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 "rdev-ops.h"
  29
  30 /* name for sysfs, %d is appended */
  31 #define PHY_NAME "phy"
  32
  33 MODULE_AUTHOR("Johannes Berg");
  34 MODULE_LICENSE("GPL");
  35 MODULE_DESCRIPTION("wireless configuration support");
  36 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
  37
  38 /* RCU-protected (and RTNL for writers) */
  39 LIST_HEAD(cfg80211_rdev_list);
  40 int cfg80211_rdev_list_generation;
  41
  42 /* for debugfs */
  43 static struct dentry *ieee80211_debugfs_dir;
  44
  45 /* for the cleanup, scan and event works */
  46 struct workqueue_struct *cfg80211_wq;
  47
  48 static bool cfg80211_disable_40mhz_24ghz;
  49 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  50 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  51                  "Disable 40MHz support in the 2.4GHz band");
  52
  53 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  54 {
  55         struct cfg80211_registered_device *result = NULL, *rdev;
  56
  57         ASSERT_RTNL();
  58
  59         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  60                 if (rdev->wiphy_idx == wiphy_idx) {
  61                         result = rdev;
  62                         break;
  63                 }
  64         }
  65
  66         return result;
  67 }
  68
  69 int get_wiphy_idx(struct wiphy *wiphy)
  70 {
  71         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
  72
  73         return rdev->wiphy_idx;
  74 }
  75
  76 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  77 {
  78         struct cfg80211_registered_device *rdev;
  79
  80         ASSERT_RTNL();
  81
  82         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  83         if (!rdev)
  84                 return NULL;
  85         return &rdev->wiphy;
  86 }
  87
  88 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
  89                         char *newname)
  90 {
  91         struct cfg80211_registered_device *rdev2;
  92         int wiphy_idx, taken = -1, result, digits;
  93
  94         ASSERT_RTNL();
  95
  96         /* prohibit calling the thing phy%d when %d is not its number */
  97         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
  98         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
  99                 /* count number of places needed to print wiphy_idx */
 100                 digits = 1;
 101                 while (wiphy_idx /= 10)
 102                         digits++;
 103                 /*
 104                  * deny the name if it is phy<idx> where <idx> is printed
 105                  * without leading zeroes. taken == strlen(newname) here
 106                  */
 107                 if (taken == strlen(PHY_NAME) + digits)
 108                         return -EINVAL;
 109         }
 110
 111
 112         /* Ignore nop renames */
 113         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
 114                 return 0;
 115
 116         /* Ensure another device does not already have this name. */
 117         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 118                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
 119                         return -EINVAL;
 120
 121         result = device_rename(&rdev->wiphy.dev, newname);
 122         if (result)
 123                 return result;
 124
 125         if (rdev->wiphy.debugfsdir &&
 126             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 127                             rdev->wiphy.debugfsdir,
 128                             rdev->wiphy.debugfsdir->d_parent,
 129                             newname))
 130                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 131
 132         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 133
 134         return 0;
 135 }
 136
 137 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 138                           struct net *net)
 139 {
 140         struct wireless_dev *wdev;
 141         int err = 0;
 142
 143         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 144                 return -EOPNOTSUPP;
 145
 146         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 147                 if (!wdev->netdev)
 148                         continue;
 149                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 150                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 151                 if (err)
 152                         break;
 153                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 154         }
 155
 156         if (err) {
 157                 /* failed -- clean up to old netns */
 158                 net = wiphy_net(&rdev->wiphy);
 159
 160                 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,
 161                                                      list) {
 162                         if (!wdev->netdev)
 163                                 continue;
 164                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 165                         err = dev_change_net_namespace(wdev->netdev, net,
 166                                                         "wlan%d");
 167                         WARN_ON(err);
 168                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 169                 }
 170
 171                 return err;
 172         }
 173
 174         wiphy_net_set(&rdev->wiphy, net);
 175
