net/wireless/core.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * This is the linux wireless configuration interface.
   4  *
   5  * Copyright 2006-2010          Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  * Copyright 2015-2017  Intel Deutschland GmbH
   8  * Copyright (C) 2018-2022 Intel Corporation
   9  */
  10
  11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  12
  13 #include <linux/if.h>
  14 #include <linux/module.h>
  15 #include <linux/err.h>
  16 #include <linux/list.h>
  17 #include <linux/slab.h>
  18 #include <linux/nl80211.h>
  19 #include <linux/debugfs.h>
  20 #include <linux/notifier.h>
  21 #include <linux/device.h>
  22 #include <linux/etherdevice.h>
  23 #include <linux/rtnetlink.h>
  24 #include <linux/sched.h>
  25 #include <net/genetlink.h>
  26 #include <net/cfg80211.h>
  27 #include "nl80211.h"
  28 #include "core.h"
  29 #include "sysfs.h"
  30 #include "debugfs.h"
  31 #include "wext-compat.h"
  32 #include "rdev-ops.h"
  33
  34 /* name for sysfs, %d is appended */
  35 #define PHY_NAME "phy"
  36
  37 MODULE_AUTHOR("Johannes Berg");
  38 MODULE_LICENSE("GPL");
  39 MODULE_DESCRIPTION("wireless configuration support");
  40 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
  41
  42 /* RCU-protected (and RTNL for writers) */
  43 LIST_HEAD(cfg80211_rdev_list);
  44 int cfg80211_rdev_list_generation;
  45
  46 /* for debugfs */
  47 static struct dentry *ieee80211_debugfs_dir;
  48
  49 /* for the cleanup, scan and event works */
  50 struct workqueue_struct *cfg80211_wq;
  51
  52 static bool cfg80211_disable_40mhz_24ghz;
  53 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  54 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  55                  "Disable 40MHz support in the 2.4GHz band");
  56
  57 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  58 {
  59         struct cfg80211_registered_device *result = NULL, *rdev;
  60
  61         ASSERT_RTNL();
  62
  63         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  64                 if (rdev->wiphy_idx == wiphy_idx) {
  65                         result = rdev;
  66                         break;
  67                 }
  68         }
  69
  70         return result;
  71 }
  72
  73 int get_wiphy_idx(struct wiphy *wiphy)
  74 {
  75         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
  76
  77         return rdev->wiphy_idx;
  78 }
  79
  80 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  81 {
  82         struct cfg80211_registered_device *rdev;
  83
  84         ASSERT_RTNL();
  85
  86         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  87         if (!rdev)
  88                 return NULL;
  89         return &rdev->wiphy;
  90 }
  91
  92 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
  93                                    const char *newname)
  94 {
  95         struct cfg80211_registered_device *rdev2;
  96         int wiphy_idx, taken = -1, digits;
  97
  98         ASSERT_RTNL();
  99
 100         if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
 101                 return -EINVAL;
 102
 103         /* prohibit calling the thing phy%d when %d is not its number */
 104         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 105         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 106                 /* count number of places needed to print wiphy_idx */
 107                 digits = 1;
 108                 while (wiphy_idx /= 10)
 109                         digits++;
 110                 /*
 111                  * deny the name if it is phy<idx> where <idx> is printed
 112                  * without leading zeroes. taken == strlen(newname) here
 113                  */
 114                 if (taken == strlen(PHY_NAME) + digits)
 115                         return -EINVAL;
 116         }
 117
 118         /* Ensure another device does not already have this name. */
 119         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 120                 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
 121                         return -EINVAL;
 122
 123         return 0;
 124 }
 125
 126 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 127                         char *newname)
 128 {
 129         int result;
 130
 131         ASSERT_RTNL();
 132         lockdep_assert_wiphy(&rdev->wiphy);
 133
 134         /* Ignore nop renames */
 135         if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
 136                 return 0;
 137
 138         result = cfg80211_dev_check_name(rdev, newname);
 139         if (result < 0)
 140                 return result;
 141
 142         result = device_rename(&rdev->wiphy.dev, newname);
 143         if (result)
 144                 return result;
 145
 146         if (!IS_ERR_OR_NULL(rdev->wiphy.debugfsdir))
 147                 debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 148                                rdev->wiphy.debugfsdir,
 149                                rdev->wiphy.debugfsdir->d_parent, newname);
 150
 151         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 152
 153         return 0;
 154 }
 155
 156 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 157                           struct net *net)
 158 {
 159         struct wireless_dev *wdev;
 160         int err = 0;
 161
 162         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 163                 return -EOPNOTSUPP;
 164
 165         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 166                 if (!wdev->netdev)
 167                         continue;
 168                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 169                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 170                 if (err)
 171                         break;
 172                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 173         }
 174
 175         if (err) {
 176                 /* failed -- clean up to old netns */
 177                 net = wiphy_net(&rdev->wiphy);
 178
 179                 list_for_each_entry_continue_reverse(wdev,
 180                                                      &rdev->wiphy.wdev_list,
 181                                                      list) {
 182                         if (!wdev->netdev)
 183                                 continue;
 184                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 185                         err = dev_change_net_namespace(wdev->netdev, net,
 186                                                         "wlan%d");
 187                         WARN_ON(err);
 188                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 189                 }
 190
 191                 return err;
 192         }
 193
 194         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 195                 if (!wdev->netdev)
 196                         continue;
 197                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
 198         }
 199
 200         wiphy_lock(&rdev->wiphy);
 201         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 202
 203         wiphy_net_set(&rdev->wiphy, net);
 204
 205         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 206         WARN_ON(err);
 207
 208         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 209         wiphy_unlock(&rdev->wiphy);
 210
 211         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 212                 if (!wdev->netdev)
 213                         continue;
 214                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
 215         }
 216
 217         return 0;
 218 }
 219
 220 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 221 {
 222         struct cfg80211_registered_device *rdev = data;
 223
 224         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         wiphy_lock(&rdev->wiphy);
 425         if (rdev->suspended)
 426                 goto out;
