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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   8
   9 #include <linux/if.h>
  10 #include <linux/module.h>
  11 #include <linux/err.h>
  12 #include <linux/list.h>
  13 #include <linux/slab.h>
  14 #include <linux/nl80211.h>
  15 #include <linux/debugfs.h>
  16 #include <linux/notifier.h>
  17 #include <linux/device.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/sched.h>
  21 #include <net/genetlink.h>
  22 #include <net/cfg80211.h>
  23 #include "nl80211.h"
  24 #include "core.h"
  25 #include "sysfs.h"
  26 #include "debugfs.h"
  27 #include "wext-compat.h"
  28 #include "ethtool.h"
  29
  30 /* name for sysfs, %d is appended */
  31 #define PHY_NAME "phy"
  32
  33 MODULE_AUTHOR("Johannes Berg");
  34 MODULE_LICENSE("GPL");
  35 MODULE_DESCRIPTION("wireless configuration support");
  36
  37 /* RCU-protected (and cfg80211_mutex for writers) */
  38 LIST_HEAD(cfg80211_rdev_list);
  39 int cfg80211_rdev_list_generation;
  40
  41 DEFINE_MUTEX(cfg80211_mutex);
  42
  43 /* for debugfs */
  44 static struct dentry *ieee80211_debugfs_dir;
  45
  46 /* for the cleanup, scan and event works */
  47 struct workqueue_struct *cfg80211_wq;
  48
  49 /* requires cfg80211_mutex to be held! */
  50 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  51 {
  52         struct cfg80211_registered_device *result = NULL, *rdev;
  53
  54         if (!wiphy_idx_valid(wiphy_idx))
  55                 return NULL;
  56
  57         assert_cfg80211_lock();
  58
  59         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  60                 if (rdev->wiphy_idx == wiphy_idx) {
  61                         result = rdev;
  62                         break;
  63                 }
  64         }
  65
  66         return result;
  67 }
  68
  69 int get_wiphy_idx(struct wiphy *wiphy)
  70 {
  71         struct cfg80211_registered_device *rdev;
  72         if (!wiphy)
  73                 return WIPHY_IDX_STALE;
  74         rdev = wiphy_to_dev(wiphy);
  75         return rdev->wiphy_idx;
  76 }
  77
  78 /* requires cfg80211_rdev_mutex to be held! */
  79 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  80 {
  81         struct cfg80211_registered_device *rdev;
  82
  83         if (!wiphy_idx_valid(wiphy_idx))
  84                 return NULL;
  85
  86         assert_cfg80211_lock();
  87
  88         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  89         if (!rdev)
  90                 return NULL;
  91         return &rdev->wiphy;
  92 }
  93
  94 /* requires cfg80211_mutex to be held! */
  95 struct cfg80211_registered_device *
  96 __cfg80211_rdev_from_info(struct genl_info *info)
  97 {
  98         int ifindex;
  99         struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
 100         struct net_device *dev;
 101         int err = -EINVAL;
 102
 103         assert_cfg80211_lock();
 104
 105         if (info->attrs[NL80211_ATTR_WIPHY]) {
 106                 bywiphyidx = cfg80211_rdev_by_wiphy_idx(
 107                                 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
 108                 err = -ENODEV;
 109         }
 110
 111         if (info->attrs[NL80211_ATTR_IFINDEX]) {
 112                 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
 113                 dev = dev_get_by_index(genl_info_net(info), ifindex);
 114                 if (dev) {
 115                         if (dev->ieee80211_ptr)
 116                                 byifidx =
 117                                         wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 118                         dev_put(dev);
 119                 }
 120                 err = -ENODEV;
 121         }
 122
 123         if (bywiphyidx && byifidx) {
 124                 if (bywiphyidx != byifidx)
 125                         return ERR_PTR(-EINVAL);
 126                 else
 127                         return bywiphyidx; /* == byifidx */
 128         }
 129         if (bywiphyidx)
 130                 return bywiphyidx;
 131
 132         if (byifidx)
 133                 return byifidx;
 134
 135         return ERR_PTR(err);
 136 }
 137
 138 struct cfg80211_registered_device *
 139 cfg80211_get_dev_from_info(struct genl_info *info)
 140 {
 141         struct cfg80211_registered_device *rdev;
 142
 143         mutex_lock(&cfg80211_mutex);
 144         rdev = __cfg80211_rdev_from_info(info);
 145
 146         /* if it is not an error we grab the lock on
 147          * it to assure it won't be going away while
 148          * we operate on it */
 149         if (!IS_ERR(rdev))
 150                 mutex_lock(&rdev->mtx);
 151
 152         mutex_unlock(&cfg80211_mutex);
 153
 154         return rdev;
 155 }
 156
 157 struct cfg80211_registered_device *
 158 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
 159 {
 160         struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
 161         struct net_device *dev;
 162
 163         mutex_lock(&cfg80211_mutex);
 164         dev = dev_get_by_index(net, ifindex);
 165         if (!dev)
 166                 goto out;
 167         if (dev->ieee80211_ptr) {
