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) 2018-2020 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(); 132 133 /* Ignore nop renames */ 134 if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0) 135 return 0; 136 137 result = cfg80211_dev_check_name(rdev, newname); 138 if (result < 0) 139 return result; 140 141 result = device_rename(&rdev->wiphy.dev, newname); 142 if (result) 143 return result; 144 145 if (!IS_ERR_OR_NULL(rdev->wiphy.debugfsdir)) 146 debugfs_rename(rdev->wiphy.debugfsdir->d_parent, 147 rdev->wiphy.debugfsdir, 148 rdev->wiphy.debugfsdir->d_parent, newname); 149 150 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 151 152 return 0; 153 } 154 155 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, 156 struct net *net) 157 { 158 struct wireless_dev *wdev; 159 int err = 0; 160 161 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK)) 162 return -EOPNOTSUPP; 163 164 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 165 if (!wdev->netdev) 166 continue; 167 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 168 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); 169 if (err) 170 break; 171 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 172 } 173 174 if (err) { 175 /* failed -- clean up to old netns */ 176 net = wiphy_net(&rdev->wiphy); 177 178 list_for_each_entry_continue_reverse(wdev, 179 &rdev->wiphy.wdev_list, 180 list) { 181 if (!wdev->netdev) 182 continue; 183 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 184 err = dev_change_net_namespace(wdev->netdev, net, 185 "wlan%d"); 186 WARN_ON(err); 187 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 188 } 189 190 return err; 191 } 192 193 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 194 if (!wdev->netdev) 195 continue; 196 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 197 } 198 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 199 200 wiphy_net_set(&rdev->wiphy, net); 201 202 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev)); 203 WARN_ON(err); 204 205 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 206 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 207 if (!wdev->netdev) 208 continue; 209 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 210 } 211 212 return 0; 213 } 214 215 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data) 216 { 217 struct cfg80211_registered_device *rdev = data; 218 219 rdev_rfkill_poll(rdev); 220 } 221 222 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev, 223 struct wireless_dev *wdev) 224 { 225 lockdep_assert_held(&rdev->wiphy.mtx); 226 227 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE)) 228 return; 229 230 if (!wdev_running(wdev)) 231 return; 232 233 rdev_stop_p2p_device(rdev, wdev); 234 wdev->is_running = false; 235 236 rdev->opencount--; 237 238 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 239 if (WARN_ON(!rdev->scan_req->notified && 240 (!rdev->int_scan_req || 241 !rdev->int_scan_req->notified))) 242 rdev->scan_req->info.aborted = true; 243 ___cfg80211_scan_done(rdev, false); 244 } 245 } 246 247 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev, 248 struct wireless_dev *wdev) 249 { 250 lockdep_assert_held(&rdev->wiphy.mtx); 251 252 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN)) 253 return; 254 255 if (!wdev_running(wdev)) 256 return; 257 258 rdev_stop_nan(rdev, wdev); 259 wdev->is_running = false; 260 261 rdev->opencount--; 262 } 263 264 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy) 265 { 266 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 267 struct wireless_dev *wdev; 268 269 ASSERT_RTNL(); 270 271 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 272 if (wdev->netdev) { 273 dev_close(wdev->netdev); 274 continue; 275 } 276 277 /* otherwise, check iftype */ 278 279 wiphy_lock(wiphy); 280 281 switch (wdev->iftype) { 282 case NL80211_IFTYPE_P2P_DEVICE: 283 cfg80211_stop_p2p_device(rdev, wdev); 284 break; 285 case NL80211_IFTYPE_NAN: 286 cfg80211_stop_nan(rdev, wdev); 287 break; 288 default: 289 break; 290 } 291 292 wiphy_unlock(wiphy); 293 } 294 } 295 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces); 296 297 static int cfg80211_rfkill_set_block(void *data, bool blocked) 298 { 299 struct cfg80211_registered_device *rdev = data; 300 301 if (!blocked) 302 return 0; 303 304 rtnl_lock(); 305 cfg80211_shutdown_all_interfaces(&rdev->wiphy); 306 rtnl_unlock(); 307 308 return 0; 309 } 310 311 static void cfg80211_rfkill_block_work(struct work_struct *work) 312 { 313 struct cfg80211_registered_device *rdev; 314 315 rdev = container_of(work, struct cfg80211_registered_device, 316 rfkill_block); 317 cfg80211_rfkill_set_block(rdev, true); 318 } 319 320 static void cfg80211_event_work(struct work_struct *work) 321 { 322 struct cfg80211_registered_device *rdev; 323 324 rdev = container_of(work, struct cfg80211_registered_device, 325 event_work); 326 327 wiphy_lock(&rdev->wiphy); 328 cfg80211_process_rdev_events(rdev); 329 wiphy_unlock(&rdev->wiphy); 330 } 331 332 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev) 333 { 334 struct wireless_dev *wdev, *tmp; 335 bool found = false; 336 337 ASSERT_RTNL(); 338 339 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 