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) 2018-2021 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 37MODULE_AUTHOR("Johannes Berg"); 38MODULE_LICENSE("GPL"); 39MODULE_DESCRIPTION("wireless configuration support"); 40MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME); 41 42/* RCU-protected (and RTNL for writers) */ 43LIST_HEAD(cfg80211_rdev_list); 44int cfg80211_rdev_list_generation; 45 46/* for debugfs */ 47static struct dentry *ieee80211_debugfs_dir; 48 49/* for the cleanup, scan and event works */ 50struct workqueue_struct *cfg80211_wq; 51 52static bool cfg80211_disable_40mhz_24ghz; 53module_param(cfg80211_disable_40mhz_24ghz, bool, 0644); 54MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz, 55 "Disable 40MHz support in the 2.4GHz band"); 56 57struct 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 73int 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 80struct 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 92static 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 126int 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 155int 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 215static 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 222void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev, 223 struct wireless_dev *wdev) 224{ 225 ASSERT_RTNL(); 226 227 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE)) 228 return; 229 230 if (!wdev_running(wdev)) 231 return; 232 233 rdev_stop_p2p_device(rdev, wdev); 234 wdev->is_running = false; 235 236 rdev->opencount--; 237 238 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 239 if (WARN_ON(!rdev->scan_req->notified && 240 (!rdev->int_scan_req || 241 !rdev->int_scan_req->notified))) 242 rdev->scan_req->info.aborted = true; 243 ___cfg80211_scan_done(rdev, false); 244 } 245} 246 247void cfg80211_stop_nan(struct cfg80211_registered_device *rdev, 248 struct wireless_dev *wdev) 249{ 250 ASSERT_RTNL(); 251 252 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN)) 253 return; 254 255 if (!wdev_running(wdev)) 256 return; 257 258 rdev_stop_nan(rdev, wdev); 259 wdev->is_running = false; 260 261 rdev->opencount--; 262} 263 264void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy) 265{ 266 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 267 struct wireless_dev *wdev; 268 269 ASSERT_RTNL(); 270 271 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 272 if (wdev->netdev) { 273 dev_close(wdev->netdev); 274 continue; 275 } 276 /* otherwise, check iftype */ 277 switch (wdev->iftype) { 278 case NL80211_IFTYPE_P2P_DEVICE: 279 cfg80211_stop_p2p_device(rdev, wdev); 280 break; 281 case NL80211_IFTYPE_NAN: 282 cfg80211_stop_nan(rdev, wdev); 283 break; 284 default: 285 break; 286 } 287 } 288} 289EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces); 290 291static int cfg80211_rfkill_set_block(void *data, bool blocked) 292{ 293 struct cfg80211_registered_device *rdev = data; 294 295 if (!blocked) 296 return 0; 297 298 rtnl_lock(); 299 cfg80211_shutdown_all_interfaces(&rdev->wiphy); 300 rtnl_unlock(); 301 302 return 0; 303} 304 305static void cfg80211_rfkill_block_work(struct work_struct *work) 306{ 307 struct cfg80211_registered_device *rdev; 308 309 rdev = container_of(work, struct cfg80211_registered_device, 310 rfkill_block); 311 cfg80211_rfkill_set_block(rdev, true); 312} 313 314static void cfg80211_event_work(struct work_struct *work) 315{ 316 struct cfg80211_registered_device *rdev; 317 318 rdev = container_of(work, struct cfg80211_registered_device, 319 event_work); 320 321 rtnl_lock(); 322 cfg80211_process_rdev_events(rdev); 323 rtnl_unlock(); 324} 325 326void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev) 327{ 328 struct wireless_dev *wdev, *tmp; 329 330 ASSERT_RTNL(); 331 332 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) { 333 if (wdev->nl_owner_dead) 334 rdev_del_virtual_intf(rdev, wdev); 335 } 336} 337 338static void cfg80211_destroy_iface_wk(struct work_struct *work) 339{ 340 struct cfg80211_registered_device *rdev; 341 342 rdev = container_of(work, struct cfg80211_registered_device, 343 destroy_work); 344 345 rtnl_lock(); 346 cfg80211_destroy_ifaces(rdev); 347 rtnl_unlock(); 348} 349 350static void cfg80211_sched_scan_stop_wk(struct work_struct *work) 351{ 352 struct cfg80211_registered_device *rdev; 353 struct cfg80211_sched_scan_request *req, *tmp; 354 355 rdev = container_of(work, struct cfg80211_registered_device, 356 sched_scan_stop_wk); 357 358 rtnl_lock(); 359 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { 360 if (req->nl_owner_dead) 361 cfg80211_stop_sched_scan_req(rdev, req, false); 362 } 363 rtnl_unlock(); 364} 365 366static void cfg80211_propagate_radar_detect_wk(struct work_struct *work) 367{ 368 struct cfg80211_registered_device *rdev; 369 370 rdev = container_of(work, struct cfg80211_registered_device, 