 427
 428         spin_lock_irq(&rdev->wiphy_work_lock);
 429         wk = list_first_entry_or_null(&rdev->wiphy_work_list,
 430                                       struct wiphy_work, entry);
 431         if (wk) {
 432                 list_del_init(&wk->entry);
 433                 if (!list_empty(&rdev->wiphy_work_list))
 434                         schedule_work(work);
 435                 spin_unlock_irq(&rdev->wiphy_work_lock);
 436
 437                 wk->func(&rdev->wiphy, wk);
 438         } else {
 439                 spin_unlock_irq(&rdev->wiphy_work_lock);
 440         }
 441 out:
 442         wiphy_unlock(&rdev->wiphy);
 443 }
 444
 445 /* exported functions */
 446
 447 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 448                            const char *requested_name)
 449 {
 450         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 451
 452         struct cfg80211_registered_device *rdev;
 453         int alloc_size;
 454
 455         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 456         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 457         WARN_ON(ops->connect && !ops->disconnect);
 458         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 459         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 460         WARN_ON(ops->add_station && !ops->del_station);
 461         WARN_ON(ops->add_mpath && !ops->del_mpath);
 462         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 463         WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
 464         WARN_ON(ops->start_ap && !ops->stop_ap);
 465         WARN_ON(ops->join_ocb && !ops->leave_ocb);
 466         WARN_ON(ops->suspend && !ops->resume);
 467         WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
 468         WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
 469         WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
 470         WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
 471
 472         alloc_size = sizeof(*rdev) + sizeof_priv;
 473
 474         rdev = kzalloc(alloc_size, GFP_KERNEL);
 475         if (!rdev)
 476                 return NULL;
 477
 478         rdev->ops = ops;
 479
 480         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 481
 482         if (unlikely(rdev->wiphy_idx < 0)) {
 483                 /* ugh, wrapped! */
 484                 atomic_dec(&wiphy_counter);
 485                 kfree(rdev);
 486                 return NULL;
 487         }
 488
 489         /* atomic_inc_return makes it start at 1, make it start at 0 */
 490         rdev->wiphy_idx--;
 491
 492         /* give it a proper name */
 493         if (requested_name && requested_name[0]) {
 494                 int rv;
 495
 496                 rtnl_lock();
 497                 rv = cfg80211_dev_check_name(rdev, requested_name);
 498
 499                 if (rv < 0) {
 500                         rtnl_unlock();
 501                         goto use_default_name;
 502                 }
 503
 504                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 505                 rtnl_unlock();
 506                 if (rv)
 507                         goto use_default_name;
 508         } else {
 509                 int rv;
 510
 511 use_default_name:
 512                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 513                  * the restrictions on phy names.  Probably this call could
 514                  * fail if some other part of the kernel (re)named a device
 515                  * phyX.  But, might should add some locking and check return
 516                  * value, and use a different name if this one exists?
 517                  */
 518                 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 519                 if (rv < 0) {
 520                         kfree(rdev);
 521                         return NULL;
 522                 }
 523         }
 524
 525         mutex_init(&rdev->wiphy.mtx);
 526         INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
 527         INIT_LIST_HEAD(&rdev->beacon_registrations);
 528         spin_lock_init(&rdev->beacon_registrations_lock);
 529         spin_lock_init(&rdev->bss_lock);
 530         INIT_LIST_HEAD(&rdev->bss_list);
 531         INIT_LIST_HEAD(&rdev->sched_scan_req_list);
 532         wiphy_work_init(&rdev->scan_done_wk, __cfg80211_scan_done);
 533         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 534                           cfg80211_dfs_channels_update_work);
 535 #ifdef CONFIG_CFG80211_WEXT
 536         rdev->wiphy.wext = &cfg80211_wext_handler;
 537 #endif
 538
 539         device_initialize(&rdev->wiphy.dev);
 540         rdev->wiphy.dev.class = &ieee80211_class;
 541         rdev->wiphy.dev.platform_data = rdev;
 542         device_enable_async_suspend(&rdev->wiphy.dev);
 543
 544         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 545         wiphy_work_init(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 546         INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
 547         INIT_WORK(&rdev->propagate_radar_detect_wk,
 548                   cfg80211_propagate_radar_detect_wk);
 549         INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
 550         INIT_WORK(&rdev->mgmt_registrations_update_wk,
 551                   cfg80211_mgmt_registrations_update_wk);
 552         spin_lock_init(&rdev->mgmt_registrations_lock);
 553
 554 #ifdef CONFIG_CFG80211_DEFAULT_PS
 555         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 556 #endif
 557
 558         wiphy_net_set(&rdev->wiphy, &init_net);
 559
 560         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 561         rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 562                                           &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 563                                           &rdev->rfkill_ops, rdev);
 564
 565         if (!rdev->wiphy.rfkill) {
 566                 wiphy_free(&rdev->wiphy);
 567                 return NULL;
 568         }
 569
 570         INIT_WORK(&rdev->wiphy_work, cfg80211_wiphy_work);
 571         INIT_LIST_HEAD(&rdev->wiphy_work_list);
 572         spin_lock_init(&rdev->wiphy_work_lock);
 573         INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
 574         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 575         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 576         INIT_WORK(&rdev->background_cac_abort_wk,
 577                   cfg80211_background_cac_abort_wk);
 578         INIT_DELAYED_WORK(&rdev->background_cac_done_wk,
 579                           cfg80211_background_cac_done_wk);
 580
 581         init_waitqueue_head(&rdev->dev_wait);
 582
 583         /*
 584          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 585          * Fragmentation and RTS threshold are disabled by default with the
 586          * special -1 value.
 587          */
 588         rdev->wiphy.retry_short = 7;
 589         rdev->wiphy.retry_long = 4;
 590         rdev->wiphy.frag_threshold = (u32) -1;
 591         rdev->wiphy.rts_threshold = (u32) -1;
 592         rdev->wiphy.coverage_class = 0;
 593
 594         rdev->wiphy.max_num_csa_counters = 1;
 595
 596         rdev->wiphy.max_sched_scan_plans = 1;
 597         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 598
 599         return &rdev->wiphy;
 600 }
 601 EXPORT_SYMBOL(wiphy_new_nm);
 602
 603 static int wiphy_verify_combinations(struct wiphy *wiphy)
 604 {
 605         const struct ieee80211_iface_combination *c;
 606         int i, j;
 607
 608         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 609                 u32 cnt = 0;
 610                 u16 all_iftypes = 0;
 611
 612                 c = &wiphy->iface_combinations[i];
 613
 614                 /*
 615                  * Combinations with just one interface aren't real,
 616                  * however we make an exception for DFS.
