net/wireless/core.c

   1 /*
   2  * This is the linux wireless configuration interface.
   3  *
   4  * Copyright 2006-2010          Johannes Berg <johannes@sipsolutions.net>
   5  */
   6
   7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   8
   9 #include <linux/if.h>
  10 #include <linux/module.h>
  11 #include <linux/err.h>
  12 #include <linux/list.h>
  13 #include <linux/slab.h>
  14 #include <linux/nl80211.h>
  15 #include <linux/debugfs.h>
  16 #include <linux/notifier.h>
  17 #include <linux/device.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/sched.h>
  21 #include <net/genetlink.h>
  22 #include <net/cfg80211.h>
  23 #include "nl80211.h"
  24 #include "core.h"
  25 #include "sysfs.h"
  26 #include "debugfs.h"
  27 #include "wext-compat.h"
  28 #include "ethtool.h"
  29 #include "rdev-ops.h"
  30
  31 /* name for sysfs, %d is appended */
  32 #define PHY_NAME "phy"
  33
  34 MODULE_AUTHOR("Johannes Berg");
  35 MODULE_LICENSE("GPL");
  36 MODULE_DESCRIPTION("wireless configuration support");
  37 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
  38
  39 /* RCU-protected (and RTNL for writers) */
  40 LIST_HEAD(cfg80211_rdev_list);
  41 int cfg80211_rdev_list_generation;
  42
  43 /* for debugfs */
  44 static struct dentry *ieee80211_debugfs_dir;
  45
  46 /* for the cleanup, scan and event works */
  47 struct workqueue_struct *cfg80211_wq;
  48
  49 static bool cfg80211_disable_40mhz_24ghz;
  50 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  51 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  52                  "Disable 40MHz support in the 2.4GHz band");
  53
  54 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  55 {
  56         struct cfg80211_registered_device *result = NULL, *rdev;
  57
  58         ASSERT_RTNL();
  59
  60         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  61                 if (rdev->wiphy_idx == wiphy_idx) {
  62                         result = rdev;
  63                         break;
  64                 }
  65         }
  66
  67         return result;
  68 }
  69
  70 int get_wiphy_idx(struct wiphy *wiphy)
  71 {
  72         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
  73
  74         return rdev->wiphy_idx;
  75 }
  76
  77 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  78 {
  79         struct cfg80211_registered_device *rdev;
  80
  81         ASSERT_RTNL();
  82
  83         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  84         if (!rdev)
  85                 return NULL;
  86         return &rdev->wiphy;
  87 }
  88
  89 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
  90                         char *newname)
  91 {
  92         struct cfg80211_registered_device *rdev2;
  93         int wiphy_idx, taken = -1, result, digits;
  94
  95         ASSERT_RTNL();
  96
  97         /* prohibit calling the thing phy%d when %d is not its number */
  98         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
  99         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 100                 /* count number of places needed to print wiphy_idx */
 101                 digits = 1;
 102                 while (wiphy_idx /= 10)
 103                         digits++;
 104                 /*
 105                  * deny the name if it is phy<idx> where <idx> is printed
 106                  * without leading zeroes. taken == strlen(newname) here
 107                  */
 108                 if (taken == strlen(PHY_NAME) + digits)
 109                         return -EINVAL;
 110         }
 111
 112
 113         /* Ignore nop renames */
 114         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
 115                 return 0;
 116
 117         /* Ensure another device does not already have this name. */
 118         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 119                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
 120                         return -EINVAL;
 121
 122         result = device_rename(&rdev->wiphy.dev, newname);
 123         if (result)
 124                 return result;
 125
 126         if (rdev->wiphy.debugfsdir &&
 127             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 128                             rdev->wiphy.debugfsdir,
 129                             rdev->wiphy.debugfsdir->d_parent,
 130                             newname))
 131                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 132
 133         nl80211_notify_dev_rename(rdev);
 134
 135         return 0;
 136 }
 137
 138 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 139                           struct net *net)
 140 {
 141         struct wireless_dev *wdev;
 142         int err = 0;
 143
 144         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 145                 return -EOPNOTSUPP;
 146
 147         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 148                 if (!wdev->netdev)
 149                         continue;
 150                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 151                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 152                 if (err)
