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) 2018-2021 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         spin_lock_init(&rdev->mgmt_registrations_lock);
 505
 506 #ifdef CONFIG_CFG80211_DEFAULT_PS
 507         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 508 #endif
 509
 510         wiphy_net_set(&rdev->wiphy, &init_net);
 511
 512         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 513         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 514                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 515                                    &rdev->rfkill_ops, rdev);
 516
 517         if (!rdev->rfkill) {
 518                 wiphy_free(&rdev->wiphy);
 519                 return NULL;
 520         }
 521
 522         INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
 523         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 524         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 525
 526         init_waitqueue_head(&rdev->dev_wait);
 527
 528         /*
 529          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 530          * Fragmentation and RTS threshold are disabled by default with the
 531          * special -1 value.
 532          */
 533         rdev->wiphy.retry_short = 7;
 534         rdev->wiphy.retry_long = 4;
 535         rdev->wiphy.frag_threshold = (u32) -1;
 536         rdev->wiphy.rts_threshold = (u32) -1;
 537         rdev->wiphy.coverage_class = 0;
 538
 539         rdev->wiphy.max_num_csa_counters = 1;
 540
 541         rdev->wiphy.max_sched_scan_plans = 1;
 542         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 543
 544         return &rdev->wiphy;
 545 }
 546 EXPORT_SYMBOL(wiphy_new_nm);
 547
 548 static int wiphy_verify_combinations(struct wiphy *wiphy)
 549 {
 550         const struct ieee80211_iface_combination *c;
 551         int i, j;
 552
 553         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 554                 u32 cnt = 0;
 555                 u16 all_iftypes = 0;
 556
 557                 c = &wiphy->iface_combinations[i];
 558
 559                 /*
 560                  * Combinations with just one interface aren't real,
 561                  * however we make an exception for DFS.
 562                  */
 563                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 564                         return -EINVAL;
 565
 566                 /* Need at least one channel */
 567                 if (WARN_ON(!c->num_different_channels))
 568                         return -EINVAL;
 569
 570                 /*
 571                  * Put a sane limit on maximum number of different
 572                  * channels to simplify channel accounting code.
 573                  */
 574                 if (WARN_ON(c->num_different_channels >
 575                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 576                         return -EINVAL;
 577
 578                 /* DFS only works on one channel. */
 579                 if (WARN_ON(c->radar_detect_widths &&
 580                             (c->num_different_channels > 1)))
 581                         return -EINVAL;
 582
 583                 if (WARN_ON(!c->n_limits))
 584                         return -EINVAL;
 585
 586                 for (j = 0; j < c->n_limits; j++) {
 587                         u16 types = c->limits[j].types;
 588
 589                         /* interface types shouldn't overlap */
 590                         if (WARN_ON(types & all_iftypes))
 591                                 return -EINVAL;
 592                         all_iftypes |= types;
 593
 594                         if (WARN_ON(!c->limits[j].max))
 595                                 return -EINVAL;
 596
 597                         /* Shouldn't list software iftypes in combinations! */
 598                         if (WARN_ON(wiphy->software_iftypes & types))
 599                                 return -EINVAL;
 600
 601                         /* Only a single P2P_DEVICE can be allowed */
 602                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 603                                     c->limits[j].max > 1))
 604                                 return -EINVAL;
 605
 606                         /* Only a single NAN can be allowed */
 607                         if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
 608                                     c->limits[j].max > 1))
 609                                 return -EINVAL;
 610
 611                         /*
 612                          * This isn't well-defined right now. If you have an
 613                          * IBSS interface, then its beacon interval may change
 614                          * by joining other networks, and nothing prevents it
 615                          * from doing that.
 616                          * So technically we probably shouldn't even allow AP
 617                          * and IBSS in the same interface, but it seems that
 618                          * some drivers support that, possibly only with fixed
 619                          * beacon intervals for IBSS.
 620                          */
 621                         if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
 622                                     c->beacon_int_min_gcd)) {
 623                                 return -EINVAL;
 624                         }
 625
 626                         cnt += c->limits[j].max;
 627                         /*
 628                          * Don't advertise an unsupported type
 629                          * in a combination.
