1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * This is the linux wireless configuration interface. 4 * 5 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net> 6 * Copyright 2013-2014 Intel Mobile Communications GmbH 7 * Copyright 2015-2017 Intel Deutschland GmbH 8 * Copyright (C) 2018-2022 Intel Corporation 9 */ 10 11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 12 13 #include <linux/if.h> 14 #include <linux/module.h> 15 #include <linux/err.h> 16 #include <linux/list.h> 17 #include <linux/slab.h> 18 #include <linux/nl80211.h> 19 #include <linux/debugfs.h> 20 #include <linux/notifier.h> 21 #include <linux/device.h> 22 #include <linux/etherdevice.h> 23 #include <linux/rtnetlink.h> 24 #include <linux/sched.h> 25 #include <net/genetlink.h> 26 #include <net/cfg80211.h> 27 #include "nl80211.h" 28 #include "core.h" 29 #include "sysfs.h" 30 #include "debugfs.h" 31 #include "wext-compat.h" 32 #include "rdev-ops.h" 33 34 /* name for sysfs, %d is appended */ 35 #define PHY_NAME "phy" 36 37 MODULE_AUTHOR("Johannes Berg"); 38 MODULE_LICENSE("GPL"); 39 MODULE_DESCRIPTION("wireless configuration support"); 40 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME); 41 42 /* RCU-protected (and RTNL for writers) */ 43 LIST_HEAD(cfg80211_rdev_list); 44 int cfg80211_rdev_list_generation; 45 46 /* for debugfs */ 47 static struct dentry *ieee80211_debugfs_dir; 48 49 /* for the cleanup, scan and event works */ 50 struct workqueue_struct *cfg80211_wq; 51 52 static bool cfg80211_disable_40mhz_24ghz; 53 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644); 54 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz, 55 "Disable 40MHz support in the 2.4GHz band"); 56 57 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx) 58 { 59 struct cfg80211_registered_device *result = NULL, *rdev; 60 61 ASSERT_RTNL(); 62 63 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 64 if (rdev->wiphy_idx == wiphy_idx) { 65 result = rdev; 66 break; 67 } 68 } 69 70 return result; 71 } 72 73 int get_wiphy_idx(struct wiphy *wiphy) 74 { 75 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 76 77 return rdev->wiphy_idx; 78 } 79 80 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx) 81 { 82 struct cfg80211_registered_device *rdev; 83 84 ASSERT_RTNL(); 85 86 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx); 87 if (!rdev) 88 return NULL; 89 return &rdev->wiphy; 90 } 91 92 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev, 93 const char *newname) 94 { 95 struct cfg80211_registered_device *rdev2; 96 int wiphy_idx, taken = -1, digits; 97 98 ASSERT_RTNL(); 99 100 if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN) 101 return -EINVAL; 102 103 /* prohibit calling the thing phy%d when %d is not its number */ 104 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken); 105 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) { 106 /* count number of places needed to print wiphy_idx */ 107 digits = 1; 108 while (wiphy_idx /= 10) 109 digits++; 110 /* 111 * deny the name if it is phy<idx> where <idx> is printed 112 * without leading zeroes. taken == strlen(newname) here 113 */ 114 if (taken == strlen(PHY_NAME) + digits) 115 return -EINVAL; 116 } 117 118 /* Ensure another device does not already have this name. */ 119 list_for_each_entry(rdev2, &cfg80211_rdev_list, list) 120 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0) 121 return -EINVAL; 122 123 return 0; 124 } 125 126 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, 127 char *newname) 128 { 129 int result; 130 131 ASSERT_RTNL(); 132 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 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 195 if (!wdev->netdev) 196 continue; 197 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 198 } 199 200 wiphy_lock(&rdev->wiphy); 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 wiphy_unlock(&rdev->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 rdev_rfkill_poll(rdev); 225 } 226 227 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev, 228 struct wireless_dev *wdev) 229 { 230 lockdep_assert_held(&rdev->wiphy.mtx); 231 232 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE)) 233 return; 234 235 if (!wdev_running(wdev)) 236 return; 237 238 rdev_stop_p2p_device(rdev, wdev); 239 wdev->is_running = false; 240 241 rdev->opencount--; 242 243 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 244 if (WARN_ON(!rdev->scan_req->notified && 245 (!rdev->int_scan_req || 246 !rdev->int_scan_req->notified))) 247 rdev->scan_req->info.aborted = true; 248 ___cfg80211_scan_done(rdev, false); 249 } 250 } 251 252 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev, 253 struct wireless_dev *wdev) 254 { 255 lockdep_assert_held(&rdev->wiphy.mtx); 256 257 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN)) 258 return; 259 260 if (!wdev_running(wdev)) 261 return; 262 263 rdev_stop_nan(rdev, wdev); 264 wdev->is_running = false; 265 266 rdev->opencount--; 267 } 268 269 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy) 270 { 271 