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 /* requires cfg80211_mutex to be held! */ 100 struct cfg80211_registered_device * 101 __cfg80211_rdev_from_info(struct genl_info *info) 102 { 103 int ifindex; 104 struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL; 105 struct net_device *dev; 106 int err = -EINVAL; 107 108 assert_cfg80211_lock(); 109 110 if (info->attrs[NL80211_ATTR_WIPHY]) { 111 bywiphyidx = cfg80211_rdev_by_wiphy_idx( 112 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY])); 113 err = -ENODEV; 114 } 115 116 if (info->attrs[NL80211_ATTR_IFINDEX]) { 117 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]); 118 dev = dev_get_by_index(genl_info_net(info), ifindex); 119 if (dev) { 120 if (dev->ieee80211_ptr) 121 byifidx = 122 wiphy_to_dev(dev->ieee80211_ptr->wiphy); 123 dev_put(dev); 124 } 125 err = -ENODEV; 126 } 127 128 if (bywiphyidx && byifidx) { 129 if (bywiphyidx != byifidx) 130 return ERR_PTR(-EINVAL); 131 else 132 return bywiphyidx; /* == byifidx */ 133 } 134 if (bywiphyidx) 135 return bywiphyidx; 136 137 if (byifidx) 138 return byifidx; 139 140 return ERR_PTR(err); 141 } 142 143 struct cfg80211_registered_device * 144 cfg80211_get_dev_from_info(struct genl_info *info) 145 { 146 struct cfg80211_registered_device *rdev; 147 148 mutex_lock(&cfg80211_mutex); 149 rdev = __cfg80211_rdev_from_info(info); 150 151 /* if it is not an error we grab the lock on 152 * it to assure it won't be going away while 153 * we operate on it */ 154 if (!IS_ERR(rdev)) 155 mutex_lock(&rdev->mtx); 156 157 mutex_unlock(&cfg80211_mutex); 158 159 return rdev; 160 } 161 162 struct cfg80211_registered_device * 163 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) 164 { 165 struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV); 166 struct net_device *dev; 167 168 mutex_lock(&cfg80211_mutex); 169 dev = dev_get_by_index(net, ifindex); 170 if (!dev) 171 goto out; 172 if (dev->ieee80211_ptr) { 173 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy); 174 mutex_lock(&rdev->mtx); 175 } else 176 rdev = ERR_PTR(-ENODEV); 177 dev_put(dev); 178 out: 179 mutex_unlock(&cfg80211_mutex); 180 return rdev; 181 } 182 183 /* requires cfg80211_mutex to be held */ 184 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, 185 char *newname) 186 { 187 struct cfg80211_registered_device *rdev2; 188 int wiphy_idx, taken = -1, result, digits; 189 190 assert_cfg80211_lock(); 191 192 /* prohibit calling the thing phy%d when %d is not its number */ 193 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken); 194 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) { 195 /* count number of places needed to print wiphy_idx */ 196 digits = 1; 197 while (wiphy_idx /= 10) 198 digits++; 199 /* 200 * deny the name if it is phy<idx> where <idx> is printed 201 * without leading zeroes. taken == strlen(newname) here 202 */ 203 if (taken == strlen(PHY_NAME) + digits) 204 return -EINVAL; 205 } 206 207 208 /* Ignore nop renames */ 209 if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0) 210 return 0; 211 212 /* Ensure another device does not already have this name. */ 213 list_for_each_entry(rdev2, &cfg80211_rdev_list, list) 214 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0) 215 return -EINVAL; 216 217 result = device_rename(&rdev->wiphy.dev, newname); 218 if (result) 219 return result; 220 221 if (rdev->wiphy.debugfsdir && 222 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent, 223 rdev->wiphy.debugfsdir, 224 rdev->wiphy.debugfsdir->d_parent, 225 newname)) 226 pr_err("failed to rename debugfs dir to %s!