net/wireless/core.c

   1 /*
   2  * This is the linux wireless configuration interface.
   3  *
   4  * Copyright 2006-2010          Johannes Berg <johannes@sipsolutions.net>
   5  * Copyright 2013-2014  Intel Mobile Communications GmbH
   6  */
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/if.h>
  11 #include <linux/module.h>
  12 #include <linux/err.h>
  13 #include <linux/list.h>
  14 #include <linux/slab.h>
  15 #include <linux/nl80211.h>
  16 #include <linux/debugfs.h>
  17 #include <linux/notifier.h>
  18 #include <linux/device.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/sched.h>
  22 #include <net/genetlink.h>
  23 #include <net/cfg80211.h>
  24 #include "nl80211.h"
  25 #include "core.h"
  26 #include "sysfs.h"
  27 #include "debugfs.h"
  28 #include "wext-compat.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_rdev(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 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
  90                                    const char *newname)
  91 {
  92         struct cfg80211_registered_device *rdev2;
  93         int wiphy_idx, taken = -1, 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         /* Ensure another device does not already have this name. */
 113         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 114                 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
 115                         return -EINVAL;
 116
 117         return 0;
 118 }
 119
 120 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 121                         char *newname)
 122 {
 123         int result;
 124
 125         ASSERT_RTNL();
 126
 127         /* Ignore nop renames */
 128         if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
 129                 return 0;
 130
 131         result = cfg80211_dev_check_name(rdev, newname);
 132         if (result < 0)
 133                 return result;
 134
 135         result = device_rename(&rdev->wiphy.dev, newname);
 136         if (result)
 137                 return result;
 138
 139         if (rdev->wiphy.debugfsdir &&
 140             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 141                             rdev->wiphy.debugfsdir,
 142                             rdev->wiphy.debugfsdir->d_parent,
 143                             newname))
 144                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 145
 146         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 147
 148         return 0;
 149 }
 150
 151 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 152                           struct net *net)
 153 {
 154         struct wireless_dev *wdev;
 155         int err = 0;
 156
 157         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 158                 return -EOPNOTSUPP;
 159
 160         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 161                 if (!wdev->netdev)
 162                         continue;
 163                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 164                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 165                 if (err)
 166                         break;
 167                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 168         }
 169
 170         if (err) {
 171                 /* failed -- clean up to old netns */
 172                 net = wiphy_net(&rdev->wiphy);
 173
 174                 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,
 175                                                      list) {
 176                         if (!wdev->netdev)
 177                                 continue;
 178                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 179                         err = dev_change_net_namespace(wdev->netdev, net,
 180                                                         "wlan%d");
 181                         WARN_ON(err);
 182                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 183                 }
 184
 185                 return err;
 186         }
 187
 188         wiphy_net_set(&rdev->wiphy, net);
 189
 190         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 191         WARN_ON(err);
 192
 193         return 0;
 194 }
 195
 196 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 197 {
 198         struct cfg80211_registered_device *rdev = data;
 199
 200         rdev_rfkill_poll(rdev);
 201 }
 202
 203 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 204                               struct wireless_dev *wdev)
 205 {
 206         ASSERT_RTNL();
 207
 208         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 209                 return;
 210
 211         if (!wdev->p2p_started)
 212                 return;
 213
 214         rdev_stop_p2p_device(rdev, wdev);
 215         wdev->p2p_started = false;
 216
 217         rdev->opencount--;
 218
 219         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 220                 if (WARN_ON(!rdev->scan_req->notified))
 221                         rdev->scan_req->aborted = true;
 222                 ___cfg80211_scan_done(rdev, false);
 223         }
 224 }
 225
 226 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 227 {
 228         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 229         struct wireless_dev *wdev;
 230
 231         ASSERT_RTNL();
 232
 233         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 234                 if (wdev->netdev) {
