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  * Copyright 2015       Intel Deutschland GmbH
   7  */
   8
   9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  10
  11 #include <linux/if.h>
  12 #include <linux/module.h>
  13 #include <linux/err.h>
  14 #include <linux/list.h>
  15 #include <linux/slab.h>
  16 #include <linux/nl80211.h>
  17 #include <linux/debugfs.h>
  18 #include <linux/notifier.h>
  19 #include <linux/device.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/sched.h>
  23 #include <net/genetlink.h>
  24 #include <net/cfg80211.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         if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
  99                 return -EINVAL;
 100
 101         /* prohibit calling the thing phy%d when %d is not its number */
 102         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 103         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 104                 /* count number of places needed to print wiphy_idx */
 105                 digits = 1;
 106                 while (wiphy_idx /= 10)
 107                         digits++;
 108                 /*
 109                  * deny the name if it is phy<idx> where <idx> is printed
 110                  * without leading zeroes. taken == strlen(newname) here
 111                  */
 112                 if (taken == strlen(PHY_NAME) + digits)
 113                         return -EINVAL;
 114         }
 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, wiphy_name(&rdev2->wiphy)) == 0)
 119                         return -EINVAL;
 120
 121         return 0;
 122 }
 123
 124 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 125                         char *newname)
 126 {
 127         int result;
 128
 129         ASSERT_RTNL();
 130
 131         /* Ignore nop renames */
 132         if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
 133                 return 0;
 134
 135         result = cfg80211_dev_check_name(rdev, newname);
 136         if (result < 0)
 137                 return result;
 138
 139         result = device_rename(&rdev->wiphy.dev, newname);
 140         if (result)
 141                 return result;
 142
 143         if (rdev->wiphy.debugfsdir &&
 144             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 145                             rdev->wiphy.debugfsdir,
 146                             rdev->wiphy.debugfsdir->d_parent,
 147                             newname))
 148                 pr_err("failed to rename debugfs dir to %s!\n", newname);
 149
 150         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 151
 152         return 0;
 153 }
 154
 155 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 156                           struct net *net)
 157 {
 158         struct wireless_dev *wdev;
 159         int err = 0;
 160
 161         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 162                 return -EOPNOTSUPP;
 163
 164         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 165                 if (!wdev->netdev)
 166                         continue;
 167                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 168                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 169                 if (err)
 170                         break;
 171                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 172         }
 173
 174         if (err) {
 175                 /* failed -- clean up to old netns */
 176                 net = wiphy_net(&rdev->wiphy);
 177
 178                 list_for_each_entry_continue_reverse(wdev,
 179                                                      &rdev->wiphy.wdev_list,
 180                                                      list) {
 181                         if (!wdev->netdev)
 182                                 continue;
 183                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 184                         err = dev_change_net_namespace(wdev->netdev, net,
 185                                                         "wlan%d");
 186                         WARN_ON(err);
 187                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 188                 }
 189
 190                 return err;
 191         }
 192
 193         wiphy_net_set(&rdev->wiphy, net);
 194
 195         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 196         WARN_ON(err);
 197
 198         return 0;
 199 }
 200
 201 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 202 {
 203         struct cfg80211_registered_device *rdev = data;
 204
 205         rdev_rfkill_poll(rdev);
 206 }
 207
 208 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 209                               struct wireless_dev *wdev)
 210 {
 211         ASSERT_RTNL();
 212
 213         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 214                 return;
 215
 216         if (!wdev_running(wdev))
 217                 return;
 218
 219         rdev_stop_p2p_device(rdev, wdev);
 220         wdev->is_running = false;
 221
 222         rdev->opencount--;
 223
 224         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 225                 if (WARN_ON(!rdev->scan_req->notified))
 226                         rdev->scan_req->info.aborted = true;
 227                 ___cfg80211_scan_done(rdev, false);
 228         }
 229 }
 230
 231 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
 232                        struct wireless_dev *wdev)
 233 {
 234         ASSERT_RTNL();
 235
 236         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
 237                 return;
 238
 239         if (!wdev_running(wdev))
 240                 return;
 241
 242         rdev_stop_nan(rdev, wdev);
 243         wdev->is_running = false;
 244
 245         rdev->opencount--;
 246 }
 247
 248 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 249 {
 250         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 251         struct wireless_dev *wdev;
 252
 253         ASSERT_RTNL();
 254
 255         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 256                 if (wdev->netdev) {
 257                         dev_close(wdev->netdev);
 258                         continue;
 259                 }
 260                 /* otherwise, check iftype */
 261                 switch (wdev->iftype) {
 262                 case NL80211_IFTYPE_P2P_DEVICE:
 263                         cfg80211_stop_p2p_device(rdev, wdev);
 264                         break;
 265                 case NL80211_IFTYPE_NAN:
 266                         cfg80211_stop_nan(rdev, wdev);
