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) 2018-2024 Intel Corporation
   9  */
  10
  11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  12
  13 #include <linux/if.h>
  14 #include <linux/module.h>
  15 #include <linux/err.h>
  16 #include <linux/list.h>
  17 #include <linux/slab.h>
  18 #include <linux/nl80211.h>
  19 #include <linux/debugfs.h>
  20 #include <linux/notifier.h>
  21 #include <linux/device.h>
  22 #include <linux/etherdevice.h>
  23 #include <linux/rtnetlink.h>
  24 #include <linux/sched.h>
  25 #include <net/genetlink.h>
  26 #include <net/cfg80211.h>
  27 #include "nl80211.h"
  28 #include "core.h"
  29 #include "sysfs.h"
  30 #include "debugfs.h"
  31 #include "wext-compat.h"
  32 #include "rdev-ops.h"
  33
  34 /* name for sysfs, %d is appended */
  35 #define PHY_NAME "phy"
  36
  37 MODULE_AUTHOR("Johannes Berg");
  38 MODULE_LICENSE("GPL");
  39 MODULE_DESCRIPTION("wireless configuration support");
  40 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
  41
  42 /* RCU-protected (and RTNL for writers) */
  43 LIST_HEAD(cfg80211_rdev_list);
  44 int cfg80211_rdev_list_generation;
  45
  46 /* for debugfs */
  47 static struct dentry *ieee80211_debugfs_dir;
  48
  49 /* for the cleanup, scan and event works */
  50 struct workqueue_struct *cfg80211_wq;
  51
  52 static bool cfg80211_disable_40mhz_24ghz;
  53 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  54 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  55                  "Disable 40MHz support in the 2.4GHz band");
  56
  57 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  58 {
  59         struct cfg80211_registered_device *result = NULL, *rdev;
  60
  61         ASSERT_RTNL();
  62
  63         for_each_rdev(rdev) {
  64                 if (rdev->wiphy_idx == wiphy_idx) {
  65                         result = rdev;
  66                         break;
  67                 }
  68         }
  69
  70         return result;
  71 }
  72
  73 int get_wiphy_idx(struct wiphy *wiphy)
  74 {
  75         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
  76
  77         return rdev->wiphy_idx;
  78 }
  79
  80 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  81 {
  82         struct cfg80211_registered_device *rdev;
  83
  84         ASSERT_RTNL();
  85
  86         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  87         if (!rdev)
  88                 return NULL;
  89         return &rdev->wiphy;
  90 }
  91
  92 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
  93                                    const char *newname)
  94 {
  95         struct cfg80211_registered_device *rdev2;
  96         int wiphy_idx, taken = -1, digits;
  97
  98         ASSERT_RTNL();
  99
 100         if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
 101                 return -EINVAL;
 102
 103         /* prohibit calling the thing phy%d when %d is not its number */
 104         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 105         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 106                 /* count number of places needed to print wiphy_idx */
 107                 digits = 1;
 108                 while (wiphy_idx /= 10)
 109                         digits++;
 110                 /*
 111                  * deny the name if it is phy<idx> where <idx> is printed
 112                  * without leading zeroes. taken == strlen(newname) here
 113                  */
 114                 if (taken == strlen(PHY_NAME) + digits)
 115                         return -EINVAL;
 116         }
 117
 118         /* Ensure another device does not already have this name. */
 119         for_each_rdev(rdev2)
 120                 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
 121                         return -EINVAL;
 122
 123         return 0;
 124 }
 125
 126 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 127                         char *newname)
 128 {
 129         int result;
 130
 131         ASSERT_RTNL();
 132         lockdep_assert_wiphy(&rdev->wiphy);
 133
 134         /* Ignore nop renames */
 135         if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
 136                 return 0;
 137
 138         result = cfg80211_dev_check_name(rdev, newname);
 139         if (result < 0)
 140                 return result;
 141
 142         result = device_rename(&rdev->wiphy.dev, newname);
 143         if (result)
 144                 return result;
 145
 146         if (!IS_ERR_OR_NULL(rdev->wiphy.debugfsdir))
 147                 debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 148                                rdev->wiphy.debugfsdir,
 149                                rdev->wiphy.debugfsdir->d_parent, newname);
 150
 151         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 152
 153         return 0;
 154 }
 155
 156 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 157                           struct net *net)
 158 {
 159         struct wireless_dev *wdev;
 160         int err = 0;
 161
 162         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 163                 return -EOPNOTSUPP;
 164
 165         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 166                 if (!wdev->netdev)
 167                         continue;
 168                 wdev->netdev->netns_local = false;
 169                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 170                 if (err)
 171                         break;
 172                 wdev->netdev->netns_local = true;
 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->netns_local = false;
 185                         err = dev_change_net_namespace(wdev->netdev, net,
 186                                                         "wlan%d");
 187                         WARN_ON(err);
 188                         wdev->netdev->netns_local = true;
 189                 }
 190
 191                 return err;
 192         }
 193
 194         wiphy_lock(&rdev->wiphy);
 195         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 196                 if (!wdev->netdev)
 197                         continue;
 198                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
 199         }
 200
 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
 210         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 211                 if (!wdev->netdev)
 212                         continue;
 213                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
 214         }
 215         wiphy_unlock(&rdev->wiphy);
 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         wiphy_lock(&rdev->wiphy);
 225         rdev_rfkill_poll(rdev);
 226         wiphy_unlock(&rdev->wiphy);
 227 }
 228
 229 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 230                               struct wireless_dev *wdev)
 231 {
 232         lockdep_assert_held(&rdev->wiphy.mtx);
 233
 234         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 235                 return;
 236
 237         if (!wdev_running(wdev))
 238                 return;
 239
 240         rdev_stop_p2p_device(rdev, wdev);
 241         wdev->is_running = false;
 242
 243         rdev->opencount--;
 244
 245         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 246                 if (WARN_ON(!rdev->scan_req->notified &&
 247                             (!rdev->int_scan_req ||
 248                              !rdev->int_scan_req->notified)))
 249                         rdev->scan_req->info.aborted = true;
 250                 ___cfg80211_scan_done(rdev, false);
 251         }
 252 }
 253
 254 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
 255                        struct wireless_dev *wdev)
 256 {
 257         lockdep_assert_held(&rdev->wiphy.mtx);
 258
 259         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
 260                 return;
 261
 262         if (!wdev_running(wdev))
 263                 return;
 264
 265         rdev_stop_nan(rdev, wdev);
 266         wdev->is_running = false;
 267
 268         rdev->opencount--;
 269 }
 270
 271 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 272 {
 273         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 274         struct wireless_dev *wdev;
 275
 276         ASSERT_RTNL();
 277
 278         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 279                 if (wdev->netdev) {
 280                         dev_close(wdev->netdev);
 281                         continue;
 282                 }
 283
 284                 /* otherwise, check iftype */
