1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * This is the linux wireless configuration interface. 4 * 5 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net> 6 * Copyright 2013-2014 Intel Mobile Communications GmbH 7 * Copyright 2015-2017 Intel Deutschland GmbH 8 * Copyright (C) 2018-2022 Intel Corporation 9 */ 10 11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 12 13 #include <linux/if.h> 14 #include <linux/module.h> 15 #include <linux/err.h> 16 #include <linux/list.h> 17 #include <linux/slab.h> 18 #include <linux/nl80211.h> 19 #include <linux/debugfs.h> 20 #include <linux/notifier.h> 21 #include <linux/device.h> 22 #include <linux/etherdevice.h> 23 #include <linux/rtnetlink.h> 24 #include <linux/sched.h> 25 #include <net/genetlink.h> 26 #include <net/cfg80211.h> 27 #include "nl80211.h" 28 #include "core.h" 29 #include "sysfs.h" 30 #include "debugfs.h" 31 #include "wext-compat.h" 32 #include "rdev-ops.h" 33 34 /* name for sysfs, %d is appended */ 35 #define PHY_NAME "phy" 36 37 MODULE_AUTHOR("Johannes Berg"); 38 MODULE_LICENSE("GPL"); 39 MODULE_DESCRIPTION("wireless configuration support"); 40 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME); 41 42 /* RCU-protected (and RTNL for writers) */ 43 LIST_HEAD(cfg80211_rdev_list); 44 int cfg80211_rdev_list_generation; 45 46 /* for debugfs */ 47 static struct dentry *ieee80211_debugfs_dir; 48 49 /* for the cleanup, scan and event works */ 50 struct workqueue_struct *cfg80211_wq; 51 52 static bool cfg80211_disable_40mhz_24ghz; 53 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644); 54 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz, 55 "Disable 40MHz support in the 2.4GHz band"); 56 57 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx) 58 { 59 struct cfg80211_registered_device *result = NULL, *rdev; 60 61 ASSERT_RTNL(); 62 63 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 64 if (rdev->wiphy_idx == wiphy_idx) { 65 result = rdev; 66 break; 67 } 68 } 69 70 return result; 71 } 72 73 int get_wiphy_idx(struct wiphy *wiphy) 74 { 75 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 76 77 return rdev->wiphy_idx; 78 } 79 80 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx) 81 { 82 struct cfg80211_registered_device *rdev; 83 84 ASSERT_RTNL(); 85 86 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx); 87 if (!rdev) 88 return NULL; 89 return &rdev->wiphy; 90 } 91 92 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev, 93 const char *newname) 94 { 95 struct cfg80211_registered_device *rdev2; 96 int wiphy_idx, taken = -1, digits; 97 98 ASSERT_RTNL(); 99 100 if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN) 101 return -EINVAL; 102 103 /* prohibit calling the thing phy%d when %d is not its number */ 104 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken); 105 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) { 106 /* count number of places needed to print wiphy_idx */ 107 digits = 1; 108 while (wiphy_idx /= 10) 109 digits++; 110 /* 111 * deny the name if it is phy<idx> where <idx> is printed 112 * without leading zeroes. taken == strlen(newname) here 113 */ 114 if (taken == strlen(PHY_NAME) + digits) 115 return -EINVAL; 116 } 117 118 /* Ensure another device does not already have this name. */ 119 list_for_each_entry(rdev2, &cfg80211_rdev_list, list) 120 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0) 121 return -EINVAL; 122 123 return 0; 124 } 125 126 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, 127 char *newname) 128 { 129 int result; 130 131 ASSERT_RTNL(); 132 133 /* Ignore nop renames */ 134 if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0) 135 return 0; 136 137 result = cfg80211_dev_check_name(rdev, newname); 138 if (result < 0) 139 return result; 140 141 result = device_rename(&rdev->wiphy.dev, newname); 142 if (result) 143 return result; 144 145 if (!IS_ERR_OR_NULL(rdev->wiphy.debugfsdir)) 146 debugfs_rename(rdev->wiphy.debugfsdir->d_parent, 147 rdev->wiphy.debugfsdir, 148 rdev->wiphy.debugfsdir->d_parent, newname); 149 150 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 151 152 return 0; 153 } 154 155 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, 156 struct net *net) 157 { 158 struct wireless_dev *wdev; 159 int err = 0; 160 161 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK)) 162 return -EOPNOTSUPP; 163 164 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 165 if (!wdev->netdev) 166 continue; 167 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 168 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); 169 if (err) 170 break; 171 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 172 } 173 174 if (err) { 175 /* failed -- clean up to old netns */ 176 net = wiphy_net(&rdev->wiphy); 177 178 list_for_each_entry_continue_reverse(wdev, 179 &rdev->wiphy.wdev_list, 180 list) { 181 if (!wdev->netdev) 182 continue; 183 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 184 err = dev_change_net_namespace(wdev->netdev, net, 185 "wlan%d"); 186 WARN_ON(err); 187 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 188 } 189 190 return err; 191 } 192 193 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 194 if (!wdev->netdev) 195 continue; 196 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 197 } 198 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 199 200 wiphy_net_set(&rdev->wiphy, net); 201 202 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev)); 203 WARN_ON(err); 204 205 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 206 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 207 if (!wdev->netdev) 208 continue; 209 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 210 } 211 212 return 0; 213 } 214 215 