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 if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN) 99 return -EINVAL; 100 101 /* prohibit calling the thing phy%d when %d is not its number */ 102 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken); 103 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) { 104 /* count number of places needed to print wiphy_idx */ 105 digits = 1; 106 while (wiphy_idx /= 10) 107 digits++; 108 /* 109 * deny the name if it is phy<idx> where <idx> is printed 110 * without leading zeroes. taken == strlen(newname) here 111 */ 112 if (taken == strlen(PHY_NAME) + digits) 113 return -EINVAL; 114 } 115 116 /* Ensure another device does not already have this name. */ 117 list_for_each_entry(rdev2, &cfg80211_rdev_list, list) 118 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0) 119 return -EINVAL; 120 121 return 0; 122 } 123 124 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, 125 char *newname) 126 { 127 int result; 128 129 ASSERT_RTNL(); 130 131 /* Ignore nop renames */ 132 if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0) 133 return 0; 134 135 result = cfg80211_dev_check_name(rdev, newname); 136 if (result < 0) 137 return result; 138 139 result = device_rename(&rdev->wiphy.dev, newname); 140 if (result) 141 return result; 142 143 if (rdev->wiphy.debugfsdir && 144 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent, 145 rdev->wiphy.debugfsdir, 146 rdev->wiphy.debugfsdir->d_parent, 147 newname)) 148 pr_err("failed to rename debugfs dir to %s!\n", newname); 149 150 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 151 152 return 0; 153 } 154 155 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, 156 struct net *net) 157 { 158 struct wireless_dev *wdev; 159 int err = 0; 160 161 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK)) 162 return -EOPNOTSUPP; 163 164 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 165 if (!wdev->netdev) 166 continue; 167 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 168 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); 169 if (err) 170 break; 171 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 172 } 173 174 if (err) { 175 /* failed -- clean up to old netns */ 176 net = wiphy_net(&rdev->wiphy); 177 178 list_for_each_entry_continue_reverse(wdev, 179 &rdev->wiphy.wdev_list, 180 list) { 181 if (!wdev->netdev) 182 continue; 183 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 184 err = dev_change_net_namespace(wdev->netdev, net, 185 "wlan%d"); 186 WARN_ON(err); 187 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 188 } 189 190 return err; 191 } 192 193 wiphy_net_set(&rdev->wiphy, net); 194 195 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev)); 196 WARN_ON(err); 197 198 return 0; 199 } 200 201 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data) 202 { 203 struct cfg80211_registered_device *rdev = data; 204 205 rdev_rfkill_poll(rdev); 206 } 207 208 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev, 209 struct wireless_dev *wdev) 210 { 211 ASSERT_RTNL(); 212 213 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE)) 214 return; 215 216 if (!wdev_running(wdev)) 217 return; 218 219 rdev_stop_p2p_device(rdev, wdev); 220 wdev->is_running = false; 221 222 rdev->opencount--; 223 224 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 225 if (WARN_ON(!rdev->scan_req->notified)) 226 rdev->scan_req->info.aborted = true; 227 ___cfg80211_scan_done(rdev, false); 228 } 229 } 230 231 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev, 232 struct wireless_dev *wdev) 233 { 234 ASSERT_RTNL(); 235 236 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN)) 237 return; 238 239 if (!wdev_running(wdev)) 240 return; 241 242 rdev_stop_nan(rdev, wdev); 243 wdev->is_running = false; 244 245 rdev->opencount--; 246 } 247 248 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy) 249 { 250 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 251 struct wireless_dev *wdev; 252 253 ASSERT_RTNL(); 254 255 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 256 if (wdev->netdev) { 257 dev_close(wdev->netdev); 258 continue; 259 } 260 /* otherwise, check iftype */ 261 switch (wdev->iftype) { 262 case NL80211_IFTYPE_P2P_DEVICE: 263 cfg80211_stop_p2p_device(rdev, wdev); 264 break; 265 case NL80211_IFTYPE_NAN: 266 cfg80211_stop_nan(rdev, wdev); 267 break; 268 default: 269 break; 270 } 271 } 272 } 273 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces); 274 275 static int cfg80211_rfkill_set_block(void *data, bool blocked) 276 { 277 struct cfg80211_registered_device *rdev = data; 278 279 if (!blocked) 280 return 0; 281 