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 #include "rdev-ops.h" 30 31 /* name for sysfs, %d is appended */ 32 #define PHY_NAME "phy" 33 34 MODULE_AUTHOR("Johannes Berg"); 35 MODULE_LICENSE("GPL"); 36 MODULE_DESCRIPTION("wireless configuration support"); 37 38 /* RCU-protected (and cfg80211_mutex for writers) */ 39 LIST_HEAD(cfg80211_rdev_list); 40 int cfg80211_rdev_list_generation; 41 42 DEFINE_MUTEX(cfg80211_mutex); 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 /* requires cfg80211_mutex to be held! */ 56 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx) 57 { 58 struct cfg80211_registered_device *result = NULL, *rdev; 59 60 if (!wiphy_idx_valid(wiphy_idx)) 61 return NULL; 62 63 assert_cfg80211_lock(); 64 65 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 66 if (rdev->wiphy_idx == wiphy_idx) { 67 result = rdev; 68 break; 69 } 70 } 71 72 return result; 73 } 74 75 int get_wiphy_idx(struct wiphy *wiphy) 76 { 77 struct cfg80211_registered_device *rdev; 78 if (!wiphy) 79 return WIPHY_IDX_STALE; 80 rdev = wiphy_to_dev(wiphy); 81 return rdev->wiphy_idx; 82 } 83 84 /* requires cfg80211_rdev_mutex to be held! */ 85 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx) 86 { 87 struct cfg80211_registered_device *rdev; 88 89 if (!wiphy_idx_valid(wiphy_idx)) 90 return NULL; 91 92 assert_cfg80211_lock(); 93 94 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx); 95 if (!rdev) 96 return NULL; 97 return &rdev->wiphy; 98 } 99 100 struct cfg80211_registered_device * 101 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) 102 { 103 struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV); 104 struct net_device *dev; 105 106 mutex_lock(&cfg80211_mutex); 107 dev = dev_get_by_index(net, ifindex); 108 if (!dev) 109 goto out; 110 if (dev->ieee80211_ptr) { 111 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy); 112 mutex_lock(&rdev->mtx); 113 } else 114 rdev = ERR_PTR(-ENODEV); 115 dev_put(dev); 116 out: 117 mutex_unlock(&cfg80211_mutex); 118 return rdev; 119 } 120 121 /* requires cfg80211_mutex to be held */ 122 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, 123 char *newname) 124 { 125 struct cfg80211_registered_device *rdev2; 126 int wiphy_idx, taken = -1, result, digits; 127 128 assert_cfg80211_lock(); 129 130 /* prohibit calling the thing phy%d when %d is not its number */ 131 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken); 132 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) { 133 /* count number of places needed to print wiphy_idx */ 134 digits = 1; 135 while (wiphy_idx /= 10) 136 digits++; 137 /* 138 * deny the name if it is phy<idx> where <idx> is printed 139 * without leading zeroes. taken == strlen(newname) here 140 */ 141 if (taken == strlen(PHY_NAME) + digits) 142 return -EINVAL; 143 } 144 145 146 /* Ignore nop renames */ 147 if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0) 148 return 0; 149 150 /* Ensure another device does not already have this name. */ 151 list_for_each_entry(rdev2, &cfg80211_rdev_list, list) 152 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0) 153 return -EINVAL; 154 155 result = device_rename(&rdev->wiphy.dev, newname); 156 if (result) 157 return result; 158 159 if (rdev->wiphy.debugfsdir && 160 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent, 161 rdev->wiphy.debugfsdir, 162 rdev->wiphy.debugfsdir->d_parent, 163 newname)) 164 pr_err("failed to rename debugfs dir to %s!