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 INIT_LIST_HEAD(&rdev->netdev_list); 370 spin_lock_init(&rdev->bss_lock); 371 INIT_LIST_HEAD(&rdev->bss_list); 372 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 373 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results); 374 #ifdef CONFIG_CFG80211_WEXT 375 rdev->wiphy.wext = &cfg80211_wext_handler; 376 #endif 377 378 device_initialize(&rdev->wiphy.dev); 379 rdev->wiphy.dev.class = &ieee80211_class; 380 rdev->wiphy.dev.platform_data = rdev; 381 382 #ifdef CONFIG_CFG80211_DEFAULT_PS 383 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 384 #endif 385 386 wiphy_net_set(&rdev->wiphy, &init_net); 387 388 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 389 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 390 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 391 &rdev->rfkill_ops, rdev); 392 393 if (!rdev->rfkill) { 394 kfree(rdev); 395 return NULL; 396 } 397 398 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); 399 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 400 INIT_WORK(&rdev->event_work, cfg80211_event_work); 401 402 init_waitqueue_head(&rdev->dev_wait); 403 404 /* 405 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 406 * Fragmentation and RTS threshold are disabled by default with the 407 * special -1 value. 408 */ 409 rdev->wiphy.retry_short = 7; 410 rdev->wiphy.retry_long = 4; 411 rdev->wiphy.frag_threshold = (u32) -1; 412 rdev->wiphy.rts_threshold = (u32) -1; 413 rdev->wiphy.coverage_class = 0; 414 415 return &rdev->wiphy; 416 } 417 EXPORT_SYMBOL(wiphy_new); 418 419 static int wiphy_verify_combinations(struct wiphy *wiphy) 420 { 421 const struct ieee80211_iface_combination *c; 422 int i, j; 423 424 /* If we have combinations enforce them */ 425 if (wiphy->n_iface_combinations) 426 wiphy->flags |= WIPHY_FLAG_ENFORCE_COMBINATIONS; 427 428 for (i = 0; i < wiphy->n_iface_combinations; i++) { 429 u32 cnt = 0; 430 u16 all_iftypes = 0; 431 432 c = &wiphy->iface_combinations[i]; 433 434 /* Combinations with just one interface aren't real */ 435 if (WARN_ON(c->max_interfaces < 2)) 436 return -EINVAL; 437 438 /* Need at least one channel */ 439 if (WARN_ON(!c->num_different_channels)) 440 return -EINVAL; 441 442 if (WARN_ON(!c->n_limits)) 443 return -EINVAL; 444 445 for (j = 0; j < c->n_limits; j++) { 446 u16 types = c->limits[j].types; 447 448 /* 449 * interface types shouldn't overlap, this is 450 * used in cfg80211_can_change_interface() 451 */ 452 if (WARN_ON(types & all_iftypes)) 453 return -EINVAL; 454 all_iftypes |= types; 455 456 if (WARN_ON(!c->limits[j].max)) 457 return -EINVAL; 458 459 /* Shouldn't list software iftypes in combinations! */ 460 if (WARN_ON(wiphy->software_iftypes & types)) 461 return -EINVAL; 462 463 cnt += c->limits[j].max; 464 /* 465 * Don't advertise an unsupported type 466 * in a combination. 467 */ 468 if (WARN_ON((wiphy->interface_modes & types) != types)) 469 return -EINVAL; 470 } 471 472 /* You can't even choose that many! */ 473 if (WARN_ON(cnt < c->max_interfaces)) 474 return -EINVAL; 475 } 476 477 return 0; 478 } 479 480 int wiphy_register(struct wiphy *wiphy) 481 { 482 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 483 int res; 484 enum ieee80211_band band; 485 struct ieee80211_supported_band *sband; 486 bool have_band = false; 487 int i; 488 u16 ifmodes = wiphy->interface_modes; 489 490 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 491 return -EINVAL; 492 493 if (WARN_ON(wiphy->addresses && 494 !is_zero_ether_addr(wiphy->perm_addr) && 495 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 496 ETH_ALEN))) 497 return -EINVAL; 498 499 if (wiphy->addresses) 500 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 501 502 /* sanity check ifmodes */ 503 WARN_ON(!ifmodes); 504 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 