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; 371 372 return &rdev->wiphy; 373 } 374 EXPORT_SYMBOL(wiphy_new); 375 376 static int wiphy_verify_combinations(struct wiphy *wiphy) 377 { 378 const struct ieee80211_iface_combination *c; 379 int i, j; 380 381 for (i = 0; i < wiphy->n_iface_combinations; i++) { 382 u32 cnt = 0; 383 u16 all_iftypes = 0; 384 385 c = &wiphy->iface_combinations[i]; 386 387 /* 388 * Combinations with just one interface aren't real, 389 * however we make an exception for DFS. 390 */ 391 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 392 return -EINVAL; 393 394 /* Need at least one channel */ 395 if (WARN_ON(!c->num_different_channels)) 396 return -EINVAL; 397 398 /* 399 * Put a sane limit on maximum number of different 400 * channels to simplify channel accounting code. 401 */ 402 if (WARN_ON(c->num_different_channels > 403 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 404 return -EINVAL; 405 406 /* DFS only works on one channel. */ 407 if (WARN_ON(c->radar_detect_widths && 408 (c->num_different_channels > 1))) 409 return -EINVAL; 410 411 if (WARN_ON(!c->n_limits)) 412 return -EINVAL; 413 414 for (j = 0; j < c->n_limits; j++) { 415 u16 types = c->limits[j].types; 416 417 /* 418 * interface types shouldn't overlap, this is 419 * used in cfg80211_can_change_interface() 420 */ 421 if (WARN_ON(types & all_iftypes)) 422 return -EINVAL; 423 all_iftypes |= types; 424 425 if (WARN_ON(!c->limits[j].max)) 426 return -EINVAL; 427 428 /* Shouldn't list software iftypes in combinations! */ 429 if (WARN_ON(wiphy->software_iftypes & types)) 430 return -EINVAL; 431 432 /* Only a single P2P_DEVICE can be allowed */ 433 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 434 c->limits[j].max > 1)) 435 return -EINVAL; 436 437 cnt += c->limits[j].max; 438 /* 439 * Don't advertise an unsupported type 440 * in a combination. 441 */ 442 if (WARN_ON((wiphy->interface_modes & types) != types)) 443 return -EINVAL; 444 } 445 446 /* You can't even choose that many! */ 447 if (WARN_ON(cnt < c->max_interfaces)) 448 return -EINVAL; 449 } 450 451 return 0; 452 } 453 454 int wiphy_register(struct wiphy *wiphy) 455 { 456 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 457 int res; 458 enum ieee80211_band band; 459 struct ieee80211_supported_band *sband; 460 bool have_band = false; 461 int i; 462 u16 ifmodes = wiphy->interface_modes; 463 464 #ifdef CONFIG_PM 465 if (WARN_ON((wiphy->wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 466 !(wiphy->wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 467 return -EINVAL; 468 #endif 469 470 if (WARN_ON(wiphy->ap_sme_capa && 471 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 472 return -EINVAL; 473 474 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 475 return -EINVAL; 476 477 if (WARN_ON(wiphy->addresses && 478 !is_zero_ether_addr(wiphy->perm_addr) && 479 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 480 ETH_ALEN))) 481 return -EINVAL; 482 483 if (WARN_ON(wiphy->max_acl_mac_addrs && 484 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 485 !rdev->ops->set_mac_acl))) 486 return -EINVAL; 487 488 if (wiphy->addresses) 489 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 490 491 /* sanity check ifmodes */ 492 WARN_ON(!ifmodes); 493 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 494 if (WARN_ON(ifmodes != wiphy->interface_modes)) 495 wiphy->interface_modes = ifmodes; 496 497 res = wiphy_verify_combinations(wiphy); 498 if (res) 499 return res; 