net/wireless/core.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * This is the linux wireless configuration interface.
   4  *
   5  * Copyright 2006-2010          Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  * Copyright 2015-2017  Intel Deutschland GmbH
   8  * Copyright (C) 2018-2022 Intel Corporation
   9  */
  10
  11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  12
  13 #include <linux/if.h>
  14 #include <linux/module.h>
  15 #include <linux/err.h>
  16 #include <linux/list.h>
  17 #include <linux/slab.h>
  18 #include <linux/nl80211.h>
  19 #include <linux/debugfs.h>
  20 #include <linux/notifier.h>
  21 #include <linux/device.h>
  22 #include <linux/etherdevice.h>
  23 #include <linux/rtnetlink.h>
  24 #include <linux/sched.h>
  25 #include <net/genetlink.h>
  26 #include <net/cfg80211.h>
  27 #include "nl80211.h"
  28 #include "core.h"
  29 #include "sysfs.h"
  30 #include "debugfs.h"
  31 #include "wext-compat.h"
  32 #include "rdev-ops.h"
  33
  34 /* name for sysfs, %d is appended */
  35 #define PHY_NAME "phy"
  36
  37 MODULE_AUTHOR("Johannes Berg");
  38 MODULE_LICENSE("GPL");
  39 MODULE_DESCRIPTION("wireless configuration support");
  40 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
  41
  42 /* RCU-protected (and RTNL for writers) */
  43 LIST_HEAD(cfg80211_rdev_list);
  44 int cfg80211_rdev_list_generation;
  45
  46 /* for debugfs */
  47 static struct dentry *ieee80211_debugfs_dir;
  48
  49 /* for the cleanup, scan and event works */
  50 struct workqueue_struct *cfg80211_wq;
  51
  52 static bool cfg80211_disable_40mhz_24ghz;
  53 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  54 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  55                  "Disable 40MHz support in the 2.4GHz band");
  56
  57 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  58 {
  59         struct cfg80211_registered_device *result = NULL, *rdev;
  60
  61         ASSERT_RTNL();
  62
  63         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  64                 if (rdev->wiphy_idx == wiphy_idx) {
  65                         result = rdev;
  66                         break;
  67                 }
  68         }
  69
  70         return result;
  71 }
  72
  73 int get_wiphy_idx(struct wiphy *wiphy)
  74 {
  75         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
  76
  77         return rdev->wiphy_idx;
  78 }
  79
  80 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  81 {
  82         struct cfg80211_registered_device *rdev;
  83
  84         ASSERT_RTNL();
  85
  86         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  87         if (!rdev)
  88                 return NULL;
  89         return &rdev->wiphy;
  90 }
  91
  92 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
  93                                    const char *newname)
  94 {
  95         struct cfg80211_registered_device *rdev2;
  96         int wiphy_idx, taken = -1, digits;
  97
  98         ASSERT_RTNL();
  99
 100         if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
 101                 return -EINVAL;
 102
 103         /* prohibit calling the thing phy%d when %d is not its number */
 104         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 105         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 106                 /* count number of places needed to print wiphy_idx */
 107                 digits = 1;
 108                 while (wiphy_idx /= 10)
 109                         digits++;
 110                 /*
 111                  * deny the name if it is phy<idx> where <idx> is printed
 112                  * without leading zeroes. taken == strlen(newname) here
 113                  */
 114                 if (taken == strlen(PHY_NAME) + digits)
 115                         return -EINVAL;
 116         }
 117
 118         /* Ensure another device does not already have this name. */
 119         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 120                 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
 121                         return -EINVAL;
 122
 123         return 0;
 124 }
 125
 126 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 127                         char *newname)
 128 {
 129         int result;
 130
 131         ASSERT_RTNL();
 132
 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
 338         list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
 339                 if (wdev->nl_owner_dead) {
 340                         if (wdev->netdev)
 341                                 dev_close(wdev->netdev);
 342
 343                         wiphy_lock(&rdev->wiphy);
 344                         cfg80211_leave(rdev, wdev);
 345                         rdev_del_virtual_intf(rdev, wdev);
 346                         wiphy_unlock(&rdev->wiphy);
 347                 }
 348         }
 349 }
 350
 351 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 352 {
 353         struct cfg80211_registered_device *rdev;
 354
 355         rdev = container_of(work, struct cfg80211_registered_device,
 356                             destroy_work);
 357
 358         rtnl_lock();
 359         cfg80211_destroy_ifaces(rdev);
 360         rtnl_unlock();
 361 }
 362
 363 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
 364 {
 365         struct cfg80211_registered_device *rdev;
 366         struct cfg80211_sched_scan_request *req, *tmp;
 367
 368         rdev = container_of(work, struct cfg80211_registered_device,
 369                            sched_scan_stop_wk);
 370
 371         rtnl_lock();
 372         list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
 373                 if (req->nl_owner_dead)
 374                         cfg80211_stop_sched_scan_req(rdev, req, false);
 375         }
 376         rtnl_unlock();
 377 }
 378
 379 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
 380 {
 381         struct cfg80211_registered_device *rdev;
 382
 383         rdev = container_of(work, struct cfg80211_registered_device,
 384                             propagate_radar_detect_wk);
 385
 386         rtnl_lock();
 387
 388         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
 389                                        NL80211_DFS_UNAVAILABLE,
 390                                        NL80211_RADAR_DETECTED);
 391
 392         rtnl_unlock();
 393 }
 394
 395 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
 396 {
 397         struct cfg80211_registered_device *rdev;
 398
 399         rdev = container_of(work, struct cfg80211_registered_device,
 400                             propagate_cac_done_wk);
 401
 402         rtnl_lock();
 403
 404         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
 405                                        NL80211_DFS_AVAILABLE,
 406                                        NL80211_RADAR_CAC_FINISHED);
 407
 408         rtnl_unlock();
 409 }
 410
 411 /* exported functions */
 412
