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 mutex_lock(&cfg80211_mutex); 476 477 res = device_add(&rdev->wiphy.dev); 478 if (res) 479 goto out_unlock; 480 481 res = rfkill_register(rdev->rfkill); 482 if (res) 483 goto out_rm_dev; 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 /* add to debugfs */ 492 rdev->wiphy.debugfsdir = 493 debugfs_create_dir(wiphy_name(&rdev->wiphy), 494 ieee80211_debugfs_dir); 495 if (IS_ERR(rdev->wiphy.debugfsdir)) 496 rdev->wiphy.debugfsdir = NULL; 497 498 if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { 499 struct regulatory_request request; 500 501 request.wiphy_idx = get_wiphy_idx(wiphy); 502 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 503 request.alpha2[0] = '9'; 504 request.alpha2[1] = '9'; 505 506 nl80211_send_reg_change_event(&request); 507 } 508 509 cfg80211_debugfs_rdev_add(rdev); 510 mutex_unlock(&cfg80211_mutex); 511 512 return 0; 513 514 out_rm_dev: 515 device_del(&rdev->wiphy.dev); 516 517 out_unlock: 518 mutex_unlock(&cfg80211_mutex); 519 return res; 520 } 521 EXPORT_SYMBOL(wiphy_register); 522 523 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 524 { 525 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 526 527 if (!rdev->ops->rfkill_poll) 528 return; 529 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 530 rfkill_resume_polling(rdev->rfkill); 531 } 532 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 533 534 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 535 { 536 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 537 538 rfkill_pause_polling(rdev->rfkill); 539 } 540 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 541 542 void wiphy_unregister(struct wiphy *wiphy) 543 { 544 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 545 546 rfkill_unregister(rdev->rfkill); 547 548 /* protect the device list */ 549 mutex_lock(&cfg80211_mutex); 550 551 wait_event(rdev->dev_wait, ({ 552 int __count; 553 mutex_lock(&rdev->devlist_mtx); 554 __count = rdev->opencount; 555 mutex_unlock(&rdev->devlist_mtx); 556 __count == 0;})); 557 558 mutex_lock(&rdev->devlist_mtx); 559 BUG_ON(!list_empty(&rdev->netdev_list)); 560 mutex_unlock(&rdev->devlist_mtx); 561 562 /* 563 * First remove the hardware from everywhere, this makes 564 * it impossible to find from userspace. 565 */ 566 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 567 list_del_rcu(&rdev->list); 568 synchronize_rcu(); 569 570 /* 571 * Try to grab rdev->mtx. If a command is still in progress, 572 * hopefully the driver will refuse it since it's tearing 573 * down the device already. We wait for this command to complete 574 * before unlinking the item from the list. 575 * Note: as codified by the BUG_ON above we cannot get here if 576 * a virtual interface is still present. Hence, we can only get 577 * to lock contention here if userspace issues a command that 578 * identified the hardware by wiphy index. 579 */ 580 cfg80211_lock_rdev(rdev); 581 /* nothing */ 582 cfg80211_unlock_rdev(rdev); 583 584 /* If this device got a regulatory hint tell core its 585 * free to listen now to a new shiny device regulatory hint */ 586 reg_device_remove(wiphy); 587 588 cfg80211_rdev_list_generation++; 589 device_del(&rdev->wiphy.dev); 590 591 mutex_unlock(&cfg80211_mutex); 592 593 flush_work(&rdev->scan_done_wk); 594 cancel_work_sync(&rdev->conn_work); 595 flush_work(&rdev->event_work); 596 } 597 EXPORT_SYMBOL(wiphy_unregister); 598 599 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 600 { 601 struct cfg80211_internal_bss *scan, *tmp; 602 rfkill_destroy(rdev->rfkill); 603 mutex_destroy(&rdev->mtx); 604 mutex_destroy(&rdev->devlist_mtx); 605 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 606 cfg80211_put_bss(&scan->pub); 607 kfree(rdev); 608 } 609 610 void wiphy_free(struct wiphy *wiphy) 611 { 612 put_device(&wiphy->dev); 613 } 614 EXPORT_SYMBOL(wiphy_free); 615 616 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 617 { 618 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 619 620 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 621 schedule_work(&rdev->rfkill_sync); 622 } 623 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 624 625 static void wdev_cleanup_work(struct work_struct *work) 626 { 627 struct wireless_dev *wdev; 628 struct cfg80211_registered_device *rdev; 629 630 wdev = container_of(work, struct wireless_dev, cleanup_work); 