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 <linux/sched.h> 18 #include <net/genetlink.h> 19 #include <net/cfg80211.h> 20 #include "nl80211.h" 21 #include "core.h" 22 #include "sysfs.h" 23 #include "debugfs.h" 24 #include "wext-compat.h" 25 26 /* name for sysfs, %d is appended */ 27 #define PHY_NAME "phy" 28 29 MODULE_AUTHOR("Johannes Berg"); 30 MODULE_LICENSE("GPL"); 31 MODULE_DESCRIPTION("wireless configuration support"); 32 33 /* RCU might be appropriate here since we usually 34 * only read the list, and that can happen quite 35 * often because we need to do it for each command */ 36 LIST_HEAD(cfg80211_rdev_list); 37 int cfg80211_rdev_list_generation; 38 39 /* 40 * This is used to protect the cfg80211_rdev_list 41 */ 42 DEFINE_MUTEX(cfg80211_mutex); 43 44 /* for debugfs */ 45 static struct dentry *ieee80211_debugfs_dir; 46 47 /* requires cfg80211_mutex to be held! */ 48 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx) 49 { 50 struct cfg80211_registered_device *result = NULL, *rdev; 51 52 if (!wiphy_idx_valid(wiphy_idx)) 53 return NULL; 54 55 assert_cfg80211_lock(); 56 57 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 58 if (rdev->wiphy_idx == wiphy_idx) { 59 result = rdev; 60 break; 61 } 62 } 63 64 return result; 65 } 66 67 int get_wiphy_idx(struct wiphy *wiphy) 68 { 69 struct cfg80211_registered_device *rdev; 70 if (!wiphy) 71 return WIPHY_IDX_STALE; 72 rdev = wiphy_to_dev(wiphy); 73 return rdev->wiphy_idx; 74 } 75 76 /* requires cfg80211_rdev_mutex to be held! */ 77 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx) 78 { 79 struct cfg80211_registered_device *rdev; 80 81 if (!wiphy_idx_valid(wiphy_idx)) 82 return NULL; 83 84 assert_cfg80211_lock(); 85 86 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx); 87 if (!rdev) 88 return NULL; 89 return &rdev->wiphy; 90 } 91 92 /* requires cfg80211_mutex to be held! */ 93 struct cfg80211_registered_device * 94 __cfg80211_rdev_from_info(struct genl_info *info) 95 { 96 int ifindex; 97 struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL; 98 struct net_device *dev; 99 int err = -EINVAL; 100 101 assert_cfg80211_lock(); 102 103 if (info->attrs[NL80211_ATTR_WIPHY]) { 104 bywiphyidx = cfg80211_rdev_by_wiphy_idx( 105 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY])); 106 err = -ENODEV; 107 } 108 109 if (info->attrs[NL80211_ATTR_IFINDEX]) { 110 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]); 111 dev = dev_get_by_index(genl_info_net(info), ifindex); 112 if (dev) { 113 if (dev->ieee80211_ptr) 114 byifidx = 115 wiphy_to_dev(dev->ieee80211_ptr->wiphy); 116 dev_put(dev); 117 } 118 err = -ENODEV; 119 } 120 121 if (bywiphyidx && byifidx) { 122 if (bywiphyidx != byifidx) 123 return ERR_PTR(-EINVAL); 124 else 125 return bywiphyidx; /* == byifidx */ 126 } 127 if (bywiphyidx) 128 return bywiphyidx; 129 130 if (byifidx) 131 return byifidx; 132 133 return ERR_PTR(err); 134 } 135 136 struct cfg80211_registered_device * 137 cfg80211_get_dev_from_info(struct genl_info *info) 138 { 139 struct cfg80211_registered_device *rdev; 140 141 mutex_lock(&cfg80211_mutex); 142 rdev = __cfg80211_rdev_from_info(info); 143 144 /* if it is not an error we grab the lock on 145 * it to assure it won't be going away while 146 * we operate on it */ 147 if (!IS_ERR(rdev)) 148 mutex_lock(&rdev->mtx); 149 150 mutex_unlock(&cfg80211_mutex); 151 152 return rdev; 153 } 154 155 struct cfg80211_registered_device * 156 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) 157 { 158 struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV); 159 struct net_device *dev; 160 161 mutex_lock(&cfg80211_mutex); 162 dev = dev_get_by_index(net, ifindex); 163 if (!dev) 164 goto out; 165 if (dev->ieee80211_ptr) { 166 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy); 