1 /* 2 * This is the linux wireless configuration interface. 3 * 4 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net> 5 * Copyright 2013-2014 Intel Mobile Communications GmbH 6 */ 7 8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10 #include <linux/if.h> 11 #include <linux/module.h> 12 #include <linux/err.h> 13 #include <linux/list.h> 14 #include <linux/slab.h> 15 #include <linux/nl80211.h> 16 #include <linux/debugfs.h> 17 #include <linux/notifier.h> 18 #include <linux/device.h> 19 #include <linux/etherdevice.h> 20 #include <linux/rtnetlink.h> 21 #include <linux/sched.h> 22 #include <net/genetlink.h> 23 #include <net/cfg80211.h> 24 #include "nl80211.h" 25 #include "core.h" 26 #include "sysfs.h" 27 #include "debugfs.h" 28 #include "wext-compat.h" 29 #include "rdev-ops.h" 30 31 /* name for sysfs, %d is appended */ 32 #define PHY_NAME "phy" 33 34 MODULE_AUTHOR("Johannes Berg"); 35 MODULE_LICENSE("GPL"); 36 MODULE_DESCRIPTION("wireless configuration support"); 37 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME); 38 39 /* RCU-protected (and RTNL for writers) */ 40 LIST_HEAD(cfg80211_rdev_list); 41 int cfg80211_rdev_list_generation; 42 43 /* for debugfs */ 44 static struct dentry *ieee80211_debugfs_dir; 45 46 /* for the cleanup, scan and event works */ 47 struct workqueue_struct *cfg80211_wq; 48 49 static bool cfg80211_disable_40mhz_24ghz; 50 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644); 51 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz, 52 "Disable 40MHz support in the 2.4GHz band"); 53 54 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx) 55 { 56 struct cfg80211_registered_device *result = NULL, *rdev; 57 58 ASSERT_RTNL(); 59 60 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 61 if (rdev->wiphy_idx == wiphy_idx) { 62 result = rdev; 63 break; 64 } 65 } 66 67 return result; 68 } 69 70 int get_wiphy_idx(struct wiphy *wiphy) 71 { 72 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 73 74 return rdev->wiphy_idx; 75 } 76 77 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx) 78 { 79 struct cfg80211_registered_device *rdev; 80 81 ASSERT_RTNL(); 82 83 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx); 84 if (!rdev) 85 return NULL; 86 return &rdev->wiphy; 87 } 88 89 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev, 90 const char *newname) 91 { 92 struct cfg80211_registered_device *rdev2; 93 int wiphy_idx, taken = -1, 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 /* Ensure another device does not already have this name. */ 113 list_for_each_entry(rdev2, &cfg80211_rdev_list, list) 114 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0) 115 return -EINVAL; 116 117 return 0; 118 } 119 120 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, 121 char *newname) 122 { 123 int result; 124 125 ASSERT_RTNL(); 126 127 /* Ignore nop renames */ 128 if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0) 129 return 0; 130 131 result = cfg80211_dev_check_name(rdev, newname); 132 if (result < 0) 133 return result; 134 135 result = device_rename(&rdev->wiphy.dev, newname); 136 if (result) 137 return result; 138 139 if (rdev->wiphy.debugfsdir && 140 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent, 141 rdev->wiphy.debugfsdir, 142 rdev->wiphy.debugfsdir->d_parent, 143 newname)) 144 pr_err("failed to rename debugfs dir to %s!\n", newname); 145 146 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 147 148 return 0; 149 } 150 151 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, 152 struct net *net) 153 { 154 struct wireless_dev *wdev; 155 int err = 0; 156 157 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK)) 158 return -EOPNOTSUPP; 159 160 list_for_each_entry(wdev, &rdev->wdev_list, list) { 161 if (!wdev->netdev) 162 continue; 163 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 164 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); 165 if (err) 166 break; 167 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 168 } 169 170 if (err) { 171 /* failed -- clean up to old netns */ 172 net = wiphy_net(&rdev->wiphy); 173 174 list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list, 175 list) { 176 if (!wdev->netdev) 177 continue; 178 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 179 err = dev_change_net_namespace(wdev->netdev, net, 180 "wlan%d"); 181 WARN_ON(err); 182 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 183 } 184 185 return err; 186 } 187 188 wiphy_net_set(&rdev->wiphy, net); 189 190 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev)); 191 WARN_ON(err); 192 193 return 0; 194 } 195 196 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data) 197 { 198 struct cfg80211_registered_device *rdev = data; 199 200 rdev_rfkill_poll(rdev); 201 } 202 203 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev, 204 struct wireless_dev *wdev) 205 { 206 ASSERT_RTNL(); 207 208 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE)) 209 return; 210 211 if (!wdev->p2p_started) 212 return; 213 214 rdev_stop_p2p_device(rdev, wdev); 215 wdev->p2p_started = false; 216 217 rdev->opencount--; 218 219 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 220 if (WARN_ON(!rdev->scan_req->notified)) 221 rdev->scan_req->aborted = true; 222 ___cfg80211_scan_done(rdev, false); 223 } 224 } 225 226 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy) 227 { 228 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 229 struct wireless_dev *wdev; 230 231 ASSERT_RTNL(); 232 233 list_for_each_entry(wdev, &rdev->wdev_list, list) { 234 if (wdev->netdev) { 235 dev_close(wdev->netdev); 236 continue; 237 } 238 /* otherwise, check iftype */ 239 switch (wdev->iftype) { 240 case NL80211_IFTYPE_P2P_DEVICE: 241 cfg80211_stop_p2p_device(rdev, wdev); 242 break; 243 default: 244 break; 245 } 246 } 247 } 248 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces); 249 250 static int cfg80211_rfkill_set_block(void *data, bool blocked) 251 { 252 struct cfg80211_registered_device *rdev = data; 253 254 if (!blocked) 255 return 0; 256 257 rtnl_lock(); 258 cfg80211_shutdown_all_interfaces(&rdev->wiphy); 259 rtnl_unlock(); 260 261 return 0; 262 } 263 264 static void cfg80211_rfkill_sync_work(struct work_struct *work) 265 { 266 struct cfg80211_registered_device *rdev; 267 268 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync); 269 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill)); 270 } 271 272 static void cfg80211_event_work(struct work_struct *work) 273 { 274 struct cfg80211_registered_device *rdev; 275 276 rdev = container_of(work, struct cfg80211_registered_device, 277 event_work); 278 279 rtnl_lock(); 280 cfg80211_process_rdev_events(rdev); 281 rtnl_unlock(); 282 } 283 284 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev) 285 { 286 struct cfg80211_iface_destroy *item; 287 288 ASSERT_RTNL(); 289 290 spin_lock_irq(&rdev->destroy_list_lock); 291 while ((item = list_first_entry_or_null(&rdev->destroy_list, 292 struct cfg80211_iface_destroy, 293 list))) { 294 struct wireless_dev *wdev, *tmp; 295 u32 nlportid = item->nlportid; 296 297 list_del(&item->list); 298 kfree(item); 299 spin_unlock_irq(&rdev->destroy_list_lock); 300 301 list_for_each_entry_safe(wdev, tmp, &rdev->wdev_list, list) { 302 if (nlportid == wdev->owner_nlportid) 303 rdev_del_virtual_intf(rdev, wdev); 304 } 305 306 spin_lock_irq(&rdev->destroy_list_lock); 307 } 308 spin_unlock_irq(&rdev->destroy_list_lock); 309 } 310 311 static void cfg80211_destroy_iface_wk(struct work_struct *work) 312 { 313 struct cfg80211_registered_device *rdev; 314 315 rdev = container_of(work, struct cfg80211_registered_device, 316 destroy_work); 317 318 rtnl_lock(); 319 cfg80211_destroy_ifaces(rdev); 320 rtnl_unlock(); 321 } 322 323 static void cfg80211_sched_scan_stop_wk(struct work_struct *work) 324 { 325 struct cfg80211_registered_device *rdev; 326 327 rdev = container_of(work, struct cfg80211_registered_device, 328 sched_scan_stop_wk); 329 330 rtnl_lock(); 331 332 __cfg80211_stop_sched_scan(rdev, false); 333 334 rtnl_unlock(); 335 } 336 337 /* exported functions */ 338 339 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, 340 const char *requested_name) 341 { 342 static atomic_t wiphy_counter = ATOMIC_INIT(0); 343 344 struct cfg80211_registered_device *rdev; 345 int alloc_size; 346 347 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 348 