net/wireless/core.c

   1 /*
   2  * This is the linux wireless configuration interface.
   3  *
   4  * Copyright 2006-2009          Johannes Berg <johannes@sipsolutions.net>
   5  */
   6
   7 #include <linux/if.h>
   8 #include <linux/module.h>
   9 #include <linux/err.h>
  10 #include <linux/list.h>
  11 #include <linux/nl80211.h>
  12 #include <linux/debugfs.h>
  13 #include <linux/notifier.h>
  14 #include <linux/device.h>
  15 #include <linux/rtnetlink.h>
  16 #include <net/genetlink.h>
  17 #include <net/cfg80211.h>
  18 #include "nl80211.h"
  19 #include "core.h"
  20 #include "sysfs.h"
  21 #include "debugfs.h"
  22 #include "wext-compat.h"
  23
  24 /* name for sysfs, %d is appended */
  25 #define PHY_NAME "phy"
  26
  27 MODULE_AUTHOR("Johannes Berg");
  28 MODULE_LICENSE("GPL");
  29 MODULE_DESCRIPTION("wireless configuration support");
  30
  31 /* RCU might be appropriate here since we usually
  32  * only read the list, and that can happen quite
  33  * often because we need to do it for each command */
  34 LIST_HEAD(cfg80211_rdev_list);
  35
  36 /*
  37  * This is used to protect the cfg80211_rdev_list
  38  */
  39 DEFINE_MUTEX(cfg80211_mutex);
  40
  41 /* for debugfs */
  42 static struct dentry *ieee80211_debugfs_dir;
  43
  44 /* requires cfg80211_mutex to be held! */
  45 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  46 {
  47         struct cfg80211_registered_device *result = NULL, *rdev;
  48
  49         if (!wiphy_idx_valid(wiphy_idx))
  50                 return NULL;
  51
  52         assert_cfg80211_lock();
  53
  54         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  55                 if (rdev->wiphy_idx == wiphy_idx) {
  56                         result = rdev;
  57                         break;
  58                 }
  59         }
  60
  61         return result;
  62 }
  63
  64 int get_wiphy_idx(struct wiphy *wiphy)
  65 {
  66         struct cfg80211_registered_device *rdev;
  67         if (!wiphy)
  68                 return WIPHY_IDX_STALE;
  69         rdev = wiphy_to_dev(wiphy);
  70         return rdev->wiphy_idx;
  71 }
  72
  73 /* requires cfg80211_rdev_mutex to be held! */
  74 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  75 {
  76         struct cfg80211_registered_device *rdev;
  77
  78         if (!wiphy_idx_valid(wiphy_idx))
  79                 return NULL;
  80
  81         assert_cfg80211_lock();
  82
  83         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  84         if (!rdev)
  85                 return NULL;
  86         return &rdev->wiphy;
  87 }
  88
  89 /* requires cfg80211_mutex to be held! */
  90 struct cfg80211_registered_device *
  91 __cfg80211_rdev_from_info(struct genl_info *info)
  92 {
  93         int ifindex;
  94         struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
  95         struct net_device *dev;
  96         int err = -EINVAL;
  97
  98         assert_cfg80211_lock();
  99
 100         if (info->attrs[NL80211_ATTR_WIPHY]) {
 101                 bywiphyidx = cfg80211_rdev_by_wiphy_idx(
 102                                 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
 103                 err = -ENODEV;
 104         }
 105
 106         if (info->attrs[NL80211_ATTR_IFINDEX]) {
 107                 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
 108                 dev = dev_get_by_index(genl_info_net(info), ifindex);
 109                 if (dev) {
 110                         if (dev->ieee80211_ptr)
 111                                 byifidx =
 112                                         wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 113                         dev_put(dev);
 114                 }
 115                 err = -ENODEV;
 116         }
 117
 118         if (bywiphyidx && byifidx) {
 119                 if (bywiphyidx != byifidx)
 120                         return ERR_PTR(-EINVAL);
 121                 else
 122                         return bywiphyidx; /* == byifidx */
 123         }
 124         if (bywiphyidx)
 125                 return bywiphyidx;
 126
 127         if (byifidx)
 128                 return byifidx;
 129
 130         return ERR_PTR(err);
 131 }
 132
 133 struct cfg80211_registered_device *
 134 cfg80211_get_dev_from_info(struct genl_info *info)
 135 {
 136         struct cfg80211_registered_device *rdev;
 137
 138         mutex_lock(&cfg80211_mutex);
 139         rdev = __cfg80211_rdev_from_info(info);
 140
 141         /* if it is not an error we grab the lock on
 142          * it to assure it won't be going away while
 143          * we operate on it */
 144         if (!IS_ERR(rdev))
 145                 mutex_lock(&rdev->mtx);
 146
 147         mutex_unlock(&cfg80211_mutex);
 148
 149         return rdev;
 150 }
 151
 152 struct cfg80211_registered_device *
 153 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
 154 {
 155         struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
 156         struct net_device *dev;
 157
 158         mutex_lock(&cfg80211_mutex);
 159         dev = dev_get_by_index(net, ifindex);
 160         if (!dev)
 161                 goto out;
