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/slab.h> 12 #include <linux/nl80211.h> 13 #include <linux/debugfs.h> 14 #include <linux/notifier.h> 15 #include <linux/device.h> 16 #include <linux/etherdevice.h> 17 #include <linux/rtnetlink.h> 18 #include <linux/sched.h> 19 #include <net/genetlink.h> 20 #include <net/cfg80211.h> 21 #include "nl80211.h" 22 #include "core.h" 23 #include "sysfs.h" 24 #include "debugfs.h" 25 #include "wext-compat.h" 26 #include "ethtool.h" 27 28 /* name for sysfs, %d is appended */ 29 #define PHY_NAME "phy" 30 31 MODULE_AUTHOR("Johannes Berg"); 32 MODULE_LICENSE("GPL"); 33 MODULE_DESCRIPTION("wireless configuration support"); 34 35 /* RCU-protected (and cfg80211_mutex for writers) */ 36 LIST_HEAD(cfg80211_rdev_list); 37 int cfg80211_rdev_list_generation; 38 39 DEFINE_MUTEX(cfg80211_mutex); 40 41 /* for debugfs */ 42 static struct dentry *ieee80211_debugfs_dir; 43 44 /* for the cleanup, scan and event works */ 45 struct workqueue_struct *cfg80211_wq; 46 47 /* requires cfg80211_mutex to be held! */ 48 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx) 49 { 50 struct cfg80211_registered_device *result = NULL, *rdev; 51 52 if (!wiphy_idx_valid(wiphy_idx)) 53 return NULL; 54 55 assert_cfg80211_lock(); 56 57 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 58 if (rdev->wiphy_idx == wiphy_idx) { 59 result = rdev; 60 break; 61 } 62 } 63 64 return result; 65 } 66 67 int get_wiphy_idx(struct wiphy *wiphy) 68 { 69 struct cfg80211_registered_device *rdev; 70 if (!wiphy) 71 return WIPHY_IDX_STALE; 72 rdev = wiphy_to_dev(wiphy); 73 return rdev->wiphy_idx; 74 } 75 76 /* requires cfg80211_rdev_mutex to be held! */ 77 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx) 78 { 79 struct cfg80211_registered_device *rdev; 80 81 if (!wiphy_idx_valid(wiphy_idx)) 82 return NULL; 83 84 assert_cfg80211_lock(); 85 86 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx); 87 if (!rdev) 88 return NULL; 89 return &rdev->wiphy; 90 } 91 92 /* requires cfg80211_mutex to be held! */ 93 struct cfg80211_registered_device * 94 __cfg80211_rdev_from_info(struct genl_info *info) 95 { 96 int ifindex; 97 struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL; 98 struct net_device *dev; 99 int err = -EINVAL; 100 101 assert_cfg80211_lock(); 102 103 if (info->attrs[NL80211_ATTR_WIPHY]) { 104 bywiphyidx = cfg80211_rdev_by_wiphy_idx( 105 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY])); 106 err = -ENODEV; 107 } 108 109 if (info->attrs[NL80211_ATTR_IFINDEX]) { 110 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]); 111 dev = dev_get_by_index(genl_info_net(info), ifindex); 112 if (dev) { 113 if (dev->ieee80211_ptr) 114 byifidx = 115 wiphy_to_dev(dev->ieee80211_ptr->wiphy); 116 dev_put(dev); 117 } 118 err = -ENODEV; 119 } 120 121 if (bywiphyidx && byifidx) { 122 if (bywiphyidx != byifidx) 123 return ERR_PTR(-EINVAL); 124 else 125 return bywiphyidx; /* == byifidx */ 126 } 127 if (bywiphyidx) 128 return bywiphyidx; 129 130 if (byifidx) 131 return byifidx; 132 133 return ERR_PTR(err); 134 } 135 136 struct cfg80211_registered_device * 137 cfg80211_get_dev_from_info(struct genl_info *info) 138 { 139 struct cfg80211_registered_device *rdev; 140 141 mutex_lock(&cfg80211_mutex); 142 rdev = __cfg80211_rdev_from_info(info); 143 144 /* if it is not an error we grab the lock on 145 * it to assure it won't be going away while 146 * we operate on it */ 147 if (!IS_ERR(rdev)) 148 mutex_lock(&rdev->mtx); 149 