1 /* 2 * This is the linux wireless configuration interface. 3 * 4 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net> 5 */ 6 7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 8 9 #include <linux/if.h> 10 #include <linux/module.h> 11 #include <linux/err.h> 12 #include <linux/list.h> 13 #include <linux/slab.h> 14 #include <linux/nl80211.h> 15 #include <linux/debugfs.h> 16 #include <linux/notifier.h> 17 #include <linux/device.h> 18 #include <linux/etherdevice.h> 19 #include <linux/rtnetlink.h> 20 #include <linux/sched.h> 21 #include <net/genetlink.h> 22 #include <net/cfg80211.h> 23 #include "nl80211.h" 24 #include "core.h" 25 #include "sysfs.h" 26 #include "debugfs.h" 27 #include "wext-compat.h" 28 #include "ethtool.h" 29 30 /* name for sysfs, %d is appended */ 31 #define PHY_NAME "phy" 32 33 MODULE_AUTHOR("Johannes Berg"); 34 MODULE_LICENSE("GPL"); 35 MODULE_DESCRIPTION("wireless configuration support"); 36 37 /* RCU-protected (and cfg80211_mutex for writers) */ 38 LIST_HEAD(cfg80211_rdev_list); 39 int cfg80211_rdev_list_generation; 40 41 DEFINE_MUTEX(cfg80211_mutex); 42 43 /* for debugfs */ 44 static struct dentry *ieee80211_debugfs_dir; 45 46 /* for the cleanup, scan and event works */ 47 struct workqueue_struct *cfg80211_wq; 48 49 static bool cfg80211_disable_40mhz_24ghz; 50 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644); 51 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz, 52 "Disable 40MHz support in the 2.4GHz band"); 53 54 /* requires cfg80211_mutex to be held! */ 55 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx) 56 { 57 struct cfg80211_registered_device *result = NULL, *rdev; 58 59 if (!wiphy_idx_valid(wiphy_idx)) 60 return NULL; 61 62 assert_cfg80211_lock(); 63 64 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 65 if (rdev->wiphy_idx == wiphy_idx) { 66 result = rdev; 67 break; 68 } 69 } 70 71 return result; 72 } 73 74 int get_wiphy_idx(struct wiphy *wiphy) 75 { 76 struct cfg80211_registered_device *rdev; 77 if (!wiphy) 78 return WIPHY_IDX_STALE; 79 rdev = wiphy_to_dev(wiphy); 80 return rdev->wiphy_idx; 81 } 82 83 /* requires cfg80211_rdev_mutex to be held! */ 84 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx) 85 { 86 struct cfg80211_registered_device *rdev; 87 88 if (!wiphy_idx_valid(wiphy_idx)) 89 return NULL; 90 91 assert_cfg80211_lock(); 92 93 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx); 94 if (!rdev) 95 return NULL; 96 return &rdev->wiphy; 97 } 98 99 struct cfg80211_registered_device * 100 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) 101 { 102 struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV); 103 struct net_device *dev; 104 105 mutex_lock(&cfg80211_mutex); 106 dev = dev_get_by_index(net, ifindex); 107 if (!dev) 108 goto out; 109 if (dev->ieee80211_ptr) { 110 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy); 111 mutex_lock(&rdev->mtx); 112 } else 113 rdev = ERR_PTR(-ENODEV); 114 dev_put(dev); 115 out: 116 mutex_unlock(&cfg80211_mutex); 117 return rdev; 118 } 119 120 /* requires cfg80211_mutex to be held */ 121 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, 122 char *newname) 123 { 124 struct cfg80211_registered_device *rdev2; 125 int wiphy_idx, taken = -1, result, digits; 126 127 assert_cfg80211_lock(); 128 129 /* prohibit calling the thing phy%d when %d is not its number */ 130 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken); 131 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) { 132 /* count number of places needed to print wiphy_idx */ 133 digits = 1; 134 while (wiphy_idx /= 10) 135 digits++; 136 /* 137 * deny the name if it is