340 if (wdev->nl_owner_dead) { 341 if (wdev->netdev) 342 dev_close(wdev->netdev); 343 found = true; 344 } 345 } 346 347 if (!found) 348 return; 349 350 wiphy_lock(&rdev->wiphy); 351 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) { 352 if (wdev->nl_owner_dead) { 353 cfg80211_leave(rdev, wdev); 354 rdev_del_virtual_intf(rdev, wdev); 355 } 356 } 357 wiphy_unlock(&rdev->wiphy); 358 } 359 360 static void cfg80211_destroy_iface_wk(struct work_struct *work) 361 { 362 struct cfg80211_registered_device *rdev; 363 364 rdev = container_of(work, struct cfg80211_registered_device, 365 destroy_work); 366 367 rtnl_lock(); 368 cfg80211_destroy_ifaces(rdev); 369 rtnl_unlock(); 370 } 371 372 static void cfg80211_sched_scan_stop_wk(struct work_struct *work) 373 { 374 struct cfg80211_registered_device *rdev; 375 struct cfg80211_sched_scan_request *req, *tmp; 376 377 rdev = container_of(work, struct cfg80211_registered_device, 378 sched_scan_stop_wk); 379 380 rtnl_lock(); 381 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { 382 if (req->nl_owner_dead) 383 cfg80211_stop_sched_scan_req(rdev, req, false); 384 } 385 rtnl_unlock(); 386 } 387 388 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work) 389 { 390 struct cfg80211_registered_device *rdev; 391 392 rdev = container_of(work, struct cfg80211_registered_device, 393 propagate_radar_detect_wk); 394 395 rtnl_lock(); 396 397 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef, 398 NL80211_DFS_UNAVAILABLE, 399 NL80211_RADAR_DETECTED); 400 401 rtnl_unlock(); 402 } 403 404 static void cfg80211_propagate_cac_done_wk(struct work_struct *work) 405 { 406 struct cfg80211_registered_device *rdev; 407 408 rdev = container_of(work, struct cfg80211_registered_device, 409 propagate_cac_done_wk); 410 411 rtnl_lock(); 412 413 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef, 414 NL80211_DFS_AVAILABLE, 415 NL80211_RADAR_CAC_FINISHED); 416 417 rtnl_unlock(); 418 } 419 420 /* exported functions */ 421 422 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, 423 const char *requested_name) 424 { 425 static atomic_t wiphy_counter = ATOMIC_INIT(0); 426 427 struct cfg80211_registered_device *rdev; 428 int alloc_size; 429 430 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 431 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 432 WARN_ON(ops->connect && !ops->disconnect); 433 WARN_ON(ops->join_ibss && !ops->leave_ibss); 434 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 435 WARN_ON(ops->add_station && !ops->del_station); 436 WARN_ON(ops->add_mpath && !ops->del_mpath); 437 WARN_ON(ops->join_mesh && !ops->leave_mesh); 438 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device); 439 WARN_ON(ops->start_ap && !ops->stop_ap); 440 WARN_ON(ops->join_ocb && !ops->leave_ocb); 441 WARN_ON(ops->suspend && !ops->resume); 442 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop); 443 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel); 444 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch); 445 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts); 446 447 alloc_size = sizeof(*rdev) + sizeof_priv; 448 449 rdev = kzalloc(alloc_size, GFP_KERNEL); 450 if (!rdev) 451 return NULL; 452 453 rdev->ops = ops; 454 455 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 456 457 if (unlikely(rdev->wiphy_idx < 0)) { 458 /* ugh, wrapped! */ 459 atomic_dec(&wiphy_counter); 460 kfree(rdev); 461 return NULL; 462 } 463 464 /* atomic_inc_return makes it start at 1, make it start at 0 */ 465 rdev->wiphy_idx--; 466 467 /* give it a proper name */ 468 if (requested_name && requested_name[0]) { 469 int rv; 470 471 rtnl_lock(); 472 rv = cfg80211_dev_check_name(rdev, requested_name); 473 474 if (rv < 0) { 475 rtnl_unlock(); 476 goto use_default_name; 477 } 478 479 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); 480 rtnl_unlock(); 481 if (rv) 482 goto use_default_name; 483 } else { 484 int rv; 485 486 use_default_name: 487 /* NOTE: This is *probably* safe w/out holding rtnl because of 488 * the restrictions on phy names. Probably this call could 489 * fail if some other part of the kernel (re)named a device 490 * phyX. But, might should add some locking and check return 491 * value, and use a different name if this one exists? 492 */ 493 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 494 if (rv < 0) { 495 kfree(rdev); 496 return NULL; 497 } 498 } 499 500 mutex_init(&rdev->wiphy.mtx); 501 INIT_LIST_HEAD(&rdev->wiphy.wdev_list); 502 INIT_LIST_HEAD(&rdev->beacon_registrations); 503 spin_lock_init(&rdev->beacon_registrations_lock); 504 spin_lock_init(&rdev->bss_lock); 505 INIT_LIST_HEAD(&rdev->bss_list); 506 INIT_LIST_HEAD(&rdev->sched_scan_req_list); 507 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 508 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 509 cfg80211_dfs_channels_update_work); 510 #ifdef CONFIG_CFG80211_WEXT 511 rdev->wiphy.wext = &cfg80211_wext_handler; 512 #endif 513 514 device_initialize(&rdev->wiphy.dev); 515 rdev->wiphy.dev.class = &ieee80211_class; 516 rdev->wiphy.dev.platform_data = rdev; 517 device_enable_async_suspend(&rdev->wiphy.dev); 518 519 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 520 