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) 2018-2021 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_LIST_HEAD(&rdev->mlme_unreg);
 484         spin_lock_init(&rdev->mlme_unreg_lock);
 485         INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
 486         INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 487                           cfg80211_dfs_channels_update_work);
 488 #ifdef CONFIG_CFG80211_WEXT
 489         rdev->wiphy.wext = &cfg80211_wext_handler;
 490 #endif
 491
 492         device_initialize(&rdev->wiphy.dev);
 493         rdev->wiphy.dev.class = &ieee80211_class;
 494         rdev->wiphy.dev.platform_data = rdev;
 495         device_enable_async_suspend(&rdev->wiphy.dev);
 496
 497         INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 498         INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 499         INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
 500         INIT_WORK(&rdev->propagate_radar_detect_wk,
 501                   cfg80211_propagate_radar_detect_wk);
 502         INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
 503
 504 #ifdef CONFIG_CFG80211_DEFAULT_PS
 505         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 506 #endif
 507
 508         wiphy_net_set(&rdev->wiphy, &init_net);
 509
 510         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 511         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 512                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 513                                    &rdev->rfkill_ops, rdev);
 514
 515         if (!rdev->rfkill) {
 516                 wiphy_free(&rdev->wiphy);
 517                 return NULL;
 518         }
 519
 520         INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
 521         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 522         INIT_WORK(&rdev->event_work, cfg80211_event_work);
 523
 524         init_waitqueue_head(&rdev->dev_wait);
 525
 526         /*
 527          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 528          * Fragmentation and RTS threshold are disabled by default with the
 529          * special -1 value.
 530          */
 531         rdev->wiphy.retry_short = 7;
 532         rdev->wiphy.retry_long = 4;
 533         rdev->wiphy.frag_threshold = (u32) -1;
 534         rdev->wiphy.rts_threshold = (u32) -1;
 535         rdev->wiphy.coverage_class = 0;
 536
 537         rdev->wiphy.max_num_csa_counters = 1;
 538
 539         rdev->wiphy.max_sched_scan_plans = 1;
 540         rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 541
 542         return &rdev->wiphy;
 543 }
 544 EXPORT_SYMBOL(wiphy_new_nm);
 545
 546 static int wiphy_verify_combinations(struct wiphy *wiphy)
 547 {
 548         const struct ieee80211_iface_combination *c;
 549         int i, j;
 550
 551         for (i = 0; i < wiphy->n_iface_combinations; i++) {
 552                 u32 cnt = 0;
 553                 u16 all_iftypes = 0;
 554
 555                 c = &wiphy->iface_combinations[i];
 556
 557                 /*
 558                  * Combinations with just one interface aren't real,
 559                  * however we make an exception for DFS.
 560                  */
 561                 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 562                         return -EINVAL;
 563
 564                 /* Need at least one channel */
 565                 if (WARN_ON(!c->num_different_channels))
 566                         return -EINVAL;
 567
 568                 /*
 569                  * Put a sane limit on maximum number of different
 570                  * channels to simplify channel accounting code.
 571                  */
 572                 if (WARN_ON(c->num_different_channels >
 573                                 CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
 574                         return -EINVAL;
 575
 576                 /* DFS only works on one channel. */
 577                 if (WARN_ON(c->radar_detect_widths &&
 578                             (c->num_different_channels > 1)))
 579                         return -EINVAL;
 580
 581                 if (WARN_ON(!c->n_limits))
 582                         return -EINVAL;
 583
 584                 for (j = 0; j < c->n_limits; j++) {
 585                         u16 types = c->limits[j].types;
 586
 587                         /* interface types shouldn't overlap */
 588                         if (WARN_ON(types & all_iftypes))
 589                                 return -EINVAL;
 590                         all_iftypes |= types;
 591
 592                         if (WARN_ON(!c->limits[j].max))
 593                                 return -EINVAL;
 594
 595                         /* Shouldn't list software iftypes in combinations! */
 596                         if (WARN_ON(wiphy->software_iftypes & types))
 597                                 return -EINVAL;
 598
 599                         /* Only a single P2P_DEVICE can be allowed */
 600                         if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 601                                     c->limits[j].max > 1))
 602                                 return -EINVAL;
 603
 604                         /* Only a single NAN can be allowed */
 605                         if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
 606                                     c->limits[j].max > 1))
 607                                 return -EINVAL;
 608
 609                         /*
 610                          * This isn't well-defined right now. If you have an
 611                          * IBSS interface, then its beacon interval may change
 612                          * by joining other networks, and nothing prevents it
 613                          * from doing that.
