1 /* 2 * This is the linux wireless configuration interface. 3 * 4 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net> 5 */ 6 7 #include <linux/if.h> 8 #include <linux/module.h> 9 #include <linux/err.h> 10 #include <linux/list.h> 11 #include <linux/nl80211.h> 12 #include <linux/debugfs.h> 13 #include <linux/notifier.h> 14 #include <linux/device.h> 15 #include <linux/etherdevice.h> 16 #include <linux/rtnetlink.h> 17 #include <linux/sched.h> 18 #include <net/genetlink.h> 19 #include <net/cfg80211.h> 20 #include "nl80211.h" 21 #include "core.h" 22 #include "sysfs.h" 23 #include "debugfs.h" 24 #include "wext-compat.h" 25 #include "ethtool.h" 26 27 /* name for sysfs, %d is appended */ 28 #define PHY_NAME "phy" 29 30 MODULE_AUTHOR("Johannes Berg"); 31 MODULE_LICENSE("GPL"); 32 MODULE_DESCRIPTION("wireless configuration support"); 33 34 /* RCU-protected (and cfg80211_mutex for writers) */ 35 LIST_HEAD(cfg80211_rdev_list); 36 int cfg80211_rdev_list_generation; 37 38 DEFINE_MUTEX(cfg80211_mutex); 39 40 /* for debugfs */ 41 static struct dentry *ieee80211_debugfs_dir; 42 43 /* for the cleanup, scan and event works */ 44 struct workqueue_struct *cfg80211_wq; 45 46 /* requires cfg80211_mutex to be held! */ 47 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx) 48 { 49 struct cfg80211_registered_device *result = NULL, *rdev; 50 51 if (!wiphy_idx_valid(wiphy_idx)) 52 return NULL; 53 54 assert_cfg80211_lock(); 55 56 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 57 if (rdev->wiphy_idx == wiphy_idx) { 58 result = rdev; 59 break; 60 } 61 } 62 63 return result; 64 } 65 66 int get_wiphy_idx(struct wiphy *wiphy) 67 { 68 struct cfg80211_registered_device *rdev; 69 if (!wiphy) 70 return WIPHY_IDX_STALE; 71 rdev = wiphy_to_dev(wiphy); 72 return rdev->wiphy_idx; 73 } 74 75 /* requires cfg80211_rdev_mutex to be held! */ 76 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx) 77 { 78 struct cfg80211_registered_device *rdev; 79 80 if (!wiphy_idx_valid(wiphy_idx)) 81 return NULL; 82 83 assert_cfg80211_lock(); 84 85 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx); 86 if (!rdev) 87 return NULL; 88 return &rdev->wiphy; 89 } 90 91 /* requires cfg80211_mutex to be held! */ 92 struct cfg80211_registered_device * 93 __cfg80211_rdev_from_info(struct genl_info *info) 94 { 95 int ifindex; 96 struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL; 97 struct net_device *dev; 98 int err = -EINVAL; 99 100 assert_cfg80211_lock(); 101 102 if (info->attrs[NL80211_ATTR_WIPHY]) { 103 bywiphyidx = cfg80211_rdev_by_wiphy_idx( 104 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY])); 105 err = -ENODEV; 106 } 107 108 if (info->attrs[NL80211_ATTR_IFINDEX]) { 109 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]); 110 dev = dev_get_by_index(genl_info_net(info), ifindex); 111 if (dev) { 112 if (dev->ieee80211_ptr) 113 byifidx = 114 wiphy_to_dev(dev->ieee80211_ptr->wiphy); 115 dev_put(dev); 116 } 117 err = -ENODEV; 118 } 119 120 if (bywiphyidx && byifidx) { 121 if (bywiphyidx != byifidx) 122 return ERR_PTR(-EINVAL); 123 else 124 return bywiphyidx; /* == byifidx */ 125 } 126 if (bywiphyidx) 127 return bywiphyidx; 128 129 if (byifidx) 130 return byifidx; 131 132 return ERR_PTR(err); 133 } 134 135 struct cfg80211_registered_device * 136 cfg80211_get_dev_from_info(struct genl_info *info) 137 { 138 struct cfg80211_registered_device *rdev; 139 140 mutex_lock(&cfg80211_mutex); 141 rdev = __cfg80211_rdev_from_info(info); 142 143 /* if it is not an error