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 521 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk); 522 INIT_WORK(&rdev->propagate_radar_detect_wk, 523 cfg80211_propagate_radar_detect_wk); 524 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk); 525 INIT_WORK(&rdev->mgmt_registrations_update_wk, 526 cfg80211_mgmt_registrations_update_wk); 527 528 #ifdef CONFIG_CFG80211_DEFAULT_PS 529 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 530 #endif 531 532 wiphy_net_set(&rdev->wiphy, &init_net); 533 534 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 535 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 536 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 537 &rdev->rfkill_ops, rdev); 538 539 if (!rdev->rfkill) { 540 wiphy_free(&rdev->wiphy); 541 return NULL; 542 } 543 544 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work); 545 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 546 INIT_WORK(&rdev->event_work, cfg80211_event_work); 547 548 init_waitqueue_head(&rdev->dev_wait); 549 550 /* 551 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 552 * Fragmentation and RTS threshold are disabled by default with the 553 * special -1 value. 554 */ 555 rdev->wiphy.retry_short = 7; 556 rdev->wiphy.retry_long = 4; 557 rdev->wiphy.frag_threshold = (u32) -1; 558 rdev->wiphy.rts_threshold = (u32) -1; 559 rdev->wiphy.coverage_class = 0; 560 561 rdev->wiphy.max_num_csa_counters = 1; 562 563 rdev->wiphy.max_sched_scan_plans = 1; 564 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 565 566 return &rdev->wiphy; 567 } 568 EXPORT_SYMBOL(wiphy_new_nm); 569 570 static int wiphy_verify_combinations(struct wiphy *wiphy) 571 { 572 const struct ieee80211_iface_combination *c; 573 int i, j; 574 575 for (i = 0; i < wiphy->n_iface_combinations; i++) { 576 u32 cnt = 0; 577 u16 all_iftypes = 0; 578 579 c = &wiphy->iface_combinations[i]; 580 581 /* 582 * Combinations with just one interface aren't real, 583 * however we make an exception for DFS. 584 */ 585 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 586 return -EINVAL; 587 588 /* Need at least one channel */ 589 if (WARN_ON(!c->num_different_channels)) 590 return -EINVAL; 591 592 /* 593 * Put a sane limit on maximum number of different 594 * channels to simplify channel accounting code. 595 */ 596 if (WARN_ON(c->num_different_channels > 597 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 598 return -EINVAL; 599 600 /* DFS only works on one channel. */ 601 if (WARN_ON(c->radar_detect_widths && 602 (c->num_different_channels > 1))) 603 return -EINVAL; 604 605 if (WARN_ON(!c->n_limits)) 606 return -EINVAL; 607 608 for (j = 0; j < c->n_limits; j++) { 609 u16 types = c->limits[j].types; 610 611 /* interface types shouldn't overlap */ 612 if (WARN_ON(types & all_iftypes)) 613 return -EINVAL; 614 all_iftypes |= types; 615 616 if (WARN_ON(!c->limits[j].max)) 617 return -EINVAL; 618 619 /* Shouldn't list software iftypes in combinations! */ 620 if (WARN_ON(wiphy->software_iftypes & types)) 621 return -EINVAL; 622 623 /* Only a single P2P_DEVICE can be allowed */ 624 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 625 c->limits[j].max > 1)) 626 return -EINVAL; 627 628 /* Only a single NAN can be allowed */ 629 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) && 630 c->limits[j].max > 1)) 631 return -EINVAL; 632 633 /* 634 * This isn't well-defined right now. If you have an 635 * IBSS interface, then its beacon interval may change 636 * by joining other networks, and nothing prevents it 637 * from doing that. 638 * So technically we probably shouldn't even allow AP 639 * and IBSS in the same interface, but it seems that 640 * some drivers support that, possibly only with fixed 641 * beacon intervals for IBSS. 642 */ 643 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) && 644 c->beacon_int_min_gcd)) { 645 return -EINVAL; 646 } 647 648 cnt += c->limits[j].max; 649 /* 650 * Don't advertise an unsupported type 651 * in a combination. 652 */ 653 if (WARN_ON((wiphy->interface_modes & types) != types)) 654 return -EINVAL; 655 } 656 657 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS))) 658 return -EINVAL; 659 660 /* You can't even choose that many! */ 661 if (WARN_ON(cnt < c->max_interfaces)) 662 return -EINVAL; 663 } 664 665 return 0; 666 } 667 668 int wiphy_register(struct wiphy *wiphy) 669 { 670 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 671 int res; 672 enum nl80211_band band; 673 struct ieee80211_supported_band *sband; 674 bool have_band = false; 675 int i; 676 u16 ifmodes = wiphy->interface_modes; 677 678 #ifdef CONFIG_PM 679 if (WARN_ON(wiphy->wowlan && 680 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 681 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 682 return -EINVAL; 683 if (WARN_ON(wiphy->wowlan && 684 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 685 !wiphy->wowlan->tcp)) 686 return -EINVAL; 687 #endif 688 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 689 (!rdev->ops->tdls_channel_switch || 690 !rdev->ops->tdls_cancel_channel_switch))) 691 return -EINVAL; 692 693 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) && 694 (!rdev->ops->start_nan || !rdev->ops->stop_nan || 695 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func || 696 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ))))) 697 return -EINVAL; 698 699 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))) 700 return -EINVAL; 701 702 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported)) 703 return -EINVAL; 704 705 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) { 706 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap && 707 !wiphy->pmsr_capa->ftm.non_asap)) 708 return -EINVAL; 709 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles || 710 !wiphy->pmsr_capa->ftm.bandwidths)) 711 return -EINVAL; 712 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles & 713 ~(BIT(NL80211_PREAMBLE_LEGACY) | 714 BIT(NL80211_PREAMBLE_HT) | 715 BIT(NL80211_PREAMBLE_VHT) | 716 BIT(NL80211_PREAMBLE_HE) | 717 BIT(NL80211_PREAMBLE_DMG)))) 718 return -EINVAL; 719 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based || 720 wiphy->pmsr_capa->ftm.non_trigger_based) && 721 !(wiphy->pmsr_capa->ftm.preambles & 722 BIT(NL80211_PREAMBLE_HE)))) 723 return -EINVAL; 724 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths & 725 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) | 726 BIT(NL80211_CHAN_WIDTH_20) | 727 BIT(NL80211_CHAN_WIDTH_40) | 728 BIT(NL80211_CHAN_WIDTH_80) | 729 BIT(NL80211_CHAN_WIDTH_80P80) | 730 BIT(NL80211_CHAN_WIDTH_160) | 731 BIT(NL80211_CHAN_WIDTH_5) | 732 BIT(NL80211_CHAN_WIDTH_10)))) 733 return -EINVAL; 734 } 735 736 /* 737 * if a wiphy has unsupported modes for regulatory channel enforcement, 738 * opt-out of enforcement checking 739 */ 740 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) | 741 BIT(NL80211_IFTYPE_P2P_CLIENT) | 742 BIT(NL80211_IFTYPE_AP) | 743 BIT(NL80211_IFTYPE_P2P_GO) | 744 BIT(NL80211_IFTYPE_ADHOC) | 745 BIT(NL80211_IFTYPE_P2P_DEVICE) | 746 BIT(NL80211_IFTYPE_NAN) | 747 BIT(NL80211_IFTYPE_AP_VLAN) | 748 BIT(NL80211_IFTYPE_MONITOR))) 749 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF; 750 751 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 752 (wiphy->regulatory_flags & 753 (REGULATORY_CUSTOM_REG | 754 REGULATORY_STRICT_REG | 755 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 756 REGULATORY_COUNTRY_IE_IGNORE)))) 757 return -EINVAL; 758 759 if (WARN_ON(wiphy->coalesce && 760 (!wiphy->coalesce->n_rules || 761 !wiphy->coalesce->n_patterns) && 762 (!wiphy->coalesce->pattern_min_len || 763 wiphy->coalesce->pattern_min_len > 764 wiphy->coalesce->pattern_max_len))) 765 return -EINVAL; 766 767 if (WARN_ON(wiphy->ap_sme_capa && 768 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 769 return -EINVAL; 770 771 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 772 return -EINVAL; 773 774 if (WARN_ON(wiphy->addresses && 775 !is_zero_ether_addr(wiphy->perm_addr) && 776 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 777 ETH_ALEN))) 778 return -EINVAL; 779 780 if (WARN_ON(wiphy->max_acl_mac_addrs && 781 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 782 !rdev->ops->set_mac_acl))) 783 return -EINVAL; 784 785 /* assure only valid behaviours are flagged by driver 786 * hence subtract 2 as bit 0 is invalid. 787 */ 788 if (WARN_ON(wiphy->bss_select_support && 789 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 790 return -EINVAL; 791 792 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy, 793 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) && 794 (!rdev->ops->set_pmk || !rdev->ops->del_pmk))) 795 return -EINVAL; 796 797 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) && 798 rdev->ops->update_connect_params)) 799 return -EINVAL; 800 801 if (wiphy->addresses) 802 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 803 804 /* sanity check ifmodes */ 805 WARN_ON(!ifmodes); 806 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 807 if (WARN_ON(ifmodes != wiphy->interface_modes)) 808 wiphy->interface_modes = ifmodes; 809 810 res = wiphy_verify_combinations(wiphy); 811 if (res) 812 return res; 813 814 /* sanity check supported bands/channels */ 815 for (band = 0; band < NUM_NL80211_BANDS; band++) { 816 u16 types = 0; 817 bool have_he = false; 818 819 sband = wiphy->bands[band]; 820 if (!sband) 821 continue; 822 823 sband->band = band; 824 if (WARN_ON(!sband->n_channels)) 825 return -EINVAL; 826 /* 827 * on 60GHz or sub-1Ghz band, there are no legacy rates, so 828 * n_bitrates is 0 829 */ 830 if (WARN_ON((band != NL80211_BAND_60GHZ && 831 band != NL80211_BAND_S1GHZ) && 832 !sband->n_bitrates)) 833 return -EINVAL; 834 835 if (WARN_ON(band == NL80211_BAND_6GHZ && 836 (sband->ht_cap.ht_supported || 837 sband->vht_cap.vht_supported))) 838 return -EINVAL; 839 840 /* 841 * Since cfg80211_disable_40mhz_24ghz is global, we can 842 * modify the sband's ht data even if the driver uses a 843 * global structure for that. 844 */ 845 if (cfg80211_disable_40mhz_24ghz && 846 band == NL80211_BAND_2GHZ && 847 sband->ht_cap.ht_supported) { 848 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 849 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 850 } 851 852 /* 853 * Since we use a u32 for rate bitmaps in 854 * ieee80211_get_response_rate, we cannot 855 * have more than 32 legacy rates. 