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 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 (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_sync_work(struct work_struct *work) 304 { 305 struct cfg80211_registered_device *rdev; 306 307 rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync); 308 cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill)); 309 } 310 311 static void cfg80211_event_work(struct work_struct *work) 312 { 313 struct cfg80211_registered_device *rdev; 314 315 rdev = container_of(work, struct cfg80211_registered_device, 316 event_work); 317 318 rtnl_lock(); 319 cfg80211_process_rdev_events(rdev); 320 rtnl_unlock(); 321 } 322 323 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev) 324 { 325 struct wireless_dev *wdev, *tmp; 326 327 ASSERT_RTNL(); 328 329 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) { 330 if (wdev->nl_owner_dead) 331 rdev_del_virtual_intf(rdev, wdev); 332 } 333 } 334 335 static void cfg80211_destroy_iface_wk(struct work_struct *work) 336 { 337 struct cfg80211_registered_device *rdev; 338 339 rdev = container_of(work, struct cfg80211_registered_device, 340 destroy_work); 341 342 rtnl_lock(); 343 cfg80211_destroy_ifaces(rdev); 344 rtnl_unlock(); 345 } 346 347 static void cfg80211_sched_scan_stop_wk(struct work_struct *work) 348 { 349 struct cfg80211_registered_device *rdev; 350 struct cfg80211_sched_scan_request *req, *tmp; 351 352 rdev = container_of(work, struct cfg80211_registered_device, 353 sched_scan_stop_wk); 354 355 rtnl_lock(); 356 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { 357 if (req->nl_owner_dead) 358 cfg80211_stop_sched_scan_req(rdev, req, false); 359 } 360 rtnl_unlock(); 361 } 362 363 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work) 364 { 365 struct cfg80211_registered_device *rdev; 366 367 rdev = container_of(work, struct cfg80211_registered_device, 368 propagate_radar_detect_wk); 369 370 rtnl_lock(); 371 372 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef, 373 NL80211_DFS_UNAVAILABLE, 374 NL80211_RADAR_DETECTED); 375 376 rtnl_unlock(); 377 } 378 379 static void cfg80211_propagate_cac_done_wk(struct work_struct *work) 380 { 381 struct cfg80211_registered_device *rdev; 382 383 rdev = container_of(work, struct cfg80211_registered_device, 384 propagate_cac_done_wk); 385 386 rtnl_lock(); 387 388 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef, 389 NL80211_DFS_AVAILABLE, 390 NL80211_RADAR_CAC_FINISHED); 391 392 rtnl_unlock(); 393 } 394 395 /* exported functions */ 396 397 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, 398 const char *requested_name) 399 { 400 static atomic_t wiphy_counter = ATOMIC_INIT(0); 401 402 struct cfg80211_registered_device *rdev; 403 int alloc_size; 404 405 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 406 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 407 WARN_ON(ops->connect && !ops->disconnect); 408 WARN_ON(ops->join_ibss && !ops->leave_ibss); 409 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 410 WARN_ON(ops->add_station && !ops->del_station); 411 WARN_ON(ops->add_mpath && !ops->del_mpath); 412 WARN_ON(ops->join_mesh && !ops->leave_mesh); 413 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device); 414 WARN_ON(ops->start_ap && !ops->stop_ap); 415 WARN_ON(ops->join_ocb && !ops->leave_ocb); 416 WARN_ON(ops->suspend && !ops->resume); 417 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop); 418 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel); 419 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch); 420 