 617                  */
 618                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 619                         return -EINVAL;
 620
 621                 /* Need at least one channel */
 622                 if (WARN_ON(!c->num_different_channels))
 623                         return -EINVAL;
 624
 625                 /* DFS only works on one channel. */
 626                 if (WARN_ON(c->radar_detect_widths &&
 627                             (c->num_different_channels > 1)))
 628                         return -EINVAL;
 629
 630                 if (WARN_ON(!c->n_limits))
 631                         return -EINVAL;
 632
 633                 for (j = 0; j < c->n_limits; j++) {
 634                         u16 types = c->limits[j].types;
 635
 636                         /* interface types shouldn't overlap */
 637                         if (WARN_ON(types & all_iftypes))
 638                                 return -EINVAL;
 639                         all_iftypes |= types;
 640
 641                         if (WARN_ON(!c->limits[j].max))
 642                                 return -EINVAL;
 643
 644                         /* Shouldn't list software iftypes in combinations! */
 645                         if (WARN_ON(wiphy->software_iftypes & types))
 646                                 return -EINVAL;
 647
 648                         /* Only a single P2P_DEVICE can be allowed */
 649                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 650                                     c->limits[j].max > 1))
 651                                 return -EINVAL;
 652
 653                         /* Only a single NAN can be allowed */
 654                         if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
 655                                     c->limits[j].max > 1))
 656                                 return -EINVAL;
 657
 658                         /*
 659                          * This isn't well-defined right now. If you have an
 660                          * IBSS interface, then its beacon interval may change
 661                          * by joining other networks, and nothing prevents it
 662                          * from doing that.
 663                          * So technically we probably shouldn't even allow AP
 664                          * and IBSS in the same interface, but it seems that
 665                          * some drivers support that, possibly only with fixed
 666                          * beacon intervals for IBSS.
 667                          */
 668                         if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
 669                                     c->beacon_int_min_gcd)) {
 670                                 return -EINVAL;
 671                         }
 672
 673                         cnt += c->limits[j].max;
 674                         /*
 675                          * Don't advertise an unsupported type
 676                          * in a combination.
 677                          */
 678                         if (WARN_ON((wiphy->interface_modes & types) != types))
 679                                 return -EINVAL;
 680                 }
 681
 682                 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
 683                         return -EINVAL;
 684
 685                 /* You can't even choose that many! */
 686                 if (WARN_ON(cnt < c->max_interfaces))
 687                         return -EINVAL;
 688         }
 689
 690         return 0;
 691 }
 692
 693 int wiphy_register(struct wiphy *wiphy)
 694 {
 695         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 696         int res;
 697         enum nl80211_band band;
 698         struct ieee80211_supported_band *sband;
 699         bool have_band = false;
 700         int i;
 701         u16 ifmodes = wiphy->interface_modes;
 702
 703 #ifdef CONFIG_PM
 704         if (WARN_ON(wiphy->wowlan &&
 705                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 706                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 707                 return -EINVAL;
 708         if (WARN_ON(wiphy->wowlan &&
 709                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 710                     !wiphy->wowlan->tcp))
 711                 return -EINVAL;
 712 #endif
 713         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 714                     (!rdev->ops->tdls_channel_switch ||
 715                      !rdev->ops->tdls_cancel_channel_switch)))
 716                 return -EINVAL;
 717
 718         if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
 719                     (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
 720                      !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
 721                      !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
 722                 return -EINVAL;
 723
 724         if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
 725                 return -EINVAL;
 726
 727         if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
 728                 return -EINVAL;
 729
 730         if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
 731                 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
 732                             !wiphy->pmsr_capa->ftm.non_asap))
 733                         return -EINVAL;
 734                 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
 735                             !wiphy->pmsr_capa->ftm.bandwidths))
 736                         return -EINVAL;
 737                 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
 738                                 ~(BIT(NL80211_PREAMBLE_LEGACY) |
 739                                   BIT(NL80211_PREAMBLE_HT) |
 740                                   BIT(NL80211_PREAMBLE_VHT) |
 741                                   BIT(NL80211_PREAMBLE_HE) |
 742                                   BIT(NL80211_PREAMBLE_DMG))))
 743                         return -EINVAL;
 744                 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
 745                              wiphy->pmsr_capa->ftm.non_trigger_based) &&
 746                             !(wiphy->pmsr_capa->ftm.preambles &
 747                               BIT(NL80211_PREAMBLE_HE))))
 748                         return -EINVAL;
 749                 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
 750                                 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
 751                                   BIT(NL80211_CHAN_WIDTH_20) |
 752                                   BIT(NL80211_CHAN_WIDTH_40) |
 753                                   BIT(NL80211_CHAN_WIDTH_80) |
 754                                   BIT(NL80211_CHAN_WIDTH_80P80) |
 755                                   BIT(NL80211_CHAN_WIDTH_160) |
 756                                   BIT(NL80211_CHAN_WIDTH_5) |
 757                                   BIT(NL80211_CHAN_WIDTH_10))))
 758                         return -EINVAL;
 759         }
 760
 761         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 762                     (wiphy->regulatory_flags &
 763                                         (REGULATORY_CUSTOM_REG |
 764                                          REGULATORY_STRICT_REG |
 765                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 766                                          REGULATORY_COUNTRY_IE_IGNORE))))
 767                 return -EINVAL;
 768
 769         if (WARN_ON(wiphy->coalesce &&
 770                     (!wiphy->coalesce->n_rules ||
 771                      !wiphy->coalesce->n_patterns) &&
 772                     (!wiphy->coalesce->pattern_min_len ||
 773                      wiphy->coalesce->pattern_min_len >
 774                         wiphy->coalesce->pattern_max_len)))
 775                 return -EINVAL;
 776
 777         if (WARN_ON(wiphy->ap_sme_capa &&
 778                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 779                 return -EINVAL;
 780
 781         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 782                 return -EINVAL;
 783
 784         if (WARN_ON(wiphy->addresses &&
 785                     !is_zero_ether_addr(wiphy->perm_addr) &&
 786                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 787                            ETH_ALEN)))
 788                 return -EINVAL;
 789
 790         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 791                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 792                      !rdev->ops->set_mac_acl)))
 793                 return -EINVAL;
 794
 795         /* assure only valid behaviours are flagged by driver
 796          * hence subtract 2 as bit 0 is invalid.