 614                          * So technically we probably shouldn't even allow AP
 615                          * and IBSS in the same interface, but it seems that
 616                          * some drivers support that, possibly only with fixed
 617                          * beacon intervals for IBSS.
 618                          */
 619                         if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
 620                                     c->beacon_int_min_gcd)) {
 621                                 return -EINVAL;
 622                         }
 623
 624                         cnt += c->limits[j].max;
 625                         /*
 626                          * Don't advertise an unsupported type
 627                          * in a combination.
 628                          */
 629                         if (WARN_ON((wiphy->interface_modes & types) != types))
 630                                 return -EINVAL;
 631                 }
 632
 633 #ifndef CONFIG_WIRELESS_WDS
 634                 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
 635                         return -EINVAL;
 636 #endif
 637
 638                 /* You can't even choose that many! */
 639                 if (WARN_ON(cnt < c->max_interfaces))
 640                         return -EINVAL;
 641         }
 642
 643         return 0;
 644 }
 645
 646 int wiphy_register(struct wiphy *wiphy)
 647 {
 648         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 649         int res;
 650         enum nl80211_band band;
 651         struct ieee80211_supported_band *sband;
 652         bool have_band = false;
 653         int i;
 654         u16 ifmodes = wiphy->interface_modes;
 655
 656 #ifdef CONFIG_PM
 657         if (WARN_ON(wiphy->wowlan &&
 658                     (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 659                     !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 660                 return -EINVAL;
 661         if (WARN_ON(wiphy->wowlan &&
 662                     !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 663                     !wiphy->wowlan->tcp))
 664                 return -EINVAL;
 665 #endif
 666         if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 667                     (!rdev->ops->tdls_channel_switch ||
 668                      !rdev->ops->tdls_cancel_channel_switch)))
 669                 return -EINVAL;
 670
 671         if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
 672                     (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
 673                      !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
 674                      !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
 675                 return -EINVAL;
 676
 677 #ifndef CONFIG_WIRELESS_WDS
 678         if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
 679                 return -EINVAL;
 680 #endif
 681
 682         if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
 683                 return -EINVAL;
 684
 685         if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
 686                 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
 687                             !wiphy->pmsr_capa->ftm.non_asap))
 688                         return -EINVAL;
 689                 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
 690                             !wiphy->pmsr_capa->ftm.bandwidths))
 691                         return -EINVAL;
 692                 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
 693                                 ~(BIT(NL80211_PREAMBLE_LEGACY) |
 694                                   BIT(NL80211_PREAMBLE_HT) |
 695                                   BIT(NL80211_PREAMBLE_VHT) |
 696                                   BIT(NL80211_PREAMBLE_DMG))))
 697                         return -EINVAL;
 698                 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
 699                                 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
 700                                   BIT(NL80211_CHAN_WIDTH_20) |
 701                                   BIT(NL80211_CHAN_WIDTH_40) |
 702                                   BIT(NL80211_CHAN_WIDTH_80) |
 703                                   BIT(NL80211_CHAN_WIDTH_80P80) |
 704                                   BIT(NL80211_CHAN_WIDTH_160) |
 705                                   BIT(NL80211_CHAN_WIDTH_5) |
 706                                   BIT(NL80211_CHAN_WIDTH_10))))
 707                         return -EINVAL;
 708         }
 709
 710         /*
 711          * if a wiphy has unsupported modes for regulatory channel enforcement,
 712          * opt-out of enforcement checking
 713          */
 714         if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
 715                                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
 716                                        BIT(NL80211_IFTYPE_AP) |