phy<idx> where <idx> is printed 138 * without leading zeroes. taken == strlen(newname) here 139 */ 140 if (taken == strlen(PHY_NAME) + digits) 141 return -EINVAL; 142 } 143 144 145 /* Ignore nop renames */ 146 if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0) 147 return 0; 148 149 /* Ensure another device does not already have this name. */ 150 list_for_each_entry(rdev2, &cfg80211_rdev_list, list) 151 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0) 152 return -EINVAL; 153 154 result = device_rename(&rdev->wiphy.dev, newname); 155 if (result) 156 return result; 157 158 if (rdev->wiphy.debugfsdir && 159 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent, 160 rdev->wiphy.debugfsdir, 161 rdev->wiphy.debugfsdir->d_parent, 162 newname)) 163 pr_err("failed to rename debugfs dir to %s!\n", newname); 164 165 nl80211_notify_dev_rename(rdev); 166 167 return 0; 168 } 169 170 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, 171 struct net *net) 172 { 173 struct wireless_dev *wdev; 174 int err = 0; 175 176 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK)) 177 return -EOPNOTSUPP; 178 179 list_for_each_entry(wdev, &rdev->wdev_list, list) { 180 if (!wdev->netdev) 181 continue; 182 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 183 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); 184 if (err) 185 break; 186 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 187 } 188 189 if (err) { 190 /* failed -- clean up to old netns */ 191 net = wiphy_net(&rdev->wiphy); 192 193 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list, 194 list) { 195 if (!wdev->netdev) 196 continue; 197 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 198 err = dev_change_net_namespace(wdev->netdev, net, 199 "wlan%d"); 200 WARN_ON(err); 201 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 202 } 203 204 return err; 205 } 206 207 wiphy_net_set(&rdev->wiphy, net); 208 209 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev)); 210 WARN_ON(err); 211 212 return 0; 213 } 214 215 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data) 216 { 217 struct cfg80211_registered_device *rdev = data; 218 219 rdev->ops->rfkill_poll(&rdev->wiphy); 220 } 221 222 static int cfg80211_rfkill_set_block(void *data, bool blocked) 223 { 224 struct cfg80211_registered_device *rdev = data; 225 struct wireless_dev *wdev; 226 227 if (!blocked) 228 return 0; 229 230 rtnl_lock(); 231 mutex_lock(&rdev->devlist_mtx); 232 233 list_for_each_entry(wdev, &rdev->wdev_list, list) 234 if (wdev->netdev) 235 dev_close(wdev->netdev); 236 237 mutex_unlock(&rdev->devlist_mtx); 238 rtnl_unlock(); 239 240 return 0; 241 } 242 243 static void cfg80211_rfkill_sync_work(struct work_struct *work) 244 { 245 struct cfg80211_registered_device *rdev; 246 247 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync); 248 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill)); 249 } 250 251 static void cfg80211_event_work(struct work_struct *work) 252 { 253 struct cfg80211_registered_device *rdev; 254 255 rdev = container_of(work, struct cfg80211_registered_device, 256 event_work); 257 258 rtnl_lock(); 259 cfg80211_lock_rdev(rdev); 260 261 cfg80211_process_rdev_events(rdev); 262 cfg80211_unlock_rdev(rdev); 263 rtnl_unlock(); 264 } 265 266 /* exported functions */ 267 268 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv) 269 { 270 static int wiphy_counter; 271 272 struct cfg80211_registered_device *rdev; 273 int alloc_size; 274 275 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 276 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 277 WARN_ON(ops->connect && !ops->disconnect); 278 