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 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
  38
  39 /* RCU-protected (and RTNL for writers) */
  40 LIST_HEAD(cfg80211_rdev_list);
  41 int cfg80211_rdev_list_generation;
  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 static bool cfg80211_disable_40mhz_24ghz;
  50 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  51 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  52                  "Disable 40MHz support in the 2.4GHz band");
  53
  54 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  55 {
  56         struct cfg80211_registered_device *result = NULL, *rdev;
  57
  58         ASSERT_RTNL();
  59
  60         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  61                 if (rdev->wiphy_idx == wiphy_idx) {
  62                         result = rdev;
  63                         break;
  64                 }
  65         }
  66
  67         return result;
  68 }
  69
  70 int get_wiphy_idx(struct wiphy *wiphy)
  71 {
  72         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
  73
  74         return rdev->wiphy_idx;
  75 }
  76
  77 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  78 {
  79         struct cfg80211_registered_device *rdev;
  80
  81         ASSERT_RTNL();
  82
  83         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  84         if (!rdev)
  85                 return NULL;
  86         return &rdev->wiphy;
  87 }
  88
  89 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
  90                         char *newname)
  91 {
  92         struct cfg80211_registered_device *rdev2;
  93         int wiphy_idx, taken = -1, result, digits;
  94
  95         ASSERT_RTNL();
  96
  97         /* prohibit calling the thing phy%d when %d is not its number */
  98         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
  99         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 100                 /* count number of places needed to print wiphy_idx */
 101                 digits = 1;
 102                 while (wiphy_idx /= 10)
 103                         digits++;
 104                 /*
 105                  * deny the name if it is phy<idx> where <idx> is printed
 106                  * without leading zeroes. taken == strlen(newname) here
 107                  */
 108                 if (taken == strlen(PHY_NAME) + digits)
 109                         return -EINVAL;
 110         }
 111
 112
 113         /* Ignore nop renames */
 114         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
 115                 return 0;
 116
 117         /* Ensure another device does not already have this name. */
 118         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 119                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
 120                         return -EINVAL;
 121
 122         result = device_rename(&rdev->wiphy.dev, newname);
 123         if (result)
 124                 return result;
 125
 126         if (rdev->wiphy.debugfsdir &&
 127             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 128                             rdev->wiphy.debugfsdir,
 129                             rdev->wiphy.debugfsdir->d_parent,
 130                             newname))
 131                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 132
 133         nl80211_notify_dev_rename(rdev);
 134
 135         return 0;
 136 }
 137
 138 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 139                           struct net *net)
 140 {
 141         struct wireless_dev *wdev;
 142         int err = 0;
 143
 144         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 145                 return -EOPNOTSUPP;
 146
 147         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 148                 if (!wdev->netdev)
 149                         continue;
 150                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 151                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 152                 if (err)
 153                         break;
 154                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 155         }
 156
 157         if (err) {
 158                 /* failed -- clean up to old netns */
 159                 net = wiphy_net(&rdev->wiphy);
 160
 161                 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,
 162                                                      list) {
 163                         if (!wdev->netdev)
 164                                 continue;
 165                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 166                         err = dev_change_net_namespace(wdev->netdev, net,
 167                                                         "wlan%d");
 168                         WARN_ON(err);
 169                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 170                 }
 171
 172                 return err;
 173         }
 174
 175         wiphy_net_set(&rdev->wiphy, net);
 176
 177         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 178         WARN_ON(err);
 179
 180         return 0;
 181 }
 182
 183 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 184 {
 185         struct cfg80211_registered_device *rdev = data;
 186
 187         rdev_rfkill_poll(rdev);
 188 }
 189
 190 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 191                               struct wireless_dev *wdev)
 192 {
 193         ASSERT_RTNL();
 194
 195         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 196                 return;
 197
 198         if (!wdev->p2p_started)
 199                 return;
 200
 201         rdev_stop_p2p_device(rdev, wdev);
 202         wdev->p2p_started = false;
 203
 204         rdev->opencount--;
 205
 206         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 207                 bool busy = work_busy(&rdev->scan_done_wk);
 208
 209                 /*
 210                  * If the work isn't pending or running (in which case it would
 211                  * be waiting for the lock we hold) the driver didn't properly
 212                  * cancel the scan when the interface was removed. In this case
 213                  * warn and leak the scan request object to not crash later.
