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) 2018-2020 Intel Corporation
   9  */
  10
  11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  12
  13 #include <linux/if.h>
  14 #include <linux/module.h>
  15 #include <linux/err.h>
  16 #include <linux/list.h>
  17 #include <linux/slab.h>
  18 #include <linux/nl80211.h>
  19 #include <linux/debugfs.h>
  20 #include <linux/notifier.h>
  21 #include <linux/device.h>
  22 #include <linux/etherdevice.h>
  23 #include <linux/rtnetlink.h>
  24 #include <linux/sched.h>
  25 #include <net/genetlink.h>
  26 #include <net/cfg80211.h>
  27 #include "nl80211.h"
  28 #include "core.h"
  29 #include "sysfs.h"
  30 #include "debugfs.h"
  31 #include "wext-compat.h"
  32 #include "rdev-ops.h"
  33
  34 /* name for sysfs, %d is appended */
  35 #define PHY_NAME "phy"
  36
  37 MODULE_AUTHOR("Johannes Berg");
  38 MODULE_LICENSE("GPL");
  39 MODULE_DESCRIPTION("wireless configuration support");
  40 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
  41
  42 /* RCU-protected (and RTNL for writers) */
  43 LIST_HEAD(cfg80211_rdev_list);
  44 int cfg80211_rdev_list_generation;
  45
  46 /* for debugfs */
  47 static struct dentry *ieee80211_debugfs_dir;
  48
  49 /* for the cleanup, scan and event works */
  50 struct workqueue_struct *cfg80211_wq;
  51
  52 static bool cfg80211_disable_40mhz_24ghz;
  53 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  54 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  55                  "Disable 40MHz support in the 2.4GHz band");
  56
  57 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  58 {
  59         struct cfg80211_registered_device *result = NULL, *rdev;
  60
  61         ASSERT_RTNL();
  62
  63         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  64                 if (rdev->wiphy_idx == wiphy_idx) {
  65                         result = rdev;
  66                         break;
  67                 }
  68         }
  69
  70         return result;
  71 }
  72
  73 int get_wiphy_idx(struct wiphy *wiphy)
  74 {
  75         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
  76
  77         return rdev->wiphy_idx;
  78 }
  79
  80 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  81 {
  82         struct cfg80211_registered_device *rdev;
  83
  84         ASSERT_RTNL();
  85
  86         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  87         if (!rdev)
  88                 return NULL;
  89         return &rdev->wiphy;
  90 }
  91
  92 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
  93                                    const char *newname)
  94 {
  95         struct cfg80211_registered_device *rdev2;
  96         int wiphy_idx, taken = -1, digits;
  97
  98         ASSERT_RTNL();
  99
 100         if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
 101                 return -EINVAL;
 102
 103         /* prohibit calling the thing phy%d when %d is not its number */
 104         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 105         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 106                 /* count number of places needed to print wiphy_idx */
 107                 digits = 1;
 108                 while (wiphy_idx /= 10)
 109                         digits++;
 110                 /*
 111                  * deny the name if it is phy<idx> where <idx> is printed
 112                  * without leading zeroes. taken == strlen(newname) here
 113                  */
 114                 if (taken == strlen(PHY_NAME) + digits)
 115                         return -EINVAL;
 116         }
 117
 118         /* Ensure another device does not already have this name. */
 119         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 120                 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
 121                         return -EINVAL;
 122
 123         return 0;
 124 }
 125
 126 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 127                         char *newname)
 128 {
 129         int result;
 130
 131         ASSERT_RTNL();
 132
 133         /* Ignore nop renames */
 134         if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
 135                 return 0;
 136
 137         result = cfg80211_dev_check_name(rdev, newname);
 138         if (result < 0)
 139                 return result;
 140
 141         result = device_rename(&rdev->wiphy.dev, newname);
 142         if (result)
 143                 return result;
 144
 145         if (!IS_ERR_OR_NULL(rdev->wiphy.debugfsdir))
 146                 debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 147                                rdev->wiphy.debugfsdir,
 148                                rdev->wiphy.debugfsdir->d_parent, newname);
 149
 150         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 151
 152         return 0;
 153 }
 154
 155 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 156                           struct net *net)
 157 {
 158         struct wireless_dev *wdev;
 159         int err = 0;
 160
 161         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 162                 return -EOPNOTSUPP;
 163
 164         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 165                 if (!wdev->netdev)
 166                         continue;
 167                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 168                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 169                 if (err)
 170                         break;
 171                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 172         }
 173
 174         if (err) {
 175                 /* failed -- clean up to old netns */
 176                 net = wiphy_net(&rdev->wiphy);
 177
 178                 list_for_each_entry_continue_reverse(wdev,
 179                                                      &rdev->wiphy.wdev_list,
 180                                                      list) {
 181                         if (!wdev->netdev)
 182                                 continue;
 183                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 184                         err = dev_change_net_namespace(wdev->netdev, net,
 185                                                         "wlan%d");
 186                         WARN_ON(err);
 187                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 188                 }
 189
 190                 return err;
 191         }
 192
 193         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 194                 if (!wdev->netdev)
 195                         continue;
 196                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
 197         }
 198         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 199
 200         wiphy_net_set(&rdev->wiphy, net);
 201
 202         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 203         WARN_ON(err);
 204
 205         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 206         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 207                 if (!wdev->netdev)
 208                         continue;
 209                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
 210         }
 211
 212         return 0;
 213 }
 214
 215 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 216 {
 217         struct cfg80211_registered_device *rdev = data;
 218
 219         rdev_rfkill_poll(rdev);
 220 }
 221
 222 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 223                               struct wireless_dev *wdev)
 224 {
 225         ASSERT_RTNL();
 226
 227         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 228                 return;
 229
 230         if (!wdev_running(wdev))
 231                 return;
 232
 233         rdev_stop_p2p_device(rdev, wdev);
 234         wdev->is_running = false;
 235
 236         rdev->opencount--;
 237
 238         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 239                 if (WARN_ON(!rdev->scan_req->notified &&
 240                             (!rdev->int_scan_req ||