500 501 /* sanity check supported bands/channels */ 502 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 503 sband = wiphy->bands[band]; 504 if (!sband) 505 continue; 506 507 sband->band = band; 508 if (WARN_ON(!sband->n_channels)) 509 return -EINVAL; 510 /* 511 * on 60gHz band, there are no legacy rates, so 512 * n_bitrates is 0 513 */ 514 if (WARN_ON(band != IEEE80211_BAND_60GHZ && 515 !sband->n_bitrates)) 516 return -EINVAL; 517 518 /* 519 * Since cfg80211_disable_40mhz_24ghz is global, we can 520 * modify the sband's ht data even if the driver uses a 521 * global structure for that. 522 */ 523 if (cfg80211_disable_40mhz_24ghz && 524 band == IEEE80211_BAND_2GHZ && 525 sband->ht_cap.ht_supported) { 526 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 527 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 528 } 529 530 /* 531 * Since we use a u32 for rate bitmaps in 532 * ieee80211_get_response_rate, we cannot 533 * have more than 32 legacy rates. 534 */ 535 if (WARN_ON(sband->n_bitrates > 32)) 536 return -EINVAL; 537 538 for (i = 0; i < sband->n_channels; i++) { 539 sband->channels[i].orig_flags = 540 sband->channels[i].flags; 541 sband->channels[i].orig_mag = INT_MAX; 542 sband->channels[i].orig_mpwr = 543 sband->channels[i].max_power; 544 sband->channels[i].band = band; 545 } 546 547 have_band = true; 548 } 549 550 if (!have_band) { 551 WARN_ON(1); 552 return -EINVAL; 553 } 554 555 #ifdef CONFIG_PM 556 if (rdev->wiphy.wowlan.n_patterns) { 557 if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len || 558 rdev->wiphy.wowlan.pattern_min_len > 559 rdev->wiphy.wowlan.pattern_max_len)) 560 return -EINVAL; 561 } 562 #endif 563 564 /* check and set up bitrates */ 565 ieee80211_set_bitrate_flags(wiphy); 566 567 mutex_lock(&cfg80211_mutex); 568 569 res = device_add(&rdev->wiphy.dev); 570 if (res) { 571 mutex_unlock(&cfg80211_mutex); 572 return res; 573 } 574 575 /* set up regulatory info */ 576 wiphy_regulatory_register(wiphy); 577 578 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 579 cfg80211_rdev_list_generation++; 580 581 /* add to debugfs */ 582 rdev->wiphy.debugfsdir = 583 debugfs_create_dir(wiphy_name(&rdev->wiphy), 584 ieee80211_debugfs_dir); 585 if (IS_ERR(rdev->wiphy.debugfsdir)) 586 rdev->wiphy.debugfsdir = NULL; 587 588 if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { 589 struct regulatory_request request; 590 591 request.wiphy_idx = get_wiphy_idx(wiphy); 592 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 593 request.alpha2[0] = '9'; 594 request.alpha2[1] = '9'; 595 596 nl80211_send_reg_change_event(&request); 597 } 598 599 cfg80211_debugfs_rdev_add(rdev); 600 mutex_unlock(&cfg80211_mutex); 601 602 /* 603 * due to a locking dependency this has to be outside of the 604 * cfg80211_mutex lock 605 */ 606 res = rfkill_register(rdev->rfkill); 607 if (res) 608 goto out_rm_dev; 609 610 rtnl_lock(); 611 rdev->wiphy.registered = true; 612 rtnl_unlock(); 613 return 0; 614 615 out_rm_dev: 616 device_del(&rdev->wiphy.dev); 617 return res; 618 } 619 EXPORT_SYMBOL(wiphy_register); 620 621 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 622 { 623 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 624 625 if (!rdev->ops->rfkill_poll) 626 return; 627 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 628 rfkill_resume_polling(rdev->rfkill); 629 } 630 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 631 632 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 633 { 634 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 