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                 /*
 377                  * Put a sane limit on maximum number of different
 378                  * channels to simplify channel accounting code.
 379                  */
 380                 if (WARN_ON(c->num_different_channels >
 381                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 382                         return -EINVAL;
 383
 384                 if (WARN_ON(!c->n_limits))
 385                         return -EINVAL;
 386
 387                 for (j = 0; j < c->n_limits; j++) {
 388                         u16 types = c->limits[j].types;
 389
 390                         /*
 391                          * interface types shouldn't overlap, this is
 392                          * used in cfg80211_can_change_interface()
 393                          */
 394                         if (WARN_ON(types & all_iftypes))
 395                                 return -EINVAL;
 396                         all_iftypes |= types;
 397
 398                         if (WARN_ON(!c->limits[j].max))
 399                                 return -EINVAL;
 400
 401                         /* Shouldn't list software iftypes in combinations! */
 402                         if (WARN_ON(wiphy->software_iftypes & types))
 403                                 return -EINVAL;
 404
 405                         cnt += c->limits[j].max;
 406                         /*
 407                          * Don't advertise an unsupported type
 408                          * in a combination.
 409                          */
 410                         if (WARN_ON((wiphy->interface_modes & types) != types))
 411                                 return -EINVAL;
 412                 }
 413
 414                 /* You can't even choose that many! */
 415                 if (WARN_ON(cnt < c->max_interfaces))
 416                         return -EINVAL;
 417         }
 418
 419         return 0;
 420 }
 421
 422 int wiphy_register(struct wiphy *wiphy)
 423 {
 424         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 425         int res;
 426         enum ieee80211_band band;
 427         struct ieee80211_supported_band *sband;
 428         bool have_band = false;
 429         int i;
 430         u16 ifmodes = wiphy->interface_modes;
 431
 432 #ifdef CONFIG_PM
 433         if (WARN_ON((wiphy->wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 434                     !(wiphy->wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 435                 return -EINVAL;
 436 #endif
 437
 438         if (WARN_ON(wiphy->ap_sme_capa &&
 439                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 440                 return -EINVAL;
 441
 442         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 443                 return -EINVAL;
 444
 445         if (WARN_ON(wiphy->addresses &&
 446                     !is_zero_ether_addr(wiphy->perm_addr) &&
 447                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 448                            ETH_ALEN)))
 449                 return -EINVAL;
 450
 451         if (wiphy->addresses)
 452                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 453
 454         /* sanity check ifmodes */
 455         WARN_ON(!ifmodes);
 456         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 457         if (WARN_ON(ifmodes != wiphy->interface_modes))
 458                 wiphy->interface_modes = ifmodes;
 459
 460         res = wiphy_verify_combinations(wiphy);
 461         if (res)
 462                 return res;
 463
 464         /* sanity check supported bands/channels */
 465         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 466                 sband = wiphy->bands[band];
 467                 if (!sband)
 468                         continue;
 469
 470                 sband->band = band;
 471
 472                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
 473                         return -EINVAL;
 474
 475                 /*
 476                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 477                  * modify the sband's ht data even if the driver uses a
 478                  * global structure for that.
 479                  */
 480                 if (cfg80211_disable_40mhz_24ghz &&
 481                     band == IEEE80211_BAND_2GHZ &&
 482                     sband->ht_cap.ht_supported) {
 483                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 484                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 485                 }
 486
 487                 /*
 488                  * Since we use a u32 for rate bitmaps in
 489                  * ieee80211_get_response_rate, we cannot
 490                  * have more than 32 legacy rates.
