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) 2018-2025 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 /* maximum length of radio debugfs directory name */ 38 #define RADIO_DEBUGFSDIR_MAX_LEN 8 39 40 MODULE_AUTHOR("Johannes Berg"); 41 MODULE_LICENSE("GPL"); 42 MODULE_DESCRIPTION("wireless configuration support"); 43 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME); 44 45 /* RCU-protected (and RTNL for writers) */ 46 LIST_HEAD(cfg80211_rdev_list); 47 int cfg80211_rdev_list_generation; 48 49 /* for debugfs */ 50 static struct dentry *ieee80211_debugfs_dir; 51 52 /* for the cleanup, scan and event works */ 53 struct workqueue_struct *cfg80211_wq; 54 55 static bool cfg80211_disable_40mhz_24ghz; 56 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644); 57 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz, 58 "Disable 40MHz support in the 2.4GHz band"); 59 60 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx) 61 { 62 struct cfg80211_registered_device *result = NULL, *rdev; 63 64 ASSERT_RTNL(); 65 66 for_each_rdev(rdev) { 67 if (rdev->wiphy_idx == wiphy_idx) { 68 result = rdev; 69 break; 70 } 71 } 72 73 return result; 74 } 75 76 int get_wiphy_idx(struct wiphy *wiphy) 77 { 78 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 79 80 return rdev->wiphy_idx; 81 } 82 83 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx) 84 { 85 struct cfg80211_registered_device *rdev; 86 87 ASSERT_RTNL(); 88 89 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx); 90 if (!rdev) 91 return NULL; 92 return &rdev->wiphy; 93 } 94 95 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev, 96 const char *newname) 97 { 98 struct cfg80211_registered_device *rdev2; 99 int wiphy_idx, taken = -1, digits; 100 101 ASSERT_RTNL(); 102 103 if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN) 104 return -EINVAL; 105 106 /* prohibit calling the thing phy%d when %d is not its number */ 107 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken); 108 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) { 109 /* count number of places needed to print wiphy_idx */ 110 digits = 1; 111 while (wiphy_idx /= 10) 112 digits++; 113 /* 114 * deny the name if it is phy<idx> where <idx> is printed 115 * without leading zeroes. taken == strlen(newname) here 116 */ 117 if (taken == strlen(PHY_NAME) + digits) 118 return -EINVAL; 119 } 120 121 /* Ensure another device does not already have this name. */ 122 for_each_rdev(rdev2) 123 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0) 124 return -EINVAL; 125 126 return 0; 127 } 128 129 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, 130 char *newname) 131 { 132 int result; 133 134 ASSERT_RTNL(); 135 lockdep_assert_wiphy(&rdev->wiphy); 136 137 /* Ignore nop renames */ 138 if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0) 139 return 0; 140 141 result = cfg80211_dev_check_name(rdev, newname); 142 if (result < 0) 143 return result; 144 145 result = device_rename(&rdev->wiphy.dev, newname); 146 if (result) 147 return result; 148 149 debugfs_change_name(rdev->wiphy.debugfsdir, "%s", newname); 150 151 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 152 153 return 0; 154 } 155 156 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, 157 struct net *net) 158 { 159 struct wireless_dev *wdev; 160 int err = 0; 161 162 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK)) 163 return -EOPNOTSUPP; 164 165 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 166 if (!wdev->netdev) 167 continue; 168 wdev->netdev->netns_immutable = false; 169 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); 170 if (err) 171 break; 172 wdev->netdev->netns_immutable = true; 173 } 174 175 if (err) { 176 /* failed -- clean up to old netns */ 177 net = wiphy_net(&rdev->wiphy); 178 179 list_for_each_entry_continue_reverse(wdev, 180 &rdev->wiphy.wdev_list, 181 list) { 182 if (!wdev->netdev) 183 continue; 184 wdev->netdev->netns_immutable = false; 185 err = dev_change_net_namespace(wdev->netdev, net, 186 "wlan%d"); 187 WARN_ON(err); 188 wdev->netdev->netns_immutable = true; 189 } 190 191 return err; 192 } 193 194 guard(wiphy)(&rdev->wiphy); 195 196 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 197 if (!wdev->netdev) 198 continue; 199 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 200 } 201 202 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 203 204 wiphy_net_set(&rdev->wiphy, net); 205 206 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev)); 207 WARN_ON(err); 208 209 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 210 211 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 212 if (!wdev->netdev) 213 continue; 214 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 215 } 216 217 return 0; 218 } 219 220 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data) 221 { 222 struct cfg80211_registered_device *rdev = data; 223 224 guard(wiphy)(&rdev->wiphy); 225 226 rdev_rfkill_poll(rdev); 227 } 228 229 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev, 230 struct wireless_dev *wdev) 231 { 232 lockdep_assert_held(&rdev->wiphy.mtx); 233 234 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE)) 235 return; 236 237 if (!wdev_running(wdev)) 238 return; 239 240 rdev_stop_p2p_device(rdev, wdev); 241 wdev->is_running = false; 242 243 rdev->opencount--; 244 245 if (rdev->scan_req && rdev->scan_req->req.wdev == wdev) { 246 if (WARN_ON(!rdev->scan_req->notified && 247 (!rdev->int_scan_req || 248 !rdev->int_scan_req->notified))) 249 rdev->scan_req->info.aborted = true; 250 ___cfg80211_scan_done(rdev, false); 251 } 252 } 253 254 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev, 255 struct wireless_dev *wdev) 256 { 257 lockdep_assert_held(&rdev->wiphy.mtx); 258 259 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN)) 260 return; 261 262 if (!wdev_running(wdev)) 263 return; 264 265 rdev_stop_nan(rdev, wdev); 266 wdev->is_running = false; 267 268 rdev->opencount--; 269 } 270 271 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy) 272 { 273 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 274 struct wireless_dev *wdev; 275 276 ASSERT_RTNL(); 277 278 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 279 if (wdev->netdev) { 280 dev_close(wdev->netdev); 281 continue; 282 } 283 284 /* otherwise, check iftype */ 285 286 guard(wiphy)(wiphy); 287 288 switch (wdev->iftype) { 289 case NL80211_IFTYPE_P2P_DEVICE: 290 cfg80211_stop_p2p_device(rdev, wdev); 291 break; 292 case NL80211_IFTYPE_NAN: 293 cfg80211_stop_nan(rdev, wdev); 294 break; 295 default: 296 break; 297 } 298 } 299 } 300 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces); 301 302 static int cfg80211_rfkill_set_block(void *data, bool blocked) 303 { 304 struct cfg80211_registered_device *rdev = data; 305 306 if (!blocked) 