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         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 417                 return -EINVAL;
 418
 419         if (WARN_ON(wiphy->addresses &&
 420                     !is_zero_ether_addr(wiphy->perm_addr) &&
 421                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 422                            ETH_ALEN)))
 423                 return -EINVAL;
 424
 425         if (wiphy->addresses)
 426                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 427
 428         /* sanity check ifmodes */
 429         WARN_ON(!ifmodes);
 430         ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
 431         if (WARN_ON(ifmodes != wiphy->interface_modes))
 432                 wiphy->interface_modes = ifmodes;
 433
 434         /* sanity check supported bands/channels */
 435         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 436                 sband = wiphy->bands[band];
 437                 if (!sband)
 438                         continue;
 439
 440                 sband->band = band;
 441
 442                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
 443                         return -EINVAL;
 444
 445                 /*
 446                  * Since we use a u32 for rate bitmaps in
 447                  * ieee80211_get_response_rate, we cannot
 448                  * have more than 32 legacy rates.
 449                  */
 450                 if (WARN_ON(sband->n_bitrates > 32))
 451                         return -EINVAL;
 452
 453                 for (i = 0; i < sband->n_channels; i++) {
 454                         sband->channels[i].orig_flags =
 455                                 sband->channels[i].flags;
 456                         sband->channels[i].orig_mag =
 457                                 sband->channels[i].max_antenna_gain;
 458                         sband->channels[i].orig_mpwr =
 459                                 sband->channels[i].max_power;
 460                         sband->channels[i].band = band;
 461                 }
 462
 463                 have_band = true;
 464         }
 465
 466         if (!have_band) {
 467                 WARN_ON(1);
 468                 return -EINVAL;
 469         }
 470
 471         /* check and set up bitrates */
 472         ieee80211_set_bitrate_flags(wiphy);
 473
 474         res = device_add(&rdev->wiphy.dev);
 475         if (res)
 476                 return res;
 477
 478         res = rfkill_register(rdev->rfkill);
 479         if (res)
 480                 goto out_rm_dev;
 481
 482         mutex_lock(&cfg80211_mutex);
 483
 484         /* set up regulatory info */
 485         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
 486
 487         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 488         cfg80211_rdev_list_generation++;
 489
 490         mutex_unlock(&cfg80211_mutex);
 491
 492         /* add to debugfs */
 493         rdev->wiphy.debugfsdir =
 494                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 495                                    ieee80211_debugfs_dir);
 496         if (IS_ERR(rdev->wiphy.debugfsdir))
 497                 rdev->wiphy.debugfsdir = NULL;
 498
 499         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
 500                 struct regulatory_request request;
 501
 502                 request.wiphy_idx = get_wiphy_idx(wiphy);
 503                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 504                 request.alpha2[0] = '9';
 505                 request.alpha2[1] = '9';
 506
 507                 nl80211_send_reg_change_event(&request);
 508         }
 509
 510         cfg80211_debugfs_rdev_add(rdev);
 511
 512         return 0;
 513
 514  out_rm_dev:
 515         device_del(&rdev->wiphy.dev);
 516         return res;
 517 }
 518 EXPORT_SYMBOL(wiphy_register);
 519
 520 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 521 {
 522         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 523
 524         if (!rdev->ops->rfkill_poll)
 525                 return;
 526         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 527         rfkill_resume_polling(rdev->rfkill);
 528 }
 529 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 530
 531 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 532 {
 533         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 534
 535         rfkill_pause_polling(rdev->rfkill);
 536 }
 537 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 538
 539 void wiphy_unregister(struct wiphy *wiphy)
 540 {
 541         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 542
 543         rfkill_unregister(rdev->rfkill);
 544
 545         /* protect the device list */
 546         mutex_lock(&cfg80211_mutex);
 547
 548         wait_event(rdev->dev_wait, ({
 549                 int __count;
 550                 mutex_lock(&rdev->devlist_mtx);
 551                 __count = rdev->opencount;
 552                 mutex_unlock(&rdev->devlist_mtx);
 553                 __count == 0;}));
 554
 555         mutex_lock(&rdev->devlist_mtx);
 556         BUG_ON(!list_empty(&rdev->netdev_list));
 557         mutex_unlock(&rdev->devlist_mtx);
 558
 559         /*
 560          * First remove the hardware from everywhere, this makes
 561          * it impossible to find from userspace.