 214                  */
 215                 WARN_ON(!busy);
 216
 217                 rdev->scan_req->aborted = true;
 218                 ___cfg80211_scan_done(rdev, !busy);
 219         }
 220 }
 221
 222 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 223 {
 224         struct cfg80211_registered_device *rdev = data;
 225         struct wireless_dev *wdev;
 226
 227         if (!blocked)
 228                 return 0;
 229
 230         rtnl_lock();
 231
 232         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 233                 if (wdev->netdev) {
 234                         dev_close(wdev->netdev);
 235                         continue;
 236                 }
 237                 /* otherwise, check iftype */
 238                 switch (wdev->iftype) {
 239                 case NL80211_IFTYPE_P2P_DEVICE:
 240                         cfg80211_stop_p2p_device(rdev, wdev);
 241                         break;
 242                 default:
 243                         break;
 244                 }
 245         }
 246
 247         rtnl_unlock();
 248
 249         return 0;
 250 }
 251
 252 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 253 {
 254         struct cfg80211_registered_device *rdev;
 255
 256         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 257         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 258 }
 259
 260 static void cfg80211_event_work(struct work_struct *work)
 261 {
 262         struct cfg80211_registered_device *rdev;
 263
 264         rdev = container_of(work, struct cfg80211_registered_device,
 265                             event_work);
 266
 267         rtnl_lock();
 268         cfg80211_process_rdev_events(rdev);
 269         rtnl_unlock();
 270 }
 271
 272 /* exported functions */
 273
 274 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 275 {
 276         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 277
 278         struct cfg80211_registered_device *rdev;
 279         int alloc_size;
 280
 281         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 282         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 283         WARN_ON(ops->connect && !ops->disconnect);
 284         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 285         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 286         WARN_ON(ops->add_station && !ops->del_station);
 287         WARN_ON(ops->add_mpath && !ops->del_mpath);
 288         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 289
 290         alloc_size = sizeof(*rdev) + sizeof_priv;
 291
 292         rdev = kzalloc(alloc_size, GFP_KERNEL);
 293         if (!rdev)
 294                 return NULL;
 295
 296         rdev->ops = ops;
 297
 298         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 299
 300         if (unlikely(rdev->wiphy_idx < 0)) {
 301                 /* ugh, wrapped! */
 302                 atomic_dec(&wiphy_counter);
 303                 kfree(rdev);
 304                 return NULL;
 305         }
 306
 307         /* give it a proper name */
 308         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 309
 310         INIT_LIST_HEAD(&rdev->wdev_list);
 311         INIT_LIST_HEAD(&rdev->beacon_registrations);
 312         spin_lock_init(&rdev->beacon_registrations_lock);
 313         spin_lock_init(&rdev->bss_lock);
 314         INIT_LIST_HEAD(&rdev->bss_list);
 315         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 316         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 317         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 318                           cfg80211_dfs_channels_update_work);
 319 #ifdef CONFIG_CFG80211_WEXT
 320         rdev->wiphy.wext = &cfg80211_wext_handler;
 321 #endif
 322
 323         device_initialize(&rdev->wiphy.dev);
 324         rdev->wiphy.dev.class = &ieee80211_class;
 325         rdev->wiphy.dev.platform_data = rdev;
 326
 327 #ifdef CONFIG_CFG80211_DEFAULT_PS
 328         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 329 #endif
 330
 331         wiphy_net_set(&rdev->wiphy, &init_net);
 332
 333         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 334         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 335                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 336                                    &rdev->rfkill_ops, rdev);
 337
 338         if (!rdev->rfkill) {
 339                 kfree(rdev);
 340                 return NULL;
 341         }
 342
 343         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 344         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 345         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 346
 347         init_waitqueue_head(&rdev->dev_wait);
 348
 349         /*
 350          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 351          * Fragmentation and RTS threshold are disabled by default with the
 352          * special -1 value.
