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/etherdevice.h>
  16 #include <linux/rtnetlink.h>
  17 #include <linux/sched.h>
  18 #include <net/genetlink.h>
  19 #include <net/cfg80211.h>
  20 #include "nl80211.h"
  21 #include "core.h"
  22 #include "sysfs.h"
  23 #include "debugfs.h"
  24 #include "wext-compat.h"
  25
  26 /* name for sysfs, %d is appended */
  27 #define PHY_NAME "phy"
  28
  29 MODULE_AUTHOR("Johannes Berg");
  30 MODULE_LICENSE("GPL");
  31 MODULE_DESCRIPTION("wireless configuration support");
  32
  33 /* RCU might be appropriate here since we usually
  34  * only read the list, and that can happen quite
  35  * often because we need to do it for each command */
  36 LIST_HEAD(cfg80211_rdev_list);
  37 int cfg80211_rdev_list_generation;
  38
  39 /*
  40  * This is used to protect the cfg80211_rdev_list
  41  */
  42 DEFINE_MUTEX(cfg80211_mutex);
  43
  44 /* for debugfs */
  45 static struct dentry *ieee80211_debugfs_dir;
  46
  47 /* requires cfg80211_mutex to be held! */
  48 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  49 {
  50         struct cfg80211_registered_device *result = NULL, *rdev;
  51
  52         if (!wiphy_idx_valid(wiphy_idx))
  53                 return NULL;
  54
  55         assert_cfg80211_lock();
  56
  57         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  58                 if (rdev->wiphy_idx == wiphy_idx) {
  59                         result = rdev;
  60                         break;
  61                 }
  62         }
  63
  64         return result;
  65 }
  66
  67 int get_wiphy_idx(struct wiphy *wiphy)
  68 {
  69         struct cfg80211_registered_device *rdev;
  70         if (!wiphy)
  71                 return WIPHY_IDX_STALE;
  72         rdev = wiphy_to_dev(wiphy);
  73         return rdev->wiphy_idx;
  74 }
  75
  76 /* requires cfg80211_rdev_mutex to be held! */
  77 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  78 {
  79         struct cfg80211_registered_device *rdev;
  80
  81         if (!wiphy_idx_valid(wiphy_idx))
  82                 return NULL;
  83
  84         assert_cfg80211_lock();
  85
  86         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  87         if (!rdev)
  88                 return NULL;
  89         return &rdev->wiphy;
  90 }
  91
  92 /* requires cfg80211_mutex to be held! */
  93 struct cfg80211_registered_device *
  94 __cfg80211_rdev_from_info(struct genl_info *info)
  95 {
  96         int ifindex;
  97         struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
  98         struct net_device *dev;
  99         int err = -EINVAL;
 100
 101         assert_cfg80211_lock();
 102
 103         if (info->attrs[NL80211_ATTR_WIPHY]) {
 104                 bywiphyidx = cfg80211_rdev_by_wiphy_idx(
 105                                 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
 106                 err = -ENODEV;
 107         }
 108
 109         if (info->attrs[NL80211_ATTR_IFINDEX]) {
 110                 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
 111                 dev = dev_get_by_index(genl_info_net(info), ifindex);
 112                 if (dev) {
 113                         if (dev->ieee80211_ptr)
 114                                 byifidx =
 115                                         wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 116                         dev_put(dev);
 117                 }
 118                 err = -ENODEV;
 119         }
 120
 121         if (bywiphyidx && byifidx) {
 122                 if (bywiphyidx != byifidx)
 123                         return ERR_PTR(-EINVAL);
 124                 else
 125                         return bywiphyidx; /* == byifidx */
 126         }
 127         if (bywiphyidx)
 128                 return bywiphyidx;
 129
 130         if (byifidx)
 131                 return byifidx;
 132
 133         return ERR_PTR(err);
 134 }
 135
 136 struct cfg80211_registered_device *
 137 cfg80211_get_dev_from_info(struct genl_info *info)
 138 {
 139         struct cfg80211_registered_device *rdev;
 140
 141         mutex_lock(&cfg80211_mutex);
 142         rdev = __cfg80211_rdev_from_info(info);
 143
 144         /* if it is not an error we grab the lock on
 145          * it to assure it won't be going away while
 146          * we operate on it */
