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->ap_sme_capa && 496 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 497 return -EINVAL; 498 499 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 500 return -EINVAL; 501 502 if (WARN_ON(wiphy->addresses && 503 !is_zero_ether_addr(wiphy->perm_addr) && 504 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 505 ETH_ALEN))) 506 return -EINVAL; 507 508 if (wiphy->addresses) 509 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 510 511 /* sanity check ifmodes */ 512 WARN_ON(!ifmodes); 513 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 514 if (WARN_ON(ifmodes != wiphy->interface_modes)) 515 wiphy->interface_modes = ifmodes; 516 517 res = wiphy_verify_combinations(wiphy); 518 if (res) 519 return res; 520 521 /* sanity check supported bands/channels */ 522 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 523 sband = wiphy->bands[band]; 524 if (!sband) 525 continue; 526 527 sband->band = band; 528 529 if (WARN_ON(!sband->n_channels || !sband->n_bitrates)) 530 return -EINVAL; 531 532 /* 533 * Since cfg80211_disable_40mhz_24ghz is global, we can 534 * modify the sband's ht data even if the driver uses a 535 * global structure for that. 536 */ 537 if (cfg80211_disable_40mhz_24ghz && 538 band == IEEE80211_BAND_2GHZ && 539 sband->ht_cap.ht_supported) { 540 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 541 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 542 } 543 544 /* 545 * Since we use a u32 for rate bitmaps in 546 * ieee80211_get_response_rate, we cannot 547 * have more than 32 legacy rates. 548 */ 549 if (WARN_ON(sband->n_bitrates > 32)) 550 return -EINVAL; 551 552 for (i = 0; i < sband->n_channels; i++) { 553 sband->channels[i].orig_flags = 554 sband->channels[i].flags; 555 sband->channels[i].orig_mag = 556 sband->channels[i].max_antenna_gain; 557 sband->channels[i].orig_mpwr = 558 sband->channels[i].max_power; 559 sband->channels[i].band = band; 560 } 561 562 have_band = true; 563 } 564 565 if (!have_band) { 566 WARN_ON(1); 567 return -EINVAL; 568 } 569 570 if (rdev->wiphy.wowlan.n_patterns) { 571 if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len || 572 rdev->wiphy.wowlan.pattern_min_len > 573 rdev->wiphy.wowlan.pattern_max_len)) 574 return -EINVAL; 575 } 576 577 /* check and set up bitrates */ 578 ieee80211_set_bitrate_flags(wiphy); 579 580 mutex_lock(&cfg80211_mutex); 581 582 res = device_add(&rdev->wiphy.dev); 583 if (res) { 584 mutex_unlock(&cfg80211_mutex); 585 return res; 586 } 587 588 /* set up regulatory info */ 589 regulatory_update(wiphy, NL80211_REGDOM_SET_BY_CORE); 590 591 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 592 cfg80211_rdev_list_generation++; 593 594 /* add to debugfs */ 595 rdev->wiphy.debugfsdir = 596 debugfs_create_dir(wiphy_name(&rdev->wiphy), 597 ieee80211_debugfs_dir); 598 if (IS_ERR(rdev->wiphy.debugfsdir)) 599 rdev->wiphy.debugfsdir = NULL; 600 601 if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { 602 struct regulatory_request request; 603 604 request.wiphy_idx = get_wiphy_idx(wiphy); 605 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 606 request.alpha2[0] = '9'; 607 request.alpha2[1] = '9'; 608 609 nl80211_send_reg_change_event(&request); 610 } 611 612 cfg80211_debugfs_rdev_add(rdev); 613 mutex_unlock(&cfg80211_mutex); 614 615 /* 616 * due to a locking dependency this has to be outside of the 617 * cfg80211_mutex lock 618 */ 619 res = rfkill_register(rdev->rfkill); 620 if (res) 621 goto out_rm_dev; 622 623 rtnl_lock(); 624 rdev->wiphy.registered = true; 625 rtnl_unlock(); 626 return 0; 627 628 out_rm_dev: 629 device_del(&rdev->wiphy.dev); 630 return res; 631 } 632 EXPORT_SYMBOL(wiphy_register); 633 634 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 635 { 636 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 637 638 if (!rdev->ops->rfkill_poll) 639 return; 640 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 641 rfkill_resume_polling(rdev->rfkill); 642 } 643 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 644 645 