 413 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 414                            const char *requested_name)
 415 {
 416         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 417
 418         struct cfg80211_registered_device *rdev;
 419         int alloc_size;
 420
 421         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 422         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 423         WARN_ON(ops->connect && !ops->disconnect);
 424         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 425         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 426         WARN_ON(ops->add_station && !ops->del_station);
 427         WARN_ON(ops->add_mpath && !ops->del_mpath);
 428         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 429         WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
 430         WARN_ON(ops->start_ap && !ops->stop_ap);
 431         WARN_ON(ops->join_ocb && !ops->leave_ocb);
 432         WARN_ON(ops->suspend && !ops->resume);
 433         WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
 434         WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
 435         WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
 436         WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
 437
 438         alloc_size = sizeof(*rdev) + sizeof_priv;
 439
 440         rdev = kzalloc(alloc_size, GFP_KERNEL);
 441         if (!rdev)
 442                 return NULL;
 443
 444         rdev->ops = ops;
 445
 446         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 447
 448         if (unlikely(rdev->wiphy_idx < 0)) {
 449                 /* ugh, wrapped! */
 450                 atomic_dec(&wiphy_counter);
 451                 kfree(rdev);
 452                 return NULL;
 453         }
 454
 455         /* atomic_inc_return makes it start at 1, make it start at 0 */
 456         rdev->wiphy_idx--;
 457
 458         /* give it a proper name */
 459         if (requested_name && requested_name[0]) {
 460                 int rv;
 461
 462                 rtnl_lock();
 463                 rv = cfg80211_dev_check_name(rdev, requested_name);
 464
 465                 if (rv < 0) {
 466                         rtnl_unlock();
 467                         goto use_default_name;
 468                 }
 469
 470                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 471                 rtnl_unlock();
 472                 if (rv)
 473                         goto use_default_name;
 474         } else {
 475                 int rv;
 476
 477 use_default_name:
 478                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 479                  * the restrictions on phy names.  Probably this call could
 480                  * fail if some other part of the kernel (re)named a device
 481                  * phyX.  But, might should add some locking and check return
 482                  * value, and use a different name if this one exists?
 483                  */
 484                 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 485                 if (rv < 0) {
 486                         kfree(rdev);
 487                         return NULL;
 488                 }
 489         }
 490
 491         mutex_init(&rdev->wiphy.mtx);
 492         INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
 493         INIT_LIST_HEAD(&rdev->beacon_registrations);
 494         spin_lock_init(&rdev->beacon_registrations_lock);
 495         spin_lock_init(&rdev->bss_lock);
 496         INIT_LIST_HEAD(&rdev->bss_list);
 497         INIT_LIST_HEAD(&rdev->sched_scan_req_list);
 498         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 499         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 500                           cfg80211_dfs_channels_update_work);
 501 #ifdef CONFIG_CFG80211_WEXT
 502         rdev->wiphy.wext = &cfg80211_wext_handler;
 503 #endif
 504
 505         device_initialize(&rdev->wiphy.dev);
 506         rdev->wiphy.dev.class = &ieee80211_class;
 507         rdev->wiphy.dev.platform_data = rdev;
 508         device_enable_async_suspend(&rdev->wiphy.dev);
 509
 510         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 511         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 512         INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
 513         INIT_WORK(&rdev->propagate_radar_detect_wk,
 514                   cfg80211_propagate_radar_detect_wk);
 515         INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
 516         INIT_WORK(&rdev->mgmt_registrations_update_wk,
 517                   cfg80211_mgmt_registrations_update_wk);
 518         spin_lock_init(&rdev->mgmt_registrations_lock);
 519
 520 #ifdef CONFIG_CFG80211_DEFAULT_PS
 521         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 522 #endif
 523
 524         wiphy_net_set(&rdev->wiphy, &init_net);
 525
 526         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 527         rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 528                                           &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 529                                           &rdev->rfkill_ops, rdev);
 530
 531         if (!rdev->wiphy.rfkill) {
 532                 wiphy_free(&rdev->wiphy);
 533                 return NULL;
 534         }
 535
 536         INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
 537         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 538         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 539         INIT_WORK(&rdev->background_cac_abort_wk,
 540                   cfg80211_background_cac_abort_wk);
 541         INIT_DELAYED_WORK(&rdev->background_cac_done_wk,
 542                           cfg80211_background_cac_done_wk);
 543
 544         init_waitqueue_head(&rdev->dev_wait);
 545
 546         /*
 547          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 548          * Fragmentation and RTS threshold are disabled by default with the
 549          * special -1 value.
 550          */
 551         rdev->wiphy.retry_short = 7;
 552         rdev->wiphy.retry_long = 4;
 553         rdev->wiphy.frag_threshold = (u32) -1;
 554         rdev->wiphy.rts_threshold = (u32) -1;
 555         rdev->wiphy.coverage_class = 0;
 556
 557         rdev->wiphy.max_num_csa_counters = 1;
 558
 559         rdev->wiphy.max_sched_scan_plans = 1;
 560         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 561
 562         return &rdev->wiphy;
 563 }
 564 EXPORT_SYMBOL(wiphy_new_nm);
 565
 566 static int wiphy_verify_combinations(struct wiphy *wiphy)
 567 {
 568         const struct ieee80211_iface_combination *c;
 569         int i, j;
 570
 571         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 572                 u32 cnt = 0;
 573                 u16 all_iftypes = 0;
 574
 575                 c = &wiphy->iface_combinations[i];
 576
 577                 /*
 578                  * Combinations with just one interface aren't real,
 579                  * however we make an exception for DFS.
