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 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 (rdev->wiphy.debugfsdir &&
 146             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 147                             rdev->wiphy.debugfsdir,
 148                             rdev->wiphy.debugfsdir->d_parent,
 149                             newname))
 150                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 151
 152         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 153
 154         return 0;
 155 }
 156
 157 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 158                           struct net *net)
 159 {
 160         struct wireless_dev *wdev;
 161         int err = 0;
 162
 163         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 164                 return -EOPNOTSUPP;
 165
 166         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 167                 if (!wdev->netdev)
 168                         continue;
 169                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 170                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 171                 if (err)
 172                         break;
 173                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 174         }
 175
 176         if (err) {
 177                 /* failed -- clean up to old netns */
 178                 net = wiphy_net(&rdev->wiphy);
 179
 180                 list_for_each_entry_continue_reverse(wdev,
 181                                                      &rdev->wiphy.wdev_list,
 182                                                      list) {
 183                         if (!wdev->netdev)
 184                                 continue;
 185                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 186                         err = dev_change_net_namespace(wdev->netdev, net,
 187                                                         "wlan%d");
 188                         WARN_ON(err);
 189                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 190                 }
 191
 192                 return err;
 193         }
 194
 195         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 196                 if (!wdev->netdev)
 197                         continue;
 198                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
 199         }
 200         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 201
 202         wiphy_net_set(&rdev->wiphy, net);
 203
 204         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 205         WARN_ON(err);
 206
 207         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 208         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 209                 if (!wdev->netdev)
 210                         continue;
 211                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
 212         }
 213
 214         return 0;
 215 }
 216
 217 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 218 {
 219         struct cfg80211_registered_device *rdev = data;
 220
 221         rdev_rfkill_poll(rdev);
 222 }
 223
 224 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 225                               struct wireless_dev *wdev)
 226 {
 227         ASSERT_RTNL();
 228
 229         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 230                 return;
 231
 232         if (!wdev_running(wdev))
 233                 return;
 234
 235         rdev_stop_p2p_device(rdev, wdev);
 236         wdev->is_running = false;
 237
 238         rdev->opencount--;
 239
 240         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 241                 if (WARN_ON(!rdev->scan_req->notified))
 242                         rdev->scan_req->info.aborted = true;
 243                 ___cfg80211_scan_done(rdev, false);
 244         }
 245 }
 246
 247 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
 248                        struct wireless_dev *wdev)
 249 {
 250         ASSERT_RTNL();
 251
 252         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
 253                 return;
 254
 255         if (!wdev_running(wdev))
 256                 return;
 257
 258         rdev_stop_nan(rdev, wdev);
 259         wdev->is_running = false;
 260
 261         rdev->opencount--;
 262 }
 263
 264 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 265 {
 266         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 267         struct wireless_dev *wdev;
 268
 269         ASSERT_RTNL();
 270
 271         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 272                 if (wdev->netdev) {
 273                         dev_close(wdev->netdev);
 274                         continue;
 275                 }
 276                 /* otherwise, check iftype */
 277                 switch (wdev->iftype) {
 278                 case NL80211_IFTYPE_P2P_DEVICE:
 279                         cfg80211_stop_p2p_device(rdev, wdev);
 280                         break;
 281                 case NL80211_IFTYPE_NAN:
 282                         cfg80211_stop_nan(rdev, wdev);
 283                         break;
 284                 default:
 285                         break;
 286                 }
 287         }
 288 }
 289 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 290
 291 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 292 {
 293         struct cfg80211_registered_device *rdev = data;
 294
 295         if (!blocked)
 296                 return 0;
 297
 298         rtnl_lock();
 299         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 300         rtnl_unlock();
 301
 302         return 0;
 303 }
 304
 305 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 306 {
 307         struct cfg80211_registered_device *rdev;
 308
 309         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 310         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 311 }
 312
 313 static void cfg80211_event_work(struct work_struct *work)
 314 {
 315         struct cfg80211_registered_device *rdev;
 316
 317         rdev = container_of(work, struct cfg80211_registered_device,
 318                             event_work);
 319
 320         rtnl_lock();
 321         cfg80211_process_rdev_events(rdev);
 322         rtnl_unlock();
 323 }
 324
 325 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 326 {
 327         struct wireless_dev *wdev, *tmp;
 328
 329         ASSERT_RTNL();
 330
 331         list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
 332                 if (wdev->nl_owner_dead)
 333                         rdev_del_virtual_intf(rdev, wdev);
 334         }
 335 }
 336
 337 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 338 {
 339         struct cfg80211_registered_device *rdev;
 340
 341         rdev = container_of(work, struct cfg80211_registered_device,
 342                             destroy_work);
 343
 344         rtnl_lock();
 345         cfg80211_destroy_ifaces(rdev);
 346         rtnl_unlock();
 347 }
 348
 349 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
 350 {
 351         struct cfg80211_registered_device *rdev;
 352         struct cfg80211_sched_scan_request *req, *tmp;
 353