 353          */
 354         rdev->wiphy.retry_short = 7;
 355         rdev->wiphy.retry_long = 4;
 356         rdev->wiphy.frag_threshold = (u32) -1;
 357         rdev->wiphy.rts_threshold = (u32) -1;
 358         rdev->wiphy.coverage_class = 0;
 359
 360         rdev->wiphy.features = NL80211_FEATURE_SCAN_FLUSH;
 361
 362         return &rdev->wiphy;
 363 }
 364 EXPORT_SYMBOL(wiphy_new);
 365
 366 static int wiphy_verify_combinations(struct wiphy *wiphy)
 367 {
 368         const struct ieee80211_iface_combination *c;
 369         int i, j;
 370
 371         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 372                 u32 cnt = 0;
 373                 u16 all_iftypes = 0;
 374
 375                 c = &wiphy->iface_combinations[i];
 376
 377                 /*
 378                  * Combinations with just one interface aren't real,
 379                  * however we make an exception for DFS.
 380                  */
 381                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 382                         return -EINVAL;
 383
 384                 /* Need at least one channel */
 385                 if (WARN_ON(!c->num_different_channels))
 386                         return -EINVAL;
 387
 388                 /*
 389                  * Put a sane limit on maximum number of different
 390                  * channels to simplify channel accounting code.
 391                  */
 392                 if (WARN_ON(c->num_different_channels >
 393                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 394                         return -EINVAL;
 395
 396                 /* DFS only works on one channel. */
 397                 if (WARN_ON(c->radar_detect_widths &&
 398                             (c->num_different_channels > 1)))
 399                         return -EINVAL;
 400
 401                 if (WARN_ON(!c->n_limits))
 402                         return -EINVAL;
 403
 404                 for (j = 0; j < c->n_limits; j++) {
 405                         u16 types = c->limits[j].types;
 406
 407                         /*
 408                          * interface types shouldn't overlap, this is
 409                          * used in cfg80211_can_change_interface()
 410                          */
 411                         if (WARN_ON(types & all_iftypes))
 412                                 return -EINVAL;
 413                         all_iftypes |= types;
 414
 415                         if (WARN_ON(!c->limits[j].max))
 416                                 return -EINVAL;
 417
 418                         /* Shouldn't list software iftypes in combinations! */
 419                         if (WARN_ON(wiphy->software_iftypes & types))
 420                                 return -EINVAL;
 421
 422                         /* Only a single P2P_DEVICE can be allowed */
 423                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 424                                     c->limits[j].max > 1))
 425                                 return -EINVAL;
 426
 427                         cnt += c->limits[j].max;
 428                         /*
 429                          * Don't advertise an unsupported type
 430                          * in a combination.
 431                          */
 432                         if (WARN_ON((wiphy->interface_modes & types) != types))
 433                                 return -EINVAL;
 434                 }
 435
 436                 /* You can't even choose that many! */
 437                 if (WARN_ON(cnt < c->max_interfaces))
 438                         return -EINVAL;
 439         }
 440
 441         return 0;
 442 }
 443
 444 int wiphy_register(struct wiphy *wiphy)
 445 {
 446         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 447         int res;
 448         enum ieee80211_band band;
 449         struct ieee80211_supported_band *sband;
 450         bool have_band = false;
 451         int i;
 452         u16 ifmodes = wiphy->interface_modes;
 453
 454 #ifdef CONFIG_PM
 455         if (WARN_ON((wiphy->wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 456                     !(wiphy->wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 457                 return -EINVAL;
 458 #endif
 459
 460         if (WARN_ON(wiphy->ap_sme_capa &&
 461                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 462                 return -EINVAL;
 463
 464         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 465                 return -EINVAL;
 466
 467         if (WARN_ON(wiphy->addresses &&
 468                     !is_zero_ether_addr(wiphy->perm_addr) &&
 469                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 470                            ETH_ALEN)))
 471                 return -EINVAL;
 472
 473         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 474                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 475                      !rdev->ops->set_mac_acl)))
 476                 return -EINVAL;
 477
 478         if (wiphy->addresses)
 479                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 480
 481         /* sanity check ifmodes */
 482         WARN_ON(!ifmodes);
 483         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 484         if (WARN_ON(ifmodes != wiphy->interface_modes))
 485                 wiphy->interface_modes = ifmodes;
 486
 487         res = wiphy_verify_combinations(wiphy);
 488         if (res)
 489                 return res;
 490
 491         /* sanity check supported bands/channels */
 492         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 493                 sband = wiphy->bands[band];
 494                 if (!sband)
 495                         continue;
 496
 497                 sband->band = band;
 498                 if (WARN_ON(!sband->n_channels))
 499                         return -EINVAL;
 500                 /*
 501                  * on 60gHz band, there are no legacy rates, so
 502                  * n_bitrates is 0
 503                  */
 504                 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
 505                             !sband->n_bitrates))
 506                         return -EINVAL;
 507
 508                 /*
 509                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 510                  * modify the sband's ht data even if the driver uses a
 511                  * global structure for that.