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 272 struct wireless_dev *wdev; 273 274 ASSERT_RTNL(); 275 276 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 277 if (wdev->netdev) { 278 dev_close(wdev->netdev); 279 continue; 280 } 281 282 /* otherwise, check iftype */ 283 284 wiphy_lock(wiphy); 285 286 switch (wdev->iftype) { 287 case NL80211_IFTYPE_P2P_DEVICE: 288 cfg80211_stop_p2p_device(rdev, wdev); 289 break; 290 case NL80211_IFTYPE_NAN: 291 cfg80211_stop_nan(rdev, wdev); 292 break; 293 default: 294 break; 295 } 296 297 wiphy_unlock(wiphy); 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 wiphy_lock(&rdev->wiphy); 333 cfg80211_process_rdev_events(rdev); 334 wiphy_unlock(&rdev->wiphy); 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 wiphy_lock(&rdev->wiphy); 349 cfg80211_leave(rdev, wdev); 350 cfg80211_remove_virtual_intf(rdev, wdev); 351 wiphy_unlock(&rdev->wiphy); 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 wiphy_lock(&rdev->wiphy); 423 if (rdev->suspended) 424 goto out; 425 426 spin_lock_irq(&rdev->wiphy_work_lock); 427 wk = list_first_entry_or_null(&rdev->wiphy_work_list, 428 struct wiphy_work, entry); 429 if (wk) { 430 list_del_init(&wk->entry); 431 if (!list_empty(&rdev->wiphy_work_list)) 432 schedule_work(work); 433 spin_unlock_irq(&rdev->wiphy_work_lock); 434 435 wk->func(&rdev->wiphy, wk); 436 } else { 437 spin_unlock_irq(&rdev->wiphy_work_lock); 438 } 439 out: 440 wiphy_unlock(&rdev->wiphy); 441 } 442 443 /* exported functions */ 444 445 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, 446 const char *requested_name) 447 { 448 static atomic_t wiphy_counter = ATOMIC_INIT(0); 449 450 struct cfg80211_registered_device *rdev; 451 int alloc_size; 452 453 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 454 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 455 WARN_ON(ops->connect && !ops->disconnect); 456 WARN_ON(ops->join_ibss && !ops->leave_ibss); 457 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 458 WARN_ON(ops->add_station && !ops->del_station); 459 WARN_ON(ops->add_mpath && !ops->del_mpath); 460 WARN_ON(ops->join_mesh && !ops->leave_mesh); 461 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device); 462 WARN_ON(ops->start_ap && !ops->stop_ap); 463 WARN_ON(ops->join_ocb && !ops->leave_ocb); 464 WARN_ON(ops->suspend && !ops->resume); 465 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop); 466 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel); 467 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch); 468 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts); 469 470 alloc_size = sizeof(*rdev) + sizeof_priv; 471 472 rdev = kzalloc(alloc_size, GFP_KERNEL); 473 if (!rdev) 474 return NULL; 475 476 rdev->ops = ops; 477 478 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 479 480 if (unlikely(rdev->wiphy_idx < 0)) { 481 /* ugh, wrapped! */ 482 atomic_dec(&wiphy_counter); 483 kfree(rdev); 484 return NULL; 485 } 486 487 /* atomic_inc_return makes it start at 1, make it start at 0 */ 488 rdev->wiphy_idx--; 489 490 /* give it a proper name */ 491 if (requested_name && requested_name[0]) { 492 int rv; 493 494 rtnl_lock(); 495 rv = cfg80211_dev_check_name(rdev, requested_name); 496 497 if (rv < 0) { 498 rtnl_unlock(); 499 goto use_default_name; 500 } 501 502 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); 503 rtnl_unlock(); 504 if (rv) 505 goto use_default_name; 506 } else { 507 int rv; 508 509 use_default_name: 510 /* NOTE: This is *probably* safe w/out holding rtnl because of 511 * the restrictions on phy names. Probably this call could 512 * fail if some other part of the kernel (re)named a device 513 * phyX. But, might should add some locking and check return 514 * value, and use a different name if this one exists? 515 */ 516 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 517 if (rv < 0) { 518 kfree(rdev); 519 return NULL; 520 } 521 } 522 523 mutex_init(&rdev->wiphy.mtx); 524 INIT_LIST_HEAD(&rdev->wiphy.wdev_list); 525 INIT_LIST_HEAD(&rdev->beacon_registrations); 526 spin_lock_init(&rdev->beacon_registrations_lock); 527 spin_lock_init(&rdev->bss_lock); 528 INIT_LIST_HEAD(&rdev->bss_list); 529 INIT_LIST_HEAD(&rdev->sched_scan_req_list); 530 wiphy_work_init(&rdev->scan_done_wk, __cfg80211_scan_done); 531 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 532 cfg80211_dfs_channels_update_work); 533 #ifdef CONFIG_CFG80211_WEXT 534 rdev->wiphy.wext = &cfg80211_wext_handler; 535 #endif 536 537 device_initialize(&rdev->wiphy.dev); 538 rdev->wiphy.dev.class = &ieee80211_class; 539 rdev->wiphy.dev.platform_data = rdev; 540 device_enable_async_suspend(&rdev->wiphy.dev); 541 542 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 543 wiphy_work_init(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 544 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk); 545 INIT_WORK(&rdev->propagate_radar_detect_wk, 546 cfg80211_propagate_radar_detect_wk); 547 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk); 548 INIT_WORK(&rdev->mgmt_registrations_update_wk, 549 