\n", newname); 227 228 nl80211_notify_dev_rename(rdev); 229 230 return 0; 231 } 232 233 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, 234 struct net *net) 235 { 236 struct wireless_dev *wdev; 237 int err = 0; 238 239 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK)) 240 return -EOPNOTSUPP; 241 242 list_for_each_entry(wdev, &rdev->netdev_list, list) { 243 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 244 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); 245 if (err) 246 break; 247 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 248 } 249 250 if (err) { 251 /* failed -- clean up to old netns */ 252 net = wiphy_net(&rdev->wiphy); 253 254 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list, 255 list) { 256 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 257 err = dev_change_net_namespace(wdev->netdev, net, 258 "wlan%d"); 259 WARN_ON(err); 260 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 261 } 262 263 return err; 264 } 265 266 wiphy_net_set(&rdev->wiphy, net); 267 268 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev)); 269 WARN_ON(err); 270 271 return 0; 272 } 273 274 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data) 275 { 276 struct cfg80211_registered_device *rdev = data; 277 278 rdev->ops->rfkill_poll(&rdev->wiphy); 279 } 280 281 static int cfg80211_rfkill_set_block(void *data, bool blocked) 282 { 283 struct cfg80211_registered_device *rdev = data; 284 struct wireless_dev *wdev; 285 286 if (!blocked) 287 return 0; 288 289 rtnl_lock(); 290 mutex_lock(&rdev->devlist_mtx); 291 292 list_for_each_entry(wdev, &rdev->netdev_list, list) 293 dev_close(wdev->netdev); 294 295 mutex_unlock(&rdev->devlist_mtx); 296 rtnl_unlock(); 297 298 return 0; 299 } 300 301 static void cfg80211_rfkill_sync_work(struct work_struct *work) 302 { 303 struct cfg80211_registered_device *rdev; 304 305 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync); 306 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill)); 307 } 308 309 static void cfg80211_event_work(struct work_struct *work) 310 { 311 struct cfg80211_registered_device *rdev; 312 313 rdev = container_of(work, struct cfg80211_registered_device, 314 event_work); 315 316 rtnl_lock(); 317 cfg80211_lock_rdev(rdev); 318 319 cfg80211_process_rdev_events(rdev); 320 cfg80211_unlock_rdev(rdev); 321 rtnl_unlock(); 322 } 323 324 /* exported functions */ 325 326 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv) 327 { 328 static int wiphy_counter; 329 330 struct cfg80211_registered_device *rdev; 331 int alloc_size; 332 333 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 334 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 335 WARN_ON(ops->connect && !ops->disconnect); 336 WARN_ON(ops->join_ibss && !ops->leave_ibss); 337 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 338 WARN_ON(ops->add_station && !ops->del_station); 339 WARN_ON(ops->add_mpath && !ops->del_mpath); 340 WARN_ON(ops->join_mesh && !ops->leave_mesh); 341 342 alloc_size = sizeof(*rdev) + sizeof_priv; 343 344 rdev = kzalloc(alloc_size, GFP_KERNEL); 345 if (!rdev) 346 return NULL; 347 348 rdev->ops = ops; 349 350 mutex_lock(&cfg80211_mutex); 351 352 rdev->wiphy_idx = wiphy_counter++; 353 354 if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) { 355 wiphy_counter--; 356 mutex_unlock(&cfg80211_mutex); 357 /* ugh, wrapped! */ 358 kfree(rdev); 359 return NULL; 360 } 361 362 mutex_unlock(&cfg80211_mutex); 363 364 /* give it a proper name */ 365 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 366 367 mutex_init(&rdev->mtx); 368 mutex_init(&rdev->devlist_mtx); 369 mutex_init(&rdev->sched_scan_mtx); 370 INIT_LIST_HEAD(&rdev->netdev_list); 371 spin_lock_init(&rdev->bss_lock); 372 INIT_LIST_HEAD(&rdev->bss_list); 373 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 374 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results); 375 #ifdef CONFIG_CFG80211_WEXT 376 rdev->wiphy.wext = &cfg80211_wext_handler; 377 #endif 378 379 device_initialize(&rdev->wiphy.dev); 380 rdev->wiphy.dev.class = &ieee80211_class; 381 