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 /* 208 * If the scan request wasn't notified as done, set it 209 * to aborted and leak it after a warning. The driver 210 * should have notified us that it ended at the latest 211 * during rdev_stop_p2p_device(). 212 */ 213 if (WARN_ON(!rdev->scan_req->notified)) 214 rdev->scan_req->aborted = true; 215 ___cfg80211_scan_done(rdev, !rdev->scan_req->notified); 216 } 217 } 218 219 static int cfg80211_rfkill_set_block(void *data, bool blocked) 220 { 221 struct cfg80211_registered_device *rdev = data; 222 struct wireless_dev *wdev; 223 224 if (!blocked) 225 return 0; 226 227 rtnl_lock(); 228 229 list_for_each_entry(wdev, &rdev->wdev_list, list) { 230 if (wdev->netdev) { 231 dev_close(wdev->netdev); 232 continue; 233 } 234 /* otherwise, check iftype */ 235 switch (wdev->iftype) { 236 case NL80211_IFTYPE_P2P_DEVICE: 237 cfg80211_stop_p2p_device(rdev, wdev); 238 break; 239 default: 240 break; 241 } 242 } 243 244 rtnl_unlock(); 245 246 return 0; 247 } 248 249 static void cfg80211_rfkill_sync_work(struct work_struct *work) 250 { 251 struct cfg80211_registered_device *rdev; 252 253 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync); 254 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill)); 255 } 256 257 static void cfg80211_event_work(struct work_struct *work) 258 { 259 struct cfg80211_registered_device *rdev; 260 261 rdev = container_of(work, struct cfg80211_registered_device, 262 event_work); 263 264 rtnl_lock(); 265 cfg80211_process_rdev_events(rdev); 266 rtnl_unlock(); 267 } 268 269 /* exported functions */ 270 271 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv) 272 { 273 static atomic_t wiphy_counter = ATOMIC_INIT(0); 274 275 struct cfg80211_registered_device *rdev; 276 int alloc_size; 277 278 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 279 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 280 WARN_ON(ops->connect && !ops->disconnect); 281 WARN_ON(ops->join_ibss && !ops->leave_ibss); 282 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 283 WARN_ON(ops->add_station && !ops->del_station); 284 WARN_ON(ops->add_mpath && !ops->del_mpath); 285 WARN_ON(ops->join_mesh && !ops->leave_mesh); 286 287 alloc_size = sizeof(*rdev) + sizeof_priv; 288 289 rdev = kzalloc(alloc_size, GFP_KERNEL); 290 if (!rdev) 291 return NULL; 292 293 rdev->ops = ops; 294 295 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 296 297 if (unlikely(rdev->wiphy_idx < 0)) { 298 /* ugh, wrapped! */ 299 atomic_dec(&wiphy_counter); 300 kfree(rdev); 301 return NULL; 302 } 303 304 /* atomic_inc_return makes it start at 1, make it start at 0 */ 305 rdev->wiphy_idx--; 306 307 /* give it a proper name */ 308 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 309 310 INIT_LIST_HEAD(&rdev->wdev_list); 311 INIT_LIST_HEAD(&rdev->beacon_registrations); 312 spin_lock_init(&rdev->beacon_registrations_lock); 313 spin_lock_init(&rdev->bss_lock); 314 INIT_LIST_HEAD(&rdev->bss_list); 315 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 316 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results); 317 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 318 cfg80211_dfs_channels_update_work); 319 #ifdef CONFIG_CFG80211_WEXT 320 rdev->wiphy.wext = &cfg80211_wext_handler; 321 #endif 322 323 device_initialize(&rdev->wiphy.dev); 324 rdev->wiphy.dev.class = &ieee80211_class; 325 rdev->wiphy.dev.platform_data = rdev; 326 327 #ifdef CONFIG_CFG80211_DEFAULT_PS 328 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 329 #endif 330 331 wiphy_net_set(&rdev->wiphy, &init_net); 332 333 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 334 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 335 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 336 &rdev->rfkill_ops, rdev); 337 338 if (!rdev->rfkill) { 339 kfree(rdev); 340 return NULL; 341 } 342 343 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); 344 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 345 INIT_WORK(&rdev->event_work, cfg80211_event_work); 346 347 init_waitqueue_head(&rdev->dev_wait); 348 349 /* 350 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 351 * Fragmentation and RTS threshold are disabled by default with the 352 * special -1 value. 