 562          */
 563         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 564         list_del_rcu(&rdev->list);
 565         synchronize_rcu();
 566
 567         /*
 568          * Try to grab rdev->mtx. If a command is still in progress,
 569          * hopefully the driver will refuse it since it's tearing
 570          * down the device already. We wait for this command to complete
 571          * before unlinking the item from the list.
 572          * Note: as codified by the BUG_ON above we cannot get here if
 573          * a virtual interface is still present. Hence, we can only get
 574          * to lock contention here if userspace issues a command that
 575          * identified the hardware by wiphy index.
 576          */
 577         cfg80211_lock_rdev(rdev);
 578         /* nothing */
 579         cfg80211_unlock_rdev(rdev);
 580
 581         /* If this device got a regulatory hint tell core its
 582          * free to listen now to a new shiny device regulatory hint */
 583         reg_device_remove(wiphy);
 584
 585         cfg80211_rdev_list_generation++;
 586         device_del(&rdev->wiphy.dev);
 587
 588         mutex_unlock(&cfg80211_mutex);
 589
 590         flush_work(&rdev->scan_done_wk);
 591         cancel_work_sync(&rdev->conn_work);
 592         flush_work(&rdev->event_work);
 593 }
 594 EXPORT_SYMBOL(wiphy_unregister);
 595
 596 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 597 {
 598         struct cfg80211_internal_bss *scan, *tmp;
 599         rfkill_destroy(rdev->rfkill);
 600         mutex_destroy(&rdev->mtx);
 601         mutex_destroy(&rdev->devlist_mtx);
 602         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 603                 cfg80211_put_bss(&scan->pub);
 604         kfree(rdev);
 605 }
 606
 607 void wiphy_free(struct wiphy *wiphy)
 608 {
 609         put_device(&wiphy->dev);
 610 }
 611 EXPORT_SYMBOL(wiphy_free);
 612
 613 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 614 {
 615         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 616
 617         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 618                 schedule_work(&rdev->rfkill_sync);
 619 }
 620 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 621
 622 static void wdev_cleanup_work(struct work_struct *work)
 623 {
 624         struct wireless_dev *wdev;
 625         struct cfg80211_registered_device *rdev;
 626
 627         wdev = container_of(work, struct wireless_dev, cleanup_work);
 628         rdev = wiphy_to_dev(wdev->wiphy);
 629
 630         cfg80211_lock_rdev(rdev);
 631
 632         if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
 633                 rdev->scan_req->aborted = true;
 634                 ___cfg80211_scan_done(rdev, true);
 635         }
 636
 637         cfg80211_unlock_rdev(rdev);
 638
 639         mutex_lock(&rdev->devlist_mtx);
 640         rdev->opencount--;
 641         mutex_unlock(&rdev->devlist_mtx);
 642         wake_up(&rdev->dev_wait);
 643
 644         dev_put(wdev->netdev);
 645 }
 646
 647 static struct device_type wiphy_type = {
 648         .name   = "wlan",
 649 };
 650
 651 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
 652                                          unsigned long state,
 653                                          void *ndev)
 654 {
 655         struct net_device *dev = ndev;
 656         struct wireless_dev *wdev = dev->ieee80211_ptr;
 657         struct cfg80211_registered_device *rdev;
 658
 659         if (!wdev)
 660                 return NOTIFY_DONE;
 661
 662         rdev = wiphy_to_dev(wdev->wiphy);
 663
 664         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 665
 666         switch (state) {
 667         case NETDEV_POST_INIT:
 668                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 669                 break;
 670         case NETDEV_REGISTER:
 671                 /*
 672                  * NB: cannot take rdev->mtx here because this may be
 673                  * called within code protected by it when interfaces
 674                  * are added with nl80211.