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts); 421 422 alloc_size = sizeof(*rdev) + sizeof_priv; 423 424 rdev = kzalloc(alloc_size, GFP_KERNEL); 425 if (!rdev) 426 return NULL; 427 428 rdev->ops = ops; 429 430 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 431 432 if (unlikely(rdev->wiphy_idx < 0)) { 433 /* ugh, wrapped! */ 434 atomic_dec(&wiphy_counter); 435 kfree(rdev); 436 return NULL; 437 } 438 439 /* atomic_inc_return makes it start at 1, make it start at 0 */ 440 rdev->wiphy_idx--; 441 442 /* give it a proper name */ 443 if (requested_name && requested_name[0]) { 444 int rv; 445 446 rtnl_lock(); 447 rv = cfg80211_dev_check_name(rdev, requested_name); 448 449 if (rv < 0) { 450 rtnl_unlock(); 451 goto use_default_name; 452 } 453 454 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); 455 rtnl_unlock(); 456 if (rv) 457 goto use_default_name; 458 } else { 459 int rv; 460 461 use_default_name: 462 /* NOTE: This is *probably* safe w/out holding rtnl because of 463 * the restrictions on phy names. Probably this call could 464 * fail if some other part of the kernel (re)named a device 465 * phyX. But, might should add some locking and check return 466 * value, and use a different name if this one exists? 467 */ 468 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 469 if (rv < 0) { 470 kfree(rdev); 471 return NULL; 472 } 473 } 474 475 INIT_LIST_HEAD(&rdev->wiphy.wdev_list); 476 INIT_LIST_HEAD(&rdev->beacon_registrations); 477 spin_lock_init(&rdev->beacon_registrations_lock); 478 spin_lock_init(&rdev->bss_lock); 479 INIT_LIST_HEAD(&rdev->bss_list); 480 INIT_LIST_HEAD(&rdev->sched_scan_req_list); 481 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 482 INIT_LIST_HEAD(&rdev->mlme_unreg); 483 spin_lock_init(&rdev->mlme_unreg_lock); 484 INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk); 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); 502 503 #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_sync, cfg80211_rfkill_sync_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_DMG)))) 696 return -EINVAL; 697 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths & 698 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) | 699 BIT(NL80211_CHAN_WIDTH_20) | 700 BIT(NL80211_CHAN_WIDTH_40) | 701 BIT(NL80211_CHAN_WIDTH_80) | 702 BIT(NL80211_CHAN_WIDTH_80P80) | 703 BIT(NL80211_CHAN_WIDTH_160) | 704 BIT(NL80211_CHAN_WIDTH_5) | 705 BIT(NL80211_CHAN_WIDTH_10)))) 706 return -EINVAL; 707 } 708 709 /* 710 * if a wiphy has unsupported modes for regulatory channel enforcement, 711 * opt-out of enforcement checking 712 */ 713 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) | 714 BIT(NL80211_IFTYPE_P2P_CLIENT) | 715 BIT(NL80211_IFTYPE_AP) | 716 BIT(NL80211_IFTYPE_P2P_GO) | 717 BIT(NL80211_IFTYPE_ADHOC) | 718 BIT(NL80211_IFTYPE_P2P_DEVICE) | 719 BIT(NL80211_IFTYPE_NAN) | 720 BIT(NL80211_IFTYPE_AP_VLAN) | 721 BIT(NL80211_IFTYPE_MONITOR))) 722 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF; 723 724 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 725 (wiphy->regulatory_flags & 726 (REGULATORY_CUSTOM_REG | 727 REGULATORY_STRICT_REG | 728 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 729 REGULATORY_COUNTRY_IE_IGNORE)))) 730 return -EINVAL; 731 732 if (WARN_ON(wiphy->coalesce && 733 (!wiphy->coalesce->n_rules || 734 !wiphy->coalesce->n_patterns) && 735 (!wiphy->coalesce->pattern_min_len || 736 wiphy->coalesce->pattern_min_len > 737 wiphy->coalesce->pattern_max_len))) 738 return -EINVAL; 739 740 if (WARN_ON(wiphy->ap_sme_capa && 741 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 742 return -EINVAL; 743 744 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 745 return -EINVAL; 746 747 if (WARN_ON(wiphy->addresses && 748 !is_zero_ether_addr(wiphy->perm_addr) && 749 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 750 ETH_ALEN))) 751 return -EINVAL; 752 753 if (WARN_ON(wiphy->max_acl_mac_addrs && 754 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 755 !rdev->ops->set_mac_acl))) 756 return -EINVAL; 757 758 /* assure only valid behaviours are flagged by driver 759 * hence subtract 2 as bit 0 is invalid. 