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         rdev->wiphy.ps_default = CONFIG_CFG80211_DEFAULT_PS_VALUE;
 416
 417         wiphy_net_set(&rdev->wiphy, &init_net);
 418
 419         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 420         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 421                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 422                                    &rdev->rfkill_ops, rdev);
 423
 424         if (!rdev->rfkill) {
 425                 kfree(rdev);
 426                 return NULL;
 427         }
 428
 429         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 430         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 431         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 432
 433         /*
 434          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 435          * Fragmentation and RTS threshold are disabled by default with the
 436          * special -1 value.
 437          */
 438         rdev->wiphy.retry_short = 7;
 439         rdev->wiphy.retry_long = 4;
 440         rdev->wiphy.frag_threshold = (u32) -1;
 441         rdev->wiphy.rts_threshold = (u32) -1;
 442
 443         return &rdev->wiphy;
 444 }
 445 EXPORT_SYMBOL(wiphy_new);
 446
 447 int wiphy_register(struct wiphy *wiphy)
 448 {
 449         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 450         int res;
 451         enum ieee80211_band band;
 452         struct ieee80211_supported_band *sband;
 453         bool have_band = false;
 454         int i;
 455         u16 ifmodes = wiphy->interface_modes;
 456
 457         /* sanity check ifmodes */
 458         WARN_ON(!ifmodes);
 459         ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
 460         if (WARN_ON(ifmodes != wiphy->interface_modes))
 461                 wiphy->interface_modes = ifmodes;
 462
 463         /* sanity check supported bands/channels */
 464         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 465                 sband = wiphy->bands[band];
 466                 if (!sband)
 467                         continue;
 468
 469                 sband->band = band;
 470
 471                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
 472                         return -EINVAL;
 473
 474                 /*
 475                  * Since we use a u32 for rate bitmaps in
 476                  * ieee80211_get_response_rate, we cannot
 477                  * have more than 32 legacy rates.
 478                  */
 479                 if (WARN_ON(sband->n_bitrates > 32))
 480                         return -EINVAL;
 481
 482                 for (i = 0; i < sband->n_channels; i++) {
 483                         sband->channels[i].orig_flags =
 484                                 sband->channels[i].flags;
 485                         sband->channels[i].orig_mag =
 486                                 sband->channels[i].max_antenna_gain;
 487                         sband->channels[i].orig_mpwr =
 488                                 sband->channels[i].max_power;
 489                         sband->channels[i].band = band;
 490                 }
 491
 492                 have_band = true;
 493         }
 494
 495         if (!have_band) {
 496                 WARN_ON(1);
 497                 return -EINVAL;
 498         }
 499
 500         /* check and set up bitrates */
 501         ieee80211_set_bitrate_flags(wiphy);
 502
 503         res = device_add(&rdev->wiphy.dev);
 504         if (res)
 505                 return res;
 506
 507         res = rfkill_register(rdev->rfkill);
 508         if (res)
 509                 goto out_rm_dev;
 510
 511         mutex_lock(&cfg80211_mutex);
 512
 513         /* set up regulatory info */
 514         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
 515
 516         list_add(&rdev->list, &cfg80211_rdev_list);
 517         cfg80211_rdev_list_generation++;
 518
 519         mutex_unlock(&cfg80211_mutex);
 520
 521         /* add to debugfs */
 522         rdev->wiphy.debugfsdir =
 523                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 524                                    ieee80211_debugfs_dir);
 525         if (IS_ERR(rdev->wiphy.debugfsdir))
 526                 rdev->wiphy.debugfsdir = NULL;
 527
 528         if (wiphy->custom_regulatory) {
 529                 struct regulatory_request request;
 530
 531                 request.wiphy_idx = get_wiphy_idx(wiphy);
 532                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 533                 request.alpha2[0] = '9';
 534                 request.alpha2[1] = '9';
 535
 536                 nl80211_send_reg_change_event(&request);
 537         }
 538
 539         cfg80211_debugfs_rdev_add(rdev);
 540
 541         return 0;
 542
 543  out_rm_dev:
 544         device_del(&rdev->wiphy.dev);
 545         return res;
 546 }
 547 EXPORT_SYMBOL(wiphy_register);
 548
 549 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 550 {
 551         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 552
 553         if (!rdev->ops->rfkill_poll)
 554                 return;
 555         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 556         rfkill_resume_polling(rdev->rfkill);
 557 }
 558 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 559
 560 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 561 {
 562         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 563
 564         rfkill_pause_polling(rdev->rfkill);
 565 }
 566 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 567
 568 void wiphy_unregister(struct wiphy *wiphy)
 569 {
 570         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 571
 572         rfkill_unregister(rdev->rfkill);
 573
 574         /* protect the device list */
 575         mutex_lock(&cfg80211_mutex);
 576
 577         BUG_ON(!list_empty(&rdev->netdev_list));
 578
 579         /*
 580          * Try to grab rdev->mtx. If a command is still in progress,
 581          * hopefully the driver will refuse it since it's tearing
 582          * down the device already. We wait for this command to complete
 583          * before unlinking the item from the list.
