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->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 ASSERT_RTNL(); 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 /* otherwise, check iftype */ 277 switch (wdev->iftype) { 278 case NL80211_IFTYPE_P2P_DEVICE: 279 cfg80211_stop_p2p_device(rdev, wdev); 280 break; 281 case NL80211_IFTYPE_NAN: 282 cfg80211_stop_nan(rdev, wdev); 283 break; 284 default: 285 break; 286 } 287 } 288 } 289 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces); 290 291 static int cfg80211_rfkill_set_block(void *data, bool blocked) 292 { 293 struct cfg80211_registered_device *rdev = data; 294 295 if (!blocked) 296 return 0; 297 298 rtnl_lock(); 299 cfg80211_shutdown_all_interfaces(&rdev->wiphy); 300 rtnl_unlock(); 301 302 return 0; 303 } 304 305 static void cfg80211_rfkill_block_work(struct work_struct *work) 306 { 307 struct cfg80211_registered_device *rdev; 308 309 rdev = container_of(work, struct cfg80211_registered_device, 310 rfkill_block); 311 cfg80211_rfkill_set_block(rdev, true); 312 } 313 314 static void cfg80211_event_work(struct work_struct *work) 315 { 316 struct cfg80211_registered_device *rdev; 317 318 rdev = container_of(work, struct cfg80211_registered_device, 319 event_work); 320 321 rtnl_lock(); 322 cfg80211_process_rdev_events(rdev); 323 rtnl_unlock(); 324 } 325 326 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev) 327 { 328 struct wireless_dev *wdev, *tmp; 329 330 ASSERT_RTNL(); 331 332 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) { 333 if (wdev->nl_owner_dead) 334 rdev_del_virtual_intf(rdev, wdev); 335 } 336 } 337 338 static void cfg80211_destroy_iface_wk(struct work_struct *work) 339 { 340 struct cfg80211_registered_device *rdev; 341 342 rdev = container_of(work, struct cfg80211_registered_device, 343 destroy_work); 344 345 rtnl_lock(); 346 cfg80211_destroy_ifaces(rdev); 347 rtnl_unlock(); 348 } 349 350 static void cfg80211_sched_scan_stop_wk(struct work_struct *work) 351 { 352 struct cfg80211_registered_device *rdev; 353 struct cfg80211_sched_scan_request *req, *tmp; 354 355 rdev = container_of(work, struct cfg80211_registered_device, 356 sched_scan_stop_wk); 357 358 rtnl_lock(); 359 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { 360 if (req->nl_owner_dead) 361 cfg80211_stop_sched_scan_req(rdev, req, false); 362 } 363 rtnl_unlock(); 364 } 365 366 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work) 367 { 368 struct cfg80211_registered_device *rdev; 369 370 rdev = container_of(work, struct cfg80211_registered_device, 371 propagate_radar_detect_wk); 372 373 rtnl_lock(); 374 375 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef, 376 NL80211_DFS_UNAVAILABLE, 377 NL80211_RADAR_DETECTED); 378 379 rtnl_unlock(); 380 } 381 382 static void cfg80211_propagate_cac_done_wk(struct work_struct *work) 383 { 384 struct cfg80211_registered_device *rdev; 385 386 rdev = container_of(work, struct cfg80211_registered_device, 387 propagate_cac_done_wk); 388 389 rtnl_lock(); 390 391 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef, 392 NL80211_DFS_AVAILABLE, 393 NL80211_RADAR_CAC_FINISHED); 394 395 rtnl_unlock(); 396 } 397 398 /* exported functions */ 399 400 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, 401 const char *requested_name) 402 { 403 static atomic_t wiphy_counter = ATOMIC_INIT(0); 404 405 struct cfg80211_registered_device *rdev; 406 int alloc_size; 407 408 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 409 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 410 WARN_ON(ops->connect && !ops->disconnect); 411 WARN_ON(ops->join_ibss && !ops->leave_ibss); 412 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 413 WARN_ON(ops->add_station && !ops->del_station); 414 WARN_ON(ops->add_mpath && !ops->del_mpath); 415 WARN_ON(ops->join_mesh && !ops->leave_mesh); 416 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device); 417 WARN_ON(ops->start_ap && !ops->stop_ap); 418 WARN_ON(ops->join_ocb && !ops->leave_ocb); 419 WARN_ON(ops->suspend && !ops->resume); 420 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop); 421 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel); 422 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch); 423 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts); 424 425 alloc_size = sizeof(*rdev) + sizeof_priv; 426 427 rdev = kzalloc(alloc_size, GFP_KERNEL); 428 if (!rdev) 429 return NULL; 