 491                  */
 492                 if (WARN_ON(sband->n_bitrates > 32))
 493                         return -EINVAL;
 494
 495                 for (i = 0; i < sband->n_channels; i++) {
 496                         sband->channels[i].orig_flags =
 497                                 sband->channels[i].flags;
 498                         sband->channels[i].orig_mag =
 499                                 sband->channels[i].max_antenna_gain;
 500                         sband->channels[i].orig_mpwr =
 501                                 sband->channels[i].max_power;
 502                         sband->channels[i].band = band;
 503                 }
 504
 505                 have_band = true;
 506         }
 507
 508         if (!have_band) {
 509                 WARN_ON(1);
 510                 return -EINVAL;
 511         }
 512
 513 #ifdef CONFIG_PM
 514         if (rdev->wiphy.wowlan.n_patterns) {
 515                 if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len ||
 516                             rdev->wiphy.wowlan.pattern_min_len >
 517                             rdev->wiphy.wowlan.pattern_max_len))
 518                         return -EINVAL;
 519         }
 520 #endif
 521
 522         /* check and set up bitrates */
 523         ieee80211_set_bitrate_flags(wiphy);
 524
 525         mutex_lock(&cfg80211_mutex);
 526
 527         res = device_add(&rdev->wiphy.dev);
 528         if (res) {
 529                 mutex_unlock(&cfg80211_mutex);
 530                 return res;
 531         }
 532
 533         /* set up regulatory info */
 534         regulatory_update(wiphy, NL80211_REGDOM_SET_BY_CORE);
 535
 536         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 537         cfg80211_rdev_list_generation++;
 538
 539         /* add to debugfs */
 540         rdev->wiphy.debugfsdir =
 541                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 542                                    ieee80211_debugfs_dir);
 543         if (IS_ERR(rdev->wiphy.debugfsdir))
 544                 rdev->wiphy.debugfsdir = NULL;
 545
 546         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
 547                 struct regulatory_request request;
 548
 549                 request.wiphy_idx = get_wiphy_idx(wiphy);
 550                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 551                 request.alpha2[0] = '9';
 552                 request.alpha2[1] = '9';
 553
 554                 nl80211_send_reg_change_event(&request);
 555         }
 556
 557         cfg80211_debugfs_rdev_add(rdev);
 558         mutex_unlock(&cfg80211_mutex);
 559
 560         /*
 561          * due to a locking dependency this has to be outside of the
 562          * cfg80211_mutex lock
 563          */
 564         res = rfkill_register(rdev->rfkill);
 565         if (res)
 566                 goto out_rm_dev;
 567
 568         rtnl_lock();
 569         rdev->wiphy.registered = true;
 570         rtnl_unlock();
 571         return 0;
 572
 573 out_rm_dev:
 574         device_del(&rdev->wiphy.dev);
 575         return res;
 576 }
 577 EXPORT_SYMBOL(wiphy_register);
 578
 579 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 580 {
 581         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 582
 583         if (!rdev->ops->rfkill_poll)
 584                 return;
 585         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 586         rfkill_resume_polling(rdev->rfkill);
 587 }
 588 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 589
 590 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 591 {
 592         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 593
 594         rfkill_pause_polling(rdev->rfkill);
 595 }
 596 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 597
 598 void wiphy_unregister(struct wiphy *wiphy)
 599 {
 600         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 601
 602         rtnl_lock();
 603         rdev->wiphy.registered = false;
 604         rtnl_unlock();
 605
 606         rfkill_unregister(rdev->rfkill);
 607
 608         /* protect the device list */
 609         mutex_lock(&cfg80211_mutex);
 610
 611         wait_event(rdev->dev_wait, ({
 612                 int __count;
 613                 mutex_lock(&rdev->devlist_mtx);
 614                 __count = rdev->opencount;
 615                 mutex_unlock(&rdev->devlist_mtx);
 616                 __count == 0; }));
 617
 618         mutex_lock(&rdev->devlist_mtx);
 619         BUG_ON(!list_empty(&rdev->netdev_list));
 620         mutex_unlock(&rdev->devlist_mtx);
 621
 622         /*
 623          * First remove the hardware from everywhere, this makes
 624          * it impossible to find from userspace.
 625          */
 626         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 627         list_del_rcu(&rdev->list);
 628         synchronize_rcu();
 629
 630         /*
 631          * Try to grab rdev->mtx. If a command is still in progress,
 632          * hopefully the driver will refuse it since it's tearing
 633          * down the device already. We wait for this command to complete
 634          * before unlinking the item from the list.