 580                  */
 581                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 582                         return -EINVAL;
 583
 584                 /* Need at least one channel */
 585                 if (WARN_ON(!c->num_different_channels))
 586                         return -EINVAL;
 587
 588                 /* DFS only works on one channel. */
 589                 if (WARN_ON(c->radar_detect_widths &&
 590                             (c->num_different_channels > 1)))
 591                         return -EINVAL;
 592
 593                 if (WARN_ON(!c->n_limits))
 594                         return -EINVAL;
 595
 596                 for (j = 0; j < c->n_limits; j++) {
 597                         u16 types = c->limits[j].types;
 598
 599                         /* interface types shouldn't overlap */
 600                         if (WARN_ON(types & all_iftypes))
 601                                 return -EINVAL;
 602                         all_iftypes |= types;
 603
 604                         if (WARN_ON(!c->limits[j].max))
 605                                 return -EINVAL;
 606
 607                         /* Shouldn't list software iftypes in combinations! */
 608                         if (WARN_ON(wiphy->software_iftypes & types))
 609                                 return -EINVAL;
 610
 611                         /* Only a single P2P_DEVICE can be allowed */
 612                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 613                                     c->limits[j].max > 1))
 614                                 return -EINVAL;
 615
 616                         /* Only a single NAN can be allowed */
 617                         if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
 618                                     c->limits[j].max > 1))
 619                                 return -EINVAL;
 620
 621                         /*
 622                          * This isn't well-defined right now. If you have an
 623                          * IBSS interface, then its beacon interval may change
 624                          * by joining other networks, and nothing prevents it
 625                          * from doing that.
 626                          * So technically we probably shouldn't even allow AP
 627                          * and IBSS in the same interface, but it seems that
 628                          * some drivers support that, possibly only with fixed
 629                          * beacon intervals for IBSS.
 630                          */
 631                         if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
 632                                     c->beacon_int_min_gcd)) {
 633                                 return -EINVAL;
 634                         }
 635
 636                         cnt += c->limits[j].max;
 637                         /*
 638                          * Don't advertise an unsupported type
 639                          * in a combination.
 640                          */
 641                         if (WARN_ON((wiphy->interface_modes & types) != types))
 642                                 return -EINVAL;
 643                 }
 644
 645                 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
 646                         return -EINVAL;
 647
 648                 /* You can't even choose that many! */
 649                 if (WARN_ON(cnt < c->max_interfaces))
 650                         return -EINVAL;
 651         }
 652
 653         return 0;
 654 }
 655
 656 int wiphy_register(struct wiphy *wiphy)
 657 {
 658         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 659         int res;
 660         enum nl80211_band band;
 661         struct ieee80211_supported_band *sband;
 662         bool have_band = false;
 663         int i;
 664         u16 ifmodes = wiphy->interface_modes;
 665
 666 #ifdef CONFIG_PM
 667         if (WARN_ON(wiphy->wowlan &&
 668                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 669                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 670                 return -EINVAL;
 671         if (WARN_ON(wiphy->wowlan &&
 672                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 673                     !wiphy->wowlan->tcp))
 674                 return -EINVAL;
 675 #endif
 676         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 677                     (!rdev->ops->tdls_channel_switch ||
 678                      !rdev->ops->tdls_cancel_channel_switch)))
 679                 return -EINVAL;
 680
 681         if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
 682                     (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
 683                      !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
 684                      !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
 685                 return -EINVAL;
 686
 687         if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
 688                 return -EINVAL;
 689
 690         if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
 691                 return -EINVAL;
 692
 693         if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
 694                 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
 695                             !wiphy->pmsr_capa->ftm.non_asap))
 696                         return -EINVAL;
 697                 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
 698                             !wiphy->pmsr_capa->ftm.bandwidths))
 699                         return -EINVAL;
 700                 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
 701                                 ~(BIT(NL80211_PREAMBLE_LEGACY) |
 702                                   BIT(NL80211_PREAMBLE_HT) |
 703                                   BIT(NL80211_PREAMBLE_VHT) |
 704                                   BIT(NL80211_PREAMBLE_HE) |
 705                                   BIT(NL80211_PREAMBLE_DMG))))
 706                         return -EINVAL;
 707                 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
 708                              wiphy->pmsr_capa->ftm.non_trigger_based) &&
 709                             !(wiphy->pmsr_capa->ftm.preambles &
 710                               BIT(NL80211_PREAMBLE_HE))))
 711                         return -EINVAL;
 712                 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
 713                                 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
 714                                   BIT(NL80211_CHAN_WIDTH_20) |
 715                                   BIT(NL80211_CHAN_WIDTH_40) |
 716                                   BIT(NL80211_CHAN_WIDTH_80) |
 717                                   BIT(NL80211_CHAN_WIDTH_80P80) |
 718                                   BIT(NL80211_CHAN_WIDTH_160) |
 719                                   BIT(NL80211_CHAN_WIDTH_5) |
 720                                   BIT(NL80211_CHAN_WIDTH_10))))
 721                         return -EINVAL;
 722         }
 723
 724         /*
 725          * if a wiphy has unsupported modes for regulatory channel enforcement,
 726          * opt-out of enforcement checking
 727          */
 728         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 729                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 730                                        BIT(NL80211_IFTYPE_AP) |
 731                                        BIT(NL80211_IFTYPE_MESH_POINT) |
 732                                        BIT(NL80211_IFTYPE_P2P_GO) |
 733                                        BIT(NL80211_IFTYPE_ADHOC) |
 734                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 735                                        BIT(NL80211_IFTYPE_NAN) |
 736                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 737                                        BIT(NL80211_IFTYPE_MONITOR)))
 738                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 739
 740         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 741                     (wiphy->regulatory_flags &
 742                                         (REGULATORY_CUSTOM_REG |
 743                                          REGULATORY_STRICT_REG |
 744                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 745                                          REGULATORY_COUNTRY_IE_IGNORE))))
 746                 return -EINVAL;
 747
 748         if (WARN_ON(wiphy->coalesce &&
 749                     (!wiphy->coalesce->n_rules ||
 750                      !wiphy->coalesce->n_patterns) &&
 751                     (!wiphy->coalesce->pattern_min_len ||
 752                      wiphy->coalesce->pattern_min_len >
 753                         wiphy->coalesce->pattern_max_len)))
 754                 return -EINVAL;
 755
 756         if (WARN_ON(wiphy->ap_sme_capa &&
 757                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 758                 return -EINVAL;
 759
 760         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 761                 return -EINVAL;
 762
 763         if (WARN_ON(wiphy->addresses &&
 764                     !is_zero_ether_addr(wiphy->perm_addr) &&
 765                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 766                            ETH_ALEN)))
 767                 return -EINVAL;
 768
 769         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 770                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 771                      !rdev->ops->set_mac_acl)))
 772                 return -EINVAL;
 773
 774         /* assure only valid behaviours are flagged by driver
 775          * hence subtract 2 as bit 0 is invalid.
