SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/wireless/core.c

   1 /*
   2  * This is the linux wireless configuration interface.
   3  *
   4  * Copyright 2006-2009          Johannes Berg <johannes@sipsolutions.net>
   5  */
   6
   7 #include <linux/if.h>
   8 #include <linux/module.h>
   9 #include <linux/err.h>
  10 #include <linux/list.h>
  11 #include <linux/nl80211.h>
  12 #include <linux/debugfs.h>
  13 #include <linux/notifier.h>
  14 #include <linux/device.h>
  15 #include <linux/rtnetlink.h>
  16 #include <net/genetlink.h>
  17 #include <net/cfg80211.h>
  18 #include "nl80211.h"
  19 #include "core.h"
  20 #include "sysfs.h"
  21 #include "debugfs.h"
  22 #include "wext-compat.h"
  23
  24 /* name for sysfs, %d is appended */
  25 #define PHY_NAME "phy"
  26
  27 MODULE_AUTHOR("Johannes Berg");
  28 MODULE_LICENSE("GPL");
  29 MODULE_DESCRIPTION("wireless configuration support");
  30
  31 /* RCU might be appropriate here since we usually
  32  * only read the list, and that can happen quite
  33  * often because we need to do it for each command */
  34 LIST_HEAD(cfg80211_rdev_list);
  35
  36 /*
  37  * This is used to protect the cfg80211_rdev_list, cfg80211_regdomain,
  38  * country_ie_regdomain, the reg_beacon_list and the the last regulatory
  39  * request receipt (last_request).
  40  */
  41 DEFINE_MUTEX(cfg80211_mutex);
  42
  43 /* for debugfs */
  44 static struct dentry *ieee80211_debugfs_dir;
  45
  46 /* requires cfg80211_mutex to be held! */
  47 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  48 {
  49         struct cfg80211_registered_device *result = NULL, *rdev;
  50
  51         if (!wiphy_idx_valid(wiphy_idx))
  52                 return NULL;
  53
  54         assert_cfg80211_lock();
  55
  56         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  57                 if (rdev->wiphy_idx == wiphy_idx) {
  58                         result = rdev;
  59                         break;
  60                 }
  61         }
  62
  63         return result;
  64 }
  65
  66 int get_wiphy_idx(struct wiphy *wiphy)
  67 {
  68         struct cfg80211_registered_device *rdev;
  69         if (!wiphy)
  70                 return WIPHY_IDX_STALE;
  71         rdev = wiphy_to_dev(wiphy);
  72         return rdev->wiphy_idx;
  73 }
  74
  75 /* requires cfg80211_rdev_mutex to be held! */
  76 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  77 {
  78         struct cfg80211_registered_device *rdev;
  79
  80         if (!wiphy_idx_valid(wiphy_idx))
  81                 return NULL;
  82
  83         assert_cfg80211_lock();
  84
  85         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  86         if (!rdev)
  87                 return NULL;
  88         return &rdev->wiphy;
  89 }
  90
  91 /* requires cfg80211_mutex to be held! */
  92 struct cfg80211_registered_device *
  93 __cfg80211_rdev_from_info(struct genl_info *info)
  94 {
  95         int ifindex;
  96         struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
  97         struct net_device *dev;
  98         int err = -EINVAL;
  99
 100         assert_cfg80211_lock();
 101
 102         if (info->attrs[NL80211_ATTR_WIPHY]) {
 103                 bywiphyidx = cfg80211_rdev_by_wiphy_idx(
 104                                 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
 105                 err = -ENODEV;
 106         }
 107
 108         if (info->attrs[NL80211_ATTR_IFINDEX]) {
 109                 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
 110                 dev = dev_get_by_index(genl_info_net(info), ifindex);
 111                 if (dev) {
 112                         if (dev->ieee80211_ptr)
 113                                 byifidx =
 114                                         wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 115                         dev_put(dev);
 116                 }
 117                 err = -ENODEV;
 118         }
 119
 120         if (bywiphyidx && byifidx) {
 121                 if (bywiphyidx != byifidx)
 122                         return ERR_PTR(-EINVAL);
 123                 else
 124                         return bywiphyidx; /* == byifidx */
 125         }
 126         if (bywiphyidx)
 127                 return bywiphyidx;
 128
 129         if (byifidx)
 130                 return byifidx;
 131
 132         return ERR_PTR(err);
 133 }
 134
 135 struct cfg80211_registered_device *
 136 cfg80211_get_dev_from_info(struct genl_info *info)
 137 {
 138         struct cfg80211_registered_device *rdev;
 139
 140         mutex_lock(&cfg80211_mutex);
 141         rdev = __cfg80211_rdev_from_info(info);
 142
 143         /* if it is not an error we grab the lock on
 144          * it to assure it won't be going away while
 145          * we operate on it */
 146         if (!IS_ERR(rdev))
 147                 mutex_lock(&rdev->mtx);
