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 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device); 356 WARN_ON(ops->start_ap && !ops->stop_ap); 357 WARN_ON(ops->join_ocb && !ops->leave_ocb); 358 WARN_ON(ops->suspend && !ops->resume); 359 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop); 360 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel); 361 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch); 362 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts); 363 WARN_ON(ops->set_tx_power && !ops->get_tx_power); 364 WARN_ON(ops->set_antenna && !ops->get_antenna); 365 366 alloc_size = sizeof(*rdev) + sizeof_priv; 367 368 rdev = kzalloc(alloc_size, GFP_KERNEL); 369 if (!rdev) 370 return NULL; 371 372 rdev->ops = ops; 373 374 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 375 376 if (unlikely(rdev->wiphy_idx < 0)) { 377 /* ugh, wrapped! */ 378 atomic_dec(&wiphy_counter); 379 kfree(rdev); 380 return NULL; 381 } 382 383 /* atomic_inc_return makes it start at 1, make it start at 0 */ 384 rdev->wiphy_idx--; 385 386 /* give it a proper name */ 387 if (requested_name && requested_name[0]) { 388 int rv; 389 390 rtnl_lock(); 391 rv = cfg80211_dev_check_name(rdev, requested_name); 392 393 if (rv < 0) { 394 rtnl_unlock(); 395 goto use_default_name; 396 } 397 398 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); 399 rtnl_unlock(); 400 if (rv) 401 goto use_default_name; 402 } else { 403 use_default_name: 404 /* NOTE: This is *probably* safe w/out holding rtnl because of 405 * the restrictions on phy names. Probably this call could 406 * fail if some other part of the kernel (re)named a device 407 * phyX. But, might should add some locking and check return 408 * value, and use a different name if this one exists? 409 */ 410 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 411 } 412 413 INIT_LIST_HEAD(&rdev->wdev_list); 414 INIT_LIST_HEAD(&rdev->beacon_registrations); 415 spin_lock_init(&rdev->beacon_registrations_lock); 416 spin_lock_init(&rdev->bss_lock); 417 INIT_LIST_HEAD(&rdev->bss_list); 418 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 419 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results); 420 INIT_LIST_HEAD(&rdev->mlme_unreg); 421 spin_lock_init(&rdev->mlme_unreg_lock); 422 INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk); 423 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 424 cfg80211_dfs_channels_update_work); 425 #ifdef CONFIG_CFG80211_WEXT 426 rdev->wiphy.wext = &cfg80211_wext_handler; 427 #endif 428 429 device_initialize(&rdev->wiphy.dev); 430 rdev->wiphy.dev.class = &ieee80211_class; 431 rdev->wiphy.dev.platform_data = rdev; 432 device_enable_async_suspend(&rdev->wiphy.dev); 433 434 INIT_LIST_HEAD(&rdev->destroy_list); 435 spin_lock_init(&rdev->destroy_list_lock); 436 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 437 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 438 439 #ifdef CONFIG_CFG80211_DEFAULT_PS 440 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 441 #endif 442 443 wiphy_net_set(&rdev->wiphy, &init_net); 444 445 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 446 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 447 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 448 &rdev->rfkill_ops, rdev); 449 450 if (!rdev->rfkill) { 451 kfree(rdev); 452 return NULL; 453 } 454 455 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); 456 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 457 INIT_WORK(&rdev->event_work, cfg80211_event_work); 458 459 init_waitqueue_head(&rdev->dev_wait); 460 461 /* 462 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 463 * Fragmentation and RTS threshold are disabled by default with the 464 * special -1 value. 