1 /* 2 * This is the linux wireless configuration interface. 3 * 4 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net> 5 * Copyright 2013-2014 Intel Mobile Communications GmbH 6 * Copyright 2015 Intel Deutschland GmbH 7 */ 8 9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 10 11 #include <linux/if.h> 12 #include <linux/module.h> 13 #include <linux/err.h> 14 #include <linux/list.h> 15 #include <linux/slab.h> 16 #include <linux/nl80211.h> 17 #include <linux/debugfs.h> 18 #include <linux/notifier.h> 19 #include <linux/device.h> 20 #include <linux/etherdevice.h> 21 #include <linux/rtnetlink.h> 22 #include <linux/sched.h> 23 #include <net/genetlink.h> 24 #include <net/cfg80211.h> 25 #include "nl80211.h" 26 #include "core.h" 27 #include "sysfs.h" 28 #include "debugfs.h" 29 #include "wext-compat.h" 30 #include "rdev-ops.h" 31 32 /* name for sysfs, %d is appended */ 33 #define PHY_NAME "phy" 34 35 MODULE_AUTHOR("Johannes Berg"); 36 MODULE_LICENSE("GPL"); 37 MODULE_DESCRIPTION("wireless configuration support"); 38 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME); 39 40 /* RCU-protected (and RTNL for writers) */ 41 LIST_HEAD(cfg80211_rdev_list); 42 int cfg80211_rdev_list_generation; 43 44 /* for debugfs */ 45 static struct dentry *ieee80211_debugfs_dir; 46 47 /* for the cleanup, scan and event works */ 48 struct workqueue_struct *cfg80211_wq; 49 50 static bool cfg80211_disable_40mhz_24ghz; 51 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644); 52 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz, 53 "Disable 40MHz support in the 2.4GHz band"); 54 55 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx) 56 { 57 struct cfg80211_registered_device *result = NULL, *rdev; 58 59 ASSERT_RTNL(); 60 61 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 62 if (rdev->wiphy_idx == wiphy_idx) { 63 result = rdev; 64 break; 65 } 66 } 67 68 return result; 69 } 70 71 int get_wiphy_idx(struct wiphy *wiphy) 72 { 73 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 74 75 return rdev->wiphy_idx; 76 } 77 78 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx) 79 { 80 struct cfg80211_registered_device *rdev; 81 82 ASSERT_RTNL(); 83 84 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx); 85 if (!rdev) 86 return NULL; 87 return &rdev->wiphy; 88 } 89 90 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev, 91 const char *newname) 92 { 93 struct cfg80211_registered_device *rdev2; 94 int wiphy_idx, taken = -1, digits; 95 96 ASSERT_RTNL(); 97 98 /* prohibit calling the thing phy%d when %d is not its number */ 99 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken); 100 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) { 101 /* count number of places needed to print wiphy_idx */ 102 digits = 1; 103 while (wiphy_idx /= 10) 104 digits++; 105 /* 106 * deny the name if it is phy<idx> where <idx> is printed 107 * without leading zeroes. taken == strlen(newname) here 108 */ 109 if (taken == strlen(PHY_NAME) + digits) 110 return -EINVAL; 111 } 112 113 /* Ensure another device does not already have this name. */ 114 list_for_each_entry(rdev2, &cfg80211_rdev_list, list) 115 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0) 116 return -EINVAL; 117 118 return 0; 119 } 120 121 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, 122 char *newname) 123 { 124 int result; 125 126 ASSERT_RTNL(); 127 128 /* Ignore nop renames */ 129 if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0) 130 return 0; 131 132 result = cfg80211_dev_check_name(rdev, newname); 133 if (result < 0) 134 return result; 135 136 result = device_rename(&rdev->wiphy.dev, newname); 137 if (result) 138 return result; 139 140 if (rdev->wiphy.debugfsdir && 141 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent, 142 rdev->wiphy.debugfsdir, 143 rdev->wiphy.debugfsdir->d_parent, 144 newname)) 145 pr_err("failed to rename debugfs dir to %s!\n", newname); 146 147 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 148 149 return 0; 150 } 151 152 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, 153 struct net *net) 154 { 155 struct wireless_dev *wdev; 156 int err = 0; 157 158 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK)) 159 return -EOPNOTSUPP; 160 161 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 162 if (!wdev->netdev) 163 continue; 164 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 165 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); 166 if (err) 167 break; 168 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 169 } 170 171 if (err) { 172 /* failed -- clean up to old netns */ 173 net = wiphy_net(&rdev->wiphy); 