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 int cfg80211_rdev_list_generation;
  36
  37 /*
  38  * This is used to protect the cfg80211_rdev_list
  39  */
  40 DEFINE_MUTEX(cfg80211_mutex);
  41
  42 /* for debugfs */
  43 static struct dentry *ieee80211_debugfs_dir;
  44
  45 /* requires cfg80211_mutex to be held! */
  46 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  47 {
  48         struct cfg80211_registered_device *result = NULL, *rdev;
  49
  50         if (!wiphy_idx_valid(wiphy_idx))
  51                 return NULL;
  52
  53         assert_cfg80211_lock();
  54
  55         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  56                 if (rdev->wiphy_idx == wiphy_idx) {
  57                         result = rdev;
  58                         break;
  59                 }
  60         }
  61
  62         return result;
  63 }
  64
  65 int get_wiphy_idx(struct wiphy *wiphy)
  66 {
  67         struct cfg80211_registered_device *rdev;
  68         if (!wiphy)
  69                 return WIPHY_IDX_STALE;
  70         rdev = wiphy_to_dev(wiphy);
  71         return rdev->wiphy_idx;
  72 }
  73
  74 /* requires cfg80211_rdev_mutex to be held! */
  75 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  76 {
  77         struct cfg80211_registered_device *rdev;
  78
  79         if (!wiphy_idx_valid(wiphy_idx))
  80                 return NULL;
  81
  82         assert_cfg80211_lock();
  83
  84         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  85         if (!rdev)
  86                 return NULL;
  87         return &rdev->wiphy;
  88 }
  89
  90 /* requires cfg80211_mutex to be held! */
  91 struct cfg80211_registered_device *
  92 __cfg80211_rdev_from_info(struct genl_info *info)
  93 {
  94         int ifindex;
  95         struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
  96         struct net_device *dev;
  97         int err = -EINVAL;
  98
  99         assert_cfg80211_lock();
 100
 101         if (info->attrs[NL80211_ATTR_WIPHY]) {
 102                 bywiphyidx = cfg80211_rdev_by_wiphy_idx(
 103                                 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
 104                 err = -ENODEV;
 105         }
 106
 107         if (info->attrs[NL80211_ATTR_IFINDEX]) {
 108                 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
 109                 dev = dev_get_by_index(genl_info_net(info), ifindex);
 110                 if (dev) {
 111                         if (dev->ieee80211_ptr)
 112                                 byifidx =
 113                                         wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 114                         dev_put(dev);
 115                 }
 116                 err = -ENODEV;
 117         }
 118
 119         if (bywiphyidx && byifidx) {
 120                 if (bywiphyidx != byifidx)
 121                         return ERR_PTR(-EINVAL);
 122                 else
 123                         return bywiphyidx; /* == byifidx */
 124         }
 125         if (bywiphyidx)
 126                 return bywiphyidx;
 127
 128         if (byifidx)
 129                 return byifidx;
 130
 131         return ERR_PTR(err);
 132 }
 133
 134 struct cfg80211_registered_device *
 135 cfg80211_get_dev_from_info(struct genl_info *info)
 136 {
 137         struct cfg80211_registered_device *rdev;
 138
 139         mutex_lock(&cfg80211_mutex);
 140         rdev = __cfg80211_rdev_from_info(info);
 141
 142         /* if it is not an error we grab the lock on
 143          * it to assure it won't be going away while
 144          * we operate on it */
 145         if (!IS_ERR(rdev))
 146                 mutex_lock(&rdev->mtx);
 147
 148         mutex_unlock(&cfg80211_mutex);
 149
 150         return rdev;
 151 }
 152
 153 struct cfg80211_registered_device *
 154 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
 155 {
 156         struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
 157         struct net_device *dev;
 158
 159         mutex_lock(&cfg80211_mutex);
 160         dev = dev_get_by_index(net, ifindex);
 161         if (!dev)
 162                 goto out;
 163         if (dev->ieee80211_ptr) {
 164                 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 165                 mutex_lock(&rdev->mtx);
 166         } else
 167                 rdev = ERR_PTR(-ENODEV);
 168         dev_put(dev);
 169  out:
 170         mutex_unlock(&cfg80211_mutex);
 171         return rdev;
 172 }
 173
 174 /* requires cfg80211_mutex to be held */
 175 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 176                         char *newname)
 177 {
 178         struct cfg80211_registered_device *rdev2;
 179         int wiphy_idx, taken = -1, result, digits;
 180
 181         assert_cfg80211_lock();
 182
 183         /* prohibit calling the thing phy%d when %d is not its number */
 184         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 185         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 186                 /* count number of places needed to print wiphy_idx */
 187                 digits = 1;
 188                 while (wiphy_idx /= 10)
 189                         digits++;
 190                 /*
 191                  * deny the name if it is phy<idx> where <idx> is printed
