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) 2018-2019 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_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_LIST_HEAD(&rdev->mlme_unreg); 484 spin_lock_init(&rdev->mlme_unreg_lock); 485 INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk); 486 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 487 cfg80211_dfs_channels_update_work); 488 #ifdef CONFIG_CFG80211_WEXT 489 rdev->wiphy.wext = &cfg80211_wext_handler; 490 #endif 491 492 device_initialize(&rdev->wiphy.dev); 493 rdev->wiphy.dev.class = &ieee80211_class; 494 rdev->wiphy.dev.platform_data = rdev; 495 device_enable_async_suspend(&rdev->wiphy.dev); 496 497 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 498 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 499 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk); 500 INIT_WORK(&rdev->propagate_radar_detect_wk, 501 cfg80211_propagate_radar_detect_wk); 502 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk); 503 504 #ifdef CONFIG_CFG80211_DEFAULT_PS 505 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 506 #endif 507 508 wiphy_net_set(&rdev->wiphy, &init_net); 509 510 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 511 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 512 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 513 &rdev->rfkill_ops, rdev); 514 515 if (!rdev->rfkill) { 516 wiphy_free(&rdev->wiphy); 517 return NULL; 518 } 519 520 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work); 521 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 522 INIT_WORK(&rdev->event_work, cfg80211_event_work); 523 524 init_waitqueue_head(&rdev->dev_wait); 525 526 /* 527 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 528 * Fragmentation and RTS threshold are disabled by default with the 529 * special -1 value. 530 */ 531 rdev->wiphy.retry_short = 7; 532 rdev->wiphy.retry_long = 4; 533 rdev->wiphy.frag_threshold = (u32) -1; 534 rdev->wiphy.rts_threshold = (u32) -1; 535 rdev->wiphy.coverage_class = 0; 536 537 rdev->wiphy.max_num_csa_counters = 1; 538 539 rdev->wiphy.max_sched_scan_plans = 1; 540 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 541 542 return &rdev->wiphy; 543 } 544 EXPORT_SYMBOL(wiphy_new_nm); 545 546 static int wiphy_verify_combinations(struct wiphy *wiphy) 547 { 548 const struct ieee80211_iface_combination *c; 549 int i, j; 550 551 for (i = 0; i < wiphy->n_iface_combinations; i++) { 552 u32 cnt = 0; 553 u16 all_iftypes = 0; 554 555 c = &wiphy->iface_combinations[i]; 556 557 /* 558 * Combinations with just one interface aren't real, 559 * however we make an exception for DFS. 560 */ 561 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 562 return -EINVAL; 563 564 /* Need at least one channel */ 565 if (WARN_ON(!c->num_different_channels)) 566 return -EINVAL; 567 568 /* 569 * Put a sane limit on maximum number of different 570 * channels to simplify channel accounting code. 571 */ 572 if (WARN_ON(c->num_different_channels > 573 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 574 return -EINVAL; 575 576 /* DFS only works on one channel. */ 577 if (WARN_ON(c->radar_detect_widths && 578 (c->num_different_channels > 1))) 579 return -EINVAL; 580 581 if (WARN_ON(!c->n_limits)) 582 return -EINVAL; 583 584 for (j = 0; j < c->n_limits; j++) { 585 u16 types = c->limits[j].types; 586 587 /* interface types shouldn't overlap */ 588 if (WARN_ON(types & all_iftypes)) 589 return -EINVAL; 590 all_iftypes |= types; 591 592 if (WARN_ON(!c->limits[j].max)) 593 return -EINVAL; 594 595 /* Shouldn't list software iftypes in combinations! */ 596 if (WARN_ON(wiphy->software_iftypes & types)) 597 return -EINVAL; 598 599 /* Only a single P2P_DEVICE can be