 354         rdev = container_of(work, struct cfg80211_registered_device,
 355                            sched_scan_stop_wk);
 356
 357         rtnl_lock();
 358         list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
 359                 if (req->nl_owner_dead)
 360                         cfg80211_stop_sched_scan_req(rdev, req, false);
 361         }
 362         rtnl_unlock();
 363 }
 364
 365 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
 366 {
 367         struct cfg80211_registered_device *rdev;
 368
 369         rdev = container_of(work, struct cfg80211_registered_device,
 370                             propagate_radar_detect_wk);
 371
 372         rtnl_lock();
 373
 374         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
 375                                        NL80211_DFS_UNAVAILABLE,
 376                                        NL80211_RADAR_DETECTED);
 377
 378         rtnl_unlock();
 379 }
 380
 381 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
 382 {
 383         struct cfg80211_registered_device *rdev;
 384
 385         rdev = container_of(work, struct cfg80211_registered_device,
 386                             propagate_cac_done_wk);
 387
 388         rtnl_lock();
 389
 390         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
 391                                        NL80211_DFS_AVAILABLE,
 392                                        NL80211_RADAR_CAC_FINISHED);
 393
 394         rtnl_unlock();
 395 }
 396
 397 /* exported functions */
 398
 399 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 400                            const char *requested_name)
 401 {
 402         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 403
 404         struct cfg80211_registered_device *rdev;
 405         int alloc_size;
 406
 407         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 408         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 409         WARN_ON(ops->connect && !ops->disconnect);
 410         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 411         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 412         WARN_ON(ops->add_station && !ops->del_station);
 413         WARN_ON(ops->add_mpath && !ops->del_mpath);
 414         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 415         WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
 416         WARN_ON(ops->start_ap && !ops->stop_ap);
 417         WARN_ON(ops->join_ocb && !ops->leave_ocb);
 418         WARN_ON(ops->suspend && !ops->resume);
 419         WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
 420         WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
 421         WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
 422         WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
 423
 424         alloc_size = sizeof(*rdev) + sizeof_priv;
 425
 426         rdev = kzalloc(alloc_size, GFP_KERNEL);
 427         if (!rdev)
 428                 return NULL;
 429
 430         rdev->ops = ops;
 431
 432         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 433
 434         if (unlikely(rdev->wiphy_idx < 0)) {
 435                 /* ugh, wrapped! */
 436                 atomic_dec(&wiphy_counter);
 437                 kfree(rdev);
 438                 return NULL;
 439         }
 440
 441         /* atomic_inc_return makes it start at 1, make it start at 0 */
 442         rdev->wiphy_idx--;
 443
 444         /* give it a proper name */
 445         if (requested_name && requested_name[0]) {
 446                 int rv;
 447
 448                 rtnl_lock();
 449                 rv = cfg80211_dev_check_name(rdev, requested_name);
 450
 451                 if (rv < 0) {
 452                         rtnl_unlock();
 453                         goto use_default_name;
 454                 }
 455
 456                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 457                 rtnl_unlock();
 458                 if (rv)
 459                         goto use_default_name;
 460         } else {
 461                 int rv;
 462
 463 use_default_name:
 464                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 465                  * the restrictions on phy names.  Probably this call could
 466                  * fail if some other part of the kernel (re)named a device
 467                  * phyX.  But, might should add some locking and check return
 468                  * value, and use a different name if this one exists?
 469                  */
 470                 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 471                 if (rv < 0) {
 472                         kfree(rdev);
 473                         return NULL;
 474                 }
 475         }
 476
 477         INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
 478         INIT_LIST_HEAD(&rdev->beacon_registrations);
 479         spin_lock_init(&rdev->beacon_registrations_lock);
 480         spin_lock_init(&rdev->bss_lock);
 481         INIT_LIST_HEAD(&rdev->bss_list);
 482         INIT_LIST_HEAD(&rdev->sched_scan_req_list);
 483         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 484         INIT_LIST_HEAD(&rdev->mlme_unreg);
 485         spin_lock_init(&rdev->mlme_unreg_lock);
 486         INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
 487         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 488                           cfg80211_dfs_channels_update_work);
 489 #ifdef CONFIG_CFG80211_WEXT
 490         rdev->wiphy.wext = &cfg80211_wext_handler;
 491 #endif
 492
 493         device_initialize(&rdev->wiphy.dev);
 494         rdev->wiphy.dev.class = &ieee80211_class;
 495         rdev->wiphy.dev.platform_data = rdev;
 496         device_enable_async_suspend(&rdev->wiphy.dev);
 497
 498         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 499         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 500         INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
 501         INIT_WORK(&rdev->propagate_radar_detect_wk,
 502                   cfg80211_propagate_radar_detect_wk);
 503         INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
 504
 505 #ifdef CONFIG_CFG80211_DEFAULT_PS
 506         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 507 #endif
 508
 509         wiphy_net_set(&rdev->wiphy, &init_net);
 510
 511         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 512         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 513                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 514                                    &rdev->rfkill_ops, rdev);
 515
 516         if (!rdev->rfkill) {
 517                 wiphy_free(&rdev->wiphy);
 518                 return NULL;
 519         }
 520
 521         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 522         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 523         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 524
 525         init_waitqueue_head(&rdev->dev_wait);
 526
 527         /*
 528          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 529          * Fragmentation and RTS threshold are disabled by default with the
 530          * special -1 value.