307 return 0; 308 309 rtnl_lock(); 310 cfg80211_shutdown_all_interfaces(&rdev->wiphy); 311 rtnl_unlock(); 312 313 return 0; 314 } 315 316 static void cfg80211_rfkill_block_work(struct work_struct *work) 317 { 318 struct cfg80211_registered_device *rdev; 319 320 rdev = container_of(work, struct cfg80211_registered_device, 321 rfkill_block); 322 cfg80211_rfkill_set_block(rdev, true); 323 } 324 325 static void cfg80211_event_work(struct work_struct *work) 326 { 327 struct cfg80211_registered_device *rdev; 328 329 rdev = container_of(work, struct cfg80211_registered_device, 330 event_work); 331 332 guard(wiphy)(&rdev->wiphy); 333 334 cfg80211_process_rdev_events(rdev); 335 } 336 337 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev) 338 { 339 struct wireless_dev *wdev, *tmp; 340 341 ASSERT_RTNL(); 342 343 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) { 344 if (wdev->nl_owner_dead) { 345 if (wdev->netdev) 346 dev_close(wdev->netdev); 347 348 guard(wiphy)(&rdev->wiphy); 349 350 cfg80211_leave(rdev, wdev); 351 cfg80211_remove_virtual_intf(rdev, wdev); 352 } 353 } 354 } 355 356 static void cfg80211_destroy_iface_wk(struct work_struct *work) 357 { 358 struct cfg80211_registered_device *rdev; 359 360 rdev = container_of(work, struct cfg80211_registered_device, 361 destroy_work); 362 363 rtnl_lock(); 364 cfg80211_destroy_ifaces(rdev); 365 rtnl_unlock(); 366 } 367 368 static void cfg80211_sched_scan_stop_wk(struct wiphy *wiphy, 369 struct wiphy_work *work) 370 { 371 struct cfg80211_registered_device *rdev; 372 struct cfg80211_sched_scan_request *req, *tmp; 373 374 rdev = container_of(work, struct cfg80211_registered_device, 375 sched_scan_stop_wk); 376 377 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { 378 if (req->nl_owner_dead) 379 cfg80211_stop_sched_scan_req(rdev, req, false); 380 } 381 } 382 383 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work) 384 { 385 struct cfg80211_registered_device *rdev; 386 387 rdev = container_of(work, struct cfg80211_registered_device, 388 propagate_radar_detect_wk); 389 390 rtnl_lock(); 391 392 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef, 393 NL80211_DFS_UNAVAILABLE, 394 NL80211_RADAR_DETECTED); 395 396 rtnl_unlock(); 397 } 398 399 static void cfg80211_propagate_cac_done_wk(struct work_struct *work) 400 { 401 struct cfg80211_registered_device *rdev; 402 403 rdev = container_of(work, struct cfg80211_registered_device, 404 propagate_cac_done_wk); 405 406 rtnl_lock(); 407 408 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef, 409 NL80211_DFS_AVAILABLE, 410 NL80211_RADAR_CAC_FINISHED); 411 412 rtnl_unlock(); 413 } 414 415 static void cfg80211_wiphy_work(struct work_struct *work) 416 { 417 struct cfg80211_registered_device *rdev; 418 struct wiphy_work *wk; 419 420 rdev = container_of(work, struct cfg80211_registered_device, wiphy_work); 421 422 trace_wiphy_work_worker_start(&rdev->wiphy); 423 424 guard(wiphy)(&rdev->wiphy); 425 if (rdev->suspended) 426 return; 427 428 spin_lock_irq(&rdev->wiphy_work_lock); 429 wk = list_first_entry_or_null(&rdev->wiphy_work_list, 430 struct wiphy_work, entry); 431 if (wk) { 432 list_del_init(&wk->entry); 433 if (!list_empty(&rdev->wiphy_work_list)) 434 queue_work(system_unbound_wq, work); 435 spin_unlock_irq(&rdev->wiphy_work_lock); 436 437 trace_wiphy_work_run(&rdev->wiphy, wk); 438 wk->func(&rdev->wiphy, wk); 439 } else { 440 spin_unlock_irq(&rdev->wiphy_work_lock); 441 } 442 } 443 444 /* exported functions */ 445 446 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, 447 const char *requested_name) 448 { 449 static atomic_t wiphy_counter = ATOMIC_INIT(0); 450 451 struct cfg80211_registered_device *rdev; 452 int alloc_size; 453 454 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 455 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 456 WARN_ON(ops->connect && !ops->disconnect); 457 WARN_ON(ops->join_ibss && !ops->leave_ibss); 458 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 459 WARN_ON(ops->add_station && !ops->del_station); 460 WARN_ON(ops->add_mpath && !ops->del_mpath); 461 WARN_ON(ops->join_mesh && !ops->leave_mesh); 462 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device); 463 WARN_ON(ops->start_ap && !ops->stop_ap); 464 WARN_ON(ops->join_ocb && !ops->leave_ocb); 465 WARN_ON(ops->suspend && !ops->resume); 466 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop); 467 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel); 468 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch); 469 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts); 470 471 alloc_size = sizeof(*rdev) + sizeof_priv; 472 473 rdev = kzalloc(alloc_size, GFP_KERNEL); 474 if (!rdev) 475 return NULL; 476 477 rdev->ops = ops; 478 479 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 480 481 if (unlikely(rdev->wiphy_idx < 0)) { 482 /* ugh, wrapped! */ 483 atomic_dec(&wiphy_counter); 484 kfree(rdev); 485 return NULL; 486 } 487 488 /* atomic_inc_return makes it start at 1, make it start at 0 */ 489 rdev->wiphy_idx--; 490 491 /* give it a proper name */ 492 if (requested_name && requested_name[0]) { 493 int rv; 494 495 rtnl_lock(); 496 rv = cfg80211_dev_check_name(rdev, requested_name); 497 498 if (rv < 0) { 499 rtnl_unlock(); 500 goto use_default_name; 501 } 502 503 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); 504 rtnl_unlock(); 505 if (rv) 506 goto use_default_name; 507 } else { 508 int rv; 509 510 use_default_name: 511 /* NOTE: This is *probably* safe w/out holding rtnl because of 512 * the restrictions on phy names. Probably this call could 513 * fail if some other part of the kernel (re)named a device 514 * phyX. But, might should add some locking and check return 515 * value, and use a different name if this one exists? 516 */ 517 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 518 if (rv < 0) { 519 kfree(rdev); 520 return NULL; 521 } 522 } 523 524 mutex_init(&rdev->wiphy.mtx); 525 INIT_LIST_HEAD(&rdev->wiphy.wdev_list); 526 INIT_LIST_HEAD(&rdev->beacon_registrations); 527 spin_lock_init(&rdev->beacon_registrations_lock); 528 spin_lock_init(&rdev->bss_lock); 529 INIT_LIST_HEAD(&rdev->bss_list); 530 INIT_LIST_HEAD(&rdev->sched_scan_req_list); 531 wiphy_work_init(&rdev->scan_done_wk, __cfg80211_scan_done); 532 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 533 cfg80211_dfs_channels_update_work); 534 #ifdef CONFIG_CFG80211_WEXT 535 rdev->wiphy.wext = &cfg80211_wext_handler; 536 #endif 537 538 device_initialize(&rdev->wiphy.dev); 539 rdev->wiphy.dev.class = &ieee80211_class; 540 rdev->wiphy.dev.platform_data = rdev; 541 device_enable_async_suspend(&rdev->wiphy.dev); 542 543 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 544 wiphy_work_init(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 545 