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) 2018-2024 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 for_each_rdev(rdev) { 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 for_each_rdev(rdev2) 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 lockdep_assert_wiphy(&rdev->wiphy); 133 134 /* Ignore nop renames */ 135 if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0) 136 return 0; 137 138 result = cfg80211_dev_check_name(rdev, newname); 139 if (result < 0) 140 return result; 141 142 result = device_rename(&rdev->wiphy.dev, newname); 143 if (result) 144 return result; 145 146 if (!IS_ERR_OR_NULL(rdev->wiphy.debugfsdir)) 147 debugfs_rename(rdev->wiphy.debugfsdir->d_parent, 148 rdev->wiphy.debugfsdir, 149 rdev->wiphy.debugfsdir->d_parent, newname); 150 151 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 152 153 return 0; 154 } 155 156 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, 157 struct net *net) 158 { 159 struct wireless_dev *wdev; 160 int err = 0; 161 162 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK)) 163 return -EOPNOTSUPP; 164 165 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 166 if (!wdev->netdev) 167 continue; 168 wdev->netdev->netns_local = false; 169 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); 170 if (err) 171 break; 172 wdev->netdev->netns_local = true; 173 } 174 175 if (err) { 176 /* failed -- clean up to old netns */ 177 net = wiphy_net(&rdev->wiphy); 178 179 list_for_each_entry_continue_reverse(wdev, 180 &rdev->wiphy.wdev_list, 181 list) { 182 if (!wdev->netdev) 183 continue; 184 wdev->netdev->netns_local = false; 185 err = dev_change_net_namespace(wdev->netdev, net, 186 "wlan%d"); 187 WARN_ON(err); 188 wdev->netdev->netns_local = true; 189 } 190 191 return err; 192 } 193 194 wiphy_lock(&rdev->wiphy); 195 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 196 if (!wdev->netdev) 197 continue; 198 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 199 } 200 201 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 202 203 wiphy_net_set(&rdev->wiphy, net); 204 205 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev)); 206 WARN_ON(err); 207 208 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 209 210 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 211 if (!wdev->netdev) 212 continue; 213 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 214 } 215 wiphy_unlock(&rdev->wiphy); 216 217 return 0; 218 } 219 220 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data) 221 { 222 struct cfg80211_registered_device *rdev = data; 223 224 wiphy_lock(&rdev->wiphy); 225 rdev_rfkill_poll(rdev); 226 wiphy_unlock(&rdev->wiphy); 227 } 228 229 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev, 230 struct wireless_dev *wdev) 231 { 232 lockdep_assert_held(&rdev->wiphy.mtx); 233 234 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE)) 235 return; 236 237 if (!wdev_running(wdev)) 238 return; 239 240 rdev_stop_p2p_device(rdev, wdev); 241 wdev->is_running = false; 242 243 rdev->opencount--; 244 245 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 246 if (WARN_ON(!rdev->scan_req->notified && 247 (!rdev->int_scan_req || 248 !rdev->int_scan_req->notified))) 249 rdev->scan_req->info.aborted = true; 250 ___cfg80211_scan_done(rdev, false); 251 } 252 } 253 254 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev, 255 struct wireless_dev *wdev) 256 { 257 lockdep_assert_held(&rdev->wiphy.mtx); 258 259 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN)) 260 return; 261 262 if (!wdev_running(wdev)) 263 return; 264 265 rdev_stop_nan(rdev, wdev); 266 wdev->is_running = false; 267 268 rdev->opencount--; 269 } 270 271 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy) 272 { 273 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 274 struct wireless_dev *wdev; 275 276 ASSERT_RTNL(); 277 278 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 279 if (wdev->netdev) { 280 dev_close(wdev->netdev); 281 continue; 282 } 283 284 /* otherwise, check iftype */ 285 286 wiphy_lock(wiphy); 287 288 switch (wdev->iftype) { 289 case NL80211_IFTYPE_P2P_DEVICE: 290 cfg80211_stop_p2p_device(rdev, wdev); 291 break; 292 case NL80211_IFTYPE_NAN: 293 cfg80211_stop_nan(rdev, wdev); 294 break; 295 default: 296 break; 297 } 298 299 wiphy_unlock(wiphy); 300 } 301 } 302 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces); 303 304 static int cfg80211_rfkill_set_block(void *data, bool blocked) 305 { 306 struct cfg80211_registered_device *rdev = data; 307 308 if (!blocked) 309 return 0; 310 311 rtnl_lock(); 312 cfg80211_shutdown_all_interfaces(&rdev->wiphy); 313 rtnl_unlock(); 314 315 return 0; 316 } 317 318 static void cfg80211_rfkill_block_work(struct work_struct *work) 319 { 320 struct cfg80211_registered_device *rdev; 321 322 rdev = container_of(work, struct cfg80211_registered_device, 323 rfkill_block); 324 cfg80211_rfkill_set_block(rdev, true); 325 } 326 327 static void cfg80211_event_work(struct work_struct *work) 328 { 329 struct cfg80211_registered_device *rdev; 330 331 rdev = container_of(work, struct cfg80211_registered_device, 332 event_work); 333 334 wiphy_lock(&rdev->wiphy); 335 cfg80211_process_rdev_events(rdev); 336 wiphy_unlock(&rdev->wiphy); 337 } 338 339 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev) 340 { 341 struct wireless_dev *wdev, *tmp; 342 343 ASSERT_RTNL(); 344 345 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) { 346 if (wdev->nl_owner_dead) { 347 if (wdev->netdev) 348 dev_close(wdev->netdev); 349 350 wiphy_lock(&rdev->wiphy); 351 cfg80211_leave(rdev, wdev); 352 cfg80211_remove_virtual_intf(rdev, wdev); 353 wiphy_unlock(&rdev->wiphy); 354 } 355 } 356 } 357 358 static void cfg80211_destroy_iface_wk(struct work_struct *work) 359 { 360 struct cfg80211_registered_device *rdev; 361 362 rdev = container_of(work, struct cfg80211_registered_device, 363 destroy_work); 364 365 rtnl_lock(); 366 cfg80211_destroy_ifaces(rdev); 367 rtnl_unlock(); 368 } 369 370 static void cfg80211_sched_scan_stop_wk(struct wiphy *wiphy, 371 struct wiphy_work *work) 372 { 373 struct cfg80211_registered_device *rdev; 374 struct cfg80211_sched_scan_request *req, *tmp; 375 376 rdev = container_of(work, struct cfg80211_registered_device, 377 sched_scan_stop_wk); 378 379 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { 380 if (req->nl_owner_dead) 381 cfg80211_stop_sched_scan_req(rdev, req, false); 382 } 383 } 384 385 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work) 386 { 387 struct cfg80211_registered_device *rdev; 388 389 rdev = container_of(work, struct cfg80211_registered_device, 390 propagate_radar_detect_wk); 391 392 rtnl_lock(); 393 394 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef, 395 NL80211_DFS_UNAVAILABLE, 396 NL80211_RADAR_DETECTED); 397 398 rtnl_unlock(); 399 } 400 401 static void cfg80211_propagate_cac_done_wk(struct work_struct *work) 402 { 403 struct cfg80211_registered_device *rdev; 404 405 rdev = container_of(work, struct cfg80211_registered_device, 406 propagate_cac_done_wk); 407 408 rtnl_lock(); 409 410 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef, 411 NL80211_DFS_AVAILABLE, 412 NL80211_RADAR_CAC_FINISHED); 413 414 rtnl_unlock(); 415 } 416 417 static void cfg80211_wiphy_work(struct work_struct *work) 418 { 419 struct cfg80211_registered_device *rdev; 420 struct wiphy_work *wk; 421 422 rdev = container_of(work, struct cfg80211_registered_device, wiphy_work); 423 424 trace_wiphy_work_worker_start(&rdev->wiphy); 425 426 wiphy_lock(&rdev->wiphy); 427 if (rdev->suspended) 428 goto out; 429 430 spin_lock_irq(&rdev->wiphy_work_lock); 431 wk = list_first_entry_or_null(&rdev->wiphy_work_list, 432 struct wiphy_work, entry); 433 if (wk) { 434 list_del_init(&wk->entry); 435 if (!list_empty(&rdev->wiphy_work_list)) 436 queue_work(system_unbound_wq, work); 437 spin_unlock_irq(&rdev->wiphy_work_lock); 438 439 trace_wiphy_work_run(&rdev->wiphy, wk); 440 wk->func(&rdev->wiphy, wk); 441 } else { 442 spin_unlock_irq(&rdev->wiphy_work_lock); 443 } 444 out: 445 wiphy_unlock(&rdev->wiphy); 446 } 447 448 /* exported functions */ 449 450 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, 451 const char *requested_name) 452 { 453 static atomic_t wiphy_counter = ATOMIC_INIT(0); 454 455 struct cfg80211_registered_device *rdev; 456 int alloc_size; 457 458 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 459 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 460 WARN_ON(ops->connect && !ops->disconnect); 461 WARN_ON(ops->join_ibss && !ops->leave_ibss); 462 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 463 WARN_ON(ops->add_station && !ops->del_station); 464 WARN_ON(ops->add_mpath && !ops->del_mpath); 465 WARN_ON(ops->join_mesh && !ops->leave_mesh); 466 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device); 467 WARN_ON(ops->start_ap && !ops->stop_ap); 468 WARN_ON(ops->join_ocb && !ops->leave_ocb); 469 WARN_ON(ops->suspend && !ops->resume); 470 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop); 471 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel); 472 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch); 473 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts); 474 475 alloc_size = sizeof(*rdev) + sizeof_priv; 476 477 rdev = kzalloc(alloc_size, GFP_KERNEL); 478 if (!rdev) 479 return NULL; 480 481 rdev->ops = ops; 482 483 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 484 485 if (unlikely(rdev->wiphy_idx < 0)) { 486 /* ugh, wrapped! */ 487 atomic_dec(&wiphy_counter); 488 kfree(rdev); 489 return NULL; 490 } 491 492 /* atomic_inc_return makes it start at 1, make it start at 0 */ 493 rdev->wiphy_idx--; 494 495 /* give it a proper name */ 496 if (requested_name && requested_name[0]) { 497 int rv; 498 499 rtnl_lock(); 500 rv = cfg80211_dev_check_name(rdev, requested_name); 501 502 if (rv < 0) { 503 rtnl_unlock(); 504 goto use_default_name; 505 } 506 507 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); 508 rtnl_unlock(); 509 if (rv) 510 goto use_default_name; 511 } else { 512 int rv; 513 514 use_default_name: 515 /* NOTE: This is *probably* safe w/out holding rtnl because of 516 * the restrictions on phy names. Probably this call could 517 * fail if some other part of the kernel (re)named a device 518 * phyX. But, might should add some locking and check return 519 * value, and use a different name if this one exists? 520 */ 521 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 522 if (rv < 0) { 523 kfree(rdev); 524 return NULL; 525 } 526 } 527 528 mutex_init(&rdev->wiphy.mtx); 529 INIT_LIST_HEAD(&rdev->wiphy.wdev_list); 530 INIT_LIST_HEAD(&rdev->beacon_registrations); 531 spin_lock_init(&rdev->beacon_registrations_lock); 532 spin_lock_init(&rdev->bss_lock); 533 INIT_LIST_HEAD(&rdev->bss_list); 534 INIT_LIST_HEAD(&rdev->sched_scan_req_list); 535 wiphy_work_init(&rdev->scan_done_wk, __cfg80211_scan_done); 536 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 537 cfg80211_dfs_channels_update_work); 538 #ifdef CONFIG_CFG80211_WEXT 539 rdev->wiphy.wext = &cfg80211_wext_handler; 540 #endif 541 542 device_initialize(&rdev->wiphy.dev); 543 rdev->wiphy.dev.class = &ieee80211_class; 544 rdev->wiphy.dev.platform_data = rdev; 545 device_enable_async_suspend(&rdev->wiphy.dev); 546 547 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 548 wiphy_work_init(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 549 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk); 550 INIT_WORK(&rdev->propagate_radar_detect_wk, 551 cfg80211_propagate_radar_detect_wk); 552 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk); 553 INIT_WORK(&rdev->mgmt_registrations_update_wk, 554 cfg80211_mgmt_registrations_update_wk); 555 spin_lock_init(&rdev->mgmt_registrations_lock); 556 557 #ifdef CONFIG_CFG80211_DEFAULT_PS 558 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 559 #endif 560 561 wiphy_net_set(&rdev->wiphy, &init_net); 562 563 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 564 rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 565 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 566 &rdev->rfkill_ops, rdev); 567 568 if (!rdev->wiphy.rfkill) { 569 wiphy_free(&rdev->wiphy); 570 return NULL; 571 } 572 573 INIT_WORK(&rdev->wiphy_work, cfg80211_wiphy_work); 574 INIT_LIST_HEAD(&rdev->wiphy_work_list); 575 spin_lock_init(&rdev->wiphy_work_lock); 576 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work); 577 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 578 INIT_WORK(&rdev->event_work, cfg80211_event_work); 579 INIT_WORK(&rdev->background_cac_abort_wk, 580 cfg80211_background_cac_abort_wk); 581 INIT_DELAYED_WORK(&rdev->background_cac_done_wk, 582 cfg80211_background_cac_done_wk); 583 584 init_waitqueue_head(&rdev->dev_wait); 585 586 /* 587 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 588 * Fragmentation and RTS threshold are disabled by default with the 589 * special -1 value. 