371 propagate_radar_detect_wk); 372 373 rtnl_lock(); 374 375 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef, 376 NL80211_DFS_UNAVAILABLE, 377 NL80211_RADAR_DETECTED); 378 379 rtnl_unlock(); 380} 381 382static void cfg80211_propagate_cac_done_wk(struct work_struct *work) 383{ 384 struct cfg80211_registered_device *rdev; 385 386 rdev = container_of(work, struct cfg80211_registered_device, 387 propagate_cac_done_wk); 388 389 rtnl_lock(); 390 391 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef, 392 NL80211_DFS_AVAILABLE, 393 NL80211_RADAR_CAC_FINISHED); 394 395 rtnl_unlock(); 396} 397 398/* exported functions */ 399 400struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, 401 const char *requested_name) 402{ 403 static atomic_t wiphy_counter = ATOMIC_INIT(0); 404 405 struct cfg80211_registered_device *rdev; 406 int alloc_size; 407 408 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 409 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 410 WARN_ON(ops->connect && !ops->disconnect); 411 WARN_ON(ops->join_ibss && !ops->leave_ibss); 412 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 413 WARN_ON(ops->add_station && !ops->del_station); 414 WARN_ON(ops->add_mpath && !ops->del_mpath); 415 WARN_ON(ops->join_mesh && !ops->leave_mesh); 416 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device); 417 WARN_ON(ops->start_ap && !ops->stop_ap); 418 WARN_ON(ops->join_ocb && !ops->leave_ocb); 419 WARN_ON(ops->suspend && !ops->resume); 420 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop); 421 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel); 422 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch); 423 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts); 424 425 alloc_size = sizeof(*rdev) + sizeof_priv; 426 427 rdev = kzalloc(alloc_size, GFP_KERNEL); 428 if (!rdev) 429 return NULL; 430 431 rdev->ops = ops; 432 433 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 434 435 if (unlikely(rdev->wiphy_idx < 0)) { 436 /* ugh, wrapped! */ 437 atomic_dec(&wiphy_counter); 438 kfree(rdev); 439 return NULL; 440 } 441 442 /* atomic_inc_return makes it start at 1, make it start at 0 */ 443 rdev->wiphy_idx--; 444 445 /* give it a proper name */ 446 if (requested_name && requested_name[0]) { 447 int rv; 448 449 rtnl_lock(); 450 rv = cfg80211_dev_check_name(rdev, requested_name); 451 452 if (rv < 0) { 453 rtnl_unlock(); 454 goto use_default_name; 455 } 456 457 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); 458 rtnl_unlock(); 459 if (rv) 460 goto use_default_name; 461 } else { 462 int rv; 463 464use_default_name: 465 /* NOTE: This is *probably* safe w/out holding rtnl because of 466 * the restrictions on phy names. Probably this call could 467 * fail if some other part of the kernel (re)named a device 468 * phyX. But, might should add some locking and check return 469 * value, and use a different name if this one exists? 470 */ 471 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 472 if (rv < 0) { 473 kfree(rdev); 474 return NULL; 475 } 476 } 477 478 INIT_LIST_HEAD(&rdev->wiphy.wdev_list); 479 INIT_LIST_HEAD(&rdev->beacon_registrations); 480 spin_lock_init(&rdev->beacon_registrations_lock); 481 spin_lock_init(&rdev->bss_lock); 482 INIT_LIST_HEAD(&rdev->bss_list); 483 INIT_LIST_HEAD(&rdev->sched_scan_req_list); 484 INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); 485 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 486 cfg80211_dfs_channels_update_work); 487#ifdef CONFIG_CFG80211_WEXT 488 rdev->wiphy.wext = &cfg80211_wext_handler; 489#endif 490 491 device_initialize(&rdev->wiphy.dev); 492 rdev->wiphy.dev.class = &ieee80211_class; 493 rdev->wiphy.dev.platform_data = rdev; 494 device_enable_async_suspend(&rdev->wiphy.dev); 495 496 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 497 INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 498 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk); 499 INIT_WORK(&rdev->propagate_radar_detect_wk, 500 cfg80211_propagate_radar_detect_wk); 501 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk); 502 INIT_WORK(&rdev->mgmt_registrations_update_wk, 503 cfg80211_mgmt_registrations_update_wk); 504 spin_lock_init(&rdev->mgmt_registrations_lock); 505 506#ifdef CONFIG_CFG80211_DEFAULT_PS 507 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 508#endif 509 510 wiphy_net_set(&rdev->wiphy, &init_net); 511 512 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 513 rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 514 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 515 &rdev->rfkill_ops, rdev); 516 517 if (!rdev->rfkill) { 518 wiphy_free(&rdev->wiphy); 519 return NULL; 520 } 521 522 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work); 523 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 524 INIT_WORK(&rdev->event_work, cfg80211_event_work); 525 526 init_waitqueue_head(&rdev->dev_wait); 527 528 /* 529 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 530 * Fragmentation and RTS threshold are disabled by default with the 531 * special -1 value. 