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 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 /* requires cfg80211_mutex to be held! */
  55 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  56 {
  57         struct cfg80211_registered_device *result = NULL, *rdev;
  58
  59         if (!wiphy_idx_valid(wiphy_idx))
  60                 return NULL;
  61
  62         assert_cfg80211_lock();
  63
  64         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  65                 if (rdev->wiphy_idx == wiphy_idx) {
  66                         result = rdev;
  67                         break;
  68                 }
  69         }
  70
  71         return result;
  72 }
  73
  74 int get_wiphy_idx(struct wiphy *wiphy)
  75 {
  76         struct cfg80211_registered_device *rdev;
  77         if (!wiphy)
  78                 return WIPHY_IDX_STALE;
  79         rdev = wiphy_to_dev(wiphy);
  80         return rdev->wiphy_idx;
  81 }
  82
  83 /* requires cfg80211_rdev_mutex to be held! */
  84 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  85 {
  86         struct cfg80211_registered_device *rdev;
  87
  88         if (!wiphy_idx_valid(wiphy_idx))
  89                 return NULL;
  90
  91         assert_cfg80211_lock();
  92
  93         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  94         if (!rdev)
  95                 return NULL;
  96         return &rdev->wiphy;
  97 }
  98
  99 struct cfg80211_registered_device *
 100 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
 101 {
 102         struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
 103         struct net_device *dev;
 104
 105         mutex_lock(&cfg80211_mutex);
 106         dev = dev_get_by_index(net, ifindex);
 107         if (!dev)
 108                 goto out;
 109         if (dev->ieee80211_ptr) {
 110                 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 111                 mutex_lock(&rdev->mtx);
 112         } else
 113                 rdev = ERR_PTR(-ENODEV);
 114         dev_put(dev);
 115  out:
 116         mutex_unlock(&cfg80211_mutex);
 117         return rdev;
 118 }
 119
 120 /* requires cfg80211_mutex to be held */
 121 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 122                         char *newname)
 123 {
 124         struct cfg80211_registered_device *rdev2;
 125         int wiphy_idx, taken = -1, result, digits;
 126
 127         assert_cfg80211_lock();
 128
 129         /* prohibit calling the thing phy%d when %d is not its number */
 130         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 131         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 132                 /* count number of places needed to print wiphy_idx */
 133                 digits = 1;
 134                 while (wiphy_idx /= 10)
 135                         digits++;
 136                 /*
 137                  * deny the name if it is phy<idx> where <idx> is printed
 138                  * without leading zeroes. taken == strlen(newname) here
 139                  */
 140                 if (taken == strlen(PHY_NAME) + digits)
 141                         return -EINVAL;
 142         }
 143
 144
 145         /* Ignore nop renames */
 146         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
 147                 return 0;
 148
 149         /* Ensure another device does not already have this name. */
 150         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 151                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
 152                         return -EINVAL;
 153
 154         result = device_rename(&rdev->wiphy.dev, newname);
 155         if (result)
 156                 return result;
 157
 158         if (rdev->wiphy.debugfsdir &&
 159             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 160                             rdev->wiphy.debugfsdir,
 161                             rdev->wiphy.debugfsdir->d_parent,
 162                             newname))
 163                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 164
 165         nl80211_notify_dev_rename(rdev);
 166
 167         return 0;
 168 }
 169
 170 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 171                           struct net *net)
 172 {
 173         struct wireless_dev *wdev;
 174         int err = 0;
 175
 176         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 177                 return -EOPNOTSUPP;
 178
 179         list_for_each_entry(wdev, &rdev->netdev_list, list) {
 180                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 181                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 182                 if (err)
 183                         break;
 184                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 185         }
 186
 187         if (err) {
 188                 /* failed -- clean up to old netns */
 189                 net = wiphy_net(&rdev->wiphy);
 190
 191                 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
 192                                                      list) {
