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; 335 336 ASSERT_RTNL(); 337 338 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) { 339 if (wdev->nl_owner_dead) 340 rdev_del_virtual_intf(rdev, wdev); 341 } 342 } 343 344 static void cfg80211_destroy_iface_wk(struct work_struct *work) 345 { 346 struct cfg80211_registered_device *rdev; 347 348 rdev = container_of(work, struct cfg80211_registered_device, 349 destroy_work); 350 351 rtnl_lock(); 352 cfg80211_destroy_ifaces(rdev); 353 rtnl_unlock(); 354 } 355 356 static void cfg80211_sched_scan_stop_wk(struct work_struct *work) 357 { 358 struct cfg80211_registered_device *rdev; 359 struct cfg80211_sched_scan_request *req, *tmp; 360 361 rdev = container_of(work, struct cfg80211_registered_device, 362 sched_scan_stop_wk); 363 364 rtnl_lock(); 365 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { 366 if (req->nl_owner_dead) 367 cfg80211_stop_sched_scan_req(rdev, req, false); 368 } 369 rtnl_unlock(); 370 } 371 372 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work) 373 { 374 struct cfg80211_registered_device *rdev; 375 376 rdev = container_of(work, struct cfg80211_registered_device, 377 propagate_radar_detect_wk); 378 379 rtnl_lock(); 380 381 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef, 382 NL80211_DFS_UNAVAILABLE, 383 NL80211_RADAR_DETECTED); 384 385 rtnl_unlock(); 386 } 387 388 static void cfg80211_propagate_cac_done_wk(struct work_struct *work) 389 { 390 struct cfg80211_registered_device *rdev; 391 392 rdev = container_of(work, struct cfg80211_registered_device, 393 propagate_cac_done_wk); 394 395 rtnl_lock(); 396 397 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef, 398 NL80211_DFS_AVAILABLE, 399 NL80211_RADAR_CAC_FINISHED); 400 401 rtnl_unlock(); 402 } 403 404 /* exported functions */ 405 406 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, 407 const char *requested_name) 408 { 409 static atomic_t wiphy_counter = ATOMIC_INIT(0); 410 411 struct cfg80211_registered_device *rdev; 412 int alloc_size; 413 414 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 415 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 416 WARN_ON(ops->connect && !ops->disconnect); 417 WARN_ON(ops->join_ibss && !ops->leave_ibss); 418 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 419 WARN_ON(ops->add_station && !ops->del_station); 420 WARN_ON(ops->add_mpath && !ops->del_mpath); 421 WARN_ON(ops->join_mesh && !ops->leave_mesh); 422 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device); 423 WARN_ON(ops->start_ap && !ops->stop_ap); 424 WARN_ON(ops->join_ocb && !ops->leave_ocb); 425 WARN_ON(ops->suspend && !ops->resume); 426 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop); 427 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel); 428 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch); 429 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts); 430 431 alloc_size = sizeof(*rdev) + sizeof_priv; 432 433 rdev = kzalloc(alloc_size, GFP_KERNEL); 434 if (!rdev) 435 return NULL; 436 437 rdev->ops = ops; 438 439 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 440 441 if (unlikely(rdev->wiphy_idx < 0)) { 442 /* ugh, wrapped! */ 443 atomic_dec(&wiphy_counter); 444 kfree(rdev); 445 return NULL; 446 } 447 448 /* atomic_inc_return makes it start at 1, make it start at 0 */ 449 rdev->wiphy_idx--; 450 451 /* give it a proper name */ 452 if (requested_name && requested_name[0]) { 453 int rv; 454 455 rtnl_lock(); 456 rv = cfg80211_dev_check_name(rdev, requested_name); 457 458 if (rv < 0) { 459 rtnl_unlock(); 460 goto use_default_name; 461 } 462 463 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); 464 rtnl_unlock(); 465 if (rv) 466 goto use_default_name; 467 } else { 468 int rv; 469 470 use_default_name: 471 /* NOTE: This is *probably* safe w/out holding rtnl because of 472 * the restrictions on phy names. Probably this call could 473 * fail if some other part of the kernel (re)named a device 474 * phyX. But, might should add some locking and check return 475 * value, and use a different name if this one exists? 