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data) 216 { 217 struct cfg80211_registered_device *rdev = data; 218 219 rdev_rfkill_poll(rdev); 220 } 221 222 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev, 223 struct wireless_dev *wdev) 224 { 225 lockdep_assert_held(&rdev->wiphy.mtx); 226 227 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE)) 228 return; 229 230 if (!wdev_running(wdev)) 231 return; 232 233 rdev_stop_p2p_device(rdev, wdev); 234 wdev->is_running = false; 235 236 rdev->opencount--; 237 238 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 239 if (WARN_ON(!rdev->scan_req->notified && 240 (!rdev->int_scan_req || 241 !rdev->int_scan_req->notified))) 242 rdev->scan_req->info.aborted = true; 243 ___cfg80211_scan_done(rdev, false); 244 } 245 } 246 247 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev, 248 struct wireless_dev *wdev) 249 { 250 lockdep_assert_held(&rdev->wiphy.mtx); 251 252 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN)) 253 return; 254 255 if (!wdev_running(wdev)) 256 return; 257 258 rdev_stop_nan(rdev, wdev); 259 wdev->is_running = false; 260 261 rdev->opencount--; 262 } 263 264 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy) 265 { 266 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 267 struct wireless_dev *wdev; 268 269 ASSERT_RTNL(); 270 271 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 272 if (wdev->netdev) { 273 dev_close(wdev->netdev); 274 continue; 275 } 276 277 /* otherwise, check iftype */ 278 279 wiphy_lock(wiphy); 280 281 switch (wdev->iftype) { 282 case NL80211_IFTYPE_P2P_DEVICE: 283 cfg80211_stop_p2p_device(rdev, wdev); 284 break; 285 case NL80211_IFTYPE_NAN: 286 cfg80211_stop_nan(rdev, wdev); 287 break; 288 default: 289 break; 290 } 291 292 wiphy_unlock(wiphy); 293 } 294 } 295 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces); 296 297 static int cfg80211_rfkill_set_block(void *data, bool blocked) 298 { 299 struct cfg80211_registered_device *rdev = data; 300 301 if (!blocked) 302 return 0; 303 304 rtnl_lock(); 305 cfg80211_shutdown_all_interfaces(&rdev->wiphy); 306 rtnl_unlock(); 307 308 return 0; 309 } 310 311 static void cfg80211_rfkill_block_work(struct work_struct *work) 312 { 313 struct cfg80211_registered_device *rdev; 314 315 rdev = container_of(work, struct cfg80211_registered_device, 316 rfkill_block); 317 cfg80211_rfkill_set_block(rdev, true); 318 } 319 320 static void cfg80211_event_work(struct work_struct *work) 321 { 322 struct cfg80211_registered_device *rdev; 323 324 rdev = container_of(work, struct cfg80211_registered_device, 325 event_work); 326 327 wiphy_lock(&rdev->wiphy); 328 cfg80211_process_rdev_events(rdev); 329 wiphy_unlock(&rdev->wiphy); 330 } 331 332 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev) 333 { 334 struct wireless_dev *wdev, *tmp; 335 336 ASSERT_RTNL(); 337 338 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) { 339 if (wdev->nl_owner_dead) { 340 if (wdev->netdev) 341 dev_close(wdev->netdev); 342 343 wiphy_lock(&rdev->wiphy); 344 cfg80211_leave(rdev, wdev); 345 cfg80211_remove_virtual_intf(rdev, wdev); 346 wiphy_unlock(&rdev->wiphy); 347 } 348 } 349 } 350 351 static void cfg80211_destroy_iface_wk(struct work_struct *work) 352 { 353 struct cfg80211_registered_device *rdev; 354 355 rdev = container_of(work, struct cfg80211_registered_device, 356 destroy_work); 357 358 rtnl_lock(); 359 cfg80211_destroy_ifaces(rdev); 360 rtnl_unlock(); 361 } 362 363 static void cfg80211_sched_scan_stop_wk(struct work_struct *work) 364 { 365 struct cfg80211_registered_device *rdev; 366 struct cfg80211_sched_scan_request *req, *tmp; 367 368 rdev = container_of(work, struct cfg80211_registered_device, 369 sched_scan_stop_wk); 370 371 rtnl_lock(); 372 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { 373 if (req->nl_owner_dead) 374 cfg80211_stop_sched_scan_req(rdev, req, false); 375 } 376 rtnl_unlock(); 377 } 378 379 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work) 380 { 381 struct cfg80211_registered_device *rdev; 382 383 rdev = container_of(work, struct cfg80211_registered_device, 384 propagate_radar_detect_wk); 385 386 rtnl_lock(); 387 388 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef, 389 NL80211_DFS_UNAVAILABLE, 390 NL80211_RADAR_DETECTED); 391 392 rtnl_unlock(); 393 } 394 395 static void cfg80211_propagate_cac_done_wk(struct work_struct *work) 396 { 397 struct cfg80211_registered_device *rdev; 398 399 rdev = container_of(work, struct cfg80211_registered_device, 400 propagate_cac_done_wk); 401 402 rtnl_lock(); 403 404 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef, 405 NL80211_DFS_AVAILABLE, 406 NL80211_RADAR_CAC_FINISHED); 407 408 rtnl_unlock(); 409 } 410 411 /* exported functions */ 412 413 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, 414 const char *requested_name) 415 { 416 static atomic_t wiphy_counter = ATOMIC_INIT(0); 417 418 struct cfg80211_registered_device *rdev; 419 int alloc_size; 420 421 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 422 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 423 WARN_ON(ops->connect && !ops->disconnect); 424 WARN_ON(ops->join_ibss && !ops->leave_ibss); 425 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 426 WARN_ON(ops->add_station && !ops->del_station); 427 WARN_ON(ops->add_mpath && !ops->del_mpath); 428 WARN_ON(ops->join_mesh && !ops->leave_mesh); 429 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device); 430 WARN_ON(ops->start_ap && !ops->stop_ap); 431 WARN_ON(ops->join_ocb && !ops->leave_ocb); 432 WARN_ON(ops->suspend && !ops->resume); 433 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop); 434 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel); 435 