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 continue; 237 } 238 /* otherwise, check iftype */ 239 switch (wdev->iftype) { 240 case NL80211_IFTYPE_P2P_DEVICE: 241 if (!wdev->p2p_started) 242 break; 243 rdev->ops->stop_p2p_device(&rdev->wiphy, wdev); 244 wdev->p2p_started = false; 245 rdev->opencount--; 246 break; 247 default: 248 break; 249 } 250 } 251 252 mutex_unlock(&rdev->devlist_mtx); 253 rtnl_unlock(); 254 255 return 0; 256 } 257 258 static void cfg80211_rfkill_sync_work(struct work_struct *work) 259 { 260 struct cfg80211_registered_device *rdev; 261 262 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync); 263 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill)); 264 } 265 266 static void cfg80211_event_work(struct work_struct *work) 267 { 268 struct cfg80211_registered_device *rdev; 269 270 rdev = container_of(work, struct cfg80211_registered_device, 271 event_work); 272 273 rtnl_lock(); 274 cfg80211_lock_rdev(rdev); 275 276 cfg80211_process_rdev_events(rdev); 277 cfg80211_unlock_rdev(rdev); 278 rtnl_unlock(); 279 } 280 281 /* exported functions */ 282 283 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv) 284 { 285 static int wiphy_counter; 286 287 struct cfg80211_registered_device *rdev; 288 int alloc_size; 289 290 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 291 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 292 WARN_ON(ops->connect && !ops->disconnect); 293 WARN_ON(ops->join_ibss && !ops->leave_ibss); 294 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 295 WARN_ON(ops->add_station && !ops->del_station); 296 WARN_ON(ops->add_mpath && !ops->del_mpath); 297 WARN_ON(ops->join_mesh && !ops->leave_mesh); 298 299 alloc_size = sizeof(*rdev) + sizeof_priv; 300 301 rdev = kzalloc(alloc_size, GFP_KERNEL); 302 if (!rdev) 303 return NULL; 304 305 rdev->ops = ops; 306 307 mutex_lock(&cfg80211_mutex); 308 309 rdev->wiphy_idx = wiphy_counter++; 310 311 if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) { 312 wiphy_counter--; 313 mutex_unlock(&cfg80211_mutex); 314 /* ugh, wrapped! */ 315 kfree(rdev); 316 return NULL; 317 } 318 319 mutex_unlock(&cfg80211_mutex); 320 321 /* give it a proper name */ 322 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 323 324 mutex_init(&rdev->mtx); 325 mutex_init(&rdev->devlist_mtx); 326 mutex_init(&rdev->sched_scan_mtx); 327 INIT_LIST_HEAD(&rdev->wdev_list); 328 spin_lock_init(&rdev->bss_lock); 329 INIT_LIST_HEAD(&rdev->bss_list); 330 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 331 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results); 332 #ifdef CONFIG_CFG80211_WEXT 333 rdev->wiphy.wext = &cfg80211_wext_handler; 334 #endif 335 336 device_initialize(&rdev->wiphy.dev); 337 rdev->wiphy.dev.class = &ieee80211_class; 338 rdev->wiphy.dev.platform_data = rdev; 339 340 #ifdef CONFIG_CFG80211_DEFAULT_PS 341 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 342 #endif 343 344 wiphy_net_set(&rdev->wiphy, &init_net); 345 346 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 347 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 348 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 349 &rdev->rfkill_ops, rdev); 350 351 if (!rdev->rfkill) { 352 kfree(rdev); 353 return NULL; 354 } 355 356 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); 357 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 358 INIT_WORK(&rdev->event_work, cfg80211_event_work); 359 360 init_waitqueue_head(&rdev->dev_wait); 361 362 /* 363 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 364 * Fragmentation and RTS threshold are disabled by default with the 365 * special -1 value. 