1 /* 2 * This is the linux wireless configuration interface. 3 * 4 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net> 5 * Copyright 2013-2014 Intel Mobile Communications GmbH 6 */ 7 8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10 #include <linux/if.h> 11 #include <linux/module.h> 12 #include <linux/err.h> 13 #include <linux/list.h> 14 #include <linux/slab.h> 15 #include <linux/nl80211.h> 16 #include <linux/debugfs.h> 17 #include <linux/notifier.h> 18 #include <linux/device.h> 19 #include <linux/etherdevice.h> 20 #include <linux/rtnetlink.h> 21 #include <linux/sched.h> 22 #include <net/genetlink.h> 23 #include <net/cfg80211.h> 24 #include "nl80211.h" 25 #include "core.h" 26 #include "sysfs.h" 27 #include "debugfs.h" 28 #include "wext-compat.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_rdev(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_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 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 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy) 214 { 215 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 216 struct wireless_dev *wdev; 217 218 ASSERT_RTNL(); 219 220 list_for_each_entry(wdev, &rdev->wdev_list, list) { 221 if (wdev->netdev) { 222 dev_close(wdev->netdev); 223 continue; 224 } 225 /* otherwise, check iftype */ 226 switch (wdev->iftype) { 227 case NL80211_IFTYPE_P2P_DEVICE: 228 cfg80211_stop_p2p_device(rdev, wdev); 229 break; 230 default: 231 break; 232 } 233 } 234 } 235 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces); 236 237 static int cfg80211_rfkill_set_block(void *data, bool blocked) 238 { 239 struct cfg80211_registered_device *rdev = data; 240 241 if (!blocked) 242 return 0; 243 244 rtnl_lock(); 245 cfg80211_shutdown_all_interfaces(&rdev->wiphy); 246 rtnl_unlock(); 247 248 return 0; 249 } 250 251 static void cfg80211_rfkill_sync_work(struct work_struct *work) 252 { 253 struct cfg80211_registered_device *rdev; 254 255 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync); 256 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill)); 257 } 258 259 static void cfg80211_event_work(struct work_struct *work) 260 { 261 struct cfg80211_registered_device *rdev; 262 263 rdev = container_of(work, struct cfg80211_registered_device, 264 event_work); 265 266 rtnl_lock(); 267 cfg80211_process_rdev_events(rdev); 268 rtnl_unlock(); 269 } 270 271 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev) 272 { 273 struct cfg80211_iface_destroy *item; 274 275 ASSERT_RTNL(); 276 277 spin_lock_irq(&rdev->destroy_list_lock); 278 while ((item = list_first_entry_or_null(&rdev->destroy_list, 279 struct cfg80211_iface_destroy, 280 list))) { 281 struct wireless_dev *wdev, *tmp; 282 u32 nlportid = item->nlportid; 283 284 list_del(&item->list); 285 kfree(item); 286 spin_unlock_irq(&rdev->destroy_list_lock); 287 288 list_for_each_entry_safe(wdev, tmp, &rdev->wdev_list, list) { 289 if (nlportid == wdev->owner_nlportid) 290 rdev_del_virtual_intf(rdev, wdev); 291 } 292 293 spin_lock_irq(&rdev->destroy_list_lock); 294 } 295 spin_unlock_irq(&rdev->destroy_list_lock); 296 } 297 298 static void cfg80211_destroy_iface_wk(struct work_struct *work) 299 { 300 struct cfg80211_registered_device *rdev; 301 302 rdev = container_of(work, struct cfg80211_registered_device, 303 destroy_work); 304 305 rtnl_lock(); 306 cfg80211_destroy_ifaces(rdev); 307 rtnl_unlock(); 308 } 309 310 /* exported functions */ 311 312 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv) 313 { 314 static atomic_t wiphy_counter = ATOMIC_INIT(0); 315 316 struct cfg80211_registered_device *rdev; 317 int alloc_size; 318 319 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 