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) 2018-2021 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->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 536 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 537 &rdev->rfkill_ops, rdev); 538 539 if (!rdev->wiphy.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 /* DFS only works on one channel. */ 593 if (WARN_ON(c->radar_detect_widths && 594 (c->num_different_channels > 1))) 595 return -EINVAL; 596 597 if (WARN_ON(!c->n_limits)) 598 return -EINVAL; 599 600 for (j = 0; j < c->n_limits; j++) { 601 u16 types = c->limits[j].types; 602 603 /* interface types shouldn't overlap */ 604 if (WARN_ON(types & all_iftypes)) 605 return -EINVAL; 606 all_iftypes |= types; 607 608 if (WARN_ON(!c->limits[j].max)) 609 return -EINVAL; 610 611 /* Shouldn't list software iftypes in combinations! */ 612 if (WARN_ON(wiphy->software_iftypes & types)) 613 return -EINVAL; 614 615 /* Only a single P2P_DEVICE can be allowed */ 616 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 617 c->limits[j].max > 1)) 618 return -EINVAL; 619 620 /* Only a single NAN can be allowed */ 621 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) && 622 c->limits[j].max > 1)) 623 return -EINVAL; 624 625 /* 626 * This isn't well-defined right now. If you have an 627 * IBSS interface, then its beacon interval may change 628 * by joining other networks, and nothing prevents it 629 * from doing that. 630 * So technically we probably shouldn't even allow AP 631 * and IBSS in the same interface, but it seems that 632 * some drivers support that, possibly only with fixed 633 * beacon intervals for IBSS. 634 */ 635 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) && 636 c->beacon_int_min_gcd)) { 637 return -EINVAL; 638 } 639 640 cnt += c->limits[j].max; 641 /* 642 * Don't advertise an unsupported type 643 * in a combination. 644 */ 645 if (WARN_ON((wiphy->interface_modes & types) != types)) 646 return -EINVAL; 647 } 648 649 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS))) 650 return -EINVAL; 651 652 /* You can't even choose that many! */ 653 if (WARN_ON(cnt < c->max_interfaces)) 654 return -EINVAL; 655 } 656 657 return 0; 658 } 659 660 int wiphy_register(struct wiphy *wiphy) 661 { 662 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 663 int res; 664 enum nl80211_band band; 665 struct ieee80211_supported_band *sband; 666 bool have_band = false; 667 int i; 668 u16 ifmodes = wiphy->interface_modes; 669 670 #ifdef CONFIG_PM 671 if (WARN_ON(wiphy->wowlan && 672 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 673 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 674 return -EINVAL; 675 if (WARN_ON(wiphy->wowlan && 676 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 677 !wiphy->wowlan->tcp)) 678 return -EINVAL; 679 #endif 680 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 681 (!rdev->ops->tdls_channel_switch || 682 !rdev->ops->tdls_cancel_channel_switch))) 683 return -EINVAL; 684 685 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) && 686 (!rdev->ops->start_nan || !rdev->ops->stop_nan || 687 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func || 688 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ))))) 689 return -EINVAL; 690 691 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))) 692 return -EINVAL; 693 694 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported)) 695 return -EINVAL; 696 697 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) { 698 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap && 699 !wiphy->pmsr_capa->ftm.non_asap)) 700 return -EINVAL; 701 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles || 702 !wiphy->pmsr_capa->ftm.bandwidths)) 703 return -EINVAL; 704 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles & 705 ~(BIT(NL80211_PREAMBLE_LEGACY) | 706 BIT(NL80211_PREAMBLE_HT) | 707 BIT(NL80211_PREAMBLE_VHT) | 708 BIT(NL80211_PREAMBLE_HE) | 709 BIT(NL80211_PREAMBLE_DMG)))) 710 return -EINVAL; 711 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based || 712 wiphy->pmsr_capa->ftm.non_trigger_based) && 713 !