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); 366 367 alloc_size = sizeof(*rdev) + sizeof_priv; 368 369 rdev = kzalloc(alloc_size, GFP_KERNEL); 370 if (!rdev) 371 return NULL; 372 373 rdev->ops = ops; 374 375 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 376 377 if (unlikely(rdev->wiphy_idx < 0)) { 378 /* ugh, wrapped! */ 379 atomic_dec(&wiphy_counter); 380 kfree(rdev); 381 return NULL; 382 } 383 384 /* atomic_inc_return makes it start at 1, make it start at 0 */ 385 rdev->wiphy_idx--; 386 387 /* give it a proper name */ 388 if (requested_name && requested_name[0]) { 389 int rv; 390 391 rtnl_lock(); 392 rv = cfg80211_dev_check_name(rdev, requested_name); 393 394 if (rv < 0) { 395 rtnl_unlock(); 396 goto use_default_name; 397 } 398 399 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); 400 rtnl_unlock(); 401 if (rv) 402 goto use_default_name; 403 } else { 404 use_default_name: 405 /* NOTE: This is *probably* safe w/out holding rtnl because of 406 * the restrictions on phy names. Probably this call could 407 * fail if some other part of the kernel (re)named a device 408 * phyX. But, might should add some locking and check return 409 * value, and use a different name if this one exists? 410 */ 411 dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 412 } 413 414 INIT_LIST_HEAD(&rdev->wiphy.wdev_list); 415 INIT_LIST_HEAD(&rdev->beacon_registrations); 416 spin_lock_init(&rdev->beacon_registrations_lock); 417 spin_lock_init(&rdev->bss_lock); 418 INIT_LIST_HEAD(&rdev->bss_list); 419 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 420 INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results); 421 INIT_LIST_HEAD(&rdev->mlme_unreg); 422 spin_lock_init(&rdev->mlme_unreg_lock); 423 INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk); 424 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 425 cfg80211_dfs_channels_update_work); 426 #ifdef CONFIG_CFG80211_WEXT 427 rdev->wiphy.wext = &cfg80211_wext_handler; 428 #endif 429 430 device_initialize(&rdev->wiphy.dev); 431 rdev->wiphy.dev.class = &ieee80211_class; 432 rdev->wiphy.dev.platform_data = rdev; 433 device_enable_async_suspend(&rdev->wiphy.dev); 434 435 INIT_LIST_HEAD(&rdev->destroy_list); 436 spin_lock_init(&rdev->destroy_list_lock); 437 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 438 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 439 440 #ifdef CONFIG_CFG80211_DEFAULT_PS 441 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 442 #endif 443 444 wiphy_net_set(&rdev->wiphy, &init_net); 445 446 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 447 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 448 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 449 &rdev->rfkill_ops, rdev); 450 451 if (!rdev->rfkill) { 452 kfree(rdev); 453 return NULL; 454 } 455 456 INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); 457 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 458 INIT_WORK(&rdev->event_work, cfg80211_event_work); 459 460 init_waitqueue_head(&rdev->dev_wait); 461 462 /* 463 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 464 * Fragmentation and RTS threshold are disabled by default with the 465 * special -1 value. 