 147         if (!IS_ERR(rdev))
 148                 mutex_lock(&rdev->mtx);
 149
 150         mutex_unlock(&cfg80211_mutex);
 151
 152         return rdev;
 153 }
 154
 155 struct cfg80211_registered_device *
 156 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
 157 {
 158         struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
 159         struct net_device *dev;
 160
 161         mutex_lock(&cfg80211_mutex);
 162         dev = dev_get_by_index(net, ifindex);
 163         if (!dev)
 164                 goto out;
 165         if (dev->ieee80211_ptr) {
 166                 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 167                 mutex_lock(&rdev->mtx);
 168         } else
 169                 rdev = ERR_PTR(-ENODEV);
 170         dev_put(dev);
 171  out:
 172         mutex_unlock(&cfg80211_mutex);
 173         return rdev;
 174 }
 175
 176 /* requires cfg80211_mutex to be held */
 177 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 178                         char *newname)
 179 {
 180         struct cfg80211_registered_device *rdev2;
 181         int wiphy_idx, taken = -1, result, digits;
 182
 183         assert_cfg80211_lock();
 184
 185         /* prohibit calling the thing phy%d when %d is not its number */
 186         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 187         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 188                 /* count number of places needed to print wiphy_idx */
 189                 digits = 1;
 190                 while (wiphy_idx /= 10)
 191                         digits++;
 192                 /*
 193                  * deny the name if it is phy<idx> where <idx> is printed
 194                  * without leading zeroes. taken == strlen(newname) here
 195                  */
 196                 if (taken == strlen(PHY_NAME) + digits)
 197                         return -EINVAL;
 198         }
 199
 200
 201         /* Ignore nop renames */
 202         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
 203                 return 0;
 204
 205         /* Ensure another device does not already have this name. */
 206         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 207                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
 208                         return -EINVAL;
 209
 210         result = device_rename(&rdev->wiphy.dev, newname);
 211         if (result)
 212                 return result;
 213
 214         if (rdev->wiphy.debugfsdir &&
 215             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 216                             rdev->wiphy.debugfsdir,
 217                             rdev->wiphy.debugfsdir->d_parent,
 218                             newname))
 219                 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
 220                        newname);
 221
 222         nl80211_notify_dev_rename(rdev);
 223
 224         return 0;
 225 }
 226
 227 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 228                           struct net *net)
 229 {
 230         struct wireless_dev *wdev;
 231         int err = 0;
 232
 233         if (!rdev->wiphy.netnsok)
 234                 return -EOPNOTSUPP;
 235
 236         list_for_each_entry(wdev, &rdev->netdev_list, list) {
 237                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 238                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 239                 if (err)
 240                         break;
 241                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 242         }
 243
 244         if (err) {
 245                 /* failed -- clean up to old netns */
 246                 net = wiphy_net(&rdev->wiphy);
 247
 248                 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
 249                                                      list) {
 250                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 251                         err = dev_change_net_namespace(wdev->netdev, net,
 252                                                         "wlan%d");
 253                         WARN_ON(err);
 254                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 255                 }
 256         }
 257
 258         wiphy_net_set(&rdev->wiphy, net);
 259
 260         return err;
 261 }