 148
 149         mutex_unlock(&cfg80211_mutex);
 150
 151         return rdev;
 152 }
 153
 154 struct cfg80211_registered_device *
 155 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
 156 {
 157         struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
 158         struct net_device *dev;
 159
 160         mutex_lock(&cfg80211_mutex);
 161         dev = dev_get_by_index(net, ifindex);
 162         if (!dev)
 163                 goto out;
 164         if (dev->ieee80211_ptr) {
 165                 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 166                 mutex_lock(&rdev->mtx);
 167         } else
 168                 rdev = ERR_PTR(-ENODEV);
 169         dev_put(dev);
 170  out:
 171         mutex_unlock(&cfg80211_mutex);
 172         return rdev;
 173 }
 174
 175 /* requires cfg80211_mutex to be held */
 176 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 177                         char *newname)
 178 {
 179         struct cfg80211_registered_device *rdev2;
 180         int wiphy_idx, taken = -1, result, digits;
 181
 182         assert_cfg80211_lock();
 183
 184         /* prohibit calling the thing phy%d when %d is not its number */
 185         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 186         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 187                 /* count number of places needed to print wiphy_idx */
 188                 digits = 1;
 189                 while (wiphy_idx /= 10)
 190                         digits++;
 191                 /*
 192                  * deny the name if it is phy<idx> where <idx> is printed
 193                  * without leading zeroes. taken == strlen(newname) here
 194                  */
 195                 if (taken == strlen(PHY_NAME) + digits)
 196                         return -EINVAL;
 197         }
 198
 199
 200         /* Ignore nop renames */
 201         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
 202                 return 0;
 203
 204         /* Ensure another device does not already have this name. */
 205         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 206                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
 207                         return -EINVAL;
 208
 209         result = device_rename(&rdev->wiphy.dev, newname);
 210         if (result)
 211                 return result;
 212
 213         if (rdev->wiphy.debugfsdir &&
 214             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 215                             rdev->wiphy.debugfsdir,
 216                             rdev->wiphy.debugfsdir->d_parent,
 217                             newname))
 218                 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
 219                        newname);
 220
 221         nl80211_notify_dev_rename(rdev);
 222
 223         return 0;
 224 }
 225
 226 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 227                           struct net *net)
 228 {
 229         struct wireless_dev *wdev;
 230         int err = 0;
 231
 232         if (!rdev->wiphy.netnsok)
 233                 return -EOPNOTSUPP;
 234
 235         list_for_each_entry(wdev, &rdev->netdev_list, list) {
 236                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 237                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 238                 if (err)
 239                         break;
 240                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 241         }
 242
 243         if (err) {
 244                 /* failed -- clean up to old netns */
 245                 net = wiphy_net(&rdev->wiphy);
 246
 247                 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
 248                                                      list) {
 249                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 250                         err = dev_change_net_namespace(wdev->netdev, net,
 251                                                         "wlan%d");
 252                         WARN_ON(err);
 253                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 254                 }
 255         }
 256
 257         wiphy_net_set(&rdev->wiphy, net);
 258
 259         return err;
 260 }
 261
 262 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 263 {
 264         struct cfg80211_registered_device *rdev = data;
 265
 266         rdev->ops->rfkill_poll(&rdev->wiphy);
 267 }
 268
 269 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 270 {
 271         struct cfg80211_registered_device *rdev = data;
 272         struct wireless_dev *wdev;
 273
 274         if (!blocked)
 275                 return 0;
 276
 277         rtnl_lock();
 278         mutex_lock(&rdev->devlist_mtx);
 279
 280         list_for_each_entry(wdev, &rdev->netdev_list, list)
 281                 dev_close(wdev->netdev);