 193                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 194                         err = dev_change_net_namespace(wdev->netdev, net,
 195                                                         "wlan%d");
 196                         WARN_ON(err);
 197                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 198                 }
 199
 200                 return err;
 201         }
 202
 203         wiphy_net_set(&rdev->wiphy, net);
 204
 205         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 206         WARN_ON(err);
 207
 208         return 0;
 209 }
 210
 211 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 212 {
 213         struct cfg80211_registered_device *rdev = data;
 214
 215         rdev->ops->rfkill_poll(&rdev->wiphy);
 216 }
 217
 218 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 219 {
 220         struct cfg80211_registered_device *rdev = data;
 221         struct wireless_dev *wdev;
 222
 223         if (!blocked)
 224                 return 0;
 225
 226         rtnl_lock();
 227         mutex_lock(&rdev->devlist_mtx);
 228
 229         list_for_each_entry(wdev, &rdev->netdev_list, list)
 230                 dev_close(wdev->netdev);
 231
 232         mutex_unlock(&rdev->devlist_mtx);
 233         rtnl_unlock();
 234
 235         return 0;
 236 }
 237
 238 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 239 {
 240         struct cfg80211_registered_device *rdev;
 241
 242         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 243         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 244 }
 245
 246 static void cfg80211_event_work(struct work_struct *work)
 247 {
 248         struct cfg80211_registered_device *rdev;
 249
 250         rdev = container_of(work, struct cfg80211_registered_device,
 251                             event_work);
 252
 253         rtnl_lock();
 254         cfg80211_lock_rdev(rdev);
 255
 256         cfg80211_process_rdev_events(rdev);
 257         cfg80211_unlock_rdev(rdev);
 258         rtnl_unlock();
 259 }
 260
 261 /* exported functions */
 262
 263 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 264 {
 265         static int wiphy_counter;
 266
 267         struct cfg80211_registered_device *rdev;
 268         int alloc_size;
 269
 270         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 271         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 272         WARN_ON(ops->connect && !ops->disconnect);
 273         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 274         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 275         WARN_ON(ops->add_station && !ops->del_station);
 276         WARN_ON(ops->add_mpath && !ops->del_mpath);
 277         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 278
 279         alloc_size = sizeof(*rdev) + sizeof_priv;
 280
 281         rdev = kzalloc(alloc_size, GFP_KERNEL);
 282         if (!rdev)
 283                 return NULL;
 284
 285         rdev->ops = ops;
 286
 287         mutex_lock(&cfg80211_mutex);
 288
 289         rdev->wiphy_idx = wiphy_counter++;
 290
 291         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
 292                 wiphy_counter--;
 293                 mutex_unlock(&cfg80211_mutex);
 294                 /* ugh, wrapped! */
 295                 kfree(rdev);
 296                 return NULL;
 297         }
 298
 299         mutex_unlock(&cfg80211_mutex);
 300
 301         /* give it a proper name */
 302         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 303
 304         mutex_init(&rdev->mtx);
 305         mutex_init(&rdev->devlist_mtx);
 306         mutex_init(&rdev->sched_scan_mtx);
 307         INIT_LIST_HEAD(&rdev->netdev_list);
 308         spin_lock_init(&rdev->bss_lock);
 309         INIT_LIST_HEAD(&rdev->bss_list);
 310         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 311         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 312 #ifdef CONFIG_CFG80211_WEXT
 313         rdev->wiphy.wext = &cfg80211_wext_handler;
 314 #endif
 315
 316         device_initialize(&rdev->wiphy.dev);
 317         rdev->wiphy.dev.class = &ieee80211_class;
 318         rdev->wiphy.dev.platform_data = rdev;
 319
 320 #ifdef CONFIG_CFG80211_DEFAULT_PS
 321         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 322 #endif
 323
 324         wiphy_net_set(&rdev->wiphy, &init_net);
 325
 326         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 327         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 328                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 329                                    &rdev->rfkill_ops, rdev);
 330
 331         if (!rdev->rfkill) {
 332                 kfree(rdev);
 333                 return NULL;
 334         }
 335
 336         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 337         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 338         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 339
 340         init_waitqueue_head(&rdev->dev_wait);
 341
 342         /*
 343          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 344          * Fragmentation and RTS threshold are disabled by default with the
 345          * special -1 value.
