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 guard(wiphy)(&rdev->wiphy); 195 196 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 197 if (!wdev->netdev) 198 continue; 199 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 200 } 201 202 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 203 204 wiphy_net_set(&rdev->wiphy, net); 205 206 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev)); 207 WARN_ON(err); 208 209 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 210 211 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 212 if (!wdev->netdev) 213 continue; 214 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 215 } 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 guard(wiphy)(&rdev->wiphy); 225 226 rdev_rfkill_poll(rdev); 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 guard(wiphy)(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 } 300 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces); 301 302 static int cfg80211_rfkill_set_block(void *data, bool blocked) 303 { 304 struct cfg80211_registered_device *rdev = data; 305 306 if (!blocked) 307 return 0; 308 309 rtnl_lock(); 310 cfg80211_shutdown_all_interfaces(&rdev->wiphy); 311 rtnl_unlock(); 312 313 return 0; 314 } 315 316 static void cfg80211_rfkill_block_work(struct work_struct *work) 317 { 318 struct cfg80211_registered_device *rdev; 319 320 rdev = container_of(work, struct cfg80211_registered_device, 321 rfkill_block); 322 cfg80211_rfkill_set_block(rdev, true); 323 } 324 325 static void cfg80211_event_work(struct work_struct *work) 326 { 327 struct cfg80211_registered_device *rdev; 328 329 rdev = container_of(work, struct cfg80211_registered_device, 330 event_work); 331 332 guard(wiphy)(&rdev->wiphy); 333 334 cfg80211_process_rdev_events(rdev); 335 } 336 337 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev) 338 { 339 struct wireless_dev *wdev, *tmp; 340 341 ASSERT_RTNL(); 342 343 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) { 344 if (wdev->nl_owner_dead) { 345 if (wdev->netdev) 346 dev_close(wdev->netdev); 347 348 guard(wiphy)(&rdev->wiphy); 349 350 cfg80211_leave(rdev, wdev); 351 cfg80211_remove_virtual_intf(rdev, wdev); 352 } 353 } 354 } 355 356 static void cfg80211_destroy_iface_wk(struct work_struct *work) 357 { 358 struct cfg80211_registered_device *rdev; 359 360 rdev = container_of(work, struct cfg80211_registered_device, 361 destroy_work); 362 363 rtnl_lock(); 364 cfg80211_destroy_ifaces(rdev); 365 rtnl_unlock(); 366 } 367 368 static void cfg80211_sched_scan_stop_wk(struct wiphy *wiphy, 369 struct wiphy_work *work) 370 { 371 struct cfg80211_registered_device *rdev; 372 struct cfg80211_sched_scan_request *req, *tmp; 373 374 rdev = container_of(work, struct cfg80211_registered_device, 375 sched_scan_stop_wk); 376 377 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { 378 if (req->nl_owner_dead) 379 cfg80211_stop_sched_scan_req(rdev, req, false); 380 } 381 } 382 383 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work) 384 { 385 struct cfg80211_registered_device *rdev; 386 387 rdev = container_of(work, struct cfg80211_registered_device, 388 propagate_radar_detect_wk); 389 390 rtnl_lock(); 391 392 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef, 393 NL80211_DFS_UNAVAILABLE, 394 NL80211_RADAR_DETECTED); 395 396 rtnl_unlock(); 397 } 398 399 static void cfg80211_propagate_cac_done_wk(struct work_struct *work) 400 { 401 struct cfg80211_registered_device *rdev; 402 403 rdev = container_of(work, struct cfg80211_registered_device, 404 propagate_cac_done_wk); 405 406 rtnl_lock(); 407 408 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef, 409 NL80211_DFS_AVAILABLE, 410 NL80211_RADAR_CAC_FINISHED); 411 412 rtnl_unlock(); 413 } 414 415 static void cfg80211_wiphy_work(struct work_struct *work) 416 { 417 struct cfg80211_registered_device *rdev; 418 struct wiphy_work *wk; 419 420 rdev = container_of(work, struct cfg80211_registered_device, wiphy_work); 421 422 trace_wiphy_work_worker_start(&rdev->wiphy); 423 424 guard(wiphy)(&rdev->wiphy); 425 if (rdev->suspended) 426 return; 427 428 spin_lock_irq(&rdev->wiphy_work_lock); 429 wk = list_first_entry_or_null(&rdev->wiphy_work_list, 430 struct wiphy_work, entry); 431 if (wk) { 432 list_del_init(&wk->entry); 433 if (!list_empty(&rdev->wiphy_work_list)) 434 queue_work(system_unbound_wq, work); 435 spin_unlock_irq(&rdev->wiphy_work_lock); 436 437 trace_wiphy_work_run(&rdev->wiphy, wk); 438 wk->func(&rdev->wiphy, wk); 439 } else { 440 spin_unlock_irq(&rdev->wiphy_work_lock); 441 } 442 } 443 444 /* exported functions */ 445 446 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, 447 const char *requested_name) 448 { 449 static atomic_t wiphy_counter = ATOMIC_INIT(0); 450 451 struct cfg80211_registered_device *rdev; 452 int alloc_size; 453 454 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 455 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 456 WARN_ON(ops->connect && !ops->disconnect); 457 WARN_ON(ops->join_ibss && !ops->leave_ibss); 458 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 459 WARN_ON(ops->add_station && !ops->del_station); 460 WARN_ON(ops->add_mpath && !ops->del_mpath); 461 WARN_ON(ops->join_mesh && !ops->leave_mesh); 462 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device); 463 WARN_ON(ops->start_ap && !ops->stop_ap); 464 WARN_ON(ops->join_ocb && !ops->leave_ocb); 465 WARN_ON(ops->suspend && !ops->resume); 466 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop); 467 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel); 468 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch); 