net/wireless/core.c

   1 /*
   2  * This is the linux wireless configuration interface.
   3  *
   4  * Copyright 2006-2010          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/slab.h>
  12 #include <linux/nl80211.h>
  13 #include <linux/debugfs.h>
  14 #include <linux/notifier.h>
  15 #include <linux/device.h>
  16 #include <linux/etherdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <linux/sched.h>
  19 #include <net/genetlink.h>
  20 #include <net/cfg80211.h>
  21 #include "nl80211.h"
  22 #include "core.h"
  23 #include "sysfs.h"
  24 #include "debugfs.h"
  25 #include "wext-compat.h"
  26 #include "ethtool.h"
  27
  28 /* name for sysfs, %d is appended */
  29 #define PHY_NAME "phy"
  30
  31 MODULE_AUTHOR("Johannes Berg");
  32 MODULE_LICENSE("GPL");
  33 MODULE_DESCRIPTION("wireless configuration support");
  34
  35 /* RCU-protected (and cfg80211_mutex for writers) */
  36 LIST_HEAD(cfg80211_rdev_list);
  37 int cfg80211_rdev_list_generation;
  38
  39 DEFINE_MUTEX(cfg80211_mutex);
  40
  41 /* for debugfs */
  42 static struct dentry *ieee80211_debugfs_dir;
  43
  44 /* for the cleanup, scan and event works */
  45 struct workqueue_struct *cfg80211_wq;
  46
  47 /* requires cfg80211_mutex to be held! */
  48 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  49 {
  50         struct cfg80211_registered_device *result = NULL, *rdev;
  51
  52         if (!wiphy_idx_valid(wiphy_idx))
  53                 return NULL;
  54
  55         assert_cfg80211_lock();
  56
  57         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  58                 if (rdev->wiphy_idx == wiphy_idx) {
  59                         result = rdev;
  60                         break;
  61                 }
  62         }
  63
  64         return result;
  65 }
  66
  67 int get_wiphy_idx(struct wiphy *wiphy)
  68 {
  69         struct cfg80211_registered_device *rdev;
  70         if (!wiphy)
  71                 return WIPHY_IDX_STALE;
  72         rdev = wiphy_to_dev(wiphy);
  73         return rdev->wiphy_idx;
  74 }
  75
  76 /* requires cfg80211_rdev_mutex to be held! */
  77 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  78 {
  79         struct cfg80211_registered_device *rdev;
  80
  81         if (!wiphy_idx_valid(wiphy_idx))
  82                 return NULL;
  83
  84         assert_cfg80211_lock();
  85
  86         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  87         if (!rdev)
  88                 return NULL;
  89         return &rdev->wiphy;
  90 }
  91
  92 /* requires cfg80211_mutex to be held! */
  93 struct cfg80211_registered_device *
  94 __cfg80211_rdev_from_info(struct genl_info *info)
  95 {
  96         int ifindex;
  97         struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
  98         struct net_device *dev;
  99         int err = -EINVAL;
 100
 101         assert_cfg80211_lock();
 102
 103         if (info->attrs[NL80211_ATTR_WIPHY]) {
 104                 bywiphyidx = cfg80211_rdev_by_wiphy_idx(
 105                                 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
 106                 err = -ENODEV;
 107         }
 108
 109         if (info->attrs[NL80211_ATTR_IFINDEX]) {
 110                 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
 111                 dev = dev_get_by_index(genl_info_net(info), ifindex);
 112                 if (dev) {
 113                         if (dev->ieee80211_ptr)
 114                                 byifidx =
 115                                         wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 116                         dev_put(dev);
 117                 }
 118                 err = -ENODEV;
 119         }
 120
 121         if (bywiphyidx && byifidx) {
 122                 if (bywiphyidx != byifidx)
 123                         return ERR_PTR(-EINVAL);
 124                 else
 125                         return bywiphyidx; /* == byifidx */
 126         }
 127         if (bywiphyidx)
 128                 return bywiphyidx;
 129
 130         if (byifidx)
 131                 return byifidx;
 132
 133         return ERR_PTR(err);
 134 }
 135
 136 struct cfg80211_registered_device *
 137 cfg80211_get_dev_from_info(struct genl_info *info)
 138 {
 139         struct cfg80211_registered_device *rdev;
 140
 141         mutex_lock(&cfg80211_mutex);
 142         rdev = __cfg80211_rdev_from_info(info);
 143
 144         /* if it is not an error we grab the lock on
 145          * it to assure it won't be going away while
 146          * we operate on it */
 147         if (!IS_ERR(rdev))
 148                 mutex_lock(&rdev->mtx);
 149
 150         mutex_unlock(&cfg80211_mutex);
 151
 152         return rdev;
 153 }
 154
 155 struct cfg80211_registered_device *
 156 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
 157 {
 158         struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
 159         struct net_device *dev;
 160
 161         mutex_lock(&cfg80211_mutex);
 162         dev = dev_get_by_index(net, ifindex);
 163         if (!dev)
 164                 goto out;
 165         if (dev->ieee80211_ptr) {
