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 #include "rdev-ops.h"
  30
  31 /* name for sysfs, %d is appended */
  32 #define PHY_NAME "phy"
  33
  34 MODULE_AUTHOR("Johannes Berg");
  35 MODULE_LICENSE("GPL");
  36 MODULE_DESCRIPTION("wireless configuration support");
  37
  38 /* RCU-protected (and cfg80211_mutex for writers) */
  39 LIST_HEAD(cfg80211_rdev_list);
  40 int cfg80211_rdev_list_generation;
  41
  42 DEFINE_MUTEX(cfg80211_mutex);
  43
  44 /* for debugfs */
  45 static struct dentry *ieee80211_debugfs_dir;
  46
  47 /* for the cleanup, scan and event works */
  48 struct workqueue_struct *cfg80211_wq;
  49
  50 static bool cfg80211_disable_40mhz_24ghz;
  51 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  52 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  53                  "Disable 40MHz support in the 2.4GHz band");
  54
  55 /* requires cfg80211_mutex to be held! */
  56 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  57 {
  58         struct cfg80211_registered_device *result = NULL, *rdev;
  59
  60         if (!wiphy_idx_valid(wiphy_idx))
  61                 return NULL;
  62
  63         assert_cfg80211_lock();
  64
  65         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  66                 if (rdev->wiphy_idx == wiphy_idx) {
  67                         result = rdev;
  68                         break;
  69                 }
  70         }
  71
  72         return result;
  73 }
  74
  75 int get_wiphy_idx(struct wiphy *wiphy)
  76 {
  77         struct cfg80211_registered_device *rdev;
  78         if (!wiphy)
  79                 return WIPHY_IDX_STALE;
  80         rdev = wiphy_to_dev(wiphy);
  81         return rdev->wiphy_idx;
  82 }
  83
  84 /* requires cfg80211_rdev_mutex to be held! */
  85 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  86 {
  87         struct cfg80211_registered_device *rdev;
  88
  89         if (!wiphy_idx_valid(wiphy_idx))
  90                 return NULL;
  91
  92         assert_cfg80211_lock();
  93
  94         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  95         if (!rdev)
  96                 return NULL;
  97         return &rdev->wiphy;
  98 }
  99
 100 struct cfg80211_registered_device *
 101 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
 102 {
 103         struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
 104         struct net_device *dev;
 105
 106         mutex_lock(&cfg80211_mutex);
 107         dev = dev_get_by_index(net, ifindex);
 108         if (!dev)
 109                 goto out;
 110         if (dev->ieee80211_ptr) {
 111                 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 112                 mutex_lock(&rdev->mtx);
 113         } else
 114                 rdev = ERR_PTR(-ENODEV);
 115         dev_put(dev);
 116  out:
 117         mutex_unlock(&cfg80211_mutex);
 118         return rdev;
 119 }
 120
 121 /* requires cfg80211_mutex to be held */
 122 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 123                         char *newname)
 124 {
 125         struct cfg80211_registered_device *rdev2;
 126         int wiphy_idx, taken = -1, result, digits;
 127
 128         assert_cfg80211_lock();
 129
 130         /* prohibit calling the thing phy%d when %d is not its number */
 131         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 132         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 133                 /* count number of places needed to print wiphy_idx */
 134                 digits = 1;
 135                 while (wiphy_idx /= 10)
 136                         digits++;
 137                 /*
 138                  * deny the name if it is phy<idx> where <idx> is printed
 139                  * without leading zeroes. taken == strlen(newname) here
 140                  */
 141                 if (taken == strlen(PHY_NAME) + digits)
 142                         return -EINVAL;
 143         }
 144
 145
 146         /* Ignore nop renames */
 147         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
 148                 return 0;
 149
 150         /* Ensure another device does not already have this name. */
 151         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 152                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
 153                         return -EINVAL;
 154
 155         result = device_rename(&rdev->wiphy.dev, newname);
 156         if (result)
 157                 return result;
 158
 159         if (rdev->wiphy.debugfsdir &&
 160             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 161                             rdev->wiphy.debugfsdir,
 162                             rdev->wiphy.debugfsdir->d_parent,
 163                             newname))
 164                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 165
 166         nl80211_notify_dev_rename(rdev);
 167
 168         return 0;
 169 }
 170
 171 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 172                           struct net *net)
 173 {
 174         struct wireless_dev *wdev;
 175         int err = 0;
 176
 177         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 178                 return -EOPNOTSUPP;
 179
 180         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 181                 if (!wdev->netdev)
 182                         continue;
 183                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 184                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 185                 if (err)
 186                         break;
 187                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 188         }
 189
 190         if (err) {
 191                 /* failed -- clean up to old netns */
 192                 net = wiphy_net(&rdev->wiphy);
 193
 194                 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,
 195                                                      list) {
 196                         if (!wdev->netdev)
 197                                 continue;