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 646 { 647 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 648 649 rfkill_pause_polling(rdev->rfkill); 650 } 651 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 652 653 void wiphy_unregister(struct wiphy *wiphy) 654 { 655 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 656 657 rtnl_lock(); 658 rdev->wiphy.registered = false; 659 rtnl_unlock(); 660 661 rfkill_unregister(rdev->rfkill); 662 663 /* protect the device list */ 664 mutex_lock(&cfg80211_mutex); 665 666 wait_event(rdev->dev_wait, ({ 667 int __count; 668 mutex_lock(&rdev->devlist_mtx); 669 __count = rdev->opencount; 670 mutex_unlock(&rdev->devlist_mtx); 671 __count == 0;})); 672 673 mutex_lock(&rdev->devlist_mtx); 674 BUG_ON(!list_empty(&rdev->netdev_list)); 675 mutex_unlock(&rdev->devlist_mtx); 676 677 /* 678 * First remove the hardware from everywhere, this makes 679 * it impossible to find from userspace. 680 */ 681 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 682 list_del_rcu(&rdev->list); 683 synchronize_rcu(); 684 685 /* 686 * Try to grab rdev->mtx. If a command is still in progress, 687 * hopefully the driver will refuse it since it's tearing 688 * down the device already. We wait for this command to complete 689 * before unlinking the item from the list. 690 * Note: as codified by the BUG_ON above we cannot get here if 691 * a virtual interface is still present. Hence, we can only get 692 * to lock contention here if userspace issues a command that 693 * identified the hardware by wiphy index. 694 */ 695 cfg80211_lock_rdev(rdev); 696 /* nothing */ 697 cfg80211_unlock_rdev(rdev); 698 699 /* If this device got a regulatory hint tell core its 700 * free to listen now to a new shiny device regulatory hint */ 701 reg_device_remove(wiphy); 702 703 cfg80211_rdev_list_generation++; 704 device_del(&rdev->wiphy.dev); 705 706 mutex_unlock(&cfg80211_mutex); 707 708 flush_work(&rdev->scan_done_wk); 709 cancel_work_sync(&rdev->conn_work); 710 flush_work(&rdev->event_work); 711 } 712 EXPORT_SYMBOL(wiphy_unregister); 713 714 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 715 { 716 struct cfg80211_internal_bss *scan, *tmp; 717 rfkill_destroy(rdev->rfkill); 718 mutex_destroy(&rdev->mtx); 719 mutex_destroy(&rdev->devlist_mtx); 720 mutex_destroy(&rdev->sched_scan_mtx); 721 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 722 cfg80211_put_bss(&scan->pub); 723 cfg80211_rdev_free_wowlan(rdev); 724 kfree(rdev); 725 } 726 727 void wiphy_free(struct wiphy *wiphy) 728 { 729 put_device(&wiphy->dev); 730 } 731 EXPORT_SYMBOL(wiphy_free); 732 733 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 734 { 735 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 736 737 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 738 schedule_work(&rdev->rfkill_sync); 739 } 740 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 741 742 static void wdev_cleanup_work(struct work_struct *work) 743 { 744 struct wireless_dev *wdev; 745 struct cfg80211_registered_device *rdev; 746 747 wdev = container_of(work, struct wireless_dev, cleanup_work); 748 rdev = wiphy_to_dev(wdev->wiphy); 749 750 cfg80211_lock_rdev(rdev); 751 752 if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) { 753 rdev->scan_req->aborted = true; 754 ___cfg80211_scan_done(rdev, true); 755 } 756 757 cfg80211_unlock_rdev(rdev); 758 759 mutex_lock(&rdev->sched_scan_mtx); 760 761 if (WARN_ON(rdev->sched_scan_req && 762 rdev->sched_scan_req->dev == wdev->netdev)) { 763 __cfg80211_stop_sched_scan(rdev, false); 764 } 765 766 mutex_unlock(&rdev->sched_scan_mtx); 767 768 mutex_lock(&rdev->devlist_mtx); 769 rdev->opencount--; 770 mutex_unlock(&rdev->devlist_mtx); 771 wake_up(&rdev->dev_wait); 772 773 dev_put(wdev->netdev); 774 } 775 776 static struct device_type wiphy_type = { 777 .name = "wlan", 778 }; 779 780 static int cfg80211_netdev_notifier_call(struct notifier_block * nb, 781 unsigned long state, 782 void *ndev) 783 { 784 struct net_device *dev = ndev; 785 struct wireless_dev *wdev = dev->ieee80211_ptr; 786 struct cfg80211_registered_device *rdev; 787 int ret; 788 789 if (!wdev) 790 return NOTIFY_DONE; 791 792 rdev = wiphy_to_dev(wdev->wiphy); 793 794 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 795 796 switch (state) { 797 case NETDEV_POST_INIT: 798 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 799 break; 800 case NETDEV_REGISTER: 801 /* 802 * NB: cannot take rdev->mtx here because this may be 803 * called within code protected by it when interfaces 804 * are added with nl80211. 