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 device_enable_async_suspend(&rdev->wiphy.dev); 423 424 INIT_LIST_HEAD(&rdev->destroy_list); 425 spin_lock_init(&rdev->destroy_list_lock); 426 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 427 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 428 429 #ifdef CONFIG_CFG80211_DEFAULT_PS 430 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 431 #endif 432 433 wiphy_net_set(&rdev->wiphy, &init_net); 434 435 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 436 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 437 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 438 &rdev->rfkill_ops, rdev); 439 440 if (!rdev->rfkill) { 441 kfree(rdev); 442 return NULL; 443 } 444 445 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); 446 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 447 INIT_WORK(&rdev->event_work, cfg80211_event_work); 448 449 init_waitqueue_head(&rdev->dev_wait); 450 451 /* 452 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 453 * Fragmentation and RTS threshold are disabled by default with the 454 * special -1 value. 455 */ 456 rdev->wiphy.retry_short = 7; 457 rdev->wiphy.retry_long = 4; 458 rdev->wiphy.frag_threshold = (u32) -1; 459 rdev->wiphy.rts_threshold = (u32) -1; 460 rdev->wiphy.coverage_class = 0; 461 462 rdev->wiphy.max_num_csa_counters = 1; 463 464 rdev->wiphy.max_sched_scan_plans = 1; 465 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 466 467 return &rdev->wiphy; 468 } 469 EXPORT_SYMBOL(wiphy_new_nm); 470 471 static int wiphy_verify_combinations(struct wiphy *wiphy) 472 { 473 const struct ieee80211_iface_combination *c; 474 int i, j; 475 476 for (i = 0; i < wiphy->n_iface_combinations; i++) { 477 u32 cnt = 0; 478 u16 all_iftypes = 0; 479 480 c = &wiphy->iface_combinations[i]; 481 482 /* 483 * Combinations with just one interface aren't real, 484 * however we make an exception for DFS. 485 */ 486 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 487 return -EINVAL; 488 489 /* Need at least one channel */ 490 if (WARN_ON(!c->num_different_channels)) 491 return -EINVAL; 492 493 /* 494 * Put a sane limit on maximum number of different 495 * channels to simplify channel accounting code. 496 */ 497 if (WARN_ON(c->num_different_channels > 498 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 499 return -EINVAL; 500 501 /* DFS only works on one channel. */ 502 if (WARN_ON(c->radar_detect_widths && 503 (c->num_different_channels > 1))) 504 return -EINVAL; 505 506 if (WARN_ON(!c->n_limits)) 507 return -EINVAL; 508 509 for (j = 0; j < c->n_limits; j++) { 510 u16 types = c->limits[j].types; 511 512 /* interface types shouldn't overlap */ 513 if (WARN_ON(types & all_iftypes)) 514 return -EINVAL; 515 all_iftypes |= types; 516 517 if (WARN_ON(!c->limits[j].max)) 518 return -EINVAL; 519 520 /* Shouldn't list software iftypes in combinations! */ 521 if (WARN_ON(wiphy->software_iftypes & types)) 522 return -EINVAL; 523 524 /* Only a single P2P_DEVICE can be allowed */ 525 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 526 c->limits[j].max > 1)) 527 return -EINVAL; 528 529 cnt += c->limits[j].max; 530 /* 531 * Don't advertise an unsupported type 532 * in a combination. 