we grab the lock on 144 * it to assure it won't be going away while 145 * we operate on it */ 146 if (!IS_ERR(rdev)) 147 mutex_lock(&rdev->mtx); 148 149 mutex_unlock(&cfg80211_mutex); 150 151 return rdev; 152 } 153 154 struct cfg80211_registered_device * 155 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) 156 { 157 struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV); 158 struct net_device *dev; 159 160 mutex_lock(&cfg80211_mutex); 161 dev = dev_get_by_index(net, ifindex); 162 if (!dev) 163 goto out; 164 if (dev->ieee80211_ptr) { 165 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy); 166 mutex_lock(&rdev->mtx); 167 } else 168 rdev = ERR_PTR(-ENODEV); 169 dev_put(dev); 170 out: 171 mutex_unlock(&cfg80211_mutex); 172 return rdev; 173 } 174 175 /* requires cfg80211_mutex to be held */ 176 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, 177 char *newname) 178 { 179 struct cfg80211_registered_device *rdev2; 180 int wiphy_idx, taken = -1, result, digits; 181 182 assert_cfg80211_lock(); 183 184 /* prohibit calling the thing phy%d when %d is not its number */ 185 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken); 186 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) { 187 /* count number of places needed to print wiphy_idx */ 188 digits = 1; 189 while (wiphy_idx /= 10) 190 digits++; 191 /* 192 * deny the name if it is phy<idx> where <idx> is printed 193 * without leading zeroes. taken == strlen(newname) here 194 */ 195 if (taken == strlen(PHY_NAME) + digits) 196 return -EINVAL; 197 } 198 199 200 /* Ignore nop renames */ 201 if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0) 202 return 0; 203 204 /* Ensure another device does not already have this name. */ 205 list_for_each_entry(rdev2, &cfg80211_rdev_list, list) 206 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0) 207 return -EINVAL; 208 209 result = device_rename(&rdev->wiphy.dev, newname); 210 if (result) 211 return result; 212 213 if (rdev->wiphy.debugfsdir && 214 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent, 215 rdev->wiphy.debugfsdir, 216 rdev->wiphy.debugfsdir->d_parent, 217 newname)) 218 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n", 219 newname); 220 221 nl80211_notify_dev_rename(rdev); 222 223 return 0; 224 } 225 226 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, 227 struct net *net) 228 { 229 struct wireless_dev *wdev; 230 int err = 0; 231 232 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK)) 233 return -EOPNOTSUPP; 234 235 list_for_each_entry(wdev, &rdev->netdev_list, list) { 236 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 237 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); 238 if (err) 239 break; 240 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 241 } 242 243 if (err) { 244 /* failed -- clean up to old netns */ 245 net = wiphy_net(&rdev->wiphy); 246 247 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list, 248 list) { 249 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 250 err = dev_change_net_namespace(wdev->netdev, net, 251 "wlan%d"); 252 WARN_ON(err); 253 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 254 } 255 } 256 257 wiphy_net_set(&rdev->wiphy, net); 258 259 return err; 260 } 261 262 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data) 263 { 264 struct cfg80211_registered_device *rdev = data; 265 266 rdev->ops->rfkill_poll(&rdev->wiphy); 267 } 268 269 static int cfg80211_rfkill_set_block(void *data, bool blocked) 270 { 271 struct