760 */ 761 if (WARN_ON(wiphy->bss_select_support && 762 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 763 return -EINVAL; 764 765 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy, 766 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) && 767 (!rdev->ops->set_pmk || !rdev->ops->del_pmk))) 768 return -EINVAL; 769 770 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) && 771 rdev->ops->update_connect_params)) 772 return -EINVAL; 773 774 if (wiphy->addresses) 775 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 776 777 /* sanity check ifmodes */ 778 WARN_ON(!ifmodes); 779 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 780 if (WARN_ON(ifmodes != wiphy->interface_modes)) 781 wiphy->interface_modes = ifmodes; 782 783 res = wiphy_verify_combinations(wiphy); 784 if (res) 785 return res; 786 787 /* sanity check supported bands/channels */ 788 for (band = 0; band < NUM_NL80211_BANDS; band++) { 789 u16 types = 0; 790 791 sband = wiphy->bands[band]; 792 if (!sband) 793 continue; 794 795 sband->band = band; 796 if (WARN_ON(!sband->n_channels)) 797 return -EINVAL; 798 /* 799 * on 60GHz band, there are no legacy rates, so 800 * n_bitrates is 0 801 */ 802 if (WARN_ON(band != NL80211_BAND_60GHZ && 803 !sband->n_bitrates)) 804 return -EINVAL; 805 806 /* 807 * Since cfg80211_disable_40mhz_24ghz is global, we can 808 * modify the sband's ht data even if the driver uses a 809 * global structure for that. 810 */ 811 if (cfg80211_disable_40mhz_24ghz && 812 band == NL80211_BAND_2GHZ && 813 sband->ht_cap.ht_supported) { 814 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 815 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 816 } 817 818 /* 819 * Since we use a u32 for rate bitmaps in 820 * ieee80211_get_response_rate, we cannot 821 * have more than 32 legacy rates. 822 */ 823 if (WARN_ON(sband->n_bitrates > 32)) 824 return -EINVAL; 825 826 for (i = 0; i < sband->n_channels; i++) { 827 sband->channels[i].orig_flags = 828 sband->channels[i].flags; 829 sband->channels[i].orig_mag = INT_MAX; 830 sband->channels[i].orig_mpwr = 831 sband->channels[i].max_power; 832 sband->channels[i].band = band; 833 } 834 835 for (i = 0; i < sband->n_iftype_data; i++) { 836 const struct ieee80211_sband_iftype_data *iftd; 837 838 iftd = &sband->iftype_data[i]; 839 840 if (WARN_ON(!iftd->types_mask)) 841 return -EINVAL; 842 if (WARN_ON(types & iftd->types_mask)) 843 return -EINVAL; 844 845 /* at least one piece of information must be present */ 846 if (WARN_ON(!iftd->he_cap.has_he)) 847 return -EINVAL; 848 849 types |= iftd->types_mask; 850 } 851 852 have_band = true; 853 } 854 855 if (!have_band) { 856 WARN_ON(1); 857 return -EINVAL; 858 } 859 860 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) { 861 /* 862 * Validate we have a policy (can be explicitly set to 863 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that 864 * we have at least one of doit/dumpit. 