167 mutex_lock(&rdev->mtx); 168 } else 169 rdev = ERR_PTR(-ENODEV); 170 dev_put(dev); 171 out: 172 mutex_unlock(&cfg80211_mutex); 173 return rdev; 174 } 175 176 /* requires cfg80211_mutex to be held */ 177 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, 178 char *newname) 179 { 180 struct cfg80211_registered_device *rdev2; 181 int wiphy_idx, taken = -1, result, digits; 182 183 assert_cfg80211_lock(); 184 185 /* prohibit calling the thing phy%d when %d is not its number */ 186 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken); 187 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) { 188 /* count number of places needed to print wiphy_idx */ 189 digits = 1; 190 while (wiphy_idx /= 10) 191 digits++; 192 /* 193 * deny the name if it is phy<idx> where <idx> is printed 194 * without leading zeroes. taken == strlen(newname) here 195 */ 196 if (taken == strlen(PHY_NAME) + digits) 197 return -EINVAL; 198 } 199 200 201 /* Ignore nop renames */ 202 if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0) 203 return 0; 204 205 /* Ensure another device does not already have this name. */ 206 list_for_each_entry(rdev2, &cfg80211_rdev_list, list) 207 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0) 208 return -EINVAL; 209 210 result = device_rename(&rdev->wiphy.dev, newname); 211 if (result) 212 return result; 213 214 if (rdev->wiphy.debugfsdir && 215 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent, 216 rdev->wiphy.debugfsdir, 217 rdev->wiphy.debugfsdir->d_parent, 218 newname)) 219 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n", 220 newname); 221 222 nl80211_notify_dev_rename(rdev); 223 224 return 0; 225 } 226 227 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, 228 struct net *net) 229 { 230 struct wireless_dev *wdev; 231 int err = 0; 232 233 if (!rdev->wiphy.netnsok) 234 return -EOPNOTSUPP; 235 236 list_for_each_entry(wdev, &rdev->netdev_list, list) { 237 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 238 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); 239 if (err) 240 break; 241 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 242 } 243 244 if (err) { 245 /* failed -- clean up to old netns */ 246 net = wiphy_net(&rdev->wiphy); 247 248 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list, 249 list) { 250 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 251 err = dev_change_net_namespace(wdev->netdev, net, 252 "wlan%d"); 253 WARN_ON(err); 254 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 255 } 256 } 257 258 wiphy_net_set(&rdev->wiphy, net); 259 260 return err; 261 } 262 263 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data) 264 { 265 struct cfg80211_registered_device *rdev = data; 266 267 rdev->ops->rfkill_poll(&rdev->wiphy); 268 } 269 270 static int cfg80211_rfkill_set_block(void *data, bool blocked) 271 { 272 struct cfg80211_registered_device *rdev = data; 273 struct wireless_dev *wdev; 274 275 if (!blocked) 276 return 0; 277 278 rtnl_lock(); 279 mutex_lock(&rdev->devlist_mtx); 280 281 list_for_each_entry(wdev, &rdev->netdev_list, list) 282 dev_close(wdev->netdev); 283 284 mutex_unlock(&rdev->devlist_mtx); 285 rtnl_unlock(); 286 287 return 0; 288 } 289 290 static void cfg80211_rfkill_sync_work(struct work_struct *work) 291 { 292 struct cfg80211_registered_device *rdev; 293 294 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync); 295 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill)); 296 } 297 298 static void cfg80211_event_work(struct work_struct *work) 299 { 300 struct cfg80211_registered_device *rdev; 301 302 rdev = container_of(work, struct cfg80211_registered_device, 303 event_work); 304 305 rtnl_lock(); 306 cfg80211_lock_rdev(rdev); 307 308 cfg80211_process_rdev_events(rdev); 