 584          * Note: as codified by the BUG_ON above we cannot get here if
 585          * a virtual interface is still associated. Hence, we can only
 586          * get to lock contention here if userspace issues a command
 587          * that identified the hardware by wiphy index.
 588          */
 589         cfg80211_lock_rdev(rdev);
 590
 591         if (WARN_ON(rdev->scan_req)) {
 592                 rdev->scan_req->aborted = true;
 593                 ___cfg80211_scan_done(rdev);
 594         }
 595
 596         cfg80211_unlock_rdev(rdev);
 597
 598         cfg80211_debugfs_rdev_del(rdev);
 599
 600         /* If this device got a regulatory hint tell core its
 601          * free to listen now to a new shiny device regulatory hint */
 602         reg_device_remove(wiphy);
 603
 604         list_del(&rdev->list);
 605         cfg80211_rdev_list_generation++;
 606         device_del(&rdev->wiphy.dev);
 607         debugfs_remove(rdev->wiphy.debugfsdir);
 608
 609         mutex_unlock(&cfg80211_mutex);
 610
 611         flush_work(&rdev->scan_done_wk);
 612         cancel_work_sync(&rdev->conn_work);
 613         flush_work(&rdev->event_work);
 614 }
 615 EXPORT_SYMBOL(wiphy_unregister);
 616
 617 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 618 {
 619         struct cfg80211_internal_bss *scan, *tmp;
 620         rfkill_destroy(rdev->rfkill);
 621         mutex_destroy(&rdev->mtx);
 622         mutex_destroy(&rdev->devlist_mtx);
 623         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 624                 cfg80211_put_bss(&scan->pub);
 625         kfree(rdev);
 626 }
 627
 628 void wiphy_free(struct wiphy *wiphy)
 629 {
 630         put_device(&wiphy->dev);
 631 }
 632 EXPORT_SYMBOL(wiphy_free);
 633
 634 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 635 {
 636         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 637
 638         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 639                 schedule_work(&rdev->rfkill_sync);
 640 }
 641 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 642
 643 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
 644                                          unsigned long state,
 645                                          void *ndev)
 646 {
 647         struct net_device *dev = ndev;
 648         struct wireless_dev *wdev = dev->ieee80211_ptr;
 649         struct cfg80211_registered_device *rdev;
 650
 651         if (!wdev)
 652                 return NOTIFY_DONE;
 653
 654         rdev = wiphy_to_dev(wdev->wiphy);
 655
 656         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 657
 658         switch (state) {
 659         case NETDEV_REGISTER:
 660                 /*
 661                  * NB: cannot take rdev->mtx here because this may be
 662                  * called within code protected by it when interfaces
 663                  * are added with nl80211.
 664                  */
 665                 mutex_init(&wdev->mtx);
 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_WIRELESS_EXT
 683                 if (!dev->wireless_handlers)
 684                         dev->wireless_handlers = &cfg80211_wext_handler;
 685                 wdev->wext.default_key = -1;
 686                 wdev->wext.default_mgmt_key = -1;
 687                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 688                 wdev->wext.ps = wdev->wiphy->ps_default;
 689                 wdev->wext.ps_timeout = 100;
 690                 if (rdev->ops->set_power_mgmt)
 691                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
 692                                                       wdev->wext.ps,
 693                                                       wdev->wext.ps_timeout)) {
 694                                 /* assume this means it's off */
 695                                 wdev->wext.ps = false;
 696                         }
 697 #endif
 698                 break;
 699         case NETDEV_GOING_DOWN:
 700                 switch (wdev->iftype) {
 701                 case NL80211_IFTYPE_ADHOC:
 702                         cfg80211_leave_ibss(rdev, dev, true);
 703                         break;
 704                 case NL80211_IFTYPE_STATION:
 705                         wdev_lock(wdev);
 706 #ifdef CONFIG_WIRELESS_EXT
 707                         kfree(wdev->wext.ie);
 708                         wdev->wext.ie = NULL;
 709                         wdev->wext.ie_len = 0;
 710                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 711 #endif
 712                         __cfg80211_disconnect(rdev, dev,
 713                                               WLAN_REASON_DEAUTH_LEAVING, true);
 714                         cfg80211_mlme_down(rdev, dev);
 715                         wdev_unlock(wdev);
 716                         break;
 717                 default:
 718                         break;
 719                 }
 720                 break;
 721         case NETDEV_UP:
 722 #ifdef CONFIG_WIRELESS_EXT
 723                 cfg80211_lock_rdev(rdev);
 724                 mutex_lock(&rdev->devlist_mtx);
 725                 wdev_lock(wdev);
 726                 switch (wdev->iftype) {
 727                 case NL80211_IFTYPE_ADHOC:
 728                         cfg80211_ibss_wext_join(rdev, wdev);
 729                         break;
 730                 case NL80211_IFTYPE_STATION:
 731                         cfg80211_mgd_wext_connect(rdev, wdev);
 732                         break;
 733                 default:
 734                         break;
 735                 }
 736                 wdev_unlock(wdev);
 737                 mutex_unlock(&rdev->devlist_mtx);
 738                 cfg80211_unlock_rdev(rdev);
 739 #endif
 740                 break;
 741         case NETDEV_UNREGISTER:
 742                 /*
 743                  * NB: cannot take rdev->mtx here because this may be
 744                  * called within code protected by it when interfaces
 745                  * are removed with nl80211.