430 431 rdev->ops = ops; 432 433 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 434 435 if (unlikely(rdev->wiphy_idx < 0)) { 436 /* ugh, wrapped! */ 437 atomic_dec(&wiphy_counter); 438 kfree(rdev); 439 return NULL; 440 } 441 442 /* atomic_inc_return makes it start at 1, make it start at 0 */ 443 rdev->wiphy_idx--; 444 445 /* give it a proper name */ 446 if (requested_name && requested_name[0]) { 447 int rv; 448 449 rtnl_lock(); 450 rv = cfg80211_dev_check_name(rdev, requested_name); 451 452 if (rv < 0) { 453 rtnl_unlock(); 454 goto use_default_name; 455 } 456 457 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); 458 rtnl_unlock(); 459 if (rv) 460 goto use_default_name; 461 } else { 462 int rv; 463 464 use_default_name: 465 /* NOTE: This is *probably* safe w/out holding rtnl because of 466 * the restrictions on phy names. Probably this call could 467 * fail if some other part of the kernel (re)named a device 468 * phyX. But, might should add some locking and check return 469 * value, and use a different name if this one exists? 470 */ 471 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 472 if (rv < 0) { 473 kfree(rdev); 474 return NULL; 475 } 476 } 477 478 INIT_LIST_HEAD(&rdev->wiphy.wdev_list); 479 INIT_LIST_HEAD(&rdev->beacon_registrations); 480 spin_lock_init(&rdev->beacon_registrations_lock); 481 spin_lock_init(&rdev->bss_lock); 482 INIT_LIST_HEAD(&rdev->bss_list); 483 INIT_LIST_HEAD(&rdev->sched_scan_req_list); 484 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 485 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 486 cfg80211_dfs_channels_update_work); 487 #ifdef CONFIG_CFG80211_WEXT 488 rdev->wiphy.wext = &cfg80211_wext_handler; 489 #endif 490 491 device_initialize(&rdev->wiphy.dev); 492 rdev->wiphy.dev.class = &ieee80211_class; 493 rdev->wiphy.dev.platform_data = rdev; 494 device_enable_async_suspend(&rdev->wiphy.dev); 495 496 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 497 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 498 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk); 499 INIT_WORK(&rdev->propagate_radar_detect_wk, 500 cfg80211_propagate_radar_detect_wk); 501 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk); 502 INIT_WORK(&rdev->mgmt_registrations_update_wk, 503 cfg80211_mgmt_registrations_update_wk); 504 505 #ifdef CONFIG_CFG80211_DEFAULT_PS 506 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 507 #endif 508 509 wiphy_net_set(&rdev->wiphy, &init_net); 510 511 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 512 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 513 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 514 &rdev->rfkill_ops, rdev); 515 516 if (!rdev->rfkill) { 517 wiphy_free(&rdev->wiphy); 518 return NULL; 519 } 520 521 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work); 522 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 523 INIT_WORK(&rdev->event_work, cfg80211_event_work); 524 525 init_waitqueue_head(&rdev->dev_wait); 526 527 /* 528 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 529 * Fragmentation and RTS threshold are disabled by default with the 530 * special -1 value. 531 */ 532 rdev->wiphy.retry_short = 7; 533 rdev->wiphy.retry_long = 4; 534 rdev->wiphy.frag_threshold = (u32) -1; 535 rdev->wiphy.rts_threshold = (u32) -1; 536 rdev->wiphy.coverage_class = 0; 537 538 rdev->wiphy.max_num_csa_counters = 1; 539 540 rdev->wiphy.max_sched_scan_plans = 1; 541 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 542 543 return &rdev->wiphy; 544 } 545 EXPORT_SYMBOL(wiphy_new_nm); 546 547 static int wiphy_verify_combinations(struct wiphy *wiphy) 548 { 549 const struct ieee80211_iface_combination *c; 550 int i, j; 551 552 for (i = 0; i < wiphy->n_iface_combinations; i++) { 553 u32 cnt = 0; 554 u16 all_iftypes = 0; 555 556 c = &wiphy->iface_combinations[i]; 557 558 /* 559 * Combinations with just one interface aren't real, 560 * however we make an exception for DFS. 561 */ 562 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 563 return -EINVAL; 564 565 /* Need at least one channel */ 566 if (WARN_ON(!c->num_different_channels)) 567 return -EINVAL; 568 569 /* 570 * Put a sane limit on maximum number of different 571 * channels to simplify channel accounting code. 572 */ 573 if (WARN_ON(c->num_different_channels > 574 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 575 return -EINVAL; 576 577 /* DFS only