1/* 2 * Interface handling 3 * 4 * Copyright 2002-2005, Instant802 Networks, Inc. 5 * Copyright 2005-2006, Devicescape Software, Inc. 6 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz> 7 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net> 8 * Copyright 2013-2014 Intel Mobile Communications GmbH 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 as 12 * published by the Free Software Foundation. 13 */ 14#include <linux/slab.h> 15#include <linux/kernel.h> 16#include <linux/if_arp.h> 17#include <linux/netdevice.h> 18#include <linux/rtnetlink.h> 19#include <net/mac80211.h> 20#include <net/ieee80211_radiotap.h> 21#include "ieee80211_i.h" 22#include "sta_info.h" 23#include "debugfs_netdev.h" 24#include "mesh.h" 25#include "led.h" 26#include "driver-ops.h" 27#include "wme.h" 28#include "rate.h" 29 30/** 31 * DOC: Interface list locking 32 * 33 * The interface list in each struct ieee80211_local is protected 34 * three-fold: 35 * 36 * (1) modifications may only be done under the RTNL 37 * (2) modifications and readers are protected against each other by 38 * the iflist_mtx. 39 * (3) modifications are done in an RCU manner so atomic readers 40 * can traverse the list in RCU-safe blocks. 41 * 42 * As a consequence, reads (traversals) of the list can be protected 43 * by either the RTNL, the iflist_mtx or RCU. 44 */ 45 46bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata) 47{ 48 struct ieee80211_chanctx_conf *chanctx_conf; 49 int power; 50 51 rcu_read_lock(); 52 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 53 if (!chanctx_conf) { 54 rcu_read_unlock(); 55 return false; 56 } 57 58 power = ieee80211_chandef_max_power(&chanctx_conf->def); 59 rcu_read_unlock(); 60 61 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL) 62 power = min(power, sdata->user_power_level); 63 64 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL) 65 power = min(power, sdata->ap_power_level); 66 67 if (power != sdata->vif.bss_conf.txpower) { 68 sdata->vif.bss_conf.txpower = power; 69 ieee80211_hw_config(sdata->local, 0); 70 return true; 71 } 72 73 return false; 74} 75 76void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata, 77 bool update_bss) 78{ 79 if (__ieee80211_recalc_txpower(sdata) || update_bss) 80 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER); 81} 82 83static u32 __ieee80211_idle_off(struct ieee80211_local *local) 84{ 85 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) 86 return 0; 87 88 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; 89 return IEEE80211_CONF_CHANGE_IDLE; 90} 91 92static u32 __ieee80211_idle_on(struct ieee80211_local *local) 93{ 94 if (local->hw.conf.flags & IEEE80211_CONF_IDLE) 95 return 0; 96 97 ieee80211_flush_queues(local, NULL, false); 98 99 local->hw.conf.flags |= IEEE80211_CONF_IDLE; 100 return IEEE80211_CONF_CHANGE_IDLE; 101} 102 103static u32 __ieee80211_recalc_idle(struct ieee80211_local *local, 104 bool force_active) 105{ 106 bool working, scanning, active; 107 unsigned int led_trig_start = 0, led_trig_stop = 0; 108 109 lockdep_assert_held(&local->mtx); 110 111 active = force_active || 112 !list_empty(&local->chanctx_list) || 113 local->monitors; 114 115 working = !local->ops->remain_on_channel && 116 !list_empty(&local->roc_list); 117 118 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) || 119 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 120 121 if (working || scanning) 122 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK; 123 else 124 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK; 125 126 if (active) 127 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 128 else 129 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 130 131 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop); 132 133 if (working || scanning || active) 134 return __ieee80211_idle_off(local); 135 return __ieee80211_idle_on(local); 136} 137 138u32 ieee80211_idle_off(struct ieee80211_local *local) 139{ 140 return __ieee80211_recalc_idle(local, true); 141} 142 143void ieee80211_recalc_idle(struct ieee80211_local *local) 144{ 145 u32 change = __ieee80211_recalc_idle(local, false); 146 if (change) 147 ieee80211_hw_config(local, change); 148} 149 150static int ieee80211_change_mtu(struct net_device *dev, int new_mtu) 151{ 152 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN) 153 return -EINVAL; 154 155 dev->mtu = new_mtu; 156 return 0; 157} 158 159static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr, 160 bool check_dup) 161{ 162 struct ieee80211_local *local = sdata->local; 163 struct ieee80211_sub_if_data *iter; 164 u64 new, mask, tmp; 165 u8 *m; 166 int ret = 0; 167 168 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 169 return 0; 170 171 m = addr; 172 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 173 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 174 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 175 176 m = local->hw.wiphy->addr_mask; 177 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 178 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 179 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 180 181 if (!check_dup) 182 return ret; 183 184 mutex_lock(&local->iflist_mtx); 185 list_for_each_entry(iter, &local->interfaces, list) { 186 if (iter == sdata) 187 continue; 188 189 if (iter->vif.type == NL80211_IFTYPE_MONITOR && 190 !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE)) 191 continue; 192 193 m = iter->vif.addr; 194 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 195 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 196 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 197 198 if ((new & ~mask) != (tmp & ~mask)) { 199 ret = -EINVAL; 200 break; 201 } 202 } 203 mutex_unlock(&local->iflist_mtx); 204 205 return ret; 206} 207 208static int ieee80211_change_mac(struct net_device *dev, void *addr) 209{ 210 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 211 struct sockaddr *sa = addr; 212 bool check_dup = true; 213 int ret; 214 215 if (ieee80211_sdata_running(sdata)) 216 return -EBUSY; 217 218 if (sdata->vif.type == NL80211_IFTYPE_MONITOR && 219 !