 285
 286                 wiphy_lock(wiphy);
 287
 288                 switch (wdev->iftype) {
 289                 case NL80211_IFTYPE_P2P_DEVICE:
 290                         cfg80211_stop_p2p_device(rdev, wdev);
 291                         break;
 292                 case NL80211_IFTYPE_NAN:
 293                         cfg80211_stop_nan(rdev, wdev);
 294                         break;
 295                 default:
 296                         break;
 297                 }
 298
 299                 wiphy_unlock(wiphy);
 300         }
 301 }
 302 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 303
 304 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 305 {
 306         struct cfg80211_registered_device *rdev = data;
 307
 308         if (!blocked)
 309                 return 0;
 310
 311         rtnl_lock();
 312         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 313         rtnl_unlock();
 314
 315         return 0;
 316 }
 317
 318 static void cfg80211_rfkill_block_work(struct work_struct *work)
 319 {
 320         struct cfg80211_registered_device *rdev;
 321
 322         rdev = container_of(work, struct cfg80211_registered_device,
 323                             rfkill_block);
 324         cfg80211_rfkill_set_block(rdev, true);
 325 }
 326
 327 static void cfg80211_event_work(struct work_struct *work)
 328 {
 329         struct cfg80211_registered_device *rdev;
 330
 331         rdev = container_of(work, struct cfg80211_registered_device,
 332                             event_work);
 333
 334         wiphy_lock(&rdev->wiphy);
 335         cfg80211_process_rdev_events(rdev);
 336         wiphy_unlock(&rdev->wiphy);
 337 }
 338
 339 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 340 {
 341         struct wireless_dev *wdev, *tmp;
 342
 343         ASSERT_RTNL();
 344
 345         list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
 346                 if (wdev->nl_owner_dead) {
 347                         if (wdev->netdev)
 348                                 dev_close(wdev->netdev);
 349
 350                         wiphy_lock(&rdev->wiphy);
 351                         cfg80211_leave(rdev, wdev);
 352                         cfg80211_remove_virtual_intf(rdev, wdev);
 353                         wiphy_unlock(&rdev->wiphy);
 354                 }
 355         }
 356 }
 357
 358 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 359 {
 360         struct cfg80211_registered_device *rdev;
 361
 362         rdev = container_of(work, struct cfg80211_registered_device,
 363                             destroy_work);
 364
 365         rtnl_lock();
 366         cfg80211_destroy_ifaces(rdev);
 367         rtnl_unlock();
 368 }
 369
 370 static void cfg80211_sched_scan_stop_wk(struct wiphy *wiphy,
 371                                         struct wiphy_work *work)
 372 {
 373         struct cfg80211_registered_device *rdev;
 374         struct cfg80211_sched_scan_request *req, *tmp;
 375
 376         rdev = container_of(work, struct cfg80211_registered_device,
 377                            sched_scan_stop_wk);
 378
 379         list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
 380                 if (req->nl_owner_dead)
 381                         cfg80211_stop_sched_scan_req(rdev, req, false);
 382         }
 383 }
 384
 385 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
 386 {
 387         struct cfg80211_registered_device *rdev;
 388
 389         rdev = container_of(work, struct cfg80211_registered_device,
 390                             propagate_radar_detect_wk);
 391
 392         rtnl_lock();
 393
 394         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
 395                                        NL80211_DFS_UNAVAILABLE,
 396                                        NL80211_RADAR_DETECTED);
 397
 398         rtnl_unlock();
 399 }
 400
 401 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
 402 {
 403         struct cfg80211_registered_device *rdev;
 404
 405         rdev = container_of(work, struct cfg80211_registered_device,
 406                             propagate_cac_done_wk);
 407
 408         rtnl_lock();
 409
 410         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
 411                                        NL80211_DFS_AVAILABLE,
 412                                        NL80211_RADAR_CAC_FINISHED);
 413
 414         rtnl_unlock();
 415 }
 416
 417 static void cfg80211_wiphy_work(struct work_struct *work)
 418 {
 419         struct cfg80211_registered_device *rdev;
 420         struct wiphy_work *wk;
 421
 422         rdev = container_of(work, struct cfg80211_registered_device, wiphy_work);
 423
 424         trace_wiphy_work_worker_start(&rdev->wiphy);
 425
 426         wiphy_lock(&rdev->wiphy);
 427         if (rdev->suspended)
 428                 goto out;
 429
 430         spin_lock_irq(&rdev->wiphy_work_lock);
 431         wk = list_first_entry_or_null(&rdev->wiphy_work_list,
 432                                       struct wiphy_work, entry);
 433         if (wk) {
 434                 list_del_init(&wk->entry);
 435                 if (!list_empty(&rdev->wiphy_work_list))
 436                         queue_work(system_unbound_wq, work);
 437                 spin_unlock_irq(&rdev->wiphy_work_lock);
 438
 439                 trace_wiphy_work_run(&rdev->wiphy, wk);
 440                 wk->func(&rdev->wiphy, wk);
 441         } else {
 442                 spin_unlock_irq(&rdev->wiphy_work_lock);
 443         }
 444 out:
 445         wiphy_unlock(&rdev->wiphy);
 446 }
 447
 448 /* exported functions */
 449
 450 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 451                            const char *requested_name)
 452 {
 453         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 454
 455         struct cfg80211_registered_device *rdev;
 456         int alloc_size;
 457
 458         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 459         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 460         WARN_ON(ops->connect && !ops->disconnect);
 461         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 462         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 463         WARN_ON(ops->add_station && !ops->del_station);
 464         WARN_ON(ops->add_mpath && !ops->del_mpath);
 465         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 466         WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
 467         WARN_ON(ops->start_ap && !ops->stop_ap);
 468         WARN_ON(ops->join_ocb && !ops->leave_ocb);
 469         WARN_ON(ops->suspend && !ops->resume);
 470         WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
 471         WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
 472         WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
 473         WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
 474
 475         alloc_size = sizeof(*rdev) + sizeof_priv;
 476
 477         rdev = kzalloc(alloc_size, GFP_KERNEL);
 478         if (!rdev)
 479                 return NULL;
 480
 481         rdev->ops = ops;
 482
 483         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 484
 485         if (unlikely(rdev->wiphy_idx < 0)) {
 486                 /* ugh, wrapped! */
 487                 atomic_dec(&wiphy_counter);
 488                 kfree(rdev);
 489                 return NULL;
 490         }
 491
 492         /* atomic_inc_return makes it start at 1, make it start at 0 */
 493         rdev->wiphy_idx--;
 494
 495         /* give it a proper name */
 496         if (requested_name && requested_name[0]) {
 497                 int rv;
 498
 499                 rtnl_lock();
 500                 rv = cfg80211_dev_check_name(rdev, requested_name);
 501
 502                 if (rv < 0) {
 503                         rtnl_unlock();
 504                         goto use_default_name;
 505                 }
 506
 507                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 508                 rtnl_unlock();
 509                 if (rv)
 510                         goto use_default_name;
 511         } else {
 512                 int rv;
 513
 514 use_default_name:
 515                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 516                  * the restrictions on phy names.  Probably this call could
 517                  * fail if some other part of the kernel (re)named a device
 518                  * phyX.  But, might should add some locking and check return
 519                  * value, and use a different name if this one exists?