 176         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 177         WARN_ON(err);
 178
 179         return 0;
 180 }
 181
 182 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 183 {
 184         struct cfg80211_registered_device *rdev = data;
 185
 186         rdev_rfkill_poll(rdev);
 187 }
 188
 189 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 190                               struct wireless_dev *wdev)
 191 {
 192         ASSERT_RTNL();
 193
 194         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 195                 return;
 196
 197         if (!wdev->p2p_started)
 198                 return;
 199
 200         rdev_stop_p2p_device(rdev, wdev);
 201         wdev->p2p_started = false;
 202
 203         rdev->opencount--;
 204
 205         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 206                 if (WARN_ON(!rdev->scan_req->notified))
 207                         rdev->scan_req->aborted = true;
 208                 ___cfg80211_scan_done(rdev, false);
 209         }
 210 }
 211
 212 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 213 {
 214         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 215         struct wireless_dev *wdev;
 216
 217         ASSERT_RTNL();
 218
 219         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 220                 if (wdev->netdev) {
 221                         dev_close(wdev->netdev);
 222                         continue;
 223                 }
 224                 /* otherwise, check iftype */
 225                 switch (wdev->iftype) {
 226                 case NL80211_IFTYPE_P2P_DEVICE:
 227                         cfg80211_stop_p2p_device(rdev, wdev);
 228                         break;
 229                 default:
 230                         break;
 231                 }
 232         }
 233 }
 234 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 235
 236 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 237 {
 238         struct cfg80211_registered_device *rdev = data;
 239
 240         if (!blocked)
 241                 return 0;
 242
 243         rtnl_lock();
 244         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 245         rtnl_unlock();
 246
 247         return 0;
 248 }
 249
 250 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 251 {
 252         struct cfg80211_registered_device *rdev;
 253
 254         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 255         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 256 }
 257
 258 static void cfg80211_event_work(struct work_struct *work)
 259 {
 260         struct cfg80211_registered_device *rdev;
 261
 262         rdev = container_of(work, struct cfg80211_registered_device,
 263                             event_work);
 264
 265         rtnl_lock();
 266         cfg80211_process_rdev_events(rdev);
 267         rtnl_unlock();
 268 }
 269
 270 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 271 {
 272         struct cfg80211_iface_destroy *item;
 273
 274         ASSERT_RTNL();
 275
 276         spin_lock_irq(&rdev->destroy_list_lock);
 277         while ((item = list_first_entry_or_null(&rdev->destroy_list,
 278                                                 struct cfg80211_iface_destroy,
 279                                                 list))) {
 280                 struct wireless_dev *wdev, *tmp;
 281                 u32 nlportid = item->nlportid;
 282
 283                 list_del(&item->list);
 284                 kfree(item);
 285                 spin_unlock_irq(&rdev->destroy_list_lock);
 286
 287                 list_for_each_entry_safe(wdev, tmp, &rdev->wdev_list, list) {
 288                         if (nlportid == wdev->owner_nlportid)
 289                                 rdev_del_virtual_intf(rdev, wdev);
 290                 }
 291
 292                 spin_lock_irq(&rdev->destroy_list_lock);
 293         }
 294         spin_unlock_irq(&rdev->destroy_list_lock);
 295 }
 296
 297 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 298 {
 299         struct cfg80211_registered_device *rdev;
 300
 301         rdev = container_of(work, struct cfg80211_registered_device,
 302                             destroy_work);
 303
 304         rtnl_lock();
 305         cfg80211_destroy_ifaces(rdev);
 306         rtnl_unlock();
 307 }
 308
 309 /* exported functions */
 310
 311 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 312 {
 313         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 314
 315         struct cfg80211_registered_device *rdev;
 316         int alloc_size;
 317
 318         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 319         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 320         WARN_ON(ops->connect && !ops->disconnect);
 321         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 322         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 323         WARN_ON(ops->add_station && !ops->del_station);
 324         WARN_ON(ops->add_mpath && !ops->del_mpath);
 325         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 326
 327         alloc_size = sizeof(*rdev) + sizeof_priv;
 328
 329         rdev = kzalloc(alloc_size, GFP_KERNEL);
 330         if (!rdev)
 331                 return NULL;
 332
 333         rdev->ops = ops;
 334
 335         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 336
 337         if (unlikely(rdev->wiphy_idx < 0)) {
 338                 /* ugh, wrapped! */
