net/wireless/core.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * This is the linux wireless configuration interface.
   4  *
   5  * Copyright 2006-2010          Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  * Copyright 2015-2017  Intel Deutschland GmbH
   8  * Copyright (C) 2018-2020 Intel Corporation
   9  */
  10
  11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  12
  13 #include <linux/if.h>
  14 #include <linux/module.h>
  15 #include <linux/err.h>
  16 #include <linux/list.h>
  17 #include <linux/slab.h>
  18 #include <linux/nl80211.h>
  19 #include <linux/debugfs.h>
  20 #include <linux/notifier.h>
  21 #include <linux/device.h>
  22 #include <linux/etherdevice.h>
  23 #include <linux/rtnetlink.h>
  24 #include <linux/sched.h>
  25 #include <net/genetlink.h>
  26 #include <net/cfg80211.h>
  27 #include "nl80211.h"
  28 #include "core.h"
  29 #include "sysfs.h"
  30 #include "debugfs.h"
  31 #include "wext-compat.h"
  32 #include "rdev-ops.h"
  33
  34 /* name for sysfs, %d is appended */
  35 #define PHY_NAME "phy"
  36
  37 MODULE_AUTHOR("Johannes Berg");
  38 MODULE_LICENSE("GPL");
  39 MODULE_DESCRIPTION("wireless configuration support");
  40 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
  41
  42 /* RCU-protected (and RTNL for writers) */
  43 LIST_HEAD(cfg80211_rdev_list);
  44 int cfg80211_rdev_list_generation;
  45
  46 /* for debugfs */
  47 static struct dentry *ieee80211_debugfs_dir;
  48
  49 /* for the cleanup, scan and event works */
  50 struct workqueue_struct *cfg80211_wq;
  51
  52 static bool cfg80211_disable_40mhz_24ghz;
  53 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  54 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  55                  "Disable 40MHz support in the 2.4GHz band");
  56
  57 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  58 {
  59         struct cfg80211_registered_device *result = NULL, *rdev;
  60
  61         ASSERT_RTNL();
  62
  63         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  64                 if (rdev->wiphy_idx == wiphy_idx) {
  65                         result = rdev;
  66                         break;
  67                 }
  68         }
  69
  70         return result;
  71 }
  72
  73 int get_wiphy_idx(struct wiphy *wiphy)
  74 {
  75         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
  76
  77         return rdev->wiphy_idx;
  78 }
  79
  80 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  81 {
  82         struct cfg80211_registered_device *rdev;
  83
  84         ASSERT_RTNL();
  85
  86         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  87         if (!rdev)
  88                 return NULL;
  89         return &rdev->wiphy;
  90 }
  91
  92 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
  93                                    const char *newname)
  94 {
  95         struct cfg80211_registered_device *rdev2;
  96         int wiphy_idx, taken = -1, digits;
  97
  98         ASSERT_RTNL();
  99
 100         if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
 101                 return -EINVAL;
 102
 103         /* prohibit calling the thing phy%d when %d is not its number */
 104         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 105         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 106                 /* count number of places needed to print wiphy_idx */
 107                 digits = 1;
 108                 while (wiphy_idx /= 10)
 109                         digits++;
 110                 /*
 111                  * deny the name if it is phy<idx> where <idx> is printed
 112                  * without leading zeroes. taken == strlen(newname) here
 113                  */
 114                 if (taken == strlen(PHY_NAME) + digits)
 115                         return -EINVAL;
 116         }
 117
 118         /* Ensure another device does not already have this name. */
 119         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
 120                 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
 121                         return -EINVAL;
 122
 123         return 0;
 124 }
 125
 126 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 127                         char *newname)
 128 {
 129         int result;
 130
 131         ASSERT_RTNL();
 132
 133         /* Ignore nop renames */
 134         if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
 135                 return 0;
 136
 137         result = cfg80211_dev_check_name(rdev, newname);
 138         if (result < 0)
 139                 return result;
 140
 141         result = device_rename(&rdev->wiphy.dev, newname);
 142         if (result)
 143                 return result;
 144
 145         if (!IS_ERR_OR_NULL(rdev->wiphy.debugfsdir))
 146                 debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 147                                rdev->wiphy.debugfsdir,
 148                                rdev->wiphy.debugfsdir->d_parent, 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         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 194                 if (!wdev->netdev)
 195                         continue;
 196                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
 197         }
 198         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 199
 200         wiphy_net_set(&rdev->wiphy, net);
 201
 202         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 203         WARN_ON(err);
 204
 205         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 206         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 207                 if (!wdev->netdev)
 208                         continue;
 209                 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
 210         }
 211
 212         return 0;
 213 }
 214
 215 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 216 {
 217         struct cfg80211_registered_device *rdev = data;
 218
 219         rdev_rfkill_poll(rdev);
 220 }
 221
 222 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 223                               struct wireless_dev *wdev)
 224 {
 225         ASSERT_RTNL();
 226
 227         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 228                 return;
 229
 230         if (!wdev_running(wdev))
 231                 return;
 232
 233         rdev_stop_p2p_device(rdev, wdev);
 234         wdev->is_running = false;
 235
 236         rdev->opencount--;
 237
 238         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 239                 if (WARN_ON(!rdev->scan_req->notified))
 240                         rdev->scan_req->info.aborted = true;
 241                 ___cfg80211_scan_done(rdev, false);
 242         }
 243 }
 244
 245 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
 246                        struct wireless_dev *wdev)
 247 {
 248         ASSERT_RTNL();
 249
 250         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
 251                 return;
 252
 253         if (!wdev_running(wdev))
 254                 return;
 255
 256         rdev_stop_nan(rdev, wdev);
 257         wdev->is_running = false;
 258
 259         rdev->opencount--;
 260 }
 261
 262 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 263 {
 264         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 265         struct wireless_dev *wdev;