282 rtnl_lock(); 283 cfg80211_shutdown_all_interfaces(&rdev->wiphy); 284 rtnl_unlock(); 285 286 return 0; 287 } 288 289 static void cfg80211_rfkill_sync_work(struct work_struct *work) 290 { 291 struct cfg80211_registered_device *rdev; 292 293 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync); 294 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill)); 295 } 296 297 static void cfg80211_event_work(struct work_struct *work) 298 { 299 struct cfg80211_registered_device *rdev; 300 301 rdev = container_of(work, struct cfg80211_registered_device, 302 event_work); 303 304 rtnl_lock(); 305 cfg80211_process_rdev_events(rdev); 306 rtnl_unlock(); 307 } 308 309 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev) 310 { 311 struct wireless_dev *wdev, *tmp; 312 313 ASSERT_RTNL(); 314 315 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) { 316 if (wdev->nl_owner_dead) 317 rdev_del_virtual_intf(rdev, wdev); 318 } 319 } 320 321 static void cfg80211_destroy_iface_wk(struct work_struct *work) 322 { 323 struct cfg80211_registered_device *rdev; 324 325 rdev = container_of(work, struct cfg80211_registered_device, 326 destroy_work); 327 328 rtnl_lock(); 329 cfg80211_destroy_ifaces(rdev); 330 rtnl_unlock(); 331 } 332 333 static void cfg80211_sched_scan_stop_wk(struct work_struct *work) 334 { 335 struct cfg80211_registered_device *rdev; 336 struct cfg80211_sched_scan_request *req, *tmp; 337 338 rdev = container_of(work, struct cfg80211_registered_device, 339 sched_scan_stop_wk); 340 341 rtnl_lock(); 342 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { 343 if (req->nl_owner_dead) 344 cfg80211_stop_sched_scan_req(rdev, req, false); 345 } 346 rtnl_unlock(); 347 } 348 349 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work) 350 { 351 struct cfg80211_registered_device *rdev; 352 353 rdev = container_of(work, struct cfg80211_registered_device, 354 propagate_radar_detect_wk); 355 356 rtnl_lock(); 357 358 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef, 359 NL80211_DFS_UNAVAILABLE, 360 NL80211_RADAR_DETECTED); 361 362 rtnl_unlock(); 363 } 364 365 static void cfg80211_propagate_cac_done_wk(struct work_struct *work) 366 { 367 struct cfg80211_registered_device *rdev; 368 369 rdev = container_of(work, struct cfg80211_registered_device, 370 propagate_cac_done_wk); 371 372 rtnl_lock(); 373 374 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef, 375 NL80211_DFS_AVAILABLE, 376 NL80211_RADAR_CAC_FINISHED); 377 378 rtnl_unlock(); 379 } 380 381 /* exported functions */ 382 383 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, 384 const char *requested_name) 385 { 386 static atomic_t wiphy_counter = ATOMIC_INIT(0); 387 388 struct cfg80211_registered_device *rdev; 389 int alloc_size; 390 391 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 392 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 393 WARN_ON(ops->connect && !ops->disconnect); 394 WARN_ON(ops->join_ibss && !ops->leave_ibss); 395 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 396 WARN_ON(ops->add_station && !ops->del_station); 397 WARN_ON(ops->add_mpath && !ops->del_mpath); 398 WARN_ON(ops->join_mesh && !ops->leave_mesh); 399 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device); 400 WARN_ON(ops->start_ap && !ops->stop_ap); 401 WARN_ON(ops->join_ocb && !ops->leave_ocb); 402 WARN_ON(ops->suspend && !ops->resume); 403 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop); 404 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel); 405 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch); 406 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts); 407 408 alloc_size = sizeof(*rdev) + sizeof_priv; 409 410 rdev = kzalloc(alloc_size, GFP_KERNEL); 411 if (!rdev) 412 return NULL; 413 414 rdev->ops = ops; 415 416 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 417 418 if (unlikely(rdev->wiphy_idx < 0)) { 419 /* ugh, wrapped! */ 420 atomic_dec(&wiphy_counter); 421 kfree(rdev); 422 return NULL; 423 } 424 425 /* atomic_inc_return makes it start at 1, make it start at 0 */ 426 rdev->wiphy_idx--; 427 428 /* give it a proper name */ 429 if (requested_name && requested_name[0]) { 430 int rv; 431 432 rtnl_lock(); 433 rv = cfg80211_dev_check_name(rdev, requested_name); 434 435 if (rv < 0) { 436 rtnl_unlock(); 437 goto use_default_name; 438 } 439 440 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); 441 rtnl_unlock(); 442 if (rv) 443 goto use_default_name; 444 } else { 445 int rv; 446 447 use_default_name: 448 /* NOTE: This is *probably* safe w/out holding rtnl because of 449 * the restrictions on phy names. Probably this call could 450 * fail if some other part of the kernel (re)named a device 451 * phyX. But, might should add some locking and check return 452 * value, and use a different name if this one exists? 