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/etherdevice.h>
  16 #include <linux/rtnetlink.h>
  17 #include <net/genetlink.h>
  18 #include <net/cfg80211.h>
  19 #include "nl80211.h"
  20 #include "core.h"
  21 #include "sysfs.h"
  22 #include "debugfs.h"
  23 #include "wext-compat.h"
  24 #include "ethtool.h"
  25
  26 /* name for sysfs, %d is appended */
  27 #define PHY_NAME "phy"
  28
  29 MODULE_AUTHOR("Johannes Berg");
  30 MODULE_LICENSE("GPL");
  31 MODULE_DESCRIPTION("wireless configuration support");
  32
  33 /* RCU might be appropriate here since we usually
  34  * only read the list, and that can happen quite
  35  * often because we need to do it for each command */
  36 LIST_HEAD(cfg80211_rdev_list);
  37 int cfg80211_rdev_list_generation;
  38
  39 /*
  40  * This is used to protect the cfg80211_rdev_list
  41  */
  42 DEFINE_MUTEX(cfg80211_mutex);
  43
  44 /* for debugfs */
  45 static struct dentry *ieee80211_debugfs_dir;
  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.netnsok)
 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
 258         wiphy_net_set(&rdev->wiphy, net);
 259
 260         return err;
 261 }
 262
 263 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 264 {
 265         struct cfg80211_registered_device *rdev = data;
 266
 267         rdev->ops->rfkill_poll(&rdev->wiphy);
 268 }
 269
 270 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 271 {
 272         struct cfg80211_registered_device *rdev = data;
 273         struct wireless_dev *wdev;
 274
 275         if (!blocked)
 276                 return 0;
 277
 278         rtnl_lock();
 279         mutex_lock(&rdev->devlist_mtx);
 280
 281         list_for_each_entry(wdev, &rdev->netdev_list, list)
 282                 dev_close(wdev->netdev);
 283
 284         mutex_unlock(&rdev->devlist_mtx);
 285         rtnl_unlock();
 286
 287         return 0;
 288 }
 289
 290 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 291 {
 292         struct cfg80211_registered_device *rdev;
 293
 294         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 295         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 296 }
 297
 298 static void cfg80211_event_work(struct work_struct *work)
 299 {
 300         struct cfg80211_registered_device *rdev;
 301
 302         rdev = container_of(work, struct cfg80211_registered_device,
 303                             event_work);
 304
 305         rtnl_lock();
 306         cfg80211_lock_rdev(rdev);
 307
 308         cfg80211_process_rdev_events(rdev);
 309         cfg80211_unlock_rdev(rdev);
 310         rtnl_unlock();
 311 }
 312
 313 /* exported functions */
 314
 315 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 316 {
 317         static int wiphy_counter;
 318
 319         struct cfg80211_registered_device *rdev;
 320         int alloc_size;
 321
 322         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 323         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 324         WARN_ON(ops->connect && !ops->disconnect);
 325         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 326         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 327         WARN_ON(ops->add_station && !ops->del_station);
 328         WARN_ON(ops->add_mpath && !ops->del_mpath);
 329
 330         alloc_size = sizeof(*rdev) + sizeof_priv;
 331
 332         rdev = kzalloc(alloc_size, GFP_KERNEL);
 333         if (!rdev)
 334                 return NULL;
 335
 336         rdev->ops = ops;
 337
 338         mutex_lock(&cfg80211_mutex);
 339
 340         rdev->wiphy_idx = wiphy_counter++;
 341
 342         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
 343                 wiphy_counter--;
 344                 mutex_unlock(&cfg80211_mutex);
 345                 /* ugh, wrapped! */
 346                 kfree(rdev);
 347                 return NULL;
 348         }
 349
 350         mutex_unlock(&cfg80211_mutex);
 351
 352         /* give it a proper name */
 353         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 354
 355         mutex_init(&rdev->mtx);
 356         mutex_init(&rdev->devlist_mtx);
 357         INIT_LIST_HEAD(&rdev->netdev_list);
 358         spin_lock_init(&rdev->bss_lock);
 359         INIT_LIST_HEAD(&rdev->bss_list);
 360         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 361
 362 #ifdef CONFIG_CFG80211_WEXT
 363         rdev->wiphy.wext = &cfg80211_wext_handler;
 364 #endif
 365
 366         device_initialize(&rdev->wiphy.dev);
 367         rdev->wiphy.dev.class = &ieee80211_class;
 368         rdev->wiphy.dev.platform_data = rdev;
 369
 370         rdev->wiphy.ps_default = CONFIG_CFG80211_DEFAULT_PS_VALUE;
 371
 372         wiphy_net_set(&rdev->wiphy, &init_net);
 373
 374         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 375         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 376                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 377                                    &rdev->rfkill_ops, rdev);
 378
 379         if (!rdev->rfkill) {
 380                 kfree(rdev);
 381                 return NULL;
 382         }
 383
 384         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 385         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 386         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 387
 388         init_waitqueue_head(&rdev->dev_wait);
 389
 390         /*
 391          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 392          * Fragmentation and RTS threshold are disabled by default with the
 393          * special -1 value.