 339                 atomic_dec(&wiphy_counter);
 340                 kfree(rdev);
 341                 return NULL;
 342         }
 343
 344         /* atomic_inc_return makes it start at 1, make it start at 0 */
 345         rdev->wiphy_idx--;
 346
 347         /* give it a proper name */
 348         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 349
 350         INIT_LIST_HEAD(&rdev->wdev_list);
 351         INIT_LIST_HEAD(&rdev->beacon_registrations);
 352         spin_lock_init(&rdev->beacon_registrations_lock);
 353         spin_lock_init(&rdev->bss_lock);
 354         INIT_LIST_HEAD(&rdev->bss_list);
 355         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 356         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 357         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 358                           cfg80211_dfs_channels_update_work);
 359 #ifdef CONFIG_CFG80211_WEXT
 360         rdev->wiphy.wext = &cfg80211_wext_handler;
 361 #endif
 362
 363         device_initialize(&rdev->wiphy.dev);
 364         rdev->wiphy.dev.class = &ieee80211_class;
 365         rdev->wiphy.dev.platform_data = rdev;
 366
 367         INIT_LIST_HEAD(&rdev->destroy_list);
 368         spin_lock_init(&rdev->destroy_list_lock);
 369         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 370
 371 #ifdef CONFIG_CFG80211_DEFAULT_PS
 372         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 373 #endif
 374
 375         wiphy_net_set(&rdev->wiphy, &init_net);
 376
 377         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 378         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 379                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 380                                    &rdev->rfkill_ops, rdev);
 381
 382         if (!rdev->rfkill) {
 383                 kfree(rdev);
 384                 return NULL;
 385         }
 386
 387         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 388         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 389         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 390
 391         init_waitqueue_head(&rdev->dev_wait);
 392
 393         /*
 394          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 395          * Fragmentation and RTS threshold are disabled by default with the
 396          * special -1 value.
 397          */
 398         rdev->wiphy.retry_short = 7;
 399         rdev->wiphy.retry_long = 4;
 400         rdev->wiphy.frag_threshold = (u32) -1;
 401         rdev->wiphy.rts_threshold = (u32) -1;
 402         rdev->wiphy.coverage_class = 0;
 403
 404         rdev->wiphy.max_num_csa_counters = 1;
 405
 406         return &rdev->wiphy;
 407 }
 408 EXPORT_SYMBOL(wiphy_new);
 409
 410 static int wiphy_verify_combinations(struct wiphy *wiphy)
 411 {
 412         const struct ieee80211_iface_combination *c;
 413         int i, j;
 414
 415         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 416                 u32 cnt = 0;
 417                 u16 all_iftypes = 0;
 418
 419                 c = &wiphy->iface_combinations[i];
 420
 421                 /*
 422                  * Combinations with just one interface aren't real,
 423                  * however we make an exception for DFS.
 424                  */
 425                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 426                         return -EINVAL;
 427
 428                 /* Need at least one channel */
 429                 if (WARN_ON(!c->num_different_channels))
 430                         return -EINVAL;
 431
 432                 /*
 433                  * Put a sane limit on maximum number of different
 434                  * channels to simplify channel accounting code.
 435                  */
 436                 if (WARN_ON(c->num_different_channels >
 437                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 438                         return -EINVAL;
 439
 440                 /* DFS only works on one channel. */
 441                 if (WARN_ON(c->radar_detect_widths &&
 442                             (c->num_different_channels > 1)))
 443                         return -EINVAL;
 444
 445                 if (WARN_ON(!c->n_limits))
 446                         return -EINVAL;
 447
 448                 for (j = 0; j < c->n_limits; j++) {
 449                         u16 types = c->limits[j].types;
 450
 451                         /* interface types shouldn't overlap */
 452                         if (WARN_ON(types & all_iftypes))
 453                                 return -EINVAL;
 454                         all_iftypes |= types;
 455
 456                         if (WARN_ON(!c->limits[j].max))
 457                                 return -EINVAL;
 458
 459                         /* Shouldn't list software iftypes in combinations! */
 460                         if (WARN_ON(wiphy->software_iftypes & types))
 461                                 return -EINVAL;
 462
 463                         /* Only a single P2P_DEVICE can be allowed */
 464                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 465                                     c->limits[j].max > 1))
 466                                 return -EINVAL;
 467
 468                         cnt += c->limits[j].max;
 469                         /*
 470                          * Don't advertise an unsupported type
 471                          * in a combination.
