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 <net/rtnetlink.h>
  25 #include "nl80211.h"
  26 #include "core.h"
  27 #include "sysfs.h"
  28 #include "debugfs.h"
  29 #include "wext-compat.h"
  30 #include "rdev-ops.h"
  31
  32 /* name for sysfs, %d is appended */
  33 #define PHY_NAME "phy"
  34
  35 MODULE_AUTHOR("Johannes Berg");
  36 MODULE_LICENSE("GPL");
  37 MODULE_DESCRIPTION("wireless configuration support");
  38 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
  39
  40 /* RCU-protected (and RTNL for writers) */
  41 LIST_HEAD(cfg80211_rdev_list);
  42 int cfg80211_rdev_list_generation;
  43
  44 /* for debugfs */
  45 static struct dentry *ieee80211_debugfs_dir;
  46
  47 /* for the cleanup, scan and event works */
  48 struct workqueue_struct *cfg80211_wq;
  49
  50 static bool cfg80211_disable_40mhz_24ghz;
  51 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  52 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  53                  "Disable 40MHz support in the 2.4GHz band");
  54
  55 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  56 {
  57         struct cfg80211_registered_device *result = NULL, *rdev;
  58
  59         ASSERT_RTNL();
  60
  61         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  62                 if (rdev->wiphy_idx == wiphy_idx) {
  63                         result = rdev;
  64                         break;
  65                 }
  66         }
  67
  68         return result;
  69 }
  70
  71 int get_wiphy_idx(struct wiphy *wiphy)
  72 {
  73         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
  74
  75         return rdev->wiphy_idx;
  76 }
  77
  78 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  79 {
  80         struct cfg80211_registered_device *rdev;
  81
  82         ASSERT_RTNL();
  83
  84         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  85         if (!rdev)
  86                 return NULL;
  87         return &rdev->wiphy;
  88 }
  89
  90 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
  91                                    const char *newname)
  92 {
  93         struct cfg80211_registered_device *rdev2;
  94         int wiphy_idx, taken = -1, digits;
  95
  96         ASSERT_RTNL();
  97
  98         /* prohibit calling the thing phy%d when %d is not its number */
  99         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 100         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 101                 /* count number of places needed to print wiphy_idx */
 102                 digits = 1;
 103                 while (wiphy_idx /= 10)
 104                         digits++;
 105                 /*
 106                  * deny the name if it is phy<idx> where <idx> is printed
 107                  * without leading zeroes. taken == strlen(newname) here
 108                  */
 109                 if (taken == strlen(PHY_NAME) + digits)
 110                         return -EINVAL;
 111         }
 112
 113         /* Ensure another device does not already have this name. */
 114         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 115                 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
 116                         return -EINVAL;
 117
 118         return 0;
 119 }
 120
 121 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 122                         char *newname)
 123 {
 124         int result;
 125
 126         ASSERT_RTNL();
 127
 128         /* Ignore nop renames */
 129         if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
 130                 return 0;
 131
 132         result = cfg80211_dev_check_name(rdev, newname);
 133         if (result < 0)
 134                 return result;
 135
 136         result = device_rename(&rdev->wiphy.dev, newname);
 137         if (result)
 138                 return result;
 139
 140         if (rdev->wiphy.debugfsdir &&
 141             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 142                             rdev->wiphy.debugfsdir,
 143                             rdev->wiphy.debugfsdir->d_parent,
 144                             newname))
 145                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 146
 147         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 148
 149         return 0;
 150 }
 151
 152 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 153                           struct net *net)
 154 {
 155         struct wireless_dev *wdev;
 156         int err = 0;
 157
 158         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 159                 return -EOPNOTSUPP;
 160
 161         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 162                 if (!wdev->netdev)
 163                         continue;
 164                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 165                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 166                 if (err)
 167                         break;
 168                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 169         }
 170
 171         if (err) {
 172                 /* failed -- clean up to old netns */
 173                 net = wiphy_net(&rdev->wiphy);
 174
 175                 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,
 176                                                      list) {
 177                         if (!wdev->netdev)
 178                                 continue;
 179                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 180                         err = dev_change_net_namespace(wdev->netdev, net,
 181                                                         "wlan%d");
 182                         WARN_ON(err);
 183                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 184                 }
 185
 186                 return err;
 187         }
 188
 189         wiphy_net_set(&rdev->wiphy, net);
 190
 191         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 192         WARN_ON(err);
 193
 194         return 0;
 195 }
 196
 197 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 198 {
 199         struct cfg80211_registered_device *rdev = data;
 200
 201         rdev_rfkill_poll(rdev);
 202 }
 203
 204 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 205                               struct wireless_dev *wdev)
 206 {
 207         ASSERT_RTNL();
 208
 209         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 210                 return;
 211
 212         if (!wdev->p2p_started)
 213                 return;