476 */ 477 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 478 if (rv < 0) { 479 kfree(rdev); 480 return NULL; 481 } 482 } 483 484 mutex_init(&rdev->wiphy.mtx); 485 INIT_LIST_HEAD(&rdev->wiphy.wdev_list); 486 INIT_LIST_HEAD(&rdev->beacon_registrations); 487 spin_lock_init(&rdev->beacon_registrations_lock); 488 spin_lock_init(&rdev->bss_lock); 489 INIT_LIST_HEAD(&rdev->bss_list); 490 INIT_LIST_HEAD(&rdev->sched_scan_req_list); 491 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 492 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 493 cfg80211_dfs_channels_update_work); 494 #ifdef CONFIG_CFG80211_WEXT 495 rdev->wiphy.wext = &cfg80211_wext_handler; 496 #endif 497 498 device_initialize(&rdev->wiphy.dev); 499 rdev->wiphy.dev.class = &ieee80211_class; 500 rdev->wiphy.dev.platform_data = rdev; 501 device_enable_async_suspend(&rdev->wiphy.dev); 502 503 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 504 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 505 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk); 506 INIT_WORK(&rdev->propagate_radar_detect_wk, 507 cfg80211_propagate_radar_detect_wk); 508 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk); 509 INIT_WORK(&rdev->mgmt_registrations_update_wk, 510 cfg80211_mgmt_registrations_update_wk); 511 512 #ifdef CONFIG_CFG80211_DEFAULT_PS 513 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 514 #endif 515 516 wiphy_net_set(&rdev->wiphy, &init_net); 517 518 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 519 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 520 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 521 &rdev->rfkill_ops, rdev); 522 523 if (!rdev->rfkill) { 524 wiphy_free(&rdev->wiphy); 525 return NULL; 526 } 527 528 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work); 529 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 530 INIT_WORK(&rdev->event_work, cfg80211_event_work); 531 532 init_waitqueue_head(&rdev->dev_wait); 533 534 /* 535 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 536 * Fragmentation and RTS threshold are disabled by default with the 537 * special -1 value. 538 */ 539 rdev->wiphy.retry_short = 7; 540 rdev->wiphy.retry_long = 4; 541 rdev->wiphy.frag_threshold = (u32) -1; 542 rdev->wiphy.rts_threshold = (u32) -1; 543 rdev->wiphy.coverage_class = 0; 544 545 rdev->wiphy.max_num_csa_counters = 1; 546 547 rdev->wiphy.max_sched_scan_plans = 1; 548 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 549 550 return &rdev->wiphy; 551 } 552 EXPORT_SYMBOL(wiphy_new_nm); 553 554 static int wiphy_verify_combinations(struct wiphy *wiphy) 555 { 556 const struct ieee80211_iface_combination *c; 557 int i, j; 558 559 for (i = 0; i < wiphy->n_iface_combinations; i++) { 560 u32 cnt = 0; 561 u16 all_iftypes = 0; 562 563 c = &wiphy->iface_combinations[i]; 564 565 /* 566 * Combinations with just one interface aren't real, 567 * however we make an exception for DFS. 568 */ 569 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 570 return -EINVAL; 571 572 /* Need at least one channel */ 573 if (WARN_ON(!c->num_different_channels)) 574 return -EINVAL; 575 576 /* 577 * Put a sane limit on maximum number of different 578 * channels to simplify channel accounting code. 579 */ 580 if (WARN_ON(c->num_different_channels > 581 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 582 return -EINVAL; 583 584 /* DFS only works on one channel. */ 585 if (WARN_ON(c->radar_detect_widths && 586 (c->num_different_channels > 1))) 587 return -EINVAL; 588 589 if (WARN_ON(!c->n_limits)) 590 return -EINVAL; 591 592 for (j = 0; j < c->n_limits; j++) { 593 u16 types = c->limits[j].types; 594 595 /* interface types shouldn't overlap */ 596 if (WARN_ON(types & all_iftypes)) 597 return -EINVAL; 598 all_iftypes |= types; 599 600 if (WARN_ON(!c->limits[j].max)) 601 return -EINVAL; 602 603 /* Shouldn't list software iftypes in