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) 2018-2025 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 debugfs_change_name(rdev->wiphy.debugfsdir, "%s", newname); 147 148 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 149 150 return 0; 151 } 152 153 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, 154 struct net *net) 155 { 156 struct wireless_dev *wdev; 157 int err = 0; 158 159 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK)) 160 return -EOPNOTSUPP; 161 162 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 163 if (!wdev->netdev) 164 continue; 165 wdev->netdev->netns_immutable = false; 166 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); 167 if (err) 168 break; 169 wdev->netdev->netns_immutable = true; 170 } 171 172 if (err) { 173 /* failed -- clean up to old netns */ 174 net = wiphy_net(&rdev->wiphy); 175 176 list_for_each_entry_continue_reverse(wdev, 177 &rdev->wiphy.wdev_list, 178 list) { 179 if (!wdev->netdev) 180 continue; 181 wdev->netdev->netns_immutable = false; 182 err = dev_change_net_namespace(wdev->netdev, net, 183 "wlan%d"); 184 WARN_ON(err); 185 wdev->netdev->netns_immutable = true; 186 } 187 188 return err; 189 } 190 191 guard(wiphy)(&rdev->wiphy); 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 } 198 199 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 200 201 wiphy_net_set(&rdev->wiphy, net); 202 203 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev)); 204 WARN_ON(err); 205 206 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 207 208 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 209 if (!wdev->netdev) 210 continue; 211 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 212 } 213 214 return 0; 215 } 216 217 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data) 218 { 219 struct cfg80211_registered_device *rdev = data; 220 221 guard(wiphy)(&rdev->wiphy); 222 223 rdev_rfkill_poll(rdev); 224 } 225 226 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev, 227 struct wireless_dev *wdev) 228 { 229 lockdep_assert_held(&rdev->wiphy.mtx); 230 231 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE)) 232 return; 233 234 if (!wdev_running(wdev)) 235 return; 236 237 rdev_stop_p2p_device(rdev, wdev); 238 wdev->is_running = false; 239 240 rdev->opencount--; 241 242 if (rdev->scan_req && rdev->scan_req->req.wdev == wdev) { 243 if (WARN_ON(!rdev->scan_req->notified && 244 (!rdev->int_scan_req || 245 !rdev->int_scan_req->notified))) 246 rdev->scan_req->info.aborted = true; 247 ___cfg80211_scan_done(rdev, false); 248 } 249 } 250 251 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev, 252 struct wireless_dev *wdev) 253 { 254 lockdep_assert_held(&rdev->wiphy.mtx); 255 256 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN)) 257 return; 258 259 if (!wdev_running(wdev)) 260 return; 261 262 rdev_stop_nan(rdev, wdev); 263 wdev->is_running = false; 264 265 rdev->opencount--; 266 } 267 268 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy) 269 { 270 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 271 struct wireless_dev *wdev; 272 273 ASSERT_RTNL(); 274 275 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 276 if (wdev->netdev) { 277 dev_close(wdev->netdev); 278 continue; 279 } 280 281 /* otherwise, check iftype */ 282 283 guard(wiphy)(wiphy); 284 285 switch (wdev->iftype) { 286 case NL80211_IFTYPE_P2P_DEVICE: 287 cfg80211_stop_p2p_device(rdev, wdev); 288 break; 289 case NL80211_IFTYPE_NAN: 290 cfg80211_stop_nan(rdev, wdev); 291 break; 292 default: 293 break; 294 } 295 } 296 } 297 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces); 298 299 static int cfg80211_rfkill_set_block(void *data, bool blocked) 300 { 301 struct cfg80211_registered_device *rdev = data; 302 303 if (!blocked) 304 return 0; 305 306 rtnl_lock(); 307 cfg80211_shutdown_all_interfaces(&rdev->wiphy); 308 rtnl_unlock(); 309 310 return 0; 311 } 312 313 static void cfg80211_rfkill_block_work(struct work_struct *work) 314 { 315 struct cfg80211_registered_device *rdev; 316 317 rdev = container_of(work, struct cfg80211_registered_device, 318 rfkill_block); 319 cfg80211_rfkill_set_block(rdev, true); 320 } 321 322 static void cfg80211_event_work(struct work_struct *work) 323 { 324 struct cfg80211_registered_device *rdev; 325 326 rdev = container_of(work, struct cfg80211_registered_device, 327 event_work); 328 329 guard(wiphy)(&rdev->wiphy); 330 331 cfg80211_process_rdev_events(rdev); 332 } 333 334 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev) 335 { 336 struct wireless_dev *wdev, *tmp; 337 338 ASSERT_RTNL(); 339 340 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) { 341 if (wdev->nl_owner_dead) { 342 if (wdev->netdev) 343 dev_close(wdev->netdev); 344 345 guard(wiphy)(&rdev->wiphy); 346 347 cfg80211_leave(rdev, wdev); 348 cfg80211_remove_virtual_intf(rdev, wdev); 349 } 350 } 351 } 352 353 static void cfg80211_destroy_iface_wk(struct work_struct *work) 354 { 355 struct cfg80211_registered_device *rdev; 356 357 rdev = container_of(work, struct cfg80211_registered_device, 358 destroy_work); 359 360 rtnl_lock(); 361 cfg80211_destroy_ifaces(rdev); 362 rtnl_unlock(); 363 } 364 365 static void cfg80211_sched_scan_stop_wk(struct wiphy *wiphy, 366 struct wiphy_work *work) 367 { 368 struct cfg80211_registered_device *rdev; 369 struct cfg80211_sched_scan_request *req, *tmp; 370 371 rdev = container_of(work, struct cfg80211_registered_device, 372 sched_scan_stop_wk); 373 374 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { 375 if (req->nl_owner_dead) 376 cfg80211_stop_sched_scan_req(rdev, req, false); 377 } 378 } 379 380 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work) 381 { 382 struct cfg80211_registered_device *rdev; 383 384 rdev = container_of(work, struct cfg80211_registered_device, 385 propagate_radar_detect_wk); 386 387 rtnl_lock(); 388 389 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef, 390 NL80211_DFS_UNAVAILABLE, 391 NL80211_RADAR_DETECTED); 392 393 rtnl_unlock(); 394 } 395 396 static void cfg80211_propagate_cac_done_wk(struct work_struct *work) 397 { 398 struct cfg80211_registered_device *rdev; 399 400 rdev = container_of(work, struct