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(); 132 133 /* 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; 335 336 ASSERT_RTNL(); 337 338 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) { 339 if (wdev->nl_owner_dead) { 340 if (wdev->netdev) 341 dev_close(wdev->netdev); 342 343 wiphy_lock(&rdev->wiphy); 344 cfg80211_leave(rdev, wdev); 345 rdev_del_virtual_intf(rdev, wdev); 346 wiphy_unlock(&rdev->wiphy); 347 } 348 } 349 } 350 351 static void cfg80211_destroy_iface_wk(struct work_struct *work) 352 { 353 struct cfg80211_registered_device *rdev; 354 355 rdev = container_of(work, struct cfg80211_registered_device, 356 destroy_work); 357 358 rtnl_lock(); 359 cfg80211_destroy_ifaces(rdev); 360 rtnl_unlock(); 361 } 362 363 static void cfg80211_sched_scan_stop_wk(struct work_struct *work) 364 { 365 struct cfg80211_registered_device *rdev; 366 struct cfg80211_sched_scan_request *req, *tmp; 367 368 rdev = container_of(work, struct cfg80211_registered_device, 369 sched_scan_stop_wk); 370 371 rtnl_lock(); 372 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { 373 if (req->nl_owner_dead) 374 cfg80211_stop_sched_scan_req(rdev, req, false); 375 } 376 rtnl_unlock(); 377 } 378 379 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work) 380 { 381 struct cfg80211_registered_device *rdev; 382 383 rdev = container_of(work, struct cfg80211_registered_device, 384 propagate_radar_detect_wk); 385 386 rtnl_lock(); 387 388 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef, 389 NL80211_DFS_UNAVAILABLE, 390 NL80211_RADAR_DETECTED); 391 392 rtnl_unlock(); 393 } 394 395 static void cfg80211_propagate_cac_done_wk(struct work_struct *work) 396 { 397 struct cfg80211_registered_device *rdev; 398 399 rdev = container_of(work, struct cfg80211_registered_device, 400 propagate_cac_done_wk); 401 402 rtnl_lock(); 403 404 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef, 405 NL80211_DFS_AVAILABLE, 406 NL80211_RADAR_CAC_FINISHED); 407 408 rtnl_unlock(); 409 } 410 411 /* exported functions */ 412 413 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, 414 const char *requested_name) 415 { 416 static atomic_t wiphy_counter = ATOMIC_INIT(0); 417 418 struct cfg80211_registered_device *rdev; 419 int alloc_size; 420 421 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 422 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 423 WARN_ON(ops->connect && !ops->disconnect); 424 WARN_ON(ops->join_ibss && !ops->leave_ibss); 425 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 426 WARN_ON(ops->add_station && !ops->del_station); 427 WARN_ON(ops->add_mpath && !ops->del_mpath); 428 WARN_ON(ops->join_mesh && !ops->leave_mesh); 429 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device); 430 WARN_ON(ops->start_ap && !ops->stop_ap); 431 WARN_ON(ops->join_ocb && !ops->leave_ocb); 432 WARN_ON(ops->suspend && !ops->resume); 433 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop); 434 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel); 435 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch); 436 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts); 437 438 alloc_size = sizeof(*rdev) + sizeof_priv; 439 440 rdev = kzalloc(alloc_size, GFP_KERNEL); 441 if (!rdev) 442 return NULL; 443 444 rdev->ops = ops; 445 446 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 447 448 if (unlikely(rdev->wiphy_idx < 0)) { 449 /* ugh, wrapped! */ 450 atomic_dec(&wiphy_counter); 451 kfree(rdev); 452 return NULL; 453 } 454 455 /* atomic_inc_return makes it start at 1, make it start at 0 */ 456 rdev->wiphy_idx--; 457 458 /* give it a proper name */ 459 if (requested_name && requested_name[0]) { 460 int rv; 461 462 rtnl_lock(); 463 rv = cfg80211_dev_check_name(rdev, requested_name); 464 465 if (rv < 0) { 466 rtnl_unlock(); 467 goto use_default_name; 468 } 469 470 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); 471 rtnl_unlock(); 472 if (rv) 473 goto use_default_name; 474 } else { 475 int rv; 476 477 use_default_name: 478 /* NOTE: This is *probably* safe w/out holding rtnl because of 479 * the restrictions on phy names. Probably this call could 480 * fail if some other part of the kernel (re)named a device 481 * phyX. But, might should add some locking and check return 482 * value, and use a different name if this one exists? 