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