 235                         dev_close(wdev->netdev);
 236                         continue;
 237                 }
 238                 /* otherwise, check iftype */
 239                 switch (wdev->iftype) {
 240                 case NL80211_IFTYPE_P2P_DEVICE:
 241                         cfg80211_stop_p2p_device(rdev, wdev);
 242                         break;
 243                 default:
 244                         break;
 245                 }
 246         }
 247 }
 248 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 249
 250 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 251 {
 252         struct cfg80211_registered_device *rdev = data;
 253
 254         if (!blocked)
 255                 return 0;
 256
 257         rtnl_lock();
 258         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 259         rtnl_unlock();
 260
 261         return 0;
 262 }
 263
 264 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 265 {
 266         struct cfg80211_registered_device *rdev;
 267
 268         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 269         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 270 }
 271
 272 static void cfg80211_event_work(struct work_struct *work)
 273 {
 274         struct cfg80211_registered_device *rdev;
 275
 276         rdev = container_of(work, struct cfg80211_registered_device,
 277                             event_work);
 278
 279         rtnl_lock();
 280         cfg80211_process_rdev_events(rdev);
 281         rtnl_unlock();
 282 }
 283
 284 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 285 {
 286         struct cfg80211_iface_destroy *item;
 287
 288         ASSERT_RTNL();
 289
 290         spin_lock_irq(&rdev->destroy_list_lock);
 291         while ((item = list_first_entry_or_null(&rdev->destroy_list,
 292                                                 struct cfg80211_iface_destroy,
 293                                                 list))) {
 294                 struct wireless_dev *wdev, *tmp;
 295                 u32 nlportid = item->nlportid;
 296
 297                 list_del(&item->list);
 298                 kfree(item);
 299                 spin_unlock_irq(&rdev->destroy_list_lock);
 300
 301                 list_for_each_entry_safe(wdev, tmp, &rdev->wdev_list, list) {
 302                         if (nlportid == wdev->owner_nlportid)
 303                                 rdev_del_virtual_intf(rdev, wdev);
 304                 }
 305
 306                 spin_lock_irq(&rdev->destroy_list_lock);
 307         }
 308         spin_unlock_irq(&rdev->destroy_list_lock);
 309 }
 310
 311 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 312 {
 313         struct cfg80211_registered_device *rdev;
 314
 315         rdev = container_of(work, struct cfg80211_registered_device,
 316                             destroy_work);
 317
 318         rtnl_lock();
 319         cfg80211_destroy_ifaces(rdev);
 320         rtnl_unlock();
 321 }
 322
 323 /* exported functions */
 324
 325 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 326                            const char *requested_name)
 327 {
 328         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 329
 330         struct cfg80211_registered_device *rdev;
 331         int alloc_size;
 332
 333         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 334         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 335         WARN_ON(ops->connect && !ops->disconnect);
 336         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 337         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 338         WARN_ON(ops->add_station && !ops->del_station);
 339         WARN_ON(ops->add_mpath && !ops->del_mpath);
 340         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 341
 342         alloc_size = sizeof(*rdev) + sizeof_priv;
 343
 344         rdev = kzalloc(alloc_size, GFP_KERNEL);
 345         if (!rdev)
 346                 return NULL;
 347
 348         rdev->ops = ops;
 349
 350         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 351
 352         if (unlikely(rdev->wiphy_idx < 0)) {
 353                 /* ugh, wrapped! */
 354                 atomic_dec(&wiphy_counter);
 355                 kfree(rdev);
 356                 return NULL;
 357         }
 358
 359         /* atomic_inc_return makes it start at 1, make it start at 0 */
 360         rdev->wiphy_idx--;
 361
 362         /* give it a proper name */
 363         if (requested_name && requested_name[0]) {
 364                 int rv;
 365
 366                 rtnl_lock();
 367                 rv = cfg80211_dev_check_name(rdev, requested_name);
 368
 369                 if (rv < 0) {
 370                         rtnl_unlock();
 371                         goto use_default_name;
 372                 }
 373
 374                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 375                 rtnl_unlock();
 376                 if (rv)
 377                         goto use_default_name;
 378         } else {
 379 use_default_name:
 380                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 381                  * the restrictions on phy names.  Probably this call could
 382                  * fail if some other part of the kernel (re)named a device
 383                  * phyX.  But, might should add some locking and check return
 384                  * value, and use a different name if this one exists?