cfg80211_registered_device, 401 propagate_cac_done_wk); 402 403 rtnl_lock(); 404 405 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef, 406 NL80211_DFS_AVAILABLE, 407 NL80211_RADAR_CAC_FINISHED); 408 409 rtnl_unlock(); 410 } 411 412 static void cfg80211_wiphy_work(struct work_struct *work) 413 { 414 struct cfg80211_registered_device *rdev; 415 struct wiphy_work *wk; 416 417 rdev = container_of(work, struct cfg80211_registered_device, wiphy_work); 418 419 trace_wiphy_work_worker_start(&rdev->wiphy); 420 421 guard(wiphy)(&rdev->wiphy); 422 if (rdev->suspended) 423 return; 424 425 spin_lock_irq(&rdev->wiphy_work_lock); 426 wk = list_first_entry_or_null(&rdev->wiphy_work_list, 427 struct wiphy_work, entry); 428 if (wk) { 429 list_del_init(&wk->entry); 430 if (!list_empty(&rdev->wiphy_work_list)) 431 queue_work(system_unbound_wq, work); 432 spin_unlock_irq(&rdev->wiphy_work_lock); 433 434 trace_wiphy_work_run(&rdev->wiphy, wk); 435 wk->func(&rdev->wiphy, wk); 436 } else { 437 spin_unlock_irq(&rdev->wiphy_work_lock); 438 } 439 } 440 441 /* exported functions */ 442 443 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, 444 const char *requested_name) 445 { 446 static atomic_t wiphy_counter = ATOMIC_INIT(0); 447 448 struct cfg80211_registered_device *rdev; 449 int alloc_size; 450 451 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 452 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 453 WARN_ON(ops->connect && !ops->disconnect); 454 WARN_ON(ops->join_ibss && !ops->leave_ibss); 455 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 456 WARN_ON(ops->add_station && !ops->del_station); 457 WARN_ON(ops->add_mpath && !ops->del_mpath); 458 WARN_ON(ops->join_mesh && !ops->leave_mesh); 459 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device); 460 WARN_ON(ops->start_ap && !ops->stop_ap); 461 WARN_ON(ops->join_ocb && !ops->leave_ocb); 462 WARN_ON(ops->suspend && !ops->resume); 463 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop); 464 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel); 465 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch); 466 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts); 467 468 alloc_size = sizeof(*rdev) + sizeof_priv; 469 470 rdev = kzalloc(alloc_size, GFP_KERNEL); 471 if (!rdev) 472 return NULL; 473 474 rdev->ops = ops; 475 476 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 477 478 if (unlikely(rdev->wiphy_idx < 0)) { 479 /* ugh, wrapped! */ 480 atomic_dec(&wiphy_counter); 481 kfree(rdev); 482 return NULL; 483 } 484 485 /* atomic_inc_return makes it start at 1, make it start at 0 */ 486 rdev->wiphy_idx--; 487 488 /* give it a proper name */ 489 if (requested_name && requested_name[0]) { 490 int rv; 491 492 rtnl_lock(); 493 rv = cfg80211_dev_check_name(rdev, requested_name); 494 495 if (rv < 0) { 496 rtnl_unlock(); 497 goto use_default_name; 498 } 499 500 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); 501 rtnl_unlock(); 502 if (rv) 503 goto use_default_name; 504 } else { 505 int rv; 506 507 use_default_name: 508 /* NOTE: This is *probably* safe w/out holding rtnl because of 509 * the restrictions on phy names. Probably this call could 510 * fail if some other part of the kernel (re)named a device 511 * phyX. But, might should add some locking and check return 512 * value, and use a different name if this one exists? 513 */ 514 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 515 if (rv < 0) { 516 kfree(rdev); 517 return NULL; 518 } 519 } 520 521 mutex_init(&rdev->wiphy.mtx); 522 INIT_LIST_HEAD(&rdev->wiphy.wdev_list); 523 INIT_LIST_HEAD(&rdev->beacon_registrations); 524 spin_lock_init(&rdev->beacon_registrations_lock); 525 spin_lock_init(&rdev->bss_lock); 526 INIT_LIST_HEAD(&rdev->bss_list); 527 INIT_LIST_HEAD(&rdev->sched_scan_req_list); 528 wiphy_work_init(&rdev->scan_done_wk, __cfg80211_scan_done); 529 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 530 cfg80211_dfs_channels_update_work); 531 #ifdef CONFIG_CFG80211_WEXT 532 rdev->wiphy.wext = &cfg80211_wext_handler; 533 #endif 534 535 device_initialize(&rdev->wiphy.dev); 536 rdev->wiphy.dev.class = &ieee80211_class; 537 rdev->wiphy.dev.platform_data = rdev; 538 device_enable_async_suspend(&rdev->wiphy.dev); 539 540 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 541 wiphy_work_init(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 542 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk); 543 INIT_WORK(&rdev->propagate_radar_detect_wk, 544 cfg80211_propagate_radar_detect_wk); 545 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk); 546 INIT_WORK(&rdev->mgmt_registrations_update_wk, 547 cfg80211_mgmt_registrations_update_wk); 548 spin_lock_init(&rdev->mgmt_registrations_lock); 549 INIT_WORK(&rdev->wiphy_work, cfg80211_wiphy_work); 550 INIT_LIST_HEAD(&rdev->wiphy_work_list); 551 spin_lock_init(&rdev->wiphy_work_lock); 552 553 #ifdef CONFIG_CFG80211_DEFAULT_PS 554 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 555 #endif 556 557 wiphy_net_set(&rdev->wiphy, &init_net); 558 559 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 560 rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 561 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 562 &rdev->rfkill_ops, rdev); 563 564 if (!rdev->wiphy.rfkill) { 565 wiphy_free(&rdev->wiphy); 566 return NULL; 567 } 568 569 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work); 570 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 571 INIT_WORK(&rdev->event_work, cfg80211_event_work); 572 INIT_WORK(&rdev->background_cac_abort_wk, 573 cfg80211_background_cac_abort_wk); 574 INIT_DELAYED_WORK(&rdev->background_cac_done_wk, 575 cfg80211_background_cac_done_wk); 576 577 init_waitqueue_head(&rdev->dev_wait); 578 579 /* 580 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 581 * Fragmentation and RTS threshold are disabled by default with the 582 * special -1 value. 