1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * This is the linux wireless configuration interface. 4 * 5 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net> 6 * Copyright 2013-2014 Intel Mobile Communications GmbH 7 * Copyright 2015-2017 Intel Deutschland GmbH 8 * Copyright (C) 2018-2020 Intel Corporation 9 */ 10 11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 12 13 #include <linux/if.h> 14 #include <linux/module.h> 15 #include <linux/err.h> 16 #include <linux/list.h> 17 #include <linux/slab.h> 18 #include <linux/nl80211.h> 19 #include <linux/debugfs.h> 20 #include <linux/notifier.h> 21 #include <linux/device.h> 22 #include <linux/etherdevice.h> 23 #include <linux/rtnetlink.h> 24 #include <linux/sched.h> 25 #include <net/genetlink.h> 26 #include <net/cfg80211.h> 27 #include "nl80211.h" 28 #include "core.h" 29 #include "sysfs.h" 30 #include "debugfs.h" 31 #include "wext-compat.h" 32 #include "rdev-ops.h" 33 34 /* name for sysfs, %d is appended */ 35 #define PHY_NAME "phy" 36 37 MODULE_AUTHOR("Johannes Berg"); 38 MODULE_LICENSE("GPL"); 39 MODULE_DESCRIPTION("wireless configuration support"); 40 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME); 41 42 /* RCU-protected (and RTNL for writers) */ 43 LIST_HEAD(cfg80211_rdev_list); 44 int cfg80211_rdev_list_generation; 45 46 /* for debugfs */ 47 static struct dentry *ieee80211_debugfs_dir; 48 49 /* for the cleanup, scan and event works */ 50 struct workqueue_struct *cfg80211_wq; 51 52 static bool cfg80211_disable_40mhz_24ghz; 53 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644); 54 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz, 55 "Disable 40MHz support in the 2.4GHz band"); 56 57 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx) 58 { 59 struct cfg80211_registered_device *result = NULL, *rdev; 60 61 ASSERT_RTNL(); 62 63 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 64 if (rdev->wiphy_idx == wiphy_idx) { 65 result = rdev; 66 break; 67 } 68 } 69 70 return result; 71 } 72 73 int get_wiphy_idx(struct wiphy *wiphy) 74 { 75 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 76 77 return rdev->wiphy_idx; 78 } 79 80 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx) 81 { 82 struct cfg80211_registered_device *rdev; 83 84 ASSERT_RTNL(); 85 86 rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx); 87 if (!rdev) 88 return NULL; 89 return &rdev->wiphy; 90 } 91 92 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev, 93 const char *newname) 94 { 95 struct cfg80211_registered_device *rdev2; 96 int wiphy_idx, taken = -1, digits; 97 98 ASSERT_RTNL(); 99 100 if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN) 101 return -EINVAL; 102 103 /* prohibit calling the thing phy%d when %d is not its number */ 104 sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken); 105 if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) { 106 /* count number of places needed to print wiphy_idx */ 107 digits = 1; 108 while (wiphy_idx /= 10) 109 digits++; 110 /* 111 * deny the name if it is phy<idx> where <idx> is printed 112 * without leading zeroes. taken == strlen(newname) here 113 */ 114 if (taken == strlen(PHY_NAME) + digits) 115 return -EINVAL; 116 } 117 118 /* Ensure another device does not already have this name. */ 119 list_for_each_entry(rdev2, &cfg80211_rdev_list, list) 120 if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0) 121 return -EINVAL; 122 123 return 0; 124 } 125 126 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, 127 char *newname) 128 { 129 int result; 130 131 ASSERT_RTNL(); 132 133 /* Ignore nop renames */ 134 if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0) 135 return 0; 136 137 result = cfg80211_dev_check_name(rdev, newname); 138 if (result < 0) 139 return result; 140 141 result = device_rename(&rdev->wiphy.dev, newname); 142 if (result) 143 return result; 144 145 if (!IS_ERR_OR_NULL(rdev->wiphy.debugfsdir)) 146 debugfs_rename(rdev->wiphy.debugfsdir->d_parent, 147 rdev->wiphy.debugfsdir, 148 rdev->wiphy.debugfsdir->d_parent, newname); 149 150 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 151 152 return 0; 153 } 154 155 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, 156 struct net *net) 157 { 158 struct wireless_dev *wdev; 159 int err = 0; 160 161 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK)) 162 return -EOPNOTSUPP; 163 164 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 165 if (!wdev->netdev) 166 continue; 167 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 168 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); 169 if (err) 170 break; 171 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 172 } 173 174 if (err) { 175 /* failed -- clean up to old netns */ 176 net = wiphy_net(&rdev->wiphy); 177 178 list_for_each_entry_continue_reverse(wdev, 179 &rdev->wiphy.wdev_list, 180 list) { 181 if (!wdev->netdev) 182 continue; 183 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 184 err = dev_change_net_namespace(wdev->netdev, net, 185 "wlan%d"); 186 WARN_ON(err); 187 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 188 } 189 190 return err; 191 } 192 193 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 194 if (!wdev->netdev) 195 continue; 196 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 197 } 198 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 199 200 wiphy_net_set(&rdev->wiphy, net); 201 202 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev)); 203 WARN_ON(err); 204 205 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 206 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 207 if (!wdev->netdev) 208 continue; 209 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 210 } 211 212 return 0; 213 } 214 215 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data) 216 { 217 struct cfg80211_registered_device *rdev = data; 218 219 rdev_rfkill_poll(rdev); 220 } 221 222 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev, 223 struct wireless_dev *wdev) 224 { 225 ASSERT_RTNL(); 226 227 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE)) 228 return; 229 230 if (!wdev_running(wdev)) 231 return; 232 233 rdev_stop_p2p_device(rdev, wdev); 234 wdev->is_running = false; 235 236 rdev->opencount--; 237 238 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 239 if (WARN_ON(!rdev->scan_req->notified)) 240 rdev->scan_req->info.aborted = true; 241 ___cfg80211_scan_done(rdev, false); 242 } 243 } 244 245 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev, 246 struct wireless_dev *wdev) 247 { 248 ASSERT_RTNL(); 249 250 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN)) 251 return; 252 253 if (!wdev_running(wdev)) 254 return; 255 256 rdev_stop_nan(rdev, wdev); 257 wdev->is_running = false; 258 259 rdev->opencount--; 260 } 261 262 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy) 263 { 264 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 265 struct wireless_dev *wdev; 266 267 ASSERT_RTNL(); 268 269 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 270 if (wdev->netdev) { 271 dev_close(wdev->netdev); 272 continue; 273 } 274 /* otherwise, check iftype */ 275 switch (wdev->iftype) { 276 case NL80211_IFTYPE_P2P_DEVICE: 277 cfg80211_stop_p2p_device(rdev, wdev); 278 break; 279 case NL80211_IFTYPE_NAN: 280 cfg80211_stop_nan(rdev, wdev); 281 break; 282 default: 283 break; 284 } 285 } 286 } 287 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces); 288 289 static int cfg80211_rfkill_set_block(void *data, bool blocked) 290 { 291 struct cfg80211_registered_device *rdev = data; 292 293 if (!blocked) 294 return 0; 295 296 rtnl_lock(); 297 cfg80211_shutdown_all_interfaces(&rdev->wiphy); 298 rtnl_unlock(); 299 300 return 0; 301 } 302 303 static void cfg80211_rfkill_block_work(struct work_struct *work) 304 { 305 struct cfg80211_registered_device *rdev; 306 307 rdev = container_of(work, struct cfg80211_registered_device, 308 rfkill_block); 309 cfg80211_rfkill_set_block(rdev, true); 310 } 311 312 static void cfg80211_event_work(struct work_struct *work) 313 { 314 struct cfg80211_registered_device *rdev; 315 316 rdev = container_of(work, struct cfg80211_registered_device, 317 event_work); 318 319 rtnl_lock(); 320 cfg80211_process_rdev_events(rdev); 321 rtnl_unlock(); 322 } 323 324 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev) 325 { 326 struct wireless_dev *wdev, *tmp; 327 328 ASSERT_RTNL(); 329 330 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) { 331 if (wdev->nl_owner_dead) 332 rdev_del_virtual_intf(rdev, wdev); 333 } 334 } 335 336 static void cfg80211_destroy_iface_wk(struct work_struct *work) 337 { 338 struct cfg80211_registered_device *rdev; 339 340 rdev = container_of(work, struct cfg80211_registered_device, 341 destroy_work); 342 343 rtnl_lock(); 344 cfg80211_destroy_ifaces(rdev); 345 rtnl_unlock(); 346 } 347 348 static void cfg80211_sched_scan_stop_wk(struct