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_DELAYED_WORK(&rdev->dfs_update_channels_wk, 411 cfg80211_dfs_channels_update_work); 412 #ifdef CONFIG_CFG80211_WEXT 413 rdev->wiphy.wext = &cfg80211_wext_handler; 414 #endif 415 416 device_initialize(&rdev->wiphy.dev); 417 rdev->wiphy.dev.class = &ieee80211_class; 418 rdev->wiphy.dev.platform_data = rdev; 419 420 INIT_LIST_HEAD(&rdev->destroy_list); 421 spin_lock_init(&rdev->destroy_list_lock); 422 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 423 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 424 425 #ifdef CONFIG_CFG80211_DEFAULT_PS 426 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 427 #endif 428 429 wiphy_net_set(&rdev->wiphy, &init_net); 430 431 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 432 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 433 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 434 &rdev->rfkill_ops, rdev); 435 436 if (!rdev->rfkill) { 437 kfree(rdev); 438 return NULL; 439 } 440 441 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); 442 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 443 INIT_WORK(&rdev->event_work, cfg80211_event_work); 444 445 init_waitqueue_head(&rdev->dev_wait); 446 447 /* 448 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 449 * Fragmentation and RTS threshold are disabled by default with the 450 * special -1 value. 451 */ 452 rdev->wiphy.retry_short = 7; 453 rdev->wiphy.retry_long = 4; 454 rdev->wiphy.frag_threshold = (u32) -1; 455 rdev->wiphy.rts_threshold = (u32) -1; 456 rdev->wiphy.coverage_class = 0; 457 458 rdev->wiphy.max_num_csa_counters = 1; 459 460 return &rdev->wiphy; 461 } 462 EXPORT_SYMBOL(wiphy_new_nm); 463 464 static int wiphy_verify_combinations(struct wiphy *wiphy) 465 { 466 const struct ieee80211_iface_combination *c; 467 int i, j; 468 469 for (i = 0; i < wiphy->n_iface_combinations; i++) { 470 u32 cnt = 0; 471 u16 all_iftypes = 0; 472 473 c = &wiphy->iface_combinations[i]; 474 475 /* 476 * Combinations with just one interface aren't real, 477 * however we make an exception for DFS. 478 */ 479 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 480 return -EINVAL; 481 482 /* Need at least one channel */ 483 if (WARN_ON(!c->num_different_channels)) 484 return -EINVAL; 485 486 /* 487 * Put a sane limit on maximum number of different 488 * channels to simplify channel accounting code. 489 */ 490 if (WARN_ON(c->num_different_channels > 491 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 492 return -EINVAL; 493 494 /* DFS only works on one channel. */ 495 if (WARN_ON(c->radar_detect_widths && 496 (c->num_different_channels > 1))) 497 return -EINVAL; 498 499 if (WARN_ON(!c->n_limits)) 500 return -EINVAL; 501 502 for (j = 0; j < c->n_limits; j++) { 503 u16 types = c->limits[j].types; 504 505 /* interface types shouldn't overlap */ 506 if (WARN_ON(types & all_iftypes)) 507 return -EINVAL; 508 all_iftypes |= types; 509 510 if (WARN_ON(!c->limits[j].max)) 511 return -EINVAL; 512 513 /* Shouldn't list software iftypes in combinations! */ 514 if (WARN_ON(wiphy->software_iftypes & types)) 515 return -EINVAL; 516 517 /* Only a single P2P_DEVICE can be allowed */ 518 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 519 c->limits[j].max > 1)) 520 return -EINVAL; 521 522 cnt += c->limits[j].max; 523 /* 524 * Don't advertise an unsupported type 525 * in a combination. 