 241                              !rdev->int_scan_req->notified)))
 242                         rdev->scan_req->info.aborted = true;
 243                 ___cfg80211_scan_done(rdev, false);
 244         }
 245 }
 246
 247 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
 248                        struct wireless_dev *wdev)
 249 {
 250         ASSERT_RTNL();
 251
 252         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
 253                 return;
 254
 255         if (!wdev_running(wdev))
 256                 return;
 257
 258         rdev_stop_nan(rdev, wdev);
 259         wdev->is_running = false;
 260
 261         rdev->opencount--;
 262 }
 263
 264 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 265 {
 266         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 267         struct wireless_dev *wdev;
 268
 269         ASSERT_RTNL();
 270
 271         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 272                 if (wdev->netdev) {
 273                         dev_close(wdev->netdev);
 274                         continue;
 275                 }
 276                 /* otherwise, check iftype */
 277                 switch (wdev->iftype) {
 278                 case NL80211_IFTYPE_P2P_DEVICE:
 279                         cfg80211_stop_p2p_device(rdev, wdev);
 280                         break;
 281                 case NL80211_IFTYPE_NAN:
 282                         cfg80211_stop_nan(rdev, wdev);
 283                         break;
 284                 default:
 285                         break;
 286                 }
 287         }
 288 }
 289 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 290
 291 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 292 {
 293         struct cfg80211_registered_device *rdev = data;
 294
 295         if (!blocked)
 296                 return 0;
 297
 298         rtnl_lock();
 299         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 300         rtnl_unlock();
 301
 302         return 0;
 303 }
 304
 305 static void cfg80211_rfkill_block_work(struct work_struct *work)
 306 {
 307         struct cfg80211_registered_device *rdev;
 308
 309         rdev = container_of(work, struct cfg80211_registered_device,
 310                             rfkill_block);
 311         cfg80211_rfkill_set_block(rdev, true);
 312 }
 313
 314 static void cfg80211_event_work(struct work_struct *work)
 315 {
 316         struct cfg80211_registered_device *rdev;
 317
 318         rdev = container_of(work, struct cfg80211_registered_device,
 319                             event_work);
 320
 321         rtnl_lock();
 322         cfg80211_process_rdev_events(rdev);
 323         rtnl_unlock();
 324 }
 325
 326 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 327 {
 328         struct wireless_dev *wdev, *tmp;
 329
 330         ASSERT_RTNL();
 331
 332         list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
 333                 if (wdev->nl_owner_dead)
 334                         rdev_del_virtual_intf(rdev, wdev);
 335         }
 336 }
 337
 338 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 339 {
 340         struct cfg80211_registered_device *rdev;
 341
 342         rdev = container_of(work, struct cfg80211_registered_device,
 343                             destroy_work);
 344
 345         rtnl_lock();
 346         cfg80211_destroy_ifaces(rdev);
 347         rtnl_unlock();
 348 }
 349
 350 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
 351 {
 352         struct cfg80211_registered_device *rdev;
 353         struct cfg80211_sched_scan_request *req, *tmp;
 354
 355         rdev = container_of(work, struct cfg80211_registered_device,
 356                            sched_scan_stop_wk);
 357
 358         rtnl_lock();
 359         list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
 360                 if (req->nl_owner_dead)
 361                         cfg80211_stop_sched_scan_req(rdev, req, false);
 362         }
 363         rtnl_unlock();
 364 }
 365
 366 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
 367 {
 368         struct cfg80211_registered_device *rdev;
 369
 370         rdev = container_of(work, struct cfg80211_registered_device,
 371                             propagate_radar_detect_wk);
 372
 373         rtnl_lock();
 374
 375         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
 376                                        NL80211_DFS_UNAVAILABLE,
 377                                        NL80211_RADAR_DETECTED);
 378
 379         rtnl_unlock();
 380 }
 381
 382 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
 383 {
 384         struct cfg80211_registered_device *rdev;
 385
 386         rdev = container_of(work, struct cfg80211_registered_device,
 387                             propagate_cac_done_wk);
 388
 389         rtnl_lock();
 390
 391         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
 392                                        NL80211_DFS_AVAILABLE,
 393                                        NL80211_RADAR_CAC_FINISHED);
 394
 395         rtnl_unlock();
 396 }
 397
 398 /* exported functions */
 399
 400 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 401                            const char *requested_name)
 402 {
 403         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 404
 405         struct cfg80211_registered_device *rdev;
 406         int alloc_size;
 407
 408         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 409         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 410         WARN_ON(ops->connect && !ops->disconnect);
 411         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 412         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 413         WARN_ON(ops->add_station && !ops->del_station);
 414         WARN_ON(ops->add_mpath && !ops->del_mpath);
 415         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 416         WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
 417         WARN_ON(ops->start_ap && !ops->stop_ap);
 418         WARN_ON(ops->join_ocb && !ops->leave_ocb);
 419         WARN_ON(ops->suspend && !ops->resume);
 420         WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
 421         WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
 422         WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
 423         WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
 424
 425         alloc_size = sizeof(*rdev) + sizeof_priv;
 426
 427         rdev = kzalloc(alloc_size, GFP_KERNEL);
 428         if (!rdev)
 429                 return NULL;
 430
 431         rdev->ops = ops;
 432
 433         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 434
 435         if (unlikely(rdev->wiphy_idx < 0)) {
 436                 /* ugh, wrapped! */
 437                 atomic_dec(&wiphy_counter);
 438                 kfree(rdev);
 439                 return NULL;
 440         }
 441
 442         /* atomic_inc_return makes it start at 1, make it start at 0 */
 443         rdev->wiphy_idx--;
 444
 445         /* give it a proper name */
 446         if (requested_name && requested_name[0]) {
 447                 int rv;
 448
 449                 rtnl_lock();
 450                 rv = cfg80211_dev_check_name(rdev, requested_name);
 451
 452                 if (rv < 0) {
 453                         rtnl_unlock();
 454                         goto use_default_name;
 455                 }
 456
 457                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 458                 rtnl_unlock();
 459                 if (rv)
 460                         goto use_default_name;
 461         } else {
 462                 int rv;
 463
 464 use_default_name:
 465                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 466                  * the restrictions on phy names.  Probably this call could
 467                  * fail if some other part of the kernel (re)named a device
 468                  * phyX.  But, might should add some locking and check return
 469                  * value, and use a different name if this one exists?