 385                  */
 386                 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 387         }
 388
 389         INIT_LIST_HEAD(&rdev->wdev_list);
 390         INIT_LIST_HEAD(&rdev->beacon_registrations);
 391         spin_lock_init(&rdev->beacon_registrations_lock);
 392         spin_lock_init(&rdev->bss_lock);
 393         INIT_LIST_HEAD(&rdev->bss_list);
 394         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 395         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 396         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 397                           cfg80211_dfs_channels_update_work);
 398 #ifdef CONFIG_CFG80211_WEXT
 399         rdev->wiphy.wext = &cfg80211_wext_handler;
 400 #endif
 401
 402         device_initialize(&rdev->wiphy.dev);
 403         rdev->wiphy.dev.class = &ieee80211_class;
 404         rdev->wiphy.dev.platform_data = rdev;
 405
 406         INIT_LIST_HEAD(&rdev->destroy_list);
 407         spin_lock_init(&rdev->destroy_list_lock);
 408         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 409
 410 #ifdef CONFIG_CFG80211_DEFAULT_PS
 411         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 412 #endif
 413
 414         wiphy_net_set(&rdev->wiphy, &init_net);
 415
 416         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 417         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 418                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 419                                    &rdev->rfkill_ops, rdev);
 420
 421         if (!rdev->rfkill) {
 422                 kfree(rdev);
 423                 return NULL;
 424         }
 425
 426         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 427         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 428         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 429
 430         init_waitqueue_head(&rdev->dev_wait);
 431
 432         /*
 433          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 434          * Fragmentation and RTS threshold are disabled by default with the
 435          * special -1 value.
 436          */
 437         rdev->wiphy.retry_short = 7;
 438         rdev->wiphy.retry_long = 4;
 439         rdev->wiphy.frag_threshold = (u32) -1;
 440         rdev->wiphy.rts_threshold = (u32) -1;
 441         rdev->wiphy.coverage_class = 0;
 442
 443         rdev->wiphy.max_num_csa_counters = 1;
 444
 445         return &rdev->wiphy;
 446 }
 447 EXPORT_SYMBOL(wiphy_new_nm);
 448
 449 static int wiphy_verify_combinations(struct wiphy *wiphy)
 450 {
 451         const struct ieee80211_iface_combination *c;
 452         int i, j;
 453
 454         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 455                 u32 cnt = 0;
 456                 u16 all_iftypes = 0;
 457
 458                 c = &wiphy->iface_combinations[i];
 459
 460                 /*
 461                  * Combinations with just one interface aren't real,
 462                  * however we make an exception for DFS.
 463                  */
 464                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 465                         return -EINVAL;
 466
 467                 /* Need at least one channel */
 468                 if (WARN_ON(!c->num_different_channels))
 469                         return -EINVAL;
 470
 471                 /*
 472                  * Put a sane limit on maximum number of different
 473                  * channels to simplify channel accounting code.
 474                  */
 475                 if (WARN_ON(c->num_different_channels >
 476                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 477                         return -EINVAL;
 478
 479                 /* DFS only works on one channel. */
 480                 if (WARN_ON(c->radar_detect_widths &&
 481                             (c->num_different_channels > 1)))
 482                         return -EINVAL;
 483
 484                 if (WARN_ON(!c->n_limits))
 485                         return -EINVAL;
 486
 487                 for (j = 0; j < c->n_limits; j++) {
 488                         u16 types = c->limits[j].types;
 489
 490                         /* interface types shouldn't overlap */
 491                         if (WARN_ON(types & all_iftypes))
 492                                 return -EINVAL;
 493                         all_iftypes |= types;
 494
 495                         if (WARN_ON(!c->limits[j].max))
 496                                 return -EINVAL;
 497
 498                         /* Shouldn't list software iftypes in combinations! */
 499                         if (WARN_ON(wiphy->software_iftypes & types))
 500                                 return -EINVAL;
 501
 502                         /* Only a single P2P_DEVICE can be allowed */
 503                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 504                                     c->limits[j].max > 1))
 505                                 return -EINVAL;
 506
 507                         cnt += c->limits[j].max;
 508                         /*
 509                          * Don't advertise an unsupported type
 510                          * in a combination.