526 */ 527 if (WARN_ON((wiphy->interface_modes & types) != types)) 528 return -EINVAL; 529 } 530 531 /* You can't even choose that many! */ 532 if (WARN_ON(cnt < c->max_interfaces)) 533 return -EINVAL; 534 } 535 536 return 0; 537 } 538 539 int wiphy_register(struct wiphy *wiphy) 540 { 541 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 542 int res; 543 enum ieee80211_band band; 544 struct ieee80211_supported_band *sband; 545 bool have_band = false; 546 int i; 547 u16 ifmodes = wiphy->interface_modes; 548 549 #ifdef CONFIG_PM 550 if (WARN_ON(wiphy->wowlan && 551 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 552 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 553 return -EINVAL; 554 if (WARN_ON(wiphy->wowlan && 555 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 556 !wiphy->wowlan->tcp)) 557 return -EINVAL; 558 #endif 559 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 560 (!rdev->ops->tdls_channel_switch || 561 !rdev->ops->tdls_cancel_channel_switch))) 562 return -EINVAL; 563 564 /* 565 * if a wiphy has unsupported modes for regulatory channel enforcement, 566 * opt-out of enforcement checking 567 */ 568 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) | 569 BIT(NL80211_IFTYPE_P2P_CLIENT) | 570 BIT(NL80211_IFTYPE_AP) | 571 BIT(NL80211_IFTYPE_P2P_GO) | 572 BIT(NL80211_IFTYPE_ADHOC) | 573 BIT(NL80211_IFTYPE_P2P_DEVICE) | 574 BIT(NL80211_IFTYPE_AP_VLAN) | 575 BIT(NL80211_IFTYPE_MONITOR))) 576 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF; 577 578 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 579 (wiphy->regulatory_flags & 580 (REGULATORY_CUSTOM_REG | 581 REGULATORY_STRICT_REG | 582 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 583 REGULATORY_COUNTRY_IE_IGNORE)))) 584 return -EINVAL; 585 586 if (WARN_ON(wiphy->coalesce && 587 (!wiphy->coalesce->n_rules || 588 !wiphy->coalesce->n_patterns) && 589 (!wiphy->coalesce->pattern_min_len || 590 wiphy->coalesce->pattern_min_len > 591 wiphy->coalesce->pattern_max_len))) 592 return -EINVAL; 593 594 if (WARN_ON(wiphy->ap_sme_capa && 595 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 596 return -EINVAL; 597 598 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 599 return -EINVAL; 600 601 if (WARN_ON(wiphy->addresses && 602 !is_zero_ether_addr(wiphy->perm_addr) && 603 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 604 ETH_ALEN))) 605 return -EINVAL; 606 607 if (WARN_ON(wiphy->max_acl_mac_addrs && 608 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 609 !rdev->ops->set_mac_acl))) 610 return -EINVAL; 611 612 if (wiphy->addresses) 613 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 614 615 /* sanity check ifmodes */ 616 WARN_ON(!ifmodes); 617 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 618 if (WARN_ON(ifmodes != wiphy->interface_modes)) 619 wiphy->interface_modes = ifmodes; 620 621 res = wiphy_verify_combinations(wiphy); 622 if (res) 623 return res; 624 625 /* sanity check supported bands/channels */ 626 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 627 sband = wiphy->bands[band]; 628 if (!sband) 629 continue; 630 631 sband->band = band; 632 if (WARN_ON(!sband->n_channels)) 633 return -EINVAL; 634 /* 635 * on 60gHz band, there are no legacy rates, so 636 * n_bitrates is 0 637 */ 638 if (WARN_ON(band != IEEE80211_BAND_60GHZ && 639 !sband->n_bitrates)) 640 return -EINVAL; 641 642 /* 643 * Since cfg80211_disable_40mhz_24ghz is global, we can 644 * modify the sband's ht data even if the driver uses a 645 * global structure for that. 646 */ 647 if (cfg80211_disable_40mhz_24ghz && 648 band == IEEE80211_BAND_2GHZ && 649 sband->ht_cap.ht_supported) { 650 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 651 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 652 } 653 654 /* 655 * Since we use a u32 for rate bitmaps in 656 * ieee80211_get_response_rate, we cannot 657 * have more than 32 legacy rates. 