1 /* 2 * This is the linux wireless configuration interface. 3 * 4 * Copyright 2006-2009 Johannes Berg <johannes@sipsolutions.net> 5 */ 6 7 #include <linux/if.h> 8 #include <linux/module.h> 9 #include <linux/err.h> 10 #include <linux/list.h> 11 #include <linux/nl80211.h> 12 #include <linux/debugfs.h> 13 #include <linux/notifier.h> 14 #include <linux/device.h> 15 #include <linux/etherdevice.h> 16 #include <linux/rtnetlink.h> 17 #include <net/genetlink.h> 18 #include <net/cfg80211.h> 19 #include "nl80211.h" 20 #include "core.h" 21 #include "sysfs.h" 22 #include "debugfs.h" 23 #include "wext-compat.h" 24 25 /* name for sysfs, %d is appended */ 26 #define PHY_NAME "phy" 27 28 MODULE_AUTHOR("Johannes Berg"); 29 MODULE_LICENSE("GPL"); 30 MODULE_DESCRIPTION("wireless configuration support"); 31 32 /* RCU might be appropriate here since we usually 33 * only read the list, and that can happen quite 34 * often because we need to do it for each command */ 35 LIST_HEAD(cfg80211_rdev_list); 36 int cfg80211_rdev_list_generation; 37 38 /* 39 * This is used to protect the cfg80211_rdev_list 40 */ 41 DEFINE_MUTEX(cfg80211_mutex); 42 43 /* for debugfs */ 44 static struct dentry *ieee80211_debugfs_dir; 45 46 /* requires cfg80211_mutex to be held! */ 47 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx) 48 { 49 struct cfg80211_registered_device *result = NULL, *rdev; 50 51 if (!wiphy_idx_valid(wiphy_idx)) 52 return NULL; 53 54 assert_cfg80211_lock(); 55 56 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 57 if (rdev->wiphy_idx == wiphy_idx) { 58 result = rdev; 59 break; 60 } 61 } 62 63 return result; 64 } 65 66 int get_wiphy_idx(struct wiphy *wiphy) 67 { 68 struct cfg80211_registered_device *rdev; 69 if (!wiphy) 70 return WIPHY_IDX_STALE; 71 rdev = wiphy_to_dev(wiphy); 72 return rdev->wiphy_idx; 73 } 74 75 /* requires cfg80211_rdev_mutex to be held! */ 76 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx) 77 { 78 struct cfg80211_registered_device *rdev; 79 80 if (!wiphy_idx_valid(wiphy_idx)) 81 return NULL; 82 83 assert_cfg80211_lock(); 84 85 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx); 86 if (!rdev) 87 return NULL; 88 return &rdev->wiphy; 89 } 90 91 /* requires cfg80211_mutex to be held! */ 92 struct cfg80211_registered_device * 93 __cfg80211_rdev_from_info(struct genl_info *info) 94 { 95 int ifindex; 96 struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL; 97 struct net_device *dev; 98 int err = -EINVAL; 99 100 assert_cfg80211_lock(); 101 102 if (info->attrs[NL80211_ATTR_WIPHY]) { 103 bywiphyidx = cfg80211_rdev_by_wiphy_idx( 104 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY])); 105 err = -ENODEV; 106 } 107 108 if (info->attrs[NL80211_ATTR_IFINDEX]) { 109 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]); 110 dev = dev_get_by_index(genl_info_net(info), ifindex); 111 if (dev) { 112 if (dev->ieee80211_ptr) 113 byifidx = 114 wiphy_to_dev(dev->ieee80211_ptr->wiphy); 115 dev_put(dev); 116 } 117 err = -ENODEV; 118 } 119 120 if (bywiphyidx && byifidx) { 121 if (bywiphyidx != byifidx) 122 return ERR_PTR(-EINVAL); 123 else 124 return bywiphyidx; /* == byifidx */ 125 } 126 if (bywiphyidx) 127 return bywiphyidx; 128 129 if (byifidx) 130 return byifidx; 131 132 return ERR_PTR(err); 133 } 134 135 struct cfg80211_registered_device * 136 cfg80211_get_dev_from_info(struct genl_info *info) 137 { 138 struct cfg80211_registered_device *rdev; 139 140 mutex_lock(&cfg80211_mutex); 141 rdev = __cfg80211_rdev_from_info(info); 142 143 /* if it is not an error we grab the lock on 144 * it to assure it won't be going away while 145 * we operate on it */ 146 if (!IS_ERR(rdev)) 147 mutex_lock(&rdev->mtx); 148 149 mutex_unlock(&cfg80211_mutex); 150 151 return rdev; 152 } 