483 */ 484 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 485 if (rv < 0) { 486 kfree(rdev); 487 return NULL; 488 } 489 } 490 491 mutex_init(&rdev->wiphy.mtx); 492 INIT_LIST_HEAD(&rdev->wiphy.wdev_list); 493 INIT_LIST_HEAD(&rdev->beacon_registrations); 494 spin_lock_init(&rdev->beacon_registrations_lock); 495 spin_lock_init(&rdev->bss_lock); 496 INIT_LIST_HEAD(&rdev->bss_list); 497 INIT_LIST_HEAD(&rdev->sched_scan_req_list); 498 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 499 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 500 cfg80211_dfs_channels_update_work); 501 #ifdef CONFIG_CFG80211_WEXT 502 rdev->wiphy.wext = &cfg80211_wext_handler; 503 #endif 504 505 device_initialize(&rdev->wiphy.dev); 506 rdev->wiphy.dev.class = &ieee80211_class; 507 rdev->wiphy.dev.platform_data = rdev; 508 device_enable_async_suspend(&rdev->wiphy.dev); 509 510 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 511 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 512 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk); 513 INIT_WORK(&rdev->propagate_radar_detect_wk, 514 cfg80211_propagate_radar_detect_wk); 515 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk); 516 INIT_WORK(&rdev->mgmt_registrations_update_wk, 517 cfg80211_mgmt_registrations_update_wk); 518 spin_lock_init(&rdev->mgmt_registrations_lock); 519 520 #ifdef CONFIG_CFG80211_DEFAULT_PS 521 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 522 #endif 523 524 wiphy_net_set(&rdev->wiphy, &init_net); 525 526 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 527 rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 528 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 529 &rdev->rfkill_ops, rdev); 530 531 if (!rdev->wiphy.rfkill) { 532 wiphy_free(&rdev->wiphy); 533 return NULL; 534 } 535 536 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work); 537 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 538 INIT_WORK(&rdev->event_work, cfg80211_event_work); 539 INIT_WORK(&rdev->background_cac_abort_wk, 540 cfg80211_background_cac_abort_wk); 541 INIT_DELAYED_WORK(&rdev->background_cac_done_wk, 542 cfg80211_background_cac_done_wk); 543 544 init_waitqueue_head(&rdev->dev_wait); 545 546 /* 547 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 548 * Fragmentation and RTS threshold are disabled by default with the 549 * special -1 value. 550 */ 551 rdev->wiphy.retry_short = 7; 552 rdev->wiphy.retry_long = 4; 553 rdev->wiphy.frag_threshold = (u32) -1; 554 rdev->wiphy.rts_threshold = (u32) -1; 555 rdev->wiphy.coverage_class = 0; 556 557 rdev->wiphy.max_num_csa_counters = 1; 558 559 rdev->wiphy.max_sched_scan_plans = 1; 560 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 561 562 return &rdev->wiphy; 563 } 564 EXPORT_SYMBOL(wiphy_new_nm); 565 566 static int wiphy_verify_combinations(struct wiphy *wiphy) 567 { 568 const struct ieee80211_iface_combination *c; 569 int i, j; 570 571 for (i = 0; i < wiphy->n_iface_combinations; i++) { 572 u32 cnt = 0; 573 u16 all_iftypes = 0; 574 575 c = &wiphy->iface_combinations[i]; 576 577 /* 578 * Combinations with just one interface aren't real, 579 * however we make an exception for DFS. 580 */ 581 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 582 return -EINVAL; 583 584 /* Need at least one channel */ 585 if (WARN_ON(!c->num_different_channels)) 586 return -EINVAL; 587 588 /* DFS only works on one channel. */ 589 if (WARN_ON(c->radar_detect_widths && 590 (c->num_different_channels > 1))) 591 return -EINVAL; 592 593 if (WARN_ON(!c->n_limits)) 594 return -EINVAL; 595 596 for (j = 0; j < c->n_limits; j++) { 597 u16 types = c->limits[j].types; 598 599 /* interface types shouldn't overlap */ 600 if (WARN_ON(types & all_iftypes)) 601 return -EINVAL; 602 all_iftypes |= types; 603 604 if (WARN_ON(!c->limits[j].max)) 605 return -EINVAL; 606 607 /* Shouldn't list software iftypes in combinations! */ 608 if (WARN_ON(wiphy->software_iftypes & types)) 609 return -EINVAL; 610 611 /* Only a single P2P_DEVICE can be allowed */ 612 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 613 c->limits[j].max > 1)) 614 return -EINVAL; 615 616 /* Only a single NAN can be allowed */ 617 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) && 618 c->limits[j].max > 1)) 619 return -EINVAL; 620 621 /* 622 * This isn't well-defined right now. If you have an 623 * IBSS interface, then its beacon interval may change 624 * by joining other networks, and nothing prevents it 625 * from doing that. 626 * So technically we probably shouldn't even allow AP 627 * and IBSS in the same interface, but it seems that 628 * some drivers support that, possibly only with fixed 629 * beacon intervals for IBSS. 630 */ 631 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) && 632 c->beacon_int_min_gcd)) { 633 return -EINVAL; 634 } 635 636 cnt += c->limits[j].max; 637 /* 638 * Don't advertise an unsupported type 639 * in a combination. 