 192                  * without leading zeroes. taken == strlen(newname) here
 193                  */
 194                 if (taken == strlen(PHY_NAME) + digits)
 195                         return -EINVAL;
 196         }
 197
 198
 199         /* Ignore nop renames */
 200         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
 201                 return 0;
 202
 203         /* Ensure another device does not already have this name. */
 204         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 205                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
 206                         return -EINVAL;
 207
 208         result = device_rename(&rdev->wiphy.dev, newname);
 209         if (result)
 210                 return result;
 211
 212         if (rdev->wiphy.debugfsdir &&
 213             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 214                             rdev->wiphy.debugfsdir,
 215                             rdev->wiphy.debugfsdir->d_parent,
 216                             newname))
 217                 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
 218                        newname);
 219
 220         nl80211_notify_dev_rename(rdev);
 221
 222         return 0;
 223 }
 224
 225 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 226                           struct net *net)
 227 {
 228         struct wireless_dev *wdev;
 229         int err = 0;
 230
 231         if (!rdev->wiphy.netnsok)
 232                 return -EOPNOTSUPP;
 233
 234         list_for_each_entry(wdev, &rdev->netdev_list, list) {
 235                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 236                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 237                 if (err)
 238                         break;
 239                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 240         }
 241
 242         if (err) {
 243                 /* failed -- clean up to old netns */
 244                 net = wiphy_net(&rdev->wiphy);
 245
 246                 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
 247                                                      list) {
 248                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 249                         err = dev_change_net_namespace(wdev->netdev, net,
 250                                                         "wlan%d");
 251                         WARN_ON(err);
 252                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 253                 }
 254         }
 255
 256         wiphy_net_set(&rdev->wiphy, net);
 257
 258         return err;
 259 }
 260
 261 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 262 {
 263         struct cfg80211_registered_device *rdev = data;
 264
 265         rdev->ops->rfkill_poll(&rdev->wiphy);
 266 }
 267
 268 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 269 {
 270         struct cfg80211_registered_device *rdev = data;
 271         struct wireless_dev *wdev;
 272
 273         if (!blocked)
 274                 return 0;
 275
 276         rtnl_lock();
 277         mutex_lock(&rdev->devlist_mtx);
 278
 279         list_for_each_entry(wdev, &rdev->netdev_list, list)
 280                 dev_close(wdev->netdev);
 281
 282         mutex_unlock(&rdev->devlist_mtx);
 283         rtnl_unlock();
 284
 285         return 0;
 286 }
 287
 288 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 289 {
 290         struct cfg80211_registered_device *rdev;
 291
 292         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 293         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 294 }
 295
 296 static void cfg80211_process_events(struct wireless_dev *wdev)
 297 {
 298         struct cfg80211_event *ev;
 299         unsigned long flags;
 300
 301         spin_lock_irqsave(&wdev->event_lock, flags);
 302         while (!list_empty(&wdev->event_list)) {
 303                 ev = list_first_entry(&wdev->event_list,
 304                                       struct cfg80211_event, list);
 305                 list_del(&ev->list);
 306                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 307
 308                 wdev_lock(wdev);
 309                 switch (ev->type) {
 310                 case EVENT_CONNECT_RESULT:
 311                         __cfg80211_connect_result(
 312                                 wdev->netdev, ev->cr.bssid,
 313                                 ev->cr.req_ie, ev->cr.req_ie_len,
 314                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
 315                                 ev->cr.status,
 316                                 ev->cr.status == WLAN_STATUS_SUCCESS,
 317                                 NULL);
 318                         break;
 319                 case EVENT_ROAMED:
 320                         __cfg80211_roamed(wdev, ev->rm.bssid,
 321                                           ev->rm.req_ie, ev->rm.req_ie_len,
 322                                           ev->rm.resp_ie, ev->rm.resp_ie_len);
 323                         break;
 324                 case EVENT_DISCONNECTED:
 325                         __cfg80211_disconnected(wdev->netdev,
 326                                                 ev->dc.ie, ev->dc.ie_len,
 327                                                 ev->dc.reason, true);