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE)) 220 check_dup = false; 221 222 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup); 223 if (ret) 224 return ret; 225 226 ret = eth_mac_addr(dev, sa); 227 228 if (ret == 0) 229 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); 230 231 return ret; 232} 233 234static inline int identical_mac_addr_allowed(int type1, int type2) 235{ 236 return type1 == NL80211_IFTYPE_MONITOR || 237 type2 == NL80211_IFTYPE_MONITOR || 238 type1 == NL80211_IFTYPE_P2P_DEVICE || 239 type2 == NL80211_IFTYPE_P2P_DEVICE || 240 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) || 241 (type1 == NL80211_IFTYPE_WDS && 242 (type2 == NL80211_IFTYPE_WDS || 243 type2 == NL80211_IFTYPE_AP)) || 244 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 245 (type1 == NL80211_IFTYPE_AP_VLAN && 246 (type2 == NL80211_IFTYPE_AP || 247 type2 == NL80211_IFTYPE_AP_VLAN)); 248} 249 250static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 251 enum nl80211_iftype iftype) 252{ 253 struct ieee80211_local *local = sdata->local; 254 struct ieee80211_sub_if_data *nsdata; 255 int ret; 256 257 ASSERT_RTNL(); 258 259 /* we hold the RTNL here so can safely walk the list */ 260 list_for_each_entry(nsdata, &local->interfaces, list) { 261 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { 262 /* 263 * Only OCB and monitor mode may coexist 264 */ 265 if ((sdata->vif.type == NL80211_IFTYPE_OCB && 266 nsdata->vif.type != NL80211_IFTYPE_MONITOR) || 267 (sdata->vif.type != NL80211_IFTYPE_MONITOR && 268 nsdata->vif.type == NL80211_IFTYPE_OCB)) 269 return -EBUSY; 270 271 /* 272 * Allow only a single IBSS interface to be up at any 273 * time. This is restricted because beacon distribution 274 * cannot work properly if both are in the same IBSS. 275 * 276 * To remove this restriction we'd have to disallow them 277 * from setting the same SSID on different IBSS interfaces 278 * belonging to the same hardware. Then, however, we're 279 * faced with having to adopt two different TSF timers... 280 */ 281 if (iftype == NL80211_IFTYPE_ADHOC && 282 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 283 return -EBUSY; 284 /* 285 * will not add another interface while any channel 286 * switch is active. 287 */ 288 if (nsdata->vif.csa_active) 289 return -EBUSY; 290 291 /* 292 * The remaining checks are only performed for interfaces 293 * with the same MAC address. 294 */ 295 if (!ether_addr_equal(sdata->vif.addr, 296 nsdata->vif.addr)) 297 continue; 298 299 /* 300 * check whether it may have the same address 301 */ 302 if (!identical_mac_addr_allowed(iftype, 303 nsdata->vif.type)) 304 return -ENOTUNIQ; 305 306 /* 307 * can only add VLANs to enabled APs 308 */ 309 if (iftype == NL80211_IFTYPE_AP_VLAN && 310 nsdata->vif.type == NL80211_IFTYPE_AP) 311 sdata->bss = &nsdata->u.ap; 312 } 313 } 314 315 mutex_lock(&local->chanctx_mtx); 316 ret = ieee80211_check_combinations(sdata, NULL, 0, 0); 317 mutex_unlock(&local->chanctx_mtx); 318 return ret; 319} 320 321static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata, 322 enum nl80211_iftype iftype) 323{ 324 int n_queues = sdata->local->hw.queues; 325 int i; 326 327 if (iftype != NL80211_IFTYPE_P2P_DEVICE) { 328 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 329 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 330 IEEE80211_INVAL_HW_QUEUE)) 331 return -EINVAL; 332 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 333 n_queues)) 334 return -EINVAL; 335 } 336 } 337 338 if ((iftype != NL80211_IFTYPE_AP && 339 iftype != NL80211_IFTYPE_P2P_GO && 340 iftype != NL80211_IFTYPE_MESH_POINT) || 341 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) { 342 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 343 return 0; 344 } 345 346 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 347 return -EINVAL; 348 349 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 350 return -EINVAL; 351 352 return 0; 353} 354 355void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 356 const int offset) 357{ 358 struct ieee80211_local *local = sdata->local; 359 u32 flags = sdata->u.mntr_flags; 360 361#define ADJUST(_f, _s) do { \ 362 if (flags & MONITOR_FLAG_##_f) \ 363 local->fif_##_s += offset; \ 364 } while (0) 365 366 ADJUST(FCSFAIL, fcsfail); 367 ADJUST(PLCPFAIL, plcpfail); 368 ADJUST(CONTROL, control); 369 ADJUST(CONTROL, pspoll); 370 ADJUST(OTHER_BSS, other_bss); 371 372#undef ADJUST 373} 374 375static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 376{ 377 struct ieee80211_local *local = sdata->local; 378 int i; 379 380 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 381 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) 382 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 383 else if (local->hw.queues >= IEEE80211_NUM_ACS) 384 sdata->vif.hw_queue[i] = i; 385 else 386 sdata->vif.hw_queue[i] = 0; 387 } 388 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 389} 390 391int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 392{ 393 struct ieee80211_sub_if_data *sdata; 394 int ret; 395 396 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF)) 397 return 0; 398 399 ASSERT_RTNL(); 400 401 if (local->monitor_sdata) 402 return 0; 403 404 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 405 if (!sdata) 406 return -ENOMEM; 407 408 /* set up data */ 409 sdata->local = local; 410 sdata->vif.type = NL80211_IFTYPE_MONITOR; 411 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 412 wiphy_name(local->hw.wiphy)); 413 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; 414 415 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 416 417 ieee80211_set_default_queues(sdata); 418 419 ret = drv_add_interface(local, sdata); 420 if (WARN_ON(ret)) { 421 /* ok .. stupid driver, it asked for this! */ 422 kfree(sdata); 423 return ret; 424 } 425 426 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 427 if (ret) { 428 kfree(sdata); 429 return ret; 430 } 431 432 mutex_lock(&local->iflist_mtx); 433 rcu_assign_pointer(local->monitor_sdata, sdata); 434 mutex_unlock(&local->iflist_mtx); 435 436 mutex_lock(&local->mtx); 437 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef, 438 IEEE80211_CHANCTX_EXCLUSIVE); 439 mutex_unlock(&local->mtx); 440 if (ret) { 441 mutex_lock(&local->iflist_mtx); 442 RCU_INIT_POINTER(local->monitor_sdata, NULL); 443 mutex_unlock(&local->iflist_mtx); 444 synchronize_net(); 445 drv_remove_interface(local, sdata); 446 kfree(sdata); 447 return ret; 448 } 449 450 return 0; 451} 452 453void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 454{ 455 struct ieee80211_sub_if_data *sdata; 456 457 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF)) 458 return; 459 460 ASSERT_RTNL(); 461 462 mutex_lock(&local->iflist_mtx); 463 464 sdata = rcu_dereference_protected(local->monitor_sdata, 465 lockdep_is_held(&local->iflist_mtx)); 466 if (!sdata) { 467 mutex_unlock(&local->iflist_mtx); 468 return; 469 } 470 471 RCU_INIT_POINTER(local->monitor_sdata, NULL); 472 mutex_unlock(&local->iflist_mtx); 473 474 synchronize_net(); 475 476 mutex_lock(&local->mtx); 477 ieee80211_vif_release_channel(sdata); 478 mutex_unlock(&local->mtx); 479 480 drv_remove_interface(local, sdata); 481 482 kfree(sdata); 483} 484 485/* 486 * NOTE: Be very careful when changing this function, it must NOT return 487 * an error on interface type changes that have been pre-checked, so most 488 * checks should be in ieee80211_check_concurrent_iface. 