865 */ 866 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy)) 867 return -EINVAL; 868 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit && 869 !rdev->wiphy.vendor_commands[i].dumpit)) 870 return -EINVAL; 871 } 872 873 #ifdef CONFIG_PM 874 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 875 (!rdev->wiphy.wowlan->pattern_min_len || 876 rdev->wiphy.wowlan->pattern_min_len > 877 rdev->wiphy.wowlan->pattern_max_len))) 878 return -EINVAL; 879 #endif 880 881 /* check and set up bitrates */ 882 ieee80211_set_bitrate_flags(wiphy); 883 884 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 885 886 rtnl_lock(); 887 res = device_add(&rdev->wiphy.dev); 888 if (res) { 889 rtnl_unlock(); 890 return res; 891 } 892 893 /* set up regulatory info */ 894 wiphy_regulatory_register(wiphy); 895 896 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 897 cfg80211_rdev_list_generation++; 898 899 /* add to debugfs */ 900 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy), 901 ieee80211_debugfs_dir); 902 903 cfg80211_debugfs_rdev_add(rdev); 904 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 905 906 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 907 struct regulatory_request request; 908 909 request.wiphy_idx = get_wiphy_idx(wiphy); 910 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 911 request.alpha2[0] = '9'; 912 request.alpha2[1] = '9'; 913 914 nl80211_send_reg_change_event(&request); 915 } 916 917 /* Check that nobody globally advertises any capabilities they do not 918 * advertise on all possible interface types. 919 */ 920 if (wiphy->extended_capabilities_len && 921 wiphy->num_iftype_ext_capab && 922 wiphy->iftype_ext_capab) { 923 u8 supported_on_all, j; 924 const struct wiphy_iftype_ext_capab *capab; 925 926 capab = wiphy->iftype_ext_capab; 927 for (j = 0; j < wiphy->extended_capabilities_len; j++) { 928 if (capab[0].extended_capabilities_len > j) 929 supported_on_all = 930 capab[0].extended_capabilities[j]; 931 else 932 supported_on_all = 0x00; 933 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) { 934 if (j >= capab[i].extended_capabilities_len) { 935 supported_on_all = 0x00; 936 break; 937 } 938 supported_on_all &= 939 capab[i].extended_capabilities[j]; 940 } 941 if (WARN_ON(wiphy->extended_capabilities[j] & 942 ~supported_on_all)) 943 break; 944 } 945 } 946 947 rdev->wiphy.registered = true; 948 rtnl_unlock(); 949 950 res = rfkill_register(rdev->rfkill); 951 if (res) { 952 rfkill_destroy(rdev->rfkill); 953 rdev->rfkill = NULL; 954 wiphy_unregister(&rdev->wiphy); 955 return res; 956 } 957 958 return 0; 959 } 960 EXPORT_SYMBOL(wiphy_register); 961 962 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 963 { 964 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 965 966 if (!rdev->ops->rfkill_poll) 967 return; 968 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 969 rfkill_resume_polling(rdev->rfkill); 970 } 971 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 972 973 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 974 { 975 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 976 977 rfkill_pause_polling(rdev->rfkill); 978 } 979 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 980 981 void wiphy_unregister(struct wiphy *wiphy) 982 { 983 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 984 985 wait_event(rdev->dev_wait, ({ 986 int __count; 987 rtnl_lock(); 988 __count = rdev->opencount; 989 rtnl_unlock(); 990 __count == 0; })); 991 992 if (rdev->rfkill) 993 rfkill_unregister(rdev->rfkill); 994 995 rtnl_lock(); 996 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 997 rdev->wiphy.registered = false; 998 999 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 1000 1001 /* 1002 * First remove the hardware from everywhere, this makes 1003 * it impossible to find from userspace. 