\n", newname); 165 166 nl80211_notify_dev_rename(rdev); 167 168 return 0; 169 } 170 171 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, 172 struct net *net) 173 { 174 struct wireless_dev *wdev; 175 int err = 0; 176 177 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK)) 178 return -EOPNOTSUPP; 179 180 list_for_each_entry(wdev, &rdev->wdev_list, list) { 181 if (!wdev->netdev) 182 continue; 183 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 184 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); 185 if (err) 186 break; 187 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 188 } 189 190 if (err) { 191 /* failed -- clean up to old netns */ 192 net = wiphy_net(&rdev->wiphy); 193 194 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list, 195 list) { 196 if (!wdev->netdev) 197 continue; 198 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 199 err = dev_change_net_namespace(wdev->netdev, net, 200 "wlan%d"); 201 WARN_ON(err); 202 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 203 } 204 205 return err; 206 } 207 208 wiphy_net_set(&rdev->wiphy, net); 209 210 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev)); 211 WARN_ON(err); 212 213 return 0; 214 } 215 216 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data) 217 { 218 struct cfg80211_registered_device *rdev = data; 219 220 rdev_rfkill_poll(rdev); 221 } 222 223 static int cfg80211_rfkill_set_block(void *data, bool blocked) 224 { 225 struct cfg80211_registered_device *rdev = data; 226 struct wireless_dev *wdev; 227 228 if (!blocked) 229 return 0; 230 231 rtnl_lock(); 232 mutex_lock(&rdev->devlist_mtx); 233 234 list_for_each_entry(wdev, &rdev->wdev_list, list) { 235 if (wdev->netdev) { 236 dev_close(wdev->netdev); 237 continue; 238 } 239 /* otherwise, check iftype */ 240 switch (wdev->iftype) { 241 case NL80211_IFTYPE_P2P_DEVICE: 242 if (!wdev->p2p_started) 243 break; 244 rdev_stop_p2p_device(rdev, wdev); 245 wdev->p2p_started = false; 246 rdev->opencount--; 247 break; 248 default: 249 break; 250 } 251 } 252 253 mutex_unlock(&rdev->devlist_mtx); 254 rtnl_unlock(); 255 256 return 0; 257 } 258 259 static void cfg80211_rfkill_sync_work(struct work_struct *work) 260 { 261 struct cfg80211_registered_device *rdev; 262 263 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync); 264 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill)); 265 } 266 267 static void cfg80211_event_work(struct work_struct *work) 268 { 269 struct cfg80211_registered_device *rdev; 270 271 rdev = container_of(work, struct cfg80211_registered_device, 272 event_work); 273 274 rtnl_lock(); 275 cfg80211_lock_rdev(rdev); 276 277 cfg80211_process_rdev_events(rdev); 278 cfg80211_unlock_rdev(rdev); 279 rtnl_unlock(); 280 } 281 282 /* exported functions */ 283 284 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv) 285 { 286 static int wiphy_counter; 287 288 struct cfg80211_registered_device *rdev; 289 int alloc_size; 290 291 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 292 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 293 WARN_ON(ops->connect && !ops->disconnect); 294 WARN_ON(ops->join_ibss && !ops->leave_ibss); 295 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 296 WARN_ON(ops->add_station && !ops->del_station); 297 WARN_ON(ops->add_mpath && !ops->del_mpath); 298 WARN_ON(ops->join_mesh && !ops->leave_mesh); 299 300 alloc_size = sizeof(*rdev) + sizeof_priv; 301 302 rdev = kzalloc(alloc_size, GFP_KERNEL); 303 if (!rdev) 304 return NULL; 305 306 rdev->ops = ops; 307 308 mutex_lock(&cfg80211_mutex); 309 310 rdev->wiphy_idx = wiphy_counter++; 311 312 if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) { 313 wiphy_counter--; 314 mutex_unlock(&cfg80211_mutex); 315 /* ugh, wrapped! */ 316 kfree(rdev); 317 return NULL; 318 } 319 320 mutex_unlock(&cfg80211_mutex); 321 322 /* give it a proper name */ 323 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 324 