366 */ 367 rdev->wiphy.retry_short = 7; 368 rdev->wiphy.retry_long = 4; 369 rdev->wiphy.frag_threshold = (u32) -1; 370 rdev->wiphy.rts_threshold = (u32) -1; 371 rdev->wiphy.coverage_class = 0; 372 373 return &rdev->wiphy; 374 } 375 EXPORT_SYMBOL(wiphy_new); 376 377 static int wiphy_verify_combinations(struct wiphy *wiphy) 378 { 379 const struct ieee80211_iface_combination *c; 380 int i, j; 381 382 for (i = 0; i < wiphy->n_iface_combinations; i++) { 383 u32 cnt = 0; 384 u16 all_iftypes = 0; 385 386 c = &wiphy->iface_combinations[i]; 387 388 /* Combinations with just one interface aren't real */ 389 if (WARN_ON(c->max_interfaces < 2)) 390 return -EINVAL; 391 392 /* Need at least one channel */ 393 if (WARN_ON(!c->num_different_channels)) 394 return -EINVAL; 395 396 /* 397 * Put a sane limit on maximum number of different 398 * channels to simplify channel accounting code. 399 */ 400 if (WARN_ON(c->num_different_channels > 401 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 402 return -EINVAL; 403 404 if (WARN_ON(!c->n_limits)) 405 return -EINVAL; 406 407 for (j = 0; j < c->n_limits; j++) { 408 u16 types = c->limits[j].types; 409 410 /* 411 * interface types shouldn't overlap, this is 412 * used in cfg80211_can_change_interface() 413 */ 414 if (WARN_ON(types & all_iftypes)) 415 return -EINVAL; 416 all_iftypes |= types; 417 418 if (WARN_ON(!c->limits[j].max)) 419 return -EINVAL; 420 421 /* Shouldn't list software iftypes in combinations! */ 422 if (WARN_ON(wiphy->software_iftypes & types)) 423 return -EINVAL; 424 425 /* Only a single P2P_DEVICE can be allowed */ 426 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 427 c->limits[j].max > 1)) 428 return -EINVAL; 429 430 cnt += c->limits[j].max; 431 /* 432 * Don't advertise an unsupported type 433 * in a combination. 434 */ 435 if (WARN_ON((wiphy->interface_modes & types) != types)) 436 return -EINVAL; 437 } 438 439 /* You can't even choose that many! */ 440 if (WARN_ON(cnt < c->max_interfaces)) 441 return -EINVAL; 442 } 443 444 return 0; 445 } 446 447 int wiphy_register(struct wiphy *wiphy) 448 { 449 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 450 int res; 451 enum ieee80211_band band; 452 struct ieee80211_supported_band *sband; 453 bool have_band = false; 454 int i; 455 u16 ifmodes = wiphy->interface_modes; 456 457 #ifdef CONFIG_PM 458 if (WARN_ON((wiphy->wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 459 !(wiphy->wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 460 return -EINVAL; 461 #endif 462 463 if (WARN_ON(wiphy->ap_sme_capa && 464 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 465 return -EINVAL; 466 467 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 468 return -EINVAL; 469 470 if (WARN_ON(wiphy->addresses && 471 !is_zero_ether_addr(wiphy->perm_addr) && 472 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 473 ETH_ALEN))) 474 return -EINVAL; 475 476 if (wiphy->addresses) 477 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 478 479 /* sanity check ifmodes */ 480 WARN_ON(!ifmodes); 481 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 482 if (WARN_ON(ifmodes != wiphy->interface_modes)) 483 wiphy->interface_modes = ifmodes; 484 485 res = wiphy_verify_combinations(wiphy); 