 168                 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 169                 mutex_lock(&rdev->mtx);
 170         } else
 171                 rdev = ERR_PTR(-ENODEV);
 172         dev_put(dev);
 173  out:
 174         mutex_unlock(&cfg80211_mutex);
 175         return rdev;
 176 }
 177
 178 /* requires cfg80211_mutex to be held */
 179 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 180                         char *newname)
 181 {
 182         struct cfg80211_registered_device *rdev2;
 183         int wiphy_idx, taken = -1, result, digits;
 184
 185         assert_cfg80211_lock();
 186
 187         /* prohibit calling the thing phy%d when %d is not its number */
 188         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 189         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 190                 /* count number of places needed to print wiphy_idx */
 191                 digits = 1;
 192                 while (wiphy_idx /= 10)
 193                         digits++;
 194                 /*
 195                  * deny the name if it is phy<idx> where <idx> is printed
 196                  * without leading zeroes. taken == strlen(newname) here
 197                  */
 198                 if (taken == strlen(PHY_NAME) + digits)
 199                         return -EINVAL;
 200         }
 201
 202
 203         /* Ignore nop renames */
 204         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
 205                 return 0;
 206
 207         /* Ensure another device does not already have this name. */
 208         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 209                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
 210                         return -EINVAL;
 211
 212         result = device_rename(&rdev->wiphy.dev, newname);
 213         if (result)
 214                 return result;
 215
 216         if (rdev->wiphy.debugfsdir &&
 217             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 218                             rdev->wiphy.debugfsdir,
 219                             rdev->wiphy.debugfsdir->d_parent,
 220                             newname))
 221                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 222
 223         nl80211_notify_dev_rename(rdev);
 224
 225         return 0;
 226 }
 227
 228 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 229                           struct net *net)
 230 {
 231         struct wireless_dev *wdev;
 232         int err = 0;
 233
 234         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 235                 return -EOPNOTSUPP;
 236
 237         list_for_each_entry(wdev, &rdev->netdev_list, list) {
 238                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 239                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 240                 if (err)
 241                         break;
 242                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 243         }
 244
 245         if (err) {
 246                 /* failed -- clean up to old netns */
 247                 net = wiphy_net(&rdev->wiphy);
 248
 249                 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
 250                                                      list) {
 251                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 252                         err = dev_change_net_namespace(wdev->netdev, net,
 253                                                         "wlan%d");
 254                         WARN_ON(err);
 255                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 256                 }
 257
 258                 return err;
 259         }
 260
 261         wiphy_net_set(&rdev->wiphy, net);
 262
 263         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 264         WARN_ON(err);
 265
 266         return 0;
 267 }
 268
 269 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 270 {
 271         struct cfg80211_registered_device *rdev = data;
 272
 273         rdev->ops->rfkill_poll(&rdev->wiphy);
 274 }
 275
 276 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 277 {
 278         struct cfg80211_registered_device *rdev = data;
 279         struct wireless_dev *wdev;
 280
 281         if (!blocked)
 282                 return 0;
 283
 284         rtnl_lock();
 285         mutex_lock(&rdev->devlist_mtx);
 286
 287         list_for_each_entry(wdev, &rdev->netdev_list, list)
 288                 dev_close(wdev->netdev);
 289
 290         mutex_unlock(&rdev->devlist_mtx);
 291         rtnl_unlock();
 292
 293         return 0;
 294 }
 295
 296 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 297 {
 298         struct cfg80211_registered_device *rdev;
 299
 300         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 301         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 302 }
 303
 304 static void cfg80211_event_work(struct work_struct *work)
 305 {
 306         struct cfg80211_registered_device *rdev;
 307
 308         rdev = container_of(work, struct cfg80211_registered_device,
 309                             event_work);
 310
 311         rtnl_lock();
 312         cfg80211_lock_rdev(rdev);
 313
 314         cfg80211_process_rdev_events(rdev);
