1 /* 2 * This is the linux wireless configuration interface. 3 * 4 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net> 5 */ 6 7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 8 9 #include <linux/if.h> 10 #include <linux/module.h> 11 #include <linux/err.h> 12 #include <linux/list.h> 13 #include <linux/slab.h> 14 #include <linux/nl80211.h> 15 #include <linux/debugfs.h> 16 #include <linux/notifier.h> 17 #include <linux/device.h> 18 #include <linux/etherdevice.h> 19 #include <linux/rtnetlink.h> 20 #include <linux/sched.h> 21 #include <net/genetlink.h> 22 #include <net/cfg80211.h> 23 #include "nl80211.h" 24 #include "core.h" 25 #include "sysfs.h" 26 #include "debugfs.h" 27 #include "wext-compat.h" 28 #include "ethtool.h" 29 #include "rdev-ops.h" 30 31 /* name for sysfs, %d is appended */ 32 #define PHY_NAME "phy" 33 34 MODULE_AUTHOR("Johannes Berg"); 35 MODULE_LICENSE("GPL"); 36 MODULE_DESCRIPTION("wireless configuration support"); 37 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME); 38 39 /* RCU-protected (and RTNL for writers) */ 40 LIST_HEAD(cfg80211_rdev_list); 41 int cfg80211_rdev_list_generation; 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 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx) 55 { 56 struct cfg80211_registered_device *result = NULL, *rdev; 57 58 ASSERT_RTNL(); 59 60 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 61 if (rdev->wiphy_idx == wiphy_idx) { 62 result = rdev; 63 break; 64 } 65 } 66 67 return result; 68 } 69 70 int get_wiphy_idx(struct wiphy *wiphy) 71 { 72 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 73 74 return rdev->wiphy_idx; 75 } 76 77 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx) 78 { 79 struct cfg80211_registered_device *rdev; 80 81 ASSERT_RTNL(); 82 83 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx); 84 if (!rdev) 85 return NULL; 86 return &rdev->wiphy; 87 } 88 89 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, 90 char *newname) 91 { 92 struct cfg80211_registered_device *rdev2; 93 int wiphy_idx, taken = -1, result, digits; 94 95 ASSERT_RTNL(); 96 97 /* prohibit calling the thing phy%d when %d is not its number */ 98 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken); 99 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) { 100 /* count number of places needed to print wiphy_idx */ 101 digits = 1; 102 while (wiphy_idx /= 10) 103 digits++; 104 /* 105 * deny the name if it is phy<idx> where <idx> is printed 106 * without leading zeroes. taken == strlen(newname) here 107 */ 108 if (taken == strlen(PHY_NAME) + digits) 109 return -EINVAL; 110 } 111 112 113 /* Ignore nop renames */ 114 if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0) 115 return 0; 116 117 /* Ensure another device does not already have this name. */ 118 list_for_each_entry(rdev2, &cfg80211_rdev_list, list) 119 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0) 120 return -EINVAL; 121 122 result = device_rename(&rdev->wiphy.dev, newname); 123 if (result) 124 return result; 125 126 if (rdev->wiphy.debugfsdir && 127 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent, 128 rdev->wiphy.debugfsdir, 129 rdev->wiphy.debugfsdir->d_parent, 130 newname)) 131 pr_err("failed to rename debugfs dir to %s!