309 cfg80211_unlock_rdev(rdev); 310 rtnl_unlock(); 311 } 312 313 /* exported functions */ 314 315 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv) 316 { 317 static int wiphy_counter; 318 319 struct cfg80211_registered_device *rdev; 320 int alloc_size; 321 322 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 323 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 324 WARN_ON(ops->connect && !ops->disconnect); 325 WARN_ON(ops->join_ibss && !ops->leave_ibss); 326 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 327 WARN_ON(ops->add_station && !ops->del_station); 328 WARN_ON(ops->add_mpath && !ops->del_mpath); 329 330 alloc_size = sizeof(*rdev) + sizeof_priv; 331 332 rdev = kzalloc(alloc_size, GFP_KERNEL); 333 if (!rdev) 334 return NULL; 335 336 rdev->ops = ops; 337 338 mutex_lock(&cfg80211_mutex); 339 340 rdev->wiphy_idx = wiphy_counter++; 341 342 if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) { 343 wiphy_counter--; 344 mutex_unlock(&cfg80211_mutex); 345 /* ugh, wrapped! */ 346 kfree(rdev); 347 return NULL; 348 } 349 350 mutex_unlock(&cfg80211_mutex); 351 352 /* give it a proper name */ 353 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 354 355 mutex_init(&rdev->mtx); 356 mutex_init(&rdev->devlist_mtx); 357 INIT_LIST_HEAD(&rdev->netdev_list); 358 spin_lock_init(&rdev->bss_lock); 359 INIT_LIST_HEAD(&rdev->bss_list); 360 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 361 362 device_initialize(&rdev->wiphy.dev); 363 rdev->wiphy.dev.class = &ieee80211_class; 364 rdev->wiphy.dev.platform_data = rdev; 365 366 rdev->wiphy.ps_default = CONFIG_CFG80211_DEFAULT_PS_VALUE; 367 368 wiphy_net_set(&rdev->wiphy, &init_net); 369 370 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 371 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 372 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 373 &rdev->rfkill_ops, rdev); 374 375 if (!rdev->rfkill) { 376 kfree(rdev); 377 return NULL; 378 } 379 380 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); 381 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 382 INIT_WORK(&rdev->event_work, cfg80211_event_work); 383 384 init_waitqueue_head(&rdev->dev_wait); 385 386 /* 387 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 388 * Fragmentation and RTS threshold are disabled by default with the 389 * special -1 value. 390 */ 391 rdev->wiphy.retry_short = 7; 392 rdev->wiphy.retry_long = 4; 393 rdev->wiphy.frag_threshold = (u32) -1; 394 rdev->wiphy.rts_threshold = (u32) -1; 395 396 return &rdev->wiphy; 397 } 398 EXPORT_SYMBOL(wiphy_new); 399 400 int wiphy_register(struct wiphy *wiphy) 401 { 402 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 403 int res; 404 enum ieee80211_band band; 405 struct ieee80211_supported_band *sband; 406 bool have_band = false; 407 int i; 408 u16 ifmodes = wiphy->interface_modes; 409 410 /* sanity check ifmodes */ 411 WARN_ON(!ifmodes); 412 ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1; 413 if (WARN_ON(ifmodes != wiphy->interface_modes)) 414 wiphy->interface_modes = ifmodes; 415 416 /* sanity check supported bands/channels */ 417 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 418 sband = wiphy->bands[band]; 419 if (!sband) 420 continue; 421 422 sband->band = band; 423 424 if (WARN_ON(!sband->n_channels || !sband->n_bitrates)) 425 return -EINVAL; 426 427 /* 428 * Since we use a u32 for rate bitmaps in 429 * ieee80211_get_response_rate, we cannot 430 * have more than 32 legacy rates. 