 635          * Note: as codified by the BUG_ON above we cannot get here if
 636          * a virtual interface is still present. Hence, we can only get
 637          * to lock contention here if userspace issues a command that
 638          * identified the hardware by wiphy index.
 639          */
 640         cfg80211_lock_rdev(rdev);
 641         /* nothing */
 642         cfg80211_unlock_rdev(rdev);
 643
 644         /* If this device got a regulatory hint tell core its
 645          * free to listen now to a new shiny device regulatory hint */
 646         reg_device_remove(wiphy);
 647
 648         cfg80211_rdev_list_generation++;
 649         device_del(&rdev->wiphy.dev);
 650
 651         mutex_unlock(&cfg80211_mutex);
 652
 653         flush_work(&rdev->scan_done_wk);
 654         cancel_work_sync(&rdev->conn_work);
 655         flush_work(&rdev->event_work);
 656
 657         if (rdev->wowlan && rdev->ops->set_wakeup)
 658                 rdev->ops->set_wakeup(&rdev->wiphy, false);
 659         cfg80211_rdev_free_wowlan(rdev);
 660 }
 661 EXPORT_SYMBOL(wiphy_unregister);
 662
 663 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 664 {
 665         struct cfg80211_internal_bss *scan, *tmp;
 666         rfkill_destroy(rdev->rfkill);
 667         mutex_destroy(&rdev->mtx);
 668         mutex_destroy(&rdev->devlist_mtx);
 669         mutex_destroy(&rdev->sched_scan_mtx);
 670         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 671                 cfg80211_put_bss(&scan->pub);
 672         kfree(rdev);
 673 }
 674
 675 void wiphy_free(struct wiphy *wiphy)
 676 {
 677         put_device(&wiphy->dev);
 678 }
 679 EXPORT_SYMBOL(wiphy_free);
 680
 681 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 682 {
 683         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 684
 685         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 686                 schedule_work(&rdev->rfkill_sync);
 687 }
 688 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 689
 690 static void wdev_cleanup_work(struct work_struct *work)
 691 {
 692         struct wireless_dev *wdev;
 693         struct cfg80211_registered_device *rdev;
 694
 695         wdev = container_of(work, struct wireless_dev, cleanup_work);
 696         rdev = wiphy_to_dev(wdev->wiphy);
 697
 698         cfg80211_lock_rdev(rdev);
 699
 700         if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
 701                 rdev->scan_req->aborted = true;
 702                 ___cfg80211_scan_done(rdev, true);
 703         }
 704
 705         cfg80211_unlock_rdev(rdev);
 706
 707         mutex_lock(&rdev->sched_scan_mtx);
 708
 709         if (WARN_ON(rdev->sched_scan_req &&
 710                     rdev->sched_scan_req->dev == wdev->netdev)) {
 711                 __cfg80211_stop_sched_scan(rdev, false);
 712         }
 713
 714         mutex_unlock(&rdev->sched_scan_mtx);
 715
 716         mutex_lock(&rdev->devlist_mtx);
 717         rdev->opencount--;
 718         mutex_unlock(&rdev->devlist_mtx);
 719         wake_up(&rdev->dev_wait);
 720
 721         dev_put(wdev->netdev);
 722 }
 723
 724 static struct device_type wiphy_type = {
 725         .name   = "wlan",
 726 };
 727
 728 static struct ieee80211_channel *
 729 cfg80211_get_any_chan(struct cfg80211_registered_device *rdev)
 730 {
 731         struct ieee80211_supported_band *sband;
 732         int i;
 733
 734         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
 735                 sband = rdev->wiphy.bands[i];
 736                 if (sband && sband->n_channels > 0)
 737                         return &sband->channels[0];
 738         }
 739
 740         return NULL;
 741 }
 742
 743 static void cfg80211_init_mon_chan(struct cfg80211_registered_device *rdev)
 744 {
 745         struct ieee80211_channel *chan;
 746
 747         chan = cfg80211_get_any_chan(rdev);
 748         if (WARN_ON(!chan))
 749                 return;
 750
 751         mutex_lock(&rdev->devlist_mtx);
 752         WARN_ON(cfg80211_set_monitor_channel(rdev, chan->center_freq,
 753                                              NL80211_CHAN_NO_HT));
 754         mutex_unlock(&rdev->devlist_mtx);
 755 }
 756
 757 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 758                                enum nl80211_iftype iftype, int num)
 759 {
 760         bool has_monitors_only_old = cfg80211_has_monitors_only(rdev);
 761         bool has_monitors_only_new;
 762
 763         ASSERT_RDEV_LOCK(rdev);
 764
 765         rdev->num_running_ifaces += num;
 766         if (iftype == NL80211_IFTYPE_MONITOR)