\n", newname); 132 133 nl80211_notify_dev_rename(rdev); 134 135 return 0; 136 } 137 138 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, 139 struct net *net) 140 { 141 struct wireless_dev *wdev; 142 int err = 0; 143 144 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK)) 145 return -EOPNOTSUPP; 146 147 list_for_each_entry(wdev, &rdev->wdev_list, list) { 148 if (!wdev->netdev) 149 continue; 150 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 151 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); 152 if (err) 153 break; 154 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 155 } 156 157 if (err) { 158 /* failed -- clean up to old netns */ 159 net = wiphy_net(&rdev->wiphy); 160 161 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list, 162 list) { 163 if (!wdev->netdev) 164 continue; 165 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 166 err = dev_change_net_namespace(wdev->netdev, net, 167 "wlan%d"); 168 WARN_ON(err); 169 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 170 } 171 172 return err; 173 } 174 175 wiphy_net_set(&rdev->wiphy, net); 176 177 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev)); 178 WARN_ON(err); 179 180 return 0; 181 } 182 183 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data) 184 { 185 struct cfg80211_registered_device *rdev = data; 186 187 rdev_rfkill_poll(rdev); 188 } 189 190 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev, 191 struct wireless_dev *wdev) 192 { 193 ASSERT_RTNL(); 194 195 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE)) 196 return; 197 198 if (!wdev->p2p_started) 199 return; 200 201 rdev_stop_p2p_device(rdev, wdev); 202 wdev->p2p_started = false; 203 204 rdev->opencount--; 205 206 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 207 if (WARN_ON(!rdev->scan_req->notified)) 208 rdev->scan_req->aborted = true; 209 ___cfg80211_scan_done(rdev, false); 210 } 211 } 212 213 static int cfg80211_rfkill_set_block(void *data, bool blocked) 214 { 215 struct cfg80211_registered_device *rdev = data; 216 struct wireless_dev *wdev; 217 218 if (!blocked) 219 return 0; 220 221 rtnl_lock(); 222 223 list_for_each_entry(wdev, &rdev->wdev_list, list) { 224 if (wdev->netdev) { 225 dev_close(wdev->netdev); 226 continue; 227 } 228 /* otherwise, check iftype */ 229 switch (wdev->iftype) { 230 case NL80211_IFTYPE_P2P_DEVICE: 231 cfg80211_stop_p2p_device(rdev, wdev); 232 break; 233 default: 234 break; 235 } 236 } 237 238 rtnl_unlock(); 239 240 return 0; 241 } 242 243 static void cfg80211_rfkill_sync_work(struct work_struct *work) 244 { 245 struct cfg80211_registered_device *rdev; 246 247 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync); 248 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill)); 249 } 250 251 static void cfg80211_event_work(struct work_struct *work) 252 { 253 struct cfg80211_registered_device *rdev; 254 255 rdev = container_of(work, struct cfg80211_registered_device, 256 event_work); 257 258 rtnl_lock(); 259 cfg80211_process_rdev_events(rdev); 260 rtnl_unlock(); 261 } 262 263 /* exported functions */ 264 265 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv) 266 { 267 static atomic_t wiphy_counter = ATOMIC_INIT(0); 268 269 struct cfg80211_registered_device *rdev; 270 int alloc_size; 271 272 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 273 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 274 WARN_ON(ops->connect && !ops->disconnect); 275 WARN_ON(ops->join_ibss && !ops->leave_ibss); 276 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 277 WARN_ON(ops->add_station && !ops->del_station); 278 WARN_ON(ops->add_mpath && !ops->del_mpath); 279 WARN_ON(ops->join_mesh && !ops->leave_mesh); 280 281 alloc_size = sizeof(*rdev) + sizeof_priv; 282 283 rdev = kzalloc(alloc_size, GFP_KERNEL); 284 if (!rdev) 285 return NULL; 286 287 rdev->ops = ops; 288 289 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 290 291 if (unlikely(rdev->wiphy_idx < 0)) { 292 /* ugh, wrapped! */ 293 atomic_dec(&wiphy_counter); 294 kfree(rdev); 295 return NULL; 296 } 297 298 /* atomic_inc_return makes it start at 1, make it start at 0 */ 299 rdev->wiphy_idx--; 300 301 /* give it a proper name */ 302 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 303 304 