640 */ 641 if (WARN_ON((wiphy->interface_modes & types) != types)) 642 return -EINVAL; 643 } 644 645 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS))) 646 return -EINVAL; 647 648 /* You can't even choose that many! */ 649 if (WARN_ON(cnt < c->max_interfaces)) 650 return -EINVAL; 651 } 652 653 return 0; 654 } 655 656 int wiphy_register(struct wiphy *wiphy) 657 { 658 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 659 int res; 660 enum nl80211_band band; 661 struct ieee80211_supported_band *sband; 662 bool have_band = false; 663 int i; 664 u16 ifmodes = wiphy->interface_modes; 665 666 #ifdef CONFIG_PM 667 if (WARN_ON(wiphy->wowlan && 668 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 669 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 670 return -EINVAL; 671 if (WARN_ON(wiphy->wowlan && 672 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 673 !wiphy->wowlan->tcp)) 674 return -EINVAL; 675 #endif 676 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 677 (!rdev->ops->tdls_channel_switch || 678 !rdev->ops->tdls_cancel_channel_switch))) 679 return -EINVAL; 680 681 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) && 682 (!rdev->ops->start_nan || !rdev->ops->stop_nan || 683 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func || 684 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ))))) 685 return -EINVAL; 686 687 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))) 688 return -EINVAL; 689 690 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported)) 691 return -EINVAL; 692 693 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) { 694 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap && 695 !wiphy->pmsr_capa->ftm.non_asap)) 696 return -EINVAL; 697 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles || 698 !wiphy->pmsr_capa->ftm.bandwidths)) 699 return -EINVAL; 700 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles & 701 ~(BIT(NL80211_PREAMBLE_LEGACY) | 702 BIT(NL80211_PREAMBLE_HT) | 703 BIT(NL80211_PREAMBLE_VHT) | 704 BIT(NL80211_PREAMBLE_HE) | 705 BIT(NL80211_PREAMBLE_DMG)))) 706 return -EINVAL; 707 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based || 708 wiphy->pmsr_capa->ftm.non_trigger_based) && 709 !(wiphy->pmsr_capa->ftm.preambles & 710 BIT(NL80211_PREAMBLE_HE)))) 711 return -EINVAL; 712 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths & 713 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) | 714 BIT(NL80211_CHAN_WIDTH_20) | 715 BIT(NL80211_CHAN_WIDTH_40) | 716 BIT(NL80211_CHAN_WIDTH_80) | 717 BIT(NL80211_CHAN_WIDTH_80P80) | 718 BIT(NL80211_CHAN_WIDTH_160) | 719 BIT(NL80211_CHAN_WIDTH_5) | 720 BIT(NL80211_CHAN_WIDTH_10)))) 721 return -EINVAL; 722 } 723 724 /* 725 * if a wiphy has unsupported modes for regulatory channel enforcement, 726 * opt-out of enforcement checking 727 */ 728 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) | 729 BIT(NL80211_IFTYPE_P2P_CLIENT) | 730 BIT(NL80211_IFTYPE_AP) | 731 BIT(NL80211_IFTYPE_MESH_POINT) | 732 BIT(NL80211_IFTYPE_P2P_GO) | 733 BIT(NL80211_IFTYPE_ADHOC) | 734 BIT(NL80211_IFTYPE_P2P_DEVICE) | 735 BIT(NL80211_IFTYPE_NAN) | 736 BIT(NL80211_IFTYPE_AP_VLAN) | 737 BIT(NL80211_IFTYPE_MONITOR))) 738 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF; 739 740 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 741 (wiphy->regulatory_flags & 742 (REGULATORY_CUSTOM_REG | 743 REGULATORY_STRICT_REG | 744 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 745 REGULATORY_COUNTRY_IE_IGNORE)))) 746 return -EINVAL; 747 748 if (WARN_ON(wiphy->coalesce && 749 (!wiphy->coalesce->n_rules || 750 !wiphy->coalesce->n_patterns) && 751 (!wiphy->coalesce->pattern_min_len || 752 wiphy->coalesce->pattern_min_len > 753 wiphy->coalesce->pattern_max_len))) 754 return -EINVAL; 755 756 if (WARN_ON(wiphy->ap_sme_capa && 757 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 758 return -EINVAL; 759 760 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 761 return -EINVAL; 762 763 if (WARN_ON(wiphy->addresses && 764 !is_zero_ether_addr(wiphy->perm_addr) && 765 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 766 ETH_ALEN))) 767 return -EINVAL; 768 769 if (WARN_ON(wiphy->max_acl_mac_addrs && 770 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 771 !rdev->ops->set_mac_acl))) 772 return -EINVAL; 773 774 /* assure only valid behaviours are flagged by driver 775 * hence subtract 2 as bit 0 is invalid. 