 267                         break;
 268                 default:
 269                         break;
 270                 }
 271         }
 272 }
 273 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 274
 275 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 276 {
 277         struct cfg80211_registered_device *rdev = data;
 278
 279         if (!blocked)
 280                 return 0;
 281
 282         rtnl_lock();
 283         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 284         rtnl_unlock();
 285
 286         return 0;
 287 }
 288
 289 static void cfg80211_rfkill_sync_work(struct work_struct *work)
 290 {
 291         struct cfg80211_registered_device *rdev;
 292
 293         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
 294         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
 295 }
 296
 297 static void cfg80211_event_work(struct work_struct *work)
 298 {
 299         struct cfg80211_registered_device *rdev;
 300
 301         rdev = container_of(work, struct cfg80211_registered_device,
 302                             event_work);
 303
 304         rtnl_lock();
 305         cfg80211_process_rdev_events(rdev);
 306         rtnl_unlock();
 307 }
 308
 309 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 310 {
 311         struct wireless_dev *wdev, *tmp;
 312
 313         ASSERT_RTNL();
 314
 315         list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
 316                 if (wdev->nl_owner_dead)
 317                         rdev_del_virtual_intf(rdev, wdev);
 318         }
 319 }
 320
 321 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 322 {
 323         struct cfg80211_registered_device *rdev;
 324
 325         rdev = container_of(work, struct cfg80211_registered_device,
 326                             destroy_work);
 327
 328         rtnl_lock();
 329         cfg80211_destroy_ifaces(rdev);
 330         rtnl_unlock();
 331 }
 332
 333 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
 334 {
 335         struct cfg80211_registered_device *rdev;
 336         struct cfg80211_sched_scan_request *req, *tmp;
 337
 338         rdev = container_of(work, struct cfg80211_registered_device,
 339                            sched_scan_stop_wk);
 340
 341         rtnl_lock();
 342         list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
 343                 if (req->nl_owner_dead)
 344                         cfg80211_stop_sched_scan_req(rdev, req, false);
 345         }
 346         rtnl_unlock();
 347 }
 348
 349 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
 350 {
 351         struct cfg80211_registered_device *rdev;
 352
 353         rdev = container_of(work, struct cfg80211_registered_device,
 354                             propagate_radar_detect_wk);
 355
 356         rtnl_lock();
 357
 358         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
 359                                        NL80211_DFS_UNAVAILABLE,
 360                                        NL80211_RADAR_DETECTED);
 361
 362         rtnl_unlock();
 363 }
 364
 365 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
 366 {
 367         struct cfg80211_registered_device *rdev;
 368
 369         rdev = container_of(work, struct cfg80211_registered_device,
 370                             propagate_cac_done_wk);
 371
 372         rtnl_lock();
 373
 374         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
 375                                        NL80211_DFS_AVAILABLE,
 376                                        NL80211_RADAR_CAC_FINISHED);
 377
 378         rtnl_unlock();
 379 }
 380
 381 /* exported functions */
 382
 383 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 384                            const char *requested_name)
 385 {
 386         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 387
 388         struct cfg80211_registered_device *rdev;
 389         int alloc_size;
 390
 391         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 392         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 393         WARN_ON(ops->connect && !ops->disconnect);
 394         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 395         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 396         WARN_ON(ops->add_station && !ops->del_station);
 397         WARN_ON(ops->add_mpath && !ops->del_mpath);
 398         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 399         WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
 400         WARN_ON(ops->start_ap && !ops->stop_ap);
 401         WARN_ON(ops->join_ocb && !ops->leave_ocb);
 402         WARN_ON(ops->suspend && !ops->resume);
 403         WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
 404         WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
 405         WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
 406         WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
 407
 408         alloc_size = sizeof(*rdev) + sizeof_priv;
 409
 410         rdev = kzalloc(alloc_size, GFP_KERNEL);
 411         if (!rdev)
 412                 return NULL;
 413
 414         rdev->ops = ops;
 415
 416         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 417
 418         if (unlikely(rdev->wiphy_idx < 0)) {
 419                 /* ugh, wrapped! */
 420                 atomic_dec(&wiphy_counter);
 421                 kfree(rdev);
 422                 return NULL;
 423         }
 424
 425         /* atomic_inc_return makes it start at 1, make it start at 0 */
 426         rdev->wiphy_idx--;
 427
 428         /* give it a proper name */
 429         if (requested_name && requested_name[0]) {
 430                 int rv;
 431
 432                 rtnl_lock();
 433                 rv = cfg80211_dev_check_name(rdev, requested_name);
 434
 435                 if (rv < 0) {
 436                         rtnl_unlock();
 437                         goto use_default_name;
 438                 }
 439
 440                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 441                 rtnl_unlock();
 442                 if (rv)
 443                         goto use_default_name;
 444         } else {
 445                 int rv;
 446
 447 use_default_name:
 448                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 449                  * the restrictions on phy names.  Probably this call could
 450                  * fail if some other part of the kernel (re)named a device
 451                  * phyX.  But, might should add some locking and check return
 452                  * value, and use a different name if this one exists?