 328                         break;
 329                 case EVENT_IBSS_JOINED:
 330                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
 331                         break;
 332                 }
 333                 wdev_unlock(wdev);
 334
 335                 kfree(ev);
 336
 337                 spin_lock_irqsave(&wdev->event_lock, flags);
 338         }
 339         spin_unlock_irqrestore(&wdev->event_lock, flags);
 340 }
 341
 342 static void cfg80211_event_work(struct work_struct *work)
 343 {
 344         struct cfg80211_registered_device *rdev;
 345         struct wireless_dev *wdev;
 346
 347         rdev = container_of(work, struct cfg80211_registered_device,
 348                             event_work);
 349
 350         rtnl_lock();
 351         cfg80211_lock_rdev(rdev);
 352         mutex_lock(&rdev->devlist_mtx);
 353
 354         list_for_each_entry(wdev, &rdev->netdev_list, list)
 355                 cfg80211_process_events(wdev);
 356
 357         mutex_unlock(&rdev->devlist_mtx);
 358         cfg80211_unlock_rdev(rdev);
 359         rtnl_unlock();
 360 }
 361
 362 /* exported functions */
 363
 364 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 365 {
 366         static int wiphy_counter;
 367
 368         struct cfg80211_registered_device *rdev;
 369         int alloc_size;
 370
 371         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 372         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 373         WARN_ON(ops->connect && !ops->disconnect);
 374         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 375         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 376         WARN_ON(ops->add_station && !ops->del_station);
 377         WARN_ON(ops->add_mpath && !ops->del_mpath);
 378
 379         alloc_size = sizeof(*rdev) + sizeof_priv;
 380
 381         rdev = kzalloc(alloc_size, GFP_KERNEL);
 382         if (!rdev)
 383                 return NULL;
 384
 385         rdev->ops = ops;
 386
 387         mutex_lock(&cfg80211_mutex);
 388
 389         rdev->wiphy_idx = wiphy_counter++;
 390
 391         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
 392                 wiphy_counter--;
 393                 mutex_unlock(&cfg80211_mutex);
 394                 /* ugh, wrapped! */
 395                 kfree(rdev);
 396                 return NULL;
 397         }
 398
 399         mutex_unlock(&cfg80211_mutex);
 400
 401         /* give it a proper name */
 402         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 403
 404         mutex_init(&rdev->mtx);
 405         mutex_init(&rdev->devlist_mtx);
 406         INIT_LIST_HEAD(&rdev->netdev_list);
 407         spin_lock_init(&rdev->bss_lock);
 408         INIT_LIST_HEAD(&rdev->bss_list);
 409         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 410
 411         device_initialize(&rdev->wiphy.dev);
 412         rdev->wiphy.dev.class = &ieee80211_class;
 413         rdev->wiphy.dev.platform_data = rdev;
 414
 415         wiphy_net_set(&rdev->wiphy, &init_net);
 416
 417         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 418         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 419                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 420                                    &rdev->rfkill_ops, rdev);
 421
 422         if (!rdev->rfkill) {
 423                 kfree(rdev);
 424                 return NULL;
 425         }
 426
 427         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 428         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 429         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 430
 431         /*
 432          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 433          * Fragmentation and RTS threshold are disabled by default with the
 434          * special -1 value.
 435          */
 436         rdev->wiphy.retry_short = 7;
 437         rdev->wiphy.retry_long = 4;
 438         rdev->wiphy.frag_threshold = (u32) -1;
 439         rdev->wiphy.rts_threshold = (u32) -1;
 440
 441         return &rdev->wiphy;
 442 }
 443 EXPORT_SYMBOL(wiphy_new);
 444
 445 int wiphy_register(struct wiphy *wiphy)
 446 {
 447         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 448         int res;
 449         enum ieee80211_band band;
 450         struct ieee80211_supported_band *sband;
 451         bool have_band = false;
 452         int i;
 453         u16 ifmodes = wiphy->interface_modes;
 454
 455         /* sanity check ifmodes */
 456         WARN_ON(!ifmodes);
 457         ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
 458         if (WARN_ON(ifmodes != wiphy->interface_modes))
 459                 wiphy->interface_modes = ifmodes;
 460
 461         /* sanity check supported bands/channels */
 462         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 463                 sband = wiphy->bands[band];
 464                 if (!sband)
 465                         continue;
 466
 467                 sband->band = band;
 468
 469                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
 470                         return -EINVAL;
 471
 472                 /*
 473                  * Since we use a u32 for rate bitmaps in
 474                  * ieee80211_get_response_rate, we cannot
 475                  * have more than 32 legacy rates.