153 154 struct cfg80211_registered_device * 155 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) 156 { 157 struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV); 158 struct net_device *dev; 159 160 mutex_lock(&cfg80211_mutex); 161 dev = dev_get_by_index(net, ifindex); 162 if (!dev) 163 goto out; 164 if (dev->ieee80211_ptr) { 165 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy); 166 mutex_lock(&rdev->mtx); 167 } else 168 rdev = ERR_PTR(-ENODEV); 169 dev_put(dev); 170 out: 171 mutex_unlock(&cfg80211_mutex); 172 return rdev; 173 } 174 175 /* requires cfg80211_mutex to be held */ 176 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, 177 char *newname) 178 { 179 struct cfg80211_registered_device *rdev2; 180 int wiphy_idx, taken = -1, result, digits; 181 182 assert_cfg80211_lock(); 183 184 /* prohibit calling the thing phy%d when %d is not its number */ 185 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken); 186 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) { 187 /* count number of places needed to print wiphy_idx */ 188 digits = 1; 189 while (wiphy_idx /= 10) 190 digits++; 191 /* 192 * deny the name if it is phy<idx> where <idx> is printed 193 * without leading zeroes. taken == strlen(newname) here 194 */ 195 if (taken == strlen(PHY_NAME) + digits) 196 return -EINVAL; 197 } 198 199 200 /* Ignore nop renames */ 201 if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0) 202 return 0; 203 204 /* Ensure another device does not already have this name. */ 205 list_for_each_entry(rdev2, &cfg80211_rdev_list, list) 206 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0) 207 return -EINVAL; 208 209 result = device_rename(&rdev->wiphy.dev, newname); 210 if (result) 211 return result; 212 213 if (rdev->wiphy.debugfsdir && 214 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent, 215 rdev->wiphy.debugfsdir, 216 rdev->wiphy.debugfsdir->d_parent, 217 newname)) 218 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n", 219 newname); 220 221 nl80211_notify_dev_rename(rdev); 222 223 return 0; 224 } 225 226 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, 227 struct net *net) 228 { 229 struct wireless_dev *wdev; 230 int err = 0; 231 232 if (!rdev->wiphy.netnsok) 233 return -EOPNOTSUPP; 234 235 list_for_each_entry(wdev, &rdev->netdev_list, list) { 236 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 237 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); 238 if (err) 239 break; 240 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 241 } 242 243 if (err) { 244 /* failed -- clean up to old netns */ 245 net = wiphy_net(&rdev->wiphy); 246 247 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list, 248 list) { 249 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 250 err = dev_change_net_namespace(wdev->netdev, net, 251 "wlan%d"); 252 WARN_ON(err); 253 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 254 } 255 } 256 257 wiphy_net_set(&rdev->wiphy, net); 258 259 return err; 260 } 261 262 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data) 263 { 264 struct cfg80211_registered_device *rdev = data; 265 266 rdev->ops->rfkill_poll(&rdev->wiphy); 267 } 268 269 static int cfg80211_rfkill_set_block(void *data, bool blocked) 270 { 271 struct cfg80211_registered_device *rdev = data; 272 struct wireless_dev *wdev; 273 274 if (!blocked) 275 return 0; 276 277 rtnl_lock(); 278 mutex_lock(&rdev->devlist_mtx); 279 280 list_for_each_entry(wdev, &rdev->netdev_list, list) 281 dev_close(wdev->netdev); 282 283 mutex_unlock(&rdev->devlist_mtx); 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_lock_rdev(rdev); 306 307 cfg80211_process_rdev_events(rdev); 308 cfg80211_unlock_rdev(rdev); 309 rtnl_unlock(); 310 } 311 312 /* exported