 776          */
 777         if (WARN_ON(wiphy->bss_select_support &&
 778                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 779                 return -EINVAL;
 780
 781         if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
 782                                             NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
 783                     (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
 784                 return -EINVAL;
 785
 786         if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
 787                     rdev->ops->update_connect_params))
 788                 return -EINVAL;
 789
 790         if (wiphy->addresses)
 791                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 792
 793         /* sanity check ifmodes */
 794         WARN_ON(!ifmodes);
 795         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 796         if (WARN_ON(ifmodes != wiphy->interface_modes))
 797                 wiphy->interface_modes = ifmodes;
 798
 799         res = wiphy_verify_combinations(wiphy);
 800         if (res)
 801                 return res;
 802
 803         /* sanity check supported bands/channels */
 804         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 805                 u16 types = 0;
 806                 bool have_he = false;
 807
 808                 sband = wiphy->bands[band];
 809                 if (!sband)
 810                         continue;
 811
 812                 sband->band = band;
 813                 if (WARN_ON(!sband->n_channels))
 814                         return -EINVAL;
 815                 /*
 816                  * on 60GHz or sub-1Ghz band, there are no legacy rates, so
 817                  * n_bitrates is 0
 818                  */
 819                 if (WARN_ON((band != NL80211_BAND_60GHZ &&
 820                              band != NL80211_BAND_S1GHZ) &&
 821                             !sband->n_bitrates))
 822                         return -EINVAL;
 823
 824                 if (WARN_ON(band == NL80211_BAND_6GHZ &&
 825                             (sband->ht_cap.ht_supported ||
 826                              sband->vht_cap.vht_supported)))
 827                         return -EINVAL;
 828
 829                 /*
 830                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 831                  * modify the sband's ht data even if the driver uses a
 832                  * global structure for that.
 833                  */
 834                 if (cfg80211_disable_40mhz_24ghz &&
 835                     band == NL80211_BAND_2GHZ &&
 836                     sband->ht_cap.ht_supported) {
 837                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 838                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 839                 }
 840
 841                 /*
 842                  * Since we use a u32 for rate bitmaps in
 843                  * ieee80211_get_response_rate, we cannot
 844                  * have more than 32 legacy rates.
 845                  */
 846                 if (WARN_ON(sband->n_bitrates > 32))
 847                         return -EINVAL;
 848
 849                 for (i = 0; i < sband->n_channels; i++) {
 850                         sband->channels[i].orig_flags =
 851                                 sband->channels[i].flags;
 852                         sband->channels[i].orig_mag = INT_MAX;
 853                         sband->channels[i].orig_mpwr =
 854                                 sband->channels[i].max_power;
 855                         sband->channels[i].band = band;
 856
 857                         if (WARN_ON(sband->channels[i].freq_offset >= 1000))
 858                                 return -EINVAL;
 859                 }
 860
 861                 for (i = 0; i < sband->n_iftype_data; i++) {
 862                         const struct ieee80211_sband_iftype_data *iftd;
 863
 864                         iftd = &sband->iftype_data[i];
 865
 866                         if (WARN_ON(!iftd->types_mask))
 867                                 return -EINVAL;
 868                         if (WARN_ON(types & iftd->types_mask))
 869                                 return -EINVAL;
 870
 871                         /* at least one piece of information must be present */
 872                         if (WARN_ON(!iftd->he_cap.has_he))
 873                                 return -EINVAL;
 874
 875                         types |= iftd->types_mask;
 876
 877                         if (i == 0)
 878                                 have_he = iftd->he_cap.has_he;
 879                         else
 880                                 have_he = have_he &&
 881                                           iftd->he_cap.has_he;
 882                 }
 883
 884                 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
 885                         return -EINVAL;
 886
 887                 have_band = true;
 888         }
 889
 890         if (!have_band) {
 891                 WARN_ON(1);
 892                 return -EINVAL;
 893         }
 894
 895         for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
 896                 /*
 897                  * Validate we have a policy (can be explicitly set to
 898                  * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
 899                  * we have at least one of doit/dumpit.
