net/wireless/core.c

   1 /*
   2  * This is the linux wireless configuration interface.
   3  *
   4  * Copyright 2006-2010          Johannes Berg <[email protected]>
   5  * Copyright 2013-2014  Intel Mobile Communications GmbH
   6  */
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/if.h>
  11 #include <linux/module.h>
  12 #include <linux/err.h>
  13 #include <linux/list.h>
  14 #include <linux/slab.h>
  15 #include <linux/nl80211.h>
  16 #include <linux/debugfs.h>
  17 #include <linux/notifier.h>
  18 #include <linux/device.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/sched.h>
  22 #include <net/genetlink.h>
  23 #include <net/cfg80211.h>
  24 #include "nl80211.h"
  25 #include "core.h"
  26 #include "sysfs.h"
  27 #include "debugfs.h"
  28 #include "wext-compat.h"
  29 #include "rdev-ops.h"
  30
  31 /* name for sysfs, %d is appended */
  32 #define PHY_NAME "phy"
  33
  34 MODULE_AUTHOR("Johannes Berg");
  35 MODULE_LICENSE("GPL");
  36 MODULE_DESCRIPTION("wireless configuration support");
  37 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
  38
  39 /* RCU-protected (and RTNL for writers) */
  40 LIST_HEAD(cfg80211_rdev_list);
  41 int cfg80211_rdev_list_generation;
  42
  43 /* for debugfs */
  44 static struct dentry *ieee80211_debugfs_dir;
  45
  46 /* for the cleanup, scan and event works */
  47 struct workqueue_struct *cfg80211_wq;
  48
  49 static bool cfg80211_disable_40mhz_24ghz;
  50 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  51 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  52                  "Disable 40MHz support in the 2.4GHz band");
  53
  54 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  55 {
  56         struct cfg80211_registered_device *result = NULL, *rdev;
  57
  58         ASSERT_RTNL();
  59
  60         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  61                 if (rdev->wiphy_idx == wiphy_idx) {
  62                         result = rdev;
  63                         break;
  64                 }
  65         }
  66
  67         return result;
  68 }
  69
  70 int get_wiphy_idx(struct wiphy *wiphy)
  71 {
  72         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
  73
  74         return rdev->wiphy_idx;
  75 }
  76
  77 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  78 {
  79         struct cfg80211_registered_device *rdev;
  80
  81         ASSERT_RTNL();
  82
  83         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  84         if (!rdev)
  85                 return NULL;
  86         return &rdev->wiphy;
  87 }
  88
  89 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
  90                         char *newname)
  91 {
  92         struct cfg80211_registered_device *rdev2;
  93         int wiphy_idx, taken = -1, result, digits;
  94
  95         ASSERT_RTNL();
  96
  97         /* prohibit calling the thing phy%d when %d is not its number */
  98         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
  99         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 100                 /* count number of places needed to print wiphy_idx */
 101                 digits = 1;
 102                 while (wiphy_idx /= 10)
 103                         digits++;
 104                 /*
 105                  * deny the name if it is phy<idx> where <idx> is printed
 106                  * without leading zeroes. taken == strlen(newname) here
 107                  */
 108                 if (taken == strlen(PHY_NAME) + digits)
 109                         return -EINVAL;
 110         }
 111
 112
 113         /* Ignore nop renames */
 114         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
 115                 return 0;
 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, dev_name(&rdev2->wiphy.dev)) == 0)
 120                         return -EINVAL;
 121
 122         result = device_rename(&rdev->wiphy.dev, newname);
 123         if (result)
 124                 return result;
 125
 126         if (rdev->wiphy.debugfsdir &&
 127             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 128                             rdev->wiphy.debugfsdir,
 129                             rdev->wiphy.debugfsdir->d_parent,
 130                             newname))
 131                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 132
 133         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 134
 135         return 0;
 136 }
 137
 138 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 139                           struct net *net)
 140 {
 141         struct wireless_dev *wdev;
 142         int err = 0;
 143
 144         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 145                 return -EOPNOTSUPP;
 146
 147         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 148                 if (!wdev->netdev)
 149                         continue;
 150                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 151                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 152                 if (err)
 153                         break;
 154                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 155         }
 156
 157         if (err) {
 158                 /* failed -- clean up to old netns */
 159                 net = wiphy_net(&rdev->wiphy);
 160
 161                 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,
 162                                                      list) {
 163                         if (!wdev->netdev)
 164                                 continue;
 165                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 166                         err = dev_change_net_namespace(wdev->netdev, net,