 520                  */
 521                 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 522                 if (rv < 0) {
 523                         kfree(rdev);
 524                         return NULL;
 525                 }
 526         }
 527
 528         mutex_init(&rdev->wiphy.mtx);
 529         INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
 530         INIT_LIST_HEAD(&rdev->beacon_registrations);
 531         spin_lock_init(&rdev->beacon_registrations_lock);
 532         spin_lock_init(&rdev->bss_lock);
 533         INIT_LIST_HEAD(&rdev->bss_list);
 534         INIT_LIST_HEAD(&rdev->sched_scan_req_list);
 535         wiphy_work_init(&rdev->scan_done_wk, __cfg80211_scan_done);
 536         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 537                           cfg80211_dfs_channels_update_work);
 538 #ifdef CONFIG_CFG80211_WEXT
 539         rdev->wiphy.wext = &cfg80211_wext_handler;
 540 #endif
 541
 542         device_initialize(&rdev->wiphy.dev);
 543         rdev->wiphy.dev.class = &ieee80211_class;
 544         rdev->wiphy.dev.platform_data = rdev;
 545         device_enable_async_suspend(&rdev->wiphy.dev);
 546
 547         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 548         wiphy_work_init(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 549         INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
 550         INIT_WORK(&rdev->propagate_radar_detect_wk,
 551                   cfg80211_propagate_radar_detect_wk);
 552         INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
 553         INIT_WORK(&rdev->mgmt_registrations_update_wk,
 554                   cfg80211_mgmt_registrations_update_wk);
 555         spin_lock_init(&rdev->mgmt_registrations_lock);
 556
 557 #ifdef CONFIG_CFG80211_DEFAULT_PS
 558         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 559 #endif
 560
 561         wiphy_net_set(&rdev->wiphy, &init_net);
 562
 563         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 564         rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 565                                           &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 566                                           &rdev->rfkill_ops, rdev);
 567
 568         if (!rdev->wiphy.rfkill) {
 569                 wiphy_free(&rdev->wiphy);
 570                 return NULL;
 571         }
 572
 573         INIT_WORK(&rdev->wiphy_work, cfg80211_wiphy_work);
 574         INIT_LIST_HEAD(&rdev->wiphy_work_list);
 575         spin_lock_init(&rdev->wiphy_work_lock);
 576         INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
 577         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 578         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 579         INIT_WORK(&rdev->background_cac_abort_wk,
 580                   cfg80211_background_cac_abort_wk);
 581         INIT_DELAYED_WORK(&rdev->background_cac_done_wk,
 582                           cfg80211_background_cac_done_wk);
 583
 584         init_waitqueue_head(&rdev->dev_wait);
 585
 586         /*
 587          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 588          * Fragmentation and RTS threshold are disabled by default with the
 589          * special -1 value.
 590          */
 591         rdev->wiphy.retry_short = 7;
 592         rdev->wiphy.retry_long = 4;
 593         rdev->wiphy.frag_threshold = (u32) -1;
 594         rdev->wiphy.rts_threshold = (u32) -1;
 595         rdev->wiphy.coverage_class = 0;
 596
 597         rdev->wiphy.max_num_csa_counters = 1;
 598
 599         rdev->wiphy.max_sched_scan_plans = 1;
 600         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 601
 602         return &rdev->wiphy;
 603 }
 604 EXPORT_SYMBOL(wiphy_new_nm);
 605
 606 static int wiphy_verify_combinations(struct wiphy *wiphy)
 607 {
 608         const struct ieee80211_iface_combination *c;
 609         int i, j;
 610
 611         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 612                 u32 cnt = 0;
 613                 u16 all_iftypes = 0;
 614
 615                 c = &wiphy->iface_combinations[i];
 616
 617                 /*
 618                  * Combinations with just one interface aren't real,
 619                  * however we make an exception for DFS.
 620                  */
 621                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 622                         return -EINVAL;
 623
 624                 /* Need at least one channel */
 625                 if (WARN_ON(!c->num_different_channels))
 626                         return -EINVAL;
 627
 628                 /* DFS only works on one channel. */
 629                 if (WARN_ON(c->radar_detect_widths &&
 630                             (c->num_different_channels > 1)))
 631                         return -EINVAL;
 632
 633                 if (WARN_ON(!c->n_limits))
 634                         return -EINVAL;
 635
 636                 for (j = 0; j < c->n_limits; j++) {
 637                         u16 types = c->limits[j].types;
 638
 639                         /* interface types shouldn't overlap */
 640                         if (WARN_ON(types & all_iftypes))
 641                                 return -EINVAL;
 642                         all_iftypes |= types;
 643
 644                         if (WARN_ON(!c->limits[j].max))
 645                                 return -EINVAL;
 646
 647                         /* Shouldn't list software iftypes in combinations! */
 648                         if (WARN_ON(wiphy->software_iftypes & types))
 649                                 return -EINVAL;
 650
 651                         /* Only a single P2P_DEVICE can be allowed */
 652                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 653                                     c->limits[j].max > 1))
 654                                 return -EINVAL;
 655
 656                         /* Only a single NAN can be allowed */
 657                         if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
 658                                     c->limits[j].max > 1))
 659                                 return -EINVAL;
 660
 661                         /*
 662                          * This isn't well-defined right now. If you have an
 663                          * IBSS interface, then its beacon interval may change
 664                          * by joining other networks, and nothing prevents it
 665                          * from doing that.
 666                          * So technically we probably shouldn't even allow AP
 667                          * and IBSS in the same interface, but it seems that
 668                          * some drivers support that, possibly only with fixed
 669                          * beacon intervals for IBSS.
 670                          */
 671                         if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
 672                                     c->beacon_int_min_gcd)) {
 673                                 return -EINVAL;
 674                         }
 675
 676                         cnt += c->limits[j].max;
 677                         /*
 678                          * Don't advertise an unsupported type
 679                          * in a combination.
