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->wdev_list, list) {
 180                 if (!wdev->netdev)
 181                         continue;
 182                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 183                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 184                 if (err)
 185                         break;
 186                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 187         }
 188
 189         if (err) {
 190                 /* failed -- clean up to old netns */
 191                 net = wiphy_net(&rdev->wiphy);
 192
 193                 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,
 194                                                      list) {
 195                         if (!wdev->netdev)
 196                                 continue;
 197                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 198                         err = dev_change_net_namespace(wdev->netdev, net,
 199                                                         "wlan%d");
 200                         WARN_ON(err);
 201                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 202                 }
 203
 204                 return err;
 205         }
 206
 207         wiphy_net_set(&rdev->wiphy, net);
 208
 209         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 210         WARN_ON(err);
 211
 212         return 0;
 213 }
 214
 215 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 216 {
 217         struct cfg80211_registered_device *rdev = data;
 218
 219         rdev->ops->rfkill_poll(&rdev->wiphy);
 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         mutex_lock(&rdev->devlist_mtx);
 232
 233         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 234                 if (wdev->netdev) {
 235                         dev_close(wdev->netdev);
 236                         continue;
 237                 }
 238                 /* otherwise, check iftype */
 239                 switch (wdev->iftype) {
 240                 case NL80211_IFTYPE_P2P_DEVICE:
 241                         if (!wdev->p2p_started)
 242                                 break;
 243                         rdev->ops->stop_p2p_device(&rdev->wiphy, wdev);
 244                         wdev->p2p_started = false;
 245                         rdev->opencount--;
 246                         break;
 247                 default:
 248                         break;
 249                 }
 250         }
 251
 252         mutex_unlock(&rdev->devlist_mtx);
 253         rtnl_unlock();
 254
 255         return 0;
 256 }
 257
 258 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 259 {
 260         struct cfg80211_registered_device *rdev;
 261
 262         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 263         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 264 }
 265
 266 static void cfg80211_event_work(struct work_struct *work)
 267 {
 268         struct cfg80211_registered_device *rdev;
 269
 270         rdev = container_of(work, struct cfg80211_registered_device,
 271                             event_work);
 272
 273         rtnl_lock();
 274         cfg80211_lock_rdev(rdev);
 275
 276         cfg80211_process_rdev_events(rdev);
 277         cfg80211_unlock_rdev(rdev);
 278         rtnl_unlock();
 279 }
 280
 281 /* exported functions */
 282
 283 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 284 {
 285         static int wiphy_counter;
 286
 287         struct cfg80211_registered_device *rdev;
 288         int alloc_size;
 289
 290         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 291         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 292         WARN_ON(ops->connect && !ops->disconnect);
 293         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 294         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 295         WARN_ON(ops->add_station && !ops->del_station);
 296         WARN_ON(ops->add_mpath && !ops->del_mpath);
 297         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 298
 299         alloc_size = sizeof(*rdev) + sizeof_priv;
 300
 301         rdev = kzalloc(alloc_size, GFP_KERNEL);
 302         if (!rdev)
 303                 return NULL;
 304
 305         rdev->ops = ops;
 306
 307         mutex_lock(&cfg80211_mutex);
 308
 309         rdev->wiphy_idx = wiphy_counter++;
 310
 311         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
 312                 wiphy_counter--;
 313                 mutex_unlock(&cfg80211_mutex);
 314                 /* ugh, wrapped! */
 315                 kfree(rdev);
 316                 return NULL;
 317         }
 318
 319         mutex_unlock(&cfg80211_mutex);
 320
 321         /* give it a proper name */
 322         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 323
 324         mutex_init(&rdev->mtx);
 325         mutex_init(&rdev->devlist_mtx);
 326         mutex_init(&rdev->sched_scan_mtx);
 327         INIT_LIST_HEAD(&rdev->wdev_list);
 328         spin_lock_init(&rdev->bss_lock);
 329         INIT_LIST_HEAD(&rdev->bss_list);
 330         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 331         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 332 #ifdef CONFIG_CFG80211_WEXT
 333         rdev->wiphy.wext = &cfg80211_wext_handler;
 334 #endif
 335
 336         device_initialize(&rdev->wiphy.dev);
 337         rdev->wiphy.dev.class = &ieee80211_class;
 338         rdev->wiphy.dev.platform_data = rdev;
 339
 340 #ifdef CONFIG_CFG80211_DEFAULT_PS
 341         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 342 #endif
 343
 344         wiphy_net_set(&rdev->wiphy, &init_net);
 345
 346         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 347         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 348                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 349                                    &rdev->rfkill_ops, rdev);
 350
 351         if (!rdev->rfkill) {
 352                 kfree(rdev);
 353                 return NULL;
 354         }
 355
 356         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 357         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 358         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 359
 360         init_waitqueue_head(&rdev->dev_wait);
 361
 362         /*
 363          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 364          * Fragmentation and RTS threshold are disabled by default with the
 365          * special -1 value.
