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 #include "ethtool.h"
  26
  27 /* name for sysfs, %d is appended */
  28 #define PHY_NAME "phy"
  29
  30 MODULE_AUTHOR("Johannes Berg");
  31 MODULE_LICENSE("GPL");
  32 MODULE_DESCRIPTION("wireless configuration support");
  33
  34 /* RCU might be appropriate here since we usually
  35  * only read the list, and that can happen quite
  36  * often because we need to do it for each command */
  37 LIST_HEAD(cfg80211_rdev_list);
  38 int cfg80211_rdev_list_generation;
  39
  40 /*
  41  * This is used to protect the cfg80211_rdev_list
  42  */
  43 DEFINE_MUTEX(cfg80211_mutex);
  44
  45 /* for debugfs */
  46 static struct dentry *ieee80211_debugfs_dir;
  47
  48 /* requires cfg80211_mutex to be held! */
  49 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  50 {
  51         struct cfg80211_registered_device *result = NULL, *rdev;
  52
  53         if (!wiphy_idx_valid(wiphy_idx))
  54                 return NULL;
  55
  56         assert_cfg80211_lock();
  57
  58         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  59                 if (rdev->wiphy_idx == wiphy_idx) {
  60                         result = rdev;
  61                         break;
  62                 }
  63         }
  64
  65         return result;
  66 }
  67
  68 int get_wiphy_idx(struct wiphy *wiphy)
  69 {
  70         struct cfg80211_registered_device *rdev;
  71         if (!wiphy)
  72                 return WIPHY_IDX_STALE;
  73         rdev = wiphy_to_dev(wiphy);
  74         return rdev->wiphy_idx;
  75 }
  76
  77 /* requires cfg80211_rdev_mutex to be held! */
  78 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  79 {
  80         struct cfg80211_registered_device *rdev;
  81
  82         if (!wiphy_idx_valid(wiphy_idx))
  83                 return NULL;
  84
  85         assert_cfg80211_lock();
  86
  87         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  88         if (!rdev)
  89                 return NULL;
  90         return &rdev->wiphy;
  91 }
  92
  93 /* requires cfg80211_mutex to be held! */
  94 struct cfg80211_registered_device *
  95 __cfg80211_rdev_from_info(struct genl_info *info)
  96 {
  97         int ifindex;
  98         struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
  99         struct net_device *dev;
 100         int err = -EINVAL;
 101
 102         assert_cfg80211_lock();
 103
 104         if (info->attrs[NL80211_ATTR_WIPHY]) {
 105                 bywiphyidx = cfg80211_rdev_by_wiphy_idx(
 106                                 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
 107                 err = -ENODEV;
 108         }
 109
 110         if (info->attrs[NL80211_ATTR_IFINDEX]) {
 111                 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
 112                 dev = dev_get_by_index(genl_info_net(info), ifindex);
 113                 if (dev) {
 114                         if (dev->ieee80211_ptr)
 115                                 byifidx =
 116                                         wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 117                         dev_put(dev);
 118                 }
 119                 err = -ENODEV;
 120         }
 121
 122         if (bywiphyidx && byifidx) {
 123                 if (bywiphyidx != byifidx)
 124                         return ERR_PTR(-EINVAL);
 125                 else
 126                         return bywiphyidx; /* == byifidx */
 127         }
 128         if (bywiphyidx)
 129                 return bywiphyidx;
 130
 131         if (byifidx)
 132                 return byifidx;
 133
 134         return ERR_PTR(err);
 135 }
 136
 137 struct cfg80211_registered_device *
 138 cfg80211_get_dev_from_info(struct genl_info *info)
 139 {
 140         struct cfg80211_registered_device *rdev;
 141
 142         mutex_lock(&cfg80211_mutex);
 143         rdev = __cfg80211_rdev_from_info(info);
 144
 145         /* if it is not an error we grab the lock on
 146          * it to assure it won't be going away while
 147          * we operate on it */
 148         if (!IS_ERR(rdev))
 149                 mutex_lock(&rdev->mtx);
 150
 151         mutex_unlock(&cfg80211_mutex);
 152
 153         return rdev;
 154 }
 155
 156 struct cfg80211_registered_device *
 157 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
 158 {
 159         struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
 160         struct net_device *dev;
 161
 162         mutex_lock(&cfg80211_mutex);
 163         dev = dev_get_by_index(net, ifindex);
 164         if (!dev)
 165                 goto out;
 166         if (dev->ieee80211_ptr) {
 167                 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 168                 mutex_lock(&rdev->mtx);
 169         } else