489 */ 490int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 491{ 492 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 493 struct net_device *dev = wdev->netdev; 494 struct ieee80211_local *local = sdata->local; 495 struct sta_info *sta; 496 u32 changed = 0; 497 int res; 498 u32 hw_reconf_flags = 0; 499 500 switch (sdata->vif.type) { 501 case NL80211_IFTYPE_WDS: 502 if (!is_valid_ether_addr(sdata->u.wds.remote_addr)) 503 return -ENOLINK; 504 break; 505 case NL80211_IFTYPE_AP_VLAN: { 506 struct ieee80211_sub_if_data *master; 507 508 if (!sdata->bss) 509 return -ENOLINK; 510 511 mutex_lock(&local->mtx); 512 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 513 mutex_unlock(&local->mtx); 514 515 master = container_of(sdata->bss, 516 struct ieee80211_sub_if_data, u.ap); 517 sdata->control_port_protocol = 518 master->control_port_protocol; 519 sdata->control_port_no_encrypt = 520 master->control_port_no_encrypt; 521 sdata->vif.cab_queue = master->vif.cab_queue; 522 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 523 sizeof(sdata->vif.hw_queue)); 524 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef; 525 526 mutex_lock(&local->key_mtx); 527 sdata->crypto_tx_tailroom_needed_cnt += 528 master->crypto_tx_tailroom_needed_cnt; 529 mutex_unlock(&local->key_mtx); 530 531 break; 532 } 533 case NL80211_IFTYPE_AP: 534 sdata->bss = &sdata->u.ap; 535 break; 536 case NL80211_IFTYPE_MESH_POINT: 537 case NL80211_IFTYPE_STATION: 538 case NL80211_IFTYPE_MONITOR: 539 case NL80211_IFTYPE_ADHOC: 540 case NL80211_IFTYPE_P2P_DEVICE: 541 case NL80211_IFTYPE_OCB: 542 /* no special treatment */ 543 break; 544 case NL80211_IFTYPE_UNSPECIFIED: 545 case NUM_NL80211_IFTYPES: 546 case NL80211_IFTYPE_P2P_CLIENT: 547 case NL80211_IFTYPE_P2P_GO: 548 /* cannot happen */ 549 WARN_ON(1); 550 break; 551 } 552 553 if (local->open_count == 0) { 554 res = drv_start(local); 555 if (res) 556 goto err_del_bss; 557 /* we're brought up, everything changes */ 558 hw_reconf_flags = ~0; 559 ieee80211_led_radio(local, true); 560 ieee80211_mod_tpt_led_trig(local, 561 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 562 } 563 564 /* 565 * Copy the hopefully now-present MAC address to 566 * this interface, if it has the special null one. 567 */ 568 if (dev && is_zero_ether_addr(dev->dev_addr)) { 569 memcpy(dev->dev_addr, 570 local->hw.wiphy->perm_addr, 571 ETH_ALEN); 572 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 573 574 if (!is_valid_ether_addr(dev->dev_addr)) { 575 res = -EADDRNOTAVAIL; 576 goto err_stop; 577 } 578 } 579 580 switch (sdata->vif.type) { 581 case NL80211_IFTYPE_AP_VLAN: 582 /* no need to tell driver, but set carrier and chanctx */ 583 if (rtnl_dereference(sdata->bss->beacon)) { 584 ieee80211_vif_vlan_copy_chanctx(sdata); 585 netif_carrier_on(dev); 586 } else { 587 netif_carrier_off(dev); 588 } 589 break; 590 case NL80211_IFTYPE_MONITOR: 591 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 592 local->cooked_mntrs++; 593 break; 594 } 595 596 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) { 597 res = drv_add_interface(local, sdata); 598 if (res) 599 goto err_stop; 600 } else if (local->monitors == 0 && local->open_count == 0) { 601 res = ieee80211_add_virtual_monitor(local); 602 if (res) 603 goto err_stop; 604 } 605 606 /* must be before the call to ieee80211_configure_filter */ 607 local->monitors++; 608 if (local->monitors == 1) { 609 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 610 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 611 } 612 613 ieee80211_adjust_monitor_flags(sdata, 1); 614 ieee80211_configure_filter(local); 615 mutex_lock(&local->mtx); 616 ieee80211_recalc_idle(local); 617 mutex_unlock(&local->mtx); 618 619 netif_carrier_on(dev); 620 break; 621 default: 622 if (coming_up) { 623 ieee80211_del_virtual_monitor(local); 624 625 res = drv_add_interface(local, sdata); 626 if (res) 627 goto err_stop; 628 res = ieee80211_check_queues(sdata, 629 ieee80211_vif_type_p2p(&sdata->vif)); 630 if (res) 631 goto err_del_interface; 632 } 633 634 if (sdata->vif.type == NL80211_IFTYPE_AP) { 635 local->fif_pspoll++; 636 local->fif_probe_req++; 637 638 ieee80211_configure_filter(local); 639 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 640 local->fif_probe_req++; 641 } 642 643 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 644 changed |= ieee80211_reset_erp_info(sdata); 645 ieee80211_bss_info_change_notify(sdata, changed); 646 647 switch (sdata->vif.type) { 648 case NL80211_IFTYPE_STATION: 649 case NL80211_IFTYPE_ADHOC: 650 case NL80211_IFTYPE_AP: 651 case NL80211_IFTYPE_MESH_POINT: 652 case NL80211_IFTYPE_OCB: 653 netif_carrier_off(dev); 654 break; 655 case NL80211_IFTYPE_WDS: 656 case NL80211_IFTYPE_P2P_DEVICE: 657 break; 658 default: 659 /* not reached */ 660 WARN_ON(1); 661 } 662 663 /* 664 * set default queue parameters so drivers don't 665 * need to initialise the hardware if the hardware 666 * doesn't start up with sane defaults 667 */ 668 ieee80211_set_wmm_default(sdata, true); 669 } 670 671 set_bit(SDATA_STATE_RUNNING, &sdata->state); 672 673 if (sdata->vif.type == NL80211_IFTYPE_WDS) { 674 /* Create STA entry for the WDS peer */ 675 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr, 676 GFP_KERNEL); 677 if (!sta) { 678 res = -ENOMEM; 679 goto err_del_interface; 680 } 681 682 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 683 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 684 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 685 686 res = sta_info_insert(sta); 687 if (res) { 688 /* STA has been freed */ 689 goto err_del_interface; 690 } 691 692 rate_control_rate_init(sta); 693 netif_carrier_on(dev); 694 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 695 rcu_assign_pointer(local->p2p_sdata, sdata); 696 } 697 698 /* 699 * set_multicast_list will be invoked by the networking core 700 * which will check whether any increments here were done in 701 * error and sync them down to the hardware as filter flags. 702 */ 703 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 704 atomic_inc(&local->iff_allmultis); 705 706 if (sdata->flags & IEEE80211_SDATA_PROMISC) 707 atomic_inc(&local->iff_promiscs); 708 709 if (coming_up) 710 local->open_count++; 711 712 if (hw_reconf_flags) 713 ieee80211_hw_config(local, hw_reconf_flags); 714 715 ieee80211_recalc_ps(local, -1); 716 717 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 718 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 719 /* XXX: for AP_VLAN, actually track AP queues */ 720 netif_tx_start_all_queues(dev); 721 } else if (dev) { 722 unsigned long flags; 723 int n_acs = IEEE80211_NUM_ACS; 724 int ac; 725 726 if (local->hw.queues < IEEE80211_NUM_ACS) 727 n_acs = 1; 728 729 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 730 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE || 731 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 && 732 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) { 733 for (ac = 0; ac < n_acs; ac++) { 734 int ac_queue = sdata->vif.hw_queue[ac]; 735 736 if (local->queue_stop_reasons[ac_queue] == 0 && 737 skb_queue_empty(&local->pending[ac_queue])) 738 netif_start_subqueue(dev, ac); 739 } 740 } 741 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 742 } 743 744 return 0; 745 err_del_interface: 746 drv_remove_interface(local, sdata); 747 err_stop: 748 if (!local->open_count) 