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 spin_lock_init(&rdev->mgmt_registrations_lock); 528 529 #ifdef CONFIG_CFG80211_DEFAULT_PS 530 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 531 #endif 532 533 wiphy_net_set(&rdev->wiphy, &init_net); 534 535 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 536 rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 537 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 538 &rdev->rfkill_ops, rdev); 539 540 if (!rdev->wiphy.rfkill) { 541 wiphy_free(&rdev->wiphy); 542 return NULL; 543 } 544 545 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work); 546 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 547 INIT_WORK(&rdev->event_work, cfg80211_event_work); 548 549 init_waitqueue_head(&rdev->dev_wait); 550 551 /* 552 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 553 * Fragmentation and RTS threshold are disabled by default with the 554 * special -1 value. 555 */ 556 rdev->wiphy.retry_short = 7; 557 rdev->wiphy.retry_long = 4; 558 rdev->wiphy.frag_threshold = (u32) -1; 559 rdev->wiphy.rts_threshold = (u32) -1; 560 rdev->wiphy.coverage_class = 0; 561 562 rdev->wiphy.max_num_csa_counters = 1; 563 564 rdev->wiphy.max_sched_scan_plans = 1; 565 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 566 567 return &rdev->wiphy; 568 } 569 EXPORT_SYMBOL(wiphy_new_nm); 570 571 static int wiphy_verify_combinations(struct wiphy *wiphy) 572 { 573 const struct ieee80211_iface_combination *c; 574 int i, j; 575 576 for (i = 0; i < wiphy->n_iface_combinations; i++) { 577 u32 cnt = 0; 578 u16 all_iftypes = 0; 579 580 c = &wiphy->iface_combinations[i]; 581 582 /* 583 * Combinations with just one interface aren't real, 584 * however we make an exception for DFS. 585 */ 586 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 587 return -EINVAL; 588 589 /* Need at least one channel */ 590 if (WARN_ON(!c->num_different_channels)) 591 return -EINVAL; 592 593 /* DFS only works on one channel. */ 594 if (WARN_ON(c->radar_detect_widths && 595 (c->num_different_channels > 1))) 596 return -EINVAL; 597 598 if (WARN_ON(!c->n_limits)) 599 return -EINVAL; 600 601 for (j = 0; j < c->n_limits; j++) { 602 u16 types = c->limits[j].types; 603 604 /* interface types shouldn't overlap */ 605 if (WARN_ON(types & all_iftypes)) 606 return -EINVAL; 607 all_iftypes |= types; 608 609 if (WARN_ON(!c->limits[j].max)) 610 return -EINVAL; 611 612 /* Shouldn't list software iftypes in combinations! */ 613 if (WARN_ON(wiphy->software_iftypes & types)) 614 return -EINVAL; 615 616 /* Only a single P2P_DEVICE can be allowed */ 617 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 618 c->limits[j].max > 1)) 619 return -EINVAL; 620 621 /* Only a single NAN can be allowed */ 622 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) && 623 c->limits[j].max > 1)) 624 return -EINVAL; 625 626 /* 627 * This isn't well-defined right now. If you have an 628 * IBSS interface, then its beacon interval may change 629 * by joining other networks, and nothing prevents it 630 * from doing that. 631 * So technically we probably shouldn't even allow AP 632 * and IBSS in the same interface, but it seems that 633 * some drivers support that, possibly only with fixed 634 * beacon intervals for IBSS. 635 */ 636 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) && 637 c->beacon_int_min_gcd)) { 638 return -EINVAL; 639 } 640 641 cnt += c->limits[j].max; 642 /* 643 * Don't advertise an unsupported type 644 * in a combination. 