465 */ 466 rdev->wiphy.retry_short = 7; 467 rdev->wiphy.retry_long = 4; 468 rdev->wiphy.frag_threshold = (u32) -1; 469 rdev->wiphy.rts_threshold = (u32) -1; 470 rdev->wiphy.coverage_class = 0; 471 472 rdev->wiphy.max_num_csa_counters = 1; 473 474 rdev->wiphy.max_sched_scan_plans = 1; 475 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 476 477 return &rdev->wiphy; 478 } 479 EXPORT_SYMBOL(wiphy_new_nm); 480 481 static int wiphy_verify_combinations(struct wiphy *wiphy) 482 { 483 const struct ieee80211_iface_combination *c; 484 int i, j; 485 486 for (i = 0; i < wiphy->n_iface_combinations; i++) { 487 u32 cnt = 0; 488 u16 all_iftypes = 0; 489 490 c = &wiphy->iface_combinations[i]; 491 492 /* 493 * Combinations with just one interface aren't real, 494 * however we make an exception for DFS. 495 */ 496 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 497 return -EINVAL; 498 499 /* Need at least one channel */ 500 if (WARN_ON(!c->num_different_channels)) 501 return -EINVAL; 502 503 /* 504 * Put a sane limit on maximum number of different 505 * channels to simplify channel accounting code. 506 */ 507 if (WARN_ON(c->num_different_channels > 508 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 509 return -EINVAL; 510 511 /* DFS only works on one channel. */ 512 if (WARN_ON(c->radar_detect_widths && 513 (c->num_different_channels > 1))) 514 return -EINVAL; 515 516 if (WARN_ON(!c->n_limits)) 517 return -EINVAL; 518 519 for (j = 0; j < c->n_limits; j++) { 520 u16 types = c->limits[j].types; 521 522 /* interface types shouldn't overlap */ 523 if (WARN_ON(types & all_iftypes)) 524 return -EINVAL; 525 all_iftypes |= types; 526 527 if (WARN_ON(!c->limits[j].max)) 528 return -EINVAL; 529 530 /* Shouldn't list software iftypes in combinations! */ 531 if (WARN_ON(wiphy->software_iftypes & types)) 532 return -EINVAL; 533 534 /* Only a single P2P_DEVICE can be allowed */ 535 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 536 c->limits[j].max > 1)) 537 return -EINVAL; 538 539 cnt += c->limits[j].max; 540 /* 541 * Don't advertise an unsupported type 542 * in a combination. 543 */ 544 if (WARN_ON((wiphy->interface_modes & types) != types)) 545 return -EINVAL; 546 } 547 548 /* You can't even choose that many! */ 549 if (WARN_ON(cnt < c->max_interfaces)) 550 return -EINVAL; 551 } 552 553 return 0; 554 } 555 556 int wiphy_register(struct wiphy *wiphy) 557 { 558 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 559 int res; 560 enum nl80211_band band; 561 struct ieee80211_supported_band *sband; 562 bool have_band = false; 563 int i; 564 u16 ifmodes = wiphy->interface_modes; 565 566 #ifdef CONFIG_PM 567 if (WARN_ON(wiphy->wowlan && 568 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 569 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 570 return -EINVAL; 571 if (WARN_ON(wiphy->wowlan && 572 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 573 !wiphy->wowlan->tcp)) 574 return -EINVAL; 575 #endif 576 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 577 (!rdev->ops->tdls_channel_switch || 578 !rdev->ops->tdls_cancel_channel_switch))) 579 return -EINVAL; 580 581 /* 582 * if a wiphy has unsupported modes for regulatory channel enforcement, 583 * opt-out of enforcement checking 584 */ 585 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) | 586 BIT(NL80211_IFTYPE_P2P_CLIENT) | 587 BIT(NL80211_IFTYPE_AP) | 588 BIT(NL80211_IFTYPE_P2P_GO) | 589 BIT(NL80211_IFTYPE_ADHOC) | 590 BIT(NL80211_IFTYPE_P2P_DEVICE) | 591 BIT(NL80211_IFTYPE_AP_VLAN) | 592 BIT(NL80211_IFTYPE_MONITOR))) 593 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF; 594 