 511                          */
 512                         if (WARN_ON((wiphy->interface_modes & types) != types))
 513                                 return -EINVAL;
 514                 }
 515
 516                 /* You can't even choose that many! */
 517                 if (WARN_ON(cnt < c->max_interfaces))
 518                         return -EINVAL;
 519         }
 520
 521         return 0;
 522 }
 523
 524 int wiphy_register(struct wiphy *wiphy)
 525 {
 526         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 527         int res;
 528         enum ieee80211_band band;
 529         struct ieee80211_supported_band *sband;
 530         bool have_band = false;
 531         int i;
 532         u16 ifmodes = wiphy->interface_modes;
 533
 534 #ifdef CONFIG_PM
 535         if (WARN_ON(wiphy->wowlan &&
 536                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 537                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 538                 return -EINVAL;
 539         if (WARN_ON(wiphy->wowlan &&
 540                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 541                     !wiphy->wowlan->tcp))
 542                 return -EINVAL;
 543 #endif
 544
 545         if (WARN_ON(wiphy->coalesce &&
 546                     (!wiphy->coalesce->n_rules ||
 547                      !wiphy->coalesce->n_patterns) &&
 548                     (!wiphy->coalesce->pattern_min_len ||
 549                      wiphy->coalesce->pattern_min_len >
 550                         wiphy->coalesce->pattern_max_len)))
 551                 return -EINVAL;
 552
 553         if (WARN_ON(wiphy->ap_sme_capa &&
 554                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 555                 return -EINVAL;
 556
 557         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 558                 return -EINVAL;
 559
 560         if (WARN_ON(wiphy->addresses &&
 561                     !is_zero_ether_addr(wiphy->perm_addr) &&
 562                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 563                            ETH_ALEN)))
 564                 return -EINVAL;
 565
 566         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 567                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 568                      !rdev->ops->set_mac_acl)))
 569                 return -EINVAL;
 570
 571         if (wiphy->addresses)
 572                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 573
 574         /* sanity check ifmodes */
 575         WARN_ON(!ifmodes);
 576         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 577         if (WARN_ON(ifmodes != wiphy->interface_modes))
 578                 wiphy->interface_modes = ifmodes;
 579
 580         res = wiphy_verify_combinations(wiphy);
 581         if (res)
 582                 return res;
 583
 584         /* sanity check supported bands/channels */
 585         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 586                 sband = wiphy->bands[band];
 587                 if (!sband)
 588                         continue;
 589
 590                 sband->band = band;
 591                 if (WARN_ON(!sband->n_channels))
 592                         return -EINVAL;
 593                 /*
 594                  * on 60gHz band, there are no legacy rates, so
 595                  * n_bitrates is 0
 596                  */
 597                 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
 598                             !sband->n_bitrates))
 599                         return -EINVAL;
 600
 601                 /*
 602                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 603                  * modify the sband's ht data even if the driver uses a
 604                  * global structure for that.
 605                  */
 606                 if (cfg80211_disable_40mhz_24ghz &&
 607                     band == IEEE80211_BAND_2GHZ &&
 608                     sband->ht_cap.ht_supported) {
 609                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 610                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 611                 }
 612
 613                 /*
 614                  * Since we use a u32 for rate bitmaps in
 615                  * ieee80211_get_response_rate, we cannot
 616                  * have more than 32 legacy rates.