 153                         break;
 154                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 155         }
 156
 157         if (err) {
 158                 /* failed -- clean up to old netns */
 159                 net = wiphy_net(&rdev->wiphy);
 160
 161                 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,
 162                                                      list) {
 163                         if (!wdev->netdev)
 164                                 continue;
 165                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 166                         err = dev_change_net_namespace(wdev->netdev, net,
 167                                                         "wlan%d");
 168                         WARN_ON(err);
 169                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 170                 }
 171
 172                 return err;
 173         }
 174
 175         wiphy_net_set(&rdev->wiphy, net);
 176
 177         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 178         WARN_ON(err);
 179
 180         return 0;
 181 }
 182
 183 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 184 {
 185         struct cfg80211_registered_device *rdev = data;
 186
 187         rdev_rfkill_poll(rdev);
 188 }
 189
 190 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 191                               struct wireless_dev *wdev)
 192 {
 193         ASSERT_RTNL();
 194
 195         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 196                 return;
 197
 198         if (!wdev->p2p_started)
 199                 return;
 200
 201         rdev_stop_p2p_device(rdev, wdev);
 202         wdev->p2p_started = false;
 203
 204         rdev->opencount--;
 205
 206         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 207                 /*
 208                  * If the scan request wasn't notified as done, set it
 209                  * to aborted and leak it after a warning. The driver
 210                  * should have notified us that it ended at the latest
 211                  * during rdev_stop_p2p_device().
 212                  */
 213                 if (WARN_ON(!rdev->scan_req->notified))
 214                         rdev->scan_req->aborted = true;
 215                 ___cfg80211_scan_done(rdev, !rdev->scan_req->notified);
 216         }
 217 }
 218
 219 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 220 {
 221         struct cfg80211_registered_device *rdev = data;
 222         struct wireless_dev *wdev;
 223
 224         if (!blocked)
 225                 return 0;
 226
 227         rtnl_lock();
 228
 229         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 230                 if (wdev->netdev) {
 231                         dev_close(wdev->netdev);
 232                         continue;
 233                 }
 234                 /* otherwise, check iftype */
 235                 switch (wdev->iftype) {
 236                 case NL80211_IFTYPE_P2P_DEVICE:
 237                         cfg80211_stop_p2p_device(rdev, wdev);
 238                         break;
 239                 default:
 240                         break;
 241                 }
 242         }
 243
 244         rtnl_unlock();
 245
 246         return 0;
 247 }
 248
 249 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 250 {
 251         struct cfg80211_registered_device *rdev;
 252
 253         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 254         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 255 }
 256
 257 static void cfg80211_event_work(struct work_struct *work)
 258 {
 259         struct cfg80211_registered_device *rdev;
 260
 261         rdev = container_of(work, struct cfg80211_registered_device,
 262                             event_work);
 263
 264         rtnl_lock();
 265         cfg80211_process_rdev_events(rdev);
 266         rtnl_unlock();
 267 }
 268
 269 /* exported functions */
 270
 271 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 272 {
 273         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 274
 275         struct cfg80211_registered_device *rdev;
 276         int alloc_size;
 277
 278         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 279         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 280         WARN_ON(ops->connect && !ops->disconnect);
 281         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 282         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 283         WARN_ON(ops->add_station && !ops->del_station);
 284         WARN_ON(ops->add_mpath && !ops->del_mpath);
 285         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 286
 287         alloc_size = sizeof(*rdev) + sizeof_priv;
 288
 289         rdev = kzalloc(alloc_size, GFP_KERNEL);
 290         if (!rdev)
 291                 return NULL;
 292
 293         rdev->ops = ops;
 294
 295         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 296
 297         if (unlikely(rdev->wiphy_idx < 0)) {
 298                 /* ugh, wrapped! */
 299                 atomic_dec(&wiphy_counter);
 300                 kfree(rdev);
 301                 return NULL;
 302         }
 303
