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) 2018-2019 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 (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
 501 #ifdef CONFIG_CFG80211_DEFAULT_PS
 502         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 503 #endif
 504
 505         wiphy_net_set(&rdev->wiphy, &init_net);
 506
 507         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 508         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 509                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 510                                    &rdev->rfkill_ops, rdev);
 511
 512         if (!rdev->rfkill) {
 513                 wiphy_free(&rdev->wiphy);
 514                 return NULL;
 515         }
 516
 517         INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
 518         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 519         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 520
 521         init_waitqueue_head(&rdev->dev_wait);
 522
 523         /*
 524          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 525          * Fragmentation and RTS threshold are disabled by default with the
 526          * special -1 value.
 527          */
 528         rdev->wiphy.retry_short = 7;
 529         rdev->wiphy.retry_long = 4;
 530         rdev->wiphy.frag_threshold = (u32) -1;
 531         rdev->wiphy.rts_threshold = (u32) -1;
 532         rdev->wiphy.coverage_class = 0;
 533
 534         rdev->wiphy.max_num_csa_counters = 1;
 535
 536         rdev->wiphy.max_sched_scan_plans = 1;
 537         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 538
 539         return &rdev->wiphy;
 540 }
 541 EXPORT_SYMBOL(wiphy_new_nm);
 542
 543 static int wiphy_verify_combinations(struct wiphy *wiphy)
 544 {
 545         const struct ieee80211_iface_combination *c;
 546         int i, j;
 547
 548         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 549                 u32 cnt = 0;
 550                 u16 all_iftypes = 0;
 551
 552                 c = &wiphy->iface_combinations[i];
 553
 554                 /*
 555                  * Combinations with just one interface aren't real,
 556                  * however we make an exception for DFS.
 557                  */
 558                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 559                         return -EINVAL;
 560
 561                 /* Need at least one channel */
 562                 if (WARN_ON(!c->num_different_channels))
 563                         return -EINVAL;
 564
 565                 /*
 566                  * Put a sane limit on maximum number of different
 567                  * channels to simplify channel accounting code.
 568                  */
 569                 if (WARN_ON(c->num_different_channels >
 570                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 571                         return -EINVAL;
 572
 573                 /* DFS only works on one channel. */
 574                 if (WARN_ON(c->radar_detect_widths &&
 575                             (c->num_different_channels > 1)))
 576                         return -EINVAL;
 577
 578                 if (WARN_ON(!c->n_limits))
 579                         return -EINVAL;
 580
 581                 for (j = 0; j < c->n_limits; j++) {
 582                         u16 types = c->limits[j].types;
 583
 584                         /* interface types shouldn't overlap */
 585                         if (WARN_ON(types & all_iftypes))
 586                                 return -EINVAL;
 587                         all_iftypes |= types;
 588
 589                         if (WARN_ON(!c->limits[j].max))
 590                                 return -EINVAL;
 591
 592                         /* Shouldn't list software iftypes in combinations! */
 593                         if (WARN_ON(wiphy->software_iftypes & types))
 594                                 return -EINVAL;
 595
 596                         /* Only a single P2P_DEVICE can be allowed */
 597                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 598                                     c->limits[j].max > 1))
 599                                 return -EINVAL;
 600
 601                         /* Only a single NAN can be allowed */
 602                         if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
 603                                     c->limits[j].max > 1))
 604                                 return -EINVAL;
 605
 606                         /*
 607                          * This isn't well-defined right now. If you have an
 608                          * IBSS interface, then its beacon interval may change
 609                          * by joining other networks, and nothing prevents it
 610                          * from doing that.
 611                          * So technically we probably shouldn't even allow AP
 612                          * and IBSS in the same interface, but it seems that
 613                          * some drivers support that, possibly only with fixed
 614                          * beacon intervals for IBSS.
 615                          */
 616                         if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
 617                                     c->beacon_int_min_gcd)) {
 618                                 return -EINVAL;
 619                         }
 620
 621                         cnt += c->limits[j].max;
 622                         /*
 623                          * Don't advertise an unsupported type
 624                          * in a combination.