 472                          */
 473                         if (WARN_ON((wiphy->interface_modes & types) != types))
 474                                 return -EINVAL;
 475                 }
 476
 477                 /* You can't even choose that many! */
 478                 if (WARN_ON(cnt < c->max_interfaces))
 479                         return -EINVAL;
 480         }
 481
 482         return 0;
 483 }
 484
 485 int wiphy_register(struct wiphy *wiphy)
 486 {
 487         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 488         int res;
 489         enum ieee80211_band band;
 490         struct ieee80211_supported_band *sband;
 491         bool have_band = false;
 492         int i;
 493         u16 ifmodes = wiphy->interface_modes;
 494
 495         /*
 496          * There are major locking problems in nl80211/mac80211 for CSA,
 497          * disable for all drivers until this has been reworked.
 498          */
 499         wiphy->flags &= ~WIPHY_FLAG_HAS_CHANNEL_SWITCH;
 500
 501 #ifdef CONFIG_PM
 502         if (WARN_ON(wiphy->wowlan &&
 503                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 504                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 505                 return -EINVAL;
 506         if (WARN_ON(wiphy->wowlan &&
 507                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 508                     !wiphy->wowlan->tcp))
 509                 return -EINVAL;
 510 #endif
 511
 512         if (WARN_ON(wiphy->coalesce &&
 513                     (!wiphy->coalesce->n_rules ||
 514                      !wiphy->coalesce->n_patterns) &&
 515                     (!wiphy->coalesce->pattern_min_len ||
 516                      wiphy->coalesce->pattern_min_len >
 517                         wiphy->coalesce->pattern_max_len)))
 518                 return -EINVAL;
 519
 520         if (WARN_ON(wiphy->ap_sme_capa &&
 521                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 522                 return -EINVAL;
 523
 524         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 525                 return -EINVAL;
 526
 527         if (WARN_ON(wiphy->addresses &&
 528                     !is_zero_ether_addr(wiphy->perm_addr) &&
 529                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 530                            ETH_ALEN)))
 531                 return -EINVAL;
 532
 533         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 534                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 535                      !rdev->ops->set_mac_acl)))
 536                 return -EINVAL;
 537
 538         if (wiphy->addresses)
 539                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 540
 541         /* sanity check ifmodes */
 542         WARN_ON(!ifmodes);
 543         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 544         if (WARN_ON(ifmodes != wiphy->interface_modes))
 545                 wiphy->interface_modes = ifmodes;
 546
 547         res = wiphy_verify_combinations(wiphy);
 548         if (res)
 549                 return res;
 550
 551         /* sanity check supported bands/channels */
 552         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 553                 sband = wiphy->bands[band];
 554                 if (!sband)
 555                         continue;
 556
 557                 sband->band = band;
 558                 if (WARN_ON(!sband->n_channels))
 559                         return -EINVAL;
 560                 /*
 561                  * on 60gHz band, there are no legacy rates, so
 562                  * n_bitrates is 0
 563                  */
 564                 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
 565                             !sband->n_bitrates))
 566                         return -EINVAL;
 567
 568                 /*
 569                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 570                  * modify the sband's ht data even if the driver uses a
 571                  * global structure for that.
 572                  */
 573                 if (cfg80211_disable_40mhz_24ghz &&
 574                     band == IEEE80211_BAND_2GHZ &&
 575                     sband->ht_cap.ht_supported) {
 576                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 577                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 578                 }
 579
 580                 /*
 581                  * Since we use a u32 for rate bitmaps in
 582                  * ieee80211_get_response_rate, we cannot
 583                  * have more than 32 legacy rates.
