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                 if (WARN_ON(!rdev->scan_req->notified))
 208                         rdev->scan_req->aborted = true;
 209                 ___cfg80211_scan_done(rdev);
 210         }
 211 }
 212
 213 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 214 {
 215         struct cfg80211_registered_device *rdev = data;
 216         struct wireless_dev *wdev;
 217
 218         if (!blocked)
 219                 return 0;
 220
 221         rtnl_lock();
 222
 223         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 224                 if (wdev->netdev) {
 225                         dev_close(wdev->netdev);
 226                         continue;
 227                 }
 228                 /* otherwise, check iftype */
 229                 switch (wdev->iftype) {
 230                 case NL80211_IFTYPE_P2P_DEVICE:
 231                         cfg80211_stop_p2p_device(rdev, wdev);
 232                         break;
 233                 default:
 234                         break;
 235                 }
 236         }
 237
 238         rtnl_unlock();
 239
 240         return 0;
 241 }
 242
 243 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 244 {
 245         struct cfg80211_registered_device *rdev;
 246
 247         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 248         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 249 }
 250
 251 static void cfg80211_event_work(struct work_struct *work)
 252 {
 253         struct cfg80211_registered_device *rdev;
 254
 255         rdev = container_of(work, struct cfg80211_registered_device,
 256                             event_work);
 257
 258         rtnl_lock();
 259         cfg80211_process_rdev_events(rdev);
 260         rtnl_unlock();
 261 }
 262
 263 /* exported functions */
 264
 265 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 266 {
 267         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 268
 269         struct cfg80211_registered_device *rdev;
 270         int alloc_size;
 271
 272         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 273         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 274         WARN_ON(ops->connect && !ops->disconnect);
 275         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 276         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 277         WARN_ON(ops->add_station && !ops->del_station);
 278         WARN_ON(ops->add_mpath && !ops->del_mpath);
 279         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 280
 281         alloc_size = sizeof(*rdev) + sizeof_priv;
 282
 283         rdev = kzalloc(alloc_size, GFP_KERNEL);
 284         if (!rdev)
 285                 return NULL;
 286
 287         rdev->ops = ops;
 288
 289         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 290
 291         if (unlikely(rdev->wiphy_idx < 0)) {
 292                 /* ugh, wrapped! */
 293                 atomic_dec(&wiphy_counter);
 294                 kfree(rdev);
 295                 return NULL;
 296         }
 297
 298         /* atomic_inc_return makes it start at 1, make it start at 0 */
 299         rdev->wiphy_idx--;
 300
 301         /* give it a proper name */
 302         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 303
 304         INIT_LIST_HEAD(&rdev->wdev_list);
 305         INIT_LIST_HEAD(&rdev->beacon_registrations);
 306         spin_lock_init(&rdev->beacon_registrations_lock);
 307         spin_lock_init(&rdev->bss_lock);
 308         INIT_LIST_HEAD(&rdev->bss_list);
 309         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 310         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 311         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 312                           cfg80211_dfs_channels_update_work);
 313 #ifdef CONFIG_CFG80211_WEXT
 314         rdev->wiphy.wext = &cfg80211_wext_handler;
 315 #endif
 316
 317         device_initialize(&rdev->wiphy.dev);
 318         rdev->wiphy.dev.class = &ieee80211_class;
 319         rdev->wiphy.dev.platform_data = rdev;
 320
 321 #ifdef CONFIG_CFG80211_DEFAULT_PS
 322         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 323 #endif
 324
 325         wiphy_net_set(&rdev->wiphy, &init_net);
 326
 327         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 328         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 329                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 330                                    &rdev->rfkill_ops, rdev);
 331
 332         if (!rdev->rfkill) {
 333                 kfree(rdev);
 334                 return NULL;
 335         }
 336
 337         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 338         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 339         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 340
 341         init_waitqueue_head(&rdev->dev_wait);
 342
 343         /*
 344          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 345          * Fragmentation and RTS threshold are disabled by default with the
 346          * special -1 value.