 680                          */
 681                         if (WARN_ON((wiphy->interface_modes & types) != types))
 682                                 return -EINVAL;
 683                 }
 684
 685                 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
 686                         return -EINVAL;
 687
 688                 /* You can't even choose that many! */
 689                 if (WARN_ON(cnt < c->max_interfaces))
 690                         return -EINVAL;
 691         }
 692
 693         return 0;
 694 }
 695
 696 int wiphy_register(struct wiphy *wiphy)
 697 {
 698         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 699         int res;
 700         enum nl80211_band band;
 701         struct ieee80211_supported_band *sband;
 702         bool have_band = false;
 703         int i;
 704         u16 ifmodes = wiphy->interface_modes;
 705
 706 #ifdef CONFIG_PM
 707         if (WARN_ON(wiphy->wowlan &&
 708                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 709                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 710                 return -EINVAL;
 711         if (WARN_ON(wiphy->wowlan &&
 712                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 713                     !wiphy->wowlan->tcp))
 714                 return -EINVAL;
 715 #endif
 716         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 717                     (!rdev->ops->tdls_channel_switch ||
 718                      !rdev->ops->tdls_cancel_channel_switch)))
 719                 return -EINVAL;
 720
 721         if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
 722                     (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
 723                      !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
 724                      !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
 725                 return -EINVAL;
 726
 727         if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
 728                 return -EINVAL;
 729
 730         if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
 731                 return -EINVAL;
 732
 733         if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
 734                 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
 735                             !wiphy->pmsr_capa->ftm.non_asap))
 736                         return -EINVAL;
 737                 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
 738                             !wiphy->pmsr_capa->ftm.bandwidths))
 739                         return -EINVAL;
 740                 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
 741                                 ~(BIT(NL80211_PREAMBLE_LEGACY) |
 742                                   BIT(NL80211_PREAMBLE_HT) |
 743                                   BIT(NL80211_PREAMBLE_VHT) |
 744                                   BIT(NL80211_PREAMBLE_HE) |
 745                                   BIT(NL80211_PREAMBLE_DMG))))
 746                         return -EINVAL;
 747                 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
 748                              wiphy->pmsr_capa->ftm.non_trigger_based) &&
 749                             !(wiphy->pmsr_capa->ftm.preambles &
 750                               BIT(NL80211_PREAMBLE_HE))))
 751                         return -EINVAL;
 752                 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
 753                                 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
 754                                   BIT(NL80211_CHAN_WIDTH_20) |
 755                                   BIT(NL80211_CHAN_WIDTH_40) |
 756                                   BIT(NL80211_CHAN_WIDTH_80) |
 757                                   BIT(NL80211_CHAN_WIDTH_80P80) |
 758                                   BIT(NL80211_CHAN_WIDTH_160) |
 759                                   BIT(NL80211_CHAN_WIDTH_5) |
 760                                   BIT(NL80211_CHAN_WIDTH_10))))
 761                         return -EINVAL;
 762         }
 763
 764         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 765                     (wiphy->regulatory_flags &
 766                                         (REGULATORY_CUSTOM_REG |
 767                                          REGULATORY_STRICT_REG |
 768                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 769                                          REGULATORY_COUNTRY_IE_IGNORE))))
 770                 return -EINVAL;
 771
 772         if (WARN_ON(wiphy->coalesce &&
 773                     (!wiphy->coalesce->n_rules ||
 774                      !wiphy->coalesce->n_patterns) &&
 775                     (!wiphy->coalesce->pattern_min_len ||
 776                      wiphy->coalesce->pattern_min_len >
 777                         wiphy->coalesce->pattern_max_len)))
 778                 return -EINVAL;
 779
 780         if (WARN_ON(wiphy->ap_sme_capa &&
 781                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 782                 return -EINVAL;
 783
 784         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 785                 return -EINVAL;
 786
 787         if (WARN_ON(wiphy->addresses &&
 788                     !is_zero_ether_addr(wiphy->perm_addr) &&
 789                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 790                            ETH_ALEN)))
 791                 return -EINVAL;
 792
 793         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 794                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 795                      !rdev->ops->set_mac_acl)))
 796                 return -EINVAL;
 797
 798         /* assure only valid behaviours are flagged by driver
 799          * hence subtract 2 as bit 0 is invalid.
 800          */
 801         if (WARN_ON(wiphy->bss_select_support &&
 802                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 803                 return -EINVAL;
 804
 805         if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
 806                                             NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
 807                     (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
 808                 return -EINVAL;
 809
 810         if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
 811                     rdev->ops->update_connect_params))
 812                 return -EINVAL;
 813
 814         if (wiphy->addresses)
 815                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 816
 817         /* sanity check ifmodes */
 818         WARN_ON(!ifmodes);
 819         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 820         if (WARN_ON(ifmodes != wiphy->interface_modes))
 821                 wiphy->interface_modes = ifmodes;
 822
 823         res = wiphy_verify_combinations(wiphy);
 824         if (res)
 825                 return res;
 826
 827         /* sanity check supported bands/channels */
 828         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 829                 const struct ieee80211_sband_iftype_data *iftd;
 830                 u16 types = 0;
 831                 bool have_he = false;
 832
 833                 sband = wiphy->bands[band];
 834                 if (!sband)
 835                         continue;
 836
 837                 sband->band = band;
 838                 if (WARN_ON(!sband->n_channels))
 839                         return -EINVAL;
 840                 /*
 841                  * on 60GHz or sub-1Ghz band, there are no legacy rates, so
 842                  * n_bitrates is 0
 843                  */
 844                 if (WARN_ON((band != NL80211_BAND_60GHZ &&
 845                              band != NL80211_BAND_S1GHZ) &&
 846                             !sband->n_bitrates))
 847                         return -EINVAL;
 848
 849                 if (WARN_ON(band == NL80211_BAND_6GHZ &&
 850                             (sband->ht_cap.ht_supported ||
 851                              sband->vht_cap.vht_supported)))
 852                         return -EINVAL;
 853
 854                 /*
 855                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 856                  * modify the sband's ht data even if the driver uses a
 857                  * global structure for that.
 858                  */
 859                 if (cfg80211_disable_40mhz_24ghz &&
 860                     band == NL80211_BAND_2GHZ &&
 861                     sband->ht_cap.ht_supported) {
 862                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 863                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 864                 }
 865
 866                 /*
 867                  * Since we use a u32 for rate bitmaps in
 868                  * ieee80211_get_response_rate, we cannot
 869                  * have more than 32 legacy rates.
 870                  */
 871                 if (WARN_ON(sband->n_bitrates > 32))
 872                         return -EINVAL;
 873
 874                 for (i = 0; i < sband->n_channels; i++) {
 875                         sband->channels[i].orig_flags =
 876                                 sband->channels[i].flags;
 877                         sband->channels[i].orig_mag = INT_MAX;
 878                         sband->channels[i].orig_mpwr =
 879                                 sband->channels[i].max_power;
 880                         sband->channels[i].band = band;
 881
 882                         if (WARN_ON(sband->channels[i].freq_offset >= 1000))
 883                                 return -EINVAL;
 884                 }
 885
 886                 for_each_sband_iftype_data(sband, i, iftd) {
 887                         bool has_ap, has_non_ap;
 888                         u32 ap_bits = BIT(NL80211_IFTYPE_AP) |
 889                                       BIT(NL80211_IFTYPE_P2P_GO);
 890
 891                         if (WARN_ON(!iftd->types_mask))
 892                                 return -EINVAL;
 893                         if (WARN_ON(types & iftd->types_mask))
 894                                 return -EINVAL;
 895
 896                         /* at least one piece of information must be present */
 897                         if (WARN_ON(!iftd->he_cap.has_he))
 898                                 return -EINVAL;
 899
 900                         types |= iftd->types_mask;
 901
 902                         if (i == 0)
 903                                 have_he = iftd->he_cap.has_he;
 904                         else
 905                                 have_he = have_he &&
 906                                           iftd->he_cap.has_he;
 907
 908                         has_ap = iftd->types_mask & ap_bits;
 909                         has_non_ap = iftd->types_mask & ~ap_bits;
 910
 911                         /*
 912                          * For EHT 20 MHz STA, the capabilities format differs
 913                          * but to simplify, don't check 20 MHz but rather check
 914                          * only if AP and non-AP were mentioned at the same time,
 915                          * reject if so.