505 if (WARN_ON(ifmodes != wiphy->interface_modes)) 506 wiphy->interface_modes = ifmodes; 507 508 res = wiphy_verify_combinations(wiphy); 509 if (res) 510 return res; 511 512 /* sanity check supported bands/channels */ 513 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 514 sband = wiphy->bands[band]; 515 if (!sband) 516 continue; 517 518 sband->band = band; 519 520 if (WARN_ON(!sband->n_channels || !sband->n_bitrates)) 521 return -EINVAL; 522 523 /* 524 * Since cfg80211_disable_40mhz_24ghz is global, we can 525 * modify the sband's ht data even if the driver uses a 526 * global structure for that. 527 */ 528 if (cfg80211_disable_40mhz_24ghz && 529 band == IEEE80211_BAND_2GHZ && 530 sband->ht_cap.ht_supported) { 531 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 532 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 533 } 534 535 /* 536 * Since we use a u32 for rate bitmaps in 537 * ieee80211_get_response_rate, we cannot 538 * have more than 32 legacy rates. 539 */ 540 if (WARN_ON(sband->n_bitrates > 32)) 541 return -EINVAL; 542 543 for (i = 0; i < sband->n_channels; i++) { 544 sband->channels[i].orig_flags = 545 sband->channels[i].flags; 546 sband->channels[i].orig_mag = 547 sband->channels[i].max_antenna_gain; 548 sband->channels[i].orig_mpwr = 549 sband->channels[i].max_power; 550 sband->channels[i].band = band; 551 } 552 553 have_band = true; 554 } 555 556 if (!have_band) { 557 WARN_ON(1); 558 return -EINVAL; 559 } 560 561 if (rdev->wiphy.wowlan.n_patterns) { 562 if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len || 563 rdev->wiphy.wowlan.pattern_min_len > 564 rdev->wiphy.wowlan.pattern_max_len)) 565 return -EINVAL; 566 } 567 568 /* check and set up bitrates */ 569 ieee80211_set_bitrate_flags(wiphy); 570 571 mutex_lock(&cfg80211_mutex); 572 573 res = device_add(&rdev->wiphy.dev); 574 if (res) { 575 mutex_unlock(&cfg80211_mutex); 576 return res; 577 } 578 579 /* set up regulatory info */ 580 wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE); 581 582 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 583 cfg80211_rdev_list_generation++; 584 585 /* add to debugfs */ 586 rdev->wiphy.debugfsdir = 587 debugfs_create_dir(wiphy_name(&rdev->wiphy), 588 ieee80211_debugfs_dir); 589 if (IS_ERR(rdev->wiphy.debugfsdir)) 590 rdev->wiphy.debugfsdir = NULL; 591 592 if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { 593 struct regulatory_request request; 594 595 request.wiphy_idx = get_wiphy_idx(wiphy); 596 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 597 request.alpha2[0] = '9'; 598 request.alpha2[1] = '9'; 599 600 nl80211_send_reg_change_event(&request); 601 } 602 603 cfg80211_debugfs_rdev_add(rdev); 604 mutex_unlock(&cfg80211_mutex); 605 606 /* 607 * due to a locking dependency this has to be outside of the 608 * cfg80211_mutex lock 609 */ 610 res = rfkill_register(rdev->rfkill); 611 if (res) 612 goto out_rm_dev; 613 614 return 0; 615 616 out_rm_dev: 617 device_del(&rdev->wiphy.dev); 618 return res; 619 } 620 EXPORT_SYMBOL(wiphy_register); 621 622 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 623 { 624 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 625 626 if (!rdev->ops->rfkill_poll) 627 return; 628 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 629 rfkill_resume_polling(rdev->rfkill); 630 } 631 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 632 633 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 634 { 635 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 636 637 rfkill_pause_polling(rdev->rfkill); 638 } 639 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 640 641 void wiphy_unregister(struct wiphy *wiphy) 642 { 643 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 644 645 rfkill_unregister(rdev->rfkill); 646 647 /* protect the device list */ 648 mutex_lock(&cfg80211_mutex); 649 650 wait_event(rdev->dev_wait, ({ 651 int __count; 652 mutex_lock(&rdev->devlist_mtx); 653 __count = rdev->opencount; 654 mutex_unlock(&rdev->devlist_mtx); 655 __count == 0;})); 656 657 mutex_lock(&rdev->devlist_mtx); 658 BUG_ON(!list_empty(&rdev->netdev_list)); 659 mutex_unlock(&rdev->devlist_mtx); 660 661 /* 662 * First remove the hardware from everywhere, this makes 663 * it impossible to find from userspace. 