 198                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 199                         err = dev_change_net_namespace(wdev->netdev, net,
 200                                                         "wlan%d");
 201                         WARN_ON(err);
 202                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 203                 }
 204
 205                 return err;
 206         }
 207
 208         wiphy_net_set(&rdev->wiphy, net);
 209
 210         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 211         WARN_ON(err);
 212
 213         return 0;
 214 }
 215
 216 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 217 {
 218         struct cfg80211_registered_device *rdev = data;
 219
 220         rdev_rfkill_poll(rdev);
 221 }
 222
 223 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 224 {
 225         struct cfg80211_registered_device *rdev = data;
 226         struct wireless_dev *wdev;
 227
 228         if (!blocked)
 229                 return 0;
 230
 231         rtnl_lock();
 232         mutex_lock(&rdev->devlist_mtx);
 233
 234         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 235                 if (wdev->netdev) {
 236                         dev_close(wdev->netdev);
 237                         continue;
 238                 }
 239                 /* otherwise, check iftype */
 240                 switch (wdev->iftype) {
 241                 case NL80211_IFTYPE_P2P_DEVICE:
 242                         if (!wdev->p2p_started)
 243                                 break;
 244                         rdev_stop_p2p_device(rdev, wdev);
 245                         wdev->p2p_started = false;
 246                         rdev->opencount--;
 247                         break;
 248                 default:
 249                         break;
 250                 }
 251         }
 252
 253         mutex_unlock(&rdev->devlist_mtx);
 254         rtnl_unlock();
 255
 256         return 0;
 257 }
 258
 259 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 260 {
 261         struct cfg80211_registered_device *rdev;
 262
 263         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 264         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 265 }
 266
 267 static void cfg80211_event_work(struct work_struct *work)
 268 {
 269         struct cfg80211_registered_device *rdev;
 270
 271         rdev = container_of(work, struct cfg80211_registered_device,
 272                             event_work);
 273
 274         rtnl_lock();
 275         cfg80211_lock_rdev(rdev);
 276
 277         cfg80211_process_rdev_events(rdev);
 278         cfg80211_unlock_rdev(rdev);
 279         rtnl_unlock();
 280 }
 281
 282 /* exported functions */
 283
 284 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 285 {
 286         static int wiphy_counter;
 287
 288         struct cfg80211_registered_device *rdev;
 289         int alloc_size;
 290
 291         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 292         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 293         WARN_ON(ops->connect && !ops->disconnect);
 294         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 295         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 296         WARN_ON(ops->add_station && !ops->del_station);
 297         WARN_ON(ops->add_mpath && !ops->del_mpath);
 298         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 299
 300         alloc_size = sizeof(*rdev) + sizeof_priv;
 301
 302         rdev = kzalloc(alloc_size, GFP_KERNEL);
 303         if (!rdev)
 304                 return NULL;
 305
 306         rdev->ops = ops;
 307
 308         mutex_lock(&cfg80211_mutex);
 309
 310         rdev->wiphy_idx = wiphy_counter++;
 311
 312         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
 313                 wiphy_counter--;
 314                 mutex_unlock(&cfg80211_mutex);
 315                 /* ugh, wrapped! */
 316                 kfree(rdev);
 317                 return NULL;
 318         }
 319
 320         mutex_unlock(&cfg80211_mutex);
 321
 322         /* give it a proper name */
 323         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 324
 325         mutex_init(&rdev->mtx);
 326         mutex_init(&rdev->devlist_mtx);
 327         mutex_init(&rdev->sched_scan_mtx);
 328         INIT_LIST_HEAD(&rdev->wdev_list);
 329         INIT_LIST_HEAD(&rdev->beacon_registrations);
 330         spin_lock_init(&rdev->beacon_registrations_lock);
 331         spin_lock_init(&rdev->bss_lock);
 332         INIT_LIST_HEAD(&rdev->bss_list);
 333         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 334         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 335 #ifdef CONFIG_CFG80211_WEXT
 336         rdev->wiphy.wext = &cfg80211_wext_handler;
 337 #endif
 338
 339         device_initialize(&rdev->wiphy.dev);
 340         rdev->wiphy.dev.class = &ieee80211_class;
 341         rdev->wiphy.dev.platform_data = rdev;
 342
 343 #ifdef CONFIG_CFG80211_DEFAULT_PS
 344         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 345 #endif
 346
 347         wiphy_net_set(&rdev->wiphy, &init_net);
 348
 349         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 350         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 351                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 352                                    &rdev->rfkill_ops, rdev);
 353
 354         if (!rdev->rfkill) {
 355                 kfree(rdev);
 356                 return NULL;
 357         }
 358
 359         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 360         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 361         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 362
 363         init_waitqueue_head(&rdev->dev_wait);
 364
 365         /*
 366          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 367          * Fragmentation and RTS threshold are disabled by default with the
 368          * special -1 value.