595 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 596 (wiphy->regulatory_flags & 597 (REGULATORY_CUSTOM_REG | 598 REGULATORY_STRICT_REG | 599 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 600 REGULATORY_COUNTRY_IE_IGNORE)))) 601 return -EINVAL; 602 603 if (WARN_ON(wiphy->coalesce && 604 (!wiphy->coalesce->n_rules || 605 !wiphy->coalesce->n_patterns) && 606 (!wiphy->coalesce->pattern_min_len || 607 wiphy->coalesce->pattern_min_len > 608 wiphy->coalesce->pattern_max_len))) 609 return -EINVAL; 610 611 if (WARN_ON(wiphy->ap_sme_capa && 612 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 613 return -EINVAL; 614 615 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 616 return -EINVAL; 617 618 if (WARN_ON(wiphy->addresses && 619 !is_zero_ether_addr(wiphy->perm_addr) && 620 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 621 ETH_ALEN))) 622 return -EINVAL; 623 624 if (WARN_ON(wiphy->max_acl_mac_addrs && 625 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 626 !rdev->ops->set_mac_acl))) 627 return -EINVAL; 628 629 /* assure only valid behaviours are flagged by driver 630 * hence subtract 2 as bit 0 is invalid. 631 */ 632 if (WARN_ON(wiphy->bss_select_support && 633 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 634 return -EINVAL; 635 636 if (wiphy->addresses) 637 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 638 639 /* sanity check ifmodes */ 640 WARN_ON(!ifmodes); 641 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 642 if (WARN_ON(ifmodes != wiphy->interface_modes)) 643 wiphy->interface_modes = ifmodes; 644 645 res = wiphy_verify_combinations(wiphy); 646 if (res) 647 return res; 648 649 /* sanity check supported bands/channels */ 650 for (band = 0; band < NUM_NL80211_BANDS; band++) { 651 sband = wiphy->bands[band]; 652 if (!sband) 653 continue; 654 655 sband->band = band; 656 if (WARN_ON(!sband->n_channels)) 657 return -EINVAL; 658 /* 659 * on 60GHz band, there are no legacy rates, so 660 * n_bitrates is 0 661 */ 662 if (WARN_ON(band != NL80211_BAND_60GHZ && 663 !sband->n_bitrates)) 664 return -EINVAL; 665 666 /* 667 * Since cfg80211_disable_40mhz_24ghz is global, we can 668 * modify the sband's ht data even if the driver uses a 669 * global structure for that. 670 */ 671 if (cfg80211_disable_40mhz_24ghz && 672 band == NL80211_BAND_2GHZ && 673 sband->ht_cap.ht_supported) { 674 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 675 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 676 } 677 678 /* 679 * Since we use a u32 for rate bitmaps in 680 * ieee80211_get_response_rate, we cannot 681 * have more than 32 legacy rates. 682 */ 683 if (WARN_ON(sband->n_bitrates > 32)) 684 return -EINVAL; 685 686 for (i = 0; i < sband->n_channels; i++) { 687 sband->channels[i].orig_flags = 688 sband->channels[i].flags; 689 sband->channels[i].orig_mag = INT_MAX; 690 sband->channels[i].orig_mpwr = 691 sband->channels[i].max_power; 692 sband->channels[i].band = band; 693 } 694 695 have_band = true; 696 } 697 698 if (!have_band) { 699 WARN_ON(1); 700 return -EINVAL; 701 } 702 703 #ifdef CONFIG_PM 704 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 705 (!rdev->wiphy.wowlan->pattern_min_len || 706 rdev->wiphy.wowlan->pattern_min_len > 707 rdev->wiphy.wowlan->pattern_max_len))) 708 return -EINVAL; 709 #endif 710 711 /* check and set up bitrates */ 712 ieee80211_set_bitrate_flags(wiphy); 713 714 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 715 716 rtnl_lock(); 717 res = device_add(&rdev->wiphy.dev); 718 if (res) { 719 rtnl_unlock(); 720 return res; 721 } 722 723 /* set up regulatory info */ 724 wiphy_regulatory_register(wiphy); 725 726 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 