 166                 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 167                 mutex_lock(&rdev->mtx);
 168         } else
 169                 rdev = ERR_PTR(-ENODEV);
 170         dev_put(dev);
 171  out:
 172         mutex_unlock(&cfg80211_mutex);
 173         return rdev;
 174 }
 175
 176 /* requires cfg80211_mutex to be held */
 177 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 178                         char *newname)
 179 {
 180         struct cfg80211_registered_device *rdev2;
 181         int wiphy_idx, taken = -1, result, digits;
 182
 183         assert_cfg80211_lock();
 184
 185         /* prohibit calling the thing phy%d when %d is not its number */
 186         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 187         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 188                 /* count number of places needed to print wiphy_idx */
 189                 digits = 1;
 190                 while (wiphy_idx /= 10)
 191                         digits++;
 192                 /*
 193                  * deny the name if it is phy<idx> where <idx> is printed
 194                  * without leading zeroes. taken == strlen(newname) here
 195                  */
 196                 if (taken == strlen(PHY_NAME) + digits)
 197                         return -EINVAL;
 198         }
 199
 200
 201         /* Ignore nop renames */
 202         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
 203                 return 0;
 204
 205         /* Ensure another device does not already have this name. */
 206         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 207                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
 208                         return -EINVAL;
 209
 210         result = device_rename(&rdev->wiphy.dev, newname);
 211         if (result)
 212                 return result;
 213
 214         if (rdev->wiphy.debugfsdir &&
 215             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 216                             rdev->wiphy.debugfsdir,
 217                             rdev->wiphy.debugfsdir->d_parent,
 218                             newname))
 219                 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
 220                        newname);
 221
 222         nl80211_notify_dev_rename(rdev);
 223
 224         return 0;
 225 }
 226
 227 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 228                           struct net *net)
 229 {
 230         struct wireless_dev *wdev;
 231         int err = 0;
 232
 233         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 234                 return -EOPNOTSUPP;
 235
 236         list_for_each_entry(wdev, &rdev->netdev_list, list) {
 237                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 238                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 239                 if (err)
 240                         break;
 241                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 242         }
 243
 244         if (err) {
 245                 /* failed -- clean up to old netns */
 246                 net = wiphy_net(&rdev->wiphy);
 247
 248                 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
 249                                                      list) {
 250                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 251                         err = dev_change_net_namespace(wdev->netdev, net,
 252                                                         "wlan%d");
 253                         WARN_ON(err);
 254                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 255                 }
 256
 257                 return err;
 258         }
 259
 260         wiphy_net_set(&rdev->wiphy, net);
 261
 262         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 263         WARN_ON(err);
 264
 265         return 0;
 266 }
 267
 268 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 269 {
 270         struct cfg80211_registered_device *rdev = data;
 271
 272         rdev->ops->rfkill_poll(&rdev->wiphy);
 273 }
 274
 275 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 276 {
 277         struct cfg80211_registered_device *rdev = data;
 278         struct wireless_dev *wdev;
 279
 280         if (!blocked)
 281                 return 0;
 282
 283         rtnl_lock();
 284         mutex_lock(&rdev->devlist_mtx);
 285
 286         list_for_each_entry(wdev, &rdev->netdev_list, list)
 287                 dev_close(wdev->netdev);
 288
 289         mutex_unlock(&rdev->devlist_mtx);
 290         rtnl_unlock();
 291
 292         return 0;
 293 }
 294
 295 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 296 {
 297         struct cfg80211_registered_device *rdev;
 298
 299         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 300         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 301 }
 302
 303 static void cfg80211_event_work(struct work_struct *work)
 304 {
 305         struct cfg80211_registered_device *rdev;
 306
 307         rdev = container_of(work, struct cfg80211_registered_device,
 308                             event_work);
 309
 310         rtnl_lock();
 311         cfg80211_lock_rdev(rdev);
 312