532 */ 533 rdev->wiphy.retry_short = 7; 534 rdev->wiphy.retry_long = 4; 535 rdev->wiphy.frag_threshold = (u32) -1; 536 rdev->wiphy.rts_threshold = (u32) -1; 537 rdev->wiphy.coverage_class = 0; 538 539 rdev->wiphy.max_num_csa_counters = 1; 540 541 rdev->wiphy.max_sched_scan_plans = 1; 542 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 543 544 return &rdev->wiphy; 545} 546EXPORT_SYMBOL(wiphy_new_nm); 547 548static int wiphy_verify_combinations(struct wiphy *wiphy) 549{ 550 const struct ieee80211_iface_combination *c; 551 int i, j; 552 553 for (i = 0; i < wiphy->n_iface_combinations; i++) { 554 u32 cnt = 0; 555 u16 all_iftypes = 0; 556 557 c = &wiphy->iface_combinations[i]; 558 559 /* 560 * Combinations with just one interface aren't real, 561 * however we make an exception for DFS. 562 */ 563 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 564 return -EINVAL; 565 566 /* Need at least one channel */ 567 if (WARN_ON(!c->num_different_channels)) 568 return -EINVAL; 569 570 /* 571 * Put a sane limit on maximum number of different 572 * channels to simplify channel accounting code. 573 */ 574 if (WARN_ON(c->num_different_channels > 575 CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) 576 return -EINVAL; 577 578 /* DFS only works on one channel. */ 579 if (WARN_ON(c->radar_detect_widths && 580 (c->num_different_channels > 1))) 581 return -EINVAL; 582 583 if (WARN_ON(!c->n_limits)) 584 return -EINVAL; 585 586 for (j = 0; j < c->n_limits; j++) { 587 u16 types = c->limits[j].types; 588 589 /* interface types shouldn't overlap */ 590 if (WARN_ON(types & all_iftypes)) 591 return -EINVAL; 592 all_iftypes |= types; 593 594 if (WARN_ON(!c->limits[j].max)) 595 return -EINVAL; 596 597 /* Shouldn't list software iftypes in combinations! */ 598 if (WARN_ON(wiphy->software_iftypes & types)) 599 return -EINVAL; 600 601 /* Only a single P2P_DEVICE can be allowed */ 602 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 603 c->limits[j].max > 1)) 604 return -EINVAL; 605 606 /* Only a single NAN can be allowed */ 607 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) && 608 c->limits[j].max > 1)) 609 return -EINVAL; 610 611 /* 612 * This isn't well-defined right now. If you have an 613 * IBSS interface, then its beacon interval may change 614 * by joining other networks, and nothing prevents it 615 * from doing that. 616 * So technically we probably shouldn't even allow AP 617 * and IBSS in the same interface, but it seems that 618 * some drivers support that, possibly only with fixed 619 * beacon intervals for IBSS. 620 */ 621 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) && 622 c->beacon_int_min_gcd)) { 623 return -EINVAL; 624 } 625 626 cnt += c->limits[j].max; 627 /* 628 * Don't advertise an unsupported type 629 * in a combination. 630 */ 631 if (WARN_ON((wiphy->interface_modes & types) != types)) 632 return -EINVAL; 633 } 634 635#ifndef CONFIG_WIRELESS_WDS 636 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS))) 637 return -EINVAL; 638#endif 639 640 /* You can't even choose that many! */ 641 if (WARN_ON(cnt < c->max_interfaces)) 642 return -EINVAL; 643 } 644 645 return 0; 646} 647 648int wiphy_register(struct wiphy *wiphy) 649{ 650 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 651 int res; 652 enum nl80211_band band; 653 struct ieee80211_supported_band *sband; 654 bool have_band = false; 655 int i; 656 u16 ifmodes = wiphy->interface_modes; 657 658#ifdef CONFIG_PM 659 if (WARN_ON(wiphy->wowlan && 660 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 661 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 662 return -EINVAL; 663 if (WARN_ON(wiphy->wowlan && 664 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 665 !wiphy->wowlan->tcp)) 666 return -EINVAL; 667#endif 668 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 669 (!rdev->ops->tdls_channel_switch || 670 !rdev->ops->tdls_cancel_channel_switch))) 671 return -EINVAL; 672 673 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) && 674 (!rdev->ops->start_nan || !rdev->ops->stop_nan || 675 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func || 676 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ))))) 677 return -EINVAL; 678 679#ifndef CONFIG_WIRELESS_WDS 680 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))) 681 return -EINVAL; 682#endif 683 684 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported)) 685 return -EINVAL; 686 687 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) { 688 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap && 689 !wiphy->pmsr_capa->ftm.non_asap)) 690 return -EINVAL; 691 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles || 692 !wiphy->pmsr_capa->ftm.bandwidths)) 693 return -EINVAL; 694 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles & 695 ~(BIT(NL80211_PREAMBLE_LEGACY) | 696 BIT(NL80211_PREAMBLE_HT) | 697 BIT(NL80211_PREAMBLE_VHT) | 698 BIT(NL80211_PREAMBLE_HE) | 699 BIT(NL80211_PREAMBLE_DMG)))) 700 return -EINVAL; 701 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based || 702 wiphy->pmsr_capa->ftm.non_trigger_based) && 703 !