 266
 267         ASSERT_RTNL();
 268
 269         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 270                 if (wdev->netdev) {
 271                         dev_close(wdev->netdev);
 272                         continue;
 273                 }
 274                 /* otherwise, check iftype */
 275                 switch (wdev->iftype) {
 276                 case NL80211_IFTYPE_P2P_DEVICE:
 277                         cfg80211_stop_p2p_device(rdev, wdev);
 278                         break;
 279                 case NL80211_IFTYPE_NAN:
 280                         cfg80211_stop_nan(rdev, wdev);
 281                         break;
 282                 default:
 283                         break;
 284                 }
 285         }
 286 }
 287 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 288
 289 static int cfg80211_rfkill_set_block(void *data, bool blocked)
 290 {
 291         struct cfg80211_registered_device *rdev = data;
 292
 293         if (!blocked)
 294                 return 0;
 295
 296         rtnl_lock();
 297         cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 298         rtnl_unlock();
 299
 300         return 0;
 301 }
 302
 303 static void cfg80211_rfkill_block_work(struct work_struct *work)
 304 {
 305         struct cfg80211_registered_device *rdev;
 306
 307         rdev = container_of(work, struct cfg80211_registered_device,
 308                             rfkill_block);
 309         cfg80211_rfkill_set_block(rdev, true);
 310 }
 311
 312 static void cfg80211_event_work(struct work_struct *work)
 313 {
 314         struct cfg80211_registered_device *rdev;
 315
 316         rdev = container_of(work, struct cfg80211_registered_device,
 317                             event_work);
 318
 319         rtnl_lock();
 320         cfg80211_process_rdev_events(rdev);
 321         rtnl_unlock();
 322 }
 323
 324 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 325 {
 326         struct wireless_dev *wdev, *tmp;
 327
 328         ASSERT_RTNL();
 329
 330         list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
 331                 if (wdev->nl_owner_dead)
 332                         rdev_del_virtual_intf(rdev, wdev);
 333         }
 334 }
 335
 336 static void cfg80211_destroy_iface_wk(struct work_struct *work)
 337 {
 338         struct cfg80211_registered_device *rdev;
 339
 340         rdev = container_of(work, struct cfg80211_registered_device,
 341                             destroy_work);
 342
 343         rtnl_lock();
 344         cfg80211_destroy_ifaces(rdev);
 345         rtnl_unlock();
 346 }
 347
 348 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
 349 {
 350         struct cfg80211_registered_device *rdev;
 351         struct cfg80211_sched_scan_request *req, *tmp;
 352
 353         rdev = container_of(work, struct cfg80211_registered_device,
 354                            sched_scan_stop_wk);
 355
 356         rtnl_lock();
 357         list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
 358                 if (req->nl_owner_dead)
 359                         cfg80211_stop_sched_scan_req(rdev, req, false);
 360         }
 361         rtnl_unlock();
 362 }
 363
 364 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
 365 {
 366         struct cfg80211_registered_device *rdev;
 367
 368         rdev = container_of(work, struct cfg80211_registered_device,
 369                             propagate_radar_detect_wk);
 370
 371         rtnl_lock();
 372
 373         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
 374                                        NL80211_DFS_UNAVAILABLE,
 375                                        NL80211_RADAR_DETECTED);
 376
 377         rtnl_unlock();
 378 }
 379
 380 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
 381 {
 382         struct cfg80211_registered_device *rdev;
 383
 384         rdev = container_of(work, struct cfg80211_registered_device,
 385                             propagate_cac_done_wk);
 386
 387         rtnl_lock();
 388
 389         regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
 390                                        NL80211_DFS_AVAILABLE,
 391                                        NL80211_RADAR_CAC_FINISHED);
 392
 393         rtnl_unlock();
 394 }
 395
 396 /* exported functions */
 397
 398 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 399                            const char *requested_name)
 400 {
 401         static atomic_t wiphy_counter = ATOMIC_INIT(0);
 402
 403         struct cfg80211_registered_device *rdev;
 404         int alloc_size;
 405
 406         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 407         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 408         WARN_ON(ops->connect && !ops->disconnect);
 409         WARN_ON(ops->join_ibss && !ops->leave_ibss);
 410         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 411         WARN_ON(ops->add_station && !ops->del_station);
 412         WARN_ON(ops->add_mpath && !ops->del_mpath);
 413         WARN_ON(ops->join_mesh && !ops->leave_mesh);
 414         WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
 415         WARN_ON(ops->start_ap && !ops->stop_ap);
 416         WARN_ON(ops->join_ocb && !ops->leave_ocb);
 417         WARN_ON(ops->suspend && !ops->resume);
 418         WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
 419         WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
 420         WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
 421         WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
 422
 423         alloc_size = sizeof(*rdev) + sizeof_priv;
 424
 425         rdev = kzalloc(alloc_size, GFP_KERNEL);
 426         if (!rdev)
 427                 return NULL;
 428
 429         rdev->ops = ops;
 430
 431         rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 432
 433         if (unlikely(rdev->wiphy_idx < 0)) {
 434                 /* ugh, wrapped! */
 435                 atomic_dec(&wiphy_counter);
 436                 kfree(rdev);
 437                 return NULL;
 438         }
 439
 440         /* atomic_inc_return makes it start at 1, make it start at 0 */
 441         rdev->wiphy_idx--;
 442
 443         /* give it a proper name */
 444         if (requested_name && requested_name[0]) {
 445                 int rv;
 446
 447                 rtnl_lock();
 448                 rv = cfg80211_dev_check_name(rdev, requested_name);
 449
 450                 if (rv < 0) {
 451                         rtnl_unlock();
 452                         goto use_default_name;
 453                 }
 454
 455                 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 456                 rtnl_unlock();
 457                 if (rv)
 458                         goto use_default_name;
 459         } else {
 460                 int rv;
 461
 462 use_default_name:
 463                 /* NOTE:  This is *probably* safe w/out holding rtnl because of
 464                  * the restrictions on phy names.  Probably this call could
 465                  * fail if some other part of the kernel (re)named a device
 466                  * phyX.  But, might should add some locking and check return
 467                  * value, and use a different name if this one exists?