 167                                                         "wlan%d");
 168                         WARN_ON(err);
 169                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 170                 }
 171
 172                 return err;
 173         }
 174
 175         wiphy_net_set(&rdev->wiphy, net);
 176
 177         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 178         WARN_ON(err);
 179
 180         return 0;
 181 }
 182
 183 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 184 {
 185         struct cfg80211_registered_device *rdev = data;
 186
 187         rdev_rfkill_poll(rdev);
 188 }
 189
 190 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 191                               struct wireless_dev *wdev)
 192 {
 193         ASSERT_RTNL();
 194
 195         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 196                 return;
 197
 198         if (!wdev->p2p_started)
 199                 return;
 200
 201         rdev_stop_p2p_device(rdev, wdev);
 202         wdev->p2p_started = false;
 203
 204         rdev->opencount--;
 205
 206         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 207                 if (WARN_ON(!rdev->scan_req->notified))
 208                         rdev->scan_req->aborted = true;
 209                 ___cfg80211_scan_done(rdev, false);
 210         }
 211 }
 212
 213 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 214 {
 215         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 216         struct wireless_dev *wdev;
 217
 218         ASSERT_RTNL();
 219
 220         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 221                 if (wdev->netdev) {
 222                         dev_close(wdev->netdev);
 223                         continue;
 224                 }
 225                 /* otherwise, check iftype */
 226                 switch (wdev->iftype) {
 227                 case NL80211_IFTYPE_P2P_DEVICE:
 228                         cfg80211_stop_p2p_device(rdev, wdev);
 229                         break;
 230                 default:
 231                         break;
 232                 }
 233         }
 234 }
 235 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 236
 237 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 238 {
 239         struct cfg80211_registered_device *rdev = data;
 240
 241         if (!blocked)
 242                 return 0;
 243
 244         rtnl_lock();
 245         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 246         rtnl_unlock();
 247
 248         return 0;
 249 }
 250
 251 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 252 {
 253         struct cfg80211_registered_device *rdev;
 254
 255         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 256         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 257 }
 258
 259 static void cfg80211_event_work(struct work_struct *work)
 260 {
 261         struct cfg80211_registered_device *rdev;
 262
 263         rdev = container_of(work, struct cfg80211_registered_device,
 264                             event_work);
 265
 266         rtnl_lock();
 267         cfg80211_process_rdev_events(rdev);
 268         rtnl_unlock();
 269 }
 270
 271 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 272 {
 273         struct cfg80211_iface_destroy *item;
 274
 275         ASSERT_RTNL();
 276
 277         spin_lock_irq(&rdev->destroy_list_lock);
 278         while ((item = list_first_entry_or_null(&rdev->destroy_list,
 279                                                 struct cfg80211_iface_destroy,
 280                                                 list))) {
 281                 struct wireless_dev *wdev, *tmp;
 282                 u32 nlportid = item->nlportid;
 283
 284                 list_del(&item->list);
 285                 kfree(item);
 286                 spin_unlock_irq(&rdev->destroy_list_lock);
 287
 288                 list_for_each_entry_safe(wdev, tmp, &rdev->wdev_list, list) {
 289                         if (nlportid == wdev->owner_nlportid)
 290                                 rdev_del_virtual_intf(rdev, wdev);
 291                 }
 292
 293                 spin_lock_irq(&rdev->destroy_list_lock);
 294         }
 295         spin_unlock_irq(&rdev->destroy_list_lock);
 296 }
 297
 298 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 299 {
 300         struct cfg80211_registered_device *rdev;
 301
 302         rdev = container_of(work, struct cfg80211_registered_device,
 303                             destroy_work);
 304
 305         rtnl_lock();
 306         cfg80211_destroy_ifaces(rdev);
 307         rtnl_unlock();
 308 }
 309
 310 /* exported functions */
 311
 312 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 313 {
 314         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 315
 316         struct cfg80211_registered_device *rdev;
 317         int alloc_size;
 318
 319         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 320         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 321         WARN_ON(ops->connect && !ops->disconnect);
 322         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 323         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 324         WARN_ON(ops->add_station && !ops->del_station);
 325         WARN_ON(ops->add_mpath && !ops->del_mpath);
 326         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 327
 328         alloc_size = sizeof(*rdev) + sizeof_priv;
 329
 330         rdev = kzalloc(alloc_size, GFP_KERNEL);
 331         if (!rdev)
 332                 return NULL;
 333