150 mutex_unlock(&cfg80211_mutex); 151 152 return rdev; 153 } 154 155 struct cfg80211_registered_device * 156 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) 157 { 158 struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV); 159 struct net_device *dev; 160 161 mutex_lock(&cfg80211_mutex); 162 dev = dev_get_by_index(net, ifindex); 163 if (!dev) 164 goto out; 165 if (dev->ieee80211_ptr) { 166 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy); 167 mutex_lock(&rdev->mtx); 168 } else 169 rdev = ERR_PTR(-ENODEV); 170 dev_put(dev); 171 out: 172 mutex_unlock(&cfg80211_mutex); 173 return rdev; 174 } 175 176 /* requires cfg80211_mutex to be held */ 177 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, 178 char *newname) 179 { 180 struct cfg80211_registered_device *rdev2; 181 int wiphy_idx, taken = -1, result, digits; 182 183 assert_cfg80211_lock(); 184 185 /* prohibit calling the thing phy%d when %d is not its number */ 186 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken); 187 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) { 188 /* count number of places needed to print wiphy_idx */ 189 digits = 1; 190 while (wiphy_idx /= 10) 191 digits++; 192 /* 193 * deny the name if it is phy<idx> where <idx> is printed 194 * without leading zeroes. taken == strlen(newname) here 195 */ 196 if (taken == strlen(PHY_NAME) + digits) 197 return -EINVAL; 198 } 199 200 201 /* Ignore nop renames */ 202 if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0) 203 return 0; 204 205 /* Ensure another device does not already have this name. */ 206 list_for_each_entry(rdev2, &cfg80211_rdev_list, list) 207 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0) 208 return -EINVAL; 209 210 result = device_rename(&rdev->wiphy.dev, newname); 211 if (result) 212 return result; 213 214 if (rdev->wiphy.debugfsdir && 215 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent, 216 rdev->wiphy.debugfsdir, 217 rdev->wiphy.debugfsdir->d_parent, 218 newname)) 219 printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n", 220 newname); 221 222 nl80211_notify_dev_rename(rdev); 223 224 return 0; 225 } 226 227 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, 228 struct net *net) 229 { 230 struct wireless_dev *wdev; 231 int err = 0; 232 233 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK)) 234 return -EOPNOTSUPP; 235 236 list_for_each_entry(wdev, &rdev->netdev_list, list) { 237 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 238 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); 239 if (err) 240 break; 241 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 242 } 243 244 if (err) { 245 /* failed -- clean up to old netns */ 246 net = wiphy_net(&rdev->wiphy); 247 248 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list, 249 list) { 250 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 251 err = dev_change_net_namespace(wdev->netdev, net, 252 "wlan%d"); 253 WARN_ON(err); 254 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 255 } 256 } 257 258 wiphy_net_set(&rdev->wiphy, net); 259 260 return err; 261 } 262 263 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data) 264 { 265 struct cfg80211_registered_device *rdev = data; 266 267 rdev->ops->rfkill_poll(&rdev->wiphy); 268 } 269 270 static int cfg80211_rfkill_set_block(void *data, bool blocked) 271 { 272 struct cfg80211_registered_device *rdev = data; 273 struct wireless_dev *wdev; 274 275 if (!blocked) 276 return 0; 277 278 rtnl_lock(); 