 214
 215         rdev_stop_p2p_device(rdev, wdev);
 216         wdev->p2p_started = false;
 217
 218         rdev->opencount--;
 219
 220         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 221                 if (WARN_ON(!rdev->scan_req->notified))
 222                         rdev->scan_req->aborted = true;
 223                 ___cfg80211_scan_done(rdev, false);
 224         }
 225 }
 226
 227 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 228 {
 229         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 230         struct wireless_dev *wdev;
 231
 232         ASSERT_RTNL();
 233
 234         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 235                 if (wdev->netdev) {
 236                         dev_close(wdev->netdev);
 237                         continue;
 238                 }
 239                 /* otherwise, check iftype */
 240                 switch (wdev->iftype) {
 241                 case NL80211_IFTYPE_P2P_DEVICE:
 242                         cfg80211_stop_p2p_device(rdev, wdev);
 243                         break;
 244                 default:
 245                         break;
 246                 }
 247         }
 248 }
 249 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 250
 251 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 252 {
 253         struct cfg80211_registered_device *rdev = data;
 254
 255         if (!blocked)
 256                 return 0;
 257
 258         rtnl_lock();
 259         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 260         rtnl_unlock();
 261
 262         return 0;
 263 }
 264
 265 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 266 {
 267         struct cfg80211_registered_device *rdev;
 268
 269         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 270         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 271 }
 272
 273 static void cfg80211_event_work(struct work_struct *work)
 274 {
 275         struct cfg80211_registered_device *rdev;
 276
 277         rdev = container_of(work, struct cfg80211_registered_device,
 278                             event_work);
 279
 280         rtnl_lock();
 281         cfg80211_process_rdev_events(rdev);
 282         rtnl_unlock();
 283 }
 284
 285 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 286 {
 287         struct cfg80211_iface_destroy *item;
 288
 289         ASSERT_RTNL();
 290
 291         spin_lock_irq(&rdev->destroy_list_lock);
 292         while ((item = list_first_entry_or_null(&rdev->destroy_list,
 293                                                 struct cfg80211_iface_destroy,
 294                                                 list))) {
 295                 struct wireless_dev *wdev, *tmp;
 296                 u32 nlportid = item->nlportid;
 297
 298                 list_del(&item->list);
 299                 kfree(item);
 300                 spin_unlock_irq(&rdev->destroy_list_lock);
 301
 302                 list_for_each_entry_safe(wdev, tmp, &rdev->wdev_list, list) {
 303                         if (nlportid == wdev->owner_nlportid)
 304                                 rdev_del_virtual_intf(rdev, wdev);
 305                 }
 306
 307                 spin_lock_irq(&rdev->destroy_list_lock);
 308         }
 309         spin_unlock_irq(&rdev->destroy_list_lock);
 310 }
 311
 312 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 313 {
 314         struct cfg80211_registered_device *rdev;
 315
 316         rdev = container_of(work, struct cfg80211_registered_device,
 317                             destroy_work);
 318
 319         rtnl_lock();
 320         cfg80211_destroy_ifaces(rdev);
 321         rtnl_unlock();
 322 }
 323
 324 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
 325 {
 326         struct cfg80211_registered_device *rdev;
 327
 328         rdev = container_of(work, struct cfg80211_registered_device,
 329                            sched_scan_stop_wk);
 330
 331         rtnl_lock();
 332
 333         __cfg80211_stop_sched_scan(rdev, false);
 334
 335         rtnl_unlock();
 336 }
 337
 338 /* exported functions */
 339
 340 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 341                            const char *requested_name)
 342 {
 343         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 344
 345         struct cfg80211_registered_device *rdev;
 346         int alloc_size;
 347
 348         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 349         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 350         WARN_ON(ops->connect && !ops->disconnect);
 351         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 352         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 353         WARN_ON(ops->add_station && !ops->del_station);
 354         WARN_ON(ops->add_mpath && !ops->del_mpath);
 355         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 356
 357         alloc_size = sizeof(*rdev) + sizeof_priv;
 358
 359         rdev = kzalloc(alloc_size, GFP_KERNEL);
 360         if (!rdev)
 361                 return NULL;
 362
 363         rdev->ops = ops;
 364
 365         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 366
 367         if (unlikely(rdev->wiphy_idx < 0)) {
 368                 /* ugh, wrapped! */
 369                 atomic_dec(&wiphy_counter);
 370                 kfree(rdev);
 371                 return NULL;
 372         }
 373
 374         /* atomic_inc_return makes it start at 1, make it start at 0 */
 375         rdev->wiphy_idx--;
 376
 377         /* give it a proper name */
 378         if (requested_name && requested_name[0]) {
 379                 int rv;
 380
 381                 rtnl_lock();
 382                 rv = cfg80211_dev_check_name(rdev, requested_name);
 383
 384                 if (rv < 0) {
 385                         rtnl_unlock();
 386                         goto use_default_name;
 387                 }
 388
 389                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 390                 rtnl_unlock();
 391                 if (rv)
 392                         goto use_default_name;
 393         } else {
 394 use_default_name:
 395                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 396                  * the restrictions on phy names.  Probably this call could
 397                  * fail if some other part of the kernel (re)named a device
 398                  * phyX.  But, might should add some locking and check return
 399                  * value, and use a different name if this one exists?