320 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 321 WARN_ON(ops->connect && !ops->disconnect); 322 WARN_ON(ops->join_ibss && !ops->leave_ibss); 323 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 324 WARN_ON(ops->add_station && !ops->del_station); 325 WARN_ON(ops->add_mpath && !ops->del_mpath); 326 WARN_ON(ops->join_mesh && !ops->leave_mesh); 327 328 alloc_size = sizeof(*rdev) + sizeof_priv; 329 330 rdev = kzalloc(alloc_size, GFP_KERNEL); 331 if (!rdev) 332 return NULL; 333 334 rdev->ops = ops; 335 336 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 337 338 if (unlikely(rdev->wiphy_idx < 0)) { 339 /* ugh, wrapped! */ 340 atomic_dec(&wiphy_counter); 341 kfree(rdev); 342 return NULL; 343 } 344 345 /* atomic_inc_return makes it start at 1, make it start at 0 */ 346 rdev->wiphy_idx--; 347 348 /* give it a proper name */ 349 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 350 351 INIT_LIST_HEAD(&rdev->wdev_list); 352 INIT_LIST_HEAD(&rdev->beacon_registrations); 353 spin_lock_init(&rdev->beacon_registrations_lock); 354 spin_lock_init(&rdev->bss_lock); 355 INIT_LIST_HEAD(&rdev->bss_list); 356 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 357 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results); 358 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 359 cfg80211_dfs_channels_update_work); 360 #ifdef CONFIG_CFG80211_WEXT 361 rdev->wiphy.wext = &cfg80211_wext_handler; 362 #endif 363 364 device_initialize(&rdev->wiphy.dev); 365 rdev->wiphy.dev.class = &ieee80211_class; 366 rdev->wiphy.dev.platform_data = rdev; 367 368 INIT_LIST_HEAD(&rdev->destroy_list); 369 spin_lock_init(&rdev->destroy_list_lock); 370 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 371 372 #ifdef CONFIG_CFG80211_DEFAULT_PS 373 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 374 #endif 375 376 wiphy_net_set(&rdev->wiphy, &init_net); 377 378 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 379 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 380 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 381 &rdev->rfkill_ops, rdev); 382 383 if (!rdev->rfkill) { 384 kfree(rdev); 385 return NULL; 386 } 387 388 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); 389 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 390 INIT_WORK(&rdev->event_work, cfg80211_event_work); 391 392 init_waitqueue_head(&rdev->dev_wait); 393 394 /* 395 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 396 * Fragmentation and RTS threshold are disabled by default with the 397 * special -1 value. 398 */ 399 rdev->wiphy.retry_short = 7; 400 rdev->wiphy.retry_long = 4; 401 rdev->wiphy.frag_threshold = (u32) -1; 402 rdev->wiphy.rts_threshold = (u32) -1; 403 rdev->wiphy.coverage_class = 0; 404 405 rdev->wiphy.max_num_csa_counters = 1; 406 407 return &rdev->wiphy; 408 } 409 EXPORT_SYMBOL(wiphy_new); 410 411 static int wiphy_verify_combinations(struct wiphy *wiphy) 412 { 413 const struct ieee80211_iface_combination *c; 414 int i, j; 415 416 for (i = 0; i < wiphy->n_iface_combinations; i++) { 417 u32 cnt = 0; 418 u16 all_iftypes = 0; 419 420 c = &wiphy->iface_combinations[i]; 421 422 /* 423 * Combinations with just one interface aren't real, 424 * however we make an exception for DFS. 425 */ 426 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 427 return -EINVAL; 428 429 /* Need at least one channel */ 430 if (WARN_ON(!c->num_different_channels)) 431 return -EINVAL; 432 433 /* 434 * Put a sane limit on maximum number of different 435 * channels to simplify channel accounting code. 436 */ 437 if (WARN_ON(c->num_different_channels > 438 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 439 return -EINVAL; 440 