combinations! */ 604 if (WARN_ON(wiphy->software_iftypes & types)) 605 return -EINVAL; 606 607 /* Only a single P2P_DEVICE can be allowed */ 608 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 609 c->limits[j].max > 1)) 610 return -EINVAL; 611 612 /* Only a single NAN can be allowed */ 613 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) && 614 c->limits[j].max > 1)) 615 return -EINVAL; 616 617 /* 618 * This isn't well-defined right now. If you have an 619 * IBSS interface, then its beacon interval may change 620 * by joining other networks, and nothing prevents it 621 * from doing that. 622 * So technically we probably shouldn't even allow AP 623 * and IBSS in the same interface, but it seems that 624 * some drivers support that, possibly only with fixed 625 * beacon intervals for IBSS. 626 */ 627 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) && 628 c->beacon_int_min_gcd)) { 629 return -EINVAL; 630 } 631 632 cnt += c->limits[j].max; 633 /* 634 * Don't advertise an unsupported type 635 * in a combination. 636 */ 637 if (WARN_ON((wiphy->interface_modes & types) != types)) 638 return -EINVAL; 639 } 640 641 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS))) 642 return -EINVAL; 643 644 /* You can't even choose that many! */ 645 if (WARN_ON(cnt < c->max_interfaces)) 646 return -EINVAL; 647 } 648 649 return 0; 650 } 651 652 int wiphy_register(struct wiphy *wiphy) 653 { 654 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 655 int res; 656 enum nl80211_band band; 657 struct ieee80211_supported_band *sband; 658 bool have_band = false; 659 int i; 660 u16 ifmodes = wiphy->interface_modes; 661 662 #ifdef CONFIG_PM 663 if (WARN_ON(wiphy->wowlan && 664 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 665 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 666 return -EINVAL; 667 if (WARN_ON(wiphy->wowlan && 668 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 669 !wiphy->wowlan->tcp)) 670 return -EINVAL; 671 #endif 672 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 673 (!rdev->ops->tdls_channel_switch || 674 !rdev->ops->tdls_cancel_channel_switch))) 675 return -EINVAL; 676 677 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) && 678 (!rdev->ops->start_nan || !rdev->ops->stop_nan || 679 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func || 680 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ))))) 681 return -EINVAL; 682 683 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))) 684 return -EINVAL; 685 686 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported)) 687 return -EINVAL; 688 689 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) { 690 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap && 691 !wiphy->pmsr_capa->ftm.non_asap)) 692 return -EINVAL; 693 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles || 694 !wiphy->pmsr_capa->ftm.bandwidths)) 695 return -EINVAL; 696 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles & 697 ~(BIT(NL80211_PREAMBLE_LEGACY) | 698 BIT(NL80211_PREAMBLE_HT) | 699 BIT(NL80211_PREAMBLE_VHT) | 700 BIT(NL80211_PREAMBLE_HE) | 701 BIT(NL80211_PREAMBLE_DMG)))) 702 return -EINVAL; 703 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based || 704 wiphy->pmsr_capa->ftm.non_trigger_based) && 705 !(wiphy->pmsr_capa->ftm.preambles & 706 BIT(NL80211_PREAMBLE_HE)))) 707 return -EINVAL; 708 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths & 709 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) | 710 BIT(NL80211_CHAN_WIDTH_20) | 711 BIT(NL80211_CHAN_WIDTH_40) | 712 BIT(NL80211_CHAN_WIDTH_80) | 713 BIT(NL80211_CHAN_WIDTH_80P80) | 714 BIT(NL80211_CHAN_WIDTH_160) | 715 BIT(NL80211_CHAN_WIDTH_5) | 716 BIT(NL80211_CHAN_WIDTH_10)))) 717 return -EINVAL; 718 } 719 720 /* 721 * if a wiphy has unsupported modes for regulatory channel enforcement, 722 * opt-out of enforcement checking 723 */ 724 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) | 725 BIT(NL80211_IFTYPE_P2P_CLIENT) | 726 BIT(NL80211_IFTYPE_AP) | 