 797          */
 798         if (WARN_ON(wiphy->bss_select_support &&
 799                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 800                 return -EINVAL;
 801
 802         if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
 803                                             NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
 804                     (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
 805                 return -EINVAL;
 806
 807         if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
 808                     rdev->ops->update_connect_params))
 809                 return -EINVAL;
 810
 811         if (wiphy->addresses)
 812                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 813
 814         /* sanity check ifmodes */
 815         WARN_ON(!ifmodes);
 816         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 817         if (WARN_ON(ifmodes != wiphy->interface_modes))
 818                 wiphy->interface_modes = ifmodes;
 819
 820         res = wiphy_verify_combinations(wiphy);
 821         if (res)
 822                 return res;
 823
 824         /* sanity check supported bands/channels */
 825         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 826                 u16 types = 0;
 827                 bool have_he = false;
 828
 829                 sband = wiphy->bands[band];
 830                 if (!sband)
 831                         continue;
 832
 833                 sband->band = band;
 834                 if (WARN_ON(!sband->n_channels))
 835                         return -EINVAL;
 836                 /*
 837                  * on 60GHz or sub-1Ghz band, there are no legacy rates, so
 838                  * n_bitrates is 0
 839                  */
 840                 if (WARN_ON((band != NL80211_BAND_60GHZ &&
 841                              band != NL80211_BAND_S1GHZ) &&
 842                             !sband->n_bitrates))
 843                         return -EINVAL;
 844
 845                 if (WARN_ON(band == NL80211_BAND_6GHZ &&
 846                             (sband->ht_cap.ht_supported ||
 847                              sband->vht_cap.vht_supported)))
 848                         return -EINVAL;
 849
 850                 /*
 851                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 852                  * modify the sband's ht data even if the driver uses a
 853                  * global structure for that.
 854                  */
 855                 if (cfg80211_disable_40mhz_24ghz &&
 856                     band == NL80211_BAND_2GHZ &&
 857                     sband->ht_cap.ht_supported) {
 858                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 859                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 860                 }
 861
 862                 /*
 863                  * Since we use a u32 for rate bitmaps in
 864                  * ieee80211_get_response_rate, we cannot
 865                  * have more than 32 legacy rates.
 866                  */
 867                 if (WARN_ON(sband->n_bitrates > 32))
 868                         return -EINVAL;
 869
 870                 for (i = 0; i < sband->n_channels; i++) {
 871                         sband->channels[i].orig_flags =
 872                                 sband->channels[i].flags;
 873                         sband->channels[i].orig_mag = INT_MAX;
 874                         sband->channels[i].orig_mpwr =
 875                                 sband->channels[i].max_power;
 876                         sband->channels[i].band = band;
 877
 878                         if (WARN_ON(sband->channels[i].freq_offset >= 1000))
 879                                 return -EINVAL;
 880                 }
 881
 882                 for (i = 0; i < sband->n_iftype_data; i++) {
 883                         const struct ieee80211_sband_iftype_data *iftd;
 884                         bool has_ap, has_non_ap;
 885                         u32 ap_bits = BIT(NL80211_IFTYPE_AP) |
 886                                       BIT(NL80211_IFTYPE_P2P_GO);
 887
 888                         iftd = &sband->iftype_data[i];
 889
 890                         if (WARN_ON(!iftd->types_mask))
 891                                 return -EINVAL;
 892                         if (WARN_ON(types & iftd->types_mask))
 893                                 return -EINVAL;
 894
 895                         /* at least one piece of information must be present */
 896                         if (WARN_ON(!iftd->he_cap.has_he))
 897                                 return -EINVAL;
 898
 899                         types |= iftd->types_mask;
 900
 901                         if (i == 0)
 902                                 have_he = iftd->he_cap.has_he;
 903                         else
 904                                 have_he = have_he &&
 905                                           iftd->he_cap.has_he;
 906
 907                         has_ap = iftd->types_mask & ap_bits;
 908                         has_non_ap = iftd->types_mask & ~ap_bits;
 909
 910                         /*
 911                          * For EHT 20 MHz STA, the capabilities format differs
 912                          * but to simplify, don't check 20 MHz but rather check
 913                          * only if AP and non-AP were mentioned at the same time,
 914                          * reject if so.
 915                          */
 916                         if (WARN_ON(iftd->eht_cap.has_eht &&
 917                                     has_ap && has_non_ap))
 918                                 return -EINVAL;
 919                 }
 920
 921                 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
 922                         return -EINVAL;
 923
 924                 have_band = true;
 925         }
 926
 927         if (!have_band) {
 928                 WARN_ON(1);
 929                 return -EINVAL;
 930         }
 931
 932         for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
 933                 /*
 934                  * Validate we have a policy (can be explicitly set to
 935                  * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
 936                  * we have at least one of doit/dumpit.