174 175 list_for_each_entry_continue_reverse(wdev, 176 &rdev->wiphy.wdev_list, 177 list) { 178 if (!wdev->netdev) 179 continue; 180 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 181 err = dev_change_net_namespace(wdev->netdev, net, 182 "wlan%d"); 183 WARN_ON(err); 184 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 185 } 186 187 return err; 188 } 189 190 wiphy_net_set(&rdev->wiphy, net); 191 192 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev)); 193 WARN_ON(err); 194 195 return 0; 196 } 197 198 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data) 199 { 200 struct cfg80211_registered_device *rdev = data; 201 202 rdev_rfkill_poll(rdev); 203 } 204 205 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev, 206 struct wireless_dev *wdev) 207 { 208 ASSERT_RTNL(); 209 210 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE)) 211 return; 212 213 if (!wdev->p2p_started) 214 return; 215 216 rdev_stop_p2p_device(rdev, wdev); 217 wdev->p2p_started = false; 218 219 rdev->opencount--; 220 221 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 222 if (WARN_ON(!rdev->scan_req->notified)) 223 rdev->scan_req->info.aborted = true; 224 ___cfg80211_scan_done(rdev, false); 225 } 226 } 227 228 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev, 229 struct wireless_dev *wdev) 230 { 231 ASSERT_RTNL(); 232 233 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN)) 234 return; 235 236 if (!wdev->nan_started) 237 return; 238 239 rdev_stop_nan(rdev, wdev); 240 wdev->nan_started = false; 241 242 rdev->opencount--; 243 } 244 245 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy) 246 { 247 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 248 struct wireless_dev *wdev; 249 250 ASSERT_RTNL(); 251 252 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 253 if (wdev->netdev) { 254 dev_close(wdev->netdev); 255 continue; 256 } 257 /* otherwise, check iftype */ 258 switch (wdev->iftype) { 259 case NL80211_IFTYPE_P2P_DEVICE: 260 cfg80211_stop_p2p_device(rdev, wdev); 261 break; 262 case NL80211_IFTYPE_NAN: 263 cfg80211_stop_nan(rdev, wdev); 264 break; 265 default: 266 break; 267 } 268 } 269 } 270 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces); 271 272 static int cfg80211_rfkill_set_block(void *data, bool blocked) 273 { 274 struct cfg80211_registered_device *rdev = data; 275 276 if (!blocked) 277 return 0; 278 279 rtnl_lock(); 280 cfg80211_shutdown_all_interfaces(&rdev->wiphy); 281 rtnl_unlock(); 282 283 return 0; 284 } 285 286 static void cfg80211_rfkill_sync_work(struct work_struct *work) 287 { 288 struct cfg80211_registered_device *rdev; 289 290 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync); 291 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill)); 292 } 293 294 static void cfg80211_event_work(struct work_struct *work) 295 { 296 struct cfg80211_registered_device *rdev; 297 298 rdev = container_of(work, struct cfg80211_registered_device, 299 event_work); 300 301 rtnl_lock(); 302 cfg80211_process_rdev_events(rdev); 303 rtnl_unlock(); 304 } 305 306 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev) 307 { 308 struct cfg80211_iface_destroy *item; 309 310 ASSERT_RTNL(); 311 312 spin_lock_irq(&rdev->destroy_list_lock); 313 while ((item = list_first_entry_or_null(&rdev->destroy_list, 314 struct cfg80211_iface_destroy, 315 list))) { 316 struct wireless_dev *wdev, *tmp; 317 u32 nlportid = item->nlportid; 318 319 list_del(&item->list); 320 kfree(item); 321 spin_unlock_irq(&rdev->destroy_list_lock); 322 323 list_for_each_entry_safe(wdev, tmp, 324 &rdev->wiphy.wdev_list, list) { 325 if (nlportid == wdev->owner_nlportid) 326 rdev_del_virtual_intf(rdev, wdev); 327 } 328 329 spin_lock_irq(&rdev->destroy_list_lock); 330 } 331 spin_unlock_irq(&rdev->destroy_list_lock); 332 } 333 334 static void cfg80211_destroy_iface_wk(struct work_struct *work) 335 { 336 struct cfg80211_registered_device *rdev; 337 338 rdev = container_of(work, struct cfg80211_registered_device, 339 destroy_work); 340 341 rtnl_lock(); 342 cfg80211_destroy_ifaces(rdev); 343 rtnl_unlock(); 344 } 345 346 static void cfg80211_sched_scan_stop_wk(struct work_struct *work) 347 { 348 struct cfg80211_registered_device *rdev; 349 350 rdev = container_of(work, struct cfg80211_registered_device, 351 sched_scan_stop_wk); 352 353 rtnl_lock(); 354 355 __cfg80211_stop_sched_scan(rdev, false); 356 357 rtnl_unlock(); 358 } 359 360 /* exported functions */ 361 362 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, 363 const char *requested_name) 364 { 365 static atomic_t wiphy_counter = ATOMIC_INIT(0); 366 367 struct cfg80211_registered_device *rdev; 368 int alloc_size; 369 370 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 371 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 372 WARN_ON(ops->connect && !ops->disconnect); 373 WARN_ON(ops->join_ibss && !ops->leave_ibss); 374 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 375 WARN_ON(ops->add_station && !ops->del_station); 376 WARN_ON(ops->add_mpath && !ops->del_mpath); 377 WARN_ON(ops->join_mesh && !ops->leave_mesh); 378 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device); 379 WARN_ON(ops->start_ap && !ops->stop_ap); 380 WARN_ON(ops->join_ocb && !ops->leave_ocb); 381 WARN_ON(ops->suspend && !ops->resume); 382 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop); 383 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel); 384 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch); 385 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts); 386 387 alloc_size = sizeof(*rdev) + sizeof_priv; 388 389 rdev = kzalloc(alloc_size, GFP_KERNEL); 390 if (!rdev) 391 return NULL; 392 393 rdev->ops = ops; 394 395 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 396 397 if (unlikely(rdev->wiphy_idx < 0)) { 398 /* ugh, wrapped! */ 399 atomic_dec(&wiphy_counter); 400 kfree(rdev); 401 return NULL; 402 } 403 404 /* atomic_inc_return makes it start at 1, make it start at 0 */ 405 rdev->wiphy_idx--; 406 407 /* give it a proper name */ 408 if (requested_name && requested_name[0]) { 409 int rv; 410 411 rtnl_lock(); 412 rv = cfg80211_dev_check_name(rdev, requested_name); 413 414 if (rv < 0) { 415 rtnl_unlock(); 416 goto use_default_name; 417 } 418 419 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); 420 rtnl_unlock(); 421 if (rv) 422 goto use_default_name; 423 } else { 424 use_default_name: 425 /* NOTE: This is *probably* safe w/out holding rtnl because of 426 * the restrictions on phy names. Probably this call could 427 * fail if some other part of the kernel (re)named a device 428 * phyX. But, might should add some locking and check return 429 * value, and use a different name if this one exists? 430 */ 431 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 432 } 433 434 INIT_LIST_HEAD(&rdev->wiphy.wdev_list); 435 INIT_LIST_HEAD(&rdev->beacon_registrations); 436 spin_lock_init(&rdev->beacon_registrations_lock); 437 spin_lock_init(&rdev->bss_lock); 438 INIT_LIST_HEAD(&rdev->bss_list); 439 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 440 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results); 441 INIT_LIST_HEAD(&rdev->mlme_unreg); 442 spin_lock_init(&rdev->mlme_unreg_lock); 443 INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk); 444 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 445 cfg80211_dfs_channels_update_work); 446 #ifdef CONFIG_CFG80211_WEXT 447 rdev->wiphy.wext = &cfg80211_wext_handler; 448 #endif 449 450 device_initialize(&rdev->wiphy.dev); 451 rdev->wiphy.dev.class = &ieee80211_class; 452 rdev->wiphy.dev.platform_data = rdev; 453 device_enable_async_suspend(&rdev->wiphy.dev); 454 455 INIT_LIST_HEAD(&rdev->destroy_list); 456 spin_lock_init(&rdev->destroy_list_lock); 457 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 458 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 459 460 #ifdef CONFIG_CFG80211_DEFAULT_PS 461 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 462 #endif 463 464 wiphy_net_set(&rdev->wiphy, &init_net); 465 466 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 467 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 468 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 469 &rdev->rfkill_ops, rdev); 470 471 if (!rdev->rfkill) { 472 kfree(rdev); 473 return NULL; 474 } 475 476 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); 477 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 478 INIT_WORK(&rdev->event_work, cfg80211_event_work); 479 480 init_waitqueue_head(&rdev->dev_wait); 481 482 /* 483 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 484 * Fragmentation and RTS threshold are disabled by default with the 485 * special -1 value. 