325 mutex_init(&rdev->mtx); 326 mutex_init(&rdev->devlist_mtx); 327 mutex_init(&rdev->sched_scan_mtx); 328 INIT_LIST_HEAD(&rdev->wdev_list); 329 INIT_LIST_HEAD(&rdev->beacon_registrations); 330 spin_lock_init(&rdev->beacon_registrations_lock); 331 spin_lock_init(&rdev->bss_lock); 332 INIT_LIST_HEAD(&rdev->bss_list); 333 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 334 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results); 335 #ifdef CONFIG_CFG80211_WEXT 336 rdev->wiphy.wext = &cfg80211_wext_handler; 337 #endif 338 339 device_initialize(&rdev->wiphy.dev); 340 rdev->wiphy.dev.class = &ieee80211_class; 341 rdev->wiphy.dev.platform_data = rdev; 342 343 #ifdef CONFIG_CFG80211_DEFAULT_PS 344 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 345 #endif 346 347 wiphy_net_set(&rdev->wiphy, &init_net); 348 349 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 350 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 351 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 352 &rdev->rfkill_ops, rdev); 353 354 if (!rdev->rfkill) { 355 kfree(rdev); 356 return NULL; 357 } 358 359 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); 360 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 361 INIT_WORK(&rdev->event_work, cfg80211_event_work); 362 363 init_waitqueue_head(&rdev->dev_wait); 364 365 /* 366 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 367 * Fragmentation and RTS threshold are disabled by default with the 368 * special -1 value. 369 */ 370 rdev->wiphy.retry_short = 7; 371 rdev->wiphy.retry_long = 4; 372 rdev->wiphy.frag_threshold = (u32) -1; 373 rdev->wiphy.rts_threshold = (u32) -1; 374 rdev->wiphy.coverage_class = 0; 375 376 rdev->wiphy.features = NL80211_FEATURE_SCAN_FLUSH; 377 378 return &rdev->wiphy; 379 } 380 EXPORT_SYMBOL(wiphy_new); 381 382 static int wiphy_verify_combinations(struct wiphy *wiphy) 383 { 384 const struct ieee80211_iface_combination *c; 385 int i, j; 386 387 for (i = 0; i < wiphy->n_iface_combinations; i++) { 388 u32 cnt = 0; 389 u16 all_iftypes = 0; 390 391 c = &wiphy->iface_combinations[i]; 392 393 /* Combinations with just one interface aren't real */ 394 if (WARN_ON(c->max_interfaces < 2)) 395 return -EINVAL; 396 397 /* Need at least one channel */ 398 if (WARN_ON(!c->num_different_channels)) 399 return -EINVAL; 400 401 /* 402 * Put a sane limit on maximum number of different 403 * channels to simplify channel accounting code. 404 */ 405 if (WARN_ON(c->num_different_channels > 406 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 407 return -EINVAL; 408 409 if (WARN_ON(!c->n_limits)) 410 return -EINVAL; 411 412 for (j = 0; j < c->n_limits; j++) { 413 u16 types = c->limits[j].types; 414 415 /* 416 * interface types shouldn't overlap, this is 417 * used in cfg80211_can_change_interface() 418 */ 419 if (WARN_ON(types & all_iftypes)) 420 return -EINVAL; 421 all_iftypes |= types; 422 423 if (WARN_ON(!c->limits[j].max)) 424 return -EINVAL; 425 426 /* Shouldn't list software iftypes in combinations! */ 427 if (WARN_ON(wiphy->software_iftypes & types)) 428 return -EINVAL; 429 430 /* Only a single P2P_DEVICE can be allowed */ 431 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 432 c->limits[j].max > 1)) 433 return -EINVAL; 434 435 cnt += c->limits[j].max; 436 /* 437 * Don't advertise an unsupported type 438 * in a combination. 439 */ 440 if (WARN_ON((wiphy->interface_modes & types) != types)) 441 return -EINVAL; 442 } 443 444 /* You can't even choose that many! */ 445 if (WARN_ON(cnt < c->max_interfaces)) 446 return -EINVAL; 447 } 448 449 return 0; 450 } 451 452 int wiphy_register(struct wiphy *wiphy) 453 { 454 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 455 int res; 456 enum ieee80211_band band; 457 struct ieee80211_supported_band *sband; 458 bool have_band = false; 459 int i; 460 u16 ifmodes = wiphy->interface_modes; 461 462 #ifdef CONFIG_PM 463 if (WARN_ON((wiphy->wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 464 !