 617                  */
 618                 if (WARN_ON(sband->n_bitrates > 32))
 619                         return -EINVAL;
 620
 621                 for (i = 0; i < sband->n_channels; i++) {
 622                         sband->channels[i].orig_flags =
 623                                 sband->channels[i].flags;
 624                         sband->channels[i].orig_mag = INT_MAX;
 625                         sband->channels[i].orig_mpwr =
 626                                 sband->channels[i].max_power;
 627                         sband->channels[i].band = band;
 628                 }
 629
 630                 have_band = true;
 631         }
 632
 633         if (!have_band) {
 634                 WARN_ON(1);
 635                 return -EINVAL;
 636         }
 637
 638 #ifdef CONFIG_PM
 639         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 640                     (!rdev->wiphy.wowlan->pattern_min_len ||
 641                      rdev->wiphy.wowlan->pattern_min_len >
 642                                 rdev->wiphy.wowlan->pattern_max_len)))
 643                 return -EINVAL;
 644 #endif
 645
 646         /* check and set up bitrates */
 647         ieee80211_set_bitrate_flags(wiphy);
 648
 649         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 650
 651         rtnl_lock();
 652         res = device_add(&rdev->wiphy.dev);
 653         if (res) {
 654                 rtnl_unlock();
 655                 return res;
 656         }
 657
 658         /* set up regulatory info */
 659         wiphy_regulatory_register(wiphy);
 660
 661         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 662         cfg80211_rdev_list_generation++;
 663
 664         /* add to debugfs */
 665         rdev->wiphy.debugfsdir =
 666                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 667                                    ieee80211_debugfs_dir);
 668         if (IS_ERR(rdev->wiphy.debugfsdir))
 669                 rdev->wiphy.debugfsdir = NULL;
 670
 671         cfg80211_debugfs_rdev_add(rdev);
 672         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 673
 674         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 675                 struct regulatory_request request;
 676
 677                 request.wiphy_idx = get_wiphy_idx(wiphy);
 678                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 679                 request.alpha2[0] = '9';
 680                 request.alpha2[1] = '9';
 681
 682                 nl80211_send_reg_change_event(&request);
 683         }
 684
 685         rdev->wiphy.registered = true;
 686         rtnl_unlock();
 687
 688         res = rfkill_register(rdev->rfkill);
 689         if (res) {
 690                 rfkill_destroy(rdev->rfkill);
 691                 rdev->rfkill = NULL;
 692                 wiphy_unregister(&rdev->wiphy);
 693                 return res;
 694         }
 695
 696         return 0;
 697 }
 698 EXPORT_SYMBOL(wiphy_register);
 699
 700 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 701 {
 702         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 703
 704         if (!rdev->ops->rfkill_poll)
 705                 return;
 706         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 707         rfkill_resume_polling(rdev->rfkill);
 708 }
 709 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 710
 711 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 712 {
 713         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 714
 715         rfkill_pause_polling(rdev->rfkill);
 716 }
 717 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 718
 719 void wiphy_unregister(struct wiphy *wiphy)
 720 {
 721         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 722
 723         wait_event(rdev->dev_wait, ({
 724                 int __count;
 725                 rtnl_lock();
 726                 __count = rdev->opencount;
 727                 rtnl_unlock();
 728                 __count == 0; }));
 729
 730         if (rdev->rfkill)
 731                 rfkill_unregister(rdev->rfkill);
 732
 733         rtnl_lock();
 734         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 735         rdev->wiphy.registered = false;
 736
 737         WARN_ON(!list_empty(&rdev->wdev_list));
 738
 739         /*
 740          * First remove the hardware from everywhere, this makes
 741          * it impossible to find from userspace.
 742          */
 743         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 744         list_del_rcu(&rdev->list);
 745         synchronize_rcu();
 746
 747         /*
 748          * If this device got a regulatory hint tell core its
 749          * free to listen now to a new shiny device regulatory hint
 750          */
 751         wiphy_regulatory_deregister(wiphy);
 752
 753         cfg80211_rdev_list_generation++;
 754         device_del(&rdev->wiphy.dev);
 755
 756         rtnl_unlock();
 757
 758         flush_work(&rdev->scan_done_wk);
 759         cancel_work_sync(&rdev->conn_work);
 760         flush_work(&rdev->event_work);
 761         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 762         flush_work(&rdev->destroy_work);
 763
 764 #ifdef CONFIG_PM
 765         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
 766                 rdev_set_wakeup(rdev, false);
 767 #endif
 768         cfg80211_rdev_free_wowlan(rdev);
 769         cfg80211_rdev_free_coalesce(rdev);
 770 }
 771 EXPORT_SYMBOL(wiphy_unregister);
