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 assert_cfg80211_lock(); 61 62 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 63 if (rdev->wiphy_idx == wiphy_idx) { 64 result = rdev; 65 break; 66 } 67 } 68 69 return result; 70 } 71 72 int get_wiphy_idx(struct wiphy *wiphy) 73 { 74 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 75 76 return rdev->wiphy_idx; 77 } 78 79 /* requires cfg80211_rdev_mutex to be held! */ 80 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx) 81 { 82 struct cfg80211_registered_device *rdev; 83 84 assert_cfg80211_lock(); 85 86 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx); 87 if (!rdev) 88 return NULL; 89 return &rdev->wiphy; 90 } 91 92 struct cfg80211_registered_device * 93 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) 94 { 95 struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV); 96 struct net_device *dev; 97 98 mutex_lock(&cfg80211_mutex); 99 dev = dev_get_by_index(net, ifindex); 100 if (!dev) 101 goto out; 102 if (dev->ieee80211_ptr) { 103 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy); 104 mutex_lock(&rdev->mtx); 105 } else 106 rdev = ERR_PTR(-ENODEV); 107 dev_put(dev); 108 out: 109 mutex_unlock(&cfg80211_mutex); 110 return rdev; 111 } 112 113 /* requires cfg80211_mutex to be held */ 114 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, 115 char *newname) 116 { 117 struct cfg80211_registered_device *rdev2; 118 int wiphy_idx, taken = -1, result, digits; 119 120 assert_cfg80211_lock(); 121 122 /* prohibit calling the thing phy%d when %d is not its number */ 123 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken); 124 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) { 125 /* count number of places needed to print wiphy_idx */ 126 digits = 1; 127 while (wiphy_idx /= 10) 128 digits++; 129 /* 130 * deny the name if it is phy<idx> where <idx> is printed 131 * without leading zeroes. taken == strlen(newname) here 132 */ 133 if (taken == strlen(PHY_NAME) + digits) 134 return -EINVAL; 135 } 136 137 138 /* Ignore nop renames */ 139 if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0) 140 return 0; 141 142 /* Ensure another device does not already have this name. */ 143 list_for_each_entry(rdev2, &cfg80211_rdev_list, list) 144 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0) 145 return -EINVAL; 146 147 result = device_rename(&rdev->wiphy.dev, newname); 148 if (result) 149 return result; 150 151 if (rdev->wiphy.debugfsdir && 152 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent, 153 rdev->wiphy.debugfsdir, 154 rdev->wiphy.debugfsdir->d_parent, 155 newname)) 156 pr_err("failed to rename debugfs dir to %s!\n", newname); 157 158 nl80211_notify_dev_rename(rdev); 159 160 return 0; 161 } 162 163 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, 164 struct net *net) 165 { 166 struct wireless_dev *wdev; 167 int err = 0; 168 169 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK)) 170 return -EOPNOTSUPP; 171 172 list_for_each_entry(wdev, &rdev->wdev_list, list) { 173 if (!wdev->netdev) 174 continue; 175 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 176 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); 177 if (err) 178 break; 179 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 180 } 181 182 if (err) { 183 /* failed -- clean up to old netns */ 184 net = wiphy_net(&rdev->wiphy); 185 186 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list, 187 list) { 188 if (!wdev->netdev) 189 continue; 190 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 191 err = dev_change_net_namespace(wdev->netdev, net, 192 "wlan%d"); 193 