(wiphy->wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 465 return -EINVAL; 466 #endif 467 468 if (WARN_ON(wiphy->ap_sme_capa && 469 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 470 return -EINVAL; 471 472 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 473 return -EINVAL; 474 475 if (WARN_ON(wiphy->addresses && 476 !is_zero_ether_addr(wiphy->perm_addr) && 477 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 478 ETH_ALEN))) 479 return -EINVAL; 480 481 if (wiphy->addresses) 482 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 483 484 /* sanity check ifmodes */ 485 WARN_ON(!ifmodes); 486 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 487 if (WARN_ON(ifmodes != wiphy->interface_modes)) 488 wiphy->interface_modes = ifmodes; 489 490 res = wiphy_verify_combinations(wiphy); 491 if (res) 492 return res; 493 494 /* sanity check supported bands/channels */ 495 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 496 sband = wiphy->bands[band]; 497 if (!sband) 498 continue; 499 500 sband->band = band; 501 if (WARN_ON(!sband->n_channels)) 502 return -EINVAL; 503 /* 504 * on 60gHz band, there are no legacy rates, so 505 * n_bitrates is 0 506 */ 507 if (WARN_ON(band != IEEE80211_BAND_60GHZ && 508 !sband->n_bitrates)) 509 return -EINVAL; 510 511 /* 512 * Since cfg80211_disable_40mhz_24ghz is global, we can 513 * modify the sband's ht data even if the driver uses a 514 * global structure for that. 515 */ 516 if (cfg80211_disable_40mhz_24ghz && 517 band == IEEE80211_BAND_2GHZ && 518 sband->ht_cap.ht_supported) { 519 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 520 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 521 } 522 523 /* 524 * Since we use a u32 for rate bitmaps in 525 * ieee80211_get_response_rate, we cannot 526 * have more than 32 legacy rates. 527 */ 528 if (WARN_ON(sband->n_bitrates > 32)) 529 return -EINVAL; 530 531 for (i = 0; i < sband->n_channels; i++) { 532 sband->channels[i].orig_flags = 533 sband->channels[i].flags; 534 sband->channels[i].orig_mag = INT_MAX; 535 sband->channels[i].orig_mpwr = 536 sband->channels[i].max_power; 537 sband->channels[i].band = band; 538 } 539 540 have_band = true; 541 } 542 543 if (!have_band) { 544 WARN_ON(1); 545 return -EINVAL; 546 } 547 548 #ifdef CONFIG_PM 549 if (rdev->wiphy.wowlan.n_patterns) { 550 if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len || 551 rdev->wiphy.wowlan.pattern_min_len > 552 rdev->wiphy.wowlan.pattern_max_len)) 553 return -EINVAL; 554 } 555 #endif 556 557 /* check and set up bitrates */ 558 ieee80211_set_bitrate_flags(wiphy); 559 560 mutex_lock(&cfg80211_mutex); 561 562 res = device_add(&rdev->wiphy.dev); 563 if (res) { 564 mutex_unlock(&cfg80211_mutex); 565 return res; 566 } 567 568 /* set up regulatory info */ 569 wiphy_regulatory_register(wiphy); 570 571 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 572 cfg80211_rdev_list_generation++; 573 574 /* add to debugfs */ 575 rdev->wiphy.debugfsdir = 576 debugfs_create_dir(wiphy_name(&rdev->wiphy), 577 ieee80211_debugfs_dir); 578 if (IS_ERR(rdev->wiphy.debugfsdir)) 579 rdev->wiphy.debugfsdir = NULL; 580 581 if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { 582 struct regulatory_request request; 583 584 request.wiphy_idx = get_wiphy_idx(wiphy); 585 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 586 request.alpha2[0] = '9'; 587 request.alpha2[1] = '9'; 