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) 2018-2022 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 lockdep_assert_wiphy(&rdev->wiphy); 133 134 /* Ignore nop renames */ 135 if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0) 136 return 0; 137 138 result = cfg80211_dev_check_name(rdev, newname); 139 if (result < 0) 140 return result; 141 142 result = device_rename(&rdev->wiphy.dev, newname); 143 if (result) 144 return result; 145 146 if (!IS_ERR_OR_NULL(rdev->wiphy.debugfsdir)) 147 debugfs_rename(rdev->wiphy.debugfsdir->d_parent, 148 rdev->wiphy.debugfsdir, 149 rdev->wiphy.debugfsdir->d_parent, newname); 150 151 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 152 153 return 0; 154 } 155 156 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, 157 struct net *net) 158 { 159 struct wireless_dev *wdev; 160 int err = 0; 161 162 if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK)) 163 return -EOPNOTSUPP; 164 165 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 166 if (!wdev->netdev) 167 continue; 168 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 169 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); 170 if (err) 171 break; 172 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 173 } 174 175 if (err) { 176 /* failed -- clean up to old netns */ 177 net = wiphy_net(&rdev->wiphy); 178 179 list_for_each_entry_continue_reverse(wdev, 180 &rdev->wiphy.wdev_list, 181 list) { 182 if (!wdev->netdev) 183 continue; 184 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; 185 err = dev_change_net_namespace(wdev->netdev, net, 186 "wlan%d"); 187 WARN_ON(err); 188 wdev->netdev->features |= NETIF_F_NETNS_LOCAL; 189 } 190 191 return err; 192 } 193 194 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 195 if (!wdev->netdev) 196 continue; 197 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 198 } 199 200 wiphy_lock(&rdev->wiphy); 201 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 202 203 wiphy_net_set(&rdev->wiphy, net); 204 205 err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev)); 206 WARN_ON(err); 207 208 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 209 wiphy_unlock(&rdev->wiphy); 210 211 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 212 if (!wdev->netdev) 213 continue; 214 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 215 } 216 217 return 0; 218 } 219 220 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data) 221 { 222 struct cfg80211_registered_device *rdev = data; 223 224 wiphy_lock(&rdev->wiphy); 225 rdev_rfkill_poll(rdev); 226 wiphy_unlock(&rdev->wiphy); 227 } 228 229 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev, 230 struct wireless_dev *wdev) 231 { 232 lockdep_assert_held(&rdev->wiphy.mtx); 233 234 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE)) 235 return; 236 237 if (!wdev_running(wdev)) 238 return; 239 240 rdev_stop_p2p_device(rdev, wdev); 241 wdev->is_running = false; 242 243 rdev->opencount--; 244 245 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 246 if (WARN_ON(!rdev->scan_req->notified && 247 (!rdev->int_scan_req || 248 !rdev->int_scan_req->notified))) 249 rdev->scan_req->info.aborted = true; 250 ___cfg80211_scan_done(rdev, false); 251 } 252 } 253 254 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev, 255 struct wireless_dev *wdev) 256 { 257 lockdep_assert_held(&rdev->wiphy.mtx); 258 259 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN)) 260 return; 261 262 if (!wdev_running(wdev)) 263 return; 264 265 rdev_stop_nan(rdev, wdev); 266 wdev->is_running = false; 267 268 rdev->opencount--; 269 } 270 271 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy) 272 { 273 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 274 struct wireless_dev *wdev; 275 276 ASSERT_RTNL(); 277 278 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 279 if (wdev->netdev) { 280 dev_close(wdev->netdev); 281 continue; 282 } 283 284 /* otherwise, check iftype */ 285 286 wiphy_lock(wiphy); 287 288 switch (wdev->iftype) { 289 case NL80211_IFTYPE_P2P_DEVICE: 290 cfg80211_stop_p2p_device(rdev, wdev); 291 break; 292 case NL80211_IFTYPE_NAN: 293 cfg80211_stop_nan(rdev, wdev); 294 break; 295 default: 296 break; 297 } 298 299 wiphy_unlock(wiphy); 300 } 301 } 302 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces); 303 304 static int cfg80211_rfkill_set_block(void *data, bool blocked) 305 { 306 struct cfg80211_registered_device *rdev = data; 307 308 if (!blocked) 309 return 0; 310 311 rtnl_lock(); 312 cfg80211_shutdown_all_interfaces(&rdev->wiphy); 313 rtnl_unlock(); 314 315 return 0; 316 } 317 318 static void cfg80211_rfkill_block_work(struct work_struct *work) 319 { 320 struct cfg80211_registered_device *rdev; 321 322 rdev = container_of(work, struct cfg80211_registered_device, 323 rfkill_block); 324 cfg80211_rfkill_set_block(rdev, true); 325 } 326 327 static void cfg80211_event_work(struct work_struct *work) 328 { 329 struct cfg80211_registered_device *rdev; 330 331 rdev = container_of(work, struct cfg80211_registered_device, 332 event_work); 333 334 wiphy_lock(&rdev->wiphy); 335 cfg80211_process_rdev_events(rdev); 336 wiphy_unlock(&rdev->wiphy); 337 } 338 339 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev) 340 { 341 struct wireless_dev *wdev, *tmp; 342 343 ASSERT_RTNL(); 344 345 list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) { 346 if (wdev->nl_owner_dead) { 347 if (wdev->netdev) 348 dev_close(wdev->netdev); 349 350 wiphy_lock(&rdev->wiphy); 351 cfg80211_leave(rdev, wdev); 352 cfg80211_remove_virtual_intf(rdev, wdev); 353 wiphy_unlock(&rdev->wiphy); 354 } 355 } 356 } 357 358 static void cfg80211_destroy_iface_wk(struct work_struct *work) 359 { 360 struct cfg80211_registered_device *rdev; 361 362 rdev = container_of(work, struct cfg80211_registered_device, 363 destroy_work); 364 365 rtnl_lock(); 366 cfg80211_destroy_ifaces(rdev); 367 rtnl_unlock(); 368 } 369 370 static