 772
 773 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 774 {
 775         struct cfg80211_internal_bss *scan, *tmp;
 776         struct cfg80211_beacon_registration *reg, *treg;
 777         rfkill_destroy(rdev->rfkill);
 778         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 779                 list_del(&reg->list);
 780                 kfree(reg);
 781         }
 782         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 783                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 784         kfree(rdev);
 785 }
 786
 787 void wiphy_free(struct wiphy *wiphy)
 788 {
 789         put_device(&wiphy->dev);
 790 }
 791 EXPORT_SYMBOL(wiphy_free);
 792
 793 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 794 {
 795         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 796
 797         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 798                 schedule_work(&rdev->rfkill_sync);
 799 }
 800 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 801
 802 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 803 {
 804         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 805
 806         ASSERT_RTNL();
 807
 808         if (WARN_ON(wdev->netdev))
 809                 return;
 810
 811         list_del_rcu(&wdev->list);
 812         rdev->devlist_generation++;
 813
 814         switch (wdev->iftype) {
 815         case NL80211_IFTYPE_P2P_DEVICE:
 816                 cfg80211_stop_p2p_device(rdev, wdev);
 817                 break;
 818         default:
 819                 WARN_ON_ONCE(1);
 820                 break;
 821         }
 822 }
 823 EXPORT_SYMBOL(cfg80211_unregister_wdev);
 824
 825 static const struct device_type wiphy_type = {
 826         .name   = "wlan",
 827 };
 828
 829 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 830                                enum nl80211_iftype iftype, int num)
 831 {
 832         ASSERT_RTNL();
 833
 834         rdev->num_running_ifaces += num;
 835         if (iftype == NL80211_IFTYPE_MONITOR)
 836                 rdev->num_running_monitor_ifaces += num;
 837 }
 838
 839 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
 840                       struct wireless_dev *wdev)
 841 {
 842         struct net_device *dev = wdev->netdev;
 843
 844         ASSERT_RTNL();
 845         ASSERT_WDEV_LOCK(wdev);
 846
 847         switch (wdev->iftype) {
 848         case NL80211_IFTYPE_ADHOC:
 849                 __cfg80211_leave_ibss(rdev, dev, true);
 850                 break;
 851         case NL80211_IFTYPE_P2P_CLIENT:
 852         case NL80211_IFTYPE_STATION:
 853                 if (rdev->sched_scan_req && dev == rdev->sched_scan_req->dev)
 854                         __cfg80211_stop_sched_scan(rdev, false);
 855
 856 #ifdef CONFIG_CFG80211_WEXT
 857                 kfree(wdev->wext.ie);
 858                 wdev->wext.ie = NULL;
 859                 wdev->wext.ie_len = 0;
 860                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 861 #endif
 862                 cfg80211_disconnect(rdev, dev,
 863                                     WLAN_REASON_DEAUTH_LEAVING, true);
 864                 break;
 865         case NL80211_IFTYPE_MESH_POINT:
 866                 __cfg80211_leave_mesh(rdev, dev);
 867                 break;
 868         case NL80211_IFTYPE_AP:
 869         case NL80211_IFTYPE_P2P_GO:
 870                 __cfg80211_stop_ap(rdev, dev, true);
 871                 break;
 872         default:
 873                 break;
 874         }
 875 }
 876
 877 void cfg80211_leave(struct cfg80211_registered_device *rdev,
 878                     struct wireless_dev *wdev)
 879 {
 880         wdev_lock(wdev);
 881         __cfg80211_leave(rdev, wdev);
 882         wdev_unlock(wdev);
 883 }
 884
 885 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
 886                          gfp_t gfp)
 887 {
 888         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 889         struct cfg80211_event *ev;
 890         unsigned long flags;
 891
 892         trace_cfg80211_stop_iface(wiphy, wdev);
 893
 894         ev = kzalloc(sizeof(*ev), gfp);
 895         if (!ev)
 896                 return;
 897
 898         ev->type = EVENT_STOPPED;
 899
 900         spin_lock_irqsave(&wdev->event_lock, flags);
 901         list_add_tail(&ev->list, &wdev->event_list);
 902         spin_unlock_irqrestore(&wdev->event_lock, flags);
 903         queue_work(cfg80211_wq, &rdev->event_work);
 904 }
 905 EXPORT_SYMBOL(cfg80211_stop_iface);
 906
 907 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 908                                          unsigned long state, void *ptr)
 909 {
 910         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 911         struct wireless_dev *wdev = dev->ieee80211_ptr;
 912         struct cfg80211_registered_device *rdev;
 913
 914         if (!wdev)
 915                 return NOTIFY_DONE;
 916
 917         rdev = wiphy_to_rdev(wdev->wiphy);
 918
 919         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 920
 921         switch (state) {
 922         case NETDEV_POST_INIT:
 923                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 924                 break;
 925         case NETDEV_REGISTER:
 926                 /*
 927                  * NB: cannot take rdev->mtx here because this may be
 928                  * called within code protected by it when interfaces
 929                  * are added with nl80211.