 630                          */
 631                         if (WARN_ON((wiphy->interface_modes & types) != types))
 632                                 return -EINVAL;
 633                 }
 634
 635 #ifndef CONFIG_WIRELESS_WDS
 636                 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
 637                         return -EINVAL;
 638 #endif
 639
 640                 /* You can't even choose that many! */
 641                 if (WARN_ON(cnt < c->max_interfaces))
 642                         return -EINVAL;
 643         }
 644
 645         return 0;
 646 }
 647
 648 int wiphy_register(struct wiphy *wiphy)
 649 {
 650         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 651         int res;
 652         enum nl80211_band band;
 653         struct ieee80211_supported_band *sband;
 654         bool have_band = false;
 655         int i;
 656         u16 ifmodes = wiphy->interface_modes;
 657
 658 #ifdef CONFIG_PM
 659         if (WARN_ON(wiphy->wowlan &&
 660                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 661                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 662                 return -EINVAL;
 663         if (WARN_ON(wiphy->wowlan &&
 664                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 665                     !wiphy->wowlan->tcp))
 666                 return -EINVAL;
 667 #endif
 668         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 669                     (!rdev->ops->tdls_channel_switch ||
 670                      !rdev->ops->tdls_cancel_channel_switch)))
 671                 return -EINVAL;
 672
 673         if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
 674                     (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
 675                      !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
 676                      !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
 677                 return -EINVAL;
 678
 679 #ifndef CONFIG_WIRELESS_WDS
 680         if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
 681                 return -EINVAL;
 682 #endif
 683
 684         if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
 685                 return -EINVAL;
 686
 687         if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
 688                 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
 689                             !wiphy->pmsr_capa->ftm.non_asap))
 690                         return -EINVAL;
 691                 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
 692                             !wiphy->pmsr_capa->ftm.bandwidths))
 693                         return -EINVAL;
 694                 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
 695                                 ~(BIT(NL80211_PREAMBLE_LEGACY) |
 696                                   BIT(NL80211_PREAMBLE_HT) |
 697                                   BIT(NL80211_PREAMBLE_VHT) |
 698                                   BIT(NL80211_PREAMBLE_HE) |
 699                                   BIT(NL80211_PREAMBLE_DMG))))
 700                         return -EINVAL;
 701                 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
 702                              wiphy->pmsr_capa->ftm.non_trigger_based) &&
 703                             !(wiphy->pmsr_capa->ftm.preambles &
 704                               BIT(NL80211_PREAMBLE_HE))))
 705                         return -EINVAL;
 706                 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
 707                                 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
 708                                   BIT(NL80211_CHAN_WIDTH_20) |
 709                                   BIT(NL80211_CHAN_WIDTH_40) |
 710                                   BIT(NL80211_CHAN_WIDTH_80) |
 711                                   BIT(NL80211_CHAN_WIDTH_80P80) |
 712                                   BIT(NL80211_CHAN_WIDTH_160) |
 713                                   BIT(NL80211_CHAN_WIDTH_5) |
 714                                   BIT(NL80211_CHAN_WIDTH_10))))
 715                         return -EINVAL;
 716         }
 717
 718         /*
 719          * if a wiphy has unsupported modes for regulatory channel enforcement,
 720          * opt-out of enforcement checking
 721          */
 722         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 723                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 724                                        BIT(NL80211_IFTYPE_AP) |
 725                                        BIT(NL80211_IFTYPE_P2P_GO) |
 726                                        BIT(NL80211_IFTYPE_ADHOC) |
 727                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 728                                        BIT(NL80211_IFTYPE_NAN) |
 729                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 730                                        BIT(NL80211_IFTYPE_MONITOR)))
 731                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 732
 733         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 734                     (wiphy->regulatory_flags &
 735                                         (REGULATORY_CUSTOM_REG |
 736                                          REGULATORY_STRICT_REG |
 737                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 738                                          REGULATORY_COUNTRY_IE_IGNORE))))
 739                 return -EINVAL;
 740
 741         if (WARN_ON(wiphy->coalesce &&
 742                     (!wiphy->coalesce->n_rules ||
 743                      !wiphy->coalesce->n_patterns) &&
 744                     (!wiphy->coalesce->pattern_min_len ||
 745                      wiphy->coalesce->pattern_min_len >
 746                         wiphy->coalesce->pattern_max_len)))
 747                 return -EINVAL;
 748
 749         if (WARN_ON(wiphy->ap_sme_capa &&
 750                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 751                 return -EINVAL;
 752
 753         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 754                 return -EINVAL;
 755
 756         if (WARN_ON(wiphy->addresses &&
 757                     !is_zero_ether_addr(wiphy->perm_addr) &&
 758                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 759                            ETH_ALEN)))
 760                 return -EINVAL;
 761
 762         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 763                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 764                      !rdev->ops->set_mac_acl)))
 765                 return -EINVAL;
 766
 767         /* assure only valid behaviours are flagged by driver
 768          * hence subtract 2 as bit 0 is invalid.
