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 = 530 sband->channels[i].max_antenna_gain; 531 sband->channels[i].orig_mpwr = 532 sband->channels[i].max_power; 533 sband->channels[i].band = band; 534 } 535 536 have_band = true; 537 } 538 539 if (!have_band) { 540 WARN_ON(1); 541 return -EINVAL; 542 } 543 544 #ifdef CONFIG_PM 545 if (rdev->wiphy.wowlan.n_patterns) { 546 if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len || 547 rdev->wiphy.wowlan.pattern_min_len > 548 rdev->wiphy.wowlan.pattern_max_len)) 549 return -EINVAL; 550 } 551 #endif 552 553 /* check and set up bitrates */ 554 ieee80211_set_bitrate_flags(wiphy); 555 556 mutex_lock(&cfg80211_mutex); 557 558 res = device_add(&rdev->wiphy.dev); 559 if (res) { 560 mutex_unlock(&cfg80211_mutex); 561 return res; 562 } 563 564 /* set up regulatory info */ 565 wiphy_regulatory_register(wiphy); 566 567 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 568 cfg80211_rdev_list_generation++; 569 570 /* add to debugfs */ 571 rdev->wiphy.debugfsdir = 572 debugfs_create_dir(wiphy_name(&rdev->wiphy), 573 ieee80211_debugfs_dir); 574 if (IS_ERR(rdev->wiphy.debugfsdir)) 575 rdev->wiphy.debugfsdir = NULL; 576 577 if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { 578 struct regulatory_request request; 579 580 request.wiphy_idx = get_wiphy_idx(wiphy); 581 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 582 request.alpha2[0] = '9'; 583 request.alpha2[1] = '9'; 584 585 nl80211_send_reg_change_event(&request); 586 } 587 588 cfg80211_debugfs_rdev_add(rdev); 589 mutex_unlock(&cfg80211_mutex); 590 591 /* 592 * due to a locking dependency this has to be outside of the 593 * cfg80211_mutex lock 594 */ 595 res = rfkill_register(rdev->rfkill); 596 if (res) 597 goto out_rm_dev; 598 599 rtnl_lock(); 600 rdev->wiphy.registered = true; 601 rtnl_unlock(); 602 return 0; 603 604 out_rm_dev: 605 device_del(&rdev->wiphy.dev); 606 return res; 607 } 608 EXPORT_SYMBOL(wiphy_register); 609 610 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 611 { 612 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 613 614 if (!rdev->ops->rfkill_poll) 615 return; 616 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 617 rfkill_resume_polling(rdev->rfkill); 618 } 619 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 620 621 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 622 { 623 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 624 625 rfkill_pause_polling(rdev->rfkill); 626 } 627 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 628 629 void wiphy_unregister(struct wiphy *wiphy) 630 { 631 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 632 633 rtnl_lock(); 634 rdev->wiphy.registered = false; 635 rtnl_unlock(); 636 637 rfkill_unregister(rdev->rfkill); 638 639 /* protect the device list */ 640 mutex_lock(&cfg80211_mutex); 641 642 wait_event(rdev->dev_wait, ({ 643 int __count; 644 mutex_lock(&rdev->devlist_mtx); 645 __count = rdev->opencount; 646 mutex_unlock(&rdev->devlist_mtx); 647 __count == 0; })); 648 649 mutex_lock(&rdev->devlist_mtx); 650 BUG_ON(!list_empty(&rdev->wdev_list)); 651 mutex_unlock(&rdev->devlist_mtx); 652 653 /* 654 * First remove the hardware from everywhere, this makes 655 * it impossible to find from userspace. 656 */ 657 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 658 list_del_rcu(&rdev->list); 659 synchronize_rcu(); 660 661 /* 662 * Try to grab rdev->mtx. If a command is still in progress, 663 * hopefully the driver will refuse it since it's tearing 664 * down the device already. We wait for this command to complete 665 * before unlinking the item from the list. 666 * Note: as codified by the BUG_ON above we cannot get here if 667 * a virtual interface is still present. Hence, we can only get 668 * to lock contention here if userspace issues a command that 669 * identified the hardware by wiphy index. 