583 */ 584 rdev->wiphy.retry_short = 7; 585 rdev->wiphy.retry_long = 4; 586 rdev->wiphy.frag_threshold = (u32) -1; 587 rdev->wiphy.rts_threshold = (u32) -1; 588 rdev->wiphy.coverage_class = 0; 589 590 rdev->wiphy.max_num_csa_counters = 1; 591 592 rdev->wiphy.max_sched_scan_plans = 1; 593 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 594 595 return &rdev->wiphy; 596 } 597 EXPORT_SYMBOL(wiphy_new_nm); 598 599 static 600 int wiphy_verify_iface_combinations(struct wiphy *wiphy, 601 const struct ieee80211_iface_combination *iface_comb, 602 int n_iface_comb, 603 bool combined_radio) 604 { 605 const struct ieee80211_iface_combination *c; 606 int i, j; 607 608 for (i = 0; i < n_iface_comb; i++) { 609 u32 cnt = 0; 610 u16 all_iftypes = 0; 611 612 c = &iface_comb[i]; 613 614 /* 615 * Combinations with just one interface aren't real, 616 * however we make an exception for DFS. 617 */ 618 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 619 return -EINVAL; 620 621 /* Need at least one channel */ 622 if (WARN_ON(!c->num_different_channels)) 623 return -EINVAL; 624 625 /* DFS only works on one channel. Avoid this check 626 * for multi-radio global combination, since it hold 627 * the capabilities of all radio combinations. 628 */ 629 if (!combined_radio && 630 WARN_ON(c->radar_detect_widths && 631 c->num_different_channels > 1)) 632 return -EINVAL; 633 634 if (WARN_ON(!c->n_limits)) 635 return -EINVAL; 636 637 for (j = 0; j < c->n_limits; j++) { 638 u16 types = c->limits[j].types; 639 640 /* interface types shouldn't overlap */ 641 if (WARN_ON(types & all_iftypes)) 642 return -EINVAL; 643 all_iftypes |= types; 644 645 if (WARN_ON(!c->limits[j].max)) 646 return -EINVAL; 647 648 /* Shouldn't list software iftypes in combinations! */ 649 if (WARN_ON(wiphy->software_iftypes & types)) 650 return -EINVAL; 651 652 /* Only a single P2P_DEVICE can be allowed, avoid this 653 * check for multi-radio global combination, since it 654 * hold the capabilities of all radio combinations. 655 */ 656 if (!combined_radio && 657 WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 658 c->limits[j].max > 1)) 659 return -EINVAL; 660 661 /* Only a single NAN can be allowed, avoid this 662 * check for multi-radio global combination, since it 663 * hold the capabilities of all radio combinations. 664 */ 665 if (!combined_radio && 666 WARN_ON(types & BIT(NL80211_IFTYPE_NAN) && 667 c->limits[j].max > 1)) 668 return -EINVAL; 669 670 /* 671 * This isn't well-defined right now. If you have an 672 * IBSS interface, then its beacon interval may change 673 * by joining other networks, and nothing prevents it 674 * from doing that. 675 * So technically we probably shouldn't even allow AP 676 * and IBSS in the same interface, but it seems that 677 * some drivers support that, possibly only with fixed 678 * beacon intervals for IBSS. 679 */ 680 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) && 681 c->beacon_int_min_gcd)) { 682 return -EINVAL; 683 } 684 685 cnt += c->limits[j].max; 686 /* 687 * Don't advertise an unsupported type 688 * in a combination. 689 */ 690 if (WARN_ON((wiphy->interface_modes & types) != types)) 691 return -EINVAL; 692 } 693 694 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS))) 695 return -EINVAL; 696 697 /* You can't even choose that many! */ 698 if (WARN_ON(cnt < c->max_interfaces)) 699 return -EINVAL; 700 } 701 702 return 0; 703 } 704 705 static int wiphy_verify_combinations(struct wiphy *wiphy) 706 { 707 int i, ret; 708 bool combined_radio = false; 709 710 if (wiphy->n_radio) { 711 for (i = 0; i < wiphy->n_radio; i++) { 712 const struct wiphy_radio *radio = &wiphy->radio[i]; 713 714 ret = wiphy_verify_iface_combinations(wiphy, 715 radio->iface_combinations, 716 radio->n_iface_combinations, 717 false); 718 if (ret) 719 return ret; 720 } 721 722 combined_radio = true; 723 } 724 725 ret = wiphy_verify_iface_combinations(wiphy, 726 wiphy->iface_combinations, 727 wiphy->n_iface_combinations, 728 combined_radio); 729 730 return ret; 731 } 732 733 int wiphy_register(struct wiphy *wiphy) 734 { 735 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 736 int res; 737 enum nl80211_band band; 738 struct ieee80211_supported_band *sband; 739 bool have_band = false; 740 int i; 741 u16 ifmodes = wiphy->interface_modes; 742 743 #ifdef CONFIG_PM 744 if (WARN_ON(wiphy->wowlan && 745 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 746 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 747 return -EINVAL; 748 if (WARN_ON(wiphy->wowlan && 749 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 750 !wiphy->wowlan->tcp)) 751 return -EINVAL; 752 #endif 753 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 754 (!rdev->ops->tdls_channel_switch || 755 !rdev->ops->tdls_cancel_channel_switch))) 756 return -EINVAL; 757 758 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) && 759 (!rdev->ops->start_nan || !rdev->ops->stop_nan || 760 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func || 761 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ))))) 762 return -EINVAL; 763 764 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))) 765 return -EINVAL; 766 767 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported)) 768 return -EINVAL; 769 770 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) { 771 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap && 772 !wiphy->pmsr_capa->ftm.non_asap)) 773 return -EINVAL; 774 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles || 775 !wiphy->pmsr_capa->ftm.bandwidths)) 776 return -EINVAL; 777 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles & 778 ~(BIT(NL80211_PREAMBLE_LEGACY) | 779 BIT(NL80211_PREAMBLE_HT) | 780 BIT(NL80211_PREAMBLE_VHT) | 781 BIT(NL80211_PREAMBLE_HE) | 782 BIT(NL80211_PREAMBLE_DMG)))) 783 return -EINVAL; 784 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based || 785 wiphy->pmsr_capa->ftm.non_trigger_based) && 786 !