 400                  */
 401                 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 402         }
 403
 404         INIT_LIST_HEAD(&rdev->wdev_list);
 405         INIT_LIST_HEAD(&rdev->beacon_registrations);
 406         spin_lock_init(&rdev->beacon_registrations_lock);
 407         spin_lock_init(&rdev->bss_lock);
 408         INIT_LIST_HEAD(&rdev->bss_list);
 409         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 410         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
 411         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 412                           cfg80211_dfs_channels_update_work);
 413 #ifdef CONFIG_CFG80211_WEXT
 414         rdev->wiphy.wext = &cfg80211_wext_handler;
 415 #endif
 416
 417         device_initialize(&rdev->wiphy.dev);
 418         rdev->wiphy.dev.class = &ieee80211_class;
 419         rdev->wiphy.dev.platform_data = rdev;
 420
 421         INIT_LIST_HEAD(&rdev->destroy_list);
 422         spin_lock_init(&rdev->destroy_list_lock);
 423         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 424         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 425
 426 #ifdef CONFIG_CFG80211_DEFAULT_PS
 427         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 428 #endif
 429
 430         wiphy_net_set(&rdev->wiphy, &init_net);
 431
 432         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 433         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 434                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 435                                    &rdev->rfkill_ops, rdev);
 436
 437         if (!rdev->rfkill) {
 438                 kfree(rdev);
 439                 return NULL;
 440         }
 441
 442         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 443         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 444         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 445
 446         init_waitqueue_head(&rdev->dev_wait);
 447
 448         /*
 449          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 450          * Fragmentation and RTS threshold are disabled by default with the
 451          * special -1 value.
 452          */
 453         rdev->wiphy.retry_short = 7;
 454         rdev->wiphy.retry_long = 4;
 455         rdev->wiphy.frag_threshold = (u32) -1;
 456         rdev->wiphy.rts_threshold = (u32) -1;
 457         rdev->wiphy.coverage_class = 0;
 458
 459         rdev->wiphy.max_num_csa_counters = 1;
 460
 461         return &rdev->wiphy;
 462 }
 463 EXPORT_SYMBOL(wiphy_new_nm);
 464
 465 static int wiphy_verify_combinations(struct wiphy *wiphy)
 466 {
 467         const struct ieee80211_iface_combination *c;
 468         int i, j;
 469
 470         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 471                 u32 cnt = 0;
 472                 u16 all_iftypes = 0;
 473
 474                 c = &wiphy->iface_combinations[i];
 475
 476                 /*
 477                  * Combinations with just one interface aren't real,
 478                  * however we make an exception for DFS.
 479                  */
 480                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 481                         return -EINVAL;
 482
 483                 /* Need at least one channel */
 484                 if (WARN_ON(!c->num_different_channels))
 485                         return -EINVAL;
 486
 487                 /*
 488                  * Put a sane limit on maximum number of different
 489                  * channels to simplify channel accounting code.
 490                  */
 491                 if (WARN_ON(c->num_different_channels >
 492                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 493                         return -EINVAL;
 494
 495                 /* DFS only works on one channel. */
 496                 if (WARN_ON(c->radar_detect_widths &&
 497                             (c->num_different_channels > 1)))
 498                         return -EINVAL;
 499
 500                 if (WARN_ON(!c->n_limits))
 501                         return -EINVAL;
 502
 503                 for (j = 0; j < c->n_limits; j++) {
 504                         u16 types = c->limits[j].types;
 505
 506                         /* interface types shouldn't overlap */
 507                         if (WARN_ON(types & all_iftypes))
 508                                 return -EINVAL;
 509                         all_iftypes |= types;
 510
 511                         if (WARN_ON(!c->limits[j].max))
 512                                 return -EINVAL;
 513
 514                         /* Shouldn't list software iftypes in combinations! */
 515                         if (WARN_ON(wiphy->software_iftypes & types))
 516                                 return -EINVAL;
 517
 518                         /* Only a single P2P_DEVICE can be allowed */
 519                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 520                                     c->limits[j].max > 1))
 521                                 return -EINVAL;
 522
 523                         cnt += c->limits[j].max;
 524                         /*
 525                          * Don't advertise an unsupported type
 526                          * in a combination.
