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 ASSERT_RTNL(); 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->scan_req->info.aborted = true; 241 ___cfg80211_scan_done(rdev, false); 242 } 243 } 244 245 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev, 246 struct wireless_dev *wdev) 247 { 248 ASSERT_RTNL(); 249 250 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN)) 251 return; 252 253 if (!wdev_running(wdev)) 254 return; 255 256 rdev_stop_nan(rdev, wdev); 257 wdev->is_running = false; 258 259 rdev->opencount--; 260 } 261 262 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy) 263 { 264 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 265 struct wireless_dev *wdev; 266 267 ASSERT_RTNL(); 268 269 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 270 if (wdev->netdev) { 271 dev_close(wdev->netdev); 272 continue; 273 } 274 /* otherwise, check iftype */ 275 switch (wdev->iftype) { 276 case NL80211_IFTYPE_P2P_DEVICE: 277 cfg80211_stop_p2p_device(rdev, wdev); 278 break; 279 case NL80211_IFTYPE_NAN: 280 cfg80211_stop_nan(rdev, wdev); 281 break; 282 default: 283 break; 284 } 285 } 286 } 287 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces); 288 289 static int cfg80211_rfkill_set_block(void *data, bool blocked) 290 { 291 struct cfg80211_registered_device *rdev = data; 292 293 if (!blocked) 294 return 0; 295 296 rtnl_lock(); 297 cfg80211_shutdown_all_interfaces(&rdev->wiphy); 298 rtnl_unlock(); 299 300 return 0; 301 } 302 303 static void cfg80211_rfkill_block_work(struct work_struct *work) 304 { 305 struct cfg80211_registered_device *rdev; 306 307 rdev = container_of(work, struct cfg80211_registered_device, 308 rfkill_block); 309 cfg80211_rfkill_set_block(rdev, true); 310 } 311 312 static void cfg80211_event_work(struct work_struct *work) 313 { 314 struct cfg80211_registered_device *rdev; 315 316 rdev = container_of(work, struct cfg80211_registered_device, 317 event_work); 318 319 rtnl_lock(); 320 cfg80211_process_rdev_events(rdev); 321 rtnl_unlock(); 322 } 323 324 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev) 325 { 326 struct wireless_dev *wdev, *tmp; 327 328 ASSERT_RTNL(); 329 330 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) { 331 if (wdev->nl_owner_dead) 332 rdev_del_virtual_intf(rdev, wdev); 333 } 334 } 335 336 static void cfg80211_destroy_iface_wk(struct work_struct *work) 337 { 338 struct cfg80211_registered_device *rdev; 339 340 rdev = container_of(work, struct cfg80211_registered_device, 341 destroy_work); 342 343 rtnl_lock(); 344 cfg80211_destroy_ifaces(rdev); 345 rtnl_unlock(); 346 } 347 348 static void cfg80211_sched_scan_stop_wk(struct work_struct *work) 349 { 350 struct cfg80211_registered_device *rdev; 351 struct cfg80211_sched_scan_request *req, *tmp; 352 353 rdev = container_of(work, struct cfg80211_registered_device, 354 sched_scan_stop_wk); 355 356 rtnl_lock(); 357 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { 358 if (req->nl_owner_dead) 359 cfg80211_stop_sched_scan_req(rdev, req, false); 360 } 361 rtnl_unlock(); 362 } 363 364 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work) 365 { 366 struct cfg80211_registered_device *rdev; 367 368 rdev = container_of(work, struct cfg80211_registered_device, 369 propagate_radar_detect_wk); 370 371 rtnl_lock(); 372 373 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef, 374 NL80211_DFS_UNAVAILABLE, 375 NL80211_RADAR_DETECTED); 376 377 rtnl_unlock(); 378 } 379 380 static void cfg80211_propagate_cac_done_wk(struct work_struct *work) 381 { 382 struct cfg80211_registered_device *rdev; 383 384 rdev = container_of(work, struct cfg80211_registered_device, 385 propagate_cac_done_wk); 386 387 rtnl_lock(); 388 389 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef, 390 NL80211_DFS_AVAILABLE, 391 NL80211_RADAR_CAC_FINISHED); 392 393 rtnl_unlock(); 394 } 395 396 /* exported functions */ 397 398 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, 399 const char *requested_name) 400 { 401 static atomic_t wiphy_counter = ATOMIC_INIT(0); 402 403 struct cfg80211_registered_device *rdev; 404 int alloc_size; 405 406 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 407 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 408 WARN_ON(ops->connect && !ops->disconnect); 409 WARN_ON(ops->join_ibss && !ops->leave_ibss); 410 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 411 WARN_ON(ops->add_station && !ops->del_station); 412 WARN_ON(ops->add_mpath && !ops->del_mpath); 413 WARN_ON(ops->join_mesh && !ops->leave_mesh); 414 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device); 415 WARN_ON(ops->start_ap && !ops->stop_ap); 416 