void cfg80211_sched_scan_stop_wk(struct wiphy *wiphy, 371 struct wiphy_work *work) 372 { 373 struct cfg80211_registered_device *rdev; 374 struct cfg80211_sched_scan_request *req, *tmp; 375 376 rdev = container_of(work, struct cfg80211_registered_device, 377 sched_scan_stop_wk); 378 379 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { 380 if (req->nl_owner_dead) 381 cfg80211_stop_sched_scan_req(rdev, req, false); 382 } 383 } 384 385 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work) 386 { 387 struct cfg80211_registered_device *rdev; 388 389 rdev = container_of(work, struct cfg80211_registered_device, 390 propagate_radar_detect_wk); 391 392 rtnl_lock(); 393 394 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef, 395 NL80211_DFS_UNAVAILABLE, 396 NL80211_RADAR_DETECTED); 397 398 rtnl_unlock(); 399 } 400 401 static void cfg80211_propagate_cac_done_wk(struct work_struct *work) 402 { 403 struct cfg80211_registered_device *rdev; 404 405 rdev = container_of(work, struct cfg80211_registered_device, 406 propagate_cac_done_wk); 407 408 rtnl_lock(); 409 410 regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef, 411 NL80211_DFS_AVAILABLE, 412 NL80211_RADAR_CAC_FINISHED); 413 414 rtnl_unlock(); 415 } 416 417 static void cfg80211_wiphy_work(struct work_struct *work) 418 { 419 struct cfg80211_registered_device *rdev; 420 struct wiphy_work *wk; 421 422 rdev = container_of(work, struct cfg80211_registered_device, wiphy_work); 423 424 wiphy_lock(&rdev->wiphy); 425 if (rdev->suspended) 426 goto out; 427 428 spin_lock_irq(&rdev->wiphy_work_lock); 429 wk = list_first_entry_or_null(&rdev->wiphy_work_list, 430 struct wiphy_work, entry); 431 if (wk) { 432 list_del_init(&wk->entry); 433 if (!list_empty(&rdev->wiphy_work_list)) 434 queue_work(system_unbound_wq, work); 435 spin_unlock_irq(&rdev->wiphy_work_lock); 436 437 wk->func(&rdev->wiphy, wk); 438 } else { 439 spin_unlock_irq(&rdev->wiphy_work_lock); 440 } 441 out: 442 wiphy_unlock(&rdev->wiphy); 443 } 444 445 /* exported functions */ 446 447 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, 448 const char *requested_name) 449 { 450 static atomic_t wiphy_counter = ATOMIC_INIT(0); 451 452 struct cfg80211_registered_device *rdev; 453 int alloc_size; 454 455 WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); 456 WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); 457 WARN_ON(ops->connect && !ops->disconnect); 458 WARN_ON(ops->join_ibss && !ops->leave_ibss); 459 WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); 460 WARN_ON(ops->add_station && !ops->del_station); 461 WARN_ON(ops->add_mpath && !ops->del_mpath); 462 WARN_ON(ops->join_mesh && !ops->leave_mesh); 463 WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device); 464 WARN_ON(ops->start_ap && !ops->stop_ap); 465 WARN_ON(ops->join_ocb && !ops->leave_ocb); 466 WARN_ON(ops->suspend && !ops->resume); 467 WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop); 468 WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel); 469 WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch); 470 WARN_ON(ops->add_tx_ts && !ops->del_tx_ts); 471 472 alloc_size = sizeof(*rdev) + sizeof_priv; 473 474 rdev = kzalloc(alloc_size, GFP_KERNEL); 475 if (!rdev) 476 return NULL; 477 478 rdev->ops = ops; 479 480 rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); 481 482 if (unlikely(rdev->wiphy_idx < 0)) { 483 /* ugh, wrapped! */ 484 atomic_dec(&wiphy_counter); 485 kfree(rdev); 486 return NULL; 487 } 488 489 /* atomic_inc_return makes it start at 1, make it start at 0 */ 490 rdev->wiphy_idx--; 491 492 /* give it a proper name */ 493 if (requested_name && requested_name[0]) { 494 int rv; 495 496 rtnl_lock(); 497 rv = cfg80211_dev_check_name(rdev, requested_name); 498 499 if (rv < 0) { 500 rtnl_unlock(); 501 goto use_default_name; 502 } 503 504 rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); 505 rtnl_unlock(); 506 if (rv) 507 goto use_default_name; 508 } else { 509 int rv; 510 511 use_default_name: 512 /* NOTE: This is *probably* safe w/out holding rtnl because of 513 * the restrictions on phy names. Probably this call could 514 * fail if some other part of the kernel (re)named a device 515 * phyX. But, might should add some locking and check return 516 * value, and use a different name if this one exists? 517 */ 518 rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); 519 if (rv < 0) { 520 kfree(rdev); 521 return NULL; 522 } 523 } 524 525 mutex_init(&rdev->wiphy.mtx); 526 INIT_LIST_HEAD(&rdev->wiphy.wdev_list); 527 INIT_LIST_HEAD(&rdev->beacon_registrations); 528 spin_lock_init(&rdev->beacon_registrations_lock); 529 spin_lock_init(&rdev->bss_lock); 530 INIT_LIST_HEAD(&rdev->bss_list); 531 INIT_LIST_HEAD(&rdev->sched_scan_req_list); 532 wiphy_work_init(&rdev->scan_done_wk, __cfg80211_scan_done); 533 INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, 534 cfg80211_dfs_channels_update_work); 535 #ifdef CONFIG_CFG80211_WEXT 536 rdev->wiphy.wext = &cfg80211_wext_handler; 537 #endif 538 539 device_initialize(&rdev->wiphy.dev); 540 rdev->wiphy.dev.class = &ieee80211_class; 541 rdev->wiphy.dev.platform_data = rdev; 542 device_enable_async_suspend(&rdev->wiphy.dev); 543 544 INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); 545 wiphy_work_init(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); 546 INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk); 547 INIT_WORK(&rdev->propagate_radar_detect_wk, 548 cfg80211_propagate_radar_detect_wk); 549 INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk); 550 INIT_WORK(&rdev->mgmt_registrations_update_wk, 551 cfg80211_mgmt_registrations_update_wk); 552 spin_lock_init(&rdev->mgmt_registrations_lock); 553 554 #ifdef CONFIG_CFG80211_DEFAULT_PS 555 rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; 556 #endif 557 558 wiphy_net_set(&rdev->wiphy, &init_net); 559 560 rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; 561 rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), 562 &rdev->wiphy.dev, RFKILL_TYPE_WLAN, 563 &rdev->rfkill_ops, rdev); 564 565 if (!rdev->wiphy.rfkill) { 566 wiphy_free(&rdev->wiphy); 567 return NULL; 568 } 569 570 INIT_WORK(&rdev->wiphy_work, cfg80211_wiphy_work); 571 INIT_LIST_HEAD(&rdev->wiphy_work_list); 572 spin_lock_init(&rdev->wiphy_work_lock); 573 INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work); 574 INIT_WORK(&rdev->conn_work, cfg80211_conn_work); 575 INIT_WORK(&rdev->event_work, cfg80211_event_work); 576 INIT_WORK(&rdev->background_cac_abort_wk, 577 cfg80211_background_cac_abort_wk); 578 INIT_DELAYED_WORK(&rdev->background_cac_done_wk, 579 cfg80211_background_cac_done_wk); 580 581 init_waitqueue_head(&rdev->dev_wait); 582 583 /* 584 * Initialize wiphy parameters to IEEE 802.11 MIB default values. 