 262
 263 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 264 {
 265         struct cfg80211_registered_device *rdev = data;
 266
 267         rdev->ops->rfkill_poll(&rdev->wiphy);
 268 }
 269
 270 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 271 {
 272         struct cfg80211_registered_device *rdev = data;
 273         struct wireless_dev *wdev;
 274
 275         if (!blocked)
 276                 return 0;
 277
 278         rtnl_lock();
 279         mutex_lock(&rdev->devlist_mtx);
 280
 281         list_for_each_entry(wdev, &rdev->netdev_list, list)
 282                 dev_close(wdev->netdev);
 283
 284         mutex_unlock(&rdev->devlist_mtx);
 285         rtnl_unlock();
 286
 287         return 0;
 288 }
 289
 290 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 291 {
 292         struct cfg80211_registered_device *rdev;
 293
 294         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 295         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 296 }
 297
 298 static void cfg80211_event_work(struct work_struct *work)
 299 {
 300         struct cfg80211_registered_device *rdev;
 301
 302         rdev = container_of(work, struct cfg80211_registered_device,
 303                             event_work);
 304
 305         rtnl_lock();
 306         cfg80211_lock_rdev(rdev);
 307
 308         cfg80211_process_rdev_events(rdev);
 309         cfg80211_unlock_rdev(rdev);
 310         rtnl_unlock();
 311 }
 312
 313 /* exported functions */
 314
 315 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 316 {
 317         static int wiphy_counter;
 318
 319         struct cfg80211_registered_device *rdev;
 320         int alloc_size;
 321
 322         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 323         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 324         WARN_ON(ops->connect && !ops->disconnect);
 325         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 326         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 327         WARN_ON(ops->add_station && !ops->del_station);
 328         WARN_ON(ops->add_mpath && !ops->del_mpath);
 329
 330         alloc_size = sizeof(*rdev) + sizeof_priv;
 331
 332         rdev = kzalloc(alloc_size, GFP_KERNEL);
 333         if (!rdev)
 334                 return NULL;
 335
 336         rdev->ops = ops;
 337
 338         mutex_lock(&cfg80211_mutex);
 339
 340         rdev->wiphy_idx = wiphy_counter++;
 341
 342         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
 343                 wiphy_counter--;
 344                 mutex_unlock(&cfg80211_mutex);
 345                 /* ugh, wrapped! */
 346                 kfree(rdev);
 347                 return NULL;
 348         }
 349
 350         mutex_unlock(&cfg80211_mutex);
 351
 352         /* give it a proper name */
 353         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 354
 355         mutex_init(&rdev->mtx);
 356         mutex_init(&rdev->devlist_mtx);
 357         INIT_LIST_HEAD(&rdev->netdev_list);
 358         spin_lock_init(&rdev->bss_lock);
 359         INIT_LIST_HEAD(&rdev->bss_list);
 360         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 361
 362         device_initialize(&rdev->wiphy.dev);
 363         rdev->wiphy.dev.class = &ieee80211_class;
 364         rdev->wiphy.dev.platform_data = rdev;
 365
 366         rdev->wiphy.ps_default = CONFIG_CFG80211_DEFAULT_PS_VALUE;
 367
 368         wiphy_net_set(&rdev->wiphy, &init_net);
 369
 370         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 371         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 372                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 373                                    &rdev->rfkill_ops, rdev);
 374
 375         if (!rdev->rfkill) {
 376                 kfree(rdev);
 377                 return NULL;
 378         }
 379
 380         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 381         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 382         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 383
 384         init_waitqueue_head(&rdev->dev_wait);
 385
 386         /*
 387          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 388          * Fragmentation and RTS threshold are disabled by default with the
 389          * special -1 value.