WARN_ON(ops->join_ocb && !ops->leave_ocb); 417 WARN_ON(ops->suspend && !ops->resume); 418 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop); 419 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel); 420 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch); 421 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts); 422 423 alloc_size = sizeof(*rdev) + sizeof_priv; 424 425 rdev = kzalloc(alloc_size, GFP_KERNEL); 426 if (!rdev) 427 return NULL; 428 429 rdev->ops = ops; 430 431 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 432 433 if (unlikely(rdev->wiphy_idx < 0)) { 434 /* ugh, wrapped! */ 435 atomic_dec(&wiphy_counter); 436 kfree(rdev); 437 return NULL; 438 } 439 440 /* atomic_inc_return makes it start at 1, make it start at 0 */ 441 rdev->wiphy_idx--; 442 443 /* give it a proper name */ 444 if (requested_name && requested_name[0]) { 445 int rv; 446 447 rtnl_lock(); 448 rv = cfg80211_dev_check_name(rdev, requested_name); 449 450 if (rv < 0) { 451 rtnl_unlock(); 452 goto use_default_name; 453 } 454 455 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); 456 rtnl_unlock(); 457 if (rv) 458 goto use_default_name; 459 } else { 460 int rv; 461 462 use_default_name: 463 /* NOTE: This is *probably* safe w/out holding rtnl because of 464 * the restrictions on phy names. Probably this call could 465 * fail if some other part of the kernel (re)named a device 466 * phyX. But, might should add some locking and check return 467 * value, and use a different name if this one exists? 468 */ 469 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 470 if (rv < 0) { 471 kfree(rdev); 472 return NULL; 473 } 474 } 475 476 INIT_LIST_HEAD(&rdev->wiphy.wdev_list); 477 INIT_LIST_HEAD(&rdev->beacon_registrations); 478 spin_lock_init(&rdev->beacon_registrations_lock); 479 spin_lock_init(&rdev->bss_lock); 480 INIT_LIST_HEAD(&rdev->bss_list); 481 INIT_LIST_HEAD(&rdev->sched_scan_req_list); 482 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 483 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 484 cfg80211_dfs_channels_update_work); 485 #ifdef CONFIG_CFG80211_WEXT 486 rdev->wiphy.wext = &cfg80211_wext_handler; 487 #endif 488 489 device_initialize(&rdev->wiphy.dev); 490 rdev->wiphy.dev.class = &ieee80211_class; 491 rdev->wiphy.dev.platform_data = rdev; 492 device_enable_async_suspend(&rdev->wiphy.dev); 493 494 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 495 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 496 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk); 497 INIT_WORK(&rdev->propagate_radar_detect_wk, 498 cfg80211_propagate_radar_detect_wk); 499 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk); 500 INIT_WORK(&rdev->mgmt_registrations_update_wk, 501 cfg80211_mgmt_registrations_update_wk); 502 503 #ifdef CONFIG_CFG80211_DEFAULT_PS 504 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 505 #endif 506 507 wiphy_net_set(&rdev->wiphy, &init_net); 508 509 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 510 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 511 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 512 &rdev->rfkill_ops, rdev); 513 514 if (!rdev->rfkill) { 515 wiphy_free(&rdev->wiphy); 516 return NULL; 517 } 518 519 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work); 520 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 521 INIT_WORK(&rdev->event_work, cfg80211_event_work); 522 523 init_waitqueue_head(&rdev->dev_wait); 524 525 /* 526 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 527 * Fragmentation and RTS threshold are disabled by default with the 528 * special -1 value. 529 */ 530 rdev->wiphy.retry_short = 7; 531 rdev->wiphy.retry_long = 4; 532 rdev->wiphy.frag_threshold = (u32) -1; 533 rdev->wiphy.rts_threshold = (u32) -1; 534 rdev->wiphy.coverage_class = 0; 535 536 rdev->wiphy.max_num_csa_counters = 1; 537 538 rdev->wiphy.max_sched_scan_plans = 1; 539 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 540 541 return &rdev->wiphy; 542 } 543 EXPORT_SYMBOL(wiphy_new_nm); 544 545 static int wiphy_verify_combinations(struct wiphy *wiphy) 546 { 547 const struct ieee80211_iface_combination *c; 548 int i, j; 549 550 for (i = 0; i < wiphy->n_iface_combinations; i++) { 551 u32 cnt = 0; 552 u16 all_iftypes = 0; 553 554 c = &wiphy->iface_combinations[i]; 555 556 /* 557 * Combinations with just one interface aren't real, 558 * however we make an exception for DFS. 559 */ 560 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 561 return -EINVAL; 562 563 /* Need at least one channel */ 564 if (WARN_ON(!c->num_different_channels)) 565 return -EINVAL; 566 567 /* 568 * Put a sane