 162         if (dev->ieee80211_ptr) {
 163                 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 164                 mutex_lock(&rdev->mtx);
 165         } else
 166                 rdev = ERR_PTR(-ENODEV);
 167         dev_put(dev);
 168  out:
 169         mutex_unlock(&cfg80211_mutex);
 170         return rdev;
 171 }
 172
 173 /* requires cfg80211_mutex to be held */
 174 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 175                         char *newname)
 176 {
 177         struct cfg80211_registered_device *rdev2;
 178         int wiphy_idx, taken = -1, result, digits;
 179
 180         assert_cfg80211_lock();
 181
 182         /* prohibit calling the thing phy%d when %d is not its number */
 183         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 184         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 185                 /* count number of places needed to print wiphy_idx */
 186                 digits = 1;
 187                 while (wiphy_idx /= 10)
 188                         digits++;
 189                 /*
 190                  * deny the name if it is phy<idx> where <idx> is printed
 191                  * without leading zeroes. taken == strlen(newname) here
 192                  */
 193                 if (taken == strlen(PHY_NAME) + digits)
 194                         return -EINVAL;
 195         }
 196
 197
 198         /* Ignore nop renames */
 199         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
 200                 return 0;
 201
 202         /* Ensure another device does not already have this name. */
 203         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 204                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
 205                         return -EINVAL;
 206
 207         result = device_rename(&rdev->wiphy.dev, newname);
 208         if (result)
 209                 return result;
 210
 211         if (rdev->wiphy.debugfsdir &&
 212             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 213                             rdev->wiphy.debugfsdir,
 214                             rdev->wiphy.debugfsdir->d_parent,
 215                             newname))
 216                 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
 217                        newname);
 218
 219         nl80211_notify_dev_rename(rdev);
 220
 221         return 0;
 222 }
 223
 224 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 225                           struct net *net)
 226 {
 227         struct wireless_dev *wdev;
 228         int err = 0;
 229
 230         if (!rdev->wiphy.netnsok)
 231                 return -EOPNOTSUPP;
 232
 233         list_for_each_entry(wdev, &rdev->netdev_list, list) {
 234                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 235                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 236                 if (err)
 237                         break;
 238                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 239         }
 240
 241         if (err) {
 242                 /* failed -- clean up to old netns */
 243                 net = wiphy_net(&rdev->wiphy);
 244
 245                 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
 246                                                      list) {
 247                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 248                         err = dev_change_net_namespace(wdev->netdev, net,
 249                                                         "wlan%d");
 250                         WARN_ON(err);
 251                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 252                 }
 253         }
 254
 255         wiphy_net_set(&rdev->wiphy, net);
 256
 257         return err;
 258 }
 259
 260 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 261 {
 262         struct cfg80211_registered_device *rdev = data;
 263
 264         rdev->ops->rfkill_poll(&rdev->wiphy);
 265 }
 266
 267 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 268 {
 269         struct cfg80211_registered_device *rdev = data;
 270         struct wireless_dev *wdev;
 271
 272         if (!blocked)
 273                 return 0;
 274
 275         rtnl_lock();
 276         mutex_lock(&rdev->devlist_mtx);
 277
 278         list_for_each_entry(wdev, &rdev->netdev_list, list)
 279                 dev_close(wdev->netdev);
 280
 281         mutex_unlock(&rdev->devlist_mtx);
 282         rtnl_unlock();
 283
 284         return 0;
 285 }
 286
 287 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 288 {
 289         struct cfg80211_registered_device *rdev;
 290
 291         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 292         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 293 }
 294
 295 static void cfg80211_process_events(struct wireless_dev *wdev)
 296 {
 297         struct cfg80211_event *ev;
 298         unsigned long flags;
 299
 300         spin_lock_irqsave(&wdev->event_lock, flags);
 301         while (!list_empty(&wdev->event_list)) {
 302                 ev = list_first_entry(&wdev->event_list,
 303                                       struct cfg80211_event, list);
