net/wireless/core.c

   1 /*
   2  * This is the linux wireless configuration interface.
   3  *
   4  * Copyright 2006-2010          Johannes Berg <johannes@sipsolutions.net>
   5  * Copyright 2013-2014  Intel Mobile Communications GmbH
   6  * Copyright 2015-2017  Intel Deutschland GmbH
   7  * Copyright (C) 2018 Intel Corporation
   8  */
   9
  10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11
  12 #include <linux/if.h>
  13 #include <linux/module.h>
  14 #include <linux/err.h>
  15 #include <linux/list.h>
  16 #include <linux/slab.h>
  17 #include <linux/nl80211.h>
  18 #include <linux/debugfs.h>
  19 #include <linux/notifier.h>
  20 #include <linux/device.h>
  21 #include <linux/etherdevice.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/sched.h>
  24 #include <net/genetlink.h>
  25 #include <net/cfg80211.h>
  26 #include "nl80211.h"
  27 #include "core.h"
  28 #include "sysfs.h"
  29 #include "debugfs.h"
  30 #include "wext-compat.h"
  31 #include "rdev-ops.h"
  32
  33 /* name for sysfs, %d is appended */
  34 #define PHY_NAME "phy"
  35
  36 MODULE_AUTHOR("Johannes Berg");
  37 MODULE_LICENSE("GPL");
  38 MODULE_DESCRIPTION("wireless configuration support");
  39 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
  40
  41 /* RCU-protected (and RTNL for writers) */
  42 LIST_HEAD(cfg80211_rdev_list);
  43 int cfg80211_rdev_list_generation;
  44
  45 /* for debugfs */
  46 static struct dentry *ieee80211_debugfs_dir;
  47
  48 /* for the cleanup, scan and event works */
  49 struct workqueue_struct *cfg80211_wq;
  50
  51 static bool cfg80211_disable_40mhz_24ghz;
  52 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  53 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  54                  "Disable 40MHz support in the 2.4GHz band");
  55
  56 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  57 {
  58         struct cfg80211_registered_device *result = NULL, *rdev;
  59
  60         ASSERT_RTNL();
  61
  62         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  63                 if (rdev->wiphy_idx == wiphy_idx) {
  64                         result = rdev;
  65                         break;
  66                 }
  67         }
  68
  69         return result;
  70 }
  71
  72 int get_wiphy_idx(struct wiphy *wiphy)
  73 {
  74         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
  75
  76         return rdev->wiphy_idx;
  77 }
  78
  79 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  80 {
  81         struct cfg80211_registered_device *rdev;
  82
  83         ASSERT_RTNL();
  84
  85         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  86         if (!rdev)
  87                 return NULL;
  88         return &rdev->wiphy;
  89 }
  90
  91 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
  92                                    const char *newname)
  93 {
  94         struct cfg80211_registered_device *rdev2;
  95         int wiphy_idx, taken = -1, digits;
  96
  97         ASSERT_RTNL();
  98
  99         if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
 100                 return -EINVAL;
 101
 102         /* prohibit calling the thing phy%d when %d is not its number */
 103         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 104         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 105                 /* count number of places needed to print wiphy_idx */
 106                 digits = 1;
 107                 while (wiphy_idx /= 10)
 108                         digits++;
 109                 /*
 110                  * deny the name if it is phy<idx> where <idx> is printed
 111                  * without leading zeroes. taken == strlen(newname) here
 112                  */
 113                 if (taken == strlen(PHY_NAME) + digits)
 114                         return -EINVAL;
 115         }
 116
 117         /* Ensure another device does not already have this name. */
 118         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 119                 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
 120                         return -EINVAL;
 121
 122         return 0;
 123 }
 124
 125 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 126                         char *newname)
 127 {
 128         int result;
 129
 130         ASSERT_RTNL();
 131
 132         /* Ignore nop renames */
 133         if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
 134                 return 0;
 135
 136         result = cfg80211_dev_check_name(rdev, newname);
 137         if (result < 0)
 138                 return result;
 139
 140         result = device_rename(&rdev->wiphy.dev, newname);
 141         if (result)
 142                 return result;
 143
 144         if (rdev->wiphy.debugfsdir &&
 145             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 146                             rdev->wiphy.debugfsdir,
 147                             rdev->wiphy.debugfsdir->d_parent,
 148                             newname))
 149                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 150
 151         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 152
 153         return 0;
 154 }
 155
 156 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 157                           struct net *net)
 158 {
 159         struct wireless_dev *wdev;
 160         int err = 0;
 161
 162         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 163                 return -EOPNOTSUPP;
 164
 165         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 166                 if (!wdev->netdev)
 167                         continue;
 168                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 169                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 170                 if (err)
 171                         break;
 172                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 173         }
 174
 175         if (err) {
 176                 /* failed -- clean up to old netns */
 177                 net = wiphy_net(&rdev->wiphy);
 178
 179                 list_for_each_entry_continue_reverse(wdev,
 180                                                      &rdev->wiphy.wdev_list,
 181                                                      list) {
 182                         if (!wdev->netdev)
 183                                 continue;
 184                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 185                         err = dev_change_net_namespace(wdev->netdev, net,
 186                                                         "wlan%d");
 187                         WARN_ON(err);
 188                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 189                 }
 190
 191                 return err;
 192         }
 193
 194         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 195                 if (!wdev->netdev)
 196                         continue;
 197                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
 198         }
 199         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 200
 201         wiphy_net_set(&rdev->wiphy, net);
 202
 203         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 204         WARN_ON(err);
 205
 206         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 207         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 208                 if (!wdev->netdev)
 209                         continue;
 210                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
 211         }
 212
 213         return 0;
 214 }
 215
 216 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 217 {
 218         struct cfg80211_registered_device *rdev = data;
 219
 220         rdev_rfkill_poll(rdev);
 221 }
 222
 223 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 224                               struct wireless_dev *wdev)
 225 {
 226         ASSERT_RTNL();
 227
 228         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 229                 return;
 230
 231         if (!wdev_running(wdev))
 232                 return;
 233
 234         rdev_stop_p2p_device(rdev, wdev);
