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         lockdep_assert_held(&rdev->wiphy.mtx);
 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         lockdep_assert_held(&rdev->wiphy.mtx);
 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
 277                 /* otherwise, check iftype */
 278
 279                 wiphy_lock(wiphy);
 280
 281                 switch (wdev->iftype) {
 282                 case NL80211_IFTYPE_P2P_DEVICE:
 283                         cfg80211_stop_p2p_device(rdev, wdev);
 284                         break;
 285                 case NL80211_IFTYPE_NAN:
 286                         cfg80211_stop_nan(rdev, wdev);
 287                         break;
 288                 default:
 289                         break;
 290                 }
 291
 292                 wiphy_unlock(wiphy);
 293         }
 294 }
 295 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 296
 297 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 298 {
 299         struct cfg80211_registered_device *rdev = data;
 300
 301         if (!blocked)
 302                 return 0;
 303
 304         rtnl_lock();
 305         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 306         rtnl_unlock();
 307
 308         return 0;
 309 }
 310
 311 static void cfg80211_rfkill_block_work(struct work_struct *work)
 312 {
 313         struct cfg80211_registered_device *rdev;
 314
 315         rdev = container_of(work, struct cfg80211_registered_device,
 316                             rfkill_block);
 317         cfg80211_rfkill_set_block(rdev, true);
 318 }
 319
 320 static void cfg80211_event_work(struct work_struct *work)
 321 {
 322         struct cfg80211_registered_device *rdev;
 323
 324         rdev = container_of(work, struct cfg80211_registered_device,
 325                             event_work);
 326
 327         wiphy_lock(&rdev->wiphy);
 328         cfg80211_process_rdev_events(rdev);
 329         wiphy_unlock(&rdev->wiphy);
 330 }
 331
 332 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 333 {
 334         struct wireless_dev *wdev, *tmp;
 335         bool found = false;
 336
 337         ASSERT_RTNL();
 338
 339         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 340                 if (wdev->nl_owner_dead) {
 341                         if (wdev->netdev)
 342                                 dev_close(wdev->netdev);
 343                         found = true;
 344                 }
 345         }
 346
 347         if (!found)
 348                 return;
 349
 350         wiphy_lock(&rdev->wiphy);
 351         list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
 352                 if (wdev->nl_owner_dead) {
 353                         cfg80211_leave(rdev, wdev);
 354                         rdev_del_virtual_intf(rdev, wdev);
 355                 }
 356         }
 357         wiphy_unlock(&rdev->wiphy);
 358 }
 359
 360 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 361 {
 362         struct cfg80211_registered_device *rdev;
 363
 364         rdev = container_of(work, struct cfg80211_registered_device,
 365                             destroy_work);
 366
 367         rtnl_lock();
 368         cfg80211_destroy_ifaces(rdev);
 369         rtnl_unlock();
 370 }
 371
 372 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
 373 {
 374         struct cfg80211_registered_device *rdev;
 375         struct cfg80211_sched_scan_request *req, *tmp;
 376
 377         rdev = container_of(work, struct cfg80211_registered_device,
 378                            sched_scan_stop_wk);
 379
 380         rtnl_lock();
 381         list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
 382                 if (req->nl_owner_dead)
 383                         cfg80211_stop_sched_scan_req(rdev, req, false);
 384         }
 385         rtnl_unlock();
 386 }
 387
 388 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
 389 {
 390         struct cfg80211_registered_device *rdev;
 391
 392         rdev = container_of(work, struct cfg80211_registered_device,
 393                             propagate_radar_detect_wk);
 394
 395         rtnl_lock();
 396
 397         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
 398                                        NL80211_DFS_UNAVAILABLE,
 399                                        NL80211_RADAR_DETECTED);
 400
 401         rtnl_unlock();
 402 }
 403
 404 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
 405 {
 406         struct cfg80211_registered_device *rdev;
 407
 408         rdev = container_of(work, struct cfg80211_registered_device,
 409                             propagate_cac_done_wk);
 410
 411         rtnl_lock();
 412
 413         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
 414                                        NL80211_DFS_AVAILABLE,
 415                                        NL80211_RADAR_CAC_FINISHED);
 416
 417         rtnl_unlock();
 418 }
 419
 420 /* exported functions */
 421
 422 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 423                            const char *requested_name)
 424 {
 425         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 426
 427         struct cfg80211_registered_device *rdev;
 428         int alloc_size;
 429
 430         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 431         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 432         WARN_ON(ops->connect && !ops->disconnect);
 433         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 434         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 435         WARN_ON(ops->add_station && !ops->del_station);
 436         WARN_ON(ops->add_mpath && !ops->del_mpath);
 437         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 438         WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
 439         WARN_ON(ops->start_ap && !ops->stop_ap);
 440         WARN_ON(ops->join_ocb && !ops->leave_ocb);
 441         WARN_ON(ops->suspend && !ops->resume);
 442         WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
 443         WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
 444         WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
 445         WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
 446
 447         alloc_size = sizeof(*rdev) + sizeof_priv;
 448
 449         rdev = kzalloc(alloc_size, GFP_KERNEL);
 450         if (!rdev)
 451                 return NULL;
 452
 453         rdev->ops = ops;
 454
 455         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 456
 457         if (unlikely(rdev->wiphy_idx < 0)) {
 458                 /* ugh, wrapped! */
 459                 atomic_dec(&wiphy_counter);
 460                 kfree(rdev);
 461                 return NULL;
 462         }
 463
 464         /* atomic_inc_return makes it start at 1, make it start at 0 */
 465         rdev->wiphy_idx--;
 466
 467         /* give it a proper name */
 468         if (requested_name && requested_name[0]) {
 469                 int rv;
 470
 471                 rtnl_lock();
 472                 rv = cfg80211_dev_check_name(rdev, requested_name);
 473
 474                 if (rv < 0) {
 475                         rtnl_unlock();
 476                         goto use_default_name;
 477                 }
 478
 479                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 480                 rtnl_unlock();
 481                 if (rv)
 482                         goto use_default_name;
 483         } else {
 484                 int rv;
 485
 486 use_default_name:
 487                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 488                  * the restrictions on phy names.  Probably this call could
 489                  * fail if some other part of the kernel (re)named a device
 490                  * phyX.  But, might should add some locking and check return
 491                  * value, and use a different name if this one exists?