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch); 436 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts); 437 438 alloc_size = sizeof(*rdev) + sizeof_priv; 439 440 rdev = kzalloc(alloc_size, GFP_KERNEL); 441 if (!rdev) 442 return NULL; 443 444 rdev->ops = ops; 445 446 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 447 448 if (unlikely(rdev->wiphy_idx < 0)) { 449 /* ugh, wrapped! */ 450 atomic_dec(&wiphy_counter); 451 kfree(rdev); 452 return NULL; 453 } 454 455 /* atomic_inc_return makes it start at 1, make it start at 0 */ 456 rdev->wiphy_idx--; 457 458 /* give it a proper name */ 459 if (requested_name && requested_name[0]) { 460 int rv; 461 462 rtnl_lock(); 463 rv = cfg80211_dev_check_name(rdev, requested_name); 464 465 if (rv < 0) { 466 rtnl_unlock(); 467 goto use_default_name; 468 } 469 470 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); 471 rtnl_unlock(); 472 if (rv) 473 goto use_default_name; 474 } else { 475 int rv; 476 477 use_default_name: 478 /* NOTE: This is *probably* safe w/out holding rtnl because of 479 * the restrictions on phy names. Probably this call could 480 * fail if some other part of the kernel (re)named a device 481 * phyX. But, might should add some locking and check return 482 * value, and use a different name if this one exists? 483 */ 484 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 485 if (rv < 0) { 486 kfree(rdev); 487 return NULL; 488 } 489 } 490 491 mutex_init(&rdev->wiphy.mtx); 492 INIT_LIST_HEAD(&rdev->wiphy.wdev_list); 493 INIT_LIST_HEAD(&rdev->beacon_registrations); 494 spin_lock_init(&rdev->beacon_registrations_lock); 495 spin_lock_init(&rdev->bss_lock); 496 INIT_LIST_HEAD(&rdev->bss_list); 497 INIT_LIST_HEAD(&rdev->sched_scan_req_list); 498 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 499 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 500 cfg80211_dfs_channels_update_work); 501 #ifdef CONFIG_CFG80211_WEXT 502 rdev->wiphy.wext = &cfg80211_wext_handler; 503 #endif 504 505 device_initialize(&rdev->wiphy.dev); 506 rdev->wiphy.dev.class = &ieee80211_class; 507 rdev->wiphy.dev.platform_data = rdev; 508 device_enable_async_suspend(&rdev->wiphy.dev); 509 510 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 511 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 512 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk); 513 INIT_WORK(&rdev->propagate_radar_detect_wk, 514 cfg80211_propagate_radar_detect_wk); 515 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk); 516 INIT_WORK(&rdev->mgmt_registrations_update_wk, 517 cfg80211_mgmt_registrations_update_wk); 518 spin_lock_init(&rdev->mgmt_registrations_lock); 519 520 #ifdef CONFIG_CFG80211_DEFAULT_PS 521 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 522 #endif 523 524 wiphy_net_set(&rdev->wiphy, &init_net); 525 526 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 527 rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 528 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 529 &rdev->rfkill_ops, rdev); 530 531 if (!rdev->wiphy.rfkill) { 532 wiphy_free(&rdev->wiphy); 533 return NULL; 534 } 535 536 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work); 537 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 538 INIT_WORK(&rdev->event_work, cfg80211_event_work); 539 INIT_WORK(&rdev->background_cac_abort_wk, 540 cfg80211_background_cac_abort_wk); 541 INIT_DELAYED_WORK(&rdev->background_cac_done_wk, 542 cfg80211_background_cac_done_wk); 543 544 init_waitqueue_head(&rdev->dev_wait); 545 546 /* 547 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 548 * Fragmentation and RTS threshold are disabled by default with the 549 * special -1 value. 550 */ 551 rdev->wiphy.retry_short = 7; 552 rdev->wiphy.retry_long = 4; 553 rdev->wiphy.frag_threshold = (u32) -1; 554 rdev->wiphy.rts_threshold = (u32) -1; 555 rdev->wiphy.coverage_class = 0; 556 557 rdev->wiphy.max_num_csa_counters = 1; 558 559 rdev->wiphy.max_sched_scan_plans = 1; 560 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 561 562 return &rdev->wiphy; 563 } 564 EXPORT_SYMBOL(wiphy_new_nm); 565 566 static int wiphy_verify_combinations(struct wiphy *wiphy) 567 { 568 const struct ieee80211_iface_combination *c; 569 int i, j; 570 571 for (i = 0; i < wiphy->n_iface_combinations; i++) { 572 u32 cnt = 0; 573 u16 all_iftypes = 0; 574 575 c = &wiphy->iface_combinations[i]; 576 577 /* 578 * Combinations with just one interface aren't real, 579 * however we make an exception for DFS. 580 */ 581 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 582 return -EINVAL; 583 584 /* Need at least one channel */ 585 if (WARN_ON(!c->num_different_channels)) 586 return -EINVAL; 587 588 /* DFS only works on one channel. */ 589 if (WARN_ON(c->radar_detect_widths && 590 (c->num_different_channels > 1))) 591 return -EINVAL; 592 593 if (WARN_ON(!c->n_limits)) 594 return -EINVAL; 595 596 for (j = 0; j < c->n_limits; j++) { 597 u16 types = c->limits[j].types; 598 599 /* interface types shouldn't overlap */ 600 if (WARN_ON(types & all_iftypes)) 601 return -EINVAL; 602 all_iftypes |= types; 603 604 if (WARN_ON(!c->limits[j].max)) 605 return -EINVAL; 606 607 /* Shouldn't list software iftypes in combinations! */ 608 if (WARN_ON(wiphy->software_iftypes & types)) 609 return -EINVAL; 610 611 /* Only a single P2P_DEVICE can be allowed */ 612 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 613 c->limits[j].max > 1)) 614 return -EINVAL; 615 616 /* Only a single NAN can be allowed */ 617 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) && 618 c->limits[j].max > 1)) 619 return -EINVAL; 620 621 /* 622 * This isn't well-defined right now. If you have an 623 * IBSS interface, then its beacon interval may change 624 * by joining other networks, and nothing prevents it 625 * from doing that. 626 * So technically we probably shouldn't even allow AP 627 * and IBSS in the same interface, but it seems that 628 * some drivers support that, possibly only with fixed 629 * beacon intervals for IBSS. 630 */ 631 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) && 632 c->beacon_int_min_gcd)) { 633 return -EINVAL; 634 } 635 636 cnt += c->limits[j].max; 637 /* 638 * Don't advertise an unsupported type 639 * in a combination. 