431 */ 432 if (WARN_ON(sband->n_bitrates > 32)) 433 return -EINVAL; 434 435 for (i = 0; i < sband->n_channels; i++) { 436 sband->channels[i].orig_flags = 437 sband->channels[i].flags; 438 sband->channels[i].orig_mag = 439 sband->channels[i].max_antenna_gain; 440 sband->channels[i].orig_mpwr = 441 sband->channels[i].max_power; 442 sband->channels[i].band = band; 443 } 444 445 have_band = true; 446 } 447 448 if (!have_band) { 449 WARN_ON(1); 450 return -EINVAL; 451 } 452 453 /* check and set up bitrates */ 454 ieee80211_set_bitrate_flags(wiphy); 455 456 res = device_add(&rdev->wiphy.dev); 457 if (res) 458 return res; 459 460 res = rfkill_register(rdev->rfkill); 461 if (res) 462 goto out_rm_dev; 463 464 mutex_lock(&cfg80211_mutex); 465 466 /* set up regulatory info */ 467 wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE); 468 469 list_add(&rdev->list, &cfg80211_rdev_list); 470 cfg80211_rdev_list_generation++; 471 472 mutex_unlock(&cfg80211_mutex); 473 474 /* add to debugfs */ 475 rdev->wiphy.debugfsdir = 476 debugfs_create_dir(wiphy_name(&rdev->wiphy), 477 ieee80211_debugfs_dir); 478 if (IS_ERR(rdev->wiphy.debugfsdir)) 479 rdev->wiphy.debugfsdir = NULL; 480 481 if (wiphy->custom_regulatory) { 482 struct regulatory_request request; 483 484 request.wiphy_idx = get_wiphy_idx(wiphy); 485 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 486 request.alpha2[0] = '9'; 487 request.alpha2[1] = '9'; 488 489 nl80211_send_reg_change_event(&request); 490 } 491 492 cfg80211_debugfs_rdev_add(rdev); 493 494 return 0; 495 496 out_rm_dev: 497 device_del(&rdev->wiphy.dev); 498 return res; 499 } 500 EXPORT_SYMBOL(wiphy_register); 501 502 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 503 { 504 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 505 506 if (!rdev->ops->rfkill_poll) 507 return; 508 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 509 rfkill_resume_polling(rdev->rfkill); 510 } 511 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 512 513 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 514 { 515 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 516 517 rfkill_pause_polling(rdev->rfkill); 518 } 519 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 520 521 void wiphy_unregister(struct wiphy *wiphy) 522 { 523 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 524 525 rfkill_unregister(rdev->rfkill); 526 527 /* protect the device list */ 528 mutex_lock(&cfg80211_mutex); 529 530 wait_event(rdev->dev_wait, ({ 531 int __count; 532 mutex_lock(&rdev->devlist_mtx); 533 __count = rdev->opencount; 534 mutex_unlock(&rdev->devlist_mtx); 535 __count == 0;})); 536 537 mutex_lock(&rdev->devlist_mtx); 538 BUG_ON(!list_empty(&rdev->netdev_list)); 539 mutex_unlock(&rdev->devlist_mtx); 540 541 /* 542 * First remove the hardware from everywhere, this makes 543 * it impossible to find from userspace. 544 */ 545 cfg80211_debugfs_rdev_del(rdev); 546 list_del(&rdev->list); 547 548 /* 549 * Try to grab rdev->mtx. If a command is still in progress, 550 * hopefully the driver will refuse it since it's tearing 551 * down the device already. We wait for this command to complete 552 * before unlinking the item from the list. 553 * Note: as codified by the BUG_ON above we cannot get here if 554 * a virtual interface is still present. Hence, we can only get 555 * to lock contention here if userspace issues a command that 556 * identified the hardware by wiphy index. 557 */ 558 cfg80211_lock_rdev(rdev); 559 /* nothing */ 560 cfg80211_unlock_rdev(rdev); 561 562 /* If this device got a regulatory hint tell core its 563 * free to listen now to a new shiny device regulatory hint */ 564 reg_device_remove(wiphy); 565 566 cfg80211_rdev_list_generation++; 567 device_del(&rdev->wiphy.dev); 568 debugfs_remove(rdev->wiphy.debugfsdir); 569 570 mutex_unlock(&cfg80211_mutex); 571 572 flush_work(&rdev->scan_done_wk); 573 cancel_work_sync(&rdev->conn_work); 574 flush_work(&rdev->event_work); 575 } 576 EXPORT_SYMBOL(wiphy_unregister); 577 578 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 