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 #ifndef CONFIG_WIRELESS_WDS 635 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS))) 636 return -EINVAL; 637 #endif 638 639 /* You can't even choose that many! */ 640 if (WARN_ON(cnt < c->max_interfaces)) 641 return -EINVAL; 642 } 643 644 return 0; 645 } 646 647 int wiphy_register(struct wiphy *wiphy) 648 { 649 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 650 int res; 651 enum nl80211_band band; 652 struct ieee80211_supported_band *sband; 653 bool have_band = false; 654 int i; 655 u16 ifmodes = wiphy->interface_modes; 656 657 #ifdef CONFIG_PM 658 if (WARN_ON(wiphy->wowlan && 659 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 660 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 661 return -EINVAL; 662 if (WARN_ON(wiphy->wowlan && 663 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 664 !wiphy->wowlan->tcp)) 665 return -EINVAL; 666 #endif 667 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 668 (!rdev->ops->tdls_channel_switch || 669 !rdev->ops->tdls_cancel_channel_switch))) 670 return -EINVAL; 671 672 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) && 673 (!rdev->ops->start_nan || !rdev->ops->stop_nan || 674 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func || 675 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ))))) 676 return -EINVAL; 677 678 #ifndef CONFIG_WIRELESS_WDS 679 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))) 680 return -EINVAL; 681 #endif 682 683 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported)) 684 return -EINVAL; 685 686 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) { 687 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap && 688 !wiphy->pmsr_capa->ftm.non_asap)) 689 return -EINVAL; 690 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles || 691 !wiphy->pmsr_capa->ftm.bandwidths)) 692 return -EINVAL; 693 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles & 694 ~(BIT(NL80211_PREAMBLE_LEGACY) | 695 BIT(NL80211_PREAMBLE_HT) | 696 BIT(NL80211_PREAMBLE_VHT) | 697 BIT(NL80211_PREAMBLE_HE) | 698 BIT(NL80211_PREAMBLE_DMG)))) 699 return -EINVAL; 700 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based || 701 wiphy->pmsr_capa->ftm.non_trigger_based) && 702 !(wiphy->pmsr_capa->ftm.preambles & 703 BIT(NL80211_PREAMBLE_HE)))) 704 return -EINVAL; 705 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths & 706 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) | 707 BIT(NL80211_CHAN_WIDTH_20) | 708 BIT(NL80211_CHAN_WIDTH_40) | 709 BIT(NL80211_CHAN_WIDTH_80) | 710 BIT(NL80211_CHAN_WIDTH_80P80) | 711 BIT(NL80211_CHAN_WIDTH_160) | 712 BIT(NL80211_CHAN_WIDTH_5) | 713 BIT(NL80211_CHAN_WIDTH_10)))) 714 return -EINVAL; 715 } 716 717 /* 718 * if a wiphy has unsupported modes for regulatory channel enforcement, 719 * opt-out of enforcement checking 720 */ 721 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) | 722 BIT(NL80211_IFTYPE_P2P_CLIENT) | 723 BIT(NL80211_IFTYPE_AP) | 724 BIT(NL80211_IFTYPE_P2P_GO) | 725 BIT(NL80211_IFTYPE_ADHOC) | 726 BIT(NL80211_IFTYPE_P2P_DEVICE) | 727 BIT(NL80211_IFTYPE_NAN) | 728 BIT(NL80211_IFTYPE_AP_VLAN) | 729 BIT(NL80211_IFTYPE_MONITOR))) 730 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF; 731 732 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 733 (wiphy->regulatory_flags & 734 (REGULATORY_CUSTOM_REG | 735 REGULATORY_STRICT_REG | 736 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 737 REGULATORY_COUNTRY_IE_IGNORE)))) 738 return -EINVAL; 739 740 if (WARN_ON(wiphy->coalesce && 741 (!wiphy->coalesce->n_rules || 742 !wiphy->coalesce->n_patterns) && 743 (!wiphy->coalesce->pattern_min_len || 744 wiphy->coalesce->pattern_min_len > 745 