466 */ 467 rdev->wiphy.retry_short = 7; 468 rdev->wiphy.retry_long = 4; 469 rdev->wiphy.frag_threshold = (u32) -1; 470 rdev->wiphy.rts_threshold = (u32) -1; 471 rdev->wiphy.coverage_class = 0; 472 473 rdev->wiphy.max_num_csa_counters = 1; 474 475 rdev->wiphy.max_sched_scan_plans = 1; 476 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 477 478 return &rdev->wiphy; 479 } 480 EXPORT_SYMBOL(wiphy_new_nm); 481 482 static int wiphy_verify_combinations(struct wiphy *wiphy) 483 { 484 const struct ieee80211_iface_combination *c; 485 int i, j; 486 487 for (i = 0; i < wiphy->n_iface_combinations; i++) { 488 u32 cnt = 0; 489 u16 all_iftypes = 0; 490 491 c = &wiphy->iface_combinations[i]; 492 493 /* 494 * Combinations with just one interface aren't real, 495 * however we make an exception for DFS. 496 */ 497 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 498 return -EINVAL; 499 500 /* Need at least one channel */ 501 if (WARN_ON(!c->num_different_channels)) 502 return -EINVAL; 503 504 /* 505 * Put a sane limit on maximum number of different 506 * channels to simplify channel accounting code. 507 */ 508 if (WARN_ON(c->num_different_channels > 509 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 510 return -EINVAL; 511 512 /* DFS only works on one channel. */ 513 if (WARN_ON(c->radar_detect_widths && 514 (c->num_different_channels > 1))) 515 return -EINVAL; 516 517 if (WARN_ON(!c->n_limits)) 518 return -EINVAL; 519 520 for (j = 0; j < c->n_limits; j++) { 521 u16 types = c->limits[j].types; 522 523 /* interface types shouldn't overlap */ 524 if (WARN_ON(types & all_iftypes)) 525 return -EINVAL; 526 all_iftypes |= types; 527 528 if (WARN_ON(!c->limits[j].max)) 529 return -EINVAL; 530 531 /* Shouldn't list software iftypes in combinations! */ 532 if (WARN_ON(wiphy->software_iftypes & types)) 533 return -EINVAL; 534 535 /* Only a single P2P_DEVICE can be allowed */ 536 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 537 c->limits[j].max > 1)) 538 return -EINVAL; 539 540 cnt += c->limits[j].max; 541 /* 542 * Don't advertise an unsupported type 543 * in a combination. 544 */ 545 if (WARN_ON((wiphy->interface_modes & types) != types)) 546 return -EINVAL; 547 } 548 549 /* You can't even choose that many! */ 550 if (WARN_ON(cnt < c->max_interfaces)) 551 return -EINVAL; 552 } 553 554 return 0; 555 } 556 557 int wiphy_register(struct wiphy *wiphy) 558 { 559 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 560 int res; 561 enum nl80211_band band; 562 struct ieee80211_supported_band *sband; 563 bool have_band = false; 564 int i; 565 u16 ifmodes = wiphy->interface_modes; 566 567 #ifdef CONFIG_PM 568 if (WARN_ON(wiphy->wowlan && 569 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 570 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 571 return -EINVAL; 572 if (WARN_ON(wiphy->wowlan && 573 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 574 !wiphy->wowlan->tcp)) 575 return -EINVAL; 576 #endif 577 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 578 (!rdev->ops->tdls_channel_switch || 579 !rdev->ops->tdls_cancel_channel_switch))) 580 return -EINVAL; 581 582 /* 583 * if a wiphy has unsupported modes for regulatory channel enforcement, 584 * opt-out of enforcement checking 585 */ 586 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) | 587 BIT(NL80211_IFTYPE_P2P_CLIENT) | 588 BIT(NL80211_IFTYPE_AP) | 589 BIT(NL80211_IFTYPE_P2P_GO) | 590 BIT(NL80211_IFTYPE_ADHOC) | 591 BIT(NL80211_IFTYPE_P2P_DEVICE) | 592 BIT(NL80211_IFTYPE_AP_VLAN) | 593 BIT(NL80211_IFTYPE_MONITOR))) 594 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF; 595 596 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 597 (wiphy->regulatory_flags & 598 (REGULATORY_CUSTOM_REG | 599 REGULATORY_STRICT_REG | 600 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 601 REGULATORY_COUNTRY_IE_IGNORE)))) 602 return -EINVAL; 603 604 if (WARN_ON(wiphy->coalesce && 605 (!wiphy->coalesce->n_rules || 606 !wiphy->coalesce->n_patterns) && 607 (!wiphy->coalesce->pattern_min_len || 608 wiphy->coalesce->pattern_min_len > 609 wiphy->coalesce->pattern_max_len))) 610 return -EINVAL; 611 612 if (WARN_ON(wiphy->ap_sme_capa && 613 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 614 return -EINVAL; 615 616 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 617 return -EINVAL; 618 619 if (WARN_ON(wiphy->addresses && 620 !is_zero_ether_addr(wiphy->perm_addr) && 621 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 622 ETH_ALEN))) 623 return -EINVAL; 624 625 if (WARN_ON(wiphy->max_acl_mac_addrs && 626 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 627 !rdev->ops->set_mac_acl))) 628 return -EINVAL; 629 630 /* assure only valid behaviours are flagged by driver 631 * hence subtract 2 as bit 0 is invalid. 632 */ 633 if (WARN_ON(wiphy->bss_select_support && 634 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 635 return -EINVAL; 636 637 if (wiphy->addresses) 638 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 639 640 /* sanity check ifmodes */ 641 WARN_ON(!ifmodes); 642 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 643 if (WARN_ON(ifmodes != wiphy->interface_modes)) 644 wiphy->interface_modes = ifmodes; 645 646 res = wiphy_verify_combinations(wiphy); 647 if (res) 648 return res; 649 650 /* sanity check supported bands/channels */ 651 for (band = 0; band < NUM_NL80211_BANDS; band++) { 652 sband = wiphy->bands[band]; 653 if (!sband) 654 continue; 655 656 sband->band = band; 657 if (WARN_ON(!sband->n_channels)) 658 return -EINVAL; 659 /* 660 * on 60GHz band, there are no legacy rates, so 661 * n_bitrates is 0 662 */ 663 if (WARN_ON(band != NL80211_BAND_60GHZ && 664 !sband->n_bitrates)) 665 return -EINVAL; 666 667 /* 668 * Since cfg80211_disable_40mhz_24ghz is global, we can 669 * modify the sband's ht data even if the driver uses a 670 * global structure for that. 671 */ 672 if (cfg80211_disable_40mhz_24ghz && 673 band == NL80211_BAND_2GHZ && 674 sband->ht_cap.ht_supported) { 675 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 676 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 677 } 678 679 /* 680 * Since we use a u32 for rate bitmaps in 681 * ieee80211_get_response_rate, we cannot 682 * have more than 32 legacy rates. 683 */ 684 if (WARN_ON(sband->n_bitrates > 32)) 685 return -EINVAL; 686 687 for (i = 0; i < sband->n_channels; i++) { 688 sband->channels[i].orig_flags = 689 sband->channels[i].flags; 690 sband->channels[i].orig_mag = INT_MAX; 691 sband->channels[i].orig_mpwr = 692 sband->channels[i].max_power; 693 sband->channels[i].band = band; 694 } 695 696 have_band = true; 697 } 698 699 if (!have_band) { 700 WARN_ON(1); 701 return -EINVAL; 702 } 703 704 #ifdef CONFIG_PM 705 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 706 (!rdev->wiphy.wowlan->pattern_min_len || 707 rdev->wiphy.wowlan->pattern_min_len > 708 rdev->wiphy.wowlan->pattern_max_len))) 709 return -EINVAL; 710 #endif 711 712 /* check and set up bitrates */ 713 ieee80211_set_bitrate_flags(wiphy); 714 715 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 716 717 rtnl_lock(); 718 res = device_add(&rdev->wiphy.dev); 719 if (res) { 720 rtnl_unlock(); 721 return res; 722 } 723 724 /* set up regulatory info */ 725 wiphy_regulatory_register(wiphy); 726 727 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 728 cfg80211_rdev_list_generation++; 729 730 /* add to debugfs */ 731 rdev->wiphy.debugfsdir = 732 debugfs_create_dir(wiphy_name(&rdev->wiphy), 733 ieee80211_debugfs_dir); 734 if (IS_ERR(rdev->wiphy.debugfsdir)) 735 rdev->wiphy.debugfsdir = NULL; 736 737 cfg80211_debugfs_rdev_add(rdev); 738 