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->addresses && !wiphy->n_addresses)) 492 return -EINVAL; 493 494 if (WARN_ON(wiphy->addresses && 495 !is_zero_ether_addr(wiphy->perm_addr) && 496 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 497 ETH_ALEN))) 498 return -EINVAL; 499 500 if (wiphy->addresses) 501 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 502 503 /* sanity check ifmodes */ 504 WARN_ON(!ifmodes); 505 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 506 if (WARN_ON(ifmodes != wiphy->interface_modes)) 507 wiphy->interface_modes = ifmodes; 508 509 res = wiphy_verify_combinations(wiphy); 510 if (res) 511 return res; 512 513 /* sanity check supported bands/channels */ 514 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 515 sband = wiphy->bands[band]; 516 if (!sband) 517 continue; 518 519 sband->band = band; 520 521 if (WARN_ON(!sband->n_channels || !sband->n_bitrates)) 522 return -EINVAL; 523 524 /* 525 * Since cfg80211_disable_40mhz_24ghz is global, we can 526 * modify the sband's ht data even if the driver uses a 527 * global structure for that. 528 */ 529 if (cfg80211_disable_40mhz_24ghz && 530 band == IEEE80211_BAND_2GHZ && 531 sband->ht_cap.ht_supported) { 532 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 533 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 534 } 535 536 /* 537 * Since we use a u32 for rate bitmaps in 538 * ieee80211_get_response_rate, we cannot 539 * have more than 32 legacy rates. 540 */ 541 if (WARN_ON(sband->n_bitrates > 32)) 542 return -EINVAL; 543 544 for (i = 0; i < sband->n_channels; i++) { 545 sband->channels[i].orig_flags = 546 sband->channels[i].flags; 547 sband->channels[i].orig_mag = 548 sband->channels[i].max_antenna_gain; 549 sband->channels[i].orig_mpwr = 550 sband->channels[i].max_power; 551 sband->channels[i].band = band; 552 } 553 554 have_band = true; 555 } 556 557 if (!have_band) { 558 WARN_ON(1); 559 return -EINVAL; 560 } 561 562 if (rdev->wiphy.wowlan.n_patterns) { 563 if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len || 564 rdev->wiphy.wowlan.pattern_min_len > 565 rdev->wiphy.wowlan.pattern_max_len)) 566 return -EINVAL; 567 } 568 569 /* check and set up bitrates */ 570 ieee80211_set_bitrate_flags(wiphy); 571 572 mutex_lock(&cfg80211_mutex); 573 574 res = device_add(&rdev->wiphy.dev); 575 if (res) { 576 mutex_unlock(&cfg80211_mutex); 577 return res; 578 } 579 580 /* set up regulatory info */ 581 wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE); 582 583 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 584 cfg80211_rdev_list_generation++; 585 586 /* add to debugfs */ 587 rdev->wiphy.debugfsdir = 588 debugfs_create_dir(wiphy_name(&rdev->wiphy), 589 ieee80211_debugfs_dir); 590 if (IS_ERR(rdev->wiphy.debugfsdir)) 591 rdev->wiphy.debugfsdir = NULL; 592 593 if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { 594 struct regulatory_request request; 595 596 request.wiphy_idx = get_wiphy_idx(wiphy); 597 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 598 request.alpha2[0] = '9'; 599 request.alpha2[1] = '9'; 600 601 nl80211_send_reg_change_event(&request); 602 } 603 604 cfg80211_debugfs_rdev_add(rdev); 605 mutex_unlock(&cfg80211_mutex); 606 607 /* 608 * due to a locking dependency this has to be outside of the 609 * cfg80211_mutex lock 610 */ 611 res = rfkill_register(rdev->rfkill); 612 if (res) 613 goto out_rm_dev; 614 615 return 0; 616 617 out_rm_dev: 618 device_del(&rdev->wiphy.dev); 619 return res; 620 } 621 EXPORT_SYMBOL(wiphy_register); 622 623 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 624 { 625 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 626 627 if (!rdev->ops->rfkill_poll) 628 return; 629 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 630 rfkill_resume_polling(rdev->rfkill); 631 } 632 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 633 634 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 635 { 636 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 