cfg80211_mgmt_registrations_update_wk); 550 spin_lock_init(&rdev->mgmt_registrations_lock); 551 552 #ifdef CONFIG_CFG80211_DEFAULT_PS 553 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 554 #endif 555 556 wiphy_net_set(&rdev->wiphy, &init_net); 557 558 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 559 rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 560 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 561 &rdev->rfkill_ops, rdev); 562 563 if (!rdev->wiphy.rfkill) { 564 wiphy_free(&rdev->wiphy); 565 return NULL; 566 } 567 568 INIT_WORK(&rdev->wiphy_work, cfg80211_wiphy_work); 569 INIT_LIST_HEAD(&rdev->wiphy_work_list); 570 spin_lock_init(&rdev->wiphy_work_lock); 571 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work); 572 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 573 INIT_WORK(&rdev->event_work, cfg80211_event_work); 574 INIT_WORK(&rdev->background_cac_abort_wk, 575 cfg80211_background_cac_abort_wk); 576 INIT_DELAYED_WORK(&rdev->background_cac_done_wk, 577 cfg80211_background_cac_done_wk); 578 579 init_waitqueue_head(&rdev->dev_wait); 580 581 /* 582 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 583 * Fragmentation and RTS threshold are disabled by default with the 584 * special -1 value. 585 */ 586 rdev->wiphy.retry_short = 7; 587 rdev->wiphy.retry_long = 4; 588 rdev->wiphy.frag_threshold = (u32) -1; 589 rdev->wiphy.rts_threshold = (u32) -1; 590 rdev->wiphy.coverage_class = 0; 591 592 rdev->wiphy.max_num_csa_counters = 1; 593 594 rdev->wiphy.max_sched_scan_plans = 1; 595 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 596 597 return &rdev->wiphy; 598 } 599 EXPORT_SYMBOL(wiphy_new_nm); 600 601 static int wiphy_verify_combinations(struct wiphy *wiphy) 602 { 603 const struct ieee80211_iface_combination *c; 604 int i, j; 605 606 for (i = 0; i < wiphy->n_iface_combinations; i++) { 607 u32 cnt = 0; 608 u16 all_iftypes = 0; 609 610 c = &wiphy->iface_combinations[i]; 611 612 /* 613 * Combinations with just one interface aren't real, 614 * however we make an exception for DFS. 615 */ 616 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 617 return -EINVAL; 618 619 /* Need at least one channel */ 620 if (WARN_ON(!c->num_different_channels)) 621 return -EINVAL; 622 623 /* DFS only works on one channel. */ 624 if (WARN_ON(c->radar_detect_widths && 625 (c->num_different_channels > 1))) 626 return -EINVAL; 627 628 if (WARN_ON(!c->n_limits)) 629 return -EINVAL; 630 631 for (j = 0; j < c->n_limits; j++) { 632 u16 types = c->limits[j].types; 633 634 /* interface types shouldn't overlap */ 635 if (WARN_ON(types & all_iftypes)) 636 return -EINVAL; 637 all_iftypes |= types; 638 639 if (WARN_ON(!c->limits[j].max)) 640 return -EINVAL; 641 642 /* Shouldn't list software iftypes in combinations! */ 643 if (WARN_ON(wiphy->software_iftypes & types)) 644 return -EINVAL; 645 646 /* Only a single P2P_DEVICE can be allowed */ 647 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 648 c->limits[j].max > 1)) 649 return -EINVAL; 650 651 /* Only a single NAN can be allowed */ 652 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) && 653 c->limits[j].max > 1)) 654 return -EINVAL; 655 656 /* 657 * This isn't well-defined right now. If you have an 658 * IBSS interface, then its beacon interval may change 659 * by joining other networks, and nothing prevents it 660 * from doing that. 661 * So technically we probably shouldn't even allow AP 662 * and IBSS in the same interface, but it seems that 663 * some drivers support that, possibly only with fixed 664 * beacon intervals for IBSS. 665 */ 666 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) && 667 c->beacon_int_min_gcd)) { 668 return -EINVAL; 669 } 670 671 cnt += c->limits[j].max; 672 /* 673 * Don't advertise an unsupported type 674 * in a combination. 675 */ 676 if (WARN_ON((wiphy->interface_modes & types) != types)) 677 return -EINVAL; 678 } 679 680 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS))) 681 return -EINVAL; 682 683 /* You can't even choose that many! */ 684 if (WARN_ON(cnt < c->max_interfaces)) 685 return -EINVAL; 686 } 687 688 return 0; 689 } 690 691 int wiphy_register(struct wiphy *wiphy) 692 { 693 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 694 int res; 695 enum nl80211_band band; 696 struct ieee80211_supported_band *sband; 697 bool have_band = false; 698 int i; 699 u16 ifmodes = wiphy->interface_modes; 700 701 #ifdef CONFIG_PM 702 if (WARN_ON(wiphy->wowlan && 703 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 704 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 705 return -EINVAL; 706 if (WARN_ON(wiphy->wowlan && 707 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 708 !wiphy->wowlan->tcp)) 709 return -EINVAL; 710 #endif 711 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 712 (!rdev->ops->tdls_channel_switch || 713 !rdev->ops->tdls_cancel_channel_switch))) 714 return -EINVAL; 715 716 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) && 717 (!rdev->ops->start_nan || !rdev->ops->stop_nan || 718 