635 636 rfkill_pause_polling(rdev->rfkill); 637 } 638 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 639 640 void wiphy_unregister(struct wiphy *wiphy) 641 { 642 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 643 644 rtnl_lock(); 645 rdev->wiphy.registered = false; 646 rtnl_unlock(); 647 648 rfkill_unregister(rdev->rfkill); 649 650 /* protect the device list */ 651 mutex_lock(&cfg80211_mutex); 652 653 wait_event(rdev->dev_wait, ({ 654 int __count; 655 mutex_lock(&rdev->devlist_mtx); 656 __count = rdev->opencount; 657 mutex_unlock(&rdev->devlist_mtx); 658 __count == 0; })); 659 660 mutex_lock(&rdev->devlist_mtx); 661 BUG_ON(!list_empty(&rdev->wdev_list)); 662 mutex_unlock(&rdev->devlist_mtx); 663 664 /* 665 * First remove the hardware from everywhere, this makes 666 * it impossible to find from userspace. 667 */ 668 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 669 list_del_rcu(&rdev->list); 670 synchronize_rcu(); 671 672 /* 673 * Try to grab rdev->mtx. If a command is still in progress, 674 * hopefully the driver will refuse it since it's tearing 675 * down the device already. We wait for this command to complete 676 * before unlinking the item from the list. 677 * Note: as codified by the BUG_ON above we cannot get here if 678 * a virtual interface is still present. Hence, we can only get 679 * to lock contention here if userspace issues a command that 680 * identified the hardware by wiphy index. 681 */ 682 cfg80211_lock_rdev(rdev); 683 /* nothing */ 684 cfg80211_unlock_rdev(rdev); 685 686 /* 687 * If this device got a regulatory hint tell core its 688 * free to listen now to a new shiny device regulatory hint 689 */ 690 wiphy_regulatory_deregister(wiphy); 691 692 cfg80211_rdev_list_generation++; 693 device_del(&rdev->wiphy.dev); 694 695 mutex_unlock(&cfg80211_mutex); 696 697 flush_work(&rdev->scan_done_wk); 698 cancel_work_sync(&rdev->conn_work); 699 flush_work(&rdev->event_work); 700 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 701 702 if (rdev->wowlan && rdev->ops->set_wakeup) 703 rdev_set_wakeup(rdev, false); 704 cfg80211_rdev_free_wowlan(rdev); 705 } 706 EXPORT_SYMBOL(wiphy_unregister); 707 708 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 709 { 710 struct cfg80211_internal_bss *scan, *tmp; 711 struct cfg80211_beacon_registration *reg, *treg; 712 rfkill_destroy(rdev->rfkill); 713 mutex_destroy(&rdev->mtx); 714 mutex_destroy(&rdev->devlist_mtx); 715 mutex_destroy(&rdev->sched_scan_mtx); 716 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 717 list_del(®->list); 718 kfree(reg); 719 } 720 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 721 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 722 kfree(rdev); 723 } 724 725 void wiphy_free(struct wiphy *wiphy) 726 { 727 put_device(&wiphy->dev); 728 } 729 EXPORT_SYMBOL(wiphy_free); 730 731 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 732 { 733 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 734 735 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 736 schedule_work(&rdev->rfkill_sync); 737 } 738 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 739 740 static void wdev_cleanup_work(struct work_struct *work) 741 { 742 struct wireless_dev *wdev; 743 struct cfg80211_registered_device *rdev; 744 745 wdev = container_of(work, struct wireless_dev, cleanup_work); 746 rdev = wiphy_to_dev(wdev->wiphy); 747 748 cfg80211_lock_rdev(rdev); 749 750 if (WARN_ON(rdev->scan_req && rdev->scan_req->wdev == wdev)) { 