 492                  */
 493                 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 494                 if (rv < 0) {
 495                         kfree(rdev);
 496                         return NULL;
 497                 }
 498         }
 499
 500         mutex_init(&rdev->wiphy.mtx);
 501         INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
 502         INIT_LIST_HEAD(&rdev->beacon_registrations);
 503         spin_lock_init(&rdev->beacon_registrations_lock);
 504         spin_lock_init(&rdev->bss_lock);
 505         INIT_LIST_HEAD(&rdev->bss_list);
 506         INIT_LIST_HEAD(&rdev->sched_scan_req_list);
 507         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 508         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 509                           cfg80211_dfs_channels_update_work);
 510 #ifdef CONFIG_CFG80211_WEXT
 511         rdev->wiphy.wext = &cfg80211_wext_handler;
 512 #endif
 513
 514         device_initialize(&rdev->wiphy.dev);
 515         rdev->wiphy.dev.class = &ieee80211_class;
 516         rdev->wiphy.dev.platform_data = rdev;
 517         device_enable_async_suspend(&rdev->wiphy.dev);
 518
 519         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 520         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 521         INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
 522         INIT_WORK(&rdev->propagate_radar_detect_wk,
 523                   cfg80211_propagate_radar_detect_wk);
 524         INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
 525         INIT_WORK(&rdev->mgmt_registrations_update_wk,
 526                   cfg80211_mgmt_registrations_update_wk);
 527
 528 #ifdef CONFIG_CFG80211_DEFAULT_PS
 529         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 530 #endif
 531
 532         wiphy_net_set(&rdev->wiphy, &init_net);
 533
 534         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 535         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 536                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 537                                    &rdev->rfkill_ops, rdev);
 538
 539         if (!rdev->rfkill) {
 540                 wiphy_free(&rdev->wiphy);
 541                 return NULL;
 542         }
 543
 544         INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
 545         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 546         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 547
 548         init_waitqueue_head(&rdev->dev_wait);
 549
 550         /*
 551          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 552          * Fragmentation and RTS threshold are disabled by default with the
 553          * special -1 value.
 554          */
 555         rdev->wiphy.retry_short = 7;
 556         rdev->wiphy.retry_long = 4;
 557         rdev->wiphy.frag_threshold = (u32) -1;
 558         rdev->wiphy.rts_threshold = (u32) -1;
 559         rdev->wiphy.coverage_class = 0;
 560
 561         rdev->wiphy.max_num_csa_counters = 1;
 562
 563         rdev->wiphy.max_sched_scan_plans = 1;
 564         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 565
 566         return &rdev->wiphy;
 567 }
 568 EXPORT_SYMBOL(wiphy_new_nm);
 569
 570 static int wiphy_verify_combinations(struct wiphy *wiphy)
 571 {
 572         const struct ieee80211_iface_combination *c;
 573         int i, j;
 574
 575         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 576                 u32 cnt = 0;
 577                 u16 all_iftypes = 0;
 578
 579                 c = &wiphy->iface_combinations[i];
 580
 581                 /*
 582                  * Combinations with just one interface aren't real,
 583                  * however we make an exception for DFS.
 584                  */
 585                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 586                         return -EINVAL;
 587
 588                 /* Need at least one channel */
 589                 if (WARN_ON(!c->num_different_channels))
 590                         return -EINVAL;
 591
 592                 /*
 593                  * Put a sane limit on maximum number of different
 594                  * channels to simplify channel accounting code.
 595                  */
 596                 if (WARN_ON(c->num_different_channels >
 597                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 598                         return -EINVAL;
 599
 600                 /* DFS only works on one channel. */
 601                 if (WARN_ON(c->radar_detect_widths &&
 602                             (c->num_different_channels > 1)))
 603                         return -EINVAL;
 604
 605                 if (WARN_ON(!c->n_limits))
 606                         return -EINVAL;
 607
 608                 for (j = 0; j < c->n_limits; j++) {
 609                         u16 types = c->limits[j].types;
 610
 611                         /* interface types shouldn't overlap */
 612                         if (WARN_ON(types & all_iftypes))
 613                                 return -EINVAL;
 614                         all_iftypes |= types;
 615
 616                         if (WARN_ON(!c->limits[j].max))
 617                                 return -EINVAL;
 618
 619                         /* Shouldn't list software iftypes in combinations! */
 620                         if (WARN_ON(wiphy->software_iftypes & types))
 621                                 return -EINVAL;
 622
 623                         /* Only a single P2P_DEVICE can be allowed */
 624                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 625                                     c->limits[j].max > 1))
 626                                 return -EINVAL;
 627
 628                         /* Only a single NAN can be allowed */
 629                         if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
 630                                     c->limits[j].max > 1))
 631                                 return -EINVAL;
 632
 633                         /*
 634                          * This isn't well-defined right now. If you have an
 635                          * IBSS interface, then its beacon interval may change
 636                          * by joining other networks, and nothing prevents it
 637                          * from doing that.