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func || 719 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ))))) 720 return -EINVAL; 721 722 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))) 723 return -EINVAL; 724 725 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported)) 726 return -EINVAL; 727 728 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) { 729 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap && 730 !wiphy->pmsr_capa->ftm.non_asap)) 731 return -EINVAL; 732 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles || 733 !wiphy->pmsr_capa->ftm.bandwidths)) 734 return -EINVAL; 735 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles & 736 ~(BIT(NL80211_PREAMBLE_LEGACY) | 737 BIT(NL80211_PREAMBLE_HT) | 738 BIT(NL80211_PREAMBLE_VHT) | 739 BIT(NL80211_PREAMBLE_HE) | 740 BIT(NL80211_PREAMBLE_DMG)))) 741 return -EINVAL; 742 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based || 743 wiphy->pmsr_capa->ftm.non_trigger_based) && 744 !(wiphy->pmsr_capa->ftm.preambles & 745 BIT(NL80211_PREAMBLE_HE)))) 746 return -EINVAL; 747 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths & 748 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) | 749 BIT(NL80211_CHAN_WIDTH_20) | 750 BIT(NL80211_CHAN_WIDTH_40) | 751 BIT(NL80211_CHAN_WIDTH_80) | 752 BIT(NL80211_CHAN_WIDTH_80P80) | 753 BIT(NL80211_CHAN_WIDTH_160) | 754 BIT(NL80211_CHAN_WIDTH_5) | 755 BIT(NL80211_CHAN_WIDTH_10)))) 756 return -EINVAL; 757 } 758 759 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 760 (wiphy->regulatory_flags & 761 (REGULATORY_CUSTOM_REG | 762 REGULATORY_STRICT_REG | 763 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 764 REGULATORY_COUNTRY_IE_IGNORE)))) 765 return -EINVAL; 766 767 if (WARN_ON(wiphy->coalesce && 768 (!wiphy->coalesce->n_rules || 769 !wiphy->coalesce->n_patterns) && 770 (!wiphy->coalesce->pattern_min_len || 771 wiphy->coalesce->pattern_min_len > 772 wiphy->coalesce->pattern_max_len))) 773 return -EINVAL; 774 775 if (WARN_ON(wiphy->ap_sme_capa && 776 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 777 return -EINVAL; 778 779 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 780 return -EINVAL; 781 782 if (WARN_ON(wiphy->addresses && 783 !is_zero_ether_addr(wiphy->perm_addr) && 784 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 785 ETH_ALEN))) 786 return -EINVAL; 787 788 if (WARN_ON(wiphy->max_acl_mac_addrs && 789 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 790 !rdev->ops->set_mac_acl))) 791 return -EINVAL; 792 793 /* assure only valid behaviours are flagged by driver 794 * hence subtract 2 as bit 0 is invalid. 795 */ 796 if (WARN_ON(wiphy->bss_select_support && 797 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 798 return -EINVAL; 799 800 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy, 801 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) && 802 (!rdev->ops->set_pmk || !rdev->ops->del_pmk))) 803 return -EINVAL; 804 805 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) && 806 rdev->ops->update_connect_params)) 807 return -EINVAL; 808 809 if (wiphy->addresses) 810 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 811 812 /* sanity check ifmodes */ 813 WARN_ON(!ifmodes); 814 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 815 if (WARN_ON(ifmodes != wiphy->interface_modes)) 816 wiphy->interface_modes = ifmodes; 817 818 res = wiphy_verify_combinations(wiphy); 819 if (res) 820 return res; 821 822 /* sanity check supported bands/channels */ 823 for (band = 0; band < NUM_NL80211_BANDS; band++) { 824 u16 types = 0; 825 bool have_he = false; 826 827 sband = wiphy->bands[band]; 828 if (!sband) 829 continue; 830 831 sband->band = band; 832 if (WARN_ON(!sband->n_channels)) 833 return -EINVAL; 834 /* 835 * on 60GHz or sub-1Ghz band, there are no legacy rates, so 836 * n_bitrates is 0 837 */ 838 if (WARN_ON((band != NL80211_BAND_60GHZ && 839 band != NL80211_BAND_S1GHZ) && 840 !sband->n_bitrates)) 841 return -EINVAL; 842 843 if (WARN_ON(band == NL80211_BAND_6GHZ && 844 (sband->ht_cap.ht_supported || 845 sband->vht_cap.vht_supported))) 846 return -EINVAL; 847 848 /* 849 * Since cfg80211_disable_40mhz_24ghz is global, we can 850 * modify the sband's ht data even if the driver uses a 851 * global structure for that. 852 */ 853 if (cfg80211_disable_40mhz_24ghz && 854 band == NL80211_BAND_2GHZ && 855 sband->ht_cap.ht_supported) { 856 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 857 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 858 } 859 860 /* 861 * Since we use a u32 for rate bitmaps in 862 * ieee80211_get_response_rate, we cannot 863 * have more than 32 legacy rates. 