 769          */
 770         if (WARN_ON(wiphy->bss_select_support &&
 771                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 772                 return -EINVAL;
 773
 774         if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
 775                                             NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
 776                     (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
 777                 return -EINVAL;
 778
 779         if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
 780                     rdev->ops->update_connect_params))
 781                 return -EINVAL;
 782
 783         if (wiphy->addresses)
 784                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 785
 786         /* sanity check ifmodes */
 787         WARN_ON(!ifmodes);
 788         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 789         if (WARN_ON(ifmodes != wiphy->interface_modes))
 790                 wiphy->interface_modes = ifmodes;
 791
 792         res = wiphy_verify_combinations(wiphy);
 793         if (res)
 794                 return res;
 795
 796         /* sanity check supported bands/channels */
 797         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 798                 u16 types = 0;
 799                 bool have_he = false;
 800
 801                 sband = wiphy->bands[band];
 802                 if (!sband)
 803                         continue;
 804
 805                 sband->band = band;
 806                 if (WARN_ON(!sband->n_channels))
 807                         return -EINVAL;
 808                 /*
 809                  * on 60GHz or sub-1Ghz band, there are no legacy rates, so
 810                  * n_bitrates is 0
 811                  */
 812                 if (WARN_ON((band != NL80211_BAND_60GHZ &&
 813                              band != NL80211_BAND_S1GHZ) &&
 814                             !sband->n_bitrates))
 815                         return -EINVAL;
 816
 817                 if (WARN_ON(band == NL80211_BAND_6GHZ &&
 818                             (sband->ht_cap.ht_supported ||
 819                              sband->vht_cap.vht_supported)))
 820                         return -EINVAL;
 821
 822                 /*
 823                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 824                  * modify the sband's ht data even if the driver uses a
 825                  * global structure for that.
 826                  */
 827                 if (cfg80211_disable_40mhz_24ghz &&
 828                     band == NL80211_BAND_2GHZ &&
 829                     sband->ht_cap.ht_supported) {
 830                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 831                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 832                 }
 833
 834                 /*
 835                  * Since we use a u32 for rate bitmaps in
 836                  * ieee80211_get_response_rate, we cannot
 837                  * have more than 32 legacy rates.
 838                  */
 839                 if (WARN_ON(sband->n_bitrates > 32))
 840                         return -EINVAL;
 841
 842                 for (i = 0; i < sband->n_channels; i++) {
 843                         sband->channels[i].orig_flags =
 844                                 sband->channels[i].flags;
 845                         sband->channels[i].orig_mag = INT_MAX;
 846                         sband->channels[i].orig_mpwr =
 847                                 sband->channels[i].max_power;
 848                         sband->channels[i].band = band;
 849
 850                         if (WARN_ON(sband->channels[i].freq_offset >= 1000))
 851                                 return -EINVAL;
 852                 }
 853
 854                 for (i = 0; i < sband->n_iftype_data; i++) {
 855                         const struct ieee80211_sband_iftype_data *iftd;
 856
 857                         iftd = &sband->iftype_data[i];
 858
 859                         if (WARN_ON(!iftd->types_mask))
 860                                 return -EINVAL;
 861                         if (WARN_ON(types & iftd->types_mask))
 862                                 return -EINVAL;
 863
 864                         /* at least one piece of information must be present */
 865                         if (WARN_ON(!iftd->he_cap.has_he))
 866                                 return -EINVAL;
 867
 868                         types |= iftd->types_mask;
 869
 870                         if (i == 0)
 871                                 have_he = iftd->he_cap.has_he;
 872                         else
 873                                 have_he = have_he &&
 874                                           iftd->he_cap.has_he;
 875                 }
 876
 877                 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
 878                         return -EINVAL;
 879
 880                 have_band = true;
 881         }
 882
 883         if (!have_band) {
 884                 WARN_ON(1);
 885                 return -EINVAL;
 886         }
 887
 888         for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
 889                 /*
 890                  * Validate we have a policy (can be explicitly set to
 891                  * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
 892                  * we have at least one of doit/dumpit.