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 739 740 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 741 struct regulatory_request request; 742 743 request.wiphy_idx = get_wiphy_idx(wiphy); 744 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 745 request.alpha2[0] = '9'; 746 request.alpha2[1] = '9'; 747 748 nl80211_send_reg_change_event(&request); 749 } 750 751 rdev->wiphy.registered = true; 752 rtnl_unlock(); 753 754 res = rfkill_register(rdev->rfkill); 755 if (res) { 756 rfkill_destroy(rdev->rfkill); 757 rdev->rfkill = NULL; 758 wiphy_unregister(&rdev->wiphy); 759 return res; 760 } 761 762 return 0; 763 } 764 EXPORT_SYMBOL(wiphy_register); 765 766 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 767 { 768 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 769 770 if (!rdev->ops->rfkill_poll) 771 return; 772 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 773 rfkill_resume_polling(rdev->rfkill); 774 } 775 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 776 777 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 778 { 779 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 780 781 rfkill_pause_polling(rdev->rfkill); 782 } 783 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 784 785 void wiphy_unregister(struct wiphy *wiphy) 786 { 787 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 788 789 wait_event(rdev->dev_wait, ({ 790 int __count; 791 rtnl_lock(); 792 __count = rdev->opencount; 793 rtnl_unlock(); 794 __count == 0; })); 795 796 if (rdev->rfkill) 797 rfkill_unregister(rdev->rfkill); 798 799 rtnl_lock(); 800 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 801 rdev->wiphy.registered = false; 802 803 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 804 805 /* 806 * First remove the hardware from everywhere, this makes 807 * it impossible to find from userspace. 808 */ 809 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 810 list_del_rcu(&rdev->list); 811 synchronize_rcu(); 812 813 /* 814 * If this device got a regulatory hint tell core its 815 * free to listen now to a new shiny device regulatory hint 816 */ 817 wiphy_regulatory_deregister(wiphy); 818 819 cfg80211_rdev_list_generation++; 820 device_del(&rdev->wiphy.dev); 821 822 rtnl_unlock(); 823 824 flush_work(&rdev->scan_done_wk); 825 cancel_work_sync(&rdev->conn_work); 826 flush_work(&rdev->event_work); 827 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 828 flush_work(&rdev->destroy_work); 829 flush_work(&rdev->sched_scan_stop_wk); 830 flush_work(&rdev->mlme_unreg_wk); 831 832 #ifdef CONFIG_PM 833 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 834 rdev_set_wakeup(rdev, false); 835 #endif 836 cfg80211_rdev_free_wowlan(rdev); 837 cfg80211_rdev_free_coalesce(rdev); 838 } 839 EXPORT_SYMBOL(wiphy_unregister); 840 841 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 842 { 843 struct cfg80211_internal_bss *scan, *tmp; 844 struct cfg80211_beacon_registration *reg, *treg; 845 rfkill_destroy(rdev->rfkill); 846 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 847 list_del(®->list); 848 kfree(reg); 849 } 850 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 851 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 852 kfree(rdev); 853 } 854 855 void wiphy_free(struct wiphy *wiphy) 856 { 857 put_device(&wiphy->dev); 858 } 859 EXPORT_SYMBOL(wiphy_free); 860 861 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 862 { 863 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 864 865 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 866 schedule_work(&rdev->rfkill_sync); 867 } 868 