 468                  */
 469                 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 470                 if (rv < 0) {
 471                         kfree(rdev);
 472                         return NULL;
 473                 }
 474         }
 475
 476         INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
 477         INIT_LIST_HEAD(&rdev->beacon_registrations);
 478         spin_lock_init(&rdev->beacon_registrations_lock);
 479         spin_lock_init(&rdev->bss_lock);
 480         INIT_LIST_HEAD(&rdev->bss_list);
 481         INIT_LIST_HEAD(&rdev->sched_scan_req_list);
 482         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 483         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 484                           cfg80211_dfs_channels_update_work);
 485 #ifdef CONFIG_CFG80211_WEXT
 486         rdev->wiphy.wext = &cfg80211_wext_handler;
 487 #endif
 488
 489         device_initialize(&rdev->wiphy.dev);
 490         rdev->wiphy.dev.class = &ieee80211_class;
 491         rdev->wiphy.dev.platform_data = rdev;
 492         device_enable_async_suspend(&rdev->wiphy.dev);
 493
 494         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 495         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 496         INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
 497         INIT_WORK(&rdev->propagate_radar_detect_wk,
 498                   cfg80211_propagate_radar_detect_wk);
 499         INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
 500         INIT_WORK(&rdev->mgmt_registrations_update_wk,
 501                   cfg80211_mgmt_registrations_update_wk);
 502
 503 #ifdef CONFIG_CFG80211_DEFAULT_PS
 504         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 505 #endif
 506
 507         wiphy_net_set(&rdev->wiphy, &init_net);
 508
 509         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 510         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 511                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 512                                    &rdev->rfkill_ops, rdev);
 513
 514         if (!rdev->rfkill) {
 515                 wiphy_free(&rdev->wiphy);
 516                 return NULL;
 517         }
 518
 519         INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
 520         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 521         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 522
 523         init_waitqueue_head(&rdev->dev_wait);
 524
 525         /*
 526          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 527          * Fragmentation and RTS threshold are disabled by default with the
 528          * special -1 value.
 529          */
 530         rdev->wiphy.retry_short = 7;
 531         rdev->wiphy.retry_long = 4;
 532         rdev->wiphy.frag_threshold = (u32) -1;
 533         rdev->wiphy.rts_threshold = (u32) -1;
 534         rdev->wiphy.coverage_class = 0;
 535
 536         rdev->wiphy.max_num_csa_counters = 1;
 537
 538         rdev->wiphy.max_sched_scan_plans = 1;
 539         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 540
 541         return &rdev->wiphy;
 542 }
 543 EXPORT_SYMBOL(wiphy_new_nm);
 544
 545 static int wiphy_verify_combinations(struct wiphy *wiphy)
 546 {
 547         const struct ieee80211_iface_combination *c;
 548         int i, j;
 549
 550         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 551                 u32 cnt = 0;
 552                 u16 all_iftypes = 0;
 553
 554                 c = &wiphy->iface_combinations[i];
 555
 556                 /*
 557                  * Combinations with just one interface aren't real,
 558                  * however we make an exception for DFS.
 559                  */
 560                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 561                         return -EINVAL;
 562
 563                 /* Need at least one channel */
 564                 if (WARN_ON(!c->num_different_channels))
 565                         return -EINVAL;
 566
 567                 /*
 568                  * Put a sane limit on maximum number of different
 569                  * channels to simplify channel accounting code.
 570                  */
 571                 if (WARN_ON(c->num_different_channels >
 572                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 573                         return -EINVAL;
 574
 575                 /* DFS only works on one channel. */
 576                 if (WARN_ON(c->radar_detect_widths &&
 577                             (c->num_different_channels > 1)))
 578                         return -EINVAL;
 579
 580                 if (WARN_ON(!c->n_limits))
 581                         return -EINVAL;
 582
 583                 for (j = 0; j < c->n_limits; j++) {
 584                         u16 types = c->limits[j].types;
 585
 586                         /* interface types shouldn't overlap */
 587                         if (WARN_ON(types & all_iftypes))
 588                                 return -EINVAL;
 589                         all_iftypes |= types;
 590
 591                         if (WARN_ON(!c->limits[j].max))
 592                                 return -EINVAL;
 593
 594                         /* Shouldn't list software iftypes in combinations! */
 595                         if (WARN_ON(wiphy->software_iftypes & types))
 596                                 return -EINVAL;
 597
 598                         /* Only a single P2P_DEVICE can be allowed */
 599                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 600                                     c->limits[j].max > 1))
 601                                 return -EINVAL;
 602
 603                         /* Only a single NAN can be allowed */
 604                         if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
 605                                     c->limits[j].max > 1))
 606                                 return -EINVAL;
 607
 608                         /*
 609                          * This isn't well-defined right now. If you have an
 610                          * IBSS interface, then its beacon interval may change
 611                          * by joining other networks, and nothing prevents it
 612                          * from doing that.
 613                          * So technically we probably shouldn't even allow AP
 614                          * and IBSS in the same interface, but it seems that
 615                          * some drivers support that, possibly only with fixed
 616                          * beacon intervals for IBSS.
 617                          */
 618                         if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
 619                                     c->beacon_int_min_gcd)) {
 620                                 return -EINVAL;
 621                         }
 622
 623                         cnt += c->limits[j].max;
 624                         /*
 625                          * Don't advertise an unsupported type
 626                          * in a combination.