 638                          * So technically we probably shouldn't even allow AP
 639                          * and IBSS in the same interface, but it seems that
 640                          * some drivers support that, possibly only with fixed
 641                          * beacon intervals for IBSS.
 642                          */
 643                         if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
 644                                     c->beacon_int_min_gcd)) {
 645                                 return -EINVAL;
 646                         }
 647
 648                         cnt += c->limits[j].max;
 649                         /*
 650                          * Don't advertise an unsupported type
 651                          * in a combination.
 652                          */
 653                         if (WARN_ON((wiphy->interface_modes & types) != types))
 654                                 return -EINVAL;
 655                 }
 656
 657                 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
 658                         return -EINVAL;
 659
 660                 /* You can't even choose that many! */
 661                 if (WARN_ON(cnt < c->max_interfaces))
 662                         return -EINVAL;
 663         }
 664
 665         return 0;
 666 }
 667
 668 int wiphy_register(struct wiphy *wiphy)
 669 {
 670         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 671         int res;
 672         enum nl80211_band band;
 673         struct ieee80211_supported_band *sband;
 674         bool have_band = false;
 675         int i;
 676         u16 ifmodes = wiphy->interface_modes;
 677
 678 #ifdef CONFIG_PM
 679         if (WARN_ON(wiphy->wowlan &&
 680                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 681                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 682                 return -EINVAL;
 683         if (WARN_ON(wiphy->wowlan &&
 684                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 685                     !wiphy->wowlan->tcp))
 686                 return -EINVAL;
 687 #endif
 688         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 689                     (!rdev->ops->tdls_channel_switch ||
 690                      !rdev->ops->tdls_cancel_channel_switch)))
 691                 return -EINVAL;
 692
 693         if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
 694                     (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
 695                      !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
 696                      !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
 697                 return -EINVAL;
 698
 699         if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
 700                 return -EINVAL;
 701
 702         if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
 703                 return -EINVAL;
 704
 705         if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
 706                 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
 707                             !wiphy->pmsr_capa->ftm.non_asap))
 708                         return -EINVAL;
 709                 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
 710                             !wiphy->pmsr_capa->ftm.bandwidths))
 711                         return -EINVAL;
 712                 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
 713                                 ~(BIT(NL80211_PREAMBLE_LEGACY) |
 714                                   BIT(NL80211_PREAMBLE_HT) |
 715                                   BIT(NL80211_PREAMBLE_VHT) |
 716                                   BIT(NL80211_PREAMBLE_HE) |
 717                                   BIT(NL80211_PREAMBLE_DMG))))
 718                         return -EINVAL;
 719                 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
 720                              wiphy->pmsr_capa->ftm.non_trigger_based) &&
 721                             !(wiphy->pmsr_capa->ftm.preambles &
 722                               BIT(NL80211_PREAMBLE_HE))))
 723                         return -EINVAL;
 724                 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
 725                                 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
 726                                   BIT(NL80211_CHAN_WIDTH_20) |
 727                                   BIT(NL80211_CHAN_WIDTH_40) |
 728                                   BIT(NL80211_CHAN_WIDTH_80) |
 729                                   BIT(NL80211_CHAN_WIDTH_80P80) |
 730                                   BIT(NL80211_CHAN_WIDTH_160) |
 731                                   BIT(NL80211_CHAN_WIDTH_5) |
 732                                   BIT(NL80211_CHAN_WIDTH_10))))
 733                         return -EINVAL;
 734         }
 735
 736         /*
 737          * if a wiphy has unsupported modes for regulatory channel enforcement,
 738          * opt-out of enforcement checking
 739          */
 740         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 741                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 742                                        BIT(NL80211_IFTYPE_AP) |
 743                                        BIT(NL80211_IFTYPE_P2P_GO) |
 744                                        BIT(NL80211_IFTYPE_ADHOC) |
 745                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 746                                        BIT(NL80211_IFTYPE_NAN) |
 747                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 748                                        BIT(NL80211_IFTYPE_MONITOR)))
 749                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 750
 751         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 752                     (wiphy->regulatory_flags &
 753                                         (REGULATORY_CUSTOM_REG |
 754                                          REGULATORY_STRICT_REG |
 755                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 756                                          REGULATORY_COUNTRY_IE_IGNORE))))
 757                 return -EINVAL;
 758
 759         if (WARN_ON(wiphy->coalesce &&
 760                     (!wiphy->coalesce->n_rules ||
 761                      !wiphy->coalesce->n_patterns) &&
 762                     (!wiphy->coalesce->pattern_min_len ||
 763                      wiphy->coalesce->pattern_min_len >
 764                         wiphy->coalesce->pattern_max_len)))
 765                 return -EINVAL;
 766
 767         if (WARN_ON(wiphy->ap_sme_capa &&
 768                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 769                 return -EINVAL;
 770
 771         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 772                 return -EINVAL;
 773
 774         if (WARN_ON(wiphy->addresses &&
 775                     !is_zero_ether_addr(wiphy->perm_addr) &&
 776                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 777                            ETH_ALEN)))
 778                 return -EINVAL;
 779
 780         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 781                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 782                      !rdev->ops->set_mac_acl)))
 783                 return -EINVAL;
 784
 785         /* assure only valid behaviours are flagged by driver
 786          * hence subtract 2 as bit 0 is invalid.