 584                  */
 585                 if (WARN_ON(sband->n_bitrates > 32))
 586                         return -EINVAL;
 587
 588                 for (i = 0; i < sband->n_channels; i++) {
 589                         sband->channels[i].orig_flags =
 590                                 sband->channels[i].flags;
 591                         sband->channels[i].orig_mag = INT_MAX;
 592                         sband->channels[i].orig_mpwr =
 593                                 sband->channels[i].max_power;
 594                         sband->channels[i].band = band;
 595                 }
 596
 597                 have_band = true;
 598         }
 599
 600         if (!have_band) {
 601                 WARN_ON(1);
 602                 return -EINVAL;
 603         }
 604
 605 #ifdef CONFIG_PM
 606         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 607                     (!rdev->wiphy.wowlan->pattern_min_len ||
 608                      rdev->wiphy.wowlan->pattern_min_len >
 609                                 rdev->wiphy.wowlan->pattern_max_len)))
 610                 return -EINVAL;
 611 #endif
 612
 613         /* check and set up bitrates */
 614         ieee80211_set_bitrate_flags(wiphy);
 615
 616         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 617
 618         rtnl_lock();
 619         res = device_add(&rdev->wiphy.dev);
 620         if (res) {
 621                 rtnl_unlock();
 622                 return res;
 623         }
 624
 625         /* set up regulatory info */
 626         wiphy_regulatory_register(wiphy);
 627
 628         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 629         cfg80211_rdev_list_generation++;
 630
 631         /* add to debugfs */
 632         rdev->wiphy.debugfsdir =
 633                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 634                                    ieee80211_debugfs_dir);
 635         if (IS_ERR(rdev->wiphy.debugfsdir))
 636                 rdev->wiphy.debugfsdir = NULL;
 637
 638         cfg80211_debugfs_rdev_add(rdev);
 639         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 640
 641         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 642                 struct regulatory_request request;
 643
 644                 request.wiphy_idx = get_wiphy_idx(wiphy);
 645                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 646                 request.alpha2[0] = '9';
 647                 request.alpha2[1] = '9';
 648
 649                 nl80211_send_reg_change_event(&request);
 650         }
 651
 652         rdev->wiphy.registered = true;
 653         rtnl_unlock();
 654
 655         res = rfkill_register(rdev->rfkill);
 656         if (res) {
 657                 rfkill_destroy(rdev->rfkill);
 658                 rdev->rfkill = NULL;
 659                 wiphy_unregister(&rdev->wiphy);
 660                 return res;
 661         }
 662
 663         return 0;
 664 }
 665 EXPORT_SYMBOL(wiphy_register);
 666
 667 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 668 {
 669         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 670
 671         if (!rdev->ops->rfkill_poll)
 672                 return;
 673         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 674         rfkill_resume_polling(rdev->rfkill);
 675 }
 676 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 677
 678 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 679 {
 680         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 681
 682         rfkill_pause_polling(rdev->rfkill);
 683 }
 684 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 685
 686 void wiphy_unregister(struct wiphy *wiphy)
 687 {
 688         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 689
 690         wait_event(rdev->dev_wait, ({
 691                 int __count;
 692                 rtnl_lock();
 693                 __count = rdev->opencount;
 694                 rtnl_unlock();
 695                 __count == 0; }));
 696
 697         if (rdev->rfkill)
 698                 rfkill_unregister(rdev->rfkill);
 699
 700         rtnl_lock();
 701         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 702         rdev->wiphy.registered = false;
 703
 704         WARN_ON(!list_empty(&rdev->wdev_list));
 705
 706         /*
 707          * First remove the hardware from everywhere, this makes
 708          * it impossible to find from userspace.
 709          */
 710         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 711         list_del_rcu(&rdev->list);
 712         synchronize_rcu();
 713
 714         /*
 715          * If this device got a regulatory hint tell core its
 716          * free to listen now to a new shiny device regulatory hint
 717          */
 718         wiphy_regulatory_deregister(wiphy);
 719
 720         cfg80211_rdev_list_generation++;
 721         device_del(&rdev->wiphy.dev);
 722
 723         rtnl_unlock();
 724
 725         flush_work(&rdev->scan_done_wk);
 726         cancel_work_sync(&rdev->conn_work);
 727         flush_work(&rdev->event_work);
 728         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 729         flush_work(&rdev->destroy_work);
 730
 731 #ifdef CONFIG_PM
 732         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
 733                 rdev_set_wakeup(rdev, false);
 734 #endif
 735         cfg80211_rdev_free_wowlan(rdev);
 736         cfg80211_rdev_free_coalesce(rdev);
 737 }
 738 EXPORT_SYMBOL(wiphy_unregister);