works on one channel. */ 578 if (WARN_ON(c->radar_detect_widths && 579 (c->num_different_channels > 1))) 580 return -EINVAL; 581 582 if (WARN_ON(!c->n_limits)) 583 return -EINVAL; 584 585 for (j = 0; j < c->n_limits; j++) { 586 u16 types = c->limits[j].types; 587 588 /* interface types shouldn't overlap */ 589 if (WARN_ON(types & all_iftypes)) 590 return -EINVAL; 591 all_iftypes |= types; 592 593 if (WARN_ON(!c->limits[j].max)) 594 return -EINVAL; 595 596 /* Shouldn't list software iftypes in combinations! */ 597 if (WARN_ON(wiphy->software_iftypes & types)) 598 return -EINVAL; 599 600 /* Only a single P2P_DEVICE can be allowed */ 601 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 602 c->limits[j].max > 1)) 603 return -EINVAL; 604 605 /* Only a single NAN can be allowed */ 606 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) && 607 c->limits[j].max > 1)) 608 return -EINVAL; 609 610 /* 611 * This isn't well-defined right now. If you have an 612 * IBSS interface, then its beacon interval may change 613 * by joining other networks, and nothing prevents it 614 * from doing that. 615 * So technically we probably shouldn't even allow AP 616 * and IBSS in the same interface, but it seems that 617 * some drivers support that, possibly only with fixed 618 * beacon intervals for IBSS. 619 */ 620 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) && 621 c->beacon_int_min_gcd)) { 622 return -EINVAL; 623 } 624 625 cnt += c->limits[j].max; 626 /* 627 * Don't advertise an unsupported type 628 * in a combination. 629 */ 630 if (WARN_ON((wiphy->interface_modes & types) != types)) 631 return -EINVAL; 632 } 633 634 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS))) 635 return -EINVAL; 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 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))) 677 return -EINVAL; 678 679 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported)) 680 return -EINVAL; 681 682 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) { 683 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap && 684 !wiphy->pmsr_capa->ftm.non_asap)) 685 return -EINVAL; 686 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles || 687 !wiphy->pmsr_capa->ftm.bandwidths)) 688 return -EINVAL; 689 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles & 690 ~(BIT(NL80211_PREAMBLE_LEGACY) | 691 BIT(NL80211_PREAMBLE_HT) | 692 BIT(NL80211_PREAMBLE_VHT) | 693 BIT(NL80211_PREAMBLE_HE) | 694 BIT(NL80211_PREAMBLE_DMG)))) 695 return -EINVAL; 696 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based || 697 wiphy->pmsr_capa->ftm.non_trigger_based) && 698 !(wiphy->pmsr_capa->ftm.preambles & 699 BIT(NL80211_PREAMBLE_HE)))) 700 return -EINVAL; 701 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths & 702 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) | 703 BIT(NL80211_CHAN_WIDTH_20) | 704 BIT(NL80211_CHAN_WIDTH_40) | 705 BIT(NL80211_CHAN_WIDTH_80) | 706 BIT(NL80211_CHAN_WIDTH_80P80) | 707 BIT(NL80211_CHAN_WIDTH_160) | 708 BIT(NL80211_CHAN_WIDTH_5) | 709 BIT(NL80211_CHAN_WIDTH_10)))) 710 return -EINVAL; 711 } 712 713 /* 714 * if a wiphy has unsupported modes for regulatory channel enforcement, 715 * opt-out of enforcement checking 716 */ 717 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) | 718 BIT(NL80211_IFTYPE_P2P_CLIENT) | 719 BIT(NL80211_IFTYPE_AP) | 720 BIT(NL80211_IFTYPE_P2P_GO) | 721 BIT(NL80211_IFTYPE_ADHOC) | 722 BIT(NL80211_IFTYPE_P2P_DEVICE) | 723 BIT(NL80211_IFTYPE_NAN) | 724 BIT(NL80211_IFTYPE_AP_VLAN) | 725 BIT(NL80211_IFTYPE_MONITOR))) 726 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF; 727 728 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 729 (wiphy->regulatory_flags & 730 (REGULATORY_CUSTOM_REG | 731 REGULATORY_STRICT_REG | 732 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 733 REGULATORY_COUNTRY_IE_IGNORE)))) 734 return -EINVAL; 735 736 if (WARN_ON(wiphy->coalesce && 737 (!wiphy->coalesce->n_rules || 738 !wiphy->coalesce->n_patterns) && 739 (!wiphy->coalesce->pattern_min_len || 740 wiphy->coalesce->pattern_min_len > 741 wiphy->coalesce->pattern_max_len))) 742 return -EINVAL; 743 744 if (WARN_ON(wiphy->ap_sme_capa && 745 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 746 return -EINVAL; 747 748 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 749 return -EINVAL; 750 751 if (WARN_ON(wiphy->addresses && 752 !is_zero_ether_addr(wiphy->perm_addr) && 753 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 754 ETH_ALEN))) 755 return -EINVAL; 756 757 if (WARN_ON(wiphy->max_acl_mac_addrs && 758 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 759 !rdev->ops->set_mac_acl))) 760 return -EINVAL; 761 762 /* assure only valid behaviours are flagged by driver 763 * hence subtract 2 as bit 0 is invalid. 