664 */ 665 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 666 list_del_rcu(&rdev->list); 667 synchronize_rcu(); 668 669 /* 670 * Try to grab rdev->mtx. If a command is still in progress, 671 * hopefully the driver will refuse it since it's tearing 672 * down the device already. We wait for this command to complete 673 * before unlinking the item from the list. 674 * Note: as codified by the BUG_ON above we cannot get here if 675 * a virtual interface is still present. Hence, we can only get 676 * to lock contention here if userspace issues a command that 677 * identified the hardware by wiphy index. 678 */ 679 cfg80211_lock_rdev(rdev); 680 /* nothing */ 681 cfg80211_unlock_rdev(rdev); 682 683 /* If this device got a regulatory hint tell core its 684 * free to listen now to a new shiny device regulatory hint */ 685 reg_device_remove(wiphy); 686 687 cfg80211_rdev_list_generation++; 688 device_del(&rdev->wiphy.dev); 689 690 mutex_unlock(&cfg80211_mutex); 691 692 flush_work(&rdev->scan_done_wk); 693 cancel_work_sync(&rdev->conn_work); 694 flush_work(&rdev->event_work); 695 } 696 EXPORT_SYMBOL(wiphy_unregister); 697 698 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 699 { 700 struct cfg80211_internal_bss *scan, *tmp; 701 rfkill_destroy(rdev->rfkill); 702 mutex_destroy(&rdev->mtx); 703 mutex_destroy(&rdev->devlist_mtx); 704 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 705 cfg80211_put_bss(&scan->pub); 706 cfg80211_rdev_free_wowlan(rdev); 707 kfree(rdev); 708 } 709 710 void wiphy_free(struct wiphy *wiphy) 711 { 712 put_device(&wiphy->dev); 713 } 714 EXPORT_SYMBOL(wiphy_free); 715 716 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 717 { 718 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 719 720 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 721 schedule_work(&rdev->rfkill_sync); 722 } 723 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 724 725 static void wdev_cleanup_work(struct work_struct *work) 726 { 727 struct wireless_dev *wdev; 728 struct cfg80211_registered_device *rdev; 729 730 wdev = container_of(work, struct wireless_dev, cleanup_work); 731 rdev = wiphy_to_dev(wdev->wiphy); 732 733 cfg80211_lock_rdev(rdev); 734 735 if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) { 736 rdev->scan_req->aborted = true; 737 ___cfg80211_scan_done(rdev, true); 738 } 739 740 if (WARN_ON(rdev->sched_scan_req && 741 rdev->sched_scan_req->dev == wdev->netdev)) { 742 __cfg80211_stop_sched_scan(rdev, false); 743 } 744 745 cfg80211_unlock_rdev(rdev); 746 747 mutex_lock(&rdev->devlist_mtx); 748 rdev->opencount--; 749 mutex_unlock(&rdev->devlist_mtx); 750 wake_up(&rdev->dev_wait); 751 752 dev_put(wdev->netdev); 753 } 754 755 static struct device_type wiphy_type = { 756 .name = "wlan", 757 }; 758 759 static int cfg80211_netdev_notifier_call(struct notifier_block * nb, 760 unsigned long state, 761 void *ndev) 762 { 763 struct net_device *dev = ndev; 764 struct wireless_dev *wdev = dev->ieee80211_ptr; 765 struct cfg80211_registered_device *rdev; 766 int ret; 767 768 if (!wdev) 769 return NOTIFY_DONE; 770 771 rdev = wiphy_to_dev(wdev->wiphy); 772 773 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 774 775 switch (state) { 776 case NETDEV_POST_INIT: 777 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 778 break; 779 case NETDEV_REGISTER: 780 /* 781 * NB: cannot take rdev->mtx here because this may be 782 * called within code protected by it when interfaces 783 * are added with nl80211. 