441 /* DFS only works on one channel. */ 442 if (WARN_ON(c->radar_detect_widths && 443 (c->num_different_channels > 1))) 444 return -EINVAL; 445 446 if (WARN_ON(!c->n_limits)) 447 return -EINVAL; 448 449 for (j = 0; j < c->n_limits; j++) { 450 u16 types = c->limits[j].types; 451 452 /* interface types shouldn't overlap */ 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 /* Only a single P2P_DEVICE can be allowed */ 465 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 466 c->limits[j].max > 1)) 467 return -EINVAL; 468 469 cnt += c->limits[j].max; 470 /* 471 * Don't advertise an unsupported type 472 * in a combination. 473 */ 474 if (WARN_ON((wiphy->interface_modes & types) != types)) 475 return -EINVAL; 476 } 477 478 /* You can't even choose that many! */ 479 if (WARN_ON(cnt < c->max_interfaces)) 480 return -EINVAL; 481 } 482 483 return 0; 484 } 485 486 int wiphy_register(struct wiphy *wiphy) 487 { 488 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 489 int res; 490 enum ieee80211_band band; 491 struct ieee80211_supported_band *sband; 492 bool have_band = false; 493 int i; 494 u16 ifmodes = wiphy->interface_modes; 495 496 #ifdef CONFIG_PM 497 if (WARN_ON(wiphy->wowlan && 498 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 499 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 500 return -EINVAL; 501 if (WARN_ON(wiphy->wowlan && 502 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 503 !wiphy->wowlan->tcp)) 504 return -EINVAL; 505 #endif 506 507 if (WARN_ON(wiphy->coalesce && 508 (!wiphy->coalesce->n_rules || 509 !wiphy->coalesce->n_patterns) && 510 (!wiphy->coalesce->pattern_min_len || 511 wiphy->coalesce->pattern_min_len > 512 wiphy->coalesce->pattern_max_len))) 513 return -EINVAL; 514 515 if (WARN_ON(wiphy->ap_sme_capa && 516 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 517 return -EINVAL; 518 519 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 520 return -EINVAL; 521 522 if (WARN_ON(wiphy->addresses && 523 !is_zero_ether_addr(wiphy->perm_addr) && 524 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 525 ETH_ALEN))) 526 return -EINVAL; 527 528 if (WARN_ON(wiphy->max_acl_mac_addrs && 529 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 530 !rdev->ops->set_mac_acl))) 531 return -EINVAL; 532 533 if (wiphy->addresses) 534 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 535 536 /* sanity check ifmodes */ 537 WARN_ON(!ifmodes); 538 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 539 if (WARN_ON(ifmodes != wiphy->interface_modes)) 540 wiphy->interface_modes = ifmodes; 541 542 res = wiphy_verify_combinations(wiphy); 543 if (res) 544 return res; 545 546 /* sanity check supported bands/channels */ 547 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 548 sband = wiphy->bands[band]; 549 if (!sband) 550 continue; 551 552 sband->band = band; 553 if (WARN_ON(!sband->n_channels)) 554 return -EINVAL; 555 /* 556 * on 60gHz band, there are no legacy rates, so 557 * n_bitrates is 0 558 */ 559 if (WARN_ON(band != IEEE80211_BAND_60GHZ && 560 !sband->n_bitrates)) 561 return -EINVAL; 562 563 /* 564 * Since cfg80211_disable_40mhz_24ghz is global, we can 565 * modify the sband's ht data even if the driver uses a 566 * global structure for that. 567 */ 568 if (cfg80211_disable_40mhz_24ghz && 569 band == IEEE80211_BAND_2GHZ && 570 sband->ht_cap.ht_supported) { 571 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 572 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 573 } 574 575 /* 576 * Since we use a u32 for rate bitmaps in 577 * ieee80211_get_response_rate, we cannot 578 * have more than 32 legacy rates. 