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         /* atomic_inc_return makes it start at 1, make it start at 0 */
 305         rdev->wiphy_idx--;
 306
 307         /* give it a proper name */
 308         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 309
 310         INIT_LIST_HEAD(&rdev->wdev_list);
 311         INIT_LIST_HEAD(&rdev->beacon_registrations);
 312         spin_lock_init(&rdev->beacon_registrations_lock);
 313         spin_lock_init(&rdev->bss_lock);
 314         INIT_LIST_HEAD(&rdev->bss_list);
 315         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 316         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 317         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 318                           cfg80211_dfs_channels_update_work);
 319 #ifdef CONFIG_CFG80211_WEXT
 320         rdev->wiphy.wext = &cfg80211_wext_handler;
 321 #endif
 322
 323         device_initialize(&rdev->wiphy.dev);
 324         rdev->wiphy.dev.class = &ieee80211_class;
 325         rdev->wiphy.dev.platform_data = rdev;
 326
 327 #ifdef CONFIG_CFG80211_DEFAULT_PS
 328         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 329 #endif
 330
 331         wiphy_net_set(&rdev->wiphy, &init_net);
 332
 333         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 334         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 335                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 336                                    &rdev->rfkill_ops, rdev);
 337
 338         if (!rdev->rfkill) {
 339                 kfree(rdev);
 340                 return NULL;
 341         }
 342
 343         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 344         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 345         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 346
 347         init_waitqueue_head(&rdev->dev_wait);
 348
 349         /*
 350          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 351          * Fragmentation and RTS threshold are disabled by default with the
 352          * special -1 value.
 353          */
 354         rdev->wiphy.retry_short = 7;
 355         rdev->wiphy.retry_long = 4;
 356         rdev->wiphy.frag_threshold = (u32) -1;
 357         rdev->wiphy.rts_threshold = (u32) -1;
 358         rdev->wiphy.coverage_class = 0;
 359
 360         rdev->wiphy.features = NL80211_FEATURE_SCAN_FLUSH;
 361
 362         return &rdev->wiphy;
 363 }
 364 EXPORT_SYMBOL(wiphy_new);
 365
 366 static int wiphy_verify_combinations(struct wiphy *wiphy)
 367 {
 368         const struct ieee80211_iface_combination *c;
 369         int i, j;
 370
 371         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 372                 u32 cnt = 0;
 373                 u16 all_iftypes = 0;
 374
 375                 c = &wiphy->iface_combinations[i];
 376
 377                 /*
 378                  * Combinations with just one interface aren't real,
 379                  * however we make an exception for DFS.
 380                  */
 381                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 382                         return -EINVAL;
 383
 384                 /* Need at least one channel */
 385                 if (WARN_ON(!c->num_different_channels))
 386                         return -EINVAL;
 387
 388                 /*
 389                  * Put a sane limit on maximum number of different
 390                  * channels to simplify channel accounting code.
 391                  */
 392                 if (WARN_ON(c->num_different_channels >
 393                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 394                         return -EINVAL;
 395
 396                 /* DFS only works on one channel. */
 397                 if (WARN_ON(c->radar_detect_widths &&
 398                             (c->num_different_channels > 1)))
 399                         return -EINVAL;
 400
 401                 if (WARN_ON(!c->n_limits))
 402                         return -EINVAL;
 403
 404                 for (j = 0; j < c->n_limits; j++) {
 405                         u16 types = c->limits[j].types;
 406
 407                         /*
 408                          * interface types shouldn't overlap, this is
 409                          * used in cfg80211_can_change_interface()
 410                          */
 411                         if (WARN_ON(types & all_iftypes))
 412                                 return -EINVAL;
 413                         all_iftypes |= types;
 414
 415                         if (WARN_ON(!c->limits[j].max))
 416                                 return -EINVAL;
 417
 418                         /* Shouldn't list software iftypes in combinations! */
 419                         if (WARN_ON(wiphy->software_iftypes & types))
 420                                 return -EINVAL;
 421
 422                         /* Only a single P2P_DEVICE can be allowed */
 423                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 424                                     c->limits[j].max > 1))
 425                                 return -EINVAL;
 426
 427                         cnt += c->limits[j].max;
 428                         /*
 429                          * Don't advertise an unsupported type
 430                          * in a combination.