585 * Fragmentation and RTS threshold are disabled by default with the 586 * special -1 value. 587 */ 588 rdev->wiphy.retry_short = 7; 589 rdev->wiphy.retry_long = 4; 590 rdev->wiphy.frag_threshold = (u32) -1; 591 rdev->wiphy.rts_threshold = (u32) -1; 592 rdev->wiphy.coverage_class = 0; 593 594 rdev->wiphy.max_num_csa_counters = 1; 595 596 rdev->wiphy.max_sched_scan_plans = 1; 597 rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; 598 599 return &rdev->wiphy; 600 } 601 EXPORT_SYMBOL(wiphy_new_nm); 602 603 static int wiphy_verify_combinations(struct wiphy *wiphy) 604 { 605 const struct ieee80211_iface_combination *c; 606 int i, j; 607 608 for (i = 0; i < wiphy->n_iface_combinations; i++) { 609 u32 cnt = 0; 610 u16 all_iftypes = 0; 611 612 c = &wiphy->iface_combinations[i]; 613 614 /* 615 * Combinations with just one interface aren't real, 616 * however we make an exception for DFS. 617 */ 618 if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) 619 return -EINVAL; 620 621 /* Need at least one channel */ 622 if (WARN_ON(!c->num_different_channels)) 623 return -EINVAL; 624 625 /* DFS only works on one channel. */ 626 if (WARN_ON(c->radar_detect_widths && 627 (c->num_different_channels > 1))) 628 return -EINVAL; 629 630 if (WARN_ON(!c->n_limits)) 631 return -EINVAL; 632 633 for (j = 0; j < c->n_limits; j++) { 634 u16 types = c->limits[j].types; 635 636 /* interface types shouldn't overlap */ 637 if (WARN_ON(types & all_iftypes)) 638 return -EINVAL; 639 all_iftypes |= types; 640 641 if (WARN_ON(!c->limits[j].max)) 642 return -EINVAL; 643 644 /* Shouldn't list software iftypes in combinations! */ 645 if (WARN_ON(wiphy->software_iftypes & types)) 646 return -EINVAL; 647 648 /* Only a single P2P_DEVICE can be allowed */ 649 if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && 650 c->limits[j].max > 1)) 651 return -EINVAL; 652 653 /* Only a single NAN can be allowed */ 654 if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) && 655 c->limits[j].max > 1)) 656 return -EINVAL; 657 658 /* 659 * This isn't well-defined right now. If you have an 660 * IBSS interface, then its beacon interval may change 661 * by joining other networks, and nothing prevents it 662 * from doing that. 663 * So technically we probably shouldn't even allow AP 664 * and IBSS in the same interface, but it seems that 665 * some drivers support that, possibly only with fixed 666 * beacon intervals for IBSS. 667 */ 668 if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) && 669 c->beacon_int_min_gcd)) { 670 return -EINVAL; 671 } 672 673 cnt += c->limits[j].max; 674 /* 675 * Don't advertise an unsupported type 676 * in a combination. 677 */ 678 if (WARN_ON((wiphy->interface_modes & types) != types)) 679 return -EINVAL; 680 } 681 682 if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS))) 683 return -EINVAL; 684 685 /* You can't even choose that many! */ 686 if (WARN_ON(cnt < c->max_interfaces)) 687 return -EINVAL; 688 } 689 690 return 0; 691 } 692 693 int wiphy_register(struct wiphy *wiphy) 694 { 695 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 696 int res; 697 enum nl80211_band band; 698 struct ieee80211_supported_band *sband; 699 bool have_band = false; 700 int i; 701 u16 ifmodes = wiphy->interface_modes; 702 703 #ifdef CONFIG_PM 704 if (WARN_ON(wiphy->wowlan && 705 (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && 706 !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) 707 return -EINVAL; 708 if (WARN_ON(wiphy->wowlan && 709 !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && 710 !wiphy->wowlan->tcp)) 711 return -EINVAL; 712 #endif 713 if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && 714 (!rdev->ops->tdls_channel_switch || 715 !rdev->ops->tdls_cancel_channel_switch))) 716 return -EINVAL; 717 718 if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) && 719 (!rdev->ops->start_nan || !rdev->ops->stop_nan || 720 !rdev->ops->add_nan_func || !rdev->ops->del_nan_func || 721 !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ))))) 722 return -EINVAL; 723 724 if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))) 725 return -EINVAL; 726 727 if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported)) 728 return -EINVAL; 729 730 if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) { 731 if (WARN_ON(!wiphy->pmsr_capa->ftm.asap && 732 !wiphy->pmsr_capa->ftm.non_asap)) 733 return -EINVAL; 734 if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles || 735 !wiphy->pmsr_capa->ftm.bandwidths)) 736 return -EINVAL; 737 if (WARN_ON(wiphy->pmsr_capa->ftm.preambles & 738 ~(BIT(NL80211_PREAMBLE_LEGACY) | 739 BIT(NL80211_PREAMBLE_HT) | 740 BIT(NL80211_PREAMBLE_VHT) | 741 BIT(NL80211_PREAMBLE_HE) | 742 BIT(NL80211_PREAMBLE_DMG)))) 743 return -EINVAL; 744 if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based || 745 wiphy->pmsr_capa->ftm.non_trigger_based) && 746 !