 347          */
 348         rdev->wiphy.retry_short = 7;
 349         rdev->wiphy.retry_long = 4;
 350         rdev->wiphy.frag_threshold = (u32) -1;
 351         rdev->wiphy.rts_threshold = (u32) -1;
 352         rdev->wiphy.coverage_class = 0;
 353
 354         return &rdev->wiphy;
 355 }
 356 EXPORT_SYMBOL(wiphy_new);
 357
 358 static int wiphy_verify_combinations(struct wiphy *wiphy)
 359 {
 360         const struct ieee80211_iface_combination *c;
 361         int i, j;
 362
 363         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 364                 u32 cnt = 0;
 365                 u16 all_iftypes = 0;
 366
 367                 c = &wiphy->iface_combinations[i];
 368
 369                 /*
 370                  * Combinations with just one interface aren't real,
 371                  * however we make an exception for DFS.
 372                  */
 373                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 374                         return -EINVAL;
 375
 376                 /* Need at least one channel */
 377                 if (WARN_ON(!c->num_different_channels))
 378                         return -EINVAL;
 379
 380                 /*
 381                  * Put a sane limit on maximum number of different
 382                  * channels to simplify channel accounting code.
 383                  */
 384                 if (WARN_ON(c->num_different_channels >
 385                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 386                         return -EINVAL;
 387
 388                 /* DFS only works on one channel. */
 389                 if (WARN_ON(c->radar_detect_widths &&
 390                             (c->num_different_channels > 1)))
 391                         return -EINVAL;
 392
 393                 if (WARN_ON(!c->n_limits))
 394                         return -EINVAL;
 395
 396                 for (j = 0; j < c->n_limits; j++) {
 397                         u16 types = c->limits[j].types;
 398
 399                         /*
 400                          * interface types shouldn't overlap, this is
 401                          * used in cfg80211_can_change_interface()
 402                          */
 403                         if (WARN_ON(types & all_iftypes))
 404                                 return -EINVAL;
 405                         all_iftypes |= types;
 406
 407                         if (WARN_ON(!c->limits[j].max))
 408                                 return -EINVAL;
 409
 410                         /* Shouldn't list software iftypes in combinations! */
 411                         if (WARN_ON(wiphy->software_iftypes & types))
 412                                 return -EINVAL;
 413
 414                         /* Only a single P2P_DEVICE can be allowed */
 415                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 416                                     c->limits[j].max > 1))
 417                                 return -EINVAL;
 418
 419                         cnt += c->limits[j].max;
 420                         /*
 421                          * Don't advertise an unsupported type
 422                          * in a combination.
 423                          */
 424                         if (WARN_ON((wiphy->interface_modes & types) != types))
 425                                 return -EINVAL;
 426                 }
 427
 428                 /* You can't even choose that many! */
 429                 if (WARN_ON(cnt < c->max_interfaces))
 430                         return -EINVAL;
 431         }
 432
 433         return 0;
 434 }
 435
 436 int wiphy_register(struct wiphy *wiphy)
 437 {
 438         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 439         int res;
 440         enum ieee80211_band band;
 441         struct ieee80211_supported_band *sband;
 442         bool have_band = false;
 443         int i;
 444         u16 ifmodes = wiphy->interface_modes;
 445
 446         /*
 447          * There are major locking problems in nl80211/mac80211 for CSA,
 448          * disable for all drivers until this has been reworked.
