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) 2018-2023 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->features &= ~NETIF_F_NETNS_LOCAL; 169 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); 170 if (err) 171 break; 172 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 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->features &= ~NETIF_F_NETNS_LOCAL; 185 err = dev_change_net_namespace(wdev->netdev, net, 186 "wlan%d"); 187 WARN_ON(err); 188 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 189 } 190 191 return err; 192 } 193 194 wiphy_lock(&rdev->wiphy); 195 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 196 if (!wdev->netdev) 197 continue; 198 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 199 } 200 201 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 202 203 wiphy_net_set(&rdev->wiphy, net); 204 205 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev)); 206 WARN_ON(err); 207 208 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 209 210 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 211 if (!wdev->netdev) 212 continue; 213 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 214 } 215 wiphy_unlock(&rdev->wiphy); 216 217 return 0; 218 } 219 220 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data) 221 { 222 struct cfg80211_registered_device *rdev = data; 223 224 wiphy_lock(&rdev->wiphy); 225 rdev_rfkill_poll(rdev); 226 wiphy_unlock(&rdev->wiphy); 227 } 228 229 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev, 230 struct wireless_dev *wdev) 231 { 232 lockdep_assert_held(&rdev->wiphy.mtx); 233 234 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE)) 235 return; 236 237 if (!wdev_running(wdev)) 238 return; 239 240 rdev_stop_p2p_device(rdev, wdev); 241 wdev->is_running = false; 242 243 rdev->opencount--; 244 245 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 246 if (WARN_ON(!rdev->scan_req->notified && 247 (!rdev->int_scan_req || 248 !rdev->int_scan_req->notified))) 249 rdev->scan_req->info.aborted = true; 250 ___cfg80211_scan_done(rdev, false); 251 } 252 } 253 254 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev, 255 struct wireless_dev *wdev) 256 { 257 lockdep_assert_held(&rdev->wiphy.mtx); 258 259 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN)) 260 return; 261 262 if (!wdev_running(wdev)) 263 return; 264 265 rdev_stop_nan(rdev, wdev); 266 wdev->is_running = false; 267 268 rdev->opencount--; 269 } 270 271 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy) 272 { 273 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 274 struct wireless_dev *wdev; 275 276 ASSERT_RTNL(); 277 278 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 279 if (wdev->netdev) { 280 dev_close(wdev->netdev); 281 continue; 282 } 283 284 /* otherwise, check iftype */ 285 286 wiphy_lock(wiphy); 287 288 switch (wdev->iftype) { 289 case NL80211_IFTYPE_P2P_DEVICE: 290 cfg80211_stop_p2p_device(rdev, wdev); 291 break; 292 case NL80211_IFTYPE_NAN: 293 cfg80211_stop_nan(rdev, wdev); 294 break; 295 default: 296 break; 297 } 298 299 wiphy_unlock(wiphy); 300 } 301 } 302 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces); 303 304 static int cfg80211_rfkill_set_block(void *data, bool blocked) 305 { 306 struct cfg80211_registered_device *rdev = data; 307 308 if (!blocked) 309 return 0; 310 311 rtnl_lock(); 312 cfg80211_shutdown_all_interfaces(&rdev->wiphy); 313 rtnl_unlock(); 314 315 return 0; 316 } 317 318 static void cfg80211_rfkill_block_work(struct work_struct *work) 319 { 320 struct cfg80211_registered_device *rdev; 321 322 rdev = container_of(work, struct cfg80211_registered_device, 323 rfkill_block); 324 cfg80211_rfkill_set_block(rdev, true); 325 } 326 327 static void cfg80211_event_work(struct work_struct *work) 328 { 329 struct cfg80211_registered_device *rdev; 330 331 rdev = container_of(work, struct cfg80211_registered_device, 332 event_work); 333 334 wiphy_lock(&rdev->wiphy); 335 cfg80211_process_rdev_events(rdev); 336 wiphy_unlock(&rdev->wiphy); 337 } 338 339 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev) 340 { 341 struct wireless_dev *wdev, *tmp; 342 343 ASSERT_RTNL(); 344 345 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) { 346 if (wdev->nl_owner_dead) { 347 if (wdev->netdev) 348 dev_close(wdev->netdev); 349 350 wiphy_lock(&rdev->wiphy); 351 cfg80211_leave(rdev, wdev); 352 cfg80211_remove_virtual_intf(rdev, wdev); 353 wiphy_unlock(&rdev->wiphy); 354 } 355 } 356 } 357 358 static void cfg80211_destroy_iface_wk(struct work_struct *work) 359 { 360 struct cfg80211_registered_device *rdev; 361 362 rdev = container_of(work, struct cfg80211_registered_device, 363 destroy_work); 364 365 rtnl_lock(); 366 cfg80211_destroy_ifaces(rdev); 367 rtnl_unlock(); 368 } 369 370 static void cfg80211_sched_scan_stop_wk(struct wiphy *wiphy, 371 struct wiphy_work *work) 372 { 373 struct cfg80211_registered_device *rdev; 374 struct cfg80211_sched_scan_request *req, *tmp; 375 376 rdev = container_of(work, struct cfg80211_registered_device, 377 sched_scan_stop_wk); 378 379 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { 380 if (req->nl_owner_dead) 381 cfg80211_stop_sched_scan_req(rdev, req, false); 382 } 383 } 384 385 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work) 386 { 387 struct cfg80211_registered_device *rdev; 388 389 rdev = container_of(work, struct cfg80211_registered_device, 390 propagate_radar_detect_wk); 391 392 rtnl_lock(); 393 394 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef, 395 NL80211_DFS_UNAVAILABLE, 396 NL80211_RADAR_DETECTED); 397 398 rtnl_unlock(); 399 } 400 401 static void cfg80211_propagate_cac_done_wk(struct work_struct *work) 402 { 403 struct cfg80211_registered_device *rdev; 404 405 rdev = container_of(work, struct cfg80211_registered_device, 406 propagate_cac_done_wk); 407 408 rtnl_lock(); 409 410 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef, 411 NL80211_DFS_AVAILABLE, 412 NL80211_RADAR_CAC_FINISHED); 413 414 rtnl_unlock(); 415 } 416 417 static void cfg80211_wiphy_work(struct work_struct *work) 418 { 419 struct cfg80211_registered_device *rdev; 420 struct wiphy_work *wk; 421 422 rdev = container_of(work, struct cfg80211_registered_device, wiphy_work); 423 424 wiphy_lock(&rdev->wiphy); 425 if (rdev->suspended) 426 goto out; 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 schedule_work(work); 435 spin_unlock_irq(&rdev->wiphy_work_lock); 436 437 wk->func(&rdev->wiphy, wk); 438 } else { 439 spin_unlock_irq(&rdev->wiphy_work_lock); 440 } 441 out: 442 wiphy_unlock(&rdev->wiphy); 443 } 444 445 /* exported functions */ 446 447 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, 448 const char *requested_name) 449 { 450 static atomic_t wiphy_counter = ATOMIC_INIT(0); 451 452 struct cfg80211_registered_device *rdev; 453 int alloc_size; 454 455 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 456 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 457 WARN_ON(ops->connect && !ops->disconnect); 458 WARN_ON(ops->join_ibss && !ops->leave_ibss); 459 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 460 WARN_ON(ops->add_station && !ops->del_station); 461 WARN_ON(ops->add_mpath && !ops->del_mpath); 462 WARN_ON(ops->join_mesh && !ops->leave_mesh); 463 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device); 464 WARN_ON(ops->start_ap && !ops->stop_ap); 465 WARN_ON(ops->join_ocb && !ops->leave_ocb); 466 WARN_ON(ops->suspend && !ops->resume); 467 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop); 468 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel); 469 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch); 470 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts); 471 472 alloc_size = sizeof(*rdev) + sizeof_priv; 473 474 rdev = kzalloc(alloc_size, GFP_KERNEL); 475 if (!rdev) 476 return NULL; 477 478 rdev->ops = ops; 479 480 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 481 482 if (unlikely(rdev->wiphy_idx < 0)) { 483 /* ugh, wrapped! */ 484 atomic_dec(&wiphy_counter); 485 kfree(rdev); 486 return NULL; 487 } 488 489 /* atomic_inc_return makes it start at 1, make it start at 0 */ 490 rdev->wiphy_idx--; 491 492 /* give it a proper name */ 493 if (requested_name && requested_name[0]) { 494 int rv; 495 496 rtnl_lock(); 497 rv = cfg80211_dev_check_name(rdev, requested_name); 498 499 if (rv < 0) { 500 rtnl_unlock(); 501 goto use_default_name; 502 } 503 504 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); 505 rtnl_unlock(); 506 if (rv) 507 goto use_default_name; 508 } else { 509 int rv; 510 511 use_default_name: 512 /* NOTE: This is *probably* safe w/out holding rtnl because of 513 * the restrictions on phy names. Probably this call could 514 * fail if some other part of the kernel (re)named a device 515 * phyX. But, might should add some locking and check return 516 * value, and use a different name if this one exists? 517 */ 518 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 519 if (rv < 0) { 520 kfree(rdev); 521 return NULL; 522 } 523 } 524 525 mutex_init(&rdev->wiphy.mtx); 526 INIT_LIST_HEAD(&rdev->wiphy.wdev_list); 527 INIT_LIST_HEAD(&rdev->beacon_registrations); 528 spin_lock_init(&rdev->beacon_registrations_lock); 529 spin_lock_init(&rdev->bss_lock); 530 INIT_LIST_HEAD(&rdev->bss_list); 531 INIT_LIST_HEAD(&rdev->sched_scan_req_list); 532 wiphy_work_init(&rdev->scan_done_wk, __cfg80211_scan_done); 533 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 534 cfg80211_dfs_channels_update_work); 535 #ifdef CONFIG_CFG80211_WEXT 536 rdev->wiphy.wext = &cfg80211_wext_handler; 537 #endif 538 539 device_initialize(&rdev->wiphy.dev); 540 rdev->wiphy.dev.class = &ieee80211_class; 541 rdev->wiphy.dev.platform_data = rdev; 542 device_enable_async_suspend(&rdev->wiphy.dev); 543 544 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 545 wiphy_work_init(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 546 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk); 547 INIT_WORK(&rdev->propagate_radar_detect_wk, 548 cfg80211_propagate_radar_detect_wk); 549 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk); 550 INIT_WORK(&rdev->mgmt_registrations_update_wk, 551 cfg80211_mgmt_registrations_update_wk); 552 spin_lock_init(&rdev->mgmt_registrations_lock); 553 554 #ifdef CONFIG_CFG80211_DEFAULT_PS 555 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 556 #endif 557 558 wiphy_net_set(&rdev->wiphy, &init_net); 559 560 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 561 rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 562 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 563 &rdev->rfkill_ops, rdev); 564 565 if (!rdev->wiphy.rfkill) { 566 wiphy_free(&rdev->wiphy); 567 return NULL; 568 } 569 570 INIT_WORK(&rdev->wiphy_work, cfg80211_wiphy_work); 571 INIT_LIST_HEAD(&rdev->wiphy_work_list); 572 spin_lock_init(&rdev->wiphy_work_lock); 573 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work); 574 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 575 INIT_WORK(&rdev->event_work, cfg80211_event_work); 576 INIT_WORK(&rdev->background_cac_abort_wk, 577 cfg80211_background_cac_abort_wk); 578 INIT_DELAYED_WORK(&rdev->background_cac_done_wk, 579 cfg80211_background_cac_done_wk); 580 581 init_waitqueue_head(&rdev->dev_wait); 582 583 /* 584 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 585 * Fragmentation and RTS threshold are disabled by default with the 586 * special -1 value. 