453 */ 454 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 455 if (rv < 0) { 456 kfree(rdev); 457 return NULL; 458 } 459 } 460 461 INIT_LIST_HEAD(&rdev->wiphy.wdev_list); 462 INIT_LIST_HEAD(&rdev->beacon_registrations); 463 spin_lock_init(&rdev->beacon_registrations_lock); 464 spin_lock_init(&rdev->bss_lock); 465 INIT_LIST_HEAD(&rdev->bss_list); 466 INIT_LIST_HEAD(&rdev->sched_scan_req_list); 467 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 468 INIT_LIST_HEAD(&rdev->mlme_unreg); 469 spin_lock_init(&rdev->mlme_unreg_lock); 470 INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk); 471 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 472 cfg80211_dfs_channels_update_work); 473 #ifdef CONFIG_CFG80211_WEXT 474 rdev->wiphy.wext = &cfg80211_wext_handler; 475 #endif 476 477 device_initialize(&rdev->wiphy.dev); 478 rdev->wiphy.dev.class = &ieee80211_class; 479 rdev->wiphy.dev.platform_data = rdev; 480 device_enable_async_suspend(&rdev->wiphy.dev); 481 482 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 483 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 484 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk); 485 INIT_WORK(&rdev->propagate_radar_detect_wk, 486 cfg80211_propagate_radar_detect_wk); 487 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk); 488 489 #ifdef CONFIG_CFG80211_DEFAULT_PS 490 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 491 #endif 492 493 wiphy_net_set(&rdev->wiphy, &init_net); 494 495 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 496 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 497 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 498 &rdev->rfkill_ops, rdev); 499 500 if (!rdev->rfkill) { 501 kfree(rdev); 502 return NULL; 503 } 504 505 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); 506 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 507 INIT_WORK(&rdev->event_work, cfg80211_event_work); 508 509 init_waitqueue_head(&rdev->dev_wait); 510 511 /* 512 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 513 * Fragmentation and RTS threshold are disabled by default with the 514 * special -1 value. 515 */ 516 rdev->wiphy.retry_short = 7; 517 rdev->wiphy.retry_long = 4; 518 rdev->wiphy.frag_threshold = (u32) -1; 519 rdev->wiphy.rts_threshold = (u32) -1; 520 rdev->wiphy.coverage_class = 0; 521 522 rdev->wiphy.max_num_csa_counters = 1; 523 524 rdev->wiphy.max_sched_scan_plans = 1; 525 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 526 527 return &rdev->wiphy; 528 } 529 EXPORT_SYMBOL(wiphy_new_nm); 530 531 static int wiphy_verify_combinations(struct wiphy *wiphy) 532 { 533 const struct ieee80211_iface_combination *c; 534 int i, j; 535 536 for (i = 0; i < wiphy->n_iface_combinations; i++) { 537 u32 cnt = 0; 538 u16 all_iftypes = 0; 539 540 c = &wiphy->iface_combinations[i]; 541 542 /* 543 * Combinations with just one interface aren't real, 544 * however we make an exception for DFS. 545 */ 546 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 547 return -EINVAL; 548 549 /* Need at least one channel */ 550 if (WARN_ON(!c->num_different_channels)) 551 return -EINVAL; 552 553 /* 554 * Put a sane limit on maximum number of different 555 * channels to simplify channel accounting code. 556 */ 557 if (WARN_ON(c->num_different_channels > 558 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 559 return -EINVAL; 560 561 /* DFS only works on one channel. */ 562 if (WARN_ON(c->radar_detect_widths && 563 (c->num_different_channels > 1))) 564 return -EINVAL; 565 566 if (WARN_ON(!c->n_limits)) 567 return -EINVAL; 568 569 for (j = 0; j < c->n_limits; j++) { 570 u16 types = c->limits[j].types; 571 572 /* interface types shouldn't overlap */ 573 if (WARN_ON(types & all_iftypes)) 574 return -EINVAL; 575 all_iftypes |= types; 576 577 if (WARN_ON(!c->limits[j].max)) 578 return -EINVAL; 579 580 /* Shouldn't list software iftypes in combinations! */ 581 if (WARN_ON(wiphy->software_iftypes & types)) 582 return -EINVAL; 583 584 /* Only a single P2P_DEVICE can be allowed */ 585 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 586 c->limits[j].max > 1)) 587 return -EINVAL; 588 589 /* Only a single NAN can be allowed */ 590 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) && 591 c->limits[j].max > 1)) 592 return -EINVAL; 593 594 /* 595 * This isn't well-defined right now. If you have an 596 * IBSS interface, then its beacon interval may change 597 * by joining other networks, and nothing prevents it 598 * from doing that. 599 * So technically we probably shouldn't even allow AP 600 * and IBSS in the same interface, but it seems that 601 * some drivers support that, possibly only with fixed 602 * beacon intervals for IBSS. 603 */ 604 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) && 605 c->beacon_int_min_gcd)) { 606 return -EINVAL; 607 } 608 609 cnt += c->limits[j].max; 610 /* 611 * Don't advertise an unsupported type 612 * in a combination. 