 531          */
 532         rdev->wiphy.retry_short = 7;
 533         rdev->wiphy.retry_long = 4;
 534         rdev->wiphy.frag_threshold = (u32) -1;
 535         rdev->wiphy.rts_threshold = (u32) -1;
 536         rdev->wiphy.coverage_class = 0;
 537
 538         rdev->wiphy.max_num_csa_counters = 1;
 539
 540         rdev->wiphy.max_sched_scan_plans = 1;
 541         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 542
 543         return &rdev->wiphy;
 544 }
 545 EXPORT_SYMBOL(wiphy_new_nm);
 546
 547 static int wiphy_verify_combinations(struct wiphy *wiphy)
 548 {
 549         const struct ieee80211_iface_combination *c;
 550         int i, j;
 551
 552         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 553                 u32 cnt = 0;
 554                 u16 all_iftypes = 0;
 555
 556                 c = &wiphy->iface_combinations[i];
 557
 558                 /*
 559                  * Combinations with just one interface aren't real,
 560                  * however we make an exception for DFS.
 561                  */
 562                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 563                         return -EINVAL;
 564
 565                 /* Need at least one channel */
 566                 if (WARN_ON(!c->num_different_channels))
 567                         return -EINVAL;
 568
 569                 /*
 570                  * Put a sane limit on maximum number of different
 571                  * channels to simplify channel accounting code.
 572                  */
 573                 if (WARN_ON(c->num_different_channels >
 574                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 575                         return -EINVAL;
 576
 577                 /* DFS only works on one channel. */
 578                 if (WARN_ON(c->radar_detect_widths &&
 579                             (c->num_different_channels > 1)))
 580                         return -EINVAL;
 581
 582                 if (WARN_ON(!c->n_limits))
 583                         return -EINVAL;
 584
 585                 for (j = 0; j < c->n_limits; j++) {
 586                         u16 types = c->limits[j].types;
 587
 588                         /* interface types shouldn't overlap */
 589                         if (WARN_ON(types & all_iftypes))
 590                                 return -EINVAL;
 591                         all_iftypes |= types;
 592
 593                         if (WARN_ON(!c->limits[j].max))
 594                                 return -EINVAL;
 595
 596                         /* Shouldn't list software iftypes in combinations! */
 597                         if (WARN_ON(wiphy->software_iftypes & types))
 598                                 return -EINVAL;
 599
 600                         /* Only a single P2P_DEVICE can be allowed */
 601                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 602                                     c->limits[j].max > 1))
 603                                 return -EINVAL;
 604
 605                         /* Only a single NAN can be allowed */
 606                         if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
 607                                     c->limits[j].max > 1))
 608                                 return -EINVAL;
 609
 610                         /*
 611                          * This isn't well-defined right now. If you have an
 612                          * IBSS interface, then its beacon interval may change
 613                          * by joining other networks, and nothing prevents it
 614                          * from doing that.
 615                          * So technically we probably shouldn't even allow AP
 616                          * and IBSS in the same interface, but it seems that
 617                          * some drivers support that, possibly only with fixed
 618                          * beacon intervals for IBSS.
 619                          */
 620                         if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
 621                                     c->beacon_int_min_gcd)) {
 622                                 return -EINVAL;
 623                         }
 624
 625                         cnt += c->limits[j].max;
 626                         /*
 627                          * Don't advertise an unsupported type
 628                          * in a combination.
 629                          */
 630                         if (WARN_ON((wiphy->interface_modes & types) != types))
 631                                 return -EINVAL;
 632                 }
 633
 634 #ifndef CONFIG_WIRELESS_WDS
 635                 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
 636                         return -EINVAL;
 637 #endif
 638
 639                 /* You can't even choose that many! */
 640                 if (WARN_ON(cnt < c->max_interfaces))
 641                         return -EINVAL;
 642         }
 643
 644         return 0;
 645 }
 646
 647 int wiphy_register(struct wiphy *wiphy)
 648 {
 649         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 650         int res;
 651         enum nl80211_band band;
 652         struct ieee80211_supported_band *sband;
 653         bool have_band = false;
 654         int i;
 655         u16 ifmodes = wiphy->interface_modes;
 656
 657 #ifdef CONFIG_PM
 658         if (WARN_ON(wiphy->wowlan &&
 659                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 660                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 661                 return -EINVAL;
 662         if (WARN_ON(wiphy->wowlan &&
 663                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 664                     !wiphy->wowlan->tcp))
 665                 return -EINVAL;
 666 #endif
 667         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 668                     (!rdev->ops->tdls_channel_switch ||
 669                      !rdev->ops->tdls_cancel_channel_switch)))
 670                 return -EINVAL;
 671
 672         if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
 673                     (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
 674                      !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
 675                      !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
 676                 return -EINVAL;
 677
 678 #ifndef CONFIG_WIRELESS_WDS
 679         if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
 680                 return -EINVAL;
 681 #endif
 682
 683         if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
 684                 return -EINVAL;
 685
 686         if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
 687                 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
 688                             !wiphy->pmsr_capa->ftm.non_asap))
 689                         return -EINVAL;
 690                 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
 691                             !wiphy->pmsr_capa->ftm.bandwidths))
 692                         return -EINVAL;
 693                 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
 694                                 ~(BIT(NL80211_PREAMBLE_LEGACY) |
 695                                   BIT(NL80211_PREAMBLE_HT) |
 696                                   BIT(NL80211_PREAMBLE_VHT) |
 697                                   BIT(NL80211_PREAMBLE_DMG))))
 698                         return -EINVAL;
 699                 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
 700                                 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