functions */ 313 314 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv) 315 { 316 static int wiphy_counter; 317 318 struct cfg80211_registered_device *rdev; 319 int alloc_size; 320 321 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 322 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 323 WARN_ON(ops->connect && !ops->disconnect); 324 WARN_ON(ops->join_ibss && !ops->leave_ibss); 325 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 326 WARN_ON(ops->add_station && !ops->del_station); 327 WARN_ON(ops->add_mpath && !ops->del_mpath); 328 329 alloc_size = sizeof(*rdev) + sizeof_priv; 330 331 rdev = kzalloc(alloc_size, GFP_KERNEL); 332 if (!rdev) 333 return NULL; 334 335 rdev->ops = ops; 336 337 mutex_lock(&cfg80211_mutex); 338 339 rdev->wiphy_idx = wiphy_counter++; 340 341 if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) { 342 wiphy_counter--; 343 mutex_unlock(&cfg80211_mutex); 344 /* ugh, wrapped! */ 345 kfree(rdev); 346 return NULL; 347 } 348 349 mutex_unlock(&cfg80211_mutex); 350 351 /* give it a proper name */ 352 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 353 354 mutex_init(&rdev->mtx); 355 mutex_init(&rdev->devlist_mtx); 356 INIT_LIST_HEAD(&rdev->netdev_list); 357 spin_lock_init(&rdev->bss_lock); 358 INIT_LIST_HEAD(&rdev->bss_list); 359 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 360 361 device_initialize(&rdev->wiphy.dev); 362 rdev->wiphy.dev.class = &ieee80211_class; 363 rdev->wiphy.dev.platform_data = rdev; 364 365 rdev->wiphy.ps_default = CONFIG_CFG80211_DEFAULT_PS_VALUE; 366 367 wiphy_net_set(&rdev->wiphy, &init_net); 368 369 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 370 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 371 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 372 &rdev->rfkill_ops, rdev); 373 374 if (!rdev->rfkill) { 375 kfree(rdev); 376 return NULL; 377 } 378 379 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); 380 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 381 INIT_WORK(&rdev->event_work, cfg80211_event_work); 382 383 init_waitqueue_head(&rdev->dev_wait); 384 385 /* 386 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 387 * Fragmentation and RTS threshold are disabled by default with the 388 * special -1 value. 389 */ 390 rdev->wiphy.retry_short = 7; 391 rdev->wiphy.retry_long = 4; 392 rdev->wiphy.frag_threshold = (u32) -1; 393 rdev->wiphy.rts_threshold = (u32) -1; 394 395 return &rdev->wiphy; 396 } 397 EXPORT_SYMBOL(wiphy_new); 398 399 int wiphy_register(struct wiphy *wiphy) 400 { 401 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 402 int res; 403 enum ieee80211_band band; 404 struct ieee80211_supported_band *sband; 405 bool have_band = false; 406 int i; 407 u16 ifmodes = wiphy->interface_modes; 408 409 /* sanity check ifmodes */ 410 WARN_ON(!ifmodes); 411 ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1; 412 if (WARN_ON(ifmodes != wiphy->interface_modes)) 413 wiphy->interface_modes = ifmodes; 414 415 /* sanity check supported bands/channels */ 416 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 417 sband = wiphy->bands[band]; 418 if (!sband) 419 continue; 420 421 sband->band = band; 422 423 if (WARN_ON(!sband->n_channels || !sband->n_bitrates)) 424 return -EINVAL; 425 426 /* 427 * Since we use a u32 for rate bitmaps in 428 * ieee80211_get_response_rate, we cannot 429 * have more than 32 legacy rates. 