533 */ 534 if (WARN_ON((wiphy->interface_modes & types) != types)) 535 return -EINVAL; 536 } 537 538 /* You can't even choose that many! */ 539 if (WARN_ON(cnt < c->max_interfaces)) 540 return -EINVAL; 541 } 542 543 return 0; 544 } 545 546 int wiphy_register(struct wiphy *wiphy) 547 { 548 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 549 int res; 550 enum ieee80211_band band; 551 struct ieee80211_supported_band *sband; 552 bool have_band = false; 553 int i; 554 u16 ifmodes = wiphy->interface_modes; 555 556 #ifdef CONFIG_PM 557 if (WARN_ON(wiphy->wowlan && 558 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 559 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 560 return -EINVAL; 561 if (WARN_ON(wiphy->wowlan && 562 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 563 !wiphy->wowlan->tcp)) 564 return -EINVAL; 565 #endif 566 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 567 (!rdev->ops->tdls_channel_switch || 568 !rdev->ops->tdls_cancel_channel_switch))) 569 return -EINVAL; 570 571 /* 572 * if a wiphy has unsupported modes for regulatory channel enforcement, 573 * opt-out of enforcement checking 574 */ 575 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) | 576 BIT(NL80211_IFTYPE_P2P_CLIENT) | 577 BIT(NL80211_IFTYPE_AP) | 578 BIT(NL80211_IFTYPE_P2P_GO) | 579 BIT(NL80211_IFTYPE_ADHOC) | 580 BIT(NL80211_IFTYPE_P2P_DEVICE) | 581 BIT(NL80211_IFTYPE_AP_VLAN) | 582 BIT(NL80211_IFTYPE_MONITOR))) 583 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF; 584 585 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 586 (wiphy->regulatory_flags & 587 (REGULATORY_CUSTOM_REG | 588 REGULATORY_STRICT_REG | 589 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 590 REGULATORY_COUNTRY_IE_IGNORE)))) 591 return -EINVAL; 592 593 if (WARN_ON(wiphy->coalesce && 594 (!wiphy->coalesce->n_rules || 595 !wiphy->coalesce->n_patterns) && 596 (!wiphy->coalesce->pattern_min_len || 597 wiphy->coalesce->pattern_min_len > 598 wiphy->coalesce->pattern_max_len))) 599 return -EINVAL; 600 601 if (WARN_ON(wiphy->ap_sme_capa && 602 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 603 return -EINVAL; 604 605 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 606 return -EINVAL; 607 608 if (WARN_ON(wiphy->addresses && 609 !is_zero_ether_addr(wiphy->perm_addr) && 610 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 611 ETH_ALEN))) 612 return -EINVAL; 613 614 if (WARN_ON(wiphy->max_acl_mac_addrs && 615 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 616 !rdev->ops->set_mac_acl))) 617 return -EINVAL; 618 619 if (wiphy->addresses) 620 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 621 622 /* sanity check ifmodes */ 623 WARN_ON(!ifmodes); 624 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 625 if (WARN_ON(ifmodes != wiphy->interface_modes)) 626 wiphy->interface_modes = ifmodes; 627 628 res = wiphy_verify_combinations(wiphy); 629 if (res) 630 return res; 631 632 /* sanity check supported bands/channels */ 633 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 634 sband = wiphy->bands[band]; 635 if (!sband) 636 continue; 637 638 sband->band = band; 639 if (WARN_ON(!sband->n_channels)) 640 return -EINVAL; 641 /* 642 * on 60GHz band, there are no legacy rates, so 643 * n_bitrates is 0 644 */ 645 if (WARN_ON(band != IEEE80211_BAND_60GHZ && 646 !sband->n_bitrates)) 647 return -EINVAL; 648 649 /* 650 * Since cfg80211_disable_40mhz_24ghz is global, we can 651 * modify the sband's ht data even if the driver uses a 652 * global structure for that. 653 */ 654 if (cfg80211_disable_40mhz_24ghz && 655 band == IEEE80211_BAND_2GHZ && 656 sband->ht_cap.ht_supported) { 657 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 658 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 659 } 660 661 /* 662 * Since we use a u32 for rate bitmaps in 663 * ieee80211_get_response_rate, we cannot 664 * have more than 32 legacy rates. 