 369          */
 370         rdev->wiphy.retry_short = 7;
 371         rdev->wiphy.retry_long = 4;
 372         rdev->wiphy.frag_threshold = (u32) -1;
 373         rdev->wiphy.rts_threshold = (u32) -1;
 374         rdev->wiphy.coverage_class = 0;
 375
 376         rdev->wiphy.features = NL80211_FEATURE_SCAN_FLUSH;
 377
 378         return &rdev->wiphy;
 379 }
 380 EXPORT_SYMBOL(wiphy_new);
 381
 382 static int wiphy_verify_combinations(struct wiphy *wiphy)
 383 {
 384         const struct ieee80211_iface_combination *c;
 385         int i, j;
 386
 387         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 388                 u32 cnt = 0;
 389                 u16 all_iftypes = 0;
 390
 391                 c = &wiphy->iface_combinations[i];
 392
 393                 /* Combinations with just one interface aren't real */
 394                 if (WARN_ON(c->max_interfaces < 2))
 395                         return -EINVAL;
 396
 397                 /* Need at least one channel */
 398                 if (WARN_ON(!c->num_different_channels))
 399                         return -EINVAL;
 400
 401                 /*
 402                  * Put a sane limit on maximum number of different
 403                  * channels to simplify channel accounting code.
 404                  */
 405                 if (WARN_ON(c->num_different_channels >
 406                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 407                         return -EINVAL;
 408
 409                 if (WARN_ON(!c->n_limits))
 410                         return -EINVAL;
 411
 412                 for (j = 0; j < c->n_limits; j++) {
 413                         u16 types = c->limits[j].types;
 414
 415                         /*
 416                          * interface types shouldn't overlap, this is
 417                          * used in cfg80211_can_change_interface()
 418                          */
 419                         if (WARN_ON(types & all_iftypes))
 420                                 return -EINVAL;
 421                         all_iftypes |= types;
 422
 423                         if (WARN_ON(!c->limits[j].max))
 424                                 return -EINVAL;
 425
 426                         /* Shouldn't list software iftypes in combinations! */
 427                         if (WARN_ON(wiphy->software_iftypes & types))
 428                                 return -EINVAL;
 429
 430                         /* Only a single P2P_DEVICE can be allowed */
 431                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 432                                     c->limits[j].max > 1))
 433                                 return -EINVAL;
 434
 435                         cnt += c->limits[j].max;
 436                         /*
 437                          * Don't advertise an unsupported type
 438                          * in a combination.