 746                  */
 747                 mutex_lock(&rdev->devlist_mtx);
 748                 /*
 749                  * It is possible to get NETDEV_UNREGISTER
 750                  * multiple times. To detect that, check
 751                  * that the interface is still on the list
 752                  * of registered interfaces, and only then
 753                  * remove and clean it up.
 754                  */
 755                 if (!list_empty(&wdev->list)) {
 756                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 757                         list_del_init(&wdev->list);
 758                         rdev->devlist_generation++;
 759                         mutex_destroy(&wdev->mtx);
 760 #ifdef CONFIG_WIRELESS_EXT
 761                         kfree(wdev->wext.keys);
 762 #endif
 763                 }
 764                 mutex_unlock(&rdev->devlist_mtx);
 765                 break;
 766         case NETDEV_PRE_UP:
 767                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 768                         return notifier_from_errno(-EOPNOTSUPP);
 769                 if (rfkill_blocked(rdev->rfkill))
 770                         return notifier_from_errno(-ERFKILL);
 771                 break;
 772         }
 773
 774         return NOTIFY_DONE;
 775 }
 776
 777 static struct notifier_block cfg80211_netdev_notifier = {
 778         .notifier_call = cfg80211_netdev_notifier_call,
 779 };
 780
 781 static void __net_exit cfg80211_pernet_exit(struct net *net)
 782 {
 783         struct cfg80211_registered_device *rdev;
 784
 785         rtnl_lock();
 786         mutex_lock(&cfg80211_mutex);
 787         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 788                 if (net_eq(wiphy_net(&rdev->wiphy), net))
 789                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
 790         }
 791         mutex_unlock(&cfg80211_mutex);
 792         rtnl_unlock();
 793 }
 794
 795 static struct pernet_operations cfg80211_pernet_ops = {
 796         .exit = cfg80211_pernet_exit,
 797 };
 798
 799 static int __init cfg80211_init(void)
 800 {
 801         int err;
 802
 803         err = register_pernet_device(&cfg80211_pernet_ops);
 804         if (err)
 805                 goto out_fail_pernet;
 806
 807         err = wiphy_sysfs_init();
 808         if (err)
 809                 goto out_fail_sysfs;
 810
 811         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
 812         if (err)
 813                 goto out_fail_notifier;
 814
 815         err = nl80211_init();
 816         if (err)
 817                 goto out_fail_nl80211;
 818
 819         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
 820
 821         err = regulatory_init();
 822         if (err)
 823                 goto out_fail_reg;
 824
 825         return 0;
 826
 827 out_fail_reg:
 828         debugfs_remove(ieee80211_debugfs_dir);
 829 out_fail_nl80211:
 830         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 831 out_fail_notifier:
 832         wiphy_sysfs_exit();
 833 out_fail_sysfs:
 834         unregister_pernet_device(&cfg80211_pernet_ops);
 835 out_fail_pernet:
 836         return err;
 837 }
 838 subsys_initcall(cfg80211_init);
 839
 840 static void cfg80211_exit(void)
 841 {
 842         debugfs_remove(ieee80211_debugfs_dir);
 843         nl80211_exit();
 844         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 845         wiphy_sysfs_exit();
 846         regulatory_exit();
 847         unregister_pernet_device(&cfg80211_pernet_ops);
 848 }
 849 module_exit(cfg80211_exit);