WARN_ON(err); 194 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 195 } 196 197 return err; 198 } 199 200 wiphy_net_set(&rdev->wiphy, net); 201 202 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev)); 203 WARN_ON(err); 204 205 return 0; 206 } 207 208 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data) 209 { 210 struct cfg80211_registered_device *rdev = data; 211 212 rdev_rfkill_poll(rdev); 213 } 214 215 static int cfg80211_rfkill_set_block(void *data, bool blocked) 216 { 217 struct cfg80211_registered_device *rdev = data; 218 struct wireless_dev *wdev; 219 220 if (!blocked) 221 return 0; 222 223 rtnl_lock(); 224 mutex_lock(&rdev->devlist_mtx); 225 226 list_for_each_entry(wdev, &rdev->wdev_list, list) { 227 if (wdev->netdev) { 228 dev_close(wdev->netdev); 229 continue; 230 } 231 /* otherwise, check iftype */ 232 switch (wdev->iftype) { 233 case NL80211_IFTYPE_P2P_DEVICE: 234 if (!wdev->p2p_started) 235 break; 236 rdev_stop_p2p_device(rdev, wdev); 237 wdev->p2p_started = false; 238 rdev->opencount--; 239 break; 240 default: 241 break; 242 } 243 } 244 245 mutex_unlock(&rdev->devlist_mtx); 246 rtnl_unlock(); 247 248 return 0; 249 } 250 251 static void cfg80211_rfkill_sync_work(struct work_struct *work) 252 { 253 struct cfg80211_registered_device *rdev; 254 255 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync); 256 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill)); 257 } 258 259 static void cfg80211_event_work(struct work_struct *work) 260 { 261 struct cfg80211_registered_device *rdev; 262 263 rdev = container_of(work, struct cfg80211_registered_device, 264 event_work); 265 266 rtnl_lock(); 267 cfg80211_lock_rdev(rdev); 268 269 cfg80211_process_rdev_events(rdev); 270 cfg80211_unlock_rdev(rdev); 271 rtnl_unlock(); 272 } 273 274 /* exported functions */ 275 276 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv) 277 { 278 static int wiphy_counter; 279 280 struct cfg80211_registered_device *rdev; 281 int alloc_size; 282 283 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 284 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 285 WARN_ON(ops->connect && !ops->disconnect); 286 WARN_ON(ops->join_ibss && !ops->leave_ibss); 287 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 288 WARN_ON(ops->add_station && !ops->del_station); 289 WARN_ON(ops->add_mpath && !ops->del_mpath); 290 WARN_ON(ops->join_mesh && !ops->leave_mesh); 291 292 alloc_size = sizeof(*rdev) + sizeof_priv; 293 294 rdev = kzalloc(alloc_size, GFP_KERNEL); 295 if (!rdev) 296 return NULL; 297 298 rdev->ops = ops; 299 300 mutex_lock(&cfg80211_mutex); 301 302 rdev->wiphy_idx = wiphy_counter++; 303 304 if (unlikely(rdev->wiphy_idx < 0)) { 305 wiphy_counter--; 306 mutex_unlock(&cfg80211_mutex); 307 /* ugh, wrapped! */ 308 kfree(rdev); 309 return NULL; 310 } 311 312 mutex_unlock(&cfg80211_mutex); 313 314 /* give it a proper name */ 315 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 316 317 mutex_init(&rdev->mtx); 318 mutex_init(&rdev->devlist_mtx); 319 mutex_init(&rdev->sched_scan_mtx); 320 INIT_LIST_HEAD(&rdev->wdev_list); 321 INIT_LIST_HEAD(&rdev->beacon_registrations); 322 spin_lock_init(&rdev->beacon_registrations_lock); 323 spin_lock_init(&rdev->bss_lock); 324 INIT_LIST_HEAD(&rdev->bss_list); 325 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 326 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results); 327 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 328 cfg80211_dfs_channels_update_work); 329 #ifdef CONFIG_CFG80211_WEXT 330 rdev->wiphy.wext = &cfg80211_wext_handler; 331 #endif 332 333 device_initialize(&rdev->wiphy.dev); 