 439                          */
 440                         if (WARN_ON((wiphy->interface_modes & types) != types))
 441                                 return -EINVAL;
 442                 }
 443
 444                 /* You can't even choose that many! */
 445                 if (WARN_ON(cnt < c->max_interfaces))
 446                         return -EINVAL;
 447         }
 448
 449         return 0;
 450 }
 451
 452 int wiphy_register(struct wiphy *wiphy)
 453 {
 454         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 455         int res;
 456         enum ieee80211_band band;
 457         struct ieee80211_supported_band *sband;
 458         bool have_band = false;
 459         int i;
 460         u16 ifmodes = wiphy->interface_modes;
 461
 462 #ifdef CONFIG_PM
 463         if (WARN_ON((wiphy->wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 464                     !(wiphy->wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 465                 return -EINVAL;
 466 #endif
 467
 468         if (WARN_ON(wiphy->ap_sme_capa &&
 469                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 470                 return -EINVAL;
 471
 472         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 473                 return -EINVAL;
 474
 475         if (WARN_ON(wiphy->addresses &&
 476                     !is_zero_ether_addr(wiphy->perm_addr) &&
 477                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 478                            ETH_ALEN)))
 479                 return -EINVAL;
 480
 481         if (wiphy->addresses)
 482                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 483
 484         /* sanity check ifmodes */
 485         WARN_ON(!ifmodes);
 486         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 487         if (WARN_ON(ifmodes != wiphy->interface_modes))
 488                 wiphy->interface_modes = ifmodes;
 489
 490         res = wiphy_verify_combinations(wiphy);
 491         if (res)
 492                 return res;
 493
 494         /* sanity check supported bands/channels */
 495         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 496                 sband = wiphy->bands[band];
 497                 if (!sband)
 498                         continue;
 499
 500                 sband->band = band;
 501                 if (WARN_ON(!sband->n_channels))
 502                         return -EINVAL;
 503                 /*
 504                  * on 60gHz band, there are no legacy rates, so
 505                  * n_bitrates is 0
 506                  */
 507                 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
 508                             !sband->n_bitrates))
 509                         return -EINVAL;
 510
 511                 /*
 512                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 513                  * modify the sband's ht data even if the driver uses a
 514                  * global structure for that.
 515                  */
 516                 if (cfg80211_disable_40mhz_24ghz &&
 517                     band == IEEE80211_BAND_2GHZ &&
 518                     sband->ht_cap.ht_supported) {
 519                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 520                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 521                 }
 522
 523                 /*
 524                  * Since we use a u32 for rate bitmaps in
 525                  * ieee80211_get_response_rate, we cannot
 526                  * have more than 32 legacy rates.
 527                  */
 528                 if (WARN_ON(sband->n_bitrates > 32))
 529                         return -EINVAL;
 530
 531                 for (i = 0; i < sband->n_channels; i++) {
 532                         sband->channels[i].orig_flags =
 533                                 sband->channels[i].flags;
 534                         sband->channels[i].orig_mag = INT_MAX;
 535                         sband->channels[i].orig_mpwr =
 536                                 sband->channels[i].max_power;
 537                         sband->channels[i].band = band;
 538                 }
 539
 540                 have_band = true;
 541         }
 542
 543         if (!have_band) {
 544                 WARN_ON(1);
 545                 return -EINVAL;
 546         }
 547
 548 #ifdef CONFIG_PM
 549         if (rdev->wiphy.wowlan.n_patterns) {
 550                 if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len ||
 551                             rdev->wiphy.wowlan.pattern_min_len >
 552                             rdev->wiphy.wowlan.pattern_max_len))
 553                         return -EINVAL;
 554         }
 555 #endif
 556
 557         /* check and set up bitrates */
 558         ieee80211_set_bitrate_flags(wiphy);
 559
 560         mutex_lock(&cfg80211_mutex);
 561
 562         res = device_add(&rdev->wiphy.dev);
 563         if (res) {
 564                 mutex_unlock(&cfg80211_mutex);
 565                 return res;
 566         }
 567
 568         /* set up regulatory info */
 569         wiphy_regulatory_register(wiphy);
 570
 571         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 572         cfg80211_rdev_list_generation++;
 573
 574         /* add to debugfs */
 575         rdev->wiphy.debugfsdir =
 576                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 577                                    ieee80211_debugfs_dir);