 937                  */
 938                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
 939                         return -EINVAL;
 940                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
 941                             !rdev->wiphy.vendor_commands[i].dumpit))
 942                         return -EINVAL;
 943         }
 944
 945 #ifdef CONFIG_PM
 946         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 947                     (!rdev->wiphy.wowlan->pattern_min_len ||
 948                      rdev->wiphy.wowlan->pattern_min_len >
 949                                 rdev->wiphy.wowlan->pattern_max_len)))
 950                 return -EINVAL;
 951 #endif
 952
 953         if (!wiphy->max_num_akm_suites)
 954                 wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES;
 955         else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES ||
 956                  wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES)
 957                 return -EINVAL;
 958
 959         /* check and set up bitrates */
 960         ieee80211_set_bitrate_flags(wiphy);
 961
 962         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 963
 964         rtnl_lock();
 965         wiphy_lock(&rdev->wiphy);
 966         res = device_add(&rdev->wiphy.dev);
 967         if (res) {
 968                 wiphy_unlock(&rdev->wiphy);
 969                 rtnl_unlock();
 970                 return res;
 971         }
 972
 973         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 974         cfg80211_rdev_list_generation++;
 975
 976         /* add to debugfs */
 977         rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
 978                                                     ieee80211_debugfs_dir);
 979
 980         cfg80211_debugfs_rdev_add(rdev);
 981         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 982         wiphy_unlock(&rdev->wiphy);
 983
 984         /* set up regulatory info */
 985         wiphy_regulatory_register(wiphy);
 986
 987         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 988                 struct regulatory_request request;
 989
 990                 request.wiphy_idx = get_wiphy_idx(wiphy);
 991                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 992                 request.alpha2[0] = '9';
 993                 request.alpha2[1] = '9';
 994
 995                 nl80211_send_reg_change_event(&request);
 996         }
 997
 998         /* Check that nobody globally advertises any capabilities they do not
 999          * advertise on all possible interface types.
1000          */
1001         if (wiphy->extended_capabilities_len &&
1002             wiphy->num_iftype_ext_capab &&
1003             wiphy->iftype_ext_capab) {
1004                 u8 supported_on_all, j;
1005                 const struct wiphy_iftype_ext_capab *capab;
1006
1007                 capab = wiphy->iftype_ext_capab;
1008                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
1009                         if (capab[0].extended_capabilities_len > j)
1010                                 supported_on_all =
1011                                         capab[0].extended_capabilities[j];
1012                         else
1013                                 supported_on_all = 0x00;
1014                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
1015                                 if (j >= capab[i].extended_capabilities_len) {
1016                                         supported_on_all = 0x00;
1017                                         break;
1018                                 }
1019                                 supported_on_all &=
1020                                         capab[i].extended_capabilities[j];
1021                         }
1022                         if (WARN_ON(wiphy->extended_capabilities[j] &
1023                                     ~supported_on_all))
1024                                 break;
1025                 }
1026         }
1027
1028         rdev->wiphy.registered = true;
1029         rtnl_unlock();
1030
1031         res = rfkill_register(rdev->wiphy.rfkill);
1032         if (res) {
1033                 rfkill_destroy(rdev->wiphy.rfkill);
1034                 rdev->wiphy.rfkill = NULL;
1035                 wiphy_unregister(&rdev->wiphy);
1036                 return res;
1037         }
1038
1039         return 0;
1040 }
1041 EXPORT_SYMBOL(wiphy_register);
1042
1043 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
1044 {
1045         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1046
1047         if (!rdev->ops->rfkill_poll)
1048                 return;
1049         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
1050         rfkill_resume_polling(wiphy->rfkill);
1051 }
1052 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
1053
1054 void cfg80211_process_wiphy_works(struct cfg80211_registered_device *rdev,
1055                                   struct wiphy_work *end)
1056 {
1057         unsigned int runaway_limit = 100;
1058         unsigned long flags;
1059
1060         lockdep_assert_held(&rdev->wiphy.mtx);
1061
1062         spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1063         while (!list_empty(&rdev->wiphy_work_list)) {
1064                 struct wiphy_work *wk;
1065
1066                 wk = list_first_entry(&rdev->wiphy_work_list,
1067                                       struct wiphy_work, entry);
1068                 list_del_init(&wk->entry);
1069                 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1070
1071                 wk->func(&rdev->wiphy, wk);
1072
1073                 spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1074
1075                 if (wk == end)
1076                         break;
1077
1078                 if (WARN_ON(--runaway_limit == 0))
1079                         INIT_LIST_HEAD(&rdev->wiphy_work_list);
1080         }
1081         spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1082 }
1083
1084 void wiphy_unregister(struct wiphy *wiphy)
1085 {
1086         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1087
1088         wait_event(rdev->dev_wait, ({
1089                 int __count;
1090                 wiphy_lock(&rdev->wiphy);
1091                 __count = rdev->opencount;
1092                 wiphy_unlock(&rdev->wiphy);
1093                 __count == 0; }));
1094
1095         if (rdev->wiphy.rfkill)
1096                 rfkill_unregister(rdev->wiphy.rfkill);
1097
1098         rtnl_lock();
1099         wiphy_lock(&rdev->wiphy);
1100         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1101         rdev->wiphy.registered = false;
1102
1103         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1104
1105         /*
1106          * First remove the hardware from everywhere, this makes
1107          * it impossible to find from userspace.
1108          */
1109         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1110         list_del_rcu(&rdev->list);
1111         synchronize_rcu();
1112
1113         /*
1114          * If this device got a regulatory hint tell core its
1115          * free to listen now to a new shiny device regulatory hint
1116          */
1117         wiphy_regulatory_deregister(wiphy);
1118
1119         cfg80211_rdev_list_generation++;
1120         device_del(&rdev->wiphy.dev);
1121
1122 #ifdef CONFIG_PM
1123         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1124                 rdev_set_wakeup(rdev, false);
1125 #endif
1126
1127         /* surely nothing is reachable now, clean up work */
1128         cfg80211_process_wiphy_works(rdev, NULL);
1129         wiphy_unlock(&rdev->wiphy);
1130         rtnl_unlock();
1131
1132         /* this has nothing to do now but make sure it's gone */
1133         cancel_work_sync(&rdev->wiphy_work);
1134
1135         cancel_work_sync(&rdev->conn_work);
1136         flush_work(&rdev->event_work);
1137         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1138         cancel_delayed_work_sync(&rdev->background_cac_done_wk);
1139         flush_work(&rdev->destroy_work);
1140         flush_work(&rdev->propagate_radar_detect_wk);
1141         flush_work(&rdev->propagate_cac_done_wk);
1142         flush_work(&rdev->mgmt_registrations_update_wk);
1143         flush_work(&rdev->background_cac_abort_wk);
1144
1145         cfg80211_rdev_free_wowlan(rdev);
1146         cfg80211_rdev_free_coalesce(rdev);
1147 }
1148 EXPORT_SYMBOL(wiphy_unregister);
1149
1150 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1151 {
1152         struct cfg80211_internal_bss *scan, *tmp;
1153         struct cfg80211_beacon_registration *reg, *treg;
1154         rfkill_destroy(rdev->wiphy.rfkill);
1155         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1156                 list_del(&reg->list);
1157                 kfree(reg);
1158         }
1159         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1160                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1161         mutex_destroy(&rdev->wiphy.mtx);
1162
1163         /*
1164          * The 'regd' can only be non-NULL if we never finished
1165          * initializing the wiphy and thus never went through the
1166          * unregister path - e.g. in failure scenarios. Thus, it
1167          * cannot have been visible to anyone if non-NULL, so we
1168          * can just free it here.
