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); 500 501 #ifdef CONFIG_CFG80211_DEFAULT_PS 502 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 503 #endif 504 505 wiphy_net_set(&rdev->wiphy, &init_net); 506 507 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 508 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 509 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 510 &rdev->rfkill_ops, rdev); 511 512 if (!rdev->rfkill) { 513 wiphy_free(&rdev->wiphy); 514 return NULL; 515 } 516 517 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work); 518 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 519 INIT_WORK(&rdev->event_work, cfg80211_event_work); 520 521 init_waitqueue_head(&rdev->dev_wait); 522 523 /* 524 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 525 * Fragmentation and RTS threshold are disabled by default with the 526 * special -1 value. 527 */ 528 rdev->wiphy.retry_short = 7; 529 rdev->wiphy.retry_long = 4; 530 rdev->wiphy.frag_threshold = (u32) -1; 531 rdev->wiphy.rts_threshold = (u32) -1; 532 rdev->wiphy.coverage_class = 0; 533 534 rdev->wiphy.max_num_csa_counters = 1; 535 536 rdev->wiphy.max_sched_scan_plans = 1; 537 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 538 539 return &rdev->wiphy; 540 } 541 EXPORT_SYMBOL(wiphy_new_nm); 542 543 static int wiphy_verify_combinations(struct wiphy *wiphy) 544 { 545 const struct ieee80211_iface_combination *c; 546 int i, j; 547 548 for (i = 0; i < wiphy->n_iface_combinations; i++) { 549 u32 cnt = 0; 550 u16 all_iftypes = 0; 551 552 c = &wiphy->iface_combinations[i]; 553 554 /* 555 * Combinations with just one interface aren't real, 556 * however we make an exception for DFS. 557 */ 558 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 559 return -EINVAL; 560 561 /* Need at least one channel */ 562 if (WARN_ON(!c->num_different_channels)) 563 return -EINVAL; 564 565 /* 566 * Put a sane limit on maximum number of different 567 * channels to simplify channel accounting code. 568 */ 569 if (WARN_ON(c->num_different_channels > 570 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 571 return -EINVAL; 572 573 /* DFS only works on one channel. */ 574 if (WARN_ON(c->radar_detect_widths && 575 (c->num_different_channels > 1))) 576 return -EINVAL; 577 578 if (WARN_ON(!c->n_limits)) 579 return -EINVAL; 580 581 for (j = 0; j < c->n_limits; j++) { 582 u16 types = c->limits[j].types; 583 584 /* interface types shouldn't overlap */ 585 if (WARN_ON(types & all_iftypes)) 586 return -EINVAL; 587 all_iftypes |= types; 588 589 if (WARN_ON(!c->limits[j].max)) 590 return -EINVAL; 591 592 /* Shouldn't list software iftypes in combinations! */ 593 if (WARN_ON(wiphy->software_iftypes & types)) 594 return -EINVAL; 595 596 /* Only a single P2P_DEVICE can be allowed */ 597 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 598 c->limits[j].max > 1)) 599 return -EINVAL; 600 601 /* Only a single NAN can be allowed */ 602 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) && 603 c->limits[j].max > 1)) 604 return -EINVAL; 605 606 /* 607 * This isn't well-defined right now. If you have an 608 * IBSS interface, then its beacon interval may change 609 * by joining other networks, and nothing prevents it 610 * from doing that. 611 * So technically we probably shouldn't even allow AP 612 * and IBSS in the same interface, but it seems that 613 * some drivers support that, possibly only with fixed 614 * beacon intervals for IBSS. 615 */ 616 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) && 617 c->beacon_int_min_gcd)) { 618 return -EINVAL; 619 } 620 621 cnt += c->limits[j].max; 622 /* 623 * Don't advertise an unsupported type 624 * in a combination. 