 625                          */
 626                         if (WARN_ON((wiphy->interface_modes & types) != types))
 627                                 return -EINVAL;
 628                 }
 629
 630 #ifndef CONFIG_WIRELESS_WDS
 631                 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
 632                         return -EINVAL;
 633 #endif
 634
 635                 /* You can't even choose that many! */
 636                 if (WARN_ON(cnt < c->max_interfaces))
 637                         return -EINVAL;
 638         }
 639
 640         return 0;
 641 }
 642
 643 int wiphy_register(struct wiphy *wiphy)
 644 {
 645         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 646         int res;
 647         enum nl80211_band band;
 648         struct ieee80211_supported_band *sband;
 649         bool have_band = false;
 650         int i;
 651         u16 ifmodes = wiphy->interface_modes;
 652
 653 #ifdef CONFIG_PM
 654         if (WARN_ON(wiphy->wowlan &&
 655                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 656                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 657                 return -EINVAL;
 658         if (WARN_ON(wiphy->wowlan &&
 659                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 660                     !wiphy->wowlan->tcp))
 661                 return -EINVAL;
 662 #endif
 663         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 664                     (!rdev->ops->tdls_channel_switch ||
 665                      !rdev->ops->tdls_cancel_channel_switch)))
 666                 return -EINVAL;
 667
 668         if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
 669                     (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
 670                      !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
 671                      !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
 672                 return -EINVAL;
 673
 674 #ifndef CONFIG_WIRELESS_WDS
 675         if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
 676                 return -EINVAL;
 677 #endif
 678
 679         if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
 680                 return -EINVAL;
 681
 682         if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
 683                 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
 684                             !wiphy->pmsr_capa->ftm.non_asap))
 685                         return -EINVAL;
 686                 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
 687                             !wiphy->pmsr_capa->ftm.bandwidths))
 688                         return -EINVAL;
 689                 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
 690                                 ~(BIT(NL80211_PREAMBLE_LEGACY) |
 691                                   BIT(NL80211_PREAMBLE_HT) |
 692                                   BIT(NL80211_PREAMBLE_VHT) |
 693                                   BIT(NL80211_PREAMBLE_HE) |
 694                                   BIT(NL80211_PREAMBLE_DMG))))
 695                         return -EINVAL;
 696                 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
 697                              wiphy->pmsr_capa->ftm.non_trigger_based) &&
 698                             !(wiphy->pmsr_capa->ftm.preambles &
 699                               BIT(NL80211_PREAMBLE_HE))))
 700                         return -EINVAL;
 701                 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
 702                                 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
 703                                   BIT(NL80211_CHAN_WIDTH_20) |
 704                                   BIT(NL80211_CHAN_WIDTH_40) |
 705                                   BIT(NL80211_CHAN_WIDTH_80) |
 706                                   BIT(NL80211_CHAN_WIDTH_80P80) |
 707                                   BIT(NL80211_CHAN_WIDTH_160) |
 708                                   BIT(NL80211_CHAN_WIDTH_5) |
 709                                   BIT(NL80211_CHAN_WIDTH_10))))
 710                         return -EINVAL;
 711         }
 712
 713         /*
 714          * if a wiphy has unsupported modes for regulatory channel enforcement,
 715          * opt-out of enforcement checking
 716          */
 717         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 718                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 719                                        BIT(NL80211_IFTYPE_AP) |
 720                                        BIT(NL80211_IFTYPE_P2P_GO) |
 721                                        BIT(NL80211_IFTYPE_ADHOC) |
 722                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 723                                        BIT(NL80211_IFTYPE_NAN) |
 724                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 725                                        BIT(NL80211_IFTYPE_MONITOR)))
 726                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 727
 728         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 729                     (wiphy->regulatory_flags &
 730                                         (REGULATORY_CUSTOM_REG |
 731                                          REGULATORY_STRICT_REG |
 732                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 733                                          REGULATORY_COUNTRY_IE_IGNORE))))
 734                 return -EINVAL;
 735
 736         if (WARN_ON(wiphy->coalesce &&
 737                     (!wiphy->coalesce->n_rules ||
 738                      !wiphy->coalesce->n_patterns) &&
 739                     (!wiphy->coalesce->pattern_min_len ||
 740                      wiphy->coalesce->pattern_min_len >
 741                         wiphy->coalesce->pattern_max_len)))
 742                 return -EINVAL;
 743
 744         if (WARN_ON(wiphy->ap_sme_capa &&
 745                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 746                 return -EINVAL;
 747
 748         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 749                 return -EINVAL;
 750
 751         if (WARN_ON(wiphy->addresses &&
 752                     !is_zero_ether_addr(wiphy->perm_addr) &&
 753                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 754                            ETH_ALEN)))
 755                 return -EINVAL;
 756
 757         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 758                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 759                      !rdev->ops->set_mac_acl)))
 760                 return -EINVAL;
 761
 762         /* assure only valid behaviours are flagged by driver
 763          * hence subtract 2 as bit 0 is invalid.