 893                  */
 894                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
 895                         return -EINVAL;
 896                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
 897                             !rdev->wiphy.vendor_commands[i].dumpit))
 898                         return -EINVAL;
 899         }
 900
 901 #ifdef CONFIG_PM
 902         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 903                     (!rdev->wiphy.wowlan->pattern_min_len ||
 904                      rdev->wiphy.wowlan->pattern_min_len >
 905                                 rdev->wiphy.wowlan->pattern_max_len)))
 906                 return -EINVAL;
 907 #endif
 908
 909         /* check and set up bitrates */
 910         ieee80211_set_bitrate_flags(wiphy);
 911
 912         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 913
 914         rtnl_lock();
 915         res = device_add(&rdev->wiphy.dev);
 916         if (res) {
 917                 rtnl_unlock();
 918                 return res;
 919         }
 920
 921         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 922         cfg80211_rdev_list_generation++;
 923
 924         /* add to debugfs */
 925         rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
 926                                                     ieee80211_debugfs_dir);
 927
 928         cfg80211_debugfs_rdev_add(rdev);
 929         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 930
 931         /* set up regulatory info */
 932         wiphy_regulatory_register(wiphy);
 933
 934         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 935                 struct regulatory_request request;
 936
 937                 request.wiphy_idx = get_wiphy_idx(wiphy);
 938                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 939                 request.alpha2[0] = '9';
 940                 request.alpha2[1] = '9';
 941
 942                 nl80211_send_reg_change_event(&request);
 943         }
 944
 945         /* Check that nobody globally advertises any capabilities they do not
 946          * advertise on all possible interface types.
 947          */
 948         if (wiphy->extended_capabilities_len &&
 949             wiphy->num_iftype_ext_capab &&
 950             wiphy->iftype_ext_capab) {
 951                 u8 supported_on_all, j;
 952                 const struct wiphy_iftype_ext_capab *capab;
 953
 954                 capab = wiphy->iftype_ext_capab;
 955                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
 956                         if (capab[0].extended_capabilities_len > j)
 957                                 supported_on_all =
 958                                         capab[0].extended_capabilities[j];
 959                         else
 960                                 supported_on_all = 0x00;
 961                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
 962                                 if (j >= capab[i].extended_capabilities_len) {
 963                                         supported_on_all = 0x00;
 964                                         break;
 965                                 }
 966                                 supported_on_all &=
 967                                         capab[i].extended_capabilities[j];
 968                         }
 969                         if (WARN_ON(wiphy->extended_capabilities[j] &
 970                                     ~supported_on_all))
 971                                 break;
 972                 }
 973         }
 974
 975         rdev->wiphy.registered = true;
 976         rtnl_unlock();
 977
 978         res = rfkill_register(rdev->rfkill);
 979         if (res) {
 980                 rfkill_destroy(rdev->rfkill);
 981                 rdev->rfkill = NULL;
 982                 wiphy_unregister(&rdev->wiphy);
 983                 return res;
 984         }
 985
 986         return 0;
 987 }
 988 EXPORT_SYMBOL(wiphy_register);
 989
 990 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 991 {
 992         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 993
 994         if (!rdev->ops->rfkill_poll)
 995                 return;
 996         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 997         rfkill_resume_polling(rdev->rfkill);
 998 }
 999 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
1000
1001 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
1002 {
1003         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1004
1005         rfkill_pause_polling(rdev->rfkill);
1006 }
1007 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
1008
1009 void wiphy_unregister(struct wiphy *wiphy)
1010 {
1011         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1012
1013         wait_event(rdev->dev_wait, ({
1014                 int __count;
1015                 rtnl_lock();
1016                 __count = rdev->opencount;
1017                 rtnl_unlock();
1018                 __count == 0; }));
1019
1020         if (rdev->rfkill)
1021                 rfkill_unregister(rdev->rfkill);
1022
1023         rtnl_lock();
1024         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1025         rdev->wiphy.registered = false;
1026
1027         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1028
1029         /*
1030          * First remove the hardware from everywhere, this makes
1031          * it impossible to find from userspace.