640 */ 641 if (WARN_ON((wiphy->interface_modes & types) != types)) 642 return -EINVAL; 643 } 644 645 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS))) 646 return -EINVAL; 647 648 /* You can't even choose that many! */ 649 if (WARN_ON(cnt < c->max_interfaces)) 650 return -EINVAL; 651 } 652 653 return 0; 654 } 655 656 int wiphy_register(struct wiphy *wiphy) 657 { 658 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 659 int res; 660 enum nl80211_band band; 661 struct ieee80211_supported_band *sband; 662 bool have_band = false; 663 int i; 664 u16 ifmodes = wiphy->interface_modes; 665 666 #ifdef CONFIG_PM 667 if (WARN_ON(wiphy->wowlan && 668 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 669 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 670 return -EINVAL; 671 if (WARN_ON(wiphy->wowlan && 672 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 673 !wiphy->wowlan->tcp)) 674 return -EINVAL; 675 #endif 676 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 677 (!rdev->ops->tdls_channel_switch || 678 !rdev->ops->tdls_cancel_channel_switch))) 679 return -EINVAL; 680 681 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) && 682 (!rdev->ops->start_nan || !rdev->ops->stop_nan || 683 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func || 684 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ))))) 685 return -EINVAL; 686 687 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))) 688 return -EINVAL; 689 690 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported)) 691 return -EINVAL; 692 693 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) { 694 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap && 695 !wiphy->pmsr_capa->ftm.non_asap)) 696 return -EINVAL; 697 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles || 698 !wiphy->pmsr_capa->ftm.bandwidths)) 699 return -EINVAL; 700 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles & 701 ~(BIT(NL80211_PREAMBLE_LEGACY) | 702 BIT(NL80211_PREAMBLE_HT) | 703 BIT(NL80211_PREAMBLE_VHT) | 704 BIT(NL80211_PREAMBLE_HE) | 705 BIT(NL80211_PREAMBLE_DMG)))) 706 return -EINVAL; 707 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based || 708 wiphy->pmsr_capa->ftm.non_trigger_based) && 709 !(wiphy->pmsr_capa->ftm.preambles & 710 BIT(NL80211_PREAMBLE_HE)))) 711 return -EINVAL; 712 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths & 713 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) | 714 BIT(NL80211_CHAN_WIDTH_20) | 715 BIT(NL80211_CHAN_WIDTH_40) | 716 BIT(NL80211_CHAN_WIDTH_80) | 717 BIT(NL80211_CHAN_WIDTH_80P80) | 718 BIT(NL80211_CHAN_WIDTH_160) | 719 BIT(NL80211_CHAN_WIDTH_5) | 720 BIT(NL80211_CHAN_WIDTH_10)))) 721 return -EINVAL; 722 } 723 724 /* 725 * if a wiphy has unsupported modes for regulatory channel enforcement, 726 * opt-out of enforcement checking 727 */ 728 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) | 729 BIT(NL80211_IFTYPE_P2P_CLIENT) | 730 BIT(NL80211_IFTYPE_AP) | 731 BIT(NL80211_IFTYPE_MESH_POINT) | 732 BIT(NL80211_IFTYPE_P2P_GO) | 733 BIT(NL80211_IFTYPE_ADHOC) | 734 BIT(NL80211_IFTYPE_P2P_DEVICE) | 735 BIT(NL80211_IFTYPE_NAN) | 736 BIT(NL80211_IFTYPE_AP_VLAN) | 737 BIT(NL80211_IFTYPE_MONITOR))) 738 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF; 739 740 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 741 (wiphy->regulatory_flags & 742 (REGULATORY_CUSTOM_REG | 743 REGULATORY_STRICT_REG | 744 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 745 REGULATORY_COUNTRY_IE_IGNORE)))) 746 return -EINVAL; 747 748 if (WARN_ON(wiphy->coalesce && 749 (!wiphy->coalesce->n_rules || 750 !wiphy->coalesce->n_patterns) && 751 (!wiphy->coalesce->pattern_min_len || 752 wiphy->coalesce->pattern_min_len > 753 wiphy->coalesce->pattern_max_len))) 754 return -EINVAL; 755 756 if (WARN_ON(wiphy->ap_sme_capa && 757 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 758 return -EINVAL; 759 760 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 761 return -EINVAL; 762 763 if (WARN_ON(wiphy->addresses && 764 !is_zero_ether_addr(wiphy->perm_addr) && 765 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 766 ETH_ALEN))) 767 return -EINVAL; 768 769 if (WARN_ON(wiphy->max_acl_mac_addrs && 770 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 771 !rdev->ops->set_mac_acl))) 772 return -EINVAL; 773 774 /* assure only valid behaviours are flagged by driver 775 * hence subtract 2 as bit 0 is invalid. 