wiphy->coalesce->pattern_max_len))) 746 return -EINVAL; 747 748 if (WARN_ON(wiphy->ap_sme_capa && 749 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 750 return -EINVAL; 751 752 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 753 return -EINVAL; 754 755 if (WARN_ON(wiphy->addresses && 756 !is_zero_ether_addr(wiphy->perm_addr) && 757 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 758 ETH_ALEN))) 759 return -EINVAL; 760 761 if (WARN_ON(wiphy->max_acl_mac_addrs && 762 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 763 !rdev->ops->set_mac_acl))) 764 return -EINVAL; 765 766 /* assure only valid behaviours are flagged by driver 767 * hence subtract 2 as bit 0 is invalid. 768 */ 769 if (WARN_ON(wiphy->bss_select_support && 770 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 771 return -EINVAL; 772 773 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy, 774 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) && 775 (!rdev->ops->set_pmk || !rdev->ops->del_pmk))) 776 return -EINVAL; 777 778 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) && 779 rdev->ops->update_connect_params)) 780 return -EINVAL; 781 782 if (wiphy->addresses) 783 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 784 785 /* sanity check ifmodes */ 786 WARN_ON(!ifmodes); 787 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 788 if (WARN_ON(ifmodes != wiphy->interface_modes)) 789 wiphy->interface_modes = ifmodes; 790 791 res = wiphy_verify_combinations(wiphy); 792 if (res) 793 return res; 794 795 /* sanity check supported bands/channels */ 796 for (band = 0; band < NUM_NL80211_BANDS; band++) { 797 u16 types = 0; 798 bool have_he = false; 799 800 sband = wiphy->bands[band]; 801 if (!sband) 802 continue; 803 804 sband->band = band; 805 if (WARN_ON(!sband->n_channels)) 806 return -EINVAL; 807 /* 808 * on 60GHz or sub-1Ghz band, there are no legacy rates, so 809 * n_bitrates is 0 810 */ 811 if (WARN_ON((band != NL80211_BAND_60GHZ && 812 band != NL80211_BAND_S1GHZ) && 813 !sband->n_bitrates)) 814 return -EINVAL; 815 816 if (WARN_ON(band == NL80211_BAND_6GHZ && 817 (sband->ht_cap.ht_supported || 818 sband->vht_cap.vht_supported))) 819 return -EINVAL; 820 821 /* 822 * Since cfg80211_disable_40mhz_24ghz is global, we can 823 * modify the sband's ht data even if the driver uses a 824 * global structure for that. 825 */ 826 if (cfg80211_disable_40mhz_24ghz && 827 band == NL80211_BAND_2GHZ && 828 sband->ht_cap.ht_supported) { 829 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 830 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 831 } 832 833 /* 834 * Since we use a u32 for rate bitmaps in 835 * ieee80211_get_response_rate, we cannot 836 * have more than 32 legacy rates. 837 */ 838 if (WARN_ON(sband->n_bitrates > 32)) 839 return -EINVAL; 840 841 for (i = 0; i < sband->n_channels; i++) { 842 sband->channels[i].orig_flags = 843 sband->channels[i].flags; 844 sband->channels[i].orig_mag = INT_MAX; 845 sband->channels[i].orig_mpwr = 846 sband->channels[i].max_power; 847 sband->channels[i].band = band; 848 849 if (WARN_ON(sband->channels[i].freq_offset >= 1000)) 850 return -EINVAL; 851 } 852 853 for (i = 0; i < sband->n_iftype_data; i++) { 854 const struct ieee80211_sband_iftype_data *iftd; 855 856 iftd = &sband->iftype_data[i]; 857 858 if (WARN_ON(!iftd->types_mask)) 859 return -EINVAL; 860 if (WARN_ON(types & iftd->types_mask)) 861 return -EINVAL; 862 863 /* at least one piece of information must be present */ 864 if (WARN_ON(!iftd->he_cap.has_he)) 865 return -EINVAL; 866 867 types |= iftd->types_mask; 868 869 if (i == 0) 870 have_he = iftd->he_cap.has_he; 871 else 872 have_he = have_he && 873 iftd->he_cap.has_he; 874 } 875 876 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ)) 877 return -EINVAL; 878 879 have_band = true; 880 } 881 882 if (!have_band) { 883 WARN_ON(1); 884 return -EINVAL; 885 } 886 887 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) { 888 /* 889 * Validate we have a policy (can be explicitly set to 890 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that 891 * we have at least one of doit/dumpit. 