 366          */
 367         rdev->wiphy.retry_short = 7;
 368         rdev->wiphy.retry_long = 4;
 369         rdev->wiphy.frag_threshold = (u32) -1;
 370         rdev->wiphy.rts_threshold = (u32) -1;
 371         rdev->wiphy.coverage_class = 0;
 372
 373         return &rdev->wiphy;
 374 }
 375 EXPORT_SYMBOL(wiphy_new);
 376
 377 static int wiphy_verify_combinations(struct wiphy *wiphy)
 378 {
 379         const struct ieee80211_iface_combination *c;
 380         int i, j;
 381
 382         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 383                 u32 cnt = 0;
 384                 u16 all_iftypes = 0;
 385
 386                 c = &wiphy->iface_combinations[i];
 387
 388                 /* Combinations with just one interface aren't real */
 389                 if (WARN_ON(c->max_interfaces < 2))
 390                         return -EINVAL;
 391
 392                 /* Need at least one channel */
 393                 if (WARN_ON(!c->num_different_channels))
 394                         return -EINVAL;
 395
 396                 /*
 397                  * Put a sane limit on maximum number of different
 398                  * channels to simplify channel accounting code.
 399                  */
 400                 if (WARN_ON(c->num_different_channels >
 401                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 402                         return -EINVAL;
 403
 404                 if (WARN_ON(!c->n_limits))
 405                         return -EINVAL;
 406
 407                 for (j = 0; j < c->n_limits; j++) {
 408                         u16 types = c->limits[j].types;
 409
 410                         /*
 411                          * interface types shouldn't overlap, this is
 412                          * used in cfg80211_can_change_interface()
 413                          */
 414                         if (WARN_ON(types & all_iftypes))
 415                                 return -EINVAL;
 416                         all_iftypes |= types;
 417
 418                         if (WARN_ON(!c->limits[j].max))
 419                                 return -EINVAL;
 420
 421                         /* Shouldn't list software iftypes in combinations! */
 422                         if (WARN_ON(wiphy->software_iftypes & types))
 423                                 return -EINVAL;
 424
 425                         /* Only a single P2P_DEVICE can be allowed */
 426                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 427                                     c->limits[j].max > 1))
 428                                 return -EINVAL;
 429
 430                         cnt += c->limits[j].max;
 431                         /*
 432                          * Don't advertise an unsupported type
 433                          * in a combination.
 434                          */
 435                         if (WARN_ON((wiphy->interface_modes & types) != types))
 436                                 return -EINVAL;
 437                 }
 438
 439                 /* You can't even choose that many! */
 440                 if (WARN_ON(cnt < c->max_interfaces))
 441                         return -EINVAL;
 442         }
 443
 444         return 0;
 445 }
 446
 447 int wiphy_register(struct wiphy *wiphy)
 448 {
 449         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 450         int res;
 451         enum ieee80211_band band;
 452         struct ieee80211_supported_band *sband;
 453         bool have_band = false;
 454         int i;
 455         u16 ifmodes = wiphy->interface_modes;
 456
 457 #ifdef CONFIG_PM
 458         if (WARN_ON((wiphy->wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 459                     !(wiphy->wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 460                 return -EINVAL;
 461 #endif
 462
 463         if (WARN_ON(wiphy->ap_sme_capa &&
 464                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 465                 return -EINVAL;
 466
 467         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 468                 return -EINVAL;
 469
 470         if (WARN_ON(wiphy->addresses &&
 471                     !is_zero_ether_addr(wiphy->perm_addr) &&
 472                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 473                            ETH_ALEN)))
 474                 return -EINVAL;
 475
 476         if (wiphy->addresses)
 477                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 478
 479         /* sanity check ifmodes */
 480         WARN_ON(!ifmodes);
 481         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 482         if (WARN_ON(ifmodes != wiphy->interface_modes))
 483                 wiphy->interface_modes = ifmodes;
 484
 485         res = wiphy_verify_combinations(wiphy);
 486         if (res)
 487                 return res;
 488
 489         /* sanity check supported bands/channels */
 490         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 491                 sband = wiphy->bands[band];
 492                 if (!sband)
 493                         continue;
 494
 495                 sband->band = band;
 496                 if (WARN_ON(!sband->n_channels))
 497                         return -EINVAL;
 498                 /*
 499                  * on 60gHz band, there are no legacy rates, so
 500                  * n_bitrates is 0
 501                  */
 502                 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
 503                             !sband->n_bitrates))
 504                         return -EINVAL;
 505
 506                 /*
 507                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 508                  * modify the sband's ht data even if the driver uses a
 509                  * global structure for that.