 900                  */
 901                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
 902                         return -EINVAL;
 903                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
 904                             !rdev->wiphy.vendor_commands[i].dumpit))
 905                         return -EINVAL;
 906         }
 907
 908 #ifdef CONFIG_PM
 909         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 910                     (!rdev->wiphy.wowlan->pattern_min_len ||
 911                      rdev->wiphy.wowlan->pattern_min_len >
 912                                 rdev->wiphy.wowlan->pattern_max_len)))
 913                 return -EINVAL;
 914 #endif
 915
 916         /* check and set up bitrates */
 917         ieee80211_set_bitrate_flags(wiphy);
 918
 919         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 920
 921         rtnl_lock();
 922         res = device_add(&rdev->wiphy.dev);
 923         if (res) {
 924                 rtnl_unlock();
 925                 return res;
 926         }
 927
 928         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 929         cfg80211_rdev_list_generation++;
 930
 931         /* add to debugfs */
 932         rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
 933                                                     ieee80211_debugfs_dir);
 934
 935         cfg80211_debugfs_rdev_add(rdev);
 936         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 937
 938         /* set up regulatory info */
 939         wiphy_regulatory_register(wiphy);
 940
 941         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 942                 struct regulatory_request request;
 943
 944                 request.wiphy_idx = get_wiphy_idx(wiphy);
 945                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 946                 request.alpha2[0] = '9';
 947                 request.alpha2[1] = '9';
 948
 949                 nl80211_send_reg_change_event(&request);
 950         }
 951
 952         /* Check that nobody globally advertises any capabilities they do not
 953          * advertise on all possible interface types.
 954          */
 955         if (wiphy->extended_capabilities_len &&
 956             wiphy->num_iftype_ext_capab &&
 957             wiphy->iftype_ext_capab) {
 958                 u8 supported_on_all, j;
 959                 const struct wiphy_iftype_ext_capab *capab;
 960
 961                 capab = wiphy->iftype_ext_capab;
 962                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
 963                         if (capab[0].extended_capabilities_len > j)
 964                                 supported_on_all =
 965                                         capab[0].extended_capabilities[j];
 966                         else
 967                                 supported_on_all = 0x00;
 968                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
 969                                 if (j >= capab[i].extended_capabilities_len) {
 970                                         supported_on_all = 0x00;
 971                                         break;
 972                                 }
 973                                 supported_on_all &=
 974                                         capab[i].extended_capabilities[j];
 975                         }
 976                         if (WARN_ON(wiphy->extended_capabilities[j] &
 977                                     ~supported_on_all))
 978                                 break;
 979                 }
 980         }
 981
 982         rdev->wiphy.registered = true;
 983         rtnl_unlock();
 984
 985         res = rfkill_register(rdev->wiphy.rfkill);
 986         if (res) {
 987                 rfkill_destroy(rdev->wiphy.rfkill);
 988                 rdev->wiphy.rfkill = NULL;
 989                 wiphy_unregister(&rdev->wiphy);
 990                 return res;
 991         }
 992
 993         return 0;
 994 }
 995 EXPORT_SYMBOL(wiphy_register);
 996
 997 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 998 {
 999         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1000
1001         if (!rdev->ops->rfkill_poll)
1002                 return;
1003         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
1004         rfkill_resume_polling(wiphy->rfkill);
1005 }
1006 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
1007
1008 void wiphy_unregister(struct wiphy *wiphy)
1009 {
1010         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1011
1012         wait_event(rdev->dev_wait, ({
1013                 int __count;
1014                 wiphy_lock(&rdev->wiphy);
1015                 __count = rdev->opencount;
1016                 wiphy_unlock(&rdev->wiphy);
1017                 __count == 0; }));
1018
1019         if (rdev->wiphy.rfkill)
1020                 rfkill_unregister(rdev->wiphy.rfkill);
1021
1022         rtnl_lock();
1023         wiphy_lock(&rdev->wiphy);
1024         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1025         rdev->wiphy.registered = false;
1026
1027         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1028
1029         /*
1030          * First remove the hardware from everywhere, this makes
1031          * it impossible to find from userspace.
1032          */
1033         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1034         list_del_rcu(&rdev->list);
1035         synchronize_rcu();
1036
1037         /*
1038          * If this device got a regulatory hint tell core its
1039          * free to listen now to a new shiny device regulatory hint
1040          */
1041         wiphy_regulatory_deregister(wiphy);
1042
1043         cfg80211_rdev_list_generation++;
1044         device_del(&rdev->wiphy.dev);
1045
1046         wiphy_unlock(&rdev->wiphy);
1047         rtnl_unlock();
1048
1049         flush_work(&rdev->scan_done_wk);
1050         cancel_work_sync(&rdev->conn_work);
1051         flush_work(&rdev->event_work);
1052         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1053         cancel_delayed_work_sync(&rdev->background_cac_done_wk);
1054         flush_work(&rdev->destroy_work);
1055         flush_work(&rdev->sched_scan_stop_wk);
1056         flush_work(&rdev->propagate_radar_detect_wk);
1057         flush_work(&rdev->propagate_cac_done_wk);
1058         flush_work(&rdev->mgmt_registrations_update_wk);
1059         flush_work(&rdev->background_cac_abort_wk);
1060
1061 #ifdef CONFIG_PM
1062         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1063                 rdev_set_wakeup(rdev, false);
1064 #endif
1065         cfg80211_rdev_free_wowlan(rdev);
1066         cfg80211_rdev_free_coalesce(rdev);
1067 }
1068 EXPORT_SYMBOL(wiphy_unregister);
1069
1070 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1071 {
1072         struct cfg80211_internal_bss *scan, *tmp;
1073         struct cfg80211_beacon_registration *reg, *treg;
1074         rfkill_destroy(rdev->wiphy.rfkill);
1075         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1076                 list_del(&reg->list);
1077                 kfree(reg);
1078         }
1079         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1080                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1081         mutex_destroy(&rdev->wiphy.mtx);
1082
1083         /*
1084          * The 'regd' can only be non-NULL if we never finished
1085          * initializing the wiphy and thus never went through the
1086          * unregister path - e.g. in failure scenarios. Thus, it
1087          * cannot have been visible to anyone if non-NULL, so we
1088          * can just free it here.