limit on maximum number of different 569 * channels to simplify channel accounting code. 570 */ 571 if (WARN_ON(c->num_different_channels > 572 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 573 return -EINVAL; 574 575 /* DFS only works on one channel. */ 576 if (WARN_ON(c->radar_detect_widths && 577 (c->num_different_channels > 1))) 578 return -EINVAL; 579 580 if (WARN_ON(!c->n_limits)) 581 return -EINVAL; 582 583 for (j = 0; j < c->n_limits; j++) { 584 u16 types = c->limits[j].types; 585 586 /* interface types shouldn't overlap */ 587 if (WARN_ON(types & all_iftypes)) 588 return -EINVAL; 589 all_iftypes |= types; 590 591 if (WARN_ON(!c->limits[j].max)) 592 return -EINVAL; 593 594 /* Shouldn't list software iftypes in combinations! */ 595 if (WARN_ON(wiphy->software_iftypes & types)) 596 return -EINVAL; 597 598 /* Only a single P2P_DEVICE can be allowed */ 599 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 600 c->limits[j].max > 1)) 601 return -EINVAL; 602 603 /* Only a single NAN can be allowed */ 604 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) && 605 c->limits[j].max > 1)) 606 return -EINVAL; 607 608 /* 609 * This isn't well-defined right now. If you have an 610 * IBSS interface, then its beacon interval may change 611 * by joining other networks, and nothing prevents it 612 * from doing that. 613 * So technically we probably shouldn't even allow AP 614 * and IBSS in the same interface, but it seems that 615 * some drivers support that, possibly only with fixed 616 * beacon intervals for IBSS. 617 */ 618 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) && 619 c->beacon_int_min_gcd)) { 620 return -EINVAL; 621 } 622 623 cnt += c->limits[j].max; 624 /* 625 * Don't advertise an unsupported type 626 * in a combination. 627 */ 628 if (WARN_ON((wiphy->interface_modes & types) != types)) 629 return -EINVAL; 630 } 631 632 #ifndef CONFIG_WIRELESS_WDS 633 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS))) 634 return -EINVAL; 635 #endif 636 637 /* You can't even choose that many! */ 638 if (WARN_ON(cnt < c->max_interfaces)) 639 return -EINVAL; 640 } 641 642 return 0; 643 } 644 645 int wiphy_register(struct wiphy *wiphy) 646 { 647 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 648 int res; 649 enum nl80211_band band; 650 struct ieee80211_supported_band *sband; 651 bool have_band = false; 652 int i; 653 u16 ifmodes = wiphy->interface_modes; 654 655 #ifdef CONFIG_PM 656 if (WARN_ON(wiphy->wowlan && 657 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 658 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 659 return -EINVAL; 660 if (WARN_ON(wiphy->wowlan && 661 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 662 !wiphy->wowlan->tcp)) 663 return -EINVAL; 664 #endif 665 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 666 (!rdev->ops->tdls_channel_switch || 667 !rdev->ops->tdls_cancel_channel_switch))) 668 return -EINVAL; 669 670 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) && 671 (!rdev->ops->start_nan || !rdev->ops->stop_nan || 672 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func || 673 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ))))) 674 return -EINVAL; 675 676 #ifndef CONFIG_WIRELESS_WDS 677 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))) 678 return -EINVAL; 679 #endif 680 681 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported)) 682 return -EINVAL; 683 684 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) { 685 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap && 686 !wiphy->pmsr_capa->ftm.non_asap)) 687 return -EINVAL; 688 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles || 689 !wiphy->pmsr_capa->ftm.bandwidths)) 690 return -EINVAL; 691 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles & 692 ~(BIT(NL80211_PREAMBLE_LEGACY) | 693 BIT(NL80211_PREAMBLE_HT) | 694 BIT(NL80211_PREAMBLE_VHT) | 695 BIT(NL80211_PREAMBLE_HE) | 696 BIT(NL80211_PREAMBLE_DMG)))) 697 return -EINVAL; 698 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based || 699 wiphy->pmsr_capa->ftm.non_trigger_based) && 700 !