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk); 546 INIT_WORK(&rdev->propagate_radar_detect_wk, 547 cfg80211_propagate_radar_detect_wk); 548 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk); 549 INIT_WORK(&rdev->mgmt_registrations_update_wk, 550 cfg80211_mgmt_registrations_update_wk); 551 spin_lock_init(&rdev->mgmt_registrations_lock); 552 INIT_WORK(&rdev->wiphy_work, cfg80211_wiphy_work); 553 INIT_LIST_HEAD(&rdev->wiphy_work_list); 554 spin_lock_init(&rdev->wiphy_work_lock); 555 556 #ifdef CONFIG_CFG80211_DEFAULT_PS 557 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 558 #endif 559 560 wiphy_net_set(&rdev->wiphy, &init_net); 561 562 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 563 rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 564 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 565 &rdev->rfkill_ops, rdev); 566 567 if (!rdev->wiphy.rfkill) { 568 wiphy_free(&rdev->wiphy); 569 return NULL; 570 } 571 572 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work); 573 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 574 INIT_WORK(&rdev->event_work, cfg80211_event_work); 575 INIT_WORK(&rdev->background_cac_abort_wk, 576 cfg80211_background_cac_abort_wk); 577 INIT_DELAYED_WORK(&rdev->background_cac_done_wk, 578 cfg80211_background_cac_done_wk); 579 580 init_waitqueue_head(&rdev->dev_wait); 581 582 /* 583 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 584 * Fragmentation and RTS threshold are disabled by default with the 585 * special -1 value. 586 */ 587 rdev->wiphy.retry_short = 7; 588 rdev->wiphy.retry_long = 4; 589 rdev->wiphy.frag_threshold = (u32) -1; 590 rdev->wiphy.rts_threshold = (u32) -1; 591 rdev->wiphy.coverage_class = 0; 592 593 rdev->wiphy.max_num_csa_counters = 1; 594 595 rdev->wiphy.max_sched_scan_plans = 1; 596 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 597 598 return &rdev->wiphy; 599 } 600 EXPORT_SYMBOL(wiphy_new_nm); 601 602 static 603 int wiphy_verify_iface_combinations(struct wiphy *wiphy, 604 const struct ieee80211_iface_combination *iface_comb, 605 int n_iface_comb, 606 bool combined_radio) 607 { 608 const struct ieee80211_iface_combination *c; 609 int i, j; 610 611 for (i = 0; i < n_iface_comb; i++) { 612 u32 cnt = 0; 613 u16 all_iftypes = 0; 614 615 c = &iface_comb[i]; 616 617 /* 618 * Combinations with just one interface aren't real, 619 * however we make an exception for DFS. 620 */ 621 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 622 return -EINVAL; 623 624 /* Need at least one channel */ 625 if (WARN_ON(!c->num_different_channels)) 626 return -EINVAL; 627 628 /* DFS only works on one channel. Avoid this check 629 * for multi-radio global combination, since it hold 630 * the capabilities of all radio combinations. 631 */ 632 if (!combined_radio && 633 WARN_ON(c->radar_detect_widths && 634 c->num_different_channels > 1)) 635 return -EINVAL; 636 637 if (WARN_ON(!c->n_limits)) 638 return -EINVAL; 639 640 for (j = 0; j < c->n_limits; j++) { 641 u16 types = c->limits[j].types; 642 643 /* interface types shouldn't overlap */ 644 if (WARN_ON(types & all_iftypes)) 645 return -EINVAL; 646 all_iftypes |= types; 647 648 if (WARN_ON(!c->limits[j].max)) 649 return -EINVAL; 650 651 /* Shouldn't list software iftypes in combinations! */ 652 if (WARN_ON(wiphy->software_iftypes & types)) 653 return -EINVAL; 654 655 /* Only a single P2P_DEVICE can be allowed, avoid this 656 * check for multi-radio global combination, since it 657 * hold the capabilities of all radio combinations. 658 */ 659 if (!combined_radio && 660 WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 661 c->limits[j].max > 1)) 662 return -EINVAL; 663 664 /* Only a single NAN can be allowed, avoid this 665 * check for multi-radio global combination, since it 666 * hold the capabilities of all radio combinations. 667 */ 668 if (!combined_radio && 669 WARN_ON(types & BIT(NL80211_IFTYPE_NAN) && 670 c->limits[j].max > 1)) 671 return -EINVAL; 672 673 /* 674 * This isn't well-defined right now. If you have an 675 * IBSS interface, then its beacon interval may change 676 * by joining other networks, and nothing prevents it 677 * from doing that. 678 * So technically we probably shouldn't even allow AP 679 * and IBSS in the same interface, but it seems that 680 * some drivers support that, possibly only with fixed 681 * beacon intervals for IBSS. 682 */ 683 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) && 684 c->beacon_int_min_gcd)) { 685 return -EINVAL; 686 } 687 688 cnt += c->limits[j].max; 689 /* 690 * Don't advertise an unsupported type 691 * in a combination. 692 */ 693 if (WARN_ON((wiphy->interface_modes & types) != types)) 694 return -EINVAL; 695 } 696 697 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS))) 698 return -EINVAL; 699 700 /* You can't even choose that many! */ 701 if (WARN_ON(cnt < c->max_interfaces)) 702 return -EINVAL; 703 } 704 705 return 0; 706 } 707 708 static int wiphy_verify_combinations(struct wiphy *wiphy) 709 { 710 int i, ret; 711 bool combined_radio = false; 712 713 if (wiphy->n_radio) { 714 for (i = 0; i < wiphy->n_radio; i++) { 715 const struct wiphy_radio *radio = &wiphy->radio[i]; 716 717 ret = wiphy_verify_iface_combinations(wiphy, 718 radio->iface_combinations, 719 radio->n_iface_combinations, 720 false); 721 if (ret) 722 return ret; 723 } 724 725 combined_radio = true; 726 } 727 728 ret = wiphy_verify_iface_combinations(wiphy, 729 wiphy->iface_combinations, 730 wiphy->n_iface_combinations, 731 combined_radio); 732 733 return ret; 734 } 735 736 int wiphy_register(struct wiphy *wiphy) 737 { 738 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 739 int res; 740 enum nl80211_band band; 741 struct ieee80211_supported_band *sband; 742 bool have_band = false; 743 int i; 744 u16 ifmodes = wiphy->interface_modes; 745 746 #ifdef CONFIG_PM 747 if (WARN_ON(wiphy->wowlan && 748 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 749 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 750 return -EINVAL; 751 if (WARN_ON(wiphy->wowlan && 752 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 753 !wiphy->wowlan->tcp)) 754 return -EINVAL; 755 #endif 756 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 757 (!rdev->ops->tdls_channel_switch || 758 !rdev->ops->tdls_cancel_channel_switch))) 759 return -EINVAL; 760 761 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) && 762 (!rdev->ops->start_nan || !rdev->ops->stop_nan || 763 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func || 764 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ))))) 765 return -EINVAL; 766 767 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))) 768 return -EINVAL; 769 770 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported)) 771 return -EINVAL; 772 773 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) { 774 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap && 775 !wiphy->pmsr_capa->ftm.non_asap)) 776 return -EINVAL; 777 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles || 778 !wiphy->pmsr_capa->ftm.bandwidths)) 779 return -EINVAL; 780 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles & 781 ~(BIT(NL80211_PREAMBLE_LEGACY) | 782 BIT(NL80211_PREAMBLE_HT) | 783 BIT(NL80211_PREAMBLE_VHT) | 784 BIT(NL80211_PREAMBLE_HE) | 785 BIT(NL80211_PREAMBLE_DMG)))) 786 return -EINVAL; 787 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based || 788 wiphy->pmsr_capa->ftm.non_trigger_based) && 789 !