WARN_ON(ops->join_ibss && !ops->leave_ibss); 279 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 280 WARN_ON(ops->add_station && !ops->del_station); 281 WARN_ON(ops->add_mpath && !ops->del_mpath); 282 WARN_ON(ops->join_mesh && !ops->leave_mesh); 283 284 alloc_size = sizeof(*rdev) + sizeof_priv; 285 286 rdev = kzalloc(alloc_size, GFP_KERNEL); 287 if (!rdev) 288 return NULL; 289 290 rdev->ops = ops; 291 292 mutex_lock(&cfg80211_mutex); 293 294 rdev->wiphy_idx = wiphy_counter++; 295 296 if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) { 297 wiphy_counter--; 298 mutex_unlock(&cfg80211_mutex); 299 /* ugh, wrapped! */ 300 kfree(rdev); 301 return NULL; 302 } 303 304 mutex_unlock(&cfg80211_mutex); 305 306 /* give it a proper name */ 307 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 308 309 mutex_init(&rdev->mtx); 310 mutex_init(&rdev->devlist_mtx); 311 mutex_init(&rdev->sched_scan_mtx); 312 INIT_LIST_HEAD(&rdev->wdev_list); 313 spin_lock_init(&rdev->bss_lock); 314 INIT_LIST_HEAD(&rdev->bss_list); 315 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 316 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results); 317 #ifdef CONFIG_CFG80211_WEXT 318 rdev->wiphy.wext = &cfg80211_wext_handler; 319 #endif 320 321 device_initialize(&rdev->wiphy.dev); 322 rdev->wiphy.dev.class = &ieee80211_class; 323 rdev->wiphy.dev.platform_data = rdev; 324 325 #ifdef CONFIG_CFG80211_DEFAULT_PS 326 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 327 #endif 328 329 wiphy_net_set(&rdev->wiphy, &init_net); 330 331 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 332 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 333 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 334 &rdev->rfkill_ops, rdev); 335 336 if (!rdev->rfkill) { 337 kfree(rdev); 338 return NULL; 339 } 340 341 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); 342 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 343 INIT_WORK(&rdev->event_work, cfg80211_event_work); 344 345 init_waitqueue_head(&rdev->dev_wait); 346 347 /* 348 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 349 * Fragmentation and RTS threshold are disabled by default with the 350 * special -1 value. 351 */ 352 rdev->wiphy.retry_short = 7; 353 rdev->wiphy.retry_long = 4; 354 rdev->wiphy.frag_threshold = (u32) -1; 355 rdev->wiphy.rts_threshold = (u32) -1; 356 rdev->wiphy.coverage_class = 0; 357 358 return &rdev->wiphy; 359 } 360 EXPORT_SYMBOL(wiphy_new); 361 362 static int wiphy_verify_combinations(struct wiphy *wiphy) 363 { 364 const struct ieee80211_iface_combination *c; 365 int i, j; 366 367 for (i = 0; i < wiphy->n_iface_combinations; i++) { 368 u32 cnt = 0; 369 u16 all_iftypes = 0; 370 371 c = &wiphy->iface_combinations[i]; 372 373 /* Combinations with just one interface aren't real */ 374 if (WARN_ON(c->max_interfaces < 2)) 375 return -EINVAL; 376 377 /* Need at least one channel */ 378 if (WARN_ON(!c->num_different_channels)) 379 return -EINVAL; 380 381 /* 382 * Put a sane limit on maximum number of different 383 * channels to simplify channel accounting code. 384 */ 385 if (WARN_ON(c->num_different_channels > 386 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 387 return -EINVAL; 388 389 if (WARN_ON(!c->n_limits)) 390 return -EINVAL; 391 392 for (j = 0; j < c->n_limits; j++) { 393 u16 types = c->limits[j].types; 394 395 /* 396 * interface types shouldn't overlap, this is 397 * used in cfg80211_can_change_interface() 398 */ 399 if (WARN_ON(types & all_iftypes)) 400 return -EINVAL; 401 all_iftypes |= types; 402 403 if (WARN_ON(!c->limits[j].max)) 404 return -EINVAL; 405 406 /* Shouldn't list software iftypes in combinations! */ 407 if (WARN_ON(wiphy->software_iftypes & types)) 408 return -EINVAL; 409 410 cnt += c->limits[j].max; 411 /* 412 * Don't advertise an unsupported type 413 * in a combination. 