 394          */
 395         rdev->wiphy.retry_short = 7;
 396         rdev->wiphy.retry_long = 4;
 397         rdev->wiphy.frag_threshold = (u32) -1;
 398         rdev->wiphy.rts_threshold = (u32) -1;
 399
 400         return &rdev->wiphy;
 401 }
 402 EXPORT_SYMBOL(wiphy_new);
 403
 404 int wiphy_register(struct wiphy *wiphy)
 405 {
 406         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 407         int res;
 408         enum ieee80211_band band;
 409         struct ieee80211_supported_band *sband;
 410         bool have_band = false;
 411         int i;
 412         u16 ifmodes = wiphy->interface_modes;
 413
 414         /* sanity check ifmodes */
 415         WARN_ON(!ifmodes);
 416         ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
 417         if (WARN_ON(ifmodes != wiphy->interface_modes))
 418                 wiphy->interface_modes = ifmodes;
 419
 420         /* sanity check supported bands/channels */
 421         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 422                 sband = wiphy->bands[band];
 423                 if (!sband)
 424                         continue;
 425
 426                 sband->band = band;
 427
 428                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
 429                         return -EINVAL;
 430
 431                 /*
 432                  * Since we use a u32 for rate bitmaps in
 433                  * ieee80211_get_response_rate, we cannot
 434                  * have more than 32 legacy rates.
 435                  */
 436                 if (WARN_ON(sband->n_bitrates > 32))
 437                         return -EINVAL;
 438
 439                 for (i = 0; i < sband->n_channels; i++) {
 440                         sband->channels[i].orig_flags =
 441                                 sband->channels[i].flags;
 442                         sband->channels[i].orig_mag =
 443                                 sband->channels[i].max_antenna_gain;
 444                         sband->channels[i].orig_mpwr =
 445                                 sband->channels[i].max_power;
 446                         sband->channels[i].band = band;
 447                 }
 448
 449                 have_band = true;
 450         }
 451
 452         if (!have_band) {
 453                 WARN_ON(1);
 454                 return -EINVAL;
 455         }
 456
 457         /* check and set up bitrates */
 458         ieee80211_set_bitrate_flags(wiphy);
 459
 460         res = device_add(&rdev->wiphy.dev);
 461         if (res)
 462                 return res;
 463
 464         res = rfkill_register(rdev->rfkill);
 465         if (res)
 466                 goto out_rm_dev;
 467
 468         mutex_lock(&cfg80211_mutex);
 469
 470         /* set up regulatory info */
 471         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
 472
 473         list_add(&rdev->list, &cfg80211_rdev_list);
 474         cfg80211_rdev_list_generation++;
 475
 476         mutex_unlock(&cfg80211_mutex);
 477
 478         /* add to debugfs */
 479         rdev->wiphy.debugfsdir =
 480                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 481                                    ieee80211_debugfs_dir);
 482         if (IS_ERR(rdev->wiphy.debugfsdir))
 483                 rdev->wiphy.debugfsdir = NULL;
 484
 485         if (wiphy->custom_regulatory) {
 486                 struct regulatory_request request;
 487
 488                 request.wiphy_idx = get_wiphy_idx(wiphy);
 489                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 490                 request.alpha2[0] = '9';
 491                 request.alpha2[1] = '9';
 492
 493                 nl80211_send_reg_change_event(&request);
 494         }
 495
 496         cfg80211_debugfs_rdev_add(rdev);
 497
 498         return 0;
 499
 500  out_rm_dev:
 501         device_del(&rdev->wiphy.dev);
 502         return res;
 503 }
 504 EXPORT_SYMBOL(wiphy_register);
 505
 506 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 507 {
 508         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 509
 510         if (!rdev->ops->rfkill_poll)
 511                 return;
 512         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 513         rfkill_resume_polling(rdev->rfkill);
 514 }
 515 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 516
 517 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 518 {
 519         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 520
 521         rfkill_pause_polling(rdev->rfkill);
 522 }
 523 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 524
 525 void wiphy_unregister(struct wiphy *wiphy)
 526 {
 527         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 528
 529         rfkill_unregister(rdev->rfkill);