(wiphy->pmsr_capa->ftm.preambles & 747 BIT(NL80211_PREAMBLE_HE)))) 748 return -EINVAL; 749 if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths & 750 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) | 751 BIT(NL80211_CHAN_WIDTH_20) | 752 BIT(NL80211_CHAN_WIDTH_40) | 753 BIT(NL80211_CHAN_WIDTH_80) | 754 BIT(NL80211_CHAN_WIDTH_80P80) | 755 BIT(NL80211_CHAN_WIDTH_160) | 756 BIT(NL80211_CHAN_WIDTH_5) | 757 BIT(NL80211_CHAN_WIDTH_10)))) 758 return -EINVAL; 759 } 760 761 if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && 762 (wiphy->regulatory_flags & 763 (REGULATORY_CUSTOM_REG | 764 REGULATORY_STRICT_REG | 765 REGULATORY_COUNTRY_IE_FOLLOW_POWER | 766 REGULATORY_COUNTRY_IE_IGNORE)))) 767 return -EINVAL; 768 769 if (WARN_ON(wiphy->coalesce && 770 (!wiphy->coalesce->n_rules || 771 !wiphy->coalesce->n_patterns) && 772 (!wiphy->coalesce->pattern_min_len || 773 wiphy->coalesce->pattern_min_len > 774 wiphy->coalesce->pattern_max_len))) 775 return -EINVAL; 776 777 if (WARN_ON(wiphy->ap_sme_capa && 778 !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) 779 return -EINVAL; 780 781 if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) 782 return -EINVAL; 783 784 if (WARN_ON(wiphy->addresses && 785 !is_zero_ether_addr(wiphy->perm_addr) && 786 memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, 787 ETH_ALEN))) 788 return -EINVAL; 789 790 if (WARN_ON(wiphy->max_acl_mac_addrs && 791 (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || 792 !rdev->ops->set_mac_acl))) 793 return -EINVAL; 794 795 /* assure only valid behaviours are flagged by driver 796 * hence subtract 2 as bit 0 is invalid. 797 */ 798 if (WARN_ON(wiphy->bss_select_support && 799 (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) 800 return -EINVAL; 801 802 if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy, 803 NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) && 804 (!rdev->ops->set_pmk || !rdev->ops->del_pmk))) 805 return -EINVAL; 806 807 if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) && 808 rdev->ops->update_connect_params)) 809 return -EINVAL; 810 811 if (wiphy->addresses) 812 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); 813 814 /* sanity check ifmodes */ 815 WARN_ON(!ifmodes); 816 ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; 817 if (WARN_ON(ifmodes != wiphy->interface_modes)) 818 wiphy->interface_modes = ifmodes; 819 820 res = wiphy_verify_combinations(wiphy); 821 if (res) 822 return res; 823 824 /* sanity check supported bands/channels */ 825 for (band = 0; band < NUM_NL80211_BANDS; band++) { 826 u16 types = 0; 827 bool have_he = false; 828 829 sband = wiphy->bands[band]; 830 if (!sband) 831 continue; 832 833 sband->band = band; 834 if (WARN_ON(!sband->n_channels)) 835 return -EINVAL; 836 /* 837 * on 60GHz or sub-1Ghz band, there are no legacy rates, so 838 * n_bitrates is 0 839 */ 840 if (WARN_ON((band != NL80211_BAND_60GHZ && 841 band != NL80211_BAND_S1GHZ) && 842 !sband->n_bitrates)) 843 return -EINVAL; 844 845 if (WARN_ON(band == NL80211_BAND_6GHZ && 846 (sband->ht_cap.ht_supported || 847 sband->vht_cap.vht_supported))) 848 return -EINVAL; 849 850 /* 851 * Since cfg80211_disable_40mhz_24ghz is global, we can 852 * modify the sband's ht data even if the driver uses a 853 * global structure for that. 854 */ 855 if (cfg80211_disable_40mhz_24ghz && 856 band == NL80211_BAND_2GHZ && 857 sband->ht_cap.ht_supported) { 858 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 859 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 860 } 861 862 /* 863 * Since we use a u32 for rate bitmaps in 864 * ieee80211_get_response_rate, we cannot 865 * have more than 32 legacy rates. 866 */ 867 if (WARN_ON(sband->n_bitrates > 32)) 868 return -EINVAL; 869 870 for (i = 0; i < sband->n_channels; i++) { 871 sband->channels[i].orig_flags = 872 sband->channels[i].flags; 873 sband->channels[i].orig_mag = INT_MAX; 874 sband->channels[i].orig_mpwr = 875 sband->channels[i].max_power; 876 sband->channels[i].band = band; 877 878 if (WARN_ON(sband->channels[i].freq_offset >= 1000)) 879 return -EINVAL; 880 } 881 882 for (i = 0; i < sband->n_iftype_data; i++) { 883 const struct ieee80211_sband_iftype_data *iftd; 884 bool has_ap, has_non_ap; 885 u32 ap_bits = BIT(NL80211_IFTYPE_AP) | 886 BIT(NL80211_IFTYPE_P2P_GO); 887 888 iftd = &sband->iftype_data[i]; 889 890 if (WARN_ON(!iftd->types_mask)) 891 return -EINVAL; 892 if (WARN_ON(types & iftd->types_mask)) 893 return -EINVAL; 894 895 /* at least one piece of information must be present */ 896 if (WARN_ON(!iftd->he_cap.has_he)) 897 return -EINVAL; 898 899 types |= iftd->types_mask; 900 901 if (i == 0) 902 have_he = iftd->he_cap.has_he; 903 else 904 have_he = have_he && 905 iftd->he_cap.has_he; 906 907 has_ap = iftd->types_mask & ap_bits; 908 has_non_ap = iftd->types_mask & ~ap_bits; 909 910 /* 911 * For EHT 20 MHz STA, the capabilities format differs 912 * but to simplify, don't check 20 MHz but rather check 913 * only if AP and non-AP were mentioned at the same time, 914 * reject if so. 915 */ 916 if (WARN_ON(iftd->eht_cap.has_eht && 917 has_ap && has_non_ap)) 918 return -EINVAL; 919 } 920 921 if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ)) 922 return -EINVAL; 923 924 have_band = true; 925 } 926 927 if (!have_band) { 928 WARN_ON(1); 929 return -EINVAL; 930 } 931 932 for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) { 933 /* 934 * Validate we have a policy (can be explicitly set to 935 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that 936 * we have at least one of doit/dumpit. 