727 BIT(NL80211_IFTYPE_P2P_GO) | 728 BIT(NL80211_IFTYPE_ADHOC) | 729 BIT(NL80211_IFTYPE_P2P_DEVICE) | 730 BIT(NL80211_IFTYPE_NAN) | 731 BIT(NL80211_IFTYPE_AP_VLAN) | 732 BIT(NL80211_IFTYPE_MONITOR))) 733 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF; 734 735 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 736 (wiphy->regulatory_flags & 737 (REGULATORY_CUSTOM_REG | 738 REGULATORY_STRICT_REG | 739 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 740 REGULATORY_COUNTRY_IE_IGNORE)))) 741 return -EINVAL; 742 743 if (WARN_ON(wiphy->coalesce && 744 (!wiphy->coalesce->n_rules || 745 !wiphy->coalesce->n_patterns) && 746 (!wiphy->coalesce->pattern_min_len || 747 wiphy->coalesce->pattern_min_len > 748 wiphy->coalesce->pattern_max_len))) 749 return -EINVAL; 750 751 if (WARN_ON(wiphy->ap_sme_capa && 752 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 753 return -EINVAL; 754 755 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 756 return -EINVAL; 757 758 if (WARN_ON(wiphy->addresses && 759 !is_zero_ether_addr(wiphy->perm_addr) && 760 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 761 ETH_ALEN))) 762 return -EINVAL; 763 764 if (WARN_ON(wiphy->max_acl_mac_addrs && 765 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 766 !rdev->ops->set_mac_acl))) 767 return -EINVAL; 768 769 /* assure only valid behaviours are flagged by driver 770 * hence subtract 2 as bit 0 is invalid. 771 */ 772 if (WARN_ON(wiphy->bss_select_support && 773 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 774 return -EINVAL; 775 776 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy, 777 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) && 778 (!rdev->ops->set_pmk || !rdev->ops->del_pmk))) 779 return -EINVAL; 780 781 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) && 782 rdev->ops->update_connect_params)) 783 return -EINVAL; 784 785 if (wiphy->addresses) 786 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 787 788 /* sanity check ifmodes */ 789 WARN_ON(!ifmodes); 790 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 791 if (WARN_ON(ifmodes != wiphy->interface_modes)) 792 wiphy->interface_modes = ifmodes; 793 794 res = wiphy_verify_combinations(wiphy); 795 if (res) 796 return res; 797 798 /* sanity check supported bands/channels */ 799 for (band = 0; band < NUM_NL80211_BANDS; band++) { 800 u16 types = 0; 801 bool have_he = false; 802 803 sband = wiphy->bands[band]; 804 if (!sband) 805 continue; 806 807 sband->band = band; 808 if (WARN_ON(!sband->n_channels)) 809 return -EINVAL; 810 /* 811 * on 60GHz or sub-1Ghz band, there are no legacy rates, so 812 * n_bitrates is 0 813 */ 814 if (WARN_ON((band != NL80211_BAND_60GHZ && 815 band != NL80211_BAND_S1GHZ) && 816 !sband->n_bitrates)) 817 return -EINVAL; 818 819 if (WARN_ON(band == NL80211_BAND_6GHZ && 820 (sband->ht_cap.ht_supported || 821 sband->vht_cap.vht_supported))) 822 return -EINVAL; 823 824 /* 825 * Since cfg80211_disable_40mhz_24ghz is global, we can 826 * modify the sband's ht data even if the driver uses a 827 * global structure for that. 828 */ 829 if (cfg80211_disable_40mhz_24ghz && 830 band == NL80211_BAND_2GHZ && 831 sband->ht_cap.ht_supported) { 832 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 833 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 834 } 835 836 /* 837 * Since we use a u32 for rate bitmaps in 838 * ieee80211_get_response_rate, we cannot 839 * have more than 32 legacy rates. 