1032          */
1033         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1034         list_del_rcu(&rdev->list);
1035         synchronize_rcu();
1036
1037         /*
1038          * If this device got a regulatory hint tell core its
1039          * free to listen now to a new shiny device regulatory hint
1040          */
1041         wiphy_regulatory_deregister(wiphy);
1042
1043         cfg80211_rdev_list_generation++;
1044         device_del(&rdev->wiphy.dev);
1045
1046         rtnl_unlock();
1047
1048         flush_work(&rdev->scan_done_wk);
1049         cancel_work_sync(&rdev->conn_work);
1050         flush_work(&rdev->event_work);
1051         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1052         flush_work(&rdev->destroy_work);
1053         flush_work(&rdev->sched_scan_stop_wk);
1054         flush_work(&rdev->propagate_radar_detect_wk);
1055         flush_work(&rdev->propagate_cac_done_wk);
1056         flush_work(&rdev->mgmt_registrations_update_wk);
1057
1058 #ifdef CONFIG_PM
1059         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1060                 rdev_set_wakeup(rdev, false);
1061 #endif
1062         cfg80211_rdev_free_wowlan(rdev);
1063         cfg80211_rdev_free_coalesce(rdev);
1064 }
1065 EXPORT_SYMBOL(wiphy_unregister);
1066
1067 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1068 {
1069         struct cfg80211_internal_bss *scan, *tmp;
1070         struct cfg80211_beacon_registration *reg, *treg;
1071         rfkill_destroy(rdev->rfkill);
1072         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1073                 list_del(&reg->list);
1074                 kfree(reg);
1075         }
1076         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1077                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1078         kfree(rdev);
1079 }
1080
1081 void wiphy_free(struct wiphy *wiphy)
1082 {
1083         put_device(&wiphy->dev);
1084 }
1085 EXPORT_SYMBOL(wiphy_free);
1086
1087 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
1088 {
1089         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1090
1091         if (rfkill_set_hw_state(rdev->rfkill, blocked))
1092                 schedule_work(&rdev->rfkill_block);
1093 }
1094 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
1095
1096 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1097 {
1098         kfree(wdev->cqm_config);
1099         wdev->cqm_config = NULL;
1100 }
1101
1102 static void __cfg80211_unregister_wdev(struct wireless_dev *wdev, bool sync)
1103 {
1104         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1105
1106         ASSERT_RTNL();
1107
1108         flush_work(&wdev->pmsr_free_wk);
1109
1110         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1111
1112         list_del_rcu(&wdev->list);
1113         if (sync)
1114                 synchronize_rcu();
1115         rdev->devlist_generation++;
1116
1117         cfg80211_mlme_purge_registrations(wdev);
1118
1119         switch (wdev->iftype) {
1120         case NL80211_IFTYPE_P2P_DEVICE:
1121                 cfg80211_stop_p2p_device(rdev, wdev);
1122                 break;
1123         case NL80211_IFTYPE_NAN:
1124                 cfg80211_stop_nan(rdev, wdev);
1125                 break;
1126         default:
1127                 break;
1128         }
1129
1130 #ifdef CONFIG_CFG80211_WEXT
1131         kfree_sensitive(wdev->wext.keys);
1132         wdev->wext.keys = NULL;
1133 #endif
1134         /* only initialized if we have a netdev */
1135         if (wdev->netdev)
1136                 flush_work(&wdev->disconnect_wk);
1137
1138         cfg80211_cqm_config_free(wdev);
1139 }
1140
1141 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1142 {
1143         if (WARN_ON(wdev->netdev))
1144                 return;
1145
1146         __cfg80211_unregister_wdev(wdev, true);
1147 }
1148 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1149
1150 static const struct device_type wiphy_type = {
1151         .name   = "wlan",
1152 };
1153
1154 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1155                                enum nl80211_iftype iftype, int num)
1156 {
1157         ASSERT_RTNL();
1158
1159         rdev->num_running_ifaces += num;
1160         if (iftype == NL80211_IFTYPE_MONITOR)
1161                 rdev->num_running_monitor_ifaces += num;
1162 }
1163
1164 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1165                       struct wireless_dev *wdev)
1166 {
1167         struct net_device *dev = wdev->netdev;
1168         struct cfg80211_sched_scan_request *pos, *tmp;
1169
1170         ASSERT_RTNL();
1171         ASSERT_WDEV_LOCK(wdev);
1172
1173         cfg80211_pmsr_wdev_down(wdev);