 313         cfg80211_process_rdev_events(rdev);
 314         cfg80211_unlock_rdev(rdev);
 315         rtnl_unlock();
 316 }
 317
 318 /* exported functions */
 319
 320 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 321 {
 322         static int wiphy_counter;
 323
 324         struct cfg80211_registered_device *rdev;
 325         int alloc_size;
 326
 327         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 328         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 329         WARN_ON(ops->connect && !ops->disconnect);
 330         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 331         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 332         WARN_ON(ops->add_station && !ops->del_station);
 333         WARN_ON(ops->add_mpath && !ops->del_mpath);
 334
 335         alloc_size = sizeof(*rdev) + sizeof_priv;
 336
 337         rdev = kzalloc(alloc_size, GFP_KERNEL);
 338         if (!rdev)
 339                 return NULL;
 340
 341         rdev->ops = ops;
 342
 343         mutex_lock(&cfg80211_mutex);
 344
 345         rdev->wiphy_idx = wiphy_counter++;
 346
 347         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
 348                 wiphy_counter--;
 349                 mutex_unlock(&cfg80211_mutex);
 350                 /* ugh, wrapped! */
 351                 kfree(rdev);
 352                 return NULL;
 353         }
 354
 355         mutex_unlock(&cfg80211_mutex);
 356
 357         /* give it a proper name */
 358         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 359
 360         mutex_init(&rdev->mtx);
 361         mutex_init(&rdev->devlist_mtx);
 362         INIT_LIST_HEAD(&rdev->netdev_list);
 363         spin_lock_init(&rdev->bss_lock);
 364         INIT_LIST_HEAD(&rdev->bss_list);
 365         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 366
 367 #ifdef CONFIG_CFG80211_WEXT
 368         rdev->wiphy.wext = &cfg80211_wext_handler;
 369 #endif
 370
 371         device_initialize(&rdev->wiphy.dev);
 372         rdev->wiphy.dev.class = &ieee80211_class;
 373         rdev->wiphy.dev.platform_data = rdev;
 374
 375 #ifdef CONFIG_CFG80211_DEFAULT_PS
 376         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 377 #endif
 378
 379         wiphy_net_set(&rdev->wiphy, &init_net);
 380
 381         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 382         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 383                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 384                                    &rdev->rfkill_ops, rdev);
 385
 386         if (!rdev->rfkill) {
 387                 kfree(rdev);
 388                 return NULL;
 389         }
 390
 391         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 392         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 393         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 394
 395         init_waitqueue_head(&rdev->dev_wait);
 396
 397         /*
 398          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 399          * Fragmentation and RTS threshold are disabled by default with the
 400          * special -1 value.
 401          */
 402         rdev->wiphy.retry_short = 7;
 403         rdev->wiphy.retry_long = 4;
 404         rdev->wiphy.frag_threshold = (u32) -1;
 405         rdev->wiphy.rts_threshold = (u32) -1;
 406         rdev->wiphy.coverage_class = 0;
 407
 408         return &rdev->wiphy;
 409 }
 410 EXPORT_SYMBOL(wiphy_new);
 411
 412 int wiphy_register(struct wiphy *wiphy)
 413 {
 414         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 415         int res;
 416         enum ieee80211_band band;
 417         struct ieee80211_supported_band *sband;
 418         bool have_band = false;
 419         int i;
 420         u16 ifmodes = wiphy->interface_modes;
 421
 422         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 423                 return -EINVAL;
 424
 425         if (WARN_ON(wiphy->addresses &&
 426                     !is_zero_ether_addr(wiphy->perm_addr) &&
 427                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 428                            ETH_ALEN)))
 429                 return -EINVAL;
 430
 431         if (wiphy->addresses)
 432                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 433
 434         /* sanity check ifmodes */
 435         WARN_ON(!ifmodes);
 436         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 437         if (WARN_ON(ifmodes != wiphy->interface_modes))
 438                 wiphy->interface_modes = ifmodes;
 439
 440         /* sanity check supported bands/channels */
 441         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 442                 sband = wiphy->bands[band];
 443                 if (!sband)
 444                         continue;
 445
 446                 sband->band = band;
 447
 448                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
 449                         return -EINVAL;
 450
 451                 /*
 452                  * Since we use a u32 for rate bitmaps in
 453                  * ieee80211_get_response_rate, we cannot
 454                  * have more than 32 legacy rates.