588 589 nl80211_send_reg_change_event(&request); 590 } 591 592 cfg80211_debugfs_rdev_add(rdev); 593 mutex_unlock(&cfg80211_mutex); 594 595 /* 596 * due to a locking dependency this has to be outside of the 597 * cfg80211_mutex lock 598 */ 599 res = rfkill_register(rdev->rfkill); 600 if (res) 601 goto out_rm_dev; 602 603 rtnl_lock(); 604 rdev->wiphy.registered = true; 605 rtnl_unlock(); 606 return 0; 607 608 out_rm_dev: 609 device_del(&rdev->wiphy.dev); 610 return res; 611 } 612 EXPORT_SYMBOL(wiphy_register); 613 614 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 615 { 616 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 617 618 if (!rdev->ops->rfkill_poll) 619 return; 620 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 621 rfkill_resume_polling(rdev->rfkill); 622 } 623 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 624 625 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 626 { 627 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 628 629 rfkill_pause_polling(rdev->rfkill); 630 } 631 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 632 633 void wiphy_unregister(struct wiphy *wiphy) 634 { 635 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 636 637 rtnl_lock(); 638 rdev->wiphy.registered = false; 639 rtnl_unlock(); 640 641 rfkill_unregister(rdev->rfkill); 642 643 /* protect the device list */ 644 mutex_lock(&cfg80211_mutex); 645 646 wait_event(rdev->dev_wait, ({ 647 int __count; 648 mutex_lock(&rdev->devlist_mtx); 649 __count = rdev->opencount; 650 mutex_unlock(&rdev->devlist_mtx); 651 __count == 0; })); 652 653 mutex_lock(&rdev->devlist_mtx); 654 BUG_ON(!list_empty(&rdev->wdev_list)); 655 mutex_unlock(&rdev->devlist_mtx); 656 657 /* 658 * First remove the hardware from everywhere, this makes 659 * it impossible to find from userspace. 660 */ 661 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 662 list_del_rcu(&rdev->list); 663 synchronize_rcu(); 664 665 /* 666 * Try to grab rdev->mtx. If a command is still in progress, 667 * hopefully the driver will refuse it since it's tearing 668 * down the device already. We wait for this command to complete 669 * before unlinking the item from the list. 670 * Note: as codified by the BUG_ON above we cannot get here if 671 * a virtual interface is still present. Hence, we can only get 672 * to lock contention here if userspace issues a command that 673 * identified the hardware by wiphy index. 674 */ 675 cfg80211_lock_rdev(rdev); 676 /* nothing */ 677 cfg80211_unlock_rdev(rdev); 678 679 /* 680 * If this device got a regulatory hint tell core its 681 * free to listen now to a new shiny device regulatory hint 682 */ 683 wiphy_regulatory_deregister(wiphy); 684 685 cfg80211_rdev_list_generation++; 686 device_del(&rdev->wiphy.dev); 687 688 mutex_unlock(&cfg80211_mutex); 689 690 flush_work(&rdev->scan_done_wk); 691 cancel_work_sync(&rdev->conn_work); 692 flush_work(&rdev->event_work); 693 694 if (rdev->wowlan && rdev->ops->set_wakeup) 695 rdev_set_wakeup(rdev, false); 696 cfg80211_rdev_free_wowlan(rdev); 697 } 698 EXPORT_SYMBOL(wiphy_unregister); 699 700 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 701 { 702 struct cfg80211_internal_bss *scan, *tmp; 703 struct cfg80211_beacon_registration *reg, *treg; 704 rfkill_destroy(rdev->rfkill); 705 mutex_destroy(&rdev->mtx); 706 mutex_destroy(&rdev->devlist_mtx); 707 mutex_destroy(&rdev->sched_scan_mtx); 708 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 709 list_del(®->list); 710 kfree(reg); 711 } 712 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 713 cfg80211_put_bss(&scan->pub); 714 kfree(rdev); 715 } 716 717 void wiphy_free(struct wiphy *wiphy) 718 { 719 