 512                  */
 513                 if (cfg80211_disable_40mhz_24ghz &&
 514                     band == IEEE80211_BAND_2GHZ &&
 515                     sband->ht_cap.ht_supported) {
 516                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 517                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 518                 }
 519
 520                 /*
 521                  * Since we use a u32 for rate bitmaps in
 522                  * ieee80211_get_response_rate, we cannot
 523                  * have more than 32 legacy rates.
 524                  */
 525                 if (WARN_ON(sband->n_bitrates > 32))
 526                         return -EINVAL;
 527
 528                 for (i = 0; i < sband->n_channels; i++) {
 529                         sband->channels[i].orig_flags =
 530                                 sband->channels[i].flags;
 531                         sband->channels[i].orig_mag = INT_MAX;
 532                         sband->channels[i].orig_mpwr =
 533                                 sband->channels[i].max_power;
 534                         sband->channels[i].band = band;
 535                 }
 536
 537                 have_band = true;
 538         }
 539
 540         if (!have_band) {
 541                 WARN_ON(1);
 542                 return -EINVAL;
 543         }
 544
 545 #ifdef CONFIG_PM
 546         if (rdev->wiphy.wowlan.n_patterns) {
 547                 if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len ||
 548                             rdev->wiphy.wowlan.pattern_min_len >
 549                             rdev->wiphy.wowlan.pattern_max_len))
 550                         return -EINVAL;
 551         }
 552 #endif
 553
 554         /* check and set up bitrates */
 555         ieee80211_set_bitrate_flags(wiphy);
 556
 557         rtnl_lock();
 558
 559         res = device_add(&rdev->wiphy.dev);
 560         if (res) {
 561                 rtnl_unlock();
 562                 return res;
 563         }
 564
 565         /* set up regulatory info */
 566         wiphy_regulatory_register(wiphy);
 567
 568         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 569         cfg80211_rdev_list_generation++;
 570
 571         /* add to debugfs */
 572         rdev->wiphy.debugfsdir =
 573                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 574                                    ieee80211_debugfs_dir);
 575         if (IS_ERR(rdev->wiphy.debugfsdir))
 576                 rdev->wiphy.debugfsdir = NULL;
 577
 578         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
 579                 struct regulatory_request request;
 580
 581                 request.wiphy_idx = get_wiphy_idx(wiphy);
 582                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 583                 request.alpha2[0] = '9';
 584                 request.alpha2[1] = '9';
 585
 586                 nl80211_send_reg_change_event(&request);
 587         }
 588
 589         cfg80211_debugfs_rdev_add(rdev);
 590
 591         res = rfkill_register(rdev->rfkill);
 592         if (res) {
 593                 device_del(&rdev->wiphy.dev);
 594
 595                 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 596                 list_del_rcu(&rdev->list);
 597                 wiphy_regulatory_deregister(wiphy);
 598                 rtnl_unlock();
 599                 return res;
 600         }
 601
 602         rdev->wiphy.registered = true;
 603         rtnl_unlock();
 604         return 0;
 605 }
 606 EXPORT_SYMBOL(wiphy_register);
 607
 608 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 609 {
 610         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 611
 612         if (!rdev->ops->rfkill_poll)
 613                 return;
 614         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 615         rfkill_resume_polling(rdev->rfkill);
 616 }
 617 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 618
 619 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 620 {
 621         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 622
 623         rfkill_pause_polling(rdev->rfkill);
 624 }
 625 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 626
 627 void wiphy_unregister(struct wiphy *wiphy)
 628 {
 629         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 630
 631         wait_event(rdev->dev_wait, ({
 632                 int __count;
 633                 rtnl_lock();
 634                 __count = rdev->opencount;
 635                 rtnl_unlock();
 636                 __count == 0; }));
 637
 638         rtnl_lock();
 639         rdev->wiphy.registered = false;
 640
 641         rfkill_unregister(rdev->rfkill);
 642
 643         BUG_ON(!list_empty(&rdev->wdev_list));
 644
 645         /*
 646          * First remove the hardware from everywhere, this makes
 647          * it impossible to find from userspace.