645 */ 646 if (WARN_ON((wiphy->interface_modes & types) != types)) 647 return -EINVAL; 648 } 649 650 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS))) 651 return -EINVAL; 652 653 /* You can't even choose that many! */ 654 if (WARN_ON(cnt < c->max_interfaces)) 655 return -EINVAL; 656 } 657 658 return 0; 659 } 660 661 int wiphy_register(struct wiphy *wiphy) 662 { 663 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 664 int res; 665 enum nl80211_band band; 666 struct ieee80211_supported_band *sband; 667 bool have_band = false; 668 int i; 669 u16 ifmodes = wiphy->interface_modes; 670 671 #ifdef CONFIG_PM 672 if (WARN_ON(wiphy->wowlan && 673 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 674 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 675 return -EINVAL; 676 if (WARN_ON(wiphy->wowlan && 677 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 678 !wiphy->wowlan->tcp)) 679 return -EINVAL; 680 #endif 681 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 682 (!rdev->ops->tdls_channel_switch || 683 !rdev->ops->tdls_cancel_channel_switch))) 684 return -EINVAL; 685 686 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) && 687 (!rdev->ops->start_nan || !rdev->ops->stop_nan || 688 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func || 689 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ))))) 690 return -EINVAL; 691 692 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))) 693 return -EINVAL; 694 695 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported)) 696 return -EINVAL; 697 698 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) { 699 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap && 700 !wiphy->pmsr_capa->ftm.non_asap)) 701 return -EINVAL; 702 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles || 703 !wiphy->pmsr_capa->ftm.bandwidths)) 704 return -EINVAL; 705 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles & 706 ~(BIT(NL80211_PREAMBLE_LEGACY) | 707 BIT(NL80211_PREAMBLE_HT) | 708 BIT(NL80211_PREAMBLE_VHT) | 709 BIT(NL80211_PREAMBLE_HE) | 710 BIT(NL80211_PREAMBLE_DMG)))) 711 return -EINVAL; 712 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based || 713 wiphy->pmsr_capa->ftm.non_trigger_based) && 714 !(wiphy->pmsr_capa->ftm.preambles & 715 BIT(NL80211_PREAMBLE_HE)))) 716 return -EINVAL; 717 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths & 718 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) | 719 BIT(NL80211_CHAN_WIDTH_20) | 720 BIT(NL80211_CHAN_WIDTH_40) | 721 BIT(NL80211_CHAN_WIDTH_80) | 722 BIT(NL80211_CHAN_WIDTH_80P80) | 723 BIT(NL80211_CHAN_WIDTH_160) | 724 BIT(NL80211_CHAN_WIDTH_5) | 725 BIT(NL80211_CHAN_WIDTH_10)))) 726 return -EINVAL; 727 } 728 729 /* 730 * if a wiphy has unsupported modes for regulatory channel enforcement, 731 * opt-out of enforcement checking 732 */ 733 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) | 734 BIT(NL80211_IFTYPE_P2P_CLIENT) | 735 BIT(NL80211_IFTYPE_AP) | 736 BIT(NL80211_IFTYPE_P2P_GO) | 737 BIT(NL80211_IFTYPE_ADHOC) | 738 BIT(NL80211_IFTYPE_P2P_DEVICE) | 739 BIT(NL80211_IFTYPE_NAN) | 740 BIT(NL80211_IFTYPE_AP_VLAN) | 741 BIT(NL80211_IFTYPE_MONITOR))) 742 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF; 743 744 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 745 (wiphy->regulatory_flags & 746 (REGULATORY_CUSTOM_REG | 747 REGULATORY_STRICT_REG | 748 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 749 REGULATORY_COUNTRY_IE_IGNORE)))) 750 return -EINVAL; 751 752 if (WARN_ON(wiphy->coalesce && 753 (!wiphy->coalesce->n_rules || 754 !wiphy->coalesce->n_patterns) && 755 (!wiphy->coalesce->pattern_min_len || 756 wiphy->coalesce->pattern_min_len > 757 wiphy->coalesce->pattern_max_len))) 758 return -EINVAL; 759 760 if (WARN_ON(wiphy->ap_sme_capa && 761 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 762 return -EINVAL; 763 764 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 765 return -EINVAL; 766 767 if (WARN_ON(wiphy->addresses && 768 !is_zero_ether_addr(wiphy->perm_addr) && 769 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 770 ETH_ALEN))) 771 return -EINVAL; 772 773 if (WARN_ON(wiphy->max_acl_mac_addrs && 774 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 775 !rdev->ops->set_mac_acl))) 776 return -EINVAL; 777 778 /* assure only valid behaviours are flagged by driver 779 * hence subtract 2 as bit 0 is invalid. 