 578         if (IS_ERR(rdev->wiphy.debugfsdir))
 579                 rdev->wiphy.debugfsdir = NULL;
 580
 581         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
 582                 struct regulatory_request request;
 583
 584                 request.wiphy_idx = get_wiphy_idx(wiphy);
 585                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 586                 request.alpha2[0] = '9';
 587                 request.alpha2[1] = '9';
 588
 589                 nl80211_send_reg_change_event(&request);
 590         }
 591
 592         cfg80211_debugfs_rdev_add(rdev);
 593         mutex_unlock(&cfg80211_mutex);
 594
 595         /*
 596          * due to a locking dependency this has to be outside of the
 597          * cfg80211_mutex lock
 598          */
 599         res = rfkill_register(rdev->rfkill);
 600         if (res)
 601                 goto out_rm_dev;
 602
 603         rtnl_lock();
 604         rdev->wiphy.registered = true;
 605         rtnl_unlock();
 606         return 0;
 607
 608 out_rm_dev:
 609         device_del(&rdev->wiphy.dev);
 610         return res;
 611 }
 612 EXPORT_SYMBOL(wiphy_register);
 613
 614 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 615 {
 616         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 617
 618         if (!rdev->ops->rfkill_poll)
 619                 return;
 620         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 621         rfkill_resume_polling(rdev->rfkill);
 622 }
 623 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 624
 625 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 626 {
 627         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 628
 629         rfkill_pause_polling(rdev->rfkill);
 630 }
 631 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 632
 633 void wiphy_unregister(struct wiphy *wiphy)
 634 {
 635         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 636
 637         rtnl_lock();
 638         rdev->wiphy.registered = false;
 639         rtnl_unlock();
 640
 641         rfkill_unregister(rdev->rfkill);
 642
 643         /* protect the device list */
 644         mutex_lock(&cfg80211_mutex);
 645
 646         wait_event(rdev->dev_wait, ({
 647                 int __count;
 648                 mutex_lock(&rdev->devlist_mtx);
 649                 __count = rdev->opencount;
 650                 mutex_unlock(&rdev->devlist_mtx);
 651                 __count == 0; }));
 652
 653         mutex_lock(&rdev->devlist_mtx);
 654         BUG_ON(!list_empty(&rdev->wdev_list));
 655         mutex_unlock(&rdev->devlist_mtx);
 656
 657         /*
 658          * First remove the hardware from everywhere, this makes
 659          * it impossible to find from userspace.
 660          */
 661         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 662         list_del_rcu(&rdev->list);
 663         synchronize_rcu();
 664
 665         /*
 666          * Try to grab rdev->mtx. If a command is still in progress,
 667          * hopefully the driver will refuse it since it's tearing
 668          * down the device already. We wait for this command to complete
 669          * before unlinking the item from the list.
 670          * Note: as codified by the BUG_ON above we cannot get here if
 671          * a virtual interface is still present. Hence, we can only get
 672          * to lock contention here if userspace issues a command that
 673          * identified the hardware by wiphy index.
 674          */
 675         cfg80211_lock_rdev(rdev);
 676         /* nothing */
 677         cfg80211_unlock_rdev(rdev);
 678
 679         /*
 680          * If this device got a regulatory hint tell core its
 681          * free to listen now to a new shiny device regulatory hint
 682          */
 683         wiphy_regulatory_deregister(wiphy);
 684
 685         cfg80211_rdev_list_generation++;
 686         device_del(&rdev->wiphy.dev);
 687
 688         mutex_unlock(&cfg80211_mutex);
 689
 690         flush_work(&rdev->scan_done_wk);
 691         cancel_work_sync(&rdev->conn_work);
 692         flush_work(&rdev->event_work);
 693
 694         if (rdev->wowlan && rdev->ops->set_wakeup)
 695                 rdev_set_wakeup(rdev, false);
 696         cfg80211_rdev_free_wowlan(rdev);
 697 }
 698 EXPORT_SYMBOL(wiphy_unregister);
 699
 700 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 701 {
 702         struct cfg80211_internal_bss *scan, *tmp;
 703         struct cfg80211_beacon_registration *reg, *treg;
 704         rfkill_destroy(rdev->rfkill);
 705         mutex_destroy(&rdev->mtx);
 706         mutex_destroy(&rdev->devlist_mtx);
 707         mutex_destroy(&rdev->sched_scan_mtx);
 708         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 709                 list_del(&reg->list);
 710                 kfree(reg);
 711         }
 712         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 713                 cfg80211_put_bss(&scan->pub);
 714         kfree(rdev);
 715 }
 716
 717 void wiphy_free(struct wiphy *wiphy)
 718 {
 719         put_device(&wiphy->dev);
 720 }
 721 EXPORT_SYMBOL(wiphy_free);
 722
 723 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 724 {
 725         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 726
 727         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 728                 schedule_work(&rdev->rfkill_sync);
 729 }
 730 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 731