 449          */
 450         wiphy->flags &= ~WIPHY_FLAG_HAS_CHANNEL_SWITCH;
 451
 452 #ifdef CONFIG_PM
 453         if (WARN_ON(wiphy->wowlan &&
 454                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 455                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 456                 return -EINVAL;
 457         if (WARN_ON(wiphy->wowlan &&
 458                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 459                     !wiphy->wowlan->tcp))
 460                 return -EINVAL;
 461 #endif
 462
 463         if (WARN_ON(wiphy->coalesce &&
 464                     (!wiphy->coalesce->n_rules ||
 465                      !wiphy->coalesce->n_patterns) &&
 466                     (!wiphy->coalesce->pattern_min_len ||
 467                      wiphy->coalesce->pattern_min_len >
 468                         wiphy->coalesce->pattern_max_len)))
 469                 return -EINVAL;
 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 (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 558                     (!rdev->wiphy.wowlan->pattern_min_len ||
 559                      rdev->wiphy.wowlan->pattern_min_len >
 560                                 rdev->wiphy.wowlan->pattern_max_len)))
 561                 return -EINVAL;
 562 #endif
 563
 564         /* check and set up bitrates */
 565         ieee80211_set_bitrate_flags(wiphy);
 566
 567         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 568
 569         rtnl_lock();
 570         res = device_add(&rdev->wiphy.dev);
 571         if (res) {
 572                 rtnl_unlock();
 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->regulatory_flags & REGULATORY_CUSTOM_REG) {
 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
 602         rdev->wiphy.registered = true;
 603         rtnl_unlock();
 604
 605         res = rfkill_register(rdev->rfkill);
 606         if (res) {
 607                 rfkill_destroy(rdev->rfkill);
 608                 rdev->rfkill = NULL;
 609                 wiphy_unregister(&rdev->wiphy);
 610                 return res;
 611         }
 612
 613         return 0;
 614 }
 615 EXPORT_SYMBOL(wiphy_register);
 616
 617 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 618 {
 619         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 620
 621         if (!rdev->ops->rfkill_poll)
 622                 return;
 623         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 624         rfkill_resume_polling(rdev->rfkill);
 625 }
 626 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 627
 628 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 629 {
 630         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 631
 632         rfkill_pause_polling(rdev->rfkill);
 633 }
 634 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 635
 636 void wiphy_unregister(struct wiphy *wiphy)
 637 {
 638         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 639
 640         wait_event(rdev->dev_wait, ({
 641                 int __count;
 642                 rtnl_lock();
 643                 __count = rdev->opencount;
 644                 rtnl_unlock();
 645                 __count == 0; }));
 646
 647         if (rdev->rfkill)
 648                 rfkill_unregister(rdev->rfkill);
 649
 650         rtnl_lock();
 651         rdev->wiphy.registered = false;
 652
 653         BUG_ON(!list_empty(&rdev->wdev_list));
 654
 655         /*
 656          * First remove the hardware from everywhere, this makes
 657          * it impossible to find from userspace.
 658          */
 659         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 660         list_del_rcu(&rdev->list);
 661         synchronize_rcu();
 662
 663         /*
 664          * If this device got a regulatory hint tell core its
 665          * free to listen now to a new shiny device regulatory hint
 666          */
 667         wiphy_regulatory_deregister(wiphy);
 668
 669         cfg80211_rdev_list_generation++;
 670         device_del(&rdev->wiphy.dev);
 671
 672         rtnl_unlock();
 673
 674         flush_work(&rdev->scan_done_wk);
 675         cancel_work_sync(&rdev->conn_work);
 676         flush_work(&rdev->event_work);
 677         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 678
 679 #ifdef CONFIG_PM
 680         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
 681                 rdev_set_wakeup(rdev, false);
 682 #endif
 683         cfg80211_rdev_free_wowlan(rdev);
 684         cfg80211_rdev_free_coalesce(rdev);
 685 }
 686 EXPORT_SYMBOL(wiphy_unregister);
 687