937 */ 938 if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy)) 939 return -EINVAL; 940 if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit && 941 !rdev->wiphy.vendor_commands[i].dumpit)) 942 return -EINVAL; 943 } 944 945 #ifdef CONFIG_PM 946 if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && 947 (!rdev->wiphy.wowlan->pattern_min_len || 948 rdev->wiphy.wowlan->pattern_min_len > 949 rdev->wiphy.wowlan->pattern_max_len))) 950 return -EINVAL; 951 #endif 952 953 if (!wiphy->max_num_akm_suites) 954 wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES; 955 else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES || 956 wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES) 957 return -EINVAL; 958 959 /* check and set up bitrates */ 960 ieee80211_set_bitrate_flags(wiphy); 961 962 rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; 963 964 rtnl_lock(); 965 wiphy_lock(&rdev->wiphy); 966 res = device_add(&rdev->wiphy.dev); 967 if (res) { 968 wiphy_unlock(&rdev->wiphy); 969 rtnl_unlock(); 970 return res; 971 } 972 973 list_add_rcu(&rdev->list, &cfg80211_rdev_list); 974 cfg80211_rdev_list_generation++; 975 976 /* add to debugfs */ 977 rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy), 978 ieee80211_debugfs_dir); 979 980 cfg80211_debugfs_rdev_add(rdev); 981 nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 982 wiphy_unlock(&rdev->wiphy); 983 984 /* set up regulatory info */ 985 wiphy_regulatory_register(wiphy); 986 987 if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 988 struct regulatory_request request; 989 990 request.wiphy_idx = get_wiphy_idx(wiphy); 991 request.initiator = NL80211_REGDOM_SET_BY_DRIVER; 992 request.alpha2[0] = '9'; 993 request.alpha2[1] = '9'; 994 995 nl80211_send_reg_change_event(&request); 996 } 997 998 /* Check that nobody globally advertises any capabilities they do not 999 * advertise on all possible interface types. 1000 */ 1001 if (wiphy->extended_capabilities_len && 1002 wiphy->num_iftype_ext_capab && 1003 wiphy->iftype_ext_capab) { 1004 u8 supported_on_all, j; 1005 const struct wiphy_iftype_ext_capab *capab; 1006 1007 capab = wiphy->iftype_ext_capab; 1008 for (j = 0; j < wiphy->extended_capabilities_len; j++) { 1009 if (capab[0].extended_capabilities_len > j) 1010 supported_on_all = 1011 capab[0].extended_capabilities[j]; 1012 else 1013 supported_on_all = 0x00; 1014 for (i = 1; i < wiphy->num_iftype_ext_capab; i++) { 1015 if (j >= capab[i].extended_capabilities_len) { 1016 supported_on_all = 0x00; 1017 break; 1018 } 1019 supported_on_all &= 1020 capab[i].extended_capabilities[j]; 1021 } 1022 if (WARN_ON(wiphy->extended_capabilities[j] & 1023 ~supported_on_all)) 1024 break; 1025 } 1026 } 1027 1028 rdev->wiphy.registered = true; 1029 rtnl_unlock(); 1030 1031 res = rfkill_register(rdev->wiphy.rfkill); 1032 if (res) { 1033 rfkill_destroy(rdev->wiphy.rfkill); 1034 rdev->wiphy.rfkill = NULL; 1035 wiphy_unregister(&rdev->wiphy); 1036 return res; 1037 } 1038 1039 return 0; 1040 } 1041 EXPORT_SYMBOL(wiphy_register); 1042 1043 void wiphy_rfkill_start_polling(struct wiphy *wiphy) 1044 { 1045 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1046 1047 if (!rdev->ops->rfkill_poll) 1048 return; 1049 rdev->rfkill_ops.poll = cfg80211_rfkill_poll; 1050 rfkill_resume_polling(wiphy->rfkill); 1051 } 1052 EXPORT_SYMBOL(wiphy_rfkill_start_polling); 1053 1054 void cfg80211_process_wiphy_works(struct cfg80211_registered_device *rdev, 1055 struct wiphy_work *end) 1056 { 1057 unsigned int runaway_limit = 100; 1058 unsigned long flags; 1059 1060 lockdep_assert_held(&rdev->wiphy.mtx); 1061 1062 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1063 while (!list_empty(&rdev->wiphy_work_list)) { 1064 struct wiphy_work *wk; 1065 1066 wk = list_first_entry(&rdev->wiphy_work_list, 1067 struct wiphy_work, entry); 1068 list_del_init(&wk->entry); 1069 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1070 1071 wk->func(&rdev->wiphy, wk); 1072 1073 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1074 1075 if (wk == end) 1076 break; 1077 1078 if (WARN_ON(--runaway_limit == 0)) 1079 INIT_LIST_HEAD(&rdev->wiphy_work_list); 1080 } 1081 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1082 } 1083 1084 void wiphy_unregister(struct wiphy *wiphy) 1085 { 1086 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1087 1088 wait_event(rdev->dev_wait, ({ 1089 int __count; 1090 wiphy_lock(&rdev->wiphy); 1091 __count = rdev->opencount; 1092 wiphy_unlock(&rdev->wiphy); 1093 __count == 0; })); 1094 1095 if (rdev->wiphy.rfkill) 1096 rfkill_unregister(rdev->wiphy.rfkill); 1097 1098 rtnl_lock(); 1099 wiphy_lock(&rdev->wiphy); 1100 nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); 1101 rdev->wiphy.registered = false; 1102 1103 WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); 1104 1105 /* 1106 * First remove the hardware from everywhere, this makes 1107 * it impossible to find from userspace. 1108 */ 1109 debugfs_remove_recursive(rdev->wiphy.debugfsdir); 1110 list_del_rcu(&rdev->list); 1111 synchronize_rcu(); 1112 1113 /* 1114 * If this device got a regulatory hint tell core its 1115 * free to listen now to a new shiny device regulatory hint 1116 */ 1117 wiphy_regulatory_deregister(wiphy); 1118 1119 cfg80211_rdev_list_generation++; 1120 device_del(&rdev->wiphy.dev); 1121 1122 #ifdef CONFIG_PM 1123 if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) 1124 rdev_set_wakeup(rdev, false); 1125 #endif 1126 1127 /* surely nothing is reachable now, clean up work */ 1128 cfg80211_process_wiphy_works(rdev, NULL); 1129 wiphy_unlock(&rdev->wiphy); 1130 rtnl_unlock(); 1131 1132 /* this has nothing to do now but make sure it's gone */ 1133 cancel_work_sync(&rdev->wiphy_work); 1134 1135 cancel_work_sync(&rdev->conn_work); 1136 flush_work(&rdev->event_work); 1137 cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); 1138 cancel_delayed_work_sync(&rdev->background_cac_done_wk); 1139 flush_work(&rdev->destroy_work); 1140 flush_work(&rdev->propagate_radar_detect_wk); 1141 flush_work(&rdev->propagate_cac_done_wk); 1142 flush_work(&rdev->mgmt_registrations_update_wk); 1143 flush_work(&rdev->background_cac_abort_wk); 1144 1145 cfg80211_rdev_free_wowlan(rdev); 1146 cfg80211_rdev_free_coalesce(rdev); 1147 } 1148 EXPORT_SYMBOL(wiphy_unregister); 1149 1150 void cfg80211_dev_free(struct cfg80211_registered_device *rdev) 1151 { 1152 struct cfg80211_internal_bss *scan, *tmp; 1153 struct cfg80211_beacon_registration *reg, *treg; 