334 rdev->wiphy.dev.class = &ieee80211_class; 335 rdev->wiphy.dev.platform_data = rdev; 336 337 #ifdef CONFIG_CFG80211_DEFAULT_PS 338 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 339 #endif 340 341 wiphy_net_set(&rdev->wiphy, &init_net); 342 343 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 344 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 345 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 346 &rdev->rfkill_ops, rdev); 347 348 if (!rdev->rfkill) { 349 kfree(rdev); 350 return NULL; 351 } 352 353 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); 354 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 355 INIT_WORK(&rdev->event_work, cfg80211_event_work); 356 357 init_waitqueue_head(&rdev->dev_wait); 358 359 /* 360 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 361 * Fragmentation and RTS threshold are disabled by default with the 362 * special -1 value. 363 */ 364 rdev->wiphy.retry_short = 7; 365 rdev->wiphy.retry_long = 4; 366 rdev->wiphy.frag_threshold = (u32) -1; 367 rdev->wiphy.rts_threshold = (u32) -1; 368 rdev->wiphy.coverage_class = 0; 369 370 rdev->wiphy.features = NL80211_FEATURE_SCAN_FLUSH | 371 NL80211_FEATURE_ADVERTISE_CHAN_LIMITS; 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 /* 389 * Combinations with just one interface aren't real, 390 * however we make an exception for DFS. 391 */ 392 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 393 return -EINVAL; 394 395 /* Need at least one channel */ 396 if (WARN_ON(!c->num_different_channels)) 397 return -EINVAL; 398 399 /* 400 * Put a sane limit on maximum number of different 401 * channels to simplify channel accounting code. 402 */ 403 if (WARN_ON(c->num_different_channels > 404 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 405 return -EINVAL; 406 407 /* DFS only works on one channel. */ 408 if (WARN_ON(c->radar_detect_widths && 409 (c->num_different_channels > 1))) 410 return -EINVAL; 411 412 if (WARN_ON(!c->n_limits)) 413 return -EINVAL; 414 415 for (j = 0; j < c->n_limits; j++) { 416 u16 types = c->limits[j].types; 417 418 /* 419 * interface types shouldn't overlap, this is 420 * used in cfg80211_can_change_interface() 421 */ 422 if (WARN_ON(types & all_iftypes)) 423 return -EINVAL; 424 all_iftypes |= types; 425 426 if (WARN_ON(!c->limits[j].max)) 427 return -EINVAL; 428 429 /* Shouldn't list software iftypes in combinations! */ 430 if (WARN_ON(wiphy->software_iftypes & types)) 431 return -EINVAL; 432 433 /* Only a single P2P_DEVICE can be allowed */ 434 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 435 c->limits[j].max > 1)) 436 return -EINVAL; 437 438 cnt += c->limits[j].max; 439 /* 440 * Don't advertise an unsupported type 441 * in a combination. 442 */ 443 if (WARN_ON((wiphy->interface_modes & types) != types)) 444 return -EINVAL; 445 } 446 447 /* You can't even choose that many! */ 448 if (WARN_ON(cnt < c->max_interfaces)) 449 return -EINVAL; 450 } 451 452 return 0; 453 } 454 455 int wiphy_register(struct wiphy *wiphy) 456 { 457 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 458 int res; 459 enum ieee80211_band band; 460 struct ieee80211_supported_band *sband; 461 bool have_band = false; 462 int i; 463 u16 ifmodes = wiphy->interface_modes; 464 465 #ifdef CONFIG_PM 466 if (WARN_ON((wiphy->wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 467 !