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 869 870 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 871 { 872 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 873 874 ASSERT_RTNL(); 875 876 if (WARN_ON(wdev->netdev)) 877 return; 878 879 list_del_rcu(&wdev->list); 880 rdev->devlist_generation++; 881 882 switch (wdev->iftype) { 883 case NL80211_IFTYPE_P2P_DEVICE: 884 cfg80211_mlme_purge_registrations(wdev); 885 cfg80211_stop_p2p_device(rdev, wdev); 886 break; 887 default: 888 WARN_ON_ONCE(1); 889 break; 890 } 891 } 892 EXPORT_SYMBOL(cfg80211_unregister_wdev); 893 894 static const struct device_type wiphy_type = { 895 .name = "wlan", 896 }; 897 898 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 899 enum nl80211_iftype iftype, int num) 900 { 901 ASSERT_RTNL(); 902 903 rdev->num_running_ifaces += num; 904 if (iftype == NL80211_IFTYPE_MONITOR) 905 rdev->num_running_monitor_ifaces += num; 906 } 907 908 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 909 struct wireless_dev *wdev) 910 { 911 struct net_device *dev = wdev->netdev; 912 struct cfg80211_sched_scan_request *sched_scan_req; 913 914 ASSERT_RTNL(); 915 ASSERT_WDEV_LOCK(wdev); 916 917 switch (wdev->iftype) { 918 case NL80211_IFTYPE_ADHOC: 919 __cfg80211_leave_ibss(rdev, dev, true); 920 break; 921 case NL80211_IFTYPE_P2P_CLIENT: 922 case NL80211_IFTYPE_STATION: 923 sched_scan_req = rtnl_dereference(rdev->sched_scan_req); 924 if (sched_scan_req && dev == sched_scan_req->dev) 925 __cfg80211_stop_sched_scan(rdev, false); 926 927 #ifdef CONFIG_CFG80211_WEXT 928 kfree(wdev->wext.ie); 929 wdev->wext.ie = NULL; 930 wdev->wext.ie_len = 0; 931 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 932 #endif 933 cfg80211_disconnect(rdev, dev, 934 WLAN_REASON_DEAUTH_LEAVING, true); 935 break; 936 case NL80211_IFTYPE_MESH_POINT: 937 __cfg80211_leave_mesh(rdev, dev); 938 break; 939 case NL80211_IFTYPE_AP: 940 case NL80211_IFTYPE_P2P_GO: 941 __cfg80211_stop_ap(rdev, dev, true); 942 break; 943 case NL80211_IFTYPE_OCB: 944 __cfg80211_leave_ocb(rdev, dev); 945 break; 946 case NL80211_IFTYPE_WDS: 947 /* must be handled by mac80211/driver, has no APIs */ 948 break; 949 case NL80211_IFTYPE_P2P_DEVICE: 950 /* cannot happen, has no netdev */ 951 break; 952 case NL80211_IFTYPE_AP_VLAN: 953 case NL80211_IFTYPE_MONITOR: 954 /* nothing to do */ 955 break; 956 case NL80211_IFTYPE_UNSPECIFIED: 957 case NUM_NL80211_IFTYPES: 958 /* invalid */ 959 break; 960 } 961 } 962 963 void cfg80211_leave(struct cfg80211_registered_device *rdev, 964 struct wireless_dev *wdev) 965 { 966 wdev_lock(wdev); 967 __cfg80211_leave(rdev, wdev); 968 wdev_unlock(wdev); 969 } 970 971 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 972 gfp_t gfp) 973 { 974 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 975 struct cfg80211_event *ev; 976 unsigned long flags; 977 978 trace_cfg80211_stop_iface(wiphy, wdev); 979 980 ev = kzalloc(sizeof(*ev), gfp); 981 if (!ev) 982 return; 983 984 ev->type = EVENT_STOPPED; 985 986 spin_lock_irqsave(&wdev->event_lock, flags); 987 list_add_tail(&ev->list, &wdev->event_list); 988 spin_unlock_irqrestore(&wdev->event_lock, flags); 989 queue_work(cfg80211_wq, &rdev->event_work); 990 } 991 EXPORT_SYMBOL(cfg80211_stop_iface); 992 993 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 994 unsigned long state, void *ptr) 995 { 996 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 997 struct wireless_dev *wdev = dev->ieee80211_ptr; 998 struct cfg80211_registered_device *rdev; 999 struct cfg80211_sched_scan_request *sched_scan_req; 1000 1001 if (!wdev) 1002 return NOTIFY_DONE; 1003 1004 rdev = wiphy_to_rdev(wdev->wiphy); 1005 1006 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 1007 1008 switch (state) { 1009 case NETDEV_POST_INIT: 1010 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 1011 break; 1012 case NETDEV_REGISTER: 1013 /* 1014 * NB: cannot take rdev->mtx here because this may be 1015 * called within code protected by it when interfaces 1016 * are added with nl80211. 