(wiphy->pmsr_capa->ftm.preambles & 704 BIT(NL80211_PREAMBLE_HE)))) 705 return -EINVAL; 706 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths & 707 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) | 708 BIT(NL80211_CHAN_WIDTH_20) | 709 BIT(NL80211_CHAN_WIDTH_40) | 710 BIT(NL80211_CHAN_WIDTH_80) | 711 BIT(NL80211_CHAN_WIDTH_80P80) | 712 BIT(NL80211_CHAN_WIDTH_160) | 713 BIT(NL80211_CHAN_WIDTH_5) | 714 BIT(NL80211_CHAN_WIDTH_10)))) 715 return -EINVAL; 716 } 717 718 /* 719 * if a wiphy has unsupported modes for regulatory channel enforcement, 720 * opt-out of enforcement checking 721 */ 722 if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) | 723 BIT(NL80211_IFTYPE_P2P_CLIENT) | 724 BIT(NL80211_IFTYPE_AP) | 725 BIT(NL80211_IFTYPE_P2P_GO) | 726 BIT(NL80211_IFTYPE_ADHOC) | 727 BIT(NL80211_IFTYPE_P2P_DEVICE) | 728 BIT(NL80211_IFTYPE_NAN) | 729 BIT(NL80211_IFTYPE_AP_VLAN) | 730 BIT(NL80211_IFTYPE_MONITOR))) 731 wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF; 732 733 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 734 (wiphy->regulatory_flags & 735 (REGULATORY_CUSTOM_REG | 736 REGULATORY_STRICT_REG | 737 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 738 REGULATORY_COUNTRY_IE_IGNORE)))) 739 return -EINVAL; 740 741 if (WARN_ON(wiphy->coalesce && 742 (!wiphy->coalesce->n_rules || 743 !wiphy->coalesce->n_patterns) && 744 (!wiphy->coalesce->pattern_min_len || 745 wiphy->coalesce->pattern_min_len > 746 wiphy->coalesce->pattern_max_len))) 747 return -EINVAL; 748 749 if (WARN_ON(wiphy->ap_sme_capa && 750 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 751 return -EINVAL; 752 753 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 754 return -EINVAL; 755 756 if (WARN_ON(wiphy->addresses && 757 !is_zero_ether_addr(wiphy->perm_addr) && 758 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 759 ETH_ALEN))) 760 return -EINVAL; 761 762 if (WARN_ON(wiphy->max_acl_mac_addrs && 763 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 764 !rdev->ops->set_mac_acl))) 765 return -EINVAL; 766 767 /* assure only valid behaviours are flagged by driver 768 * hence subtract 2 as bit 0 is invalid. 769 */ 770 if (WARN_ON(wiphy->bss_select_support && 771 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 772 return -EINVAL; 773 774 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy, 775 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) && 776 (!rdev->ops->set_pmk || !rdev->ops->del_pmk))) 777 return -EINVAL; 778 779 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) && 780 rdev->ops->update_connect_params)) 781 return -EINVAL; 782 783 if (wiphy->addresses) 784 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 785 786 /* sanity check ifmodes */ 787 WARN_ON(!ifmodes); 788 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 789 if (WARN_ON(ifmodes != wiphy->interface_modes)) 790 wiphy->interface_modes = ifmodes; 791 792 res = wiphy_verify_combinations(wiphy); 793 if (res) 794 return res; 795 796 /* sanity check supported bands/channels */ 797 for (band = 0; band < NUM_NL80211_BANDS; band++) { 798 u16 types = 0; 799 bool have_he = false; 800 801 sband = wiphy->bands[band]; 802 if (!sband) 803 continue; 804 805 sband->band = band; 806 if (WARN_ON(!sband->n_channels)) 807 return -EINVAL; 808 /* 809 * on 60GHz or sub-1Ghz band, there are no legacy rates, so 810 * n_bitrates is 0 811 */ 812 if (WARN_ON((band != NL80211_BAND_60GHZ && 813 band != NL80211_BAND_S1GHZ) && 814 !sband->n_bitrates)) 815 return -EINVAL; 816 817 if (WARN_ON(band == NL80211_BAND_6GHZ && 818 (sband->ht_cap.ht_supported || 819 sband->vht_cap.vht_supported))) 820 return -EINVAL; 821 822 /* 823 * Since cfg80211_disable_40mhz_24ghz is global, we can 824 * modify the sband's ht data even if the driver uses a 825 * global structure for that. 826 */ 827 if (cfg80211_disable_40mhz_24ghz && 828 band == NL80211_BAND_2GHZ && 829 sband->ht_cap.ht_supported) { 830 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 831 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 832 } 833 834 /* 835 * Since we use a u32 for rate bitmaps in 836 * ieee80211_get_response_rate, we cannot 837 * have more than 32 legacy rates. 