 334         rdev->ops = ops;
 335
 336         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 337
 338         if (unlikely(rdev->wiphy_idx < 0)) {
 339                 /* ugh, wrapped! */
 340                 atomic_dec(&wiphy_counter);
 341                 kfree(rdev);
 342                 return NULL;
 343         }
 344
 345         /* atomic_inc_return makes it start at 1, make it start at 0 */
 346         rdev->wiphy_idx--;
 347
 348         /* give it a proper name */
 349         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 350
 351         INIT_LIST_HEAD(&rdev->wdev_list);
 352         INIT_LIST_HEAD(&rdev->beacon_registrations);
 353         spin_lock_init(&rdev->beacon_registrations_lock);
 354         spin_lock_init(&rdev->bss_lock);
 355         INIT_LIST_HEAD(&rdev->bss_list);
 356         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 357         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 358         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 359                           cfg80211_dfs_channels_update_work);
 360 #ifdef CONFIG_CFG80211_WEXT
 361         rdev->wiphy.wext = &cfg80211_wext_handler;
 362 #endif
 363
 364         device_initialize(&rdev->wiphy.dev);
 365         rdev->wiphy.dev.class = &ieee80211_class;
 366         rdev->wiphy.dev.platform_data = rdev;
 367
 368         INIT_LIST_HEAD(&rdev->destroy_list);
 369         spin_lock_init(&rdev->destroy_list_lock);
 370         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 371
 372 #ifdef CONFIG_CFG80211_DEFAULT_PS
 373         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 374 #endif
 375
 376         wiphy_net_set(&rdev->wiphy, &init_net);
 377
 378         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 379         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 380                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 381                                    &rdev->rfkill_ops, rdev);
 382
 383         if (!rdev->rfkill) {
 384                 kfree(rdev);
 385                 return NULL;
 386         }
 387
 388         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 389         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 390         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 391
 392         init_waitqueue_head(&rdev->dev_wait);
 393
 394         /*
 395          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 396          * Fragmentation and RTS threshold are disabled by default with the
 397          * special -1 value.
 398          */
 399         rdev->wiphy.retry_short = 7;
 400         rdev->wiphy.retry_long = 4;
 401         rdev->wiphy.frag_threshold = (u32) -1;
 402         rdev->wiphy.rts_threshold = (u32) -1;
 403         rdev->wiphy.coverage_class = 0;
 404
 405         rdev->wiphy.max_num_csa_counters = 1;
 406
 407         return &rdev->wiphy;
 408 }
 409 EXPORT_SYMBOL(wiphy_new);
 410
 411 static int wiphy_verify_combinations(struct wiphy *wiphy)
 412 {
 413         const struct ieee80211_iface_combination *c;
 414         int i, j;
 415
 416         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 417                 u32 cnt = 0;
 418                 u16 all_iftypes = 0;
 419
 420                 c = &wiphy->iface_combinations[i];
 421
 422                 /*
 423                  * Combinations with just one interface aren't real,
 424                  * however we make an exception for DFS.
 425                  */
 426                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 427                         return -EINVAL;
 428
 429                 /* Need at least one channel */
 430                 if (WARN_ON(!c->num_different_channels))
 431                         return -EINVAL;
 432
 433                 /*
 434                  * Put a sane limit on maximum number of different
 435                  * channels to simplify channel accounting code.
 436                  */
 437                 if (WARN_ON(c->num_different_channels >
 438                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 439                         return -EINVAL;
 440
 441                 /* DFS only works on one channel. */
 442                 if (WARN_ON(c->radar_detect_widths &&
 443                             (c->num_different_channels > 1)))
 444                         return -EINVAL;
 445
 446                 if (WARN_ON(!c->n_limits))
 447                         return -EINVAL;
 448
 449                 for (j = 0; j < c->n_limits; j++) {
 450                         u16 types = c->limits[j].types;
 451
 452                         /* interface types shouldn't overlap */
 453                         if (WARN_ON(types & all_iftypes))
 454                                 return -EINVAL;
 455                         all_iftypes |= types;
 456
 457                         if (WARN_ON(!c->limits[j].max))
 458                                 return -EINVAL;
 459
 460                         /* Shouldn't list software iftypes in combinations! */
 461                         if (WARN_ON(wiphy->software_iftypes & types))
 462                                 return -EINVAL;
 463
 464                         /* Only a single P2P_DEVICE can be allowed */
 465                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 466                                     c->limits[j].max > 1))
 467                                 return -EINVAL;
 468
 469                         cnt += c->limits[j].max;
 470                         /*
 471                          * Don't advertise an unsupported type
 472                          * in a combination.