727 cfg80211_rdev_list_generation++; 728 729 /* add to debugfs */ 730 rdev->wiphy.debugfsdir = 731 debugfs_create_dir(wiphy_name(&rdev->wiphy), 732 ieee80211_debugfs_dir); 733 if (IS_ERR(rdev->wiphy.debugfsdir)) 734 rdev->wiphy.debugfsdir = NULL; 735 736 cfg80211_debugfs_rdev_add(rdev); 737 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 738 739 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 740 struct regulatory_request request; 741 742 request.wiphy_idx = get_wiphy_idx(wiphy); 743 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 744 request.alpha2[0] = '9'; 745 request.alpha2[1] = '9'; 746 747 nl80211_send_reg_change_event(&request); 748 } 749 750 rdev->wiphy.registered = true; 751 rtnl_unlock(); 752 753 res = rfkill_register(rdev->rfkill); 754 if (res) { 755 rfkill_destroy(rdev->rfkill); 756 rdev->rfkill = NULL; 757 wiphy_unregister(&rdev->wiphy); 758 return res; 759 } 760 761 return 0; 762 } 763 EXPORT_SYMBOL(wiphy_register); 764 765 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 766 { 767 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 768 769 if (!rdev->ops->rfkill_poll) 770 return; 771 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 772 rfkill_resume_polling(rdev->rfkill); 773 } 774 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 775 776 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 777 { 778 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 779 780 rfkill_pause_polling(rdev->rfkill); 781 } 782 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 783 784 void wiphy_unregister(struct wiphy *wiphy) 785 { 786 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 787 788 wait_event(rdev->dev_wait, ({ 789 int __count; 790 rtnl_lock(); 791 __count = rdev->opencount; 792 rtnl_unlock(); 793 __count == 0; })); 794 795 if (rdev->rfkill) 796 rfkill_unregister(rdev->rfkill); 797 798 rtnl_lock(); 799 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 800 rdev->wiphy.registered = false; 801 802 WARN_ON(!list_empty(&rdev->wdev_list)); 803 804 /* 805 * First remove the hardware from everywhere, this makes 806 * it impossible to find from userspace. 807 */ 808 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 809 list_del_rcu(&rdev->list); 810 synchronize_rcu(); 811 812 /* 813 * If this device got a regulatory hint tell core its 814 * free to listen now to a new shiny device regulatory hint 815 */ 816 wiphy_regulatory_deregister(wiphy); 817 818 cfg80211_rdev_list_generation++; 819 device_del(&rdev->wiphy.dev); 820 821 rtnl_unlock(); 822 823 flush_work(&rdev->scan_done_wk); 824 cancel_work_sync(&rdev->conn_work); 825 flush_work(&rdev->event_work); 826 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 827 flush_work(&rdev->destroy_work); 828 flush_work(&rdev->sched_scan_stop_wk); 829 flush_work(&rdev->mlme_unreg_wk); 830 831 #ifdef CONFIG_PM 832 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 833 rdev_set_wakeup(rdev, false); 834 #endif 835 cfg80211_rdev_free_wowlan(rdev); 836 cfg80211_rdev_free_coalesce(rdev); 837 } 838 EXPORT_SYMBOL(wiphy_unregister); 839 840 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 841 { 842 struct cfg80211_internal_bss *scan, *tmp; 843 struct cfg80211_beacon_registration *reg, *treg; 844 rfkill_destroy(rdev->rfkill); 845 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 846 list_del(®->list); 847 kfree(reg); 848 } 849 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 850 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 851 kfree(rdev); 852 } 853 854 void wiphy_free(struct wiphy *wiphy) 855 { 856 put_device(&wiphy->dev); 857 } 858 EXPORT_SYMBOL(wiphy_free); 859 860 