838 */ 839 if (WARN_ON(sband->n_bitrates > 32)) 840 return -EINVAL; 841 842 for (i = 0; i < sband->n_channels; i++) { 843 sband->channels[i].orig_flags = 844 sband->channels[i].flags; 845 sband->channels[i].orig_mag = INT_MAX; 846 sband->channels[i].orig_mpwr = 847 sband->channels[i].max_power; 848 sband->channels[i].band = band; 849 850 if (WARN_ON(sband->channels[i].freq_offset >= 1000)) 851 return -EINVAL; 852 } 853 854 for (i = 0; i < sband->n_iftype_data; i++) { 855 const struct ieee80211_sband_iftype_data *iftd; 856 857 iftd = &sband->iftype_data[i]; 858 859 if (WARN_ON(!iftd->types_mask)) 860 return -EINVAL; 861 if (WARN_ON(types & iftd->types_mask)) 862 return -EINVAL; 863 864 /* at least one piece of information must be present */ 865 if (WARN_ON(!iftd->he_cap.has_he)) 866 return -EINVAL; 867 868 types |= iftd->types_mask; 869 870 if (i == 0) 871 have_he = iftd->he_cap.has_he; 872 else 873 have_he = have_he && 874 iftd->he_cap.has_he; 875 } 876 877 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ)) 878 return -EINVAL; 879 880 have_band = true; 881 } 882 883 if (!have_band) { 884 WARN_ON(1); 885 return -EINVAL; 886 } 887 888 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) { 889 /* 890 * Validate we have a policy (can be explicitly set to 891 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that 892 * we have at least one of doit/dumpit. 893 */ 894 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy)) 895 return -EINVAL; 896 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit && 897 !rdev->wiphy.vendor_commands[i].dumpit)) 898 return -EINVAL; 899 } 900 901#ifdef CONFIG_PM 902 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 903 (!rdev->wiphy.wowlan->pattern_min_len || 904 rdev->wiphy.wowlan->pattern_min_len > 905 rdev->wiphy.wowlan->pattern_max_len))) 906 return -EINVAL; 907#endif 908 909 /* check and set up bitrates */ 910 ieee80211_set_bitrate_flags(wiphy); 911 912 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 913 914 rtnl_lock(); 915 res = device_add(&rdev->wiphy.dev); 916 if (res) { 917 rtnl_unlock(); 918 return res; 919 } 920 921 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 922 cfg80211_rdev_list_generation++; 923 924 /* add to debugfs */ 925 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy), 926 ieee80211_debugfs_dir); 927 928 cfg80211_debugfs_rdev_add(rdev); 929 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 930 931 /* set up regulatory info */ 932 wiphy_regulatory_register(wiphy); 933 934 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 935 struct regulatory_request request; 936 937 request.wiphy_idx = get_wiphy_idx(wiphy); 938 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 939 request.alpha2[0] = '9'; 940 request.alpha2[1] = '9'; 941 942 nl80211_send_reg_change_event(&request); 943 } 944 945 /* Check that nobody globally advertises any capabilities they do not 946 * advertise on all possible interface types. 947 */ 948 if (wiphy->extended_capabilities_len && 949 wiphy->num_iftype_ext_capab && 950 wiphy->iftype_ext_capab) { 951 u8 supported_on_all, j; 952 const struct wiphy_iftype_ext_capab *capab; 953 954 capab = wiphy->iftype_ext_capab; 955 for (j = 0; j < wiphy->extended_capabilities_len; j++) { 956 if (capab[0].extended_capabilities_len > j) 957 supported_on_all = 958 capab[0].extended_capabilities[j]; 959 else 960 supported_on_all = 0x00; 961 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) { 962 if (j >= capab[i].extended_capabilities_len) { 963 supported_on_all = 0x00; 964 break; 965 } 966 supported_on_all &= 967 capab[i].extended_capabilities[j]; 968 } 969 if (WARN_ON(wiphy->extended_capabilities[j] & 970 ~supported_on_all)) 971 break; 972 } 973 } 974 975 rdev->wiphy.registered = true; 976 rtnl_unlock(); 977 978 res = rfkill_register(rdev->rfkill); 979 if (res) { 980 rfkill_destroy(rdev->rfkill); 981 rdev->rfkill = NULL; 982 wiphy_unregister(&rdev->wiphy); 983 return res; 984 } 985 986 return 0; 987} 988EXPORT_SYMBOL(wiphy_register); 989 990void wiphy_rfkill_start_polling(struct wiphy *wiphy) 991{ 992 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 993 994 if (!rdev->ops->rfkill_poll) 995 return; 996 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 997 rfkill_resume_polling(rdev->rfkill); 998} 999EXPORT_SYMBOL(wiphy_rfkill_start_polling); 1000 1001void wiphy_rfkill_stop_polling(struct wiphy *wiphy) 1002{ 1003 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1004 1005 rfkill_pause_polling(rdev->rfkill); 1006} 1007EXPORT_SYMBOL(wiphy_rfkill_stop_polling); 1008 1009void wiphy_unregister(struct wiphy *wiphy) 1010{ 1011 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1012 1013 wait_event(rdev->dev_wait, ({ 1014 int __count; 1015 rtnl_lock(); 1016 __count = rdev->opencount; 1017 rtnl_unlock(); 1018 __count == 0; })); 1019 1020 if (rdev->rfkill) 1021 rfkill_unregister(rdev->rfkill); 1022 1023 rtnl_lock(); 1024 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 1025 rdev->wiphy.registered = false; 1026 1027 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 1028 1029 /* 1030 * First remove the hardware from everywhere, this makes 1031 * it impossible to find from userspace. 