 476                  */
 477                 if (WARN_ON(sband->n_bitrates > 32))
 478                         return -EINVAL;
 479
 480                 for (i = 0; i < sband->n_channels; i++) {
 481                         sband->channels[i].orig_flags =
 482                                 sband->channels[i].flags;
 483                         sband->channels[i].orig_mag =
 484                                 sband->channels[i].max_antenna_gain;
 485                         sband->channels[i].orig_mpwr =
 486                                 sband->channels[i].max_power;
 487                         sband->channels[i].band = band;
 488                 }
 489
 490                 have_band = true;
 491         }
 492
 493         if (!have_band) {
 494                 WARN_ON(1);
 495                 return -EINVAL;
 496         }
 497
 498         /* check and set up bitrates */
 499         ieee80211_set_bitrate_flags(wiphy);
 500
 501         res = device_add(&rdev->wiphy.dev);
 502         if (res)
 503                 return res;
 504
 505         res = rfkill_register(rdev->rfkill);
 506         if (res)
 507                 goto out_rm_dev;
 508
 509         mutex_lock(&cfg80211_mutex);
 510
 511         /* set up regulatory info */
 512         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
 513
 514         list_add(&rdev->list, &cfg80211_rdev_list);
 515         cfg80211_rdev_list_generation++;
 516
 517         mutex_unlock(&cfg80211_mutex);
 518
 519         /* add to debugfs */
 520         rdev->wiphy.debugfsdir =
 521                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 522                                    ieee80211_debugfs_dir);
 523         if (IS_ERR(rdev->wiphy.debugfsdir))
 524                 rdev->wiphy.debugfsdir = NULL;
 525
 526         if (wiphy->custom_regulatory) {
 527                 struct regulatory_request request;
 528
 529                 request.wiphy_idx = get_wiphy_idx(wiphy);
 530                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 531                 request.alpha2[0] = '9';
 532                 request.alpha2[1] = '9';
 533
 534                 nl80211_send_reg_change_event(&request);
 535         }
 536
 537         cfg80211_debugfs_rdev_add(rdev);
 538
 539         return 0;
 540
 541  out_rm_dev:
 542         device_del(&rdev->wiphy.dev);
 543         return res;
 544 }
 545 EXPORT_SYMBOL(wiphy_register);
 546
 547 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 548 {
 549         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 550
 551         if (!rdev->ops->rfkill_poll)
 552                 return;
 553         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 554         rfkill_resume_polling(rdev->rfkill);
 555 }
 556 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 557
 558 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 559 {
 560         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 561
 562         rfkill_pause_polling(rdev->rfkill);
 563 }
 564 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 565
 566 void wiphy_unregister(struct wiphy *wiphy)
 567 {
 568         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 569
 570         rfkill_unregister(rdev->rfkill);
 571
 572         /* protect the device list */
 573         mutex_lock(&cfg80211_mutex);
 574
 575         BUG_ON(!list_empty(&rdev->netdev_list));
 576
 577         /*
 578          * Try to grab rdev->mtx. If a command is still in progress,
 579          * hopefully the driver will refuse it since it's tearing
 580          * down the device already. We wait for this command to complete
 581          * before unlinking the item from the list.
 582          * Note: as codified by the BUG_ON above we cannot get here if
 583          * a virtual interface is still associated. Hence, we can only
 584          * get to lock contention here if userspace issues a command
 585          * that identified the hardware by wiphy index.