353 */ 354 rdev->wiphy.retry_short = 7; 355 rdev->wiphy.retry_long = 4; 356 rdev->wiphy.frag_threshold = (u32) -1; 357 rdev->wiphy.rts_threshold = (u32) -1; 358 rdev->wiphy.coverage_class = 0; 359 360 rdev->wiphy.features = NL80211_FEATURE_SCAN_FLUSH; 361 362 return &rdev->wiphy; 363 } 364 EXPORT_SYMBOL(wiphy_new); 365 366 static int wiphy_verify_combinations(struct wiphy *wiphy) 367 { 368 const struct ieee80211_iface_combination *c; 369 int i, j; 370 371 for (i = 0; i < wiphy->n_iface_combinations; i++) { 372 u32 cnt = 0; 373 u16 all_iftypes = 0; 374 375 c = &wiphy->iface_combinations[i]; 376 377 /* 378 * Combinations with just one interface aren't real, 379 * however we make an exception for DFS. 380 */ 381 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 382 return -EINVAL; 383 384 /* Need at least one channel */ 385 if (WARN_ON(!c->num_different_channels)) 386 return -EINVAL; 387 388 /* 389 * Put a sane limit on maximum number of different 390 * channels to simplify channel accounting code. 391 */ 392 if (WARN_ON(c->num_different_channels > 393 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 394 return -EINVAL; 395 396 /* DFS only works on one channel. */ 397 if (WARN_ON(c->radar_detect_widths && 398 (c->num_different_channels > 1))) 399 return -EINVAL; 400 401 if (WARN_ON(!c->n_limits)) 402 return -EINVAL; 403 404 for (j = 0; j < c->n_limits; j++) { 405 u16 types = c->limits[j].types; 406 407 /* 408 * interface types shouldn't overlap, this is 409 * used in cfg80211_can_change_interface() 410 */ 411 if (WARN_ON(types & all_iftypes)) 412 return -EINVAL; 413 all_iftypes |= types; 414 415 if (WARN_ON(!c->limits[j].max)) 416 return -EINVAL; 417 418 /* Shouldn't list software iftypes in combinations! */ 419 if (WARN_ON(wiphy->software_iftypes & types)) 420 return -EINVAL; 421 422 /* Only a single P2P_DEVICE can be allowed */ 423 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 424 c->limits[j].max > 1)) 425 return -EINVAL; 426 427 cnt += c->limits[j].max; 428 /* 429 * Don't advertise an unsupported type 430 * in a combination. 431 */ 432 if (WARN_ON((wiphy->interface_modes & types) != types)) 433 return -EINVAL; 434 } 435 436 /* You can't even choose that many! */ 437 if (WARN_ON(cnt < c->max_interfaces)) 438 return -EINVAL; 439 } 440 441 return 0; 442 } 443 444 int wiphy_register(struct wiphy *wiphy) 445 { 446 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 447 int res; 448 enum ieee80211_band band; 449 struct ieee80211_supported_band *sband; 450 bool have_band = false; 451 int i; 452 u16 ifmodes = wiphy->interface_modes; 453 454 #ifdef CONFIG_PM 455 if (WARN_ON(wiphy->wowlan && 456 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 457 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 458 return -EINVAL; 459 if (WARN_ON(wiphy->wowlan && 460 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 461 !wiphy->wowlan->tcp)) 462 return -EINVAL; 463 #endif 464 465 if (WARN_ON(wiphy->ap_sme_capa && 466 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 467 return -EINVAL; 468 469 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 470 return -EINVAL; 471 472 if (WARN_ON(wiphy->addresses && 473 !is_zero_ether_addr(wiphy->perm_addr) && 474 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 475 ETH_ALEN))) 476 return -EINVAL; 477 478 if (WARN_ON(wiphy->max_acl_mac_addrs && 479 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 480 !rdev->ops->set_mac_acl))) 481 return -EINVAL; 482 483 if (wiphy->addresses) 484 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 485 486 /* sanity check ifmodes */ 487 WARN_ON(!ifmodes); 488 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 489 if (WARN_ON(ifmodes != wiphy->interface_modes)) 490 wiphy->interface_modes = ifmodes; 491 492 res = wiphy_verify_combinations(wiphy); 493 if (res) 494 return res; 495 496 /* sanity check supported bands/channels */ 497 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 498 sband = wiphy->bands[band]; 499 if (!sband) 500 continue; 501 502 sband->band = band; 503 if (WARN_ON(!sband->n_channels)) 504 return -EINVAL; 505 /* 506 * on 60gHz band, there are no legacy rates, so 507 * n_bitrates is 0 508 */ 509 if (WARN_ON(band != IEEE80211_BAND_60GHZ && 510 !sband->n_bitrates)) 511 return -EINVAL; 512 513 /* 514 * Since cfg80211_disable_40mhz_24ghz is global, we can 515 * modify the sband's ht data even if the driver uses a 516 * global structure for that. 517 */ 518 if (cfg80211_disable_40mhz_24ghz && 519 band == IEEE80211_BAND_2GHZ && 520 sband->ht_cap.ht_supported) { 521 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 522 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 523 } 524 525 /* 526 * Since we use a u32 for rate bitmaps in 527 * ieee80211_get_response_rate, we cannot 528 * have more than 32 legacy rates. 529 */ 530 if (WARN_ON(sband->n_bitrates > 32)) 531 return -EINVAL; 532 533 for (i = 0; i < sband->n_channels; i++) { 534 sband->channels[i].orig_flags = 535 sband->channels[i].flags; 536 sband->channels[i].orig_mag = INT_MAX; 537 sband->channels[i].orig_mpwr = 538 sband->channels[i].max_power; 539 sband->channels[i].band = band; 540 } 541 542 have_band = true; 543 } 544 545 if (!have_band) { 546 WARN_ON(1); 547 return -EINVAL; 548 } 549 550 #ifdef CONFIG_PM 551 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 552 (!rdev->wiphy.wowlan->pattern_min_len || 553 rdev->wiphy.wowlan->pattern_min_len > 554 rdev->wiphy.wowlan->pattern_max_len))) 555 return -EINVAL; 556 #endif 557 558 /* check and set up bitrates */ 559 ieee80211_set_bitrate_flags(wiphy); 560 561 562 res = device_add(&rdev->wiphy.dev); 563 if (res) 564 return res; 565 566 res = rfkill_register(rdev->rfkill); 567 if (res) { 568 device_del(&rdev->wiphy.dev); 569 return res; 570 } 571 572 rtnl_lock(); 573 /* set up regulatory info */ 574 wiphy_regulatory_register(wiphy); 575 576 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 577 cfg80211_rdev_list_generation++; 578 579 /* add to debugfs */ 580 rdev->wiphy.debugfsdir = 581 debugfs_create_dir(wiphy_name(&rdev->wiphy), 582 ieee80211_debugfs_dir); 583 if (IS_ERR(rdev->wiphy.debugfsdir)) 584 rdev->wiphy.debugfsdir = NULL; 585 586 if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { 587 struct regulatory_request request; 588 589 request.wiphy_idx = get_wiphy_idx(wiphy); 590 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 591 request.alpha2[0] = '9'; 592 request.alpha2[1] = '9'; 593 594 nl80211_send_reg_change_event(&request); 595 } 596 597 cfg80211_debugfs_rdev_add(rdev); 598 599 rdev->wiphy.registered = true; 600 rtnl_unlock(); 601 return 0; 602 } 603 EXPORT_SYMBOL(wiphy_register); 604 605 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 606 { 607 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 608 609 if (!rdev->ops->rfkill_poll) 610 return; 611 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 612 rfkill_resume_polling(rdev->rfkill); 613 } 614 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 615 616 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 617 { 618 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 