 675                  */
 676                 mutex_init(&wdev->mtx);
 677                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
 678                 INIT_LIST_HEAD(&wdev->event_list);
 679                 spin_lock_init(&wdev->event_lock);
 680                 mutex_lock(&rdev->devlist_mtx);
 681                 list_add_rcu(&wdev->list, &rdev->netdev_list);
 682                 rdev->devlist_generation++;
 683                 /* can only change netns with wiphy */
 684                 dev->features |= NETIF_F_NETNS_LOCAL;
 685
 686                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 687                                       "phy80211")) {
 688                         printk(KERN_ERR "wireless: failed to add phy80211 "
 689                                 "symlink to netdev!\n");
 690                 }
 691                 wdev->netdev = dev;
 692                 wdev->sme_state = CFG80211_SME_IDLE;
 693                 mutex_unlock(&rdev->devlist_mtx);
 694 #ifdef CONFIG_CFG80211_WEXT
 695                 wdev->wext.default_key = -1;
 696                 wdev->wext.default_mgmt_key = -1;
 697                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 698                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
 699                         wdev->wext.ps = true;
 700                 else
 701                         wdev->wext.ps = false;
 702                 wdev->wext.ps_timeout = 100;
 703                 if (rdev->ops->set_power_mgmt)
 704                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
 705                                                       wdev->wext.ps,
 706                                                       wdev->wext.ps_timeout)) {
 707                                 /* assume this means it's off */
 708                                 wdev->wext.ps = false;
 709                         }
 710 #endif
 711                 if (!dev->ethtool_ops)
 712                         dev->ethtool_ops = &cfg80211_ethtool_ops;
 713
 714                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 715                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
 716                         dev->priv_flags |= IFF_DONT_BRIDGE;
 717                 break;
 718         case NETDEV_GOING_DOWN:
 719                 switch (wdev->iftype) {
 720                 case NL80211_IFTYPE_ADHOC:
 721                         cfg80211_leave_ibss(rdev, dev, true);
 722                         break;
 723                 case NL80211_IFTYPE_STATION:
 724                         wdev_lock(wdev);
 725 #ifdef CONFIG_CFG80211_WEXT
 726                         kfree(wdev->wext.ie);
 727                         wdev->wext.ie = NULL;
 728                         wdev->wext.ie_len = 0;
 729                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 730 #endif
 731                         __cfg80211_disconnect(rdev, dev,
 732                                               WLAN_REASON_DEAUTH_LEAVING, true);
 733                         cfg80211_mlme_down(rdev, dev);
 734                         wdev_unlock(wdev);
 735                         break;
 736                 default:
 737                         break;
 738                 }
 739                 break;
 740         case NETDEV_DOWN:
 741                 dev_hold(dev);
 742                 queue_work(cfg80211_wq, &wdev->cleanup_work);
 743                 break;
 744         case NETDEV_UP:
 745                 /*
 746                  * If we have a really quick DOWN/UP succession we may
 747                  * have this work still pending ... cancel it and see
 748                  * if it was pending, in which case we need to account
 749                  * for some of the work it would have done.
 750                  */
 751                 if (cancel_work_sync(&wdev->cleanup_work)) {
 752                         mutex_lock(&rdev->devlist_mtx);
 753                         rdev->opencount--;
 754                         mutex_unlock(&rdev->devlist_mtx);
 755                         dev_put(dev);
 756                 }
 757                 cfg80211_lock_rdev(rdev);
 758                 mutex_lock(&rdev->devlist_mtx);
 759 #ifdef CONFIG_CFG80211_WEXT
 760                 wdev_lock(wdev);
 761                 switch (wdev->iftype) {
 762                 case NL80211_IFTYPE_ADHOC:
 763                         cfg80211_ibss_wext_join(rdev, wdev);
 764                         break;
 765                 case NL80211_IFTYPE_STATION:
 766                         cfg80211_mgd_wext_connect(rdev, wdev);
 767                         break;
 768                 default:
 769                         break;
 770                 }
 771                 wdev_unlock(wdev);
 772 #endif
 773                 rdev->opencount++;
 774                 mutex_unlock(&rdev->devlist_mtx);
 775                 cfg80211_unlock_rdev(rdev);
 776                 break;
 777         case NETDEV_UNREGISTER:
 778                 /*
 779                  * NB: cannot take rdev->mtx here because this may be
 780                  * called within code protected by it when interfaces
 781                  * are removed with nl80211.