INIT_LIST_HEAD(&rdev->wdev_list); 305 INIT_LIST_HEAD(&rdev->beacon_registrations); 306 spin_lock_init(&rdev->beacon_registrations_lock); 307 spin_lock_init(&rdev->bss_lock); 308 INIT_LIST_HEAD(&rdev->bss_list); 309 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 310 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results); 311 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 312 cfg80211_dfs_channels_update_work); 313 #ifdef CONFIG_CFG80211_WEXT 314 rdev->wiphy.wext = &cfg80211_wext_handler; 315 #endif 316 317 device_initialize(&rdev->wiphy.dev); 318 rdev->wiphy.dev.class = &ieee80211_class; 319 rdev->wiphy.dev.platform_data = rdev; 320 321 #ifdef CONFIG_CFG80211_DEFAULT_PS 322 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 323 #endif 324 325 wiphy_net_set(&rdev->wiphy, &init_net); 326 327 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 328 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 329 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 330 &rdev->rfkill_ops, rdev); 331 332 if (!rdev->rfkill) { 333 kfree(rdev); 334 return NULL; 335 } 336 337 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); 338 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 339 INIT_WORK(&rdev->event_work, cfg80211_event_work); 340 341 init_waitqueue_head(&rdev->dev_wait); 342 343 /* 344 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 345 * Fragmentation and RTS threshold are disabled by default with the 346 * special -1 value. 347 */ 348 rdev->wiphy.retry_short = 7; 349 rdev->wiphy.retry_long = 4; 350 rdev->wiphy.frag_threshold = (u32) -1; 351 rdev->wiphy.rts_threshold = (u32) -1; 352 rdev->wiphy.coverage_class = 0; 353 354 return &rdev->wiphy; 355 } 356 EXPORT_SYMBOL(wiphy_new); 357 358 static int wiphy_verify_combinations(struct wiphy *wiphy) 359 { 360 const struct ieee80211_iface_combination *c; 361 int i, j; 362 363 for (i = 0; i < wiphy->n_iface_combinations; i++) { 364 u32 cnt = 0; 365 u16 all_iftypes = 0; 366 367 c = &wiphy->iface_combinations[i]; 368 369 /* 370 * Combinations with just one interface aren't real, 371 * however we make an exception for DFS. 372 */ 373 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 374 return -EINVAL; 375 376 /* Need at least one channel */ 377 if (WARN_ON(!c->num_different_channels)) 378 return -EINVAL; 379 380 /* 381 * Put a sane limit on maximum number of different 382 * channels to simplify channel accounting code. 383 */ 384 if (WARN_ON(c->num_different_channels > 385 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 386 return -EINVAL; 387 388 /* DFS only works on one channel. */ 389 if (WARN_ON(c->radar_detect_widths && 390 (c->num_different_channels > 1))) 391 return -EINVAL; 392 393 if (WARN_ON(!c->n_limits)) 394 return -EINVAL; 395 396 for (j = 0; j < c->n_limits; j++) { 397 u16 types = c->limits[j].types; 398 399 /* 400 * interface types shouldn't overlap, this is 401 * used in cfg80211_can_change_interface() 402 */ 403 if (WARN_ON(types & all_iftypes)) 404 return -EINVAL; 405 all_iftypes |= types; 406 407 if (WARN_ON(!c->limits[j].max)) 408 return -EINVAL; 409 410 /* Shouldn't list software iftypes in combinations! */ 411 if (WARN_ON(wiphy->software_iftypes & types)) 412 return -EINVAL; 413 414 /* Only a single P2P_DEVICE can be allowed */ 415 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 416 c->limits[j].max > 1)) 417 return -EINVAL; 418 419 cnt += c->limits[j].max; 420 /* 421 * Don't advertise an unsupported type 422 * in a combination. 