 767                 rdev->num_running_monitor_ifaces += num;
 768
 769         has_monitors_only_new = cfg80211_has_monitors_only(rdev);
 770         if (has_monitors_only_new != has_monitors_only_old) {
 771                 rdev->ops->set_monitor_enabled(&rdev->wiphy,
 772                                                has_monitors_only_new);
 773
 774                 if (!has_monitors_only_new) {
 775                         rdev->monitor_channel = NULL;
 776                         rdev->monitor_channel_type = NL80211_CHAN_NO_HT;
 777                 } else {
 778                         cfg80211_init_mon_chan(rdev);
 779                 }
 780         }
 781 }
 782
 783 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 784                                          unsigned long state,
 785                                          void *ndev)
 786 {
 787         struct net_device *dev = ndev;
 788         struct wireless_dev *wdev = dev->ieee80211_ptr;
 789         struct cfg80211_registered_device *rdev;
 790         int ret;
 791
 792         if (!wdev)
 793                 return NOTIFY_DONE;
 794
 795         rdev = wiphy_to_dev(wdev->wiphy);
 796
 797         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 798
 799         switch (state) {
 800         case NETDEV_POST_INIT:
 801                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 802                 break;
 803         case NETDEV_REGISTER:
 804                 /*
 805                  * NB: cannot take rdev->mtx here because this may be
 806                  * called within code protected by it when interfaces
 807                  * are added with nl80211.
 808                  */
 809                 mutex_init(&wdev->mtx);
 810                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
 811                 INIT_LIST_HEAD(&wdev->event_list);
 812                 spin_lock_init(&wdev->event_lock);
 813                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
 814                 spin_lock_init(&wdev->mgmt_registrations_lock);
 815
 816                 mutex_lock(&rdev->devlist_mtx);
 817                 list_add_rcu(&wdev->list, &rdev->netdev_list);
 818                 rdev->devlist_generation++;
 819                 /* can only change netns with wiphy */
 820                 dev->features |= NETIF_F_NETNS_LOCAL;
 821
 822                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 823                                       "phy80211")) {
 824                         pr_err("failed to add phy80211 symlink to netdev!\n");
 825                 }
 826                 wdev->netdev = dev;
 827                 wdev->sme_state = CFG80211_SME_IDLE;
 828                 mutex_unlock(&rdev->devlist_mtx);
 829 #ifdef CONFIG_CFG80211_WEXT
 830                 wdev->wext.default_key = -1;
 831                 wdev->wext.default_mgmt_key = -1;
 832                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 833 #endif
 834
 835                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
 836                         wdev->ps = true;
 837                 else
 838                         wdev->ps = false;
 839                 /* allow mac80211 to determine the timeout */
 840                 wdev->ps_timeout = -1;
 841
 842                 if (!dev->ethtool_ops)
 843                         dev->ethtool_ops = &cfg80211_ethtool_ops;
 844
 845                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 846                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
 847                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
 848                         dev->priv_flags |= IFF_DONT_BRIDGE;
 849                 break;
 850         case NETDEV_GOING_DOWN:
 851                 switch (wdev->iftype) {
 852                 case NL80211_IFTYPE_ADHOC:
 853                         cfg80211_leave_ibss(rdev, dev, true);
 854                         break;
 855                 case NL80211_IFTYPE_P2P_CLIENT:
 856                 case NL80211_IFTYPE_STATION:
 857                         mutex_lock(&rdev->sched_scan_mtx);
 858                         __cfg80211_stop_sched_scan(rdev, false);
 859                         mutex_unlock(&rdev->sched_scan_mtx);
 860
 861                         wdev_lock(wdev);
 862 #ifdef CONFIG_CFG80211_WEXT
 863                         kfree(wdev->wext.ie);
 864                         wdev->wext.ie = NULL;
 865                         wdev->wext.ie_len = 0;
 866                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 867 #endif
