
 383         struct cfg80211_registered_device *rdev;
 384
 385         rdev = container_of(work, struct cfg80211_registered_device,
 386                             propagate_radar_detect_wk);
 387
 388         rtnl_lock();
 389
 390         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
 391                                        NL80211_DFS_UNAVAILABLE,
 392                                        NL80211_RADAR_DETECTED);
 393
 394         rtnl_unlock();
 395 }
 396
 397 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
 398 {
 399         struct cfg80211_registered_device *rdev;
 400
 401         rdev = container_of(work, struct cfg80211_registered_device,
 402                             propagate_cac_done_wk);
 403
 404         rtnl_lock();
 405
 406         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
 407                                        NL80211_DFS_AVAILABLE,
 408                                        NL80211_RADAR_CAC_FINISHED);
 409
 410         rtnl_unlock();
 411 }
 412
 413 static void cfg80211_wiphy_work(struct work_struct *work)
 414 {
 415         struct cfg80211_registered_device *rdev;
 416         struct wiphy_work *wk;
 417
 418         rdev = container_of(work, struct cfg80211_registered_device, wiphy_work);
 419
 420         wiphy_lock(&rdev->wiphy);
 421         if (rdev->suspended)
 422                 goto out;
 423
 424         spin_lock_irq(&rdev->wiphy_work_lock);
 425         wk = list_first_entry_or_null(&rdev->wiphy_work_list,
 426                                       struct wiphy_work, entry);
 427         if (wk) {
 428                 list_del_init(&wk->entry);
 429                 if (!list_empty(&rdev->wiphy_work_list))
 430                         schedule_work(work);
 431                 spin_unlock_irq(&rdev->wiphy_work_lock);
 432
 433                 wk->func(&rdev->wiphy, wk);
 434         } else {
 435                 spin_unlock_irq(&rdev->wiphy_work_lock);
 436         }
 437 out:
 438         wiphy_unlock(&rdev->wiphy);
 439 }
 440
 441 /* exported functions */
 442
 443 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 444                            const char *requested_name)
 445 {
 446         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 447
 448         struct cfg80211_registered_device *rdev;
 449         int alloc_size;
 450
 451         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 452         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 453         WARN_ON(ops->connect && !ops->disconnect);
 454         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 455         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 456         WARN_ON(ops->add_station && !ops->del_station);
 457         WARN_ON(ops->add_mpath && !ops->del_mpath);
 458         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 459         WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
 460         WARN_ON(ops->start_ap && !ops->stop_ap);
 461         WARN_ON(ops->join_ocb && !ops->leave_ocb);
 462         WARN_ON(ops->suspend && !ops->resume);
 463         WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
 464         WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
 465         WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
 466         WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
 467
 468         alloc_size = sizeof(*rdev) + sizeof_priv;
 469
 470         rdev = kzalloc(alloc_size, GFP_KERNEL);
 471         if (!rdev)
 472                 return NULL;
 473
 474         rdev->ops = ops;
 475
 476         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 477
 478         if (unlikely(rdev->wiphy_idx < 0)) {
 479                 /* ugh, wrapped! */
 480                 atomic_dec(&wiphy_counter);
 481                 kfree(rdev);
 482                 return NULL;
 483         }
 484
 485         /* atomic_inc_return makes it start at 1, make it start at 0 */
 486         rdev->wiphy_idx--;
 487
 488         /* give it a proper name */
 489         if (requested_name && requested_name[0]) {
 490                 int rv;
 491
 492                 rtnl_lock();
 493                 rv = cfg80211_dev_check_name(rdev, requested_name);
 494
 495                 if (rv < 0) {
 496                         rtnl_unlock();
 497                         goto use_default_name;
 498                 }
 499
 500                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 501                 rtnl_unlock();
 502                 if (rv)
 503                         goto use_default_name;
 504         } else {
 505                 int rv;
 506
 507 use_default_name:
 508                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 509                  * the restrictions on phy names.  Probably this call could
 510                  * fail if some other part of the kernel (re)named a device
 511                  * phyX.  But, might should add some locking and check return
 512                  * value, and use a different name if this one exists?
 513                  */
 514                 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 515                 if (rv < 0) {
 516                         kfree(rdev);
 517                         return NULL;
 518                 }
 519         }
 520
 521         mutex_init(&rdev->wiphy.mtx);
 522         INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
 523         INIT_LIST_HEAD(&rdev->beacon_registrations);
 524         spin_lock_init(&rdev->beacon_registrations_lock);
 525         spin_lock_init(&rdev->bss_lock);
 526         INIT_LIST_HEAD(&rdev->bss_list);
 527         INIT_LIST_HEAD(&rdev->sched_scan_req_list);
 528         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 529         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 530                           cfg80211_dfs_channels_update_work);
 531 #ifdef CONFIG_CFG80211_WEXT
 532         rdev->wiphy.wext = &cfg80211_wext_handler;
 533 #endif
 534
 535         device_initialize(&rdev->wiphy.dev);
 536         rdev->wiphy.dev.class = &ieee80211_class;
 537         rdev->wiphy.dev.platform_data = rdev;
 538         device_enable_async_suspend(&rdev->wiphy.dev);
 539
 540         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 541         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 542         INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
 543         INIT_WORK(&rdev->propagate_radar_detect_wk,
 544                   cfg80211_propagate_radar_detect_wk);
 545         INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
 546         INIT_WORK(&rdev->mgmt_registrations_update_wk,
 547                   cfg80211_mgmt_registrations_update_wk);
 548         spin_lock_init(&rdev->mgmt_registrations_lock);
 549
 550 #ifdef CONFIG_CFG80211_DEFAULT_PS
 551         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 552 #endif
 553
 554         wiphy_net_set(&rdev->wiphy, &init_net);
 555
 556         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 557         rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 558                                           &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 559                                           &rdev->rfkill_ops, rdev);
 560
 561         if (!rdev->wiphy.rfkill) {
 562                 wiphy_free(&rdev->wiphy);
 563                 return NULL;
 564         }
 565
 566         INIT_WORK(&rdev->wiphy_work, cfg80211_wiphy_work);
 567         INIT_LIST_HEAD(&rdev->wiphy_work_list);
 568         spin_lock_init(&rdev->wiphy_work_lock);
 569         INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
 570         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 571         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 572         INIT_WORK(&rdev->background_cac_abort_wk,
 573                   cfg80211_background_cac_abort_wk);
 574         INIT_DELAYED_WORK(&rdev->background_cac_done_wk,
 575                           cfg80211_background_cac_done_wk);
 576
 577         init_waitqueue_head(&rdev->dev_wait);
 578
 579         /*
 580          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 581          * Fragmentation and RTS threshold are disabled by default with the
 582          * special -1 value.