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 861 { 862 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 863 864 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 865 schedule_work(&rdev->rfkill_sync); 866 } 867 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 868 869 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 870 { 871 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 872 873 ASSERT_RTNL(); 874 875 if (WARN_ON(wdev->netdev)) 876 return; 877 878 list_del_rcu(&wdev->list); 879 rdev->devlist_generation++; 880 881 switch (wdev->iftype) { 882 case NL80211_IFTYPE_P2P_DEVICE: 883 cfg80211_mlme_purge_registrations(wdev); 884 cfg80211_stop_p2p_device(rdev, wdev); 885 break; 886 default: 887 WARN_ON_ONCE(1); 888 break; 889 } 890 } 891 EXPORT_SYMBOL(cfg80211_unregister_wdev); 892 893 static const struct device_type wiphy_type = { 894 .name = "wlan", 895 }; 896 897 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 898 enum nl80211_iftype iftype, int num) 899 { 900 ASSERT_RTNL(); 901 902 rdev->num_running_ifaces += num; 903 if (iftype == NL80211_IFTYPE_MONITOR) 904 rdev->num_running_monitor_ifaces += num; 905 } 906 907 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 908 struct wireless_dev *wdev) 909 { 910 struct net_device *dev = wdev->netdev; 911 struct cfg80211_sched_scan_request *sched_scan_req; 912 913 ASSERT_RTNL(); 914 ASSERT_WDEV_LOCK(wdev); 915 916 switch (wdev->iftype) { 917 case NL80211_IFTYPE_ADHOC: 918 __cfg80211_leave_ibss(rdev, dev, true); 919 break; 920 case NL80211_IFTYPE_P2P_CLIENT: 921 case NL80211_IFTYPE_STATION: 922 sched_scan_req = rtnl_dereference(rdev->sched_scan_req); 923 if (sched_scan_req && dev == sched_scan_req->dev) 924 __cfg80211_stop_sched_scan(rdev, false); 925 926 #ifdef CONFIG_CFG80211_WEXT 927 kfree(wdev->wext.ie); 928 wdev->wext.ie = NULL; 929 wdev->wext.ie_len = 0; 930 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 931 #endif 932 cfg80211_disconnect(rdev, dev, 933 WLAN_REASON_DEAUTH_LEAVING, true); 934 break; 935 case NL80211_IFTYPE_MESH_POINT: 936 __cfg80211_leave_mesh(rdev, dev); 937 break; 938 case NL80211_IFTYPE_AP: 939 case NL80211_IFTYPE_P2P_GO: 940 __cfg80211_stop_ap(rdev, dev, true); 941 break; 942 case NL80211_IFTYPE_OCB: 943 __cfg80211_leave_ocb(rdev, dev); 944 break; 945 case NL80211_IFTYPE_WDS: 946 /* must be handled by mac80211/driver, has no APIs */ 947 break; 948 case NL80211_IFTYPE_P2P_DEVICE: 949 /* cannot happen, has no netdev */ 950 break; 951 case NL80211_IFTYPE_AP_VLAN: 952 case NL80211_IFTYPE_MONITOR: 953 /* nothing to do */ 954 break; 955 case NL80211_IFTYPE_UNSPECIFIED: 956 case NUM_NL80211_IFTYPES: 957 /* invalid */ 958 break; 959 } 960 } 961 962 void cfg80211_leave(struct cfg80211_registered_device *rdev, 963 struct wireless_dev *wdev) 964 { 965 wdev_lock(wdev); 966 __cfg80211_leave(rdev, wdev); 967 wdev_unlock(wdev); 968 } 969 970 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 971 gfp_t gfp) 972 { 973 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 974 struct cfg80211_event *ev; 975 unsigned long flags; 976 977 trace_cfg80211_stop_iface(wiphy, wdev); 978 979 ev = kzalloc(sizeof(*ev), gfp); 980 if (!ev) 981 return; 982 983 ev->type = EVENT_STOPPED; 984 985 spin_lock_irqsave(&wdev->event_lock, flags); 986 list_add_tail(&ev->list, &wdev->event_list); 987 spin_unlock_irqrestore(&wdev->event_lock, flags); 988 queue_work(cfg80211_wq, &rdev->event_work); 989 } 990 EXPORT_SYMBOL(cfg80211_stop_iface); 991 992 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 993 unsigned long state, void *ptr) 994 { 995 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 996 struct wireless_dev *wdev = dev->ieee80211_ptr; 997 