 732 static void wdev_cleanup_work(struct work_struct *work)
 733 {
 734         struct wireless_dev *wdev;
 735         struct cfg80211_registered_device *rdev;
 736
 737         wdev = container_of(work, struct wireless_dev, cleanup_work);
 738         rdev = wiphy_to_dev(wdev->wiphy);
 739
 740         cfg80211_lock_rdev(rdev);
 741
 742         if (WARN_ON(rdev->scan_req && rdev->scan_req->wdev == wdev)) {
 743                 rdev->scan_req->aborted = true;
 744                 ___cfg80211_scan_done(rdev, true);
 745         }
 746
 747         cfg80211_unlock_rdev(rdev);
 748
 749         mutex_lock(&rdev->sched_scan_mtx);
 750
 751         if (WARN_ON(rdev->sched_scan_req &&
 752                     rdev->sched_scan_req->dev == wdev->netdev)) {
 753                 __cfg80211_stop_sched_scan(rdev, false);
 754         }
 755
 756         mutex_unlock(&rdev->sched_scan_mtx);
 757
 758         mutex_lock(&rdev->devlist_mtx);
 759         rdev->opencount--;
 760         mutex_unlock(&rdev->devlist_mtx);
 761         wake_up(&rdev->dev_wait);
 762
 763         dev_put(wdev->netdev);
 764 }
 765
 766 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 767 {
 768         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 769
 770         ASSERT_RTNL();
 771
 772         if (WARN_ON(wdev->netdev))
 773                 return;
 774
 775         mutex_lock(&rdev->devlist_mtx);
 776         list_del_rcu(&wdev->list);
 777         rdev->devlist_generation++;
 778
 779         switch (wdev->iftype) {
 780         case NL80211_IFTYPE_P2P_DEVICE:
 781                 if (!wdev->p2p_started)
 782                         break;
 783                 rdev_stop_p2p_device(rdev, wdev);
 784                 wdev->p2p_started = false;
 785                 rdev->opencount--;
 786                 break;
 787         default:
 788                 WARN_ON_ONCE(1);
 789                 break;
 790         }
 791         mutex_unlock(&rdev->devlist_mtx);
 792 }
 793 EXPORT_SYMBOL(cfg80211_unregister_wdev);
 794
 795 static struct device_type wiphy_type = {
 796         .name   = "wlan",
 797 };
 798
 799 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 800                                enum nl80211_iftype iftype, int num)
 801 {
 802         ASSERT_RTNL();
 803
 804         rdev->num_running_ifaces += num;
 805         if (iftype == NL80211_IFTYPE_MONITOR)
 806                 rdev->num_running_monitor_ifaces += num;
 807 }
 808
 809 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 810                                          unsigned long state,
 811                                          void *ndev)
 812 {
 813         struct net_device *dev = ndev;
 814         struct wireless_dev *wdev = dev->ieee80211_ptr;
 815         struct cfg80211_registered_device *rdev;
 816         int ret;
 817
 818         if (!wdev)
 819                 return NOTIFY_DONE;
 820
 821         rdev = wiphy_to_dev(wdev->wiphy);
 822
 823         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 824
 825         switch (state) {
 826         case NETDEV_POST_INIT:
 827                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 828                 break;
 829         case NETDEV_REGISTER:
 830                 /*
 831                  * NB: cannot take rdev->mtx here because this may be
 832                  * called within code protected by it when interfaces
 833                  * are added with nl80211.
 834                  */
 835                 mutex_init(&wdev->mtx);
 836                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
 837                 INIT_LIST_HEAD(&wdev->event_list);
 838                 spin_lock_init(&wdev->event_lock);
 839                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
 840                 spin_lock_init(&wdev->mgmt_registrations_lock);
 841
 842                 mutex_lock(&rdev->devlist_mtx);
 843                 wdev->identifier = ++rdev->wdev_id;
 844                 list_add_rcu(&wdev->list, &rdev->wdev_list);
 845                 rdev->devlist_generation++;
 846                 /* can only change netns with wiphy */
 847                 dev->features |= NETIF_F_NETNS_LOCAL;
 848
 849                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 850                                       "phy80211")) {
 851                         pr_err("failed to add phy80211 symlink to netdev!\n");
 852                 }
 853                 wdev->netdev = dev;
 854                 wdev->sme_state = CFG80211_SME_IDLE;
 855                 mutex_unlock(&rdev->devlist_mtx);
 856 #ifdef CONFIG_CFG80211_WEXT
 857                 wdev->wext.default_key = -1;
 858                 wdev->wext.default_mgmt_key = -1;
 859                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 860 #endif
 861
 862                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
 863                         wdev->ps = true;
 864                 else
 865                         wdev->ps = false;
 866                 /* allow mac80211 to determine the timeout */
 867                 wdev->ps_timeout = -1;
 868
 869                 netdev_set_default_ethtool_ops(dev, &cfg80211_ethtool_ops);
 870
 871                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 872                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
 873                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