892 */ 893 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy)) 894 return -EINVAL; 895 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit && 896 !rdev->wiphy.vendor_commands[i].dumpit)) 897 return -EINVAL; 898 } 899 900 #ifdef CONFIG_PM 901 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 902 (!rdev->wiphy.wowlan->pattern_min_len || 903 rdev->wiphy.wowlan->pattern_min_len > 904 rdev->wiphy.wowlan->pattern_max_len))) 905 return -EINVAL; 906 #endif 907 908 /* check and set up bitrates */ 909 ieee80211_set_bitrate_flags(wiphy); 910 911 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 912 913 rtnl_lock(); 914 res = device_add(&rdev->wiphy.dev); 915 if (res) { 916 rtnl_unlock(); 917 return res; 918 } 919 920 /* set up regulatory info */ 921 wiphy_regulatory_register(wiphy); 922 923 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 924 cfg80211_rdev_list_generation++; 925 926 /* add to debugfs */ 927 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy), 928 ieee80211_debugfs_dir); 929 930 cfg80211_debugfs_rdev_add(rdev); 931 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 932 933 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 934 struct regulatory_request request; 935 936 request.wiphy_idx = get_wiphy_idx(wiphy); 937 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 938 request.alpha2[0] = '9'; 939 request.alpha2[1] = '9'; 940 941 nl80211_send_reg_change_event(&request); 942 } 943 944 /* Check that nobody globally advertises any capabilities they do not 945 * advertise on all possible interface types. 946 */ 947 if (wiphy->extended_capabilities_len && 948 wiphy->num_iftype_ext_capab && 949 wiphy->iftype_ext_capab) { 950 u8 supported_on_all, j; 951 const struct wiphy_iftype_ext_capab *capab; 952 953 capab = wiphy->iftype_ext_capab; 954 for (j = 0; j < wiphy->extended_capabilities_len; j++) { 955 if (capab[0].extended_capabilities_len > j) 956 supported_on_all = 957 capab[0].extended_capabilities[j]; 958 else 959 supported_on_all = 0x00; 960 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) { 961 if (j >= capab[i].extended_capabilities_len) { 962 supported_on_all = 0x00; 963 break; 964 } 965 supported_on_all &= 966 capab[i].extended_capabilities[j]; 967 } 968 if (WARN_ON(wiphy->extended_capabilities[j] & 969 ~supported_on_all)) 970 break; 971 } 972 } 973 974 rdev->wiphy.registered = true; 975 rtnl_unlock(); 976 977 res = rfkill_register(rdev->rfkill); 978 if (res) { 979 rfkill_destroy(rdev->rfkill); 980 rdev->rfkill = NULL; 981 wiphy_unregister(&rdev->wiphy); 982 return res; 983 } 984 985 return 0; 986 } 987 EXPORT_SYMBOL(wiphy_register); 988 989 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 990 { 991 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 992 993 if (!rdev->ops->rfkill_poll) 994 return; 995 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 996 rfkill_resume_polling(rdev->rfkill); 997 } 998 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 999 1000 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 1001 { 1002 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1003 1004 rfkill_pause_polling(rdev->rfkill); 1005 } 1006 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 1007 1008 void wiphy_unregister(struct wiphy *wiphy) 1009 { 1010 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1011 1012 wait_event(rdev->dev_wait, ({ 1013 int __count; 1014 rtnl_lock(); 1015 __count = rdev->opencount; 1016 rtnl_unlock(); 1017 __count == 0; })); 1018 1019 if (rdev->rfkill) 1020 rfkill_unregister(rdev->rfkill); 1021 1022 rtnl_lock(); 1023 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 1024 rdev->wiphy.registered = false; 1025 1026 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 1027 1028 /* 1029 * First remove the hardware from everywhere, this makes 1030 * it impossible to find from userspace. 