665 */ 666 if (WARN_ON(sband->n_bitrates > 32)) 667 return -EINVAL; 668 669 for (i = 0; i < sband->n_channels; i++) { 670 sband->channels[i].orig_flags = 671 sband->channels[i].flags; 672 sband->channels[i].orig_mag = INT_MAX; 673 sband->channels[i].orig_mpwr = 674 sband->channels[i].max_power; 675 sband->channels[i].band = band; 676 } 677 678 have_band = true; 679 } 680 681 if (!have_band) { 682 WARN_ON(1); 683 return -EINVAL; 684 } 685 686 #ifdef CONFIG_PM 687 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 688 (!rdev->wiphy.wowlan->pattern_min_len || 689 rdev->wiphy.wowlan->pattern_min_len > 690 rdev->wiphy.wowlan->pattern_max_len))) 691 return -EINVAL; 692 #endif 693 694 /* check and set up bitrates */ 695 ieee80211_set_bitrate_flags(wiphy); 696 697 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 698 699 rtnl_lock(); 700 res = device_add(&rdev->wiphy.dev); 701 if (res) { 702 rtnl_unlock(); 703 return res; 704 } 705 706 /* set up regulatory info */ 707 wiphy_regulatory_register(wiphy); 708 709 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 710 cfg80211_rdev_list_generation++; 711 712 /* add to debugfs */ 713 rdev->wiphy.debugfsdir = 714 debugfs_create_dir(wiphy_name(&rdev->wiphy), 715 ieee80211_debugfs_dir); 716 if (IS_ERR(rdev->wiphy.debugfsdir)) 717 rdev->wiphy.debugfsdir = NULL; 718 719 cfg80211_debugfs_rdev_add(rdev); 720 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 721 722 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 723 struct regulatory_request request; 724 725 request.wiphy_idx = get_wiphy_idx(wiphy); 726 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 727 request.alpha2[0] = '9'; 728 request.alpha2[1] = '9'; 729 730 nl80211_send_reg_change_event(&request); 731 } 732 733 rdev->wiphy.registered = true; 734 rtnl_unlock(); 735 736 res = rfkill_register(rdev->rfkill); 737 if (res) { 738 rfkill_destroy(rdev->rfkill); 739 rdev->rfkill = NULL; 740 wiphy_unregister(&rdev->wiphy); 741 return res; 742 } 743 744 return 0; 745 } 746 EXPORT_SYMBOL(wiphy_register); 747 748 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 749 { 750 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 751 752 if (!rdev->ops->rfkill_poll) 753 return; 754 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 755 rfkill_resume_polling(rdev->rfkill); 756 } 757 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 758 759 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 760 { 761 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 762 763 rfkill_pause_polling(rdev->rfkill); 764 } 765 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 766 767 void wiphy_unregister(struct wiphy *wiphy) 768 { 769 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 770 771 wait_event(rdev->dev_wait, ({ 772 int __count; 773 rtnl_lock(); 774 __count = rdev->opencount; 775 rtnl_unlock(); 776 __count == 0; })); 777 778 if (rdev->rfkill) 779 rfkill_unregister(rdev->rfkill); 780 781 rtnl_lock(); 782 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 783 rdev->wiphy.registered = false; 784 785 WARN_ON(!list_empty(&rdev->wdev_list)); 786 787 /* 788 * First remove the hardware from everywhere, this makes 789 * it impossible to find from userspace. 790 */ 791 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 792 list_del_rcu(&rdev->list); 793 synchronize_rcu(); 794 795 /* 796 * If this device got a regulatory hint tell core its 797 * free to listen now to a new shiny device regulatory hint 798 */ 799 wiphy_regulatory_deregister(wiphy); 800 801 cfg80211_rdev_list_generation++; 802 device_del(&rdev->wiphy.dev); 803 804 rtnl_unlock(); 805 806 flush_work(&rdev->scan_done_wk); 807 cancel_work_sync(&rdev->conn_work); 808 flush_work(&rdev->event_work); 809 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 810 flush_work(&rdev->destroy_work); 811 flush_work(&rdev->sched_scan_stop_wk); 812 flush_work(&rdev->mlme_unreg_wk); 813 814 #ifdef CONFIG_PM 815 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 816 rdev_set_wakeup(rdev, false); 817 #endif 818 cfg80211_rdev_free_wowlan(rdev); 819 cfg80211_rdev_free_coalesce(rdev); 820 } 821 EXPORT_SYMBOL(wiphy_unregister); 822 823 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 824 { 825 struct cfg80211_internal_bss *scan, *tmp; 826 struct