 235         wdev->is_running = false;
 236
 237         rdev->opencount--;
 238
 239         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 240                 if (WARN_ON(!rdev->scan_req->notified))
 241                         rdev->scan_req->info.aborted = true;
 242                 ___cfg80211_scan_done(rdev, false);
 243         }
 244 }
 245
 246 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
 247                        struct wireless_dev *wdev)
 248 {
 249         ASSERT_RTNL();
 250
 251         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
 252                 return;
 253
 254         if (!wdev_running(wdev))
 255                 return;
 256
 257         rdev_stop_nan(rdev, wdev);
 258         wdev->is_running = false;
 259
 260         rdev->opencount--;
 261 }
 262
 263 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 264 {
 265         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 266         struct wireless_dev *wdev;
 267
 268         ASSERT_RTNL();
 269
 270         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 271                 if (wdev->netdev) {
 272                         dev_close(wdev->netdev);
 273                         continue;
 274                 }
 275                 /* otherwise, check iftype */
 276                 switch (wdev->iftype) {
 277                 case NL80211_IFTYPE_P2P_DEVICE:
 278                         cfg80211_stop_p2p_device(rdev, wdev);
 279                         break;
 280                 case NL80211_IFTYPE_NAN:
 281                         cfg80211_stop_nan(rdev, wdev);
 282                         break;
 283                 default:
 284                         break;
 285                 }
 286         }
 287 }
 288 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 289
 290 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 291 {
 292         struct cfg80211_registered_device *rdev = data;
 293
 294         if (!blocked)
 295                 return 0;
 296
 297         rtnl_lock();
 298         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 299         rtnl_unlock();
 300
 301         return 0;
 302 }
 303
 304 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 305 {
 306         struct cfg80211_registered_device *rdev;
 307
 308         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 309         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 310 }
 311
 312 static void cfg80211_event_work(struct work_struct *work)
 313 {
 314         struct cfg80211_registered_device *rdev;
 315
 316         rdev = container_of(work, struct cfg80211_registered_device,
 317                             event_work);
 318
 319         rtnl_lock();
 320         cfg80211_process_rdev_events(rdev);
 321         rtnl_unlock();
 322 }
 323
 324 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 325 {
 326         struct wireless_dev *wdev, *tmp;
 327
 328         ASSERT_RTNL();
 329
 330         list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
 331                 if (wdev->nl_owner_dead)
 332                         rdev_del_virtual_intf(rdev, wdev);
 333         }
 334 }
 335
 336 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 337 {
 338         struct cfg80211_registered_device *rdev;
 339
 340         rdev = container_of(work, struct cfg80211_registered_device,
 341                             destroy_work);
 342
 343         rtnl_lock();
 344         cfg80211_destroy_ifaces(rdev);
 345         rtnl_unlock();
 346 }
 347
 348 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
 349 {
 350         struct cfg80211_registered_device *rdev;
 351         struct cfg80211_sched_scan_request *req, *tmp;
 352
 353         rdev = container_of(work, struct cfg80211_registered_device,
 354                            sched_scan_stop_wk);
 355
 356         rtnl_lock();
 357         list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
 358                 if (req->nl_owner_dead)
 359                         cfg80211_stop_sched_scan_req(rdev, req, false);
 360         }
 361         rtnl_unlock();
 362 }
 363
 364 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
 365 {
 366         struct cfg80211_registered_device *rdev;
 367
 368         rdev = container_of(work, struct cfg80211_registered_device,
 369                             propagate_radar_detect_wk);
 370
 371         rtnl_lock();
 372
 373         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
 374                                        NL80211_DFS_UNAVAILABLE,
 375                                        NL80211_RADAR_DETECTED);
 376
 377         rtnl_unlock();
 378 }
 379
 380 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
 381 {
 382         struct cfg80211_registered_device *rdev;
 383
 384         rdev = container_of(work, struct cfg80211_registered_device,
 385                             propagate_cac_done_wk);
 386
 387         rtnl_lock();
 388
 389         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
 390                                        NL80211_DFS_AVAILABLE,
 391                                        NL80211_RADAR_CAC_FINISHED);
 392
 393         rtnl_unlock();
 394 }
 395
 396 /* exported functions */
 397
 398 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 399                            const char *requested_name)
 400 {
 401         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 402
 403         struct cfg80211_registered_device *rdev;
 404         int alloc_size;
 405
 406         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 407         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 408         WARN_ON(ops->connect && !ops->disconnect);
 409         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 410         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 411         WARN_ON(ops->add_station && !ops->del_station);
 412         WARN_ON(ops->add_mpath && !ops->del_mpath);
 413         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 414         WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
 415         WARN_ON(ops->start_ap && !ops->stop_ap);
 416         WARN_ON(ops->join_ocb && !ops->leave_ocb);
 417         WARN_ON(ops->suspend && !ops->resume);
 418         WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
 419         WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
 420         WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
 421         WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
 422
 423         alloc_size = sizeof(*rdev) + sizeof_priv;
 424
 425         rdev = kzalloc(alloc_size, GFP_KERNEL);
 426         if (!rdev)
 427                 return NULL;
 428
 429         rdev->ops = ops;
 430
 431         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 432
 433         if (unlikely(rdev->wiphy_idx < 0)) {
 434                 /* ugh, wrapped! */
 435                 atomic_dec(&wiphy_counter);
 436                 kfree(rdev);
 437                 return NULL;
 438         }
 439
 440         /* atomic_inc_return makes it start at 1, make it start at 0 */
 441         rdev->wiphy_idx--;
 442
 443         /* give it a proper name */
 444         if (requested_name && requested_name[0]) {
 445                 int rv;
 446
 447                 rtnl_lock();
 448                 rv = cfg80211_dev_check_name(rdev, requested_name);
 449
 450                 if (rv < 0) {
 451                         rtnl_unlock();
 452                         goto use_default_name;
 453                 }
 454
 455                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 456                 rtnl_unlock();
 457                 if (rv)
 458                         goto use_default_name;
 459         } else {
 460                 int rv;
 461
 462 use_default_name:
 463                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 464                  * the restrictions on phy names.  Probably this call could
 465                  * fail if some other part of the kernel (re)named a device
 466                  * phyX.  But, might should add some locking and check return
 467                  * value, and use a different name if this one exists?