 390          */
 391         rdev->wiphy.retry_short = 7;
 392         rdev->wiphy.retry_long = 4;
 393         rdev->wiphy.frag_threshold = (u32) -1;
 394         rdev->wiphy.rts_threshold = (u32) -1;
 395
 396         return &rdev->wiphy;
 397 }
 398 EXPORT_SYMBOL(wiphy_new);
 399
 400 int wiphy_register(struct wiphy *wiphy)
 401 {
 402         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 403         int res;
 404         enum ieee80211_band band;
 405         struct ieee80211_supported_band *sband;
 406         bool have_band = false;
 407         int i;
 408         u16 ifmodes = wiphy->interface_modes;
 409
 410         /* sanity check ifmodes */
 411         WARN_ON(!ifmodes);
 412         ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
 413         if (WARN_ON(ifmodes != wiphy->interface_modes))
 414                 wiphy->interface_modes = ifmodes;
 415
 416         /* sanity check supported bands/channels */
 417         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 418                 sband = wiphy->bands[band];
 419                 if (!sband)
 420                         continue;
 421
 422                 sband->band = band;
 423
 424                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
 425                         return -EINVAL;
 426
 427                 /*
 428                  * Since we use a u32 for rate bitmaps in
 429                  * ieee80211_get_response_rate, we cannot
 430                  * have more than 32 legacy rates.
 431                  */
 432                 if (WARN_ON(sband->n_bitrates > 32))
 433                         return -EINVAL;
 434
 435                 for (i = 0; i < sband->n_channels; i++) {
 436                         sband->channels[i].orig_flags =
 437                                 sband->channels[i].flags;
 438                         sband->channels[i].orig_mag =
 439                                 sband->channels[i].max_antenna_gain;
 440                         sband->channels[i].orig_mpwr =
 441                                 sband->channels[i].max_power;
 442                         sband->channels[i].band = band;
 443                 }
 444
 445                 have_band = true;
 446         }
 447
 448         if (!have_band) {
 449                 WARN_ON(1);
 450                 return -EINVAL;
 451         }
 452
 453         /* check and set up bitrates */
 454         ieee80211_set_bitrate_flags(wiphy);
 455
 456         res = device_add(&rdev->wiphy.dev);
 457         if (res)
 458                 return res;
 459
 460         res = rfkill_register(rdev->rfkill);
 461         if (res)
 462                 goto out_rm_dev;
 463
 464         mutex_lock(&cfg80211_mutex);
 465
 466         /* set up regulatory info */
 467         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
 468
 469         list_add(&rdev->list, &cfg80211_rdev_list);
 470         cfg80211_rdev_list_generation++;
 471
 472         mutex_unlock(&cfg80211_mutex);
 473
 474         /* add to debugfs */
 475         rdev->wiphy.debugfsdir =
 476                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 477                                    ieee80211_debugfs_dir);
 478         if (IS_ERR(rdev->wiphy.debugfsdir))
 479                 rdev->wiphy.debugfsdir = NULL;
 480
 481         if (wiphy->custom_regulatory) {
 482                 struct regulatory_request request;
 483
 484                 request.wiphy_idx = get_wiphy_idx(wiphy);
 485                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 486                 request.alpha2[0] = '9';
 487                 request.alpha2[1] = '9';
 488
 489                 nl80211_send_reg_change_event(&request);
 490         }
 491
 492         cfg80211_debugfs_rdev_add(rdev);
 493
 494         return 0;
 495
 496  out_rm_dev:
 497         device_del(&rdev->wiphy.dev);
 498         return res;
 499 }
 500 EXPORT_SYMBOL(wiphy_register);
 501
 502 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 503 {
 504         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 505
 506         if (!rdev->ops->rfkill_poll)
 507                 return;
 508         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 509         rfkill_resume_polling(rdev->rfkill);
 510 }
 511 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 512
 513 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 514 {
 515         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 516
 517         rfkill_pause_polling(rdev->rfkill);
 518 }
 519 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 520
 521 void wiphy_unregister(struct wiphy *wiphy)
 522 {
 523         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 524
 525         rfkill_unregister(rdev->rfkill);
 526
 527         /* protect the device list */
 528         mutex_lock(&cfg80211_mutex);
 529
 530         wait_event(rdev->dev_wait, ({
 531                 int __count;
 532                 mutex_lock(&rdev->devlist_mtx);
 533                 __count = rdev->opencount;
 534                 mutex_unlock(&rdev->devlist_mtx);
 535                 __count == 0;}));
 536
 537         mutex_lock(&rdev->devlist_mtx);
 538         BUG_ON(!list_empty(&rdev->netdev_list));
 539         mutex_unlock(&rdev->devlist_mtx);
 540
 541         /*
 542          * First remove the hardware from everywhere, this makes
 543          * it impossible to find from userspace.