 170                 rdev = ERR_PTR(-ENODEV);
 171         dev_put(dev);
 172  out:
 173         mutex_unlock(&cfg80211_mutex);
 174         return rdev;
 175 }
 176
 177 /* requires cfg80211_mutex to be held */
 178 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 179                         char *newname)
 180 {
 181         struct cfg80211_registered_device *rdev2;
 182         int wiphy_idx, taken = -1, result, digits;
 183
 184         assert_cfg80211_lock();
 185
 186         /* prohibit calling the thing phy%d when %d is not its number */
 187         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 188         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 189                 /* count number of places needed to print wiphy_idx */
 190                 digits = 1;
 191                 while (wiphy_idx /= 10)
 192                         digits++;
 193                 /*
 194                  * deny the name if it is phy<idx> where <idx> is printed
 195                  * without leading zeroes. taken == strlen(newname) here
 196                  */
 197                 if (taken == strlen(PHY_NAME) + digits)
 198                         return -EINVAL;
 199         }
 200
 201
 202         /* Ignore nop renames */
 203         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
 204                 return 0;
 205
 206         /* Ensure another device does not already have this name. */
 207         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 208                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
 209                         return -EINVAL;
 210
 211         result = device_rename(&rdev->wiphy.dev, newname);
 212         if (result)
 213                 return result;
 214
 215         if (rdev->wiphy.debugfsdir &&
 216             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 217                             rdev->wiphy.debugfsdir,
 218                             rdev->wiphy.debugfsdir->d_parent,
 219                             newname))
 220                 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
 221                        newname);
 222
 223         nl80211_notify_dev_rename(rdev);
 224
 225         return 0;
 226 }
 227
 228 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 229                           struct net *net)
 230 {
 231         struct wireless_dev *wdev;
 232         int err = 0;
 233
 234         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 235                 return -EOPNOTSUPP;
 236
 237         list_for_each_entry(wdev, &rdev->netdev_list, list) {
 238                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 239                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 240                 if (err)
 241                         break;
 242                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 243         }
 244
 245         if (err) {
 246                 /* failed -- clean up to old netns */
 247                 net = wiphy_net(&rdev->wiphy);
 248
 249                 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
 250                                                      list) {
 251                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 252                         err = dev_change_net_namespace(wdev->netdev, net,
 253                                                         "wlan%d");
 254                         WARN_ON(err);
 255                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 256                 }
 257         }
 258
 259         wiphy_net_set(&rdev->wiphy, net);
 260
 261         return err;
 262 }
 263
 264 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 265 {
 266         struct cfg80211_registered_device *rdev = data;
 267
 268         rdev->ops->rfkill_poll(&rdev->wiphy);
 269 }
 270
 271 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 272 {
 273         struct cfg80211_registered_device *rdev = data;
 274         struct wireless_dev *wdev;
 275
 276         if (!blocked)
 277                 return 0;
 278
 279         rtnl_lock();
 280         mutex_lock(&rdev->devlist_mtx);
 281
 282         list_for_each_entry(wdev, &rdev->netdev_list, list)
 283                 dev_close(wdev->netdev);
 284
 285         mutex_unlock(&rdev->devlist_mtx);
 286         rtnl_unlock();
 287
 288         return 0;
 289 }
 290
 291 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 292 {
 293         struct cfg80211_registered_device *rdev;
 294
 295         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 296         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 297 }
 298
 299 static void cfg80211_event_work(struct work_struct *work)
 300 {
 301         struct cfg80211_registered_device *rdev;
 302
 303         rdev = container_of(work, struct cfg80211_registered_device,
