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_running(wdev)) 214 return; 215 216 rdev_stop_p2p_device(rdev, wdev); 217 wdev->is_running = 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_running(wdev)) 237 return; 238 239 rdev_stop_nan(rdev, wdev); 240 wdev->is_running = 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 wireless_dev *wdev, *tmp; 309 310 ASSERT_RTNL(); 311 312 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) { 313 if (wdev->nl_owner_dead) 314 rdev_del_virtual_intf(rdev, wdev); 315 } 316 } 317 318 static void cfg80211_destroy_iface_wk(struct work_struct *work) 319 { 320 struct cfg80211_registered_device *rdev; 321 322 rdev = container_of(work, struct cfg80211_registered_device, 323 destroy_work); 324 325 rtnl_lock(); 326 cfg80211_destroy_ifaces(rdev); 327 rtnl_unlock(); 328 } 329 330 static void cfg80211_sched_scan_stop_wk(struct work_struct *work) 331 { 332 struct cfg80211_registered_device *rdev; 333 struct cfg80211_sched_scan_request *req, *tmp; 334 335 rdev = container_of(work, struct cfg80211_registered_device, 336 sched_scan_stop_wk); 337 338 rtnl_lock(); 339 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { 340 if (req->nl_owner_dead) 341 cfg80211_stop_sched_scan_req(rdev, req, false); 342 } 343 rtnl_unlock(); 344 } 345 346 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work) 347 { 348 struct cfg80211_registered_device *rdev; 349 350 rdev = container_of(work, struct cfg80211_registered_device, 351 propagate_radar_detect_wk); 352 353 rtnl_lock(); 354 355 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef, 356 NL80211_DFS_UNAVAILABLE, 357 NL80211_RADAR_DETECTED); 358 359 rtnl_unlock(); 360 } 361 362 static void cfg80211_propagate_cac_done_wk(struct work_struct *work) 363 { 364 struct cfg80211_registered_device *rdev; 365 366 rdev = container_of(work, struct cfg80211_registered_device, 367 propagate_cac_done_wk); 368 369 rtnl_lock(); 370 371 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef, 372 NL80211_DFS_AVAILABLE, 373 NL80211_RADAR_CAC_FINISHED); 374 375 rtnl_unlock(); 376 } 377 378 /* exported functions */ 379 380 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, 381 const char *requested_name) 382 { 383 static atomic_t wiphy_counter = ATOMIC_INIT(0); 384 385 struct cfg80211_registered_device *rdev; 386 int alloc_size; 387 388 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 389 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 390 WARN_ON(ops->connect && !ops->disconnect); 391 WARN_ON(ops->join_ibss && !ops->leave_ibss); 392 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 393 WARN_ON(ops->add_station && !ops->del_station); 394 WARN_ON(ops->add_mpath && !ops->del_mpath); 395 WARN_ON(ops->join_mesh && !ops->leave_mesh); 396 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device); 397 WARN_ON(ops->start_ap && !ops->stop_ap); 398 WARN_ON(ops->join_ocb && !ops->leave_ocb); 399 WARN_ON(ops->suspend && !ops->resume); 400 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop); 401 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel); 402 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch); 403 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts); 404 405 alloc_size = sizeof(*rdev) + sizeof_priv; 406 407 rdev = kzalloc(alloc_size, GFP_KERNEL); 408 if (!rdev) 409 return NULL; 410 411 rdev->ops = ops; 412 413 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 414 415 if (unlikely(rdev->wiphy_idx < 0)) { 416 /* ugh, wrapped! */ 417 atomic_dec(&wiphy_counter); 418 kfree(rdev); 419 return NULL; 420 } 421 422 /* atomic_inc_return makes it start at 1, make it start at 0 */ 423 rdev->wiphy_idx--; 424 425 /* give it a proper name */ 426 if (requested_name && requested_name[0]) { 427 int rv; 428 429 rtnl_lock(); 430 rv = cfg80211_dev_check_name(rdev, requested_name); 431 432 if (rv < 0) { 433 rtnl_unlock(); 434 goto use_default_name; 435 } 436 437 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); 438 rtnl_unlock(); 439 if (rv) 440 goto use_default_name; 441 } else { 442 use_default_name: 443 /* NOTE: This is *probably* safe w/out holding rtnl because of 444 * the restrictions on phy names. Probably this call could 445 * fail if some other part of the kernel (re)named a device 446 * phyX. But, might should add some locking and check return 447 * value, and use a different name if this one exists? 