587 */ 588 rdev->wiphy.retry_short = 7; 589 rdev->wiphy.retry_long = 4; 590 rdev->wiphy.frag_threshold = (u32) -1; 591 rdev->wiphy.rts_threshold = (u32) -1; 592 rdev->wiphy.coverage_class = 0; 593 594 rdev->wiphy.max_num_csa_counters = 1; 595 596 rdev->wiphy.max_sched_scan_plans = 1; 597 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 598 599 return &rdev->wiphy; 600 } 601 EXPORT_SYMBOL(wiphy_new_nm); 602 603 static int wiphy_verify_combinations(struct wiphy *wiphy) 604 { 605 const struct ieee80211_iface_combination *c; 606 int i, j; 607 608 for (i = 0; i < wiphy->n_iface_combinations; i++) { 609 u32 cnt = 0; 610 u16 all_iftypes = 0; 611 612 c = &wiphy->iface_combinations[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. */ 626 if (WARN_ON(c->radar_detect_widths && 627 (c->num_different_channels > 1))) 628 return -EINVAL; 629 630 if (WARN_ON(!c->n_limits)) 631 return -EINVAL; 632 633 for (j = 0; j < c->n_limits; j++) { 634 u16 types = c->limits[j].types; 635 636 /* interface types shouldn't overlap */ 637 if (WARN_ON(types & all_iftypes)) 638 return -EINVAL; 639 all_iftypes |= types; 640 641 if (WARN_ON(!c->limits[j].max)) 642 return -EINVAL; 643 644 /* Shouldn't list software iftypes in combinations! */ 645 if (WARN_ON(wiphy->software_iftypes & types)) 646 return -EINVAL; 647 648 /* Only a single P2P_DEVICE can be allowed */ 649 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 650 c->limits[j].max > 1)) 651 return -EINVAL; 652 653 /* Only a single NAN can be allowed */ 654 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) && 655 c->limits[j].max > 1)) 656 return -EINVAL; 657 658 /* 659 * This isn't well-defined right now. If you have an 660 * IBSS interface, then its beacon interval may change 661 * by joining other networks, and nothing prevents it 662 * from doing that. 663 * So technically we probably shouldn't even allow AP 664 * and IBSS in the same interface, but it seems that 665 * some drivers support that, possibly only with fixed 666 * beacon intervals for IBSS. 667 */ 668 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) && 669 c->beacon_int_min_gcd)) { 670 return -EINVAL; 671 } 672 673 cnt += c->limits[j].max; 674 /* 675 * Don't advertise an unsupported type 676 * in a combination. 677 */ 678 if (WARN_ON((wiphy->interface_modes & types) != types)) 679 return -EINVAL; 680 } 681 682 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS))) 683 return -EINVAL; 684 685 /* You can't even choose that many! */ 686 if (WARN_ON(cnt < c->max_interfaces)) 687 return -EINVAL; 688 } 689 690 return 0; 691 } 692 693 int wiphy_register(struct wiphy *wiphy) 694 { 695 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 696 int res; 697 enum nl80211_band band; 698 struct ieee80211_supported_band *sband; 699 bool have_band = false; 700 int i; 701 u16 ifmodes = wiphy->interface_modes; 702 703 #ifdef CONFIG_PM 704 if (WARN_ON(wiphy->wowlan && 705 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 706 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 707 return -EINVAL; 708 if (WARN_ON(wiphy->wowlan && 709 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 710 !wiphy->wowlan->tcp)) 711 return -EINVAL; 712 #endif 713 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 714 (!rdev->ops->tdls_channel_switch || 715 !rdev->ops->tdls_cancel_channel_switch))) 716 return -EINVAL; 717 718 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) && 719 (!rdev->ops->start_nan || !rdev->ops->stop_nan || 720 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func || 721 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ))))) 722 return -EINVAL; 723 724 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))) 725 return -EINVAL; 726 727 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported)) 728 return -EINVAL; 729 730 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) { 731 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap && 732 !wiphy->pmsr_capa->ftm.non_asap)) 733 return -EINVAL; 734 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles || 735 !wiphy->pmsr_capa->ftm.bandwidths)) 736 return -EINVAL; 737 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles & 738 ~(BIT(NL80211_PREAMBLE_LEGACY) | 739 BIT(NL80211_PREAMBLE_HT) | 740 BIT(NL80211_PREAMBLE_VHT) | 741 BIT(NL80211_PREAMBLE_HE) | 742 BIT(NL80211_PREAMBLE_DMG)))) 743 return -EINVAL; 744 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based || 745 wiphy->pmsr_capa->ftm.non_trigger_based) && 746 !(wiphy->pmsr_capa->ftm.preambles & 747 BIT(NL80211_PREAMBLE_HE)))) 748 return -EINVAL; 749 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths & 750 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) | 751 BIT(NL80211_CHAN_WIDTH_20) | 752 BIT(NL80211_CHAN_WIDTH_40) | 753 BIT(NL80211_CHAN_WIDTH_80) | 754 BIT(NL80211_CHAN_WIDTH_80P80) | 755 BIT(NL80211_CHAN_WIDTH_160) | 756 BIT(NL80211_CHAN_WIDTH_5) | 757 BIT(NL80211_CHAN_WIDTH_10)))) 758 return -EINVAL; 759 } 760 761 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 762 (wiphy->regulatory_flags & 763 (REGULATORY_CUSTOM_REG | 764 REGULATORY_STRICT_REG | 765 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 766 REGULATORY_COUNTRY_IE_IGNORE)))) 767 return -EINVAL; 768 769 if (WARN_ON(wiphy->coalesce && 770 (!wiphy->coalesce->n_rules || 771 !wiphy->coalesce->n_patterns) && 772 (!wiphy->coalesce->pattern_min_len || 773 wiphy->coalesce->pattern_min_len > 774 wiphy->coalesce->pattern_max_len))) 775 return -EINVAL; 776 777 if (WARN_ON(wiphy->ap_sme_capa && 778 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 779 return -EINVAL; 780 781 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 782 return -EINVAL; 783 784 if (WARN_ON(wiphy->addresses && 785 !is_zero_ether_addr(wiphy->perm_addr) && 786 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 787 ETH_ALEN))) 788 return -EINVAL; 789 790 if (WARN_ON(wiphy->max_acl_mac_addrs && 791 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 792 !rdev->ops->set_mac_acl))) 793 return -EINVAL; 794 795 /* assure only valid behaviours are flagged by driver 796 * hence subtract 2 as bit 0 is invalid. 