1089          */
1090         kfree(rcu_dereference_raw(rdev->wiphy.regd));
1091
1092         kfree(rdev);
1093 }
1094
1095 void wiphy_free(struct wiphy *wiphy)
1096 {
1097         put_device(&wiphy->dev);
1098 }
1099 EXPORT_SYMBOL(wiphy_free);
1100
1101 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
1102                                       enum rfkill_hard_block_reasons reason)
1103 {
1104         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1105
1106         if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason))
1107                 schedule_work(&rdev->rfkill_block);
1108 }
1109 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);
1110
1111 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1112 {
1113         kfree(wdev->cqm_config);
1114         wdev->cqm_config = NULL;
1115 }
1116
1117 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
1118                                       bool unregister_netdev)
1119 {
1120         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1121
1122         ASSERT_RTNL();
1123         lockdep_assert_held(&rdev->wiphy.mtx);
1124
1125         flush_work(&wdev->pmsr_free_wk);
1126
1127         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1128
1129         wdev->registered = false;
1130
1131         if (wdev->netdev) {
1132                 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
1133                 if (unregister_netdev)
1134                         unregister_netdevice(wdev->netdev);
1135         }
1136
1137         list_del_rcu(&wdev->list);
1138         synchronize_net();
1139         rdev->devlist_generation++;
1140
1141         cfg80211_mlme_purge_registrations(wdev);
1142
1143         switch (wdev->iftype) {
1144         case NL80211_IFTYPE_P2P_DEVICE:
1145                 cfg80211_stop_p2p_device(rdev, wdev);
1146                 break;
1147         case NL80211_IFTYPE_NAN:
1148                 cfg80211_stop_nan(rdev, wdev);
1149                 break;
1150         default:
1151                 break;
1152         }
1153
1154 #ifdef CONFIG_CFG80211_WEXT
1155         kfree_sensitive(wdev->wext.keys);
1156         wdev->wext.keys = NULL;
1157 #endif
1158         /* only initialized if we have a netdev */
1159         if (wdev->netdev)
1160                 flush_work(&wdev->disconnect_wk);
1161
1162         cfg80211_cqm_config_free(wdev);
1163
1164         /*
1165          * Ensure that all events have been processed and
1166          * freed.
1167          */
1168         cfg80211_process_wdev_events(wdev);
1169
1170         if (WARN_ON(wdev->current_bss)) {
1171                 cfg80211_unhold_bss(wdev->current_bss);
1172                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1173                 wdev->current_bss = NULL;
1174         }
1175 }
1176
1177 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1178 {
1179         _cfg80211_unregister_wdev(wdev, true);
1180 }
1181 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1182
1183 static const struct device_type wiphy_type = {
1184         .name   = "wlan",
1185 };
1186
1187 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1188                                enum nl80211_iftype iftype, int num)
1189 {
1190         lockdep_assert_held(&rdev->wiphy.mtx);
1191
1192         rdev->num_running_ifaces += num;
1193         if (iftype == NL80211_IFTYPE_MONITOR)
1194                 rdev->num_running_monitor_ifaces += num;
1195 }
1196
1197 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1198                       struct wireless_dev *wdev)
1199 {
1200         struct net_device *dev = wdev->netdev;
1201         struct cfg80211_sched_scan_request *pos, *tmp;
1202
1203         lockdep_assert_held(&rdev->wiphy.mtx);
1204         ASSERT_WDEV_LOCK(wdev);
1205
1206         cfg80211_pmsr_wdev_down(wdev);
1207
1208         cfg80211_stop_background_radar_detection(wdev);
1209
1210         switch (wdev->iftype) {
1211         case NL80211_IFTYPE_ADHOC:
1212                 __cfg80211_leave_ibss(rdev, dev, true);
1213                 break;
1214         case NL80211_IFTYPE_P2P_CLIENT:
1215         case NL80211_IFTYPE_STATION:
1216                 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1217                                          list) {
1218                         if (dev == pos->dev)
1219                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1220                 }
1221
1222 #ifdef CONFIG_CFG80211_WEXT
1223                 kfree(wdev->wext.ie);
1224                 wdev->wext.ie = NULL;
1225                 wdev->wext.ie_len = 0;
1226                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1227 #endif
1228                 cfg80211_disconnect(rdev, dev,
1229                                     WLAN_REASON_DEAUTH_LEAVING, true);
1230                 break;
1231         case NL80211_IFTYPE_MESH_POINT:
1232                 __cfg80211_leave_mesh(rdev, dev);
1233                 break;
1234         case NL80211_IFTYPE_AP:
1235         case NL80211_IFTYPE_P2P_GO:
1236                 __cfg80211_stop_ap(rdev, dev, true);
1237                 break;
1238         case NL80211_IFTYPE_OCB:
1239                 __cfg80211_leave_ocb(rdev, dev);
1240                 break;
1241         case NL80211_IFTYPE_P2P_DEVICE:
1242         case NL80211_IFTYPE_NAN:
1243                 /* cannot happen, has no netdev */
1244                 break;
1245         case NL80211_IFTYPE_AP_VLAN:
1246         case NL80211_IFTYPE_MONITOR:
1247                 /* nothing to do */
1248                 break;
1249         case NL80211_IFTYPE_UNSPECIFIED:
1250         case NL80211_IFTYPE_WDS:
1251         case NUM_NL80211_IFTYPES:
1252                 /* invalid */
1253                 break;
1254         }
1255 }