 453                  */
 454                 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 455                 if (rv < 0) {
 456                         kfree(rdev);
 457                         return NULL;
 458                 }
 459         }
 460
 461         INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
 462         INIT_LIST_HEAD(&rdev->beacon_registrations);
 463         spin_lock_init(&rdev->beacon_registrations_lock);
 464         spin_lock_init(&rdev->bss_lock);
 465         INIT_LIST_HEAD(&rdev->bss_list);
 466         INIT_LIST_HEAD(&rdev->sched_scan_req_list);
 467         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 468         INIT_LIST_HEAD(&rdev->mlme_unreg);
 469         spin_lock_init(&rdev->mlme_unreg_lock);
 470         INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
 471         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 472                           cfg80211_dfs_channels_update_work);
 473 #ifdef CONFIG_CFG80211_WEXT
 474         rdev->wiphy.wext = &cfg80211_wext_handler;
 475 #endif
 476
 477         device_initialize(&rdev->wiphy.dev);
 478         rdev->wiphy.dev.class = &ieee80211_class;
 479         rdev->wiphy.dev.platform_data = rdev;
 480         device_enable_async_suspend(&rdev->wiphy.dev);
 481
 482         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 483         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 484         INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
 485         INIT_WORK(&rdev->propagate_radar_detect_wk,
 486                   cfg80211_propagate_radar_detect_wk);
 487         INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
 488
 489 #ifdef CONFIG_CFG80211_DEFAULT_PS
 490         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 491 #endif
 492
 493         wiphy_net_set(&rdev->wiphy, &init_net);
 494
 495         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 496         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 497                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 498                                    &rdev->rfkill_ops, rdev);
 499
 500         if (!rdev->rfkill) {
 501                 wiphy_free(&rdev->wiphy);
 502                 return NULL;
 503         }
 504
 505         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
 506         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 507         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 508
 509         init_waitqueue_head(&rdev->dev_wait);
 510
 511         /*
 512          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 513          * Fragmentation and RTS threshold are disabled by default with the
 514          * special -1 value.
 515          */
 516         rdev->wiphy.retry_short = 7;
 517         rdev->wiphy.retry_long = 4;
 518         rdev->wiphy.frag_threshold = (u32) -1;
 519         rdev->wiphy.rts_threshold = (u32) -1;
 520         rdev->wiphy.coverage_class = 0;
 521
 522         rdev->wiphy.max_num_csa_counters = 1;
 523
 524         rdev->wiphy.max_sched_scan_plans = 1;
 525         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 526
 527         return &rdev->wiphy;
 528 }
 529 EXPORT_SYMBOL(wiphy_new_nm);
 530
 531 static int wiphy_verify_combinations(struct wiphy *wiphy)
 532 {
 533         const struct ieee80211_iface_combination *c;
 534         int i, j;
 535
 536         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 537                 u32 cnt = 0;
 538                 u16 all_iftypes = 0;
 539
 540                 c = &wiphy->iface_combinations[i];
 541
 542                 /*
 543                  * Combinations with just one interface aren't real,
 544                  * however we make an exception for DFS.
 545                  */
 546                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 547                         return -EINVAL;
 548
 549                 /* Need at least one channel */
 550                 if (WARN_ON(!c->num_different_channels))
 551                         return -EINVAL;
 552
 553                 /*
 554                  * Put a sane limit on maximum number of different
 555                  * channels to simplify channel accounting code.
 556                  */
 557                 if (WARN_ON(c->num_different_channels >
 558                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 559                         return -EINVAL;
 560
 561                 /* DFS only works on one channel. */
 562                 if (WARN_ON(c->radar_detect_widths &&
 563                             (c->num_different_channels > 1)))
 564                         return -EINVAL;
 565
 566                 if (WARN_ON(!c->n_limits))
 567                         return -EINVAL;
 568
 569                 for (j = 0; j < c->n_limits; j++) {
 570                         u16 types = c->limits[j].types;
 571
 572                         /* interface types shouldn't overlap */
 573                         if (WARN_ON(types & all_iftypes))
 574                                 return -EINVAL;
 575                         all_iftypes |= types;
 576
 577                         if (WARN_ON(!c->limits[j].max))
 578                                 return -EINVAL;
 579
 580                         /* Shouldn't list software iftypes in combinations! */
 581                         if (WARN_ON(wiphy->software_iftypes & types))
 582                                 return -EINVAL;
 583
 584                         /* Only a single P2P_DEVICE can be allowed */
 585                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 586                                     c->limits[j].max > 1))
 587                                 return -EINVAL;
 588
 589                         /* Only a single NAN can be allowed */
 590                         if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
 591                                     c->limits[j].max > 1))
 592                                 return -EINVAL;
 593
 594                         /*
 595                          * This isn't well-defined right now. If you have an
 596                          * IBSS interface, then its beacon interval may change
 597                          * by joining other networks, and nothing prevents it
 598                          * from doing that.
 599                          * So technically we probably shouldn't even allow AP
 600                          * and IBSS in the same interface, but it seems that
 601                          * some drivers support that, possibly only with fixed
 602                          * beacon intervals for IBSS.
 603                          */
 604                         if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
 605                                     c->beacon_int_min_gcd)) {
 606                                 return -EINVAL;
 607                         }
 608
 609                         cnt += c->limits[j].max;
 610                         /*
 611                          * Don't advertise an unsupported type
 612                          * in a combination.
