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_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 /* 497 * There are major locking problems in nl80211/mac80211 for CSA, 498 * disable for all drivers until this has been reworked. 499 */ 500 wiphy->flags &= ~WIPHY_FLAG_HAS_CHANNEL_SWITCH; 501 502 #ifdef CONFIG_PM 503 if (WARN_ON(wiphy->wowlan && 504 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 505 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 506 return -EINVAL; 507 if (WARN_ON(wiphy->wowlan && 508 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 509 !wiphy->wowlan->tcp)) 510 return -EINVAL; 511 #endif 512 513 if (WARN_ON(wiphy->coalesce && 514 (!wiphy->coalesce->n_rules || 515 !wiphy->coalesce->n_patterns) && 516 (!wiphy->coalesce->pattern_min_len || 517 wiphy->coalesce->pattern_min_len > 518 wiphy->coalesce->pattern_max_len))) 519 return -EINVAL; 520 521 if (WARN_ON(wiphy->ap_sme_capa && 522 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 523 return -EINVAL; 524 525 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 526 return -EINVAL; 527 528 if (WARN_ON(wiphy->addresses && 529 !is_zero_ether_addr(wiphy->perm_addr) && 530 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 531 ETH_ALEN))) 532 return -EINVAL; 533 534 if (WARN_ON(wiphy->max_acl_mac_addrs && 535 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 536 !rdev->ops->set_mac_acl))) 537 return -EINVAL; 538 539 if (wiphy->addresses) 540 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 541 542 /* sanity check ifmodes */ 543 WARN_ON(!ifmodes); 544 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 545 if (WARN_ON(ifmodes != wiphy->interface_modes)) 546 wiphy->interface_modes = ifmodes; 547 548 res = wiphy_verify_combinations(wiphy); 549 if (res) 550 return res; 551 552 /* sanity check supported bands/channels */ 553 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 554 sband = wiphy->bands[band]; 555 if (!sband) 556 continue; 557 558 sband->band = band; 559 if (WARN_ON(!sband->n_channels)) 560 return -EINVAL; 561 /* 562 * on 60gHz band, there are no legacy rates, so 563 * n_bitrates is 0 564 */ 565 if (WARN_ON(band != IEEE80211_BAND_60GHZ && 566 !sband->n_bitrates)) 567 return -EINVAL; 568 569 /* 570 * Since cfg80211_disable_40mhz_24ghz is global, we can 571 * modify the sband's ht data even if the driver uses a 572 * global structure for that. 573 */ 574 if (cfg80211_disable_40mhz_24ghz && 575 band == IEEE80211_BAND_2GHZ && 576 sband->ht_cap.ht_supported) { 577 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 578 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 579 } 580 581 /* 582 * Since we use a u32 for rate bitmaps in 583 * ieee80211_get_response_rate, we cannot 584 * have more than 32 legacy rates. 585 */ 586 if (WARN_ON(sband->n_bitrates > 32)) 587 return -EINVAL; 588 589 for (i = 0; i < sband->n_channels; i++) { 590 sband->channels[i].orig_flags = 591 sband->channels[i].flags; 592 sband->channels[i].orig_mag = INT_MAX; 593 sband->channels[i].orig_mpwr = 594 sband->channels[i].max_power; 595 sband->channels[i].band = band; 596 } 597 598 have_band = true; 599 } 600 601 if (!have_band) { 602 WARN_ON(1); 603 return -EINVAL; 604 } 605 606 #ifdef CONFIG_PM 607 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 608 (!rdev->wiphy.wowlan->pattern_min_len || 609 rdev->wiphy.wowlan->pattern_min_len > 610 rdev->wiphy.wowlan->pattern_max_len))) 611 return -EINVAL; 612 #endif 613 614 /* check and set up bitrates */ 615 ieee80211_set_bitrate_flags(wiphy); 