rdev->wiphy.dev.platform_data = rdev; 382 383 #ifdef CONFIG_CFG80211_DEFAULT_PS 384 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 385 #endif 386 387 wiphy_net_set(&rdev->wiphy, &init_net); 388 389 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 390 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 391 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 392 &rdev->rfkill_ops, rdev); 393 394 if (!rdev->rfkill) { 395 kfree(rdev); 396 return NULL; 397 } 398 399 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); 400 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 401 INIT_WORK(&rdev->event_work, cfg80211_event_work); 402 403 init_waitqueue_head(&rdev->dev_wait); 404 405 /* 406 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 407 * Fragmentation and RTS threshold are disabled by default with the 408 * special -1 value. 409 */ 410 rdev->wiphy.retry_short = 7; 411 rdev->wiphy.retry_long = 4; 412 rdev->wiphy.frag_threshold = (u32) -1; 413 rdev->wiphy.rts_threshold = (u32) -1; 414 rdev->wiphy.coverage_class = 0; 415 416 return &rdev->wiphy; 417 } 418 EXPORT_SYMBOL(wiphy_new); 419 420 static int wiphy_verify_combinations(struct wiphy *wiphy) 421 { 422 const struct ieee80211_iface_combination *c; 423 int i, j; 424 425 /* If we have combinations enforce them */ 426 if (wiphy->n_iface_combinations) 427 wiphy->flags |= WIPHY_FLAG_ENFORCE_COMBINATIONS; 428 429 for (i = 0; i < wiphy->n_iface_combinations; i++) { 430 u32 cnt = 0; 431 u16 all_iftypes = 0; 432 433 c = &wiphy->iface_combinations[i]; 434 435 /* Combinations with just one interface aren't real */ 436 if (WARN_ON(c->max_interfaces < 2)) 437 return -EINVAL; 438 439 /* Need at least one channel */ 440 if (WARN_ON(!c->num_different_channels)) 441 return -EINVAL; 442 443 if (WARN_ON(!c->n_limits)) 444 return -EINVAL; 445 446 for (j = 0; j < c->n_limits; j++) { 447 u16 types = c->limits[j].types; 448 449 /* 450 * interface types shouldn't overlap, this is 451 * used in cfg80211_can_change_interface() 452 */ 453 if (WARN_ON(types & all_iftypes)) 454 return -EINVAL; 455 all_iftypes |= types; 456 457 if (WARN_ON(!c->limits[j].max)) 458 return -EINVAL; 459 460 /* Shouldn't list software iftypes in combinations! */ 461 if (WARN_ON(wiphy->software_iftypes & types)) 462 return -EINVAL; 463 464 cnt += c->limits[j].max; 465 /* 466 * Don't advertise an unsupported type 467 * in a combination. 468 */ 469 if (WARN_ON((wiphy->interface_modes & types) != types)) 470 return -EINVAL; 471 } 472 473 /* You can't even choose that many! */ 474 if (WARN_ON(cnt < c->max_interfaces)) 475 return -EINVAL; 476 } 477 478 return 0; 479 } 480 481 int wiphy_register(struct wiphy *wiphy) 482 { 483 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 484 int res; 485 enum ieee80211_band band; 486 struct ieee80211_supported_band *sband; 487 bool have_band = false; 488 int i; 489 u16 ifmodes = wiphy->interface_modes; 490 491 if (WARN_ON((wiphy->wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 492 !(wiphy->wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 493 return -EINVAL; 494 495 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 496 return -EINVAL; 497 498 if (WARN_ON(wiphy->addresses && 499 !is_zero_ether_addr(wiphy->perm_addr) && 500 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 501 ETH_ALEN))) 502 return -EINVAL; 503 504 if (wiphy->addresses) 505 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 506 507 /* sanity check ifmodes */ 508 WARN_ON(!ifmodes); 509 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 510 if (WARN_ON(ifmodes != wiphy->interface_modes)) 511 wiphy->interface_modes = ifmodes; 512 513 res = wiphy_verify_combinations(wiphy); 514 if (res) 515 return res; 516 517 /* sanity check supported bands/channels */ 518 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 