1154 rfkill_destroy(rdev->wiphy.rfkill); 1155 list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { 1156 list_del(®->list); 1157 kfree(reg); 1158 } 1159 list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) 1160 cfg80211_put_bss(&rdev->wiphy, &scan->pub); 1161 mutex_destroy(&rdev->wiphy.mtx); 1162 1163 /* 1164 * The 'regd' can only be non-NULL if we never finished 1165 * initializing the wiphy and thus never went through the 1166 * unregister path - e.g. in failure scenarios. Thus, it 1167 * cannot have been visible to anyone if non-NULL, so we 1168 * can just free it here. 1169 */ 1170 kfree(rcu_dereference_raw(rdev->wiphy.regd)); 1171 1172 kfree(rdev); 1173 } 1174 1175 void wiphy_free(struct wiphy *wiphy) 1176 { 1177 put_device(&wiphy->dev); 1178 } 1179 EXPORT_SYMBOL(wiphy_free); 1180 1181 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked, 1182 enum rfkill_hard_block_reasons reason) 1183 { 1184 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1185 1186 if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason)) 1187 schedule_work(&rdev->rfkill_block); 1188 } 1189 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason); 1190 1191 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev, 1192 bool unregister_netdev) 1193 { 1194 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1195 struct cfg80211_cqm_config *cqm_config; 1196 unsigned int link_id; 1197 1198 ASSERT_RTNL(); 1199 lockdep_assert_held(&rdev->wiphy.mtx); 1200 1201 nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); 1202 1203 wdev->registered = false; 1204 1205 if (wdev->netdev) { 1206 sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211"); 1207 if (unregister_netdev) 1208 unregister_netdevice(wdev->netdev); 1209 } 1210 1211 list_del_rcu(&wdev->list); 1212 synchronize_net(); 1213 rdev->devlist_generation++; 1214 1215 cfg80211_mlme_purge_registrations(wdev); 1216 1217 switch (wdev->iftype) { 1218 case NL80211_IFTYPE_P2P_DEVICE: 1219 cfg80211_stop_p2p_device(rdev, wdev); 1220 break; 1221 case NL80211_IFTYPE_NAN: 1222 cfg80211_stop_nan(rdev, wdev); 1223 break; 1224 default: 1225 break; 1226 } 1227 1228 #ifdef CONFIG_CFG80211_WEXT 1229 kfree_sensitive(wdev->wext.keys); 1230 wdev->wext.keys = NULL; 1231 #endif 1232 wiphy_work_cancel(wdev->wiphy, &wdev->cqm_rssi_work); 1233 /* deleted from the list, so can't be found from nl80211 any more */ 1234 cqm_config = rcu_access_pointer(wdev->cqm_config); 1235 kfree_rcu(cqm_config, rcu_head); 1236 1237 /* 1238 * Ensure that all events have been processed and 1239 * freed. 1240 */ 1241 cfg80211_process_wdev_events(wdev); 1242 1243 if (wdev->iftype == NL80211_IFTYPE_STATION || 1244 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) { 1245 for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) { 1246 struct cfg80211_internal_bss *curbss; 1247 1248 curbss = wdev->links[link_id].client.current_bss; 1249 1250 if (WARN_ON(curbss)) { 1251 cfg80211_unhold_bss(curbss); 1252 cfg80211_put_bss(wdev->wiphy, &curbss->pub); 1253 wdev->links[link_id].client.current_bss = NULL; 1254 } 1255 } 1256 } 1257 1258 wdev->connected = false; 1259 } 1260 1261 void cfg80211_unregister_wdev(struct wireless_dev *wdev) 1262 { 1263 _cfg80211_unregister_wdev(wdev, true); 1264 } 1265 EXPORT_SYMBOL(cfg80211_unregister_wdev); 1266 1267 static const struct device_type wiphy_type = { 1268 .name = "wlan", 1269 }; 1270 1271 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, 1272 enum nl80211_iftype iftype, int num) 1273 { 1274 lockdep_assert_held(&rdev->wiphy.mtx); 1275 1276 rdev->num_running_ifaces += num; 1277 if (iftype == NL80211_IFTYPE_MONITOR) 1278 rdev->num_running_monitor_ifaces += num; 1279 } 1280 1281 void __cfg80211_leave(struct cfg80211_registered_device *rdev, 1282 struct wireless_dev *wdev) 1283 { 1284 struct net_device *dev = wdev->netdev; 1285 struct cfg80211_sched_scan_request *pos, *tmp; 1286 1287 lockdep_assert_held(&rdev->wiphy.mtx); 1288 ASSERT_WDEV_LOCK(wdev); 1289 1290 cfg80211_pmsr_wdev_down(wdev); 1291 1292 cfg80211_stop_background_radar_detection(wdev); 1293 1294 switch (wdev->iftype) { 1295 case NL80211_IFTYPE_ADHOC: 1296 __cfg80211_leave_ibss(rdev, dev, true); 1297 break; 1298 case NL80211_IFTYPE_P2P_CLIENT: 1299 case NL80211_IFTYPE_STATION: 1300 list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, 1301 list) { 1302 if (dev == pos->dev) 1303 cfg80211_stop_sched_scan_req(rdev, pos, false); 1304 } 1305 1306 #ifdef CONFIG_CFG80211_WEXT 1307 kfree(wdev->wext.ie); 1308 wdev->wext.ie = NULL; 1309 wdev->wext.ie_len = 0; 1310 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1311 #endif 1312 cfg80211_disconnect(rdev, dev, 1313 WLAN_REASON_DEAUTH_LEAVING, true); 1314 break; 1315 case NL80211_IFTYPE_MESH_POINT: 1316 __cfg80211_leave_mesh(rdev, dev); 1317 break; 1318 case NL80211_IFTYPE_AP: 1319 case NL80211_IFTYPE_P2P_GO: 1320 __cfg80211_stop_ap(rdev, dev, -1, true); 1321 break; 1322 case NL80211_IFTYPE_OCB: 1323 __cfg80211_leave_ocb(rdev, dev); 1324 break; 1325 case NL80211_IFTYPE_P2P_DEVICE: 1326 case NL80211_IFTYPE_NAN: 1327 /* cannot happen, has no netdev */ 1328 break; 1329 case NL80211_IFTYPE_AP_VLAN: 1330 case NL80211_IFTYPE_MONITOR: 1331 /* nothing to do */ 1332 break; 1333 case NL80211_IFTYPE_UNSPECIFIED: 1334 case NL80211_IFTYPE_WDS: 1335 case NUM_NL80211_IFTYPES: 1336 /* invalid */ 1337 break; 1338 } 1339 } 1340 1341 void cfg80211_leave(struct cfg80211_registered_device *rdev, 1342 struct wireless_dev *wdev) 1343 { 1344 wdev_lock(wdev); 1345 __cfg80211_leave(rdev, wdev); 1346 wdev_unlock(wdev); 1347 } 1348 1349 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, 1350 gfp_t gfp) 1351 { 1352 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1353 struct cfg80211_event *ev; 1354 unsigned long flags; 1355 1356 trace_cfg80211_stop_iface(wiphy, wdev); 1357 1358 ev = kzalloc(sizeof(*ev), gfp); 1359 if (!ev) 1360 return; 1361 1362 ev->type = EVENT_STOPPED; 1363 1364 