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 2006-2010          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/nl80211.h>
  12 #include <linux/debugfs.h>
  13 #include <linux/notifier.h>
  14 #include <linux/device.h>
  15 #include <linux/etherdevice.h>
  16 #include <linux/rtnetlink.h>
  17 #include <linux/sched.h>
  18 #include <net/genetlink.h>
  19 #include <net/cfg80211.h>
  20 #include "nl80211.h"
  21 #include "core.h"
  22 #include "sysfs.h"
  23 #include "debugfs.h"
  24 #include "wext-compat.h"
  25 #include "ethtool.h"
  26
  27 /* name for sysfs, %d is appended */
  28 #define PHY_NAME "phy"
  29
  30 MODULE_AUTHOR("Johannes Berg");
  31 MODULE_LICENSE("GPL");
  32 MODULE_DESCRIPTION("wireless configuration support");
  33
  34 /* RCU-protected (and cfg80211_mutex for writers) */
  35 LIST_HEAD(cfg80211_rdev_list);
  36 int cfg80211_rdev_list_generation;
  37
  38 DEFINE_MUTEX(cfg80211_mutex);
  39
  40 /* for debugfs */
  41 static struct dentry *ieee80211_debugfs_dir;
  42
  43 /* for the cleanup, scan and event works */
  44 struct workqueue_struct *cfg80211_wq;
  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.flags & WIPHY_FLAG_NETNS_OK))
 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_event_work(struct work_struct *work)
 298 {
 299         struct cfg80211_registered_device *rdev;
 300
 301         rdev = container_of(work, struct cfg80211_registered_device,
 302                             event_work);
 303
 304         rtnl_lock();
 305         cfg80211_lock_rdev(rdev);
 306
 307         cfg80211_process_rdev_events(rdev);
 308         cfg80211_unlock_rdev(rdev);
 309         rtnl_unlock();
 310 }
 311
 312 /* exported functions */
 313
 314 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 315 {
 316         static int wiphy_counter;
 317
 318         struct cfg80211_registered_device *rdev;
 319         int alloc_size;
 320
 321         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 322         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 323         WARN_ON(ops->connect && !ops->disconnect);
 324         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 325         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 326         WARN_ON(ops->add_station && !ops->del_station);
 327         WARN_ON(ops->add_mpath && !ops->del_mpath);
 328
 329         alloc_size = sizeof(*rdev) + sizeof_priv;
 330
 331         rdev = kzalloc(alloc_size, GFP_KERNEL);
 332         if (!rdev)
 333                 return NULL;
 334
 335         rdev->ops = ops;
 336
 337         mutex_lock(&cfg80211_mutex);
 338
 339         rdev->wiphy_idx = wiphy_counter++;
 340
 341         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
 342                 wiphy_counter--;
 343                 mutex_unlock(&cfg80211_mutex);
 344                 /* ugh, wrapped! */
 345                 kfree(rdev);
 346                 return NULL;
 347         }
 348
 349         mutex_unlock(&cfg80211_mutex);
 350
 351         /* give it a proper name */
 352         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 353
 354         mutex_init(&rdev->mtx);
 355         mutex_init(&rdev->devlist_mtx);
 356         INIT_LIST_HEAD(&rdev->netdev_list);
 357         spin_lock_init(&rdev->bss_lock);
 358         INIT_LIST_HEAD(&rdev->bss_list);
 359         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 360
 361 #ifdef CONFIG_CFG80211_WEXT
 362         rdev->wiphy.wext = &cfg80211_wext_handler;
 363 #endif
 364
 365         device_initialize(&rdev->wiphy.dev);
 366         rdev->wiphy.dev.class = &ieee80211_class;
 367         rdev->wiphy.dev.platform_data = rdev;
 368
 369 #ifdef CONFIG_CFG80211_DEFAULT_PS
 370         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 371 #endif
 372
 373         wiphy_net_set(&rdev->wiphy, &init_net);
 374
 375         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 376         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 377                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 378                                    &rdev->rfkill_ops, rdev);
 379
 380         if (!rdev->rfkill) {
 381                 kfree(rdev);
 382                 return NULL;
 383         }
 384
 385         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 386         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 387         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 388
 389         init_waitqueue_head(&rdev->dev_wait);
 390
 391         /*
 392          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 393          * Fragmentation and RTS threshold are disabled by default with the
 394          * special -1 value.