 613                          */
 614                         if (WARN_ON((wiphy->interface_modes & types) != types))
 615                                 return -EINVAL;
 616                 }
 617
 618 #ifndef CONFIG_WIRELESS_WDS
 619                 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
 620                         return -EINVAL;
 621 #endif
 622
 623                 /* You can't even choose that many! */
 624                 if (WARN_ON(cnt < c->max_interfaces))
 625                         return -EINVAL;
 626         }
 627
 628         return 0;
 629 }
 630
 631 int wiphy_register(struct wiphy *wiphy)
 632 {
 633         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 634         int res;
 635         enum nl80211_band band;
 636         struct ieee80211_supported_band *sband;
 637         bool have_band = false;
 638         int i;
 639         u16 ifmodes = wiphy->interface_modes;
 640
 641 #ifdef CONFIG_PM
 642         if (WARN_ON(wiphy->wowlan &&
 643                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 644                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 645                 return -EINVAL;
 646         if (WARN_ON(wiphy->wowlan &&
 647                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 648                     !wiphy->wowlan->tcp))
 649                 return -EINVAL;
 650 #endif
 651         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 652                     (!rdev->ops->tdls_channel_switch ||
 653                      !rdev->ops->tdls_cancel_channel_switch)))
 654                 return -EINVAL;
 655
 656         if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
 657                     (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
 658                      !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
 659                      !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
 660                 return -EINVAL;
 661
 662 #ifndef CONFIG_WIRELESS_WDS
 663         if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
 664                 return -EINVAL;
 665 #endif
 666
 667         /*
 668          * if a wiphy has unsupported modes for regulatory channel enforcement,
 669          * opt-out of enforcement checking
 670          */
 671         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 672                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 673                                        BIT(NL80211_IFTYPE_AP) |
 674                                        BIT(NL80211_IFTYPE_P2P_GO) |
 675                                        BIT(NL80211_IFTYPE_ADHOC) |
 676                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 677                                        BIT(NL80211_IFTYPE_NAN) |
 678                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 679                                        BIT(NL80211_IFTYPE_MONITOR)))
 680                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 681
 682         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 683                     (wiphy->regulatory_flags &
 684                                         (REGULATORY_CUSTOM_REG |
 685                                          REGULATORY_STRICT_REG |
 686                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 687                                          REGULATORY_COUNTRY_IE_IGNORE))))
 688                 return -EINVAL;
 689
 690         if (WARN_ON(wiphy->coalesce &&
 691                     (!wiphy->coalesce->n_rules ||
 692                      !wiphy->coalesce->n_patterns) &&
 693                     (!wiphy->coalesce->pattern_min_len ||
 694                      wiphy->coalesce->pattern_min_len >
 695                         wiphy->coalesce->pattern_max_len)))
 696                 return -EINVAL;
 697
 698         if (WARN_ON(wiphy->ap_sme_capa &&
 699                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 700                 return -EINVAL;
 701
 702         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 703                 return -EINVAL;
 704
 705         if (WARN_ON(wiphy->addresses &&
 706                     !is_zero_ether_addr(wiphy->perm_addr) &&
 707                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 708                            ETH_ALEN)))
 709                 return -EINVAL;
 710
 711         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 712                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 713                      !rdev->ops->set_mac_acl)))
 714                 return -EINVAL;
 715
 716         /* assure only valid behaviours are flagged by driver
 717          * hence subtract 2 as bit 0 is invalid.
 718          */
 719         if (WARN_ON(wiphy->bss_select_support &&
 720                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 721                 return -EINVAL;
 722
 723         if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
 724                                             NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
 725                     (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
 726                 return -EINVAL;
 727
 728         if (wiphy->addresses)
 729                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 730
 731         /* sanity check ifmodes */
 732         WARN_ON(!ifmodes);
 733         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 734         if (WARN_ON(ifmodes != wiphy->interface_modes))
 735                 wiphy->interface_modes = ifmodes;
 736
 737         res = wiphy_verify_combinations(wiphy);
 738         if (res)
 739                 return res;
 740
 741         /* sanity check supported bands/channels */
 742         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 743                 sband = wiphy->bands[band];
 744                 if (!sband)
 745                         continue;
 746
 747                 sband->band = band;
 748                 if (WARN_ON(!sband->n_channels))
 749                         return -EINVAL;
 750                 /*
 751                  * on 60GHz band, there are no legacy rates, so
 752                  * n_bitrates is 0
 753                  */
 754                 if (WARN_ON(band != NL80211_BAND_60GHZ &&
 755                             !sband->n_bitrates))
 756                         return -EINVAL;
 757
 758                 /*
 759                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 760                  * modify the sband's ht data even if the driver uses a
 761                  * global structure for that.
 762                  */
 763                 if (cfg80211_disable_40mhz_24ghz &&
 764                     band == NL80211_BAND_2GHZ &&
 765                     sband->ht_cap.ht_supported) {
 766                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 767                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 768                 }
 769
 770                 /*
 771                  * Since we use a u32 for rate bitmaps in
 772                  * ieee80211_get_response_rate, we cannot
 773                  * have more than 32 legacy rates.