 282
 283         mutex_unlock(&rdev->devlist_mtx);
 284         rtnl_unlock();
 285
 286         return 0;
 287 }
 288
 289 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 290 {
 291         struct cfg80211_registered_device *rdev;
 292
 293         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 294         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 295 }
 296
 297 static void cfg80211_process_events(struct wireless_dev *wdev)
 298 {
 299         struct cfg80211_event *ev;
 300         unsigned long flags;
 301
 302         spin_lock_irqsave(&wdev->event_lock, flags);
 303         while (!list_empty(&wdev->event_list)) {
 304                 ev = list_first_entry(&wdev->event_list,
 305                                       struct cfg80211_event, list);
 306                 list_del(&ev->list);
 307                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 308
 309                 wdev_lock(wdev);
 310                 switch (ev->type) {
 311                 case EVENT_CONNECT_RESULT:
 312                         __cfg80211_connect_result(
 313                                 wdev->netdev, ev->cr.bssid,
 314                                 ev->cr.req_ie, ev->cr.req_ie_len,
 315                                 ev->cr.resp_ie, ev->cr.resp_ie_len,
 316                                 ev->cr.status,
 317                                 ev->cr.status == WLAN_STATUS_SUCCESS,
 318                                 NULL);
 319                         break;
 320                 case EVENT_ROAMED:
 321                         __cfg80211_roamed(wdev, ev->rm.bssid,
 322                                           ev->rm.req_ie, ev->rm.req_ie_len,
 323                                           ev->rm.resp_ie, ev->rm.resp_ie_len);
 324                         break;
 325                 case EVENT_DISCONNECTED:
 326                         __cfg80211_disconnected(wdev->netdev,
 327                                                 ev->dc.ie, ev->dc.ie_len,
 328                                                 ev->dc.reason, true);
 329                         break;
 330                 case EVENT_IBSS_JOINED:
 331                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
 332                         break;
 333                 }
 334                 wdev_unlock(wdev);
 335
 336                 kfree(ev);
 337
 338                 spin_lock_irqsave(&wdev->event_lock, flags);
 339         }
 340         spin_unlock_irqrestore(&wdev->event_lock, flags);
 341 }
 342
 343 static void cfg80211_event_work(struct work_struct *work)
 344 {
 345         struct cfg80211_registered_device *rdev;
 346         struct wireless_dev *wdev;
 347
 348         rdev = container_of(work, struct cfg80211_registered_device,
 349                             event_work);
 350
 351         rtnl_lock();
 352         cfg80211_lock_rdev(rdev);
 353         mutex_lock(&rdev->devlist_mtx);
 354
 355         list_for_each_entry(wdev, &rdev->netdev_list, list)
 356                 cfg80211_process_events(wdev);
 357
 358         mutex_unlock(&rdev->devlist_mtx);
 359         cfg80211_unlock_rdev(rdev);
 360         rtnl_unlock();
 361 }
 362
 363 /* exported functions */
 364
 365 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 366 {
 367         static int wiphy_counter;
 368
 369         struct cfg80211_registered_device *rdev;
 370         int alloc_size;
 371
 372         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 373         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 374         WARN_ON(ops->connect && !ops->disconnect);
 375         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 376         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 377         WARN_ON(ops->add_station && !ops->del_station);
 378         WARN_ON(ops->add_mpath && !ops->del_mpath);
 379
 380         alloc_size = sizeof(*rdev) + sizeof_priv;
 381
 382         rdev = kzalloc(alloc_size, GFP_KERNEL);
 383         if (!rdev)
 384                 return NULL;
 385
 386         rdev->ops = ops;
 387
 388         mutex_lock(&cfg80211_mutex);
 389
 390         rdev->wiphy_idx = wiphy_counter++;
 391
 392         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
 393                 wiphy_counter--;
 394                 mutex_unlock(&cfg80211_mutex);
 395                 /* ugh, wrapped! */
 396                 kfree(rdev);
 397                 return NULL;
 398         }
 399
 400         mutex_unlock(&cfg80211_mutex);
 401
 402         /* give it a proper name */
 403         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 404
 405         mutex_init(&rdev->mtx);
 406         mutex_init(&rdev->devlist_mtx);
 407         INIT_LIST_HEAD(&rdev->netdev_list);
 408         spin_lock_init(&rdev->bss_lock);
 409         INIT_LIST_HEAD(&rdev->bss_list);
 410         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 411