 395          */
 396         rdev->wiphy.retry_short = 7;
 397         rdev->wiphy.retry_long = 4;
 398         rdev->wiphy.frag_threshold = (u32) -1;
 399         rdev->wiphy.rts_threshold = (u32) -1;
 400         rdev->wiphy.coverage_class = 0;
 401
 402         return &rdev->wiphy;
 403 }
 404 EXPORT_SYMBOL(wiphy_new);
 405
 406 int wiphy_register(struct wiphy *wiphy)
 407 {
 408         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 409         int res;
 410         enum ieee80211_band band;
 411         struct ieee80211_supported_band *sband;
 412         bool have_band = false;
 413         int i;
 414         u16 ifmodes = wiphy->interface_modes;
 415
 416         /* sanity check ifmodes */
 417         WARN_ON(!ifmodes);
 418         ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
 419         if (WARN_ON(ifmodes != wiphy->interface_modes))
 420                 wiphy->interface_modes = ifmodes;
 421
 422         /* sanity check supported bands/channels */
 423         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 424                 sband = wiphy->bands[band];
 425                 if (!sband)
 426                         continue;
 427
 428                 sband->band = band;
 429
 430                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
 431                         return -EINVAL;
 432
 433                 /*
 434                  * Since we use a u32 for rate bitmaps in
 435                  * ieee80211_get_response_rate, we cannot
 436                  * have more than 32 legacy rates.
 437                  */
 438                 if (WARN_ON(sband->n_bitrates > 32))
 439                         return -EINVAL;
 440
 441                 for (i = 0; i < sband->n_channels; i++) {
 442                         sband->channels[i].orig_flags =
 443                                 sband->channels[i].flags;
 444                         sband->channels[i].orig_mag =
 445                                 sband->channels[i].max_antenna_gain;
 446                         sband->channels[i].orig_mpwr =
 447                                 sband->channels[i].max_power;
 448                         sband->channels[i].band = band;
 449                 }
 450
 451                 have_band = true;
 452         }
 453
 454         if (!have_band) {
 455                 WARN_ON(1);
 456                 return -EINVAL;
 457         }
 458
 459         /* check and set up bitrates */
 460         ieee80211_set_bitrate_flags(wiphy);
 461
 462         res = device_add(&rdev->wiphy.dev);
 463         if (res)
 464                 return res;
 465
 466         res = rfkill_register(rdev->rfkill);
 467         if (res)
 468                 goto out_rm_dev;
 469
 470         mutex_lock(&cfg80211_mutex);
 471
 472         /* set up regulatory info */
 473         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
 474
 475         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 476         cfg80211_rdev_list_generation++;
 477
 478         mutex_unlock(&cfg80211_mutex);
 479
 480         /* add to debugfs */
 481         rdev->wiphy.debugfsdir =
 482                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 483                                    ieee80211_debugfs_dir);
 484         if (IS_ERR(rdev->wiphy.debugfsdir))
 485                 rdev->wiphy.debugfsdir = NULL;
 486
 487         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
 488                 struct regulatory_request request;
 489
 490                 request.wiphy_idx = get_wiphy_idx(wiphy);
 491                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 492                 request.alpha2[0] = '9';
 493                 request.alpha2[1] = '9';
 494
 495                 nl80211_send_reg_change_event(&request);
 496         }
 497
 498         cfg80211_debugfs_rdev_add(rdev);
 499
 500         return 0;
 501
 502  out_rm_dev:
 503         device_del(&rdev->wiphy.dev);
 504         return res;
 505 }
 506 EXPORT_SYMBOL(wiphy_register);
 507
 508 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 509 {
 510         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 511
 512         if (!rdev->ops->rfkill_poll)
 513                 return;
 514         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 515         rfkill_resume_polling(rdev->rfkill);
 516 }
 517 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 518
 519 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 520 {
 521         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 522
 523         rfkill_pause_polling(rdev->rfkill);
 524 }
 525 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 526
 527 void wiphy_unregister(struct wiphy *wiphy)
 528 {
 529         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 530
 531         rfkill_unregister(rdev->rfkill);
 532
 533         /* protect the device list */
 534         mutex_lock(&cfg80211_mutex);
 535
 536         wait_event(rdev->dev_wait, ({
 537                 int __count;
 538                 mutex_lock(&rdev->devlist_mtx);
 539                 __count = rdev->opencount;
 540                 mutex_unlock(&rdev->devlist_mtx);
 541                 __count == 0;}));
 542
 543         mutex_lock(&rdev->devlist_mtx);
 544         BUG_ON(!list_empty(&rdev->netdev_list));
 545         mutex_unlock(&rdev->devlist_mtx);
 546
 547         /*
 548          * First remove the hardware from everywhere, this makes
 549          * it impossible to find from userspace.