749 drv_stop(local); 750 err_del_bss: 751 sdata->bss = NULL; 752 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 753 mutex_lock(&local->mtx); 754 list_del(&sdata->u.vlan.list); 755 mutex_unlock(&local->mtx); 756 } 757 /* might already be clear but that doesn't matter */ 758 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 759 return res; 760} 761 762static int ieee80211_open(struct net_device *dev) 763{ 764 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 765 int err; 766 767 /* fail early if user set an invalid address */ 768 if (!is_valid_ether_addr(dev->dev_addr)) 769 return -EADDRNOTAVAIL; 770 771 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 772 if (err) 773 return err; 774 775 return ieee80211_do_open(&sdata->wdev, true); 776} 777 778static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, 779 bool going_down) 780{ 781 struct ieee80211_local *local = sdata->local; 782 unsigned long flags; 783 struct sk_buff *skb, *tmp; 784 u32 hw_reconf_flags = 0; 785 int i, flushed; 786 struct ps_data *ps; 787 struct cfg80211_chan_def chandef; 788 bool cancel_scan; 789 790 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 791 792 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata; 793 if (cancel_scan) 794 ieee80211_scan_cancel(local); 795 796 /* 797 * Stop TX on this interface first. 798 */ 799 if (sdata->dev) 800 netif_tx_stop_all_queues(sdata->dev); 801 802 ieee80211_roc_purge(local, sdata); 803 804 switch (sdata->vif.type) { 805 case NL80211_IFTYPE_STATION: 806 ieee80211_mgd_stop(sdata); 807 break; 808 case NL80211_IFTYPE_ADHOC: 809 ieee80211_ibss_stop(sdata); 810 break; 811 case NL80211_IFTYPE_AP: 812 cancel_work_sync(&sdata->u.ap.request_smps_work); 813 break; 814 default: 815 break; 816 } 817 818 /* 819 * Remove all stations associated with this interface. 820 * 821 * This must be done before calling ops->remove_interface() 822 * because otherwise we can later invoke ops->sta_notify() 823 * whenever the STAs are removed, and that invalidates driver 824 * assumptions about always getting a vif pointer that is valid 825 * (because if we remove a STA after ops->remove_interface() 826 * the driver will have removed the vif info already!) 827 * 828 * In WDS mode a station must exist here and be flushed, for 829 * AP_VLANs stations may exist since there's nothing else that 830 * would have removed them, but in other modes there shouldn't 831 * be any stations. 832 */ 833 flushed = sta_info_flush(sdata); 834 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 835 ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) || 836 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1))); 837 838 /* don't count this interface for promisc/allmulti while it is down */ 839 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 840 atomic_dec(&local->iff_allmultis); 841 842 if (sdata->flags & IEEE80211_SDATA_PROMISC) 843 atomic_dec(&local->iff_promiscs); 844 845 if (sdata->vif.type == NL80211_IFTYPE_AP) { 846 local->fif_pspoll--; 847 local->fif_probe_req--; 848 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 849 local->fif_probe_req--; 850 } 851 852 if (sdata->dev) { 853 netif_addr_lock_bh(sdata->dev); 854 spin_lock_bh(&local->filter_lock); 855 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 856 sdata->dev->addr_len); 857 spin_unlock_bh(&local->filter_lock); 858 netif_addr_unlock_bh(sdata->dev); 859 } 860 861 del_timer_sync(&local->dynamic_ps_timer); 862 cancel_work_sync(&local->dynamic_ps_enable_work); 863 864 cancel_work_sync(&sdata->recalc_smps); 865 sdata_lock(sdata); 866 mutex_lock(&local->mtx); 867 sdata->vif.csa_active = false; 868 if (sdata->vif.type == NL80211_IFTYPE_STATION) 869 sdata->u.mgd.csa_waiting_bcn = false; 870 if (sdata->csa_block_tx) { 871 ieee80211_wake_vif_queues(local, sdata, 872 IEEE80211_QUEUE_STOP_REASON_CSA); 873 sdata->csa_block_tx = false; 874 } 875 mutex_unlock(&local->mtx); 876 sdata_unlock(sdata); 877 878 cancel_work_sync(&sdata->csa_finalize_work); 879 880 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work); 881 882 if (sdata->wdev.cac_started) { 883 chandef = sdata->vif.bss_conf.chandef; 884 WARN_ON(local->suspended); 885 mutex_lock(&local->mtx); 886 ieee80211_vif_release_channel(sdata); 887 mutex_unlock(&local->mtx); 888 cfg80211_cac_event(sdata->dev, &chandef, 889 NL80211_RADAR_CAC_ABORTED, 890 GFP_KERNEL); 891 } 892 893 /* APs need special treatment */ 894 if (sdata->vif.type == NL80211_IFTYPE_AP) { 895 struct ieee80211_sub_if_data *vlan, *tmpsdata; 896 897 /* down all dependent devices, that is VLANs */ 898 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 899 u.vlan.list) 900 dev_close(vlan->dev); 901 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 902 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 903 /* remove all packets in parent bc_buf pointing to this dev */ 904 ps = &sdata->bss->ps; 905 906 spin_lock_irqsave(&ps->bc_buf.lock, flags); 907 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 908 if (skb->dev == sdata->dev) { 909 __skb_unlink(skb, &ps->bc_buf); 910 local->total_ps_buffered--; 911 ieee80211_free_txskb(&local->hw, skb); 912 } 913 } 914 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 915 } 916 917 if (going_down) 918 local->open_count--; 919 920 switch (sdata->vif.type) { 921 case NL80211_IFTYPE_AP_VLAN: 922 mutex_lock(&local->mtx); 923 list_del(&sdata->u.vlan.list); 924 mutex_unlock(&local->mtx); 925 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL); 926 /* see comment in the default case below */ 927 ieee80211_free_keys(sdata, true); 928 /* no need to tell driver */ 929 break; 930 case NL80211_IFTYPE_MONITOR: 931 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 932 local->cooked_mntrs--; 933 break; 934 } 935 936 local->monitors--; 937 if (local->monitors == 0) { 938 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 939 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 940 } 941 942 ieee80211_adjust_monitor_flags(sdata, -1); 943 break; 944 case NL80211_IFTYPE_P2P_DEVICE: 945 /* relies on synchronize_rcu() below */ 946 RCU_INIT_POINTER(local->p2p_sdata, NULL); 947 /* fall through */ 948 default: 949 cancel_work_sync(&sdata->work); 950 /* 951 * When we get here, the interface is marked down. 952 * Free the remaining keys, if there are any 953 * (which can happen in AP mode if userspace sets 954 * keys before the interface is operating, and maybe 955 * also in WDS mode) 956 * 957 * Force the key freeing to always synchronize_net() 958 * to wait for the RX path in case it is using this 959 * interface enqueuing frames at this very time on 960 * another CPU. 961 */ 962 ieee80211_free_keys(sdata, true); 963 skb_queue_purge(&sdata->skb_queue); 964 } 965 966 sdata->bss = NULL; 967 968 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 969 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 970 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 971 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 972 if (info->control.vif == &sdata->vif) { 973 __skb_unlink(skb, &local->pending[i]); 974 ieee80211_free_txskb(&local->hw, skb); 975 } 976 } 977 } 978 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 979 980 if (sdata->vif.txq) { 981 struct txq_info *txqi = to_txq_info(sdata->vif.txq); 982 983 ieee80211_purge_tx_queue(&local->hw, &txqi->queue); 984 atomic_set(&sdata->txqs_len[txqi->txq.ac], 0); 985 } 986 987 if (local->open_count == 0) 988 ieee80211_clear_tx_pending(local); 989 990 /* 991 * If the interface goes down while suspended, presumably because 992 * the device was unplugged and that happens before our resume, 993 * then the driver is already unconfigured and the remainder of 994 * this function isn't needed. 