(wiphy->pmsr_capa->ftm.preambles & 790 BIT(NL80211_PREAMBLE_HE)))) 791 return -EINVAL; 792 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths & 793 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) | 794 BIT(NL80211_CHAN_WIDTH_20) | 795 BIT(NL80211_CHAN_WIDTH_40) | 796 BIT(NL80211_CHAN_WIDTH_80) | 797 BIT(NL80211_CHAN_WIDTH_80P80) | 798 BIT(NL80211_CHAN_WIDTH_160) | 799 BIT(NL80211_CHAN_WIDTH_320) | 800 BIT(NL80211_CHAN_WIDTH_5) | 801 BIT(NL80211_CHAN_WIDTH_10)))) 802 return -EINVAL; 803 } 804 805 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 806 (wiphy->regulatory_flags & 807 (REGULATORY_CUSTOM_REG | 808 REGULATORY_STRICT_REG | 809 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 810 REGULATORY_COUNTRY_IE_IGNORE)))) 811 return -EINVAL; 812 813 if (WARN_ON(wiphy->coalesce && 814 (!wiphy->coalesce->n_rules || 815 !wiphy->coalesce->n_patterns) && 816 (!wiphy->coalesce->pattern_min_len || 817 wiphy->coalesce->pattern_min_len > 818 wiphy->coalesce->pattern_max_len))) 819 return -EINVAL; 820 821 if (WARN_ON(wiphy->ap_sme_capa && 822 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 823 return -EINVAL; 824 825 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 826 return -EINVAL; 827 828 if (WARN_ON(wiphy->addresses && 829 !is_zero_ether_addr(wiphy->perm_addr) && 830 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 831 ETH_ALEN))) 832 return -EINVAL; 833 834 if (WARN_ON(wiphy->max_acl_mac_addrs && 835 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 836 !rdev->ops->set_mac_acl))) 837 return -EINVAL; 838 839 /* assure only valid behaviours are flagged by driver 840 * hence subtract 2 as bit 0 is invalid. 841 */ 842 if (WARN_ON(wiphy->bss_select_support && 843 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 844 return -EINVAL; 845 846 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy, 847 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) && 848 (!rdev->ops->set_pmk || !rdev->ops->del_pmk))) 849 return -EINVAL; 850 851 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) && 852 rdev->ops->update_connect_params)) 853 return -EINVAL; 854 855 if (wiphy->addresses) 856 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 857 858 /* sanity check ifmodes */ 859 WARN_ON(!ifmodes); 860 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 861 if (WARN_ON(ifmodes != wiphy->interface_modes)) 862 wiphy->interface_modes = ifmodes; 863 864 res = wiphy_verify_combinations(wiphy); 865 if (res) 866 return res; 867 868 /* sanity check supported bands/channels */ 869 for (band = 0; band < NUM_NL80211_BANDS; band++) { 870 const struct ieee80211_sband_iftype_data *iftd; 871 u16 types = 0; 872 bool have_he = false; 873 874 sband = wiphy->bands[band]; 875 if (!sband) 876 continue; 877 878 sband->band = band; 879 if (WARN_ON(!sband->n_channels)) 880 return -EINVAL; 881 /* 882 * on 60GHz or sub-1Ghz band, there are no legacy rates, so 883 * n_bitrates is 0 884 */ 885 if (WARN_ON((band != NL80211_BAND_60GHZ && 886 band != NL80211_BAND_S1GHZ) && 887 !sband->n_bitrates)) 888 return -EINVAL; 889 890 if (WARN_ON(band == NL80211_BAND_6GHZ && 891 (sband->ht_cap.ht_supported || 892 sband->vht_cap.vht_supported))) 893 return -EINVAL; 894 895 /* 896 * Since cfg80211_disable_40mhz_24ghz is global, we can 897 * modify the sband's ht data even if the driver uses a 898 * global structure for that. 899 */ 900 if (cfg80211_disable_40mhz_24ghz && 901 band == NL80211_BAND_2GHZ && 902 sband->ht_cap.ht_supported) { 903 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 904 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 905 } 906 907 /* 908 * Since we use a u32 for rate bitmaps in 909 * ieee80211_get_response_rate, we cannot 910 * have more than 32 legacy rates. 911 */ 912 if (WARN_ON(sband->n_bitrates > 32)) 913 return -EINVAL; 914 915 for (i = 0; i < sband->n_channels; i++) { 916 sband->channels[i].orig_flags = 917 sband->channels[i].flags; 918 sband->channels[i].orig_mag = INT_MAX; 919 sband->channels[i].orig_mpwr = 920 sband->channels[i].max_power; 921 sband->channels[i].band = band; 922 923 if (WARN_ON(sband->channels[i].freq_offset >= 1000)) 924 return -EINVAL; 925 } 926 927 for_each_sband_iftype_data(sband, i, iftd) { 928 bool has_ap, has_non_ap; 929 u32 ap_bits = BIT(NL80211_IFTYPE_AP) | 930 BIT(NL80211_IFTYPE_P2P_GO); 931 932 if (WARN_ON(!iftd->types_mask)) 933 return -EINVAL; 934 if (WARN_ON(types & iftd->types_mask)) 935 return -EINVAL; 936 937 /* at least one piece of information must be present */ 938 if (WARN_ON(!iftd->he_cap.has_he)) 939 return -EINVAL; 940 941 types |= iftd->types_mask; 942 943 if (i == 0) 944 have_he = iftd->he_cap.has_he; 945 else 946 have_he = have_he && 947 iftd->he_cap.has_he; 948 949 has_ap = iftd->types_mask & ap_bits; 950 has_non_ap = iftd->types_mask & ~ap_bits; 951 952 /* 953 * For EHT 20 MHz STA, the capabilities format differs 954 * but to simplify, don't check 20 MHz but rather check 955 * only if AP and non-AP were mentioned at the same time, 956 * reject if so. 957 */ 958 if (WARN_ON(iftd->eht_cap.has_eht && 959 has_ap && has_non_ap)) 960 return -EINVAL; 961 } 962 963 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ)) 964 return -EINVAL; 965 966 have_band = true; 967 } 968 969 if (!have_band) { 970 WARN_ON(1); 971 return -EINVAL; 972 } 973 974 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) { 975 /* 976 * Validate we have a policy (can be explicitly set to 977 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that 978 * we have at least one of doit/dumpit. 979 */ 980 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy)) 981 return -EINVAL; 982 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit && 983 !rdev->wiphy.vendor_commands[i].dumpit)) 984 return -EINVAL; 985 } 986 987 #ifdef CONFIG_PM 988 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 989 (!rdev->wiphy.wowlan->pattern_min_len || 990 rdev->wiphy.wowlan->pattern_min_len > 991 rdev->wiphy.wowlan->pattern_max_len))) 992 return -EINVAL; 993 #endif 994 995 if (!wiphy->max_num_akm_suites) 996 wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES; 997 else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES || 998 wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES) 999 return -EINVAL; 1000 1001 /* Allocate radio configuration space for multi-radio wiphy */ 1002 if (wiphy->n_radio > 0) { 1003 int idx; 1004 1005 wiphy->radio_cfg = kcalloc(wiphy->n_radio, 1006 sizeof(*wiphy->radio_cfg), 1007 GFP_KERNEL); 1008 if (!wiphy->radio_cfg) 1009 return -ENOMEM; 1010 /* 1011 * Initialize wiphy radio parameters to IEEE 802.11 1012 * MIB default values. RTS threshold is disabled by 1013 * default with the special -1 value. 