469 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts); 470 471 alloc_size = sizeof(*rdev) + sizeof_priv; 472 473 rdev = kzalloc(alloc_size, GFP_KERNEL); 474 if (!rdev) 475 return NULL; 476 477 rdev->ops = ops; 478 479 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 480 481 if (unlikely(rdev->wiphy_idx < 0)) { 482 /* ugh, wrapped! */ 483 atomic_dec(&wiphy_counter); 484 kfree(rdev); 485 return NULL; 486 } 487 488 /* atomic_inc_return makes it start at 1, make it start at 0 */ 489 rdev->wiphy_idx--; 490 491 /* give it a proper name */ 492 if (requested_name && requested_name[0]) { 493 int rv; 494 495 rtnl_lock(); 496 rv = cfg80211_dev_check_name(rdev, requested_name); 497 498 if (rv < 0) { 499 rtnl_unlock(); 500 goto use_default_name; 501 } 502 503 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); 504 rtnl_unlock(); 505 if (rv) 506 goto use_default_name; 507 } else { 508 int rv; 509 510 use_default_name: 511 /* NOTE: This is *probably* safe w/out holding rtnl because of 512 * the restrictions on phy names. Probably this call could 513 * fail if some other part of the kernel (re)named a device 514 * phyX. But, might should add some locking and check return 515 * value, and use a different name if this one exists? 516 */ 517 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 518 if (rv < 0) { 519 kfree(rdev); 520 return NULL; 521 } 522 } 523 524 mutex_init(&rdev->wiphy.mtx); 525 INIT_LIST_HEAD(&rdev->wiphy.wdev_list); 526 INIT_LIST_HEAD(&rdev->beacon_registrations); 527 spin_lock_init(&rdev->beacon_registrations_lock); 528 spin_lock_init(&rdev->bss_lock); 529 INIT_LIST_HEAD(&rdev->bss_list); 530 INIT_LIST_HEAD(&rdev->sched_scan_req_list); 531 wiphy_work_init(&rdev->scan_done_wk, __cfg80211_scan_done); 532 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 533 cfg80211_dfs_channels_update_work); 534 #ifdef CONFIG_CFG80211_WEXT 535 rdev->wiphy.wext = &cfg80211_wext_handler; 536 #endif 537 538 device_initialize(&rdev->wiphy.dev); 539 rdev->wiphy.dev.class = &ieee80211_class; 540 rdev->wiphy.dev.platform_data = rdev; 541 device_enable_async_suspend(&rdev->wiphy.dev); 542 543 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 544 wiphy_work_init(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 545 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk); 546 INIT_WORK(&rdev->propagate_radar_detect_wk, 547 cfg80211_propagate_radar_detect_wk); 548 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk); 549 INIT_WORK(&rdev->mgmt_registrations_update_wk, 550 cfg80211_mgmt_registrations_update_wk); 551 spin_lock_init(&rdev->mgmt_registrations_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->wiphy_work, cfg80211_wiphy_work); 570 INIT_LIST_HEAD(&rdev->wiphy_work_list); 571 spin_lock_init(&rdev->wiphy_work_lock); 572 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work); 573 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 574 INIT_WORK(&rdev->event_work, cfg80211_event_work); 575 INIT_WORK(&rdev->background_cac_abort_wk, 576 cfg80211_background_cac_abort_wk); 577 INIT_DELAYED_WORK(&rdev->background_cac_done_wk, 578 cfg80211_background_cac_done_wk); 579 580 init_waitqueue_head(&rdev->dev_wait); 581 582 /* 583 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 584 * Fragmentation and RTS threshold are disabled by default with the 585 * special -1 value. 586 */ 587 rdev->wiphy.retry_short = 7; 588 rdev->wiphy.retry_long = 4; 589 rdev->wiphy.frag_threshold = (u32) -1; 590 rdev->wiphy.rts_threshold = (u32) -1; 591 rdev->wiphy.coverage_class = 0; 592 593 rdev->wiphy.max_num_csa_counters = 1; 594 595 rdev->wiphy.max_sched_scan_plans = 1; 596 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 597 598 return &rdev->wiphy; 599 } 600 EXPORT_SYMBOL(wiphy_new_nm); 601 602 static 603 int wiphy_verify_iface_combinations(struct wiphy *wiphy, 604 const struct ieee80211_iface_combination *iface_comb, 605 int n_iface_comb, 606 bool combined_radio) 607 { 608 const struct ieee80211_iface_combination *c; 609 int i, j; 610 611 for (i = 0; i < n_iface_comb; i++) { 612 u32 cnt = 0; 613 u16 all_iftypes = 0; 614 615 c = &iface_comb[i]; 616 617 /* 618 * Combinations with just one interface aren't real, 619 * however we make an exception for DFS. 620 */ 621 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 622 return -EINVAL; 623 624 /* Need at least one channel */ 625 if (WARN_ON(!c->num_different_channels)) 626 return -EINVAL; 627 628 /* DFS only works on one channel. Avoid this check 629 * for multi-radio global combination, since it hold 630 * the capabilities of all radio combinations. 631 */ 632 if (!combined_radio && 633 WARN_ON(c->radar_detect_widths && 634 c->num_different_channels > 1)) 635 return -EINVAL; 636 637 if (WARN_ON(!c->n_limits)) 638 return -EINVAL; 639 640 for (j = 0; j < c->n_limits; j++) { 641 u16 types = c->limits[j].types; 642 643 /* interface types shouldn't overlap */ 644 if (WARN_ON(types & all_iftypes)) 645 return -EINVAL; 646 all_iftypes |= types; 647 648 if (WARN_ON(!c->limits[j].max)) 649 return -EINVAL; 650 651 /* Shouldn't list software iftypes in combinations! */ 652 if (WARN_ON(wiphy->software_iftypes & types)) 653 return -EINVAL; 654 655 /* Only a single P2P_DEVICE can be allowed, avoid this 656 * check for multi-radio global combination, since it 657 * hold the capabilities of all radio combinations. 658 */ 659 if (!combined_radio && 660 WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 661 c->limits[j].max > 1)) 662 return -EINVAL; 663 664 /* Only a single NAN can be allowed, avoid this 665 * check for multi-radio global combination, since it 666 * hold the capabilities of all radio combinations. 