 544          */
 545         cfg80211_debugfs_rdev_del(rdev);
 546         list_del(&rdev->list);
 547
 548         /*
 549          * Try to grab rdev->mtx. If a command is still in progress,
 550          * hopefully the driver will refuse it since it's tearing
 551          * down the device already. We wait for this command to complete
 552          * before unlinking the item from the list.
 553          * Note: as codified by the BUG_ON above we cannot get here if
 554          * a virtual interface is still present. Hence, we can only get
 555          * to lock contention here if userspace issues a command that
 556          * identified the hardware by wiphy index.
 557          */
 558         cfg80211_lock_rdev(rdev);
 559         /* nothing */
 560         cfg80211_unlock_rdev(rdev);
 561
 562         /* If this device got a regulatory hint tell core its
 563          * free to listen now to a new shiny device regulatory hint */
 564         reg_device_remove(wiphy);
 565
 566         cfg80211_rdev_list_generation++;
 567         device_del(&rdev->wiphy.dev);
 568         debugfs_remove(rdev->wiphy.debugfsdir);
 569
 570         mutex_unlock(&cfg80211_mutex);
 571
 572         flush_work(&rdev->scan_done_wk);
 573         cancel_work_sync(&rdev->conn_work);
 574         flush_work(&rdev->event_work);
 575 }
 576 EXPORT_SYMBOL(wiphy_unregister);
 577
 578 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 579 {
 580         struct cfg80211_internal_bss *scan, *tmp;
 581         rfkill_destroy(rdev->rfkill);
 582         mutex_destroy(&rdev->mtx);
 583         mutex_destroy(&rdev->devlist_mtx);
 584         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 585                 cfg80211_put_bss(&scan->pub);
 586         kfree(rdev);
 587 }
 588
 589 void wiphy_free(struct wiphy *wiphy)
 590 {
 591         put_device(&wiphy->dev);
 592 }
 593 EXPORT_SYMBOL(wiphy_free);
 594
 595 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 596 {
 597         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 598
 599         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 600                 schedule_work(&rdev->rfkill_sync);
 601 }
 602 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 603
 604 static void wdev_cleanup_work(struct work_struct *work)
 605 {
 606         struct wireless_dev *wdev;
 607         struct cfg80211_registered_device *rdev;
 608
 609         wdev = container_of(work, struct wireless_dev, cleanup_work);
 610         rdev = wiphy_to_dev(wdev->wiphy);
 611
 612         cfg80211_lock_rdev(rdev);
 613
 614         if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
 615                 rdev->scan_req->aborted = true;
 616                 ___cfg80211_scan_done(rdev, true);
 617         }
 618
 619         cfg80211_unlock_rdev(rdev);
 620
 621         mutex_lock(&rdev->devlist_mtx);
 622         rdev->opencount--;
 623         mutex_unlock(&rdev->devlist_mtx);
 624         wake_up(&rdev->dev_wait);
 625
 626         dev_put(wdev->netdev);
 627 }
 628
 629 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
 630                                          unsigned long state,
 631                                          void *ndev)
 632 {
 633         struct net_device *dev = ndev;
 634         struct wireless_dev *wdev = dev->ieee80211_ptr;
 635         struct cfg80211_registered_device *rdev;
 636
 637         if (!wdev)
 638                 return NOTIFY_DONE;
 639
 640         rdev = wiphy_to_dev(wdev->wiphy);
 641
 642         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 643
 644         switch (state) {
 645         case NETDEV_REGISTER:
 646                 /*
 647                  * NB: cannot take rdev->mtx here because this may be
 648                  * called within code protected by it when interfaces
 649                  * are added with nl80211.