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 349 WARN_ON(ops->connect && !ops->disconnect); 350 WARN_ON(ops->join_ibss && !ops->leave_ibss); 351 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 352 WARN_ON(ops->add_station && !ops->del_station); 353 WARN_ON(ops->add_mpath && !ops->del_mpath); 354 WARN_ON(ops->join_mesh && !ops->leave_mesh); 355 356 alloc_size = sizeof(*rdev) + sizeof_priv; 357 358 rdev = kzalloc(alloc_size, GFP_KERNEL); 359 if (!rdev) 360 return NULL; 361 362 rdev->ops = ops; 363 364 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 365 366 if (unlikely(rdev->wiphy_idx < 0)) { 367 /* ugh, wrapped! */ 368 atomic_dec(&wiphy_counter); 369 kfree(rdev); 370 return NULL; 371 } 372 373 /* atomic_inc_return makes it start at 1, make it start at 0 */ 374 rdev->wiphy_idx--; 375 376 /* give it a proper name */ 377 if (requested_name && requested_name[0]) { 378 int rv; 379 380 rtnl_lock(); 381 rv = cfg80211_dev_check_name(rdev, requested_name); 382 383 if (rv < 0) { 384 rtnl_unlock(); 385 goto use_default_name; 386 } 387 388 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); 389 rtnl_unlock(); 390 if (rv) 391 goto use_default_name; 392 } else { 393 use_default_name: 394 /* NOTE: This is *probably* safe w/out holding rtnl because of 395 * the restrictions on phy names. Probably this call could 396 * fail if some other part of the kernel (re)named a device 397 * phyX. But, might should add some locking and check return 398 * value, and use a different name if this one exists? 399 */ 400 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 401 } 402 403 INIT_LIST_HEAD(&rdev->wdev_list); 404 INIT_LIST_HEAD(&rdev->beacon_registrations); 405 spin_lock_init(&rdev->beacon_registrations_lock); 406 spin_lock_init(&rdev->bss_lock); 407 INIT_LIST_HEAD(&rdev->bss_list); 408 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 409 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results); 410 INIT_LIST_HEAD(&rdev->mlme_unreg); 411 spin_lock_init(&rdev->mlme_unreg_lock); 412 INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk); 413 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 414 cfg80211_dfs_channels_update_work); 415 #ifdef CONFIG_CFG80211_WEXT 416 rdev->wiphy.wext = &cfg80211_wext_handler; 417 #endif 418 419 device_initialize(&rdev->wiphy.dev); 420 rdev->wiphy.dev.class = &ieee80211_class; 421 rdev->wiphy.dev.platform_data = rdev; 422 423 INIT_LIST_HEAD(&rdev->destroy_list); 424 spin_lock_init(&rdev->destroy_list_lock); 425 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 426 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 427 428 #ifdef CONFIG_CFG80211_DEFAULT_PS 429 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 430 #endif 431 432 wiphy_net_set(&rdev->wiphy, &init_net); 433 434 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 435 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 436 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 437 &rdev->rfkill_ops, rdev); 438 439 if (!rdev->rfkill) { 440 kfree(rdev); 441 return NULL; 442 } 443 444 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); 445 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 446 INIT_WORK(&rdev->event_work, cfg80211_event_work); 447 448 init_waitqueue_head(&rdev->dev_wait); 449 450 /* 451 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 452 * Fragmentation and RTS threshold are disabled by default with the 453 * special -1 value. 454 */ 455 rdev->wiphy.retry_short = 7; 456 rdev->wiphy.retry_long = 4; 457 rdev->wiphy.frag_threshold = (u32) -1; 458 rdev->wiphy.rts_threshold = (u32) -1; 459 rdev->wiphy.coverage_class = 0; 460 461 rdev->wiphy.max_num_csa_counters = 1; 462 463 return &rdev->wiphy; 464 } 465 EXPORT_SYMBOL(wiphy_new_nm); 466 467 static int wiphy_verify_combinations(struct wiphy *wiphy) 468 { 469 const struct ieee80211_iface_combination *c; 470 int i, j; 471 472 for (i = 0; i < wiphy->n_iface_combinations; i++) { 473 u32 cnt = 0; 474 u16 all_iftypes = 0; 475 476 c = &wiphy->iface_combinations[i]; 477 478 /* 479 * Combinations with just one interface aren't real, 480 * however we make an exception for DFS. 481 */ 482 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 