1174
1175         switch (wdev->iftype) {
1176         case NL80211_IFTYPE_ADHOC:
1177                 __cfg80211_leave_ibss(rdev, dev, true);
1178                 break;
1179         case NL80211_IFTYPE_P2P_CLIENT:
1180         case NL80211_IFTYPE_STATION:
1181                 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1182                                          list) {
1183                         if (dev == pos->dev)
1184                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1185                 }
1186
1187 #ifdef CONFIG_CFG80211_WEXT
1188                 kfree(wdev->wext.ie);
1189                 wdev->wext.ie = NULL;
1190                 wdev->wext.ie_len = 0;
1191                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1192 #endif
1193                 cfg80211_disconnect(rdev, dev,
1194                                     WLAN_REASON_DEAUTH_LEAVING, true);
1195                 break;
1196         case NL80211_IFTYPE_MESH_POINT:
1197                 __cfg80211_leave_mesh(rdev, dev);
1198                 break;
1199         case NL80211_IFTYPE_AP:
1200         case NL80211_IFTYPE_P2P_GO:
1201                 __cfg80211_stop_ap(rdev, dev, true);
1202                 break;
1203         case NL80211_IFTYPE_OCB:
1204                 __cfg80211_leave_ocb(rdev, dev);
1205                 break;
1206         case NL80211_IFTYPE_WDS:
1207                 /* must be handled by mac80211/driver, has no APIs */
1208                 break;
1209         case NL80211_IFTYPE_P2P_DEVICE:
1210         case NL80211_IFTYPE_NAN:
1211                 /* cannot happen, has no netdev */
1212                 break;
1213         case NL80211_IFTYPE_AP_VLAN:
1214         case NL80211_IFTYPE_MONITOR:
1215                 /* nothing to do */
1216                 break;
1217         case NL80211_IFTYPE_UNSPECIFIED:
1218         case NUM_NL80211_IFTYPES:
1219                 /* invalid */
1220                 break;
1221         }
1222 }
1223
1224 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1225                     struct wireless_dev *wdev)
1226 {
1227         wdev_lock(wdev);
1228         __cfg80211_leave(rdev, wdev);
1229         wdev_unlock(wdev);
1230 }
1231
1232 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1233                          gfp_t gfp)
1234 {
1235         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1236         struct cfg80211_event *ev;
1237         unsigned long flags;
1238
1239         trace_cfg80211_stop_iface(wiphy, wdev);
1240
1241         ev = kzalloc(sizeof(*ev), gfp);
1242         if (!ev)
1243                 return;
1244
1245         ev->type = EVENT_STOPPED;
1246
1247         spin_lock_irqsave(&wdev->event_lock, flags);
1248         list_add_tail(&ev->list, &wdev->event_list);
1249         spin_unlock_irqrestore(&wdev->event_lock, flags);
1250         queue_work(cfg80211_wq, &rdev->event_work);
1251 }
1252 EXPORT_SYMBOL(cfg80211_stop_iface);
1253
1254 void cfg80211_init_wdev(struct wireless_dev *wdev)
1255 {
1256         mutex_init(&wdev->mtx);
1257         INIT_LIST_HEAD(&wdev->event_list);
1258         spin_lock_init(&wdev->event_lock);
1259         INIT_LIST_HEAD(&wdev->mgmt_registrations);
1260         INIT_LIST_HEAD(&wdev->pmsr_list);
1261         spin_lock_init(&wdev->pmsr_lock);
1262         INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1263
1264 #ifdef CONFIG_CFG80211_WEXT
1265         wdev->wext.default_key = -1;
1266         wdev->wext.default_mgmt_key = -1;
1267         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1268 #endif
1269
1270         if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1271                 wdev->ps = true;
1272         else
1273                 wdev->ps = false;
1274         /* allow mac80211 to determine the timeout */
1275         wdev->ps_timeout = -1;
1276
1277         if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1278              wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1279              wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1280                 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1281
1282         INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1283 }
1284
1285 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1286                             struct wireless_dev *wdev)
1287 {
1288         /*
1289          * We get here also when the interface changes network namespaces,
1290          * as it's registered into the new one, but we don't want it to
1291          * change ID in that case. Checking if the ID is already assigned
1292          * works, because 0 isn't considered a valid ID and the memory is
1293          * 0-initialized.
