net/wireless/core.c

   1 /*
   2  * This is the linux wireless configuration interface.
   3  *
   4  * Copyright 2006-2010          Johannes Berg <johannes@sipsolutions.net>
   5  */
   6
   7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   8
   9 #include <linux/if.h>
  10 #include <linux/module.h>
  11 #include <linux/err.h>
  12 #include <linux/list.h>
  13 #include <linux/slab.h>
  14 #include <linux/nl80211.h>
  15 #include <linux/debugfs.h>
  16 #include <linux/notifier.h>
  17 #include <linux/device.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/sched.h>
  21 #include <net/genetlink.h>
  22 #include <net/cfg80211.h>
  23 #include "nl80211.h"
  24 #include "core.h"
  25 #include "sysfs.h"
  26 #include "debugfs.h"
  27 #include "wext-compat.h"
  28 #include "ethtool.h"
  29 #include "rdev-ops.h"
  30
  31 /* name for sysfs, %d is appended */
  32 #define PHY_NAME "phy"
  33
  34 MODULE_AUTHOR("Johannes Berg");
  35 MODULE_LICENSE("GPL");
  36 MODULE_DESCRIPTION("wireless configuration support");
  37
  38 /* RCU-protected (and cfg80211_mutex for writers) */
  39 LIST_HEAD(cfg80211_rdev_list);
  40 int cfg80211_rdev_list_generation;
  41
  42 DEFINE_MUTEX(cfg80211_mutex);
  43
  44 /* for debugfs */
  45 static struct dentry *ieee80211_debugfs_dir;
  46
  47 /* for the cleanup, scan and event works */
  48 struct workqueue_struct *cfg80211_wq;
  49
  50 static bool cfg80211_disable_40mhz_24ghz;
  51 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  52 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  53                  "Disable 40MHz support in the 2.4GHz band");
  54
  55 /* requires cfg80211_mutex to be held! */
  56 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  57 {
  58         struct cfg80211_registered_device *result = NULL, *rdev;
  59
  60         assert_cfg80211_lock();
  61
  62         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  63                 if (rdev->wiphy_idx == wiphy_idx) {
  64                         result = rdev;
  65                         break;
  66                 }
  67         }
  68
  69         return result;
  70 }
  71
  72 int get_wiphy_idx(struct wiphy *wiphy)
  73 {
  74         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
  75
  76         return rdev->wiphy_idx;
  77 }
  78
  79 /* requires cfg80211_rdev_mutex to be held! */
  80 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  81 {
  82         struct cfg80211_registered_device *rdev;
  83
  84         assert_cfg80211_lock();
  85
  86         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  87         if (!rdev)
  88                 return NULL;
  89         return &rdev->wiphy;
  90 }
  91
  92 struct cfg80211_registered_device *
  93 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
  94 {
  95         struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
  96         struct net_device *dev;
  97
  98         mutex_lock(&cfg80211_mutex);
  99         dev = dev_get_by_index(net, ifindex);
 100         if (!dev)
 101                 goto out;
 102         if (dev->ieee80211_ptr) {
 103                 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
 104                 mutex_lock(&rdev->mtx);
 105         } else
 106                 rdev = ERR_PTR(-ENODEV);
 107         dev_put(dev);
 108  out:
 109         mutex_unlock(&cfg80211_mutex);
 110         return rdev;
 111 }
 112
 113 /* requires cfg80211_mutex to be held */
 114 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 115                         char *newname)
 116 {
 117         struct cfg80211_registered_device *rdev2;
 118         int wiphy_idx, taken = -1, result, digits;
 119
 120         assert_cfg80211_lock();
 121
 122         /* prohibit calling the thing phy%d when %d is not its number */
 123         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 124         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 125                 /* count number of places needed to print wiphy_idx */
 126                 digits = 1;
 127                 while (wiphy_idx /= 10)
 128                         digits++;
 129                 /*
 130                  * deny the name if it is phy<idx> where <idx> is printed
 131                  * without leading zeroes. taken == strlen(newname) here
 132                  */
 133                 if (taken == strlen(PHY_NAME) + digits)
 134                         return -EINVAL;
 135         }
 136
 137
 138         /* Ignore nop renames */
 139         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
 140                 return 0;
 141
 142         /* Ensure another device does not already have this name. */
 143         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 144                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
 145                         return -EINVAL;
 146
 147         result = device_rename(&rdev->wiphy.dev, newname);
 148         if (result)
 149                 return result;
 150
 151         if (rdev->wiphy.debugfsdir &&
 152             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 153                             rdev->wiphy.debugfsdir,
 154                             rdev->wiphy.debugfsdir->d_parent,