 473                          */
 474                         if (WARN_ON((wiphy->interface_modes & types) != types))
 475                                 return -EINVAL;
 476                 }
 477
 478                 /* You can't even choose that many! */
 479                 if (WARN_ON(cnt < c->max_interfaces))
 480                         return -EINVAL;
 481         }
 482
 483         return 0;
 484 }
 485
 486 int wiphy_register(struct wiphy *wiphy)
 487 {
 488         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 489         int res;
 490         enum ieee80211_band band;
 491         struct ieee80211_supported_band *sband;
 492         bool have_band = false;
 493         int i;
 494         u16 ifmodes = wiphy->interface_modes;
 495
 496 #ifdef CONFIG_PM
 497         if (WARN_ON(wiphy->wowlan &&
 498                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 499                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 500                 return -EINVAL;
 501         if (WARN_ON(wiphy->wowlan &&
 502                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 503                     !wiphy->wowlan->tcp))
 504                 return -EINVAL;
 505 #endif
 506
 507         if (WARN_ON(wiphy->coalesce &&
 508                     (!wiphy->coalesce->n_rules ||
 509                      !wiphy->coalesce->n_patterns) &&
 510                     (!wiphy->coalesce->pattern_min_len ||
 511                      wiphy->coalesce->pattern_min_len >
 512                         wiphy->coalesce->pattern_max_len)))
 513                 return -EINVAL;
 514
 515         if (WARN_ON(wiphy->ap_sme_capa &&
 516                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 517                 return -EINVAL;
 518
 519         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 520                 return -EINVAL;
 521
 522         if (WARN_ON(wiphy->addresses &&
 523                     !is_zero_ether_addr(wiphy->perm_addr) &&
 524                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 525                            ETH_ALEN)))
 526                 return -EINVAL;
 527
 528         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 529                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 530                      !rdev->ops->set_mac_acl)))
 531                 return -EINVAL;
 532
 533         if (wiphy->addresses)
 534                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 535
 536         /* sanity check ifmodes */
 537         WARN_ON(!ifmodes);
 538         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 539         if (WARN_ON(ifmodes != wiphy->interface_modes))
 540                 wiphy->interface_modes = ifmodes;
 541
 542         res = wiphy_verify_combinations(wiphy);
 543         if (res)
 544                 return res;
 545
 546         /* sanity check supported bands/channels */
 547         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 548                 sband = wiphy->bands[band];
 549                 if (!sband)
 550                         continue;
 551
 552                 sband->band = band;
 553                 if (WARN_ON(!sband->n_channels))
 554                         return -EINVAL;
 555                 /*
 556                  * on 60gHz band, there are no legacy rates, so
 557                  * n_bitrates is 0
 558                  */
 559                 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
 560                             !sband->n_bitrates))
 561                         return -EINVAL;
 562
 563                 /*
 564                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 565                  * modify the sband's ht data even if the driver uses a
 566                  * global structure for that.
 567                  */
 568                 if (cfg80211_disable_40mhz_24ghz &&
 569                     band == IEEE80211_BAND_2GHZ &&
 570                     sband->ht_cap.ht_supported) {
 571                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 572                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 573                 }
 574
 575                 /*
 576                  * Since we use a u32 for rate bitmaps in
 577                  * ieee80211_get_response_rate, we cannot
 578                  * have more than 32 legacy rates.