 304                             event_work);
 305
 306         rtnl_lock();
 307         cfg80211_lock_rdev(rdev);
 308
 309         cfg80211_process_rdev_events(rdev);
 310         cfg80211_unlock_rdev(rdev);
 311         rtnl_unlock();
 312 }
 313
 314 /* exported functions */
 315
 316 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 317 {
 318         static int wiphy_counter;
 319
 320         struct cfg80211_registered_device *rdev;
 321         int alloc_size;
 322
 323         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 324         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 325         WARN_ON(ops->connect && !ops->disconnect);
 326         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 327         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 328         WARN_ON(ops->add_station && !ops->del_station);
 329         WARN_ON(ops->add_mpath && !ops->del_mpath);
 330
 331         alloc_size = sizeof(*rdev) + sizeof_priv;
 332
 333         rdev = kzalloc(alloc_size, GFP_KERNEL);
 334         if (!rdev)
 335                 return NULL;
 336
 337         rdev->ops = ops;
 338
 339         mutex_lock(&cfg80211_mutex);
 340
 341         rdev->wiphy_idx = wiphy_counter++;
 342
 343         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
 344                 wiphy_counter--;
 345                 mutex_unlock(&cfg80211_mutex);
 346                 /* ugh, wrapped! */
 347                 kfree(rdev);
 348                 return NULL;
 349         }
 350
 351         mutex_unlock(&cfg80211_mutex);
 352
 353         /* give it a proper name */
 354         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 355
 356         mutex_init(&rdev->mtx);
 357         mutex_init(&rdev->devlist_mtx);
 358         INIT_LIST_HEAD(&rdev->netdev_list);
 359         spin_lock_init(&rdev->bss_lock);
 360         INIT_LIST_HEAD(&rdev->bss_list);
 361         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 362
 363 #ifdef CONFIG_CFG80211_WEXT
 364         rdev->wiphy.wext = &cfg80211_wext_handler;
 365 #endif
 366
 367         device_initialize(&rdev->wiphy.dev);
 368         rdev->wiphy.dev.class = &ieee80211_class;
 369         rdev->wiphy.dev.platform_data = rdev;
 370
 371 #ifdef CONFIG_CFG80211_DEFAULT_PS
 372         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 373 #endif
 374
 375         wiphy_net_set(&rdev->wiphy, &init_net);
 376
 377         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 378         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 379                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 380                                    &rdev->rfkill_ops, rdev);
 381
 382         if (!rdev->rfkill) {
 383                 kfree(rdev);
 384                 return NULL;
 385         }
 386
 387         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 388         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 389         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 390
 391         init_waitqueue_head(&rdev->dev_wait);
 392
 393         /*
 394          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 395          * Fragmentation and RTS threshold are disabled by default with the
 396          * special -1 value.
 397          */
 398         rdev->wiphy.retry_short = 7;
 399         rdev->wiphy.retry_long = 4;
 400         rdev->wiphy.frag_threshold = (u32) -1;
 401         rdev->wiphy.rts_threshold = (u32) -1;
 402
 403         return &rdev->wiphy;
 404 }
 405 EXPORT_SYMBOL(wiphy_new);
 406
 407 int wiphy_register(struct wiphy *wiphy)
 408 {
 409         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 410         int res;
 411         enum ieee80211_band band;
 412         struct ieee80211_supported_band *sband;
 413         bool have_band = false;
 414         int i;
 415         u16 ifmodes = wiphy->interface_modes;
 416
 417         /* sanity check ifmodes */
 418         WARN_ON(!ifmodes);
 419         ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
 420         if (WARN_ON(ifmodes != wiphy->interface_modes))
 421                 wiphy->interface_modes = ifmodes;
 422
 423         /* sanity check supported bands/channels */
 424         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 425                 sband = wiphy->bands[band];
 426                 if (!sband)
 427                         continue;
 428
 429                 sband->band = band;
 430
 431                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
 432                         return -EINVAL;
 433
 434                 /*
 435                  * Since we use a u32 for rate bitmaps in
 436                  * ieee80211_get_response_rate, we cannot
 437                  * have more than 32 legacy rates.