 764          */
 765         if (WARN_ON(wiphy->bss_select_support &&
 766                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 767                 return -EINVAL;
 768
 769         if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
 770                                             NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
 771                     (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
 772                 return -EINVAL;
 773
 774         if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
 775                     rdev->ops->update_connect_params))
 776                 return -EINVAL;
 777
 778         if (wiphy->addresses)
 779                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 780
 781         /* sanity check ifmodes */
 782         WARN_ON(!ifmodes);
 783         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 784         if (WARN_ON(ifmodes != wiphy->interface_modes))
 785                 wiphy->interface_modes = ifmodes;
 786
 787         res = wiphy_verify_combinations(wiphy);
 788         if (res)
 789                 return res;
 790
 791         /* sanity check supported bands/channels */
 792         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 793                 u16 types = 0;
 794
 795                 sband = wiphy->bands[band];
 796                 if (!sband)
 797                         continue;
 798
 799                 sband->band = band;
 800                 if (WARN_ON(!sband->n_channels))
 801                         return -EINVAL;
 802                 /*
 803                  * on 60GHz band, there are no legacy rates, so
 804                  * n_bitrates is 0
 805                  */
 806                 if (WARN_ON(band != NL80211_BAND_60GHZ &&
 807                             !sband->n_bitrates))
 808                         return -EINVAL;
 809
 810                 /*
 811                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 812                  * modify the sband's ht data even if the driver uses a
 813                  * global structure for that.
 814                  */
 815                 if (cfg80211_disable_40mhz_24ghz &&
 816                     band == NL80211_BAND_2GHZ &&
 817                     sband->ht_cap.ht_supported) {
 818                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 819                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 820                 }
 821
 822                 /*
 823                  * Since we use a u32 for rate bitmaps in
 824                  * ieee80211_get_response_rate, we cannot
 825                  * have more than 32 legacy rates.
 826                  */
 827                 if (WARN_ON(sband->n_bitrates > 32))
 828                         return -EINVAL;
 829
 830                 for (i = 0; i < sband->n_channels; i++) {
 831                         sband->channels[i].orig_flags =
 832                                 sband->channels[i].flags;
 833                         sband->channels[i].orig_mag = INT_MAX;
 834                         sband->channels[i].orig_mpwr =
 835                                 sband->channels[i].max_power;
 836                         sband->channels[i].band = band;
 837                 }
 838
 839                 for (i = 0; i < sband->n_iftype_data; i++) {
 840                         const struct ieee80211_sband_iftype_data *iftd;
 841
 842                         iftd = &sband->iftype_data[i];
 843
 844                         if (WARN_ON(!iftd->types_mask))
 845                                 return -EINVAL;
 846                         if (WARN_ON(types & iftd->types_mask))
 847                                 return -EINVAL;
 848
 849                         /* at least one piece of information must be present */
 850                         if (WARN_ON(!iftd->he_cap.has_he))
 851                                 return -EINVAL;
 852
 853                         types |= iftd->types_mask;
 854                 }
 855
 856                 have_band = true;
 857         }
 858
 859         if (!have_band) {
 860                 WARN_ON(1);
 861                 return -EINVAL;
 862         }
 863
 864         for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
 865                 /*
 866                  * Validate we have a policy (can be explicitly set to
 867                  * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
 868                  * we have at least one of doit/dumpit.