1169          */
1170         kfree(rcu_dereference_raw(rdev->wiphy.regd));
1171
1172         kfree(rdev);
1173 }
1174
1175 void wiphy_free(struct wiphy *wiphy)
1176 {
1177         put_device(&wiphy->dev);
1178 }
1179 EXPORT_SYMBOL(wiphy_free);
1180
1181 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
1182                                       enum rfkill_hard_block_reasons reason)
1183 {
1184         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1185
1186         if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason))
1187                 schedule_work(&rdev->rfkill_block);
1188 }
1189 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);
1190
1191 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
1192                                       bool unregister_netdev)
1193 {
1194         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1195         struct cfg80211_cqm_config *cqm_config;
1196         unsigned int link_id;
1197
1198         ASSERT_RTNL();
1199         lockdep_assert_held(&rdev->wiphy.mtx);
1200
1201         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1202
1203         wdev->registered = false;
1204
1205         if (wdev->netdev) {
1206                 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
1207                 if (unregister_netdev)
1208                         unregister_netdevice(wdev->netdev);
1209         }
1210
1211         list_del_rcu(&wdev->list);
1212         synchronize_net();
1213         rdev->devlist_generation++;
1214
1215         cfg80211_mlme_purge_registrations(wdev);
1216
1217         switch (wdev->iftype) {
1218         case NL80211_IFTYPE_P2P_DEVICE:
1219                 cfg80211_stop_p2p_device(rdev, wdev);
1220                 break;
1221         case NL80211_IFTYPE_NAN:
1222                 cfg80211_stop_nan(rdev, wdev);
1223                 break;
1224         default:
1225                 break;
1226         }
1227
1228 #ifdef CONFIG_CFG80211_WEXT
1229         kfree_sensitive(wdev->wext.keys);
1230         wdev->wext.keys = NULL;
1231 #endif
1232         wiphy_work_cancel(wdev->wiphy, &wdev->cqm_rssi_work);
1233         /* deleted from the list, so can't be found from nl80211 any more */
1234         cqm_config = rcu_access_pointer(wdev->cqm_config);
1235         kfree_rcu(cqm_config, rcu_head);
1236
1237         /*
1238          * Ensure that all events have been processed and
1239          * freed.
1240          */
1241         cfg80211_process_wdev_events(wdev);
1242
1243         if (wdev->iftype == NL80211_IFTYPE_STATION ||
1244             wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) {
1245                 for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) {
1246                         struct cfg80211_internal_bss *curbss;
1247
1248                         curbss = wdev->links[link_id].client.current_bss;
1249
1250                         if (WARN_ON(curbss)) {
1251                                 cfg80211_unhold_bss(curbss);
1252                                 cfg80211_put_bss(wdev->wiphy, &curbss->pub);
1253                                 wdev->links[link_id].client.current_bss = NULL;
1254                         }
1255                 }
1256         }
1257
1258         wdev->connected = false;
1259 }
1260
1261 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1262 {
1263         _cfg80211_unregister_wdev(wdev, true);
1264 }
1265 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1266
1267 static const struct device_type wiphy_type = {
1268         .name   = "wlan",
1269 };
1270
1271 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1272                                enum nl80211_iftype iftype, int num)
1273 {
1274         lockdep_assert_held(&rdev->wiphy.mtx);
1275
1276         rdev->num_running_ifaces += num;
1277         if (iftype == NL80211_IFTYPE_MONITOR)
1278                 rdev->num_running_monitor_ifaces += num;
1279 }
1280
1281 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1282                       struct wireless_dev *wdev)
1283 {
1284         struct net_device *dev = wdev->netdev;
1285         struct cfg80211_sched_scan_request *pos, *tmp;
1286
1287         lockdep_assert_held(&rdev->wiphy.mtx);
1288         ASSERT_WDEV_LOCK(wdev);
1289
1290         cfg80211_pmsr_wdev_down(wdev);
1291
1292         cfg80211_stop_background_radar_detection(wdev);
1293
1294         switch (wdev->iftype) {
1295         case NL80211_IFTYPE_ADHOC:
1296                 __cfg80211_leave_ibss(rdev, dev, true);
1297                 break;
1298         case NL80211_IFTYPE_P2P_CLIENT:
1299         case NL80211_IFTYPE_STATION:
1300                 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1301                                          list) {
1302                         if (dev == pos->dev)
1303                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1304                 }
1305
1306 #ifdef CONFIG_CFG80211_WEXT
1307                 kfree(wdev->wext.ie);
1308                 wdev->wext.ie = NULL;
1309                 wdev->wext.ie_len = 0;
1310                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1311 #endif
1312                 cfg80211_disconnect(rdev, dev,
1313                                     WLAN_REASON_DEAUTH_LEAVING, true);
1314                 break;
1315         case NL80211_IFTYPE_MESH_POINT:
1316                 __cfg80211_leave_mesh(rdev, dev);
1317                 break;
1318         case NL80211_IFTYPE_AP:
1319         case NL80211_IFTYPE_P2P_GO:
1320                 __cfg80211_stop_ap(rdev, dev, -1, true);
1321                 break;
1322         case NL80211_IFTYPE_OCB:
1323                 __cfg80211_leave_ocb(rdev, dev);
1324                 break;
1325         case NL80211_IFTYPE_P2P_DEVICE:
1326         case NL80211_IFTYPE_NAN:
1327                 /* cannot happen, has no netdev */
1328                 break;
1329         case NL80211_IFTYPE_AP_VLAN:
1330         case NL80211_IFTYPE_MONITOR:
1331                 /* nothing to do */
1332                 break;