(wiphy->pmsr_capa->ftm.preambles & 714 BIT(NL80211_PREAMBLE_HE)))) 715 return -EINVAL; 716 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths & 717 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) | 718 BIT(NL80211_CHAN_WIDTH_20) | 719 BIT(NL80211_CHAN_WIDTH_40) | 720 BIT(NL80211_CHAN_WIDTH_80) | 721 BIT(NL80211_CHAN_WIDTH_80P80) | 722 BIT(NL80211_CHAN_WIDTH_160) | 723 BIT(NL80211_CHAN_WIDTH_5) | 724 BIT(NL80211_CHAN_WIDTH_10)))) 725 return -EINVAL; 726 } 727 728 /* 729 * if a wiphy has unsupported modes for regulatory channel enforcement, 730 * opt-out of enforcement checking 731 */ 732 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) | 733 BIT(NL80211_IFTYPE_P2P_CLIENT) | 734 BIT(NL80211_IFTYPE_AP) | 735 BIT(NL80211_IFTYPE_P2P_GO) | 736 BIT(NL80211_IFTYPE_ADHOC) | 737 BIT(NL80211_IFTYPE_P2P_DEVICE) | 738 BIT(NL80211_IFTYPE_NAN) | 739 BIT(NL80211_IFTYPE_AP_VLAN) | 740 BIT(NL80211_IFTYPE_MONITOR))) 741 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF; 742 743 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 744 (wiphy->regulatory_flags & 745 (REGULATORY_CUSTOM_REG | 746 REGULATORY_STRICT_REG | 747 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 748 REGULATORY_COUNTRY_IE_IGNORE)))) 749 return -EINVAL; 750 751 if (WARN_ON(wiphy->coalesce && 752 (!wiphy->coalesce->n_rules || 753 !wiphy->coalesce->n_patterns) && 754 (!wiphy->coalesce->pattern_min_len || 755 wiphy->coalesce->pattern_min_len > 756 wiphy->coalesce->pattern_max_len))) 757 return -EINVAL; 758 759 if (WARN_ON(wiphy->ap_sme_capa && 760 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 761 return -EINVAL; 762 763 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 764 return -EINVAL; 765 766 if (WARN_ON(wiphy->addresses && 767 !is_zero_ether_addr(wiphy->perm_addr) && 768 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 769 ETH_ALEN))) 770 return -EINVAL; 771 772 if (WARN_ON(wiphy->max_acl_mac_addrs && 773 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 774 !rdev->ops->set_mac_acl))) 775 return -EINVAL; 776 777 /* assure only valid behaviours are flagged by driver 778 * hence subtract 2 as bit 0 is invalid. 779 */ 780 if (WARN_ON(wiphy->bss_select_support && 781 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 782 return -EINVAL; 783 784 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy, 785 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) && 786 (!rdev->ops->set_pmk || !rdev->ops->del_pmk))) 787 return -EINVAL; 788 789 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) && 790 rdev->ops->update_connect_params)) 791 return -EINVAL; 792 793 if (wiphy->addresses) 794 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 795 796 /* sanity check ifmodes */ 797 WARN_ON(!ifmodes); 798 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 799 if (WARN_ON(ifmodes != wiphy->interface_modes)) 800 wiphy->interface_modes = ifmodes; 801 802 res = wiphy_verify_combinations(wiphy); 803 if (res) 804 return res; 805 806 /* sanity check supported bands/channels */ 807 for (band = 0; band < NUM_NL80211_BANDS; band++) { 808 u16 types = 0; 809 bool have_he = false; 810 811 sband = wiphy->bands[band]; 812 if (!sband) 813 continue; 814 815 sband->band = band; 816 if (WARN_ON(!sband->n_channels)) 817 return -EINVAL; 818 /* 819 * on 60GHz or sub-1Ghz band, there are no legacy rates, so 820 * n_bitrates is 0 821 */ 822 if (WARN_ON((band != NL80211_BAND_60GHZ && 823 band != NL80211_BAND_S1GHZ) && 824 !sband->n_bitrates)) 825 return -EINVAL; 826 827 if (WARN_ON(band == NL80211_BAND_6GHZ && 828 (sband->ht_cap.ht_supported || 829 sband->vht_cap.vht_supported))) 830 return -EINVAL; 831 832 /* 833 * Since cfg80211_disable_40mhz_24ghz is global, we can 834 * modify the sband's ht data even if the driver uses a 835 * global structure for that. 836 */ 837 if (cfg80211_disable_40mhz_24ghz && 838 band == NL80211_BAND_2GHZ && 839 sband->ht_cap.ht_supported) { 840 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 841 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 842 } 843 844 /* 845 * Since we use a u32 for rate bitmaps in 846 * ieee80211_get_response_rate, we cannot 847 * have more than 32 legacy rates. 848 */ 849 if (WARN_ON(sband->n_bitrates > 32)) 850 return -EINVAL; 851 852 for (i = 0; i < sband->n_channels; i++) { 853 sband->channels[i].orig_flags = 854 sband->channels[i].flags; 855 sband->channels[i].orig_mag = INT_MAX; 856 sband->channels[i].orig_mpwr = 857 sband->channels[i].max_power; 858 sband->channels[i].band = band; 859 860 if (WARN_ON(sband->channels[i].freq_offset >= 1000)) 861 return -EINVAL; 862 } 863 864 for (i = 0; i < sband->n_iftype_data; i++) { 865 const struct ieee80211_sband_iftype_data *iftd; 866 867 iftd = &sband->iftype_data[i]; 868 869 if (WARN_ON(!iftd->types_mask)) 870 return -EINVAL; 871 if (WARN_ON(types & iftd->types_mask)) 872 return -EINVAL; 873 874 /* at least one piece of information must be present */ 875 if (WARN_ON(!iftd->he_cap.has_he)) 876 return -EINVAL; 877 878 types |= iftd->types_mask; 879 880 if (i == 0) 881 have_he = iftd->he_cap.has_he; 882 else 883 have_he = have_he && 884 iftd->he_cap.has_he; 885 } 886 887 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ)) 888 return -EINVAL; 889 890 have_band = true; 891 } 892 893 if (!have_band) { 894 WARN_ON(1); 895 return -EINVAL; 896 } 897 898 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) { 899 /* 900 * Validate we have a policy (can be explicitly set to 901 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that 902 * we have at least one of doit/dumpit. 903 */ 904 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy)) 905 return -EINVAL; 906 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit && 907 !rdev->wiphy.vendor_commands[i].dumpit)) 908 return -EINVAL; 909 } 910 911 #ifdef CONFIG_PM 912 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 913 (!rdev->wiphy.wowlan->pattern_min_len || 914 rdev->wiphy.wowlan->pattern_min_len > 915 rdev->wiphy.wowlan->pattern_max_len))) 916 return -EINVAL; 917 #endif 918 919 /* check and set up bitrates */ 920 ieee80211_set_bitrate_flags(wiphy); 921 922 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 923 924 rtnl_lock(); 925 res = device_add(&rdev->wiphy.dev); 926 if (res) { 927 rtnl_unlock(); 928 return res; 929 } 930 931 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 932 cfg80211_rdev_list_generation++; 933 934 /* add to debugfs */ 935 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy), 936 ieee80211_debugfs_dir); 937 938 cfg80211_debugfs_rdev_add(rdev); 939 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 940 941 /* set up regulatory info */ 942 wiphy_regulatory_register(wiphy); 943 944 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 945 struct regulatory_request request; 946 947 request.wiphy_idx = get_wiphy_idx(wiphy); 948 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 949 request.alpha2[0] = '9'; 950 request.alpha2[1] = '9'; 951 952 nl80211_send_reg_change_event(&request); 953 } 954 955 /* Check that nobody globally advertises any capabilities they do not 956 * advertise on all possible interface types. 