 787          */
 788         if (WARN_ON(wiphy->bss_select_support &&
 789                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 790                 return -EINVAL;
 791
 792         if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
 793                                             NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
 794                     (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
 795                 return -EINVAL;
 796
 797         if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
 798                     rdev->ops->update_connect_params))
 799                 return -EINVAL;
 800
 801         if (wiphy->addresses)
 802                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 803
 804         /* sanity check ifmodes */
 805         WARN_ON(!ifmodes);
 806         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 807         if (WARN_ON(ifmodes != wiphy->interface_modes))
 808                 wiphy->interface_modes = ifmodes;
 809
 810         res = wiphy_verify_combinations(wiphy);
 811         if (res)
 812                 return res;
 813
 814         /* sanity check supported bands/channels */
 815         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 816                 u16 types = 0;
 817                 bool have_he = false;
 818
 819                 sband = wiphy->bands[band];
 820                 if (!sband)
 821                         continue;
 822
 823                 sband->band = band;
 824                 if (WARN_ON(!sband->n_channels))
 825                         return -EINVAL;
 826                 /*
 827                  * on 60GHz or sub-1Ghz band, there are no legacy rates, so
 828                  * n_bitrates is 0
 829                  */
 830                 if (WARN_ON((band != NL80211_BAND_60GHZ &&
 831                              band != NL80211_BAND_S1GHZ) &&
 832                             !sband->n_bitrates))
 833                         return -EINVAL;
 834
 835                 if (WARN_ON(band == NL80211_BAND_6GHZ &&
 836                             (sband->ht_cap.ht_supported ||
 837                              sband->vht_cap.vht_supported)))
 838                         return -EINVAL;
 839
 840                 /*
 841                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 842                  * modify the sband's ht data even if the driver uses a
 843                  * global structure for that.
 844                  */
 845                 if (cfg80211_disable_40mhz_24ghz &&
 846                     band == NL80211_BAND_2GHZ &&
 847                     sband->ht_cap.ht_supported) {
 848                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 849                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 850                 }
 851
 852                 /*
 853                  * Since we use a u32 for rate bitmaps in
 854                  * ieee80211_get_response_rate, we cannot
 855                  * have more than 32 legacy rates.
 856                  */
 857                 if (WARN_ON(sband->n_bitrates > 32))
 858                         return -EINVAL;
 859
 860                 for (i = 0; i < sband->n_channels; i++) {
 861                         sband->channels[i].orig_flags =
 862                                 sband->channels[i].flags;
 863                         sband->channels[i].orig_mag = INT_MAX;
 864                         sband->channels[i].orig_mpwr =
 865                                 sband->channels[i].max_power;
 866                         sband->channels[i].band = band;
 867
 868                         if (WARN_ON(sband->channels[i].freq_offset >= 1000))
 869                                 return -EINVAL;
 870                 }
 871
 872                 for (i = 0; i < sband->n_iftype_data; i++) {
 873                         const struct ieee80211_sband_iftype_data *iftd;
 874
 875                         iftd = &sband->iftype_data[i];
 876
 877                         if (WARN_ON(!iftd->types_mask))
 878                                 return -EINVAL;
 879                         if (WARN_ON(types & iftd->types_mask))
 880                                 return -EINVAL;
 881
 882                         /* at least one piece of information must be present */
 883                         if (WARN_ON(!iftd->he_cap.has_he))
 884                                 return -EINVAL;
 885
 886                         types |= iftd->types_mask;
 887
 888                         if (i == 0)
 889                                 have_he = iftd->he_cap.has_he;
 890                         else
 891                                 have_he = have_he &&
 892                                           iftd->he_cap.has_he;
 893                 }
 894
 895                 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
 896                         return -EINVAL;
 897
 898                 have_band = true;
 899         }
 900
 901         if (!have_band) {
 902                 WARN_ON(1);
 903                 return -EINVAL;
 904         }
 905
 906         for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
 907                 /*
 908                  * Validate we have a policy (can be explicitly set to
 909                  * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
 910                  * we have at least one of doit/dumpit.
 911                  */
 912                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
 913                         return -EINVAL;
 914                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
 915                             !rdev->wiphy.vendor_commands[i].dumpit))
 916                         return -EINVAL;
 917         }
 918
 919 #ifdef CONFIG_PM
 920         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 921                     (!rdev->wiphy.wowlan->pattern_min_len ||
 922                      rdev->wiphy.wowlan->pattern_min_len >
 923                                 rdev->wiphy.wowlan->pattern_max_len)))
 924                 return -EINVAL;
 925 #endif
 926
 927         /* check and set up bitrates */
 928         ieee80211_set_bitrate_flags(wiphy);
 929
 930         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 931
 932         rtnl_lock();
 933         res = device_add(&rdev->wiphy.dev);
 934         if (res) {
 935                 rtnl_unlock();
 936                 return res;
 937         }
 938
 939         /* set up regulatory info */
 940         wiphy_regulatory_register(wiphy);
 941
 942         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 943         cfg80211_rdev_list_generation++;
 944
 945         /* add to debugfs */
 946         rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
 947                                                     ieee80211_debugfs_dir);
 948
 949         cfg80211_debugfs_rdev_add(rdev);
 950         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 951
 952         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 953                 struct regulatory_request request;
 954
 955                 request.wiphy_idx = get_wiphy_idx(wiphy);
 956                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 957                 request.alpha2[0] = '9';
 958                 request.alpha2[1] = '9';
 959
 960                 nl80211_send_reg_change_event(&request);
 961         }
 962
 963         /* Check that nobody globally advertises any capabilities they do not
 964          * advertise on all possible interface types.