483 return -EINVAL; 484 485 /* Need at least one channel */ 486 if (WARN_ON(!c->num_different_channels)) 487 return -EINVAL; 488 489 /* 490 * Put a sane limit on maximum number of different 491 * channels to simplify channel accounting code. 492 */ 493 if (WARN_ON(c->num_different_channels > 494 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 495 return -EINVAL; 496 497 /* DFS only works on one channel. */ 498 if (WARN_ON(c->radar_detect_widths && 499 (c->num_different_channels > 1))) 500 return -EINVAL; 501 502 if (WARN_ON(!c->n_limits)) 503 return -EINVAL; 504 505 for (j = 0; j < c->n_limits; j++) { 506 u16 types = c->limits[j].types; 507 508 /* interface types shouldn't overlap */ 509 if (WARN_ON(types & all_iftypes)) 510 return -EINVAL; 511 all_iftypes |= types; 512 513 if (WARN_ON(!c->limits[j].max)) 514 return -EINVAL; 515 516 /* Shouldn't list software iftypes in combinations! */ 517 if (WARN_ON(wiphy->software_iftypes & types)) 518 return -EINVAL; 519 520 /* Only a single P2P_DEVICE can be allowed */ 521 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 522 c->limits[j].max > 1)) 523 return -EINVAL; 524 525 cnt += c->limits[j].max; 526 /* 527 * Don't advertise an unsupported type 528 * in a combination. 529 */ 530 if (WARN_ON((wiphy->interface_modes & types) != types)) 531 return -EINVAL; 532 } 533 534 /* You can't even choose that many! */ 535 if (WARN_ON(cnt < c->max_interfaces)) 536 return -EINVAL; 537 } 538 539 return 0; 540 } 541 542 int wiphy_register(struct wiphy *wiphy) 543 { 544 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 545 int res; 546 enum ieee80211_band band; 547 struct ieee80211_supported_band *sband; 548 bool have_band = false; 549 int i; 550 u16 ifmodes = wiphy->interface_modes; 551 552 #ifdef CONFIG_PM 553 if (WARN_ON(wiphy->wowlan && 554 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 555 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 556 return -EINVAL; 557 if (WARN_ON(wiphy->wowlan && 558 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 559 !wiphy->wowlan->tcp)) 560 return -EINVAL; 561 #endif 562 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 563 (!rdev->ops->tdls_channel_switch || 564 !rdev->ops->tdls_cancel_channel_switch))) 565 return -EINVAL; 566 567 /* 568 * if a wiphy has unsupported modes for regulatory channel enforcement, 569 * opt-out of enforcement checking 570 */ 571 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) | 572 BIT(NL80211_IFTYPE_P2P_CLIENT) | 573 BIT(NL80211_IFTYPE_AP) | 574 BIT(NL80211_IFTYPE_P2P_GO) | 575 BIT(NL80211_IFTYPE_ADHOC) | 576 BIT(NL80211_IFTYPE_P2P_DEVICE) | 577 BIT(NL80211_IFTYPE_AP_VLAN) | 578 BIT(NL80211_IFTYPE_MONITOR))) 579 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF; 580 581 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 582 (wiphy->regulatory_flags & 583 (REGULATORY_CUSTOM_REG | 584 REGULATORY_STRICT_REG | 585 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 586 REGULATORY_COUNTRY_IE_IGNORE)))) 587 return -EINVAL; 588 589 if (WARN_ON(wiphy->coalesce && 590 (!wiphy->coalesce->n_rules || 591 !wiphy->coalesce->n_patterns) && 592 (!wiphy->coalesce->pattern_min_len || 593 wiphy->coalesce->pattern_min_len > 594 wiphy->coalesce->pattern_max_len))) 595 return -EINVAL; 596 597 if (WARN_ON(wiphy->ap_sme_capa && 598 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 599 return -EINVAL; 600 601 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 602 return -EINVAL; 603 604 if (WARN_ON(wiphy->addresses && 605 !is_zero_ether_addr(wiphy->perm_addr) && 606 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 607 ETH_ALEN))) 608 return -EINVAL; 609 610 if (WARN_ON(wiphy->max_acl_mac_addrs && 611 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 612 !rdev->ops->set_mac_acl))) 613 return -EINVAL; 614 615 if (wiphy->addresses) 616 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 617 618 /* sanity check ifmodes */ 619 WARN_ON(!ifmodes); 620 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 621 if (WARN_ON(ifmodes != wiphy->interface_modes)) 622 wiphy->interface_modes = ifmodes; 623 624 res = wiphy_verify_combinations(wiphy); 625 if (res) 626 return res; 627 628 /* sanity check supported bands/channels */ 629 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 630 sband = wiphy->bands[band]; 631 if (!sband) 632 continue; 633 634 sband->band = band; 635 if (WARN_ON(!sband->n_channels)) 636 return -EINVAL; 637 /* 638 * on 60gHz band, there are no legacy rates, so 639 * n_bitrates is 0 640 */ 641 if (WARN_ON(band != IEEE80211_BAND_60GHZ && 642 !sband->n_bitrates)) 643 return -EINVAL; 644 645 /* 646 * Since cfg80211_disable_40mhz_24ghz is global, we can 647 * modify the sband's ht data even if the driver uses a 648 * global structure for that. 649 */ 650 if (cfg80211_disable_40mhz_24ghz && 651 band == IEEE80211_BAND_2GHZ && 652 sband->ht_cap.ht_supported) { 653 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 654 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 655 } 656 657 /* 658 * Since we use a u32 for rate bitmaps in 659 * ieee80211_get_response_rate, we cannot 660 * have more than 32 legacy rates. 661 */ 662 if (WARN_ON(sband->n_bitrates > 32)) 663 return -EINVAL; 664 665 for (i = 0; i < sband->n_channels; i++) { 666 sband->channels[i].orig_flags = 667 sband->channels[i].flags; 668 sband->channels[i].orig_mag = INT_MAX; 669 sband->channels[i].orig_mpwr = 670 sband->channels[i].max_power; 671 sband->channels[i].band = band; 672 } 673 674 have_band = true; 675 } 676 677 if (!have_band) { 678 WARN_ON(1); 679 return -EINVAL; 680 } 681 682 #ifdef CONFIG_PM 683 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 684 (!rdev->wiphy.wowlan->pattern_min_len || 685 rdev->wiphy.wowlan->pattern_min_len > 686 rdev->wiphy.wowlan->pattern_max_len))) 687 return -EINVAL; 688 #endif 689 690 /* check and set up bitrates */ 691 ieee80211_set_bitrate_flags(wiphy); 692 693 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 694 695 rtnl_lock(); 696 res = device_add(&rdev->wiphy.dev); 697 if (res) { 698 rtnl_unlock(); 699 return res; 700 } 701 702 /* set up regulatory info */ 703 wiphy_regulatory_register(wiphy); 704 705 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 706 cfg80211_rdev_list_generation++; 707 708 /* add to debugfs */ 709 rdev->wiphy.debugfsdir = 710 debugfs_create_dir(wiphy_name(&rdev->wiphy), 711 ieee80211_debugfs_dir); 712 if (IS_ERR(rdev->wiphy.debugfsdir)) 713 rdev->wiphy.debugfsdir = NULL; 714 715 cfg80211_debugfs_rdev_add(rdev); 716 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 717 718 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 719 struct regulatory_request request; 720 721 request.wiphy_idx = get_wiphy_idx(wiphy); 722 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 723 request.alpha2[0] = '9'; 724 request.alpha2[1] = '9'; 725 726 nl80211_send_reg_change_event(&request); 727 } 728 729 rdev->wiphy.registered = true; 730 rtnl_unlock(); 731 732 res = rfkill_register(rdev->rfkill); 733 if (res) { 734 rfkill_destroy(rdev->rfkill); 735 rdev->rfkill = NULL; 736 wiphy_unregister(&rdev->wiphy); 737 return res; 738 } 739 740 return 0; 741 } 742 EXPORT_SYMBOL(wiphy_register); 743 744 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 745 { 746 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 747 748 if (!rdev->ops->rfkill_poll) 749 return; 750 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 751 rfkill_resume_polling(rdev->rfkill); 752 } 753 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 754 755 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 756 { 757 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 758 759 rfkill_pause_polling(rdev->rfkill); 760 } 761 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 762 763 void wiphy_unregister(struct wiphy *wiphy) 764 { 765 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 766 767 wait_event(rdev->dev_wait, ({ 768 int __count; 769 rtnl_lock(); 770 __count = rdev->opencount; 771 rtnl_unlock(); 772 __count == 0; })); 773 774 if (rdev->rfkill) 775 rfkill_unregister(rdev->rfkill); 776 777 rtnl_lock(); 778 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 779 rdev->wiphy.registered = false; 780 781 WARN_ON(!list_empty(&rdev->wdev_list)); 782 783 /* 784 * First remove the hardware from everywhere, this makes 785 * it impossible to find from userspace. 