1031 */ 1032 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 1033 list_del_rcu(&rdev->list); 1034 synchronize_rcu(); 1035 1036 /* 1037 * If this device got a regulatory hint tell core its 1038 * free to listen now to a new shiny device regulatory hint 1039 */ 1040 wiphy_regulatory_deregister(wiphy); 1041 1042 cfg80211_rdev_list_generation++; 1043 device_del(&rdev->wiphy.dev); 1044 1045 rtnl_unlock(); 1046 1047 flush_work(&rdev->scan_done_wk); 1048 cancel_work_sync(&rdev->conn_work); 1049 flush_work(&rdev->event_work); 1050 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 1051 flush_work(&rdev->destroy_work); 1052 flush_work(&rdev->sched_scan_stop_wk); 1053 flush_work(&rdev->propagate_radar_detect_wk); 1054 flush_work(&rdev->propagate_cac_done_wk); 1055 flush_work(&rdev->mgmt_registrations_update_wk); 1056 1057 #ifdef CONFIG_PM 1058 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 1059 rdev_set_wakeup(rdev, false); 1060 #endif 1061 cfg80211_rdev_free_wowlan(rdev); 1062 cfg80211_rdev_free_coalesce(rdev); 1063 } 1064 EXPORT_SYMBOL(wiphy_unregister); 1065 1066 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 1067 { 1068 struct cfg80211_internal_bss *scan, *tmp; 1069 struct cfg80211_beacon_registration *reg, *treg; 1070 rfkill_destroy(rdev->rfkill); 1071 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 1072 list_del(®->list); 1073 kfree(reg); 1074 } 1075 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 1076 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 1077 kfree(rdev); 1078 } 1079 1080 void wiphy_free(struct wiphy *wiphy) 1081 { 1082 put_device(&wiphy->dev); 1083 } 1084 EXPORT_SYMBOL(wiphy_free); 1085 1086 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 1087 { 1088 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1089 1090 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 1091 schedule_work(&rdev->rfkill_block); 1092 } 1093 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 1094 1095 void cfg80211_cqm_config_free(struct wireless_dev *wdev) 1096 { 1097 kfree(wdev->cqm_config); 1098 wdev->cqm_config = NULL; 1099 } 1100 1101 static void __cfg80211_unregister_wdev(struct wireless_dev *wdev, bool sync) 1102 { 1103 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1104 1105 ASSERT_RTNL(); 1106 1107 flush_work(&wdev->pmsr_free_wk); 1108 1109 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 1110 1111 list_del_rcu(&wdev->list); 1112 if (sync) 1113 synchronize_rcu(); 1114 rdev->devlist_generation++; 1115 1116 cfg80211_mlme_purge_registrations(wdev); 1117 1118 switch (wdev->iftype) { 1119 case NL80211_IFTYPE_P2P_DEVICE: 1120 cfg80211_stop_p2p_device(rdev, wdev); 1121 break; 1122 case NL80211_IFTYPE_NAN: 1123 cfg80211_stop_nan(rdev, wdev); 1124 break; 1125 default: 1126 break; 1127 } 1128 1129 #ifdef CONFIG_CFG80211_WEXT 1130 kfree_sensitive(wdev->wext.keys); 1131 wdev->wext.keys = NULL; 1132 #endif 1133 /* only initialized if we have a netdev */ 1134 if (wdev->netdev) 1135 flush_work(&wdev->disconnect_wk); 1136 1137 cfg80211_cqm_config_free(wdev); 1138 } 1139 1140 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 1141 { 1142 if (WARN_ON(wdev->netdev)) 1143 return; 1144 1145 __cfg80211_unregister_wdev(wdev, true); 1146 } 1147 