 304         /* give it a proper name */
 305         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 306
 307         INIT_LIST_HEAD(&rdev->wdev_list);
 308         INIT_LIST_HEAD(&rdev->beacon_registrations);
 309         spin_lock_init(&rdev->beacon_registrations_lock);
 310         spin_lock_init(&rdev->bss_lock);
 311         INIT_LIST_HEAD(&rdev->bss_list);
 312         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 313         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 314         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 315                           cfg80211_dfs_channels_update_work);
 316 #ifdef CONFIG_CFG80211_WEXT
 317         rdev->wiphy.wext = &cfg80211_wext_handler;
 318 #endif
 319
 320         device_initialize(&rdev->wiphy.dev);
 321         rdev->wiphy.dev.class = &ieee80211_class;
 322         rdev->wiphy.dev.platform_data = rdev;
 323
 324 #ifdef CONFIG_CFG80211_DEFAULT_PS
 325         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 326 #endif
 327
 328         wiphy_net_set(&rdev->wiphy, &init_net);
 329
 330         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 331         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 332                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 333                                    &rdev->rfkill_ops, rdev);
 334
 335         if (!rdev->rfkill) {
 336                 kfree(rdev);
 337                 return NULL;
 338         }
 339
 340         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 341         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 342         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 343
 344         init_waitqueue_head(&rdev->dev_wait);
 345
 346         /*
 347          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 348          * Fragmentation and RTS threshold are disabled by default with the
 349          * special -1 value.
 350          */
 351         rdev->wiphy.retry_short = 7;
 352         rdev->wiphy.retry_long = 4;
 353         rdev->wiphy.frag_threshold = (u32) -1;
 354         rdev->wiphy.rts_threshold = (u32) -1;
 355         rdev->wiphy.coverage_class = 0;
 356
 357         rdev->wiphy.features = NL80211_FEATURE_SCAN_FLUSH;
 358
 359         return &rdev->wiphy;
 360 }
 361 EXPORT_SYMBOL(wiphy_new);
 362
 363 static int wiphy_verify_combinations(struct wiphy *wiphy)
 364 {
 365         const struct ieee80211_iface_combination *c;
 366         int i, j;
 367
 368         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 369                 u32 cnt = 0;
 370                 u16 all_iftypes = 0;
 371
 372                 c = &wiphy->iface_combinations[i];
 373
 374                 /*
 375                  * Combinations with just one interface aren't real,
 376                  * however we make an exception for DFS.
 377                  */
 378                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 379                         return -EINVAL;
 380
 381                 /* Need at least one channel */
 382                 if (WARN_ON(!c->num_different_channels))
 383                         return -EINVAL;
 384
 385                 /*
 386                  * Put a sane limit on maximum number of different
 387                  * channels to simplify channel accounting code.
 388                  */
 389                 if (WARN_ON(c->num_different_channels >
 390                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 391                         return -EINVAL;
 392
 393                 /* DFS only works on one channel. */
 394                 if (WARN_ON(c->radar_detect_widths &&
 395                             (c->num_different_channels > 1)))
 396                         return -EINVAL;
 397
 398                 if (WARN_ON(!c->n_limits))
 399                         return -EINVAL;
 400
 401                 for (j = 0; j < c->n_limits; j++) {
 402                         u16 types = c->limits[j].types;
 403
 404                         /*
 405                          * interface types shouldn't overlap, this is
 406                          * used in cfg80211_can_change_interface()
 407                          */
 408                         if (WARN_ON(types & all_iftypes))
 409                                 return -EINVAL;
 410                         all_iftypes |= types;
 411
 412                         if (WARN_ON(!c->limits[j].max))
 413                                 return -EINVAL;
 414
 415                         /* Shouldn't list software iftypes in combinations! */
 416                         if (WARN_ON(wiphy->software_iftypes & types))
 417                                 return -EINVAL;
 418
 419                         /* Only a single P2P_DEVICE can be allowed */
 420                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 421                                     c->limits[j].max > 1))
 422                                 return -EINVAL;
 423
 424                         cnt += c->limits[j].max;
 425                         /*
 426                          * Don't advertise an unsupported type
 427                          * in a combination.