 579                  */
 580                 if (WARN_ON(sband->n_bitrates > 32))
 581                         return -EINVAL;
 582
 583                 for (i = 0; i < sband->n_channels; i++) {
 584                         sband->channels[i].orig_flags =
 585                                 sband->channels[i].flags;
 586                         sband->channels[i].orig_mag = INT_MAX;
 587                         sband->channels[i].orig_mpwr =
 588                                 sband->channels[i].max_power;
 589                         sband->channels[i].band = band;
 590                 }
 591
 592                 have_band = true;
 593         }
 594
 595         if (!have_band) {
 596                 WARN_ON(1);
 597                 return -EINVAL;
 598         }
 599
 600 #ifdef CONFIG_PM
 601         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 602                     (!rdev->wiphy.wowlan->pattern_min_len ||
 603                      rdev->wiphy.wowlan->pattern_min_len >
 604                                 rdev->wiphy.wowlan->pattern_max_len)))
 605                 return -EINVAL;
 606 #endif
 607
 608         /* check and set up bitrates */
 609         ieee80211_set_bitrate_flags(wiphy);
 610
 611         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 612
 613         rtnl_lock();
 614         res = device_add(&rdev->wiphy.dev);
 615         if (res) {
 616                 rtnl_unlock();
 617                 return res;
 618         }
 619
 620         /* set up regulatory info */
 621         wiphy_regulatory_register(wiphy);
 622
 623         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 624         cfg80211_rdev_list_generation++;
 625
 626         /* add to debugfs */
 627         rdev->wiphy.debugfsdir =
 628                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 629                                    ieee80211_debugfs_dir);
 630         if (IS_ERR(rdev->wiphy.debugfsdir))
 631                 rdev->wiphy.debugfsdir = NULL;
 632
 633         cfg80211_debugfs_rdev_add(rdev);
 634         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 635
 636         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 637                 struct regulatory_request request;
 638
 639                 request.wiphy_idx = get_wiphy_idx(wiphy);
 640                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 641                 request.alpha2[0] = '9';
 642                 request.alpha2[1] = '9';
 643
 644                 nl80211_send_reg_change_event(&request);
 645         }
 646
 647         rdev->wiphy.registered = true;
 648         rtnl_unlock();
 649
 650         res = rfkill_register(rdev->rfkill);
 651         if (res) {
 652                 rfkill_destroy(rdev->rfkill);
 653                 rdev->rfkill = NULL;
 654                 wiphy_unregister(&rdev->wiphy);
 655                 return res;
 656         }
 657
 658         return 0;
 659 }
 660 EXPORT_SYMBOL(wiphy_register);
 661
 662 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 663 {
 664         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 665
 666         if (!rdev->ops->rfkill_poll)
 667                 return;
 668         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 669         rfkill_resume_polling(rdev->rfkill);
 670 }
 671 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 672
 673 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 674 {
 675         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 676
 677         rfkill_pause_polling(rdev->rfkill);
 678 }
 679 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 680
 681 void wiphy_unregister(struct wiphy *wiphy)
 682 {
 683         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 684
 685         wait_event(rdev->dev_wait, ({
 686                 int __count;
 687                 rtnl_lock();
 688                 __count = rdev->opencount;
 689                 rtnl_unlock();
 690                 __count == 0; }));
 691
 692         if (rdev->rfkill)
 693                 rfkill_unregister(rdev->rfkill);
 694
 695         rtnl_lock();
 696         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 697         rdev->wiphy.registered = false;
 698
 699         WARN_ON(!list_empty(&rdev->wdev_list));
 700
 701         /*
 702          * First remove the hardware from everywhere, this makes
 703          * it impossible to find from userspace.
