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 * Copyright 2015 Intel Deutschland GmbH 7 */ 8 9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 10 11 #include <linux/if.h> 12 #include <linux/module.h> 13 #include <linux/err.h> 14 #include <linux/list.h> 15 #include <linux/slab.h> 16 #include <linux/nl80211.h> 17 #include <linux/debugfs.h> 18 #include <linux/notifier.h> 19 #include <linux/device.h> 20 #include <linux/etherdevice.h> 21 #include <linux/rtnetlink.h> 22 #include <linux/sched.h> 23 #include <net/genetlink.h> 24 #include <net/cfg80211.h> 25 #include "nl80211.h" 26 #include "core.h" 27 #include "sysfs.h" 28 #include "debugfs.h" 29 #include "wext-compat.h" 30 #include "rdev-ops.h" 31 32 /* name for sysfs, %d is appended */ 33 #define PHY_NAME "phy" 34 35 MODULE_AUTHOR("Johannes Berg"); 36 MODULE_LICENSE("GPL"); 37 MODULE_DESCRIPTION("wireless configuration support"); 38 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME); 39 40 /* RCU-protected (and RTNL for writers) */ 41 LIST_HEAD(cfg80211_rdev_list); 42 int cfg80211_rdev_list_generation; 43 44 /* for debugfs */ 45 static struct dentry *ieee80211_debugfs_dir; 46 47 /* for the cleanup, scan and event works */ 48 struct workqueue_struct *cfg80211_wq; 49 50 static bool cfg80211_disable_40mhz_24ghz; 51 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644); 52 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz, 53 "Disable 40MHz support in the 2.4GHz band"); 54 55 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx) 56 { 57 struct cfg80211_registered_device *result = NULL, *rdev; 58 59 ASSERT_RTNL(); 60 61 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 62 if (rdev->wiphy_idx == wiphy_idx) { 63 result = rdev; 64 break; 65 } 66 } 67 68 return result; 69 } 70 71 int get_wiphy_idx(struct wiphy *wiphy) 72 { 73 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 74 75 return rdev->wiphy_idx; 76 } 77 78 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx) 79 { 80 struct cfg80211_registered_device *rdev; 81 82 ASSERT_RTNL(); 83 84 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx); 85 if (!rdev) 86 return NULL; 87 return &rdev->wiphy; 88 } 89 90 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev, 91 const char *newname) 92 { 93 struct cfg80211_registered_device *rdev2; 94 int wiphy_idx, taken = -1, digits; 95 96 ASSERT_RTNL(); 97 98 /* prohibit calling the thing phy%d when %d is not its number */ 99 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken); 100 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) { 101 /* count number of places needed to print wiphy_idx */ 102 digits = 1; 103 while (wiphy_idx /= 10) 104 digits++; 105 /* 106 * deny the name if it is phy<idx> where <idx> is printed 107 * without leading zeroes. taken == strlen(newname) here 108 */ 109 if (taken == strlen(PHY_NAME) + digits) 110 return -EINVAL; 111 } 112 113 /* Ensure another device does not already have this name. */ 114 list_for_each_entry(rdev2, &cfg80211_rdev_list, list) 115 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0) 116 return -EINVAL; 117 118 return 0; 119 } 120 121 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, 122 char *newname) 123 { 124 int result; 125 126 ASSERT_RTNL(); 127 128 /* Ignore nop renames */ 129 if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0) 130 return 0; 131 132 result = cfg80211_dev_check_name(rdev, newname); 133 if (result < 0) 134 return result; 135 136 result = device_rename(&rdev->wiphy.dev, newname); 137 if (result) 138 return result; 139 140 if (rdev->wiphy.debugfsdir && 141 !debugfs_rename(rdev->wiphy.debugfsdir->d_parent, 142 rdev->wiphy.debugfsdir, 143 rdev->wiphy.debugfsdir->d_parent, 144 newname)) 145 pr_err("failed to rename debugfs dir to %s!