 428                          */
 429                         if (WARN_ON((wiphy->interface_modes & types) != types))
 430                                 return -EINVAL;
 431                 }
 432
 433                 /* You can't even choose that many! */
 434                 if (WARN_ON(cnt < c->max_interfaces))
 435                         return -EINVAL;
 436         }
 437
 438         return 0;
 439 }
 440
 441 int wiphy_register(struct wiphy *wiphy)
 442 {
 443         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 444         int res;
 445         enum ieee80211_band band;
 446         struct ieee80211_supported_band *sband;
 447         bool have_band = false;
 448         int i;
 449         u16 ifmodes = wiphy->interface_modes;
 450
 451 #ifdef CONFIG_PM
 452         if (WARN_ON((wiphy->wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 453                     !(wiphy->wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 454                 return -EINVAL;
 455 #endif
 456
 457         if (WARN_ON(wiphy->ap_sme_capa &&
 458                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 459                 return -EINVAL;
 460
 461         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 462                 return -EINVAL;
 463
 464         if (WARN_ON(wiphy->addresses &&
 465                     !is_zero_ether_addr(wiphy->perm_addr) &&
 466                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 467                            ETH_ALEN)))
 468                 return -EINVAL;
 469
 470         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 471                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 472                      !rdev->ops->set_mac_acl)))
 473                 return -EINVAL;
 474
 475         if (wiphy->addresses)
 476                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 477
 478         /* sanity check ifmodes */
 479         WARN_ON(!ifmodes);
 480         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 481         if (WARN_ON(ifmodes != wiphy->interface_modes))
 482                 wiphy->interface_modes = ifmodes;
 483
 484         res = wiphy_verify_combinations(wiphy);
 485         if (res)
 486                 return res;
 487
 488         /* sanity check supported bands/channels */
 489         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 490                 sband = wiphy->bands[band];
 491                 if (!sband)
 492                         continue;
 493
 494                 sband->band = band;
 495                 if (WARN_ON(!sband->n_channels))
 496                         return -EINVAL;
 497                 /*
 498                  * on 60gHz band, there are no legacy rates, so
 499                  * n_bitrates is 0
 500                  */
 501                 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
 502                             !sband->n_bitrates))
 503                         return -EINVAL;
 504
 505                 /*
 506                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 507                  * modify the sband's ht data even if the driver uses a
 508                  * global structure for that.
 509                  */
 510                 if (cfg80211_disable_40mhz_24ghz &&
 511                     band == IEEE80211_BAND_2GHZ &&
 512                     sband->ht_cap.ht_supported) {
 513                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 514                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 515                 }
 516
 517                 /*
 518                  * Since we use a u32 for rate bitmaps in
 519                  * ieee80211_get_response_rate, we cannot
 520                  * have more than 32 legacy rates.