776 */ 777 if (WARN_ON(wiphy->bss_select_support && 778 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 779 return -EINVAL; 780 781 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy, 782 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) && 783 (!rdev->ops->set_pmk || !rdev->ops->del_pmk))) 784 return -EINVAL; 785 786 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) && 787 rdev->ops->update_connect_params)) 788 return -EINVAL; 789 790 if (wiphy->addresses) 791 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 792 793 /* sanity check ifmodes */ 794 WARN_ON(!ifmodes); 795 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 796 if (WARN_ON(ifmodes != wiphy->interface_modes)) 797 wiphy->interface_modes = ifmodes; 798 799 res = wiphy_verify_combinations(wiphy); 800 if (res) 801 return res; 802 803 /* sanity check supported bands/channels */ 804 for (band = 0; band < NUM_NL80211_BANDS; band++) { 805 u16 types = 0; 806 bool have_he = false; 807 808 sband = wiphy->bands[band]; 809 if (!sband) 810 continue; 811 812 sband->band = band; 813 if (WARN_ON(!sband->n_channels)) 814 return -EINVAL; 815 /* 816 * on 60GHz or sub-1Ghz band, there are no legacy rates, so 817 * n_bitrates is 0 818 */ 819 if (WARN_ON((band != NL80211_BAND_60GHZ && 820 band != NL80211_BAND_S1GHZ) && 821 !sband->n_bitrates)) 822 return -EINVAL; 823 824 if (WARN_ON(band == NL80211_BAND_6GHZ && 825 (sband->ht_cap.ht_supported || 826 sband->vht_cap.vht_supported))) 827 return -EINVAL; 828 829 /* 830 * Since cfg80211_disable_40mhz_24ghz is global, we can 831 * modify the sband's ht data even if the driver uses a 832 * global structure for that. 833 */ 834 if (cfg80211_disable_40mhz_24ghz && 835 band == NL80211_BAND_2GHZ && 836 sband->ht_cap.ht_supported) { 837 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 838 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 839 } 840 841 /* 842 * Since we use a u32 for rate bitmaps in 843 * ieee80211_get_response_rate, we cannot 844 * have more than 32 legacy rates. 845 */ 846 if (WARN_ON(sband->n_bitrates > 32)) 847 return -EINVAL; 848 849 for (i = 0; i < sband->n_channels; i++) { 850 sband->channels[i].orig_flags = 851 sband->channels[i].flags; 852 sband->channels[i].orig_mag = INT_MAX; 853 sband->channels[i].orig_mpwr = 854 sband->channels[i].max_power; 855 sband->channels[i].band = band; 856 857 if (WARN_ON(sband->channels[i].freq_offset >= 1000)) 858 return -EINVAL; 859 } 860 861 for (i = 0; i < sband->n_iftype_data; i++) { 862 const struct ieee80211_sband_iftype_data *iftd; 863 864 iftd = &sband->iftype_data[i]; 865 866 if (WARN_ON(!iftd->types_mask)) 867 return -EINVAL; 868 if (WARN_ON(types & iftd->types_mask)) 869 return -EINVAL; 870 871 /* at least one piece of information must be present */ 872 if (WARN_ON(!iftd->he_cap.has_he)) 873 return -EINVAL; 874 875 types |= iftd->types_mask; 876 877 if (i == 0) 878 have_he = iftd->he_cap.has_he; 879 else 880 have_he = have_he && 881 iftd->he_cap.has_he; 882 } 883 884 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ)) 885 return -EINVAL; 886 887 have_band = true; 888 } 889 890 if (!have_band) { 891 WARN_ON(1); 892 return -EINVAL; 893 } 894 895 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) { 896 /* 897 * Validate we have a policy (can be explicitly set to 898 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that 899 * we have at least one of doit/dumpit. 900 */ 901 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy)) 902 return -EINVAL; 903 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit && 904 !rdev->wiphy.vendor_commands[i].dumpit)) 905 return -EINVAL; 906 } 907 908 #ifdef CONFIG_PM 909 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 910 (!rdev->wiphy.wowlan->pattern_min_len || 911 rdev->wiphy.wowlan->pattern_min_len > 912 rdev->wiphy.wowlan->pattern_max_len))) 913 return -EINVAL; 914 #endif 915 916 if (!wiphy->max_num_akm_suites) 917 wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES; 918 else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES || 919 wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES) 920 return -EINVAL; 921 922 /* check and set up bitrates */ 923 ieee80211_set_bitrate_flags(wiphy); 924 925 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 926 927 rtnl_lock(); 928 res = device_add(&rdev->wiphy.dev); 929 if (res) { 930 rtnl_unlock(); 931 return res; 932 } 933 934 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 935 cfg80211_rdev_list_generation++; 936 937 /* add to debugfs */ 938 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy), 939 ieee80211_debugfs_dir); 940 941 cfg80211_debugfs_rdev_add(rdev); 942 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 943 944 /* set up regulatory info */ 945 wiphy_regulatory_register(wiphy); 946 947 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 948 struct regulatory_request request; 949 950 request.wiphy_idx = get_wiphy_idx(wiphy); 951 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 952 request.alpha2[0] = '9'; 953 request.alpha2[1] = '9'; 954 955 nl80211_send_reg_change_event(&request); 956 } 957 958 /* Check that nobody globally advertises any capabilities they do not 959 * advertise on all possible interface types. 960 */ 961 if (wiphy->extended_capabilities_len && 962 wiphy->num_iftype_ext_capab && 963 wiphy->iftype_ext_capab) { 964 u8 supported_on_all, j; 965 const struct wiphy_iftype_ext_capab *capab; 966 967 capab = wiphy->iftype_ext_capab; 968 for (j = 0; j < wiphy->extended_capabilities_len; j++) { 969 if (capab[0].extended_capabilities_len > j) 970 supported_on_all = 971 capab[0].extended_capabilities[j]; 972 else 973 supported_on_all = 0x00; 974 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) { 975 if (j >= capab[i].extended_capabilities_len) { 976 supported_on_all = 0x00; 977 break; 978 } 979 supported_on_all &= 980 capab[i].extended_capabilities[j]; 981 } 982 if (WARN_ON(wiphy->extended_capabilities[j] & 983 ~supported_on_all)) 984 break; 985 } 986 } 987 988 rdev->wiphy.registered = true; 989 rtnl_unlock(); 990 991 res = rfkill_register(rdev->wiphy.rfkill); 992 if (res) { 993 rfkill_destroy(rdev->wiphy.rfkill); 994 rdev->wiphy.rfkill = NULL; 995 wiphy_unregister(&rdev->wiphy); 996 return res; 997 } 998 999 return 0; 1000 } 1001 EXPORT_SYMBOL(wiphy_register); 1002 1003 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 1004 { 1005 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1006 1007 if (!rdev->ops->rfkill_poll) 1008 return; 1009 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 1010 rfkill_resume_polling(wiphy->rfkill); 1011 } 1012 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 1013 1014 void wiphy_unregister(struct wiphy *wiphy) 1015 { 1016 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1017 1018 wait_event(rdev->dev_wait, ({ 1019 int __count; 1020 wiphy_lock(&rdev->wiphy); 1021 __count = rdev->opencount; 1022 wiphy_unlock(&rdev->wiphy); 1023 __count == 0; })); 1024 1025 if (rdev->wiphy.rfkill) 1026 rfkill_unregister(rdev->wiphy.rfkill); 1027 1028 rtnl_lock(); 1029 wiphy_lock(&rdev->wiphy); 1030 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 1031 rdev->wiphy.registered = false; 1032 1033 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 1034 1035 /* 1036 * First remove the hardware from everywhere, this makes 1037 * it impossible to find from userspace. 