 965          */
 966         if (wiphy->extended_capabilities_len &&
 967             wiphy->num_iftype_ext_capab &&
 968             wiphy->iftype_ext_capab) {
 969                 u8 supported_on_all, j;
 970                 const struct wiphy_iftype_ext_capab *capab;
 971
 972                 capab = wiphy->iftype_ext_capab;
 973                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
 974                         if (capab[0].extended_capabilities_len > j)
 975                                 supported_on_all =
 976                                         capab[0].extended_capabilities[j];
 977                         else
 978                                 supported_on_all = 0x00;
 979                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
 980                                 if (j >= capab[i].extended_capabilities_len) {
 981                                         supported_on_all = 0x00;
 982                                         break;
 983                                 }
 984                                 supported_on_all &=
 985                                         capab[i].extended_capabilities[j];
 986                         }
 987                         if (WARN_ON(wiphy->extended_capabilities[j] &
 988                                     ~supported_on_all))
 989                                 break;
 990                 }
 991         }
 992
 993         rdev->wiphy.registered = true;
 994         rtnl_unlock();
 995
 996         res = rfkill_register(rdev->rfkill);
 997         if (res) {
 998                 rfkill_destroy(rdev->rfkill);
 999                 rdev->rfkill = NULL;
1000                 wiphy_unregister(&rdev->wiphy);
1001                 return res;
1002         }
1003
1004         return 0;
1005 }
1006 EXPORT_SYMBOL(wiphy_register);
1007
1008 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
1009 {
1010         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1011
1012         if (!rdev->ops->rfkill_poll)
1013                 return;
1014         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
1015         rfkill_resume_polling(rdev->rfkill);
1016 }
1017 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
1018
1019 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
1020 {
1021         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1022
1023         rfkill_pause_polling(rdev->rfkill);
1024 }
1025 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
1026
1027 void wiphy_unregister(struct wiphy *wiphy)
1028 {
1029         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1030
1031         wait_event(rdev->dev_wait, ({
1032                 int __count;
1033                 wiphy_lock(&rdev->wiphy);
1034                 __count = rdev->opencount;
1035                 wiphy_unlock(&rdev->wiphy);
1036                 __count == 0; }));
1037
1038         if (rdev->rfkill)
1039                 rfkill_unregister(rdev->rfkill);
1040
1041         rtnl_lock();
1042         wiphy_lock(&rdev->wiphy);
1043         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1044         rdev->wiphy.registered = false;
1045
1046         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1047
1048         /*
1049          * First remove the hardware from everywhere, this makes
1050          * it impossible to find from userspace.
1051          */
1052         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1053         list_del_rcu(&rdev->list);
1054         synchronize_rcu();
1055
1056         /*
1057          * If this device got a regulatory hint tell core its
1058          * free to listen now to a new shiny device regulatory hint
1059          */
1060         wiphy_regulatory_deregister(wiphy);
1061
1062         cfg80211_rdev_list_generation++;
1063         device_del(&rdev->wiphy.dev);
1064
1065         wiphy_unlock(&rdev->wiphy);
1066         rtnl_unlock();
1067
1068         flush_work(&rdev->scan_done_wk);
1069         cancel_work_sync(&rdev->conn_work);
1070         flush_work(&rdev->event_work);
1071         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1072         flush_work(&rdev->destroy_work);
1073         flush_work(&rdev->sched_scan_stop_wk);
1074         flush_work(&rdev->propagate_radar_detect_wk);
1075         flush_work(&rdev->propagate_cac_done_wk);
1076         flush_work(&rdev->mgmt_registrations_update_wk);
1077
1078 #ifdef CONFIG_PM
1079         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1080                 rdev_set_wakeup(rdev, false);
1081 #endif
1082         cfg80211_rdev_free_wowlan(rdev);
1083         cfg80211_rdev_free_coalesce(rdev);
1084 }
1085 EXPORT_SYMBOL(wiphy_unregister);
1086
1087 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1088 {
1089         struct cfg80211_internal_bss *scan, *tmp;
1090         struct cfg80211_beacon_registration *reg, *treg;
1091         rfkill_destroy(rdev->rfkill);
1092         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1093                 list_del(&reg->list);
1094                 kfree(reg);
1095         }
1096         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1097                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1098         mutex_destroy(&rdev->wiphy.mtx);
1099         kfree(rdev);
1100 }
1101
1102 void wiphy_free(struct wiphy *wiphy)
1103 {
1104         put_device(&wiphy->dev);
1105 }
1106 EXPORT_SYMBOL(wiphy_free);
1107
1108 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
1109                                       enum rfkill_hard_block_reasons reason)