(wiphy->pmsr_capa->ftm.preambles & 701 BIT(NL80211_PREAMBLE_HE)))) 702 return -EINVAL; 703 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths & 704 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) | 705 BIT(NL80211_CHAN_WIDTH_20) | 706 BIT(NL80211_CHAN_WIDTH_40) | 707 BIT(NL80211_CHAN_WIDTH_80) | 708 BIT(NL80211_CHAN_WIDTH_80P80) | 709 BIT(NL80211_CHAN_WIDTH_160) | 710 BIT(NL80211_CHAN_WIDTH_5) | 711 BIT(NL80211_CHAN_WIDTH_10)))) 712 return -EINVAL; 713 } 714 715 /* 716 * if a wiphy has unsupported modes for regulatory channel enforcement, 717 * opt-out of enforcement checking 718 */ 719 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) | 720 BIT(NL80211_IFTYPE_P2P_CLIENT) | 721 BIT(NL80211_IFTYPE_AP) | 722 BIT(NL80211_IFTYPE_P2P_GO) | 723 BIT(NL80211_IFTYPE_ADHOC) | 724 BIT(NL80211_IFTYPE_P2P_DEVICE) | 725 BIT(NL80211_IFTYPE_NAN) | 726 BIT(NL80211_IFTYPE_AP_VLAN) | 727 BIT(NL80211_IFTYPE_MONITOR))) 728 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF; 729 730 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 731 (wiphy->regulatory_flags & 732 (REGULATORY_CUSTOM_REG | 733 REGULATORY_STRICT_REG | 734 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 735 REGULATORY_COUNTRY_IE_IGNORE)))) 736 return -EINVAL; 737 738 if (WARN_ON(wiphy->coalesce && 739 (!wiphy->coalesce->n_rules || 740 !wiphy->coalesce->n_patterns) && 741 (!wiphy->coalesce->pattern_min_len || 742 wiphy->coalesce->pattern_min_len > 743 wiphy->coalesce->pattern_max_len))) 744 return -EINVAL; 745 746 if (WARN_ON(wiphy->ap_sme_capa && 747 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 748 return -EINVAL; 749 750 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 751 return -EINVAL; 752 753 if (WARN_ON(wiphy->addresses && 754 !is_zero_ether_addr(wiphy->perm_addr) && 755 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 756 ETH_ALEN))) 757 return -EINVAL; 758 759 if (WARN_ON(wiphy->max_acl_mac_addrs && 760 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 761 !rdev->ops->set_mac_acl))) 762 return -EINVAL; 763 764 /* assure only valid behaviours are flagged by driver 765 * hence subtract 2 as bit 0 is invalid. 766 */ 767 if (WARN_ON(wiphy->bss_select_support && 768 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 769 return -EINVAL; 770 771 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy, 772 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) && 773 (!rdev->ops->set_pmk || !rdev->ops->del_pmk))) 774 return -EINVAL; 775 776 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) && 777 rdev->ops->update_connect_params)) 778 return -EINVAL; 779 780 if (wiphy->addresses) 781 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 782 783 /* sanity check ifmodes */ 784 WARN_ON(!ifmodes); 785 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 786 if (WARN_ON(ifmodes != wiphy->interface_modes)) 787 wiphy->interface_modes = ifmodes; 788 789 res = wiphy_verify_combinations(wiphy); 790 if (res) 791 return res; 792 793 /* sanity check supported bands/channels */ 794 for (band = 0; band < NUM_NL80211_BANDS; band++) { 795 u16 types = 0; 796 bool have_he = false; 797 798 sband = wiphy->bands[band]; 799 if (!sband) 800 continue; 801 802 sband->band = band; 803 if (WARN_ON(!sband->n_channels)) 804 return -EINVAL; 805 /* 806 * on 60GHz or sub-1Ghz band, there are no legacy rates, so 807 * n_bitrates is 0 808 */ 809 if (WARN_ON((band != NL80211_BAND_60GHZ && 810 band != NL80211_BAND_S1GHZ) && 811 !sband->n_bitrates)) 812 return -EINVAL; 813 814 if (WARN_ON(band == NL80211_BAND_6GHZ && 815 (sband->ht_cap.ht_supported || 816 sband->vht_cap.vht_supported))) 817 return -EINVAL; 818 819 /* 820 * Since cfg80211_disable_40mhz_24ghz is global, we can 821 * modify the sband's ht data even if the driver uses a 822 * global structure for that. 823 */ 824 if (cfg80211_disable_40mhz_24ghz && 825 band == NL80211_BAND_2GHZ && 826 sband->ht_cap.ht_supported) { 827 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 828 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 829 } 830 831 /* 832 * Since we use a u32 for rate bitmaps in 833 * ieee80211_get_response_rate, we cannot 834 * have more than 32 legacy rates. 835 */ 836 if (WARN_ON(sband->n_bitrates > 32)) 837 return -EINVAL; 838 839 for (i = 0; i < sband->n_channels; i++) { 840 sband->channels[i].orig_flags = 841 sband->channels[i].flags; 842 sband->channels[i].orig_mag = INT_MAX; 843 sband->channels[i].orig_mpwr = 844 sband->channels[i].max_power; 845 sband->channels[i].band = band; 846 847 if (WARN_ON(sband->channels[i].freq_offset >= 1000)) 848 return -EINVAL; 849 } 850 851 for (i = 0; i < sband->n_iftype_data; i++) { 852 const struct ieee80211_sband_iftype_data *iftd; 853 854 iftd = &sband->iftype_data[i]; 855 856 if (WARN_ON(!iftd->types_mask)) 857 return -EINVAL; 858 if (WARN_ON(types & iftd->types_mask)) 859 return -EINVAL; 860 861 /* at least one piece of information must be present */ 862 if (WARN_ON(!iftd->he_cap.has_he)) 863 return -EINVAL; 864 865 types |= iftd->types_mask; 866 867 if (i == 0) 868 have_he = iftd->he_cap.has_he; 869 else 870 have_he = have_he && 871 iftd->he_cap.has_he; 872 } 873 874 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ)) 875 return -EINVAL; 876 877 have_band = true; 878 } 879 880 if (!have_band) { 881 WARN_ON(1); 882 return -EINVAL; 883 } 884 885 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) { 886 /* 887 * Validate we have a policy (can be explicitly set to 888 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that 889 * we have at least one of doit/dumpit. 