\n", newname); 146 147 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 148 149 return 0; 150 } 151 152 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, 153 struct net *net) 154 { 155 struct wireless_dev *wdev; 156 int err = 0; 157 158 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK)) 159 return -EOPNOTSUPP; 160 161 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 162 if (!wdev->netdev) 163 continue; 164 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 165 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); 166 if (err) 167 break; 168 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 169 } 170 171 if (err) { 172 /* failed -- clean up to old netns */ 173 net = wiphy_net(&rdev->wiphy); 174 175 list_for_each_entry_continue_reverse(wdev, 176 &rdev->wiphy.wdev_list, 177 list) { 178 if (!wdev->netdev) 179 continue; 180 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 181 err = dev_change_net_namespace(wdev->netdev, net, 182 "wlan%d"); 183 WARN_ON(err); 184 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 185 } 186 187 return err; 188 } 189 190 wiphy_net_set(&rdev->wiphy, net); 191 192 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev)); 193 WARN_ON(err); 194 195 return 0; 196 } 197 198 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data) 199 { 200 struct cfg80211_registered_device *rdev = data; 201 202 rdev_rfkill_poll(rdev); 203 } 204 205 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev, 206 struct wireless_dev *wdev) 207 { 208 ASSERT_RTNL(); 209 210 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE)) 211 return; 212 213 if (!wdev->p2p_started) 214 return; 215 216 rdev_stop_p2p_device(rdev, wdev); 217 wdev->p2p_started = false; 218 219 rdev->opencount--; 220 221 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 222 if (WARN_ON(!rdev->scan_req->notified)) 223 rdev->scan_req->aborted = true; 224 ___cfg80211_scan_done(rdev, false); 225 } 226 } 227 228 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy) 229 { 230 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 231 struct wireless_dev *wdev; 232 233 ASSERT_RTNL(); 234 235 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 236 if (wdev->netdev) { 237 dev_close(wdev->netdev); 238 continue; 239 } 240 /* otherwise, check iftype */ 241 switch (wdev->iftype) { 242 case NL80211_IFTYPE_P2P_DEVICE: 243 cfg80211_stop_p2p_device(rdev, wdev); 244 break; 245 default: 246 break; 247 } 248 } 249 } 250 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces); 251 252 static int cfg80211_rfkill_set_block(void *data, bool blocked) 253 { 254 struct cfg80211_registered_device *rdev = data; 255 256 if (!blocked) 257 return 0; 258 259 rtnl_lock(); 260 cfg80211_shutdown_all_interfaces(&rdev->wiphy); 261 rtnl_unlock(); 262 263 return 0; 264 } 265 266 static void cfg80211_rfkill_sync_work(struct work_struct *work) 267 { 268 struct cfg80211_registered_device *rdev; 269 270 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync); 271 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill)); 272 } 273 274 static void cfg80211_event_work(struct work_struct *work) 275 { 276 struct cfg80211_registered_device *rdev; 277 278 rdev = container_of(work, struct cfg80211_registered_device, 279 event_work); 280 281 rtnl_lock(); 282 cfg80211_process_rdev_events(rdev); 283 rtnl_unlock(); 284 } 285 286 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev) 287 { 288 struct cfg80211_iface_destroy *item; 289 290 ASSERT_RTNL(); 291 292 spin_lock_irq(&rdev->destroy_list_lock); 293 while ((item = list_first_entry_or_null(&rdev->destroy_list, 294 struct cfg80211_iface_destroy, 295 list))) { 296 struct wireless_dev *wdev, *tmp; 297 u32 nlportid = item->nlportid; 298 299 list_del(&item->list); 300 kfree(item); 301 spin_unlock_irq(&rdev->destroy_list_lock); 302 303 list_for_each_entry_safe(wdev, tmp, 304 &rdev->wiphy.wdev_list, list) { 305 if (nlportid == wdev->owner_nlportid) 306 rdev_del_virtual_intf(rdev, wdev); 307 } 308 309 spin_lock_irq(&rdev->destroy_list_lock); 310 } 311 spin_unlock_irq(&rdev->destroy_list_lock); 312 } 313 314 static void cfg80211_destroy_iface_wk(struct work_struct *work) 315 { 316 struct cfg80211_registered_device *rdev; 317 318 rdev = container_of(work, struct cfg80211_registered_device, 319 destroy_work); 320 321 rtnl_lock(); 322 cfg80211_destroy_ifaces(rdev); 323 rtnl_unlock(); 324 } 325 326 static void cfg80211_sched_scan_stop_wk(struct work_struct *work) 327 { 328 struct cfg80211_registered_device *rdev; 329 330 rdev = container_of(work, struct cfg80211_registered_device, 331 sched_scan_stop_wk); 332 333 rtnl_lock(); 334 335 __cfg80211_stop_sched_scan(rdev, false); 336 337 rtnl_unlock(); 338 } 339 340 /* exported functions */ 341 342 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, 343 const char *requested_name) 344 { 345 static atomic_t wiphy_counter = ATOMIC_INIT(0); 346 347 struct cfg80211_registered_device *rdev; 348 int alloc_size; 349 350 