 521                  */
 522                 if (WARN_ON(sband->n_bitrates > 32))
 523                         return -EINVAL;
 524
 525                 for (i = 0; i < sband->n_channels; i++) {
 526                         sband->channels[i].orig_flags =
 527                                 sband->channels[i].flags;
 528                         sband->channels[i].orig_mag = INT_MAX;
 529                         sband->channels[i].orig_mpwr =
 530                                 sband->channels[i].max_power;
 531                         sband->channels[i].band = band;
 532                 }
 533
 534                 have_band = true;
 535         }
 536
 537         if (!have_band) {
 538                 WARN_ON(1);
 539                 return -EINVAL;
 540         }
 541
 542 #ifdef CONFIG_PM
 543         if (rdev->wiphy.wowlan.n_patterns) {
 544                 if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len ||
 545                             rdev->wiphy.wowlan.pattern_min_len >
 546                             rdev->wiphy.wowlan.pattern_max_len))
 547                         return -EINVAL;
 548         }
 549 #endif
 550
 551         /* check and set up bitrates */
 552         ieee80211_set_bitrate_flags(wiphy);
 553
 554         rtnl_lock();
 555
 556         res = device_add(&rdev->wiphy.dev);
 557         if (res) {
 558                 rtnl_unlock();
 559                 return res;
 560         }
 561
 562         /* set up regulatory info */
 563         wiphy_regulatory_register(wiphy);
 564
 565         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 566         cfg80211_rdev_list_generation++;
 567
 568         /* add to debugfs */
 569         rdev->wiphy.debugfsdir =
 570                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 571                                    ieee80211_debugfs_dir);
 572         if (IS_ERR(rdev->wiphy.debugfsdir))
 573                 rdev->wiphy.debugfsdir = NULL;
 574
 575         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
 576                 struct regulatory_request request;
 577
 578                 request.wiphy_idx = get_wiphy_idx(wiphy);
 579                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 580                 request.alpha2[0] = '9';
 581                 request.alpha2[1] = '9';
 582
 583                 nl80211_send_reg_change_event(&request);
 584         }
 585
 586         cfg80211_debugfs_rdev_add(rdev);
 587
 588         res = rfkill_register(rdev->rfkill);
 589         if (res) {
 590                 device_del(&rdev->wiphy.dev);
 591
 592                 debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 593                 list_del_rcu(&rdev->list);
 594                 wiphy_regulatory_deregister(wiphy);
 595                 rtnl_unlock();
 596                 return res;
 597         }
 598
 599         rdev->wiphy.registered = true;
 600         rtnl_unlock();
 601         return 0;
 602 }
 603 EXPORT_SYMBOL(wiphy_register);
 604
 605 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 606 {
 607         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 608
 609         if (!rdev->ops->rfkill_poll)
 610                 return;
 611         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 612         rfkill_resume_polling(rdev->rfkill);
 613 }
 614 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 615
 616 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 617 {
 618         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 619
 620         rfkill_pause_polling(rdev->rfkill);
 621 }
 622 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 623
 624 void wiphy_unregister(struct wiphy *wiphy)
 625 {
 626         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 627
 628         wait_event(rdev->dev_wait, ({
 629                 int __count;
 630                 rtnl_lock();
 631                 __count = rdev->opencount;
 632                 rtnl_unlock();
 633                 __count == 0; }));
 634
 635         rtnl_lock();
 636         rdev->wiphy.registered = false;
 637
 638         rfkill_unregister(rdev->rfkill);
 639
 640         BUG_ON(!list_empty(&rdev->wdev_list));
 641
 642         /*
 643          * First remove the hardware from everywhere, this makes
 644          * it impossible to find from userspace.