616 617 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 618 619 rtnl_lock(); 620 res = device_add(&rdev->wiphy.dev); 621 if (res) { 622 rtnl_unlock(); 623 return res; 624 } 625 626 /* set up regulatory info */ 627 wiphy_regulatory_register(wiphy); 628 629 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 630 cfg80211_rdev_list_generation++; 631 632 /* add to debugfs */ 633 rdev->wiphy.debugfsdir = 634 debugfs_create_dir(wiphy_name(&rdev->wiphy), 635 ieee80211_debugfs_dir); 636 if (IS_ERR(rdev->wiphy.debugfsdir)) 637 rdev->wiphy.debugfsdir = NULL; 638 639 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 640 struct regulatory_request request; 641 642 request.wiphy_idx = get_wiphy_idx(wiphy); 643 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 644 request.alpha2[0] = '9'; 645 request.alpha2[1] = '9'; 646 647 nl80211_send_reg_change_event(&request); 648 } 649 650 cfg80211_debugfs_rdev_add(rdev); 651 652 rdev->wiphy.registered = true; 653 rtnl_unlock(); 654 655 res = rfkill_register(rdev->rfkill); 656 if (res) { 657 rfkill_destroy(rdev->rfkill); 658 rdev->rfkill = NULL; 659 wiphy_unregister(&rdev->wiphy); 660 return res; 661 } 662 663 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 664 665 return 0; 666 } 667 EXPORT_SYMBOL(wiphy_register); 668 669 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 670 { 671 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 672 673 if (!rdev->ops->rfkill_poll) 674 return; 675 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 676 rfkill_resume_polling(rdev->rfkill); 677 } 678 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 679 680 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 681 { 682 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 683 684 rfkill_pause_polling(rdev->rfkill); 685 } 686 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 687 688 void wiphy_unregister(struct wiphy *wiphy) 689 { 690 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 691 692 wait_event(rdev->dev_wait, ({ 693 int __count; 694 rtnl_lock(); 695 __count = rdev->opencount; 696 rtnl_unlock(); 697 __count == 0; })); 698 699 if (rdev->rfkill) 700 rfkill_unregister(rdev->rfkill); 701 702 rtnl_lock(); 703 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 704 rdev->wiphy.registered = false; 705 706 WARN_ON(!list_empty(&rdev->wdev_list)); 707 708 /* 709 * First remove the hardware from everywhere, this makes 710 * it impossible to find from userspace. 711 */ 712 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 713 list_del_rcu(&rdev->list); 714 synchronize_rcu(); 715 716 /* 717 * If this device got a regulatory hint tell core its 718 * free to listen now to a new shiny device regulatory hint 719 */ 720 wiphy_regulatory_deregister(wiphy); 721 722 cfg80211_rdev_list_generation++; 723 device_del(&rdev->wiphy.dev); 724 725 rtnl_unlock(); 726 727 flush_work(&rdev->scan_done_wk); 728 cancel_work_sync(&rdev->conn_work); 729 flush_work(&rdev->event_work); 730 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 731 flush_work(&rdev->destroy_work); 732 733 #ifdef CONFIG_PM 734 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 735 rdev_set_wakeup(rdev, false); 736 #endif 737 cfg80211_rdev_free_wowlan(rdev); 738 cfg80211_rdev_free_coalesce(rdev); 739 } 740 EXPORT_SYMBOL(wiphy_unregister); 741 742 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 743 { 744 struct cfg80211_internal_bss *scan, *tmp; 745 struct cfg80211_beacon_registration *reg, *treg; 746 rfkill_destroy(rdev->rfkill); 747 