658 */ 659 if (WARN_ON(sband->n_bitrates > 32)) 660 return -EINVAL; 661 662 for (i = 0; i < sband->n_channels; i++) { 663 sband->channels[i].orig_flags = 664 sband->channels[i].flags; 665 sband->channels[i].orig_mag = INT_MAX; 666 sband->channels[i].orig_mpwr = 667 sband->channels[i].max_power; 668 sband->channels[i].band = band; 669 } 670 671 have_band = true; 672 } 673 674 if (!have_band) { 675 WARN_ON(1); 676 return -EINVAL; 677 } 678 679 #ifdef CONFIG_PM 680 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 681 (!rdev->wiphy.wowlan->pattern_min_len || 682 rdev->wiphy.wowlan->pattern_min_len > 683 rdev->wiphy.wowlan->pattern_max_len))) 684 return -EINVAL; 685 #endif 686 687 /* check and set up bitrates */ 688 ieee80211_set_bitrate_flags(wiphy); 689 690 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 691 692 rtnl_lock(); 693 res = device_add(&rdev->wiphy.dev); 694 if (res) { 695 rtnl_unlock(); 696 return res; 697 } 698 699 /* set up regulatory info */ 700 wiphy_regulatory_register(wiphy); 701 702 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 703 cfg80211_rdev_list_generation++; 704 705 /* add to debugfs */ 706 rdev->wiphy.debugfsdir = 707 debugfs_create_dir(wiphy_name(&rdev->wiphy), 708 ieee80211_debugfs_dir); 709 if (IS_ERR(rdev->wiphy.debugfsdir)) 710 rdev->wiphy.debugfsdir = NULL; 711 712 cfg80211_debugfs_rdev_add(rdev); 713 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 714 715 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 716 struct regulatory_request request; 717 718 request.wiphy_idx = get_wiphy_idx(wiphy); 719 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 720 request.alpha2[0] = '9'; 721 request.alpha2[1] = '9'; 722 723 nl80211_send_reg_change_event(&request); 724 } 725 726 rdev->wiphy.registered = true; 727 rtnl_unlock(); 728 729 res = rfkill_register(rdev->rfkill); 730 if (res) { 731 rfkill_destroy(rdev->rfkill); 732 rdev->rfkill = NULL; 733 wiphy_unregister(&rdev->wiphy); 734 return res; 735 } 736 737 return 0; 738 } 739 EXPORT_SYMBOL(wiphy_register); 740 741 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 742 { 743 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 744 745 if (!rdev->ops->rfkill_poll) 746 return; 747 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 748 rfkill_resume_polling(rdev->rfkill); 749 } 750 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 751 752 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 753 { 754 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 755 756 rfkill_pause_polling(rdev->rfkill); 757 } 758 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 759 760 void wiphy_unregister(struct wiphy *wiphy) 761 { 762 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 763 764 wait_event(rdev->dev_wait, ({ 765 int __count; 766 rtnl_lock(); 767 __count = rdev->opencount; 768 rtnl_unlock(); 769 __count == 0; })); 770 771 if (rdev->rfkill) 772 rfkill_unregister(rdev->rfkill); 773 774 rtnl_lock(); 775 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 776 rdev->wiphy.registered = false; 777 778 WARN_ON(!list_empty(&rdev->wdev_list)); 779 780 /* 781 * First remove the hardware from everywhere, this makes 782 * it impossible to find from userspace. 783 */ 784 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 785 list_del_rcu(&rdev->list); 786 synchronize_rcu(); 787 788 /* 789 * If this device got a regulatory hint tell core its 790 * free to listen now to a new shiny device regulatory hint 791 */ 792 wiphy_regulatory_deregister(wiphy); 793 794 cfg80211_rdev_list_generation++; 795 device_del(&rdev->wiphy.dev); 796 797 rtnl_unlock(); 798 799 flush_work(&rdev->scan_done_wk); 800 cancel_work_sync(&rdev->conn_work); 801 flush_work(&rdev->event_work); 802 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 803 flush_work(&rdev->destroy_work); 804 flush_work(&rdev->sched_scan_stop_wk); 805 806 #ifdef CONFIG_PM 807 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 808 rdev_set_wakeup(rdev, false); 809 #endif 810 cfg80211_rdev_free_wowlan(rdev); 811 cfg80211_rdev_free_coalesce(rdev); 812 } 813 EXPORT_SYMBOL(wiphy_unregister); 814 815 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 