 431                          */
 432                         if (WARN_ON((wiphy->interface_modes & types) != types))
 433                                 return -EINVAL;
 434                 }
 435
 436                 /* You can't even choose that many! */
 437                 if (WARN_ON(cnt < c->max_interfaces))
 438                         return -EINVAL;
 439         }
 440
 441         return 0;
 442 }
 443
 444 int wiphy_register(struct wiphy *wiphy)
 445 {
 446         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 447         int res;
 448         enum ieee80211_band band;
 449         struct ieee80211_supported_band *sband;
 450         bool have_band = false;
 451         int i;
 452         u16 ifmodes = wiphy->interface_modes;
 453
 454 #ifdef CONFIG_PM
 455         if (WARN_ON(wiphy->wowlan &&
 456                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 457                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 458                 return -EINVAL;
 459         if (WARN_ON(wiphy->wowlan &&
 460                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 461                     !wiphy->wowlan->tcp))
 462                 return -EINVAL;
 463 #endif
 464
 465         if (WARN_ON(wiphy->coalesce &&
 466                     (!wiphy->coalesce->n_rules ||
 467                      !wiphy->coalesce->n_patterns) &&
 468                     (!wiphy->coalesce->pattern_min_len ||
 469                      wiphy->coalesce->pattern_min_len >
 470                         wiphy->coalesce->pattern_max_len)))
 471                 return -EINVAL;
 472
 473         if (WARN_ON(wiphy->ap_sme_capa &&
 474                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 475                 return -EINVAL;
 476
 477         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 478                 return -EINVAL;
 479
 480         if (WARN_ON(wiphy->addresses &&
 481                     !is_zero_ether_addr(wiphy->perm_addr) &&
 482                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 483                            ETH_ALEN)))
 484                 return -EINVAL;
 485
 486         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 487                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 488                      !rdev->ops->set_mac_acl)))
 489                 return -EINVAL;
 490
 491         if (wiphy->addresses)
 492                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 493
 494         /* sanity check ifmodes */
 495         WARN_ON(!ifmodes);
 496         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 497         if (WARN_ON(ifmodes != wiphy->interface_modes))
 498                 wiphy->interface_modes = ifmodes;
 499
 500         res = wiphy_verify_combinations(wiphy);
 501         if (res)
 502                 return res;
 503
 504         /* sanity check supported bands/channels */
 505         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 506                 sband = wiphy->bands[band];
 507                 if (!sband)
 508                         continue;
 509
 510                 sband->band = band;
 511                 if (WARN_ON(!sband->n_channels))
 512                         return -EINVAL;
 513                 /*
 514                  * on 60gHz band, there are no legacy rates, so
 515                  * n_bitrates is 0
 516                  */
 517                 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
 518                             !sband->n_bitrates))
 519                         return -EINVAL;
 520
 521                 /*
 522                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 523                  * modify the sband's ht data even if the driver uses a
 524                  * global structure for that.
 525                  */
 526                 if (cfg80211_disable_40mhz_24ghz &&
 527                     band == IEEE80211_BAND_2GHZ &&
 528                     sband->ht_cap.ht_supported) {
 529                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 530                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 531                 }
 532
 533                 /*
 534                  * Since we use a u32 for rate bitmaps in
 535                  * ieee80211_get_response_rate, we cannot
 536                  * have more than 32 legacy rates.
 537                  */
 538                 if (WARN_ON(sband->n_bitrates > 32))
 539                         return -EINVAL;
 540
 541                 for (i = 0; i < sband->n_channels; i++) {
 542                         sband->channels[i].orig_flags =
 543                                 sband->channels[i].flags;
 544                         sband->channels[i].orig_mag = INT_MAX;
 545                         sband->channels[i].orig_mpwr =
 546                                 sband->channels[i].max_power;
 547                         sband->channels[i].band = band;
 548                 }
 549
 550                 have_band = true;
 551         }
 552
 553         if (!have_band) {
 554                 WARN_ON(1);
 555                 return -EINVAL;
 556         }
 557
 558 #ifdef CONFIG_PM
 559         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 560                     (!rdev->wiphy.wowlan->pattern_min_len ||
 561                      rdev->wiphy.wowlan->pattern_min_len >
 562                                 rdev->wiphy.wowlan->pattern_max_len)))
 563                 return -EINVAL;
 564 #endif
 565
 566         /* check and set up bitrates */
 567         ieee80211_set_bitrate_flags(wiphy);
 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->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
 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         switch (wdev->iftype) {
 760         case NL80211_IFTYPE_ADHOC:
 761                 cfg80211_leave_ibss(rdev, dev, true);
 762                 break;
 763         case NL80211_IFTYPE_P2P_CLIENT:
 764         case NL80211_IFTYPE_STATION:
 765                 __cfg80211_stop_sched_scan(rdev, false);
 766
 767                 wdev_lock(wdev);
 768 #ifdef CONFIG_CFG80211_WEXT
 769                 kfree(wdev->wext.ie);
 770                 wdev->wext.ie = NULL;
 771                 wdev->wext.ie_len = 0;
 772                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 773 #endif
 774                 cfg80211_disconnect(rdev, dev,
 775                                     WLAN_REASON_DEAUTH_LEAVING, true);
 776                 wdev_unlock(wdev);
 777                 break;
 778         case NL80211_IFTYPE_MESH_POINT:
 779                 cfg80211_leave_mesh(rdev, dev);
 780                 break;
 781         case NL80211_IFTYPE_AP:
 782         case NL80211_IFTYPE_P2P_GO:
 783                 cfg80211_stop_ap(rdev, dev);
 784                 break;
 785         default:
 786                 break;
 787         }
 788
 789         wdev->beacon_interval = 0;
 790 }
 791
 792 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 793                                          unsigned long state, void *ptr)
 794 {
 795         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 796         struct wireless_dev *wdev = dev->ieee80211_ptr;
 797         struct cfg80211_registered_device *rdev;
 798         int ret;
 799
 800         if (!wdev)
 801                 return NOTIFY_DONE;
 802
 803         rdev = wiphy_to_dev(wdev->wiphy);
 804
 805         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 806
 807         switch (state) {
 808         case NETDEV_POST_INIT:
 809                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 810                 break;
 811         case NETDEV_REGISTER:
 812                 /*
 813                  * NB: cannot take rdev->mtx here because this may be
 814                  * called within code protected by it when interfaces
 815                  * are added with nl80211.