764 */ 765 if (WARN_ON(wiphy->bss_select_support && 766 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 767 return -EINVAL; 768 769 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy, 770 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) && 771 (!rdev->ops->set_pmk || !rdev->ops->del_pmk))) 772 return -EINVAL; 773 774 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) && 775 rdev->ops->update_connect_params)) 776 return -EINVAL; 777 778 if (wiphy->addresses) 779 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 780 781 /* sanity check ifmodes */ 782 WARN_ON(!ifmodes); 783 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 784 if (WARN_ON(ifmodes != wiphy->interface_modes)) 785 wiphy->interface_modes = ifmodes; 786 787 res = wiphy_verify_combinations(wiphy); 788 if (res) 789 return res; 790 791 /* sanity check supported bands/channels */ 792 for (band = 0; band < NUM_NL80211_BANDS; band++) { 793 u16 types = 0; 794 bool have_he = false; 795 796 sband = wiphy->bands[band]; 797 if (!sband) 798 continue; 799 800 sband->band = band; 801 if (WARN_ON(!sband->n_channels)) 802 return -EINVAL; 803 /* 804 * on 60GHz or sub-1Ghz band, there are no legacy rates, so 805 * n_bitrates is 0 806 */ 807 if (WARN_ON((band != NL80211_BAND_60GHZ && 808 band != NL80211_BAND_S1GHZ) && 809 !sband->n_bitrates)) 810 return -EINVAL; 811 812 if (WARN_ON(band == NL80211_BAND_6GHZ && 813 (sband->ht_cap.ht_supported || 814 sband->vht_cap.vht_supported))) 815 return -EINVAL; 816 817 /* 818 * Since cfg80211_disable_40mhz_24ghz is global, we can 819 * modify the sband's ht data even if the driver uses a 820 * global structure for that. 821 */ 822 if (cfg80211_disable_40mhz_24ghz && 823 band == NL80211_BAND_2GHZ && 824 sband->ht_cap.ht_supported) { 825 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 826 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 827 } 828 829 /* 830 * Since we use a u32 for rate bitmaps in 831 * ieee80211_get_response_rate, we cannot 832 * have more than 32 legacy rates. 833 */ 834 if (WARN_ON(sband->n_bitrates > 32)) 835 return -EINVAL; 836 837 for (i = 0; i < sband->n_channels; i++) { 838 sband->channels[i].orig_flags = 839 sband->channels[i].flags; 840 sband->channels[i].orig_mag = INT_MAX; 841 sband->channels[i].orig_mpwr = 842 sband->channels[i].max_power; 843 sband->channels[i].band = band; 844 845 if (WARN_ON(sband->channels[i].freq_offset >= 1000)) 846 return -EINVAL; 847 } 848 849 for (i = 0; i < sband->n_iftype_data; i++) { 850 const struct ieee80211_sband_iftype_data *iftd; 851 852 iftd = &sband->iftype_data[i]; 853 854 if (WARN_ON(!iftd->types_mask)) 855 return -EINVAL; 856 if (WARN_ON(types & iftd->types_mask)) 857 return -EINVAL; 858 859 /* at least one piece of information must be present */ 860 if (WARN_ON(!iftd->he_cap.has_he)) 861 return -EINVAL; 862 863 types |= iftd->types_mask; 864 865 if (i == 0) 866 have_he = iftd->he_cap.has_he; 867 else 868 have_he = have_he && 869 iftd->he_cap.has_he; 870 } 871 872 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ)) 873 return -EINVAL; 874 875 have_band = true; 876 } 877 878 if (!have_band) { 879 WARN_ON(1); 880 return -EINVAL; 881 } 882 883 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) { 884 /* 885 * Validate we have a policy (can be explicitly set to 886 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that 887 * we have at least one of doit/dumpit. 