 527                          */
 528                         if (WARN_ON((wiphy->interface_modes & types) != types))
 529                                 return -EINVAL;
 530                 }
 531
 532                 /* You can't even choose that many! */
 533                 if (WARN_ON(cnt < c->max_interfaces))
 534                         return -EINVAL;
 535         }
 536
 537         return 0;
 538 }
 539
 540 int wiphy_register(struct wiphy *wiphy)
 541 {
 542         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 543         int res;
 544         enum ieee80211_band band;
 545         struct ieee80211_supported_band *sband;
 546         bool have_band = false;
 547         int i;
 548         u16 ifmodes = wiphy->interface_modes;
 549
 550 #ifdef CONFIG_PM
 551         if (WARN_ON(wiphy->wowlan &&
 552                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 553                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 554                 return -EINVAL;
 555         if (WARN_ON(wiphy->wowlan &&
 556                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 557                     !wiphy->wowlan->tcp))
 558                 return -EINVAL;
 559 #endif
 560         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 561                     (!rdev->ops->tdls_channel_switch ||
 562                      !rdev->ops->tdls_cancel_channel_switch)))
 563                 return -EINVAL;
 564
 565         /*
 566          * if a wiphy has unsupported modes for regulatory channel enforcement,
 567          * opt-out of enforcement checking
 568          */
 569         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 570                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 571                                        BIT(NL80211_IFTYPE_AP) |
 572                                        BIT(NL80211_IFTYPE_P2P_GO) |
 573                                        BIT(NL80211_IFTYPE_ADHOC) |
 574                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 575                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 576                                        BIT(NL80211_IFTYPE_MONITOR)))
 577                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 578
 579         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 580                     (wiphy->regulatory_flags &
 581                                         (REGULATORY_CUSTOM_REG |
 582                                          REGULATORY_STRICT_REG |
 583                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 584                                          REGULATORY_COUNTRY_IE_IGNORE))))
 585                 return -EINVAL;
 586
 587         if (WARN_ON(wiphy->coalesce &&
 588                     (!wiphy->coalesce->n_rules ||
 589                      !wiphy->coalesce->n_patterns) &&
 590                     (!wiphy->coalesce->pattern_min_len ||
 591                      wiphy->coalesce->pattern_min_len >
 592                         wiphy->coalesce->pattern_max_len)))
 593                 return -EINVAL;
 594
 595         if (WARN_ON(wiphy->ap_sme_capa &&
 596                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 597                 return -EINVAL;
 598
 599         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 600                 return -EINVAL;
 601
 602         if (WARN_ON(wiphy->addresses &&
 603                     !is_zero_ether_addr(wiphy->perm_addr) &&
 604                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 605                            ETH_ALEN)))
 606                 return -EINVAL;
 607
 608         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 609                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 610                      !rdev->ops->set_mac_acl)))
 611                 return -EINVAL;
 612
 613         if (wiphy->addresses)
 614                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 615
 616         /* sanity check ifmodes */
 617         WARN_ON(!ifmodes);
 618         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 619         if (WARN_ON(ifmodes != wiphy->interface_modes))
 620                 wiphy->interface_modes = ifmodes;
 621
 622         res = wiphy_verify_combinations(wiphy);
 623         if (res)
 624                 return res;
 625
 626         /* sanity check supported bands/channels */
 627         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 628                 sband = wiphy->bands[band];
 629                 if (!sband)
 630                         continue;
 631
 632                 sband->band = band;
 633                 if (WARN_ON(!sband->n_channels))
 634                         return -EINVAL;
 635                 /*
 636                  * on 60gHz band, there are no legacy rates, so
 637                  * n_bitrates is 0
 638                  */
 639                 if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
 640                             !sband->n_bitrates))
 641                         return -EINVAL;
 642
 643                 /*
 644                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 645                  * modify the sband's ht data even if the driver uses a
 646                  * global structure for that.
 647                  */
 648                 if (cfg80211_disable_40mhz_24ghz &&
 649                     band == IEEE80211_BAND_2GHZ &&
 650                     sband->ht_cap.ht_supported) {
 651                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 652                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 653                 }
 654
 655                 /*
 656                  * Since we use a u32 for rate bitmaps in
 657                  * ieee80211_get_response_rate, we cannot
 658                  * have more than 32 legacy rates.