EXPORT_SYMBOL(cfg80211_unregister_wdev); 1148 1149 static const struct device_type wiphy_type = { 1150 .name = "wlan", 1151 }; 1152 1153 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 1154 enum nl80211_iftype iftype, int num) 1155 { 1156 ASSERT_RTNL(); 1157 1158 rdev->num_running_ifaces += num; 1159 if (iftype == NL80211_IFTYPE_MONITOR) 1160 rdev->num_running_monitor_ifaces += num; 1161 } 1162 1163 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 1164 struct wireless_dev *wdev) 1165 { 1166 struct net_device *dev = wdev->netdev; 1167 struct cfg80211_sched_scan_request *pos, *tmp; 1168 1169 ASSERT_RTNL(); 1170 ASSERT_WDEV_LOCK(wdev); 1171 1172 cfg80211_pmsr_wdev_down(wdev); 1173 1174 switch (wdev->iftype) { 1175 case NL80211_IFTYPE_ADHOC: 1176 __cfg80211_leave_ibss(rdev, dev, true); 1177 break; 1178 case NL80211_IFTYPE_P2P_CLIENT: 1179 case NL80211_IFTYPE_STATION: 1180 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, 1181 list) { 1182 if (dev == pos->dev) 1183 cfg80211_stop_sched_scan_req(rdev, pos, false); 1184 } 1185 1186 #ifdef CONFIG_CFG80211_WEXT 1187 kfree(wdev->wext.ie); 1188 wdev->wext.ie = NULL; 1189 wdev->wext.ie_len = 0; 1190 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1191 #endif 1192 cfg80211_disconnect(rdev, dev, 1193 WLAN_REASON_DEAUTH_LEAVING, true); 1194 break; 1195 case NL80211_IFTYPE_MESH_POINT: 1196 __cfg80211_leave_mesh(rdev, dev); 1197 break; 1198 case NL80211_IFTYPE_AP: 1199 case NL80211_IFTYPE_P2P_GO: 1200 __cfg80211_stop_ap(rdev, dev, true); 1201 break; 1202 case NL80211_IFTYPE_OCB: 1203 __cfg80211_leave_ocb(rdev, dev); 1204 break; 1205 case NL80211_IFTYPE_WDS: 1206 /* must be handled by mac80211/driver, has no APIs */ 1207 break; 1208 case NL80211_IFTYPE_P2P_DEVICE: 1209 case NL80211_IFTYPE_NAN: 1210 /* cannot happen, has no netdev */ 1211 break; 1212 case NL80211_IFTYPE_AP_VLAN: 1213 case NL80211_IFTYPE_MONITOR: 1214 /* nothing to do */ 1215 break; 1216 case NL80211_IFTYPE_UNSPECIFIED: 1217 case NUM_NL80211_IFTYPES: 1218 /* invalid */ 1219 break; 1220 } 1221 } 1222 1223 void cfg80211_leave(struct cfg80211_registered_device *rdev, 1224 struct wireless_dev *wdev) 1225 { 1226 wdev_lock(wdev); 1227 __cfg80211_leave(rdev, wdev); 1228 wdev_unlock(wdev); 1229 } 1230 1231 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 1232 gfp_t gfp) 1233 { 1234 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1235 struct cfg80211_event *ev; 1236 unsigned long flags; 1237 1238 trace_cfg80211_stop_iface(wiphy, wdev); 1239 1240 ev = kzalloc(sizeof(*ev), gfp); 1241 if (!ev) 1242 return; 1243 1244 ev->type = EVENT_STOPPED; 1245 1246 spin_lock_irqsave(&wdev->event_lock, flags); 1247 list_add_tail(&ev->list, &wdev->event_list); 1248 spin_unlock_irqrestore(&wdev->event_lock, flags); 1249 queue_work(cfg80211_wq, &rdev->event_work); 1250 } 1251 EXPORT_SYMBOL(cfg80211_stop_iface); 1252 1253 void cfg80211_init_wdev(struct cfg80211_registered_device *rdev, 1254 struct wireless_dev *wdev) 1255 { 1256 mutex_init(&wdev->mtx); 1257 INIT_LIST_HEAD(&wdev->event_list); 1258 spin_lock_init(&wdev->event_lock); 1259 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1260 spin_lock_init(&wdev->mgmt_registrations_lock); 1261 INIT_LIST_HEAD(&wdev->pmsr_list); 1262 spin_lock_init(&wdev->pmsr_lock); 1263 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk); 1264 1265 /* 1266 * We get here also when the interface changes network namespaces, 1267 * as it's registered into the new one, but we don't want it to 1268 * change ID in that case. Checking if the ID is already assigned 1269 * works, because 0 isn't considered a valid ID and the memory is 1270 * 0-initialized. 