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 351 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 352 WARN_ON(ops->connect && !ops->disconnect); 353 WARN_ON(ops->join_ibss && !ops->leave_ibss); 354 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 355 WARN_ON(ops->add_station && !ops->del_station); 356 WARN_ON(ops->add_mpath && !ops->del_mpath); 357 WARN_ON(ops->join_mesh && !ops->leave_mesh); 358 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device); 359 WARN_ON(ops->start_ap && !ops->stop_ap); 360 WARN_ON(ops->join_ocb && !ops->leave_ocb); 361 WARN_ON(ops->suspend && !ops->resume); 362 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop); 363 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel); 364 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch); 365 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts); 366 WARN_ON(ops->set_tx_power && !ops->get_tx_power); 367 WARN_ON(ops->set_antenna && !ops->get_antenna); 368 369 alloc_size = sizeof(*rdev) + sizeof_priv; 370 371 rdev = kzalloc(alloc_size, GFP_KERNEL); 372 if (!rdev) 373 return NULL; 374 375 rdev->ops = ops; 376 377 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 378 379 if (unlikely(rdev->wiphy_idx < 0)) { 380 /* ugh, wrapped! */ 381 atomic_dec(&wiphy_counter); 382 kfree(rdev); 383 return NULL; 384 } 385 386 /* atomic_inc_return makes it start at 1, make it start at 0 */ 387 rdev->wiphy_idx--; 388 389 /* give it a proper name */ 390 if (requested_name && requested_name[0]) { 391 int rv; 392 393 rtnl_lock(); 394 rv = cfg80211_dev_check_name(rdev, requested_name); 395 396 if (rv < 0) { 397 rtnl_unlock(); 398 goto use_default_name; 399 } 400 401 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); 402 rtnl_unlock(); 403 if (rv) 404 goto use_default_name; 405 } else { 406 use_default_name: 407 /* NOTE: This is *probably* safe w/out holding rtnl because of 408 * the restrictions on phy names. Probably this call could 409 * fail if some other part of the kernel (re)named a device 410 * phyX. But, might should add some locking and check return 411 * value, and use a different name if this one exists? 412 */ 413 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 414 } 415 416 INIT_LIST_HEAD(&rdev->wiphy.wdev_list); 417 INIT_LIST_HEAD(&rdev->beacon_registrations); 418 spin_lock_init(&rdev->beacon_registrations_lock); 419 spin_lock_init(&rdev->bss_lock); 420 INIT_LIST_HEAD(&rdev->bss_list); 421 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 422 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results); 423 INIT_LIST_HEAD(&rdev->mlme_unreg); 424 spin_lock_init(&rdev->mlme_unreg_lock); 425 INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk); 426 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 427 cfg80211_dfs_channels_update_work); 428 #ifdef CONFIG_CFG80211_WEXT 429 rdev->wiphy.wext = &cfg80211_wext_handler; 430 #endif 431 432 device_initialize(&rdev->wiphy.dev); 433 rdev->wiphy.dev.class = &ieee80211_class; 434 rdev->wiphy.dev.platform_data = rdev; 435 device_enable_async_suspend(&rdev->wiphy.dev); 436 437 INIT_LIST_HEAD(&rdev->destroy_list); 438 spin_lock_init(&rdev->destroy_list_lock); 439 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 440 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 441 442 #ifdef CONFIG_CFG80211_DEFAULT_PS 443 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 444 #endif 445 446 wiphy_net_set(&rdev->wiphy, &init_net); 447 448 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 449 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 450 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 451 &rdev->rfkill_ops, rdev); 452 453 if (!rdev->rfkill) { 454 kfree(rdev); 455 return NULL; 456 } 457 458 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); 459 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 460 INIT_WORK(&rdev->event_work, cfg80211_event_work); 461 462 init_waitqueue_head(&rdev->dev_wait); 463 464 /* 465 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 466 * Fragmentation and RTS threshold are disabled by default with the 467 * special -1 value. 