allowed */ 600 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 601 c->limits[j].max > 1)) 602 return -EINVAL; 603 604 /* Only a single NAN can be allowed */ 605 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) && 606 c->limits[j].max > 1)) 607 return -EINVAL; 608 609 /* 610 * This isn't well-defined right now. If you have an 611 * IBSS interface, then its beacon interval may change 612 * by joining other networks, and nothing prevents it 613 * from doing that. 614 * So technically we probably shouldn't even allow AP 615 * and IBSS in the same interface, but it seems that 616 * some drivers support that, possibly only with fixed 617 * beacon intervals for IBSS. 618 */ 619 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) && 620 c->beacon_int_min_gcd)) { 621 return -EINVAL; 622 } 623 624 cnt += c->limits[j].max; 625 /* 626 * Don't advertise an unsupported type 627 * in a combination. 628 */ 629 if (WARN_ON((wiphy->interface_modes & types) != types)) 630 return -EINVAL; 631 } 632 633 #ifndef CONFIG_WIRELESS_WDS 634 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS))) 635 return -EINVAL; 636 #endif 637 638 /* You can't even choose that many! */ 639 if (WARN_ON(cnt < c->max_interfaces)) 640 return -EINVAL; 641 } 642 643 return 0; 644 } 645 646 int wiphy_register(struct wiphy *wiphy) 647 { 648 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 649 int res; 650 enum nl80211_band band; 651 struct ieee80211_supported_band *sband; 652 bool have_band = false; 653 int i; 654 u16 ifmodes = wiphy->interface_modes; 655 656 #ifdef CONFIG_PM 657 if (WARN_ON(wiphy->wowlan && 658 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 659 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 660 return -EINVAL; 661 if (WARN_ON(wiphy->wowlan && 662 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 663 !wiphy->wowlan->tcp)) 664 return -EINVAL; 665 #endif 666 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 667 (!rdev->ops->tdls_channel_switch || 668 !rdev->ops->tdls_cancel_channel_switch))) 669 return -EINVAL; 670 671 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) && 672 (!rdev->ops->start_nan || !rdev->ops->stop_nan || 673 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func || 674 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ))))) 675 return -EINVAL; 676 677 #ifndef CONFIG_WIRELESS_WDS 678 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))) 679 return -EINVAL; 680 #endif 681 682 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported)) 683 return -EINVAL; 684 685 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) { 686 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap && 687 !wiphy->pmsr_capa->ftm.non_asap)) 688 return -EINVAL; 689 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles || 690 !wiphy->pmsr_capa->ftm.bandwidths)) 691 return -EINVAL; 692 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles & 693 ~(BIT(NL80211_PREAMBLE_LEGACY) | 694 BIT(NL80211_PREAMBLE_HT) | 695 BIT(NL80211_PREAMBLE_VHT) | 696 BIT(NL80211_PREAMBLE_DMG)))) 697 return -EINVAL; 698 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths & 699 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) | 700 BIT(NL80211_CHAN_WIDTH_20) | 701 BIT(NL80211_CHAN_WIDTH_40) | 702 BIT(NL80211_CHAN_WIDTH_80) | 703 BIT(NL80211_CHAN_WIDTH_80P80) | 704 BIT(NL80211_CHAN_WIDTH_160) | 705 BIT(NL80211_CHAN_WIDTH_5) | 706 BIT(NL80211_CHAN_WIDTH_10)))) 707 return -EINVAL; 708 } 709 710 /* 711 * if a wiphy has unsupported modes for regulatory channel enforcement, 712 * opt-out of enforcement checking 713 */ 714 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) | 715 BIT(NL80211_IFTYPE_P2P_CLIENT) | 716 BIT(NL80211_IFTYPE_AP) | 717 BIT(NL80211_IFTYPE_P2P_GO) | 