613 */ 614 if (WARN_ON((wiphy->interface_modes & types) != types)) 615 return -EINVAL; 616 } 617 618 #ifndef CONFIG_WIRELESS_WDS 619 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS))) 620 return -EINVAL; 621 #endif 622 623 /* You can't even choose that many! */ 624 if (WARN_ON(cnt < c->max_interfaces)) 625 return -EINVAL; 626 } 627 628 return 0; 629 } 630 631 int wiphy_register(struct wiphy *wiphy) 632 { 633 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 634 int res; 635 enum nl80211_band band; 636 struct ieee80211_supported_band *sband; 637 bool have_band = false; 638 int i; 639 u16 ifmodes = wiphy->interface_modes; 640 641 #ifdef CONFIG_PM 642 if (WARN_ON(wiphy->wowlan && 643 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 644 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 645 return -EINVAL; 646 if (WARN_ON(wiphy->wowlan && 647 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 648 !wiphy->wowlan->tcp)) 649 return -EINVAL; 650 #endif 651 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 652 (!rdev->ops->tdls_channel_switch || 653 !rdev->ops->tdls_cancel_channel_switch))) 654 return -EINVAL; 655 656 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) && 657 (!rdev->ops->start_nan || !rdev->ops->stop_nan || 658 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func || 659 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ))))) 660 return -EINVAL; 661 662 #ifndef CONFIG_WIRELESS_WDS 663 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))) 664 return -EINVAL; 665 #endif 666 667 /* 668 * if a wiphy has unsupported modes for regulatory channel enforcement, 669 * opt-out of enforcement checking 670 */ 671 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) | 672 BIT(NL80211_IFTYPE_P2P_CLIENT) | 673 BIT(NL80211_IFTYPE_AP) | 674 BIT(NL80211_IFTYPE_P2P_GO) | 675 BIT(NL80211_IFTYPE_ADHOC) | 676 BIT(NL80211_IFTYPE_P2P_DEVICE) | 677 BIT(NL80211_IFTYPE_NAN) | 678 BIT(NL80211_IFTYPE_AP_VLAN) | 679 BIT(NL80211_IFTYPE_MONITOR))) 680 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF; 681 682 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 683 (wiphy->regulatory_flags & 684 (REGULATORY_CUSTOM_REG | 685 REGULATORY_STRICT_REG | 686 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 687 REGULATORY_COUNTRY_IE_IGNORE)))) 688 return -EINVAL; 689 690 if (WARN_ON(wiphy->coalesce && 691 (!wiphy->coalesce->n_rules || 692 !wiphy->coalesce->n_patterns) && 693 (!wiphy->coalesce->pattern_min_len || 694 wiphy->coalesce->pattern_min_len > 695 wiphy->coalesce->pattern_max_len))) 696 return -EINVAL; 697 698 if (WARN_ON(wiphy->ap_sme_capa && 699 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 700 return -EINVAL; 701 702 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 703 return -EINVAL; 704 705 if (WARN_ON(wiphy->addresses && 706 !is_zero_ether_addr(wiphy->perm_addr) && 707 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 708 ETH_ALEN))) 709 return -EINVAL; 710 711 if (WARN_ON(wiphy->max_acl_mac_addrs && 712 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 713 !rdev->ops->set_mac_acl))) 714 return -EINVAL; 715 716 /* assure only valid behaviours are flagged by driver 717 * hence subtract 2 as bit 0 is invalid. 718 */ 719 if (WARN_ON(wiphy->bss_select_support && 720 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 721 return -EINVAL; 722 723 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy, 724 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) && 725 (!rdev->ops->set_pmk || !rdev->ops->del_pmk))) 726 return -EINVAL; 727 728 if (wiphy->addresses) 729 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 730 731 /* sanity check ifmodes */ 732 WARN_ON(!ifmodes); 733 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 734 if (WARN_ON(ifmodes != wiphy->interface_modes)) 735 wiphy->interface_modes = ifmodes; 736 737 res = wiphy_verify_combinations(wiphy); 738 if (res) 739 return res; 740 741 /* sanity check supported bands/channels */ 742 for (band = 0; band < NUM_NL80211_BANDS; band++) { 743 sband = wiphy->bands[band]; 744 if (!sband) 745 continue; 746 747 sband->band = band; 748 if (WARN_ON(!sband->n_channels)) 749 return -EINVAL; 750 /* 751 * on 60GHz band, there are no legacy rates, so 752 * n_bitrates is 0 753 */ 754 if (WARN_ON(band != NL80211_BAND_60GHZ && 755 !sband->n_bitrates)) 756 return -EINVAL; 757 758 /* 759 * Since cfg80211_disable_40mhz_24ghz is global, we can 760 * modify the sband's ht data even if the driver uses a 761 * global structure for that. 762 */ 763 if (cfg80211_disable_40mhz_24ghz && 764 band == NL80211_BAND_2GHZ && 765 sband->ht_cap.ht_supported) { 766 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 767 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 768 } 769 770 /* 771 * Since we use a u32 for rate bitmaps in 772 * ieee80211_get_response_rate, we cannot 773 * have more than 32 legacy rates. 