(wiphy->pmsr_capa->ftm.preambles & 787 BIT(NL80211_PREAMBLE_HE)))) 788 return -EINVAL; 789 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths & 790 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) | 791 BIT(NL80211_CHAN_WIDTH_20) | 792 BIT(NL80211_CHAN_WIDTH_40) | 793 BIT(NL80211_CHAN_WIDTH_80) | 794 BIT(NL80211_CHAN_WIDTH_80P80) | 795 BIT(NL80211_CHAN_WIDTH_160) | 796 BIT(NL80211_CHAN_WIDTH_320) | 797 BIT(NL80211_CHAN_WIDTH_5) | 798 BIT(NL80211_CHAN_WIDTH_10)))) 799 return -EINVAL; 800 } 801 802 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 803 (wiphy->regulatory_flags & 804 (REGULATORY_CUSTOM_REG | 805 REGULATORY_STRICT_REG | 806 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 807 REGULATORY_COUNTRY_IE_IGNORE)))) 808 return -EINVAL; 809 810 if (WARN_ON(wiphy->coalesce && 811 (!wiphy->coalesce->n_rules || 812 !wiphy->coalesce->n_patterns) && 813 (!wiphy->coalesce->pattern_min_len || 814 wiphy->coalesce->pattern_min_len > 815 wiphy->coalesce->pattern_max_len))) 816 return -EINVAL; 817 818 if (WARN_ON(wiphy->ap_sme_capa && 819 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 820 return -EINVAL; 821 822 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 823 return -EINVAL; 824 825 if (WARN_ON(wiphy->addresses && 826 !is_zero_ether_addr(wiphy->perm_addr) && 827 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 828 ETH_ALEN))) 829 return -EINVAL; 830 831 if (WARN_ON(wiphy->max_acl_mac_addrs && 832 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 833 !rdev->ops->set_mac_acl))) 834 return -EINVAL; 835 836 /* assure only valid behaviours are flagged by driver 837 * hence subtract 2 as bit 0 is invalid. 838 */ 839 if (WARN_ON(wiphy->bss_select_support && 840 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 841 return -EINVAL; 842 843 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy, 844 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) && 845 (!rdev->ops->set_pmk || !rdev->ops->del_pmk))) 846 return -EINVAL; 847 848 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) && 849 rdev->ops->update_connect_params)) 850 return -EINVAL; 851 852 if (wiphy->addresses) 853 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 854 855 /* sanity check ifmodes */ 856 WARN_ON(!ifmodes); 857 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 858 if (WARN_ON(ifmodes != wiphy->interface_modes)) 859 wiphy->interface_modes = ifmodes; 860 861 res = wiphy_verify_combinations(wiphy); 862 if (res) 863 return res; 864 865 /* sanity check supported bands/channels */ 866 for (band = 0; band < NUM_NL80211_BANDS; band++) { 867 const struct ieee80211_sband_iftype_data *iftd; 868 u16 types = 0; 869 bool have_he = false; 870 871 sband = wiphy->bands[band]; 872 if (!sband) 873 continue; 874 875 sband->band = band; 876 if (WARN_ON(!sband->n_channels)) 877 return -EINVAL; 878 /* 879 * on 60GHz or sub-1Ghz band, there are no legacy rates, so 880 * n_bitrates is 0 881 */ 882 if (WARN_ON((band != NL80211_BAND_60GHZ && 883 band != NL80211_BAND_S1GHZ) && 884 !sband->n_bitrates)) 885 return -EINVAL; 886 887 if (WARN_ON(band == NL80211_BAND_6GHZ && 888 (sband->ht_cap.ht_supported || 889 sband->vht_cap.vht_supported))) 890 return -EINVAL; 891 892 /* 893 * Since cfg80211_disable_40mhz_24ghz is global, we can 894 * modify the sband's ht data even if the driver uses a 895 * global structure for that. 896 */ 897 if (cfg80211_disable_40mhz_24ghz && 898 band == NL80211_BAND_2GHZ && 899 sband->ht_cap.ht_supported) { 900 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 901 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 902 } 903 904 /* 905 * Since we use a u32 for rate bitmaps in 906 * ieee80211_get_response_rate, we cannot 907 * have more than 32 legacy rates. 908 */ 909 if (WARN_ON(sband->n_bitrates > 32)) 910 return -EINVAL; 911 912 for (i = 0; i < sband->n_channels; i++) { 913 sband->channels[i].orig_flags = 914 sband->channels[i].flags; 915 sband->channels[i].orig_mag = INT_MAX; 916 sband->channels[i].orig_mpwr = 917 sband->channels[i].max_power; 918 sband->channels[i].band = band; 919 920 if (WARN_ON(sband->channels[i].freq_offset >= 1000)) 921 return -EINVAL; 922 } 923 924 for_each_sband_iftype_data(sband, i, iftd) { 925 bool has_ap, has_non_ap; 926 u32 ap_bits = BIT(NL80211_IFTYPE_AP) | 927 BIT(NL80211_IFTYPE_P2P_GO); 928 929 if (WARN_ON(!iftd->types_mask)) 930 return -EINVAL; 931 if (WARN_ON(types & iftd->types_mask)) 932 return -EINVAL; 933 934 /* at least one piece of information must be present */ 935 if (WARN_ON(!iftd->he_cap.has_he)) 936 return -EINVAL; 937 938 types |= iftd->types_mask; 939 940 if (i == 0) 941 have_he = iftd->he_cap.has_he; 942 else 943 have_he = have_he && 944 iftd->he_cap.has_he; 945 946 has_ap = iftd->types_mask & ap_bits; 947 has_non_ap = iftd->types_mask & ~ap_bits; 948 949 /* 950 * For EHT 20 MHz STA, the capabilities format differs 951 * but to simplify, don't check 20 MHz but rather check 952 * only if AP and non-AP were mentioned at the same time, 953 * reject if so. 954 */ 955 if (WARN_ON(iftd->eht_cap.has_eht && 956 has_ap && has_non_ap)) 957 return -EINVAL; 958 } 959 960 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ)) 961 return -EINVAL; 962 963 have_band = true; 964 } 965 966 if (!have_band) { 967 WARN_ON(1); 968 return -EINVAL; 969 } 970 971 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) { 972 /* 973 * Validate we have a policy (can be explicitly set to 974 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that 975 * we have at least one of doit/dumpit. 976 */ 977 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy)) 978 return -EINVAL; 979 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit && 980 !rdev->wiphy.vendor_commands[i].dumpit)) 981 return -EINVAL; 982 } 983 984 #ifdef CONFIG_PM 985 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 986 (!rdev->wiphy.wowlan->pattern_min_len || 987 rdev->wiphy.wowlan->pattern_min_len > 988 rdev->wiphy.wowlan->pattern_max_len))) 989 return -EINVAL; 990 #endif 991 992 if (!wiphy->max_num_akm_suites) 993 wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES; 994 else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES || 995 wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES) 996 return -EINVAL; 997 998 /* Allocate radio configuration space for multi-radio wiphy */ 999 if (wiphy->n_radio > 0) { 1000 int idx; 1001 1002 wiphy->radio_cfg = kcalloc(wiphy->n_radio, 1003 sizeof(*wiphy->radio_cfg), 1004 GFP_KERNEL); 1005 if (!wiphy->radio_cfg) 1006 return -ENOMEM; 1007 /* 1008 * Initialize wiphy radio parameters to IEEE 802.11 1009 * MIB default values. RTS threshold is disabled by 1010 * default with the special -1 value. 