 510                  */
 511                 if (cfg80211_disable_40mhz_24ghz &&
 512                     band == IEEE80211_BAND_2GHZ &&
 513                     sband->ht_cap.ht_supported) {
 514                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 515                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 516                 }
 517
 518                 /*
 519                  * Since we use a u32 for rate bitmaps in
 520                  * ieee80211_get_response_rate, we cannot
 521                  * have more than 32 legacy rates.
 522                  */
 523                 if (WARN_ON(sband->n_bitrates > 32))
 524                         return -EINVAL;
 525
 526                 for (i = 0; i < sband->n_channels; i++) {
 527                         sband->channels[i].orig_flags =
 528                                 sband->channels[i].flags;
 529                         sband->channels[i].orig_mag = INT_MAX;
 530                         sband->channels[i].orig_mpwr =
 531                                 sband->channels[i].max_power;
 532                         sband->channels[i].band = band;
 533                 }
 534
 535                 have_band = true;
 536         }
 537
 538         if (!have_band) {
 539                 WARN_ON(1);
 540                 return -EINVAL;
 541         }
 542
 543 #ifdef CONFIG_PM
 544         if (rdev->wiphy.wowlan.n_patterns) {
 545                 if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len ||
 546                             rdev->wiphy.wowlan.pattern_min_len >
 547                             rdev->wiphy.wowlan.pattern_max_len))
 548                         return -EINVAL;
 549         }
 550 #endif
 551
 552         /* check and set up bitrates */
 553         ieee80211_set_bitrate_flags(wiphy);
 554
 555         mutex_lock(&cfg80211_mutex);
 556
 557         res = device_add(&rdev->wiphy.dev);
 558         if (res) {
 559                 mutex_unlock(&cfg80211_mutex);
 560                 return res;
 561         }
 562
 563         /* set up regulatory info */
 564         wiphy_regulatory_register(wiphy);
 565
 566         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 567         cfg80211_rdev_list_generation++;
 568
 569         /* add to debugfs */
 570         rdev->wiphy.debugfsdir =
 571                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 572                                    ieee80211_debugfs_dir);
 573         if (IS_ERR(rdev->wiphy.debugfsdir))
 574                 rdev->wiphy.debugfsdir = NULL;
 575
 576         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
 577                 struct regulatory_request request;
 578
 579                 request.wiphy_idx = get_wiphy_idx(wiphy);
 580                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 581                 request.alpha2[0] = '9';
 582                 request.alpha2[1] = '9';
 583
 584                 nl80211_send_reg_change_event(&request);
 585         }
 586
 587         cfg80211_debugfs_rdev_add(rdev);
 588         mutex_unlock(&cfg80211_mutex);
 589
 590         /*
 591          * due to a locking dependency this has to be outside of the
 592          * cfg80211_mutex lock
 593          */
 594         res = rfkill_register(rdev->rfkill);
 595         if (res)
 596                 goto out_rm_dev;
 597
 598         rtnl_lock();
 599         rdev->wiphy.registered = true;
 600         rtnl_unlock();
 601         return 0;
 602
 603 out_rm_dev:
 604         device_del(&rdev->wiphy.dev);
 605         return res;
 606 }
 607 EXPORT_SYMBOL(wiphy_register);
 608
 609 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 610 {
 611         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 612
 613         if (!rdev->ops->rfkill_poll)
 614                 return;
 615         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 616         rfkill_resume_polling(rdev->rfkill);
 617 }
 618 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 619
 620 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 621 {
 622         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 623
 624         rfkill_pause_polling(rdev->rfkill);
 625 }
 626 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 627
 628 void wiphy_unregister(struct wiphy *wiphy)
 629 {
 630         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 631
 632         rtnl_lock();
 633         rdev->wiphy.registered = false;
 634         rtnl_unlock();
 635
 636         rfkill_unregister(rdev->rfkill);
 637
 638         /* protect the device list */
 639         mutex_lock(&cfg80211_mutex);
 640
 641         wait_event(rdev->dev_wait, ({
 642                 int __count;
 643                 mutex_lock(&rdev->devlist_mtx);
 644                 __count = rdev->opencount;
 645                 mutex_unlock(&rdev->devlist_mtx);
 646                 __count == 0; }));
 647
 648         mutex_lock(&rdev->devlist_mtx);
 649         BUG_ON(!list_empty(&rdev->wdev_list));
 650         mutex_unlock(&rdev->devlist_mtx);
 651
 652         /*
 653          * First remove the hardware from everywhere, this makes
 654          * it impossible to find from userspace.