890 */ 891 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy)) 892 return -EINVAL; 893 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit && 894 !rdev->wiphy.vendor_commands[i].dumpit)) 895 return -EINVAL; 896 } 897 898 #ifdef CONFIG_PM 899 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 900 (!rdev->wiphy.wowlan->pattern_min_len || 901 rdev->wiphy.wowlan->pattern_min_len > 902 rdev->wiphy.wowlan->pattern_max_len))) 903 return -EINVAL; 904 #endif 905 906 /* check and set up bitrates */ 907 ieee80211_set_bitrate_flags(wiphy); 908 909 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 910 911 rtnl_lock(); 912 res = device_add(&rdev->wiphy.dev); 913 if (res) { 914 rtnl_unlock(); 915 return res; 916 } 917 918 /* set up regulatory info */ 919 wiphy_regulatory_register(wiphy); 920 921 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 922 cfg80211_rdev_list_generation++; 923 924 /* add to debugfs */ 925 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy), 926 ieee80211_debugfs_dir); 927 928 cfg80211_debugfs_rdev_add(rdev); 929 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 930 931 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 932 struct regulatory_request request; 933 934 request.wiphy_idx = get_wiphy_idx(wiphy); 935 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 936 request.alpha2[0] = '9'; 937 request.alpha2[1] = '9'; 938 939 nl80211_send_reg_change_event(&request); 940 } 941 942 /* Check that nobody globally advertises any capabilities they do not 943 * advertise on all possible interface types. 944 */ 945 if (wiphy->extended_capabilities_len && 946 wiphy->num_iftype_ext_capab && 947 wiphy->iftype_ext_capab) { 948 u8 supported_on_all, j; 949 const struct wiphy_iftype_ext_capab *capab; 950 951 capab = wiphy->iftype_ext_capab; 952 for (j = 0; j < wiphy->extended_capabilities_len; j++) { 953 if (capab[0].extended_capabilities_len > j) 954 supported_on_all = 955 capab[0].extended_capabilities[j]; 956 else 957 supported_on_all = 0x00; 958 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) { 959 if (j >= capab[i].extended_capabilities_len) { 960 supported_on_all = 0x00; 961 break; 962 } 963 supported_on_all &= 964 capab[i].extended_capabilities[j]; 965 } 966 if (WARN_ON(wiphy->extended_capabilities[j] & 967 ~supported_on_all)) 968 break; 969 } 970 } 971 972 rdev->wiphy.registered = true; 973 rtnl_unlock(); 974 975 res = rfkill_register(rdev->rfkill); 976 if (res) { 977 rfkill_destroy(rdev->rfkill); 978 rdev->rfkill = NULL; 979 wiphy_unregister(&rdev->wiphy); 980 return res; 981 } 982 983 return 0; 984 } 985 EXPORT_SYMBOL(wiphy_register); 986 987 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 988 { 989 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 990 991 if (!rdev->ops->rfkill_poll) 992 return; 993 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 994 rfkill_resume_polling(rdev->rfkill); 995 } 996 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 997 998 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 999 { 1000 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1001 1002 rfkill_pause_polling(rdev->rfkill); 1003 } 1004 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 1005 1006 void wiphy_unregister(struct wiphy *wiphy) 1007 { 1008 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1009 1010 wait_event(rdev->dev_wait, ({ 1011 int __count; 1012 rtnl_lock(); 1013 __count = rdev->opencount; 1014 rtnl_unlock(); 1015 __count == 0; })); 1016 1017 if (rdev->rfkill) 1018 rfkill_unregister(rdev->rfkill); 1019 1020 rtnl_lock(); 1021 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 1022 rdev->wiphy.registered = false; 1023 1024 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 1025 1026 /* 1027 * First remove the hardware from everywhere, this makes 1028 * it impossible to find from userspace. 