 739
 740 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 741 {
 742         struct cfg80211_internal_bss *scan, *tmp;
 743         struct cfg80211_beacon_registration *reg, *treg;
 744         rfkill_destroy(rdev->rfkill);
 745         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 746                 list_del(&reg->list);
 747                 kfree(reg);
 748         }
 749         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 750                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 751         kfree(rdev);
 752 }
 753
 754 void wiphy_free(struct wiphy *wiphy)
 755 {
 756         put_device(&wiphy->dev);
 757 }
 758 EXPORT_SYMBOL(wiphy_free);
 759
 760 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 761 {
 762         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 763
 764         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 765                 schedule_work(&rdev->rfkill_sync);
 766 }
 767 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 768
 769 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 770 {
 771         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 772
 773         ASSERT_RTNL();
 774
 775         if (WARN_ON(wdev->netdev))
 776                 return;
 777
 778         list_del_rcu(&wdev->list);
 779         rdev->devlist_generation++;
 780
 781         switch (wdev->iftype) {
 782         case NL80211_IFTYPE_P2P_DEVICE:
 783                 cfg80211_stop_p2p_device(rdev, wdev);
 784                 break;
 785         default:
 786                 WARN_ON_ONCE(1);
 787                 break;
 788         }
 789 }
 790 EXPORT_SYMBOL(cfg80211_unregister_wdev);
 791
 792 static const struct device_type wiphy_type = {
 793         .name   = "wlan",
 794 };
 795
 796 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 797                                enum nl80211_iftype iftype, int num)
 798 {
 799         ASSERT_RTNL();
 800
 801         rdev->num_running_ifaces += num;
 802         if (iftype == NL80211_IFTYPE_MONITOR)
 803                 rdev->num_running_monitor_ifaces += num;
 804 }
 805
 806 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
 807                       struct wireless_dev *wdev)
 808 {
 809         struct net_device *dev = wdev->netdev;
 810
 811         ASSERT_RTNL();
 812         ASSERT_WDEV_LOCK(wdev);
 813
 814         switch (wdev->iftype) {
 815         case NL80211_IFTYPE_ADHOC:
 816                 __cfg80211_leave_ibss(rdev, dev, true);
 817                 break;
 818         case NL80211_IFTYPE_P2P_CLIENT:
 819         case NL80211_IFTYPE_STATION:
 820                 if (rdev->sched_scan_req && dev == rdev->sched_scan_req->dev)
 821                         __cfg80211_stop_sched_scan(rdev, false);
 822
 823 #ifdef CONFIG_CFG80211_WEXT
 824                 kfree(wdev->wext.ie);
 825                 wdev->wext.ie = NULL;
 826                 wdev->wext.ie_len = 0;
 827                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 828 #endif
 829                 cfg80211_disconnect(rdev, dev,
 830                                     WLAN_REASON_DEAUTH_LEAVING, true);
 831                 break;
 832         case NL80211_IFTYPE_MESH_POINT:
 833                 __cfg80211_leave_mesh(rdev, dev);
 834                 break;
 835         case NL80211_IFTYPE_AP:
 836         case NL80211_IFTYPE_P2P_GO:
 837                 __cfg80211_stop_ap(rdev, dev, true);
 838                 break;
 839         default:
 840                 break;
 841         }
 842 }
 843
 844 void cfg80211_leave(struct cfg80211_registered_device *rdev,
 845                     struct wireless_dev *wdev)
 846 {
 847         wdev_lock(wdev);
 848         __cfg80211_leave(rdev, wdev);
 849         wdev_unlock(wdev);
 850 }
 851
 852 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
 853                          gfp_t gfp)
 854 {
 855         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 856         struct cfg80211_event *ev;
 857         unsigned long flags;
 858
 859         trace_cfg80211_stop_iface(wiphy, wdev);
 860
 861         ev = kzalloc(sizeof(*ev), gfp);
 862         if (!ev)
 863                 return;
 864
 865         ev->type = EVENT_STOPPED;
 866
 867         spin_lock_irqsave(&wdev->event_lock, flags);
 868         list_add_tail(&ev->list, &wdev->event_list);
 869         spin_unlock_irqrestore(&wdev->event_lock, flags);
 870         queue_work(cfg80211_wq, &rdev->event_work);
 871 }
 872 EXPORT_SYMBOL(cfg80211_stop_iface);
 873
 874 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 875                                          unsigned long state, void *ptr)
 876 {
 877         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 878         struct wireless_dev *wdev = dev->ieee80211_ptr;
 879         struct cfg80211_registered_device *rdev;
 880
 881         if (!wdev)
 882                 return NOTIFY_DONE;
 883
 884         rdev = wiphy_to_rdev(wdev->wiphy);
 885
 886         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 887
 888         switch (state) {
 889         case NETDEV_POST_INIT:
 890                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 891                 break;
 892         case NETDEV_REGISTER:
 893                 /*
 894                  * NB: cannot take rdev->mtx here because this may be
 895                  * called within code protected by it when interfaces
 896                  * are added with nl80211.