1038 */ 1039 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 1040 list_del_rcu(&rdev->list); 1041 synchronize_rcu(); 1042 1043 /* 1044 * If this device got a regulatory hint tell core its 1045 * free to listen now to a new shiny device regulatory hint 1046 */ 1047 wiphy_regulatory_deregister(wiphy); 1048 1049 cfg80211_rdev_list_generation++; 1050 device_del(&rdev->wiphy.dev); 1051 1052 wiphy_unlock(&rdev->wiphy); 1053 rtnl_unlock(); 1054 1055 flush_work(&rdev->scan_done_wk); 1056 cancel_work_sync(&rdev->conn_work); 1057 flush_work(&rdev->event_work); 1058 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 1059 cancel_delayed_work_sync(&rdev->background_cac_done_wk); 1060 flush_work(&rdev->destroy_work); 1061 flush_work(&rdev->sched_scan_stop_wk); 1062 flush_work(&rdev->propagate_radar_detect_wk); 1063 flush_work(&rdev->propagate_cac_done_wk); 1064 flush_work(&rdev->mgmt_registrations_update_wk); 1065 flush_work(&rdev->background_cac_abort_wk); 1066 1067 #ifdef CONFIG_PM 1068 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 1069 rdev_set_wakeup(rdev, false); 1070 #endif 1071 cfg80211_rdev_free_wowlan(rdev); 1072 cfg80211_rdev_free_coalesce(rdev); 1073 } 1074 EXPORT_SYMBOL(wiphy_unregister); 1075 1076 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 1077 { 1078 struct cfg80211_internal_bss *scan, *tmp; 1079 struct cfg80211_beacon_registration *reg, *treg; 1080 rfkill_destroy(rdev->wiphy.rfkill); 1081 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 1082 list_del(®->list); 1083 kfree(reg); 1084 } 1085 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 1086 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 1087 mutex_destroy(&rdev->wiphy.mtx); 1088 1089 /* 1090 * The 'regd' can only be non-NULL if we never finished 1091 * initializing the wiphy and thus never went through the 1092 * unregister path - e.g. in failure scenarios. Thus, it 1093 * cannot have been visible to anyone if non-NULL, so we 1094 * can just free it here. 1095 */ 1096 kfree(rcu_dereference_raw(rdev->wiphy.regd)); 1097 1098 kfree(rdev); 1099 } 1100 1101 void wiphy_free(struct wiphy *wiphy) 1102 { 1103 put_device(&wiphy->dev); 1104 } 1105 EXPORT_SYMBOL(wiphy_free); 1106 1107 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked, 1108 enum rfkill_hard_block_reasons reason) 1109 { 1110 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1111 1112 if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason)) 1113 schedule_work(&rdev->rfkill_block); 1114 } 1115 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason); 1116 1117 void cfg80211_cqm_config_free(struct wireless_dev *wdev) 1118 { 1119 kfree(wdev->cqm_config); 1120 wdev->cqm_config = NULL; 1121 } 1122 1123 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev, 1124 bool unregister_netdev) 1125 { 1126 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1127 unsigned int link_id; 1128 1129 ASSERT_RTNL(); 1130 lockdep_assert_held(&rdev->wiphy.mtx); 1131 1132 flush_work(&wdev->pmsr_free_wk); 1133 1134 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 1135 1136 wdev->registered = false; 1137 1138 if (wdev->netdev) { 1139 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211"); 1140 if (unregister_netdev) 1141 unregister_netdevice(wdev->netdev); 1142 } 1143 1144 list_del_rcu(&wdev->list); 1145 synchronize_net(); 1146 rdev->devlist_generation++; 1147 1148 cfg80211_mlme_purge_registrations(wdev); 1149 1150 switch (wdev->iftype) { 1151 case NL80211_IFTYPE_P2P_DEVICE: 1152 cfg80211_stop_p2p_device(rdev, wdev); 1153 break; 1154 case NL80211_IFTYPE_NAN: 1155 cfg80211_stop_nan(rdev, wdev); 1156 break; 1157 default: 1158 break; 1159 } 1160 1161 #ifdef CONFIG_CFG80211_WEXT 1162 kfree_sensitive(wdev->wext.keys); 1163 wdev->wext.keys = NULL; 1164 #endif 1165 /* only initialized if we have a netdev */ 1166 if (wdev->netdev) 1167 flush_work(&wdev->disconnect_wk); 1168 1169 cfg80211_cqm_config_free(wdev); 1170 1171 /* 1172 * Ensure that all events have been processed and 1173 * freed. 1174 */ 1175 cfg80211_process_wdev_events(wdev); 1176 1177 if (wdev->iftype == NL80211_IFTYPE_STATION || 1178 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) { 1179 for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) { 1180 struct cfg80211_internal_bss *curbss; 1181 1182 curbss = wdev->links[link_id].client.current_bss; 1183 1184 if (WARN_ON(curbss)) { 1185 cfg80211_unhold_bss(curbss); 1186 cfg80211_put_bss(wdev->wiphy, &curbss->pub); 1187 wdev->links[link_id].client.current_bss = NULL; 1188 } 1189 } 1190 } 1191 1192 wdev->connected = false; 1193 } 1194 1195 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 1196 { 1197 _cfg80211_unregister_wdev(wdev, true); 1198 } 1199 EXPORT_SYMBOL(cfg80211_unregister_wdev); 1200 1201 static const struct device_type wiphy_type = { 1202 .name = "wlan", 1203 }; 1204 1205 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 