856 */ 857 if (WARN_ON(sband->n_bitrates > 32)) 858 return -EINVAL; 859 860 for (i = 0; i < sband->n_channels; i++) { 861 sband->channels[i].orig_flags = 862 sband->channels[i].flags; 863 sband->channels[i].orig_mag = INT_MAX; 864 sband->channels[i].orig_mpwr = 865 sband->channels[i].max_power; 866 sband->channels[i].band = band; 867 868 if (WARN_ON(sband->channels[i].freq_offset >= 1000)) 869 return -EINVAL; 870 } 871 872 for (i = 0; i < sband->n_iftype_data; i++) { 873 const struct ieee80211_sband_iftype_data *iftd; 874 875 iftd = &sband->iftype_data[i]; 876 877 if (WARN_ON(!iftd->types_mask)) 878 return -EINVAL; 879 if (WARN_ON(types & iftd->types_mask)) 880 return -EINVAL; 881 882 /* at least one piece of information must be present */ 883 if (WARN_ON(!iftd->he_cap.has_he)) 884 return -EINVAL; 885 886 types |= iftd->types_mask; 887 888 if (i == 0) 889 have_he = iftd->he_cap.has_he; 890 else 891 have_he = have_he && 892 iftd->he_cap.has_he; 893 } 894 895 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ)) 896 return -EINVAL; 897 898 have_band = true; 899 } 900 901 if (!have_band) { 902 WARN_ON(1); 903 return -EINVAL; 904 } 905 906 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) { 907 /* 908 * Validate we have a policy (can be explicitly set to 909 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that 910 * we have at least one of doit/dumpit. 911 */ 912 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy)) 913 return -EINVAL; 914 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit && 915 !rdev->wiphy.vendor_commands[i].dumpit)) 916 return -EINVAL; 917 } 918 919 #ifdef CONFIG_PM 920 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 921 (!rdev->wiphy.wowlan->pattern_min_len || 922 rdev->wiphy.wowlan->pattern_min_len > 923 rdev->wiphy.wowlan->pattern_max_len))) 924 return -EINVAL; 925 #endif 926 927 /* check and set up bitrates */ 928 ieee80211_set_bitrate_flags(wiphy); 929 930 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 931 932 rtnl_lock(); 933 res = device_add(&rdev->wiphy.dev); 934 if (res) { 935 rtnl_unlock(); 936 return res; 937 } 938 939 /* set up regulatory info */ 940 wiphy_regulatory_register(wiphy); 941 942 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 943 cfg80211_rdev_list_generation++; 944 945 /* add to debugfs */ 946 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy), 947 ieee80211_debugfs_dir); 948 949 cfg80211_debugfs_rdev_add(rdev); 950 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 951 952 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 953 struct regulatory_request request; 954 955 request.wiphy_idx = get_wiphy_idx(wiphy); 956 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 957 request.alpha2[0] = '9'; 958 request.alpha2[1] = '9'; 959 960 nl80211_send_reg_change_event(&request); 961 } 962 963 /* Check that nobody globally advertises any capabilities they do not 964 * advertise on all possible interface types. 965 */ 966 if (wiphy->extended_capabilities_len && 967 wiphy->num_iftype_ext_capab && 968 wiphy->iftype_ext_capab) { 969 u8 supported_on_all, j; 970 const struct wiphy_iftype_ext_capab *capab; 971 972 capab = wiphy->iftype_ext_capab; 973 for (j = 0; j < wiphy->extended_capabilities_len; j++) { 974 if (capab[0].extended_capabilities_len > j) 975 supported_on_all = 976 capab[0].extended_capabilities[j]; 977 else 978 supported_on_all = 0x00; 979 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) { 980 if (j >= capab[i].extended_capabilities_len) { 981 supported_on_all = 0x00; 982 break; 983 } 984 supported_on_all &= 985 capab[i].extended_capabilities[j]; 986 } 987 if (WARN_ON(wiphy->extended_capabilities[j] & 988 ~supported_on_all)) 989 break; 990 } 991 } 992 993 rdev->wiphy.registered = true; 994 rtnl_unlock(); 995 996 res = rfkill_register(rdev->rfkill); 997 if (res) { 998 rfkill_destroy(rdev->rfkill); 999 rdev->rfkill = NULL; 1000 wiphy_unregister(&rdev->wiphy); 1001 return res; 1002 } 1003 1004 return 0; 1005 } 1006 EXPORT_SYMBOL(wiphy_register); 1007 1008 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 1009 { 1010 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1011 1012 if (!rdev->ops->rfkill_poll) 1013 return; 1014 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 1015 rfkill_resume_polling(rdev->rfkill); 1016 } 1017 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 1018 1019 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 1020 { 1021 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1022 1023 rfkill_pause_polling(rdev->rfkill); 1024 } 1025 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 1026 1027 void wiphy_unregister(struct wiphy *wiphy) 1028 { 1029 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1030 1031 wait_event(rdev->dev_wait, ({ 1032 int __count; 1033 wiphy_lock(&rdev->wiphy); 1034 __count = rdev->opencount; 1035 wiphy_unlock(&rdev->wiphy); 1036 __count == 0; })); 1037 1038 if (rdev->rfkill) 1039 rfkill_unregister(rdev->rfkill); 1040 1041 rtnl_lock(); 1042 wiphy_lock(&rdev->wiphy); 1043 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 1044 rdev->wiphy.registered = false; 1045 1046 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 1047 1048 /* 1049 * First remove the hardware from everywhere, this makes 1050 * it impossible to find from userspace. 