864 */ 865 if (WARN_ON(sband->n_bitrates > 32)) 866 return -EINVAL; 867 868 for (i = 0; i < sband->n_channels; i++) { 869 sband->channels[i].orig_flags = 870 sband->channels[i].flags; 871 sband->channels[i].orig_mag = INT_MAX; 872 sband->channels[i].orig_mpwr = 873 sband->channels[i].max_power; 874 sband->channels[i].band = band; 875 876 if (WARN_ON(sband->channels[i].freq_offset >= 1000)) 877 return -EINVAL; 878 } 879 880 for (i = 0; i < sband->n_iftype_data; i++) { 881 const struct ieee80211_sband_iftype_data *iftd; 882 bool has_ap, has_non_ap; 883 u32 ap_bits = BIT(NL80211_IFTYPE_AP) | 884 BIT(NL80211_IFTYPE_P2P_GO); 885 886 iftd = &sband->iftype_data[i]; 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 { 1054 unsigned int runaway_limit = 100; 1055 unsigned long flags; 1056 1057 lockdep_assert_held(&rdev->wiphy.mtx); 1058 1059 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1060 while (!list_empty(&rdev->wiphy_work_list)) { 1061 struct wiphy_work *wk; 1062 1063 wk = list_first_entry(&rdev->wiphy_work_list, 1064 struct wiphy_work, entry); 1065 list_del_init(&wk->entry); 1066 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1067 1068 wk->func(&rdev->wiphy, wk); 1069 1070 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1071 if (WARN_ON(--runaway_limit == 0)) 1072 INIT_LIST_HEAD(&rdev->wiphy_work_list); 1073 } 1074 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1075 } 1076 1077 void wiphy_unregister(struct wiphy *wiphy) 1078 { 1079 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1080 1081 wait_event(rdev->dev_wait, ({ 1082 int __count; 1083 wiphy_lock(&rdev->wiphy); 1084 __count = rdev->opencount; 1085 wiphy_unlock(&rdev->wiphy); 1086 __count == 0; })); 1087 1088 if (rdev->wiphy.rfkill) 1089 rfkill_unregister(rdev->wiphy.rfkill); 1090 1091 rtnl_lock(); 1092 wiphy_lock(&rdev->wiphy); 1093 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 1094 rdev->wiphy.registered = false; 1095 1096 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 1097 1098 /* 1099 * First remove the hardware from everywhere, this makes 1100 * it impossible to find from userspace. 1101 */ 1102 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 1103 list_del_rcu(&rdev->list); 1104 synchronize_rcu(); 1105 1106 /* 1107 * If this device got a regulatory hint tell core its 1108 * free to listen now to a new shiny device regulatory hint 1109 */ 1110 wiphy_regulatory_deregister(wiphy); 1111 1112 cfg80211_rdev_list_generation++; 1113 device_del(&rdev->wiphy.dev); 1114 1115 #ifdef CONFIG_PM 1116 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 1117 rdev_set_wakeup(rdev, false); 1118 #endif 1119 1120 /* surely nothing is reachable now, clean up work */ 1121 cfg80211_process_wiphy_works(rdev); 1122 wiphy_unlock(&rdev->wiphy); 1123 rtnl_unlock(); 1124 1125 /* this has nothing to do now but make sure it's gone */ 1126 cancel_work_sync(&rdev->wiphy_work); 1127 1128 cancel_work_sync(&rdev->conn_work); 1129 flush_work(&rdev->event_work); 1130 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 1131 cancel_delayed_work_sync(&rdev->background_cac_done_wk); 1132 flush_work(&rdev->destroy_work); 1133 flush_work(&rdev->propagate_radar_detect_wk); 1134 flush_work(&rdev->propagate_cac_done_wk); 1135 flush_work(&rdev->mgmt_registrations_update_wk); 1136 flush_work(&rdev->background_cac_abort_wk); 1137 1138 cfg80211_rdev_free_wowlan(rdev); 1139 cfg80211_rdev_free_coalesce(rdev); 1140 } 1141 EXPORT_SYMBOL(wiphy_unregister); 1142 1143 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 1144 { 1145 struct cfg80211_internal_bss *scan, *tmp; 1146 struct cfg80211_beacon_registration *reg, *treg; 1147 rfkill_destroy(rdev->wiphy.rfkill); 1148 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 1149 list_del(®->list); 1150 kfree(reg); 1151 } 1152 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 1153 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 1154 mutex_destroy(&rdev->wiphy.mtx); 1155 1156 /* 1157 * The 'regd' can only be non-NULL if we never finished 1158 * initializing the wiphy and thus never went through the 1159 * unregister path - e.g. in failure scenarios. Thus, it 1160 * cannot have been visible to anyone if non-NULL, so we 1161 * can just free it here. 1162 */ 1163 kfree(rcu_dereference_raw(rdev->wiphy.regd)); 1164 1165 kfree(rdev); 1166 } 1167 1168 void wiphy_free(struct wiphy *wiphy) 1169 { 1170 put_device(&wiphy->dev); 1171 } 1172 EXPORT_SYMBOL(wiphy_free); 1173 1174 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked, 1175 enum rfkill_hard_block_reasons reason) 1176 { 1177 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1178 1179 if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason)) 1180 schedule_work(&rdev->rfkill_block); 1181 } 1182 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason); 1183 1184 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev, 1185 bool unregister_netdev) 1186 { 1187 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1188 struct cfg80211_cqm_config *cqm_config; 1189 unsigned int link_id; 1190 1191 ASSERT_RTNL(); 1192 lockdep_assert_held(&rdev->wiphy.mtx); 1193 1194 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 1195 1196 wdev->registered = false; 1197 1198 if (wdev->netdev) { 1199 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211"); 1200 if (unregister_netdev) 1201 unregister_netdevice(wdev->netdev); 1202 } 1203 1204 list_del_rcu(&wdev->list); 1205 synchronize_net(); 1206 rdev->devlist_generation++; 1207 1208 cfg80211_mlme_purge_registrations(wdev); 1209 1210 switch (wdev->iftype) { 1211 case NL80211_IFTYPE_P2P_DEVICE: 1212 cfg80211_stop_p2p_device(rdev, wdev); 1213 break; 1214 case NL80211_IFTYPE_NAN: 1215 cfg80211_stop_nan(rdev, wdev); 1216 break; 1217 default: 1218 break; 1219 } 1220 1221 #ifdef CONFIG_CFG80211_WEXT 1222 kfree_sensitive(wdev->wext.keys); 1223 wdev->wext.keys = NULL; 1224 #endif 1225 wiphy_work_cancel(wdev->wiphy, &wdev->cqm_rssi_work); 1226 /* deleted from the list, so can't be found from nl80211 any more */ 1227 cqm_config = rcu_access_pointer(wdev->cqm_config); 1228 kfree_rcu(cqm_config, rcu_head); 1229 1230 /* 1231 * Ensure that all events have been processed and 1232 * freed. 