797 */ 798 if (WARN_ON(wiphy->bss_select_support && 799 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 800 return -EINVAL; 801 802 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy, 803 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) && 804 (!rdev->ops->set_pmk || !rdev->ops->del_pmk))) 805 return -EINVAL; 806 807 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) && 808 rdev->ops->update_connect_params)) 809 return -EINVAL; 810 811 if (wiphy->addresses) 812 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 813 814 /* sanity check ifmodes */ 815 WARN_ON(!ifmodes); 816 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 817 if (WARN_ON(ifmodes != wiphy->interface_modes)) 818 wiphy->interface_modes = ifmodes; 819 820 res = wiphy_verify_combinations(wiphy); 821 if (res) 822 return res; 823 824 /* sanity check supported bands/channels */ 825 for (band = 0; band < NUM_NL80211_BANDS; band++) { 826 const struct ieee80211_sband_iftype_data *iftd; 827 u16 types = 0; 828 bool have_he = false; 829 830 sband = wiphy->bands[band]; 831 if (!sband) 832 continue; 833 834 sband->band = band; 835 if (WARN_ON(!sband->n_channels)) 836 return -EINVAL; 837 /* 838 * on 60GHz or sub-1Ghz band, there are no legacy rates, so 839 * n_bitrates is 0 840 */ 841 if (WARN_ON((band != NL80211_BAND_60GHZ && 842 band != NL80211_BAND_S1GHZ) && 843 !sband->n_bitrates)) 844 return -EINVAL; 845 846 if (WARN_ON(band == NL80211_BAND_6GHZ && 847 (sband->ht_cap.ht_supported || 848 sband->vht_cap.vht_supported))) 849 return -EINVAL; 850 851 /* 852 * Since cfg80211_disable_40mhz_24ghz is global, we can 853 * modify the sband's ht data even if the driver uses a 854 * global structure for that. 855 */ 856 if (cfg80211_disable_40mhz_24ghz && 857 band == NL80211_BAND_2GHZ && 858 sband->ht_cap.ht_supported) { 859 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 860 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 861 } 862 863 /* 864 * Since we use a u32 for rate bitmaps in 865 * ieee80211_get_response_rate, we cannot 866 * have more than 32 legacy rates. 867 */ 868 if (WARN_ON(sband->n_bitrates > 32)) 869 return -EINVAL; 870 871 for (i = 0; i < sband->n_channels; i++) { 872 sband->channels[i].orig_flags = 873 sband->channels[i].flags; 874 sband->channels[i].orig_mag = INT_MAX; 875 sband->channels[i].orig_mpwr = 876 sband->channels[i].max_power; 877 sband->channels[i].band = band; 878 879 if (WARN_ON(sband->channels[i].freq_offset >= 1000)) 880 return -EINVAL; 881 } 882 883 for_each_sband_iftype_data(sband, i, iftd) { 884 bool has_ap, has_non_ap; 885 u32 ap_bits = BIT(NL80211_IFTYPE_AP) | 886 BIT(NL80211_IFTYPE_P2P_GO); 887 888 if (WARN_ON(!iftd->types_mask)) 889 return -EINVAL; 890 if (WARN_ON(types & iftd->types_mask)) 891 return -EINVAL; 892 893 /* at least one piece of information must be present */ 894 if (WARN_ON(!iftd->he_cap.has_he)) 895 return -EINVAL; 896 897 types |= iftd->types_mask; 898 899 if (i == 0) 900 have_he = iftd->he_cap.has_he; 901 else 902 have_he = have_he && 903 iftd->he_cap.has_he; 904 905 has_ap = iftd->types_mask & ap_bits; 906 has_non_ap = iftd->types_mask & ~ap_bits; 907 908 /* 909 * For EHT 20 MHz STA, the capabilities format differs 910 * but to simplify, don't check 20 MHz but rather check 911 * only if AP and non-AP were mentioned at the same time, 912 * reject if so. 913 */ 914 if (WARN_ON(iftd->eht_cap.has_eht && 915 has_ap && has_non_ap)) 916 return -EINVAL; 917 } 918 919 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ)) 920 return -EINVAL; 921 922 have_band = true; 923 } 924 925 if (!have_band) { 926 WARN_ON(1); 927 return -EINVAL; 928 } 929 930 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) { 931 /* 932 * Validate we have a policy (can be explicitly set to 933 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that 934 * we have at least one of doit/dumpit. 935 */ 936 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy)) 937 return -EINVAL; 938 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit && 939 !rdev->wiphy.vendor_commands[i].dumpit)) 940 return -EINVAL; 941 } 942 943 #ifdef CONFIG_PM 944 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 945 (!rdev->wiphy.wowlan->pattern_min_len || 946 rdev->wiphy.wowlan->pattern_min_len > 947 rdev->wiphy.wowlan->pattern_max_len))) 948 return -EINVAL; 949 #endif 950 951 if (!wiphy->max_num_akm_suites) 952 wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES; 953 else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES || 954 wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES) 955 return -EINVAL; 956 957 /* check and set up bitrates */ 958 ieee80211_set_bitrate_flags(wiphy); 959 960 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 961 962 rtnl_lock(); 963 wiphy_lock(&rdev->wiphy); 964 res = device_add(&rdev->wiphy.dev); 965 if (res) { 966 wiphy_unlock(&rdev->wiphy); 967 rtnl_unlock(); 968 return res; 969 } 970 971 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 972 cfg80211_rdev_list_generation++; 973 974 /* add to debugfs */ 975 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy), 976 ieee80211_debugfs_dir); 977 978 cfg80211_debugfs_rdev_add(rdev); 979 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 980 wiphy_unlock(&rdev->wiphy); 981 982 /* set up regulatory info */ 983 wiphy_regulatory_register(wiphy); 984 985 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 986 struct regulatory_request request; 987 988 request.wiphy_idx = get_wiphy_idx(wiphy); 989 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 990 request.alpha2[0] = '9'; 991 request.alpha2[1] = '9'; 992 993 nl80211_send_reg_change_event(&request); 994 } 995 996 /* Check that nobody globally advertises any capabilities they do not 997 * advertise on all possible interface types. 