 930                  */
 931                 mutex_init(&wdev->mtx);
 932                 INIT_LIST_HEAD(&wdev->event_list);
 933                 spin_lock_init(&wdev->event_lock);
 934                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
 935                 spin_lock_init(&wdev->mgmt_registrations_lock);
 936
 937                 wdev->identifier = ++rdev->wdev_id;
 938                 list_add_rcu(&wdev->list, &rdev->wdev_list);
 939                 rdev->devlist_generation++;
 940                 /* can only change netns with wiphy */
 941                 dev->features |= NETIF_F_NETNS_LOCAL;
 942
 943                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
 944                                       "phy80211")) {
 945                         pr_err("failed to add phy80211 symlink to netdev!\n");
 946                 }
 947                 wdev->netdev = dev;
 948 #ifdef CONFIG_CFG80211_WEXT
 949                 wdev->wext.default_key = -1;
 950                 wdev->wext.default_mgmt_key = -1;
 951                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 952 #endif
 953
 954                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
 955                         wdev->ps = true;
 956                 else
 957                         wdev->ps = false;
 958                 /* allow mac80211 to determine the timeout */
 959                 wdev->ps_timeout = -1;
 960
 961                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
 962                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
 963                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
 964                         dev->priv_flags |= IFF_DONT_BRIDGE;
 965                 break;
 966         case NETDEV_GOING_DOWN:
 967                 cfg80211_leave(rdev, wdev);
 968                 break;
 969         case NETDEV_DOWN:
 970                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
 971                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 972                         if (WARN_ON(!rdev->scan_req->notified))
 973                                 rdev->scan_req->aborted = true;
 974                         ___cfg80211_scan_done(rdev, false);
 975                 }
 976
 977                 if (WARN_ON(rdev->sched_scan_req &&
 978                             rdev->sched_scan_req->dev == wdev->netdev)) {
 979                         __cfg80211_stop_sched_scan(rdev, false);
 980                 }
 981
 982                 rdev->opencount--;
 983                 wake_up(&rdev->dev_wait);
 984                 break;
 985         case NETDEV_UP:
 986                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
 987                 wdev_lock(wdev);
 988                 switch (wdev->iftype) {
 989 #ifdef CONFIG_CFG80211_WEXT
 990                 case NL80211_IFTYPE_ADHOC:
 991                         cfg80211_ibss_wext_join(rdev, wdev);
 992                         break;
 993                 case NL80211_IFTYPE_STATION:
 994                         cfg80211_mgd_wext_connect(rdev, wdev);
 995                         break;
 996 #endif
 997 #ifdef CONFIG_MAC80211_MESH
 998                 case NL80211_IFTYPE_MESH_POINT:
 999                         {
1000                                 /* backward compat code... */
1001                                 struct mesh_setup setup;
1002                                 memcpy(&setup, &default_mesh_setup,
1003                                                 sizeof(setup));
1004                                  /* back compat only needed for mesh_id */
1005                                 setup.mesh_id = wdev->ssid;
1006                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1007                                 if (wdev->mesh_id_up_len)
1008                                         __cfg80211_join_mesh(rdev, dev,
1009                                                         &setup,
1010                                                         &default_mesh_config);
1011                                 break;
1012                         }
1013 #endif
1014                 default:
1015                         break;
1016                 }
1017                 wdev_unlock(wdev);
1018                 rdev->opencount++;
1019
1020                 /*
1021                  * Configure power management to the driver here so that its
1022                  * correctly set also after interface type changes etc.