448 */ 449 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 450 } 451 452 INIT_LIST_HEAD(&rdev->wiphy.wdev_list); 453 INIT_LIST_HEAD(&rdev->beacon_registrations); 454 spin_lock_init(&rdev->beacon_registrations_lock); 455 spin_lock_init(&rdev->bss_lock); 456 INIT_LIST_HEAD(&rdev->bss_list); 457 INIT_LIST_HEAD(&rdev->sched_scan_req_list); 458 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 459 INIT_LIST_HEAD(&rdev->mlme_unreg); 460 spin_lock_init(&rdev->mlme_unreg_lock); 461 INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk); 462 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 463 cfg80211_dfs_channels_update_work); 464 #ifdef CONFIG_CFG80211_WEXT 465 rdev->wiphy.wext = &cfg80211_wext_handler; 466 #endif 467 468 device_initialize(&rdev->wiphy.dev); 469 rdev->wiphy.dev.class = &ieee80211_class; 470 rdev->wiphy.dev.platform_data = rdev; 471 device_enable_async_suspend(&rdev->wiphy.dev); 472 473 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 474 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 475 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk); 476 INIT_WORK(&rdev->propagate_radar_detect_wk, 477 cfg80211_propagate_radar_detect_wk); 478 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk); 479 480 #ifdef CONFIG_CFG80211_DEFAULT_PS 481 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 482 #endif 483 484 wiphy_net_set(&rdev->wiphy, &init_net); 485 486 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 487 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 488 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 489 &rdev->rfkill_ops, rdev); 490 491 if (!rdev->rfkill) { 492 kfree(rdev); 493 return NULL; 494 } 495 496 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); 497 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 498 INIT_WORK(&rdev->event_work, cfg80211_event_work); 499 500 init_waitqueue_head(&rdev->dev_wait); 501 502 /* 503 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 504 * Fragmentation and RTS threshold are disabled by default with the 505 * special -1 value. 506 */ 507 rdev->wiphy.retry_short = 7; 508 rdev->wiphy.retry_long = 4; 509 rdev->wiphy.frag_threshold = (u32) -1; 510 rdev->wiphy.rts_threshold = (u32) -1; 511 rdev->wiphy.coverage_class = 0; 512 513 rdev->wiphy.max_num_csa_counters = 1; 514 515 rdev->wiphy.max_sched_scan_plans = 1; 516 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 517 518 return &rdev->wiphy; 519 } 520 EXPORT_SYMBOL(wiphy_new_nm); 521 522 static int wiphy_verify_combinations(struct wiphy *wiphy) 523 { 524 const struct ieee80211_iface_combination *c; 525 int i, j; 526 527 for (i = 0; i < wiphy->n_iface_combinations; i++) { 528 u32 cnt = 0; 529 u16 all_iftypes = 0; 530 531 c = &wiphy->iface_combinations[i]; 532 533 /* 534 * Combinations with just one interface aren't real, 535 * however we make an exception for DFS. 536 */ 537 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 538 return -EINVAL; 539 540 /* Need at least one channel */ 541 if (WARN_ON(!c->num_different_channels)) 542 return -EINVAL; 543 544 /* 545 * Put a sane limit on maximum number of different 546 * channels to simplify channel accounting code. 547 */ 548 if (WARN_ON(c->num_different_channels > 549 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 550 return -EINVAL; 551 552 /* DFS only works on one channel. */ 553 if (WARN_ON(c->radar_detect_widths && 554 (c->num_different_channels > 1))) 555 return -EINVAL; 556 557 if (WARN_ON(!c->n_limits)) 558 return -EINVAL; 559 560 for (j = 0; j < c->n_limits; j++) { 561 u16 types = c->limits[j].types; 562 563 /* interface types