cfg80211_beacon_registration *reg, *treg; 827 rfkill_destroy(rdev->rfkill); 828 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 829 list_del(®->list); 830 kfree(reg); 831 } 832 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 833 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 834 kfree(rdev); 835 } 836 837 void wiphy_free(struct wiphy *wiphy) 838 { 839 put_device(&wiphy->dev); 840 } 841 EXPORT_SYMBOL(wiphy_free); 842 843 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 844 { 845 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 846 847 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 848 schedule_work(&rdev->rfkill_sync); 849 } 850 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 851 852 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 853 { 854 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 855 856 ASSERT_RTNL(); 857 858 if (WARN_ON(wdev->netdev)) 859 return; 860 861 list_del_rcu(&wdev->list); 862 rdev->devlist_generation++; 863 864 switch (wdev->iftype) { 865 case NL80211_IFTYPE_P2P_DEVICE: 866 cfg80211_mlme_purge_registrations(wdev); 867 cfg80211_stop_p2p_device(rdev, wdev); 868 break; 869 default: 870 WARN_ON_ONCE(1); 871 break; 872 } 873 } 874 EXPORT_SYMBOL(cfg80211_unregister_wdev); 875 876 static const struct device_type wiphy_type = { 877 .name = "wlan", 878 }; 879 880 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 881 enum nl80211_iftype iftype, int num) 882 { 883 ASSERT_RTNL(); 884 885 rdev->num_running_ifaces += num; 886 if (iftype == NL80211_IFTYPE_MONITOR) 887 rdev->num_running_monitor_ifaces += num; 888 } 889 890 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 891 struct wireless_dev *wdev) 892 { 893 struct net_device *dev = wdev->netdev; 894 struct cfg80211_sched_scan_request *sched_scan_req; 895 896 ASSERT_RTNL(); 897 ASSERT_WDEV_LOCK(wdev); 898 899 switch (wdev->iftype) { 900 case NL80211_IFTYPE_ADHOC: 901 __cfg80211_leave_ibss(rdev, dev, true); 902 break; 903 case NL80211_IFTYPE_P2P_CLIENT: 904 case NL80211_IFTYPE_STATION: 905 sched_scan_req = rtnl_dereference(rdev->sched_scan_req); 906 if (sched_scan_req && dev == sched_scan_req->dev) 907 __cfg80211_stop_sched_scan(rdev, false); 908 909 #ifdef CONFIG_CFG80211_WEXT 910 kfree(wdev->wext.ie); 911 wdev->wext.ie = NULL; 912 wdev->wext.ie_len = 0; 913 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 914 #endif 915 cfg80211_disconnect(rdev, dev, 916 WLAN_REASON_DEAUTH_LEAVING, true); 917 break; 918 case NL80211_IFTYPE_MESH_POINT: 919 __cfg80211_leave_mesh(rdev, dev); 920 break; 921 case NL80211_IFTYPE_AP: 922 case NL80211_IFTYPE_P2P_GO: 923 __cfg80211_stop_ap(rdev, dev, true); 924 break; 925 case NL80211_IFTYPE_OCB: 926 __cfg80211_leave_ocb(rdev, dev); 927 break; 928 case NL80211_IFTYPE_WDS: 929 /* must be handled by mac80211/driver, has no APIs */ 930 break; 931 case NL80211_IFTYPE_P2P_DEVICE: 932 /* cannot happen, has no netdev */ 933 break; 934 case NL80211_IFTYPE_AP_VLAN: 935 case NL80211_IFTYPE_MONITOR: 936 /* nothing to do */ 937 break; 938 case NL80211_IFTYPE_UNSPECIFIED: 939 case NUM_NL80211_IFTYPES: 940 /* invalid */ 941 break; 942 } 943 } 944 945 void cfg80211_leave(struct cfg80211_registered_device *rdev, 946 struct wireless_dev *wdev) 947 { 948 wdev_lock(wdev); 949 __cfg80211_leave(rdev, wdev); 950 wdev_unlock(wdev); 951 } 952 953 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 954 gfp_t gfp) 955 { 956 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 957 struct cfg80211_event *ev; 958 unsigned long flags; 959 960 trace_cfg80211_stop_iface(wiphy, wdev); 961 962 ev = kzalloc(sizeof(*ev), gfp); 963 if (!ev) 964 return; 965 966 ev->type = EVENT_STOPPED; 967 968 spin_lock_irqsave(&wdev->event_lock, flags); 969 list_add_tail(&ev->list, &wdev->event_list); 970 spin_unlock_irqrestore(&wdev->event_lock, flags); 