 645          */
 646         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 647         list_del_rcu(&rdev->list);
 648         synchronize_rcu();
 649
 650         /*
 651          * If this device got a regulatory hint tell core its
 652          * free to listen now to a new shiny device regulatory hint
 653          */
 654         wiphy_regulatory_deregister(wiphy);
 655
 656         cfg80211_rdev_list_generation++;
 657         device_del(&rdev->wiphy.dev);
 658
 659         rtnl_unlock();
 660
 661         flush_work(&rdev->scan_done_wk);
 662         cancel_work_sync(&rdev->conn_work);
 663         flush_work(&rdev->event_work);
 664         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 665
 666 #ifdef CONFIG_PM
 667         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
 668                 rdev_set_wakeup(rdev, false);
 669 #endif
 670         cfg80211_rdev_free_wowlan(rdev);
 671 }
 672 EXPORT_SYMBOL(wiphy_unregister);
 673
 674 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 675 {
 676         struct cfg80211_internal_bss *scan, *tmp;
 677         struct cfg80211_beacon_registration *reg, *treg;
 678         rfkill_destroy(rdev->rfkill);
 679         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 680                 list_del(&reg->list);
 681                 kfree(reg);
 682         }
 683         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 684                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 685         kfree(rdev);
 686 }
 687
 688 void wiphy_free(struct wiphy *wiphy)
 689 {
 690         put_device(&wiphy->dev);
 691 }
 692 EXPORT_SYMBOL(wiphy_free);
 693
 694 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 695 {
 696         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 697
 698         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 699                 schedule_work(&rdev->rfkill_sync);
 700 }
 701 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 702
 703 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 704 {
 705         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 706
 707         ASSERT_RTNL();
 708
 709         if (WARN_ON(wdev->netdev))
 710                 return;
 711
 712         list_del_rcu(&wdev->list);
 713         rdev->devlist_generation++;
 714
 715         switch (wdev->iftype) {
 716         case NL80211_IFTYPE_P2P_DEVICE:
 717                 cfg80211_stop_p2p_device(rdev, wdev);
 718                 break;
 719         default:
 720                 WARN_ON_ONCE(1);
 721                 break;
 722         }
 723 }
 724 EXPORT_SYMBOL(cfg80211_unregister_wdev);
 725
 726 static struct device_type wiphy_type = {
 727         .name   = "wlan",
 728 };
 729
 730 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 731                                enum nl80211_iftype iftype, int num)
 732 {
 733         ASSERT_RTNL();
 734
 735         rdev->num_running_ifaces += num;
 736         if (iftype == NL80211_IFTYPE_MONITOR)
 737                 rdev->num_running_monitor_ifaces += num;
 738 }
 739
 740 void cfg80211_leave(struct cfg80211_registered_device *rdev,
 741                     struct wireless_dev *wdev)
 742 {
 743         struct net_device *dev = wdev->netdev;
 744
 745         switch (wdev->iftype) {
 746         case NL80211_IFTYPE_ADHOC:
 747                 cfg80211_leave_ibss(rdev, dev, true);
 748                 break;
 749         case NL80211_IFTYPE_P2P_CLIENT:
 750         case NL80211_IFTYPE_STATION:
 751                 __cfg80211_stop_sched_scan(rdev, false);
 752
 753                 wdev_lock(wdev);
 754 #ifdef CONFIG_CFG80211_WEXT
 755                 kfree(wdev->wext.ie);
 756                 wdev->wext.ie = NULL;
 757                 wdev->wext.ie_len = 0;
 758                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 759 #endif
 760                 cfg80211_disconnect(rdev, dev,
 761                                     WLAN_REASON_DEAUTH_LEAVING, true);
 762                 wdev_unlock(wdev);
 763                 break;
 764         case NL80211_IFTYPE_MESH_POINT:
 765                 cfg80211_leave_mesh(rdev, dev);
 766                 break;
 767         case NL80211_IFTYPE_AP:
 768                 cfg80211_stop_ap(rdev, dev);
 769                 break;
 770         default:
 771                 break;
 772         }
 773
 774         wdev->beacon_interval = 0;
 775 }
 776
 777 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 778                                          unsigned long state, void *ptr)
 779 {
 780         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 781         struct wireless_dev *wdev = dev->ieee80211_ptr;
 782         struct cfg80211_registered_device *rdev;
 783         int ret;
 784
 785         if (!wdev)
 786                 return NOTIFY_DONE;
 787
 788         rdev = wiphy_to_dev(wdev->wiphy);
 789
 790         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 791
 792         switch (state) {
 793         case NETDEV_POST_INIT:
 794                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 795                 break;
 796         case NETDEV_REGISTER:
 797                 /*
 798                  * NB: cannot take rdev->mtx here because this may be
 799                  * called within code protected by it when interfaces
 800                  * are added with nl80211.