1004 */ 1005 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 1006 list_del_rcu(&rdev->list); 1007 synchronize_rcu(); 1008 1009 /* 1010 * If this device got a regulatory hint tell core its 1011 * free to listen now to a new shiny device regulatory hint 1012 */ 1013 wiphy_regulatory_deregister(wiphy); 1014 1015 cfg80211_rdev_list_generation++; 1016 device_del(&rdev->wiphy.dev); 1017 1018 rtnl_unlock(); 1019 1020 flush_work(&rdev->scan_done_wk); 1021 cancel_work_sync(&rdev->conn_work); 1022 flush_work(&rdev->event_work); 1023 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 1024 flush_work(&rdev->destroy_work); 1025 flush_work(&rdev->sched_scan_stop_wk); 1026 flush_work(&rdev->mlme_unreg_wk); 1027 flush_work(&rdev->propagate_radar_detect_wk); 1028 flush_work(&rdev->propagate_cac_done_wk); 1029 1030 #ifdef CONFIG_PM 1031 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 1032 rdev_set_wakeup(rdev, false); 1033 #endif 1034 cfg80211_rdev_free_wowlan(rdev); 1035 cfg80211_rdev_free_coalesce(rdev); 1036 } 1037 EXPORT_SYMBOL(wiphy_unregister); 1038 1039 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 1040 { 1041 struct cfg80211_internal_bss *scan, *tmp; 1042 struct cfg80211_beacon_registration *reg, *treg; 1043 rfkill_destroy(rdev->rfkill); 1044 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 1045 list_del(®->list); 1046 kfree(reg); 1047 } 1048 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 1049 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 1050 kfree(rdev); 1051 } 1052 1053 void wiphy_free(struct wiphy *wiphy) 1054 { 1055 put_device(&wiphy->dev); 1056 } 1057 EXPORT_SYMBOL(wiphy_free); 1058 1059 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 1060 { 1061 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1062 1063 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 1064 schedule_work(&rdev->rfkill_sync); 1065 } 1066 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 1067 1068 void cfg80211_cqm_config_free(struct wireless_dev *wdev) 1069 { 1070 kfree(wdev->cqm_config); 1071 wdev->cqm_config = NULL; 1072 } 1073 1074 static void __cfg80211_unregister_wdev(struct wireless_dev *wdev, bool sync) 1075 { 1076 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1077 1078 ASSERT_RTNL(); 1079 1080 flush_work(&wdev->pmsr_free_wk); 1081 1082 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 1083 1084 list_del_rcu(&wdev->list); 1085 if (sync) 1086 synchronize_rcu(); 1087 rdev->devlist_generation++; 1088 1089 cfg80211_mlme_purge_registrations(wdev); 1090 1091 switch (wdev->iftype) { 1092 case NL80211_IFTYPE_P2P_DEVICE: 1093 cfg80211_stop_p2p_device(rdev, wdev); 1094 break; 1095 case NL80211_IFTYPE_NAN: 1096 cfg80211_stop_nan(rdev, wdev); 1097 break; 1098 default: 1099 break; 1100 } 1101 1102 #ifdef CONFIG_CFG80211_WEXT 1103 kzfree(wdev->wext.keys); 1104 #endif 1105 /* only initialized if we have a netdev */ 1106 if (wdev->netdev) 1107 flush_work(&wdev->disconnect_wk); 1108 1109 cfg80211_cqm_config_free(wdev); 1110 } 1111 1112 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 1113 { 1114 if (WARN_ON(wdev->netdev)) 1115 return; 1116 1117 __cfg80211_unregister_wdev(wdev, true); 1118 } 1119 EXPORT_SYMBOL(cfg80211_unregister_wdev); 1120 1121 static const struct device_type wiphy_type = { 1122 .name = "wlan", 1123 }; 1124 1125 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 1126 enum nl80211_iftype iftype, int num) 1127 { 1128 ASSERT_RTNL(); 1129 1130 rdev->num_running_ifaces += num; 1131 if (iftype == NL80211_IFTYPE_MONITOR) 