1110 {
1111         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1112
1113         if (rfkill_set_hw_state_reason(rdev->rfkill, blocked, reason))
1114                 schedule_work(&rdev->rfkill_block);
1115 }
1116 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);
1117
1118 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1119 {
1120         kfree(wdev->cqm_config);
1121         wdev->cqm_config = NULL;
1122 }
1123
1124 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
1125                                       bool unregister_netdev)
1126 {
1127         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1128
1129         ASSERT_RTNL();
1130         lockdep_assert_held(&rdev->wiphy.mtx);
1131
1132         flush_work(&wdev->pmsr_free_wk);
1133
1134         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1135
1136         wdev->registered = false;
1137
1138         if (wdev->netdev) {
1139                 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
1140                 if (unregister_netdev)
1141                         unregister_netdevice(wdev->netdev);
1142         }
1143
1144         list_del_rcu(&wdev->list);
1145         synchronize_net();
1146         rdev->devlist_generation++;
1147
1148         cfg80211_mlme_purge_registrations(wdev);
1149
1150         switch (wdev->iftype) {
1151         case NL80211_IFTYPE_P2P_DEVICE:
1152                 cfg80211_stop_p2p_device(rdev, wdev);
1153                 break;
1154         case NL80211_IFTYPE_NAN:
1155                 cfg80211_stop_nan(rdev, wdev);
1156                 break;
1157         default:
1158                 break;
1159         }
1160
1161 #ifdef CONFIG_CFG80211_WEXT
1162         kfree_sensitive(wdev->wext.keys);
1163         wdev->wext.keys = NULL;
1164 #endif
1165         /* only initialized if we have a netdev */
1166         if (wdev->netdev)
1167                 flush_work(&wdev->disconnect_wk);
1168
1169         cfg80211_cqm_config_free(wdev);
1170
1171         /*
1172          * Ensure that all events have been processed and
1173          * freed.
1174          */
1175         cfg80211_process_wdev_events(wdev);
1176
1177         if (WARN_ON(wdev->current_bss)) {
1178                 cfg80211_unhold_bss(wdev->current_bss);
1179                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1180                 wdev->current_bss = NULL;
1181         }
1182 }
1183
1184 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1185 {
1186         _cfg80211_unregister_wdev(wdev, true);
1187 }
1188 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1189
1190 static const struct device_type wiphy_type = {
1191         .name   = "wlan",
1192 };
1193
1194 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1195                                enum nl80211_iftype iftype, int num)
1196 {
1197         lockdep_assert_held(&rdev->wiphy.mtx);
1198
1199         rdev->num_running_ifaces += num;
1200         if (iftype == NL80211_IFTYPE_MONITOR)
1201                 rdev->num_running_monitor_ifaces += num;
1202 }
1203
1204 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1205                       struct wireless_dev *wdev)
1206 {
1207         struct net_device *dev = wdev->netdev;
1208         struct cfg80211_sched_scan_request *pos, *tmp;
1209
1210         lockdep_assert_held(&rdev->wiphy.mtx);
1211         ASSERT_WDEV_LOCK(wdev);
1212
1213         cfg80211_pmsr_wdev_down(wdev);
1214
1215         switch (wdev->iftype) {
1216         case NL80211_IFTYPE_ADHOC:
1217                 __cfg80211_leave_ibss(rdev, dev, true);
1218                 break;
1219         case NL80211_IFTYPE_P2P_CLIENT:
1220         case NL80211_IFTYPE_STATION:
1221                 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1222                                          list) {
1223                         if (dev == pos->dev)
1224                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1225                 }
1226
1227 #ifdef CONFIG_CFG80211_WEXT
1228                 kfree(wdev->wext.ie);
1229                 wdev->wext.ie = NULL;
1230                 wdev->wext.ie_len = 0;
1231                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1232 #endif
1233                 cfg80211_disconnect(rdev, dev,
1234                                     WLAN_REASON_DEAUTH_LEAVING, true);
1235                 break;
1236         case NL80211_IFTYPE_MESH_POINT:
1237                 __cfg80211_leave_mesh(rdev, dev);
1238                 break;
1239         case NL80211_IFTYPE_AP:
1240         case NL80211_IFTYPE_P2P_GO:
1241                 __cfg80211_stop_ap(rdev, dev, true);
1242                 break;
1243         case NL80211_IFTYPE_OCB:
1244                 __cfg80211_leave_ocb(rdev, dev);
1245                 break;
1246         case NL80211_IFTYPE_P2P_DEVICE:
1247         case NL80211_IFTYPE_NAN:
1248                 /* cannot happen, has no netdev */
1249                 break;
1250         case NL80211_IFTYPE_AP_VLAN:
1251         case NL80211_IFTYPE_MONITOR:
1252                 /* nothing to do */
1253                 break;
1254         case NL80211_IFTYPE_UNSPECIFIED:
1255         case NL80211_IFTYPE_WDS:
1256         case NUM_NL80211_IFTYPES:
1257                 /* invalid */
1258                 break;
1259         }
1260 }
1261
1262 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1263                     struct wireless_dev *wdev)
1264 {
1265         wdev_lock(wdev);
1266         __cfg80211_leave(rdev, wdev);
1267         wdev_unlock(wdev);
1268 }
1269