cfg80211_registered_device *rdev = data; 272 struct wireless_dev *wdev; 273 274 if (!blocked) 275 return 0; 276 277 rtnl_lock(); 278 mutex_lock(&rdev->devlist_mtx); 279 280 list_for_each_entry(wdev, &rdev->netdev_list, list) 281 dev_close(wdev->netdev); 282 283 mutex_unlock(&rdev->devlist_mtx); 284 rtnl_unlock(); 285 286 return 0; 287 } 288 289 static void cfg80211_rfkill_sync_work(struct work_struct *work) 290 { 291 struct cfg80211_registered_device *rdev; 292 293 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync); 294 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill)); 295 } 296 297 static void cfg80211_event_work(struct work_struct *work) 298 { 299 struct cfg80211_registered_device *rdev; 300 301 rdev = container_of(work, struct cfg80211_registered_device, 302 event_work); 303 304 rtnl_lock(); 305 cfg80211_lock_rdev(rdev); 306 307 cfg80211_process_rdev_events(rdev); 308 cfg80211_unlock_rdev(rdev); 309 rtnl_unlock(); 310 } 311 312 /* exported functions */ 313 314 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv) 315 { 316 static int wiphy_counter; 317 318 struct cfg80211_registered_device *rdev; 319 int alloc_size; 320 321 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 322 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 323 WARN_ON(ops->connect && !ops->disconnect); 324 WARN_ON(ops->join_ibss && !ops->leave_ibss); 325 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 326 WARN_ON(ops->add_station && !ops->del_station); 327 WARN_ON(ops->add_mpath && !ops->del_mpath); 328 329 alloc_size = sizeof(*rdev) + sizeof_priv; 330 331 rdev = kzalloc(alloc_size, GFP_KERNEL); 332 if (!rdev) 333 return NULL; 334 335 rdev->ops = ops; 336 337 mutex_lock(&cfg80211_mutex); 338 339 rdev->wiphy_idx = wiphy_counter++; 340 341 if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) { 342 wiphy_counter--; 343 mutex_unlock(&cfg80211_mutex); 344 /* ugh, wrapped! */ 345 kfree(rdev); 346 return NULL; 347 } 348 349 mutex_unlock(&cfg80211_mutex); 350 351 /* give it a proper name */ 352 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 353 354 mutex_init(&rdev->mtx); 355 mutex_init(&rdev->devlist_mtx); 356 INIT_LIST_HEAD(&rdev->netdev_list); 357 spin_lock_init(&rdev->bss_lock); 358 INIT_LIST_HEAD(&rdev->bss_list); 359 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 360 361 #ifdef CONFIG_CFG80211_WEXT 362 rdev->wiphy.wext = &cfg80211_wext_handler; 363 #endif 364 365 device_initialize(&rdev->wiphy.dev); 366 rdev->wiphy.dev.class = &ieee80211_class; 367 rdev->wiphy.dev.platform_data = rdev; 368 369 #ifdef CONFIG_CFG80211_DEFAULT_PS 370 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 371 #endif 372 373 wiphy_net_set(&rdev->wiphy, &init_net); 374 375 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 376 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 377 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 378 &rdev->rfkill_ops, rdev); 379 380 if (!rdev->rfkill) { 381 kfree(rdev); 382 return NULL; 383 } 384 385 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); 386 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 387 INIT_WORK(&rdev->event_work, cfg80211_event_work); 388 389 init_waitqueue_head(&rdev->dev_wait); 390 391 /* 392 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 393 * Fragmentation and RTS threshold are disabled by default with the 394 * special -1 value. 