 874                         dev->priv_flags |= IFF_DONT_BRIDGE;
 875                 break;
 876         case NETDEV_GOING_DOWN:
 877                 switch (wdev->iftype) {
 878                 case NL80211_IFTYPE_ADHOC:
 879                         cfg80211_leave_ibss(rdev, dev, true);
 880                         break;
 881                 case NL80211_IFTYPE_P2P_CLIENT:
 882                 case NL80211_IFTYPE_STATION:
 883                         mutex_lock(&rdev->sched_scan_mtx);
 884                         __cfg80211_stop_sched_scan(rdev, false);
 885                         mutex_unlock(&rdev->sched_scan_mtx);
 886
 887                         wdev_lock(wdev);
 888 #ifdef CONFIG_CFG80211_WEXT
 889                         kfree(wdev->wext.ie);
 890                         wdev->wext.ie = NULL;
 891                         wdev->wext.ie_len = 0;
 892                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 893 #endif
 894                         __cfg80211_disconnect(rdev, dev,
 895                                               WLAN_REASON_DEAUTH_LEAVING, true);
 896                         cfg80211_mlme_down(rdev, dev);
 897                         wdev_unlock(wdev);
 898                         break;
 899                 case NL80211_IFTYPE_MESH_POINT:
 900                         cfg80211_leave_mesh(rdev, dev);
 901                         break;
 902                 case NL80211_IFTYPE_AP:
 903                         cfg80211_stop_ap(rdev, dev);
 904                         break;
 905                 default:
 906                         break;
 907                 }
 908                 wdev->beacon_interval = 0;
 909                 break;
 910         case NETDEV_DOWN:
 911                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
 912                 dev_hold(dev);
 913                 queue_work(cfg80211_wq, &wdev->cleanup_work);
 914                 break;
 915         case NETDEV_UP:
 916                 /*
 917                  * If we have a really quick DOWN/UP succession we may
 918                  * have this work still pending ... cancel it and see
 919                  * if it was pending, in which case we need to account
 920                  * for some of the work it would have done.
 921                  */
 922                 if (cancel_work_sync(&wdev->cleanup_work)) {
 923                         mutex_lock(&rdev->devlist_mtx);
 924                         rdev->opencount--;
 925                         mutex_unlock(&rdev->devlist_mtx);
 926                         dev_put(dev);
 927                 }
 928                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
 929                 cfg80211_lock_rdev(rdev);
 930                 mutex_lock(&rdev->devlist_mtx);
 931                 wdev_lock(wdev);
 932                 switch (wdev->iftype) {
 933 #ifdef CONFIG_CFG80211_WEXT
 934                 case NL80211_IFTYPE_ADHOC:
 935                         cfg80211_ibss_wext_join(rdev, wdev);
 936                         break;
 937                 case NL80211_IFTYPE_STATION:
 938                         cfg80211_mgd_wext_connect(rdev, wdev);
 939                         break;
 940 #endif
 941 #ifdef CONFIG_MAC80211_MESH
 942                 case NL80211_IFTYPE_MESH_POINT:
 943                         {
 944                                 /* backward compat code... */
 945                                 struct mesh_setup setup;
 946                                 memcpy(&setup, &default_mesh_setup,
 947                                                 sizeof(setup));
 948                                  /* back compat only needed for mesh_id */
 949                                 setup.mesh_id = wdev->ssid;
 950                                 setup.mesh_id_len = wdev->mesh_id_up_len;
 951                                 if (wdev->mesh_id_up_len)
 952                                         __cfg80211_join_mesh(rdev, dev,
 953                                                         &setup,
 954                                                         &default_mesh_config);
 955                                 break;
 956                         }
 957 #endif
 958                 default:
 959                         break;
 960                 }
 961                 wdev_unlock(wdev);
 962                 rdev->opencount++;
 963                 mutex_unlock(&rdev->devlist_mtx);
 964                 cfg80211_unlock_rdev(rdev);
 965
 966                 /*
 967                  * Configure power management to the driver here so that its
 968                  * correctly set also after interface type changes etc.
 969                  */
 970                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 971                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
 972                     rdev->ops->set_power_mgmt)
 973                         if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
 974                                                 wdev->ps_timeout)) {
 975                                 /* assume this means it's off */
 976                                 wdev->ps = false;
 977                         }
 978                 break;
 979         case NETDEV_UNREGISTER:
 980                 /*
 981                  * NB: cannot take rdev->mtx here because this may be
 982                  * called within code protected by it when interfaces
 983                  * are removed with nl80211.