 782                  */
 783                 mutex_lock(&rdev->devlist_mtx);
 784                 /*
 785                  * It is possible to get NETDEV_UNREGISTER
 786                  * multiple times. To detect that, check
 787                  * that the interface is still on the list
 788                  * of registered interfaces, and only then
 789                  * remove and clean it up.
 790                  */
 791                 if (!list_empty(&wdev->list)) {
 792                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 793                         list_del_rcu(&wdev->list);
 794                         rdev->devlist_generation++;
 795 #ifdef CONFIG_CFG80211_WEXT
 796                         kfree(wdev->wext.keys);
 797 #endif
 798                 }
 799                 mutex_unlock(&rdev->devlist_mtx);
 800                 /*
 801                  * synchronise (so that we won't find this netdev
 802                  * from other code any more) and then clear the list
 803                  * head so that the above code can safely check for
 804                  * !list_empty() to avoid double-cleanup.
 805                  */
 806                 synchronize_rcu();
 807                 INIT_LIST_HEAD(&wdev->list);
 808                 break;
 809         case NETDEV_PRE_UP:
 810                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 811                         return notifier_from_errno(-EOPNOTSUPP);
 812                 if (rfkill_blocked(rdev->rfkill))
 813                         return notifier_from_errno(-ERFKILL);
 814                 break;
 815         }
 816
 817         return NOTIFY_DONE;
 818 }
 819
 820 static struct notifier_block cfg80211_netdev_notifier = {
 821         .notifier_call = cfg80211_netdev_notifier_call,
 822 };
 823
 824 static void __net_exit cfg80211_pernet_exit(struct net *net)
 825 {
 826         struct cfg80211_registered_device *rdev;
 827
 828         rtnl_lock();
 829         mutex_lock(&cfg80211_mutex);
 830         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 831                 if (net_eq(wiphy_net(&rdev->wiphy), net))
 832                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
 833         }
 834         mutex_unlock(&cfg80211_mutex);
 835         rtnl_unlock();
 836 }
 837
 838 static struct pernet_operations cfg80211_pernet_ops = {
 839         .exit = cfg80211_pernet_exit,
 840 };
 841
 842 static int __init cfg80211_init(void)
 843 {
 844         int err;
 845
 846         err = register_pernet_device(&cfg80211_pernet_ops);
 847         if (err)
 848                 goto out_fail_pernet;
 849
 850         err = wiphy_sysfs_init();
 851         if (err)
 852                 goto out_fail_sysfs;
 853
 854         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
 855         if (err)
 856                 goto out_fail_notifier;
 857
 858         err = nl80211_init();
 859         if (err)
 860                 goto out_fail_nl80211;
 861
 862         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
 863
 864         err = regulatory_init();
 865         if (err)
 866                 goto out_fail_reg;
 867
 868         cfg80211_wq = create_singlethread_workqueue("cfg80211");
 869         if (!cfg80211_wq)
 870                 goto out_fail_wq;
 871
 872         return 0;
 873
 874 out_fail_wq:
 875         regulatory_exit();
 876 out_fail_reg:
 877         debugfs_remove(ieee80211_debugfs_dir);
 878 out_fail_nl80211:
 879         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 880 out_fail_notifier:
 881         wiphy_sysfs_exit();
 882 out_fail_sysfs:
 883         unregister_pernet_device(&cfg80211_pernet_ops);
 884 out_fail_pernet:
 885         return err;
 886 }
 887 subsys_initcall(cfg80211_init);
 888
 889 static void cfg80211_exit(void)
 890 {
 891         debugfs_remove(ieee80211_debugfs_dir);
 892         nl80211_exit();
 893         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 894         wiphy_sysfs_exit();
 895         regulatory_exit();
 896         unregister_pernet_device(&cfg80211_pernet_ops);
 897         destroy_workqueue(cfg80211_wq);
 898 }
 899 module_exit(cfg80211_exit);