625 */ 626 if (WARN_ON((wiphy->interface_modes & types) != types)) 627 return -EINVAL; 628 } 629 630 #ifndef CONFIG_WIRELESS_WDS 631 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS))) 632 return -EINVAL; 633 #endif 634 635 /* You can't even choose that many! */ 636 if (WARN_ON(cnt < c->max_interfaces)) 637 return -EINVAL; 638 } 639 640 return 0; 641 } 642 643 int wiphy_register(struct wiphy *wiphy) 644 { 645 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 646 int res; 647 enum nl80211_band band; 648 struct ieee80211_supported_band *sband; 649 bool have_band = false; 650 int i; 651 u16 ifmodes = wiphy->interface_modes; 652 653 #ifdef CONFIG_PM 654 if (WARN_ON(wiphy->wowlan && 655 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 656 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 657 return -EINVAL; 658 if (WARN_ON(wiphy->wowlan && 659 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 660 !wiphy->wowlan->tcp)) 661 return -EINVAL; 662 #endif 663 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 664 (!rdev->ops->tdls_channel_switch || 665 !rdev->ops->tdls_cancel_channel_switch))) 666 return -EINVAL; 667 668 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) && 669 (!rdev->ops->start_nan || !rdev->ops->stop_nan || 670 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func || 671 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ))))) 672 return -EINVAL; 673 674 #ifndef CONFIG_WIRELESS_WDS 675 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))) 676 return -EINVAL; 677 #endif 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 band, there are no legacy rates, so 805 * n_bitrates is 0 806 */ 807 if (WARN_ON(band != NL80211_BAND_60GHZ && 808 !sband->n_bitrates)) 809 return -EINVAL; 810 811 if (WARN_ON(band == NL80211_BAND_6GHZ && 812 (sband->ht_cap.ht_supported || 813 sband->vht_cap.vht_supported))) 814 return -EINVAL; 815 816 /* 817 * Since cfg80211_disable_40mhz_24ghz is global, we can 818 * modify the sband's ht data even if the driver uses a 819 * global structure for that. 820 */ 821 if (cfg80211_disable_40mhz_24ghz && 822 band == NL80211_BAND_2GHZ && 823 sband->ht_cap.ht_supported) { 824 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 825 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 826 } 827 828 /* 829 * Since we use a u32 for rate bitmaps in 830 * ieee80211_get_response_rate, we cannot 831 * have more than 32 legacy rates. 832 */ 833 if (WARN_ON(sband->n_bitrates > 32)) 834 return -EINVAL; 835 836 for (i = 0; i < sband->n_channels; i++) { 837 sband->channels[i].orig_flags = 838 sband->channels[i].flags; 839 sband->channels[i].orig_mag = INT_MAX; 840 sband->channels[i].orig_mpwr = 841 sband->channels[i].max_power; 842 sband->channels[i].band = band; 843 844 if (WARN_ON(sband->channels[i].freq_offset >= 1000)) 845 return -EINVAL; 846 } 847 848 for (i = 0; i < sband->n_iftype_data; i++) { 849 const struct ieee80211_sband_iftype_data *iftd; 850 851 iftd = &sband->iftype_data[i]; 852 853 if (WARN_ON(!iftd->types_mask)) 854 return -EINVAL; 855 if (WARN_ON(types & iftd->types_mask)) 856 return -EINVAL; 857 858 /* at least one piece of information must be present */ 859 if (WARN_ON(!iftd->he_cap.has_he)) 860 return -EINVAL; 861 862 types |= iftd->types_mask; 863 864 if (i == 0) 865 have_he = iftd->he_cap.has_he; 866 else 867 have_he = have_he && 868 iftd->he_cap.has_he; 869 } 870 871 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ)) 872 return -EINVAL; 873 874 have_band = true; 875 } 876 877 if (!have_band) { 878 WARN_ON(1); 879 return -EINVAL; 880 } 881 882 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) { 883 /* 884 * Validate we have a policy (can be explicitly set to 885 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that 886 * we have at least one of doit/dumpit. 