 774                  */
 775                 if (WARN_ON(sband->n_bitrates > 32))
 776                         return -EINVAL;
 777
 778                 for (i = 0; i < sband->n_channels; i++) {
 779                         sband->channels[i].orig_flags =
 780                                 sband->channels[i].flags;
 781                         sband->channels[i].orig_mag = INT_MAX;
 782                         sband->channels[i].orig_mpwr =
 783                                 sband->channels[i].max_power;
 784                         sband->channels[i].band = band;
 785                 }
 786
 787                 have_band = true;
 788         }
 789
 790         if (!have_band) {
 791                 WARN_ON(1);
 792                 return -EINVAL;
 793         }
 794
 795 #ifdef CONFIG_PM
 796         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 797                     (!rdev->wiphy.wowlan->pattern_min_len ||
 798                      rdev->wiphy.wowlan->pattern_min_len >
 799                                 rdev->wiphy.wowlan->pattern_max_len)))
 800                 return -EINVAL;
 801 #endif
 802
 803         /* check and set up bitrates */
 804         ieee80211_set_bitrate_flags(wiphy);
 805
 806         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 807
 808         rtnl_lock();
 809         res = device_add(&rdev->wiphy.dev);
 810         if (res) {
 811                 rtnl_unlock();
 812                 return res;
 813         }
 814
 815         /* set up regulatory info */
 816         wiphy_regulatory_register(wiphy);
 817
 818         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 819         cfg80211_rdev_list_generation++;
 820
 821         /* add to debugfs */
 822         rdev->wiphy.debugfsdir =
 823                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
 824                                    ieee80211_debugfs_dir);
 825         if (IS_ERR(rdev->wiphy.debugfsdir))
 826                 rdev->wiphy.debugfsdir = NULL;
 827
 828         cfg80211_debugfs_rdev_add(rdev);
 829         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 830
 831         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 832                 struct regulatory_request request;
 833
 834                 request.wiphy_idx = get_wiphy_idx(wiphy);
 835                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 836                 request.alpha2[0] = '9';
 837                 request.alpha2[1] = '9';
 838
 839                 nl80211_send_reg_change_event(&request);
 840         }
 841
 842         /* Check that nobody globally advertises any capabilities they do not
 843          * advertise on all possible interface types.
 844          */
 845         if (wiphy->extended_capabilities_len &&
 846             wiphy->num_iftype_ext_capab &&
 847             wiphy->iftype_ext_capab) {
 848                 u8 supported_on_all, j;
 849                 const struct wiphy_iftype_ext_capab *capab;
 850
 851                 capab = wiphy->iftype_ext_capab;
 852                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
 853                         if (capab[0].extended_capabilities_len > j)
 854                                 supported_on_all =
 855                                         capab[0].extended_capabilities[j];
 856                         else
 857                                 supported_on_all = 0x00;
 858                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
 859                                 if (j >= capab[i].extended_capabilities_len) {
 860                                         supported_on_all = 0x00;
 861                                         break;
 862                                 }
 863                                 supported_on_all &=
 864                                         capab[i].extended_capabilities[j];
 865                         }
 866                         if (WARN_ON(wiphy->extended_capabilities[j] &
 867                                     ~supported_on_all))
 868                                 break;
 869                 }
 870         }
 871
 872         rdev->wiphy.registered = true;
 873         rtnl_unlock();
 874
 875         res = rfkill_register(rdev->rfkill);
 876         if (res) {
 877                 rfkill_destroy(rdev->rfkill);
 878                 rdev->rfkill = NULL;
 879                 wiphy_unregister(&rdev->wiphy);
 880                 return res;
 881         }
 882
 883         return 0;
 884 }
 885 EXPORT_SYMBOL(wiphy_register);
 886
 887 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 888 {
 889         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 890
 891         if (!rdev->ops->rfkill_poll)
 892                 return;
 893         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 894         rfkill_resume_polling(rdev->rfkill);
 895 }
 896 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 897
 898 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 899 {
 900         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 901
 902         rfkill_pause_polling(rdev->rfkill);
 903 }
 904 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 905
 906 void wiphy_unregister(struct wiphy *wiphy)
 907 {
 908         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 909
 910         wait_event(rdev->dev_wait, ({
 911                 int __count;
 912                 rtnl_lock();
 913                 __count = rdev->opencount;
 914                 rtnl_unlock();
 915                 __count == 0; }));
 916
 917         if (rdev->rfkill)
 918                 rfkill_unregister(rdev->rfkill);
 919
 920         rtnl_lock();
 921         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 922         rdev->wiphy.registered = false;
 923
 924         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
 925
 926         /*
 927          * First remove the hardware from everywhere, this makes
 928          * it impossible to find from userspace.