718 BIT(NL80211_IFTYPE_ADHOC) | 719 BIT(NL80211_IFTYPE_P2P_DEVICE) | 720 BIT(NL80211_IFTYPE_NAN) | 721 BIT(NL80211_IFTYPE_AP_VLAN) | 722 BIT(NL80211_IFTYPE_MONITOR))) 723 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF; 724 725 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 726 (wiphy->regulatory_flags & 727 (REGULATORY_CUSTOM_REG | 728 REGULATORY_STRICT_REG | 729 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 730 REGULATORY_COUNTRY_IE_IGNORE)))) 731 return -EINVAL; 732 733 if (WARN_ON(wiphy->coalesce && 734 (!wiphy->coalesce->n_rules || 735 !wiphy->coalesce->n_patterns) && 736 (!wiphy->coalesce->pattern_min_len || 737 wiphy->coalesce->pattern_min_len > 738 wiphy->coalesce->pattern_max_len))) 739 return -EINVAL; 740 741 if (WARN_ON(wiphy->ap_sme_capa && 742 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 743 return -EINVAL; 744 745 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 746 return -EINVAL; 747 748 if (WARN_ON(wiphy->addresses && 749 !is_zero_ether_addr(wiphy->perm_addr) && 750 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 751 ETH_ALEN))) 752 return -EINVAL; 753 754 if (WARN_ON(wiphy->max_acl_mac_addrs && 755 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 756 !rdev->ops->set_mac_acl))) 757 return -EINVAL; 758 759 /* assure only valid behaviours are flagged by driver 760 * hence subtract 2 as bit 0 is invalid. 761 */ 762 if (WARN_ON(wiphy->bss_select_support && 763 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 764 return -EINVAL; 765 766 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy, 767 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) && 768 (!rdev->ops->set_pmk || !rdev->ops->del_pmk))) 769 return -EINVAL; 770 771 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) && 772 rdev->ops->update_connect_params)) 773 return -EINVAL; 774 775 if (wiphy->addresses) 776 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 777 778 /* sanity check ifmodes */ 779 WARN_ON(!ifmodes); 780 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 781 if (WARN_ON(ifmodes != wiphy->interface_modes)) 782 wiphy->interface_modes = ifmodes; 783 784 res = wiphy_verify_combinations(wiphy); 785 if (res) 786 return res; 787 788 /* sanity check supported bands/channels */ 789 for (band = 0; band < NUM_NL80211_BANDS; band++) { 790 u16 types = 0; 791 792 sband = wiphy->bands[band]; 793 if (!sband) 794 continue; 795 796 sband->band = band; 797 if (WARN_ON(!sband->n_channels)) 798 return -EINVAL; 799 /* 800 * on 60GHz band, there are no legacy rates, so 801 * n_bitrates is 0 802 */ 803 if (WARN_ON(band != NL80211_BAND_60GHZ && 804 !sband->n_bitrates)) 805 return -EINVAL; 806 807 /* 808 * Since cfg80211_disable_40mhz_24ghz is global, we can 809 * modify the sband's ht data even if the driver uses a 810 * global structure for that. 811 */ 812 if (cfg80211_disable_40mhz_24ghz && 813 band == NL80211_BAND_2GHZ && 814 sband->ht_cap.ht_supported) { 815 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 816 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 817 } 818 819 /* 820 * Since we use a u32 for rate bitmaps in 821 * ieee80211_get_response_rate, we cannot 822 * have more than 32 legacy rates. 