1206 enum nl80211_iftype iftype, int num) 1207 { 1208 lockdep_assert_held(&rdev->wiphy.mtx); 1209 1210 rdev->num_running_ifaces += num; 1211 if (iftype == NL80211_IFTYPE_MONITOR) 1212 rdev->num_running_monitor_ifaces += num; 1213 } 1214 1215 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 1216 struct wireless_dev *wdev) 1217 { 1218 struct net_device *dev = wdev->netdev; 1219 struct cfg80211_sched_scan_request *pos, *tmp; 1220 1221 lockdep_assert_held(&rdev->wiphy.mtx); 1222 ASSERT_WDEV_LOCK(wdev); 1223 1224 cfg80211_pmsr_wdev_down(wdev); 1225 1226 cfg80211_stop_background_radar_detection(wdev); 1227 1228 switch (wdev->iftype) { 1229 case NL80211_IFTYPE_ADHOC: 1230 __cfg80211_leave_ibss(rdev, dev, true); 1231 break; 1232 case NL80211_IFTYPE_P2P_CLIENT: 1233 case NL80211_IFTYPE_STATION: 1234 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, 1235 list) { 1236 if (dev == pos->dev) 1237 cfg80211_stop_sched_scan_req(rdev, pos, false); 1238 } 1239 1240 #ifdef CONFIG_CFG80211_WEXT 1241 kfree(wdev->wext.ie); 1242 wdev->wext.ie = NULL; 1243 wdev->wext.ie_len = 0; 1244 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1245 #endif 1246 cfg80211_disconnect(rdev, dev, 1247 WLAN_REASON_DEAUTH_LEAVING, true); 1248 break; 1249 case NL80211_IFTYPE_MESH_POINT: 1250 __cfg80211_leave_mesh(rdev, dev); 1251 break; 1252 case NL80211_IFTYPE_AP: 1253 case NL80211_IFTYPE_P2P_GO: 1254 __cfg80211_stop_ap(rdev, dev, -1, true); 1255 break; 1256 case NL80211_IFTYPE_OCB: 1257 __cfg80211_leave_ocb(rdev, dev); 1258 break; 1259 case NL80211_IFTYPE_P2P_DEVICE: 1260 case NL80211_IFTYPE_NAN: 1261 /* cannot happen, has no netdev */ 1262 break; 1263 case NL80211_IFTYPE_AP_VLAN: 1264 case NL80211_IFTYPE_MONITOR: 1265 /* nothing to do */ 1266 break; 1267 case NL80211_IFTYPE_UNSPECIFIED: 1268 case NL80211_IFTYPE_WDS: 1269 case NUM_NL80211_IFTYPES: 1270 /* invalid */ 1271 break; 1272 } 1273 } 1274 1275 void cfg80211_leave(struct cfg80211_registered_device *rdev, 1276 struct wireless_dev *wdev) 1277 { 1278 wdev_lock(wdev); 1279 __cfg80211_leave(rdev, wdev); 1280 wdev_unlock(wdev); 1281 } 1282 1283 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 1284 gfp_t gfp) 1285 { 1286 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1287 struct cfg80211_event *ev; 1288 unsigned long flags; 1289 1290 trace_cfg80211_stop_iface(wiphy, wdev); 1291 1292 ev = kzalloc(sizeof(*ev), gfp); 1293 if (!ev) 1294 return; 1295 1296 ev->type = EVENT_STOPPED; 1297 1298 spin_lock_irqsave(&wdev->event_lock, flags); 1299 list_add_tail(&ev->list, &wdev->event_list); 1300 spin_unlock_irqrestore(&wdev->event_lock, flags); 1301 queue_work(cfg80211_wq, &rdev->event_work); 1302 } 1303 EXPORT_SYMBOL(cfg80211_stop_iface); 1304 1305 void cfg80211_init_wdev(struct wireless_dev *wdev) 1306 { 1307 mutex_init(&wdev->mtx); 1308 INIT_LIST_HEAD(&wdev->event_list); 1309 spin_lock_init(&wdev->event_lock); 1310 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1311 INIT_LIST_HEAD(&wdev->pmsr_list); 1312 spin_lock_init(&wdev->pmsr_lock); 1313 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk); 1314 1315 #ifdef CONFIG_CFG80211_WEXT 1316 wdev->wext.default_key = -1; 1317 wdev->wext.default_mgmt_key = -1; 1318 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1319 #endif 1320 1321 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1322 wdev->ps = true; 1323 else 1324 wdev->ps = false; 1325 /* allow mac80211 to determine the timeout */ 1326 wdev->ps_timeout = -1; 1327 1328 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1329 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1330 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1331 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE; 1332 1333 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk); 1334 } 1335 1336 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev, 1337 struct wireless_dev *wdev) 1338 { 1339 ASSERT_RTNL(); 1340 lockdep_assert_held(&rdev->wiphy.mtx); 1341 1342 /* 1343 * We get here also when the interface changes network namespaces, 1344 * as it's registered into the new one, but we don't want it to 1345 * change ID in that case. Checking if the ID is already assigned 1346 * works, because 0 isn't considered a valid ID and the memory is 1347 * 0-initialized. 1348 */ 1349 if (!wdev->identifier) 1350 wdev->identifier = ++rdev->wdev_id; 1351 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list); 1352 rdev->devlist_generation++; 1353 wdev->registered = true; 1354 1355 if (wdev->netdev && 1356 sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj, 1357 "phy80211")) 1358 pr_err("failed to add phy80211 symlink to netdev!\n"); 1359 1360 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 1361 } 1362 1363 int cfg80211_register_netdevice(struct net_device *dev) 1364 { 1365 struct wireless_dev *wdev = dev->ieee80211_ptr; 1366 struct cfg80211_registered_device *rdev; 1367 int ret; 1368 1369 ASSERT_RTNL(); 1370 1371 if (WARN_ON(!wdev)) 1372 return -EINVAL; 1373 1374 rdev = wiphy_to_rdev(wdev->wiphy); 1375 1376 lockdep_assert_held(&rdev->wiphy.mtx); 1377 1378 /* we'll take care of this */ 1379 wdev->registered = true; 1380 wdev->registering = true; 1381 ret = register_netdevice(dev); 1382 if (ret) 1383 goto out; 1384 1385 cfg80211_register_wdev(rdev, wdev); 1386 ret = 0; 1387 out: 1388 wdev->registering = false; 1389 if (ret) 1390 wdev->registered = false; 1391 return ret; 1392 } 1393 EXPORT_SYMBOL(cfg80211_register_netdevice); 1394 1395 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 1396 unsigned long state, void *ptr) 1397 { 1398 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1399 struct wireless_dev *wdev = dev->ieee80211_ptr; 1400 struct cfg80211_registered_device *rdev; 1401 struct cfg80211_sched_scan_request *pos, *tmp; 1402 1403 if (!wdev) 1404 return NOTIFY_DONE; 1405 1406 rdev = wiphy_to_rdev(wdev->wiphy); 1407 1408 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 1409 1410 switch (state) { 1411 case NETDEV_POST_INIT: 1412 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 1413 wdev->netdev = dev; 1414 /* can only change netns with wiphy */ 1415 dev->features |= NETIF_F_NETNS_LOCAL; 1416 1417 cfg80211_init_wdev(wdev); 1418 break; 1419 case NETDEV_REGISTER: 1420 if (!wdev->registered) { 1421 wiphy_lock(&rdev->wiphy); 1422 cfg80211_register_wdev(rdev, wdev); 1423 wiphy_unlock(&rdev->wiphy); 1424 } 1425 break; 1426 case NETDEV_UNREGISTER: 1427 /* 1428 * It is possible to get NETDEV_UNREGISTER multiple times, 1429 * so check wdev->registered. 