 655          */
 656         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 657         list_del_rcu(&rdev->list);
 658         synchronize_rcu();
 659
 660         /*
 661          * Try to grab rdev->mtx. If a command is still in progress,
 662          * hopefully the driver will refuse it since it's tearing
 663          * down the device already. We wait for this command to complete
 664          * before unlinking the item from the list.
 665          * Note: as codified by the BUG_ON above we cannot get here if
 666          * a virtual interface is still present. Hence, we can only get
 667          * to lock contention here if userspace issues a command that
 668          * identified the hardware by wiphy index.
 669          */
 670         cfg80211_lock_rdev(rdev);
 671         /* nothing */
 672         cfg80211_unlock_rdev(rdev);
 673
 674         /*
 675          * If this device got a regulatory hint tell core its
 676          * free to listen now to a new shiny device regulatory hint
 677          */
 678         wiphy_regulatory_deregister(wiphy);
 679
 680         cfg80211_rdev_list_generation++;
 681         device_del(&rdev->wiphy.dev);
 682
 683         mutex_unlock(&cfg80211_mutex);
 684
 685         flush_work(&rdev->scan_done_wk);
 686         cancel_work_sync(&rdev->conn_work);
 687         flush_work(&rdev->event_work);
 688
 689         if (rdev->wowlan && rdev->ops->set_wakeup)
 690                 rdev->ops->set_wakeup(&rdev->wiphy, false);
 691         cfg80211_rdev_free_wowlan(rdev);
 692 }
 693 EXPORT_SYMBOL(wiphy_unregister);
 694
 695 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 696 {
 697         struct cfg80211_internal_bss *scan, *tmp;
 698         rfkill_destroy(rdev->rfkill);
 699         mutex_destroy(&rdev->mtx);
 700         mutex_destroy(&rdev->devlist_mtx);
 701         mutex_destroy(&rdev->sched_scan_mtx);
 702         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 703                 cfg80211_put_bss(&scan->pub);
 704         kfree(rdev);
 705 }
 706
 707 void wiphy_free(struct wiphy *wiphy)
 708 {
 709         put_device(&wiphy->dev);
 710 }
 711 EXPORT_SYMBOL(wiphy_free);
 712
 713 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 714 {
 715         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 716
 717         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 718                 schedule_work(&rdev->rfkill_sync);
 719 }
 720 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 721
 722 static void wdev_cleanup_work(struct work_struct *work)
 723 {
 724         struct wireless_dev *wdev;
 725         struct cfg80211_registered_device *rdev;
 726
 727         wdev = container_of(work, struct wireless_dev, cleanup_work);
 728         rdev = wiphy_to_dev(wdev->wiphy);
 729
 730         cfg80211_lock_rdev(rdev);
 731
 732         if (WARN_ON(rdev->scan_req && rdev->scan_req->wdev == wdev)) {
 733                 rdev->scan_req->aborted = true;
 734                 ___cfg80211_scan_done(rdev, true);
 735         }
 736
 737         cfg80211_unlock_rdev(rdev);
 738
 739         mutex_lock(&rdev->sched_scan_mtx);
 740
 741         if (WARN_ON(rdev->sched_scan_req &&
 742                     rdev->sched_scan_req->dev == wdev->netdev)) {
 743                 __cfg80211_stop_sched_scan(rdev, false);
 744         }
 745
 746         mutex_unlock(&rdev->sched_scan_mtx);
 747
 748         mutex_lock(&rdev->devlist_mtx);
 749         rdev->opencount--;
 750         mutex_unlock(&rdev->devlist_mtx);
 751         wake_up(&rdev->dev_wait);
 752
 753         dev_put(wdev->netdev);
 754 }
 755
 756 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 757 {
 758         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 759
 760         ASSERT_RTNL();
 761
 762         if (WARN_ON(wdev->netdev))
 763                 return;
 764
 765         mutex_lock(&rdev->devlist_mtx);
 766         list_del_rcu(&wdev->list);
 767         rdev->devlist_generation++;
 768
 769         switch (wdev->iftype) {
 770         case NL80211_IFTYPE_P2P_DEVICE:
 771                 if (!wdev->p2p_started)
 772                         break;
 773                 rdev->ops->stop_p2p_device(&rdev->wiphy, wdev);
 774                 wdev->p2p_started = false;
 775                 rdev->opencount--;
 776                 break;
 777         default:
 778                 WARN_ON_ONCE(1);
 779                 break;
 780         }
 781         mutex_unlock(&rdev->devlist_mtx);
 782 }