805 */ 806 mutex_init(&wdev->mtx); 807 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work); 808 INIT_LIST_HEAD(&wdev->event_list); 809 spin_lock_init(&wdev->event_lock); 810 INIT_LIST_HEAD(&wdev->mgmt_registrations); 811 spin_lock_init(&wdev->mgmt_registrations_lock); 812 813 mutex_lock(&rdev->devlist_mtx); 814 list_add_rcu(&wdev->list, &rdev->netdev_list); 815 rdev->devlist_generation++; 816 /* can only change netns with wiphy */ 817 dev->features |= NETIF_F_NETNS_LOCAL; 818 819 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 820 "phy80211")) { 821 pr_err("failed to add phy80211 symlink to netdev!\n"); 822 } 823 wdev->netdev = dev; 824 wdev->sme_state = CFG80211_SME_IDLE; 825 mutex_unlock(&rdev->devlist_mtx); 826 #ifdef CONFIG_CFG80211_WEXT 827 wdev->wext.default_key = -1; 828 wdev->wext.default_mgmt_key = -1; 829 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 830 #endif 831 832 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 833 wdev->ps = true; 834 else 835 wdev->ps = false; 836 /* allow mac80211 to determine the timeout */ 837 wdev->ps_timeout = -1; 838 839 if (!dev->ethtool_ops) 840 dev->ethtool_ops = &cfg80211_ethtool_ops; 841 842 if ((wdev->iftype == NL80211_IFTYPE_STATION || 843 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 844 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 845 dev->priv_flags |= IFF_DONT_BRIDGE; 846 break; 847 case NETDEV_GOING_DOWN: 848 switch (wdev->iftype) { 849 case NL80211_IFTYPE_ADHOC: 850 cfg80211_leave_ibss(rdev, dev, true); 851 break; 852 case NL80211_IFTYPE_P2P_CLIENT: 853 case NL80211_IFTYPE_STATION: 854 mutex_lock(&rdev->sched_scan_mtx); 855 __cfg80211_stop_sched_scan(rdev, false); 856 mutex_unlock(&rdev->sched_scan_mtx); 857 858 wdev_lock(wdev); 859 #ifdef CONFIG_CFG80211_WEXT 860 kfree(wdev->wext.ie); 861 wdev->wext.ie = NULL; 862 wdev->wext.ie_len = 0; 863 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 864 #endif 865 __cfg80211_disconnect(rdev, dev, 866 WLAN_REASON_DEAUTH_LEAVING, true); 867 cfg80211_mlme_down(rdev, dev); 868 wdev_unlock(wdev); 869 break; 870 case NL80211_IFTYPE_MESH_POINT: 871 cfg80211_leave_mesh(rdev, dev); 872 break; 873 default: 874 break; 875 } 876 wdev->beacon_interval = 0; 877 break; 878 case NETDEV_DOWN: 879 dev_hold(dev); 880 queue_work(cfg80211_wq, &wdev->cleanup_work); 881 break; 882 case NETDEV_UP: 883 /* 884 * If we have a really quick DOWN/UP succession we may 885 * have this work still pending ... cancel it and see 886 * if it was pending, in which case we need to account 887 * for some of the work it would have done. 888 */ 889 if (cancel_work_sync(&wdev->cleanup_work)) { 890 mutex_lock(&rdev->devlist_mtx); 891 rdev->opencount--; 892 mutex_unlock(&rdev->devlist_mtx); 893 dev_put(dev); 894 } 895 cfg80211_lock_rdev(rdev); 896 mutex_lock(&rdev->devlist_mtx); 897 wdev_lock(wdev); 898 switch (wdev->iftype) { 899 #ifdef CONFIG_CFG80211_WEXT 900 case NL80211_IFTYPE_ADHOC: 901 cfg80211_ibss_wext_join(rdev, wdev); 902 break; 903 case NL80211_IFTYPE_STATION: 904 cfg80211_mgd_wext_connect(rdev, wdev); 905 break; 906 #endif 907 #ifdef CONFIG_MAC80211_MESH 908 case NL80211_IFTYPE_MESH_POINT: 909 { 910 /* backward compat code... */ 911 struct mesh_setup setup; 912 memcpy(&setup, &default_mesh_setup, 913 sizeof(setup)); 914 /* back compat only needed for mesh_id */ 915 setup.mesh_id = wdev->ssid; 916 setup.mesh_id_len = wdev->mesh_id_up_len; 917 if (wdev->mesh_id_up_len) 918 __cfg80211_join_mesh(rdev, dev, 919 &setup, 920 &default_mesh_config); 921 break; 922 } 923 #endif 924 default: 925 break; 926 } 927 wdev_unlock(wdev); 