823 */ 824 if (WARN_ON(sband->n_bitrates > 32)) 825 return -EINVAL; 826 827 for (i = 0; i < sband->n_channels; i++) { 828 sband->channels[i].orig_flags = 829 sband->channels[i].flags; 830 sband->channels[i].orig_mag = INT_MAX; 831 sband->channels[i].orig_mpwr = 832 sband->channels[i].max_power; 833 sband->channels[i].band = band; 834 } 835 836 for (i = 0; i < sband->n_iftype_data; i++) { 837 const struct ieee80211_sband_iftype_data *iftd; 838 839 iftd = &sband->iftype_data[i]; 840 841 if (WARN_ON(!iftd->types_mask)) 842 return -EINVAL; 843 if (WARN_ON(types & iftd->types_mask)) 844 return -EINVAL; 845 846 /* at least one piece of information must be present */ 847 if (WARN_ON(!iftd->he_cap.has_he)) 848 return -EINVAL; 849 850 types |= iftd->types_mask; 851 } 852 853 have_band = true; 854 } 855 856 if (!have_band) { 857 WARN_ON(1); 858 return -EINVAL; 859 } 860 861 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) { 862 /* 863 * Validate we have a policy (can be explicitly set to 864 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that 865 * we have at least one of doit/dumpit. 866 */ 867 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy)) 868 return -EINVAL; 869 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit && 870 !rdev->wiphy.vendor_commands[i].dumpit)) 871 return -EINVAL; 872 } 873 874 #ifdef CONFIG_PM 875 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 876 (!rdev->wiphy.wowlan->pattern_min_len || 877 rdev->wiphy.wowlan->pattern_min_len > 878 rdev->wiphy.wowlan->pattern_max_len))) 879 return -EINVAL; 880 #endif 881 882 /* check and set up bitrates */ 883 ieee80211_set_bitrate_flags(wiphy); 884 885 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 886 887 rtnl_lock(); 888 res = device_add(&rdev->wiphy.dev); 889 if (res) { 890 rtnl_unlock(); 891 return res; 892 } 893 894 /* set up regulatory info */ 895 wiphy_regulatory_register(wiphy); 896 897 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 898 cfg80211_rdev_list_generation++; 899 900 /* add to debugfs */ 901 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy), 902 ieee80211_debugfs_dir); 903 904 cfg80211_debugfs_rdev_add(rdev); 905 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 906 907 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 908 struct regulatory_request request; 909 910 request.wiphy_idx = get_wiphy_idx(wiphy); 911 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 912 request.alpha2[0] = '9'; 913 request.alpha2[1] = '9'; 914 915 nl80211_send_reg_change_event(&request); 916 } 917 918 /* Check that nobody globally advertises any capabilities they do not 919 * advertise on all possible interface types. 920 */ 921 if (wiphy->extended_capabilities_len && 922 wiphy->num_iftype_ext_capab && 923 wiphy->iftype_ext_capab) { 924 u8 supported_on_all, j; 925 const struct wiphy_iftype_ext_capab *capab; 926 927 capab = wiphy->iftype_ext_capab; 928 for (j = 0; j < wiphy->extended_capabilities_len; j++) { 929 if (capab[0].extended_capabilities_len > j) 930 supported_on_all = 931 capab[0].extended_capabilities[j]; 932 else 933 supported_on_all = 0x00; 934 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) { 935 if (j >= capab[i].extended_capabilities_len) { 936 supported_on_all = 0x00; 937 break; 938 } 939 supported_on_all &= 940 capab[i].extended_capabilities[j]; 941 } 942 if (WARN_ON(wiphy->extended_capabilities[j] & 943 ~supported_on_all)) 944 break; 945 } 946 } 947 948 rdev->wiphy.registered = true; 949 rtnl_unlock(); 950 951 res = rfkill_register(rdev->rfkill); 952 if (res) { 953 rfkill_destroy(rdev->rfkill); 954 rdev->rfkill = NULL; 955 wiphy_unregister(&rdev->wiphy); 956 return res; 957 } 958 959 return 0; 960 } 961 EXPORT_SYMBOL(wiphy_register); 962 963 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 964 { 965 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 966 967 if (!rdev->ops->rfkill_poll) 968 return; 969 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 970 rfkill_resume_polling(rdev->rfkill); 971 } 972 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 973 974 void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 975 { 976 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 977 978 rfkill_pause_polling(rdev->rfkill); 979 } 980 EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 