1430 */ 1431 if (wdev->registered && !wdev->registering) { 1432 wiphy_lock(&rdev->wiphy); 1433 _cfg80211_unregister_wdev(wdev, false); 1434 wiphy_unlock(&rdev->wiphy); 1435 } 1436 break; 1437 case NETDEV_GOING_DOWN: 1438 wiphy_lock(&rdev->wiphy); 1439 cfg80211_leave(rdev, wdev); 1440 cfg80211_remove_links(wdev); 1441 wiphy_unlock(&rdev->wiphy); 1442 break; 1443 case NETDEV_DOWN: 1444 wiphy_lock(&rdev->wiphy); 1445 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1446 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1447 if (WARN_ON(!rdev->scan_req->notified && 1448 (!rdev->int_scan_req || 1449 !rdev->int_scan_req->notified))) 1450 rdev->scan_req->info.aborted = true; 1451 ___cfg80211_scan_done(rdev, false); 1452 } 1453 1454 list_for_each_entry_safe(pos, tmp, 1455 &rdev->sched_scan_req_list, list) { 1456 if (WARN_ON(pos->dev == wdev->netdev)) 1457 cfg80211_stop_sched_scan_req(rdev, pos, false); 1458 } 1459 1460 rdev->opencount--; 1461 wiphy_unlock(&rdev->wiphy); 1462 wake_up(&rdev->dev_wait); 1463 break; 1464 case NETDEV_UP: 1465 wiphy_lock(&rdev->wiphy); 1466 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1467 wdev_lock(wdev); 1468 switch (wdev->iftype) { 1469 #ifdef CONFIG_CFG80211_WEXT 1470 case NL80211_IFTYPE_ADHOC: 1471 cfg80211_ibss_wext_join(rdev, wdev); 1472 break; 1473 case NL80211_IFTYPE_STATION: 1474 cfg80211_mgd_wext_connect(rdev, wdev); 1475 break; 1476 #endif 1477 #ifdef CONFIG_MAC80211_MESH 1478 case NL80211_IFTYPE_MESH_POINT: 1479 { 1480 /* backward compat code... */ 1481 struct mesh_setup setup; 1482 memcpy(&setup, &default_mesh_setup, 1483 sizeof(setup)); 1484 /* back compat only needed for mesh_id */ 1485 setup.mesh_id = wdev->u.mesh.id; 1486 setup.mesh_id_len = wdev->u.mesh.id_up_len; 1487 if (wdev->u.mesh.id_up_len) 1488 __cfg80211_join_mesh(rdev, dev, 1489 &setup, 1490 &default_mesh_config); 1491 break; 1492 } 1493 #endif 1494 default: 1495 break; 1496 } 1497 wdev_unlock(wdev); 1498 rdev->opencount++; 1499 1500 /* 1501 * Configure power management to the driver here so that its 1502 * correctly set also after interface type changes etc. 1503 */ 1504 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1505 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1506 rdev->ops->set_power_mgmt && 1507 rdev_set_power_mgmt(rdev, dev, wdev->ps, 1508 wdev->ps_timeout)) { 1509 /* assume this means it's off */ 1510 wdev->ps = false; 1511 } 1512 wiphy_unlock(&rdev->wiphy); 1513 break; 1514 case NETDEV_PRE_UP: 1515 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype, 1516 wdev->use_4addr, 0)) 1517 return notifier_from_errno(-EOPNOTSUPP); 1518 1519 if (rfkill_blocked(rdev->wiphy.rfkill)) 1520 return notifier_from_errno(-ERFKILL); 1521 break; 1522 default: 1523 return NOTIFY_DONE; 1524 } 1525 1526 wireless_nlevent_flush(); 1527 1528 return NOTIFY_OK; 1529 } 1530 1531 static struct notifier_block cfg80211_netdev_notifier = { 1532 .notifier_call = cfg80211_netdev_notifier_call, 1533 }; 1534 1535 static void __net_exit cfg80211_pernet_exit(struct net *net) 1536 { 1537 struct cfg80211_registered_device *rdev; 1538 1539 rtnl_lock(); 1540 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1541 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1542 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1543 } 1544 rtnl_unlock(); 1545 } 1546 1547 static struct pernet_operations cfg80211_pernet_ops = { 1548 .exit = cfg80211_pernet_exit, 1549 }; 1550 1551 static int __init cfg80211_init(void) 1552 { 1553 int err; 1554 1555 err = register_pernet_device(&cfg80211_pernet_ops); 1556 if (err) 1557 goto out_fail_pernet; 1558 1559 err = wiphy_sysfs_init(); 1560 if (err) 1561 goto out_fail_sysfs; 1562 1563 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1564 if (err) 1565 goto out_fail_notifier; 1566 1567 err = nl80211_init(); 1568 if (err) 1569 goto out_fail_nl80211; 1570 1571 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1572 1573 err = regulatory_init(); 1574 if (err) 1575 goto out_fail_reg; 1576 1577 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM); 1578 if (!cfg80211_wq) { 1579 err = -ENOMEM; 1580 goto out_fail_wq; 1581 } 1582 1583 return 0; 1584 1585 out_fail_wq: 1586 regulatory_exit(); 1587 out_fail_reg: 1588 debugfs_remove(ieee80211_debugfs_dir); 1589 nl80211_exit(); 1590 out_fail_nl80211: 1591 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1592 out_fail_notifier: 1593 wiphy_sysfs_exit(); 1594 out_fail_sysfs: 1595 unregister_pernet_device(&cfg80211_pernet_ops); 1596 out_fail_pernet: 1597 return err; 1598 } 1599 fs_initcall(cfg80211_init); 1600 1601 static void __exit cfg80211_exit(void) 1602 { 1603 debugfs_remove(ieee80211_debugfs_dir); 1604 nl80211_exit(); 1605 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1606 wiphy_sysfs_exit(); 1607 regulatory_exit(); 1608 unregister_pernet_device(&cfg80211_pernet_ops); 1609 destroy_workqueue(cfg80211_wq); 1610 } 1611 module_exit(cfg80211_exit); 1612