 155                             newname))
 156                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 157
 158         nl80211_notify_dev_rename(rdev);
 159
 160         return 0;
 161 }
 162
 163 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 164                           struct net *net)
 165 {
 166         struct wireless_dev *wdev;
 167         int err = 0;
 168
 169         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 170                 return -EOPNOTSUPP;
 171
 172         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 173                 if (!wdev->netdev)
 174                         continue;
 175                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 176                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 177                 if (err)
 178                         break;
 179                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 180         }
 181
 182         if (err) {
 183                 /* failed -- clean up to old netns */
 184                 net = wiphy_net(&rdev->wiphy);
 185
 186                 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,
 187                                                      list) {
 188                         if (!wdev->netdev)
 189                                 continue;
 190                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 191                         err = dev_change_net_namespace(wdev->netdev, net,
 192                                                         "wlan%d");
 193                         WARN_ON(err);
 194                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 195                 }
 196
 197                 return err;
 198         }
 199
 200         wiphy_net_set(&rdev->wiphy, net);
 201
 202         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 203         WARN_ON(err);
 204
 205         return 0;
 206 }
 207
 208 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 209 {
 210         struct cfg80211_registered_device *rdev = data;
 211
 212         rdev_rfkill_poll(rdev);
 213 }
 214
 215 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 216 {
 217         struct cfg80211_registered_device *rdev = data;
 218         struct wireless_dev *wdev;
 219
 220         if (!blocked)
 221                 return 0;
 222
 223         rtnl_lock();
 224         mutex_lock(&rdev->devlist_mtx);
 225
 226         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 227                 if (wdev->netdev) {
 228                         dev_close(wdev->netdev);
 229                         continue;
 230                 }
 231                 /* otherwise, check iftype */
 232                 switch (wdev->iftype) {
 233                 case NL80211_IFTYPE_P2P_DEVICE:
 234                         if (!wdev->p2p_started)
 235                                 break;
 236                         rdev_stop_p2p_device(rdev, wdev);
 237                         wdev->p2p_started = false;
 238                         rdev->opencount--;
 239                         break;
 240                 default:
 241                         break;
 242                 }
 243         }
 244
 245         mutex_unlock(&rdev->devlist_mtx);
 246         rtnl_unlock();
 247
 248         return 0;
 249 }
 250
 251 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 252 {
 253         struct cfg80211_registered_device *rdev;
 254
 255         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 256         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 257 }
 258
 259 static void cfg80211_event_work(struct work_struct *work)
 260 {
 261         struct cfg80211_registered_device *rdev;
 262
 263         rdev = container_of(work, struct cfg80211_registered_device,
 264                             event_work);
 265
 266         rtnl_lock();
 267         cfg80211_lock_rdev(rdev);
 268
 269         cfg80211_process_rdev_events(rdev);
 270         cfg80211_unlock_rdev(rdev);
 271         rtnl_unlock();
 272 }
 273
 274 /* exported functions */
 275
 276 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 277 {
 278         static int wiphy_counter;
 279
 280         struct cfg80211_registered_device *rdev;
 281         int alloc_size;
 282
 283         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 284         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 285         WARN_ON(ops->connect && !ops->disconnect);
 286         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 287         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 288         WARN_ON(ops->add_station && !ops->del_station);
 289         WARN_ON(ops->add_mpath && !ops->del_mpath);
 290         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 291
 292         alloc_size = sizeof(*rdev) + sizeof_priv;
 293
 294         rdev = kzalloc(alloc_size, GFP_KERNEL);
 295         if (!rdev)
 296                 return NULL;
 297
 298         rdev->ops = ops;
 299
 300         mutex_lock(&cfg80211_mutex);
 301
 302         rdev->wiphy_idx = wiphy_counter++;
 303
 304         if (unlikely(rdev->wiphy_idx < 0)) {
 305                 wiphy_counter--;