995 * XXX: what about WoWLAN? If the device has software state, e.g. 996 * memory allocated, it might expect teardown commands from 997 * mac80211 here? 998 */ 999 if (local->suspended) { 1000 WARN_ON(local->wowlan); 1001 WARN_ON(rtnl_dereference(local->monitor_sdata)); 1002 return; 1003 } 1004 1005 switch (sdata->vif.type) { 1006 case NL80211_IFTYPE_AP_VLAN: 1007 break; 1008 case NL80211_IFTYPE_MONITOR: 1009 if (local->monitors == 0) 1010 ieee80211_del_virtual_monitor(local); 1011 1012 mutex_lock(&local->mtx); 1013 ieee80211_recalc_idle(local); 1014 mutex_unlock(&local->mtx); 1015 1016 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE)) 1017 break; 1018 1019 /* fall through */ 1020 default: 1021 if (going_down) 1022 drv_remove_interface(local, sdata); 1023 } 1024 1025 ieee80211_recalc_ps(local, -1); 1026 1027 if (cancel_scan) 1028 flush_delayed_work(&local->scan_work); 1029 1030 if (local->open_count == 0) { 1031 ieee80211_stop_device(local); 1032 1033 /* no reconfiguring after stop! */ 1034 return; 1035 } 1036 1037 /* do after stop to avoid reconfiguring when we stop anyway */ 1038 ieee80211_configure_filter(local); 1039 ieee80211_hw_config(local, hw_reconf_flags); 1040 1041 if (local->monitors == local->open_count) 1042 ieee80211_add_virtual_monitor(local); 1043} 1044 1045static int ieee80211_stop(struct net_device *dev) 1046{ 1047 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1048 1049 ieee80211_do_stop(sdata, true); 1050 1051 return 0; 1052} 1053 1054static void ieee80211_set_multicast_list(struct net_device *dev) 1055{ 1056 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1057 struct ieee80211_local *local = sdata->local; 1058 int allmulti, promisc, sdata_allmulti, sdata_promisc; 1059 1060 allmulti = !!(dev->flags & IFF_ALLMULTI); 1061 promisc = !!(dev->flags & IFF_PROMISC); 1062 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 1063 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC); 1064 1065 if (allmulti != sdata_allmulti) { 1066 if (dev->flags & IFF_ALLMULTI) 1067 atomic_inc(&local->iff_allmultis); 1068 else 1069 atomic_dec(&local->iff_allmultis); 1070 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 1071 } 1072 1073 if (promisc != sdata_promisc) { 1074 if (dev->flags & IFF_PROMISC) 1075 atomic_inc(&local->iff_promiscs); 1076 else 1077 atomic_dec(&local->iff_promiscs); 1078 sdata->flags ^= IEEE80211_SDATA_PROMISC; 1079 } 1080 spin_lock_bh(&local->filter_lock); 1081 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 1082 spin_unlock_bh(&local->filter_lock); 1083 ieee80211_queue_work(&local->hw, &local->reconfig_filter); 1084} 1085 1086/* 1087 * Called when the netdev is removed or, by the code below, before 1088 * the interface type changes. 1089 */ 1090static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 1091{ 1092 int i; 1093 1094 /* free extra data */ 1095 ieee80211_free_keys(sdata, false); 1096 1097 ieee80211_debugfs_remove_netdev(sdata); 1098 1099 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1100 __skb_queue_purge(&sdata->fragments[i].skb_list); 1101 sdata->fragment_next = 0; 1102 1103 if (ieee80211_vif_is_mesh(&sdata->vif)) 1104 mesh_rmc_free(sdata); 1105} 1106 1107static void ieee80211_uninit(struct net_device *dev) 1108{ 1109 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 1110} 1111 1112static u16 ieee80211_netdev_select_queue(struct net_device *dev, 1113 struct sk_buff *skb, 1114 void *accel_priv, 1115 select_queue_fallback_t fallback) 1116{ 1117 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb); 1118} 1119 1120static const struct net_device_ops ieee80211_dataif_ops = { 1121 .ndo_open = ieee80211_open, 1122 .ndo_stop = ieee80211_stop, 1123 .ndo_uninit = ieee80211_uninit, 1124 .ndo_start_xmit = ieee80211_subif_start_xmit, 1125 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1126 .ndo_change_mtu = ieee80211_change_mtu, 1127 .ndo_set_mac_address = ieee80211_change_mac, 1128 .ndo_select_queue = ieee80211_netdev_select_queue, 1129}; 1130 1131static u16 ieee80211_monitor_select_queue(struct net_device *dev, 1132 struct sk_buff *skb, 1133 void *accel_priv, 1134 select_queue_fallback_t fallback) 1135{ 1136 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1137 struct ieee80211_local *local = sdata->local; 1138 struct ieee80211_hdr *hdr; 1139 struct ieee80211_radiotap_header *rtap = (void *)skb->data; 1140 1141 if (local->hw.queues < IEEE80211_NUM_ACS) 1142 return 0; 1143 1144 if (skb->len < 4 || 1145 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */) 1146 return 0; /* doesn't matter, frame will be dropped */ 1147 1148 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len)); 1149 1150 return ieee80211_select_queue_80211(sdata, skb, hdr); 1151} 1152 1153static const struct net_device_ops ieee80211_monitorif_ops = { 1154 .ndo_open = ieee80211_open, 1155 .ndo_stop = ieee80211_stop, 1156 .ndo_uninit = ieee80211_uninit, 1157 .ndo_start_xmit = ieee80211_monitor_start_xmit, 1158 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1159 .ndo_change_mtu = ieee80211_change_mtu, 1160 .ndo_set_mac_address = ieee80211_change_mac, 1161 .ndo_select_queue = ieee80211_monitor_select_queue, 1162}; 1163 1164static void ieee80211_if_setup(struct net_device *dev) 1165{ 1166 ether_setup(dev); 1167 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1168 dev->netdev_ops = &ieee80211_dataif_ops; 1169 dev->destructor = free_netdev; 1170} 1171 1172static void ieee80211_iface_work(struct work_struct *work) 1173{ 1174 struct ieee80211_sub_if_data *sdata = 1175 container_of(work, struct ieee80211_sub_if_data, work); 1176 struct ieee80211_local *local = sdata->local; 1177 struct sk_buff *skb; 1178 struct sta_info *sta; 1179 struct ieee80211_ra_tid *ra_tid; 1180 struct ieee80211_rx_agg *rx_agg; 1181 1182 if (!ieee80211_sdata_running(sdata)) 1183 return; 1184 1185 if (local->scanning) 1186 return; 1187 1188 if (!ieee80211_can_run_worker(local)) 1189 return; 1190 1191 /* first process frames */ 1192 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1193 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1194 1195 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) { 1196 ra_tid = (void *)&skb->cb; 1197 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra, 