780 */ 781 if (WARN_ON(wiphy->bss_select_support && 782 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 783 return -EINVAL; 784 785 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy, 786 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) && 787 (!rdev->ops->set_pmk || !rdev->ops->del_pmk))) 788 return -EINVAL; 789 790 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) && 791 rdev->ops->update_connect_params)) 792 return -EINVAL; 793 794 if (wiphy->addresses) 795 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 796 797 /* sanity check ifmodes */ 798 WARN_ON(!ifmodes); 799 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 800 if (WARN_ON(ifmodes != wiphy->interface_modes)) 801 wiphy->interface_modes = ifmodes; 802 803 res = wiphy_verify_combinations(wiphy); 804 if (res) 805 return res; 806 807 /* sanity check supported bands/channels */ 808 for (band = 0; band < NUM_NL80211_BANDS; band++) { 809 u16 types = 0; 810 bool have_he = false; 811 812 sband = wiphy->bands[band]; 813 if (!sband) 814 continue; 815 816 sband->band = band; 817 if (WARN_ON(!sband->n_channels)) 818 return -EINVAL; 819 /* 820 * on 60GHz or sub-1Ghz band, there are no legacy rates, so 821 * n_bitrates is 0 822 */ 823 if (WARN_ON((band != NL80211_BAND_60GHZ && 824 band != NL80211_BAND_S1GHZ) && 825 !sband->n_bitrates)) 826 return -EINVAL; 827 828 if (WARN_ON(band == NL80211_BAND_6GHZ && 829 (sband->ht_cap.ht_supported || 830 sband->vht_cap.vht_supported))) 831 return -EINVAL; 832 833 /* 834 * Since cfg80211_disable_40mhz_24ghz is global, we can 835 * modify the sband's ht data even if the driver uses a 836 * global structure for that. 837 */ 838 if (cfg80211_disable_40mhz_24ghz && 839 band == NL80211_BAND_2GHZ && 840 sband->ht_cap.ht_supported) { 841 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 842 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 843 } 844 845 /* 846 * Since we use a u32 for rate bitmaps in 847 * ieee80211_get_response_rate, we cannot 848 * have more than 32 legacy rates. 849 */ 850 if (WARN_ON(sband->n_bitrates > 32)) 851 return -EINVAL; 852 853 for (i = 0; i < sband->n_channels; i++) { 854 sband->channels[i].orig_flags = 855 sband->channels[i].flags; 856 sband->channels[i].orig_mag = INT_MAX; 857 sband->channels[i].orig_mpwr = 858 sband->channels[i].max_power; 859 sband->channels[i].band = band; 860 861 if (WARN_ON(sband->channels[i].freq_offset >= 1000)) 862 return -EINVAL; 863 } 864 865 for (i = 0; i < sband->n_iftype_data; i++) { 866 const struct ieee80211_sband_iftype_data *iftd; 867 868 iftd = &sband->iftype_data[i]; 869 870 if (WARN_ON(!iftd->types_mask)) 871 return -EINVAL; 872 if (WARN_ON(types & iftd->types_mask)) 873 return -EINVAL; 874 875 /* at least one piece of information must be present */ 876 if (WARN_ON(!iftd->he_cap.has_he)) 877 return -EINVAL; 878 879 types |= iftd->types_mask; 880 881 if (i == 0) 882 have_he = iftd->he_cap.has_he; 883 else 884 have_he = have_he && 885 iftd->he_cap.has_he; 886 } 887 888 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ)) 889 return -EINVAL; 890 891 have_band = true; 892 } 893 894 if (!have_band) { 895 WARN_ON(1); 896 return -EINVAL; 897 } 898 899 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) { 900 /* 901 * Validate we have a policy (can be explicitly set to 902 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that 903 * we have at least one of doit/dumpit. 