 659                  */
 660                 if (WARN_ON(sband->n_bitrates > 32))
 661                         return -EINVAL;
 662
 663                 for (i = 0; i < sband->n_channels; i++) {
 664                         sband->channels[i].orig_flags =
 665                                 sband->channels[i].flags;
 666                         sband->channels[i].orig_mag = INT_MAX;
 667                         sband->channels[i].orig_mpwr =
 668                                 sband->channels[i].max_power;
 669                         sband->channels[i].band = band;
 670                 }
 671
 672                 have_band = true;
 673         }
 674
 675         if (!have_band) {
 676                 WARN_ON(1);
 677                 return -EINVAL;
 678         }
 679
 680 #ifdef CONFIG_PM
 681         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 682                     (!rdev->wiphy.wowlan->pattern_min_len ||
 683                      rdev->wiphy.wowlan->pattern_min_len >
 684                                 rdev->wiphy.wowlan->pattern_max_len)))
 685                 return -EINVAL;
 686 #endif
 687
 688         /* check and set up bitrates */
 689         ieee80211_set_bitrate_flags(wiphy);
 690
 691         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 692
 693         rtnl_lock();
 694         res = device_add(&rdev->wiphy.dev);
 695         if (res) {
 696                 rtnl_unlock();
 697                 return res;
 698         }
 699
 700         /* set up regulatory info */
 701         wiphy_regulatory_register(wiphy);
 702
 703         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 704         cfg80211_rdev_list_generation++;
 705
 706         /* add to debugfs */
 707         rdev->wiphy.debugfsdir =
 708                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 709                                    ieee80211_debugfs_dir);
 710         if (IS_ERR(rdev->wiphy.debugfsdir))
 711                 rdev->wiphy.debugfsdir = NULL;
 712
 713         cfg80211_debugfs_rdev_add(rdev);
 714         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 715
 716         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 717                 struct regulatory_request request;
 718
 719                 request.wiphy_idx = get_wiphy_idx(wiphy);
 720                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 721                 request.alpha2[0] = '9';
 722                 request.alpha2[1] = '9';
 723
 724                 nl80211_send_reg_change_event(&request);
 725         }
 726
 727         rdev->wiphy.registered = true;
 728         rtnl_unlock();
 729
 730         res = rfkill_register(rdev->rfkill);
 731         if (res) {
 732                 rfkill_destroy(rdev->rfkill);
 733                 rdev->rfkill = NULL;
 734                 wiphy_unregister(&rdev->wiphy);
 735                 return res;
 736         }
 737
 738         return 0;
 739 }
 740 EXPORT_SYMBOL(wiphy_register);
 741
 742 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 743 {
 744         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 745
 746         if (!rdev->ops->rfkill_poll)
 747                 return;
 748         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 749         rfkill_resume_polling(rdev->rfkill);
 750 }
 751 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 752
 753 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 754 {
 755         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 756
 757         rfkill_pause_polling(rdev->rfkill);
 758 }
 759 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 760
 761 void wiphy_unregister(struct wiphy *wiphy)
 762 {
 763         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 764
 765         wait_event(rdev->dev_wait, ({
 766                 int __count;
 767                 rtnl_lock();
 768                 __count = rdev->opencount;
 769                 rtnl_unlock();
 770                 __count == 0; }));
 771
 772         if (rdev->rfkill)
 773                 rfkill_unregister(rdev->rfkill);
 774
 775         rtnl_lock();
 776         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 777         rdev->wiphy.registered = false;
 778
 779         WARN_ON(!list_empty(&rdev->wdev_list));
 780
 781         /*
 782          * First remove the hardware from everywhere, this makes
 783          * it impossible to find from userspace.