 455                  */
 456                 if (WARN_ON(sband->n_bitrates > 32))
 457                         return -EINVAL;
 458
 459                 for (i = 0; i < sband->n_channels; i++) {
 460                         sband->channels[i].orig_flags =
 461                                 sband->channels[i].flags;
 462                         sband->channels[i].orig_mag =
 463                                 sband->channels[i].max_antenna_gain;
 464                         sband->channels[i].orig_mpwr =
 465                                 sband->channels[i].max_power;
 466                         sband->channels[i].band = band;
 467                 }
 468
 469                 have_band = true;
 470         }
 471
 472         if (!have_band) {
 473                 WARN_ON(1);
 474                 return -EINVAL;
 475         }
 476
 477         /* check and set up bitrates */
 478         ieee80211_set_bitrate_flags(wiphy);
 479
 480         mutex_lock(&cfg80211_mutex);
 481
 482         res = device_add(&rdev->wiphy.dev);
 483         if (res) {
 484                 mutex_unlock(&cfg80211_mutex);
 485                 return res;
 486         }
 487
 488         /* set up regulatory info */
 489         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
 490
 491         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 492         cfg80211_rdev_list_generation++;
 493
 494         /* add to debugfs */
 495         rdev->wiphy.debugfsdir =
 496                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 497                                    ieee80211_debugfs_dir);
 498         if (IS_ERR(rdev->wiphy.debugfsdir))
 499                 rdev->wiphy.debugfsdir = NULL;
 500
 501         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
 502                 struct regulatory_request request;
 503
 504                 request.wiphy_idx = get_wiphy_idx(wiphy);
 505                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 506                 request.alpha2[0] = '9';
 507                 request.alpha2[1] = '9';
 508
 509                 nl80211_send_reg_change_event(&request);
 510         }
 511
 512         cfg80211_debugfs_rdev_add(rdev);
 513         mutex_unlock(&cfg80211_mutex);
 514
 515         /*
 516          * due to a locking dependency this has to be outside of the
 517          * cfg80211_mutex lock
 518          */
 519         res = rfkill_register(rdev->rfkill);
 520         if (res)
 521                 goto out_rm_dev;
 522
 523         return 0;
 524
 525 out_rm_dev:
 526         device_del(&rdev->wiphy.dev);
 527         return res;
 528 }
 529 EXPORT_SYMBOL(wiphy_register);
 530
 531 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 532 {
 533         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 534
 535         if (!rdev->ops->rfkill_poll)
 536                 return;
 537         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 538         rfkill_resume_polling(rdev->rfkill);
 539 }
 540 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 541
 542 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 543 {
 544         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 545
 546         rfkill_pause_polling(rdev->rfkill);
 547 }
 548 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 549
 550 void wiphy_unregister(struct wiphy *wiphy)
 551 {
 552         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 553
 554         rfkill_unregister(rdev->rfkill);
 555
 556         /* protect the device list */
 557         mutex_lock(&cfg80211_mutex);
 558
 559         wait_event(rdev->dev_wait, ({
 560                 int __count;
 561                 mutex_lock(&rdev->devlist_mtx);
 562                 __count = rdev->opencount;
 563                 mutex_unlock(&rdev->devlist_mtx);
 564                 __count == 0;}));
 565
 566         mutex_lock(&rdev->devlist_mtx);
 567         BUG_ON(!list_empty(&rdev->netdev_list));
 568         mutex_unlock(&rdev->devlist_mtx);
 569
 570         /*
 571          * First remove the hardware from everywhere, this makes
 572          * it impossible to find from userspace.