414 */ 415 if (WARN_ON((wiphy->interface_modes & types) != types)) 416 return -EINVAL; 417 } 418 419 /* You can't even choose that many! */ 420 if (WARN_ON(cnt < c->max_interfaces)) 421 return -EINVAL; 422 } 423 424 return 0; 425 } 426 427 int wiphy_register(struct wiphy *wiphy) 428 { 429 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 430 int res; 431 enum ieee80211_band band; 432 struct ieee80211_supported_band *sband; 433 bool have_band = false; 434 int i; 435 u16 ifmodes = wiphy->interface_modes; 436 437 #ifdef CONFIG_PM 438 if (WARN_ON((wiphy->wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 439 !(wiphy->wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 440 return -EINVAL; 441 #endif 442 443 if (WARN_ON(wiphy->ap_sme_capa && 444 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 445 return -EINVAL; 446 447 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 448 return -EINVAL; 449 450 if (WARN_ON(wiphy->addresses && 451 !is_zero_ether_addr(wiphy->perm_addr) && 452 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 453 ETH_ALEN))) 454 return -EINVAL; 455 456 if (wiphy->addresses) 457 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 458 459 /* sanity check ifmodes */ 460 WARN_ON(!ifmodes); 461 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 462 if (WARN_ON(ifmodes != wiphy->interface_modes)) 463 wiphy->interface_modes = ifmodes; 464 465 res = wiphy_verify_combinations(wiphy); 466 if (res) 467 return res; 468 469 /* sanity check supported bands/channels */ 470 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 471 sband = wiphy->bands[band]; 472 if (!sband) 473 continue; 474 475 sband->band = band; 476 if (WARN_ON(!sband->n_channels)) 477 return -EINVAL; 478 /* 479 * on 60gHz band, there are no legacy rates, so 480 * n_bitrates is 0 481 */ 482 if (WARN_ON(band != IEEE80211_BAND_60GHZ && 483 !sband->n_bitrates)) 484 return -EINVAL; 485 486 /* 487 * Since cfg80211_disable_40mhz_24ghz is global, we can 488 * modify the sband's ht data even if the driver uses a 489 * global structure for that. 490 */ 491 if (cfg80211_disable_40mhz_24ghz && 492 band == IEEE80211_BAND_2GHZ && 493 sband->ht_cap.ht_supported) { 494 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 495 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 496 } 497 498 /* 499 * Since we use a u32 for rate bitmaps in 500 * ieee80211_get_response_rate, we cannot 501 * have more than 32 legacy rates. 502 */ 503 if (WARN_ON(sband->n_bitrates > 32)) 504 return -EINVAL; 505 506 for (i = 0; i < sband->n_channels; i++) { 507 sband->channels[i].orig_flags = 508 sband->channels[i].flags; 509 sband->channels[i].orig_mag = 510 sband->channels[i].max_antenna_gain; 511 sband->channels[i].orig_mpwr = 512 sband->channels[i].max_power; 513 sband->channels[i].band = band; 514 } 515 516 have_band = true; 517 } 518 519 if (!have_band) { 520 WARN_ON(1); 521 return -EINVAL; 522 } 523 524 #ifdef CONFIG_PM 525 if (rdev->wiphy.wowlan.n_patterns) { 526 if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len || 527 rdev->wiphy.wowlan.pattern_min_len > 528 rdev->wiphy.wowlan.pattern_max_len)) 529 return -EINVAL; 530 } 531 #endif 532 533 /* check and set up bitrates */ 534 ieee80211_set_bitrate_flags(wiphy); 535 536 mutex_lock(&cfg80211_mutex); 537 538 res = device_add(&rdev->wiphy.dev); 539 if (res) { 540 mutex_unlock(&cfg80211_mutex); 541 return res; 542 } 543 544 /* set