971 queue_work(cfg80211_wq, &rdev->event_work); 972 } 973 EXPORT_SYMBOL(cfg80211_stop_iface); 974 975 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 976 unsigned long state, void *ptr) 977 { 978 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 979 struct wireless_dev *wdev = dev->ieee80211_ptr; 980 struct cfg80211_registered_device *rdev; 981 struct cfg80211_sched_scan_request *sched_scan_req; 982 983 if (!wdev) 984 return NOTIFY_DONE; 985 986 rdev = wiphy_to_rdev(wdev->wiphy); 987 988 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 989 990 switch (state) { 991 case NETDEV_POST_INIT: 992 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 993 break; 994 case NETDEV_REGISTER: 995 /* 996 * NB: cannot take rdev->mtx here because this may be 997 * called within code protected by it when interfaces 998 * are added with nl80211. 999 */ 1000 mutex_init(&wdev->mtx); 1001 INIT_LIST_HEAD(&wdev->event_list); 1002 spin_lock_init(&wdev->event_lock); 1003 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1004 spin_lock_init(&wdev->mgmt_registrations_lock); 1005 1006 wdev->identifier = ++rdev->wdev_id; 1007 list_add_rcu(&wdev->list, &rdev->wdev_list); 1008 rdev->devlist_generation++; 1009 /* can only change netns with wiphy */ 1010 dev->features |= NETIF_F_NETNS_LOCAL; 1011 1012 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 1013 "phy80211")) { 1014 pr_err("failed to add phy80211 symlink to netdev!\n"); 1015 } 1016 wdev->netdev = dev; 1017 #ifdef CONFIG_CFG80211_WEXT 1018 wdev->wext.default_key = -1; 1019 wdev->wext.default_mgmt_key = -1; 1020 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1021 #endif 1022 1023 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1024 wdev->ps = true; 1025 else 1026 wdev->ps = false; 1027 /* allow mac80211 to determine the timeout */ 1028 wdev->ps_timeout = -1; 1029 1030 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1031 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1032 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1033 dev->priv_flags |= IFF_DONT_BRIDGE; 1034 break; 1035 case NETDEV_GOING_DOWN: 1036 cfg80211_leave(rdev, wdev); 1037 break; 1038 case NETDEV_DOWN: 1039 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1040 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1041 if (WARN_ON(!rdev->scan_req->notified)) 1042 rdev->scan_req->aborted = true; 1043 ___cfg80211_scan_done(rdev, false); 1044 } 1045 1046 sched_scan_req = rtnl_dereference(rdev->sched_scan_req); 1047 if (WARN_ON(sched_scan_req && 1048 sched_scan_req->dev == wdev->netdev)) { 1049 __cfg80211_stop_sched_scan(rdev, false); 1050 } 1051 1052 rdev->opencount--; 1053 wake_up(&rdev->dev_wait); 1054 break; 1055 case NETDEV_UP: 1056 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1057 wdev_lock(wdev); 1058 switch (wdev->iftype) { 1059 #ifdef CONFIG_CFG80211_WEXT 1060 case NL80211_IFTYPE_ADHOC: 1061 cfg80211_ibss_wext_join(rdev, wdev); 1062 break; 1063 case NL80211_IFTYPE_STATION: 1064 cfg80211_mgd_wext_connect(rdev, wdev); 1065 break; 1066 #endif 1067 #ifdef CONFIG_MAC80211_MESH 1068 case NL80211_IFTYPE_MESH_POINT: 1069 { 1070 /* backward compat code... */ 1071 struct mesh_setup setup; 1072 memcpy(&setup, &default_mesh_setup, 1073 sizeof(setup)); 1074 /* back compat only needed for mesh_id */ 1075 setup.mesh_id = wdev->ssid; 1076 setup.mesh_id_len = wdev->mesh_id_up_len; 1077 if (wdev->mesh_id_up_len) 1078 __cfg80211_join_mesh(rdev, dev, 1079 &setup, 1080 &default_mesh_config); 1081 break; 1082 } 1083 #endif 1084 default: 1085 break; 1086 } 1087 wdev_unlock(wdev); 1088 rdev->opencount++; 1089 1090 /* 1091 * Configure power management to the driver here so that its 1092 * correctly set also after interface type changes etc. 1093 */ 1094 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1095 