590 */ 591 rdev->wiphy.retry_short = 7; 592 rdev->wiphy.retry_long = 4; 593 rdev->wiphy.frag_threshold = (u32) -1; 594 rdev->wiphy.rts_threshold = (u32) -1; 595 rdev->wiphy.coverage_class = 0; 596 597 rdev->wiphy.max_num_csa_counters = 1; 598 599 rdev->wiphy.max_sched_scan_plans = 1; 600 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 601 602 return &rdev->wiphy; 603 } 604 EXPORT_SYMBOL(wiphy_new_nm); 605 606 static 607 int wiphy_verify_iface_combinations(struct wiphy *wiphy, 608 const struct ieee80211_iface_combination *iface_comb, 609 int n_iface_comb, 610 bool combined_radio) 611 { 612 const struct ieee80211_iface_combination *c; 613 int i, j; 614 615 for (i = 0; i < n_iface_comb; i++) { 616 u32 cnt = 0; 617 u16 all_iftypes = 0; 618 619 c = &iface_comb[i]; 620 621 /* 622 * Combinations with just one interface aren't real, 623 * however we make an exception for DFS. 624 */ 625 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 626 return -EINVAL; 627 628 /* Need at least one channel */ 629 if (WARN_ON(!c->num_different_channels)) 630 return -EINVAL; 631 632 /* DFS only works on one channel. Avoid this check 633 * for multi-radio global combination, since it hold 634 * the capabilities of all radio combinations. 635 */ 636 if (!combined_radio && 637 WARN_ON(c->radar_detect_widths && 638 c->num_different_channels > 1)) 639 return -EINVAL; 640 641 if (WARN_ON(!c->n_limits)) 642 return -EINVAL; 643 644 for (j = 0; j < c->n_limits; j++) { 645 u16 types = c->limits[j].types; 646 647 /* interface types shouldn't overlap */ 648 if (WARN_ON(types & all_iftypes)) 649 return -EINVAL; 650 all_iftypes |= types; 651 652 if (WARN_ON(!c->limits[j].max)) 653 return -EINVAL; 654 655 /* Shouldn't list software iftypes in combinations! */ 656 if (WARN_ON(wiphy->software_iftypes & types)) 657 return -EINVAL; 658 659 /* Only a single P2P_DEVICE can be allowed, avoid this 660 * check for multi-radio global combination, since it 661 * hold the capabilities of all radio combinations. 662 */ 663 if (!combined_radio && 664 WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 665 c->limits[j].max > 1)) 666 return -EINVAL; 667 668 /* Only a single NAN can be allowed, avoid this 669 * check for multi-radio global combination, since it 670 * hold the capabilities of all radio combinations. 671 */ 672 if (!combined_radio && 673 WARN_ON(types & BIT(NL80211_IFTYPE_NAN) && 674 c->limits[j].max > 1)) 675 return -EINVAL; 676 677 /* 678 * This isn't well-defined right now. If you have an 679 * IBSS interface, then its beacon interval may change 680 * by joining other networks, and nothing prevents it 681 * from doing that. 682 * So technically we probably shouldn't even allow AP 683 * and IBSS in the same interface, but it seems that 684 * some drivers support that, possibly only with fixed 685 * beacon intervals for IBSS. 686 */ 687 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) && 688 c->beacon_int_min_gcd)) { 689 return -EINVAL; 690 } 691 692 cnt += c->limits[j].max; 693 /* 694 * Don't advertise an unsupported type 695 * in a combination. 696 */ 697 if (WARN_ON((wiphy->interface_modes & types) != types)) 698 return -EINVAL; 699 } 700 701 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS))) 702 return -EINVAL; 703 704 /* You can't even choose that many! */ 705 if (WARN_ON(cnt < c->max_interfaces)) 706 return -EINVAL; 707 } 708 709 return 0; 710 } 711 712 static int wiphy_verify_combinations(struct wiphy *wiphy) 713 { 714 int i, ret; 715 bool combined_radio = false; 716 717 if (wiphy->n_radio) { 718 for (i = 0; i < wiphy->n_radio; i++) { 719 const struct wiphy_radio *radio = &wiphy->radio[i]; 720 721 ret = wiphy_verify_iface_combinations(wiphy, 722 radio->iface_combinations, 723 radio->n_iface_combinations, 724 false); 725 if (ret) 726 return ret; 727 } 728 729 combined_radio = true; 730 } 731 732 ret = wiphy_verify_iface_combinations(wiphy, 733 wiphy->iface_combinations, 734 wiphy->n_iface_combinations, 735 combined_radio); 736 737 return ret; 738 } 739 740 int wiphy_register(struct wiphy *wiphy) 741 { 742 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 743 int res; 744 enum nl80211_band band; 745 struct ieee80211_supported_band *sband; 746 bool have_band = false; 747 int i; 748 u16 ifmodes = wiphy->interface_modes; 749 750 #ifdef CONFIG_PM 751 if (WARN_ON(wiphy->wowlan && 752 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 753 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 754 return -EINVAL; 755 if (WARN_ON(wiphy->wowlan && 756 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 757 !wiphy->wowlan->tcp)) 758 return -EINVAL; 759 #endif 760 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 761 (!rdev->ops->tdls_channel_switch || 762 !rdev->ops->tdls_cancel_channel_switch))) 763 return -EINVAL; 764 765 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) && 766 (!rdev->ops->start_nan || !rdev->ops->stop_nan || 767 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func || 768 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ))))) 769 return -EINVAL; 770 771 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))) 772 return -EINVAL; 773 774 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported)) 775 return -EINVAL; 776 777 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) { 778 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap && 779 !wiphy->pmsr_capa->ftm.non_asap)) 780 return -EINVAL; 781 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles || 782 !wiphy->pmsr_capa->ftm.bandwidths)) 783 return -EINVAL; 784 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles & 785 ~(BIT(NL80211_PREAMBLE_LEGACY) | 786 BIT(NL80211_PREAMBLE_HT) | 787 BIT(NL80211_PREAMBLE_VHT) | 788 BIT(NL80211_PREAMBLE_HE) | 789 BIT(NL80211_PREAMBLE_DMG)))) 790 return -EINVAL; 791 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based || 792 wiphy->pmsr_capa->ftm.non_trigger_based) && 793 !