 583          */
 584         rdev->wiphy.retry_short = 7;
 585         rdev->wiphy.retry_long = 4;
 586         rdev->wiphy.frag_threshold = (u32) -1;
 587         rdev->wiphy.rts_threshold = (u32) -1;
 588         rdev->wiphy.coverage_class = 0;
 589
 590         rdev->wiphy.max_num_csa_counters = 1;
 591
 592         rdev->wiphy.max_sched_scan_plans = 1;
 593         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 594
 595         return &rdev->wiphy;
 596 }
 597 EXPORT_SYMBOL(wiphy_new_nm);
 598
 599 static int wiphy_verify_combinations(struct wiphy *wiphy)
 600 {
 601         const struct ieee80211_iface_combination *c;
 602         int i, j;
 603
 604         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 605                 u32 cnt = 0;
 606                 u16 all_iftypes = 0;
 607
 608                 c = &wiphy->iface_combinations[i];
 609
 610                 /*
 611                  * Combinations with just one interface aren't real,
 612                  * however we make an exception for DFS.
 613                  */
 614                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 615                         return -EINVAL;
 616
 617                 /* Need at least one channel */
 618                 if (WARN_ON(!c->num_different_channels))
 619                         return -EINVAL;
 620
 621                 /* DFS only works on one channel. */
 622                 if (WARN_ON(c->radar_detect_widths &&
 623                             (c->num_different_channels > 1)))
 624                         return -EINVAL;
 625
 626                 if (WARN_ON(!c->n_limits))
 627                         return -EINVAL;
 628
 629                 for (j = 0; j < c->n_limits; j++) {
 630                         u16 types = c->limits[j].types;
 631
 632                         /* interface types shouldn't overlap */
 633                         if (WARN_ON(types & all_iftypes))
 634                                 return -EINVAL;
 635                         all_iftypes |= types;
 636
 637                         if (WARN_ON(!c->limits[j].max))
 638                                 return -EINVAL;
 639
 640                         /* Shouldn't list software iftypes in combinations! */
 641                         if (WARN_ON(wiphy->software_iftypes & types))
 642                                 return -EINVAL;
 643
 644                         /* Only a single P2P_DEVICE can be allowed */
 645                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 646                                     c->limits[j].max > 1))
 647                                 return -EINVAL;
 648
 649                         /* Only a single NAN can be allowed */
 650                         if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
 651                                     c->limits[j].max > 1))
 652                                 return -EINVAL;
 653
 654                         /*
 655                          * This isn't well-defined right now. If you have an
 656                          * IBSS interface, then its beacon interval may change
 657                          * by joining other networks, and nothing prevents it
 658                          * from doing that.
 659                          * So technically we probably shouldn't even allow AP
 660                          * and IBSS in the same interface, but it seems that
 661                          * some drivers support that, possibly only with fixed
 662                          * beacon intervals for IBSS.
 663                          */
 664                         if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
 665                                     c->beacon_int_min_gcd)) {
 666                                 return -EINVAL;
 667                         }
 668
 669                         cnt += c->limits[j].max;
 670                         /*
 671                          * Don't advertise an unsupported type
 672                          * in a combination.