619 620 rfkill_pause_polling(rdev->rfkill); 621 } 622 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 623 624 void wiphy_unregister(struct wiphy *wiphy) 625 { 626 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 627 628 wait_event(rdev->dev_wait, ({ 629 int __count; 630 rtnl_lock(); 631 __count = rdev->opencount; 632 rtnl_unlock(); 633 __count == 0; })); 634 635 rfkill_unregister(rdev->rfkill); 636 637 rtnl_lock(); 638 rdev->wiphy.registered = false; 639 640 BUG_ON(!list_empty(&rdev->wdev_list)); 641 642 /* 643 * First remove the hardware from everywhere, this makes 644 * it impossible to find from userspace. 645 */ 646 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 647 list_del_rcu(&rdev->list); 648 synchronize_rcu(); 649 650 /* 651 * If this device got a regulatory hint tell core its 652 * free to listen now to a new shiny device regulatory hint 653 */ 654 wiphy_regulatory_deregister(wiphy); 655 656 cfg80211_rdev_list_generation++; 657 device_del(&rdev->wiphy.dev); 658 659 rtnl_unlock(); 660 661 flush_work(&rdev->scan_done_wk); 662 cancel_work_sync(&rdev->conn_work); 663 flush_work(&rdev->event_work); 664 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 665 666 #ifdef CONFIG_PM 667 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 668 rdev_set_wakeup(rdev, false); 669 #endif 670 cfg80211_rdev_free_wowlan(rdev); 671 } 672 EXPORT_SYMBOL(wiphy_unregister); 673 674 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 675 { 676 struct cfg80211_internal_bss *scan, *tmp; 677 struct cfg80211_beacon_registration *reg, *treg; 678 rfkill_destroy(rdev->rfkill); 679 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 680 list_del(®->list); 681 kfree(reg); 682 } 683 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 684 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 685 kfree(rdev); 686 } 687 688 void wiphy_free(struct wiphy *wiphy) 689 { 690 put_device(&wiphy->dev); 691 } 692 EXPORT_SYMBOL(wiphy_free); 693 694 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 695 { 696 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 697 698 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 699 schedule_work(&rdev->rfkill_sync); 700 } 701 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 702 703 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 704 { 705 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy); 706 707 ASSERT_RTNL(); 708 709 if (WARN_ON(wdev->netdev)) 710 return; 711 712 list_del_rcu(&wdev->list); 713 rdev->devlist_generation++; 714 715 switch (wdev->iftype) { 716 case NL80211_IFTYPE_P2P_DEVICE: 717 cfg80211_stop_p2p_device(rdev, wdev); 718 break; 719 default: 720 WARN_ON_ONCE(1); 721 break; 722 } 723 } 724 EXPORT_SYMBOL(cfg80211_unregister_wdev); 725 726 static struct device_type wiphy_type = { 727 .name = "wlan", 728 }; 729 730 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 731 enum nl80211_iftype iftype, int num) 732 { 733 ASSERT_RTNL(); 734 735 rdev->num_running_ifaces += num; 736 if (iftype == NL80211_IFTYPE_MONITOR) 737 rdev->num_running_monitor_ifaces += num; 738 } 739 740 void cfg80211_leave(struct cfg80211_registered_device *rdev, 741 struct wireless_dev *wdev) 742 { 743 struct net_device *dev = wdev->netdev; 744 745 switch (wdev->iftype) { 746 case NL80211_IFTYPE_ADHOC: 747 cfg80211_leave_ibss(rdev, dev, true); 748 break; 749 case NL80211_IFTYPE_P2P_CLIENT: 750 case NL80211_IFTYPE_STATION: 751 __cfg80211_stop_sched_scan(rdev, false); 752 753 wdev_lock(wdev); 754 #ifdef CONFIG_CFG80211_WEXT 755 kfree(wdev->wext.ie); 756 wdev->wext.ie = NULL; 757 wdev->wext.ie_len = 0; 758 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 759 #endif 760 cfg80211_disconnect(rdev, dev, 761 WLAN_REASON_DEAUTH_LEAVING, true); 762 wdev_unlock(wdev); 763 break; 764 case