shouldn't overlap */ 564 if (WARN_ON(types & all_iftypes)) 565 return -EINVAL; 566 all_iftypes |= types; 567 568 if (WARN_ON(!c->limits[j].max)) 569 return -EINVAL; 570 571 /* Shouldn't list software iftypes in combinations! */ 572 if (WARN_ON(wiphy->software_iftypes & types)) 573 return -EINVAL; 574 575 /* Only a single P2P_DEVICE can be allowed */ 576 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 577 c->limits[j].max > 1)) 578 return -EINVAL; 579 580 /* Only a single NAN can be allowed */ 581 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) && 582 c->limits[j].max > 1)) 583 return -EINVAL; 584 585 /* 586 * This isn't well-defined right now. If you have an 587 * IBSS interface, then its beacon interval may change 588 * by joining other networks, and nothing prevents it 589 * from doing that. 590 * So technically we probably shouldn't even allow AP 591 * and IBSS in the same interface, but it seems that 592 * some drivers support that, possibly only with fixed 593 * beacon intervals for IBSS. 594 */ 595 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) && 596 c->beacon_int_min_gcd)) { 597 return -EINVAL; 598 } 599 600 cnt += c->limits[j].max; 601 /* 602 * Don't advertise an unsupported type 603 * in a combination. 604 */ 605 if (WARN_ON((wiphy->interface_modes & types) != types)) 606 return -EINVAL; 607 } 608 609 #ifndef CONFIG_WIRELESS_WDS 610 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS))) 611 return -EINVAL; 612 #endif 613 614 /* You can't even choose that many! */ 615 if (WARN_ON(cnt < c->max_interfaces)) 616 return -EINVAL; 617 } 618 619 return 0; 620 } 621 622 int wiphy_register(struct wiphy *wiphy) 623 { 624 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 625 int res; 626 enum nl80211_band band; 627 struct ieee80211_supported_band *sband; 628 bool have_band = false; 629 int i; 630 u16 ifmodes = wiphy->interface_modes; 631 632 #ifdef CONFIG_PM 633 if (WARN_ON(wiphy->wowlan && 634 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 635 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 636 return -EINVAL; 637 if (WARN_ON(wiphy->wowlan && 638 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 639 !wiphy->wowlan->tcp)) 640 return -EINVAL; 641 #endif 642 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 643 (!rdev->ops->tdls_channel_switch || 644 !rdev->ops->tdls_cancel_channel_switch))) 645 return -EINVAL; 646 647 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) && 648 (!rdev->ops->start_nan || !rdev->ops->stop_nan || 649 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func || 650 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ))))) 651 return -EINVAL; 652 653 #ifndef CONFIG_WIRELESS_WDS 654 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))) 655 return -EINVAL; 656 #endif 657 658 /* 659 * if a wiphy has unsupported modes for regulatory channel enforcement, 660 * opt-out of enforcement checking 661 */ 662 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) | 663 BIT(NL80211_IFTYPE_P2P_CLIENT) | 664 BIT(NL80211_IFTYPE_AP) | 665 BIT(NL80211_IFTYPE_P2P_GO) | 666 BIT(NL80211_IFTYPE_ADHOC) | 667 BIT(NL80211_IFTYPE_P2P_DEVICE) | 668 BIT(NL80211_IFTYPE_NAN) | 669 BIT(NL80211_IFTYPE_AP_VLAN) | 670 BIT(NL80211_IFTYPE_MONITOR))) 671 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF; 672 673 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 674 (wiphy->regulatory_flags & 675 (REGULATORY_CUSTOM_REG | 676 REGULATORY_STRICT_REG | 677 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 678 REGULATORY_COUNTRY_IE_IGNORE)))) 679 return -EINVAL; 680 681 if (WARN_ON(wiphy->coalesce && 682 (!wiphy->coalesce->n_rules || 683 !wiphy->coalesce->n_patterns) && 684 (!wiphy->coalesce->pattern_min_len || 685 wiphy->coalesce->pattern_min_len > 686 wiphy->coalesce->pattern_max_len))) 687 return -EINVAL; 688 689 if (WARN_ON(wiphy->ap_sme_capa && 690 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 691 return -EINVAL; 692 693 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 694 return -EINVAL; 695 696 if (WARN_ON(wiphy->addresses && 697 !is_zero_ether_addr(wiphy->perm_addr) && 698 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 699 ETH_ALEN))) 700 return -EINVAL; 701 702 if (WARN_ON(wiphy->max_acl_mac_addrs && 703 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 704 !rdev->ops->set_mac_acl))) 705 return -EINVAL; 706 707 /* assure only valid behaviours are flagged by driver 708 * hence subtract 2 as bit 0 is invalid. 