 784          */
 785         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 786         list_del_rcu(&rdev->list);
 787         synchronize_rcu();
 788
 789         /*
 790          * If this device got a regulatory hint tell core its
 791          * free to listen now to a new shiny device regulatory hint
 792          */
 793         wiphy_regulatory_deregister(wiphy);
 794
 795         cfg80211_rdev_list_generation++;
 796         device_del(&rdev->wiphy.dev);
 797
 798         rtnl_unlock();
 799
 800         flush_work(&rdev->scan_done_wk);
 801         cancel_work_sync(&rdev->conn_work);
 802         flush_work(&rdev->event_work);
 803         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 804         flush_work(&rdev->destroy_work);
 805         flush_work(&rdev->sched_scan_stop_wk);
 806
 807 #ifdef CONFIG_PM
 808         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
 809                 rdev_set_wakeup(rdev, false);
 810 #endif
 811         cfg80211_rdev_free_wowlan(rdev);
 812         cfg80211_rdev_free_coalesce(rdev);
 813 }
 814 EXPORT_SYMBOL(wiphy_unregister);
 815
 816 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 817 {
 818         struct cfg80211_internal_bss *scan, *tmp;
 819         struct cfg80211_beacon_registration *reg, *treg;
 820         rfkill_destroy(rdev->rfkill);
 821         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 822                 list_del(&reg->list);
 823                 kfree(reg);
 824         }
 825         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 826                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 827         kfree(rdev);
 828 }
 829
 830 void wiphy_free(struct wiphy *wiphy)
 831 {
 832         put_device(&wiphy->dev);
 833 }
 834 EXPORT_SYMBOL(wiphy_free);
 835
 836 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 837 {
 838         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 839
 840         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 841                 schedule_work(&rdev->rfkill_sync);
 842 }
 843 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 844
 845 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 846 {
 847         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 848
 849         ASSERT_RTNL();
 850
 851         if (WARN_ON(wdev->netdev))
 852                 return;
 853
 854         list_del_rcu(&wdev->list);
 855         rdev->devlist_generation++;
 856
 857         switch (wdev->iftype) {
 858         case NL80211_IFTYPE_P2P_DEVICE:
 859                 cfg80211_stop_p2p_device(rdev, wdev);
 860                 break;
 861         default:
 862                 WARN_ON_ONCE(1);
 863                 break;
 864         }
 865 }
 866 EXPORT_SYMBOL(cfg80211_unregister_wdev);
 867
 868 static const struct device_type wiphy_type = {
 869         .name   = "wlan",
 870 };
 871
 872 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 873                                enum nl80211_iftype iftype, int num)
 874 {
 875         ASSERT_RTNL();
 876
 877         rdev->num_running_ifaces += num;
 878         if (iftype == NL80211_IFTYPE_MONITOR)
 879                 rdev->num_running_monitor_ifaces += num;
 880 }
 881
 882 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
 883                       struct wireless_dev *wdev)
 884 {
 885         struct net_device *dev = wdev->netdev;
 886         struct cfg80211_sched_scan_request *sched_scan_req;
 887
 888         ASSERT_RTNL();
 889         ASSERT_WDEV_LOCK(wdev);
 890
 891         switch (wdev->iftype) {
 892         case NL80211_IFTYPE_ADHOC:
 893                 __cfg80211_leave_ibss(rdev, dev, true);
 894                 break;
 895         case NL80211_IFTYPE_P2P_CLIENT:
 896         case NL80211_IFTYPE_STATION:
 897                 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
 898                 if (sched_scan_req && dev == sched_scan_req->dev)
 899                         __cfg80211_stop_sched_scan(rdev, false);
 900
 901 #ifdef CONFIG_CFG80211_WEXT
 902                 kfree(wdev->wext.ie);
 903                 wdev->wext.ie = NULL;
 904                 wdev->wext.ie_len = 0;
 905                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 906 #endif
 907                 cfg80211_disconnect(rdev, dev,
 908                                     WLAN_REASON_DEAUTH_LEAVING, true);
 909                 break;
 910         case NL80211_IFTYPE_MESH_POINT:
 911                 __cfg80211_leave_mesh(rdev, dev);
 912                 break;
 913         case NL80211_IFTYPE_AP:
 914         case NL80211_IFTYPE_P2P_GO:
 915                 __cfg80211_stop_ap(rdev, dev, true);
 916                 break;
 917         case NL80211_IFTYPE_OCB:
 918                 __cfg80211_leave_ocb(rdev, dev);
 919                 break;
 920         case NL80211_IFTYPE_WDS:
 921                 /* must be handled by mac80211/driver, has no APIs */
 922                 break;
 923         case NL80211_IFTYPE_P2P_DEVICE:
 924                 /* cannot happen, has no netdev */
 925                 break;
 926         case NL80211_IFTYPE_AP_VLAN:
 927         case NL80211_IFTYPE_MONITOR:
 928                 /* nothing to do */
 929                 break;
 930         case NL80211_IFTYPE_UNSPECIFIED:
 931         case NUM_NL80211_IFTYPES:
 932                 /* invalid */
 933                 break;
 934         }
 935 }
 936
 937 void cfg80211_leave(struct cfg80211_registered_device *rdev,
 938                     struct wireless_dev *wdev)
 939 {
 940         wdev_lock(wdev);
 941         __cfg80211_leave(rdev, wdev);
 942         wdev_unlock(wdev);
 943 }
 944
 945 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
 946                          gfp_t gfp)
 947 {
 948         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 949         struct cfg80211_event *ev;
 950         unsigned long flags;
 951
 952         trace_cfg80211_stop_iface(wiphy, wdev);
 953
 954         ev = kzalloc(sizeof(*ev), gfp);
 955         if (!ev)
 956                 return;
 957
 958         ev->type = EVENT_STOPPED;
 959
 960         spin_lock_irqsave(&wdev->event_lock, flags);
 961         list_add_tail(&ev->list, &wdev->event_list);
 962         spin_unlock_irqrestore(&wdev->event_lock, flags);
 963         queue_work(cfg80211_wq, &rdev->event_work);
 964 }
 965 EXPORT_SYMBOL(cfg80211_stop_iface);
 966
 967 static const struct rtnl_link_ops wireless_link_ops = {
 968         .kind = "wlan",
 969 };
 970
 971 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 972                                          unsigned long state, void *ptr)
 973 {
 974         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 975         struct wireless_dev *wdev = dev->ieee80211_ptr;
 976         struct cfg80211_registered_device *rdev;
 977         struct cfg80211_sched_scan_request *sched_scan_req;
 978
 979         if (!wdev)
 980                 return NOTIFY_DONE;
 981
 982         rdev = wiphy_to_rdev(wdev->wiphy);
 983
 984         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
 985
 986         switch (state) {
 987         case NETDEV_POST_INIT:
 988                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
 989                 dev->rtnl_link_ops = &wireless_link_ops;
 990                 break;
 991         case NETDEV_REGISTER:
 992                 /*
 993                  * NB: cannot take rdev->mtx here because this may be
 994                  * called within code protected by it when interfaces
 995                  * are added with nl80211.