up regulatory info */ 545 wiphy_regulatory_register(wiphy); 546 547 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 548 cfg80211_rdev_list_generation++; 549 550 /* add to debugfs */ 551 rdev->wiphy.debugfsdir = 552 debugfs_create_dir(wiphy_name(&rdev->wiphy), 553 ieee80211_debugfs_dir); 554 if (IS_ERR(rdev->wiphy.debugfsdir)) 555 rdev->wiphy.debugfsdir = NULL; 556 557 if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { 558 struct regulatory_request request; 559 560 request.wiphy_idx = get_wiphy_idx(wiphy); 561 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 562 request.alpha2[0] = '9'; 563 request.alpha2[1] = '9'; 564 565 nl80211_send_reg_change_event(&request); 566 } 567 568 cfg80211_debugfs_rdev_add(rdev); 569 mutex_unlock(&cfg80211_mutex); 570 571 /* 572 * due to a locking dependency this has to be outside of the 573 * cfg80211_mutex lock 574 */ 575 res = rfkill_register(rdev->rfkill); 576 if (res) 577 goto out_rm_dev; 578 579 rtnl_lock(); 580 rdev->wiphy.registered = true; 581 rtnl_unlock(); 582 return 0; 583 584 out_rm_dev: 585 device_del(&rdev->wiphy.dev); 586 return res; 587 } 588 EXPORT_SYMBOL(wiphy_register); 589 590 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 591 { 592 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 593 594 if (!rdev->ops->rfkill_poll) 595 return; 596 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 597 rfkill_resume_polling(rdev->rfkill); 598 } 599 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 600 601 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 602 { 603 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 604 605 rfkill_pause_polling(rdev->rfkill); 606 } 607 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 608 609 void wiphy_unregister(struct wiphy *wiphy) 610 { 611 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 612 613 rtnl_lock(); 614 rdev->wiphy.registered = false; 615 rtnl_unlock(); 616 617 rfkill_unregister(rdev->rfkill); 618 619 /* protect the device list */ 620 mutex_lock(&cfg80211_mutex); 621 622 wait_event(rdev->dev_wait, ({ 623 int __count; 624 mutex_lock(&rdev->devlist_mtx); 625 __count = rdev->opencount; 626 mutex_unlock(&rdev->devlist_mtx); 627 __count == 0; })); 628 629 mutex_lock(&rdev->devlist_mtx); 630 BUG_ON(!list_empty(&rdev->wdev_list)); 631 mutex_unlock(&rdev->devlist_mtx); 632 633 /* 634 * First remove the hardware from everywhere, this makes 635 * it impossible to find from userspace. 636 */ 637 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 638 list_del_rcu(&rdev->list); 639 synchronize_rcu(); 640 641 /* 642 * Try to grab rdev->mtx. If a command is still in progress, 643 * hopefully the driver will refuse it since it's tearing 644 * down the device already. We wait for this command to complete 645 * before unlinking the item from the list. 646 * Note: as codified by the BUG_ON above we cannot get here if 647 * a virtual interface is still present. Hence, we can only get 648 * to lock contention here if userspace issues a command that 649 * identified the hardware by wiphy index. 650 */ 651 cfg80211_lock_rdev(rdev); 652 /* nothing */ 653 cfg80211_unlock_rdev(rdev); 654 655 /* 656 * If this device got a regulatory hint tell core its 657 * free to listen now to a new shiny device regulatory hint 658 */ 659 wiphy_regulatory_deregister(wiphy); 660 661 cfg80211_rdev_list_generation++; 662 device_del(&rdev->wiphy.dev); 663 664 mutex_unlock(&cfg80211_mutex); 665 666 flush_work(&rdev->scan_done_wk); 667 cancel_work_sync(&rdev->conn_work); 668 flush_work(&rdev->event_work); 669 670 if (rdev->wowlan && rdev->ops->set_wakeup) 671 