395 */ 396 rdev->wiphy.retry_short = 7; 397 rdev->wiphy.retry_long = 4; 398 rdev->wiphy.frag_threshold = (u32) -1; 399 rdev->wiphy.rts_threshold = (u32) -1; 400 rdev->wiphy.coverage_class = 0; 401 402 return &rdev->wiphy; 403 } 404 EXPORT_SYMBOL(wiphy_new); 405 406 int wiphy_register(struct wiphy *wiphy) 407 { 408 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 409 int res; 410 enum ieee80211_band band; 411 struct ieee80211_supported_band *sband; 412 bool have_band = false; 413 int i; 414 u16 ifmodes = wiphy->interface_modes; 415 416 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 417 return -EINVAL; 418 419 if (WARN_ON(wiphy->addresses && 420 !is_zero_ether_addr(wiphy->perm_addr) && 421 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 422 ETH_ALEN))) 423 return -EINVAL; 424 425 if (wiphy->addresses) 426 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 427 428 /* sanity check ifmodes */ 429 WARN_ON(!ifmodes); 430 ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1; 431 if (WARN_ON(ifmodes != wiphy->interface_modes)) 432 wiphy->interface_modes = ifmodes; 433 434 /* sanity check supported bands/channels */ 435 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 436 sband = wiphy->bands[band]; 437 if (!sband) 438 continue; 439 440 sband->band = band; 441 442 if (WARN_ON(!sband->n_channels || !sband->n_bitrates)) 443 return -EINVAL; 444 445 /* 446 * Since we use a u32 for rate bitmaps in 447 * ieee80211_get_response_rate, we cannot 448 * have more than 32 legacy rates. 449 */ 450 if (WARN_ON(sband->n_bitrates > 32)) 451 return -EINVAL; 452 453 for (i = 0; i < sband->n_channels; i++) { 454 sband->channels[i].orig_flags = 455 sband->channels[i].flags; 456 sband->channels[i].orig_mag = 457 sband->channels[i].max_antenna_gain; 458 sband->channels[i].orig_mpwr = 459 sband->channels[i].max_power; 460 sband->channels[i].band = band; 461 } 462 463 have_band = true; 464 } 465 466 if (!have_band) { 467 WARN_ON(1); 468 return -EINVAL; 469 } 470 471 /* check and set up bitrates */ 472 ieee80211_set_bitrate_flags(wiphy); 473 474 res = device_add(&rdev->wiphy.dev); 475 if (res) 476 return res; 477 478 res = rfkill_register(rdev->rfkill); 479 if (res) 480 goto out_rm_dev; 481 482 mutex_lock(&cfg80211_mutex); 483 484 /* set up regulatory info */ 485 wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE); 486 487 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 488 cfg80211_rdev_list_generation++; 489 490 mutex_unlock(&cfg80211_mutex); 491 492 /* add to debugfs */ 493 rdev->wiphy.debugfsdir = 494 debugfs_create_dir(wiphy_name(&rdev->wiphy), 495 ieee80211_debugfs_dir); 496 if (IS_ERR(rdev->wiphy.debugfsdir)) 497 rdev->wiphy.debugfsdir = NULL; 498 499 if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { 500 struct regulatory_request request; 501 502 request.wiphy_idx = get_wiphy_idx(wiphy); 503 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 504 request.alpha2[0] = '9'; 505 request.alpha2[1] = '9'; 506 507 nl80211_send_reg_change_event(&request); 508 } 509 510 cfg80211_debugfs_rdev_add(rdev); 511 512 return 0; 513 514 out_rm_dev: 515 device_del(&rdev->wiphy.dev); 516 return res; 517 } 518 EXPORT_SYMBOL(wiphy_register); 519 520 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 521 { 522 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 523 524 if (!rdev->ops->rfkill_poll) 525 return; 526 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 527 rfkill_resume_polling(rdev->rfkill); 528 } 529 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 530 531 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 532 { 533 