486 */ 487 rdev->wiphy.retry_short = 7; 488 rdev->wiphy.retry_long = 4; 489 rdev->wiphy.frag_threshold = (u32) -1; 490 rdev->wiphy.rts_threshold = (u32) -1; 491 rdev->wiphy.coverage_class = 0; 492 493 rdev->wiphy.max_num_csa_counters = 1; 494 495 rdev->wiphy.max_sched_scan_plans = 1; 496 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 497 498 return &rdev->wiphy; 499 } 500 EXPORT_SYMBOL(wiphy_new_nm); 501 502 static int wiphy_verify_combinations(struct wiphy *wiphy) 503 { 504 const struct ieee80211_iface_combination *c; 505 int i, j; 506 507 for (i = 0; i < wiphy->n_iface_combinations; i++) { 508 u32 cnt = 0; 509 u16 all_iftypes = 0; 510 511 c = &wiphy->iface_combinations[i]; 512 513 /* 514 * Combinations with just one interface aren't real, 515 * however we make an exception for DFS. 516 */ 517 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 518 return -EINVAL; 519 520 /* Need at least one channel */ 521 if (WARN_ON(!c->num_different_channels)) 522 return -EINVAL; 523 524 /* 525 * Put a sane limit on maximum number of different 526 * channels to simplify channel accounting code. 527 */ 528 if (WARN_ON(c->num_different_channels > 529 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 530 return -EINVAL; 531 532 /* DFS only works on one channel. */ 533 if (WARN_ON(c->radar_detect_widths && 534 (c->num_different_channels > 1))) 535 return -EINVAL; 536 537 if (WARN_ON(!c->n_limits)) 538 return -EINVAL; 539 540 for (j = 0; j < c->n_limits; j++) { 541 u16 types = c->limits[j].types; 542 543 /* interface types shouldn't overlap */ 544 if (WARN_ON(types & all_iftypes)) 545 return -EINVAL; 546 all_iftypes |= types; 547 548 if (WARN_ON(!c->limits[j].max)) 549 return -EINVAL; 550 551 /* Shouldn't list software iftypes in combinations! */ 552 if (WARN_ON(wiphy->software_iftypes & types)) 553 return -EINVAL; 554 555 /* Only a single P2P_DEVICE can be allowed */ 556 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 557 c->limits[j].max > 1)) 558 return -EINVAL; 559 560 /* Only a single NAN can be allowed */ 561 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) && 562 c->limits[j].max > 1)) 563 return -EINVAL; 564 565 cnt += c->limits[j].max; 566 /* 567 * Don't advertise an unsupported type 568 * in a combination. 569 */ 570 if (WARN_ON((wiphy->interface_modes & types) != types)) 571 return -EINVAL; 572 } 573 574 /* You can't even choose that many! */ 575 if (WARN_ON(cnt < c->max_interfaces)) 576 return -EINVAL; 577 } 578 579 return 0; 580 } 581 582 int wiphy_register(struct wiphy *wiphy) 583 { 584 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 585 int res; 586 enum nl80211_band band; 587 struct ieee80211_supported_band *sband; 588 bool have_band = false; 589 int i; 590 u16 ifmodes = wiphy->interface_modes; 591 592 #ifdef CONFIG_PM 593 if (WARN_ON(wiphy->wowlan && 594 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 595 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 596 return -EINVAL; 597 if (WARN_ON(wiphy->wowlan && 598 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 599 !wiphy->wowlan->tcp)) 600 return -EINVAL; 601 #endif 602 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 603 (!rdev->ops->tdls_channel_switch || 604 !rdev->ops->tdls_cancel_channel_switch))) 605 return -EINVAL; 606 607 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) && 608 (!rdev->ops->start_nan || !rdev->ops->stop_nan || 609 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func))) 610 return -EINVAL; 611 612 /* 613 * if a wiphy has unsupported modes for regulatory channel enforcement, 614 * opt-out of enforcement checking 615 */ 616 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) | 617 BIT(NL80211_IFTYPE_P2P_CLIENT) | 618 BIT(NL80211_IFTYPE_AP) | 619 BIT(NL80211_IFTYPE_P2P_GO) | 620 BIT(NL80211_IFTYPE_ADHOC) | 621 BIT(NL80211_IFTYPE_P2P_DEVICE) | 622 BIT(NL80211_IFTYPE_NAN) | 623 BIT(NL80211_IFTYPE_AP_VLAN) | 624 BIT(NL80211_IFTYPE_MONITOR))) 625 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF; 626 627 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 628 (wiphy->regulatory_flags & 629 (REGULATORY_CUSTOM_REG | 630 REGULATORY_STRICT_REG | 631 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 632 REGULATORY_COUNTRY_IE_IGNORE)))) 633 return -EINVAL; 634 635 if (WARN_ON(wiphy->coalesce && 636 (!wiphy->coalesce->n_rules || 637 !wiphy->coalesce->n_patterns) && 638 (!wiphy->coalesce->pattern_min_len || 639 wiphy->coalesce->pattern_min_len > 640 wiphy->coalesce->pattern_max_len))) 641 return -EINVAL; 642 643 if (WARN_ON(wiphy->ap_sme_capa && 644 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 645 return -EINVAL; 646 647 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 648 return -EINVAL; 649 650 if (WARN_ON(wiphy->addresses && 651 !is_zero_ether_addr(wiphy->perm_addr) && 652 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 653 ETH_ALEN))) 654 return -EINVAL; 655 656 if (WARN_ON(wiphy->max_acl_mac_addrs && 657 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 658 !rdev->ops->set_mac_acl))) 659 return -EINVAL; 660 661 /* assure only valid behaviours are flagged by driver 662 * hence subtract 2 as bit 0 is invalid. 