 627                          */
 628                         if (WARN_ON((wiphy->interface_modes & types) != types))
 629                                 return -EINVAL;
 630                 }
 631
 632 #ifndef CONFIG_WIRELESS_WDS
 633                 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
 634                         return -EINVAL;
 635 #endif
 636
 637                 /* You can't even choose that many! */
 638                 if (WARN_ON(cnt < c->max_interfaces))
 639                         return -EINVAL;
 640         }
 641
 642         return 0;
 643 }
 644
 645 int wiphy_register(struct wiphy *wiphy)
 646 {
 647         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 648         int res;
 649         enum nl80211_band band;
 650         struct ieee80211_supported_band *sband;
 651         bool have_band = false;
 652         int i;
 653         u16 ifmodes = wiphy->interface_modes;
 654
 655 #ifdef CONFIG_PM
 656         if (WARN_ON(wiphy->wowlan &&
 657                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 658                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 659                 return -EINVAL;
 660         if (WARN_ON(wiphy->wowlan &&
 661                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 662                     !wiphy->wowlan->tcp))
 663                 return -EINVAL;
 664 #endif
 665         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 666                     (!rdev->ops->tdls_channel_switch ||
 667                      !rdev->ops->tdls_cancel_channel_switch)))
 668                 return -EINVAL;
 669
 670         if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
 671                     (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
 672                      !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
 673                      !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
 674                 return -EINVAL;
 675
 676 #ifndef CONFIG_WIRELESS_WDS
 677         if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
 678                 return -EINVAL;
 679 #endif
 680
 681         if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
 682                 return -EINVAL;
 683
 684         if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
 685                 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
 686                             !wiphy->pmsr_capa->ftm.non_asap))
 687                         return -EINVAL;
 688                 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
 689                             !wiphy->pmsr_capa->ftm.bandwidths))
 690                         return -EINVAL;
 691                 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
 692                                 ~(BIT(NL80211_PREAMBLE_LEGACY) |
 693                                   BIT(NL80211_PREAMBLE_HT) |
 694                                   BIT(NL80211_PREAMBLE_VHT) |
 695                                   BIT(NL80211_PREAMBLE_HE) |
 696                                   BIT(NL80211_PREAMBLE_DMG))))
 697                         return -EINVAL;
 698                 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
 699                              wiphy->pmsr_capa->ftm.non_trigger_based) &&
 700                             !(wiphy->pmsr_capa->ftm.preambles &
 701                               BIT(NL80211_PREAMBLE_HE))))
 702                         return -EINVAL;
 703                 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
 704                                 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
 705                                   BIT(NL80211_CHAN_WIDTH_20) |
 706                                   BIT(NL80211_CHAN_WIDTH_40) |
 707                                   BIT(NL80211_CHAN_WIDTH_80) |
 708                                   BIT(NL80211_CHAN_WIDTH_80P80) |
 709                                   BIT(NL80211_CHAN_WIDTH_160) |
 710                                   BIT(NL80211_CHAN_WIDTH_5) |
 711                                   BIT(NL80211_CHAN_WIDTH_10))))
 712                         return -EINVAL;
 713         }
 714
 715         /*
 716          * if a wiphy has unsupported modes for regulatory channel enforcement,
 717          * opt-out of enforcement checking
 718          */
 719         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 720                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 721                                        BIT(NL80211_IFTYPE_AP) |
 722                                        BIT(NL80211_IFTYPE_P2P_GO) |
 723                                        BIT(NL80211_IFTYPE_ADHOC) |
 724                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 725                                        BIT(NL80211_IFTYPE_NAN) |
 726                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 727                                        BIT(NL80211_IFTYPE_MONITOR)))
 728                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 729
 730         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 731                     (wiphy->regulatory_flags &
 732                                         (REGULATORY_CUSTOM_REG |
 733                                          REGULATORY_STRICT_REG |
 734                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 735                                          REGULATORY_COUNTRY_IE_IGNORE))))
 736                 return -EINVAL;
 737
 738         if (WARN_ON(wiphy->coalesce &&
 739                     (!wiphy->coalesce->n_rules ||
 740                      !wiphy->coalesce->n_patterns) &&
 741                     (!wiphy->coalesce->pattern_min_len ||
 742                      wiphy->coalesce->pattern_min_len >
 743                         wiphy->coalesce->pattern_max_len)))
 744                 return -EINVAL;
 745
 746         if (WARN_ON(wiphy->ap_sme_capa &&
 747                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 748                 return -EINVAL;
 749
 750         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 751                 return -EINVAL;
 752
 753         if (WARN_ON(wiphy->addresses &&
 754                     !is_zero_ether_addr(wiphy->perm_addr) &&
 755                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 756                            ETH_ALEN)))
 757                 return -EINVAL;
 758
 759         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 760                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 761                      !rdev->ops->set_mac_acl)))
 762                 return -EINVAL;
 763
 764         /* assure only valid behaviours are flagged by driver
 765          * hence subtract 2 as bit 0 is invalid.
 766          */
 767         if (WARN_ON(wiphy->bss_select_support &&
 768                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 769                 return -EINVAL;
 770
 771         if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
 772                                             NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
 773                     (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
 774                 return -EINVAL;
 775
 776         if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
 777                     rdev->ops->update_connect_params))
 778                 return -EINVAL;
 779
 780         if (wiphy->addresses)
 781                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 782
 783         /* sanity check ifmodes */
 784         WARN_ON(!ifmodes);
 785         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 786         if (WARN_ON(ifmodes != wiphy->interface_modes))
 787                 wiphy->interface_modes = ifmodes;
 788
 789         res = wiphy_verify_combinations(wiphy);
 790         if (res)
 791                 return res;
 792
 793         /* sanity check supported bands/channels */
 794         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 795                 u16 types = 0;
 796                 bool have_he = false;
 797
 798                 sband = wiphy->bands[band];
 799                 if (!sband)
 800                         continue;
 801
 802                 sband->band = band;
 803                 if (WARN_ON(!sband->n_channels))
 804                         return -EINVAL;
 805                 /*
 806                  * on 60GHz or sub-1Ghz band, there are no legacy rates, so
 807                  * n_bitrates is 0
 808                  */
 809                 if (WARN_ON((band != NL80211_BAND_60GHZ &&
 810                              band != NL80211_BAND_S1GHZ) &&
 811                             !sband->n_bitrates))
 812                         return -EINVAL;
 813
 814                 if (WARN_ON(band == NL80211_BAND_6GHZ &&
 815                             (sband->ht_cap.ht_supported ||
 816                              sband->vht_cap.vht_supported)))
 817                         return -EINVAL;
 818
 819                 /*
 820                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 821                  * modify the sband's ht data even if the driver uses a
 822                  * global structure for that.