 438                  */
 439                 if (WARN_ON(sband->n_bitrates > 32))
 440                         return -EINVAL;
 441
 442                 for (i = 0; i < sband->n_channels; i++) {
 443                         sband->channels[i].orig_flags =
 444                                 sband->channels[i].flags;
 445                         sband->channels[i].orig_mag =
 446                                 sband->channels[i].max_antenna_gain;
 447                         sband->channels[i].orig_mpwr =
 448                                 sband->channels[i].max_power;
 449                         sband->channels[i].band = band;
 450                 }
 451
 452                 have_band = true;
 453         }
 454
 455         if (!have_band) {
 456                 WARN_ON(1);
 457                 return -EINVAL;
 458         }
 459
 460         /* check and set up bitrates */
 461         ieee80211_set_bitrate_flags(wiphy);
 462
 463         res = device_add(&rdev->wiphy.dev);
 464         if (res)
 465                 return res;
 466
 467         res = rfkill_register(rdev->rfkill);
 468         if (res)
 469                 goto out_rm_dev;
 470
 471         mutex_lock(&cfg80211_mutex);
 472
 473         /* set up regulatory info */
 474         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
 475
 476         list_add(&rdev->list, &cfg80211_rdev_list);
 477         cfg80211_rdev_list_generation++;
 478
 479         mutex_unlock(&cfg80211_mutex);
 480
 481         /* add to debugfs */
 482         rdev->wiphy.debugfsdir =
 483                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 484                                    ieee80211_debugfs_dir);
 485         if (IS_ERR(rdev->wiphy.debugfsdir))
 486                 rdev->wiphy.debugfsdir = NULL;
 487
 488         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
 489                 struct regulatory_request request;
 490
 491                 request.wiphy_idx = get_wiphy_idx(wiphy);
 492                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 493                 request.alpha2[0] = '9';
 494                 request.alpha2[1] = '9';
 495
 496                 nl80211_send_reg_change_event(&request);
 497         }
 498
 499         cfg80211_debugfs_rdev_add(rdev);
 500
 501         return 0;
 502
 503  out_rm_dev:
 504         device_del(&rdev->wiphy.dev);
 505         return res;
 506 }
 507 EXPORT_SYMBOL(wiphy_register);
 508
 509 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 510 {
 511         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 512
 513         if (!rdev->ops->rfkill_poll)
 514                 return;
 515         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 516         rfkill_resume_polling(rdev->rfkill);
 517 }
 518 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 519
 520 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 521 {
 522         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 523
 524         rfkill_pause_polling(rdev->rfkill);
 525 }
 526 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 527
 528 void wiphy_unregister(struct wiphy *wiphy)
 529 {
 530         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 531
 532         rfkill_unregister(rdev->rfkill);
 533
 534         /* protect the device list */
 535         mutex_lock(&cfg80211_mutex);
 536
 537         wait_event(rdev->dev_wait, ({
 538                 int __count;
 539                 mutex_lock(&rdev->devlist_mtx);
 540                 __count = rdev->opencount;
 541                 mutex_unlock(&rdev->devlist_mtx);
 542                 __count == 0;}));
 543
 544         mutex_lock(&rdev->devlist_mtx);
 545         BUG_ON(!list_empty(&rdev->netdev_list));
 546         mutex_unlock(&rdev->devlist_mtx);
 547
 548         /*
 549          * First remove the hardware from everywhere, this makes
 550          * it impossible to find from userspace.