957 */ 958 if (wiphy->extended_capabilities_len && 959 wiphy->num_iftype_ext_capab && 960 wiphy->iftype_ext_capab) { 961 u8 supported_on_all, j; 962 const struct wiphy_iftype_ext_capab *capab; 963 964 capab = wiphy->iftype_ext_capab; 965 for (j = 0; j < wiphy->extended_capabilities_len; j++) { 966 if (capab[0].extended_capabilities_len > j) 967 supported_on_all = 968 capab[0].extended_capabilities[j]; 969 else 970 supported_on_all = 0x00; 971 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) { 972 if (j >= capab[i].extended_capabilities_len) { 973 supported_on_all = 0x00; 974 break; 975 } 976 supported_on_all &= 977 capab[i].extended_capabilities[j]; 978 } 979 if (WARN_ON(wiphy->extended_capabilities[j] & 980 ~supported_on_all)) 981 break; 982 } 983 } 984 985 rdev->wiphy.registered = true; 986 rtnl_unlock(); 987 988 res = rfkill_register(rdev->wiphy.rfkill); 989 if (res) { 990 rfkill_destroy(rdev->wiphy.rfkill); 991 rdev->wiphy.rfkill = NULL; 992 wiphy_unregister(&rdev->wiphy); 993 return res; 994 } 995 996 return 0; 997 } 998 EXPORT_SYMBOL(wiphy_register); 999 1000 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 1001 { 1002 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1003 1004 if (!rdev->ops->rfkill_poll) 1005 return; 1006 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 1007 rfkill_resume_polling(wiphy->rfkill); 1008 } 1009 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 1010 1011 void wiphy_unregister(struct wiphy *wiphy) 1012 { 1013 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1014 1015 wait_event(rdev->dev_wait, ({ 1016 int __count; 1017 wiphy_lock(&rdev->wiphy); 1018 __count = rdev->opencount; 1019 wiphy_unlock(&rdev->wiphy); 1020 __count == 0; })); 1021 1022 if (rdev->wiphy.rfkill) 1023 rfkill_unregister(rdev->wiphy.rfkill); 1024 1025 rtnl_lock(); 1026 wiphy_lock(&rdev->wiphy); 1027 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 1028 rdev->wiphy.registered = false; 1029 1030 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 1031 1032 /* 1033 * First remove the hardware from everywhere, this makes 1034 * it impossible to find from userspace. 1035 */ 1036 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 1037 list_del_rcu(&rdev->list); 1038 synchronize_rcu(); 1039 1040 /* 1041 * If this device got a regulatory hint tell core its 1042 * free to listen now to a new shiny device regulatory hint 1043 */ 1044 wiphy_regulatory_deregister(wiphy); 1045 1046 cfg80211_rdev_list_generation++; 1047 device_del(&rdev->wiphy.dev); 1048 1049 wiphy_unlock(&rdev->wiphy); 1050 rtnl_unlock(); 1051 1052 flush_work(&rdev->scan_done_wk); 1053 cancel_work_sync(&rdev->conn_work); 1054 flush_work(&rdev->event_work); 1055 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 1056 flush_work(&rdev->destroy_work); 1057 flush_work(&rdev->sched_scan_stop_wk); 1058 flush_work(&rdev->propagate_radar_detect_wk); 1059 flush_work(&rdev->propagate_cac_done_wk); 1060 flush_work(&rdev->mgmt_registrations_update_wk); 1061 1062 #ifdef CONFIG_PM 1063 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 1064 rdev_set_wakeup(rdev, false); 1065 #endif 1066 cfg80211_rdev_free_wowlan(rdev); 1067 