776 */ 777 if (WARN_ON(wiphy->bss_select_support && 778 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 779 return -EINVAL; 780 781 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy, 782 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) && 783 (!rdev->ops->set_pmk || !rdev->ops->del_pmk))) 784 return -EINVAL; 785 786 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) && 787 rdev->ops->update_connect_params)) 788 return -EINVAL; 789 790 if (wiphy->addresses) 791 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 792 793 /* sanity check ifmodes */ 794 WARN_ON(!ifmodes); 795 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 796 if (WARN_ON(ifmodes != wiphy->interface_modes)) 797 wiphy->interface_modes = ifmodes; 798 799 res = wiphy_verify_combinations(wiphy); 800 if (res) 801 return res; 802 803 /* sanity check supported bands/channels */ 804 for (band = 0; band < NUM_NL80211_BANDS; band++) { 805 u16 types = 0; 806 bool have_he = false; 807 808 sband = wiphy->bands[band]; 809 if (!sband) 810 continue; 811 812 sband->band = band; 813 if (WARN_ON(!sband->n_channels)) 814 return -EINVAL; 815 /* 816 * on 60GHz or sub-1Ghz band, there are no legacy rates, so 817 * n_bitrates is 0 818 */ 819 if (WARN_ON((band != NL80211_BAND_60GHZ && 820 band != NL80211_BAND_S1GHZ) && 821 !sband->n_bitrates)) 822 return -EINVAL; 823 824 if (WARN_ON(band == NL80211_BAND_6GHZ && 825 (sband->ht_cap.ht_supported || 826 sband->vht_cap.vht_supported))) 827 return -EINVAL; 828 829 /* 830 * Since cfg80211_disable_40mhz_24ghz is global, we can 831 * modify the sband's ht data even if the driver uses a 832 * global structure for that. 833 */ 834 if (cfg80211_disable_40mhz_24ghz && 835 band == NL80211_BAND_2GHZ && 836 sband->ht_cap.ht_supported) { 837 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 838 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 839 } 840 841 /* 842 * Since we use a u32 for rate bitmaps in 843 * ieee80211_get_response_rate, we cannot 844 * have more than 32 legacy rates. 845 */ 846 if (WARN_ON(sband->n_bitrates > 32)) 847 return -EINVAL; 848 849 for (i = 0; i < sband->n_channels; i++) { 850 sband->channels[i].orig_flags = 851 sband->channels[i].flags; 852 sband->channels[i].orig_mag = INT_MAX; 853 sband->channels[i].orig_mpwr = 854 sband->channels[i].max_power; 855 sband->channels[i].band = band; 856 857 if (WARN_ON(sband->channels[i].freq_offset >= 1000)) 858 return -EINVAL; 859 } 860 861 for (i = 0; i < sband->n_iftype_data; i++) { 862 const struct ieee80211_sband_iftype_data *iftd; 863 864 iftd = &sband->iftype_data[i]; 865 866 if (WARN_ON(!iftd->types_mask)) 867 return -EINVAL; 868 if (WARN_ON(types & iftd->types_mask)) 869 return -EINVAL; 870 871 /* at least one piece of information must be present */ 872 if (WARN_ON(!iftd->he_cap.has_he)) 873 return -EINVAL; 874 875 types |= iftd->types_mask; 876 877 if (i == 0) 878 have_he = iftd->he_cap.has_he; 879 else 880 have_he = have_he && 881 iftd->he_cap.has_he; 882 } 883 884 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ)) 885 return -EINVAL; 886 887 have_band = true; 888 } 889 890 if (!have_band) { 891 WARN_ON(1); 892 return -EINVAL; 893 } 894 895 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) { 896 /* 897 * Validate we have a policy (can be explicitly set to 898 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that 899 * we have at least one of doit/dumpit. 900 */ 901 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy)) 902 return -EINVAL; 903 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit && 904 !rdev->wiphy.vendor_commands[i].dumpit)) 905 return -EINVAL; 906 } 907 908 #ifdef CONFIG_PM 909 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 910 (!rdev->wiphy.wowlan->pattern_min_len || 911 rdev->wiphy.wowlan->pattern_min_len > 912 rdev->wiphy.wowlan->pattern_max_len))) 913 return -EINVAL; 914 #endif 915 916 /* check and set up bitrates */ 917 ieee80211_set_bitrate_flags(wiphy); 918 919 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 920 921 rtnl_lock(); 922 res = device_add(&rdev->wiphy.dev); 923 if (res) { 924 rtnl_unlock(); 925 return res; 926 } 927 928 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 929 cfg80211_rdev_list_generation++; 930 931 /* add to debugfs */ 932 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy), 933 ieee80211_debugfs_dir); 934 935 cfg80211_debugfs_rdev_add(rdev); 936 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 937 938 /* set up regulatory info */ 939 wiphy_regulatory_register(wiphy); 940 941 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 942 struct regulatory_request request; 943 944 request.wiphy_idx = get_wiphy_idx(wiphy); 945 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 946 request.alpha2[0] = '9'; 947 request.alpha2[1] = '9'; 948 949 nl80211_send_reg_change_event(&request); 950 } 951 952 /* Check that nobody globally advertises any capabilities they do not 953 * advertise on all possible interface types. 