 996                  */
 997                 mutex_init(&wdev->mtx);
 998                 INIT_LIST_HEAD(&wdev->event_list);
 999                 spin_lock_init(&wdev->event_lock);
1000                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1001                 spin_lock_init(&wdev->mgmt_registrations_lock);
1002
1003                 wdev->identifier = ++rdev->wdev_id;
1004                 list_add_rcu(&wdev->list, &rdev->wdev_list);
1005                 rdev->devlist_generation++;
1006                 /* can only change netns with wiphy */
1007                 dev->features |= NETIF_F_NETNS_LOCAL;
1008
1009                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1010                                       "phy80211")) {
1011                         pr_err("failed to add phy80211 symlink to netdev!\n");
1012                 }
1013                 wdev->netdev = dev;
1014 #ifdef CONFIG_CFG80211_WEXT
1015                 wdev->wext.default_key = -1;
1016                 wdev->wext.default_mgmt_key = -1;
1017                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1018 #endif
1019
1020                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1021                         wdev->ps = true;
1022                 else
1023                         wdev->ps = false;
1024                 /* allow mac80211 to determine the timeout */
1025                 wdev->ps_timeout = -1;
1026
1027                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1028                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1029                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1030                         dev->priv_flags |= IFF_DONT_BRIDGE;
1031                 break;
1032         case NETDEV_GOING_DOWN:
1033                 cfg80211_leave(rdev, wdev);
1034                 break;
1035         case NETDEV_DOWN:
1036                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1037                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1038                         if (WARN_ON(!rdev->scan_req->notified))
1039                                 rdev->scan_req->aborted = true;
1040                         ___cfg80211_scan_done(rdev, false);
1041                 }
1042
1043                 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
1044                 if (WARN_ON(sched_scan_req &&
1045                             sched_scan_req->dev == wdev->netdev)) {
1046                         __cfg80211_stop_sched_scan(rdev, false);
1047                 }
1048
1049                 rdev->opencount--;
1050                 wake_up(&rdev->dev_wait);
1051                 break;
1052         case NETDEV_UP:
1053                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1054                 wdev_lock(wdev);
1055                 switch (wdev->iftype) {
1056 #ifdef CONFIG_CFG80211_WEXT
1057                 case NL80211_IFTYPE_ADHOC:
1058                         cfg80211_ibss_wext_join(rdev, wdev);
1059                         break;
1060                 case NL80211_IFTYPE_STATION:
1061                         cfg80211_mgd_wext_connect(rdev, wdev);
1062                         break;
1063 #endif
1064 #ifdef CONFIG_MAC80211_MESH
1065                 case NL80211_IFTYPE_MESH_POINT:
1066                         {
1067                                 /* backward compat code... */
1068                                 struct mesh_setup setup;
1069                                 memcpy(&setup, &default_mesh_setup,
1070                                                 sizeof(setup));
1071                                  /* back compat only needed for mesh_id */
1072                                 setup.mesh_id = wdev->ssid;
1073                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1074                                 if (wdev->mesh_id_up_len)
1075                                         __cfg80211_join_mesh(rdev, dev,
1076                                                         &setup,
1077                                                         &default_mesh_config);
1078                                 break;
1079                         }
1080 #endif
1081                 default:
1082                         break;
1083                 }
1084                 wdev_unlock(wdev);
1085                 rdev->opencount++;
1086
1087                 /*
1088                  * Configure power management to the driver here so that its
1089                  * correctly set also after interface type changes etc.