1333         case NL80211_IFTYPE_UNSPECIFIED:
1334         case NL80211_IFTYPE_WDS:
1335         case NUM_NL80211_IFTYPES:
1336                 /* invalid */
1337                 break;
1338         }
1339 }
1340
1341 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1342                     struct wireless_dev *wdev)
1343 {
1344         wdev_lock(wdev);
1345         __cfg80211_leave(rdev, wdev);
1346         wdev_unlock(wdev);
1347 }
1348
1349 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1350                          gfp_t gfp)
1351 {
1352         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1353         struct cfg80211_event *ev;
1354         unsigned long flags;
1355
1356         trace_cfg80211_stop_iface(wiphy, wdev);
1357
1358         ev = kzalloc(sizeof(*ev), gfp);
1359         if (!ev)
1360                 return;
1361
1362         ev->type = EVENT_STOPPED;
1363
1364         spin_lock_irqsave(&wdev->event_lock, flags);
1365         list_add_tail(&ev->list, &wdev->event_list);
1366         spin_unlock_irqrestore(&wdev->event_lock, flags);
1367         queue_work(cfg80211_wq, &rdev->event_work);
1368 }
1369 EXPORT_SYMBOL(cfg80211_stop_iface);
1370
1371 void cfg80211_init_wdev(struct wireless_dev *wdev)
1372 {
1373         mutex_init(&wdev->mtx);
1374         INIT_LIST_HEAD(&wdev->event_list);
1375         spin_lock_init(&wdev->event_lock);
1376         INIT_LIST_HEAD(&wdev->mgmt_registrations);
1377         INIT_LIST_HEAD(&wdev->pmsr_list);
1378         spin_lock_init(&wdev->pmsr_lock);
1379         INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1380
1381 #ifdef CONFIG_CFG80211_WEXT
1382         wdev->wext.default_key = -1;
1383         wdev->wext.default_mgmt_key = -1;
1384         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1385 #endif
1386
1387         wiphy_work_init(&wdev->cqm_rssi_work, cfg80211_cqm_rssi_notify_work);
1388
1389         if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1390                 wdev->ps = true;
1391         else
1392                 wdev->ps = false;
1393         /* allow mac80211 to determine the timeout */
1394         wdev->ps_timeout = -1;
1395
1396         if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1397              wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1398              wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1399                 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1400
1401         INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1402 }
1403
1404 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1405                             struct wireless_dev *wdev)
1406 {
1407         ASSERT_RTNL();
1408         lockdep_assert_held(&rdev->wiphy.mtx);
1409
1410         /*
1411          * We get here also when the interface changes network namespaces,
1412          * as it's registered into the new one, but we don't want it to
1413          * change ID in that case. Checking if the ID is already assigned
1414          * works, because 0 isn't considered a valid ID and the memory is
1415          * 0-initialized.
1416          */
1417         if (!wdev->identifier)
1418                 wdev->identifier = ++rdev->wdev_id;
1419         list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1420         rdev->devlist_generation++;
1421         wdev->registered = true;
1422
1423         if (wdev->netdev &&
1424             sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj,
1425                               "phy80211"))
1426                 pr_err("failed to add phy80211 symlink to netdev!\n");
1427
1428         nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1429 }
1430
1431 int cfg80211_register_netdevice(struct net_device *dev)
1432 {
1433         struct wireless_dev *wdev = dev->ieee80211_ptr;
1434         struct cfg80211_registered_device *rdev;
1435         int ret;
1436
1437         ASSERT_RTNL();
1438
1439         if (WARN_ON(!wdev))
1440                 return -EINVAL;
1441
1442         rdev = wiphy_to_rdev(wdev->wiphy);
1443
1444         lockdep_assert_held(&rdev->wiphy.mtx);
1445
1446         /* we'll take care of this */
1447         wdev->registered = true;
1448         wdev->registering = true;
1449         ret = register_netdevice(dev);
1450         if (ret)
1451                 goto out;
1452
1453         cfg80211_register_wdev(rdev, wdev);
1454         ret = 0;
1455 out:
1456         wdev->registering = false;
1457         if (ret)
1458                 wdev->registered = false;
1459         return ret;
1460 }
1461 EXPORT_SYMBOL(cfg80211_register_netdevice);
1462
1463 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1464                                          unsigned long state, void *ptr)
1465 {
1466         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1467         struct wireless_dev *wdev = dev->ieee80211_ptr;
1468         struct cfg80211_registered_device *rdev;
1469         struct cfg80211_sched_scan_request *pos, *tmp;
1470
1471         if (!wdev)
1472                 return NOTIFY_DONE;
1473
1474         rdev = wiphy_to_rdev(wdev->wiphy);
1475
1476         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1477
1478         switch (state) {
1479         case NETDEV_POST_INIT:
1480                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1481                 wdev->netdev = dev;
1482                 /* can only change netns with wiphy */
1483                 dev->features |= NETIF_F_NETNS_LOCAL;
1484
1485                 cfg80211_init_wdev(wdev);
1486                 break;
1487         case NETDEV_REGISTER:
1488                 if (!wdev->registered) {
1489                         wiphy_lock(&rdev->wiphy);
1490                         cfg80211_register_wdev(rdev, wdev);
1491                         wiphy_unlock(&rdev->wiphy);
1492                 }
1493                 break;
1494         case NETDEV_UNREGISTER:
1495                 /*
1496                  * It is possible to get NETDEV_UNREGISTER multiple times,
1497                  * so check wdev->registered.