1014 */ 1015 for (idx = 0; idx < wiphy->n_radio; idx++) 1016 wiphy->radio_cfg[idx].rts_threshold = (u32)-1; 1017 } 1018 1019 /* check and set up bitrates */ 1020 ieee80211_set_bitrate_flags(wiphy); 1021 1022 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 1023 1024 if (rdev->wiphy.bss_param_support & WIPHY_BSS_PARAM_P2P_CTWINDOW) 1025 rdev->wiphy.features |= NL80211_FEATURE_P2P_GO_CTWIN; 1026 else if (rdev->wiphy.features & NL80211_FEATURE_P2P_GO_CTWIN) 1027 rdev->wiphy.bss_param_support |= WIPHY_BSS_PARAM_P2P_CTWINDOW; 1028 if (rdev->wiphy.bss_param_support & WIPHY_BSS_PARAM_P2P_OPPPS) 1029 rdev->wiphy.features |= NL80211_FEATURE_P2P_GO_OPPPS; 1030 else if (rdev->wiphy.features & NL80211_FEATURE_P2P_GO_OPPPS) 1031 rdev->wiphy.bss_param_support |= WIPHY_BSS_PARAM_P2P_OPPPS; 1032 1033 rtnl_lock(); 1034 wiphy_lock(&rdev->wiphy); 1035 res = device_add(&rdev->wiphy.dev); 1036 if (res) { 1037 wiphy_unlock(&rdev->wiphy); 1038 rtnl_unlock(); 1039 return res; 1040 } 1041 1042 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 1043 cfg80211_rdev_list_generation++; 1044 1045 /* add to debugfs */ 1046 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy), 1047 ieee80211_debugfs_dir); 1048 if (wiphy->n_radio > 0) { 1049 int idx; 1050 char radio_name[RADIO_DEBUGFSDIR_MAX_LEN]; 1051 1052 for (idx = 0; idx < wiphy->n_radio; idx++) { 1053 scnprintf(radio_name, sizeof(radio_name), "radio%d", 1054 idx); 1055 wiphy->radio_cfg[idx].radio_debugfsdir = 1056 debugfs_create_dir(radio_name, 1057 rdev->wiphy.debugfsdir); 1058 } 1059 } 1060 1061 cfg80211_debugfs_rdev_add(rdev); 1062 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 1063 wiphy_unlock(&rdev->wiphy); 1064 1065 /* set up regulatory info */ 1066 wiphy_regulatory_register(wiphy); 1067 1068 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 1069 struct regulatory_request request = { 1070 .wiphy_idx = get_wiphy_idx(wiphy), 1071 .initiator = NL80211_REGDOM_SET_BY_DRIVER, 1072 .alpha2[0] = '9', 1073 .alpha2[1] = '9', 1074 }; 1075 1076 nl80211_send_reg_change_event(&request); 1077 } 1078 1079 /* Check that nobody globally advertises any capabilities they do not 1080 * advertise on all possible interface types. 1081 */ 1082 if (wiphy->extended_capabilities_len && 1083 wiphy->num_iftype_ext_capab && 1084 wiphy->iftype_ext_capab) { 1085 u8 supported_on_all, j; 1086 const struct wiphy_iftype_ext_capab *capab; 1087 1088 capab = wiphy->iftype_ext_capab; 1089 for (j = 0; j < wiphy->extended_capabilities_len; j++) { 1090 if (capab[0].extended_capabilities_len > j) 1091 supported_on_all = 1092 capab[0].extended_capabilities[j]; 1093 else 1094 supported_on_all = 0x00; 1095 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) { 1096 if (j >= capab[i].extended_capabilities_len) { 1097 supported_on_all = 0x00; 1098 break; 1099 } 1100 supported_on_all &= 1101 capab[i].extended_capabilities[j]; 1102 } 1103 if (WARN_ON(wiphy->extended_capabilities[j] & 1104 ~supported_on_all)) 1105 break; 1106 } 1107 } 1108 1109 rdev->wiphy.registered = true; 1110 rtnl_unlock(); 1111 1112 res = rfkill_register(rdev->wiphy.rfkill); 1113 if (res) { 1114 rfkill_destroy(rdev->wiphy.rfkill); 1115 rdev->wiphy.rfkill = NULL; 1116 wiphy_unregister(&rdev->wiphy); 1117 return res; 1118 } 1119 1120 return 0; 1121 } 1122 EXPORT_SYMBOL(wiphy_register); 1123 1124 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 1125 { 1126 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1127 1128 if (!rdev->ops->rfkill_poll) 1129 return; 1130 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 1131 rfkill_resume_polling(wiphy->rfkill); 1132 } 1133 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 1134 1135 void cfg80211_process_wiphy_works(struct cfg80211_registered_device *rdev, 1136 struct wiphy_work *end) 1137 { 1138 unsigned int runaway_limit = 100; 1139 unsigned long flags; 1140 1141 lockdep_assert_held(&rdev->wiphy.mtx); 1142 1143 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1144 while (!list_empty(&rdev->wiphy_work_list)) { 1145 struct wiphy_work *wk; 1146 1147 wk = list_first_entry(&rdev->wiphy_work_list, 1148 struct wiphy_work, entry); 1149 list_del_init(&wk->entry); 1150 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1151 1152 trace_wiphy_work_run(&rdev->wiphy, wk); 1153 wk->func(&rdev->wiphy, wk); 1154 1155 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1156 1157 if (wk == end) 1158 break; 1159 1160 if (WARN_ON(--runaway_limit == 0)) 1161 INIT_LIST_HEAD(&rdev->wiphy_work_list); 1162 } 1163 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1164 } 1165 1166 void wiphy_unregister(struct wiphy *wiphy) 1167 { 1168 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1169 1170 wait_event(rdev->dev_wait, ({ 1171 int __count; 1172 wiphy_lock(&rdev->wiphy); 1173 __count = rdev->opencount; 1174 wiphy_unlock(&rdev->wiphy); 1175 __count == 0; })); 1176 1177 if (rdev->wiphy.rfkill) 1178 rfkill_unregister(rdev->wiphy.rfkill); 1179 1180 rtnl_lock(); 1181 wiphy_lock(&rdev->wiphy); 1182 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 1183 rdev->wiphy.registered = false; 1184 1185 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 1186 1187 /* 1188 * First remove the hardware from everywhere, this makes 1189 * it impossible to find from userspace. 