998 */ 999 if (wiphy->extended_capabilities_len && 1000 wiphy->num_iftype_ext_capab && 1001 wiphy->iftype_ext_capab) { 1002 u8 supported_on_all, j; 1003 const struct wiphy_iftype_ext_capab *capab; 1004 1005 capab = wiphy->iftype_ext_capab; 1006 for (j = 0; j < wiphy->extended_capabilities_len; j++) { 1007 if (capab[0].extended_capabilities_len > j) 1008 supported_on_all = 1009 capab[0].extended_capabilities[j]; 1010 else 1011 supported_on_all = 0x00; 1012 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) { 1013 if (j >= capab[i].extended_capabilities_len) { 1014 supported_on_all = 0x00; 1015 break; 1016 } 1017 supported_on_all &= 1018 capab[i].extended_capabilities[j]; 1019 } 1020 if (WARN_ON(wiphy->extended_capabilities[j] & 1021 ~supported_on_all)) 1022 break; 1023 } 1024 } 1025 1026 rdev->wiphy.registered = true; 1027 rtnl_unlock(); 1028 1029 res = rfkill_register(rdev->wiphy.rfkill); 1030 if (res) { 1031 rfkill_destroy(rdev->wiphy.rfkill); 1032 rdev->wiphy.rfkill = NULL; 1033 wiphy_unregister(&rdev->wiphy); 1034 return res; 1035 } 1036 1037 return 0; 1038 } 1039 EXPORT_SYMBOL(wiphy_register); 1040 1041 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 1042 { 1043 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1044 1045 if (!rdev->ops->rfkill_poll) 1046 return; 1047 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 1048 rfkill_resume_polling(wiphy->rfkill); 1049 } 1050 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 1051 1052 void cfg80211_process_wiphy_works(struct cfg80211_registered_device *rdev, 1053 struct wiphy_work *end) 1054 { 1055 unsigned int runaway_limit = 100; 1056 unsigned long flags; 1057 1058 lockdep_assert_held(&rdev->wiphy.mtx); 1059 1060 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1061 while (!list_empty(&rdev->wiphy_work_list)) { 1062 struct wiphy_work *wk; 1063 1064 wk = list_first_entry(&rdev->wiphy_work_list, 1065 struct wiphy_work, entry); 1066 list_del_init(&wk->entry); 1067 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1068 1069 wk->func(&rdev->wiphy, wk); 1070 1071 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1072 1073 if (wk == end) 1074 break; 1075 1076 if (WARN_ON(--runaway_limit == 0)) 1077 INIT_LIST_HEAD(&rdev->wiphy_work_list); 1078 } 1079 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1080 } 1081 1082 void wiphy_unregister(struct wiphy *wiphy) 1083 { 1084 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1085 1086 wait_event(rdev->dev_wait, ({ 1087 int __count; 1088 wiphy_lock(&rdev->wiphy); 1089 __count = rdev->opencount; 1090 wiphy_unlock(&rdev->wiphy); 1091 __count == 0; })); 1092 1093 if (rdev->wiphy.rfkill) 1094 rfkill_unregister(rdev->wiphy.rfkill); 1095 1096 rtnl_lock(); 1097 wiphy_lock(&rdev->wiphy); 1098 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 1099 rdev->wiphy.registered = false; 1100 1101 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 1102 1103 /* 1104 * First remove the hardware from everywhere, this makes 1105 * it impossible to find from userspace. 1106 */ 1107 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 1108 list_del_rcu(&rdev->list); 1109 synchronize_rcu(); 1110 1111 /* 1112 * If this device got a regulatory hint tell core its 1113 * free to listen now to a new shiny device regulatory hint 1114 */ 1115 wiphy_regulatory_deregister(wiphy); 1116 1117 cfg80211_rdev_list_generation++; 1118 device_del(&rdev->wiphy.dev); 1119 1120 #ifdef CONFIG_PM 1121 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 1122 rdev_set_wakeup(rdev, false); 1123 #endif 1124 1125 /* surely nothing is reachable now, clean up work */ 1126 cfg80211_process_wiphy_works(rdev, NULL); 1127 wiphy_unlock(&rdev->wiphy); 1128 rtnl_unlock(); 1129 1130 /* this has nothing to do now but make sure it's gone */ 1131 cancel_work_sync(&rdev->wiphy_work); 1132 1133 cancel_work_sync(&rdev->conn_work); 1134 flush_work(&rdev->event_work); 1135 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 1136 cancel_delayed_work_sync(&rdev->background_cac_done_wk); 1137 flush_work(&rdev->destroy_work); 1138 flush_work(&rdev->propagate_radar_detect_wk); 1139 flush_work(&rdev->propagate_cac_done_wk); 1140 flush_work(&rdev->mgmt_registrations_update_wk); 1141 flush_work(&rdev->background_cac_abort_wk); 1142 1143 cfg80211_rdev_free_wowlan(rdev); 1144 cfg80211_rdev_free_coalesce(rdev); 1145 } 1146 EXPORT_SYMBOL(wiphy_unregister); 1147 1148 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 1149 { 1150 struct cfg80211_internal_bss *scan, *tmp; 1151 struct cfg80211_beacon_registration *reg, *treg; 1152 rfkill_destroy(rdev->wiphy.rfkill); 1153 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 1154 list_del(®->list); 1155 kfree(reg); 1156 } 1157 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 1158 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 1159 mutex_destroy(&rdev->wiphy.mtx); 1160 1161 /* 1162 * The 'regd' can only be non-NULL if we never finished 1163 * initializing the wiphy