670 */ 671 cfg80211_lock_rdev(rdev); 672 /* nothing */ 673 cfg80211_unlock_rdev(rdev); 674 675 /* 676 * If this device got a regulatory hint tell core its 677 * free to listen now to a new shiny device regulatory hint 678 */ 679 wiphy_regulatory_deregister(wiphy); 680 681 cfg80211_rdev_list_generation++; 682 device_del(&rdev->wiphy.dev); 683 684 mutex_unlock(&cfg80211_mutex); 685 686 flush_work(&rdev->scan_done_wk); 687 cancel_work_sync(&rdev->conn_work); 688 flush_work(&rdev->event_work); 689 690 if (rdev->wowlan && rdev->ops->set_wakeup) 691 rdev->ops->set_wakeup(&rdev->wiphy, false); 692 cfg80211_rdev_free_wowlan(rdev); 693 } 694 EXPORT_SYMBOL(wiphy_unregister); 695 696 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 697 { 698 struct cfg80211_internal_bss *scan, *tmp; 699 rfkill_destroy(rdev->rfkill); 700 mutex_destroy(&rdev->mtx); 701 mutex_destroy(&rdev->devlist_mtx); 702 mutex_destroy(&rdev->sched_scan_mtx); 703 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 704 cfg80211_put_bss(&scan->pub); 705 kfree(rdev); 706 } 707 708 void wiphy_free(struct wiphy *wiphy) 709 { 710 put_device(&wiphy->dev); 711 } 712 EXPORT_SYMBOL(wiphy_free); 713 714 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 715 { 716 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 717 718 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 719 schedule_work(&rdev->rfkill_sync); 720 } 721 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 722 723 static void wdev_cleanup_work(struct work_struct *work) 724 { 725 struct wireless_dev *wdev; 726 struct cfg80211_registered_device *rdev; 727 728 wdev = container_of(work, struct wireless_dev, cleanup_work); 729 rdev = wiphy_to_dev(wdev->wiphy); 730 731 cfg80211_lock_rdev(rdev); 732 733 if (WARN_ON(rdev->scan_req && rdev->scan_req->wdev == wdev)) { 734 rdev->scan_req->aborted = true; 735 ___cfg80211_scan_done(rdev, true); 736 } 737 738 cfg80211_unlock_rdev(rdev); 739 740 mutex_lock(&rdev->sched_scan_mtx); 741 742 if (WARN_ON(rdev->sched_scan_req && 743 rdev->sched_scan_req->dev == wdev->netdev)) { 744 __cfg80211_stop_sched_scan(rdev, false); 745 } 746 747 mutex_unlock(&rdev->sched_scan_mtx); 748 749 mutex_lock(&rdev->devlist_mtx); 750 rdev->opencount--; 751 mutex_unlock(&rdev->devlist_mtx); 752 wake_up(&rdev->dev_wait); 753 754 dev_put(wdev->netdev); 755 } 756 757 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 758 { 759 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy); 760 761 ASSERT_RTNL(); 762 763 if (WARN_ON(wdev->netdev)) 764 return; 765 766 mutex_lock(&rdev->devlist_mtx); 767 list_del_rcu(&wdev->list); 768 rdev->devlist_generation++; 769 770 switch (wdev->iftype) { 771 case NL80211_IFTYPE_P2P_DEVICE: 772 if (!wdev->p2p_started) 773 break; 774 rdev->ops->stop_p2p_device(&rdev->wiphy, wdev); 775 wdev->p2p_started = false; 776 rdev->opencount--; 777 break; 778 default: 779 WARN_ON_ONCE(1); 780 break; 781 } 782 mutex_unlock(&rdev->devlist_mtx); 783 } 784 EXPORT_SYMBOL(cfg80211_unregister_wdev); 785 786 static struct device_type wiphy_type = { 787 .name = "wlan", 788 }; 789 790 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 791 enum nl80211_iftype iftype, int num) 792 { 793 ASSERT_RTNL(); 794 795 rdev->num_running_ifaces += num; 796 if (iftype == NL80211_IFTYPE_MONITOR) 797 rdev->num_running_monitor_ifaces += num; 798 } 799 800 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 801 unsigned long state, 802 void *ndev) 803 { 804 struct net_device *dev = ndev; 805 struct wireless_dev *wdev = dev->ieee80211_ptr; 806 struct cfg80211_registered_device *rdev; 807 int ret; 808 809 if (!wdev) 810 return NOTIFY_DONE; 811 812 rdev = wiphy_to_dev(wdev->wiphy); 813 814 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 815 816 switch (state) { 817 case NETDEV_POST_INIT: 818 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 819 break; 820 case NETDEV_REGISTER: 821 /* 822 * NB: cannot take rdev->mtx here because this may be 823 * called within code protected by it when interfaces 824 * are added with nl80211. 