637 638 rfkill_pause_polling(rdev->rfkill); 639 } 640 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 641 642 void wiphy_unregister(struct wiphy *wiphy) 643 { 644 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 645 646 rfkill_unregister(rdev->rfkill); 647 648 /* protect the device list */ 649 mutex_lock(&cfg80211_mutex); 650 651 wait_event(rdev->dev_wait, ({ 652 int __count; 653 mutex_lock(&rdev->devlist_mtx); 654 __count = rdev->opencount; 655 mutex_unlock(&rdev->devlist_mtx); 656 __count == 0;})); 657 658 mutex_lock(&rdev->devlist_mtx); 659 BUG_ON(!list_empty(&rdev->netdev_list)); 660 mutex_unlock(&rdev->devlist_mtx); 661 662 /* 663 * First remove the hardware from everywhere, this makes 664 * it impossible to find from userspace. 665 */ 666 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 667 list_del_rcu(&rdev->list); 668 synchronize_rcu(); 669 670 /* 671 * Try to grab rdev->mtx. If a command is still in progress, 672 * hopefully the driver will refuse it since it's tearing 673 * down the device already. We wait for this command to complete 674 * before unlinking the item from the list. 675 * Note: as codified by the BUG_ON above we cannot get here if 676 * a virtual interface is still present. Hence, we can only get 677 * to lock contention here if userspace issues a command that 678 * identified the hardware by wiphy index. 679 */ 680 cfg80211_lock_rdev(rdev); 681 /* nothing */ 682 cfg80211_unlock_rdev(rdev); 683 684 /* If this device got a regulatory hint tell core its 685 * free to listen now to a new shiny device regulatory hint */ 686 reg_device_remove(wiphy); 687 688 cfg80211_rdev_list_generation++; 689 device_del(&rdev->wiphy.dev); 690 691 mutex_unlock(&cfg80211_mutex); 692 693 flush_work(&rdev->scan_done_wk); 694 cancel_work_sync(&rdev->conn_work); 695 flush_work(&rdev->event_work); 696 } 697 EXPORT_SYMBOL(wiphy_unregister); 698 699 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 700 { 701 struct cfg80211_internal_bss *scan, *tmp; 702 rfkill_destroy(rdev->rfkill); 703 mutex_destroy(&rdev->mtx); 704 mutex_destroy(&rdev->devlist_mtx); 705 mutex_destroy(&rdev->sched_scan_mtx); 706 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 707 cfg80211_put_bss(&scan->pub); 708 cfg80211_rdev_free_wowlan(rdev); 709 kfree(rdev); 710 } 711 712 void wiphy_free(struct wiphy *wiphy) 713 { 714 put_device(&wiphy->dev); 715 } 716 EXPORT_SYMBOL(wiphy_free); 717 718 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 719 { 720 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 721 722 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 723 schedule_work(&rdev->rfkill_sync); 724 } 725 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 726 727 static void wdev_cleanup_work(struct work_struct *work) 728 { 729 struct wireless_dev *wdev; 730 struct cfg80211_registered_device *rdev; 731 732 wdev = container_of(work, struct wireless_dev, cleanup_work); 733 rdev = wiphy_to_dev(wdev->wiphy); 734 735 cfg80211_lock_rdev(rdev); 736 737 if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) { 738 rdev->scan_req->aborted = true; 739 ___cfg80211_scan_done(rdev, true); 740 } 741 742 cfg80211_unlock_rdev(rdev); 743 744 mutex_lock(&rdev->sched_scan_mtx); 745 746 if (WARN_ON(rdev->sched_scan_req && 747 rdev->sched_scan_req->dev == wdev->netdev)) { 748 __cfg80211_stop_sched_scan(rdev, false); 749 } 750 751 mutex_unlock(&rdev->sched_scan_mtx); 752 753 mutex_lock(&rdev->devlist_mtx); 754 rdev->opencount--; 755 mutex_unlock(&rdev->devlist_mtx); 756 wake_up(&rdev->dev_wait); 757 758 dev_put(wdev->netdev); 759 } 760 761 static struct device_type wiphy_type = { 762 .name = "wlan", 763 }; 764 765 static int cfg80211_netdev_notifier_call(struct notifier_block * nb, 766 unsigned long state, 767 void *ndev) 768 { 769 struct net_device *dev = ndev; 770 struct wireless_dev *wdev = dev->ieee80211_ptr; 771 struct cfg80211_registered_device *rdev; 772 int ret; 773 774 if (!wdev) 775 return NOTIFY_DONE; 776 777 rdev = wiphy_to_dev(wdev->wiphy); 778 779 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 780 781 switch (state) { 782 case NETDEV_POST_INIT: 783 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 784 break; 785 case NETDEV_REGISTER: 786 /* 787 * NB: cannot take rdev->mtx here because this may be 788 * called within code protected by it when interfaces 789 * are added with nl80211. 