579 */ 580 if (WARN_ON(sband->n_bitrates > 32)) 581 return -EINVAL; 582 583 for (i = 0; i < sband->n_channels; i++) { 584 sband->channels[i].orig_flags = 585 sband->channels[i].flags; 586 sband->channels[i].orig_mag = INT_MAX; 587 sband->channels[i].orig_mpwr = 588 sband->channels[i].max_power; 589 sband->channels[i].band = band; 590 } 591 592 have_band = true; 593 } 594 595 if (!have_band) { 596 WARN_ON(1); 597 return -EINVAL; 598 } 599 600 #ifdef CONFIG_PM 601 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 602 (!rdev->wiphy.wowlan->pattern_min_len || 603 rdev->wiphy.wowlan->pattern_min_len > 604 rdev->wiphy.wowlan->pattern_max_len))) 605 return -EINVAL; 606 #endif 607 608 /* check and set up bitrates */ 609 ieee80211_set_bitrate_flags(wiphy); 610 611 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 612 613 rtnl_lock(); 614 res = device_add(&rdev->wiphy.dev); 615 if (res) { 616 rtnl_unlock(); 617 return res; 618 } 619 620 /* set up regulatory info */ 621 wiphy_regulatory_register(wiphy); 622 623 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 624 cfg80211_rdev_list_generation++; 625 626 /* add to debugfs */ 627 rdev->wiphy.debugfsdir = 628 debugfs_create_dir(wiphy_name(&rdev->wiphy), 629 ieee80211_debugfs_dir); 630 if (IS_ERR(rdev->wiphy.debugfsdir)) 631 rdev->wiphy.debugfsdir = NULL; 632 633 cfg80211_debugfs_rdev_add(rdev); 634 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 635 636 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 637 struct regulatory_request request; 638 639 request.wiphy_idx = get_wiphy_idx(wiphy); 640 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 641 request.alpha2[0] = '9'; 642 request.alpha2[1] = '9'; 643 644 nl80211_send_reg_change_event(&request); 645 } 646 647 rdev->wiphy.registered = true; 648 rtnl_unlock(); 649 650 res = rfkill_register(rdev->rfkill); 651 if (res) { 652 rfkill_destroy(rdev->rfkill); 653 rdev->rfkill = NULL; 654 wiphy_unregister(&rdev->wiphy); 655 return res; 656 } 657 658 return 0; 659 } 660 EXPORT_SYMBOL(wiphy_register); 661 662 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 663 { 664 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 665 666 if (!rdev->ops->rfkill_poll) 667 return; 668 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 669 rfkill_resume_polling(rdev->rfkill); 670 } 671 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 672 673 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 674 { 675 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 676 677 rfkill_pause_polling(rdev->rfkill); 678 } 679 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 680 681 void wiphy_unregister(struct wiphy *wiphy) 682 { 683 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 684 685 wait_event(rdev->dev_wait, ({ 686 int __count; 687 rtnl_lock(); 688 __count = rdev->opencount; 689 rtnl_unlock(); 690 __count == 0; })); 691 692 if (rdev->rfkill) 693 rfkill_unregister(rdev->rfkill); 694 695 rtnl_lock(); 696 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 697 rdev->wiphy.registered = false; 698 699 WARN_ON(!list_empty(&rdev->wdev_list)); 700 701 /* 702 * First remove the hardware from everywhere, this makes 703 * it impossible to find from userspace. 