887 */ 888 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy)) 889 return -EINVAL; 890 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit && 891 !rdev->wiphy.vendor_commands[i].dumpit)) 892 return -EINVAL; 893 } 894 895 #ifdef CONFIG_PM 896 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 897 (!rdev->wiphy.wowlan->pattern_min_len || 898 rdev->wiphy.wowlan->pattern_min_len > 899 rdev->wiphy.wowlan->pattern_max_len))) 900 return -EINVAL; 901 #endif 902 903 /* check and set up bitrates */ 904 ieee80211_set_bitrate_flags(wiphy); 905 906 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 907 908 rtnl_lock(); 909 res = device_add(&rdev->wiphy.dev); 910 if (res) { 911 rtnl_unlock(); 912 return res; 913 } 914 915 /* set up regulatory info */ 916 wiphy_regulatory_register(wiphy); 917 918 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 919 cfg80211_rdev_list_generation++; 920 921 /* add to debugfs */ 922 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy), 923 ieee80211_debugfs_dir); 924 925 cfg80211_debugfs_rdev_add(rdev); 926 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 927 928 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 929 struct regulatory_request request; 930 931 request.wiphy_idx = get_wiphy_idx(wiphy); 932 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 933 request.alpha2[0] = '9'; 934 request.alpha2[1] = '9'; 935 936 nl80211_send_reg_change_event(&request); 937 } 938 939 /* Check that nobody globally advertises any capabilities they do not 940 * advertise on all possible interface types. 941 */ 942 if (wiphy->extended_capabilities_len && 943 wiphy->num_iftype_ext_capab && 944 wiphy->iftype_ext_capab) { 945 u8 supported_on_all, j; 946 const struct wiphy_iftype_ext_capab *capab; 947 948 capab = wiphy->iftype_ext_capab; 949 for (j = 0; j < wiphy->extended_capabilities_len; j++) { 950 if (capab[0].extended_capabilities_len > j) 951 supported_on_all = 952 capab[0].extended_capabilities[j]; 953 else 954 supported_on_all = 0x00; 955 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) { 956 if (j >= capab[i].extended_capabilities_len) { 957 supported_on_all = 0x00; 958 break; 959 } 960 supported_on_all &= 961 capab[i].extended_capabilities[j]; 962 } 963 if (WARN_ON(wiphy->extended_capabilities[j] & 964 ~supported_on_all)) 965 break; 966 } 967 } 968 969 rdev->wiphy.registered = true; 970 rtnl_unlock(); 971 972 res = rfkill_register(rdev->rfkill); 973 if (res) { 974 rfkill_destroy(rdev->rfkill); 975 rdev->rfkill = NULL; 976 wiphy_unregister(&rdev->wiphy); 977 return res; 978 } 979 980 return 0; 981 } 982 EXPORT_SYMBOL(wiphy_register); 983 984 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 985 { 986 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 987 988 if (!rdev->ops->rfkill_poll) 989 return; 990 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 991 rfkill_resume_polling(rdev->rfkill); 992 } 993 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 994 995 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 996 { 997 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 998 999 rfkill_pause_polling(rdev->rfkill); 1000 } 1001 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 1002 1003 void wiphy_unregister(struct wiphy *wiphy) 1004 { 1005 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1006 1007 wait_event(rdev->dev_wait, ({ 1008 int __count; 1009 rtnl_lock(); 1010 __count = rdev->opencount; 1011 rtnl_unlock(); 1012 __count == 0; })); 1013 1014 if (rdev->rfkill) 1015 rfkill_unregister(rdev->rfkill); 1016 1017 rtnl_lock(); 1018 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 1019 rdev->wiphy.registered = false; 1020 1021 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 1022 1023 /* 1024 * First remove the hardware from everywhere, this makes 1025 * it impossible to find from userspace. 