 315         cfg80211_unlock_rdev(rdev);
 316         rtnl_unlock();
 317 }
 318
 319 /* exported functions */
 320
 321 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 322 {
 323         static int wiphy_counter;
 324
 325         struct cfg80211_registered_device *rdev;
 326         int alloc_size;
 327
 328         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 329         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 330         WARN_ON(ops->connect && !ops->disconnect);
 331         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 332         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 333         WARN_ON(ops->add_station && !ops->del_station);
 334         WARN_ON(ops->add_mpath && !ops->del_mpath);
 335         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 336
 337         alloc_size = sizeof(*rdev) + sizeof_priv;
 338
 339         rdev = kzalloc(alloc_size, GFP_KERNEL);
 340         if (!rdev)
 341                 return NULL;
 342
 343         rdev->ops = ops;
 344
 345         mutex_lock(&cfg80211_mutex);
 346
 347         rdev->wiphy_idx = wiphy_counter++;
 348
 349         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
 350                 wiphy_counter--;
 351                 mutex_unlock(&cfg80211_mutex);
 352                 /* ugh, wrapped! */
 353                 kfree(rdev);
 354                 return NULL;
 355         }
 356
 357         mutex_unlock(&cfg80211_mutex);
 358
 359         /* give it a proper name */
 360         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 361
 362         mutex_init(&rdev->mtx);
 363         mutex_init(&rdev->devlist_mtx);
 364         INIT_LIST_HEAD(&rdev->netdev_list);
 365         spin_lock_init(&rdev->bss_lock);
 366         INIT_LIST_HEAD(&rdev->bss_list);
 367         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 368
 369 #ifdef CONFIG_CFG80211_WEXT
 370         rdev->wiphy.wext = &cfg80211_wext_handler;
 371 #endif
 372
 373         device_initialize(&rdev->wiphy.dev);
 374         rdev->wiphy.dev.class = &ieee80211_class;
 375         rdev->wiphy.dev.platform_data = rdev;
 376
 377 #ifdef CONFIG_CFG80211_DEFAULT_PS
 378         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 379 #endif
 380
 381         wiphy_net_set(&rdev->wiphy, &init_net);
 382
 383         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 384         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 385                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 386                                    &rdev->rfkill_ops, rdev);
 387
 388         if (!rdev->rfkill) {
 389                 kfree(rdev);
 390                 return NULL;
 391         }
 392
 393         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 394         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 395         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 396
 397         init_waitqueue_head(&rdev->dev_wait);
 398
 399         /*
 400          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 401          * Fragmentation and RTS threshold are disabled by default with the
 402          * special -1 value.
 403          */
 404         rdev->wiphy.retry_short = 7;
 405         rdev->wiphy.retry_long = 4;
 406         rdev->wiphy.frag_threshold = (u32) -1;
 407         rdev->wiphy.rts_threshold = (u32) -1;
 408         rdev->wiphy.coverage_class = 0;
 409
 410         return &rdev->wiphy;
 411 }
 412 EXPORT_SYMBOL(wiphy_new);
 413
 414 int wiphy_register(struct wiphy *wiphy)
 415 {
 416         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 417         int res;
 418         enum ieee80211_band band;
 419         struct ieee80211_supported_band *sband;
 420         bool have_band = false;
 421         int i;
 422         u16 ifmodes = wiphy->interface_modes;
 423
 424         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 425                 return -EINVAL;
 426
 427         if (WARN_ON(wiphy->addresses &&
 428                     !is_zero_ether_addr(wiphy->perm_addr) &&
 429                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 430                            ETH_ALEN)))
 431                 return -EINVAL;
 432
 433         if (wiphy->addresses)
 434                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 435
 436         /* sanity check ifmodes */
 437         WARN_ON(!ifmodes);
 438         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 439         if (WARN_ON(ifmodes != wiphy->interface_modes))
 440                 wiphy->interface_modes = ifmodes;
 441
 442         /* sanity check supported bands/channels */
 443         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 444                 sband = wiphy->bands[band];
 445                 if (!sband)
 446                         continue;
 447
 448                 sband->band = band;
 449
 450                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
 451                         return -EINVAL;
 452
 453                 /*
 454                  * Since we use a u32 for rate bitmaps in
 455                  * ieee80211_get_response_rate, we cannot
 456                  * have more than 32 legacy rates.