1032 */ 1033 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 1034 list_del_rcu(&rdev->list); 1035 synchronize_rcu(); 1036 1037 /* 1038 * If this device got a regulatory hint tell core its 1039 * free to listen now to a new shiny device regulatory hint 1040 */ 1041 wiphy_regulatory_deregister(wiphy); 1042 1043 cfg80211_rdev_list_generation++; 1044 device_del(&rdev->wiphy.dev); 1045 1046 rtnl_unlock(); 1047 1048 flush_work(&rdev->scan_done_wk); 1049 cancel_work_sync(&rdev->conn_work); 1050 flush_work(&rdev->event_work); 1051 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 1052 flush_work(&rdev->destroy_work); 1053 flush_work(&rdev->sched_scan_stop_wk); 1054 flush_work(&rdev->propagate_radar_detect_wk); 1055 flush_work(&rdev->propagate_cac_done_wk); 1056 flush_work(&rdev->mgmt_registrations_update_wk); 1057 1058#ifdef CONFIG_PM 1059 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 1060 rdev_set_wakeup(rdev, false); 1061#endif 1062 cfg80211_rdev_free_wowlan(rdev); 1063 cfg80211_rdev_free_coalesce(rdev); 1064} 1065EXPORT_SYMBOL(wiphy_unregister); 1066 1067void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 1068{ 1069 struct cfg80211_internal_bss *scan, *tmp; 1070 struct cfg80211_beacon_registration *reg, *treg; 1071 rfkill_destroy(rdev->rfkill); 1072 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 1073 list_del(®->list); 1074 kfree(reg); 1075 } 1076 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 1077 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 1078 kfree(rdev); 1079} 1080 1081void wiphy_free(struct wiphy *wiphy) 1082{ 1083 put_device(&wiphy->dev); 1084} 1085EXPORT_SYMBOL(wiphy_free); 1086 1087void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) 1088{ 1089 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1090 1091 if (rfkill_set_hw_state(rdev->rfkill, blocked)) 1092 schedule_work(&rdev->rfkill_block); 1093} 1094EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); 1095 1096void cfg80211_cqm_config_free(struct wireless_dev *wdev) 1097{ 1098 kfree(wdev->cqm_config); 1099 wdev->cqm_config = NULL; 1100} 1101 1102static void __cfg80211_unregister_wdev(struct wireless_dev *wdev, bool sync) 1103{ 1104 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1105 1106 ASSERT_RTNL(); 1107 1108 flush_work(&wdev->pmsr_free_wk); 1109 1110 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 1111 1112 list_del_rcu(&wdev->list); 1113 if (sync) 1114 synchronize_rcu(); 1115 rdev->devlist_generation++; 1116 1117 cfg80211_mlme_purge_registrations(wdev); 1118 1119 switch (wdev->iftype) { 1120 case NL80211_IFTYPE_P2P_DEVICE: 1121 cfg80211_stop_p2p_device(rdev, wdev); 1122 break; 1123 case NL80211_IFTYPE_NAN: 1124 cfg80211_stop_nan(rdev, wdev); 1125 break; 1126 default: 1127 break; 1128 } 1129 1130#ifdef CONFIG_CFG80211_WEXT 1131 kfree_sensitive(wdev->wext.keys); 1132 wdev->wext.keys = NULL; 1133#endif 1134 /* only initialized if we have a netdev */ 1135 if (wdev->netdev) 1136 flush_work(&wdev->disconnect_wk); 1137 1138 cfg80211_cqm_config_free(wdev); 1139} 1140 1141void cfg80211_unregister_wdev(struct wireless_dev *wdev) 1142{ 1143 if (WARN_ON(wdev->netdev)) 1144 return; 1145 1146 __cfg80211_unregister_wdev(wdev, true); 1147} 1148EXPORT_SYMBOL(cfg80211_unregister_wdev); 1149 1150static const struct device_type wiphy_type = { 1151 .name = "wlan", 1152}; 1153 1154void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 1155 enum nl80211_iftype iftype, int num) 1156{ 1157 ASSERT_RTNL(); 1158 1159 rdev->num_running_ifaces += num; 1160 if (iftype == NL80211_IFTYPE_MONITOR) 1161 rdev->num_running_monitor_ifaces += num; 1162} 1163 1164void __cfg80211_leave(struct cfg80211_registered_device *rdev, 1165 struct wireless_dev *wdev) 1166{ 1167 struct net_device *dev = wdev->netdev; 1168 struct cfg80211_sched_scan_request *pos, *tmp; 1169 1170 ASSERT_RTNL(); 1171 ASSERT_WDEV_LOCK(wdev); 1172 1173 cfg80211_pmsr_wdev_down(wdev); 1174 1175 switch (wdev->iftype) { 1176 case NL80211_IFTYPE_ADHOC: 1177 __cfg80211_leave_ibss(rdev, dev, true); 1178 break; 1179 case NL80211_IFTYPE_P2P_CLIENT: 1180 case NL80211_IFTYPE_STATION: 1181 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, 1182 list) { 1183 if (dev == pos->dev) 1184 cfg80211_stop_sched_scan_req(rdev, pos, false); 1185 } 1186 1187#ifdef CONFIG_CFG80211_WEXT 1188 kfree(wdev->wext.ie); 1189 wdev->wext.ie = NULL; 1190 wdev->wext.ie_len = 0; 1191 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1192#endif 1193 cfg80211_disconnect(rdev, dev, 1194 WLAN_REASON_DEAUTH_LEAVING, true); 1195 break; 1196 case NL80211_IFTYPE_MESH_POINT: 1197 __cfg80211_leave_mesh(rdev, dev); 1198 break; 1199 case NL80211_IFTYPE_AP: 1200 case NL80211_IFTYPE_P2P_GO: 1201 __cfg80211_stop_ap(rdev, dev, true); 