 673                          */
 674                         if (WARN_ON((wiphy->interface_modes & types) != types))
 675                                 return -EINVAL;
 676                 }
 677
 678                 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
 679                         return -EINVAL;
 680
 681                 /* You can't even choose that many! */
 682                 if (WARN_ON(cnt < c->max_interfaces))
 683                         return -EINVAL;
 684         }
 685
 686         return 0;
 687 }
 688
 689 int wiphy_register(struct wiphy *wiphy)
 690 {
 691         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 692         int res;
 693         enum nl80211_band band;
 694         struct ieee80211_supported_band *sband;
 695         bool have_band = false;
 696         int i;
 697         u16 ifmodes = wiphy->interface_modes;
 698
 699 #ifdef CONFIG_PM
 700         if (WARN_ON(wiphy->wowlan &&
 701                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 702                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 703                 return -EINVAL;
 704         if (WARN_ON(wiphy->wowlan &&
 705                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 706                     !wiphy->wowlan->tcp))
 707                 return -EINVAL;
 708 #endif
 709         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 710                     (!rdev->ops->tdls_channel_switch ||
 711                      !rdev->ops->tdls_cancel_channel_switch)))
 712                 return -EINVAL;
 713
 714         if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
 715                     (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
 716                      !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
 717                      !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
 718                 return -EINVAL;
 719
 720         if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
 721                 return -EINVAL;
 722
 723         if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
 724                 return -EINVAL;
 725
 726         if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
 727                 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
 728                             !wiphy->pmsr_capa->ftm.non_asap))
 729                         return -EINVAL;
 730                 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
 731                             !wiphy->pmsr_capa->ftm.bandwidths))
 732                         return -EINVAL;
 733                 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
 734                                 ~(BIT(NL80211_PREAMBLE_LEGACY) |
 735                                   BIT(NL80211_PREAMBLE_HT) |
 736                                   BIT(NL80211_PREAMBLE_VHT) |
 737                                   BIT(NL80211_PREAMBLE_HE) |
 738                                   BIT(NL80211_PREAMBLE_DMG))))
 739                         return -EINVAL;
 740                 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
 741                              wiphy->pmsr_capa->ftm.non_trigger_based) &&
 742                             !(wiphy->pmsr_capa->ftm.preambles &
 743                               BIT(NL80211_PREAMBLE_HE))))
 744                         return -EINVAL;
 745                 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
 746                                 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
 747                                   BIT(NL80211_CHAN_WIDTH_20) |
 748                                   BIT(NL80211_CHAN_WIDTH_40) |
 749                                   BIT(NL80211_CHAN_WIDTH_80) |
 750                                   BIT(NL80211_CHAN_WIDTH_80P80) |
 751                                   BIT(NL80211_CHAN_WIDTH_160) |
 752                                   BIT(NL80211_CHAN_WIDTH_5) |
 753                                   BIT(NL80211_CHAN_WIDTH_10))))
 754                         return -EINVAL;
 755         }
 756
 757         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 758                     (wiphy->regulatory_flags &
 759                                         (REGULATORY_CUSTOM_REG |
 760                                          REGULATORY_STRICT_REG |
 761                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 762                                          REGULATORY_COUNTRY_IE_IGNORE))))
 763                 return -EINVAL;
 764
 765         if (WARN_ON(wiphy->coalesce &&
 766                     (!wiphy->coalesce->n_rules ||
 767                      !wiphy->coalesce->n_patterns) &&
 768                     (!wiphy->coalesce->pattern_min_len ||
 769                      wiphy->coalesce->pattern_min_len >
 770                         wiphy->coalesce->pattern_max_len)))
 771                 return -EINVAL;
 772
 773         if (WARN_ON(wiphy->ap_sme_capa &&
 774                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 775                 return -EINVAL;
 776
 777         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 778                 return -EINVAL;
 779
 780         if (WARN_ON(wiphy->addresses &&
 781                     !is_zero_ether_addr(wiphy->perm_addr) &&
 782                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 783                            ETH_ALEN)))
 784                 return -EINVAL;
 785
 786         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 787                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 788                      !rdev->ops->set_mac_acl)))
 789                 return -EINVAL;
 790
 791         /* assure only valid behaviours are flagged by driver
 792          * hence subtract 2 as bit 0 is invalid.
 793          */
 794         if (WARN_ON(wiphy->bss_select_support &&
 795                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 796                 return -EINVAL;
 797
 798         if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
 799                                             NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
 800                     (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
 801                 return -EINVAL;
 802
 803         if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
 804                     rdev->ops->update_connect_params))
 805                 return -EINVAL;
 806
 807         if (wiphy->addresses)
 808                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 809
 810         /* sanity check ifmodes */
 811         WARN_ON(!ifmodes);
 812         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 813         if (WARN_ON(ifmodes != wiphy->interface_modes))
 814                 wiphy->interface_modes = ifmodes;
 815
 816         res = wiphy_verify_combinations(wiphy);
 817         if (res)
 818                 return res;
 819
 820         /* sanity check supported bands/channels */
 821         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 822                 u16 types = 0;
 823                 bool have_he = false;
 824
 825                 sband = wiphy->bands[band];
 826                 if (!sband)
 827                         continue;
 828
 829                 sband->band = band;
 830                 if (WARN_ON(!sband->n_channels))
 831                         return -EINVAL;
 832                 /*
 833                  * on 60GHz or sub-1Ghz band, there are no legacy rates, so
 834                  * n_bitrates is 0
 835                  */
 836                 if (WARN_ON((band != NL80211_BAND_60GHZ &&
 837                              band != NL80211_BAND_S1GHZ) &&
 838                             !sband->n_bitrates))
 839                         return -EINVAL;
 840
 841                 if (WARN_ON(band == NL80211_BAND_6GHZ &&
 842                             (sband->ht_cap.ht_supported ||
 843                              sband->vht_cap.vht_supported)))
 844                         return -EINVAL;
 845
 846                 /*
 847                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 848                  * modify the sband's ht data even if the driver uses a
 849                  * global structure for that.
 850                  */
 851                 if (cfg80211_disable_40mhz_24ghz &&
 852                     band == NL80211_BAND_2GHZ &&
 853                     sband->ht_cap.ht_supported) {
 854                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 855                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 856                 }
 857
 858                 /*
 859                  * Since we use a u32 for rate bitmaps in
 860                  * ieee80211_get_response_rate, we cannot
 861                  * have more than 32 legacy rates.