904 */ 905 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy)) 906 return -EINVAL; 907 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit && 908 !rdev->wiphy.vendor_commands[i].dumpit)) 909 return -EINVAL; 910 } 911 912 #ifdef CONFIG_PM 913 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 914 (!rdev->wiphy.wowlan->pattern_min_len || 915 rdev->wiphy.wowlan->pattern_min_len > 916 rdev->wiphy.wowlan->pattern_max_len))) 917 return -EINVAL; 918 #endif 919 920 /* check and set up bitrates */ 921 ieee80211_set_bitrate_flags(wiphy); 922 923 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 924 925 rtnl_lock(); 926 res = device_add(&rdev->wiphy.dev); 927 if (res) { 928 rtnl_unlock(); 929 return res; 930 } 931 932 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 933 cfg80211_rdev_list_generation++; 934 935 /* add to debugfs */ 936 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy), 937 ieee80211_debugfs_dir); 938 939 cfg80211_debugfs_rdev_add(rdev); 940 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 941 942 /* set up regulatory info */ 943 wiphy_regulatory_register(wiphy); 944 945 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 946 struct regulatory_request request; 947 948 request.wiphy_idx = get_wiphy_idx(wiphy); 949 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 950 request.alpha2[0] = '9'; 951 request.alpha2[1] = '9'; 952 953 nl80211_send_reg_change_event(&request); 954 } 955 956 /* Check that nobody globally advertises any capabilities they do not 957 * advertise on all possible interface types. 958 */ 959 if (wiphy->extended_capabilities_len && 960 wiphy->num_iftype_ext_capab && 961 wiphy->iftype_ext_capab) { 962 u8 supported_on_all, j; 963 const struct wiphy_iftype_ext_capab *capab; 964 965 capab = wiphy->iftype_ext_capab; 966 for (j = 0; j < wiphy->extended_capabilities_len; j++) { 967 if (capab[0].extended_capabilities_len > j) 968 supported_on_all = 969 capab[0].extended_capabilities[j]; 970 else 971 supported_on_all = 0x00; 972 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) { 973 if (j >= capab[i].extended_capabilities_len) { 974 supported_on_all = 0x00; 975 break; 976 } 977 supported_on_all &= 978 capab[i].extended_capabilities[j]; 979 } 980 if (WARN_ON(wiphy->extended_capabilities[j] & 981 ~supported_on_all)) 982 break; 983 } 984 } 985 986 rdev->wiphy.registered = true; 987 rtnl_unlock(); 988 989 res = rfkill_register(rdev->wiphy.rfkill); 990 if (res) { 991 rfkill_destroy(rdev->wiphy.rfkill); 992 rdev->wiphy.rfkill = NULL; 993 wiphy_unregister(&rdev->wiphy); 994 return res; 995 } 996 997 return 0; 998 } 999 EXPORT_SYMBOL(wiphy_register); 1000 1001 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 1002 { 1003 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1004 1005 if (!rdev->ops->rfkill_poll) 1006 return; 1007 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 1008 rfkill_resume_polling(wiphy->rfkill); 1009 } 1010 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 1011 1012 void wiphy_unregister(struct wiphy *wiphy) 1013 { 1014 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1015 1016 wait_event(rdev->dev_wait, ({ 1017 int __count; 1018 wiphy_lock(&rdev->wiphy); 1019 __count = rdev->opencount; 1020 wiphy_unlock(&rdev->wiphy); 1021 __count == 0; })); 1022 1023 if (rdev->wiphy.rfkill) 1024 rfkill_unregister(rdev->wiphy.rfkill); 1025 1026 rtnl_lock(); 1027 wiphy_lock(&rdev->wiphy); 1028 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 1029 rdev->wiphy.registered = false; 1030 1031 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 1032 1033 /* 1034 * First remove the hardware from everywhere, this makes 1035 * it impossible to find from userspace. 