 468                  */
 469                 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 470                 if (rv < 0) {
 471                         kfree(rdev);
 472                         return NULL;
 473                 }
 474         }
 475
 476         INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
 477         INIT_LIST_HEAD(&rdev->beacon_registrations);
 478         spin_lock_init(&rdev->beacon_registrations_lock);
 479         spin_lock_init(&rdev->bss_lock);
 480         INIT_LIST_HEAD(&rdev->bss_list);
 481         INIT_LIST_HEAD(&rdev->sched_scan_req_list);
 482         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 483         INIT_LIST_HEAD(&rdev->mlme_unreg);
 484         spin_lock_init(&rdev->mlme_unreg_lock);
 485         INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
 486         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 487                           cfg80211_dfs_channels_update_work);
 488 #ifdef CONFIG_CFG80211_WEXT
 489         rdev->wiphy.wext = &cfg80211_wext_handler;
 490 #endif
 491
 492         device_initialize(&rdev->wiphy.dev);
 493         rdev->wiphy.dev.class = &ieee80211_class;
 494         rdev->wiphy.dev.platform_data = rdev;
 495         device_enable_async_suspend(&rdev->wiphy.dev);
 496
 497         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 498         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 499         INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
 500         INIT_WORK(&rdev->propagate_radar_detect_wk,
 501                   cfg80211_propagate_radar_detect_wk);
 502         INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
 503
 504 #ifdef CONFIG_CFG80211_DEFAULT_PS
 505         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 506 #endif
 507
 508         wiphy_net_set(&rdev->wiphy, &init_net);
 509
 510         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 511         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 512                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 513                                    &rdev->rfkill_ops, rdev);
 514
 515         if (!rdev->rfkill) {
 516                 kfree(rdev);
 517                 return NULL;
 518         }
 519
 520         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 521         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 522         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 523
 524         init_waitqueue_head(&rdev->dev_wait);
 525
 526         /*
 527          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 528          * Fragmentation and RTS threshold are disabled by default with the
 529          * special -1 value.
 530          */
 531         rdev->wiphy.retry_short = 7;
 532         rdev->wiphy.retry_long = 4;
 533         rdev->wiphy.frag_threshold = (u32) -1;
 534         rdev->wiphy.rts_threshold = (u32) -1;
 535         rdev->wiphy.coverage_class = 0;
 536
 537         rdev->wiphy.max_num_csa_counters = 1;
 538
 539         rdev->wiphy.max_sched_scan_plans = 1;
 540         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 541
 542         return &rdev->wiphy;
 543 }
 544 EXPORT_SYMBOL(wiphy_new_nm);
 545
 546 static int wiphy_verify_combinations(struct wiphy *wiphy)
 547 {
 548         const struct ieee80211_iface_combination *c;
 549         int i, j;
 550
 551         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 552                 u32 cnt = 0;
 553                 u16 all_iftypes = 0;
 554
 555                 c = &wiphy->iface_combinations[i];
 556
 557                 /*
 558                  * Combinations with just one interface aren't real,
 559                  * however we make an exception for DFS.
 560                  */
 561                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 562                         return -EINVAL;
 563
 564                 /* Need at least one channel */
 565                 if (WARN_ON(!c->num_different_channels))
 566                         return -EINVAL;
 567
 568                 /*
 569                  * Put a sane limit on maximum number of different
 570                  * channels to simplify channel accounting code.
 571                  */
 572                 if (WARN_ON(c->num_different_channels >
 573                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 574                         return -EINVAL;
 575
 576                 /* DFS only works on one channel. */
 577                 if (WARN_ON(c->radar_detect_widths &&
 578                             (c->num_different_channels > 1)))
 579                         return -EINVAL;
 580
 581                 if (WARN_ON(!c->n_limits))
 582                         return -EINVAL;
 583
 584                 for (j = 0; j < c->n_limits; j++) {
 585                         u16 types = c->limits[j].types;
 586
 587                         /* interface types shouldn't overlap */
 588                         if (WARN_ON(types & all_iftypes))
 589                                 return -EINVAL;
 590                         all_iftypes |= types;
 591
 592                         if (WARN_ON(!c->limits[j].max))
 593                                 return -EINVAL;
 594
 595                         /* Shouldn't list software iftypes in combinations! */
 596                         if (WARN_ON(wiphy->software_iftypes & types))
 597                                 return -EINVAL;
 598
 599                         /* Only a single P2P_DEVICE can be allowed */
 600                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 601                                     c->limits[j].max > 1))
 602                                 return -EINVAL;
 603
 604                         /* Only a single NAN can be allowed */
 605                         if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
 606                                     c->limits[j].max > 1))
 607                                 return -EINVAL;
 608
 609                         /*
 610                          * This isn't well-defined right now. If you have an
 611                          * IBSS interface, then its beacon interval may change
 612                          * by joining other networks, and nothing prevents it
 613                          * from doing that.