709 */ 710 if (WARN_ON(wiphy->bss_select_support && 711 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 712 return -EINVAL; 713 714 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy, 715 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) && 716 (!rdev->ops->set_pmk || !rdev->ops->del_pmk))) 717 return -EINVAL; 718 719 if (wiphy->addresses) 720 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 721 722 /* sanity check ifmodes */ 723 WARN_ON(!ifmodes); 724 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 725 if (WARN_ON(ifmodes != wiphy->interface_modes)) 726 wiphy->interface_modes = ifmodes; 727 728 res = wiphy_verify_combinations(wiphy); 729 if (res) 730 return res; 731 732 /* sanity check supported bands/channels */ 733 for (band = 0; band < NUM_NL80211_BANDS; band++) { 734 sband = wiphy->bands[band]; 735 if (!sband) 736 continue; 737 738 sband->band = band; 739 if (WARN_ON(!sband->n_channels)) 740 return -EINVAL; 741 /* 742 * on 60GHz band, there are no legacy rates, so 743 * n_bitrates is 0 744 */ 745 if (WARN_ON(band != NL80211_BAND_60GHZ && 746 !sband->n_bitrates)) 747 return -EINVAL; 748 749 /* 750 * Since cfg80211_disable_40mhz_24ghz is global, we can 751 * modify the sband's ht data even if the driver uses a 752 * global structure for that. 753 */ 754 if (cfg80211_disable_40mhz_24ghz && 755 band == NL80211_BAND_2GHZ && 756 sband->ht_cap.ht_supported) { 757 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 758 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 759 } 760 761 /* 762 * Since we use a u32 for rate bitmaps in 763 * ieee80211_get_response_rate, we cannot 764 * have more than 32 legacy rates. 765 */ 766 if (WARN_ON(sband->n_bitrates > 32)) 767 return -EINVAL; 768 769 for (i = 0; i < sband->n_channels; i++) { 770 sband->channels[i].orig_flags = 771 sband->channels[i].flags; 772 sband->channels[i].orig_mag = INT_MAX; 773 sband->channels[i].orig_mpwr = 774 sband->channels[i].max_power; 775 sband->channels[i].band = band; 776 } 777 778 have_band = true; 779 } 780 781 if (!have_band) { 782 WARN_ON(1); 783 return -EINVAL; 784 } 785 786 #ifdef CONFIG_PM 787 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 788 (!rdev->wiphy.wowlan->pattern_min_len || 789 rdev->wiphy.wowlan->pattern_min_len > 790 rdev->wiphy.wowlan->pattern_max_len))) 791 return -EINVAL; 792 #endif 793 794 /* check and set up bitrates */ 795 ieee80211_set_bitrate_flags(wiphy); 796 797 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 798 799 rtnl_lock(); 800 res = device_add(&rdev->wiphy.dev); 801 if (res) { 802 rtnl_unlock(); 803 return res; 804 } 805 806 /* set up regulatory info */ 807 wiphy_regulatory_register(wiphy); 808 809 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 810 cfg80211_rdev_list_generation++; 811 812 /* add to debugfs */ 813 rdev->wiphy.debugfsdir = 814 debugfs_create_dir(wiphy_name(&rdev->wiphy), 815 ieee80211_debugfs_dir); 816 if (IS_ERR(rdev->wiphy.debugfsdir)) 817 rdev->wiphy.debugfsdir = NULL; 818 819 cfg80211_debugfs_rdev_add(rdev); 820 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 821 822 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 823 struct regulatory_request request; 824 825 request.wiphy_idx = get_wiphy_idx(wiphy); 826 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 827 request.alpha2[0] = '9'; 828 request.alpha2[1] = '9'; 829 830 nl80211_send_reg_change_event(&request); 831 } 832 833 /* Check that nobody globally advertises any capabilities they do not 834 * advertise on all possible interface types. 