1198 ra_tid->tid); 1199 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) { 1200 ra_tid = (void *)&skb->cb; 1201 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra, 1202 ra_tid->tid); 1203 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) { 1204 rx_agg = (void *)&skb->cb; 1205 mutex_lock(&local->sta_mtx); 1206 sta = sta_info_get_bss(sdata, rx_agg->addr); 1207 if (sta) 1208 __ieee80211_start_rx_ba_session(sta, 1209 0, 0, 0, 1, rx_agg->tid, 1210 IEEE80211_MAX_AMPDU_BUF, 1211 false, true); 1212 mutex_unlock(&local->sta_mtx); 1213 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) { 1214 rx_agg = (void *)&skb->cb; 1215 mutex_lock(&local->sta_mtx); 1216 sta = sta_info_get_bss(sdata, rx_agg->addr); 1217 if (sta) 1218 __ieee80211_stop_rx_ba_session(sta, 1219 rx_agg->tid, 1220 WLAN_BACK_RECIPIENT, 0, 1221 false); 1222 mutex_unlock(&local->sta_mtx); 1223 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_TDLS_CHSW) { 1224 ieee80211_process_tdls_channel_switch(sdata, skb); 1225 } else if (ieee80211_is_action(mgmt->frame_control) && 1226 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1227 int len = skb->len; 1228 1229 mutex_lock(&local->sta_mtx); 1230 sta = sta_info_get_bss(sdata, mgmt->sa); 1231 if (sta) { 1232 switch (mgmt->u.action.u.addba_req.action_code) { 1233 case WLAN_ACTION_ADDBA_REQ: 1234 ieee80211_process_addba_request( 1235 local, sta, mgmt, len); 1236 break; 1237 case WLAN_ACTION_ADDBA_RESP: 1238 ieee80211_process_addba_resp(local, sta, 1239 mgmt, len); 1240 break; 1241 case WLAN_ACTION_DELBA: 1242 ieee80211_process_delba(sdata, sta, 1243 mgmt, len); 1244 break; 1245 default: 1246 WARN_ON(1); 1247 break; 1248 } 1249 } 1250 mutex_unlock(&local->sta_mtx); 1251 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1252 struct ieee80211_hdr *hdr = (void *)mgmt; 1253 /* 1254 * So the frame isn't mgmt, but frame_control 1255 * is at the right place anyway, of course, so 1256 * the if statement is correct. 1257 * 1258 * Warn if we have other data frame types here, 1259 * they must not get here. 1260 */ 1261 WARN_ON(hdr->frame_control & 1262 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1263 WARN_ON(!(hdr->seq_ctrl & 1264 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1265 /* 1266 * This was a fragment of a frame, received while 1267 * a block-ack session was active. That cannot be 1268 * right, so terminate the session. 1269 */ 1270 mutex_lock(&local->sta_mtx); 1271 sta = sta_info_get_bss(sdata, mgmt->sa); 1272 if (sta) { 1273 u16 tid = *ieee80211_get_qos_ctl(hdr) & 1274 IEEE80211_QOS_CTL_TID_MASK; 1275 1276 __ieee80211_stop_rx_ba_session( 1277 sta, tid, WLAN_BACK_RECIPIENT, 1278 WLAN_REASON_QSTA_REQUIRE_SETUP, 1279 true); 1280 } 1281 mutex_unlock(&local->sta_mtx); 1282 } else switch (sdata->vif.type) { 1283 case NL80211_IFTYPE_STATION: 1284 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1285 break; 1286 case NL80211_IFTYPE_ADHOC: 1287 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1288 break; 1289 case NL80211_IFTYPE_MESH_POINT: 1290 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1291 break; 1292 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1293 break; 1294 default: 1295 WARN(1, "frame for unexpected interface type"); 1296 break; 1297 } 1298 1299 kfree_skb(skb); 1300 } 1301 1302 /* then other type-dependent work */ 1303 switch (sdata->vif.type) { 1304 case NL80211_IFTYPE_STATION: 1305 ieee80211_sta_work(sdata); 1306 break; 1307 case NL80211_IFTYPE_ADHOC: 1308 ieee80211_ibss_work(sdata); 1309 break; 1310 case NL80211_IFTYPE_MESH_POINT: 1311 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1312 break; 1313 ieee80211_mesh_work(sdata); 1314 break; 1315 case NL80211_IFTYPE_OCB: 1316 ieee80211_ocb_work(sdata); 1317 break; 1318 default: 1319 break; 1320 } 1321} 1322 1323static void ieee80211_recalc_smps_work(struct work_struct *work) 1324{ 1325 struct ieee80211_sub_if_data *sdata = 1326 container_of(work, struct ieee80211_sub_if_data, recalc_smps); 1327 1328 ieee80211_recalc_smps(sdata); 1329} 1330 1331/* 1332 * Helper function to initialise an interface to a specific type. 1333 */ 1334static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1335 enum nl80211_iftype type) 1336{ 1337 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff, 1338 0xff, 0xff, 0xff}; 1339 1340 /* clear type-dependent union */ 1341 memset(&sdata->u, 0, sizeof(sdata->u)); 1342 1343 /* and set some type-dependent values */ 1344 sdata->vif.type = type; 1345 sdata->vif.p2p = false; 1346 sdata->wdev.iftype = type; 1347 1348 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1349 sdata->control_port_no_encrypt = false; 1350 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1351 sdata->vif.bss_conf.idle = true; 1352 1353 sdata->noack_map = 0; 1354 1355 /* only monitor/p2p-device differ */ 1356 if (sdata->dev) { 1357 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1358 sdata->dev->type = ARPHRD_ETHER; 1359 } 1360 1361 skb_queue_head_init(&sdata->skb_queue); 1362 INIT_WORK(&sdata->work, ieee80211_iface_work); 1363 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work); 1364 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work); 1365 INIT_LIST_HEAD(&sdata->assigned_chanctx_list); 1366 INIT_LIST_HEAD(&sdata->reserved_chanctx_list); 1367 1368 switch (type) { 1369 case NL80211_IFTYPE_P2P_GO: 1370 type = NL80211_IFTYPE_AP; 1371 sdata->vif.type = type; 1372 sdata->vif.p2p = true; 1373 /* fall through */ 1374 case NL80211_IFTYPE_AP: 1375 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1376 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1377 INIT_WORK(&sdata->u.ap.request_smps_work, 1378 ieee80211_request_smps_ap_work); 1379 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1380 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF; 1381 break; 1382 case NL80211_IFTYPE_P2P_CLIENT: 1383 type = NL80211_IFTYPE_STATION; 1384 sdata->vif.type = type; 1385 sdata->vif.p2p = true; 1386 /* fall through */ 1387 case NL80211_IFTYPE_STATION: 1388 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 1389 ieee80211_sta_setup_sdata(sdata); 1390 break; 1391 case NL80211_IFTYPE_OCB: 1392 sdata->vif.bss_conf.bssid = bssid_wildcard; 1393 ieee80211_ocb_setup_sdata(sdata); 1394 break; 1395 case NL80211_IFTYPE_ADHOC: 1396 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1397 ieee80211_ibss_setup_sdata(sdata); 1398 break; 1399 case NL80211_IFTYPE_MESH_POINT: 1400 if (ieee80211_vif_is_mesh(&sdata->vif)) 1401 ieee80211_mesh_init_sdata(sdata); 1402 break; 1403 case NL80211_IFTYPE_MONITOR: 1404 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1405 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1406 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL | 1407 MONITOR_FLAG_OTHER_BSS; 1408 break; 1409 case NL80211_IFTYPE_WDS: 1410 sdata->vif.bss_conf.bssid = NULL; 1411 break; 1412 case NL80211_IFTYPE_AP_VLAN: 1413 case NL80211_IFTYPE_P2P_DEVICE: 1414 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1415 