 346          */
 347         rdev->wiphy.retry_short = 7;
 348         rdev->wiphy.retry_long = 4;
 349         rdev->wiphy.frag_threshold = (u32) -1;
 350         rdev->wiphy.rts_threshold = (u32) -1;
 351         rdev->wiphy.coverage_class = 0;
 352
 353         return &rdev->wiphy;
 354 }
 355 EXPORT_SYMBOL(wiphy_new);
 356
 357 static int wiphy_verify_combinations(struct wiphy *wiphy)
 358 {
 359         const struct ieee80211_iface_combination *c;
 360         int i, j;
 361
 362         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 363                 u32 cnt = 0;
 364                 u16 all_iftypes = 0;
 365
 366                 c = &wiphy->iface_combinations[i];
 367
 368                 /* Combinations with just one interface aren't real */
 369                 if (WARN_ON(c->max_interfaces < 2))
 370                         return -EINVAL;
 371
 372                 /* Need at least one channel */
 373                 if (WARN_ON(!c->num_different_channels))
 374                         return -EINVAL;
 375
 376                 if (WARN_ON(!c->n_limits))
 377                         return -EINVAL;
 378
 379                 for (j = 0; j < c->n_limits; j++) {
 380                         u16 types = c->limits[j].types;
 381
 382                         /*
 383                          * interface types shouldn't overlap, this is
 384                          * used in cfg80211_can_change_interface()
 385                          */
 386                         if (WARN_ON(types & all_iftypes))
 387                                 return -EINVAL;
 388                         all_iftypes |= types;
 389
 390                         if (WARN_ON(!c->limits[j].max))
 391                                 return -EINVAL;
 392
 393                         /* Shouldn't list software iftypes in combinations! */
 394                         if (WARN_ON(wiphy->software_iftypes & types))
 395                                 return -EINVAL;
 396
 397                         cnt += c->limits[j].max;
 398                         /*
 399                          * Don't advertise an unsupported type
 400                          * in a combination.
 401                          */
 402                         if (WARN_ON((wiphy->interface_modes & types) != types))
 403                                 return -EINVAL;
 404                 }
 405
 406                 /* You can't even choose that many! */
 407                 if (WARN_ON(cnt < c->max_interfaces))
 408                         return -EINVAL;
 409         }
 410
 411         return 0;
 412 }
 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->wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 425                     !(wiphy->wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 426                 return -EINVAL;
 427
 428         if (WARN_ON(wiphy->ap_sme_capa &&
 429                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 430                 return -EINVAL;
 431
 432         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 433                 return -EINVAL;
 434
 435         if (WARN_ON(wiphy->addresses &&
 436                     !is_zero_ether_addr(wiphy->perm_addr) &&
 437                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 438                            ETH_ALEN)))
 439                 return -EINVAL;
 440
 441         if (wiphy->addresses)
 442                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 443
 444         /* sanity check ifmodes */
 445         WARN_ON(!ifmodes);
 446         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 447         if (WARN_ON(ifmodes != wiphy->interface_modes))
 448                 wiphy->interface_modes = ifmodes;
 449
 450         res = wiphy_verify_combinations(wiphy);
 451         if (res)
 452                 return res;
 453
 454         /* sanity check supported bands/channels */
 455         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 456                 sband = wiphy->bands[band];
 457                 if (!sband)
 458                         continue;
 459
 460                 sband->band = band;
 461
 462                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
 463                         return -EINVAL;
 464
 465                 /*
 466                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 467                  * modify the sband's ht data even if the driver uses a
 468                  * global structure for that.
 469                  */
 470                 if (cfg80211_disable_40mhz_24ghz &&
 471                     band == IEEE80211_BAND_2GHZ &&
 472                     sband->ht_cap.ht_supported) {
 473                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 474                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 475                 }
 476
 477                 /*
 478                  * Since we use a u32 for rate bitmaps in
 479                  * ieee80211_get_response_rate, we cannot
 480                  * have more than 32 legacy rates.