spin_lock_irqsave(&wdev->event_lock, flags); 1365 list_add_tail(&ev->list, &wdev->event_list); 1366 spin_unlock_irqrestore(&wdev->event_lock, flags); 1367 queue_work(cfg80211_wq, &rdev->event_work); 1368 } 1369 EXPORT_SYMBOL(cfg80211_stop_iface); 1370 1371 void cfg80211_init_wdev(struct wireless_dev *wdev) 1372 { 1373 mutex_init(&wdev->mtx); 1374 INIT_LIST_HEAD(&wdev->event_list); 1375 spin_lock_init(&wdev->event_lock); 1376 INIT_LIST_HEAD(&wdev->mgmt_registrations); 1377 INIT_LIST_HEAD(&wdev->pmsr_list); 1378 spin_lock_init(&wdev->pmsr_lock); 1379 INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk); 1380 1381 #ifdef CONFIG_CFG80211_WEXT 1382 wdev->wext.default_key = -1; 1383 wdev->wext.default_mgmt_key = -1; 1384 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; 1385 #endif 1386 1387 wiphy_work_init(&wdev->cqm_rssi_work, cfg80211_cqm_rssi_notify_work); 1388 1389 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) 1390 wdev->ps = true; 1391 else 1392 wdev->ps = false; 1393 /* allow mac80211 to determine the timeout */ 1394 wdev->ps_timeout = -1; 1395 1396 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1397 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || 1398 wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) 1399 wdev->netdev->priv_flags |= IFF_DONT_BRIDGE; 1400 1401 INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk); 1402 } 1403 1404 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev, 1405 struct wireless_dev *wdev) 1406 { 1407 ASSERT_RTNL(); 1408 lockdep_assert_held(&rdev->wiphy.mtx); 1409 1410 /* 1411 * We get here also when the interface changes network namespaces, 1412 * as it's registered into the new one, but we don't want it to 1413 * change ID in that case. Checking if the ID is already assigned 1414 * works, because 0 isn't considered a valid ID and the memory is 1415 * 0-initialized. 1416 */ 1417 if (!wdev->identifier) 1418 wdev->identifier = ++rdev->wdev_id; 1419 list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list); 1420 rdev->devlist_generation++; 1421 wdev->registered = true; 1422 1423 if (wdev->netdev && 1424 sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj, 1425 "phy80211")) 1426 pr_err("failed to add phy80211 symlink to netdev!\n"); 1427 1428 nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); 1429 } 1430 1431 int cfg80211_register_netdevice(struct net_device *dev) 1432 { 1433 struct wireless_dev *wdev = dev->ieee80211_ptr; 1434 struct cfg80211_registered_device *rdev; 1435 int ret; 1436 1437 ASSERT_RTNL(); 1438 1439 if (WARN_ON(!wdev)) 1440 return -EINVAL; 1441 1442 rdev = wiphy_to_rdev(wdev->wiphy); 1443 1444 lockdep_assert_held(&rdev->wiphy.mtx); 1445 1446 /* we'll take care of this */ 1447 wdev->registered = true; 1448 wdev->registering = true; 1449 ret = register_netdevice(dev); 1450 if (ret) 1451 goto out; 1452 1453 cfg80211_register_wdev(rdev, wdev); 1454 ret = 0; 1455 out: 1456 wdev->registering = false; 1457 if (ret) 1458 wdev->registered = false; 1459 return ret; 1460 } 1461 EXPORT_SYMBOL(cfg80211_register_netdevice); 1462 1463 static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 1464 unsigned long state, void *ptr) 1465 { 1466 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1467 struct wireless_dev *wdev = dev->ieee80211_ptr; 1468 struct cfg80211_registered_device *rdev; 1469 struct cfg80211_sched_scan_request *pos, *tmp; 1470 1471 if (!wdev) 1472 return NOTIFY_DONE; 1473 1474 rdev = wiphy_to_rdev(wdev->wiphy); 1475 1476 WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); 1477 1478 switch (state) { 1479 case NETDEV_POST_INIT: 1480 SET_NETDEV_DEVTYPE(dev, &wiphy_type); 1481 wdev->netdev = dev; 1482 /* can only change netns with wiphy */ 1483 dev->features |= NETIF_F_NETNS_LOCAL; 1484 1485 cfg80211_init_wdev(wdev); 1486 break; 1487 case NETDEV_REGISTER: 1488 if (!wdev->registered) { 1489 wiphy_lock(&rdev->wiphy); 1490 cfg80211_register_wdev(rdev, wdev); 1491 wiphy_unlock(&rdev->wiphy); 1492 } 1493 break; 1494 case NETDEV_UNREGISTER: 1495 /* 1496 * It is possible to get NETDEV_UNREGISTER multiple times, 1497 * so check wdev->registered. 1498 */ 1499 if (wdev->registered && !wdev->registering) { 1500 wiphy_lock(&rdev->wiphy); 1501 _cfg80211_unregister_wdev(wdev, false); 1502 wiphy_unlock(&rdev->wiphy); 1503 } 1504 break; 1505 case NETDEV_GOING_DOWN: 1506 wiphy_lock(&rdev->wiphy); 1507 cfg80211_leave(rdev, wdev); 1508 cfg80211_remove_links(wdev); 1509 wiphy_unlock(&rdev->wiphy); 1510 /* since we just did cfg80211_leave() nothing to do there */ 1511 cancel_work_sync(&wdev->disconnect_wk); 1512 cancel_work_sync(&wdev->pmsr_free_wk); 1513 break; 1514 case NETDEV_DOWN: 1515 wiphy_lock(&rdev->wiphy); 1516 cfg80211_update_iface_num(rdev, wdev->iftype, -1); 1517 if (rdev->scan_req && rdev->scan_req->wdev == wdev) { 1518 if (WARN_ON(!rdev->scan_req->notified && 1519 (!rdev->int_scan_req || 1520 !rdev->int_scan_req->notified))) 1521 rdev->scan_req->info.aborted = true; 1522 ___cfg80211_scan_done(rdev, false); 1523 } 1524 1525 list_for_each_entry_safe(pos, tmp, 1526 &rdev->sched_scan_req_list, list) { 1527 if (WARN_ON(pos->dev == wdev->netdev)) 1528 cfg80211_stop_sched_scan_req(rdev, pos, false); 1529 } 1530 1531 rdev->opencount--; 1532 wiphy_unlock(&rdev->wiphy); 1533 wake_up(&rdev->dev_wait); 1534 break; 1535 case NETDEV_UP: 1536 wiphy_lock(&rdev->wiphy); 1537 cfg80211_update_iface_num(rdev, wdev->iftype, 1); 1538 wdev_lock(wdev); 1539 switch (wdev->iftype) { 1540 #ifdef CONFIG_CFG80211_WEXT 1541 case NL80211_IFTYPE_ADHOC: 1542 cfg80211_ibss_wext_join(rdev, wdev); 1543 break; 1544 case NL80211_IFTYPE_STATION: 1545 cfg80211_mgd_wext_connect(rdev, wdev); 1546 break; 1547 #endif 1548 #ifdef CONFIG_MAC80211_MESH 1549 case NL80211_IFTYPE_MESH_POINT: 1550 { 1551 /* backward compat code... */ 1552 struct mesh_setup setup; 1553 memcpy(&setup, &default_mesh_setup, 1554 sizeof(setup)); 1555 /* back compat only needed