work_struct *work) 349 { 350 struct cfg80211_registered_device *rdev; 351 struct cfg80211_sched_scan_request *req, *tmp; 352 353 rdev = container_of(work, struct cfg80211_registered_device, 354 sched_scan_stop_wk); 355 356 rtnl_lock(); 357 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { 358 if (req->nl_owner_dead) 359 cfg80211_stop_sched_scan_req(rdev, req, false); 360 } 361 rtnl_unlock(); 362 } 363 364 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work) 365 { 366 struct cfg80211_registered_device *rdev; 367 368 rdev = container_of(work, struct cfg80211_registered_device, 369 propagate_radar_detect_wk); 370 371 rtnl_lock(); 372 373 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef, 374 NL80211_DFS_UNAVAILABLE, 375 NL80211_RADAR_DETECTED); 376 377 rtnl_unlock(); 378 } 379 380 static void cfg80211_propagate_cac_done_wk(struct work_struct *work) 381 { 382 struct cfg80211_registered_device *rdev; 383 384 rdev = container_of(work, struct cfg80211_registered_device, 385 propagate_cac_done_wk); 386 387 rtnl_lock(); 388 389 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef, 390 NL80211_DFS_AVAILABLE, 391 NL80211_RADAR_CAC_FINISHED); 392 393 rtnl_unlock(); 394 } 395 396 /* exported functions */ 397 398 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, 399 const char *requested_name) 400 { 401 static atomic_t wiphy_counter = ATOMIC_INIT(0); 402 403 struct cfg80211_registered_device *rdev; 404 int alloc_size; 405 406 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 407 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 408 WARN_ON(ops->connect && !ops->disconnect); 409 WARN_ON(ops->join_ibss && !ops->leave_ibss); 410 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 411 WARN_ON(ops->add_station && !ops->del_station); 412 WARN_ON(ops->add_mpath && !ops->del_mpath); 413 WARN_ON(ops->join_mesh && !ops->leave_mesh); 414 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device); 415 WARN_ON(ops->start_ap && !ops->stop_ap); 416 WARN_ON(ops->join_ocb && !ops->leave_ocb); 417 WARN_ON(ops->suspend && !ops->resume); 418 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop); 419 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel); 420 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch); 421 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts); 422 423 alloc_size = sizeof(*rdev) + sizeof_priv; 424 425 rdev = kzalloc(alloc_size, GFP_KERNEL); 426 if (!rdev) 427 return NULL; 428 429 rdev->ops = ops; 430 431 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 432 433 if (unlikely(rdev->wiphy_idx < 0)) { 434 /* ugh, wrapped! */ 435 atomic_dec(&wiphy_counter); 436 kfree(rdev); 437 return NULL; 438 } 439 440 /* atomic_inc_return makes it start at 1, make it start at 0 */ 441 rdev->wiphy_idx--; 442 443 /* give it a proper name */ 444 if (requested_name && requested_name[0]) { 445 int rv; 446 447 rtnl_lock(); 448 rv = cfg80211_dev_check_name(rdev, requested_name); 449 450 if (rv < 0) { 451 rtnl_unlock(); 452 goto use_default_name; 453 } 454 455 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); 456 rtnl_unlock(); 457 if (rv) 458 goto use_default_name; 459 } else { 460 int rv; 461 462 use_default_name: 463 /* NOTE: This is *probably* safe w/out holding rtnl because of 464 * the restrictions on phy names. Probably this call could 465 * fail if some other part of the kernel (re)named a device 466 * phyX. But, might should add some locking and check return 467 * value, and use a different name if this one exists? 468 */ 469 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 470 if (rv < 0) { 471 kfree(rdev); 472 return NULL; 473 } 474 } 475 476 INIT_LIST_HEAD(&rdev->wiphy.wdev_list); 477 INIT_LIST_HEAD(&rdev->beacon_registrations); 478 spin_lock_init(&rdev->beacon_registrations_lock); 479 spin_lock_init(&rdev->bss_lock); 480 INIT_LIST_HEAD(&rdev->bss_list); 481 INIT_LIST_HEAD(&rdev->sched_scan_req_list); 482 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 483 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 484 cfg80211_dfs_channels_update_work); 485 #ifdef CONFIG_CFG80211_WEXT 486 rdev->wiphy.wext = &cfg80211_wext_handler; 487 #endif 488 489 device_initialize(&rdev->wiphy.dev); 490 rdev->wiphy.dev.class = &ieee80211_class; 491 rdev->wiphy.dev.platform_data = rdev; 492 device_enable_async_suspend(&rdev->wiphy.dev); 493 494 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 495 