 929          */
 930         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 931         list_del_rcu(&rdev->list);
 932         synchronize_rcu();
 933
 934         /*
 935          * If this device got a regulatory hint tell core its
 936          * free to listen now to a new shiny device regulatory hint
 937          */
 938         wiphy_regulatory_deregister(wiphy);
 939
 940         cfg80211_rdev_list_generation++;
 941         device_del(&rdev->wiphy.dev);
 942
 943         rtnl_unlock();
 944
 945         flush_work(&rdev->scan_done_wk);
 946         cancel_work_sync(&rdev->conn_work);
 947         flush_work(&rdev->event_work);
 948         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 949         flush_work(&rdev->destroy_work);
 950         flush_work(&rdev->sched_scan_stop_wk);
 951         flush_work(&rdev->mlme_unreg_wk);
 952         flush_work(&rdev->propagate_radar_detect_wk);
 953         flush_work(&rdev->propagate_cac_done_wk);
 954
 955 #ifdef CONFIG_PM
 956         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
 957                 rdev_set_wakeup(rdev, false);
 958 #endif
 959         cfg80211_rdev_free_wowlan(rdev);
 960         cfg80211_rdev_free_coalesce(rdev);
 961 }
 962 EXPORT_SYMBOL(wiphy_unregister);
 963
 964 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 965 {
 966         struct cfg80211_internal_bss *scan, *tmp;
 967         struct cfg80211_beacon_registration *reg, *treg;
 968         rfkill_destroy(rdev->rfkill);
 969         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
 970                 list_del(&reg->list);
 971                 kfree(reg);
 972         }
 973         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
 974                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 975         kfree(rdev);
 976 }
 977
 978 void wiphy_free(struct wiphy *wiphy)
 979 {
 980         put_device(&wiphy->dev);
 981 }
 982 EXPORT_SYMBOL(wiphy_free);
 983
 984 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
 985 {
 986         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 987
 988         if (rfkill_set_hw_state(rdev->rfkill, blocked))
 989                 schedule_work(&rdev->rfkill_sync);
 990 }
 991 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
 992
 993 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
 994 {
 995         kfree(wdev->cqm_config);
 996         wdev->cqm_config = NULL;
 997 }
 998
 999 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1000 {
1001         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1002
1003         ASSERT_RTNL();
1004
1005         if (WARN_ON(wdev->netdev))
1006                 return;
1007
1008         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1009
1010         list_del_rcu(&wdev->list);
1011         rdev->devlist_generation++;
1012
1013         switch (wdev->iftype) {
1014         case NL80211_IFTYPE_P2P_DEVICE:
1015                 cfg80211_mlme_purge_registrations(wdev);
1016                 cfg80211_stop_p2p_device(rdev, wdev);
1017                 break;
1018         case NL80211_IFTYPE_NAN:
1019                 cfg80211_stop_nan(rdev, wdev);
1020                 break;
1021         default:
1022                 WARN_ON_ONCE(1);
1023                 break;
1024         }
1025
1026         cfg80211_cqm_config_free(wdev);
1027 }
1028 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1029
1030 static const struct device_type wiphy_type = {
1031         .name   = "wlan",
1032 };
1033
1034 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1035                                enum nl80211_iftype iftype, int num)
1036 {
1037         ASSERT_RTNL();
1038
1039         rdev->num_running_ifaces += num;
1040         if (iftype == NL80211_IFTYPE_MONITOR)
1041                 rdev->num_running_monitor_ifaces += num;
1042 }
1043
1044 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1045                       struct wireless_dev *wdev)
1046 {
1047         struct net_device *dev = wdev->netdev;
1048         struct cfg80211_sched_scan_request *pos, *tmp;
1049
1050         ASSERT_RTNL();
1051         ASSERT_WDEV_LOCK(wdev);
1052
1053         switch (wdev->iftype) {
1054         case NL80211_IFTYPE_ADHOC:
1055                 __cfg80211_leave_ibss(rdev, dev, true);
1056                 break;
1057         case NL80211_IFTYPE_P2P_CLIENT:
1058         case NL80211_IFTYPE_STATION:
1059                 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1060                                          list) {
1061                         if (dev == pos->dev)
1062                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1063                 }
1064
1065 #ifdef CONFIG_CFG80211_WEXT
1066                 kfree(wdev->wext.ie);
1067                 wdev->wext.ie = NULL;
1068                 wdev->wext.ie_len = 0;
1069                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1070 #endif
1071                 cfg80211_disconnect(rdev, dev,
1072                                     WLAN_REASON_DEAUTH_LEAVING, true);
1073                 break;
1074         case NL80211_IFTYPE_MESH_POINT:
1075                 __cfg80211_leave_mesh(rdev, dev);
1076                 break;
1077         case NL80211_IFTYPE_AP:
1078         case NL80211_IFTYPE_P2P_GO:
1079                 __cfg80211_stop_ap(rdev, dev, true);
1080                 break;
1081         case NL80211_IFTYPE_OCB:
1082                 __cfg80211_leave_ocb(rdev, dev);
1083                 break;
1084         case NL80211_IFTYPE_WDS:
1085                 /* must be handled by mac80211/driver, has no APIs */
1086                 break;
1087         case NL80211_IFTYPE_P2P_DEVICE:
1088         case NL80211_IFTYPE_NAN:
1089                 /* cannot happen, has no netdev */
1090                 break;
1091         case NL80211_IFTYPE_AP_VLAN:
1092         case NL80211_IFTYPE_MONITOR:
1093                 /* nothing to do */
1094                 break;
1095         case NL80211_IFTYPE_UNSPECIFIED:
1096         case NUM_NL80211_IFTYPES:
1097                 /* invalid */
1098                 break;
1099         }
1100 }
1101
1102 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1103                     struct wireless_dev *wdev)
1104 {
1105         wdev_lock(wdev);
1106         __cfg80211_leave(rdev, wdev);
1107         wdev_unlock(wdev);
1108 }
1109
1110 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1111                          gfp_t gfp)
1112 {
1113         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1114         struct cfg80211_event *ev;
1115         unsigned long flags;
1116
1117         trace_cfg80211_stop_iface(wiphy, wdev);