 573          */
 574         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 575         list_del_rcu(&rdev->list);
 576         synchronize_rcu();
 577
 578         /*
 579          * Try to grab rdev->mtx. If a command is still in progress,
 580          * hopefully the driver will refuse it since it's tearing
 581          * down the device already. We wait for this command to complete
 582          * before unlinking the item from the list.
 583          * Note: as codified by the BUG_ON above we cannot get here if
 584          * a virtual interface is still present. Hence, we can only get
 585          * to lock contention here if userspace issues a command that
 586          * identified the hardware by wiphy index.
 587          */
 588         cfg80211_lock_rdev(rdev);
 589         /* nothing */
 590         cfg80211_unlock_rdev(rdev);
 591
 592         /* If this device got a regulatory hint tell core its
 593          * free to listen now to a new shiny device regulatory hint */
 594         reg_device_remove(wiphy);
 595
 596         cfg80211_rdev_list_generation++;
 597         device_del(&rdev->wiphy.dev);
 598
 599         mutex_unlock(&cfg80211_mutex);
 600
 601         flush_work(&rdev->scan_done_wk);
 602         cancel_work_sync(&rdev->conn_work);
 603         flush_work(&rdev->event_work);
 604 }
 605 EXPORT_SYMBOL(wiphy_unregister);
 606
 607 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 608 {
 609         struct cfg80211_internal_bss *scan, *tmp;
 610         rfkill_destroy(rdev->rfkill);
 611         mutex_destroy(&rdev->mtx);
 612         mutex_destroy(&rdev->devlist_mtx);
 613         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 614                 cfg80211_put_bss(&scan->pub);
 615         kfree(rdev);
 616 }
 617
 618 void wiphy_free(struct wiphy *wiphy)
 619 {
 620         put_device(&wiphy->dev);
 621 }
 622 EXPORT_SYMBOL(wiphy_free);
 623
 624 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 625 {
 626         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 627
 628         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 629                 schedule_work(&rdev->rfkill_sync);
 630 }
 631 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 632
 633 static void wdev_cleanup_work(struct work_struct *work)
 634 {
 635         struct wireless_dev *wdev;
 636         struct cfg80211_registered_device *rdev;
 637
 638         wdev = container_of(work, struct wireless_dev, cleanup_work);
 639         rdev = wiphy_to_dev(wdev->wiphy);
 640
 641         cfg80211_lock_rdev(rdev);
 642
 643         if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
 644                 rdev->scan_req->aborted = true;
 645                 ___cfg80211_scan_done(rdev, true);
 646         }
 647
 648         cfg80211_unlock_rdev(rdev);
 649
 650         mutex_lock(&rdev->devlist_mtx);
 651         rdev->opencount--;
 652         mutex_unlock(&rdev->devlist_mtx);
 653         wake_up(&rdev->dev_wait);
 654
 655         dev_put(wdev->netdev);
 656 }
 657
 658 static struct device_type wiphy_type = {
 659         .name   = "wlan",
 660 };
 661
 662 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
 663                                          unsigned long state,
 664                                          void *ndev)
 665 {
 666         struct net_device *dev = ndev;
 667         struct wireless_dev *wdev = dev->ieee80211_ptr;
 668         struct cfg80211_registered_device *rdev;
 669
 670         if (!wdev)
 671                 return NOTIFY_DONE;
 672
 673         rdev = wiphy_to_dev(wdev->wiphy);
 674
 675         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 676
 677         switch (state) {
 678         case NETDEV_POST_INIT:
 679                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 680                 break;
 681         case NETDEV_REGISTER:
 682                 /*
 683                  * NB: cannot take rdev->mtx here because this may be
 684                  * called within code protected by it when interfaces
 685                  * are added with nl80211.