1011 */ 1012 for (idx = 0; idx < wiphy->n_radio; idx++) 1013 wiphy->radio_cfg[idx].rts_threshold = (u32)-1; 1014 } 1015 1016 /* check and set up bitrates */ 1017 ieee80211_set_bitrate_flags(wiphy); 1018 1019 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 1020 1021 if (rdev->wiphy.bss_param_support & WIPHY_BSS_PARAM_P2P_CTWINDOW) 1022 rdev->wiphy.features |= NL80211_FEATURE_P2P_GO_CTWIN; 1023 else if (rdev->wiphy.features & NL80211_FEATURE_P2P_GO_CTWIN) 1024 rdev->wiphy.bss_param_support |= WIPHY_BSS_PARAM_P2P_CTWINDOW; 1025 if (rdev->wiphy.bss_param_support & WIPHY_BSS_PARAM_P2P_OPPPS) 1026 rdev->wiphy.features |= NL80211_FEATURE_P2P_GO_OPPPS; 1027 else if (rdev->wiphy.features & NL80211_FEATURE_P2P_GO_OPPPS) 1028 rdev->wiphy.bss_param_support |= WIPHY_BSS_PARAM_P2P_OPPPS; 1029 1030 rtnl_lock(); 1031 wiphy_lock(&rdev->wiphy); 1032 res = device_add(&rdev->wiphy.dev); 1033 if (res) { 1034 wiphy_unlock(&rdev->wiphy); 1035 rtnl_unlock(); 1036 return res; 1037 } 1038 1039 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 1040 cfg80211_rdev_list_generation++; 1041 1042 /* add to debugfs */ 1043 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy), 1044 ieee80211_debugfs_dir); 1045 1046 cfg80211_debugfs_rdev_add(rdev); 1047 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 1048 wiphy_unlock(&rdev->wiphy); 1049 1050 /* set up regulatory info */ 1051 wiphy_regulatory_register(wiphy); 1052 1053 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 1054 struct regulatory_request request; 1055 1056 request.wiphy_idx = get_wiphy_idx(wiphy); 1057 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 1058 request.alpha2[0] = '9'; 1059 request.alpha2[1] = '9'; 1060 1061 nl80211_send_reg_change_event(&request); 1062 } 1063 1064 /* Check that nobody globally advertises any capabilities they do not 1065 * advertise on all possible interface types. 1066 */ 1067 if (wiphy->extended_capabilities_len && 1068 wiphy->num_iftype_ext_capab && 1069 wiphy->iftype_ext_capab) { 1070 u8 supported_on_all, j; 1071 const struct wiphy_iftype_ext_capab *capab; 1072 1073 capab = wiphy->iftype_ext_capab; 1074 for (j = 0; j < wiphy->extended_capabilities_len; j++) { 1075 if (capab[0].extended_capabilities_len > j) 1076 supported_on_all = 1077 capab[0].extended_capabilities[j]; 1078 else 1079 supported_on_all = 0x00; 1080 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) { 1081 if (j >= capab[i].extended_capabilities_len) { 1082 supported_on_all = 0x00; 1083 break; 1084 } 1085 supported_on_all &= 1086 capab[i].extended_capabilities[j]; 1087 } 1088 if (WARN_ON(wiphy->extended_capabilities[j] & 1089 ~supported_on_all)) 1090 break; 1091 } 1092 } 1093 1094 rdev->wiphy.registered = true; 1095 rtnl_unlock(); 1096 1097 res = rfkill_register(rdev->wiphy.rfkill); 1098 if (res) { 1099 rfkill_destroy(rdev->wiphy.rfkill); 1100 rdev->wiphy.rfkill = NULL; 1101 wiphy_unregister(&rdev->wiphy); 1102 return res; 1103 } 1104 1105 return 0; 1106 } 1107 EXPORT_SYMBOL(wiphy_register); 1108 1109 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 1110 { 1111 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1112 1113 if (!rdev->ops->rfkill_poll) 1114 return; 1115 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 1116 rfkill_resume_polling(wiphy->rfkill); 1117 } 1118 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 1119 1120 void cfg80211_process_wiphy_works(struct cfg80211_registered_device *rdev, 1121 struct wiphy_work *end) 1122 { 1123 unsigned int runaway_limit = 100; 1124 unsigned long flags; 1125 1126 lockdep_assert_held(&rdev->wiphy.mtx); 1127 1128 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1129 while (!list_empty(&rdev->wiphy_work_list)) { 1130 struct wiphy_work *wk; 1131 1132 wk = list_first_entry(&rdev->wiphy_work_list, 1133 struct wiphy_work, entry); 1134 list_del_init(&wk->entry); 1135 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1136 1137 trace_wiphy_work_run(&rdev->wiphy, wk); 1138 wk->func(&rdev->wiphy, wk); 1139 1140 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1141 1142 if (wk == end) 1143 break; 1144 1145 if (WARN_ON(--runaway_limit == 0)) 1146 INIT_LIST_HEAD(&rdev->wiphy_work_list); 1147 } 1148 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1149 } 1150 1151 void wiphy_unregister(struct wiphy *wiphy) 1152 { 1153 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1154 1155 wait_event(rdev->dev_wait, ({ 1156 int __count; 1157 wiphy_lock(&rdev->wiphy); 1158 __count = rdev->opencount; 1159 wiphy_unlock(&rdev->wiphy); 1160 __count == 0; })); 1161 1162 if (rdev->wiphy.rfkill) 1163 rfkill_unregister(rdev->wiphy.rfkill); 1164 1165 rtnl_lock(); 1166 wiphy_lock(&rdev->wiphy); 1167 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 1168 rdev->wiphy.registered = false; 1169 1170 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 1171 1172 /* 1173 * First remove the hardware from everywhere, this makes 1174 * it impossible to find from userspace. 1175 */ 1176 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 1177 list_del_rcu(&rdev->list); 1178 synchronize_rcu(); 1179 1180 /* 1181 * If this device got a regulatory hint tell core its 1182 * free to listen now to a new shiny device regulatory hint 1183 */ 1184 wiphy_regulatory_deregister(wiphy); 1185 1186 cfg80211_rdev_list_generation++; 1187 device_del(&rdev->wiphy.dev); 1188 1189 #ifdef CONFIG_PM 1190 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 1191 rdev_set_wakeup(rdev, false); 1192 #endif 1193 1194 /* surely nothing is reachable now, clean up work */ 1195 cfg80211_process_wiphy_works(rdev, NULL); 1196 wiphy_unlock(&rdev->wiphy); 1197 rtnl_unlock(); 1198 1199 /* this has nothing to do now but make sure it's gone */ 1200 cancel_work_sync(&rdev->wiphy_work); 1201 1202 cancel_work_sync(&rdev->conn_work); 1203 flush_work(&rdev->event_work); 1204 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 1205 cancel_delayed_work_sync(&rdev->background_cac_done_wk); 1206 flush_work(&rdev->destroy_work); 1207 flush_work(&rdev->propagate_radar_detect_wk); 1208 flush_work(&rdev->propagate_cac_done_wk); 1209 flush_work(&rdev->mgmt_registrations_update_wk); 1210 flush_work(&rdev->background_cac_abort_wk); 