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 748 list_del(®->list); 749 kfree(reg); 750 } 751 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 752 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 753 kfree(rdev); 754 } 755 756 void wiphy_free(struct wiphy *wiphy) 757 { 758 put_device(&wiphy->dev); 759 } 760 EXPORT_SYMBOL(wiphy_free); 761 762 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 763 { 764 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 765 766 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 767 schedule_work(&rdev->rfkill_sync); 768 } 769 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 770 771 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 772 { 773 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 774 775 ASSERT_RTNL(); 776 777 if (WARN_ON(wdev->netdev)) 778 return; 779 780 list_del_rcu(&wdev->list); 781 rdev->devlist_generation++; 782 783 switch (wdev->iftype) { 784 case NL80211_IFTYPE_P2P_DEVICE: 785 cfg80211_stop_p2p_device(rdev, wdev); 786 break; 787 default: 788 WARN_ON_ONCE(1); 789 break; 790 } 791 } 792 EXPORT_SYMBOL(cfg80211_unregister_wdev); 793 794 static const struct device_type wiphy_type = { 795 .name = "wlan", 796 }; 797 798 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 799 enum nl80211_iftype iftype, int num) 800 { 801 ASSERT_RTNL(); 802 803 rdev->num_running_ifaces += num; 804 if (iftype == NL80211_IFTYPE_MONITOR) 805 rdev->num_running_monitor_ifaces += num; 806 } 807 808 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 809 struct wireless_dev *wdev) 810 { 811 struct net_device *dev = wdev->netdev; 812 813 ASSERT_RTNL(); 814 ASSERT_WDEV_LOCK(wdev); 815 816 switch (wdev->iftype) { 817 case NL80211_IFTYPE_ADHOC: 818 __cfg80211_leave_ibss(rdev, dev, true); 819 break; 820 case NL80211_IFTYPE_P2P_CLIENT: 821 case NL80211_IFTYPE_STATION: 822 if (rdev->sched_scan_req && dev == rdev->sched_scan_req->dev) 823 __cfg80211_stop_sched_scan(rdev, false); 824 825 #ifdef CONFIG_CFG80211_WEXT 826 kfree(wdev->wext.ie); 827 wdev->wext.ie = NULL; 828 wdev->wext.ie_len = 0; 829 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 830 #endif 831 cfg80211_disconnect(rdev, dev, 832 WLAN_REASON_DEAUTH_LEAVING, true); 833 break; 834 case NL80211_IFTYPE_MESH_POINT: 835 __cfg80211_leave_mesh(rdev, dev); 836 break; 837 case NL80211_IFTYPE_AP: 838 case NL80211_IFTYPE_P2P_GO: 839 __cfg80211_stop_ap(rdev, dev, true); 840 break; 841 default: 842 break; 843 } 844 } 845 846 void cfg80211_leave(struct cfg80211_registered_device *rdev, 847 struct wireless_dev *wdev) 848 { 849 wdev_lock(wdev); 850 __cfg80211_leave(rdev, wdev); 851 wdev_unlock(wdev); 852 } 853 854 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 855 gfp_t gfp) 856 { 857 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 858 struct cfg80211_event *ev; 859 unsigned long flags; 860 861 trace_cfg80211_stop_iface(wiphy, wdev); 862 863 ev = kzalloc(sizeof(*ev), gfp); 864 if (!ev) 865 return; 866 867 ev->type = EVENT_STOPPED; 868 869 spin_lock_irqsave(&wdev->event_lock, flags); 870 list_add_tail(&ev->list, &wdev->event_list); 871 spin_unlock_irqrestore(&wdev->event_lock, flags); 872 queue_work(cfg80211_wq, &rdev->event_work); 873 } 874 EXPORT_SYMBOL(cfg80211_stop_iface); 875 876 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 877 unsigned long state, void *ptr) 878 { 879 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 880 struct wireless_dev *wdev = dev->ieee80211_ptr; 881 struct cfg80211_registered_device *rdev; 882 883 if (!wdev) 884 return NOTIFY_DONE; 885 886 rdev = wiphy_to_rdev(wdev->wiphy); 887 888 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 889 890 switch (state) { 891 case NETDEV_POST_INIT: 892 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 893 break; 894 case NETDEV_REGISTER: 895 /* 896 * NB: cannot take rdev->mtx here because this may be 897 * called within code protected by it when interfaces 898 * are added with nl80211. 