 550          */
 551         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 552         list_del_rcu(&rdev->list);
 553         synchronize_rcu();
 554
 555         /*
 556          * Try to grab rdev->mtx. If a command is still in progress,
 557          * hopefully the driver will refuse it since it's tearing
 558          * down the device already. We wait for this command to complete
 559          * before unlinking the item from the list.
 560          * Note: as codified by the BUG_ON above we cannot get here if
 561          * a virtual interface is still present. Hence, we can only get
 562          * to lock contention here if userspace issues a command that
 563          * identified the hardware by wiphy index.
 564          */
 565         cfg80211_lock_rdev(rdev);
 566         /* nothing */
 567         cfg80211_unlock_rdev(rdev);
 568
 569         /* If this device got a regulatory hint tell core its
 570          * free to listen now to a new shiny device regulatory hint */
 571         reg_device_remove(wiphy);
 572
 573         cfg80211_rdev_list_generation++;
 574         device_del(&rdev->wiphy.dev);
 575
 576         mutex_unlock(&cfg80211_mutex);
 577
 578         flush_work(&rdev->scan_done_wk);
 579         cancel_work_sync(&rdev->conn_work);
 580         flush_work(&rdev->event_work);
 581 }
 582 EXPORT_SYMBOL(wiphy_unregister);
 583
 584 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 585 {
 586         struct cfg80211_internal_bss *scan, *tmp;
 587         rfkill_destroy(rdev->rfkill);
 588         mutex_destroy(&rdev->mtx);
 589         mutex_destroy(&rdev->devlist_mtx);
 590         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 591                 cfg80211_put_bss(&scan->pub);
 592         kfree(rdev);
 593 }
 594
 595 void wiphy_free(struct wiphy *wiphy)
 596 {
 597         put_device(&wiphy->dev);
 598 }
 599 EXPORT_SYMBOL(wiphy_free);
 600
 601 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 602 {
 603         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 604
 605         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 606                 schedule_work(&rdev->rfkill_sync);
 607 }
 608 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 609
 610 static void wdev_cleanup_work(struct work_struct *work)
 611 {
 612         struct wireless_dev *wdev;
 613         struct cfg80211_registered_device *rdev;
 614
 615         wdev = container_of(work, struct wireless_dev, cleanup_work);
 616         rdev = wiphy_to_dev(wdev->wiphy);
 617
 618         cfg80211_lock_rdev(rdev);
 619
 620         if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
 621                 rdev->scan_req->aborted = true;
 622                 ___cfg80211_scan_done(rdev, true);
 623         }
 624
 625         cfg80211_unlock_rdev(rdev);
 626
 627         mutex_lock(&rdev->devlist_mtx);
 628         rdev->opencount--;
 629         mutex_unlock(&rdev->devlist_mtx);
 630         wake_up(&rdev->dev_wait);
 631
 632         dev_put(wdev->netdev);
 633 }
 634
 635 static struct device_type wiphy_type = {
 636         .name   = "wlan",
 637 };
 638
 639 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
 640                                          unsigned long state,
 641                                          void *ndev)
 642 {
 643         struct net_device *dev = ndev;
 644         struct wireless_dev *wdev = dev->ieee80211_ptr;
 645         struct cfg80211_registered_device *rdev;
 646
 647         if (!wdev)
 648                 return NOTIFY_DONE;
 649
 650         rdev = wiphy_to_dev(wdev->wiphy);
 651
 652         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 653
 654         switch (state) {
 655         case NETDEV_POST_INIT:
 656                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 657                 break;
 658         case NETDEV_REGISTER:
 659                 /*
 660                  * NB: cannot take rdev->mtx here because this may be
 661                  * called within code protected by it when interfaces
 662                  * are added with nl80211.