and thus never went through the 1164 * unregister path - e.g. in failure scenarios. Thus, it 1165 * cannot have been visible to anyone if non-NULL, so we 1166 * can just free it here. 1167 */ 1168 kfree(rcu_dereference_raw(rdev->wiphy.regd)); 1169 1170 kfree(rdev); 1171 } 1172 1173 void wiphy_free(struct wiphy *wiphy) 1174 { 1175 put_device(&wiphy->dev); 1176 } 1177 EXPORT_SYMBOL(wiphy_free); 1178 1179 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked, 1180 enum rfkill_hard_block_reasons reason) 1181 { 1182 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1183 1184 if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason)) 1185 schedule_work(&rdev->rfkill_block); 1186 } 1187 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason); 1188 1189 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev, 1190 bool unregister_netdev) 1191 { 1192 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1193 struct cfg80211_cqm_config *cqm_config; 1194 unsigned int link_id; 1195 1196 ASSERT_RTNL(); 1197 lockdep_assert_held(&rdev->wiphy.mtx); 1198 1199 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 1200 1201 wdev->registered = false; 1202 1203 if (wdev->netdev) { 1204 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211"); 1205 if (unregister_netdev) 1206 unregister_netdevice(wdev->netdev); 1207 } 1208 1209 list_del_rcu(&wdev->list); 1210 synchronize_net(); 1211 rdev->devlist_generation++; 1212 1213 cfg80211_mlme_purge_registrations(wdev); 1214 1215 switch (wdev->iftype) { 1216 case NL80211_IFTYPE_P2P_DEVICE: 1217 cfg80211_stop_p2p_device(rdev, wdev); 1218 break; 1219 case NL80211_IFTYPE_NAN: 1220 cfg80211_stop_nan(rdev, wdev); 1221 break; 1222 default: 1223 break; 1224 } 1225 1226 #ifdef CONFIG_CFG80211_WEXT 1227 kfree_sensitive(wdev->wext.keys); 1228 wdev->wext.keys = NULL; 1229 #endif 1230 wiphy_work_cancel(wdev->wiphy, &wdev->cqm_rssi_work); 1231 /* deleted from the list, so can't be found from nl80211 any more */ 1232 cqm_config = rcu_access_pointer(wdev->cqm_config); 1233 kfree_rcu(cqm_config, rcu_head); 1234 1235 /* 1236 * Ensure that all events have been processed and 1237 * freed. 1238 */ 1239 cfg80211_process_wdev_events(wdev); 1240 1241 if (wdev->iftype == NL80211_IFTYPE_STATION || 1242 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) { 1243 for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) { 1244 struct cfg80211_internal_bss *curbss; 1245 1246 curbss = wdev->links[link_id].client.current_bss; 1247 1248 if (WARN_ON(curbss)) { 1249 cfg80211_unhold_bss(curbss); 1250 cfg80211_put_bss(wdev->wiphy, &curbss->pub); 1251 wdev->links[link_id].client.current_bss = NULL; 1252 } 1253 } 1254 } 1255 1256 wdev->connected = false; 1257 } 1258 1259 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 1260 { 1261 _cfg80211_unregister_wdev(wdev, true); 1262 } 1263 EXPORT_SYMBOL(cfg80211_unregister_wdev); 1264 1265 static const struct device_type wiphy_type = { 1266 .name = "wlan", 1267 }; 1268 1269 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 1270 enum nl80211_iftype iftype, int num) 1271 { 1272 lockdep_assert_held(&rdev->wiphy.mtx); 1273 1274 rdev->num_running_ifaces += num; 1275 if (iftype == NL80211_IFTYPE_MONITOR) 1276 rdev->num_running_monitor_ifaces += num; 1277 } 1278 1279 void cfg80211_leave(struct cfg80211_registered_device *rdev, 1280 struct wireless_dev *wdev) 1281 { 1282 struct net_device *dev = wdev->netdev; 1283 struct cfg80211_sched_scan_request *pos, *tmp; 1284 1285 lockdep_assert_held(&rdev->wiphy.mtx); 1286 1287 cfg80211_pmsr_wdev_down(wdev); 1288 1289 cfg80211_stop_background_radar_detection(wdev); 1290 1291 switch (wdev->iftype) { 1292 case NL80211_IFTYPE_ADHOC: 1293 cfg80211_leave_ibss(rdev, dev, true); 1294 break; 1295 case NL80211_IFTYPE_P2P_CLIENT: 1296 case NL80211_IFTYPE_STATION: 1297 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, 1298 list) { 1299 if (dev == pos->dev) 1300 cfg80211_stop_sched_scan_req(rdev, pos, false); 1301 } 1302 1303 #ifdef CONFIG_CFG80211_WEXT 1304 kfree(wdev->wext.ie); 1305 wdev->wext.ie = NULL; 1306 wdev->wext.ie_len = 0; 1307 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1308 #endif 1309 cfg80211_disconnect(rdev, dev, 1310 WLAN_REASON_DEAUTH_LEAVING, true); 1311 break; 1312 case NL80211_IFTYPE_MESH_POINT: 1313 cfg80211_leave_mesh(rdev, dev); 1314 break; 1315 case NL80211_IFTYPE_AP: 1316 case NL80211_IFTYPE_P2P_GO: 1317 cfg80211_stop_ap(rdev, dev, -1, true); 1318 break; 1319 case NL80211_IFTYPE_OCB: 1320 cfg80211_leave_ocb(rdev, dev); 1321 break; 1322 case NL80211_IFTYPE_P2P_DEVICE: 1323 case NL80211_IFTYPE_NAN: 1324 /* cannot happen, has no netdev */ 1325 break; 1326 case NL80211_IFTYPE_AP_VLAN: 1327 case NL80211_IFTYPE_MONITOR: 1328 /* nothing to do */ 1329 break; 1330 case NL80211_IFTYPE_UNSPECIFIED: 1331 case NL80211_IFTYPE_WDS: 1332 case NUM_NL80211_IFTYPES: 1333 /* invalid */ 1334 break; 1335 } 1336 } 1337 1338 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 1339 gfp_t gfp) 1340 { 1341 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1342 struct cfg80211_event *ev; 1343 unsigned long flags; 1344 1345 trace_cfg80211_stop_iface(wiphy, wdev); 1346 1347 ev = kzalloc(sizeof(*ev), gfp); 1348 if (!ev) 1349 return; 1350 1351 ev->type = EVENT_STOPPED; 1352 1353 spin_lock_irqsave(&wdev->event_lock, flags); 1354 list_add_tail(&ev->list, &wdev->event_list); 1355 spin_unlock_irqrestore(&wdev->event_lock, flags); 1356 queue_work(cfg80211_wq, &rdev->event_work); 1357 } 1358 EXPORT_SYMBOL(cfg80211_stop_iface); 1359 1360 void cfg80211_init_wdev(struct wireless_dev *wdev) 1361 { 1362 INIT_LIST_HEAD(&wdev->event_list); 1363 spin_lock_init(&wdev->event_lock); 