468 */ 469 rdev->wiphy.retry_short = 7; 470 rdev->wiphy.retry_long = 4; 471 rdev->wiphy.frag_threshold = (u32) -1; 472 rdev->wiphy.rts_threshold = (u32) -1; 473 rdev->wiphy.coverage_class = 0; 474 475 rdev->wiphy.max_num_csa_counters = 1; 476 477 rdev->wiphy.max_sched_scan_plans = 1; 478 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 479 480 return &rdev->wiphy; 481 } 482 EXPORT_SYMBOL(wiphy_new_nm); 483 484 static int wiphy_verify_combinations(struct wiphy *wiphy) 485 { 486 const struct ieee80211_iface_combination *c; 487 int i, j; 488 489 for (i = 0; i < wiphy->n_iface_combinations; i++) { 490 u32 cnt = 0; 491 u16 all_iftypes = 0; 492 493 c = &wiphy->iface_combinations[i]; 494 495 /* 496 * Combinations with just one interface aren't real, 497 * however we make an exception for DFS. 498 */ 499 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 500 return -EINVAL; 501 502 /* Need at least one channel */ 503 if (WARN_ON(!c->num_different_channels)) 504 return -EINVAL; 505 506 /* 507 * Put a sane limit on maximum number of different 508 * channels to simplify channel accounting code. 509 */ 510 if (WARN_ON(c->num_different_channels > 511 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 512 return -EINVAL; 513 514 /* DFS only works on one channel. */ 515 if (WARN_ON(c->radar_detect_widths && 516 (c->num_different_channels > 1))) 517 return -EINVAL; 518 519 if (WARN_ON(!c->n_limits)) 520 return -EINVAL; 521 522 for (j = 0; j < c->n_limits; j++) { 523 u16 types = c->limits[j].types; 524 525 /* interface types shouldn't overlap */ 526 if (WARN_ON(types & all_iftypes)) 527 return -EINVAL; 528 all_iftypes |= types; 529 530 if (WARN_ON(!c->limits[j].max)) 531 return -EINVAL; 532 533 /* Shouldn't list software iftypes in combinations! */ 534 if (WARN_ON(wiphy->software_iftypes & types)) 535 return -EINVAL; 536 537 /* Only a single P2P_DEVICE can be allowed */ 538 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 539 c->limits[j].max > 1)) 540 return -EINVAL; 541 542 cnt += c->limits[j].max; 543 /* 544 * Don't advertise an unsupported type 545 * in a combination. 546 */ 547 if (WARN_ON((wiphy->interface_modes & types) != types)) 548 return -EINVAL; 549 } 550 551 /* You can't even choose that many! */ 552 if (WARN_ON(cnt < c->max_interfaces)) 553 return -EINVAL; 554 } 555 556 return 0; 557 } 558 559 int wiphy_register(struct wiphy *wiphy) 560 { 561 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 562 int res; 563 enum nl80211_band band; 564 struct ieee80211_supported_band *sband; 565 bool have_band = false; 566 int i; 567 u16 ifmodes = wiphy->interface_modes; 568 569 #ifdef CONFIG_PM 570 if (WARN_ON(wiphy->wowlan && 571 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 572 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 573 return -EINVAL; 574 if (WARN_ON(wiphy->wowlan && 575 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 576 !wiphy->wowlan->tcp)) 577 return -EINVAL; 578 #endif 579 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 580 (!rdev->ops->tdls_channel_switch || 581 !rdev->ops->tdls_cancel_channel_switch))) 582 return -EINVAL; 583 584 /* 585 * if a wiphy has unsupported modes for regulatory channel enforcement, 586 * opt-out of enforcement checking 587 */ 588 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) | 589 BIT(NL80211_IFTYPE_P2P_CLIENT) | 590 BIT(NL80211_IFTYPE_AP) | 591 BIT(NL80211_IFTYPE_P2P_GO) | 592 BIT(NL80211_IFTYPE_ADHOC) | 593 BIT(NL80211_IFTYPE_P2P_DEVICE) | 594 BIT(NL80211_IFTYPE_AP_VLAN) | 595 BIT(NL80211_IFTYPE_MONITOR))) 596 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF; 597 598 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 599 (wiphy->regulatory_flags & 600 (REGULATORY_CUSTOM_REG | 601 REGULATORY_STRICT_REG | 602 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 603 REGULATORY_COUNTRY_IE_IGNORE)))) 604 return -EINVAL; 605 606 if (WARN_ON(wiphy->coalesce && 607 (!wiphy->coalesce->n_rules || 608 !wiphy->coalesce->n_patterns) && 609 (!wiphy->coalesce->pattern_min_len || 610 wiphy->coalesce->pattern_min_len > 611 wiphy->coalesce->pattern_max_len))) 612 return -EINVAL; 613 614 if (WARN_ON(wiphy->ap_sme_capa && 615 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 616 return -EINVAL; 617 618 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 619 return -EINVAL; 620 621 if (WARN_ON(wiphy->addresses && 622 !is_zero_ether_addr(wiphy->perm_addr) && 623 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 624 ETH_ALEN))) 625 return -EINVAL; 626 627 if (WARN_ON(wiphy->max_acl_mac_addrs && 628 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 629 !rdev->ops->set_mac_acl))) 630 return -EINVAL; 631 632 /* assure only valid behaviours are flagged by driver 633 * hence subtract 2 as bit 0 is invalid. 