 783 EXPORT_SYMBOL(cfg80211_unregister_wdev);
 784
 785 static struct device_type wiphy_type = {
 786         .name   = "wlan",
 787 };
 788
 789 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 790                                enum nl80211_iftype iftype, int num)
 791 {
 792         ASSERT_RTNL();
 793
 794         rdev->num_running_ifaces += num;
 795         if (iftype == NL80211_IFTYPE_MONITOR)
 796                 rdev->num_running_monitor_ifaces += num;
 797 }
 798
 799 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 800                                          unsigned long state,
 801                                          void *ndev)
 802 {
 803         struct net_device *dev = ndev;
 804         struct wireless_dev *wdev = dev->ieee80211_ptr;
 805         struct cfg80211_registered_device *rdev;
 806         int ret;
 807
 808         if (!wdev)
 809                 return NOTIFY_DONE;
 810
 811         rdev = wiphy_to_dev(wdev->wiphy);
 812
 813         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 814
 815         switch (state) {
 816         case NETDEV_POST_INIT:
 817                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 818                 break;
 819         case NETDEV_REGISTER:
 820                 /*
 821                  * NB: cannot take rdev->mtx here because this may be
 822                  * called within code protected by it when interfaces
 823                  * are added with nl80211.
 824                  */
 825                 mutex_init(&wdev->mtx);
 826                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
 827                 INIT_LIST_HEAD(&wdev->event_list);
 828                 spin_lock_init(&wdev->event_lock);
 829                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
 830                 spin_lock_init(&wdev->mgmt_registrations_lock);
 831
 832                 mutex_lock(&rdev->devlist_mtx);
 833                 wdev->identifier = ++rdev->wdev_id;
 834                 list_add_rcu(&wdev->list, &rdev->wdev_list);
 835                 rdev->devlist_generation++;
 836                 /* can only change netns with wiphy */
 837                 dev->features |= NETIF_F_NETNS_LOCAL;
 838
 839                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 840                                       "phy80211")) {
 841                         pr_err("failed to add phy80211 symlink to netdev!\n");
 842                 }
 843                 wdev->netdev = dev;
 844                 wdev->sme_state = CFG80211_SME_IDLE;
 845                 mutex_unlock(&rdev->devlist_mtx);
 846 #ifdef CONFIG_CFG80211_WEXT
 847                 wdev->wext.default_key = -1;
 848                 wdev->wext.default_mgmt_key = -1;
 849                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 850 #endif
 851
 852                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
 853                         wdev->ps = true;
 854                 else
 855                         wdev->ps = false;
 856                 /* allow mac80211 to determine the timeout */
 857                 wdev->ps_timeout = -1;
 858
 859                 if (!dev->ethtool_ops)
 860                         dev->ethtool_ops = &cfg80211_ethtool_ops;
 861
 862                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 863                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
 864                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
 865                         dev->priv_flags |= IFF_DONT_BRIDGE;
 866                 break;
 867         case NETDEV_GOING_DOWN:
 868                 switch (wdev->iftype) {
 869                 case NL80211_IFTYPE_ADHOC:
 870                         cfg80211_leave_ibss(rdev, dev, true);
 871                         break;
 872                 case NL80211_IFTYPE_P2P_CLIENT:
 873                 case NL80211_IFTYPE_STATION:
 874                         mutex_lock(&rdev->sched_scan_mtx);
 875                         __cfg80211_stop_sched_scan(rdev, false);
 876                         mutex_unlock(&rdev->sched_scan_mtx);
 877
 878                         wdev_lock(wdev);
 879 #ifdef CONFIG_CFG80211_WEXT
 880                         kfree(wdev->wext.ie);
 881                         wdev->wext.ie = NULL;
 882                         wdev->wext.ie_len = 0;
 883                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 884 #endif
 885                         __cfg80211_disconnect(rdev, dev,