279 mutex_lock(&rdev->devlist_mtx); 280 281 list_for_each_entry(wdev, &rdev->netdev_list, list) 282 dev_close(wdev->netdev); 283 284 mutex_unlock(&rdev->devlist_mtx); 285 rtnl_unlock(); 286 287 return 0; 288 } 289 290 static void cfg80211_rfkill_sync_work(struct work_struct *work) 291 { 292 struct cfg80211_registered_device *rdev; 293 294 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync); 295 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill)); 296 } 297 298 static void cfg80211_event_work(struct work_struct *work) 299 { 300 struct cfg80211_registered_device *rdev; 301 302 rdev = container_of(work, struct cfg80211_registered_device, 303 event_work); 304 305 rtnl_lock(); 306 cfg80211_lock_rdev(rdev); 307 308 cfg80211_process_rdev_events(rdev); 309 cfg80211_unlock_rdev(rdev); 310 rtnl_unlock(); 311 } 312 313 /* exported functions */ 314 315 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv) 316 { 317 static int wiphy_counter; 318 319 struct cfg80211_registered_device *rdev; 320 int alloc_size; 321 322 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 323 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 324 WARN_ON(ops->connect && !ops->disconnect); 325 WARN_ON(ops->join_ibss && !ops->leave_ibss); 326 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 327 WARN_ON(ops->add_station && !ops->del_station); 328 WARN_ON(ops->add_mpath && !ops->del_mpath); 329 330 alloc_size = sizeof(*rdev) + sizeof_priv; 331 332 rdev = kzalloc(alloc_size, GFP_KERNEL); 333 if (!rdev) 334 return NULL; 335 336 rdev->ops = ops; 337 338 mutex_lock(&cfg80211_mutex); 339 340 rdev->wiphy_idx = wiphy_counter++; 341 342 if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) { 343 wiphy_counter--; 344 mutex_unlock(&cfg80211_mutex); 345 /* ugh, wrapped! */ 346 kfree(rdev); 347 return NULL; 348 } 349 350 mutex_unlock(&cfg80211_mutex); 351 352 /* give it a proper name */ 353 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 354 355 mutex_init(&rdev->mtx); 356 mutex_init(&rdev->devlist_mtx); 357 INIT_LIST_HEAD(&rdev->netdev_list); 358 spin_lock_init(&rdev->bss_lock); 359 INIT_LIST_HEAD(&rdev->bss_list); 360 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 361 362 #ifdef CONFIG_CFG80211_WEXT 363 rdev->wiphy.wext = &cfg80211_wext_handler; 364 #endif 365 366 device_initialize(&rdev->wiphy.dev); 367 rdev->wiphy.dev.class = &ieee80211_class; 368 rdev->wiphy.dev.platform_data = rdev; 369 370 #ifdef CONFIG_CFG80211_DEFAULT_PS 371 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 372 #endif 373 374 wiphy_net_set(&rdev->wiphy, &init_net); 375 376 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 377 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 378 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 379 &rdev->rfkill_ops, rdev); 380 381 if (!rdev->rfkill) { 382 kfree(rdev); 383 return NULL; 384 } 385 386 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); 387 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 388 INIT_WORK(&rdev->event_work, cfg80211_event_work); 389 390 init_waitqueue_head(&rdev->dev_wait); 391 392 /* 393 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 394 * Fragmentation and RTS threshold are disabled by default with the 395 * special -1 value. 