NL80211_IFTYPE_MESH_POINT: 765 cfg80211_leave_mesh(rdev, dev); 766 break; 767 case NL80211_IFTYPE_AP: 768 case NL80211_IFTYPE_P2P_GO: 769 cfg80211_stop_ap(rdev, dev); 770 break; 771 default: 772 break; 773 } 774 775 wdev->beacon_interval = 0; 776 } 777 778 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 779 unsigned long state, void *ptr) 780 { 781 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 782 struct wireless_dev *wdev = dev->ieee80211_ptr; 783 struct cfg80211_registered_device *rdev; 784 int ret; 785 786 if (!wdev) 787 return NOTIFY_DONE; 788 789 rdev = wiphy_to_dev(wdev->wiphy); 790 791 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 792 793 switch (state) { 794 case NETDEV_POST_INIT: 795 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 796 break; 797 case NETDEV_REGISTER: 798 /* 799 * NB: cannot take rdev->mtx here because this may be 800 * called within code protected by it when interfaces 801 * are added with nl80211. 802 */ 803 mutex_init(&wdev->mtx); 804 INIT_LIST_HEAD(&wdev->event_list); 805 spin_lock_init(&wdev->event_lock); 806 INIT_LIST_HEAD(&wdev->mgmt_registrations); 807 spin_lock_init(&wdev->mgmt_registrations_lock); 808 809 wdev->identifier = ++rdev->wdev_id; 810 list_add_rcu(&wdev->list, &rdev->wdev_list); 811 rdev->devlist_generation++; 812 /* can only change netns with wiphy */ 813 dev->features |= NETIF_F_NETNS_LOCAL; 814 815 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 816 "phy80211")) { 817 pr_err("failed to add phy80211 symlink to netdev!\n"); 818 } 819 wdev->netdev = dev; 820 #ifdef CONFIG_CFG80211_WEXT 821 wdev->wext.default_key = -1; 822 wdev->wext.default_mgmt_key = -1; 823 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 824 #endif 825 826 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 827 wdev->ps = true; 828 else 829 wdev->ps = false; 830 /* allow mac80211 to determine the timeout */ 831 wdev->ps_timeout = -1; 832 833 netdev_set_default_ethtool_ops(dev, &cfg80211_ethtool_ops); 834 835 if ((wdev->iftype == NL80211_IFTYPE_STATION || 836 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 837 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 838 dev->priv_flags |= IFF_DONT_BRIDGE; 839 break; 840 case NETDEV_GOING_DOWN: 841 cfg80211_leave(rdev, wdev); 842 break; 843 case NETDEV_DOWN: 844 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 845 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 846 if (WARN_ON(!rdev->scan_req->notified)) 847 rdev->scan_req->aborted = true; 848 ___cfg80211_scan_done(rdev, true); 849 } 850 851 if (WARN_ON(rdev->sched_scan_req && 852 rdev->sched_scan_req->dev == wdev->netdev)) { 853 __cfg80211_stop_sched_scan(rdev, false); 854 } 855 856 rdev->opencount--; 857 wake_up(&rdev->dev_wait); 858 break; 859 case NETDEV_UP: 860 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 861 wdev_lock(wdev); 862 switch (wdev->iftype) { 863 #ifdef CONFIG_CFG80211_WEXT 864 case NL80211_IFTYPE_ADHOC: 865 cfg80211_ibss_wext_join(rdev, wdev); 866 break; 867 case NL80211_IFTYPE_STATION: 868 cfg80211_mgd_wext_connect(rdev, wdev); 869 break; 870 #endif 871 #ifdef CONFIG_MAC80211_MESH 872 case NL80211_IFTYPE_MESH_POINT: 873 { 874 /* backward compat code... */ 875 struct mesh_setup setup; 876 memcpy(&setup, &default_mesh_setup, 877 sizeof(setup)); 878 /* back compat only needed for mesh_id */ 879 setup.mesh_id = wdev->ssid; 880 setup.mesh_id_len = wdev->mesh_id_up_len; 881 if (wdev->mesh_id_up_len) 882 __cfg80211_join_mesh(rdev, dev, 883 &setup, 884 &default_mesh_config); 885 break; 886 } 887 #endif 888 default: 889 break; 890 } 891 wdev_unlock(wdev); 892 rdev->opencount++; 893 894 /* 895 * Configure power management to the driver here so that its 896 * correctly set also after interface type changes etc. 897 */ 898 if ((wdev->iftype == NL80211_IFTYPE_STATION || 899 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 900 rdev->ops->set_power_mgmt) 901 if (rdev_set_power_mgmt(rdev, dev, wdev->ps, 902 wdev->ps_timeout)) { 903 /* assume this means it's off */ 904 wdev->ps = false; 905 } 906 break; 907 case NETDEV_UNREGISTER: 908 /* 909 * It is possible to get NETDEV_UNREGISTER 910 * multiple times. To detect that, check 911 * that the interface is still on the list 912 * of registered interfaces, and only then 913 * remove and clean it up. 914 */ 915 if (!list_empty(&wdev->list)) { 916 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 917 list_del_rcu(&wdev->list); 918 rdev->devlist_generation++; 919 cfg80211_mlme_purge_registrations(wdev); 920 #ifdef CONFIG_CFG80211_WEXT 921 kfree(wdev->wext.keys); 922 #endif 923 } 924 /* 925 * synchronise (so that we won't find this netdev 926 * from other code any more) and then clear the list 927 * head so that the above code can safely check for 928 * !list_empty() to avoid double-cleanup. 929 */ 930 synchronize_rcu(); 931 INIT_LIST_HEAD(&wdev->list); 932 /* 933 * Ensure that all events have been processed and 934 * freed. 935 */ 936 cfg80211_process_wdev_events(wdev); 937 938 if (WARN_ON(wdev->current_bss)) { 939 cfg80211_unhold_bss(wdev->current_bss); 940 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 941 wdev->current_bss = NULL; 942 } 943 break; 944 case NETDEV_PRE_UP: 945 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 946 return notifier_from_errno(-EOPNOTSUPP); 947 if (rfkill_blocked(rdev->rfkill)) 948 return notifier_from_errno(-ERFKILL); 949 ret = cfg80211_can_add_interface(rdev, wdev->iftype); 950 if (ret) 951 return notifier_from_errno(ret); 952 break; 953 } 954 955 return NOTIFY_DONE; 956 } 957 958 static struct notifier_block cfg80211_netdev_notifier = { 959 .notifier_call = cfg80211_netdev_notifier_call, 960 }; 961 962 static void __net_exit cfg80211_pernet_exit(struct net *net) 963 { 964 struct cfg80211_registered_device *rdev; 965 966 rtnl_lock(); 967 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 968 if (net_eq(wiphy_net(&rdev->wiphy), net)) 969 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 970 } 971 rtnl_unlock(); 972 } 973 974 static struct pernet_operations cfg80211_pernet_ops = { 975 .exit = cfg80211_pernet_exit, 976 }; 977 978 static int __init cfg80211_init(void) 979 { 980 int err; 981 982 err = register_pernet_device(&cfg80211_pernet_ops); 983 if (err) 984 goto out_fail_pernet; 985 986 err = wiphy_sysfs_init(); 987 if (err) 988 goto out_fail_sysfs; 989 990 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 991 if (err) 992 goto out_fail_notifier; 993 994 err = nl80211_init(); 995 if (err) 996 goto out_fail_nl80211; 997 998 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 999 1000 err = regulatory_init(); 1001 if (err) 1002 goto out_fail_reg; 1003 1004 cfg80211_wq = create_singlethread_workqueue("cfg80211"); 1005 if (!cfg80211_wq) { 1006 err = -ENOMEM; 1007 goto out_fail_wq; 1008 } 1009 1010 return 0; 1011 1012 out_fail_wq: 1013 regulatory_exit(); 1014 out_fail_reg: 1015 debugfs_remove(ieee80211_debugfs_dir); 1016 out_fail_nl80211: 1017 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1018 out_fail_notifier: 1019 wiphy_sysfs_exit(); 1020 out_fail_sysfs: 1021 unregister_pernet_device(&cfg80211_pernet_ops); 1022 out_fail_pernet: 1023 return err; 1024 } 1025 subsys_initcall(cfg80211_init); 1026 1027 static void __exit cfg80211_exit(void) 1028 { 1029 debugfs_remove(ieee80211_debugfs_dir); 1030 nl80211_exit(); 1031 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1032 wiphy_sysfs_exit(); 1033 regulatory_exit(); 1034 unregister_pernet_device(&cfg80211_pernet_ops); 1035 destroy_workqueue(cfg80211_wq); 1036 } 1037 module_exit(cfg80211_exit); 1038