1118
1119         ev = kzalloc(sizeof(*ev), gfp);
1120         if (!ev)
1121                 return;
1122
1123         ev->type = EVENT_STOPPED;
1124
1125         spin_lock_irqsave(&wdev->event_lock, flags);
1126         list_add_tail(&ev->list, &wdev->event_list);
1127         spin_unlock_irqrestore(&wdev->event_lock, flags);
1128         queue_work(cfg80211_wq, &rdev->event_work);
1129 }
1130 EXPORT_SYMBOL(cfg80211_stop_iface);
1131
1132 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1133                                          unsigned long state, void *ptr)
1134 {
1135         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1136         struct wireless_dev *wdev = dev->ieee80211_ptr;
1137         struct cfg80211_registered_device *rdev;
1138         struct cfg80211_sched_scan_request *pos, *tmp;
1139
1140         if (!wdev)
1141                 return NOTIFY_DONE;
1142
1143         rdev = wiphy_to_rdev(wdev->wiphy);
1144
1145         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1146
1147         switch (state) {
1148         case NETDEV_POST_INIT:
1149                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1150                 break;
1151         case NETDEV_REGISTER:
1152                 /*
1153                  * NB: cannot take rdev->mtx here because this may be
1154                  * called within code protected by it when interfaces
1155                  * are added with nl80211.
1156                  */
1157                 mutex_init(&wdev->mtx);
1158                 INIT_LIST_HEAD(&wdev->event_list);
1159                 spin_lock_init(&wdev->event_lock);
1160                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
1161                 spin_lock_init(&wdev->mgmt_registrations_lock);
1162
1163                 /*
1164                  * We get here also when the interface changes network namespaces,
1165                  * as it's registered into the new one, but we don't want it to
1166                  * change ID in that case. Checking if the ID is already assigned
1167                  * works, because 0 isn't considered a valid ID and the memory is
1168                  * 0-initialized.
1169                  */
1170                 if (!wdev->identifier)
1171                         wdev->identifier = ++rdev->wdev_id;
1172                 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1173                 rdev->devlist_generation++;
1174                 /* can only change netns with wiphy */
1175                 dev->features |= NETIF_F_NETNS_LOCAL;
1176
1177                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1178                                       "phy80211")) {
1179                         pr_err("failed to add phy80211 symlink to netdev!\n");
1180                 }
1181                 wdev->netdev = dev;
1182 #ifdef CONFIG_CFG80211_WEXT
1183                 wdev->wext.default_key = -1;
1184                 wdev->wext.default_mgmt_key = -1;
1185                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1186 #endif
1187
1188                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1189                         wdev->ps = true;
1190                 else
1191                         wdev->ps = false;
1192                 /* allow mac80211 to determine the timeout */
1193                 wdev->ps_timeout = -1;
1194
1195                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1196                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1197                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1198                         dev->priv_flags |= IFF_DONT_BRIDGE;
1199
1200                 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1201
1202                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1203                 break;
1204         case NETDEV_GOING_DOWN:
1205                 cfg80211_leave(rdev, wdev);
1206                 break;
1207         case NETDEV_DOWN:
1208                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1209                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1210                         if (WARN_ON(!rdev->scan_req->notified))
1211                                 rdev->scan_req->info.aborted = true;
1212                         ___cfg80211_scan_done(rdev, false);
1213                 }
1214
1215                 list_for_each_entry_safe(pos, tmp,
1216                                          &rdev->sched_scan_req_list, list) {
1217                         if (WARN_ON(pos && pos->dev == wdev->netdev))
1218                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1219                 }
1220
1221                 rdev->opencount--;
1222                 wake_up(&rdev->dev_wait);
1223                 break;
1224         case NETDEV_UP:
1225                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1226                 wdev_lock(wdev);
1227                 switch (wdev->iftype) {
1228 #ifdef CONFIG_CFG80211_WEXT
1229                 case NL80211_IFTYPE_ADHOC:
1230                         cfg80211_ibss_wext_join(rdev, wdev);
1231                         break;
1232                 case NL80211_IFTYPE_STATION:
1233                         cfg80211_mgd_wext_connect(rdev, wdev);
1234                         break;
1235 #endif
1236 #ifdef CONFIG_MAC80211_MESH
1237                 case NL80211_IFTYPE_MESH_POINT:
1238                         {
1239                                 /* backward compat code... */
1240                                 struct mesh_setup setup;
1241                                 memcpy(&setup, &default_mesh_setup,
1242                                                 sizeof(setup));
1243                                  /* back compat only needed for mesh_id */
1244                                 setup.mesh_id = wdev->ssid;
1245                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1246                                 if (wdev->mesh_id_up_len)
1247                                         __cfg80211_join_mesh(rdev, dev,
1248                                                         &setup,
1249                                                         &default_mesh_config);
1250                                 break;
1251                         }
1252 #endif
1253                 default:
1254                         break;
1255                 }
1256                 wdev_unlock(wdev);
1257                 rdev->opencount++;
1258
1259                 /*
1260                  * Configure power management to the driver here so that its
1261                  * correctly set also after interface type changes etc.