 306                 mutex_unlock(&cfg80211_mutex);
 307                 /* ugh, wrapped! */
 308                 kfree(rdev);
 309                 return NULL;
 310         }
 311
 312         mutex_unlock(&cfg80211_mutex);
 313
 314         /* give it a proper name */
 315         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 316
 317         mutex_init(&rdev->mtx);
 318         mutex_init(&rdev->devlist_mtx);
 319         mutex_init(&rdev->sched_scan_mtx);
 320         INIT_LIST_HEAD(&rdev->wdev_list);
 321         INIT_LIST_HEAD(&rdev->beacon_registrations);
 322         spin_lock_init(&rdev->beacon_registrations_lock);
 323         spin_lock_init(&rdev->bss_lock);
 324         INIT_LIST_HEAD(&rdev->bss_list);
 325         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 326         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 327         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 328                           cfg80211_dfs_channels_update_work);
 329 #ifdef CONFIG_CFG80211_WEXT
 330         rdev->wiphy.wext = &cfg80211_wext_handler;
 331 #endif
 332
 333         device_initialize(&rdev->wiphy.dev);
 334         rdev->wiphy.dev.class = &ieee80211_class;
 335         rdev->wiphy.dev.platform_data = rdev;
 336
 337 #ifdef CONFIG_CFG80211_DEFAULT_PS
 338         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 339 #endif
 340
 341         wiphy_net_set(&rdev->wiphy, &init_net);
 342
 343         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 344         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 345                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 346                                    &rdev->rfkill_ops, rdev);
 347
 348         if (!rdev->rfkill) {
 349                 kfree(rdev);
 350                 return NULL;
 351         }
 352
 353         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 354         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 355         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 356
 357         init_waitqueue_head(&rdev->dev_wait);
 358
 359         /*
 360          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 361          * Fragmentation and RTS threshold are disabled by default with the
 362          * special -1 value.
 363          */
 364         rdev->wiphy.retry_short = 7;
 365         rdev->wiphy.retry_long = 4;
 366         rdev->wiphy.frag_threshold = (u32) -1;
 367         rdev->wiphy.rts_threshold = (u32) -1;
 368         rdev->wiphy.coverage_class = 0;
 369
 370         rdev->wiphy.features = NL80211_FEATURE_SCAN_FLUSH |
 371                                NL80211_FEATURE_ADVERTISE_CHAN_LIMITS;
 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                 /*
 389                  * Combinations with just one interface aren't real,
 390                  * however we make an exception for DFS.
 391                  */
 392                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 393                         return -EINVAL;
 394
 395                 /* Need at least one channel */
 396                 if (WARN_ON(!c->num_different_channels))
 397                         return -EINVAL;
 398
 399                 /*
 400                  * Put a sane limit on maximum number of different
 401                  * channels to simplify channel accounting code.
 402                  */
 403                 if (WARN_ON(c->num_different_channels >
 404                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 405                         return -EINVAL;
 406
 407                 /* DFS only works on one channel. */
 408                 if (WARN_ON(c->radar_detect_widths &&
 409                             (c->num_different_channels > 1)))
 410                         return -EINVAL;
 411
 412                 if (WARN_ON(!c->n_limits))
 413                         return -EINVAL;
 414
 415                 for (j = 0; j < c->n_limits; j++) {
 416                         u16 types = c->limits[j].types;
 417
 418                         /*
 419                          * interface types shouldn't overlap, this is
 420                          * used in cfg80211_can_change_interface()
 421                          */
 422                         if (WARN_ON(types & all_iftypes))
 423                                 return -EINVAL;
 424                         all_iftypes |= types;
 425
 426                         if (WARN_ON(!c->limits[j].max))
 427                                 return -EINVAL;
 428
 429                         /* Shouldn't list software iftypes in combinations! */
 430                         if (WARN_ON(wiphy->software_iftypes & types))
 431                                 return -EINVAL;
 432
 433                         /* Only a single P2P_DEVICE can be allowed */
 434                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 435                                     c->limits[j].max > 1))
 436                                 return -EINVAL;
 437
 438                         cnt += c->limits[j].max;
 439                         /*
 440                          * Don't advertise an unsupported type
 441                          * in a combination.