663 */ 664 if (WARN_ON(wiphy->bss_select_support && 665 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 666 return -EINVAL; 667 668 if (wiphy->addresses) 669 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 670 671 /* sanity check ifmodes */ 672 WARN_ON(!ifmodes); 673 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 674 if (WARN_ON(ifmodes != wiphy->interface_modes)) 675 wiphy->interface_modes = ifmodes; 676 677 res = wiphy_verify_combinations(wiphy); 678 if (res) 679 return res; 680 681 /* sanity check supported bands/channels */ 682 for (band = 0; band < NUM_NL80211_BANDS; band++) { 683 sband = wiphy->bands[band]; 684 if (!sband) 685 continue; 686 687 sband->band = band; 688 if (WARN_ON(!sband->n_channels)) 689 return -EINVAL; 690 /* 691 * on 60GHz band, there are no legacy rates, so 692 * n_bitrates is 0 693 */ 694 if (WARN_ON(band != NL80211_BAND_60GHZ && 695 !sband->n_bitrates)) 696 return -EINVAL; 697 698 /* 699 * Since cfg80211_disable_40mhz_24ghz is global, we can 700 * modify the sband's ht data even if the driver uses a 701 * global structure for that. 702 */ 703 if (cfg80211_disable_40mhz_24ghz && 704 band == NL80211_BAND_2GHZ && 705 sband->ht_cap.ht_supported) { 706 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 707 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 708 } 709 710 /* 711 * Since we use a u32 for rate bitmaps in 712 * ieee80211_get_response_rate, we cannot 713 * have more than 32 legacy rates. 714 */ 715 if (WARN_ON(sband->n_bitrates > 32)) 716 return -EINVAL; 717 718 for (i = 0; i < sband->n_channels; i++) { 719 sband->channels[i].orig_flags = 720 sband->channels[i].flags; 721 sband->channels[i].orig_mag = INT_MAX; 722 sband->channels[i].orig_mpwr = 723 sband->channels[i].max_power; 724 sband->channels[i].band = band; 725 } 726 727 have_band = true; 728 } 729 730 if (!have_band) { 731 WARN_ON(1); 732 return -EINVAL; 733 } 734 735 #ifdef CONFIG_PM 736 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 737 (!rdev->wiphy.wowlan->pattern_min_len || 738 rdev->wiphy.wowlan->pattern_min_len > 739 rdev->wiphy.wowlan->pattern_max_len))) 740 return -EINVAL; 741 #endif 742 743 /* check and set up bitrates */ 744 ieee80211_set_bitrate_flags(wiphy); 745 746 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 747 748 rtnl_lock(); 749 res = device_add(&rdev->wiphy.dev); 750 if (res) { 751 rtnl_unlock(); 752 return res; 753 } 754 755 /* set up regulatory info */ 756 wiphy_regulatory_register(wiphy); 757 758 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 759 cfg80211_rdev_list_generation++; 760 761 /* add to debugfs */ 762 rdev->wiphy.debugfsdir = 763 debugfs_create_dir(wiphy_name(&rdev->wiphy), 764 ieee80211_debugfs_dir); 765 if (IS_ERR(rdev->wiphy.debugfsdir)) 766 rdev->wiphy.debugfsdir = NULL; 767 768 cfg80211_debugfs_rdev_add(rdev); 769 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 770 771 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 772 struct regulatory_request request; 773 774 request.wiphy_idx = get_wiphy_idx(wiphy); 775 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 776 request.alpha2[0] = '9'; 777 request.alpha2[1] = '9'; 778 779 nl80211_send_reg_change_event(&request); 780 } 781 782 /* Check that nobody globally advertises any capabilities they do not 783 * advertise on all possible interface types. 784 */ 785 if (wiphy->extended_capabilities_len && 786 wiphy->num_iftype_ext_capab && 787 wiphy->iftype_ext_capab) { 788 u8 supported_on_all, j; 789 const struct wiphy_iftype_ext_capab *capab; 790 791 capab = wiphy->iftype_ext_capab; 792 for (j = 0; j < wiphy->extended_capabilities_len; j++) { 793 if (capab[0].extended_capabilities_len > j) 794 supported_on_all = 795 capab[0].extended_capabilities[j]; 796 else 797 supported_on_all = 0x00; 798 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) { 799 if (j >= capab[i].extended_capabilities_len) { 800 supported_on_all = 0x00; 801 break; 802 } 803 supported_on_all &= 804 capab[i].extended_capabilities[j]; 805 } 806 if (WARN_ON(wiphy->extended_capabilities[j] & 807 ~supported_on_all)) 808 break; 809 } 810 } 811 812 rdev->wiphy.registered = true; 813 rtnl_unlock(); 814 815 res = rfkill_register(rdev->rfkill); 816 if (res) { 817 rfkill_destroy(rdev->rfkill); 818 rdev->rfkill = NULL; 819 wiphy_unregister(&rdev->wiphy); 820 return res; 821 } 822 823 return 0; 824 } 825 EXPORT_SYMBOL(wiphy_register); 826 827 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 828 { 829 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 830 831 if (!rdev->ops->rfkill_poll) 832 return; 833 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 834 rfkill_resume_polling(rdev->rfkill); 