 869                  */
 870                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
 871                         return -EINVAL;
 872                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
 873                             !rdev->wiphy.vendor_commands[i].dumpit))
 874                         return -EINVAL;
 875         }
 876
 877 #ifdef CONFIG_PM
 878         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 879                     (!rdev->wiphy.wowlan->pattern_min_len ||
 880                      rdev->wiphy.wowlan->pattern_min_len >
 881                                 rdev->wiphy.wowlan->pattern_max_len)))
 882                 return -EINVAL;
 883 #endif
 884
 885         /* check and set up bitrates */
 886         ieee80211_set_bitrate_flags(wiphy);
 887
 888         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 889
 890         rtnl_lock();
 891         res = device_add(&rdev->wiphy.dev);
 892         if (res) {
 893                 rtnl_unlock();
 894                 return res;
 895         }
 896
 897         /* set up regulatory info */
 898         wiphy_regulatory_register(wiphy);
 899
 900         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 901         cfg80211_rdev_list_generation++;
 902
 903         /* add to debugfs */
 904         rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
 905                                                     ieee80211_debugfs_dir);
 906
 907         cfg80211_debugfs_rdev_add(rdev);
 908         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 909
 910         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 911                 struct regulatory_request request;
 912
 913                 request.wiphy_idx = get_wiphy_idx(wiphy);
 914                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 915                 request.alpha2[0] = '9';
 916                 request.alpha2[1] = '9';
 917
 918                 nl80211_send_reg_change_event(&request);
 919         }
 920
 921         /* Check that nobody globally advertises any capabilities they do not
 922          * advertise on all possible interface types.
 923          */
 924         if (wiphy->extended_capabilities_len &&
 925             wiphy->num_iftype_ext_capab &&
 926             wiphy->iftype_ext_capab) {
 927                 u8 supported_on_all, j;
 928                 const struct wiphy_iftype_ext_capab *capab;
 929
 930                 capab = wiphy->iftype_ext_capab;
 931                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
 932                         if (capab[0].extended_capabilities_len > j)
 933                                 supported_on_all =
 934                                         capab[0].extended_capabilities[j];
 935                         else
 936                                 supported_on_all = 0x00;
 937                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
 938                                 if (j >= capab[i].extended_capabilities_len) {
 939                                         supported_on_all = 0x00;
 940                                         break;
 941                                 }
 942                                 supported_on_all &=
 943                                         capab[i].extended_capabilities[j];
 944                         }
 945                         if (WARN_ON(wiphy->extended_capabilities[j] &
 946                                     ~supported_on_all))
 947                                 break;
 948                 }
 949         }
 950
 951         rdev->wiphy.registered = true;
 952         rtnl_unlock();
 953
 954         res = rfkill_register(rdev->rfkill);
 955         if (res) {
 956                 rfkill_destroy(rdev->rfkill);
 957                 rdev->rfkill = NULL;
 958                 wiphy_unregister(&rdev->wiphy);
 959                 return res;
 960         }
 961
 962         return 0;
 963 }
 964 EXPORT_SYMBOL(wiphy_register);
 965
 966 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 967 {
 968         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 969
 970         if (!rdev->ops->rfkill_poll)
 971                 return;
 972         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 973         rfkill_resume_polling(rdev->rfkill);
 974 }
 975 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 976
 977 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 978 {
 979         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 980
 981         rfkill_pause_polling(rdev->rfkill);
 982 }
 983 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 984
 985 void wiphy_unregister(struct wiphy *wiphy)
 986 {
 987         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 988
 989         wait_event(rdev->dev_wait, ({
 990                 int __count;
 991                 rtnl_lock();
 992                 __count = rdev->opencount;
 993                 rtnl_unlock();
 994                 __count == 0; }));
 995
 996         if (rdev->rfkill)
 997                 rfkill_unregister(rdev->rfkill);
 998
 999         rtnl_lock();
1000         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1001         rdev->wiphy.registered = false;
1002
1003         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1004
1005         /*
1006          * First remove the hardware from everywhere, this makes
1007          * it impossible to find from userspace.