(wiphy->wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 468 return -EINVAL; 469 #endif 470 471 if (WARN_ON(wiphy->ap_sme_capa && 472 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 473 return -EINVAL; 474 475 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 476 return -EINVAL; 477 478 if (WARN_ON(wiphy->addresses && 479 !is_zero_ether_addr(wiphy->perm_addr) && 480 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 481 ETH_ALEN))) 482 return -EINVAL; 483 484 if (WARN_ON(wiphy->max_acl_mac_addrs && 485 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 486 !rdev->ops->set_mac_acl))) 487 return -EINVAL; 488 489 if (wiphy->addresses) 490 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 491 492 /* sanity check ifmodes */ 493 WARN_ON(!ifmodes); 494 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 495 if (WARN_ON(ifmodes != wiphy->interface_modes)) 496 wiphy->interface_modes = ifmodes; 497 498 res = wiphy_verify_combinations(wiphy); 499 if (res) 500 return res; 501 502 /* sanity check supported bands/channels */ 503 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 504 sband = wiphy->bands[band]; 505 if (!sband) 506 continue; 507 508 sband->band = band; 509 if (WARN_ON(!sband->n_channels)) 510 return -EINVAL; 511 /* 512 * on 60gHz band, there are no legacy rates, so 513 * n_bitrates is 0 514 */ 515 if (WARN_ON(band != IEEE80211_BAND_60GHZ && 516 !sband->n_bitrates)) 517 return -EINVAL; 518 519 /* 520 * Since cfg80211_disable_40mhz_24ghz is global, we can 521 * modify the sband's ht data even if the driver uses a 522 * global structure for that. 523 */ 524 if (cfg80211_disable_40mhz_24ghz && 525 band == IEEE80211_BAND_2GHZ && 526 sband->ht_cap.ht_supported) { 527 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 528 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 529 } 530 531 /* 532 * Since we use a u32 for rate bitmaps in 533 * ieee80211_get_response_rate, we cannot 534 * have more than 32 legacy rates. 535 */ 536 if (WARN_ON(sband->n_bitrates > 32)) 537 return -EINVAL; 538 539 for (i = 0; i < sband->n_channels; i++) { 540 sband->channels[i].orig_flags = 541 sband->channels[i].flags; 542 sband->channels[i].orig_mag = INT_MAX; 543 sband->channels[i].orig_mpwr = 544 sband->channels[i].max_power; 545 sband->channels[i].band = band; 546 } 547 548 have_band = true; 549 } 550 551 if (!have_band) { 552 WARN_ON(1); 553 return -EINVAL; 554 } 555 556 #ifdef CONFIG_PM 557 if (rdev->wiphy.wowlan.n_patterns) { 558 if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len || 559 rdev->wiphy.wowlan.pattern_min_len > 560 rdev->wiphy.wowlan.pattern_max_len)) 561 return -EINVAL; 562 } 563 #endif 564 565 /* check and set up bitrates */ 566 ieee80211_set_bitrate_flags(wiphy); 567 568 mutex_lock(&cfg80211_mutex); 569 570 res = device_add(&rdev->wiphy.dev); 571 if (res) { 572 mutex_unlock(&cfg80211_mutex); 573 return res; 574 } 575 576 /* set up regulatory info */ 577 wiphy_regulatory_register(wiphy); 578 579 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 580 cfg80211_rdev_list_generation++; 581 582 /* add to debugfs */ 583 rdev->wiphy.debugfsdir = 584 debugfs_create_dir(wiphy_name(&rdev->wiphy), 585 ieee80211_debugfs_dir); 586 if (IS_ERR(rdev->wiphy.debugfsdir)) 587 rdev->wiphy.debugfsdir = NULL; 588 589 if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { 590 struct regulatory_request request; 591 592 request.wiphy_idx = get_wiphy_idx(wiphy); 593 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 594 request.alpha2[0] = '9'; 595 request.alpha2[1] = '9'; 596 597 nl80211_send_reg_change_event(&request); 598 } 599 600 cfg80211_debugfs_rdev_add(rdev); 601 mutex_unlock(&cfg80211_mutex); 602 603 /* 604 * due to a locking dependency this has to be outside of the 605 * cfg80211_mutex lock 606 */ 607 res = rfkill_register(rdev->rfkill); 608 if (res) 609 goto out_rm_dev; 610 611 