954 */ 955 if (wiphy->extended_capabilities_len && 956 wiphy->num_iftype_ext_capab && 957 wiphy->iftype_ext_capab) { 958 u8 supported_on_all, j; 959 const struct wiphy_iftype_ext_capab *capab; 960 961 capab = wiphy->iftype_ext_capab; 962 for (j = 0; j < wiphy->extended_capabilities_len; j++) { 963 if (capab[0].extended_capabilities_len > j) 964 supported_on_all = 965 capab[0].extended_capabilities[j]; 966 else 967 supported_on_all = 0x00; 968 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) { 969 if (j >= capab[i].extended_capabilities_len) { 970 supported_on_all = 0x00; 971 break; 972 } 973 supported_on_all &= 974 capab[i].extended_capabilities[j]; 975 } 976 if (WARN_ON(wiphy->extended_capabilities[j] & 977 ~supported_on_all)) 978 break; 979 } 980 } 981 982 rdev->wiphy.registered = true; 983 rtnl_unlock(); 984 985 res = rfkill_register(rdev->wiphy.rfkill); 986 if (res) { 987 rfkill_destroy(rdev->wiphy.rfkill); 988 rdev->wiphy.rfkill = NULL; 989 wiphy_unregister(&rdev->wiphy); 990 return res; 991 } 992 993 return 0; 994 } 995 EXPORT_SYMBOL(wiphy_register); 996 997 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 998 { 999 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1000 1001 if (!rdev->ops->rfkill_poll) 1002 return; 1003 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 1004 rfkill_resume_polling(wiphy->rfkill); 1005 } 1006 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 1007 1008 void wiphy_unregister(struct wiphy *wiphy) 1009 { 1010 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1011 1012 wait_event(rdev->dev_wait, ({ 1013 int __count; 1014 wiphy_lock(&rdev->wiphy); 1015 __count = rdev->opencount; 1016 wiphy_unlock(&rdev->wiphy); 1017 __count == 0; })); 1018 1019 if (rdev->wiphy.rfkill) 1020 rfkill_unregister(rdev->wiphy.rfkill); 1021 1022 rtnl_lock(); 1023 wiphy_lock(&rdev->wiphy); 1024 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 1025 rdev->wiphy.registered = false; 1026 1027 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 1028 1029 /* 1030 * First remove the hardware from everywhere, this makes 1031 * it impossible to find from userspace. 1032 */ 1033 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 1034 list_del_rcu(&rdev->list); 1035 synchronize_rcu(); 1036 1037 /* 1038 * If this device got a regulatory hint tell core its 1039 * free to listen now to a new shiny device regulatory hint 1040 */ 1041 wiphy_regulatory_deregister(wiphy); 1042 1043 cfg80211_rdev_list_generation++; 1044 device_del(&rdev->wiphy.dev); 1045 1046 wiphy_unlock(&rdev->wiphy); 1047 rtnl_unlock(); 1048 1049 flush_work(&rdev->scan_done_wk); 1050 cancel_work_sync(&rdev->conn_work); 1051 flush_work(&rdev->event_work); 1052 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 1053 cancel_delayed_work_sync(&rdev->background_cac_done_wk); 1054 flush_work(&rdev->destroy_work); 1055 flush_work(&rdev->sched_scan_stop_wk); 1056 flush_work(&rdev->propagate_radar_detect_wk); 1057 flush_work(&rdev->propagate_cac_done_wk); 1058 flush_work(&rdev->mgmt_registrations_update_wk); 1059 flush_work(&rdev->background_cac_abort_wk); 1060 1061 #ifdef CONFIG_PM 1062 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 1063 rdev_set_wakeup(rdev, false); 1064 #endif 1065 cfg80211_rdev_free_wowlan(rdev); 1066 cfg80211_rdev_free_coalesce(rdev); 1067 } 1068 EXPORT_SYMBOL(wiphy_unregister); 1069 1070 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 1071 { 1072 struct cfg80211_internal_bss *scan, *tmp; 1073 struct cfg80211_beacon_registration *reg, *treg; 1074 rfkill_destroy(rdev->wiphy.rfkill); 1075 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 1076 list_del(®->list); 1077 kfree(reg); 1078 } 1079 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 1080 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 1081 mutex_destroy(&rdev->wiphy.mtx); 1082 1083 /* 1084 * The 'regd' can only be non-NULL if we never finished 1085 * initializing the wiphy and thus never went through the 1086 * unregister path - e.g. in failure scenarios. Thus, it 1087 * cannot have been visible to anyone if non-NULL, so we 1088 * can just free it here. 1089 */ 1090 kfree(rcu_dereference_raw(rdev->wiphy.regd)); 1091 1092 kfree(rdev); 1093 } 1094 1095 void wiphy_free(struct wiphy *wiphy) 1096 { 1097 put_device(&wiphy->dev); 1098 } 1099 