835 } 836 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 837 838 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 839 { 840 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 841 842 rfkill_pause_polling(rdev->rfkill); 843 } 844 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 845 846 void wiphy_unregister(struct wiphy *wiphy) 847 { 848 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 849 850 wait_event(rdev->dev_wait, ({ 851 int __count; 852 rtnl_lock(); 853 __count = rdev->opencount; 854 rtnl_unlock(); 855 __count == 0; })); 856 857 if (rdev->rfkill) 858 rfkill_unregister(rdev->rfkill); 859 860 rtnl_lock(); 861 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 862 rdev->wiphy.registered = false; 863 864 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 865 866 /* 867 * First remove the hardware from everywhere, this makes 868 * it impossible to find from userspace. 869 */ 870 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 871 list_del_rcu(&rdev->list); 872 synchronize_rcu(); 873 874 /* 875 * If this device got a regulatory hint tell core its 876 * free to listen now to a new shiny device regulatory hint 877 */ 878 wiphy_regulatory_deregister(wiphy); 879 880 cfg80211_rdev_list_generation++; 881 device_del(&rdev->wiphy.dev); 882 883 rtnl_unlock(); 884 885 flush_work(&rdev->scan_done_wk); 886 cancel_work_sync(&rdev->conn_work); 887 flush_work(&rdev->event_work); 888 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 889 flush_work(&rdev->destroy_work); 890 flush_work(&rdev->sched_scan_stop_wk); 891 flush_work(&rdev->mlme_unreg_wk); 892 893 #ifdef CONFIG_PM 894 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 895 rdev_set_wakeup(rdev, false); 896 #endif 897 cfg80211_rdev_free_wowlan(rdev); 898 cfg80211_rdev_free_coalesce(rdev); 899 } 900 EXPORT_SYMBOL(wiphy_unregister); 901 902 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 903 { 904 struct cfg80211_internal_bss *scan, *tmp; 905 struct cfg80211_beacon_registration *reg, *treg; 906 rfkill_destroy(rdev->rfkill); 907 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 908 list_del(®->list); 909 kfree(reg); 910 } 911 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 912 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 913 kfree(rdev); 914 } 915 916 void wiphy_free(struct wiphy *wiphy) 917 { 918 put_device(&wiphy->dev); 919 } 920 EXPORT_SYMBOL(wiphy_free); 921 922 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 923 { 924 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 925 926 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 927 schedule_work(&rdev->rfkill_sync); 928 } 929 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 930 931 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 932 { 933 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 934 935 ASSERT_RTNL(); 936 937 if (WARN_ON(wdev->netdev)) 938 return; 939 940 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 941 942 list_del_rcu(&wdev->list); 943 rdev->devlist_generation++; 944 945 switch (wdev->iftype) { 946 case NL80211_IFTYPE_P2P_DEVICE: 947 cfg80211_mlme_purge_registrations(wdev); 948 cfg80211_stop_p2p_device(rdev, wdev); 949 break; 950 case NL80211_IFTYPE_NAN: 951 cfg80211_stop_nan(rdev, wdev); 952 break; 953 default: 954 WARN_ON_ONCE(1); 955 break; 956 } 957 } 958 EXPORT_SYMBOL(cfg80211_unregister_wdev); 959 960 static const struct device_type wiphy_type = { 961 .name = "wlan", 962 }; 963 964 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 965 enum nl80211_iftype iftype, int num) 966 { 967 ASSERT_RTNL(); 968 969 rdev->num_running_ifaces += num; 970 if (iftype == NL80211_IFTYPE_MONITOR) 971 rdev->num_running_monitor_ifaces += num; 972 } 973 974 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 975 struct wireless_dev *wdev) 976 { 977 struct net_device *dev = wdev->netdev; 978 struct cfg80211_sched_scan_request *sched_scan_req; 979 980 ASSERT_RTNL(); 981 ASSERT_WDEV_LOCK(wdev); 982 983 switch (wdev->iftype) { 984 case NL80211_IFTYPE_ADHOC: 985 __cfg80211_leave_ibss(rdev, dev, true); 986 break; 987 case NL80211_IFTYPE_P2P_CLIENT: 988 case NL80211_IFTYPE_STATION: 989 sched_scan_req = rtnl_dereference(rdev->sched_scan_req); 990 if (sched_scan_req && dev == sched_scan_req->dev) 991 __cfg80211_stop_sched_scan(rdev, false); 992 993 #ifdef CONFIG_CFG80211_WEXT 994 kfree(wdev->wext.ie); 995 wdev->wext.ie = NULL; 996 wdev->wext.ie_len = 0; 997 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 998 #endif 999 cfg80211_disconnect(rdev, dev, 1000 WLAN_REASON_DEAUTH_LEAVING, true); 1001 break; 1002 case NL80211_IFTYPE_MESH_POINT: 