 701                                   BIT(NL80211_CHAN_WIDTH_20) |
 702                                   BIT(NL80211_CHAN_WIDTH_40) |
 703                                   BIT(NL80211_CHAN_WIDTH_80) |
 704                                   BIT(NL80211_CHAN_WIDTH_80P80) |
 705                                   BIT(NL80211_CHAN_WIDTH_160) |
 706                                   BIT(NL80211_CHAN_WIDTH_5) |
 707                                   BIT(NL80211_CHAN_WIDTH_10))))
 708                         return -EINVAL;
 709         }
 710
 711         /*
 712          * if a wiphy has unsupported modes for regulatory channel enforcement,
 713          * opt-out of enforcement checking
 714          */
 715         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 716                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 717                                        BIT(NL80211_IFTYPE_AP) |
 718                                        BIT(NL80211_IFTYPE_P2P_GO) |
 719                                        BIT(NL80211_IFTYPE_ADHOC) |
 720                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 721                                        BIT(NL80211_IFTYPE_NAN) |
 722                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 723                                        BIT(NL80211_IFTYPE_MONITOR)))
 724                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 725
 726         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 727                     (wiphy->regulatory_flags &
 728                                         (REGULATORY_CUSTOM_REG |
 729                                          REGULATORY_STRICT_REG |
 730                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 731                                          REGULATORY_COUNTRY_IE_IGNORE))))
 732                 return -EINVAL;
 733
 734         if (WARN_ON(wiphy->coalesce &&
 735                     (!wiphy->coalesce->n_rules ||
 736                      !wiphy->coalesce->n_patterns) &&
 737                     (!wiphy->coalesce->pattern_min_len ||
 738                      wiphy->coalesce->pattern_min_len >
 739                         wiphy->coalesce->pattern_max_len)))
 740                 return -EINVAL;
 741
 742         if (WARN_ON(wiphy->ap_sme_capa &&
 743                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 744                 return -EINVAL;
 745
 746         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 747                 return -EINVAL;
 748
 749         if (WARN_ON(wiphy->addresses &&
 750                     !is_zero_ether_addr(wiphy->perm_addr) &&
 751                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 752                            ETH_ALEN)))
 753                 return -EINVAL;
 754
 755         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 756                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 757                      !rdev->ops->set_mac_acl)))
 758                 return -EINVAL;
 759
 760         /* assure only valid behaviours are flagged by driver
 761          * hence subtract 2 as bit 0 is invalid.
 762          */
 763         if (WARN_ON(wiphy->bss_select_support &&
 764                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 765                 return -EINVAL;
 766
 767         if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
 768                                             NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
 769                     (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
 770                 return -EINVAL;
 771
 772         if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
 773                     rdev->ops->update_connect_params))
 774                 return -EINVAL;
 775
 776         if (wiphy->addresses)
 777                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 778
 779         /* sanity check ifmodes */
 780         WARN_ON(!ifmodes);
 781         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 782         if (WARN_ON(ifmodes != wiphy->interface_modes))
 783                 wiphy->interface_modes = ifmodes;
 784
 785         res = wiphy_verify_combinations(wiphy);
 786         if (res)
 787                 return res;
 788
 789         /* sanity check supported bands/channels */
 790         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 791                 u16 types = 0;
 792
 793                 sband = wiphy->bands[band];
 794                 if (!sband)
 795                         continue;
 796
 797                 sband->band = band;
 798                 if (WARN_ON(!sband->n_channels))
 799                         return -EINVAL;
 800                 /*
 801                  * on 60GHz band, there are no legacy rates, so
 802                  * n_bitrates is 0
 803                  */
 804                 if (WARN_ON(band != NL80211_BAND_60GHZ &&
 805                             !sband->n_bitrates))
 806                         return -EINVAL;
 807
 808                 /*
 809                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 810                  * modify the sband's ht data even if the driver uses a
 811                  * global structure for that.
 812                  */
 813                 if (cfg80211_disable_40mhz_24ghz &&
 814                     band == NL80211_BAND_2GHZ &&
 815                     sband->ht_cap.ht_supported) {
 816                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 817                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 818                 }
 819
 820                 /*
 821                  * Since we use a u32 for rate bitmaps in
 822                  * ieee80211_get_response_rate, we cannot
 823                  * have more than 32 legacy rates.
 824                  */
 825                 if (WARN_ON(sband->n_bitrates > 32))
 826                         return -EINVAL;
 827
 828                 for (i = 0; i < sband->n_channels; i++) {
 829                         sband->channels[i].orig_flags =
 830                                 sband->channels[i].flags;
 831                         sband->channels[i].orig_mag = INT_MAX;
 832                         sband->channels[i].orig_mpwr =
 833                                 sband->channels[i].max_power;
 834                         sband->channels[i].band = band;
 835                 }
 836
 837                 for (i = 0; i < sband->n_iftype_data; i++) {
 838                         const struct ieee80211_sband_iftype_data *iftd;
 839
 840                         iftd = &sband->iftype_data[i];
 841
 842                         if (WARN_ON(!iftd->types_mask))
 843                                 return -EINVAL;
 844                         if (WARN_ON(types & iftd->types_mask))
 845                                 return -EINVAL;
 846
 847                         /* at least one piece of information must be present */
 848                         if (WARN_ON(!iftd->he_cap.has_he))
 849                                 return -EINVAL;
 850
 851                         types |= iftd->types_mask;
 852                 }
 853
 854                 have_band = true;
 855         }
 856
 857         if (!have_band) {
 858                 WARN_ON(1);
 859                 return -EINVAL;
 860         }
 861
 862         for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
 863                 /*
 864                  * Validate we have a policy (can be explicitly set to
 865                  * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
 866                  * we have at least one of doit/dumpit.