 897                  */
 898                 mutex_init(&wdev->mtx);
 899                 INIT_LIST_HEAD(&wdev->event_list);
 900                 spin_lock_init(&wdev->event_lock);
 901                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
 902                 spin_lock_init(&wdev->mgmt_registrations_lock);
 903
 904                 wdev->identifier = ++rdev->wdev_id;
 905                 list_add_rcu(&wdev->list, &rdev->wdev_list);
 906                 rdev->devlist_generation++;
 907                 /* can only change netns with wiphy */
 908                 dev->features |= NETIF_F_NETNS_LOCAL;
 909
 910                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 911                                       "phy80211")) {
 912                         pr_err("failed to add phy80211 symlink to netdev!\n");
 913                 }
 914                 wdev->netdev = dev;
 915 #ifdef CONFIG_CFG80211_WEXT
 916                 wdev->wext.default_key = -1;
 917                 wdev->wext.default_mgmt_key = -1;
 918                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 919 #endif
 920
 921                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
 922                         wdev->ps = true;
 923                 else
 924                         wdev->ps = false;
 925                 /* allow mac80211 to determine the timeout */
 926                 wdev->ps_timeout = -1;
 927
 928                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 929                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
 930                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
 931                         dev->priv_flags |= IFF_DONT_BRIDGE;
 932                 break;
 933         case NETDEV_GOING_DOWN:
 934                 cfg80211_leave(rdev, wdev);
 935                 break;
 936         case NETDEV_DOWN:
 937                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
 938                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 939                         if (WARN_ON(!rdev->scan_req->notified))
 940                                 rdev->scan_req->aborted = true;
 941                         ___cfg80211_scan_done(rdev, false);
 942                 }
 943
 944                 if (WARN_ON(rdev->sched_scan_req &&
 945                             rdev->sched_scan_req->dev == wdev->netdev)) {
 946                         __cfg80211_stop_sched_scan(rdev, false);
 947                 }
 948
 949                 rdev->opencount--;
 950                 wake_up(&rdev->dev_wait);
 951                 break;
 952         case NETDEV_UP:
 953                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
 954                 wdev_lock(wdev);
 955                 switch (wdev->iftype) {
 956 #ifdef CONFIG_CFG80211_WEXT
 957                 case NL80211_IFTYPE_ADHOC:
 958                         cfg80211_ibss_wext_join(rdev, wdev);
 959                         break;
 960                 case NL80211_IFTYPE_STATION:
 961                         cfg80211_mgd_wext_connect(rdev, wdev);
 962                         break;
 963 #endif
 964 #ifdef CONFIG_MAC80211_MESH
 965                 case NL80211_IFTYPE_MESH_POINT:
 966                         {
 967                                 /* backward compat code... */
 968                                 struct mesh_setup setup;
 969                                 memcpy(&setup, &default_mesh_setup,
 970                                                 sizeof(setup));
 971                                  /* back compat only needed for mesh_id */
 972                                 setup.mesh_id = wdev->ssid;
 973                                 setup.mesh_id_len = wdev->mesh_id_up_len;
 974                                 if (wdev->mesh_id_up_len)
 975                                         __cfg80211_join_mesh(rdev, dev,
 976                                                         &setup,
 977                                                         &default_mesh_config);
 978                                 break;
 979                         }
 980 #endif
 981                 default:
 982                         break;
 983                 }
 984                 wdev_unlock(wdev);
 985                 rdev->opencount++;
 986
 987                 /*
 988                  * Configure power management to the driver here so that its
 989                  * correctly set also after interface type changes etc.