786 */ 787 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 788 list_del_rcu(&rdev->list); 789 synchronize_rcu(); 790 791 /* 792 * If this device got a regulatory hint tell core its 793 * free to listen now to a new shiny device regulatory hint 794 */ 795 wiphy_regulatory_deregister(wiphy); 796 797 cfg80211_rdev_list_generation++; 798 device_del(&rdev->wiphy.dev); 799 800 rtnl_unlock(); 801 802 flush_work(&rdev->scan_done_wk); 803 cancel_work_sync(&rdev->conn_work); 804 flush_work(&rdev->event_work); 805 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 806 flush_work(&rdev->destroy_work); 807 flush_work(&rdev->sched_scan_stop_wk); 808 flush_work(&rdev->mlme_unreg_wk); 809 810 #ifdef CONFIG_PM 811 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 812 rdev_set_wakeup(rdev, false); 813 #endif 814 cfg80211_rdev_free_wowlan(rdev); 815 cfg80211_rdev_free_coalesce(rdev); 816 } 817 EXPORT_SYMBOL(wiphy_unregister); 818 819 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 820 { 821 struct cfg80211_internal_bss *scan, *tmp; 822 struct cfg80211_beacon_registration *reg, *treg; 823 rfkill_destroy(rdev->rfkill); 824 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 825 list_del(®->list); 826 kfree(reg); 827 } 828 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 829 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 830 kfree(rdev); 831 } 832 833 void wiphy_free(struct wiphy *wiphy) 834 { 835 put_device(&wiphy->dev); 836 } 837 EXPORT_SYMBOL(wiphy_free); 838 839 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 840 { 841 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 842 843 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 844 schedule_work(&rdev->rfkill_sync); 845 } 846 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 847 848 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 849 { 850 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 851 852 ASSERT_RTNL(); 853 854 if (WARN_ON(wdev->netdev)) 855 return; 856 857 list_del_rcu(&wdev->list); 858 rdev->devlist_generation++; 859 860 switch (wdev->iftype) { 861 case NL80211_IFTYPE_P2P_DEVICE: 862 cfg80211_mlme_purge_registrations(wdev); 863 cfg80211_stop_p2p_device(rdev, wdev); 864 break; 865 default: 866 WARN_ON_ONCE(1); 867 break; 868 } 869 } 870 EXPORT_SYMBOL(cfg80211_unregister_wdev); 871 872 static const struct device_type wiphy_type = { 873 .name = "wlan", 874 }; 875 876 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 877 enum nl80211_iftype iftype, int num) 878 { 879 ASSERT_RTNL(); 880 881 rdev->num_running_ifaces += num; 882 if (iftype == NL80211_IFTYPE_MONITOR) 883 rdev->num_running_monitor_ifaces += num; 884 } 885 886 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 887 struct wireless_dev *wdev) 888 { 889 struct net_device *dev = wdev->netdev; 890 struct cfg80211_sched_scan_request *sched_scan_req; 891 892 ASSERT_RTNL(); 893 ASSERT_WDEV_LOCK(wdev); 894 895 switch (wdev->iftype) { 896 case NL80211_IFTYPE_ADHOC: 897 __cfg80211_leave_ibss(rdev, dev, true); 898 break; 899 case NL80211_IFTYPE_P2P_CLIENT: 900 case NL80211_IFTYPE_STATION: 901 sched_scan_req = rtnl_dereference(rdev->sched_scan_req); 902 if (sched_scan_req && dev == sched_scan_req->dev) 903 __cfg80211_stop_sched_scan(rdev, false); 904 905 #ifdef CONFIG_CFG80211_WEXT 906 kfree(wdev->wext.ie); 907 wdev->wext.ie = NULL; 908 wdev->wext.ie_len = 0; 909 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 910 #endif 911 cfg80211_disconnect(rdev, dev, 912 WLAN_REASON_DEAUTH_LEAVING, true); 913 break; 914 case NL80211_IFTYPE_MESH_POINT: 915 __cfg80211_leave_mesh(rdev, dev); 916 break; 917 case NL80211_IFTYPE_AP: 918 case NL80211_IFTYPE_P2P_GO: 919 __cfg80211_stop_ap(rdev, dev, true); 920 break; 921 case NL80211_IFTYPE_OCB: 922 __cfg80211_leave_ocb(rdev, dev); 923 break; 924 case NL80211_IFTYPE_WDS: 925 /* must be handled by mac80211/driver, has no APIs */ 926 break; 927 case NL80211_IFTYPE_P2P_DEVICE: 928 /* cannot happen, has no netdev */ 929 break; 930 case NL80211_IFTYPE_AP_VLAN: 931 case NL80211_IFTYPE_MONITOR: 932 /* nothing to do */ 933 break; 934 case NL80211_IFTYPE_UNSPECIFIED: 935 case NUM_NL80211_IFTYPES: 