423 */ 424 if (WARN_ON((wiphy->interface_modes & types) != types)) 425 return -EINVAL; 426 } 427 428 /* You can't even choose that many! */ 429 if (WARN_ON(cnt < c->max_interfaces)) 430 return -EINVAL; 431 } 432 433 return 0; 434 } 435 436 int wiphy_register(struct wiphy *wiphy) 437 { 438 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 439 int res; 440 enum ieee80211_band band; 441 struct ieee80211_supported_band *sband; 442 bool have_band = false; 443 int i; 444 u16 ifmodes = wiphy->interface_modes; 445 446 /* 447 * There are major locking problems in nl80211/mac80211 for CSA, 448 * disable for all drivers until this has been reworked. 449 */ 450 wiphy->flags &= ~WIPHY_FLAG_HAS_CHANNEL_SWITCH; 451 452 #ifdef CONFIG_PM 453 if (WARN_ON(wiphy->wowlan && 454 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 455 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 456 return -EINVAL; 457 if (WARN_ON(wiphy->wowlan && 458 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 459 !wiphy->wowlan->tcp)) 460 return -EINVAL; 461 #endif 462 463 if (WARN_ON(wiphy->coalesce && 464 (!wiphy->coalesce->n_rules || 465 !wiphy->coalesce->n_patterns) && 466 (!wiphy->coalesce->pattern_min_len || 467 wiphy->coalesce->pattern_min_len > 468 wiphy->coalesce->pattern_max_len))) 469 return -EINVAL; 470 471 if (WARN_ON(wiphy->ap_sme_capa && 472 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 473 return -EINVAL; 474 475 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 476 return -EINVAL; 477 478 if (WARN_ON(wiphy->addresses && 479 !is_zero_ether_addr(wiphy->perm_addr) && 480 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 481 ETH_ALEN))) 482 return -EINVAL; 483 484 if (WARN_ON(wiphy->max_acl_mac_addrs && 485 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 486 !rdev->ops->set_mac_acl))) 487 return -EINVAL; 488 489 if (wiphy->addresses) 490 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 491 492 /* sanity check ifmodes */ 493 WARN_ON(!ifmodes); 494 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 495 if (WARN_ON(ifmodes != wiphy->interface_modes)) 496 wiphy->interface_modes = ifmodes; 497 498 res = wiphy_verify_combinations(wiphy); 499 if (res) 500 return res; 501 502 /* sanity check supported bands/channels */ 503 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 504 sband = wiphy->bands[band]; 505 if (!sband) 506 continue; 507 508 sband->band = band; 509 if (WARN_ON(!sband->n_channels)) 510 return -EINVAL; 511 /* 512 * on 60gHz band, there are no legacy rates, so 513 * n_bitrates is 0 514 */ 515 if (WARN_ON(band != IEEE80211_BAND_60GHZ && 516 !sband->n_bitrates)) 517 return -EINVAL; 518 519 /* 520 * Since cfg80211_disable_40mhz_24ghz is global, we can 521 * modify the sband's ht data even if the driver uses a 522 * global structure for that. 523 */ 524 if (cfg80211_disable_40mhz_24ghz && 525 band == IEEE80211_BAND_2GHZ && 526 sband->ht_cap.ht_supported) { 527 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 528 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 529 } 530 531 /* 532 * Since we use a u32 for rate bitmaps in 533 * ieee80211_get_response_rate, we cannot 534 * have more than 32 legacy rates. 535 */ 536 if (WARN_ON(sband->n_bitrates > 32)) 537 return -EINVAL; 538 539 for (i = 0; i < sband->n_channels; i++) { 540 sband->channels[i].orig_flags = 541 sband->channels[i].flags; 542 sband->channels[i].orig_mag = INT_MAX; 543 sband->channels[i].orig_mpwr = 544 sband->channels[i].max_power; 545 sband->channels[i].band = band; 546 } 547 548 have_band = true; 549 } 550 551 if (!have_band) { 552 WARN_ON(1); 553 return -EINVAL; 554 } 555 556 #ifdef CONFIG_PM 557 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 558 (!rdev->wiphy.wowlan->pattern_min_len || 559 rdev->wiphy.wowlan->pattern_min_len > 560 rdev->wiphy.wowlan->pattern_max_len))) 561 return -EINVAL; 562 #endif 563 564 /* check and set up bitrates */ 565 ieee80211_set_bitrate_flags(wiphy); 566 567 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 