1271 */ 1272 if (!wdev->identifier) 1273 wdev->identifier = ++rdev->wdev_id; 1274 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list); 1275 rdev->devlist_generation++; 1276 1277 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 1278 } 1279 1280 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 1281 unsigned long state, void *ptr) 1282 { 1283 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1284 struct wireless_dev *wdev = dev->ieee80211_ptr; 1285 struct cfg80211_registered_device *rdev; 1286 struct cfg80211_sched_scan_request *pos, *tmp; 1287 1288 if (!wdev) 1289 return NOTIFY_DONE; 1290 1291 rdev = wiphy_to_rdev(wdev->wiphy); 1292 1293 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 1294 1295 switch (state) { 1296 case NETDEV_POST_INIT: 1297 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 1298 break; 1299 case NETDEV_REGISTER: 1300 /* 1301 * NB: cannot take rdev->mtx here because this may be 1302 * called within code protected by it when interfaces 1303 * are added with nl80211. 1304 */ 1305 /* can only change netns with wiphy */ 1306 dev->features |= NETIF_F_NETNS_LOCAL; 1307 1308 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 1309 "phy80211")) { 1310 pr_err("failed to add phy80211 symlink to netdev!\n"); 1311 } 1312 wdev->netdev = dev; 1313 #ifdef CONFIG_CFG80211_WEXT 1314 wdev->wext.default_key = -1; 1315 wdev->wext.default_mgmt_key = -1; 1316 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1317 #endif 1318 1319 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1320 wdev->ps = true; 1321 else 1322 wdev->ps = false; 1323 /* allow mac80211 to determine the timeout */ 1324 wdev->ps_timeout = -1; 1325 1326 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1327 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1328 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1329 dev->priv_flags |= IFF_DONT_BRIDGE; 1330 1331 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk); 1332 1333 cfg80211_init_wdev(rdev, wdev); 1334 break; 1335 case NETDEV_GOING_DOWN: 1336 cfg80211_leave(rdev, wdev); 1337 break; 1338 case NETDEV_DOWN: 1339 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1340 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1341 if (WARN_ON(!rdev->scan_req->notified && 1342 (!rdev->int_scan_req || 1343 !rdev->int_scan_req->notified))) 1344 rdev->scan_req->info.aborted = true; 1345 ___cfg80211_scan_done(rdev, false); 1346 } 1347 1348 list_for_each_entry_safe(pos, tmp, 1349 &rdev->sched_scan_req_list, list) { 1350 if (WARN_ON(pos->dev == wdev->netdev)) 1351 cfg80211_stop_sched_scan_req(rdev, pos, false); 1352 } 1353 1354 rdev->opencount--; 1355 wake_up(&rdev->dev_wait); 1356 break; 1357 case NETDEV_UP: 1358 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1359 wdev_lock(wdev); 1360 switch (wdev->iftype) { 1361 #ifdef CONFIG_CFG80211_WEXT 1362 case NL80211_IFTYPE_ADHOC: 1363 cfg80211_ibss_wext_join(rdev, wdev); 1364 break; 1365 case NL80211_IFTYPE_STATION: 1366 cfg80211_mgd_wext_connect(rdev, wdev); 1367 break; 1368 #endif 1369 #ifdef CONFIG_MAC80211_MESH 1370 case NL80211_IFTYPE_MESH_POINT: 1371 { 1372 /* backward compat code... */ 1373 struct mesh_setup setup; 1374 memcpy(&setup, &default_mesh_setup, 1375 sizeof(setup)); 1376 /* back compat only needed for mesh_id */ 1377 setup.mesh_id = wdev->ssid; 1378 setup.mesh_id_len = wdev->mesh_id_up_len; 1379 if (wdev->mesh_id_up_len) 1380 __cfg80211_join_mesh(rdev, dev, 1381 &setup, 1382 &default_mesh_config); 1383 break; 1384 } 1385 #endif 1386 default: 1387 break; 1388 } 1389 wdev_unlock(wdev); 1390 rdev->opencount++; 1391 1392 /* 1393 * Configure power management to the driver here so that its 1394 * correctly set also after interface type changes etc. 1395 */ 1396 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1397 