put_device(&wiphy->dev); 720 } 721 EXPORT_SYMBOL(wiphy_free); 722 723 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 724 { 725 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 726 727 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 728 schedule_work(&rdev->rfkill_sync); 729 } 730 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 731 732 static void wdev_cleanup_work(struct work_struct *work) 733 { 734 struct wireless_dev *wdev; 735 struct cfg80211_registered_device *rdev; 736 737 wdev = container_of(work, struct wireless_dev, cleanup_work); 738 rdev = wiphy_to_dev(wdev->wiphy); 739 740 cfg80211_lock_rdev(rdev); 741 742 if (WARN_ON(rdev->scan_req && rdev->scan_req->wdev == wdev)) { 743 rdev->scan_req->aborted = true; 744 ___cfg80211_scan_done(rdev, true); 745 } 746 747 cfg80211_unlock_rdev(rdev); 748 749 mutex_lock(&rdev->sched_scan_mtx); 750 751 if (WARN_ON(rdev->sched_scan_req && 752 rdev->sched_scan_req->dev == wdev->netdev)) { 753 __cfg80211_stop_sched_scan(rdev, false); 754 } 755 756 mutex_unlock(&rdev->sched_scan_mtx); 757 758 mutex_lock(&rdev->devlist_mtx); 759 rdev->opencount--; 760 mutex_unlock(&rdev->devlist_mtx); 761 wake_up(&rdev->dev_wait); 762 763 dev_put(wdev->netdev); 764 } 765 766 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 767 { 768 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy); 769 770 ASSERT_RTNL(); 771 772 if (WARN_ON(wdev->netdev)) 773 return; 774 775 mutex_lock(&rdev->devlist_mtx); 776 list_del_rcu(&wdev->list); 777 rdev->devlist_generation++; 778 779 switch (wdev->iftype) { 780 case NL80211_IFTYPE_P2P_DEVICE: 781 if (!wdev->p2p_started) 782 break; 783 rdev_stop_p2p_device(rdev, wdev); 784 wdev->p2p_started = false; 785 rdev->opencount--; 786 break; 787 default: 788 WARN_ON_ONCE(1); 789 break; 790 } 791 mutex_unlock(&rdev->devlist_mtx); 792 } 793 EXPORT_SYMBOL(cfg80211_unregister_wdev); 794 795 static struct device_type wiphy_type = { 796 .name = "wlan", 797 }; 798 799 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 800 enum nl80211_iftype iftype, int num) 801 { 802 ASSERT_RTNL(); 803 804 rdev->num_running_ifaces += num; 805 if (iftype == NL80211_IFTYPE_MONITOR) 806 rdev->num_running_monitor_ifaces += num; 807 } 808 809 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 810 unsigned long state, 811 void *ndev) 812 { 813 struct net_device *dev = ndev; 814 struct wireless_dev *wdev = dev->ieee80211_ptr; 815 struct cfg80211_registered_device *rdev; 816 int ret; 817 818 if (!wdev) 819 return NOTIFY_DONE; 820 821 rdev = wiphy_to_dev(wdev->wiphy); 822 823 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 824 825 switch (state) { 826 case NETDEV_POST_INIT: 827 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 828 break; 829 case NETDEV_REGISTER: 830 /* 831 * NB: cannot take rdev->mtx here because this may be 832 * called within code protected by it when interfaces 833 * are added with nl80211. 834 */ 835 mutex_init(&wdev->mtx); 836 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work); 837 INIT_LIST_HEAD(&wdev->event_list); 838 spin_lock_init(&wdev->event_lock); 839 INIT_LIST_HEAD(&wdev->mgmt_registrations); 840 spin_lock_init(&wdev->mgmt_registrations_lock); 841 842 mutex_lock(&rdev->devlist_mtx); 843 wdev->identifier = ++rdev->wdev_id; 844 list_add_rcu(&wdev->list, &rdev->wdev_list); 845 rdev->devlist_generation++; 846 /* can only change netns with wiphy */ 847 dev->features |= NETIF_F_NETNS_LOCAL; 848 849 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 850 "phy80211")) { 851 pr_err("failed to add phy80211 symlink to netdev!