1132 rdev->num_running_monitor_ifaces += num; 1133 } 1134 1135 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 1136 struct wireless_dev *wdev) 1137 { 1138 struct net_device *dev = wdev->netdev; 1139 struct cfg80211_sched_scan_request *pos, *tmp; 1140 1141 ASSERT_RTNL(); 1142 ASSERT_WDEV_LOCK(wdev); 1143 1144 cfg80211_pmsr_wdev_down(wdev); 1145 1146 switch (wdev->iftype) { 1147 case NL80211_IFTYPE_ADHOC: 1148 __cfg80211_leave_ibss(rdev, dev, true); 1149 break; 1150 case NL80211_IFTYPE_P2P_CLIENT: 1151 case NL80211_IFTYPE_STATION: 1152 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, 1153 list) { 1154 if (dev == pos->dev) 1155 cfg80211_stop_sched_scan_req(rdev, pos, false); 1156 } 1157 1158 #ifdef CONFIG_CFG80211_WEXT 1159 kfree(wdev->wext.ie); 1160 wdev->wext.ie = NULL; 1161 wdev->wext.ie_len = 0; 1162 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1163 #endif 1164 cfg80211_disconnect(rdev, dev, 1165 WLAN_REASON_DEAUTH_LEAVING, true); 1166 break; 1167 case NL80211_IFTYPE_MESH_POINT: 1168 __cfg80211_leave_mesh(rdev, dev); 1169 break; 1170 case NL80211_IFTYPE_AP: 1171 case NL80211_IFTYPE_P2P_GO: 1172 __cfg80211_stop_ap(rdev, dev, true); 1173 break; 1174 case NL80211_IFTYPE_OCB: 1175 __cfg80211_leave_ocb(rdev, dev); 1176 break; 1177 case NL80211_IFTYPE_WDS: 1178 /* must be handled by mac80211/driver, has no APIs */ 1179 break; 1180 case NL80211_IFTYPE_P2P_DEVICE: 1181 case NL80211_IFTYPE_NAN: 1182 /* cannot happen, has no netdev */ 1183 break; 1184 case NL80211_IFTYPE_AP_VLAN: 1185 case NL80211_IFTYPE_MONITOR: 1186 /* nothing to do */ 1187 break; 1188 case NL80211_IFTYPE_UNSPECIFIED: 1189 case NUM_NL80211_IFTYPES: 1190 /* invalid */ 1191 break; 1192 } 1193 } 1194 1195 void cfg80211_leave(struct cfg80211_registered_device *rdev, 1196 struct wireless_dev *wdev) 1197 { 1198 wdev_lock(wdev); 1199 __cfg80211_leave(rdev, wdev); 1200 wdev_unlock(wdev); 1201 } 1202 1203 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 1204 gfp_t gfp) 1205 { 1206 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1207 struct cfg80211_event *ev; 1208 unsigned long flags; 1209 1210 trace_cfg80211_stop_iface(wiphy, wdev); 1211 1212 ev = kzalloc(sizeof(*ev), gfp); 1213 if (!ev) 1214 return; 1215 1216 ev->type = EVENT_STOPPED; 1217 1218 spin_lock_irqsave(&wdev->event_lock, flags); 1219 list_add_tail(&ev->list, &wdev->event_list); 1220 spin_unlock_irqrestore(&wdev->event_lock, flags); 1221 queue_work(cfg80211_wq, &rdev->event_work); 1222 } 1223 EXPORT_SYMBOL(cfg80211_stop_iface); 1224 1225 void cfg80211_init_wdev(struct cfg80211_registered_device *rdev, 1226 struct wireless_dev *wdev) 1227 { 1228 mutex_init(&wdev->mtx); 1229 INIT_LIST_HEAD(&wdev->event_list); 1230 spin_lock_init(&wdev->event_lock); 1231 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1232 spin_lock_init(&wdev->mgmt_registrations_lock); 1233 INIT_LIST_HEAD(&wdev->pmsr_list); 1234 spin_lock_init(&wdev->pmsr_lock); 1235 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk); 1236 1237 /* 1238 * We get here also when the interface changes network namespaces, 1239 * as it's registered into the new one, but we don't want it to 1240 * change ID in that case. Checking if the ID is already assigned 1241 * works, because 0 isn't considered a valid ID and the memory is 1242 * 0-initialized. 