 650                  */
 651                 mutex_init(&wdev->mtx);
 652                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
 653                 INIT_LIST_HEAD(&wdev->event_list);
 654                 spin_lock_init(&wdev->event_lock);
 655                 mutex_lock(&rdev->devlist_mtx);
 656                 list_add(&wdev->list, &rdev->netdev_list);
 657                 rdev->devlist_generation++;
 658                 /* can only change netns with wiphy */
 659                 dev->features |= NETIF_F_NETNS_LOCAL;
 660
 661                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 662                                       "phy80211")) {
 663                         printk(KERN_ERR "wireless: failed to add phy80211 "
 664                                 "symlink to netdev!\n");
 665                 }
 666                 wdev->netdev = dev;
 667                 wdev->sme_state = CFG80211_SME_IDLE;
 668                 mutex_unlock(&rdev->devlist_mtx);
 669 #ifdef CONFIG_WIRELESS_EXT
 670                 if (!dev->wireless_handlers)
 671                         dev->wireless_handlers = &cfg80211_wext_handler;
 672                 wdev->wext.default_key = -1;
 673                 wdev->wext.default_mgmt_key = -1;
 674                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 675                 wdev->wext.ps = wdev->wiphy->ps_default;
 676                 wdev->wext.ps_timeout = 100;
 677                 if (rdev->ops->set_power_mgmt)
 678                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
 679                                                       wdev->wext.ps,
 680                                                       wdev->wext.ps_timeout)) {
 681                                 /* assume this means it's off */
 682                                 wdev->wext.ps = false;
 683                         }
 684 #endif
 685                 break;
 686         case NETDEV_GOING_DOWN:
 687                 switch (wdev->iftype) {
 688                 case NL80211_IFTYPE_ADHOC:
 689                         cfg80211_leave_ibss(rdev, dev, true);
 690                         break;
 691                 case NL80211_IFTYPE_STATION:
 692                         wdev_lock(wdev);
 693 #ifdef CONFIG_WIRELESS_EXT
 694                         kfree(wdev->wext.ie);
 695                         wdev->wext.ie = NULL;
 696                         wdev->wext.ie_len = 0;
 697                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 698 #endif
 699                         __cfg80211_disconnect(rdev, dev,
 700                                               WLAN_REASON_DEAUTH_LEAVING, true);
 701                         cfg80211_mlme_down(rdev, dev);
 702                         wdev_unlock(wdev);
 703                         break;
 704                 default:
 705                         break;
 706                 }
 707                 break;
 708         case NETDEV_DOWN:
 709                 dev_hold(dev);
 710                 schedule_work(&wdev->cleanup_work);
 711                 break;
 712         case NETDEV_UP:
 713                 /*
 714                  * If we have a really quick DOWN/UP succession we may
 715                  * have this work still pending ... cancel it and see
 716                  * if it was pending, in which case we need to account
 717                  * for some of the work it would have done.
 718                  */
 719                 if (cancel_work_sync(&wdev->cleanup_work)) {
 720                         mutex_lock(&rdev->devlist_mtx);
 721                         rdev->opencount--;
 722                         mutex_unlock(&rdev->devlist_mtx);
 723                         dev_put(dev);
 724                 }
 725 #ifdef CONFIG_WIRELESS_EXT
 726                 cfg80211_lock_rdev(rdev);
 727                 mutex_lock(&rdev->devlist_mtx);
 728                 wdev_lock(wdev);
 729                 switch (wdev->iftype) {
 730                 case NL80211_IFTYPE_ADHOC:
 731                         cfg80211_ibss_wext_join(rdev, wdev);
 732                         break;
 733                 case NL80211_IFTYPE_STATION:
 734                         cfg80211_mgd_wext_connect(rdev, wdev);
 735                         break;
 736                 default:
 737                         break;
 738                 }
 739                 wdev_unlock(wdev);
 740                 rdev->opencount++;
 741                 mutex_unlock(&rdev->devlist_mtx);
 742                 cfg80211_unlock_rdev(rdev);
 743 #endif
 744                 break;
 745         case NETDEV_UNREGISTER:
 746                 /*
 747                  * NB: cannot take rdev->mtx here because this may be
 748                  * called within code protected by it when interfaces
 749                  * are removed with nl80211.