 470                  */
 471                 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 472                 if (rv < 0) {
 473                         kfree(rdev);
 474                         return NULL;
 475                 }
 476         }
 477
 478         INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
 479         INIT_LIST_HEAD(&rdev->beacon_registrations);
 480         spin_lock_init(&rdev->beacon_registrations_lock);
 481         spin_lock_init(&rdev->bss_lock);
 482         INIT_LIST_HEAD(&rdev->bss_list);
 483         INIT_LIST_HEAD(&rdev->sched_scan_req_list);
 484         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 485         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 486                           cfg80211_dfs_channels_update_work);
 487 #ifdef CONFIG_CFG80211_WEXT
 488         rdev->wiphy.wext = &cfg80211_wext_handler;
 489 #endif
 490
 491         device_initialize(&rdev->wiphy.dev);
 492         rdev->wiphy.dev.class = &ieee80211_class;
 493         rdev->wiphy.dev.platform_data = rdev;
 494         device_enable_async_suspend(&rdev->wiphy.dev);
 495
 496         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 497         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 498         INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
 499         INIT_WORK(&rdev->propagate_radar_detect_wk,
 500                   cfg80211_propagate_radar_detect_wk);
 501         INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
 502         INIT_WORK(&rdev->mgmt_registrations_update_wk,
 503                   cfg80211_mgmt_registrations_update_wk);
 504
 505 #ifdef CONFIG_CFG80211_DEFAULT_PS
 506         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 507 #endif
 508
 509         wiphy_net_set(&rdev->wiphy, &init_net);
 510
 511         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 512         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 513                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 514                                    &rdev->rfkill_ops, rdev);
 515
 516         if (!rdev->rfkill) {
 517                 wiphy_free(&rdev->wiphy);
 518                 return NULL;
 519         }
 520
 521         INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
 522         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 523         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 524
 525         init_waitqueue_head(&rdev->dev_wait);
 526
 527         /*
 528          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 529          * Fragmentation and RTS threshold are disabled by default with the
 530          * special -1 value.
 531          */
 532         rdev->wiphy.retry_short = 7;
 533         rdev->wiphy.retry_long = 4;
 534         rdev->wiphy.frag_threshold = (u32) -1;
 535         rdev->wiphy.rts_threshold = (u32) -1;
 536         rdev->wiphy.coverage_class = 0;
 537
 538         rdev->wiphy.max_num_csa_counters = 1;
 539
 540         rdev->wiphy.max_sched_scan_plans = 1;
 541         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 542
 543         return &rdev->wiphy;
 544 }
 545 EXPORT_SYMBOL(wiphy_new_nm);
 546
 547 static int wiphy_verify_combinations(struct wiphy *wiphy)
 548 {
 549         const struct ieee80211_iface_combination *c;
 550         int i, j;
 551
 552         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 553                 u32 cnt = 0;
 554                 u16 all_iftypes = 0;
 555
 556                 c = &wiphy->iface_combinations[i];
 557
 558                 /*
 559                  * Combinations with just one interface aren't real,
 560                  * however we make an exception for DFS.
 561                  */
 562                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 563                         return -EINVAL;
 564
 565                 /* Need at least one channel */
 566                 if (WARN_ON(!c->num_different_channels))
 567                         return -EINVAL;
 568
 569                 /*
 570                  * Put a sane limit on maximum number of different
 571                  * channels to simplify channel accounting code.
 572                  */
 573                 if (WARN_ON(c->num_different_channels >
 574                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 575                         return -EINVAL;
 576
 577                 /* DFS only works on one channel. */
 578                 if (WARN_ON(c->radar_detect_widths &&
 579                             (c->num_different_channels > 1)))
 580                         return -EINVAL;
 581
 582                 if (WARN_ON(!c->n_limits))
 583                         return -EINVAL;
 584
 585                 for (j = 0; j < c->n_limits; j++) {
 586                         u16 types = c->limits[j].types;
 587
 588                         /* interface types shouldn't overlap */
 589                         if (WARN_ON(types & all_iftypes))
 590                                 return -EINVAL;
 591                         all_iftypes |= types;
 592
 593                         if (WARN_ON(!c->limits[j].max))
 594                                 return -EINVAL;
 595
 596                         /* Shouldn't list software iftypes in combinations! */
 597                         if (WARN_ON(wiphy->software_iftypes & types))
 598                                 return -EINVAL;
 599
 600                         /* Only a single P2P_DEVICE can be allowed */
 601                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 602                                     c->limits[j].max > 1))
 603                                 return -EINVAL;
 604
 605                         /* Only a single NAN can be allowed */
 606                         if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
 607                                     c->limits[j].max > 1))
 608                                 return -EINVAL;
 609
 610                         /*
 611                          * This isn't well-defined right now. If you have an
 612                          * IBSS interface, then its beacon interval may change
 613                          * by joining other networks, and nothing prevents it
 614                          * from doing that.
 615                          * So technically we probably shouldn't even allow AP
 616                          * and IBSS in the same interface, but it seems that
 617                          * some drivers support that, possibly only with fixed
 618                          * beacon intervals for IBSS.
 619                          */
 620                         if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
 621                                     c->beacon_int_min_gcd)) {
 622                                 return -EINVAL;
 623                         }
 624
 625                         cnt += c->limits[j].max;
 626                         /*
 627                          * Don't advertise an unsupported type
 628                          * in a combination.