1243 */ 1244 if (!wdev->identifier) 1245 wdev->identifier = ++rdev->wdev_id; 1246 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list); 1247 rdev->devlist_generation++; 1248 1249 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 1250 } 1251 1252 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 1253 unsigned long state, void *ptr) 1254 { 1255 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1256 struct wireless_dev *wdev = dev->ieee80211_ptr; 1257 struct cfg80211_registered_device *rdev; 1258 struct cfg80211_sched_scan_request *pos, *tmp; 1259 1260 if (!wdev) 1261 return NOTIFY_DONE; 1262 1263 rdev = wiphy_to_rdev(wdev->wiphy); 1264 1265 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 1266 1267 switch (state) { 1268 case NETDEV_POST_INIT: 1269 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 1270 break; 1271 case NETDEV_REGISTER: 1272 /* 1273 * NB: cannot take rdev->mtx here because this may be 1274 * called within code protected by it when interfaces 1275 * are added with nl80211. 1276 */ 1277 /* can only change netns with wiphy */ 1278 dev->features |= NETIF_F_NETNS_LOCAL; 1279 1280 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 1281 "phy80211")) { 1282 pr_err("failed to add phy80211 symlink to netdev!\n"); 1283 } 1284 wdev->netdev = dev; 1285 #ifdef CONFIG_CFG80211_WEXT 1286 wdev->wext.default_key = -1; 1287 wdev->wext.default_mgmt_key = -1; 1288 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1289 #endif 1290 1291 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1292 wdev->ps = true; 1293 else 1294 wdev->ps = false; 1295 /* allow mac80211 to determine the timeout */ 1296 wdev->ps_timeout = -1; 1297 1298 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1299 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1300 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1301 dev->priv_flags |= IFF_DONT_BRIDGE; 1302 1303 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk); 1304 1305 cfg80211_init_wdev(rdev, wdev); 1306 break; 1307 case NETDEV_GOING_DOWN: 1308 cfg80211_leave(rdev, wdev); 1309 break; 1310 case NETDEV_DOWN: 1311 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1312 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1313 if (WARN_ON(!rdev->scan_req->notified)) 1314 rdev->scan_req->info.aborted = true; 1315 ___cfg80211_scan_done(rdev, false); 1316 } 1317 1318 list_for_each_entry_safe(pos, tmp, 1319 &rdev->sched_scan_req_list, list) { 1320 if (WARN_ON(pos->dev == wdev->netdev)) 1321 cfg80211_stop_sched_scan_req(rdev, pos, false); 1322 } 1323 1324 rdev->opencount--; 1325 wake_up(&rdev->dev_wait); 1326 break; 1327 case NETDEV_UP: 1328 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1329 wdev_lock(wdev); 1330 switch (wdev->iftype) { 1331 #ifdef CONFIG_CFG80211_WEXT 1332 case NL80211_IFTYPE_ADHOC: 1333 cfg80211_ibss_wext_join(rdev, wdev); 1334 break; 1335 case NL80211_IFTYPE_STATION: 1336 cfg80211_mgd_wext_connect(rdev, wdev); 1337 break; 1338 #endif 1339 #ifdef CONFIG_MAC80211_MESH 1340 case NL80211_IFTYPE_MESH_POINT: 1341 { 1342 /* backward compat code... */ 1343 struct mesh_setup setup; 1344 memcpy(&setup, &default_mesh_setup, 1345 sizeof(setup)); 1346 /* back compat only needed for mesh_id */ 1347 setup.mesh_id = wdev->ssid; 1348 setup.mesh_id_len = wdev->mesh_id_up_len; 1349 if (wdev->mesh_id_up_len) 1350 __cfg80211_join_mesh(rdev, dev, 1351 &setup, 1352 &default_mesh_config); 1353 break; 1354 } 1355 #endif 1356 default: 1357 break; 1358 } 1359 wdev_unlock(wdev); 1360 rdev->opencount++; 1361 1362 /* 1363 * Configure power management to the driver here so that its 1364 * correctly set also after interface type changes etc. 1365 */ 1366 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1367 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1368 rdev->ops->set_power_mgmt && 1369 rdev_set_power_mgmt(rdev, dev, wdev->ps, 1370 