 916                          */
 917                         if (WARN_ON(iftd->eht_cap.has_eht &&
 918                                     has_ap && has_non_ap))
 919                                 return -EINVAL;
 920                 }
 921
 922                 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
 923                         return -EINVAL;
 924
 925                 have_band = true;
 926         }
 927
 928         if (!have_band) {
 929                 WARN_ON(1);
 930                 return -EINVAL;
 931         }
 932
 933         for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
 934                 /*
 935                  * Validate we have a policy (can be explicitly set to
 936                  * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
 937                  * we have at least one of doit/dumpit.
 938                  */
 939                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
 940                         return -EINVAL;
 941                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
 942                             !rdev->wiphy.vendor_commands[i].dumpit))
 943                         return -EINVAL;
 944         }
 945
 946 #ifdef CONFIG_PM
 947         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 948                     (!rdev->wiphy.wowlan->pattern_min_len ||
 949                      rdev->wiphy.wowlan->pattern_min_len >
 950                                 rdev->wiphy.wowlan->pattern_max_len)))
 951                 return -EINVAL;
 952 #endif
 953
 954         if (!wiphy->max_num_akm_suites)
 955                 wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES;
 956         else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES ||
 957                  wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES)
 958                 return -EINVAL;
 959
 960         /* check and set up bitrates */
 961         ieee80211_set_bitrate_flags(wiphy);
 962
 963         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 964
 965         rtnl_lock();
 966         wiphy_lock(&rdev->wiphy);
 967         res = device_add(&rdev->wiphy.dev);
 968         if (res) {
 969                 wiphy_unlock(&rdev->wiphy);
 970                 rtnl_unlock();
 971                 return res;
 972         }
 973
 974         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 975         cfg80211_rdev_list_generation++;
 976
 977         /* add to debugfs */
 978         rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
 979                                                     ieee80211_debugfs_dir);
 980
 981         cfg80211_debugfs_rdev_add(rdev);
 982         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 983         wiphy_unlock(&rdev->wiphy);
 984
 985         /* set up regulatory info */
 986         wiphy_regulatory_register(wiphy);
 987
 988         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 989                 struct regulatory_request request;
 990
 991                 request.wiphy_idx = get_wiphy_idx(wiphy);
 992                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 993                 request.alpha2[0] = '9';
 994                 request.alpha2[1] = '9';
 995
 996                 nl80211_send_reg_change_event(&request);
 997         }
 998
 999         /* Check that nobody globally advertises any capabilities they do not
1000          * advertise on all possible interface types.
1001          */
1002         if (wiphy->extended_capabilities_len &&
1003             wiphy->num_iftype_ext_capab &&
1004             wiphy->iftype_ext_capab) {
1005                 u8 supported_on_all, j;
1006                 const struct wiphy_iftype_ext_capab *capab;
1007
1008                 capab = wiphy->iftype_ext_capab;
1009                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
1010                         if (capab[0].extended_capabilities_len > j)
1011                                 supported_on_all =
1012                                         capab[0].extended_capabilities[j];
1013                         else
1014                                 supported_on_all = 0x00;
1015                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
1016                                 if (j >= capab[i].extended_capabilities_len) {
1017                                         supported_on_all = 0x00;
1018                                         break;
1019                                 }
1020                                 supported_on_all &=
1021                                         capab[i].extended_capabilities[j];
1022                         }
1023                         if (WARN_ON(wiphy->extended_capabilities[j] &
1024                                     ~supported_on_all))
1025                                 break;
1026                 }
1027         }
1028
1029         rdev->wiphy.registered = true;
1030         rtnl_unlock();
1031
1032         res = rfkill_register(rdev->wiphy.rfkill);
1033         if (res) {
1034                 rfkill_destroy(rdev->wiphy.rfkill);
1035                 rdev->wiphy.rfkill = NULL;
1036                 wiphy_unregister(&rdev->wiphy);
1037                 return res;
1038         }
1039
1040         return 0;
1041 }
1042 EXPORT_SYMBOL(wiphy_register);
1043
1044 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
1045 {
1046         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1047
1048         if (!rdev->ops->rfkill_poll)
1049                 return;
1050         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
1051         rfkill_resume_polling(wiphy->rfkill);
1052 }
1053 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
1054
1055 void cfg80211_process_wiphy_works(struct cfg80211_registered_device *rdev,
1056                                   struct wiphy_work *end)
1057 {
1058         unsigned int runaway_limit = 100;
1059         unsigned long flags;
1060
1061         lockdep_assert_held(&rdev->wiphy.mtx);
1062
1063         spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1064         while (!list_empty(&rdev->wiphy_work_list)) {
1065                 struct wiphy_work *wk;
1066
1067                 wk = list_first_entry(&rdev->wiphy_work_list,
1068                                       struct wiphy_work, entry);
1069                 list_del_init(&wk->entry);
1070                 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1071
1072                 trace_wiphy_work_run(&rdev->wiphy, wk);
1073                 wk->func(&rdev->wiphy, wk);
1074
1075                 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1076
1077                 if (wk == end)
1078                         break;
1079
1080                 if (WARN_ON(--runaway_limit == 0))
1081                         INIT_LIST_HEAD(&rdev->wiphy_work_list);
1082         }
1083         spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1084 }
1085
1086 void wiphy_unregister(struct wiphy *wiphy)
1087 {
1088         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1089
1090         wait_event(rdev->dev_wait, ({
1091                 int __count;
1092                 wiphy_lock(&rdev->wiphy);
1093                 __count = rdev->opencount;
1094                 wiphy_unlock(&rdev->wiphy);
1095                 __count == 0; }));
1096
1097         if (rdev->wiphy.rfkill)
1098                 rfkill_unregister(rdev->wiphy.rfkill);
1099
1100         rtnl_lock();
1101         wiphy_lock(&rdev->wiphy);
1102         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1103         rdev->wiphy.registered = false;
1104
1105         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1106
1107         /*
1108          * First remove the hardware from everywhere, this makes
1109          * it impossible to find from userspace.
1110          */
1111         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1112         list_del_rcu(&rdev->list);
1113         synchronize_rcu();
1114
1115         /*
1116          * If this device got a regulatory hint tell core its
1117          * free to listen now to a new shiny device regulatory hint
1118          */
1119         wiphy_regulatory_deregister(wiphy);
1120
1121         cfg80211_rdev_list_generation++;
1122         device_del(&rdev->wiphy.dev);
1123
1124 #ifdef CONFIG_PM
1125         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1126                 rdev_set_wakeup(rdev, false);
1127 #endif
1128
1129         /* surely nothing is reachable now, clean up work */
1130         cfg80211_process_wiphy_works(rdev, NULL);
1131         wiphy_unlock(&rdev->wiphy);
1132         rtnl_unlock();
1133
1134         /* this has nothing to do now but make sure it's gone */
1135         cancel_work_sync(&rdev->wiphy_work);
1136
1137         cancel_work_sync(&rdev->conn_work);
1138         flush_work(&rdev->event_work);
1139         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1140         cancel_delayed_work_sync(&rdev->background_cac_done_wk);
1141         flush_work(&rdev->destroy_work);
1142         flush_work(&rdev->propagate_radar_detect_wk);
1143         flush_work(&rdev->propagate_cac_done_wk);
1144         flush_work(&rdev->mgmt_registrations_update_wk);
1145         flush_work(&rdev->background_cac_abort_wk);
1146
1147         cfg80211_rdev_free_wowlan(rdev);
1148         cfg80211_free_coalesce(rdev->coalesce);
1149         rdev->coalesce = NULL;
1150 }
1151 EXPORT_SYMBOL(wiphy_unregister);
1152
1153 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1154 {
1155         struct cfg80211_internal_bss *scan, *tmp;
1156         struct cfg80211_beacon_registration *reg, *treg;
1157         rfkill_destroy(rdev->wiphy.rfkill);
1158         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1159                 list_del(&reg->list);
1160                 kfree(reg);
1161         }
1162         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1163                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1164         mutex_destroy(&rdev->wiphy.mtx);
1165
1166         /*
1167          * The 'regd' can only be non-NULL if we never finished
1168          * initializing the wiphy and thus never went through the
1169          * unregister path - e.g. in failure scenarios. Thus, it
1170          * cannot have been visible to anyone if non-NULL, so we
1171          * can just free it here.