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 496 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk); 497 INIT_WORK(&rdev->propagate_radar_detect_wk, 498 cfg80211_propagate_radar_detect_wk); 499 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk); 500 INIT_WORK(&rdev->mgmt_registrations_update_wk, 501 cfg80211_mgmt_registrations_update_wk); 502 503 #ifdef CONFIG_CFG80211_DEFAULT_PS 504 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 505 #endif 506 507 wiphy_net_set(&rdev->wiphy, &init_net); 508 509 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 510 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 511 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 512 &rdev->rfkill_ops, rdev); 513 514 if (!rdev->rfkill) { 515 wiphy_free(&rdev->wiphy); 516 return NULL; 517 } 518 519 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work); 520 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 521 INIT_WORK(&rdev->event_work, cfg80211_event_work); 522 523 init_waitqueue_head(&rdev->dev_wait); 524 525 /* 526 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 527 * Fragmentation and RTS threshold are disabled by default with the 528 * special -1 value. 529 */ 530 rdev->wiphy.retry_short = 7; 531 rdev->wiphy.retry_long = 4; 532 rdev->wiphy.frag_threshold = (u32) -1; 533 rdev->wiphy.rts_threshold = (u32) -1; 534 rdev->wiphy.coverage_class = 0; 535 536 rdev->wiphy.max_num_csa_counters = 1; 537 538 rdev->wiphy.max_sched_scan_plans = 1; 539 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 540 541 return &rdev->wiphy; 542 } 543 EXPORT_SYMBOL(wiphy_new_nm); 544 545 static int wiphy_verify_combinations(struct wiphy *wiphy) 546 { 547 const struct ieee80211_iface_combination *c; 548 int i, j; 549 550 for (i = 0; i < wiphy->n_iface_combinations; i++) { 551 u32 cnt = 0; 552 u16 all_iftypes = 0; 553 554 c = &wiphy->iface_combinations[i]; 555 556 /* 557 * Combinations with just one interface aren't real, 558 * however we make an exception for DFS. 559 */ 560 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 561 return -EINVAL; 562 563 /* Need at least one channel */ 564 if (WARN_ON(!c->num_different_channels)) 565 return -EINVAL; 566 567 /* 568 * Put a sane limit on maximum number of different 569 * channels to simplify channel accounting code. 570 */ 571 if (WARN_ON(c->num_different_channels > 572 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 573 return -EINVAL; 574 575 /* DFS only works on one channel. */ 576 if (WARN_ON(c->radar_detect_widths && 577 (c->num_different_channels > 1))) 578 return -EINVAL; 579 580 if (WARN_ON(!c->n_limits)) 581 return -EINVAL; 582 583 for (j = 0; j < c->n_limits; j++) { 584 u16 types = c->limits[j].types; 585 586 /* interface types shouldn't overlap */ 587 if (WARN_ON(types & all_iftypes)) 588 return -EINVAL; 589 all_iftypes |= types; 590 591 if (WARN_ON(!c->limits[j].max)) 592 return -EINVAL; 593 594 /* Shouldn't list software iftypes in combinations! */ 595 if (WARN_ON(wiphy->software_iftypes & types)) 596 return -EINVAL; 597 598 /* Only a single P2P_DEVICE can be allowed */ 599 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 600 c->limits[j].max > 1)) 601 return -EINVAL; 602 603 /* Only a single NAN can be allowed */ 604 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) && 605 c->limits[j].max > 1)) 606 return -EINVAL; 607 608 /* 609 * This isn't well-defined right now. If you have an 610 * IBSS interface, then its beacon interval may change 611 * by joining other networks, and nothing prevents it 612 * from doing that. 613 * So technically we probably shouldn't even allow AP 614 * and IBSS in the same interface, but it seems that 615 * some drivers support that, possibly only with fixed 616 * beacon intervals for IBSS. 617 */ 618 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) && 619 c->beacon_int_min_gcd)) { 620 return -EINVAL; 621 } 622 623 cnt += c->limits[j].max; 624 /* 625 * Don't advertise an unsupported type 626 * in a combination. 