774 */ 775 if (WARN_ON(sband->n_bitrates > 32)) 776 return -EINVAL; 777 778 for (i = 0; i < sband->n_channels; i++) { 779 sband->channels[i].orig_flags = 780 sband->channels[i].flags; 781 sband->channels[i].orig_mag = INT_MAX; 782 sband->channels[i].orig_mpwr = 783 sband->channels[i].max_power; 784 sband->channels[i].band = band; 785 } 786 787 have_band = true; 788 } 789 790 if (!have_band) { 791 WARN_ON(1); 792 return -EINVAL; 793 } 794 795 #ifdef CONFIG_PM 796 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 797 (!rdev->wiphy.wowlan->pattern_min_len || 798 rdev->wiphy.wowlan->pattern_min_len > 799 rdev->wiphy.wowlan->pattern_max_len))) 800 return -EINVAL; 801 #endif 802 803 /* check and set up bitrates */ 804 ieee80211_set_bitrate_flags(wiphy); 805 806 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 807 808 rtnl_lock(); 809 res = device_add(&rdev->wiphy.dev); 810 if (res) { 811 rtnl_unlock(); 812 return res; 813 } 814 815 /* set up regulatory info */ 816 wiphy_regulatory_register(wiphy); 817 818 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 819 cfg80211_rdev_list_generation++; 820 821 /* add to debugfs */ 822 rdev->wiphy.debugfsdir = 823 debugfs_create_dir(wiphy_name(&rdev->wiphy), 824 ieee80211_debugfs_dir); 825 if (IS_ERR(rdev->wiphy.debugfsdir)) 826 rdev->wiphy.debugfsdir = NULL; 827 828 cfg80211_debugfs_rdev_add(rdev); 829 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 830 831 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 832 struct regulatory_request request; 833 834 request.wiphy_idx = get_wiphy_idx(wiphy); 835 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 836 request.alpha2[0] = '9'; 837 request.alpha2[1] = '9'; 838 839 nl80211_send_reg_change_event(&request); 840 } 841 842 /* Check that nobody globally advertises any capabilities they do not 843 * advertise on all possible interface types. 844 */ 845 if (wiphy->extended_capabilities_len && 846 wiphy->num_iftype_ext_capab && 847 wiphy->iftype_ext_capab) { 848 u8 supported_on_all, j; 849 const struct wiphy_iftype_ext_capab *capab; 850 851 capab = wiphy->iftype_ext_capab; 852 for (j = 0; j < wiphy->extended_capabilities_len; j++) { 853 if (capab[0].extended_capabilities_len > j) 854 supported_on_all = 855 capab[0].extended_capabilities[j]; 856 else 857 supported_on_all = 0x00; 858 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) { 859 if (j >= capab[i].extended_capabilities_len) { 860 supported_on_all = 0x00; 861 break; 862 } 863 supported_on_all &= 864 capab[i].extended_capabilities[j]; 865 } 866 if (WARN_ON(wiphy->extended_capabilities[j] & 867 ~supported_on_all)) 868 break; 869 } 870 } 871 872 rdev->wiphy.registered = true; 873 rtnl_unlock(); 874 875 res = rfkill_register(rdev->rfkill); 876 if (res) { 877 rfkill_destroy(rdev->rfkill); 878 rdev->rfkill = NULL; 879 wiphy_unregister(&rdev->wiphy); 880 return res; 881 } 882 883 return 0; 884 } 885 EXPORT_SYMBOL(wiphy_register); 886 887 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 888 { 889 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 890 891 if (!rdev->ops->rfkill_poll) 892 return; 893 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 894 rfkill_resume_polling(rdev->rfkill); 895 } 896 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 897 898 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 899 { 900 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 901 902 rfkill_pause_polling(rdev->rfkill); 903 } 904 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 905 906 void wiphy_unregister(struct wiphy *wiphy) 907 { 908 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 909 910 wait_event(rdev->dev_wait, ({ 911 int __count; 912 rtnl_lock(); 913 __count = rdev->opencount; 914 rtnl_unlock(); 915 __count == 0; })); 916 917 if (rdev->rfkill) 918 rfkill_unregister(rdev->rfkill); 919 920 rtnl_lock(); 921 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 922 rdev->wiphy.registered = false; 923 924 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 925 926 /* 927 * First remove the hardware from everywhere, this makes 928 * it impossible to find from userspace. 