 457                  */
 458                 if (WARN_ON(sband->n_bitrates > 32))
 459                         return -EINVAL;
 460
 461                 for (i = 0; i < sband->n_channels; i++) {
 462                         sband->channels[i].orig_flags =
 463                                 sband->channels[i].flags;
 464                         sband->channels[i].orig_mag =
 465                                 sband->channels[i].max_antenna_gain;
 466                         sband->channels[i].orig_mpwr =
 467                                 sband->channels[i].max_power;
 468                         sband->channels[i].band = band;
 469                 }
 470
 471                 have_band = true;
 472         }
 473
 474         if (!have_band) {
 475                 WARN_ON(1);
 476                 return -EINVAL;
 477         }
 478
 479         /* check and set up bitrates */
 480         ieee80211_set_bitrate_flags(wiphy);
 481
 482         mutex_lock(&cfg80211_mutex);
 483
 484         res = device_add(&rdev->wiphy.dev);
 485         if (res) {
 486                 mutex_unlock(&cfg80211_mutex);
 487                 return res;
 488         }
 489
 490         /* set up regulatory info */
 491         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
 492
 493         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 494         cfg80211_rdev_list_generation++;
 495
 496         /* add to debugfs */
 497         rdev->wiphy.debugfsdir =
 498                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 499                                    ieee80211_debugfs_dir);
 500         if (IS_ERR(rdev->wiphy.debugfsdir))
 501                 rdev->wiphy.debugfsdir = NULL;
 502
 503         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
 504                 struct regulatory_request request;
 505
 506                 request.wiphy_idx = get_wiphy_idx(wiphy);
 507                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 508                 request.alpha2[0] = '9';
 509                 request.alpha2[1] = '9';
 510
 511                 nl80211_send_reg_change_event(&request);
 512         }
 513
 514         cfg80211_debugfs_rdev_add(rdev);
 515         mutex_unlock(&cfg80211_mutex);
 516
 517         /*
 518          * due to a locking dependency this has to be outside of the
 519          * cfg80211_mutex lock
 520          */
 521         res = rfkill_register(rdev->rfkill);
 522         if (res)
 523                 goto out_rm_dev;
 524
 525         return 0;
 526
 527 out_rm_dev:
 528         device_del(&rdev->wiphy.dev);
 529         return res;
 530 }
 531 EXPORT_SYMBOL(wiphy_register);
 532
 533 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 534 {
 535         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 536
 537         if (!rdev->ops->rfkill_poll)
 538                 return;
 539         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 540         rfkill_resume_polling(rdev->rfkill);
 541 }
 542 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 543
 544 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 545 {
 546         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 547
 548         rfkill_pause_polling(rdev->rfkill);
 549 }
 550 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 551
 552 void wiphy_unregister(struct wiphy *wiphy)
 553 {
 554         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 555
 556         rfkill_unregister(rdev->rfkill);
 557
 558         /* protect the device list */
 559         mutex_lock(&cfg80211_mutex);
 560
 561         wait_event(rdev->dev_wait, ({
 562                 int __count;
 563                 mutex_lock(&rdev->devlist_mtx);
 564                 __count = rdev->opencount;
 565                 mutex_unlock(&rdev->devlist_mtx);
 566                 __count == 0;}));
 567
 568         mutex_lock(&rdev->devlist_mtx);
 569         BUG_ON(!list_empty(&rdev->netdev_list));
 570         mutex_unlock(&rdev->devlist_mtx);
 571
 572         /*
 573          * First remove the hardware from everywhere, this makes
 574          * it impossible to find from userspace.
 575          */
 576         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 577         list_del_rcu(&rdev->list);
 578         synchronize_rcu();
 579
 580         /*
 581          * Try to grab rdev->mtx. If a command is still in progress,
 582          * hopefully the driver will refuse it since it's tearing
 583          * down the device already. We wait for this command to complete
 584          * before unlinking the item from the list.