1003 __cfg80211_leave_mesh(rdev, dev); 1004 break; 1005 case NL80211_IFTYPE_AP: 1006 case NL80211_IFTYPE_P2P_GO: 1007 __cfg80211_stop_ap(rdev, dev, true); 1008 break; 1009 case NL80211_IFTYPE_OCB: 1010 __cfg80211_leave_ocb(rdev, dev); 1011 break; 1012 case NL80211_IFTYPE_WDS: 1013 /* must be handled by mac80211/driver, has no APIs */ 1014 break; 1015 case NL80211_IFTYPE_P2P_DEVICE: 1016 case NL80211_IFTYPE_NAN: 1017 /* cannot happen, has no netdev */ 1018 break; 1019 case NL80211_IFTYPE_AP_VLAN: 1020 case NL80211_IFTYPE_MONITOR: 1021 /* nothing to do */ 1022 break; 1023 case NL80211_IFTYPE_UNSPECIFIED: 1024 case NUM_NL80211_IFTYPES: 1025 /* invalid */ 1026 break; 1027 } 1028 } 1029 1030 void cfg80211_leave(struct cfg80211_registered_device *rdev, 1031 struct wireless_dev *wdev) 1032 { 1033 wdev_lock(wdev); 1034 __cfg80211_leave(rdev, wdev); 1035 wdev_unlock(wdev); 1036 } 1037 1038 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 1039 gfp_t gfp) 1040 { 1041 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1042 struct cfg80211_event *ev; 1043 unsigned long flags; 1044 1045 trace_cfg80211_stop_iface(wiphy, wdev); 1046 1047 ev = kzalloc(sizeof(*ev), gfp); 1048 if (!ev) 1049 return; 1050 1051 ev->type = EVENT_STOPPED; 1052 1053 spin_lock_irqsave(&wdev->event_lock, flags); 1054 list_add_tail(&ev->list, &wdev->event_list); 1055 spin_unlock_irqrestore(&wdev->event_lock, flags); 1056 queue_work(cfg80211_wq, &rdev->event_work); 1057 } 1058 EXPORT_SYMBOL(cfg80211_stop_iface); 1059 1060 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 1061 unsigned long state, void *ptr) 1062 { 1063 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1064 struct wireless_dev *wdev = dev->ieee80211_ptr; 1065 struct cfg80211_registered_device *rdev; 1066 struct cfg80211_sched_scan_request *sched_scan_req; 1067 1068 if (!wdev) 1069 return NOTIFY_DONE; 1070 1071 rdev = wiphy_to_rdev(wdev->wiphy); 1072 1073 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 1074 1075 switch (state) { 1076 case NETDEV_POST_INIT: 1077 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 1078 break; 1079 case NETDEV_REGISTER: 1080 /* 1081 * NB: cannot take rdev->mtx here because this may be 1082 * called within code protected by it when interfaces 1083 * are added with nl80211. 1084 */ 1085 mutex_init(&wdev->mtx); 1086 INIT_LIST_HEAD(&wdev->event_list); 1087 spin_lock_init(&wdev->event_lock); 1088 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1089 spin_lock_init(&wdev->mgmt_registrations_lock); 1090 1091 wdev->identifier = ++rdev->wdev_id; 1092 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list); 1093 rdev->devlist_generation++; 1094 /* can only change netns with wiphy */ 1095 dev->features |= NETIF_F_NETNS_LOCAL; 1096 1097 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 1098 "phy80211")) { 1099 pr_err("failed to add phy80211 symlink to netdev!\n"); 1100 } 1101 wdev->netdev = dev; 1102 #ifdef CONFIG_CFG80211_WEXT 1103 wdev->wext.default_key = -1; 1104 wdev->wext.default_mgmt_key = -1; 1105 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1106 #endif 1107 1108 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1109 wdev->ps = true; 1110 else 1111 wdev->ps = false; 1112 /* allow mac80211 to determine the timeout */ 1113 wdev->ps_timeout = -1; 1114 1115 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1116 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1117 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1118 dev->priv_flags |= IFF_DONT_BRIDGE; 1119 1120 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 1121 break; 1122 case NETDEV_GOING_DOWN: 1123 cfg80211_leave(rdev, wdev); 1124 break; 1125 case NETDEV_DOWN: 1126 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1127 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1128 if (WARN_ON(!rdev->scan_req->notified)) 1129 rdev->scan_req->info.aborted = true; 1130 ___cfg80211_scan_done(rdev, false); 1131 } 1132 1133 sched_scan_req = rtnl_dereference(rdev->sched_scan_req); 1134 if (WARN_ON(sched_scan_req && 1135 sched_scan_req->dev == wdev->netdev)) { 1136 __cfg80211_stop_sched_scan(rdev, false); 1137 } 1138 1139 rdev->opencount--; 1140 wake_up(&rdev->dev_wait); 1141 break; 1142 case NETDEV_UP: 1143 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1144 wdev_lock(wdev); 1145 switch (wdev->iftype) { 1146 #ifdef CONFIG_CFG80211_WEXT 1147 case NL80211_IFTYPE_ADHOC: 1148 cfg80211_ibss_wext_join(rdev, wdev); 1149 break; 1150 case NL80211_IFTYPE_STATION: 1151 cfg80211_mgd_wext_connect(rdev, wdev); 1152 break; 1153 #endif 1154 #ifdef CONFIG_MAC80211_MESH 1155 case