634 */ 635 if (WARN_ON(wiphy->bss_select_support && 636 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 637 return -EINVAL; 638 639 if (wiphy->addresses) 640 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 641 642 /* sanity check ifmodes */ 643 WARN_ON(!ifmodes); 644 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 645 if (WARN_ON(ifmodes != wiphy->interface_modes)) 646 wiphy->interface_modes = ifmodes; 647 648 res = wiphy_verify_combinations(wiphy); 649 if (res) 650 return res; 651 652 /* sanity check supported bands/channels */ 653 for (band = 0; band < NUM_NL80211_BANDS; band++) { 654 sband = wiphy->bands[band]; 655 if (!sband) 656 continue; 657 658 sband->band = band; 659 if (WARN_ON(!sband->n_channels)) 660 return -EINVAL; 661 /* 662 * on 60GHz band, there are no legacy rates, so 663 * n_bitrates is 0 664 */ 665 if (WARN_ON(band != NL80211_BAND_60GHZ && 666 !sband->n_bitrates)) 667 return -EINVAL; 668 669 /* 670 * Since cfg80211_disable_40mhz_24ghz is global, we can 671 * modify the sband's ht data even if the driver uses a 672 * global structure for that. 673 */ 674 if (cfg80211_disable_40mhz_24ghz && 675 band == NL80211_BAND_2GHZ && 676 sband->ht_cap.ht_supported) { 677 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 678 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 679 } 680 681 /* 682 * Since we use a u32 for rate bitmaps in 683 * ieee80211_get_response_rate, we cannot 684 * have more than 32 legacy rates. 685 */ 686 if (WARN_ON(sband->n_bitrates > 32)) 687 return -EINVAL; 688 689 for (i = 0; i < sband->n_channels; i++) { 690 sband->channels[i].orig_flags = 691 sband->channels[i].flags; 692 sband->channels[i].orig_mag = INT_MAX; 693 sband->channels[i].orig_mpwr = 694 sband->channels[i].max_power; 695 sband->channels[i].band = band; 696 } 697 698 have_band = true; 699 } 700 701 if (!have_band) { 702 WARN_ON(1); 703 return -EINVAL; 704 } 705 706 #ifdef CONFIG_PM 707 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 708 (!rdev->wiphy.wowlan->pattern_min_len || 709 rdev->wiphy.wowlan->pattern_min_len > 710 rdev->wiphy.wowlan->pattern_max_len))) 711 return -EINVAL; 712 #endif 713 714 /* check and set up bitrates */ 715 ieee80211_set_bitrate_flags(wiphy); 716 717 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 718 719 rtnl_lock(); 720 res = device_add(&rdev->wiphy.dev); 721 if (res) { 722 rtnl_unlock(); 723 return res; 724 } 725 726 /* set up regulatory info */ 727 wiphy_regulatory_register(wiphy); 728 729 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 730 cfg80211_rdev_list_generation++; 731 732 /* add to debugfs */ 733 rdev->wiphy.debugfsdir = 734 debugfs_create_dir(wiphy_name(&rdev->wiphy), 735 ieee80211_debugfs_dir); 736 if (IS_ERR(rdev->wiphy.debugfsdir)) 737 rdev->wiphy.debugfsdir = NULL; 738 739 cfg80211_debugfs_rdev_add(rdev); 740 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 741 742 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 743 struct regulatory_request request; 744 745 request.wiphy_idx = get_wiphy_idx(wiphy); 746 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 747 request.alpha2[0] = '9'; 748 request.alpha2[1] = '9'; 749 750 nl80211_send_reg_change_event(&request); 751 } 752 753 rdev->wiphy.registered = true; 754 rtnl_unlock(); 755 756 res = rfkill_register(rdev->rfkill); 757 if (res) { 758 rfkill_destroy(rdev->rfkill); 759 rdev->rfkill = NULL; 760 wiphy_unregister(&rdev->wiphy); 761 return res; 762 } 763 764 return 0; 765 } 766 EXPORT_SYMBOL(wiphy_register); 767 768 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 769 { 770 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 771 772 if (!rdev->ops->rfkill_poll) 773 return; 774 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 775 rfkill_resume_polling(rdev->rfkill); 776 } 777 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 778 779 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 780 { 781 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 782 783 rfkill_pause_polling(rdev->rfkill); 784 } 785 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 786 787 void wiphy_unregister(struct wiphy *wiphy) 788 { 789 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 790 791 wait_event(rdev->dev_wait, ({ 792 int __count; 793 rtnl_lock(); 794 __count = rdev->opencount; 795 rtnl_unlock(); 796 __count == 0; })); 797 798 if (rdev->rfkill) 799 rfkill_unregister(rdev->rfkill); 800 801 rtnl_lock(); 802 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 803 rdev->wiphy.registered = false; 804 805 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 806 807 /* 808 * First remove the hardware from everywhere, this makes 809 * it impossible to find from userspace. 