 629                          */
 630                         if (WARN_ON((wiphy->interface_modes & types) != types))
 631                                 return -EINVAL;
 632                 }
 633
 634                 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
 635                         return -EINVAL;
 636
 637                 /* You can't even choose that many! */
 638                 if (WARN_ON(cnt < c->max_interfaces))
 639                         return -EINVAL;
 640         }
 641
 642         return 0;
 643 }
 644
 645 int wiphy_register(struct wiphy *wiphy)
 646 {
 647         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 648         int res;
 649         enum nl80211_band band;
 650         struct ieee80211_supported_band *sband;
 651         bool have_band = false;
 652         int i;
 653         u16 ifmodes = wiphy->interface_modes;
 654
 655 #ifdef CONFIG_PM
 656         if (WARN_ON(wiphy->wowlan &&
 657                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 658                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 659                 return -EINVAL;
 660         if (WARN_ON(wiphy->wowlan &&
 661                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 662                     !wiphy->wowlan->tcp))
 663                 return -EINVAL;
 664 #endif
 665         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 666                     (!rdev->ops->tdls_channel_switch ||
 667                      !rdev->ops->tdls_cancel_channel_switch)))
 668                 return -EINVAL;
 669
 670         if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
 671                     (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
 672                      !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
 673                      !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
 674                 return -EINVAL;
 675
 676         if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
 677                 return -EINVAL;
 678
 679         if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
 680                 return -EINVAL;
 681
 682         if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
 683                 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
 684                             !wiphy->pmsr_capa->ftm.non_asap))
 685                         return -EINVAL;
 686                 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
 687                             !wiphy->pmsr_capa->ftm.bandwidths))
 688                         return -EINVAL;
 689                 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
 690                                 ~(BIT(NL80211_PREAMBLE_LEGACY) |
 691                                   BIT(NL80211_PREAMBLE_HT) |
 692                                   BIT(NL80211_PREAMBLE_VHT) |
 693                                   BIT(NL80211_PREAMBLE_HE) |
 694                                   BIT(NL80211_PREAMBLE_DMG))))
 695                         return -EINVAL;
 696                 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
 697                              wiphy->pmsr_capa->ftm.non_trigger_based) &&
 698                             !(wiphy->pmsr_capa->ftm.preambles &
 699                               BIT(NL80211_PREAMBLE_HE))))
 700                         return -EINVAL;
 701                 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
 702                                 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
 703                                   BIT(NL80211_CHAN_WIDTH_20) |
 704                                   BIT(NL80211_CHAN_WIDTH_40) |
 705                                   BIT(NL80211_CHAN_WIDTH_80) |
 706                                   BIT(NL80211_CHAN_WIDTH_80P80) |
 707                                   BIT(NL80211_CHAN_WIDTH_160) |
 708                                   BIT(NL80211_CHAN_WIDTH_5) |
 709                                   BIT(NL80211_CHAN_WIDTH_10))))
 710                         return -EINVAL;
 711         }
 712
 713         /*
 714          * if a wiphy has unsupported modes for regulatory channel enforcement,
 715          * opt-out of enforcement checking
 716          */
 717         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 718                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 719                                        BIT(NL80211_IFTYPE_AP) |
 720                                        BIT(NL80211_IFTYPE_P2P_GO) |
 721                                        BIT(NL80211_IFTYPE_ADHOC) |
 722                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 723                                        BIT(NL80211_IFTYPE_NAN) |
 724                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 725                                        BIT(NL80211_IFTYPE_MONITOR)))
 726                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 727
 728         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 729                     (wiphy->regulatory_flags &
 730                                         (REGULATORY_CUSTOM_REG |
 731                                          REGULATORY_STRICT_REG |
 732                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 733                                          REGULATORY_COUNTRY_IE_IGNORE))))
 734                 return -EINVAL;
 735
 736         if (WARN_ON(wiphy->coalesce &&
 737                     (!wiphy->coalesce->n_rules ||
 738                      !wiphy->coalesce->n_patterns) &&
 739                     (!wiphy->coalesce->pattern_min_len ||
 740                      wiphy->coalesce->pattern_min_len >
 741                         wiphy->coalesce->pattern_max_len)))
 742                 return -EINVAL;
 743
 744         if (WARN_ON(wiphy->ap_sme_capa &&
 745                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 746                 return -EINVAL;
 747
 748         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 749                 return -EINVAL;
 750
 751         if (WARN_ON(wiphy->addresses &&
 752                     !is_zero_ether_addr(wiphy->perm_addr) &&
 753                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 754                            ETH_ALEN)))
 755                 return -EINVAL;
 756
 757         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 758                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 759                      !rdev->ops->set_mac_acl)))
 760                 return -EINVAL;
 761
 762         /* assure only valid behaviours are flagged by driver
 763          * hence subtract 2 as bit 0 is invalid.
 764          */
 765         if (WARN_ON(wiphy->bss_select_support &&
 766                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 767                 return -EINVAL;
 768
 769         if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
 770                                             NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
 771                     (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
 772                 return -EINVAL;
 773
 774         if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
 775                     rdev->ops->update_connect_params))
 776                 return -EINVAL;
 777
 778         if (wiphy->addresses)
 779                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 780
 781         /* sanity check ifmodes */
 782         WARN_ON(!ifmodes);
 783         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 784         if (WARN_ON(ifmodes != wiphy->interface_modes))
 785                 wiphy->interface_modes = ifmodes;
 786
 787         res = wiphy_verify_combinations(wiphy);
 788         if (res)
 789                 return res;
 790
 791         /* sanity check supported bands/channels */
 792         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 793                 u16 types = 0;
 794                 bool have_he = false;
 795
 796                 sband = wiphy->bands[band];
 797                 if (!sband)
 798                         continue;
 799
 800                 sband->band = band;
 801                 if (WARN_ON(!sband->n_channels))
 802                         return -EINVAL;
 803                 /*
 804                  * on 60GHz or sub-1Ghz band, there are no legacy rates, so
 805                  * n_bitrates is 0
 806                  */
 807                 if (WARN_ON((band != NL80211_BAND_60GHZ &&
 808                              band != NL80211_BAND_S1GHZ) &&
 809                             !sband->n_bitrates))
 810                         return -EINVAL;
 811
 812                 if (WARN_ON(band == NL80211_BAND_6GHZ &&
 813                             (sband->ht_cap.ht_supported ||
 814                              sband->vht_cap.vht_supported)))
 815                         return -EINVAL;
 816
 817                 /*
 818                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 819                  * modify the sband's ht data even if the driver uses a
 820                  * global structure for that.