816 { 817 struct cfg80211_internal_bss *scan, *tmp; 818 struct cfg80211_beacon_registration *reg, *treg; 819 rfkill_destroy(rdev->rfkill); 820 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 821 list_del(®->list); 822 kfree(reg); 823 } 824 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 825 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 826 kfree(rdev); 827 } 828 829 void wiphy_free(struct wiphy *wiphy) 830 { 831 put_device(&wiphy->dev); 832 } 833 EXPORT_SYMBOL(wiphy_free); 834 835 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 836 { 837 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 838 839 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 840 schedule_work(&rdev->rfkill_sync); 841 } 842 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 843 844 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 845 { 846 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 847 848 ASSERT_RTNL(); 849 850 if (WARN_ON(wdev->netdev)) 851 return; 852 853 list_del_rcu(&wdev->list); 854 rdev->devlist_generation++; 855 856 switch (wdev->iftype) { 857 case NL80211_IFTYPE_P2P_DEVICE: 858 cfg80211_stop_p2p_device(rdev, wdev); 859 break; 860 default: 861 WARN_ON_ONCE(1); 862 break; 863 } 864 } 865 EXPORT_SYMBOL(cfg80211_unregister_wdev); 866 867 static const struct device_type wiphy_type = { 868 .name = "wlan", 869 }; 870 871 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 872 enum nl80211_iftype iftype, int num) 873 { 874 ASSERT_RTNL(); 875 876 rdev->num_running_ifaces += num; 877 if (iftype == NL80211_IFTYPE_MONITOR) 878 rdev->num_running_monitor_ifaces += num; 879 } 880 881 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 882 struct wireless_dev *wdev) 883 { 884 struct net_device *dev = wdev->netdev; 885 struct cfg80211_sched_scan_request *sched_scan_req; 886 887 ASSERT_RTNL(); 888 ASSERT_WDEV_LOCK(wdev); 889 890 switch (wdev->iftype) { 891 case NL80211_IFTYPE_ADHOC: 892 __cfg80211_leave_ibss(rdev, dev, true); 893 break; 894 case NL80211_IFTYPE_P2P_CLIENT: 895 case NL80211_IFTYPE_STATION: 896 sched_scan_req = rtnl_dereference(rdev->sched_scan_req); 897 if (sched_scan_req && dev == sched_scan_req->dev) 898 __cfg80211_stop_sched_scan(rdev, false); 899 900 #ifdef CONFIG_CFG80211_WEXT 901 kfree(wdev->wext.ie); 902 wdev->wext.ie = NULL; 903 wdev->wext.ie_len = 0; 904 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 905 #endif 906 cfg80211_disconnect(rdev, dev, 907 WLAN_REASON_DEAUTH_LEAVING, true); 908 break; 909 case NL80211_IFTYPE_MESH_POINT: 910 __cfg80211_leave_mesh(rdev, dev); 911 break; 912 case NL80211_IFTYPE_AP: 913 case NL80211_IFTYPE_P2P_GO: 914 __cfg80211_stop_ap(rdev, dev, true); 915 break; 916 case NL80211_IFTYPE_OCB: 917 __cfg80211_leave_ocb(rdev, dev); 918 break; 919 case NL80211_IFTYPE_WDS: 920 /* must be handled by mac80211/driver, has no APIs */ 921 break; 922 case NL80211_IFTYPE_P2P_DEVICE: 923 /* cannot happen, has no netdev */ 924 break; 925 case NL80211_IFTYPE_AP_VLAN: 926 case NL80211_IFTYPE_MONITOR: 927 /* nothing to do */ 928 break; 929 case NL80211_IFTYPE_UNSPECIFIED: 930 case NUM_NL80211_IFTYPES: 931 /* invalid */ 932 break; 933 } 934 } 935 936 void cfg80211_leave(struct cfg80211_registered_device *rdev, 937 struct wireless_dev *wdev) 938 { 939 wdev_lock(wdev); 940 __cfg80211_leave(rdev, wdev); 941 wdev_unlock(wdev); 942 } 943 944 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 945 gfp_t gfp) 946 { 947 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 948 struct cfg80211_event *ev; 949 unsigned long flags; 950 951 trace_cfg80211_stop_iface(wiphy, wdev); 952 953 ev = kzalloc(sizeof(*ev), gfp); 954 if (!ev) 955 return; 956 957 ev->type = EVENT_STOPPED; 958 959 spin_lock_irqsave(&wdev->event_lock, flags); 960 list_add_tail(&ev->list, &wdev->event_list); 961 