 862                  */
 863                 if (WARN_ON(sband->n_bitrates > 32))
 864                         return -EINVAL;
 865
 866                 for (i = 0; i < sband->n_channels; i++) {
 867                         sband->channels[i].orig_flags =
 868                                 sband->channels[i].flags;
 869                         sband->channels[i].orig_mag = INT_MAX;
 870                         sband->channels[i].orig_mpwr =
 871                                 sband->channels[i].max_power;
 872                         sband->channels[i].band = band;
 873
 874                         if (WARN_ON(sband->channels[i].freq_offset >= 1000))
 875                                 return -EINVAL;
 876                 }
 877
 878                 for (i = 0; i < sband->n_iftype_data; i++) {
 879                         const struct ieee80211_sband_iftype_data *iftd;
 880                         bool has_ap, has_non_ap;
 881                         u32 ap_bits = BIT(NL80211_IFTYPE_AP) |
 882                                       BIT(NL80211_IFTYPE_P2P_GO);
 883
 884                         iftd = &sband->iftype_data[i];
 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         res = device_add(&rdev->wiphy.dev);
 962         if (res) {
 963                 rtnl_unlock();
 964                 return res;
 965         }
 966
 967         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 968         cfg80211_rdev_list_generation++;
 969
 970         /* add to debugfs */
 971         rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
 972                                                     ieee80211_debugfs_dir);
 973
 974         cfg80211_debugfs_rdev_add(rdev);
 975         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 976
 977         /* set up regulatory info */
 978         wiphy_regulatory_register(wiphy);
 979
 980         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 981                 struct regulatory_request request;
 982
 983                 request.wiphy_idx = get_wiphy_idx(wiphy);
 984                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 985                 request.alpha2[0] = '9';
 986                 request.alpha2[1] = '9';
 987
 988                 nl80211_send_reg_change_event(&request);
 989         }
 990
 991         /* Check that nobody globally advertises any capabilities they do not
 992          * advertise on all possible interface types.
 993          */
 994         if (wiphy->extended_capabilities_len &&
 995             wiphy->num_iftype_ext_capab &&
 996             wiphy->iftype_ext_capab) {
 997                 u8 supported_on_all, j;
 998                 const struct wiphy_iftype_ext_capab *capab;
 999
1000                 capab = wiphy->iftype_ext_capab;
1001                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
1002                         if (capab[0].extended_capabilities_len > j)
1003                                 supported_on_all =
1004                                         capab[0].extended_capabilities[j];
1005                         else
1006                                 supported_on_all = 0x00;
1007                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
1008                                 if (j >= capab[i].extended_capabilities_len) {
1009                                         supported_on_all = 0x00;
1010                                         break;
1011                                 }
1012                                 supported_on_all &=
1013                                         capab[i].extended_capabilities[j];
1014                         }
1015                         if (WARN_ON(wiphy->extended_capabilities[j] &
1016                                     ~supported_on_all))
1017                                 break;
1018                 }
1019         }
1020
1021         rdev->wiphy.registered = true;
1022         rtnl_unlock();
1023
1024         res = rfkill_register(rdev->wiphy.rfkill);
1025         if (res) {
1026                 rfkill_destroy(rdev->wiphy.rfkill);
1027                 rdev->wiphy.rfkill = NULL;
1028                 wiphy_unregister(&rdev->wiphy);
1029                 return res;
1030         }
1031
1032         return 0;
1033 }
1034 EXPORT_SYMBOL(wiphy_register);
1035
1036 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
1037 {
1038         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1039
1040         if (!rdev->ops->rfkill_poll)
1041                 return;
1042         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
1043         rfkill_resume_polling(wiphy->rfkill);
1044 }
1045 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
1046
1047 void cfg80211_process_wiphy_works(struct cfg80211_registered_device *rdev,
1048                                   struct wiphy_work *end)
1049 {
1050         unsigned int runaway_limit = 100;
1051         unsigned long flags;
1052
1053         lockdep_assert_held(&rdev->wiphy.mtx);
1054
1055         spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1056         while (!list_empty(&rdev->wiphy_work_list)) {
1057                 struct wiphy_work *wk;
1058
1059                 wk = list_first_entry(&rdev->wiphy_work_list,
1060                                       struct wiphy_work, entry);
1061                 list_del_init(&wk->entry);
1062                 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1063
1064                 wk->func(&rdev->wiphy, wk);
1065
1066                 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1067
1068                 if (wk == end)
1069                         break;
1070
1071                 if (WARN_ON(--runaway_limit == 0))
1072                         INIT_LIST_HEAD(&rdev->wiphy_work_list);
1073         }
1074         spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1075 }
1076
1077 void wiphy_unregister(struct wiphy *wiphy)
1078 {
1079         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1080
1081         wait_event(rdev->dev_wait, ({
1082                 int __count;
1083                 wiphy_lock(&rdev->wiphy);
1084                 __count = rdev->opencount;
1085                 wiphy_unlock(&rdev->wiphy);
1086                 __count == 0; }));
1087
1088         if (rdev->wiphy.rfkill)
1089                 rfkill_unregister(rdev->wiphy.rfkill);
1090
1091         rtnl_lock();
1092         wiphy_lock(&rdev->wiphy);
1093         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1094         rdev->wiphy.registered = false;
1095
1096         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1097
1098         /*
1099          * First remove the hardware from everywhere, this makes
1100          * it impossible to find from userspace.