1498                  */
1499                 if (wdev->registered && !wdev->registering) {
1500                         wiphy_lock(&rdev->wiphy);
1501                         _cfg80211_unregister_wdev(wdev, false);
1502                         wiphy_unlock(&rdev->wiphy);
1503                 }
1504                 break;
1505         case NETDEV_GOING_DOWN:
1506                 wiphy_lock(&rdev->wiphy);
1507                 cfg80211_leave(rdev, wdev);
1508                 cfg80211_remove_links(wdev);
1509                 wiphy_unlock(&rdev->wiphy);
1510                 /* since we just did cfg80211_leave() nothing to do there */
1511                 cancel_work_sync(&wdev->disconnect_wk);
1512                 cancel_work_sync(&wdev->pmsr_free_wk);
1513                 break;
1514         case NETDEV_DOWN:
1515                 wiphy_lock(&rdev->wiphy);
1516                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1517                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1518                         if (WARN_ON(!rdev->scan_req->notified &&
1519                                     (!rdev->int_scan_req ||
1520                                      !rdev->int_scan_req->notified)))
1521                                 rdev->scan_req->info.aborted = true;
1522                         ___cfg80211_scan_done(rdev, false);
1523                 }
1524
1525                 list_for_each_entry_safe(pos, tmp,
1526                                          &rdev->sched_scan_req_list, list) {
1527                         if (WARN_ON(pos->dev == wdev->netdev))
1528                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1529                 }
1530
1531                 rdev->opencount--;
1532                 wiphy_unlock(&rdev->wiphy);
1533                 wake_up(&rdev->dev_wait);
1534                 break;
1535         case NETDEV_UP:
1536                 wiphy_lock(&rdev->wiphy);
1537                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1538                 wdev_lock(wdev);
1539                 switch (wdev->iftype) {
1540 #ifdef CONFIG_CFG80211_WEXT
1541                 case NL80211_IFTYPE_ADHOC:
1542                         cfg80211_ibss_wext_join(rdev, wdev);
1543                         break;
1544                 case NL80211_IFTYPE_STATION:
1545                         cfg80211_mgd_wext_connect(rdev, wdev);
1546                         break;
1547 #endif
1548 #ifdef CONFIG_MAC80211_MESH
1549                 case NL80211_IFTYPE_MESH_POINT:
1550                         {
1551                                 /* backward compat code... */
1552                                 struct mesh_setup setup;
1553                                 memcpy(&setup, &default_mesh_setup,
1554                                                 sizeof(setup));
1555                                  /* back compat only needed for mesh_id */
1556                                 setup.mesh_id = wdev->u.mesh.id;
1557                                 setup.mesh_id_len = wdev->u.mesh.id_up_len;
1558                                 if (wdev->u.mesh.id_up_len)
1559                                         __cfg80211_join_mesh(rdev, dev,
1560                                                         &setup,
1561                                                         &default_mesh_config);
1562                                 break;
1563                         }
1564 #endif
1565                 default:
1566                         break;
1567                 }
1568                 wdev_unlock(wdev);
1569                 rdev->opencount++;
1570
1571                 /*
1572                  * Configure power management to the driver here so that its
1573                  * correctly set also after interface type changes etc.
1574                  */
1575                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1576                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1577                     rdev->ops->set_power_mgmt &&
1578                     rdev_set_power_mgmt(rdev, dev, wdev->ps,
1579                                         wdev->ps_timeout)) {
1580                         /* assume this means it's off */
1581                         wdev->ps = false;
1582                 }
1583                 wiphy_unlock(&rdev->wiphy);
1584                 break;
1585         case NETDEV_PRE_UP:
1586                 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1587                                              wdev->use_4addr, 0))
1588                         return notifier_from_errno(-EOPNOTSUPP);
1589
1590                 if (rfkill_blocked(rdev->wiphy.rfkill))
1591                         return notifier_from_errno(-ERFKILL);
1592                 break;
1593         default:
1594                 return NOTIFY_DONE;
1595         }
1596
1597         wireless_nlevent_flush();
1598
1599         return NOTIFY_OK;
1600 }
1601
1602 static struct notifier_block cfg80211_netdev_notifier = {
1603         .notifier_call = cfg80211_netdev_notifier_call,
1604 };
1605
1606 static void __net_exit cfg80211_pernet_exit(struct net *net)
1607 {
1608         struct cfg80211_registered_device *rdev;
1609
1610         rtnl_lock();
1611         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1612                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1613                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1614         }
1615         rtnl_unlock();
1616 }
1617
1618 static struct pernet_operations cfg80211_pernet_ops = {
1619         .exit = cfg80211_pernet_exit,
1620 };
1621
1622 void wiphy_work_queue(struct wiphy *wiphy, struct wiphy_work *work)
1623 {
1624         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1625         unsigned long flags;
1626
1627         spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1628         if (list_empty(&work->entry))
1629                 list_add_tail(&work->entry, &rdev->wiphy_work_list);
1630         spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1631
1632         queue_work(system_unbound_wq, &rdev->wiphy_work);
1633 }
1634 EXPORT_SYMBOL_GPL(wiphy_work_queue);
1635
1636 void wiphy_work_cancel(struct wiphy *wiphy, struct wiphy_work *work)
1637 {
1638         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1639         unsigned long flags;
1640
1641         lockdep_assert_held(&wiphy->mtx);
1642
1643         spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1644         if (!list_empty(&work->entry))
1645                 list_del_init(&work->entry);
1646         spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1647 }
1648 EXPORT_SYMBOL_GPL(wiphy_work_cancel);
1649
1650 void wiphy_work_flush(struct wiphy *wiphy, struct wiphy_work *work)
1651 {
1652         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1653         unsigned long flags;
1654         bool run;
1655
1656         spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1657         run = !work || !list_empty(&work->entry);
1658         spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1659
1660         if (run)
1661                 cfg80211_process_wiphy_works(rdev, work);
1662 }
1663 EXPORT_SYMBOL_GPL(wiphy_work_flush);
1664
1665 void wiphy_delayed_work_timer(struct timer_list *t)
1666 {
1667         struct wiphy_delayed_work *dwork = from_timer(dwork, t, timer);
1668
1669         wiphy_work_queue(dwork->wiphy, &dwork->work);
1670 }
1671 EXPORT_SYMBOL(wiphy_delayed_work_timer);
1672
1673 void wiphy_delayed_work_queue(struct wiphy *wiphy,
1674                               struct wiphy_delayed_work *dwork,
1675                               unsigned long delay)
1676 {
1677         if (!delay) {
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);