627 */ 628 if (WARN_ON((wiphy->interface_modes & types) != types)) 629 return -EINVAL; 630 } 631 632 #ifndef CONFIG_WIRELESS_WDS 633 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS))) 634 return -EINVAL; 635 #endif 636 637 /* You can't even choose that many! */ 638 if (WARN_ON(cnt < c->max_interfaces)) 639 return -EINVAL; 640 } 641 642 return 0; 643 } 644 645 int wiphy_register(struct wiphy *wiphy) 646 { 647 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 648 int res; 649 enum nl80211_band band; 650 struct ieee80211_supported_band *sband; 651 bool have_band = false; 652 int i; 653 u16 ifmodes = wiphy->interface_modes; 654 655 #ifdef CONFIG_PM 656 if (WARN_ON(wiphy->wowlan && 657 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 658 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 659 return -EINVAL; 660 if (WARN_ON(wiphy->wowlan && 661 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 662 !wiphy->wowlan->tcp)) 663 return -EINVAL; 664 #endif 665 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 666 (!rdev->ops->tdls_channel_switch || 667 !rdev->ops->tdls_cancel_channel_switch))) 668 return -EINVAL; 669 670 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) && 671 (!rdev->ops->start_nan || !rdev->ops->stop_nan || 672 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func || 673 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ))))) 674 return -EINVAL; 675 676 #ifndef CONFIG_WIRELESS_WDS 677 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))) 678 return -EINVAL; 679 #endif 680 681 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported)) 682 return -EINVAL; 683 684 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) { 685 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap && 686 !wiphy->pmsr_capa->ftm.non_asap)) 687 return -EINVAL; 688 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles || 689 !wiphy->pmsr_capa->ftm.bandwidths)) 690 return -EINVAL; 691 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles & 692 ~(BIT(NL80211_PREAMBLE_LEGACY) | 693 BIT(NL80211_PREAMBLE_HT) | 694 BIT(NL80211_PREAMBLE_VHT) | 695 BIT(NL80211_PREAMBLE_HE) | 696 BIT(NL80211_PREAMBLE_DMG)))) 697 return -EINVAL; 698 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based || 699 wiphy->pmsr_capa->ftm.non_trigger_based) && 700 !(wiphy->pmsr_capa->ftm.preambles & 701 BIT(NL80211_PREAMBLE_HE)))) 702 return -EINVAL; 703 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths & 704 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) | 705 BIT(NL80211_CHAN_WIDTH_20) | 706 BIT(NL80211_CHAN_WIDTH_40) | 707 BIT(NL80211_CHAN_WIDTH_80) | 708 BIT(NL80211_CHAN_WIDTH_80P80) | 709 BIT(NL80211_CHAN_WIDTH_160) | 710 BIT(NL80211_CHAN_WIDTH_5) | 711 BIT(NL80211_CHAN_WIDTH_10)))) 712 return -EINVAL; 713 } 714 715 /* 716 * if a wiphy has unsupported modes for regulatory channel enforcement, 717 * opt-out of enforcement checking 718 */ 719 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) | 720 BIT(NL80211_IFTYPE_P2P_CLIENT) | 721 BIT(NL80211_IFTYPE_AP) | 722 BIT(NL80211_IFTYPE_P2P_GO) | 723 BIT(NL80211_IFTYPE_ADHOC) | 724 BIT(NL80211_IFTYPE_P2P_DEVICE) | 725 BIT(NL80211_IFTYPE_NAN) | 726 BIT(NL80211_IFTYPE_AP_VLAN) | 727 BIT(NL80211_IFTYPE_MONITOR))) 728 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF; 729 730 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 731 (wiphy->regulatory_flags & 732 (REGULATORY_CUSTOM_REG | 733 REGULATORY_STRICT_REG | 734 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 735 REGULATORY_COUNTRY_IE_IGNORE)))) 736 return -EINVAL; 737 738 if (WARN_ON(wiphy->coalesce && 739 (!wiphy->coalesce->n_rules || 740 !wiphy->coalesce->n_patterns) && 741 (!wiphy->coalesce->pattern_min_len || 742 wiphy->coalesce->pattern_min_len > 743 wiphy->coalesce->pattern_max_len))) 744 return -EINVAL; 745 746 if (WARN_ON(wiphy->ap_sme_capa && 747 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 748 return -EINVAL; 749 750 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 751 return -EINVAL; 752 753 if (WARN_ON(wiphy->addresses && 754 !is_zero_ether_addr(wiphy->perm_addr) && 755 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 756 ETH_ALEN))) 757 return -EINVAL; 758 759 if (WARN_ON(wiphy->max_acl_mac_addrs && 760 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 761 !rdev->ops->set_mac_acl))) 762 return -EINVAL; 763 764 /* assure only valid behaviours are flagged by driver 765 * hence subtract 2 as bit 0 is invalid. 