704 */ 705 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 706 list_del_rcu(&rdev->list); 707 synchronize_rcu(); 708 709 /* 710 * If this device got a regulatory hint tell core its 711 * free to listen now to a new shiny device regulatory hint 712 */ 713 wiphy_regulatory_deregister(wiphy); 714 715 cfg80211_rdev_list_generation++; 716 device_del(&rdev->wiphy.dev); 717 718 rtnl_unlock(); 719 720 flush_work(&rdev->scan_done_wk); 721 cancel_work_sync(&rdev->conn_work); 722 flush_work(&rdev->event_work); 723 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 724 flush_work(&rdev->destroy_work); 725 726 #ifdef CONFIG_PM 727 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 728 rdev_set_wakeup(rdev, false); 729 #endif 730 cfg80211_rdev_free_wowlan(rdev); 731 cfg80211_rdev_free_coalesce(rdev); 732 } 733 EXPORT_SYMBOL(wiphy_unregister); 734 735 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 736 { 737 struct cfg80211_internal_bss *scan, *tmp; 738 struct cfg80211_beacon_registration *reg, *treg; 739 rfkill_destroy(rdev->rfkill); 740 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 741 list_del(®->list); 742 kfree(reg); 743 } 744 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 745 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 746 kfree(rdev); 747 } 748 749 void wiphy_free(struct wiphy *wiphy) 750 { 751 put_device(&wiphy->dev); 752 } 753 EXPORT_SYMBOL(wiphy_free); 754 755 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 756 { 757 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 758 759 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 760 schedule_work(&rdev->rfkill_sync); 761 } 762 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 763 764 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 765 { 766 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 767 768 ASSERT_RTNL(); 769 770 if (WARN_ON(wdev->netdev)) 771 return; 772 773 list_del_rcu(&wdev->list); 774 rdev->devlist_generation++; 775 776 switch (wdev->iftype) { 777 case NL80211_IFTYPE_P2P_DEVICE: 778 cfg80211_stop_p2p_device(rdev, wdev); 779 break; 780 default: 781 WARN_ON_ONCE(1); 782 break; 783 } 784 } 785 EXPORT_SYMBOL(cfg80211_unregister_wdev); 786 787 static const struct device_type wiphy_type = { 788 .name = "wlan", 789 }; 790 791 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 792 enum nl80211_iftype iftype, int num) 793 { 794 ASSERT_RTNL(); 795 796 rdev->num_running_ifaces += num; 797 if (iftype == NL80211_IFTYPE_MONITOR) 798 rdev->num_running_monitor_ifaces += num; 799 } 800 801 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 802 struct wireless_dev *wdev) 803 { 804 struct net_device *dev = wdev->netdev; 805 806 ASSERT_RTNL(); 807 ASSERT_WDEV_LOCK(wdev); 808 809 switch (wdev->iftype) { 810 case NL80211_IFTYPE_ADHOC: 811 __cfg80211_leave_ibss(rdev, dev, true); 812 break; 813 case NL80211_IFTYPE_P2P_CLIENT: 814 case NL80211_IFTYPE_STATION: 815 if (rdev->sched_scan_req && dev == rdev->sched_scan_req->dev) 816 __cfg80211_stop_sched_scan(rdev, false); 817 818 #ifdef CONFIG_CFG80211_WEXT 819 kfree(wdev->wext.ie); 820 wdev->wext.ie = NULL; 821 wdev->wext.ie_len = 0; 822 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 823 #endif 824 cfg80211_disconnect(rdev, dev, 825 WLAN_REASON_DEAUTH_LEAVING, true); 826 break; 827 case NL80211_IFTYPE_MESH_POINT: 828 __cfg80211_leave_mesh(rdev, dev); 829 break; 830 case NL80211_IFTYPE_AP: 831 case NL80211_IFTYPE_P2P_GO: 832 __cfg80211_stop_ap(rdev, dev, true); 833 break; 834 default: 835 break; 836 } 837 } 838 839 void cfg80211_leave(struct cfg80211_registered_device *rdev, 840 struct wireless_dev *wdev) 841 { 842 wdev_lock(wdev); 843 __cfg80211_leave(rdev, wdev); 844 wdev_unlock(wdev); 845 } 846 847 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 848 gfp_t gfp) 849 { 850 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 851 struct cfg80211_event *ev; 852 unsigned long flags; 853 854 trace_cfg80211_stop_iface(wiphy, wdev); 855 856 ev = kzalloc(sizeof(*ev), gfp); 857 if (!ev) 858 return; 859 860 ev->type = EVENT_STOPPED; 861 862 spin_lock_irqsave(&wdev->event_lock, flags); 863 list_add_tail(&ev->list, &wdev->event_list); 864 spin_unlock_irqrestore(&wdev->event_lock, flags); 