790 */ 791 mutex_init(&wdev->mtx); 792 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work); 793 INIT_LIST_HEAD(&wdev->event_list); 794 spin_lock_init(&wdev->event_lock); 795 INIT_LIST_HEAD(&wdev->mgmt_registrations); 796 spin_lock_init(&wdev->mgmt_registrations_lock); 797 798 mutex_lock(&rdev->devlist_mtx); 799 list_add_rcu(&wdev->list, &rdev->netdev_list); 800 rdev->devlist_generation++; 801 /* can only change netns with wiphy */ 802 dev->features |= NETIF_F_NETNS_LOCAL; 803 804 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 805 "phy80211")) { 806 pr_err("failed to add phy80211 symlink to netdev!\n"); 807 } 808 wdev->netdev = dev; 809 wdev->sme_state = CFG80211_SME_IDLE; 810 mutex_unlock(&rdev->devlist_mtx); 811 #ifdef CONFIG_CFG80211_WEXT 812 wdev->wext.default_key = -1; 813 wdev->wext.default_mgmt_key = -1; 814 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 815 #endif 816 817 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 818 wdev->ps = true; 819 else 820 wdev->ps = false; 821 /* allow mac80211 to determine the timeout */ 822 wdev->ps_timeout = -1; 823 824 if (!dev->ethtool_ops) 825 dev->ethtool_ops = &cfg80211_ethtool_ops; 826 827 if ((wdev->iftype == NL80211_IFTYPE_STATION || 828 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 829 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 830 dev->priv_flags |= IFF_DONT_BRIDGE; 831 break; 832 case NETDEV_GOING_DOWN: 833 switch (wdev->iftype) { 834 case NL80211_IFTYPE_ADHOC: 835 cfg80211_leave_ibss(rdev, dev, true); 836 break; 837 case NL80211_IFTYPE_P2P_CLIENT: 838 case NL80211_IFTYPE_STATION: 839 mutex_lock(&rdev->sched_scan_mtx); 840 __cfg80211_stop_sched_scan(rdev, false); 841 mutex_unlock(&rdev->sched_scan_mtx); 842 843 wdev_lock(wdev); 844 #ifdef CONFIG_CFG80211_WEXT 845 kfree(wdev->wext.ie); 846 wdev->wext.ie = NULL; 847 wdev->wext.ie_len = 0; 848 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 849 #endif 850 __cfg80211_disconnect(rdev, dev, 851 WLAN_REASON_DEAUTH_LEAVING, true); 852 cfg80211_mlme_down(rdev, dev); 853 wdev_unlock(wdev); 854 break; 855 case NL80211_IFTYPE_MESH_POINT: 856 cfg80211_leave_mesh(rdev, dev); 857 break; 858 default: 859 break; 860 } 861 wdev->beacon_interval = 0; 862 break; 863 case NETDEV_DOWN: 864 dev_hold(dev); 865 queue_work(cfg80211_wq, &wdev->cleanup_work); 866 break; 867 case NETDEV_UP: 868 /* 869 * If we have a really quick DOWN/UP succession we may 870 * have this work still pending ... cancel it and see 871 * if it was pending, in which case we need to account 872 * for some of the work it would have done. 873 */ 874 if (cancel_work_sync(&wdev->cleanup_work)) { 875 mutex_lock(&rdev->devlist_mtx); 876 rdev->opencount--; 877 mutex_unlock(&rdev->devlist_mtx); 878 dev_put(dev); 879 } 880 cfg80211_lock_rdev(rdev); 881 mutex_lock(&rdev->devlist_mtx); 882 wdev_lock(wdev); 883 switch (wdev->iftype) { 884 #ifdef CONFIG_CFG80211_WEXT 885 case NL80211_IFTYPE_ADHOC: 886 cfg80211_ibss_wext_join(rdev, wdev); 887 break; 888 case NL80211_IFTYPE_STATION: 889 cfg80211_mgd_wext_connect(rdev, wdev); 890 break; 891 #endif 892 #ifdef CONFIG_MAC80211_MESH 893 case NL80211_IFTYPE_MESH_POINT: 894 { 895 /* backward compat code... */ 896 struct mesh_setup setup; 897 memcpy(&setup, &default_mesh_setup, 898 sizeof(setup)); 899 /* back compat only needed for mesh_id */ 900 setup.mesh_id = wdev->ssid; 901 setup.mesh_id_len = wdev->mesh_id_up_len; 902 if (wdev->mesh_id_up_len) 903 __cfg80211_join_mesh(rdev, dev, 904 &setup, 905 &default_mesh_config); 906 break; 907 } 908 #endif 909 default: 910 break; 911 } 912 wdev_unlock(wdev); 913 