667 */ 668 if (!combined_radio && 669 WARN_ON(types & BIT(NL80211_IFTYPE_NAN) && 670 c->limits[j].max > 1)) 671 return -EINVAL; 672 673 /* 674 * This isn't well-defined right now. If you have an 675 * IBSS interface, then its beacon interval may change 676 * by joining other networks, and nothing prevents it 677 * from doing that. 678 * So technically we probably shouldn't even allow AP 679 * and IBSS in the same interface, but it seems that 680 * some drivers support that, possibly only with fixed 681 * beacon intervals for IBSS. 682 */ 683 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) && 684 c->beacon_int_min_gcd)) { 685 return -EINVAL; 686 } 687 688 cnt += c->limits[j].max; 689 /* 690 * Don't advertise an unsupported type 691 * in a combination. 692 */ 693 if (WARN_ON((wiphy->interface_modes & types) != types)) 694 return -EINVAL; 695 } 696 697 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS))) 698 return -EINVAL; 699 700 /* You can't even choose that many! */ 701 if (WARN_ON(cnt < c->max_interfaces)) 702 return -EINVAL; 703 } 704 705 return 0; 706 } 707 708 static int wiphy_verify_combinations(struct wiphy *wiphy) 709 { 710 int i, ret; 711 bool combined_radio = false; 712 713 if (wiphy->n_radio) { 714 for (i = 0; i < wiphy->n_radio; i++) { 715 const struct wiphy_radio *radio = &wiphy->radio[i]; 716 717 ret = wiphy_verify_iface_combinations(wiphy, 718 radio->iface_combinations, 719 radio->n_iface_combinations, 720 false); 721 if (ret) 722 return ret; 723 } 724 725 combined_radio = true; 726 } 727 728 ret = wiphy_verify_iface_combinations(wiphy, 729 wiphy->iface_combinations, 730 wiphy->n_iface_combinations, 731 combined_radio); 732 733 return ret; 734 } 735 736 int wiphy_register(struct wiphy *wiphy) 737 { 738 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 739 int res; 740 enum nl80211_band band; 741 struct ieee80211_supported_band *sband; 742 bool have_band = false; 743 int i; 744 u16 ifmodes = wiphy->interface_modes; 745 746 #ifdef CONFIG_PM 747 if (WARN_ON(wiphy->wowlan && 748 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 749 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 750 return -EINVAL; 751 if (WARN_ON(wiphy->wowlan && 752 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 753 !wiphy->wowlan->tcp)) 754 return -EINVAL; 755 #endif 756 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 757 (!rdev->ops->tdls_channel_switch || 758 !rdev->ops->tdls_cancel_channel_switch))) 759 return -EINVAL; 760 761 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) && 762 (!rdev->ops->start_nan || !rdev->ops->stop_nan || 763 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func || 764 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ))))) 765 return -EINVAL; 766 767 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))) 768 return -EINVAL; 769 770 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported)) 771 return -EINVAL; 772 773 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) { 774 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap && 775 !wiphy->pmsr_capa->ftm.non_asap)) 776 return -EINVAL; 777 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles || 778 !wiphy->pmsr_capa->ftm.bandwidths)) 779 return -EINVAL; 780 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles & 781 ~(BIT(NL80211_PREAMBLE_LEGACY) | 782 BIT(NL80211_PREAMBLE_HT) | 783 BIT(NL80211_PREAMBLE_VHT) | 784 BIT(NL80211_PREAMBLE_HE) | 785 BIT(NL80211_PREAMBLE_DMG)))) 786 return -EINVAL; 787 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based || 788 wiphy->pmsr_capa->ftm.non_trigger_based) && 789 !(wiphy->pmsr_capa->ftm.preambles & 790 BIT(NL80211_PREAMBLE_HE)))) 791 return -EINVAL; 792 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths & 793 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) | 794 BIT(NL80211_CHAN_WIDTH_20) | 795 BIT(NL80211_CHAN_WIDTH_40) | 796 BIT(NL80211_CHAN_WIDTH_80) | 797 BIT(NL80211_CHAN_WIDTH_80P80) | 798 BIT(NL80211_CHAN_WIDTH_160) | 799 BIT(NL80211_CHAN_WIDTH_5) | 800 BIT(NL80211_CHAN_WIDTH_10)))) 801 return -EINVAL; 802 } 803 804 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 805 (wiphy->regulatory_flags & 806 (REGULATORY_CUSTOM_REG | 807 REGULATORY_STRICT_REG | 808 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 809 REGULATORY_COUNTRY_IE_IGNORE)))) 810 return -EINVAL; 811 812 if (WARN_ON(wiphy->coalesce && 813 (!wiphy->coalesce->n_rules || 814 !wiphy->coalesce->n_patterns) && 815 (!wiphy->coalesce->pattern_min_len || 816 wiphy->coalesce->pattern_min_len > 817 wiphy->coalesce->pattern_max_len))) 818 return -EINVAL; 819 820 if (WARN_ON(wiphy->ap_sme_capa && 821 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 822 return -EINVAL; 823 824 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 825 return -EINVAL; 826 827 if (WARN_ON(wiphy->addresses && 828 !is_zero_ether_addr(wiphy->perm_addr) && 829 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 830 ETH_ALEN))) 831 return -EINVAL; 832 833 if (WARN_ON(wiphy->max_acl_mac_addrs && 834 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 835 !rdev->ops->set_mac_acl))) 836 return -EINVAL; 837 838 /* assure only valid behaviours are flagged by driver 839 * hence subtract 2 as bit 0 is invalid. 