 867                  */
 868                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
 869                         return -EINVAL;
 870                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
 871                             !rdev->wiphy.vendor_commands[i].dumpit))
 872                         return -EINVAL;
 873         }
 874
 875 #ifdef CONFIG_PM
 876         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 877                     (!rdev->wiphy.wowlan->pattern_min_len ||
 878                      rdev->wiphy.wowlan->pattern_min_len >
 879                                 rdev->wiphy.wowlan->pattern_max_len)))
 880                 return -EINVAL;
 881 #endif
 882
 883         /* check and set up bitrates */
 884         ieee80211_set_bitrate_flags(wiphy);
 885
 886         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 887
 888         rtnl_lock();
 889         res = device_add(&rdev->wiphy.dev);
 890         if (res) {
 891                 rtnl_unlock();
 892                 return res;
 893         }
 894
 895         /* set up regulatory info */
 896         wiphy_regulatory_register(wiphy);
 897
 898         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 899         cfg80211_rdev_list_generation++;
 900
 901         /* add to debugfs */
 902         rdev->wiphy.debugfsdir =
 903                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 904                                    ieee80211_debugfs_dir);
 905         if (IS_ERR(rdev->wiphy.debugfsdir))
 906                 rdev->wiphy.debugfsdir = NULL;
 907
 908         cfg80211_debugfs_rdev_add(rdev);
 909         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 910
 911         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 912                 struct regulatory_request request;
 913
 914                 request.wiphy_idx = get_wiphy_idx(wiphy);
 915                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 916                 request.alpha2[0] = '9';
 917                 request.alpha2[1] = '9';
 918
 919                 nl80211_send_reg_change_event(&request);
 920         }
 921
 922         /* Check that nobody globally advertises any capabilities they do not
 923          * advertise on all possible interface types.
 924          */
 925         if (wiphy->extended_capabilities_len &&
 926             wiphy->num_iftype_ext_capab &&
 927             wiphy->iftype_ext_capab) {
 928                 u8 supported_on_all, j;
 929                 const struct wiphy_iftype_ext_capab *capab;
 930
 931                 capab = wiphy->iftype_ext_capab;
 932                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
 933                         if (capab[0].extended_capabilities_len > j)
 934                                 supported_on_all =
 935                                         capab[0].extended_capabilities[j];
 936                         else
 937                                 supported_on_all = 0x00;
 938                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
 939                                 if (j >= capab[i].extended_capabilities_len) {
 940                                         supported_on_all = 0x00;
 941                                         break;
 942                                 }
 943                                 supported_on_all &=
 944                                         capab[i].extended_capabilities[j];
 945                         }
 946                         if (WARN_ON(wiphy->extended_capabilities[j] &
 947                                     ~supported_on_all))
 948                                 break;
 949                 }
 950         }
 951
 952         rdev->wiphy.registered = true;
 953         rtnl_unlock();
 954
 955         res = rfkill_register(rdev->rfkill);
 956         if (res) {
 957                 rfkill_destroy(rdev->rfkill);
 958                 rdev->rfkill = NULL;
 959                 wiphy_unregister(&rdev->wiphy);
 960                 return res;
 961         }
 962
 963         return 0;
 964 }
 965 EXPORT_SYMBOL(wiphy_register);
 966
 967 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 968 {
 969         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 970
 971         if (!rdev->ops->rfkill_poll)
 972                 return;
 973         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 974         rfkill_resume_polling(rdev->rfkill);
 975 }
 976 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 977
 978 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 979 {
 980         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 981
 982         rfkill_pause_polling(rdev->rfkill);
 983 }
 984 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 985
 986 void wiphy_unregister(struct wiphy *wiphy)
 987 {
 988         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 989
 990         wait_event(rdev->dev_wait, ({
 991                 int __count;
 992                 rtnl_lock();
 993                 __count = rdev->opencount;
 994                 rtnl_unlock();
 995                 __count == 0; }));
 996
 997         if (rdev->rfkill)
 998                 rfkill_unregister(rdev->rfkill);
 999
1000         rtnl_lock();
1001         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1002         rdev->wiphy.registered = false;
1003
1004         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1005
1006         /*
1007          * First remove the hardware from everywhere, this makes
1008          * it impossible to find from userspace.