for mesh_id */ 1556 setup.mesh_id = wdev->u.mesh.id; 1557 setup.mesh_id_len = wdev->u.mesh.id_up_len; 1558 if (wdev->u.mesh.id_up_len) 1559 __cfg80211_join_mesh(rdev, dev, 1560 &setup, 1561 &default_mesh_config); 1562 break; 1563 } 1564 #endif 1565 default: 1566 break; 1567 } 1568 wdev_unlock(wdev); 1569 rdev->opencount++; 1570 1571 /* 1572 * Configure power management to the driver here so that its 1573 * correctly set also after interface type changes etc. 1574 */ 1575 if ((wdev->iftype == NL80211_IFTYPE_STATION || 1576 wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && 1577 rdev->ops->set_power_mgmt && 1578 rdev_set_power_mgmt(rdev, dev, wdev->ps, 1579 wdev->ps_timeout)) { 1580 /* assume this means it's off */ 1581 wdev->ps = false; 1582 } 1583 wiphy_unlock(&rdev->wiphy); 1584 break; 1585 case NETDEV_PRE_UP: 1586 if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype, 1587 wdev->use_4addr, 0)) 1588 return notifier_from_errno(-EOPNOTSUPP); 1589 1590 if (rfkill_blocked(rdev->wiphy.rfkill)) 1591 return notifier_from_errno(-ERFKILL); 1592 break; 1593 default: 1594 return NOTIFY_DONE; 1595 } 1596 1597 wireless_nlevent_flush(); 1598 1599 return NOTIFY_OK; 1600 } 1601 1602 static struct notifier_block cfg80211_netdev_notifier = { 1603 .notifier_call = cfg80211_netdev_notifier_call, 1604 }; 1605 1606 static void __net_exit cfg80211_pernet_exit(struct net *net) 1607 { 1608 struct cfg80211_registered_device *rdev; 1609 1610 rtnl_lock(); 1611 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 1612 if (net_eq(wiphy_net(&rdev->wiphy), net)) 1613 WARN_ON(cfg80211_switch_netns(rdev, &init_net)); 1614 } 1615 rtnl_unlock(); 1616 } 1617 1618 static struct pernet_operations cfg80211_pernet_ops = { 1619 .exit = cfg80211_pernet_exit, 1620 }; 1621 1622 void wiphy_work_queue(struct wiphy *wiphy, struct wiphy_work *work) 1623 { 1624 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1625 unsigned long flags; 1626 1627 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1628 if (list_empty(&work->entry)) 1629 list_add_tail(&work->entry, &rdev->wiphy_work_list); 1630 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1631 1632 queue_work(system_unbound_wq, &rdev->wiphy_work); 1633 } 1634 EXPORT_SYMBOL_GPL(wiphy_work_queue); 1635 1636 void wiphy_work_cancel(struct wiphy *wiphy, struct wiphy_work *work) 1637 { 1638 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1639 unsigned long flags; 1640 1641 lockdep_assert_held(&wiphy->mtx); 1642 1643 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1644 if (!list_empty(&work->entry)) 1645 list_del_init(&work->entry); 1646 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1647 } 1648 EXPORT_SYMBOL_GPL(wiphy_work_cancel); 1649 1650 void wiphy_work_flush(struct wiphy *wiphy, struct wiphy_work *work) 1651 { 1652 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1653 unsigned long flags; 1654 bool run; 1655 1656 spin_lock_irqsave(&rdev->wiphy_work_lock, flags); 1657 run = !work || !list_empty(&work->entry); 1658 spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); 1659 1660 if (run) 1661 cfg80211_process_wiphy_works(rdev, work); 1662 } 1663 EXPORT_SYMBOL_GPL(wiphy_work_flush); 1664 1665 void wiphy_delayed_work_timer(struct timer_list *t) 1666 { 1667 struct wiphy_delayed_work *dwork = from_timer(dwork, t, timer); 1668 1669 wiphy_work_queue(dwork->wiphy, &dwork->work); 1670 } 1671 EXPORT_SYMBOL(wiphy_delayed_work_timer); 1672 1673 void wiphy_delayed_work_queue(struct wiphy *wiphy, 1674 struct wiphy_delayed_work *dwork, 1675 unsigned long delay) 1676 { 1677 if (!delay) { 1678 del_timer(&dwork->timer); 1679 wiphy_work_queue(wiphy, &dwork->work); 1680 return; 1681 } 1682 1683 dwork->wiphy = wiphy; 1684 mod_timer(&dwork->timer, jiffies + delay); 1685 } 1686 EXPORT_SYMBOL_GPL(wiphy_delayed_work_queue); 1687 1688 void wiphy_delayed_work_cancel(struct wiphy *wiphy, 1689 struct wiphy_delayed_work *dwork) 1690 { 1691 lockdep_assert_held(&wiphy->mtx); 1692 1693 del_timer_sync(&dwork->timer); 1694 wiphy_work_cancel(wiphy, &dwork->work); 1695 } 1696 EXPORT_SYMBOL_GPL(wiphy_delayed_work_cancel); 1697 1698 void wiphy_delayed_work_flush(struct wiphy *wiphy, 1699 struct wiphy_delayed_work *dwork) 1700 { 1701 lockdep_assert_held(&wiphy->mtx); 1702 1703 del_timer_sync(&dwork->timer); 1704 wiphy_work_flush(wiphy, &dwork->work); 1705 } 1706 EXPORT_SYMBOL_GPL(wiphy_delayed_work_flush); 1707 1708 static int __init cfg80211_init(void) 1709 { 1710 int err; 1711 1712 err = register_pernet_device(&cfg80211_pernet_ops); 1713 if (err) 1714 goto out_fail_pernet; 1715 1716 err = wiphy_sysfs_init(); 1717 if (err) 1718 goto out_fail_sysfs; 1719 1720 err = register_netdevice_notifier(&cfg80211_netdev_notifier); 1721 if (err) 1722 goto out_fail_notifier; 1723 1724 err = nl80211_init(); 1725 if (err) 1726 goto out_fail_nl80211; 1727 1728 ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); 1729 1730 err = regulatory_init(); 1731 if (err) 1732 goto out_fail_reg; 1733 1734 cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM); 1735 if (!cfg80211_wq) { 1736 err = -ENOMEM; 1737 goto out_fail_wq; 1738 } 1739 1740 return 0; 1741 1742 out_fail_wq: 1743 regulatory_exit(); 1744 out_fail_reg: 1745 debugfs_remove(ieee80211_debugfs_dir); 1746 nl80211_exit(); 1747 out_fail_nl80211: 1748 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1749 out_fail_notifier: 1750 wiphy_sysfs_exit(); 1751 out_fail_sysfs: 1752 unregister_pernet_device(&cfg80211_pernet_ops); 1753 out_fail_pernet: 1754 return err; 1755 } 1756 fs_initcall(cfg80211_init); 1757 1758 static void __exit cfg80211_exit(void) 1759 { 1760 debugfs_remove(ieee80211_debugfs_dir); 1761 nl80211_exit(); 1762 unregister_netdevice_notifier(&cfg80211_netdev_notifier); 1763 wiphy_sysfs_exit(); 1764 regulatory_exit(); 1765 unregister_pernet_device(&cfg80211_pernet_ops); 1766 destroy_workqueue(cfg80211_wq); 1767 } 1768 module_exit(cfg80211_exit); 1769