519 sband = wiphy->bands[band]; 520 if (!sband) 521 continue; 522 523 sband->band = band; 524 525 if (WARN_ON(!sband->n_channels || !sband->n_bitrates)) 526 return -EINVAL; 527 528 /* 529 * Since cfg80211_disable_40mhz_24ghz is global, we can 530 * modify the sband's ht data even if the driver uses a 531 * global structure for that. 532 */ 533 if (cfg80211_disable_40mhz_24ghz && 534 band == IEEE80211_BAND_2GHZ && 535 sband->ht_cap.ht_supported) { 536 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 537 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 538 } 539 540 /* 541 * Since we use a u32 for rate bitmaps in 542 * ieee80211_get_response_rate, we cannot 543 * have more than 32 legacy rates. 544 */ 545 if (WARN_ON(sband->n_bitrates > 32)) 546 return -EINVAL; 547 548 for (i = 0; i < sband->n_channels; i++) { 549 sband->channels[i].orig_flags = 550 sband->channels[i].flags; 551 sband->channels[i].orig_mag = 552 sband->channels[i].max_antenna_gain; 553 sband->channels[i].orig_mpwr = 554 sband->channels[i].max_power; 555 sband->channels[i].band = band; 556 } 557 558 have_band = true; 559 } 560 561 if (!have_band) { 562 WARN_ON(1); 563 return -EINVAL; 564 } 565 566 if (rdev->wiphy.wowlan.n_patterns) { 567 if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len || 568 rdev->wiphy.wowlan.pattern_min_len > 569 rdev->wiphy.wowlan.pattern_max_len)) 570 return -EINVAL; 571 } 572 573 /* check and set up bitrates */ 574 ieee80211_set_bitrate_flags(wiphy); 575 576 mutex_lock(&cfg80211_mutex); 577 578 res = device_add(&rdev->wiphy.dev); 579 if (res) { 580 mutex_unlock(&cfg80211_mutex); 581 return res; 582 } 583 584 /* set up regulatory info */ 585 wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE); 586 587 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 588 cfg80211_rdev_list_generation++; 589 590 /* add to debugfs */ 591 rdev->wiphy.debugfsdir = 592 debugfs_create_dir(wiphy_name(&rdev->wiphy), 593 ieee80211_debugfs_dir); 594 if (IS_ERR(rdev->wiphy.debugfsdir)) 595 rdev->wiphy.debugfsdir = NULL; 596 597 if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { 598 struct regulatory_request request; 599 600 request.wiphy_idx = get_wiphy_idx(wiphy); 601 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 602 request.alpha2[0] = '9'; 603 request.alpha2[1] = '9'; 604 605 nl80211_send_reg_change_event(&request); 606 } 607 608 cfg80211_debugfs_rdev_add(rdev); 609 mutex_unlock(&cfg80211_mutex); 610 611 /* 612 * due to a locking dependency this has to be outside of the 613 * cfg80211_mutex lock 614 */ 615 res = rfkill_register(rdev->rfkill); 616 if (res) 617 goto out_rm_dev; 618 619 rtnl_lock(); 620 rdev->wiphy.registered = true; 621 rtnl_unlock(); 622 return 0; 623 624 out_rm_dev: 625 device_del(&rdev->wiphy.dev); 626 return res; 627 } 628 EXPORT_SYMBOL(wiphy_register); 629 630 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 631 { 632 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 633 634 if (!rdev->ops->rfkill_poll) 635 return; 636 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 637 rfkill_resume_polling(rdev->rfkill); 638 } 639 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 640 641 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 642 { 643 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 644 645 rfkill_pause_polling(rdev->rfkill); 646 } 647 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 648 649 void wiphy_unregister(struct wiphy *wiphy) 650 { 651 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 652 653 rtnl_lock(); 654 rdev->wiphy.registered = false; 655 rtnl_unlock(); 656 657 rfkill_unregister(rdev->rfkill); 658 659 /* protect the device list */ 660 mutex_lock(&cfg80211_mutex); 661 662 wait_event(rdev->dev_wait, ({ 663 int __count; 664 mutex_lock(&rdev->devlist_mtx); 665 __count = rdev->opencount; 666 mutex_unlock(&rdev->devlist_mtx); 667 __count == 0;})); 668 669 mutex_lock(&rdev->devlist_mtx); 670 BUG_ON(!list_empty(&rdev->netdev_list)); 671 mutex_unlock(&rdev->devlist_mtx); 672 673 /* 674 * First remove the hardware from everywhere, this makes 675 * it impossible to find from userspace. 