 823                  */
 824                 if (cfg80211_disable_40mhz_24ghz &&
 825                     band == NL80211_BAND_2GHZ &&
 826                     sband->ht_cap.ht_supported) {
 827                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 828                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 829                 }
 830
 831                 /*
 832                  * Since we use a u32 for rate bitmaps in
 833                  * ieee80211_get_response_rate, we cannot
 834                  * have more than 32 legacy rates.
 835                  */
 836                 if (WARN_ON(sband->n_bitrates > 32))
 837                         return -EINVAL;
 838
 839                 for (i = 0; i < sband->n_channels; i++) {
 840                         sband->channels[i].orig_flags =
 841                                 sband->channels[i].flags;
 842                         sband->channels[i].orig_mag = INT_MAX;
 843                         sband->channels[i].orig_mpwr =
 844                                 sband->channels[i].max_power;
 845                         sband->channels[i].band = band;
 846
 847                         if (WARN_ON(sband->channels[i].freq_offset >= 1000))
 848                                 return -EINVAL;
 849                 }
 850
 851                 for (i = 0; i < sband->n_iftype_data; i++) {
 852                         const struct ieee80211_sband_iftype_data *iftd;
 853
 854                         iftd = &sband->iftype_data[i];
 855
 856                         if (WARN_ON(!iftd->types_mask))
 857                                 return -EINVAL;
 858                         if (WARN_ON(types & iftd->types_mask))
 859                                 return -EINVAL;
 860
 861                         /* at least one piece of information must be present */
 862                         if (WARN_ON(!iftd->he_cap.has_he))
 863                                 return -EINVAL;
 864
 865                         types |= iftd->types_mask;
 866
 867                         if (i == 0)
 868                                 have_he = iftd->he_cap.has_he;
 869                         else
 870                                 have_he = have_he &&
 871                                           iftd->he_cap.has_he;
 872                 }
 873
 874                 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
 875                         return -EINVAL;
 876
 877                 have_band = true;
 878         }
 879
 880         if (!have_band) {
 881                 WARN_ON(1);
 882                 return -EINVAL;
 883         }
 884
 885         for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
 886                 /*
 887                  * Validate we have a policy (can be explicitly set to
 888                  * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
 889                  * we have at least one of doit/dumpit.
 890                  */
 891                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
 892                         return -EINVAL;
 893                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
 894                             !rdev->wiphy.vendor_commands[i].dumpit))
 895                         return -EINVAL;
 896         }
 897
 898 #ifdef CONFIG_PM
 899         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 900                     (!rdev->wiphy.wowlan->pattern_min_len ||
 901                      rdev->wiphy.wowlan->pattern_min_len >
 902                                 rdev->wiphy.wowlan->pattern_max_len)))
 903                 return -EINVAL;
 904 #endif
 905
 906         /* check and set up bitrates */
 907         ieee80211_set_bitrate_flags(wiphy);
 908
 909         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 910
 911         rtnl_lock();
 912         res = device_add(&rdev->wiphy.dev);
 913         if (res) {
 914                 rtnl_unlock();
 915                 return res;
 916         }
 917
 918         /* set up regulatory info */
 919         wiphy_regulatory_register(wiphy);
 920
 921         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 922         cfg80211_rdev_list_generation++;
 923
 924         /* add to debugfs */
 925         rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
 926                                                     ieee80211_debugfs_dir);
 927
 928         cfg80211_debugfs_rdev_add(rdev);
 929         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 930
 931         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 932                 struct regulatory_request request;
 933
 934                 request.wiphy_idx = get_wiphy_idx(wiphy);
 935                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 936                 request.alpha2[0] = '9';
 937                 request.alpha2[1] = '9';
 938
 939                 nl80211_send_reg_change_event(&request);
 940         }
 941
 942         /* Check that nobody globally advertises any capabilities they do not
 943          * advertise on all possible interface types.
 944          */
 945         if (wiphy->extended_capabilities_len &&
 946             wiphy->num_iftype_ext_capab &&
 947             wiphy->iftype_ext_capab) {
 948                 u8 supported_on_all, j;
 949                 const struct wiphy_iftype_ext_capab *capab;
 950
 951                 capab = wiphy->iftype_ext_capab;
 952                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
 953                         if (capab[0].extended_capabilities_len > j)
 954                                 supported_on_all =
 955                                         capab[0].extended_capabilities[j];
 956                         else
 957                                 supported_on_all = 0x00;
 958                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
 959                                 if (j >= capab[i].extended_capabilities_len) {
 960                                         supported_on_all = 0x00;
 961                                         break;
 962                                 }
 963                                 supported_on_all &=
 964                                         capab[i].extended_capabilities[j];
 965                         }
 966                         if (WARN_ON(wiphy->extended_capabilities[j] &
 967                                     ~supported_on_all))
 968                                 break;
 969                 }
 970         }
 971
 972         rdev->wiphy.registered = true;
 973         rtnl_unlock();
 974
 975         res = rfkill_register(rdev->rfkill);
 976         if (res) {
 977                 rfkill_destroy(rdev->rfkill);
 978                 rdev->rfkill = NULL;
 979                 wiphy_unregister(&rdev->wiphy);
 980                 return res;
 981         }
 982
 983         return 0;
 984 }
 985 EXPORT_SYMBOL(wiphy_register);
 986
 987 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 988 {
 989         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 990
 991         if (!rdev->ops->rfkill_poll)
 992                 return;
 993         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 994         rfkill_resume_polling(rdev->rfkill);
 995 }
 996 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 997
 998 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 999 {
1000         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1001
1002         rfkill_pause_polling(rdev->rfkill);
1003 }
1004 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
1005
1006 void wiphy_unregister(struct wiphy *wiphy)
1007 {
1008         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1009
1010         wait_event(rdev->dev_wait, ({
1011                 int __count;
1012                 rtnl_lock();
1013                 __count = rdev->opencount;
1014                 rtnl_unlock();
1015                 __count == 0; }));
1016
1017         if (rdev->rfkill)
1018                 rfkill_unregister(rdev->rfkill);
1019
1020         rtnl_lock();
1021         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1022         rdev->wiphy.registered = false;
1023
1024         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1025
1026         /*
1027          * First remove the hardware from everywhere, this makes
1028          * it impossible to find from userspace.