1202 break; 1203 case NL80211_IFTYPE_OCB: 1204 __cfg80211_leave_ocb(rdev, dev); 1205 break; 1206 case NL80211_IFTYPE_WDS: 1207 /* must be handled by mac80211/driver, has no APIs */ 1208 break; 1209 case NL80211_IFTYPE_P2P_DEVICE: 1210 case NL80211_IFTYPE_NAN: 1211 /* cannot happen, has no netdev */ 1212 break; 1213 case NL80211_IFTYPE_AP_VLAN: 1214 case NL80211_IFTYPE_MONITOR: 1215 /* nothing to do */ 1216 break; 1217 case NL80211_IFTYPE_UNSPECIFIED: 1218 case NUM_NL80211_IFTYPES: 1219 /* invalid */ 1220 break; 1221 } 1222} 1223 1224void cfg80211_leave(struct cfg80211_registered_device *rdev, 1225 struct wireless_dev *wdev) 1226{ 1227 wdev_lock(wdev); 1228 __cfg80211_leave(rdev, wdev); 1229 wdev_unlock(wdev); 1230} 1231 1232void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 1233 gfp_t gfp) 1234{ 1235 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1236 struct cfg80211_event *ev; 1237 unsigned long flags; 1238 1239 trace_cfg80211_stop_iface(wiphy, wdev); 1240 1241 ev = kzalloc(sizeof(*ev), gfp); 1242 if (!ev) 1243 return; 1244 1245 ev->type = EVENT_STOPPED; 1246 1247 spin_lock_irqsave(&wdev->event_lock, flags); 1248 list_add_tail(&ev->list, &wdev->event_list); 1249 spin_unlock_irqrestore(&wdev->event_lock, flags); 1250 queue_work(cfg80211_wq, &rdev->event_work); 1251} 1252EXPORT_SYMBOL(cfg80211_stop_iface); 1253 1254void cfg80211_init_wdev(struct wireless_dev *wdev) 1255{ 1256 mutex_init(&wdev->mtx); 1257 INIT_LIST_HEAD(&wdev->event_list); 1258 spin_lock_init(&wdev->event_lock); 1259 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1260 INIT_LIST_HEAD(&wdev->pmsr_list); 1261 spin_lock_init(&wdev->pmsr_lock); 1262 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk); 1263 1264#ifdef CONFIG_CFG80211_WEXT 1265 wdev->wext.default_key = -1; 1266 wdev->wext.default_mgmt_key = -1; 1267 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1268#endif 1269 1270 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1271 wdev->ps = true; 1272 else 1273 wdev->ps = false; 1274 /* allow mac80211 to determine the timeout */ 1275 wdev->ps_timeout = -1; 1276 1277 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1278 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1279 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1280 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE; 1281 1282 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk); 1283} 1284 1285void cfg80211_register_wdev(struct cfg80211_registered_device *rdev, 1286 struct wireless_dev *wdev) 1287{ 1288 /* 1289 * We get here also when the interface changes network namespaces, 1290 * as it's registered into the new one, but we don't want it to 1291 * change ID in that case. Checking if the ID is already assigned 1292 * works, because 0 isn't considered a valid ID and the memory is 1293 * 0-initialized. 1294 */ 1295 if (!wdev->identifier) 1296 wdev->identifier = ++rdev->wdev_id; 1297 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list); 1298 rdev->devlist_generation++; 1299 1300 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 1301} 1302 1303static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 1304 unsigned long state, void *ptr) 1305{ 1306 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1307 struct wireless_dev *wdev = dev->ieee80211_ptr; 1308 struct cfg80211_registered_device *rdev; 1309 struct cfg80211_sched_scan_request *pos, *tmp; 1310 1311 if (!wdev) 1312 return NOTIFY_DONE; 1313 1314 rdev = wiphy_to_rdev(wdev->wiphy); 1315 1316 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 1317 1318 switch (state) { 1319 case NETDEV_POST_INIT: 1320 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 1321 wdev->netdev = dev; 1322 /* can only change netns with wiphy */ 1323 dev->features |= NETIF_F_NETNS_LOCAL; 1324 1325 cfg80211_init_wdev(wdev); 1326 break; 1327 case NETDEV_REGISTER: 1328 /* 1329 * NB: cannot take rdev->mtx here because this may be 1330 * called within code protected by it when interfaces 1331 * are added with nl80211. 1332 */ 1333 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, 1334 "phy80211")) { 1335 pr_err("failed to add phy80211 symlink to netdev!