396 */ 397 rdev->wiphy.retry_short = 7; 398 rdev->wiphy.retry_long = 4; 399 rdev->wiphy.frag_threshold = (u32) -1; 400 rdev->wiphy.rts_threshold = (u32) -1; 401 rdev->wiphy.coverage_class = 0; 402 403 return &rdev->wiphy; 404 } 405 EXPORT_SYMBOL(wiphy_new); 406 407 int wiphy_register(struct wiphy *wiphy) 408 { 409 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 410 int res; 411 enum ieee80211_band band; 412 struct ieee80211_supported_band *sband; 413 bool have_band = false; 414 int i; 415 u16 ifmodes = wiphy->interface_modes; 416 417 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 418 return -EINVAL; 419 420 if (WARN_ON(wiphy->addresses && 421 !is_zero_ether_addr(wiphy->perm_addr) && 422 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 423 ETH_ALEN))) 424 return -EINVAL; 425 426 if (wiphy->addresses) 427 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 428 429 /* sanity check ifmodes */ 430 WARN_ON(!ifmodes); 431 ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1; 432 if (WARN_ON(ifmodes != wiphy->interface_modes)) 433 wiphy->interface_modes = ifmodes; 434 435 /* sanity check supported bands/channels */ 436 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 437 sband = wiphy->bands[band]; 438 if (!sband) 439 continue; 440 441 sband->band = band; 442 443 if (WARN_ON(!sband->n_channels || !sband->n_bitrates)) 444 return -EINVAL; 445 446 /* 447 * Since we use a u32 for rate bitmaps in 448 * ieee80211_get_response_rate, we cannot 449 * have more than 32 legacy rates. 450 */ 451 if (WARN_ON(sband->n_bitrates > 32)) 452 return -EINVAL; 453 454 for (i = 0; i < sband->n_channels; i++) { 455 sband->channels[i].orig_flags = 456 sband->channels[i].flags; 457 sband->channels[i].orig_mag = 458 sband->channels[i].max_antenna_gain; 459 sband->channels[i].orig_mpwr = 460 sband->channels[i].max_power; 461 sband->channels[i].band = band; 462 } 463 464 have_band = true; 465 } 466 467 if (!have_band) { 468 WARN_ON(1); 469 return -EINVAL; 470 } 471 472 /* check and set up bitrates */ 473 ieee80211_set_bitrate_flags(wiphy); 474 475 res = device_add(&rdev->wiphy.dev); 476 if (res) 477 return res; 478 479 res = rfkill_register(rdev->rfkill); 480 if (res) 481 goto out_rm_dev; 482 483 mutex_lock(&cfg80211_mutex); 484 485 /* set up regulatory info */ 486 wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE); 487 488 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 489 cfg80211_rdev_list_generation++; 490 491 mutex_unlock(&cfg80211_mutex); 492 493 /* add to debugfs */ 494 rdev->wiphy.debugfsdir = 495 debugfs_create_dir(wiphy_name(&rdev->wiphy), 496 ieee80211_debugfs_dir); 497 if (IS_ERR(rdev->wiphy.debugfsdir)) 498 rdev->wiphy.debugfsdir = NULL; 499 500 if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { 501 struct regulatory_request request; 502 503 request.wiphy_idx = get_wiphy_idx(wiphy); 504 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 505 request.alpha2[0] = '9'; 506 request.alpha2[1] = '9'; 507 508 nl80211_send_reg_change_event(&request); 509 } 510 511 cfg80211_debugfs_rdev_add(rdev); 512 513 return 0; 514 515 out_rm_dev: 516 device_del(&rdev->wiphy.dev); 517 return res; 518 } 519 EXPORT_SYMBOL(wiphy_register); 520 521 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 522 { 523 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 524 525 if (!rdev->ops->rfkill_poll) 526 return; 527 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 528 rfkill_resume_polling(rdev->rfkill); 529 } 530 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 531 532 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 533 { 534 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 535 536 rfkill_pause_polling(rdev->rfkill); 