568 569 rtnl_lock(); 570 res = device_add(&rdev->wiphy.dev); 571 if (res) { 572 rtnl_unlock(); 573 return res; 574 } 575 576 /* set up regulatory info */ 577 wiphy_regulatory_register(wiphy); 578 579 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 580 cfg80211_rdev_list_generation++; 581 582 /* add to debugfs */ 583 rdev->wiphy.debugfsdir = 584 debugfs_create_dir(wiphy_name(&rdev->wiphy), 585 ieee80211_debugfs_dir); 586 if (IS_ERR(rdev->wiphy.debugfsdir)) 587 rdev->wiphy.debugfsdir = NULL; 588 589 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 590 struct regulatory_request request; 591 592 request.wiphy_idx = get_wiphy_idx(wiphy); 593 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 594 request.alpha2[0] = '9'; 595 request.alpha2[1] = '9'; 596 597 nl80211_send_reg_change_event(&request); 598 } 599 600 cfg80211_debugfs_rdev_add(rdev); 601 602 rdev->wiphy.registered = true; 603 rtnl_unlock(); 604 605 res = rfkill_register(rdev->rfkill); 606 if (res) { 607 rfkill_destroy(rdev->rfkill); 608 rdev->rfkill = NULL; 609 wiphy_unregister(&rdev->wiphy); 610 return res; 611 } 612 613 return 0; 614 } 615 EXPORT_SYMBOL(wiphy_register); 616 617 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 618 { 619 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 620 621 if (!rdev->ops->rfkill_poll) 622 return; 623 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 624 rfkill_resume_polling(rdev->rfkill); 625 } 626 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 627 628 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 629 { 630 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 631 632 rfkill_pause_polling(rdev->rfkill); 633 } 634 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 635 636 void wiphy_unregister(struct wiphy *wiphy) 637 { 638 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 639 640 wait_event(rdev->dev_wait, ({ 641 int __count; 642 rtnl_lock(); 643 __count = rdev->opencount; 644 rtnl_unlock(); 645 __count == 0; })); 646 647 if (rdev->rfkill) 648 rfkill_unregister(rdev->rfkill); 649 650 rtnl_lock(); 651 rdev->wiphy.registered = false; 652 653 BUG_ON(!list_empty(&rdev->wdev_list)); 654 655 /* 656 * First remove the hardware from everywhere, this makes 657 * it impossible to find from userspace. 658 */ 659 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 660 list_del_rcu(&rdev->list); 661 synchronize_rcu(); 662 663 /* 664 * If this device got a regulatory hint tell core its 665 * free to listen now to a new shiny device regulatory hint 666 */ 667 wiphy_regulatory_deregister(wiphy); 668 669 cfg80211_rdev_list_generation++; 670 device_del(&rdev->wiphy.dev); 671 672 rtnl_unlock(); 673 674 flush_work(&rdev->scan_done_wk); 675 cancel_work_sync(&rdev->conn_work); 676 flush_work(&rdev->event_work); 677 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 678 679 #ifdef CONFIG_PM 680 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 681 rdev_set_wakeup(rdev, false); 682 #endif 683 cfg80211_rdev_free_wowlan(rdev); 684 cfg80211_rdev_free_coalesce(rdev); 685 } 686 EXPORT_SYMBOL(wiphy_unregister); 687 688 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 689 { 690 struct cfg80211_internal_bss *scan, *tmp; 691 struct cfg80211_beacon_registration *reg, *treg; 692 rfkill_destroy(rdev->rfkill); 693 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 694 list_del(®->list); 695 kfree(reg); 696 } 697 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 698 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 699 kfree(rdev); 700 } 701 702 void wiphy_free(struct wiphy *wiphy) 703 { 704 put_device(&wiphy->dev); 705 } 706 EXPORT_SYMBOL(wiphy_free); 707 708 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 709 { 710 