1029          */
1030         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1031         list_del_rcu(&rdev->list);
1032         synchronize_rcu();
1033
1034         /*
1035          * If this device got a regulatory hint tell core its
1036          * free to listen now to a new shiny device regulatory hint
1037          */
1038         wiphy_regulatory_deregister(wiphy);
1039
1040         cfg80211_rdev_list_generation++;
1041         device_del(&rdev->wiphy.dev);
1042
1043         rtnl_unlock();
1044
1045         flush_work(&rdev->scan_done_wk);
1046         cancel_work_sync(&rdev->conn_work);
1047         flush_work(&rdev->event_work);
1048         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1049         flush_work(&rdev->destroy_work);
1050         flush_work(&rdev->sched_scan_stop_wk);
1051         flush_work(&rdev->propagate_radar_detect_wk);
1052         flush_work(&rdev->propagate_cac_done_wk);
1053         flush_work(&rdev->mgmt_registrations_update_wk);
1054
1055 #ifdef CONFIG_PM
1056         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1057                 rdev_set_wakeup(rdev, false);
1058 #endif
1059         cfg80211_rdev_free_wowlan(rdev);
1060         cfg80211_rdev_free_coalesce(rdev);
1061 }
1062 EXPORT_SYMBOL(wiphy_unregister);
1063
1064 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1065 {
1066         struct cfg80211_internal_bss *scan, *tmp;
1067         struct cfg80211_beacon_registration *reg, *treg;
1068         rfkill_destroy(rdev->rfkill);
1069         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1070                 list_del(&reg->list);
1071                 kfree(reg);
1072         }
1073         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1074                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1075         kfree(rdev);
1076 }
1077
1078 void wiphy_free(struct wiphy *wiphy)
1079 {
1080         put_device(&wiphy->dev);
1081 }
1082 EXPORT_SYMBOL(wiphy_free);
1083
1084 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
1085 {
1086         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1087
1088         if (rfkill_set_hw_state(rdev->rfkill, blocked))
1089                 schedule_work(&rdev->rfkill_block);
1090 }
1091 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
1092
1093 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1094 {
1095         kfree(wdev->cqm_config);
1096         wdev->cqm_config = NULL;
1097 }
1098
1099 static void __cfg80211_unregister_wdev(struct wireless_dev *wdev, bool sync)
1100 {
1101         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1102
1103         ASSERT_RTNL();
1104
1105         flush_work(&wdev->pmsr_free_wk);
1106
1107         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1108
1109         list_del_rcu(&wdev->list);
1110         if (sync)
1111                 synchronize_rcu();
1112         rdev->devlist_generation++;
1113
1114         cfg80211_mlme_purge_registrations(wdev);
1115
1116         switch (wdev->iftype) {
1117         case NL80211_IFTYPE_P2P_DEVICE:
1118                 cfg80211_stop_p2p_device(rdev, wdev);
1119                 break;
1120         case NL80211_IFTYPE_NAN:
1121                 cfg80211_stop_nan(rdev, wdev);
1122                 break;
1123         default:
1124                 break;
1125         }
1126
1127 #ifdef CONFIG_CFG80211_WEXT
1128         kzfree(wdev->wext.keys);
1129         wdev->wext.keys = NULL;
1130 #endif
1131         /* only initialized if we have a netdev */
1132         if (wdev->netdev)
1133                 flush_work(&wdev->disconnect_wk);
1134
1135         cfg80211_cqm_config_free(wdev);
1136 }
1137
1138 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1139 {
1140         if (WARN_ON(wdev->netdev))
1141                 return;
1142
1143         __cfg80211_unregister_wdev(wdev, true);
1144 }
1145 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1146
1147 static const struct device_type wiphy_type = {
1148         .name   = "wlan",
1149 };
1150
1151 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1152                                enum nl80211_iftype iftype, int num)
1153 {
1154         ASSERT_RTNL();
1155
1156         rdev->num_running_ifaces += num;
1157         if (iftype == NL80211_IFTYPE_MONITOR)
1158                 rdev->num_running_monitor_ifaces += num;
1159 }
1160
1161 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1162                       struct wireless_dev *wdev)
1163 {
1164         struct net_device *dev = wdev->netdev;
1165         struct cfg80211_sched_scan_request *pos, *tmp;
1166
1167         ASSERT_RTNL();
1168         ASSERT_WDEV_LOCK(wdev);
1169
1170         cfg80211_pmsr_wdev_down(wdev);
1171
1172         switch (wdev->iftype) {
1173         case NL80211_IFTYPE_ADHOC:
1174                 __cfg80211_leave_ibss(rdev, dev, true);
1175                 break;
1176         case NL80211_IFTYPE_P2P_CLIENT:
1177         case NL80211_IFTYPE_STATION:
1178                 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1179                                          list) {
1180                         if (dev == pos->dev)
1181                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1182                 }
1183
1184 #ifdef CONFIG_CFG80211_WEXT
1185                 kfree(wdev->wext.ie);
1186                 wdev->wext.ie = NULL;
1187                 wdev->wext.ie_len = 0;
1188                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1189 #endif
1190                 cfg80211_disconnect(rdev, dev,
1191                                     WLAN_REASON_DEAUTH_LEAVING, true);
1192                 break;
1193         case NL80211_IFTYPE_MESH_POINT:
1194                 __cfg80211_leave_mesh(rdev, dev);
1195                 break;
1196         case NL80211_IFTYPE_AP:
1197         case NL80211_IFTYPE_P2P_GO:
1198                 __cfg80211_stop_ap(rdev, dev, true);
1199                 break;
1200         case NL80211_IFTYPE_OCB:
1201                 __cfg80211_leave_ocb(rdev, dev);
1202                 break;
1203         case NL80211_IFTYPE_WDS:
1204                 /* must be handled by mac80211/driver, has no APIs */
1205                 break;
1206         case NL80211_IFTYPE_P2P_DEVICE:
1207         case NL80211_IFTYPE_NAN:
1208                 /* cannot happen, has no netdev */
1209                 break;
1210         case NL80211_IFTYPE_AP_VLAN:
1211         case NL80211_IFTYPE_MONITOR:
1212                 /* nothing to do */
1213                 break;
1214         case NL80211_IFTYPE_UNSPECIFIED:
1215         case NUM_NL80211_IFTYPES:
1216                 /* invalid */
1217                 break;
1218         }
1219 }
1220
1221 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1222                     struct wireless_dev *wdev)
1223 {
1224         wdev_lock(wdev);
1225         __cfg80211_leave(rdev, wdev);
1226         wdev_unlock(wdev);
1227 }
1228
1229 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1230                          gfp_t gfp)
1231 {
1232         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1233         struct cfg80211_event *ev;
1234         unsigned long flags;
1235
1236         trace_cfg80211_stop_iface(wiphy, wdev);
1237
1238         ev = kzalloc(sizeof(*ev), gfp);
1239         if (!ev)
1240                 return;
1241
1242         ev->type = EVENT_STOPPED;
1243
1244         spin_lock_irqsave(&wdev->event_lock, flags);
1245         list_add_tail(&ev->list, &wdev->event_list);
1246         spin_unlock_irqrestore(&wdev->event_lock, flags);
1247         queue_work(cfg80211_wq, &rdev->event_work);
1248 }
1249 EXPORT_SYMBOL(cfg80211_stop_iface);
1250
1251 void cfg80211_init_wdev(struct cfg80211_registered_device *rdev,
1252                         struct wireless_dev *wdev)
1253 {
1254         mutex_init(&wdev->mtx);
1255         INIT_LIST_HEAD(&wdev->event_list);
1256         spin_lock_init(&wdev->event_lock);
1257         INIT_LIST_HEAD(&wdev->mgmt_registrations);
1258         spin_lock_init(&wdev->mgmt_registrations_lock);
1259         INIT_LIST_HEAD(&wdev->pmsr_list);
1260         spin_lock_init(&wdev->pmsr_lock);
1261         INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1262
1263         /*
1264          * We get here also when the interface changes network namespaces,
1265          * as it's registered into the new one, but we don't want it to
1266          * change ID in that case. Checking if the ID is already assigned
1267          * works, because 0 isn't considered a valid ID and the memory is
1268          * 0-initialized.
1269          */
1270         if (!wdev->identifier)
1271                 wdev->identifier = ++rdev->wdev_id;
1272         list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1273         rdev->devlist_generation++;
1274
1275         nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1276 }
1277
1278 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1279                                          unsigned long state, void *ptr)
1280 {
1281         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1282         struct wireless_dev *wdev = dev->ieee80211_ptr;
1283         struct cfg80211_registered_device *rdev;
1284         struct cfg80211_sched_scan_request *pos, *tmp;
1285
1286         if (!wdev)
1287                 return NOTIFY_DONE;
1288
1289         rdev = wiphy_to_rdev(wdev->wiphy);
1290
1291         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1292
1293         switch (state) {
1294         case NETDEV_POST_INIT:
1295                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1296                 break;
1297         case NETDEV_REGISTER:
1298                 /*
1299                  * NB: cannot take rdev->mtx here because this may be
1300                  * called within code protected by it when interfaces
1301                  * are added with nl80211.