 821                  */
 822                 if (cfg80211_disable_40mhz_24ghz &&
 823                     band == NL80211_BAND_2GHZ &&
 824                     sband->ht_cap.ht_supported) {
 825                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 826                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 827                 }
 828
 829                 /*
 830                  * Since we use a u32 for rate bitmaps in
 831                  * ieee80211_get_response_rate, we cannot
 832                  * have more than 32 legacy rates.
 833                  */
 834                 if (WARN_ON(sband->n_bitrates > 32))
 835                         return -EINVAL;
 836
 837                 for (i = 0; i < sband->n_channels; i++) {
 838                         sband->channels[i].orig_flags =
 839                                 sband->channels[i].flags;
 840                         sband->channels[i].orig_mag = INT_MAX;
 841                         sband->channels[i].orig_mpwr =
 842                                 sband->channels[i].max_power;
 843                         sband->channels[i].band = band;
 844
 845                         if (WARN_ON(sband->channels[i].freq_offset >= 1000))
 846                                 return -EINVAL;
 847                 }
 848
 849                 for (i = 0; i < sband->n_iftype_data; i++) {
 850                         const struct ieee80211_sband_iftype_data *iftd;
 851
 852                         iftd = &sband->iftype_data[i];
 853
 854                         if (WARN_ON(!iftd->types_mask))
 855                                 return -EINVAL;
 856                         if (WARN_ON(types & iftd->types_mask))
 857                                 return -EINVAL;
 858
 859                         /* at least one piece of information must be present */
 860                         if (WARN_ON(!iftd->he_cap.has_he))
 861                                 return -EINVAL;
 862
 863                         types |= iftd->types_mask;
 864
 865                         if (i == 0)
 866                                 have_he = iftd->he_cap.has_he;
 867                         else
 868                                 have_he = have_he &&
 869                                           iftd->he_cap.has_he;
 870                 }
 871
 872                 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
 873                         return -EINVAL;
 874
 875                 have_band = true;
 876         }
 877
 878         if (!have_band) {
 879                 WARN_ON(1);
 880                 return -EINVAL;
 881         }
 882
 883         for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
 884                 /*
 885                  * Validate we have a policy (can be explicitly set to
 886                  * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
 887                  * we have at least one of doit/dumpit.
 888                  */
 889                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
 890                         return -EINVAL;
 891                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
 892                             !rdev->wiphy.vendor_commands[i].dumpit))
 893                         return -EINVAL;
 894         }
 895
 896 #ifdef CONFIG_PM
 897         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 898                     (!rdev->wiphy.wowlan->pattern_min_len ||
 899                      rdev->wiphy.wowlan->pattern_min_len >
 900                                 rdev->wiphy.wowlan->pattern_max_len)))
 901                 return -EINVAL;
 902 #endif
 903
 904         /* check and set up bitrates */
 905         ieee80211_set_bitrate_flags(wiphy);
 906
 907         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 908
 909         rtnl_lock();
 910         res = device_add(&rdev->wiphy.dev);
 911         if (res) {
 912                 rtnl_unlock();
 913                 return res;
 914         }
 915
 916         /* set up regulatory info */
 917         wiphy_regulatory_register(wiphy);
 918
 919         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 920         cfg80211_rdev_list_generation++;
 921
 922         /* add to debugfs */
 923         rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
 924                                                     ieee80211_debugfs_dir);
 925
 926         cfg80211_debugfs_rdev_add(rdev);
 927         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 928
 929         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 930                 struct regulatory_request request;
 931
 932                 request.wiphy_idx = get_wiphy_idx(wiphy);
 933                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 934                 request.alpha2[0] = '9';
 935                 request.alpha2[1] = '9';
 936
 937                 nl80211_send_reg_change_event(&request);
 938         }
 939
 940         /* Check that nobody globally advertises any capabilities they do not
 941          * advertise on all possible interface types.
 942          */
 943         if (wiphy->extended_capabilities_len &&
 944             wiphy->num_iftype_ext_capab &&
 945             wiphy->iftype_ext_capab) {
 946                 u8 supported_on_all, j;
 947                 const struct wiphy_iftype_ext_capab *capab;
 948
 949                 capab = wiphy->iftype_ext_capab;
 950                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
 951                         if (capab[0].extended_capabilities_len > j)
 952                                 supported_on_all =
 953                                         capab[0].extended_capabilities[j];
 954                         else
 955                                 supported_on_all = 0x00;
 956                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
 957                                 if (j >= capab[i].extended_capabilities_len) {
 958                                         supported_on_all = 0x00;
 959                                         break;
 960                                 }
 961                                 supported_on_all &=
 962                                         capab[i].extended_capabilities[j];
 963                         }
 964                         if (WARN_ON(wiphy->extended_capabilities[j] &
 965                                     ~supported_on_all))
 966                                 break;
 967                 }
 968         }
 969
 970         rdev->wiphy.registered = true;
 971         rtnl_unlock();
 972
 973         res = rfkill_register(rdev->rfkill);
 974         if (res) {
 975                 rfkill_destroy(rdev->rfkill);
 976                 rdev->rfkill = NULL;
 977                 wiphy_unregister(&rdev->wiphy);
 978                 return res;
 979         }
 980
 981         return 0;
 982 }
 983 EXPORT_SYMBOL(wiphy_register);
 984
 985 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 986 {
 987         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 988
 989         if (!rdev->ops->rfkill_poll)
 990                 return;
 991         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 992         rfkill_resume_polling(rdev->rfkill);
 993 }
 994 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 995
 996 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 997 {
 998         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 999
1000         rfkill_pause_polling(rdev->rfkill);
1001 }
1002 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
1003
1004 void wiphy_unregister(struct wiphy *wiphy)
1005 {
1006         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1007
1008         wait_event(rdev->dev_wait, ({
1009                 int __count;
1010                 rtnl_lock();
1011                 __count = rdev->opencount;
1012                 rtnl_unlock();
1013                 __count == 0; }));
1014
1015         if (rdev->rfkill)
1016                 rfkill_unregister(rdev->rfkill);
1017
1018         rtnl_lock();
1019         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1020         rdev->wiphy.registered = false;
1021
1022         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1023
1024         /*
1025          * First remove the hardware from everywhere, this makes
1026          * it impossible to find from userspace.