 816                  */
 817                 mutex_init(&wdev->mtx);
 818                 INIT_LIST_HEAD(&wdev->event_list);
 819                 spin_lock_init(&wdev->event_lock);
 820                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
 821                 spin_lock_init(&wdev->mgmt_registrations_lock);
 822
 823                 wdev->identifier = ++rdev->wdev_id;
 824                 list_add_rcu(&wdev->list, &rdev->wdev_list);
 825                 rdev->devlist_generation++;
 826                 /* can only change netns with wiphy */
 827                 dev->features |= NETIF_F_NETNS_LOCAL;
 828
 829                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 830                                       "phy80211")) {
 831                         pr_err("failed to add phy80211 symlink to netdev!\n");
 832                 }
 833                 wdev->netdev = dev;
 834 #ifdef CONFIG_CFG80211_WEXT
 835                 wdev->wext.default_key = -1;
 836                 wdev->wext.default_mgmt_key = -1;
 837                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 838 #endif
 839
 840                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
 841                         wdev->ps = true;
 842                 else
 843                         wdev->ps = false;
 844                 /* allow mac80211 to determine the timeout */
 845                 wdev->ps_timeout = -1;
 846
 847                 netdev_set_default_ethtool_ops(dev, &cfg80211_ethtool_ops);
 848
 849                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 850                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
 851                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
 852                         dev->priv_flags |= IFF_DONT_BRIDGE;
 853                 break;
 854         case NETDEV_GOING_DOWN:
 855                 cfg80211_leave(rdev, wdev);
 856                 break;
 857         case NETDEV_DOWN:
 858                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
 859                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 860                         if (WARN_ON(!rdev->scan_req->notified))
 861                                 rdev->scan_req->aborted = true;
 862                         ___cfg80211_scan_done(rdev, true);
 863                 }
 864
 865                 if (WARN_ON(rdev->sched_scan_req &&
 866                             rdev->sched_scan_req->dev == wdev->netdev)) {
 867                         __cfg80211_stop_sched_scan(rdev, false);
 868                 }
 869
 870                 rdev->opencount--;
 871                 wake_up(&rdev->dev_wait);
 872                 break;
 873         case NETDEV_UP:
 874                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
 875                 wdev_lock(wdev);
 876                 switch (wdev->iftype) {
 877 #ifdef CONFIG_CFG80211_WEXT
 878                 case NL80211_IFTYPE_ADHOC:
 879                         cfg80211_ibss_wext_join(rdev, wdev);
 880                         break;
 881                 case NL80211_IFTYPE_STATION:
 882                         cfg80211_mgd_wext_connect(rdev, wdev);
 883                         break;
 884 #endif
 885 #ifdef CONFIG_MAC80211_MESH
 886                 case NL80211_IFTYPE_MESH_POINT:
 887                         {
 888                                 /* backward compat code... */
 889                                 struct mesh_setup setup;
 890                                 memcpy(&setup, &default_mesh_setup,
 891                                                 sizeof(setup));
 892                                  /* back compat only needed for mesh_id */
 893                                 setup.mesh_id = wdev->ssid;
 894                                 setup.mesh_id_len = wdev->mesh_id_up_len;
 895                                 if (wdev->mesh_id_up_len)
 896                                         __cfg80211_join_mesh(rdev, dev,
 897                                                         &setup,
 898                                                         &default_mesh_config);
 899                                 break;
 900                         }
 901 #endif
 902                 default:
 903                         break;
 904                 }
 905                 wdev_unlock(wdev);
 906                 rdev->opencount++;
 907
 908                 /*
 909                  * Configure power management to the driver here so that its
 910                  * correctly set also after interface type changes etc.