 717                                        BIT(NL80211_IFTYPE_P2P_GO) |
 718                                        BIT(NL80211_IFTYPE_ADHOC) |
 719                                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
 720                                        BIT(NL80211_IFTYPE_NAN) |
 721                                        BIT(NL80211_IFTYPE_AP_VLAN) |
 722                                        BIT(NL80211_IFTYPE_MONITOR)))
 723                 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
 724
 725         if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 726                     (wiphy->regulatory_flags &
 727                                         (REGULATORY_CUSTOM_REG |
 728                                          REGULATORY_STRICT_REG |
 729                                          REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 730                                          REGULATORY_COUNTRY_IE_IGNORE))))
 731                 return -EINVAL;
 732
 733         if (WARN_ON(wiphy->coalesce &&
 734                     (!wiphy->coalesce->n_rules ||
 735                      !wiphy->coalesce->n_patterns) &&
 736                     (!wiphy->coalesce->pattern_min_len ||
 737                      wiphy->coalesce->pattern_min_len >
 738                         wiphy->coalesce->pattern_max_len)))
 739                 return -EINVAL;
 740
 741         if (WARN_ON(wiphy->ap_sme_capa &&
 742                     !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 743                 return -EINVAL;
 744
 745         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 746                 return -EINVAL;
 747
 748         if (WARN_ON(wiphy->addresses &&
 749                     !is_zero_ether_addr(wiphy->perm_addr) &&
 750                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 751                            ETH_ALEN)))
 752                 return -EINVAL;
 753
 754         if (WARN_ON(wiphy->max_acl_mac_addrs &&
 755                     (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 756                      !rdev->ops->set_mac_acl)))
 757                 return -EINVAL;
 758
 759         /* assure only valid behaviours are flagged by driver
 760          * hence subtract 2 as bit 0 is invalid.
 761          */
 762         if (WARN_ON(wiphy->bss_select_support &&
 763                     (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 764                 return -EINVAL;
 765
 766         if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
 767                                             NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
 768                     (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
 769                 return -EINVAL;
 770
 771         if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
 772                     rdev->ops->update_connect_params))
 773                 return -EINVAL;
 774
 775         if (wiphy->addresses)
 776                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 777
 778         /* sanity check ifmodes */
 779         WARN_ON(!ifmodes);
 780         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 781         if (WARN_ON(ifmodes != wiphy->interface_modes))
 782                 wiphy->interface_modes = ifmodes;
 783
 784         res = wiphy_verify_combinations(wiphy);
 785         if (res)
 786                 return res;
 787
 788         /* sanity check supported bands/channels */
 789         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 790                 u16 types = 0;
 791
 792                 sband = wiphy->bands[band];
 793                 if (!sband)
 794                         continue;
 795
 796                 sband->band = band;
 797                 if (WARN_ON(!sband->n_channels))
 798                         return -EINVAL;
 799                 /*
 800                  * on 60GHz band, there are no legacy rates, so
 801                  * n_bitrates is 0
 802                  */
 803                 if (WARN_ON(band != NL80211_BAND_60GHZ &&
 804                             !sband->n_bitrates))
 805                         return -EINVAL;
 806
 807                 /*
 808                  * Since cfg80211_disable_40mhz_24ghz is global, we can
 809                  * modify the sband's ht data even if the driver uses a
 810                  * global structure for that.
 811                  */
 812                 if (cfg80211_disable_40mhz_24ghz &&
 813                     band == NL80211_BAND_2GHZ &&
 814                     sband->ht_cap.ht_supported) {
 815                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 816                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 817                 }
 818
 819                 /*
 820                  * Since we use a u32 for rate bitmaps in
 821                  * ieee80211_get_response_rate, we cannot
 822                  * have more than 32 legacy rates.