 304                 list_del(&ev->list);
 305                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 306
 307                 wdev_lock(wdev);
 308                 switch (ev->type) {
 309                 case EVENT_CONNECT_RESULT:
 310                         __cfg80211_connect_result(
 311                                 wdev->netdev, ev->cr.bssid,
 312                                 ev->cr.req_ie, ev->cr.req_ie_len,
 313                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
 314                                 ev->cr.status,
 315                                 ev->cr.status == WLAN_STATUS_SUCCESS,
 316                                 NULL);
 317                         break;
 318                 case EVENT_ROAMED:
 319                         __cfg80211_roamed(wdev, ev->rm.bssid,
 320                                           ev->rm.req_ie, ev->rm.req_ie_len,
 321                                           ev->rm.resp_ie, ev->rm.resp_ie_len);
 322                         break;
 323                 case EVENT_DISCONNECTED:
 324                         __cfg80211_disconnected(wdev->netdev,
 325                                                 ev->dc.ie, ev->dc.ie_len,
 326                                                 ev->dc.reason, true);
 327                         break;
 328                 case EVENT_IBSS_JOINED:
 329                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
 330                         break;
 331                 }
 332                 wdev_unlock(wdev);
 333
 334                 kfree(ev);
 335
 336                 spin_lock_irqsave(&wdev->event_lock, flags);
 337         }
 338         spin_unlock_irqrestore(&wdev->event_lock, flags);
 339 }
 340
 341 static void cfg80211_event_work(struct work_struct *work)
 342 {
 343         struct cfg80211_registered_device *rdev;
 344         struct wireless_dev *wdev;
 345
 346         rdev = container_of(work, struct cfg80211_registered_device,
 347                             event_work);
 348
 349         rtnl_lock();
 350         cfg80211_lock_rdev(rdev);
 351         mutex_lock(&rdev->devlist_mtx);
 352
 353         list_for_each_entry(wdev, &rdev->netdev_list, list)
 354                 cfg80211_process_events(wdev);
 355
 356         mutex_unlock(&rdev->devlist_mtx);
 357         cfg80211_unlock_rdev(rdev);
 358         rtnl_unlock();
 359 }
 360
 361 /* exported functions */
 362
 363 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 364 {
 365         static int wiphy_counter;
 366
 367         struct cfg80211_registered_device *rdev;
 368         int alloc_size;
 369
 370         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 371         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 372         WARN_ON(ops->connect && !ops->disconnect);
 373         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 374         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 375         WARN_ON(ops->add_station && !ops->del_station);
 376         WARN_ON(ops->add_mpath && !ops->del_mpath);
 377
 378         alloc_size = sizeof(*rdev) + sizeof_priv;
 379
 380         rdev = kzalloc(alloc_size, GFP_KERNEL);
 381         if (!rdev)
 382                 return NULL;
 383
 384         rdev->ops = ops;
 385
 386         mutex_lock(&cfg80211_mutex);
 387
 388         rdev->wiphy_idx = wiphy_counter++;
 389
 390         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
 391                 wiphy_counter--;
 392                 mutex_unlock(&cfg80211_mutex);
 393                 /* ugh, wrapped! */
 394                 kfree(rdev);
 395                 return NULL;
 396         }
 397
 398         mutex_unlock(&cfg80211_mutex);
 399
 400         /* give it a proper name */
 401         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 402
 403         mutex_init(&rdev->mtx);
 404         mutex_init(&rdev->devlist_mtx);
 405         INIT_LIST_HEAD(&rdev->netdev_list);
 406         spin_lock_init(&rdev->bss_lock);
 407         INIT_LIST_HEAD(&rdev->bss_list);
 408         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 409
 410         device_initialize(&rdev->wiphy.dev);
 411         rdev->wiphy.dev.class = &ieee80211_class;
 412         rdev->wiphy.dev.platform_data = rdev;
 413
 414         wiphy_net_set(&rdev->wiphy, &init_net);
 415
 416         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 417         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 418                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 419                                    &rdev->rfkill_ops, rdev);
 420
 421         if (!rdev->rfkill) {
 422                 kfree(rdev);
 423                 return NULL;
 424         }
 425
 426         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 427         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 428         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 429
 430         /*
 431          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 432          * Fragmentation and RTS threshold are disabled by default with the
 433          * special -1 value.