840 */ 841 if (WARN_ON(wiphy->bss_select_support && 842 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 843 return -EINVAL; 844 845 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy, 846 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) && 847 (!rdev->ops->set_pmk || !rdev->ops->del_pmk))) 848 return -EINVAL; 849 850 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) && 851 rdev->ops->update_connect_params)) 852 return -EINVAL; 853 854 if (wiphy->addresses) 855 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 856 857 /* sanity check ifmodes */ 858 WARN_ON(!ifmodes); 859 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 860 if (WARN_ON(ifmodes != wiphy->interface_modes)) 861 wiphy->interface_modes = ifmodes; 862 863 res = wiphy_verify_combinations(wiphy); 864 if (res) 865 return res; 866 867 /* sanity check supported bands/channels */ 868 for (band = 0; band < NUM_NL80211_BANDS; band++) { 869 const struct ieee80211_sband_iftype_data *iftd; 870 u16 types = 0; 871 bool have_he = false; 872 873 sband = wiphy->bands[band]; 874 if (!sband) 875 continue; 876 877 sband->band = band; 878 if (WARN_ON(!sband->n_channels)) 879 return -EINVAL; 880 /* 881 * on 60GHz or sub-1Ghz band, there are no legacy rates, so 882 * n_bitrates is 0 883 */ 884 if (WARN_ON((band != NL80211_BAND_60GHZ && 885 band != NL80211_BAND_S1GHZ) && 886 !sband->n_bitrates)) 887 return -EINVAL; 888 889 if (WARN_ON(band == NL80211_BAND_6GHZ && 890 (sband->ht_cap.ht_supported || 891 sband->vht_cap.vht_supported))) 892 return -EINVAL; 893 894 /* 895 * Since cfg80211_disable_40mhz_24ghz is global, we can 896 * modify the sband's ht data even if the driver uses a 897 * global structure for that. 898 */ 899 if (cfg80211_disable_40mhz_24ghz && 900 band == NL80211_BAND_2GHZ && 901 sband->ht_cap.ht_supported) { 902 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 903 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 904 } 905 906 /* 907 * Since we use a u32 for rate bitmaps in 908 * ieee80211_get_response_rate, we cannot 909 * have more than 32 legacy rates. 910 */ 911 if (WARN_ON(sband->n_bitrates > 32)) 912 return -EINVAL; 913 914 for (i = 0; i < sband->n_channels; i++) { 915 sband->channels[i].orig_flags = 916 sband->channels[i].flags; 917 sband->channels[i].orig_mag = INT_MAX; 918 sband->channels[i].orig_mpwr = 919 sband->channels[i].max_power; 920 sband->channels[i].band = band; 921 922 if (WARN_ON(sband->channels[i].freq_offset >= 1000)) 923 return -EINVAL; 924 } 925 926 for_each_sband_iftype_data(sband, i, iftd) { 927 bool has_ap, has_non_ap; 928 u32 ap_bits = BIT(NL80211_IFTYPE_AP) | 929 BIT(NL80211_IFTYPE_P2P_GO); 930 931 if (WARN_ON(!iftd->types_mask)) 932 return -EINVAL; 933 if (WARN_ON(types & iftd->types_mask)) 934 return -EINVAL; 935 936 /* at least one piece of information must be present */ 937 if (WARN_ON(!iftd->he_cap.has_he)) 938 return -EINVAL; 939 940 types |= iftd->types_mask; 941 942 if (i == 0) 943 have_he = iftd->he_cap.has_he; 944 else 945 have_he = have_he && 946 iftd->he_cap.has_he; 947 948 has_ap = iftd->types_mask & ap_bits; 949 has_non_ap = iftd->types_mask & ~ap_bits; 950 951 /* 952 * For EHT 20 MHz STA, the capabilities format differs 953 * but to simplify, don't check 20 MHz but rather check 954 * only if AP and non-AP were mentioned at the same time, 955 * reject if so. 956 */ 957 if (WARN_ON(iftd->eht_cap.has_eht && 958 has_ap && has_non_ap)) 959 return -EINVAL; 960 } 961 962 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ)) 963 return -EINVAL; 964 965 have_band = true; 966 } 967 968 if (!have_band) { 969 WARN_ON(1); 970 return -EINVAL; 971 } 972 973 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) { 974 /* 975 * Validate we have a policy (can be explicitly set to 976 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that 977 * we have at least one of doit/dumpit. 978 */ 979 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy)) 980 return -EINVAL; 981 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit && 982 !rdev->wiphy.vendor_commands[i].dumpit)) 983 return -EINVAL; 984 } 985 986 #ifdef CONFIG_PM 987 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 988 (!rdev->wiphy.wowlan->pattern_min_len || 989 rdev->wiphy.wowlan->pattern_min_len > 990 rdev->wiphy.wowlan->pattern_max_len))) 991 return -EINVAL; 992 #endif 993 994 if (!wiphy->max_num_akm_suites) 995 wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES; 996 else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES || 997 wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES) 998 return -EINVAL; 999 1000 /* check and set up bitrates */ 1001 ieee80211_set_bitrate_flags(wiphy); 1002 1003 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 1004 1005 rtnl_lock(); 1006 wiphy_lock(&rdev->wiphy); 1007 res = device_add(&rdev->wiphy.dev); 1008 if (res) { 1009 wiphy_unlock(&rdev->wiphy); 1010 rtnl_unlock(); 1011 return res; 1012 } 1013 1014 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 1015 cfg80211_rdev_list_generation++; 1016 1017 /* add to debugfs */ 1018 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy), 1019 ieee80211_debugfs_dir); 1020 1021 cfg80211_debugfs_rdev_add(rdev); 1022 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 1023 wiphy_unlock(&rdev->wiphy); 1024 1025 /* set up regulatory info */ 1026 wiphy_regulatory_register(wiphy); 1027 1028 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 1029 struct regulatory_request request; 1030 1031 request.wiphy_idx = get_wiphy_idx(wiphy); 1032 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 1033 request.alpha2[0] = '9'; 1034 request.alpha2[1] = '9'; 1035 1036 nl80211_send_reg_change_event(&request); 1037 } 1038 1039 /* Check that nobody globally advertises any capabilities they do not 1040 * advertise on all possible interface types. 