1026 */ 1027 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 1028 list_del_rcu(&rdev->list); 1029 synchronize_rcu(); 1030 1031 /* 1032 * If this device got a regulatory hint tell core its 1033 * free to listen now to a new shiny device regulatory hint 1034 */ 1035 wiphy_regulatory_deregister(wiphy); 1036 1037 cfg80211_rdev_list_generation++; 1038 device_del(&rdev->wiphy.dev); 1039 1040 rtnl_unlock(); 1041 1042 flush_work(&rdev->scan_done_wk); 1043 cancel_work_sync(&rdev->conn_work); 1044 flush_work(&rdev->event_work); 1045 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 1046 flush_work(&rdev->destroy_work); 1047 flush_work(&rdev->sched_scan_stop_wk); 1048 flush_work(&rdev->propagate_radar_detect_wk); 1049 flush_work(&rdev->propagate_cac_done_wk); 1050 1051 #ifdef CONFIG_PM 1052 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 1053 rdev_set_wakeup(rdev, false); 1054 #endif 1055 cfg80211_rdev_free_wowlan(rdev); 1056 cfg80211_rdev_free_coalesce(rdev); 1057 } 1058 EXPORT_SYMBOL(wiphy_unregister); 1059 1060 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 1061 { 1062 struct cfg80211_internal_bss *scan, *tmp; 1063 struct cfg80211_beacon_registration *reg, *treg; 1064 rfkill_destroy(rdev->rfkill); 1065 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 1066 list_del(®->list); 1067 kfree(reg); 1068 } 1069 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 1070 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 1071 kfree(rdev); 1072 } 1073 1074 void wiphy_free(struct wiphy *wiphy) 1075 { 1076 put_device(&wiphy->dev); 1077 } 1078 EXPORT_SYMBOL(wiphy_free); 1079 1080 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 1081 { 1082 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1083 1084 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 1085 schedule_work(&rdev->rfkill_block); 1086 } 1087 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 1088 1089 void cfg80211_cqm_config_free(struct wireless_dev *wdev) 1090 { 1091 kfree(wdev->cqm_config); 1092 wdev->cqm_config = NULL; 1093 } 1094 1095 static void __cfg80211_unregister_wdev(struct wireless_dev *wdev, bool sync) 1096 { 1097 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1098 1099 ASSERT_RTNL(); 1100 1101 flush_work(&wdev->pmsr_free_wk); 1102 1103 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 1104 1105 list_del_rcu(&wdev->list); 1106 if (sync) 1107 synchronize_rcu(); 1108 rdev->devlist_generation++; 1109 1110 cfg80211_mlme_purge_registrations(wdev); 1111 flush_work(&wdev->mgmt_registrations_update_wk); 1112 1113 switch (wdev->iftype) { 1114 case NL80211_IFTYPE_P2P_DEVICE: 1115 cfg80211_stop_p2p_device(rdev, wdev); 1116 break; 1117 case NL80211_IFTYPE_NAN: 1118 cfg80211_stop_nan(rdev, wdev); 1119 break; 1120 default: 1121 break; 1122 } 1123 1124 #ifdef CONFIG_CFG80211_WEXT 1125 kzfree(wdev->wext.keys); 1126 wdev->wext.keys = NULL; 1127 #endif 1128 /* only initialized if we have a netdev */ 1129 if (wdev->netdev) 1130 flush_work(&wdev->disconnect_wk); 1131 1132 cfg80211_cqm_config_free(wdev); 1133 } 1134 1135 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 1136 { 1137 if (WARN_ON(wdev->netdev)) 1138 return; 1139 1140 __cfg80211_unregister_wdev(wdev, true); 1141 } 1142 EXPORT_SYMBOL(cfg80211_unregister_wdev); 1143 1144 static const struct device_type wiphy_type = { 1145 .name = "wlan", 1146 }; 1147 1148 