 648          */
 649         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 650         list_del_rcu(&rdev->list);
 651         synchronize_rcu();
 652
 653         /*
 654          * If this device got a regulatory hint tell core its
 655          * free to listen now to a new shiny device regulatory hint
 656          */
 657         wiphy_regulatory_deregister(wiphy);
 658
 659         cfg80211_rdev_list_generation++;
 660         device_del(&rdev->wiphy.dev);
 661
 662         rtnl_unlock();
 663
 664         flush_work(&rdev->scan_done_wk);
 665         cancel_work_sync(&rdev->conn_work);
 666         flush_work(&rdev->event_work);
 667         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 668
 669         if (rdev->wowlan && rdev->ops->set_wakeup)
 670                 rdev_set_wakeup(rdev, false);
 671         cfg80211_rdev_free_wowlan(rdev);
 672 }
 673 EXPORT_SYMBOL(wiphy_unregister);
 674
 675 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 676 {
 677         struct cfg80211_internal_bss *scan, *tmp;
 678         struct cfg80211_beacon_registration *reg, *treg;
 679         rfkill_destroy(rdev->rfkill);
 680         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 681                 list_del(&reg->list);
 682                 kfree(reg);
 683         }
 684         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 685                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 686         kfree(rdev);
 687 }
 688
 689 void wiphy_free(struct wiphy *wiphy)
 690 {
 691         put_device(&wiphy->dev);
 692 }
 693 EXPORT_SYMBOL(wiphy_free);
 694
 695 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 696 {
 697         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 698
 699         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 700                 schedule_work(&rdev->rfkill_sync);
 701 }
 702 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 703
 704 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 705 {
 706         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 707
 708         ASSERT_RTNL();
 709
 710         if (WARN_ON(wdev->netdev))
 711                 return;
 712
 713         list_del_rcu(&wdev->list);
 714         rdev->devlist_generation++;
 715
 716         switch (wdev->iftype) {
 717         case NL80211_IFTYPE_P2P_DEVICE:
 718                 cfg80211_stop_p2p_device(rdev, wdev);
 719                 break;
 720         default:
 721                 WARN_ON_ONCE(1);
 722                 break;
 723         }
 724 }
 725 EXPORT_SYMBOL(cfg80211_unregister_wdev);
 726
 727 static struct device_type wiphy_type = {
 728         .name   = "wlan",
 729 };
 730
 731 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 732                                enum nl80211_iftype iftype, int num)
 733 {
 734         ASSERT_RTNL();
 735
 736         rdev->num_running_ifaces += num;
 737         if (iftype == NL80211_IFTYPE_MONITOR)
 738                 rdev->num_running_monitor_ifaces += num;
 739 }
 740
 741 void cfg80211_leave(struct cfg80211_registered_device *rdev,
 742                     struct wireless_dev *wdev)
 743 {
 744         struct net_device *dev = wdev->netdev;
 745
 746         switch (wdev->iftype) {
 747         case NL80211_IFTYPE_ADHOC:
 748                 cfg80211_leave_ibss(rdev, dev, true);
 749                 break;
 750         case NL80211_IFTYPE_P2P_CLIENT:
 751         case NL80211_IFTYPE_STATION:
 752                 __cfg80211_stop_sched_scan(rdev, false);
 753
 754                 wdev_lock(wdev);
 755 #ifdef CONFIG_CFG80211_WEXT
 756                 kfree(wdev->wext.ie);
 757                 wdev->wext.ie = NULL;
 758                 wdev->wext.ie_len = 0;
 759                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 760 #endif
 761                 __cfg80211_disconnect(rdev, dev,
 762                                       WLAN_REASON_DEAUTH_LEAVING, true);
 763                 wdev_unlock(wdev);
 764                 break;
 765         case NL80211_IFTYPE_MESH_POINT:
 766                 cfg80211_leave_mesh(rdev, dev);
 767                 break;
 768         case NL80211_IFTYPE_AP:
 769                 cfg80211_stop_ap(rdev, dev);
 770                 break;
 771         default:
 772                 break;
 773         }
 774
 775         wdev->beacon_interval = 0;
 776 }
 777
 778 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 779                                          unsigned long state,
 780                                          void *ndev)
 781 {
 782         struct net_device *dev = ndev;
 783         struct wireless_dev *wdev = dev->ieee80211_ptr;
 784         struct cfg80211_registered_device *rdev;
 785         int ret;
 786
 787         if (!wdev)
 788                 return NOTIFY_DONE;
 789
 790         rdev = wiphy_to_dev(wdev->wiphy);
 791
 792         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 793
 794         switch (state) {
 795         case NETDEV_POST_INIT:
 796                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 797                 break;
 798         case NETDEV_REGISTER:
 799                 /*
 800                  * NB: cannot take rdev->mtx here because this may be
 801                  * called within code protected by it when interfaces
 802                  * are added with nl80211.