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1398 rdev->ops->set_power_mgmt && 1399 rdev_set_power_mgmt(rdev, dev, wdev->ps, 1400 wdev->ps_timeout)) { 1401 /* assume this means it's off */ 1402 wdev->ps = false; 1403 } 1404 break; 1405 case NETDEV_UNREGISTER: 1406 /* 1407 * It is possible to get NETDEV_UNREGISTER 1408 * multiple times. To detect that, check 1409 * that the interface is still on the list 1410 * of registered interfaces, and only then 1411 * remove and clean it up. 1412 */ 1413 if (!list_empty(&wdev->list)) { 1414 __cfg80211_unregister_wdev(wdev, false); 1415 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 1416 } 1417 /* 1418 * synchronise (so that we won't find this netdev 1419 * from other code any more) and then clear the list 1420 * head so that the above code can safely check for 1421 * !list_empty() to avoid double-cleanup. 1422 */ 1423 synchronize_rcu(); 1424 INIT_LIST_HEAD(&wdev->list); 1425 /* 1426 * Ensure that all events have been processed and 1427 * freed. 1428 */ 1429 cfg80211_process_wdev_events(wdev); 1430 1431 if (WARN_ON(wdev->current_bss)) { 1432 cfg80211_unhold_bss(wdev->current_bss); 1433 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 1434 wdev->current_bss = NULL; 1435 } 1436 break; 1437 case NETDEV_PRE_UP: 1438 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype, 1439 wdev->use_4addr, 0)) 1440 return notifier_from_errno(-EOPNOTSUPP); 1441 1442 if (rfkill_blocked(rdev->rfkill)) 1443 return notifier_from_errno(-ERFKILL); 1444 break; 1445 default: 1446 return NOTIFY_DONE; 1447 } 1448 1449 wireless_nlevent_flush(); 1450 1451 return NOTIFY_OK; 1452 } 1453 1454 static struct notifier_block cfg80211_netdev_notifier = { 1455 .notifier_call = cfg80211_netdev_notifier_call, 1456 }; 1457 1458 static void __net_exit cfg80211_pernet_exit(struct net *net) 1459 { 1460 struct cfg80211_registered_device *rdev; 1461 1462 rtnl_lock(); 1463 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1464 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1465 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1466 } 1467 rtnl_unlock(); 1468 } 1469 1470 static struct pernet_operations cfg80211_pernet_ops = { 1471 .exit = cfg80211_pernet_exit, 1472 }; 1473 1474 static int __init cfg80211_init(void) 1475 { 1476 int err; 1477 1478 err = register_pernet_device(&cfg80211_pernet_ops); 1479 if (err) 1480 goto out_fail_pernet; 1481 1482 err = wiphy_sysfs_init(); 1483 if (err) 1484 goto out_fail_sysfs; 1485 1486 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1487 if (err) 1488 goto out_fail_notifier; 1489 1490 err = nl80211_init(); 1491 if (err) 1492 goto out_fail_nl80211; 1493 1494 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1495 1496 err = regulatory_init(); 1497 if (err) 1498 goto out_fail_reg; 1499 1500 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM); 1501 if (!cfg80211_wq) { 1502 err = -ENOMEM; 1503 goto out_fail_wq; 1504 } 1505 1506 return 0; 1507 1508 out_fail_wq: 1509 regulatory_exit(); 1510 out_fail_reg: 1511 debugfs_remove(ieee80211_debugfs_dir); 1512 nl80211_exit(); 1513 out_fail_nl80211: 1514 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1515 out_fail_notifier: 1516 wiphy_sysfs_exit(); 1517 out_fail_sysfs: 1518 unregister_pernet_device(&cfg80211_pernet_ops); 1519 out_fail_pernet: 1520 return err; 1521 } 1522 fs_initcall(cfg80211_init); 1523 1524 static void __exit cfg80211_exit(void) 1525 { 1526 debugfs_remove(ieee80211_debugfs_dir); 1527 nl80211_exit(); 1528 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1529 wiphy_sysfs_exit(); 1530 regulatory_exit(); 1531 unregister_pernet_device(&cfg80211_pernet_ops); 1532 destroy_workqueue(cfg80211_wq); 1533 } 1534 module_exit(cfg80211_exit); 1535