 990                  */
 991                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 992                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
 993                     rdev->ops->set_power_mgmt)
 994                         if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
 995                                                 wdev->ps_timeout)) {
 996                                 /* assume this means it's off */
 997                                 wdev->ps = false;
 998                         }
 999                 break;
1000         case NETDEV_UNREGISTER:
1001                 /*
1002                  * It is possible to get NETDEV_UNREGISTER
1003                  * multiple times. To detect that, check
1004                  * that the interface is still on the list
1005                  * of registered interfaces, and only then
1006                  * remove and clean it up.
1007                  */
1008                 if (!list_empty(&wdev->list)) {
1009                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1010                         list_del_rcu(&wdev->list);
1011                         rdev->devlist_generation++;
1012                         cfg80211_mlme_purge_registrations(wdev);
1013 #ifdef CONFIG_CFG80211_WEXT
1014                         kfree(wdev->wext.keys);
1015 #endif
1016                 }
1017                 /*
1018                  * synchronise (so that we won't find this netdev
1019                  * from other code any more) and then clear the list
1020                  * head so that the above code can safely check for
1021                  * !list_empty() to avoid double-cleanup.
1022                  */
1023                 synchronize_rcu();
1024                 INIT_LIST_HEAD(&wdev->list);
1025                 /*
1026                  * Ensure that all events have been processed and
1027                  * freed.
1028                  */
1029                 cfg80211_process_wdev_events(wdev);
1030
1031                 if (WARN_ON(wdev->current_bss)) {
1032                         cfg80211_unhold_bss(wdev->current_bss);
1033                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1034                         wdev->current_bss = NULL;
1035                 }
1036                 break;
1037         case NETDEV_PRE_UP:
1038                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1039                         return notifier_from_errno(-EOPNOTSUPP);
1040                 if (rfkill_blocked(rdev->rfkill))
1041                         return notifier_from_errno(-ERFKILL);
1042                 break;
1043         default:
1044                 return NOTIFY_DONE;
1045         }
1046
1047         return NOTIFY_OK;
1048 }
1049
1050 static struct notifier_block cfg80211_netdev_notifier = {
1051         .notifier_call = cfg80211_netdev_notifier_call,
1052 };
1053
1054 static void __net_exit cfg80211_pernet_exit(struct net *net)
1055 {
1056         struct cfg80211_registered_device *rdev;
1057
1058         rtnl_lock();
1059         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1060                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1061                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1062         }
1063         rtnl_unlock();
1064 }
1065
1066 static struct pernet_operations cfg80211_pernet_ops = {
1067         .exit = cfg80211_pernet_exit,
1068 };
1069
1070 static int __init cfg80211_init(void)
1071 {
1072         int err;
1073
1074         err = register_pernet_device(&cfg80211_pernet_ops);
1075         if (err)
1076                 goto out_fail_pernet;
1077
1078         err = wiphy_sysfs_init();
1079         if (err)
1080                 goto out_fail_sysfs;
1081
1082         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1083         if (err)
1084                 goto out_fail_notifier;
1085
1086         err = nl80211_init();
1087         if (err)
1088                 goto out_fail_nl80211;
1089
1090         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1091
1092         err = regulatory_init();
1093         if (err)
1094                 goto out_fail_reg;
1095
1096         cfg80211_wq = create_singlethread_workqueue("cfg80211");
1097         if (!cfg80211_wq) {
1098                 err = -ENOMEM;
1099                 goto out_fail_wq;
1100         }
1101
1102         return 0;
1103
1104 out_fail_wq:
1105         regulatory_exit();
1106 out_fail_reg:
1107         debugfs_remove(ieee80211_debugfs_dir);
1108 out_fail_nl80211:
1109         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1110 out_fail_notifier:
1111         wiphy_sysfs_exit();
1112 out_fail_sysfs:
1113         unregister_pernet_device(&cfg80211_pernet_ops);
1114 out_fail_pernet:
1115         return err;
1116 }
1117 subsys_initcall(cfg80211_init);
1118
1119 static void __exit cfg80211_exit(void)
1120 {
1121         debugfs_remove(ieee80211_debugfs_dir);
1122         nl80211_exit();
1123         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1124         wiphy_sysfs_exit();
1125         regulatory_exit();
1126         unregister_pernet_device(&cfg80211_pernet_ops);
1127         destroy_workqueue(cfg80211_wq);
1128 }
1129 module_exit(cfg80211_exit);