 803                  */
 804                 mutex_init(&wdev->mtx);
 805                 INIT_LIST_HEAD(&wdev->event_list);
 806                 spin_lock_init(&wdev->event_lock);
 807                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
 808                 spin_lock_init(&wdev->mgmt_registrations_lock);
 809
 810                 wdev->identifier = ++rdev->wdev_id;
 811                 list_add_rcu(&wdev->list, &rdev->wdev_list);
 812                 rdev->devlist_generation++;
 813                 /* can only change netns with wiphy */
 814                 dev->features |= NETIF_F_NETNS_LOCAL;
 815
 816                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 817                                       "phy80211")) {
 818                         pr_err("failed to add phy80211 symlink to netdev!\n");
 819                 }
 820                 wdev->netdev = dev;
 821                 wdev->sme_state = CFG80211_SME_IDLE;
 822 #ifdef CONFIG_CFG80211_WEXT
 823                 wdev->wext.default_key = -1;
 824                 wdev->wext.default_mgmt_key = -1;
 825                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 826 #endif
 827
 828                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
 829                         wdev->ps = true;
 830                 else
 831                         wdev->ps = false;
 832                 /* allow mac80211 to determine the timeout */
 833                 wdev->ps_timeout = -1;
 834
 835                 netdev_set_default_ethtool_ops(dev, &cfg80211_ethtool_ops);
 836
 837                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 838                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
 839                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
 840                         dev->priv_flags |= IFF_DONT_BRIDGE;
 841                 break;
 842         case NETDEV_GOING_DOWN:
 843                 cfg80211_leave(rdev, wdev);
 844                 break;
 845         case NETDEV_DOWN:
 846                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
 847                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 848                         if (WARN_ON(!rdev->scan_req->notified))
 849                                 rdev->scan_req->aborted = true;
 850                         ___cfg80211_scan_done(rdev, true);
 851                 }
 852
 853                 if (WARN_ON(rdev->sched_scan_req &&
 854                             rdev->sched_scan_req->dev == wdev->netdev)) {
 855                         __cfg80211_stop_sched_scan(rdev, false);
 856                 }
 857
 858                 rdev->opencount--;
 859                 wake_up(&rdev->dev_wait);
 860                 break;
 861         case NETDEV_UP:
 862                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
 863                 wdev_lock(wdev);
 864                 switch (wdev->iftype) {
 865 #ifdef CONFIG_CFG80211_WEXT
 866                 case NL80211_IFTYPE_ADHOC:
 867                         cfg80211_ibss_wext_join(rdev, wdev);
 868                         break;
 869                 case NL80211_IFTYPE_STATION:
 870                         cfg80211_mgd_wext_connect(rdev, wdev);
 871                         break;
 872 #endif
 873 #ifdef CONFIG_MAC80211_MESH
 874                 case NL80211_IFTYPE_MESH_POINT:
 875                         {
 876                                 /* backward compat code... */
 877                                 struct mesh_setup setup;
 878                                 memcpy(&setup, &default_mesh_setup,
 879                                                 sizeof(setup));
 880                                  /* back compat only needed for mesh_id */
 881                                 setup.mesh_id = wdev->ssid;
 882                                 setup.mesh_id_len = wdev->mesh_id_up_len;
 883                                 if (wdev->mesh_id_up_len)
 884                                         __cfg80211_join_mesh(rdev, dev,
 885                                                         &setup,
 886                                                         &default_mesh_config);
 887                                 break;
 888                         }
 889 #endif
 890                 default:
 891                         break;
 892                 }
 893                 wdev_unlock(wdev);
 894                 rdev->opencount++;
 895
 896                 /*
 897                  * Configure power management to the driver here so that its
 898                  * correctly set also after interface type changes etc.