899 */ 900 mutex_init(&wdev->mtx); 901 INIT_LIST_HEAD(&wdev->event_list); 902 spin_lock_init(&wdev->event_lock); 903 INIT_LIST_HEAD(&wdev->mgmt_registrations); 904 spin_lock_init(&wdev->mgmt_registrations_lock); 905 906 wdev->identifier = ++rdev->wdev_id; 907 list_add_rcu(&wdev->list, &rdev->wdev_list); 908 rdev->devlist_generation++; 909 /* can only change netns with wiphy */ 910 dev->features |= NETIF_F_NETNS_LOCAL; 911 912 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 913 "phy80211")) { 914 pr_err("failed to add phy80211 symlink to netdev!\n"); 915 } 916 wdev->netdev = dev; 917 #ifdef CONFIG_CFG80211_WEXT 918 wdev->wext.default_key = -1; 919 wdev->wext.default_mgmt_key = -1; 920 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 921 #endif 922 923 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 924 wdev->ps = true; 925 else 926 wdev->ps = false; 927 /* allow mac80211 to determine the timeout */ 928 wdev->ps_timeout = -1; 929 930 netdev_set_default_ethtool_ops(dev, &cfg80211_ethtool_ops); 931 932 if ((wdev->iftype == NL80211_IFTYPE_STATION || 933 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 934 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 935 dev->priv_flags |= IFF_DONT_BRIDGE; 936 break; 937 case NETDEV_GOING_DOWN: 938 cfg80211_leave(rdev, wdev); 939 break; 940 case NETDEV_DOWN: 941 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 942 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 943 if (WARN_ON(!rdev->scan_req->notified)) 944 rdev->scan_req->aborted = true; 945 ___cfg80211_scan_done(rdev, false); 946 } 947 948 if (WARN_ON(rdev->sched_scan_req && 949 rdev->sched_scan_req->dev == wdev->netdev)) { 950 __cfg80211_stop_sched_scan(rdev, false); 951 } 952 953 rdev->opencount--; 954 wake_up(&rdev->dev_wait); 955 break; 956 case NETDEV_UP: 957 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 958 wdev_lock(wdev); 959 switch (wdev->iftype) { 960 #ifdef CONFIG_CFG80211_WEXT 961 case NL80211_IFTYPE_ADHOC: 962 cfg80211_ibss_wext_join(rdev, wdev); 963 break; 964 case NL80211_IFTYPE_STATION: 965 cfg80211_mgd_wext_connect(rdev, wdev); 966 break; 967 #endif 968 #ifdef CONFIG_MAC80211_MESH 969 case NL80211_IFTYPE_MESH_POINT: 970 { 971 /* backward compat code... */ 972 struct mesh_setup setup; 973 memcpy(&setup, &default_mesh_setup, 974 sizeof(setup)); 975 /* back compat only needed for mesh_id */ 976 setup.mesh_id = wdev->ssid; 977 setup.mesh_id_len = wdev->mesh_id_up_len; 978 if (wdev->mesh_id_up_len) 979 __cfg80211_join_mesh(rdev, dev, 980 &setup, 981 &default_mesh_config); 982 break; 983 } 984 #endif 985 default: 986 break; 987 } 988 wdev_unlock(wdev); 989 rdev->opencount++; 990 991 /* 992 * Configure power management to the driver here so that its 993 * correctly set also after interface type changes etc. 994 */ 995 if ((wdev->iftype == NL80211_IFTYPE_STATION || 996 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 997 rdev->ops->set_power_mgmt) 998 if (rdev_set_power_mgmt(rdev, dev, wdev->ps, 999 wdev->ps_timeout)) { 1000 /* assume this means it's off */ 1001 wdev->ps = false; 1002 } 1003 break; 1004 case