spin_unlock_irqrestore(&wdev->event_lock, flags); 962 queue_work(cfg80211_wq, &rdev->event_work); 963 } 964 EXPORT_SYMBOL(cfg80211_stop_iface); 965 966 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 967 unsigned long state, void *ptr) 968 { 969 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 970 struct wireless_dev *wdev = dev->ieee80211_ptr; 971 struct cfg80211_registered_device *rdev; 972 struct cfg80211_sched_scan_request *sched_scan_req; 973 974 if (!wdev) 975 return NOTIFY_DONE; 976 977 rdev = wiphy_to_rdev(wdev->wiphy); 978 979 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 980 981 switch (state) { 982 case NETDEV_POST_INIT: 983 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 984 break; 985 case NETDEV_REGISTER: 986 /* 987 * NB: cannot take rdev->mtx here because this may be 988 * called within code protected by it when interfaces 989 * are added with nl80211. 990 */ 991 mutex_init(&wdev->mtx); 992 INIT_LIST_HEAD(&wdev->event_list); 993 spin_lock_init(&wdev->event_lock); 994 INIT_LIST_HEAD(&wdev->mgmt_registrations); 995 spin_lock_init(&wdev->mgmt_registrations_lock); 996 997 wdev->identifier = ++rdev->wdev_id; 998 list_add_rcu(&wdev->list, &rdev->wdev_list); 999 rdev->devlist_generation++; 1000 /* can only change netns with wiphy */ 1001 dev->features |= NETIF_F_NETNS_LOCAL; 1002 1003 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 1004 "phy80211")) { 1005 pr_err("failed to add phy80211 symlink to netdev!\n"); 1006 } 1007 wdev->netdev = dev; 1008 #ifdef CONFIG_CFG80211_WEXT 1009 wdev->wext.default_key = -1; 1010 wdev->wext.default_mgmt_key = -1; 1011 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1012 #endif 1013 1014 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1015 wdev->ps = true; 1016 else 1017 wdev->ps = false; 1018 /* allow mac80211 to determine the timeout */ 1019 wdev->ps_timeout = -1; 1020 1021 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1022 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1023 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1024 dev->priv_flags |= IFF_DONT_BRIDGE; 1025 break; 1026 case NETDEV_GOING_DOWN: 1027 cfg80211_leave(rdev, wdev); 1028 break; 1029 case NETDEV_DOWN: 1030 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1031 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1032 if (WARN_ON(!rdev->scan_req->notified)) 1033 rdev->scan_req->aborted = true; 1034 ___cfg80211_scan_done(rdev, false); 1035 } 1036 1037 sched_scan_req = rtnl_dereference(rdev->sched_scan_req); 1038 if (WARN_ON(sched_scan_req && 1039 sched_scan_req->dev == wdev->netdev)) { 1040 __cfg80211_stop_sched_scan(rdev, false); 1041 } 1042 1043 rdev->opencount--; 1044 wake_up(&rdev->dev_wait); 1045 break; 1046 case NETDEV_UP: 1047 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1048 wdev_lock(wdev); 1049 switch (wdev->iftype) { 1050 #ifdef CONFIG_CFG80211_WEXT 1051 case NL80211_IFTYPE_ADHOC: 1052 cfg80211_ibss_wext_join(rdev, wdev); 1053 break; 1054 case NL80211_IFTYPE_STATION: 1055 cfg80211_mgd_wext_connect(rdev, wdev); 1056 break; 1057 #endif 1058 #ifdef CONFIG_MAC80211_MESH 1059 case NL80211_IFTYPE_MESH_POINT: 1060 { 1061 /* backward compat code... */ 1062 struct mesh_setup setup; 1063 memcpy(&setup, &default_mesh_setup, 1064 sizeof(setup)); 1065 /* back compat only needed for mesh_id */ 1066 setup.mesh_id = wdev->ssid; 1067 setup.mesh_id_len = wdev->mesh_id_up_len; 1068 if (wdev->mesh_id_up_len) 1069 __cfg80211_join_mesh(rdev, dev, 1070 &setup, 1071 &default_mesh_config); 1072 break; 1073 } 1074 #endif 1075 default: 1076 break; 1077 } 1078 wdev_unlock(wdev); 1079 rdev->opencount++; 1080 1081 /* 1082 * Configure power management to the driver here so that its 1083 * correctly set also after interface type changes etc. 1084 */ 1085 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1086 