430 */ 431 if (WARN_ON(sband->n_bitrates > 32)) 432 return -EINVAL; 433 434 for (i = 0; i < sband->n_channels; i++) { 435 sband->channels[i].orig_flags = 436 sband->channels[i].flags; 437 sband->channels[i].orig_mag = 438 sband->channels[i].max_antenna_gain; 439 sband->channels[i].orig_mpwr = 440 sband->channels[i].max_power; 441 sband->channels[i].band = band; 442 } 443 444 have_band = true; 445 } 446 447 if (!have_band) { 448 WARN_ON(1); 449 return -EINVAL; 450 } 451 452 /* check and set up bitrates */ 453 ieee80211_set_bitrate_flags(wiphy); 454 455 res = device_add(&rdev->wiphy.dev); 456 if (res) 457 return res; 458 459 res = rfkill_register(rdev->rfkill); 460 if (res) 461 goto out_rm_dev; 462 463 mutex_lock(&cfg80211_mutex); 464 465 /* set up regulatory info */ 466 wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE); 467 468 list_add(&rdev->list, &cfg80211_rdev_list); 469 cfg80211_rdev_list_generation++; 470 471 mutex_unlock(&cfg80211_mutex); 472 473 /* add to debugfs */ 474 rdev->wiphy.debugfsdir = 475 debugfs_create_dir(wiphy_name(&rdev->wiphy), 476 ieee80211_debugfs_dir); 477 if (IS_ERR(rdev->wiphy.debugfsdir)) 478 rdev->wiphy.debugfsdir = NULL; 479 480 if (wiphy->custom_regulatory) { 481 struct regulatory_request request; 482 483 request.wiphy_idx = get_wiphy_idx(wiphy); 484 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 485 request.alpha2[0] = '9'; 486 request.alpha2[1] = '9'; 487 488 nl80211_send_reg_change_event(&request); 489 } 490 491 cfg80211_debugfs_rdev_add(rdev); 492 493 return 0; 494 495 out_rm_dev: 496 device_del(&rdev->wiphy.dev); 497 return res; 498 } 499 EXPORT_SYMBOL(wiphy_register); 500 501 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 502 { 503 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 504 505 if (!rdev->ops->rfkill_poll) 506 return; 507 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 508 rfkill_resume_polling(rdev->rfkill); 509 } 510 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 511 512 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 513 { 514 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 515 516 rfkill_pause_polling(rdev->rfkill); 517 } 518 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 519 520 void wiphy_unregister(struct wiphy *wiphy) 521 { 522 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 523 524 rfkill_unregister(rdev->rfkill); 525 526 /* protect the device list */ 527 mutex_lock(&cfg80211_mutex); 528 529 wait_event(rdev->dev_wait, ({ 530 int __count; 531 mutex_lock(&rdev->devlist_mtx); 532 __count = rdev->opencount; 533 mutex_unlock(&rdev->devlist_mtx); 534 __count == 0;})); 535 536 mutex_lock(&rdev->devlist_mtx); 537 BUG_ON(!list_empty(&rdev->netdev_list)); 538 mutex_unlock(&rdev->devlist_mtx); 539 540 /* 541 * First remove the hardware from everywhere, this makes 542 * it impossible to find from userspace. 543 */ 544 cfg80211_debugfs_rdev_del(rdev); 545 list_del(&rdev->list); 546 547 /* 548 * Try to grab rdev->mtx. If a command is still in progress, 549 * hopefully the driver will refuse it since it's tearing 550 * down the device already. We wait for this command to complete 551 * before unlinking the item from the list. 552 * Note: as codified by the BUG_ON above we cannot get here if 553 * a virtual interface is still present. Hence, we can only get 554 * to lock contention here if userspace issues a command that 555 * identified the hardware by wiphy index. 556 */ 557 cfg80211_lock_rdev(rdev); 558 /* nothing */ 559 cfg80211_unlock_rdev(rdev); 560 561 /* If this device got a regulatory hint tell core its 562 * free to listen now to a new shiny device regulatory hint */ 563 reg_device_remove(wiphy); 564 565 cfg80211_rdev_list_generation++; 566 device_del(&rdev->wiphy.dev); 567 debugfs_remove(rdev->wiphy.debugfsdir); 568 569 mutex_unlock(&cfg80211_mutex); 570 571 flush_work(&rdev->scan_done_wk); 572 cancel_work_sync(&rdev->conn_work); 573 flush_work(&rdev->event_work); 574 } 575 EXPORT_SYMBOL(wiphy_unregister); 576 577 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 578 { 579 struct cfg80211_internal_bss *scan, *tmp; 580 rfkill_destroy(rdev->rfkill); 581 mutex_destroy(&rdev->mtx); 582 mutex_destroy(&rdev->devlist_mtx); 583 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 584 cfg80211_put_bss(&scan->pub); 585 kfree(rdev); 586 } 587 588 void wiphy_free(struct wiphy *wiphy) 589 { 590 put_device(&wiphy->dev); 591 } 592 EXPORT_SYMBOL(wiphy_free); 593 594 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 595 { 596 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 597 598 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 599 schedule_work(&rdev->rfkill_sync); 600 } 601 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 602 603 static void wdev_cleanup_work(struct work_struct *work) 604 { 605 struct wireless_dev *wdev; 606 struct cfg80211_registered_device *rdev; 607 608 wdev = container_of(work, struct wireless_dev, cleanup_work); 609 rdev = wiphy_to_dev(wdev->wiphy); 610 611 cfg80211_lock_rdev(rdev); 612 613 if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) { 614 rdev->scan_req->aborted = true; 615 ___cfg80211_scan_done(rdev, true); 616 } 617 618 cfg80211_unlock_rdev(rdev); 619 620 mutex_lock(&rdev->devlist_mtx); 621 rdev->opencount--; 622 mutex_unlock(&rdev->devlist_mtx); 623 wake_up(&rdev->dev_wait); 624 625 dev_put(wdev->netdev); 626 } 627 628 static int cfg80211_netdev_notifier_call(struct notifier_block * nb, 629 unsigned long state, 630 void *ndev) 631 { 632 struct net_device *dev = ndev; 633 struct wireless_dev *wdev = dev->ieee80211_ptr; 634 struct cfg80211_registered_device *rdev; 635 636 if (!wdev) 637 return NOTIFY_DONE; 638 639 rdev = wiphy_to_dev(wdev->wiphy); 640 641 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 642 643 switch (state) { 644 case NETDEV_REGISTER: 645 /* 646 * NB: cannot take rdev->mtx here because this may be 647 * called within code protected by it when interfaces 648 * are added with nl80211. 649 */ 650 mutex_init(&wdev->mtx); 651 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work); 652 INIT_LIST_HEAD(&wdev->event_list); 653 spin_lock_init(&wdev->event_lock); 654 mutex_lock(&rdev->devlist_mtx); 655 list_add(&wdev->list, &rdev->netdev_list); 656 rdev->devlist_generation++; 657 /* can only change netns with wiphy */ 658 dev->features |= NETIF_F_NETNS_LOCAL; 659 660 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 661 "phy80211")) { 662 printk(KERN_ERR "wireless: failed to add phy80211 " 663 "symlink to netdev!\n"); 664 } 665 wdev->netdev = dev; 666 wdev->sme_state = CFG80211_SME_IDLE; 667 mutex_unlock(&rdev->devlist_mtx); 668 #ifdef CONFIG_WIRELESS_EXT 669 if (!dev->wireless_handlers) 670 dev->wireless_handlers = &cfg80211_wext_handler; 671 wdev->wext.default_key = -1; 672 wdev->wext.default_mgmt_key = -1; 673 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 674 wdev->wext.ps = wdev->wiphy->ps_default; 675 wdev->wext.ps_timeout = 100; 676 if (rdev->ops->set_power_mgmt) 677 if (rdev->ops->set_power_mgmt(wdev->wiphy, dev, 678 wdev->wext.ps, 679 wdev->wext.ps_timeout)) { 680 /* assume this means it's off */ 681 wdev->wext.ps = false; 682 } 683 #endif 684 break; 685 case NETDEV_GOING_DOWN: 686 switch (wdev->iftype) { 687 case NL80211_IFTYPE_ADHOC: 688 cfg80211_leave_ibss(rdev, dev, true); 689 break; 690 case NL80211_IFTYPE_STATION: 691 wdev_lock(wdev); 692 #ifdef CONFIG_WIRELESS_EXT 693 kfree(wdev->wext.ie); 694 wdev->wext.ie = NULL; 695 wdev->wext.ie_len = 0; 696 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 697 #endif 698 __cfg80211_disconnect(rdev, dev, 699 WLAN_REASON_DEAUTH_LEAVING, true); 700 cfg80211_mlme_down(rdev, dev); 701 wdev_unlock(wdev); 702 break; 703 default: 704 break; 705 } 706 break; 707 case NETDEV_DOWN: 708 dev_hold(dev); 709 schedule_work(&wdev->cleanup_work); 710 break; 