 530
 531         /* protect the device list */
 532         mutex_lock(&cfg80211_mutex);
 533
 534         wait_event(rdev->dev_wait, ({
 535                 int __count;
 536                 mutex_lock(&rdev->devlist_mtx);
 537                 __count = rdev->opencount;
 538                 mutex_unlock(&rdev->devlist_mtx);
 539                 __count == 0;}));
 540
 541         mutex_lock(&rdev->devlist_mtx);
 542         BUG_ON(!list_empty(&rdev->netdev_list));
 543         mutex_unlock(&rdev->devlist_mtx);
 544
 545         /*
 546          * First remove the hardware from everywhere, this makes
 547          * it impossible to find from userspace.
 548          */
 549         cfg80211_debugfs_rdev_del(rdev);
 550         list_del(&rdev->list);
 551
 552         /*
 553          * Try to grab rdev->mtx. If a command is still in progress,
 554          * hopefully the driver will refuse it since it's tearing
 555          * down the device already. We wait for this command to complete
 556          * before unlinking the item from the list.
 557          * Note: as codified by the BUG_ON above we cannot get here if
 558          * a virtual interface is still present. Hence, we can only get
 559          * to lock contention here if userspace issues a command that
 560          * identified the hardware by wiphy index.
 561          */
 562         cfg80211_lock_rdev(rdev);
 563         /* nothing */
 564         cfg80211_unlock_rdev(rdev);
 565
 566         /* If this device got a regulatory hint tell core its
 567          * free to listen now to a new shiny device regulatory hint */
 568         reg_device_remove(wiphy);
 569
 570         cfg80211_rdev_list_generation++;
 571         device_del(&rdev->wiphy.dev);
 572         debugfs_remove(rdev->wiphy.debugfsdir);
 573
 574         mutex_unlock(&cfg80211_mutex);
 575
 576         flush_work(&rdev->scan_done_wk);
 577         cancel_work_sync(&rdev->conn_work);
 578         flush_work(&rdev->event_work);
 579 }
 580 EXPORT_SYMBOL(wiphy_unregister);
 581
 582 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 583 {
 584         struct cfg80211_internal_bss *scan, *tmp;
 585         rfkill_destroy(rdev->rfkill);
 586         mutex_destroy(&rdev->mtx);
 587         mutex_destroy(&rdev->devlist_mtx);
 588         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 589                 cfg80211_put_bss(&scan->pub);
 590         kfree(rdev);
 591 }
 592
 593 void wiphy_free(struct wiphy *wiphy)
 594 {
 595         put_device(&wiphy->dev);
 596 }
 597 EXPORT_SYMBOL(wiphy_free);
 598
 599 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 600 {
 601         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 602
 603         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 604                 schedule_work(&rdev->rfkill_sync);
 605 }
 606 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 607
 608 static void wdev_cleanup_work(struct work_struct *work)
 609 {
 610         struct wireless_dev *wdev;
 611         struct cfg80211_registered_device *rdev;
 612
 613         wdev = container_of(work, struct wireless_dev, cleanup_work);
 614         rdev = wiphy_to_dev(wdev->wiphy);
 615
 616         cfg80211_lock_rdev(rdev);
 617
 618         if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
 619                 rdev->scan_req->aborted = true;
 620                 ___cfg80211_scan_done(rdev, true);
 621         }
 622
 623         cfg80211_unlock_rdev(rdev);
 624
 625         mutex_lock(&rdev->devlist_mtx);
 626         rdev->opencount--;
 627         mutex_unlock(&rdev->devlist_mtx);
 628         wake_up(&rdev->dev_wait);
 629
 630         dev_put(wdev->netdev);
 631 }
 632
 633 static struct device_type wiphy_type = {
 634         .name   = "wlan",
 635 };
 636
 637 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
 638                                          unsigned long state,
 639                                          void *ndev)
 640 {
 641         struct net_device *dev = ndev;
 642         struct wireless_dev *wdev = dev->ieee80211_ptr;
 643         struct cfg80211_registered_device *rdev;
 644
 645         if (!wdev)
 646                 return NOTIFY_DONE;
 647
 648         rdev = wiphy_to_dev(wdev->wiphy);
 649
 650         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 651
 652         switch (state) {
 653         case NETDEV_POST_INIT:
 654                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 655                 break;
 656         case NETDEV_REGISTER:
 657                 /*
 658                  * NB: cannot take rdev->mtx here because this may be
 659                  * called within code protected by it when interfaces
 660                  * are added with nl80211.