1294          */
1295         if (!wdev->identifier)
1296                 wdev->identifier = ++rdev->wdev_id;
1297         list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1298         rdev->devlist_generation++;
1299
1300         nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1301 }
1302
1303 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1304                                          unsigned long state, void *ptr)
1305 {
1306         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1307         struct wireless_dev *wdev = dev->ieee80211_ptr;
1308         struct cfg80211_registered_device *rdev;
1309         struct cfg80211_sched_scan_request *pos, *tmp;
1310
1311         if (!wdev)
1312                 return NOTIFY_DONE;
1313
1314         rdev = wiphy_to_rdev(wdev->wiphy);
1315
1316         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1317
1318         switch (state) {
1319         case NETDEV_POST_INIT:
1320                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1321                 wdev->netdev = dev;
1322                 /* can only change netns with wiphy */
1323                 dev->features |= NETIF_F_NETNS_LOCAL;
1324
1325                 cfg80211_init_wdev(wdev);
1326                 break;
1327         case NETDEV_REGISTER:
1328                 /*
1329                  * NB: cannot take rdev->mtx here because this may be
1330                  * called within code protected by it when interfaces
1331                  * are added with nl80211.
1332                  */
1333                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1334                                       "phy80211")) {
1335                         pr_err("failed to add phy80211 symlink to netdev!\n");
1336                 }
1337
1338                 cfg80211_register_wdev(rdev, wdev);
1339                 break;
1340         case NETDEV_GOING_DOWN:
1341                 cfg80211_leave(rdev, wdev);
1342                 break;
1343         case NETDEV_DOWN:
1344                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1345                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1346                         if (WARN_ON(!rdev->scan_req->notified &&
1347                                     (!rdev->int_scan_req ||
1348                                      !rdev->int_scan_req->notified)))
1349                                 rdev->scan_req->info.aborted = true;
1350                         ___cfg80211_scan_done(rdev, false);
1351                 }
1352
1353                 list_for_each_entry_safe(pos, tmp,
1354                                          &rdev->sched_scan_req_list, list) {
1355                         if (WARN_ON(pos->dev == wdev->netdev))
1356                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1357                 }
1358
1359                 rdev->opencount--;
1360                 wake_up(&rdev->dev_wait);
1361                 break;
1362         case NETDEV_UP:
1363                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1364                 wdev_lock(wdev);
1365                 switch (wdev->iftype) {
1366 #ifdef CONFIG_CFG80211_WEXT
1367                 case NL80211_IFTYPE_ADHOC:
1368                         cfg80211_ibss_wext_join(rdev, wdev);
1369                         break;
1370                 case NL80211_IFTYPE_STATION:
1371                         cfg80211_mgd_wext_connect(rdev, wdev);
1372                         break;
1373 #endif
1374 #ifdef CONFIG_MAC80211_MESH
1375                 case NL80211_IFTYPE_MESH_POINT:
1376                         {
1377                                 /* backward compat code... */
1378                                 struct mesh_setup setup;
1379                                 memcpy(&setup, &default_mesh_setup,
1380                                                 sizeof(setup));
1381                                  /* back compat only needed for mesh_id */
1382                                 setup.mesh_id = wdev->ssid;
1383                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1384                                 if (wdev->mesh_id_up_len)
1385                                         __cfg80211_join_mesh(rdev, dev,
1386                                                         &setup,
1387                                                         &default_mesh_config);
1388                                 break;
1389                         }
1390 #endif
1391                 default:
1392                         break;
1393                 }
1394                 wdev_unlock(wdev);
1395                 rdev->opencount++;
1396
1397                 /*
1398                  * Configure power management to the driver here so that its
1399                  * correctly set also after interface type changes etc.