 412         device_initialize(&rdev->wiphy.dev);
 413         rdev->wiphy.dev.class = &ieee80211_class;
 414         rdev->wiphy.dev.platform_data = rdev;
 415
 416         wiphy_net_set(&rdev->wiphy, &init_net);
 417
 418         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 419         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 420                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 421                                    &rdev->rfkill_ops, rdev);
 422
 423         if (!rdev->rfkill) {
 424                 kfree(rdev);
 425                 return NULL;
 426         }
 427
 428         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 429         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 430         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 431
 432         /*
 433          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 434          * Fragmentation and RTS threshold are disabled by default with the
 435          * special -1 value.
 436          */
 437         rdev->wiphy.retry_short = 7;
 438         rdev->wiphy.retry_long = 4;
 439         rdev->wiphy.frag_threshold = (u32) -1;
 440         rdev->wiphy.rts_threshold = (u32) -1;
 441
 442         return &rdev->wiphy;
 443 }
 444 EXPORT_SYMBOL(wiphy_new);
 445
 446 int wiphy_register(struct wiphy *wiphy)
 447 {
 448         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 449         int res;
 450         enum ieee80211_band band;
 451         struct ieee80211_supported_band *sband;
 452         bool have_band = false;
 453         int i;
 454         u16 ifmodes = wiphy->interface_modes;
 455
 456         /* sanity check ifmodes */
 457         WARN_ON(!ifmodes);
 458         ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
 459         if (WARN_ON(ifmodes != wiphy->interface_modes))
 460                 wiphy->interface_modes = ifmodes;
 461
 462         /* sanity check supported bands/channels */
 463         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 464                 sband = wiphy->bands[band];
 465                 if (!sband)
 466                         continue;
 467
 468                 sband->band = band;
 469
 470                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
 471                         return -EINVAL;
 472
 473                 /*
 474                  * Since we use a u32 for rate bitmaps in
 475                  * ieee80211_get_response_rate, we cannot
 476                  * have more than 32 legacy rates.
 477                  */
 478                 if (WARN_ON(sband->n_bitrates > 32))
 479                         return -EINVAL;
 480
 481                 for (i = 0; i < sband->n_channels; i++) {
 482                         sband->channels[i].orig_flags =
 483                                 sband->channels[i].flags;
 484                         sband->channels[i].orig_mag =
 485                                 sband->channels[i].max_antenna_gain;
 486                         sband->channels[i].orig_mpwr =
 487                                 sband->channels[i].max_power;
 488                         sband->channels[i].band = band;
 489                 }
 490
 491                 have_band = true;
 492         }
 493
 494         if (!have_band) {
 495                 WARN_ON(1);
 496                 return -EINVAL;
 497         }
 498
 499         /* check and set up bitrates */
 500         ieee80211_set_bitrate_flags(wiphy);
 501
 502         res = device_add(&rdev->wiphy.dev);
 503         if (res)
 504                 return res;
 505
 506         res = rfkill_register(rdev->rfkill);
 507         if (res)
 508                 goto out_rm_dev;
 509
 510         mutex_lock(&cfg80211_mutex);
 511
 512         /* set up regulatory info */
 513         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
 514
 515         list_add(&rdev->list, &cfg80211_rdev_list);
 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         device_del(&rdev->wiphy.dev);
 599         debugfs_remove(rdev->wiphy.debugfsdir);
 600
 601         mutex_unlock(&cfg80211_mutex);
 602
 603         cancel_work_sync(&rdev->conn_work);
 604         cancel_work_sync(&rdev->scan_done_wk);
 605         kfree(rdev->scan_req);
 606         flush_work(&rdev->event_work);
 607 }
 608 EXPORT_SYMBOL(wiphy_unregister);
 609
 610 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 611 {
 612         struct cfg80211_internal_bss *scan, *tmp;
 613         rfkill_destroy(rdev->rfkill);
 614         mutex_destroy(&rdev->mtx);
 615         mutex_destroy(&rdev->devlist_mtx);
 616         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 617                 cfg80211_put_bss(&scan->pub);
 618         kfree(rdev);
 619 }
 620
 621 void wiphy_free(struct wiphy *wiphy)
 622 {
 623         put_device(&wiphy->dev);
 624 }