1190 */ 1191 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 1192 list_del_rcu(&rdev->list); 1193 synchronize_rcu(); 1194 1195 /* 1196 * If this device got a regulatory hint tell core its 1197 * free to listen now to a new shiny device regulatory hint 1198 */ 1199 wiphy_regulatory_deregister(wiphy); 1200 1201 cfg80211_rdev_list_generation++; 1202 device_del(&rdev->wiphy.dev); 1203 1204 #ifdef CONFIG_PM 1205 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 1206 rdev_set_wakeup(rdev, false); 1207 #endif 1208 1209 /* surely nothing is reachable now, clean up work */ 1210 cfg80211_process_wiphy_works(rdev, NULL); 1211 wiphy_unlock(&rdev->wiphy); 1212 rtnl_unlock(); 1213 1214 /* this has nothing to do now but make sure it's gone */ 1215 cancel_work_sync(&rdev->wiphy_work); 1216 1217 cancel_work_sync(&rdev->conn_work); 1218 flush_work(&rdev->event_work); 1219 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 1220 cancel_delayed_work_sync(&rdev->background_cac_done_wk); 1221 flush_work(&rdev->destroy_work); 1222 flush_work(&rdev->propagate_radar_detect_wk); 1223 flush_work(&rdev->propagate_cac_done_wk); 1224 flush_work(&rdev->mgmt_registrations_update_wk); 1225 flush_work(&rdev->background_cac_abort_wk); 1226 1227 cfg80211_rdev_free_wowlan(rdev); 1228 cfg80211_free_coalesce(rdev->coalesce); 1229 rdev->coalesce = NULL; 1230 } 1231 EXPORT_SYMBOL(wiphy_unregister); 1232 1233 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 1234 { 1235 struct cfg80211_internal_bss *scan, *tmp; 1236 struct cfg80211_beacon_registration *reg, *treg; 1237 unsigned long flags; 1238 1239 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1240 WARN_ON(!list_empty(&rdev->wiphy_work_list)); 1241 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1242 cancel_work_sync(&rdev->wiphy_work); 1243 1244 rfkill_destroy(rdev->wiphy.rfkill); 1245 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 1246 list_del(®->list); 1247 kfree(reg); 1248 } 1249 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 1250 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 1251 mutex_destroy(&rdev->wiphy.mtx); 1252 1253 /* 1254 * The 'regd' can only be non-NULL if we never finished 1255 * initializing the wiphy and thus never went through the 1256 * unregister path - e.g. in failure scenarios. Thus, it 1257 * cannot have been visible to anyone if non-NULL, so we 1258 * can just free it here. 1259 */ 1260 kfree(rcu_dereference_raw(rdev->wiphy.regd)); 1261 1262 kfree(rdev); 1263 } 1264 1265 void wiphy_free(struct wiphy *wiphy) 1266 { 1267 kfree(wiphy->radio_cfg); 1268 put_device(&wiphy->dev); 1269 } 1270 EXPORT_SYMBOL(wiphy_free); 1271 1272 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked, 1273 enum rfkill_hard_block_reasons reason) 1274 { 1275 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1276 1277 if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason)) 1278 schedule_work(&rdev->rfkill_block); 1279 } 1280 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason); 1281 1282 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev, 1283 bool unregister_netdev) 1284 { 1285 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1286 struct cfg80211_cqm_config *cqm_config; 1287 unsigned int link_id; 1288 1289 ASSERT_RTNL(); 1290 lockdep_assert_held(&rdev->wiphy.mtx); 1291 1292 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 1293 1294 wdev->registered = false; 1295 1296 if (wdev->netdev) { 1297 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211"); 1298 if (unregister_netdev) 1299 unregister_netdevice(wdev->netdev); 1300 } 1301 1302 list_del_rcu(&wdev->list); 1303 synchronize_net(); 1304 rdev->devlist_generation++; 1305 1306 cfg80211_mlme_purge_registrations(wdev); 1307 1308 switch (wdev->iftype) { 1309 case NL80211_IFTYPE_P2P_DEVICE: 1310 cfg80211_stop_p2p_device(rdev, wdev); 1311 break; 1312 case NL80211_IFTYPE_NAN: 1313 cfg80211_stop_nan(rdev, wdev); 1314 break; 1315 default: 1316 break; 1317 } 1318 1319 #ifdef CONFIG_CFG80211_WEXT 1320 kfree_sensitive(wdev->wext.keys); 1321 wdev->wext.keys = NULL; 1322 #endif 1323 wiphy_work_cancel(wdev->wiphy, &wdev->cqm_rssi_work); 1324 /* deleted from the list, so can't be found from nl80211 any more */ 1325 cqm_config = rcu_access_pointer(wdev->cqm_config); 1326 kfree_rcu(cqm_config, rcu_head); 1327 RCU_INIT_POINTER(wdev->cqm_config, NULL); 1328 1329 /* 1330 * Ensure that all events have been processed and 1331 * freed. 1332 */ 1333 cfg80211_process_wdev_events(wdev); 1334 1335 if (wdev->iftype == NL80211_IFTYPE_STATION || 1336 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) { 1337 for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) { 1338 struct cfg80211_internal_bss *curbss; 1339 1340 curbss = wdev->links[link_id].client.current_bss; 1341 1342 if (WARN_ON(curbss)) { 1343 cfg80211_unhold_bss(curbss); 1344 cfg80211_put_bss(wdev->wiphy, &curbss->pub); 1345 wdev->links[link_id].client.current_bss = NULL; 1346 } 1347 } 1348 } 1349 1350 wdev->connected = false; 1351 } 1352 1353 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 1354 { 1355 _cfg80211_unregister_wdev(wdev, true); 1356 } 1357 EXPORT_SYMBOL(cfg80211_unregister_wdev); 1358 1359 static const struct device_type wiphy_type = { 1360 .name = "wlan", 1361 }; 1362 1363 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 1364 enum nl80211_iftype iftype, int num) 1365 { 1366 lockdep_assert_held(&rdev->wiphy.mtx); 1367 1368 rdev->num_running_ifaces += num; 1369 if (iftype == NL80211_IFTYPE_MONITOR) 1370 rdev->num_running_monitor_ifaces += num; 1371 } 1372 1373 void cfg80211_leave(struct cfg80211_registered_device *rdev, 1374 struct wireless_dev *wdev) 1375 { 1376 struct net_device *dev = wdev->netdev; 1377 struct cfg80211_sched_scan_request *pos, *tmp; 1378 1379 lockdep_assert_held(&rdev->wiphy.mtx); 1380 1381 cfg80211_pmsr_wdev_down(wdev); 1382 1383 cfg80211_stop_background_radar_detection(wdev); 1384 1385 switch (wdev->iftype) { 1386 case NL80211_IFTYPE_ADHOC: 1387 cfg80211_leave_ibss(rdev, dev, true); 1388 break; 1389 case NL80211_IFTYPE_P2P_CLIENT: 1390 case NL80211_IFTYPE_STATION: 1391 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, 1392 list) { 1393 if (dev == pos->dev) 1394 cfg80211_stop_sched_scan_req(rdev, pos, false); 1395 } 1396 1397 #ifdef CONFIG_CFG80211_WEXT 1398 kfree(wdev->wext.ie); 1399 wdev->wext.ie = NULL; 1400 wdev->wext.ie_len = 0; 1401 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1402 #endif 1403 cfg80211_disconnect(rdev, dev, 1404 WLAN_REASON_DEAUTH_LEAVING, true); 1405 break; 1406 case NL80211_IFTYPE_MESH_POINT: 1407 cfg80211_leave_mesh(rdev, dev); 1408 break; 1409 case NL80211_IFTYPE_AP: 1410 case NL80211_IFTYPE_P2P_GO: 1411 cfg80211_stop_ap(rdev, dev, -1, true); 1412 break; 1413 case NL80211_IFTYPE_OCB: 1414 cfg80211_leave_ocb(rdev, dev); 1415 break; 1416 case NL80211_IFTYPE_P2P_DEVICE: 1417 case NL80211_IFTYPE_NAN: 1418 /* cannot happen, has no netdev */ 1419 break; 1420 case NL80211_IFTYPE_AP_VLAN: 1421 case NL80211_IFTYPE_MONITOR: 1422 /* nothing to do */ 1423 break; 1424 case NL80211_IFTYPE_UNSPECIFIED: 1425 case NL80211_IFTYPE_WDS: 1426 case NUM_NL80211_IFTYPES: 1427 /* invalid */ 1428 break; 1429 } 1430 } 1431 1432 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 1433 gfp_t gfp) 1434 { 1435 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1436 struct cfg80211_event *ev; 1437 unsigned long flags; 1438 1439 trace_cfg80211_stop_iface(wiphy, wdev); 1440 1441 ev = kzalloc(sizeof(*ev), gfp); 1442 if (!ev) 1443 return; 1444 1445 ev->type = EVENT_STOPPED; 1446 1447 spin_lock_irqsave(&wdev->event_lock, flags); 1448 list_add_tail(&ev->list, &wdev->event_list); 1449 spin_unlock_irqrestore(&wdev->event_lock, flags); 1450 queue_work(cfg80211_wq, &rdev->event_work); 1451 } 1452 