1017 */ 1018 mutex_init(&wdev->mtx); 1019 INIT_LIST_HEAD(&wdev->event_list); 1020 spin_lock_init(&wdev->event_lock); 1021 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1022 spin_lock_init(&wdev->mgmt_registrations_lock); 1023 1024 wdev->identifier = ++rdev->wdev_id; 1025 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list); 1026 rdev->devlist_generation++; 1027 /* can only change netns with wiphy */ 1028 dev->features |= NETIF_F_NETNS_LOCAL; 1029 1030 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 1031 "phy80211")) { 1032 pr_err("failed to add phy80211 symlink to netdev!\n"); 1033 } 1034 wdev->netdev = dev; 1035 #ifdef CONFIG_CFG80211_WEXT 1036 wdev->wext.default_key = -1; 1037 wdev->wext.default_mgmt_key = -1; 1038 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1039 #endif 1040 1041 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1042 wdev->ps = true; 1043 else 1044 wdev->ps = false; 1045 /* allow mac80211 to determine the timeout */ 1046 wdev->ps_timeout = -1; 1047 1048 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1049 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1050 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1051 dev->priv_flags |= IFF_DONT_BRIDGE; 1052 break; 1053 case NETDEV_GOING_DOWN: 1054 cfg80211_leave(rdev, wdev); 1055 break; 1056 case NETDEV_DOWN: 1057 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1058 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1059 if (WARN_ON(!rdev->scan_req->notified)) 1060 rdev->scan_req->aborted = true; 1061 ___cfg80211_scan_done(rdev, false); 1062 } 1063 1064 sched_scan_req = rtnl_dereference(rdev->sched_scan_req); 1065 if (WARN_ON(sched_scan_req && 1066 sched_scan_req->dev == wdev->netdev)) { 1067 __cfg80211_stop_sched_scan(rdev, false); 1068 } 1069 1070 rdev->opencount--; 1071 wake_up(&rdev->dev_wait); 1072 break; 1073 case NETDEV_UP: 1074 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1075 wdev_lock(wdev); 1076 switch (wdev->iftype) { 1077 #ifdef CONFIG_CFG80211_WEXT 1078 case NL80211_IFTYPE_ADHOC: 1079 cfg80211_ibss_wext_join(rdev, wdev); 1080 break; 1081 case NL80211_IFTYPE_STATION: 1082 cfg80211_mgd_wext_connect(rdev, wdev); 1083 break; 1084 #endif 1085 #ifdef CONFIG_MAC80211_MESH 1086 case NL80211_IFTYPE_MESH_POINT: 1087 { 1088 /* backward compat code... */ 1089 struct mesh_setup setup; 1090 memcpy(&setup, &default_mesh_setup, 1091 sizeof(setup)); 1092 /* back compat only needed for mesh_id */ 1093 setup.mesh_id = wdev->ssid; 1094 setup.mesh_id_len = wdev->mesh_id_up_len; 1095 if (wdev->mesh_id_up_len) 1096 __cfg80211_join_mesh(rdev, dev, 1097 &setup, 1098 &default_mesh_config); 1099 break; 1100 } 1101 #endif 1102 default: 1103 break; 1104 } 1105 wdev_unlock(wdev); 1106 rdev->opencount++; 1107 1108 /* 1109 * Configure power management to the driver here so that its 1110 * correctly set also after interface type changes etc. 1111 */ 1112 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1113 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1114 rdev->ops->set_power_mgmt) 1115 if (rdev_set_power_mgmt(rdev, dev, wdev->ps, 1116 wdev->ps_timeout)) { 1117 /* assume this means it's off */ 1118 wdev->ps = false; 1119 } 1120 break; 