 614                          * So technically we probably shouldn't even allow AP
 615                          * and IBSS in the same interface, but it seems that
 616                          * some drivers support that, possibly only with fixed
 617                          * beacon intervals for IBSS.
 618                          */
 619                         if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
 620                                     c->beacon_int_min_gcd)) {
 621                                 return -EINVAL;
 622                         }
 623
 624                         cnt += c->limits[j].max;
 625                         /*
 626                          * Don't advertise an unsupported type
 627                          * in a combination.
 628                          */
 629                         if (WARN_ON((wiphy->interface_modes & types) != types))
 630                                 return -EINVAL;
 631                 }
 632
 633 #ifndef CONFIG_WIRELESS_WDS
 634                 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
 635                         return -EINVAL;
 636 #endif
 637
 638                 /* You can't even choose that many! */
 639                 if (WARN_ON(cnt < c->max_interfaces))
 640                         return -EINVAL;
 641         }
 642
 643         return 0;
 644 }
 645
 646 int wiphy_register(struct wiphy *wiphy)
 647 {
 648         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 649         int res;
 650         enum nl80211_band band;
 651         struct ieee80211_supported_band *sband;
 652         bool have_band = false;
 653         int i;
 654         u16 ifmodes = wiphy->interface_modes;
 655
 656 #ifdef CONFIG_PM
 657         if (WARN_ON(wiphy->wowlan &&
 658                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 659                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 660                 return -EINVAL;
 661         if (WARN_ON(wiphy->wowlan &&
 662                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 663                     !wiphy->wowlan->tcp))
 664                 return -EINVAL;
 665 #endif
 666         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 667                     (!rdev->ops->tdls_channel_switch ||
 668                      !rdev->ops->tdls_cancel_channel_switch)))
 669                 return -EINVAL;
 670
 671         if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
 672                     (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
 673                      !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
 674                      !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
 675                 return -EINVAL;
 676
 677 #ifndef CONFIG_WIRELESS_WDS
 678         if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
 679                 return -EINVAL;
 680 #endif
 681
 682         if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
 683                 return -EINVAL;
 684
 685         if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
 686                 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
 687                             !wiphy->pmsr_capa->ftm.non_asap))
 688                         return -EINVAL;
 689                 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
 690                             !wiphy->pmsr_capa->ftm.bandwidths))
 691                         return -EINVAL;
 692                 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
 693                                 ~(BIT(NL80211_PREAMBLE_LEGACY) |
 694                                   BIT(NL80211_PREAMBLE_HT) |
 695                                   BIT(NL80211_PREAMBLE_VHT) |
 696                                   BIT(NL80211_PREAMBLE_DMG))))
 697                         return -EINVAL;
 698                 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
 699                                 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
 700                                   BIT(NL80211_CHAN_WIDTH_20) |
 701                                   BIT(NL80211_CHAN_WIDTH_40) |
 702                                   BIT(NL80211_CHAN_WIDTH_80) |
 703                                   BIT(NL80211_CHAN_WIDTH_80P80) |
 704                                   BIT(NL80211_CHAN_WIDTH_160) |
 705                                   BIT(NL80211_CHAN_WIDTH_5) |
 706                                   BIT(NL80211_CHAN_WIDTH_10))))
 707                         return -EINVAL;
 708         }
 709
 710         /*
 711          * if a wiphy has unsupported modes for regulatory channel enforcement,
 712          * opt-out of enforcement checking
 713          */
 714         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 715                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 716                                        BIT(NL80211_IFTYPE_AP) |
 717                                        BIT(NL80211_IFTYPE_P2P_GO) |
 718                                        BIT(NL80211_IFTYPE_ADHOC) |
 719                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 720                                        BIT(NL80211_IFTYPE_NAN) |
 721                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 722                                        BIT(NL80211_IFTYPE_MONITOR)))
 723                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 724
 725         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 726                     (wiphy->regulatory_flags &
 727                                         (REGULATORY_CUSTOM_REG |
 728                                          REGULATORY_STRICT_REG |
 729                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 730                                          REGULATORY_COUNTRY_IE_IGNORE))))
 731                 return -EINVAL;
 732
 733         if (WARN_ON(wiphy->coalesce &&
 734                     (!wiphy->coalesce->n_rules ||
 735                      !wiphy->coalesce->n_patterns) &&
 736                     (!wiphy->coalesce->pattern_min_len ||
 737                      wiphy->coalesce->pattern_min_len >
 738                         wiphy->coalesce->pattern_max_len)))
 739                 return -EINVAL;
 740
 741         if (WARN_ON(wiphy->ap_sme_capa &&
 742                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 743                 return -EINVAL;
 744
 745         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 746                 return -EINVAL;
 747
 748         if (WARN_ON(wiphy->addresses &&
 749                     !is_zero_ether_addr(wiphy->perm_addr) &&
 750                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 751                            ETH_ALEN)))
 752                 return -EINVAL;
 753
 754         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 755                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 756                      !rdev->ops->set_mac_acl)))
 757                 return -EINVAL;
 758
 759         /* assure only valid behaviours are flagged by driver
 760          * hence subtract 2 as bit 0 is invalid.