 984                  */
 985                 mutex_lock(&rdev->devlist_mtx);
 986                 /*
 987                  * It is possible to get NETDEV_UNREGISTER
 988                  * multiple times. To detect that, check
 989                  * that the interface is still on the list
 990                  * of registered interfaces, and only then
 991                  * remove and clean it up.
 992                  */
 993                 if (!list_empty(&wdev->list)) {
 994                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 995                         list_del_rcu(&wdev->list);
 996                         rdev->devlist_generation++;
 997                         cfg80211_mlme_purge_registrations(wdev);
 998 #ifdef CONFIG_CFG80211_WEXT
 999                         kfree(wdev->wext.keys);
1000 #endif
1001                 }
1002                 mutex_unlock(&rdev->devlist_mtx);
1003                 /*
1004                  * synchronise (so that we won't find this netdev
1005                  * from other code any more) and then clear the list
1006                  * head so that the above code can safely check for
1007                  * !list_empty() to avoid double-cleanup.
1008                  */
1009                 synchronize_rcu();
1010                 INIT_LIST_HEAD(&wdev->list);
1011                 /*
1012                  * Ensure that all events have been processed and
1013                  * freed.
1014                  */
1015                 cfg80211_process_wdev_events(wdev);
1016                 break;
1017         case NETDEV_PRE_UP:
1018                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1019                         return notifier_from_errno(-EOPNOTSUPP);
1020                 if (rfkill_blocked(rdev->rfkill))
1021                         return notifier_from_errno(-ERFKILL);
1022                 mutex_lock(&rdev->devlist_mtx);
1023                 ret = cfg80211_can_add_interface(rdev, wdev->iftype);
1024                 mutex_unlock(&rdev->devlist_mtx);
1025                 if (ret)
1026                         return notifier_from_errno(ret);
1027                 break;
1028         }
1029
1030         return NOTIFY_DONE;
1031 }
1032
1033 static struct notifier_block cfg80211_netdev_notifier = {
1034         .notifier_call = cfg80211_netdev_notifier_call,
1035 };
1036
1037 static void __net_exit cfg80211_pernet_exit(struct net *net)
1038 {
1039         struct cfg80211_registered_device *rdev;
1040
1041         rtnl_lock();
1042         mutex_lock(&cfg80211_mutex);
1043         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1044                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1045                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1046         }
1047         mutex_unlock(&cfg80211_mutex);
1048         rtnl_unlock();
1049 }
1050
1051 static struct pernet_operations cfg80211_pernet_ops = {
1052         .exit = cfg80211_pernet_exit,
1053 };
1054
1055 static int __init cfg80211_init(void)
1056 {
1057         int err;
1058
1059         err = register_pernet_device(&cfg80211_pernet_ops);
1060         if (err)
1061                 goto out_fail_pernet;
1062
1063         err = wiphy_sysfs_init();
1064         if (err)
1065                 goto out_fail_sysfs;
1066
1067         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1068         if (err)
1069                 goto out_fail_notifier;
1070
1071         err = nl80211_init();
1072         if (err)
1073                 goto out_fail_nl80211;
1074
1075         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1076
1077         err = regulatory_init();
1078         if (err)
1079                 goto out_fail_reg;
1080
1081         cfg80211_wq = create_singlethread_workqueue("cfg80211");
1082         if (!cfg80211_wq)
1083                 goto out_fail_wq;
1084
1085         return 0;
1086
1087 out_fail_wq:
1088         regulatory_exit();
1089 out_fail_reg:
1090         debugfs_remove(ieee80211_debugfs_dir);
1091 out_fail_nl80211:
1092         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1093 out_fail_notifier:
1094         wiphy_sysfs_exit();
1095 out_fail_sysfs:
1096         unregister_pernet_device(&cfg80211_pernet_ops);
1097 out_fail_pernet:
1098         return err;
1099 }
1100 subsys_initcall(cfg80211_init);
1101
1102 static void __exit cfg80211_exit(void)
1103 {
1104         debugfs_remove(ieee80211_debugfs_dir);
1105         nl80211_exit();
1106         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1107         wiphy_sysfs_exit();
1108         regulatory_exit();
1109         unregister_pernet_device(&cfg80211_pernet_ops);
1110         destroy_workqueue(cfg80211_wq);
1111 }
1112 module_exit(cfg80211_exit);