struct cfg80211_registered_device *rdev; 998 struct cfg80211_sched_scan_request *sched_scan_req; 999 1000 if (!wdev) 1001 return NOTIFY_DONE; 1002 1003 rdev = wiphy_to_rdev(wdev->wiphy); 1004 1005 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 1006 1007 switch (state) { 1008 case NETDEV_POST_INIT: 1009 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 1010 break; 1011 case NETDEV_REGISTER: 1012 /* 1013 * NB: cannot take rdev->mtx here because this may be 1014 * called within code protected by it when interfaces 1015 * are added with nl80211. 1016 */ 1017 mutex_init(&wdev->mtx); 1018 INIT_LIST_HEAD(&wdev->event_list); 1019 spin_lock_init(&wdev->event_lock); 1020 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1021 spin_lock_init(&wdev->mgmt_registrations_lock); 1022 1023 wdev->identifier = ++rdev->wdev_id; 1024 list_add_rcu(&wdev->list, &rdev->wdev_list); 1025 rdev->devlist_generation++; 1026 /* can only change netns with wiphy */ 1027 dev->features |= NETIF_F_NETNS_LOCAL; 1028 1029 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 1030 "phy80211")) { 1031 pr_err("failed to add phy80211 symlink to netdev!\n"); 1032 } 1033 wdev->netdev = dev; 1034 #ifdef CONFIG_CFG80211_WEXT 1035 wdev->wext.default_key = -1; 1036 wdev->wext.default_mgmt_key = -1; 1037 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1038 #endif 1039 1040 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1041 wdev->ps = true; 1042 else 1043 wdev->ps = false; 1044 /* allow mac80211 to determine the timeout */ 1045 wdev->ps_timeout = -1; 1046 1047 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1048 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1049 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1050 dev->priv_flags |= IFF_DONT_BRIDGE; 1051 break; 1052 case NETDEV_GOING_DOWN: 1053 cfg80211_leave(rdev, wdev); 1054 break; 1055 case NETDEV_DOWN: 1056 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1057 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1058 if (WARN_ON(!rdev->scan_req->notified)) 1059 rdev->scan_req->aborted = true; 1060 ___cfg80211_scan_done(rdev, false); 1061 } 1062 1063 sched_scan_req = rtnl_dereference(rdev->sched_scan_req); 1064 if (WARN_ON(sched_scan_req && 1065 sched_scan_req->dev == wdev->netdev)) { 1066 __cfg80211_stop_sched_scan(rdev, false); 1067 } 1068 1069 rdev->opencount--; 1070 wake_up(&rdev->dev_wait); 1071 break; 1072 case NETDEV_UP: 1073 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1074 wdev_lock(wdev); 1075 switch (wdev->iftype) { 1076 #ifdef CONFIG_CFG80211_WEXT 1077 case NL80211_IFTYPE_ADHOC: 1078 cfg80211_ibss_wext_join(rdev, wdev); 1079 break; 1080 case NL80211_IFTYPE_STATION: 1081 cfg80211_mgd_wext_connect(rdev, wdev); 1082 break; 1083 #endif 1084 #ifdef CONFIG_MAC80211_MESH 1085 case NL80211_IFTYPE_MESH_POINT: 1086 { 1087 /* backward compat code... */ 1088 struct mesh_setup setup; 1089 memcpy(&setup, &default_mesh_setup, 1090 sizeof(setup)); 1091 /* back compat only needed for mesh_id */ 1092 setup.mesh_id = wdev->ssid; 1093 setup.mesh_id_len = wdev->mesh_id_up_len; 1094 if (wdev->mesh_id_up_len) 1095 __cfg80211_join_mesh(rdev, dev, 1096 &setup, 1097 &default_mesh_config); 1098 break; 1099 } 1100 #endif 1101 default: 1102 break; 1103 } 1104 wdev_unlock(wdev); 1105 rdev->opencount++; 1106 1107 /* 1108 * Configure power management to the driver here so that its 1109 * correctly set also after interface type changes etc. 1110 */ 1111 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1112 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1113 rdev->ops->set_power_mgmt) 1114 if (rdev_set_power_mgmt(rdev, dev, wdev->ps, 1115 wdev->ps_timeout)) { 1116 /* assume this means it's off */ 1117 wdev->ps = false; 1118 } 1119 break; 1120 case NETDEV_UNREGISTER: 1121 /* 1122 * It is possible to get NETDEV_UNREGISTER 1123 * multiple times. To detect that, check 1124 * that the interface is still on the list 1125 * of registered interfaces, and only then 1126 * remove and clean it up. 1127 */ 1128 if (!list_empty(&wdev->list)) { 1129 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 1130 list_del_rcu(&wdev->list); 1131 rdev->devlist_generation++; 1132 cfg80211_mlme_purge_registrations(wdev); 1133 #ifdef CONFIG_CFG80211_WEXT 1134 kzfree(wdev->wext.keys); 1135 #endif 1136 } 1137 /* 1138 * synchronise (so that we won't find this netdev 1139 * from other code any more) and then clear the list 1140 * head so that the above code can safely check for 1141 * !list_empty() to avoid double-cleanup. 1142 */ 1143 synchronize_rcu(); 1144 INIT_LIST_HEAD(&wdev->list); 1145 /* 1146 * Ensure that all events have been processed and 1147 * freed. 1148 */ 1149 cfg80211_process_wdev_events(wdev); 1150 1151 if (WARN_ON(wdev->current_bss)) { 1152 cfg80211_unhold_bss(wdev->current_bss); 1153 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 1154 wdev->current_bss = NULL; 1155 } 1156 break; 1157 case NETDEV_PRE_UP: 1158 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 1159 return notifier_from_errno(-EOPNOTSUPP); 1160 if (rfkill_blocked(rdev->rfkill)) 1161 return notifier_from_errno(-ERFKILL); 1162 break; 1163 default: 1164 return NOTIFY_DONE; 1165 } 1166 1167 wireless_nlevent_flush(); 1168 1169 return NOTIFY_OK; 1170 } 1171 1172 static struct notifier_block cfg80211_netdev_notifier = { 1173 .notifier_call = cfg80211_netdev_notifier_call, 1174 }; 1175 1176 static void __net_exit cfg80211_pernet_exit(struct net *net) 1177 { 1178 struct cfg80211_registered_device *rdev; 1179 1180 rtnl_lock(); 1181 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1182 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1183 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1184 } 1185 rtnl_unlock(); 1186 } 1187 1188 static struct pernet_operations cfg80211_pernet_ops = { 1189 .exit = cfg80211_pernet_exit, 1190 }; 1191 1192 static int __init cfg80211_init(void) 1193 { 1194 int err; 1195 1196 err = register_pernet_device(&cfg80211_pernet_ops); 1197 if (err) 1198 goto out_fail_pernet; 1199 1200 err = wiphy_sysfs_init(); 1201 if (err) 1202 goto out_fail_sysfs; 1203 1204 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1205 if (err) 1206 goto out_fail_notifier; 1207 1208 err = nl80211_init(); 1209 if (err) 1210 goto out_fail_nl80211; 1211 1212 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1213 1214 err = regulatory_init(); 1215 if (err) 1216 goto out_fail_reg; 1217 1218 cfg80211_wq = create_singlethread_workqueue("cfg80211"); 1219 if (!cfg80211_wq) { 1220 err = -ENOMEM; 1221 goto out_fail_wq; 1222 } 1223 1224 return 0; 1225 1226 out_fail_wq: 1227 regulatory_exit(); 1228 out_fail_reg: 1229 debugfs_remove(ieee80211_debugfs_dir); 1230 nl80211_exit(); 1231 out_fail_nl80211: 1232 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1233 out_fail_notifier: 1234 wiphy_sysfs_exit(); 1235 out_fail_sysfs: 1236 unregister_pernet_device(&cfg80211_pernet_ops); 1237 out_fail_pernet: 1238 return err; 1239 } 1240 subsys_initcall(cfg80211_init); 1241 1242 static void __exit cfg80211_exit(void) 1243 { 1244 debugfs_remove(ieee80211_debugfs_dir); 1245 nl80211_exit(); 1246 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1247 wiphy_sysfs_exit(); 1248 regulatory_exit(); 1249 unregister_pernet_device(&cfg80211_pernet_ops); 1250 destroy_workqueue(cfg80211_wq); 1251 } 1252 module_exit(cfg80211_exit); 1253