1023                  */
1024                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1025                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1026                     rdev->ops->set_power_mgmt)
1027                         if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
1028                                                 wdev->ps_timeout)) {
1029                                 /* assume this means it's off */
1030                                 wdev->ps = false;
1031                         }
1032                 break;
1033         case NETDEV_UNREGISTER:
1034                 /*
1035                  * It is possible to get NETDEV_UNREGISTER
1036                  * multiple times. To detect that, check
1037                  * that the interface is still on the list
1038                  * of registered interfaces, and only then
1039                  * remove and clean it up.
1040                  */
1041                 if (!list_empty(&wdev->list)) {
1042                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1043                         list_del_rcu(&wdev->list);
1044                         rdev->devlist_generation++;
1045                         cfg80211_mlme_purge_registrations(wdev);
1046 #ifdef CONFIG_CFG80211_WEXT
1047                         kzfree(wdev->wext.keys);
1048 #endif
1049                 }
1050                 /*
1051                  * synchronise (so that we won't find this netdev
1052                  * from other code any more) and then clear the list
1053                  * head so that the above code can safely check for
1054                  * !list_empty() to avoid double-cleanup.
1055                  */
1056                 synchronize_rcu();
1057                 INIT_LIST_HEAD(&wdev->list);
1058                 /*
1059                  * Ensure that all events have been processed and
1060                  * freed.
1061                  */
1062                 cfg80211_process_wdev_events(wdev);
1063
1064                 if (WARN_ON(wdev->current_bss)) {
1065                         cfg80211_unhold_bss(wdev->current_bss);
1066                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1067                         wdev->current_bss = NULL;
1068                 }
1069                 break;
1070         case NETDEV_PRE_UP:
1071                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1072                         return notifier_from_errno(-EOPNOTSUPP);
1073                 if (rfkill_blocked(rdev->rfkill))
1074                         return notifier_from_errno(-ERFKILL);
1075                 break;
1076         default:
1077                 return NOTIFY_DONE;
1078         }
1079
1080         return NOTIFY_OK;
1081 }
1082
1083 static struct notifier_block cfg80211_netdev_notifier = {
1084         .notifier_call = cfg80211_netdev_notifier_call,
1085 };
1086
1087 static void __net_exit cfg80211_pernet_exit(struct net *net)
1088 {
1089         struct cfg80211_registered_device *rdev;
1090
1091         rtnl_lock();
1092         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1093                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1094                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1095         }
1096         rtnl_unlock();
1097 }
1098
1099 static struct pernet_operations cfg80211_pernet_ops = {
1100         .exit = cfg80211_pernet_exit,
1101 };
1102
1103 static int __init cfg80211_init(void)
1104 {
1105         int err;
1106
1107         err = register_pernet_device(&cfg80211_pernet_ops);
1108         if (err)
1109                 goto out_fail_pernet;
1110
1111         err = wiphy_sysfs_init();
1112         if (err)
1113                 goto out_fail_sysfs;
1114
1115         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1116         if (err)
1117                 goto out_fail_notifier;
1118
1119         err = nl80211_init();
1120         if (err)
1121                 goto out_fail_nl80211;
1122
1123         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1124
1125         err = regulatory_init();
1126         if (err)
1127                 goto out_fail_reg;
1128
1129         cfg80211_wq = create_singlethread_workqueue("cfg80211");
1130         if (!cfg80211_wq) {
1131                 err = -ENOMEM;
1132                 goto out_fail_wq;
1133         }
1134
1135         return 0;
1136
1137 out_fail_wq:
1138         regulatory_exit();
1139 out_fail_reg:
1140         debugfs_remove(ieee80211_debugfs_dir);
1141 out_fail_nl80211:
1142         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1143 out_fail_notifier:
1144         wiphy_sysfs_exit();
1145 out_fail_sysfs:
1146         unregister_pernet_device(&cfg80211_pernet_ops);
1147 out_fail_pernet:
1148         return err;
1149 }
1150 subsys_initcall(cfg80211_init);
1151
1152 static void __exit cfg80211_exit(void)
1153 {
1154         debugfs_remove(ieee80211_debugfs_dir);
1155         nl80211_exit();
1156         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1157         wiphy_sysfs_exit();
1158         regulatory_exit();
1159         unregister_pernet_device(&cfg80211_pernet_ops);
1160         destroy_workqueue(cfg80211_wq);
1161 }
1162 module_exit(cfg80211_exit);