 661                  */
 662                 mutex_init(&wdev->mtx);
 663                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
 664                 INIT_LIST_HEAD(&wdev->event_list);
 665                 spin_lock_init(&wdev->event_lock);
 666                 mutex_lock(&rdev->devlist_mtx);
 667                 list_add(&wdev->list, &rdev->netdev_list);
 668                 rdev->devlist_generation++;
 669                 /* can only change netns with wiphy */
 670                 dev->features |= NETIF_F_NETNS_LOCAL;
 671
 672                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 673                                       "phy80211")) {
 674                         printk(KERN_ERR "wireless: failed to add phy80211 "
 675                                 "symlink to netdev!\n");
 676                 }
 677                 wdev->netdev = dev;
 678                 wdev->sme_state = CFG80211_SME_IDLE;
 679                 mutex_unlock(&rdev->devlist_mtx);
 680 #ifdef CONFIG_CFG80211_WEXT
 681                 wdev->wext.default_key = -1;
 682                 wdev->wext.default_mgmt_key = -1;
 683                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 684                 wdev->wext.ps = wdev->wiphy->ps_default;
 685                 wdev->wext.ps_timeout = 100;
 686                 if (rdev->ops->set_power_mgmt)
 687                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
 688                                                       wdev->wext.ps,
 689                                                       wdev->wext.ps_timeout)) {
 690                                 /* assume this means it's off */
 691                                 wdev->wext.ps = false;
 692                         }
 693 #endif
 694                 if (!dev->ethtool_ops)
 695                         dev->ethtool_ops = &cfg80211_ethtool_ops;
 696                 break;
 697         case NETDEV_GOING_DOWN:
 698                 switch (wdev->iftype) {
 699                 case NL80211_IFTYPE_ADHOC:
 700                         cfg80211_leave_ibss(rdev, dev, true);
 701                         break;
 702                 case NL80211_IFTYPE_STATION:
 703                         wdev_lock(wdev);
 704 #ifdef CONFIG_CFG80211_WEXT
 705                         kfree(wdev->wext.ie);
 706                         wdev->wext.ie = NULL;
 707                         wdev->wext.ie_len = 0;
 708                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 709 #endif
 710                         __cfg80211_disconnect(rdev, dev,
 711                                               WLAN_REASON_DEAUTH_LEAVING, true);
 712                         cfg80211_mlme_down(rdev, dev);
 713                         wdev_unlock(wdev);
 714                         break;
 715                 default:
 716                         break;
 717                 }
 718                 break;
 719         case NETDEV_DOWN:
 720                 dev_hold(dev);
 721                 schedule_work(&wdev->cleanup_work);
 722                 break;
 723         case NETDEV_UP:
 724                 /*
 725                  * If we have a really quick DOWN/UP succession we may
 726                  * have this work still pending ... cancel it and see
 727                  * if it was pending, in which case we need to account
 728                  * for some of the work it would have done.