929 */ 930 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 931 list_del_rcu(&rdev->list); 932 synchronize_rcu(); 933 934 /* 935 * If this device got a regulatory hint tell core its 936 * free to listen now to a new shiny device regulatory hint 937 */ 938 wiphy_regulatory_deregister(wiphy); 939 940 cfg80211_rdev_list_generation++; 941 device_del(&rdev->wiphy.dev); 942 943 rtnl_unlock(); 944 945 flush_work(&rdev->scan_done_wk); 946 cancel_work_sync(&rdev->conn_work); 947 flush_work(&rdev->event_work); 948 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 949 flush_work(&rdev->destroy_work); 950 flush_work(&rdev->sched_scan_stop_wk); 951 flush_work(&rdev->mlme_unreg_wk); 952 flush_work(&rdev->propagate_radar_detect_wk); 953 flush_work(&rdev->propagate_cac_done_wk); 954 955 #ifdef CONFIG_PM 956 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 957 rdev_set_wakeup(rdev, false); 958 #endif 959 cfg80211_rdev_free_wowlan(rdev); 960 cfg80211_rdev_free_coalesce(rdev); 961 } 962 EXPORT_SYMBOL(wiphy_unregister); 963 964 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 965 { 966 struct cfg80211_internal_bss *scan, *tmp; 967 struct cfg80211_beacon_registration *reg, *treg; 968 rfkill_destroy(rdev->rfkill); 969 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 970 list_del(®->list); 971 kfree(reg); 972 } 973 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 974 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 975 kfree(rdev); 976 } 977 978 void wiphy_free(struct wiphy *wiphy) 979 { 980 put_device(&wiphy->dev); 981 } 982 EXPORT_SYMBOL(wiphy_free); 983 984 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 985 { 986 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 987 988 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 989 schedule_work(&rdev->rfkill_sync); 990 } 991 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 992 993 void cfg80211_cqm_config_free(struct wireless_dev *wdev) 994 { 995 kfree(wdev->cqm_config); 996 wdev->cqm_config = NULL; 997 } 998 999 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 1000 { 1001 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1002 1003 ASSERT_RTNL(); 1004 1005 if (WARN_ON(wdev->netdev)) 1006 return; 1007 1008 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 1009 1010 list_del_rcu(&wdev->list); 1011 rdev->devlist_generation++; 1012 1013 switch (wdev->iftype) { 1014 case NL80211_IFTYPE_P2P_DEVICE: 1015 cfg80211_mlme_purge_registrations(wdev); 1016 cfg80211_stop_p2p_device(rdev, wdev); 1017 break; 1018 case NL80211_IFTYPE_NAN: 1019 cfg80211_stop_nan(rdev, wdev); 1020 break; 1021 default: 1022 WARN_ON_ONCE(1); 1023 break; 1024 } 1025 1026 cfg80211_cqm_config_free(wdev); 1027 } 1028 EXPORT_SYMBOL(cfg80211_unregister_wdev); 1029 1030 static const struct device_type wiphy_type = { 1031 .name = "wlan", 1032 }; 1033 1034 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 1035 enum nl80211_iftype iftype, int num) 1036 { 1037 ASSERT_RTNL(); 1038 1039 rdev->num_running_ifaces += num; 1040 if (iftype == NL80211_IFTYPE_MONITOR) 1041 rdev->num_running_monitor_ifaces += num; 1042 } 1043 1044 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 1045 struct wireless_dev *wdev) 1046 { 1047 struct net_device *dev = wdev->netdev; 1048 struct cfg80211_sched_scan_request *pos, *tmp; 1049 1050 ASSERT_RTNL(); 1051 ASSERT_WDEV_LOCK(wdev); 1052 1053 switch (wdev->iftype) { 1054 case NL80211_IFTYPE_ADHOC: 1055 __cfg80211_leave_ibss(rdev, dev, true); 1056 break; 1057 case NL80211_IFTYPE_P2P_CLIENT: 1058 case NL80211_IFTYPE_STATION: 1059 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, 1060 list) { 1061 if (dev == pos->dev) 1062 cfg80211_stop_sched_scan_req(rdev, pos, false); 1063 } 1064 1065 #ifdef CONFIG_CFG80211_WEXT 1066 kfree(wdev->wext.ie); 1067 wdev->wext.ie = NULL; 1068 wdev->wext.ie_len = 0; 1069 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1070 #endif 1071 cfg80211_disconnect(rdev, dev, 1072 WLAN_REASON_DEAUTH_LEAVING, true); 1073 break; 1074 case NL80211_IFTYPE_MESH_POINT: 1075 __cfg80211_leave_mesh(rdev, dev); 1076 break; 1077 case NL80211_IFTYPE_AP: 1078 case NL80211_IFTYPE_P2P_GO: 1079 __cfg80211_stop_ap(rdev, dev, true); 1080 break; 1081 case NL80211_IFTYPE_OCB: 1082 __cfg80211_leave_ocb(rdev, dev); 1083 break; 1084 case NL80211_IFTYPE_WDS: 1085 /* must be handled by mac80211/driver, has no APIs */ 1086 break; 1087 case NL80211_IFTYPE_P2P_DEVICE: 1088 case NL80211_IFTYPE_NAN: 1089 /* cannot