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