rdev->ops->set_wakeup(&rdev->wiphy, false); 672 cfg80211_rdev_free_wowlan(rdev); 673 } 674 EXPORT_SYMBOL(wiphy_unregister); 675 676 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 677 { 678 struct cfg80211_internal_bss *scan, *tmp; 679 rfkill_destroy(rdev->rfkill); 680 mutex_destroy(&rdev->mtx); 681 mutex_destroy(&rdev->devlist_mtx); 682 mutex_destroy(&rdev->sched_scan_mtx); 683 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 684 cfg80211_put_bss(&scan->pub); 685 kfree(rdev); 686 } 687 688 void wiphy_free(struct wiphy *wiphy) 689 { 690 put_device(&wiphy->dev); 691 } 692 EXPORT_SYMBOL(wiphy_free); 693 694 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 695 { 696 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 697 698 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 699 schedule_work(&rdev->rfkill_sync); 700 } 701 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 702 703 static void wdev_cleanup_work(struct work_struct *work) 704 { 705 struct wireless_dev *wdev; 706 struct cfg80211_registered_device *rdev; 707 708 wdev = container_of(work, struct wireless_dev, cleanup_work); 709 rdev = wiphy_to_dev(wdev->wiphy); 710 711 cfg80211_lock_rdev(rdev); 712 713 if (WARN_ON(rdev->scan_req && rdev->scan_req->wdev == wdev)) { 714 rdev->scan_req->aborted = true; 715 ___cfg80211_scan_done(rdev, true); 716 } 717 718 cfg80211_unlock_rdev(rdev); 719 720 mutex_lock(&rdev->sched_scan_mtx); 721 722 if (WARN_ON(rdev->sched_scan_req && 723 rdev->sched_scan_req->dev == wdev->netdev)) { 724 __cfg80211_stop_sched_scan(rdev, false); 725 } 726 727 mutex_unlock(&rdev->sched_scan_mtx); 728 729 mutex_lock(&rdev->devlist_mtx); 730 rdev->opencount--; 731 mutex_unlock(&rdev->devlist_mtx); 732 wake_up(&rdev->dev_wait); 733 734 dev_put(wdev->netdev); 735 } 736 737 static struct device_type wiphy_type = { 738 .name = "wlan", 739 }; 740 741 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 742 enum nl80211_iftype iftype, int num) 743 { 744 ASSERT_RTNL(); 745 746 rdev->num_running_ifaces += num; 747 if (iftype == NL80211_IFTYPE_MONITOR) 748 rdev->num_running_monitor_ifaces += num; 749 } 750 751 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 752 unsigned long state, 753 void *ndev) 754 { 755 struct net_device *dev = ndev; 756 struct wireless_dev *wdev = dev->ieee80211_ptr; 757 struct cfg80211_registered_device *rdev; 758 int ret; 759 760 if (!wdev) 761 return NOTIFY_DONE; 762 763 rdev = wiphy_to_dev(wdev->wiphy); 764 765 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 766 767 switch (state) { 768 case NETDEV_POST_INIT: 769 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 770 break; 771 case NETDEV_REGISTER: 772 /* 773 * NB: cannot take rdev->mtx here because this may be 774 * called within code protected by it when interfaces 775 * are added with nl80211. 776 */ 777 mutex_init(&wdev->mtx); 778 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work); 779 INIT_LIST_HEAD(&wdev->event_list); 780 spin_lock_init(&wdev->event_lock); 781 INIT_LIST_HEAD(&wdev->mgmt_registrations); 782 spin_lock_init(&wdev->mgmt_registrations_lock); 783 784 mutex_lock(&rdev->devlist_mtx); 785 wdev->identifier = ++rdev->wdev_id; 786 list_add_rcu(&wdev->list, &rdev->wdev_list); 787 rdev->devlist_generation++; 788 /* can only change netns with wiphy */ 789 dev->features |= NETIF_F_NETNS_LOCAL; 790 791 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 792 "phy80211")) { 793 pr_err("failed to add phy80211 symlink to netdev!