579 { 580 struct cfg80211_internal_bss *scan, *tmp; 581 rfkill_destroy(rdev->rfkill); 582 mutex_destroy(&rdev->mtx); 583 mutex_destroy(&rdev->devlist_mtx); 584 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 585 cfg80211_put_bss(&scan->pub); 586 kfree(rdev); 587 } 588 589 void wiphy_free(struct wiphy *wiphy) 590 { 591 put_device(&wiphy->dev); 592 } 593 EXPORT_SYMBOL(wiphy_free); 594 595 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 596 { 597 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 598 599 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 600 schedule_work(&rdev->rfkill_sync); 601 } 602 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 603 604 static void wdev_cleanup_work(struct work_struct *work) 605 { 606 struct wireless_dev *wdev; 607 struct cfg80211_registered_device *rdev; 608 609 wdev = container_of(work, struct wireless_dev, cleanup_work); 610 rdev = wiphy_to_dev(wdev->wiphy); 611 612 cfg80211_lock_rdev(rdev); 613 614 if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) { 615 rdev->scan_req->aborted = true; 616 ___cfg80211_scan_done(rdev, true); 617 } 618 619 cfg80211_unlock_rdev(rdev); 620 621 mutex_lock(&rdev->devlist_mtx); 622 rdev->opencount--; 623 mutex_unlock(&rdev->devlist_mtx); 624 wake_up(&rdev->dev_wait); 625 626 dev_put(wdev->netdev); 627 } 628 629 static int cfg80211_netdev_notifier_call(struct notifier_block * nb, 630 unsigned long state, 631 void *ndev) 632 { 633 struct net_device *dev = ndev; 634 struct wireless_dev *wdev = dev->ieee80211_ptr; 635 struct cfg80211_registered_device *rdev; 636 637 if (!wdev) 638 return NOTIFY_DONE; 639 640 rdev = wiphy_to_dev(wdev->wiphy); 641 642 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 643 644 switch (state) { 645 case NETDEV_REGISTER: 646 /* 647 * NB: cannot take rdev->mtx here because this may be 648 * called within code protected by it when interfaces 649 * are added with nl80211. 650 */ 651 mutex_init(&wdev->mtx); 652 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work); 653 INIT_LIST_HEAD(&wdev->event_list); 654 spin_lock_init(&wdev->event_lock); 655 mutex_lock(&rdev->devlist_mtx); 656 list_add(&wdev->list, &rdev->netdev_list); 657 rdev->devlist_generation++; 658 /* can only change netns with wiphy */ 659 dev->features |= NETIF_F_NETNS_LOCAL; 660 661 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 662 "phy80211")) { 663 printk(KERN_ERR "wireless: failed to add phy80211 " 664 "symlink to netdev!\n"); 665 } 666 wdev->netdev = dev; 667 wdev->sme_state = CFG80211_SME_IDLE; 668 mutex_unlock(&rdev->devlist_mtx); 669 #ifdef CONFIG_WIRELESS_EXT 670 if (!dev->wireless_handlers) 671 dev->wireless_handlers = &cfg80211_wext_handler; 672 wdev->wext.default_key = -1; 673 wdev->wext.default_mgmt_key = -1; 674 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 675 wdev->wext.ps = wdev->wiphy->ps_default; 676 wdev->wext.ps_timeout = 100; 677 if (rdev->ops->set_power_mgmt) 678 if (rdev->ops->set_power_mgmt(wdev->wiphy, dev, 679 wdev->wext.ps, 680 wdev->wext.ps_timeout)) { 681 /* assume this means it's off */ 682 wdev->wext.ps = false; 683 } 684 #endif 685 break; 686 case NETDEV_GOING_DOWN: 687 switch (wdev->iftype) { 688 case NL80211_IFTYPE_ADHOC: 689 cfg80211_leave_ibss(rdev, dev, true); 690 break; 691 case NL80211_IFTYPE_STATION: 692 wdev_lock(wdev); 693 #ifdef CONFIG_WIRELESS_EXT 694 kfree(wdev->wext.ie); 695 wdev->wext.ie = NULL; 696 wdev->wext.ie_len = 0; 697 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 698 #endif 699 __cfg80211_disconnect(rdev, dev, 700 WLAN_REASON_DEAUTH_LEAVING, true); 701 cfg80211_mlme_down(rdev, dev); 702 wdev_unlock(wdev); 703 break; 704 default: 705 break; 706 } 707 break; 708 case NETDEV_DOWN: 709 dev_hold(dev); 710 schedule_work(&wdev->cleanup_work); 