 886                                               WLAN_REASON_DEAUTH_LEAVING, true);
 887                         cfg80211_mlme_down(rdev, dev);
 888                         wdev_unlock(wdev);
 889                         break;
 890                 case NL80211_IFTYPE_MESH_POINT:
 891                         cfg80211_leave_mesh(rdev, dev);
 892                         break;
 893                 case NL80211_IFTYPE_AP:
 894                         cfg80211_stop_ap(rdev, dev);
 895                         break;
 896                 default:
 897                         break;
 898                 }
 899                 wdev->beacon_interval = 0;
 900                 break;
 901         case NETDEV_DOWN:
 902                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
 903                 dev_hold(dev);
 904                 queue_work(cfg80211_wq, &wdev->cleanup_work);
 905                 break;
 906         case NETDEV_UP:
 907                 /*
 908                  * If we have a really quick DOWN/UP succession we may
 909                  * have this work still pending ... cancel it and see
 910                  * if it was pending, in which case we need to account
 911                  * for some of the work it would have done.
 912                  */
 913                 if (cancel_work_sync(&wdev->cleanup_work)) {
 914                         mutex_lock(&rdev->devlist_mtx);
 915                         rdev->opencount--;
 916                         mutex_unlock(&rdev->devlist_mtx);
 917                         dev_put(dev);
 918                 }
 919                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
 920                 cfg80211_lock_rdev(rdev);
 921                 mutex_lock(&rdev->devlist_mtx);
 922                 wdev_lock(wdev);
 923                 switch (wdev->iftype) {
 924 #ifdef CONFIG_CFG80211_WEXT
 925                 case NL80211_IFTYPE_ADHOC:
 926                         cfg80211_ibss_wext_join(rdev, wdev);
 927                         break;
 928                 case NL80211_IFTYPE_STATION:
 929                         cfg80211_mgd_wext_connect(rdev, wdev);
 930                         break;
 931 #endif
 932 #ifdef CONFIG_MAC80211_MESH
 933                 case NL80211_IFTYPE_MESH_POINT:
 934                         {
 935                                 /* backward compat code... */
 936                                 struct mesh_setup setup;
 937                                 memcpy(&setup, &default_mesh_setup,
 938                                                 sizeof(setup));
 939                                  /* back compat only needed for mesh_id */
 940                                 setup.mesh_id = wdev->ssid;
 941                                 setup.mesh_id_len = wdev->mesh_id_up_len;
 942                                 if (wdev->mesh_id_up_len)
 943                                         __cfg80211_join_mesh(rdev, dev,
 944                                                         &setup,
 945                                                         &default_mesh_config);
 946                                 break;
 947                         }
 948 #endif
 949                 default:
 950                         break;
 951                 }
 952                 wdev_unlock(wdev);
 953                 rdev->opencount++;
 954                 mutex_unlock(&rdev->devlist_mtx);
 955                 cfg80211_unlock_rdev(rdev);
 956
 957                 /*
 958                  * Configure power management to the driver here so that its
 959                  * correctly set also after interface type changes etc.
 960                  */
 961                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 962                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
 963                     rdev->ops->set_power_mgmt)
 964                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
 965                                                       wdev->ps,
 966                                                       wdev->ps_timeout)) {
 967                                 /* assume this means it's off */
 968                                 wdev->ps = false;
 969                         }
 970                 break;
 971         case NETDEV_UNREGISTER:
 972                 /*
 973                  * NB: cannot take rdev->mtx here because this may be
 974                  * called within code protected by it when interfaces
 975                  * are removed with nl80211.