(wiphy->pmsr_capa->ftm.preambles & 794 BIT(NL80211_PREAMBLE_HE)))) 795 return -EINVAL; 796 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths & 797 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) | 798 BIT(NL80211_CHAN_WIDTH_20) | 799 BIT(NL80211_CHAN_WIDTH_40) | 800 BIT(NL80211_CHAN_WIDTH_80) | 801 BIT(NL80211_CHAN_WIDTH_80P80) | 802 BIT(NL80211_CHAN_WIDTH_160) | 803 BIT(NL80211_CHAN_WIDTH_5) | 804 BIT(NL80211_CHAN_WIDTH_10)))) 805 return -EINVAL; 806 } 807 808 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 809 (wiphy->regulatory_flags & 810 (REGULATORY_CUSTOM_REG | 811 REGULATORY_STRICT_REG | 812 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 813 REGULATORY_COUNTRY_IE_IGNORE)))) 814 return -EINVAL; 815 816 if (WARN_ON(wiphy->coalesce && 817 (!wiphy->coalesce->n_rules || 818 !wiphy->coalesce->n_patterns) && 819 (!wiphy->coalesce->pattern_min_len || 820 wiphy->coalesce->pattern_min_len > 821 wiphy->coalesce->pattern_max_len))) 822 return -EINVAL; 823 824 if (WARN_ON(wiphy->ap_sme_capa && 825 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 826 return -EINVAL; 827 828 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 829 return -EINVAL; 830 831 if (WARN_ON(wiphy->addresses && 832 !is_zero_ether_addr(wiphy->perm_addr) && 833 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 834 ETH_ALEN))) 835 return -EINVAL; 836 837 if (WARN_ON(wiphy->max_acl_mac_addrs && 838 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 839 !rdev->ops->set_mac_acl))) 840 return -EINVAL; 841 842 /* assure only valid behaviours are flagged by driver 843 * hence subtract 2 as bit 0 is invalid. 844 */ 845 if (WARN_ON(wiphy->bss_select_support && 846 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 847 return -EINVAL; 848 849 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy, 850 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) && 851 (!rdev->ops->set_pmk || !rdev->ops->del_pmk))) 852 return -EINVAL; 853 854 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) && 855 rdev->ops->update_connect_params)) 856 return -EINVAL; 857 858 if (wiphy->addresses) 859 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 860 861 /* sanity check ifmodes */ 862 WARN_ON(!ifmodes); 863 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 864 if (WARN_ON(ifmodes != wiphy->interface_modes)) 865 wiphy->interface_modes = ifmodes; 866 867 res = wiphy_verify_combinations(wiphy); 868 if (res) 869 return res; 870 871 /* sanity check supported bands/channels */ 872 for (band = 0; band < NUM_NL80211_BANDS; band++) { 873 const struct ieee80211_sband_iftype_data *iftd; 874 u16 types = 0; 875 bool have_he = false; 876 877 sband = wiphy->bands[band]; 878 if (!sband) 879 continue; 880 881 sband->band = band; 882 if (WARN_ON(!sband->n_channels)) 883 return -EINVAL; 884 /* 885 * on 60GHz or sub-1Ghz band, there are no legacy rates, so 886 * n_bitrates is 0 887 */ 888 if (WARN_ON((band != NL80211_BAND_60GHZ && 889 band != NL80211_BAND_S1GHZ) && 890 !sband->n_bitrates)) 891 return -EINVAL; 892 893 if (WARN_ON(band == NL80211_BAND_6GHZ && 894 (sband->ht_cap.ht_supported || 895 sband->vht_cap.vht_supported))) 896 return -EINVAL; 897 898 /* 899 * Since cfg80211_disable_40mhz_24ghz is global, we can 900 * modify the sband's ht data even if the driver uses a 901 * global structure for that. 902 */ 903 if (cfg80211_disable_40mhz_24ghz && 904 band == NL80211_BAND_2GHZ && 905 sband->ht_cap.ht_supported) { 906 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 907 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 908 } 909 910 /* 911 * Since we use a u32 for rate bitmaps in 912 * ieee80211_get_response_rate, we cannot 913 * have more than 32 legacy rates. 914 */ 915 if (WARN_ON(sband->n_bitrates > 32)) 916 return -EINVAL; 917 918 for (i = 0; i < sband->n_channels; i++) { 919 sband->channels[i].orig_flags = 920 sband->channels[i].flags; 921 sband->channels[i].orig_mag = INT_MAX; 922 sband->channels[i].orig_mpwr = 923 sband->channels[i].max_power; 924 sband->channels[i].band = band; 925 926 if (WARN_ON(sband->channels[i].freq_offset >= 1000)) 927 return -EINVAL; 928 } 929 930 for_each_sband_iftype_data(sband, i, iftd) { 931 bool has_ap, has_non_ap; 932 u32 ap_bits = BIT(NL80211_IFTYPE_AP) | 933 BIT(NL80211_IFTYPE_P2P_GO); 934 935 if (WARN_ON(!iftd->types_mask)) 936 return -EINVAL; 937 if (WARN_ON(types & iftd->types_mask)) 938 return -EINVAL; 939 940 /* at least one piece of information must be present */ 941 if (WARN_ON(!iftd->he_cap.has_he)) 942 return -EINVAL; 943 944 types |= iftd->types_mask; 945 946 if (i == 0) 947 have_he = iftd->he_cap.has_he; 948 else 949 have_he = have_he && 950 iftd->he_cap.has_he; 951 952 has_ap = iftd->types_mask & ap_bits; 953 has_non_ap = iftd->types_mask & ~ap_bits; 954 955 /* 956 * For EHT 20 MHz STA, the capabilities format differs 957 * but to simplify, don't check 20 MHz but rather check 958 * only if AP and non-AP were mentioned at the same time, 959 * reject if so. 960 */ 961 if (WARN_ON(iftd->eht_cap.has_eht && 962 has_ap && has_non_ap)) 963 return -EINVAL; 964 } 965 966 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ)) 967 return -EINVAL; 968 969 have_band = true; 970 } 971 972 if (!have_band) { 973 WARN_ON(1); 974 return -EINVAL; 975 } 976 977 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) { 978 /* 979 * Validate we have a policy (can be explicitly set to 980 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that 981 * we have at least one of doit/dumpit. 