1051 */ 1052 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 1053 list_del_rcu(&rdev->list); 1054 synchronize_rcu(); 1055 1056 /* 1057 * If this device got a regulatory hint tell core its 1058 * free to listen now to a new shiny device regulatory hint 1059 */ 1060 wiphy_regulatory_deregister(wiphy); 1061 1062 cfg80211_rdev_list_generation++; 1063 device_del(&rdev->wiphy.dev); 1064 1065 wiphy_unlock(&rdev->wiphy); 1066 rtnl_unlock(); 1067 1068 flush_work(&rdev->scan_done_wk); 1069 cancel_work_sync(&rdev->conn_work); 1070 flush_work(&rdev->event_work); 1071 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 1072 flush_work(&rdev->destroy_work); 1073 flush_work(&rdev->sched_scan_stop_wk); 1074 flush_work(&rdev->propagate_radar_detect_wk); 1075 flush_work(&rdev->propagate_cac_done_wk); 1076 flush_work(&rdev->mgmt_registrations_update_wk); 1077 1078 #ifdef CONFIG_PM 1079 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 1080 rdev_set_wakeup(rdev, false); 1081 #endif 1082 cfg80211_rdev_free_wowlan(rdev); 1083 cfg80211_rdev_free_coalesce(rdev); 1084 } 1085 EXPORT_SYMBOL(wiphy_unregister); 1086 1087 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 1088 { 1089 struct cfg80211_internal_bss *scan, *tmp; 1090 struct cfg80211_beacon_registration *reg, *treg; 1091 rfkill_destroy(rdev->rfkill); 1092 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 1093 list_del(®->list); 1094 kfree(reg); 1095 } 1096 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 1097 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 1098 mutex_destroy(&rdev->wiphy.mtx); 1099 kfree(rdev); 1100 } 1101 1102 void wiphy_free(struct wiphy *wiphy) 1103 { 1104 put_device(&wiphy->dev); 1105 } 1106 EXPORT_SYMBOL(wiphy_free); 1107 1108 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked, 1109 enum rfkill_hard_block_reasons reason) 1110 { 1111 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1112 1113 if (rfkill_set_hw_state_reason(rdev->rfkill, blocked, reason)) 1114 schedule_work(&rdev->rfkill_block); 1115 } 1116 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason); 1117 1118 void cfg80211_cqm_config_free(struct wireless_dev *wdev) 1119 { 1120 kfree(wdev->cqm_config); 1121 wdev->cqm_config = NULL; 1122 } 1123 1124 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev, 1125 bool unregister_netdev) 1126 { 1127 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1128 1129 ASSERT_RTNL(); 1130 lockdep_assert_held(&rdev->wiphy.mtx); 1131 1132 flush_work(&wdev->pmsr_free_wk); 1133 1134 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 1135 1136 wdev->registered = false; 1137 1138 if (wdev->netdev) { 1139 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211"); 1140 if (unregister_netdev) 1141 unregister_netdevice(wdev->netdev); 1142 } 1143 1144 list_del_rcu(&wdev->list); 1145 synchronize_net(); 1146 rdev->devlist_generation++; 1147 1148 cfg80211_mlme_purge_registrations(wdev); 1149 1150 switch (wdev->iftype) { 1151 case NL80211_IFTYPE_P2P_DEVICE: 1152 cfg80211_stop_p2p_device(rdev, wdev); 1153 break; 1154 case NL80211_IFTYPE_NAN: 1155 cfg80211_stop_nan(rdev, wdev); 1156 break; 1157 default: 1158 break; 1159 } 1160 1161 #ifdef CONFIG_CFG80211_WEXT 1162 kfree_sensitive(wdev->wext.keys); 1163 wdev->wext.keys = NULL; 1164 #endif 1165 /* only initialized if we have a netdev */ 1166 if (wdev->netdev) 1167 flush_work(&wdev->disconnect_wk); 1168 1169 cfg80211_cqm_config_free(wdev); 1170 1171 /* 1172 * Ensure that all events have been processed and 1173 * freed. 1174 */ 1175 cfg80211_process_wdev_events(wdev); 1176 1177 if (WARN_ON(wdev->current_bss)) { 1178 cfg80211_unhold_bss(wdev->current_bss); 1179 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 1180 wdev->current_bss = NULL; 1181 } 1182 } 1183 1184 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 1185 { 1186 _cfg80211_unregister_wdev(wdev, true); 1187 } 1188 EXPORT_SYMBOL(cfg80211_unregister_wdev); 1189 1190 static const struct device_type wiphy_type = { 1191 .name = "wlan", 1192 }; 1193 1194 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 1195 enum nl80211_iftype iftype, int num) 1196 { 1197 lockdep_assert_held(&rdev->wiphy.mtx); 1198 1199 rdev->num_running_ifaces += num; 1200 if (iftype == NL80211_IFTYPE_MONITOR) 1201 rdev->num_running_monitor_ifaces += num; 1202 } 1203 1204 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 1205 struct wireless_dev *wdev) 1206 { 1207 struct net_device *dev = wdev->netdev; 1208 struct cfg80211_sched_scan_request *pos, *tmp; 1209 1210 lockdep_assert_held(&rdev->wiphy.mtx); 1211 ASSERT_WDEV_LOCK(wdev); 1212 1213 cfg80211_pmsr_wdev_down(wdev); 1214 1215 switch (wdev->iftype) { 1216 case NL80211_IFTYPE_ADHOC: 1217 __cfg80211_leave_ibss(rdev, dev, true); 1218 break; 1219 case NL80211_IFTYPE_P2P_CLIENT: 1220 case NL80211_IFTYPE_STATION: 1221 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, 1222 list) { 1223 if (dev == pos->dev) 1224 cfg80211_stop_sched_scan_req(rdev, pos, false); 1225 } 1226 1227 #ifdef CONFIG_CFG80211_WEXT 1228 kfree(wdev->wext.ie); 1229 wdev->wext.ie = NULL; 1230 wdev->wext.ie_len = 0; 1231 