 823                  */
 824                 if (WARN_ON(sband->n_bitrates > 32))
 825                         return -EINVAL;
 826
 827                 for (i = 0; i < sband->n_channels; i++) {
 828                         sband->channels[i].orig_flags =
 829                                 sband->channels[i].flags;
 830                         sband->channels[i].orig_mag = INT_MAX;
 831                         sband->channels[i].orig_mpwr =
 832                                 sband->channels[i].max_power;
 833                         sband->channels[i].band = band;
 834                 }
 835
 836                 for (i = 0; i < sband->n_iftype_data; i++) {
 837                         const struct ieee80211_sband_iftype_data *iftd;
 838
 839                         iftd = &sband->iftype_data[i];
 840
 841                         if (WARN_ON(!iftd->types_mask))
 842                                 return -EINVAL;
 843                         if (WARN_ON(types & iftd->types_mask))
 844                                 return -EINVAL;
 845
 846                         /* at least one piece of information must be present */
 847                         if (WARN_ON(!iftd->he_cap.has_he))
 848                                 return -EINVAL;
 849
 850                         types |= iftd->types_mask;
 851                 }
 852
 853                 have_band = true;
 854         }
 855
 856         if (!have_band) {
 857                 WARN_ON(1);
 858                 return -EINVAL;
 859         }
 860
 861         for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
 862                 /*
 863                  * Validate we have a policy (can be explicitly set to
 864                  * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
 865                  * we have at least one of doit/dumpit.
 866                  */
 867                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
 868                         return -EINVAL;
 869                 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
 870                             !rdev->wiphy.vendor_commands[i].dumpit))
 871                         return -EINVAL;
 872         }
 873
 874 #ifdef CONFIG_PM
 875         if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 876                     (!rdev->wiphy.wowlan->pattern_min_len ||
 877                      rdev->wiphy.wowlan->pattern_min_len >
 878                                 rdev->wiphy.wowlan->pattern_max_len)))
 879                 return -EINVAL;
 880 #endif
 881
 882         /* check and set up bitrates */
 883         ieee80211_set_bitrate_flags(wiphy);
 884
 885         rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 886
 887         rtnl_lock();
 888         res = device_add(&rdev->wiphy.dev);
 889         if (res) {
 890                 rtnl_unlock();
 891                 return res;
 892         }
 893
 894         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 895         cfg80211_rdev_list_generation++;
 896
 897         /* add to debugfs */
 898         rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
 899                                                     ieee80211_debugfs_dir);
 900
 901         cfg80211_debugfs_rdev_add(rdev);
 902         nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 903
 904         /* set up regulatory info */
 905         wiphy_regulatory_register(wiphy);
 906
 907         if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 908                 struct regulatory_request request;
 909
 910                 request.wiphy_idx = get_wiphy_idx(wiphy);
 911                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 912                 request.alpha2[0] = '9';
 913                 request.alpha2[1] = '9';
 914
 915                 nl80211_send_reg_change_event(&request);
 916         }
 917
 918         /* Check that nobody globally advertises any capabilities they do not
 919          * advertise on all possible interface types.