1270 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1271                          gfp_t gfp)
1272 {
1273         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1274         struct cfg80211_event *ev;
1275         unsigned long flags;
1276
1277         trace_cfg80211_stop_iface(wiphy, wdev);
1278
1279         ev = kzalloc(sizeof(*ev), gfp);
1280         if (!ev)
1281                 return;
1282
1283         ev->type = EVENT_STOPPED;
1284
1285         spin_lock_irqsave(&wdev->event_lock, flags);
1286         list_add_tail(&ev->list, &wdev->event_list);
1287         spin_unlock_irqrestore(&wdev->event_lock, flags);
1288         queue_work(cfg80211_wq, &rdev->event_work);
1289 }
1290 EXPORT_SYMBOL(cfg80211_stop_iface);
1291
1292 void cfg80211_init_wdev(struct wireless_dev *wdev)
1293 {
1294         mutex_init(&wdev->mtx);
1295         INIT_LIST_HEAD(&wdev->event_list);
1296         spin_lock_init(&wdev->event_lock);
1297         INIT_LIST_HEAD(&wdev->mgmt_registrations);
1298         spin_lock_init(&wdev->mgmt_registrations_lock);
1299         INIT_LIST_HEAD(&wdev->pmsr_list);
1300         spin_lock_init(&wdev->pmsr_lock);
1301         INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1302
1303 #ifdef CONFIG_CFG80211_WEXT
1304         wdev->wext.default_key = -1;
1305         wdev->wext.default_mgmt_key = -1;
1306         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1307 #endif
1308
1309         if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1310                 wdev->ps = true;
1311         else
1312                 wdev->ps = false;
1313         /* allow mac80211 to determine the timeout */
1314         wdev->ps_timeout = -1;
1315
1316         if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1317              wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1318              wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1319                 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1320
1321         INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1322 }
1323
1324 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1325                             struct wireless_dev *wdev)
1326 {
1327         ASSERT_RTNL();
1328         lockdep_assert_held(&rdev->wiphy.mtx);
1329
1330         /*
1331          * We get here also when the interface changes network namespaces,
1332          * as it's registered into the new one, but we don't want it to
1333          * change ID in that case. Checking if the ID is already assigned
1334          * works, because 0 isn't considered a valid ID and the memory is
1335          * 0-initialized.
1336          */
1337         if (!wdev->identifier)
1338                 wdev->identifier = ++rdev->wdev_id;
1339         list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1340         rdev->devlist_generation++;
1341         wdev->registered = true;
1342
1343         if (wdev->netdev &&
1344             sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj,
1345                               "phy80211"))
1346                 pr_err("failed to add phy80211 symlink to netdev!\n");
1347
1348         nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1349 }
1350
1351 int cfg80211_register_netdevice(struct net_device *dev)
1352 {
1353         struct wireless_dev *wdev = dev->ieee80211_ptr;
1354         struct cfg80211_registered_device *rdev;
1355         int ret;
1356
1357         ASSERT_RTNL();
1358
1359         if (WARN_ON(!wdev))
1360                 return -EINVAL;
1361
1362         rdev = wiphy_to_rdev(wdev->wiphy);
1363
1364         lockdep_assert_held(&rdev->wiphy.mtx);
1365
1366         /* we'll take care of this */
1367         wdev->registered = true;
1368         wdev->registering = true;
1369         ret = register_netdevice(dev);
1370         if (ret)
1371                 goto out;
1372
1373         cfg80211_register_wdev(rdev, wdev);
1374         ret = 0;
1375 out:
1376         wdev->registering = false;
1377         if (ret)
1378                 wdev->registered = false;
1379         return ret;
1380 }
1381 EXPORT_SYMBOL(cfg80211_register_netdevice);
1382
1383 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1384                                          unsigned long state, void *ptr)
1385 {
1386         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1387         struct wireless_dev *wdev = dev->ieee80211_ptr;
1388         struct cfg80211_registered_device *rdev;
1389         struct cfg80211_sched_scan_request *pos, *tmp;
1390
1391         if (!wdev)
1392                 return NOTIFY_DONE;
1393
1394         rdev = wiphy_to_rdev(wdev->wiphy);
1395
1396         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1397
1398         switch (state) {
1399         case NETDEV_POST_INIT:
1400                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1401                 wdev->netdev = dev;
1402                 /* can only change netns with wiphy */
1403                 dev->features |= NETIF_F_NETNS_LOCAL;
1404
1405                 cfg80211_init_wdev(wdev);
1406                 break;
1407         case NETDEV_REGISTER:
1408                 if (!wdev->registered) {
1409                         wiphy_lock(&rdev->wiphy);
1410                         cfg80211_register_wdev(rdev, wdev);
1411                         wiphy_unlock(&rdev->wiphy);
1412                 }
1413                 break;
1414         case NETDEV_UNREGISTER:
1415                 /*
1416                  * It is possible to get NETDEV_UNREGISTER multiple times,
1417                  * so check wdev->registered.