EXPORT_SYMBOL(wiphy_free); 1100 1101 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked, 1102 enum rfkill_hard_block_reasons reason) 1103 { 1104 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1105 1106 if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason)) 1107 schedule_work(&rdev->rfkill_block); 1108 } 1109 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason); 1110 1111 void cfg80211_cqm_config_free(struct wireless_dev *wdev) 1112 { 1113 kfree(wdev->cqm_config); 1114 wdev->cqm_config = NULL; 1115 } 1116 1117 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev, 1118 bool unregister_netdev) 1119 { 1120 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1121 1122 ASSERT_RTNL(); 1123 lockdep_assert_held(&rdev->wiphy.mtx); 1124 1125 flush_work(&wdev->pmsr_free_wk); 1126 1127 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 1128 1129 wdev->registered = false; 1130 1131 if (wdev->netdev) { 1132 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211"); 1133 if (unregister_netdev) 1134 unregister_netdevice(wdev->netdev); 1135 } 1136 1137 list_del_rcu(&wdev->list); 1138 synchronize_net(); 1139 rdev->devlist_generation++; 1140 1141 cfg80211_mlme_purge_registrations(wdev); 1142 1143 switch (wdev->iftype) { 1144 case NL80211_IFTYPE_P2P_DEVICE: 1145 cfg80211_stop_p2p_device(rdev, wdev); 1146 break; 1147 case NL80211_IFTYPE_NAN: 1148 cfg80211_stop_nan(rdev, wdev); 1149 break; 1150 default: 1151 break; 1152 } 1153 1154 #ifdef CONFIG_CFG80211_WEXT 1155 kfree_sensitive(wdev->wext.keys); 1156 wdev->wext.keys = NULL; 1157 #endif 1158 /* only initialized if we have a netdev */ 1159 if (wdev->netdev) 1160 flush_work(&wdev->disconnect_wk); 1161 1162 cfg80211_cqm_config_free(wdev); 1163 1164 /* 1165 * Ensure that all events have been processed and 1166 * freed. 1167 */ 1168 cfg80211_process_wdev_events(wdev); 1169 1170 if (WARN_ON(wdev->current_bss)) { 1171 cfg80211_unhold_bss(wdev->current_bss); 1172 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 1173 wdev->current_bss = NULL; 1174 } 1175 } 1176 1177 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 1178 { 1179 _cfg80211_unregister_wdev(wdev, true); 1180 } 1181 EXPORT_SYMBOL(cfg80211_unregister_wdev); 1182 1183 static const struct device_type wiphy_type = { 1184 .name = "wlan", 1185 }; 1186 1187 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 1188 enum nl80211_iftype iftype, int num) 1189 { 1190 lockdep_assert_held(&rdev->wiphy.mtx); 1191 1192 rdev->num_running_ifaces += num; 1193 if (iftype == NL80211_IFTYPE_MONITOR) 1194 rdev->num_running_monitor_ifaces += num; 1195 } 1196 1197 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 1198 struct wireless_dev *wdev) 1199 { 1200 struct net_device *dev = wdev->netdev; 1201 struct cfg80211_sched_scan_request *pos, *tmp; 1202 1203 lockdep_assert_held(&rdev->wiphy.mtx); 1204 ASSERT_WDEV_LOCK(wdev); 1205 1206 cfg80211_pmsr_wdev_down(wdev); 1207 1208 cfg80211_stop_background_radar_detection(wdev); 1209 1210 switch (wdev->iftype) { 1211 case NL80211_IFTYPE_ADHOC: 1212 __cfg80211_leave_ibss(rdev, dev, true); 1213 break; 1214 case NL80211_IFTYPE_P2P_CLIENT: 1215 case NL80211_IFTYPE_STATION: 1216 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, 1217 list) { 1218 if (dev == pos->dev) 1219 cfg80211_stop_sched_scan_req(rdev, pos, false); 1220 } 1221 1222 #ifdef CONFIG_CFG80211_WEXT 1223 kfree(wdev->wext.ie); 1224 wdev->wext.ie = NULL; 1225 wdev->wext.ie_len = 0; 1226 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1227 #endif 1228 cfg80211_disconnect(rdev, dev, 1229 WLAN_REASON_DEAUTH_LEAVING, true); 1230 break; 1231 case NL80211_IFTYPE_MESH_POINT: 1232 __cfg80211_leave_mesh(rdev, dev); 1233 break; 1234 case NL80211_IFTYPE_AP: 1235 case NL80211_IFTYPE_P2P_GO: 1236 __cfg80211_stop_ap(rdev, dev, true); 1237 break; 1238 case NL80211_IFTYPE_OCB: 1239 __cfg80211_leave_ocb(rdev, dev); 1240 break; 1241 case NL80211_IFTYPE_P2P_DEVICE: 1242 case NL80211_IFTYPE_NAN: 1243 /* cannot happen, has no netdev */ 1244 break; 1245 case NL80211_IFTYPE_AP_VLAN: 1246 case NL80211_IFTYPE_MONITOR: 1247 /* nothing to do */ 1248 break; 1249 case NL80211_IFTYPE_UNSPECIFIED: 1250 case NL80211_IFTYPE_WDS: 1251 case NUM_NL80211_IFTYPES: 1252 /* invalid */ 1253 break; 1254 } 1255 } 1256 1257 void cfg80211_leave(struct cfg80211_registered_device *rdev, 1258 struct wireless_dev *wdev) 1259 { 1260 wdev_lock(wdev); 1261 __cfg80211_leave(rdev, wdev); 1262 wdev_unlock(wdev); 1263 } 1264 1265 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 1266 gfp_t gfp) 1267 { 1268 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1269 