 442                          */
 443                         if (WARN_ON((wiphy->interface_modes & types) != types))
 444                                 return -EINVAL;
 445                 }
 446
 447                 /* You can't even choose that many! */
 448                 if (WARN_ON(cnt < c->max_interfaces))
 449                         return -EINVAL;
 450         }
 451
 452         return 0;
 453 }
 454
 455 int wiphy_register(struct wiphy *wiphy)
 456 {
 457         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 458         int res;
 459         enum ieee80211_band band;
 460         struct ieee80211_supported_band *sband;
 461         bool have_band = false;
 462         int i;
 463         u16 ifmodes = wiphy->interface_modes;
 464
 465 #ifdef CONFIG_PM
 466         if (WARN_ON((wiphy->wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 467                     !(wiphy->wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 468                 return -EINVAL;
 469 #endif
 470
 471         if (WARN_ON(wiphy->ap_sme_capa &&
 472                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 473                 return -EINVAL;
 474
 475         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 476                 return -EINVAL;
 477
 478         if (WARN_ON(wiphy->addresses &&
 479                     !is_zero_ether_addr(wiphy->perm_addr) &&
 480                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 481                            ETH_ALEN)))
 482                 return -EINVAL;
 483
 484         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 485                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 486                      !rdev->ops->set_mac_acl)))
 487                 return -EINVAL;
 488
 489         if (wiphy->addresses)
 490                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 491
 492         /* sanity check ifmodes */
 493         WARN_ON(!ifmodes);
 494         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 495         if (WARN_ON(ifmodes != wiphy->interface_modes))
 496                 wiphy->interface_modes = ifmodes;
 497
 498         res = wiphy_verify_combinations(wiphy);
 499         if (res)
 500                 return res;
 501
 502         /* sanity check supported bands/channels */
 503         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 504                 sband = wiphy->bands[band];
 505                 if (!sband)
 506                         continue;
 507
 508                 sband->band = band;
 509                 if (WARN_ON(!sband->n_channels))
 510                         return -EINVAL;
 511                 /*
 512                  * on 60gHz band, there are no legacy rates, so
 513                  * n_bitrates is 0
 514                  */
 515                 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
 516                             !sband->n_bitrates))
 517                         return -EINVAL;
 518
 519                 /*
 520                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 521                  * modify the sband's ht data even if the driver uses a
 522                  * global structure for that.
 523                  */
 524                 if (cfg80211_disable_40mhz_24ghz &&
 525                     band == IEEE80211_BAND_2GHZ &&
 526                     sband->ht_cap.ht_supported) {
 527                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 528                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 529                 }
 530
 531                 /*
 532                  * Since we use a u32 for rate bitmaps in
 533                  * ieee80211_get_response_rate, we cannot
 534                  * have more than 32 legacy rates.
 535                  */
 536                 if (WARN_ON(sband->n_bitrates > 32))
 537                         return -EINVAL;
 538
 539                 for (i = 0; i < sband->n_channels; i++) {
 540                         sband->channels[i].orig_flags =
 541                                 sband->channels[i].flags;
 542                         sband->channels[i].orig_mag = INT_MAX;
 543                         sband->channels[i].orig_mpwr =
 544                                 sband->channels[i].max_power;
 545                         sband->channels[i].band = band;
 546                 }
 547
 548                 have_band = true;
 549         }
 550
 551         if (!have_band) {
 552                 WARN_ON(1);
 553                 return -EINVAL;
 554         }
 555
 556 #ifdef CONFIG_PM
 557         if (rdev->wiphy.wowlan.n_patterns) {
 558                 if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len ||
 559                             rdev->wiphy.wowlan.pattern_min_len >
 560                             rdev->wiphy.wowlan.pattern_max_len))
 561                         return -EINVAL;
 562         }
 563 #endif
 564
 565         /* check and set up bitrates */
 566         ieee80211_set_bitrate_flags(wiphy);
 567
 568         mutex_lock(&cfg80211_mutex);
 569
 570         res = device_add(&rdev->wiphy.dev);
 571         if (res) {
 572                 mutex_unlock(&cfg80211_mutex);
 573                 return res;
 574         }
 575
 576         /* set up regulatory info */
 577         wiphy_regulatory_register(wiphy);
 578
 579         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 580         cfg80211_rdev_list_generation++;
 581
 582         /* add to debugfs */
 583         rdev->wiphy.debugfsdir =