 481                  */
 482                 if (WARN_ON(sband->n_bitrates > 32))
 483                         return -EINVAL;
 484
 485                 for (i = 0; i < sband->n_channels; i++) {
 486                         sband->channels[i].orig_flags =
 487                                 sband->channels[i].flags;
 488                         sband->channels[i].orig_mag =
 489                                 sband->channels[i].max_antenna_gain;
 490                         sband->channels[i].orig_mpwr =
 491                                 sband->channels[i].max_power;
 492                         sband->channels[i].band = band;
 493                 }
 494
 495                 have_band = true;
 496         }
 497
 498         if (!have_band) {
 499                 WARN_ON(1);
 500                 return -EINVAL;
 501         }
 502
 503         if (rdev->wiphy.wowlan.n_patterns) {
 504                 if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len ||
 505                             rdev->wiphy.wowlan.pattern_min_len >
 506                             rdev->wiphy.wowlan.pattern_max_len))
 507                         return -EINVAL;
 508         }
 509
 510         /* check and set up bitrates */
 511         ieee80211_set_bitrate_flags(wiphy);
 512
 513         mutex_lock(&cfg80211_mutex);
 514
 515         res = device_add(&rdev->wiphy.dev);
 516         if (res) {
 517                 mutex_unlock(&cfg80211_mutex);
 518                 return res;
 519         }
 520
 521         /* set up regulatory info */
 522         regulatory_update(wiphy, NL80211_REGDOM_SET_BY_CORE);
 523
 524         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 525         cfg80211_rdev_list_generation++;
 526
 527         /* add to debugfs */
 528         rdev->wiphy.debugfsdir =
 529                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 530                                    ieee80211_debugfs_dir);
 531         if (IS_ERR(rdev->wiphy.debugfsdir))
 532                 rdev->wiphy.debugfsdir = NULL;
 533
 534         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
 535                 struct regulatory_request request;
 536
 537                 request.wiphy_idx = get_wiphy_idx(wiphy);
 538                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 539                 request.alpha2[0] = '9';
 540                 request.alpha2[1] = '9';
 541
 542                 nl80211_send_reg_change_event(&request);
 543         }
 544
 545         cfg80211_debugfs_rdev_add(rdev);
 546         mutex_unlock(&cfg80211_mutex);
 547
 548         /*
 549          * due to a locking dependency this has to be outside of the
 550          * cfg80211_mutex lock
 551          */
 552         res = rfkill_register(rdev->rfkill);
 553         if (res)
 554                 goto out_rm_dev;
 555
 556         rtnl_lock();
 557         rdev->wiphy.registered = true;
 558         rtnl_unlock();
 559         return 0;
 560
 561 out_rm_dev:
 562         device_del(&rdev->wiphy.dev);
 563         return res;
 564 }
 565 EXPORT_SYMBOL(wiphy_register);
 566
 567 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 568 {
 569         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 570
 571         if (!rdev->ops->rfkill_poll)
 572                 return;
 573         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 574         rfkill_resume_polling(rdev->rfkill);
 575 }
 576 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 577
 578 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 579 {
 580         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 581
 582         rfkill_pause_polling(rdev->rfkill);
 583 }
 584 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 585
 586 void wiphy_unregister(struct wiphy *wiphy)
 587 {
 588         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 589
 590         rtnl_lock();
 591         rdev->wiphy.registered = false;
 592         rtnl_unlock();
 593
 594         rfkill_unregister(rdev->rfkill);
 595
 596         /* protect the device list */
 597         mutex_lock(&cfg80211_mutex);
 598
 599         wait_event(rdev->dev_wait, ({
 600                 int __count;
 601                 mutex_lock(&rdev->devlist_mtx);
 602                 __count = rdev->opencount;
 603                 mutex_unlock(&rdev->devlist_mtx);
 604                 __count == 0; }));
 605
 606         mutex_lock(&rdev->devlist_mtx);
 607         BUG_ON(!list_empty(&rdev->netdev_list));
 608         mutex_unlock(&rdev->devlist_mtx);
 609
 610         /*
 611          * First remove the hardware from everywhere, this makes
 612          * it impossible to find from userspace.
 613          */
 614         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 615         list_del_rcu(&rdev->list);
 616         synchronize_rcu();
 617
 618         /*
 619          * Try to grab rdev->mtx. If a command is still in progress,
 620          * hopefully the driver will refuse it since it's tearing
 621          * down the device already. We wait for this command to complete
 622          * before unlinking the item from the list.
 623          * Note: as codified by the BUG_ON above we cannot get here if
 624          * a virtual interface is still present. Hence, we can only get
 625          * to lock contention here if userspace issues a command that
 626          * identified the hardware by wiphy index.