 704          */
 705         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 706         list_del_rcu(&rdev->list);
 707         synchronize_rcu();
 708
 709         /*
 710          * If this device got a regulatory hint tell core its
 711          * free to listen now to a new shiny device regulatory hint
 712          */
 713         wiphy_regulatory_deregister(wiphy);
 714
 715         cfg80211_rdev_list_generation++;
 716         device_del(&rdev->wiphy.dev);
 717
 718         rtnl_unlock();
 719
 720         flush_work(&rdev->scan_done_wk);
 721         cancel_work_sync(&rdev->conn_work);
 722         flush_work(&rdev->event_work);
 723         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 724         flush_work(&rdev->destroy_work);
 725
 726 #ifdef CONFIG_PM
 727         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
 728                 rdev_set_wakeup(rdev, false);
 729 #endif
 730         cfg80211_rdev_free_wowlan(rdev);
 731         cfg80211_rdev_free_coalesce(rdev);
 732 }
 733 EXPORT_SYMBOL(wiphy_unregister);
 734
 735 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 736 {
 737         struct cfg80211_internal_bss *scan, *tmp;
 738         struct cfg80211_beacon_registration *reg, *treg;
 739         rfkill_destroy(rdev->rfkill);
 740         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 741                 list_del(&reg->list);
 742                 kfree(reg);
 743         }
 744         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 745                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 746         kfree(rdev);
 747 }
 748
 749 void wiphy_free(struct wiphy *wiphy)
 750 {
 751         put_device(&wiphy->dev);
 752 }
 753 EXPORT_SYMBOL(wiphy_free);
 754
 755 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 756 {
 757         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 758
 759         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 760                 schedule_work(&rdev->rfkill_sync);
 761 }
 762 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 763
 764 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 765 {
 766         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 767
 768         ASSERT_RTNL();
 769
 770         if (WARN_ON(wdev->netdev))
 771                 return;
 772
 773         list_del_rcu(&wdev->list);
 774         rdev->devlist_generation++;
 775
 776         switch (wdev->iftype) {
 777         case NL80211_IFTYPE_P2P_DEVICE:
 778                 cfg80211_stop_p2p_device(rdev, wdev);
 779                 break;
 780         default:
 781                 WARN_ON_ONCE(1);
 782                 break;
 783         }
 784 }
 785 EXPORT_SYMBOL(cfg80211_unregister_wdev);
 786
 787 static const struct device_type wiphy_type = {
 788         .name   = "wlan",
 789 };
 790
 791 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 792                                enum nl80211_iftype iftype, int num)
 793 {
 794         ASSERT_RTNL();
 795
 796         rdev->num_running_ifaces += num;
 797         if (iftype == NL80211_IFTYPE_MONITOR)
 798                 rdev->num_running_monitor_ifaces += num;
 799 }
 800
 801 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
 802                       struct wireless_dev *wdev)
 803 {
 804         struct net_device *dev = wdev->netdev;
 805
 806         ASSERT_RTNL();
 807         ASSERT_WDEV_LOCK(wdev);
 808
 809         switch (wdev->iftype) {
 810         case NL80211_IFTYPE_ADHOC:
 811                 __cfg80211_leave_ibss(rdev, dev, true);
 812                 break;
 813         case NL80211_IFTYPE_P2P_CLIENT:
 814         case NL80211_IFTYPE_STATION:
 815                 if (rdev->sched_scan_req && dev == rdev->sched_scan_req->dev)
 816                         __cfg80211_stop_sched_scan(rdev, false);
 817
 818 #ifdef CONFIG_CFG80211_WEXT
 819                 kfree(wdev->wext.ie);
 820                 wdev->wext.ie = NULL;
 821                 wdev->wext.ie_len = 0;
 822                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 823 #endif
 824                 cfg80211_disconnect(rdev, dev,
 825                                     WLAN_REASON_DEAUTH_LEAVING, true);
 826                 break;
 827         case NL80211_IFTYPE_MESH_POINT:
 828                 __cfg80211_leave_mesh(rdev, dev);
 829                 break;
 830         case NL80211_IFTYPE_AP:
 831         case NL80211_IFTYPE_P2P_GO:
 832                 __cfg80211_stop_ap(rdev, dev, true);
 833                 break;
 834         default:
 835                 break;
 836         }
 837 }
 838
 839 void cfg80211_leave(struct cfg80211_registered_device *rdev,
 840                     struct wireless_dev *wdev)
 841 {
 842         wdev_lock(wdev);
 843         __cfg80211_leave(rdev, wdev);
 844         wdev_unlock(wdev);
 845 }
 846
 847 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
 848                          gfp_t gfp)
 849 {
 850         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 851         struct cfg80211_event *ev;
 852         unsigned long flags;
 853
 854         trace_cfg80211_stop_iface(wiphy, wdev);
 855
 856         ev = kzalloc(sizeof(*ev), gfp);
 857         if (!ev)
 858                 return;
 859
 860         ev->type = EVENT_STOPPED;
 861
 862         spin_lock_irqsave(&wdev->event_lock, flags);
 863         list_add_tail(&ev->list, &wdev->event_list);
 864         spin_unlock_irqrestore(&wdev->event_lock, flags);
 865         queue_work(cfg80211_wq, &rdev->event_work);
 866 }
 867 EXPORT_SYMBOL(cfg80211_stop_iface);
 868
 869 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 870                                          unsigned long state, void *ptr)
 871 {
 872         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 873         struct wireless_dev *wdev = dev->ieee80211_ptr;
 874         struct cfg80211_registered_device *rdev;
 875
 876         if (!wdev)
 877                 return NOTIFY_DONE;
 878
 879         rdev = wiphy_to_rdev(wdev->wiphy);
 880
 881         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 882
 883         switch (state) {
 884         case NETDEV_POST_INIT:
 885                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 886                 break;
 887         case NETDEV_REGISTER:
 888                 /*
 889                  * NB: cannot take rdev->mtx here because this may be
 890                  * called within code protected by it when interfaces
 891                  * are added with nl80211.