711 break; 712 case NETDEV_UP: 713 /* 714 * If we have a really quick DOWN/UP succession we may 715 * have this work still pending ... cancel it and see 716 * if it was pending, in which case we need to account 717 * for some of the work it would have done. 718 */ 719 if (cancel_work_sync(&wdev->cleanup_work)) { 720 mutex_lock(&rdev->devlist_mtx); 721 rdev->opencount--; 722 mutex_unlock(&rdev->devlist_mtx); 723 dev_put(dev); 724 } 725 #ifdef CONFIG_WIRELESS_EXT 726 cfg80211_lock_rdev(rdev); 727 mutex_lock(&rdev->devlist_mtx); 728 wdev_lock(wdev); 729 switch (wdev->iftype) { 730 case NL80211_IFTYPE_ADHOC: 731 cfg80211_ibss_wext_join(rdev, wdev); 732 break; 733 case NL80211_IFTYPE_STATION: 734 cfg80211_mgd_wext_connect(rdev, wdev); 735 break; 736 default: 737 break; 738 } 739 wdev_unlock(wdev); 740 rdev->opencount++; 741 mutex_unlock(&rdev->devlist_mtx); 742 cfg80211_unlock_rdev(rdev); 743 #endif 744 break; 745 case NETDEV_UNREGISTER: 746 /* 747 * NB: cannot take rdev->mtx here because this may be 748 * called within code protected by it when interfaces 749 * are removed with nl80211. 750 */ 751 mutex_lock(&rdev->devlist_mtx); 752 /* 753 * It is possible to get NETDEV_UNREGISTER 754 * multiple times. To detect that, check 755 * that the interface is still on the list 756 * of registered interfaces, and only then 757 * remove and clean it up. 758 */ 759 if (!list_empty(&wdev->list)) { 760 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 761 list_del_init(&wdev->list); 762 rdev->devlist_generation++; 763 #ifdef CONFIG_WIRELESS_EXT 764 kfree(wdev->wext.keys); 765 #endif 766 } 767 mutex_unlock(&rdev->devlist_mtx); 768 break; 769 case NETDEV_PRE_UP: 770 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 771 return notifier_from_errno(-EOPNOTSUPP); 772 if (rfkill_blocked(rdev->rfkill)) 773 return notifier_from_errno(-ERFKILL); 774 break; 775 } 776 777 return NOTIFY_DONE; 778 } 779 780 static struct notifier_block cfg80211_netdev_notifier = { 781 .notifier_call = cfg80211_netdev_notifier_call, 782 }; 783 784 static void __net_exit cfg80211_pernet_exit(struct net *net) 785 { 786 struct cfg80211_registered_device *rdev; 787 788 rtnl_lock(); 789 mutex_lock(&cfg80211_mutex); 790 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 791 if (net_eq(wiphy_net(&rdev->wiphy), net)) 792 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 793 } 794 mutex_unlock(&cfg80211_mutex); 795 rtnl_unlock(); 796 } 797 798 static struct pernet_operations cfg80211_pernet_ops = { 799 .exit = cfg80211_pernet_exit, 800 }; 801 802 static int __init cfg80211_init(void) 803 { 804 int err; 805 806 err = register_pernet_device(&cfg80211_pernet_ops); 807 if (err) 808 goto out_fail_pernet; 809 810 err = wiphy_sysfs_init(); 811 if (err) 812 goto out_fail_sysfs; 813 814 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 815 if (err) 816 goto out_fail_notifier; 817 818 err = nl80211_init(); 819 if (err) 820 goto out_fail_nl80211; 821 822 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 823 824 err = regulatory_init(); 825 if (err) 826 goto out_fail_reg; 827 828 return 0; 829 830 out_fail_reg: 831 debugfs_remove(ieee80211_debugfs_dir); 832 out_fail_nl80211: 833 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 834 out_fail_notifier: 835 wiphy_sysfs_exit(); 836 out_fail_sysfs: 837 unregister_pernet_device(&cfg80211_pernet_ops); 838 out_fail_pernet: 839 return err; 840 } 841 subsys_initcall(cfg80211_init); 842 843 static void cfg80211_exit(void) 844 { 845 debugfs_remove(ieee80211_debugfs_dir); 846 nl80211_exit(); 847 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 848 wiphy_sysfs_exit(); 849 regulatory_exit(); 850 unregister_pernet_device(&cfg80211_pernet_ops); 851 } 852 module_exit(cfg80211_exit); 853