 627          */
 628         cfg80211_lock_rdev(rdev);
 629         /* nothing */
 630         cfg80211_unlock_rdev(rdev);
 631
 632         /* If this device got a regulatory hint tell core its
 633          * free to listen now to a new shiny device regulatory hint */
 634         reg_device_remove(wiphy);
 635
 636         cfg80211_rdev_list_generation++;
 637         device_del(&rdev->wiphy.dev);
 638
 639         mutex_unlock(&cfg80211_mutex);
 640
 641         flush_work(&rdev->scan_done_wk);
 642         cancel_work_sync(&rdev->conn_work);
 643         flush_work(&rdev->event_work);
 644
 645         if (rdev->wowlan && rdev->ops->set_wakeup)
 646                 rdev->ops->set_wakeup(&rdev->wiphy, false);
 647         cfg80211_rdev_free_wowlan(rdev);
 648 }
 649 EXPORT_SYMBOL(wiphy_unregister);
 650
 651 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 652 {
 653         struct cfg80211_internal_bss *scan, *tmp;
 654         rfkill_destroy(rdev->rfkill);
 655         mutex_destroy(&rdev->mtx);
 656         mutex_destroy(&rdev->devlist_mtx);
 657         mutex_destroy(&rdev->sched_scan_mtx);
 658         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 659                 cfg80211_put_bss(&scan->pub);
 660         kfree(rdev);
 661 }
 662
 663 void wiphy_free(struct wiphy *wiphy)
 664 {
 665         put_device(&wiphy->dev);
 666 }
 667 EXPORT_SYMBOL(wiphy_free);
 668
 669 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 670 {
 671         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 672
 673         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 674                 schedule_work(&rdev->rfkill_sync);
 675 }
 676 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 677
 678 static void wdev_cleanup_work(struct work_struct *work)
 679 {
 680         struct wireless_dev *wdev;
 681         struct cfg80211_registered_device *rdev;
 682
 683         wdev = container_of(work, struct wireless_dev, cleanup_work);
 684         rdev = wiphy_to_dev(wdev->wiphy);
 685
 686         cfg80211_lock_rdev(rdev);
 687
 688         if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
 689                 rdev->scan_req->aborted = true;
 690                 ___cfg80211_scan_done(rdev, true);
 691         }
 692
 693         cfg80211_unlock_rdev(rdev);
 694
 695         mutex_lock(&rdev->sched_scan_mtx);
 696
 697         if (WARN_ON(rdev->sched_scan_req &&
 698                     rdev->sched_scan_req->dev == wdev->netdev)) {
 699                 __cfg80211_stop_sched_scan(rdev, false);
 700         }
 701
 702         mutex_unlock(&rdev->sched_scan_mtx);
 703
 704         mutex_lock(&rdev->devlist_mtx);
 705         rdev->opencount--;
 706         mutex_unlock(&rdev->devlist_mtx);
 707         wake_up(&rdev->dev_wait);
 708
 709         dev_put(wdev->netdev);
 710 }
 711
 712 static struct device_type wiphy_type = {
 713         .name   = "wlan",
 714 };
 715
 716 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 717                                          unsigned long state,
 718                                          void *ndev)
 719 {
 720         struct net_device *dev = ndev;
 721         struct wireless_dev *wdev = dev->ieee80211_ptr;
 722         struct cfg80211_registered_device *rdev;
 723         int ret;
 724
 725         if (!wdev)
 726                 return NOTIFY_DONE;
 727
 728         rdev = wiphy_to_dev(wdev->wiphy);
 729
 730         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 731
 732         switch (state) {
 733         case NETDEV_POST_INIT:
 734                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 735                 break;
 736         case NETDEV_REGISTER:
 737                 /*
 738                  * NB: cannot take rdev->mtx here because this may be
 739                  * called within code protected by it when interfaces
 740                  * are added with nl80211.