 761          */
 762         if (WARN_ON(wiphy->bss_select_support &&
 763                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 764                 return -EINVAL;
 765
 766         if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
 767                                             NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
 768                     (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
 769                 return -EINVAL;
 770
 771         if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
 772                     rdev->ops->update_connect_params))
 773                 return -EINVAL;
 774
 775         if (wiphy->addresses)
 776                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 777
 778         /* sanity check ifmodes */
 779         WARN_ON(!ifmodes);
 780         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 781         if (WARN_ON(ifmodes != wiphy->interface_modes))
 782                 wiphy->interface_modes = ifmodes;
 783
 784         res = wiphy_verify_combinations(wiphy);
 785         if (res)
 786                 return res;
 787
 788         /* sanity check supported bands/channels */
 789         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 790                 u16 types = 0;
 791
 792                 sband = wiphy->bands[band];
 793                 if (!sband)
 794                         continue;
 795
 796                 sband->band = band;
 797                 if (WARN_ON(!sband->n_channels))
 798                         return -EINVAL;
 799                 /*
 800                  * on 60GHz band, there are no legacy rates, so
 801                  * n_bitrates is 0
 802                  */
 803                 if (WARN_ON(band != NL80211_BAND_60GHZ &&
 804                             !sband->n_bitrates))
 805                         return -EINVAL;
 806
 807                 /*
 808                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 809                  * modify the sband's ht data even if the driver uses a
 810                  * global structure for that.
 811                  */
 812                 if (cfg80211_disable_40mhz_24ghz &&
 813                     band == NL80211_BAND_2GHZ &&
 814                     sband->ht_cap.ht_supported) {
 815                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 816                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 817                 }
 818
 819                 /*
 820                  * Since we use a u32 for rate bitmaps in
 821                  * ieee80211_get_response_rate, we cannot
 822                  * have more than 32 legacy rates.
 823                  */
 824                 if (WARN_ON(sband->n_bitrates > 32))
 825                         return -EINVAL;
 826
 827                 for (i = 0; i < sband->n_channels; i++) {
 828                         sband->channels[i].orig_flags =
 829                                 sband->channels[i].flags;
 830                         sband->channels[i].orig_mag = INT_MAX;
 831                         sband->channels[i].orig_mpwr =
 832                                 sband->channels[i].max_power;
 833                         sband->channels[i].band = band;
 834                 }
 835
 836                 for (i = 0; i < sband->n_iftype_data; i++) {
 837                         const struct ieee80211_sband_iftype_data *iftd;
 838
 839                         iftd = &sband->iftype_data[i];
 840
 841                         if (WARN_ON(!iftd->types_mask))
 842                                 return -EINVAL;
 843                         if (WARN_ON(types & iftd->types_mask))
 844                                 return -EINVAL;
 845
 846                         /* at least one piece of information must be present */
 847                         if (WARN_ON(!iftd->he_cap.has_he))
 848                                 return -EINVAL;
 849
 850                         types |= iftd->types_mask;
 851                 }
 852
 853                 have_band = true;
 854         }
 855
 856         if (!have_band) {
 857                 WARN_ON(1);
 858                 return -EINVAL;
 859         }
 860
 861 #ifdef CONFIG_PM
 862         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 863                     (!rdev->wiphy.wowlan->pattern_min_len ||
 864                      rdev->wiphy.wowlan->pattern_min_len >
 865                                 rdev->wiphy.wowlan->pattern_max_len)))
 866                 return -EINVAL;
 867 #endif
 868
 869         /* check and set up bitrates */
 870         ieee80211_set_bitrate_flags(wiphy);
 871
 872         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 873
 874         rtnl_lock();
 875         res = device_add(&rdev->wiphy.dev);
 876         if (res) {
 877                 rtnl_unlock();
 878                 return res;
 879         }
 880
 881         /* set up regulatory info */
 882         wiphy_regulatory_register(wiphy);
 883
 884         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 885         cfg80211_rdev_list_generation++;
 886
 887         /* add to debugfs */
 888         rdev->wiphy.debugfsdir =
 889                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 890                                    ieee80211_debugfs_dir);
 891         if (IS_ERR(rdev->wiphy.debugfsdir))
 892                 rdev->wiphy.debugfsdir = NULL;
 893
 894         cfg80211_debugfs_rdev_add(rdev);
 895         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 896
 897         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 898                 struct regulatory_request request;
 899
 900                 request.wiphy_idx = get_wiphy_idx(wiphy);
 901                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 902                 request.alpha2[0] = '9';
 903                 request.alpha2[1] = '9';
 904
 905                 nl80211_send_reg_change_event(&request);
 906         }
 907
 908         /* Check that nobody globally advertises any capabilities they do not
 909          * advertise on all possible interface types.
 910          */
 911         if (wiphy->extended_capabilities_len &&
 912             wiphy->num_iftype_ext_capab &&
 913             wiphy->iftype_ext_capab) {
 914                 u8 supported_on_all, j;
 915                 const struct wiphy_iftype_ext_capab *capab;
 916
 917                 capab = wiphy->iftype_ext_capab;
 918                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
 919                         if (capab[0].extended_capabilities_len > j)
 920                                 supported_on_all =
 921                                         capab[0].extended_capabilities[j];
 922                         else
 923                                 supported_on_all = 0x00;
 924                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
 925                                 if (j >= capab[i].extended_capabilities_len) {
 926                                         supported_on_all = 0x00;
 927                                         break;
 928                                 }
 929                                 supported_on_all &=
 930                                         capab[i].extended_capabilities[j];
 931                         }
 932                         if (WARN_ON(wiphy->extended_capabilities[j] &
 933                                     ~supported_on_all))
 934                                 break;
 935                 }
 936         }
 937
 938         rdev->wiphy.registered = true;
 939         rtnl_unlock();
 940
 941         res = rfkill_register(rdev->rfkill);
 942         if (res) {
 943                 rfkill_destroy(rdev->rfkill);
 944                 rdev->rfkill = NULL;
 945                 wiphy_unregister(&rdev->wiphy);
 946                 return res;
 947         }
 948
 949         return 0;
 950 }
 951 EXPORT_SYMBOL(wiphy_register);
 952
 953 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 954 {
 955         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 956
 957         if (!rdev->ops->rfkill_poll)
 958                 return;
 959         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 960         rfkill_resume_polling(rdev->rfkill);
 961 }
 962 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 963
 964 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 965 {
 966         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 967
 968         rfkill_pause_polling(rdev->rfkill);
 969 }
 970 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 971
 972 void wiphy_unregister(struct wiphy *wiphy)
 973 {
 974         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 975
 976         wait_event(rdev->dev_wait, ({
 977                 int __count;
 978                 rtnl_lock();
 979                 __count = rdev->opencount;
 980                 rtnl_unlock();
 981                 __count == 0; }));
 982
 983         if (rdev->rfkill)
 984                 rfkill_unregister(rdev->rfkill);
 985
 986         rtnl_lock();
 987         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 988         rdev->wiphy.registered = false;
 989
 990         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
 991
 992         /*
 993          * First remove the hardware from everywhere, this makes
 994          * it impossible to find from userspace.