happen, has no netdev */ 1090 break; 1091 case NL80211_IFTYPE_AP_VLAN: 1092 case NL80211_IFTYPE_MONITOR: 1093 /* nothing to do */ 1094 break; 1095 case NL80211_IFTYPE_UNSPECIFIED: 1096 case NUM_NL80211_IFTYPES: 1097 /* invalid */ 1098 break; 1099 } 1100 } 1101 1102 void cfg80211_leave(struct cfg80211_registered_device *rdev, 1103 struct wireless_dev *wdev) 1104 { 1105 wdev_lock(wdev); 1106 __cfg80211_leave(rdev, wdev); 1107 wdev_unlock(wdev); 1108 } 1109 1110 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 1111 gfp_t gfp) 1112 { 1113 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1114 struct cfg80211_event *ev; 1115 unsigned long flags; 1116 1117 trace_cfg80211_stop_iface(wiphy, wdev); 1118 1119 ev = kzalloc(sizeof(*ev), gfp); 1120 if (!ev) 1121 return; 1122 1123 ev->type = EVENT_STOPPED; 1124 1125 spin_lock_irqsave(&wdev->event_lock, flags); 1126 list_add_tail(&ev->list, &wdev->event_list); 1127 spin_unlock_irqrestore(&wdev->event_lock, flags); 1128 queue_work(cfg80211_wq, &rdev->event_work); 1129 } 1130 EXPORT_SYMBOL(cfg80211_stop_iface); 1131 1132 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 1133 unsigned long state, void *ptr) 1134 { 1135 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1136 struct wireless_dev *wdev = dev->ieee80211_ptr; 1137 struct cfg80211_registered_device *rdev; 1138 struct cfg80211_sched_scan_request *pos, *tmp; 1139 1140 if (!wdev) 1141 return NOTIFY_DONE; 1142 1143 rdev = wiphy_to_rdev(wdev->wiphy); 1144 1145 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 1146 1147 switch (state) { 1148 case NETDEV_POST_INIT: 1149 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 1150 break; 1151 case NETDEV_REGISTER: 1152 /* 1153 * NB: cannot take rdev->mtx here because this may be 1154 * called within code protected by it when interfaces 1155 * are added with nl80211. 1156 */ 1157 mutex_init(&wdev->mtx); 1158 INIT_LIST_HEAD(&wdev->event_list); 1159 spin_lock_init(&wdev->event_lock); 1160 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1161 spin_lock_init(&wdev->mgmt_registrations_lock); 1162 1163 /* 1164 * We get here also when the interface changes network namespaces, 1165 * as it's registered into the new one, but we don't want it to 1166 * change ID in that case. Checking if the ID is already assigned 1167 * works, because 0 isn't considered a valid ID and the memory is 1168 * 0-initialized. 1169 */ 1170 if (!wdev->identifier) 1171 wdev->identifier = ++rdev->wdev_id; 1172 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list); 1173 rdev->devlist_generation++; 1174 /* can only change netns with wiphy */ 1175 dev->features |= NETIF_F_NETNS_LOCAL; 1176 1177 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 1178 "phy80211")) { 1179 pr_err("failed to add phy80211 symlink to netdev!\n"); 1180 } 1181 wdev->netdev = dev; 1182 #ifdef CONFIG_CFG80211_WEXT 1183 wdev->wext.default_key = -1; 1184 wdev->wext.default_mgmt_key = -1; 1185 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1186 #endif 1187 1188 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1189 wdev->ps = true; 1190 else 1191 wdev->ps = false; 1192 /* allow mac80211 to determine the timeout */ 1193 wdev->ps_timeout = -1; 1194 1195 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1196 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1197 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1198 dev->priv_flags |= IFF_DONT_BRIDGE; 1199 1200 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk); 1201 1202 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 1203 break; 1204 case NETDEV_GOING_DOWN: 1205 cfg80211_leave(rdev, wdev); 1206 break; 1207 case NETDEV_DOWN: 1208 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1209 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1210 if (WARN_ON(!rdev->scan_req->notified)) 1211 rdev->scan_req->info.aborted = true; 1212 ___cfg80211_scan_done(rdev, false); 1213 } 1214 1215 list_for_each_entry_safe(pos, tmp, 1216 &rdev->sched_scan_req_list, list) { 1217 if (WARN_ON(pos && pos->dev == wdev->netdev)) 1218 cfg80211_stop_sched_scan_req(rdev, pos, false); 1219 } 1220 1221 rdev->opencount--; 1222 wake_up(&rdev->dev_wait); 1223 break; 1224 case NETDEV_UP: 1225 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1226 wdev_lock(wdev); 1227 switch (wdev->iftype) { 1228 #ifdef CONFIG_CFG80211_WEXT 1229 case NL80211_IFTYPE_ADHOC: 1230 cfg80211_ibss_wext_join(rdev, wdev); 1231 break; 1232 case NL80211_IFTYPE_STATION: 1233 cfg80211_mgd_wext_connect(rdev, wdev); 1234 break; 1235 #endif 1236 #ifdef CONFIG_MAC80211_MESH 1237 case NL80211_IFTYPE_MESH_POINT: 1238 { 1239 /* backward compat