1027          */
1028         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1029         list_del_rcu(&rdev->list);
1030         synchronize_rcu();
1031
1032         /*
1033          * If this device got a regulatory hint tell core its
1034          * free to listen now to a new shiny device regulatory hint
1035          */
1036         wiphy_regulatory_deregister(wiphy);
1037
1038         cfg80211_rdev_list_generation++;
1039         device_del(&rdev->wiphy.dev);
1040
1041         rtnl_unlock();
1042
1043         flush_work(&rdev->scan_done_wk);
1044         cancel_work_sync(&rdev->conn_work);
1045         flush_work(&rdev->event_work);
1046         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1047         flush_work(&rdev->destroy_work);
1048         flush_work(&rdev->sched_scan_stop_wk);
1049         flush_work(&rdev->propagate_radar_detect_wk);
1050         flush_work(&rdev->propagate_cac_done_wk);
1051         flush_work(&rdev->mgmt_registrations_update_wk);
1052
1053 #ifdef CONFIG_PM
1054         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1055                 rdev_set_wakeup(rdev, false);
1056 #endif
1057         cfg80211_rdev_free_wowlan(rdev);
1058         cfg80211_rdev_free_coalesce(rdev);
1059 }
1060 EXPORT_SYMBOL(wiphy_unregister);
1061
1062 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1063 {
1064         struct cfg80211_internal_bss *scan, *tmp;
1065         struct cfg80211_beacon_registration *reg, *treg;
1066         rfkill_destroy(rdev->rfkill);
1067         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1068                 list_del(&reg->list);
1069                 kfree(reg);
1070         }
1071         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1072                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1073         kfree(rdev);
1074 }
1075
1076 void wiphy_free(struct wiphy *wiphy)
1077 {
1078         put_device(&wiphy->dev);
1079 }
1080 EXPORT_SYMBOL(wiphy_free);
1081
1082 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
1083 {
1084         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1085
1086         if (rfkill_set_hw_state(rdev->rfkill, blocked))
1087                 schedule_work(&rdev->rfkill_block);
1088 }
1089 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
1090
1091 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1092 {
1093         kfree(wdev->cqm_config);
1094         wdev->cqm_config = NULL;
1095 }
1096
1097 static void __cfg80211_unregister_wdev(struct wireless_dev *wdev, bool sync)
1098 {
1099         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1100
1101         ASSERT_RTNL();
1102
1103         flush_work(&wdev->pmsr_free_wk);
1104
1105         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1106
1107         list_del_rcu(&wdev->list);
1108         if (sync)
1109                 synchronize_rcu();
1110         rdev->devlist_generation++;
1111
1112         cfg80211_mlme_purge_registrations(wdev);
1113
1114         switch (wdev->iftype) {
1115         case NL80211_IFTYPE_P2P_DEVICE:
1116                 cfg80211_stop_p2p_device(rdev, wdev);
1117                 break;
1118         case NL80211_IFTYPE_NAN:
1119                 cfg80211_stop_nan(rdev, wdev);
1120                 break;
1121         default:
1122                 break;
1123         }
1124
1125 #ifdef CONFIG_CFG80211_WEXT
1126         kfree_sensitive(wdev->wext.keys);
1127         wdev->wext.keys = NULL;
1128 #endif
1129         /* only initialized if we have a netdev */
1130         if (wdev->netdev)
1131                 flush_work(&wdev->disconnect_wk);
1132
1133         cfg80211_cqm_config_free(wdev);
1134 }
1135
1136 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1137 {
1138         if (WARN_ON(wdev->netdev))
1139                 return;
1140
1141         __cfg80211_unregister_wdev(wdev, true);
1142 }
1143 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1144
1145 static const struct device_type wiphy_type = {
1146         .name   = "wlan",
1147 };
1148
1149 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1150                                enum nl80211_iftype iftype, int num)
1151 {
1152         ASSERT_RTNL();
1153
1154         rdev->num_running_ifaces += num;
1155         if (iftype == NL80211_IFTYPE_MONITOR)
1156                 rdev->num_running_monitor_ifaces += num;
1157 }
1158
1159 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1160                       struct wireless_dev *wdev)
1161 {
1162         struct net_device *dev = wdev->netdev;
1163         struct cfg80211_sched_scan_request *pos, *tmp;
1164
1165         ASSERT_RTNL();
1166         ASSERT_WDEV_LOCK(wdev);
1167
1168         cfg80211_pmsr_wdev_down(wdev);
1169
1170         switch (wdev->iftype) {
1171         case NL80211_IFTYPE_ADHOC:
1172                 __cfg80211_leave_ibss(rdev, dev, true);
1173                 break;
1174         case NL80211_IFTYPE_P2P_CLIENT:
1175         case NL80211_IFTYPE_STATION:
1176                 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1177                                          list) {
1178                         if (dev == pos->dev)
1179                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1180                 }
1181
1182 #ifdef CONFIG_CFG80211_WEXT
1183                 kfree(wdev->wext.ie);
1184                 wdev->wext.ie = NULL;
1185                 wdev->wext.ie_len = 0;