784 */ 785 mutex_init(&wdev->mtx); 786 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work); 787 INIT_LIST_HEAD(&wdev->event_list); 788 spin_lock_init(&wdev->event_lock); 789 INIT_LIST_HEAD(&wdev->mgmt_registrations); 790 spin_lock_init(&wdev->mgmt_registrations_lock); 791 792 mutex_lock(&rdev->devlist_mtx); 793 list_add_rcu(&wdev->list, &rdev->netdev_list); 794 rdev->devlist_generation++; 795 /* can only change netns with wiphy */ 796 dev->features |= NETIF_F_NETNS_LOCAL; 797 798 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 799 "phy80211")) { 800 pr_err("failed to add phy80211 symlink to netdev!\n"); 801 } 802 wdev->netdev = dev; 803 wdev->sme_state = CFG80211_SME_IDLE; 804 mutex_unlock(&rdev->devlist_mtx); 805 #ifdef CONFIG_CFG80211_WEXT 806 wdev->wext.default_key = -1; 807 wdev->wext.default_mgmt_key = -1; 808 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 809 #endif 810 811 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 812 wdev->ps = true; 813 else 814 wdev->ps = false; 815 /* allow mac80211 to determine the timeout */ 816 wdev->ps_timeout = -1; 817 818 if (!dev->ethtool_ops) 819 dev->ethtool_ops = &cfg80211_ethtool_ops; 820 821 if ((wdev->iftype == NL80211_IFTYPE_STATION || 822 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 823 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 824 dev->priv_flags |= IFF_DONT_BRIDGE; 825 break; 826 case NETDEV_GOING_DOWN: 827 switch (wdev->iftype) { 828 case NL80211_IFTYPE_ADHOC: 829 cfg80211_leave_ibss(rdev, dev, true); 830 break; 831 case NL80211_IFTYPE_P2P_CLIENT: 832 case NL80211_IFTYPE_STATION: 833 cfg80211_lock_rdev(rdev); 834 __cfg80211_stop_sched_scan(rdev, false); 835 cfg80211_unlock_rdev(rdev); 836 837 wdev_lock(wdev); 838 #ifdef CONFIG_CFG80211_WEXT 839 kfree(wdev->wext.ie); 840 wdev->wext.ie = NULL; 841 wdev->wext.ie_len = 0; 842 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 843 #endif 844 __cfg80211_disconnect(rdev, dev, 845 WLAN_REASON_DEAUTH_LEAVING, true); 846 cfg80211_mlme_down(rdev, dev); 847 wdev_unlock(wdev); 848 break; 849 case NL80211_IFTYPE_MESH_POINT: 850 cfg80211_leave_mesh(rdev, dev); 851 break; 852 default: 853 break; 854 } 855 wdev->beacon_interval = 0; 856 break; 857 case NETDEV_DOWN: 858 dev_hold(dev); 859 queue_work(cfg80211_wq, &wdev->cleanup_work); 860 break; 861 case NETDEV_UP: 862 /* 863 * If we have a really quick DOWN/UP succession we may 864 * have this work still pending ... cancel it and see 865 * if it was pending, in which case we need to account 866 * for some of the work it would have done. 867 */ 868 if (cancel_work_sync(&wdev->cleanup_work)) { 869 mutex_lock(&rdev->devlist_mtx); 870 rdev->opencount--; 871 mutex_unlock(&rdev->devlist_mtx); 872 dev_put(dev); 873 } 874 cfg80211_lock_rdev(rdev); 875 mutex_lock(&rdev->devlist_mtx); 876 wdev_lock(wdev); 877 switch (wdev->iftype) { 878 #ifdef CONFIG_CFG80211_WEXT 879 case NL80211_IFTYPE_ADHOC: 880 cfg80211_ibss_wext_join(rdev, wdev); 881 break; 882 case NL80211_IFTYPE_STATION: 883 cfg80211_mgd_wext_connect(rdev, wdev); 884 break; 885 #endif 886 #ifdef CONFIG_MAC80211_MESH 887 case NL80211_IFTYPE_MESH_POINT: 888 { 889 /* backward compat code... */ 890 struct mesh_setup setup; 891 memcpy(&setup, &default_mesh_setup, 892 sizeof(setup)); 893 /* back compat only needed for mesh_id */ 894 setup.mesh_id = wdev->ssid; 895 setup.mesh_id_len = wdev->mesh_id_up_len; 896 if (wdev->mesh_id_up_len) 897 __cfg80211_join_mesh(rdev, dev, 898 &setup, 899 &default_mesh_config); 900 break; 901 } 902 #endif 903 default: 904 break; 905 } 906 wdev_unlock(wdev); 907 rdev->opencount++; 908 mutex_unlock(&rdev->devlist_mtx); 909 cfg80211_unlock_rdev(rdev); 910 911 /* 912 * Configure power management to the driver here so that its 913 * correctly set also after interface type changes etc. 914 */ 915 if (wdev->iftype == NL80211_IFTYPE_STATION && 916 rdev->ops->set_power_mgmt) 917 if (rdev->ops->set_power_mgmt(wdev->wiphy, dev, 918 wdev->ps, 919 wdev->ps_timeout)) { 920 /* assume this means it's off */ 921 wdev->ps = false; 922 } 923 break; 924 case NETDEV_UNREGISTER: 925 /* 926 * NB: cannot take rdev->mtx here because this may be 927 * called within code protected by it when interfaces 928 * are removed with nl80211. 