1009          */
1010         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1011         list_del_rcu(&rdev->list);
1012         synchronize_rcu();
1013
1014         /*
1015          * If this device got a regulatory hint tell core its
1016          * free to listen now to a new shiny device regulatory hint
1017          */
1018         wiphy_regulatory_deregister(wiphy);
1019
1020         cfg80211_rdev_list_generation++;
1021         device_del(&rdev->wiphy.dev);
1022
1023         rtnl_unlock();
1024
1025         flush_work(&rdev->scan_done_wk);
1026         cancel_work_sync(&rdev->conn_work);
1027         flush_work(&rdev->event_work);
1028         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1029         flush_work(&rdev->destroy_work);
1030         flush_work(&rdev->sched_scan_stop_wk);
1031         flush_work(&rdev->mlme_unreg_wk);
1032         flush_work(&rdev->propagate_radar_detect_wk);
1033         flush_work(&rdev->propagate_cac_done_wk);
1034
1035 #ifdef CONFIG_PM
1036         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1037                 rdev_set_wakeup(rdev, false);
1038 #endif
1039         cfg80211_rdev_free_wowlan(rdev);
1040         cfg80211_rdev_free_coalesce(rdev);
1041 }
1042 EXPORT_SYMBOL(wiphy_unregister);
1043
1044 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1045 {
1046         struct cfg80211_internal_bss *scan, *tmp;
1047         struct cfg80211_beacon_registration *reg, *treg;
1048         rfkill_destroy(rdev->rfkill);
1049         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1050                 list_del(&reg->list);
1051                 kfree(reg);
1052         }
1053         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1054                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1055         kfree(rdev);
1056 }
1057
1058 void wiphy_free(struct wiphy *wiphy)
1059 {
1060         put_device(&wiphy->dev);
1061 }
1062 EXPORT_SYMBOL(wiphy_free);
1063
1064 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
1065 {
1066         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1067
1068         if (rfkill_set_hw_state(rdev->rfkill, blocked))
1069                 schedule_work(&rdev->rfkill_sync);
1070 }
1071 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
1072
1073 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1074 {
1075         kfree(wdev->cqm_config);
1076         wdev->cqm_config = NULL;
1077 }
1078
1079 static void __cfg80211_unregister_wdev(struct wireless_dev *wdev, bool sync)
1080 {
1081         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1082
1083         ASSERT_RTNL();
1084
1085         flush_work(&wdev->pmsr_free_wk);
1086
1087         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1088
1089         list_del_rcu(&wdev->list);
1090         if (sync)
1091                 synchronize_rcu();
1092         rdev->devlist_generation++;
1093
1094         cfg80211_mlme_purge_registrations(wdev);
1095
1096         switch (wdev->iftype) {
1097         case NL80211_IFTYPE_P2P_DEVICE:
1098                 cfg80211_stop_p2p_device(rdev, wdev);
1099                 break;
1100         case NL80211_IFTYPE_NAN:
1101                 cfg80211_stop_nan(rdev, wdev);
1102                 break;
1103         default:
1104                 break;
1105         }
1106
1107 #ifdef CONFIG_CFG80211_WEXT
1108         kzfree(wdev->wext.keys);
1109 #endif
1110         /* only initialized if we have a netdev */
1111         if (wdev->netdev)
1112                 flush_work(&wdev->disconnect_wk);
1113
1114         cfg80211_cqm_config_free(wdev);
1115 }
1116
1117 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1118 {
1119         if (WARN_ON(wdev->netdev))
1120                 return;
1121
1122         __cfg80211_unregister_wdev(wdev, true);
1123 }
1124 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1125
1126 static const struct device_type wiphy_type = {
1127         .name   = "wlan",
1128 };
1129
1130 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1131                                enum nl80211_iftype iftype, int num)
1132 {
1133         ASSERT_RTNL();
1134
1135         rdev->num_running_ifaces += num;
1136         if (iftype == NL80211_IFTYPE_MONITOR)
1137                 rdev->num_running_monitor_ifaces += num;
1138 }
1139
1140 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1141                       struct wireless_dev *wdev)
1142 {
1143         struct net_device *dev = wdev->netdev;
1144         struct cfg80211_sched_scan_request *pos, *tmp;
1145
1146         ASSERT_RTNL();
1147         ASSERT_WDEV_LOCK(wdev);
1148
1149         cfg80211_pmsr_wdev_down(wdev);
1150
1151         switch (wdev->iftype) {
1152         case NL80211_IFTYPE_ADHOC:
1153                 __cfg80211_leave_ibss(rdev, dev, true);
1154                 break;
1155         case NL80211_IFTYPE_P2P_CLIENT:
1156         case NL80211_IFTYPE_STATION:
1157                 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1158                                          list) {
1159                         if (dev == pos->dev)
1160                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1161                 }
1162
1163 #ifdef CONFIG_CFG80211_WEXT
1164                 kfree(wdev->wext.ie);
1165                 wdev->wext.ie = NULL;
1166                 wdev->wext.ie_len = 0;
1167                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1168 #endif
1169                 cfg80211_disconnect(rdev, dev,
1170                                     WLAN_REASON_DEAUTH_LEAVING, true);
1171                 break;
1172         case NL80211_IFTYPE_MESH_POINT:
1173                 __cfg80211_leave_mesh(rdev, dev);
1174                 break;
1175         case NL80211_IFTYPE_AP:
1176         case NL80211_IFTYPE_P2P_GO:
1177                 __cfg80211_stop_ap(rdev, dev, true);
1178                 break;
1179         case NL80211_IFTYPE_OCB:
1180                 __cfg80211_leave_ocb(rdev, dev);
1181                 break;
1182         case NL80211_IFTYPE_WDS:
1183                 /* must be handled by mac80211/driver, has no APIs */
1184                 break;
1185         case NL80211_IFTYPE_P2P_DEVICE:
1186         case NL80211_IFTYPE_NAN:
1187                 /* cannot happen, has no netdev */
1188                 break;
1189         case NL80211_IFTYPE_AP_VLAN:
1190         case NL80211_IFTYPE_MONITOR:
1191                 /* nothing to do */
1192                 break;
1193         case NL80211_IFTYPE_UNSPECIFIED:
1194         case NUM_NL80211_IFTYPES:
1195                 /* invalid */
1196                 break;
1197         }
1198 }
1199
1200 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1201                     struct wireless_dev *wdev)
1202 {
1203         wdev_lock(wdev);
1204         __cfg80211_leave(rdev, wdev);
1205         wdev_unlock(wdev);
1206 }
1207
1208 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1209                          gfp_t gfp)
1210 {
1211         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1212         struct cfg80211_event *ev;