\n"); 794 } 795 wdev->netdev = dev; 796 wdev->sme_state = CFG80211_SME_IDLE; 797 mutex_unlock(&rdev->devlist_mtx); 798 #ifdef CONFIG_CFG80211_WEXT 799 wdev->wext.default_key = -1; 800 wdev->wext.default_mgmt_key = -1; 801 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 802 #endif 803 804 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 805 wdev->ps = true; 806 else 807 wdev->ps = false; 808 /* allow mac80211 to determine the timeout */ 809 wdev->ps_timeout = -1; 810 811 if (!dev->ethtool_ops) 812 dev->ethtool_ops = &cfg80211_ethtool_ops; 813 814 if ((wdev->iftype == NL80211_IFTYPE_STATION || 815 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 816 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 817 dev->priv_flags |= IFF_DONT_BRIDGE; 818 break; 819 case NETDEV_GOING_DOWN: 820 switch (wdev->iftype) { 821 case NL80211_IFTYPE_ADHOC: 822 cfg80211_leave_ibss(rdev, dev, true); 823 break; 824 case NL80211_IFTYPE_P2P_CLIENT: 825 case NL80211_IFTYPE_STATION: 826 mutex_lock(&rdev->sched_scan_mtx); 827 __cfg80211_stop_sched_scan(rdev, false); 828 mutex_unlock(&rdev->sched_scan_mtx); 829 830 wdev_lock(wdev); 831 #ifdef CONFIG_CFG80211_WEXT 832 kfree(wdev->wext.ie); 833 wdev->wext.ie = NULL; 834 wdev->wext.ie_len = 0; 835 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 836 #endif 837 __cfg80211_disconnect(rdev, dev, 838 WLAN_REASON_DEAUTH_LEAVING, true); 839 cfg80211_mlme_down(rdev, dev); 840 wdev_unlock(wdev); 841 break; 842 case NL80211_IFTYPE_MESH_POINT: 843 cfg80211_leave_mesh(rdev, dev); 844 break; 845 case NL80211_IFTYPE_AP: 846 cfg80211_stop_ap(rdev, dev); 847 break; 848 default: 849 break; 850 } 851 wdev->beacon_interval = 0; 852 break; 853 case NETDEV_DOWN: 854 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 855 dev_hold(dev); 856 queue_work(cfg80211_wq, &wdev->cleanup_work); 857 break; 858 case NETDEV_UP: 859 /* 860 * If we have a really quick DOWN/UP succession we may 861 * have this work still pending ... cancel it and see 862 * if it was pending, in which case we need to account 863 * for some of the work it would have done. 864 */ 865 if (cancel_work_sync(&wdev->cleanup_work)) { 866 mutex_lock(&rdev->devlist_mtx); 867 rdev->opencount--; 868 mutex_unlock(&rdev->devlist_mtx); 869 dev_put(dev); 870 } 871 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 872 cfg80211_lock_rdev(rdev); 873 mutex_lock(&rdev->devlist_mtx); 874 wdev_lock(wdev); 875 switch (wdev->iftype) { 876 #ifdef CONFIG_CFG80211_WEXT 877 case NL80211_IFTYPE_ADHOC: 878 cfg80211_ibss_wext_join(rdev, wdev); 879 break; 880 case NL80211_IFTYPE_STATION: 881 cfg80211_mgd_wext_connect(rdev, wdev); 882 break; 883 #endif 884 #ifdef CONFIG_MAC80211_MESH 885 case NL80211_IFTYPE_MESH_POINT: 886 { 887 /* backward compat code... */ 888 struct mesh_setup setup; 889 memcpy(&setup, &default_mesh_setup, 890 sizeof(setup)); 891 /* back compat only needed for mesh_id */ 892 setup.mesh_id = wdev->ssid; 893 setup.mesh_id_len = wdev->mesh_id_up_len; 894 if (wdev->mesh_id_up_len) 895 __cfg80211_join_mesh(rdev, dev, 896 &setup, 897 &default_mesh_config); 898 break; 899 } 900 #endif 901 default: 902 break; 903 } 904 wdev_unlock(wdev); 905 rdev->opencount++; 906 mutex_unlock(&rdev->devlist_mtx); 907 cfg80211_unlock_rdev(rdev); 908 909 /* 910 * Configure power management to the driver here so that its 911 * correctly set also after interface type changes etc. 912 */ 913 if ((wdev->iftype == NL80211_IFTYPE_STATION || 914 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 915 rdev->ops->set_power_mgmt) 916 if (rdev->ops->set_power_mgmt(wdev->wiphy, dev, 917 wdev->ps, 918 wdev->ps_timeout)) { 919 /* assume this means it's off */ 920 wdev->ps = false; 921 } 922 break; 923 case NETDEV_UNREGISTER: 924 /* 925 * NB: cannot take rdev->mtx here because this may be 926 * called within code protected by it when interfaces 927 * are removed with nl80211. 