810 */ 811 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 812 list_del_rcu(&rdev->list); 813 synchronize_rcu(); 814 815 /* 816 * If this device got a regulatory hint tell core its 817 * free to listen now to a new shiny device regulatory hint 818 */ 819 wiphy_regulatory_deregister(wiphy); 820 821 cfg80211_rdev_list_generation++; 822 device_del(&rdev->wiphy.dev); 823 824 rtnl_unlock(); 825 826 flush_work(&rdev->scan_done_wk); 827 cancel_work_sync(&rdev->conn_work); 828 flush_work(&rdev->event_work); 829 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 830 flush_work(&rdev->destroy_work); 831 flush_work(&rdev->sched_scan_stop_wk); 832 flush_work(&rdev->mlme_unreg_wk); 833 834 #ifdef CONFIG_PM 835 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 836 rdev_set_wakeup(rdev, false); 837 #endif 838 cfg80211_rdev_free_wowlan(rdev); 839 cfg80211_rdev_free_coalesce(rdev); 840 } 841 EXPORT_SYMBOL(wiphy_unregister); 842 843 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 844 { 845 struct cfg80211_internal_bss *scan, *tmp; 846 struct cfg80211_beacon_registration *reg, *treg; 847 rfkill_destroy(rdev->rfkill); 848 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 849 list_del(®->list); 850 kfree(reg); 851 } 852 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 853 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 854 kfree(rdev); 855 } 856 857 void wiphy_free(struct wiphy *wiphy) 858 { 859 put_device(&wiphy->dev); 860 } 861 EXPORT_SYMBOL(wiphy_free); 862 863 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 864 { 865 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 866 867 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 868 schedule_work(&rdev->rfkill_sync); 869 } 870 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 871 872 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 873 { 874 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 875 876 ASSERT_RTNL(); 877 878 if (WARN_ON(wdev->netdev)) 879 return; 880 881 list_del_rcu(&wdev->list); 882 rdev->devlist_generation++; 883 884 switch (wdev->iftype) { 885 case NL80211_IFTYPE_P2P_DEVICE: 886 cfg80211_mlme_purge_registrations(wdev); 887 cfg80211_stop_p2p_device(rdev, wdev); 888 break; 889 default: 890 WARN_ON_ONCE(1); 891 break; 892 } 893 } 894 EXPORT_SYMBOL(cfg80211_unregister_wdev); 895 896 static const struct device_type wiphy_type = { 897 .name = "wlan", 898 }; 899 900 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 901 enum nl80211_iftype iftype, int num) 902 { 903 ASSERT_RTNL(); 904 905 rdev->num_running_ifaces += num; 906 if (iftype == NL80211_IFTYPE_MONITOR) 907 rdev->num_running_monitor_ifaces += num; 908 } 909 910 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 911 struct wireless_dev *wdev) 912 { 913 struct net_device *dev = wdev->netdev; 914 struct cfg80211_sched_scan_request *sched_scan_req; 915 916 ASSERT_RTNL(); 917 ASSERT_WDEV_LOCK(wdev); 918 919 switch (wdev->iftype) { 920 case NL80211_IFTYPE_ADHOC: 921 __cfg80211_leave_ibss(rdev, dev, true); 922 break; 923 case NL80211_IFTYPE_P2P_CLIENT: 924 case NL80211_IFTYPE_STATION: 925 sched_scan_req = rtnl_dereference(rdev->sched_scan_req); 926 if (sched_scan_req && dev == sched_scan_req->dev) 927 __cfg80211_stop_sched_scan(rdev, false); 928 929 #ifdef CONFIG_CFG80211_WEXT 930 kfree(wdev->wext.ie); 931 wdev->wext.ie = NULL; 932 wdev->wext.ie_len = 0; 933 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 934 #endif 935 cfg80211_disconnect(rdev, dev, 936 WLAN_REASON_DEAUTH_LEAVING, true); 937 break; 938 case NL80211_IFTYPE_MESH_POINT: 939 __cfg80211_leave_mesh(rdev, dev); 940 break; 941 case NL80211_IFTYPE_AP: 942 case NL80211_IFTYPE_P2P_GO: 943 __cfg80211_stop_ap(rdev, dev, true); 944 break; 945 case NL80211_IFTYPE_OCB: 946 __cfg80211_leave_ocb(rdev, dev); 947 break; 948 case NL80211_IFTYPE_WDS: 949 /* must be handled