1418                  */
1419                 if (wdev->registered && !wdev->registering) {
1420                         wiphy_lock(&rdev->wiphy);
1421                         _cfg80211_unregister_wdev(wdev, false);
1422                         wiphy_unlock(&rdev->wiphy);
1423                 }
1424                 break;
1425         case NETDEV_GOING_DOWN:
1426                 wiphy_lock(&rdev->wiphy);
1427                 cfg80211_leave(rdev, wdev);
1428                 wiphy_unlock(&rdev->wiphy);
1429                 break;
1430         case NETDEV_DOWN:
1431                 wiphy_lock(&rdev->wiphy);
1432                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1433                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1434                         if (WARN_ON(!rdev->scan_req->notified &&
1435                                     (!rdev->int_scan_req ||
1436                                      !rdev->int_scan_req->notified)))
1437                                 rdev->scan_req->info.aborted = true;
1438                         ___cfg80211_scan_done(rdev, false);
1439                 }
1440
1441                 list_for_each_entry_safe(pos, tmp,
1442                                          &rdev->sched_scan_req_list, list) {
1443                         if (WARN_ON(pos->dev == wdev->netdev))
1444                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1445                 }
1446
1447                 rdev->opencount--;
1448                 wiphy_unlock(&rdev->wiphy);
1449                 wake_up(&rdev->dev_wait);
1450                 break;
1451         case NETDEV_UP:
1452                 wiphy_lock(&rdev->wiphy);
1453                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1454                 wdev_lock(wdev);
1455                 switch (wdev->iftype) {
1456 #ifdef CONFIG_CFG80211_WEXT
1457                 case NL80211_IFTYPE_ADHOC:
1458                         cfg80211_ibss_wext_join(rdev, wdev);
1459                         break;
1460                 case NL80211_IFTYPE_STATION:
1461                         cfg80211_mgd_wext_connect(rdev, wdev);
1462                         break;
1463 #endif
1464 #ifdef CONFIG_MAC80211_MESH
1465                 case NL80211_IFTYPE_MESH_POINT:
1466                         {
1467                                 /* backward compat code... */
1468                                 struct mesh_setup setup;
1469                                 memcpy(&setup, &default_mesh_setup,
1470                                                 sizeof(setup));
1471                                  /* back compat only needed for mesh_id */
1472                                 setup.mesh_id = wdev->ssid;
1473                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1474                                 if (wdev->mesh_id_up_len)
1475                                         __cfg80211_join_mesh(rdev, dev,
1476                                                         &setup,
1477                                                         &default_mesh_config);
1478                                 break;
1479                         }
1480 #endif
1481                 default:
1482                         break;
1483                 }
1484                 wdev_unlock(wdev);
1485                 rdev->opencount++;
1486
1487                 /*
1488                  * Configure power management to the driver here so that its
1489                  * correctly set also after interface type changes etc.
1490                  */
1491                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1492                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1493                     rdev->ops->set_power_mgmt &&
1494                     rdev_set_power_mgmt(rdev, dev, wdev->ps,
1495                                         wdev->ps_timeout)) {
1496                         /* assume this means it's off */
1497                         wdev->ps = false;
1498                 }
1499                 wiphy_unlock(&rdev->wiphy);
1500                 break;
1501         case NETDEV_PRE_UP:
1502                 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1503                                              wdev->use_4addr, 0))
1504                         return notifier_from_errno(-EOPNOTSUPP);
1505
1506                 if (rfkill_blocked(rdev->rfkill))
1507                         return notifier_from_errno(-ERFKILL);
1508                 break;
1509         default:
1510                 return NOTIFY_DONE;
1511         }
1512
1513         wireless_nlevent_flush();
1514
1515         return NOTIFY_OK;
1516 }
1517
1518 static struct notifier_block cfg80211_netdev_notifier = {
1519         .notifier_call = cfg80211_netdev_notifier_call,
1520 };
1521
1522 static void __net_exit cfg80211_pernet_exit(struct net *net)
1523 {
1524         struct cfg80211_registered_device *rdev;
1525
1526         rtnl_lock();
1527         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1528                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1529                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1530         }
1531         rtnl_unlock();
1532 }
1533
1534 static struct pernet_operations cfg80211_pernet_ops = {
1535         .exit = cfg80211_pernet_exit,
1536 };
1537
1538 static int __init cfg80211_init(void)
1539 {
1540         int err;
1541
1542         err = register_pernet_device(&cfg80211_pernet_ops);
1543         if (err)
1544                 goto out_fail_pernet;
1545
1546         err = wiphy_sysfs_init();
1547         if (err)
1548                 goto out_fail_sysfs;
1549
1550         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1551         if (err)
1552                 goto out_fail_notifier;
1553
1554         err = nl80211_init();
1555         if (err)
1556                 goto out_fail_nl80211;
1557
1558         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1559
1560         err = regulatory_init();
1561         if (err)
1562                 goto out_fail_reg;
1563
1564         cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1565         if (!cfg80211_wq) {
1566                 err = -ENOMEM;
1567                 goto out_fail_wq;
1568         }
1569
1570         return 0;
1571
1572 out_fail_wq:
1573         regulatory_exit();
1574 out_fail_reg:
1575         debugfs_remove(ieee80211_debugfs_dir);
1576         nl80211_exit();
1577 out_fail_nl80211:
1578         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1579 out_fail_notifier:
1580         wiphy_sysfs_exit();
1581 out_fail_sysfs:
1582         unregister_pernet_device(&cfg80211_pernet_ops);
1583 out_fail_pernet:
1584         return err;
1585 }
1586 fs_initcall(cfg80211_init);
1587
1588 static void __exit cfg80211_exit(void)
1589 {
1590         debugfs_remove(ieee80211_debugfs_dir);
1591         nl80211_exit();
1592         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1593         wiphy_sysfs_exit();
1594         regulatory_exit();
1595         unregister_pernet_device(&cfg80211_pernet_ops);
1596         destroy_workqueue(cfg80211_wq);
1597 }
1598 module_exit(cfg80211_exit);