 868                         __cfg80211_disconnect(rdev, dev,
 869                                               WLAN_REASON_DEAUTH_LEAVING, true);
 870                         cfg80211_mlme_down(rdev, dev);
 871                         wdev_unlock(wdev);
 872                         break;
 873                 case NL80211_IFTYPE_MESH_POINT:
 874                         cfg80211_leave_mesh(rdev, dev);
 875                         break;
 876                 case NL80211_IFTYPE_AP:
 877                         cfg80211_stop_ap(rdev, dev);
 878                         break;
 879                 default:
 880                         break;
 881                 }
 882                 wdev->beacon_interval = 0;
 883                 break;
 884         case NETDEV_DOWN:
 885                 dev_hold(dev);
 886                 cfg80211_lock_rdev(rdev);
 887                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
 888                 cfg80211_unlock_rdev(rdev);
 889                 queue_work(cfg80211_wq, &wdev->cleanup_work);
 890                 break;
 891         case NETDEV_UP:
 892                 /*
 893                  * If we have a really quick DOWN/UP succession we may
 894                  * have this work still pending ... cancel it and see
 895                  * if it was pending, in which case we need to account
 896                  * for some of the work it would have done.
 897                  */
 898                 if (cancel_work_sync(&wdev->cleanup_work)) {
 899                         mutex_lock(&rdev->devlist_mtx);
 900                         rdev->opencount--;
 901                         mutex_unlock(&rdev->devlist_mtx);
 902                         dev_put(dev);
 903                 }
 904                 cfg80211_lock_rdev(rdev);
 905                 mutex_lock(&rdev->devlist_mtx);
 906                 wdev_lock(wdev);
 907                 switch (wdev->iftype) {
 908 #ifdef CONFIG_CFG80211_WEXT
 909                 case NL80211_IFTYPE_ADHOC:
 910                         cfg80211_ibss_wext_join(rdev, wdev);
 911                         break;
 912                 case NL80211_IFTYPE_STATION:
 913                         cfg80211_mgd_wext_connect(rdev, wdev);
 914                         break;
 915 #endif
 916 #ifdef CONFIG_MAC80211_MESH
 917                 case NL80211_IFTYPE_MESH_POINT:
 918                         {
 919                                 /* backward compat code... */
 920                                 struct mesh_setup setup;
 921                                 memcpy(&setup, &default_mesh_setup,
 922                                                 sizeof(setup));
 923                                  /* back compat only needed for mesh_id */
 924                                 setup.mesh_id = wdev->ssid;
 925                                 setup.mesh_id_len = wdev->mesh_id_up_len;
 926                                 if (wdev->mesh_id_up_len)
 927                                         __cfg80211_join_mesh(rdev, dev,
 928                                                         &setup,
 929                                                         &default_mesh_config);
 930                                 break;
 931                         }
 932 #endif
 933                 default:
 934                         break;
 935                 }
 936                 wdev_unlock(wdev);
 937                 rdev->opencount++;
 938                 mutex_unlock(&rdev->devlist_mtx);
 939                 cfg80211_unlock_rdev(rdev);
 940
 941                 /*
 942                  * Configure power management to the driver here so that its
 943                  * correctly set also after interface type changes etc.
 944                  */
 945                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 946                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
 947                     rdev->ops->set_power_mgmt)
 948                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
 949                                                       wdev->ps,
 950                                                       wdev->ps_timeout)) {
 951                                 /* assume this means it's off */
 952                                 wdev->ps = false;
 953                         }
 954                 break;
 955         case NETDEV_UNREGISTER:
 956                 /*
 957                  * NB: cannot take rdev->mtx here because this may be
 958                  * called within code protected by it when interfaces
 959                  * are removed with nl80211.