1211 1212 cfg80211_rdev_free_wowlan(rdev); 1213 cfg80211_free_coalesce(rdev->coalesce); 1214 rdev->coalesce = NULL; 1215 } 1216 EXPORT_SYMBOL(wiphy_unregister); 1217 1218 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 1219 { 1220 struct cfg80211_internal_bss *scan, *tmp; 1221 struct cfg80211_beacon_registration *reg, *treg; 1222 unsigned long flags; 1223 1224 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1225 WARN_ON(!list_empty(&rdev->wiphy_work_list)); 1226 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1227 cancel_work_sync(&rdev->wiphy_work); 1228 1229 rfkill_destroy(rdev->wiphy.rfkill); 1230 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 1231 list_del(®->list); 1232 kfree(reg); 1233 } 1234 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 1235 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 1236 mutex_destroy(&rdev->wiphy.mtx); 1237 1238 /* 1239 * The 'regd' can only be non-NULL if we never finished 1240 * initializing the wiphy and thus never went through the 1241 * unregister path - e.g. in failure scenarios. Thus, it 1242 * cannot have been visible to anyone if non-NULL, so we 1243 * can just free it here. 1244 */ 1245 kfree(rcu_dereference_raw(rdev->wiphy.regd)); 1246 1247 kfree(rdev); 1248 } 1249 1250 void wiphy_free(struct wiphy *wiphy) 1251 { 1252 kfree(wiphy->radio_cfg); 1253 put_device(&wiphy->dev); 1254 } 1255 EXPORT_SYMBOL(wiphy_free); 1256 1257 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked, 1258 enum rfkill_hard_block_reasons reason) 1259 { 1260 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1261 1262 if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason)) 1263 schedule_work(&rdev->rfkill_block); 1264 } 1265 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason); 1266 1267 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev, 1268 bool unregister_netdev) 1269 { 1270 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1271 struct cfg80211_cqm_config *cqm_config; 1272 unsigned int link_id; 1273 1274 ASSERT_RTNL(); 1275 lockdep_assert_held(&rdev->wiphy.mtx); 1276 1277 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 1278 1279 wdev->registered = false; 1280 1281 if (wdev->netdev) { 1282 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211"); 1283 if (unregister_netdev) 1284 unregister_netdevice(wdev->netdev); 1285 } 1286 1287 list_del_rcu(&wdev->list); 1288 synchronize_net(); 1289 rdev->devlist_generation++; 1290 1291 cfg80211_mlme_purge_registrations(wdev); 1292 1293 switch (wdev->iftype) { 1294 case NL80211_IFTYPE_P2P_DEVICE: 1295 cfg80211_stop_p2p_device(rdev, wdev); 1296 break; 1297 case NL80211_IFTYPE_NAN: 1298 cfg80211_stop_nan(rdev, wdev); 1299 break; 1300 default: 1301 break; 1302 } 1303 1304 #ifdef CONFIG_CFG80211_WEXT 1305 kfree_sensitive(wdev->wext.keys); 1306 wdev->wext.keys = NULL; 1307 #endif 1308 wiphy_work_cancel(wdev->wiphy, &wdev->cqm_rssi_work); 1309 /* deleted from the list, so can't be found from nl80211 any more */ 1310 cqm_config = rcu_access_pointer(wdev->cqm_config); 1311 kfree_rcu(cqm_config, rcu_head); 1312 RCU_INIT_POINTER(wdev->cqm_config, NULL); 1313 1314 /* 1315 * Ensure that all events have been processed and 1316 * freed. 1317 */ 1318 cfg80211_process_wdev_events(wdev); 1319 1320 if (wdev->iftype == NL80211_IFTYPE_STATION || 1321 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) { 1322 for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) { 1323 struct cfg80211_internal_bss *curbss; 1324 1325 curbss = wdev->links[link_id].client.current_bss; 1326 1327 if (WARN_ON(curbss)) { 1328 cfg80211_unhold_bss(curbss); 1329 cfg80211_put_bss(wdev->wiphy, &curbss->pub); 1330 wdev->links[link_id].client.current_bss = NULL; 1331 } 1332 } 1333 } 1334 1335 wdev->connected = false; 1336 } 1337 1338 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 1339 { 1340 _cfg80211_unregister_wdev(wdev, true); 1341 } 1342 EXPORT_SYMBOL(cfg80211_unregister_wdev); 1343 1344 static const struct device_type wiphy_type = { 1345 .name = "wlan", 1346 }; 1347 1348 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 1349 enum nl80211_iftype iftype, int num) 1350 { 1351 lockdep_assert_held(&rdev->wiphy.mtx); 1352 1353 rdev->num_running_ifaces += num; 1354 if (iftype == NL80211_IFTYPE_MONITOR) 1355 rdev->num_running_monitor_ifaces += num; 1356 } 1357 1358 void cfg80211_leave(struct cfg80211_registered_device *rdev, 1359 struct wireless_dev *wdev) 1360 { 1361 struct net_device *dev = wdev->netdev; 1362 struct cfg80211_sched_scan_request *pos, *tmp; 1363 1364 lockdep_assert_held(&rdev->wiphy.mtx); 1365 1366 cfg80211_pmsr_wdev_down(wdev); 1367 1368 cfg80211_stop_background_radar_detection(wdev); 1369 1370 switch (wdev->iftype) { 1371 case NL80211_IFTYPE_ADHOC: 1372 cfg80211_leave_ibss(rdev, dev, true); 1373 break; 1374 case NL80211_IFTYPE_P2P_CLIENT: 1375 case NL80211_IFTYPE_STATION: 1376 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, 1377 list) { 1378 if (dev == pos->dev) 1379 cfg80211_stop_sched_scan_req(rdev, pos, false); 1380 } 1381 1382 #ifdef CONFIG_CFG80211_WEXT 1383 kfree(wdev->wext.ie); 1384 wdev->wext.ie = NULL; 1385 wdev->wext.ie_len = 0; 1386 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1387 #endif 1388 cfg80211_disconnect(rdev, dev, 1389 WLAN_REASON_DEAUTH_LEAVING, true); 1390 break; 1391 case NL80211_IFTYPE_MESH_POINT: 1392 cfg80211_leave_mesh(rdev, dev); 1393 break; 1394 case NL80211_IFTYPE_AP: 1395 case NL80211_IFTYPE_P2P_GO: 1396 cfg80211_stop_ap(rdev, dev, -1, true); 1397 break; 1398 case NL80211_IFTYPE_OCB: 1399 cfg80211_leave_ocb(rdev, dev); 1400 break; 1401 case NL80211_IFTYPE_P2P_DEVICE: 1402 case NL80211_IFTYPE_NAN: 1403 /* cannot happen, has no netdev */ 1404 break; 1405 case NL80211_IFTYPE_AP_VLAN: 1406 case NL80211_IFTYPE_MONITOR: 1407 /* nothing to do */ 1408 break; 1409 case NL80211_IFTYPE_UNSPECIFIED: 1410 case NL80211_IFTYPE_WDS: 1411 case NUM_NL80211_IFTYPES: 1412 /* invalid */ 1413 break; 1414 } 1415 } 1416 1417 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 1418 gfp_t gfp) 1419 { 1420 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1421 struct cfg80211_event *ev; 1422 unsigned long