1029 */ 1030 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 1031 list_del_rcu(&rdev->list); 1032 synchronize_rcu(); 1033 1034 /* 1035 * If this device got a regulatory hint tell core its 1036 * free to listen now to a new shiny device regulatory hint 1037 */ 1038 wiphy_regulatory_deregister(wiphy); 1039 1040 cfg80211_rdev_list_generation++; 1041 device_del(&rdev->wiphy.dev); 1042 1043 rtnl_unlock(); 1044 1045 flush_work(&rdev->scan_done_wk); 1046 cancel_work_sync(&rdev->conn_work); 1047 flush_work(&rdev->event_work); 1048 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 1049 flush_work(&rdev->destroy_work); 1050 flush_work(&rdev->sched_scan_stop_wk); 1051 flush_work(&rdev->propagate_radar_detect_wk); 1052 flush_work(&rdev->propagate_cac_done_wk); 1053 flush_work(&rdev->mgmt_registrations_update_wk); 1054 1055 #ifdef CONFIG_PM 1056 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 1057 rdev_set_wakeup(rdev, false); 1058 #endif 1059 cfg80211_rdev_free_wowlan(rdev); 1060 cfg80211_rdev_free_coalesce(rdev); 1061 } 1062 EXPORT_SYMBOL(wiphy_unregister); 1063 1064 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 1065 { 1066 struct cfg80211_internal_bss *scan, *tmp; 1067 struct cfg80211_beacon_registration *reg, *treg; 1068 rfkill_destroy(rdev->rfkill); 1069 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 1070 list_del(®->list); 1071 kfree(reg); 1072 } 1073 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 1074 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 1075 kfree(rdev); 1076 } 1077 1078 void wiphy_free(struct wiphy *wiphy) 1079 { 1080 put_device(&wiphy->dev); 1081 } 1082 EXPORT_SYMBOL(wiphy_free); 1083 1084 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 1085 { 1086 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1087 1088 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 1089 schedule_work(&rdev->rfkill_block); 1090 } 1091 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 1092 1093 void cfg80211_cqm_config_free(struct wireless_dev *wdev) 1094 { 1095 kfree(wdev->cqm_config); 1096 wdev->cqm_config = NULL; 1097 } 1098 1099 static void __cfg80211_unregister_wdev(struct wireless_dev *wdev, bool sync) 1100 { 1101 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1102 1103 ASSERT_RTNL(); 1104 1105 flush_work(&wdev->pmsr_free_wk); 1106 1107 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 1108 1109 list_del_rcu(&wdev->list); 1110 if (sync) 1111 synchronize_rcu(); 1112 rdev->devlist_generation++; 1113 1114 cfg80211_mlme_purge_registrations(wdev); 1115 1116 switch (wdev->iftype) { 1117 case NL80211_IFTYPE_P2P_DEVICE: 1118 cfg80211_stop_p2p_device(rdev, wdev); 1119 break; 1120 case NL80211_IFTYPE_NAN: 1121 cfg80211_stop_nan(rdev, wdev); 1122 break; 1123 default: 1124 break; 1125 } 1126 1127 #ifdef CONFIG_CFG80211_WEXT 1128 kfree_sensitive(wdev->wext.keys); 1129 wdev->wext.keys = NULL; 1130 #endif 1131 /* only initialized if we have a netdev */ 1132 if (wdev->netdev) 1133 flush_work(&wdev->disconnect_wk); 1134 1135 cfg80211_cqm_config_free(wdev); 1136 } 1137 1138 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 1139 { 1140 if (WARN_ON(wdev->netdev)) 1141 return; 1142 1143 __cfg80211_unregister_wdev(wdev, true); 1144 } 1145 EXPORT_SYMBOL(cfg80211_unregister_wdev); 1146 1147 static const struct device_type wiphy_type = { 1148 .name = "wlan", 1149 }; 1150 1151 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 1152 enum nl80211_iftype iftype, int num) 1153 { 1154 ASSERT_RTNL(); 1155 1156 rdev->num_running_ifaces += num; 1157 if (iftype == NL80211_IFTYPE_MONITOR) 1158 rdev->num_running_monitor_ifaces += num; 1159 } 1160 1161 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 1162 struct wireless_dev *wdev) 1163 { 1164 struct net_device *dev = wdev->netdev; 1165 struct cfg80211_sched_scan_request *pos, *tmp; 1166 1167 ASSERT_RTNL(); 1168 ASSERT_WDEV_LOCK(wdev); 1169 1170 cfg80211_pmsr_wdev_down(wdev); 1171 1172 switch (wdev->iftype) { 1173 case NL80211_IFTYPE_ADHOC: 1174 __cfg80211_leave_ibss(rdev, dev, true); 1175 break; 1176 case NL80211_IFTYPE_P2P_CLIENT: 1177 case NL80211_IFTYPE_STATION: 1178 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, 1179 list) { 1180 if (dev == pos->dev) 1181 cfg80211_stop_sched_scan_req(rdev, pos, false); 1182 } 1183 1184 #ifdef CONFIG_CFG80211_WEXT 1185 kfree(wdev->wext.ie); 1186 wdev->wext.ie = NULL; 1187 wdev->wext.ie_len = 0; 1188 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1189 #endif 1190 cfg80211_disconnect(rdev, dev, 1191 WLAN_REASON_DEAUTH_LEAVING, true); 1192 break; 1193 case NL80211_IFTYPE_MESH_POINT: 1194 __cfg80211_leave_mesh(rdev, dev); 1195 break; 1196 case NL80211_IFTYPE_AP: 1197 case NL80211_IFTYPE_P2P_GO: 1198 __cfg80211_stop_ap(rdev, dev, true); 1199 break; 1200 case NL80211_IFTYPE_OCB: 1201 __cfg80211_leave_ocb(rdev, dev); 1202 break; 1203 case NL80211_IFTYPE_WDS: 1204 /* must be handled by mac80211/driver, has no APIs */ 1205 break; 1206 case NL80211_IFTYPE_P2P_DEVICE: 1207 case NL80211_IFTYPE_NAN: 1208 /* cannot happen, has no netdev */ 1209 break; 1210 