1233 */ 1234 cfg80211_process_wdev_events(wdev); 1235 1236 if (wdev->iftype == NL80211_IFTYPE_STATION || 1237 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) { 1238 for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) { 1239 struct cfg80211_internal_bss *curbss; 1240 1241 curbss = wdev->links[link_id].client.current_bss; 1242 1243 if (WARN_ON(curbss)) { 1244 cfg80211_unhold_bss(curbss); 1245 cfg80211_put_bss(wdev->wiphy, &curbss->pub); 1246 wdev->links[link_id].client.current_bss = NULL; 1247 } 1248 } 1249 } 1250 1251 wdev->connected = false; 1252 } 1253 1254 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 1255 { 1256 _cfg80211_unregister_wdev(wdev, true); 1257 } 1258 EXPORT_SYMBOL(cfg80211_unregister_wdev); 1259 1260 static const struct device_type wiphy_type = { 1261 .name = "wlan", 1262 }; 1263 1264 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 1265 enum nl80211_iftype iftype, int num) 1266 { 1267 lockdep_assert_held(&rdev->wiphy.mtx); 1268 1269 rdev->num_running_ifaces += num; 1270 if (iftype == NL80211_IFTYPE_MONITOR) 1271 rdev->num_running_monitor_ifaces += num; 1272 } 1273 1274 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 1275 struct wireless_dev *wdev) 1276 { 1277 struct net_device *dev = wdev->netdev; 1278 struct cfg80211_sched_scan_request *pos, *tmp; 1279 1280 lockdep_assert_held(&rdev->wiphy.mtx); 1281 ASSERT_WDEV_LOCK(wdev); 1282 1283 cfg80211_pmsr_wdev_down(wdev); 1284 1285 cfg80211_stop_background_radar_detection(wdev); 1286 1287 switch (wdev->iftype) { 1288 case NL80211_IFTYPE_ADHOC: 1289 __cfg80211_leave_ibss(rdev, dev, true); 1290 break; 1291 case NL80211_IFTYPE_P2P_CLIENT: 1292 case NL80211_IFTYPE_STATION: 1293 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, 1294 list) { 1295 if (dev == pos->dev) 1296 cfg80211_stop_sched_scan_req(rdev, pos, false); 1297 } 1298 1299 #ifdef CONFIG_CFG80211_WEXT 1300 kfree(wdev->wext.ie); 1301 wdev->wext.ie = NULL; 1302 wdev->wext.ie_len = 0; 1303 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1304 #endif 1305 cfg80211_disconnect(rdev, dev, 1306 WLAN_REASON_DEAUTH_LEAVING, true); 1307 break; 1308 case NL80211_IFTYPE_MESH_POINT: 1309 __cfg80211_leave_mesh(rdev, dev); 1310 break; 1311 case NL80211_IFTYPE_AP: 1312 case NL80211_IFTYPE_P2P_GO: 1313 __cfg80211_stop_ap(rdev, dev, -1, true); 1314 break; 1315 case NL80211_IFTYPE_OCB: 1316 __cfg80211_leave_ocb(rdev, dev); 1317 break; 1318 case NL80211_IFTYPE_P2P_DEVICE: 1319 case NL80211_IFTYPE_NAN: 1320 /* cannot happen, has no netdev */ 1321 break; 1322 case NL80211_IFTYPE_AP_VLAN: 1323 case NL80211_IFTYPE_MONITOR: 1324 /* nothing to do */ 1325 break; 1326 case NL80211_IFTYPE_UNSPECIFIED: 1327 case NL80211_IFTYPE_WDS: 1328 case NUM_NL80211_IFTYPES: 1329 /* invalid */ 1330 break; 1331 } 1332 } 1333 1334 void cfg80211_leave(struct cfg80211_registered_device *rdev, 1335 struct wireless_dev *wdev) 1336 { 1337 wdev_lock(wdev); 1338 __cfg80211_leave(rdev, wdev); 1339 wdev_unlock(wdev); 1340 } 1341 1342 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 1343 gfp_t gfp) 1344 { 1345 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1346 struct cfg80211_event *ev; 1347 unsigned long flags; 1348 1349 trace_cfg80211_stop_iface(wiphy, wdev); 1350 1351 ev = kzalloc(sizeof(*ev), gfp); 1352 if (!ev) 1353 return; 1354 1355 ev->type = EVENT_STOPPED; 1356 1357 spin_lock_irqsave(&wdev->event_lock, flags); 1358 list_add_tail(&ev->list, &wdev->event_list); 1359 spin_unlock_irqrestore(&wdev->event_lock, flags); 1360 queue_work(cfg80211_wq, &rdev->event_work); 1361 } 1362 EXPORT_SYMBOL(cfg80211_stop_iface); 1363 1364 void cfg80211_init_wdev(struct wireless_dev *wdev) 1365 { 1366 mutex_init(&wdev->mtx); 1367 INIT_LIST_HEAD(&wdev->event_list); 1368 spin_lock_init(&wdev->event_lock); 1369 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1370 INIT_LIST_HEAD(&wdev->pmsr_list); 1371 spin_lock_init(&wdev->pmsr_lock); 1372 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk); 1373 1374 #ifdef CONFIG_CFG80211_WEXT 1375 wdev->wext.default_key = -1; 1376 wdev->wext.default_mgmt_key = -1; 1377 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1378 #endif 1379 1380 wiphy_work_init(&wdev->cqm_rssi_work, cfg80211_cqm_rssi_notify_work); 1381 1382 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1383 wdev->ps = true; 1384 else 1385 wdev->ps = false; 1386 /* allow mac80211 to determine the timeout */ 1387 wdev->ps_timeout = -1; 1388 1389 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1390 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1391 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1392 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE; 1393 1394 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk); 1395 } 1396 1397 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev, 1398 struct wireless_dev *wdev) 1399 { 1400 ASSERT_RTNL(); 1401 lockdep_assert_held(&rdev->wiphy.mtx); 1402 1403 /* 1404 * We get here also when the interface changes network namespaces, 1405 * as it's registered into the new one, but we don't want it to 1406 * change ID in that case. Checking if the ID is already assigned 1407 * works, because 0 isn't considered a valid ID and the memory is 1408 * 0-initialized. 1409 */ 1410 if (!wdev->identifier) 1411 wdev->identifier = ++rdev->wdev_id; 1412 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list); 1413 rdev->devlist_generation++; 1414 wdev->registered = true; 1415 1416 if (wdev->netdev && 1417 sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj, 1418 "phy80211")) 1419 pr_err("failed to add phy80211 symlink to netdev!\n"); 1420 1421 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 1422 } 1423 1424 int cfg80211_register_netdevice(struct net_device *dev) 1425 { 1426 struct wireless_dev *wdev = dev->ieee80211_ptr; 1427 struct cfg80211_registered_device *rdev; 1428 int ret; 1429 1430 ASSERT_RTNL(); 1431 1432 if (WARN_ON(!wdev)) 1433 return -EINVAL; 1434 1435 rdev = wiphy_to_rdev(wdev->wiphy); 1436 1437 lockdep_assert_held(&rdev->wiphy.mtx); 1438 1439 /* we'll take care of this */ 1440 wdev->registered = true; 1441 wdev->registering = true; 1442 ret = register_netdevice(dev); 1443 if (ret) 1444 goto out; 1445 1446 cfg80211_register_wdev(rdev, wdev); 1447 ret = 0; 1448 out: 1449 wdev->registering = false; 1450 if (ret) 1451 wdev->registered = false; 1452 return ret; 1453 } 1454 EXPORT_SYMBOL(cfg80211_register_netdevice); 1455 1456 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 1457 unsigned long state, void *ptr) 1458 { 1459 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1460 struct wireless_dev *wdev = dev->ieee80211_ptr; 1461 struct cfg80211_registered_device *rdev; 1462 struct cfg80211_sched_scan_request *pos, *tmp; 1463 1464 if (!wdev) 1465 return NOTIFY_DONE; 1466 1467 rdev = wiphy_to_rdev(wdev->wiphy); 1468 1469 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 1470 1471 switch (state) { 1472 case NETDEV_POST_INIT: 1473 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 1474 wdev->netdev = dev; 1475 /* can only change netns with wiphy */ 1476 dev->features |= NETIF_F_NETNS_LOCAL; 1477 1478 cfg80211_init_wdev(wdev); 1479 break; 1480 case NETDEV_REGISTER: 1481 if (!wdev->registered) { 1482 wiphy_lock(&rdev->wiphy); 1483 cfg80211_register_wdev(rdev, wdev); 1484 wiphy_unlock(&rdev->wiphy); 1485 } 1486 break; 1487 case NETDEV_UNREGISTER: 1488 /* 1489 * It is possible to get NETDEV_UNREGISTER multiple times, 1490 * so check wdev->registered. 1491 */ 1492 if (wdev->registered && !wdev->registering) { 1493 wiphy_lock(&rdev->wiphy); 1494 _cfg80211_unregister_wdev(wdev, false); 1495 wiphy_unlock(&rdev->wiphy); 1496 } 1497 break; 1498 case NETDEV_GOING_DOWN: 1499 wiphy_lock(&rdev->wiphy); 1500 cfg80211_leave(rdev, wdev); 1501 cfg80211_remove_links(wdev); 1502 wiphy_unlock(&rdev->wiphy); 1503 /* since we just did cfg80211_leave() nothing to do there */ 1504 cancel_work_sync(&wdev->disconnect_wk); 1505 cancel_work_sync(&wdev->pmsr_free_wk); 1506 break; 1507 case NETDEV_DOWN: 1508 wiphy_lock(&rdev->wiphy); 1509 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1510 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1511 if (WARN_ON(!rdev->scan_req->notified && 1512 (!rdev->int_scan_req || 1513 !rdev->int_scan_req->notified))) 1514 rdev->scan_req->info.aborted = true; 1515 ___cfg80211_scan_done(rdev, false); 1516 } 1517 1518 list_for_each_entry_safe(pos, tmp, 1519 &rdev->sched_scan_req_list, list) { 1520 if (WARN_ON(pos->dev == wdev->netdev)) 1521 cfg80211_stop_sched_scan_req(rdev, pos, false); 1522 } 1523 1524 rdev->opencount--; 1525 wiphy_unlock(&rdev->wiphy); 1526 wake_up(&rdev->dev_wait); 1527 break; 1528 case NETDEV_UP: 1529 wiphy_lock(&rdev->wiphy); 1530 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1531 wdev_lock(wdev); 1532 switch (wdev->iftype) { 1533 #ifdef CONFIG_CFG80211_WEXT 1534 case NL80211_IFTYPE_ADHOC: 1535 cfg80211_ibss_wext_join(rdev, wdev); 1536 break; 1537 case NL80211_IFTYPE_STATION: 1538 cfg80211_mgd_wext_connect(rdev, wdev); 1539 break; 1540 #endif 1541 #ifdef CONFIG_MAC80211_MESH 1542 case NL80211_IFTYPE_MESH_POINT: 1543 { 1544 /* backward compat code... */ 1545 struct mesh_setup setup; 1546 memcpy(&setup, &default_mesh_setup, 1547 sizeof(setup)); 1548 /* back compat only needed for mesh_id */ 1549 setup.mesh_id = wdev->u.mesh.id; 1550 setup.mesh_id_len = wdev->u.mesh.id_up_len; 1551 if (wdev->u.mesh.id_up_len) 1552 __cfg80211_join_mesh(rdev, dev, 1553 &setup, 1554 &default_mesh_config); 1555 break; 1556 } 1557 #endif 1558 default: 1559 break; 1560 } 1561 wdev_unlock(wdev); 1562 rdev->opencount++; 1563 1564 /* 1565 * Configure power management to the driver here so that its 1566 * correctly set also after interface type changes etc. 1567 */ 1568 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1569 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1570 rdev->ops->set_power_mgmt && 1571 rdev_set_power_mgmt(rdev, dev, wdev->ps, 1572 wdev->ps_timeout)) { 1573 /* assume this means it's off */ 1574 wdev->ps = false; 1575 } 1576 wiphy_unlock(&rdev->wiphy); 1577 break; 1578 case NETDEV_PRE_UP: 1579 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype, 1580 wdev->use_4addr, 0)) 1581 return notifier_from_errno(-EOPNOTSUPP); 1582 1583 if (rfkill_blocked(rdev->wiphy.rfkill)) 1584 return notifier_from_errno(-ERFKILL); 1585 break; 1586 default: 1587 return NOTIFY_DONE; 1588 } 1589 1590 wireless_nlevent_flush(); 1591 1592 return NOTIFY_OK; 1593 } 1594 1595 static struct notifier_block cfg80211_netdev_notifier = { 1596 .notifier_call = cfg80211_netdev_notifier_call, 1597 }; 1598 1599 static void __net_exit cfg80211_pernet_exit(struct net *net) 1600 { 1601 struct cfg80211_registered_device *rdev; 1602 1603 rtnl_lock(); 1604 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1605 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1606 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1607 } 1608 rtnl_unlock(); 1609 } 1610 1611 static struct pernet_operations cfg80211_pernet_ops = { 1612 .exit = cfg80211_pernet_exit, 1613 }; 1614 1615 void wiphy_work_queue(struct wiphy *wiphy, struct wiphy_work *work) 1616 { 1617 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1618 unsigned long flags; 1619 1620 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1621 if (list_empty(&work->entry)) 1622 list_add_tail(&work->entry, &rdev->wiphy_work_list); 1623 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1624 1625 queue_work(system_unbound_wq, &rdev->wiphy_work); 1626 } 1627 EXPORT_SYMBOL_GPL(wiphy_work_queue); 1628 1629 void wiphy_work_cancel(struct wiphy *wiphy, struct wiphy_work *work) 1630 { 1631 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1632 unsigned long flags; 1633 1634 lockdep_assert_held(&wiphy->mtx); 1635 1636 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1637 if (!list_empty(&work->entry)) 1638 list_del_init(&work->entry); 1639 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1640 } 1641 EXPORT_SYMBOL_GPL(wiphy_work_cancel); 1642 1643 void wiphy_delayed_work_timer(struct timer_list *t) 1644 { 1645 struct wiphy_delayed_work *dwork = from_timer(dwork, t, timer); 1646 1647 wiphy_work_queue(dwork->wiphy, &dwork->work); 1648 } 1649 EXPORT_SYMBOL(wiphy_delayed_work_timer); 1650 1651 void wiphy_delayed_work_queue(struct wiphy *wiphy, 1652 struct wiphy_delayed_work *dwork, 1653 unsigned long delay) 1654 { 1655 if (!delay) { 1656 wiphy_work_queue(wiphy, &dwork->work); 1657 return; 1658 } 1659 1660 dwork->wiphy = wiphy; 1661 mod_timer(&dwork->timer, jiffies + delay); 1662 } 1663 EXPORT_SYMBOL_GPL(wiphy_delayed_work_queue); 1664 1665 void wiphy_delayed_work_cancel(struct wiphy *wiphy, 1666 struct wiphy_delayed_work *dwork) 1667 { 1668 lockdep_assert_held(&wiphy->mtx); 1669 1670 del_timer_sync(&dwork->timer); 1671 wiphy_work_cancel(wiphy, &dwork->work); 1672 } 1673 EXPORT_SYMBOL_GPL(wiphy_delayed_work_cancel); 1674 1675 static int __init cfg80211_init(void) 1676 { 1677 int err; 1678 1679 err = register_pernet_device(&cfg80211_pernet_ops); 1680 if (err) 1681 goto out_fail_pernet; 1682 1683 err = wiphy_sysfs_init(); 1684 if (err) 1685 goto out_fail_sysfs; 1686 1687 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1688 if (err) 1689 goto out_fail_notifier; 1690 1691 err = nl80211_init(); 1692 if (err) 1693 goto out_fail_nl80211; 1694 1695 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1696 1697 err = regulatory_init(); 1698 if (err) 1699 goto out_fail_reg; 1700 1701 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM); 1702 if (!cfg80211_wq) { 1703 err = -ENOMEM; 1704 goto out_fail_wq; 1705 } 1706 1707 return 0; 1708 1709 out_fail_wq: 1710 regulatory_exit(); 1711 out_fail_reg: 1712 debugfs_remove(ieee80211_debugfs_dir); 1713 nl80211_exit(); 1714 out_fail_nl80211: 1715 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1716 out_fail_notifier: 1717 wiphy_sysfs_exit(); 1718 out_fail_sysfs: 1719 unregister_pernet_device(&cfg80211_pernet_ops); 1720 out_fail_pernet: 1721 return err; 1722 } 1723 fs_initcall(cfg80211_init); 1724 1725 static void __exit cfg80211_exit(void) 1726 { 1727 debugfs_remove(ieee80211_debugfs_dir); 1728 nl80211_exit(); 1729 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1730 wiphy_sysfs_exit(); 1731 regulatory_exit(); 1732 unregister_pernet_device(&cfg80211_pernet_ops); 1733 destroy_workqueue(cfg80211_wq); 1734 } 1735 module_exit(cfg80211_exit); 1736