981 982 void wiphy_unregister(struct wiphy *wiphy) 983 { 984 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 985 986 wait_event(rdev->dev_wait, ({ 987 int __count; 988 rtnl_lock(); 989 __count = rdev->opencount; 990 rtnl_unlock(); 991 __count == 0; })); 992 993 if (rdev->rfkill) 994 rfkill_unregister(rdev->rfkill); 995 996 rtnl_lock(); 997 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 998 rdev->wiphy.registered = false; 999 1000 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 1001 1002 /* 1003 * First remove the hardware from everywhere, this makes 1004 * it impossible to find from userspace. 1005 */ 1006 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 1007 list_del_rcu(&rdev->list); 1008 synchronize_rcu(); 1009 1010 /* 1011 * If this device got a regulatory hint tell core its 1012 * free to listen now to a new shiny device regulatory hint 1013 */ 1014 wiphy_regulatory_deregister(wiphy); 1015 1016 cfg80211_rdev_list_generation++; 1017 device_del(&rdev->wiphy.dev); 1018 1019 rtnl_unlock(); 1020 1021 flush_work(&rdev->scan_done_wk); 1022 cancel_work_sync(&rdev->conn_work); 1023 flush_work(&rdev->event_work); 1024 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 1025 flush_work(&rdev->destroy_work); 1026 flush_work(&rdev->sched_scan_stop_wk); 1027 flush_work(&rdev->mlme_unreg_wk); 1028 flush_work(&rdev->propagate_radar_detect_wk); 1029 flush_work(&rdev->propagate_cac_done_wk); 1030 1031 #ifdef CONFIG_PM 1032 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 1033 rdev_set_wakeup(rdev, false); 1034 #endif 1035 cfg80211_rdev_free_wowlan(rdev); 1036 cfg80211_rdev_free_coalesce(rdev); 1037 } 1038 EXPORT_SYMBOL(wiphy_unregister); 1039 1040 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 1041 { 1042 struct cfg80211_internal_bss *scan, *tmp; 1043 struct cfg80211_beacon_registration *reg, *treg; 1044 rfkill_destroy(rdev->rfkill); 1045 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 1046 list_del(®->list); 1047 kfree(reg); 1048 } 1049 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 1050 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 1051 kfree(rdev); 1052 } 1053 1054 void wiphy_free(struct wiphy *wiphy) 1055 { 1056 put_device(&wiphy->dev); 1057 } 1058 EXPORT_SYMBOL(wiphy_free); 1059 1060 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 1061 { 1062 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1063 1064 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 1065 schedule_work(&rdev->rfkill_block); 1066 } 1067 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 1068 1069 void cfg80211_cqm_config_free(struct wireless_dev *wdev) 1070 { 1071 kfree(wdev->cqm_config); 1072 wdev->cqm_config = NULL; 1073 } 1074 1075 static void __cfg80211_unregister_wdev(struct wireless_dev *wdev, bool sync) 1076 { 1077 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1078 1079 ASSERT_RTNL(); 1080 1081 flush_work(&wdev->pmsr_free_wk); 1082 1083 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 1084 1085 list_del_rcu(&wdev->list); 1086 if (sync) 1087 synchronize_rcu(); 1088 rdev->devlist_generation++; 1089 1090 cfg80211_mlme_purge_registrations(wdev); 1091 1092 switch (wdev->iftype) { 1093 case NL80211_IFTYPE_P2P_DEVICE: 1094 cfg80211_stop_p2p_device(rdev, wdev); 1095 break; 1096 case NL80211_IFTYPE_NAN: 1097 cfg80211_stop_nan(rdev, wdev); 1098 break; 1099 default: 1100 break; 1101 } 1102 1103 #ifdef CONFIG_CFG80211_WEXT 1104 kzfree(wdev->wext.keys); 1105 wdev->wext.keys = NULL; 1106 #endif 1107 /* only initialized if we have a netdev */ 1108 if (wdev->netdev) 1109 flush_work(&wdev->disconnect_wk); 1110 1111 cfg80211_cqm_config_free(wdev); 1112 } 1113 1114 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 