537 } 538 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 539 540 void wiphy_unregister(struct wiphy *wiphy) 541 { 542 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 543 544 rfkill_unregister(rdev->rfkill); 545 546 /* protect the device list */ 547 mutex_lock(&cfg80211_mutex); 548 549 wait_event(rdev->dev_wait, ({ 550 int __count; 551 mutex_lock(&rdev->devlist_mtx); 552 __count = rdev->opencount; 553 mutex_unlock(&rdev->devlist_mtx); 554 __count == 0;})); 555 556 mutex_lock(&rdev->devlist_mtx); 557 BUG_ON(!list_empty(&rdev->netdev_list)); 558 mutex_unlock(&rdev->devlist_mtx); 559 560 /* 561 * First remove the hardware from everywhere, this makes 562 * it impossible to find from userspace. 563 */ 564 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 565 list_del_rcu(&rdev->list); 566 synchronize_rcu(); 567 568 /* 569 * Try to grab rdev->mtx. If a command is still in progress, 570 * hopefully the driver will refuse it since it's tearing 571 * down the device already. We wait for this command to complete 572 * before unlinking the item from the list. 573 * Note: as codified by the BUG_ON above we cannot get here if 574 * a virtual interface is still present. Hence, we can only get 575 * to lock contention here if userspace issues a command that 576 * identified the hardware by wiphy index. 577 */ 578 cfg80211_lock_rdev(rdev); 579 /* nothing */ 580 cfg80211_unlock_rdev(rdev); 581 582 /* If this device got a regulatory hint tell core its 583 * free to listen now to a new shiny device regulatory hint */ 584 reg_device_remove(wiphy); 585 586 cfg80211_rdev_list_generation++; 587 device_del(&rdev->wiphy.dev); 588 589 mutex_unlock(&cfg80211_mutex); 590 591 flush_work(&rdev->scan_done_wk); 592 cancel_work_sync(&rdev->conn_work); 593 flush_work(&rdev->event_work); 594 } 595 EXPORT_SYMBOL(wiphy_unregister); 596 597 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 598 { 599 struct cfg80211_internal_bss *scan, *tmp; 600 rfkill_destroy(rdev->rfkill); 601 mutex_destroy(&rdev->mtx); 602 mutex_destroy(&rdev->devlist_mtx); 603 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 604 cfg80211_put_bss(&scan->pub); 605 kfree(rdev); 606 } 607 608 void wiphy_free(struct wiphy *wiphy) 609 { 610 put_device(&wiphy->dev); 611 } 612 EXPORT_SYMBOL(wiphy_free); 613 614 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 615 { 616 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 617 618 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 619 schedule_work(&rdev->rfkill_sync); 620 } 621 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 622 623 static void wdev_cleanup_work(struct work_struct *work) 624 { 625 struct wireless_dev *wdev; 626 struct cfg80211_registered_device *rdev; 627 628 wdev = container_of(work, struct wireless_dev, cleanup_work); 629 rdev = wiphy_to_dev(wdev->wiphy); 630 631 cfg80211_lock_rdev(rdev); 632 633 if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) { 634 rdev->scan_req->aborted = true; 635 ___cfg80211_scan_done(rdev, true); 636 } 637 638 cfg80211_unlock_rdev(rdev); 639 640 mutex_lock(&rdev->devlist_mtx); 641 rdev->opencount--; 642 mutex_unlock(&rdev->devlist_mtx); 643 wake_up(&rdev->dev_wait); 644 645 dev_put(wdev->netdev); 646 } 647 648 static struct device_type wiphy_type = { 649 .name = "wlan", 650 }; 651 652 static int cfg80211_netdev_notifier_call(struct notifier_block * nb, 653 unsigned long state, 654 void *ndev) 655 { 656 struct net_device *dev = ndev; 657 struct