928 */ 929 mutex_lock(&rdev->devlist_mtx); 930 /* 931 * It is possible to get NETDEV_UNREGISTER 932 * multiple times. To detect that, check 933 * that the interface is still on the list 934 * of registered interfaces, and only then 935 * remove and clean it up. 936 */ 937 if (!list_empty(&wdev->list)) { 938 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 939 list_del_rcu(&wdev->list); 940 rdev->devlist_generation++; 941 cfg80211_mlme_purge_registrations(wdev); 942 #ifdef CONFIG_CFG80211_WEXT 943 kfree(wdev->wext.keys); 944 #endif 945 } 946 mutex_unlock(&rdev->devlist_mtx); 947 /* 948 * synchronise (so that we won't find this netdev 949 * from other code any more) and then clear the list 950 * head so that the above code can safely check for 951 * !list_empty() to avoid double-cleanup. 952 */ 953 synchronize_rcu(); 954 INIT_LIST_HEAD(&wdev->list); 955 /* 956 * Ensure that all events have been processed and 957 * freed. 958 */ 959 cfg80211_process_wdev_events(wdev); 960 break; 961 case NETDEV_PRE_UP: 962 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 963 return notifier_from_errno(-EOPNOTSUPP); 964 if (rfkill_blocked(rdev->rfkill)) 965 return notifier_from_errno(-ERFKILL); 966 mutex_lock(&rdev->devlist_mtx); 967 ret = cfg80211_can_add_interface(rdev, wdev->iftype); 968 mutex_unlock(&rdev->devlist_mtx); 969 if (ret) 970 return notifier_from_errno(ret); 971 break; 972 } 973 974 return NOTIFY_DONE; 975 } 976 977 static struct notifier_block cfg80211_netdev_notifier = { 978 .notifier_call = cfg80211_netdev_notifier_call, 979 }; 980 981 static void __net_exit cfg80211_pernet_exit(struct net *net) 982 { 983 struct cfg80211_registered_device *rdev; 984 985 rtnl_lock(); 986 mutex_lock(&cfg80211_mutex); 987 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 988 if (net_eq(wiphy_net(&rdev->wiphy), net)) 989 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 990 } 991 mutex_unlock(&cfg80211_mutex); 992 rtnl_unlock(); 993 } 994 995 static struct pernet_operations cfg80211_pernet_ops = { 996 .exit = cfg80211_pernet_exit, 997 }; 998 999 static int __init cfg80211_init(void) 1000 { 1001 int err; 1002 1003 err = register_pernet_device(&cfg80211_pernet_ops); 1004 if (err) 1005 goto out_fail_pernet; 1006 1007 err = wiphy_sysfs_init(); 1008 if (err) 1009 goto out_fail_sysfs; 1010 1011 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1012 if (err) 1013 goto out_fail_notifier; 1014 1015 err = nl80211_init(); 1016 if (err) 1017 goto out_fail_nl80211; 1018 1019 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1020 1021 err = regulatory_init(); 1022 if (err) 1023 goto out_fail_reg; 1024 1025 cfg80211_wq = create_singlethread_workqueue("cfg80211"); 1026 if (!cfg80211_wq) 1027 goto out_fail_wq; 1028 1029 return 0; 1030 1031 out_fail_wq: 1032 regulatory_exit(); 1033 out_fail_reg: 1034 debugfs_remove(ieee80211_debugfs_dir); 1035 out_fail_nl80211: 1036 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1037 out_fail_notifier: 1038 wiphy_sysfs_exit(); 1039 out_fail_sysfs: 1040 unregister_pernet_device(&cfg80211_pernet_ops); 1041 out_fail_pernet: 1042 return err; 1043 } 1044 subsys_initcall(cfg80211_init); 1045 1046 static void __exit cfg80211_exit(void) 1047 { 1048 debugfs_remove(ieee80211_debugfs_dir); 1049 nl80211_exit(); 1050 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1051 wiphy_sysfs_exit(); 1052 regulatory_exit(); 1053 unregister_pernet_device(&cfg80211_pernet_ops); 1054 destroy_workqueue(cfg80211_wq); 1055 } 1056 module_exit(cfg80211_exit); 1057