1008          */
1009         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1010         list_del_rcu(&rdev->list);
1011         synchronize_rcu();
1012
1013         /*
1014          * If this device got a regulatory hint tell core its
1015          * free to listen now to a new shiny device regulatory hint
1016          */
1017         wiphy_regulatory_deregister(wiphy);
1018
1019         cfg80211_rdev_list_generation++;
1020         device_del(&rdev->wiphy.dev);
1021
1022         rtnl_unlock();
1023
1024         flush_work(&rdev->scan_done_wk);
1025         cancel_work_sync(&rdev->conn_work);
1026         flush_work(&rdev->event_work);
1027         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1028         flush_work(&rdev->destroy_work);
1029         flush_work(&rdev->sched_scan_stop_wk);
1030         flush_work(&rdev->propagate_radar_detect_wk);
1031         flush_work(&rdev->propagate_cac_done_wk);
1032
1033 #ifdef CONFIG_PM
1034         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1035                 rdev_set_wakeup(rdev, false);
1036 #endif
1037         cfg80211_rdev_free_wowlan(rdev);
1038         cfg80211_rdev_free_coalesce(rdev);
1039 }
1040 EXPORT_SYMBOL(wiphy_unregister);
1041
1042 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1043 {
1044         struct cfg80211_internal_bss *scan, *tmp;
1045         struct cfg80211_beacon_registration *reg, *treg;
1046         rfkill_destroy(rdev->rfkill);
1047         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1048                 list_del(&reg->list);
1049                 kfree(reg);
1050         }
1051         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1052                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1053         kfree(rdev);
1054 }
1055
1056 void wiphy_free(struct wiphy *wiphy)
1057 {
1058         put_device(&wiphy->dev);
1059 }
1060 EXPORT_SYMBOL(wiphy_free);
1061
1062 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
1063 {
1064         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1065
1066         if (rfkill_set_hw_state(rdev->rfkill, blocked))
1067                 schedule_work(&rdev->rfkill_block);
1068 }
1069 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
1070
1071 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1072 {
1073         kfree(wdev->cqm_config);
1074         wdev->cqm_config = NULL;
1075 }
1076
1077 static void __cfg80211_unregister_wdev(struct wireless_dev *wdev, bool sync)
1078 {
1079         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1080
1081         ASSERT_RTNL();
1082
1083         flush_work(&wdev->pmsr_free_wk);
1084
1085         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1086
1087         list_del_rcu(&wdev->list);
1088         if (sync)
1089                 synchronize_rcu();
1090         rdev->devlist_generation++;
1091
1092         cfg80211_mlme_purge_registrations(wdev);
1093         flush_work(&wdev->mgmt_registrations_update_wk);
1094
1095         switch (wdev->iftype) {
1096         case NL80211_IFTYPE_P2P_DEVICE:
1097                 cfg80211_stop_p2p_device(rdev, wdev);
1098                 break;
1099         case NL80211_IFTYPE_NAN:
1100                 cfg80211_stop_nan(rdev, wdev);
1101                 break;
1102         default:
1103                 break;
1104         }
1105
1106 #ifdef CONFIG_CFG80211_WEXT
1107         kzfree(wdev->wext.keys);
1108         wdev->wext.keys = NULL;
1109 #endif
1110         /* only initialized if we have a netdev */
1111         if (wdev->netdev)
1112                 flush_work(&wdev->disconnect_wk);
1113
1114         cfg80211_cqm_config_free(wdev);
1115 }
1116
1117 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1118 {
1119         if (WARN_ON(wdev->netdev))
1120                 return;
1121
1122         __cfg80211_unregister_wdev(wdev, true);
1123 }
1124 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1125
1126 static const struct device_type wiphy_type = {
1127         .name   = "wlan",
1128 };
1129
1130 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1131                                enum nl80211_iftype iftype, int num)
1132 {
1133         ASSERT_RTNL();
1134
1135         rdev->num_running_ifaces += num;
1136         if (iftype == NL80211_IFTYPE_MONITOR)
1137                 rdev->num_running_monitor_ifaces += num;
1138 }