 434          */
 435         rdev->wiphy.retry_short = 7;
 436         rdev->wiphy.retry_long = 4;
 437         rdev->wiphy.frag_threshold = (u32) -1;
 438         rdev->wiphy.rts_threshold = (u32) -1;
 439
 440         return &rdev->wiphy;
 441 }
 442 EXPORT_SYMBOL(wiphy_new);
 443
 444 int wiphy_register(struct wiphy *wiphy)
 445 {
 446         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 447         int res;
 448         enum ieee80211_band band;
 449         struct ieee80211_supported_band *sband;
 450         bool have_band = false;
 451         int i;
 452         u16 ifmodes = wiphy->interface_modes;
 453
 454         /* sanity check ifmodes */
 455         WARN_ON(!ifmodes);
 456         ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
 457         if (WARN_ON(ifmodes != wiphy->interface_modes))
 458                 wiphy->interface_modes = ifmodes;
 459
 460         /* sanity check supported bands/channels */
 461         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 462                 sband = wiphy->bands[band];
 463                 if (!sband)
 464                         continue;
 465
 466                 sband->band = band;
 467
 468                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
 469                         return -EINVAL;
 470
 471                 /*
 472                  * Since we use a u32 for rate bitmaps in
 473                  * ieee80211_get_response_rate, we cannot
 474                  * have more than 32 legacy rates.
 475                  */
 476                 if (WARN_ON(sband->n_bitrates > 32))
 477                         return -EINVAL;
 478
 479                 for (i = 0; i < sband->n_channels; i++) {
 480                         sband->channels[i].orig_flags =
 481                                 sband->channels[i].flags;
 482                         sband->channels[i].orig_mag =
 483                                 sband->channels[i].max_antenna_gain;
 484                         sband->channels[i].orig_mpwr =
 485                                 sband->channels[i].max_power;
 486                         sband->channels[i].band = band;
 487                 }
 488
 489                 have_band = true;
 490         }
 491
 492         if (!have_band) {
 493                 WARN_ON(1);
 494                 return -EINVAL;
 495         }
 496
 497         /* check and set up bitrates */
 498         ieee80211_set_bitrate_flags(wiphy);
 499
 500         res = device_add(&rdev->wiphy.dev);
 501         if (res)
 502                 return res;
 503
 504         res = rfkill_register(rdev->rfkill);
 505         if (res)
 506                 goto out_rm_dev;
 507
 508         mutex_lock(&cfg80211_mutex);
 509
 510         /* set up regulatory info */
 511         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
 512
 513         list_add(&rdev->list, &cfg80211_rdev_list);
 514
 515         mutex_unlock(&cfg80211_mutex);
 516
 517         /* add to debugfs */
 518         rdev->wiphy.debugfsdir =
 519                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 520                                    ieee80211_debugfs_dir);
 521         if (IS_ERR(rdev->wiphy.debugfsdir))
 522                 rdev->wiphy.debugfsdir = NULL;
 523
 524         if (wiphy->custom_regulatory) {
 525                 struct regulatory_request request;
 526
 527                 request.wiphy_idx = get_wiphy_idx(wiphy);
 528                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 529                 request.alpha2[0] = '9';
 530                 request.alpha2[1] = '9';
 531
 532                 nl80211_send_reg_change_event(&request);
 533         }
 534
 535         cfg80211_debugfs_rdev_add(rdev);
 536
 537         return 0;
 538
 539  out_rm_dev:
 540         device_del(&rdev->wiphy.dev);
 541         return res;
 542 }
 543 EXPORT_SYMBOL(wiphy_register);
 544
 545 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 546 {
 547         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 548
 549         if (!rdev->ops->rfkill_poll)
 550                 return;
 551         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 552         rfkill_resume_polling(rdev->rfkill);
 553 }
 554 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 555
 556 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 557 {
 558         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 559
 560         rfkill_pause_polling(rdev->rfkill);
 561 }
 562 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 563
 564 void wiphy_unregister(struct wiphy *wiphy)
 565 {
 566         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 567
 568         rfkill_unregister(rdev->rfkill);
 569
 570         /* protect the device list */
 571         mutex_lock(&cfg80211_mutex);
 572
 573         BUG_ON(!list_empty(&rdev->netdev_list));
 574
 575         /*
 576          * Try to grab rdev->mtx. If a command is still in progress,
 577          * hopefully the driver will refuse it since it's tearing
 578          * down the device already. We wait for this command to complete
 579          * before unlinking the item from the list.