1041 */ 1042 if (wiphy->extended_capabilities_len && 1043 wiphy->num_iftype_ext_capab && 1044 wiphy->iftype_ext_capab) { 1045 u8 supported_on_all, j; 1046 const struct wiphy_iftype_ext_capab *capab; 1047 1048 capab = wiphy->iftype_ext_capab; 1049 for (j = 0; j < wiphy->extended_capabilities_len; j++) { 1050 if (capab[0].extended_capabilities_len > j) 1051 supported_on_all = 1052 capab[0].extended_capabilities[j]; 1053 else 1054 supported_on_all = 0x00; 1055 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) { 1056 if (j >= capab[i].extended_capabilities_len) { 1057 supported_on_all = 0x00; 1058 break; 1059 } 1060 supported_on_all &= 1061 capab[i].extended_capabilities[j]; 1062 } 1063 if (WARN_ON(wiphy->extended_capabilities[j] & 1064 ~supported_on_all)) 1065 break; 1066 } 1067 } 1068 1069 rdev->wiphy.registered = true; 1070 rtnl_unlock(); 1071 1072 res = rfkill_register(rdev->wiphy.rfkill); 1073 if (res) { 1074 rfkill_destroy(rdev->wiphy.rfkill); 1075 rdev->wiphy.rfkill = NULL; 1076 wiphy_unregister(&rdev->wiphy); 1077 return res; 1078 } 1079 1080 return 0; 1081 } 1082 EXPORT_SYMBOL(wiphy_register); 1083 1084 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 1085 { 1086 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1087 1088 if (!rdev->ops->rfkill_poll) 1089 return; 1090 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 1091 rfkill_resume_polling(wiphy->rfkill); 1092 } 1093 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 1094 1095 void cfg80211_process_wiphy_works(struct cfg80211_registered_device *rdev, 1096 struct wiphy_work *end) 1097 { 1098 unsigned int runaway_limit = 100; 1099 unsigned long flags; 1100 1101 lockdep_assert_held(&rdev->wiphy.mtx); 1102 1103 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1104 while (!list_empty(&rdev->wiphy_work_list)) { 1105 struct wiphy_work *wk; 1106 1107 wk = list_first_entry(&rdev->wiphy_work_list, 1108 struct wiphy_work, entry); 1109 list_del_init(&wk->entry); 1110 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1111 1112 trace_wiphy_work_run(&rdev->wiphy, wk); 1113 wk->func(&rdev->wiphy, wk); 1114 1115 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1116 1117 if (wk == end) 1118 break; 1119 1120 if (WARN_ON(--runaway_limit == 0)) 1121 INIT_LIST_HEAD(&rdev->wiphy_work_list); 1122 } 1123 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1124 } 1125 1126 void wiphy_unregister(struct wiphy *wiphy) 1127 { 1128 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1129 1130 wait_event(rdev->dev_wait, ({ 1131 int __count; 1132 wiphy_lock(&rdev->wiphy); 1133 __count = rdev->opencount; 1134 wiphy_unlock(&rdev->wiphy); 1135 __count == 0; })); 1136 1137 if (rdev->wiphy.rfkill) 1138 rfkill_unregister(rdev->wiphy.rfkill); 1139 1140 rtnl_lock(); 1141 wiphy_lock(&rdev->wiphy); 1142 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 1143 rdev->wiphy.registered = false; 1144 1145 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 1146 1147 /* 1148 * First remove the hardware from everywhere, this makes 1149 * it impossible to find from userspace. 1150 */ 1151 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 1152 list_del_rcu(&rdev->list); 1153 synchronize_rcu(); 1154 1155 /* 1156 * If this device got a regulatory hint tell core its 1157 * free to listen now to a new shiny device regulatory hint 1158 */ 1159 wiphy_regulatory_deregister(wiphy); 1160 1161 cfg80211_rdev_list_generation++; 1162 device_del(&rdev->wiphy.dev); 1163 1164 #ifdef CONFIG_PM 1165 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 1166 rdev_set_wakeup(rdev, false); 1167 #endif 1168 1169 /* surely nothing is reachable now, clean up work */ 1170 cfg80211_process_wiphy_works(rdev, NULL); 1171 wiphy_unlock(&rdev->wiphy); 1172 rtnl_unlock(); 1173 1174 /* this has nothing to do now but make sure it's gone */ 1175 cancel_work_sync(&rdev->wiphy_work); 1176 1177 cancel_work_sync(&rdev->conn_work); 1178 flush_work(&rdev->event_work); 1179 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 1180 cancel_delayed_work_sync(&rdev->background_cac_done_wk); 1181 flush_work(&rdev->destroy_work); 1182 flush_work(&rdev->propagate_radar_detect_wk); 1183 flush_work(&rdev->propagate_cac_done_wk); 1184 flush_work(&rdev->mgmt_registrations_update_wk); 1185 flush_work(&rdev->background_cac_abort_wk); 1186 1187 cfg80211_rdev_free_wowlan(rdev); 1188 cfg80211_free_coalesce(rdev->coalesce); 1189 rdev->coalesce = NULL; 1190 } 1191 EXPORT_SYMBOL(wiphy_unregister); 1192 1193 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 1194 { 1195 struct cfg80211_internal_bss *scan, *tmp; 1196 struct cfg80211_beacon_registration *reg, *treg; 1197 rfkill_destroy(rdev->wiphy.rfkill); 1198 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 1199 list_del(®->list); 1200 kfree(reg); 1201 } 1202 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 1203 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 1204 mutex_destroy(&rdev->wiphy.mtx); 1205 1206 /* 1207 * The 'regd' can only be non-NULL if we never finished 1208 * initializing the wiphy and thus never went through the 1209 * unregister path - e.g. in failure scenarios. Thus, it 1210 * cannot have been visible to anyone if non-NULL, so we 1211 * can just free it here. 1212 */ 1213 kfree(rcu_dereference_raw(rdev->wiphy.regd)); 1214 1215 kfree(rdev); 1216 } 1217 1218 void wiphy_free(struct wiphy *wiphy) 1219 { 1220 put_device(&wiphy->dev); 1221 } 1222 EXPORT_SYMBOL(wiphy_free); 1223 1224 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked, 1225 enum rfkill_hard_block_reasons reason) 1226 { 1227 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1228 1229 if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason)) 