\n"); 852 } 853 wdev->netdev = dev; 854 wdev->sme_state = CFG80211_SME_IDLE; 855 mutex_unlock(&rdev->devlist_mtx); 856 #ifdef CONFIG_CFG80211_WEXT 857 wdev->wext.default_key = -1; 858 wdev->wext.default_mgmt_key = -1; 859 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 860 #endif 861 862 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 863 wdev->ps = true; 864 else 865 wdev->ps = false; 866 /* allow mac80211 to determine the timeout */ 867 wdev->ps_timeout = -1; 868 869 if (!dev->ethtool_ops) 870 dev->ethtool_ops = &cfg80211_ethtool_ops; 871 872 if ((wdev->iftype == NL80211_IFTYPE_STATION || 873 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 874 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 875 dev->priv_flags |= IFF_DONT_BRIDGE; 876 break; 877 case NETDEV_GOING_DOWN: 878 switch (wdev->iftype) { 879 case NL80211_IFTYPE_ADHOC: 880 cfg80211_leave_ibss(rdev, dev, true); 881 break; 882 case NL80211_IFTYPE_P2P_CLIENT: 883 case NL80211_IFTYPE_STATION: 884 mutex_lock(&rdev->sched_scan_mtx); 885 __cfg80211_stop_sched_scan(rdev, false); 886 mutex_unlock(&rdev->sched_scan_mtx); 887 888 wdev_lock(wdev); 889 #ifdef CONFIG_CFG80211_WEXT 890 kfree(wdev->wext.ie); 891 wdev->wext.ie = NULL; 892 wdev->wext.ie_len = 0; 893 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 894 #endif 895 __cfg80211_disconnect(rdev, dev, 896 WLAN_REASON_DEAUTH_LEAVING, true); 897 cfg80211_mlme_down(rdev, dev); 898 wdev_unlock(wdev); 899 break; 900 case NL80211_IFTYPE_MESH_POINT: 901 cfg80211_leave_mesh(rdev, dev); 902 break; 903 case NL80211_IFTYPE_AP: 904 cfg80211_stop_ap(rdev, dev); 905 break; 906 default: 907 break; 908 } 909 wdev->beacon_interval = 0; 910 break; 911 case NETDEV_DOWN: 912 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 913 dev_hold(dev); 914 queue_work(cfg80211_wq, &wdev->cleanup_work); 915 break; 916 case NETDEV_UP: 917 /* 918 * If we have a really quick DOWN/UP succession we may 919 * have this work still pending ... cancel it and see 920 * if it was pending, in which case we need to account 921 * for some of the work it would have done. 922 */ 923 if (cancel_work_sync(&wdev->cleanup_work)) { 924 mutex_lock(&rdev->devlist_mtx); 925 rdev->opencount--; 926 mutex_unlock(&rdev->devlist_mtx); 927 dev_put(dev); 928 } 929 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 930 cfg80211_lock_rdev(rdev); 931 mutex_lock(&rdev->devlist_mtx); 932 wdev_lock(wdev); 933 switch (wdev->iftype) { 934 #ifdef CONFIG_CFG80211_WEXT 935 case NL80211_IFTYPE_ADHOC: 936 cfg80211_ibss_wext_join(rdev, wdev); 937 break; 938 case NL80211_IFTYPE_STATION: 939 cfg80211_mgd_wext_connect(rdev, wdev); 940 break; 941 #endif 942 #ifdef CONFIG_MAC80211_MESH 943 case NL80211_IFTYPE_MESH_POINT: 944 { 945 /* backward compat code... */ 946 struct mesh_setup setup; 947 memcpy(&setup, &default_mesh_setup, 948 sizeof(setup)); 949 /* back compat only needed for mesh_id */ 950 setup.mesh_id = wdev->ssid; 951 setup.mesh_id_len = wdev->mesh_id_up_len; 952 if (wdev->mesh_id_up_len) 953 __cfg80211_join_mesh(rdev, dev, 954 &setup, 955 &default_mesh_config); 956 break; 957 } 958 #endif 959 default: 960 break; 961 } 962 wdev_unlock(wdev); 963 rdev->opencount++; 964 mutex_unlock(&rdev->devlist_mtx); 965 cfg80211_unlock_rdev(rdev); 966 967 /* 968 * Configure power management to the driver here so that its 969 * correctly set also after interface type changes etc. 970 */ 971 if ((wdev->iftype == NL80211_IFTYPE_STATION || 972 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 973 rdev->ops->set_power_mgmt) 974 if (rdev_set_power_mgmt(rdev, dev, wdev->ps, 975 wdev->ps_timeout)) { 976 /* assume this means it's off */ 977 wdev->ps = false; 978 } 979 break; 980 case NETDEV_UNREGISTER: 981 /* 982 * NB: cannot take rdev->mtx here because this may be 983 * called within code protected by it when interfaces 984 * are removed with nl80211. 