1139
1140 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1141                       struct wireless_dev *wdev)
1142 {
1143         struct net_device *dev = wdev->netdev;
1144         struct cfg80211_sched_scan_request *pos, *tmp;
1145
1146         ASSERT_RTNL();
1147         ASSERT_WDEV_LOCK(wdev);
1148
1149         cfg80211_pmsr_wdev_down(wdev);
1150
1151         switch (wdev->iftype) {
1152         case NL80211_IFTYPE_ADHOC:
1153                 __cfg80211_leave_ibss(rdev, dev, true);
1154                 break;
1155         case NL80211_IFTYPE_P2P_CLIENT:
1156         case NL80211_IFTYPE_STATION:
1157                 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1158                                          list) {
1159                         if (dev == pos->dev)
1160                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1161                 }
1162
1163 #ifdef CONFIG_CFG80211_WEXT
1164                 kfree(wdev->wext.ie);
1165                 wdev->wext.ie = NULL;
1166                 wdev->wext.ie_len = 0;
1167                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1168 #endif
1169                 cfg80211_disconnect(rdev, dev,
1170                                     WLAN_REASON_DEAUTH_LEAVING, true);
1171                 break;
1172         case NL80211_IFTYPE_MESH_POINT:
1173                 __cfg80211_leave_mesh(rdev, dev);
1174                 break;
1175         case NL80211_IFTYPE_AP:
1176         case NL80211_IFTYPE_P2P_GO:
1177                 __cfg80211_stop_ap(rdev, dev, true);
1178                 break;
1179         case NL80211_IFTYPE_OCB:
1180                 __cfg80211_leave_ocb(rdev, dev);
1181                 break;
1182         case NL80211_IFTYPE_WDS:
1183                 /* must be handled by mac80211/driver, has no APIs */
1184                 break;
1185         case NL80211_IFTYPE_P2P_DEVICE:
1186         case NL80211_IFTYPE_NAN:
1187                 /* cannot happen, has no netdev */
1188                 break;
1189         case NL80211_IFTYPE_AP_VLAN:
1190         case NL80211_IFTYPE_MONITOR:
1191                 /* nothing to do */
1192                 break;
1193         case NL80211_IFTYPE_UNSPECIFIED:
1194         case NUM_NL80211_IFTYPES:
1195                 /* invalid */
1196                 break;
1197         }
1198 }
1199
1200 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1201                     struct wireless_dev *wdev)
1202 {
1203         wdev_lock(wdev);
1204         __cfg80211_leave(rdev, wdev);
1205         wdev_unlock(wdev);
1206 }
1207
1208 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1209                          gfp_t gfp)
1210 {
1211         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1212         struct cfg80211_event *ev;
1213         unsigned long flags;
1214
1215         trace_cfg80211_stop_iface(wiphy, wdev);
1216
1217         ev = kzalloc(sizeof(*ev), gfp);
1218         if (!ev)
1219                 return;
1220
1221         ev->type = EVENT_STOPPED;
1222
1223         spin_lock_irqsave(&wdev->event_lock, flags);
1224         list_add_tail(&ev->list, &wdev->event_list);
1225         spin_unlock_irqrestore(&wdev->event_lock, flags);
1226         queue_work(cfg80211_wq, &rdev->event_work);
1227 }
1228 EXPORT_SYMBOL(cfg80211_stop_iface);
1229
1230 void cfg80211_init_wdev(struct cfg80211_registered_device *rdev,
1231                         struct wireless_dev *wdev)
1232 {
1233         mutex_init(&wdev->mtx);
1234         INIT_LIST_HEAD(&wdev->event_list);
1235         spin_lock_init(&wdev->event_lock);
1236         INIT_LIST_HEAD(&wdev->mgmt_registrations);
1237         spin_lock_init(&wdev->mgmt_registrations_lock);
1238         INIT_WORK(&wdev->mgmt_registrations_update_wk,
1239                   cfg80211_mgmt_registrations_update_wk);
1240         INIT_LIST_HEAD(&wdev->pmsr_list);
1241         spin_lock_init(&wdev->pmsr_lock);
1242         INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1243
1244         /*
1245          * We get here also when the interface changes network namespaces,
1246          * as it's registered into the new one, but we don't want it to
1247          * change ID in that case. Checking if the ID is already assigned
1248          * works, because 0 isn't considered a valid ID and the memory is
1249          * 0-initialized.