 741                  */
 742                 mutex_init(&wdev->mtx);
 743                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
 744                 INIT_LIST_HEAD(&wdev->event_list);
 745                 spin_lock_init(&wdev->event_lock);
 746                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
 747                 spin_lock_init(&wdev->mgmt_registrations_lock);
 748
 749                 mutex_lock(&rdev->devlist_mtx);
 750                 list_add_rcu(&wdev->list, &rdev->netdev_list);
 751                 rdev->devlist_generation++;
 752                 /* can only change netns with wiphy */
 753                 dev->features |= NETIF_F_NETNS_LOCAL;
 754
 755                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 756                                       "phy80211")) {
 757                         pr_err("failed to add phy80211 symlink to netdev!\n");
 758                 }
 759                 wdev->netdev = dev;
 760                 wdev->sme_state = CFG80211_SME_IDLE;
 761                 mutex_unlock(&rdev->devlist_mtx);
 762 #ifdef CONFIG_CFG80211_WEXT
 763                 wdev->wext.default_key = -1;
 764                 wdev->wext.default_mgmt_key = -1;
 765                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 766 #endif
 767
 768                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
 769                         wdev->ps = true;
 770                 else
 771                         wdev->ps = false;
 772                 /* allow mac80211 to determine the timeout */
 773                 wdev->ps_timeout = -1;
 774
 775                 if (!dev->ethtool_ops)
 776                         dev->ethtool_ops = &cfg80211_ethtool_ops;
 777
 778                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 779                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
 780                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
 781                         dev->priv_flags |= IFF_DONT_BRIDGE;
 782                 break;
 783         case NETDEV_GOING_DOWN:
 784                 switch (wdev->iftype) {
 785                 case NL80211_IFTYPE_ADHOC:
 786                         cfg80211_leave_ibss(rdev, dev, true);
 787                         break;
 788                 case NL80211_IFTYPE_P2P_CLIENT:
 789                 case NL80211_IFTYPE_STATION:
 790                         mutex_lock(&rdev->sched_scan_mtx);
 791                         __cfg80211_stop_sched_scan(rdev, false);
 792                         mutex_unlock(&rdev->sched_scan_mtx);
 793
 794                         wdev_lock(wdev);
 795 #ifdef CONFIG_CFG80211_WEXT
 796                         kfree(wdev->wext.ie);
 797                         wdev->wext.ie = NULL;
 798                         wdev->wext.ie_len = 0;
 799                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 800 #endif
 801                         __cfg80211_disconnect(rdev, dev,
 802                                               WLAN_REASON_DEAUTH_LEAVING, true);
 803                         cfg80211_mlme_down(rdev, dev);
 804                         wdev_unlock(wdev);
 805                         break;
 806                 case NL80211_IFTYPE_MESH_POINT:
 807                         cfg80211_leave_mesh(rdev, dev);
 808                         break;
 809                 default:
 810                         break;
 811                 }
 812                 wdev->beacon_interval = 0;
 813                 break;
 814         case NETDEV_DOWN:
 815                 dev_hold(dev);
 816                 queue_work(cfg80211_wq, &wdev->cleanup_work);
 817                 break;
 818         case NETDEV_UP:
 819                 /*
 820                  * If we have a really quick DOWN/UP succession we may
 821                  * have this work still pending ... cancel it and see
 822                  * if it was pending, in which case we need to account
 823                  * for some of the work it would have done.
 824                  */
 825                 if (cancel_work_sync(&wdev->cleanup_work)) {
 826                         mutex_lock(&rdev->devlist_mtx);
 827                         rdev->opencount--;
 828                         mutex_unlock(&rdev->devlist_mtx);
 829                         dev_put(dev);
 830                 }
 831                 cfg80211_lock_rdev(rdev);
 832                 mutex_lock(&rdev->devlist_mtx);
 833                 wdev_lock(wdev);
 834                 switch (wdev->iftype) {
 835 #ifdef CONFIG_CFG80211_WEXT
 836                 case NL80211_IFTYPE_ADHOC:
 837                         cfg80211_ibss_wext_join(rdev, wdev);
 838                         break;
 839                 case NL80211_IFTYPE_STATION:
 840                         cfg80211_mgd_wext_connect(rdev, wdev);
 841                         break;
 842 #endif
 843 #ifdef CONFIG_MAC80211_MESH
 844                 case NL80211_IFTYPE_MESH_POINT:
 845                         {
 846                                 /* backward compat code... */
 847                                 struct mesh_setup setup;
 848                                 memcpy(&setup, &default_mesh_setup,
 849                                                 sizeof(setup));
 850                                  /* back compat only needed for mesh_id */
 851                                 setup.mesh_id = wdev->ssid;
 852                                 setup.mesh_id_len = wdev->mesh_id_up_len;
 853                                 if (wdev->mesh_id_up_len)
 854                                         __cfg80211_join_mesh(rdev, dev,
 855                                                         &setup,
 856                                                         &default_mesh_config);
 857                                 break;
 858                         }
 859 #endif
 860                 default:
 861                         break;
 862                 }
 863                 wdev_unlock(wdev);
 864                 rdev->opencount++;
 865                 mutex_unlock(&rdev->devlist_mtx);
 866                 cfg80211_unlock_rdev(rdev);
 867
 868                 /*
 869                  * Configure power management to the driver here so that its
 870                  * correctly set also after interface type changes etc.