835 */ 836 if (wiphy->extended_capabilities_len && 837 wiphy->num_iftype_ext_capab && 838 wiphy->iftype_ext_capab) { 839 u8 supported_on_all, j; 840 const struct wiphy_iftype_ext_capab *capab; 841 842 capab = wiphy->iftype_ext_capab; 843 for (j = 0; j < wiphy->extended_capabilities_len; j++) { 844 if (capab[0].extended_capabilities_len > j) 845 supported_on_all = 846 capab[0].extended_capabilities[j]; 847 else 848 supported_on_all = 0x00; 849 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) { 850 if (j >= capab[i].extended_capabilities_len) { 851 supported_on_all = 0x00; 852 break; 853 } 854 supported_on_all &= 855 capab[i].extended_capabilities[j]; 856 } 857 if (WARN_ON(wiphy->extended_capabilities[j] & 858 ~supported_on_all)) 859 break; 860 } 861 } 862 863 rdev->wiphy.registered = true; 864 rtnl_unlock(); 865 866 res = rfkill_register(rdev->rfkill); 867 if (res) { 868 rfkill_destroy(rdev->rfkill); 869 rdev->rfkill = NULL; 870 wiphy_unregister(&rdev->wiphy); 871 return res; 872 } 873 874 return 0; 875 } 876 EXPORT_SYMBOL(wiphy_register); 877 878 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 879 { 880 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 881 882 if (!rdev->ops->rfkill_poll) 883 return; 884 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 885 rfkill_resume_polling(rdev->rfkill); 886 } 887 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 888 889 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 890 { 891 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 892 893 rfkill_pause_polling(rdev->rfkill); 894 } 895 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 896 897 void wiphy_unregister(struct wiphy *wiphy) 898 { 899 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 900 901 wait_event(rdev->dev_wait, ({ 902 int __count; 903 rtnl_lock(); 904 __count = rdev->opencount; 905 rtnl_unlock(); 906 __count == 0; })); 907 908 if (rdev->rfkill) 909 rfkill_unregister(rdev->rfkill); 910 911 rtnl_lock(); 912 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 913 rdev->wiphy.registered = false; 914 915 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 916 917 /* 918 * First remove the hardware from everywhere, this makes 919 * it impossible to find from userspace. 920 */ 921 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 922 list_del_rcu(&rdev->list); 923 synchronize_rcu(); 924 925 /* 926 * If this device got a regulatory hint tell core its 927 * free to listen now to a new shiny device regulatory hint 928 */ 929 wiphy_regulatory_deregister(wiphy); 930 931 cfg80211_rdev_list_generation++; 932 device_del(&rdev->wiphy.dev); 933 934 rtnl_unlock(); 935 936 flush_work(&rdev->scan_done_wk); 937 cancel_work_sync(&rdev->conn_work); 938 flush_work(&rdev->event_work); 939 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 940 flush_work(&rdev->destroy_work); 941 flush_work(&rdev->sched_scan_stop_wk); 942 flush_work(&rdev->mlme_unreg_wk); 943 flush_work(&rdev->propagate_radar_detect_wk); 944 flush_work(&rdev->propagate_cac_done_wk); 945 946 #ifdef CONFIG_PM 947 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 948 rdev_set_wakeup(rdev, false); 949 #endif 950 cfg80211_rdev_free_wowlan(rdev); 951 cfg80211_rdev_free_coalesce(rdev); 952 } 953 EXPORT_SYMBOL(wiphy_unregister); 954 955 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 956 { 957 struct cfg80211_internal_bss *scan, *tmp; 958 struct cfg80211_beacon_registration *reg, *treg; 959 rfkill_destroy(rdev->rfkill); 960 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 961 list_del(®->list); 962 kfree(reg); 963 } 964 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 965 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 966 kfree(rdev); 967 } 968 969 void wiphy_free(struct wiphy *wiphy) 970 { 971 put_device(&wiphy->dev); 972 } 973 EXPORT_SYMBOL(wiphy_free); 974 975 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 976 { 977 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 978 979 