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 534 535 rfkill_pause_polling(rdev->rfkill); 536 } 537 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 538 539 void wiphy_unregister(struct wiphy *wiphy) 540 { 541 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 542 543 rfkill_unregister(rdev->rfkill); 544 545 /* protect the device list */ 546 mutex_lock(&cfg80211_mutex); 547 548 wait_event(rdev->dev_wait, ({ 549 int __count; 550 mutex_lock(&rdev->devlist_mtx); 551 __count = rdev->opencount; 552 mutex_unlock(&rdev->devlist_mtx); 553 __count == 0;})); 554 555 mutex_lock(&rdev->devlist_mtx); 556 BUG_ON(!list_empty(&rdev->netdev_list)); 557 mutex_unlock(&rdev->devlist_mtx); 558 559 /* 560 * First remove the hardware from everywhere, this makes 561 * it impossible to find from userspace. 562 */ 563 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 564 list_del_rcu(&rdev->list); 565 synchronize_rcu(); 566 567 /* 568 * Try to grab rdev->mtx. If a command is still in progress, 569 * hopefully the driver will refuse it since it's tearing 570 * down the device already. We wait for this command to complete 571 * before unlinking the item from the list. 572 * Note: as codified by the BUG_ON above we cannot get here if 573 * a virtual interface is still present. Hence, we can only get 574 * to lock contention here if userspace issues a command that 575 * identified the hardware by wiphy index. 576 */ 577 cfg80211_lock_rdev(rdev); 578 /* nothing */ 579 cfg80211_unlock_rdev(rdev); 580 581 /* If this device got a regulatory hint tell core its 582 * free to listen now to a new shiny device regulatory hint */ 583 reg_device_remove(wiphy); 584 585 cfg80211_rdev_list_generation++; 586 device_del(&rdev->wiphy.dev); 587 588 mutex_unlock(&cfg80211_mutex); 589 590 flush_work(&rdev->scan_done_wk); 591 cancel_work_sync(&rdev->conn_work); 592 flush_work(&rdev->event_work); 593 } 594 EXPORT_SYMBOL(wiphy_unregister); 595 596 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 597 { 598 struct cfg80211_internal_bss *scan, *tmp; 599 rfkill_destroy(rdev->rfkill); 600 mutex_destroy(&rdev->mtx); 601 mutex_destroy(&rdev->devlist_mtx); 602 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 603 cfg80211_put_bss(&scan->pub); 604 kfree(rdev); 605 } 606 607 void wiphy_free(struct wiphy *wiphy) 608 { 609 put_device(&wiphy->dev); 610 } 611 EXPORT_SYMBOL(wiphy_free); 612 613 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 614 { 615 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 616 617 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 618 schedule_work(&rdev->rfkill_sync); 619 } 620 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 621 622 static void wdev_cleanup_work(struct work_struct *work) 623 { 624 struct wireless_dev *wdev; 625 struct cfg80211_registered_device *rdev; 626 627 wdev = container_of(work, struct wireless_dev, cleanup_work); 628 rdev = wiphy_to_dev(wdev->wiphy); 629 630 cfg80211_lock_rdev(rdev); 631 632 if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) { 633 rdev->scan_req->aborted = true; 634 ___cfg80211_scan_done(rdev, true); 635 } 636 637 cfg80211_unlock_rdev(rdev); 638 639 mutex_lock(&rdev->devlist_mtx); 640 rdev->opencount--; 641 mutex_unlock(&rdev->devlist_mtx); 642 wake_up(&rdev->dev_wait); 643 644 dev_put(wdev->netdev); 645 } 646 647 static struct device_type wiphy_type = { 648 .name = "wlan", 649 }; 650 651 static int cfg80211_netdev_notifier_call(struct notifier_block * nb, 652 unsigned long state, 653 void *ndev) 