 686                  */
 687                 mutex_init(&wdev->mtx);
 688                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
 689                 INIT_LIST_HEAD(&wdev->event_list);
 690                 spin_lock_init(&wdev->event_lock);
 691                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
 692                 spin_lock_init(&wdev->mgmt_registrations_lock);
 693
 694                 mutex_lock(&rdev->devlist_mtx);
 695                 list_add_rcu(&wdev->list, &rdev->netdev_list);
 696                 rdev->devlist_generation++;
 697                 /* can only change netns with wiphy */
 698                 dev->features |= NETIF_F_NETNS_LOCAL;
 699
 700                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 701                                       "phy80211")) {
 702                         printk(KERN_ERR "wireless: failed to add phy80211 "
 703                                 "symlink to netdev!\n");
 704                 }
 705                 wdev->netdev = dev;
 706                 wdev->sme_state = CFG80211_SME_IDLE;
 707                 mutex_unlock(&rdev->devlist_mtx);
 708 #ifdef CONFIG_CFG80211_WEXT
 709                 wdev->wext.default_key = -1;
 710                 wdev->wext.default_mgmt_key = -1;
 711                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 712 #endif
 713
 714                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
 715                         wdev->ps = true;
 716                 else
 717                         wdev->ps = false;
 718                 /* allow mac80211 to determine the timeout */
 719                 wdev->ps_timeout = -1;
 720                 if (rdev->ops->set_power_mgmt)
 721                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
 722                                                       wdev->ps,
 723                                                       wdev->ps_timeout)) {
 724                                 /* assume this means it's off */
 725                                 wdev->ps = false;
 726                         }
 727
 728                 if (!dev->ethtool_ops)
 729                         dev->ethtool_ops = &cfg80211_ethtool_ops;
 730
 731                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 732                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
 733                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
 734                         dev->priv_flags |= IFF_DONT_BRIDGE;
 735                 break;
 736         case NETDEV_GOING_DOWN:
 737                 switch (wdev->iftype) {
 738                 case NL80211_IFTYPE_ADHOC:
 739                         cfg80211_leave_ibss(rdev, dev, true);
 740                         break;
 741                 case NL80211_IFTYPE_P2P_CLIENT:
 742                 case NL80211_IFTYPE_STATION:
 743                         wdev_lock(wdev);
 744 #ifdef CONFIG_CFG80211_WEXT
 745                         kfree(wdev->wext.ie);
 746                         wdev->wext.ie = NULL;
 747                         wdev->wext.ie_len = 0;
 748                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 749 #endif
 750                         __cfg80211_disconnect(rdev, dev,
 751                                               WLAN_REASON_DEAUTH_LEAVING, true);
 752                         cfg80211_mlme_down(rdev, dev);
 753                         wdev_unlock(wdev);
 754                         break;
 755                 default:
 756                         break;
 757                 }
 758                 break;
 759         case NETDEV_DOWN:
 760                 dev_hold(dev);
 761                 queue_work(cfg80211_wq, &wdev->cleanup_work);
 762                 break;
 763         case NETDEV_UP:
 764                 /*
 765                  * If we have a really quick DOWN/UP succession we may
 766                  * have this work still pending ... cancel it and see
 767                  * if it was pending, in which case we need to account
 768                  * for some of the work it would have done.
 769                  */
 770                 if (cancel_work_sync(&wdev->cleanup_work)) {
 771                         mutex_lock(&rdev->devlist_mtx);
 772                         rdev->opencount--;
 773                         mutex_unlock(&rdev->devlist_mtx);
 774                         dev_put(dev);
 775                 }
 776                 cfg80211_lock_rdev(rdev);
 777                 mutex_lock(&rdev->devlist_mtx);
 778 #ifdef CONFIG_CFG80211_WEXT
 779                 wdev_lock(wdev);
 780                 switch (wdev->iftype) {
 781                 case NL80211_IFTYPE_ADHOC:
 782                         cfg80211_ibss_wext_join(rdev, wdev);
 783                         break;
 784                 case NL80211_IFTYPE_STATION:
 785                         cfg80211_mgd_wext_connect(rdev, wdev);
 786                         break;
 787                 default:
 788                         break;
 789                 }
 790                 wdev_unlock(wdev);
 791 #endif
 792                 rdev->opencount++;
 793                 mutex_unlock(&rdev->devlist_mtx);
 794                 cfg80211_unlock_rdev(rdev);
 795                 break;
 796         case NETDEV_UNREGISTER:
 797                 /*
 798                  * NB: cannot take rdev->mtx here because this may be
 799                  * called within code protected by it when interfaces
 800                  * are removed with nl80211.