1262                  */
1263                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1264                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1265                     rdev->ops->set_power_mgmt &&
1266                     rdev_set_power_mgmt(rdev, dev, wdev->ps,
1267                                         wdev->ps_timeout)) {
1268                         /* assume this means it's off */
1269                         wdev->ps = false;
1270                 }
1271                 break;
1272         case NETDEV_UNREGISTER:
1273                 /*
1274                  * It is possible to get NETDEV_UNREGISTER
1275                  * multiple times. To detect that, check
1276                  * that the interface is still on the list
1277                  * of registered interfaces, and only then
1278                  * remove and clean it up.
1279                  */
1280                 if (!list_empty(&wdev->list)) {
1281                         nl80211_notify_iface(rdev, wdev,
1282                                              NL80211_CMD_DEL_INTERFACE);
1283                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1284                         list_del_rcu(&wdev->list);
1285                         rdev->devlist_generation++;
1286                         cfg80211_mlme_purge_registrations(wdev);
1287 #ifdef CONFIG_CFG80211_WEXT
1288                         kzfree(wdev->wext.keys);
1289 #endif
1290                         flush_work(&wdev->disconnect_wk);
1291                         cfg80211_cqm_config_free(wdev);
1292                 }
1293                 /*
1294                  * synchronise (so that we won't find this netdev
1295                  * from other code any more) and then clear the list
1296                  * head so that the above code can safely check for
1297                  * !list_empty() to avoid double-cleanup.
1298                  */
1299                 synchronize_rcu();
1300                 INIT_LIST_HEAD(&wdev->list);
1301                 /*
1302                  * Ensure that all events have been processed and
1303                  * freed.
1304                  */
1305                 cfg80211_process_wdev_events(wdev);
1306
1307                 if (WARN_ON(wdev->current_bss)) {
1308                         cfg80211_unhold_bss(wdev->current_bss);
1309                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1310                         wdev->current_bss = NULL;
1311                 }
1312                 break;
1313         case NETDEV_PRE_UP:
1314                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
1315                         return notifier_from_errno(-EOPNOTSUPP);
1316                 if (rfkill_blocked(rdev->rfkill))
1317                         return notifier_from_errno(-ERFKILL);
1318                 break;
1319         default:
1320                 return NOTIFY_DONE;
1321         }
1322
1323         wireless_nlevent_flush();
1324
1325         return NOTIFY_OK;
1326 }
1327
1328 static struct notifier_block cfg80211_netdev_notifier = {
1329         .notifier_call = cfg80211_netdev_notifier_call,
1330 };
1331
1332 static void __net_exit cfg80211_pernet_exit(struct net *net)
1333 {
1334         struct cfg80211_registered_device *rdev;
1335
1336         rtnl_lock();
1337         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1338                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1339                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1340         }
1341         rtnl_unlock();
1342 }
1343
1344 static struct pernet_operations cfg80211_pernet_ops = {
1345         .exit = cfg80211_pernet_exit,
1346 };
1347
1348 static int __init cfg80211_init(void)
1349 {
1350         int err;
1351
1352         err = register_pernet_device(&cfg80211_pernet_ops);
1353         if (err)
1354                 goto out_fail_pernet;
1355
1356         err = wiphy_sysfs_init();
1357         if (err)
1358                 goto out_fail_sysfs;
1359
1360         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1361         if (err)
1362                 goto out_fail_notifier;
1363
1364         err = nl80211_init();
1365         if (err)
1366                 goto out_fail_nl80211;
1367
1368         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1369
1370         err = regulatory_init();
1371         if (err)
1372                 goto out_fail_reg;
1373
1374         cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1375         if (!cfg80211_wq) {
1376                 err = -ENOMEM;
1377                 goto out_fail_wq;
1378         }
1379
1380         return 0;
1381
1382 out_fail_wq:
1383         regulatory_exit();
1384 out_fail_reg:
1385         debugfs_remove(ieee80211_debugfs_dir);
1386         nl80211_exit();
1387 out_fail_nl80211:
1388         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1389 out_fail_notifier:
1390         wiphy_sysfs_exit();
1391 out_fail_sysfs:
1392         unregister_pernet_device(&cfg80211_pernet_ops);
1393 out_fail_pernet:
1394         return err;
1395 }
1396 subsys_initcall(cfg80211_init);
1397
1398 static void __exit cfg80211_exit(void)
1399 {
1400         debugfs_remove(ieee80211_debugfs_dir);
1401         nl80211_exit();
1402         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1403         wiphy_sysfs_exit();
1404         regulatory_exit();
1405         unregister_pernet_device(&cfg80211_pernet_ops);
1406         destroy_workqueue(cfg80211_wq);
1407 }
1408 module_exit(cfg80211_exit);