654 { 655 struct net_device *dev = ndev; 656 struct wireless_dev *wdev = dev->ieee80211_ptr; 657 struct cfg80211_registered_device *rdev; 658 659 if (!wdev) 660 return NOTIFY_DONE; 661 662 rdev = wiphy_to_dev(wdev->wiphy); 663 664 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 665 666 switch (state) { 667 case NETDEV_POST_INIT: 668 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 669 break; 670 case NETDEV_REGISTER: 671 /* 672 * NB: cannot take rdev->mtx here because this may be 673 * called within code protected by it when interfaces 674 * are added with nl80211. 675 */ 676 mutex_init(&wdev->mtx); 677 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work); 678 INIT_LIST_HEAD(&wdev->event_list); 679 spin_lock_init(&wdev->event_lock); 680 INIT_LIST_HEAD(&wdev->action_registrations); 681 spin_lock_init(&wdev->action_registrations_lock); 682 683 mutex_lock(&rdev->devlist_mtx); 684 list_add_rcu(&wdev->list, &rdev->netdev_list); 685 rdev->devlist_generation++; 686 /* can only change netns with wiphy */ 687 dev->features |= NETIF_F_NETNS_LOCAL; 688 689 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 690 "phy80211")) { 691 printk(KERN_ERR "wireless: failed to add phy80211 " 692 "symlink to netdev!\n"); 693 } 694 wdev->netdev = dev; 695 wdev->sme_state = CFG80211_SME_IDLE; 696 mutex_unlock(&rdev->devlist_mtx); 697 #ifdef CONFIG_CFG80211_WEXT 698 wdev->wext.default_key = -1; 699 wdev->wext.default_mgmt_key = -1; 700 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 701 #endif 702 703 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 704 wdev->ps = true; 705 else 706 wdev->ps = false; 707 wdev->ps_timeout = 100; 708 if (rdev->ops->set_power_mgmt) 709 if (rdev->ops->set_power_mgmt(wdev->wiphy, dev, 710 wdev->ps, 711 wdev->ps_timeout)) { 712 /* assume this means it's off */ 713 wdev->ps = false; 714 } 715 716 if (!dev->ethtool_ops) 717 dev->ethtool_ops = &cfg80211_ethtool_ops; 718 719 if ((wdev->iftype == NL80211_IFTYPE_STATION || 720 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 721 dev->priv_flags |= IFF_DONT_BRIDGE; 722 break; 723 case NETDEV_GOING_DOWN: 724 switch (wdev->iftype) { 725 case NL80211_IFTYPE_ADHOC: 726 cfg80211_leave_ibss(rdev, dev, true); 727 break; 728 case NL80211_IFTYPE_STATION: 729 wdev_lock(wdev); 730 #ifdef CONFIG_CFG80211_WEXT 731 kfree(wdev->wext.ie); 732 wdev->wext.ie = NULL; 733 wdev->wext.ie_len = 0; 734 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 735 #endif 736 __cfg80211_disconnect(rdev, dev, 737 WLAN_REASON_DEAUTH_LEAVING, true); 738 cfg80211_mlme_down(rdev, dev); 739 wdev_unlock(wdev); 740 break; 741 default: 742 break; 743 } 744 break; 745 case NETDEV_DOWN: 746 dev_hold(dev); 747 queue_work(cfg80211_wq, &wdev->cleanup_work); 748 break; 749 case NETDEV_UP: 750 /* 751 * If we have a really quick DOWN/UP succession we may 752 * have this work still pending ... cancel it and see 753 * if it was pending, in which case we need to account 754 * for some of the work it would have done. 755 */ 756 if (cancel_work_sync(&wdev->cleanup_work)) { 757 mutex_lock(&rdev->devlist_mtx); 758 rdev->opencount--; 759 mutex_unlock(&rdev->devlist_mtx); 760 dev_put(dev); 761 } 762 cfg80211_lock_rdev(rdev); 763 mutex_lock(&rdev->devlist_mtx); 764 #ifdef CONFIG_CFG80211_WEXT 765 wdev_lock(wdev); 766 switch (wdev->iftype) { 767 case NL80211_IFTYPE_ADHOC: 768 cfg80211_ibss_wext_join(rdev, wdev); 769 break; 770 case NL80211_IFTYPE_STATION: 771 cfg80211_mgd_wext_connect(rdev, wdev); 772 break; 773 default: 774 break; 775 } 776 wdev_unlock(wdev); 777 #endif 778 rdev->opencount++; 779 mutex_unlock(&rdev->devlist_mtx); 780 cfg80211_unlock_rdev(rdev); 781 break; 782 case NETDEV_UNREGISTER: 783 /* 784 * NB: cannot take rdev->mtx here because this may be 785 * called within code protected by it when interfaces 786 * are removed with nl80211. 