 688 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 689 {
 690         struct cfg80211_internal_bss *scan, *tmp;
 691         struct cfg80211_beacon_registration *reg, *treg;
 692         rfkill_destroy(rdev->rfkill);
 693         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 694                 list_del(&reg->list);
 695                 kfree(reg);
 696         }
 697         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 698                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 699         kfree(rdev);
 700 }
 701
 702 void wiphy_free(struct wiphy *wiphy)
 703 {
 704         put_device(&wiphy->dev);
 705 }
 706 EXPORT_SYMBOL(wiphy_free);
 707
 708 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 709 {
 710         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 711
 712         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 713                 schedule_work(&rdev->rfkill_sync);
 714 }
 715 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 716
 717 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 718 {
 719         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 720
 721         ASSERT_RTNL();
 722
 723         if (WARN_ON(wdev->netdev))
 724                 return;
 725
 726         list_del_rcu(&wdev->list);
 727         rdev->devlist_generation++;
 728
 729         switch (wdev->iftype) {
 730         case NL80211_IFTYPE_P2P_DEVICE:
 731                 cfg80211_stop_p2p_device(rdev, wdev);
 732                 break;
 733         default:
 734                 WARN_ON_ONCE(1);
 735                 break;
 736         }
 737 }
 738 EXPORT_SYMBOL(cfg80211_unregister_wdev);
 739
 740 static struct device_type wiphy_type = {
 741         .name   = "wlan",
 742 };
 743
 744 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 745                                enum nl80211_iftype iftype, int num)
 746 {
 747         ASSERT_RTNL();
 748
 749         rdev->num_running_ifaces += num;
 750         if (iftype == NL80211_IFTYPE_MONITOR)
 751                 rdev->num_running_monitor_ifaces += num;
 752 }
 753
 754 void cfg80211_leave(struct cfg80211_registered_device *rdev,
 755                     struct wireless_dev *wdev)
 756 {
 757         struct net_device *dev = wdev->netdev;
 758
 759         ASSERT_RTNL();
 760
 761         switch (wdev->iftype) {
 762         case NL80211_IFTYPE_ADHOC:
 763                 cfg80211_leave_ibss(rdev, dev, true);
 764                 break;
 765         case NL80211_IFTYPE_P2P_CLIENT:
 766         case NL80211_IFTYPE_STATION:
 767                 if (rdev->sched_scan_req && dev == rdev->sched_scan_req->dev)
 768                         __cfg80211_stop_sched_scan(rdev, false);
 769
 770                 wdev_lock(wdev);
 771 #ifdef CONFIG_CFG80211_WEXT
 772                 kfree(wdev->wext.ie);
 773                 wdev->wext.ie = NULL;
 774                 wdev->wext.ie_len = 0;
 775                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 776 #endif
 777                 cfg80211_disconnect(rdev, dev,
 778                                     WLAN_REASON_DEAUTH_LEAVING, true);
 779                 wdev_unlock(wdev);
 780                 break;
 781         case NL80211_IFTYPE_MESH_POINT:
 782                 cfg80211_leave_mesh(rdev, dev);
 783                 break;
 784         case NL80211_IFTYPE_AP:
 785         case NL80211_IFTYPE_P2P_GO:
 786                 cfg80211_stop_ap(rdev, dev);
 787                 break;
 788         default:
 789                 break;
 790         }
 791
 792         wdev->beacon_interval = 0;
 793 }
 794
 795 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 796                                          unsigned long state, void *ptr)
 797 {
 798         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 799         struct wireless_dev *wdev = dev->ieee80211_ptr;
 800         struct cfg80211_registered_device *rdev;
 801         int ret;
 802
 803         if (!wdev)
 804                 return NOTIFY_DONE;
 805
 806         rdev = wiphy_to_dev(wdev->wiphy);
 807
 808         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 809
 810         switch (state) {
 811         case NETDEV_POST_INIT:
 812                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 813                 break;
 814         case NETDEV_REGISTER:
 815                 /*
 816                  * NB: cannot take rdev->mtx here because this may be
 817                  * called within code protected by it when interfaces
 818                  * are added with nl80211.