 586          */
 587         mutex_lock(&rdev->mtx);
 588         /* unlock again before freeing */
 589         mutex_unlock(&rdev->mtx);
 590
 591         cfg80211_debugfs_rdev_del(rdev);
 592
 593         /* If this device got a regulatory hint tell core its
 594          * free to listen now to a new shiny device regulatory hint */
 595         reg_device_remove(wiphy);
 596
 597         list_del(&rdev->list);
 598         cfg80211_rdev_list_generation++;
 599         device_del(&rdev->wiphy.dev);
 600         debugfs_remove(rdev->wiphy.debugfsdir);
 601
 602         mutex_unlock(&cfg80211_mutex);
 603
 604         cancel_work_sync(&rdev->conn_work);
 605         cancel_work_sync(&rdev->scan_done_wk);
 606         kfree(rdev->scan_req);
 607         flush_work(&rdev->event_work);
 608 }
 609 EXPORT_SYMBOL(wiphy_unregister);
 610
 611 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 612 {
 613         struct cfg80211_internal_bss *scan, *tmp;
 614         rfkill_destroy(rdev->rfkill);
 615         mutex_destroy(&rdev->mtx);
 616         mutex_destroy(&rdev->devlist_mtx);
 617         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 618                 cfg80211_put_bss(&scan->pub);
 619         kfree(rdev);
 620 }
 621
 622 void wiphy_free(struct wiphy *wiphy)
 623 {
 624         put_device(&wiphy->dev);
 625 }
 626 EXPORT_SYMBOL(wiphy_free);
 627
 628 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 629 {
 630         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 631
 632         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 633                 schedule_work(&rdev->rfkill_sync);
 634 }
 635 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 636
 637 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
 638                                          unsigned long state,
 639                                          void *ndev)
 640 {
 641         struct net_device *dev = ndev;
 642         struct wireless_dev *wdev = dev->ieee80211_ptr;
 643         struct cfg80211_registered_device *rdev;
 644
 645         if (!wdev)
 646                 return NOTIFY_DONE;
 647
 648         rdev = wiphy_to_dev(wdev->wiphy);
 649
 650         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 651
 652         switch (state) {
 653         case NETDEV_REGISTER:
 654                 mutex_init(&wdev->mtx);
 655                 INIT_LIST_HEAD(&wdev->event_list);
 656                 spin_lock_init(&wdev->event_lock);
 657                 mutex_lock(&rdev->devlist_mtx);
 658                 list_add(&wdev->list, &rdev->netdev_list);
 659                 rdev->devlist_generation++;
 660                 /* can only change netns with wiphy */
 661                 dev->features |= NETIF_F_NETNS_LOCAL;
 662
 663                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 664                                       "phy80211")) {
 665                         printk(KERN_ERR "wireless: failed to add phy80211 "
 666                                 "symlink to netdev!\n");
 667                 }
 668                 wdev->netdev = dev;
 669                 wdev->sme_state = CFG80211_SME_IDLE;
 670                 mutex_unlock(&rdev->devlist_mtx);
 671 #ifdef CONFIG_WIRELESS_EXT
 672                 if (!dev->wireless_handlers)
 673                         dev->wireless_handlers = &cfg80211_wext_handler;
 674                 wdev->wext.default_key = -1;
 675                 wdev->wext.default_mgmt_key = -1;
 676                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 677                 wdev->wext.ps = CONFIG_CFG80211_DEFAULT_PS_VALUE;
 678                 wdev->wext.ps_timeout = 100;
 679                 if (rdev->ops->set_power_mgmt)
 680                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
 681                                                       wdev->wext.ps,
 682                                                       wdev->wext.ps_timeout)) {
 683                                 /* assume this means it's off */
 684                                 wdev->wext.ps = false;
 685                         }
 686 #endif
 687                 break;
 688         case NETDEV_GOING_DOWN:
 689                 switch (wdev->iftype) {
 690                 case NL80211_IFTYPE_ADHOC:
 691                         cfg80211_leave_ibss(rdev, dev, true);
 692                         break;
 693                 case NL80211_IFTYPE_STATION:
 694                         wdev_lock(wdev);
 695 #ifdef CONFIG_WIRELESS_EXT
 696                         kfree(wdev->wext.ie);
 697                         wdev->wext.ie = NULL;
 698                         wdev->wext.ie_len = 0;
 699                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 700 #endif
 701                         __cfg80211_disconnect(rdev, dev,
 702                                               WLAN_REASON_DEAUTH_LEAVING, true);
 703                         cfg80211_mlme_down(rdev, dev);
 704                         wdev_unlock(wdev);
 705                         break;
 706                 default:
 707                         break;
 708                 }
 709                 break;
 710         case NETDEV_UP:
 711 #ifdef CONFIG_WIRELESS_EXT
 712                 cfg80211_lock_rdev(rdev);
 713                 mutex_lock(&rdev->devlist_mtx);
 714                 wdev_lock(wdev);
 715                 switch (wdev->iftype) {
 716                 case NL80211_IFTYPE_ADHOC:
 717                         cfg80211_ibss_wext_join(rdev, wdev);
 718                         break;
 719                 case NL80211_IFTYPE_STATION:
 720                         cfg80211_mgd_wext_connect(rdev, wdev);
 721                         break;
 722                 default:
 723                         break;
 724                 }
 725                 wdev_unlock(wdev);
 726                 mutex_unlock(&rdev->devlist_mtx);
 727                 cfg80211_unlock_rdev(rdev);
 728 #endif
 729                 break;
 730         case NETDEV_UNREGISTER:
 731                 mutex_lock(&rdev->devlist_mtx);
 732                 /*
 733                  * It is possible to get NETDEV_UNREGISTER
 734                  * multiple times. To detect that, check
 735                  * that the interface is still on the list
 736                  * of registered interfaces, and only then
 737                  * remove and clean it up.