1172          */
1173         kfree(rcu_dereference_raw(rdev->wiphy.regd));
1174
1175         kfree(rdev);
1176 }
1177
1178 void wiphy_free(struct wiphy *wiphy)
1179 {
1180         put_device(&wiphy->dev);
1181 }
1182 EXPORT_SYMBOL(wiphy_free);
1183
1184 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
1185                                       enum rfkill_hard_block_reasons reason)
1186 {
1187         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1188
1189         if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason))
1190                 schedule_work(&rdev->rfkill_block);
1191 }
1192 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);
1193
1194 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
1195                                       bool unregister_netdev)
1196 {
1197         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1198         struct cfg80211_cqm_config *cqm_config;
1199         unsigned int link_id;
1200
1201         ASSERT_RTNL();
1202         lockdep_assert_held(&rdev->wiphy.mtx);
1203
1204         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1205
1206         wdev->registered = false;
1207
1208         if (wdev->netdev) {
1209                 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
1210                 if (unregister_netdev)
1211                         unregister_netdevice(wdev->netdev);
1212         }
1213
1214         list_del_rcu(&wdev->list);
1215         synchronize_net();
1216         rdev->devlist_generation++;
1217
1218         cfg80211_mlme_purge_registrations(wdev);
1219
1220         switch (wdev->iftype) {
1221         case NL80211_IFTYPE_P2P_DEVICE:
1222                 cfg80211_stop_p2p_device(rdev, wdev);
1223                 break;
1224         case NL80211_IFTYPE_NAN:
1225                 cfg80211_stop_nan(rdev, wdev);
1226                 break;
1227         default:
1228                 break;
1229         }
1230
1231 #ifdef CONFIG_CFG80211_WEXT
1232         kfree_sensitive(wdev->wext.keys);
1233         wdev->wext.keys = NULL;
1234 #endif
1235         wiphy_work_cancel(wdev->wiphy, &wdev->cqm_rssi_work);
1236         /* deleted from the list, so can't be found from nl80211 any more */
1237         cqm_config = rcu_access_pointer(wdev->cqm_config);
1238         kfree_rcu(cqm_config, rcu_head);
1239
1240         /*
1241          * Ensure that all events have been processed and
1242          * freed.
1243          */
1244         cfg80211_process_wdev_events(wdev);
1245
1246         if (wdev->iftype == NL80211_IFTYPE_STATION ||
1247             wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) {
1248                 for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) {
1249                         struct cfg80211_internal_bss *curbss;
1250
1251                         curbss = wdev->links[link_id].client.current_bss;
1252
1253                         if (WARN_ON(curbss)) {
1254                                 cfg80211_unhold_bss(curbss);
1255                                 cfg80211_put_bss(wdev->wiphy, &curbss->pub);
1256                                 wdev->links[link_id].client.current_bss = NULL;
1257                         }
1258                 }
1259         }
1260
1261         wdev->connected = false;
1262 }
1263
1264 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1265 {
1266         _cfg80211_unregister_wdev(wdev, true);
1267 }
1268 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1269
1270 static const struct device_type wiphy_type = {
1271         .name   = "wlan",
1272 };
1273
1274 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1275                                enum nl80211_iftype iftype, int num)
1276 {
1277         lockdep_assert_held(&rdev->wiphy.mtx);
1278
1279         rdev->num_running_ifaces += num;
1280         if (iftype == NL80211_IFTYPE_MONITOR)
1281                 rdev->num_running_monitor_ifaces += num;
1282 }
1283
1284 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1285                     struct wireless_dev *wdev)
1286 {
1287         struct net_device *dev = wdev->netdev;
1288         struct cfg80211_sched_scan_request *pos, *tmp;
1289
1290         lockdep_assert_held(&rdev->wiphy.mtx);
1291
1292         cfg80211_pmsr_wdev_down(wdev);
1293
1294         cfg80211_stop_background_radar_detection(wdev);
1295
1296         switch (wdev->iftype) {
1297         case NL80211_IFTYPE_ADHOC:
1298                 cfg80211_leave_ibss(rdev, dev, true);
1299                 break;
1300         case NL80211_IFTYPE_P2P_CLIENT:
1301         case NL80211_IFTYPE_STATION:
1302                 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1303                                          list) {
1304                         if (dev == pos->dev)
1305                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1306                 }
1307
1308 #ifdef CONFIG_CFG80211_WEXT
1309                 kfree(wdev->wext.ie);
1310                 wdev->wext.ie = NULL;
1311                 wdev->wext.ie_len = 0;
1312                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1313 #endif
1314                 cfg80211_disconnect(rdev, dev,
1315                                     WLAN_REASON_DEAUTH_LEAVING, true);
1316                 break;
1317         case NL80211_IFTYPE_MESH_POINT:
1318                 cfg80211_leave_mesh(rdev, dev);
1319                 break;
1320         case NL80211_IFTYPE_AP:
1321         case NL80211_IFTYPE_P2P_GO:
1322                 cfg80211_stop_ap(rdev, dev, -1, true);
1323                 break;
1324         case NL80211_IFTYPE_OCB:
1325                 cfg80211_leave_ocb(rdev, dev);
1326                 break;
1327         case NL80211_IFTYPE_P2P_DEVICE:
1328         case NL80211_IFTYPE_NAN:
1329                 /* cannot happen, has no netdev */
1330                 break;
1331         case NL80211_IFTYPE_AP_VLAN:
1332         case NL80211_IFTYPE_MONITOR:
1333                 /* nothing to do */
1334                 break;
1335         case NL80211_IFTYPE_UNSPECIFIED:
1336         case NL80211_IFTYPE_WDS:
1337         case NUM_NL80211_IFTYPES:
1338                 /* invalid */
1339                 break;
1340         }
1341 }
1342
1343 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1344                          gfp_t gfp)
1345 {
1346         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1347         struct cfg80211_event *ev;
1348         unsigned long flags;
1349
1350         trace_cfg80211_stop_iface(wiphy, wdev);
1351
1352         ev = kzalloc(sizeof(*ev), gfp);
1353         if (!ev)
1354                 return;
1355
1356         ev->type = EVENT_STOPPED;
1357
1358         spin_lock_irqsave(&wdev->event_lock, flags);
1359         list_add_tail(&ev->list, &wdev->event_list);
1360         spin_unlock_irqrestore(&wdev->event_lock, flags);
1361         queue_work(cfg80211_wq, &rdev->event_work);
1362 }
1363 EXPORT_SYMBOL(cfg80211_stop_iface);
1364
1365 void cfg80211_init_wdev(struct wireless_dev *wdev)
1366 {
1367         INIT_LIST_HEAD(&wdev->event_list);
1368         spin_lock_init(&wdev->event_lock);
1369         INIT_LIST_HEAD(&wdev->mgmt_registrations);
1370         INIT_LIST_HEAD(&wdev->pmsr_list);
1371         spin_lock_init(&wdev->pmsr_lock);
1372         INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1373
1374 #ifdef CONFIG_CFG80211_WEXT
1375         wdev->wext.default_key = -1;
1376         wdev->wext.default_mgmt_key = -1;
1377         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1378 #endif
1379
1380         wiphy_work_init(&wdev->cqm_rssi_work, cfg80211_cqm_rssi_notify_work);
1381
1382         if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1383                 wdev->ps = true;
1384         else
1385                 wdev->ps = false;
1386         /* allow mac80211 to determine the timeout */
1387         wdev->ps_timeout = -1;
1388
1389         if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1390              wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1391              wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1392                 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1393
1394         INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1395 }
1396
1397 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1398                             struct wireless_dev *wdev)
1399 {
1400         ASSERT_RTNL();
1401         lockdep_assert_held(&rdev->wiphy.mtx);
1402
1403         /*
1404          * We get here also when the interface changes network namespaces,
1405          * as it's registered into the new one, but we don't want it to
1406          * change ID in that case. Checking if the ID is already assigned
1407          * works, because 0 isn't considered a valid ID and the memory is
1408          * 0-initialized.