1115 { 1116 if (WARN_ON(wdev->netdev)) 1117 return; 1118 1119 __cfg80211_unregister_wdev(wdev, true); 1120 } 1121 EXPORT_SYMBOL(cfg80211_unregister_wdev); 1122 1123 static const struct device_type wiphy_type = { 1124 .name = "wlan", 1125 }; 1126 1127 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 1128 enum nl80211_iftype iftype, int num) 1129 { 1130 ASSERT_RTNL(); 1131 1132 rdev->num_running_ifaces += num; 1133 if (iftype == NL80211_IFTYPE_MONITOR) 1134 rdev->num_running_monitor_ifaces += num; 1135 } 1136 1137 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 1138 struct wireless_dev *wdev) 1139 { 1140 struct net_device *dev = wdev->netdev; 1141 struct cfg80211_sched_scan_request *pos, *tmp; 1142 1143 ASSERT_RTNL(); 1144 ASSERT_WDEV_LOCK(wdev); 1145 1146 cfg80211_pmsr_wdev_down(wdev); 1147 1148 switch (wdev->iftype) { 1149 case NL80211_IFTYPE_ADHOC: 1150 __cfg80211_leave_ibss(rdev, dev, true); 1151 break; 1152 case NL80211_IFTYPE_P2P_CLIENT: 1153 case NL80211_IFTYPE_STATION: 1154 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, 1155 list) { 1156 if (dev == pos->dev) 1157 cfg80211_stop_sched_scan_req(rdev, pos, false); 1158 } 1159 1160 #ifdef CONFIG_CFG80211_WEXT 1161 kfree(wdev->wext.ie); 1162 wdev->wext.ie = NULL; 1163 wdev->wext.ie_len = 0; 1164 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1165 #endif 1166 cfg80211_disconnect(rdev, dev, 1167 WLAN_REASON_DEAUTH_LEAVING, true); 1168 break; 1169 case NL80211_IFTYPE_MESH_POINT: 1170 __cfg80211_leave_mesh(rdev, dev); 1171 break; 1172 case NL80211_IFTYPE_AP: 1173 case NL80211_IFTYPE_P2P_GO: 1174 __cfg80211_stop_ap(rdev, dev, true); 1175 break; 1176 case NL80211_IFTYPE_OCB: 1177 __cfg80211_leave_ocb(rdev, dev); 1178 break; 1179 case NL80211_IFTYPE_WDS: 1180 /* must be handled by mac80211/driver, has no APIs */ 1181 break; 1182 case NL80211_IFTYPE_P2P_DEVICE: 1183 case NL80211_IFTYPE_NAN: 1184 /* cannot happen, has no netdev */ 1185 break; 1186 case NL80211_IFTYPE_AP_VLAN: 1187 case NL80211_IFTYPE_MONITOR: 1188 /* nothing to do */ 1189 break; 1190 case NL80211_IFTYPE_UNSPECIFIED: 1191 case NUM_NL80211_IFTYPES: 1192 /* invalid */ 1193 break; 1194 } 1195 } 1196 1197 void cfg80211_leave(struct cfg80211_registered_device *rdev, 1198 struct wireless_dev *wdev) 1199 { 1200 wdev_lock(wdev); 1201 __cfg80211_leave(rdev, wdev); 1202 wdev_unlock(wdev); 1203 } 1204 1205 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 1206 gfp_t gfp) 1207 { 1208 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1209 struct cfg80211_event *ev; 1210 unsigned long flags; 1211 1212 trace_cfg80211_stop_iface(wiphy, wdev); 1213 1214 ev = kzalloc(sizeof(*ev), gfp); 1215 if (!ev) 1216 return; 1217 1218 ev->type = EVENT_STOPPED; 1219 1220 spin_lock_irqsave(&wdev->event_lock, flags); 1221 list_add_tail(&ev->list, &wdev->event_list); 1222 spin_unlock_irqrestore(&wdev->event_lock, flags); 1223 queue_work(cfg80211_wq, &rdev->event_work); 1224 } 1225 EXPORT_SYMBOL(cfg80211_stop_iface); 1226 1227 void cfg80211_init_wdev(struct cfg80211_registered_device *rdev, 1228 struct wireless_dev *wdev) 1229 { 1230 mutex_init(&wdev->mtx); 1231 INIT_LIST_HEAD(&wdev->event_list); 1232 spin_lock_init(&wdev->event_lock); 1233 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1234 spin_lock_init(&wdev->mgmt_registrations_lock); 1235 INIT_LIST_HEAD(&wdev->pmsr_list); 1236 spin_lock_init(&wdev->pmsr_lock); 1237 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk); 1238 1239 /* 1240 * We get here also when the interface changes network namespaces, 1241 * as it's registered into the new one, but we don't want it to 1242 * change ID in that case. Checking if the ID is already assigned 1243 * works, because 0 isn't considered a valid ID and the memory is 1244 * 0-initialized. 