631 rdev = wiphy_to_dev(wdev->wiphy); 632 633 cfg80211_lock_rdev(rdev); 634 635 if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) { 636 rdev->scan_req->aborted = true; 637 ___cfg80211_scan_done(rdev, true); 638 } 639 640 cfg80211_unlock_rdev(rdev); 641 642 mutex_lock(&rdev->devlist_mtx); 643 rdev->opencount--; 644 mutex_unlock(&rdev->devlist_mtx); 645 wake_up(&rdev->dev_wait); 646 647 dev_put(wdev->netdev); 648 } 649 650 static struct device_type wiphy_type = { 651 .name = "wlan", 652 }; 653 654 static int cfg80211_netdev_notifier_call(struct notifier_block * nb, 655 unsigned long state, 656 void *ndev) 657 { 658 struct net_device *dev = ndev; 659 struct wireless_dev *wdev = dev->ieee80211_ptr; 660 struct cfg80211_registered_device *rdev; 661 662 if (!wdev) 663 return NOTIFY_DONE; 664 665 rdev = wiphy_to_dev(wdev->wiphy); 666 667 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 668 669 switch (state) { 670 case NETDEV_POST_INIT: 671 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 672 break; 673 case NETDEV_REGISTER: 674 /* 675 * NB: cannot take rdev->mtx here because this may be 676 * called within code protected by it when interfaces 677 * are added with nl80211. 678 */ 679 mutex_init(&wdev->mtx); 680 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work); 681 INIT_LIST_HEAD(&wdev->event_list); 682 spin_lock_init(&wdev->event_lock); 683 INIT_LIST_HEAD(&wdev->action_registrations); 684 spin_lock_init(&wdev->action_registrations_lock); 685 686 mutex_lock(&rdev->devlist_mtx); 687 list_add_rcu(&wdev->list, &rdev->netdev_list); 688 rdev->devlist_generation++; 689 /* can only change netns with wiphy */ 690 dev->features |= NETIF_F_NETNS_LOCAL; 691 692 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 693 "phy80211")) { 694 printk(KERN_ERR "wireless: failed to add phy80211 " 695 "symlink to netdev!\n"); 696 } 697 wdev->netdev = dev; 698 wdev->sme_state = CFG80211_SME_IDLE; 699 mutex_unlock(&rdev->devlist_mtx); 700 #ifdef CONFIG_CFG80211_WEXT 701 wdev->wext.default_key = -1; 702 wdev->wext.default_mgmt_key = -1; 703 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 704 #endif 705 706 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 707 wdev->ps = true; 708 else 709 wdev->ps = false; 710 /* allow mac80211 to determine the timeout */ 711 wdev->ps_timeout = -1; 712 if (rdev->ops->set_power_mgmt) 713 if (rdev->ops->set_power_mgmt(wdev->wiphy, dev, 714 wdev->ps, 715 wdev->ps_timeout)) { 716 /* assume this means it's off */ 717 wdev->ps = false; 718 } 719 720 if (!dev->ethtool_ops) 721 dev->ethtool_ops = &cfg80211_ethtool_ops; 722 723 if ((wdev->iftype == NL80211_IFTYPE_STATION || 724 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 725 dev->priv_flags |= IFF_DONT_BRIDGE; 726 break; 727 case NETDEV_GOING_DOWN: 728 switch (wdev->iftype) { 729 case NL80211_IFTYPE_ADHOC: 730 cfg80211_leave_ibss(rdev, dev, true); 731 break; 732 case NL80211_IFTYPE_STATION: 733 wdev_lock(wdev); 734 #ifdef CONFIG_CFG80211_WEXT 735 kfree(wdev->wext.ie); 736 wdev->wext.ie = NULL; 737 wdev->wext.ie_len = 0; 738 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 739 #endif 740 __cfg80211_disconnect(rdev, dev, 741 WLAN_REASON_DEAUTH_LEAVING, true); 742 cfg80211_mlme_down(rdev, dev); 743 wdev_unlock(wdev); 744 break; 745 default: 746 break; 747 } 748 break; 749 case NETDEV_DOWN: 750 dev_hold(dev); 751 queue_work(cfg80211_wq, &wdev->cleanup_work); 752 break; 753 case NETDEV_UP: 754 /* 755 * If we have a really quick DOWN/UP succession we may 756 * have this work still pending ... cancel it and see 757 * if it was pending, in which case we need to account 758 * for some of the work it would have done. 759 */ 760 if (cancel_work_sync(&wdev->cleanup_work)) { 761 mutex_lock(&rdev->devlist_mtx); 762 rdev->opencount--; 763 mutex_unlock(&rdev->devlist_mtx); 764 dev_put(dev); 765 } 766 cfg80211_lock_rdev(rdev); 767 mutex_lock(&rdev->devlist_mtx); 768 #ifdef CONFIG_CFG80211_WEXT 769 wdev_lock(wdev); 770 switch (wdev->iftype) { 771 case NL80211_IFTYPE_ADHOC: 772 cfg80211_ibss_wext_join(rdev, wdev); 773 break; 774 case NL80211_IFTYPE_STATION: 775 cfg80211_mgd_wext_connect(rdev, wdev); 776 break; 777 default: 778 break; 779 } 780 wdev_unlock(wdev); 781 #endif 782 rdev->opencount++; 783 mutex_unlock(&rdev->devlist_mtx); 784 cfg80211_unlock_rdev(rdev); 785 break; 786 case NETDEV_UNREGISTER: 787 /* 788 * NB: cannot take rdev->mtx here because this may be 789 * called within code protected by it when interfaces 790 * are removed with nl80211. 