rtnl_lock(); 612 rdev->wiphy.registered = true; 613 rtnl_unlock(); 614 return 0; 615 616 out_rm_dev: 617 device_del(&rdev->wiphy.dev); 618 return res; 619 } 620 EXPORT_SYMBOL(wiphy_register); 621 622 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 623 { 624 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 625 626 if (!rdev->ops->rfkill_poll) 627 return; 628 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 629 rfkill_resume_polling(rdev->rfkill); 630 } 631 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 632 633 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 634 { 635 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 636 637 rfkill_pause_polling(rdev->rfkill); 638 } 639 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 640 641 void wiphy_unregister(struct wiphy *wiphy) 642 { 643 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 644 645 rtnl_lock(); 646 rdev->wiphy.registered = false; 647 rtnl_unlock(); 648 649 rfkill_unregister(rdev->rfkill); 650 651 /* protect the device list */ 652 mutex_lock(&cfg80211_mutex); 653 654 wait_event(rdev->dev_wait, ({ 655 int __count; 656 mutex_lock(&rdev->devlist_mtx); 657 __count = rdev->opencount; 658 mutex_unlock(&rdev->devlist_mtx); 659 __count == 0; })); 660 661 mutex_lock(&rdev->devlist_mtx); 662 BUG_ON(!list_empty(&rdev->wdev_list)); 663 mutex_unlock(&rdev->devlist_mtx); 664 665 /* 666 * First remove the hardware from everywhere, this makes 667 * it impossible to find from userspace. 668 */ 669 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 670 list_del_rcu(&rdev->list); 671 synchronize_rcu(); 672 673 /* 674 * Try to grab rdev->mtx. If a command is still in progress, 675 * hopefully the driver will refuse it since it's tearing 676 * down the device already. We wait for this command to complete 677 * before unlinking the item from the list. 678 * Note: as codified by the BUG_ON above we cannot get here if 679 * a virtual interface is still present. Hence, we can only get 680 * to lock contention here if userspace issues a command that 681 * identified the hardware by wiphy index. 682 */ 683 cfg80211_lock_rdev(rdev); 684 /* nothing */ 685 cfg80211_unlock_rdev(rdev); 686 687 /* 688 * If this device got a regulatory hint tell core its 689 * free to listen now to a new shiny device regulatory hint 690 */ 691 wiphy_regulatory_deregister(wiphy); 692 693 cfg80211_rdev_list_generation++; 694 device_del(&rdev->wiphy.dev); 695 696 mutex_unlock(&cfg80211_mutex); 697 698 flush_work(&rdev->scan_done_wk); 699 cancel_work_sync(&rdev->conn_work); 700 flush_work(&rdev->event_work); 701 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 702 703 if (rdev->wowlan && rdev->ops->set_wakeup) 704 rdev_set_wakeup(rdev, false); 705 cfg80211_rdev_free_wowlan(rdev); 706 } 707 EXPORT_SYMBOL(wiphy_unregister); 708 709 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 710 { 711 struct cfg80211_internal_bss *scan, *tmp; 712 struct cfg80211_beacon_registration *reg, *treg; 713 rfkill_destroy(rdev->rfkill); 714 mutex_destroy(&rdev->mtx); 715 mutex_destroy(&rdev->devlist_mtx); 716 mutex_destroy(&rdev->sched_scan_mtx); 717 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 718 list_del(®->list); 719 kfree(reg); 720 } 721 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 722 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 723 kfree(rdev); 724 } 725 726 void wiphy_free(struct wiphy *wiphy) 727 { 728 put_device(&wiphy->dev); 729 } 730 EXPORT_SYMBOL(wiphy_free); 731 732 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 733 { 734 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 