 580          * Note: as codified by the BUG_ON above we cannot get here if
 581          * a virtual interface is still associated. Hence, we can only
 582          * get to lock contention here if userspace issues a command
 583          * that identified the hardware by wiphy index.
 584          */
 585         mutex_lock(&rdev->mtx);
 586         /* unlock again before freeing */
 587         mutex_unlock(&rdev->mtx);
 588
 589         cfg80211_debugfs_rdev_del(rdev);
 590
 591         /* If this device got a regulatory hint tell core its
 592          * free to listen now to a new shiny device regulatory hint */
 593         reg_device_remove(wiphy);
 594
 595         list_del(&rdev->list);
 596         device_del(&rdev->wiphy.dev);
 597         debugfs_remove(rdev->wiphy.debugfsdir);
 598
 599         mutex_unlock(&cfg80211_mutex);
 600
 601         cancel_work_sync(&rdev->conn_work);
 602         cancel_work_sync(&rdev->scan_done_wk);
 603         kfree(rdev->scan_req);
 604         flush_work(&rdev->event_work);
 605 }
 606 EXPORT_SYMBOL(wiphy_unregister);
 607
 608 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 609 {
 610         struct cfg80211_internal_bss *scan, *tmp;
 611         rfkill_destroy(rdev->rfkill);
 612         mutex_destroy(&rdev->mtx);
 613         mutex_destroy(&rdev->devlist_mtx);
 614         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 615                 cfg80211_put_bss(&scan->pub);
 616         kfree(rdev);
 617 }
 618
 619 void wiphy_free(struct wiphy *wiphy)
 620 {
 621         put_device(&wiphy->dev);
 622 }
 623 EXPORT_SYMBOL(wiphy_free);
 624
 625 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 626 {
 627         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 628
 629         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 630                 schedule_work(&rdev->rfkill_sync);
 631 }
 632 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 633
 634 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
 635                                          unsigned long state,
 636                                          void *ndev)
 637 {
 638         struct net_device *dev = ndev;
 639         struct wireless_dev *wdev = dev->ieee80211_ptr;
 640         struct cfg80211_registered_device *rdev;
 641
 642         if (!wdev)
 643                 return NOTIFY_DONE;
 644
 645         rdev = wiphy_to_dev(wdev->wiphy);
 646
 647         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 648
 649         switch (state) {
 650         case NETDEV_REGISTER:
 651                 mutex_init(&wdev->mtx);
 652                 INIT_LIST_HEAD(&wdev->event_list);
 653                 spin_lock_init(&wdev->event_lock);
 654                 mutex_lock(&rdev->devlist_mtx);
 655                 list_add(&wdev->list, &rdev->netdev_list);
 656                 /* can only change netns with wiphy */
 657                 dev->features |= NETIF_F_NETNS_LOCAL;
 658
 659                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 660                                       "phy80211")) {
 661                         printk(KERN_ERR "wireless: failed to add phy80211 "
 662                                 "symlink to netdev!\n");
 663                 }
 664                 wdev->netdev = dev;
 665                 wdev->sme_state = CFG80211_SME_IDLE;
 666                 mutex_unlock(&rdev->devlist_mtx);
 667 #ifdef CONFIG_WIRELESS_EXT
 668                 if (!dev->wireless_handlers)
 669                         dev->wireless_handlers = &cfg80211_wext_handler;
 670                 wdev->wext.default_key = -1;
 671                 wdev->wext.default_mgmt_key = -1;
 672                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 673                 wdev->wext.ps = CONFIG_CFG80211_DEFAULT_PS_VALUE;
 674                 wdev->wext.ps_timeout = 500;
 675                 if (rdev->ops->set_power_mgmt)
 676                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
 677                                                       wdev->wext.ps,
 678                                                       wdev->wext.ps_timeout)) {
 679                                 /* assume this means it's off */
 680                                 wdev->wext.ps = false;
 681                         }
 682 #endif
 683                 break;
 684         case NETDEV_GOING_DOWN:
 685                 switch (wdev->iftype) {
 686                 case NL80211_IFTYPE_ADHOC:
 687                         cfg80211_leave_ibss(rdev, dev, true);
 688                         break;
 689                 case NL80211_IFTYPE_STATION:
 690                         wdev_lock(wdev);
 691 #ifdef CONFIG_WIRELESS_EXT
 692                         kfree(wdev->wext.ie);
 693                         wdev->wext.ie = NULL;