struct cfg80211_event *ev; 1270 unsigned long flags; 1271 1272 trace_cfg80211_stop_iface(wiphy, wdev); 1273 1274 ev = kzalloc(sizeof(*ev), gfp); 1275 if (!ev) 1276 return; 1277 1278 ev->type = EVENT_STOPPED; 1279 1280 spin_lock_irqsave(&wdev->event_lock, flags); 1281 list_add_tail(&ev->list, &wdev->event_list); 1282 spin_unlock_irqrestore(&wdev->event_lock, flags); 1283 queue_work(cfg80211_wq, &rdev->event_work); 1284 } 1285 EXPORT_SYMBOL(cfg80211_stop_iface); 1286 1287 void cfg80211_init_wdev(struct wireless_dev *wdev) 1288 { 1289 mutex_init(&wdev->mtx); 1290 INIT_LIST_HEAD(&wdev->event_list); 1291 spin_lock_init(&wdev->event_lock); 1292 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1293 INIT_LIST_HEAD(&wdev->pmsr_list); 1294 spin_lock_init(&wdev->pmsr_lock); 1295 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk); 1296 1297 #ifdef CONFIG_CFG80211_WEXT 1298 wdev->wext.default_key = -1; 1299 wdev->wext.default_mgmt_key = -1; 1300 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1301 #endif 1302 1303 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1304 wdev->ps = true; 1305 else 1306 wdev->ps = false; 1307 /* allow mac80211 to determine the timeout */ 1308 wdev->ps_timeout = -1; 1309 1310 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1311 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1312 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1313 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE; 1314 1315 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk); 1316 } 1317 1318 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev, 1319 struct wireless_dev *wdev) 1320 { 1321 ASSERT_RTNL(); 1322 lockdep_assert_held(&rdev->wiphy.mtx); 1323 1324 /* 1325 * We get here also when the interface changes network namespaces, 1326 * as it's registered into the new one, but we don't want it to 1327 * change ID in that case. Checking if the ID is already assigned 1328 * works, because 0 isn't considered a valid ID and the memory is 1329 * 0-initialized. 1330 */ 1331 if (!wdev->identifier) 1332 wdev->identifier = ++rdev->wdev_id; 1333 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list); 1334 rdev->devlist_generation++; 1335 wdev->registered = true; 1336 1337 if (wdev->netdev && 1338 sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj, 1339 "phy80211")) 1340 pr_err("failed to add phy80211 symlink to netdev!\n"); 1341 1342 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 1343 } 1344 1345 int cfg80211_register_netdevice(struct net_device *dev) 1346 { 1347 struct wireless_dev *wdev = dev->ieee80211_ptr; 1348 struct cfg80211_registered_device *rdev; 1349 int ret; 1350 1351 ASSERT_RTNL(); 1352 1353 if (WARN_ON(!wdev)) 1354 return -EINVAL; 1355 1356 rdev = wiphy_to_rdev(wdev->wiphy); 1357 1358 lockdep_assert_held(&rdev->wiphy.mtx); 1359 1360 /* we'll take care of this */ 1361 wdev->registered = true; 1362 wdev->registering = true; 1363 ret = register_netdevice(dev); 1364 if (ret) 1365 goto out; 1366 1367 cfg80211_register_wdev(rdev, wdev); 1368 ret = 0; 1369 out: 1370 wdev->registering = false; 1371 if (ret) 1372 wdev->registered = false; 1373 return ret; 1374 } 1375 EXPORT_SYMBOL(cfg80211_register_netdevice); 1376 1377 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 1378 unsigned long state, void *ptr) 1379 { 1380 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1381 struct wireless_dev *wdev = dev->ieee80211_ptr; 1382 struct cfg80211_registered_device *rdev; 1383 struct cfg80211_sched_scan_request *pos, *tmp; 1384 1385 if (!wdev) 1386 return NOTIFY_DONE; 1387 1388 rdev = wiphy_to_rdev(wdev->wiphy); 1389 1390 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 1391 1392 switch (state) { 1393 case NETDEV_POST_INIT: 1394 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 1395 wdev->netdev = dev; 1396 /* can only change netns with wiphy */ 1397 dev->features |= NETIF_F_NETNS_LOCAL; 1398 1399 cfg80211_init_wdev(wdev); 1400 break; 1401 case NETDEV_REGISTER: 1402 if (!wdev->registered) { 1403 wiphy_lock(&rdev->wiphy); 1404 cfg80211_register_wdev(rdev, wdev); 1405 wiphy_unlock(&rdev->wiphy); 1406 } 1407 break; 1408 case NETDEV_UNREGISTER: 1409 /* 1410 * It is possible to get NETDEV_UNREGISTER multiple times, 1411 * so check wdev->registered. 