1302                  */
1303                 /* can only change netns with wiphy */
1304                 dev->features |= NETIF_F_NETNS_LOCAL;
1305
1306                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1307                                       "phy80211")) {
1308                         pr_err("failed to add phy80211 symlink to netdev!\n");
1309                 }
1310                 wdev->netdev = dev;
1311 #ifdef CONFIG_CFG80211_WEXT
1312                 wdev->wext.default_key = -1;
1313                 wdev->wext.default_mgmt_key = -1;
1314                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1315 #endif
1316
1317                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1318                         wdev->ps = true;
1319                 else
1320                         wdev->ps = false;
1321                 /* allow mac80211 to determine the timeout */
1322                 wdev->ps_timeout = -1;
1323
1324                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1325                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1326                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1327                         dev->priv_flags |= IFF_DONT_BRIDGE;
1328
1329                 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1330
1331                 cfg80211_init_wdev(rdev, wdev);
1332                 break;
1333         case NETDEV_GOING_DOWN:
1334                 cfg80211_leave(rdev, wdev);
1335                 break;
1336         case NETDEV_DOWN:
1337                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1338                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1339                         if (WARN_ON(!rdev->scan_req->notified))
1340                                 rdev->scan_req->info.aborted = true;
1341                         ___cfg80211_scan_done(rdev, false);
1342                 }
1343
1344                 list_for_each_entry_safe(pos, tmp,
1345                                          &rdev->sched_scan_req_list, list) {
1346                         if (WARN_ON(pos->dev == wdev->netdev))
1347                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1348                 }
1349
1350                 rdev->opencount--;
1351                 wake_up(&rdev->dev_wait);
1352                 break;
1353         case NETDEV_UP:
1354                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1355                 wdev_lock(wdev);
1356                 switch (wdev->iftype) {
1357 #ifdef CONFIG_CFG80211_WEXT
1358                 case NL80211_IFTYPE_ADHOC:
1359                         cfg80211_ibss_wext_join(rdev, wdev);
1360                         break;
1361                 case NL80211_IFTYPE_STATION:
1362                         cfg80211_mgd_wext_connect(rdev, wdev);
1363                         break;
1364 #endif
1365 #ifdef CONFIG_MAC80211_MESH
1366                 case NL80211_IFTYPE_MESH_POINT:
1367                         {
1368                                 /* backward compat code... */
1369                                 struct mesh_setup setup;
1370                                 memcpy(&setup, &default_mesh_setup,
1371                                                 sizeof(setup));
1372                                  /* back compat only needed for mesh_id */
1373                                 setup.mesh_id = wdev->ssid;
1374                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1375                                 if (wdev->mesh_id_up_len)
1376                                         __cfg80211_join_mesh(rdev, dev,
1377                                                         &setup,
1378                                                         &default_mesh_config);
1379                                 break;
1380                         }
1381 #endif
1382                 default:
1383                         break;
1384                 }
1385                 wdev_unlock(wdev);
1386                 rdev->opencount++;
1387
1388                 /*
1389                  * Configure power management to the driver here so that its
1390                  * correctly set also after interface type changes etc.
1391                  */
1392                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1393                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1394                     rdev->ops->set_power_mgmt &&
1395                     rdev_set_power_mgmt(rdev, dev, wdev->ps,
1396                                         wdev->ps_timeout)) {
1397                         /* assume this means it's off */
1398                         wdev->ps = false;
1399                 }
1400                 break;
1401         case NETDEV_UNREGISTER:
1402                 /*
1403                  * It is possible to get NETDEV_UNREGISTER
1404                  * multiple times. To detect that, check
1405                  * that the interface is still on the list
1406                  * of registered interfaces, and only then
1407                  * remove and clean it up.
1408                  */
1409                 if (!list_empty(&wdev->list)) {
1410                         __cfg80211_unregister_wdev(wdev, false);
1411                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1412                 }
1413                 /*
1414                  * synchronise (so that we won't find this netdev
1415                  * from other code any more) and then clear the list
1416                  * head so that the above code can safely check for
1417                  * !list_empty() to avoid double-cleanup.
1418                  */
1419                 synchronize_rcu();
1420                 INIT_LIST_HEAD(&wdev->list);
1421                 /*
1422                  * Ensure that all events have been processed and
1423                  * freed.
1424                  */
1425                 cfg80211_process_wdev_events(wdev);
1426
1427                 if (WARN_ON(wdev->current_bss)) {
1428                         cfg80211_unhold_bss(wdev->current_bss);
1429                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1430                         wdev->current_bss = NULL;
1431                 }
1432                 break;
1433         case NETDEV_PRE_UP:
1434                 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1435                                              wdev->use_4addr, 0))
1436                         return notifier_from_errno(-EOPNOTSUPP);
1437
1438                 if (rfkill_blocked(rdev->rfkill))
1439                         return notifier_from_errno(-ERFKILL);
1440                 break;
1441         default:
1442                 return NOTIFY_DONE;
1443         }
1444
1445         wireless_nlevent_flush();
1446
1447         return NOTIFY_OK;
1448 }
1449
1450 static struct notifier_block cfg80211_netdev_notifier = {
1451         .notifier_call = cfg80211_netdev_notifier_call,
1452 };
1453
1454 static void __net_exit cfg80211_pernet_exit(struct net *net)
1455 {
1456         struct cfg80211_registered_device *rdev;
1457
1458         rtnl_lock();
1459         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1460                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1461                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1462         }
1463         rtnl_unlock();
1464 }
1465
1466 static struct pernet_operations cfg80211_pernet_ops = {
1467         .exit = cfg80211_pernet_exit,
1468 };
1469
1470 static int __init cfg80211_init(void)
1471 {
1472         int err;
1473
1474         err = register_pernet_device(&cfg80211_pernet_ops);
1475         if (err)
1476                 goto out_fail_pernet;
1477
1478         err = wiphy_sysfs_init();
1479         if (err)
1480                 goto out_fail_sysfs;
1481
1482         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1483         if (err)
1484                 goto out_fail_notifier;
1485
1486         err = nl80211_init();
1487         if (err)
1488                 goto out_fail_nl80211;
1489
1490         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1491
1492         err = regulatory_init();
1493         if (err)
1494                 goto out_fail_reg;
1495
1496         cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1497         if (!cfg80211_wq) {
1498                 err = -ENOMEM;
1499                 goto out_fail_wq;
1500         }
1501
1502         return 0;
1503
1504 out_fail_wq:
1505         regulatory_exit();
1506 out_fail_reg:
1507         debugfs_remove(ieee80211_debugfs_dir);
1508         nl80211_exit();
1509 out_fail_nl80211:
1510         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1511 out_fail_notifier:
1512         wiphy_sysfs_exit();
1513 out_fail_sysfs:
1514         unregister_pernet_device(&cfg80211_pernet_ops);
1515 out_fail_pernet:
1516         return err;
1517 }
1518 fs_initcall(cfg80211_init);
1519
1520 static void __exit cfg80211_exit(void)
1521 {
1522         debugfs_remove(ieee80211_debugfs_dir);
1523         nl80211_exit();
1524         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1525         wiphy_sysfs_exit();
1526         regulatory_exit();
1527         unregister_pernet_device(&cfg80211_pernet_ops);
1528         destroy_workqueue(cfg80211_wq);
1529 }
1530 module_exit(cfg80211_exit);