1036 */ 1037 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 1038 list_del_rcu(&rdev->list); 1039 synchronize_rcu(); 1040 1041 /* 1042 * If this device got a regulatory hint tell core its 1043 * free to listen now to a new shiny device regulatory hint 1044 */ 1045 wiphy_regulatory_deregister(wiphy); 1046 1047 cfg80211_rdev_list_generation++; 1048 device_del(&rdev->wiphy.dev); 1049 1050 wiphy_unlock(&rdev->wiphy); 1051 rtnl_unlock(); 1052 1053 flush_work(&rdev->scan_done_wk); 1054 cancel_work_sync(&rdev->conn_work); 1055 flush_work(&rdev->event_work); 1056 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 1057 flush_work(&rdev->destroy_work); 1058 flush_work(&rdev->sched_scan_stop_wk); 1059 flush_work(&rdev->propagate_radar_detect_wk); 1060 flush_work(&rdev->propagate_cac_done_wk); 1061 flush_work(&rdev->mgmt_registrations_update_wk); 1062 1063 #ifdef CONFIG_PM 1064 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 1065 rdev_set_wakeup(rdev, false); 1066 #endif 1067 cfg80211_rdev_free_wowlan(rdev); 1068 cfg80211_rdev_free_coalesce(rdev); 1069 } 1070 EXPORT_SYMBOL(wiphy_unregister); 1071 1072 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 1073 { 1074 struct cfg80211_internal_bss *scan, *tmp; 1075 struct cfg80211_beacon_registration *reg, *treg; 1076 rfkill_destroy(rdev->wiphy.rfkill); 1077 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 1078 list_del(®->list); 1079 kfree(reg); 1080 } 1081 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 1082 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 1083 mutex_destroy(&rdev->wiphy.mtx); 1084 kfree(rdev); 1085 } 1086 1087 void wiphy_free(struct wiphy *wiphy) 1088 { 1089 put_device(&wiphy->dev); 1090 } 1091 EXPORT_SYMBOL(wiphy_free); 1092 1093 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked, 1094 enum rfkill_hard_block_reasons reason) 1095 { 1096 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1097 1098 if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason)) 1099 schedule_work(&rdev->rfkill_block); 1100 } 1101 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason); 1102 1103 void cfg80211_cqm_config_free(struct wireless_dev *wdev) 1104 { 1105 kfree(wdev->cqm_config); 1106 wdev->cqm_config = NULL; 1107 } 1108 1109 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev, 1110 bool unregister_netdev) 1111 { 1112 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1113 1114 ASSERT_RTNL(); 1115 lockdep_assert_held(&rdev->wiphy.mtx); 1116 1117 flush_work(&wdev->pmsr_free_wk); 1118 1119 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 1120 1121 wdev->registered = false; 1122 1123 if (wdev->netdev) { 1124 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211"); 1125 if (unregister_netdev) 1126 unregister_netdevice(wdev->netdev); 1127 } 1128 1129 list_del_rcu(&wdev->list); 1130 synchronize_net(); 1131 rdev->devlist_generation++; 1132 1133 cfg80211_mlme_purge_registrations(wdev); 1134 1135 switch (wdev->iftype) { 1136 case NL80211_IFTYPE_P2P_DEVICE: 1137 cfg80211_stop_p2p_device(rdev, wdev); 1138 break; 1139 case NL80211_IFTYPE_NAN: 1140 cfg80211_stop_nan(rdev, wdev); 1141 break; 1142 default: 1143 break; 1144 } 1145 1146 #ifdef CONFIG_CFG80211_WEXT 1147 kfree_sensitive(wdev->wext.keys); 1148 wdev->wext.keys = NULL; 1149 #endif 1150 /* only initialized if we have a netdev */ 1151 if (wdev->netdev) 1152 flush_work(&wdev->disconnect_wk); 1153 1154 cfg80211_cqm_config_free(wdev); 1155 1156 /* 1157 * Ensure that all events have been processed and 1158 * freed. 