1186                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1187 #endif
1188                 cfg80211_disconnect(rdev, dev,
1189                                     WLAN_REASON_DEAUTH_LEAVING, true);
1190                 break;
1191         case NL80211_IFTYPE_MESH_POINT:
1192                 __cfg80211_leave_mesh(rdev, dev);
1193                 break;
1194         case NL80211_IFTYPE_AP:
1195         case NL80211_IFTYPE_P2P_GO:
1196                 __cfg80211_stop_ap(rdev, dev, true);
1197                 break;
1198         case NL80211_IFTYPE_OCB:
1199                 __cfg80211_leave_ocb(rdev, dev);
1200                 break;
1201         case NL80211_IFTYPE_P2P_DEVICE:
1202         case NL80211_IFTYPE_NAN:
1203                 /* cannot happen, has no netdev */
1204                 break;
1205         case NL80211_IFTYPE_AP_VLAN:
1206         case NL80211_IFTYPE_MONITOR:
1207                 /* nothing to do */
1208                 break;
1209         case NL80211_IFTYPE_UNSPECIFIED:
1210         case NL80211_IFTYPE_WDS:
1211         case NUM_NL80211_IFTYPES:
1212                 /* invalid */
1213                 break;
1214         }
1215 }
1216
1217 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1218                     struct wireless_dev *wdev)
1219 {
1220         wdev_lock(wdev);
1221         __cfg80211_leave(rdev, wdev);
1222         wdev_unlock(wdev);
1223 }
1224
1225 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1226                          gfp_t gfp)
1227 {
1228         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1229         struct cfg80211_event *ev;
1230         unsigned long flags;
1231
1232         trace_cfg80211_stop_iface(wiphy, wdev);
1233
1234         ev = kzalloc(sizeof(*ev), gfp);
1235         if (!ev)
1236                 return;
1237
1238         ev->type = EVENT_STOPPED;
1239
1240         spin_lock_irqsave(&wdev->event_lock, flags);
1241         list_add_tail(&ev->list, &wdev->event_list);
1242         spin_unlock_irqrestore(&wdev->event_lock, flags);
1243         queue_work(cfg80211_wq, &rdev->event_work);
1244 }
1245 EXPORT_SYMBOL(cfg80211_stop_iface);
1246
1247 void cfg80211_init_wdev(struct wireless_dev *wdev)
1248 {
1249         mutex_init(&wdev->mtx);
1250         INIT_LIST_HEAD(&wdev->event_list);
1251         spin_lock_init(&wdev->event_lock);
1252         INIT_LIST_HEAD(&wdev->mgmt_registrations);
1253         spin_lock_init(&wdev->mgmt_registrations_lock);
1254         INIT_LIST_HEAD(&wdev->pmsr_list);
1255         spin_lock_init(&wdev->pmsr_lock);
1256         INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1257
1258 #ifdef CONFIG_CFG80211_WEXT
1259         wdev->wext.default_key = -1;
1260         wdev->wext.default_mgmt_key = -1;
1261         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1262 #endif
1263
1264         if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1265                 wdev->ps = true;
1266         else
1267                 wdev->ps = false;
1268         /* allow mac80211 to determine the timeout */
1269         wdev->ps_timeout = -1;
1270
1271         if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1272              wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1273              wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1274                 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1275
1276         INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1277 }
1278
1279 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1280                             struct wireless_dev *wdev)
1281 {
1282         /*
1283          * We get here also when the interface changes network namespaces,
1284          * as it's registered into the new one, but we don't want it to
1285          * change ID in that case. Checking if the ID is already assigned
1286          * works, because 0 isn't considered a valid ID and the memory is
1287          * 0-initialized.
1288          */
1289         if (!wdev->identifier)
1290                 wdev->identifier = ++rdev->wdev_id;
1291         list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1292         rdev->devlist_generation++;
1293
1294         nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1295 }
1296
1297 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1298                                          unsigned long state, void *ptr)
1299 {
1300         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1301         struct wireless_dev *wdev = dev->ieee80211_ptr;
1302         struct cfg80211_registered_device *rdev;
1303         struct cfg80211_sched_scan_request *pos, *tmp;
1304
1305         if (!wdev)
1306                 return NOTIFY_DONE;
1307
1308         rdev = wiphy_to_rdev(wdev->wiphy);
1309
1310         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1311
1312         switch (state) {
1313         case NETDEV_POST_INIT:
1314                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1315                 wdev->netdev = dev;
1316                 /* can only change netns with wiphy */
1317                 dev->features |= NETIF_F_NETNS_LOCAL;
1318
1319                 cfg80211_init_wdev(wdev);
1320                 break;
1321         case NETDEV_REGISTER:
1322                 /*
1323                  * NB: cannot take rdev->mtx here because this may be
1324                  * called within code protected by it when interfaces
1325                  * are added with nl80211.