case NL80211_IFTYPE_AP_VLAN: 1211 case NL80211_IFTYPE_MONITOR: 1212 /* nothing to do */ 1213 break; 1214 case NL80211_IFTYPE_UNSPECIFIED: 1215 case NUM_NL80211_IFTYPES: 1216 /* invalid */ 1217 break; 1218 } 1219 } 1220 1221 void cfg80211_leave(struct cfg80211_registered_device *rdev, 1222 struct wireless_dev *wdev) 1223 { 1224 wdev_lock(wdev); 1225 __cfg80211_leave(rdev, wdev); 1226 wdev_unlock(wdev); 1227 } 1228 1229 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 1230 gfp_t gfp) 1231 { 1232 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1233 struct cfg80211_event *ev; 1234 unsigned long flags; 1235 1236 trace_cfg80211_stop_iface(wiphy, wdev); 1237 1238 ev = kzalloc(sizeof(*ev), gfp); 1239 if (!ev) 1240 return; 1241 1242 ev->type = EVENT_STOPPED; 1243 1244 spin_lock_irqsave(&wdev->event_lock, flags); 1245 list_add_tail(&ev->list, &wdev->event_list); 1246 spin_unlock_irqrestore(&wdev->event_lock, flags); 1247 queue_work(cfg80211_wq, &rdev->event_work); 1248 } 1249 EXPORT_SYMBOL(cfg80211_stop_iface); 1250 1251 void cfg80211_init_wdev(struct cfg80211_registered_device *rdev, 1252 struct wireless_dev *wdev) 1253 { 1254 mutex_init(&wdev->mtx); 1255 INIT_LIST_HEAD(&wdev->event_list); 1256 spin_lock_init(&wdev->event_lock); 1257 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1258 spin_lock_init(&wdev->mgmt_registrations_lock); 1259 INIT_LIST_HEAD(&wdev->pmsr_list); 1260 spin_lock_init(&wdev->pmsr_lock); 1261 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk); 1262 1263 /* 1264 * We get here also when the interface changes network namespaces, 1265 * as it's registered into the new one, but we don't want it to 1266 * change ID in that case. Checking if the ID is already assigned 1267 * works, because 0 isn't considered a valid ID and the memory is 1268 * 0-initialized. 1269 */ 1270 if (!wdev->identifier) 1271 wdev->identifier = ++rdev->wdev_id; 1272 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list); 1273 rdev->devlist_generation++; 1274 1275 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 1276 } 1277 1278 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 1279 unsigned long state, void *ptr) 1280 { 1281 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1282 struct wireless_dev *wdev = dev->ieee80211_ptr; 1283 struct cfg80211_registered_device *rdev; 1284 struct cfg80211_sched_scan_request *pos, *tmp; 1285 1286 if (!wdev) 1287 return NOTIFY_DONE; 1288 1289 rdev = wiphy_to_rdev(wdev->wiphy); 1290 1291 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 1292 1293 switch (state) { 1294 case NETDEV_POST_INIT: 1295 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 1296 break; 1297 case NETDEV_REGISTER: 1298 /* 1299 * NB: cannot take rdev->mtx here because this may be 1300 * called within code protected by it when interfaces 1301 * are added with nl80211. 1302 */ 1303 /* can only change netns with wiphy */ 1304 dev->features |= NETIF_F_NETNS_LOCAL; 1305 1306 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 1307 "phy80211")) { 1308 pr_err("failed to add phy80211 symlink to netdev!\n"); 1309 } 1310 wdev->netdev = dev; 1311 #ifdef CONFIG_CFG80211_WEXT 1312 wdev->wext.default_key = -1; 1313 wdev->wext.default_mgmt_key = -1; 1314 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1315 #endif 1316 1317 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1318 wdev->ps = true; 1319 else 1320 wdev->ps = false; 1321 /* allow mac80211 to determine the timeout */ 1322 wdev->ps_timeout = -1; 1323 1324 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1325 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1326 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1327 dev->priv_flags |= IFF_DONT_BRIDGE; 1328 1329 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk); 1330 1331 cfg80211_init_wdev(rdev, wdev); 1332 break; 1333 case NETDEV_GOING_DOWN: 1334 cfg80211_leave(rdev, wdev); 1335 break; 1336 case NETDEV_DOWN: 1337 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1338 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1339 if (WARN_ON(!rdev->scan_req->notified)) 1340 rdev->scan_req->info.aborted = true; 1341 ___cfg80211_scan_done(rdev, false); 1342 } 1343 1344 list_for_each_entry_safe(pos, tmp, 1345 &rdev->sched_scan_req_list, list) { 1346 if (WARN_ON(pos->dev == wdev->netdev)) 1347 cfg80211_stop_sched_scan_req(rdev, pos, false); 1348 } 1349 1350 rdev->opencount--; 1351 wake_up(&rdev->dev_wait); 1352 break; 1353 case NETDEV_UP: 1354 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1355 wdev_lock(wdev); 1356 switch (wdev->iftype) { 1357 #ifdef CONFIG_CFG80211_WEXT 1358 case NL80211_IFTYPE_ADHOC: 1359 