1250          */
1251         if (!wdev->identifier)
1252                 wdev->identifier = ++rdev->wdev_id;
1253         list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1254         rdev->devlist_generation++;
1255
1256         nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1257 }
1258
1259 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1260                                          unsigned long state, void *ptr)
1261 {
1262         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1263         struct wireless_dev *wdev = dev->ieee80211_ptr;
1264         struct cfg80211_registered_device *rdev;
1265         struct cfg80211_sched_scan_request *pos, *tmp;
1266
1267         if (!wdev)
1268                 return NOTIFY_DONE;
1269
1270         rdev = wiphy_to_rdev(wdev->wiphy);
1271
1272         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1273
1274         switch (state) {
1275         case NETDEV_POST_INIT:
1276                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1277                 break;
1278         case NETDEV_REGISTER:
1279                 /*
1280                  * NB: cannot take rdev->mtx here because this may be
1281                  * called within code protected by it when interfaces
1282                  * are added with nl80211.
1283                  */
1284                 /* can only change netns with wiphy */
1285                 dev->features |= NETIF_F_NETNS_LOCAL;
1286
1287                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1288                                       "phy80211")) {
1289                         pr_err("failed to add phy80211 symlink to netdev!\n");
1290                 }
1291                 wdev->netdev = dev;
1292 #ifdef CONFIG_CFG80211_WEXT
1293                 wdev->wext.default_key = -1;
1294                 wdev->wext.default_mgmt_key = -1;
1295                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1296 #endif
1297
1298                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1299                         wdev->ps = true;
1300                 else
1301                         wdev->ps = false;
1302                 /* allow mac80211 to determine the timeout */
1303                 wdev->ps_timeout = -1;
1304
1305                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1306                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1307                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1308                         dev->priv_flags |= IFF_DONT_BRIDGE;
1309
1310                 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1311
1312                 cfg80211_init_wdev(rdev, wdev);
1313                 break;
1314         case NETDEV_GOING_DOWN:
1315                 cfg80211_leave(rdev, wdev);
1316                 break;
1317         case NETDEV_DOWN:
1318                 cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1319                 if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1320                         if (WARN_ON(!rdev->scan_req->notified))
1321                                 rdev->scan_req->info.aborted = true;
1322                         ___cfg80211_scan_done(rdev, false);
1323                 }
1324
1325                 list_for_each_entry_safe(pos, tmp,
1326                                          &rdev->sched_scan_req_list, list) {
1327                         if (WARN_ON(pos->dev == wdev->netdev))
1328                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1329                 }
1330
1331                 rdev->opencount--;
1332                 wake_up(&rdev->dev_wait);
1333                 break;
1334         case NETDEV_UP:
1335                 cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1336                 wdev_lock(wdev);
1337                 switch (wdev->iftype) {
1338 #ifdef CONFIG_CFG80211_WEXT
1339                 case NL80211_IFTYPE_ADHOC:
1340                         cfg80211_ibss_wext_join(rdev, wdev);
1341                         break;
1342                 case NL80211_IFTYPE_STATION:
1343                         cfg80211_mgd_wext_connect(rdev, wdev);
1344                         break;
1345 #endif
1346 #ifdef CONFIG_MAC80211_MESH
1347                 case NL80211_IFTYPE_MESH_POINT:
1348                         {
1349                                 /* backward compat code... */
1350                                 struct mesh_setup setup;
1351                                 memcpy(&setup, &default_mesh_setup,
1352                                                 sizeof(setup));
1353                                  /* back compat only needed for mesh_id */
1354                                 setup.mesh_id = wdev->ssid;
1355                                 setup.mesh_id_len = wdev->mesh_id_up_len;
1356                                 if (wdev->mesh_id_up_len)
1357                                         __cfg80211_join_mesh(rdev, dev,
1358                                                         &setup,
1359                                                         &default_mesh_config);
1360                                 break;
1361                         }
1362 #endif
1363                 default:
1364                         break;
1365                 }
1366                 wdev_unlock(wdev);
1367                 rdev->opencount++;
1368
1369                 /*
1370                  * Configure power management to the driver here so that its
1371                  * correctly set also after interface type changes etc.