 551          */
 552         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 553         list_del(&rdev->list);
 554
 555         /*
 556          * Try to grab rdev->mtx. If a command is still in progress,
 557          * hopefully the driver will refuse it since it's tearing
 558          * down the device already. We wait for this command to complete
 559          * before unlinking the item from the list.
 560          * Note: as codified by the BUG_ON above we cannot get here if
 561          * a virtual interface is still present. Hence, we can only get
 562          * to lock contention here if userspace issues a command that
 563          * identified the hardware by wiphy index.
 564          */
 565         cfg80211_lock_rdev(rdev);
 566         /* nothing */
 567         cfg80211_unlock_rdev(rdev);
 568
 569         /* If this device got a regulatory hint tell core its
 570          * free to listen now to a new shiny device regulatory hint */
 571         reg_device_remove(wiphy);
 572
 573         cfg80211_rdev_list_generation++;
 574         device_del(&rdev->wiphy.dev);
 575
 576         mutex_unlock(&cfg80211_mutex);
 577
 578         flush_work(&rdev->scan_done_wk);
 579         cancel_work_sync(&rdev->conn_work);
 580         flush_work(&rdev->event_work);
 581 }
 582 EXPORT_SYMBOL(wiphy_unregister);
 583
 584 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 585 {
 586         struct cfg80211_internal_bss *scan, *tmp;
 587         rfkill_destroy(rdev->rfkill);
 588         mutex_destroy(&rdev->mtx);
 589         mutex_destroy(&rdev->devlist_mtx);
 590         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 591                 cfg80211_put_bss(&scan->pub);
 592         kfree(rdev);
 593 }
 594
 595 void wiphy_free(struct wiphy *wiphy)
 596 {
 597         put_device(&wiphy->dev);
 598 }
 599 EXPORT_SYMBOL(wiphy_free);
 600
 601 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 602 {
 603         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 604
 605         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 606                 schedule_work(&rdev->rfkill_sync);
 607 }
 608 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 609
 610 static void wdev_cleanup_work(struct work_struct *work)
 611 {
 612         struct wireless_dev *wdev;
 613         struct cfg80211_registered_device *rdev;
 614
 615         wdev = container_of(work, struct wireless_dev, cleanup_work);
 616         rdev = wiphy_to_dev(wdev->wiphy);
 617
 618         cfg80211_lock_rdev(rdev);
 619
 620         if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
 621                 rdev->scan_req->aborted = true;
 622                 ___cfg80211_scan_done(rdev, true);
 623         }
 624
 625         cfg80211_unlock_rdev(rdev);
 626
 627         mutex_lock(&rdev->devlist_mtx);
 628         rdev->opencount--;
 629         mutex_unlock(&rdev->devlist_mtx);
 630         wake_up(&rdev->dev_wait);
 631
 632         dev_put(wdev->netdev);
 633 }
 634
 635 static struct device_type wiphy_type = {
 636         .name   = "wlan",
 637 };
 638
 639 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
 640                                          unsigned long state,
 641                                          void *ndev)
 642 {
 643         struct net_device *dev = ndev;
 644         struct wireless_dev *wdev = dev->ieee80211_ptr;
 645         struct cfg80211_registered_device *rdev;
 646
 647         if (!wdev)
 648                 return NOTIFY_DONE;
 649
 650         rdev = wiphy_to_dev(wdev->wiphy);
 651
 652         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 653
 654         switch (state) {
 655         case NETDEV_POST_INIT:
 656                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 657                 break;
 658         case NETDEV_REGISTER:
 659                 /*
 660                  * NB: cannot take rdev->mtx here because this may be
 661                  * called within code protected by it when interfaces
 662                  * are added with nl80211.