 995          */
 996         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 997         list_del_rcu(&rdev->list);
 998         synchronize_rcu();
 999
1000         /*
1001          * If this device got a regulatory hint tell core its
1002          * free to listen now to a new shiny device regulatory hint
1003          */
1004         wiphy_regulatory_deregister(wiphy);
1005
1006         cfg80211_rdev_list_generation++;
1007         device_del(&rdev->wiphy.dev);
1008
1009         rtnl_unlock();
1010
1011         flush_work(&rdev->scan_done_wk);
1012         cancel_work_sync(&rdev->conn_work);
1013         flush_work(&rdev->event_work);
1014         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1015         flush_work(&rdev->destroy_work);
1016         flush_work(&rdev->sched_scan_stop_wk);
1017         flush_work(&rdev->mlme_unreg_wk);
1018         flush_work(&rdev->propagate_radar_detect_wk);
1019         flush_work(&rdev->propagate_cac_done_wk);
1020
1021 #ifdef CONFIG_PM
1022         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1023                 rdev_set_wakeup(rdev, false);
1024 #endif
1025         cfg80211_rdev_free_wowlan(rdev);
1026         cfg80211_rdev_free_coalesce(rdev);
1027 }
1028 EXPORT_SYMBOL(wiphy_unregister);
1029
1030 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1031 {
1032         struct cfg80211_internal_bss *scan, *tmp;
1033         struct cfg80211_beacon_registration *reg, *treg;
1034         rfkill_destroy(rdev->rfkill);
1035         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1036                 list_del(&reg->list);
1037                 kfree(reg);
1038         }
1039         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1040                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1041         kfree(rdev);
1042 }
1043
1044 void wiphy_free(struct wiphy *wiphy)
1045 {
1046         put_device(&wiphy->dev);
1047 }
1048 EXPORT_SYMBOL(wiphy_free);
1049
1050 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
1051 {
1052         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1053
1054         if (rfkill_set_hw_state(rdev->rfkill, blocked))
1055                 schedule_work(&rdev->rfkill_sync);
1056 }
1057 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
1058
1059 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1060 {
1061         kfree(wdev->cqm_config);
1062         wdev->cqm_config = NULL;
1063 }
1064
1065 static void __cfg80211_unregister_wdev(struct wireless_dev *wdev, bool sync)
1066 {
1067         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1068
1069         ASSERT_RTNL();
1070
1071         flush_work(&wdev->pmsr_free_wk);
1072
1073         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1074
1075         list_del_rcu(&wdev->list);
1076         if (sync)
1077                 synchronize_rcu();
1078         rdev->devlist_generation++;
1079
1080         cfg80211_mlme_purge_registrations(wdev);
1081
1082         switch (wdev->iftype) {
1083         case NL80211_IFTYPE_P2P_DEVICE:
1084                 cfg80211_stop_p2p_device(rdev, wdev);
1085                 break;
1086         case NL80211_IFTYPE_NAN:
1087                 cfg80211_stop_nan(rdev, wdev);
1088                 break;
1089         default:
1090                 break;
1091         }
1092
1093 #ifdef CONFIG_CFG80211_WEXT
1094         kzfree(wdev->wext.keys);
1095 #endif
1096         /* only initialized if we have a netdev */
1097         if (wdev->netdev)
1098                 flush_work(&wdev->disconnect_wk);
1099
1100         cfg80211_cqm_config_free(wdev);
1101 }
1102
1103 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1104 {
1105         if (WARN_ON(wdev->netdev))
1106                 return;
1107
1108         __cfg80211_unregister_wdev(wdev, true);
1109 }
1110 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1111
1112 static const struct device_type wiphy_type = {
1113         .name   = "wlan",
1114 };
1115
1116 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1117                                enum nl80211_iftype iftype, int num)
1118 {
1119         ASSERT_RTNL();
1120
1121         rdev->num_running_ifaces += num;
1122         if (iftype == NL80211_IFTYPE_MONITOR)
1123                 rdev->num_running_monitor_ifaces += num;
1124 }
1125
1126 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1127                       struct wireless_dev *wdev)
1128 {
1129         struct net_device *dev = wdev->netdev;
1130         struct cfg80211_sched_scan_request *pos, *tmp;
1131
1132         ASSERT_RTNL();
1133         ASSERT_WDEV_LOCK(wdev);
1134
1135         cfg80211_pmsr_wdev_down(wdev);
1136
1137         switch (wdev->iftype) {
1138         case NL80211_IFTYPE_ADHOC:
1139                 __cfg80211_leave_ibss(rdev, dev, true);
1140                 break;
1141         case NL80211_IFTYPE_P2P_CLIENT:
1142         case NL80211_IFTYPE_STATION:
1143                 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1144                                          list) {
1145                         if (dev == pos->dev)
1146                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1147                 }
1148
1149 #ifdef CONFIG_CFG80211_WEXT
1150                 kfree(wdev->wext.ie);
1151                 wdev->wext.ie = NULL;
1152                 wdev->wext.ie_len = 0;
1153                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1154 #endif
1155                 cfg80211_disconnect(rdev, dev,
1156                                     WLAN_REASON_DEAUTH_LEAVING, true);
1157                 break;
1158         case NL80211_IFTYPE_MESH_POINT:
1159                 __cfg80211_leave_mesh(rdev, dev);
1160                 break;
1161         case NL80211_IFTYPE_AP:
1162         case NL80211_IFTYPE_P2P_GO:
1163                 __cfg80211_stop_ap(rdev, dev, true);
1164                 break;
1165         case NL80211_IFTYPE_OCB:
1166                 __cfg80211_leave_ocb(rdev, dev);
1167                 break;
1168         case NL80211_IFTYPE_WDS:
1169                 /* must be handled by mac80211/driver, has no APIs */
1170                 break;
1171         case NL80211_IFTYPE_P2P_DEVICE:
1172         case NL80211_IFTYPE_NAN:
1173                 /* cannot happen, has no netdev */
1174                 break;
1175         case NL80211_IFTYPE_AP_VLAN:
1176         case NL80211_IFTYPE_MONITOR:
1177                 /* nothing to do */
1178                 break;
1179         case NL80211_IFTYPE_UNSPECIFIED:
1180         case NUM_NL80211_IFTYPES:
1181                 /* invalid */
1182                 break;
1183         }
1184 }
1185
1186 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1187                     struct wireless_dev *wdev)
1188 {
1189         wdev_lock(wdev);
1190         __cfg80211_leave(rdev, wdev);
1191         wdev_unlock(wdev);
1192 }
1193
1194 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1195                          gfp_t gfp)
1196 {
1197         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1198         struct cfg80211_event *ev;