936 /* invalid */ 937 break; 938 } 939 } 940 941 void cfg80211_leave(struct cfg80211_registered_device *rdev, 942 struct wireless_dev *wdev) 943 { 944 wdev_lock(wdev); 945 __cfg80211_leave(rdev, wdev); 946 wdev_unlock(wdev); 947 } 948 949 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 950 gfp_t gfp) 951 { 952 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 953 struct cfg80211_event *ev; 954 unsigned long flags; 955 956 trace_cfg80211_stop_iface(wiphy, wdev); 957 958 ev = kzalloc(sizeof(*ev), gfp); 959 if (!ev) 960 return; 961 962 ev->type = EVENT_STOPPED; 963 964 spin_lock_irqsave(&wdev->event_lock, flags); 965 list_add_tail(&ev->list, &wdev->event_list); 966 spin_unlock_irqrestore(&wdev->event_lock, flags); 967 queue_work(cfg80211_wq, &rdev->event_work); 968 } 969 EXPORT_SYMBOL(cfg80211_stop_iface); 970 971 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 972 unsigned long state, void *ptr) 973 { 974 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 975 struct wireless_dev *wdev = dev->ieee80211_ptr; 976 struct cfg80211_registered_device *rdev; 977 struct cfg80211_sched_scan_request *sched_scan_req; 978 979 if (!wdev) 980 return NOTIFY_DONE; 981 982 rdev = wiphy_to_rdev(wdev->wiphy); 983 984 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 985 986 switch (state) { 987 case NETDEV_POST_INIT: 988 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 989 break; 990 case NETDEV_REGISTER: 991 /* 992 * NB: cannot take rdev->mtx here because this may be 993 * called within code protected by it when interfaces 994 * are added with nl80211. 995 */ 996 mutex_init(&wdev->mtx); 997 INIT_LIST_HEAD(&wdev->event_list); 998 spin_lock_init(&wdev->event_lock); 999 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1000 spin_lock_init(&wdev->mgmt_registrations_lock); 1001 1002 wdev->identifier = ++rdev->wdev_id; 1003 list_add_rcu(&wdev->list, &rdev->wdev_list); 1004 rdev->devlist_generation++; 1005 /* can only change netns with wiphy */ 1006 dev->features |= NETIF_F_NETNS_LOCAL; 1007 1008 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 1009 "phy80211")) { 1010 pr_err("failed to add phy80211 symlink to netdev!\n"); 1011 } 1012 wdev->netdev = dev; 1013 #ifdef CONFIG_CFG80211_WEXT 1014 wdev->wext.default_key = -1; 1015 wdev->wext.default_mgmt_key = -1; 1016 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1017 #endif 1018 1019 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1020 wdev->ps = true; 1021 else 1022 wdev->ps = false; 1023 /* allow mac80211 to determine the timeout */ 1024 wdev->ps_timeout = -1; 1025 1026 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1027 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1028 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1029 dev->priv_flags |= IFF_DONT_BRIDGE; 1030 break; 1031 case NETDEV_GOING_DOWN: 1032 cfg80211_leave(rdev, wdev); 1033 break; 1034 case NETDEV_DOWN: 1035 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1036 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1037 if (WARN_ON(!rdev->scan_req->notified)) 1038 rdev->scan_req->aborted = true; 1039 ___cfg80211_scan_done(rdev, false); 1040 } 1041 1042 sched_scan_req = rtnl_dereference(rdev->sched_scan_req); 1043 if (WARN_ON(sched_scan_req && 1044 sched_scan_req->dev == wdev->netdev)) { 1045 __cfg80211_stop_sched_scan(rdev, false); 1046 } 1047 1048 rdev->opencount--; 1049 wake_up(&rdev->dev_wait); 1050 break; 1051 case NETDEV_UP: 1052 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1053 wdev_lock(wdev); 1054 switch (wdev->iftype) { 1055 #ifdef CONFIG_CFG80211_WEXT 1056 case NL80211_IFTYPE_ADHOC: 1057 cfg80211_ibss_wext_join(rdev, wdev); 1058 break; 1059 case NL80211_IFTYPE_STATION: 1060 cfg80211_mgd_wext_connect(rdev, wdev); 1061 break; 1062 #endif 1063 #ifdef CONFIG_MAC80211_MESH 1064 case NL80211_IFTYPE_MESH_POINT: 1065 { 1066 /* backward compat code... */ 1067 struct mesh_setup setup; 1068 memcpy(&setup, &default_mesh_setup, 1069 sizeof(setup)); 1070 /* back compat only needed for mesh_id */ 1071 setup.mesh_id = wdev->ssid; 1072 setup.mesh_id_len = wdev->mesh_id_up_len; 1073 if (wdev->mesh_id_up_len) 1074 __cfg80211_join_mesh(rdev, dev, 