1412 */ 1413 if (wdev->registered && !wdev->registering) { 1414 wiphy_lock(&rdev->wiphy); 1415 _cfg80211_unregister_wdev(wdev, false); 1416 wiphy_unlock(&rdev->wiphy); 1417 } 1418 break; 1419 case NETDEV_GOING_DOWN: 1420 wiphy_lock(&rdev->wiphy); 1421 cfg80211_leave(rdev, wdev); 1422 wiphy_unlock(&rdev->wiphy); 1423 break; 1424 case NETDEV_DOWN: 1425 wiphy_lock(&rdev->wiphy); 1426 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1427 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1428 if (WARN_ON(!rdev->scan_req->notified && 1429 (!rdev->int_scan_req || 1430 !rdev->int_scan_req->notified))) 1431 rdev->scan_req->info.aborted = true; 1432 ___cfg80211_scan_done(rdev, false); 1433 } 1434 1435 list_for_each_entry_safe(pos, tmp, 1436 &rdev->sched_scan_req_list, list) { 1437 if (WARN_ON(pos->dev == wdev->netdev)) 1438 cfg80211_stop_sched_scan_req(rdev, pos, false); 1439 } 1440 1441 rdev->opencount--; 1442 wiphy_unlock(&rdev->wiphy); 1443 wake_up(&rdev->dev_wait); 1444 break; 1445 case NETDEV_UP: 1446 wiphy_lock(&rdev->wiphy); 1447 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1448 wdev_lock(wdev); 1449 switch (wdev->iftype) { 1450 #ifdef CONFIG_CFG80211_WEXT 1451 case NL80211_IFTYPE_ADHOC: 1452 cfg80211_ibss_wext_join(rdev, wdev); 1453 break; 1454 case NL80211_IFTYPE_STATION: 1455 cfg80211_mgd_wext_connect(rdev, wdev); 1456 break; 1457 #endif 1458 #ifdef CONFIG_MAC80211_MESH 1459 case NL80211_IFTYPE_MESH_POINT: 1460 { 1461 /* backward compat code... */ 1462 struct mesh_setup setup; 1463 memcpy(&setup, &default_mesh_setup, 1464 sizeof(setup)); 1465 /* back compat only needed for mesh_id */ 1466 setup.mesh_id = wdev->ssid; 1467 setup.mesh_id_len = wdev->mesh_id_up_len; 1468 if (wdev->mesh_id_up_len) 1469 __cfg80211_join_mesh(rdev, dev, 1470 &setup, 1471 &default_mesh_config); 1472 break; 1473 } 1474 #endif 1475 default: 1476 break; 1477 } 1478 wdev_unlock(wdev); 1479 rdev->opencount++; 1480 1481 /* 1482 * Configure power management to the driver here so that its 1483 * correctly set also after interface type changes etc. 1484 */ 1485 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1486 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1487 rdev->ops->set_power_mgmt && 1488 rdev_set_power_mgmt(rdev, dev, wdev->ps, 1489 wdev->ps_timeout)) { 1490 /* assume this means it's off */ 1491 wdev->ps = false; 1492 } 1493 wiphy_unlock(&rdev->wiphy); 1494 break; 1495 case NETDEV_PRE_UP: 1496 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype, 1497 wdev->use_4addr, 0)) 1498 return notifier_from_errno(-EOPNOTSUPP); 1499 1500 if (rfkill_blocked(rdev->wiphy.rfkill)) 1501 return notifier_from_errno(-ERFKILL); 1502 break; 1503 default: 1504 return NOTIFY_DONE; 1505 } 1506 1507 wireless_nlevent_flush(); 1508 1509 return NOTIFY_OK; 1510 } 1511 1512 static struct notifier_block cfg80211_netdev_notifier = { 1513 .notifier_call = cfg80211_netdev_notifier_call, 1514 }; 1515 1516 static void __net_exit cfg80211_pernet_exit(struct net *net) 1517 { 1518 struct cfg80211_registered_device *rdev; 1519 1520 rtnl_lock(); 1521 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1522 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1523 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1524 } 1525 rtnl_unlock(); 1526 } 1527 1528 static struct pernet_operations cfg80211_pernet_ops = { 1529 .exit = cfg80211_pernet_exit, 1530 }; 1531 1532 static int __init cfg80211_init(void) 1533 { 1534 int err; 1535 1536 err = register_pernet_device(&cfg80211_pernet_ops); 1537 if (err) 1538 goto out_fail_pernet; 1539 1540 err = wiphy_sysfs_init(); 1541 if (err) 1542 goto out_fail_sysfs; 1543 1544 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1545 if (err) 1546 goto out_fail_notifier; 1547 1548 err = nl80211_init(); 1549 if (err) 1550 goto out_fail_nl80211; 1551 1552 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1553 1554 err = regulatory_init(); 1555 if (err) 1556 goto out_fail_reg; 1557 1558 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM); 1559 if (!cfg80211_wq) { 1560 err = -ENOMEM; 1561 goto out_fail_wq; 1562 } 1563 1564 return 0; 1565 1566 out_fail_wq: 1567 regulatory_exit(); 1568 out_fail_reg: 1569 debugfs_remove(ieee80211_debugfs_dir); 1570 nl80211_exit(); 1571 out_fail_nl80211: 1572 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1573 out_fail_notifier: 1574 wiphy_sysfs_exit(); 1575 out_fail_sysfs: 1576 unregister_pernet_device(&cfg80211_pernet_ops); 1577 out_fail_pernet: 1578 return err; 1579 } 1580 fs_initcall(cfg80211_init); 1581 1582 static void __exit cfg80211_exit(void) 1583 { 1584 debugfs_remove(ieee80211_debugfs_dir); 1585 nl80211_exit(); 1586 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1587 wiphy_sysfs_exit(); 1588 regulatory_exit(); 1589 unregister_pernet_device(&cfg80211_pernet_ops); 1590 destroy_workqueue(cfg80211_wq); 1591 } 1592 module_exit(cfg80211_exit); 1593