 584                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 585                                    ieee80211_debugfs_dir);
 586         if (IS_ERR(rdev->wiphy.debugfsdir))
 587                 rdev->wiphy.debugfsdir = NULL;
 588
 589         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
 590                 struct regulatory_request request;
 591
 592                 request.wiphy_idx = get_wiphy_idx(wiphy);
 593                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 594                 request.alpha2[0] = '9';
 595                 request.alpha2[1] = '9';
 596
 597                 nl80211_send_reg_change_event(&request);
 598         }
 599
 600         cfg80211_debugfs_rdev_add(rdev);
 601         mutex_unlock(&cfg80211_mutex);
 602
 603         /*
 604          * due to a locking dependency this has to be outside of the
 605          * cfg80211_mutex lock
 606          */
 607         res = rfkill_register(rdev->rfkill);
 608         if (res)
 609                 goto out_rm_dev;
 610
 611         rtnl_lock();
 612         rdev->wiphy.registered = true;
 613         rtnl_unlock();
 614         return 0;
 615
 616 out_rm_dev:
 617         device_del(&rdev->wiphy.dev);
 618         return res;
 619 }
 620 EXPORT_SYMBOL(wiphy_register);
 621
 622 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 623 {
 624         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 625
 626         if (!rdev->ops->rfkill_poll)
 627                 return;
 628         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 629         rfkill_resume_polling(rdev->rfkill);
 630 }
 631 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 632
 633 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 634 {
 635         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 636
 637         rfkill_pause_polling(rdev->rfkill);
 638 }
 639 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 640
 641 void wiphy_unregister(struct wiphy *wiphy)
 642 {
 643         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 644
 645         rtnl_lock();
 646         rdev->wiphy.registered = false;
 647         rtnl_unlock();
 648
 649         rfkill_unregister(rdev->rfkill);
 650
 651         /* protect the device list */
 652         mutex_lock(&cfg80211_mutex);
 653
 654         wait_event(rdev->dev_wait, ({
 655                 int __count;
 656                 mutex_lock(&rdev->devlist_mtx);
 657                 __count = rdev->opencount;
 658                 mutex_unlock(&rdev->devlist_mtx);
 659                 __count == 0; }));
 660
 661         mutex_lock(&rdev->devlist_mtx);
 662         BUG_ON(!list_empty(&rdev->wdev_list));
 663         mutex_unlock(&rdev->devlist_mtx);
 664
 665         /*
 666          * First remove the hardware from everywhere, this makes
 667          * it impossible to find from userspace.
 668          */
 669         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 670         list_del_rcu(&rdev->list);
 671         synchronize_rcu();
 672
 673         /*
 674          * Try to grab rdev->mtx. If a command is still in progress,
 675          * hopefully the driver will refuse it since it's tearing
 676          * down the device already. We wait for this command to complete
 677          * before unlinking the item from the list.
 678          * Note: as codified by the BUG_ON above we cannot get here if
 679          * a virtual interface is still present. Hence, we can only get
 680          * to lock contention here if userspace issues a command that
 681          * identified the hardware by wiphy index.
 682          */
 683         cfg80211_lock_rdev(rdev);
 684         /* nothing */
 685         cfg80211_unlock_rdev(rdev);
 686
 687         /*
 688          * If this device got a regulatory hint tell core its
 689          * free to listen now to a new shiny device regulatory hint
 690          */
 691         wiphy_regulatory_deregister(wiphy);
 692
 693         cfg80211_rdev_list_generation++;
 694         device_del(&rdev->wiphy.dev);
 695
 696         mutex_unlock(&cfg80211_mutex);
 697
 698         flush_work(&rdev->scan_done_wk);
 699         cancel_work_sync(&rdev->conn_work);
 700         flush_work(&rdev->event_work);
 701         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 702
 703         if (rdev->wowlan && rdev->ops->set_wakeup)
 704                 rdev_set_wakeup(rdev, false);
 705         cfg80211_rdev_free_wowlan(rdev);
 706 }
 707 EXPORT_SYMBOL(wiphy_unregister);
 708
 709 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 710 {
 711         struct cfg80211_internal_bss *scan, *tmp;
 712         struct cfg80211_beacon_registration *reg, *treg;
 713         rfkill_destroy(rdev->rfkill);
 714         mutex_destroy(&rdev->mtx);
 715         mutex_destroy(&rdev->devlist_mtx);
 716         mutex_destroy(&rdev->sched_scan_mtx);
 717         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 718                 list_del(&reg->list);
 719                 kfree(reg);
 720         }
 721         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 722                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 723         kfree(rdev);
 724 }
 725
 726 void wiphy_free(struct wiphy *wiphy)
 727 {
 728         put_device(&wiphy->dev);
 729 }
 730 EXPORT_SYMBOL(wiphy_free);
 731
 732 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 733 {
 734         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 735