NETDEV_UNREGISTER: 1005 /* 1006 * It is possible to get NETDEV_UNREGISTER 1007 * multiple times. To detect that, check 1008 * that the interface is still on the list 1009 * of registered interfaces, and only then 1010 * remove and clean it up. 1011 */ 1012 if (!list_empty(&wdev->list)) { 1013 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 1014 list_del_rcu(&wdev->list); 1015 rdev->devlist_generation++; 1016 cfg80211_mlme_purge_registrations(wdev); 1017 #ifdef CONFIG_CFG80211_WEXT 1018 kfree(wdev->wext.keys); 1019 #endif 1020 } 1021 /* 1022 * synchronise (so that we won't find this netdev 1023 * from other code any more) and then clear the list 1024 * head so that the above code can safely check for 1025 * !list_empty() to avoid double-cleanup. 1026 */ 1027 synchronize_rcu(); 1028 INIT_LIST_HEAD(&wdev->list); 1029 /* 1030 * Ensure that all events have been processed and 1031 * freed. 1032 */ 1033 cfg80211_process_wdev_events(wdev); 1034 1035 if (WARN_ON(wdev->current_bss)) { 1036 cfg80211_unhold_bss(wdev->current_bss); 1037 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 1038 wdev->current_bss = NULL; 1039 } 1040 break; 1041 case NETDEV_PRE_UP: 1042 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 1043 return notifier_from_errno(-EOPNOTSUPP); 1044 if (rfkill_blocked(rdev->rfkill)) 1045 return notifier_from_errno(-ERFKILL); 1046 break; 1047 default: 1048 return NOTIFY_DONE; 1049 } 1050 1051 return NOTIFY_OK; 1052 } 1053 1054 static struct notifier_block cfg80211_netdev_notifier = { 1055 .notifier_call = cfg80211_netdev_notifier_call, 1056 }; 1057 1058 static void __net_exit cfg80211_pernet_exit(struct net *net) 1059 { 1060 struct cfg80211_registered_device *rdev; 1061 1062 rtnl_lock(); 1063 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1064 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1065 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1066 } 1067 rtnl_unlock(); 1068 } 1069 1070 static struct pernet_operations cfg80211_pernet_ops = { 1071 .exit = cfg80211_pernet_exit, 1072 }; 1073 1074 static int __init cfg80211_init(void) 1075 { 1076 int err; 1077 1078 err = register_pernet_device(&cfg80211_pernet_ops); 1079 if (err) 1080 goto out_fail_pernet; 1081 1082 err = wiphy_sysfs_init(); 1083 if (err) 1084 goto out_fail_sysfs; 1085 1086 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1087 if (err) 1088 goto out_fail_notifier; 1089 1090 err = nl80211_init(); 1091 if (err) 1092 goto out_fail_nl80211; 1093 1094 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1095 1096 err = regulatory_init(); 1097 if (err) 1098 goto out_fail_reg; 1099 1100 cfg80211_wq = create_singlethread_workqueue("cfg80211"); 1101 if (!cfg80211_wq) { 1102 err = -ENOMEM; 1103 goto out_fail_wq; 1104 } 1105 1106 return 0; 1107 1108 out_fail_wq: 1109 regulatory_exit(); 1110 out_fail_reg: 1111 debugfs_remove(ieee80211_debugfs_dir); 1112 out_fail_nl80211: 1113 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1114 out_fail_notifier: 1115 wiphy_sysfs_exit(); 1116 out_fail_sysfs: 1117 unregister_pernet_device(&cfg80211_pernet_ops); 1118 out_fail_pernet: 1119 return err; 1120 } 1121 subsys_initcall(cfg80211_init); 1122 1123 static void __exit cfg80211_exit(void) 1124 { 1125 debugfs_remove(ieee80211_debugfs_dir); 1126 nl80211_exit(); 1127 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1128 wiphy_sysfs_exit(); 1129 regulatory_exit(); 1130 unregister_pernet_device(&cfg80211_pernet_ops); 1131 destroy_workqueue(cfg80211_wq); 1132 } 1133 module_exit(cfg80211_exit); 1134