 625 EXPORT_SYMBOL(wiphy_free);
 626
 627 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 628 {
 629         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 630
 631         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 632                 schedule_work(&rdev->rfkill_sync);
 633 }
 634 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 635
 636 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
 637                                          unsigned long state,
 638                                          void *ndev)
 639 {
 640         struct net_device *dev = ndev;
 641         struct wireless_dev *wdev = dev->ieee80211_ptr;
 642         struct cfg80211_registered_device *rdev;
 643
 644         if (!wdev)
 645                 return NOTIFY_DONE;
 646
 647         rdev = wiphy_to_dev(wdev->wiphy);
 648
 649         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 650
 651         switch (state) {
 652         case NETDEV_REGISTER:
 653                 mutex_init(&wdev->mtx);
 654                 INIT_LIST_HEAD(&wdev->event_list);
 655                 spin_lock_init(&wdev->event_lock);
 656                 mutex_lock(&rdev->devlist_mtx);
 657                 list_add(&wdev->list, &rdev->netdev_list);
 658                 /* can only change netns with wiphy */
 659                 dev->features |= NETIF_F_NETNS_LOCAL;
 660
 661                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 662                                       "phy80211")) {
 663                         printk(KERN_ERR "wireless: failed to add phy80211 "
 664                                 "symlink to netdev!\n");
 665                 }
 666                 wdev->netdev = dev;
 667                 wdev->sme_state = CFG80211_SME_IDLE;
 668                 mutex_unlock(&rdev->devlist_mtx);
 669 #ifdef CONFIG_WIRELESS_EXT
 670                 if (!dev->wireless_handlers)
 671                         dev->wireless_handlers = &cfg80211_wext_handler;
 672                 wdev->wext.default_key = -1;
 673                 wdev->wext.default_mgmt_key = -1;
 674                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 675                 wdev->wext.ps = CONFIG_CFG80211_DEFAULT_PS_VALUE;
 676                 wdev->wext.ps_timeout = 500;
 677                 if (rdev->ops->set_power_mgmt)
 678                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
 679                                                       wdev->wext.ps,
 680                                                       wdev->wext.ps_timeout)) {
 681                                 /* assume this means it's off */
 682                                 wdev->wext.ps = false;
 683                         }
 684 #endif
 685                 break;
 686         case NETDEV_GOING_DOWN:
 687                 switch (wdev->iftype) {
 688                 case NL80211_IFTYPE_ADHOC:
 689                         cfg80211_leave_ibss(rdev, dev, true);
 690                         break;
 691                 case NL80211_IFTYPE_STATION:
 692                         wdev_lock(wdev);
 693 #ifdef CONFIG_WIRELESS_EXT
 694                         kfree(wdev->wext.ie);
 695                         wdev->wext.ie = NULL;
 696                         wdev->wext.ie_len = 0;
 697                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 698 #endif
 699                         __cfg80211_disconnect(rdev, dev,
 700                                               WLAN_REASON_DEAUTH_LEAVING, true);
 701                         cfg80211_mlme_down(rdev, dev);
 702                         wdev_unlock(wdev);
 703                         break;
 704                 default:
 705                         break;
 706                 }
 707                 break;
 708         case NETDEV_UP:
 709 #ifdef CONFIG_WIRELESS_EXT
 710                 cfg80211_lock_rdev(rdev);
 711                 wdev_lock(wdev);
 712                 switch (wdev->iftype) {
 713                 case NL80211_IFTYPE_ADHOC:
 714                         cfg80211_ibss_wext_join(rdev, wdev);
 715                         break;
 716                 case NL80211_IFTYPE_STATION:
 717                         cfg80211_mgd_wext_connect(rdev, wdev);
 718                         break;
 719                 default:
 720                         break;
 721                 }
 722                 wdev_unlock(wdev);
 723                 cfg80211_unlock_rdev(rdev);
 724 #endif
 725                 break;
 726         case NETDEV_UNREGISTER:
 727                 mutex_lock(&rdev->devlist_mtx);
 728                 /*
 729                  * It is possible to get NETDEV_UNREGISTER
 730                  * multiple times. To detect that, check
 731                  * that the interface is still on the list
 732                  * of registered interfaces, and only then
 733                  * remove and clean it up.