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1232 #endif 1233 cfg80211_disconnect(rdev, dev, 1234 WLAN_REASON_DEAUTH_LEAVING, true); 1235 break; 1236 case NL80211_IFTYPE_MESH_POINT: 1237 __cfg80211_leave_mesh(rdev, dev); 1238 break; 1239 case NL80211_IFTYPE_AP: 1240 case NL80211_IFTYPE_P2P_GO: 1241 __cfg80211_stop_ap(rdev, dev, true); 1242 break; 1243 case NL80211_IFTYPE_OCB: 1244 __cfg80211_leave_ocb(rdev, dev); 1245 break; 1246 case NL80211_IFTYPE_P2P_DEVICE: 1247 case NL80211_IFTYPE_NAN: 1248 /* cannot happen, has no netdev */ 1249 break; 1250 case NL80211_IFTYPE_AP_VLAN: 1251 case NL80211_IFTYPE_MONITOR: 1252 /* nothing to do */ 1253 break; 1254 case NL80211_IFTYPE_UNSPECIFIED: 1255 case NL80211_IFTYPE_WDS: 1256 case NUM_NL80211_IFTYPES: 1257 /* invalid */ 1258 break; 1259 } 1260 } 1261 1262 void cfg80211_leave(struct cfg80211_registered_device *rdev, 1263 struct wireless_dev *wdev) 1264 { 1265 wdev_lock(wdev); 1266 __cfg80211_leave(rdev, wdev); 1267 wdev_unlock(wdev); 1268 } 1269 1270 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 1271 gfp_t gfp) 1272 { 1273 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1274 struct cfg80211_event *ev; 1275 unsigned long flags; 1276 1277 trace_cfg80211_stop_iface(wiphy, wdev); 1278 1279 ev = kzalloc(sizeof(*ev), gfp); 1280 if (!ev) 1281 return; 1282 1283 ev->type = EVENT_STOPPED; 1284 1285 spin_lock_irqsave(&wdev->event_lock, flags); 1286 list_add_tail(&ev->list, &wdev->event_list); 1287 spin_unlock_irqrestore(&wdev->event_lock, flags); 1288 queue_work(cfg80211_wq, &rdev->event_work); 1289 } 1290 EXPORT_SYMBOL(cfg80211_stop_iface); 1291 1292 void cfg80211_init_wdev(struct wireless_dev *wdev) 1293 { 1294 mutex_init(&wdev->mtx); 1295 INIT_LIST_HEAD(&wdev->event_list); 1296 spin_lock_init(&wdev->event_lock); 1297 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1298 spin_lock_init(&wdev->mgmt_registrations_lock); 1299 INIT_LIST_HEAD(&wdev->pmsr_list); 1300 spin_lock_init(&wdev->pmsr_lock); 1301 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk); 1302 1303 #ifdef CONFIG_CFG80211_WEXT 1304 wdev->wext.default_key = -1; 1305 wdev->wext.default_mgmt_key = -1; 1306 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1307 #endif 1308 1309 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1310 wdev->ps = true; 1311 else 1312 wdev->ps = false; 1313 /* allow mac80211 to determine the timeout */ 1314 wdev->ps_timeout = -1; 1315 1316 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1317 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1318 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1319 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE; 1320 1321 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk); 1322 } 1323 1324 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev, 1325 struct wireless_dev *wdev) 1326 { 1327 ASSERT_RTNL(); 1328 lockdep_assert_held(&rdev->wiphy.mtx); 1329 1330 /* 1331 * We get here also when the interface changes network namespaces, 1332 * as it's registered into the new one, but we don't want it to 1333 * change ID in that case. Checking if the ID is already assigned 1334 * works, because 0 isn't considered a valid ID and the memory is 1335 * 0-initialized. 1336 */ 1337 if (!wdev->identifier) 1338 wdev->identifier = ++rdev->wdev_id; 1339 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list); 1340 rdev->devlist_generation++; 1341 wdev->registered = true; 1342 1343 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 1344 } 1345 1346 int cfg80211_register_netdevice(struct net_device *dev) 1347 { 1348 struct wireless_dev *wdev = dev->ieee80211_ptr; 1349 struct cfg80211_registered_device *rdev; 1350 int ret; 1351 1352 ASSERT_RTNL(); 1353 1354 if (WARN_ON(!wdev)) 1355 return -EINVAL; 1356 1357 rdev = wiphy_to_rdev(wdev->wiphy); 1358 1359 lockdep_assert_held(&rdev->wiphy.mtx); 1360 1361 /* we'll take care of this */ 1362 wdev->registered = true; 1363 wdev->registering = true; 1364 ret = register_netdevice(dev); 1365 if (ret) 1366 goto out; 1367 1368 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 1369 "phy80211")) { 1370 pr_err("failed to add phy80211 symlink to netdev!\n"); 1371 unregister_netdevice(dev); 1372 ret = -EINVAL; 1373 goto out; 1374 } 1375 1376 cfg80211_register_wdev(rdev, wdev); 1377 ret = 0; 1378 out: 1379 wdev->registering = false; 1380 if (ret) 1381 wdev->registered = false; 1382 return ret; 1383 } 1384 EXPORT_SYMBOL(cfg80211_register_netdevice); 1385 1386 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 1387 unsigned long state, void *ptr) 1388 { 1389 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1390 struct wireless_dev *wdev = dev->ieee80211_ptr; 1391 struct cfg80211_registered_device *rdev; 1392 struct cfg80211_sched_scan_request *pos, *tmp; 1393 1394 if (!wdev) 1395 return NOTIFY_DONE; 1396 1397 rdev = wiphy_to_rdev(wdev->wiphy); 1398 1399 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 1400 1401 switch (state) { 1402 case NETDEV_POST_INIT: 1403 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 1404 wdev->netdev = dev; 1405 /* can only change netns with wiphy */ 1406 dev->features |= NETIF_F_NETNS_LOCAL; 1407 1408 cfg80211_init_wdev(wdev); 1409 break; 1410 case NETDEV_REGISTER: 1411 if (!wdev->registered) { 1412 wiphy_lock(&rdev->wiphy); 1413 cfg80211_register_wdev(rdev, wdev); 1414 wiphy_unlock(&rdev->wiphy); 1415 } 1416 break; 1417 case NETDEV_UNREGISTER: 1418 /* 1419 * It is possible to get NETDEV_UNREGISTER multiple times, 1420 * so check wdev->registered. 