 892                  */
 893                 mutex_init(&wdev->mtx);
 894                 INIT_LIST_HEAD(&wdev->event_list);
 895                 spin_lock_init(&wdev->event_lock);
 896                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
 897                 spin_lock_init(&wdev->mgmt_registrations_lock);
 898
 899                 wdev->identifier = ++rdev->wdev_id;
 900                 list_add_rcu(&wdev->list, &rdev->wdev_list);
 901                 rdev->devlist_generation++;
 902                 /* can only change netns with wiphy */
 903                 dev->features |= NETIF_F_NETNS_LOCAL;
 904
 905                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 906                                       "phy80211")) {
 907                         pr_err("failed to add phy80211 symlink to netdev!\n");
 908                 }
 909                 wdev->netdev = dev;
 910 #ifdef CONFIG_CFG80211_WEXT
 911                 wdev->wext.default_key = -1;
 912                 wdev->wext.default_mgmt_key = -1;
 913                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 914 #endif
 915
 916                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
 917                         wdev->ps = true;
 918                 else
 919                         wdev->ps = false;
 920                 /* allow mac80211 to determine the timeout */
 921                 wdev->ps_timeout = -1;
 922
 923                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 924                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
 925                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
 926                         dev->priv_flags |= IFF_DONT_BRIDGE;
 927                 break;
 928         case NETDEV_GOING_DOWN:
 929                 cfg80211_leave(rdev, wdev);
 930                 break;
 931         case NETDEV_DOWN:
 932                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
 933                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 934                         if (WARN_ON(!rdev->scan_req->notified))
 935                                 rdev->scan_req->aborted = true;
 936                         ___cfg80211_scan_done(rdev, false);
 937                 }
 938
 939                 if (WARN_ON(rdev->sched_scan_req &&
 940                             rdev->sched_scan_req->dev == wdev->netdev)) {
 941                         __cfg80211_stop_sched_scan(rdev, false);
 942                 }
 943
 944                 rdev->opencount--;
 945                 wake_up(&rdev->dev_wait);
 946                 break;
 947         case NETDEV_UP:
 948                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
 949                 wdev_lock(wdev);
 950                 switch (wdev->iftype) {
 951 #ifdef CONFIG_CFG80211_WEXT
 952                 case NL80211_IFTYPE_ADHOC:
 953                         cfg80211_ibss_wext_join(rdev, wdev);
 954                         break;
 955                 case NL80211_IFTYPE_STATION:
 956                         cfg80211_mgd_wext_connect(rdev, wdev);
 957                         break;
 958 #endif
 959 #ifdef CONFIG_MAC80211_MESH
 960                 case NL80211_IFTYPE_MESH_POINT:
 961                         {
 962                                 /* backward compat code... */
 963                                 struct mesh_setup setup;
 964                                 memcpy(&setup, &default_mesh_setup,
 965                                                 sizeof(setup));
 966                                  /* back compat only needed for mesh_id */
 967                                 setup.mesh_id = wdev->ssid;
 968                                 setup.mesh_id_len = wdev->mesh_id_up_len;
 969                                 if (wdev->mesh_id_up_len)
 970                                         __cfg80211_join_mesh(rdev, dev,
 971                                                         &setup,
 972                                                         &default_mesh_config);
 973                                 break;
 974                         }
 975 #endif
 976                 default:
 977                         break;
 978                 }
 979                 wdev_unlock(wdev);
 980                 rdev->opencount++;
 981
 982                 /*
 983                  * Configure power management to the driver here so that its
 984                  * correctly set also after interface type changes etc.