break; 1416 case NL80211_IFTYPE_UNSPECIFIED: 1417 case NUM_NL80211_IFTYPES: 1418 BUG(); 1419 break; 1420 } 1421 1422 ieee80211_debugfs_add_netdev(sdata); 1423} 1424 1425static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1426 enum nl80211_iftype type) 1427{ 1428 struct ieee80211_local *local = sdata->local; 1429 int ret, err; 1430 enum nl80211_iftype internal_type = type; 1431 bool p2p = false; 1432 1433 ASSERT_RTNL(); 1434 1435 if (!local->ops->change_interface) 1436 return -EBUSY; 1437 1438 switch (sdata->vif.type) { 1439 case NL80211_IFTYPE_AP: 1440 case NL80211_IFTYPE_STATION: 1441 case NL80211_IFTYPE_ADHOC: 1442 case NL80211_IFTYPE_OCB: 1443 /* 1444 * Could maybe also all others here? 1445 * Just not sure how that interacts 1446 * with the RX/config path e.g. for 1447 * mesh. 1448 */ 1449 break; 1450 default: 1451 return -EBUSY; 1452 } 1453 1454 switch (type) { 1455 case NL80211_IFTYPE_AP: 1456 case NL80211_IFTYPE_STATION: 1457 case NL80211_IFTYPE_ADHOC: 1458 case NL80211_IFTYPE_OCB: 1459 /* 1460 * Could probably support everything 1461 * but WDS here (WDS do_open can fail 1462 * under memory pressure, which this 1463 * code isn't prepared to handle). 1464 */ 1465 break; 1466 case NL80211_IFTYPE_P2P_CLIENT: 1467 p2p = true; 1468 internal_type = NL80211_IFTYPE_STATION; 1469 break; 1470 case NL80211_IFTYPE_P2P_GO: 1471 p2p = true; 1472 internal_type = NL80211_IFTYPE_AP; 1473 break; 1474 default: 1475 return -EBUSY; 1476 } 1477 1478 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1479 if (ret) 1480 return ret; 1481 1482 ieee80211_do_stop(sdata, false); 1483 1484 ieee80211_teardown_sdata(sdata); 1485 1486 ret = drv_change_interface(local, sdata, internal_type, p2p); 1487 if (ret) 1488 type = ieee80211_vif_type_p2p(&sdata->vif); 1489 1490 /* 1491 * Ignore return value here, there's not much we can do since 1492 * the driver changed the interface type internally already. 1493 * The warnings will hopefully make driver authors fix it :-) 1494 */ 1495 ieee80211_check_queues(sdata, type); 1496 1497 ieee80211_setup_sdata(sdata, type); 1498 1499 err = ieee80211_do_open(&sdata->wdev, false); 1500 WARN(err, "type change: do_open returned %d", err); 1501 1502 return ret; 1503} 1504 1505int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1506 enum nl80211_iftype type) 1507{ 1508 int ret; 1509 1510 ASSERT_RTNL(); 1511 1512 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1513 return 0; 1514 1515 if (ieee80211_sdata_running(sdata)) { 1516 ret = ieee80211_runtime_change_iftype(sdata, type); 1517 if (ret) 1518 return ret; 1519 } else { 1520 /* Purge and reset type-dependent state. */ 1521 ieee80211_teardown_sdata(sdata); 1522 ieee80211_setup_sdata(sdata, type); 1523 } 1524 1525 /* reset some values that shouldn't be kept across type changes */ 1526 if (type == NL80211_IFTYPE_STATION) 1527 sdata->u.mgd.use_4addr = false; 1528 1529 return 0; 1530} 1531 1532static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1533 u8 *perm_addr, enum nl80211_iftype type) 1534{ 1535 struct ieee80211_sub_if_data *sdata; 1536 u64 mask, start, addr, val, inc; 1537 u8 *m; 1538 u8 tmp_addr[ETH_ALEN]; 1539 int i; 1540 1541 /* default ... something at least */ 1542 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1543 1544 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1545 local->hw.wiphy->n_addresses <= 1) 1546 return; 1547 1548 mutex_lock(&local->iflist_mtx); 1549 1550 switch (type) { 1551 case NL80211_IFTYPE_MONITOR: 1552 /* doesn't matter */ 1553 break; 1554 case NL80211_IFTYPE_WDS: 1555 case NL80211_IFTYPE_AP_VLAN: 1556 /* match up with an AP interface */ 1557 list_for_each_entry(sdata, &local->interfaces, list) { 1558 if (sdata->vif.type != NL80211_IFTYPE_AP) 1559 continue; 1560 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1561 break; 1562 } 1563 /* keep default if no AP interface present */ 1564 break; 1565 case NL80211_IFTYPE_P2P_CLIENT: 1566 case NL80211_IFTYPE_P2P_GO: 1567 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) { 1568 list_for_each_entry(sdata, &local->interfaces, list) { 1569 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1570 continue; 1571 if (!ieee80211_sdata_running(sdata)) 1572 continue; 1573 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1574 goto out_unlock; 1575 } 1576 } 1577 /* otherwise fall through */ 1578 default: 1579 /* assign a new address if possible -- try n_addresses first */ 1580 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1581 bool used = false; 1582 1583 list_for_each_entry(sdata, &local->interfaces, list) { 1584 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1585 sdata->vif.addr)) { 1586 used = true; 1587 break; 1588 } 1589 } 1590 1591 if (!used) { 1592 memcpy(perm_addr, 1593 local->hw.wiphy->addresses[i].addr, 1594 ETH_ALEN); 1595 break; 1596 } 1597 } 1598 1599 /* try mask if available */ 1600 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1601 break; 1602 1603 m = local->hw.wiphy->addr_mask; 1604 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1605 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1606 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1607 1608 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1609 /* not a contiguous mask ... not handled now! */ 1610 pr_info("not contiguous\n"); 1611 break; 1612 } 1613 1614 /* 1615 * Pick address of existing interface in case user changed 1616 * MAC address manually, default to perm_addr. 1617 */ 1618 m = local->hw.wiphy->perm_addr; 1619 list_for_each_entry(sdata, &local->interfaces, list) { 1620 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1621 continue; 1622 m = sdata->vif.addr; 1623 break; 1624 } 1625 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1626 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1627 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1628 1629 inc = 1ULL<<__ffs64(mask); 1630 val = (start & mask); 1631 addr = (start & ~mask) | (val & mask); 1632 do { 1633 bool used = false; 1634 1635 tmp_addr[5] = addr >> 0*8; 1636 tmp_addr[4] = addr >> 1*8; 1637 tmp_addr[3] = addr >> 2*8; 1638 tmp_addr[2] = addr >> 3*8; 1639 tmp_addr[1] = addr >> 4*8; 1640 tmp_addr[0] = addr >> 5*8; 1641 1642 val += inc; 1643 1644 list_for_each_entry(sdata, &local->interfaces, list) { 1645 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 1646 used = true; 1647 break; 1648 } 1649 } 1650 1651 if (!used) { 1652 memcpy(perm_addr, tmp_addr, ETH_ALEN); 1653 break; 1654 } 1655 addr = (start & ~mask) | (val & mask); 1656 } while (addr != start); 1657 1658 break; 1659 } 1660 1661 out_unlock: 1662 mutex_unlock(&local->iflist_mtx); 1663} 1664 1665int ieee80211_if_add(struct ieee80211_local *local, const char *name, 1666 unsigned char name_assign_type, 1667 struct wireless_dev **new_wdev, enum nl80211_iftype type, 1668 struct vif_params *params) 1669{ 1670 struct net_device *ndev = NULL; 1671 struct ieee80211_sub_if_data *sdata = NULL; 1672 struct txq_info *txqi; 1673 int ret, i; 1674 