 801                  */
 802                 mutex_lock(&rdev->devlist_mtx);
 803                 /*
 804                  * It is possible to get NETDEV_UNREGISTER
 805                  * multiple times. To detect that, check
 806                  * that the interface is still on the list
 807                  * of registered interfaces, and only then
 808                  * remove and clean it up.
 809                  */
 810                 if (!list_empty(&wdev->list)) {
 811                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 812                         list_del_rcu(&wdev->list);
 813                         rdev->devlist_generation++;
 814                         cfg80211_mlme_purge_registrations(wdev);
 815 #ifdef CONFIG_CFG80211_WEXT
 816                         kfree(wdev->wext.keys);
 817 #endif
 818                 }
 819                 mutex_unlock(&rdev->devlist_mtx);
 820                 /*
 821                  * synchronise (so that we won't find this netdev
 822                  * from other code any more) and then clear the list
 823                  * head so that the above code can safely check for
 824                  * !list_empty() to avoid double-cleanup.
 825                  */
 826                 synchronize_rcu();
 827                 INIT_LIST_HEAD(&wdev->list);
 828                 break;
 829         case NETDEV_PRE_UP:
 830                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 831                         return notifier_from_errno(-EOPNOTSUPP);
 832                 if (rfkill_blocked(rdev->rfkill))
 833                         return notifier_from_errno(-ERFKILL);
 834                 break;
 835         }
 836
 837         return NOTIFY_DONE;
 838 }
 839
 840 static struct notifier_block cfg80211_netdev_notifier = {
 841         .notifier_call = cfg80211_netdev_notifier_call,
 842 };
 843
 844 static void __net_exit cfg80211_pernet_exit(struct net *net)
 845 {
 846         struct cfg80211_registered_device *rdev;
 847
 848         rtnl_lock();
 849         mutex_lock(&cfg80211_mutex);
 850         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 851                 if (net_eq(wiphy_net(&rdev->wiphy), net))
 852                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
 853         }
 854         mutex_unlock(&cfg80211_mutex);
 855         rtnl_unlock();
 856 }
 857
 858 static struct pernet_operations cfg80211_pernet_ops = {
 859         .exit = cfg80211_pernet_exit,
 860 };
 861
 862 static int __init cfg80211_init(void)
 863 {
 864         int err;
 865
 866         err = register_pernet_device(&cfg80211_pernet_ops);
 867         if (err)
 868                 goto out_fail_pernet;
 869
 870         err = wiphy_sysfs_init();
 871         if (err)
 872                 goto out_fail_sysfs;
 873
 874         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
 875         if (err)
 876                 goto out_fail_notifier;
 877
 878         err = nl80211_init();
 879         if (err)
 880                 goto out_fail_nl80211;
 881
 882         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
 883
 884         err = regulatory_init();
 885         if (err)
 886                 goto out_fail_reg;
 887
 888         cfg80211_wq = create_singlethread_workqueue("cfg80211");
 889         if (!cfg80211_wq)
 890                 goto out_fail_wq;
 891
 892         return 0;
 893
 894 out_fail_wq:
 895         regulatory_exit();
 896 out_fail_reg:
 897         debugfs_remove(ieee80211_debugfs_dir);
 898 out_fail_nl80211:
 899         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 900 out_fail_notifier:
 901         wiphy_sysfs_exit();
 902 out_fail_sysfs:
 903         unregister_pernet_device(&cfg80211_pernet_ops);
 904 out_fail_pernet:
 905         return err;
 906 }
 907 subsys_initcall(cfg80211_init);
 908
 909 static void __exit cfg80211_exit(void)
 910 {
 911         debugfs_remove(ieee80211_debugfs_dir);
 912         nl80211_exit();
 913         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 914         wiphy_sysfs_exit();
 915         regulatory_exit();
 916         unregister_pernet_device(&cfg80211_pernet_ops);
 917         destroy_workqueue(cfg80211_wq);
 918 }
 919 module_exit(cfg80211_exit);