 750                  */
 751                 mutex_lock(&rdev->devlist_mtx);
 752                 /*
 753                  * It is possible to get NETDEV_UNREGISTER
 754                  * multiple times. To detect that, check
 755                  * that the interface is still on the list
 756                  * of registered interfaces, and only then
 757                  * remove and clean it up.
 758                  */
 759                 if (!list_empty(&wdev->list)) {
 760                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 761                         list_del_init(&wdev->list);
 762                         rdev->devlist_generation++;
 763 #ifdef CONFIG_WIRELESS_EXT
 764                         kfree(wdev->wext.keys);
 765 #endif
 766                 }
 767                 mutex_unlock(&rdev->devlist_mtx);
 768                 break;
 769         case NETDEV_PRE_UP:
 770                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 771                         return notifier_from_errno(-EOPNOTSUPP);
 772                 if (rfkill_blocked(rdev->rfkill))
 773                         return notifier_from_errno(-ERFKILL);
 774                 break;
 775         }
 776
 777         return NOTIFY_DONE;
 778 }
 779
 780 static struct notifier_block cfg80211_netdev_notifier = {
 781         .notifier_call = cfg80211_netdev_notifier_call,
 782 };
 783
 784 static void __net_exit cfg80211_pernet_exit(struct net *net)
 785 {
 786         struct cfg80211_registered_device *rdev;
 787
 788         rtnl_lock();
 789         mutex_lock(&cfg80211_mutex);
 790         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 791                 if (net_eq(wiphy_net(&rdev->wiphy), net))
 792                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
 793         }
 794         mutex_unlock(&cfg80211_mutex);
 795         rtnl_unlock();
 796 }
 797
 798 static struct pernet_operations cfg80211_pernet_ops = {
 799         .exit = cfg80211_pernet_exit,
 800 };
 801
 802 static int __init cfg80211_init(void)
 803 {
 804         int err;
 805
 806         err = register_pernet_device(&cfg80211_pernet_ops);
 807         if (err)
 808                 goto out_fail_pernet;
 809
 810         err = wiphy_sysfs_init();
 811         if (err)
 812                 goto out_fail_sysfs;
 813
 814         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
 815         if (err)
 816                 goto out_fail_notifier;
 817
 818         err = nl80211_init();
 819         if (err)
 820                 goto out_fail_nl80211;
 821
 822         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
 823
 824         err = regulatory_init();
 825         if (err)
 826                 goto out_fail_reg;
 827
 828         return 0;
 829
 830 out_fail_reg:
 831         debugfs_remove(ieee80211_debugfs_dir);
 832 out_fail_nl80211:
 833         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 834 out_fail_notifier:
 835         wiphy_sysfs_exit();
 836 out_fail_sysfs:
 837         unregister_pernet_device(&cfg80211_pernet_ops);
 838 out_fail_pernet:
 839         return err;
 840 }
 841 subsys_initcall(cfg80211_init);
 842
 843 static void cfg80211_exit(void)
 844 {
 845         debugfs_remove(ieee80211_debugfs_dir);
 846         nl80211_exit();
 847         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 848         wiphy_sysfs_exit();
 849         regulatory_exit();
 850         unregister_pernet_device(&cfg80211_pernet_ops);
 851 }
 852 module_exit(cfg80211_exit);