711 case NETDEV_UP: 712 /* 713 * If we have a really quick DOWN/UP succession we may 714 * have this work still pending ... cancel it and see 715 * if it was pending, in which case we need to account 716 * for some of the work it would have done. 717 */ 718 if (cancel_work_sync(&wdev->cleanup_work)) { 719 mutex_lock(&rdev->devlist_mtx); 720 rdev->opencount--; 721 mutex_unlock(&rdev->devlist_mtx); 722 dev_put(dev); 723 } 724 #ifdef CONFIG_WIRELESS_EXT 725 cfg80211_lock_rdev(rdev); 726 mutex_lock(&rdev->devlist_mtx); 727 wdev_lock(wdev); 728 switch (wdev->iftype) { 729 case NL80211_IFTYPE_ADHOC: 730 cfg80211_ibss_wext_join(rdev, wdev); 731 break; 732 case NL80211_IFTYPE_STATION: 733 cfg80211_mgd_wext_connect(rdev, wdev); 734 break; 735 default: 736 break; 737 } 738 wdev_unlock(wdev); 739 rdev->opencount++; 740 mutex_unlock(&rdev->devlist_mtx); 741 cfg80211_unlock_rdev(rdev); 742 #endif 743 break; 744 case NETDEV_UNREGISTER: 745 /* 746 * NB: cannot take rdev->mtx here because this may be 747 * called within code protected by it when interfaces 748 * are removed with nl80211. 749 */ 750 mutex_lock(&rdev->devlist_mtx); 751 /* 752 * It is possible to get NETDEV_UNREGISTER 753 * multiple times. To detect that, check 754 * that the interface is still on the list 755 * of registered interfaces, and only then 756 * remove and clean it up. 757 */ 758 if (!list_empty(&wdev->list)) { 759 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 760 list_del_init(&wdev->list); 761 rdev->devlist_generation++; 762 #ifdef CONFIG_WIRELESS_EXT 763 kfree(wdev->wext.keys); 764 #endif 765 } 766 mutex_unlock(&rdev->devlist_mtx); 767 break; 768 case NETDEV_PRE_UP: 769 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 770 return notifier_from_errno(-EOPNOTSUPP); 771 if (rfkill_blocked(rdev->rfkill)) 772 return notifier_from_errno(-ERFKILL); 773 break; 774 } 775 776 return NOTIFY_DONE; 777 } 778 779 static struct notifier_block cfg80211_netdev_notifier = { 780 .notifier_call = cfg80211_netdev_notifier_call, 781 }; 782 783 static void __net_exit cfg80211_pernet_exit(struct net *net) 784 { 785 struct cfg80211_registered_device *rdev; 786 787 rtnl_lock(); 788 mutex_lock(&cfg80211_mutex); 789 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 790 if (net_eq(wiphy_net(&rdev->wiphy), net)) 791 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 792 } 793 mutex_unlock(&cfg80211_mutex); 794 rtnl_unlock(); 795 } 796 797 static struct pernet_operations cfg80211_pernet_ops = { 798 .exit = cfg80211_pernet_exit, 799 }; 800 801 static int __init cfg80211_init(void) 802 { 803 int err; 804 805 err = register_pernet_device(&cfg80211_pernet_ops); 806 if (err) 807 goto out_fail_pernet; 808 809 err = wiphy_sysfs_init(); 810 if (err) 811 goto out_fail_sysfs; 812 813 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 814 if (err) 815 goto out_fail_notifier; 816 817 err = nl80211_init(); 818 if (err) 819 goto out_fail_nl80211; 820 821 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 822 823 err = regulatory_init(); 824 if (err) 825 goto out_fail_reg; 826 827 return 0; 828 829 out_fail_reg: 830 debugfs_remove(ieee80211_debugfs_dir); 831 out_fail_nl80211: 832 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 833 out_fail_notifier: 834 wiphy_sysfs_exit(); 835 out_fail_sysfs: 836 unregister_pernet_device(&cfg80211_pernet_ops); 837 out_fail_pernet: 838 return err; 839 } 840 subsys_initcall(cfg80211_init); 841 842 static void cfg80211_exit(void) 843 { 844 debugfs_remove(ieee80211_debugfs_dir); 845 nl80211_exit(); 846 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 847 wiphy_sysfs_exit(); 848 regulatory_exit(); 849 unregister_pernet_device(&cfg80211_pernet_ops); 850 } 851 module_exit(cfg80211_exit); 852