888 */ 889 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy)) 890 return -EINVAL; 891 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit && 892 !rdev->wiphy.vendor_commands[i].dumpit)) 893 return -EINVAL; 894 } 895 896 #ifdef CONFIG_PM 897 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 898 (!rdev->wiphy.wowlan->pattern_min_len || 899 rdev->wiphy.wowlan->pattern_min_len > 900 rdev->wiphy.wowlan->pattern_max_len))) 901 return -EINVAL; 902 #endif 903 904 /* check and set up bitrates */ 905 ieee80211_set_bitrate_flags(wiphy); 906 907 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 908 909 rtnl_lock(); 910 res = device_add(&rdev->wiphy.dev); 911 if (res) { 912 rtnl_unlock(); 913 return res; 914 } 915 916 /* set up regulatory info */ 917 wiphy_regulatory_register(wiphy); 918 919 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 920 cfg80211_rdev_list_generation++; 921 922 /* add to debugfs */ 923 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy), 924 ieee80211_debugfs_dir); 925 926 cfg80211_debugfs_rdev_add(rdev); 927 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 928 929 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 930 struct regulatory_request request; 931 932 request.wiphy_idx = get_wiphy_idx(wiphy); 933 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 934 request.alpha2[0] = '9'; 935 request.alpha2[1] = '9'; 936 937 nl80211_send_reg_change_event(&request); 938 } 939 940 /* Check that nobody globally advertises any capabilities they do not 941 * advertise on all possible interface types. 942 */ 943 if (wiphy->extended_capabilities_len && 944 wiphy->num_iftype_ext_capab && 945 wiphy->iftype_ext_capab) { 946 u8 supported_on_all, j; 947 const struct wiphy_iftype_ext_capab *capab; 948 949 capab = wiphy->iftype_ext_capab; 950 for (j = 0; j < wiphy->extended_capabilities_len; j++) { 951 if (capab[0].extended_capabilities_len > j) 952 supported_on_all = 953 capab[0].extended_capabilities[j]; 954 else 955 supported_on_all = 0x00; 956 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) { 957 if (j >= capab[i].extended_capabilities_len) { 958 supported_on_all = 0x00; 959 break; 960 } 961 supported_on_all &= 962 capab[i].extended_capabilities[j]; 963 } 964 if (WARN_ON(wiphy->extended_capabilities[j] & 965 ~supported_on_all)) 966 break; 967 } 968 } 969 970 rdev->wiphy.registered = true; 971 rtnl_unlock(); 972 973 res = rfkill_register(rdev->rfkill); 974 if (res) { 975 rfkill_destroy(rdev->rfkill); 976 rdev->rfkill = NULL; 977 wiphy_unregister(&rdev->wiphy); 978 return res; 979 } 980 981 return 0; 982 } 983 EXPORT_SYMBOL(wiphy_register); 984 985 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 986 { 987 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 988 989 if (!rdev->ops->rfkill_poll) 990 return; 991 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 992 rfkill_resume_polling(rdev->rfkill); 993 } 994 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 995 996 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 997 { 998 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 999 1000 rfkill_pause_polling(rdev->rfkill); 1001 } 1002 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 1003 1004 void wiphy_unregister(struct wiphy *wiphy) 1005 { 1006 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1007 1008 wait_event(rdev->dev_wait, ({ 1009 int __count; 1010 rtnl_lock(); 1011 __count = rdev->opencount; 1012 rtnl_unlock(); 1013 __count == 0; })); 1014 1015 if (rdev->rfkill) 1016 rfkill_unregister(rdev->rfkill); 1017 1018 rtnl_lock(); 1019 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 1020 rdev->wiphy.registered = false; 1021 1022 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 1023 1024 /* 1025 * First remove the hardware from everywhere, this makes 1026 * it impossible to find from userspace. 1027 */ 1028 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 1029 list_del_rcu(&rdev->list); 1030 synchronize_rcu(); 1031 1032 /* 1033 * If this device got a regulatory hint tell core its 1034 * free to listen now to a new shiny device regulatory hint 1035 */ 1036 wiphy_regulatory_deregister(wiphy); 1037 1038 cfg80211_rdev_list_generation++; 1039 device_del(&rdev->wiphy.dev); 1040 1041 rtnl_unlock(); 1042 1043 flush_work(&rdev->scan_done_wk); 1044 cancel_work_sync(&rdev->conn_work); 1045 flush_work(&rdev->event_work); 1046 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 1047 flush_work(&rdev->destroy_work); 1048 flush_work(&rdev->sched_scan_stop_wk); 1049 flush_work(&rdev->propagate_radar_detect_wk); 1050 flush_work(&rdev->propagate_cac_done_wk); 1051 flush_work(&rdev->mgmt_registrations_update_wk); 1052 1053 #ifdef CONFIG_PM 1054 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 1055 rdev_set_wakeup(rdev, false); 1056 #endif 1057 cfg80211_rdev_free_wowlan(rdev); 1058 cfg80211_rdev_free_coalesce(rdev); 1059 } 1060 EXPORT_SYMBOL(wiphy_unregister); 1061 1062 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 1063 { 1064 struct cfg80211_internal_bss *scan, *tmp; 1065 struct cfg80211_beacon_registration *reg, *treg; 1066 rfkill_destroy(rdev->rfkill); 1067 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 1068 list_del(®->list); 1069 kfree(reg); 1070 } 1071 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 1072 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 1073 kfree(rdev); 1074 } 1075 1076 void wiphy_free(struct wiphy *wiphy) 1077 { 1078 put_device(&wiphy->dev); 1079 } 1080 EXPORT_SYMBOL(wiphy_free); 1081 1082 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 1083 { 1084 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1085 1086 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 1087 schedule_work(&rdev->rfkill_block); 1088 } 1089 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 1090 1091 void cfg80211_cqm_config_free(struct wireless_dev *wdev) 1092 { 1093 kfree(wdev->cqm_config); 1094 wdev->cqm_config = NULL; 1095 } 1096 1097 static void __cfg80211_unregister_wdev(struct wireless_dev *wdev, bool sync) 1098 { 1099 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1100 1101 ASSERT_RTNL(); 1102 1103 flush_work(&wdev->pmsr_free_wk); 1104 1105 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 1106 1107 list_del_rcu(&wdev->list); 1108 if (sync) 1109 synchronize_rcu(); 1110 rdev->devlist_generation++; 1111 1112 cfg80211_mlme_purge_registrations(wdev); 1113 1114 switch (wdev->iftype) { 1115 case NL80211_IFTYPE_P2P_DEVICE: 1116 cfg80211_stop_p2p_device(rdev, wdev); 1117 break; 1118 case NL80211_IFTYPE_NAN: 1119 cfg80211_stop_nan(rdev, wdev); 1120 break; 1121 default: 1122 break; 1123 } 1124 1125 #ifdef CONFIG_CFG80211_WEXT 1126 kfree_sensitive(wdev->wext.keys); 1127 wdev->wext.keys = NULL; 1128 #endif 1129 /* only initialized if we have a netdev */ 1130 if (wdev->netdev) 1131 flush_work(&wdev->disconnect_wk); 1132 1133 cfg80211_cqm_config_free(wdev); 1134 } 1135 1136 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 1137 { 1138 if (WARN_ON(wdev->netdev)) 1139 return; 1140 1141 __cfg80211_unregister_wdev(wdev, true); 1142 } 1143 EXPORT_SYMBOL(cfg80211_unregister_wdev); 1144 1145 static const struct device_type wiphy_type = { 1146 .name = "wlan", 1147 }; 1148 1149 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 1150 enum nl80211_iftype iftype, int num) 1151 { 1152 ASSERT_RTNL(); 1153 1154 rdev->num_running_ifaces += num; 1155 if (iftype == NL80211_IFTYPE_MONITOR) 1156 rdev->num_running_monitor_ifaces += num; 1157 } 1158 1159 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 1160 struct wireless_dev *wdev) 1161 { 1162 struct net_device *dev = wdev->netdev; 1163 struct cfg80211_sched_scan_request *pos, *tmp; 1164 1165 ASSERT_RTNL(); 1166 ASSERT_WDEV_LOCK(wdev); 1167 1168 cfg80211_pmsr_wdev_down(wdev); 1169 1170 switch (wdev->iftype) { 1171 case NL80211_IFTYPE_ADHOC: 1172 __cfg80211_leave_ibss(rdev, dev, true); 1173 break; 1174 case NL80211_IFTYPE_P2P_CLIENT: 1175 case NL80211_IFTYPE_STATION: 1176 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, 1177 list) { 1178 if (dev == pos->dev) 1179 cfg80211_stop_sched_scan_req(rdev, pos, false); 1180 } 1181 1182 #ifdef CONFIG_CFG80211_WEXT 1183 kfree(wdev->wext.ie); 1184 wdev->wext.ie = NULL; 1185 wdev->wext.ie_len = 0; 1186 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1187 #endif 1188 cfg80211_disconnect(rdev, dev, 1189 WLAN_REASON_DEAUTH_LEAVING, true); 1190 break; 1191 case NL80211_IFTYPE_MESH_POINT: 1192 __cfg80211_leave_mesh(rdev, dev); 1193 break; 1194 case NL80211_IFTYPE_AP: 1195 case NL80211_IFTYPE_P2P_GO: 1196 __cfg80211_stop_ap(rdev, dev, true); 1197 break; 1198 case NL80211_IFTYPE_OCB: 1199 __cfg80211_leave_ocb(rdev, dev); 1200 break; 1201 case NL80211_IFTYPE_P2P_DEVICE: 1202 case NL80211_IFTYPE_NAN: 1203 /* cannot happen, has no netdev */ 1204 break; 1205 case NL80211_IFTYPE_AP_VLAN: 1206 case NL80211_IFTYPE_MONITOR: 1207 /* nothing to do */ 1208 break; 1209 case NL80211_IFTYPE_UNSPECIFIED: 1210 case NL80211_IFTYPE_WDS: 1211 case NUM_NL80211_IFTYPES: 1212 /* invalid */ 1213 break; 1214 } 1215 } 1216 1217 void cfg80211_leave(struct cfg80211_registered_device *rdev, 1218 struct wireless_dev *wdev) 1219 { 1220 wdev_lock(wdev); 1221 __cfg80211_leave(rdev, wdev); 1222 wdev_unlock(wdev); 1223 } 1224 1225 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 1226 gfp_t gfp) 1227 { 1228 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1229 struct cfg80211_event *ev; 1230 unsigned long flags; 1231 1232 