676 */ 677 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 678 list_del_rcu(&rdev->list); 679 synchronize_rcu(); 680 681 /* 682 * Try to grab rdev->mtx. If a command is still in progress, 683 * hopefully the driver will refuse it since it's tearing 684 * down the device already. We wait for this command to complete 685 * before unlinking the item from the list. 686 * Note: as codified by the BUG_ON above we cannot get here if 687 * a virtual interface is still present. Hence, we can only get 688 * to lock contention here if userspace issues a command that 689 * identified the hardware by wiphy index. 690 */ 691 cfg80211_lock_rdev(rdev); 692 /* nothing */ 693 cfg80211_unlock_rdev(rdev); 694 695 /* If this device got a regulatory hint tell core its 696 * free to listen now to a new shiny device regulatory hint */ 697 reg_device_remove(wiphy); 698 699 cfg80211_rdev_list_generation++; 700 device_del(&rdev->wiphy.dev); 701 702 mutex_unlock(&cfg80211_mutex); 703 704 flush_work(&rdev->scan_done_wk); 705 cancel_work_sync(&rdev->conn_work); 706 flush_work(&rdev->event_work); 707 } 708 EXPORT_SYMBOL(wiphy_unregister); 709 710 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 711 { 712 struct cfg80211_internal_bss *scan, *tmp; 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(scan, tmp, &rdev->bss_list, list) 718 cfg80211_put_bss(&scan->pub); 719 cfg80211_rdev_free_wowlan(rdev); 720 kfree(rdev); 721 } 722 723 void wiphy_free(struct wiphy *wiphy) 724 { 725 put_device(&wiphy->dev); 726 } 727 EXPORT_SYMBOL(wiphy_free); 728 729 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 730 { 731 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 732 733 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 734 schedule_work(&rdev->rfkill_sync); 735 } 736 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 737 738 static void wdev_cleanup_work(struct work_struct *work) 739 { 740 struct wireless_dev *wdev; 741 struct cfg80211_registered_device *rdev; 742 743 wdev = container_of(work, struct wireless_dev, cleanup_work); 744 rdev = wiphy_to_dev(wdev->wiphy); 745 746 cfg80211_lock_rdev(rdev); 747 748 if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) { 749 rdev->scan_req->aborted = true; 750 ___cfg80211_scan_done(rdev, true); 751 } 752 753 cfg80211_unlock_rdev(rdev); 754 755 mutex_lock(&rdev->sched_scan_mtx); 756 757 if (WARN_ON(rdev->sched_scan_req && 758 rdev->sched_scan_req->dev == wdev->netdev)) { 759 __cfg80211_stop_sched_scan(rdev, false); 760 } 761 762 mutex_unlock(&rdev->sched_scan_mtx); 763 764 mutex_lock(&rdev->devlist_mtx); 765 rdev->opencount--; 766 mutex_unlock(&rdev->devlist_mtx); 767 wake_up(&rdev->dev_wait); 768 769 dev_put(wdev->netdev); 770 } 771 772 static struct device_type wiphy_type = { 773 .name = "wlan", 774 }; 775 776 static int cfg80211_netdev_notifier_call(struct notifier_block * nb, 777 unsigned long state, 778 void *ndev) 779 { 780 struct net_device *dev = ndev; 781 struct wireless_dev *wdev = dev->ieee80211_ptr; 782 struct cfg80211_registered_device *rdev; 783 int ret; 784 785 if (!wdev) 786 return NOTIFY_DONE; 787 788 rdev = wiphy_to_dev(wdev->wiphy); 789 790 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 791 792 switch (state) { 793 case NETDEV_POST_INIT: 794 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 795 break; 796 case NETDEV_REGISTER: 797 /* 798 * NB: cannot take rdev->mtx here because this may be 799 * called within code protected by it when interfaces 800 * are added with nl80211. 