NL80211_IFTYPE_MESH_POINT: 1156 { 1157 /* backward compat code... */ 1158 struct mesh_setup setup; 1159 memcpy(&setup, &default_mesh_setup, 1160 sizeof(setup)); 1161 /* back compat only needed for mesh_id */ 1162 setup.mesh_id = wdev->ssid; 1163 setup.mesh_id_len = wdev->mesh_id_up_len; 1164 if (wdev->mesh_id_up_len) 1165 __cfg80211_join_mesh(rdev, dev, 1166 &setup, 1167 &default_mesh_config); 1168 break; 1169 } 1170 #endif 1171 default: 1172 break; 1173 } 1174 wdev_unlock(wdev); 1175 rdev->opencount++; 1176 1177 /* 1178 * Configure power management to the driver here so that its 1179 * correctly set also after interface type changes etc. 1180 */ 1181 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1182 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1183 rdev->ops->set_power_mgmt) 1184 if (rdev_set_power_mgmt(rdev, dev, wdev->ps, 1185 wdev->ps_timeout)) { 1186 /* assume this means it's off */ 1187 wdev->ps = false; 1188 } 1189 break; 1190 case NETDEV_UNREGISTER: 1191 /* 1192 * It is possible to get NETDEV_UNREGISTER 1193 * multiple times. To detect that, check 1194 * that the interface is still on the list 1195 * of registered interfaces, and only then 1196 * remove and clean it up. 1197 */ 1198 if (!list_empty(&wdev->list)) { 1199 nl80211_notify_iface(rdev, wdev, 1200 NL80211_CMD_DEL_INTERFACE); 1201 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 1202 list_del_rcu(&wdev->list); 1203 rdev->devlist_generation++; 1204 cfg80211_mlme_purge_registrations(wdev); 1205 #ifdef CONFIG_CFG80211_WEXT 1206 kzfree(wdev->wext.keys); 1207 #endif 1208 } 1209 /* 1210 * synchronise (so that we won't find this netdev 1211 * from other code any more) and then clear the list 1212 * head so that the above code can safely check for 1213 * !list_empty() to avoid double-cleanup. 1214 */ 1215 synchronize_rcu(); 1216 INIT_LIST_HEAD(&wdev->list); 1217 /* 1218 * Ensure that all events have been processed and 1219 * freed. 1220 */ 1221 cfg80211_process_wdev_events(wdev); 1222 1223 if (WARN_ON(wdev->current_bss)) { 1224 cfg80211_unhold_bss(wdev->current_bss); 1225 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 1226 wdev->current_bss = NULL; 1227 } 1228 break; 1229 case NETDEV_PRE_UP: 1230 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 1231 return notifier_from_errno(-EOPNOTSUPP); 1232 if (rfkill_blocked(rdev->rfkill)) 1233 return notifier_from_errno(-ERFKILL); 1234 break; 1235 default: 1236 return NOTIFY_DONE; 1237 } 1238 1239 wireless_nlevent_flush(); 1240 1241 return NOTIFY_OK; 1242 } 1243 1244 static struct notifier_block cfg80211_netdev_notifier = { 1245 .notifier_call = cfg80211_netdev_notifier_call, 1246 }; 1247 1248 static void __net_exit cfg80211_pernet_exit(struct net *net) 1249 { 1250 struct cfg80211_registered_device *rdev; 1251 1252 rtnl_lock(); 1253 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1254 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1255 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1256 } 1257 rtnl_unlock(); 1258 } 1259 1260 static struct pernet_operations cfg80211_pernet_ops = { 1261 .exit = cfg80211_pernet_exit, 1262 }; 1263 1264 static int __init cfg80211_init(void) 1265 { 1266 int err; 1267 1268 err = register_pernet_device(&cfg80211_pernet_ops); 1269 if (err) 1270 goto out_fail_pernet; 1271 1272 err = wiphy_sysfs_init(); 1273 if (err) 1274 goto out_fail_sysfs; 1275 1276 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1277 if (err) 1278 goto out_fail_notifier; 1279 1280 err = nl80211_init(); 1281 if (err) 1282 goto out_fail_nl80211; 1283 1284 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1285 1286 err = regulatory_init(); 1287 if (err) 1288 goto out_fail_reg; 1289 1290 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM); 1291 if (!cfg80211_wq) { 1292 err = -ENOMEM; 1293 goto out_fail_wq; 1294 } 1295 1296 return 0; 1297 1298 out_fail_wq: 1299 regulatory_exit(); 1300 out_fail_reg: 1301 debugfs_remove(ieee80211_debugfs_dir); 1302 nl80211_exit(); 1303 out_fail_nl80211: 1304 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1305 out_fail_notifier: 1306 wiphy_sysfs_exit(); 1307 out_fail_sysfs: 1308 unregister_pernet_device(&cfg80211_pernet_ops); 1309 out_fail_pernet: 1310 return err; 1311 } 1312 subsys_initcall(cfg80211_init); 1313 1314 static void __exit cfg80211_exit(void) 1315 { 1316 debugfs_remove(ieee80211_debugfs_dir); 1317 nl80211_exit(); 1318 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1319 wiphy_sysfs_exit(); 1320 regulatory_exit(); 1321 unregister_pernet_device(&cfg80211_pernet_ops); 1322 destroy_workqueue(cfg80211_wq); 1323 } 1324 module_exit(cfg80211_exit); 1325