766 */ 767 if (WARN_ON(wiphy->bss_select_support && 768 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 769 return -EINVAL; 770 771 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy, 772 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) && 773 (!rdev->ops->set_pmk || !rdev->ops->del_pmk))) 774 return -EINVAL; 775 776 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) && 777 rdev->ops->update_connect_params)) 778 return -EINVAL; 779 780 if (wiphy->addresses) 781 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 782 783 /* sanity check ifmodes */ 784 WARN_ON(!ifmodes); 785 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 786 if (WARN_ON(ifmodes != wiphy->interface_modes)) 787 wiphy->interface_modes = ifmodes; 788 789 res = wiphy_verify_combinations(wiphy); 790 if (res) 791 return res; 792 793 /* sanity check supported bands/channels */ 794 for (band = 0; band < NUM_NL80211_BANDS; band++) { 795 u16 types = 0; 796 bool have_he = false; 797 798 sband = wiphy->bands[band]; 799 if (!sband) 800 continue; 801 802 sband->band = band; 803 if (WARN_ON(!sband->n_channels)) 804 return -EINVAL; 805 /* 806 * on 60GHz band, there are no legacy rates, so 807 * n_bitrates is 0 808 */ 809 if (WARN_ON(band != NL80211_BAND_60GHZ && 810 !sband->n_bitrates)) 811 return -EINVAL; 812 813 if (WARN_ON(band == NL80211_BAND_6GHZ && 814 (sband->ht_cap.ht_supported || 815 sband->vht_cap.vht_supported))) 816 return -EINVAL; 817 818 /* 819 * Since cfg80211_disable_40mhz_24ghz is global, we can 820 * modify the sband's ht data even if the driver uses a 821 * global structure for that. 822 */ 823 if (cfg80211_disable_40mhz_24ghz && 824 band == NL80211_BAND_2GHZ && 825 sband->ht_cap.ht_supported) { 826 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 827 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 828 } 829 830 /* 831 * Since we use a u32 for rate bitmaps in 832 * ieee80211_get_response_rate, we cannot 833 * have more than 32 legacy rates. 834 */ 835 if (WARN_ON(sband->n_bitrates > 32)) 836 return -EINVAL; 837 838 for (i = 0; i < sband->n_channels; i++) { 839 sband->channels[i].orig_flags = 840 sband->channels[i].flags; 841 sband->channels[i].orig_mag = INT_MAX; 842 sband->channels[i].orig_mpwr = 843 sband->channels[i].max_power; 844 sband->channels[i].band = band; 845 846 if (WARN_ON(sband->channels[i].freq_offset >= 1000)) 847 return -EINVAL; 848 } 849 850 for (i = 0; i < sband->n_iftype_data; i++) { 851 const struct ieee80211_sband_iftype_data *iftd; 852 853 iftd = &sband->iftype_data[i]; 854 855 if (WARN_ON(!iftd->types_mask)) 856 return -EINVAL; 857 if (WARN_ON(types & iftd->types_mask)) 858 return -EINVAL; 859 860 /* at least one piece of information must be present */ 861 if (WARN_ON(!iftd->he_cap.has_he)) 862 return -EINVAL; 863 864 types |= iftd->types_mask; 865 866 if (i == 0) 867 have_he = iftd->he_cap.has_he; 868 else 869 have_he = have_he && 870 iftd->he_cap.has_he; 871 } 872 873 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ)) 874 return -EINVAL; 875 876 have_band = true; 877 } 878 879 if (!have_band) { 880 WARN_ON(1); 881 return -EINVAL; 882 } 883 884 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) { 885 /* 886 * Validate we have a policy (can be explicitly set to 887 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that 888 * we have at least one of doit/dumpit. 889 */ 890 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy)) 891 return -EINVAL; 892 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit && 893 !rdev->wiphy.vendor_commands[i].dumpit)) 894 return -EINVAL; 895 } 896 897 #ifdef CONFIG_PM 898 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 899 (!rdev->wiphy.wowlan->pattern_min_len || 900 rdev->wiphy.wowlan->pattern_min_len > 901 rdev->wiphy.wowlan->pattern_max_len))) 902 return -EINVAL; 903 #endif 904 905 /* check and set up bitrates */ 906 ieee80211_set_bitrate_flags(wiphy); 907 908 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 909 910 rtnl_lock(); 911 res = device_add(&rdev->wiphy.dev); 912 if (res) { 913 rtnl_unlock(); 914 return res; 915 } 916 917 /* set up regulatory info */ 918 wiphy_regulatory_register(wiphy); 919 920 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 921 cfg80211_rdev_list_generation++; 922 923 /* add to debugfs */ 924 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy), 925 ieee80211_debugfs_dir); 926 927 cfg80211_debugfs_rdev_add(rdev); 928 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 929 930 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 931 struct regulatory_request request; 932 933 request.wiphy_idx = get_wiphy_idx(wiphy); 934 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 935 request.alpha2[0] = '9'; 936 request.alpha2[1] = '9'; 937 938 nl80211_send_reg_change_event(&request); 939 } 940 941 /* Check that nobody globally advertises any capabilities they do not 942 * advertise on all possible interface types. 