cfg80211_rdev_free_coalesce(rdev); 1068 } 1069 EXPORT_SYMBOL(wiphy_unregister); 1070 1071 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 1072 { 1073 struct cfg80211_internal_bss *scan, *tmp; 1074 struct cfg80211_beacon_registration *reg, *treg; 1075 rfkill_destroy(rdev->wiphy.rfkill); 1076 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 1077 list_del(®->list); 1078 kfree(reg); 1079 } 1080 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 1081 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 1082 mutex_destroy(&rdev->wiphy.mtx); 1083 kfree(rdev); 1084 } 1085 1086 void wiphy_free(struct wiphy *wiphy) 1087 { 1088 put_device(&wiphy->dev); 1089 } 1090 EXPORT_SYMBOL(wiphy_free); 1091 1092 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked, 1093 enum rfkill_hard_block_reasons reason) 1094 { 1095 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1096 1097 if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason)) 1098 schedule_work(&rdev->rfkill_block); 1099 } 1100 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason); 1101 1102 void cfg80211_cqm_config_free(struct wireless_dev *wdev) 1103 { 1104 kfree(wdev->cqm_config); 1105 wdev->cqm_config = NULL; 1106 } 1107 1108 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev, 1109 bool unregister_netdev) 1110 { 1111 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1112 1113 ASSERT_RTNL(); 1114 lockdep_assert_held(&rdev->wiphy.mtx); 1115 1116 flush_work(&wdev->pmsr_free_wk); 1117 1118 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 1119 1120 wdev->registered = false; 1121 1122 if (wdev->netdev) { 1123 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211"); 1124 if (unregister_netdev) 1125 unregister_netdevice(wdev->netdev); 1126 } 1127 1128 list_del_rcu(&wdev->list); 1129 synchronize_net(); 1130 rdev->devlist_generation++; 1131 1132 cfg80211_mlme_purge_registrations(wdev); 1133 1134 switch (wdev->iftype) { 1135 case NL80211_IFTYPE_P2P_DEVICE: 1136 cfg80211_stop_p2p_device(rdev, wdev); 1137 break; 1138 case NL80211_IFTYPE_NAN: 1139 cfg80211_stop_nan(rdev, wdev); 1140 break; 1141 default: 1142 break; 1143 } 1144 1145 #ifdef CONFIG_CFG80211_WEXT 1146 kfree_sensitive(wdev->wext.keys); 1147 wdev->wext.keys = NULL; 1148 #endif 1149 /* only initialized if we have a netdev */ 1150 if (wdev->netdev) 1151 flush_work(&wdev->disconnect_wk); 1152 1153 cfg80211_cqm_config_free(wdev); 1154 1155 /* 1156 * Ensure that all events have been processed and 1157 * freed. 1158 */ 1159 cfg80211_process_wdev_events(wdev); 1160 1161 if (WARN_ON(wdev->current_bss)) { 1162 cfg80211_unhold_bss(wdev->current_bss); 1163 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 1164 wdev->current_bss = NULL; 1165 } 1166 } 1167 1168 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 1169 { 1170 _cfg80211_unregister_wdev(wdev, true); 1171 } 1172 EXPORT_SYMBOL(cfg80211_unregister_wdev); 1173 1174 static const struct device_type wiphy_type = { 1175 .name = "wlan", 1176 }; 1177 1178 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 1179 enum nl80211_iftype iftype, int num) 1180 { 1181 lockdep_assert_held(&rdev->wiphy.mtx); 1182 1183 rdev->num_running_ifaces += num; 1184 if (iftype == NL80211_IFTYPE_MONITOR) 1185 rdev->num_running_monitor_ifaces += num; 1186 } 1187 1188 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 1189 struct wireless_dev *wdev) 1190 { 1191 struct net_device *dev = wdev->netdev; 1192 struct cfg80211_sched_scan_request *pos, *tmp; 1193 1194 lockdep_assert_held(&rdev->wiphy.mtx); 1195 ASSERT_WDEV_LOCK(wdev); 1196 1197 cfg80211_pmsr_wdev_down(wdev); 1198 1199 switch (wdev->iftype) { 1200 case NL80211_IFTYPE_ADHOC: 1201 __cfg80211_leave_ibss(rdev, dev, true); 1202 break; 1203 case NL80211_IFTYPE_P2P_CLIENT: 1204 case NL80211_IFTYPE_STATION: 1205 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, 1206 list) { 1207 if (dev == pos->dev) 1208 cfg80211_stop_sched_scan_req(rdev, pos, false); 1209 } 1210 1211 #ifdef CONFIG_CFG80211_WEXT 1212 kfree(wdev->wext.ie); 1213 wdev->wext.ie = NULL; 1214 wdev->wext.ie_len = 0; 1215 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1216 #endif 1217 cfg80211_disconnect(rdev, dev, 1218 WLAN_REASON_DEAUTH_LEAVING, true); 1219 break; 1220 case NL80211_IFTYPE_MESH_POINT: 1221 __cfg80211_leave_mesh(rdev, dev); 1222 break; 1223 case NL80211_IFTYPE_AP: 1224 case NL80211_IFTYPE_P2P_GO: 1225 __cfg80211_stop_ap(rdev, dev, true); 1226 break; 1227 case NL80211_IFTYPE_OCB: 1228 __cfg80211_leave_ocb(rdev, dev); 1229 break; 1230 case NL80211_IFTYPE_P2P_DEVICE: 1231 case NL80211_IFTYPE_NAN: 1232 /* cannot happen, has no netdev */ 1233 break; 1234 case NL80211_IFTYPE_AP_VLAN: 1235 case NL80211_IFTYPE_MONITOR: 1236 /* nothing to do */ 1237 break; 1238 case NL80211_IFTYPE_UNSPECIFIED: 1239 case NL80211_IFTYPE_WDS: 1240 case NUM_NL80211_IFTYPES: 1241 /* invalid */ 1242 break; 1243 } 1244 } 1245 1246 void cfg80211_leave(struct cfg80211_registered_device *rdev, 1247 struct wireless_dev *wdev) 1248 { 1249 wdev_lock(wdev); 1250 __cfg80211_leave(rdev, wdev); 1251 wdev_unlock(wdev); 1252 } 1253 1254 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 1255 gfp_t gfp) 1256 { 1257 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1258 struct cfg80211_event *ev; 1259 unsigned long flags; 1260 1261 trace_cfg80211_stop_iface(wiphy, wdev); 1262 1263 ev = kzalloc(sizeof(*ev), gfp); 1264 if (!ev) 1265 return; 1266 1267 ev->type = EVENT_STOPPED; 1268 1269 spin_lock_irqsave(&wdev->event_lock, flags); 1270 list_add_tail(&ev->list, &wdev->event_list); 1271 spin_unlock_irqrestore(&wdev->event_lock, flags); 1272 queue_work(cfg80211_wq, &rdev->event_work); 1273 } 1274 EXPORT_SYMBOL(cfg80211_stop_iface); 1275 1276 void cfg80211_init_wdev(struct wireless_dev *wdev) 1277 { 1278 mutex_init(&wdev->mtx); 1279 INIT_LIST_HEAD(&wdev->event_list); 1280 spin_lock_init(&wdev->event_lock); 1281 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1282 spin_lock_init(&wdev->mgmt_registrations_lock); 1283 INIT_LIST_HEAD(&wdev->pmsr_list); 1284 spin_lock_init(&wdev->pmsr_lock); 1285 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk); 1286 1287 #ifdef CONFIG_CFG80211_WEXT 1288 wdev->wext.default_key = -1; 1289 wdev->wext.default_mgmt_key = -1; 1290 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1291 #endif 1292 1293 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1294 wdev->ps = true; 1295 else 1296 wdev->ps = false; 1297 /* allow mac80211 to determine the timeout */ 1298 wdev->ps_timeout = -1; 1299 1300 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1301 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1302 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1303 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE; 1304 1305 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk); 1306 } 1307 1308 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev, 1309 struct wireless_dev *wdev) 1310 { 1311 ASSERT_RTNL(); 1312 lockdep_assert_held(&rdev->wiphy.mtx); 1313 1314 /* 1315 * We get here also when the interface changes network namespaces, 1316 * as it's registered into the new one, but we don't want it to 1317 * change ID in that case. Checking if the ID is already assigned 1318 * works, because 0 isn't considered a valid ID and the memory is 1319 * 0-initialized. 