840 */ 841 if (WARN_ON(sband->n_bitrates > 32)) 842 return -EINVAL; 843 844 for (i = 0; i < sband->n_channels; i++) { 845 sband->channels[i].orig_flags = 846 sband->channels[i].flags; 847 sband->channels[i].orig_mag = INT_MAX; 848 sband->channels[i].orig_mpwr = 849 sband->channels[i].max_power; 850 sband->channels[i].band = band; 851 852 if (WARN_ON(sband->channels[i].freq_offset >= 1000)) 853 return -EINVAL; 854 } 855 856 for (i = 0; i < sband->n_iftype_data; i++) { 857 const struct ieee80211_sband_iftype_data *iftd; 858 859 iftd = &sband->iftype_data[i]; 860 861 if (WARN_ON(!iftd->types_mask)) 862 return -EINVAL; 863 if (WARN_ON(types & iftd->types_mask)) 864 return -EINVAL; 865 866 /* at least one piece of information must be present */ 867 if (WARN_ON(!iftd->he_cap.has_he)) 868 return -EINVAL; 869 870 types |= iftd->types_mask; 871 872 if (i == 0) 873 have_he = iftd->he_cap.has_he; 874 else 875 have_he = have_he && 876 iftd->he_cap.has_he; 877 } 878 879 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ)) 880 return -EINVAL; 881 882 have_band = true; 883 } 884 885 if (!have_band) { 886 WARN_ON(1); 887 return -EINVAL; 888 } 889 890 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) { 891 /* 892 * Validate we have a policy (can be explicitly set to 893 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that 894 * we have at least one of doit/dumpit. 895 */ 896 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy)) 897 return -EINVAL; 898 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit && 899 !rdev->wiphy.vendor_commands[i].dumpit)) 900 return -EINVAL; 901 } 902 903 #ifdef CONFIG_PM 904 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 905 (!rdev->wiphy.wowlan->pattern_min_len || 906 rdev->wiphy.wowlan->pattern_min_len > 907 rdev->wiphy.wowlan->pattern_max_len))) 908 return -EINVAL; 909 #endif 910 911 /* check and set up bitrates */ 912 ieee80211_set_bitrate_flags(wiphy); 913 914 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 915 916 rtnl_lock(); 917 res = device_add(&rdev->wiphy.dev); 918 if (res) { 919 rtnl_unlock(); 920 return res; 921 } 922 923 /* set up regulatory info */ 924 wiphy_regulatory_register(wiphy); 925 926 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 927 cfg80211_rdev_list_generation++; 928 929 /* add to debugfs */ 930 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy), 931 ieee80211_debugfs_dir); 932 933 cfg80211_debugfs_rdev_add(rdev); 934 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 935 936 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 937 struct regulatory_request request; 938 939 request.wiphy_idx = get_wiphy_idx(wiphy); 940 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 941 request.alpha2[0] = '9'; 942 request.alpha2[1] = '9'; 943 944 nl80211_send_reg_change_event(&request); 945 } 946 947 /* Check that nobody globally advertises any capabilities they do not 948 * advertise on all possible interface types. 949 */ 950 if (wiphy->extended_capabilities_len && 951 wiphy->num_iftype_ext_capab && 952 wiphy->iftype_ext_capab) { 953 u8 supported_on_all, j; 954 const struct wiphy_iftype_ext_capab *capab; 955 956 capab = wiphy->iftype_ext_capab; 957 for (j = 0; j < wiphy->extended_capabilities_len; j++) { 958 if (capab[0].extended_capabilities_len > j) 959 supported_on_all = 960 capab[0].extended_capabilities[j]; 961 else 962 supported_on_all = 0x00; 963 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) { 964 if (j >= capab[i].extended_capabilities_len) { 965 supported_on_all = 0x00; 966 break; 967 } 968 supported_on_all &= 969 capab[i].extended_capabilities[j]; 970 } 971 if (WARN_ON(wiphy->extended_capabilities[j] & 972 ~supported_on_all)) 973 break; 974 } 975 } 976 977 rdev->wiphy.registered = true; 978 rtnl_unlock(); 979 980 res = rfkill_register(rdev->rfkill); 981 if (res) { 982 rfkill_destroy(rdev->rfkill); 983 rdev->rfkill = NULL; 984 wiphy_unregister(&rdev->wiphy); 985 return res; 986 } 987 988 return 0; 989 } 990 EXPORT_SYMBOL(wiphy_register); 991 992 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 993 { 994 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 995 996 if (!rdev->ops->rfkill_poll) 997 return; 998 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 999 rfkill_resume_polling(rdev->rfkill); 1000 } 1001 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 1002 1003 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 1004 { 1005 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1006 1007 rfkill_pause_polling(rdev->rfkill); 