943 */ 944 if (wiphy->extended_capabilities_len && 945 wiphy->num_iftype_ext_capab && 946 wiphy->iftype_ext_capab) { 947 u8 supported_on_all, j; 948 const struct wiphy_iftype_ext_capab *capab; 949 950 capab = wiphy->iftype_ext_capab; 951 for (j = 0; j < wiphy->extended_capabilities_len; j++) { 952 if (capab[0].extended_capabilities_len > j) 953 supported_on_all = 954 capab[0].extended_capabilities[j]; 955 else 956 supported_on_all = 0x00; 957 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) { 958 if (j >= capab[i].extended_capabilities_len) { 959 supported_on_all = 0x00; 960 break; 961 } 962 supported_on_all &= 963 capab[i].extended_capabilities[j]; 964 } 965 if (WARN_ON(wiphy->extended_capabilities[j] & 966 ~supported_on_all)) 967 break; 968 } 969 } 970 971 rdev->wiphy.registered = true; 972 rtnl_unlock(); 973 974 res = rfkill_register(rdev->rfkill); 975 if (res) { 976 rfkill_destroy(rdev->rfkill); 977 rdev->rfkill = NULL; 978 wiphy_unregister(&rdev->wiphy); 979 return res; 980 } 981 982 return 0; 983 } 984 EXPORT_SYMBOL(wiphy_register); 985 986 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 987 { 988 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 989 990 if (!rdev->ops->rfkill_poll) 991 return; 992 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 993 rfkill_resume_polling(rdev->rfkill); 994 } 995 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 996 997 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 998 { 999 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1000 1001 rfkill_pause_polling(rdev->rfkill); 1002 } 1003 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 1004 1005 void wiphy_unregister(struct wiphy *wiphy) 1006 { 1007 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1008 1009 wait_event(rdev->dev_wait, ({ 1010 int __count; 1011 rtnl_lock(); 1012 __count = rdev->opencount; 1013 rtnl_unlock(); 1014 __count == 0; })); 1015 1016 if (rdev->rfkill) 1017 rfkill_unregister(rdev->rfkill); 1018 1019 rtnl_lock(); 1020 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 1021 rdev->wiphy.registered = false; 1022 1023 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 1024 1025 /* 1026 * First remove the hardware from everywhere, this makes 1027 * it impossible to find from userspace. 1028 */ 1029 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 1030 list_del_rcu(&rdev->list); 1031 synchronize_rcu(); 1032 1033 /* 1034 * If this device got a regulatory hint tell core its 1035 * free to listen now to a new shiny device regulatory hint 1036 */ 1037 wiphy_regulatory_deregister(wiphy); 1038 1039 cfg80211_rdev_list_generation++; 1040 device_del(&rdev->wiphy.dev); 1041 1042 rtnl_unlock(); 1043 1044 flush_work(&rdev->scan_done_wk); 1045 cancel_work_sync(&rdev->conn_work); 1046 flush_work(&rdev->event_work); 1047 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 1048 flush_work(&rdev->destroy_work); 1049 flush_work(&rdev->sched_scan_stop_wk); 1050 flush_work(&rdev->propagate_radar_detect_wk); 1051 flush_work(&rdev->propagate_cac_done_wk); 1052 flush_work(&rdev->mgmt_registrations_update_wk); 1053 1054 #ifdef CONFIG_PM 1055 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 1056 rdev_set_wakeup(rdev, false); 1057 #endif 1058 cfg80211_rdev_free_wowlan(rdev); 1059 cfg80211_rdev_free_coalesce(rdev); 1060 } 1061 EXPORT_SYMBOL(wiphy_unregister); 1062 1063 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 1064 { 1065 struct cfg80211_internal_bss *scan, *tmp; 1066 struct cfg80211_beacon_registration *reg, *treg; 1067 rfkill_destroy(rdev->rfkill); 1068 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 1069 list_del(®->list); 1070 kfree(reg); 1071 } 1072 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 1073 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 1074 kfree(rdev); 1075 } 1076 1077 void wiphy_free(struct wiphy *wiphy) 1078 { 1079 put_device(&wiphy->dev); 1080 } 1081 EXPORT_SYMBOL(wiphy_free); 1082 1083 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 1084 { 1085 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1086 1087 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 1088 schedule_work(&rdev->rfkill_block); 1089 } 1090 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 1091 1092 void cfg80211_cqm_config_free(struct wireless_dev *wdev) 1093 { 1094 