 729                  */
 730                 if (cancel_work_sync(&wdev->cleanup_work)) {
 731                         mutex_lock(&rdev->devlist_mtx);
 732                         rdev->opencount--;
 733                         mutex_unlock(&rdev->devlist_mtx);
 734                         dev_put(dev);
 735                 }
 736 #ifdef CONFIG_CFG80211_WEXT
 737                 cfg80211_lock_rdev(rdev);
 738                 mutex_lock(&rdev->devlist_mtx);
 739                 wdev_lock(wdev);
 740                 switch (wdev->iftype) {
 741                 case NL80211_IFTYPE_ADHOC:
 742                         cfg80211_ibss_wext_join(rdev, wdev);
 743                         break;
 744                 case NL80211_IFTYPE_STATION:
 745                         cfg80211_mgd_wext_connect(rdev, wdev);
 746                         break;
 747                 default:
 748                         break;
 749                 }
 750                 wdev_unlock(wdev);
 751                 rdev->opencount++;
 752                 mutex_unlock(&rdev->devlist_mtx);
 753                 cfg80211_unlock_rdev(rdev);
 754 #endif
 755                 break;
 756         case NETDEV_UNREGISTER:
 757                 /*
 758                  * NB: cannot take rdev->mtx here because this may be
 759                  * called within code protected by it when interfaces
 760                  * are removed with nl80211.
 761                  */
 762                 mutex_lock(&rdev->devlist_mtx);
 763                 /*
 764                  * It is possible to get NETDEV_UNREGISTER
 765                  * multiple times. To detect that, check
 766                  * that the interface is still on the list
 767                  * of registered interfaces, and only then
 768                  * remove and clean it up.
 769                  */
 770                 if (!list_empty(&wdev->list)) {
 771                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 772                         list_del_init(&wdev->list);
 773                         rdev->devlist_generation++;
 774 #ifdef CONFIG_CFG80211_WEXT
 775                         kfree(wdev->wext.keys);
 776 #endif
 777                 }
 778                 mutex_unlock(&rdev->devlist_mtx);
 779                 break;
 780         case NETDEV_PRE_UP:
 781                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 782                         return notifier_from_errno(-EOPNOTSUPP);
 783                 if (rfkill_blocked(rdev->rfkill))
 784                         return notifier_from_errno(-ERFKILL);
 785                 break;
 786         }
 787
 788         return NOTIFY_DONE;
 789 }
 790
 791 static struct notifier_block cfg80211_netdev_notifier = {
 792         .notifier_call = cfg80211_netdev_notifier_call,
 793 };
 794
 795 static void __net_exit cfg80211_pernet_exit(struct net *net)
 796 {
 797         struct cfg80211_registered_device *rdev;
 798
 799         rtnl_lock();
 800         mutex_lock(&cfg80211_mutex);
 801         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 802                 if (net_eq(wiphy_net(&rdev->wiphy), net))
 803                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
 804         }
 805         mutex_unlock(&cfg80211_mutex);
 806         rtnl_unlock();
 807 }
 808
 809 static struct pernet_operations cfg80211_pernet_ops = {
 810         .exit = cfg80211_pernet_exit,
 811 };
 812
 813 static int __init cfg80211_init(void)
 814 {
 815         int err;
 816
 817         err = register_pernet_device(&cfg80211_pernet_ops);
 818         if (err)
 819                 goto out_fail_pernet;
 820
 821         err = wiphy_sysfs_init();
 822         if (err)
 823                 goto out_fail_sysfs;
 824
 825         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
 826         if (err)
 827                 goto out_fail_notifier;
 828
 829         err = nl80211_init();
 830         if (err)
 831                 goto out_fail_nl80211;
 832
 833         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
 834
 835         err = regulatory_init();
 836         if (err)
 837                 goto out_fail_reg;
 838
 839         return 0;
 840
 841 out_fail_reg:
 842         debugfs_remove(ieee80211_debugfs_dir);
 843 out_fail_nl80211:
 844         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 845 out_fail_notifier:
 846         wiphy_sysfs_exit();
 847 out_fail_sysfs:
 848         unregister_pernet_device(&cfg80211_pernet_ops);
 849 out_fail_pernet:
 850         return err;
 851 }
 852 subsys_initcall(cfg80211_init);
 853
 854 static void cfg80211_exit(void)
 855 {
 856         debugfs_remove(ieee80211_debugfs_dir);
 857         nl80211_exit();
 858         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 859         wiphy_sysfs_exit();
 860         regulatory_exit();
 861         unregister_pernet_device(&cfg80211_pernet_ops);
 862 }
 863 module_exit(cfg80211_exit);