 736         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 737                 schedule_work(&rdev->rfkill_sync);
 738 }
 739 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 740
 741 static void wdev_cleanup_work(struct work_struct *work)
 742 {
 743         struct wireless_dev *wdev;
 744         struct cfg80211_registered_device *rdev;
 745
 746         wdev = container_of(work, struct wireless_dev, cleanup_work);
 747         rdev = wiphy_to_dev(wdev->wiphy);
 748
 749         cfg80211_lock_rdev(rdev);
 750
 751         if (WARN_ON(rdev->scan_req && rdev->scan_req->wdev == wdev)) {
 752                 rdev->scan_req->aborted = true;
 753                 ___cfg80211_scan_done(rdev, true);
 754         }
 755
 756         cfg80211_unlock_rdev(rdev);
 757
 758         mutex_lock(&rdev->sched_scan_mtx);
 759
 760         if (WARN_ON(rdev->sched_scan_req &&
 761                     rdev->sched_scan_req->dev == wdev->netdev)) {
 762                 __cfg80211_stop_sched_scan(rdev, false);
 763         }
 764
 765         mutex_unlock(&rdev->sched_scan_mtx);
 766
 767         mutex_lock(&rdev->devlist_mtx);
 768         rdev->opencount--;
 769         mutex_unlock(&rdev->devlist_mtx);
 770         wake_up(&rdev->dev_wait);
 771
 772         dev_put(wdev->netdev);
 773 }
 774
 775 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 776 {
 777         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 778
 779         ASSERT_RTNL();
 780
 781         if (WARN_ON(wdev->netdev))
 782                 return;
 783
 784         mutex_lock(&rdev->devlist_mtx);
 785         list_del_rcu(&wdev->list);
 786         rdev->devlist_generation++;
 787
 788         switch (wdev->iftype) {
 789         case NL80211_IFTYPE_P2P_DEVICE:
 790                 if (!wdev->p2p_started)
 791                         break;
 792                 rdev_stop_p2p_device(rdev, wdev);
 793                 wdev->p2p_started = false;
 794                 rdev->opencount--;
 795                 break;
 796         default:
 797                 WARN_ON_ONCE(1);
 798                 break;
 799         }
 800         mutex_unlock(&rdev->devlist_mtx);
 801 }
 802 EXPORT_SYMBOL(cfg80211_unregister_wdev);
 803
 804 static struct device_type wiphy_type = {
 805         .name   = "wlan",
 806 };
 807
 808 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 809                                enum nl80211_iftype iftype, int num)
 810 {
 811         ASSERT_RTNL();
 812
 813         rdev->num_running_ifaces += num;
 814         if (iftype == NL80211_IFTYPE_MONITOR)
 815                 rdev->num_running_monitor_ifaces += num;
 816 }
 817
 818 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 819                                          unsigned long state,
 820                                          void *ndev)
 821 {
 822         struct net_device *dev = ndev;
 823         struct wireless_dev *wdev = dev->ieee80211_ptr;
 824         struct cfg80211_registered_device *rdev;
 825         int ret;
 826
 827         if (!wdev)
 828                 return NOTIFY_DONE;
 829
 830         rdev = wiphy_to_dev(wdev->wiphy);
 831
 832         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 833
 834         switch (state) {
 835         case NETDEV_POST_INIT:
 836                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 837                 break;
 838         case NETDEV_REGISTER:
 839                 /*
 840                  * NB: cannot take rdev->mtx here because this may be
 841                  * called within code protected by it when interfaces
 842                  * are added with nl80211.
 843                  */
 844                 mutex_init(&wdev->mtx);
 845                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
 846                 INIT_LIST_HEAD(&wdev->event_list);
 847                 spin_lock_init(&wdev->event_lock);
 848                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
 849                 spin_lock_init(&wdev->mgmt_registrations_lock);
 850
 851                 mutex_lock(&rdev->devlist_mtx);
 852                 wdev->identifier = ++rdev->wdev_id;
 853                 list_add_rcu(&wdev->list, &rdev->wdev_list);
 854                 rdev->devlist_generation++;
 855                 /* can only change netns with wiphy */
 856                 dev->features |= NETIF_F_NETNS_LOCAL;
 857
 858                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 859                                       "phy80211")) {
 860                         pr_err("failed to add phy80211 symlink to netdev!\n");
 861                 }
 862                 wdev->netdev = dev;
 863                 wdev->sme_state = CFG80211_SME_IDLE;
 864                 mutex_unlock(&rdev->devlist_mtx);
 865 #ifdef CONFIG_CFG80211_WEXT
 866                 wdev->wext.default_key = -1;
 867                 wdev->wext.default_mgmt_key = -1;
 868                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 869 #endif
 870
 871                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
 872                         wdev->ps = true;
 873                 else
 874                         wdev->ps = false;
 875                 /* allow mac80211 to determine the timeout */
 876                 wdev->ps_timeout = -1;
 877
 878                 netdev_set_default_ethtool_ops(dev, &cfg80211_ethtool_ops);
 879
 880                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 881                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