cfg80211_ibss_wext_join(rdev, wdev); 1360 break; 1361 case NL80211_IFTYPE_STATION: 1362 cfg80211_mgd_wext_connect(rdev, wdev); 1363 break; 1364 #endif 1365 #ifdef CONFIG_MAC80211_MESH 1366 case NL80211_IFTYPE_MESH_POINT: 1367 { 1368 /* backward compat code... */ 1369 struct mesh_setup setup; 1370 memcpy(&setup, &default_mesh_setup, 1371 sizeof(setup)); 1372 /* back compat only needed for mesh_id */ 1373 setup.mesh_id = wdev->ssid; 1374 setup.mesh_id_len = wdev->mesh_id_up_len; 1375 if (wdev->mesh_id_up_len) 1376 __cfg80211_join_mesh(rdev, dev, 1377 &setup, 1378 &default_mesh_config); 1379 break; 1380 } 1381 #endif 1382 default: 1383 break; 1384 } 1385 wdev_unlock(wdev); 1386 rdev->opencount++; 1387 1388 /* 1389 * Configure power management to the driver here so that its 1390 * correctly set also after interface type changes etc. 1391 */ 1392 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1393 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1394 rdev->ops->set_power_mgmt && 1395 rdev_set_power_mgmt(rdev, dev, wdev->ps, 1396 wdev->ps_timeout)) { 1397 /* assume this means it's off */ 1398 wdev->ps = false; 1399 } 1400 break; 1401 case NETDEV_UNREGISTER: 1402 /* 1403 * It is possible to get NETDEV_UNREGISTER 1404 * multiple times. To detect that, check 1405 * that the interface is still on the list 1406 * of registered interfaces, and only then 1407 * remove and clean it up. 1408 */ 1409 if (!list_empty(&wdev->list)) { 1410 __cfg80211_unregister_wdev(wdev, false); 1411 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 1412 } 1413 /* 1414 * synchronise (so that we won't find this netdev 1415 * from other code any more) and then clear the list 1416 * head so that the above code can safely check for 1417 * !list_empty() to avoid double-cleanup. 1418 */ 1419 synchronize_rcu(); 1420 INIT_LIST_HEAD(&wdev->list); 1421 /* 1422 * Ensure that all events have been processed and 1423 * freed. 1424 */ 1425 cfg80211_process_wdev_events(wdev); 1426 1427 if (WARN_ON(wdev->current_bss)) { 1428 cfg80211_unhold_bss(wdev->current_bss); 1429 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 1430 wdev->current_bss = NULL; 1431 } 1432 break; 1433 case NETDEV_PRE_UP: 1434 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype, 1435 wdev->use_4addr, 0)) 1436 return notifier_from_errno(-EOPNOTSUPP); 1437 1438 if (rfkill_blocked(rdev->rfkill)) 1439 return notifier_from_errno(-ERFKILL); 1440 break; 1441 default: 1442 return NOTIFY_DONE; 1443 } 1444 1445 wireless_nlevent_flush(); 1446 1447 return NOTIFY_OK; 1448 } 1449 1450 static struct notifier_block cfg80211_netdev_notifier = { 1451 .notifier_call = cfg80211_netdev_notifier_call, 1452 }; 1453 1454 static void __net_exit cfg80211_pernet_exit(struct net *net) 1455 { 1456 struct cfg80211_registered_device *rdev; 1457 1458 rtnl_lock(); 1459 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1460 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1461 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1462 } 1463 rtnl_unlock(); 1464 } 1465 1466 static struct pernet_operations cfg80211_pernet_ops = { 1467 .exit = cfg80211_pernet_exit, 1468 }; 1469 1470 static int __init cfg80211_init(void) 1471 { 1472 int err; 1473 1474 err = register_pernet_device(&cfg80211_pernet_ops); 1475 if (err) 1476 goto out_fail_pernet; 1477 1478 err = wiphy_sysfs_init(); 1479 if (err) 1480 goto out_fail_sysfs; 1481 1482 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1483 if (err) 1484 goto out_fail_notifier; 1485 1486 err = nl80211_init(); 1487 if (err) 1488 goto out_fail_nl80211; 1489 1490 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1491 1492 err = regulatory_init(); 1493 if (err) 1494 goto out_fail_reg; 1495 1496 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM); 1497 if (!cfg80211_wq) { 1498 err = -ENOMEM; 1499 goto out_fail_wq; 1500 } 1501 1502 return 0; 1503 1504 out_fail_wq: 1505 regulatory_exit(); 1506 out_fail_reg: 1507 debugfs_remove(ieee80211_debugfs_dir); 1508 nl80211_exit(); 1509 out_fail_nl80211: 1510 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1511 out_fail_notifier: 1512 wiphy_sysfs_exit(); 1513 out_fail_sysfs: 1514 unregister_pernet_device(&cfg80211_pernet_ops); 1515 out_fail_pernet: 1516 return err; 1517 } 1518 fs_initcall(cfg80211_init); 1519 1520 static void __exit cfg80211_exit(void) 1521 { 1522 debugfs_remove(ieee80211_debugfs_dir); 1523 nl80211_exit(); 1524 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1525 wiphy_sysfs_exit(); 1526 regulatory_exit(); 1527 unregister_pernet_device(&cfg80211_pernet_ops); 1528 destroy_workqueue(cfg80211_wq); 1529 } 1530 module_exit(cfg80211_exit); 1531