 734                  */
 735                 if (!list_empty(&wdev->list)) {
 736                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 737                         list_del_init(&wdev->list);
 738                         mutex_destroy(&wdev->mtx);
 739 #ifdef CONFIG_WIRELESS_EXT
 740                         kfree(wdev->wext.keys);
 741 #endif
 742                 }
 743                 mutex_unlock(&rdev->devlist_mtx);
 744                 break;
 745         case NETDEV_PRE_UP:
 746                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 747                         return notifier_from_errno(-EOPNOTSUPP);
 748                 if (rfkill_blocked(rdev->rfkill))
 749                         return notifier_from_errno(-ERFKILL);
 750                 break;
 751         }
 752
 753         return NOTIFY_DONE;
 754 }
 755
 756 static struct notifier_block cfg80211_netdev_notifier = {
 757         .notifier_call = cfg80211_netdev_notifier_call,
 758 };
 759
 760 static void __net_exit cfg80211_pernet_exit(struct net *net)
 761 {
 762         struct cfg80211_registered_device *rdev;
 763
 764         rtnl_lock();
 765         mutex_lock(&cfg80211_mutex);
 766         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 767                 if (net_eq(wiphy_net(&rdev->wiphy), net))
 768                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
 769         }
 770         mutex_unlock(&cfg80211_mutex);
 771         rtnl_unlock();
 772 }
 773
 774 static struct pernet_operations cfg80211_pernet_ops = {
 775         .exit = cfg80211_pernet_exit,
 776 };
 777
 778 static int __init cfg80211_init(void)
 779 {
 780         int err;
 781
 782         err = register_pernet_device(&cfg80211_pernet_ops);
 783         if (err)
 784                 goto out_fail_pernet;
 785
 786         err = wiphy_sysfs_init();
 787         if (err)
 788                 goto out_fail_sysfs;
 789
 790         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
 791         if (err)
 792                 goto out_fail_notifier;
 793
 794         err = nl80211_init();
 795         if (err)
 796                 goto out_fail_nl80211;
 797
 798         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
 799
 800         err = regulatory_init();
 801         if (err)
 802                 goto out_fail_reg;
 803
 804         return 0;
 805
 806 out_fail_reg:
 807         debugfs_remove(ieee80211_debugfs_dir);
 808 out_fail_nl80211:
 809         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 810 out_fail_notifier:
 811         wiphy_sysfs_exit();
 812 out_fail_sysfs:
 813         unregister_pernet_device(&cfg80211_pernet_ops);
 814 out_fail_pernet:
 815         return err;
 816 }
 817 subsys_initcall(cfg80211_init);
 818
 819 static void cfg80211_exit(void)
 820 {
 821         debugfs_remove(ieee80211_debugfs_dir);
 822         nl80211_exit();
 823         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 824         wiphy_sysfs_exit();
 825         regulatory_exit();
 826         unregister_pernet_device(&cfg80211_pernet_ops);
 827 }
 828 module_exit(cfg80211_exit);