 585          * Note: as codified by the BUG_ON above we cannot get here if
 586          * a virtual interface is still present. Hence, we can only get
 587          * to lock contention here if userspace issues a command that
 588          * identified the hardware by wiphy index.
 589          */
 590         cfg80211_lock_rdev(rdev);
 591         /* nothing */
 592         cfg80211_unlock_rdev(rdev);
 593
 594         /* If this device got a regulatory hint tell core its
 595          * free to listen now to a new shiny device regulatory hint */
 596         reg_device_remove(wiphy);
 597
 598         cfg80211_rdev_list_generation++;
 599         device_del(&rdev->wiphy.dev);
 600
 601         mutex_unlock(&cfg80211_mutex);
 602
 603         flush_work(&rdev->scan_done_wk);
 604         cancel_work_sync(&rdev->conn_work);
 605         flush_work(&rdev->event_work);
 606 }
 607 EXPORT_SYMBOL(wiphy_unregister);
 608
 609 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 610 {
 611         struct cfg80211_internal_bss *scan, *tmp;
 612         rfkill_destroy(rdev->rfkill);
 613         mutex_destroy(&rdev->mtx);
 614         mutex_destroy(&rdev->devlist_mtx);
 615         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 616                 cfg80211_put_bss(&scan->pub);
 617         kfree(rdev);
 618 }
 619
 620 void wiphy_free(struct wiphy *wiphy)
 621 {
 622         put_device(&wiphy->dev);
 623 }
 624 EXPORT_SYMBOL(wiphy_free);
 625
 626 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 627 {
 628         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 629
 630         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 631                 schedule_work(&rdev->rfkill_sync);
 632 }
 633 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 634
 635 static void wdev_cleanup_work(struct work_struct *work)
 636 {
 637         struct wireless_dev *wdev;
 638         struct cfg80211_registered_device *rdev;
 639
 640         wdev = container_of(work, struct wireless_dev, cleanup_work);
 641         rdev = wiphy_to_dev(wdev->wiphy);
 642
 643         cfg80211_lock_rdev(rdev);
 644
 645         if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
 646                 rdev->scan_req->aborted = true;
 647                 ___cfg80211_scan_done(rdev, true);
 648         }
 649
 650         cfg80211_unlock_rdev(rdev);
 651
 652         mutex_lock(&rdev->devlist_mtx);
 653         rdev->opencount--;
 654         mutex_unlock(&rdev->devlist_mtx);
 655         wake_up(&rdev->dev_wait);
 656
 657         dev_put(wdev->netdev);
 658 }
 659
 660 static struct device_type wiphy_type = {
 661         .name   = "wlan",
 662 };
 663
 664 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
 665                                          unsigned long state,
 666                                          void *ndev)
 667 {
 668         struct net_device *dev = ndev;
 669         struct wireless_dev *wdev = dev->ieee80211_ptr;
 670         struct cfg80211_registered_device *rdev;
 671
 672         if (!wdev)
 673                 return NOTIFY_DONE;
 674
 675         rdev = wiphy_to_dev(wdev->wiphy);
 676
 677         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 678
 679         switch (state) {
 680         case NETDEV_POST_INIT:
 681                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 682                 break;
 683         case NETDEV_REGISTER:
 684                 /*
 685                  * NB: cannot take rdev->mtx here because this may be
 686                  * called within code protected by it when interfaces
 687                  * are added with nl80211.