 663                  */
 664                 mutex_init(&wdev->mtx);
 665                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
 666                 INIT_LIST_HEAD(&wdev->event_list);
 667                 spin_lock_init(&wdev->event_lock);
 668                 mutex_lock(&rdev->devlist_mtx);
 669                 list_add_rcu(&wdev->list, &rdev->netdev_list);
 670                 rdev->devlist_generation++;
 671                 /* can only change netns with wiphy */
 672                 dev->features |= NETIF_F_NETNS_LOCAL;
 673
 674                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 675                                       "phy80211")) {
 676                         printk(KERN_ERR "wireless: failed to add phy80211 "
 677                                 "symlink to netdev!\n");
 678                 }
 679                 wdev->netdev = dev;
 680                 wdev->sme_state = CFG80211_SME_IDLE;
 681                 mutex_unlock(&rdev->devlist_mtx);
 682 #ifdef CONFIG_CFG80211_WEXT
 683                 wdev->wext.default_key = -1;
 684                 wdev->wext.default_mgmt_key = -1;
 685                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 686                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
 687                         wdev->wext.ps = true;
 688                 else
 689                         wdev->wext.ps = false;
 690                 wdev->wext.ps_timeout = 100;
 691                 if (rdev->ops->set_power_mgmt)
 692                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
 693                                                       wdev->wext.ps,
 694                                                       wdev->wext.ps_timeout)) {
 695                                 /* assume this means it's off */
 696                                 wdev->wext.ps = false;
 697                         }
 698 #endif
 699                 if (!dev->ethtool_ops)
 700                         dev->ethtool_ops = &cfg80211_ethtool_ops;
 701
 702                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 703                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
 704                         dev->priv_flags |= IFF_DONT_BRIDGE;
 705                 break;
 706         case NETDEV_GOING_DOWN:
 707                 switch (wdev->iftype) {
 708                 case NL80211_IFTYPE_ADHOC:
 709                         cfg80211_leave_ibss(rdev, dev, true);
 710                         break;
 711                 case NL80211_IFTYPE_STATION:
 712                         wdev_lock(wdev);
 713 #ifdef CONFIG_CFG80211_WEXT
 714                         kfree(wdev->wext.ie);
 715                         wdev->wext.ie = NULL;
 716                         wdev->wext.ie_len = 0;
 717                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 718 #endif
 719                         __cfg80211_disconnect(rdev, dev,
 720                                               WLAN_REASON_DEAUTH_LEAVING, true);
 721                         cfg80211_mlme_down(rdev, dev);
 722                         wdev_unlock(wdev);
 723                         break;
 724                 default:
 725                         break;
 726                 }
 727                 break;
 728         case NETDEV_DOWN:
 729                 dev_hold(dev);
 730                 queue_work(cfg80211_wq, &wdev->cleanup_work);
 731                 break;
 732         case NETDEV_UP:
 733                 /*
 734                  * If we have a really quick DOWN/UP succession we may
 735                  * have this work still pending ... cancel it and see
 736                  * if it was pending, in which case we need to account
 737                  * for some of the work it would have done.
 738                  */
 739                 if (cancel_work_sync(&wdev->cleanup_work)) {
 740                         mutex_lock(&rdev->devlist_mtx);
 741                         rdev->opencount--;
 742                         mutex_unlock(&rdev->devlist_mtx);
 743                         dev_put(dev);
 744                 }
 745                 cfg80211_lock_rdev(rdev);
 746                 mutex_lock(&rdev->devlist_mtx);
 747 #ifdef CONFIG_CFG80211_WEXT
 748                 wdev_lock(wdev);
 749                 switch (wdev->iftype) {
 750                 case NL80211_IFTYPE_ADHOC:
 751                         cfg80211_ibss_wext_join(rdev, wdev);
 752                         break;
 753                 case NL80211_IFTYPE_STATION:
 754                         cfg80211_mgd_wext_connect(rdev, wdev);
 755                         break;
 756                 default:
 757                         break;
 758                 }
 759                 wdev_unlock(wdev);
 760 #endif
 761                 rdev->opencount++;
 762                 mutex_unlock(&rdev->devlist_mtx);
 763                 cfg80211_unlock_rdev(rdev);
 764                 break;
 765         case NETDEV_UNREGISTER:
 766                 /*
 767                  * NB: cannot take rdev->mtx here because this may be
 768                  * called within code protected by it when interfaces
 769                  * are removed with nl80211.