982 */ 983 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy)) 984 return -EINVAL; 985 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit && 986 !rdev->wiphy.vendor_commands[i].dumpit)) 987 return -EINVAL; 988 } 989 990 #ifdef CONFIG_PM 991 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 992 (!rdev->wiphy.wowlan->pattern_min_len || 993 rdev->wiphy.wowlan->pattern_min_len > 994 rdev->wiphy.wowlan->pattern_max_len))) 995 return -EINVAL; 996 #endif 997 998 if (!wiphy->max_num_akm_suites) 999 wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES; 1000 else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES || 1001 wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES) 1002 return -EINVAL; 1003 1004 /* check and set up bitrates */ 1005 ieee80211_set_bitrate_flags(wiphy); 1006 1007 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 1008 1009 rtnl_lock(); 1010 wiphy_lock(&rdev->wiphy); 1011 res = device_add(&rdev->wiphy.dev); 1012 if (res) { 1013 wiphy_unlock(&rdev->wiphy); 1014 rtnl_unlock(); 1015 return res; 1016 } 1017 1018 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 1019 cfg80211_rdev_list_generation++; 1020 1021 /* add to debugfs */ 1022 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy), 1023 ieee80211_debugfs_dir); 1024 1025 cfg80211_debugfs_rdev_add(rdev); 1026 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 1027 wiphy_unlock(&rdev->wiphy); 1028 1029 /* set up regulatory info */ 1030 wiphy_regulatory_register(wiphy); 1031 1032 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 1033 struct regulatory_request request; 1034 1035 request.wiphy_idx = get_wiphy_idx(wiphy); 1036 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 1037 request.alpha2[0] = '9'; 1038 request.alpha2[1] = '9'; 1039 1040 nl80211_send_reg_change_event(&request); 1041 } 1042 1043 /* Check that nobody globally advertises any capabilities they do not 1044 * advertise on all possible interface types. 1045 */ 1046 if (wiphy->extended_capabilities_len && 1047 wiphy->num_iftype_ext_capab && 1048 wiphy->iftype_ext_capab) { 1049 u8 supported_on_all, j; 1050 const struct wiphy_iftype_ext_capab *capab; 1051 1052 capab = wiphy->iftype_ext_capab; 1053 for (j = 0; j < wiphy->extended_capabilities_len; j++) { 1054 if (capab[0].extended_capabilities_len > j) 1055 supported_on_all = 1056 capab[0].extended_capabilities[j]; 1057 else 1058 supported_on_all = 0x00; 1059 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) { 1060 if (j >= capab[i].extended_capabilities_len) { 1061 supported_on_all = 0x00; 1062 break; 1063 } 1064 supported_on_all &= 1065 capab[i].extended_capabilities[j]; 1066 } 1067 if (WARN_ON(wiphy->extended_capabilities[j] & 1068 ~supported_on_all)) 1069 break; 1070 } 1071 } 1072 1073 rdev->wiphy.registered = true; 1074 rtnl_unlock(); 1075 1076 res = rfkill_register(rdev->wiphy.rfkill); 1077 if (res) { 1078 rfkill_destroy(rdev->wiphy.rfkill); 1079 rdev->wiphy.rfkill = NULL; 1080 wiphy_unregister(&rdev->wiphy); 1081 return res; 1082 } 1083 1084 return 0; 1085 } 1086 EXPORT_SYMBOL(wiphy_register); 1087 1088 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 1089 { 1090 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1091 1092 if (!rdev->ops->rfkill_poll) 1093 return; 1094 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 1095 rfkill_resume_polling(wiphy->rfkill); 1096 } 1097 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 1098 1099 void cfg80211_process_wiphy_works(struct cfg80211_registered_device *rdev, 1100 struct wiphy_work *end) 1101 { 1102 unsigned int runaway_limit = 100; 1103 unsigned long flags; 1104 1105 lockdep_assert_held(&rdev->wiphy.mtx); 1106 1107 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1108 while (!list_empty(&rdev->wiphy_work_list)) { 1109 struct wiphy_work *wk; 1110 1111 wk = list_first_entry(&rdev->wiphy_work_list, 1112 struct wiphy_work, entry); 1113 list_del_init(&wk->entry); 1114 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1115 1116 trace_wiphy_work_run(&rdev->wiphy, wk); 1117 wk->func(&rdev->wiphy, wk); 1118 1119 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1120 1121 if (wk == end) 1122 break; 1123 1124 if (WARN_ON(--runaway_limit == 0)) 1125 INIT_LIST_HEAD(&rdev->wiphy_work_list); 1126 } 1127 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1128 } 1129 1130 void wiphy_unregister(struct wiphy *wiphy) 1131 { 1132 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1133 1134 wait_event(rdev->dev_wait, ({ 1135 int __count; 1136 wiphy_lock(&rdev->wiphy); 1137 __count = rdev->opencount; 1138 wiphy_unlock(&rdev->wiphy); 1139 __count == 0; })); 1140 1141 if (rdev->wiphy.rfkill) 1142 rfkill_unregister(rdev->wiphy.rfkill); 1143 1144 rtnl_lock(); 1145 wiphy_lock(&rdev->wiphy); 1146 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 1147 rdev->wiphy.registered = false; 1148 1149 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 1150 1151 /* 1152 * First remove the hardware from everywhere, this makes 1153 * it impossible to find from userspace. 1154 */ 1155 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 1156 list_del_rcu(&rdev->list); 1157 synchronize_rcu(); 1158 1159 /* 1160 * If this device got a regulatory hint tell core its 1161 * free to listen now to a new shiny device regulatory hint 1162 */ 1163 wiphy_regulatory_deregister(wiphy); 1164 1165 cfg80211_rdev_list_generation++; 1166 device_del(&rdev->wiphy.dev); 1167 1168 #ifdef CONFIG_PM 1169 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 1170 rdev_set_wakeup(rdev, false); 1171 #endif 1172 1173 /* surely nothing is reachable now, clean up work */ 1174 cfg80211_process_wiphy_works(rdev, NULL); 1175 wiphy_unlock(&rdev->wiphy); 1176 rtnl_unlock(); 1177 1178 /* this has nothing to do now but make sure it's gone */ 1179 cancel_work_sync(&rdev->wiphy_work); 1180 1181 cancel_work_sync(&rdev->conn_work); 1182 flush_work(&rdev->event_work); 1183 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 1184 