trace_cfg80211_stop_iface(wiphy, wdev); 1233 1234 ev = kzalloc(sizeof(*ev), gfp); 1235 if (!ev) 1236 return; 1237 1238 ev->type = EVENT_STOPPED; 1239 1240 spin_lock_irqsave(&wdev->event_lock, flags); 1241 list_add_tail(&ev->list, &wdev->event_list); 1242 spin_unlock_irqrestore(&wdev->event_lock, flags); 1243 queue_work(cfg80211_wq, &rdev->event_work); 1244 } 1245 EXPORT_SYMBOL(cfg80211_stop_iface); 1246 1247 void cfg80211_init_wdev(struct wireless_dev *wdev) 1248 { 1249 mutex_init(&wdev->mtx); 1250 INIT_LIST_HEAD(&wdev->event_list); 1251 spin_lock_init(&wdev->event_lock); 1252 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1253 spin_lock_init(&wdev->mgmt_registrations_lock); 1254 INIT_LIST_HEAD(&wdev->pmsr_list); 1255 spin_lock_init(&wdev->pmsr_lock); 1256 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk); 1257 1258 #ifdef CONFIG_CFG80211_WEXT 1259 wdev->wext.default_key = -1; 1260 wdev->wext.default_mgmt_key = -1; 1261 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1262 #endif 1263 1264 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1265 wdev->ps = true; 1266 else 1267 wdev->ps = false; 1268 /* allow mac80211 to determine the timeout */ 1269 wdev->ps_timeout = -1; 1270 1271 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1272 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1273 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1274 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE; 1275 1276 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk); 1277 } 1278 1279 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev, 1280 struct wireless_dev *wdev) 1281 { 1282 /* 1283 * We get here also when the interface changes network namespaces, 1284 * as it's registered into the new one, but we don't want it to 1285 * change ID in that case. Checking if the ID is already assigned 1286 * works, because 0 isn't considered a valid ID and the memory is 1287 * 0-initialized. 1288 */ 1289 if (!wdev->identifier) 1290 wdev->identifier = ++rdev->wdev_id; 1291 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list); 1292 rdev->devlist_generation++; 1293 1294 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 1295 } 1296 1297 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 1298 unsigned long state, void *ptr) 1299 { 1300 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1301 struct wireless_dev *wdev = dev->ieee80211_ptr; 1302 struct cfg80211_registered_device *rdev; 1303 struct cfg80211_sched_scan_request *pos, *tmp; 1304 1305 if (!wdev) 1306 return NOTIFY_DONE; 1307 1308 rdev = wiphy_to_rdev(wdev->wiphy); 1309 1310 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 1311 1312 switch (state) { 1313 case NETDEV_POST_INIT: 1314 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 1315 wdev->netdev = dev; 1316 /* can only change netns with wiphy */ 1317 dev->features |= NETIF_F_NETNS_LOCAL; 1318 1319 cfg80211_init_wdev(wdev); 1320 break; 1321 case NETDEV_REGISTER: 1322 /* 1323 * NB: cannot take rdev->mtx here because this may be 1324 * called within code protected by it when interfaces 1325 * are added with nl80211. 1326 */ 1327 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 1328 "phy80211")) { 1329 pr_err("failed to add phy80211 symlink to netdev!\n"); 1330 } 1331 1332 cfg80211_register_wdev(rdev, wdev); 1333 break; 1334 case NETDEV_GOING_DOWN: 1335 cfg80211_leave(rdev, wdev); 1336 break; 1337 case NETDEV_DOWN: 1338 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1339 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1340 if (WARN_ON(!rdev->scan_req->notified && 1341 (!rdev->int_scan_req || 1342 !rdev->int_scan_req->notified))) 1343 rdev->scan_req->info.aborted = true; 1344 ___cfg80211_scan_done(rdev, false); 1345 } 1346 1347 list_for_each_entry_safe(pos, tmp, 1348 &rdev->sched_scan_req_list, list) { 1349 if (WARN_ON(pos->dev == wdev->netdev)) 1350 cfg80211_stop_sched_scan_req(rdev, pos, false); 1351 } 1352 1353 rdev->opencount--; 1354 wake_up(&rdev->dev_wait); 1355 break; 1356 case NETDEV_UP: 1357 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1358 wdev_lock(wdev); 1359 switch (wdev->iftype) { 1360 #ifdef CONFIG_CFG80211_WEXT 1361 case NL80211_IFTYPE_ADHOC: 1362 cfg80211_ibss_wext_join(rdev, wdev); 1363 break; 1364 case NL80211_IFTYPE_STATION: 1365 cfg80211_mgd_wext_connect(rdev, wdev); 1366 break; 1367 #endif 1368 #ifdef CONFIG_MAC80211_MESH 1369 case NL80211_IFTYPE_MESH_POINT: 1370 { 