985 */ 986 mutex_lock(&rdev->devlist_mtx); 987 /* 988 * It is possible to get NETDEV_UNREGISTER 989 * multiple times. To detect that, check 990 * that the interface is still on the list 991 * of registered interfaces, and only then 992 * remove and clean it up. 993 */ 994 if (!list_empty(&wdev->list)) { 995 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 996 list_del_rcu(&wdev->list); 997 rdev->devlist_generation++; 998 cfg80211_mlme_purge_registrations(wdev); 999 #ifdef CONFIG_CFG80211_WEXT 1000 kfree(wdev->wext.keys); 1001 #endif 1002 } 1003 mutex_unlock(&rdev->devlist_mtx); 1004 /* 1005 * synchronise (so that we won't find this netdev 1006 * from other code any more) and then clear the list 1007 * head so that the above code can safely check for 1008 * !list_empty() to avoid double-cleanup. 1009 */ 1010 synchronize_rcu(); 1011 INIT_LIST_HEAD(&wdev->list); 1012 /* 1013 * Ensure that all events have been processed and 1014 * freed. 1015 */ 1016 cfg80211_process_wdev_events(wdev); 1017 break; 1018 case NETDEV_PRE_UP: 1019 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 1020 return notifier_from_errno(-EOPNOTSUPP); 1021 if (rfkill_blocked(rdev->rfkill)) 1022 return notifier_from_errno(-ERFKILL); 1023 mutex_lock(&rdev->devlist_mtx); 1024 ret = cfg80211_can_add_interface(rdev, wdev->iftype); 1025 mutex_unlock(&rdev->devlist_mtx); 1026 if (ret) 1027 return notifier_from_errno(ret); 1028 break; 1029 } 1030 1031 return NOTIFY_DONE; 1032 } 1033 1034 static struct notifier_block cfg80211_netdev_notifier = { 1035 .notifier_call = cfg80211_netdev_notifier_call, 1036 }; 1037 1038 static void __net_exit cfg80211_pernet_exit(struct net *net) 1039 { 1040 struct cfg80211_registered_device *rdev; 1041 1042 rtnl_lock(); 1043 mutex_lock(&cfg80211_mutex); 1044 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1045 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1046 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1047 } 1048 mutex_unlock(&cfg80211_mutex); 1049 rtnl_unlock(); 1050 } 1051 1052 static struct pernet_operations cfg80211_pernet_ops = { 1053 .exit = cfg80211_pernet_exit, 1054 }; 1055 1056 static int __init cfg80211_init(void) 1057 { 1058 int err; 1059 1060 err = register_pernet_device(&cfg80211_pernet_ops); 1061 if (err) 1062 goto out_fail_pernet; 1063 1064 err = wiphy_sysfs_init(); 1065 if (err) 1066 goto out_fail_sysfs; 1067 1068 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1069 if (err) 1070 goto out_fail_notifier; 1071 1072 err = nl80211_init(); 1073 if (err) 1074 goto out_fail_nl80211; 1075 1076 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1077 1078 err = regulatory_init(); 1079 if (err) 1080 goto out_fail_reg; 1081 1082 cfg80211_wq = create_singlethread_workqueue("cfg80211"); 1083 if (!cfg80211_wq) 1084 goto out_fail_wq; 1085 1086 return 0; 1087 1088 out_fail_wq: 1089 regulatory_exit(); 1090 out_fail_reg: 1091 debugfs_remove(ieee80211_debugfs_dir); 1092 out_fail_nl80211: 1093 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1094 out_fail_notifier: 1095 wiphy_sysfs_exit(); 1096 out_fail_sysfs: 1097 unregister_pernet_device(&cfg80211_pernet_ops); 1098 out_fail_pernet: 1099 return err; 1100 } 1101 subsys_initcall(cfg80211_init); 1102 1103 static void __exit cfg80211_exit(void) 1104 { 1105 debugfs_remove(ieee80211_debugfs_dir); 1106 nl80211_exit(); 1107 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1108 wiphy_sysfs_exit(); 1109 regulatory_exit(); 1110 unregister_pernet_device(&cfg80211_pernet_ops); 1111 destroy_workqueue(cfg80211_wq); 1112 } 1113 module_exit(cfg80211_exit); 1114