 911                  */
 912                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 913                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
 914                     rdev->ops->set_power_mgmt)
 915                         if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
 916                                                 wdev->ps_timeout)) {
 917                                 /* assume this means it's off */
 918                                 wdev->ps = false;
 919                         }
 920                 break;
 921         case NETDEV_UNREGISTER:
 922                 /*
 923                  * It is possible to get NETDEV_UNREGISTER
 924                  * multiple times. To detect that, check
 925                  * that the interface is still on the list
 926                  * of registered interfaces, and only then
 927                  * remove and clean it up.
 928                  */
 929                 if (!list_empty(&wdev->list)) {
 930                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
 931                         list_del_rcu(&wdev->list);
 932                         rdev->devlist_generation++;
 933                         cfg80211_mlme_purge_registrations(wdev);
 934 #ifdef CONFIG_CFG80211_WEXT
 935                         kfree(wdev->wext.keys);
 936 #endif
 937                 }
 938                 /*
 939                  * synchronise (so that we won't find this netdev
 940                  * from other code any more) and then clear the list
 941                  * head so that the above code can safely check for
 942                  * !list_empty() to avoid double-cleanup.
 943                  */
 944                 synchronize_rcu();
 945                 INIT_LIST_HEAD(&wdev->list);
 946                 /*
 947                  * Ensure that all events have been processed and
 948                  * freed.
 949                  */
 950                 cfg80211_process_wdev_events(wdev);
 951
 952                 if (WARN_ON(wdev->current_bss)) {
 953                         cfg80211_unhold_bss(wdev->current_bss);
 954                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 955                         wdev->current_bss = NULL;
 956                 }
 957                 break;
 958         case NETDEV_PRE_UP:
 959                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
 960                         return notifier_from_errno(-EOPNOTSUPP);
 961                 ret = cfg80211_can_add_interface(rdev, wdev->iftype);
 962                 if (ret)
 963                         return notifier_from_errno(ret);
 964                 break;
 965         }
 966
 967         return NOTIFY_DONE;
 968 }
 969
 970 static struct notifier_block cfg80211_netdev_notifier = {
 971         .notifier_call = cfg80211_netdev_notifier_call,
 972 };
 973
 974 static void __net_exit cfg80211_pernet_exit(struct net *net)
 975 {
 976         struct cfg80211_registered_device *rdev;
 977
 978         rtnl_lock();
 979         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 980                 if (net_eq(wiphy_net(&rdev->wiphy), net))
 981                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
 982         }
 983         rtnl_unlock();
 984 }
 985
 986 static struct pernet_operations cfg80211_pernet_ops = {
 987         .exit = cfg80211_pernet_exit,
 988 };
 989
 990 static int __init cfg80211_init(void)
 991 {
 992         int err;
 993
 994         err = register_pernet_device(&cfg80211_pernet_ops);
 995         if (err)
 996                 goto out_fail_pernet;
 997
 998         err = wiphy_sysfs_init();
 999         if (err)
1000                 goto out_fail_sysfs;
1001
1002         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1003         if (err)
1004                 goto out_fail_notifier;
1005
1006         err = nl80211_init();
1007         if (err)
1008                 goto out_fail_nl80211;
1009
1010         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1011
1012         err = regulatory_init();
1013         if (err)
1014                 goto out_fail_reg;
1015
1016         cfg80211_wq = create_singlethread_workqueue("cfg80211");
1017         if (!cfg80211_wq) {
1018                 err = -ENOMEM;
1019                 goto out_fail_wq;
1020         }
1021
1022         return 0;
1023
1024 out_fail_wq:
1025         regulatory_exit();
1026 out_fail_reg:
1027         debugfs_remove(ieee80211_debugfs_dir);
1028 out_fail_nl80211:
1029         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1030 out_fail_notifier:
1031         wiphy_sysfs_exit();
1032 out_fail_sysfs:
1033         unregister_pernet_device(&cfg80211_pernet_ops);
1034 out_fail_pernet:
1035         return err;
1036 }
1037 subsys_initcall(cfg80211_init);
1038
1039 static void __exit cfg80211_exit(void)
1040 {
1041         debugfs_remove(ieee80211_debugfs_dir);
1042         nl80211_exit();
1043         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1044         wiphy_sysfs_exit();
1045         regulatory_exit();
1046         unregister_pernet_device(&cfg80211_pernet_ops);
1047         destroy_workqueue(cfg80211_wq);
1048 }
1049 module_exit(cfg80211_exit);