825 */ 826 mutex_init(&wdev->mtx); 827 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work); 828 INIT_LIST_HEAD(&wdev->event_list); 829 spin_lock_init(&wdev->event_lock); 830 INIT_LIST_HEAD(&wdev->mgmt_registrations); 831 spin_lock_init(&wdev->mgmt_registrations_lock); 832 833 mutex_lock(&rdev->devlist_mtx); 834 wdev->identifier = ++rdev->wdev_id; 835 list_add_rcu(&wdev->list, &rdev->wdev_list); 836 rdev->devlist_generation++; 837 /* can only change netns with wiphy */ 838 dev->features |= NETIF_F_NETNS_LOCAL; 839 840 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 841 "phy80211")) { 842 pr_err("failed to add phy80211 symlink to netdev!\n"); 843 } 844 wdev->netdev = dev; 845 wdev->sme_state = CFG80211_SME_IDLE; 846 mutex_unlock(&rdev->devlist_mtx); 847 #ifdef CONFIG_CFG80211_WEXT 848 wdev->wext.default_key = -1; 849 wdev->wext.default_mgmt_key = -1; 850 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 851 #endif 852 853 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 854 wdev->ps = true; 855 else 856 wdev->ps = false; 857 /* allow mac80211 to determine the timeout */ 858 wdev->ps_timeout = -1; 859 860 if (!dev->ethtool_ops) 861 dev->ethtool_ops = &cfg80211_ethtool_ops; 862 863 if ((wdev->iftype == NL80211_IFTYPE_STATION || 864 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 865 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 866 dev->priv_flags |= IFF_DONT_BRIDGE; 867 break; 868 case NETDEV_GOING_DOWN: 869 switch (wdev->iftype) { 870 case NL80211_IFTYPE_ADHOC: 871 cfg80211_leave_ibss(rdev, dev, true); 872 break; 873 case NL80211_IFTYPE_P2P_CLIENT: 874 case NL80211_IFTYPE_STATION: 875 mutex_lock(&rdev->sched_scan_mtx); 876 __cfg80211_stop_sched_scan(rdev, false); 877 mutex_unlock(&rdev->sched_scan_mtx); 878 879 wdev_lock(wdev); 880 #ifdef CONFIG_CFG80211_WEXT 881 kfree(wdev->wext.ie); 882 wdev->wext.ie = NULL; 883 wdev->wext.ie_len = 0; 884 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 885 #endif 886 __cfg80211_disconnect(rdev, dev, 887 WLAN_REASON_DEAUTH_LEAVING, true); 888 cfg80211_mlme_down(rdev, dev); 889 wdev_unlock(wdev); 890 break; 891 case NL80211_IFTYPE_MESH_POINT: 892 cfg80211_leave_mesh(rdev, dev); 893 break; 894 case NL80211_IFTYPE_AP: 895 cfg80211_stop_ap(rdev, dev); 896 break; 897 default: 898 break; 899 } 900 wdev->beacon_interval = 0; 901 break; 902 case NETDEV_DOWN: 903 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 904 dev_hold(dev); 905 queue_work(cfg80211_wq, &wdev->cleanup_work); 906 break; 907 case NETDEV_UP: 908 /* 909 * If we have a really quick DOWN/UP succession we may 910 * have this work still pending ... cancel it and see 911 * if it was pending, in which case we need to account 912 * for some of the work it would have done. 913 */ 914 if (cancel_work_sync(&wdev->cleanup_work)) { 915 mutex_lock(&rdev->devlist_mtx); 916 rdev->opencount--; 917 mutex_unlock(&rdev->devlist_mtx); 918 dev_put(dev); 919 } 920 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 921 cfg80211_lock_rdev(rdev); 922 mutex_lock(&rdev->devlist_mtx); 923 wdev_lock(wdev); 924 switch (wdev->iftype) { 925 #ifdef CONFIG_CFG80211_WEXT 926 case NL80211_IFTYPE_ADHOC: 927 cfg80211_ibss_wext_join(rdev, wdev); 928 break; 929 case NL80211_IFTYPE_STATION: 930 cfg80211_mgd_wext_connect(rdev, wdev); 931 break; 932 #endif 933 #ifdef CONFIG_MAC80211_MESH 934 case NL80211_IFTYPE_MESH_POINT: 935 { 936 /* backward compat code... */ 937 struct mesh_setup setup; 938 memcpy(&setup, &default_mesh_setup, 939 sizeof(setup)); 940 /* back compat only needed for mesh_id */ 941 setup.mesh_id = wdev->ssid; 942 setup.mesh_id_len = wdev->mesh_id_up_len; 943 if (wdev->mesh_id_up_len) 944 __cfg80211_join_mesh(rdev, dev, 945 &setup, 946 &default_mesh_config); 947 break; 948 } 949 #endif 950 default: 951 break; 952 } 953 wdev_unlock(wdev); 954 rdev->opencount++; 955 mutex_unlock(&rdev->devlist_mtx); 956 cfg80211_unlock_rdev(rdev); 957 958 /* 959 * Configure power management to the driver here so that its 960 * correctly set also after interface type changes etc. 961 */ 962 if ((wdev->iftype == NL80211_IFTYPE_STATION || 963 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 964 rdev->ops->set_power_mgmt) 965 if (rdev->ops->set_power_mgmt(wdev->wiphy, dev, 966 wdev->ps, 967 wdev->ps_timeout)) { 968 /* assume this means it's off */ 969 wdev->ps = false; 970 } 971 break; 972 case NETDEV_UNREGISTER: 973 /* 974 * NB: cannot take rdev->mtx here because this may be 975 * called within code protected by it when interfaces 976 * are removed with nl80211. 