1199         unsigned long flags;
1200
1201         trace_cfg80211_stop_iface(wiphy, wdev);
1202
1203         ev = kzalloc(sizeof(*ev), gfp);
1204         if (!ev)
1205                 return;
1206
1207         ev->type = EVENT_STOPPED;
1208
1209         spin_lock_irqsave(&wdev->event_lock, flags);
1210         list_add_tail(&ev->list, &wdev->event_list);
1211         spin_unlock_irqrestore(&wdev->event_lock, flags);
1212         queue_work(cfg80211_wq, &rdev->event_work);
1213 }
1214 EXPORT_SYMBOL(cfg80211_stop_iface);
1215
1216 void cfg80211_init_wdev(struct cfg80211_registered_device *rdev,
1217                         struct wireless_dev *wdev)
1218 {
1219         mutex_init(&wdev->mtx);
1220         INIT_LIST_HEAD(&wdev->event_list);
1221         spin_lock_init(&wdev->event_lock);
1222         INIT_LIST_HEAD(&wdev->mgmt_registrations);
1223         spin_lock_init(&wdev->mgmt_registrations_lock);
1224         INIT_LIST_HEAD(&wdev->pmsr_list);
1225         spin_lock_init(&wdev->pmsr_lock);
1226         INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1227
1228         /*
1229          * We get here also when the interface changes network namespaces,
1230          * as it's registered into the new one, but we don't want it to
1231          * change ID in that case. Checking if the ID is already assigned
1232          * works, because 0 isn't considered a valid ID and the memory is
1233          * 0-initialized.
1234          */
1235         if (!wdev->identifier)
1236                 wdev->identifier = ++rdev->wdev_id;
1237         list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1238         rdev->devlist_generation++;
1239
1240         nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1241 }
1242
1243 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1244                                          unsigned long state, void *ptr)
1245 {
1246         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1247         struct wireless_dev *wdev = dev->ieee80211_ptr;
1248         struct cfg80211_registered_device *rdev;
1249         struct cfg80211_sched_scan_request *pos, *tmp;
1250
1251         if (!wdev)
1252                 return NOTIFY_DONE;
1253
1254         rdev = wiphy_to_rdev(wdev->wiphy);
1255
1256         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1257
1258         switch (state) {
1259         case NETDEV_POST_INIT:
1260                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1261                 break;
1262         case NETDEV_REGISTER:
1263                 /*
1264                  * NB: cannot take rdev->mtx here because this may be
1265                  * called within code protected by it when interfaces
1266                  * are added with nl80211.
1267                  */
1268                 /* can only change netns with wiphy */
1269                 dev->features |= NETIF_F_NETNS_LOCAL;
1270
1271                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1272                                       "phy80211")) {
1273                         pr_err("failed to add phy80211 symlink to netdev!\n");
1274                 }
1275                 wdev->netdev = dev;
1276 #ifdef CONFIG_CFG80211_WEXT
1277                 wdev->wext.default_key = -1;
1278                 wdev->wext.default_mgmt_key = -1;
1279                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1280 #endif
1281
1282                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1283                         wdev->ps = true;
1284                 else
1285                         wdev->ps = false;
1286                 /* allow mac80211 to determine the timeout */
1287                 wdev->ps_timeout = -1;
1288
1289                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1290                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1291                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1292                         dev->priv_flags |= IFF_DONT_BRIDGE;
1293
1294                 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1295
1296                 cfg80211_init_wdev(rdev, wdev);
1297                 break;
1298         case NETDEV_GOING_DOWN:
1299                 cfg80211_leave(rdev, wdev);
1300                 break;
1301         case NETDEV_DOWN:
1302                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1303                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1304                         if (WARN_ON(!rdev->scan_req->notified))
1305                                 rdev->scan_req->info.aborted = true;
1306                         ___cfg80211_scan_done(rdev, false);
1307                 }
1308
1309                 list_for_each_entry_safe(pos, tmp,
1310                                          &rdev->sched_scan_req_list, list) {
1311                         if (WARN_ON(pos->dev == wdev->netdev))
1312                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1313                 }
1314
1315                 rdev->opencount--;
1316                 wake_up(&rdev->dev_wait);
1317                 break;
1318         case NETDEV_UP:
1319                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1320                 wdev_lock(wdev);
1321                 switch (wdev->iftype) {
1322 #ifdef CONFIG_CFG80211_WEXT
1323                 case NL80211_IFTYPE_ADHOC:
1324                         cfg80211_ibss_wext_join(rdev, wdev);
1325                         break;
1326                 case NL80211_IFTYPE_STATION:
1327                         cfg80211_mgd_wext_connect(rdev, wdev);
1328                         break;
1329 #endif
1330 #ifdef CONFIG_MAC80211_MESH
1331                 case NL80211_IFTYPE_MESH_POINT:
1332                         {
1333                                 /* backward compat code... */
1334                                 struct mesh_setup setup;
1335                                 memcpy(&setup, &default_mesh_setup,
1336                                                 sizeof(setup));
1337                                  /* back compat only needed for mesh_id */
1338                                 setup.mesh_id = wdev->ssid;
1339                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1340                                 if (wdev->mesh_id_up_len)
1341                                         __cfg80211_join_mesh(rdev, dev,
1342                                                         &setup,
1343                                                         &default_mesh_config);
1344                                 break;
1345                         }
1346 #endif
1347                 default:
1348                         break;
1349                 }
1350                 wdev_unlock(wdev);
1351                 rdev->opencount++;
1352
1353                 /*
1354                  * Configure power management to the driver here so that its
1355                  * correctly set also after interface type changes etc.