 899                  */
 900                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 901                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
 902                     rdev->ops->set_power_mgmt)
 903                         if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
 904                                                 wdev->ps_timeout)) {
 905                                 /* assume this means it's off */
 906                                 wdev->ps = false;
 907                         }
 908                 break;
 909         case NETDEV_UNREGISTER:
 910                 /*
 911                  * It is possible to get NETDEV_UNREGISTER
 912                  * multiple times. To detect that, check
 913                  * that the interface is still on the list
 914                  * of registered interfaces, and only then
 915                  * remove and clean it up.
 916                  */
 917                 if (!list_empty(&wdev->list)) {
 918                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 919                         list_del_rcu(&wdev->list);
 920                         rdev->devlist_generation++;
 921                         cfg80211_mlme_purge_registrations(wdev);
 922 #ifdef CONFIG_CFG80211_WEXT
 923                         kfree(wdev->wext.keys);
 924 #endif
 925                 }
 926                 /*
 927                  * synchronise (so that we won't find this netdev
 928                  * from other code any more) and then clear the list
 929                  * head so that the above code can safely check for
 930                  * !list_empty() to avoid double-cleanup.
 931                  */
 932                 synchronize_rcu();
 933                 INIT_LIST_HEAD(&wdev->list);
 934                 /*
 935                  * Ensure that all events have been processed and
 936                  * freed.
 937                  */
 938                 cfg80211_process_wdev_events(wdev);
 939                 break;
 940         case NETDEV_PRE_UP:
 941                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 942                         return notifier_from_errno(-EOPNOTSUPP);
 943                 if (rfkill_blocked(rdev->rfkill))
 944                         return notifier_from_errno(-ERFKILL);
 945                 ret = cfg80211_can_add_interface(rdev, wdev->iftype);
 946                 if (ret)
 947                         return notifier_from_errno(ret);
 948                 break;
 949         }
 950
 951         return NOTIFY_DONE;
 952 }
 953
 954 static struct notifier_block cfg80211_netdev_notifier = {
 955         .notifier_call = cfg80211_netdev_notifier_call,
 956 };
 957
 958 static void __net_exit cfg80211_pernet_exit(struct net *net)
 959 {
 960         struct cfg80211_registered_device *rdev;
 961
 962         rtnl_lock();
 963         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 964                 if (net_eq(wiphy_net(&rdev->wiphy), net))
 965                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
 966         }
 967         rtnl_unlock();
 968 }
 969
 970 static struct pernet_operations cfg80211_pernet_ops = {
 971         .exit = cfg80211_pernet_exit,
 972 };
 973
 974 static int __init cfg80211_init(void)
 975 {
 976         int err;
 977
 978         err = register_pernet_device(&cfg80211_pernet_ops);
 979         if (err)
 980                 goto out_fail_pernet;
 981
 982         err = wiphy_sysfs_init();
 983         if (err)
 984                 goto out_fail_sysfs;
 985
 986         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
 987         if (err)
 988                 goto out_fail_notifier;
 989
 990         err = nl80211_init();
 991         if (err)
 992                 goto out_fail_nl80211;
 993
 994         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
 995
 996         err = regulatory_init();
 997         if (err)
 998                 goto out_fail_reg;
 999
1000         cfg80211_wq = create_singlethread_workqueue("cfg80211");
1001         if (!cfg80211_wq) {
1002                 err = -ENOMEM;
1003                 goto out_fail_wq;
1004         }
1005
1006         return 0;
1007
1008 out_fail_wq:
1009         regulatory_exit();
1010 out_fail_reg:
1011         debugfs_remove(ieee80211_debugfs_dir);
1012 out_fail_nl80211:
1013         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1014 out_fail_notifier:
1015         wiphy_sysfs_exit();
1016 out_fail_sysfs:
1017         unregister_pernet_device(&cfg80211_pernet_ops);
1018 out_fail_pernet:
1019         return err;
1020 }
1021 subsys_initcall(cfg80211_init);
1022
1023 static void __exit cfg80211_exit(void)
1024 {
1025         debugfs_remove(ieee80211_debugfs_dir);
1026         nl80211_exit();
1027         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1028         wiphy_sysfs_exit();
1029         regulatory_exit();
1030         unregister_pernet_device(&cfg80211_pernet_ops);
1031         destroy_workqueue(cfg80211_wq);
1032 }
1033 module_exit(cfg80211_exit);