751 rdev->scan_req->aborted = true; 752 ___cfg80211_scan_done(rdev, true); 753 } 754 755 cfg80211_unlock_rdev(rdev); 756 757 mutex_lock(&rdev->sched_scan_mtx); 758 759 if (WARN_ON(rdev->sched_scan_req && 760 rdev->sched_scan_req->dev == wdev->netdev)) { 761 __cfg80211_stop_sched_scan(rdev, false); 762 } 763 764 mutex_unlock(&rdev->sched_scan_mtx); 765 766 mutex_lock(&rdev->devlist_mtx); 767 rdev->opencount--; 768 mutex_unlock(&rdev->devlist_mtx); 769 wake_up(&rdev->dev_wait); 770 771 dev_put(wdev->netdev); 772 } 773 774 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 775 { 776 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy); 777 778 ASSERT_RTNL(); 779 780 if (WARN_ON(wdev->netdev)) 781 return; 782 783 mutex_lock(&rdev->devlist_mtx); 784 list_del_rcu(&wdev->list); 785 rdev->devlist_generation++; 786 787 switch (wdev->iftype) { 788 case NL80211_IFTYPE_P2P_DEVICE: 789 if (!wdev->p2p_started) 790 break; 791 rdev_stop_p2p_device(rdev, wdev); 792 wdev->p2p_started = false; 793 rdev->opencount--; 794 break; 795 default: 796 WARN_ON_ONCE(1); 797 break; 798 } 799 mutex_unlock(&rdev->devlist_mtx); 800 } 801 EXPORT_SYMBOL(cfg80211_unregister_wdev); 802 803 static struct device_type wiphy_type = { 804 .name = "wlan", 805 }; 806 807 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 808 enum nl80211_iftype iftype, int num) 809 { 810 ASSERT_RTNL(); 811 812 rdev->num_running_ifaces += num; 813 if (iftype == NL80211_IFTYPE_MONITOR) 814 rdev->num_running_monitor_ifaces += num; 815 } 816 817 void cfg80211_leave(struct cfg80211_registered_device *rdev, 818 struct wireless_dev *wdev) 819 { 820 struct net_device *dev = wdev->netdev; 821 822 switch (wdev->iftype) { 823 case NL80211_IFTYPE_ADHOC: 824 cfg80211_leave_ibss(rdev, dev, true); 825 break; 826 case NL80211_IFTYPE_P2P_CLIENT: 827 case NL80211_IFTYPE_STATION: 828 mutex_lock(&rdev->sched_scan_mtx); 829 __cfg80211_stop_sched_scan(rdev, false); 830 mutex_unlock(&rdev->sched_scan_mtx); 831 832 wdev_lock(wdev); 833 #ifdef CONFIG_CFG80211_WEXT 834 kfree(wdev->wext.ie); 835 wdev->wext.ie = NULL; 836 wdev->wext.ie_len = 0; 837 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 838 #endif 839 __cfg80211_disconnect(rdev, dev, 840 WLAN_REASON_DEAUTH_LEAVING, true); 841 cfg80211_mlme_down(rdev, dev); 842 wdev_unlock(wdev); 843 break; 844 case NL80211_IFTYPE_MESH_POINT: 845 cfg80211_leave_mesh(rdev, dev); 846 break; 847 case NL80211_IFTYPE_AP: 848 cfg80211_stop_ap(rdev, dev); 849 break; 850 default: 851 break; 852 } 853 854 wdev->beacon_interval = 0; 855 } 856 857 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 858 unsigned long state, 859 void *ndev) 860 { 861 struct net_device *dev = ndev; 862 struct wireless_dev *wdev = dev->ieee80211_ptr; 863 struct cfg80211_registered_device *rdev; 864 int ret; 865 866 if (!wdev) 867 return NOTIFY_DONE; 868 869 rdev = wiphy_to_dev(wdev->wiphy); 870 871 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 872 873 switch (state) { 874 case NETDEV_POST_INIT: 875 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 876 break; 877 case NETDEV_REGISTER: 878 /* 879 * NB: cannot take rdev->mtx here because this may be 880 * called within code protected by it when interfaces 881 * are added with nl80211. 