1101          */
1102         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1103         list_del_rcu(&rdev->list);
1104         synchronize_rcu();
1105
1106         /*
1107          * If this device got a regulatory hint tell core its
1108          * free to listen now to a new shiny device regulatory hint
1109          */
1110         wiphy_regulatory_deregister(wiphy);
1111
1112         cfg80211_rdev_list_generation++;
1113         device_del(&rdev->wiphy.dev);
1114
1115 #ifdef CONFIG_PM
1116         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1117                 rdev_set_wakeup(rdev, false);
1118 #endif
1119
1120         /* surely nothing is reachable now, clean up work */
1121         cfg80211_process_wiphy_works(rdev, NULL);
1122         wiphy_unlock(&rdev->wiphy);
1123         rtnl_unlock();
1124
1125         /* this has nothing to do now but make sure it's gone */
1126         cancel_work_sync(&rdev->wiphy_work);
1127
1128         flush_work(&rdev->scan_done_wk);
1129         cancel_work_sync(&rdev->conn_work);
1130         flush_work(&rdev->event_work);
1131         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1132         cancel_delayed_work_sync(&rdev->background_cac_done_wk);
1133         flush_work(&rdev->destroy_work);
1134         flush_work(&rdev->sched_scan_stop_wk);
1135         flush_work(&rdev->propagate_radar_detect_wk);
1136         flush_work(&rdev->propagate_cac_done_wk);
1137         flush_work(&rdev->mgmt_registrations_update_wk);
1138         flush_work(&rdev->background_cac_abort_wk);
1139
1140         cfg80211_rdev_free_wowlan(rdev);
1141         cfg80211_rdev_free_coalesce(rdev);
1142 }
1143 EXPORT_SYMBOL(wiphy_unregister);
1144
1145 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1146 {
1147         struct cfg80211_internal_bss *scan, *tmp;
1148         struct cfg80211_beacon_registration *reg, *treg;
1149         rfkill_destroy(rdev->wiphy.rfkill);
1150         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1151                 list_del(&reg->list);
1152                 kfree(reg);
1153         }
1154         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1155                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1156         mutex_destroy(&rdev->wiphy.mtx);
1157
1158         /*
1159          * The 'regd' can only be non-NULL if we never finished
1160          * initializing the wiphy and thus never went through the
1161          * unregister path - e.g. in failure scenarios. Thus, it
1162          * cannot have been visible to anyone if non-NULL, so we
1163          * can just free it here.
1164          */
1165         kfree(rcu_dereference_raw(rdev->wiphy.regd));
1166
1167         kfree(rdev);
1168 }
1169
1170 void wiphy_free(struct wiphy *wiphy)
1171 {
1172         put_device(&wiphy->dev);
1173 }
1174 EXPORT_SYMBOL(wiphy_free);
1175
1176 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
1177                                       enum rfkill_hard_block_reasons reason)
1178 {
1179         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1180
1181         if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason))
1182                 schedule_work(&rdev->rfkill_block);
1183 }
1184 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);
1185
1186 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
1187                                       bool unregister_netdev)
1188 {
1189         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1190         struct cfg80211_cqm_config *cqm_config;
1191         unsigned int link_id;
1192
1193         ASSERT_RTNL();
1194         lockdep_assert_held(&rdev->wiphy.mtx);
1195
1196         flush_work(&wdev->pmsr_free_wk);
1197
1198         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1199
1200         wdev->registered = false;
1201
1202         if (wdev->netdev) {
1203                 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
1204                 if (unregister_netdev)
1205                         unregister_netdevice(wdev->netdev);
1206         }
1207
1208         list_del_rcu(&wdev->list);
1209         synchronize_net();
1210         rdev->devlist_generation++;
1211
1212         cfg80211_mlme_purge_registrations(wdev);
1213
1214         switch (wdev->iftype) {
1215         case NL80211_IFTYPE_P2P_DEVICE:
1216                 cfg80211_stop_p2p_device(rdev, wdev);
1217                 break;
1218         case NL80211_IFTYPE_NAN:
1219                 cfg80211_stop_nan(rdev, wdev);
1220                 break;
1221         default:
1222                 break;
1223         }
1224
1225 #ifdef CONFIG_CFG80211_WEXT
1226         kfree_sensitive(wdev->wext.keys);
1227         wdev->wext.keys = NULL;
1228 #endif
1229         wiphy_work_cancel(wdev->wiphy, &wdev->cqm_rssi_work);
1230         /* deleted from the list, so can't be found from nl80211 any more */
1231         cqm_config = rcu_access_pointer(wdev->cqm_config);
1232         kfree_rcu(cqm_config, rcu_head);
1233
1234         /*
1235          * Ensure that all events have been processed and
1236          * freed.