\n"); 1336 } 1337 1338 cfg80211_register_wdev(rdev, wdev); 1339 break; 1340 case NETDEV_GOING_DOWN: 1341 cfg80211_leave(rdev, wdev); 1342 break; 1343 case NETDEV_DOWN: 1344 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1345 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1346 if (WARN_ON(!rdev->scan_req->notified && 1347 (!rdev->int_scan_req || 1348 !rdev->int_scan_req->notified))) 1349 rdev->scan_req->info.aborted = true; 1350 ___cfg80211_scan_done(rdev, false); 1351 } 1352 1353 list_for_each_entry_safe(pos, tmp, 1354 &rdev->sched_scan_req_list, list) { 1355 if (WARN_ON(pos->dev == wdev->netdev)) 1356 cfg80211_stop_sched_scan_req(rdev, pos, false); 1357 } 1358 1359 rdev->opencount--; 1360 wake_up(&rdev->dev_wait); 1361 break; 1362 case NETDEV_UP: 1363 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1364 wdev_lock(wdev); 1365 switch (wdev->iftype) { 1366#ifdef CONFIG_CFG80211_WEXT 1367 case NL80211_IFTYPE_ADHOC: 1368 cfg80211_ibss_wext_join(rdev, wdev); 1369 break; 1370 case NL80211_IFTYPE_STATION: 1371 cfg80211_mgd_wext_connect(rdev, wdev); 1372 break; 1373#endif 1374#ifdef CONFIG_MAC80211_MESH 1375 case NL80211_IFTYPE_MESH_POINT: 1376 { 1377 /* backward compat code... */ 1378 struct mesh_setup setup; 1379 memcpy(&setup, &default_mesh_setup, 1380 sizeof(setup)); 1381 /* back compat only needed for mesh_id */ 1382 setup.mesh_id = wdev->ssid; 1383 setup.mesh_id_len = wdev->mesh_id_up_len; 1384 if (wdev->mesh_id_up_len) 1385 __cfg80211_join_mesh(rdev, dev, 1386 &setup, 1387 &default_mesh_config); 1388 break; 1389 } 1390#endif 1391 default: 1392 break; 1393 } 1394 wdev_unlock(wdev); 1395 rdev->opencount++; 1396 1397 /* 1398 * Configure power management to the driver here so that its 1399 * correctly set also after interface type changes etc. 1400 */ 1401 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1402 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1403 rdev->ops->set_power_mgmt && 1404 rdev_set_power_mgmt(rdev, dev, wdev->ps, 1405 wdev->ps_timeout)) { 1406 /* assume this means it's off */ 1407 wdev->ps = false; 1408 } 1409 break; 1410 case NETDEV_UNREGISTER: 1411 /* 1412 * It is possible to get NETDEV_UNREGISTER 1413 * multiple times. To detect that, check 1414 * that the interface is still on the list 1415 * of registered interfaces, and only then 1416 * remove and clean it up. 1417 */ 1418 if (!list_empty(&wdev->list)) { 1419 __cfg80211_unregister_wdev(wdev, false); 1420 sysfs_remove_link(&dev->dev.kobj, "phy80211"); 1421 } 1422 /* 1423 * synchronise (so that we won't find this netdev 1424 * from other code any more) and then clear the list 1425 * head so that the above code can safely check for 1426 * !list_empty() to avoid double-cleanup. 1427 */ 1428 synchronize_rcu(); 1429 INIT_LIST_HEAD(&wdev->list); 1430 /* 1431 * Ensure that all events have been processed and 1432 * freed. 1433 */ 1434 cfg80211_process_wdev_events(wdev); 1435 1436 if (WARN_ON(wdev->current_bss)) { 1437 cfg80211_unhold_bss(wdev->current_bss); 1438 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 1439 wdev->current_bss = NULL; 1440 } 1441 break; 1442 case NETDEV_PRE_UP: 1443 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype, 1444 wdev->use_4addr, 0)) 1445 return notifier_from_errno(-EOPNOTSUPP); 1446 1447 if (rfkill_blocked(rdev->rfkill)) 1448 return notifier_from_errno(-ERFKILL); 1449 break; 1450 default: 1451 return NOTIFY_DONE; 1452 } 1453 1454 wireless_nlevent_flush(); 1455 1456 return NOTIFY_OK; 1457} 1458 1459static struct notifier_block cfg80211_netdev_notifier = { 1460 .notifier_call = cfg80211_netdev_notifier_call, 1461}; 1462 1463static void __net_exit cfg80211_pernet_exit(struct net *net) 1464{ 1465 struct cfg80211_registered_device *rdev; 1466 1467 rtnl_lock(); 1468 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1469 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1470 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1471 } 1472 rtnl_unlock(); 1473} 1474 1475static struct pernet_operations cfg80211_pernet_ops = { 1476 .exit = cfg80211_pernet_exit, 1477}; 1478 1479static int __init cfg80211_init(void) 1480{ 1481 int err; 1482 1483 err = register_pernet_device(&cfg80211_pernet_ops); 1484 if (err) 1485 goto out_fail_pernet; 1486 1487 err = wiphy_sysfs_init(); 1488 if (err) 1489 goto out_fail_sysfs; 1490 1491 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1492 if (err) 1493 goto out_fail_notifier; 1494 1495 err = nl80211_init(); 1496 if (err) 1497 goto out_fail_nl80211; 1498 1499 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1500 1501 err = regulatory_init(); 1502 if (err) 1503 goto out_fail_reg; 1504 1505 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM); 1506 if (!cfg80211_wq) { 1507 err = -ENOMEM; 1508 goto out_fail_wq; 1509 } 1510 1511 return 0; 1512 1513out_fail_wq: 1514 regulatory_exit(); 1515out_fail_reg: 1516 debugfs_remove(ieee80211_debugfs_dir); 1517 nl80211_exit(); 1518out_fail_nl80211: 1519 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1520out_fail_notifier: 1521 wiphy_sysfs_exit(); 1522out_fail_sysfs: 1523 unregister_pernet_device(&cfg80211_pernet_ops); 1524out_fail_pernet: 1525 return err; 1526} 1527fs_initcall(cfg80211_init); 1528 1529static void __exit cfg80211_exit(void) 1530{ 1531 debugfs_remove(ieee80211_debugfs_dir); 1532 nl80211_exit(); 1533 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1534 wiphy_sysfs_exit(); 1535 regulatory_exit(); 1536 unregister_pernet_device(&cfg80211_pernet_ops); 1537 destroy_workqueue(cfg80211_wq); 1538} 1539module_exit(cfg80211_exit); 1540