 871                  */
 872                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 873                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
 874                     rdev->ops->set_power_mgmt)
 875                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
 876                                                       wdev->ps,
 877                                                       wdev->ps_timeout)) {
 878                                 /* assume this means it's off */
 879                                 wdev->ps = false;
 880                         }
 881                 break;
 882         case NETDEV_UNREGISTER:
 883                 /*
 884                  * NB: cannot take rdev->mtx here because this may be
 885                  * called within code protected by it when interfaces
 886                  * are removed with nl80211.
 887                  */
 888                 mutex_lock(&rdev->devlist_mtx);
 889                 /*
 890                  * It is possible to get NETDEV_UNREGISTER
 891                  * multiple times. To detect that, check
 892                  * that the interface is still on the list
 893                  * of registered interfaces, and only then
 894                  * remove and clean it up.
 895                  */
 896                 if (!list_empty(&wdev->list)) {
 897                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 898                         list_del_rcu(&wdev->list);
 899                         rdev->devlist_generation++;
 900                         cfg80211_mlme_purge_registrations(wdev);
 901 #ifdef CONFIG_CFG80211_WEXT
 902                         kfree(wdev->wext.keys);
 903 #endif
 904                 }
 905                 mutex_unlock(&rdev->devlist_mtx);
 906                 /*
 907                  * synchronise (so that we won't find this netdev
 908                  * from other code any more) and then clear the list
 909                  * head so that the above code can safely check for
 910                  * !list_empty() to avoid double-cleanup.
 911                  */
 912                 synchronize_rcu();
 913                 INIT_LIST_HEAD(&wdev->list);
 914                 break;
 915         case NETDEV_PRE_UP:
 916                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 917                         return notifier_from_errno(-EOPNOTSUPP);
 918                 if (rfkill_blocked(rdev->rfkill))
 919                         return notifier_from_errno(-ERFKILL);
 920                 ret = cfg80211_can_add_interface(rdev, wdev->iftype);
 921                 if (ret)
 922                         return notifier_from_errno(ret);
 923                 break;
 924         }
 925
 926         return NOTIFY_DONE;
 927 }
 928
 929 static struct notifier_block cfg80211_netdev_notifier = {
 930         .notifier_call = cfg80211_netdev_notifier_call,
 931 };
 932
 933 static void __net_exit cfg80211_pernet_exit(struct net *net)
 934 {
 935         struct cfg80211_registered_device *rdev;
 936
 937         rtnl_lock();
 938         mutex_lock(&cfg80211_mutex);
 939         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 940                 if (net_eq(wiphy_net(&rdev->wiphy), net))
 941                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
 942         }
 943         mutex_unlock(&cfg80211_mutex);
 944         rtnl_unlock();
 945 }
 946
 947 static struct pernet_operations cfg80211_pernet_ops = {
 948         .exit = cfg80211_pernet_exit,
 949 };
 950
 951 static int __init cfg80211_init(void)
 952 {
 953         int err;
 954
 955         err = register_pernet_device(&cfg80211_pernet_ops);
 956         if (err)
 957                 goto out_fail_pernet;
 958
 959         err = wiphy_sysfs_init();
 960         if (err)
 961                 goto out_fail_sysfs;
 962
 963         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
 964         if (err)
 965                 goto out_fail_notifier;
 966
 967         err = nl80211_init();
 968         if (err)
 969                 goto out_fail_nl80211;
 970
 971         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
 972
 973         err = regulatory_init();
 974         if (err)
 975                 goto out_fail_reg;
 976
 977         cfg80211_wq = create_singlethread_workqueue("cfg80211");
 978         if (!cfg80211_wq)
 979                 goto out_fail_wq;
 980
 981         return 0;
 982
 983 out_fail_wq:
 984         regulatory_exit();
 985 out_fail_reg:
 986         debugfs_remove(ieee80211_debugfs_dir);
 987 out_fail_nl80211:
 988         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
 989 out_fail_notifier:
 990         wiphy_sysfs_exit();
 991 out_fail_sysfs:
 992         unregister_pernet_device(&cfg80211_pernet_ops);
 993 out_fail_pernet:
 994         return err;
 995 }
 996 subsys_initcall(cfg80211_init);
 997
 998 static void __exit cfg80211_exit(void)
 999 {
1000         debugfs_remove(ieee80211_debugfs_dir);
1001         nl80211_exit();
1002         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1003         wiphy_sysfs_exit();
1004         regulatory_exit();
1005         unregister_pernet_device(&cfg80211_pernet_ops);
1006         destroy_workqueue(cfg80211_wq);
1007 }
1008 module_exit(cfg80211_exit);