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 980 schedule_work(&rdev->rfkill_sync); 981 } 982 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 983 984 void cfg80211_cqm_config_free(struct wireless_dev *wdev) 985 { 986 kfree(wdev->cqm_config); 987 wdev->cqm_config = NULL; 988 } 989 990 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 991 { 992 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 993 994 ASSERT_RTNL(); 995 996 if (WARN_ON(wdev->netdev)) 997 return; 998 999 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 1000 1001 list_del_rcu(&wdev->list); 1002 rdev->devlist_generation++; 1003 1004 switch (wdev->iftype) { 1005 case NL80211_IFTYPE_P2P_DEVICE: 1006 cfg80211_mlme_purge_registrations(wdev); 1007 cfg80211_stop_p2p_device(rdev, wdev); 1008 break; 1009 case NL80211_IFTYPE_NAN: 1010 cfg80211_stop_nan(rdev, wdev); 1011 break; 1012 default: 1013 WARN_ON_ONCE(1); 1014 break; 1015 } 1016 1017 cfg80211_cqm_config_free(wdev); 1018 } 1019 EXPORT_SYMBOL(cfg80211_unregister_wdev); 1020 1021 static const struct device_type wiphy_type = { 1022 .name = "wlan", 1023 }; 1024 1025 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 1026 enum nl80211_iftype iftype, int num) 1027 { 1028 ASSERT_RTNL(); 1029 1030 rdev->num_running_ifaces += num; 1031 if (iftype == NL80211_IFTYPE_MONITOR) 1032 rdev->num_running_monitor_ifaces += num; 1033 } 1034 1035 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 1036 struct wireless_dev *wdev) 1037 { 1038 struct net_device *dev = wdev->netdev; 1039 struct cfg80211_sched_scan_request *pos, *tmp; 1040 1041 ASSERT_RTNL(); 1042 ASSERT_WDEV_LOCK(wdev); 1043 1044 switch (wdev->iftype) { 1045 case NL80211_IFTYPE_ADHOC: 1046 __cfg80211_leave_ibss(rdev, dev, true); 1047 break; 1048 case NL80211_IFTYPE_P2P_CLIENT: 1049 case NL80211_IFTYPE_STATION: 1050 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, 1051 list) { 1052 if (dev == pos->dev) 1053 cfg80211_stop_sched_scan_req(rdev, pos, false); 1054 } 1055 1056 #ifdef CONFIG_CFG80211_WEXT 1057 kfree(wdev->wext.ie); 1058 wdev->wext.ie = NULL; 1059 wdev->wext.ie_len = 0; 1060 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1061 #endif 1062 cfg80211_disconnect(rdev, dev, 1063 WLAN_REASON_DEAUTH_LEAVING, true); 1064 break; 1065 case NL80211_IFTYPE_MESH_POINT: 1066 __cfg80211_leave_mesh(rdev, dev); 1067 break; 1068 case NL80211_IFTYPE_AP: 1069 case NL80211_IFTYPE_P2P_GO: 1070 __cfg80211_stop_ap(rdev, dev, true); 1071 break; 1072 case NL80211_IFTYPE_OCB: 1073 __cfg80211_leave_ocb(rdev, dev); 1074 break; 1075 case NL80211_IFTYPE_WDS: 1076 /* must be handled by mac80211/driver, has no APIs */ 1077 break; 1078 case NL80211_IFTYPE_P2P_DEVICE: 1079 case NL80211_IFTYPE_NAN: 1080 /* cannot happen, has no netdev */ 1081 break; 1082 case NL80211_IFTYPE_AP_VLAN: 1083 case NL80211_IFTYPE_MONITOR: 1084 /* nothing to do */ 1085 break; 1086 case NL80211_IFTYPE_UNSPECIFIED: 1087 case NUM_NL80211_IFTYPES: 1088 /* invalid */ 1089 break; 1090 } 1091 } 1092 1093 void cfg80211_leave(struct cfg80211_registered_device *rdev, 1094 struct wireless_dev *wdev) 1095 { 1096 wdev_lock(wdev); 1097 __cfg80211_leave(rdev, wdev); 1098 wdev_unlock(wdev); 1099 } 1100 1101 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 1102 gfp_t gfp) 1103 { 1104 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1105 struct cfg80211_event *ev; 1106 unsigned long flags; 1107 1108 trace_cfg80211_stop_iface(wiphy, wdev); 1109 1110 ev = kzalloc(sizeof(*ev), gfp); 1111 if (!ev) 1112 return; 1113 1114 ev->type = EVENT_STOPPED; 1115 1116 spin_lock_irqsave(&wdev->event_lock, flags); 1117 list_add_tail(&ev->list, &wdev->event_list); 1118 spin_unlock_irqrestore(&wdev->event_lock, flags); 1119 queue_work(cfg80211_wq, &rdev->event_work); 1120 } 1121 EXPORT_SYMBOL(cfg80211_stop_iface); 1122 1123 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 1124 unsigned long state, void *ptr) 1125 { 1126 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1127 struct wireless_dev *wdev = dev->ieee80211_ptr; 1128 struct cfg80211_registered_device *rdev; 1129 struct cfg80211_sched_scan_request *pos, *tmp; 1130 1131 if (!wdev) 1132 return NOTIFY_DONE; 1133 1134 rdev = wiphy_to_rdev(wdev->wiphy); 1135 1136 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 1137 1138 switch (state) { 1139 case NETDEV_POST_INIT: 1140 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 1141 break; 1142 case NETDEV_REGISTER: 1143 /* 1144 * NB: cannot take rdev->mtx here because this may be 1145 * called within code protected by it when interfaces 1146 * are added with nl80211. 