787 */ 788 mutex_lock(&rdev->devlist_mtx); 789 /* 790 * It is possible to get NETDEV_UNREGISTER 791 * multiple times. To detect that, check 792 * that the interface is still on the list 793 * of registered interfaces, and only then 794 * remove and clean it up. 795 */ 796 if (!list_empty(&wdev->list)) { 797 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 798 list_del_rcu(&wdev->list); 799 rdev->devlist_generation++; 800 cfg80211_mlme_purge_actions(wdev); 801 #ifdef CONFIG_CFG80211_WEXT 802 kfree(wdev->wext.keys); 803 #endif 804 } 805 mutex_unlock(&rdev->devlist_mtx); 806 /* 807 * synchronise (so that we won't find this netdev 808 * from other code any more) and then clear the list 809 * head so that the above code can safely check for 810 * !list_empty() to avoid double-cleanup. 811 */ 812 synchronize_rcu(); 813 INIT_LIST_HEAD(&wdev->list); 814 break; 815 case NETDEV_PRE_UP: 816 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 817 return notifier_from_errno(-EOPNOTSUPP); 818 if (rfkill_blocked(rdev->rfkill)) 819 return notifier_from_errno(-ERFKILL); 820 break; 821 } 822 823 return NOTIFY_DONE; 824 } 825 826 static struct notifier_block cfg80211_netdev_notifier = { 827 .notifier_call = cfg80211_netdev_notifier_call, 828 }; 829 830 static void __net_exit cfg80211_pernet_exit(struct net *net) 831 { 832 struct cfg80211_registered_device *rdev; 833 834 rtnl_lock(); 835 mutex_lock(&cfg80211_mutex); 836 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 837 if (net_eq(wiphy_net(&rdev->wiphy), net)) 838 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 839 } 840 mutex_unlock(&cfg80211_mutex); 841 rtnl_unlock(); 842 } 843 844 static struct pernet_operations cfg80211_pernet_ops = { 845 .exit = cfg80211_pernet_exit, 846 }; 847 848 static int __init cfg80211_init(void) 849 { 850 int err; 851 852 err = register_pernet_device(&cfg80211_pernet_ops); 853 if (err) 854 goto out_fail_pernet; 855 856 err = wiphy_sysfs_init(); 857 if (err) 858 goto out_fail_sysfs; 859 860 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 861 if (err) 862 goto out_fail_notifier; 863 864 err = nl80211_init(); 865 if (err) 866 goto out_fail_nl80211; 867 868 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 869 870 err = regulatory_init(); 871 if (err) 872 goto out_fail_reg; 873 874 cfg80211_wq = create_singlethread_workqueue("cfg80211"); 875 if (!cfg80211_wq) 876 goto out_fail_wq; 877 878 return 0; 879 880 out_fail_wq: 881 regulatory_exit(); 882 out_fail_reg: 883 debugfs_remove(ieee80211_debugfs_dir); 884 out_fail_nl80211: 885 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 886 out_fail_notifier: 887 wiphy_sysfs_exit(); 888 out_fail_sysfs: 889 unregister_pernet_device(&cfg80211_pernet_ops); 890 out_fail_pernet: 891 return err; 892 } 893 subsys_initcall(cfg80211_init); 894 895 static void cfg80211_exit(void) 896 { 897 debugfs_remove(ieee80211_debugfs_dir); 898 nl80211_exit(); 899 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 900 wiphy_sysfs_exit(); 901 regulatory_exit(); 902 unregister_pernet_device(&cfg80211_pernet_ops); 903 destroy_workqueue(cfg80211_wq); 904 } 905 module_exit(cfg80211_exit); 906