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1096 rdev->ops->set_power_mgmt) 1097 if (rdev_set_power_mgmt(rdev, dev, wdev->ps, 1098 wdev->ps_timeout)) { 1099 /* assume this means it's off */ 1100 wdev->ps = false; 1101 } 1102 break; 1103 case NETDEV_UNREGISTER: 1104 /* 1105 * It is possible to get NETDEV_UNREGISTER 1106 * multiple times. To detect that, check 1107 * that the interface is still on the list 1108 * of registered interfaces, and only then 1109 * remove and clean it up. 1110 */ 1111 if (!list_empty(&wdev->list)) { 1112 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 1113 list_del_rcu(&wdev->list); 1114 rdev->devlist_generation++; 1115 cfg80211_mlme_purge_registrations(wdev); 1116 #ifdef CONFIG_CFG80211_WEXT 1117 kzfree(wdev->wext.keys); 1118 #endif 1119 } 1120 /* 1121 * synchronise (so that we won't find this netdev 1122 * from other code any more) and then clear the list 1123 * head so that the above code can safely check for 1124 * !list_empty() to avoid double-cleanup. 1125 */ 1126 synchronize_rcu(); 1127 INIT_LIST_HEAD(&wdev->list); 1128 /* 1129 * Ensure that all events have been processed and 1130 * freed. 1131 */ 1132 cfg80211_process_wdev_events(wdev); 1133 1134 if (WARN_ON(wdev->current_bss)) { 1135 cfg80211_unhold_bss(wdev->current_bss); 1136 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 1137 wdev->current_bss = NULL; 1138 } 1139 break; 1140 case NETDEV_PRE_UP: 1141 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 1142 return notifier_from_errno(-EOPNOTSUPP); 1143 if (rfkill_blocked(rdev->rfkill)) 1144 return notifier_from_errno(-ERFKILL); 1145 break; 1146 default: 1147 return NOTIFY_DONE; 1148 } 1149 1150 return NOTIFY_OK; 1151 } 1152 1153 static struct notifier_block cfg80211_netdev_notifier = { 1154 .notifier_call = cfg80211_netdev_notifier_call, 1155 }; 1156 1157 static void __net_exit cfg80211_pernet_exit(struct net *net) 1158 { 1159 struct cfg80211_registered_device *rdev; 1160 1161 rtnl_lock(); 1162 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1163 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1164 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1165 } 1166 rtnl_unlock(); 1167 } 1168 1169 static struct pernet_operations cfg80211_pernet_ops = { 1170 .exit = cfg80211_pernet_exit, 1171 }; 1172 1173 static int __init cfg80211_init(void) 1174 { 1175 int err; 1176 1177 err = register_pernet_device(&cfg80211_pernet_ops); 1178 if (err) 1179 goto out_fail_pernet; 1180 1181 err = wiphy_sysfs_init(); 1182 if (err) 1183 goto out_fail_sysfs; 1184 1185 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1186 if (err) 1187 goto out_fail_notifier; 1188 1189 err = nl80211_init(); 1190 if (err) 1191 goto out_fail_nl80211; 1192 1193 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1194 1195 err = regulatory_init(); 1196 if (err) 1197 goto out_fail_reg; 1198 1199 cfg80211_wq = create_singlethread_workqueue("cfg80211"); 1200 if (!cfg80211_wq) { 1201 err = -ENOMEM; 1202 goto out_fail_wq; 1203 } 1204 1205 return 0; 1206 1207 out_fail_wq: 1208 regulatory_exit(); 1209 out_fail_reg: 1210 debugfs_remove(ieee80211_debugfs_dir); 1211 nl80211_exit(); 1212 out_fail_nl80211: 1213 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1214 out_fail_notifier: 1215 wiphy_sysfs_exit(); 1216 out_fail_sysfs: 1217 unregister_pernet_device(&cfg80211_pernet_ops); 1218 out_fail_pernet: 1219 return err; 1220 } 1221 subsys_initcall(cfg80211_init); 1222 1223 static void __exit cfg80211_exit(void) 1224 { 1225 debugfs_remove(ieee80211_debugfs_dir); 1226 nl80211_exit(); 1227 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1228 wiphy_sysfs_exit(); 1229 regulatory_exit(); 1230 unregister_pernet_device(&cfg80211_pernet_ops); 1231 destroy_workqueue(cfg80211_wq); 1232 } 1233 module_exit(cfg80211_exit); 1234