1090                  */
1091                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1092                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1093                     rdev->ops->set_power_mgmt)
1094                         if (rdev_set_power_mgmt(rdev, dev, wdev->ps,
1095                                                 wdev->ps_timeout)) {
1096                                 /* assume this means it's off */
1097                                 wdev->ps = false;
1098                         }
1099                 break;
1100         case NETDEV_UNREGISTER:
1101                 /*
1102                  * It is possible to get NETDEV_UNREGISTER
1103                  * multiple times. To detect that, check
1104                  * that the interface is still on the list
1105                  * of registered interfaces, and only then
1106                  * remove and clean it up.
1107                  */
1108                 if (!list_empty(&wdev->list)) {
1109                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1110                         list_del_rcu(&wdev->list);
1111                         rdev->devlist_generation++;
1112                         cfg80211_mlme_purge_registrations(wdev);
1113 #ifdef CONFIG_CFG80211_WEXT
1114                         kzfree(wdev->wext.keys);
1115 #endif
1116                 }
1117                 /*
1118                  * synchronise (so that we won't find this netdev
1119                  * from other code any more) and then clear the list
1120                  * head so that the above code can safely check for
1121                  * !list_empty() to avoid double-cleanup.
1122                  */
1123                 synchronize_rcu();
1124                 INIT_LIST_HEAD(&wdev->list);
1125                 /*
1126                  * Ensure that all events have been processed and
1127                  * freed.
1128                  */
1129                 cfg80211_process_wdev_events(wdev);
1130
1131                 if (WARN_ON(wdev->current_bss)) {
1132                         cfg80211_unhold_bss(wdev->current_bss);
1133                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1134                         wdev->current_bss = NULL;
1135                 }
1136                 break;
1137         case NETDEV_PRE_UP:
1138                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1139                         return notifier_from_errno(-EOPNOTSUPP);
1140                 if (rfkill_blocked(rdev->rfkill))
1141                         return notifier_from_errno(-ERFKILL);
1142                 break;
1143         default:
1144                 return NOTIFY_DONE;
1145         }
1146
1147         return NOTIFY_OK;
1148 }
1149
1150 static struct notifier_block cfg80211_netdev_notifier = {
1151         .notifier_call = cfg80211_netdev_notifier_call,
1152 };
1153
1154 static void __net_exit cfg80211_pernet_exit(struct net *net)
1155 {
1156         struct cfg80211_registered_device *rdev;
1157
1158         rtnl_lock();
1159         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1160                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1161                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1162         }
1163         rtnl_unlock();
1164 }
1165
1166 static struct pernet_operations cfg80211_pernet_ops = {
1167         .exit = cfg80211_pernet_exit,
1168 };
1169
1170 static int __init cfg80211_init(void)
1171 {
1172         int err;
1173
1174         err = register_pernet_device(&cfg80211_pernet_ops);
1175         if (err)
1176                 goto out_fail_pernet;
1177
1178         err = wiphy_sysfs_init();
1179         if (err)
1180                 goto out_fail_sysfs;
1181
1182         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1183         if (err)
1184                 goto out_fail_notifier;
1185
1186         err = nl80211_init();
1187         if (err)
1188                 goto out_fail_nl80211;
1189
1190         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1191
1192         err = regulatory_init();
1193         if (err)
1194                 goto out_fail_reg;
1195
1196         cfg80211_wq = create_singlethread_workqueue("cfg80211");
1197         if (!cfg80211_wq) {
1198                 err = -ENOMEM;
1199                 goto out_fail_wq;
1200         }
1201
1202         return 0;
1203
1204 out_fail_wq:
1205         regulatory_exit();
1206 out_fail_reg:
1207         debugfs_remove(ieee80211_debugfs_dir);
1208 out_fail_nl80211:
1209         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1210 out_fail_notifier:
1211         wiphy_sysfs_exit();
1212 out_fail_sysfs:
1213         unregister_pernet_device(&cfg80211_pernet_ops);
1214 out_fail_pernet:
1215         return err;
1216 }
1217 subsys_initcall(cfg80211_init);
1218
1219 static void __exit cfg80211_exit(void)
1220 {
1221         debugfs_remove(ieee80211_debugfs_dir);
1222         nl80211_exit();
1223         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1224         wiphy_sysfs_exit();
1225         regulatory_exit();
1226         unregister_pernet_device(&cfg80211_pernet_ops);
1227         destroy_workqueue(cfg80211_wq);
1228 }
1229 module_exit(cfg80211_exit);