 688                  */
 689                 mutex_init(&wdev->mtx);
 690                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
 691                 INIT_LIST_HEAD(&wdev->event_list);
 692                 spin_lock_init(&wdev->event_lock);
 693                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
 694                 spin_lock_init(&wdev->mgmt_registrations_lock);
 695
 696                 mutex_lock(&rdev->devlist_mtx);
 697                 list_add_rcu(&wdev->list, &rdev->netdev_list);
 698                 rdev->devlist_generation++;
 699                 /* can only change netns with wiphy */
 700                 dev->features |= NETIF_F_NETNS_LOCAL;
 701
 702                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 703                                       "phy80211")) {
 704                         pr_err("failed to add phy80211 symlink to netdev!\n");
 705                 }
 706                 wdev->netdev = dev;
 707                 wdev->sme_state = CFG80211_SME_IDLE;
 708                 mutex_unlock(&rdev->devlist_mtx);
 709 #ifdef CONFIG_CFG80211_WEXT
 710                 wdev->wext.default_key = -1;
 711                 wdev->wext.default_mgmt_key = -1;
 712                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 713 #endif
 714
 715                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
 716                         wdev->ps = true;
 717                 else
 718                         wdev->ps = false;
 719                 /* allow mac80211 to determine the timeout */
 720                 wdev->ps_timeout = -1;
 721
 722                 if (!dev->ethtool_ops)
 723                         dev->ethtool_ops = &cfg80211_ethtool_ops;
 724
 725                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 726                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
 727                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
 728                         dev->priv_flags |= IFF_DONT_BRIDGE;
 729                 break;
 730         case NETDEV_GOING_DOWN:
 731                 switch (wdev->iftype) {
 732                 case NL80211_IFTYPE_ADHOC:
 733                         cfg80211_leave_ibss(rdev, dev, true);
 734                         break;
 735                 case NL80211_IFTYPE_P2P_CLIENT:
 736                 case NL80211_IFTYPE_STATION:
 737                         wdev_lock(wdev);
 738 #ifdef CONFIG_CFG80211_WEXT
 739                         kfree(wdev->wext.ie);
 740                         wdev->wext.ie = NULL;
 741                         wdev->wext.ie_len = 0;
 742                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 743 #endif
 744                         __cfg80211_disconnect(rdev, dev,
 745                                               WLAN_REASON_DEAUTH_LEAVING, true);
 746                         cfg80211_mlme_down(rdev, dev);
 747                         wdev_unlock(wdev);
 748                         break;
 749                 case NL80211_IFTYPE_MESH_POINT:
 750                         cfg80211_leave_mesh(rdev, dev);
 751                         break;
 752                 default:
 753                         break;
 754                 }
 755                 break;
 756         case NETDEV_DOWN:
 757                 dev_hold(dev);
 758                 queue_work(cfg80211_wq, &wdev->cleanup_work);
 759                 break;
 760         case NETDEV_UP:
 761                 /*
 762                  * If we have a really quick DOWN/UP succession we may
 763                  * have this work still pending ... cancel it and see
 764                  * if it was pending, in which case we need to account
 765                  * for some of the work it would have done.
 766                  */
 767                 if (cancel_work_sync(&wdev->cleanup_work)) {
 768                         mutex_lock(&rdev->devlist_mtx);
 769                         rdev->opencount--;
 770                         mutex_unlock(&rdev->devlist_mtx);
 771                         dev_put(dev);
 772                 }
 773                 cfg80211_lock_rdev(rdev);
 774                 mutex_lock(&rdev->devlist_mtx);
 775                 wdev_lock(wdev);
 776                 switch (wdev->iftype) {
 777 #ifdef CONFIG_CFG80211_WEXT
 778                 case NL80211_IFTYPE_ADHOC:
 779                         cfg80211_ibss_wext_join(rdev, wdev);
 780                         break;
 781                 case NL80211_IFTYPE_STATION:
 782                         cfg80211_mgd_wext_connect(rdev, wdev);
 783                         break;
 784 #endif
 785 #ifdef CONFIG_MAC80211_MESH
 786                 case NL80211_IFTYPE_MESH_POINT:
 787                         {
 788                                 /* backward compat code... */
 789                                 struct mesh_setup setup;
 790                                 memcpy(&setup, &default_mesh_setup,
 791                                                 sizeof(setup));
 792                                  /* back compat only needed for mesh_id */
 793                                 setup.mesh_id = wdev->ssid;
 794                                 setup.mesh_id_len = wdev->mesh_id_up_len;
 795                                 if (wdev->mesh_id_up_len)
 796                                         __cfg80211_join_mesh(rdev, dev,
 797                                                         &setup,
 798                                                         &default_mesh_config);
 799                                 break;
 800                         }
 801 #endif
 802                 default:
 803                         break;
 804                 }
 805                 wdev_unlock(wdev);
 806                 rdev->opencount++;
 807                 mutex_unlock(&rdev->devlist_mtx);
 808                 cfg80211_unlock_rdev(rdev);
 809
 810                 /*
 811                  * Configure power management to the driver here so that its
 812                  * correctly set also after interface type changes etc.