1421 */ 1422 if (wdev->registered && !wdev->registering) { 1423 wiphy_lock(&rdev->wiphy); 1424 _cfg80211_unregister_wdev(wdev, false); 1425 wiphy_unlock(&rdev->wiphy); 1426 } 1427 break; 1428 case NETDEV_GOING_DOWN: 1429 wiphy_lock(&rdev->wiphy); 1430 cfg80211_leave(rdev, wdev); 1431 wiphy_unlock(&rdev->wiphy); 1432 break; 1433 case NETDEV_DOWN: 1434 wiphy_lock(&rdev->wiphy); 1435 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1436 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1437 if (WARN_ON(!rdev->scan_req->notified && 1438 (!rdev->int_scan_req || 1439 !rdev->int_scan_req->notified))) 1440 rdev->scan_req->info.aborted = true; 1441 ___cfg80211_scan_done(rdev, false); 1442 } 1443 1444 list_for_each_entry_safe(pos, tmp, 1445 &rdev->sched_scan_req_list, list) { 1446 if (WARN_ON(pos->dev == wdev->netdev)) 1447 cfg80211_stop_sched_scan_req(rdev, pos, false); 1448 } 1449 1450 rdev->opencount--; 1451 wiphy_unlock(&rdev->wiphy); 1452 wake_up(&rdev->dev_wait); 1453 break; 1454 case NETDEV_UP: 1455 wiphy_lock(&rdev->wiphy); 1456 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1457 wdev_lock(wdev); 1458 switch (wdev->iftype) { 1459 #ifdef CONFIG_CFG80211_WEXT 1460 case NL80211_IFTYPE_ADHOC: 1461 cfg80211_ibss_wext_join(rdev, wdev); 1462 break; 1463 case NL80211_IFTYPE_STATION: 1464 cfg80211_mgd_wext_connect(rdev, wdev); 1465 break; 1466 #endif 1467 #ifdef CONFIG_MAC80211_MESH 1468 case NL80211_IFTYPE_MESH_POINT: 1469 { 1470 /* backward compat code... */ 1471 struct mesh_setup setup; 1472 memcpy(&setup, &default_mesh_setup, 1473 sizeof(setup)); 1474 /* back compat only needed for mesh_id */ 1475 setup.mesh_id = wdev->ssid; 1476 setup.mesh_id_len = wdev->mesh_id_up_len; 1477 if (wdev->mesh_id_up_len) 1478 __cfg80211_join_mesh(rdev, dev, 1479 &setup, 1480 &default_mesh_config); 1481 break; 1482 } 1483 #endif 1484 default: 1485 break; 1486 } 1487 wdev_unlock(wdev); 1488 rdev->opencount++; 1489 1490 /* 1491 * Configure power management to the driver here so that its 1492 * correctly set also after interface type changes etc. 1493 */ 1494 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1495 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1496 rdev->ops->set_power_mgmt && 1497 rdev_set_power_mgmt(rdev, dev, wdev->ps, 1498 wdev->ps_timeout)) { 1499 /* assume this means it's off */ 1500 wdev->ps = false; 1501 } 1502 wiphy_unlock(&rdev->wiphy); 1503 break; 1504 case NETDEV_PRE_UP: 1505 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype, 1506 wdev->use_4addr, 0)) 1507 return notifier_from_errno(-EOPNOTSUPP); 1508 1509 if (rfkill_blocked(rdev->rfkill)) 1510 return notifier_from_errno(-ERFKILL); 1511 break; 1512 default: 1513 return NOTIFY_DONE; 1514 } 1515 1516 wireless_nlevent_flush(); 1517 1518 return NOTIFY_OK; 1519 } 1520 1521 static struct notifier_block cfg80211_netdev_notifier = { 1522 .notifier_call = cfg80211_netdev_notifier_call, 1523 }; 1524 1525 static void __net_exit cfg80211_pernet_exit(struct net *net) 1526 { 1527 struct cfg80211_registered_device *rdev; 1528 1529 rtnl_lock(); 1530 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1531 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1532 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1533 } 1534 rtnl_unlock(); 1535 } 1536 1537 static struct pernet_operations cfg80211_pernet_ops = { 1538 .exit = cfg80211_pernet_exit, 1539 }; 1540 1541 static int __init cfg80211_init(void) 1542 { 1543 int err; 1544 1545 err = register_pernet_device(&cfg80211_pernet_ops); 1546 if (err) 1547 goto out_fail_pernet; 1548 1549 err = wiphy_sysfs_init(); 1550 if (err) 1551 goto out_fail_sysfs; 1552 1553 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1554 if (err) 1555 goto out_fail_notifier; 1556 1557 err = nl80211_init(); 1558 if (err) 1559 goto out_fail_nl80211; 1560 1561 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1562 1563 err = regulatory_init(); 1564 if (err) 1565 goto out_fail_reg; 1566 1567 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM); 1568 if (!cfg80211_wq) { 1569 err = -ENOMEM; 1570 goto out_fail_wq; 1571 } 1572 1573 return 0; 1574 1575 out_fail_wq: 1576 regulatory_exit(); 1577 out_fail_reg: 1578 debugfs_remove(ieee80211_debugfs_dir); 1579 nl80211_exit(); 1580 out_fail_nl80211: 1581 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1582 out_fail_notifier: 1583 wiphy_sysfs_exit(); 1584 out_fail_sysfs: 1585 unregister_pernet_device(&cfg80211_pernet_ops); 1586 out_fail_pernet: 1587 return err; 1588 } 1589 fs_initcall(cfg80211_init); 1590 1591 static void __exit cfg80211_exit(void) 1592 { 1593 debugfs_remove(ieee80211_debugfs_dir); 1594 nl80211_exit(); 1595 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1596 wiphy_sysfs_exit(); 1597 regulatory_exit(); 1598 unregister_pernet_device(&cfg80211_pernet_ops); 1599 destroy_workqueue(cfg80211_wq); 1600 } 1601 module_exit(cfg80211_exit); 1602