735 736 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 737 schedule_work(&rdev->rfkill_sync); 738 } 739 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 740 741 static void wdev_cleanup_work(struct work_struct *work) 742 { 743 struct wireless_dev *wdev; 744 struct cfg80211_registered_device *rdev; 745 746 wdev = container_of(work, struct wireless_dev, cleanup_work); 747 rdev = wiphy_to_dev(wdev->wiphy); 748 749 cfg80211_lock_rdev(rdev); 750 751 if (WARN_ON(rdev->scan_req && rdev->scan_req->wdev == wdev)) { 752 rdev->scan_req->aborted = true; 753 ___cfg80211_scan_done(rdev, true); 754 } 755 756 cfg80211_unlock_rdev(rdev); 757 758 mutex_lock(&rdev->sched_scan_mtx); 759 760 if (WARN_ON(rdev->sched_scan_req && 761 rdev->sched_scan_req->dev == wdev->netdev)) { 762 __cfg80211_stop_sched_scan(rdev, false); 763 } 764 765 mutex_unlock(&rdev->sched_scan_mtx); 766 767 mutex_lock(&rdev->devlist_mtx); 768 rdev->opencount--; 769 mutex_unlock(&rdev->devlist_mtx); 770 wake_up(&rdev->dev_wait); 771 772 dev_put(wdev->netdev); 773 } 774 775 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 776 { 777 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy); 778 779 ASSERT_RTNL(); 780 781 if (WARN_ON(wdev->netdev)) 782 return; 783 784 mutex_lock(&rdev->devlist_mtx); 785 list_del_rcu(&wdev->list); 786 rdev->devlist_generation++; 787 788 switch (wdev->iftype) { 789 case NL80211_IFTYPE_P2P_DEVICE: 790 if (!wdev->p2p_started) 791 break; 792 rdev_stop_p2p_device(rdev, wdev); 793 wdev->p2p_started = false; 794 rdev->opencount--; 795 break; 796 default: 797 WARN_ON_ONCE(1); 798 break; 799 } 800 mutex_unlock(&rdev->devlist_mtx); 801 } 802 EXPORT_SYMBOL(cfg80211_unregister_wdev); 803 804 static struct device_type wiphy_type = { 805 .name = "wlan", 806 }; 807 808 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 809 enum nl80211_iftype iftype, int num) 810 { 811 ASSERT_RTNL(); 812 813 rdev->num_running_ifaces += num; 814 if (iftype == NL80211_IFTYPE_MONITOR) 815 rdev->num_running_monitor_ifaces += num; 816 } 817 818 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 819 unsigned long state, 820 void *ndev) 821 { 822 struct net_device *dev = ndev; 823 struct wireless_dev *wdev = dev->ieee80211_ptr; 824 struct cfg80211_registered_device *rdev; 825 int ret; 826 827 if (!wdev) 828 return NOTIFY_DONE; 829 830 rdev = wiphy_to_dev(wdev->wiphy); 831 832 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 833 834 switch (state) { 835 case NETDEV_POST_INIT: 836 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 837 break; 838 case NETDEV_REGISTER: 839 /* 840 * NB: cannot take rdev->mtx here because this may be 841 * called within code protected by it when interfaces 842 * are added with nl80211. 843 */ 844 mutex_init(&wdev->mtx); 845 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work); 846 INIT_LIST_HEAD(&wdev->event_list); 847 spin_lock_init(&wdev->event_lock); 848 INIT_LIST_HEAD(&wdev->mgmt_registrations); 849 spin_lock_init(&wdev->mgmt_registrations_lock); 850 851 mutex_lock(&rdev->devlist_mtx); 852 wdev->identifier = ++rdev->wdev_id; 853 list_add_rcu(&wdev->list, &rdev->wdev_list); 854 rdev->devlist_generation++; 855 /* can only change netns with wiphy */ 856 dev->features |= NETIF_F_NETNS_LOCAL; 857 858 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 859 "phy80211")) { 860 pr_err("failed to add phy80211 symlink to netdev!