865 queue_work(cfg80211_wq, &rdev->event_work); 866 } 867 EXPORT_SYMBOL(cfg80211_stop_iface); 868 869 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 870 unsigned long state, void *ptr) 871 { 872 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 873 struct wireless_dev *wdev = dev->ieee80211_ptr; 874 struct cfg80211_registered_device *rdev; 875 876 if (!wdev) 877 return NOTIFY_DONE; 878 879 rdev = wiphy_to_rdev(wdev->wiphy); 880 881 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 882 883 switch (state) { 884 case NETDEV_POST_INIT: 885 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 886 break; 887 case NETDEV_REGISTER: 888 /* 889 * NB: cannot take rdev->mtx here because this may be 890 * called within code protected by it when interfaces 891 * are added with nl80211. 892 */ 893 mutex_init(&wdev->mtx); 894 INIT_LIST_HEAD(&wdev->event_list); 895 spin_lock_init(&wdev->event_lock); 896 INIT_LIST_HEAD(&wdev->mgmt_registrations); 897 spin_lock_init(&wdev->mgmt_registrations_lock); 898 899 wdev->identifier = ++rdev->wdev_id; 900 list_add_rcu(&wdev->list, &rdev->wdev_list); 901 rdev->devlist_generation++; 902 /* can only change netns with wiphy */ 903 dev->features |= NETIF_F_NETNS_LOCAL; 904 905 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 906 "phy80211")) { 907 pr_err("failed to add phy80211 symlink to netdev!\n"); 908 } 909 wdev->netdev = dev; 910 #ifdef CONFIG_CFG80211_WEXT 911 wdev->wext.default_key = -1; 912 wdev->wext.default_mgmt_key = -1; 913 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 914 #endif 915 916 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 917 wdev->ps = true; 918 else 919 wdev->ps = false; 920 /* allow mac80211 to determine the timeout */ 921 wdev->ps_timeout = -1; 922 923 if ((wdev->iftype == NL80211_IFTYPE_STATION || 924 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 925 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 926 dev->priv_flags |= IFF_DONT_BRIDGE; 927 break; 928 case NETDEV_GOING_DOWN: 929 cfg80211_leave(rdev, wdev); 930 break; 931 case NETDEV_DOWN: 932 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 933 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 934 if (WARN_ON(!rdev->scan_req->notified)) 935 rdev->scan_req->aborted = true; 936 ___cfg80211_scan_done(rdev, false); 937 } 938 939 if (WARN_ON(rdev->sched_scan_req && 940 rdev->sched_scan_req->dev == wdev->netdev)) { 941 __cfg80211_stop_sched_scan(rdev, false); 942 } 943 944 rdev->opencount--; 945 wake_up(&rdev->dev_wait); 946 break; 947 case NETDEV_UP: 948 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 949 wdev_lock(wdev); 950 switch (wdev->iftype) { 951 #ifdef CONFIG_CFG80211_WEXT 952 case NL80211_IFTYPE_ADHOC: 953 cfg80211_ibss_wext_join(rdev, wdev); 954 break; 955 case NL80211_IFTYPE_STATION: 956 cfg80211_mgd_wext_connect(rdev, wdev); 957 break; 958 #endif 959 #ifdef CONFIG_MAC80211_MESH 960 case NL80211_IFTYPE_MESH_POINT: 961 { 962 /* backward compat code... */ 963 struct mesh_setup setup; 964 memcpy(&setup, &default_mesh_setup, 965 sizeof(setup)); 966 /* back compat only needed for mesh_id */ 967 setup.mesh_id = wdev->ssid; 968 setup.mesh_id_len = wdev->mesh_id_up_len; 969 if (wdev->mesh_id_up_len) 970 __cfg80211_join_mesh(rdev, dev, 971 &setup, 972 &default_mesh_config); 973 break; 974 } 975 #endif 976 default: 977 break; 978 } 979 wdev_unlock(wdev); 980 rdev->opencount++; 981 982 /* 983 * Configure power management to the driver here so that its 984 * correctly set also after interface type changes etc. 985 */ 986 if ((wdev->iftype == NL80211_IFTYPE_STATION || 987 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 988 rdev->ops->set_power_mgmt) 989 