882 */ 883 mutex_init(&wdev->mtx); 884 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work); 885 INIT_LIST_HEAD(&wdev->event_list); 886 spin_lock_init(&wdev->event_lock); 887 INIT_LIST_HEAD(&wdev->mgmt_registrations); 888 spin_lock_init(&wdev->mgmt_registrations_lock); 889 890 mutex_lock(&rdev->devlist_mtx); 891 wdev->identifier = ++rdev->wdev_id; 892 list_add_rcu(&wdev->list, &rdev->wdev_list); 893 rdev->devlist_generation++; 894 /* can only change netns with wiphy */ 895 dev->features |= NETIF_F_NETNS_LOCAL; 896 897 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 898 "phy80211")) { 899 pr_err("failed to add phy80211 symlink to netdev!\n"); 900 } 901 wdev->netdev = dev; 902 wdev->sme_state = CFG80211_SME_IDLE; 903 mutex_unlock(&rdev->devlist_mtx); 904 #ifdef CONFIG_CFG80211_WEXT 905 wdev->wext.default_key = -1; 906 wdev->wext.default_mgmt_key = -1; 907 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 908 #endif 909 910 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 911 wdev->ps = true; 912 else 913 wdev->ps = false; 914 /* allow mac80211 to determine the timeout */ 915 wdev->ps_timeout = -1; 916 917 netdev_set_default_ethtool_ops(dev, &cfg80211_ethtool_ops); 918 919 if ((wdev->iftype == NL80211_IFTYPE_STATION || 920 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 921 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 922 dev->priv_flags |= IFF_DONT_BRIDGE; 923 break; 924 case NETDEV_GOING_DOWN: 925 cfg80211_leave(rdev, wdev); 926 break; 927 case NETDEV_DOWN: 928 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 929 dev_hold(dev); 930 queue_work(cfg80211_wq, &wdev->cleanup_work); 931 break; 932 case NETDEV_UP: 933 /* 934 * If we have a really quick DOWN/UP succession we may 935 * have this work still pending ... cancel it and see 936 * if it was pending, in which case we need to account 937 * for some of the work it would have done. 938 */ 939 if (cancel_work_sync(&wdev->cleanup_work)) { 940 mutex_lock(&rdev->devlist_mtx); 941 rdev->opencount--; 942 mutex_unlock(&rdev->devlist_mtx); 943 dev_put(dev); 944 } 945 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 946 cfg80211_lock_rdev(rdev); 947 mutex_lock(&rdev->devlist_mtx); 948 wdev_lock(wdev); 949 switch (wdev->iftype) { 950 #ifdef CONFIG_CFG80211_WEXT 951 case NL80211_IFTYPE_ADHOC: 952 cfg80211_ibss_wext_join(rdev, wdev); 953 break; 954 case NL80211_IFTYPE_STATION: 955 cfg80211_mgd_wext_connect(rdev, wdev); 956 break; 957 #endif 958 #ifdef CONFIG_MAC80211_MESH 959 case NL80211_IFTYPE_MESH_POINT: 960 { 961 /* backward compat code... */ 962 struct mesh_setup setup; 963 memcpy(&setup, &default_mesh_setup, 964 sizeof(setup)); 965 /* back compat only needed for mesh_id */ 966 setup.mesh_id = wdev->ssid; 967 setup.mesh_id_len = wdev->mesh_id_up_len; 968 if (wdev->mesh_id_up_len) 969 __cfg80211_join_mesh(rdev, dev, 970 &setup, 971 &default_mesh_config); 972 break; 973 } 974 #endif 975 default: 976 break; 977 } 978 wdev_unlock(wdev); 979 rdev->opencount++; 980 mutex_unlock(&rdev->devlist_mtx); 981 cfg80211_unlock_rdev(rdev); 982 983 /* 984 * Configure power management to the driver here so that its 985 * correctly set also after interface type changes etc. 986 */ 987 if ((wdev->iftype == NL80211_IFTYPE_STATION || 988 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 989 rdev->ops->set_power_mgmt) 990 if (rdev_set_power_mgmt(rdev, dev, wdev->ps, 991 wdev->ps_timeout)) { 992 /* assume this means it's off */ 993 wdev->ps = false; 994 } 995 break; 996 case NETDEV_UNREGISTER: 997 /* 998 * NB: cannot take rdev->mtx here because this may be 999 * called within code protected by it when interfaces 1000 * are removed with nl80211. 