 960                  */
 961                 mutex_lock(&rdev->devlist_mtx);
 962                 /*
 963                  * It is possible to get NETDEV_UNREGISTER
 964                  * multiple times. To detect that, check
 965                  * that the interface is still on the list
 966                  * of registered interfaces, and only then
 967                  * remove and clean it up.
 968                  */
 969                 if (!list_empty(&wdev->list)) {
 970                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 971                         list_del_rcu(&wdev->list);
 972                         rdev->devlist_generation++;
 973                         cfg80211_mlme_purge_registrations(wdev);
 974 #ifdef CONFIG_CFG80211_WEXT
 975                         kfree(wdev->wext.keys);
 976 #endif
 977                 }
 978                 mutex_unlock(&rdev->devlist_mtx);
 979                 /*
 980                  * synchronise (so that we won't find this netdev
 981                  * from other code any more) and then clear the list
 982                  * head so that the above code can safely check for
 983                  * !list_empty() to avoid double-cleanup.
 984                  */
 985                 synchronize_rcu();
 986                 INIT_LIST_HEAD(&wdev->list);
 987                 break;
 988         case NETDEV_PRE_UP:
 989                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 990                         return notifier_from_errno(-EOPNOTSUPP);
 991                 if (rfkill_blocked(rdev->rfkill))
 992                         return notifier_from_errno(-ERFKILL);
 993                 ret = cfg80211_can_add_interface(rdev, wdev->iftype);
 994                 if (ret)
 995                         return notifier_from_errno(ret);
 996                 cfg80211_lock_rdev(rdev);
 997                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
 998                 cfg80211_unlock_rdev(rdev);
 999                 break;
1000         }
1001
1002         return NOTIFY_DONE;
1003 }
1004
1005 static struct notifier_block cfg80211_netdev_notifier = {
1006         .notifier_call = cfg80211_netdev_notifier_call,
1007 };
1008
1009 static void __net_exit cfg80211_pernet_exit(struct net *net)
1010 {
1011         struct cfg80211_registered_device *rdev;
1012
1013         rtnl_lock();
1014         mutex_lock(&cfg80211_mutex);
1015         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1016                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1017                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1018         }
1019         mutex_unlock(&cfg80211_mutex);
1020         rtnl_unlock();
1021 }
1022
1023 static struct pernet_operations cfg80211_pernet_ops = {
1024         .exit = cfg80211_pernet_exit,
1025 };
1026
1027 static int __init cfg80211_init(void)
1028 {
1029         int err;
1030
1031         err = register_pernet_device(&cfg80211_pernet_ops);
1032         if (err)
1033                 goto out_fail_pernet;
1034
1035         err = wiphy_sysfs_init();
1036         if (err)
1037                 goto out_fail_sysfs;
1038
1039         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1040         if (err)
1041                 goto out_fail_notifier;
1042
1043         err = nl80211_init();
1044         if (err)
1045                 goto out_fail_nl80211;
1046
1047         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1048
1049         err = regulatory_init();
1050         if (err)
1051                 goto out_fail_reg;
1052
1053         cfg80211_wq = create_singlethread_workqueue("cfg80211");
1054         if (!cfg80211_wq)
1055                 goto out_fail_wq;
1056
1057         return 0;
1058
1059 out_fail_wq:
1060         regulatory_exit();
1061 out_fail_reg:
1062         debugfs_remove(ieee80211_debugfs_dir);
1063 out_fail_nl80211:
1064         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1065 out_fail_notifier:
1066         wiphy_sysfs_exit();
1067 out_fail_sysfs:
1068         unregister_pernet_device(&cfg80211_pernet_ops);
1069 out_fail_pernet:
1070         return err;
1071 }
1072 subsys_initcall(cfg80211_init);
1073
1074 static void __exit cfg80211_exit(void)
1075 {
1076         debugfs_remove(ieee80211_debugfs_dir);
1077         nl80211_exit();
1078         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1079         wiphy_sysfs_exit();
1080         regulatory_exit();
1081         unregister_pernet_device(&cfg80211_pernet_ops);
1082         destroy_workqueue(cfg80211_wq);
1083 }
1084 module_exit(cfg80211_exit);