1326                  */
1327                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1328                                       "phy80211")) {
1329                         pr_err("failed to add phy80211 symlink to netdev!\n");
1330                 }
1331
1332                 cfg80211_register_wdev(rdev, wdev);
1333                 break;
1334         case NETDEV_GOING_DOWN:
1335                 cfg80211_leave(rdev, wdev);
1336                 break;
1337         case NETDEV_DOWN:
1338                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1339                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1340                         if (WARN_ON(!rdev->scan_req->notified &&
1341                                     (!rdev->int_scan_req ||
1342                                      !rdev->int_scan_req->notified)))
1343                                 rdev->scan_req->info.aborted = true;
1344                         ___cfg80211_scan_done(rdev, false);
1345                 }
1346
1347                 list_for_each_entry_safe(pos, tmp,
1348                                          &rdev->sched_scan_req_list, list) {
1349                         if (WARN_ON(pos->dev == wdev->netdev))
1350                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1351                 }
1352
1353                 rdev->opencount--;
1354                 wake_up(&rdev->dev_wait);
1355                 break;
1356         case NETDEV_UP:
1357                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1358                 wdev_lock(wdev);
1359                 switch (wdev->iftype) {
1360 #ifdef CONFIG_CFG80211_WEXT
1361                 case NL80211_IFTYPE_ADHOC:
1362                         cfg80211_ibss_wext_join(rdev, wdev);
1363                         break;
1364                 case NL80211_IFTYPE_STATION:
1365                         cfg80211_mgd_wext_connect(rdev, wdev);
1366                         break;
1367 #endif
1368 #ifdef CONFIG_MAC80211_MESH
1369                 case NL80211_IFTYPE_MESH_POINT:
1370                         {
1371                                 /* backward compat code... */
1372                                 struct mesh_setup setup;
1373                                 memcpy(&setup, &default_mesh_setup,
1374                                                 sizeof(setup));
1375                                  /* back compat only needed for mesh_id */
1376                                 setup.mesh_id = wdev->ssid;
1377                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1378                                 if (wdev->mesh_id_up_len)
1379                                         __cfg80211_join_mesh(rdev, dev,
1380                                                         &setup,
1381                                                         &default_mesh_config);
1382                                 break;
1383                         }
1384 #endif
1385                 default:
1386                         break;
1387                 }
1388                 wdev_unlock(wdev);
1389                 rdev->opencount++;
1390
1391                 /*
1392                  * Configure power management to the driver here so that its
1393                  * correctly set also after interface type changes etc.
1394                  */
1395                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1396                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1397                     rdev->ops->set_power_mgmt &&
1398                     rdev_set_power_mgmt(rdev, dev, wdev->ps,
1399                                         wdev->ps_timeout)) {
1400                         /* assume this means it's off */
1401                         wdev->ps = false;
1402                 }
1403                 break;
1404         case NETDEV_UNREGISTER:
1405                 /*
1406                  * It is possible to get NETDEV_UNREGISTER
1407                  * multiple times. To detect that, check
1408                  * that the interface is still on the list
1409                  * of registered interfaces, and only then
1410                  * remove and clean it up.
1411                  */
1412                 if (!list_empty(&wdev->list)) {
1413                         __cfg80211_unregister_wdev(wdev, false);
1414                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1415                 }
1416                 /*
1417                  * synchronise (so that we won't find this netdev
1418                  * from other code any more) and then clear the list
1419                  * head so that the above code can safely check for
1420                  * !list_empty() to avoid double-cleanup.
1421                  */
1422                 synchronize_rcu();
1423                 INIT_LIST_HEAD(&wdev->list);
1424                 /*
1425                  * Ensure that all events have been processed and
1426                  * freed.
1427                  */
1428                 cfg80211_process_wdev_events(wdev);
1429
1430                 if (WARN_ON(wdev->current_bss)) {
1431                         cfg80211_unhold_bss(wdev->current_bss);
1432                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1433                         wdev->current_bss = NULL;
1434                 }
1435                 break;
1436         case NETDEV_PRE_UP:
1437                 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1438                                              wdev->use_4addr, 0))
1439                         return notifier_from_errno(-EOPNOTSUPP);
1440
1441                 if (rfkill_blocked(rdev->rfkill))
1442                         return notifier_from_errno(-ERFKILL);
1443                 break;
1444         default:
1445                 return NOTIFY_DONE;
1446         }
1447
1448         wireless_nlevent_flush();
1449
1450         return NOTIFY_OK;
1451 }
1452
1453 static struct notifier_block cfg80211_netdev_notifier = {
1454         .notifier_call = cfg80211_netdev_notifier_call,
1455 };
1456
1457 static void __net_exit cfg80211_pernet_exit(struct net *net)
1458 {
1459         struct cfg80211_registered_device *rdev;
1460
1461         rtnl_lock();
1462         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1463                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1464                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1465         }
1466         rtnl_unlock();
1467 }
1468
1469 static struct pernet_operations cfg80211_pernet_ops = {
1470         .exit = cfg80211_pernet_exit,
1471 };
1472
1473 static int __init cfg80211_init(void)
1474 {
1475         int err;
1476
1477         err = register_pernet_device(&cfg80211_pernet_ops);
1478         if (err)
1479                 goto out_fail_pernet;
1480
1481         err = wiphy_sysfs_init();
1482         if (err)
1483                 goto out_fail_sysfs;
1484
1485         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1486         if (err)
1487                 goto out_fail_notifier;
1488
1489         err = nl80211_init();
1490         if (err)
1491                 goto out_fail_nl80211;
1492
1493         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1494
1495         err = regulatory_init();
1496         if (err)
1497                 goto out_fail_reg;
1498
1499         cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1500         if (!cfg80211_wq) {
1501                 err = -ENOMEM;
1502                 goto out_fail_wq;
1503         }
1504
1505         return 0;
1506
1507 out_fail_wq:
1508         regulatory_exit();
1509 out_fail_reg:
1510         debugfs_remove(ieee80211_debugfs_dir);
1511         nl80211_exit();
1512 out_fail_nl80211:
1513         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1514 out_fail_notifier:
1515         wiphy_sysfs_exit();
1516 out_fail_sysfs:
1517         unregister_pernet_device(&cfg80211_pernet_ops);
1518 out_fail_pernet:
1519         return err;
1520 }
1521 fs_initcall(cfg80211_init);
1522
1523 static void __exit cfg80211_exit(void)
1524 {
1525         debugfs_remove(ieee80211_debugfs_dir);
1526         nl80211_exit();
1527         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1528         wiphy_sysfs_exit();
1529         regulatory_exit();
1530         unregister_pernet_device(&cfg80211_pernet_ops);
1531         destroy_workqueue(cfg80211_wq);
1532 }
1533 module_exit(cfg80211_exit);