by mac80211/driver, has no APIs */ 950 break; 951 case NL80211_IFTYPE_P2P_DEVICE: 952 /* cannot happen, has no netdev */ 953 break; 954 case NL80211_IFTYPE_AP_VLAN: 955 case NL80211_IFTYPE_MONITOR: 956 /* nothing to do */ 957 break; 958 case NL80211_IFTYPE_UNSPECIFIED: 959 case NUM_NL80211_IFTYPES: 960 /* invalid */ 961 break; 962 } 963 } 964 965 void cfg80211_leave(struct cfg80211_registered_device *rdev, 966 struct wireless_dev *wdev) 967 { 968 wdev_lock(wdev); 969 __cfg80211_leave(rdev, wdev); 970 wdev_unlock(wdev); 971 } 972 973 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 974 gfp_t gfp) 975 { 976 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 977 struct cfg80211_event *ev; 978 unsigned long flags; 979 980 trace_cfg80211_stop_iface(wiphy, wdev); 981 982 ev = kzalloc(sizeof(*ev), gfp); 983 if (!ev) 984 return; 985 986 ev->type = EVENT_STOPPED; 987 988 spin_lock_irqsave(&wdev->event_lock, flags); 989 list_add_tail(&ev->list, &wdev->event_list); 990 spin_unlock_irqrestore(&wdev->event_lock, flags); 991 queue_work(cfg80211_wq, &rdev->event_work); 992 } 993 EXPORT_SYMBOL(cfg80211_stop_iface); 994 995 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 996 unsigned long state, void *ptr) 997 { 998 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 999 struct wireless_dev *wdev = dev->ieee80211_ptr; 1000 struct cfg80211_registered_device *rdev; 1001 struct cfg80211_sched_scan_request *sched_scan_req; 1002 1003 if (!wdev) 1004 return NOTIFY_DONE; 1005 1006 rdev = wiphy_to_rdev(wdev->wiphy); 1007 1008 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 1009 1010 switch (state) { 1011 case NETDEV_POST_INIT: 1012 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 1013 break; 1014 case NETDEV_REGISTER: 1015 /* 1016 * NB: cannot take rdev->mtx here because this may be 1017 * called within code protected by it when interfaces 1018 * are added with nl80211. 1019 */ 1020 mutex_init(&wdev->mtx); 1021 INIT_LIST_HEAD(&wdev->event_list); 1022 spin_lock_init(&wdev->event_lock); 1023 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1024 spin_lock_init(&wdev->mgmt_registrations_lock); 1025 1026 wdev->identifier = ++rdev->wdev_id; 1027 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list); 1028 rdev->devlist_generation++; 1029 /* can only change netns with wiphy */ 1030 dev->features |= NETIF_F_NETNS_LOCAL; 1031 1032 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 1033 "phy80211")) { 1034 pr_err("failed to add phy80211 symlink to netdev!\n"); 1035 } 1036 wdev->netdev = dev; 1037 #ifdef CONFIG_CFG80211_WEXT 1038 wdev->wext.default_key = -1; 1039 wdev->wext.default_mgmt_key = -1; 1040 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1041 #endif 1042 1043 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1044 wdev->ps = true; 1045 else 1046 wdev->ps = false; 1047 /* allow mac80211 to determine the timeout */ 1048 wdev->ps_timeout = -1; 1049 1050 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1051 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1052 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1053 dev->priv_flags |= IFF_DONT_BRIDGE; 1054 break; 1055 case NETDEV_GOING_DOWN: 1056 cfg80211_leave(rdev, wdev); 1057 break; 1058 case NETDEV_DOWN: 1059 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1060 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1061 if (WARN_ON(!rdev->scan_req->notified)) 1062 rdev->scan_req->aborted = true; 1063 ___cfg80211_scan_done(rdev, false); 1064 } 1065 1066 sched_scan_req = rtnl_dereference(rdev->sched_scan_req); 1067 if (WARN_ON(sched_scan_req && 1068 sched_scan_req->dev == wdev->netdev)) { 1069 __cfg80211_stop_sched_scan(rdev, false); 1070 } 1071 1072 rdev->opencount--; 1073 wake_up(&rdev->dev_wait); 1074 break; 1075 case NETDEV_UP: 1076 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1077 wdev_lock(wdev); 1078 switch (wdev->iftype) { 1079 #ifdef CONFIG_CFG80211_WEXT 1080 case NL80211_IFTYPE_ADHOC: 1081 cfg80211_ibss_wext_join(rdev, wdev); 1082 break; 1083 case NL80211_IFTYPE_STATION: 1084 cfg80211_mgd_wext_connect(rdev, wdev); 1085 break; 1086 #endif 1087 #ifdef CONFIG_MAC80211_MESH 1088 case NL80211_IFTYPE_MESH_POINT: 1089 { 1090 /* backward compat code... */ 1091 struct mesh_setup setup; 1092 memcpy(&setup, &default_mesh_setup, 1093 sizeof(setup)); 1094 /* back compat only needed for mesh_id */ 1095 setup.mesh_id = wdev->ssid; 1096 setup.mesh_id_len = wdev->mesh_id_up_len; 1097 if (wdev->mesh_id_up_len) 1098 __cfg80211_join_mesh(rdev, dev, 1099 &setup, 1100 &default_mesh_config); 1101 break; 1102 } 1103 #endif 1104 default: 1105 break; 1106 } 1107 wdev_unlock(wdev); 1108 rdev->opencount++; 1109 1110 /* 1111 * Configure power management to the driver here so that its 1112 * correctly set also after interface type changes etc. 1113 */ 1114 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1115 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1116 rdev->ops->set_power_mgmt) 1117 if (rdev_set_power_mgmt(rdev, dev, wdev->ps, 1118 wdev->ps_timeout)) { 1119 /* assume this means it's off */ 1120 wdev->ps = false; 1121 } 1122 break; 1123 case NETDEV_UNREGISTER: 1124 /* 1125 * It is possible to get NETDEV_UNREGISTER 1126 * multiple times. To detect that, check 1127 * that the interface is still on the list 1128 * of registered interfaces, and only then 1129 * remove and clean it up. 1130 */ 1131 if (!list_empty(&wdev->list)) { 1132 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 1133 list_del_rcu(&wdev->list); 1134 rdev->devlist_generation++; 1135 cfg80211_mlme_purge_registrations(wdev); 1136 #ifdef CONFIG_CFG80211_WEXT 1137 kzfree(wdev->wext.keys); 1138 #endif 1139 } 1140 /* 1141 * synchronise (so that we won't find this netdev 1142 * from other code any more) and then clear the list 1143 * head so that the above code can safely check for 1144 * !list_empty() to avoid double-cleanup. 1145 */ 1146 synchronize_rcu(); 1147 INIT_LIST_HEAD(&wdev->list); 1148 /* 1149 * Ensure that all events have been processed and 1150 * freed. 1151 */ 1152 cfg80211_process_wdev_events(wdev); 1153 1154 if (WARN_ON(wdev->current_bss)) { 1155 cfg80211_unhold_bss(wdev->current_bss); 1156 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 1157 wdev->current_bss = NULL; 1158 } 1159 break; 1160 case NETDEV_PRE_UP: 1161 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 1162 return notifier_from_errno(-EOPNOTSUPP); 1163 if (rfkill_blocked(rdev->rfkill)) 1164 return notifier_from_errno(-ERFKILL); 1165 break; 1166 default: 1167 return NOTIFY_DONE; 1168 } 1169 1170 wireless_nlevent_flush(); 1171 1172 return NOTIFY_OK; 1173 } 1174 1175 static struct notifier_block cfg80211_netdev_notifier = { 1176 .notifier_call = cfg80211_netdev_notifier_call, 1177 }; 1178 1179 static void __net_exit cfg80211_pernet_exit(struct net *net) 1180 { 1181 struct cfg80211_registered_device *rdev; 1182 1183 rtnl_lock(); 1184 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1185 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1186 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1187 } 1188 rtnl_unlock(); 1189 } 1190 1191 static struct pernet_operations cfg80211_pernet_ops = { 1192 .exit = cfg80211_pernet_exit, 1193 }; 1194 1195 static int __init cfg80211_init(void) 1196 { 1197 int err; 1198 1199 err = register_pernet_device(&cfg80211_pernet_ops); 1200 if (err) 1201 goto out_fail_pernet; 1202 1203 err = wiphy_sysfs_init(); 1204 if (err) 1205 goto out_fail_sysfs; 1206 1207 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1208 if (err) 1209 goto out_fail_notifier; 1210 1211 err = nl80211_init(); 1212 if (err) 1213 goto out_fail_nl80211; 1214 1215 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1216 1217 err = regulatory_init(); 1218 if (err) 1219 goto out_fail_reg; 1220 1221 cfg80211_wq = create_singlethread_workqueue("cfg80211"); 1222 if (!cfg80211_wq) { 1223 err = -ENOMEM; 1224 goto out_fail_wq; 1225 } 1226 1227 return 0; 1228 1229 out_fail_wq: 1230 regulatory_exit(); 1231 out_fail_reg: 1232 debugfs_remove(ieee80211_debugfs_dir); 1233 nl80211_exit(); 1234 out_fail_nl80211: 1235 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1236 out_fail_notifier: 1237 wiphy_sysfs_exit(); 1238 out_fail_sysfs: 1239 unregister_pernet_device(&cfg80211_pernet_ops); 1240 out_fail_pernet: 1241 return err; 1242 } 1243 subsys_initcall(cfg80211_init); 1244 1245 static void __exit cfg80211_exit(void) 1246 { 1247 debugfs_remove(ieee80211_debugfs_dir); 1248 nl80211_exit(); 1249 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1250 wiphy_sysfs_exit(); 1251 regulatory_exit(); 1252 unregister_pernet_device(&cfg80211_pernet_ops); 1253 destroy_workqueue(cfg80211_wq); 1254 } 1255 module_exit(cfg80211_exit); 1256