1256
1257 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1258                     struct wireless_dev *wdev)
1259 {
1260         wdev_lock(wdev);
1261         __cfg80211_leave(rdev, wdev);
1262         wdev_unlock(wdev);
1263 }
1264
1265 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1266                          gfp_t gfp)
1267 {
1268         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1269         struct cfg80211_event *ev;
1270         unsigned long flags;
1271
1272         trace_cfg80211_stop_iface(wiphy, wdev);
1273
1274         ev = kzalloc(sizeof(*ev), gfp);
1275         if (!ev)
1276                 return;
1277
1278         ev->type = EVENT_STOPPED;
1279
1280         spin_lock_irqsave(&wdev->event_lock, flags);
1281         list_add_tail(&ev->list, &wdev->event_list);
1282         spin_unlock_irqrestore(&wdev->event_lock, flags);
1283         queue_work(cfg80211_wq, &rdev->event_work);
1284 }
1285 EXPORT_SYMBOL(cfg80211_stop_iface);
1286
1287 void cfg80211_init_wdev(struct wireless_dev *wdev)
1288 {
1289         mutex_init(&wdev->mtx);
1290         INIT_LIST_HEAD(&wdev->event_list);
1291         spin_lock_init(&wdev->event_lock);
1292         INIT_LIST_HEAD(&wdev->mgmt_registrations);
1293         INIT_LIST_HEAD(&wdev->pmsr_list);
1294         spin_lock_init(&wdev->pmsr_lock);
1295         INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1296
1297 #ifdef CONFIG_CFG80211_WEXT
1298         wdev->wext.default_key = -1;
1299         wdev->wext.default_mgmt_key = -1;
1300         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1301 #endif
1302
1303         if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1304                 wdev->ps = true;
1305         else
1306                 wdev->ps = false;
1307         /* allow mac80211 to determine the timeout */
1308         wdev->ps_timeout = -1;
1309
1310         if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1311              wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1312              wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1313                 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1314
1315         INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1316 }
1317
1318 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1319                             struct wireless_dev *wdev)
1320 {
1321         ASSERT_RTNL();
1322         lockdep_assert_held(&rdev->wiphy.mtx);
1323
1324         /*
1325          * We get here also when the interface changes network namespaces,
1326          * as it's registered into the new one, but we don't want it to
1327          * change ID in that case. Checking if the ID is already assigned
1328          * works, because 0 isn't considered a valid ID and the memory is
1329          * 0-initialized.
1330          */
1331         if (!wdev->identifier)
1332                 wdev->identifier = ++rdev->wdev_id;
1333         list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1334         rdev->devlist_generation++;
1335         wdev->registered = true;
1336
1337         if (wdev->netdev &&
1338             sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj,
1339                               "phy80211"))
1340                 pr_err("failed to add phy80211 symlink to netdev!\n");
1341
1342         nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1343 }
1344
1345 int cfg80211_register_netdevice(struct net_device *dev)
1346 {
1347         struct wireless_dev *wdev = dev->ieee80211_ptr;
1348         struct cfg80211_registered_device *rdev;
1349         int ret;
1350
1351         ASSERT_RTNL();
1352
1353         if (WARN_ON(!wdev))
1354                 return -EINVAL;
1355
1356         rdev = wiphy_to_rdev(wdev->wiphy);
1357
1358         lockdep_assert_held(&rdev->wiphy.mtx);
1359
1360         /* we'll take care of this */
1361         wdev->registered = true;
1362         wdev->registering = true;
1363         ret = register_netdevice(dev);
1364         if (ret)
1365                 goto out;
1366
1367         cfg80211_register_wdev(rdev, wdev);
1368         ret = 0;
1369 out:
1370         wdev->registering = false;
1371         if (ret)
1372                 wdev->registered = false;
1373         return ret;
1374 }
1375 EXPORT_SYMBOL(cfg80211_register_netdevice);
1376
1377 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1378                                          unsigned long state, void *ptr)
1379 {
1380         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1381         struct wireless_dev *wdev = dev->ieee80211_ptr;
1382         struct cfg80211_registered_device *rdev;
1383         struct cfg80211_sched_scan_request *pos, *tmp;
1384
1385         if (!wdev)
1386                 return NOTIFY_DONE;
1387
1388         rdev = wiphy_to_rdev(wdev->wiphy);
1389
1390         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1391
1392         switch (state) {
1393         case NETDEV_POST_INIT:
1394                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1395                 wdev->netdev = dev;
1396                 /* can only change netns with wiphy */
1397                 dev->features |= NETIF_F_NETNS_LOCAL;
1398
1399                 cfg80211_init_wdev(wdev);
1400                 break;
1401         case NETDEV_REGISTER:
1402                 if (!wdev->registered) {
1403                         wiphy_lock(&rdev->wiphy);
1404                         cfg80211_register_wdev(rdev, wdev);
1405                         wiphy_unlock(&rdev->wiphy);
1406                 }
1407                 break;
1408         case NETDEV_UNREGISTER:
1409                 /*
1410                  * It is possible to get NETDEV_UNREGISTER multiple times,
1411                  * so check wdev->registered.