 976                  */
 977                 mutex_lock(&rdev->devlist_mtx);
 978                 /*
 979                  * It is possible to get NETDEV_UNREGISTER
 980                  * multiple times. To detect that, check
 981                  * that the interface is still on the list
 982                  * of registered interfaces, and only then
 983                  * remove and clean it up.
 984                  */
 985                 if (!list_empty(&wdev->list)) {
 986                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 987                         list_del_rcu(&wdev->list);
 988                         rdev->devlist_generation++;
 989                         cfg80211_mlme_purge_registrations(wdev);
 990 #ifdef CONFIG_CFG80211_WEXT
 991                         kfree(wdev->wext.keys);
 992 #endif
 993                 }
 994                 mutex_unlock(&rdev->devlist_mtx);
 995                 /*
 996                  * synchronise (so that we won't find this netdev
 997                  * from other code any more) and then clear the list
 998                  * head so that the above code can safely check for
 999                  * !list_empty() to avoid double-cleanup.
1000                  */
1001                 synchronize_rcu();
1002                 INIT_LIST_HEAD(&wdev->list);
1003                 /*
1004                  * Ensure that all events have been processed and
1005                  * freed.
1006                  */
1007                 cfg80211_process_wdev_events(wdev);
1008                 break;
1009         case NETDEV_PRE_UP:
1010                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1011                         return notifier_from_errno(-EOPNOTSUPP);
1012                 if (rfkill_blocked(rdev->rfkill))
1013                         return notifier_from_errno(-ERFKILL);
1014                 mutex_lock(&rdev->devlist_mtx);
1015                 ret = cfg80211_can_add_interface(rdev, wdev->iftype);
1016                 mutex_unlock(&rdev->devlist_mtx);
1017                 if (ret)
1018                         return notifier_from_errno(ret);
1019                 break;
1020         }
1021
1022         return NOTIFY_DONE;
1023 }
1024
1025 static struct notifier_block cfg80211_netdev_notifier = {
1026         .notifier_call = cfg80211_netdev_notifier_call,
1027 };
1028
1029 static void __net_exit cfg80211_pernet_exit(struct net *net)
1030 {
1031         struct cfg80211_registered_device *rdev;
1032
1033         rtnl_lock();
1034         mutex_lock(&cfg80211_mutex);
1035         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1036                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1037                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1038         }
1039         mutex_unlock(&cfg80211_mutex);
1040         rtnl_unlock();
1041 }
1042
1043 static struct pernet_operations cfg80211_pernet_ops = {
1044         .exit = cfg80211_pernet_exit,
1045 };
1046
1047 static int __init cfg80211_init(void)
1048 {
1049         int err;
1050
1051         err = register_pernet_device(&cfg80211_pernet_ops);
1052         if (err)
1053                 goto out_fail_pernet;
1054
1055         err = wiphy_sysfs_init();
1056         if (err)
1057                 goto out_fail_sysfs;
1058
1059         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1060         if (err)
1061                 goto out_fail_notifier;
1062
1063         err = nl80211_init();
1064         if (err)
1065                 goto out_fail_nl80211;
1066
1067         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1068
1069         err = regulatory_init();
1070         if (err)
1071                 goto out_fail_reg;
1072
1073         cfg80211_wq = create_singlethread_workqueue("cfg80211");
1074         if (!cfg80211_wq)
1075                 goto out_fail_wq;
1076
1077         return 0;
1078
1079 out_fail_wq:
1080         regulatory_exit();
1081 out_fail_reg:
1082         debugfs_remove(ieee80211_debugfs_dir);
1083 out_fail_nl80211:
1084         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1085 out_fail_notifier:
1086         wiphy_sysfs_exit();
1087 out_fail_sysfs:
1088         unregister_pernet_device(&cfg80211_pernet_ops);
1089 out_fail_pernet:
1090         return err;
1091 }
1092 subsys_initcall(cfg80211_init);
1093
1094 static void __exit cfg80211_exit(void)
1095 {
1096         debugfs_remove(ieee80211_debugfs_dir);
1097         nl80211_exit();
1098         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1099         wiphy_sysfs_exit();
1100         regulatory_exit();
1101         unregister_pernet_device(&cfg80211_pernet_ops);
1102         destroy_workqueue(cfg80211_wq);
1103 }
1104 module_exit(cfg80211_exit);