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 1149 enum nl80211_iftype iftype, int num) 1150 { 1151 ASSERT_RTNL(); 1152 1153 rdev->num_running_ifaces += num; 1154 if (iftype == NL80211_IFTYPE_MONITOR) 1155 rdev->num_running_monitor_ifaces += num; 1156 } 1157 1158 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 1159 struct wireless_dev *wdev) 1160 { 1161 struct net_device *dev = wdev->netdev; 1162 struct cfg80211_sched_scan_request *pos, *tmp; 1163 1164 ASSERT_RTNL(); 1165 ASSERT_WDEV_LOCK(wdev); 1166 1167 cfg80211_pmsr_wdev_down(wdev); 1168 1169 switch (wdev->iftype) { 1170 case NL80211_IFTYPE_ADHOC: 1171 __cfg80211_leave_ibss(rdev, dev, true); 1172 break; 1173 case NL80211_IFTYPE_P2P_CLIENT: 1174 case NL80211_IFTYPE_STATION: 1175 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, 1176 list) { 1177 if (dev == pos->dev) 1178 cfg80211_stop_sched_scan_req(rdev, pos, false); 1179 } 1180 1181 #ifdef CONFIG_CFG80211_WEXT 1182 kfree(wdev->wext.ie); 1183 wdev->wext.ie = NULL; 1184 wdev->wext.ie_len = 0; 1185 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1186 #endif 1187 cfg80211_disconnect(rdev, dev, 1188 WLAN_REASON_DEAUTH_LEAVING, true); 1189 break; 1190 case NL80211_IFTYPE_MESH_POINT: 1191 __cfg80211_leave_mesh(rdev, dev); 1192 break; 1193 case NL80211_IFTYPE_AP: 1194 case NL80211_IFTYPE_P2P_GO: 1195 __cfg80211_stop_ap(rdev, dev, true); 1196 break; 1197 case NL80211_IFTYPE_OCB: 1198 __cfg80211_leave_ocb(rdev, dev); 1199 break; 1200 case NL80211_IFTYPE_WDS: 1201 /* must be handled by mac80211/driver, has no APIs */ 1202 break; 1203 case NL80211_IFTYPE_P2P_DEVICE: 1204 case NL80211_IFTYPE_NAN: 1205 /* cannot happen, has no netdev */ 1206 break; 1207 case NL80211_IFTYPE_AP_VLAN: 1208 case NL80211_IFTYPE_MONITOR: 1209 /* nothing to do */ 1210 break; 1211 case NL80211_IFTYPE_UNSPECIFIED: 1212 case NUM_NL80211_IFTYPES: 1213 /* invalid */ 1214 break; 1215 } 1216 } 1217 1218 void cfg80211_leave(struct cfg80211_registered_device *rdev, 1219 struct wireless_dev *wdev) 1220 { 1221 wdev_lock(wdev); 1222 __cfg80211_leave(rdev, wdev); 1223 wdev_unlock(wdev); 1224 } 1225 1226 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 1227 gfp_t gfp) 1228 { 1229 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1230 struct cfg80211_event *ev; 1231 unsigned long flags; 1232 1233 trace_cfg80211_stop_iface(wiphy, wdev); 1234 1235 ev = kzalloc(sizeof(*ev), gfp); 1236 if (!ev) 1237 return; 1238 1239 ev->type = EVENT_STOPPED; 1240 1241 spin_lock_irqsave(&wdev->event_lock, flags); 1242 list_add_tail(&ev->list, &wdev->event_list); 1243 spin_unlock_irqrestore(&wdev->event_lock, flags); 1244 queue_work(cfg80211_wq, &rdev->event_work); 1245 } 1246 EXPORT_SYMBOL(cfg80211_stop_iface); 1247 1248 void cfg80211_init_wdev(struct cfg80211_registered_device *rdev, 1249 struct wireless_dev *wdev) 1250 { 1251 mutex_init(&wdev->mtx); 1252 INIT_LIST_HEAD(&wdev->event_list); 1253 spin_lock_init(&wdev->event_lock); 1254 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1255 spin_lock_init(&wdev->mgmt_registrations_lock); 1256 INIT_WORK(&wdev->mgmt_registrations_update_wk, 1257 cfg80211_mgmt_registrations_update_wk); 1258 INIT_LIST_HEAD(&wdev->pmsr_list); 1259 spin_lock_init(&wdev->pmsr_lock); 1260 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk); 1261 1262 /* 1263 * We get here also when the interface changes network namespaces, 1264 * as it's registered into the new one, but we don't want it to 1265 * change ID in that case. Checking if the ID is already assigned 1266 * works, because 0 isn't considered a valid ID and the memory is 1267 * 0-initialized. 