1008 } 1009 EXPORT_SYMBOL(wiphy_rfkill_stop_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->rfkill) 1023 rfkill_unregister(rdev->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->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(struct wiphy *wiphy, bool blocked) 1093 { 1094 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1095 1096 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 1097 schedule_work(&rdev->rfkill_block); 1098 } 1099 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 1100 1101 void cfg80211_cqm_config_free(struct wireless_dev *wdev) 1102 { 1103 kfree(wdev->cqm_config); 1104 wdev->cqm_config = NULL; 1105 } 1106 1107 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev, 1108 bool unregister_netdev) 1109 { 1110 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1111 1112 ASSERT_RTNL(); 1113 lockdep_assert_held(&rdev->wiphy.mtx); 1114 1115 flush_work(&wdev->pmsr_free_wk); 1116 1117 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 1118 1119 wdev->registered = false; 1120 1121 if (wdev->netdev) { 1122 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211"); 1123 if (unregister_netdev) 1124 unregister_netdevice(wdev->netdev); 1125 } 1126 1127 list_del_rcu(&wdev->list); 1128 synchronize_net(); 1129 rdev->devlist_generation++; 1130 1131 cfg80211_mlme_purge_registrations(wdev); 1132 1133 switch (wdev->iftype) { 1134 case NL80211_IFTYPE_P2P_DEVICE: 1135 cfg80211_stop_p2p_device(rdev, wdev); 1136 break; 1137 case NL80211_IFTYPE_NAN: 1138 cfg80211_stop_nan(rdev, wdev); 1139 break; 1140 default: 1141 break; 1142 } 1143 1144 #ifdef CONFIG_CFG80211_WEXT 1145 kfree_sensitive(wdev->wext.keys); 1146 wdev->wext.keys = NULL; 1147 #endif 1148 /* only initialized if we have a netdev */ 1149 if (wdev->netdev) 1150 flush_work(&wdev->disconnect_wk); 1151 1152 cfg80211_cqm_config_free(wdev); 1153 1154 /* 1155 * Ensure that all events have been processed and 1156 * freed. 1157 */ 1158 cfg80211_process_wdev_events(wdev); 1159 1160 if (WARN_ON(wdev->current_bss)) { 1161 cfg80211_unhold_bss(wdev->current_bss); 1162 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 1163 wdev->current_bss = NULL; 1164 } 1165 } 1166 1167 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 1168 { 1169 _cfg80211_unregister_wdev(wdev, true); 1170 } 1171 EXPORT_SYMBOL(cfg80211_unregister_wdev); 1172 1173 static const struct device_type wiphy_type = { 1174 .name = "wlan", 1175 }; 1176 1177 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 1178 enum nl80211_iftype iftype, int num) 1179 { 1180 lockdep_assert_held(&rdev->wiphy.mtx); 1181 1182 rdev->num_running_ifaces += num; 1183 if (iftype == NL80211_IFTYPE_MONITOR) 1184 rdev->num_running_monitor_ifaces += num; 1185 } 1186 1187 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 1188 struct wireless_dev *wdev) 1189 { 1190 struct net_device *dev = wdev->netdev; 1191 struct cfg80211_sched_scan_request *pos, *tmp; 1192 1193 lockdep_assert_held(&rdev->wiphy.mtx); 1194 ASSERT_WDEV_LOCK(wdev); 1195 1196 cfg80211_pmsr_wdev_down(wdev); 1197 1198 switch (wdev->iftype) { 1199 case NL80211_IFTYPE_ADHOC: 1200 __cfg80211_leave_ibss(rdev, dev, true); 1201 break; 1202 case NL80211_IFTYPE_P2P_CLIENT: 1203 case NL80211_IFTYPE_STATION: 1204 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, 1205 list) { 1206 if (dev == pos->dev) 1207 cfg80211_stop_sched_scan_req(rdev, pos, false); 1208 } 1209 1210 #ifdef CONFIG_CFG80211_WEXT 1211 kfree(wdev->wext.ie); 1212 wdev->wext.ie = NULL; 1213 wdev->wext.ie_len = 0; 1214 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1215 #endif 1216 cfg80211_disconnect(rdev, dev, 1217 WLAN_REASON_DEAUTH_LEAVING, true); 1218 break; 1219 case NL80211_IFTYPE_MESH_POINT: 1220 __cfg80211_leave_mesh(rdev, dev); 1221 break; 1222 case NL80211_IFTYPE_AP: 1223 case NL80211_IFTYPE_P2P_GO: 1224 __cfg80211_stop_ap(rdev, dev, true); 1225 break; 1226 case NL80211_IFTYPE_OCB: 1227 __cfg80211_leave_ocb(rdev, dev); 1228 break; 1229 case