801 */ 802 mutex_init(&wdev->mtx); 803 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work); 804 INIT_LIST_HEAD(&wdev->event_list); 805 spin_lock_init(&wdev->event_lock); 806 INIT_LIST_HEAD(&wdev->mgmt_registrations); 807 spin_lock_init(&wdev->mgmt_registrations_lock); 808 809 mutex_lock(&rdev->devlist_mtx); 810 list_add_rcu(&wdev->list, &rdev->netdev_list); 811 rdev->devlist_generation++; 812 /* can only change netns with wiphy */ 813 dev->features |= NETIF_F_NETNS_LOCAL; 814 815 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 816 "phy80211")) { 817 pr_err("failed to add phy80211 symlink to netdev!\n"); 818 } 819 wdev->netdev = dev; 820 wdev->sme_state = CFG80211_SME_IDLE; 821 mutex_unlock(&rdev->devlist_mtx); 822 #ifdef CONFIG_CFG80211_WEXT 823 wdev->wext.default_key = -1; 824 wdev->wext.default_mgmt_key = -1; 825 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 826 #endif 827 828 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 829 wdev->ps = true; 830 else 831 wdev->ps = false; 832 /* allow mac80211 to determine the timeout */ 833 wdev->ps_timeout = -1; 834 835 if (!dev->ethtool_ops) 836 dev->ethtool_ops = &cfg80211_ethtool_ops; 837 838 if ((wdev->iftype == NL80211_IFTYPE_STATION || 839 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 840 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 841 dev->priv_flags |= IFF_DONT_BRIDGE; 842 break; 843 case NETDEV_GOING_DOWN: 844 switch (wdev->iftype) { 845 case NL80211_IFTYPE_ADHOC: 846 cfg80211_leave_ibss(rdev, dev, true); 847 break; 848 case NL80211_IFTYPE_P2P_CLIENT: 849 case NL80211_IFTYPE_STATION: 850 mutex_lock(&rdev->sched_scan_mtx); 851 __cfg80211_stop_sched_scan(rdev, false); 852 mutex_unlock(&rdev->sched_scan_mtx); 853 854 wdev_lock(wdev); 855 #ifdef CONFIG_CFG80211_WEXT 856 kfree(wdev->wext.ie); 857 wdev->wext.ie = NULL; 858 wdev->wext.ie_len = 0; 859 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 860 #endif 861 __cfg80211_disconnect(rdev, dev, 862 WLAN_REASON_DEAUTH_LEAVING, true); 863 cfg80211_mlme_down(rdev, dev); 864 wdev_unlock(wdev); 865 break; 866 case NL80211_IFTYPE_MESH_POINT: 867 cfg80211_leave_mesh(rdev, dev); 868 break; 869 default: 870 break; 871 } 872 wdev->beacon_interval = 0; 873 break; 874 case NETDEV_DOWN: 875 dev_hold(dev); 876 queue_work(cfg80211_wq, &wdev->cleanup_work); 877 break; 878 case NETDEV_UP: 879 /* 880 * If we have a really quick DOWN/UP succession we may 881 * have this work still pending ... cancel it and see 882 * if it was pending, in which case we need to account 883 * for some of the work it would have done. 884 */ 885 if (cancel_work_sync(&wdev->cleanup_work)) { 886 mutex_lock(&rdev->devlist_mtx); 887 rdev->opencount--; 888 mutex_unlock(&rdev->devlist_mtx); 889 dev_put(dev); 890 } 891 cfg80211_lock_rdev(rdev); 892 mutex_lock(&rdev->devlist_mtx); 893 wdev_lock(wdev); 894 switch (wdev->iftype) { 895 #ifdef CONFIG_CFG80211_WEXT 896 case NL80211_IFTYPE_ADHOC: 897 cfg80211_ibss_wext_join(rdev, wdev); 898 break; 899 case NL80211_IFTYPE_STATION: 900 cfg80211_mgd_wext_connect(rdev, wdev); 901 break; 902 #endif 903 #ifdef CONFIG_MAC80211_MESH 904 case NL80211_IFTYPE_MESH_POINT: 905 { 906 /* backward compat code... */ 907 struct mesh_setup setup; 908 memcpy(&setup, &default_mesh_setup, 909 sizeof(setup)); 910 /* back compat only needed for mesh_id */ 911 setup.mesh_id = wdev->ssid; 912 setup.mesh_id_len = wdev->mesh_id_up_len; 913 if (wdev->mesh_id_up_len) 914 __cfg80211_join_mesh(rdev, dev, 915 &setup, 916 &default_mesh_config); 917 break; 918 } 919 #endif 920 default: 921 break; 922 } 923 wdev_unlock(wdev); 924 rdev->opencount++; 925 mutex_unlock(&rdev->devlist_mtx); 926 cfg80211_unlock_rdev(rdev); 927 928 /* 929 * Configure power management to the driver here so that its 930 * correctly set also after interface type changes etc. 931 */ 932 if ((wdev->iftype == NL80211_IFTYPE_STATION || 933 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 934 rdev->ops->set_power_mgmt) 935 if (rdev->ops->set_power_mgmt(wdev->wiphy, dev, 936 wdev->ps, 937 wdev->ps_timeout)) { 938 /* assume this means it's off */ 939 wdev->ps = false; 940 } 941 break; 942 case NETDEV_UNREGISTER: 943 /* 944 * NB: cannot take rdev->mtx here because this may be 945 * called within code protected by it when interfaces 946 * are removed with nl80211. 