 663                  */
 664                 mutex_init(&wdev->mtx);
 665                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
 666                 INIT_LIST_HEAD(&wdev->event_list);
 667                 spin_lock_init(&wdev->event_lock);
 668                 mutex_lock(&rdev->devlist_mtx);
 669                 list_add(&wdev->list, &rdev->netdev_list);
 670                 rdev->devlist_generation++;
 671                 /* can only change netns with wiphy */
 672                 dev->features |= NETIF_F_NETNS_LOCAL;
 673
 674                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 675                                       "phy80211")) {
 676                         printk(KERN_ERR "wireless: failed to add phy80211 "
 677                                 "symlink to netdev!\n");
 678                 }
 679                 wdev->netdev = dev;
 680                 wdev->sme_state = CFG80211_SME_IDLE;
 681                 mutex_unlock(&rdev->devlist_mtx);
 682 #ifdef CONFIG_CFG80211_WEXT
 683                 wdev->wext.default_key = -1;
 684                 wdev->wext.default_mgmt_key = -1;
 685                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 686                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
 687                         wdev->wext.ps = true;
 688                 else
 689                         wdev->wext.ps = false;
 690                 wdev->wext.ps_timeout = 100;
 691                 if (rdev->ops->set_power_mgmt)
 692                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
 693                                                       wdev->wext.ps,
 694                                                       wdev->wext.ps_timeout)) {
 695                                 /* assume this means it's off */
 696                                 wdev->wext.ps = false;
 697                         }
 698 #endif
 699                 if (!dev->ethtool_ops)
 700                         dev->ethtool_ops = &cfg80211_ethtool_ops;
 701
 702                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 703                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
 704                         dev->priv_flags |= IFF_DONT_BRIDGE;
 705                 break;
 706         case NETDEV_GOING_DOWN:
 707                 switch (wdev->iftype) {
 708                 case NL80211_IFTYPE_ADHOC:
 709                         cfg80211_leave_ibss(rdev, dev, true);
 710                         break;
 711                 case NL80211_IFTYPE_STATION:
 712                         wdev_lock(wdev);
 713 #ifdef CONFIG_CFG80211_WEXT
 714                         kfree(wdev->wext.ie);
 715                         wdev->wext.ie = NULL;
 716                         wdev->wext.ie_len = 0;
 717                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 718 #endif
 719                         __cfg80211_disconnect(rdev, dev,
 720                                               WLAN_REASON_DEAUTH_LEAVING, true);
 721                         cfg80211_mlme_down(rdev, dev);
 722                         wdev_unlock(wdev);
 723                         break;
 724                 default:
 725                         break;
 726                 }
 727                 break;
 728         case NETDEV_DOWN:
 729                 dev_hold(dev);
 730                 schedule_work(&wdev->cleanup_work);
 731                 break;
 732         case NETDEV_UP:
 733                 /*
 734                  * If we have a really quick DOWN/UP succession we may
 735                  * have this work still pending ... cancel it and see
 736                  * if it was pending, in which case we need to account
 737                  * for some of the work it would have done.
 738                  */
 739                 if (cancel_work_sync(&wdev->cleanup_work)) {
 740                         mutex_lock(&rdev->devlist_mtx);
 741                         rdev->opencount--;
 742                         mutex_unlock(&rdev->devlist_mtx);
 743                         dev_put(dev);
 744                 }
 745 #ifdef CONFIG_CFG80211_WEXT
 746                 cfg80211_lock_rdev(rdev);
 747                 mutex_lock(&rdev->devlist_mtx);
 748                 wdev_lock(wdev);
 749                 switch (wdev->iftype) {
 750                 case NL80211_IFTYPE_ADHOC:
 751                         cfg80211_ibss_wext_join(rdev, wdev);
 752                         break;
 753                 case NL80211_IFTYPE_STATION:
 754                         cfg80211_mgd_wext_connect(rdev, wdev);
 755                         break;
 756                 default:
 757                         break;
 758                 }
 759                 wdev_unlock(wdev);
 760                 rdev->opencount++;
 761                 mutex_unlock(&rdev->devlist_mtx);
 762                 cfg80211_unlock_rdev(rdev);
 763 #endif
 764                 break;
 765         case NETDEV_UNREGISTER:
 766                 /*
 767                  * NB: cannot take rdev->mtx here because this may be
 768                  * called within code protected by it when interfaces
 769                  * are removed with nl80211.