wireless_dev *wdev = dev->ieee80211_ptr; 658 struct cfg80211_registered_device *rdev; 659 660 if (!wdev) 661 return NOTIFY_DONE; 662 663 rdev = wiphy_to_dev(wdev->wiphy); 664 665 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 666 667 switch (state) { 668 case NETDEV_POST_INIT: 669 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 670 break; 671 case NETDEV_REGISTER: 672 /* 673 * NB: cannot take rdev->mtx here because this may be 674 * called within code protected by it when interfaces 675 * are added with nl80211. 676 */ 677 mutex_init(&wdev->mtx); 678 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work); 679 INIT_LIST_HEAD(&wdev->event_list); 680 spin_lock_init(&wdev->event_lock); 681 INIT_LIST_HEAD(&wdev->action_registrations); 682 spin_lock_init(&wdev->action_registrations_lock); 683 684 mutex_lock(&rdev->devlist_mtx); 685 list_add_rcu(&wdev->list, &rdev->netdev_list); 686 rdev->devlist_generation++; 687 /* can only change netns with wiphy */ 688 dev->features |= NETIF_F_NETNS_LOCAL; 689 690 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 691 "phy80211")) { 692 printk(KERN_ERR "wireless: failed to add phy80211 " 693 "symlink to netdev!\n"); 694 } 695 wdev->netdev = dev; 696 wdev->sme_state = CFG80211_SME_IDLE; 697 mutex_unlock(&rdev->devlist_mtx); 698 #ifdef CONFIG_CFG80211_WEXT 699 wdev->wext.default_key = -1; 700 wdev->wext.default_mgmt_key = -1; 701 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 702 #endif 703 704 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 705 wdev->ps = true; 706 else 707 wdev->ps = false; 708 wdev->ps_timeout = 100; 709 if (rdev->ops->set_power_mgmt) 710 if (rdev->ops->set_power_mgmt(wdev->wiphy, dev, 711 wdev->ps, 712 wdev->ps_timeout)) { 713 /* assume this means it's off */ 714 wdev->ps = false; 715 } 716 717 if (!dev->ethtool_ops) 718 dev->ethtool_ops = &cfg80211_ethtool_ops; 719 720 if ((wdev->iftype == NL80211_IFTYPE_STATION || 721 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 722 dev->priv_flags |= IFF_DONT_BRIDGE; 723 break; 724 case NETDEV_GOING_DOWN: 725 switch (wdev->iftype) { 726 case NL80211_IFTYPE_ADHOC: 727 cfg80211_leave_ibss(rdev, dev, true); 728 break; 729 case NL80211_IFTYPE_STATION: 730 wdev_lock(wdev); 731 #ifdef CONFIG_CFG80211_WEXT 732 kfree(wdev->wext.ie); 733 wdev->wext.ie = NULL; 734 wdev->wext.ie_len = 0; 735 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 736 #endif 737 __cfg80211_disconnect(rdev, dev, 738 WLAN_REASON_DEAUTH_LEAVING, true); 739 cfg80211_mlme_down(rdev, dev); 740 wdev_unlock(wdev); 741 break; 742 default: 743 break; 744 } 745 break; 746 case NETDEV_DOWN: 747 dev_hold(dev); 748 queue_work(cfg80211_wq, &wdev->cleanup_work); 749 break; 750 case NETDEV_UP: 751 /* 752 * If we have a really quick DOWN/UP succession we may 753 * have this work still pending ... cancel it and see 754 * if it was pending, in which case we need to account 755 * for some of the work it would have done. 756 */ 757 if (cancel_work_sync(&wdev->cleanup_work)) { 758 mutex_lock(&rdev->devlist_mtx); 759 rdev->opencount--; 760 mutex_unlock(&rdev->devlist_mtx); 761 dev_put(dev); 762 } 763 cfg80211_lock_rdev(rdev); 764 mutex_lock(&rdev->devlist_mtx); 765 #ifdef CONFIG_CFG80211_WEXT 766 wdev_lock(wdev); 767 switch (wdev->iftype) { 768 case NL80211_IFTYPE_ADHOC: 769 cfg80211_ibss_wext_join(rdev, wdev); 770 break; 771 case NL80211_IFTYPE_STATION: 772 cfg80211_mgd_wext_connect(rdev, wdev); 773 break; 774 default: 775 break; 776 } 777 wdev_unlock(wdev); 778 #endif 779 rdev->opencount++; 780 mutex_unlock(&rdev->devlist_mtx); 781 cfg80211_unlock_rdev(rdev); 782 break; 783 case NETDEV_UNREGISTER: 784 /* 785 * NB: cannot take rdev->mtx here because this may be 786 * called within code protected by it when interfaces 787 * are removed with nl80211. 