486 if (res) 487 return res; 488 489 /* sanity check supported bands/channels */ 490 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 491 sband = wiphy->bands[band]; 492 if (!sband) 493 continue; 494 495 sband->band = band; 496 if (WARN_ON(!sband->n_channels)) 497 return -EINVAL; 498 /* 499 * on 60gHz band, there are no legacy rates, so 500 * n_bitrates is 0 501 */ 502 if (WARN_ON(band != IEEE80211_BAND_60GHZ && 503 !sband->n_bitrates)) 504 return -EINVAL; 505 506 /* 507 * Since cfg80211_disable_40mhz_24ghz is global, we can 508 * modify the sband's ht data even if the driver uses a 509 * global structure for that. 510 */ 511 if (cfg80211_disable_40mhz_24ghz && 512 band == IEEE80211_BAND_2GHZ && 513 sband->ht_cap.ht_supported) { 514 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 515 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 516 } 517 518 /* 519 * Since we use a u32 for rate bitmaps in 520 * ieee80211_get_response_rate, we cannot 521 * have more than 32 legacy rates. 522 */ 523 if (WARN_ON(sband->n_bitrates > 32)) 524 return -EINVAL; 525 526 for (i = 0; i < sband->n_channels; i++) { 527 sband->channels[i].orig_flags = 528 sband->channels[i].flags; 529 sband->channels[i].orig_mag = INT_MAX; 530 sband->channels[i].orig_mpwr = 531 sband->channels[i].max_power; 532 sband->channels[i].band = band; 533 } 534 535 have_band = true; 536 } 537 538 if (!have_band) { 539 WARN_ON(1); 540 return -EINVAL; 541 } 542 543 #ifdef CONFIG_PM 544 if (rdev->wiphy.wowlan.n_patterns) { 545 if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len || 546 rdev->wiphy.wowlan.pattern_min_len > 547 rdev->wiphy.wowlan.pattern_max_len)) 548 return -EINVAL; 549 } 550 #endif 551 552 /* check and set up bitrates */ 553 ieee80211_set_bitrate_flags(wiphy); 554 555 mutex_lock(&cfg80211_mutex); 556 557 res = device_add(&rdev->wiphy.dev); 558 if (res) { 559 mutex_unlock(&cfg80211_mutex); 560 return res; 561 } 562 563 /* set up regulatory info */ 564 wiphy_regulatory_register(wiphy); 565 566 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 567 cfg80211_rdev_list_generation++; 568 569 /* add to debugfs */ 570 rdev->wiphy.debugfsdir = 571 debugfs_create_dir(wiphy_name(&rdev->wiphy), 572 ieee80211_debugfs_dir); 573 if (IS_ERR(rdev->wiphy.debugfsdir)) 574 rdev->wiphy.debugfsdir = NULL; 575 576 if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { 577 struct regulatory_request request; 578 579 request.wiphy_idx = get_wiphy_idx(wiphy); 580 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 581 request.alpha2[0] = '9'; 582 request.alpha2[1] = '9'; 583 584 nl80211_send_reg_change_event(&request); 585 } 586 587 cfg80211_debugfs_rdev_add(rdev); 588 mutex_unlock(&cfg80211_mutex); 589 590 /* 591 * due to a locking dependency this has to be outside of the 592 * cfg80211_mutex lock 593 */ 594 res = rfkill_register(rdev->rfkill); 595 if (res) 596 goto out_rm_dev; 597 598 rtnl_lock(); 599 rdev->wiphy.registered = true; 600 rtnl_unlock(); 601 return 0; 602 603 out_rm_dev: 604 device_del(&rdev->wiphy.dev); 605 return res; 606 } 607 EXPORT_SYMBOL(wiphy_register); 608 609 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 610 { 611 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 612 613 if (!rdev->ops->rfkill_poll) 614 return; 615 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 616 rfkill_resume_polling(rdev->rfkill); 617 } 618 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 