1320 */ 1321 if (!wdev->identifier) 1322 wdev->identifier = ++rdev->wdev_id; 1323 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list); 1324 rdev->devlist_generation++; 1325 wdev->registered = true; 1326 1327 if (wdev->netdev && 1328 sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj, 1329 "phy80211")) 1330 pr_err("failed to add phy80211 symlink to netdev!\n"); 1331 1332 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 1333 } 1334 1335 int cfg80211_register_netdevice(struct net_device *dev) 1336 { 1337 struct wireless_dev *wdev = dev->ieee80211_ptr; 1338 struct cfg80211_registered_device *rdev; 1339 int ret; 1340 1341 ASSERT_RTNL(); 1342 1343 if (WARN_ON(!wdev)) 1344 return -EINVAL; 1345 1346 rdev = wiphy_to_rdev(wdev->wiphy); 1347 1348 lockdep_assert_held(&rdev->wiphy.mtx); 1349 1350 /* we'll take care of this */ 1351 wdev->registered = true; 1352 wdev->registering = true; 1353 ret = register_netdevice(dev); 1354 if (ret) 1355 goto out; 1356 1357 cfg80211_register_wdev(rdev, wdev); 1358 ret = 0; 1359 out: 1360 wdev->registering = false; 1361 if (ret) 1362 wdev->registered = false; 1363 return ret; 1364 } 1365 EXPORT_SYMBOL(cfg80211_register_netdevice); 1366 1367 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 1368 unsigned long state, void *ptr) 1369 { 1370 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1371 struct wireless_dev *wdev = dev->ieee80211_ptr; 1372 struct cfg80211_registered_device *rdev; 1373 struct cfg80211_sched_scan_request *pos, *tmp; 1374 1375 if (!wdev) 1376 return NOTIFY_DONE; 1377 1378 rdev = wiphy_to_rdev(wdev->wiphy); 1379 1380 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 1381 1382 switch (state) { 1383 case NETDEV_POST_INIT: 1384 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 1385 wdev->netdev = dev; 1386 /* can only change netns with wiphy */ 1387 dev->features |= NETIF_F_NETNS_LOCAL; 1388 1389 cfg80211_init_wdev(wdev); 1390 break; 1391 case NETDEV_REGISTER: 1392 if (!wdev->registered) { 1393 wiphy_lock(&rdev->wiphy); 1394 cfg80211_register_wdev(rdev, wdev); 1395 wiphy_unlock(&rdev->wiphy); 1396 } 1397 break; 1398 case NETDEV_UNREGISTER: 1399 /* 1400 * It is possible to get NETDEV_UNREGISTER multiple times, 1401 * so check wdev->registered. 1402 */ 1403 if (wdev->registered && !wdev->registering) { 1404 wiphy_lock(&rdev->wiphy); 1405 _cfg80211_unregister_wdev(wdev, false); 1406 wiphy_unlock(&rdev->wiphy); 1407 } 1408 break; 1409 case NETDEV_GOING_DOWN: 1410 wiphy_lock(&rdev->wiphy); 1411 cfg80211_leave(rdev, wdev); 1412 wiphy_unlock(&rdev->wiphy); 1413 break; 1414 case NETDEV_DOWN: 1415 wiphy_lock(&rdev->wiphy); 1416 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1417 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1418 if (WARN_ON(!rdev->scan_req->notified && 1419 (!rdev->int_scan_req || 1420 !rdev->int_scan_req->notified))) 1421 rdev->scan_req->info.aborted = true; 1422 ___cfg80211_scan_done(rdev, false); 1423 } 1424 1425 list_for_each_entry_safe(pos, tmp, 1426 &rdev->sched_scan_req_list, list) { 1427 if (WARN_ON(pos->dev == wdev->netdev)) 1428 cfg80211_stop_sched_scan_req(rdev, pos, false); 1429 } 1430 1431 rdev->opencount--; 1432 wiphy_unlock(&rdev->wiphy); 1433 wake_up(&rdev->dev_wait); 1434 break; 1435 case NETDEV_UP: 1436 wiphy_lock(&rdev->wiphy); 1437 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1438 wdev_lock(wdev); 1439 switch (wdev->iftype) { 1440 #ifdef CONFIG_CFG80211_WEXT 1441 case NL80211_IFTYPE_ADHOC: 1442 cfg80211_ibss_wext_join(rdev, wdev); 1443 break; 1444 case