1245 */ 1246 if (!wdev->identifier) 1247 wdev->identifier = ++rdev->wdev_id; 1248 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list); 1249 rdev->devlist_generation++; 1250 1251 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 1252 } 1253 1254 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 1255 unsigned long state, void *ptr) 1256 { 1257 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1258 struct wireless_dev *wdev = dev->ieee80211_ptr; 1259 struct cfg80211_registered_device *rdev; 1260 struct cfg80211_sched_scan_request *pos, *tmp; 1261 1262 if (!wdev) 1263 return NOTIFY_DONE; 1264 1265 rdev = wiphy_to_rdev(wdev->wiphy); 1266 1267 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 1268 1269 switch (state) { 1270 case NETDEV_POST_INIT: 1271 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 1272 break; 1273 case NETDEV_REGISTER: 1274 /* 1275 * NB: cannot take rdev->mtx here because this may be 1276 * called within code protected by it when interfaces 1277 * are added with nl80211. 1278 */ 1279 /* can only change netns with wiphy */ 1280 dev->features |= NETIF_F_NETNS_LOCAL; 1281 1282 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 1283 "phy80211")) { 1284 pr_err("failed to add phy80211 symlink to netdev!\n"); 1285 } 1286 wdev->netdev = dev; 1287 #ifdef CONFIG_CFG80211_WEXT 1288 wdev->wext.default_key = -1; 1289 wdev->wext.default_mgmt_key = -1; 1290 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1291 #endif 1292 1293 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1294 wdev->ps = true; 1295 else 1296 wdev->ps = false; 1297 /* allow mac80211 to determine the timeout */ 1298 wdev->ps_timeout = -1; 1299 1300 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1301 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1302 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1303 dev->priv_flags |= IFF_DONT_BRIDGE; 1304 1305 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk); 1306 1307 cfg80211_init_wdev(rdev, wdev); 1308 break; 1309 case NETDEV_GOING_DOWN: 1310 cfg80211_leave(rdev, wdev); 1311 break; 1312 case NETDEV_DOWN: 1313 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1314 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1315 if (WARN_ON(!rdev->scan_req->notified)) 1316 rdev->scan_req->info.aborted = true; 1317 ___cfg80211_scan_done(rdev, false); 1318 } 1319 1320 list_for_each_entry_safe(pos, tmp, 1321 &rdev->sched_scan_req_list, list) { 1322 if (WARN_ON(pos->dev == wdev->netdev)) 1323 cfg80211_stop_sched_scan_req(rdev, pos, false); 1324 } 1325 1326 rdev->opencount--; 1327 wake_up(&rdev->dev_wait); 1328 break; 1329 case NETDEV_UP: 1330 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1331 wdev_lock(wdev); 1332 switch (wdev->iftype) { 1333 #ifdef CONFIG_CFG80211_WEXT 1334 case NL80211_IFTYPE_ADHOC: 1335 cfg80211_ibss_wext_join(rdev, wdev); 1336 break; 1337 case NL80211_IFTYPE_STATION: 1338 cfg80211_mgd_wext_connect(rdev, wdev); 1339 break; 1340 #endif 1341 #ifdef CONFIG_MAC80211_MESH 1342 case NL80211_IFTYPE_MESH_POINT: 1343 { 1344 /* backward compat code... */ 1345 struct mesh_setup setup; 1346 memcpy(&setup, &default_mesh_setup, 1347 sizeof(setup)); 1348 /* back compat only needed for mesh_id */ 1349 setup.mesh_id = wdev->ssid; 1350 setup.mesh_id_len = wdev->mesh_id_up_len; 1351 if (wdev->mesh_id_up_len) 1352 __cfg80211_join_mesh(rdev, dev, 1353 &setup, 1354 &default_mesh_config); 1355 break; 1356 } 1357 #endif 1358 default: 1359 break; 1360 } 1361 wdev_unlock(wdev); 1362 rdev->opencount++; 1363 1364 /* 1365 * Configure power management to the driver here so that its 1366 * correctly set also after interface type changes etc. 1367 */ 1368 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1369 