 694                         wdev->wext.ie_len = 0;
 695                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 696 #endif
 697                         __cfg80211_disconnect(rdev, dev,
 698                                               WLAN_REASON_DEAUTH_LEAVING, true);
 699                         cfg80211_mlme_down(rdev, dev);
 700                         wdev_unlock(wdev);
 701                         break;
 702                 default:
 703                         break;
 704                 }
 705                 break;
 706         case NETDEV_UP:
 707 #ifdef CONFIG_WIRELESS_EXT
 708                 cfg80211_lock_rdev(rdev);
 709                 wdev_lock(wdev);
 710                 switch (wdev->iftype) {
 711                 case NL80211_IFTYPE_ADHOC:
 712                         cfg80211_ibss_wext_join(rdev, wdev);
 713                         break;
 714                 case NL80211_IFTYPE_STATION:
 715                         cfg80211_mgd_wext_connect(rdev, wdev);
 716                         break;
 717                 default:
 718                         break;
 719                 }
 720                 wdev_unlock(wdev);
 721                 cfg80211_unlock_rdev(rdev);
 722 #endif
 723                 break;
 724         case NETDEV_UNREGISTER:
 725                 mutex_lock(&rdev->devlist_mtx);
 726                 /*
 727                  * It is possible to get NETDEV_UNREGISTER
 728                  * multiple times. To detect that, check
 729                  * that the interface is still on the list
 730                  * of registered interfaces, and only then
 731                  * remove and clean it up.
 732                  */
 733                 if (!list_empty(&wdev->list)) {
 734                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 735                         list_del_init(&wdev->list);
 736                         mutex_destroy(&wdev->mtx);
 737 #ifdef CONFIG_WIRELESS_EXT
 738                         kfree(wdev->wext.keys);
 739 #endif
 740                 }
 741                 mutex_unlock(&rdev->devlist_mtx);
 742                 break;
 743         case NETDEV_PRE_UP:
 744                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 745                         return notifier_from_errno(-EOPNOTSUPP);
 746                 if (rfkill_blocked(rdev->rfkill))
 747                         return notifier_from_errno(-ERFKILL);
 748                 break;
 749         }
 750
 751         return NOTIFY_DONE;
 752 }
 753
 754 static struct notifier_block cfg80211_netdev_notifier = {
 755         .notifier_call = cfg80211_netdev_notifier_call,
 756 };
 757
 758 static void __net_exit cfg80211_pernet_exit(struct net *net)
 759 {
 760         struct cfg80211_registered_device *rdev;
 761
 762         rtnl_lock();
 763         mutex_lock(&cfg80211_mutex);
 764         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 765                 if (net_eq(wiphy_net(&rdev->wiphy), net))
 766                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
 767         }
 768         mutex_unlock(&cfg80211_mutex);
 769         rtnl_unlock();
 770 }
 771
 772 static struct pernet_operations cfg80211_pernet_ops = {
 773         .exit = cfg80211_pernet_exit,
 774 };
 775
 776 static int __init cfg80211_init(void)
 777 {
 778         int err;
 779
 780         err = register_pernet_device(&cfg80211_pernet_ops);
 781         if (err)
 782                 goto out_fail_pernet;
 783
 784         err = wiphy_sysfs_init();
 785         if (err)
 786                 goto out_fail_sysfs;
 787
 788         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
 789         if (err)
 790                 goto out_fail_notifier;
 791
 792         err = nl80211_init();
 793         if (err)
 794                 goto out_fail_nl80211;
 795
 796         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
 797
 798         err = regulatory_init();
 799         if (err)
 800                 goto out_fail_reg;
 801
 802         return 0;
 803
 804 out_fail_reg:
 805         debugfs_remove(ieee80211_debugfs_dir);
 806 out_fail_nl80211:
 807         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 808 out_fail_notifier:
 809         wiphy_sysfs_exit();
 810 out_fail_sysfs:
 811         unregister_pernet_device(&cfg80211_pernet_ops);
 812 out_fail_pernet:
 813         return err;
 814 }
 815 subsys_initcall(cfg80211_init);
 816
 817 static void cfg80211_exit(void)
 818 {
 819         debugfs_remove(ieee80211_debugfs_dir);
 820         nl80211_exit();
 821         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 822         wiphy_sysfs_exit();
 823         regulatory_exit();
 824         unregister_pernet_device(&cfg80211_pernet_ops);
 825 }
 826 module_exit(cfg80211_exit);