1364 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1365 INIT_LIST_HEAD(&wdev->pmsr_list); 1366 spin_lock_init(&wdev->pmsr_lock); 1367 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk); 1368 1369 #ifdef CONFIG_CFG80211_WEXT 1370 wdev->wext.default_key = -1; 1371 wdev->wext.default_mgmt_key = -1; 1372 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1373 #endif 1374 1375 wiphy_work_init(&wdev->cqm_rssi_work, cfg80211_cqm_rssi_notify_work); 1376 1377 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1378 wdev->ps = true; 1379 else 1380 wdev->ps = false; 1381 /* allow mac80211 to determine the timeout */ 1382 wdev->ps_timeout = -1; 1383 1384 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1385 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1386 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1387 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE; 1388 1389 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk); 1390 } 1391 1392 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev, 1393 struct wireless_dev *wdev) 1394 { 1395 ASSERT_RTNL(); 1396 lockdep_assert_held(&rdev->wiphy.mtx); 1397 1398 /* 1399 * We get here also when the interface changes network namespaces, 1400 * as it's registered into the new one, but we don't want it to 1401 * change ID in that case. Checking if the ID is already assigned 1402 * works, because 0 isn't considered a valid ID and the memory is 1403 * 0-initialized. 1404 */ 1405 if (!wdev->identifier) 1406 wdev->identifier = ++rdev->wdev_id; 1407 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list); 1408 rdev->devlist_generation++; 1409 wdev->registered = true; 1410 1411 if (wdev->netdev && 1412 sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj, 1413 "phy80211")) 1414 pr_err("failed to add phy80211 symlink to netdev!\n"); 1415 1416 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 1417 } 1418 1419 int cfg80211_register_netdevice(struct net_device *dev) 1420 { 1421 struct wireless_dev *wdev = dev->ieee80211_ptr; 1422 struct cfg80211_registered_device *rdev; 1423 int ret; 1424 1425 ASSERT_RTNL(); 1426 1427 if (WARN_ON(!wdev)) 1428 return -EINVAL; 1429 1430 rdev = wiphy_to_rdev(wdev->wiphy); 1431 1432 lockdep_assert_held(&rdev->wiphy.mtx); 1433 1434 /* we'll take care of this */ 1435 wdev->registered = true; 1436 wdev->registering = true; 1437 ret = register_netdevice(dev); 1438 if (ret) 1439 goto out; 1440 1441 cfg80211_register_wdev(rdev, wdev); 1442 ret = 0; 1443 out: 1444 wdev->registering = false; 1445 if (ret) 1446 wdev->registered = false; 1447 return ret; 1448 } 1449 EXPORT_SYMBOL(cfg80211_register_netdevice); 1450 1451 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 1452 unsigned long state, void *ptr) 1453 { 1454 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1455 struct wireless_dev *wdev = dev->ieee80211_ptr; 1456 struct cfg80211_registered_device *rdev; 1457 struct cfg80211_sched_scan_request *pos, *tmp; 1458 1459 if (!wdev) 1460 return NOTIFY_DONE; 1461 1462 rdev = wiphy_to_rdev(wdev->wiphy); 1463 1464 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 1465 1466 switch (state) { 1467 case NETDEV_POST_INIT: 1468 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 1469 wdev->netdev = dev; 1470 /* can only change netns with wiphy */ 1471 dev->features |= NETIF_F_NETNS_LOCAL; 1472 1473 cfg80211_init_wdev(wdev); 1474 break; 1475 case NETDEV_REGISTER: 1476 if (!wdev->registered) { 1477 wiphy_lock(&rdev->wiphy); 1478 cfg80211_register_wdev(rdev, wdev); 1479 wiphy_unlock(&rdev->wiphy); 1480 } 1481 break; 1482 case NETDEV_UNREGISTER: 1483 /* 1484 * It is possible to get NETDEV_UNREGISTER multiple times, 1485 * so check wdev->registered. 1486 */ 1487 if (wdev->registered && !wdev->registering) { 1488 wiphy_lock(&rdev->wiphy); 1489 _cfg80211_unregister_wdev(wdev, false); 1490 wiphy_unlock(&rdev->wiphy); 1491 } 1492 break; 1493 case NETDEV_GOING_DOWN: 1494 wiphy_lock(&rdev->wiphy); 1495 cfg80211_leave(rdev, wdev); 1496 cfg80211_remove_links(wdev); 1497 wiphy_unlock(&rdev->wiphy); 1498 /* since we just did cfg80211_leave() nothing to do there */ 1499 cancel_work_sync(&wdev->disconnect_wk); 1500 cancel_work_sync(&wdev->pmsr_free_wk); 1501 break; 1502 case NETDEV_DOWN: 1503 wiphy_lock(&rdev->wiphy); 1504 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1505 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1506 if (WARN_ON(!rdev->scan_req->notified && 1507 (!rdev->int_scan_req || 1508 !rdev->int_scan_req->notified))) 1509 rdev->scan_req->info.aborted = true; 1510 ___cfg80211_scan_done(rdev, false); 1511 } 1512 1513 list_for_each_entry_safe(pos, tmp, 1514 &rdev->sched_scan_req_list, list) { 1515 if (WARN_ON(pos->dev == wdev->netdev)) 1516 cfg80211_stop_sched_scan_req(rdev, pos, false); 1517 } 1518 1519 rdev->opencount--; 1520 wiphy_unlock(&rdev->wiphy); 1521 wake_up(&rdev->dev_wait); 1522 break; 1523 case NETDEV_UP: 1524 wiphy_lock(&rdev->wiphy); 1525 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1526 switch (wdev->iftype) { 1527 #ifdef CONFIG_CFG80211_WEXT 1528 case NL80211_IFTYPE_ADHOC: 1529 cfg80211_ibss_wext_join(rdev, wdev); 1530 break; 1531 case NL80211_IFTYPE_STATION: 1532 cfg80211_mgd_wext_connect(rdev, wdev); 1533 break; 1534 #endif 1535 #ifdef CONFIG_MAC80211_MESH 1536 case NL80211_IFTYPE_MESH_POINT: 1537 { 1538 /* backward compat code... */ 1539 struct mesh_setup setup; 1540 memcpy(&setup, &default_mesh_setup, 1541 sizeof(setup)); 1542 /* back compat only needed for mesh_id */ 1543 setup.mesh_id = wdev->u.mesh.id; 1544 setup.mesh_id_len = wdev->u.mesh.id_up_len; 1545 if (wdev->u.mesh.id_up_len) 1546 __cfg80211_join_mesh(rdev, dev, 