1412                  */
1413                 if (wdev->registered && !wdev->registering) {
1414                         wiphy_lock(&rdev->wiphy);
1415                         _cfg80211_unregister_wdev(wdev, false);
1416                         wiphy_unlock(&rdev->wiphy);
1417                 }
1418                 break;
1419         case NETDEV_GOING_DOWN:
1420                 wiphy_lock(&rdev->wiphy);
1421                 cfg80211_leave(rdev, wdev);
1422                 wiphy_unlock(&rdev->wiphy);
1423                 break;
1424         case NETDEV_DOWN:
1425                 wiphy_lock(&rdev->wiphy);
1426                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1427                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1428                         if (WARN_ON(!rdev->scan_req->notified &&
1429                                     (!rdev->int_scan_req ||
1430                                      !rdev->int_scan_req->notified)))
1431                                 rdev->scan_req->info.aborted = true;
1432                         ___cfg80211_scan_done(rdev, false);
1433                 }
1434
1435                 list_for_each_entry_safe(pos, tmp,
1436                                          &rdev->sched_scan_req_list, list) {
1437                         if (WARN_ON(pos->dev == wdev->netdev))
1438                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1439                 }
1440
1441                 rdev->opencount--;
1442                 wiphy_unlock(&rdev->wiphy);
1443                 wake_up(&rdev->dev_wait);
1444                 break;
1445         case NETDEV_UP:
1446                 wiphy_lock(&rdev->wiphy);
1447                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1448                 wdev_lock(wdev);
1449                 switch (wdev->iftype) {
1450 #ifdef CONFIG_CFG80211_WEXT
1451                 case NL80211_IFTYPE_ADHOC:
1452                         cfg80211_ibss_wext_join(rdev, wdev);
1453                         break;
1454                 case NL80211_IFTYPE_STATION:
1455                         cfg80211_mgd_wext_connect(rdev, wdev);
1456                         break;
1457 #endif
1458 #ifdef CONFIG_MAC80211_MESH
1459                 case NL80211_IFTYPE_MESH_POINT:
1460                         {
1461                                 /* backward compat code... */
1462                                 struct mesh_setup setup;
1463                                 memcpy(&setup, &default_mesh_setup,
1464                                                 sizeof(setup));
1465                                  /* back compat only needed for mesh_id */
1466                                 setup.mesh_id = wdev->ssid;
1467                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1468                                 if (wdev->mesh_id_up_len)
1469                                         __cfg80211_join_mesh(rdev, dev,
1470                                                         &setup,
1471                                                         &default_mesh_config);
1472                                 break;
1473                         }
1474 #endif
1475                 default:
1476                         break;
1477                 }
1478                 wdev_unlock(wdev);
1479                 rdev->opencount++;
1480
1481                 /*
1482                  * Configure power management to the driver here so that its
1483                  * correctly set also after interface type changes etc.
1484                  */
1485                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1486                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1487                     rdev->ops->set_power_mgmt &&
1488                     rdev_set_power_mgmt(rdev, dev, wdev->ps,
1489                                         wdev->ps_timeout)) {
1490                         /* assume this means it's off */
1491                         wdev->ps = false;
1492                 }
1493                 wiphy_unlock(&rdev->wiphy);
1494                 break;
1495         case NETDEV_PRE_UP:
1496                 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1497                                              wdev->use_4addr, 0))
1498                         return notifier_from_errno(-EOPNOTSUPP);
1499
1500                 if (rfkill_blocked(rdev->wiphy.rfkill))
1501                         return notifier_from_errno(-ERFKILL);
1502                 break;
1503         default:
1504                 return NOTIFY_DONE;
1505         }
1506
1507         wireless_nlevent_flush();
1508
1509         return NOTIFY_OK;
1510 }
1511
1512 static struct notifier_block cfg80211_netdev_notifier = {
1513         .notifier_call = cfg80211_netdev_notifier_call,
1514 };
1515
1516 static void __net_exit cfg80211_pernet_exit(struct net *net)
1517 {
1518         struct cfg80211_registered_device *rdev;
1519
1520         rtnl_lock();
1521         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1522                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1523                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1524         }
1525         rtnl_unlock();
1526 }
1527
1528 static struct pernet_operations cfg80211_pernet_ops = {
1529         .exit = cfg80211_pernet_exit,
1530 };
1531
1532 static int __init cfg80211_init(void)
1533 {
1534         int err;
1535
1536         err = register_pernet_device(&cfg80211_pernet_ops);
1537         if (err)
1538                 goto out_fail_pernet;
1539
1540         err = wiphy_sysfs_init();
1541         if (err)
1542                 goto out_fail_sysfs;
1543
1544         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1545         if (err)
1546                 goto out_fail_notifier;
1547
1548         err = nl80211_init();
1549         if (err)
1550                 goto out_fail_nl80211;
1551
1552         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1553
1554         err = regulatory_init();
1555         if (err)
1556                 goto out_fail_reg;
1557
1558         cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1559         if (!cfg80211_wq) {
1560                 err = -ENOMEM;
1561                 goto out_fail_wq;
1562         }
1563
1564         return 0;
1565
1566 out_fail_wq:
1567         regulatory_exit();
1568 out_fail_reg:
1569         debugfs_remove(ieee80211_debugfs_dir);
1570         nl80211_exit();
1571 out_fail_nl80211:
1572         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1573 out_fail_notifier:
1574         wiphy_sysfs_exit();
1575 out_fail_sysfs:
1576         unregister_pernet_device(&cfg80211_pernet_ops);
1577 out_fail_pernet:
1578         return err;
1579 }
1580 fs_initcall(cfg80211_init);
1581
1582 static void __exit cfg80211_exit(void)
1583 {
1584         debugfs_remove(ieee80211_debugfs_dir);
1585         nl80211_exit();
1586         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1587         wiphy_sysfs_exit();
1588         regulatory_exit();
1589         unregister_pernet_device(&cfg80211_pernet_ops);
1590         destroy_workqueue(cfg80211_wq);
1591 }
1592 module_exit(cfg80211_exit);