\n"); 861 } 862 wdev->netdev = dev; 863 wdev->sme_state = CFG80211_SME_IDLE; 864 mutex_unlock(&rdev->devlist_mtx); 865 #ifdef CONFIG_CFG80211_WEXT 866 wdev->wext.default_key = -1; 867 wdev->wext.default_mgmt_key = -1; 868 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 869 #endif 870 871 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 872 wdev->ps = true; 873 else 874 wdev->ps = false; 875 /* allow mac80211 to determine the timeout */ 876 wdev->ps_timeout = -1; 877 878 netdev_set_default_ethtool_ops(dev, &cfg80211_ethtool_ops); 879 880 if ((wdev->iftype == NL80211_IFTYPE_STATION || 881 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 882 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 883 dev->priv_flags |= IFF_DONT_BRIDGE; 884 break; 885 case NETDEV_GOING_DOWN: 886 switch (wdev->iftype) { 887 case NL80211_IFTYPE_ADHOC: 888 cfg80211_leave_ibss(rdev, dev, true); 889 break; 890 case NL80211_IFTYPE_P2P_CLIENT: 891 case NL80211_IFTYPE_STATION: 892 mutex_lock(&rdev->sched_scan_mtx); 893 __cfg80211_stop_sched_scan(rdev, false); 894 mutex_unlock(&rdev->sched_scan_mtx); 895 896 wdev_lock(wdev); 897 #ifdef CONFIG_CFG80211_WEXT 898 kfree(wdev->wext.ie); 899 wdev->wext.ie = NULL; 900 wdev->wext.ie_len = 0; 901 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 902 #endif 903 __cfg80211_disconnect(rdev, dev, 904 WLAN_REASON_DEAUTH_LEAVING, true); 905 cfg80211_mlme_down(rdev, dev); 906 wdev_unlock(wdev); 907 break; 908 case NL80211_IFTYPE_MESH_POINT: 909 cfg80211_leave_mesh(rdev, dev); 910 break; 911 case NL80211_IFTYPE_AP: 912 cfg80211_stop_ap(rdev, dev); 913 break; 914 default: 915 break; 916 } 917 wdev->beacon_interval = 0; 918 break; 919 case NETDEV_DOWN: 920 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 921 dev_hold(dev); 922 queue_work(cfg80211_wq, &wdev->cleanup_work); 923 break; 924 case NETDEV_UP: 925 /* 926 * If we have a really quick DOWN/UP succession we may 927 * have this work still pending ... cancel it and see 928 * if it was pending, in which case we need to account 929 * for some of the work it would have done. 930 */ 931 if (cancel_work_sync(&wdev->cleanup_work)) { 932 mutex_lock(&rdev->devlist_mtx); 933 rdev->opencount--; 934 mutex_unlock(&rdev->devlist_mtx); 935 dev_put(dev); 936 } 937 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 938 cfg80211_lock_rdev(rdev); 939 mutex_lock(&rdev->devlist_mtx); 940 wdev_lock(wdev); 941 switch (wdev->iftype) { 942 #ifdef CONFIG_CFG80211_WEXT 943 case NL80211_IFTYPE_ADHOC: 944 cfg80211_ibss_wext_join(rdev, wdev); 945 break; 946 case NL80211_IFTYPE_STATION: 947 cfg80211_mgd_wext_connect(rdev, wdev); 948 break; 949 #endif 950 #ifdef CONFIG_MAC80211_MESH 951 case NL80211_IFTYPE_MESH_POINT: 952 { 953 /* backward compat code... */ 954 struct mesh_setup setup; 955 memcpy(&setup, &default_mesh_setup, 956 sizeof(setup)); 957 /* back compat only needed for mesh_id */ 958 setup.mesh_id = wdev->ssid; 959 setup.mesh_id_len = wdev->mesh_id_up_len; 960 if (wdev->mesh_id_up_len) 961 __cfg80211_join_mesh(rdev, dev, 962 &setup, 963 &default_mesh_config); 964 break; 965 } 966 #endif 967 default: 968 break; 969 } 970 wdev_unlock(wdev); 971 rdev->opencount++; 972 mutex_unlock(&rdev->devlist_mtx); 973 cfg80211_unlock_rdev(rdev); 974 975 /* 976 * Configure power management to the driver here so that its 977 * correctly set also after interface type changes etc. 978 */ 979 if ((wdev->iftype == NL80211_IFTYPE_STATION || 980 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 981 rdev->ops->set_power_mgmt) 982 if (rdev_set_power_mgmt(rdev, dev, wdev->ps, 983 wdev->ps_timeout)) { 984 /* assume this means it's off */ 985 wdev->ps = false; 986 } 987 break; 988 case NETDEV_UNREGISTER: 989 /* 990 * NB: cannot take rdev->mtx here because this may be 991 * called within code protected by it when interfaces 992 * are removed with nl80211. 