1268 */ 1269 if (!wdev->identifier) 1270 wdev->identifier = ++rdev->wdev_id; 1271 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list); 1272 rdev->devlist_generation++; 1273 1274 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 1275 } 1276 1277 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 1278 unsigned long state, void *ptr) 1279 { 1280 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1281 struct wireless_dev *wdev = dev->ieee80211_ptr; 1282 struct cfg80211_registered_device *rdev; 1283 struct cfg80211_sched_scan_request *pos, *tmp; 1284 1285 if (!wdev) 1286 return NOTIFY_DONE; 1287 1288 rdev = wiphy_to_rdev(wdev->wiphy); 1289 1290 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 1291 1292 switch (state) { 1293 case NETDEV_POST_INIT: 1294 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 1295 break; 1296 case NETDEV_REGISTER: 1297 /* 1298 * NB: cannot take rdev->mtx here because this may be 1299 * called within code protected by it when interfaces 1300 * are added with nl80211. 1301 */ 1302 /* can only change netns with wiphy */ 1303 dev->features |= NETIF_F_NETNS_LOCAL; 1304 1305 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 1306 "phy80211")) { 1307 pr_err("failed to add phy80211 symlink to netdev!\n"); 1308 } 1309 wdev->netdev = dev; 1310 #ifdef CONFIG_CFG80211_WEXT 1311 wdev->wext.default_key = -1; 1312 wdev->wext.default_mgmt_key = -1; 1313 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1314 #endif 1315 1316 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1317 wdev->ps = true; 1318 else 1319 wdev->ps = false; 1320 /* allow mac80211 to determine the timeout */ 1321 wdev->ps_timeout = -1; 1322 1323 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1324 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1325 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1326 dev->priv_flags |= IFF_DONT_BRIDGE; 1327 1328 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk); 1329 1330 cfg80211_init_wdev(rdev, wdev); 1331 break; 1332 case NETDEV_GOING_DOWN: 1333 cfg80211_leave(rdev, wdev); 1334 break; 1335 case NETDEV_DOWN: 1336 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1337 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1338 if (WARN_ON(!rdev->scan_req->notified)) 1339 rdev->scan_req->info.aborted = true; 1340 ___cfg80211_scan_done(rdev, false); 1341 } 1342 1343 list_for_each_entry_safe(pos, tmp, 1344 &rdev->sched_scan_req_list, list) { 1345 if (WARN_ON(pos->dev == wdev->netdev)) 1346 cfg80211_stop_sched_scan_req(rdev, pos, false); 1347 } 1348 1349 rdev->opencount--; 1350 wake_up(&rdev->dev_wait); 1351 break; 1352 case NETDEV_UP: 1353 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1354 wdev_lock(wdev); 1355 switch (wdev->iftype) { 1356 #ifdef CONFIG_CFG80211_WEXT 1357 case NL80211_IFTYPE_ADHOC: 1358 cfg80211_ibss_wext_join(rdev, wdev); 1359 break; 1360 case NL80211_IFTYPE_STATION: 1361 cfg80211_mgd_wext_connect(rdev, wdev); 1362 break; 1363 #endif 1364 #ifdef CONFIG_MAC80211_MESH 1365 case NL80211_IFTYPE_MESH_POINT: 1366 { 1367 /* backward compat code... */ 1368 struct mesh_setup setup; 1369 memcpy(&setup, &default_mesh_setup, 1370 sizeof(setup)); 1371 /* back compat only needed for mesh_id */ 1372 setup.mesh_id = wdev->ssid; 1373 setup.mesh_id_len = wdev->mesh_id_up_len; 1374 if (wdev->mesh_id_up_len) 1375 __cfg80211_join_mesh(rdev, dev, 1376 &setup, 1377 &default_mesh_config); 1378 break; 1379 } 1380 #endif 1381 default: 1382 break; 1383 } 1384 wdev_unlock(wdev); 1385 rdev->opencount++; 1386 1387 /* 1388 * Configure power management to the driver here so that its 1389 * correctly set also after interface type changes etc. 1390 */ 1391 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1392 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1393 