 882                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
 883                         dev->priv_flags |= IFF_DONT_BRIDGE;
 884                 break;
 885         case NETDEV_GOING_DOWN:
 886                 switch (wdev->iftype) {
 887                 case NL80211_IFTYPE_ADHOC:
 888                         cfg80211_leave_ibss(rdev, dev, true);
 889                         break;
 890                 case NL80211_IFTYPE_P2P_CLIENT:
 891                 case NL80211_IFTYPE_STATION:
 892                         mutex_lock(&rdev->sched_scan_mtx);
 893                         __cfg80211_stop_sched_scan(rdev, false);
 894                         mutex_unlock(&rdev->sched_scan_mtx);
 895
 896                         wdev_lock(wdev);
 897 #ifdef CONFIG_CFG80211_WEXT
 898                         kfree(wdev->wext.ie);
 899                         wdev->wext.ie = NULL;
 900                         wdev->wext.ie_len = 0;
 901                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 902 #endif
 903                         __cfg80211_disconnect(rdev, dev,
 904                                               WLAN_REASON_DEAUTH_LEAVING, true);
 905                         cfg80211_mlme_down(rdev, dev);
 906                         wdev_unlock(wdev);
 907                         break;
 908                 case NL80211_IFTYPE_MESH_POINT:
 909                         cfg80211_leave_mesh(rdev, dev);
 910                         break;
 911                 case NL80211_IFTYPE_AP:
 912                         cfg80211_stop_ap(rdev, dev);
 913                         break;
 914                 default:
 915                         break;
 916                 }
 917                 wdev->beacon_interval = 0;
 918                 break;
 919         case NETDEV_DOWN:
 920                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
 921                 dev_hold(dev);
 922                 queue_work(cfg80211_wq, &wdev->cleanup_work);
 923                 break;
 924         case NETDEV_UP:
 925                 /*
 926                  * If we have a really quick DOWN/UP succession we may
 927                  * have this work still pending ... cancel it and see
 928                  * if it was pending, in which case we need to account
 929                  * for some of the work it would have done.
 930                  */
 931                 if (cancel_work_sync(&wdev->cleanup_work)) {
 932                         mutex_lock(&rdev->devlist_mtx);
 933                         rdev->opencount--;
 934                         mutex_unlock(&rdev->devlist_mtx);
 935                         dev_put(dev);
 936                 }
 937                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
 938                 cfg80211_lock_rdev(rdev);
 939                 mutex_lock(&rdev->devlist_mtx);
 940                 wdev_lock(wdev);
 941                 switch (wdev->iftype) {
 942 #ifdef CONFIG_CFG80211_WEXT
 943                 case NL80211_IFTYPE_ADHOC:
 944                         cfg80211_ibss_wext_join(rdev, wdev);
 945                         break;
 946                 case NL80211_IFTYPE_STATION:
 947                         cfg80211_mgd_wext_connect(rdev, wdev);
 948                         break;
 949 #endif
 950 #ifdef CONFIG_MAC80211_MESH
 951                 case NL80211_IFTYPE_MESH_POINT:
 952                         {
 953                                 /* backward compat code... */
 954                                 struct mesh_setup setup;
 955                                 memcpy(&setup, &default_mesh_setup,
 956                                                 sizeof(setup));
 957                                  /* back compat only needed for mesh_id */
 958                                 setup.mesh_id = wdev->ssid;
 959                                 setup.mesh_id_len = wdev->mesh_id_up_len;
 960                                 if (wdev->mesh_id_up_len)
 961                                         __cfg80211_join_mesh(rdev, dev,
 962                                                         &setup,
 963                                                         &default_mesh_config);
 964                                 break;
 965                         }
 966 #endif
 967                 default:
 968                         break;
 969                 }
 970                 wdev_unlock(wdev);
 971                 rdev->opencount++;
 972                 mutex_unlock(&rdev->devlist_mtx);
 973                 cfg80211_unlock_rdev(rdev);
 974
 975                 /*
 976                  * Configure power management to the driver here so that its
 977                  * correctly set also after interface type changes etc.
 978                  */
 979                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 980                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
 981                     rdev->ops->set_power_mgmt)
 982                         if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
 983                                                 wdev->ps_timeout)) {
 984                                 /* assume this means it's off */
 985                                 wdev->ps = false;
 986                         }
 987                 break;
 988         case NETDEV_UNREGISTER:
 989                 /*
 990                  * NB: cannot take rdev->mtx here because this may be
 991                  * called within code protected by it when interfaces
 992                  * are removed with nl80211.