1372                  */
1373                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1374                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1375                     rdev->ops->set_power_mgmt &&
1376                     rdev_set_power_mgmt(rdev, dev, wdev->ps,
1377                                         wdev->ps_timeout)) {
1378                         /* assume this means it's off */
1379                         wdev->ps = false;
1380                 }
1381                 break;
1382         case NETDEV_UNREGISTER:
1383                 /*
1384                  * It is possible to get NETDEV_UNREGISTER
1385                  * multiple times. To detect that, check
1386                  * that the interface is still on the list
1387                  * of registered interfaces, and only then
1388                  * remove and clean it up.
1389                  */
1390                 if (!list_empty(&wdev->list)) {
1391                         __cfg80211_unregister_wdev(wdev, false);
1392                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
1393                 }
1394                 /*
1395                  * synchronise (so that we won't find this netdev
1396                  * from other code any more) and then clear the list
1397                  * head so that the above code can safely check for
1398                  * !list_empty() to avoid double-cleanup.
1399                  */
1400                 synchronize_rcu();
1401                 INIT_LIST_HEAD(&wdev->list);
1402                 /*
1403                  * Ensure that all events have been processed and
1404                  * freed.
1405                  */
1406                 cfg80211_process_wdev_events(wdev);
1407
1408                 if (WARN_ON(wdev->current_bss)) {
1409                         cfg80211_unhold_bss(wdev->current_bss);
1410                         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1411                         wdev->current_bss = NULL;
1412                 }
1413                 break;
1414         case NETDEV_PRE_UP:
1415                 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1416                                              wdev->use_4addr, 0))
1417                         return notifier_from_errno(-EOPNOTSUPP);
1418
1419                 if (rfkill_blocked(rdev->rfkill))
1420                         return notifier_from_errno(-ERFKILL);
1421                 break;
1422         default:
1423                 return NOTIFY_DONE;
1424         }
1425
1426         wireless_nlevent_flush();
1427
1428         return NOTIFY_OK;
1429 }
1430
1431 static struct notifier_block cfg80211_netdev_notifier = {
1432         .notifier_call = cfg80211_netdev_notifier_call,
1433 };
1434
1435 static void __net_exit cfg80211_pernet_exit(struct net *net)
1436 {
1437         struct cfg80211_registered_device *rdev;
1438
1439         rtnl_lock();
1440         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1441                 if (net_eq(wiphy_net(&rdev->wiphy), net))
1442                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1443         }
1444         rtnl_unlock();
1445 }
1446
1447 static struct pernet_operations cfg80211_pernet_ops = {
1448         .exit = cfg80211_pernet_exit,
1449 };
1450
1451 static int __init cfg80211_init(void)
1452 {
1453         int err;
1454
1455         err = register_pernet_device(&cfg80211_pernet_ops);
1456         if (err)
1457                 goto out_fail_pernet;
1458
1459         err = wiphy_sysfs_init();
1460         if (err)
1461                 goto out_fail_sysfs;
1462
1463         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1464         if (err)
1465                 goto out_fail_notifier;
1466
1467         err = nl80211_init();
1468         if (err)
1469                 goto out_fail_nl80211;
1470
1471         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1472
1473         err = regulatory_init();
1474         if (err)
1475                 goto out_fail_reg;
1476
1477         cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1478         if (!cfg80211_wq) {
1479                 err = -ENOMEM;
1480                 goto out_fail_wq;
1481         }
1482
1483         return 0;
1484
1485 out_fail_wq:
1486         regulatory_exit();
1487 out_fail_reg:
1488         debugfs_remove(ieee80211_debugfs_dir);
1489         nl80211_exit();
1490 out_fail_nl80211:
1491         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1492 out_fail_notifier:
1493         wiphy_sysfs_exit();
1494 out_fail_sysfs:
1495         unregister_pernet_device(&cfg80211_pernet_ops);
1496 out_fail_pernet:
1497         return err;
1498 }
1499 fs_initcall(cfg80211_init);
1500
1501 static void __exit cfg80211_exit(void)
1502 {
1503         debugfs_remove(ieee80211_debugfs_dir);
1504         nl80211_exit();
1505         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1506         wiphy_sysfs_exit();
1507         regulatory_exit();
1508         unregister_pernet_device(&cfg80211_pernet_ops);
1509         destroy_workqueue(cfg80211_wq);
1510 }
1511 module_exit(cfg80211_exit);