791 */ 792 mutex_lock(&rdev->devlist_mtx); 793 /* 794 * It is possible to get NETDEV_UNREGISTER 795 * multiple times. To detect that, check 796 * that the interface is still on the list 797 * of registered interfaces, and only then 798 * remove and clean it up. 799 */ 800 if (!list_empty(&wdev->list)) { 801 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 802 list_del_rcu(&wdev->list); 803 rdev->devlist_generation++; 804 cfg80211_mlme_purge_actions(wdev); 805 #ifdef CONFIG_CFG80211_WEXT 806 kfree(wdev->wext.keys); 807 #endif 808 } 809 mutex_unlock(&rdev->devlist_mtx); 810 /* 811 * synchronise (so that we won't find this netdev 812 * from other code any more) and then clear the list 813 * head so that the above code can safely check for 814 * !list_empty() to avoid double-cleanup. 815 */ 816 synchronize_rcu(); 817 INIT_LIST_HEAD(&wdev->list); 818 break; 819 case NETDEV_PRE_UP: 820 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 821 return notifier_from_errno(-EOPNOTSUPP); 822 if (rfkill_blocked(rdev->rfkill)) 823 return notifier_from_errno(-ERFKILL); 824 break; 825 } 826 827 return NOTIFY_DONE; 828 } 829 830 static struct notifier_block cfg80211_netdev_notifier = { 831 .notifier_call = cfg80211_netdev_notifier_call, 832 }; 833 834 static void __net_exit cfg80211_pernet_exit(struct net *net) 835 { 836 struct cfg80211_registered_device *rdev; 837 838 rtnl_lock(); 839 mutex_lock(&cfg80211_mutex); 840 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 841 if (net_eq(wiphy_net(&rdev->wiphy), net)) 842 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 843 } 844 mutex_unlock(&cfg80211_mutex); 845 rtnl_unlock(); 846 } 847 848 static struct pernet_operations cfg80211_pernet_ops = { 849 .exit = cfg80211_pernet_exit, 850 }; 851 852 static int __init cfg80211_init(void) 853 { 854 int err; 855 856 err = register_pernet_device(&cfg80211_pernet_ops); 857 if (err) 858 goto out_fail_pernet; 859 860 err = wiphy_sysfs_init(); 861 if (err) 862 goto out_fail_sysfs; 863 864 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 865 if (err) 866 goto out_fail_notifier; 867 868 err = nl80211_init(); 869 if (err) 870 goto out_fail_nl80211; 871 872 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 873 874 err = regulatory_init(); 875 if (err) 876 goto out_fail_reg; 877 878 cfg80211_wq = create_singlethread_workqueue("cfg80211"); 879 if (!cfg80211_wq) 880 goto out_fail_wq; 881 882 return 0; 883 884 out_fail_wq: 885 regulatory_exit(); 886 out_fail_reg: 887 debugfs_remove(ieee80211_debugfs_dir); 888 out_fail_nl80211: 889 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 890 out_fail_notifier: 891 wiphy_sysfs_exit(); 892 out_fail_sysfs: 893 unregister_pernet_device(&cfg80211_pernet_ops); 894 out_fail_pernet: 895 return err; 896 } 897 subsys_initcall(cfg80211_init); 898 899 static void __exit cfg80211_exit(void) 900 { 901 debugfs_remove(ieee80211_debugfs_dir); 902 nl80211_exit(); 903 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 904 wiphy_sysfs_exit(); 905 regulatory_exit(); 906 unregister_pernet_device(&cfg80211_pernet_ops); 907 destroy_workqueue(cfg80211_wq); 908 } 909 module_exit(cfg80211_exit); 910 911 static int ___wiphy_printk(const char *level, const struct wiphy *wiphy, 912 struct va_format *vaf) 913 { 914 if (!wiphy) 915 return printk("%s(NULL wiphy *): %pV", level, vaf); 916 917 return printk("%s%s: %pV", level, wiphy_name(wiphy), vaf); 918 } 919 920 int __wiphy_printk(const char *level, const struct wiphy *wiphy, 921 const char *fmt, ...) 922 { 923 struct va_format vaf; 924 va_list args; 925 int r; 926 927 va_start(args, fmt); 928 929 vaf.fmt = fmt; 930 vaf.va = &args; 931 932 r = ___wiphy_printk(level, wiphy, &vaf); 933 va_end(args); 934 935 return r; 936 } 937 EXPORT_SYMBOL(__wiphy_printk); 938 939 #define define_wiphy_printk_level(func, kern_level) \ 940 int func(const struct wiphy *wiphy, const char *fmt, ...) \ 941 { \ 942 struct va_format vaf; \ 943 va_list args; \ 944 int r; \ 945 \ 946 va_start(args, fmt); \ 947 \ 948 vaf.fmt = fmt; \ 949 vaf.va = &args; \ 950 \ 951 r = ___wiphy_printk(kern_level, wiphy, &vaf); \ 952 va_end(args); \ 953 \ 954 return r; \ 955 } \ 956 EXPORT_SYMBOL(func); 957 958 define_wiphy_printk_level(wiphy_debug, KERN_DEBUG); 959