1213         unsigned long flags;
1214
1215         trace_cfg80211_stop_iface(wiphy, wdev);
1216
1217         ev = kzalloc(sizeof(*ev), gfp);
1218         if (!ev)
1219                 return;
1220
1221         ev->type = EVENT_STOPPED;
1222
1223         spin_lock_irqsave(&wdev->event_lock, flags);
1224         list_add_tail(&ev->list, &wdev->event_list);
1225         spin_unlock_irqrestore(&wdev->event_lock, flags);
1226         queue_work(cfg80211_wq, &rdev->event_work);
1227 }
1228 EXPORT_SYMBOL(cfg80211_stop_iface);
1229
1230 void cfg80211_init_wdev(struct cfg80211_registered_device *rdev,
1231                         struct wireless_dev *wdev)
1232 {
1233         mutex_init(&wdev->mtx);
1234         INIT_LIST_HEAD(&wdev->event_list);
1235         spin_lock_init(&wdev->event_lock);
1236         INIT_LIST_HEAD(&wdev->mgmt_registrations);
1237         spin_lock_init(&wdev->mgmt_registrations_lock);
1238         INIT_LIST_HEAD(&wdev->pmsr_list);
1239         spin_lock_init(&wdev->pmsr_lock);
1240         INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1241
1242         /*
1243          * We get here also when the interface changes network namespaces,
1244          * as it's registered into the new one, but we don't want it to
1245          * change ID in that case. Checking if the ID is already assigned
1246          * works, because 0 isn't considered a valid ID and the memory is
1247          * 0-initialized.
1248          */
1249         if (!wdev->identifier)
1250                 wdev->identifier = ++rdev->wdev_id;
1251         list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1252         rdev->devlist_generation++;
1253
1254         nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1255 }
1256
1257 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1258                                          unsigned long state, void *ptr)
1259 {
1260         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1261         struct wireless_dev *wdev = dev->ieee80211_ptr;
1262         struct cfg80211_registered_device *rdev;
1263         struct cfg80211_sched_scan_request *pos, *tmp;
1264
1265         if (!wdev)
1266                 return NOTIFY_DONE;
1267
1268         rdev = wiphy_to_rdev(wdev->wiphy);
1269
1270         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1271
1272         switch (state) {
1273         case NETDEV_POST_INIT:
1274                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1275                 break;
1276         case NETDEV_REGISTER:
1277                 /*
1278                  * NB: cannot take rdev->mtx here because this may be
1279                  * called within code protected by it when interfaces
1280                  * are added with nl80211.
1281                  */
1282                 /* can only change netns with wiphy */
1283                 dev->features |= NETIF_F_NETNS_LOCAL;
1284
1285                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1286                                       "phy80211")) {
1287                         pr_err("failed to add phy80211 symlink to netdev!\n");
1288                 }
1289                 wdev->netdev = dev;
1290 #ifdef CONFIG_CFG80211_WEXT
1291                 wdev->wext.default_key = -1;
1292                 wdev->wext.default_mgmt_key = -1;
1293                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1294 #endif
1295
1296                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1297                         wdev->ps = true;
1298                 else
1299                         wdev->ps = false;
1300                 /* allow mac80211 to determine the timeout */
1301                 wdev->ps_timeout = -1;
1302
1303                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1304                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1305                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1306                         dev->priv_flags |= IFF_DONT_BRIDGE;
1307
1308                 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1309
1310                 cfg80211_init_wdev(rdev, wdev);
1311                 break;
1312         case NETDEV_GOING_DOWN:
1313                 cfg80211_leave(rdev, wdev);
1314                 break;
1315         case NETDEV_DOWN:
1316                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1317                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1318                         if (WARN_ON(!rdev->scan_req->notified))
1319                                 rdev->scan_req->info.aborted = true;
1320                         ___cfg80211_scan_done(rdev, false);
1321                 }
1322
1323                 list_for_each_entry_safe(pos, tmp,
1324                                          &rdev->sched_scan_req_list, list) {
1325                         if (WARN_ON(pos->dev == wdev->netdev))
1326                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1327                 }
1328
1329                 rdev->opencount--;
1330                 wake_up(&rdev->dev_wait);
1331                 break;
1332         case NETDEV_UP:
1333                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1334                 wdev_lock(wdev);
1335                 switch (wdev->iftype) {
1336 #ifdef CONFIG_CFG80211_WEXT
1337                 case NL80211_IFTYPE_ADHOC:
1338                         cfg80211_ibss_wext_join(rdev, wdev);
1339                         break;
1340                 case NL80211_IFTYPE_STATION:
1341                         cfg80211_mgd_wext_connect(rdev, wdev);
1342                         break;
1343 #endif
1344 #ifdef CONFIG_MAC80211_MESH
1345                 case NL80211_IFTYPE_MESH_POINT:
1346                         {
1347                                 /* backward compat code... */
1348                                 struct mesh_setup setup;
1349                                 memcpy(&setup, &default_mesh_setup,
1350                                                 sizeof(setup));
1351                                  /* back compat only needed for mesh_id */
1352                                 setup.mesh_id = wdev->ssid;
1353                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1354                                 if (wdev->mesh_id_up_len)
1355                                         __cfg80211_join_mesh(rdev, dev,
1356                                                         &setup,
1357                                                         &default_mesh_config);
1358                                 break;
1359                         }
1360 #endif
1361                 default:
1362                         break;
1363                 }
1364                 wdev_unlock(wdev);
1365                 rdev->opencount++;
1366
1367                 /*
1368                  * Configure power management to the driver here so that its
1369                  * correctly set also after interface type changes etc.