1159 */ 1160 cfg80211_process_wdev_events(wdev); 1161 1162 if (WARN_ON(wdev->current_bss)) { 1163 cfg80211_unhold_bss(wdev->current_bss); 1164 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 1165 wdev->current_bss = NULL; 1166 } 1167 } 1168 1169 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 1170 { 1171 _cfg80211_unregister_wdev(wdev, true); 1172 } 1173 EXPORT_SYMBOL(cfg80211_unregister_wdev); 1174 1175 static const struct device_type wiphy_type = { 1176 .name = "wlan", 1177 }; 1178 1179 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 1180 enum nl80211_iftype iftype, int num) 1181 { 1182 lockdep_assert_held(&rdev->wiphy.mtx); 1183 1184 rdev->num_running_ifaces += num; 1185 if (iftype == NL80211_IFTYPE_MONITOR) 1186 rdev->num_running_monitor_ifaces += num; 1187 } 1188 1189 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 1190 struct wireless_dev *wdev) 1191 { 1192 struct net_device *dev = wdev->netdev; 1193 struct cfg80211_sched_scan_request *pos, *tmp; 1194 1195 lockdep_assert_held(&rdev->wiphy.mtx); 1196 ASSERT_WDEV_LOCK(wdev); 1197 1198 cfg80211_pmsr_wdev_down(wdev); 1199 1200 switch (wdev->iftype) { 1201 case NL80211_IFTYPE_ADHOC: 1202 __cfg80211_leave_ibss(rdev, dev, true); 1203 break; 1204 case NL80211_IFTYPE_P2P_CLIENT: 1205 case NL80211_IFTYPE_STATION: 1206 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, 1207 list) { 1208 if (dev == pos->dev) 1209 cfg80211_stop_sched_scan_req(rdev, pos, false); 1210 } 1211 1212 #ifdef CONFIG_CFG80211_WEXT 1213 kfree(wdev->wext.ie); 1214 wdev->wext.ie = NULL; 1215 wdev->wext.ie_len = 0; 1216 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1217 #endif 1218 cfg80211_disconnect(rdev, dev, 1219 WLAN_REASON_DEAUTH_LEAVING, true); 1220 break; 1221 case NL80211_IFTYPE_MESH_POINT: 1222 __cfg80211_leave_mesh(rdev, dev); 1223 break; 1224 case NL80211_IFTYPE_AP: 1225 case NL80211_IFTYPE_P2P_GO: 1226 __cfg80211_stop_ap(rdev, dev, true); 1227 break; 1228 case NL80211_IFTYPE_OCB: 1229 __cfg80211_leave_ocb(rdev, dev); 1230 break; 1231 case NL80211_IFTYPE_P2P_DEVICE: 1232 case NL80211_IFTYPE_NAN: 1233 /* cannot happen, has no netdev */ 1234 break; 1235 case NL80211_IFTYPE_AP_VLAN: 1236 case NL80211_IFTYPE_MONITOR: 1237 /* nothing to do */ 1238 break; 1239 case NL80211_IFTYPE_UNSPECIFIED: 1240 case NL80211_IFTYPE_WDS: 1241 case NUM_NL80211_IFTYPES: 1242 /* invalid */ 1243 break; 1244 } 1245 } 1246 1247 void cfg80211_leave(struct cfg80211_registered_device *rdev, 1248 struct wireless_dev *wdev) 1249 { 1250 wdev_lock(wdev); 1251 __cfg80211_leave(rdev, wdev); 1252 wdev_unlock(wdev); 1253 } 1254 1255 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 1256 gfp_t gfp) 1257 { 1258 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1259 struct cfg80211_event *ev; 1260 unsigned long flags; 1261 1262 trace_cfg80211_stop_iface(wiphy, wdev); 1263 1264 ev = kzalloc(sizeof(*ev), gfp); 1265 if (!ev) 1266 return; 1267 1268 ev->type = EVENT_STOPPED; 1269 1270 spin_lock_irqsave(&wdev->event_lock, flags); 1271 list_add_tail(&ev->list, &wdev->event_list); 1272 spin_unlock_irqrestore(&wdev->event_lock, flags); 1273 queue_work(cfg80211_wq, &rdev->event_work); 1274 } 1275 EXPORT_SYMBOL(cfg80211_stop_iface); 1276 1277 void cfg80211_init_wdev(struct wireless_dev *wdev) 1278 { 1279 mutex_init(&wdev->mtx); 1280 INIT_LIST_HEAD(&wdev->event_list); 1281 spin_lock_init(&wdev->event_lock); 1282 INIT_LIST_HEAD(&wdev->mgmt_registrations); 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