cancel_delayed_work_sync(&rdev->background_cac_done_wk); 1185 flush_work(&rdev->destroy_work); 1186 flush_work(&rdev->propagate_radar_detect_wk); 1187 flush_work(&rdev->propagate_cac_done_wk); 1188 flush_work(&rdev->mgmt_registrations_update_wk); 1189 flush_work(&rdev->background_cac_abort_wk); 1190 1191 cfg80211_rdev_free_wowlan(rdev); 1192 cfg80211_free_coalesce(rdev->coalesce); 1193 rdev->coalesce = NULL; 1194 } 1195 EXPORT_SYMBOL(wiphy_unregister); 1196 1197 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 1198 { 1199 struct cfg80211_internal_bss *scan, *tmp; 1200 struct cfg80211_beacon_registration *reg, *treg; 1201 rfkill_destroy(rdev->wiphy.rfkill); 1202 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 1203 list_del(®->list); 1204 kfree(reg); 1205 } 1206 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 1207 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 1208 mutex_destroy(&rdev->wiphy.mtx); 1209 1210 /* 1211 * The 'regd' can only be non-NULL if we never finished 1212 * initializing the wiphy and thus never went through the 1213 * unregister path - e.g. in failure scenarios. Thus, it 1214 * cannot have been visible to anyone if non-NULL, so we 1215 * can just free it here. 1216 */ 1217 kfree(rcu_dereference_raw(rdev->wiphy.regd)); 1218 1219 kfree(rdev); 1220 } 1221 1222 void wiphy_free(struct wiphy *wiphy) 1223 { 1224 put_device(&wiphy->dev); 1225 } 1226 EXPORT_SYMBOL(wiphy_free); 1227 1228 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked, 1229 enum rfkill_hard_block_reasons reason) 1230 { 1231 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1232 1233 if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason)) 1234 schedule_work(&rdev->rfkill_block); 1235 } 1236 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason); 1237 1238 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev, 1239 bool unregister_netdev) 1240 { 1241 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1242 struct cfg80211_cqm_config *cqm_config; 1243 unsigned int link_id; 1244 1245 ASSERT_RTNL(); 1246 lockdep_assert_held(&rdev->wiphy.mtx); 1247 1248 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 1249 1250 wdev->registered = false; 1251 1252 if (wdev->netdev) { 1253 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211"); 1254 if (unregister_netdev) 1255 unregister_netdevice(wdev->netdev); 1256 } 1257 1258 list_del_rcu(&wdev->list); 1259 synchronize_net(); 1260 rdev->devlist_generation++; 1261 1262 cfg80211_mlme_purge_registrations(wdev); 1263 1264 switch (wdev->iftype) { 1265 case NL80211_IFTYPE_P2P_DEVICE: 1266 cfg80211_stop_p2p_device(rdev, wdev); 1267 break; 1268 case NL80211_IFTYPE_NAN: 1269 cfg80211_stop_nan(rdev, wdev); 1270 break; 1271 default: 1272 break; 1273 } 1274 1275 #ifdef CONFIG_CFG80211_WEXT 1276 kfree_sensitive(wdev->wext.keys); 1277 wdev->wext.keys = NULL; 1278 #endif 1279 wiphy_work_cancel(wdev->wiphy, &wdev->cqm_rssi_work); 1280 /* deleted from the list, so can't be found from nl80211 any more */ 1281 cqm_config = rcu_access_pointer(wdev->cqm_config); 1282 kfree_rcu(cqm_config, rcu_head); 1283 1284 /* 1285 * Ensure that all events have been processed and 1286 * freed. 1287 */ 1288 cfg80211_process_wdev_events(wdev); 1289 1290 if (wdev->iftype == NL80211_IFTYPE_STATION || 1291 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) { 1292 for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) { 1293 struct cfg80211_internal_bss *curbss; 1294 1295 curbss = wdev->links[link_id].client.current_bss; 1296 1297 if (WARN_ON(curbss)) { 1298 cfg80211_unhold_bss(curbss); 1299 cfg80211_put_bss(wdev->wiphy, &curbss->pub); 1300 wdev->links[link_id].client.current_bss = NULL; 1301 } 1302 } 1303 } 1304 1305 wdev->connected = false; 1306 } 1307 1308 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 1309 { 1310 _cfg80211_unregister_wdev(wdev, true); 1311 } 1312 EXPORT_SYMBOL(cfg80211_unregister_wdev); 1313 1314 static const struct device_type wiphy_type = { 1315 .name = "wlan", 1316 }; 1317 1318 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 1319 enum nl80211_iftype iftype, int num) 1320 { 1321 lockdep_assert_held(&rdev->wiphy.mtx); 1322 1323 rdev->num_running_ifaces += num; 1324 if (iftype == NL80211_IFTYPE_MONITOR) 1325 rdev->num_running_monitor_ifaces += num; 1326 } 1327 1328 void cfg80211_leave(struct cfg80211_registered_device *rdev, 1329 struct wireless_dev *wdev) 1330 { 1331 struct net_device *dev = wdev->netdev; 1332 struct cfg80211_sched_scan_request *pos, *tmp; 1333 1334 lockdep_assert_held(&rdev->wiphy.mtx); 1335 1336 cfg80211_pmsr_wdev_down(wdev); 1337 1338 cfg80211_stop_background_radar_detection(wdev); 1339 1340 switch (wdev->iftype) { 1341 case NL80211_IFTYPE_ADHOC: 1342 cfg80211_leave_ibss(rdev, dev, true); 1343 break; 1344 case NL80211_IFTYPE_P2P_CLIENT: 1345 case NL80211_IFTYPE_STATION: 1346 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, 1347 list) { 1348 if (dev == pos->dev) 1349 cfg80211_stop_sched_scan_req(rdev, pos, false); 1350 } 1351 1352 #ifdef CONFIG_CFG80211_WEXT 1353 kfree(wdev->wext.ie); 1354 wdev->wext.ie = NULL; 1355 wdev->wext.ie_len = 0; 1356 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1357 #endif 1358 cfg80211_disconnect(rdev, dev, 1359 WLAN_REASON_DEAUTH_LEAVING, true); 1360 break; 1361 case NL80211_IFTYPE_MESH_POINT: 1362 cfg80211_leave_mesh(rdev, dev); 1363 break; 1364 case NL80211_IFTYPE_AP: 1365 case NL80211_IFTYPE_P2P_GO: 1366 cfg80211_stop_ap(rdev, dev, -1, true); 1367 break; 1368 case NL80211_IFTYPE_OCB: 1369 cfg80211_leave_ocb(rdev, dev); 1370 break; 1371 case NL80211_IFTYPE_P2P_DEVICE: 1372 case NL80211_IFTYPE_NAN: 1373 /* cannot happen, has no netdev */ 1374 break; 1375 case NL80211_IFTYPE_AP_VLAN: 1376 case NL80211_IFTYPE_MONITOR: 1377 /* nothing to do */ 1378 break; 1379 case NL80211_IFTYPE_UNSPECIFIED: 1380 case NL80211_IFTYPE_WDS: 1381 case NUM_NL80211_IFTYPES: 1382 /* invalid */ 1383 break; 1384 } 1385 } 1386 1387 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 1388 gfp_t gfp) 1389 { 1390 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1391 struct