 738                  */
 739                 if (!list_empty(&wdev->list)) {
 740                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 741                         list_del_init(&wdev->list);
 742                         rdev->devlist_generation++;
 743                         mutex_destroy(&wdev->mtx);
 744 #ifdef CONFIG_WIRELESS_EXT
 745                         kfree(wdev->wext.keys);
 746 #endif
 747                 }
 748                 mutex_unlock(&rdev->devlist_mtx);
 749                 break;
 750         case NETDEV_PRE_UP:
 751                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 752                         return notifier_from_errno(-EOPNOTSUPP);
 753                 if (rfkill_blocked(rdev->rfkill))
 754                         return notifier_from_errno(-ERFKILL);
 755                 break;
 756         }
 757
 758         return NOTIFY_DONE;
 759 }
 760
 761 static struct notifier_block cfg80211_netdev_notifier = {
 762         .notifier_call = cfg80211_netdev_notifier_call,
 763 };
 764
 765 static void __net_exit cfg80211_pernet_exit(struct net *net)
 766 {
 767         struct cfg80211_registered_device *rdev;
 768
 769         rtnl_lock();
 770         mutex_lock(&cfg80211_mutex);
 771         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 772                 if (net_eq(wiphy_net(&rdev->wiphy), net))
 773                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
 774         }
 775         mutex_unlock(&cfg80211_mutex);
 776         rtnl_unlock();
 777 }
 778
 779 static struct pernet_operations cfg80211_pernet_ops = {
 780         .exit = cfg80211_pernet_exit,
 781 };
 782
 783 static int __init cfg80211_init(void)
 784 {
 785         int err;
 786
 787         err = register_pernet_device(&cfg80211_pernet_ops);
 788         if (err)
 789                 goto out_fail_pernet;
 790
 791         err = wiphy_sysfs_init();
 792         if (err)
 793                 goto out_fail_sysfs;
 794
 795         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
 796         if (err)
 797                 goto out_fail_notifier;
 798
 799         err = nl80211_init();
 800         if (err)
 801                 goto out_fail_nl80211;
 802
 803         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
 804
 805         err = regulatory_init();
 806         if (err)
 807                 goto out_fail_reg;
 808
 809         return 0;
 810
 811 out_fail_reg:
 812         debugfs_remove(ieee80211_debugfs_dir);
 813 out_fail_nl80211:
 814         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 815 out_fail_notifier:
 816         wiphy_sysfs_exit();
 817 out_fail_sysfs:
 818         unregister_pernet_device(&cfg80211_pernet_ops);
 819 out_fail_pernet:
 820         return err;
 821 }
 822 subsys_initcall(cfg80211_init);
 823
 824 static void cfg80211_exit(void)
 825 {
 826         debugfs_remove(ieee80211_debugfs_dir);
 827         nl80211_exit();
 828         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 829         wiphy_sysfs_exit();
 830         regulatory_exit();
 831         unregister_pernet_device(&cfg80211_pernet_ops);
 832 }
 833 module_exit(cfg80211_exit);