code... */ 1240 struct mesh_setup setup; 1241 memcpy(&setup, &default_mesh_setup, 1242 sizeof(setup)); 1243 /* back compat only needed for mesh_id */ 1244 setup.mesh_id = wdev->ssid; 1245 setup.mesh_id_len = wdev->mesh_id_up_len; 1246 if (wdev->mesh_id_up_len) 1247 __cfg80211_join_mesh(rdev, dev, 1248 &setup, 1249 &default_mesh_config); 1250 break; 1251 } 1252 #endif 1253 default: 1254 break; 1255 } 1256 wdev_unlock(wdev); 1257 rdev->opencount++; 1258 1259 /* 1260 * Configure power management to the driver here so that its 1261 * correctly set also after interface type changes etc. 1262 */ 1263 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1264 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1265 rdev->ops->set_power_mgmt && 1266 rdev_set_power_mgmt(rdev, dev, wdev->ps, 1267 wdev->ps_timeout)) { 1268 /* assume this means it's off */ 1269 wdev->ps = false; 1270 } 1271 break; 1272 case NETDEV_UNREGISTER: 1273 /* 1274 * It is possible to get NETDEV_UNREGISTER 1275 * multiple times. To detect that, check 1276 * that the interface is still on the list 1277 * of registered interfaces, and only then 1278 * remove and clean it up. 1279 */ 1280 if (!list_empty(&wdev->list)) { 1281 nl80211_notify_iface(rdev, wdev, 1282 NL80211_CMD_DEL_INTERFACE); 1283 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 1284 list_del_rcu(&wdev->list); 1285 rdev->devlist_generation++; 1286 cfg80211_mlme_purge_registrations(wdev); 1287 #ifdef CONFIG_CFG80211_WEXT 1288 kzfree(wdev->wext.keys); 1289 #endif 1290 flush_work(&wdev->disconnect_wk); 1291 cfg80211_cqm_config_free(wdev); 1292 } 1293 /* 1294 * synchronise (so that we won't find this netdev 1295 * from other code any more) and then clear the list 1296 * head so that the above code can safely check for 1297 * !list_empty() to avoid double-cleanup. 1298 */ 1299 synchronize_rcu(); 1300 INIT_LIST_HEAD(&wdev->list); 1301 /* 1302 * Ensure that all events have been processed and 1303 * freed. 1304 */ 1305 cfg80211_process_wdev_events(wdev); 1306 1307 if (WARN_ON(wdev->current_bss)) { 1308 cfg80211_unhold_bss(wdev->current_bss); 1309 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 1310 wdev->current_bss = NULL; 1311 } 1312 break; 1313 case NETDEV_PRE_UP: 1314 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 1315 return notifier_from_errno(-EOPNOTSUPP); 1316 if (rfkill_blocked(rdev->rfkill)) 1317 return notifier_from_errno(-ERFKILL); 1318 break; 1319 default: 1320 return NOTIFY_DONE; 1321 } 1322 1323 wireless_nlevent_flush(); 1324 1325 return NOTIFY_OK; 1326 } 1327 1328 static struct notifier_block cfg80211_netdev_notifier = { 1329 .notifier_call = cfg80211_netdev_notifier_call, 1330 }; 1331 1332 static void __net_exit cfg80211_pernet_exit(struct net *net) 1333 { 1334 struct cfg80211_registered_device *rdev; 1335 1336 rtnl_lock(); 1337 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1338 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1339 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1340 } 1341 rtnl_unlock(); 1342 } 1343 1344 static struct pernet_operations cfg80211_pernet_ops = { 1345 .exit = cfg80211_pernet_exit, 1346 }; 1347 1348 static int __init cfg80211_init(void) 1349 { 1350 int err; 1351 1352 err = register_pernet_device(&cfg80211_pernet_ops); 1353 if (err) 1354 goto out_fail_pernet; 1355 1356 err = wiphy_sysfs_init(); 1357 if (err) 1358 goto out_fail_sysfs; 1359 1360 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1361 if (err) 1362 goto out_fail_notifier; 1363 1364 err = nl80211_init(); 1365 if (err) 1366 goto out_fail_nl80211; 1367 1368 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1369 1370 err = regulatory_init(); 1371 if (err) 1372 goto out_fail_reg; 1373 1374 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM); 1375 if (!cfg80211_wq) { 1376 err = -ENOMEM; 1377 goto out_fail_wq; 1378 } 1379 1380 return 0; 1381 1382 out_fail_wq: 1383 regulatory_exit(); 1384 out_fail_reg: 1385 debugfs_remove(ieee80211_debugfs_dir); 1386 nl80211_exit(); 1387 out_fail_nl80211: 1388 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1389 out_fail_notifier: 1390 wiphy_sysfs_exit(); 1391 out_fail_sysfs: 1392 unregister_pernet_device(&cfg80211_pernet_ops); 1393 out_fail_pernet: 1394 return err; 1395 } 1396 fs_initcall(cfg80211_init); 1397 1398 static void __exit cfg80211_exit(void) 1399 { 1400 debugfs_remove(ieee80211_debugfs_dir); 1401 nl80211_exit(); 1402 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1403 wiphy_sysfs_exit(); 1404 regulatory_exit(); 1405 unregister_pernet_device(&cfg80211_pernet_ops); 1406 destroy_workqueue(cfg80211_wq); 1407 } 1408 module_exit(cfg80211_exit); 1409