1409          */
1410         if (!wdev->identifier)
1411                 wdev->identifier = ++rdev->wdev_id;
1412         list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1413         rdev->devlist_generation++;
1414         wdev->registered = true;
1415
1416         if (wdev->netdev &&
1417             sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj,
1418                               "phy80211"))
1419                 pr_err("failed to add phy80211 symlink to netdev!\n");
1420
1421         nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1422 }
1423
1424 int cfg80211_register_netdevice(struct net_device *dev)
1425 {
1426         struct wireless_dev *wdev = dev->ieee80211_ptr;
1427         struct cfg80211_registered_device *rdev;
1428         int ret;
1429
1430         ASSERT_RTNL();
1431
1432         if (WARN_ON(!wdev))
1433                 return -EINVAL;
1434
1435         rdev = wiphy_to_rdev(wdev->wiphy);
1436
1437         lockdep_assert_held(&rdev->wiphy.mtx);
1438
1439         /* we'll take care of this */
1440         wdev->registered = true;
1441         wdev->registering = true;
1442         ret = register_netdevice(dev);
1443         if (ret)
1444                 goto out;
1445
1446         cfg80211_register_wdev(rdev, wdev);
1447         ret = 0;
1448 out:
1449         wdev->registering = false;
1450         if (ret)
1451                 wdev->registered = false;
1452         return ret;
1453 }
1454 EXPORT_SYMBOL(cfg80211_register_netdevice);
1455
1456 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1457                                          unsigned long state, void *ptr)
1458 {
1459         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1460         struct wireless_dev *wdev = dev->ieee80211_ptr;
1461         struct cfg80211_registered_device *rdev;
1462         struct cfg80211_sched_scan_request *pos, *tmp;
1463
1464         if (!wdev)
1465                 return NOTIFY_DONE;
1466
1467         rdev = wiphy_to_rdev(wdev->wiphy);
1468
1469         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1470
1471         switch (state) {
1472         case NETDEV_POST_INIT:
1473                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1474                 wdev->netdev = dev;
1475                 /* can only change netns with wiphy */
1476                 dev->netns_local = true;
1477
1478                 cfg80211_init_wdev(wdev);
1479                 break;
1480         case NETDEV_REGISTER:
1481                 if (!wdev->registered) {
1482                         wiphy_lock(&rdev->wiphy);
1483                         cfg80211_register_wdev(rdev, wdev);
1484                         wiphy_unlock(&rdev->wiphy);
1485                 }
1486                 break;
1487         case NETDEV_UNREGISTER:
1488                 /*
1489                  * It is possible to get NETDEV_UNREGISTER multiple times,
1490                  * so check wdev->registered.
1491                  */
1492                 if (wdev->registered && !wdev->registering) {
1493                         wiphy_lock(&rdev->wiphy);
1494                         _cfg80211_unregister_wdev(wdev, false);
1495                         wiphy_unlock(&rdev->wiphy);
1496                 }
1497                 break;
1498         case NETDEV_GOING_DOWN:
1499                 wiphy_lock(&rdev->wiphy);
1500                 cfg80211_leave(rdev, wdev);
1501                 cfg80211_remove_links(wdev);
1502                 wiphy_unlock(&rdev->wiphy);
1503                 /* since we just did cfg80211_leave() nothing to do there */
1504                 cancel_work_sync(&wdev->disconnect_wk);
1505                 cancel_work_sync(&wdev->pmsr_free_wk);
1506                 break;
1507         case NETDEV_DOWN:
1508                 wiphy_lock(&rdev->wiphy);
1509                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1510                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1511                         if (WARN_ON(!rdev->scan_req->notified &&
1512                                     (!rdev->int_scan_req ||
1513                                      !rdev->int_scan_req->notified)))
1514                                 rdev->scan_req->info.aborted = true;
1515                         ___cfg80211_scan_done(rdev, false);
1516                 }
1517
1518                 list_for_each_entry_safe(pos, tmp,
1519                                          &rdev->sched_scan_req_list, list) {
1520                         if (WARN_ON(pos->dev == wdev->netdev))
1521                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1522                 }
1523
1524                 rdev->opencount--;
1525                 wiphy_unlock(&rdev->wiphy);
1526                 wake_up(&rdev->dev_wait);
1527                 break;
1528         case NETDEV_UP:
1529                 wiphy_lock(&rdev->wiphy);
1530                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1531                 switch (wdev->iftype) {
1532 #ifdef CONFIG_CFG80211_WEXT
1533                 case NL80211_IFTYPE_ADHOC:
1534                         cfg80211_ibss_wext_join(rdev, wdev);
1535                         break;
1536                 case NL80211_IFTYPE_STATION:
1537                         cfg80211_mgd_wext_connect(rdev, wdev);
1538                         break;
1539 #endif
1540 #ifdef CONFIG_MAC80211_MESH
1541                 case NL80211_IFTYPE_MESH_POINT:
1542                         {
1543                                 /* backward compat code... */
1544                                 struct mesh_setup setup;
1545                                 memcpy(&setup, &default_mesh_setup,
1546                                                 sizeof(setup));
1547                                  /* back compat only needed for mesh_id */
1548                                 setup.mesh_id = wdev->u.mesh.id;
1549                                 setup.mesh_id_len = wdev->u.mesh.id_up_len;
1550                                 if (wdev->u.mesh.id_up_len)
1551                                         __cfg80211_join_mesh(rdev, dev,
1552                                                         &setup,
1553                                                         &default_mesh_config);
1554                                 break;
1555                         }
1556 #endif
1557                 default:
1558                         break;
1559                 }
1560                 rdev->opencount++;
1561
1562                 /*
1563                  * Configure power management to the driver here so that its
1564                  * correctly set also after interface type changes etc.