 813                  */
 814                 if (wdev->iftype == NL80211_IFTYPE_STATION &&
 815                     rdev->ops->set_power_mgmt)
 816                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
 817                                                       wdev->ps,
 818                                                       wdev->ps_timeout)) {
 819                                 /* assume this means it's off */
 820                                 wdev->ps = false;
 821                         }
 822                 break;
 823         case NETDEV_UNREGISTER:
 824                 /*
 825                  * NB: cannot take rdev->mtx here because this may be
 826                  * called within code protected by it when interfaces
 827                  * are removed with nl80211.
 828                  */
 829                 mutex_lock(&rdev->devlist_mtx);
 830                 /*
 831                  * It is possible to get NETDEV_UNREGISTER
 832                  * multiple times. To detect that, check
 833                  * that the interface is still on the list
 834                  * of registered interfaces, and only then
 835                  * remove and clean it up.
 836                  */
 837                 if (!list_empty(&wdev->list)) {
 838                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 839                         list_del_rcu(&wdev->list);
 840                         rdev->devlist_generation++;
 841                         cfg80211_mlme_purge_registrations(wdev);
 842 #ifdef CONFIG_CFG80211_WEXT
 843                         kfree(wdev->wext.keys);
 844 #endif
 845                 }
 846                 mutex_unlock(&rdev->devlist_mtx);
 847                 /*
 848                  * synchronise (so that we won't find this netdev
 849                  * from other code any more) and then clear the list
 850                  * head so that the above code can safely check for
 851                  * !list_empty() to avoid double-cleanup.
 852                  */
 853                 synchronize_rcu();
 854                 INIT_LIST_HEAD(&wdev->list);
 855                 break;
 856         case NETDEV_PRE_UP:
 857                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 858                         return notifier_from_errno(-EOPNOTSUPP);
 859                 if (rfkill_blocked(rdev->rfkill))
 860                         return notifier_from_errno(-ERFKILL);
 861                 break;
 862         }
 863
 864         return NOTIFY_DONE;
 865 }
 866
 867 static struct notifier_block cfg80211_netdev_notifier = {
 868         .notifier_call = cfg80211_netdev_notifier_call,
 869 };
 870
 871 static void __net_exit cfg80211_pernet_exit(struct net *net)
 872 {
 873         struct cfg80211_registered_device *rdev;
 874
 875         rtnl_lock();
 876         mutex_lock(&cfg80211_mutex);
 877         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 878                 if (net_eq(wiphy_net(&rdev->wiphy), net))
 879                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
 880         }
 881         mutex_unlock(&cfg80211_mutex);
 882         rtnl_unlock();
 883 }
 884
 885 static struct pernet_operations cfg80211_pernet_ops = {
 886         .exit = cfg80211_pernet_exit,
 887 };
 888
 889 static int __init cfg80211_init(void)
 890 {
 891         int err;
 892
 893         err = register_pernet_device(&cfg80211_pernet_ops);
 894         if (err)
 895                 goto out_fail_pernet;
 896
 897         err = wiphy_sysfs_init();
 898         if (err)
 899                 goto out_fail_sysfs;
 900
 901         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
 902         if (err)
 903                 goto out_fail_notifier;
 904
 905         err = nl80211_init();
 906         if (err)
 907                 goto out_fail_nl80211;
 908
 909         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
 910
 911         err = regulatory_init();
 912         if (err)
 913                 goto out_fail_reg;
 914
 915         cfg80211_wq = create_singlethread_workqueue("cfg80211");
 916         if (!cfg80211_wq)
 917                 goto out_fail_wq;
 918
 919         return 0;
 920
 921 out_fail_wq:
 922         regulatory_exit();
 923 out_fail_reg:
 924         debugfs_remove(ieee80211_debugfs_dir);
 925 out_fail_nl80211:
 926         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 927 out_fail_notifier:
 928         wiphy_sysfs_exit();
 929 out_fail_sysfs:
 930         unregister_pernet_device(&cfg80211_pernet_ops);
 931 out_fail_pernet:
 932         return err;
 933 }
 934 subsys_initcall(cfg80211_init);
 935
 936 static void __exit cfg80211_exit(void)
 937 {
 938         debugfs_remove(ieee80211_debugfs_dir);
 939         nl80211_exit();
 940         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 941         wiphy_sysfs_exit();
 942         regulatory_exit();
 943         unregister_pernet_device(&cfg80211_pernet_ops);
 944         destroy_workqueue(cfg80211_wq);
 945 }
 946 module_exit(cfg80211_exit);