cfg80211_event *ev; 1392 unsigned long flags; 1393 1394 trace_cfg80211_stop_iface(wiphy, wdev); 1395 1396 ev = kzalloc(sizeof(*ev), gfp); 1397 if (!ev) 1398 return; 1399 1400 ev->type = EVENT_STOPPED; 1401 1402 spin_lock_irqsave(&wdev->event_lock, flags); 1403 list_add_tail(&ev->list, &wdev->event_list); 1404 spin_unlock_irqrestore(&wdev->event_lock, flags); 1405 queue_work(cfg80211_wq, &rdev->event_work); 1406 } 1407 EXPORT_SYMBOL(cfg80211_stop_iface); 1408 1409 void cfg80211_init_wdev(struct wireless_dev *wdev) 1410 { 1411 INIT_LIST_HEAD(&wdev->event_list); 1412 spin_lock_init(&wdev->event_lock); 1413 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1414 INIT_LIST_HEAD(&wdev->pmsr_list); 1415 spin_lock_init(&wdev->pmsr_lock); 1416 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk); 1417 1418 #ifdef CONFIG_CFG80211_WEXT 1419 wdev->wext.default_key = -1; 1420 wdev->wext.default_mgmt_key = -1; 1421 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1422 #endif 1423 1424 wiphy_work_init(&wdev->cqm_rssi_work, cfg80211_cqm_rssi_notify_work); 1425 1426 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1427 wdev->ps = true; 1428 else 1429 wdev->ps = false; 1430 /* allow mac80211 to determine the timeout */ 1431 wdev->ps_timeout = -1; 1432 1433 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1434 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1435 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1436 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE; 1437 1438 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk); 1439 } 1440 1441 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev, 1442 struct wireless_dev *wdev) 1443 { 1444 ASSERT_RTNL(); 1445 lockdep_assert_held(&rdev->wiphy.mtx); 1446 1447 /* 1448 * We get here also when the interface changes network namespaces, 1449 * as it's registered into the new one, but we don't want it to 1450 * change ID in that case. Checking if the ID is already assigned 1451 * works, because 0 isn't considered a valid ID and the memory is 1452 * 0-initialized. 1453 */ 1454 if (!wdev->identifier) 1455 wdev->identifier = ++rdev->wdev_id; 1456 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list); 1457 rdev->devlist_generation++; 1458 wdev->registered = true; 1459 1460 if (wdev->netdev && 1461 sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj, 1462 "phy80211")) 1463 pr_err("failed to add phy80211 symlink to netdev!\n"); 1464 1465 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 1466 } 1467 1468 int cfg80211_register_netdevice(struct net_device *dev) 1469 { 1470 struct wireless_dev *wdev = dev->ieee80211_ptr; 1471 struct cfg80211_registered_device *rdev; 1472 int ret; 1473 1474 ASSERT_RTNL(); 1475 1476 if (WARN_ON(!wdev)) 1477 return -EINVAL; 1478 1479 rdev = wiphy_to_rdev(wdev->wiphy); 1480 1481 lockdep_assert_held(&rdev->wiphy.mtx); 1482 1483 /* we'll take care of this */ 1484 wdev->registered = true; 1485 wdev->registering = true; 1486 ret = register_netdevice(dev); 1487 if (ret) 1488 goto out; 1489 1490 cfg80211_register_wdev(rdev, wdev); 1491 ret = 0; 1492 out: 1493 wdev->registering = false; 1494 if (ret) 1495 wdev->registered = false; 1496 return ret; 1497 } 1498 EXPORT_SYMBOL(cfg80211_register_netdevice); 1499 1500 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 1501 unsigned long state, void *ptr) 1502 { 1503 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1504 struct wireless_dev *wdev = dev->ieee80211_ptr; 1505 struct cfg80211_registered_device *rdev; 1506 struct cfg80211_sched_scan_request *pos, *tmp; 1507 1508 if (!wdev) 1509 return NOTIFY_DONE; 1510 1511 rdev = wiphy_to_rdev(wdev->wiphy); 1512 1513 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 1514 1515 switch (state) { 1516 case NETDEV_POST_INIT: 1517 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 1518 wdev->netdev = dev; 1519 /* can only change netns with wiphy */ 1520 dev->netns_local = true; 1521 1522 cfg80211_init_wdev(wdev); 1523 break; 1524 case NETDEV_REGISTER: 1525 if (!wdev->registered) { 1526 wiphy_lock(&rdev->wiphy); 1527 cfg80211_register_wdev(rdev, wdev); 1528 wiphy_unlock(&rdev->wiphy); 1529 } 1530 break; 1531 case NETDEV_UNREGISTER: 1532 /* 1533 * It is possible to get NETDEV_UNREGISTER multiple times, 1534 * so check wdev->registered. 1535 */ 1536 if (wdev->registered && !wdev->registering) { 1537 wiphy_lock(&rdev->wiphy); 1538 _cfg80211_unregister_wdev(wdev, false); 1539 wiphy_unlock(&rdev->wiphy); 1540 } 1541 break; 1542 case NETDEV_GOING_DOWN: 1543 wiphy_lock(&rdev->wiphy); 1544 cfg80211_leave(rdev, wdev); 1545 cfg80211_remove_links(wdev); 1546 wiphy_unlock(&rdev->wiphy); 1547 /* since we just did cfg80211_leave() nothing to do there */ 1548 cancel_work_sync(&wdev->disconnect_wk); 1549 cancel_work_sync(&wdev->pmsr_free_wk); 1550 break; 1551 case NETDEV_DOWN: 1552 wiphy_lock(&rdev->wiphy); 1553 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1554 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1555 if (WARN_ON(!rdev->scan_req->notified && 1556 (!rdev->int_scan_req || 1557 !rdev->int_scan_req->notified))) 1558 rdev->scan_req->info.aborted = true; 1559 ___cfg80211_scan_done(rdev, false); 1560 } 1561 1562 list_for_each_entry_safe(pos, tmp, 1563 &rdev->sched_scan_req_list, list) { 1564 if (WARN_ON(pos->dev == wdev->netdev)) 1565 cfg80211_stop_sched_scan_req(rdev, pos, false); 1566 } 1567 1568 rdev->opencount--; 1569 wiphy_unlock(&rdev->wiphy); 1570 wake_up(&rdev->dev_wait); 1571 break; 1572 case NETDEV_UP: 1573 wiphy_lock(&rdev->wiphy); 1574 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1575 switch (wdev->iftype) { 1576 #ifdef CONFIG_CFG80211_WEXT 1577 case NL80211_IFTYPE_ADHOC: 1578 cfg80211_ibss_wext_join(rdev, wdev); 1579 break; 1580 case NL80211_IFTYPE_STATION: 1581 cfg80211_mgd_wext_connect(rdev, wdev); 1582 break; 1583 #endif 1584 #ifdef CONFIG_MAC80211_MESH 1585 case NL80211_IFTYPE_MESH_POINT: 1586 { 1587 /* backward compat code... */ 1588 struct mesh_setup setup; 1589 memcpy(&setup, &default_mesh_setup, 1590 sizeof(setup)); 1591 /* back compat only needed