1356                  */
1357                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1358                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1359                     rdev->ops->set_power_mgmt &&
1360                     rdev_set_power_mgmt(rdev, dev, wdev->ps,
1361                                         wdev->ps_timeout)) {
1362                         /* assume this means it's off */
1363                         wdev->ps = false;
1364                 }
1365                 break;
1366         case NETDEV_UNREGISTER:
1367                 /*
1368                  * It is possible to get NETDEV_UNREGISTER
1369                  * multiple times. To detect that, check
1370                  * that the interface is still on the list
1371                  * of registered interfaces, and only then
1372                  * remove and clean it up.
1373                  */
1374                 if (!list_empty(&wdev->list)) {
1375                         __cfg80211_unregister_wdev(wdev, false);
1376                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1377                 }
1378                 /*
1379                  * synchronise (so that we won't find this netdev
1380                  * from other code any more) and then clear the list
1381                  * head so that the above code can safely check for
1382                  * !list_empty() to avoid double-cleanup.
1383                  */
1384                 synchronize_rcu();
1385                 INIT_LIST_HEAD(&wdev->list);
1386                 /*
1387                  * Ensure that all events have been processed and
1388                  * freed.
1389                  */
1390                 cfg80211_process_wdev_events(wdev);
1391
1392                 if (WARN_ON(wdev->current_bss)) {
1393                         cfg80211_unhold_bss(wdev->current_bss);
1394                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1395                         wdev->current_bss = NULL;
1396                 }
1397                 break;
1398         case NETDEV_PRE_UP:
1399                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1400                         return notifier_from_errno(-EOPNOTSUPP);
1401                 if (rfkill_blocked(rdev->rfkill))
1402                         return notifier_from_errno(-ERFKILL);
1403                 break;
1404         default:
1405                 return NOTIFY_DONE;
1406         }
1407
1408         wireless_nlevent_flush();
1409
1410         return NOTIFY_OK;
1411 }
1412
1413 static struct notifier_block cfg80211_netdev_notifier = {
1414         .notifier_call = cfg80211_netdev_notifier_call,
1415 };
1416
1417 static void __net_exit cfg80211_pernet_exit(struct net *net)
1418 {
1419         struct cfg80211_registered_device *rdev;
1420
1421         rtnl_lock();
1422         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1423                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1424                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1425         }
1426         rtnl_unlock();
1427 }
1428
1429 static struct pernet_operations cfg80211_pernet_ops = {
1430         .exit = cfg80211_pernet_exit,
1431 };
1432
1433 static int __init cfg80211_init(void)
1434 {
1435         int err;
1436
1437         err = register_pernet_device(&cfg80211_pernet_ops);
1438         if (err)
1439                 goto out_fail_pernet;
1440
1441         err = wiphy_sysfs_init();
1442         if (err)
1443                 goto out_fail_sysfs;
1444
1445         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1446         if (err)
1447                 goto out_fail_notifier;
1448
1449         err = nl80211_init();
1450         if (err)
1451                 goto out_fail_nl80211;
1452
1453         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1454
1455         err = regulatory_init();
1456         if (err)
1457                 goto out_fail_reg;
1458
1459         cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1460         if (!cfg80211_wq) {
1461                 err = -ENOMEM;
1462                 goto out_fail_wq;
1463         }
1464
1465         return 0;
1466
1467 out_fail_wq:
1468         regulatory_exit();
1469 out_fail_reg:
1470         debugfs_remove(ieee80211_debugfs_dir);
1471         nl80211_exit();
1472 out_fail_nl80211:
1473         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1474 out_fail_notifier:
1475         wiphy_sysfs_exit();
1476 out_fail_sysfs:
1477         unregister_pernet_device(&cfg80211_pernet_ops);
1478 out_fail_pernet:
1479         return err;
1480 }
1481 fs_initcall(cfg80211_init);
1482
1483 static void __exit cfg80211_exit(void)
1484 {
1485         debugfs_remove(ieee80211_debugfs_dir);
1486         nl80211_exit();
1487         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1488         wiphy_sysfs_exit();
1489         regulatory_exit();
1490         unregister_pernet_device(&cfg80211_pernet_ops);
1491         destroy_workqueue(cfg80211_wq);
1492 }
1493 module_exit(cfg80211_exit);