if (rdev_set_power_mgmt(rdev, dev, wdev->ps, 990 wdev->ps_timeout)) { 991 /* assume this means it's off */ 992 wdev->ps = false; 993 } 994 break; 995 case NETDEV_UNREGISTER: 996 /* 997 * It is possible to get NETDEV_UNREGISTER 998 * multiple times. To detect that, check 999 * that the interface is still on the list 1000 * of registered interfaces, and only then 1001 * remove and clean it up. 1002 */ 1003 if (!list_empty(&wdev->list)) { 1004 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 1005 list_del_rcu(&wdev->list); 1006 rdev->devlist_generation++; 1007 cfg80211_mlme_purge_registrations(wdev); 1008 #ifdef CONFIG_CFG80211_WEXT 1009 kzfree(wdev->wext.keys); 1010 #endif 1011 } 1012 /* 1013 * synchronise (so that we won't find this netdev 1014 * from other code any more) and then clear the list 1015 * head so that the above code can safely check for 1016 * !list_empty() to avoid double-cleanup. 1017 */ 1018 synchronize_rcu(); 1019 INIT_LIST_HEAD(&wdev->list); 1020 /* 1021 * Ensure that all events have been processed and 1022 * freed. 1023 */ 1024 cfg80211_process_wdev_events(wdev); 1025 1026 if (WARN_ON(wdev->current_bss)) { 1027 cfg80211_unhold_bss(wdev->current_bss); 1028 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 1029 wdev->current_bss = NULL; 1030 } 1031 break; 1032 case NETDEV_PRE_UP: 1033 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 1034 return notifier_from_errno(-EOPNOTSUPP); 1035 if (rfkill_blocked(rdev->rfkill)) 1036 return notifier_from_errno(-ERFKILL); 1037 break; 1038 default: 1039 return NOTIFY_DONE; 1040 } 1041 1042 return NOTIFY_OK; 1043 } 1044 1045 static struct notifier_block cfg80211_netdev_notifier = { 1046 .notifier_call = cfg80211_netdev_notifier_call, 1047 }; 1048 1049 static void __net_exit cfg80211_pernet_exit(struct net *net) 1050 { 1051 struct cfg80211_registered_device *rdev; 1052 1053 rtnl_lock(); 1054 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1055 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1056 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1057 } 1058 rtnl_unlock(); 1059 } 1060 1061 static struct pernet_operations cfg80211_pernet_ops = { 1062 .exit = cfg80211_pernet_exit, 1063 }; 1064 1065 static int __init cfg80211_init(void) 1066 { 1067 int err; 1068 1069 err = register_pernet_device(&cfg80211_pernet_ops); 1070 if (err) 1071 goto out_fail_pernet; 1072 1073 err = wiphy_sysfs_init(); 1074 if (err) 1075 goto out_fail_sysfs; 1076 1077 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1078 if (err) 1079 goto out_fail_notifier; 1080 1081 err = nl80211_init(); 1082 if (err) 1083 goto out_fail_nl80211; 1084 1085 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1086 1087 err = regulatory_init(); 1088 if (err) 1089 goto out_fail_reg; 1090 1091 cfg80211_wq = create_singlethread_workqueue("cfg80211"); 1092 if (!cfg80211_wq) { 1093 err = -ENOMEM; 1094 goto out_fail_wq; 1095 } 1096 1097 return 0; 1098 1099 out_fail_wq: 1100 regulatory_exit(); 1101 out_fail_reg: 1102 debugfs_remove(ieee80211_debugfs_dir); 1103 out_fail_nl80211: 1104 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1105 out_fail_notifier: 1106 wiphy_sysfs_exit(); 1107 out_fail_sysfs: 1108 unregister_pernet_device(&cfg80211_pernet_ops); 1109 out_fail_pernet: 1110 return err; 1111 } 1112 subsys_initcall(cfg80211_init); 1113 1114 static void __exit cfg80211_exit(void) 1115 { 1116 debugfs_remove(ieee80211_debugfs_dir); 1117 nl80211_exit(); 1118 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1119 wiphy_sysfs_exit(); 1120 regulatory_exit(); 1121 unregister_pernet_device(&cfg80211_pernet_ops); 1122 destroy_workqueue(cfg80211_wq); 1123 } 1124 module_exit(cfg80211_exit); 1125