for mesh_id */ 1592 setup.mesh_id = wdev->u.mesh.id; 1593 setup.mesh_id_len = wdev->u.mesh.id_up_len; 1594 if (wdev->u.mesh.id_up_len) 1595 __cfg80211_join_mesh(rdev, dev, 1596 &setup, 1597 &default_mesh_config); 1598 break; 1599 } 1600 #endif 1601 default: 1602 break; 1603 } 1604 rdev->opencount++; 1605 1606 /* 1607 * Configure power management to the driver here so that its 1608 * correctly set also after interface type changes etc. 1609 */ 1610 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1611 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1612 rdev->ops->set_power_mgmt && 1613 rdev_set_power_mgmt(rdev, dev, wdev->ps, 1614 wdev->ps_timeout)) { 1615 /* assume this means it's off */ 1616 wdev->ps = false; 1617 } 1618 wiphy_unlock(&rdev->wiphy); 1619 break; 1620 case NETDEV_PRE_UP: 1621 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype, 1622 wdev->use_4addr, 0)) 1623 return notifier_from_errno(-EOPNOTSUPP); 1624 1625 if (rfkill_blocked(rdev->wiphy.rfkill)) 1626 return notifier_from_errno(-ERFKILL); 1627 break; 1628 default: 1629 return NOTIFY_DONE; 1630 } 1631 1632 wireless_nlevent_flush(); 1633 1634 return NOTIFY_OK; 1635 } 1636 1637 static struct notifier_block cfg80211_netdev_notifier = { 1638 .notifier_call = cfg80211_netdev_notifier_call, 1639 }; 1640 1641 static void __net_exit cfg80211_pernet_exit(struct net *net) 1642 { 1643 struct cfg80211_registered_device *rdev; 1644 1645 rtnl_lock(); 1646 for_each_rdev(rdev) { 1647 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1648 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1649 } 1650 rtnl_unlock(); 1651 } 1652 1653 static struct pernet_operations cfg80211_pernet_ops = { 1654 .exit = cfg80211_pernet_exit, 1655 }; 1656 1657 void wiphy_work_queue(struct wiphy *wiphy, struct wiphy_work *work) 1658 { 1659 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1660 unsigned long flags; 1661 1662 trace_wiphy_work_queue(wiphy, work); 1663 1664 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1665 if (list_empty(&work->entry)) 1666 list_add_tail(&work->entry, &rdev->wiphy_work_list); 1667 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1668 1669 queue_work(system_unbound_wq, &rdev->wiphy_work); 1670 } 1671 EXPORT_SYMBOL_GPL(wiphy_work_queue); 1672 1673 void wiphy_work_cancel(struct wiphy *wiphy, struct wiphy_work *work) 1674 { 1675 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1676 unsigned long flags; 1677 1678 lockdep_assert_held(&wiphy->mtx); 1679 1680 trace_wiphy_work_cancel(wiphy, work); 1681 1682 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1683 if (!list_empty(&work->entry)) 1684 list_del_init(&work->entry); 1685 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1686 } 1687 EXPORT_SYMBOL_GPL(wiphy_work_cancel); 1688 1689 void wiphy_work_flush(struct wiphy *wiphy, struct wiphy_work *work) 1690 { 1691 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1692 unsigned long flags; 1693 bool run; 1694 1695 trace_wiphy_work_flush(wiphy, work); 1696 1697 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1698 run = !work || !list_empty(&work->entry); 1699 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1700 1701 if (run) 1702 cfg80211_process_wiphy_works(rdev, work); 1703 } 1704 EXPORT_SYMBOL_GPL(wiphy_work_flush); 1705 1706 void wiphy_delayed_work_timer(struct timer_list *t) 1707 { 1708 struct wiphy_delayed_work *dwork = from_timer(dwork, t, timer); 1709 1710 wiphy_work_queue(dwork->wiphy, &dwork->work); 1711 } 1712 EXPORT_SYMBOL(wiphy_delayed_work_timer); 1713 1714 void wiphy_delayed_work_queue(struct wiphy *wiphy, 1715 struct wiphy_delayed_work *dwork, 1716 unsigned long delay) 1717 { 1718 trace_wiphy_delayed_work_queue(wiphy, &dwork->work, delay); 1719 1720 if (!delay) { 1721 del_timer(&dwork->timer); 1722 wiphy_work_queue(wiphy, &dwork->work); 1723 return; 1724 } 1725 1726 dwork->wiphy = wiphy; 1727 mod_timer(&dwork->timer, jiffies + delay); 1728 } 1729 EXPORT_SYMBOL_GPL(wiphy_delayed_work_queue); 1730 1731 void wiphy_delayed_work_cancel(struct wiphy *wiphy, 1732 struct wiphy_delayed_work *dwork) 1733 { 1734 lockdep_assert_held(&wiphy->mtx); 1735 1736 del_timer_sync(&dwork->timer); 1737 wiphy_work_cancel(wiphy, &dwork->work); 1738 } 1739 EXPORT_SYMBOL_GPL(wiphy_delayed_work_cancel); 1740 1741 void wiphy_delayed_work_flush(struct wiphy *wiphy, 1742 struct wiphy_delayed_work *dwork) 1743 { 1744 lockdep_assert_held(&wiphy->mtx); 1745 1746 del_timer_sync(&dwork->timer); 1747 wiphy_work_flush(wiphy, &dwork->work); 1748 } 1749 EXPORT_SYMBOL_GPL(wiphy_delayed_work_flush); 1750 1751 static int __init cfg80211_init(void) 1752 { 1753 int err; 1754 1755 err = register_pernet_device(&cfg80211_pernet_ops); 1756 if (err) 1757 goto out_fail_pernet; 1758 1759 err = wiphy_sysfs_init(); 1760 if (err) 1761 goto out_fail_sysfs; 1762 1763 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1764 if (err) 1765 goto out_fail_notifier; 1766 1767 err = nl80211_init(); 1768 if (err) 1769 goto out_fail_nl80211; 1770 1771 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1772 1773 err = regulatory_init(); 1774 if (err) 1775 goto out_fail_reg; 1776 1777 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM); 1778 if (!cfg80211_wq) { 1779 err = -ENOMEM; 1780 goto out_fail_wq; 1781 } 1782 1783 return 0; 1784 1785 out_fail_wq: 1786 regulatory_exit(); 1787 out_fail_reg: 1788 debugfs_remove(ieee80211_debugfs_dir); 1789 nl80211_exit(); 1790 out_fail_nl80211: 1791 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1792 out_fail_notifier: 1793 wiphy_sysfs_exit(); 1794 out_fail_sysfs: 1795 unregister_pernet_device(&cfg80211_pernet_ops); 1796 out_fail_pernet: 1797 return err; 1798 } 1799 fs_initcall(cfg80211_init); 1800 1801 static void __exit cfg80211_exit(void) 1802 { 1803 debugfs_remove(ieee80211_debugfs_dir); 1804 nl80211_exit(); 1805 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1806 wiphy_sysfs_exit(); 1807 regulatory_exit(); 1808 unregister_pernet_device(&cfg80211_pernet_ops); 1809 destroy_workqueue(cfg80211_wq); 1810 } 1811 module_exit(cfg80211_exit); 1812