1400                  */
1401                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1402                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1403                     rdev->ops->set_power_mgmt &&
1404                     rdev_set_power_mgmt(rdev, dev, wdev->ps,
1405                                         wdev->ps_timeout)) {
1406                         /* assume this means it's off */
1407                         wdev->ps = false;
1408                 }
1409                 break;
1410         case NETDEV_UNREGISTER:
1411                 /*
1412                  * It is possible to get NETDEV_UNREGISTER
1413                  * multiple times. To detect that, check
1414                  * that the interface is still on the list
1415                  * of registered interfaces, and only then
1416                  * remove and clean it up.
1417                  */
1418                 if (!list_empty(&wdev->list)) {
1419                         __cfg80211_unregister_wdev(wdev, false);
1420                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1421                 }
1422                 /*
1423                  * synchronise (so that we won't find this netdev
1424                  * from other code any more) and then clear the list
1425                  * head so that the above code can safely check for
1426                  * !list_empty() to avoid double-cleanup.
1427                  */
1428                 synchronize_rcu();
1429                 INIT_LIST_HEAD(&wdev->list);
1430                 /*
1431                  * Ensure that all events have been processed and
1432                  * freed.
1433                  */
1434                 cfg80211_process_wdev_events(wdev);
1435
1436                 if (WARN_ON(wdev->current_bss)) {
1437                         cfg80211_unhold_bss(wdev->current_bss);
1438                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1439                         wdev->current_bss = NULL;
1440                 }
1441                 break;
1442         case NETDEV_PRE_UP:
1443                 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1444                                              wdev->use_4addr, 0))
1445                         return notifier_from_errno(-EOPNOTSUPP);
1446
1447                 if (rfkill_blocked(rdev->rfkill))
1448                         return notifier_from_errno(-ERFKILL);
1449                 break;
1450         default:
1451                 return NOTIFY_DONE;
1452         }
1453
1454         wireless_nlevent_flush();
1455
1456         return NOTIFY_OK;
1457 }
1458
1459 static struct notifier_block cfg80211_netdev_notifier = {
1460         .notifier_call = cfg80211_netdev_notifier_call,
1461 };
1462
1463 static void __net_exit cfg80211_pernet_exit(struct net *net)
1464 {
1465         struct cfg80211_registered_device *rdev;
1466
1467         rtnl_lock();
1468         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1469                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1470                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1471         }
1472         rtnl_unlock();
1473 }
1474
1475 static struct pernet_operations cfg80211_pernet_ops = {
1476         .exit = cfg80211_pernet_exit,
1477 };
1478
1479 static int __init cfg80211_init(void)
1480 {
1481         int err;
1482
1483         err = register_pernet_device(&cfg80211_pernet_ops);
1484         if (err)
1485                 goto out_fail_pernet;
1486
1487         err = wiphy_sysfs_init();
1488         if (err)
1489                 goto out_fail_sysfs;
1490
1491         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1492         if (err)
1493                 goto out_fail_notifier;
1494
1495         err = nl80211_init();
1496         if (err)
1497                 goto out_fail_nl80211;
1498
1499         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1500
1501         err = regulatory_init();
1502         if (err)
1503                 goto out_fail_reg;
1504
1505         cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1506         if (!cfg80211_wq) {
1507                 err = -ENOMEM;
1508                 goto out_fail_wq;
1509         }
1510
1511         return 0;
1512
1513 out_fail_wq:
1514         regulatory_exit();
1515 out_fail_reg:
1516         debugfs_remove(ieee80211_debugfs_dir);
1517         nl80211_exit();
1518 out_fail_nl80211:
1519         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1520 out_fail_notifier:
1521         wiphy_sysfs_exit();
1522 out_fail_sysfs:
1523         unregister_pernet_device(&cfg80211_pernet_ops);
1524 out_fail_pernet:
1525         return err;
1526 }
1527 fs_initcall(cfg80211_init);
1528
1529 static void __exit cfg80211_exit(void)
1530 {
1531         debugfs_remove(ieee80211_debugfs_dir);
1532         nl80211_exit();
1533         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1534         wiphy_sysfs_exit();
1535         regulatory_exit();
1536         unregister_pernet_device(&cfg80211_pernet_ops);
1537         destroy_workqueue(cfg80211_wq);
1538 }
1539 module_exit(cfg80211_exit);