1371 /* backward compat code... */ 1372 struct mesh_setup setup; 1373 memcpy(&setup, &default_mesh_setup, 1374 sizeof(setup)); 1375 /* back compat only needed for mesh_id */ 1376 setup.mesh_id = wdev->ssid; 1377 setup.mesh_id_len = wdev->mesh_id_up_len; 1378 if (wdev->mesh_id_up_len) 1379 __cfg80211_join_mesh(rdev, dev, 1380 &setup, 1381 &default_mesh_config); 1382 break; 1383 } 1384 #endif 1385 default: 1386 break; 1387 } 1388 wdev_unlock(wdev); 1389 rdev->opencount++; 1390 1391 /* 1392 * Configure power management to the driver here so that its 1393 * correctly set also after interface type changes etc. 1394 */ 1395 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1396 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1397 rdev->ops->set_power_mgmt && 1398 rdev_set_power_mgmt(rdev, dev, wdev->ps, 1399 wdev->ps_timeout)) { 1400 /* assume this means it's off */ 1401 wdev->ps = false; 1402 } 1403 break; 1404 case NETDEV_UNREGISTER: 1405 /* 1406 * It is possible to get NETDEV_UNREGISTER 1407 * multiple times. To detect that, check 1408 * that the interface is still on the list 1409 * of registered interfaces, and only then 1410 * remove and clean it up. 1411 */ 1412 if (!list_empty(&wdev->list)) { 1413 __cfg80211_unregister_wdev(wdev, false); 1414 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 1415 } 1416 /* 1417 * synchronise (so that we won't find this netdev 1418 * from other code any more) and then clear the list 1419 * head so that the above code can safely check for 1420 * !list_empty() to avoid double-cleanup. 1421 */ 1422 synchronize_rcu(); 1423 INIT_LIST_HEAD(&wdev->list); 1424 /* 1425 * Ensure that all events have been processed and 1426 * freed. 1427 */ 1428 cfg80211_process_wdev_events(wdev); 1429 1430 if (WARN_ON(wdev->current_bss)) { 1431 cfg80211_unhold_bss(wdev->current_bss); 1432 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 1433 wdev->current_bss = NULL; 1434 } 1435 break; 1436 case NETDEV_PRE_UP: 1437 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype, 1438 wdev->use_4addr, 0)) 1439 return notifier_from_errno(-EOPNOTSUPP); 1440 1441 if (rfkill_blocked(rdev->rfkill)) 1442 return notifier_from_errno(-ERFKILL); 1443 break; 1444 default: 1445 return NOTIFY_DONE; 1446 } 1447 1448 wireless_nlevent_flush(); 1449 1450 return NOTIFY_OK; 1451 } 1452 1453 static struct notifier_block cfg80211_netdev_notifier = { 1454 .notifier_call = cfg80211_netdev_notifier_call, 1455 }; 1456 1457 static void __net_exit cfg80211_pernet_exit(struct net *net) 1458 { 1459 struct cfg80211_registered_device *rdev; 1460 1461 rtnl_lock(); 1462 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1463 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1464 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1465 } 1466 rtnl_unlock(); 1467 } 1468 1469 static struct pernet_operations cfg80211_pernet_ops = { 1470 .exit = cfg80211_pernet_exit, 1471 }; 1472 1473 static int __init cfg80211_init(void) 1474 { 1475 int err; 1476 1477 err = register_pernet_device(&cfg80211_pernet_ops); 1478 if (err) 1479 goto out_fail_pernet; 1480 1481 err = wiphy_sysfs_init(); 1482 if (err) 1483 goto out_fail_sysfs; 1484 1485 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1486 if (err) 1487 goto out_fail_notifier; 1488 1489 err = nl80211_init(); 1490 if (err) 1491 goto out_fail_nl80211; 1492 1493 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1494 1495 err = regulatory_init(); 1496 if (err) 1497 goto out_fail_reg; 1498 1499 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM); 1500 if (!cfg80211_wq) { 1501 err = -ENOMEM; 1502 goto out_fail_wq; 1503 } 1504 1505 return 0; 1506 1507 out_fail_wq: 1508 regulatory_exit(); 1509 out_fail_reg: 1510 debugfs_remove(ieee80211_debugfs_dir); 1511 nl80211_exit(); 1512 out_fail_nl80211: 1513 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1514 out_fail_notifier: 1515 wiphy_sysfs_exit(); 1516 out_fail_sysfs: 1517 unregister_pernet_device(&cfg80211_pernet_ops); 1518 out_fail_pernet: 1519 return err; 1520 } 1521 fs_initcall(cfg80211_init); 1522 1523 static void __exit cfg80211_exit(void) 1524 { 1525 debugfs_remove(ieee80211_debugfs_dir); 1526 nl80211_exit(); 1527 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1528 wiphy_sysfs_exit(); 1529 regulatory_exit(); 1530 unregister_pernet_device(&cfg80211_pernet_ops); 1531 destroy_workqueue(cfg80211_wq); 1532 } 1533 module_exit(cfg80211_exit); 1534