rdev->opencount++; 914 mutex_unlock(&rdev->devlist_mtx); 915 cfg80211_unlock_rdev(rdev); 916 917 /* 918 * Configure power management to the driver here so that its 919 * correctly set also after interface type changes etc. 920 */ 921 if (wdev->iftype == NL80211_IFTYPE_STATION && 922 rdev->ops->set_power_mgmt) 923 if (rdev->ops->set_power_mgmt(wdev->wiphy, dev, 924 wdev->ps, 925 wdev->ps_timeout)) { 926 /* assume this means it's off */ 927 wdev->ps = false; 928 } 929 break; 930 case NETDEV_UNREGISTER: 931 /* 932 * NB: cannot take rdev->mtx here because this may be 933 * called within code protected by it when interfaces 934 * are removed with nl80211. 935 */ 936 mutex_lock(&rdev->devlist_mtx); 937 /* 938 * It is possible to get NETDEV_UNREGISTER 939 * multiple times. To detect that, check 940 * that the interface is still on the list 941 * of registered interfaces, and only then 942 * remove and clean it up. 943 */ 944 if (!list_empty(&wdev->list)) { 945 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 946 list_del_rcu(&wdev->list); 947 rdev->devlist_generation++; 948 cfg80211_mlme_purge_registrations(wdev); 949 #ifdef CONFIG_CFG80211_WEXT 950 kfree(wdev->wext.keys); 951 #endif 952 } 953 mutex_unlock(&rdev->devlist_mtx); 954 /* 955 * synchronise (so that we won't find this netdev 956 * from other code any more) and then clear the list 957 * head so that the above code can safely check for 958 * !list_empty() to avoid double-cleanup. 959 */ 960 synchronize_rcu(); 961 INIT_LIST_HEAD(&wdev->list); 962 break; 963 case NETDEV_PRE_UP: 964 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 965 return notifier_from_errno(-EOPNOTSUPP); 966 if (rfkill_blocked(rdev->rfkill)) 967 return notifier_from_errno(-ERFKILL); 968 ret = cfg80211_can_add_interface(rdev, wdev->iftype); 969 if (ret) 970 return notifier_from_errno(ret); 971 break; 972 } 973 974 return NOTIFY_DONE; 975 } 976 977 static struct notifier_block cfg80211_netdev_notifier = { 978 .notifier_call = cfg80211_netdev_notifier_call, 979 }; 980 981 static void __net_exit cfg80211_pernet_exit(struct net *net) 982 { 983 struct cfg80211_registered_device *rdev; 984 985 rtnl_lock(); 986 mutex_lock(&cfg80211_mutex); 987 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 988 if (net_eq(wiphy_net(&rdev->wiphy), net)) 989 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 990 } 991 mutex_unlock(&cfg80211_mutex); 992 rtnl_unlock(); 993 } 994 995 static struct pernet_operations cfg80211_pernet_ops = { 996 .exit = cfg80211_pernet_exit, 997 }; 998 999 static int __init cfg80211_init(void) 1000 { 1001 int err; 1002 1003 err = register_pernet_device(&cfg80211_pernet_ops); 1004 if (err) 1005 goto out_fail_pernet; 1006 1007 err = wiphy_sysfs_init(); 1008 if (err) 1009 goto out_fail_sysfs; 1010 1011 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1012 if (err) 1013 goto out_fail_notifier; 1014 1015 err = nl80211_init(); 1016 if (err) 1017 goto out_fail_nl80211; 1018 1019 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1020 1021 err = regulatory_init(); 1022 if (err) 1023 goto out_fail_reg; 1024 1025 cfg80211_wq = create_singlethread_workqueue("cfg80211"); 1026 if (!cfg80211_wq) 1027 goto out_fail_wq; 1028 1029 return 0; 1030 1031 out_fail_wq: 1032 regulatory_exit(); 1033 out_fail_reg: 1034 debugfs_remove(ieee80211_debugfs_dir); 1035 out_fail_nl80211: 1036 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1037 out_fail_notifier: 1038 wiphy_sysfs_exit(); 1039 out_fail_sysfs: 1040 unregister_pernet_device(&cfg80211_pernet_ops); 1041 out_fail_pernet: 1042 return err; 1043 } 1044 subsys_initcall(cfg80211_init); 1045 1046 static void __exit cfg80211_exit(void) 1047 { 1048 debugfs_remove(ieee80211_debugfs_dir); 1049 nl80211_exit(); 1050 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1051 wiphy_sysfs_exit(); 1052 regulatory_exit(); 1053 unregister_pernet_device(&cfg80211_pernet_ops); 1054 destroy_workqueue(cfg80211_wq); 1055 } 1056 module_exit(cfg80211_exit); 1057