EXPORT_SYMBOL(cfg80211_stop_iface); 1453 1454 void cfg80211_init_wdev(struct wireless_dev *wdev) 1455 { 1456 INIT_LIST_HEAD(&wdev->event_list); 1457 spin_lock_init(&wdev->event_lock); 1458 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1459 INIT_LIST_HEAD(&wdev->pmsr_list); 1460 spin_lock_init(&wdev->pmsr_lock); 1461 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk); 1462 1463 #ifdef CONFIG_CFG80211_WEXT 1464 wdev->wext.default_key = -1; 1465 wdev->wext.default_mgmt_key = -1; 1466 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1467 #endif 1468 1469 wiphy_work_init(&wdev->cqm_rssi_work, cfg80211_cqm_rssi_notify_work); 1470 1471 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1472 wdev->ps = true; 1473 else 1474 wdev->ps = false; 1475 /* allow mac80211 to determine the timeout */ 1476 wdev->ps_timeout = -1; 1477 1478 wdev->radio_mask = BIT(wdev->wiphy->n_radio) - 1; 1479 1480 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1481 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1482 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1483 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE; 1484 1485 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk); 1486 } 1487 1488 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev, 1489 struct wireless_dev *wdev) 1490 { 1491 ASSERT_RTNL(); 1492 lockdep_assert_held(&rdev->wiphy.mtx); 1493 1494 /* 1495 * We get here also when the interface changes network namespaces, 1496 * as it's registered into the new one, but we don't want it to 1497 * change ID in that case. Checking if the ID is already assigned 1498 * works, because 0 isn't considered a valid ID and the memory is 1499 * 0-initialized. 1500 */ 1501 if (!wdev->identifier) 1502 wdev->identifier = ++rdev->wdev_id; 1503 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list); 1504 rdev->devlist_generation++; 1505 wdev->registered = true; 1506 1507 if (wdev->netdev && 1508 sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj, 1509 "phy80211")) 1510 pr_err("failed to add phy80211 symlink to netdev!\n"); 1511 1512 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 1513 } 1514 1515 int cfg80211_register_netdevice(struct net_device *dev) 1516 { 1517 struct wireless_dev *wdev = dev->ieee80211_ptr; 1518 struct cfg80211_registered_device *rdev; 1519 int ret; 1520 1521 ASSERT_RTNL(); 1522 1523 if (WARN_ON(!wdev)) 1524 return -EINVAL; 1525 1526 rdev = wiphy_to_rdev(wdev->wiphy); 1527 1528 lockdep_assert_held(&rdev->wiphy.mtx); 1529 1530 /* we'll take care of this */ 1531 wdev->registered = true; 1532 wdev->registering = true; 1533 ret = register_netdevice(dev); 1534 if (ret) 1535 goto out; 1536 1537 cfg80211_register_wdev(rdev, wdev); 1538 ret = 0; 1539 out: 1540 wdev->registering = false; 1541 if (ret) 1542 wdev->registered = false; 1543 return ret; 1544 } 1545 EXPORT_SYMBOL(cfg80211_register_netdevice); 1546 1547 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 1548 unsigned long state, void *ptr) 1549 { 1550 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1551 struct wireless_dev *wdev = dev->ieee80211_ptr; 1552 struct cfg80211_registered_device *rdev; 1553 struct cfg80211_sched_scan_request *pos, *tmp; 1554 1555 if (!wdev) 1556 return NOTIFY_DONE; 1557 1558 rdev = wiphy_to_rdev(wdev->wiphy); 1559 1560 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 1561 1562 switch (state) { 1563 case NETDEV_POST_INIT: 1564 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 1565 wdev->netdev = dev; 1566 /* can only change netns with wiphy */ 1567 dev->netns_immutable = true; 1568 1569 cfg80211_init_wdev(wdev); 1570 break; 1571 case NETDEV_REGISTER: 1572 if (!wdev->registered) { 1573 guard(wiphy)(&rdev->wiphy); 1574 1575 cfg80211_register_wdev(rdev, wdev); 1576 } 1577 break; 1578 case NETDEV_UNREGISTER: 1579 /* 1580 * It is possible to get NETDEV_UNREGISTER multiple times, 1581 * so check wdev->registered. 1582 */ 1583 if (wdev->registered && !wdev->registering) { 1584 guard(wiphy)(&rdev->wiphy); 1585 1586 _cfg80211_unregister_wdev(wdev, false); 1587 } 1588 break; 1589 case NETDEV_GOING_DOWN: 1590 scoped_guard(wiphy, &rdev->wiphy) { 1591 cfg80211_leave(rdev, wdev); 1592 cfg80211_remove_links(wdev); 1593 } 1594 /* since we just did cfg80211_leave() nothing to do there */ 1595 cancel_work_sync(&wdev->disconnect_wk); 1596 cancel_work_sync(&wdev->pmsr_free_wk); 1597 break; 1598 case NETDEV_DOWN: 1599 wiphy_lock(&rdev->wiphy); 1600 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1601 if (rdev->scan_req && rdev->scan_req->req.wdev == wdev) { 1602 if (WARN_ON(!rdev->scan_req->notified && 1603 (!rdev->int_scan_req || 1604 !rdev->int_scan_req->notified))) 1605 rdev->scan_req->info.aborted = true; 1606 ___cfg80211_scan_done(rdev, false); 1607 } 1608 1609 list_for_each_entry_safe(pos, tmp, 1610 &rdev->sched_scan_req_list, list) { 1611 if (WARN_ON(pos->dev == wdev->netdev)) 1612 cfg80211_stop_sched_scan_req(rdev, pos, false); 1613 } 1614 1615 rdev->opencount--; 1616 wiphy_unlock(&rdev->wiphy); 1617 wake_up(&rdev->dev_wait); 1618 break; 1619 case NETDEV_UP: 1620 wiphy_lock(&rdev->wiphy); 1621 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1622 switch (wdev->iftype) { 1623 #ifdef CONFIG_CFG80211_WEXT 1624 case NL80211_IFTYPE_ADHOC: 1625 cfg80211_ibss_wext_join(rdev, wdev); 1626 break; 1627 case NL80211_IFTYPE_STATION: 1628 cfg80211_mgd_wext_connect(rdev, wdev); 1629 break; 1630 #endif 1631 #ifdef CONFIG_MAC80211_MESH 1632 case NL80211_IFTYPE_MESH_POINT: 1633 { 1634 /* backward compat code... */ 1635 struct mesh_setup setup; 1636 memcpy(&setup, &default_mesh_setup, 1637 sizeof(setup)); 1638 /* back compat only needed for mesh_id */ 1639 setup.mesh_id = wdev->u.mesh.id; 1640 setup.mesh_id_len = wdev->u.mesh.id_up_len; 1641 if (wdev->u.mesh.id_up_len) 1642 __cfg80211_join_mesh(rdev, dev, 1643 &setup, 1644 &default_mesh_config); 1645 break; 1646 } 1647 #endif 1648 default: 1649 break; 1650 } 1651 rdev->opencount++; 1652 1653 /* 1654 * Configure power management to the driver here so that its 1655 * correctly set also after interface type changes etc. 1656 */ 1657 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1658 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1659 rdev->ops->set_power_mgmt && 1660 rdev_set_power_mgmt(rdev, dev, wdev->ps, 1661 wdev->ps_timeout)) { 1662 /* assume this means it's off */ 1663 wdev->ps = false; 1664 } 1665 wiphy_unlock(&rdev->wiphy); 1666 break; 1667 case NETDEV_PRE_UP: 1668 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype, 1669 wdev->use_4addr, 0)) 1670 return notifier_from_errno(-EOPNOTSUPP); 1671 1672 if (rfkill_blocked(rdev->wiphy.rfkill)) 1673 return notifier_from_errno(-ERFKILL); 1674 break; 1675 default: 1676 return NOTIFY_DONE; 1677 } 1678 1679 wireless_nlevent_flush(); 1680 1681 