1075 &setup, 1076 &default_mesh_config); 1077 break; 1078 } 1079 #endif 1080 default: 1081 break; 1082 } 1083 wdev_unlock(wdev); 1084 rdev->opencount++; 1085 1086 /* 1087 * Configure power management to the driver here so that its 1088 * correctly set also after interface type changes etc. 1089 */ 1090 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1091 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1092 rdev->ops->set_power_mgmt) 1093 if (rdev_set_power_mgmt(rdev, dev, wdev->ps, 1094 wdev->ps_timeout)) { 1095 /* assume this means it's off */ 1096 wdev->ps = false; 1097 } 1098 break; 1099 case NETDEV_UNREGISTER: 1100 /* 1101 * It is possible to get NETDEV_UNREGISTER 1102 * multiple times. To detect that, check 1103 * that the interface is still on the list 1104 * of registered interfaces, and only then 1105 * remove and clean it up. 1106 */ 1107 if (!list_empty(&wdev->list)) { 1108 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 1109 list_del_rcu(&wdev->list); 1110 rdev->devlist_generation++; 1111 cfg80211_mlme_purge_registrations(wdev); 1112 #ifdef CONFIG_CFG80211_WEXT 1113 kzfree(wdev->wext.keys); 1114 #endif 1115 } 1116 /* 1117 * synchronise (so that we won't find this netdev 1118 * from other code any more) and then clear the list 1119 * head so that the above code can safely check for 1120 * !list_empty() to avoid double-cleanup. 1121 */ 1122 synchronize_rcu(); 1123 INIT_LIST_HEAD(&wdev->list); 1124 /* 1125 * Ensure that all events have been processed and 1126 * freed. 1127 */ 1128 cfg80211_process_wdev_events(wdev); 1129 1130 if (WARN_ON(wdev->current_bss)) { 1131 cfg80211_unhold_bss(wdev->current_bss); 1132 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 1133 wdev->current_bss = NULL; 1134 } 1135 break; 1136 case NETDEV_PRE_UP: 1137 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 1138 return notifier_from_errno(-EOPNOTSUPP); 1139 if (rfkill_blocked(rdev->rfkill)) 1140 return notifier_from_errno(-ERFKILL); 1141 break; 1142 default: 1143 return NOTIFY_DONE; 1144 } 1145 1146 return NOTIFY_OK; 1147 } 1148 1149 static struct notifier_block cfg80211_netdev_notifier = { 1150 .notifier_call = cfg80211_netdev_notifier_call, 1151 }; 1152 1153 static void __net_exit cfg80211_pernet_exit(struct net *net) 1154 { 1155 struct cfg80211_registered_device *rdev; 1156 1157 rtnl_lock(); 1158 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1159 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1160 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1161 } 1162 rtnl_unlock(); 1163 } 1164 1165 static struct pernet_operations cfg80211_pernet_ops = { 1166 .exit = cfg80211_pernet_exit, 1167 }; 1168 1169 static int __init cfg80211_init(void) 1170 { 1171 int err; 1172 1173 err = register_pernet_device(&cfg80211_pernet_ops); 1174 if (err) 1175 goto out_fail_pernet; 1176 1177 err = wiphy_sysfs_init(); 1178 if (err) 1179 goto out_fail_sysfs; 1180 1181 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1182 if (err) 1183 goto out_fail_notifier; 1184 1185 err = nl80211_init(); 1186 if (err) 1187 goto out_fail_nl80211; 1188 1189 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1190 1191 err = regulatory_init(); 1192 if (err) 1193 goto out_fail_reg; 1194 1195 cfg80211_wq = create_singlethread_workqueue("cfg80211"); 1196 if (!cfg80211_wq) { 1197 err = -ENOMEM; 1198 goto out_fail_wq; 1199 } 1200 1201 return 0; 1202 1203 out_fail_wq: 1204 regulatory_exit(); 1205 out_fail_reg: 1206 debugfs_remove(ieee80211_debugfs_dir); 1207 nl80211_exit(); 1208 out_fail_nl80211: 1209 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1210 out_fail_notifier: 1211 wiphy_sysfs_exit(); 1212 out_fail_sysfs: 1213 unregister_pernet_device(&cfg80211_pernet_ops); 1214 out_fail_pernet: 1215 return err; 1216 } 1217 subsys_initcall(cfg80211_init); 1218 1219 static void __exit cfg80211_exit(void) 1220 { 1221 debugfs_remove(ieee80211_debugfs_dir); 1222 nl80211_exit(); 1223 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1224 wiphy_sysfs_exit(); 1225 regulatory_exit(); 1226 unregister_pernet_device(&cfg80211_pernet_ops); 1227 destroy_workqueue(cfg80211_wq); 1228 } 1229 module_exit(cfg80211_exit); 1230