 819                  */
 820                 mutex_init(&wdev->mtx);
 821                 INIT_LIST_HEAD(&wdev->event_list);
 822                 spin_lock_init(&wdev->event_lock);
 823                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
 824                 spin_lock_init(&wdev->mgmt_registrations_lock);
 825
 826                 wdev->identifier = ++rdev->wdev_id;
 827                 list_add_rcu(&wdev->list, &rdev->wdev_list);
 828                 rdev->devlist_generation++;
 829                 /* can only change netns with wiphy */
 830                 dev->features |= NETIF_F_NETNS_LOCAL;
 831
 832                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 833                                       "phy80211")) {
 834                         pr_err("failed to add phy80211 symlink to netdev!\n");
 835                 }
 836                 wdev->netdev = dev;
 837 #ifdef CONFIG_CFG80211_WEXT
 838                 wdev->wext.default_key = -1;
 839                 wdev->wext.default_mgmt_key = -1;
 840                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 841 #endif
 842
 843                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
 844                         wdev->ps = true;
 845                 else
 846                         wdev->ps = false;
 847                 /* allow mac80211 to determine the timeout */
 848                 wdev->ps_timeout = -1;
 849
 850                 netdev_set_default_ethtool_ops(dev, &cfg80211_ethtool_ops);
 851
 852                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 853                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
 854                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
 855                         dev->priv_flags |= IFF_DONT_BRIDGE;
 856                 break;
 857         case NETDEV_GOING_DOWN:
 858                 cfg80211_leave(rdev, wdev);
 859                 break;
 860         case NETDEV_DOWN:
 861                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
 862                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 863                         if (WARN_ON(!rdev->scan_req->notified))
 864                                 rdev->scan_req->aborted = true;
 865                         ___cfg80211_scan_done(rdev);
 866                 }
 867
 868                 if (WARN_ON(rdev->sched_scan_req &&
 869                             rdev->sched_scan_req->dev == wdev->netdev)) {
 870                         __cfg80211_stop_sched_scan(rdev, false);
 871                 }
 872
 873                 rdev->opencount--;
 874                 wake_up(&rdev->dev_wait);
 875                 break;
 876         case NETDEV_UP:
 877                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
 878                 wdev_lock(wdev);
 879                 switch (wdev->iftype) {
 880 #ifdef CONFIG_CFG80211_WEXT
 881                 case NL80211_IFTYPE_ADHOC:
 882                         cfg80211_ibss_wext_join(rdev, wdev);
 883                         break;
 884                 case NL80211_IFTYPE_STATION:
 885                         cfg80211_mgd_wext_connect(rdev, wdev);
 886                         break;
 887 #endif
 888 #ifdef CONFIG_MAC80211_MESH
 889                 case NL80211_IFTYPE_MESH_POINT:
 890                         {
 891                                 /* backward compat code... */
 892                                 struct mesh_setup setup;
 893                                 memcpy(&setup, &default_mesh_setup,
 894                                                 sizeof(setup));
 895                                  /* back compat only needed for mesh_id */
 896                                 setup.mesh_id = wdev->ssid;
 897                                 setup.mesh_id_len = wdev->mesh_id_up_len;
 898                                 if (wdev->mesh_id_up_len)
 899                                         __cfg80211_join_mesh(rdev, dev,
 900                                                         &setup,
 901                                                         &default_mesh_config);
 902                                 break;
 903                         }
 904 #endif
 905                 default:
 906                         break;
 907                 }
 908                 wdev_unlock(wdev);
 909                 rdev->opencount++;
 910
 911                 /*
 912                  * Configure power management to the driver here so that its
 913                  * correctly set also after interface type changes etc.
 914                  */
 915                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 916                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
 917                     rdev->ops->set_power_mgmt)
 918                         if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
 919                                                 wdev->ps_timeout)) {
 920                                 /* assume this means it's off */
 921                                 wdev->ps = false;
 922                         }
 923                 break;
 924         case NETDEV_UNREGISTER:
 925                 /*
 926                  * It is possible to get NETDEV_UNREGISTER
 927                  * multiple times. To detect that, check
 928                  * that the interface is still on the list
 929                  * of registered interfaces, and only then
 930                  * remove and clean it up.