929 */ 930 mutex_lock(&rdev->devlist_mtx); 931 /* 932 * It is possible to get NETDEV_UNREGISTER 933 * multiple times. To detect that, check 934 * that the interface is still on the list 935 * of registered interfaces, and only then 936 * remove and clean it up. 937 */ 938 if (!list_empty(&wdev->list)) { 939 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 940 list_del_rcu(&wdev->list); 941 rdev->devlist_generation++; 942 cfg80211_mlme_purge_registrations(wdev); 943 #ifdef CONFIG_CFG80211_WEXT 944 kfree(wdev->wext.keys); 945 #endif 946 } 947 mutex_unlock(&rdev->devlist_mtx); 948 /* 949 * synchronise (so that we won't find this netdev 950 * from other code any more) and then clear the list 951 * head so that the above code can safely check for 952 * !list_empty() to avoid double-cleanup. 953 */ 954 synchronize_rcu(); 955 INIT_LIST_HEAD(&wdev->list); 956 break; 957 case NETDEV_PRE_UP: 958 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 959 return notifier_from_errno(-EOPNOTSUPP); 960 if (rfkill_blocked(rdev->rfkill)) 961 return notifier_from_errno(-ERFKILL); 962 ret = cfg80211_can_add_interface(rdev, wdev->iftype); 963 if (ret) 964 return notifier_from_errno(ret); 965 break; 966 } 967 968 return NOTIFY_DONE; 969 } 970 971 static struct notifier_block cfg80211_netdev_notifier = { 972 .notifier_call = cfg80211_netdev_notifier_call, 973 }; 974 975 static void __net_exit cfg80211_pernet_exit(struct net *net) 976 { 977 struct cfg80211_registered_device *rdev; 978 979 rtnl_lock(); 980 mutex_lock(&cfg80211_mutex); 981 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 982 if (net_eq(wiphy_net(&rdev->wiphy), net)) 983 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 984 } 985 mutex_unlock(&cfg80211_mutex); 986 rtnl_unlock(); 987 } 988 989 static struct pernet_operations cfg80211_pernet_ops = { 990 .exit = cfg80211_pernet_exit, 991 }; 992 993 static int __init cfg80211_init(void) 994 { 995 int err; 996 997 err = register_pernet_device(&cfg80211_pernet_ops); 998 if (err) 999 goto out_fail_pernet; 1000 1001 err = wiphy_sysfs_init(); 1002 if (err) 1003 goto out_fail_sysfs; 1004 1005 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1006 if (err) 1007 goto out_fail_notifier; 1008 1009 err = nl80211_init(); 1010 if (err) 1011 goto out_fail_nl80211; 1012 1013 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1014 1015 err = regulatory_init(); 1016 if (err) 1017 goto out_fail_reg; 1018 1019 cfg80211_wq = create_singlethread_workqueue("cfg80211"); 1020 if (!cfg80211_wq) 1021 goto out_fail_wq; 1022 1023 return 0; 1024 1025 out_fail_wq: 1026 regulatory_exit(); 1027 out_fail_reg: 1028 debugfs_remove(ieee80211_debugfs_dir); 1029 out_fail_nl80211: 1030 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1031 out_fail_notifier: 1032 wiphy_sysfs_exit(); 1033 out_fail_sysfs: 1034 unregister_pernet_device(&cfg80211_pernet_ops); 1035 out_fail_pernet: 1036 return err; 1037 } 1038 subsys_initcall(cfg80211_init); 1039 1040 static void __exit cfg80211_exit(void) 1041 { 1042 debugfs_remove(ieee80211_debugfs_dir); 1043 nl80211_exit(); 1044 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1045 wiphy_sysfs_exit(); 1046 regulatory_exit(); 1047 unregister_pernet_device(&cfg80211_pernet_ops); 1048 destroy_workqueue(cfg80211_wq); 1049 } 1050 module_exit(cfg80211_exit); 1051