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1087 rdev->ops->set_power_mgmt) 1088 if (rdev_set_power_mgmt(rdev, dev, wdev->ps, 1089 wdev->ps_timeout)) { 1090 /* assume this means it's off */ 1091 wdev->ps = false; 1092 } 1093 break; 1094 case NETDEV_UNREGISTER: 1095 /* 1096 * It is possible to get NETDEV_UNREGISTER 1097 * multiple times. To detect that, check 1098 * that the interface is still on the list 1099 * of registered interfaces, and only then 1100 * remove and clean it up. 1101 */ 1102 if (!list_empty(&wdev->list)) { 1103 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 1104 list_del_rcu(&wdev->list); 1105 rdev->devlist_generation++; 1106 cfg80211_mlme_purge_registrations(wdev); 1107 #ifdef CONFIG_CFG80211_WEXT 1108 kzfree(wdev->wext.keys); 1109 #endif 1110 } 1111 /* 1112 * synchronise (so that we won't find this netdev 1113 * from other code any more) and then clear the list 1114 * head so that the above code can safely check for 1115 * !list_empty() to avoid double-cleanup. 1116 */ 1117 synchronize_rcu(); 1118 INIT_LIST_HEAD(&wdev->list); 1119 /* 1120 * Ensure that all events have been processed and 1121 * freed. 1122 */ 1123 cfg80211_process_wdev_events(wdev); 1124 1125 if (WARN_ON(wdev->current_bss)) { 1126 cfg80211_unhold_bss(wdev->current_bss); 1127 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 1128 wdev->current_bss = NULL; 1129 } 1130 break; 1131 case NETDEV_PRE_UP: 1132 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 1133 return notifier_from_errno(-EOPNOTSUPP); 1134 if (rfkill_blocked(rdev->rfkill)) 1135 return notifier_from_errno(-ERFKILL); 1136 break; 1137 default: 1138 return NOTIFY_DONE; 1139 } 1140 1141 return NOTIFY_OK; 1142 } 1143 1144 static struct notifier_block cfg80211_netdev_notifier = { 1145 .notifier_call = cfg80211_netdev_notifier_call, 1146 }; 1147 1148 static void __net_exit cfg80211_pernet_exit(struct net *net) 1149 { 1150 struct cfg80211_registered_device *rdev; 1151 1152 rtnl_lock(); 1153 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1154 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1155 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1156 } 1157 rtnl_unlock(); 1158 } 1159 1160 static struct pernet_operations cfg80211_pernet_ops = { 1161 .exit = cfg80211_pernet_exit, 1162 }; 1163 1164 static int __init cfg80211_init(void) 1165 { 1166 int err; 1167 1168 err = register_pernet_device(&cfg80211_pernet_ops); 1169 if (err) 1170 goto out_fail_pernet; 1171 1172 err = wiphy_sysfs_init(); 1173 if (err) 1174 goto out_fail_sysfs; 1175 1176 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1177 if (err) 1178 goto out_fail_notifier; 1179 1180 err = nl80211_init(); 1181 if (err) 1182 goto out_fail_nl80211; 1183 1184 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1185 1186 err = regulatory_init(); 1187 if (err) 1188 goto out_fail_reg; 1189 1190 cfg80211_wq = create_singlethread_workqueue("cfg80211"); 1191 if (!cfg80211_wq) { 1192 err = -ENOMEM; 1193 goto out_fail_wq; 1194 } 1195 1196 return 0; 1197 1198 out_fail_wq: 1199 regulatory_exit(); 1200 out_fail_reg: 1201 debugfs_remove(ieee80211_debugfs_dir); 1202 nl80211_exit(); 1203 out_fail_nl80211: 1204 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1205 out_fail_notifier: 1206 wiphy_sysfs_exit(); 1207 out_fail_sysfs: 1208 unregister_pernet_device(&cfg80211_pernet_ops); 1209 out_fail_pernet: 1210 return err; 1211 } 1212 subsys_initcall(cfg80211_init); 1213 1214 static void __exit cfg80211_exit(void) 1215 { 1216 debugfs_remove(ieee80211_debugfs_dir); 1217 nl80211_exit(); 1218 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1219 wiphy_sysfs_exit(); 1220 regulatory_exit(); 1221 unregister_pernet_device(&cfg80211_pernet_ops); 1222 destroy_workqueue(cfg80211_wq); 1223 } 1224 module_exit(cfg80211_exit); 1225