 770                  */
 771                 mutex_lock(&rdev->devlist_mtx);
 772                 /*
 773                  * It is possible to get NETDEV_UNREGISTER
 774                  * multiple times. To detect that, check
 775                  * that the interface is still on the list
 776                  * of registered interfaces, and only then
 777                  * remove and clean it up.
 778                  */
 779                 if (!list_empty(&wdev->list)) {
 780                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 781                         list_del_init(&wdev->list);
 782                         rdev->devlist_generation++;
 783 #ifdef CONFIG_CFG80211_WEXT
 784                         kfree(wdev->wext.keys);
 785 #endif
 786                 }
 787                 mutex_unlock(&rdev->devlist_mtx);
 788                 break;
 789         case NETDEV_PRE_UP:
 790                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 791                         return notifier_from_errno(-EOPNOTSUPP);
 792                 if (rfkill_blocked(rdev->rfkill))
 793                         return notifier_from_errno(-ERFKILL);
 794                 break;
 795         }
 796
 797         return NOTIFY_DONE;
 798 }
 799
 800 static struct notifier_block cfg80211_netdev_notifier = {
 801         .notifier_call = cfg80211_netdev_notifier_call,
 802 };
 803
 804 static void __net_exit cfg80211_pernet_exit(struct net *net)
 805 {
 806         struct cfg80211_registered_device *rdev;
 807
 808         rtnl_lock();
 809         mutex_lock(&cfg80211_mutex);
 810         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 811                 if (net_eq(wiphy_net(&rdev->wiphy), net))
 812                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
 813         }
 814         mutex_unlock(&cfg80211_mutex);
 815         rtnl_unlock();
 816 }
 817
 818 static struct pernet_operations cfg80211_pernet_ops = {
 819         .exit = cfg80211_pernet_exit,
 820 };
 821
 822 static int __init cfg80211_init(void)
 823 {
 824         int err;
 825
 826         err = register_pernet_device(&cfg80211_pernet_ops);
 827         if (err)
 828                 goto out_fail_pernet;
 829
 830         err = wiphy_sysfs_init();
 831         if (err)
 832                 goto out_fail_sysfs;
 833
 834         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
 835         if (err)
 836                 goto out_fail_notifier;
 837
 838         err = nl80211_init();
 839         if (err)
 840                 goto out_fail_nl80211;
 841
 842         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
 843
 844         err = regulatory_init();
 845         if (err)
 846                 goto out_fail_reg;
 847
 848         return 0;
 849
 850 out_fail_reg:
 851         debugfs_remove(ieee80211_debugfs_dir);
 852 out_fail_nl80211:
 853         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 854 out_fail_notifier:
 855         wiphy_sysfs_exit();
 856 out_fail_sysfs:
 857         unregister_pernet_device(&cfg80211_pernet_ops);
 858 out_fail_pernet:
 859         return err;
 860 }
 861 subsys_initcall(cfg80211_init);
 862
 863 static void cfg80211_exit(void)
 864 {
 865         debugfs_remove(ieee80211_debugfs_dir);
 866         nl80211_exit();
 867         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 868         wiphy_sysfs_exit();
 869         regulatory_exit();
 870         unregister_pernet_device(&cfg80211_pernet_ops);
 871 }
 872 module_exit(cfg80211_exit);