1565                  */
1566                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1567                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1568                     rdev->ops->set_power_mgmt &&
1569                     rdev_set_power_mgmt(rdev, dev, wdev->ps,
1570                                         wdev->ps_timeout)) {
1571                         /* assume this means it's off */
1572                         wdev->ps = false;
1573                 }
1574                 wiphy_unlock(&rdev->wiphy);
1575                 break;
1576         case NETDEV_PRE_UP:
1577                 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1578                                              wdev->use_4addr, 0))
1579                         return notifier_from_errno(-EOPNOTSUPP);
1580
1581                 if (rfkill_blocked(rdev->wiphy.rfkill))
1582                         return notifier_from_errno(-ERFKILL);
1583                 break;
1584         default:
1585                 return NOTIFY_DONE;
1586         }
1587
1588         wireless_nlevent_flush();
1589
1590         return NOTIFY_OK;
1591 }
1592
1593 static struct notifier_block cfg80211_netdev_notifier = {
1594         .notifier_call = cfg80211_netdev_notifier_call,
1595 };
1596
1597 static void __net_exit cfg80211_pernet_exit(struct net *net)
1598 {
1599         struct cfg80211_registered_device *rdev;
1600
1601         rtnl_lock();
1602         for_each_rdev(rdev) {
1603                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1604                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1605         }
1606         rtnl_unlock();
1607 }
1608
1609 static struct pernet_operations cfg80211_pernet_ops = {
1610         .exit = cfg80211_pernet_exit,
1611 };
1612
1613 void wiphy_work_queue(struct wiphy *wiphy, struct wiphy_work *work)
1614 {
1615         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1616         unsigned long flags;
1617
1618         trace_wiphy_work_queue(wiphy, work);
1619
1620         spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1621         if (list_empty(&work->entry))
1622                 list_add_tail(&work->entry, &rdev->wiphy_work_list);
1623         spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1624
1625         queue_work(system_unbound_wq, &rdev->wiphy_work);
1626 }
1627 EXPORT_SYMBOL_GPL(wiphy_work_queue);
1628
1629 void wiphy_work_cancel(struct wiphy *wiphy, struct wiphy_work *work)
1630 {
1631         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1632         unsigned long flags;
1633
1634         lockdep_assert_held(&wiphy->mtx);
1635
1636         trace_wiphy_work_cancel(wiphy, work);
1637
1638         spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1639         if (!list_empty(&work->entry))
1640                 list_del_init(&work->entry);
1641         spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1642 }
1643 EXPORT_SYMBOL_GPL(wiphy_work_cancel);
1644
1645 void wiphy_work_flush(struct wiphy *wiphy, struct wiphy_work *work)
1646 {
1647         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1648         unsigned long flags;
1649         bool run;
1650
1651         trace_wiphy_work_flush(wiphy, work);
1652
1653         spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1654         run = !work || !list_empty(&work->entry);
1655         spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1656
1657         if (run)
1658                 cfg80211_process_wiphy_works(rdev, work);
1659 }
1660 EXPORT_SYMBOL_GPL(wiphy_work_flush);
1661
1662 void wiphy_delayed_work_timer(struct timer_list *t)
1663 {
1664         struct wiphy_delayed_work *dwork = from_timer(dwork, t, timer);
1665
1666         wiphy_work_queue(dwork->wiphy, &dwork->work);
1667 }
1668 EXPORT_SYMBOL(wiphy_delayed_work_timer);
1669
1670 void wiphy_delayed_work_queue(struct wiphy *wiphy,
1671                               struct wiphy_delayed_work *dwork,
1672                               unsigned long delay)
1673 {
1674         trace_wiphy_delayed_work_queue(wiphy, &dwork->work, delay);
1675
1676         if (!delay) {
1677                 del_timer(&dwork->timer);
1678                 wiphy_work_queue(wiphy, &dwork->work);
1679                 return;
1680         }
1681
1682         dwork->wiphy = wiphy;
1683         mod_timer(&dwork->timer, jiffies + delay);
1684 }
1685 EXPORT_SYMBOL_GPL(wiphy_delayed_work_queue);
1686
1687 void wiphy_delayed_work_cancel(struct wiphy *wiphy,
1688                                struct wiphy_delayed_work *dwork)
1689 {
1690         lockdep_assert_held(&wiphy->mtx);
1691
1692         del_timer_sync(&dwork->timer);
1693         wiphy_work_cancel(wiphy, &dwork->work);
1694 }
1695 EXPORT_SYMBOL_GPL(wiphy_delayed_work_cancel);
1696
1697 void wiphy_delayed_work_flush(struct wiphy *wiphy,
1698                               struct wiphy_delayed_work *dwork)
1699 {
1700         lockdep_assert_held(&wiphy->mtx);
1701
1702         del_timer_sync(&dwork->timer);
1703         wiphy_work_flush(wiphy, &dwork->work);
1704 }
1705 EXPORT_SYMBOL_GPL(wiphy_delayed_work_flush);
1706
1707 static int __init cfg80211_init(void)
1708 {
1709         int err;
1710
1711         err = register_pernet_device(&cfg80211_pernet_ops);
1712         if (err)
1713                 goto out_fail_pernet;
1714
1715         err = wiphy_sysfs_init();
1716         if (err)
1717                 goto out_fail_sysfs;
1718
1719         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1720         if (err)
1721                 goto out_fail_notifier;
1722
1723         err = nl80211_init();
1724         if (err)
1725                 goto out_fail_nl80211;
1726
1727         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1728
1729         err = regulatory_init();
1730         if (err)
1731                 goto out_fail_reg;
1732
1733         cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1734         if (!cfg80211_wq) {
1735                 err = -ENOMEM;
1736                 goto out_fail_wq;
1737         }
1738
1739         return 0;
1740
1741 out_fail_wq:
1742         regulatory_exit();
1743 out_fail_reg:
1744         debugfs_remove(ieee80211_debugfs_dir);
1745         nl80211_exit();
1746 out_fail_nl80211:
1747         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1748 out_fail_notifier:
1749         wiphy_sysfs_exit();
1750 out_fail_sysfs:
1751         unregister_pernet_device(&cfg80211_pernet_ops);
1752 out_fail_pernet:
1753         return err;
1754 }
1755 fs_initcall(cfg80211_init);
1756
1757 static void __exit cfg80211_exit(void)
1758 {
1759         debugfs_remove(ieee80211_debugfs_dir);
1760         nl80211_exit();
1761         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1762         wiphy_sysfs_exit();
1763         regulatory_exit();
1764         unregister_pernet_device(&cfg80211_pernet_ops);
1765         destroy_workqueue(cfg80211_wq);
1766 }
1767 module_exit(cfg80211_exit);