1121 case NETDEV_UNREGISTER: 1122 /* 1123 * It is possible to get NETDEV_UNREGISTER 1124 * multiple times. To detect that, check 1125 * that the interface is still on the list 1126 * of registered interfaces, and only then 1127 * remove and clean it up. 1128 */ 1129 if (!list_empty(&wdev->list)) { 1130 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 1131 list_del_rcu(&wdev->list); 1132 rdev->devlist_generation++; 1133 cfg80211_mlme_purge_registrations(wdev); 1134 #ifdef CONFIG_CFG80211_WEXT 1135 kzfree(wdev->wext.keys); 1136 #endif 1137 } 1138 /* 1139 * synchronise (so that we won't find this netdev 1140 * from other code any more) and then clear the list 1141 * head so that the above code can safely check for 1142 * !list_empty() to avoid double-cleanup. 1143 */ 1144 synchronize_rcu(); 1145 INIT_LIST_HEAD(&wdev->list); 1146 /* 1147 * Ensure that all events have been processed and 1148 * freed. 1149 */ 1150 cfg80211_process_wdev_events(wdev); 1151 1152 if (WARN_ON(wdev->current_bss)) { 1153 cfg80211_unhold_bss(wdev->current_bss); 1154 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 1155 wdev->current_bss = NULL; 1156 } 1157 break; 1158 case NETDEV_PRE_UP: 1159 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) 1160 return notifier_from_errno(-EOPNOTSUPP); 1161 if (rfkill_blocked(rdev->rfkill)) 1162 return notifier_from_errno(-ERFKILL); 1163 break; 1164 default: 1165 return NOTIFY_DONE; 1166 } 1167 1168 wireless_nlevent_flush(); 1169 1170 return NOTIFY_OK; 1171 } 1172 1173 static struct notifier_block cfg80211_netdev_notifier = { 1174 .notifier_call = cfg80211_netdev_notifier_call, 1175 }; 1176 1177 static void __net_exit cfg80211_pernet_exit(struct net *net) 1178 { 1179 struct cfg80211_registered_device *rdev; 1180 1181 rtnl_lock(); 1182 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1183 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1184 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1185 } 1186 rtnl_unlock(); 1187 } 1188 1189 static struct pernet_operations cfg80211_pernet_ops = { 1190 .exit = cfg80211_pernet_exit, 1191 }; 1192 1193 static int __init cfg80211_init(void) 1194 { 1195 int err; 1196 1197 err = register_pernet_device(&cfg80211_pernet_ops); 1198 if (err) 1199 goto out_fail_pernet; 1200 1201 err = wiphy_sysfs_init(); 1202 if (err) 1203 goto out_fail_sysfs; 1204 1205 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1206 if (err) 1207 goto out_fail_notifier; 1208 1209 err = nl80211_init(); 1210 if (err) 1211 goto out_fail_nl80211; 1212 1213 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1214 1215 err = regulatory_init(); 1216 if (err) 1217 goto out_fail_reg; 1218 1219 cfg80211_wq = create_singlethread_workqueue("cfg80211"); 1220 if (!cfg80211_wq) { 1221 err = -ENOMEM; 1222 goto out_fail_wq; 1223 } 1224 1225 return 0; 1226 1227 out_fail_wq: 1228 regulatory_exit(); 1229 out_fail_reg: 1230 debugfs_remove(ieee80211_debugfs_dir); 1231 nl80211_exit(); 1232 out_fail_nl80211: 1233 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1234 out_fail_notifier: 1235 wiphy_sysfs_exit(); 1236 out_fail_sysfs: 1237 unregister_pernet_device(&cfg80211_pernet_ops); 1238 out_fail_pernet: 1239 return err; 1240 } 1241 subsys_initcall(cfg80211_init); 1242 1243 static void __exit cfg80211_exit(void) 1244 { 1245 debugfs_remove(ieee80211_debugfs_dir); 1246 nl80211_exit(); 1247 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1248 wiphy_sysfs_exit(); 1249 regulatory_exit(); 1250 unregister_pernet_device(&cfg80211_pernet_ops); 1251 destroy_workqueue(cfg80211_wq); 1252 } 1253 module_exit(cfg80211_exit); 1254