 801                  */
 802                 mutex_init(&wdev->mtx);
 803                 INIT_LIST_HEAD(&wdev->event_list);
 804                 spin_lock_init(&wdev->event_lock);
 805                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
 806                 spin_lock_init(&wdev->mgmt_registrations_lock);
 807
 808                 wdev->identifier = ++rdev->wdev_id;
 809                 list_add_rcu(&wdev->list, &rdev->wdev_list);
 810                 rdev->devlist_generation++;
 811                 /* can only change netns with wiphy */
 812                 dev->features |= NETIF_F_NETNS_LOCAL;
 813
 814                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 815                                       "phy80211")) {
 816                         pr_err("failed to add phy80211 symlink to netdev!\n");
 817                 }
 818                 wdev->netdev = dev;
 819                 wdev->sme_state = CFG80211_SME_IDLE;
 820 #ifdef CONFIG_CFG80211_WEXT
 821                 wdev->wext.default_key = -1;
 822                 wdev->wext.default_mgmt_key = -1;
 823                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 824 #endif
 825
 826                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
 827                         wdev->ps = true;
 828                 else
 829                         wdev->ps = false;
 830                 /* allow mac80211 to determine the timeout */
 831                 wdev->ps_timeout = -1;
 832
 833                 netdev_set_default_ethtool_ops(dev, &cfg80211_ethtool_ops);
 834
 835                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 836                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
 837                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
 838                         dev->priv_flags |= IFF_DONT_BRIDGE;
 839                 break;
 840         case NETDEV_GOING_DOWN:
 841                 cfg80211_leave(rdev, wdev);
 842                 break;
 843         case NETDEV_DOWN:
 844                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
 845                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 846                         if (WARN_ON(!rdev->scan_req->notified))
 847                                 rdev->scan_req->aborted = true;
 848                         ___cfg80211_scan_done(rdev, true);
 849                 }
 850
 851                 if (WARN_ON(rdev->sched_scan_req &&
 852                             rdev->sched_scan_req->dev == wdev->netdev)) {
 853                         __cfg80211_stop_sched_scan(rdev, false);
 854                 }
 855
 856                 rdev->opencount--;
 857                 wake_up(&rdev->dev_wait);
 858                 break;
 859         case NETDEV_UP:
 860                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
 861                 wdev_lock(wdev);
 862                 switch (wdev->iftype) {
 863 #ifdef CONFIG_CFG80211_WEXT
 864                 case NL80211_IFTYPE_ADHOC:
 865                         cfg80211_ibss_wext_join(rdev, wdev);
 866                         break;
 867                 case NL80211_IFTYPE_STATION:
 868                         cfg80211_mgd_wext_connect(rdev, wdev);
 869                         break;
 870 #endif
 871 #ifdef CONFIG_MAC80211_MESH
 872                 case NL80211_IFTYPE_MESH_POINT:
 873                         {
 874                                 /* backward compat code... */
 875                                 struct mesh_setup setup;
 876                                 memcpy(&setup, &default_mesh_setup,
 877                                                 sizeof(setup));
 878                                  /* back compat only needed for mesh_id */
 879                                 setup.mesh_id = wdev->ssid;
 880                                 setup.mesh_id_len = wdev->mesh_id_up_len;
 881                                 if (wdev->mesh_id_up_len)
 882                                         __cfg80211_join_mesh(rdev, dev,
 883                                                         &setup,
 884                                                         &default_mesh_config);
 885                                 break;
 886                         }
 887 #endif
 888                 default:
 889                         break;
 890                 }
 891                 wdev_unlock(wdev);
 892                 rdev->opencount++;
 893
 894                 /*
 895                  * Configure power management to the driver here so that its
 896                  * correctly set also after interface type changes etc.
 897                  */
 898                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 899                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
 900                     rdev->ops->set_power_mgmt)
 901                         if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
 902                                                 wdev->ps_timeout)) {
 903                                 /* assume this means it's off */
 904                                 wdev->ps = false;
 905                         }
 906                 break;
 907         case NETDEV_UNREGISTER:
 908                 /*
 909                  * It is possible to get NETDEV_UNREGISTER
 910                  * multiple times. To detect that, check
 911                  * that the interface is still on the list
 912                  * of registered interfaces, and only then
 913                  * remove and clean it up.