1237          */
1238         cfg80211_process_wdev_events(wdev);
1239
1240         if (wdev->iftype == NL80211_IFTYPE_STATION ||
1241             wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) {
1242                 for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) {
1243                         struct cfg80211_internal_bss *curbss;
1244
1245                         curbss = wdev->links[link_id].client.current_bss;
1246
1247                         if (WARN_ON(curbss)) {
1248                                 cfg80211_unhold_bss(curbss);
1249                                 cfg80211_put_bss(wdev->wiphy, &curbss->pub);
1250                                 wdev->links[link_id].client.current_bss = NULL;
1251                         }
1252                 }
1253         }
1254
1255         wdev->connected = false;
1256 }
1257
1258 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1259 {
1260         _cfg80211_unregister_wdev(wdev, true);
1261 }
1262 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1263
1264 static const struct device_type wiphy_type = {
1265         .name   = "wlan",
1266 };
1267
1268 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1269                                enum nl80211_iftype iftype, int num)
1270 {
1271         lockdep_assert_held(&rdev->wiphy.mtx);
1272
1273         rdev->num_running_ifaces += num;
1274         if (iftype == NL80211_IFTYPE_MONITOR)
1275                 rdev->num_running_monitor_ifaces += num;
1276 }
1277
1278 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1279                       struct wireless_dev *wdev)
1280 {
1281         struct net_device *dev = wdev->netdev;
1282         struct cfg80211_sched_scan_request *pos, *tmp;
1283
1284         lockdep_assert_held(&rdev->wiphy.mtx);
1285         ASSERT_WDEV_LOCK(wdev);
1286
1287         cfg80211_pmsr_wdev_down(wdev);
1288
1289         cfg80211_stop_background_radar_detection(wdev);
1290
1291         switch (wdev->iftype) {
1292         case NL80211_IFTYPE_ADHOC:
1293                 __cfg80211_leave_ibss(rdev, dev, true);
1294                 break;
1295         case NL80211_IFTYPE_P2P_CLIENT:
1296         case NL80211_IFTYPE_STATION:
1297                 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1298                                          list) {
1299                         if (dev == pos->dev)
1300                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1301                 }
1302
1303 #ifdef CONFIG_CFG80211_WEXT
1304                 kfree(wdev->wext.ie);
1305                 wdev->wext.ie = NULL;
1306                 wdev->wext.ie_len = 0;
1307                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1308 #endif
1309                 cfg80211_disconnect(rdev, dev,
1310                                     WLAN_REASON_DEAUTH_LEAVING, true);
1311                 break;
1312         case NL80211_IFTYPE_MESH_POINT:
1313                 __cfg80211_leave_mesh(rdev, dev);
1314                 break;
1315         case NL80211_IFTYPE_AP:
1316         case NL80211_IFTYPE_P2P_GO:
1317                 __cfg80211_stop_ap(rdev, dev, -1, true);
1318                 break;
1319         case NL80211_IFTYPE_OCB:
1320                 __cfg80211_leave_ocb(rdev, dev);
1321                 break;
1322         case NL80211_IFTYPE_P2P_DEVICE:
1323         case NL80211_IFTYPE_NAN:
1324                 /* cannot happen, has no netdev */
1325                 break;
1326         case NL80211_IFTYPE_AP_VLAN:
1327         case NL80211_IFTYPE_MONITOR:
1328                 /* nothing to do */
1329                 break;
1330         case NL80211_IFTYPE_UNSPECIFIED:
1331         case NL80211_IFTYPE_WDS:
1332         case NUM_NL80211_IFTYPES:
1333                 /* invalid */
1334                 break;
1335         }
1336 }
1337
1338 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1339                     struct wireless_dev *wdev)
1340 {
1341         wdev_lock(wdev);
1342         __cfg80211_leave(rdev, wdev);
1343         wdev_unlock(wdev);
1344 }
1345
1346 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1347                          gfp_t gfp)
1348 {
1349         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1350         struct cfg80211_event *ev;
1351         unsigned long flags;
1352
1353         trace_cfg80211_stop_iface(wiphy, wdev);
1354
1355         ev = kzalloc(sizeof(*ev), gfp);
1356         if (!ev)
1357                 return;
1358
1359         ev->type = EVENT_STOPPED;
1360
1361         spin_lock_irqsave(&wdev->event_lock, flags);
1362         list_add_tail(&ev->list, &wdev->event_list);
1363         spin_unlock_irqrestore(&wdev->event_lock, flags);
1364         queue_work(cfg80211_wq, &rdev->event_work);
1365 }
1366 EXPORT_SYMBOL(cfg80211_stop_iface);
1367
1368 void cfg80211_init_wdev(struct wireless_dev *wdev)
1369 {
1370         mutex_init(&wdev->mtx);
1371         INIT_LIST_HEAD(&wdev->event_list);
1372         spin_lock_init(&wdev->event_lock);
1373         INIT_LIST_HEAD(&wdev->mgmt_registrations);
1374         INIT_LIST_HEAD(&wdev->pmsr_list);
1375         spin_lock_init(&wdev->pmsr_lock);
1376         INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1377
1378 #ifdef CONFIG_CFG80211_WEXT
1379         wdev->wext.default_key = -1;
1380         wdev->wext.default_mgmt_key = -1;
1381         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1382 #endif
1383
1384         wiphy_work_init(&wdev->cqm_rssi_work, cfg80211_cqm_rssi_notify_work);
1385
1386         if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1387                 wdev->ps = true;
1388         else
1389                 wdev->ps = false;
1390         /* allow mac80211 to determine the timeout */
1391         wdev->ps_timeout = -1;
1392
1393         if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1394              wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1395              wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1396                 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1397
1398         INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1399 }
1400
1401 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1402                             struct wireless_dev *wdev)
1403 {
1404         ASSERT_RTNL();
1405         lockdep_assert_held(&rdev->wiphy.mtx);
1406
1407         /*
1408          * We get here also when the interface changes network namespaces,
1409          * as it's registered into the new one, but we don't want it to
1410          * change ID in that case. Checking if the ID is already assigned
1411          * works, because 0 isn't considered a valid ID and the memory is
1412          * 0-initialized.