977 */ 978 mutex_lock(&rdev->devlist_mtx); 979 /* 980 * It is possible to get NETDEV_UNREGISTER 981 * multiple times. To detect that, check 982 * that the interface is still on the list 983 * of registered interfaces, and only then 984 * remove and clean it up. 985 */ 986 if (!list_empty(&wdev->list)) { 987 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 988 list_del_rcu(&wdev->list); 989 rdev->devlist_generation++; 990 cfg80211_mlme_purge_registrations(wdev); 991 #ifdef CONFIG_CFG80211_WEXT 992 kfree(wdev->wext.keys); 993 #endif 994 } 995 mutex_unlock(&rdev->devlist_mtx); 996 /* 997 * synchronise (so that we won't find this netdev 998 * from other code any more) and then clear the list 999 * head so that the above code can safely check for 1000 * !list_empty() to avoid double-cleanup. 1001 */ 1002 synchronize_rcu(); 1003 INIT_LIST_HEAD(&wdev->list); 1004 /* 1005 * Ensure that all events have been processed and 1006 * freed. 1007 */ 1008 cfg80211_process_wdev_events(wdev); 1009 break; 1010 case NETDEV_PRE_UP: 1011 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 1012 return notifier_from_errno(-EOPNOTSUPP); 1013 if (rfkill_blocked(rdev->rfkill)) 1014 return notifier_from_errno(-ERFKILL); 1015 mutex_lock(&rdev->devlist_mtx); 1016 ret = cfg80211_can_add_interface(rdev, wdev->iftype); 1017 mutex_unlock(&rdev->devlist_mtx); 1018 if (ret) 1019 return notifier_from_errno(ret); 1020 break; 1021 } 1022 1023 return NOTIFY_DONE; 1024 } 1025 1026 static struct notifier_block cfg80211_netdev_notifier = { 1027 .notifier_call = cfg80211_netdev_notifier_call, 1028 }; 1029 1030 static void __net_exit cfg80211_pernet_exit(struct net *net) 1031 { 1032 struct cfg80211_registered_device *rdev; 1033 1034 rtnl_lock(); 1035 mutex_lock(&cfg80211_mutex); 1036 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1037 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1038 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1039 } 1040 mutex_unlock(&cfg80211_mutex); 1041 rtnl_unlock(); 1042 } 1043 1044 static struct pernet_operations cfg80211_pernet_ops = { 1045 .exit = cfg80211_pernet_exit, 1046 }; 1047 1048 static int __init cfg80211_init(void) 1049 { 1050 int err; 1051 1052 err = register_pernet_device(&cfg80211_pernet_ops); 1053 if (err) 1054 goto out_fail_pernet; 1055 1056 err = wiphy_sysfs_init(); 1057 if (err) 1058 goto out_fail_sysfs; 1059 1060 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1061 if (err) 1062 goto out_fail_notifier; 1063 1064 err = nl80211_init(); 1065 if (err) 1066 goto out_fail_nl80211; 1067 1068 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1069 1070 err = regulatory_init(); 1071 if (err) 1072 goto out_fail_reg; 1073 1074 cfg80211_wq = create_singlethread_workqueue("cfg80211"); 1075 if (!cfg80211_wq) 1076 goto out_fail_wq; 1077 1078 return 0; 1079 1080 out_fail_wq: 1081 regulatory_exit(); 1082 out_fail_reg: 1083 debugfs_remove(ieee80211_debugfs_dir); 1084 out_fail_nl80211: 1085 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1086 out_fail_notifier: 1087 wiphy_sysfs_exit(); 1088 out_fail_sysfs: 1089 unregister_pernet_device(&cfg80211_pernet_ops); 1090 out_fail_pernet: 1091 return err; 1092 } 1093 subsys_initcall(cfg80211_init); 1094 1095 static void __exit cfg80211_exit(void) 1096 { 1097 debugfs_remove(ieee80211_debugfs_dir); 1098 nl80211_exit(); 1099 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1100 wiphy_sysfs_exit(); 1101 regulatory_exit(); 1102 unregister_pernet_device(&cfg80211_pernet_ops); 1103 destroy_workqueue(cfg80211_wq); 1104 } 1105 module_exit(cfg80211_exit); 1106