 914                  */
 915                 if (!list_empty(&wdev->list)) {
 916                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 917                         list_del_rcu(&wdev->list);
 918                         rdev->devlist_generation++;
 919                         cfg80211_mlme_purge_registrations(wdev);
 920 #ifdef CONFIG_CFG80211_WEXT
 921                         kfree(wdev->wext.keys);
 922 #endif
 923                 }
 924                 /*
 925                  * synchronise (so that we won't find this netdev
 926                  * from other code any more) and then clear the list
 927                  * head so that the above code can safely check for
 928                  * !list_empty() to avoid double-cleanup.
 929                  */
 930                 synchronize_rcu();
 931                 INIT_LIST_HEAD(&wdev->list);
 932                 /*
 933                  * Ensure that all events have been processed and
 934                  * freed.
 935                  */
 936                 cfg80211_process_wdev_events(wdev);
 937                 break;
 938         case NETDEV_PRE_UP:
 939                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 940                         return notifier_from_errno(-EOPNOTSUPP);
 941                 if (rfkill_blocked(rdev->rfkill))
 942                         return notifier_from_errno(-ERFKILL);
 943                 ret = cfg80211_can_add_interface(rdev, wdev->iftype);
 944                 if (ret)
 945                         return notifier_from_errno(ret);
 946                 break;
 947         }
 948
 949         return NOTIFY_DONE;
 950 }
 951
 952 static struct notifier_block cfg80211_netdev_notifier = {
 953         .notifier_call = cfg80211_netdev_notifier_call,
 954 };
 955
 956 static void __net_exit cfg80211_pernet_exit(struct net *net)
 957 {
 958         struct cfg80211_registered_device *rdev;
 959
 960         rtnl_lock();
 961         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 962                 if (net_eq(wiphy_net(&rdev->wiphy), net))
 963                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
 964         }
 965         rtnl_unlock();
 966 }
 967
 968 static struct pernet_operations cfg80211_pernet_ops = {
 969         .exit = cfg80211_pernet_exit,
 970 };
 971
 972 static int __init cfg80211_init(void)
 973 {
 974         int err;
 975
 976         err = register_pernet_device(&cfg80211_pernet_ops);
 977         if (err)
 978                 goto out_fail_pernet;
 979
 980         err = wiphy_sysfs_init();
 981         if (err)
 982                 goto out_fail_sysfs;
 983
 984         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
 985         if (err)
 986                 goto out_fail_notifier;
 987
 988         err = nl80211_init();
 989         if (err)
 990                 goto out_fail_nl80211;
 991
 992         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
 993
 994         err = regulatory_init();
 995         if (err)
 996                 goto out_fail_reg;
 997
 998         cfg80211_wq = create_singlethread_workqueue("cfg80211");
 999         if (!cfg80211_wq) {
1000                 err = -ENOMEM;
1001                 goto out_fail_wq;
1002         }
1003
1004         return 0;
1005
1006 out_fail_wq:
1007         regulatory_exit();
1008 out_fail_reg:
1009         debugfs_remove(ieee80211_debugfs_dir);
1010 out_fail_nl80211:
1011         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1012 out_fail_notifier:
1013         wiphy_sysfs_exit();
1014 out_fail_sysfs:
1015         unregister_pernet_device(&cfg80211_pernet_ops);
1016 out_fail_pernet:
1017         return err;
1018 }
1019 subsys_initcall(cfg80211_init);
1020
1021 static void __exit cfg80211_exit(void)
1022 {
1023         debugfs_remove(ieee80211_debugfs_dir);
1024         nl80211_exit();
1025         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1026         wiphy_sysfs_exit();
1027         regulatory_exit();
1028         unregister_pernet_device(&cfg80211_pernet_ops);
1029         destroy_workqueue(cfg80211_wq);
1030 }
1031 module_exit(cfg80211_exit);