1370                  */
1371                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1372                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1373                     rdev->ops->set_power_mgmt &&
1374                     rdev_set_power_mgmt(rdev, dev, wdev->ps,
1375                                         wdev->ps_timeout)) {
1376                         /* assume this means it's off */
1377                         wdev->ps = false;
1378                 }
1379                 break;
1380         case NETDEV_UNREGISTER:
1381                 /*
1382                  * It is possible to get NETDEV_UNREGISTER
1383                  * multiple times. To detect that, check
1384                  * that the interface is still on the list
1385                  * of registered interfaces, and only then
1386                  * remove and clean it up.
1387                  */
1388                 if (!list_empty(&wdev->list)) {
1389                         __cfg80211_unregister_wdev(wdev, false);
1390                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1391                 }
1392                 /*
1393                  * synchronise (so that we won't find this netdev
1394                  * from other code any more) and then clear the list
1395                  * head so that the above code can safely check for
1396                  * !list_empty() to avoid double-cleanup.
1397                  */
1398                 synchronize_rcu();
1399                 INIT_LIST_HEAD(&wdev->list);
1400                 /*
1401                  * Ensure that all events have been processed and
1402                  * freed.
1403                  */
1404                 cfg80211_process_wdev_events(wdev);
1405
1406                 if (WARN_ON(wdev->current_bss)) {
1407                         cfg80211_unhold_bss(wdev->current_bss);
1408                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1409                         wdev->current_bss = NULL;
1410                 }
1411                 break;
1412         case NETDEV_PRE_UP:
1413                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)) &&
1414                     !(wdev->iftype == NL80211_IFTYPE_AP_VLAN &&
1415                       rdev->wiphy.flags & WIPHY_FLAG_4ADDR_AP &&
1416                       wdev->use_4addr))
1417                         return notifier_from_errno(-EOPNOTSUPP);
1418
1419                 if (rfkill_blocked(rdev->rfkill))
1420                         return notifier_from_errno(-ERFKILL);
1421                 break;
1422         default:
1423                 return NOTIFY_DONE;
1424         }
1425
1426         wireless_nlevent_flush();
1427
1428         return NOTIFY_OK;
1429 }
1430
1431 static struct notifier_block cfg80211_netdev_notifier = {
1432         .notifier_call = cfg80211_netdev_notifier_call,
1433 };
1434
1435 static void __net_exit cfg80211_pernet_exit(struct net *net)
1436 {
1437         struct cfg80211_registered_device *rdev;
1438
1439         rtnl_lock();
1440         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1441                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1442                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1443         }
1444         rtnl_unlock();
1445 }
1446
1447 static struct pernet_operations cfg80211_pernet_ops = {
1448         .exit = cfg80211_pernet_exit,
1449 };
1450
1451 static int __init cfg80211_init(void)
1452 {
1453         int err;
1454
1455         err = register_pernet_device(&cfg80211_pernet_ops);
1456         if (err)
1457                 goto out_fail_pernet;
1458
1459         err = wiphy_sysfs_init();
1460         if (err)
1461                 goto out_fail_sysfs;
1462
1463         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1464         if (err)
1465                 goto out_fail_notifier;
1466
1467         err = nl80211_init();
1468         if (err)
1469                 goto out_fail_nl80211;
1470
1471         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1472
1473         err = regulatory_init();
1474         if (err)
1475                 goto out_fail_reg;
1476
1477         cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1478         if (!cfg80211_wq) {
1479                 err = -ENOMEM;
1480                 goto out_fail_wq;
1481         }
1482
1483         return 0;
1484
1485 out_fail_wq:
1486         regulatory_exit();
1487 out_fail_reg:
1488         debugfs_remove(ieee80211_debugfs_dir);
1489         nl80211_exit();
1490 out_fail_nl80211:
1491         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1492 out_fail_notifier:
1493         wiphy_sysfs_exit();
1494 out_fail_sysfs:
1495         unregister_pernet_device(&cfg80211_pernet_ops);
1496 out_fail_pernet:
1497         return err;
1498 }
1499 fs_initcall(cfg80211_init);
1500
1501 static void __exit cfg80211_exit(void)
1502 {
1503         debugfs_remove(ieee80211_debugfs_dir);
1504         nl80211_exit();
1505         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1506         wiphy_sysfs_exit();
1507         regulatory_exit();
1508         unregister_pernet_device(&cfg80211_pernet_ops);
1509         destroy_workqueue(cfg80211_wq);
1510 }
1511 module_exit(cfg80211_exit);