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