 920          */
 921         if (wiphy->extended_capabilities_len &&
 922             wiphy->num_iftype_ext_capab &&
 923             wiphy->iftype_ext_capab) {
 924                 u8 supported_on_all, j;
 925                 const struct wiphy_iftype_ext_capab *capab;
 926
 927                 capab = wiphy->iftype_ext_capab;
 928                 for (j = 0; j < wiphy->extended_capabilities_len; j++) {
 929                         if (capab[0].extended_capabilities_len > j)
 930                                 supported_on_all =
 931                                         capab[0].extended_capabilities[j];
 932                         else
 933                                 supported_on_all = 0x00;
 934                         for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
 935                                 if (j >= capab[i].extended_capabilities_len) {
 936                                         supported_on_all = 0x00;
 937                                         break;
 938                                 }
 939                                 supported_on_all &=
 940                                         capab[i].extended_capabilities[j];
 941                         }
 942                         if (WARN_ON(wiphy->extended_capabilities[j] &
 943                                     ~supported_on_all))
 944                                 break;
 945                 }
 946         }
 947
 948         rdev->wiphy.registered = true;
 949         rtnl_unlock();
 950
 951         res = rfkill_register(rdev->rfkill);
 952         if (res) {
 953                 rfkill_destroy(rdev->rfkill);
 954                 rdev->rfkill = NULL;
 955                 wiphy_unregister(&rdev->wiphy);
 956                 return res;
 957         }
 958
 959         return 0;
 960 }
 961 EXPORT_SYMBOL(wiphy_register);
 962
 963 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
 964 {
 965         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 966
 967         if (!rdev->ops->rfkill_poll)
 968                 return;
 969         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
 970         rfkill_resume_polling(rdev->rfkill);
 971 }
 972 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
 973
 974 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
 975 {
 976         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 977
 978         rfkill_pause_polling(rdev->rfkill);
 979 }
 980 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
 981
 982 void wiphy_unregister(struct wiphy *wiphy)
 983 {
 984         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 985
 986         wait_event(rdev->dev_wait, ({
 987                 int __count;
 988                 rtnl_lock();
 989                 __count = rdev->opencount;
 990                 rtnl_unlock();
 991                 __count == 0; }));
 992
 993         if (rdev->rfkill)
 994                 rfkill_unregister(rdev->rfkill);
 995
 996         rtnl_lock();
 997         nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 998         rdev->wiphy.registered = false;
 999
1000         WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1001
1002         /*
1003          * First remove the hardware from everywhere, this makes
1004          * it impossible to find from userspace.
1005          */
1006         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1007         list_del_rcu(&rdev->list);
1008         synchronize_rcu();
1009
1010         /*
1011          * If this device got a regulatory hint tell core its
1012          * free to listen now to a new shiny device regulatory hint
1013          */
1014         wiphy_regulatory_deregister(wiphy);
1015
1016         cfg80211_rdev_list_generation++;
1017         device_del(&rdev->wiphy.dev);
1018
1019         rtnl_unlock();
1020
1021         flush_work(&rdev->scan_done_wk);
1022         cancel_work_sync(&rdev->conn_work);
1023         flush_work(&rdev->event_work);
1024         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1025         flush_work(&rdev->destroy_work);
1026         flush_work(&rdev->sched_scan_stop_wk);
1027         flush_work(&rdev->mlme_unreg_wk);
1028         flush_work(&rdev->propagate_radar_detect_wk);
1029         flush_work(&rdev->propagate_cac_done_wk);
1030
1031 #ifdef CONFIG_PM
1032         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1033                 rdev_set_wakeup(rdev, false);
1034 #endif
1035         cfg80211_rdev_free_wowlan(rdev);
1036         cfg80211_rdev_free_coalesce(rdev);
1037 }
1038 EXPORT_SYMBOL(wiphy_unregister);
1039
1040 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1041 {
1042         struct cfg80211_internal_bss *scan, *tmp;
1043         struct cfg80211_beacon_registration *reg, *treg;
1044         rfkill_destroy(rdev->rfkill);
1045         list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1046                 list_del(&reg->list);