788 */ 789 mutex_lock(&rdev->devlist_mtx); 790 /* 791 * It is possible to get NETDEV_UNREGISTER 792 * multiple times. To detect that, check 793 * that the interface is still on the list 794 * of registered interfaces, and only then 795 * remove and clean it up. 796 */ 797 if (!list_empty(&wdev->list)) { 798 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 799 list_del_rcu(&wdev->list); 800 rdev->devlist_generation++; 801 cfg80211_mlme_purge_actions(wdev); 802 #ifdef CONFIG_CFG80211_WEXT 803 kfree(wdev->wext.keys); 804 #endif 805 } 806 mutex_unlock(&rdev->devlist_mtx); 807 /* 808 * synchronise (so that we won't find this netdev 809 * from other code any more) and then clear the list 810 * head so that the above code can safely check for 811 * !list_empty() to avoid double-cleanup. 812 */ 813 synchronize_rcu(); 814 INIT_LIST_HEAD(&wdev->list); 815 break; 816 case NETDEV_PRE_UP: 817 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 818 return notifier_from_errno(-EOPNOTSUPP); 819 if (rfkill_blocked(rdev->rfkill)) 820 return notifier_from_errno(-ERFKILL); 821 break; 822 } 823 824 return NOTIFY_DONE; 825 } 826 827 static struct notifier_block cfg80211_netdev_notifier = { 828 .notifier_call = cfg80211_netdev_notifier_call, 829 }; 830 831 static void __net_exit cfg80211_pernet_exit(struct net *net) 832 { 833 struct cfg80211_registered_device *rdev; 834 835 rtnl_lock(); 836 mutex_lock(&cfg80211_mutex); 837 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 838 if (net_eq(wiphy_net(&rdev->wiphy), net)) 839 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 840 } 841 mutex_unlock(&cfg80211_mutex); 842 rtnl_unlock(); 843 } 844 845 static struct pernet_operations cfg80211_pernet_ops = { 846 .exit = cfg80211_pernet_exit, 847 }; 848 849 static int __init cfg80211_init(void) 850 { 851 int err; 852 853 err = register_pernet_device(&cfg80211_pernet_ops); 854 if (err) 855 goto out_fail_pernet; 856 857 err = wiphy_sysfs_init(); 858 if (err) 859 goto out_fail_sysfs; 860 861 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 862 if (err) 863 goto out_fail_notifier; 864 865 err = nl80211_init(); 866 if (err) 867 goto out_fail_nl80211; 868 869 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 870 871 err = regulatory_init(); 872 if (err) 873 goto out_fail_reg; 874 875 cfg80211_wq = create_singlethread_workqueue("cfg80211"); 876 if (!cfg80211_wq) 877 goto out_fail_wq; 878 879 return 0; 880 881 out_fail_wq: 882 regulatory_exit(); 883 out_fail_reg: 884 debugfs_remove(ieee80211_debugfs_dir); 885 out_fail_nl80211: 886 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 887 out_fail_notifier: 888 wiphy_sysfs_exit(); 889 out_fail_sysfs: 890 unregister_pernet_device(&cfg80211_pernet_ops); 891 out_fail_pernet: 892 return err; 893 } 894 subsys_initcall(cfg80211_init); 895 896 static void cfg80211_exit(void) 897 { 898 debugfs_remove(ieee80211_debugfs_dir); 899 nl80211_exit(); 900 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 901 wiphy_sysfs_exit(); 902 regulatory_exit(); 903 unregister_pernet_device(&cfg80211_pernet_ops); 904 destroy_workqueue(cfg80211_wq); 905 } 906 module_exit(cfg80211_exit); 907