993 */ 994 mutex_lock(&rdev->devlist_mtx); 995 /* 996 * It is possible to get NETDEV_UNREGISTER 997 * multiple times. To detect that, check 998 * that the interface is still on the list 999 * of registered interfaces, and only then 1000 * remove and clean it up. 1001 */ 1002 if (!list_empty(&wdev->list)) { 1003 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 1004 list_del_rcu(&wdev->list); 1005 rdev->devlist_generation++; 1006 cfg80211_mlme_purge_registrations(wdev); 1007 #ifdef CONFIG_CFG80211_WEXT 1008 kfree(wdev->wext.keys); 1009 #endif 1010 } 1011 mutex_unlock(&rdev->devlist_mtx); 1012 /* 1013 * synchronise (so that we won't find this netdev 1014 * from other code any more) and then clear the list 1015 * head so that the above code can safely check for 1016 * !list_empty() to avoid double-cleanup. 1017 */ 1018 synchronize_rcu(); 1019 INIT_LIST_HEAD(&wdev->list); 1020 /* 1021 * Ensure that all events have been processed and 1022 * freed. 1023 */ 1024 cfg80211_process_wdev_events(wdev); 1025 break; 1026 case NETDEV_PRE_UP: 1027 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 1028 return notifier_from_errno(-EOPNOTSUPP); 1029 if (rfkill_blocked(rdev->rfkill)) 1030 return notifier_from_errno(-ERFKILL); 1031 mutex_lock(&rdev->devlist_mtx); 1032 ret = cfg80211_can_add_interface(rdev, wdev->iftype); 1033 mutex_unlock(&rdev->devlist_mtx); 1034 if (ret) 1035 return notifier_from_errno(ret); 1036 break; 1037 } 1038 1039 return NOTIFY_DONE; 1040 } 1041 1042 static struct notifier_block cfg80211_netdev_notifier = { 1043 .notifier_call = cfg80211_netdev_notifier_call, 1044 }; 1045 1046 static void __net_exit cfg80211_pernet_exit(struct net *net) 1047 { 1048 struct cfg80211_registered_device *rdev; 1049 1050 rtnl_lock(); 1051 mutex_lock(&cfg80211_mutex); 1052 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1053 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1054 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1055 } 1056 mutex_unlock(&cfg80211_mutex); 1057 rtnl_unlock(); 1058 } 1059 1060 static struct pernet_operations cfg80211_pernet_ops = { 1061 .exit = cfg80211_pernet_exit, 1062 }; 1063 1064 static int __init cfg80211_init(void) 1065 { 1066 int err; 1067 1068 err = register_pernet_device(&cfg80211_pernet_ops); 1069 if (err) 1070 goto out_fail_pernet; 1071 1072 err = wiphy_sysfs_init(); 1073 if (err) 1074 goto out_fail_sysfs; 1075 1076 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1077 if (err) 1078 goto out_fail_notifier; 1079 1080 err = nl80211_init(); 1081 if (err) 1082 goto out_fail_nl80211; 1083 1084 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1085 1086 err = regulatory_init(); 1087 if (err) 1088 goto out_fail_reg; 1089 1090 cfg80211_wq = create_singlethread_workqueue("cfg80211"); 1091 if (!cfg80211_wq) 1092 goto out_fail_wq; 1093 1094 return 0; 1095 1096 out_fail_wq: 1097 regulatory_exit(); 1098 out_fail_reg: 1099 debugfs_remove(ieee80211_debugfs_dir); 1100 out_fail_nl80211: 1101 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1102 out_fail_notifier: 1103 wiphy_sysfs_exit(); 1104 out_fail_sysfs: 1105 unregister_pernet_device(&cfg80211_pernet_ops); 1106 out_fail_pernet: 1107 return err; 1108 } 1109 subsys_initcall(cfg80211_init); 1110 1111 static void __exit cfg80211_exit(void) 1112 { 1113 debugfs_remove(ieee80211_debugfs_dir); 1114 nl80211_exit(); 1115 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1116 wiphy_sysfs_exit(); 1117 regulatory_exit(); 1118 unregister_pernet_device(&cfg80211_pernet_ops); 1119 destroy_workqueue(cfg80211_wq); 1120 } 1121 module_exit(cfg80211_exit); 1122