int txqs = 1; 1675 1676 ASSERT_RTNL(); 1677 1678 if (type == NL80211_IFTYPE_P2P_DEVICE) { 1679 struct wireless_dev *wdev; 1680 1681 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 1682 GFP_KERNEL); 1683 if (!sdata) 1684 return -ENOMEM; 1685 wdev = &sdata->wdev; 1686 1687 sdata->dev = NULL; 1688 strlcpy(sdata->name, name, IFNAMSIZ); 1689 ieee80211_assign_perm_addr(local, wdev->address, type); 1690 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 1691 } else { 1692 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size, 1693 sizeof(void *)); 1694 int txq_size = 0; 1695 1696 if (local->ops->wake_tx_queue) 1697 txq_size += sizeof(struct txq_info) + 1698 local->hw.txq_data_size; 1699 1700 if (local->hw.queues >= IEEE80211_NUM_ACS) 1701 txqs = IEEE80211_NUM_ACS; 1702 1703 ndev = alloc_netdev_mqs(size + txq_size, 1704 name, name_assign_type, 1705 ieee80211_if_setup, txqs, 1); 1706 if (!ndev) 1707 return -ENOMEM; 1708 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 1709 1710 ndev->needed_headroom = local->tx_headroom + 1711 4*6 /* four MAC addresses */ 1712 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 1713 + 6 /* mesh */ 1714 + 8 /* rfc1042/bridge tunnel */ 1715 - ETH_HLEN /* ethernet hard_header_len */ 1716 + IEEE80211_ENCRYPT_HEADROOM; 1717 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 1718 1719 ret = dev_alloc_name(ndev, ndev->name); 1720 if (ret < 0) { 1721 free_netdev(ndev); 1722 return ret; 1723 } 1724 1725 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 1726 if (params && is_valid_ether_addr(params->macaddr)) 1727 memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN); 1728 else 1729 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN); 1730 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 1731 1732 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 1733 sdata = netdev_priv(ndev); 1734 ndev->ieee80211_ptr = &sdata->wdev; 1735 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 1736 memcpy(sdata->name, ndev->name, IFNAMSIZ); 1737 1738 if (txq_size) { 1739 txqi = netdev_priv(ndev) + size; 1740 ieee80211_init_tx_queue(sdata, NULL, txqi, 0); 1741 } 1742 1743 sdata->dev = ndev; 1744 } 1745 1746 /* initialise type-independent data */ 1747 sdata->wdev.wiphy = local->hw.wiphy; 1748 sdata->local = local; 1749 1750 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1751 skb_queue_head_init(&sdata->fragments[i].skb_list); 1752 1753 INIT_LIST_HEAD(&sdata->key_list); 1754 1755 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work, 1756 ieee80211_dfs_cac_timer_work); 1757 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk, 1758 ieee80211_delayed_tailroom_dec); 1759 1760 for (i = 0; i < IEEE80211_NUM_BANDS; i++) { 1761 struct ieee80211_supported_band *sband; 1762 sband = local->hw.wiphy->bands[i]; 1763 sdata->rc_rateidx_mask[i] = 1764 sband ? (1 << sband->n_bitrates) - 1 : 0; 1765 if (sband) 1766 memcpy(sdata->rc_rateidx_mcs_mask[i], 1767 sband->ht_cap.mcs.rx_mask, 1768 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1769 else 1770 memset(sdata->rc_rateidx_mcs_mask[i], 0, 1771 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1772 } 1773 1774 ieee80211_set_default_queues(sdata); 1775 1776 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 1777 sdata->user_power_level = local->user_power_level; 1778 1779 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1780 1781 /* setup type-dependent data */ 1782 ieee80211_setup_sdata(sdata, type); 1783 1784 if (ndev) { 1785 if (params) { 1786 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 1787 if (type == NL80211_IFTYPE_STATION) 1788 sdata->u.mgd.use_4addr = params->use_4addr; 1789 } 1790 1791 ndev->features |= local->hw.netdev_features; 1792 1793 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); 1794 1795 ret = register_netdevice(ndev); 1796 if (ret) { 1797 free_netdev(ndev); 1798 return ret; 1799 } 1800 } 1801 1802 mutex_lock(&local->iflist_mtx); 1803 list_add_tail_rcu(&sdata->list, &local->interfaces); 1804 mutex_unlock(&local->iflist_mtx); 1805 1806 if (new_wdev) 1807 *new_wdev = &sdata->wdev; 1808 1809 return 0; 1810} 1811 1812void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 1813{ 1814 ASSERT_RTNL(); 1815 1816 mutex_lock(&sdata->local->iflist_mtx); 1817 list_del_rcu(&sdata->list); 1818 mutex_unlock(&sdata->local->iflist_mtx); 1819 1820 synchronize_rcu(); 1821 1822 if (sdata->dev) { 1823 unregister_netdevice(sdata->dev); 1824 } else { 1825 cfg80211_unregister_wdev(&sdata->wdev); 1826 kfree(sdata); 1827 } 1828} 1829 1830void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 1831{ 1832 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 1833 return; 1834 ieee80211_do_stop(sdata, true); 1835 ieee80211_teardown_sdata(sdata); 1836} 1837 1838/* 1839 * Remove all interfaces, may only be called at hardware unregistration 1840 * time because it doesn't do RCU-safe list removals. 1841 */ 1842void ieee80211_remove_interfaces(struct ieee80211_local *local) 1843{ 1844 struct ieee80211_sub_if_data *sdata, *tmp; 1845 LIST_HEAD(unreg_list); 1846 LIST_HEAD(wdev_list); 1847 1848 ASSERT_RTNL(); 1849 1850 /* 1851 * Close all AP_VLAN interfaces first, as otherwise they 1852 * might be closed while the AP interface they belong to 1853 * is closed, causing unregister_netdevice_many() to crash. 1854 */ 1855 list_for_each_entry(sdata, &local->interfaces, list) 1856 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1857 dev_close(sdata->dev); 1858 1859 mutex_lock(&local->iflist_mtx); 1860 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 1861 list_del(&sdata->list); 1862 1863 if (sdata->dev) 1864 unregister_netdevice_queue(sdata->dev, &unreg_list); 1865 else 1866 list_add(&sdata->list, &wdev_list); 1867 } 1868 mutex_unlock(&local->iflist_mtx); 1869 unregister_netdevice_many(&unreg_list); 1870 1871 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) { 1872 list_del(&sdata->list); 1873 cfg80211_unregister_wdev(&sdata->wdev); 1874 kfree(sdata); 1875 } 1876} 1877 1878static int netdev_notify(struct notifier_block *nb, 1879 unsigned long state, void *ptr) 1880{ 1881 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1882 struct ieee80211_sub_if_data *sdata; 1883 1884 if (state != NETDEV_CHANGENAME) 1885 return NOTIFY_DONE; 1886 1887 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 1888 return NOTIFY_DONE; 1889 1890 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 1891 return NOTIFY_DONE; 1892 1893 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1894 memcpy(sdata->name, dev->name, IFNAMSIZ); 1895 ieee80211_debugfs_rename_netdev(sdata); 1896 1897 return NOTIFY_OK; 1898} 1899 1900static struct notifier_block mac80211_netdev_notifier = { 1901 .notifier_call = netdev_notify, 1902}; 1903 1904int ieee80211_iface_init(void) 1905{ 1906 return register_netdevice_notifier(&mac80211_netdev_notifier); 1907} 1908 1909void ieee80211_iface_exit(void) 1910{ 1911 unregister_netdevice_notifier(&mac80211_netdev_notifier); 1912} 1913