rdev->ops->set_power_mgmt && 1394 rdev_set_power_mgmt(rdev, dev, wdev->ps, 1395 wdev->ps_timeout)) { 1396 /* assume this means it's off */ 1397 wdev->ps = false; 1398 } 1399 break; 1400 case NETDEV_UNREGISTER: 1401 /* 1402 * It is possible to get NETDEV_UNREGISTER 1403 * multiple times. To detect that, check 1404 * that the interface is still on the list 1405 * of registered interfaces, and only then 1406 * remove and clean it up. 1407 */ 1408 if (!list_empty(&wdev->list)) { 1409 __cfg80211_unregister_wdev(wdev, false); 1410 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 1411 } 1412 /* 1413 * synchronise (so that we won't find this netdev 1414 * from other code any more) and then clear the list 1415 * head so that the above code can safely check for 1416 * !list_empty() to avoid double-cleanup. 1417 */ 1418 synchronize_rcu(); 1419 INIT_LIST_HEAD(&wdev->list); 1420 /* 1421 * Ensure that all events have been processed and 1422 * freed. 1423 */ 1424 cfg80211_process_wdev_events(wdev); 1425 1426 if (WARN_ON(wdev->current_bss)) { 1427 cfg80211_unhold_bss(wdev->current_bss); 1428 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 1429 wdev->current_bss = NULL; 1430 } 1431 break; 1432 case NETDEV_PRE_UP: 1433 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype, 1434 wdev->use_4addr, 0)) 1435 return notifier_from_errno(-EOPNOTSUPP); 1436 1437 if (rfkill_blocked(rdev->rfkill)) 1438 return notifier_from_errno(-ERFKILL); 1439 break; 1440 default: 1441 return NOTIFY_DONE; 1442 } 1443 1444 wireless_nlevent_flush(); 1445 1446 return NOTIFY_OK; 1447 } 1448 1449 static struct notifier_block cfg80211_netdev_notifier = { 1450 .notifier_call = cfg80211_netdev_notifier_call, 1451 }; 1452 1453 static void __net_exit cfg80211_pernet_exit(struct net *net) 1454 { 1455 struct cfg80211_registered_device *rdev; 1456 1457 rtnl_lock(); 1458 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1459 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1460 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1461 } 1462 rtnl_unlock(); 1463 } 1464 1465 static struct pernet_operations cfg80211_pernet_ops = { 1466 .exit = cfg80211_pernet_exit, 1467 }; 1468 1469 static int __init cfg80211_init(void) 1470 { 1471 int err; 1472 1473 err = register_pernet_device(&cfg80211_pernet_ops); 1474 if (err) 1475 goto out_fail_pernet; 1476 1477 err = wiphy_sysfs_init(); 1478 if (err) 1479 goto out_fail_sysfs; 1480 1481 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1482 if (err) 1483 goto out_fail_notifier; 1484 1485 err = nl80211_init(); 1486 if (err) 1487 goto out_fail_nl80211; 1488 1489 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1490 1491 err = regulatory_init(); 1492 if (err) 1493 goto out_fail_reg; 1494 1495 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM); 1496 if (!cfg80211_wq) { 1497 err = -ENOMEM; 1498 goto out_fail_wq; 1499 } 1500 1501 return 0; 1502 1503 out_fail_wq: 1504 regulatory_exit(); 1505 out_fail_reg: 1506 debugfs_remove(ieee80211_debugfs_dir); 1507 nl80211_exit(); 1508 out_fail_nl80211: 1509 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1510 out_fail_notifier: 1511 wiphy_sysfs_exit(); 1512 out_fail_sysfs: 1513 unregister_pernet_device(&cfg80211_pernet_ops); 1514 out_fail_pernet: 1515 return err; 1516 } 1517 fs_initcall(cfg80211_init); 1518 1519 static void __exit cfg80211_exit(void) 1520 { 1521 debugfs_remove(ieee80211_debugfs_dir); 1522 nl80211_exit(); 1523 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1524 wiphy_sysfs_exit(); 1525 regulatory_exit(); 1526 unregister_pernet_device(&cfg80211_pernet_ops); 1527 destroy_workqueue(cfg80211_wq); 1528 } 1529 module_exit(cfg80211_exit); 1530