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 711 712 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 713 schedule_work(&rdev->rfkill_sync); 714 } 715 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 716 717 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 718 { 719 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy); 720 721 ASSERT_RTNL(); 722 723 if (WARN_ON(wdev->netdev)) 724 return; 725 726 list_del_rcu(&wdev->list); 727 rdev->devlist_generation++; 728 729 switch (wdev->iftype) { 730 case NL80211_IFTYPE_P2P_DEVICE: 731 cfg80211_stop_p2p_device(rdev, wdev); 732 break; 733 default: 734 WARN_ON_ONCE(1); 735 break; 736 } 737 } 738 EXPORT_SYMBOL(cfg80211_unregister_wdev); 739 740 static const struct device_type wiphy_type = { 741 .name = "wlan", 742 }; 743 744 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 745 enum nl80211_iftype iftype, int num) 746 { 747 ASSERT_RTNL(); 748 749 rdev->num_running_ifaces += num; 750 if (iftype == NL80211_IFTYPE_MONITOR) 751 rdev->num_running_monitor_ifaces += num; 752 } 753 754 void cfg80211_leave(struct cfg80211_registered_device *rdev, 755 struct wireless_dev *wdev) 756 { 757 struct net_device *dev = wdev->netdev; 758 759 ASSERT_RTNL(); 760 761 switch (wdev->iftype) { 762 case NL80211_IFTYPE_ADHOC: 763 cfg80211_leave_ibss(rdev, dev, true); 764 break; 765 case NL80211_IFTYPE_P2P_CLIENT: 766 case NL80211_IFTYPE_STATION: 767 if (rdev->sched_scan_req && dev == rdev->sched_scan_req->dev) 768 __cfg80211_stop_sched_scan(rdev, false); 769 770 wdev_lock(wdev); 771 #ifdef CONFIG_CFG80211_WEXT 772 kfree(wdev->wext.ie); 773 wdev->wext.ie = NULL; 774 wdev->wext.ie_len = 0; 775 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 776 #endif 777 cfg80211_disconnect(rdev, dev, 778 WLAN_REASON_DEAUTH_LEAVING, true); 779 wdev_unlock(wdev); 780 break; 781 case NL80211_IFTYPE_MESH_POINT: 782 cfg80211_leave_mesh(rdev, dev); 783 break; 784 case NL80211_IFTYPE_AP: 785 case NL80211_IFTYPE_P2P_GO: 786 cfg80211_stop_ap(rdev, dev, true); 787 break; 788 default: 789 break; 790 } 791 } 792 793 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 794 unsigned long state, void *ptr) 795 { 796 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 797 struct wireless_dev *wdev = dev->ieee80211_ptr; 798 struct cfg80211_registered_device *rdev; 799 int ret; 800 801 if (!wdev) 802 return NOTIFY_DONE; 803 804 rdev = wiphy_to_dev(wdev->wiphy); 805 806 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 807 808 switch (state) { 809 case NETDEV_POST_INIT: 810 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 811 break; 812 case NETDEV_REGISTER: 813 /* 814 * NB: cannot take rdev->mtx here because this may be 815 * called within code protected by it when interfaces 816 * are added with nl80211. 817 */ 818 mutex_init(&wdev->mtx); 819 INIT_LIST_HEAD(&wdev->event_list); 820 spin_lock_init(&wdev->event_lock); 821 INIT_LIST_HEAD(&wdev->mgmt_registrations); 822 spin_lock_init(&wdev->mgmt_registrations_lock); 823 824 wdev->identifier = ++rdev->wdev_id; 825 list_add_rcu(&wdev->list, &rdev->wdev_list); 826 rdev->devlist_generation++; 827 /* can only change netns with wiphy */ 828 dev->features |= NETIF_F_NETNS_LOCAL; 829 830 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 831 "phy80211")) { 832 pr_err("failed to add phy80211 symlink to netdev!