928 rdev->opencount++; 929 mutex_unlock(&rdev->devlist_mtx); 930 cfg80211_unlock_rdev(rdev); 931 932 /* 933 * Configure power management to the driver here so that its 934 * correctly set also after interface type changes etc. 935 */ 936 if ((wdev->iftype == NL80211_IFTYPE_STATION || 937 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 938 rdev->ops->set_power_mgmt) 939 if (rdev->ops->set_power_mgmt(wdev->wiphy, dev, 940 wdev->ps, 941 wdev->ps_timeout)) { 942 /* assume this means it's off */ 943 wdev->ps = false; 944 } 945 break; 946 case NETDEV_UNREGISTER: 947 /* 948 * NB: cannot take rdev->mtx here because this may be 949 * called within code protected by it when interfaces 950 * are removed with nl80211. 951 */ 952 mutex_lock(&rdev->devlist_mtx); 953 /* 954 * It is possible to get NETDEV_UNREGISTER 955 * multiple times. To detect that, check 956 * that the interface is still on the list 957 * of registered interfaces, and only then 958 * remove and clean it up. 959 */ 960 if (!list_empty(&wdev->list)) { 961 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 962 list_del_rcu(&wdev->list); 963 rdev->devlist_generation++; 964 cfg80211_mlme_purge_registrations(wdev); 965 #ifdef CONFIG_CFG80211_WEXT 966 kfree(wdev->wext.keys); 967 #endif 968 } 969 mutex_unlock(&rdev->devlist_mtx); 970 /* 971 * synchronise (so that we won't find this netdev 972 * from other code any more) and then clear the list 973 * head so that the above code can safely check for 974 * !list_empty() to avoid double-cleanup. 975 */ 976 synchronize_rcu(); 977 INIT_LIST_HEAD(&wdev->list); 978 break; 979 case NETDEV_PRE_UP: 980 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 981 return notifier_from_errno(-EOPNOTSUPP); 982 if (rfkill_blocked(rdev->rfkill)) 983 return notifier_from_errno(-ERFKILL); 984 ret = cfg80211_can_add_interface(rdev, wdev->iftype); 985 if (ret) 986 return notifier_from_errno(ret); 987 break; 988 } 989 990 return NOTIFY_DONE; 991 } 992 993 static struct notifier_block cfg80211_netdev_notifier = { 994 .notifier_call = cfg80211_netdev_notifier_call, 995 }; 996 997 static void __net_exit cfg80211_pernet_exit(struct net *net) 998 { 999 struct cfg80211_registered_device *rdev; 1000 1001 rtnl_lock(); 1002 mutex_lock(&cfg80211_mutex); 1003 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1004 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1005 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1006 } 1007 mutex_unlock(&cfg80211_mutex); 1008 rtnl_unlock(); 1009 } 1010 1011 static struct pernet_operations cfg80211_pernet_ops = { 1012 .exit = cfg80211_pernet_exit, 1013 }; 1014 1015 static int __init cfg80211_init(void) 1016 { 1017 int err; 1018 1019 err = register_pernet_device(&cfg80211_pernet_ops); 1020 if (err) 1021 goto out_fail_pernet; 1022 1023 err = wiphy_sysfs_init(); 1024 if (err) 1025 goto out_fail_sysfs; 1026 1027 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1028 if (err) 1029 goto out_fail_notifier; 1030 1031 err = nl80211_init(); 1032 if (err) 1033 goto out_fail_nl80211; 1034 1035 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1036 1037 err = regulatory_init(); 1038 if (err) 1039 goto out_fail_reg; 1040 1041 cfg80211_wq = create_singlethread_workqueue("cfg80211"); 1042 if (!cfg80211_wq) 1043 goto out_fail_wq; 1044 1045 return 0; 1046 1047 out_fail_wq: 1048 regulatory_exit(); 1049 out_fail_reg: 1050 debugfs_remove(ieee80211_debugfs_dir); 1051 out_fail_nl80211: 1052 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1053 out_fail_notifier: 1054 wiphy_sysfs_exit(); 1055 out_fail_sysfs: 1056 unregister_pernet_device(&cfg80211_pernet_ops); 1057 out_fail_pernet: 1058 return err; 1059 } 1060 subsys_initcall(cfg80211_init); 1061 1062 static void __exit cfg80211_exit(void) 1063 { 1064 debugfs_remove(ieee80211_debugfs_dir); 1065 nl80211_exit(); 1066 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1067 wiphy_sysfs_exit(); 1068 regulatory_exit(); 1069 unregister_pernet_device(&cfg80211_pernet_ops); 1070 destroy_workqueue(cfg80211_wq); 1071 } 1072 module_exit(cfg80211_exit); 1073