 993                  */
 994                 mutex_lock(&rdev->devlist_mtx);
 995                 /*
 996                  * It is possible to get NETDEV_UNREGISTER
 997                  * multiple times. To detect that, check
 998                  * that the interface is still on the list
 999                  * of registered interfaces, and only then
1000                  * remove and clean it up.
1001                  */
1002                 if (!list_empty(&wdev->list)) {
1003                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1004                         list_del_rcu(&wdev->list);
1005                         rdev->devlist_generation++;
1006                         cfg80211_mlme_purge_registrations(wdev);
1007 #ifdef CONFIG_CFG80211_WEXT
1008                         kfree(wdev->wext.keys);
1009 #endif
1010                 }
1011                 mutex_unlock(&rdev->devlist_mtx);
1012                 /*
1013                  * synchronise (so that we won't find this netdev
1014                  * from other code any more) and then clear the list
1015                  * head so that the above code can safely check for
1016                  * !list_empty() to avoid double-cleanup.
1017                  */
1018                 synchronize_rcu();
1019                 INIT_LIST_HEAD(&wdev->list);
1020                 /*
1021                  * Ensure that all events have been processed and
1022                  * freed.
1023                  */
1024                 cfg80211_process_wdev_events(wdev);
1025                 break;
1026         case NETDEV_PRE_UP:
1027                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1028                         return notifier_from_errno(-EOPNOTSUPP);
1029                 if (rfkill_blocked(rdev->rfkill))
1030                         return notifier_from_errno(-ERFKILL);
1031                 mutex_lock(&rdev->devlist_mtx);
1032                 ret = cfg80211_can_add_interface(rdev, wdev->iftype);
1033                 mutex_unlock(&rdev->devlist_mtx);
1034                 if (ret)
1035                         return notifier_from_errno(ret);
1036                 break;
1037         }
1038
1039         return NOTIFY_DONE;
1040 }
1041
1042 static struct notifier_block cfg80211_netdev_notifier = {
1043         .notifier_call = cfg80211_netdev_notifier_call,
1044 };
1045
1046 static void __net_exit cfg80211_pernet_exit(struct net *net)
1047 {
1048         struct cfg80211_registered_device *rdev;
1049
1050         rtnl_lock();
1051         mutex_lock(&cfg80211_mutex);
1052         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1053                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1054                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1055         }
1056         mutex_unlock(&cfg80211_mutex);
1057         rtnl_unlock();
1058 }
1059
1060 static struct pernet_operations cfg80211_pernet_ops = {
1061         .exit = cfg80211_pernet_exit,
1062 };
1063
1064 static int __init cfg80211_init(void)
1065 {
1066         int err;
1067
1068         err = register_pernet_device(&cfg80211_pernet_ops);
1069         if (err)
1070                 goto out_fail_pernet;
1071
1072         err = wiphy_sysfs_init();
1073         if (err)
1074                 goto out_fail_sysfs;
1075
1076         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1077         if (err)
1078                 goto out_fail_notifier;
1079
1080         err = nl80211_init();
1081         if (err)
1082                 goto out_fail_nl80211;
1083
1084         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1085
1086         err = regulatory_init();
1087         if (err)
1088                 goto out_fail_reg;
1089
1090         cfg80211_wq = create_singlethread_workqueue("cfg80211");
1091         if (!cfg80211_wq)
1092                 goto out_fail_wq;
1093
1094         return 0;
1095
1096 out_fail_wq:
1097         regulatory_exit();
1098 out_fail_reg:
1099         debugfs_remove(ieee80211_debugfs_dir);
1100 out_fail_nl80211:
1101         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1102 out_fail_notifier:
1103         wiphy_sysfs_exit();
1104 out_fail_sysfs:
1105         unregister_pernet_device(&cfg80211_pernet_ops);
1106 out_fail_pernet:
1107         return err;
1108 }
1109 subsys_initcall(cfg80211_init);
1110
1111 static void __exit cfg80211_exit(void)
1112 {
1113         debugfs_remove(ieee80211_debugfs_dir);
1114         nl80211_exit();
1115         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1116         wiphy_sysfs_exit();
1117         regulatory_exit();
1118         unregister_pernet_device(&cfg80211_pernet_ops);
1119         destroy_workqueue(cfg80211_wq);
1120 }
1121 module_exit(cfg80211_exit);