619 620 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 621 { 622 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 623 624 rfkill_pause_polling(rdev->rfkill); 625 } 626 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 627 628 void wiphy_unregister(struct wiphy *wiphy) 629 { 630 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 631 632 rtnl_lock(); 633 rdev->wiphy.registered = false; 634 rtnl_unlock(); 635 636 rfkill_unregister(rdev->rfkill); 637 638 /* protect the device list */ 639 mutex_lock(&cfg80211_mutex); 640 641 wait_event(rdev->dev_wait, ({ 642 int __count; 643 mutex_lock(&rdev->devlist_mtx); 644 __count = rdev->opencount; 645 mutex_unlock(&rdev->devlist_mtx); 646 __count == 0; })); 647 648 mutex_lock(&rdev->devlist_mtx); 649 BUG_ON(!list_empty(&rdev->wdev_list)); 650 mutex_unlock(&rdev->devlist_mtx); 651 652 /* 653 * First remove the hardware from everywhere, this makes 654 * it impossible to find from userspace. 655 */ 656 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 657 list_del_rcu(&rdev->list); 658 synchronize_rcu(); 659 660 /* 661 * Try to grab rdev->mtx. If a command is still in progress, 662 * hopefully the driver will refuse it since it's tearing 663 * down the device already. We wait for this command to complete 664 * before unlinking the item from the list. 665 * Note: as codified by the BUG_ON above we cannot get here if 666 * a virtual interface is still present. Hence, we can only get 667 * to lock contention here if userspace issues a command that 668 * identified the hardware by wiphy index. 669 */ 670 cfg80211_lock_rdev(rdev); 671 /* nothing */ 672 cfg80211_unlock_rdev(rdev); 673 674 /* 675 * If this device got a regulatory hint tell core its 676 * free to listen now to a new shiny device regulatory hint 677 */ 678 wiphy_regulatory_deregister(wiphy); 679 680 cfg80211_rdev_list_generation++; 681 device_del(&rdev->wiphy.dev); 682 683 mutex_unlock(&cfg80211_mutex); 684 685 flush_work(&rdev->scan_done_wk); 686 cancel_work_sync(&rdev->conn_work); 687 flush_work(&rdev->event_work); 688 689 if (rdev->wowlan && rdev->ops->set_wakeup) 690 rdev->ops->set_wakeup(&rdev->wiphy, false); 691 cfg80211_rdev_free_wowlan(rdev); 692 } 693 EXPORT_SYMBOL(wiphy_unregister); 694 695 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 696 { 697 struct cfg80211_internal_bss *scan, *tmp; 698 rfkill_destroy(rdev->rfkill); 699 mutex_destroy(&rdev->mtx); 700 mutex_destroy(&rdev->devlist_mtx); 701 mutex_destroy(&rdev->sched_scan_mtx); 702 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 703 cfg80211_put_bss(&scan->pub); 704 kfree(rdev); 705 } 706 707 void wiphy_free(struct wiphy *wiphy) 708 { 709 put_device(&wiphy->dev); 710 } 711 EXPORT_SYMBOL(wiphy_free); 712 713 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 714 { 715 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 716 717 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 718 schedule_work(&rdev->rfkill_sync); 719 } 720 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 721 722 static void wdev_cleanup_work(struct work_struct *work) 723 { 724 struct wireless_dev *wdev; 725 struct cfg80211_registered_device *rdev; 726 727 wdev = container_of(work, struct wireless_dev, cleanup_work); 728 rdev = wiphy_to_dev(wdev->wiphy); 729 730 cfg80211_lock_rdev(rdev); 731 732 if (WARN_ON(rdev->scan_req && rdev->scan_req->wdev == wdev)) { 733 rdev->scan_req->aborted = true; 734 ___cfg80211_scan_done(rdev, true); 735 } 736 737 cfg80211_unlock_rdev(rdev); 738 739 mutex_lock(&rdev->sched_scan_mtx); 740 741 if (WARN_ON(rdev->sched_scan_req && 742 rdev->sched_scan_req->dev == wdev->netdev)) { 743 __cfg80211_stop_sched_scan(rdev, false); 744 } 745 746 mutex_unlock(&rdev->sched_scan_mtx); 747 748 mutex_lock(&rdev->devlist_mtx); 749 rdev->opencount--; 750 mutex_unlock(&rdev->devlist_mtx); 751 wake_up(&rdev->dev_wait); 752 753 dev_put(wdev->netdev); 754 } 755 756 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 757 { 758 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy); 759 760 ASSERT_RTNL(); 761 762 if (WARN_ON(wdev->netdev)) 763 return; 764 765 mutex_lock(&rdev->devlist_mtx); 766 list_del_rcu(&wdev->list); 767 rdev->devlist_generation++; 768 769 switch (wdev->iftype) { 770 case NL80211_IFTYPE_P2P_DEVICE: 771 if (!wdev->p2p_started) 772 break; 773 rdev->ops->stop_p2p_device(&rdev->wiphy, wdev); 774 wdev->p2p_started = false; 775 rdev->opencount--; 776 break; 777 default: 778 WARN_ON_ONCE(1); 779 break; 780 } 781 mutex_unlock(&rdev->devlist_mtx); 782 } 783 EXPORT_SYMBOL(cfg80211_unregister_wdev); 784 785 static struct device_type wiphy_type = { 786 .name = "wlan", 787 }; 788 789 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 790 enum nl80211_iftype iftype, int num) 791 { 792 ASSERT_RTNL(); 793 794 rdev->num_running_ifaces += num; 795 if (iftype == NL80211_IFTYPE_MONITOR) 796 rdev->num_running_monitor_ifaces += num; 797 } 798 799 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 800 unsigned long state, 801 void *ndev) 802 { 803 struct net_device *dev = ndev; 804 struct wireless_dev *wdev = dev->ieee80211_ptr; 805 struct cfg80211_registered_device *rdev; 806 int ret; 807 808 if (!wdev) 809 return NOTIFY_DONE; 810 811 rdev = wiphy_to_dev(wdev->wiphy); 812 813 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 814 815 switch (state) { 816 case NETDEV_POST_INIT: 817 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 818 break; 819 case NETDEV_REGISTER: 820 /* 821 * NB: cannot take rdev->mtx here because this may be 822 * called within code protected by it when interfaces 823 * are added with nl80211. 824 */ 825 mutex_init(&wdev->mtx); 826 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work); 827 INIT_LIST_HEAD(&wdev->event_list); 828 spin_lock_init(&wdev->event_lock); 829 INIT_LIST_HEAD(&wdev->mgmt_registrations); 830 spin_lock_init(&wdev->mgmt_registrations_lock); 831 832 mutex_lock(&rdev->devlist_mtx); 833 wdev->identifier = ++rdev->wdev_id; 834 list_add_rcu(&wdev->list, &rdev->wdev_list); 835 rdev->devlist_generation++; 836 /* can only change netns with wiphy */ 837 dev->features |= NETIF_F_NETNS_LOCAL; 838 839 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 840 "phy80211")) { 841 pr_err("failed to add phy80211 symlink to netdev!\n"); 842 } 843 wdev->netdev = dev; 844 wdev->sme_state = CFG80211_SME_IDLE; 845 mutex_unlock(&rdev->devlist_mtx); 846 #ifdef CONFIG_CFG80211_WEXT 847 wdev->wext.default_key = -1; 848 wdev->wext.default_mgmt_key = -1; 849 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 850 #endif 851 852 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 853 wdev->ps = true; 854 else 855 wdev->ps = false; 856 /* allow mac80211 to determine the timeout */ 857 wdev->ps_timeout = -1; 858 859 if (!dev->ethtool_ops) 860 dev->ethtool_ops = &cfg80211_ethtool_ops; 861 862 if ((wdev->iftype == NL80211_IFTYPE_STATION || 863 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 864 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 865 dev->priv_flags |= IFF_DONT_BRIDGE; 866 break; 867 case NETDEV_GOING_DOWN: 868 switch (wdev->iftype) { 869 case NL80211_IFTYPE_ADHOC: 870 cfg80211_leave_ibss(rdev, dev, true); 871 break; 872 case NL80211_IFTYPE_P2P_CLIENT: 873 case NL80211_IFTYPE_STATION: 874 mutex_lock(&rdev->sched_scan_mtx); 875 __cfg80211_stop_sched_scan(rdev, false); 876 mutex_unlock(&rdev->sched_scan_mtx); 877 878 wdev_lock(wdev); 879 #ifdef CONFIG_CFG80211_WEXT 880 kfree(wdev->wext.ie); 881 wdev->wext.ie = NULL; 882 wdev->wext.ie_len = 0; 883 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 884 #endif 885 __cfg80211_disconnect(rdev, dev, 886 WLAN_REASON_DEAUTH_LEAVING, true); 887 cfg80211_mlme_down(rdev, dev); 888 wdev_unlock(wdev); 889 break; 890 case NL80211_IFTYPE_MESH_POINT: 891 cfg80211_leave_mesh(rdev, dev); 892 break; 893 case NL80211_IFTYPE_AP: 894 cfg80211_stop_ap(rdev, dev); 895 break; 896 default: 897 break; 898 } 899 wdev->beacon_interval = 0; 900 break; 901 case NETDEV_DOWN: 902 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 903 dev_hold(dev); 904 queue_work(cfg80211_wq, &wdev->cleanup_work); 905 break; 906 case NETDEV_UP: 907 /* 908 * If we have a really quick DOWN/UP succession we may 909 * have this work still pending ... cancel it and see 910 * if it was pending, in which case we need to account 911 * for some of the work it would have done. 912 */ 913 if (cancel_work_sync(&wdev->cleanup_work)) { 914 mutex_lock(&rdev->devlist_mtx); 915 rdev->opencount--; 916 mutex_unlock(&rdev->devlist_mtx); 917 dev_put(dev); 918 } 919 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 920 cfg80211_lock_rdev(rdev); 921 mutex_lock(&rdev->devlist_mtx); 922 wdev_lock(wdev); 923 switch (wdev->iftype) { 924 #ifdef CONFIG_CFG80211_WEXT 925 case NL80211_IFTYPE_ADHOC: 926 cfg80211_ibss_wext_join(rdev, wdev); 927 break; 928 case NL80211_IFTYPE_STATION: 929 cfg80211_mgd_wext_connect(rdev, wdev); 930 break; 931 #endif 932 #ifdef CONFIG_MAC80211_MESH 933 case NL80211_IFTYPE_MESH_POINT: 934 { 935 /* backward compat code... */ 936 struct mesh_setup setup; 937 memcpy(&setup, &default_mesh_setup, 938 sizeof(setup)); 939 /* back compat only needed for mesh_id */ 940 setup.mesh_id = wdev->ssid; 941 setup.mesh_id_len = wdev->mesh_id_up_len; 942 if (wdev->mesh_id_up_len) 943 __cfg80211_join_mesh(rdev, dev, 944 &setup, 945 &default_mesh_config); 946 break; 947 } 948 #endif 949 default: 950 break; 951 } 952 wdev_unlock(wdev); 953 rdev->opencount++; 954 mutex_unlock(&rdev->devlist_mtx); 955 cfg80211_unlock_rdev(rdev); 956 957 /* 958 * Configure power management to the driver here so that its 959 * correctly set also after interface type changes etc. 960 */ 961 if ((wdev->iftype == NL80211_IFTYPE_STATION || 962 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 963 rdev->ops->set_power_mgmt) 964 if (rdev->ops->set_power_mgmt(wdev->wiphy, dev, 965 wdev->ps, 966 wdev->ps_timeout)) { 967 /* assume this means it's off */ 968 wdev->ps = false; 969 } 970 break; 971 case NETDEV_UNREGISTER: 972 /* 973 * NB: cannot take rdev->mtx here because this may be 974 * called within code protected by it when interfaces 975 * are removed with nl80211. 