1230 schedule_work(&rdev->rfkill_block); 1231 } 1232 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason); 1233 1234 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev, 1235 bool unregister_netdev) 1236 { 1237 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1238 struct cfg80211_cqm_config *cqm_config; 1239 unsigned int link_id; 1240 1241 ASSERT_RTNL(); 1242 lockdep_assert_held(&rdev->wiphy.mtx); 1243 1244 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 1245 1246 wdev->registered = false; 1247 1248 if (wdev->netdev) { 1249 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211"); 1250 if (unregister_netdev) 1251 unregister_netdevice(wdev->netdev); 1252 } 1253 1254 list_del_rcu(&wdev->list); 1255 synchronize_net(); 1256 rdev->devlist_generation++; 1257 1258 cfg80211_mlme_purge_registrations(wdev); 1259 1260 switch (wdev->iftype) { 1261 case NL80211_IFTYPE_P2P_DEVICE: 1262 cfg80211_stop_p2p_device(rdev, wdev); 1263 break; 1264 case NL80211_IFTYPE_NAN: 1265 cfg80211_stop_nan(rdev, wdev); 1266 break; 1267 default: 1268 break; 1269 } 1270 1271 #ifdef CONFIG_CFG80211_WEXT 1272 kfree_sensitive(wdev->wext.keys); 1273 wdev->wext.keys = NULL; 1274 #endif 1275 wiphy_work_cancel(wdev->wiphy, &wdev->cqm_rssi_work); 1276 /* deleted from the list, so can't be found from nl80211 any more */ 1277 cqm_config = rcu_access_pointer(wdev->cqm_config); 1278 kfree_rcu(cqm_config, rcu_head); 1279 RCU_INIT_POINTER(wdev->cqm_config, NULL); 1280 1281 /* 1282 * Ensure that all events have been processed and 1283 * freed. 1284 */ 1285 cfg80211_process_wdev_events(wdev); 1286 1287 if (wdev->iftype == NL80211_IFTYPE_STATION || 1288 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) { 1289 for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) { 1290 struct cfg80211_internal_bss *curbss; 1291 1292 curbss = wdev->links[link_id].client.current_bss; 1293 1294 if (WARN_ON(curbss)) { 1295 cfg80211_unhold_bss(curbss); 1296 cfg80211_put_bss(wdev->wiphy, &curbss->pub); 1297 wdev->links[link_id].client.current_bss = NULL; 1298 } 1299 } 1300 } 1301 1302 wdev->connected = false; 1303 } 1304 1305 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 1306 { 1307 _cfg80211_unregister_wdev(wdev, true); 1308 } 1309 EXPORT_SYMBOL(cfg80211_unregister_wdev); 1310 1311 static const struct device_type wiphy_type = { 1312 .name = "wlan", 1313 }; 1314 1315 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 1316 enum nl80211_iftype iftype, int num) 1317 { 1318 lockdep_assert_held(&rdev->wiphy.mtx); 1319 1320 rdev->num_running_ifaces += num; 1321 if (iftype == NL80211_IFTYPE_MONITOR) 1322 rdev->num_running_monitor_ifaces += num; 1323 } 1324 1325 void cfg80211_leave(struct cfg80211_registered_device *rdev, 1326 struct wireless_dev *wdev) 1327 { 1328 struct net_device *dev = wdev->netdev; 1329 struct cfg80211_sched_scan_request *pos, *tmp; 1330 1331 lockdep_assert_held(&rdev->wiphy.mtx); 1332 1333 cfg80211_pmsr_wdev_down(wdev); 1334 1335 cfg80211_stop_background_radar_detection(wdev); 1336 1337 switch (wdev->iftype) { 1338 case NL80211_IFTYPE_ADHOC: 1339 cfg80211_leave_ibss(rdev, dev, true); 1340 break; 1341 case NL80211_IFTYPE_P2P_CLIENT: 1342 case NL80211_IFTYPE_STATION: 1343 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, 1344 list) { 1345 if (dev == pos->dev) 1346 cfg80211_stop_sched_scan_req(rdev, pos, false); 1347 } 1348 1349 #ifdef CONFIG_CFG80211_WEXT 1350 kfree(wdev->wext.ie); 1351 wdev->wext.ie = NULL; 1352 wdev->wext.ie_len = 0; 1353 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1354 #endif 1355 cfg80211_disconnect(rdev, dev, 1356 WLAN_REASON_DEAUTH_LEAVING, true); 1357 break; 1358 case NL80211_IFTYPE_MESH_POINT: 1359 cfg80211_leave_mesh(rdev, dev); 1360 break; 1361 case NL80211_IFTYPE_AP: 1362 case NL80211_IFTYPE_P2P_GO: 1363 cfg80211_stop_ap(rdev, dev, -1, true); 1364 break; 1365 case NL80211_IFTYPE_OCB: 1366 cfg80211_leave_ocb(rdev, dev); 1367 break; 1368 case NL80211_IFTYPE_P2P_DEVICE: 1369 case NL80211_IFTYPE_NAN: 1370 /* cannot happen, has no netdev */ 1371 break; 1372 case NL80211_IFTYPE_AP_VLAN: 1373 case NL80211_IFTYPE_MONITOR: 1374 /* nothing to do */ 1375 break; 1376 case NL80211_IFTYPE_UNSPECIFIED: 1377 case NL80211_IFTYPE_WDS: 1378 case NUM_NL80211_IFTYPES: 1379 /* invalid */ 1380 break; 1381 } 1382 } 1383 1384 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 1385 gfp_t gfp) 1386 { 1387 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1388 struct cfg80211_event *ev; 1389 unsigned long flags; 1390 1391 trace_cfg80211_stop_iface(wiphy, wdev); 1392 1393 ev = kzalloc(sizeof(*ev), gfp); 1394 if (!ev) 1395 return; 1396 1397 ev->type = EVENT_STOPPED; 1398 1399 spin_lock_irqsave(&wdev->event_lock, flags); 1400 list_add_tail(&ev->list, &wdev->event_list); 1401 spin_unlock_irqrestore(&wdev->event_lock, flags); 1402 queue_work(cfg80211_wq, &rdev->event_work); 1403 } 1404 EXPORT_SYMBOL(cfg80211_stop_iface); 1405 1406 void cfg80211_init_wdev(struct wireless_dev *wdev) 1407 { 1408 INIT_LIST_HEAD(&wdev->event_list); 1409 spin_lock_init(&wdev->event_lock); 1410 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1411 INIT_LIST_HEAD(&wdev->pmsr_list); 1412 spin_lock_init(&wdev->pmsr_lock); 1413 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk); 1414 1415 #ifdef CONFIG_CFG80211_WEXT 1416 wdev->wext.default_key = -1; 1417 wdev->wext.default_mgmt_key = -1; 1418 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1419 #endif 1420 1421 wiphy_work_init(&wdev->cqm_rssi_work, cfg80211_cqm_rssi_notify_work); 1422 1423 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1424 