1147 */ 1148 mutex_init(&wdev->mtx); 1149 INIT_LIST_HEAD(&wdev->event_list); 1150 spin_lock_init(&wdev->event_lock); 1151 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1152 spin_lock_init(&wdev->mgmt_registrations_lock); 1153 1154 /* 1155 * We get here also when the interface changes network namespaces, 1156 * as it's registered into the new one, but we don't want it to 1157 * change ID in that case. Checking if the ID is already assigned 1158 * works, because 0 isn't considered a valid ID and the memory is 1159 * 0-initialized. 1160 */ 1161 if (!wdev->identifier) 1162 wdev->identifier = ++rdev->wdev_id; 1163 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list); 1164 rdev->devlist_generation++; 1165 /* can only change netns with wiphy */ 1166 dev->features |= NETIF_F_NETNS_LOCAL; 1167 1168 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 1169 "phy80211")) { 1170 pr_err("failed to add phy80211 symlink to netdev!\n"); 1171 } 1172 wdev->netdev = dev; 1173 #ifdef CONFIG_CFG80211_WEXT 1174 wdev->wext.default_key = -1; 1175 wdev->wext.default_mgmt_key = -1; 1176 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1177 #endif 1178 1179 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1180 wdev->ps = true; 1181 else 1182 wdev->ps = false; 1183 /* allow mac80211 to determine the timeout */ 1184 wdev->ps_timeout = -1; 1185 1186 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1187 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1188 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1189 dev->priv_flags |= IFF_DONT_BRIDGE; 1190 1191 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk); 1192 1193 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 1194 break; 1195 case NETDEV_GOING_DOWN: 1196 cfg80211_leave(rdev, wdev); 1197 break; 1198 case NETDEV_DOWN: 1199 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1200 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1201 if (WARN_ON(!rdev->scan_req->notified)) 1202 rdev->scan_req->info.aborted = true; 1203 ___cfg80211_scan_done(rdev, false); 1204 } 1205 1206 list_for_each_entry_safe(pos, tmp, 1207 &rdev->sched_scan_req_list, list) { 1208 if (WARN_ON(pos && pos->dev == wdev->netdev)) 1209 cfg80211_stop_sched_scan_req(rdev, pos, false); 1210 } 1211 1212 rdev->opencount--; 1213 wake_up(&rdev->dev_wait); 1214 break; 1215 case NETDEV_UP: 1216 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1217 wdev_lock(wdev); 1218 switch (wdev->iftype) { 1219 #ifdef CONFIG_CFG80211_WEXT 1220 case NL80211_IFTYPE_ADHOC: 1221 cfg80211_ibss_wext_join(rdev, wdev); 1222 break; 1223 case NL80211_IFTYPE_STATION: 1224 cfg80211_mgd_wext_connect(rdev, wdev); 1225 break; 1226 #endif 1227 #ifdef CONFIG_MAC80211_MESH 1228 case NL80211_IFTYPE_MESH_POINT: 1229 { 1230 /* backward compat code... */ 1231 struct mesh_setup setup; 1232 memcpy(&setup, &default_mesh_setup, 1233 sizeof(setup)); 1234 /* back compat only needed for mesh_id */ 1235 setup.mesh_id = wdev->ssid; 1236 setup.mesh_id_len = wdev->mesh_id_up_len; 1237 if (wdev->mesh_id_up_len) 1238 __cfg80211_join_mesh(rdev, dev, 1239 &setup, 1240 &default_mesh_config); 1241 break; 1242 } 1243 #endif 1244 default: 1245 break; 1246 } 1247 wdev_unlock(wdev); 1248 rdev->opencount++; 1249 1250 /* 1251 * Configure power management to the driver here so that its 1252 * correctly set also after interface type changes etc. 1253 */ 1254 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1255 