NL80211_IFTYPE_P2P_DEVICE: 1230 case NL80211_IFTYPE_NAN: 1231 /* cannot happen, has no netdev */ 1232 break; 1233 case NL80211_IFTYPE_AP_VLAN: 1234 case NL80211_IFTYPE_MONITOR: 1235 /* nothing to do */ 1236 break; 1237 case NL80211_IFTYPE_UNSPECIFIED: 1238 case NL80211_IFTYPE_WDS: 1239 case NUM_NL80211_IFTYPES: 1240 /* invalid */ 1241 break; 1242 } 1243 } 1244 1245 void cfg80211_leave(struct cfg80211_registered_device *rdev, 1246 struct wireless_dev *wdev) 1247 { 1248 wdev_lock(wdev); 1249 __cfg80211_leave(rdev, wdev); 1250 wdev_unlock(wdev); 1251 } 1252 1253 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 1254 gfp_t gfp) 1255 { 1256 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1257 struct cfg80211_event *ev; 1258 unsigned long flags; 1259 1260 trace_cfg80211_stop_iface(wiphy, wdev); 1261 1262 ev = kzalloc(sizeof(*ev), gfp); 1263 if (!ev) 1264 return; 1265 1266 ev->type = EVENT_STOPPED; 1267 1268 spin_lock_irqsave(&wdev->event_lock, flags); 1269 list_add_tail(&ev->list, &wdev->event_list); 1270 spin_unlock_irqrestore(&wdev->event_lock, flags); 1271 queue_work(cfg80211_wq, &rdev->event_work); 1272 } 1273 EXPORT_SYMBOL(cfg80211_stop_iface); 1274 1275 void cfg80211_init_wdev(struct wireless_dev *wdev) 1276 { 1277 mutex_init(&wdev->mtx); 1278 INIT_LIST_HEAD(&wdev->event_list); 1279 spin_lock_init(&wdev->event_lock); 1280 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1281 spin_lock_init(&wdev->mgmt_registrations_lock); 1282 INIT_LIST_HEAD(&wdev->pmsr_list); 1283 spin_lock_init(&wdev->pmsr_lock); 1284 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk); 1285 1286 #ifdef CONFIG_CFG80211_WEXT 1287 wdev->wext.default_key = -1; 1288 wdev->wext.default_mgmt_key = -1; 1289 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1290 #endif 1291 1292 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1293 wdev->ps = true; 1294 else 1295 wdev->ps = false; 1296 /* allow mac80211 to determine the timeout */ 1297 wdev->ps_timeout = -1; 1298 1299 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1300 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1301 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1302 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE; 1303 1304 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk); 1305 } 1306 1307 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev, 1308 struct wireless_dev *wdev) 1309 { 1310 ASSERT_RTNL(); 1311 lockdep_assert_held(&rdev->wiphy.mtx); 1312 1313 /* 1314 * We get here also when the interface changes network namespaces, 1315 * as it's registered into the new one, but we don't want it to 1316 * change ID in that case. Checking if the ID is already assigned 1317 * works, because 0 isn't considered a valid ID and the memory is 1318 * 0-initialized. 1319 */ 1320 if (!wdev->identifier) 1321 wdev->identifier = ++rdev->wdev_id; 1322 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list); 1323 rdev->devlist_generation++; 1324 wdev->registered = true; 1325 1326 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 1327 } 1328 1329 int cfg80211_register_netdevice(struct net_device *dev) 1330 { 1331 struct wireless_dev *wdev = dev->ieee80211_ptr; 1332 struct cfg80211_registered_device *rdev; 1333 int ret; 1334 1335 ASSERT_RTNL(); 1336 1337 if (WARN_ON(!wdev)) 1338 return -EINVAL; 1339 1340 rdev = wiphy_to_rdev(wdev->wiphy); 1341 1342 lockdep_assert_held(&rdev->wiphy.mtx); 1343 1344 /* we'll take care of this */ 1345 wdev->registered = true; 1346 ret = register_netdevice(dev); 1347 if (ret) 1348 goto out; 1349 1350 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 1351 "phy80211")) { 1352 pr_err("failed to add phy80211 symlink to netdev!\n"); 1353 unregister_netdevice(dev); 1354 ret = -EINVAL; 1355 goto out; 1356 } 1357 1358 cfg80211_register_wdev(rdev, wdev); 1359 ret = 0; 1360 out: 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) { 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->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