1001 */ 1002 mutex_lock(&rdev->devlist_mtx); 1003 /* 1004 * It is possible to get NETDEV_UNREGISTER 1005 * multiple times. To detect that, check 1006 * that the interface is still on the list 1007 * of registered interfaces, and only then 1008 * remove and clean it up. 1009 */ 1010 if (!list_empty(&wdev->list)) { 1011 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 1012 list_del_rcu(&wdev->list); 1013 rdev->devlist_generation++; 1014 cfg80211_mlme_purge_registrations(wdev); 1015 #ifdef CONFIG_CFG80211_WEXT 1016 kfree(wdev->wext.keys); 1017 #endif 1018 } 1019 mutex_unlock(&rdev->devlist_mtx); 1020 /* 1021 * synchronise (so that we won't find this netdev 1022 * from other code any more) and then clear the list 1023 * head so that the above code can safely check for 1024 * !list_empty() to avoid double-cleanup. 1025 */ 1026 synchronize_rcu(); 1027 INIT_LIST_HEAD(&wdev->list); 1028 /* 1029 * Ensure that all events have been processed and 1030 * freed. 1031 */ 1032 cfg80211_process_wdev_events(wdev); 1033 break; 1034 case NETDEV_PRE_UP: 1035 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 1036 return notifier_from_errno(-EOPNOTSUPP); 1037 if (rfkill_blocked(rdev->rfkill)) 1038 return notifier_from_errno(-ERFKILL); 1039 mutex_lock(&rdev->devlist_mtx); 1040 ret = cfg80211_can_add_interface(rdev, wdev->iftype); 1041 mutex_unlock(&rdev->devlist_mtx); 1042 if (ret) 1043 return notifier_from_errno(ret); 1044 break; 1045 } 1046 1047 return NOTIFY_DONE; 1048 } 1049 1050 static struct notifier_block cfg80211_netdev_notifier = { 1051 .notifier_call = cfg80211_netdev_notifier_call, 1052 }; 1053 1054 static void __net_exit cfg80211_pernet_exit(struct net *net) 1055 { 1056 struct cfg80211_registered_device *rdev; 1057 1058 rtnl_lock(); 1059 mutex_lock(&cfg80211_mutex); 1060 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1061 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1062 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1063 } 1064 mutex_unlock(&cfg80211_mutex); 1065 rtnl_unlock(); 1066 } 1067 1068 static struct pernet_operations cfg80211_pernet_ops = { 1069 .exit = cfg80211_pernet_exit, 1070 }; 1071 1072 static int __init cfg80211_init(void) 1073 { 1074 int err; 1075 1076 err = register_pernet_device(&cfg80211_pernet_ops); 1077 if (err) 1078 goto out_fail_pernet; 1079 1080 err = wiphy_sysfs_init(); 1081 if (err) 1082 goto out_fail_sysfs; 1083 1084 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1085 if (err) 1086 goto out_fail_notifier; 1087 1088 err = nl80211_init(); 1089 if (err) 1090 goto out_fail_nl80211; 1091 1092 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1093 1094 err = regulatory_init(); 1095 if (err) 1096 goto out_fail_reg; 1097 1098 cfg80211_wq = create_singlethread_workqueue("cfg80211"); 1099 if (!cfg80211_wq) 1100 goto out_fail_wq; 1101 1102 return 0; 1103 1104 out_fail_wq: 1105 regulatory_exit(); 1106 out_fail_reg: 1107 debugfs_remove(ieee80211_debugfs_dir); 1108 out_fail_nl80211: 1109 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1110 out_fail_notifier: 1111 wiphy_sysfs_exit(); 1112 out_fail_sysfs: 1113 unregister_pernet_device(&cfg80211_pernet_ops); 1114 out_fail_pernet: 1115 return err; 1116 } 1117 subsys_initcall(cfg80211_init); 1118 1119 static void __exit cfg80211_exit(void) 1120 { 1121 debugfs_remove(ieee80211_debugfs_dir); 1122 nl80211_exit(); 1123 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1124 wiphy_sysfs_exit(); 1125 regulatory_exit(); 1126 unregister_pernet_device(&cfg80211_pernet_ops); 1127 destroy_workqueue(cfg80211_wq); 1128 } 1129 module_exit(cfg80211_exit); 1130