1413          */
1414         if (!wdev->identifier)
1415                 wdev->identifier = ++rdev->wdev_id;
1416         list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1417         rdev->devlist_generation++;
1418         wdev->registered = true;
1419
1420         if (wdev->netdev &&
1421             sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj,
1422                               "phy80211"))
1423                 pr_err("failed to add phy80211 symlink to netdev!\n");
1424
1425         nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1426 }
1427
1428 int cfg80211_register_netdevice(struct net_device *dev)
1429 {
1430         struct wireless_dev *wdev = dev->ieee80211_ptr;
1431         struct cfg80211_registered_device *rdev;
1432         int ret;
1433
1434         ASSERT_RTNL();
1435
1436         if (WARN_ON(!wdev))
1437                 return -EINVAL;
1438
1439         rdev = wiphy_to_rdev(wdev->wiphy);
1440
1441         lockdep_assert_held(&rdev->wiphy.mtx);
1442
1443         /* we'll take care of this */
1444         wdev->registered = true;
1445         wdev->registering = true;
1446         ret = register_netdevice(dev);
1447         if (ret)
1448                 goto out;
1449
1450         cfg80211_register_wdev(rdev, wdev);
1451         ret = 0;
1452 out:
1453         wdev->registering = false;
1454         if (ret)
1455                 wdev->registered = false;
1456         return ret;
1457 }
1458 EXPORT_SYMBOL(cfg80211_register_netdevice);
1459
1460 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1461                                          unsigned long state, void *ptr)
1462 {
1463         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1464         struct wireless_dev *wdev = dev->ieee80211_ptr;
1465         struct cfg80211_registered_device *rdev;
1466         struct cfg80211_sched_scan_request *pos, *tmp;
1467
1468         if (!wdev)
1469                 return NOTIFY_DONE;
1470
1471         rdev = wiphy_to_rdev(wdev->wiphy);
1472
1473         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1474
1475         switch (state) {
1476         case NETDEV_POST_INIT:
1477                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1478                 wdev->netdev = dev;
1479                 /* can only change netns with wiphy */
1480                 dev->features |= NETIF_F_NETNS_LOCAL;
1481
1482                 cfg80211_init_wdev(wdev);
1483                 break;
1484         case NETDEV_REGISTER:
1485                 if (!wdev->registered) {
1486                         wiphy_lock(&rdev->wiphy);
1487                         cfg80211_register_wdev(rdev, wdev);
1488                         wiphy_unlock(&rdev->wiphy);
1489                 }
1490                 break;
1491         case NETDEV_UNREGISTER:
1492                 /*
1493                  * It is possible to get NETDEV_UNREGISTER multiple times,
1494                  * so check wdev->registered.
1495                  */
1496                 if (wdev->registered && !wdev->registering) {
1497                         wiphy_lock(&rdev->wiphy);
1498                         _cfg80211_unregister_wdev(wdev, false);
1499                         wiphy_unlock(&rdev->wiphy);
1500                 }
1501                 break;
1502         case NETDEV_GOING_DOWN:
1503                 wiphy_lock(&rdev->wiphy);
1504                 cfg80211_leave(rdev, wdev);
1505                 cfg80211_remove_links(wdev);
1506                 wiphy_unlock(&rdev->wiphy);
1507                 /* since we just did cfg80211_leave() nothing to do there */
1508                 cancel_work_sync(&wdev->disconnect_wk);
1509                 break;
1510         case NETDEV_DOWN:
1511                 wiphy_lock(&rdev->wiphy);
1512                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1513                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1514                         if (WARN_ON(!rdev->scan_req->notified &&
1515                                     (!rdev->int_scan_req ||
1516                                      !rdev->int_scan_req->notified)))
1517                                 rdev->scan_req->info.aborted = true;
1518                         ___cfg80211_scan_done(rdev, false);
1519                 }
1520
1521                 list_for_each_entry_safe(pos, tmp,
1522                                          &rdev->sched_scan_req_list, list) {
1523                         if (WARN_ON(pos->dev == wdev->netdev))
1524                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1525                 }
1526
1527                 rdev->opencount--;
1528                 wiphy_unlock(&rdev->wiphy);
1529                 wake_up(&rdev->dev_wait);
1530                 break;
1531         case NETDEV_UP:
1532                 wiphy_lock(&rdev->wiphy);
1533                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1534                 wdev_lock(wdev);
1535                 switch (wdev->iftype) {
1536 #ifdef CONFIG_CFG80211_WEXT
1537                 case NL80211_IFTYPE_ADHOC:
1538                         cfg80211_ibss_wext_join(rdev, wdev);
1539                         break;
1540                 case NL80211_IFTYPE_STATION:
1541                         cfg80211_mgd_wext_connect(rdev, wdev);
1542                         break;
1543 #endif
1544 #ifdef CONFIG_MAC80211_MESH
1545                 case NL80211_IFTYPE_MESH_POINT:
1546                         {
1547                                 /* backward compat code... */
1548                                 struct mesh_setup setup;
1549                                 memcpy(&setup, &default_mesh_setup,
1550                                                 sizeof(setup));
1551                                  /* back compat only needed for mesh_id */
1552                                 setup.mesh_id = wdev->u.mesh.id;
1553                                 setup.mesh_id_len = wdev->u.mesh.id_up_len;
1554                                 if (wdev->u.mesh.id_up_len)
1555                                         __cfg80211_join_mesh(rdev, dev,
1556                                                         &setup,
1557                                                         &default_mesh_config);
1558                                 break;
1559                         }
1560 #endif
1561                 default:
1562                         break;
1563                 }
1564                 wdev_unlock(wdev);
1565                 rdev->opencount++;
1566
1567                 /*
1568                  * Configure power management to the driver here so that its
1569                  * correctly set also after interface type changes etc.