wdev->ps_timeout)) { 1371 /* assume this means it's off */ 1372 wdev->ps = false; 1373 } 1374 break; 1375 case NETDEV_UNREGISTER: 1376 /* 1377 * It is possible to get NETDEV_UNREGISTER 1378 * multiple times. To detect that, check 1379 * that the interface is still on the list 1380 * of registered interfaces, and only then 1381 * remove and clean it up. 1382 */ 1383 if (!list_empty(&wdev->list)) { 1384 __cfg80211_unregister_wdev(wdev, false); 1385 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 1386 } 1387 /* 1388 * synchronise (so that we won't find this netdev 1389 * from other code any more) and then clear the list 1390 * head so that the above code can safely check for 1391 * !list_empty() to avoid double-cleanup. 1392 */ 1393 synchronize_rcu(); 1394 INIT_LIST_HEAD(&wdev->list); 1395 /* 1396 * Ensure that all events have been processed and 1397 * freed. 1398 */ 1399 cfg80211_process_wdev_events(wdev); 1400 1401 if (WARN_ON(wdev->current_bss)) { 1402 cfg80211_unhold_bss(wdev->current_bss); 1403 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 1404 wdev->current_bss = NULL; 1405 } 1406 break; 1407 case NETDEV_PRE_UP: 1408 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype, 1409 wdev->use_4addr, 0)) 1410 return notifier_from_errno(-EOPNOTSUPP); 1411 1412 if (rfkill_blocked(rdev->rfkill)) 1413 return notifier_from_errno(-ERFKILL); 1414 break; 1415 default: 1416 return NOTIFY_DONE; 1417 } 1418 1419 wireless_nlevent_flush(); 1420 1421 return NOTIFY_OK; 1422 } 1423 1424 static struct notifier_block cfg80211_netdev_notifier = { 1425 .notifier_call = cfg80211_netdev_notifier_call, 1426 }; 1427 1428 static void __net_exit cfg80211_pernet_exit(struct net *net) 1429 { 1430 struct cfg80211_registered_device *rdev; 1431 1432 rtnl_lock(); 1433 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1434 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1435 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1436 } 1437 rtnl_unlock(); 1438 } 1439 1440 static struct pernet_operations cfg80211_pernet_ops = { 1441 .exit = cfg80211_pernet_exit, 1442 }; 1443 1444 static int __init cfg80211_init(void) 1445 { 1446 int err; 1447 1448 err = register_pernet_device(&cfg80211_pernet_ops); 1449 if (err) 1450 goto out_fail_pernet; 1451 1452 err = wiphy_sysfs_init(); 1453 if (err) 1454 goto out_fail_sysfs; 1455 1456 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1457 if (err) 1458 goto out_fail_notifier; 1459 1460 err = nl80211_init(); 1461 if (err) 1462 goto out_fail_nl80211; 1463 1464 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1465 1466 err = regulatory_init(); 1467 if (err) 1468 goto out_fail_reg; 1469 1470 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM); 1471 if (!cfg80211_wq) { 1472 err = -ENOMEM; 1473 goto out_fail_wq; 1474 } 1475 1476 return 0; 1477 1478 out_fail_wq: 1479 regulatory_exit(); 1480 out_fail_reg: 1481 debugfs_remove(ieee80211_debugfs_dir); 1482 nl80211_exit(); 1483 out_fail_nl80211: 1484 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1485 out_fail_notifier: 1486 wiphy_sysfs_exit(); 1487 out_fail_sysfs: 1488 unregister_pernet_device(&cfg80211_pernet_ops); 1489 out_fail_pernet: 1490 return err; 1491 } 1492 fs_initcall(cfg80211_init); 1493 1494 static void __exit cfg80211_exit(void) 1495 { 1496 debugfs_remove(ieee80211_debugfs_dir); 1497 nl80211_exit(); 1498 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1499 wiphy_sysfs_exit(); 1500 regulatory_exit(); 1501 unregister_pernet_device(&cfg80211_pernet_ops); 1502 destroy_workqueue(cfg80211_wq); 1503 } 1504 module_exit(cfg80211_exit); 1505