return NOTIFY_OK; 1682 } 1683 1684 static struct notifier_block cfg80211_netdev_notifier = { 1685 .notifier_call = cfg80211_netdev_notifier_call, 1686 }; 1687 1688 static void __net_exit cfg80211_pernet_exit(struct net *net) 1689 { 1690 struct cfg80211_registered_device *rdev; 1691 1692 rtnl_lock(); 1693 for_each_rdev(rdev) { 1694 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1695 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1696 } 1697 rtnl_unlock(); 1698 } 1699 1700 static struct pernet_operations cfg80211_pernet_ops = { 1701 .exit = cfg80211_pernet_exit, 1702 }; 1703 1704 void wiphy_work_queue(struct wiphy *wiphy, struct wiphy_work *work) 1705 { 1706 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1707 unsigned long flags; 1708 1709 trace_wiphy_work_queue(wiphy, work); 1710 1711 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1712 if (list_empty(&work->entry)) 1713 list_add_tail(&work->entry, &rdev->wiphy_work_list); 1714 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1715 1716 queue_work(system_unbound_wq, &rdev->wiphy_work); 1717 } 1718 EXPORT_SYMBOL_GPL(wiphy_work_queue); 1719 1720 void wiphy_work_cancel(struct wiphy *wiphy, struct wiphy_work *work) 1721 { 1722 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1723 unsigned long flags; 1724 1725 lockdep_assert_held(&wiphy->mtx); 1726 1727 trace_wiphy_work_cancel(wiphy, work); 1728 1729 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1730 if (!list_empty(&work->entry)) 1731 list_del_init(&work->entry); 1732 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1733 } 1734 EXPORT_SYMBOL_GPL(wiphy_work_cancel); 1735 1736 void wiphy_work_flush(struct wiphy *wiphy, struct wiphy_work *work) 1737 { 1738 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1739 unsigned long flags; 1740 bool run; 1741 1742 trace_wiphy_work_flush(wiphy, work); 1743 1744 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1745 run = !work || !list_empty(&work->entry); 1746 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1747 1748 if (run) 1749 cfg80211_process_wiphy_works(rdev, work); 1750 } 1751 EXPORT_SYMBOL_GPL(wiphy_work_flush); 1752 1753 void wiphy_delayed_work_timer(struct timer_list *t) 1754 { 1755 struct wiphy_delayed_work *dwork = timer_container_of(dwork, t, timer); 1756 1757 wiphy_work_queue(dwork->wiphy, &dwork->work); 1758 } 1759 EXPORT_SYMBOL(wiphy_delayed_work_timer); 1760 1761 void wiphy_delayed_work_queue(struct wiphy *wiphy, 1762 struct wiphy_delayed_work *dwork, 1763 unsigned long delay) 1764 { 1765 trace_wiphy_delayed_work_queue(wiphy, &dwork->work, delay); 1766 1767 if (!delay) { 1768 timer_delete(&dwork->timer); 1769 wiphy_work_queue(wiphy, &dwork->work); 1770 return; 1771 } 1772 1773 dwork->wiphy = wiphy; 1774 mod_timer(&dwork->timer, jiffies + delay); 1775 } 1776 EXPORT_SYMBOL_GPL(wiphy_delayed_work_queue); 1777 1778 void wiphy_delayed_work_cancel(struct wiphy *wiphy, 1779 struct wiphy_delayed_work *dwork) 1780 { 1781 lockdep_assert_held(&wiphy->mtx); 1782 1783 timer_delete_sync(&dwork->timer); 1784 wiphy_work_cancel(wiphy, &dwork->work); 1785 } 1786 EXPORT_SYMBOL_GPL(wiphy_delayed_work_cancel); 1787 1788 void wiphy_delayed_work_flush(struct wiphy *wiphy, 1789 struct wiphy_delayed_work *dwork) 1790 { 1791 lockdep_assert_held(&wiphy->mtx); 1792 1793 timer_delete_sync(&dwork->timer); 1794 wiphy_work_flush(wiphy, &dwork->work); 1795 } 1796 EXPORT_SYMBOL_GPL(wiphy_delayed_work_flush); 1797 1798 bool wiphy_delayed_work_pending(struct wiphy *wiphy, 1799 struct wiphy_delayed_work *dwork) 1800 { 1801 return timer_pending(&dwork->timer); 1802 } 1803 EXPORT_SYMBOL_GPL(wiphy_delayed_work_pending); 1804 1805 enum hrtimer_restart wiphy_hrtimer_work_timer(struct hrtimer *t) 1806 { 1807 struct wiphy_hrtimer_work *hrwork = 1808 container_of(t, struct wiphy_hrtimer_work, timer); 1809 1810 wiphy_work_queue(hrwork->wiphy, &hrwork->work); 1811 1812 return HRTIMER_NORESTART; 1813 } 1814 EXPORT_SYMBOL_GPL(wiphy_hrtimer_work_timer); 1815 1816 void wiphy_hrtimer_work_queue(struct wiphy *wiphy, 1817 struct wiphy_hrtimer_work *hrwork, 1818 ktime_t delay) 1819 { 1820 trace_wiphy_hrtimer_work_queue(wiphy, &hrwork->work, delay); 1821 1822 if (!delay) { 1823 hrtimer_cancel(&hrwork->timer); 1824 wiphy_work_queue(wiphy, &hrwork->work); 1825 return; 1826 } 1827 1828 hrwork->wiphy = wiphy; 1829 hrtimer_start_range_ns(&hrwork->timer, delay, 1830 1000 * NSEC_PER_USEC, HRTIMER_MODE_REL); 1831 } 1832 EXPORT_SYMBOL_GPL(wiphy_hrtimer_work_queue); 1833 1834 void wiphy_hrtimer_work_cancel(struct wiphy *wiphy, 1835 struct wiphy_hrtimer_work *hrwork) 1836 { 1837 lockdep_assert_held(&wiphy->mtx); 1838 1839 hrtimer_cancel(&hrwork->timer); 1840 wiphy_work_cancel(wiphy, &hrwork->work); 1841 } 1842 EXPORT_SYMBOL_GPL(wiphy_hrtimer_work_cancel); 1843 1844 void wiphy_hrtimer_work_flush(struct wiphy *wiphy, 1845 struct wiphy_hrtimer_work *hrwork) 1846 { 1847 lockdep_assert_held(&wiphy->mtx); 1848 1849 hrtimer_cancel(&hrwork->timer); 1850 wiphy_work_flush(wiphy, &hrwork->work); 1851 } 1852 EXPORT_SYMBOL_GPL(wiphy_hrtimer_work_flush); 1853 1854 bool wiphy_hrtimer_work_pending(struct wiphy *wiphy, 1855 struct wiphy_hrtimer_work *hrwork) 1856 { 1857 return hrtimer_is_queued(&hrwork->timer); 1858 } 1859 EXPORT_SYMBOL_GPL(wiphy_hrtimer_work_pending); 1860 1861 static int __init cfg80211_init(void) 1862 { 1863 int err; 1864 1865 err = register_pernet_device(&cfg80211_pernet_ops); 1866 if (err) 1867 goto out_fail_pernet; 1868 1869 err = wiphy_sysfs_init(); 1870 if (err) 1871 goto out_fail_sysfs; 1872 1873 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1874 if (err) 1875 goto out_fail_notifier; 1876 1877 err = nl80211_init(); 1878 if (err) 1879 goto out_fail_nl80211; 1880 1881 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1882 1883 err = regulatory_init(); 1884 if (err) 1885 goto out_fail_reg; 1886 1887 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM); 1888 if (!cfg80211_wq) { 1889 err = -ENOMEM; 1890 goto out_fail_wq; 1891 } 1892 1893 return 0; 1894 1895 out_fail_wq: 1896 regulatory_exit(); 1897 out_fail_reg: 1898 debugfs_remove(ieee80211_debugfs_dir); 1899 nl80211_exit(); 1900 out_fail_nl80211: 1901 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1902 out_fail_notifier: 1903 wiphy_sysfs_exit(); 1904 out_fail_sysfs: 1905 unregister_pernet_device(&cfg80211_pernet_ops); 1906 out_fail_pernet: 1907 return err; 1908 } 1909 fs_initcall(cfg80211_init); 1910 1911 static void __exit cfg80211_exit(void) 1912 { 1913 debugfs_remove(ieee80211_debugfs_dir); 1914 nl80211_exit(); 1915 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1916 wiphy_sysfs_exit(); 1917 regulatory_exit(); 1918 unregister_pernet_device(&cfg80211_pernet_ops); 1919 destroy_workqueue(cfg80211_wq); 1920 } 1921 module_exit(cfg80211_exit); 1922