kfree(wdev->cqm_config); 1095 wdev->cqm_config = NULL; 1096 } 1097 1098 static void __cfg80211_unregister_wdev(struct wireless_dev *wdev, bool sync) 1099 { 1100 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1101 1102 ASSERT_RTNL(); 1103 1104 flush_work(&wdev->pmsr_free_wk); 1105 1106 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 1107 1108 list_del_rcu(&wdev->list); 1109 if (sync) 1110 synchronize_rcu(); 1111 rdev->devlist_generation++; 1112 1113 cfg80211_mlme_purge_registrations(wdev); 1114 1115 switch (wdev->iftype) { 1116 case NL80211_IFTYPE_P2P_DEVICE: 1117 cfg80211_stop_p2p_device(rdev, wdev); 1118 break; 1119 case NL80211_IFTYPE_NAN: 1120 cfg80211_stop_nan(rdev, wdev); 1121 break; 1122 default: 1123 break; 1124 } 1125 1126 #ifdef CONFIG_CFG80211_WEXT 1127 kzfree(wdev->wext.keys); 1128 wdev->wext.keys = NULL; 1129 #endif 1130 /* only initialized if we have a netdev */ 1131 if (wdev->netdev) 1132 flush_work(&wdev->disconnect_wk); 1133 1134 cfg80211_cqm_config_free(wdev); 1135 } 1136 1137 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 1138 { 1139 if (WARN_ON(wdev->netdev)) 1140 return; 1141 1142 __cfg80211_unregister_wdev(wdev, true); 1143 } 1144 EXPORT_SYMBOL(cfg80211_unregister_wdev); 1145 1146 static const struct device_type wiphy_type = { 1147 .name = "wlan", 1148 }; 1149 1150 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 1151 enum nl80211_iftype iftype, int num) 1152 { 1153 ASSERT_RTNL(); 1154 1155 rdev->num_running_ifaces += num; 1156 if (iftype == NL80211_IFTYPE_MONITOR) 1157 rdev->num_running_monitor_ifaces += num; 1158 } 1159 1160 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 1161 struct wireless_dev *wdev) 1162 { 1163 struct net_device *dev = wdev->netdev; 1164 struct cfg80211_sched_scan_request *pos, *tmp; 1165 1166 ASSERT_RTNL(); 1167 ASSERT_WDEV_LOCK(wdev); 1168 1169 cfg80211_pmsr_wdev_down(wdev); 1170 1171 switch (wdev->iftype) { 1172 case NL80211_IFTYPE_ADHOC: 1173 __cfg80211_leave_ibss(rdev, dev, true); 1174 break; 1175 case NL80211_IFTYPE_P2P_CLIENT: 1176 case NL80211_IFTYPE_STATION: 1177 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, 1178 list) { 1179 if (dev == pos->dev) 1180 cfg80211_stop_sched_scan_req(rdev, pos, false); 1181 } 1182 1183 #ifdef CONFIG_CFG80211_WEXT 1184 kfree(wdev->wext.ie); 1185 wdev->wext.ie = NULL; 1186 wdev->wext.ie_len = 0; 1187 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1188 #endif 1189 cfg80211_disconnect(rdev, dev, 1190 WLAN_REASON_DEAUTH_LEAVING, true); 1191 break; 1192 case NL80211_IFTYPE_MESH_POINT: 1193 __cfg80211_leave_mesh(rdev, dev); 1194 break; 1195 case NL80211_IFTYPE_AP: 1196 case NL80211_IFTYPE_P2P_GO: 1197 __cfg80211_stop_ap(rdev, dev, true); 1198 break; 1199 case NL80211_IFTYPE_OCB: 1200 __cfg80211_leave_ocb(rdev, dev); 1201 break; 1202 case NL80211_IFTYPE_WDS: 1203 /* must be handled by mac80211/driver, has no APIs */ 1204 break; 1205 case NL80211_IFTYPE_P2P_DEVICE: 1206 case NL80211_IFTYPE_NAN: 1207 /* cannot happen, has no netdev */ 1208 break; 1209 case NL80211_IFTYPE_AP_VLAN: 1210 case NL80211_IFTYPE_MONITOR: 1211 /* nothing to do */ 1212 break; 1213 case NL80211_IFTYPE_UNSPECIFIED: 1214 case NUM_NL80211_IFTYPES: 1215 /* invalid */ 1216 break; 1217 } 1218 } 1219 1220 void cfg80211_leave(struct cfg80211_registered_device *rdev, 1221 struct wireless_dev *wdev) 1222 { 1223 wdev_lock(wdev); 1224 __cfg80211_leave(rdev, wdev); 1225 wdev_unlock(wdev); 1226 } 1227 1228 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 1229 gfp_t gfp) 1230 { 1231 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1232 struct cfg80211_event *ev; 1233 unsigned long flags; 1234 1235 trace_cfg80211_stop_iface(wiphy, wdev); 1236 1237 ev = kzalloc(sizeof(*ev), gfp); 1238 if (!ev) 1239 return; 1240 1241 ev->type = EVENT_STOPPED; 1242 1243 spin_lock_irqsave(&wdev->event_lock, flags); 1244 list_add_tail(&ev->list, &wdev->event_list); 1245 spin_unlock_irqrestore(&wdev->event_lock, flags); 1246 queue_work(cfg80211_wq, &rdev->event_work); 1247 } 1248 EXPORT_SYMBOL(cfg80211_stop_iface); 1249 1250 void cfg80211_init_wdev(struct cfg80211_registered_device *rdev, 1251 struct wireless_dev *wdev) 1252 { 1253 mutex_init(&wdev->mtx); 1254 INIT_LIST_HEAD(&wdev->event_list); 1255 spin_lock_init(&wdev->event_lock); 1256 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1257 spin_lock_init(&wdev->mgmt_registrations_lock); 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