976 */ 977 mutex_lock(&rdev->devlist_mtx); 978 /* 979 * It is possible to get NETDEV_UNREGISTER 980 * multiple times. To detect that, check 981 * that the interface is still on the list 982 * of registered interfaces, and only then 983 * remove and clean it up. 984 */ 985 if (!list_empty(&wdev->list)) { 986 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 987 list_del_rcu(&wdev->list); 988 rdev->devlist_generation++; 989 cfg80211_mlme_purge_registrations(wdev); 990 #ifdef CONFIG_CFG80211_WEXT 991 kfree(wdev->wext.keys); 992 #endif 993 } 994 mutex_unlock(&rdev->devlist_mtx); 995 /* 996 * synchronise (so that we won't find this netdev 997 * from other code any more) and then clear the list 998 * head so that the above code can safely check for 999 * !list_empty() to avoid double-cleanup. 1000 */ 1001 synchronize_rcu(); 1002 INIT_LIST_HEAD(&wdev->list); 1003 /* 1004 * Ensure that all events have been processed and 1005 * freed. 1006 */ 1007 cfg80211_process_wdev_events(wdev); 1008 break; 1009 case NETDEV_PRE_UP: 1010 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 1011 return notifier_from_errno(-EOPNOTSUPP); 1012 if (rfkill_blocked(rdev->rfkill)) 1013 return notifier_from_errno(-ERFKILL); 1014 mutex_lock(&rdev->devlist_mtx); 1015 ret = cfg80211_can_add_interface(rdev, wdev->iftype); 1016 mutex_unlock(&rdev->devlist_mtx); 1017 if (ret) 1018 return notifier_from_errno(ret); 1019 break; 1020 } 1021 1022 return NOTIFY_DONE; 1023 } 1024 1025 static struct notifier_block cfg80211_netdev_notifier = { 1026 .notifier_call = cfg80211_netdev_notifier_call, 1027 }; 1028 1029 static void __net_exit cfg80211_pernet_exit(struct net *net) 1030 { 1031 struct cfg80211_registered_device *rdev; 1032 1033 rtnl_lock(); 1034 mutex_lock(&cfg80211_mutex); 1035 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1036 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1037 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1038 } 1039 mutex_unlock(&cfg80211_mutex); 1040 rtnl_unlock(); 1041 } 1042 1043 static struct pernet_operations cfg80211_pernet_ops = { 1044 .exit = cfg80211_pernet_exit, 1045 }; 1046 1047 static int __init cfg80211_init(void) 1048 { 1049 int err; 1050 1051 err = register_pernet_device(&cfg80211_pernet_ops); 1052 if (err) 1053 goto out_fail_pernet; 1054 1055 err = wiphy_sysfs_init(); 1056 if (err) 1057 goto out_fail_sysfs; 1058 1059 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1060 if (err) 1061 goto out_fail_notifier; 1062 1063 err = nl80211_init(); 1064 if (err) 1065 goto out_fail_nl80211; 1066 1067 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1068 1069 err = regulatory_init(); 1070 if (err) 1071 goto out_fail_reg; 1072 1073 cfg80211_wq = create_singlethread_workqueue("cfg80211"); 1074 if (!cfg80211_wq) 1075 goto out_fail_wq; 1076 1077 return 0; 1078 1079 out_fail_wq: 1080 regulatory_exit(); 1081 out_fail_reg: 1082 debugfs_remove(ieee80211_debugfs_dir); 1083 out_fail_nl80211: 1084 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1085 out_fail_notifier: 1086 wiphy_sysfs_exit(); 1087 out_fail_sysfs: 1088 unregister_pernet_device(&cfg80211_pernet_ops); 1089 out_fail_pernet: 1090 return err; 1091 } 1092 subsys_initcall(cfg80211_init); 1093 1094 static void __exit cfg80211_exit(void) 1095 { 1096 debugfs_remove(ieee80211_debugfs_dir); 1097 nl80211_exit(); 1098 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1099 wiphy_sysfs_exit(); 1100 regulatory_exit(); 1101 unregister_pernet_device(&cfg80211_pernet_ops); 1102 destroy_workqueue(cfg80211_wq); 1103 } 1104 module_exit(cfg80211_exit); 1105