947 */ 948 mutex_lock(&rdev->devlist_mtx); 949 /* 950 * It is possible to get NETDEV_UNREGISTER 951 * multiple times. To detect that, check 952 * that the interface is still on the list 953 * of registered interfaces, and only then 954 * remove and clean it up. 955 */ 956 if (!list_empty(&wdev->list)) { 957 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 958 list_del_rcu(&wdev->list); 959 rdev->devlist_generation++; 960 cfg80211_mlme_purge_registrations(wdev); 961 #ifdef CONFIG_CFG80211_WEXT 962 kfree(wdev->wext.keys); 963 #endif 964 } 965 mutex_unlock(&rdev->devlist_mtx); 966 /* 967 * synchronise (so that we won't find this netdev 968 * from other code any more) and then clear the list 969 * head so that the above code can safely check for 970 * !list_empty() to avoid double-cleanup. 971 */ 972 synchronize_rcu(); 973 INIT_LIST_HEAD(&wdev->list); 974 break; 975 case NETDEV_PRE_UP: 976 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 977 return notifier_from_errno(-EOPNOTSUPP); 978 if (rfkill_blocked(rdev->rfkill)) 979 return notifier_from_errno(-ERFKILL); 980 ret = cfg80211_can_add_interface(rdev, wdev->iftype); 981 if (ret) 982 return notifier_from_errno(ret); 983 break; 984 } 985 986 return NOTIFY_DONE; 987 } 988 989 static struct notifier_block cfg80211_netdev_notifier = { 990 .notifier_call = cfg80211_netdev_notifier_call, 991 }; 992 993 static void __net_exit cfg80211_pernet_exit(struct net *net) 994 { 995 struct cfg80211_registered_device *rdev; 996 997 rtnl_lock(); 998 mutex_lock(&cfg80211_mutex); 999 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1000 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1001 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1002 } 1003 mutex_unlock(&cfg80211_mutex); 1004 rtnl_unlock(); 1005 } 1006 1007 static struct pernet_operations cfg80211_pernet_ops = { 1008 .exit = cfg80211_pernet_exit, 1009 }; 1010 1011 static int __init cfg80211_init(void) 1012 { 1013 int err; 1014 1015 err = register_pernet_device(&cfg80211_pernet_ops); 1016 if (err) 1017 goto out_fail_pernet; 1018 1019 err = wiphy_sysfs_init(); 1020 if (err) 1021 goto out_fail_sysfs; 1022 1023 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1024 if (err) 1025 goto out_fail_notifier; 1026 1027 err = nl80211_init(); 1028 if (err) 1029 goto out_fail_nl80211; 1030 1031 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1032 1033 err = regulatory_init(); 1034 if (err) 1035 goto out_fail_reg; 1036 1037 cfg80211_wq = create_singlethread_workqueue("cfg80211"); 1038 if (!cfg80211_wq) 1039 goto out_fail_wq; 1040 1041 return 0; 1042 1043 out_fail_wq: 1044 regulatory_exit(); 1045 out_fail_reg: 1046 debugfs_remove(ieee80211_debugfs_dir); 1047 out_fail_nl80211: 1048 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1049 out_fail_notifier: 1050 wiphy_sysfs_exit(); 1051 out_fail_sysfs: 1052 unregister_pernet_device(&cfg80211_pernet_ops); 1053 out_fail_pernet: 1054 return err; 1055 } 1056 subsys_initcall(cfg80211_init); 1057 1058 static void __exit cfg80211_exit(void) 1059 { 1060 debugfs_remove(ieee80211_debugfs_dir); 1061 nl80211_exit(); 1062 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1063 wiphy_sysfs_exit(); 1064 regulatory_exit(); 1065 unregister_pernet_device(&cfg80211_pernet_ops); 1066 destroy_workqueue(cfg80211_wq); 1067 } 1068 module_exit(cfg80211_exit); 1069