flags; 1423 1424 trace_cfg80211_stop_iface(wiphy, wdev); 1425 1426 ev = kzalloc(sizeof(*ev), gfp); 1427 if (!ev) 1428 return; 1429 1430 ev->type = EVENT_STOPPED; 1431 1432 spin_lock_irqsave(&wdev->event_lock, flags); 1433 list_add_tail(&ev->list, &wdev->event_list); 1434 spin_unlock_irqrestore(&wdev->event_lock, flags); 1435 queue_work(cfg80211_wq, &rdev->event_work); 1436 } 1437 EXPORT_SYMBOL(cfg80211_stop_iface); 1438 1439 void cfg80211_init_wdev(struct wireless_dev *wdev) 1440 { 1441 INIT_LIST_HEAD(&wdev->event_list); 1442 spin_lock_init(&wdev->event_lock); 1443 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1444 INIT_LIST_HEAD(&wdev->pmsr_list); 1445 spin_lock_init(&wdev->pmsr_lock); 1446 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk); 1447 1448 #ifdef CONFIG_CFG80211_WEXT 1449 wdev->wext.default_key = -1; 1450 wdev->wext.default_mgmt_key = -1; 1451 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1452 #endif 1453 1454 wiphy_work_init(&wdev->cqm_rssi_work, cfg80211_cqm_rssi_notify_work); 1455 1456 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1457 wdev->ps = true; 1458 else 1459 wdev->ps = false; 1460 /* allow mac80211 to determine the timeout */ 1461 wdev->ps_timeout = -1; 1462 1463 wdev->radio_mask = BIT(wdev->wiphy->n_radio) - 1; 1464 1465 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1466 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1467 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1468 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE; 1469 1470 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk); 1471 } 1472 1473 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev, 1474 struct wireless_dev *wdev) 1475 { 1476 ASSERT_RTNL(); 1477 lockdep_assert_held(&rdev->wiphy.mtx); 1478 1479 /* 1480 * We get here also when the interface changes network namespaces, 1481 * as it's registered into the new one, but we don't want it to 1482 * change ID in that case. Checking if the ID is already assigned 1483 * works, because 0 isn't considered a valid ID and the memory is 1484 * 0-initialized. 1485 */ 1486 if (!wdev->identifier) 1487 wdev->identifier = ++rdev->wdev_id; 1488 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list); 1489 rdev->devlist_generation++; 1490 wdev->registered = true; 1491 1492 if (wdev->netdev && 1493 sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj, 1494 "phy80211")) 1495 pr_err("failed to add phy80211 symlink to netdev!\n"); 1496 1497 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 1498 } 1499 1500 int cfg80211_register_netdevice(struct net_device *dev) 1501 { 1502 struct wireless_dev *wdev = dev->ieee80211_ptr; 1503 struct cfg80211_registered_device *rdev; 1504 int ret; 1505 1506 ASSERT_RTNL(); 1507 1508 if (WARN_ON(!wdev)) 1509 return -EINVAL; 1510 1511 rdev = wiphy_to_rdev(wdev->wiphy); 1512 1513 lockdep_assert_held(&rdev->wiphy.mtx); 1514 1515 /* we'll take care of this */ 1516 wdev->registered = true; 1517 wdev->registering = true; 1518 ret = register_netdevice(dev); 1519 if (ret) 1520 goto out; 1521 1522 cfg80211_register_wdev(rdev, wdev); 1523 ret = 0; 1524 out: 1525 wdev->registering = false; 1526 if (ret) 1527 wdev->registered = false; 1528 return ret; 1529 } 1530 EXPORT_SYMBOL(cfg80211_register_netdevice); 1531 1532 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 1533 unsigned long state, void *ptr) 1534 { 1535 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1536 struct wireless_dev *wdev = dev->ieee80211_ptr; 1537 struct cfg80211_registered_device *rdev; 1538 struct cfg80211_sched_scan_request *pos, *tmp; 1539 1540 if (!wdev) 1541 return NOTIFY_DONE; 1542 1543 rdev = wiphy_to_rdev(wdev->wiphy); 1544 1545 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 1546 1547 switch (state) { 1548 case NETDEV_POST_INIT: 1549 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 1550 wdev->netdev = dev; 1551 /* can only change netns with wiphy */ 1552 dev->netns_immutable = true; 1553 1554 cfg80211_init_wdev(wdev); 1555 break; 1556 case NETDEV_REGISTER: 1557 if (!wdev->registered) { 1558 guard(wiphy)(&rdev->wiphy); 1559 1560 cfg80211_register_wdev(rdev, wdev); 1561 } 1562 break; 1563 case NETDEV_UNREGISTER: 1564 /* 1565 * It is possible to get NETDEV_UNREGISTER multiple times, 1566 * so check wdev->registered. 1567 */ 1568 if (wdev->registered && !wdev->registering) { 1569 guard(wiphy)(&rdev->wiphy); 1570 1571 _cfg80211_unregister_wdev(wdev, false); 1572 } 1573 break; 1574 case NETDEV_GOING_DOWN: 1575 scoped_guard(wiphy, &rdev->wiphy) { 1576 cfg80211_leave(rdev, wdev); 1577 cfg80211_remove_links(wdev); 1578 } 1579 /* since we just did cfg80211_leave() nothing to do there */ 1580 cancel_work_sync(&wdev->disconnect_wk); 1581 cancel_work_sync(&wdev->pmsr_free_wk); 1582 break; 1583 case NETDEV_DOWN: 1584 wiphy_lock(&rdev->wiphy); 1585 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1586 if (rdev->scan_req && rdev->scan_req->req.wdev == wdev) { 1587 if (WARN_ON(!rdev->scan_req->notified && 1588 (!rdev->int_scan_req || 1589 !rdev->int_scan_req->notified))) 1590 rdev->scan_req->info.aborted = true; 1591 ___cfg80211_scan_done(rdev, false); 1592 } 1593 1594 list_for_each_entry_safe(pos, tmp, 1595 &rdev->sched_scan_req_list, list) { 1596 if (WARN_ON(pos->dev == wdev->netdev)) 1597 cfg80211_stop_sched_scan_req(rdev, pos, false); 1598 } 1599 1600 rdev->opencount--; 1601 wiphy_unlock(&rdev->wiphy); 1602 wake_up(&rdev->dev_wait); 1603 break; 1604 case NETDEV_UP: 1605 wiphy_lock(&rdev->wiphy); 1606 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1607 switch (wdev->iftype) { 1608 #ifdef CONFIG_CFG80211_WEXT 1609 case NL80211_IFTYPE_ADHOC: 1610 cfg80211_ibss_wext_join(rdev, wdev); 1611 break; 1612 case NL80211_IFTYPE_STATION: 1613 cfg80211_mgd_wext_connect(rdev, wdev); 1614 break; 1615 #endif 1616 #ifdef CONFIG_MAC80211_MESH 1617 case NL80211_IFTYPE_MESH_POINT: 1618 { 1619 /* backward compat code... */ 1620 struct mesh_setup setup; 1621 memcpy(&setup, &default_mesh_setup, 1622 sizeof(setup)); 1623 /* back compat only needed for mesh_id */ 1624 setup.mesh_id = wdev->u.mesh.id; 1625 setup.mesh_id_len = wdev->u.mesh.id_up_len; 1626 if (wdev->u.mesh.id_up_len) 