wdev->ps = true; 1425 else 1426 wdev->ps = false; 1427 /* allow mac80211 to determine the timeout */ 1428 wdev->ps_timeout = -1; 1429 1430 wdev->radio_mask = BIT(wdev->wiphy->n_radio) - 1; 1431 1432 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1433 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1434 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1435 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE; 1436 1437 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk); 1438 } 1439 1440 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev, 1441 struct wireless_dev *wdev) 1442 { 1443 ASSERT_RTNL(); 1444 lockdep_assert_held(&rdev->wiphy.mtx); 1445 1446 /* 1447 * We get here also when the interface changes network namespaces, 1448 * as it's registered into the new one, but we don't want it to 1449 * change ID in that case. Checking if the ID is already assigned 1450 * works, because 0 isn't considered a valid ID and the memory is 1451 * 0-initialized. 1452 */ 1453 if (!wdev->identifier) 1454 wdev->identifier = ++rdev->wdev_id; 1455 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list); 1456 rdev->devlist_generation++; 1457 wdev->registered = true; 1458 1459 if (wdev->netdev && 1460 sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj, 1461 "phy80211")) 1462 pr_err("failed to add phy80211 symlink to netdev!\n"); 1463 1464 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 1465 } 1466 1467 int cfg80211_register_netdevice(struct net_device *dev) 1468 { 1469 struct wireless_dev *wdev = dev->ieee80211_ptr; 1470 struct cfg80211_registered_device *rdev; 1471 int ret; 1472 1473 ASSERT_RTNL(); 1474 1475 if (WARN_ON(!wdev)) 1476 return -EINVAL; 1477 1478 rdev = wiphy_to_rdev(wdev->wiphy); 1479 1480 lockdep_assert_held(&rdev->wiphy.mtx); 1481 1482 /* we'll take care of this */ 1483 wdev->registered = true; 1484 wdev->registering = true; 1485 ret = register_netdevice(dev); 1486 if (ret) 1487 goto out; 1488 1489 cfg80211_register_wdev(rdev, wdev); 1490 ret = 0; 1491 out: 1492 wdev->registering = false; 1493 if (ret) 1494 wdev->registered = false; 1495 return ret; 1496 } 1497 EXPORT_SYMBOL(cfg80211_register_netdevice); 1498 1499 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 1500 unsigned long state, void *ptr) 1501 { 1502 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1503 struct wireless_dev *wdev = dev->ieee80211_ptr; 1504 struct cfg80211_registered_device *rdev; 1505 struct cfg80211_sched_scan_request *pos, *tmp; 1506 1507 if (!wdev) 1508 return NOTIFY_DONE; 1509 1510 rdev = wiphy_to_rdev(wdev->wiphy); 1511 1512 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 1513 1514 switch (state) { 1515 case NETDEV_POST_INIT: 1516 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 1517 wdev->netdev = dev; 1518 /* can only change netns with wiphy */ 1519 dev->netns_local = true; 1520 1521 cfg80211_init_wdev(wdev); 1522 break; 1523 case NETDEV_REGISTER: 1524 if (!wdev->registered) { 1525 guard(wiphy)(&rdev->wiphy); 1526 1527 cfg80211_register_wdev(rdev, wdev); 1528 } 1529 break; 1530 case NETDEV_UNREGISTER: 1531 /* 1532 * It is possible to get NETDEV_UNREGISTER multiple times, 1533 * so check wdev->registered. 1534 */ 1535 if (wdev->registered && !wdev->registering) { 1536 guard(wiphy)(&rdev->wiphy); 1537 1538 _cfg80211_unregister_wdev(wdev, false); 1539 } 1540 break; 1541 case NETDEV_GOING_DOWN: 1542 scoped_guard(wiphy, &rdev->wiphy) { 1543 cfg80211_leave(rdev, wdev); 1544 cfg80211_remove_links(wdev); 1545 } 1546 /* since we just did cfg80211_leave() nothing to do there */ 1547 cancel_work_sync(&wdev->disconnect_wk); 1548 cancel_work_sync(&wdev->pmsr_free_wk); 1549 break; 1550 case NETDEV_DOWN: 1551 wiphy_lock(&rdev->wiphy); 1552 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1553 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1554 if (WARN_ON(!rdev->scan_req->notified && 1555 (!rdev->int_scan_req || 1556 !rdev->int_scan_req->notified))) 1557 rdev->scan_req->info.aborted = true; 1558 ___cfg80211_scan_done(rdev, false); 1559 } 1560 1561 list_for_each_entry_safe(pos, tmp, 1562 &rdev->sched_scan_req_list, list) { 1563 if (WARN_ON(pos->dev == wdev->netdev)) 1564 cfg80211_stop_sched_scan_req(rdev, pos, false); 1565 } 1566 1567 rdev->opencount--; 1568 wiphy_unlock(&rdev->wiphy); 1569 wake_up(&rdev->dev_wait); 1570 break; 1571 case NETDEV_UP: 1572 wiphy_lock(&rdev->wiphy); 1573 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1574 switch (wdev->iftype) { 1575 #ifdef CONFIG_CFG80211_WEXT 1576 case NL80211_IFTYPE_ADHOC: 1577 cfg80211_ibss_wext_join(rdev, wdev); 1578 break; 1579 case NL80211_IFTYPE_STATION: 1580 cfg80211_mgd_wext_connect(rdev, wdev); 1581 break; 1582 #endif 1583 #ifdef CONFIG_MAC80211_MESH 1584 case NL80211_IFTYPE_MESH_POINT: 1585 { 1586 /* backward compat code... */ 1587 struct mesh_setup setup; 1588 memcpy(&setup, &default_mesh_setup, 1589 sizeof(setup)); 1590 /* back compat only needed for mesh_id */ 1591 setup.mesh_id = wdev->u.mesh.id; 1592 setup.mesh_id_len = wdev->u.mesh.id_up_len; 1593 if (wdev->u.mesh.id_up_len) 1594 __cfg80211_join_mesh(rdev, dev, 1595 &setup, 1596 &default_mesh_config); 1597 break; 1598 } 1599 #endif 1600 default: 1601 break; 1602 } 1603 rdev->opencount++; 1604 1605 /* 1606 * Configure power management to the driver here so that its 1607 * correctly set also after interface type changes etc. 1608 */ 1609 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1610 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1611 rdev->ops->set_power_mgmt && 1612 rdev_set_power_mgmt(rdev, dev, wdev->ps, 1613 wdev->ps_timeout)) { 1614 /* assume this means it's off */ 1615 wdev->ps = false; 1616 } 1617 wiphy_unlock(&rdev->wiphy); 1618 break; 1619 case NETDEV_PRE_UP: 1620 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype, 1621 wdev->use_4addr, 0)) 1622 return notifier_from_errno(-EOPNOTSUPP); 1623 1624 if (rfkill_blocked(rdev->wiphy.rfkill)) 1625 return notifier_from_errno(-ERFKILL); 1626 break; 1627 default: 1628 return NOTIFY_DONE; 1629 } 1630 1631 wireless_nlevent_flush(); 1632 1633 return NOTIFY_OK; 1634 } 1635 1636 static struct notifier_block cfg80211_netdev_notifier = { 1637 .notifier_call = cfg80211_netdev_notifier_call, 1638 }; 1639 1640 static void __net_exit cfg80211_pernet_exit(struct net *net) 1641 { 1642 struct cfg80211_registered_device *rdev; 1643 1644 rtnl_lock(); 1645 for_each_rdev(rdev) { 1646 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1647 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1648 } 1649 rtnl_unlock(); 1650 } 1651 1652 static struct pernet_operations cfg80211_pernet_ops = { 1653 .exit = cfg80211_pernet_exit, 1654 }; 1655 1656 void wiphy_work_queue(struct wiphy *wiphy, struct wiphy_work *work) 1657 { 1658 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1659 unsigned long flags; 1660 1661 trace_wiphy_work_queue(wiphy, work); 1662 1663 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1664 if (list_empty(&work->entry)) 1665 list_add_tail(&work->entry, &rdev->wiphy_work_list); 1666 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1667 1668 queue_work(system_unbound_wq, &rdev->wiphy_work); 1669 } 1670 EXPORT_SYMBOL_GPL(wiphy_work_queue); 1671 1672 void wiphy_work_cancel(struct wiphy *wiphy, struct wiphy_work *work) 1673 { 1674 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1675 unsigned long flags; 1676 1677 lockdep_assert_held(&wiphy->mtx); 1678 1679 trace_wiphy_work_cancel(wiphy, work); 1680 1681 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1682 if (!list_empty(&work->entry)) 1683 list_del_init(&work->entry); 1684 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1685 } 1686 EXPORT_SYMBOL_GPL(wiphy_work_cancel); 1687 1688 void wiphy_work_flush(struct wiphy *wiphy, struct wiphy_work *work) 1689 { 1690 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1691 unsigned long flags; 1692 bool run; 1693 1694 trace_wiphy_work_flush(wiphy, work); 1695 1696 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1697 run = !work || !list_empty(&work->entry); 1698 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1699 1700 if (run) 1701 cfg80211_process_wiphy_works(rdev, work); 1702 } 1703 EXPORT_SYMBOL_GPL(wiphy_work_flush); 1704 1705 void wiphy_delayed_work_timer(struct timer_list *t) 1706 { 1707 struct wiphy_delayed_work *dwork = from_timer(dwork, t, timer); 1708 1709 wiphy_work_queue(dwork->wiphy, &dwork->work); 1710 } 1711 EXPORT_SYMBOL(wiphy_delayed_work_timer); 1712 1713 void wiphy_delayed_work_queue(struct wiphy *wiphy, 1714 struct wiphy_delayed_work *dwork, 1715 unsigned long delay) 1716 { 1717 trace_wiphy_delayed_work_queue(wiphy, &dwork->work, delay); 1718 1719 if (!delay) { 1720 del_timer(&dwork->timer); 1721 wiphy_work_queue(wiphy, &dwork->work); 1722 return; 1723 } 1724 1725 dwork->wiphy = wiphy; 1726 mod_timer(&dwork->timer, jiffies + delay); 1727 } 1728 EXPORT_SYMBOL_GPL(wiphy_delayed_work_queue); 1729 1730 void wiphy_delayed_work_cancel(struct wiphy *wiphy, 1731 struct wiphy_delayed_work *dwork) 1732 { 1733 lockdep_assert_held(&wiphy->mtx); 1734 1735 del_timer_sync(&dwork->timer); 1736 wiphy_work_cancel(wiphy, &dwork->work); 1737 } 1738 EXPORT_SYMBOL_GPL(wiphy_delayed_work_cancel); 1739 1740 void wiphy_delayed_work_flush(struct wiphy *wiphy, 1741 struct wiphy_delayed_work *dwork) 1742 { 1743 lockdep_assert_held(&wiphy->mtx); 1744 1745 del_timer_sync(&dwork->timer); 1746 wiphy_work_flush(wiphy, &dwork->work); 1747 } 1748 EXPORT_SYMBOL_GPL(wiphy_delayed_work_flush); 1749 1750 bool wiphy_delayed_work_pending(struct wiphy *wiphy, 1751 struct wiphy_delayed_work *dwork) 1752 { 1753 return timer_pending(&dwork->timer); 1754 } 1755 EXPORT_SYMBOL_GPL(wiphy_delayed_work_pending); 1756 1757 static int __init cfg80211_init(void) 1758 { 1759 int err; 1760 1761 err = register_pernet_device(&cfg80211_pernet_ops); 1762 if (err) 1763 goto out_fail_pernet; 1764 1765 err = wiphy_sysfs_init(); 1766 if (err) 1767 goto out_fail_sysfs; 1768 1769 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1770 if (err) 1771 goto out_fail_notifier; 1772 1773 err = nl80211_init(); 1774 if (err) 1775 goto out_fail_nl80211; 1776 1777 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1778 1779 err = regulatory_init(); 1780 if (err) 1781 goto out_fail_reg; 1782 1783 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM); 1784 if (!cfg80211_wq) { 1785 err = -ENOMEM; 1786 goto out_fail_wq; 1787 } 1788 1789 return 0; 1790 1791 out_fail_wq: 1792 regulatory_exit(); 1793 out_fail_reg: 1794 debugfs_remove(ieee80211_debugfs_dir); 1795 nl80211_exit(); 1796 out_fail_nl80211: 1797 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1798 out_fail_notifier: 1799 wiphy_sysfs_exit(); 1800 out_fail_sysfs: 1801 unregister_pernet_device(&cfg80211_pernet_ops); 1802 out_fail_pernet: 1803 return err; 1804 } 1805 fs_initcall(cfg80211_init); 1806 1807 static void __exit cfg80211_exit(void) 1808 { 1809 debugfs_remove(ieee80211_debugfs_dir); 1810 nl80211_exit(); 1811 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1812 wiphy_sysfs_exit(); 1813 regulatory_exit(); 1814 unregister_pernet_device(&cfg80211_pernet_ops); 1815 destroy_workqueue(cfg80211_wq); 1816 } 1817 module_exit(cfg80211_exit); 1818