\n"); 833 } 834 wdev->netdev = dev; 835 #ifdef CONFIG_CFG80211_WEXT 836 wdev->wext.default_key = -1; 837 wdev->wext.default_mgmt_key = -1; 838 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 839 #endif 840 841 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 842 wdev->ps = true; 843 else 844 wdev->ps = false; 845 /* allow mac80211 to determine the timeout */ 846 wdev->ps_timeout = -1; 847 848 netdev_set_default_ethtool_ops(dev, &cfg80211_ethtool_ops); 849 850 if ((wdev->iftype == NL80211_IFTYPE_STATION || 851 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 852 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 853 dev->priv_flags |= IFF_DONT_BRIDGE; 854 break; 855 case NETDEV_GOING_DOWN: 856 cfg80211_leave(rdev, wdev); 857 break; 858 case NETDEV_DOWN: 859 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 860 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 861 if (WARN_ON(!rdev->scan_req->notified)) 862 rdev->scan_req->aborted = true; 863 ___cfg80211_scan_done(rdev, false); 864 } 865 866 if (WARN_ON(rdev->sched_scan_req && 867 rdev->sched_scan_req->dev == wdev->netdev)) { 868 __cfg80211_stop_sched_scan(rdev, false); 869 } 870 871 rdev->opencount--; 872 wake_up(&rdev->dev_wait); 873 break; 874 case NETDEV_UP: 875 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 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++; 908 909 /* 910 * Configure power management to the driver here so that its 911 * correctly set also after interface type changes etc. 912 */ 913 if ((wdev->iftype == NL80211_IFTYPE_STATION || 914 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 915 rdev->ops->set_power_mgmt) 916 if (rdev_set_power_mgmt(rdev, dev, wdev->ps, 917 wdev->ps_timeout)) { 918 /* assume this means it's off */ 919 wdev->ps = false; 920 } 921 break; 922 case NETDEV_UNREGISTER: 923 /* 924 * It is possible to get NETDEV_UNREGISTER 925 * multiple times. To detect that, check 926 * that the interface is still on the list 927 * of registered interfaces, and only then 928 * remove and clean it up. 929 */ 930 if (!list_empty(&wdev->list)) { 931 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 932 list_del_rcu(&wdev->list); 933 rdev->devlist_generation++; 934 cfg80211_mlme_purge_registrations(wdev); 935 #ifdef CONFIG_CFG80211_WEXT 936 kfree(wdev->wext.keys); 937 #endif 938 } 939 /* 940 * synchronise (so that we won't find this netdev 941 * from other code any more) and then clear the list 942 * head so that the above code can safely check for 943 * !list_empty() to avoid double-cleanup. 944 */ 945 synchronize_rcu(); 946 INIT_LIST_HEAD(&wdev->list); 947 /* 948 * Ensure that all events have been processed and 949 * freed. 950 */ 951 cfg80211_process_wdev_events(wdev); 952 953 if (WARN_ON(wdev->current_bss)) { 954 cfg80211_unhold_bss(wdev->current_bss); 955 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 956 wdev->current_bss = NULL; 957 } 958 break; 959 case NETDEV_PRE_UP: 960 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 961 return notifier_from_errno(-EOPNOTSUPP); 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 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 981 if (net_eq(wiphy_net(&rdev->wiphy), net)) 982 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 983 } 984 rtnl_unlock(); 985 } 986 987 static struct pernet_operations cfg80211_pernet_ops = { 988 .exit = cfg80211_pernet_exit, 989 }; 990 991 static int __init cfg80211_init(void) 992 { 993 int err; 994 995 err = register_pernet_device(&cfg80211_pernet_ops); 996 if (err) 997 goto out_fail_pernet; 998 999 err = wiphy_sysfs_init(); 1000 if (err) 1001 goto out_fail_sysfs; 1002 1003 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1004 if (err) 1005 goto out_fail_notifier; 1006 1007 err = nl80211_init(); 1008 if (err) 1009 goto out_fail_nl80211; 1010 1011 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1012 1013 err = regulatory_init(); 1014 if (err) 1015 goto out_fail_reg; 1016 1017 cfg80211_wq = create_singlethread_workqueue("cfg80211"); 1018 if (!cfg80211_wq) { 1019 err = -ENOMEM; 1020 goto out_fail_wq; 1021 } 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