1570                  */
1571                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1572                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1573                     rdev->ops->set_power_mgmt &&
1574                     rdev_set_power_mgmt(rdev, dev, wdev->ps,
1575                                         wdev->ps_timeout)) {
1576                         /* assume this means it's off */
1577                         wdev->ps = false;
1578                 }
1579                 wiphy_unlock(&rdev->wiphy);
1580                 break;
1581         case NETDEV_PRE_UP:
1582                 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1583                                              wdev->use_4addr, 0))
1584                         return notifier_from_errno(-EOPNOTSUPP);
1585
1586                 if (rfkill_blocked(rdev->wiphy.rfkill))
1587                         return notifier_from_errno(-ERFKILL);
1588                 break;
1589         default:
1590                 return NOTIFY_DONE;
1591         }
1592
1593         wireless_nlevent_flush();
1594
1595         return NOTIFY_OK;
1596 }
1597
1598 static struct notifier_block cfg80211_netdev_notifier = {
1599         .notifier_call = cfg80211_netdev_notifier_call,
1600 };
1601
1602 static void __net_exit cfg80211_pernet_exit(struct net *net)
1603 {
1604         struct cfg80211_registered_device *rdev;
1605
1606         rtnl_lock();
1607         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1608                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1609                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1610         }
1611         rtnl_unlock();
1612 }
1613
1614 static struct pernet_operations cfg80211_pernet_ops = {
1615         .exit = cfg80211_pernet_exit,
1616 };
1617
1618 void wiphy_work_queue(struct wiphy *wiphy, struct wiphy_work *work)
1619 {
1620         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1621         unsigned long flags;
1622
1623         spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1624         if (list_empty(&work->entry))
1625                 list_add_tail(&work->entry, &rdev->wiphy_work_list);
1626         spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1627
1628         queue_work(system_unbound_wq, &rdev->wiphy_work);
1629 }
1630 EXPORT_SYMBOL_GPL(wiphy_work_queue);
1631
1632 void wiphy_work_cancel(struct wiphy *wiphy, struct wiphy_work *work)
1633 {
1634         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1635         unsigned long flags;
1636
1637         lockdep_assert_held(&wiphy->mtx);
1638
1639         spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1640         if (!list_empty(&work->entry))
1641                 list_del_init(&work->entry);
1642         spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1643 }
1644 EXPORT_SYMBOL_GPL(wiphy_work_cancel);
1645
1646 void wiphy_work_flush(struct wiphy *wiphy, struct wiphy_work *work)
1647 {
1648         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1649         unsigned long flags;
1650         bool run;
1651
1652         spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1653         run = !work || !list_empty(&work->entry);
1654         spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1655
1656         if (run)
1657                 cfg80211_process_wiphy_works(rdev, work);
1658 }
1659 EXPORT_SYMBOL_GPL(wiphy_work_flush);
1660
1661 void wiphy_delayed_work_timer(struct timer_list *t)
1662 {
1663         struct wiphy_delayed_work *dwork = from_timer(dwork, t, timer);
1664
1665         wiphy_work_queue(dwork->wiphy, &dwork->work);
1666 }
1667 EXPORT_SYMBOL(wiphy_delayed_work_timer);
1668
1669 void wiphy_delayed_work_queue(struct wiphy *wiphy,
1670                               struct wiphy_delayed_work *dwork,
1671                               unsigned long delay)
1672 {
1673         if (!delay) {
1674                 del_timer(&dwork->timer);
1675                 wiphy_work_queue(wiphy, &dwork->work);
1676                 return;
1677         }
1678
1679         dwork->wiphy = wiphy;
1680         mod_timer(&dwork->timer, jiffies + delay);
1681 }
1682 EXPORT_SYMBOL_GPL(wiphy_delayed_work_queue);
1683
1684 void wiphy_delayed_work_cancel(struct wiphy *wiphy,
1685                                struct wiphy_delayed_work *dwork)
1686 {
1687         lockdep_assert_held(&wiphy->mtx);
1688
1689         del_timer_sync(&dwork->timer);
1690         wiphy_work_cancel(wiphy, &dwork->work);
1691 }
1692 EXPORT_SYMBOL_GPL(wiphy_delayed_work_cancel);
1693
1694 void wiphy_delayed_work_flush(struct wiphy *wiphy,
1695                               struct wiphy_delayed_work *dwork)
1696 {
1697         lockdep_assert_held(&wiphy->mtx);
1698
1699         del_timer_sync(&dwork->timer);
1700         wiphy_work_flush(wiphy, &dwork->work);
1701 }
1702 EXPORT_SYMBOL_GPL(wiphy_delayed_work_flush);
1703
1704 static int __init cfg80211_init(void)
1705 {
1706         int err;
1707
1708         err = register_pernet_device(&cfg80211_pernet_ops);
1709         if (err)
1710                 goto out_fail_pernet;
1711
1712         err = wiphy_sysfs_init();
1713         if (err)
1714                 goto out_fail_sysfs;
1715
1716         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1717         if (err)
1718                 goto out_fail_notifier;
1719
1720         err = nl80211_init();
1721         if (err)
1722                 goto out_fail_nl80211;
1723
1724         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1725
1726         err = regulatory_init();
1727         if (err)
1728                 goto out_fail_reg;
1729
1730         cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1731         if (!cfg80211_wq) {
1732                 err = -ENOMEM;
1733                 goto out_fail_wq;
1734         }
1735
1736         return 0;
1737
1738 out_fail_wq:
1739         regulatory_exit();
1740 out_fail_reg:
1741         debugfs_remove(ieee80211_debugfs_dir);
1742         nl80211_exit();
1743 out_fail_nl80211:
1744         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1745 out_fail_notifier:
1746         wiphy_sysfs_exit();
1747 out_fail_sysfs:
1748         unregister_pernet_device(&cfg80211_pernet_ops);
1749 out_fail_pernet:
1750         return err;
1751 }
1752 fs_initcall(cfg80211_init);
1753
1754 static void __exit cfg80211_exit(void)
1755 {
1756         debugfs_remove(ieee80211_debugfs_dir);
1757         nl80211_exit();
1758         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1759         wiphy_sysfs_exit();
1760         regulatory_exit();
1761         unregister_pernet_device(&cfg80211_pernet_ops);
1762         destroy_workqueue(cfg80211_wq);
1763 }
1764 module_exit(cfg80211_exit);