NL80211_IFTYPE_STATION: 1445 cfg80211_mgd_wext_connect(rdev, wdev); 1446 break; 1447 #endif 1448 #ifdef CONFIG_MAC80211_MESH 1449 case NL80211_IFTYPE_MESH_POINT: 1450 { 1451 /* backward compat code... */ 1452 struct mesh_setup setup; 1453 memcpy(&setup, &default_mesh_setup, 1454 sizeof(setup)); 1455 /* back compat only needed for mesh_id */ 1456 setup.mesh_id = wdev->ssid; 1457 setup.mesh_id_len = wdev->mesh_id_up_len; 1458 if (wdev->mesh_id_up_len) 1459 __cfg80211_join_mesh(rdev, dev, 1460 &setup, 1461 &default_mesh_config); 1462 break; 1463 } 1464 #endif 1465 default: 1466 break; 1467 } 1468 wdev_unlock(wdev); 1469 rdev->opencount++; 1470 1471 /* 1472 * Configure power management to the driver here so that its 1473 * correctly set also after interface type changes etc. 1474 */ 1475 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1476 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1477 rdev->ops->set_power_mgmt && 1478 rdev_set_power_mgmt(rdev, dev, wdev->ps, 1479 wdev->ps_timeout)) { 1480 /* assume this means it's off */ 1481 wdev->ps = false; 1482 } 1483 wiphy_unlock(&rdev->wiphy); 1484 break; 1485 case NETDEV_PRE_UP: 1486 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype, 1487 wdev->use_4addr, 0)) 1488 return notifier_from_errno(-EOPNOTSUPP); 1489 1490 if (rfkill_blocked(rdev->wiphy.rfkill)) 1491 return notifier_from_errno(-ERFKILL); 1492 break; 1493 default: 1494 return NOTIFY_DONE; 1495 } 1496 1497 wireless_nlevent_flush(); 1498 1499 return NOTIFY_OK; 1500 } 1501 1502 static struct notifier_block cfg80211_netdev_notifier = { 1503 .notifier_call = cfg80211_netdev_notifier_call, 1504 }; 1505 1506 static void __net_exit cfg80211_pernet_exit(struct net *net) 1507 { 1508 struct cfg80211_registered_device *rdev; 1509 1510 rtnl_lock(); 1511 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1512 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1513 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1514 } 1515 rtnl_unlock(); 1516 } 1517 1518 static struct pernet_operations cfg80211_pernet_ops = { 1519 .exit = cfg80211_pernet_exit, 1520 }; 1521 1522 static int __init cfg80211_init(void) 1523 { 1524 int err; 1525 1526 err = register_pernet_device(&cfg80211_pernet_ops); 1527 if (err) 1528 goto out_fail_pernet; 1529 1530 err = wiphy_sysfs_init(); 1531 if (err) 1532 goto out_fail_sysfs; 1533 1534 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1535 if (err) 1536 goto out_fail_notifier; 1537 1538 err = nl80211_init(); 1539 if (err) 1540 goto out_fail_nl80211; 1541 1542 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1543 1544 err = regulatory_init(); 1545 if (err) 1546 goto out_fail_reg; 1547 1548 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM); 1549 if (!cfg80211_wq) { 1550 err = -ENOMEM; 1551 goto out_fail_wq; 1552 } 1553 1554 return 0; 1555 1556 out_fail_wq: 1557 regulatory_exit(); 1558 out_fail_reg: 1559 debugfs_remove(ieee80211_debugfs_dir); 1560 nl80211_exit(); 1561 out_fail_nl80211: 1562 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1563 out_fail_notifier: 1564 wiphy_sysfs_exit(); 1565 out_fail_sysfs: 1566 unregister_pernet_device(&cfg80211_pernet_ops); 1567 out_fail_pernet: 1568 return err; 1569 } 1570 fs_initcall(cfg80211_init); 1571 1572 static void __exit cfg80211_exit(void) 1573 { 1574 debugfs_remove(ieee80211_debugfs_dir); 1575 nl80211_exit(); 1576 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1577 wiphy_sysfs_exit(); 1578 regulatory_exit(); 1579 unregister_pernet_device(&cfg80211_pernet_ops); 1580 destroy_workqueue(cfg80211_wq); 1581 } 1582 module_exit(cfg80211_exit); 1583