 985                  */
 986                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 987                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
 988                     rdev->ops->set_power_mgmt)
 989                         if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
 990                                                 wdev->ps_timeout)) {
 991                                 /* assume this means it's off */
 992                                 wdev->ps = false;
 993                         }
 994                 break;
 995         case NETDEV_UNREGISTER:
 996                 /*
 997                  * It is possible to get NETDEV_UNREGISTER
 998                  * multiple times. To detect that, check
 999                  * that the interface is still on the list
1000                  * of registered interfaces, and only then
1001                  * remove and clean it up.
1002                  */
1003                 if (!list_empty(&wdev->list)) {
1004                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1005                         list_del_rcu(&wdev->list);
1006                         rdev->devlist_generation++;
1007                         cfg80211_mlme_purge_registrations(wdev);
1008 #ifdef CONFIG_CFG80211_WEXT
1009                         kzfree(wdev->wext.keys);
1010 #endif
1011                 }
1012                 /*
1013                  * synchronise (so that we won't find this netdev
1014                  * from other code any more) and then clear the list
1015                  * head so that the above code can safely check for
1016                  * !list_empty() to avoid double-cleanup.
1017                  */
1018                 synchronize_rcu();
1019                 INIT_LIST_HEAD(&wdev->list);
1020                 /*
1021                  * Ensure that all events have been processed and
1022                  * freed.
1023                  */
1024                 cfg80211_process_wdev_events(wdev);
1025
1026                 if (WARN_ON(wdev->current_bss)) {
1027                         cfg80211_unhold_bss(wdev->current_bss);
1028                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1029                         wdev->current_bss = NULL;
1030                 }
1031                 break;
1032         case NETDEV_PRE_UP:
1033                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1034                         return notifier_from_errno(-EOPNOTSUPP);
1035                 if (rfkill_blocked(rdev->rfkill))
1036                         return notifier_from_errno(-ERFKILL);
1037                 break;
1038         default:
1039                 return NOTIFY_DONE;
1040         }
1041
1042         return NOTIFY_OK;
1043 }
1044
1045 static struct notifier_block cfg80211_netdev_notifier = {
1046         .notifier_call = cfg80211_netdev_notifier_call,
1047 };
1048
1049 static void __net_exit cfg80211_pernet_exit(struct net *net)
1050 {
1051         struct cfg80211_registered_device *rdev;
1052
1053         rtnl_lock();
1054         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1055                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1056                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1057         }
1058         rtnl_unlock();
1059 }
1060
1061 static struct pernet_operations cfg80211_pernet_ops = {
1062         .exit = cfg80211_pernet_exit,
1063 };
1064
1065 static int __init cfg80211_init(void)
1066 {
1067         int err;
1068
1069         err = register_pernet_device(&cfg80211_pernet_ops);
1070         if (err)
1071                 goto out_fail_pernet;
1072
1073         err = wiphy_sysfs_init();
1074         if (err)
1075                 goto out_fail_sysfs;
1076
1077         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1078         if (err)
1079                 goto out_fail_notifier;
1080
1081         err = nl80211_init();
1082         if (err)
1083                 goto out_fail_nl80211;
1084
1085         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1086
1087         err = regulatory_init();
1088         if (err)
1089                 goto out_fail_reg;
1090
1091         cfg80211_wq = create_singlethread_workqueue("cfg80211");
1092         if (!cfg80211_wq) {
1093                 err = -ENOMEM;
1094                 goto out_fail_wq;
1095         }
1096
1097         return 0;
1098
1099 out_fail_wq:
1100         regulatory_exit();
1101 out_fail_reg:
1102         debugfs_remove(ieee80211_debugfs_dir);
1103 out_fail_nl80211:
1104         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1105 out_fail_notifier:
1106         wiphy_sysfs_exit();
1107 out_fail_sysfs:
1108         unregister_pernet_device(&cfg80211_pernet_ops);
1109 out_fail_pernet:
1110         return err;
1111 }
1112 subsys_initcall(cfg80211_init);
1113
1114 static void __exit cfg80211_exit(void)
1115 {
1116         debugfs_remove(ieee80211_debugfs_dir);
1117         nl80211_exit();
1118         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1119         wiphy_sysfs_exit();
1120         regulatory_exit();
1121         unregister_pernet_device(&cfg80211_pernet_ops);
1122         destroy_workqueue(cfg80211_wq);
1123 }
1124 module_exit(cfg80211_exit);