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1256 rdev->ops->set_power_mgmt && 1257 rdev_set_power_mgmt(rdev, dev, wdev->ps, 1258 wdev->ps_timeout)) { 1259 /* assume this means it's off */ 1260 wdev->ps = false; 1261 } 1262 break; 1263 case NETDEV_UNREGISTER: 1264 /* 1265 * It is possible to get NETDEV_UNREGISTER 1266 * multiple times. To detect that, check 1267 * that the interface is still on the list 1268 * of registered interfaces, and only then 1269 * remove and clean it up. 1270 */ 1271 if (!list_empty(&wdev->list)) { 1272 nl80211_notify_iface(rdev, wdev, 1273 NL80211_CMD_DEL_INTERFACE); 1274 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 1275 list_del_rcu(&wdev->list); 1276 rdev->devlist_generation++; 1277 cfg80211_mlme_purge_registrations(wdev); 1278 #ifdef CONFIG_CFG80211_WEXT 1279 kzfree(wdev->wext.keys); 1280 #endif 1281 flush_work(&wdev->disconnect_wk); 1282 cfg80211_cqm_config_free(wdev); 1283 } 1284 /* 1285 * synchronise (so that we won't find this netdev 1286 * from other code any more) and then clear the list 1287 * head so that the above code can safely check for 1288 * !list_empty() to avoid double-cleanup. 1289 */ 1290 synchronize_rcu(); 1291 INIT_LIST_HEAD(&wdev->list); 1292 /* 1293 * Ensure that all events have been processed and 1294 * freed. 1295 */ 1296 cfg80211_process_wdev_events(wdev); 1297 1298 if (WARN_ON(wdev->current_bss)) { 1299 cfg80211_unhold_bss(wdev->current_bss); 1300 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 1301 wdev->current_bss = NULL; 1302 } 1303 break; 1304 case NETDEV_PRE_UP: 1305 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 1306 return notifier_from_errno(-EOPNOTSUPP); 1307 if (rfkill_blocked(rdev->rfkill)) 1308 return notifier_from_errno(-ERFKILL); 1309 break; 1310 default: 1311 return NOTIFY_DONE; 1312 } 1313 1314 wireless_nlevent_flush(); 1315 1316 return NOTIFY_OK; 1317 } 1318 1319 static struct notifier_block cfg80211_netdev_notifier = { 1320 .notifier_call = cfg80211_netdev_notifier_call, 1321 }; 1322 1323 static void __net_exit cfg80211_pernet_exit(struct net *net) 1324 { 1325 struct cfg80211_registered_device *rdev; 1326 1327 rtnl_lock(); 1328 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1329 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1330 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1331 } 1332 rtnl_unlock(); 1333 } 1334 1335 static struct pernet_operations cfg80211_pernet_ops = { 1336 .exit = cfg80211_pernet_exit, 1337 }; 1338 1339 static int __init cfg80211_init(void) 1340 { 1341 int err; 1342 1343 err = register_pernet_device(&cfg80211_pernet_ops); 1344 if (err) 1345 goto out_fail_pernet; 1346 1347 err = wiphy_sysfs_init(); 1348 if (err) 1349 goto out_fail_sysfs; 1350 1351 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1352 if (err) 1353 goto out_fail_notifier; 1354 1355 err = nl80211_init(); 1356 if (err) 1357 goto out_fail_nl80211; 1358 1359 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1360 1361 err = regulatory_init(); 1362 if (err) 1363 goto out_fail_reg; 1364 1365 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM); 1366 if (!cfg80211_wq) { 1367 err = -ENOMEM; 1368 goto out_fail_wq; 1369 } 1370 1371 return 0; 1372 1373 out_fail_wq: 1374 regulatory_exit(); 1375 out_fail_reg: 1376 debugfs_remove(ieee80211_debugfs_dir); 1377 nl80211_exit(); 1378 out_fail_nl80211: 1379 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1380 out_fail_notifier: 1381 wiphy_sysfs_exit(); 1382 out_fail_sysfs: 1383 unregister_pernet_device(&cfg80211_pernet_ops); 1384 out_fail_pernet: 1385 return err; 1386 } 1387 subsys_initcall(cfg80211_init); 1388 1389 static void __exit cfg80211_exit(void) 1390 { 1391 debugfs_remove(ieee80211_debugfs_dir); 1392 nl80211_exit(); 1393 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1394 wiphy_sysfs_exit(); 1395 regulatory_exit(); 1396 unregister_pernet_device(&cfg80211_pernet_ops); 1397 destroy_workqueue(cfg80211_wq); 1398 } 1399 module_exit(cfg80211_exit); 1400