 770                  */
 771                 mutex_lock(&rdev->devlist_mtx);
 772                 /*
 773                  * It is possible to get NETDEV_UNREGISTER
 774                  * multiple times. To detect that, check
 775                  * that the interface is still on the list
 776                  * of registered interfaces, and only then
 777                  * remove and clean it up.
 778                  */
 779                 if (!list_empty(&wdev->list)) {
 780                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 781                         list_del_rcu(&wdev->list);
 782                         rdev->devlist_generation++;
 783 #ifdef CONFIG_CFG80211_WEXT
 784                         kfree(wdev->wext.keys);
 785 #endif
 786                 }
 787                 mutex_unlock(&rdev->devlist_mtx);
 788                 /*
 789                  * synchronise (so that we won't find this netdev
 790                  * from other code any more) and then clear the list
 791                  * head so that the above code can safely check for
 792                  * !list_empty() to avoid double-cleanup.
 793                  */
 794                 synchronize_rcu();
 795                 INIT_LIST_HEAD(&wdev->list);
 796                 break;
 797         case NETDEV_PRE_UP:
 798                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 799                         return notifier_from_errno(-EOPNOTSUPP);
 800                 if (rfkill_blocked(rdev->rfkill))
 801                         return notifier_from_errno(-ERFKILL);
 802                 break;
 803         }
 804
 805         return NOTIFY_DONE;
 806 }
 807
 808 static struct notifier_block cfg80211_netdev_notifier = {
 809         .notifier_call = cfg80211_netdev_notifier_call,
 810 };
 811
 812 static void __net_exit cfg80211_pernet_exit(struct net *net)
 813 {
 814         struct cfg80211_registered_device *rdev;
 815
 816         rtnl_lock();
 817         mutex_lock(&cfg80211_mutex);
 818         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 819                 if (net_eq(wiphy_net(&rdev->wiphy), net))
 820                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
 821         }
 822         mutex_unlock(&cfg80211_mutex);
 823         rtnl_unlock();
 824 }
 825
 826 static struct pernet_operations cfg80211_pernet_ops = {
 827         .exit = cfg80211_pernet_exit,
 828 };
 829
 830 static int __init cfg80211_init(void)
 831 {
 832         int err;
 833
 834         err = register_pernet_device(&cfg80211_pernet_ops);
 835         if (err)
 836                 goto out_fail_pernet;
 837
 838         err = wiphy_sysfs_init();
 839         if (err)
 840                 goto out_fail_sysfs;
 841
 842         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
 843         if (err)
 844                 goto out_fail_notifier;
 845
 846         err = nl80211_init();
 847         if (err)
 848                 goto out_fail_nl80211;
 849
 850         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
 851
 852         err = regulatory_init();
 853         if (err)
 854                 goto out_fail_reg;
 855
 856         cfg80211_wq = create_singlethread_workqueue("cfg80211");
 857         if (!cfg80211_wq)
 858                 goto out_fail_wq;
 859
 860         return 0;
 861
 862 out_fail_wq:
 863         regulatory_exit();
 864 out_fail_reg:
 865         debugfs_remove(ieee80211_debugfs_dir);
 866 out_fail_nl80211:
 867         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 868 out_fail_notifier:
 869         wiphy_sysfs_exit();
 870 out_fail_sysfs:
 871         unregister_pernet_device(&cfg80211_pernet_ops);
 872 out_fail_pernet:
 873         return err;
 874 }
 875 subsys_initcall(cfg80211_init);
 876
 877 static void cfg80211_exit(void)
 878 {
 879         debugfs_remove(ieee80211_debugfs_dir);
 880         nl80211_exit();
 881         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 882         wiphy_sysfs_exit();
 883         regulatory_exit();
 884         unregister_pernet_device(&cfg80211_pernet_ops);
 885         destroy_workqueue(cfg80211_wq);
 886 }
 887 module_exit(cfg80211_exit);