 931                  */
 932                 if (!list_empty(&wdev->list)) {
 933                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 934                         list_del_rcu(&wdev->list);
 935                         rdev->devlist_generation++;
 936                         cfg80211_mlme_purge_registrations(wdev);
 937 #ifdef CONFIG_CFG80211_WEXT
 938                         kfree(wdev->wext.keys);
 939 #endif
 940                 }
 941                 /*
 942                  * synchronise (so that we won't find this netdev
 943                  * from other code any more) and then clear the list
 944                  * head so that the above code can safely check for
 945                  * !list_empty() to avoid double-cleanup.
 946                  */
 947                 synchronize_rcu();
 948                 INIT_LIST_HEAD(&wdev->list);
 949                 /*
 950                  * Ensure that all events have been processed and
 951                  * freed.
 952                  */
 953                 cfg80211_process_wdev_events(wdev);
 954
 955                 if (WARN_ON(wdev->current_bss)) {
 956                         cfg80211_unhold_bss(wdev->current_bss);
 957                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 958                         wdev->current_bss = NULL;
 959                 }
 960                 break;
 961         case NETDEV_PRE_UP:
 962                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 963                         return notifier_from_errno(-EOPNOTSUPP);
 964                 ret = cfg80211_can_add_interface(rdev, wdev->iftype);
 965                 if (ret)
 966                         return notifier_from_errno(ret);
 967                 break;
 968         }
 969
 970         return NOTIFY_DONE;
 971 }
 972
 973 static struct notifier_block cfg80211_netdev_notifier = {
 974         .notifier_call = cfg80211_netdev_notifier_call,
 975 };
 976
 977 static void __net_exit cfg80211_pernet_exit(struct net *net)
 978 {
 979         struct cfg80211_registered_device *rdev;
 980
 981         rtnl_lock();
 982         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 983                 if (net_eq(wiphy_net(&rdev->wiphy), net))
 984                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
 985         }
 986         rtnl_unlock();
 987 }
 988
 989 static struct pernet_operations cfg80211_pernet_ops = {
 990         .exit = cfg80211_pernet_exit,
 991 };
 992
 993 static int __init cfg80211_init(void)
 994 {
 995         int err;
 996
 997         err = register_pernet_device(&cfg80211_pernet_ops);
 998         if (err)
 999                 goto out_fail_pernet;
1000
1001         err = wiphy_sysfs_init();
1002         if (err)
1003                 goto out_fail_sysfs;
1004
1005         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1006         if (err)
1007                 goto out_fail_notifier;
1008
1009         err = nl80211_init();
1010         if (err)
1011                 goto out_fail_nl80211;
1012
1013         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1014
1015         err = regulatory_init();
1016         if (err)
1017                 goto out_fail_reg;
1018
1019         cfg80211_wq = create_singlethread_workqueue("cfg80211");
1020         if (!cfg80211_wq) {
1021                 err = -ENOMEM;
1022                 goto out_fail_wq;
1023         }
1024
1025         return 0;
1026
1027 out_fail_wq:
1028         regulatory_exit();
1029 out_fail_reg:
1030         debugfs_remove(ieee80211_debugfs_dir);
1031 out_fail_nl80211:
1032         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1033 out_fail_notifier:
1034         wiphy_sysfs_exit();
1035 out_fail_sysfs:
1036         unregister_pernet_device(&cfg80211_pernet_ops);
1037 out_fail_pernet:
1038         return err;
1039 }
1040 subsys_initcall(cfg80211_init);
1041
1042 static void __exit cfg80211_exit(void)
1043 {
1044         debugfs_remove(ieee80211_debugfs_dir);
1045         nl80211_exit();
1046         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1047         wiphy_sysfs_exit();
1048         regulatory_exit();
1049         unregister_pernet_device(&cfg80211_pernet_ops);
1050         destroy_workqueue(cfg80211_wq);
1051 }
1052 module_exit(cfg80211_exit);