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1370 rdev->ops->set_power_mgmt && 1371 rdev_set_power_mgmt(rdev, dev, wdev->ps, 1372 wdev->ps_timeout)) { 1373 /* assume this means it's off */ 1374 wdev->ps = false; 1375 } 1376 break; 1377 case NETDEV_UNREGISTER: 1378 /* 1379 * It is possible to get NETDEV_UNREGISTER 1380 * multiple times. To detect that, check 1381 * that the interface is still on the list 1382 * of registered interfaces, and only then 1383 * remove and clean it up. 1384 */ 1385 if (!list_empty(&wdev->list)) { 1386 __cfg80211_unregister_wdev(wdev, false); 1387 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 1388 } 1389 /* 1390 * synchronise (so that we won't find this netdev 1391 * from other code any more) and then clear the list 1392 * head so that the above code can safely check for 1393 * !list_empty() to avoid double-cleanup. 1394 */ 1395 synchronize_rcu(); 1396 INIT_LIST_HEAD(&wdev->list); 1397 /* 1398 * Ensure that all events have been processed and 1399 * freed. 1400 */ 1401 cfg80211_process_wdev_events(wdev); 1402 1403 if (WARN_ON(wdev->current_bss)) { 1404 cfg80211_unhold_bss(wdev->current_bss); 1405 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 1406 wdev->current_bss = NULL; 1407 } 1408 break; 1409 case NETDEV_PRE_UP: 1410 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype, 1411 wdev->use_4addr, 0)) 1412 return notifier_from_errno(-EOPNOTSUPP); 1413 1414 if (rfkill_blocked(rdev->rfkill)) 1415 return notifier_from_errno(-ERFKILL); 1416 break; 1417 default: 1418 return NOTIFY_DONE; 1419 } 1420 1421 wireless_nlevent_flush(); 1422 1423 return NOTIFY_OK; 1424 } 1425 1426 static struct notifier_block cfg80211_netdev_notifier = { 1427 .notifier_call = cfg80211_netdev_notifier_call, 1428 }; 1429 1430 static void __net_exit cfg80211_pernet_exit(struct net *net) 1431 { 1432 struct cfg80211_registered_device *rdev; 1433 1434 rtnl_lock(); 1435 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1436 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1437 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1438 } 1439 rtnl_unlock(); 1440 } 1441 1442 static struct pernet_operations cfg80211_pernet_ops = { 1443 .exit = cfg80211_pernet_exit, 1444 }; 1445 1446 static int __init cfg80211_init(void) 1447 { 1448 int err; 1449 1450 err = register_pernet_device(&cfg80211_pernet_ops); 1451 if (err) 1452 goto out_fail_pernet; 1453 1454 err = wiphy_sysfs_init(); 1455 if (err) 1456 goto out_fail_sysfs; 1457 1458 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1459 if (err) 1460 goto out_fail_notifier; 1461 1462 err = nl80211_init(); 1463 if (err) 1464 goto out_fail_nl80211; 1465 1466 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1467 1468 err = regulatory_init(); 1469 if (err) 1470 goto out_fail_reg; 1471 1472 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM); 1473 if (!cfg80211_wq) { 1474 err = -ENOMEM; 1475 goto out_fail_wq; 1476 } 1477 1478 return 0; 1479 1480 out_fail_wq: 1481 regulatory_exit(); 1482 out_fail_reg: 1483 debugfs_remove(ieee80211_debugfs_dir); 1484 nl80211_exit(); 1485 out_fail_nl80211: 1486 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1487 out_fail_notifier: 1488 wiphy_sysfs_exit(); 1489 out_fail_sysfs: 1490 unregister_pernet_device(&cfg80211_pernet_ops); 1491 out_fail_pernet: 1492 return err; 1493 } 1494 fs_initcall(cfg80211_init); 1495 1496 static void __exit cfg80211_exit(void) 1497 { 1498 debugfs_remove(ieee80211_debugfs_dir); 1499 nl80211_exit(); 1500 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1501 wiphy_sysfs_exit(); 1502 regulatory_exit(); 1503 unregister_pernet_device(&cfg80211_pernet_ops); 1504 destroy_workqueue(cfg80211_wq); 1505 } 1506 module_exit(cfg80211_exit); 1507