1047                 kfree(reg);
1048         }
1049         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1050                 cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1051         kfree(rdev);
1052 }
1053
1054 void wiphy_free(struct wiphy *wiphy)
1055 {
1056         put_device(&wiphy->dev);
1057 }
1058 EXPORT_SYMBOL(wiphy_free);
1059
1060 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
1061 {
1062         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1063
1064         if (rfkill_set_hw_state(rdev->rfkill, blocked))
1065                 schedule_work(&rdev->rfkill_block);
1066 }
1067 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
1068
1069 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1070 {
1071         kfree(wdev->cqm_config);
1072         wdev->cqm_config = NULL;
1073 }
1074
1075 static void __cfg80211_unregister_wdev(struct wireless_dev *wdev, bool sync)
1076 {
1077         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1078
1079         ASSERT_RTNL();
1080
1081         flush_work(&wdev->pmsr_free_wk);
1082
1083         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1084
1085         list_del_rcu(&wdev->list);
1086         if (sync)
1087                 synchronize_rcu();
1088         rdev->devlist_generation++;
1089
1090         cfg80211_mlme_purge_registrations(wdev);
1091
1092         switch (wdev->iftype) {
1093         case NL80211_IFTYPE_P2P_DEVICE:
1094                 cfg80211_stop_p2p_device(rdev, wdev);
1095                 break;
1096         case NL80211_IFTYPE_NAN:
1097                 cfg80211_stop_nan(rdev, wdev);
1098                 break;
1099         default:
1100                 break;
1101         }
1102
1103 #ifdef CONFIG_CFG80211_WEXT
1104         kzfree(wdev->wext.keys);
1105         wdev->wext.keys = NULL;
1106 #endif
1107         /* only initialized if we have a netdev */
1108         if (wdev->netdev)
1109                 flush_work(&wdev->disconnect_wk);
1110
1111         cfg80211_cqm_config_free(wdev);
1112 }
1113
1114 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1115 {
1116         if (WARN_ON(wdev->netdev))
1117                 return;
1118
1119         __cfg80211_unregister_wdev(wdev, true);
1120 }
1121 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1122
1123 static const struct device_type wiphy_type = {
1124         .name   = "wlan",
1125 };
1126
1127 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1128                                enum nl80211_iftype iftype, int num)
1129 {
1130         ASSERT_RTNL();
1131
1132         rdev->num_running_ifaces += num;
1133         if (iftype == NL80211_IFTYPE_MONITOR)
1134                 rdev->num_running_monitor_ifaces += num;
1135 }
1136
1137 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1138                       struct wireless_dev *wdev)
1139 {
1140         struct net_device *dev = wdev->netdev;
1141         struct cfg80211_sched_scan_request *pos, *tmp;
1142
1143         ASSERT_RTNL();
1144         ASSERT_WDEV_LOCK(wdev);
1145
1146         cfg80211_pmsr_wdev_down(wdev);
1147
1148         switch (wdev->iftype) {
1149         case NL80211_IFTYPE_ADHOC:
1150                 __cfg80211_leave_ibss(rdev, dev, true);
1151                 break;
1152         case NL80211_IFTYPE_P2P_CLIENT:
1153         case NL80211_IFTYPE_STATION:
1154                 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1155                                          list) {
1156                         if (dev == pos->dev)
1157                                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1158                 }
1159
1160 #ifdef CONFIG_CFG80211_WEXT
1161                 kfree(wdev->wext.ie);
1162                 wdev->wext.ie = NULL;
1163                 wdev->wext.ie_len = 0;
1164                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1165 #endif
1166                 cfg80211_disconnect(rdev, dev,
1167                                     WLAN_REASON_DEAUTH_LEAVING, true);
1168                 break;
1169         case NL80211_IFTYPE_MESH_POINT:
1170                 __cfg80211_leave_mesh(rdev, dev);
1171                 break;
1172         case NL80211_IFTYPE_AP:
1173         case NL80211_IFTYPE_P2P_GO:
1174                 __cfg80211_stop_ap(rdev, dev, true);
1175                 break;
1176         case NL80211_IFTYPE_OCB:
1177                 __cfg80211_leave_ocb(rdev, dev);
1178                 break;
1179         case NL80211_IFTYPE_WDS:
1180                 /* must be handled by mac80211/driver, has no APIs */
1181                 break;
1182         case NL80211_IFTYPE_P2P_DEVICE:
1183         case NL80211_IFTYPE_NAN:
1184                 /* cannot happen, has no netdev */
1185                 break;
1186         case NL80211_IFTYPE_AP_VLAN:
1187         case NL80211_IFTYPE_MONITOR:
1188                 /* nothing to do */
1189                 break;
1190         case NL80211_IFTYPE_UNSPECIFIED:
1191         case NUM_NL80211_IFTYPES:
1192                 /* invalid */
1193                 break;
1194         }
1195 }
1196
1197 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1198                     struct wireless_dev *wdev)
1199 {
1200         wdev_lock(wdev);
1201         __cfg80211_leave(rdev, wdev);
1202         wdev_unlock(wdev);
1203 }
1204
1205 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1206                          gfp_t gfp)
1207 {
1208         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1209         struct cfg80211_event *ev;
1210         unsigned long flags;
1211
1212         trace_cfg80211_stop_iface(wiphy, wdev);
1213
1214         ev = kzalloc(sizeof(*ev), gfp);
1215         if (!ev)
1216                 return;
1217
1218         ev->type = EVENT_STOPPED;
1219
1220         spin_lock_irqsave(&wdev->event_lock, flags);
1221         list_add_tail(&ev->list, &wdev->event_list);
1222         spin_unlock_irqrestore(&wdev->event_lock, flags);
1223         queue_work(cfg80211_wq, &rdev->event_work);
1224 }
1225 EXPORT_SYMBOL(cfg80211_stop_iface);
1226
1227 void cfg80211_init_wdev(struct wireless_dev *wdev)
1228 {
1229         mutex_init(&wdev->mtx);
1230         INIT_LIST_HEAD(&wdev->event_list);
1231         spin_lock_init(&wdev->event_lock);
1232         INIT_LIST_HEAD(&wdev->mgmt_registrations);
1233         spin_lock_init(&wdev->mgmt_registrations_lock);
1234         INIT_LIST_HEAD(&wdev->pmsr_list);
1235         spin_lock_init(&wdev->pmsr_lock);
1236         INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1237
1238 #ifdef CONFIG_CFG80211_WEXT
1239         wdev->wext.default_key = -1;
1240         wdev->wext.default_mgmt_key = -1;
1241         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1242 #endif
1243
1244         if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1245                 wdev->ps = true;
1246         else
1247                 wdev->ps = false;
1248         /* allow mac80211 to determine the timeout */
1249         wdev->ps_timeout = -1;
1250
1251         if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1252              wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1253              wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1254                 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1255
1256         INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1257 }
1258
1259 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1260                             struct wireless_dev *wdev)
1261 {
1262         /*
1263          * We get here also when the interface changes network namespaces,
1264          * as it's registered into the new one, but we don't want it to
1265          * change ID in that case. Checking if the ID is already assigned
1266          * works, because 0 isn't considered a valid ID and the memory is
1267          * 0-initialized.
1268          */
1269         if (!wdev->identifier)
1270                 wdev->identifier = ++rdev->wdev_id;
1271         list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1272         rdev->devlist_generation++;
1273
1274         nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1275 }
1276
1277 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1278                                          unsigned long state, void *ptr)
1279 {
1280         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1281         struct wireless_dev *wdev = dev->ieee80211_ptr;
1282         struct cfg80211_registered_device *rdev;
1283         struct cfg80211_sched_scan_request *pos, *tmp;
1284
1285         if (!wdev)
1286                 return NOTIFY_DONE;
1287
1288         rdev = wiphy_to_rdev(wdev->wiphy);
1289
1290         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1291
1292         switch (state) {
1293         case NETDEV_POST_INIT:
1294                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1295                 wdev->netdev = dev;
1296                 /* can only change netns with wiphy */
1297                 dev->features |= NETIF_F_NETNS_LOCAL;
1298
1299                 cfg80211_init_wdev(wdev);
1300                 break;
1301         case NETDEV_REGISTER:
1302                 /*
1303                  * NB: cannot take rdev->mtx here because this may be
1304                  * called within code protected by it when interfaces
1305                  * are added with nl80211.
1306                  */
1307                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
1308                                       "phy80211")) {
1309                         pr_err("failed to add phy80211 symlink to netdev!\n");
1310                 }
1311
1312                 cfg80211_register_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);