1547 &setup, 1548 &default_mesh_config); 1549 break; 1550 } 1551 #endif 1552 default: 1553 break; 1554 } 1555 rdev->opencount++; 1556 1557 /* 1558 * Configure power management to the driver here so that its 1559 * correctly set also after interface type changes etc. 1560 */ 1561 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1562 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1563 rdev->ops->set_power_mgmt && 1564 rdev_set_power_mgmt(rdev, dev, wdev->ps, 1565 wdev->ps_timeout)) { 1566 /* assume this means it's off */ 1567 wdev->ps = false; 1568 } 1569 wiphy_unlock(&rdev->wiphy); 1570 break; 1571 case NETDEV_PRE_UP: 1572 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype, 1573 wdev->use_4addr, 0)) 1574 return notifier_from_errno(-EOPNOTSUPP); 1575 1576 if (rfkill_blocked(rdev->wiphy.rfkill)) 1577 return notifier_from_errno(-ERFKILL); 1578 break; 1579 default: 1580 return NOTIFY_DONE; 1581 } 1582 1583 wireless_nlevent_flush(); 1584 1585 return NOTIFY_OK; 1586 } 1587 1588 static struct notifier_block cfg80211_netdev_notifier = { 1589 .notifier_call = cfg80211_netdev_notifier_call, 1590 }; 1591 1592 static void __net_exit cfg80211_pernet_exit(struct net *net) 1593 { 1594 struct cfg80211_registered_device *rdev; 1595 1596 rtnl_lock(); 1597 for_each_rdev(rdev) { 1598 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1599 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1600 } 1601 rtnl_unlock(); 1602 } 1603 1604 static struct pernet_operations cfg80211_pernet_ops = { 1605 .exit = cfg80211_pernet_exit, 1606 }; 1607 1608 void wiphy_work_queue(struct wiphy *wiphy, struct wiphy_work *work) 1609 { 1610 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1611 unsigned long flags; 1612 1613 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1614 if (list_empty(&work->entry)) 1615 list_add_tail(&work->entry, &rdev->wiphy_work_list); 1616 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1617 1618 queue_work(system_unbound_wq, &rdev->wiphy_work); 1619 } 1620 EXPORT_SYMBOL_GPL(wiphy_work_queue); 1621 1622 void wiphy_work_cancel(struct wiphy *wiphy, struct wiphy_work *work) 1623 { 1624 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1625 unsigned long flags; 1626 1627 lockdep_assert_held(&wiphy->mtx); 1628 1629 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1630 if (!list_empty(&work->entry)) 1631 list_del_init(&work->entry); 1632 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1633 } 1634 EXPORT_SYMBOL_GPL(wiphy_work_cancel); 1635 1636 void wiphy_work_flush(struct wiphy *wiphy, struct wiphy_work *work) 1637 { 1638 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1639 unsigned long flags; 1640 bool run; 1641 1642 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1643 run = !work || !list_empty(&work->entry); 1644 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1645 1646 if (run) 1647 cfg80211_process_wiphy_works(rdev, work); 1648 } 1649 EXPORT_SYMBOL_GPL(wiphy_work_flush); 1650 1651 void wiphy_delayed_work_timer(struct timer_list *t) 1652 { 1653 struct wiphy_delayed_work *dwork = from_timer(dwork, t, timer); 1654 1655 wiphy_work_queue(dwork->wiphy, &dwork->work); 1656 } 1657 EXPORT_SYMBOL(wiphy_delayed_work_timer); 1658 1659 void wiphy_delayed_work_queue(struct wiphy *wiphy, 1660 struct wiphy_delayed_work *dwork, 1661 unsigned long delay) 1662 { 1663 if (!delay) { 1664 wiphy_work_queue(wiphy, &dwork->work); 1665 return; 1666 } 1667 1668 dwork->wiphy = wiphy; 1669 mod_timer(&dwork->timer, jiffies + delay); 1670 } 1671 EXPORT_SYMBOL_GPL(wiphy_delayed_work_queue); 1672 1673 void wiphy_delayed_work_cancel(struct wiphy *wiphy, 1674 struct wiphy_delayed_work *dwork) 1675 { 1676 lockdep_assert_held(&wiphy->mtx); 1677 1678 del_timer_sync(&dwork->timer); 1679 wiphy_work_cancel(wiphy, &dwork->work); 1680 } 1681 EXPORT_SYMBOL_GPL(wiphy_delayed_work_cancel); 1682 1683 void wiphy_delayed_work_flush(struct wiphy *wiphy, 1684 struct wiphy_delayed_work *dwork) 1685 { 1686 lockdep_assert_held(&wiphy->mtx); 1687 1688 del_timer_sync(&dwork->timer); 1689 wiphy_work_flush(wiphy, &dwork->work); 1690 } 1691 EXPORT_SYMBOL_GPL(wiphy_delayed_work_flush); 1692 1693 static int __init cfg80211_init(void) 1694 { 1695 int err; 1696 1697 err = register_pernet_device(&cfg80211_pernet_ops); 1698 if (err) 1699 goto out_fail_pernet; 1700 1701 err = wiphy_sysfs_init(); 1702 if (err) 1703 goto out_fail_sysfs; 1704 1705 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1706 if (err) 1707 goto out_fail_notifier; 1708 1709 err = nl80211_init(); 1710 if (err) 1711 goto out_fail_nl80211; 1712 1713 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1714 1715 err = regulatory_init(); 1716 if (err) 1717 goto out_fail_reg; 1718 1719 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM); 1720 if (!cfg80211_wq) { 1721 err = -ENOMEM; 1722 goto out_fail_wq; 1723 } 1724 1725 return 0; 1726 1727 out_fail_wq: 1728 regulatory_exit(); 1729 out_fail_reg: 1730 debugfs_remove(ieee80211_debugfs_dir); 1731 nl80211_exit(); 1732 out_fail_nl80211: 1733 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1734 out_fail_notifier: 1735 wiphy_sysfs_exit(); 1736 out_fail_sysfs: 1737 unregister_pernet_device(&cfg80211_pernet_ops); 1738 out_fail_pernet: 1739 return err; 1740 } 1741 fs_initcall(cfg80211_init); 1742 1743 static void __exit cfg80211_exit(void) 1744 { 1745 debugfs_remove(ieee80211_debugfs_dir); 1746 nl80211_exit(); 1747 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1748 wiphy_sysfs_exit(); 1749 regulatory_exit(); 1750 unregister_pernet_device(&cfg80211_pernet_ops); 1751 destroy_workqueue(cfg80211_wq); 1752 } 1753 module_exit(cfg80211_exit); 1754