1627 __cfg80211_join_mesh(rdev, dev, 1628 &setup, 1629 &default_mesh_config); 1630 break; 1631 } 1632 #endif 1633 default: 1634 break; 1635 } 1636 rdev->opencount++; 1637 1638 /* 1639 * Configure power management to the driver here so that its 1640 * correctly set also after interface type changes etc. 1641 */ 1642 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1643 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1644 rdev->ops->set_power_mgmt && 1645 rdev_set_power_mgmt(rdev, dev, wdev->ps, 1646 wdev->ps_timeout)) { 1647 /* assume this means it's off */ 1648 wdev->ps = false; 1649 } 1650 wiphy_unlock(&rdev->wiphy); 1651 break; 1652 case NETDEV_PRE_UP: 1653 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype, 1654 wdev->use_4addr, 0)) 1655 return notifier_from_errno(-EOPNOTSUPP); 1656 1657 if (rfkill_blocked(rdev->wiphy.rfkill)) 1658 return notifier_from_errno(-ERFKILL); 1659 break; 1660 default: 1661 return NOTIFY_DONE; 1662 } 1663 1664 wireless_nlevent_flush(); 1665 1666 return NOTIFY_OK; 1667 } 1668 1669 static struct notifier_block cfg80211_netdev_notifier = { 1670 .notifier_call = cfg80211_netdev_notifier_call, 1671 }; 1672 1673 static void __net_exit cfg80211_pernet_exit(struct net *net) 1674 { 1675 struct cfg80211_registered_device *rdev; 1676 1677 rtnl_lock(); 1678 for_each_rdev(rdev) { 1679 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1680 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1681 } 1682 rtnl_unlock(); 1683 } 1684 1685 static struct pernet_operations cfg80211_pernet_ops = { 1686 .exit = cfg80211_pernet_exit, 1687 }; 1688 1689 void wiphy_work_queue(struct wiphy *wiphy, struct wiphy_work *work) 1690 { 1691 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1692 unsigned long flags; 1693 1694 trace_wiphy_work_queue(wiphy, work); 1695 1696 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1697 if (list_empty(&work->entry)) 1698 list_add_tail(&work->entry, &rdev->wiphy_work_list); 1699 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1700 1701 queue_work(system_unbound_wq, &rdev->wiphy_work); 1702 } 1703 EXPORT_SYMBOL_GPL(wiphy_work_queue); 1704 1705 void wiphy_work_cancel(struct wiphy *wiphy, struct wiphy_work *work) 1706 { 1707 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1708 unsigned long flags; 1709 1710 lockdep_assert_held(&wiphy->mtx); 1711 1712 trace_wiphy_work_cancel(wiphy, work); 1713 1714 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1715 if (!list_empty(&work->entry)) 1716 list_del_init(&work->entry); 1717 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1718 } 1719 EXPORT_SYMBOL_GPL(wiphy_work_cancel); 1720 1721 void wiphy_work_flush(struct wiphy *wiphy, struct wiphy_work *work) 1722 { 1723 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1724 unsigned long flags; 1725 bool run; 1726 1727 trace_wiphy_work_flush(wiphy, work); 1728 1729 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1730 run = !work || !list_empty(&work->entry); 1731 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1732 1733 if (run) 1734 cfg80211_process_wiphy_works(rdev, work); 1735 } 1736 EXPORT_SYMBOL_GPL(wiphy_work_flush); 1737 1738 void wiphy_delayed_work_timer(struct timer_list *t) 1739 { 1740 struct wiphy_delayed_work *dwork = timer_container_of(dwork, t, timer); 1741 1742 wiphy_work_queue(dwork->wiphy, &dwork->work); 1743 } 1744 EXPORT_SYMBOL(wiphy_delayed_work_timer); 1745 1746 void wiphy_delayed_work_queue(struct wiphy *wiphy, 1747 struct wiphy_delayed_work *dwork, 1748 unsigned long delay) 1749 { 1750 trace_wiphy_delayed_work_queue(wiphy, &dwork->work, delay); 1751 1752 if (!delay) { 1753 timer_delete(&dwork->timer); 1754 wiphy_work_queue(wiphy, &dwork->work); 1755 return; 1756 } 1757 1758 dwork->wiphy = wiphy; 1759 mod_timer(&dwork->timer, jiffies + delay); 1760 } 1761 EXPORT_SYMBOL_GPL(wiphy_delayed_work_queue); 1762 1763 void wiphy_delayed_work_cancel(struct wiphy *wiphy, 1764 struct wiphy_delayed_work *dwork) 1765 { 1766 lockdep_assert_held(&wiphy->mtx); 1767 1768 timer_delete_sync(&dwork->timer); 1769 wiphy_work_cancel(wiphy, &dwork->work); 1770 } 1771 EXPORT_SYMBOL_GPL(wiphy_delayed_work_cancel); 1772 1773 void wiphy_delayed_work_flush(struct wiphy *wiphy, 1774 struct wiphy_delayed_work *dwork) 1775 { 1776 lockdep_assert_held(&wiphy->mtx); 1777 1778 timer_delete_sync(&dwork->timer); 1779 wiphy_work_flush(wiphy, &dwork->work); 1780 } 1781 EXPORT_SYMBOL_GPL(wiphy_delayed_work_flush); 1782 1783 bool wiphy_delayed_work_pending(struct wiphy *wiphy, 1784 struct wiphy_delayed_work *dwork) 1785 { 1786 return timer_pending(&dwork->timer); 1787 } 1788 EXPORT_SYMBOL_GPL(wiphy_delayed_work_pending); 1789 1790 static int __init cfg80211_init(void) 1791 { 1792 int err; 1793 1794 err = register_pernet_device(&cfg80211_pernet_ops); 1795 if (err) 1796 goto out_fail_pernet; 1797 1798 err = wiphy_sysfs_init(); 1799 if (err) 1800 goto out_fail_sysfs; 1801 1802 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1803 if (err) 1804 goto out_fail_notifier; 1805 1806 err = nl80211_init(); 1807 if (err) 1808 goto out_fail_nl80211; 1809 1810 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1811 1812 err = regulatory_init(); 1813 if (err) 1814 goto out_fail_reg; 1815 1816 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM); 1817 if (!cfg80211_wq) { 1818 err = -ENOMEM; 1819 goto out_fail_wq; 1820 } 1821 1822 return 0; 1823 1824 out_fail_wq: 1825 regulatory_exit(); 1826 out_fail_reg: 1827 debugfs_remove(ieee80211_debugfs_dir); 1828 nl80211_exit(); 1829 out_fail_nl80211: 1830 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1831 out_fail_notifier: 1832 wiphy_sysfs_exit(); 1833 out_fail_sysfs: 1834 unregister_pernet_device(&cfg80211_pernet_ops); 1835 out_fail_pernet: 1836 return err; 1837 } 1838 fs_initcall(cfg80211_init); 1839 1840 static void __exit cfg80211_exit(void) 1841 { 1842 debugfs_remove(ieee80211_debugfs_dir); 1843 nl80211_exit(); 1844 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1845 wiphy_sysfs_exit(); 1846 regulatory_exit(); 1847 unregister_pernet_device(&cfg80211_pernet_ops); 1848 destroy_workqueue(cfg80211_wq); 1849 } 1850 module_exit(cfg80211_exit); 1851